fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <[email protected]>
  10  *  Andy Adamson   <[email protected]>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "sysfs.h"
  67 #include "nfs4idmap.h"
  68 #include "nfs4session.h"
  69 #include "fscache.h"
  70 #include "nfs42.h"
  71
  72 #include "nfs4trace.h"
  73
  74 #define NFSDBG_FACILITY         NFSDBG_PROC
  75
  76 #define NFS4_BITMASK_SZ         3
  77
  78 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  79 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  80
  81 /* file attributes which can be mapped to nfs attributes */
  82 #define NFS4_VALID_ATTRS (ATTR_MODE \
  83         | ATTR_UID \
  84         | ATTR_GID \
  85         | ATTR_SIZE \
  86         | ATTR_ATIME \
  87         | ATTR_MTIME \
  88         | ATTR_CTIME \
  89         | ATTR_ATIME_SET \
  90         | ATTR_MTIME_SET)
  91
  92 struct nfs4_opendata;
  93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  97                               struct nfs_fattr *fattr, struct inode *inode);
  98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  99                             struct nfs_fattr *fattr, struct iattr *sattr,
 100                             struct nfs_open_context *ctx, struct nfs4_label *ilabel);
 101 #ifdef CONFIG_NFS_V4_1
 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 103                 const struct cred *cred,
 104                 struct nfs4_slot *slot,
 105                 bool is_privileged);
 106 static int nfs41_test_stateid(struct nfs_server *, const nfs4_stateid *,
 107                               const struct cred *);
 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 109                               const struct cred *, bool);
 110 #endif
 111
 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 113 static inline struct nfs4_label *
 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 115         struct iattr *sattr, struct nfs4_label *label)
 116 {
 117         int err;
 118
 119         if (label == NULL)
 120                 return NULL;
 121
 122         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 123                 return NULL;
 124
 125         label->lfs = 0;
 126         label->pi = 0;
 127         label->len = 0;
 128         label->label = NULL;
 129
 130         err = security_dentry_init_security(dentry, sattr->ia_mode,
 131                                 &dentry->d_name, NULL,
 132                                 (void **)&label->label, &label->len);
 133         if (err == 0)
 134                 return label;
 135
 136         return NULL;
 137 }
 138 static inline void
 139 nfs4_label_release_security(struct nfs4_label *label)
 140 {
 141         if (label)
 142                 security_release_secctx(label->label, label->len);
 143 }
 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 145 {
 146         if (label)
 147                 return server->attr_bitmask;
 148
 149         return server->attr_bitmask_nl;
 150 }
 151 #else
 152 static inline struct nfs4_label *
 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 154         struct iattr *sattr, struct nfs4_label *l)
 155 { return NULL; }
 156 static inline void
 157 nfs4_label_release_security(struct nfs4_label *label)
 158 { return; }
 159 static inline u32 *
 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 161 { return server->attr_bitmask; }
 162 #endif
 163
 164 /* Prevent leaks of NFSv4 errors into userland */
 165 static int nfs4_map_errors(int err)
 166 {
 167         if (err >= -1000)
 168                 return err;
 169         switch (err) {
 170         case -NFS4ERR_RESOURCE:
 171         case -NFS4ERR_LAYOUTTRYLATER:
 172         case -NFS4ERR_RECALLCONFLICT:
 173         case -NFS4ERR_RETURNCONFLICT:
 174                 return -EREMOTEIO;
 175         case -NFS4ERR_WRONGSEC:
 176         case -NFS4ERR_WRONG_CRED:
 177                 return -EPERM;
 178         case -NFS4ERR_BADOWNER:
 179         case -NFS4ERR_BADNAME:
 180                 return -EINVAL;
 181         case -NFS4ERR_SHARE_DENIED:
 182                 return -EACCES;
 183         case -NFS4ERR_MINOR_VERS_MISMATCH:
 184                 return -EPROTONOSUPPORT;
 185         case -NFS4ERR_FILE_OPEN:
 186                 return -EBUSY;
 187         case -NFS4ERR_NOT_SAME:
 188                 return -ENOTSYNC;
 189         default:
 190                 dprintk("%s could not handle NFSv4 error %d\n",
 191                                 __func__, -err);
 192                 break;
 193         }
 194         return -EIO;
 195 }
 196
 197 /*
 198  * This is our standard bitmap for GETATTR requests.
 199  */
 200 const u32 nfs4_fattr_bitmap[3] = {
 201         FATTR4_WORD0_TYPE
 202         | FATTR4_WORD0_CHANGE
 203         | FATTR4_WORD0_SIZE
 204         | FATTR4_WORD0_FSID
 205         | FATTR4_WORD0_FILEID,
 206         FATTR4_WORD1_MODE
 207         | FATTR4_WORD1_NUMLINKS
 208         | FATTR4_WORD1_OWNER
 209         | FATTR4_WORD1_OWNER_GROUP
 210         | FATTR4_WORD1_RAWDEV
 211         | FATTR4_WORD1_SPACE_USED
 212         | FATTR4_WORD1_TIME_ACCESS
 213         | FATTR4_WORD1_TIME_METADATA
 214         | FATTR4_WORD1_TIME_MODIFY
 215         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 217         FATTR4_WORD2_SECURITY_LABEL
 218 #endif
 219 };
 220
 221 static const u32 nfs4_pnfs_open_bitmap[3] = {
 222         FATTR4_WORD0_TYPE
 223         | FATTR4_WORD0_CHANGE
 224         | FATTR4_WORD0_SIZE
 225         | FATTR4_WORD0_FSID
 226         | FATTR4_WORD0_FILEID,
 227         FATTR4_WORD1_MODE
 228         | FATTR4_WORD1_NUMLINKS
 229         | FATTR4_WORD1_OWNER
 230         | FATTR4_WORD1_OWNER_GROUP
 231         | FATTR4_WORD1_RAWDEV
 232         | FATTR4_WORD1_SPACE_USED
 233         | FATTR4_WORD1_TIME_ACCESS
 234         | FATTR4_WORD1_TIME_METADATA
 235         | FATTR4_WORD1_TIME_MODIFY,
 236         FATTR4_WORD2_MDSTHRESHOLD
 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 238         | FATTR4_WORD2_SECURITY_LABEL
 239 #endif
 240 };
 241
 242 static const u32 nfs4_open_noattr_bitmap[3] = {
 243         FATTR4_WORD0_TYPE
 244         | FATTR4_WORD0_FILEID,
 245 };
 246
 247 const u32 nfs4_statfs_bitmap[3] = {
 248         FATTR4_WORD0_FILES_AVAIL
 249         | FATTR4_WORD0_FILES_FREE
 250         | FATTR4_WORD0_FILES_TOTAL,
 251         FATTR4_WORD1_SPACE_AVAIL
 252         | FATTR4_WORD1_SPACE_FREE
 253         | FATTR4_WORD1_SPACE_TOTAL
 254 };
 255
 256 const u32 nfs4_pathconf_bitmap[3] = {
 257         FATTR4_WORD0_MAXLINK
 258         | FATTR4_WORD0_MAXNAME,
 259         0
 260 };
 261
 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 263                         | FATTR4_WORD0_MAXREAD
 264                         | FATTR4_WORD0_MAXWRITE
 265                         | FATTR4_WORD0_LEASE_TIME,
 266                         FATTR4_WORD1_TIME_DELTA
 267                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 268                         FATTR4_WORD2_LAYOUT_BLKSIZE
 269                         | FATTR4_WORD2_CLONE_BLKSIZE
 270                         | FATTR4_WORD2_CHANGE_ATTR_TYPE
 271                         | FATTR4_WORD2_XATTR_SUPPORT
 272 };
 273
 274 const u32 nfs4_fs_locations_bitmap[3] = {
 275         FATTR4_WORD0_CHANGE
 276         | FATTR4_WORD0_SIZE
 277         | FATTR4_WORD0_FSID
 278         | FATTR4_WORD0_FILEID
 279         | FATTR4_WORD0_FS_LOCATIONS,
 280         FATTR4_WORD1_OWNER
 281         | FATTR4_WORD1_OWNER_GROUP
 282         | FATTR4_WORD1_RAWDEV
 283         | FATTR4_WORD1_SPACE_USED
 284         | FATTR4_WORD1_TIME_ACCESS
 285         | FATTR4_WORD1_TIME_METADATA
 286         | FATTR4_WORD1_TIME_MODIFY
 287         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 288 };
 289
 290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 291                                     struct inode *inode, unsigned long flags)
 292 {
 293         unsigned long cache_validity;
 294
 295         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 296         if (!inode || !nfs_have_read_or_write_delegation(inode))
 297                 return;
 298
 299         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
 300
 301         /* Remove the attributes over which we have full control */
 302         dst[1] &= ~FATTR4_WORD1_RAWDEV;
 303         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 304                 dst[0] &= ~FATTR4_WORD0_SIZE;
 305
 306         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 307                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 308
 309         if (!(cache_validity & NFS_INO_INVALID_MODE))
 310                 dst[1] &= ~FATTR4_WORD1_MODE;
 311         if (!(cache_validity & NFS_INO_INVALID_OTHER))
 312                 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
 313
 314         if (nfs_have_delegated_mtime(inode)) {
 315                 if (!(cache_validity & NFS_INO_INVALID_ATIME))
 316                         dst[1] &= ~FATTR4_WORD1_TIME_ACCESS;
 317                 if (!(cache_validity & NFS_INO_INVALID_MTIME))
 318                         dst[1] &= ~FATTR4_WORD1_TIME_MODIFY;
 319                 if (!(cache_validity & NFS_INO_INVALID_CTIME))
 320                         dst[1] &= ~FATTR4_WORD1_TIME_METADATA;
 321         } else if (nfs_have_delegated_atime(inode)) {
 322                 if (!(cache_validity & NFS_INO_INVALID_ATIME))
 323                         dst[1] &= ~FATTR4_WORD1_TIME_ACCESS;
 324         }
 325 }
 326
 327 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 328                 struct nfs4_readdir_arg *readdir)
 329 {
 330         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 331         __be32 *start, *p;
 332
 333         if (cookie > 2) {
 334                 readdir->cookie = cookie;
 335                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 336                 return;
 337         }
 338
 339         readdir->cookie = 0;
 340         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 341         if (cookie == 2)
 342                 return;
 343
 344         /*
 345          * NFSv4 servers do not return entries for '.' and '..'
 346          * Therefore, we fake these entries here.  We let '.'
 347          * have cookie 0 and '..' have cookie 1.  Note that
 348          * when talking to the server, we always send cookie 0
 349          * instead of 1 or 2.
 350          */
 351         start = p = kmap_atomic(*readdir->pages);
 352
 353         if (cookie == 0) {
 354                 *p++ = xdr_one;                                  /* next */
 355                 *p++ = xdr_zero;                   /* cookie, first word */
 356                 *p++ = xdr_one;                   /* cookie, second word */
 357                 *p++ = xdr_one;                             /* entry len */
 358                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 359                 p++;
 360                 *p++ = xdr_one;                         /* bitmap length */
 361                 *p++ = htonl(attrs);                           /* bitmap */
 362                 *p++ = htonl(12);             /* attribute buffer length */
 363                 *p++ = htonl(NF4DIR);
 364                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 365         }
 366
 367         *p++ = xdr_one;                                  /* next */
 368         *p++ = xdr_zero;                   /* cookie, first word */
 369         *p++ = xdr_two;                   /* cookie, second word */
 370         *p++ = xdr_two;                             /* entry len */
 371         memcpy(p, "..\0\0", 4);                         /* entry */
 372         p++;
 373         *p++ = xdr_one;                         /* bitmap length */
 374         *p++ = htonl(attrs);                           /* bitmap */
 375         *p++ = htonl(12);             /* attribute buffer length */
 376         *p++ = htonl(NF4DIR);
 377         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 378
 379         readdir->pgbase = (char *)p - (char *)start;
 380         readdir->count -= readdir->pgbase;
 381         kunmap_atomic(start);
 382 }
 383
 384 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 385 {
 386         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 387                 fattr->pre_change_attr = version;
 388                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 389         }
 390 }
 391
 392 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 393                 nfs4_stateid *stateid,
 394                 const struct cred *cred)
 395 {
 396         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 397
 398         ops->test_and_free_expired(server, stateid, cred);
 399 }
 400
 401 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 402                 nfs4_stateid *stateid,
 403                 const struct cred *cred)
 404 {
 405         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 406         nfs4_test_and_free_stateid(server, stateid, cred);
 407 }
 408
 409 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 410                 const nfs4_stateid *stateid,
 411                 const struct cred *cred)
 412 {
 413         nfs4_stateid tmp;
 414
 415         nfs4_stateid_copy(&tmp, stateid);
 416         __nfs4_free_revoked_stateid(server, &tmp, cred);
 417 }
 418
 419 static long nfs4_update_delay(long *timeout)
 420 {
 421         long ret;
 422         if (!timeout)
 423                 return NFS4_POLL_RETRY_MAX;
 424         if (*timeout <= 0)
 425                 *timeout = NFS4_POLL_RETRY_MIN;
 426         if (*timeout > NFS4_POLL_RETRY_MAX)
 427                 *timeout = NFS4_POLL_RETRY_MAX;
 428         ret = *timeout;
 429         *timeout <<= 1;
 430         return ret;
 431 }
 432
 433 static int nfs4_delay_killable(long *timeout)
 434 {
 435         might_sleep();
 436
 437         __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
 438         schedule_timeout(nfs4_update_delay(timeout));
 439         if (!__fatal_signal_pending(current))
 440                 return 0;
 441         return -EINTR;
 442 }
 443
 444 static int nfs4_delay_interruptible(long *timeout)
 445 {
 446         might_sleep();
 447
 448         __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
 449         schedule_timeout(nfs4_update_delay(timeout));
 450         if (!signal_pending(current))
 451                 return 0;
 452         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 453 }
 454
 455 static int nfs4_delay(long *timeout, bool interruptible)
 456 {
 457         if (interruptible)
 458                 return nfs4_delay_interruptible(timeout);
 459         return nfs4_delay_killable(timeout);
 460 }
 461
 462 static const nfs4_stateid *
 463 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 464 {
 465         if (!stateid)
 466                 return NULL;
 467         switch (stateid->type) {
 468         case NFS4_OPEN_STATEID_TYPE:
 469         case NFS4_LOCK_STATEID_TYPE:
 470         case NFS4_DELEGATION_STATEID_TYPE:
 471                 return stateid;
 472         default:
 473                 break;
 474         }
 475         return NULL;
 476 }
 477
 478 /* This is the error handling routine for processes that are allowed
 479  * to sleep.
 480  */
 481 static int nfs4_do_handle_exception(struct nfs_server *server,
 482                 int errorcode, struct nfs4_exception *exception)
 483 {
 484         struct nfs_client *clp = server->nfs_client;
 485         struct nfs4_state *state = exception->state;
 486         const nfs4_stateid *stateid;
 487         struct inode *inode = exception->inode;
 488         int ret = errorcode;
 489
 490         exception->delay = 0;
 491         exception->recovering = 0;
 492         exception->retry = 0;
 493
 494         stateid = nfs4_recoverable_stateid(exception->stateid);
 495         if (stateid == NULL && state != NULL)
 496                 stateid = nfs4_recoverable_stateid(&state->stateid);
 497
 498         switch(errorcode) {
 499                 case 0:
 500                         return 0;
 501                 case -NFS4ERR_BADHANDLE:
 502                 case -ESTALE:
 503                         if (inode != NULL && S_ISREG(inode->i_mode))
 504                                 pnfs_destroy_layout(NFS_I(inode));
 505                         break;
 506                 case -NFS4ERR_DELEG_REVOKED:
 507                 case -NFS4ERR_ADMIN_REVOKED:
 508                 case -NFS4ERR_EXPIRED:
 509                 case -NFS4ERR_BAD_STATEID:
 510                 case -NFS4ERR_PARTNER_NO_AUTH:
 511                         if (inode != NULL && stateid != NULL) {
 512                                 nfs_inode_find_state_and_recover(inode,
 513                                                 stateid);
 514                                 goto wait_on_recovery;
 515                         }
 516                         fallthrough;
 517                 case -NFS4ERR_OPENMODE:
 518                         if (inode) {
 519                                 int err;
 520
 521                                 err = nfs_async_inode_return_delegation(inode,
 522                                                 stateid);
 523                                 if (err == 0)
 524                                         goto wait_on_recovery;
 525                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 526                                         exception->retry = 1;
 527                                         break;
 528                                 }
 529                         }
 530                         if (state == NULL)
 531                                 break;
 532                         ret = nfs4_schedule_stateid_recovery(server, state);
 533                         if (ret < 0)
 534                                 break;
 535                         goto wait_on_recovery;
 536                 case -NFS4ERR_STALE_STATEID:
 537                 case -NFS4ERR_STALE_CLIENTID:
 538                         nfs4_schedule_lease_recovery(clp);
 539                         goto wait_on_recovery;
 540                 case -NFS4ERR_MOVED:
 541                         ret = nfs4_schedule_migration_recovery(server);
 542                         if (ret < 0)
 543                                 break;
 544                         goto wait_on_recovery;
 545                 case -NFS4ERR_LEASE_MOVED:
 546                         nfs4_schedule_lease_moved_recovery(clp);
 547                         goto wait_on_recovery;
 548 #if defined(CONFIG_NFS_V4_1)
 549                 case -NFS4ERR_BADSESSION:
 550                 case -NFS4ERR_BADSLOT:
 551                 case -NFS4ERR_BAD_HIGH_SLOT:
 552                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 553                 case -NFS4ERR_DEADSESSION:
 554                 case -NFS4ERR_SEQ_FALSE_RETRY:
 555                 case -NFS4ERR_SEQ_MISORDERED:
 556                         /* Handled in nfs41_sequence_process() */
 557                         goto wait_on_recovery;
 558 #endif /* defined(CONFIG_NFS_V4_1) */
 559                 case -NFS4ERR_FILE_OPEN:
 560                         if (exception->timeout > HZ) {
 561                                 /* We have retried a decent amount, time to
 562                                  * fail
 563                                  */
 564                                 ret = -EBUSY;
 565                                 break;
 566                         }
 567                         fallthrough;
 568                 case -NFS4ERR_DELAY:
 569                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 570                         fallthrough;
 571                 case -NFS4ERR_GRACE:
 572                 case -NFS4ERR_LAYOUTTRYLATER:
 573                 case -NFS4ERR_RECALLCONFLICT:
 574                 case -NFS4ERR_RETURNCONFLICT:
 575                         exception->delay = 1;
 576                         return 0;
 577
 578                 case -NFS4ERR_RETRY_UNCACHED_REP:
 579                 case -NFS4ERR_OLD_STATEID:
 580                         exception->retry = 1;
 581                         break;
 582                 case -NFS4ERR_BADOWNER:
 583                         /* The following works around a Linux server bug! */
 584                 case -NFS4ERR_BADNAME:
 585                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 586                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 587                                 exception->retry = 1;
 588                                 printk(KERN_WARNING "NFS: v4 server %s "
 589                                                 "does not accept raw "
 590                                                 "uid/gids. "
 591                                                 "Reenabling the idmapper.\n",
 592                                                 server->nfs_client->cl_hostname);
 593                         }
 594         }
 595         /* We failed to handle the error */
 596         return nfs4_map_errors(ret);
 597 wait_on_recovery:
 598         exception->recovering = 1;
 599         return 0;
 600 }
 601
 602 /*
 603  * Track the number of NFS4ERR_DELAY related retransmissions and return
 604  * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
 605  * set by 'nfs_delay_retrans'.
 606  */
 607 static int nfs4_exception_should_retrans(const struct nfs_server *server,
 608                                          struct nfs4_exception *exception)
 609 {
 610         if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
 611                 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
 612                         return -EAGAIN;
 613         }
 614         return 0;
 615 }
 616
 617 /* This is the error handling routine for processes that are allowed
 618  * to sleep.
 619  */
 620 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 621 {
 622         struct nfs_client *clp = server->nfs_client;
 623         int ret;
 624
 625         ret = nfs4_do_handle_exception(server, errorcode, exception);
 626         if (exception->delay) {
 627                 int ret2 = nfs4_exception_should_retrans(server, exception);
 628                 if (ret2 < 0) {
 629                         exception->retry = 0;
 630                         return ret2;
 631                 }
 632                 ret = nfs4_delay(&exception->timeout,
 633                                 exception->interruptible);
 634                 goto out_retry;
 635         }
 636         if (exception->recovering) {
 637                 if (exception->task_is_privileged)
 638                         return -EDEADLOCK;
 639                 ret = nfs4_wait_clnt_recover(clp);
 640                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 641                         return -EIO;
 642                 goto out_retry;
 643         }
 644         return ret;
 645 out_retry:
 646         if (ret == 0)
 647                 exception->retry = 1;
 648         return ret;
 649 }
 650
 651 static int
 652 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 653                 int errorcode, struct nfs4_exception *exception)
 654 {
 655         struct nfs_client *clp = server->nfs_client;
 656         int ret;
 657
 658         ret = nfs4_do_handle_exception(server, errorcode, exception);
 659         if (exception->delay) {
 660                 int ret2 = nfs4_exception_should_retrans(server, exception);
 661                 if (ret2 < 0) {
 662                         exception->retry = 0;
 663                         return ret2;
 664                 }
 665                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 666                 goto out_retry;
 667         }
 668         if (exception->recovering) {
 669                 if (exception->task_is_privileged)
 670                         return -EDEADLOCK;
 671                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 672                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 673                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 674                 goto out_retry;
 675         }
 676         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 677                 ret = -EIO;
 678         return ret;
 679 out_retry:
 680         if (ret == 0) {
 681                 exception->retry = 1;
 682                 /*
 683                  * For NFS4ERR_MOVED, the client transport will need to
 684                  * be recomputed after migration recovery has completed.
 685                  */
 686                 if (errorcode == -NFS4ERR_MOVED)
 687                         rpc_task_release_transport(task);
 688         }
 689         return ret;
 690 }
 691
 692 int
 693 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 694                         struct nfs4_state *state, long *timeout)
 695 {
 696         struct nfs4_exception exception = {
 697                 .state = state,
 698         };
 699
 700         if (task->tk_status >= 0)
 701                 return 0;
 702         if (timeout)
 703                 exception.timeout = *timeout;
 704         task->tk_status = nfs4_async_handle_exception(task, server,
 705                         task->tk_status,
 706                         &exception);
 707         if (exception.delay && timeout)
 708                 *timeout = exception.timeout;
 709         if (exception.retry)
 710                 return -EAGAIN;
 711         return 0;
 712 }
 713
 714 /*
 715  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 716  * or 'false' otherwise.
 717  */
 718 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 719 {
 720         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 721         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 722 }
 723
 724 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 725 {
 726         spin_lock(&clp->cl_lock);
 727         if (time_before(clp->cl_last_renewal,timestamp))
 728                 clp->cl_last_renewal = timestamp;
 729         spin_unlock(&clp->cl_lock);
 730 }
 731
 732 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 733 {
 734         struct nfs_client *clp = server->nfs_client;
 735
 736         if (!nfs4_has_session(clp))
 737                 do_renew_lease(clp, timestamp);
 738 }
 739
 740 struct nfs4_call_sync_data {
 741         const struct nfs_server *seq_server;
 742         struct nfs4_sequence_args *seq_args;
 743         struct nfs4_sequence_res *seq_res;
 744 };
 745
 746 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 747                         struct nfs4_sequence_res *res, int cache_reply,
 748                         int privileged)
 749 {
 750         args->sa_slot = NULL;
 751         args->sa_cache_this = cache_reply;
 752         args->sa_privileged = privileged;
 753
 754         res->sr_slot = NULL;
 755 }
 756
 757 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 758 {
 759         struct nfs4_slot *slot = res->sr_slot;
 760         struct nfs4_slot_table *tbl;
 761
 762         tbl = slot->table;
 763         spin_lock(&tbl->slot_tbl_lock);
 764         if (!nfs41_wake_and_assign_slot(tbl, slot))
 765                 nfs4_free_slot(tbl, slot);
 766         spin_unlock(&tbl->slot_tbl_lock);
 767
 768         res->sr_slot = NULL;
 769 }
 770
 771 static int nfs40_sequence_done(struct rpc_task *task,
 772                                struct nfs4_sequence_res *res)
 773 {
 774         if (res->sr_slot != NULL)
 775                 nfs40_sequence_free_slot(res);
 776         return 1;
 777 }
 778
 779 #if defined(CONFIG_NFS_V4_1)
 780
 781 static void nfs41_release_slot(struct nfs4_slot *slot)
 782 {
 783         struct nfs4_session *session;
 784         struct nfs4_slot_table *tbl;
 785         bool send_new_highest_used_slotid = false;
 786
 787         if (!slot)
 788                 return;
 789         tbl = slot->table;
 790         session = tbl->session;
 791
 792         /* Bump the slot sequence number */
 793         if (slot->seq_done)
 794                 slot->seq_nr++;
 795         slot->seq_done = 0;
 796
 797         spin_lock(&tbl->slot_tbl_lock);
 798         /* Be nice to the server: try to ensure that the last transmitted
 799          * value for highest_user_slotid <= target_highest_slotid
 800          */
 801         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 802                 send_new_highest_used_slotid = true;
 803
 804         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 805                 send_new_highest_used_slotid = false;
 806                 goto out_unlock;
 807         }
 808         nfs4_free_slot(tbl, slot);
 809
 810         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 811                 send_new_highest_used_slotid = false;
 812 out_unlock:
 813         spin_unlock(&tbl->slot_tbl_lock);
 814         if (send_new_highest_used_slotid)
 815                 nfs41_notify_server(session->clp);
 816         if (waitqueue_active(&tbl->slot_waitq))
 817                 wake_up_all(&tbl->slot_waitq);
 818 }
 819
 820 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 821 {
 822         nfs41_release_slot(res->sr_slot);
 823         res->sr_slot = NULL;
 824 }
 825
 826 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 827                 u32 seqnr)
 828 {
 829         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 830                 slot->seq_nr_highest_sent = seqnr;
 831 }
 832 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 833 {
 834         nfs4_slot_sequence_record_sent(slot, seqnr);
 835         slot->seq_nr_last_acked = seqnr;
 836 }
 837
 838 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 839                                 struct nfs4_slot *slot)
 840 {
 841         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 842         if (!IS_ERR(task))
 843                 rpc_put_task_async(task);
 844 }
 845
 846 static int nfs41_sequence_process(struct rpc_task *task,
 847                 struct nfs4_sequence_res *res)
 848 {
 849         struct nfs4_session *session;
 850         struct nfs4_slot *slot = res->sr_slot;
 851         struct nfs_client *clp;
 852         int status;
 853         int ret = 1;
 854
 855         if (slot == NULL)
 856                 goto out_noaction;
 857         /* don't increment the sequence number if the task wasn't sent */
 858         if (!RPC_WAS_SENT(task) || slot->seq_done)
 859                 goto out;
 860
 861         session = slot->table->session;
 862         clp = session->clp;
 863
 864         trace_nfs4_sequence_done(session, res);
 865
 866         status = res->sr_status;
 867         if (task->tk_status == -NFS4ERR_DEADSESSION)
 868                 status = -NFS4ERR_DEADSESSION;
 869
 870         /* Check the SEQUENCE operation status */
 871         switch (status) {
 872         case 0:
 873                 /* Mark this sequence number as having been acked */
 874                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 875                 /* Update the slot's sequence and clientid lease timer */
 876                 slot->seq_done = 1;
 877                 do_renew_lease(clp, res->sr_timestamp);
 878                 /* Check sequence flags */
 879                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 880                                 !!slot->privileged);
 881                 nfs41_update_target_slotid(slot->table, slot, res);
 882                 break;
 883         case 1:
 884                 /*
 885                  * sr_status remains 1 if an RPC level error occurred.
 886                  * The server may or may not have processed the sequence
 887                  * operation..
 888                  */
 889                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 890                 slot->seq_done = 1;
 891                 goto out;
 892         case -NFS4ERR_DELAY:
 893                 /* The server detected a resend of the RPC call and
 894                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 895                  * of RFC5661.
 896                  */
 897                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 898                         __func__,
 899                         slot->slot_nr,
 900                         slot->seq_nr);
 901                 goto out_retry;
 902         case -NFS4ERR_RETRY_UNCACHED_REP:
 903         case -NFS4ERR_SEQ_FALSE_RETRY:
 904                 /*
 905                  * The server thinks we tried to replay a request.
 906                  * Retry the call after bumping the sequence ID.
 907                  */
 908                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 909                 goto retry_new_seq;
 910         case -NFS4ERR_BADSLOT:
 911                 /*
 912                  * The slot id we used was probably retired. Try again
 913                  * using a different slot id.
 914                  */
 915                 if (slot->slot_nr < slot->table->target_highest_slotid)
 916                         goto session_recover;
 917                 goto retry_nowait;
 918         case -NFS4ERR_SEQ_MISORDERED:
 919                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 920                 /*
 921                  * Were one or more calls using this slot interrupted?
 922                  * If the server never received the request, then our
 923                  * transmitted slot sequence number may be too high. However,
 924                  * if the server did receive the request then it might
 925                  * accidentally give us a reply with a mismatched operation.
 926                  * We can sort this out by sending a lone sequence operation
 927                  * to the server on the same slot.
 928                  */
 929                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 930                         slot->seq_nr--;
 931                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 932                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 933                                 res->sr_slot = NULL;
 934                         }
 935                         goto retry_nowait;
 936                 }
 937                 /*
 938                  * RFC5661:
 939                  * A retry might be sent while the original request is
 940                  * still in progress on the replier. The replier SHOULD
 941                  * deal with the issue by returning NFS4ERR_DELAY as the
 942                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 943                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 944                  *
 945                  * Restart the search after a delay.
 946                  */
 947                 slot->seq_nr = slot->seq_nr_highest_sent;
 948                 goto out_retry;
 949         case -NFS4ERR_BADSESSION:
 950         case -NFS4ERR_DEADSESSION:
 951         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 952                 goto session_recover;
 953         default:
 954                 /* Just update the slot sequence no. */
 955                 slot->seq_done = 1;
 956         }
 957 out:
 958         /* The session may be reset by one of the error handlers. */
 959         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 960 out_noaction:
 961         return ret;
 962 session_recover:
 963         set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
 964         nfs4_schedule_session_recovery(session, status);
 965         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 966         nfs41_sequence_free_slot(res);
 967         goto out;
 968 retry_new_seq:
 969         ++slot->seq_nr;
 970 retry_nowait:
 971         if (rpc_restart_call_prepare(task)) {
 972                 nfs41_sequence_free_slot(res);
 973                 task->tk_status = 0;
 974                 ret = 0;
 975         }
 976         goto out;
 977 out_retry:
 978         if (!rpc_restart_call(task))
 979                 goto out;
 980         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 981         return 0;
 982 }
 983
 984 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 985 {
 986         if (!nfs41_sequence_process(task, res))
 987                 return 0;
 988         if (res->sr_slot != NULL)
 989                 nfs41_sequence_free_slot(res);
 990         return 1;
 991
 992 }
 993 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 994
 995 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 996 {
 997         if (res->sr_slot == NULL)
 998                 return 1;
 999         if (res->sr_slot->table->session != NULL)
1000                 return nfs41_sequence_process(task, res);
1001         return nfs40_sequence_done(task, res);
1002 }
1003
1004 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1005 {
1006         if (res->sr_slot != NULL) {
1007                 if (res->sr_slot->table->session != NULL)
1008                         nfs41_sequence_free_slot(res);
1009                 else
1010                         nfs40_sequence_free_slot(res);
1011         }
1012 }
1013
1014 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1015 {
1016         if (res->sr_slot == NULL)
1017                 return 1;
1018         if (!res->sr_slot->table->session)
1019                 return nfs40_sequence_done(task, res);
1020         return nfs41_sequence_done(task, res);
1021 }
1022 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1023
1024 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
1025 {
1026         struct nfs4_call_sync_data *data = calldata;
1027
1028         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1029
1030         nfs4_setup_sequence(data->seq_server->nfs_client,
1031                             data->seq_args, data->seq_res, task);
1032 }
1033
1034 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1035 {
1036         struct nfs4_call_sync_data *data = calldata;
1037
1038         nfs41_sequence_done(task, data->seq_res);
1039 }
1040
1041 static const struct rpc_call_ops nfs41_call_sync_ops = {
1042         .rpc_call_prepare = nfs41_call_sync_prepare,
1043         .rpc_call_done = nfs41_call_sync_done,
1044 };
1045
1046 #else   /* !CONFIG_NFS_V4_1 */
1047
1048 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1049 {
1050         return nfs40_sequence_done(task, res);
1051 }
1052
1053 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1054 {
1055         if (res->sr_slot != NULL)
1056                 nfs40_sequence_free_slot(res);
1057 }
1058
1059 int nfs4_sequence_done(struct rpc_task *task,
1060                        struct nfs4_sequence_res *res)
1061 {
1062         return nfs40_sequence_done(task, res);
1063 }
1064 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1065
1066 #endif  /* !CONFIG_NFS_V4_1 */
1067
1068 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1069 {
1070         res->sr_timestamp = jiffies;
1071         res->sr_status_flags = 0;
1072         res->sr_status = 1;
1073 }
1074
1075 static
1076 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1077                 struct nfs4_sequence_res *res,
1078                 struct nfs4_slot *slot)
1079 {
1080         if (!slot)
1081                 return;
1082         slot->privileged = args->sa_privileged ? 1 : 0;
1083         args->sa_slot = slot;
1084
1085         res->sr_slot = slot;
1086 }
1087
1088 int nfs4_setup_sequence(struct nfs_client *client,
1089                         struct nfs4_sequence_args *args,
1090                         struct nfs4_sequence_res *res,
1091                         struct rpc_task *task)
1092 {
1093         struct nfs4_session *session = nfs4_get_session(client);
1094         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1095         struct nfs4_slot *slot;
1096
1097         /* slot already allocated? */
1098         if (res->sr_slot != NULL)
1099                 goto out_start;
1100
1101         if (session)
1102                 tbl = &session->fc_slot_table;
1103
1104         spin_lock(&tbl->slot_tbl_lock);
1105         /* The state manager will wait until the slot table is empty */
1106         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1107                 goto out_sleep;
1108
1109         slot = nfs4_alloc_slot(tbl);
1110         if (IS_ERR(slot)) {
1111                 if (slot == ERR_PTR(-ENOMEM))
1112                         goto out_sleep_timeout;
1113                 goto out_sleep;
1114         }
1115         spin_unlock(&tbl->slot_tbl_lock);
1116
1117         nfs4_sequence_attach_slot(args, res, slot);
1118
1119         trace_nfs4_setup_sequence(session, args);
1120 out_start:
1121         nfs41_sequence_res_init(res);
1122         rpc_call_start(task);
1123         return 0;
1124 out_sleep_timeout:
1125         /* Try again in 1/4 second */
1126         if (args->sa_privileged)
1127                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1128                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1129         else
1130                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1131                                 NULL, jiffies + (HZ >> 2));
1132         spin_unlock(&tbl->slot_tbl_lock);
1133         return -EAGAIN;
1134 out_sleep:
1135         if (args->sa_privileged)
1136                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1137                                 RPC_PRIORITY_PRIVILEGED);
1138         else
1139                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1140         spin_unlock(&tbl->slot_tbl_lock);
1141         return -EAGAIN;
1142 }
1143 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1144
1145 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1146 {
1147         struct nfs4_call_sync_data *data = calldata;
1148         nfs4_setup_sequence(data->seq_server->nfs_client,
1149                                 data->seq_args, data->seq_res, task);
1150 }
1151
1152 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1153 {
1154         struct nfs4_call_sync_data *data = calldata;
1155         nfs4_sequence_done(task, data->seq_res);
1156 }
1157
1158 static const struct rpc_call_ops nfs40_call_sync_ops = {
1159         .rpc_call_prepare = nfs40_call_sync_prepare,
1160         .rpc_call_done = nfs40_call_sync_done,
1161 };
1162
1163 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1164 {
1165         int ret;
1166         struct rpc_task *task;
1167
1168         task = rpc_run_task(task_setup);
1169         if (IS_ERR(task))
1170                 return PTR_ERR(task);
1171
1172         ret = task->tk_status;
1173         rpc_put_task(task);
1174         return ret;
1175 }
1176
1177 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1178                              struct nfs_server *server,
1179                              struct rpc_message *msg,
1180                              struct nfs4_sequence_args *args,
1181                              struct nfs4_sequence_res *res,
1182                              unsigned short task_flags)
1183 {
1184         struct nfs_client *clp = server->nfs_client;
1185         struct nfs4_call_sync_data data = {
1186                 .seq_server = server,
1187                 .seq_args = args,
1188                 .seq_res = res,
1189         };
1190         struct rpc_task_setup task_setup = {
1191                 .rpc_client = clnt,
1192                 .rpc_message = msg,
1193                 .callback_ops = clp->cl_mvops->call_sync_ops,
1194                 .callback_data = &data,
1195                 .flags = task_flags,
1196         };
1197
1198         return nfs4_call_sync_custom(&task_setup);
1199 }
1200
1201 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1202                                    struct nfs_server *server,
1203                                    struct rpc_message *msg,
1204                                    struct nfs4_sequence_args *args,
1205                                    struct nfs4_sequence_res *res)
1206 {
1207         unsigned short task_flags = 0;
1208
1209         if (server->caps & NFS_CAP_MOVEABLE)
1210                 task_flags = RPC_TASK_MOVEABLE;
1211         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1212 }
1213
1214
1215 int nfs4_call_sync(struct rpc_clnt *clnt,
1216                    struct nfs_server *server,
1217                    struct rpc_message *msg,
1218                    struct nfs4_sequence_args *args,
1219                    struct nfs4_sequence_res *res,
1220                    int cache_reply)
1221 {
1222         nfs4_init_sequence(args, res, cache_reply, 0);
1223         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1224 }
1225
1226 static void
1227 nfs4_inc_nlink_locked(struct inode *inode)
1228 {
1229         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1230                                              NFS_INO_INVALID_CTIME |
1231                                              NFS_INO_INVALID_NLINK);
1232         inc_nlink(inode);
1233 }
1234
1235 static void
1236 nfs4_inc_nlink(struct inode *inode)
1237 {
1238         spin_lock(&inode->i_lock);
1239         nfs4_inc_nlink_locked(inode);
1240         spin_unlock(&inode->i_lock);
1241 }
1242
1243 static void
1244 nfs4_dec_nlink_locked(struct inode *inode)
1245 {
1246         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1247                                              NFS_INO_INVALID_CTIME |
1248                                              NFS_INO_INVALID_NLINK);
1249         drop_nlink(inode);
1250 }
1251
1252 static void
1253 nfs4_update_changeattr_locked(struct inode *inode,
1254                 struct nfs4_change_info *cinfo,
1255                 unsigned long timestamp, unsigned long cache_validity)
1256 {
1257         struct nfs_inode *nfsi = NFS_I(inode);
1258         u64 change_attr = inode_peek_iversion_raw(inode);
1259
1260         if (!nfs_have_delegated_mtime(inode))
1261                 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1262         if (S_ISDIR(inode->i_mode))
1263                 cache_validity |= NFS_INO_INVALID_DATA;
1264
1265         switch (NFS_SERVER(inode)->change_attr_type) {
1266         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1267                 if (cinfo->after == change_attr)
1268                         goto out;
1269                 break;
1270         default:
1271                 if ((s64)(change_attr - cinfo->after) >= 0)
1272                         goto out;
1273         }
1274
1275         inode_set_iversion_raw(inode, cinfo->after);
1276         if (!cinfo->atomic || cinfo->before != change_attr) {
1277                 if (S_ISDIR(inode->i_mode))
1278                         nfs_force_lookup_revalidate(inode);
1279
1280                 if (!nfs_have_delegated_attributes(inode))
1281                         cache_validity |=
1282                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1283                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1284                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1285                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1286                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1287         }
1288         nfsi->attrtimeo_timestamp = jiffies;
1289         nfsi->read_cache_jiffies = timestamp;
1290         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1291         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1292 out:
1293         nfs_set_cache_invalid(inode, cache_validity);
1294 }
1295
1296 void
1297 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1298                 unsigned long timestamp, unsigned long cache_validity)
1299 {
1300         spin_lock(&dir->i_lock);
1301         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1302         spin_unlock(&dir->i_lock);
1303 }
1304
1305 struct nfs4_open_createattrs {
1306         struct nfs4_label *label;
1307         struct iattr *sattr;
1308         const __u32 verf[2];
1309 };
1310
1311 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1312                 int err, struct nfs4_exception *exception)
1313 {
1314         if (err != -EINVAL)
1315                 return false;
1316         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1317                 return false;
1318         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1319         exception->retry = 1;
1320         return true;
1321 }
1322
1323 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1324 {
1325          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1326 }
1327
1328 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1329 {
1330         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1331
1332         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1333 }
1334
1335 static u32
1336 nfs4_fmode_to_share_access(fmode_t fmode)
1337 {
1338         u32 res = 0;
1339
1340         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1341         case FMODE_READ:
1342                 res = NFS4_SHARE_ACCESS_READ;
1343                 break;
1344         case FMODE_WRITE:
1345                 res = NFS4_SHARE_ACCESS_WRITE;
1346                 break;
1347         case FMODE_READ|FMODE_WRITE:
1348                 res = NFS4_SHARE_ACCESS_BOTH;
1349         }
1350         return res;
1351 }
1352
1353 static u32
1354 nfs4_map_atomic_open_share(struct nfs_server *server,
1355                 fmode_t fmode, int openflags)
1356 {
1357         u32 res = nfs4_fmode_to_share_access(fmode);
1358
1359         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1360                 goto out;
1361         /* Want no delegation if we're using O_DIRECT */
1362         if (openflags & O_DIRECT) {
1363                 res |= NFS4_SHARE_WANT_NO_DELEG;
1364                 goto out;
1365         }
1366         /* res |= NFS4_SHARE_WANT_NO_PREFERENCE; */
1367         if (server->caps & NFS_CAP_DELEGTIME)
1368                 res |= NFS4_SHARE_WANT_DELEG_TIMESTAMPS;
1369         if (server->caps & NFS_CAP_OPEN_XOR)
1370                 res |= NFS4_SHARE_WANT_OPEN_XOR_DELEGATION;
1371 out:
1372         return res;
1373 }
1374
1375 static enum open_claim_type4
1376 nfs4_map_atomic_open_claim(struct nfs_server *server,
1377                 enum open_claim_type4 claim)
1378 {
1379         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1380                 return claim;
1381         switch (claim) {
1382         default:
1383                 return claim;
1384         case NFS4_OPEN_CLAIM_FH:
1385                 return NFS4_OPEN_CLAIM_NULL;
1386         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1387                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1388         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1389                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1390         }
1391 }
1392
1393 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1394 {
1395         p->o_res.f_attr = &p->f_attr;
1396         p->o_res.seqid = p->o_arg.seqid;
1397         p->c_res.seqid = p->c_arg.seqid;
1398         p->o_res.server = p->o_arg.server;
1399         p->o_res.access_request = p->o_arg.access;
1400         nfs_fattr_init(&p->f_attr);
1401         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1402 }
1403
1404 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1405                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1406                 const struct nfs4_open_createattrs *c,
1407                 enum open_claim_type4 claim,
1408                 gfp_t gfp_mask)
1409 {
1410         struct dentry *parent = dget_parent(dentry);
1411         struct inode *dir = d_inode(parent);
1412         struct nfs_server *server = NFS_SERVER(dir);
1413         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1414         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1415         struct nfs4_opendata *p;
1416
1417         p = kzalloc(sizeof(*p), gfp_mask);
1418         if (p == NULL)
1419                 goto err;
1420
1421         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1422         if (IS_ERR(p->f_attr.label))
1423                 goto err_free_p;
1424
1425         p->a_label = nfs4_label_alloc(server, gfp_mask);
1426         if (IS_ERR(p->a_label))
1427                 goto err_free_f;
1428
1429         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1430         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1431         if (IS_ERR(p->o_arg.seqid))
1432                 goto err_free_label;
1433         nfs_sb_active(dentry->d_sb);
1434         p->dentry = dget(dentry);
1435         p->dir = parent;
1436         p->owner = sp;
1437         atomic_inc(&sp->so_count);
1438         p->o_arg.open_flags = flags;
1439         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1440         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1441         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1442                         fmode, flags);
1443         if (flags & O_CREAT) {
1444                 p->o_arg.umask = current_umask();
1445                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1446                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1447                         p->o_arg.u.attrs = &p->attrs;
1448                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1449
1450                         memcpy(p->o_arg.u.verifier.data, c->verf,
1451                                         sizeof(p->o_arg.u.verifier.data));
1452                 }
1453         }
1454         /* ask server to check for all possible rights as results
1455          * are cached */
1456         switch (p->o_arg.claim) {
1457         default:
1458                 break;
1459         case NFS4_OPEN_CLAIM_NULL:
1460         case NFS4_OPEN_CLAIM_FH:
1461                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1462                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1463                                   NFS4_ACCESS_EXECUTE |
1464                                   nfs_access_xattr_mask(server);
1465         }
1466         p->o_arg.clientid = server->nfs_client->cl_clientid;
1467         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1468         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1469         p->o_arg.name = &dentry->d_name;
1470         p->o_arg.server = server;
1471         p->o_arg.bitmask = nfs4_bitmask(server, label);
1472         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1473         switch (p->o_arg.claim) {
1474         case NFS4_OPEN_CLAIM_NULL:
1475         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1476         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1477                 p->o_arg.fh = NFS_FH(dir);
1478                 break;
1479         case NFS4_OPEN_CLAIM_PREVIOUS:
1480         case NFS4_OPEN_CLAIM_FH:
1481         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1482         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1483                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1484         }
1485         p->c_arg.fh = &p->o_res.fh;
1486         p->c_arg.stateid = &p->o_res.stateid;
1487         p->c_arg.seqid = p->o_arg.seqid;
1488         nfs4_init_opendata_res(p);
1489         kref_init(&p->kref);
1490         return p;
1491
1492 err_free_label:
1493         nfs4_label_free(p->a_label);
1494 err_free_f:
1495         nfs4_label_free(p->f_attr.label);
1496 err_free_p:
1497         kfree(p);
1498 err:
1499         dput(parent);
1500         return NULL;
1501 }
1502
1503 static void nfs4_opendata_free(struct kref *kref)
1504 {
1505         struct nfs4_opendata *p = container_of(kref,
1506                         struct nfs4_opendata, kref);
1507         struct super_block *sb = p->dentry->d_sb;
1508
1509         nfs4_lgopen_release(p->lgp);
1510         nfs_free_seqid(p->o_arg.seqid);
1511         nfs4_sequence_free_slot(&p->o_res.seq_res);
1512         if (p->state != NULL)
1513                 nfs4_put_open_state(p->state);
1514         nfs4_put_state_owner(p->owner);
1515
1516         nfs4_label_free(p->a_label);
1517         nfs4_label_free(p->f_attr.label);
1518
1519         dput(p->dir);
1520         dput(p->dentry);
1521         nfs_sb_deactive(sb);
1522         nfs_fattr_free_names(&p->f_attr);
1523         kfree(p->f_attr.mdsthreshold);
1524         kfree(p);
1525 }
1526
1527 static void nfs4_opendata_put(struct nfs4_opendata *p)
1528 {
1529         if (p != NULL)
1530                 kref_put(&p->kref, nfs4_opendata_free);
1531 }
1532
1533 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1534                 fmode_t fmode)
1535 {
1536         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1537         case FMODE_READ|FMODE_WRITE:
1538                 return state->n_rdwr != 0;
1539         case FMODE_WRITE:
1540                 return state->n_wronly != 0;
1541         case FMODE_READ:
1542                 return state->n_rdonly != 0;
1543         }
1544         WARN_ON_ONCE(1);
1545         return false;
1546 }
1547
1548 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1549                 int open_mode, enum open_claim_type4 claim)
1550 {
1551         int ret = 0;
1552
1553         if (open_mode & (O_EXCL|O_TRUNC))
1554                 goto out;
1555         switch (claim) {
1556         case NFS4_OPEN_CLAIM_NULL:
1557         case NFS4_OPEN_CLAIM_FH:
1558                 goto out;
1559         default:
1560                 break;
1561         }
1562         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1563                 case FMODE_READ:
1564                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1565                                 && state->n_rdonly != 0;
1566                         break;
1567                 case FMODE_WRITE:
1568                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1569                                 && state->n_wronly != 0;
1570                         break;
1571                 case FMODE_READ|FMODE_WRITE:
1572                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1573                                 && state->n_rdwr != 0;
1574         }
1575 out:
1576         return ret;
1577 }
1578
1579 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1580                 enum open_claim_type4 claim)
1581 {
1582         if (delegation == NULL)
1583                 return 0;
1584         if ((delegation->type & fmode) != fmode)
1585                 return 0;
1586         switch (claim) {
1587         case NFS4_OPEN_CLAIM_NULL:
1588         case NFS4_OPEN_CLAIM_FH:
1589                 break;
1590         case NFS4_OPEN_CLAIM_PREVIOUS:
1591                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1592                         break;
1593                 fallthrough;
1594         default:
1595                 return 0;
1596         }
1597         nfs_mark_delegation_referenced(delegation);
1598         return 1;
1599 }
1600
1601 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1602 {
1603         switch (fmode) {
1604                 case FMODE_WRITE:
1605                         state->n_wronly++;
1606                         break;
1607                 case FMODE_READ:
1608                         state->n_rdonly++;
1609                         break;
1610                 case FMODE_READ|FMODE_WRITE:
1611                         state->n_rdwr++;
1612         }
1613         nfs4_state_set_mode_locked(state, state->state | fmode);
1614 }
1615
1616 #ifdef CONFIG_NFS_V4_1
1617 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1618 {
1619         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1620                 return true;
1621         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1622                 return true;
1623         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1624                 return true;
1625         return false;
1626 }
1627 #endif /* CONFIG_NFS_V4_1 */
1628
1629 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1630 {
1631         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1632                 wake_up_all(&state->waitq);
1633 }
1634
1635 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1636 {
1637         struct nfs_client *clp = state->owner->so_server->nfs_client;
1638         bool need_recover = false;
1639
1640         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1641                 need_recover = true;
1642         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1643                 need_recover = true;
1644         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1645                 need_recover = true;
1646         if (need_recover)
1647                 nfs4_state_mark_reclaim_nograce(clp, state);
1648 }
1649
1650 /*
1651  * Check for whether or not the caller may update the open stateid
1652  * to the value passed in by stateid.
1653  *
1654  * Note: This function relies heavily on the server implementing
1655  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1656  * correctly.
1657  * i.e. The stateid seqids have to be initialised to 1, and
1658  * are then incremented on every state transition.
1659  */
1660 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1661                 const nfs4_stateid *stateid)
1662 {
1663         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1664                 /* The common case - we're updating to a new sequence number */
1665                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1666                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1667                                 return true;
1668                         return false;
1669                 }
1670                 /* The server returned a new stateid */
1671         }
1672         /* This is the first OPEN in this generation */
1673         if (stateid->seqid == cpu_to_be32(1))
1674                 return true;
1675         return false;
1676 }
1677
1678 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1679 {
1680         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1681                 return;
1682         if (state->n_wronly)
1683                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1684         if (state->n_rdonly)
1685                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1686         if (state->n_rdwr)
1687                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1688         set_bit(NFS_OPEN_STATE, &state->flags);
1689 }
1690
1691 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1692                 nfs4_stateid *stateid, fmode_t fmode)
1693 {
1694         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1695         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1696         case FMODE_WRITE:
1697                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1698                 break;
1699         case FMODE_READ:
1700                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1701                 break;
1702         case 0:
1703                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1704                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1705                 clear_bit(NFS_OPEN_STATE, &state->flags);
1706         }
1707         if (stateid == NULL)
1708                 return;
1709         /* Handle OPEN+OPEN_DOWNGRADE races */
1710         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1711             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1712                 nfs_resync_open_stateid_locked(state);
1713                 goto out;
1714         }
1715         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1716                 nfs4_stateid_copy(&state->stateid, stateid);
1717         nfs4_stateid_copy(&state->open_stateid, stateid);
1718         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1719 out:
1720         nfs_state_log_update_open_stateid(state);
1721 }
1722
1723 static void nfs_clear_open_stateid(struct nfs4_state *state,
1724         nfs4_stateid *arg_stateid,
1725         nfs4_stateid *stateid, fmode_t fmode)
1726 {
1727         write_seqlock(&state->seqlock);
1728         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1729         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1730                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1731         write_sequnlock(&state->seqlock);
1732         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1733                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1734 }
1735
1736 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1737                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1738         __must_hold(&state->owner->so_lock)
1739         __must_hold(&state->seqlock)
1740         __must_hold(RCU)
1741
1742 {
1743         DEFINE_WAIT(wait);
1744         int status = 0;
1745         for (;;) {
1746
1747                 if (nfs_stateid_is_sequential(state, stateid))
1748                         break;
1749
1750                 if (status)
1751                         break;
1752                 /* Rely on seqids for serialisation with NFSv4.0 */
1753                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1754                         break;
1755
1756                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1757                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1758                 /*
1759                  * Ensure we process the state changes in the same order
1760                  * in which the server processed them by delaying the
1761                  * update of the stateid until we are in sequence.
1762                  */
1763                 write_sequnlock(&state->seqlock);
1764                 spin_unlock(&state->owner->so_lock);
1765                 rcu_read_unlock();
1766                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1767
1768                 if (!fatal_signal_pending(current)) {
1769                         if (schedule_timeout(5*HZ) == 0)
1770                                 status = -EAGAIN;
1771                         else
1772                                 status = 0;
1773                 } else
1774                         status = -EINTR;
1775                 finish_wait(&state->waitq, &wait);
1776                 rcu_read_lock();
1777                 spin_lock(&state->owner->so_lock);
1778                 write_seqlock(&state->seqlock);
1779         }
1780
1781         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1782             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1783                 nfs4_stateid_copy(freeme, &state->open_stateid);
1784                 nfs_test_and_clear_all_open_stateid(state);
1785         }
1786
1787         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1788                 nfs4_stateid_copy(&state->stateid, stateid);
1789         nfs4_stateid_copy(&state->open_stateid, stateid);
1790         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1791         nfs_state_log_update_open_stateid(state);
1792 }
1793
1794 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1795                 const nfs4_stateid *open_stateid,
1796                 fmode_t fmode,
1797                 nfs4_stateid *freeme)
1798 {
1799         /*
1800          * Protect the call to nfs4_state_set_mode_locked and
1801          * serialise the stateid update
1802          */
1803         write_seqlock(&state->seqlock);
1804         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1805         switch (fmode) {
1806         case FMODE_READ:
1807                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1808                 break;
1809         case FMODE_WRITE:
1810                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1811                 break;
1812         case FMODE_READ|FMODE_WRITE:
1813                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1814         }
1815         set_bit(NFS_OPEN_STATE, &state->flags);
1816         write_sequnlock(&state->seqlock);
1817 }
1818
1819 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1820 {
1821         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1822         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1823         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1824         clear_bit(NFS_OPEN_STATE, &state->flags);
1825 }
1826
1827 static void nfs_state_set_delegation(struct nfs4_state *state,
1828                 const nfs4_stateid *deleg_stateid,
1829                 fmode_t fmode)
1830 {
1831         /*
1832          * Protect the call to nfs4_state_set_mode_locked and
1833          * serialise the stateid update
1834          */
1835         write_seqlock(&state->seqlock);
1836         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1837         set_bit(NFS_DELEGATED_STATE, &state->flags);
1838         write_sequnlock(&state->seqlock);
1839 }
1840
1841 static void nfs_state_clear_delegation(struct nfs4_state *state)
1842 {
1843         write_seqlock(&state->seqlock);
1844         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1845         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1846         write_sequnlock(&state->seqlock);
1847 }
1848
1849 int update_open_stateid(struct nfs4_state *state,
1850                 const nfs4_stateid *open_stateid,
1851                 const nfs4_stateid *delegation,
1852                 fmode_t fmode)
1853 {
1854         struct nfs_server *server = NFS_SERVER(state->inode);
1855         struct nfs_client *clp = server->nfs_client;
1856         struct nfs_inode *nfsi = NFS_I(state->inode);
1857         struct nfs_delegation *deleg_cur;
1858         nfs4_stateid freeme = { };
1859         int ret = 0;
1860
1861         fmode &= (FMODE_READ|FMODE_WRITE);
1862
1863         rcu_read_lock();
1864         spin_lock(&state->owner->so_lock);
1865         if (open_stateid != NULL) {
1866                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1867                 ret = 1;
1868         }
1869
1870         deleg_cur = nfs4_get_valid_delegation(state->inode);
1871         if (deleg_cur == NULL)
1872                 goto no_delegation;
1873
1874         spin_lock(&deleg_cur->lock);
1875         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1876            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1877             (deleg_cur->type & fmode) != fmode)
1878                 goto no_delegation_unlock;
1879
1880         if (delegation == NULL)
1881                 delegation = &deleg_cur->stateid;
1882         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1883                 goto no_delegation_unlock;
1884
1885         nfs_mark_delegation_referenced(deleg_cur);
1886         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1887         ret = 1;
1888 no_delegation_unlock:
1889         spin_unlock(&deleg_cur->lock);
1890 no_delegation:
1891         if (ret)
1892                 update_open_stateflags(state, fmode);
1893         spin_unlock(&state->owner->so_lock);
1894         rcu_read_unlock();
1895
1896         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1897                 nfs4_schedule_state_manager(clp);
1898         if (freeme.type != 0)
1899                 nfs4_test_and_free_stateid(server, &freeme,
1900                                 state->owner->so_cred);
1901
1902         return ret;
1903 }
1904
1905 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1906                 const nfs4_stateid *stateid)
1907 {
1908         struct nfs4_state *state = lsp->ls_state;
1909         bool ret = false;
1910
1911         spin_lock(&state->state_lock);
1912         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1913                 goto out_noupdate;
1914         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1915                 goto out_noupdate;
1916         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1917         ret = true;
1918 out_noupdate:
1919         spin_unlock(&state->state_lock);
1920         return ret;
1921 }
1922
1923 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1924 {
1925         struct nfs_delegation *delegation;
1926
1927         fmode &= FMODE_READ|FMODE_WRITE;
1928         rcu_read_lock();
1929         delegation = nfs4_get_valid_delegation(inode);
1930         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1931                 rcu_read_unlock();
1932                 return;
1933         }
1934         rcu_read_unlock();
1935         nfs4_inode_return_delegation(inode);
1936 }
1937
1938 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1939 {
1940         struct nfs4_state *state = opendata->state;
1941         struct nfs_delegation *delegation;
1942         int open_mode = opendata->o_arg.open_flags;
1943         fmode_t fmode = opendata->o_arg.fmode;
1944         enum open_claim_type4 claim = opendata->o_arg.claim;
1945         nfs4_stateid stateid;
1946         int ret = -EAGAIN;
1947
1948         for (;;) {
1949                 spin_lock(&state->owner->so_lock);
1950                 if (can_open_cached(state, fmode, open_mode, claim)) {
1951                         update_open_stateflags(state, fmode);
1952                         spin_unlock(&state->owner->so_lock);
1953                         goto out_return_state;
1954                 }
1955                 spin_unlock(&state->owner->so_lock);
1956                 rcu_read_lock();
1957                 delegation = nfs4_get_valid_delegation(state->inode);
1958                 if (!can_open_delegated(delegation, fmode, claim)) {
1959                         rcu_read_unlock();
1960                         break;
1961                 }
1962                 /* Save the delegation */
1963                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1964                 rcu_read_unlock();
1965                 nfs_release_seqid(opendata->o_arg.seqid);
1966                 if (!opendata->is_recover) {
1967                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1968                         if (ret != 0)
1969                                 goto out;
1970                 }
1971                 ret = -EAGAIN;
1972
1973                 /* Try to update the stateid using the delegation */
1974                 if (update_open_stateid(state, NULL, &stateid, fmode))
1975                         goto out_return_state;
1976         }
1977 out:
1978         return ERR_PTR(ret);
1979 out_return_state:
1980         refcount_inc(&state->count);
1981         return state;
1982 }
1983
1984 static void
1985 nfs4_process_delegation(struct inode *inode, const struct cred *cred,
1986                         enum open_claim_type4 claim,
1987                         const struct nfs4_open_delegation *delegation)
1988 {
1989         switch (delegation->open_delegation_type) {
1990         case NFS4_OPEN_DELEGATE_READ:
1991         case NFS4_OPEN_DELEGATE_WRITE:
1992         case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
1993         case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
1994                 break;
1995         default:
1996                 return;
1997         }
1998         switch (claim) {
1999         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2000         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2001                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
2002                                    "returning a delegation for "
2003                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
2004                                    NFS_SERVER(inode)->nfs_client->cl_hostname);
2005                 break;
2006         case NFS4_OPEN_CLAIM_PREVIOUS:
2007                 nfs_inode_reclaim_delegation(inode, cred, delegation->type,
2008                                              &delegation->stateid,
2009                                              delegation->pagemod_limit,
2010                                              delegation->open_delegation_type);
2011                 break;
2012         default:
2013                 nfs_inode_set_delegation(inode, cred, delegation->type,
2014                                          &delegation->stateid,
2015                                          delegation->pagemod_limit,
2016                                          delegation->open_delegation_type);
2017         }
2018         if (delegation->do_recall)
2019                 nfs_async_inode_return_delegation(inode, &delegation->stateid);
2020 }
2021
2022 /*
2023  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
2024  * and update the nfs4_state.
2025  */
2026 static struct nfs4_state *
2027 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
2028 {
2029         struct inode *inode = data->state->inode;
2030         struct nfs4_state *state = data->state;
2031         int ret;
2032
2033         if (!data->rpc_done) {
2034                 if (data->rpc_status)
2035                         return ERR_PTR(data->rpc_status);
2036                 return nfs4_try_open_cached(data);
2037         }
2038
2039         ret = nfs_refresh_inode(inode, &data->f_attr);
2040         if (ret)
2041                 return ERR_PTR(ret);
2042
2043         nfs4_process_delegation(state->inode,
2044                                 data->owner->so_cred,
2045                                 data->o_arg.claim,
2046                                 &data->o_res.delegation);
2047
2048         if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2049                 if (!update_open_stateid(state, &data->o_res.stateid,
2050                                          NULL, data->o_arg.fmode))
2051                         return ERR_PTR(-EAGAIN);
2052         } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode))
2053                 return ERR_PTR(-EAGAIN);
2054         refcount_inc(&state->count);
2055
2056         return state;
2057 }
2058
2059 static struct inode *
2060 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2061 {
2062         struct inode *inode;
2063
2064         switch (data->o_arg.claim) {
2065         case NFS4_OPEN_CLAIM_NULL:
2066         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2067         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2068                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2069                         return ERR_PTR(-EAGAIN);
2070                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2071                                 &data->f_attr);
2072                 break;
2073         default:
2074                 inode = d_inode(data->dentry);
2075                 ihold(inode);
2076                 nfs_refresh_inode(inode, &data->f_attr);
2077         }
2078         return inode;
2079 }
2080
2081 static struct nfs4_state *
2082 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2083 {
2084         struct nfs4_state *state;
2085         struct inode *inode;
2086
2087         inode = nfs4_opendata_get_inode(data);
2088         if (IS_ERR(inode))
2089                 return ERR_CAST(inode);
2090         if (data->state != NULL && data->state->inode == inode) {
2091                 state = data->state;
2092                 refcount_inc(&state->count);
2093         } else
2094                 state = nfs4_get_open_state(inode, data->owner);
2095         iput(inode);
2096         if (state == NULL)
2097                 state = ERR_PTR(-ENOMEM);
2098         return state;
2099 }
2100
2101 static struct nfs4_state *
2102 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2103 {
2104         struct nfs4_state *state;
2105
2106         if (!data->rpc_done) {
2107                 state = nfs4_try_open_cached(data);
2108                 trace_nfs4_cached_open(data->state);
2109                 goto out;
2110         }
2111
2112         state = nfs4_opendata_find_nfs4_state(data);
2113         if (IS_ERR(state))
2114                 goto out;
2115
2116         nfs4_process_delegation(state->inode,
2117                                 data->owner->so_cred,
2118                                 data->o_arg.claim,
2119                                 &data->o_res.delegation);
2120
2121         if (!(data->o_res.rflags & NFS4_OPEN_RESULT_NO_OPEN_STATEID)) {
2122                 if (!update_open_stateid(state, &data->o_res.stateid,
2123                                          NULL, data->o_arg.fmode)) {
2124                         nfs4_put_open_state(state);
2125                         state = ERR_PTR(-EAGAIN);
2126                 }
2127         } else if (!update_open_stateid(state, NULL, NULL, data->o_arg.fmode)) {
2128                 nfs4_put_open_state(state);
2129                 state = ERR_PTR(-EAGAIN);
2130         }
2131 out:
2132         nfs_release_seqid(data->o_arg.seqid);
2133         return state;
2134 }
2135
2136 static struct nfs4_state *
2137 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2138 {
2139         struct nfs4_state *ret;
2140
2141         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2142                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2143         else
2144                 ret = _nfs4_opendata_to_nfs4_state(data);
2145         nfs4_sequence_free_slot(&data->o_res.seq_res);
2146         return ret;
2147 }
2148
2149 static struct nfs_open_context *
2150 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2151 {
2152         struct nfs_inode *nfsi = NFS_I(state->inode);
2153         struct nfs_open_context *ctx;
2154
2155         rcu_read_lock();
2156         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2157                 if (ctx->state != state)
2158                         continue;
2159                 if ((ctx->mode & mode) != mode)
2160                         continue;
2161                 if (!get_nfs_open_context(ctx))
2162                         continue;
2163                 rcu_read_unlock();
2164                 return ctx;
2165         }
2166         rcu_read_unlock();
2167         return ERR_PTR(-ENOENT);
2168 }
2169
2170 static struct nfs_open_context *
2171 nfs4_state_find_open_context(struct nfs4_state *state)
2172 {
2173         struct nfs_open_context *ctx;
2174
2175         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2176         if (!IS_ERR(ctx))
2177                 return ctx;
2178         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2179         if (!IS_ERR(ctx))
2180                 return ctx;
2181         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2182 }
2183
2184 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2185                 struct nfs4_state *state, enum open_claim_type4 claim)
2186 {
2187         struct nfs4_opendata *opendata;
2188
2189         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2190                         NULL, claim, GFP_NOFS);
2191         if (opendata == NULL)
2192                 return ERR_PTR(-ENOMEM);
2193         opendata->state = state;
2194         refcount_inc(&state->count);
2195         return opendata;
2196 }
2197
2198 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2199                                     fmode_t fmode)
2200 {
2201         struct nfs4_state *newstate;
2202         struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2203         int openflags = opendata->o_arg.open_flags;
2204         int ret;
2205
2206         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2207                 return 0;
2208         opendata->o_arg.fmode = fmode;
2209         opendata->o_arg.share_access =
2210                 nfs4_map_atomic_open_share(server, fmode, openflags);
2211         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2212         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2213         nfs4_init_opendata_res(opendata);
2214         ret = _nfs4_recover_proc_open(opendata);
2215         if (ret != 0)
2216                 return ret;
2217         newstate = nfs4_opendata_to_nfs4_state(opendata);
2218         if (IS_ERR(newstate))
2219                 return PTR_ERR(newstate);
2220         if (newstate != opendata->state)
2221                 ret = -ESTALE;
2222         nfs4_close_state(newstate, fmode);
2223         return ret;
2224 }
2225
2226 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2227 {
2228         int ret;
2229
2230         /* memory barrier prior to reading state->n_* */
2231         smp_rmb();
2232         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2233         if (ret != 0)
2234                 return ret;
2235         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2236         if (ret != 0)
2237                 return ret;
2238         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2239         if (ret != 0)
2240                 return ret;
2241         /*
2242          * We may have performed cached opens for all three recoveries.
2243          * Check if we need to update the current stateid.
2244          */
2245         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2246             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2247                 write_seqlock(&state->seqlock);
2248                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2249                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2250                 write_sequnlock(&state->seqlock);
2251         }
2252         return 0;
2253 }
2254
2255 /*
2256  * OPEN_RECLAIM:
2257  *      reclaim state on the server after a reboot.
2258  */
2259 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2260 {
2261         struct nfs_delegation *delegation;
2262         struct nfs4_opendata *opendata;
2263         u32 delegation_type = NFS4_OPEN_DELEGATE_NONE;
2264         int status;
2265
2266         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2267                         NFS4_OPEN_CLAIM_PREVIOUS);
2268         if (IS_ERR(opendata))
2269                 return PTR_ERR(opendata);
2270         rcu_read_lock();
2271         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2272         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) {
2273                 switch(delegation->type) {
2274                 case FMODE_READ:
2275                         delegation_type = NFS4_OPEN_DELEGATE_READ;
2276                         if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2277                                 delegation_type = NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG;
2278                         break;
2279                 case FMODE_WRITE:
2280                 case FMODE_READ|FMODE_WRITE:
2281                         delegation_type = NFS4_OPEN_DELEGATE_WRITE;
2282                         if (test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags))
2283                                 delegation_type = NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG;
2284                 }
2285         }
2286         rcu_read_unlock();
2287         opendata->o_arg.u.delegation_type = delegation_type;
2288         status = nfs4_open_recover(opendata, state);
2289         nfs4_opendata_put(opendata);
2290         return status;
2291 }
2292
2293 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2294 {
2295         struct nfs_server *server = NFS_SERVER(state->inode);
2296         struct nfs4_exception exception = { };
2297         int err;
2298         do {
2299                 err = _nfs4_do_open_reclaim(ctx, state);
2300                 trace_nfs4_open_reclaim(ctx, 0, err);
2301                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2302                         continue;
2303                 if (err != -NFS4ERR_DELAY)
2304                         break;
2305                 nfs4_handle_exception(server, err, &exception);
2306         } while (exception.retry);
2307         return err;
2308 }
2309
2310 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2311 {
2312         struct nfs_open_context *ctx;
2313         int ret;
2314
2315         ctx = nfs4_state_find_open_context(state);
2316         if (IS_ERR(ctx))
2317                 return -EAGAIN;
2318         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2319         nfs_state_clear_open_state_flags(state);
2320         ret = nfs4_do_open_reclaim(ctx, state);
2321         put_nfs_open_context(ctx);
2322         return ret;
2323 }
2324
2325 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2326 {
2327         switch (err) {
2328                 default:
2329                         printk(KERN_ERR "NFS: %s: unhandled error "
2330                                         "%d.\n", __func__, err);
2331                         fallthrough;
2332                 case 0:
2333                 case -ENOENT:
2334                 case -EAGAIN:
2335                 case -ESTALE:
2336                 case -ETIMEDOUT:
2337                         break;
2338                 case -NFS4ERR_BADSESSION:
2339                 case -NFS4ERR_BADSLOT:
2340                 case -NFS4ERR_BAD_HIGH_SLOT:
2341                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2342                 case -NFS4ERR_DEADSESSION:
2343                         return -EAGAIN;
2344                 case -NFS4ERR_STALE_CLIENTID:
2345                 case -NFS4ERR_STALE_STATEID:
2346                         /* Don't recall a delegation if it was lost */
2347                         nfs4_schedule_lease_recovery(server->nfs_client);
2348                         return -EAGAIN;
2349                 case -NFS4ERR_MOVED:
2350                         nfs4_schedule_migration_recovery(server);
2351                         return -EAGAIN;
2352                 case -NFS4ERR_LEASE_MOVED:
2353                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2354                         return -EAGAIN;
2355                 case -NFS4ERR_DELEG_REVOKED:
2356                 case -NFS4ERR_ADMIN_REVOKED:
2357                 case -NFS4ERR_EXPIRED:
2358                 case -NFS4ERR_BAD_STATEID:
2359                 case -NFS4ERR_OPENMODE:
2360                         nfs_inode_find_state_and_recover(state->inode,
2361                                         stateid);
2362                         nfs4_schedule_stateid_recovery(server, state);
2363                         return -EAGAIN;
2364                 case -NFS4ERR_DELAY:
2365                 case -NFS4ERR_GRACE:
2366                         ssleep(1);
2367                         return -EAGAIN;
2368                 case -ENOMEM:
2369                 case -NFS4ERR_DENIED:
2370                         if (fl) {
2371                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2372                                 if (lsp)
2373                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2374                         }
2375                         return 0;
2376         }
2377         return err;
2378 }
2379
2380 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2381                 struct nfs4_state *state, const nfs4_stateid *stateid)
2382 {
2383         struct nfs_server *server = NFS_SERVER(state->inode);
2384         struct nfs4_opendata *opendata;
2385         int err = 0;
2386
2387         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2388                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2389         if (IS_ERR(opendata))
2390                 return PTR_ERR(opendata);
2391         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2392         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2393                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2394                 if (err)
2395                         goto out;
2396         }
2397         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2398                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2399                 if (err)
2400                         goto out;
2401         }
2402         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2403                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2404                 if (err)
2405                         goto out;
2406         }
2407         nfs_state_clear_delegation(state);
2408 out:
2409         nfs4_opendata_put(opendata);
2410         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2411 }
2412
2413 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2414 {
2415         struct nfs4_opendata *data = calldata;
2416
2417         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2418                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2419 }
2420
2421 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2422 {
2423         struct nfs4_opendata *data = calldata;
2424
2425         nfs40_sequence_done(task, &data->c_res.seq_res);
2426
2427         data->rpc_status = task->tk_status;
2428         if (data->rpc_status == 0) {
2429                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2430                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2431                 renew_lease(data->o_res.server, data->timestamp);
2432                 data->rpc_done = true;
2433         }
2434 }
2435
2436 static void nfs4_open_confirm_release(void *calldata)
2437 {
2438         struct nfs4_opendata *data = calldata;
2439         struct nfs4_state *state = NULL;
2440
2441         /* If this request hasn't been cancelled, do nothing */
2442         if (!data->cancelled)
2443                 goto out_free;
2444         /* In case of error, no cleanup! */
2445         if (!data->rpc_done)
2446                 goto out_free;
2447         state = nfs4_opendata_to_nfs4_state(data);
2448         if (!IS_ERR(state))
2449                 nfs4_close_state(state, data->o_arg.fmode);
2450 out_free:
2451         nfs4_opendata_put(data);
2452 }
2453
2454 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2455         .rpc_call_prepare = nfs4_open_confirm_prepare,
2456         .rpc_call_done = nfs4_open_confirm_done,
2457         .rpc_release = nfs4_open_confirm_release,
2458 };
2459
2460 /*
2461  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2462  */
2463 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2464 {
2465         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2466         struct rpc_task *task;
2467         struct  rpc_message msg = {
2468                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2469                 .rpc_argp = &data->c_arg,
2470                 .rpc_resp = &data->c_res,
2471                 .rpc_cred = data->owner->so_cred,
2472         };
2473         struct rpc_task_setup task_setup_data = {
2474                 .rpc_client = server->client,
2475                 .rpc_message = &msg,
2476                 .callback_ops = &nfs4_open_confirm_ops,
2477                 .callback_data = data,
2478                 .workqueue = nfsiod_workqueue,
2479                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2480         };
2481         int status;
2482
2483         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2484                                 data->is_recover);
2485         kref_get(&data->kref);
2486         data->rpc_done = false;
2487         data->rpc_status = 0;
2488         data->timestamp = jiffies;
2489         task = rpc_run_task(&task_setup_data);
2490         if (IS_ERR(task))
2491                 return PTR_ERR(task);
2492         status = rpc_wait_for_completion_task(task);
2493         if (status != 0) {
2494                 data->cancelled = true;
2495                 smp_wmb();
2496         } else
2497                 status = data->rpc_status;
2498         rpc_put_task(task);
2499         return status;
2500 }
2501
2502 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2503 {
2504         struct nfs4_opendata *data = calldata;
2505         struct nfs4_state_owner *sp = data->owner;
2506         struct nfs_client *clp = sp->so_server->nfs_client;
2507         enum open_claim_type4 claim = data->o_arg.claim;
2508
2509         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2510                 goto out_wait;
2511         /*
2512          * Check if we still need to send an OPEN call, or if we can use
2513          * a delegation instead.
2514          */
2515         if (data->state != NULL) {
2516                 struct nfs_delegation *delegation;
2517
2518                 if (can_open_cached(data->state, data->o_arg.fmode,
2519                                         data->o_arg.open_flags, claim))
2520                         goto out_no_action;
2521                 rcu_read_lock();
2522                 delegation = nfs4_get_valid_delegation(data->state->inode);
2523                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2524                         goto unlock_no_action;
2525                 rcu_read_unlock();
2526         }
2527         /* Update client id. */
2528         data->o_arg.clientid = clp->cl_clientid;
2529         switch (claim) {
2530         default:
2531                 break;
2532         case NFS4_OPEN_CLAIM_PREVIOUS:
2533         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2534         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2535                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2536                 fallthrough;
2537         case NFS4_OPEN_CLAIM_FH:
2538                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2539         }
2540         data->timestamp = jiffies;
2541         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2542                                 &data->o_arg.seq_args,
2543                                 &data->o_res.seq_res,
2544                                 task) != 0)
2545                 nfs_release_seqid(data->o_arg.seqid);
2546
2547         /* Set the create mode (note dependency on the session type) */
2548         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2549         if (data->o_arg.open_flags & O_EXCL) {
2550                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2551                 if (clp->cl_mvops->minor_version == 0) {
2552                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2553                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2554                          * because ACCESS will return permission denied for
2555                          * all bits until close */
2556                         data->o_res.access_request = data->o_arg.access = 0;
2557                 } else if (nfs4_has_persistent_session(clp))
2558                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2559         }
2560         return;
2561 unlock_no_action:
2562         trace_nfs4_cached_open(data->state);
2563         rcu_read_unlock();
2564 out_no_action:
2565         task->tk_action = NULL;
2566 out_wait:
2567         nfs4_sequence_done(task, &data->o_res.seq_res);
2568 }
2569
2570 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2571 {
2572         struct nfs4_opendata *data = calldata;
2573
2574         data->rpc_status = task->tk_status;
2575
2576         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2577                 return;
2578
2579         if (task->tk_status == 0) {
2580                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2581                         switch (data->o_res.f_attr->mode & S_IFMT) {
2582                         case S_IFREG:
2583                                 break;
2584                         case S_IFLNK:
2585                                 data->rpc_status = -ELOOP;
2586                                 break;
2587                         case S_IFDIR:
2588                                 data->rpc_status = -EISDIR;
2589                                 break;
2590                         default:
2591                                 data->rpc_status = -ENOTDIR;
2592                         }
2593                 }
2594                 renew_lease(data->o_res.server, data->timestamp);
2595                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2596                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2597         }
2598         data->rpc_done = true;
2599 }
2600
2601 static void nfs4_open_release(void *calldata)
2602 {
2603         struct nfs4_opendata *data = calldata;
2604         struct nfs4_state *state = NULL;
2605
2606         /* If this request hasn't been cancelled, do nothing */
2607         if (!data->cancelled)
2608                 goto out_free;
2609         /* In case of error, no cleanup! */
2610         if (data->rpc_status != 0 || !data->rpc_done)
2611                 goto out_free;
2612         /* In case we need an open_confirm, no cleanup! */
2613         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2614                 goto out_free;
2615         state = nfs4_opendata_to_nfs4_state(data);
2616         if (!IS_ERR(state))
2617                 nfs4_close_state(state, data->o_arg.fmode);
2618 out_free:
2619         nfs4_opendata_put(data);
2620 }
2621
2622 static const struct rpc_call_ops nfs4_open_ops = {
2623         .rpc_call_prepare = nfs4_open_prepare,
2624         .rpc_call_done = nfs4_open_done,
2625         .rpc_release = nfs4_open_release,
2626 };
2627
2628 static int nfs4_run_open_task(struct nfs4_opendata *data,
2629                               struct nfs_open_context *ctx)
2630 {
2631         struct inode *dir = d_inode(data->dir);
2632         struct nfs_server *server = NFS_SERVER(dir);
2633         struct nfs_openargs *o_arg = &data->o_arg;
2634         struct nfs_openres *o_res = &data->o_res;
2635         struct rpc_task *task;
2636         struct rpc_message msg = {
2637                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2638                 .rpc_argp = o_arg,
2639                 .rpc_resp = o_res,
2640                 .rpc_cred = data->owner->so_cred,
2641         };
2642         struct rpc_task_setup task_setup_data = {
2643                 .rpc_client = server->client,
2644                 .rpc_message = &msg,
2645                 .callback_ops = &nfs4_open_ops,
2646                 .callback_data = data,
2647                 .workqueue = nfsiod_workqueue,
2648                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2649         };
2650         int status;
2651
2652         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2653                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2654
2655         kref_get(&data->kref);
2656         data->rpc_done = false;
2657         data->rpc_status = 0;
2658         data->cancelled = false;
2659         data->is_recover = false;
2660         if (!ctx) {
2661                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2662                 data->is_recover = true;
2663                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2664         } else {
2665                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2666                 pnfs_lgopen_prepare(data, ctx);
2667         }
2668         task = rpc_run_task(&task_setup_data);
2669         if (IS_ERR(task))
2670                 return PTR_ERR(task);
2671         status = rpc_wait_for_completion_task(task);
2672         if (status != 0) {
2673                 data->cancelled = true;
2674                 smp_wmb();
2675         } else
2676                 status = data->rpc_status;
2677         rpc_put_task(task);
2678
2679         return status;
2680 }
2681
2682 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2683 {
2684         struct inode *dir = d_inode(data->dir);
2685         struct nfs_openres *o_res = &data->o_res;
2686         int status;
2687
2688         status = nfs4_run_open_task(data, NULL);
2689         if (status != 0 || !data->rpc_done)
2690                 return status;
2691
2692         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2693
2694         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2695                 status = _nfs4_proc_open_confirm(data);
2696
2697         return status;
2698 }
2699
2700 /*
2701  * Additional permission checks in order to distinguish between an
2702  * open for read, and an open for execute. This works around the
2703  * fact that NFSv4 OPEN treats read and execute permissions as being
2704  * the same.
2705  * Note that in the non-execute case, we want to turn off permission
2706  * checking if we just created a new file (POSIX open() semantics).
2707  */
2708 static int nfs4_opendata_access(const struct cred *cred,
2709                                 struct nfs4_opendata *opendata,
2710                                 struct nfs4_state *state, fmode_t fmode)
2711 {
2712         struct nfs_access_entry cache;
2713         u32 mask, flags;
2714
2715         /* access call failed or for some reason the server doesn't
2716          * support any access modes -- defer access call until later */
2717         if (opendata->o_res.access_supported == 0)
2718                 return 0;
2719
2720         mask = 0;
2721         if (fmode & FMODE_EXEC) {
2722                 /* ONLY check for exec rights */
2723                 if (S_ISDIR(state->inode->i_mode))
2724                         mask = NFS4_ACCESS_LOOKUP;
2725                 else
2726                         mask = NFS4_ACCESS_EXECUTE;
2727         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2728                 mask = NFS4_ACCESS_READ;
2729
2730         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2731         nfs_access_add_cache(state->inode, &cache, cred);
2732
2733         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2734         if ((mask & ~cache.mask & flags) == 0)
2735                 return 0;
2736
2737         return -EACCES;
2738 }
2739
2740 /*
2741  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2742  */
2743 static int _nfs4_proc_open(struct nfs4_opendata *data,
2744                            struct nfs_open_context *ctx)
2745 {
2746         struct inode *dir = d_inode(data->dir);
2747         struct nfs_server *server = NFS_SERVER(dir);
2748         struct nfs_openargs *o_arg = &data->o_arg;
2749         struct nfs_openres *o_res = &data->o_res;
2750         int status;
2751
2752         status = nfs4_run_open_task(data, ctx);
2753         if (!data->rpc_done)
2754                 return status;
2755         if (status != 0) {
2756                 if (status == -NFS4ERR_BADNAME &&
2757                                 !(o_arg->open_flags & O_CREAT))
2758                         return -ENOENT;
2759                 return status;
2760         }
2761
2762         nfs_fattr_map_and_free_names(server, &data->f_attr);
2763
2764         if (o_arg->open_flags & O_CREAT) {
2765                 if (o_arg->open_flags & O_EXCL)
2766                         data->file_created = true;
2767                 else if (o_res->cinfo.before != o_res->cinfo.after)
2768                         data->file_created = true;
2769                 if (data->file_created ||
2770                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2771                         nfs4_update_changeattr(dir, &o_res->cinfo,
2772                                         o_res->f_attr->time_start,
2773                                         NFS_INO_INVALID_DATA);
2774         }
2775         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2776                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2777         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2778                 status = _nfs4_proc_open_confirm(data);
2779                 if (status != 0)
2780                         return status;
2781         }
2782         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2783                 struct nfs_fh *fh = &o_res->fh;
2784
2785                 nfs4_sequence_free_slot(&o_res->seq_res);
2786                 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2787                         fh = NFS_FH(d_inode(data->dentry));
2788                 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2789         }
2790         return 0;
2791 }
2792
2793 /*
2794  * OPEN_EXPIRED:
2795  *      reclaim state on the server after a network partition.
2796  *      Assumes caller holds the appropriate lock
2797  */
2798 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2799 {
2800         struct nfs4_opendata *opendata;
2801         int ret;
2802
2803         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2804         if (IS_ERR(opendata))
2805                 return PTR_ERR(opendata);
2806         /*
2807          * We're not recovering a delegation, so ask for no delegation.
2808          * Otherwise the recovery thread could deadlock with an outstanding
2809          * delegation return.
2810          */
2811         opendata->o_arg.open_flags = O_DIRECT;
2812         ret = nfs4_open_recover(opendata, state);
2813         if (ret == -ESTALE)
2814                 d_drop(ctx->dentry);
2815         nfs4_opendata_put(opendata);
2816         return ret;
2817 }
2818
2819 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2820 {
2821         struct nfs_server *server = NFS_SERVER(state->inode);
2822         struct nfs4_exception exception = { };
2823         int err;
2824
2825         do {
2826                 err = _nfs4_open_expired(ctx, state);
2827                 trace_nfs4_open_expired(ctx, 0, err);
2828                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2829                         continue;
2830                 switch (err) {
2831                 default:
2832                         goto out;
2833                 case -NFS4ERR_GRACE:
2834                 case -NFS4ERR_DELAY:
2835                         nfs4_handle_exception(server, err, &exception);
2836                         err = 0;
2837                 }
2838         } while (exception.retry);
2839 out:
2840         return err;
2841 }
2842
2843 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2844 {
2845         struct nfs_open_context *ctx;
2846         int ret;
2847
2848         ctx = nfs4_state_find_open_context(state);
2849         if (IS_ERR(ctx))
2850                 return -EAGAIN;
2851         ret = nfs4_do_open_expired(ctx, state);
2852         put_nfs_open_context(ctx);
2853         return ret;
2854 }
2855
2856 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2857                 const nfs4_stateid *stateid)
2858 {
2859         nfs_remove_bad_delegation(state->inode, stateid);
2860         nfs_state_clear_delegation(state);
2861 }
2862
2863 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2864 {
2865         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2866                 nfs_finish_clear_delegation_stateid(state, NULL);
2867 }
2868
2869 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2870 {
2871         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2872         nfs40_clear_delegation_stateid(state);
2873         nfs_state_clear_open_state_flags(state);
2874         return nfs4_open_expired(sp, state);
2875 }
2876
2877 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2878                                                const nfs4_stateid *stateid,
2879                                                const struct cred *cred)
2880 {
2881         return -NFS4ERR_BAD_STATEID;
2882 }
2883
2884 #if defined(CONFIG_NFS_V4_1)
2885 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2886                                                const nfs4_stateid *stateid,
2887                                                const struct cred *cred)
2888 {
2889         int status;
2890
2891         switch (stateid->type) {
2892         default:
2893                 break;
2894         case NFS4_INVALID_STATEID_TYPE:
2895         case NFS4_SPECIAL_STATEID_TYPE:
2896                 return -NFS4ERR_BAD_STATEID;
2897         case NFS4_REVOKED_STATEID_TYPE:
2898                 goto out_free;
2899         }
2900
2901         status = nfs41_test_stateid(server, stateid, cred);
2902         switch (status) {
2903         case -NFS4ERR_EXPIRED:
2904         case -NFS4ERR_ADMIN_REVOKED:
2905         case -NFS4ERR_DELEG_REVOKED:
2906                 break;
2907         default:
2908                 return status;
2909         }
2910 out_free:
2911         /* Ack the revoked state to the server */
2912         nfs41_free_stateid(server, stateid, cred, true);
2913         return -NFS4ERR_EXPIRED;
2914 }
2915
2916 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2917 {
2918         struct nfs_server *server = NFS_SERVER(state->inode);
2919         nfs4_stateid stateid;
2920         struct nfs_delegation *delegation;
2921         const struct cred *cred = NULL;
2922         int status, ret = NFS_OK;
2923
2924         /* Get the delegation credential for use by test/free_stateid */
2925         rcu_read_lock();
2926         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2927         if (delegation == NULL) {
2928                 rcu_read_unlock();
2929                 nfs_state_clear_delegation(state);
2930                 return NFS_OK;
2931         }
2932
2933         spin_lock(&delegation->lock);
2934         nfs4_stateid_copy(&stateid, &delegation->stateid);
2935
2936         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2937                                 &delegation->flags)) {
2938                 spin_unlock(&delegation->lock);
2939                 rcu_read_unlock();
2940                 return NFS_OK;
2941         }
2942
2943         if (delegation->cred)
2944                 cred = get_cred(delegation->cred);
2945         spin_unlock(&delegation->lock);
2946         rcu_read_unlock();
2947         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2948         trace_nfs4_test_delegation_stateid(state, NULL, status);
2949         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2950                 nfs_finish_clear_delegation_stateid(state, &stateid);
2951         else
2952                 ret = status;
2953
2954         put_cred(cred);
2955         return ret;
2956 }
2957
2958 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2959 {
2960         nfs4_stateid tmp;
2961
2962         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2963             nfs4_copy_delegation_stateid(state->inode, state->state,
2964                                 &tmp, NULL) &&
2965             nfs4_stateid_match_other(&state->stateid, &tmp))
2966                 nfs_state_set_delegation(state, &tmp, state->state);
2967         else
2968                 nfs_state_clear_delegation(state);
2969 }
2970
2971 /**
2972  * nfs41_check_expired_locks - possibly free a lock stateid
2973  *
2974  * @state: NFSv4 state for an inode
2975  *
2976  * Returns NFS_OK if recovery for this stateid is now finished.
2977  * Otherwise a negative NFS4ERR value is returned.
2978  */
2979 static int nfs41_check_expired_locks(struct nfs4_state *state)
2980 {
2981         int status, ret = NFS_OK;
2982         struct nfs4_lock_state *lsp, *prev = NULL;
2983         struct nfs_server *server = NFS_SERVER(state->inode);
2984
2985         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2986                 goto out;
2987
2988         spin_lock(&state->state_lock);
2989         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2990                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2991                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2992
2993                         refcount_inc(&lsp->ls_count);
2994                         spin_unlock(&state->state_lock);
2995
2996                         nfs4_put_lock_state(prev);
2997                         prev = lsp;
2998
2999                         status = nfs41_test_and_free_expired_stateid(server,
3000                                         &lsp->ls_stateid,
3001                                         cred);
3002                         trace_nfs4_test_lock_stateid(state, lsp, status);
3003                         if (status == -NFS4ERR_EXPIRED ||
3004                             status == -NFS4ERR_BAD_STATEID) {
3005                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
3006                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
3007                                 if (!recover_lost_locks)
3008                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
3009                         } else if (status != NFS_OK) {
3010                                 ret = status;
3011                                 nfs4_put_lock_state(prev);
3012                                 goto out;
3013                         }
3014                         spin_lock(&state->state_lock);
3015                 }
3016         }
3017         spin_unlock(&state->state_lock);
3018         nfs4_put_lock_state(prev);
3019 out:
3020         return ret;
3021 }
3022
3023 /**
3024  * nfs41_check_open_stateid - possibly free an open stateid
3025  *
3026  * @state: NFSv4 state for an inode
3027  *
3028  * Returns NFS_OK if recovery for this stateid is now finished.
3029  * Otherwise a negative NFS4ERR value is returned.
3030  */
3031 static int nfs41_check_open_stateid(struct nfs4_state *state)
3032 {
3033         struct nfs_server *server = NFS_SERVER(state->inode);
3034         nfs4_stateid *stateid = &state->open_stateid;
3035         const struct cred *cred = state->owner->so_cred;
3036         int status;
3037
3038         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
3039                 return -NFS4ERR_BAD_STATEID;
3040         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
3041         trace_nfs4_test_open_stateid(state, NULL, status);
3042         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
3043                 nfs_state_clear_open_state_flags(state);
3044                 stateid->type = NFS4_INVALID_STATEID_TYPE;
3045                 return status;
3046         }
3047         if (nfs_open_stateid_recover_openmode(state))
3048                 return -NFS4ERR_OPENMODE;
3049         return NFS_OK;
3050 }
3051
3052 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
3053 {
3054         int status;
3055
3056         status = nfs41_check_delegation_stateid(state);
3057         if (status != NFS_OK)
3058                 return status;
3059         nfs41_delegation_recover_stateid(state);
3060
3061         status = nfs41_check_expired_locks(state);
3062         if (status != NFS_OK)
3063                 return status;
3064         status = nfs41_check_open_stateid(state);
3065         if (status != NFS_OK)
3066                 status = nfs4_open_expired(sp, state);
3067         return status;
3068 }
3069 #endif
3070
3071 /*
3072  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3073  * fields corresponding to attributes that were used to store the verifier.
3074  * Make sure we clobber those fields in the later setattr call
3075  */
3076 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3077                                 struct iattr *sattr, struct nfs4_label **label)
3078 {
3079         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3080         __u32 attrset[3];
3081         unsigned ret;
3082         unsigned i;
3083
3084         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3085                 attrset[i] = opendata->o_res.attrset[i];
3086                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3087                         attrset[i] &= ~bitmask[i];
3088         }
3089
3090         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3091                 sattr->ia_valid : 0;
3092
3093         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3094                 if (sattr->ia_valid & ATTR_ATIME_SET)
3095                         ret |= ATTR_ATIME_SET;
3096                 else
3097                         ret |= ATTR_ATIME;
3098         }
3099
3100         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3101                 if (sattr->ia_valid & ATTR_MTIME_SET)
3102                         ret |= ATTR_MTIME_SET;
3103                 else
3104                         ret |= ATTR_MTIME;
3105         }
3106
3107         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3108                 *label = NULL;
3109         return ret;
3110 }
3111
3112 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3113                 struct nfs_open_context *ctx)
3114 {
3115         struct nfs4_state_owner *sp = opendata->owner;
3116         struct nfs_server *server = sp->so_server;
3117         struct dentry *dentry;
3118         struct nfs4_state *state;
3119         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3120         struct inode *dir = d_inode(opendata->dir);
3121         unsigned long dir_verifier;
3122         int ret;
3123
3124         dir_verifier = nfs_save_change_attribute(dir);
3125
3126         ret = _nfs4_proc_open(opendata, ctx);
3127         if (ret != 0)
3128                 goto out;
3129
3130         state = _nfs4_opendata_to_nfs4_state(opendata);
3131         ret = PTR_ERR(state);
3132         if (IS_ERR(state))
3133                 goto out;
3134         ctx->state = state;
3135         if (server->caps & NFS_CAP_POSIX_LOCK)
3136                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3137         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3138                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3139         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3140                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3141
3142         dentry = opendata->dentry;
3143         if (d_really_is_negative(dentry)) {
3144                 struct dentry *alias;
3145                 d_drop(dentry);
3146                 alias = d_exact_alias(dentry, state->inode);
3147                 if (!alias)
3148                         alias = d_splice_alias(igrab(state->inode), dentry);
3149                 /* d_splice_alias() can't fail here - it's a non-directory */
3150                 if (alias) {
3151                         dput(ctx->dentry);
3152                         ctx->dentry = dentry = alias;
3153                 }
3154         }
3155
3156         switch(opendata->o_arg.claim) {
3157         default:
3158                 break;
3159         case NFS4_OPEN_CLAIM_NULL:
3160         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3161         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3162                 if (!opendata->rpc_done)
3163                         break;
3164                 if (opendata->o_res.delegation.type != 0)
3165                         dir_verifier = nfs_save_change_attribute(dir);
3166                 nfs_set_verifier(dentry, dir_verifier);
3167         }
3168
3169         /* Parse layoutget results before we check for access */
3170         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3171
3172         ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3173         if (ret != 0)
3174                 goto out;
3175
3176         if (d_inode(dentry) == state->inode)
3177                 nfs_inode_attach_open_context(ctx);
3178
3179 out:
3180         if (!opendata->cancelled) {
3181                 if (opendata->lgp) {
3182                         nfs4_lgopen_release(opendata->lgp);
3183                         opendata->lgp = NULL;
3184                 }
3185                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3186         }
3187         return ret;
3188 }
3189
3190 /*
3191  * Returns a referenced nfs4_state
3192  */
3193 static int _nfs4_do_open(struct inode *dir,
3194                         struct nfs_open_context *ctx,
3195                         int flags,
3196                         const struct nfs4_open_createattrs *c,
3197                         int *opened)
3198 {
3199         struct nfs4_state_owner  *sp;
3200         struct nfs4_state     *state = NULL;
3201         struct nfs_server       *server = NFS_SERVER(dir);
3202         struct nfs4_opendata *opendata;
3203         struct dentry *dentry = ctx->dentry;
3204         const struct cred *cred = ctx->cred;
3205         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3206         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3207         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3208         struct iattr *sattr = c->sattr;
3209         struct nfs4_label *label = c->label;
3210         int status;
3211
3212         /* Protect against reboot recovery conflicts */
3213         status = -ENOMEM;
3214         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3215         if (sp == NULL) {
3216                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3217                 goto out_err;
3218         }
3219         status = nfs4_client_recover_expired_lease(server->nfs_client);
3220         if (status != 0)
3221                 goto err_put_state_owner;
3222         if (d_really_is_positive(dentry))
3223                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3224         status = -ENOMEM;
3225         if (d_really_is_positive(dentry))
3226                 claim = NFS4_OPEN_CLAIM_FH;
3227         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3228                         c, claim, GFP_KERNEL);
3229         if (opendata == NULL)
3230                 goto err_put_state_owner;
3231
3232         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3233                 if (!opendata->f_attr.mdsthreshold) {
3234                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3235                         if (!opendata->f_attr.mdsthreshold)
3236                                 goto err_opendata_put;
3237                 }
3238                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3239         }
3240         if (d_really_is_positive(dentry))
3241                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3242
3243         status = _nfs4_open_and_get_state(opendata, ctx);
3244         if (status != 0)
3245                 goto err_opendata_put;
3246         state = ctx->state;
3247
3248         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3249             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3250                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3251                 /*
3252                  * send create attributes which was not set by open
3253                  * with an extra setattr.
3254                  */
3255                 if (attrs || label) {
3256                         unsigned ia_old = sattr->ia_valid;
3257
3258                         sattr->ia_valid = attrs;
3259                         nfs_fattr_init(opendata->o_res.f_attr);
3260                         status = nfs4_do_setattr(state->inode, cred,
3261                                         opendata->o_res.f_attr, sattr,
3262                                         ctx, label);
3263                         if (status == 0) {
3264                                 nfs_setattr_update_inode(state->inode, sattr,
3265                                                 opendata->o_res.f_attr);
3266                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3267                         }
3268                         sattr->ia_valid = ia_old;
3269                 }
3270         }
3271         if (opened && opendata->file_created)
3272                 *opened = 1;
3273
3274         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3275                 *ctx_th = opendata->f_attr.mdsthreshold;
3276                 opendata->f_attr.mdsthreshold = NULL;
3277         }
3278
3279         nfs4_opendata_put(opendata);
3280         nfs4_put_state_owner(sp);
3281         return 0;
3282 err_opendata_put:
3283         nfs4_opendata_put(opendata);
3284 err_put_state_owner:
3285         nfs4_put_state_owner(sp);
3286 out_err:
3287         return status;
3288 }
3289
3290
3291 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3292                                         struct nfs_open_context *ctx,
3293                                         int flags,
3294                                         struct iattr *sattr,
3295                                         struct nfs4_label *label,
3296                                         int *opened)
3297 {
3298         struct nfs_server *server = NFS_SERVER(dir);
3299         struct nfs4_exception exception = {
3300                 .interruptible = true,
3301         };
3302         struct nfs4_state *res;
3303         struct nfs4_open_createattrs c = {
3304                 .label = label,
3305                 .sattr = sattr,
3306                 .verf = {
3307                         [0] = (__u32)jiffies,
3308                         [1] = (__u32)current->pid,
3309                 },
3310         };
3311         int status;
3312
3313         do {
3314                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3315                 res = ctx->state;
3316                 trace_nfs4_open_file(ctx, flags, status);
3317                 if (status == 0)
3318                         break;
3319                 /* NOTE: BAD_SEQID means the server and client disagree about the
3320                  * book-keeping w.r.t. state-changing operations
3321                  * (OPEN/CLOSE/LOCK/LOCKU...)
3322                  * It is actually a sign of a bug on the client or on the server.
3323                  *
3324                  * If we receive a BAD_SEQID error in the particular case of
3325                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3326                  * have unhashed the old state_owner for us, and that we can
3327                  * therefore safely retry using a new one. We should still warn
3328                  * the user though...
3329                  */
3330                 if (status == -NFS4ERR_BAD_SEQID) {
3331                         pr_warn_ratelimited("NFS: v4 server %s "
3332                                         " returned a bad sequence-id error!\n",
3333                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3334                         exception.retry = 1;
3335                         continue;
3336                 }
3337                 /*
3338                  * BAD_STATEID on OPEN means that the server cancelled our
3339                  * state before it received the OPEN_CONFIRM.
3340                  * Recover by retrying the request as per the discussion
3341                  * on Page 181 of RFC3530.
3342                  */
3343                 if (status == -NFS4ERR_BAD_STATEID) {
3344                         exception.retry = 1;
3345                         continue;
3346                 }
3347                 if (status == -NFS4ERR_EXPIRED) {
3348                         nfs4_schedule_lease_recovery(server->nfs_client);
3349                         exception.retry = 1;
3350                         continue;
3351                 }
3352                 if (status == -EAGAIN) {
3353                         /* We must have found a delegation */
3354                         exception.retry = 1;
3355                         continue;
3356                 }
3357                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3358                         continue;
3359                 res = ERR_PTR(nfs4_handle_exception(server,
3360                                         status, &exception));
3361         } while (exception.retry);
3362         return res;
3363 }
3364
3365 static int _nfs4_do_setattr(struct inode *inode,
3366                             struct nfs_setattrargs *arg,
3367                             struct nfs_setattrres *res,
3368                             const struct cred *cred,
3369                             struct nfs_open_context *ctx)
3370 {
3371         struct nfs_server *server = NFS_SERVER(inode);
3372         struct rpc_message msg = {
3373                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3374                 .rpc_argp       = arg,
3375                 .rpc_resp       = res,
3376                 .rpc_cred       = cred,
3377         };
3378         const struct cred *delegation_cred = NULL;
3379         unsigned long timestamp = jiffies;
3380         bool truncate;
3381         int status;
3382
3383         nfs_fattr_init(res->fattr);
3384
3385         /* Servers should only apply open mode checks for file size changes */
3386         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3387         if (!truncate) {
3388                 nfs4_inode_make_writeable(inode);
3389                 goto zero_stateid;
3390         }
3391
3392         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3393                 /* Use that stateid */
3394         } else if (ctx != NULL && ctx->state) {
3395                 struct nfs_lock_context *l_ctx;
3396                 if (!nfs4_valid_open_stateid(ctx->state))
3397                         return -EBADF;
3398                 l_ctx = nfs_get_lock_context(ctx);
3399                 if (IS_ERR(l_ctx))
3400                         return PTR_ERR(l_ctx);
3401                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3402                                                 &arg->stateid, &delegation_cred);
3403                 nfs_put_lock_context(l_ctx);
3404                 if (status == -EIO)
3405                         return -EBADF;
3406                 else if (status == -EAGAIN)
3407                         goto zero_stateid;
3408         } else {
3409 zero_stateid:
3410                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3411         }
3412         if (delegation_cred)
3413                 msg.rpc_cred = delegation_cred;
3414
3415         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3416
3417         put_cred(delegation_cred);
3418         if (status == 0 && ctx != NULL)
3419                 renew_lease(server, timestamp);
3420         trace_nfs4_setattr(inode, &arg->stateid, status);
3421         return status;
3422 }
3423
3424 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3425                            struct nfs_fattr *fattr, struct iattr *sattr,
3426                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3427 {
3428         struct nfs_server *server = NFS_SERVER(inode);
3429         __u32 bitmask[NFS4_BITMASK_SZ];
3430         struct nfs4_state *state = ctx ? ctx->state : NULL;
3431         struct nfs_setattrargs  arg = {
3432                 .fh             = NFS_FH(inode),
3433                 .iap            = sattr,
3434                 .server         = server,
3435                 .bitmask = bitmask,
3436                 .label          = ilabel,
3437         };
3438         struct nfs_setattrres  res = {
3439                 .fattr          = fattr,
3440                 .server         = server,
3441         };
3442         struct nfs4_exception exception = {
3443                 .state = state,
3444                 .inode = inode,
3445                 .stateid = &arg.stateid,
3446         };
3447         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE |
3448                                      NFS_INO_INVALID_CTIME;
3449         int err;
3450
3451         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3452                 adjust_flags |= NFS_INO_INVALID_MODE;
3453         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3454                 adjust_flags |= NFS_INO_INVALID_OTHER;
3455
3456         do {
3457                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3458                                         inode, adjust_flags);
3459
3460                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3461                 switch (err) {
3462                 case -NFS4ERR_OPENMODE:
3463                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3464                                 pr_warn_once("NFSv4: server %s is incorrectly "
3465                                                 "applying open mode checks to "
3466                                                 "a SETATTR that is not "
3467                                                 "changing file size.\n",
3468                                                 server->nfs_client->cl_hostname);
3469                         }
3470                         if (state && !(state->state & FMODE_WRITE)) {
3471                                 err = -EBADF;
3472                                 if (sattr->ia_valid & ATTR_OPEN)
3473                                         err = -EACCES;
3474                                 goto out;
3475                         }
3476                 }
3477                 err = nfs4_handle_exception(server, err, &exception);
3478         } while (exception.retry);
3479 out:
3480         return err;
3481 }
3482
3483 static bool
3484 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3485 {
3486         if (inode == NULL || !nfs_have_layout(inode))
3487                 return false;
3488
3489         return pnfs_wait_on_layoutreturn(inode, task);
3490 }
3491
3492 /*
3493  * Update the seqid of an open stateid
3494  */
3495 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3496                 struct nfs4_state *state)
3497 {
3498         __be32 seqid_open;
3499         u32 dst_seqid;
3500         int seq;
3501
3502         for (;;) {
3503                 if (!nfs4_valid_open_stateid(state))
3504                         break;
3505                 seq = read_seqbegin(&state->seqlock);
3506                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3507                         nfs4_stateid_copy(dst, &state->open_stateid);
3508                         if (read_seqretry(&state->seqlock, seq))
3509                                 continue;
3510                         break;
3511                 }
3512                 seqid_open = state->open_stateid.seqid;
3513                 if (read_seqretry(&state->seqlock, seq))
3514                         continue;
3515
3516                 dst_seqid = be32_to_cpu(dst->seqid);
3517                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3518                         dst->seqid = seqid_open;
3519                 break;
3520         }
3521 }
3522
3523 /*
3524  * Update the seqid of an open stateid after receiving
3525  * NFS4ERR_OLD_STATEID
3526  */
3527 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3528                 struct nfs4_state *state)
3529 {
3530         __be32 seqid_open;
3531         u32 dst_seqid;
3532         bool ret;
3533         int seq, status = -EAGAIN;
3534         DEFINE_WAIT(wait);
3535
3536         for (;;) {
3537                 ret = false;
3538                 if (!nfs4_valid_open_stateid(state))
3539                         break;
3540                 seq = read_seqbegin(&state->seqlock);
3541                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3542                         if (read_seqretry(&state->seqlock, seq))
3543                                 continue;
3544                         break;
3545                 }
3546
3547                 write_seqlock(&state->seqlock);
3548                 seqid_open = state->open_stateid.seqid;
3549
3550                 dst_seqid = be32_to_cpu(dst->seqid);
3551
3552                 /* Did another OPEN bump the state's seqid?  try again: */
3553                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3554                         dst->seqid = seqid_open;
3555                         write_sequnlock(&state->seqlock);
3556                         ret = true;
3557                         break;
3558                 }
3559
3560                 /* server says we're behind but we haven't seen the update yet */
3561                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3562                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3563                 write_sequnlock(&state->seqlock);
3564                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3565
3566                 if (fatal_signal_pending(current))
3567                         status = -EINTR;
3568                 else
3569                         if (schedule_timeout(5*HZ) != 0)
3570                                 status = 0;
3571
3572                 finish_wait(&state->waitq, &wait);
3573
3574                 if (!status)
3575                         continue;
3576                 if (status == -EINTR)
3577                         break;
3578
3579                 /* we slept the whole 5 seconds, we must have lost a seqid */
3580                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3581                 ret = true;
3582                 break;
3583         }
3584
3585         return ret;
3586 }
3587
3588 struct nfs4_closedata {
3589         struct inode *inode;
3590         struct nfs4_state *state;
3591         struct nfs_closeargs arg;
3592         struct nfs_closeres res;
3593         struct {
3594                 struct nfs4_layoutreturn_args arg;
3595                 struct nfs4_layoutreturn_res res;
3596                 struct nfs4_xdr_opaque_data ld_private;
3597                 u32 roc_barrier;
3598                 bool roc;
3599         } lr;
3600         struct nfs_fattr fattr;
3601         unsigned long timestamp;
3602 };
3603
3604 static void nfs4_free_closedata(void *data)
3605 {
3606         struct nfs4_closedata *calldata = data;
3607         struct nfs4_state_owner *sp = calldata->state->owner;
3608         struct super_block *sb = calldata->state->inode->i_sb;
3609
3610         if (calldata->lr.roc)
3611                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3612                                 calldata->res.lr_ret);
3613         nfs4_put_open_state(calldata->state);
3614         nfs_free_seqid(calldata->arg.seqid);
3615         nfs4_put_state_owner(sp);
3616         nfs_sb_deactive(sb);
3617         kfree(calldata);
3618 }
3619
3620 static void nfs4_close_done(struct rpc_task *task, void *data)
3621 {
3622         struct nfs4_closedata *calldata = data;
3623         struct nfs4_state *state = calldata->state;
3624         struct nfs_server *server = NFS_SERVER(calldata->inode);
3625         nfs4_stateid *res_stateid = NULL;
3626         struct nfs4_exception exception = {
3627                 .state = state,
3628                 .inode = calldata->inode,
3629                 .stateid = &calldata->arg.stateid,
3630         };
3631
3632         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3633                 return;
3634         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3635
3636         /* Handle Layoutreturn errors */
3637         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3638                           &calldata->res.lr_ret) == -EAGAIN)
3639                 goto out_restart;
3640
3641         /* hmm. we are done with the inode, and in the process of freeing
3642          * the state_owner. we keep this around to process errors
3643          */
3644         switch (task->tk_status) {
3645                 case 0:
3646                         res_stateid = &calldata->res.stateid;
3647                         renew_lease(server, calldata->timestamp);
3648                         break;
3649                 case -NFS4ERR_ACCESS:
3650                         if (calldata->arg.bitmask != NULL) {
3651                                 calldata->arg.bitmask = NULL;
3652                                 calldata->res.fattr = NULL;
3653                                 goto out_restart;
3654
3655                         }
3656                         break;
3657                 case -NFS4ERR_OLD_STATEID:
3658                         /* Did we race with OPEN? */
3659                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3660                                                 state))
3661                                 goto out_restart;
3662                         goto out_release;
3663                 case -NFS4ERR_ADMIN_REVOKED:
3664                 case -NFS4ERR_STALE_STATEID:
3665                 case -NFS4ERR_EXPIRED:
3666                         nfs4_free_revoked_stateid(server,
3667                                         &calldata->arg.stateid,
3668                                         task->tk_msg.rpc_cred);
3669                         fallthrough;
3670                 case -NFS4ERR_BAD_STATEID:
3671                         if (calldata->arg.fmode == 0)
3672                                 break;
3673                         fallthrough;
3674                 default:
3675                         task->tk_status = nfs4_async_handle_exception(task,
3676                                         server, task->tk_status, &exception);
3677                         if (exception.retry)
3678                                 goto out_restart;
3679         }
3680         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3681                         res_stateid, calldata->arg.fmode);
3682 out_release:
3683         task->tk_status = 0;
3684         nfs_release_seqid(calldata->arg.seqid);
3685         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3686         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3687         return;
3688 out_restart:
3689         task->tk_status = 0;
3690         rpc_restart_call_prepare(task);
3691         goto out_release;
3692 }
3693
3694 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3695 {
3696         struct nfs4_closedata *calldata = data;
3697         struct nfs4_state *state = calldata->state;
3698         struct inode *inode = calldata->inode;
3699         struct nfs_server *server = NFS_SERVER(inode);
3700         struct pnfs_layout_hdr *lo;
3701         bool is_rdonly, is_wronly, is_rdwr;
3702         int call_close = 0;
3703
3704         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3705                 goto out_wait;
3706
3707         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3708         spin_lock(&state->owner->so_lock);
3709         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3710         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3711         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3712         /* Calculate the change in open mode */
3713         calldata->arg.fmode = 0;
3714         if (state->n_rdwr == 0) {
3715                 if (state->n_rdonly == 0)
3716                         call_close |= is_rdonly;
3717                 else if (is_rdonly)
3718                         calldata->arg.fmode |= FMODE_READ;
3719                 if (state->n_wronly == 0)
3720                         call_close |= is_wronly;
3721                 else if (is_wronly)
3722                         calldata->arg.fmode |= FMODE_WRITE;
3723                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3724                         call_close |= is_rdwr;
3725         } else if (is_rdwr)
3726                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3727
3728         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3729         if (!nfs4_valid_open_stateid(state))
3730                 call_close = 0;
3731         spin_unlock(&state->owner->so_lock);
3732
3733         if (!call_close) {
3734                 /* Note: exit _without_ calling nfs4_close_done */
3735                 goto out_no_action;
3736         }
3737
3738         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3739                 nfs_release_seqid(calldata->arg.seqid);
3740                 goto out_wait;
3741         }
3742
3743         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3744         if (lo && !pnfs_layout_is_valid(lo)) {
3745                 calldata->arg.lr_args = NULL;
3746                 calldata->res.lr_res = NULL;
3747         }
3748
3749         if (calldata->arg.fmode == 0)
3750                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3751
3752         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3753                 /* Close-to-open cache consistency revalidation */
3754                 if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
3755                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3756                                          server->cache_consistency_bitmask,
3757                                          inode, 0);
3758                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3759                 } else
3760                         calldata->arg.bitmask = NULL;
3761         }
3762
3763         calldata->arg.share_access =
3764                 nfs4_fmode_to_share_access(calldata->arg.fmode);
3765
3766         if (calldata->res.fattr == NULL)
3767                 calldata->arg.bitmask = NULL;
3768         else if (calldata->arg.bitmask == NULL)
3769                 calldata->res.fattr = NULL;
3770         calldata->timestamp = jiffies;
3771         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3772                                 &calldata->arg.seq_args,
3773                                 &calldata->res.seq_res,
3774                                 task) != 0)
3775                 nfs_release_seqid(calldata->arg.seqid);
3776         return;
3777 out_no_action:
3778         task->tk_action = NULL;
3779 out_wait:
3780         nfs4_sequence_done(task, &calldata->res.seq_res);
3781 }
3782
3783 static const struct rpc_call_ops nfs4_close_ops = {
3784         .rpc_call_prepare = nfs4_close_prepare,
3785         .rpc_call_done = nfs4_close_done,
3786         .rpc_release = nfs4_free_closedata,
3787 };
3788
3789 /*
3790  * It is possible for data to be read/written from a mem-mapped file
3791  * after the sys_close call (which hits the vfs layer as a flush).
3792  * This means that we can't safely call nfsv4 close on a file until
3793  * the inode is cleared. This in turn means that we are not good
3794  * NFSv4 citizens - we do not indicate to the server to update the file's
3795  * share state even when we are done with one of the three share
3796  * stateid's in the inode.
3797  *
3798  * NOTE: Caller must be holding the sp->so_owner semaphore!
3799  */
3800 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3801 {
3802         struct nfs_server *server = NFS_SERVER(state->inode);
3803         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3804         struct nfs4_closedata *calldata;
3805         struct nfs4_state_owner *sp = state->owner;
3806         struct rpc_task *task;
3807         struct rpc_message msg = {
3808                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3809                 .rpc_cred = state->owner->so_cred,
3810         };
3811         struct rpc_task_setup task_setup_data = {
3812                 .rpc_client = server->client,
3813                 .rpc_message = &msg,
3814                 .callback_ops = &nfs4_close_ops,
3815                 .workqueue = nfsiod_workqueue,
3816                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3817         };
3818         int status = -ENOMEM;
3819
3820         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3821                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3822
3823         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3824                 &task_setup_data.rpc_client, &msg);
3825
3826         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3827         if (calldata == NULL)
3828                 goto out;
3829         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3830         calldata->inode = state->inode;
3831         calldata->state = state;
3832         calldata->arg.fh = NFS_FH(state->inode);
3833         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3834                 goto out_free_calldata;
3835         /* Serialization for the sequence id */
3836         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3837         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3838         if (IS_ERR(calldata->arg.seqid))
3839                 goto out_free_calldata;
3840         nfs_fattr_init(&calldata->fattr);
3841         calldata->arg.fmode = 0;
3842         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3843         calldata->res.fattr = &calldata->fattr;
3844         calldata->res.seqid = calldata->arg.seqid;
3845         calldata->res.server = server;
3846         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3847         calldata->lr.roc = pnfs_roc(state->inode,
3848                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3849         if (calldata->lr.roc) {
3850                 calldata->arg.lr_args = &calldata->lr.arg;
3851                 calldata->res.lr_res = &calldata->lr.res;
3852         }
3853         nfs_sb_active(calldata->inode->i_sb);
3854
3855         msg.rpc_argp = &calldata->arg;
3856         msg.rpc_resp = &calldata->res;
3857         task_setup_data.callback_data = calldata;
3858         task = rpc_run_task(&task_setup_data);
3859         if (IS_ERR(task))
3860                 return PTR_ERR(task);
3861         status = 0;
3862         if (wait)
3863                 status = rpc_wait_for_completion_task(task);
3864         rpc_put_task(task);
3865         return status;
3866 out_free_calldata:
3867         kfree(calldata);
3868 out:
3869         nfs4_put_open_state(state);
3870         nfs4_put_state_owner(sp);
3871         return status;
3872 }
3873
3874 static struct inode *
3875 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3876                 int open_flags, struct iattr *attr, int *opened)
3877 {
3878         struct nfs4_state *state;
3879         struct nfs4_label l, *label;
3880
3881         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3882
3883         /* Protect against concurrent sillydeletes */
3884         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3885
3886         nfs4_label_release_security(label);
3887
3888         if (IS_ERR(state))
3889                 return ERR_CAST(state);
3890         return state->inode;
3891 }
3892
3893 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3894 {
3895         if (ctx->state == NULL)
3896                 return;
3897         if (is_sync)
3898                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3899         else
3900                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3901 }
3902
3903 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3904 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3905 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_OPEN_ARGUMENTS - 1UL)
3906
3907 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3908 {
3909         u32 minorversion = server->nfs_client->cl_minorversion;
3910         u32 bitmask[3] = {
3911                 [0] = FATTR4_WORD0_SUPPORTED_ATTRS,
3912         };
3913         struct nfs4_server_caps_arg args = {
3914                 .fhandle = fhandle,
3915                 .bitmask = bitmask,
3916         };
3917         struct nfs4_server_caps_res res = {};
3918         struct rpc_message msg = {
3919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3920                 .rpc_argp = &args,
3921                 .rpc_resp = &res,
3922         };
3923         int status;
3924         int i;
3925
3926         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3927                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3928                      FATTR4_WORD0_LINK_SUPPORT |
3929                      FATTR4_WORD0_SYMLINK_SUPPORT |
3930                      FATTR4_WORD0_ACLSUPPORT |
3931                      FATTR4_WORD0_CASE_INSENSITIVE |
3932                      FATTR4_WORD0_CASE_PRESERVING;
3933         if (minorversion)
3934                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT |
3935                              FATTR4_WORD2_OPEN_ARGUMENTS;
3936
3937         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3938         if (status == 0) {
3939                 bitmask[0] = (FATTR4_WORD0_SUPPORTED_ATTRS |
3940                               FATTR4_WORD0_FH_EXPIRE_TYPE |
3941                               FATTR4_WORD0_LINK_SUPPORT |
3942                               FATTR4_WORD0_SYMLINK_SUPPORT |
3943                               FATTR4_WORD0_ACLSUPPORT |
3944                               FATTR4_WORD0_CASE_INSENSITIVE |
3945                               FATTR4_WORD0_CASE_PRESERVING) &
3946                              res.attr_bitmask[0];
3947                 /* Sanity check the server answers */
3948                 switch (minorversion) {
3949                 case 0:
3950                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3951                         res.attr_bitmask[2] = 0;
3952                         break;
3953                 case 1:
3954                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3955                         bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT &
3956                                      res.attr_bitmask[2];
3957                         break;
3958                 case 2:
3959                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3960                         bitmask[2] = (FATTR4_WORD2_SUPPATTR_EXCLCREAT |
3961                                       FATTR4_WORD2_OPEN_ARGUMENTS) &
3962                                      res.attr_bitmask[2];
3963                 }
3964                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3965                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3966                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3967                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3968                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3969                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3970                         server->caps |= NFS_CAP_ACLS;
3971                 if (res.has_links != 0)
3972                         server->caps |= NFS_CAP_HARDLINKS;
3973                 if (res.has_symlinks != 0)
3974                         server->caps |= NFS_CAP_SYMLINKS;
3975                 if (res.case_insensitive)
3976                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3977                 if (res.case_preserving)
3978                         server->caps |= NFS_CAP_CASE_PRESERVING;
3979 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3980                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3981                         server->caps |= NFS_CAP_SECURITY_LABEL;
3982 #endif
3983                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3984                         server->caps |= NFS_CAP_FS_LOCATIONS;
3985                 if (res.attr_bitmask[2] & FATTR4_WORD2_TIME_DELEG_MODIFY)
3986                         server->caps |= NFS_CAP_DELEGTIME;
3987                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3988                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3989                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3990                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3991                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3992                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3993                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3994                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3995                                 NFS_ATTR_FATTR_OWNER_NAME);
3996                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3997                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3998                                 NFS_ATTR_FATTR_GROUP_NAME);
3999                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
4000                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
4001                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
4002                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
4003                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
4004                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
4005                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
4006                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
4007                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
4008                                 sizeof(server->attr_bitmask));
4009                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4010
4011                 if (res.open_caps.oa_share_access_want[0] &
4012                     NFS4_SHARE_WANT_OPEN_XOR_DELEGATION)
4013                         server->caps |= NFS_CAP_OPEN_XOR;
4014
4015                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
4016                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
4017                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
4018                 server->cache_consistency_bitmask[2] = 0;
4019
4020                 /* Avoid a regression due to buggy server */
4021                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
4022                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
4023                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
4024                         sizeof(server->exclcreat_bitmask));
4025
4026                 server->acl_bitmask = res.acl_bitmask;
4027                 server->fh_expire_type = res.fh_expire_type;
4028         }
4029
4030         return status;
4031 }
4032
4033 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
4034 {
4035         struct nfs4_exception exception = {
4036                 .interruptible = true,
4037         };
4038         int err;
4039
4040         nfs4_server_set_init_caps(server);
4041         do {
4042                 err = nfs4_handle_exception(server,
4043                                 _nfs4_server_capabilities(server, fhandle),
4044                                 &exception);
4045         } while (exception.retry);
4046         return err;
4047 }
4048
4049 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
4050                                           struct nfs_client *clp,
4051                                           struct nfs_server *server)
4052 {
4053         int i;
4054
4055         for (i = 0; i < location->nservers; i++) {
4056                 struct nfs4_string *srv_loc = &location->servers[i];
4057                 struct sockaddr_storage addr;
4058                 size_t addrlen;
4059                 struct xprt_create xprt_args = {
4060                         .ident = 0,
4061                         .net = clp->cl_net,
4062                 };
4063                 struct nfs4_add_xprt_data xprtdata = {
4064                         .clp = clp,
4065                 };
4066                 struct rpc_add_xprt_test rpcdata = {
4067                         .add_xprt_test = clp->cl_mvops->session_trunk,
4068                         .data = &xprtdata,
4069                 };
4070                 char *servername = NULL;
4071
4072                 if (!srv_loc->len)
4073                         continue;
4074
4075                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4076                                                 &addr, sizeof(addr),
4077                                                 clp->cl_net, server->port);
4078                 if (!addrlen)
4079                         return;
4080                 xprt_args.dstaddr = (struct sockaddr *)&addr;
4081                 xprt_args.addrlen = addrlen;
4082                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4083                 if (!servername)
4084                         return;
4085                 memcpy(servername, srv_loc->data, srv_loc->len);
4086                 servername[srv_loc->len] = '\0';
4087                 xprt_args.servername = servername;
4088
4089                 xprtdata.cred = nfs4_get_clid_cred(clp);
4090                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4091                                   rpc_clnt_setup_test_and_add_xprt,
4092                                   &rpcdata);
4093                 if (xprtdata.cred)
4094                         put_cred(xprtdata.cred);
4095                 kfree(servername);
4096         }
4097 }
4098
4099 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1,
4100                                    struct nfs4_pathname *path2)
4101 {
4102         int i;
4103
4104         if (path1->ncomponents != path2->ncomponents)
4105                 return false;
4106         for (i = 0; i < path1->ncomponents; i++) {
4107                 if (path1->components[i].len != path2->components[i].len)
4108                         return false;
4109                 if (memcmp(path1->components[i].data, path2->components[i].data,
4110                                 path1->components[i].len))
4111                         return false;
4112         }
4113         return true;
4114 }
4115
4116 static int _nfs4_discover_trunking(struct nfs_server *server,
4117                                    struct nfs_fh *fhandle)
4118 {
4119         struct nfs4_fs_locations *locations = NULL;
4120         struct page *page;
4121         const struct cred *cred;
4122         struct nfs_client *clp = server->nfs_client;
4123         const struct nfs4_state_maintenance_ops *ops =
4124                 clp->cl_mvops->state_renewal_ops;
4125         int status = -ENOMEM, i;
4126
4127         cred = ops->get_state_renewal_cred(clp);
4128         if (cred == NULL) {
4129                 cred = nfs4_get_clid_cred(clp);
4130                 if (cred == NULL)
4131                         return -ENOKEY;
4132         }
4133
4134         page = alloc_page(GFP_KERNEL);
4135         if (!page)
4136                 goto out_put_cred;
4137         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4138         if (!locations)
4139                 goto out_free;
4140         locations->fattr = nfs_alloc_fattr();
4141         if (!locations->fattr)
4142                 goto out_free_2;
4143
4144         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4145                                          cred);
4146         if (status)
4147                 goto out_free_3;
4148
4149         for (i = 0; i < locations->nlocations; i++) {
4150                 if (!_is_same_nfs4_pathname(&locations->fs_path,
4151                                         &locations->locations[i].rootpath))
4152                         continue;
4153                 test_fs_location_for_trunking(&locations->locations[i], clp,
4154                                               server);
4155         }
4156 out_free_3:
4157         kfree(locations->fattr);
4158 out_free_2:
4159         kfree(locations);
4160 out_free:
4161         __free_page(page);
4162 out_put_cred:
4163         put_cred(cred);
4164         return status;
4165 }
4166
4167 static int nfs4_discover_trunking(struct nfs_server *server,
4168                                   struct nfs_fh *fhandle)
4169 {
4170         struct nfs4_exception exception = {
4171                 .interruptible = true,
4172         };
4173         struct nfs_client *clp = server->nfs_client;
4174         int err = 0;
4175
4176         if (!nfs4_has_session(clp))
4177                 goto out;
4178         do {
4179                 err = nfs4_handle_exception(server,
4180                                 _nfs4_discover_trunking(server, fhandle),
4181                                 &exception);
4182         } while (exception.retry);
4183 out:
4184         return err;
4185 }
4186
4187 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4188                 struct nfs_fsinfo *info)
4189 {
4190         u32 bitmask[3];
4191         struct nfs4_lookup_root_arg args = {
4192                 .bitmask = bitmask,
4193         };
4194         struct nfs4_lookup_res res = {
4195                 .server = server,
4196                 .fattr = info->fattr,
4197                 .fh = fhandle,
4198         };
4199         struct rpc_message msg = {
4200                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4201                 .rpc_argp = &args,
4202                 .rpc_resp = &res,
4203         };
4204
4205         bitmask[0] = nfs4_fattr_bitmap[0];
4206         bitmask[1] = nfs4_fattr_bitmap[1];
4207         /*
4208          * Process the label in the upcoming getfattr
4209          */
4210         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4211
4212         nfs_fattr_init(info->fattr);
4213         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4214 }
4215
4216 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4217                 struct nfs_fsinfo *info)
4218 {
4219         struct nfs4_exception exception = {
4220                 .interruptible = true,
4221         };
4222         int err;
4223         do {
4224                 err = _nfs4_lookup_root(server, fhandle, info);
4225                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4226                 switch (err) {
4227                 case 0:
4228                 case -NFS4ERR_WRONGSEC:
4229                         goto out;
4230                 default:
4231                         err = nfs4_handle_exception(server, err, &exception);
4232                 }
4233         } while (exception.retry);
4234 out:
4235         return err;
4236 }
4237
4238 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4239                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4240 {
4241         struct rpc_auth_create_args auth_args = {
4242                 .pseudoflavor = flavor,
4243         };
4244         struct rpc_auth *auth;
4245
4246         auth = rpcauth_create(&auth_args, server->client);
4247         if (IS_ERR(auth))
4248                 return -EACCES;
4249         return nfs4_lookup_root(server, fhandle, info);
4250 }
4251
4252 /*
4253  * Retry pseudoroot lookup with various security flavors.  We do this when:
4254  *
4255  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4256  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4257  *
4258  * Returns zero on success, or a negative NFS4ERR value, or a
4259  * negative errno value.
4260  */
4261 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4262                               struct nfs_fsinfo *info)
4263 {
4264         /* Per 3530bis 15.33.5 */
4265         static const rpc_authflavor_t flav_array[] = {
4266                 RPC_AUTH_GSS_KRB5P,
4267                 RPC_AUTH_GSS_KRB5I,
4268                 RPC_AUTH_GSS_KRB5,
4269                 RPC_AUTH_UNIX,                  /* courtesy */
4270                 RPC_AUTH_NULL,
4271         };
4272         int status = -EPERM;
4273         size_t i;
4274
4275         if (server->auth_info.flavor_len > 0) {
4276                 /* try each flavor specified by user */
4277                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4278                         status = nfs4_lookup_root_sec(server, fhandle, info,
4279                                                 server->auth_info.flavors[i]);
4280                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4281                                 continue;
4282                         break;
4283                 }
4284         } else {
4285                 /* no flavors specified by user, try default list */
4286                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4287                         status = nfs4_lookup_root_sec(server, fhandle, info,
4288                                                       flav_array[i]);
4289                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4290                                 continue;
4291                         break;
4292                 }
4293         }
4294
4295         /*
4296          * -EACCES could mean that the user doesn't have correct permissions
4297          * to access the mount.  It could also mean that we tried to mount
4298          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4299          * existing mount programs don't handle -EACCES very well so it should
4300          * be mapped to -EPERM instead.
4301          */
4302         if (status == -EACCES)
4303                 status = -EPERM;
4304         return status;
4305 }
4306
4307 /**
4308  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4309  * @server: initialized nfs_server handle
4310  * @fhandle: we fill in the pseudo-fs root file handle
4311  * @info: we fill in an FSINFO struct
4312  * @auth_probe: probe the auth flavours
4313  *
4314  * Returns zero on success, or a negative errno.
4315  */
4316 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4317                          struct nfs_fsinfo *info,
4318                          bool auth_probe)
4319 {
4320         int status = 0;
4321
4322         if (!auth_probe)
4323                 status = nfs4_lookup_root(server, fhandle, info);
4324
4325         if (auth_probe || status == NFS4ERR_WRONGSEC)
4326                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4327                                 fhandle, info);
4328
4329         if (status == 0)
4330                 status = nfs4_server_capabilities(server, fhandle);
4331         if (status == 0)
4332                 status = nfs4_do_fsinfo(server, fhandle, info);
4333
4334         return nfs4_map_errors(status);
4335 }
4336
4337 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4338                               struct nfs_fsinfo *info)
4339 {
4340         int error;
4341         struct nfs_fattr *fattr = info->fattr;
4342
4343         error = nfs4_server_capabilities(server, mntfh);
4344         if (error < 0) {
4345                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4346                 return error;
4347         }
4348
4349         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4350         if (error < 0) {
4351                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4352                 goto out;
4353         }
4354
4355         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4356             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4357                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4358
4359 out:
4360         return error;
4361 }
4362
4363 /*
4364  * Get locations and (maybe) other attributes of a referral.
4365  * Note that we'll actually follow the referral later when
4366  * we detect fsid mismatch in inode revalidation
4367  */
4368 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4369                              const struct qstr *name, struct nfs_fattr *fattr,
4370                              struct nfs_fh *fhandle)
4371 {
4372         int status = -ENOMEM;
4373         struct page *page = NULL;
4374         struct nfs4_fs_locations *locations = NULL;
4375
4376         page = alloc_page(GFP_KERNEL);
4377         if (page == NULL)
4378                 goto out;
4379         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4380         if (locations == NULL)
4381                 goto out;
4382
4383         locations->fattr = fattr;
4384
4385         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4386         if (status != 0)
4387                 goto out;
4388
4389         /*
4390          * If the fsid didn't change, this is a migration event, not a
4391          * referral.  Cause us to drop into the exception handler, which
4392          * will kick off migration recovery.
4393          */
4394         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4395                 dprintk("%s: server did not return a different fsid for"
4396                         " a referral at %s\n", __func__, name->name);
4397                 status = -NFS4ERR_MOVED;
4398                 goto out;
4399         }
4400         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4401         nfs_fixup_referral_attributes(fattr);
4402         memset(fhandle, 0, sizeof(struct nfs_fh));
4403 out:
4404         if (page)
4405                 __free_page(page);
4406         kfree(locations);
4407         return status;
4408 }
4409
4410 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4411                                 struct nfs_fattr *fattr, struct inode *inode)
4412 {
4413         __u32 bitmask[NFS4_BITMASK_SZ];
4414         struct nfs4_getattr_arg args = {
4415                 .fh = fhandle,
4416                 .bitmask = bitmask,
4417         };
4418         struct nfs4_getattr_res res = {
4419                 .fattr = fattr,
4420                 .server = server,
4421         };
4422         struct rpc_message msg = {
4423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4424                 .rpc_argp = &args,
4425                 .rpc_resp = &res,
4426         };
4427         unsigned short task_flags = 0;
4428
4429         if (nfs4_has_session(server->nfs_client))
4430                 task_flags = RPC_TASK_MOVEABLE;
4431
4432         /* Is this is an attribute revalidation, subject to softreval? */
4433         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4434                 task_flags |= RPC_TASK_TIMEOUT;
4435
4436         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4437         nfs_fattr_init(fattr);
4438         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4439         return nfs4_do_call_sync(server->client, server, &msg,
4440                         &args.seq_args, &res.seq_res, task_flags);
4441 }
4442
4443 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4444                                 struct nfs_fattr *fattr, struct inode *inode)
4445 {
4446         struct nfs4_exception exception = {
4447                 .interruptible = true,
4448         };
4449         int err;
4450         do {
4451                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4452                 trace_nfs4_getattr(server, fhandle, fattr, err);
4453                 err = nfs4_handle_exception(server, err,
4454                                 &exception);
4455         } while (exception.retry);
4456         return err;
4457 }
4458
4459 /*
4460  * The file is not closed if it is opened due to the a request to change
4461  * the size of the file. The open call will not be needed once the
4462  * VFS layer lookup-intents are implemented.
4463  *
4464  * Close is called when the inode is destroyed.
4465  * If we haven't opened the file for O_WRONLY, we
4466  * need to in the size_change case to obtain a stateid.
4467  *
4468  * Got race?
4469  * Because OPEN is always done by name in nfsv4, it is
4470  * possible that we opened a different file by the same
4471  * name.  We can recognize this race condition, but we
4472  * can't do anything about it besides returning an error.
4473  *
4474  * This will be fixed with VFS changes (lookup-intent).
4475  */
4476 static int
4477 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4478                   struct iattr *sattr)
4479 {
4480         struct inode *inode = d_inode(dentry);
4481         const struct cred *cred = NULL;
4482         struct nfs_open_context *ctx = NULL;
4483         int status;
4484
4485         if (pnfs_ld_layoutret_on_setattr(inode) &&
4486             sattr->ia_valid & ATTR_SIZE &&
4487             sattr->ia_size < i_size_read(inode))
4488                 pnfs_commit_and_return_layout(inode);
4489
4490         nfs_fattr_init(fattr);
4491
4492         /* Deal with open(O_TRUNC) */
4493         if (sattr->ia_valid & ATTR_OPEN)
4494                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4495
4496         /* Optimization: if the end result is no change, don't RPC */
4497         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4498                 return 0;
4499
4500         /* Search for an existing open(O_WRITE) file */
4501         if (sattr->ia_valid & ATTR_FILE) {
4502
4503                 ctx = nfs_file_open_context(sattr->ia_file);
4504                 if (ctx)
4505                         cred = ctx->cred;
4506         }
4507
4508         /* Return any delegations if we're going to change ACLs */
4509         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4510                 nfs4_inode_make_writeable(inode);
4511
4512         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4513         if (status == 0) {
4514                 nfs_setattr_update_inode(inode, sattr, fattr);
4515                 nfs_setsecurity(inode, fattr);
4516         }
4517         return status;
4518 }
4519
4520 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4521                 struct dentry *dentry, struct nfs_fh *fhandle,
4522                 struct nfs_fattr *fattr)
4523 {
4524         struct nfs_server *server = NFS_SERVER(dir);
4525         int                    status;
4526         struct nfs4_lookup_arg args = {
4527                 .bitmask = server->attr_bitmask,
4528                 .dir_fh = NFS_FH(dir),
4529                 .name = &dentry->d_name,
4530         };
4531         struct nfs4_lookup_res res = {
4532                 .server = server,
4533                 .fattr = fattr,
4534                 .fh = fhandle,
4535         };
4536         struct rpc_message msg = {
4537                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4538                 .rpc_argp = &args,
4539                 .rpc_resp = &res,
4540         };
4541         unsigned short task_flags = 0;
4542
4543         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4544                 task_flags = RPC_TASK_MOVEABLE;
4545
4546         /* Is this is an attribute revalidation, subject to softreval? */
4547         if (nfs_lookup_is_soft_revalidate(dentry))
4548                 task_flags |= RPC_TASK_TIMEOUT;
4549
4550         args.bitmask = nfs4_bitmask(server, fattr->label);
4551
4552         nfs_fattr_init(fattr);
4553
4554         dprintk("NFS call  lookup %pd2\n", dentry);
4555         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4556         status = nfs4_do_call_sync(clnt, server, &msg,
4557                         &args.seq_args, &res.seq_res, task_flags);
4558         dprintk("NFS reply lookup: %d\n", status);
4559         return status;
4560 }
4561
4562 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4563 {
4564         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4565                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4566         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4567         fattr->nlink = 2;
4568 }
4569
4570 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4571                                    struct dentry *dentry, struct nfs_fh *fhandle,
4572                                    struct nfs_fattr *fattr)
4573 {
4574         struct nfs4_exception exception = {
4575                 .interruptible = true,
4576         };
4577         struct rpc_clnt *client = *clnt;
4578         const struct qstr *name = &dentry->d_name;
4579         int err;
4580         do {
4581                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4582                 trace_nfs4_lookup(dir, name, err);
4583                 switch (err) {
4584                 case -NFS4ERR_BADNAME:
4585                         err = -ENOENT;
4586                         goto out;
4587                 case -NFS4ERR_MOVED:
4588                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4589                         if (err == -NFS4ERR_MOVED)
4590                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4591                         goto out;
4592                 case -NFS4ERR_WRONGSEC:
4593                         err = -EPERM;
4594                         if (client != *clnt)
4595                                 goto out;
4596                         client = nfs4_negotiate_security(client, dir, name);
4597                         if (IS_ERR(client))
4598                                 return PTR_ERR(client);
4599
4600                         exception.retry = 1;
4601                         break;
4602                 default:
4603                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4604                 }
4605         } while (exception.retry);
4606
4607 out:
4608         if (err == 0)
4609                 *clnt = client;
4610         else if (client != *clnt)
4611                 rpc_shutdown_client(client);
4612
4613         return err;
4614 }
4615
4616 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4617                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4618 {
4619         int status;
4620         struct rpc_clnt *client = NFS_CLIENT(dir);
4621
4622         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4623         if (client != NFS_CLIENT(dir)) {
4624                 rpc_shutdown_client(client);
4625                 nfs_fixup_secinfo_attributes(fattr);
4626         }
4627         return status;
4628 }
4629
4630 struct rpc_clnt *
4631 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4632                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4633 {
4634         struct rpc_clnt *client = NFS_CLIENT(dir);
4635         int status;
4636
4637         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4638         if (status < 0)
4639                 return ERR_PTR(status);
4640         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4641 }
4642
4643 static int _nfs4_proc_lookupp(struct inode *inode,
4644                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4645 {
4646         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4647         struct nfs_server *server = NFS_SERVER(inode);
4648         int                    status;
4649         struct nfs4_lookupp_arg args = {
4650                 .bitmask = server->attr_bitmask,
4651                 .fh = NFS_FH(inode),
4652         };
4653         struct nfs4_lookupp_res res = {
4654                 .server = server,
4655                 .fattr = fattr,
4656                 .fh = fhandle,
4657         };
4658         struct rpc_message msg = {
4659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4660                 .rpc_argp = &args,
4661                 .rpc_resp = &res,
4662         };
4663         unsigned short task_flags = 0;
4664
4665         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4666                 task_flags |= RPC_TASK_TIMEOUT;
4667
4668         args.bitmask = nfs4_bitmask(server, fattr->label);
4669
4670         nfs_fattr_init(fattr);
4671
4672         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4673         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4674                                 &res.seq_res, task_flags);
4675         dprintk("NFS reply lookupp: %d\n", status);
4676         return status;
4677 }
4678
4679 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4680                              struct nfs_fattr *fattr)
4681 {
4682         struct nfs4_exception exception = {
4683                 .interruptible = true,
4684         };
4685         int err;
4686         do {
4687                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4688                 trace_nfs4_lookupp(inode, err);
4689                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4690                                 &exception);
4691         } while (exception.retry);
4692         return err;
4693 }
4694
4695 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4696                              const struct cred *cred)
4697 {
4698         struct nfs_server *server = NFS_SERVER(inode);
4699         struct nfs4_accessargs args = {
4700                 .fh = NFS_FH(inode),
4701                 .access = entry->mask,
4702         };
4703         struct nfs4_accessres res = {
4704                 .server = server,
4705         };
4706         struct rpc_message msg = {
4707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4708                 .rpc_argp = &args,
4709                 .rpc_resp = &res,
4710                 .rpc_cred = cred,
4711         };
4712         int status = 0;
4713
4714         if (!nfs4_have_delegation(inode, FMODE_READ, 0)) {
4715                 res.fattr = nfs_alloc_fattr();
4716                 if (res.fattr == NULL)
4717                         return -ENOMEM;
4718                 args.bitmask = server->cache_consistency_bitmask;
4719         }
4720         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4721         if (!status) {
4722                 nfs_access_set_mask(entry, res.access);
4723                 if (res.fattr)
4724                         nfs_refresh_inode(inode, res.fattr);
4725         }
4726         nfs_free_fattr(res.fattr);
4727         return status;
4728 }
4729
4730 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4731                             const struct cred *cred)
4732 {
4733         struct nfs4_exception exception = {
4734                 .interruptible = true,
4735         };
4736         int err;
4737         do {
4738                 err = _nfs4_proc_access(inode, entry, cred);
4739                 trace_nfs4_access(inode, err);
4740                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4741                                 &exception);
4742         } while (exception.retry);
4743         return err;
4744 }
4745
4746 /*
4747  * TODO: For the time being, we don't try to get any attributes
4748  * along with any of the zero-copy operations READ, READDIR,
4749  * READLINK, WRITE.
4750  *
4751  * In the case of the first three, we want to put the GETATTR
4752  * after the read-type operation -- this is because it is hard
4753  * to predict the length of a GETATTR response in v4, and thus
4754  * align the READ data correctly.  This means that the GETATTR
4755  * may end up partially falling into the page cache, and we should
4756  * shift it into the 'tail' of the xdr_buf before processing.
4757  * To do this efficiently, we need to know the total length
4758  * of data received, which doesn't seem to be available outside
4759  * of the RPC layer.
4760  *
4761  * In the case of WRITE, we also want to put the GETATTR after
4762  * the operation -- in this case because we want to make sure
4763  * we get the post-operation mtime and size.
4764  *
4765  * Both of these changes to the XDR layer would in fact be quite
4766  * minor, but I decided to leave them for a subsequent patch.
4767  */
4768 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4769                 unsigned int pgbase, unsigned int pglen)
4770 {
4771         struct nfs4_readlink args = {
4772                 .fh       = NFS_FH(inode),
4773                 .pgbase   = pgbase,
4774                 .pglen    = pglen,
4775                 .pages    = &page,
4776         };
4777         struct nfs4_readlink_res res;
4778         struct rpc_message msg = {
4779                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4780                 .rpc_argp = &args,
4781                 .rpc_resp = &res,
4782         };
4783
4784         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4785 }
4786
4787 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4788                 unsigned int pgbase, unsigned int pglen)
4789 {
4790         struct nfs4_exception exception = {
4791                 .interruptible = true,
4792         };
4793         int err;
4794         do {
4795                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4796                 trace_nfs4_readlink(inode, err);
4797                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4798                                 &exception);
4799         } while (exception.retry);
4800         return err;
4801 }
4802
4803 /*
4804  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4805  */
4806 static int
4807 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4808                  int flags)
4809 {
4810         struct nfs_server *server = NFS_SERVER(dir);
4811         struct nfs4_label l, *ilabel;
4812         struct nfs_open_context *ctx;
4813         struct nfs4_state *state;
4814         int status = 0;
4815
4816         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4817         if (IS_ERR(ctx))
4818                 return PTR_ERR(ctx);
4819
4820         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4821
4822         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4823                 sattr->ia_mode &= ~current_umask();
4824         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4825         if (IS_ERR(state)) {
4826                 status = PTR_ERR(state);
4827                 goto out;
4828         }
4829 out:
4830         nfs4_label_release_security(ilabel);
4831         put_nfs_open_context(ctx);
4832         return status;
4833 }
4834
4835 static int
4836 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4837 {
4838         struct nfs_server *server = NFS_SERVER(dir);
4839         struct nfs_removeargs args = {
4840                 .fh = NFS_FH(dir),
4841                 .name = *name,
4842         };
4843         struct nfs_removeres res = {
4844                 .server = server,
4845         };
4846         struct rpc_message msg = {
4847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4848                 .rpc_argp = &args,
4849                 .rpc_resp = &res,
4850         };
4851         unsigned long timestamp = jiffies;
4852         int status;
4853
4854         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4855         if (status == 0) {
4856                 spin_lock(&dir->i_lock);
4857                 /* Removing a directory decrements nlink in the parent */
4858                 if (ftype == NF4DIR && dir->i_nlink > 2)
4859                         nfs4_dec_nlink_locked(dir);
4860                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4861                                               NFS_INO_INVALID_DATA);
4862                 spin_unlock(&dir->i_lock);
4863         }
4864         return status;
4865 }
4866
4867 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4868 {
4869         struct nfs4_exception exception = {
4870                 .interruptible = true,
4871         };
4872         struct inode *inode = d_inode(dentry);
4873         int err;
4874
4875         if (inode) {
4876                 if (inode->i_nlink == 1)
4877                         nfs4_inode_return_delegation(inode);
4878                 else
4879                         nfs4_inode_make_writeable(inode);
4880         }
4881         do {
4882                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4883                 trace_nfs4_remove(dir, &dentry->d_name, err);
4884                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4885                                 &exception);
4886         } while (exception.retry);
4887         return err;
4888 }
4889
4890 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4891 {
4892         struct nfs4_exception exception = {
4893                 .interruptible = true,
4894         };
4895         int err;
4896
4897         do {
4898                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4899                 trace_nfs4_remove(dir, name, err);
4900                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4901                                 &exception);
4902         } while (exception.retry);
4903         return err;
4904 }
4905
4906 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4907                 struct dentry *dentry,
4908                 struct inode *inode)
4909 {
4910         struct nfs_removeargs *args = msg->rpc_argp;
4911         struct nfs_removeres *res = msg->rpc_resp;
4912
4913         res->server = NFS_SB(dentry->d_sb);
4914         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4915         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4916
4917         nfs_fattr_init(res->dir_attr);
4918
4919         if (inode) {
4920                 nfs4_inode_return_delegation(inode);
4921                 nfs_d_prune_case_insensitive_aliases(inode);
4922         }
4923 }
4924
4925 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4926 {
4927         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4928                         &data->args.seq_args,
4929                         &data->res.seq_res,
4930                         task);
4931 }
4932
4933 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4934 {
4935         struct nfs_unlinkdata *data = task->tk_calldata;
4936         struct nfs_removeres *res = &data->res;
4937
4938         if (!nfs4_sequence_done(task, &res->seq_res))
4939                 return 0;
4940         if (nfs4_async_handle_error(task, res->server, NULL,
4941                                     &data->timeout) == -EAGAIN)
4942                 return 0;
4943         if (task->tk_status == 0)
4944                 nfs4_update_changeattr(dir, &res->cinfo,
4945                                 res->dir_attr->time_start,
4946                                 NFS_INO_INVALID_DATA);
4947         return 1;
4948 }
4949
4950 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4951                 struct dentry *old_dentry,
4952                 struct dentry *new_dentry)
4953 {
4954         struct nfs_renameargs *arg = msg->rpc_argp;
4955         struct nfs_renameres *res = msg->rpc_resp;
4956         struct inode *old_inode = d_inode(old_dentry);
4957         struct inode *new_inode = d_inode(new_dentry);
4958
4959         if (old_inode)
4960                 nfs4_inode_make_writeable(old_inode);
4961         if (new_inode)
4962                 nfs4_inode_return_delegation(new_inode);
4963         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4964         res->server = NFS_SB(old_dentry->d_sb);
4965         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4966 }
4967
4968 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4969 {
4970         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4971                         &data->args.seq_args,
4972                         &data->res.seq_res,
4973                         task);
4974 }
4975
4976 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4977                                  struct inode *new_dir)
4978 {
4979         struct nfs_renamedata *data = task->tk_calldata;
4980         struct nfs_renameres *res = &data->res;
4981
4982         if (!nfs4_sequence_done(task, &res->seq_res))
4983                 return 0;
4984         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4985                 return 0;
4986
4987         if (task->tk_status == 0) {
4988                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4989                 if (new_dir != old_dir) {
4990                         /* Note: If we moved a directory, nlink will change */
4991                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4992                                         res->old_fattr->time_start,
4993                                         NFS_INO_INVALID_NLINK |
4994                                             NFS_INO_INVALID_DATA);
4995                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4996                                         res->new_fattr->time_start,
4997                                         NFS_INO_INVALID_NLINK |
4998                                             NFS_INO_INVALID_DATA);
4999                 } else
5000                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
5001                                         res->old_fattr->time_start,
5002                                         NFS_INO_INVALID_DATA);
5003         }
5004         return 1;
5005 }
5006
5007 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5008 {
5009         struct nfs_server *server = NFS_SERVER(inode);
5010         __u32 bitmask[NFS4_BITMASK_SZ];
5011         struct nfs4_link_arg arg = {
5012                 .fh     = NFS_FH(inode),
5013                 .dir_fh = NFS_FH(dir),
5014                 .name   = name,
5015                 .bitmask = bitmask,
5016         };
5017         struct nfs4_link_res res = {
5018                 .server = server,
5019         };
5020         struct rpc_message msg = {
5021                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
5022                 .rpc_argp = &arg,
5023                 .rpc_resp = &res,
5024         };
5025         int status = -ENOMEM;
5026
5027         res.fattr = nfs_alloc_fattr_with_label(server);
5028         if (res.fattr == NULL)
5029                 goto out;
5030
5031         nfs4_inode_make_writeable(inode);
5032         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label),
5033                                 inode,
5034                                 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME);
5035         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5036         if (!status) {
5037                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
5038                                        NFS_INO_INVALID_DATA);
5039                 nfs4_inc_nlink(inode);
5040                 status = nfs_post_op_update_inode(inode, res.fattr);
5041                 if (!status)
5042                         nfs_setsecurity(inode, res.fattr);
5043         }
5044
5045 out:
5046         nfs_free_fattr(res.fattr);
5047         return status;
5048 }
5049
5050 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
5051 {
5052         struct nfs4_exception exception = {
5053                 .interruptible = true,
5054         };
5055         int err;
5056         do {
5057                 err = nfs4_handle_exception(NFS_SERVER(inode),
5058                                 _nfs4_proc_link(inode, dir, name),
5059                                 &exception);
5060         } while (exception.retry);
5061         return err;
5062 }
5063
5064 struct nfs4_createdata {
5065         struct rpc_message msg;
5066         struct nfs4_create_arg arg;
5067         struct nfs4_create_res res;
5068         struct nfs_fh fh;
5069         struct nfs_fattr fattr;
5070 };
5071
5072 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
5073                 const struct qstr *name, struct iattr *sattr, u32 ftype)
5074 {
5075         struct nfs4_createdata *data;
5076
5077         data = kzalloc(sizeof(*data), GFP_KERNEL);
5078         if (data != NULL) {
5079                 struct nfs_server *server = NFS_SERVER(dir);
5080
5081                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
5082                 if (IS_ERR(data->fattr.label))
5083                         goto out_free;
5084
5085                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
5086                 data->msg.rpc_argp = &data->arg;
5087                 data->msg.rpc_resp = &data->res;
5088                 data->arg.dir_fh = NFS_FH(dir);
5089                 data->arg.server = server;
5090                 data->arg.name = name;
5091                 data->arg.attrs = sattr;
5092                 data->arg.ftype = ftype;
5093                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
5094                 data->arg.umask = current_umask();
5095                 data->res.server = server;
5096                 data->res.fh = &data->fh;
5097                 data->res.fattr = &data->fattr;
5098                 nfs_fattr_init(data->res.fattr);
5099         }
5100         return data;
5101 out_free:
5102         kfree(data);
5103         return NULL;
5104 }
5105
5106 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5107 {
5108         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5109                                     &data->arg.seq_args, &data->res.seq_res, 1);
5110         if (status == 0) {
5111                 spin_lock(&dir->i_lock);
5112                 /* Creating a directory bumps nlink in the parent */
5113                 if (data->arg.ftype == NF4DIR)
5114                         nfs4_inc_nlink_locked(dir);
5115                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5116                                               data->res.fattr->time_start,
5117                                               NFS_INO_INVALID_DATA);
5118                 spin_unlock(&dir->i_lock);
5119                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5120         }
5121         return status;
5122 }
5123
5124 static void nfs4_free_createdata(struct nfs4_createdata *data)
5125 {
5126         nfs4_label_free(data->fattr.label);
5127         kfree(data);
5128 }
5129
5130 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5131                 struct folio *folio, unsigned int len, struct iattr *sattr,
5132                 struct nfs4_label *label)
5133 {
5134         struct page *page = &folio->page;
5135         struct nfs4_createdata *data;
5136         int status = -ENAMETOOLONG;
5137
5138         if (len > NFS4_MAXPATHLEN)
5139                 goto out;
5140
5141         status = -ENOMEM;
5142         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5143         if (data == NULL)
5144                 goto out;
5145
5146         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5147         data->arg.u.symlink.pages = &page;
5148         data->arg.u.symlink.len = len;
5149         data->arg.label = label;
5150
5151         status = nfs4_do_create(dir, dentry, data);
5152
5153         nfs4_free_createdata(data);
5154 out:
5155         return status;
5156 }
5157
5158 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5159                 struct folio *folio, unsigned int len, struct iattr *sattr)
5160 {
5161         struct nfs4_exception exception = {
5162                 .interruptible = true,
5163         };
5164         struct nfs4_label l, *label;
5165         int err;
5166
5167         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5168
5169         do {
5170                 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
5171                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5172                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5173                                 &exception);
5174         } while (exception.retry);
5175
5176         nfs4_label_release_security(label);
5177         return err;
5178 }
5179
5180 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5181                 struct iattr *sattr, struct nfs4_label *label)
5182 {
5183         struct nfs4_createdata *data;
5184         int status = -ENOMEM;
5185
5186         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5187         if (data == NULL)
5188                 goto out;
5189
5190         data->arg.label = label;
5191         status = nfs4_do_create(dir, dentry, data);
5192
5193         nfs4_free_createdata(data);
5194 out:
5195         return status;
5196 }
5197
5198 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5199                 struct iattr *sattr)
5200 {
5201         struct nfs_server *server = NFS_SERVER(dir);
5202         struct nfs4_exception exception = {
5203                 .interruptible = true,
5204         };
5205         struct nfs4_label l, *label;
5206         int err;
5207
5208         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5209
5210         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5211                 sattr->ia_mode &= ~current_umask();
5212         do {
5213                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5214                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5215                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5216                                 &exception);
5217         } while (exception.retry);
5218         nfs4_label_release_security(label);
5219
5220         return err;
5221 }
5222
5223 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5224                               struct nfs_readdir_res *nr_res)
5225 {
5226         struct inode            *dir = d_inode(nr_arg->dentry);
5227         struct nfs_server       *server = NFS_SERVER(dir);
5228         struct nfs4_readdir_arg args = {
5229                 .fh = NFS_FH(dir),
5230                 .pages = nr_arg->pages,
5231                 .pgbase = 0,
5232                 .count = nr_arg->page_len,
5233                 .plus = nr_arg->plus,
5234         };
5235         struct nfs4_readdir_res res;
5236         struct rpc_message msg = {
5237                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5238                 .rpc_argp = &args,
5239                 .rpc_resp = &res,
5240                 .rpc_cred = nr_arg->cred,
5241         };
5242         int                     status;
5243
5244         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5245                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5246         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5247                 args.bitmask = server->attr_bitmask_nl;
5248         else
5249                 args.bitmask = server->attr_bitmask;
5250
5251         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5252         res.pgbase = args.pgbase;
5253         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5254                         &res.seq_res, 0);
5255         if (status >= 0) {
5256                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5257                 status += args.pgbase;
5258         }
5259
5260         nfs_invalidate_atime(dir);
5261
5262         dprintk("%s: returns %d\n", __func__, status);
5263         return status;
5264 }
5265
5266 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5267                              struct nfs_readdir_res *res)
5268 {
5269         struct nfs4_exception exception = {
5270                 .interruptible = true,
5271         };
5272         int err;
5273         do {
5274                 err = _nfs4_proc_readdir(arg, res);
5275                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5276                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5277                                             err, &exception);
5278         } while (exception.retry);
5279         return err;
5280 }
5281
5282 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5283                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5284 {
5285         struct nfs4_createdata *data;
5286         int mode = sattr->ia_mode;
5287         int status = -ENOMEM;
5288
5289         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5290         if (data == NULL)
5291                 goto out;
5292
5293         if (S_ISFIFO(mode))
5294                 data->arg.ftype = NF4FIFO;
5295         else if (S_ISBLK(mode)) {
5296                 data->arg.ftype = NF4BLK;
5297                 data->arg.u.device.specdata1 = MAJOR(rdev);
5298                 data->arg.u.device.specdata2 = MINOR(rdev);
5299         }
5300         else if (S_ISCHR(mode)) {
5301                 data->arg.ftype = NF4CHR;
5302                 data->arg.u.device.specdata1 = MAJOR(rdev);
5303                 data->arg.u.device.specdata2 = MINOR(rdev);
5304         } else if (!S_ISSOCK(mode)) {
5305                 status = -EINVAL;
5306                 goto out_free;
5307         }
5308
5309         data->arg.label = label;
5310         status = nfs4_do_create(dir, dentry, data);
5311 out_free:
5312         nfs4_free_createdata(data);
5313 out:
5314         return status;
5315 }
5316
5317 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5318                 struct iattr *sattr, dev_t rdev)
5319 {
5320         struct nfs_server *server = NFS_SERVER(dir);
5321         struct nfs4_exception exception = {
5322                 .interruptible = true,
5323         };
5324         struct nfs4_label l, *label;
5325         int err;
5326
5327         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5328
5329         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5330                 sattr->ia_mode &= ~current_umask();
5331         do {
5332                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5333                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5334                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5335                                 &exception);
5336         } while (exception.retry);
5337
5338         nfs4_label_release_security(label);
5339
5340         return err;
5341 }
5342
5343 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5344                  struct nfs_fsstat *fsstat)
5345 {
5346         struct nfs4_statfs_arg args = {
5347                 .fh = fhandle,
5348                 .bitmask = server->attr_bitmask,
5349         };
5350         struct nfs4_statfs_res res = {
5351                 .fsstat = fsstat,
5352         };
5353         struct rpc_message msg = {
5354                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5355                 .rpc_argp = &args,
5356                 .rpc_resp = &res,
5357         };
5358
5359         nfs_fattr_init(fsstat->fattr);
5360         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5361 }
5362
5363 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5364 {
5365         struct nfs4_exception exception = {
5366                 .interruptible = true,
5367         };
5368         int err;
5369         do {
5370                 err = nfs4_handle_exception(server,
5371                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5372                                 &exception);
5373         } while (exception.retry);
5374         return err;
5375 }
5376
5377 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5378                 struct nfs_fsinfo *fsinfo)
5379 {
5380         struct nfs4_fsinfo_arg args = {
5381                 .fh = fhandle,
5382                 .bitmask = server->attr_bitmask,
5383         };
5384         struct nfs4_fsinfo_res res = {
5385                 .fsinfo = fsinfo,
5386         };
5387         struct rpc_message msg = {
5388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5389                 .rpc_argp = &args,
5390                 .rpc_resp = &res,
5391         };
5392
5393         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5394 }
5395
5396 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5397 {
5398         struct nfs4_exception exception = {
5399                 .interruptible = true,
5400         };
5401         int err;
5402
5403         do {
5404                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5405                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5406                 if (err == 0) {
5407                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5408                         break;
5409                 }
5410                 err = nfs4_handle_exception(server, err, &exception);
5411         } while (exception.retry);
5412         return err;
5413 }
5414
5415 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5416 {
5417         int error;
5418
5419         nfs_fattr_init(fsinfo->fattr);
5420         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5421         if (error == 0) {
5422                 /* block layout checks this! */
5423                 server->pnfs_blksize = fsinfo->blksize;
5424                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5425         }
5426
5427         return error;
5428 }
5429
5430 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5431                 struct nfs_pathconf *pathconf)
5432 {
5433         struct nfs4_pathconf_arg args = {
5434                 .fh = fhandle,
5435                 .bitmask = server->attr_bitmask,
5436         };
5437         struct nfs4_pathconf_res res = {
5438                 .pathconf = pathconf,
5439         };
5440         struct rpc_message msg = {
5441                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5442                 .rpc_argp = &args,
5443                 .rpc_resp = &res,
5444         };
5445
5446         /* None of the pathconf attributes are mandatory to implement */
5447         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5448                 memset(pathconf, 0, sizeof(*pathconf));
5449                 return 0;
5450         }
5451
5452         nfs_fattr_init(pathconf->fattr);
5453         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5454 }
5455
5456 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5457                 struct nfs_pathconf *pathconf)
5458 {
5459         struct nfs4_exception exception = {
5460                 .interruptible = true,
5461         };
5462         int err;
5463
5464         do {
5465                 err = nfs4_handle_exception(server,
5466                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5467                                 &exception);
5468         } while (exception.retry);
5469         return err;
5470 }
5471
5472 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5473                 const struct nfs_open_context *ctx,
5474                 const struct nfs_lock_context *l_ctx,
5475                 fmode_t fmode)
5476 {
5477         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5478 }
5479 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5480
5481 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5482                 const struct nfs_open_context *ctx,
5483                 const struct nfs_lock_context *l_ctx,
5484                 fmode_t fmode)
5485 {
5486         nfs4_stateid _current_stateid;
5487
5488         /* If the current stateid represents a lost lock, then exit */
5489         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5490                 return true;
5491         return nfs4_stateid_match(stateid, &_current_stateid);
5492 }
5493
5494 static bool nfs4_error_stateid_expired(int err)
5495 {
5496         switch (err) {
5497         case -NFS4ERR_DELEG_REVOKED:
5498         case -NFS4ERR_ADMIN_REVOKED:
5499         case -NFS4ERR_BAD_STATEID:
5500         case -NFS4ERR_STALE_STATEID:
5501         case -NFS4ERR_OLD_STATEID:
5502         case -NFS4ERR_OPENMODE:
5503         case -NFS4ERR_EXPIRED:
5504                 return true;
5505         }
5506         return false;
5507 }
5508
5509 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5510 {
5511         struct nfs_server *server = NFS_SERVER(hdr->inode);
5512
5513         trace_nfs4_read(hdr, task->tk_status);
5514         if (task->tk_status < 0) {
5515                 struct nfs4_exception exception = {
5516                         .inode = hdr->inode,
5517                         .state = hdr->args.context->state,
5518                         .stateid = &hdr->args.stateid,
5519                 };
5520                 task->tk_status = nfs4_async_handle_exception(task,
5521                                 server, task->tk_status, &exception);
5522                 if (exception.retry) {
5523                         rpc_restart_call_prepare(task);
5524                         return -EAGAIN;
5525                 }
5526         }
5527
5528         if (task->tk_status > 0)
5529                 renew_lease(server, hdr->timestamp);
5530         return 0;
5531 }
5532
5533 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5534                 struct nfs_pgio_args *args)
5535 {
5536
5537         if (!nfs4_error_stateid_expired(task->tk_status) ||
5538                 nfs4_stateid_is_current(&args->stateid,
5539                                 args->context,
5540                                 args->lock_context,
5541                                 FMODE_READ))
5542                 return false;
5543         rpc_restart_call_prepare(task);
5544         return true;
5545 }
5546
5547 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5548                                          struct nfs_pgio_header *hdr)
5549 {
5550         struct nfs_server *server = NFS_SERVER(hdr->inode);
5551         struct rpc_message *msg = &task->tk_msg;
5552
5553         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5554             task->tk_status == -ENOTSUPP) {
5555                 server->caps &= ~NFS_CAP_READ_PLUS;
5556                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5557                 rpc_restart_call_prepare(task);
5558                 return true;
5559         }
5560         return false;
5561 }
5562
5563 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5564 {
5565         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5566                 return -EAGAIN;
5567         if (nfs4_read_stateid_changed(task, &hdr->args))
5568                 return -EAGAIN;
5569         if (nfs4_read_plus_not_supported(task, hdr))
5570                 return -EAGAIN;
5571         if (task->tk_status > 0)
5572                 nfs_invalidate_atime(hdr->inode);
5573         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5574                                     nfs4_read_done_cb(task, hdr);
5575 }
5576
5577 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5578 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5579                                     struct rpc_message *msg)
5580 {
5581         /* Note: We don't use READ_PLUS with pNFS yet */
5582         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5583                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5584                 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5585         }
5586         return false;
5587 }
5588 #else
5589 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5590                                     struct rpc_message *msg)
5591 {
5592         return false;
5593 }
5594 #endif /* CONFIG_NFS_V4_2 */
5595
5596 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5597                                  struct rpc_message *msg)
5598 {
5599         hdr->timestamp   = jiffies;
5600         if (!hdr->pgio_done_cb)
5601                 hdr->pgio_done_cb = nfs4_read_done_cb;
5602         if (!nfs42_read_plus_support(hdr, msg))
5603                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5604         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5605 }
5606
5607 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5608                                       struct nfs_pgio_header *hdr)
5609 {
5610         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5611                         &hdr->args.seq_args,
5612                         &hdr->res.seq_res,
5613                         task))
5614                 return 0;
5615         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5616                                 hdr->args.lock_context,
5617                                 hdr->rw_mode) == -EIO)
5618                 return -EIO;
5619         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5620                 return -EIO;
5621         return 0;
5622 }
5623
5624 static int nfs4_write_done_cb(struct rpc_task *task,
5625                               struct nfs_pgio_header *hdr)
5626 {
5627         struct inode *inode = hdr->inode;
5628
5629         trace_nfs4_write(hdr, task->tk_status);
5630         if (task->tk_status < 0) {
5631                 struct nfs4_exception exception = {
5632                         .inode = hdr->inode,
5633                         .state = hdr->args.context->state,
5634                         .stateid = &hdr->args.stateid,
5635                 };
5636                 task->tk_status = nfs4_async_handle_exception(task,
5637                                 NFS_SERVER(inode), task->tk_status,
5638                                 &exception);
5639                 if (exception.retry) {
5640                         rpc_restart_call_prepare(task);
5641                         return -EAGAIN;
5642                 }
5643         }
5644         if (task->tk_status >= 0) {
5645                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5646                 nfs_writeback_update_inode(hdr);
5647         }
5648         return 0;
5649 }
5650
5651 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5652                 struct nfs_pgio_args *args)
5653 {
5654
5655         if (!nfs4_error_stateid_expired(task->tk_status) ||
5656                 nfs4_stateid_is_current(&args->stateid,
5657                                 args->context,
5658                                 args->lock_context,
5659                                 FMODE_WRITE))
5660                 return false;
5661         rpc_restart_call_prepare(task);
5662         return true;
5663 }
5664
5665 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5666 {
5667         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5668                 return -EAGAIN;
5669         if (nfs4_write_stateid_changed(task, &hdr->args))
5670                 return -EAGAIN;
5671         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5672                 nfs4_write_done_cb(task, hdr);
5673 }
5674
5675 static
5676 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5677 {
5678         /* Don't request attributes for pNFS or O_DIRECT writes */
5679         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5680                 return false;
5681         /* Otherwise, request attributes if and only if we don't hold
5682          * a delegation
5683          */
5684         return nfs4_have_delegation(hdr->inode, FMODE_READ, 0) == 0;
5685 }
5686
5687 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5688                       struct inode *inode, unsigned long cache_validity)
5689 {
5690         struct nfs_server *server = NFS_SERVER(inode);
5691         unsigned int i;
5692
5693         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5694         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5695
5696         if (cache_validity & NFS_INO_INVALID_CHANGE)
5697                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5698         if (cache_validity & NFS_INO_INVALID_ATIME)
5699                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5700         if (cache_validity & NFS_INO_INVALID_MODE)
5701                 bitmask[1] |= FATTR4_WORD1_MODE;
5702         if (cache_validity & NFS_INO_INVALID_OTHER)
5703                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5704         if (cache_validity & NFS_INO_INVALID_NLINK)
5705                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5706         if (cache_validity & NFS_INO_INVALID_CTIME)
5707                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5708         if (cache_validity & NFS_INO_INVALID_MTIME)
5709                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5710         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5711                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5712
5713         if (cache_validity & NFS_INO_INVALID_SIZE)
5714                 bitmask[0] |= FATTR4_WORD0_SIZE;
5715
5716         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5717                 bitmask[i] &= server->attr_bitmask[i];
5718 }
5719
5720 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5721                                   struct rpc_message *msg,
5722                                   struct rpc_clnt **clnt)
5723 {
5724         struct nfs_server *server = NFS_SERVER(hdr->inode);
5725
5726         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5727                 hdr->args.bitmask = NULL;
5728                 hdr->res.fattr = NULL;
5729         } else {
5730                 nfs4_bitmask_set(hdr->args.bitmask_store,
5731                                  server->cache_consistency_bitmask,
5732                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5733                 hdr->args.bitmask = hdr->args.bitmask_store;
5734         }
5735
5736         if (!hdr->pgio_done_cb)
5737                 hdr->pgio_done_cb = nfs4_write_done_cb;
5738         hdr->res.server = server;
5739         hdr->timestamp   = jiffies;
5740
5741         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5742         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5743         nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5744 }
5745
5746 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5747 {
5748         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5749                         &data->args.seq_args,
5750                         &data->res.seq_res,
5751                         task);
5752 }
5753
5754 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5755 {
5756         struct inode *inode = data->inode;
5757
5758         trace_nfs4_commit(data, task->tk_status);
5759         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5760                                     NULL, NULL) == -EAGAIN) {
5761                 rpc_restart_call_prepare(task);
5762                 return -EAGAIN;
5763         }
5764         return 0;
5765 }
5766
5767 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5768 {
5769         if (!nfs4_sequence_done(task, &data->res.seq_res))
5770                 return -EAGAIN;
5771         return data->commit_done_cb(task, data);
5772 }
5773
5774 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5775                                    struct rpc_clnt **clnt)
5776 {
5777         struct nfs_server *server = NFS_SERVER(data->inode);
5778
5779         if (data->commit_done_cb == NULL)
5780                 data->commit_done_cb = nfs4_commit_done_cb;
5781         data->res.server = server;
5782         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5783         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5784         nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5785                         NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5786 }
5787
5788 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5789                                 struct nfs_commitres *res)
5790 {
5791         struct inode *dst_inode = file_inode(dst);
5792         struct nfs_server *server = NFS_SERVER(dst_inode);
5793         struct rpc_message msg = {
5794                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5795                 .rpc_argp = args,
5796                 .rpc_resp = res,
5797         };
5798
5799         args->fh = NFS_FH(dst_inode);
5800         return nfs4_call_sync(server->client, server, &msg,
5801                         &args->seq_args, &res->seq_res, 1);
5802 }
5803
5804 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5805 {
5806         struct nfs_commitargs args = {
5807                 .offset = offset,
5808                 .count = count,
5809         };
5810         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5811         struct nfs4_exception exception = { };
5812         int status;
5813
5814         do {
5815                 status = _nfs4_proc_commit(dst, &args, res);
5816                 status = nfs4_handle_exception(dst_server, status, &exception);
5817         } while (exception.retry);
5818
5819         return status;
5820 }
5821
5822 struct nfs4_renewdata {
5823         struct nfs_client       *client;
5824         unsigned long           timestamp;
5825 };
5826
5827 /*
5828  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5829  * standalone procedure for queueing an asynchronous RENEW.
5830  */
5831 static void nfs4_renew_release(void *calldata)
5832 {
5833         struct nfs4_renewdata *data = calldata;
5834         struct nfs_client *clp = data->client;
5835
5836         if (refcount_read(&clp->cl_count) > 1)
5837                 nfs4_schedule_state_renewal(clp);
5838         nfs_put_client(clp);
5839         kfree(data);
5840 }
5841
5842 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5843 {
5844         struct nfs4_renewdata *data = calldata;
5845         struct nfs_client *clp = data->client;
5846         unsigned long timestamp = data->timestamp;
5847
5848         trace_nfs4_renew_async(clp, task->tk_status);
5849         switch (task->tk_status) {
5850         case 0:
5851                 break;
5852         case -NFS4ERR_LEASE_MOVED:
5853                 nfs4_schedule_lease_moved_recovery(clp);
5854                 break;
5855         default:
5856                 /* Unless we're shutting down, schedule state recovery! */
5857                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5858                         return;
5859                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5860                         nfs4_schedule_lease_recovery(clp);
5861                         return;
5862                 }
5863                 nfs4_schedule_path_down_recovery(clp);
5864         }
5865         do_renew_lease(clp, timestamp);
5866 }
5867
5868 static const struct rpc_call_ops nfs4_renew_ops = {
5869         .rpc_call_done = nfs4_renew_done,
5870         .rpc_release = nfs4_renew_release,
5871 };
5872
5873 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5874 {
5875         struct rpc_message msg = {
5876                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5877                 .rpc_argp       = clp,
5878                 .rpc_cred       = cred,
5879         };
5880         struct nfs4_renewdata *data;
5881
5882         if (renew_flags == 0)
5883                 return 0;
5884         if (!refcount_inc_not_zero(&clp->cl_count))
5885                 return -EIO;
5886         data = kmalloc(sizeof(*data), GFP_NOFS);
5887         if (data == NULL) {
5888                 nfs_put_client(clp);
5889                 return -ENOMEM;
5890         }
5891         data->client = clp;
5892         data->timestamp = jiffies;
5893         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5894                         &nfs4_renew_ops, data);
5895 }
5896
5897 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5898 {
5899         struct rpc_message msg = {
5900                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5901                 .rpc_argp       = clp,
5902                 .rpc_cred       = cred,
5903         };
5904         unsigned long now = jiffies;
5905         int status;
5906
5907         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5908         if (status < 0)
5909                 return status;
5910         do_renew_lease(clp, now);
5911         return 0;
5912 }
5913
5914 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5915                                       enum nfs4_acl_type type)
5916 {
5917         switch (type) {
5918         default:
5919                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5920         case NFS4ACL_DACL:
5921                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5922         case NFS4ACL_SACL:
5923                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5924         }
5925 }
5926
5927 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5928  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5929  * the stack.
5930  */
5931 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5932
5933 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5934                 struct page **pages)
5935 {
5936         struct page *newpage, **spages;
5937         int rc = 0;
5938         size_t len;
5939         spages = pages;
5940
5941         do {
5942                 len = min_t(size_t, PAGE_SIZE, buflen);
5943                 newpage = alloc_page(GFP_KERNEL);
5944
5945                 if (newpage == NULL)
5946                         goto unwind;
5947                 memcpy(page_address(newpage), buf, len);
5948                 buf += len;
5949                 buflen -= len;
5950                 *pages++ = newpage;
5951                 rc++;
5952         } while (buflen != 0);
5953
5954         return rc;
5955
5956 unwind:
5957         for(; rc > 0; rc--)
5958                 __free_page(spages[rc-1]);
5959         return -ENOMEM;
5960 }
5961
5962 struct nfs4_cached_acl {
5963         enum nfs4_acl_type type;
5964         int cached;
5965         size_t len;
5966         char data[];
5967 };
5968
5969 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5970 {
5971         struct nfs_inode *nfsi = NFS_I(inode);
5972
5973         spin_lock(&inode->i_lock);
5974         kfree(nfsi->nfs4_acl);
5975         nfsi->nfs4_acl = acl;
5976         spin_unlock(&inode->i_lock);
5977 }
5978
5979 static void nfs4_zap_acl_attr(struct inode *inode)
5980 {
5981         nfs4_set_cached_acl(inode, NULL);
5982 }
5983
5984 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5985                                     size_t buflen, enum nfs4_acl_type type)
5986 {
5987         struct nfs_inode *nfsi = NFS_I(inode);
5988         struct nfs4_cached_acl *acl;
5989         int ret = -ENOENT;
5990
5991         spin_lock(&inode->i_lock);
5992         acl = nfsi->nfs4_acl;
5993         if (acl == NULL)
5994                 goto out;
5995         if (acl->type != type)
5996                 goto out;
5997         if (buf == NULL) /* user is just asking for length */
5998                 goto out_len;
5999         if (acl->cached == 0)
6000                 goto out;
6001         ret = -ERANGE; /* see getxattr(2) man page */
6002         if (acl->len > buflen)
6003                 goto out;
6004         memcpy(buf, acl->data, acl->len);
6005 out_len:
6006         ret = acl->len;
6007 out:
6008         spin_unlock(&inode->i_lock);
6009         return ret;
6010 }
6011
6012 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
6013                                   size_t pgbase, size_t acl_len,
6014                                   enum nfs4_acl_type type)
6015 {
6016         struct nfs4_cached_acl *acl;
6017         size_t buflen = sizeof(*acl) + acl_len;
6018
6019         if (buflen <= PAGE_SIZE) {
6020                 acl = kmalloc(buflen, GFP_KERNEL);
6021                 if (acl == NULL)
6022                         goto out;
6023                 acl->cached = 1;
6024                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
6025         } else {
6026                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
6027                 if (acl == NULL)
6028                         goto out;
6029                 acl->cached = 0;
6030         }
6031         acl->type = type;
6032         acl->len = acl_len;
6033 out:
6034         nfs4_set_cached_acl(inode, acl);
6035 }
6036
6037 /*
6038  * The getxattr API returns the required buffer length when called with a
6039  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
6040  * the required buf.  On a NULL buf, we send a page of data to the server
6041  * guessing that the ACL request can be serviced by a page. If so, we cache
6042  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
6043  * the cache. If not so, we throw away the page, and cache the required
6044  * length. The next getxattr call will then produce another round trip to
6045  * the server, this time with the input buf of the required size.
6046  */
6047 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
6048                                        size_t buflen, enum nfs4_acl_type type)
6049 {
6050         struct page **pages;
6051         struct nfs_getaclargs args = {
6052                 .fh = NFS_FH(inode),
6053                 .acl_type = type,
6054                 .acl_len = buflen,
6055         };
6056         struct nfs_getaclres res = {
6057                 .acl_type = type,
6058                 .acl_len = buflen,
6059         };
6060         struct rpc_message msg = {
6061                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
6062                 .rpc_argp = &args,
6063                 .rpc_resp = &res,
6064         };
6065         unsigned int npages;
6066         int ret = -ENOMEM, i;
6067         struct nfs_server *server = NFS_SERVER(inode);
6068
6069         if (buflen == 0)
6070                 buflen = server->rsize;
6071
6072         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
6073         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
6074         if (!pages)
6075                 return -ENOMEM;
6076
6077         args.acl_pages = pages;
6078
6079         for (i = 0; i < npages; i++) {
6080                 pages[i] = alloc_page(GFP_KERNEL);
6081                 if (!pages[i])
6082                         goto out_free;
6083         }
6084
6085         /* for decoding across pages */
6086         res.acl_scratch = alloc_page(GFP_KERNEL);
6087         if (!res.acl_scratch)
6088                 goto out_free;
6089
6090         args.acl_len = npages * PAGE_SIZE;
6091
6092         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
6093                 __func__, buf, buflen, npages, args.acl_len);
6094         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6095                              &msg, &args.seq_args, &res.seq_res, 0);
6096         if (ret)
6097                 goto out_free;
6098
6099         /* Handle the case where the passed-in buffer is too short */
6100         if (res.acl_flags & NFS4_ACL_TRUNC) {
6101                 /* Did the user only issue a request for the acl length? */
6102                 if (buf == NULL)
6103                         goto out_ok;
6104                 ret = -ERANGE;
6105                 goto out_free;
6106         }
6107         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6108                               type);
6109         if (buf) {
6110                 if (res.acl_len > buflen) {
6111                         ret = -ERANGE;
6112                         goto out_free;
6113                 }
6114                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6115         }
6116 out_ok:
6117         ret = res.acl_len;
6118 out_free:
6119         while (--i >= 0)
6120                 __free_page(pages[i]);
6121         if (res.acl_scratch)
6122                 __free_page(res.acl_scratch);
6123         kfree(pages);
6124         return ret;
6125 }
6126
6127 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6128                                      size_t buflen, enum nfs4_acl_type type)
6129 {
6130         struct nfs4_exception exception = {
6131                 .interruptible = true,
6132         };
6133         ssize_t ret;
6134         do {
6135                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6136                 trace_nfs4_get_acl(inode, ret);
6137                 if (ret >= 0)
6138                         break;
6139                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6140         } while (exception.retry);
6141         return ret;
6142 }
6143
6144 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6145                                  enum nfs4_acl_type type)
6146 {
6147         struct nfs_server *server = NFS_SERVER(inode);
6148         int ret;
6149
6150         if (!nfs4_server_supports_acls(server, type))
6151                 return -EOPNOTSUPP;
6152         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6153         if (ret < 0)
6154                 return ret;
6155         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6156                 nfs_zap_acl_cache(inode);
6157         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6158         if (ret != -ENOENT)
6159                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6160                  * but no cached acl data, just the acl length */
6161                 return ret;
6162         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6163 }
6164
6165 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6166                                size_t buflen, enum nfs4_acl_type type)
6167 {
6168         struct nfs_server *server = NFS_SERVER(inode);
6169         struct page *pages[NFS4ACL_MAXPAGES];
6170         struct nfs_setaclargs arg = {
6171                 .fh = NFS_FH(inode),
6172                 .acl_type = type,
6173                 .acl_len = buflen,
6174                 .acl_pages = pages,
6175         };
6176         struct nfs_setaclres res;
6177         struct rpc_message msg = {
6178                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6179                 .rpc_argp       = &arg,
6180                 .rpc_resp       = &res,
6181         };
6182         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6183         int ret, i;
6184
6185         /* You can't remove system.nfs4_acl: */
6186         if (buflen == 0)
6187                 return -EINVAL;
6188         if (!nfs4_server_supports_acls(server, type))
6189                 return -EOPNOTSUPP;
6190         if (npages > ARRAY_SIZE(pages))
6191                 return -ERANGE;
6192         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6193         if (i < 0)
6194                 return i;
6195         nfs4_inode_make_writeable(inode);
6196         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6197
6198         /*
6199          * Free each page after tx, so the only ref left is
6200          * held by the network stack
6201          */
6202         for (; i > 0; i--)
6203                 put_page(pages[i-1]);
6204
6205         /*
6206          * Acl update can result in inode attribute update.
6207          * so mark the attribute cache invalid.
6208          */
6209         spin_lock(&inode->i_lock);
6210         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6211                                              NFS_INO_INVALID_CTIME |
6212                                              NFS_INO_REVAL_FORCED);
6213         spin_unlock(&inode->i_lock);
6214         nfs_access_zap_cache(inode);
6215         nfs_zap_acl_cache(inode);
6216         return ret;
6217 }
6218
6219 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6220                              size_t buflen, enum nfs4_acl_type type)
6221 {
6222         struct nfs4_exception exception = { };
6223         int err;
6224         do {
6225                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6226                 trace_nfs4_set_acl(inode, err);
6227                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6228                         /*
6229                          * no need to retry since the kernel
6230                          * isn't involved in encoding the ACEs.
6231                          */
6232                         err = -EINVAL;
6233                         break;
6234                 }
6235                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6236                                 &exception);
6237         } while (exception.retry);
6238         return err;
6239 }
6240
6241 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6242 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6243                                         size_t buflen)
6244 {
6245         struct nfs_server *server = NFS_SERVER(inode);
6246         struct nfs4_label label = {0, 0, buflen, buf};
6247
6248         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6249         struct nfs_fattr fattr = {
6250                 .label = &label,
6251         };
6252         struct nfs4_getattr_arg arg = {
6253                 .fh             = NFS_FH(inode),
6254                 .bitmask        = bitmask,
6255         };
6256         struct nfs4_getattr_res res = {
6257                 .fattr          = &fattr,
6258                 .server         = server,
6259         };
6260         struct rpc_message msg = {
6261                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6262                 .rpc_argp       = &arg,
6263                 .rpc_resp       = &res,
6264         };
6265         int ret;
6266
6267         nfs_fattr_init(&fattr);
6268
6269         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6270         if (ret)
6271                 return ret;
6272         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6273                 return -ENOENT;
6274         return label.len;
6275 }
6276
6277 static int nfs4_get_security_label(struct inode *inode, void *buf,
6278                                         size_t buflen)
6279 {
6280         struct nfs4_exception exception = {
6281                 .interruptible = true,
6282         };
6283         int err;
6284
6285         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6286                 return -EOPNOTSUPP;
6287
6288         do {
6289                 err = _nfs4_get_security_label(inode, buf, buflen);
6290                 trace_nfs4_get_security_label(inode, err);
6291                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6292                                 &exception);
6293         } while (exception.retry);
6294         return err;
6295 }
6296
6297 static int _nfs4_do_set_security_label(struct inode *inode,
6298                 struct nfs4_label *ilabel,
6299                 struct nfs_fattr *fattr)
6300 {
6301
6302         struct iattr sattr = {0};
6303         struct nfs_server *server = NFS_SERVER(inode);
6304         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6305         struct nfs_setattrargs arg = {
6306                 .fh             = NFS_FH(inode),
6307                 .iap            = &sattr,
6308                 .server         = server,
6309                 .bitmask        = bitmask,
6310                 .label          = ilabel,
6311         };
6312         struct nfs_setattrres res = {
6313                 .fattr          = fattr,
6314                 .server         = server,
6315         };
6316         struct rpc_message msg = {
6317                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6318                 .rpc_argp       = &arg,
6319                 .rpc_resp       = &res,
6320         };
6321         int status;
6322
6323         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6324
6325         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6326         if (status)
6327                 dprintk("%s failed: %d\n", __func__, status);
6328
6329         return status;
6330 }
6331
6332 static int nfs4_do_set_security_label(struct inode *inode,
6333                 struct nfs4_label *ilabel,
6334                 struct nfs_fattr *fattr)
6335 {
6336         struct nfs4_exception exception = { };
6337         int err;
6338
6339         do {
6340                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6341                 trace_nfs4_set_security_label(inode, err);
6342                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6343                                 &exception);
6344         } while (exception.retry);
6345         return err;
6346 }
6347
6348 static int
6349 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6350 {
6351         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6352         struct nfs_fattr *fattr;
6353         int status;
6354
6355         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6356                 return -EOPNOTSUPP;
6357
6358         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6359         if (fattr == NULL)
6360                 return -ENOMEM;
6361
6362         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6363         if (status == 0)
6364                 nfs_setsecurity(inode, fattr);
6365
6366         nfs_free_fattr(fattr);
6367         return status;
6368 }
6369 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6370
6371
6372 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6373                                     nfs4_verifier *bootverf)
6374 {
6375         __be32 verf[2];
6376
6377         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6378                 /* An impossible timestamp guarantees this value
6379                  * will never match a generated boot time. */
6380                 verf[0] = cpu_to_be32(U32_MAX);
6381                 verf[1] = cpu_to_be32(U32_MAX);
6382         } else {
6383                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6384                 u64 ns = ktime_to_ns(nn->boot_time);
6385
6386                 verf[0] = cpu_to_be32(ns >> 32);
6387                 verf[1] = cpu_to_be32(ns);
6388         }
6389         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6390 }
6391
6392 static size_t
6393 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6394 {
6395         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6396         struct nfs_netns_client *nn_clp = nn->nfs_client;
6397         const char *id;
6398
6399         buf[0] = '\0';
6400
6401         if (nn_clp) {
6402                 rcu_read_lock();
6403                 id = rcu_dereference(nn_clp->identifier);
6404                 if (id)
6405                         strscpy(buf, id, buflen);
6406                 rcu_read_unlock();
6407         }
6408
6409         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6410                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6411
6412         return strlen(buf);
6413 }
6414
6415 static int
6416 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6417 {
6418         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6419         size_t buflen;
6420         size_t len;
6421         char *str;
6422
6423         if (clp->cl_owner_id != NULL)
6424                 return 0;
6425
6426         rcu_read_lock();
6427         len = 14 +
6428                 strlen(clp->cl_rpcclient->cl_nodename) +
6429                 1 +
6430                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6431                 1;
6432         rcu_read_unlock();
6433
6434         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6435         if (buflen)
6436                 len += buflen + 1;
6437
6438         if (len > NFS4_OPAQUE_LIMIT + 1)
6439                 return -EINVAL;
6440
6441         /*
6442          * Since this string is allocated at mount time, and held until the
6443          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6444          * about a memory-reclaim deadlock.
6445          */
6446         str = kmalloc(len, GFP_KERNEL);
6447         if (!str)
6448                 return -ENOMEM;
6449
6450         rcu_read_lock();
6451         if (buflen)
6452                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6453                           clp->cl_rpcclient->cl_nodename, buf,
6454                           rpc_peeraddr2str(clp->cl_rpcclient,
6455                                            RPC_DISPLAY_ADDR));
6456         else
6457                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6458                           clp->cl_rpcclient->cl_nodename,
6459                           rpc_peeraddr2str(clp->cl_rpcclient,
6460                                            RPC_DISPLAY_ADDR));
6461         rcu_read_unlock();
6462
6463         clp->cl_owner_id = str;
6464         return 0;
6465 }
6466
6467 static int
6468 nfs4_init_uniform_client_string(struct nfs_client *clp)
6469 {
6470         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6471         size_t buflen;
6472         size_t len;
6473         char *str;
6474
6475         if (clp->cl_owner_id != NULL)
6476                 return 0;
6477
6478         len = 10 + 10 + 1 + 10 + 1 +
6479                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6480
6481         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6482         if (buflen)
6483                 len += buflen + 1;
6484
6485         if (len > NFS4_OPAQUE_LIMIT + 1)
6486                 return -EINVAL;
6487
6488         /*
6489          * Since this string is allocated at mount time, and held until the
6490          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6491          * about a memory-reclaim deadlock.
6492          */
6493         str = kmalloc(len, GFP_KERNEL);
6494         if (!str)
6495                 return -ENOMEM;
6496
6497         if (buflen)
6498                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6499                           clp->rpc_ops->version, clp->cl_minorversion,
6500                           buf, clp->cl_rpcclient->cl_nodename);
6501         else
6502                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6503                           clp->rpc_ops->version, clp->cl_minorversion,
6504                           clp->cl_rpcclient->cl_nodename);
6505         clp->cl_owner_id = str;
6506         return 0;
6507 }
6508
6509 /*
6510  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6511  * services.  Advertise one based on the address family of the
6512  * clientaddr.
6513  */
6514 static unsigned int
6515 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6516 {
6517         if (strchr(clp->cl_ipaddr, ':') != NULL)
6518                 return scnprintf(buf, len, "tcp6");
6519         else
6520                 return scnprintf(buf, len, "tcp");
6521 }
6522
6523 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6524 {
6525         struct nfs4_setclientid *sc = calldata;
6526
6527         if (task->tk_status == 0)
6528                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6529 }
6530
6531 static const struct rpc_call_ops nfs4_setclientid_ops = {
6532         .rpc_call_done = nfs4_setclientid_done,
6533 };
6534
6535 /**
6536  * nfs4_proc_setclientid - Negotiate client ID
6537  * @clp: state data structure
6538  * @program: RPC program for NFSv4 callback service
6539  * @port: IP port number for NFS4 callback service
6540  * @cred: credential to use for this call
6541  * @res: where to place the result
6542  *
6543  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6544  */
6545 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6546                 unsigned short port, const struct cred *cred,
6547                 struct nfs4_setclientid_res *res)
6548 {
6549         nfs4_verifier sc_verifier;
6550         struct nfs4_setclientid setclientid = {
6551                 .sc_verifier = &sc_verifier,
6552                 .sc_prog = program,
6553                 .sc_clnt = clp,
6554         };
6555         struct rpc_message msg = {
6556                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6557                 .rpc_argp = &setclientid,
6558                 .rpc_resp = res,
6559                 .rpc_cred = cred,
6560         };
6561         struct rpc_task_setup task_setup_data = {
6562                 .rpc_client = clp->cl_rpcclient,
6563                 .rpc_message = &msg,
6564                 .callback_ops = &nfs4_setclientid_ops,
6565                 .callback_data = &setclientid,
6566                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6567         };
6568         unsigned long now = jiffies;
6569         int status;
6570
6571         /* nfs_client_id4 */
6572         nfs4_init_boot_verifier(clp, &sc_verifier);
6573
6574         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6575                 status = nfs4_init_uniform_client_string(clp);
6576         else
6577                 status = nfs4_init_nonuniform_client_string(clp);
6578
6579         if (status)
6580                 goto out;
6581
6582         /* cb_client4 */
6583         setclientid.sc_netid_len =
6584                                 nfs4_init_callback_netid(clp,
6585                                                 setclientid.sc_netid,
6586                                                 sizeof(setclientid.sc_netid));
6587         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6588                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6589                                 clp->cl_ipaddr, port >> 8, port & 255);
6590
6591         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6592                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6593                 clp->cl_owner_id);
6594
6595         status = nfs4_call_sync_custom(&task_setup_data);
6596         if (setclientid.sc_cred) {
6597                 kfree(clp->cl_acceptor);
6598                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6599                 put_rpccred(setclientid.sc_cred);
6600         }
6601
6602         if (status == 0)
6603                 do_renew_lease(clp, now);
6604 out:
6605         trace_nfs4_setclientid(clp, status);
6606         dprintk("NFS reply setclientid: %d\n", status);
6607         return status;
6608 }
6609
6610 /**
6611  * nfs4_proc_setclientid_confirm - Confirm client ID
6612  * @clp: state data structure
6613  * @arg: result of a previous SETCLIENTID
6614  * @cred: credential to use for this call
6615  *
6616  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6617  */
6618 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6619                 struct nfs4_setclientid_res *arg,
6620                 const struct cred *cred)
6621 {
6622         struct rpc_message msg = {
6623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6624                 .rpc_argp = arg,
6625                 .rpc_cred = cred,
6626         };
6627         int status;
6628
6629         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6630                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6631                 clp->cl_clientid);
6632         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6633                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6634         trace_nfs4_setclientid_confirm(clp, status);
6635         dprintk("NFS reply setclientid_confirm: %d\n", status);
6636         return status;
6637 }
6638
6639 struct nfs4_delegreturndata {
6640         struct nfs4_delegreturnargs args;
6641         struct nfs4_delegreturnres res;
6642         struct nfs_fh fh;
6643         nfs4_stateid stateid;
6644         unsigned long timestamp;
6645         struct {
6646                 struct nfs4_layoutreturn_args arg;
6647                 struct nfs4_layoutreturn_res res;
6648                 struct nfs4_xdr_opaque_data ld_private;
6649                 u32 roc_barrier;
6650                 bool roc;
6651         } lr;
6652         struct nfs4_delegattr sattr;
6653         struct nfs_fattr fattr;
6654         int rpc_status;
6655         struct inode *inode;
6656 };
6657
6658 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6659 {
6660         struct nfs4_delegreturndata *data = calldata;
6661         struct nfs4_exception exception = {
6662                 .inode = data->inode,
6663                 .stateid = &data->stateid,
6664                 .task_is_privileged = data->args.seq_args.sa_privileged,
6665         };
6666
6667         if (!nfs4_sequence_done(task, &data->res.seq_res))
6668                 return;
6669
6670         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6671
6672         /* Handle Layoutreturn errors */
6673         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6674                           &data->res.lr_ret) == -EAGAIN)
6675                 goto out_restart;
6676
6677         if (data->args.sattr_args && task->tk_status != 0) {
6678                 switch(data->res.sattr_ret) {
6679                 case 0:
6680                         data->args.sattr_args = NULL;
6681                         data->res.sattr_res = false;
6682                         break;
6683                 case -NFS4ERR_ADMIN_REVOKED:
6684                 case -NFS4ERR_DELEG_REVOKED:
6685                 case -NFS4ERR_EXPIRED:
6686                 case -NFS4ERR_BAD_STATEID:
6687                         /* Let the main handler below do stateid recovery */
6688                         break;
6689                 case -NFS4ERR_OLD_STATEID:
6690                         if (nfs4_refresh_delegation_stateid(&data->stateid,
6691                                                 data->inode))
6692                                 goto out_restart;
6693                         fallthrough;
6694                 default:
6695                         data->args.sattr_args = NULL;
6696                         data->res.sattr_res = false;
6697                         goto out_restart;
6698                 }
6699         }
6700
6701         switch (task->tk_status) {
6702         case 0:
6703                 renew_lease(data->res.server, data->timestamp);
6704                 break;
6705         case -NFS4ERR_ADMIN_REVOKED:
6706         case -NFS4ERR_DELEG_REVOKED:
6707         case -NFS4ERR_EXPIRED:
6708                 nfs4_free_revoked_stateid(data->res.server,
6709                                 data->args.stateid,
6710                                 task->tk_msg.rpc_cred);
6711                 fallthrough;
6712         case -NFS4ERR_BAD_STATEID:
6713         case -NFS4ERR_STALE_STATEID:
6714         case -ETIMEDOUT:
6715                 task->tk_status = 0;
6716                 break;
6717         case -NFS4ERR_OLD_STATEID:
6718                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6719                         nfs4_stateid_seqid_inc(&data->stateid);
6720                 if (data->args.bitmask) {
6721                         data->args.bitmask = NULL;
6722                         data->res.fattr = NULL;
6723                 }
6724                 goto out_restart;
6725         case -NFS4ERR_ACCESS:
6726                 if (data->args.bitmask) {
6727                         data->args.bitmask = NULL;
6728                         data->res.fattr = NULL;
6729                         goto out_restart;
6730                 }
6731                 fallthrough;
6732         default:
6733                 task->tk_status = nfs4_async_handle_exception(task,
6734                                 data->res.server, task->tk_status,
6735                                 &exception);
6736                 if (exception.retry)
6737                         goto out_restart;
6738         }
6739         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6740         data->rpc_status = task->tk_status;
6741         return;
6742 out_restart:
6743         task->tk_status = 0;
6744         rpc_restart_call_prepare(task);
6745 }
6746
6747 static void nfs4_delegreturn_release(void *calldata)
6748 {
6749         struct nfs4_delegreturndata *data = calldata;
6750         struct inode *inode = data->inode;
6751
6752         if (data->lr.roc)
6753                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6754                                  data->res.lr_ret);
6755         if (inode) {
6756                 nfs4_fattr_set_prechange(&data->fattr,
6757                                          inode_peek_iversion_raw(inode));
6758                 nfs_refresh_inode(inode, &data->fattr);
6759                 nfs_iput_and_deactive(inode);
6760         }
6761         kfree(calldata);
6762 }
6763
6764 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6765 {
6766         struct nfs4_delegreturndata *d_data;
6767         struct pnfs_layout_hdr *lo;
6768
6769         d_data = data;
6770
6771         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6772                 nfs4_sequence_done(task, &d_data->res.seq_res);
6773                 return;
6774         }
6775
6776         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6777         if (lo && !pnfs_layout_is_valid(lo)) {
6778                 d_data->args.lr_args = NULL;
6779                 d_data->res.lr_res = NULL;
6780         }
6781
6782         nfs4_setup_sequence(d_data->res.server->nfs_client,
6783                         &d_data->args.seq_args,
6784                         &d_data->res.seq_res,
6785                         task);
6786 }
6787
6788 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6789         .rpc_call_prepare = nfs4_delegreturn_prepare,
6790         .rpc_call_done = nfs4_delegreturn_done,
6791         .rpc_release = nfs4_delegreturn_release,
6792 };
6793
6794 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6795                                   const nfs4_stateid *stateid,
6796                                   struct nfs_delegation *delegation,
6797                                   int issync)
6798 {
6799         struct nfs4_delegreturndata *data;
6800         struct nfs_server *server = NFS_SERVER(inode);
6801         struct rpc_task *task;
6802         struct rpc_message msg = {
6803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6804                 .rpc_cred = cred,
6805         };
6806         struct rpc_task_setup task_setup_data = {
6807                 .rpc_client = server->client,
6808                 .rpc_message = &msg,
6809                 .callback_ops = &nfs4_delegreturn_ops,
6810                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6811         };
6812         int status = 0;
6813
6814         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6815                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6816
6817         data = kzalloc(sizeof(*data), GFP_KERNEL);
6818         if (data == NULL)
6819                 return -ENOMEM;
6820
6821         nfs4_state_protect(server->nfs_client,
6822                         NFS_SP4_MACH_CRED_CLEANUP,
6823                         &task_setup_data.rpc_client, &msg);
6824
6825         data->args.fhandle = &data->fh;
6826         data->args.stateid = &data->stateid;
6827         nfs4_bitmask_set(data->args.bitmask_store,
6828                          server->cache_consistency_bitmask, inode, 0);
6829         data->args.bitmask = data->args.bitmask_store;
6830         nfs_copy_fh(&data->fh, NFS_FH(inode));
6831         nfs4_stateid_copy(&data->stateid, stateid);
6832         data->res.fattr = &data->fattr;
6833         data->res.server = server;
6834         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6835         data->lr.arg.ld_private = &data->lr.ld_private;
6836         nfs_fattr_init(data->res.fattr);
6837         data->timestamp = jiffies;
6838         data->rpc_status = 0;
6839         data->inode = nfs_igrab_and_active(inode);
6840         if (data->inode || issync) {
6841                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6842                                         cred);
6843                 if (data->lr.roc) {
6844                         data->args.lr_args = &data->lr.arg;
6845                         data->res.lr_res = &data->lr.res;
6846                 }
6847         }
6848
6849         if (delegation &&
6850             test_bit(NFS_DELEGATION_DELEGTIME, &delegation->flags)) {
6851                 if (delegation->type & FMODE_READ) {
6852                         data->sattr.atime = inode_get_atime(inode);
6853                         data->sattr.atime_set = true;
6854                 }
6855                 if (delegation->type & FMODE_WRITE) {
6856                         data->sattr.mtime = inode_get_mtime(inode);
6857                         data->sattr.mtime_set = true;
6858                 }
6859                 data->args.sattr_args = &data->sattr;
6860                 data->res.sattr_res = true;
6861         }
6862
6863         if (!data->inode)
6864                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6865                                    1);
6866         else
6867                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6868                                    0);
6869
6870         task_setup_data.callback_data = data;
6871         msg.rpc_argp = &data->args;
6872         msg.rpc_resp = &data->res;
6873         task = rpc_run_task(&task_setup_data);
6874         if (IS_ERR(task))
6875                 return PTR_ERR(task);
6876         if (!issync)
6877                 goto out;
6878         status = rpc_wait_for_completion_task(task);
6879         if (status != 0)
6880                 goto out;
6881         status = data->rpc_status;
6882 out:
6883         rpc_put_task(task);
6884         return status;
6885 }
6886
6887 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred,
6888                           const nfs4_stateid *stateid,
6889                           struct nfs_delegation *delegation, int issync)
6890 {
6891         struct nfs_server *server = NFS_SERVER(inode);
6892         struct nfs4_exception exception = { };
6893         int err;
6894         do {
6895                 err = _nfs4_proc_delegreturn(inode, cred, stateid,
6896                                              delegation, issync);
6897                 trace_nfs4_delegreturn(inode, stateid, err);
6898                 switch (err) {
6899                         case -NFS4ERR_STALE_STATEID:
6900                         case -NFS4ERR_EXPIRED:
6901                         case 0:
6902                                 return 0;
6903                 }
6904                 err = nfs4_handle_exception(server, err, &exception);
6905         } while (exception.retry);
6906         return err;
6907 }
6908
6909 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6910 {
6911         struct inode *inode = state->inode;
6912         struct nfs_server *server = NFS_SERVER(inode);
6913         struct nfs_client *clp = server->nfs_client;
6914         struct nfs_lockt_args arg = {
6915                 .fh = NFS_FH(inode),
6916                 .fl = request,
6917         };
6918         struct nfs_lockt_res res = {
6919                 .denied = request,
6920         };
6921         struct rpc_message msg = {
6922                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6923                 .rpc_argp       = &arg,
6924                 .rpc_resp       = &res,
6925                 .rpc_cred       = state->owner->so_cred,
6926         };
6927         struct nfs4_lock_state *lsp;
6928         int status;
6929
6930         arg.lock_owner.clientid = clp->cl_clientid;
6931         status = nfs4_set_lock_state(state, request);
6932         if (status != 0)
6933                 goto out;
6934         lsp = request->fl_u.nfs4_fl.owner;
6935         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6936         arg.lock_owner.s_dev = server->s_dev;
6937         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6938         switch (status) {
6939                 case 0:
6940                         request->c.flc_type = F_UNLCK;
6941                         break;
6942                 case -NFS4ERR_DENIED:
6943                         status = 0;
6944         }
6945         request->fl_ops->fl_release_private(request);
6946         request->fl_ops = NULL;
6947 out:
6948         return status;
6949 }
6950
6951 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6952 {
6953         struct nfs4_exception exception = {
6954                 .interruptible = true,
6955         };
6956         int err;
6957
6958         do {
6959                 err = _nfs4_proc_getlk(state, cmd, request);
6960                 trace_nfs4_get_lock(request, state, cmd, err);
6961                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6962                                 &exception);
6963         } while (exception.retry);
6964         return err;
6965 }
6966
6967 /*
6968  * Update the seqid of a lock stateid after receiving
6969  * NFS4ERR_OLD_STATEID
6970  */
6971 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6972                 struct nfs4_lock_state *lsp)
6973 {
6974         struct nfs4_state *state = lsp->ls_state;
6975         bool ret = false;
6976
6977         spin_lock(&state->state_lock);
6978         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6979                 goto out;
6980         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6981                 nfs4_stateid_seqid_inc(dst);
6982         else
6983                 dst->seqid = lsp->ls_stateid.seqid;
6984         ret = true;
6985 out:
6986         spin_unlock(&state->state_lock);
6987         return ret;
6988 }
6989
6990 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6991                 struct nfs4_lock_state *lsp)
6992 {
6993         struct nfs4_state *state = lsp->ls_state;
6994         bool ret;
6995
6996         spin_lock(&state->state_lock);
6997         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6998         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6999         spin_unlock(&state->state_lock);
7000         return ret;
7001 }
7002
7003 struct nfs4_unlockdata {
7004         struct nfs_locku_args arg;
7005         struct nfs_locku_res res;
7006         struct nfs4_lock_state *lsp;
7007         struct nfs_open_context *ctx;
7008         struct nfs_lock_context *l_ctx;
7009         struct file_lock fl;
7010         struct nfs_server *server;
7011         unsigned long timestamp;
7012 };
7013
7014 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
7015                 struct nfs_open_context *ctx,
7016                 struct nfs4_lock_state *lsp,
7017                 struct nfs_seqid *seqid)
7018 {
7019         struct nfs4_unlockdata *p;
7020         struct nfs4_state *state = lsp->ls_state;
7021         struct inode *inode = state->inode;
7022
7023         p = kzalloc(sizeof(*p), GFP_KERNEL);
7024         if (p == NULL)
7025                 return NULL;
7026         p->arg.fh = NFS_FH(inode);
7027         p->arg.fl = &p->fl;
7028         p->arg.seqid = seqid;
7029         p->res.seqid = seqid;
7030         p->lsp = lsp;
7031         /* Ensure we don't close file until we're done freeing locks! */
7032         p->ctx = get_nfs_open_context(ctx);
7033         p->l_ctx = nfs_get_lock_context(ctx);
7034         locks_init_lock(&p->fl);
7035         locks_copy_lock(&p->fl, fl);
7036         p->server = NFS_SERVER(inode);
7037         spin_lock(&state->state_lock);
7038         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
7039         spin_unlock(&state->state_lock);
7040         return p;
7041 }
7042
7043 static void nfs4_locku_release_calldata(void *data)
7044 {
7045         struct nfs4_unlockdata *calldata = data;
7046         nfs_free_seqid(calldata->arg.seqid);
7047         nfs4_put_lock_state(calldata->lsp);
7048         nfs_put_lock_context(calldata->l_ctx);
7049         put_nfs_open_context(calldata->ctx);
7050         kfree(calldata);
7051 }
7052
7053 static void nfs4_locku_done(struct rpc_task *task, void *data)
7054 {
7055         struct nfs4_unlockdata *calldata = data;
7056         struct nfs4_exception exception = {
7057                 .inode = calldata->lsp->ls_state->inode,
7058                 .stateid = &calldata->arg.stateid,
7059         };
7060
7061         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
7062                 return;
7063         switch (task->tk_status) {
7064                 case 0:
7065                         renew_lease(calldata->server, calldata->timestamp);
7066                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
7067                         if (nfs4_update_lock_stateid(calldata->lsp,
7068                                         &calldata->res.stateid))
7069                                 break;
7070                         fallthrough;
7071                 case -NFS4ERR_ADMIN_REVOKED:
7072                 case -NFS4ERR_EXPIRED:
7073                         nfs4_free_revoked_stateid(calldata->server,
7074                                         &calldata->arg.stateid,
7075                                         task->tk_msg.rpc_cred);
7076                         fallthrough;
7077                 case -NFS4ERR_BAD_STATEID:
7078                 case -NFS4ERR_STALE_STATEID:
7079                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
7080                                                 calldata->lsp))
7081                                 rpc_restart_call_prepare(task);
7082                         break;
7083                 case -NFS4ERR_OLD_STATEID:
7084                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
7085                                                 calldata->lsp))
7086                                 rpc_restart_call_prepare(task);
7087                         break;
7088                 default:
7089                         task->tk_status = nfs4_async_handle_exception(task,
7090                                         calldata->server, task->tk_status,
7091                                         &exception);
7092                         if (exception.retry)
7093                                 rpc_restart_call_prepare(task);
7094         }
7095         nfs_release_seqid(calldata->arg.seqid);
7096 }
7097
7098 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
7099 {
7100         struct nfs4_unlockdata *calldata = data;
7101
7102         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
7103                 nfs_async_iocounter_wait(task, calldata->l_ctx))
7104                 return;
7105
7106         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
7107                 goto out_wait;
7108         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
7109                 /* Note: exit _without_ running nfs4_locku_done */
7110                 goto out_no_action;
7111         }
7112         calldata->timestamp = jiffies;
7113         if (nfs4_setup_sequence(calldata->server->nfs_client,
7114                                 &calldata->arg.seq_args,
7115                                 &calldata->res.seq_res,
7116                                 task) != 0)
7117                 nfs_release_seqid(calldata->arg.seqid);
7118         return;
7119 out_no_action:
7120         task->tk_action = NULL;
7121 out_wait:
7122         nfs4_sequence_done(task, &calldata->res.seq_res);
7123 }
7124
7125 static const struct rpc_call_ops nfs4_locku_ops = {
7126         .rpc_call_prepare = nfs4_locku_prepare,
7127         .rpc_call_done = nfs4_locku_done,
7128         .rpc_release = nfs4_locku_release_calldata,
7129 };
7130
7131 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
7132                 struct nfs_open_context *ctx,
7133                 struct nfs4_lock_state *lsp,
7134                 struct nfs_seqid *seqid)
7135 {
7136         struct nfs4_unlockdata *data;
7137         struct rpc_message msg = {
7138                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
7139                 .rpc_cred = ctx->cred,
7140         };
7141         struct rpc_task_setup task_setup_data = {
7142                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7143                 .rpc_message = &msg,
7144                 .callback_ops = &nfs4_locku_ops,
7145                 .workqueue = nfsiod_workqueue,
7146                 .flags = RPC_TASK_ASYNC,
7147         };
7148
7149         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7150                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7151
7152         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
7153                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
7154
7155         /* Ensure this is an unlock - when canceling a lock, the
7156          * canceled lock is passed in, and it won't be an unlock.
7157          */
7158         fl->c.flc_type = F_UNLCK;
7159         if (fl->c.flc_flags & FL_CLOSE)
7160                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7161
7162         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7163         if (data == NULL) {
7164                 nfs_free_seqid(seqid);
7165                 return ERR_PTR(-ENOMEM);
7166         }
7167
7168         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7169         msg.rpc_argp = &data->arg;
7170         msg.rpc_resp = &data->res;
7171         task_setup_data.callback_data = data;
7172         return rpc_run_task(&task_setup_data);
7173 }
7174
7175 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7176 {
7177         struct inode *inode = state->inode;
7178         struct nfs4_state_owner *sp = state->owner;
7179         struct nfs_inode *nfsi = NFS_I(inode);
7180         struct nfs_seqid *seqid;
7181         struct nfs4_lock_state *lsp;
7182         struct rpc_task *task;
7183         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7184         int status = 0;
7185         unsigned char saved_flags = request->c.flc_flags;
7186
7187         status = nfs4_set_lock_state(state, request);
7188         /* Unlock _before_ we do the RPC call */
7189         request->c.flc_flags |= FL_EXISTS;
7190         /* Exclude nfs_delegation_claim_locks() */
7191         mutex_lock(&sp->so_delegreturn_mutex);
7192         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7193         down_read(&nfsi->rwsem);
7194         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7195                 up_read(&nfsi->rwsem);
7196                 mutex_unlock(&sp->so_delegreturn_mutex);
7197                 goto out;
7198         }
7199         lsp = request->fl_u.nfs4_fl.owner;
7200         set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7201         up_read(&nfsi->rwsem);
7202         mutex_unlock(&sp->so_delegreturn_mutex);
7203         if (status != 0)
7204                 goto out;
7205         /* Is this a delegated lock? */
7206         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7207                 goto out;
7208         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7209         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7210         status = -ENOMEM;
7211         if (IS_ERR(seqid))
7212                 goto out;
7213         task = nfs4_do_unlck(request,
7214                              nfs_file_open_context(request->c.flc_file),
7215                              lsp, seqid);
7216         status = PTR_ERR(task);
7217         if (IS_ERR(task))
7218                 goto out;
7219         status = rpc_wait_for_completion_task(task);
7220         rpc_put_task(task);
7221 out:
7222         request->c.flc_flags = saved_flags;
7223         trace_nfs4_unlock(request, state, F_SETLK, status);
7224         return status;
7225 }
7226
7227 struct nfs4_lockdata {
7228         struct nfs_lock_args arg;
7229         struct nfs_lock_res res;
7230         struct nfs4_lock_state *lsp;
7231         struct nfs_open_context *ctx;
7232         struct file_lock fl;
7233         unsigned long timestamp;
7234         int rpc_status;
7235         int cancelled;
7236         struct nfs_server *server;
7237 };
7238
7239 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7240                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7241                 gfp_t gfp_mask)
7242 {
7243         struct nfs4_lockdata *p;
7244         struct inode *inode = lsp->ls_state->inode;
7245         struct nfs_server *server = NFS_SERVER(inode);
7246         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7247
7248         p = kzalloc(sizeof(*p), gfp_mask);
7249         if (p == NULL)
7250                 return NULL;
7251
7252         p->arg.fh = NFS_FH(inode);
7253         p->arg.fl = &p->fl;
7254         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7255         if (IS_ERR(p->arg.open_seqid))
7256                 goto out_free;
7257         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7258         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7259         if (IS_ERR(p->arg.lock_seqid))
7260                 goto out_free_seqid;
7261         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7262         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7263         p->arg.lock_owner.s_dev = server->s_dev;
7264         p->res.lock_seqid = p->arg.lock_seqid;
7265         p->lsp = lsp;
7266         p->server = server;
7267         p->ctx = get_nfs_open_context(ctx);
7268         locks_init_lock(&p->fl);
7269         locks_copy_lock(&p->fl, fl);
7270         return p;
7271 out_free_seqid:
7272         nfs_free_seqid(p->arg.open_seqid);
7273 out_free:
7274         kfree(p);
7275         return NULL;
7276 }
7277
7278 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7279 {
7280         struct nfs4_lockdata *data = calldata;
7281         struct nfs4_state *state = data->lsp->ls_state;
7282
7283         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7284                 goto out_wait;
7285         /* Do we need to do an open_to_lock_owner? */
7286         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7287                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7288                         goto out_release_lock_seqid;
7289                 }
7290                 nfs4_stateid_copy(&data->arg.open_stateid,
7291                                 &state->open_stateid);
7292                 data->arg.new_lock_owner = 1;
7293                 data->res.open_seqid = data->arg.open_seqid;
7294         } else {
7295                 data->arg.new_lock_owner = 0;
7296                 nfs4_stateid_copy(&data->arg.lock_stateid,
7297                                 &data->lsp->ls_stateid);
7298         }
7299         if (!nfs4_valid_open_stateid(state)) {
7300                 data->rpc_status = -EBADF;
7301                 task->tk_action = NULL;
7302                 goto out_release_open_seqid;
7303         }
7304         data->timestamp = jiffies;
7305         if (nfs4_setup_sequence(data->server->nfs_client,
7306                                 &data->arg.seq_args,
7307                                 &data->res.seq_res,
7308                                 task) == 0)
7309                 return;
7310 out_release_open_seqid:
7311         nfs_release_seqid(data->arg.open_seqid);
7312 out_release_lock_seqid:
7313         nfs_release_seqid(data->arg.lock_seqid);
7314 out_wait:
7315         nfs4_sequence_done(task, &data->res.seq_res);
7316         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7317 }
7318
7319 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7320 {
7321         struct nfs4_lockdata *data = calldata;
7322         struct nfs4_lock_state *lsp = data->lsp;
7323
7324         if (!nfs4_sequence_done(task, &data->res.seq_res))
7325                 return;
7326
7327         data->rpc_status = task->tk_status;
7328         switch (task->tk_status) {
7329         case 0:
7330                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7331                                 data->timestamp);
7332                 if (data->arg.new_lock && !data->cancelled) {
7333                         data->fl.c.flc_flags &= ~(FL_SLEEP | FL_ACCESS);
7334                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7335                                 goto out_restart;
7336                 }
7337                 if (data->arg.new_lock_owner != 0) {
7338                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7339                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7340                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7341                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7342                         goto out_restart;
7343                 break;
7344         case -NFS4ERR_OLD_STATEID:
7345                 if (data->arg.new_lock_owner != 0 &&
7346                         nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7347                                         lsp->ls_state))
7348                         goto out_restart;
7349                 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7350                         goto out_restart;
7351                 fallthrough;
7352         case -NFS4ERR_BAD_STATEID:
7353         case -NFS4ERR_STALE_STATEID:
7354         case -NFS4ERR_EXPIRED:
7355                 if (data->arg.new_lock_owner != 0) {
7356                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7357                                                 &lsp->ls_state->open_stateid))
7358                                 goto out_restart;
7359                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7360                                                 &lsp->ls_stateid))
7361                                 goto out_restart;
7362         }
7363 out_done:
7364         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7365         return;
7366 out_restart:
7367         if (!data->cancelled)
7368                 rpc_restart_call_prepare(task);
7369         goto out_done;
7370 }
7371
7372 static void nfs4_lock_release(void *calldata)
7373 {
7374         struct nfs4_lockdata *data = calldata;
7375
7376         nfs_free_seqid(data->arg.open_seqid);
7377         if (data->cancelled && data->rpc_status == 0) {
7378                 struct rpc_task *task;
7379                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7380                                 data->arg.lock_seqid);
7381                 if (!IS_ERR(task))
7382                         rpc_put_task_async(task);
7383                 dprintk("%s: cancelling lock!\n", __func__);
7384         } else
7385                 nfs_free_seqid(data->arg.lock_seqid);
7386         nfs4_put_lock_state(data->lsp);
7387         put_nfs_open_context(data->ctx);
7388         kfree(data);
7389 }
7390
7391 static const struct rpc_call_ops nfs4_lock_ops = {
7392         .rpc_call_prepare = nfs4_lock_prepare,
7393         .rpc_call_done = nfs4_lock_done,
7394         .rpc_release = nfs4_lock_release,
7395 };
7396
7397 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7398 {
7399         switch (error) {
7400         case -NFS4ERR_ADMIN_REVOKED:
7401         case -NFS4ERR_EXPIRED:
7402         case -NFS4ERR_BAD_STATEID:
7403                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7404                 if (new_lock_owner != 0 ||
7405                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7406                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7407                 break;
7408         case -NFS4ERR_STALE_STATEID:
7409                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7410                 nfs4_schedule_lease_recovery(server->nfs_client);
7411         }
7412 }
7413
7414 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7415 {
7416         struct nfs4_lockdata *data;
7417         struct rpc_task *task;
7418         struct rpc_message msg = {
7419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7420                 .rpc_cred = state->owner->so_cred,
7421         };
7422         struct rpc_task_setup task_setup_data = {
7423                 .rpc_client = NFS_CLIENT(state->inode),
7424                 .rpc_message = &msg,
7425                 .callback_ops = &nfs4_lock_ops,
7426                 .workqueue = nfsiod_workqueue,
7427                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7428         };
7429         int ret;
7430
7431         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7432                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7433
7434         data = nfs4_alloc_lockdata(fl,
7435                                    nfs_file_open_context(fl->c.flc_file),
7436                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7437         if (data == NULL)
7438                 return -ENOMEM;
7439         if (IS_SETLKW(cmd))
7440                 data->arg.block = 1;
7441         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7442                                 recovery_type > NFS_LOCK_NEW);
7443         msg.rpc_argp = &data->arg;
7444         msg.rpc_resp = &data->res;
7445         task_setup_data.callback_data = data;
7446         if (recovery_type > NFS_LOCK_NEW) {
7447                 if (recovery_type == NFS_LOCK_RECLAIM)
7448                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7449         } else
7450                 data->arg.new_lock = 1;
7451         task = rpc_run_task(&task_setup_data);
7452         if (IS_ERR(task))
7453                 return PTR_ERR(task);
7454         ret = rpc_wait_for_completion_task(task);
7455         if (ret == 0) {
7456                 ret = data->rpc_status;
7457                 if (ret)
7458                         nfs4_handle_setlk_error(data->server, data->lsp,
7459                                         data->arg.new_lock_owner, ret);
7460         } else
7461                 data->cancelled = true;
7462         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7463         rpc_put_task(task);
7464         dprintk("%s: ret = %d\n", __func__, ret);
7465         return ret;
7466 }
7467
7468 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7469 {
7470         struct nfs_server *server = NFS_SERVER(state->inode);
7471         struct nfs4_exception exception = {
7472                 .inode = state->inode,
7473         };
7474         int err;
7475
7476         do {
7477                 /* Cache the lock if possible... */
7478                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7479                         return 0;
7480                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7481                 if (err != -NFS4ERR_DELAY)
7482                         break;
7483                 nfs4_handle_exception(server, err, &exception);
7484         } while (exception.retry);
7485         return err;
7486 }
7487
7488 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7489 {
7490         struct nfs_server *server = NFS_SERVER(state->inode);
7491         struct nfs4_exception exception = {
7492                 .inode = state->inode,
7493         };
7494         int err;
7495
7496         err = nfs4_set_lock_state(state, request);
7497         if (err != 0)
7498                 return err;
7499         if (!recover_lost_locks) {
7500                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7501                 return 0;
7502         }
7503         do {
7504                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7505                         return 0;
7506                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7507                 switch (err) {
7508                 default:
7509                         goto out;
7510                 case -NFS4ERR_GRACE:
7511                 case -NFS4ERR_DELAY:
7512                         nfs4_handle_exception(server, err, &exception);
7513                         err = 0;
7514                 }
7515         } while (exception.retry);
7516 out:
7517         return err;
7518 }
7519
7520 #if defined(CONFIG_NFS_V4_1)
7521 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7522 {
7523         struct nfs4_lock_state *lsp;
7524         int status;
7525
7526         status = nfs4_set_lock_state(state, request);
7527         if (status != 0)
7528                 return status;
7529         lsp = request->fl_u.nfs4_fl.owner;
7530         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7531             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7532                 return 0;
7533         return nfs4_lock_expired(state, request);
7534 }
7535 #endif
7536
7537 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7538 {
7539         struct nfs_inode *nfsi = NFS_I(state->inode);
7540         struct nfs4_state_owner *sp = state->owner;
7541         unsigned char flags = request->c.flc_flags;
7542         int status;
7543
7544         request->c.flc_flags |= FL_ACCESS;
7545         status = locks_lock_inode_wait(state->inode, request);
7546         if (status < 0)
7547                 goto out;
7548         mutex_lock(&sp->so_delegreturn_mutex);
7549         down_read(&nfsi->rwsem);
7550         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7551                 /* Yes: cache locks! */
7552                 /* ...but avoid races with delegation recall... */
7553                 request->c.flc_flags = flags & ~FL_SLEEP;
7554                 status = locks_lock_inode_wait(state->inode, request);
7555                 up_read(&nfsi->rwsem);
7556                 mutex_unlock(&sp->so_delegreturn_mutex);
7557                 goto out;
7558         }
7559         up_read(&nfsi->rwsem);
7560         mutex_unlock(&sp->so_delegreturn_mutex);
7561         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7562 out:
7563         request->c.flc_flags = flags;
7564         return status;
7565 }
7566
7567 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7568 {
7569         struct nfs4_exception exception = {
7570                 .state = state,
7571                 .inode = state->inode,
7572                 .interruptible = true,
7573         };
7574         int err;
7575
7576         do {
7577                 err = _nfs4_proc_setlk(state, cmd, request);
7578                 if (err == -NFS4ERR_DENIED)
7579                         err = -EAGAIN;
7580                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7581                                 err, &exception);
7582         } while (exception.retry);
7583         return err;
7584 }
7585
7586 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7587 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7588
7589 static int
7590 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7591                         struct file_lock *request)
7592 {
7593         int             status = -ERESTARTSYS;
7594         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7595
7596         while(!signalled()) {
7597                 status = nfs4_proc_setlk(state, cmd, request);
7598                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7599                         break;
7600                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7601                 schedule_timeout(timeout);
7602                 timeout *= 2;
7603                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7604                 status = -ERESTARTSYS;
7605         }
7606         return status;
7607 }
7608
7609 #ifdef CONFIG_NFS_V4_1
7610 struct nfs4_lock_waiter {
7611         struct inode            *inode;
7612         struct nfs_lowner       owner;
7613         wait_queue_entry_t      wait;
7614 };
7615
7616 static int
7617 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7618 {
7619         struct nfs4_lock_waiter *waiter =
7620                 container_of(wait, struct nfs4_lock_waiter, wait);
7621
7622         /* NULL key means to wake up everyone */
7623         if (key) {
7624                 struct cb_notify_lock_args      *cbnl = key;
7625                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7626                                                 *wowner = &waiter->owner;
7627
7628                 /* Only wake if the callback was for the same owner. */
7629                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7630                         return 0;
7631
7632                 /* Make sure it's for the right inode */
7633                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7634                         return 0;
7635         }
7636
7637         return woken_wake_function(wait, mode, flags, key);
7638 }
7639
7640 static int
7641 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7642 {
7643         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7644         struct nfs_server *server = NFS_SERVER(state->inode);
7645         struct nfs_client *clp = server->nfs_client;
7646         wait_queue_head_t *q = &clp->cl_lock_waitq;
7647         struct nfs4_lock_waiter waiter = {
7648                 .inode = state->inode,
7649                 .owner = { .clientid = clp->cl_clientid,
7650                            .id = lsp->ls_seqid.owner_id,
7651                            .s_dev = server->s_dev },
7652         };
7653         int status;
7654
7655         /* Don't bother with waitqueue if we don't expect a callback */
7656         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7657                 return nfs4_retry_setlk_simple(state, cmd, request);
7658
7659         init_wait(&waiter.wait);
7660         waiter.wait.func = nfs4_wake_lock_waiter;
7661         add_wait_queue(q, &waiter.wait);
7662
7663         do {
7664                 status = nfs4_proc_setlk(state, cmd, request);
7665                 if (status != -EAGAIN || IS_SETLK(cmd))
7666                         break;
7667
7668                 status = -ERESTARTSYS;
7669                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7670                            NFS4_LOCK_MAXTIMEOUT);
7671         } while (!signalled());
7672
7673         remove_wait_queue(q, &waiter.wait);
7674
7675         return status;
7676 }
7677 #else /* !CONFIG_NFS_V4_1 */
7678 static inline int
7679 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7680 {
7681         return nfs4_retry_setlk_simple(state, cmd, request);
7682 }
7683 #endif
7684
7685 static int
7686 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7687 {
7688         struct nfs_open_context *ctx;
7689         struct nfs4_state *state;
7690         int status;
7691
7692         /* verify open state */
7693         ctx = nfs_file_open_context(filp);
7694         state = ctx->state;
7695
7696         if (IS_GETLK(cmd)) {
7697                 if (state != NULL)
7698                         return nfs4_proc_getlk(state, F_GETLK, request);
7699                 return 0;
7700         }
7701
7702         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7703                 return -EINVAL;
7704
7705         if (lock_is_unlock(request)) {
7706                 if (state != NULL)
7707                         return nfs4_proc_unlck(state, cmd, request);
7708                 return 0;
7709         }
7710
7711         if (state == NULL)
7712                 return -ENOLCK;
7713
7714         if ((request->c.flc_flags & FL_POSIX) &&
7715             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7716                 return -ENOLCK;
7717
7718         /*
7719          * Don't rely on the VFS having checked the file open mode,
7720          * since it won't do this for flock() locks.
7721          */
7722         switch (request->c.flc_type) {
7723         case F_RDLCK:
7724                 if (!(filp->f_mode & FMODE_READ))
7725                         return -EBADF;
7726                 break;
7727         case F_WRLCK:
7728                 if (!(filp->f_mode & FMODE_WRITE))
7729                         return -EBADF;
7730         }
7731
7732         status = nfs4_set_lock_state(state, request);
7733         if (status != 0)
7734                 return status;
7735
7736         return nfs4_retry_setlk(state, cmd, request);
7737 }
7738
7739 static int nfs4_delete_lease(struct file *file, void **priv)
7740 {
7741         return generic_setlease(file, F_UNLCK, NULL, priv);
7742 }
7743
7744 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease,
7745                           void **priv)
7746 {
7747         struct inode *inode = file_inode(file);
7748         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7749         int ret;
7750
7751         /* No delegation, no lease */
7752         if (!nfs4_have_delegation(inode, type, 0))
7753                 return -EAGAIN;
7754         ret = generic_setlease(file, arg, lease, priv);
7755         if (ret || nfs4_have_delegation(inode, type, 0))
7756                 return ret;
7757         /* We raced with a delegation return */
7758         nfs4_delete_lease(file, priv);
7759         return -EAGAIN;
7760 }
7761
7762 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease,
7763                        void **priv)
7764 {
7765         switch (arg) {
7766         case F_RDLCK:
7767         case F_WRLCK:
7768                 return nfs4_add_lease(file, arg, lease, priv);
7769         case F_UNLCK:
7770                 return nfs4_delete_lease(file, priv);
7771         default:
7772                 return -EINVAL;
7773         }
7774 }
7775
7776 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7777 {
7778         struct nfs_server *server = NFS_SERVER(state->inode);
7779         int err;
7780
7781         err = nfs4_set_lock_state(state, fl);
7782         if (err != 0)
7783                 return err;
7784         do {
7785                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7786                 if (err != -NFS4ERR_DELAY)
7787                         break;
7788                 ssleep(1);
7789         } while (err == -NFS4ERR_DELAY);
7790         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7791 }
7792
7793 struct nfs_release_lockowner_data {
7794         struct nfs4_lock_state *lsp;
7795         struct nfs_server *server;
7796         struct nfs_release_lockowner_args args;
7797         struct nfs_release_lockowner_res res;
7798         unsigned long timestamp;
7799 };
7800
7801 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7802 {
7803         struct nfs_release_lockowner_data *data = calldata;
7804         struct nfs_server *server = data->server;
7805         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7806                            &data->res.seq_res, task);
7807         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7808         data->timestamp = jiffies;
7809 }
7810
7811 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7812 {
7813         struct nfs_release_lockowner_data *data = calldata;
7814         struct nfs_server *server = data->server;
7815
7816         nfs40_sequence_done(task, &data->res.seq_res);
7817
7818         switch (task->tk_status) {
7819         case 0:
7820                 renew_lease(server, data->timestamp);
7821                 break;
7822         case -NFS4ERR_STALE_CLIENTID:
7823         case -NFS4ERR_EXPIRED:
7824                 nfs4_schedule_lease_recovery(server->nfs_client);
7825                 break;
7826         case -NFS4ERR_LEASE_MOVED:
7827         case -NFS4ERR_DELAY:
7828                 if (nfs4_async_handle_error(task, server,
7829                                             NULL, NULL) == -EAGAIN)
7830                         rpc_restart_call_prepare(task);
7831         }
7832 }
7833
7834 static void nfs4_release_lockowner_release(void *calldata)
7835 {
7836         struct nfs_release_lockowner_data *data = calldata;
7837         nfs4_free_lock_state(data->server, data->lsp);
7838         kfree(calldata);
7839 }
7840
7841 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7842         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7843         .rpc_call_done = nfs4_release_lockowner_done,
7844         .rpc_release = nfs4_release_lockowner_release,
7845 };
7846
7847 static void
7848 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7849 {
7850         struct nfs_release_lockowner_data *data;
7851         struct rpc_message msg = {
7852                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7853         };
7854
7855         if (server->nfs_client->cl_mvops->minor_version != 0)
7856                 return;
7857
7858         data = kmalloc(sizeof(*data), GFP_KERNEL);
7859         if (!data)
7860                 return;
7861         data->lsp = lsp;
7862         data->server = server;
7863         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7864         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7865         data->args.lock_owner.s_dev = server->s_dev;
7866
7867         msg.rpc_argp = &data->args;
7868         msg.rpc_resp = &data->res;
7869         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7870         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7871 }
7872
7873 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7874
7875 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7876                                    struct mnt_idmap *idmap,
7877                                    struct dentry *unused, struct inode *inode,
7878                                    const char *key, const void *buf,
7879                                    size_t buflen, int flags)
7880 {
7881         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7882 }
7883
7884 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7885                                    struct dentry *unused, struct inode *inode,
7886                                    const char *key, void *buf, size_t buflen)
7887 {
7888         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7889 }
7890
7891 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7892 {
7893         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7894 }
7895
7896 #if defined(CONFIG_NFS_V4_1)
7897 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7898
7899 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7900                                     struct mnt_idmap *idmap,
7901                                     struct dentry *unused, struct inode *inode,
7902                                     const char *key, const void *buf,
7903                                     size_t buflen, int flags)
7904 {
7905         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7906 }
7907
7908 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7909                                     struct dentry *unused, struct inode *inode,
7910                                     const char *key, void *buf, size_t buflen)
7911 {
7912         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7913 }
7914
7915 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7916 {
7917         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7918 }
7919
7920 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7921
7922 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7923                                     struct mnt_idmap *idmap,
7924                                     struct dentry *unused, struct inode *inode,
7925                                     const char *key, const void *buf,
7926                                     size_t buflen, int flags)
7927 {
7928         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7929 }
7930
7931 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7932                                     struct dentry *unused, struct inode *inode,
7933                                     const char *key, void *buf, size_t buflen)
7934 {
7935         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7936 }
7937
7938 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7939 {
7940         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7941 }
7942
7943 #endif
7944
7945 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7946
7947 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7948                                      struct mnt_idmap *idmap,
7949                                      struct dentry *unused, struct inode *inode,
7950                                      const char *key, const void *buf,
7951                                      size_t buflen, int flags)
7952 {
7953         if (security_ismaclabel(key))
7954                 return nfs4_set_security_label(inode, buf, buflen);
7955
7956         return -EOPNOTSUPP;
7957 }
7958
7959 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7960                                      struct dentry *unused, struct inode *inode,
7961                                      const char *key, void *buf, size_t buflen)
7962 {
7963         if (security_ismaclabel(key))
7964                 return nfs4_get_security_label(inode, buf, buflen);
7965         return -EOPNOTSUPP;
7966 }
7967
7968 static ssize_t
7969 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7970 {
7971         int len = 0;
7972
7973         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7974                 len = security_inode_listsecurity(inode, list, list_len);
7975                 if (len >= 0 && list_len && len > list_len)
7976                         return -ERANGE;
7977         }
7978         return len;
7979 }
7980
7981 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7982         .prefix = XATTR_SECURITY_PREFIX,
7983         .get    = nfs4_xattr_get_nfs4_label,
7984         .set    = nfs4_xattr_set_nfs4_label,
7985 };
7986
7987 #else
7988
7989 static ssize_t
7990 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7991 {
7992         return 0;
7993 }
7994
7995 #endif
7996
7997 #ifdef CONFIG_NFS_V4_2
7998 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7999                                     struct mnt_idmap *idmap,
8000                                     struct dentry *unused, struct inode *inode,
8001                                     const char *key, const void *buf,
8002                                     size_t buflen, int flags)
8003 {
8004         u32 mask;
8005         int ret;
8006
8007         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8008                 return -EOPNOTSUPP;
8009
8010         /*
8011          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
8012          * flags right now. Handling of xattr operations use the normal
8013          * file read/write permissions.
8014          *
8015          * Just in case the server has other ideas (which RFC 8276 allows),
8016          * do a cached access check for the XA* flags to possibly avoid
8017          * doing an RPC and getting EACCES back.
8018          */
8019         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8020                 if (!(mask & NFS_ACCESS_XAWRITE))
8021                         return -EACCES;
8022         }
8023
8024         if (buf == NULL) {
8025                 ret = nfs42_proc_removexattr(inode, key);
8026                 if (!ret)
8027                         nfs4_xattr_cache_remove(inode, key);
8028         } else {
8029                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
8030                 if (!ret)
8031                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
8032         }
8033
8034         return ret;
8035 }
8036
8037 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
8038                                     struct dentry *unused, struct inode *inode,
8039                                     const char *key, void *buf, size_t buflen)
8040 {
8041         u32 mask;
8042         ssize_t ret;
8043
8044         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8045                 return -EOPNOTSUPP;
8046
8047         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8048                 if (!(mask & NFS_ACCESS_XAREAD))
8049                         return -EACCES;
8050         }
8051
8052         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8053         if (ret)
8054                 return ret;
8055
8056         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
8057         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8058                 return ret;
8059
8060         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
8061
8062         return ret;
8063 }
8064
8065 static ssize_t
8066 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8067 {
8068         u64 cookie;
8069         bool eof;
8070         ssize_t ret, size;
8071         char *buf;
8072         size_t buflen;
8073         u32 mask;
8074
8075         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
8076                 return 0;
8077
8078         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
8079                 if (!(mask & NFS_ACCESS_XALIST))
8080                         return 0;
8081         }
8082
8083         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
8084         if (ret)
8085                 return ret;
8086
8087         ret = nfs4_xattr_cache_list(inode, list, list_len);
8088         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
8089                 return ret;
8090
8091         cookie = 0;
8092         eof = false;
8093         buflen = list_len ? list_len : XATTR_LIST_MAX;
8094         buf = list_len ? list : NULL;
8095         size = 0;
8096
8097         while (!eof) {
8098                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
8099                     &cookie, &eof);
8100                 if (ret < 0)
8101                         return ret;
8102
8103                 if (list_len) {
8104                         buf += ret;
8105                         buflen -= ret;
8106                 }
8107                 size += ret;
8108         }
8109
8110         if (list_len)
8111                 nfs4_xattr_cache_set_list(inode, list, size);
8112
8113         return size;
8114 }
8115
8116 #else
8117
8118 static ssize_t
8119 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8120 {
8121         return 0;
8122 }
8123 #endif /* CONFIG_NFS_V4_2 */
8124
8125 /*
8126  * nfs_fhget will use either the mounted_on_fileid or the fileid
8127  */
8128 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
8129 {
8130         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
8131                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
8132               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
8133               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
8134                 return;
8135
8136         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
8137                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
8138         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
8139         fattr->nlink = 2;
8140 }
8141
8142 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8143                                    const struct qstr *name,
8144                                    struct nfs4_fs_locations *fs_locations,
8145                                    struct page *page)
8146 {
8147         struct nfs_server *server = NFS_SERVER(dir);
8148         u32 bitmask[3];
8149         struct nfs4_fs_locations_arg args = {
8150                 .dir_fh = NFS_FH(dir),
8151                 .name = name,
8152                 .page = page,
8153                 .bitmask = bitmask,
8154         };
8155         struct nfs4_fs_locations_res res = {
8156                 .fs_locations = fs_locations,
8157         };
8158         struct rpc_message msg = {
8159                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8160                 .rpc_argp = &args,
8161                 .rpc_resp = &res,
8162         };
8163         int status;
8164
8165         dprintk("%s: start\n", __func__);
8166
8167         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8168         bitmask[1] = nfs4_fattr_bitmap[1];
8169
8170         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8171          * is not supported */
8172         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8173                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8174         else
8175                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8176
8177         nfs_fattr_init(fs_locations->fattr);
8178         fs_locations->server = server;
8179         fs_locations->nlocations = 0;
8180         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8181         dprintk("%s: returned status = %d\n", __func__, status);
8182         return status;
8183 }
8184
8185 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8186                            const struct qstr *name,
8187                            struct nfs4_fs_locations *fs_locations,
8188                            struct page *page)
8189 {
8190         struct nfs4_exception exception = {
8191                 .interruptible = true,
8192         };
8193         int err;
8194         do {
8195                 err = _nfs4_proc_fs_locations(client, dir, name,
8196                                 fs_locations, page);
8197                 trace_nfs4_get_fs_locations(dir, name, err);
8198                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8199                                 &exception);
8200         } while (exception.retry);
8201         return err;
8202 }
8203
8204 /*
8205  * This operation also signals the server that this client is
8206  * performing migration recovery.  The server can stop returning
8207  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8208  * appended to this compound to identify the client ID which is
8209  * performing recovery.
8210  */
8211 static int _nfs40_proc_get_locations(struct nfs_server *server,
8212                                      struct nfs_fh *fhandle,
8213                                      struct nfs4_fs_locations *locations,
8214                                      struct page *page, const struct cred *cred)
8215 {
8216         struct rpc_clnt *clnt = server->client;
8217         u32 bitmask[2] = {
8218                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8219         };
8220         struct nfs4_fs_locations_arg args = {
8221                 .clientid       = server->nfs_client->cl_clientid,
8222                 .fh             = fhandle,
8223                 .page           = page,
8224                 .bitmask        = bitmask,
8225                 .migration      = 1,            /* skip LOOKUP */
8226                 .renew          = 1,            /* append RENEW */
8227         };
8228         struct nfs4_fs_locations_res res = {
8229                 .fs_locations   = locations,
8230                 .migration      = 1,
8231                 .renew          = 1,
8232         };
8233         struct rpc_message msg = {
8234                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8235                 .rpc_argp       = &args,
8236                 .rpc_resp       = &res,
8237                 .rpc_cred       = cred,
8238         };
8239         unsigned long now = jiffies;
8240         int status;
8241
8242         nfs_fattr_init(locations->fattr);
8243         locations->server = server;
8244         locations->nlocations = 0;
8245
8246         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8247         status = nfs4_call_sync_sequence(clnt, server, &msg,
8248                                         &args.seq_args, &res.seq_res);
8249         if (status)
8250                 return status;
8251
8252         renew_lease(server, now);
8253         return 0;
8254 }
8255
8256 #ifdef CONFIG_NFS_V4_1
8257
8258 /*
8259  * This operation also signals the server that this client is
8260  * performing migration recovery.  The server can stop asserting
8261  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8262  * performing this operation is identified in the SEQUENCE
8263  * operation in this compound.
8264  *
8265  * When the client supports GETATTR(fs_locations_info), it can
8266  * be plumbed in here.
8267  */
8268 static int _nfs41_proc_get_locations(struct nfs_server *server,
8269                                      struct nfs_fh *fhandle,
8270                                      struct nfs4_fs_locations *locations,
8271                                      struct page *page, const struct cred *cred)
8272 {
8273         struct rpc_clnt *clnt = server->client;
8274         u32 bitmask[2] = {
8275                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8276         };
8277         struct nfs4_fs_locations_arg args = {
8278                 .fh             = fhandle,
8279                 .page           = page,
8280                 .bitmask        = bitmask,
8281                 .migration      = 1,            /* skip LOOKUP */
8282         };
8283         struct nfs4_fs_locations_res res = {
8284                 .fs_locations   = locations,
8285                 .migration      = 1,
8286         };
8287         struct rpc_message msg = {
8288                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8289                 .rpc_argp       = &args,
8290                 .rpc_resp       = &res,
8291                 .rpc_cred       = cred,
8292         };
8293         struct nfs4_call_sync_data data = {
8294                 .seq_server = server,
8295                 .seq_args = &args.seq_args,
8296                 .seq_res = &res.seq_res,
8297         };
8298         struct rpc_task_setup task_setup_data = {
8299                 .rpc_client = clnt,
8300                 .rpc_message = &msg,
8301                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8302                 .callback_data = &data,
8303                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8304         };
8305         int status;
8306
8307         nfs_fattr_init(locations->fattr);
8308         locations->server = server;
8309         locations->nlocations = 0;
8310
8311         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8312         status = nfs4_call_sync_custom(&task_setup_data);
8313         if (status == NFS4_OK &&
8314             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8315                 status = -NFS4ERR_LEASE_MOVED;
8316         return status;
8317 }
8318
8319 #endif  /* CONFIG_NFS_V4_1 */
8320
8321 /**
8322  * nfs4_proc_get_locations - discover locations for a migrated FSID
8323  * @server: pointer to nfs_server to process
8324  * @fhandle: pointer to the kernel NFS client file handle
8325  * @locations: result of query
8326  * @page: buffer
8327  * @cred: credential to use for this operation
8328  *
8329  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8330  * operation failed, or a negative errno if a local error occurred.
8331  *
8332  * On success, "locations" is filled in, but if the server has
8333  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8334  * asserted.
8335  *
8336  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8337  * from this client that require migration recovery.
8338  */
8339 int nfs4_proc_get_locations(struct nfs_server *server,
8340                             struct nfs_fh *fhandle,
8341                             struct nfs4_fs_locations *locations,
8342                             struct page *page, const struct cred *cred)
8343 {
8344         struct nfs_client *clp = server->nfs_client;
8345         const struct nfs4_mig_recovery_ops *ops =
8346                                         clp->cl_mvops->mig_recovery_ops;
8347         struct nfs4_exception exception = {
8348                 .interruptible = true,
8349         };
8350         int status;
8351
8352         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8353                 (unsigned long long)server->fsid.major,
8354                 (unsigned long long)server->fsid.minor,
8355                 clp->cl_hostname);
8356         nfs_display_fhandle(fhandle, __func__);
8357
8358         do {
8359                 status = ops->get_locations(server, fhandle, locations, page,
8360                                             cred);
8361                 if (status != -NFS4ERR_DELAY)
8362                         break;
8363                 nfs4_handle_exception(server, status, &exception);
8364         } while (exception.retry);
8365         return status;
8366 }
8367
8368 /*
8369  * This operation also signals the server that this client is
8370  * performing "lease moved" recovery.  The server can stop
8371  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8372  * is appended to this compound to identify the client ID which is
8373  * performing recovery.
8374  */
8375 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8376 {
8377         struct nfs_server *server = NFS_SERVER(inode);
8378         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8379         struct rpc_clnt *clnt = server->client;
8380         struct nfs4_fsid_present_arg args = {
8381                 .fh             = NFS_FH(inode),
8382                 .clientid       = clp->cl_clientid,
8383                 .renew          = 1,            /* append RENEW */
8384         };
8385         struct nfs4_fsid_present_res res = {
8386                 .renew          = 1,
8387         };
8388         struct rpc_message msg = {
8389                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8390                 .rpc_argp       = &args,
8391                 .rpc_resp       = &res,
8392                 .rpc_cred       = cred,
8393         };
8394         unsigned long now = jiffies;
8395         int status;
8396
8397         res.fh = nfs_alloc_fhandle();
8398         if (res.fh == NULL)
8399                 return -ENOMEM;
8400
8401         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8402         status = nfs4_call_sync_sequence(clnt, server, &msg,
8403                                                 &args.seq_args, &res.seq_res);
8404         nfs_free_fhandle(res.fh);
8405         if (status)
8406                 return status;
8407
8408         do_renew_lease(clp, now);
8409         return 0;
8410 }
8411
8412 #ifdef CONFIG_NFS_V4_1
8413
8414 /*
8415  * This operation also signals the server that this client is
8416  * performing "lease moved" recovery.  The server can stop asserting
8417  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8418  * this operation is identified in the SEQUENCE operation in this
8419  * compound.
8420  */
8421 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8422 {
8423         struct nfs_server *server = NFS_SERVER(inode);
8424         struct rpc_clnt *clnt = server->client;
8425         struct nfs4_fsid_present_arg args = {
8426                 .fh             = NFS_FH(inode),
8427         };
8428         struct nfs4_fsid_present_res res = {
8429         };
8430         struct rpc_message msg = {
8431                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8432                 .rpc_argp       = &args,
8433                 .rpc_resp       = &res,
8434                 .rpc_cred       = cred,
8435         };
8436         int status;
8437
8438         res.fh = nfs_alloc_fhandle();
8439         if (res.fh == NULL)
8440                 return -ENOMEM;
8441
8442         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8443         status = nfs4_call_sync_sequence(clnt, server, &msg,
8444                                                 &args.seq_args, &res.seq_res);
8445         nfs_free_fhandle(res.fh);
8446         if (status == NFS4_OK &&
8447             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8448                 status = -NFS4ERR_LEASE_MOVED;
8449         return status;
8450 }
8451
8452 #endif  /* CONFIG_NFS_V4_1 */
8453
8454 /**
8455  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8456  * @inode: inode on FSID to check
8457  * @cred: credential to use for this operation
8458  *
8459  * Server indicates whether the FSID is present, moved, or not
8460  * recognized.  This operation is necessary to clear a LEASE_MOVED
8461  * condition for this client ID.
8462  *
8463  * Returns NFS4_OK if the FSID is present on this server,
8464  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8465  *  NFS4ERR code if some error occurred on the server, or a
8466  *  negative errno if a local failure occurred.
8467  */
8468 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8469 {
8470         struct nfs_server *server = NFS_SERVER(inode);
8471         struct nfs_client *clp = server->nfs_client;
8472         const struct nfs4_mig_recovery_ops *ops =
8473                                         clp->cl_mvops->mig_recovery_ops;
8474         struct nfs4_exception exception = {
8475                 .interruptible = true,
8476         };
8477         int status;
8478
8479         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8480                 (unsigned long long)server->fsid.major,
8481                 (unsigned long long)server->fsid.minor,
8482                 clp->cl_hostname);
8483         nfs_display_fhandle(NFS_FH(inode), __func__);
8484
8485         do {
8486                 status = ops->fsid_present(inode, cred);
8487                 if (status != -NFS4ERR_DELAY)
8488                         break;
8489                 nfs4_handle_exception(server, status, &exception);
8490         } while (exception.retry);
8491         return status;
8492 }
8493
8494 /*
8495  * If 'use_integrity' is true and the state managment nfs_client
8496  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8497  * and the machine credential as per RFC3530bis and RFC5661 Security
8498  * Considerations sections. Otherwise, just use the user cred with the
8499  * filesystem's rpc_client.
8500  */
8501 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8502 {
8503         int status;
8504         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8505         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8506         struct nfs4_secinfo_arg args = {
8507                 .dir_fh = NFS_FH(dir),
8508                 .name   = name,
8509         };
8510         struct nfs4_secinfo_res res = {
8511                 .flavors     = flavors,
8512         };
8513         struct rpc_message msg = {
8514                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8515                 .rpc_argp = &args,
8516                 .rpc_resp = &res,
8517         };
8518         struct nfs4_call_sync_data data = {
8519                 .seq_server = NFS_SERVER(dir),
8520                 .seq_args = &args.seq_args,
8521                 .seq_res = &res.seq_res,
8522         };
8523         struct rpc_task_setup task_setup = {
8524                 .rpc_client = clnt,
8525                 .rpc_message = &msg,
8526                 .callback_ops = clp->cl_mvops->call_sync_ops,
8527                 .callback_data = &data,
8528                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8529         };
8530         const struct cred *cred = NULL;
8531
8532         if (use_integrity) {
8533                 clnt = clp->cl_rpcclient;
8534                 task_setup.rpc_client = clnt;
8535
8536                 cred = nfs4_get_clid_cred(clp);
8537                 msg.rpc_cred = cred;
8538         }
8539
8540         dprintk("NFS call  secinfo %s\n", name->name);
8541
8542         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8543         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8544         status = nfs4_call_sync_custom(&task_setup);
8545
8546         dprintk("NFS reply  secinfo: %d\n", status);
8547
8548         put_cred(cred);
8549         return status;
8550 }
8551
8552 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8553                       struct nfs4_secinfo_flavors *flavors)
8554 {
8555         struct nfs4_exception exception = {
8556                 .interruptible = true,
8557         };
8558         int err;
8559         do {
8560                 err = -NFS4ERR_WRONGSEC;
8561
8562                 /* try to use integrity protection with machine cred */
8563                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8564                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8565
8566                 /*
8567                  * if unable to use integrity protection, or SECINFO with
8568                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8569                  * disallowed by spec, but exists in deployed servers) use
8570                  * the current filesystem's rpc_client and the user cred.
8571                  */
8572                 if (err == -NFS4ERR_WRONGSEC)
8573                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8574
8575                 trace_nfs4_secinfo(dir, name, err);
8576                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8577                                 &exception);
8578         } while (exception.retry);
8579         return err;
8580 }
8581
8582 #ifdef CONFIG_NFS_V4_1
8583 /*
8584  * Check the exchange flags returned by the server for invalid flags, having
8585  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8586  * DS flags set.
8587  */
8588 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8589 {
8590         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8591                 goto out_inval;
8592         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8593                 goto out_inval;
8594         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8595             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8596                 goto out_inval;
8597         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8598                 goto out_inval;
8599         return NFS_OK;
8600 out_inval:
8601         return -NFS4ERR_INVAL;
8602 }
8603
8604 static bool
8605 nfs41_same_server_scope(struct nfs41_server_scope *a,
8606                         struct nfs41_server_scope *b)
8607 {
8608         if (a->server_scope_sz != b->server_scope_sz)
8609                 return false;
8610         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8611 }
8612
8613 static void
8614 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8615 {
8616         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8617         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8618         struct nfs_client *clp = args->client;
8619
8620         switch (task->tk_status) {
8621         case -NFS4ERR_BADSESSION:
8622         case -NFS4ERR_DEADSESSION:
8623                 nfs4_schedule_session_recovery(clp->cl_session,
8624                                 task->tk_status);
8625                 return;
8626         }
8627         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8628                         res->dir != NFS4_CDFS4_BOTH) {
8629                 rpc_task_close_connection(task);
8630                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8631                         rpc_restart_call(task);
8632         }
8633 }
8634
8635 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8636         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8637 };
8638
8639 /*
8640  * nfs4_proc_bind_one_conn_to_session()
8641  *
8642  * The 4.1 client currently uses the same TCP connection for the
8643  * fore and backchannel.
8644  */
8645 static
8646 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8647                 struct rpc_xprt *xprt,
8648                 struct nfs_client *clp,
8649                 const struct cred *cred)
8650 {
8651         int status;
8652         struct nfs41_bind_conn_to_session_args args = {
8653                 .client = clp,
8654                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8655                 .retries = 0,
8656         };
8657         struct nfs41_bind_conn_to_session_res res;
8658         struct rpc_message msg = {
8659                 .rpc_proc =
8660                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8661                 .rpc_argp = &args,
8662                 .rpc_resp = &res,
8663                 .rpc_cred = cred,
8664         };
8665         struct rpc_task_setup task_setup_data = {
8666                 .rpc_client = clnt,
8667                 .rpc_xprt = xprt,
8668                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8669                 .rpc_message = &msg,
8670                 .flags = RPC_TASK_TIMEOUT,
8671         };
8672         struct rpc_task *task;
8673
8674         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8675         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8676                 args.dir = NFS4_CDFC4_FORE;
8677
8678         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8679         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8680                 args.dir = NFS4_CDFC4_FORE;
8681
8682         task = rpc_run_task(&task_setup_data);
8683         if (!IS_ERR(task)) {
8684                 status = task->tk_status;
8685                 rpc_put_task(task);
8686         } else
8687                 status = PTR_ERR(task);
8688         trace_nfs4_bind_conn_to_session(clp, status);
8689         if (status == 0) {
8690                 if (memcmp(res.sessionid.data,
8691                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8692                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8693                         return -EIO;
8694                 }
8695                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8696                         dprintk("NFS: %s: Unexpected direction from server\n",
8697                                 __func__);
8698                         return -EIO;
8699                 }
8700                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8701                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8702                                 __func__);
8703                         return -EIO;
8704                 }
8705         }
8706
8707         return status;
8708 }
8709
8710 struct rpc_bind_conn_calldata {
8711         struct nfs_client *clp;
8712         const struct cred *cred;
8713 };
8714
8715 static int
8716 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8717                 struct rpc_xprt *xprt,
8718                 void *calldata)
8719 {
8720         struct rpc_bind_conn_calldata *p = calldata;
8721
8722         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8723 }
8724
8725 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8726 {
8727         struct rpc_bind_conn_calldata data = {
8728                 .clp = clp,
8729                 .cred = cred,
8730         };
8731         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8732                         nfs4_proc_bind_conn_to_session_callback, &data);
8733 }
8734
8735 /*
8736  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8737  * and operations we'd like to see to enable certain features in the allow map
8738  */
8739 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8740         .how = SP4_MACH_CRED,
8741         .enforce.u.words = {
8742                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8743                       1 << (OP_EXCHANGE_ID - 32) |
8744                       1 << (OP_CREATE_SESSION - 32) |
8745                       1 << (OP_DESTROY_SESSION - 32) |
8746                       1 << (OP_DESTROY_CLIENTID - 32)
8747         },
8748         .allow.u.words = {
8749                 [0] = 1 << (OP_CLOSE) |
8750                       1 << (OP_OPEN_DOWNGRADE) |
8751                       1 << (OP_LOCKU) |
8752                       1 << (OP_DELEGRETURN) |
8753                       1 << (OP_COMMIT),
8754                 [1] = 1 << (OP_SECINFO - 32) |
8755                       1 << (OP_SECINFO_NO_NAME - 32) |
8756                       1 << (OP_LAYOUTRETURN - 32) |
8757                       1 << (OP_TEST_STATEID - 32) |
8758                       1 << (OP_FREE_STATEID - 32) |
8759                       1 << (OP_WRITE - 32)
8760         }
8761 };
8762
8763 /*
8764  * Select the state protection mode for client `clp' given the server results
8765  * from exchange_id in `sp'.
8766  *
8767  * Returns 0 on success, negative errno otherwise.
8768  */
8769 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8770                                  struct nfs41_state_protection *sp)
8771 {
8772         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8773                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8774                       1 << (OP_EXCHANGE_ID - 32) |
8775                       1 << (OP_CREATE_SESSION - 32) |
8776                       1 << (OP_DESTROY_SESSION - 32) |
8777                       1 << (OP_DESTROY_CLIENTID - 32)
8778         };
8779         unsigned long flags = 0;
8780         unsigned int i;
8781         int ret = 0;
8782
8783         if (sp->how == SP4_MACH_CRED) {
8784                 /* Print state protect result */
8785                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8786                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8787                         if (test_bit(i, sp->enforce.u.longs))
8788                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8789                         if (test_bit(i, sp->allow.u.longs))
8790                                 dfprintk(MOUNT, "  allow op %d\n", i);
8791                 }
8792
8793                 /* make sure nothing is on enforce list that isn't supported */
8794                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8795                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8796                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8797                                 ret = -EINVAL;
8798                                 goto out;
8799                         }
8800                 }
8801
8802                 /*
8803                  * Minimal mode - state operations are allowed to use machine
8804                  * credential.  Note this already happens by default, so the
8805                  * client doesn't have to do anything more than the negotiation.
8806                  *
8807                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8808                  *       we're already using the machine cred for exchange_id
8809                  *       and will never use a different cred.
8810                  */
8811                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8812                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8813                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8814                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8815                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8816                         dfprintk(MOUNT, "  minimal mode enabled\n");
8817                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8818                 } else {
8819                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8820                         ret = -EINVAL;
8821                         goto out;
8822                 }
8823
8824                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8825                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8826                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8827                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8828                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8829                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8830                 }
8831
8832                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8833                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8834                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8835                 }
8836
8837                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8838                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8839                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8840                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8841                 }
8842
8843                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8844                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8845                         dfprintk(MOUNT, "  stateid mode enabled\n");
8846                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8847                 }
8848
8849                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8850                         dfprintk(MOUNT, "  write mode enabled\n");
8851                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8852                 }
8853
8854                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8855                         dfprintk(MOUNT, "  commit mode enabled\n");
8856                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8857                 }
8858         }
8859 out:
8860         clp->cl_sp4_flags = flags;
8861         return ret;
8862 }
8863
8864 struct nfs41_exchange_id_data {
8865         struct nfs41_exchange_id_res res;
8866         struct nfs41_exchange_id_args args;
8867 };
8868
8869 static void nfs4_exchange_id_release(void *data)
8870 {
8871         struct nfs41_exchange_id_data *cdata =
8872                                         (struct nfs41_exchange_id_data *)data;
8873
8874         nfs_put_client(cdata->args.client);
8875         kfree(cdata->res.impl_id);
8876         kfree(cdata->res.server_scope);
8877         kfree(cdata->res.server_owner);
8878         kfree(cdata);
8879 }
8880
8881 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8882         .rpc_release = nfs4_exchange_id_release,
8883 };
8884
8885 /*
8886  * _nfs4_proc_exchange_id()
8887  *
8888  * Wrapper for EXCHANGE_ID operation.
8889  */
8890 static struct rpc_task *
8891 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8892                         u32 sp4_how, struct rpc_xprt *xprt)
8893 {
8894         struct rpc_message msg = {
8895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8896                 .rpc_cred = cred,
8897         };
8898         struct rpc_task_setup task_setup_data = {
8899                 .rpc_client = clp->cl_rpcclient,
8900                 .callback_ops = &nfs4_exchange_id_call_ops,
8901                 .rpc_message = &msg,
8902                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8903         };
8904         struct nfs41_exchange_id_data *calldata;
8905         int status;
8906
8907         if (!refcount_inc_not_zero(&clp->cl_count))
8908                 return ERR_PTR(-EIO);
8909
8910         status = -ENOMEM;
8911         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8912         if (!calldata)
8913                 goto out;
8914
8915         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8916
8917         status = nfs4_init_uniform_client_string(clp);
8918         if (status)
8919                 goto out_calldata;
8920
8921         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8922                                                 GFP_NOFS);
8923         status = -ENOMEM;
8924         if (unlikely(calldata->res.server_owner == NULL))
8925                 goto out_calldata;
8926
8927         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8928                                         GFP_NOFS);
8929         if (unlikely(calldata->res.server_scope == NULL))
8930                 goto out_server_owner;
8931
8932         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8933         if (unlikely(calldata->res.impl_id == NULL))
8934                 goto out_server_scope;
8935
8936         switch (sp4_how) {
8937         case SP4_NONE:
8938                 calldata->args.state_protect.how = SP4_NONE;
8939                 break;
8940
8941         case SP4_MACH_CRED:
8942                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8943                 break;
8944
8945         default:
8946                 /* unsupported! */
8947                 WARN_ON_ONCE(1);
8948                 status = -EINVAL;
8949                 goto out_impl_id;
8950         }
8951         if (xprt) {
8952                 task_setup_data.rpc_xprt = xprt;
8953                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8954                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8955                                 sizeof(calldata->args.verifier.data));
8956         }
8957         calldata->args.client = clp;
8958         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8959         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8960 #ifdef CONFIG_NFS_V4_1_MIGRATION
8961         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8962 #endif
8963         if (test_bit(NFS_CS_PNFS, &clp->cl_flags))
8964                 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8965         msg.rpc_argp = &calldata->args;
8966         msg.rpc_resp = &calldata->res;
8967         task_setup_data.callback_data = calldata;
8968
8969         return rpc_run_task(&task_setup_data);
8970
8971 out_impl_id:
8972         kfree(calldata->res.impl_id);
8973 out_server_scope:
8974         kfree(calldata->res.server_scope);
8975 out_server_owner:
8976         kfree(calldata->res.server_owner);
8977 out_calldata:
8978         kfree(calldata);
8979 out:
8980         nfs_put_client(clp);
8981         return ERR_PTR(status);
8982 }
8983
8984 /*
8985  * _nfs4_proc_exchange_id()
8986  *
8987  * Wrapper for EXCHANGE_ID operation.
8988  */
8989 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8990                         u32 sp4_how)
8991 {
8992         struct rpc_task *task;
8993         struct nfs41_exchange_id_args *argp;
8994         struct nfs41_exchange_id_res *resp;
8995         unsigned long now = jiffies;
8996         int status;
8997
8998         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8999         if (IS_ERR(task))
9000                 return PTR_ERR(task);
9001
9002         argp = task->tk_msg.rpc_argp;
9003         resp = task->tk_msg.rpc_resp;
9004         status = task->tk_status;
9005         if (status  != 0)
9006                 goto out;
9007
9008         status = nfs4_check_cl_exchange_flags(resp->flags,
9009                         clp->cl_mvops->minor_version);
9010         if (status  != 0)
9011                 goto out;
9012
9013         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
9014         if (status != 0)
9015                 goto out;
9016
9017         do_renew_lease(clp, now);
9018
9019         clp->cl_clientid = resp->clientid;
9020         clp->cl_exchange_flags = resp->flags;
9021         clp->cl_seqid = resp->seqid;
9022         /* Client ID is not confirmed */
9023         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
9024                 clear_bit(NFS4_SESSION_ESTABLISHED,
9025                           &clp->cl_session->session_state);
9026
9027         if (clp->cl_serverscope != NULL &&
9028             !nfs41_same_server_scope(clp->cl_serverscope,
9029                                 resp->server_scope)) {
9030                 dprintk("%s: server_scope mismatch detected\n",
9031                         __func__);
9032                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
9033         }
9034
9035         swap(clp->cl_serverowner, resp->server_owner);
9036         swap(clp->cl_serverscope, resp->server_scope);
9037         swap(clp->cl_implid, resp->impl_id);
9038
9039         /* Save the EXCHANGE_ID verifier session trunk tests */
9040         memcpy(clp->cl_confirm.data, argp->verifier.data,
9041                sizeof(clp->cl_confirm.data));
9042 out:
9043         trace_nfs4_exchange_id(clp, status);
9044         rpc_put_task(task);
9045         return status;
9046 }
9047
9048 /*
9049  * nfs4_proc_exchange_id()
9050  *
9051  * Returns zero, a negative errno, or a negative NFS4ERR status code.
9052  *
9053  * Since the clientid has expired, all compounds using sessions
9054  * associated with the stale clientid will be returning
9055  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
9056  * be in some phase of session reset.
9057  *
9058  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
9059  */
9060 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
9061 {
9062         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
9063         int status;
9064
9065         /* try SP4_MACH_CRED if krb5i/p */
9066         if (authflavor == RPC_AUTH_GSS_KRB5I ||
9067             authflavor == RPC_AUTH_GSS_KRB5P) {
9068                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
9069                 if (!status)
9070                         return 0;
9071         }
9072
9073         /* try SP4_NONE */
9074         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
9075 }
9076
9077 /**
9078  * nfs4_test_session_trunk
9079  *
9080  * This is an add_xprt_test() test function called from
9081  * rpc_clnt_setup_test_and_add_xprt.
9082  *
9083  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
9084  * and is dereferrenced in nfs4_exchange_id_release
9085  *
9086  * Upon success, add the new transport to the rpc_clnt
9087  *
9088  * @clnt: struct rpc_clnt to get new transport
9089  * @xprt: the rpc_xprt to test
9090  * @data: call data for _nfs4_proc_exchange_id.
9091  */
9092 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
9093                             void *data)
9094 {
9095         struct nfs4_add_xprt_data *adata = data;
9096         struct rpc_task *task;
9097         int status;
9098
9099         u32 sp4_how;
9100
9101         dprintk("--> %s try %s\n", __func__,
9102                 xprt->address_strings[RPC_DISPLAY_ADDR]);
9103
9104         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
9105
9106 try_again:
9107         /* Test connection for session trunking. Async exchange_id call */
9108         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
9109         if (IS_ERR(task))
9110                 return;
9111
9112         status = task->tk_status;
9113         if (status == 0) {
9114                 status = nfs4_detect_session_trunking(adata->clp,
9115                                 task->tk_msg.rpc_resp, xprt);
9116                 trace_nfs4_trunked_exchange_id(adata->clp,
9117                         xprt->address_strings[RPC_DISPLAY_ADDR], status);
9118         }
9119         if (status == 0)
9120                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
9121         else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
9122                                 (struct sockaddr *)&xprt->addr))
9123                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
9124
9125         rpc_put_task(task);
9126         if (status == -NFS4ERR_DELAY) {
9127                 ssleep(1);
9128                 goto try_again;
9129         }
9130 }
9131 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
9132
9133 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
9134                 const struct cred *cred)
9135 {
9136         struct rpc_message msg = {
9137                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
9138                 .rpc_argp = clp,
9139                 .rpc_cred = cred,
9140         };
9141         int status;
9142
9143         status = rpc_call_sync(clp->cl_rpcclient, &msg,
9144                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9145         trace_nfs4_destroy_clientid(clp, status);
9146         if (status)
9147                 dprintk("NFS: Got error %d from the server %s on "
9148                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
9149         return status;
9150 }
9151
9152 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9153                 const struct cred *cred)
9154 {
9155         unsigned int loop;
9156         int ret;
9157
9158         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9159                 ret = _nfs4_proc_destroy_clientid(clp, cred);
9160                 switch (ret) {
9161                 case -NFS4ERR_DELAY:
9162                 case -NFS4ERR_CLIENTID_BUSY:
9163                         ssleep(1);
9164                         break;
9165                 default:
9166                         return ret;
9167                 }
9168         }
9169         return 0;
9170 }
9171
9172 int nfs4_destroy_clientid(struct nfs_client *clp)
9173 {
9174         const struct cred *cred;
9175         int ret = 0;
9176
9177         if (clp->cl_mvops->minor_version < 1)
9178                 goto out;
9179         if (clp->cl_exchange_flags == 0)
9180                 goto out;
9181         if (clp->cl_preserve_clid)
9182                 goto out;
9183         cred = nfs4_get_clid_cred(clp);
9184         ret = nfs4_proc_destroy_clientid(clp, cred);
9185         put_cred(cred);
9186         switch (ret) {
9187         case 0:
9188         case -NFS4ERR_STALE_CLIENTID:
9189                 clp->cl_exchange_flags = 0;
9190         }
9191 out:
9192         return ret;
9193 }
9194
9195 #endif /* CONFIG_NFS_V4_1 */
9196
9197 struct nfs4_get_lease_time_data {
9198         struct nfs4_get_lease_time_args *args;
9199         struct nfs4_get_lease_time_res *res;
9200         struct nfs_client *clp;
9201 };
9202
9203 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9204                                         void *calldata)
9205 {
9206         struct nfs4_get_lease_time_data *data =
9207                         (struct nfs4_get_lease_time_data *)calldata;
9208
9209         /* just setup sequence, do not trigger session recovery
9210            since we're invoked within one */
9211         nfs4_setup_sequence(data->clp,
9212                         &data->args->la_seq_args,
9213                         &data->res->lr_seq_res,
9214                         task);
9215 }
9216
9217 /*
9218  * Called from nfs4_state_manager thread for session setup, so don't recover
9219  * from sequence operation or clientid errors.
9220  */
9221 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9222 {
9223         struct nfs4_get_lease_time_data *data =
9224                         (struct nfs4_get_lease_time_data *)calldata;
9225
9226         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9227                 return;
9228         switch (task->tk_status) {
9229         case -NFS4ERR_DELAY:
9230         case -NFS4ERR_GRACE:
9231                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9232                 task->tk_status = 0;
9233                 fallthrough;
9234         case -NFS4ERR_RETRY_UNCACHED_REP:
9235                 rpc_restart_call_prepare(task);
9236                 return;
9237         }
9238 }
9239
9240 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9241         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9242         .rpc_call_done = nfs4_get_lease_time_done,
9243 };
9244
9245 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9246 {
9247         struct nfs4_get_lease_time_args args;
9248         struct nfs4_get_lease_time_res res = {
9249                 .lr_fsinfo = fsinfo,
9250         };
9251         struct nfs4_get_lease_time_data data = {
9252                 .args = &args,
9253                 .res = &res,
9254                 .clp = clp,
9255         };
9256         struct rpc_message msg = {
9257                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9258                 .rpc_argp = &args,
9259                 .rpc_resp = &res,
9260         };
9261         struct rpc_task_setup task_setup = {
9262                 .rpc_client = clp->cl_rpcclient,
9263                 .rpc_message = &msg,
9264                 .callback_ops = &nfs4_get_lease_time_ops,
9265                 .callback_data = &data,
9266                 .flags = RPC_TASK_TIMEOUT,
9267         };
9268
9269         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9270         return nfs4_call_sync_custom(&task_setup);
9271 }
9272
9273 #ifdef CONFIG_NFS_V4_1
9274
9275 /*
9276  * Initialize the values to be used by the client in CREATE_SESSION
9277  * If nfs4_init_session set the fore channel request and response sizes,
9278  * use them.
9279  *
9280  * Set the back channel max_resp_sz_cached to zero to force the client to
9281  * always set csa_cachethis to FALSE because the current implementation
9282  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9283  */
9284 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9285                                     struct rpc_clnt *clnt)
9286 {
9287         unsigned int max_rqst_sz, max_resp_sz;
9288         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9289         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9290
9291         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9292         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9293
9294         /* Fore channel attributes */
9295         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9296         args->fc_attrs.max_resp_sz = max_resp_sz;
9297         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9298         args->fc_attrs.max_reqs = max_session_slots;
9299
9300         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9301                 "max_ops=%u max_reqs=%u\n",
9302                 __func__,
9303                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9304                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9305
9306         /* Back channel attributes */
9307         args->bc_attrs.max_rqst_sz = max_bc_payload;
9308         args->bc_attrs.max_resp_sz = max_bc_payload;
9309         args->bc_attrs.max_resp_sz_cached = 0;
9310         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9311         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9312         if (args->bc_attrs.max_reqs > max_bc_slots)
9313                 args->bc_attrs.max_reqs = max_bc_slots;
9314
9315         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9316                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9317                 __func__,
9318                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9319                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9320                 args->bc_attrs.max_reqs);
9321 }
9322
9323 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9324                 struct nfs41_create_session_res *res)
9325 {
9326         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9327         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9328
9329         if (rcvd->max_resp_sz > sent->max_resp_sz)
9330                 return -EINVAL;
9331         /*
9332          * Our requested max_ops is the minimum we need; we're not
9333          * prepared to break up compounds into smaller pieces than that.
9334          * So, no point even trying to continue if the server won't
9335          * cooperate:
9336          */
9337         if (rcvd->max_ops < sent->max_ops)
9338                 return -EINVAL;
9339         if (rcvd->max_reqs == 0)
9340                 return -EINVAL;
9341         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9342                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9343         return 0;
9344 }
9345
9346 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9347                 struct nfs41_create_session_res *res)
9348 {
9349         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9350         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9351
9352         if (!(res->flags & SESSION4_BACK_CHAN))
9353                 goto out;
9354         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9355                 return -EINVAL;
9356         if (rcvd->max_resp_sz < sent->max_resp_sz)
9357                 return -EINVAL;
9358         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9359                 return -EINVAL;
9360         if (rcvd->max_ops > sent->max_ops)
9361                 return -EINVAL;
9362         if (rcvd->max_reqs > sent->max_reqs)
9363                 return -EINVAL;
9364 out:
9365         return 0;
9366 }
9367
9368 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9369                                      struct nfs41_create_session_res *res)
9370 {
9371         int ret;
9372
9373         ret = nfs4_verify_fore_channel_attrs(args, res);
9374         if (ret)
9375                 return ret;
9376         return nfs4_verify_back_channel_attrs(args, res);
9377 }
9378
9379 static void nfs4_update_session(struct nfs4_session *session,
9380                 struct nfs41_create_session_res *res)
9381 {
9382         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9383         /* Mark client id and session as being confirmed */
9384         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9385         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9386         session->flags = res->flags;
9387         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9388         if (res->flags & SESSION4_BACK_CHAN)
9389                 memcpy(&session->bc_attrs, &res->bc_attrs,
9390                                 sizeof(session->bc_attrs));
9391 }
9392
9393 static int _nfs4_proc_create_session(struct nfs_client *clp,
9394                 const struct cred *cred)
9395 {
9396         struct nfs4_session *session = clp->cl_session;
9397         struct nfs41_create_session_args args = {
9398                 .client = clp,
9399                 .clientid = clp->cl_clientid,
9400                 .seqid = clp->cl_seqid,
9401                 .cb_program = NFS4_CALLBACK,
9402         };
9403         struct nfs41_create_session_res res;
9404
9405         struct rpc_message msg = {
9406                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9407                 .rpc_argp = &args,
9408                 .rpc_resp = &res,
9409                 .rpc_cred = cred,
9410         };
9411         int status;
9412
9413         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9414         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9415
9416         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9417                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9418         trace_nfs4_create_session(clp, status);
9419
9420         switch (status) {
9421         case -NFS4ERR_STALE_CLIENTID:
9422         case -NFS4ERR_DELAY:
9423         case -ETIMEDOUT:
9424         case -EACCES:
9425         case -EAGAIN:
9426                 goto out;
9427         }
9428
9429         clp->cl_seqid++;
9430         if (!status) {
9431                 /* Verify the session's negotiated channel_attrs values */
9432                 status = nfs4_verify_channel_attrs(&args, &res);
9433                 /* Increment the clientid slot sequence id */
9434                 if (status)
9435                         goto out;
9436                 nfs4_update_session(session, &res);
9437         }
9438 out:
9439         return status;
9440 }
9441
9442 /*
9443  * Issues a CREATE_SESSION operation to the server.
9444  * It is the responsibility of the caller to verify the session is
9445  * expired before calling this routine.
9446  */
9447 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9448 {
9449         int status;
9450         unsigned *ptr;
9451         struct nfs4_session *session = clp->cl_session;
9452         struct nfs4_add_xprt_data xprtdata = {
9453                 .clp = clp,
9454         };
9455         struct rpc_add_xprt_test rpcdata = {
9456                 .add_xprt_test = clp->cl_mvops->session_trunk,
9457                 .data = &xprtdata,
9458         };
9459
9460         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9461
9462         status = _nfs4_proc_create_session(clp, cred);
9463         if (status)
9464                 goto out;
9465
9466         /* Init or reset the session slot tables */
9467         status = nfs4_setup_session_slot_tables(session);
9468         dprintk("slot table setup returned %d\n", status);
9469         if (status)
9470                 goto out;
9471
9472         ptr = (unsigned *)&session->sess_id.data[0];
9473         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9474                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9475         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9476 out:
9477         return status;
9478 }
9479
9480 /*
9481  * Issue the over-the-wire RPC DESTROY_SESSION.
9482  * The caller must serialize access to this routine.
9483  */
9484 int nfs4_proc_destroy_session(struct nfs4_session *session,
9485                 const struct cred *cred)
9486 {
9487         struct rpc_message msg = {
9488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9489                 .rpc_argp = session,
9490                 .rpc_cred = cred,
9491         };
9492         int status = 0;
9493
9494         /* session is still being setup */
9495         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9496                 return 0;
9497
9498         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9499                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9500         trace_nfs4_destroy_session(session->clp, status);
9501
9502         if (status)
9503                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9504                         "Session has been destroyed regardless...\n", status);
9505         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9506         return status;
9507 }
9508
9509 /*
9510  * Renew the cl_session lease.
9511  */
9512 struct nfs4_sequence_data {
9513         struct nfs_client *clp;
9514         struct nfs4_sequence_args args;
9515         struct nfs4_sequence_res res;
9516 };
9517
9518 static void nfs41_sequence_release(void *data)
9519 {
9520         struct nfs4_sequence_data *calldata = data;
9521         struct nfs_client *clp = calldata->clp;
9522
9523         if (refcount_read(&clp->cl_count) > 1)
9524                 nfs4_schedule_state_renewal(clp);
9525         nfs_put_client(clp);
9526         kfree(calldata);
9527 }
9528
9529 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9530 {
9531         switch(task->tk_status) {
9532         case -NFS4ERR_DELAY:
9533                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9534                 return -EAGAIN;
9535         default:
9536                 nfs4_schedule_lease_recovery(clp);
9537         }
9538         return 0;
9539 }
9540
9541 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9542 {
9543         struct nfs4_sequence_data *calldata = data;
9544         struct nfs_client *clp = calldata->clp;
9545
9546         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9547                 return;
9548
9549         trace_nfs4_sequence(clp, task->tk_status);
9550         if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9551                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9552                 if (refcount_read(&clp->cl_count) == 1)
9553                         return;
9554
9555                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9556                         rpc_restart_call_prepare(task);
9557                         return;
9558                 }
9559         }
9560         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9561 }
9562
9563 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9564 {
9565         struct nfs4_sequence_data *calldata = data;
9566         struct nfs_client *clp = calldata->clp;
9567         struct nfs4_sequence_args *args;
9568         struct nfs4_sequence_res *res;
9569
9570         args = task->tk_msg.rpc_argp;
9571         res = task->tk_msg.rpc_resp;
9572
9573         nfs4_setup_sequence(clp, args, res, task);
9574 }
9575
9576 static const struct rpc_call_ops nfs41_sequence_ops = {
9577         .rpc_call_done = nfs41_sequence_call_done,
9578         .rpc_call_prepare = nfs41_sequence_prepare,
9579         .rpc_release = nfs41_sequence_release,
9580 };
9581
9582 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9583                 const struct cred *cred,
9584                 struct nfs4_slot *slot,
9585                 bool is_privileged)
9586 {
9587         struct nfs4_sequence_data *calldata;
9588         struct rpc_message msg = {
9589                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9590                 .rpc_cred = cred,
9591         };
9592         struct rpc_task_setup task_setup_data = {
9593                 .rpc_client = clp->cl_rpcclient,
9594                 .rpc_message = &msg,
9595                 .callback_ops = &nfs41_sequence_ops,
9596                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9597         };
9598         struct rpc_task *ret;
9599
9600         ret = ERR_PTR(-EIO);
9601         if (!refcount_inc_not_zero(&clp->cl_count))
9602                 goto out_err;
9603
9604         ret = ERR_PTR(-ENOMEM);
9605         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9606         if (calldata == NULL)
9607                 goto out_put_clp;
9608         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9609         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9610         msg.rpc_argp = &calldata->args;
9611         msg.rpc_resp = &calldata->res;
9612         calldata->clp = clp;
9613         task_setup_data.callback_data = calldata;
9614
9615         ret = rpc_run_task(&task_setup_data);
9616         if (IS_ERR(ret))
9617                 goto out_err;
9618         return ret;
9619 out_put_clp:
9620         nfs_put_client(clp);
9621 out_err:
9622         nfs41_release_slot(slot);
9623         return ret;
9624 }
9625
9626 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9627 {
9628         struct rpc_task *task;
9629         int ret = 0;
9630
9631         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9632                 return -EAGAIN;
9633         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9634         if (IS_ERR(task))
9635                 ret = PTR_ERR(task);
9636         else
9637                 rpc_put_task_async(task);
9638         dprintk("<-- %s status=%d\n", __func__, ret);
9639         return ret;
9640 }
9641
9642 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9643 {
9644         struct rpc_task *task;
9645         int ret;
9646
9647         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9648         if (IS_ERR(task)) {
9649                 ret = PTR_ERR(task);
9650                 goto out;
9651         }
9652         ret = rpc_wait_for_completion_task(task);
9653         if (!ret)
9654                 ret = task->tk_status;
9655         rpc_put_task(task);
9656 out:
9657         dprintk("<-- %s status=%d\n", __func__, ret);
9658         return ret;
9659 }
9660
9661 struct nfs4_reclaim_complete_data {
9662         struct nfs_client *clp;
9663         struct nfs41_reclaim_complete_args arg;
9664         struct nfs41_reclaim_complete_res res;
9665 };
9666
9667 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9668 {
9669         struct nfs4_reclaim_complete_data *calldata = data;
9670
9671         nfs4_setup_sequence(calldata->clp,
9672                         &calldata->arg.seq_args,
9673                         &calldata->res.seq_res,
9674                         task);
9675 }
9676
9677 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9678 {
9679         switch(task->tk_status) {
9680         case 0:
9681                 wake_up_all(&clp->cl_lock_waitq);
9682                 fallthrough;
9683         case -NFS4ERR_COMPLETE_ALREADY:
9684         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9685                 break;
9686         case -NFS4ERR_DELAY:
9687                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9688                 fallthrough;
9689         case -NFS4ERR_RETRY_UNCACHED_REP:
9690         case -EACCES:
9691                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9692                         __func__, task->tk_status, clp->cl_hostname);
9693                 return -EAGAIN;
9694         case -NFS4ERR_BADSESSION:
9695         case -NFS4ERR_DEADSESSION:
9696         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9697                 break;
9698         default:
9699                 nfs4_schedule_lease_recovery(clp);
9700         }
9701         return 0;
9702 }
9703
9704 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9705 {
9706         struct nfs4_reclaim_complete_data *calldata = data;
9707         struct nfs_client *clp = calldata->clp;
9708         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9709
9710         if (!nfs41_sequence_done(task, res))
9711                 return;
9712
9713         trace_nfs4_reclaim_complete(clp, task->tk_status);
9714         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9715                 rpc_restart_call_prepare(task);
9716                 return;
9717         }
9718 }
9719
9720 static void nfs4_free_reclaim_complete_data(void *data)
9721 {
9722         struct nfs4_reclaim_complete_data *calldata = data;
9723
9724         kfree(calldata);
9725 }
9726
9727 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9728         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9729         .rpc_call_done = nfs4_reclaim_complete_done,
9730         .rpc_release = nfs4_free_reclaim_complete_data,
9731 };
9732
9733 /*
9734  * Issue a global reclaim complete.
9735  */
9736 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9737                 const struct cred *cred)
9738 {
9739         struct nfs4_reclaim_complete_data *calldata;
9740         struct rpc_message msg = {
9741                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9742                 .rpc_cred = cred,
9743         };
9744         struct rpc_task_setup task_setup_data = {
9745                 .rpc_client = clp->cl_rpcclient,
9746                 .rpc_message = &msg,
9747                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9748                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9749         };
9750         int status = -ENOMEM;
9751
9752         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9753         if (calldata == NULL)
9754                 goto out;
9755         calldata->clp = clp;
9756         calldata->arg.one_fs = 0;
9757
9758         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9759         msg.rpc_argp = &calldata->arg;
9760         msg.rpc_resp = &calldata->res;
9761         task_setup_data.callback_data = calldata;
9762         status = nfs4_call_sync_custom(&task_setup_data);
9763 out:
9764         dprintk("<-- %s status=%d\n", __func__, status);
9765         return status;
9766 }
9767
9768 static void
9769 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9770 {
9771         struct nfs4_layoutget *lgp = calldata;
9772         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9773
9774         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9775                                 &lgp->res.seq_res, task);
9776 }
9777
9778 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9779 {
9780         struct nfs4_layoutget *lgp = calldata;
9781
9782         nfs41_sequence_process(task, &lgp->res.seq_res);
9783 }
9784
9785 static int
9786 nfs4_layoutget_handle_exception(struct rpc_task *task,
9787                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9788 {
9789         struct inode *inode = lgp->args.inode;
9790         struct nfs_server *server = NFS_SERVER(inode);
9791         struct pnfs_layout_hdr *lo = lgp->lo;
9792         int nfs4err = task->tk_status;
9793         int err, status = 0;
9794         LIST_HEAD(head);
9795
9796         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9797
9798         nfs4_sequence_free_slot(&lgp->res.seq_res);
9799
9800         exception->state = NULL;
9801         exception->stateid = NULL;
9802
9803         switch (nfs4err) {
9804         case 0:
9805                 goto out;
9806
9807         /*
9808          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9809          * on the file. set tk_status to -ENODATA to tell upper layer to
9810          * retry go inband.
9811          */
9812         case -NFS4ERR_LAYOUTUNAVAILABLE:
9813                 status = -ENODATA;
9814                 goto out;
9815         /*
9816          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9817          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9818          */
9819         case -NFS4ERR_BADLAYOUT:
9820                 status = -EOVERFLOW;
9821                 goto out;
9822         /*
9823          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9824          * (or clients) writing to the same RAID stripe except when
9825          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9826          *
9827          * Treat it like we would RECALLCONFLICT -- we retry for a little
9828          * while, and then eventually give up.
9829          */
9830         case -NFS4ERR_LAYOUTTRYLATER:
9831                 if (lgp->args.minlength == 0) {
9832                         status = -EOVERFLOW;
9833                         goto out;
9834                 }
9835                 status = -EBUSY;
9836                 break;
9837         case -NFS4ERR_RECALLCONFLICT:
9838         case -NFS4ERR_RETURNCONFLICT:
9839                 status = -ERECALLCONFLICT;
9840                 break;
9841         case -NFS4ERR_DELEG_REVOKED:
9842         case -NFS4ERR_ADMIN_REVOKED:
9843         case -NFS4ERR_EXPIRED:
9844         case -NFS4ERR_BAD_STATEID:
9845                 exception->timeout = 0;
9846                 spin_lock(&inode->i_lock);
9847                 /* If the open stateid was bad, then recover it. */
9848                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9849                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9850                         spin_unlock(&inode->i_lock);
9851                         exception->state = lgp->args.ctx->state;
9852                         exception->stateid = &lgp->args.stateid;
9853                         break;
9854                 }
9855
9856                 /*
9857                  * Mark the bad layout state as invalid, then retry
9858                  */
9859                 pnfs_mark_layout_stateid_invalid(lo, &head);
9860                 spin_unlock(&inode->i_lock);
9861                 nfs_commit_inode(inode, 0);
9862                 pnfs_free_lseg_list(&head);
9863                 status = -EAGAIN;
9864                 goto out;
9865         }
9866
9867         err = nfs4_handle_exception(server, nfs4err, exception);
9868         if (!status) {
9869                 if (exception->retry)
9870                         status = -EAGAIN;
9871                 else
9872                         status = err;
9873         }
9874 out:
9875         return status;
9876 }
9877
9878 size_t max_response_pages(struct nfs_server *server)
9879 {
9880         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9881         return nfs_page_array_len(0, max_resp_sz);
9882 }
9883
9884 static void nfs4_layoutget_release(void *calldata)
9885 {
9886         struct nfs4_layoutget *lgp = calldata;
9887
9888         nfs4_sequence_free_slot(&lgp->res.seq_res);
9889         pnfs_layoutget_free(lgp);
9890 }
9891
9892 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9893         .rpc_call_prepare = nfs4_layoutget_prepare,
9894         .rpc_call_done = nfs4_layoutget_done,
9895         .rpc_release = nfs4_layoutget_release,
9896 };
9897
9898 struct pnfs_layout_segment *
9899 nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
9900                     struct nfs4_exception *exception)
9901 {
9902         struct inode *inode = lgp->args.inode;
9903         struct nfs_server *server = NFS_SERVER(inode);
9904         struct rpc_task *task;
9905         struct rpc_message msg = {
9906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9907                 .rpc_argp = &lgp->args,
9908                 .rpc_resp = &lgp->res,
9909                 .rpc_cred = lgp->cred,
9910         };
9911         struct rpc_task_setup task_setup_data = {
9912                 .rpc_client = server->client,
9913                 .rpc_message = &msg,
9914                 .callback_ops = &nfs4_layoutget_call_ops,
9915                 .callback_data = lgp,
9916                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9917                          RPC_TASK_MOVEABLE,
9918         };
9919         struct pnfs_layout_segment *lseg = NULL;
9920         int status = 0;
9921
9922         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9923         exception->retry = 0;
9924
9925         task = rpc_run_task(&task_setup_data);
9926         if (IS_ERR(task))
9927                 return ERR_CAST(task);
9928
9929         status = rpc_wait_for_completion_task(task);
9930         if (status != 0)
9931                 goto out;
9932
9933         if (task->tk_status < 0) {
9934                 exception->retry = 1;
9935                 status = nfs4_layoutget_handle_exception(task, lgp, exception);
9936         } else if (lgp->res.layoutp->len == 0) {
9937                 exception->retry = 1;
9938                 status = -EAGAIN;
9939                 nfs4_update_delay(&exception->timeout);
9940         } else
9941                 lseg = pnfs_layout_process(lgp);
9942 out:
9943         trace_nfs4_layoutget(lgp->args.ctx,
9944                         &lgp->args.range,
9945                         &lgp->res.range,
9946                         &lgp->res.stateid,
9947                         status);
9948
9949         rpc_put_task(task);
9950         dprintk("<-- %s status=%d\n", __func__, status);
9951         if (status)
9952                 return ERR_PTR(status);
9953         return lseg;
9954 }
9955
9956 static void
9957 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9958 {
9959         struct nfs4_layoutreturn *lrp = calldata;
9960
9961         nfs4_setup_sequence(lrp->clp,
9962                         &lrp->args.seq_args,
9963                         &lrp->res.seq_res,
9964                         task);
9965         if (!pnfs_layout_is_valid(lrp->args.layout))
9966                 rpc_exit(task, 0);
9967 }
9968
9969 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9970 {
9971         struct nfs4_layoutreturn *lrp = calldata;
9972         struct nfs_server *server;
9973
9974         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9975                 return;
9976
9977         if (task->tk_rpc_status == -ETIMEDOUT) {
9978                 lrp->rpc_status = -EAGAIN;
9979                 lrp->res.lrs_present = 0;
9980                 return;
9981         }
9982         /*
9983          * Was there an RPC level error? Assume the call succeeded,
9984          * and that we need to release the layout
9985          */
9986         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9987                 lrp->res.lrs_present = 0;
9988                 return;
9989         }
9990
9991         server = NFS_SERVER(lrp->args.inode);
9992         switch (task->tk_status) {
9993         case -NFS4ERR_OLD_STATEID:
9994                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9995                                         &lrp->args.range,
9996                                         lrp->args.inode))
9997                         goto out_restart;
9998                 fallthrough;
9999         default:
10000                 task->tk_status = 0;
10001                 fallthrough;
10002         case 0:
10003                 break;
10004         case -NFS4ERR_BADSESSION:
10005         case -NFS4ERR_DEADSESSION:
10006         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10007                 nfs4_schedule_session_recovery(server->nfs_client->cl_session,
10008                                                task->tk_status);
10009                 lrp->res.lrs_present = 0;
10010                 lrp->rpc_status = -EAGAIN;
10011                 task->tk_status = 0;
10012                 break;
10013         case -NFS4ERR_DELAY:
10014                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
10015                         break;
10016                 goto out_restart;
10017         }
10018         return;
10019 out_restart:
10020         task->tk_status = 0;
10021         nfs4_sequence_free_slot(&lrp->res.seq_res);
10022         rpc_restart_call_prepare(task);
10023 }
10024
10025 static void nfs4_layoutreturn_release(void *calldata)
10026 {
10027         struct nfs4_layoutreturn *lrp = calldata;
10028         struct pnfs_layout_hdr *lo = lrp->args.layout;
10029
10030         if (lrp->rpc_status == 0 || !lrp->inode)
10031                 pnfs_layoutreturn_free_lsegs(
10032                         lo, &lrp->args.stateid, &lrp->args.range,
10033                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
10034         else
10035                 pnfs_layoutreturn_retry_later(lo, &lrp->args.stateid,
10036                                               &lrp->args.range);
10037         nfs4_sequence_free_slot(&lrp->res.seq_res);
10038         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
10039                 lrp->ld_private.ops->free(&lrp->ld_private);
10040         pnfs_put_layout_hdr(lrp->args.layout);
10041         nfs_iput_and_deactive(lrp->inode);
10042         put_cred(lrp->cred);
10043         kfree(calldata);
10044 }
10045
10046 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
10047         .rpc_call_prepare = nfs4_layoutreturn_prepare,
10048         .rpc_call_done = nfs4_layoutreturn_done,
10049         .rpc_release = nfs4_layoutreturn_release,
10050 };
10051
10052 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, unsigned int flags)
10053 {
10054         struct rpc_task *task;
10055         struct rpc_message msg = {
10056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
10057                 .rpc_argp = &lrp->args,
10058                 .rpc_resp = &lrp->res,
10059                 .rpc_cred = lrp->cred,
10060         };
10061         struct rpc_task_setup task_setup_data = {
10062                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
10063                 .rpc_message = &msg,
10064                 .callback_ops = &nfs4_layoutreturn_call_ops,
10065                 .callback_data = lrp,
10066                 .flags = RPC_TASK_MOVEABLE,
10067         };
10068         int status = 0;
10069
10070         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
10071                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
10072                         &task_setup_data.rpc_client, &msg);
10073
10074         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
10075         if (flags & PNFS_FL_LAYOUTRETURN_ASYNC) {
10076                 if (!lrp->inode) {
10077                         nfs4_layoutreturn_release(lrp);
10078                         return -EAGAIN;
10079                 }
10080                 task_setup_data.flags |= RPC_TASK_ASYNC;
10081         }
10082         if (!lrp->inode)
10083                 flags |= PNFS_FL_LAYOUTRETURN_PRIVILEGED;
10084         if (flags & PNFS_FL_LAYOUTRETURN_PRIVILEGED)
10085                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
10086                                    1);
10087         else
10088                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
10089                                    0);
10090         task = rpc_run_task(&task_setup_data);
10091         if (IS_ERR(task))
10092                 return PTR_ERR(task);
10093         if (!(flags & PNFS_FL_LAYOUTRETURN_ASYNC))
10094                 status = task->tk_status;
10095         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
10096         dprintk("<-- %s status=%d\n", __func__, status);
10097         rpc_put_task(task);
10098         return status;
10099 }
10100
10101 static int
10102 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
10103                 struct pnfs_device *pdev,
10104                 const struct cred *cred)
10105 {
10106         struct nfs4_getdeviceinfo_args args = {
10107                 .pdev = pdev,
10108                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
10109                         NOTIFY_DEVICEID4_DELETE,
10110         };
10111         struct nfs4_getdeviceinfo_res res = {
10112                 .pdev = pdev,
10113         };
10114         struct rpc_message msg = {
10115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
10116                 .rpc_argp = &args,
10117                 .rpc_resp = &res,
10118                 .rpc_cred = cred,
10119         };
10120         int status;
10121
10122         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
10123         if (res.notification & ~args.notify_types)
10124                 dprintk("%s: unsupported notification\n", __func__);
10125         if (res.notification != args.notify_types)
10126                 pdev->nocache = 1;
10127
10128         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
10129
10130         dprintk("<-- %s status=%d\n", __func__, status);
10131
10132         return status;
10133 }
10134
10135 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
10136                 struct pnfs_device *pdev,
10137                 const struct cred *cred)
10138 {
10139         struct nfs4_exception exception = { };
10140         int err;
10141
10142         do {
10143                 err = nfs4_handle_exception(server,
10144                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
10145                                         &exception);
10146         } while (exception.retry);
10147         return err;
10148 }
10149 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
10150
10151 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
10152 {
10153         struct nfs4_layoutcommit_data *data = calldata;
10154         struct nfs_server *server = NFS_SERVER(data->args.inode);
10155
10156         nfs4_setup_sequence(server->nfs_client,
10157                         &data->args.seq_args,
10158                         &data->res.seq_res,
10159                         task);
10160 }
10161
10162 static void
10163 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
10164 {
10165         struct nfs4_layoutcommit_data *data = calldata;
10166         struct nfs_server *server = NFS_SERVER(data->args.inode);
10167
10168         if (!nfs41_sequence_done(task, &data->res.seq_res))
10169                 return;
10170
10171         switch (task->tk_status) { /* Just ignore these failures */
10172         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
10173         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
10174         case -NFS4ERR_BADLAYOUT:     /* no layout */
10175         case -NFS4ERR_GRACE:        /* loca_recalim always false */
10176                 task->tk_status = 0;
10177                 break;
10178         case 0:
10179                 break;
10180         default:
10181                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10182                         rpc_restart_call_prepare(task);
10183                         return;
10184                 }
10185         }
10186 }
10187
10188 static void nfs4_layoutcommit_release(void *calldata)
10189 {
10190         struct nfs4_layoutcommit_data *data = calldata;
10191
10192         pnfs_cleanup_layoutcommit(data);
10193         nfs_post_op_update_inode_force_wcc(data->args.inode,
10194                                            data->res.fattr);
10195         put_cred(data->cred);
10196         nfs_iput_and_deactive(data->inode);
10197         kfree(data);
10198 }
10199
10200 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10201         .rpc_call_prepare = nfs4_layoutcommit_prepare,
10202         .rpc_call_done = nfs4_layoutcommit_done,
10203         .rpc_release = nfs4_layoutcommit_release,
10204 };
10205
10206 int
10207 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10208 {
10209         struct rpc_message msg = {
10210                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10211                 .rpc_argp = &data->args,
10212                 .rpc_resp = &data->res,
10213                 .rpc_cred = data->cred,
10214         };
10215         struct rpc_task_setup task_setup_data = {
10216                 .task = &data->task,
10217                 .rpc_client = NFS_CLIENT(data->args.inode),
10218                 .rpc_message = &msg,
10219                 .callback_ops = &nfs4_layoutcommit_ops,
10220                 .callback_data = data,
10221                 .flags = RPC_TASK_MOVEABLE,
10222         };
10223         struct rpc_task *task;
10224         int status = 0;
10225
10226         dprintk("NFS: initiating layoutcommit call. sync %d "
10227                 "lbw: %llu inode %lu\n", sync,
10228                 data->args.lastbytewritten,
10229                 data->args.inode->i_ino);
10230
10231         if (!sync) {
10232                 data->inode = nfs_igrab_and_active(data->args.inode);
10233                 if (data->inode == NULL) {
10234                         nfs4_layoutcommit_release(data);
10235                         return -EAGAIN;
10236                 }
10237                 task_setup_data.flags = RPC_TASK_ASYNC;
10238         }
10239         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10240         task = rpc_run_task(&task_setup_data);
10241         if (IS_ERR(task))
10242                 return PTR_ERR(task);
10243         if (sync)
10244                 status = task->tk_status;
10245         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10246         dprintk("%s: status %d\n", __func__, status);
10247         rpc_put_task(task);
10248         return status;
10249 }
10250
10251 /*
10252  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10253  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10254  */
10255 static int
10256 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10257                     struct nfs_fsinfo *info,
10258                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10259 {
10260         struct nfs41_secinfo_no_name_args args = {
10261                 .style = SECINFO_STYLE_CURRENT_FH,
10262         };
10263         struct nfs4_secinfo_res res = {
10264                 .flavors = flavors,
10265         };
10266         struct rpc_message msg = {
10267                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10268                 .rpc_argp = &args,
10269                 .rpc_resp = &res,
10270         };
10271         struct nfs4_call_sync_data data = {
10272                 .seq_server = server,
10273                 .seq_args = &args.seq_args,
10274                 .seq_res = &res.seq_res,
10275         };
10276         struct rpc_task_setup task_setup = {
10277                 .rpc_client = server->client,
10278                 .rpc_message = &msg,
10279                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10280                 .callback_data = &data,
10281                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10282         };
10283         const struct cred *cred = NULL;
10284         int status;
10285
10286         if (use_integrity) {
10287                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10288
10289                 cred = nfs4_get_clid_cred(server->nfs_client);
10290                 msg.rpc_cred = cred;
10291         }
10292
10293         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10294         status = nfs4_call_sync_custom(&task_setup);
10295         dprintk("<-- %s status=%d\n", __func__, status);
10296
10297         put_cred(cred);
10298
10299         return status;
10300 }
10301
10302 static int
10303 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10304                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10305 {
10306         struct nfs4_exception exception = {
10307                 .interruptible = true,
10308         };
10309         int err;
10310         do {
10311                 /* first try using integrity protection */
10312                 err = -NFS4ERR_WRONGSEC;
10313
10314                 /* try to use integrity protection with machine cred */
10315                 if (_nfs4_is_integrity_protected(server->nfs_client))
10316                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10317                                                           flavors, true);
10318
10319                 /*
10320                  * if unable to use integrity protection, or SECINFO with
10321                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10322                  * disallowed by spec, but exists in deployed servers) use
10323                  * the current filesystem's rpc_client and the user cred.
10324                  */
10325                 if (err == -NFS4ERR_WRONGSEC)
10326                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10327                                                           flavors, false);
10328
10329                 switch (err) {
10330                 case 0:
10331                 case -NFS4ERR_WRONGSEC:
10332                 case -ENOTSUPP:
10333                         goto out;
10334                 default:
10335                         err = nfs4_handle_exception(server, err, &exception);
10336                 }
10337         } while (exception.retry);
10338 out:
10339         return err;
10340 }
10341
10342 static int
10343 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10344                     struct nfs_fsinfo *info)
10345 {
10346         int err;
10347         struct page *page;
10348         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10349         struct nfs4_secinfo_flavors *flavors;
10350         struct nfs4_secinfo4 *secinfo;
10351         int i;
10352
10353         page = alloc_page(GFP_KERNEL);
10354         if (!page) {
10355                 err = -ENOMEM;
10356                 goto out;
10357         }
10358
10359         flavors = page_address(page);
10360         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10361
10362         /*
10363          * Fall back on "guess and check" method if
10364          * the server doesn't support SECINFO_NO_NAME
10365          */
10366         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10367                 err = nfs4_find_root_sec(server, fhandle, info);
10368                 goto out_freepage;
10369         }
10370         if (err)
10371                 goto out_freepage;
10372
10373         for (i = 0; i < flavors->num_flavors; i++) {
10374                 secinfo = &flavors->flavors[i];
10375
10376                 switch (secinfo->flavor) {
10377                 case RPC_AUTH_NULL:
10378                 case RPC_AUTH_UNIX:
10379                 case RPC_AUTH_GSS:
10380                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10381                                         &secinfo->flavor_info);
10382                         break;
10383                 default:
10384                         flavor = RPC_AUTH_MAXFLAVOR;
10385                         break;
10386                 }
10387
10388                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10389                         flavor = RPC_AUTH_MAXFLAVOR;
10390
10391                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10392                         err = nfs4_lookup_root_sec(server, fhandle,
10393                                                    info, flavor);
10394                         if (!err)
10395                                 break;
10396                 }
10397         }
10398
10399         if (flavor == RPC_AUTH_MAXFLAVOR)
10400                 err = -EPERM;
10401
10402 out_freepage:
10403         put_page(page);
10404         if (err == -EACCES)
10405                 return -EPERM;
10406 out:
10407         return err;
10408 }
10409
10410 static int _nfs41_test_stateid(struct nfs_server *server,
10411                                const nfs4_stateid *stateid,
10412                                const struct cred *cred)
10413 {
10414         int status;
10415         struct nfs41_test_stateid_args args = {
10416                 .stateid = *stateid,
10417         };
10418         struct nfs41_test_stateid_res res;
10419         struct rpc_message msg = {
10420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10421                 .rpc_argp = &args,
10422                 .rpc_resp = &res,
10423                 .rpc_cred = cred,
10424         };
10425         struct rpc_clnt *rpc_client = server->client;
10426
10427         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10428                 &rpc_client, &msg);
10429
10430         dprintk("NFS call  test_stateid %p\n", stateid);
10431         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10432         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10433                         &args.seq_args, &res.seq_res);
10434         if (status != NFS_OK) {
10435                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10436                 return status;
10437         }
10438         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10439         return -res.status;
10440 }
10441
10442 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10443                 int err, struct nfs4_exception *exception)
10444 {
10445         exception->retry = 0;
10446         switch(err) {
10447         case -NFS4ERR_DELAY:
10448         case -NFS4ERR_RETRY_UNCACHED_REP:
10449                 nfs4_handle_exception(server, err, exception);
10450                 break;
10451         case -NFS4ERR_BADSESSION:
10452         case -NFS4ERR_BADSLOT:
10453         case -NFS4ERR_BAD_HIGH_SLOT:
10454         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10455         case -NFS4ERR_DEADSESSION:
10456                 nfs4_do_handle_exception(server, err, exception);
10457         }
10458 }
10459
10460 /**
10461  * nfs41_test_stateid - perform a TEST_STATEID operation
10462  *
10463  * @server: server / transport on which to perform the operation
10464  * @stateid: state ID to test
10465  * @cred: credential
10466  *
10467  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10468  * Otherwise a negative NFS4ERR value is returned if the operation
10469  * failed or the state ID is not currently valid.
10470  */
10471 static int nfs41_test_stateid(struct nfs_server *server,
10472                               const nfs4_stateid *stateid,
10473                               const struct cred *cred)
10474 {
10475         struct nfs4_exception exception = {
10476                 .interruptible = true,
10477         };
10478         int err;
10479         do {
10480                 err = _nfs41_test_stateid(server, stateid, cred);
10481                 nfs4_handle_delay_or_session_error(server, err, &exception);
10482         } while (exception.retry);
10483         return err;
10484 }
10485
10486 struct nfs_free_stateid_data {
10487         struct nfs_server *server;
10488         struct nfs41_free_stateid_args args;
10489         struct nfs41_free_stateid_res res;
10490 };
10491
10492 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10493 {
10494         struct nfs_free_stateid_data *data = calldata;
10495         nfs4_setup_sequence(data->server->nfs_client,
10496                         &data->args.seq_args,
10497                         &data->res.seq_res,
10498                         task);
10499 }
10500
10501 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10502 {
10503         struct nfs_free_stateid_data *data = calldata;
10504
10505         nfs41_sequence_done(task, &data->res.seq_res);
10506
10507         switch (task->tk_status) {
10508         case -NFS4ERR_DELAY:
10509                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10510                         rpc_restart_call_prepare(task);
10511         }
10512 }
10513
10514 static void nfs41_free_stateid_release(void *calldata)
10515 {
10516         struct nfs_free_stateid_data *data = calldata;
10517         struct nfs_client *clp = data->server->nfs_client;
10518
10519         nfs_put_client(clp);
10520         kfree(calldata);
10521 }
10522
10523 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10524         .rpc_call_prepare = nfs41_free_stateid_prepare,
10525         .rpc_call_done = nfs41_free_stateid_done,
10526         .rpc_release = nfs41_free_stateid_release,
10527 };
10528
10529 /**
10530  * nfs41_free_stateid - perform a FREE_STATEID operation
10531  *
10532  * @server: server / transport on which to perform the operation
10533  * @stateid: state ID to release
10534  * @cred: credential
10535  * @privileged: set to true if this call needs to be privileged
10536  *
10537  * Note: this function is always asynchronous.
10538  */
10539 static int nfs41_free_stateid(struct nfs_server *server,
10540                 const nfs4_stateid *stateid,
10541                 const struct cred *cred,
10542                 bool privileged)
10543 {
10544         struct rpc_message msg = {
10545                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10546                 .rpc_cred = cred,
10547         };
10548         struct rpc_task_setup task_setup = {
10549                 .rpc_client = server->client,
10550                 .rpc_message = &msg,
10551                 .callback_ops = &nfs41_free_stateid_ops,
10552                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10553         };
10554         struct nfs_free_stateid_data *data;
10555         struct rpc_task *task;
10556         struct nfs_client *clp = server->nfs_client;
10557
10558         if (!refcount_inc_not_zero(&clp->cl_count))
10559                 return -EIO;
10560
10561         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10562                 &task_setup.rpc_client, &msg);
10563
10564         dprintk("NFS call  free_stateid %p\n", stateid);
10565         data = kmalloc(sizeof(*data), GFP_KERNEL);
10566         if (!data)
10567                 return -ENOMEM;
10568         data->server = server;
10569         nfs4_stateid_copy(&data->args.stateid, stateid);
10570
10571         task_setup.callback_data = data;
10572
10573         msg.rpc_argp = &data->args;
10574         msg.rpc_resp = &data->res;
10575         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10576         task = rpc_run_task(&task_setup);
10577         if (IS_ERR(task))
10578                 return PTR_ERR(task);
10579         rpc_put_task(task);
10580         return 0;
10581 }
10582
10583 static void
10584 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10585 {
10586         const struct cred *cred = lsp->ls_state->owner->so_cred;
10587
10588         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10589         nfs4_free_lock_state(server, lsp);
10590 }
10591
10592 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10593                 const nfs4_stateid *s2)
10594 {
10595         if (s1->type != s2->type)
10596                 return false;
10597
10598         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10599                 return false;
10600
10601         if (s1->seqid == s2->seqid)
10602                 return true;
10603
10604         return s1->seqid == 0 || s2->seqid == 0;
10605 }
10606
10607 #endif /* CONFIG_NFS_V4_1 */
10608
10609 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10610                 const nfs4_stateid *s2)
10611 {
10612         return nfs4_stateid_match(s1, s2);
10613 }
10614
10615
10616 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10617         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10618         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10619         .recover_open   = nfs4_open_reclaim,
10620         .recover_lock   = nfs4_lock_reclaim,
10621         .establish_clid = nfs4_init_clientid,
10622         .detect_trunking = nfs40_discover_server_trunking,
10623 };
10624
10625 #if defined(CONFIG_NFS_V4_1)
10626 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10627         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10628         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10629         .recover_open   = nfs4_open_reclaim,
10630         .recover_lock   = nfs4_lock_reclaim,
10631         .establish_clid = nfs41_init_clientid,
10632         .reclaim_complete = nfs41_proc_reclaim_complete,
10633         .detect_trunking = nfs41_discover_server_trunking,
10634 };
10635 #endif /* CONFIG_NFS_V4_1 */
10636
10637 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10638         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10639         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10640         .recover_open   = nfs40_open_expired,
10641         .recover_lock   = nfs4_lock_expired,
10642         .establish_clid = nfs4_init_clientid,
10643 };
10644
10645 #if defined(CONFIG_NFS_V4_1)
10646 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10647         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10648         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10649         .recover_open   = nfs41_open_expired,
10650         .recover_lock   = nfs41_lock_expired,
10651         .establish_clid = nfs41_init_clientid,
10652 };
10653 #endif /* CONFIG_NFS_V4_1 */
10654
10655 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10656         .sched_state_renewal = nfs4_proc_async_renew,
10657         .get_state_renewal_cred = nfs4_get_renew_cred,
10658         .renew_lease = nfs4_proc_renew,
10659 };
10660
10661 #if defined(CONFIG_NFS_V4_1)
10662 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10663         .sched_state_renewal = nfs41_proc_async_sequence,
10664         .get_state_renewal_cred = nfs4_get_machine_cred,
10665         .renew_lease = nfs4_proc_sequence,
10666 };
10667 #endif
10668
10669 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10670         .get_locations = _nfs40_proc_get_locations,
10671         .fsid_present = _nfs40_proc_fsid_present,
10672 };
10673
10674 #if defined(CONFIG_NFS_V4_1)
10675 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10676         .get_locations = _nfs41_proc_get_locations,
10677         .fsid_present = _nfs41_proc_fsid_present,
10678 };
10679 #endif  /* CONFIG_NFS_V4_1 */
10680
10681 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10682         .minor_version = 0,
10683         .init_caps = NFS_CAP_READDIRPLUS
10684                 | NFS_CAP_ATOMIC_OPEN
10685                 | NFS_CAP_POSIX_LOCK,
10686         .init_client = nfs40_init_client,
10687         .shutdown_client = nfs40_shutdown_client,
10688         .match_stateid = nfs4_match_stateid,
10689         .find_root_sec = nfs4_find_root_sec,
10690         .free_lock_state = nfs4_release_lockowner,
10691         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10692         .alloc_seqid = nfs_alloc_seqid,
10693         .call_sync_ops = &nfs40_call_sync_ops,
10694         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10695         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10696         .state_renewal_ops = &nfs40_state_renewal_ops,
10697         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10698 };
10699
10700 #if defined(CONFIG_NFS_V4_1)
10701 static struct nfs_seqid *
10702 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10703 {
10704         return NULL;
10705 }
10706
10707 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10708         .minor_version = 1,
10709         .init_caps = NFS_CAP_READDIRPLUS
10710                 | NFS_CAP_ATOMIC_OPEN
10711                 | NFS_CAP_POSIX_LOCK
10712                 | NFS_CAP_STATEID_NFSV41
10713                 | NFS_CAP_ATOMIC_OPEN_V1
10714                 | NFS_CAP_LGOPEN
10715                 | NFS_CAP_MOVEABLE,
10716         .init_client = nfs41_init_client,
10717         .shutdown_client = nfs41_shutdown_client,
10718         .match_stateid = nfs41_match_stateid,
10719         .find_root_sec = nfs41_find_root_sec,
10720         .free_lock_state = nfs41_free_lock_state,
10721         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10722         .alloc_seqid = nfs_alloc_no_seqid,
10723         .session_trunk = nfs4_test_session_trunk,
10724         .call_sync_ops = &nfs41_call_sync_ops,
10725         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10726         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10727         .state_renewal_ops = &nfs41_state_renewal_ops,
10728         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10729 };
10730 #endif
10731
10732 #if defined(CONFIG_NFS_V4_2)
10733 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10734         .minor_version = 2,
10735         .init_caps = NFS_CAP_READDIRPLUS
10736                 | NFS_CAP_ATOMIC_OPEN
10737                 | NFS_CAP_POSIX_LOCK
10738                 | NFS_CAP_STATEID_NFSV41
10739                 | NFS_CAP_ATOMIC_OPEN_V1
10740                 | NFS_CAP_LGOPEN
10741                 | NFS_CAP_ALLOCATE
10742                 | NFS_CAP_COPY
10743                 | NFS_CAP_OFFLOAD_CANCEL
10744                 | NFS_CAP_COPY_NOTIFY
10745                 | NFS_CAP_DEALLOCATE
10746                 | NFS_CAP_SEEK
10747                 | NFS_CAP_LAYOUTSTATS
10748                 | NFS_CAP_CLONE
10749                 | NFS_CAP_LAYOUTERROR
10750                 | NFS_CAP_READ_PLUS
10751                 | NFS_CAP_MOVEABLE,
10752         .init_client = nfs41_init_client,
10753         .shutdown_client = nfs41_shutdown_client,
10754         .match_stateid = nfs41_match_stateid,
10755         .find_root_sec = nfs41_find_root_sec,
10756         .free_lock_state = nfs41_free_lock_state,
10757         .call_sync_ops = &nfs41_call_sync_ops,
10758         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10759         .alloc_seqid = nfs_alloc_no_seqid,
10760         .session_trunk = nfs4_test_session_trunk,
10761         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10762         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10763         .state_renewal_ops = &nfs41_state_renewal_ops,
10764         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10765 };
10766 #endif
10767
10768 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10769         [0] = &nfs_v4_0_minor_ops,
10770 #if defined(CONFIG_NFS_V4_1)
10771         [1] = &nfs_v4_1_minor_ops,
10772 #endif
10773 #if defined(CONFIG_NFS_V4_2)
10774         [2] = &nfs_v4_2_minor_ops,
10775 #endif
10776 };
10777
10778 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10779 {
10780         ssize_t error, error2, error3;
10781         size_t left = size;
10782
10783         error = generic_listxattr(dentry, list, left);
10784         if (error < 0)
10785                 return error;
10786         if (list) {
10787                 list += error;
10788                 left -= error;
10789         }
10790
10791         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left);
10792         if (error2 < 0)
10793                 return error2;
10794
10795         if (list) {
10796                 list += error2;
10797                 left -= error2;
10798         }
10799
10800         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10801         if (error3 < 0)
10802                 return error3;
10803
10804         error += error2 + error3;
10805         if (size && error > size)
10806                 return -ERANGE;
10807         return error;
10808 }
10809
10810 static void nfs4_enable_swap(struct inode *inode)
10811 {
10812         /* The state manager thread must always be running.
10813          * It will notice the client is a swapper, and stay put.
10814          */
10815         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10816
10817         nfs4_schedule_state_manager(clp);
10818 }
10819
10820 static void nfs4_disable_swap(struct inode *inode)
10821 {
10822         /* The state manager thread will now exit once it is
10823          * woken.
10824          */
10825         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10826
10827         set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10828         clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10829         wake_up_var(&clp->cl_state);
10830 }
10831
10832 static const struct inode_operations nfs4_dir_inode_operations = {
10833         .create         = nfs_create,
10834         .lookup         = nfs_lookup,
10835         .atomic_open    = nfs_atomic_open,
10836         .link           = nfs_link,
10837         .unlink         = nfs_unlink,
10838         .symlink        = nfs_symlink,
10839         .mkdir          = nfs_mkdir,
10840         .rmdir          = nfs_rmdir,
10841         .mknod          = nfs_mknod,
10842         .rename         = nfs_rename,
10843         .permission     = nfs_permission,
10844         .getattr        = nfs_getattr,
10845         .setattr        = nfs_setattr,
10846         .listxattr      = nfs4_listxattr,
10847 };
10848
10849 static const struct inode_operations nfs4_file_inode_operations = {
10850         .permission     = nfs_permission,
10851         .getattr        = nfs_getattr,
10852         .setattr        = nfs_setattr,
10853         .listxattr      = nfs4_listxattr,
10854 };
10855
10856 const struct nfs_rpc_ops nfs_v4_clientops = {
10857         .version        = 4,                    /* protocol version */
10858         .dentry_ops     = &nfs4_dentry_operations,
10859         .dir_inode_ops  = &nfs4_dir_inode_operations,
10860         .file_inode_ops = &nfs4_file_inode_operations,
10861         .file_ops       = &nfs4_file_operations,
10862         .getroot        = nfs4_proc_get_root,
10863         .submount       = nfs4_submount,
10864         .try_get_tree   = nfs4_try_get_tree,
10865         .getattr        = nfs4_proc_getattr,
10866         .setattr        = nfs4_proc_setattr,
10867         .lookup         = nfs4_proc_lookup,
10868         .lookupp        = nfs4_proc_lookupp,
10869         .access         = nfs4_proc_access,
10870         .readlink       = nfs4_proc_readlink,
10871         .create         = nfs4_proc_create,
10872         .remove         = nfs4_proc_remove,
10873         .unlink_setup   = nfs4_proc_unlink_setup,
10874         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10875         .unlink_done    = nfs4_proc_unlink_done,
10876         .rename_setup   = nfs4_proc_rename_setup,
10877         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10878         .rename_done    = nfs4_proc_rename_done,
10879         .link           = nfs4_proc_link,
10880         .symlink        = nfs4_proc_symlink,
10881         .mkdir          = nfs4_proc_mkdir,
10882         .rmdir          = nfs4_proc_rmdir,
10883         .readdir        = nfs4_proc_readdir,
10884         .mknod          = nfs4_proc_mknod,
10885         .statfs         = nfs4_proc_statfs,
10886         .fsinfo         = nfs4_proc_fsinfo,
10887         .pathconf       = nfs4_proc_pathconf,
10888         .set_capabilities = nfs4_server_capabilities,
10889         .decode_dirent  = nfs4_decode_dirent,
10890         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10891         .read_setup     = nfs4_proc_read_setup,
10892         .read_done      = nfs4_read_done,
10893         .write_setup    = nfs4_proc_write_setup,
10894         .write_done     = nfs4_write_done,
10895         .commit_setup   = nfs4_proc_commit_setup,
10896         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10897         .commit_done    = nfs4_commit_done,
10898         .lock           = nfs4_proc_lock,
10899         .clear_acl_cache = nfs4_zap_acl_attr,
10900         .close_context  = nfs4_close_context,
10901         .open_context   = nfs4_atomic_open,
10902         .have_delegation = nfs4_have_delegation,
10903         .return_delegation = nfs4_inode_return_delegation,
10904         .alloc_client   = nfs4_alloc_client,
10905         .init_client    = nfs4_init_client,
10906         .free_client    = nfs4_free_client,
10907         .create_server  = nfs4_create_server,
10908         .clone_server   = nfs_clone_server,
10909         .discover_trunking = nfs4_discover_trunking,
10910         .enable_swap    = nfs4_enable_swap,
10911         .disable_swap   = nfs4_disable_swap,
10912 };
10913
10914 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10915         .name   = XATTR_NAME_NFSV4_ACL,
10916         .list   = nfs4_xattr_list_nfs4_acl,
10917         .get    = nfs4_xattr_get_nfs4_acl,
10918         .set    = nfs4_xattr_set_nfs4_acl,
10919 };
10920
10921 #if defined(CONFIG_NFS_V4_1)
10922 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10923         .name   = XATTR_NAME_NFSV4_DACL,
10924         .list   = nfs4_xattr_list_nfs4_dacl,
10925         .get    = nfs4_xattr_get_nfs4_dacl,
10926         .set    = nfs4_xattr_set_nfs4_dacl,
10927 };
10928
10929 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10930         .name   = XATTR_NAME_NFSV4_SACL,
10931         .list   = nfs4_xattr_list_nfs4_sacl,
10932         .get    = nfs4_xattr_get_nfs4_sacl,
10933         .set    = nfs4_xattr_set_nfs4_sacl,
10934 };
10935 #endif
10936
10937 #ifdef CONFIG_NFS_V4_2
10938 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10939         .prefix = XATTR_USER_PREFIX,
10940         .get    = nfs4_xattr_get_nfs4_user,
10941         .set    = nfs4_xattr_set_nfs4_user,
10942 };
10943 #endif
10944
10945 const struct xattr_handler * const nfs4_xattr_handlers[] = {
10946         &nfs4_xattr_nfs4_acl_handler,
10947 #if defined(CONFIG_NFS_V4_1)
10948         &nfs4_xattr_nfs4_dacl_handler,
10949         &nfs4_xattr_nfs4_sacl_handler,
10950 #endif
10951 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10952         &nfs4_xattr_nfs4_label_handler,
10953 #endif
10954 #ifdef CONFIG_NFS_V4_2
10955         &nfs4_xattr_nfs4_user_handler,
10956 #endif
10957         NULL
10958 };