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 *, 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 || !nfs4_have_delegation(inode, FMODE_READ))
 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
 315 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 316                 struct nfs4_readdir_arg *readdir)
 317 {
 318         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 319         __be32 *start, *p;
 320
 321         if (cookie > 2) {
 322                 readdir->cookie = cookie;
 323                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 324                 return;
 325         }
 326
 327         readdir->cookie = 0;
 328         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 329         if (cookie == 2)
 330                 return;
 331
 332         /*
 333          * NFSv4 servers do not return entries for '.' and '..'
 334          * Therefore, we fake these entries here.  We let '.'
 335          * have cookie 0 and '..' have cookie 1.  Note that
 336          * when talking to the server, we always send cookie 0
 337          * instead of 1 or 2.
 338          */
 339         start = p = kmap_atomic(*readdir->pages);
 340
 341         if (cookie == 0) {
 342                 *p++ = xdr_one;                                  /* next */
 343                 *p++ = xdr_zero;                   /* cookie, first word */
 344                 *p++ = xdr_one;                   /* cookie, second word */
 345                 *p++ = xdr_one;                             /* entry len */
 346                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 347                 p++;
 348                 *p++ = xdr_one;                         /* bitmap length */
 349                 *p++ = htonl(attrs);                           /* bitmap */
 350                 *p++ = htonl(12);             /* attribute buffer length */
 351                 *p++ = htonl(NF4DIR);
 352                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 353         }
 354
 355         *p++ = xdr_one;                                  /* next */
 356         *p++ = xdr_zero;                   /* cookie, first word */
 357         *p++ = xdr_two;                   /* cookie, second word */
 358         *p++ = xdr_two;                             /* entry len */
 359         memcpy(p, "..\0\0", 4);                         /* entry */
 360         p++;
 361         *p++ = xdr_one;                         /* bitmap length */
 362         *p++ = htonl(attrs);                           /* bitmap */
 363         *p++ = htonl(12);             /* attribute buffer length */
 364         *p++ = htonl(NF4DIR);
 365         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 366
 367         readdir->pgbase = (char *)p - (char *)start;
 368         readdir->count -= readdir->pgbase;
 369         kunmap_atomic(start);
 370 }
 371
 372 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 373 {
 374         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 375                 fattr->pre_change_attr = version;
 376                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 377         }
 378 }
 379
 380 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 381                 nfs4_stateid *stateid,
 382                 const struct cred *cred)
 383 {
 384         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 385
 386         ops->test_and_free_expired(server, stateid, cred);
 387 }
 388
 389 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 390                 nfs4_stateid *stateid,
 391                 const struct cred *cred)
 392 {
 393         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 394         nfs4_test_and_free_stateid(server, stateid, cred);
 395 }
 396
 397 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 398                 const nfs4_stateid *stateid,
 399                 const struct cred *cred)
 400 {
 401         nfs4_stateid tmp;
 402
 403         nfs4_stateid_copy(&tmp, stateid);
 404         __nfs4_free_revoked_stateid(server, &tmp, cred);
 405 }
 406
 407 static long nfs4_update_delay(long *timeout)
 408 {
 409         long ret;
 410         if (!timeout)
 411                 return NFS4_POLL_RETRY_MAX;
 412         if (*timeout <= 0)
 413                 *timeout = NFS4_POLL_RETRY_MIN;
 414         if (*timeout > NFS4_POLL_RETRY_MAX)
 415                 *timeout = NFS4_POLL_RETRY_MAX;
 416         ret = *timeout;
 417         *timeout <<= 1;
 418         return ret;
 419 }
 420
 421 static int nfs4_delay_killable(long *timeout)
 422 {
 423         might_sleep();
 424
 425         __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
 426         schedule_timeout(nfs4_update_delay(timeout));
 427         if (!__fatal_signal_pending(current))
 428                 return 0;
 429         return -EINTR;
 430 }
 431
 432 static int nfs4_delay_interruptible(long *timeout)
 433 {
 434         might_sleep();
 435
 436         __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
 437         schedule_timeout(nfs4_update_delay(timeout));
 438         if (!signal_pending(current))
 439                 return 0;
 440         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 441 }
 442
 443 static int nfs4_delay(long *timeout, bool interruptible)
 444 {
 445         if (interruptible)
 446                 return nfs4_delay_interruptible(timeout);
 447         return nfs4_delay_killable(timeout);
 448 }
 449
 450 static const nfs4_stateid *
 451 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 452 {
 453         if (!stateid)
 454                 return NULL;
 455         switch (stateid->type) {
 456         case NFS4_OPEN_STATEID_TYPE:
 457         case NFS4_LOCK_STATEID_TYPE:
 458         case NFS4_DELEGATION_STATEID_TYPE:
 459                 return stateid;
 460         default:
 461                 break;
 462         }
 463         return NULL;
 464 }
 465
 466 /* This is the error handling routine for processes that are allowed
 467  * to sleep.
 468  */
 469 static int nfs4_do_handle_exception(struct nfs_server *server,
 470                 int errorcode, struct nfs4_exception *exception)
 471 {
 472         struct nfs_client *clp = server->nfs_client;
 473         struct nfs4_state *state = exception->state;
 474         const nfs4_stateid *stateid;
 475         struct inode *inode = exception->inode;
 476         int ret = errorcode;
 477
 478         exception->delay = 0;
 479         exception->recovering = 0;
 480         exception->retry = 0;
 481
 482         stateid = nfs4_recoverable_stateid(exception->stateid);
 483         if (stateid == NULL && state != NULL)
 484                 stateid = nfs4_recoverable_stateid(&state->stateid);
 485
 486         switch(errorcode) {
 487                 case 0:
 488                         return 0;
 489                 case -NFS4ERR_BADHANDLE:
 490                 case -ESTALE:
 491                         if (inode != NULL && S_ISREG(inode->i_mode))
 492                                 pnfs_destroy_layout(NFS_I(inode));
 493                         break;
 494                 case -NFS4ERR_DELEG_REVOKED:
 495                 case -NFS4ERR_ADMIN_REVOKED:
 496                 case -NFS4ERR_EXPIRED:
 497                 case -NFS4ERR_BAD_STATEID:
 498                 case -NFS4ERR_PARTNER_NO_AUTH:
 499                         if (inode != NULL && stateid != NULL) {
 500                                 nfs_inode_find_state_and_recover(inode,
 501                                                 stateid);
 502                                 goto wait_on_recovery;
 503                         }
 504                         fallthrough;
 505                 case -NFS4ERR_OPENMODE:
 506                         if (inode) {
 507                                 int err;
 508
 509                                 err = nfs_async_inode_return_delegation(inode,
 510                                                 stateid);
 511                                 if (err == 0)
 512                                         goto wait_on_recovery;
 513                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 514                                         exception->retry = 1;
 515                                         break;
 516                                 }
 517                         }
 518                         if (state == NULL)
 519                                 break;
 520                         ret = nfs4_schedule_stateid_recovery(server, state);
 521                         if (ret < 0)
 522                                 break;
 523                         goto wait_on_recovery;
 524                 case -NFS4ERR_STALE_STATEID:
 525                 case -NFS4ERR_STALE_CLIENTID:
 526                         nfs4_schedule_lease_recovery(clp);
 527                         goto wait_on_recovery;
 528                 case -NFS4ERR_MOVED:
 529                         ret = nfs4_schedule_migration_recovery(server);
 530                         if (ret < 0)
 531                                 break;
 532                         goto wait_on_recovery;
 533                 case -NFS4ERR_LEASE_MOVED:
 534                         nfs4_schedule_lease_moved_recovery(clp);
 535                         goto wait_on_recovery;
 536 #if defined(CONFIG_NFS_V4_1)
 537                 case -NFS4ERR_BADSESSION:
 538                 case -NFS4ERR_BADSLOT:
 539                 case -NFS4ERR_BAD_HIGH_SLOT:
 540                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 541                 case -NFS4ERR_DEADSESSION:
 542                 case -NFS4ERR_SEQ_FALSE_RETRY:
 543                 case -NFS4ERR_SEQ_MISORDERED:
 544                         /* Handled in nfs41_sequence_process() */
 545                         goto wait_on_recovery;
 546 #endif /* defined(CONFIG_NFS_V4_1) */
 547                 case -NFS4ERR_FILE_OPEN:
 548                         if (exception->timeout > HZ) {
 549                                 /* We have retried a decent amount, time to
 550                                  * fail
 551                                  */
 552                                 ret = -EBUSY;
 553                                 break;
 554                         }
 555                         fallthrough;
 556                 case -NFS4ERR_DELAY:
 557                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 558                         fallthrough;
 559                 case -NFS4ERR_GRACE:
 560                 case -NFS4ERR_LAYOUTTRYLATER:
 561                 case -NFS4ERR_RECALLCONFLICT:
 562                 case -NFS4ERR_RETURNCONFLICT:
 563                         exception->delay = 1;
 564                         return 0;
 565
 566                 case -NFS4ERR_RETRY_UNCACHED_REP:
 567                 case -NFS4ERR_OLD_STATEID:
 568                         exception->retry = 1;
 569                         break;
 570                 case -NFS4ERR_BADOWNER:
 571                         /* The following works around a Linux server bug! */
 572                 case -NFS4ERR_BADNAME:
 573                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 574                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 575                                 exception->retry = 1;
 576                                 printk(KERN_WARNING "NFS: v4 server %s "
 577                                                 "does not accept raw "
 578                                                 "uid/gids. "
 579                                                 "Reenabling the idmapper.\n",
 580                                                 server->nfs_client->cl_hostname);
 581                         }
 582         }
 583         /* We failed to handle the error */
 584         return nfs4_map_errors(ret);
 585 wait_on_recovery:
 586         exception->recovering = 1;
 587         return 0;
 588 }
 589
 590 /*
 591  * Track the number of NFS4ERR_DELAY related retransmissions and return
 592  * EAGAIN if the 'softerr' mount option is set, and we've exceeded the limit
 593  * set by 'nfs_delay_retrans'.
 594  */
 595 static int nfs4_exception_should_retrans(const struct nfs_server *server,
 596                                          struct nfs4_exception *exception)
 597 {
 598         if (server->flags & NFS_MOUNT_SOFTERR && nfs_delay_retrans >= 0) {
 599                 if (exception->retrans++ >= (unsigned short)nfs_delay_retrans)
 600                         return -EAGAIN;
 601         }
 602         return 0;
 603 }
 604
 605 /* This is the error handling routine for processes that are allowed
 606  * to sleep.
 607  */
 608 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 609 {
 610         struct nfs_client *clp = server->nfs_client;
 611         int ret;
 612
 613         ret = nfs4_do_handle_exception(server, errorcode, exception);
 614         if (exception->delay) {
 615                 int ret2 = nfs4_exception_should_retrans(server, exception);
 616                 if (ret2 < 0) {
 617                         exception->retry = 0;
 618                         return ret2;
 619                 }
 620                 ret = nfs4_delay(&exception->timeout,
 621                                 exception->interruptible);
 622                 goto out_retry;
 623         }
 624         if (exception->recovering) {
 625                 if (exception->task_is_privileged)
 626                         return -EDEADLOCK;
 627                 ret = nfs4_wait_clnt_recover(clp);
 628                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 629                         return -EIO;
 630                 goto out_retry;
 631         }
 632         return ret;
 633 out_retry:
 634         if (ret == 0)
 635                 exception->retry = 1;
 636         return ret;
 637 }
 638
 639 static int
 640 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 641                 int errorcode, struct nfs4_exception *exception)
 642 {
 643         struct nfs_client *clp = server->nfs_client;
 644         int ret;
 645
 646         ret = nfs4_do_handle_exception(server, errorcode, exception);
 647         if (exception->delay) {
 648                 int ret2 = nfs4_exception_should_retrans(server, exception);
 649                 if (ret2 < 0) {
 650                         exception->retry = 0;
 651                         return ret2;
 652                 }
 653                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 654                 goto out_retry;
 655         }
 656         if (exception->recovering) {
 657                 if (exception->task_is_privileged)
 658                         return -EDEADLOCK;
 659                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 660                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 661                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 662                 goto out_retry;
 663         }
 664         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 665                 ret = -EIO;
 666         return ret;
 667 out_retry:
 668         if (ret == 0) {
 669                 exception->retry = 1;
 670                 /*
 671                  * For NFS4ERR_MOVED, the client transport will need to
 672                  * be recomputed after migration recovery has completed.
 673                  */
 674                 if (errorcode == -NFS4ERR_MOVED)
 675                         rpc_task_release_transport(task);
 676         }
 677         return ret;
 678 }
 679
 680 int
 681 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 682                         struct nfs4_state *state, long *timeout)
 683 {
 684         struct nfs4_exception exception = {
 685                 .state = state,
 686         };
 687
 688         if (task->tk_status >= 0)
 689                 return 0;
 690         if (timeout)
 691                 exception.timeout = *timeout;
 692         task->tk_status = nfs4_async_handle_exception(task, server,
 693                         task->tk_status,
 694                         &exception);
 695         if (exception.delay && timeout)
 696                 *timeout = exception.timeout;
 697         if (exception.retry)
 698                 return -EAGAIN;
 699         return 0;
 700 }
 701
 702 /*
 703  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 704  * or 'false' otherwise.
 705  */
 706 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 707 {
 708         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 709         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 710 }
 711
 712 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 713 {
 714         spin_lock(&clp->cl_lock);
 715         if (time_before(clp->cl_last_renewal,timestamp))
 716                 clp->cl_last_renewal = timestamp;
 717         spin_unlock(&clp->cl_lock);
 718 }
 719
 720 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 721 {
 722         struct nfs_client *clp = server->nfs_client;
 723
 724         if (!nfs4_has_session(clp))
 725                 do_renew_lease(clp, timestamp);
 726 }
 727
 728 struct nfs4_call_sync_data {
 729         const struct nfs_server *seq_server;
 730         struct nfs4_sequence_args *seq_args;
 731         struct nfs4_sequence_res *seq_res;
 732 };
 733
 734 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 735                         struct nfs4_sequence_res *res, int cache_reply,
 736                         int privileged)
 737 {
 738         args->sa_slot = NULL;
 739         args->sa_cache_this = cache_reply;
 740         args->sa_privileged = privileged;
 741
 742         res->sr_slot = NULL;
 743 }
 744
 745 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 746 {
 747         struct nfs4_slot *slot = res->sr_slot;
 748         struct nfs4_slot_table *tbl;
 749
 750         tbl = slot->table;
 751         spin_lock(&tbl->slot_tbl_lock);
 752         if (!nfs41_wake_and_assign_slot(tbl, slot))
 753                 nfs4_free_slot(tbl, slot);
 754         spin_unlock(&tbl->slot_tbl_lock);
 755
 756         res->sr_slot = NULL;
 757 }
 758
 759 static int nfs40_sequence_done(struct rpc_task *task,
 760                                struct nfs4_sequence_res *res)
 761 {
 762         if (res->sr_slot != NULL)
 763                 nfs40_sequence_free_slot(res);
 764         return 1;
 765 }
 766
 767 #if defined(CONFIG_NFS_V4_1)
 768
 769 static void nfs41_release_slot(struct nfs4_slot *slot)
 770 {
 771         struct nfs4_session *session;
 772         struct nfs4_slot_table *tbl;
 773         bool send_new_highest_used_slotid = false;
 774
 775         if (!slot)
 776                 return;
 777         tbl = slot->table;
 778         session = tbl->session;
 779
 780         /* Bump the slot sequence number */
 781         if (slot->seq_done)
 782                 slot->seq_nr++;
 783         slot->seq_done = 0;
 784
 785         spin_lock(&tbl->slot_tbl_lock);
 786         /* Be nice to the server: try to ensure that the last transmitted
 787          * value for highest_user_slotid <= target_highest_slotid
 788          */
 789         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 790                 send_new_highest_used_slotid = true;
 791
 792         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 793                 send_new_highest_used_slotid = false;
 794                 goto out_unlock;
 795         }
 796         nfs4_free_slot(tbl, slot);
 797
 798         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 799                 send_new_highest_used_slotid = false;
 800 out_unlock:
 801         spin_unlock(&tbl->slot_tbl_lock);
 802         if (send_new_highest_used_slotid)
 803                 nfs41_notify_server(session->clp);
 804         if (waitqueue_active(&tbl->slot_waitq))
 805                 wake_up_all(&tbl->slot_waitq);
 806 }
 807
 808 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 809 {
 810         nfs41_release_slot(res->sr_slot);
 811         res->sr_slot = NULL;
 812 }
 813
 814 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 815                 u32 seqnr)
 816 {
 817         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 818                 slot->seq_nr_highest_sent = seqnr;
 819 }
 820 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 821 {
 822         nfs4_slot_sequence_record_sent(slot, seqnr);
 823         slot->seq_nr_last_acked = seqnr;
 824 }
 825
 826 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 827                                 struct nfs4_slot *slot)
 828 {
 829         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 830         if (!IS_ERR(task))
 831                 rpc_put_task_async(task);
 832 }
 833
 834 static int nfs41_sequence_process(struct rpc_task *task,
 835                 struct nfs4_sequence_res *res)
 836 {
 837         struct nfs4_session *session;
 838         struct nfs4_slot *slot = res->sr_slot;
 839         struct nfs_client *clp;
 840         int status;
 841         int ret = 1;
 842
 843         if (slot == NULL)
 844                 goto out_noaction;
 845         /* don't increment the sequence number if the task wasn't sent */
 846         if (!RPC_WAS_SENT(task) || slot->seq_done)
 847                 goto out;
 848
 849         session = slot->table->session;
 850         clp = session->clp;
 851
 852         trace_nfs4_sequence_done(session, res);
 853
 854         status = res->sr_status;
 855         if (task->tk_status == -NFS4ERR_DEADSESSION)
 856                 status = -NFS4ERR_DEADSESSION;
 857
 858         /* Check the SEQUENCE operation status */
 859         switch (status) {
 860         case 0:
 861                 /* Mark this sequence number as having been acked */
 862                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 863                 /* Update the slot's sequence and clientid lease timer */
 864                 slot->seq_done = 1;
 865                 do_renew_lease(clp, res->sr_timestamp);
 866                 /* Check sequence flags */
 867                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 868                                 !!slot->privileged);
 869                 nfs41_update_target_slotid(slot->table, slot, res);
 870                 break;
 871         case 1:
 872                 /*
 873                  * sr_status remains 1 if an RPC level error occurred.
 874                  * The server may or may not have processed the sequence
 875                  * operation..
 876                  */
 877                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 878                 slot->seq_done = 1;
 879                 goto out;
 880         case -NFS4ERR_DELAY:
 881                 /* The server detected a resend of the RPC call and
 882                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 883                  * of RFC5661.
 884                  */
 885                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 886                         __func__,
 887                         slot->slot_nr,
 888                         slot->seq_nr);
 889                 goto out_retry;
 890         case -NFS4ERR_RETRY_UNCACHED_REP:
 891         case -NFS4ERR_SEQ_FALSE_RETRY:
 892                 /*
 893                  * The server thinks we tried to replay a request.
 894                  * Retry the call after bumping the sequence ID.
 895                  */
 896                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 897                 goto retry_new_seq;
 898         case -NFS4ERR_BADSLOT:
 899                 /*
 900                  * The slot id we used was probably retired. Try again
 901                  * using a different slot id.
 902                  */
 903                 if (slot->slot_nr < slot->table->target_highest_slotid)
 904                         goto session_recover;
 905                 goto retry_nowait;
 906         case -NFS4ERR_SEQ_MISORDERED:
 907                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 908                 /*
 909                  * Were one or more calls using this slot interrupted?
 910                  * If the server never received the request, then our
 911                  * transmitted slot sequence number may be too high. However,
 912                  * if the server did receive the request then it might
 913                  * accidentally give us a reply with a mismatched operation.
 914                  * We can sort this out by sending a lone sequence operation
 915                  * to the server on the same slot.
 916                  */
 917                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 918                         slot->seq_nr--;
 919                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 920                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 921                                 res->sr_slot = NULL;
 922                         }
 923                         goto retry_nowait;
 924                 }
 925                 /*
 926                  * RFC5661:
 927                  * A retry might be sent while the original request is
 928                  * still in progress on the replier. The replier SHOULD
 929                  * deal with the issue by returning NFS4ERR_DELAY as the
 930                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 931                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 932                  *
 933                  * Restart the search after a delay.
 934                  */
 935                 slot->seq_nr = slot->seq_nr_highest_sent;
 936                 goto out_retry;
 937         case -NFS4ERR_BADSESSION:
 938         case -NFS4ERR_DEADSESSION:
 939         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 940                 goto session_recover;
 941         default:
 942                 /* Just update the slot sequence no. */
 943                 slot->seq_done = 1;
 944         }
 945 out:
 946         /* The session may be reset by one of the error handlers. */
 947         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 948 out_noaction:
 949         return ret;
 950 session_recover:
 951         set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
 952         nfs4_schedule_session_recovery(session, status);
 953         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 954         nfs41_sequence_free_slot(res);
 955         goto out;
 956 retry_new_seq:
 957         ++slot->seq_nr;
 958 retry_nowait:
 959         if (rpc_restart_call_prepare(task)) {
 960                 nfs41_sequence_free_slot(res);
 961                 task->tk_status = 0;
 962                 ret = 0;
 963         }
 964         goto out;
 965 out_retry:
 966         if (!rpc_restart_call(task))
 967                 goto out;
 968         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 969         return 0;
 970 }
 971
 972 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 973 {
 974         if (!nfs41_sequence_process(task, res))
 975                 return 0;
 976         if (res->sr_slot != NULL)
 977                 nfs41_sequence_free_slot(res);
 978         return 1;
 979
 980 }
 981 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 982
 983 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 984 {
 985         if (res->sr_slot == NULL)
 986                 return 1;
 987         if (res->sr_slot->table->session != NULL)
 988                 return nfs41_sequence_process(task, res);
 989         return nfs40_sequence_done(task, res);
 990 }
 991
 992 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 993 {
 994         if (res->sr_slot != NULL) {
 995                 if (res->sr_slot->table->session != NULL)
 996                         nfs41_sequence_free_slot(res);
 997                 else
 998                         nfs40_sequence_free_slot(res);
 999         }
1000 }
1001
1002 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
1003 {
1004         if (res->sr_slot == NULL)
1005                 return 1;
1006         if (!res->sr_slot->table->session)
1007                 return nfs40_sequence_done(task, res);
1008         return nfs41_sequence_done(task, res);
1009 }
1010 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1011
1012 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
1013 {
1014         struct nfs4_call_sync_data *data = calldata;
1015
1016         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
1017
1018         nfs4_setup_sequence(data->seq_server->nfs_client,
1019                             data->seq_args, data->seq_res, task);
1020 }
1021
1022 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
1023 {
1024         struct nfs4_call_sync_data *data = calldata;
1025
1026         nfs41_sequence_done(task, data->seq_res);
1027 }
1028
1029 static const struct rpc_call_ops nfs41_call_sync_ops = {
1030         .rpc_call_prepare = nfs41_call_sync_prepare,
1031         .rpc_call_done = nfs41_call_sync_done,
1032 };
1033
1034 #else   /* !CONFIG_NFS_V4_1 */
1035
1036 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1037 {
1038         return nfs40_sequence_done(task, res);
1039 }
1040
1041 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1042 {
1043         if (res->sr_slot != NULL)
1044                 nfs40_sequence_free_slot(res);
1045 }
1046
1047 int nfs4_sequence_done(struct rpc_task *task,
1048                        struct nfs4_sequence_res *res)
1049 {
1050         return nfs40_sequence_done(task, res);
1051 }
1052 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1053
1054 #endif  /* !CONFIG_NFS_V4_1 */
1055
1056 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1057 {
1058         res->sr_timestamp = jiffies;
1059         res->sr_status_flags = 0;
1060         res->sr_status = 1;
1061 }
1062
1063 static
1064 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1065                 struct nfs4_sequence_res *res,
1066                 struct nfs4_slot *slot)
1067 {
1068         if (!slot)
1069                 return;
1070         slot->privileged = args->sa_privileged ? 1 : 0;
1071         args->sa_slot = slot;
1072
1073         res->sr_slot = slot;
1074 }
1075
1076 int nfs4_setup_sequence(struct nfs_client *client,
1077                         struct nfs4_sequence_args *args,
1078                         struct nfs4_sequence_res *res,
1079                         struct rpc_task *task)
1080 {
1081         struct nfs4_session *session = nfs4_get_session(client);
1082         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1083         struct nfs4_slot *slot;
1084
1085         /* slot already allocated? */
1086         if (res->sr_slot != NULL)
1087                 goto out_start;
1088
1089         if (session)
1090                 tbl = &session->fc_slot_table;
1091
1092         spin_lock(&tbl->slot_tbl_lock);
1093         /* The state manager will wait until the slot table is empty */
1094         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1095                 goto out_sleep;
1096
1097         slot = nfs4_alloc_slot(tbl);
1098         if (IS_ERR(slot)) {
1099                 if (slot == ERR_PTR(-ENOMEM))
1100                         goto out_sleep_timeout;
1101                 goto out_sleep;
1102         }
1103         spin_unlock(&tbl->slot_tbl_lock);
1104
1105         nfs4_sequence_attach_slot(args, res, slot);
1106
1107         trace_nfs4_setup_sequence(session, args);
1108 out_start:
1109         nfs41_sequence_res_init(res);
1110         rpc_call_start(task);
1111         return 0;
1112 out_sleep_timeout:
1113         /* Try again in 1/4 second */
1114         if (args->sa_privileged)
1115                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1116                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1117         else
1118                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1119                                 NULL, jiffies + (HZ >> 2));
1120         spin_unlock(&tbl->slot_tbl_lock);
1121         return -EAGAIN;
1122 out_sleep:
1123         if (args->sa_privileged)
1124                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1125                                 RPC_PRIORITY_PRIVILEGED);
1126         else
1127                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1128         spin_unlock(&tbl->slot_tbl_lock);
1129         return -EAGAIN;
1130 }
1131 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1132
1133 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1134 {
1135         struct nfs4_call_sync_data *data = calldata;
1136         nfs4_setup_sequence(data->seq_server->nfs_client,
1137                                 data->seq_args, data->seq_res, task);
1138 }
1139
1140 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1141 {
1142         struct nfs4_call_sync_data *data = calldata;
1143         nfs4_sequence_done(task, data->seq_res);
1144 }
1145
1146 static const struct rpc_call_ops nfs40_call_sync_ops = {
1147         .rpc_call_prepare = nfs40_call_sync_prepare,
1148         .rpc_call_done = nfs40_call_sync_done,
1149 };
1150
1151 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1152 {
1153         int ret;
1154         struct rpc_task *task;
1155
1156         task = rpc_run_task(task_setup);
1157         if (IS_ERR(task))
1158                 return PTR_ERR(task);
1159
1160         ret = task->tk_status;
1161         rpc_put_task(task);
1162         return ret;
1163 }
1164
1165 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1166                              struct nfs_server *server,
1167                              struct rpc_message *msg,
1168                              struct nfs4_sequence_args *args,
1169                              struct nfs4_sequence_res *res,
1170                              unsigned short task_flags)
1171 {
1172         struct nfs_client *clp = server->nfs_client;
1173         struct nfs4_call_sync_data data = {
1174                 .seq_server = server,
1175                 .seq_args = args,
1176                 .seq_res = res,
1177         };
1178         struct rpc_task_setup task_setup = {
1179                 .rpc_client = clnt,
1180                 .rpc_message = msg,
1181                 .callback_ops = clp->cl_mvops->call_sync_ops,
1182                 .callback_data = &data,
1183                 .flags = task_flags,
1184         };
1185
1186         return nfs4_call_sync_custom(&task_setup);
1187 }
1188
1189 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1190                                    struct nfs_server *server,
1191                                    struct rpc_message *msg,
1192                                    struct nfs4_sequence_args *args,
1193                                    struct nfs4_sequence_res *res)
1194 {
1195         unsigned short task_flags = 0;
1196
1197         if (server->caps & NFS_CAP_MOVEABLE)
1198                 task_flags = RPC_TASK_MOVEABLE;
1199         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1200 }
1201
1202
1203 int nfs4_call_sync(struct rpc_clnt *clnt,
1204                    struct nfs_server *server,
1205                    struct rpc_message *msg,
1206                    struct nfs4_sequence_args *args,
1207                    struct nfs4_sequence_res *res,
1208                    int cache_reply)
1209 {
1210         nfs4_init_sequence(args, res, cache_reply, 0);
1211         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1212 }
1213
1214 static void
1215 nfs4_inc_nlink_locked(struct inode *inode)
1216 {
1217         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1218                                              NFS_INO_INVALID_CTIME |
1219                                              NFS_INO_INVALID_NLINK);
1220         inc_nlink(inode);
1221 }
1222
1223 static void
1224 nfs4_inc_nlink(struct inode *inode)
1225 {
1226         spin_lock(&inode->i_lock);
1227         nfs4_inc_nlink_locked(inode);
1228         spin_unlock(&inode->i_lock);
1229 }
1230
1231 static void
1232 nfs4_dec_nlink_locked(struct inode *inode)
1233 {
1234         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1235                                              NFS_INO_INVALID_CTIME |
1236                                              NFS_INO_INVALID_NLINK);
1237         drop_nlink(inode);
1238 }
1239
1240 static void
1241 nfs4_update_changeattr_locked(struct inode *inode,
1242                 struct nfs4_change_info *cinfo,
1243                 unsigned long timestamp, unsigned long cache_validity)
1244 {
1245         struct nfs_inode *nfsi = NFS_I(inode);
1246         u64 change_attr = inode_peek_iversion_raw(inode);
1247
1248         cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1249         if (S_ISDIR(inode->i_mode))
1250                 cache_validity |= NFS_INO_INVALID_DATA;
1251
1252         switch (NFS_SERVER(inode)->change_attr_type) {
1253         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1254                 if (cinfo->after == change_attr)
1255                         goto out;
1256                 break;
1257         default:
1258                 if ((s64)(change_attr - cinfo->after) >= 0)
1259                         goto out;
1260         }
1261
1262         inode_set_iversion_raw(inode, cinfo->after);
1263         if (!cinfo->atomic || cinfo->before != change_attr) {
1264                 if (S_ISDIR(inode->i_mode))
1265                         nfs_force_lookup_revalidate(inode);
1266
1267                 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1268                         cache_validity |=
1269                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1270                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1271                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1272                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1273                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1274         }
1275         nfsi->attrtimeo_timestamp = jiffies;
1276         nfsi->read_cache_jiffies = timestamp;
1277         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1278         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1279 out:
1280         nfs_set_cache_invalid(inode, cache_validity);
1281 }
1282
1283 void
1284 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1285                 unsigned long timestamp, unsigned long cache_validity)
1286 {
1287         spin_lock(&dir->i_lock);
1288         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1289         spin_unlock(&dir->i_lock);
1290 }
1291
1292 struct nfs4_open_createattrs {
1293         struct nfs4_label *label;
1294         struct iattr *sattr;
1295         const __u32 verf[2];
1296 };
1297
1298 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1299                 int err, struct nfs4_exception *exception)
1300 {
1301         if (err != -EINVAL)
1302                 return false;
1303         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1304                 return false;
1305         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1306         exception->retry = 1;
1307         return true;
1308 }
1309
1310 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1311 {
1312          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1313 }
1314
1315 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1316 {
1317         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1318
1319         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1320 }
1321
1322 static u32
1323 nfs4_map_atomic_open_share(struct nfs_server *server,
1324                 fmode_t fmode, int openflags)
1325 {
1326         u32 res = 0;
1327
1328         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1329         case FMODE_READ:
1330                 res = NFS4_SHARE_ACCESS_READ;
1331                 break;
1332         case FMODE_WRITE:
1333                 res = NFS4_SHARE_ACCESS_WRITE;
1334                 break;
1335         case FMODE_READ|FMODE_WRITE:
1336                 res = NFS4_SHARE_ACCESS_BOTH;
1337         }
1338         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1339                 goto out;
1340         /* Want no delegation if we're using O_DIRECT */
1341         if (openflags & O_DIRECT)
1342                 res |= NFS4_SHARE_WANT_NO_DELEG;
1343 out:
1344         return res;
1345 }
1346
1347 static enum open_claim_type4
1348 nfs4_map_atomic_open_claim(struct nfs_server *server,
1349                 enum open_claim_type4 claim)
1350 {
1351         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1352                 return claim;
1353         switch (claim) {
1354         default:
1355                 return claim;
1356         case NFS4_OPEN_CLAIM_FH:
1357                 return NFS4_OPEN_CLAIM_NULL;
1358         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1359                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1360         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1361                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1362         }
1363 }
1364
1365 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1366 {
1367         p->o_res.f_attr = &p->f_attr;
1368         p->o_res.seqid = p->o_arg.seqid;
1369         p->c_res.seqid = p->c_arg.seqid;
1370         p->o_res.server = p->o_arg.server;
1371         p->o_res.access_request = p->o_arg.access;
1372         nfs_fattr_init(&p->f_attr);
1373         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1374 }
1375
1376 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1377                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1378                 const struct nfs4_open_createattrs *c,
1379                 enum open_claim_type4 claim,
1380                 gfp_t gfp_mask)
1381 {
1382         struct dentry *parent = dget_parent(dentry);
1383         struct inode *dir = d_inode(parent);
1384         struct nfs_server *server = NFS_SERVER(dir);
1385         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1386         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1387         struct nfs4_opendata *p;
1388
1389         p = kzalloc(sizeof(*p), gfp_mask);
1390         if (p == NULL)
1391                 goto err;
1392
1393         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1394         if (IS_ERR(p->f_attr.label))
1395                 goto err_free_p;
1396
1397         p->a_label = nfs4_label_alloc(server, gfp_mask);
1398         if (IS_ERR(p->a_label))
1399                 goto err_free_f;
1400
1401         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1402         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1403         if (IS_ERR(p->o_arg.seqid))
1404                 goto err_free_label;
1405         nfs_sb_active(dentry->d_sb);
1406         p->dentry = dget(dentry);
1407         p->dir = parent;
1408         p->owner = sp;
1409         atomic_inc(&sp->so_count);
1410         p->o_arg.open_flags = flags;
1411         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1412         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1413         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1414                         fmode, flags);
1415         if (flags & O_CREAT) {
1416                 p->o_arg.umask = current_umask();
1417                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1418                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1419                         p->o_arg.u.attrs = &p->attrs;
1420                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1421
1422                         memcpy(p->o_arg.u.verifier.data, c->verf,
1423                                         sizeof(p->o_arg.u.verifier.data));
1424                 }
1425         }
1426         /* ask server to check for all possible rights as results
1427          * are cached */
1428         switch (p->o_arg.claim) {
1429         default:
1430                 break;
1431         case NFS4_OPEN_CLAIM_NULL:
1432         case NFS4_OPEN_CLAIM_FH:
1433                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1434                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1435                                   NFS4_ACCESS_EXECUTE |
1436                                   nfs_access_xattr_mask(server);
1437         }
1438         p->o_arg.clientid = server->nfs_client->cl_clientid;
1439         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1440         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1441         p->o_arg.name = &dentry->d_name;
1442         p->o_arg.server = server;
1443         p->o_arg.bitmask = nfs4_bitmask(server, label);
1444         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1445         switch (p->o_arg.claim) {
1446         case NFS4_OPEN_CLAIM_NULL:
1447         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1448         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1449                 p->o_arg.fh = NFS_FH(dir);
1450                 break;
1451         case NFS4_OPEN_CLAIM_PREVIOUS:
1452         case NFS4_OPEN_CLAIM_FH:
1453         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1454         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1455                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1456         }
1457         p->c_arg.fh = &p->o_res.fh;
1458         p->c_arg.stateid = &p->o_res.stateid;
1459         p->c_arg.seqid = p->o_arg.seqid;
1460         nfs4_init_opendata_res(p);
1461         kref_init(&p->kref);
1462         return p;
1463
1464 err_free_label:
1465         nfs4_label_free(p->a_label);
1466 err_free_f:
1467         nfs4_label_free(p->f_attr.label);
1468 err_free_p:
1469         kfree(p);
1470 err:
1471         dput(parent);
1472         return NULL;
1473 }
1474
1475 static void nfs4_opendata_free(struct kref *kref)
1476 {
1477         struct nfs4_opendata *p = container_of(kref,
1478                         struct nfs4_opendata, kref);
1479         struct super_block *sb = p->dentry->d_sb;
1480
1481         nfs4_lgopen_release(p->lgp);
1482         nfs_free_seqid(p->o_arg.seqid);
1483         nfs4_sequence_free_slot(&p->o_res.seq_res);
1484         if (p->state != NULL)
1485                 nfs4_put_open_state(p->state);
1486         nfs4_put_state_owner(p->owner);
1487
1488         nfs4_label_free(p->a_label);
1489         nfs4_label_free(p->f_attr.label);
1490
1491         dput(p->dir);
1492         dput(p->dentry);
1493         nfs_sb_deactive(sb);
1494         nfs_fattr_free_names(&p->f_attr);
1495         kfree(p->f_attr.mdsthreshold);
1496         kfree(p);
1497 }
1498
1499 static void nfs4_opendata_put(struct nfs4_opendata *p)
1500 {
1501         if (p != NULL)
1502                 kref_put(&p->kref, nfs4_opendata_free);
1503 }
1504
1505 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1506                 fmode_t fmode)
1507 {
1508         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1509         case FMODE_READ|FMODE_WRITE:
1510                 return state->n_rdwr != 0;
1511         case FMODE_WRITE:
1512                 return state->n_wronly != 0;
1513         case FMODE_READ:
1514                 return state->n_rdonly != 0;
1515         }
1516         WARN_ON_ONCE(1);
1517         return false;
1518 }
1519
1520 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1521                 int open_mode, enum open_claim_type4 claim)
1522 {
1523         int ret = 0;
1524
1525         if (open_mode & (O_EXCL|O_TRUNC))
1526                 goto out;
1527         switch (claim) {
1528         case NFS4_OPEN_CLAIM_NULL:
1529         case NFS4_OPEN_CLAIM_FH:
1530                 goto out;
1531         default:
1532                 break;
1533         }
1534         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1535                 case FMODE_READ:
1536                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1537                                 && state->n_rdonly != 0;
1538                         break;
1539                 case FMODE_WRITE:
1540                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1541                                 && state->n_wronly != 0;
1542                         break;
1543                 case FMODE_READ|FMODE_WRITE:
1544                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1545                                 && state->n_rdwr != 0;
1546         }
1547 out:
1548         return ret;
1549 }
1550
1551 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1552                 enum open_claim_type4 claim)
1553 {
1554         if (delegation == NULL)
1555                 return 0;
1556         if ((delegation->type & fmode) != fmode)
1557                 return 0;
1558         switch (claim) {
1559         case NFS4_OPEN_CLAIM_NULL:
1560         case NFS4_OPEN_CLAIM_FH:
1561                 break;
1562         case NFS4_OPEN_CLAIM_PREVIOUS:
1563                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1564                         break;
1565                 fallthrough;
1566         default:
1567                 return 0;
1568         }
1569         nfs_mark_delegation_referenced(delegation);
1570         return 1;
1571 }
1572
1573 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1574 {
1575         switch (fmode) {
1576                 case FMODE_WRITE:
1577                         state->n_wronly++;
1578                         break;
1579                 case FMODE_READ:
1580                         state->n_rdonly++;
1581                         break;
1582                 case FMODE_READ|FMODE_WRITE:
1583                         state->n_rdwr++;
1584         }
1585         nfs4_state_set_mode_locked(state, state->state | fmode);
1586 }
1587
1588 #ifdef CONFIG_NFS_V4_1
1589 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1590 {
1591         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1592                 return true;
1593         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1594                 return true;
1595         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1596                 return true;
1597         return false;
1598 }
1599 #endif /* CONFIG_NFS_V4_1 */
1600
1601 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1602 {
1603         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1604                 wake_up_all(&state->waitq);
1605 }
1606
1607 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1608 {
1609         struct nfs_client *clp = state->owner->so_server->nfs_client;
1610         bool need_recover = false;
1611
1612         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1613                 need_recover = true;
1614         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1615                 need_recover = true;
1616         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1617                 need_recover = true;
1618         if (need_recover)
1619                 nfs4_state_mark_reclaim_nograce(clp, state);
1620 }
1621
1622 /*
1623  * Check for whether or not the caller may update the open stateid
1624  * to the value passed in by stateid.
1625  *
1626  * Note: This function relies heavily on the server implementing
1627  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1628  * correctly.
1629  * i.e. The stateid seqids have to be initialised to 1, and
1630  * are then incremented on every state transition.
1631  */
1632 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1633                 const nfs4_stateid *stateid)
1634 {
1635         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1636                 /* The common case - we're updating to a new sequence number */
1637                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1638                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1639                                 return true;
1640                         return false;
1641                 }
1642                 /* The server returned a new stateid */
1643         }
1644         /* This is the first OPEN in this generation */
1645         if (stateid->seqid == cpu_to_be32(1))
1646                 return true;
1647         return false;
1648 }
1649
1650 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1651 {
1652         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1653                 return;
1654         if (state->n_wronly)
1655                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1656         if (state->n_rdonly)
1657                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1658         if (state->n_rdwr)
1659                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1660         set_bit(NFS_OPEN_STATE, &state->flags);
1661 }
1662
1663 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1664                 nfs4_stateid *stateid, fmode_t fmode)
1665 {
1666         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1667         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1668         case FMODE_WRITE:
1669                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1670                 break;
1671         case FMODE_READ:
1672                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1673                 break;
1674         case 0:
1675                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1676                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1677                 clear_bit(NFS_OPEN_STATE, &state->flags);
1678         }
1679         if (stateid == NULL)
1680                 return;
1681         /* Handle OPEN+OPEN_DOWNGRADE races */
1682         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1683             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1684                 nfs_resync_open_stateid_locked(state);
1685                 goto out;
1686         }
1687         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1688                 nfs4_stateid_copy(&state->stateid, stateid);
1689         nfs4_stateid_copy(&state->open_stateid, stateid);
1690         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1691 out:
1692         nfs_state_log_update_open_stateid(state);
1693 }
1694
1695 static void nfs_clear_open_stateid(struct nfs4_state *state,
1696         nfs4_stateid *arg_stateid,
1697         nfs4_stateid *stateid, fmode_t fmode)
1698 {
1699         write_seqlock(&state->seqlock);
1700         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1701         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1702                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1703         write_sequnlock(&state->seqlock);
1704         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1705                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1706 }
1707
1708 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1709                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1710         __must_hold(&state->owner->so_lock)
1711         __must_hold(&state->seqlock)
1712         __must_hold(RCU)
1713
1714 {
1715         DEFINE_WAIT(wait);
1716         int status = 0;
1717         for (;;) {
1718
1719                 if (nfs_stateid_is_sequential(state, stateid))
1720                         break;
1721
1722                 if (status)
1723                         break;
1724                 /* Rely on seqids for serialisation with NFSv4.0 */
1725                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1726                         break;
1727
1728                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1729                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1730                 /*
1731                  * Ensure we process the state changes in the same order
1732                  * in which the server processed them by delaying the
1733                  * update of the stateid until we are in sequence.
1734                  */
1735                 write_sequnlock(&state->seqlock);
1736                 spin_unlock(&state->owner->so_lock);
1737                 rcu_read_unlock();
1738                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1739
1740                 if (!fatal_signal_pending(current)) {
1741                         if (schedule_timeout(5*HZ) == 0)
1742                                 status = -EAGAIN;
1743                         else
1744                                 status = 0;
1745                 } else
1746                         status = -EINTR;
1747                 finish_wait(&state->waitq, &wait);
1748                 rcu_read_lock();
1749                 spin_lock(&state->owner->so_lock);
1750                 write_seqlock(&state->seqlock);
1751         }
1752
1753         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1754             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1755                 nfs4_stateid_copy(freeme, &state->open_stateid);
1756                 nfs_test_and_clear_all_open_stateid(state);
1757         }
1758
1759         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1760                 nfs4_stateid_copy(&state->stateid, stateid);
1761         nfs4_stateid_copy(&state->open_stateid, stateid);
1762         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1763         nfs_state_log_update_open_stateid(state);
1764 }
1765
1766 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1767                 const nfs4_stateid *open_stateid,
1768                 fmode_t fmode,
1769                 nfs4_stateid *freeme)
1770 {
1771         /*
1772          * Protect the call to nfs4_state_set_mode_locked and
1773          * serialise the stateid update
1774          */
1775         write_seqlock(&state->seqlock);
1776         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1777         switch (fmode) {
1778         case FMODE_READ:
1779                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1780                 break;
1781         case FMODE_WRITE:
1782                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1783                 break;
1784         case FMODE_READ|FMODE_WRITE:
1785                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1786         }
1787         set_bit(NFS_OPEN_STATE, &state->flags);
1788         write_sequnlock(&state->seqlock);
1789 }
1790
1791 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1792 {
1793         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1794         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1795         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1796         clear_bit(NFS_OPEN_STATE, &state->flags);
1797 }
1798
1799 static void nfs_state_set_delegation(struct nfs4_state *state,
1800                 const nfs4_stateid *deleg_stateid,
1801                 fmode_t fmode)
1802 {
1803         /*
1804          * Protect the call to nfs4_state_set_mode_locked and
1805          * serialise the stateid update
1806          */
1807         write_seqlock(&state->seqlock);
1808         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1809         set_bit(NFS_DELEGATED_STATE, &state->flags);
1810         write_sequnlock(&state->seqlock);
1811 }
1812
1813 static void nfs_state_clear_delegation(struct nfs4_state *state)
1814 {
1815         write_seqlock(&state->seqlock);
1816         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1817         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1818         write_sequnlock(&state->seqlock);
1819 }
1820
1821 int update_open_stateid(struct nfs4_state *state,
1822                 const nfs4_stateid *open_stateid,
1823                 const nfs4_stateid *delegation,
1824                 fmode_t fmode)
1825 {
1826         struct nfs_server *server = NFS_SERVER(state->inode);
1827         struct nfs_client *clp = server->nfs_client;
1828         struct nfs_inode *nfsi = NFS_I(state->inode);
1829         struct nfs_delegation *deleg_cur;
1830         nfs4_stateid freeme = { };
1831         int ret = 0;
1832
1833         fmode &= (FMODE_READ|FMODE_WRITE);
1834
1835         rcu_read_lock();
1836         spin_lock(&state->owner->so_lock);
1837         if (open_stateid != NULL) {
1838                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1839                 ret = 1;
1840         }
1841
1842         deleg_cur = nfs4_get_valid_delegation(state->inode);
1843         if (deleg_cur == NULL)
1844                 goto no_delegation;
1845
1846         spin_lock(&deleg_cur->lock);
1847         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1848            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1849             (deleg_cur->type & fmode) != fmode)
1850                 goto no_delegation_unlock;
1851
1852         if (delegation == NULL)
1853                 delegation = &deleg_cur->stateid;
1854         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1855                 goto no_delegation_unlock;
1856
1857         nfs_mark_delegation_referenced(deleg_cur);
1858         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1859         ret = 1;
1860 no_delegation_unlock:
1861         spin_unlock(&deleg_cur->lock);
1862 no_delegation:
1863         if (ret)
1864                 update_open_stateflags(state, fmode);
1865         spin_unlock(&state->owner->so_lock);
1866         rcu_read_unlock();
1867
1868         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1869                 nfs4_schedule_state_manager(clp);
1870         if (freeme.type != 0)
1871                 nfs4_test_and_free_stateid(server, &freeme,
1872                                 state->owner->so_cred);
1873
1874         return ret;
1875 }
1876
1877 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1878                 const nfs4_stateid *stateid)
1879 {
1880         struct nfs4_state *state = lsp->ls_state;
1881         bool ret = false;
1882
1883         spin_lock(&state->state_lock);
1884         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1885                 goto out_noupdate;
1886         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1887                 goto out_noupdate;
1888         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1889         ret = true;
1890 out_noupdate:
1891         spin_unlock(&state->state_lock);
1892         return ret;
1893 }
1894
1895 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1896 {
1897         struct nfs_delegation *delegation;
1898
1899         fmode &= FMODE_READ|FMODE_WRITE;
1900         rcu_read_lock();
1901         delegation = nfs4_get_valid_delegation(inode);
1902         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1903                 rcu_read_unlock();
1904                 return;
1905         }
1906         rcu_read_unlock();
1907         nfs4_inode_return_delegation(inode);
1908 }
1909
1910 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1911 {
1912         struct nfs4_state *state = opendata->state;
1913         struct nfs_delegation *delegation;
1914         int open_mode = opendata->o_arg.open_flags;
1915         fmode_t fmode = opendata->o_arg.fmode;
1916         enum open_claim_type4 claim = opendata->o_arg.claim;
1917         nfs4_stateid stateid;
1918         int ret = -EAGAIN;
1919
1920         for (;;) {
1921                 spin_lock(&state->owner->so_lock);
1922                 if (can_open_cached(state, fmode, open_mode, claim)) {
1923                         update_open_stateflags(state, fmode);
1924                         spin_unlock(&state->owner->so_lock);
1925                         goto out_return_state;
1926                 }
1927                 spin_unlock(&state->owner->so_lock);
1928                 rcu_read_lock();
1929                 delegation = nfs4_get_valid_delegation(state->inode);
1930                 if (!can_open_delegated(delegation, fmode, claim)) {
1931                         rcu_read_unlock();
1932                         break;
1933                 }
1934                 /* Save the delegation */
1935                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1936                 rcu_read_unlock();
1937                 nfs_release_seqid(opendata->o_arg.seqid);
1938                 if (!opendata->is_recover) {
1939                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1940                         if (ret != 0)
1941                                 goto out;
1942                 }
1943                 ret = -EAGAIN;
1944
1945                 /* Try to update the stateid using the delegation */
1946                 if (update_open_stateid(state, NULL, &stateid, fmode))
1947                         goto out_return_state;
1948         }
1949 out:
1950         return ERR_PTR(ret);
1951 out_return_state:
1952         refcount_inc(&state->count);
1953         return state;
1954 }
1955
1956 static void
1957 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1958 {
1959         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1960         struct nfs_delegation *delegation;
1961         int delegation_flags = 0;
1962
1963         rcu_read_lock();
1964         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1965         if (delegation)
1966                 delegation_flags = delegation->flags;
1967         rcu_read_unlock();
1968         switch (data->o_arg.claim) {
1969         default:
1970                 break;
1971         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1972         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1973                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1974                                    "returning a delegation for "
1975                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1976                                    clp->cl_hostname);
1977                 return;
1978         }
1979         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1980                 nfs_inode_set_delegation(state->inode,
1981                                 data->owner->so_cred,
1982                                 data->o_res.delegation_type,
1983                                 &data->o_res.delegation,
1984                                 data->o_res.pagemod_limit);
1985         else
1986                 nfs_inode_reclaim_delegation(state->inode,
1987                                 data->owner->so_cred,
1988                                 data->o_res.delegation_type,
1989                                 &data->o_res.delegation,
1990                                 data->o_res.pagemod_limit);
1991
1992         if (data->o_res.do_recall)
1993                 nfs_async_inode_return_delegation(state->inode,
1994                                                   &data->o_res.delegation);
1995 }
1996
1997 /*
1998  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1999  * and update the nfs4_state.
2000  */
2001 static struct nfs4_state *
2002 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
2003 {
2004         struct inode *inode = data->state->inode;
2005         struct nfs4_state *state = data->state;
2006         int ret;
2007
2008         if (!data->rpc_done) {
2009                 if (data->rpc_status)
2010                         return ERR_PTR(data->rpc_status);
2011                 return nfs4_try_open_cached(data);
2012         }
2013
2014         ret = nfs_refresh_inode(inode, &data->f_attr);
2015         if (ret)
2016                 return ERR_PTR(ret);
2017
2018         if (data->o_res.delegation_type != 0)
2019                 nfs4_opendata_check_deleg(data, state);
2020
2021         if (!update_open_stateid(state, &data->o_res.stateid,
2022                                 NULL, data->o_arg.fmode))
2023                 return ERR_PTR(-EAGAIN);
2024         refcount_inc(&state->count);
2025
2026         return state;
2027 }
2028
2029 static struct inode *
2030 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2031 {
2032         struct inode *inode;
2033
2034         switch (data->o_arg.claim) {
2035         case NFS4_OPEN_CLAIM_NULL:
2036         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2037         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2038                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2039                         return ERR_PTR(-EAGAIN);
2040                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2041                                 &data->f_attr);
2042                 break;
2043         default:
2044                 inode = d_inode(data->dentry);
2045                 ihold(inode);
2046                 nfs_refresh_inode(inode, &data->f_attr);
2047         }
2048         return inode;
2049 }
2050
2051 static struct nfs4_state *
2052 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2053 {
2054         struct nfs4_state *state;
2055         struct inode *inode;
2056
2057         inode = nfs4_opendata_get_inode(data);
2058         if (IS_ERR(inode))
2059                 return ERR_CAST(inode);
2060         if (data->state != NULL && data->state->inode == inode) {
2061                 state = data->state;
2062                 refcount_inc(&state->count);
2063         } else
2064                 state = nfs4_get_open_state(inode, data->owner);
2065         iput(inode);
2066         if (state == NULL)
2067                 state = ERR_PTR(-ENOMEM);
2068         return state;
2069 }
2070
2071 static struct nfs4_state *
2072 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2073 {
2074         struct nfs4_state *state;
2075
2076         if (!data->rpc_done) {
2077                 state = nfs4_try_open_cached(data);
2078                 trace_nfs4_cached_open(data->state);
2079                 goto out;
2080         }
2081
2082         state = nfs4_opendata_find_nfs4_state(data);
2083         if (IS_ERR(state))
2084                 goto out;
2085
2086         if (data->o_res.delegation_type != 0)
2087                 nfs4_opendata_check_deleg(data, state);
2088         if (!update_open_stateid(state, &data->o_res.stateid,
2089                                 NULL, data->o_arg.fmode)) {
2090                 nfs4_put_open_state(state);
2091                 state = ERR_PTR(-EAGAIN);
2092         }
2093 out:
2094         nfs_release_seqid(data->o_arg.seqid);
2095         return state;
2096 }
2097
2098 static struct nfs4_state *
2099 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2100 {
2101         struct nfs4_state *ret;
2102
2103         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2104                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2105         else
2106                 ret = _nfs4_opendata_to_nfs4_state(data);
2107         nfs4_sequence_free_slot(&data->o_res.seq_res);
2108         return ret;
2109 }
2110
2111 static struct nfs_open_context *
2112 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2113 {
2114         struct nfs_inode *nfsi = NFS_I(state->inode);
2115         struct nfs_open_context *ctx;
2116
2117         rcu_read_lock();
2118         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2119                 if (ctx->state != state)
2120                         continue;
2121                 if ((ctx->mode & mode) != mode)
2122                         continue;
2123                 if (!get_nfs_open_context(ctx))
2124                         continue;
2125                 rcu_read_unlock();
2126                 return ctx;
2127         }
2128         rcu_read_unlock();
2129         return ERR_PTR(-ENOENT);
2130 }
2131
2132 static struct nfs_open_context *
2133 nfs4_state_find_open_context(struct nfs4_state *state)
2134 {
2135         struct nfs_open_context *ctx;
2136
2137         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2138         if (!IS_ERR(ctx))
2139                 return ctx;
2140         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2141         if (!IS_ERR(ctx))
2142                 return ctx;
2143         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2144 }
2145
2146 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2147                 struct nfs4_state *state, enum open_claim_type4 claim)
2148 {
2149         struct nfs4_opendata *opendata;
2150
2151         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2152                         NULL, claim, GFP_NOFS);
2153         if (opendata == NULL)
2154                 return ERR_PTR(-ENOMEM);
2155         opendata->state = state;
2156         refcount_inc(&state->count);
2157         return opendata;
2158 }
2159
2160 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2161                                     fmode_t fmode)
2162 {
2163         struct nfs4_state *newstate;
2164         struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2165         int openflags = opendata->o_arg.open_flags;
2166         int ret;
2167
2168         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2169                 return 0;
2170         opendata->o_arg.fmode = fmode;
2171         opendata->o_arg.share_access =
2172                 nfs4_map_atomic_open_share(server, fmode, openflags);
2173         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2174         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2175         nfs4_init_opendata_res(opendata);
2176         ret = _nfs4_recover_proc_open(opendata);
2177         if (ret != 0)
2178                 return ret;
2179         newstate = nfs4_opendata_to_nfs4_state(opendata);
2180         if (IS_ERR(newstate))
2181                 return PTR_ERR(newstate);
2182         if (newstate != opendata->state)
2183                 ret = -ESTALE;
2184         nfs4_close_state(newstate, fmode);
2185         return ret;
2186 }
2187
2188 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2189 {
2190         int ret;
2191
2192         /* memory barrier prior to reading state->n_* */
2193         smp_rmb();
2194         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2195         if (ret != 0)
2196                 return ret;
2197         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2198         if (ret != 0)
2199                 return ret;
2200         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2201         if (ret != 0)
2202                 return ret;
2203         /*
2204          * We may have performed cached opens for all three recoveries.
2205          * Check if we need to update the current stateid.
2206          */
2207         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2208             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2209                 write_seqlock(&state->seqlock);
2210                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2211                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2212                 write_sequnlock(&state->seqlock);
2213         }
2214         return 0;
2215 }
2216
2217 /*
2218  * OPEN_RECLAIM:
2219  *      reclaim state on the server after a reboot.
2220  */
2221 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2222 {
2223         struct nfs_delegation *delegation;
2224         struct nfs4_opendata *opendata;
2225         fmode_t delegation_type = 0;
2226         int status;
2227
2228         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2229                         NFS4_OPEN_CLAIM_PREVIOUS);
2230         if (IS_ERR(opendata))
2231                 return PTR_ERR(opendata);
2232         rcu_read_lock();
2233         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2234         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2235                 delegation_type = delegation->type;
2236         rcu_read_unlock();
2237         opendata->o_arg.u.delegation_type = delegation_type;
2238         status = nfs4_open_recover(opendata, state);
2239         nfs4_opendata_put(opendata);
2240         return status;
2241 }
2242
2243 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2244 {
2245         struct nfs_server *server = NFS_SERVER(state->inode);
2246         struct nfs4_exception exception = { };
2247         int err;
2248         do {
2249                 err = _nfs4_do_open_reclaim(ctx, state);
2250                 trace_nfs4_open_reclaim(ctx, 0, err);
2251                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2252                         continue;
2253                 if (err != -NFS4ERR_DELAY)
2254                         break;
2255                 nfs4_handle_exception(server, err, &exception);
2256         } while (exception.retry);
2257         return err;
2258 }
2259
2260 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2261 {
2262         struct nfs_open_context *ctx;
2263         int ret;
2264
2265         ctx = nfs4_state_find_open_context(state);
2266         if (IS_ERR(ctx))
2267                 return -EAGAIN;
2268         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2269         nfs_state_clear_open_state_flags(state);
2270         ret = nfs4_do_open_reclaim(ctx, state);
2271         put_nfs_open_context(ctx);
2272         return ret;
2273 }
2274
2275 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)
2276 {
2277         switch (err) {
2278                 default:
2279                         printk(KERN_ERR "NFS: %s: unhandled error "
2280                                         "%d.\n", __func__, err);
2281                         fallthrough;
2282                 case 0:
2283                 case -ENOENT:
2284                 case -EAGAIN:
2285                 case -ESTALE:
2286                 case -ETIMEDOUT:
2287                         break;
2288                 case -NFS4ERR_BADSESSION:
2289                 case -NFS4ERR_BADSLOT:
2290                 case -NFS4ERR_BAD_HIGH_SLOT:
2291                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2292                 case -NFS4ERR_DEADSESSION:
2293                         return -EAGAIN;
2294                 case -NFS4ERR_STALE_CLIENTID:
2295                 case -NFS4ERR_STALE_STATEID:
2296                         /* Don't recall a delegation if it was lost */
2297                         nfs4_schedule_lease_recovery(server->nfs_client);
2298                         return -EAGAIN;
2299                 case -NFS4ERR_MOVED:
2300                         nfs4_schedule_migration_recovery(server);
2301                         return -EAGAIN;
2302                 case -NFS4ERR_LEASE_MOVED:
2303                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2304                         return -EAGAIN;
2305                 case -NFS4ERR_DELEG_REVOKED:
2306                 case -NFS4ERR_ADMIN_REVOKED:
2307                 case -NFS4ERR_EXPIRED:
2308                 case -NFS4ERR_BAD_STATEID:
2309                 case -NFS4ERR_OPENMODE:
2310                         nfs_inode_find_state_and_recover(state->inode,
2311                                         stateid);
2312                         nfs4_schedule_stateid_recovery(server, state);
2313                         return -EAGAIN;
2314                 case -NFS4ERR_DELAY:
2315                 case -NFS4ERR_GRACE:
2316                         ssleep(1);
2317                         return -EAGAIN;
2318                 case -ENOMEM:
2319                 case -NFS4ERR_DENIED:
2320                         if (fl) {
2321                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2322                                 if (lsp)
2323                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2324                         }
2325                         return 0;
2326         }
2327         return err;
2328 }
2329
2330 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2331                 struct nfs4_state *state, const nfs4_stateid *stateid)
2332 {
2333         struct nfs_server *server = NFS_SERVER(state->inode);
2334         struct nfs4_opendata *opendata;
2335         int err = 0;
2336
2337         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2338                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2339         if (IS_ERR(opendata))
2340                 return PTR_ERR(opendata);
2341         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2342         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2343                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2344                 if (err)
2345                         goto out;
2346         }
2347         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2348                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2349                 if (err)
2350                         goto out;
2351         }
2352         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2353                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2354                 if (err)
2355                         goto out;
2356         }
2357         nfs_state_clear_delegation(state);
2358 out:
2359         nfs4_opendata_put(opendata);
2360         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2361 }
2362
2363 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2364 {
2365         struct nfs4_opendata *data = calldata;
2366
2367         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2368                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2369 }
2370
2371 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2372 {
2373         struct nfs4_opendata *data = calldata;
2374
2375         nfs40_sequence_done(task, &data->c_res.seq_res);
2376
2377         data->rpc_status = task->tk_status;
2378         if (data->rpc_status == 0) {
2379                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2380                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2381                 renew_lease(data->o_res.server, data->timestamp);
2382                 data->rpc_done = true;
2383         }
2384 }
2385
2386 static void nfs4_open_confirm_release(void *calldata)
2387 {
2388         struct nfs4_opendata *data = calldata;
2389         struct nfs4_state *state = NULL;
2390
2391         /* If this request hasn't been cancelled, do nothing */
2392         if (!data->cancelled)
2393                 goto out_free;
2394         /* In case of error, no cleanup! */
2395         if (!data->rpc_done)
2396                 goto out_free;
2397         state = nfs4_opendata_to_nfs4_state(data);
2398         if (!IS_ERR(state))
2399                 nfs4_close_state(state, data->o_arg.fmode);
2400 out_free:
2401         nfs4_opendata_put(data);
2402 }
2403
2404 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2405         .rpc_call_prepare = nfs4_open_confirm_prepare,
2406         .rpc_call_done = nfs4_open_confirm_done,
2407         .rpc_release = nfs4_open_confirm_release,
2408 };
2409
2410 /*
2411  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2412  */
2413 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2414 {
2415         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2416         struct rpc_task *task;
2417         struct  rpc_message msg = {
2418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2419                 .rpc_argp = &data->c_arg,
2420                 .rpc_resp = &data->c_res,
2421                 .rpc_cred = data->owner->so_cred,
2422         };
2423         struct rpc_task_setup task_setup_data = {
2424                 .rpc_client = server->client,
2425                 .rpc_message = &msg,
2426                 .callback_ops = &nfs4_open_confirm_ops,
2427                 .callback_data = data,
2428                 .workqueue = nfsiod_workqueue,
2429                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2430         };
2431         int status;
2432
2433         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2434                                 data->is_recover);
2435         kref_get(&data->kref);
2436         data->rpc_done = false;
2437         data->rpc_status = 0;
2438         data->timestamp = jiffies;
2439         task = rpc_run_task(&task_setup_data);
2440         if (IS_ERR(task))
2441                 return PTR_ERR(task);
2442         status = rpc_wait_for_completion_task(task);
2443         if (status != 0) {
2444                 data->cancelled = true;
2445                 smp_wmb();
2446         } else
2447                 status = data->rpc_status;
2448         rpc_put_task(task);
2449         return status;
2450 }
2451
2452 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2453 {
2454         struct nfs4_opendata *data = calldata;
2455         struct nfs4_state_owner *sp = data->owner;
2456         struct nfs_client *clp = sp->so_server->nfs_client;
2457         enum open_claim_type4 claim = data->o_arg.claim;
2458
2459         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2460                 goto out_wait;
2461         /*
2462          * Check if we still need to send an OPEN call, or if we can use
2463          * a delegation instead.
2464          */
2465         if (data->state != NULL) {
2466                 struct nfs_delegation *delegation;
2467
2468                 if (can_open_cached(data->state, data->o_arg.fmode,
2469                                         data->o_arg.open_flags, claim))
2470                         goto out_no_action;
2471                 rcu_read_lock();
2472                 delegation = nfs4_get_valid_delegation(data->state->inode);
2473                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2474                         goto unlock_no_action;
2475                 rcu_read_unlock();
2476         }
2477         /* Update client id. */
2478         data->o_arg.clientid = clp->cl_clientid;
2479         switch (claim) {
2480         default:
2481                 break;
2482         case NFS4_OPEN_CLAIM_PREVIOUS:
2483         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2484         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2485                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2486                 fallthrough;
2487         case NFS4_OPEN_CLAIM_FH:
2488                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2489         }
2490         data->timestamp = jiffies;
2491         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2492                                 &data->o_arg.seq_args,
2493                                 &data->o_res.seq_res,
2494                                 task) != 0)
2495                 nfs_release_seqid(data->o_arg.seqid);
2496
2497         /* Set the create mode (note dependency on the session type) */
2498         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2499         if (data->o_arg.open_flags & O_EXCL) {
2500                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2501                 if (clp->cl_mvops->minor_version == 0) {
2502                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2503                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2504                          * because ACCESS will return permission denied for
2505                          * all bits until close */
2506                         data->o_res.access_request = data->o_arg.access = 0;
2507                 } else if (nfs4_has_persistent_session(clp))
2508                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2509         }
2510         return;
2511 unlock_no_action:
2512         trace_nfs4_cached_open(data->state);
2513         rcu_read_unlock();
2514 out_no_action:
2515         task->tk_action = NULL;
2516 out_wait:
2517         nfs4_sequence_done(task, &data->o_res.seq_res);
2518 }
2519
2520 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2521 {
2522         struct nfs4_opendata *data = calldata;
2523
2524         data->rpc_status = task->tk_status;
2525
2526         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2527                 return;
2528
2529         if (task->tk_status == 0) {
2530                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2531                         switch (data->o_res.f_attr->mode & S_IFMT) {
2532                         case S_IFREG:
2533                                 break;
2534                         case S_IFLNK:
2535                                 data->rpc_status = -ELOOP;
2536                                 break;
2537                         case S_IFDIR:
2538                                 data->rpc_status = -EISDIR;
2539                                 break;
2540                         default:
2541                                 data->rpc_status = -ENOTDIR;
2542                         }
2543                 }
2544                 renew_lease(data->o_res.server, data->timestamp);
2545                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2546                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2547         }
2548         data->rpc_done = true;
2549 }
2550
2551 static void nfs4_open_release(void *calldata)
2552 {
2553         struct nfs4_opendata *data = calldata;
2554         struct nfs4_state *state = NULL;
2555
2556         /* If this request hasn't been cancelled, do nothing */
2557         if (!data->cancelled)
2558                 goto out_free;
2559         /* In case of error, no cleanup! */
2560         if (data->rpc_status != 0 || !data->rpc_done)
2561                 goto out_free;
2562         /* In case we need an open_confirm, no cleanup! */
2563         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2564                 goto out_free;
2565         state = nfs4_opendata_to_nfs4_state(data);
2566         if (!IS_ERR(state))
2567                 nfs4_close_state(state, data->o_arg.fmode);
2568 out_free:
2569         nfs4_opendata_put(data);
2570 }
2571
2572 static const struct rpc_call_ops nfs4_open_ops = {
2573         .rpc_call_prepare = nfs4_open_prepare,
2574         .rpc_call_done = nfs4_open_done,
2575         .rpc_release = nfs4_open_release,
2576 };
2577
2578 static int nfs4_run_open_task(struct nfs4_opendata *data,
2579                               struct nfs_open_context *ctx)
2580 {
2581         struct inode *dir = d_inode(data->dir);
2582         struct nfs_server *server = NFS_SERVER(dir);
2583         struct nfs_openargs *o_arg = &data->o_arg;
2584         struct nfs_openres *o_res = &data->o_res;
2585         struct rpc_task *task;
2586         struct rpc_message msg = {
2587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2588                 .rpc_argp = o_arg,
2589                 .rpc_resp = o_res,
2590                 .rpc_cred = data->owner->so_cred,
2591         };
2592         struct rpc_task_setup task_setup_data = {
2593                 .rpc_client = server->client,
2594                 .rpc_message = &msg,
2595                 .callback_ops = &nfs4_open_ops,
2596                 .callback_data = data,
2597                 .workqueue = nfsiod_workqueue,
2598                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2599         };
2600         int status;
2601
2602         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2603                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2604
2605         kref_get(&data->kref);
2606         data->rpc_done = false;
2607         data->rpc_status = 0;
2608         data->cancelled = false;
2609         data->is_recover = false;
2610         if (!ctx) {
2611                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2612                 data->is_recover = true;
2613                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2614         } else {
2615                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2616                 pnfs_lgopen_prepare(data, ctx);
2617         }
2618         task = rpc_run_task(&task_setup_data);
2619         if (IS_ERR(task))
2620                 return PTR_ERR(task);
2621         status = rpc_wait_for_completion_task(task);
2622         if (status != 0) {
2623                 data->cancelled = true;
2624                 smp_wmb();
2625         } else
2626                 status = data->rpc_status;
2627         rpc_put_task(task);
2628
2629         return status;
2630 }
2631
2632 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2633 {
2634         struct inode *dir = d_inode(data->dir);
2635         struct nfs_openres *o_res = &data->o_res;
2636         int status;
2637
2638         status = nfs4_run_open_task(data, NULL);
2639         if (status != 0 || !data->rpc_done)
2640                 return status;
2641
2642         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2643
2644         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2645                 status = _nfs4_proc_open_confirm(data);
2646
2647         return status;
2648 }
2649
2650 /*
2651  * Additional permission checks in order to distinguish between an
2652  * open for read, and an open for execute. This works around the
2653  * fact that NFSv4 OPEN treats read and execute permissions as being
2654  * the same.
2655  * Note that in the non-execute case, we want to turn off permission
2656  * checking if we just created a new file (POSIX open() semantics).
2657  */
2658 static int nfs4_opendata_access(const struct cred *cred,
2659                                 struct nfs4_opendata *opendata,
2660                                 struct nfs4_state *state, fmode_t fmode)
2661 {
2662         struct nfs_access_entry cache;
2663         u32 mask, flags;
2664
2665         /* access call failed or for some reason the server doesn't
2666          * support any access modes -- defer access call until later */
2667         if (opendata->o_res.access_supported == 0)
2668                 return 0;
2669
2670         mask = 0;
2671         if (fmode & FMODE_EXEC) {
2672                 /* ONLY check for exec rights */
2673                 if (S_ISDIR(state->inode->i_mode))
2674                         mask = NFS4_ACCESS_LOOKUP;
2675                 else
2676                         mask = NFS4_ACCESS_EXECUTE;
2677         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2678                 mask = NFS4_ACCESS_READ;
2679
2680         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2681         nfs_access_add_cache(state->inode, &cache, cred);
2682
2683         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2684         if ((mask & ~cache.mask & flags) == 0)
2685                 return 0;
2686
2687         return -EACCES;
2688 }
2689
2690 /*
2691  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2692  */
2693 static int _nfs4_proc_open(struct nfs4_opendata *data,
2694                            struct nfs_open_context *ctx)
2695 {
2696         struct inode *dir = d_inode(data->dir);
2697         struct nfs_server *server = NFS_SERVER(dir);
2698         struct nfs_openargs *o_arg = &data->o_arg;
2699         struct nfs_openres *o_res = &data->o_res;
2700         int status;
2701
2702         status = nfs4_run_open_task(data, ctx);
2703         if (!data->rpc_done)
2704                 return status;
2705         if (status != 0) {
2706                 if (status == -NFS4ERR_BADNAME &&
2707                                 !(o_arg->open_flags & O_CREAT))
2708                         return -ENOENT;
2709                 return status;
2710         }
2711
2712         nfs_fattr_map_and_free_names(server, &data->f_attr);
2713
2714         if (o_arg->open_flags & O_CREAT) {
2715                 if (o_arg->open_flags & O_EXCL)
2716                         data->file_created = true;
2717                 else if (o_res->cinfo.before != o_res->cinfo.after)
2718                         data->file_created = true;
2719                 if (data->file_created ||
2720                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2721                         nfs4_update_changeattr(dir, &o_res->cinfo,
2722                                         o_res->f_attr->time_start,
2723                                         NFS_INO_INVALID_DATA);
2724         }
2725         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2726                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2727         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2728                 status = _nfs4_proc_open_confirm(data);
2729                 if (status != 0)
2730                         return status;
2731         }
2732         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2733                 struct nfs_fh *fh = &o_res->fh;
2734
2735                 nfs4_sequence_free_slot(&o_res->seq_res);
2736                 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2737                         fh = NFS_FH(d_inode(data->dentry));
2738                 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2739         }
2740         return 0;
2741 }
2742
2743 /*
2744  * OPEN_EXPIRED:
2745  *      reclaim state on the server after a network partition.
2746  *      Assumes caller holds the appropriate lock
2747  */
2748 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2749 {
2750         struct nfs4_opendata *opendata;
2751         int ret;
2752
2753         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2754         if (IS_ERR(opendata))
2755                 return PTR_ERR(opendata);
2756         /*
2757          * We're not recovering a delegation, so ask for no delegation.
2758          * Otherwise the recovery thread could deadlock with an outstanding
2759          * delegation return.
2760          */
2761         opendata->o_arg.open_flags = O_DIRECT;
2762         ret = nfs4_open_recover(opendata, state);
2763         if (ret == -ESTALE)
2764                 d_drop(ctx->dentry);
2765         nfs4_opendata_put(opendata);
2766         return ret;
2767 }
2768
2769 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2770 {
2771         struct nfs_server *server = NFS_SERVER(state->inode);
2772         struct nfs4_exception exception = { };
2773         int err;
2774
2775         do {
2776                 err = _nfs4_open_expired(ctx, state);
2777                 trace_nfs4_open_expired(ctx, 0, err);
2778                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2779                         continue;
2780                 switch (err) {
2781                 default:
2782                         goto out;
2783                 case -NFS4ERR_GRACE:
2784                 case -NFS4ERR_DELAY:
2785                         nfs4_handle_exception(server, err, &exception);
2786                         err = 0;
2787                 }
2788         } while (exception.retry);
2789 out:
2790         return err;
2791 }
2792
2793 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2794 {
2795         struct nfs_open_context *ctx;
2796         int ret;
2797
2798         ctx = nfs4_state_find_open_context(state);
2799         if (IS_ERR(ctx))
2800                 return -EAGAIN;
2801         ret = nfs4_do_open_expired(ctx, state);
2802         put_nfs_open_context(ctx);
2803         return ret;
2804 }
2805
2806 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2807                 const nfs4_stateid *stateid)
2808 {
2809         nfs_remove_bad_delegation(state->inode, stateid);
2810         nfs_state_clear_delegation(state);
2811 }
2812
2813 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2814 {
2815         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2816                 nfs_finish_clear_delegation_stateid(state, NULL);
2817 }
2818
2819 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2820 {
2821         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2822         nfs40_clear_delegation_stateid(state);
2823         nfs_state_clear_open_state_flags(state);
2824         return nfs4_open_expired(sp, state);
2825 }
2826
2827 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2828                 nfs4_stateid *stateid,
2829                 const struct cred *cred)
2830 {
2831         return -NFS4ERR_BAD_STATEID;
2832 }
2833
2834 #if defined(CONFIG_NFS_V4_1)
2835 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2836                 nfs4_stateid *stateid,
2837                 const struct cred *cred)
2838 {
2839         int status;
2840
2841         switch (stateid->type) {
2842         default:
2843                 break;
2844         case NFS4_INVALID_STATEID_TYPE:
2845         case NFS4_SPECIAL_STATEID_TYPE:
2846                 return -NFS4ERR_BAD_STATEID;
2847         case NFS4_REVOKED_STATEID_TYPE:
2848                 goto out_free;
2849         }
2850
2851         status = nfs41_test_stateid(server, stateid, cred);
2852         switch (status) {
2853         case -NFS4ERR_EXPIRED:
2854         case -NFS4ERR_ADMIN_REVOKED:
2855         case -NFS4ERR_DELEG_REVOKED:
2856                 break;
2857         default:
2858                 return status;
2859         }
2860 out_free:
2861         /* Ack the revoked state to the server */
2862         nfs41_free_stateid(server, stateid, cred, true);
2863         return -NFS4ERR_EXPIRED;
2864 }
2865
2866 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2867 {
2868         struct nfs_server *server = NFS_SERVER(state->inode);
2869         nfs4_stateid stateid;
2870         struct nfs_delegation *delegation;
2871         const struct cred *cred = NULL;
2872         int status, ret = NFS_OK;
2873
2874         /* Get the delegation credential for use by test/free_stateid */
2875         rcu_read_lock();
2876         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2877         if (delegation == NULL) {
2878                 rcu_read_unlock();
2879                 nfs_state_clear_delegation(state);
2880                 return NFS_OK;
2881         }
2882
2883         spin_lock(&delegation->lock);
2884         nfs4_stateid_copy(&stateid, &delegation->stateid);
2885
2886         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2887                                 &delegation->flags)) {
2888                 spin_unlock(&delegation->lock);
2889                 rcu_read_unlock();
2890                 return NFS_OK;
2891         }
2892
2893         if (delegation->cred)
2894                 cred = get_cred(delegation->cred);
2895         spin_unlock(&delegation->lock);
2896         rcu_read_unlock();
2897         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2898         trace_nfs4_test_delegation_stateid(state, NULL, status);
2899         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2900                 nfs_finish_clear_delegation_stateid(state, &stateid);
2901         else
2902                 ret = status;
2903
2904         put_cred(cred);
2905         return ret;
2906 }
2907
2908 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2909 {
2910         nfs4_stateid tmp;
2911
2912         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2913             nfs4_copy_delegation_stateid(state->inode, state->state,
2914                                 &tmp, NULL) &&
2915             nfs4_stateid_match_other(&state->stateid, &tmp))
2916                 nfs_state_set_delegation(state, &tmp, state->state);
2917         else
2918                 nfs_state_clear_delegation(state);
2919 }
2920
2921 /**
2922  * nfs41_check_expired_locks - possibly free a lock stateid
2923  *
2924  * @state: NFSv4 state for an inode
2925  *
2926  * Returns NFS_OK if recovery for this stateid is now finished.
2927  * Otherwise a negative NFS4ERR value is returned.
2928  */
2929 static int nfs41_check_expired_locks(struct nfs4_state *state)
2930 {
2931         int status, ret = NFS_OK;
2932         struct nfs4_lock_state *lsp, *prev = NULL;
2933         struct nfs_server *server = NFS_SERVER(state->inode);
2934
2935         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2936                 goto out;
2937
2938         spin_lock(&state->state_lock);
2939         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2940                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2941                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2942
2943                         refcount_inc(&lsp->ls_count);
2944                         spin_unlock(&state->state_lock);
2945
2946                         nfs4_put_lock_state(prev);
2947                         prev = lsp;
2948
2949                         status = nfs41_test_and_free_expired_stateid(server,
2950                                         &lsp->ls_stateid,
2951                                         cred);
2952                         trace_nfs4_test_lock_stateid(state, lsp, status);
2953                         if (status == -NFS4ERR_EXPIRED ||
2954                             status == -NFS4ERR_BAD_STATEID) {
2955                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2956                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2957                                 if (!recover_lost_locks)
2958                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2959                         } else if (status != NFS_OK) {
2960                                 ret = status;
2961                                 nfs4_put_lock_state(prev);
2962                                 goto out;
2963                         }
2964                         spin_lock(&state->state_lock);
2965                 }
2966         }
2967         spin_unlock(&state->state_lock);
2968         nfs4_put_lock_state(prev);
2969 out:
2970         return ret;
2971 }
2972
2973 /**
2974  * nfs41_check_open_stateid - possibly free an open stateid
2975  *
2976  * @state: NFSv4 state for an inode
2977  *
2978  * Returns NFS_OK if recovery for this stateid is now finished.
2979  * Otherwise a negative NFS4ERR value is returned.
2980  */
2981 static int nfs41_check_open_stateid(struct nfs4_state *state)
2982 {
2983         struct nfs_server *server = NFS_SERVER(state->inode);
2984         nfs4_stateid *stateid = &state->open_stateid;
2985         const struct cred *cred = state->owner->so_cred;
2986         int status;
2987
2988         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2989                 return -NFS4ERR_BAD_STATEID;
2990         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2991         trace_nfs4_test_open_stateid(state, NULL, status);
2992         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2993                 nfs_state_clear_open_state_flags(state);
2994                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2995                 return status;
2996         }
2997         if (nfs_open_stateid_recover_openmode(state))
2998                 return -NFS4ERR_OPENMODE;
2999         return NFS_OK;
3000 }
3001
3002 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
3003 {
3004         int status;
3005
3006         status = nfs41_check_delegation_stateid(state);
3007         if (status != NFS_OK)
3008                 return status;
3009         nfs41_delegation_recover_stateid(state);
3010
3011         status = nfs41_check_expired_locks(state);
3012         if (status != NFS_OK)
3013                 return status;
3014         status = nfs41_check_open_stateid(state);
3015         if (status != NFS_OK)
3016                 status = nfs4_open_expired(sp, state);
3017         return status;
3018 }
3019 #endif
3020
3021 /*
3022  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3023  * fields corresponding to attributes that were used to store the verifier.
3024  * Make sure we clobber those fields in the later setattr call
3025  */
3026 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3027                                 struct iattr *sattr, struct nfs4_label **label)
3028 {
3029         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3030         __u32 attrset[3];
3031         unsigned ret;
3032         unsigned i;
3033
3034         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3035                 attrset[i] = opendata->o_res.attrset[i];
3036                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3037                         attrset[i] &= ~bitmask[i];
3038         }
3039
3040         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3041                 sattr->ia_valid : 0;
3042
3043         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3044                 if (sattr->ia_valid & ATTR_ATIME_SET)
3045                         ret |= ATTR_ATIME_SET;
3046                 else
3047                         ret |= ATTR_ATIME;
3048         }
3049
3050         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3051                 if (sattr->ia_valid & ATTR_MTIME_SET)
3052                         ret |= ATTR_MTIME_SET;
3053                 else
3054                         ret |= ATTR_MTIME;
3055         }
3056
3057         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3058                 *label = NULL;
3059         return ret;
3060 }
3061
3062 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3063                 struct nfs_open_context *ctx)
3064 {
3065         struct nfs4_state_owner *sp = opendata->owner;
3066         struct nfs_server *server = sp->so_server;
3067         struct dentry *dentry;
3068         struct nfs4_state *state;
3069         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3070         struct inode *dir = d_inode(opendata->dir);
3071         unsigned long dir_verifier;
3072         int ret;
3073
3074         dir_verifier = nfs_save_change_attribute(dir);
3075
3076         ret = _nfs4_proc_open(opendata, ctx);
3077         if (ret != 0)
3078                 goto out;
3079
3080         state = _nfs4_opendata_to_nfs4_state(opendata);
3081         ret = PTR_ERR(state);
3082         if (IS_ERR(state))
3083                 goto out;
3084         ctx->state = state;
3085         if (server->caps & NFS_CAP_POSIX_LOCK)
3086                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3087         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3088                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3089         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3090                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3091
3092         dentry = opendata->dentry;
3093         if (d_really_is_negative(dentry)) {
3094                 struct dentry *alias;
3095                 d_drop(dentry);
3096                 alias = d_exact_alias(dentry, state->inode);
3097                 if (!alias)
3098                         alias = d_splice_alias(igrab(state->inode), dentry);
3099                 /* d_splice_alias() can't fail here - it's a non-directory */
3100                 if (alias) {
3101                         dput(ctx->dentry);
3102                         ctx->dentry = dentry = alias;
3103                 }
3104         }
3105
3106         switch(opendata->o_arg.claim) {
3107         default:
3108                 break;
3109         case NFS4_OPEN_CLAIM_NULL:
3110         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3111         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3112                 if (!opendata->rpc_done)
3113                         break;
3114                 if (opendata->o_res.delegation_type != 0)
3115                         dir_verifier = nfs_save_change_attribute(dir);
3116                 nfs_set_verifier(dentry, dir_verifier);
3117         }
3118
3119         /* Parse layoutget results before we check for access */
3120         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3121
3122         ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3123         if (ret != 0)
3124                 goto out;
3125
3126         if (d_inode(dentry) == state->inode)
3127                 nfs_inode_attach_open_context(ctx);
3128
3129 out:
3130         if (!opendata->cancelled) {
3131                 if (opendata->lgp) {
3132                         nfs4_lgopen_release(opendata->lgp);
3133                         opendata->lgp = NULL;
3134                 }
3135                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3136         }
3137         return ret;
3138 }
3139
3140 /*
3141  * Returns a referenced nfs4_state
3142  */
3143 static int _nfs4_do_open(struct inode *dir,
3144                         struct nfs_open_context *ctx,
3145                         int flags,
3146                         const struct nfs4_open_createattrs *c,
3147                         int *opened)
3148 {
3149         struct nfs4_state_owner  *sp;
3150         struct nfs4_state     *state = NULL;
3151         struct nfs_server       *server = NFS_SERVER(dir);
3152         struct nfs4_opendata *opendata;
3153         struct dentry *dentry = ctx->dentry;
3154         const struct cred *cred = ctx->cred;
3155         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3156         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3157         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3158         struct iattr *sattr = c->sattr;
3159         struct nfs4_label *label = c->label;
3160         int status;
3161
3162         /* Protect against reboot recovery conflicts */
3163         status = -ENOMEM;
3164         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3165         if (sp == NULL) {
3166                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3167                 goto out_err;
3168         }
3169         status = nfs4_client_recover_expired_lease(server->nfs_client);
3170         if (status != 0)
3171                 goto err_put_state_owner;
3172         if (d_really_is_positive(dentry))
3173                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3174         status = -ENOMEM;
3175         if (d_really_is_positive(dentry))
3176                 claim = NFS4_OPEN_CLAIM_FH;
3177         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3178                         c, claim, GFP_KERNEL);
3179         if (opendata == NULL)
3180                 goto err_put_state_owner;
3181
3182         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3183                 if (!opendata->f_attr.mdsthreshold) {
3184                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3185                         if (!opendata->f_attr.mdsthreshold)
3186                                 goto err_opendata_put;
3187                 }
3188                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3189         }
3190         if (d_really_is_positive(dentry))
3191                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3192
3193         status = _nfs4_open_and_get_state(opendata, ctx);
3194         if (status != 0)
3195                 goto err_opendata_put;
3196         state = ctx->state;
3197
3198         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3199             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3200                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3201                 /*
3202                  * send create attributes which was not set by open
3203                  * with an extra setattr.
3204                  */
3205                 if (attrs || label) {
3206                         unsigned ia_old = sattr->ia_valid;
3207
3208                         sattr->ia_valid = attrs;
3209                         nfs_fattr_init(opendata->o_res.f_attr);
3210                         status = nfs4_do_setattr(state->inode, cred,
3211                                         opendata->o_res.f_attr, sattr,
3212                                         ctx, label);
3213                         if (status == 0) {
3214                                 nfs_setattr_update_inode(state->inode, sattr,
3215                                                 opendata->o_res.f_attr);
3216                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3217                         }
3218                         sattr->ia_valid = ia_old;
3219                 }
3220         }
3221         if (opened && opendata->file_created)
3222                 *opened = 1;
3223
3224         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3225                 *ctx_th = opendata->f_attr.mdsthreshold;
3226                 opendata->f_attr.mdsthreshold = NULL;
3227         }
3228
3229         nfs4_opendata_put(opendata);
3230         nfs4_put_state_owner(sp);
3231         return 0;
3232 err_opendata_put:
3233         nfs4_opendata_put(opendata);
3234 err_put_state_owner:
3235         nfs4_put_state_owner(sp);
3236 out_err:
3237         return status;
3238 }
3239
3240
3241 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3242                                         struct nfs_open_context *ctx,
3243                                         int flags,
3244                                         struct iattr *sattr,
3245                                         struct nfs4_label *label,
3246                                         int *opened)
3247 {
3248         struct nfs_server *server = NFS_SERVER(dir);
3249         struct nfs4_exception exception = {
3250                 .interruptible = true,
3251         };
3252         struct nfs4_state *res;
3253         struct nfs4_open_createattrs c = {
3254                 .label = label,
3255                 .sattr = sattr,
3256                 .verf = {
3257                         [0] = (__u32)jiffies,
3258                         [1] = (__u32)current->pid,
3259                 },
3260         };
3261         int status;
3262
3263         do {
3264                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3265                 res = ctx->state;
3266                 trace_nfs4_open_file(ctx, flags, status);
3267                 if (status == 0)
3268                         break;
3269                 /* NOTE: BAD_SEQID means the server and client disagree about the
3270                  * book-keeping w.r.t. state-changing operations
3271                  * (OPEN/CLOSE/LOCK/LOCKU...)
3272                  * It is actually a sign of a bug on the client or on the server.
3273                  *
3274                  * If we receive a BAD_SEQID error in the particular case of
3275                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3276                  * have unhashed the old state_owner for us, and that we can
3277                  * therefore safely retry using a new one. We should still warn
3278                  * the user though...
3279                  */
3280                 if (status == -NFS4ERR_BAD_SEQID) {
3281                         pr_warn_ratelimited("NFS: v4 server %s "
3282                                         " returned a bad sequence-id error!\n",
3283                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3284                         exception.retry = 1;
3285                         continue;
3286                 }
3287                 /*
3288                  * BAD_STATEID on OPEN means that the server cancelled our
3289                  * state before it received the OPEN_CONFIRM.
3290                  * Recover by retrying the request as per the discussion
3291                  * on Page 181 of RFC3530.
3292                  */
3293                 if (status == -NFS4ERR_BAD_STATEID) {
3294                         exception.retry = 1;
3295                         continue;
3296                 }
3297                 if (status == -NFS4ERR_EXPIRED) {
3298                         nfs4_schedule_lease_recovery(server->nfs_client);
3299                         exception.retry = 1;
3300                         continue;
3301                 }
3302                 if (status == -EAGAIN) {
3303                         /* We must have found a delegation */
3304                         exception.retry = 1;
3305                         continue;
3306                 }
3307                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3308                         continue;
3309                 res = ERR_PTR(nfs4_handle_exception(server,
3310                                         status, &exception));
3311         } while (exception.retry);
3312         return res;
3313 }
3314
3315 static int _nfs4_do_setattr(struct inode *inode,
3316                             struct nfs_setattrargs *arg,
3317                             struct nfs_setattrres *res,
3318                             const struct cred *cred,
3319                             struct nfs_open_context *ctx)
3320 {
3321         struct nfs_server *server = NFS_SERVER(inode);
3322         struct rpc_message msg = {
3323                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3324                 .rpc_argp       = arg,
3325                 .rpc_resp       = res,
3326                 .rpc_cred       = cred,
3327         };
3328         const struct cred *delegation_cred = NULL;
3329         unsigned long timestamp = jiffies;
3330         bool truncate;
3331         int status;
3332
3333         nfs_fattr_init(res->fattr);
3334
3335         /* Servers should only apply open mode checks for file size changes */
3336         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3337         if (!truncate) {
3338                 nfs4_inode_make_writeable(inode);
3339                 goto zero_stateid;
3340         }
3341
3342         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3343                 /* Use that stateid */
3344         } else if (ctx != NULL && ctx->state) {
3345                 struct nfs_lock_context *l_ctx;
3346                 if (!nfs4_valid_open_stateid(ctx->state))
3347                         return -EBADF;
3348                 l_ctx = nfs_get_lock_context(ctx);
3349                 if (IS_ERR(l_ctx))
3350                         return PTR_ERR(l_ctx);
3351                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3352                                                 &arg->stateid, &delegation_cred);
3353                 nfs_put_lock_context(l_ctx);
3354                 if (status == -EIO)
3355                         return -EBADF;
3356                 else if (status == -EAGAIN)
3357                         goto zero_stateid;
3358         } else {
3359 zero_stateid:
3360                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3361         }
3362         if (delegation_cred)
3363                 msg.rpc_cred = delegation_cred;
3364
3365         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3366
3367         put_cred(delegation_cred);
3368         if (status == 0 && ctx != NULL)
3369                 renew_lease(server, timestamp);
3370         trace_nfs4_setattr(inode, &arg->stateid, status);
3371         return status;
3372 }
3373
3374 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3375                            struct nfs_fattr *fattr, struct iattr *sattr,
3376                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3377 {
3378         struct nfs_server *server = NFS_SERVER(inode);
3379         __u32 bitmask[NFS4_BITMASK_SZ];
3380         struct nfs4_state *state = ctx ? ctx->state : NULL;
3381         struct nfs_setattrargs  arg = {
3382                 .fh             = NFS_FH(inode),
3383                 .iap            = sattr,
3384                 .server         = server,
3385                 .bitmask = bitmask,
3386                 .label          = ilabel,
3387         };
3388         struct nfs_setattrres  res = {
3389                 .fattr          = fattr,
3390                 .server         = server,
3391         };
3392         struct nfs4_exception exception = {
3393                 .state = state,
3394                 .inode = inode,
3395                 .stateid = &arg.stateid,
3396         };
3397         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3398         int err;
3399
3400         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3401                 adjust_flags |= NFS_INO_INVALID_MODE;
3402         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3403                 adjust_flags |= NFS_INO_INVALID_OTHER;
3404
3405         do {
3406                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3407                                         inode, adjust_flags);
3408
3409                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3410                 switch (err) {
3411                 case -NFS4ERR_OPENMODE:
3412                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3413                                 pr_warn_once("NFSv4: server %s is incorrectly "
3414                                                 "applying open mode checks to "
3415                                                 "a SETATTR that is not "
3416                                                 "changing file size.\n",
3417                                                 server->nfs_client->cl_hostname);
3418                         }
3419                         if (state && !(state->state & FMODE_WRITE)) {
3420                                 err = -EBADF;
3421                                 if (sattr->ia_valid & ATTR_OPEN)
3422                                         err = -EACCES;
3423                                 goto out;
3424                         }
3425                 }
3426                 err = nfs4_handle_exception(server, err, &exception);
3427         } while (exception.retry);
3428 out:
3429         return err;
3430 }
3431
3432 static bool
3433 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3434 {
3435         if (inode == NULL || !nfs_have_layout(inode))
3436                 return false;
3437
3438         return pnfs_wait_on_layoutreturn(inode, task);
3439 }
3440
3441 /*
3442  * Update the seqid of an open stateid
3443  */
3444 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3445                 struct nfs4_state *state)
3446 {
3447         __be32 seqid_open;
3448         u32 dst_seqid;
3449         int seq;
3450
3451         for (;;) {
3452                 if (!nfs4_valid_open_stateid(state))
3453                         break;
3454                 seq = read_seqbegin(&state->seqlock);
3455                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3456                         nfs4_stateid_copy(dst, &state->open_stateid);
3457                         if (read_seqretry(&state->seqlock, seq))
3458                                 continue;
3459                         break;
3460                 }
3461                 seqid_open = state->open_stateid.seqid;
3462                 if (read_seqretry(&state->seqlock, seq))
3463                         continue;
3464
3465                 dst_seqid = be32_to_cpu(dst->seqid);
3466                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3467                         dst->seqid = seqid_open;
3468                 break;
3469         }
3470 }
3471
3472 /*
3473  * Update the seqid of an open stateid after receiving
3474  * NFS4ERR_OLD_STATEID
3475  */
3476 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3477                 struct nfs4_state *state)
3478 {
3479         __be32 seqid_open;
3480         u32 dst_seqid;
3481         bool ret;
3482         int seq, status = -EAGAIN;
3483         DEFINE_WAIT(wait);
3484
3485         for (;;) {
3486                 ret = false;
3487                 if (!nfs4_valid_open_stateid(state))
3488                         break;
3489                 seq = read_seqbegin(&state->seqlock);
3490                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3491                         if (read_seqretry(&state->seqlock, seq))
3492                                 continue;
3493                         break;
3494                 }
3495
3496                 write_seqlock(&state->seqlock);
3497                 seqid_open = state->open_stateid.seqid;
3498
3499                 dst_seqid = be32_to_cpu(dst->seqid);
3500
3501                 /* Did another OPEN bump the state's seqid?  try again: */
3502                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3503                         dst->seqid = seqid_open;
3504                         write_sequnlock(&state->seqlock);
3505                         ret = true;
3506                         break;
3507                 }
3508
3509                 /* server says we're behind but we haven't seen the update yet */
3510                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3511                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3512                 write_sequnlock(&state->seqlock);
3513                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3514
3515                 if (fatal_signal_pending(current))
3516                         status = -EINTR;
3517                 else
3518                         if (schedule_timeout(5*HZ) != 0)
3519                                 status = 0;
3520
3521                 finish_wait(&state->waitq, &wait);
3522
3523                 if (!status)
3524                         continue;
3525                 if (status == -EINTR)
3526                         break;
3527
3528                 /* we slept the whole 5 seconds, we must have lost a seqid */
3529                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3530                 ret = true;
3531                 break;
3532         }
3533
3534         return ret;
3535 }
3536
3537 struct nfs4_closedata {
3538         struct inode *inode;
3539         struct nfs4_state *state;
3540         struct nfs_closeargs arg;
3541         struct nfs_closeres res;
3542         struct {
3543                 struct nfs4_layoutreturn_args arg;
3544                 struct nfs4_layoutreturn_res res;
3545                 struct nfs4_xdr_opaque_data ld_private;
3546                 u32 roc_barrier;
3547                 bool roc;
3548         } lr;
3549         struct nfs_fattr fattr;
3550         unsigned long timestamp;
3551 };
3552
3553 static void nfs4_free_closedata(void *data)
3554 {
3555         struct nfs4_closedata *calldata = data;
3556         struct nfs4_state_owner *sp = calldata->state->owner;
3557         struct super_block *sb = calldata->state->inode->i_sb;
3558
3559         if (calldata->lr.roc)
3560                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3561                                 calldata->res.lr_ret);
3562         nfs4_put_open_state(calldata->state);
3563         nfs_free_seqid(calldata->arg.seqid);
3564         nfs4_put_state_owner(sp);
3565         nfs_sb_deactive(sb);
3566         kfree(calldata);
3567 }
3568
3569 static void nfs4_close_done(struct rpc_task *task, void *data)
3570 {
3571         struct nfs4_closedata *calldata = data;
3572         struct nfs4_state *state = calldata->state;
3573         struct nfs_server *server = NFS_SERVER(calldata->inode);
3574         nfs4_stateid *res_stateid = NULL;
3575         struct nfs4_exception exception = {
3576                 .state = state,
3577                 .inode = calldata->inode,
3578                 .stateid = &calldata->arg.stateid,
3579         };
3580
3581         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3582                 return;
3583         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3584
3585         /* Handle Layoutreturn errors */
3586         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3587                           &calldata->res.lr_ret) == -EAGAIN)
3588                 goto out_restart;
3589
3590         /* hmm. we are done with the inode, and in the process of freeing
3591          * the state_owner. we keep this around to process errors
3592          */
3593         switch (task->tk_status) {
3594                 case 0:
3595                         res_stateid = &calldata->res.stateid;
3596                         renew_lease(server, calldata->timestamp);
3597                         break;
3598                 case -NFS4ERR_ACCESS:
3599                         if (calldata->arg.bitmask != NULL) {
3600                                 calldata->arg.bitmask = NULL;
3601                                 calldata->res.fattr = NULL;
3602                                 goto out_restart;
3603
3604                         }
3605                         break;
3606                 case -NFS4ERR_OLD_STATEID:
3607                         /* Did we race with OPEN? */
3608                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3609                                                 state))
3610                                 goto out_restart;
3611                         goto out_release;
3612                 case -NFS4ERR_ADMIN_REVOKED:
3613                 case -NFS4ERR_STALE_STATEID:
3614                 case -NFS4ERR_EXPIRED:
3615                         nfs4_free_revoked_stateid(server,
3616                                         &calldata->arg.stateid,
3617                                         task->tk_msg.rpc_cred);
3618                         fallthrough;
3619                 case -NFS4ERR_BAD_STATEID:
3620                         if (calldata->arg.fmode == 0)
3621                                 break;
3622                         fallthrough;
3623                 default:
3624                         task->tk_status = nfs4_async_handle_exception(task,
3625                                         server, task->tk_status, &exception);
3626                         if (exception.retry)
3627                                 goto out_restart;
3628         }
3629         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3630                         res_stateid, calldata->arg.fmode);
3631 out_release:
3632         task->tk_status = 0;
3633         nfs_release_seqid(calldata->arg.seqid);
3634         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3635         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3636         return;
3637 out_restart:
3638         task->tk_status = 0;
3639         rpc_restart_call_prepare(task);
3640         goto out_release;
3641 }
3642
3643 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3644 {
3645         struct nfs4_closedata *calldata = data;
3646         struct nfs4_state *state = calldata->state;
3647         struct inode *inode = calldata->inode;
3648         struct nfs_server *server = NFS_SERVER(inode);
3649         struct pnfs_layout_hdr *lo;
3650         bool is_rdonly, is_wronly, is_rdwr;
3651         int call_close = 0;
3652
3653         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3654                 goto out_wait;
3655
3656         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3657         spin_lock(&state->owner->so_lock);
3658         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3659         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3660         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3661         /* Calculate the change in open mode */
3662         calldata->arg.fmode = 0;
3663         if (state->n_rdwr == 0) {
3664                 if (state->n_rdonly == 0)
3665                         call_close |= is_rdonly;
3666                 else if (is_rdonly)
3667                         calldata->arg.fmode |= FMODE_READ;
3668                 if (state->n_wronly == 0)
3669                         call_close |= is_wronly;
3670                 else if (is_wronly)
3671                         calldata->arg.fmode |= FMODE_WRITE;
3672                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3673                         call_close |= is_rdwr;
3674         } else if (is_rdwr)
3675                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3676
3677         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3678         if (!nfs4_valid_open_stateid(state))
3679                 call_close = 0;
3680         spin_unlock(&state->owner->so_lock);
3681
3682         if (!call_close) {
3683                 /* Note: exit _without_ calling nfs4_close_done */
3684                 goto out_no_action;
3685         }
3686
3687         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3688                 nfs_release_seqid(calldata->arg.seqid);
3689                 goto out_wait;
3690         }
3691
3692         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3693         if (lo && !pnfs_layout_is_valid(lo)) {
3694                 calldata->arg.lr_args = NULL;
3695                 calldata->res.lr_res = NULL;
3696         }
3697
3698         if (calldata->arg.fmode == 0)
3699                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3700
3701         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3702                 /* Close-to-open cache consistency revalidation */
3703                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3704                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3705                                          server->cache_consistency_bitmask,
3706                                          inode, 0);
3707                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3708                 } else
3709                         calldata->arg.bitmask = NULL;
3710         }
3711
3712         calldata->arg.share_access =
3713                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3714                                 calldata->arg.fmode, 0);
3715
3716         if (calldata->res.fattr == NULL)
3717                 calldata->arg.bitmask = NULL;
3718         else if (calldata->arg.bitmask == NULL)
3719                 calldata->res.fattr = NULL;
3720         calldata->timestamp = jiffies;
3721         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3722                                 &calldata->arg.seq_args,
3723                                 &calldata->res.seq_res,
3724                                 task) != 0)
3725                 nfs_release_seqid(calldata->arg.seqid);
3726         return;
3727 out_no_action:
3728         task->tk_action = NULL;
3729 out_wait:
3730         nfs4_sequence_done(task, &calldata->res.seq_res);
3731 }
3732
3733 static const struct rpc_call_ops nfs4_close_ops = {
3734         .rpc_call_prepare = nfs4_close_prepare,
3735         .rpc_call_done = nfs4_close_done,
3736         .rpc_release = nfs4_free_closedata,
3737 };
3738
3739 /*
3740  * It is possible for data to be read/written from a mem-mapped file
3741  * after the sys_close call (which hits the vfs layer as a flush).
3742  * This means that we can't safely call nfsv4 close on a file until
3743  * the inode is cleared. This in turn means that we are not good
3744  * NFSv4 citizens - we do not indicate to the server to update the file's
3745  * share state even when we are done with one of the three share
3746  * stateid's in the inode.
3747  *
3748  * NOTE: Caller must be holding the sp->so_owner semaphore!
3749  */
3750 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3751 {
3752         struct nfs_server *server = NFS_SERVER(state->inode);
3753         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3754         struct nfs4_closedata *calldata;
3755         struct nfs4_state_owner *sp = state->owner;
3756         struct rpc_task *task;
3757         struct rpc_message msg = {
3758                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3759                 .rpc_cred = state->owner->so_cred,
3760         };
3761         struct rpc_task_setup task_setup_data = {
3762                 .rpc_client = server->client,
3763                 .rpc_message = &msg,
3764                 .callback_ops = &nfs4_close_ops,
3765                 .workqueue = nfsiod_workqueue,
3766                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3767         };
3768         int status = -ENOMEM;
3769
3770         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3771                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3772
3773         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3774                 &task_setup_data.rpc_client, &msg);
3775
3776         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3777         if (calldata == NULL)
3778                 goto out;
3779         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3780         calldata->inode = state->inode;
3781         calldata->state = state;
3782         calldata->arg.fh = NFS_FH(state->inode);
3783         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3784                 goto out_free_calldata;
3785         /* Serialization for the sequence id */
3786         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3787         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3788         if (IS_ERR(calldata->arg.seqid))
3789                 goto out_free_calldata;
3790         nfs_fattr_init(&calldata->fattr);
3791         calldata->arg.fmode = 0;
3792         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3793         calldata->res.fattr = &calldata->fattr;
3794         calldata->res.seqid = calldata->arg.seqid;
3795         calldata->res.server = server;
3796         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3797         calldata->lr.roc = pnfs_roc(state->inode,
3798                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3799         if (calldata->lr.roc) {
3800                 calldata->arg.lr_args = &calldata->lr.arg;
3801                 calldata->res.lr_res = &calldata->lr.res;
3802         }
3803         nfs_sb_active(calldata->inode->i_sb);
3804
3805         msg.rpc_argp = &calldata->arg;
3806         msg.rpc_resp = &calldata->res;
3807         task_setup_data.callback_data = calldata;
3808         task = rpc_run_task(&task_setup_data);
3809         if (IS_ERR(task))
3810                 return PTR_ERR(task);
3811         status = 0;
3812         if (wait)
3813                 status = rpc_wait_for_completion_task(task);
3814         rpc_put_task(task);
3815         return status;
3816 out_free_calldata:
3817         kfree(calldata);
3818 out:
3819         nfs4_put_open_state(state);
3820         nfs4_put_state_owner(sp);
3821         return status;
3822 }
3823
3824 static struct inode *
3825 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3826                 int open_flags, struct iattr *attr, int *opened)
3827 {
3828         struct nfs4_state *state;
3829         struct nfs4_label l, *label;
3830
3831         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3832
3833         /* Protect against concurrent sillydeletes */
3834         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3835
3836         nfs4_label_release_security(label);
3837
3838         if (IS_ERR(state))
3839                 return ERR_CAST(state);
3840         return state->inode;
3841 }
3842
3843 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3844 {
3845         if (ctx->state == NULL)
3846                 return;
3847         if (is_sync)
3848                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3849         else
3850                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3851 }
3852
3853 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3854 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3855 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3856
3857 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3858 {
3859         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3860         struct nfs4_server_caps_arg args = {
3861                 .fhandle = fhandle,
3862                 .bitmask = bitmask,
3863         };
3864         struct nfs4_server_caps_res res = {};
3865         struct rpc_message msg = {
3866                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3867                 .rpc_argp = &args,
3868                 .rpc_resp = &res,
3869         };
3870         int status;
3871         int i;
3872
3873         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3874                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3875                      FATTR4_WORD0_LINK_SUPPORT |
3876                      FATTR4_WORD0_SYMLINK_SUPPORT |
3877                      FATTR4_WORD0_ACLSUPPORT |
3878                      FATTR4_WORD0_CASE_INSENSITIVE |
3879                      FATTR4_WORD0_CASE_PRESERVING;
3880         if (minorversion)
3881                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3882
3883         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3884         if (status == 0) {
3885                 /* Sanity check the server answers */
3886                 switch (minorversion) {
3887                 case 0:
3888                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3889                         res.attr_bitmask[2] = 0;
3890                         break;
3891                 case 1:
3892                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3893                         break;
3894                 case 2:
3895                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3896                 }
3897                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3898                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3899                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3900                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3901                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3902                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3903                         server->caps |= NFS_CAP_ACLS;
3904                 if (res.has_links != 0)
3905                         server->caps |= NFS_CAP_HARDLINKS;
3906                 if (res.has_symlinks != 0)
3907                         server->caps |= NFS_CAP_SYMLINKS;
3908                 if (res.case_insensitive)
3909                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3910                 if (res.case_preserving)
3911                         server->caps |= NFS_CAP_CASE_PRESERVING;
3912 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3913                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3914                         server->caps |= NFS_CAP_SECURITY_LABEL;
3915 #endif
3916                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3917                         server->caps |= NFS_CAP_FS_LOCATIONS;
3918                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3919                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3920                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3921                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3922                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3923                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3924                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3925                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3926                                 NFS_ATTR_FATTR_OWNER_NAME);
3927                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3928                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3929                                 NFS_ATTR_FATTR_GROUP_NAME);
3930                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3931                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3932                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3933                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3934                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3935                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3936                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3937                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3938                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3939                                 sizeof(server->attr_bitmask));
3940                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3941
3942                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3943                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3944                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3945                 server->cache_consistency_bitmask[2] = 0;
3946
3947                 /* Avoid a regression due to buggy server */
3948                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3949                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3950                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3951                         sizeof(server->exclcreat_bitmask));
3952
3953                 server->acl_bitmask = res.acl_bitmask;
3954                 server->fh_expire_type = res.fh_expire_type;
3955         }
3956
3957         return status;
3958 }
3959
3960 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3961 {
3962         struct nfs4_exception exception = {
3963                 .interruptible = true,
3964         };
3965         int err;
3966
3967         nfs4_server_set_init_caps(server);
3968         do {
3969                 err = nfs4_handle_exception(server,
3970                                 _nfs4_server_capabilities(server, fhandle),
3971                                 &exception);
3972         } while (exception.retry);
3973         return err;
3974 }
3975
3976 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3977                                           struct nfs_client *clp,
3978                                           struct nfs_server *server)
3979 {
3980         int i;
3981
3982         for (i = 0; i < location->nservers; i++) {
3983                 struct nfs4_string *srv_loc = &location->servers[i];
3984                 struct sockaddr_storage addr;
3985                 size_t addrlen;
3986                 struct xprt_create xprt_args = {
3987                         .ident = 0,
3988                         .net = clp->cl_net,
3989                 };
3990                 struct nfs4_add_xprt_data xprtdata = {
3991                         .clp = clp,
3992                 };
3993                 struct rpc_add_xprt_test rpcdata = {
3994                         .add_xprt_test = clp->cl_mvops->session_trunk,
3995                         .data = &xprtdata,
3996                 };
3997                 char *servername = NULL;
3998
3999                 if (!srv_loc->len)
4000                         continue;
4001
4002                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
4003                                                 &addr, sizeof(addr),
4004                                                 clp->cl_net, server->port);
4005                 if (!addrlen)
4006                         return;
4007                 xprt_args.dstaddr = (struct sockaddr *)&addr;
4008                 xprt_args.addrlen = addrlen;
4009                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
4010                 if (!servername)
4011                         return;
4012                 memcpy(servername, srv_loc->data, srv_loc->len);
4013                 servername[srv_loc->len] = '\0';
4014                 xprt_args.servername = servername;
4015
4016                 xprtdata.cred = nfs4_get_clid_cred(clp);
4017                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4018                                   rpc_clnt_setup_test_and_add_xprt,
4019                                   &rpcdata);
4020                 if (xprtdata.cred)
4021                         put_cred(xprtdata.cred);
4022                 kfree(servername);
4023         }
4024 }
4025
4026 static bool _is_same_nfs4_pathname(struct nfs4_pathname *path1,
4027                                    struct nfs4_pathname *path2)
4028 {
4029         int i;
4030
4031         if (path1->ncomponents != path2->ncomponents)
4032                 return false;
4033         for (i = 0; i < path1->ncomponents; i++) {
4034                 if (path1->components[i].len != path2->components[i].len)
4035                         return false;
4036                 if (memcmp(path1->components[i].data, path2->components[i].data,
4037                                 path1->components[i].len))
4038                         return false;
4039         }
4040         return true;
4041 }
4042
4043 static int _nfs4_discover_trunking(struct nfs_server *server,
4044                                    struct nfs_fh *fhandle)
4045 {
4046         struct nfs4_fs_locations *locations = NULL;
4047         struct page *page;
4048         const struct cred *cred;
4049         struct nfs_client *clp = server->nfs_client;
4050         const struct nfs4_state_maintenance_ops *ops =
4051                 clp->cl_mvops->state_renewal_ops;
4052         int status = -ENOMEM, i;
4053
4054         cred = ops->get_state_renewal_cred(clp);
4055         if (cred == NULL) {
4056                 cred = nfs4_get_clid_cred(clp);
4057                 if (cred == NULL)
4058                         return -ENOKEY;
4059         }
4060
4061         page = alloc_page(GFP_KERNEL);
4062         if (!page)
4063                 goto out_put_cred;
4064         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4065         if (!locations)
4066                 goto out_free;
4067         locations->fattr = nfs_alloc_fattr();
4068         if (!locations->fattr)
4069                 goto out_free_2;
4070
4071         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4072                                          cred);
4073         if (status)
4074                 goto out_free_3;
4075
4076         for (i = 0; i < locations->nlocations; i++) {
4077                 if (!_is_same_nfs4_pathname(&locations->fs_path,
4078                                         &locations->locations[i].rootpath))
4079                         continue;
4080                 test_fs_location_for_trunking(&locations->locations[i], clp,
4081                                               server);
4082         }
4083 out_free_3:
4084         kfree(locations->fattr);
4085 out_free_2:
4086         kfree(locations);
4087 out_free:
4088         __free_page(page);
4089 out_put_cred:
4090         put_cred(cred);
4091         return status;
4092 }
4093
4094 static int nfs4_discover_trunking(struct nfs_server *server,
4095                                   struct nfs_fh *fhandle)
4096 {
4097         struct nfs4_exception exception = {
4098                 .interruptible = true,
4099         };
4100         struct nfs_client *clp = server->nfs_client;
4101         int err = 0;
4102
4103         if (!nfs4_has_session(clp))
4104                 goto out;
4105         do {
4106                 err = nfs4_handle_exception(server,
4107                                 _nfs4_discover_trunking(server, fhandle),
4108                                 &exception);
4109         } while (exception.retry);
4110 out:
4111         return err;
4112 }
4113
4114 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4115                 struct nfs_fsinfo *info)
4116 {
4117         u32 bitmask[3];
4118         struct nfs4_lookup_root_arg args = {
4119                 .bitmask = bitmask,
4120         };
4121         struct nfs4_lookup_res res = {
4122                 .server = server,
4123                 .fattr = info->fattr,
4124                 .fh = fhandle,
4125         };
4126         struct rpc_message msg = {
4127                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4128                 .rpc_argp = &args,
4129                 .rpc_resp = &res,
4130         };
4131
4132         bitmask[0] = nfs4_fattr_bitmap[0];
4133         bitmask[1] = nfs4_fattr_bitmap[1];
4134         /*
4135          * Process the label in the upcoming getfattr
4136          */
4137         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4138
4139         nfs_fattr_init(info->fattr);
4140         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4141 }
4142
4143 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4144                 struct nfs_fsinfo *info)
4145 {
4146         struct nfs4_exception exception = {
4147                 .interruptible = true,
4148         };
4149         int err;
4150         do {
4151                 err = _nfs4_lookup_root(server, fhandle, info);
4152                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4153                 switch (err) {
4154                 case 0:
4155                 case -NFS4ERR_WRONGSEC:
4156                         goto out;
4157                 default:
4158                         err = nfs4_handle_exception(server, err, &exception);
4159                 }
4160         } while (exception.retry);
4161 out:
4162         return err;
4163 }
4164
4165 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4166                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4167 {
4168         struct rpc_auth_create_args auth_args = {
4169                 .pseudoflavor = flavor,
4170         };
4171         struct rpc_auth *auth;
4172
4173         auth = rpcauth_create(&auth_args, server->client);
4174         if (IS_ERR(auth))
4175                 return -EACCES;
4176         return nfs4_lookup_root(server, fhandle, info);
4177 }
4178
4179 /*
4180  * Retry pseudoroot lookup with various security flavors.  We do this when:
4181  *
4182  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4183  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4184  *
4185  * Returns zero on success, or a negative NFS4ERR value, or a
4186  * negative errno value.
4187  */
4188 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4189                               struct nfs_fsinfo *info)
4190 {
4191         /* Per 3530bis 15.33.5 */
4192         static const rpc_authflavor_t flav_array[] = {
4193                 RPC_AUTH_GSS_KRB5P,
4194                 RPC_AUTH_GSS_KRB5I,
4195                 RPC_AUTH_GSS_KRB5,
4196                 RPC_AUTH_UNIX,                  /* courtesy */
4197                 RPC_AUTH_NULL,
4198         };
4199         int status = -EPERM;
4200         size_t i;
4201
4202         if (server->auth_info.flavor_len > 0) {
4203                 /* try each flavor specified by user */
4204                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4205                         status = nfs4_lookup_root_sec(server, fhandle, info,
4206                                                 server->auth_info.flavors[i]);
4207                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4208                                 continue;
4209                         break;
4210                 }
4211         } else {
4212                 /* no flavors specified by user, try default list */
4213                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4214                         status = nfs4_lookup_root_sec(server, fhandle, info,
4215                                                       flav_array[i]);
4216                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4217                                 continue;
4218                         break;
4219                 }
4220         }
4221
4222         /*
4223          * -EACCES could mean that the user doesn't have correct permissions
4224          * to access the mount.  It could also mean that we tried to mount
4225          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4226          * existing mount programs don't handle -EACCES very well so it should
4227          * be mapped to -EPERM instead.
4228          */
4229         if (status == -EACCES)
4230                 status = -EPERM;
4231         return status;
4232 }
4233
4234 /**
4235  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4236  * @server: initialized nfs_server handle
4237  * @fhandle: we fill in the pseudo-fs root file handle
4238  * @info: we fill in an FSINFO struct
4239  * @auth_probe: probe the auth flavours
4240  *
4241  * Returns zero on success, or a negative errno.
4242  */
4243 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4244                          struct nfs_fsinfo *info,
4245                          bool auth_probe)
4246 {
4247         int status = 0;
4248
4249         if (!auth_probe)
4250                 status = nfs4_lookup_root(server, fhandle, info);
4251
4252         if (auth_probe || status == NFS4ERR_WRONGSEC)
4253                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4254                                 fhandle, info);
4255
4256         if (status == 0)
4257                 status = nfs4_server_capabilities(server, fhandle);
4258         if (status == 0)
4259                 status = nfs4_do_fsinfo(server, fhandle, info);
4260
4261         return nfs4_map_errors(status);
4262 }
4263
4264 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4265                               struct nfs_fsinfo *info)
4266 {
4267         int error;
4268         struct nfs_fattr *fattr = info->fattr;
4269
4270         error = nfs4_server_capabilities(server, mntfh);
4271         if (error < 0) {
4272                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4273                 return error;
4274         }
4275
4276         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4277         if (error < 0) {
4278                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4279                 goto out;
4280         }
4281
4282         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4283             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4284                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4285
4286 out:
4287         return error;
4288 }
4289
4290 /*
4291  * Get locations and (maybe) other attributes of a referral.
4292  * Note that we'll actually follow the referral later when
4293  * we detect fsid mismatch in inode revalidation
4294  */
4295 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4296                              const struct qstr *name, struct nfs_fattr *fattr,
4297                              struct nfs_fh *fhandle)
4298 {
4299         int status = -ENOMEM;
4300         struct page *page = NULL;
4301         struct nfs4_fs_locations *locations = NULL;
4302
4303         page = alloc_page(GFP_KERNEL);
4304         if (page == NULL)
4305                 goto out;
4306         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4307         if (locations == NULL)
4308                 goto out;
4309
4310         locations->fattr = fattr;
4311
4312         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4313         if (status != 0)
4314                 goto out;
4315
4316         /*
4317          * If the fsid didn't change, this is a migration event, not a
4318          * referral.  Cause us to drop into the exception handler, which
4319          * will kick off migration recovery.
4320          */
4321         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4322                 dprintk("%s: server did not return a different fsid for"
4323                         " a referral at %s\n", __func__, name->name);
4324                 status = -NFS4ERR_MOVED;
4325                 goto out;
4326         }
4327         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4328         nfs_fixup_referral_attributes(fattr);
4329         memset(fhandle, 0, sizeof(struct nfs_fh));
4330 out:
4331         if (page)
4332                 __free_page(page);
4333         kfree(locations);
4334         return status;
4335 }
4336
4337 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4338                                 struct nfs_fattr *fattr, struct inode *inode)
4339 {
4340         __u32 bitmask[NFS4_BITMASK_SZ];
4341         struct nfs4_getattr_arg args = {
4342                 .fh = fhandle,
4343                 .bitmask = bitmask,
4344         };
4345         struct nfs4_getattr_res res = {
4346                 .fattr = fattr,
4347                 .server = server,
4348         };
4349         struct rpc_message msg = {
4350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4351                 .rpc_argp = &args,
4352                 .rpc_resp = &res,
4353         };
4354         unsigned short task_flags = 0;
4355
4356         if (nfs4_has_session(server->nfs_client))
4357                 task_flags = RPC_TASK_MOVEABLE;
4358
4359         /* Is this is an attribute revalidation, subject to softreval? */
4360         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4361                 task_flags |= RPC_TASK_TIMEOUT;
4362
4363         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4364         nfs_fattr_init(fattr);
4365         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4366         return nfs4_do_call_sync(server->client, server, &msg,
4367                         &args.seq_args, &res.seq_res, task_flags);
4368 }
4369
4370 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4371                                 struct nfs_fattr *fattr, struct inode *inode)
4372 {
4373         struct nfs4_exception exception = {
4374                 .interruptible = true,
4375         };
4376         int err;
4377         do {
4378                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4379                 trace_nfs4_getattr(server, fhandle, fattr, err);
4380                 err = nfs4_handle_exception(server, err,
4381                                 &exception);
4382         } while (exception.retry);
4383         return err;
4384 }
4385
4386 /*
4387  * The file is not closed if it is opened due to the a request to change
4388  * the size of the file. The open call will not be needed once the
4389  * VFS layer lookup-intents are implemented.
4390  *
4391  * Close is called when the inode is destroyed.
4392  * If we haven't opened the file for O_WRONLY, we
4393  * need to in the size_change case to obtain a stateid.
4394  *
4395  * Got race?
4396  * Because OPEN is always done by name in nfsv4, it is
4397  * possible that we opened a different file by the same
4398  * name.  We can recognize this race condition, but we
4399  * can't do anything about it besides returning an error.
4400  *
4401  * This will be fixed with VFS changes (lookup-intent).
4402  */
4403 static int
4404 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4405                   struct iattr *sattr)
4406 {
4407         struct inode *inode = d_inode(dentry);
4408         const struct cred *cred = NULL;
4409         struct nfs_open_context *ctx = NULL;
4410         int status;
4411
4412         if (pnfs_ld_layoutret_on_setattr(inode) &&
4413             sattr->ia_valid & ATTR_SIZE &&
4414             sattr->ia_size < i_size_read(inode))
4415                 pnfs_commit_and_return_layout(inode);
4416
4417         nfs_fattr_init(fattr);
4418
4419         /* Deal with open(O_TRUNC) */
4420         if (sattr->ia_valid & ATTR_OPEN)
4421                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4422
4423         /* Optimization: if the end result is no change, don't RPC */
4424         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4425                 return 0;
4426
4427         /* Search for an existing open(O_WRITE) file */
4428         if (sattr->ia_valid & ATTR_FILE) {
4429
4430                 ctx = nfs_file_open_context(sattr->ia_file);
4431                 if (ctx)
4432                         cred = ctx->cred;
4433         }
4434
4435         /* Return any delegations if we're going to change ACLs */
4436         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4437                 nfs4_inode_make_writeable(inode);
4438
4439         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4440         if (status == 0) {
4441                 nfs_setattr_update_inode(inode, sattr, fattr);
4442                 nfs_setsecurity(inode, fattr);
4443         }
4444         return status;
4445 }
4446
4447 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4448                 struct dentry *dentry, struct nfs_fh *fhandle,
4449                 struct nfs_fattr *fattr)
4450 {
4451         struct nfs_server *server = NFS_SERVER(dir);
4452         int                    status;
4453         struct nfs4_lookup_arg args = {
4454                 .bitmask = server->attr_bitmask,
4455                 .dir_fh = NFS_FH(dir),
4456                 .name = &dentry->d_name,
4457         };
4458         struct nfs4_lookup_res res = {
4459                 .server = server,
4460                 .fattr = fattr,
4461                 .fh = fhandle,
4462         };
4463         struct rpc_message msg = {
4464                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4465                 .rpc_argp = &args,
4466                 .rpc_resp = &res,
4467         };
4468         unsigned short task_flags = 0;
4469
4470         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4471                 task_flags = RPC_TASK_MOVEABLE;
4472
4473         /* Is this is an attribute revalidation, subject to softreval? */
4474         if (nfs_lookup_is_soft_revalidate(dentry))
4475                 task_flags |= RPC_TASK_TIMEOUT;
4476
4477         args.bitmask = nfs4_bitmask(server, fattr->label);
4478
4479         nfs_fattr_init(fattr);
4480
4481         dprintk("NFS call  lookup %pd2\n", dentry);
4482         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4483         status = nfs4_do_call_sync(clnt, server, &msg,
4484                         &args.seq_args, &res.seq_res, task_flags);
4485         dprintk("NFS reply lookup: %d\n", status);
4486         return status;
4487 }
4488
4489 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4490 {
4491         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4492                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4493         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4494         fattr->nlink = 2;
4495 }
4496
4497 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4498                                    struct dentry *dentry, struct nfs_fh *fhandle,
4499                                    struct nfs_fattr *fattr)
4500 {
4501         struct nfs4_exception exception = {
4502                 .interruptible = true,
4503         };
4504         struct rpc_clnt *client = *clnt;
4505         const struct qstr *name = &dentry->d_name;
4506         int err;
4507         do {
4508                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4509                 trace_nfs4_lookup(dir, name, err);
4510                 switch (err) {
4511                 case -NFS4ERR_BADNAME:
4512                         err = -ENOENT;
4513                         goto out;
4514                 case -NFS4ERR_MOVED:
4515                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4516                         if (err == -NFS4ERR_MOVED)
4517                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4518                         goto out;
4519                 case -NFS4ERR_WRONGSEC:
4520                         err = -EPERM;
4521                         if (client != *clnt)
4522                                 goto out;
4523                         client = nfs4_negotiate_security(client, dir, name);
4524                         if (IS_ERR(client))
4525                                 return PTR_ERR(client);
4526
4527                         exception.retry = 1;
4528                         break;
4529                 default:
4530                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4531                 }
4532         } while (exception.retry);
4533
4534 out:
4535         if (err == 0)
4536                 *clnt = client;
4537         else if (client != *clnt)
4538                 rpc_shutdown_client(client);
4539
4540         return err;
4541 }
4542
4543 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4544                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4545 {
4546         int status;
4547         struct rpc_clnt *client = NFS_CLIENT(dir);
4548
4549         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4550         if (client != NFS_CLIENT(dir)) {
4551                 rpc_shutdown_client(client);
4552                 nfs_fixup_secinfo_attributes(fattr);
4553         }
4554         return status;
4555 }
4556
4557 struct rpc_clnt *
4558 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4559                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4560 {
4561         struct rpc_clnt *client = NFS_CLIENT(dir);
4562         int status;
4563
4564         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4565         if (status < 0)
4566                 return ERR_PTR(status);
4567         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4568 }
4569
4570 static int _nfs4_proc_lookupp(struct inode *inode,
4571                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4572 {
4573         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4574         struct nfs_server *server = NFS_SERVER(inode);
4575         int                    status;
4576         struct nfs4_lookupp_arg args = {
4577                 .bitmask = server->attr_bitmask,
4578                 .fh = NFS_FH(inode),
4579         };
4580         struct nfs4_lookupp_res res = {
4581                 .server = server,
4582                 .fattr = fattr,
4583                 .fh = fhandle,
4584         };
4585         struct rpc_message msg = {
4586                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4587                 .rpc_argp = &args,
4588                 .rpc_resp = &res,
4589         };
4590         unsigned short task_flags = 0;
4591
4592         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4593                 task_flags |= RPC_TASK_TIMEOUT;
4594
4595         args.bitmask = nfs4_bitmask(server, fattr->label);
4596
4597         nfs_fattr_init(fattr);
4598
4599         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4600         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4601                                 &res.seq_res, task_flags);
4602         dprintk("NFS reply lookupp: %d\n", status);
4603         return status;
4604 }
4605
4606 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4607                              struct nfs_fattr *fattr)
4608 {
4609         struct nfs4_exception exception = {
4610                 .interruptible = true,
4611         };
4612         int err;
4613         do {
4614                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4615                 trace_nfs4_lookupp(inode, err);
4616                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4617                                 &exception);
4618         } while (exception.retry);
4619         return err;
4620 }
4621
4622 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4623                              const struct cred *cred)
4624 {
4625         struct nfs_server *server = NFS_SERVER(inode);
4626         struct nfs4_accessargs args = {
4627                 .fh = NFS_FH(inode),
4628                 .access = entry->mask,
4629         };
4630         struct nfs4_accessres res = {
4631                 .server = server,
4632         };
4633         struct rpc_message msg = {
4634                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4635                 .rpc_argp = &args,
4636                 .rpc_resp = &res,
4637                 .rpc_cred = cred,
4638         };
4639         int status = 0;
4640
4641         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4642                 res.fattr = nfs_alloc_fattr();
4643                 if (res.fattr == NULL)
4644                         return -ENOMEM;
4645                 args.bitmask = server->cache_consistency_bitmask;
4646         }
4647         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4648         if (!status) {
4649                 nfs_access_set_mask(entry, res.access);
4650                 if (res.fattr)
4651                         nfs_refresh_inode(inode, res.fattr);
4652         }
4653         nfs_free_fattr(res.fattr);
4654         return status;
4655 }
4656
4657 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4658                             const struct cred *cred)
4659 {
4660         struct nfs4_exception exception = {
4661                 .interruptible = true,
4662         };
4663         int err;
4664         do {
4665                 err = _nfs4_proc_access(inode, entry, cred);
4666                 trace_nfs4_access(inode, err);
4667                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4668                                 &exception);
4669         } while (exception.retry);
4670         return err;
4671 }
4672
4673 /*
4674  * TODO: For the time being, we don't try to get any attributes
4675  * along with any of the zero-copy operations READ, READDIR,
4676  * READLINK, WRITE.
4677  *
4678  * In the case of the first three, we want to put the GETATTR
4679  * after the read-type operation -- this is because it is hard
4680  * to predict the length of a GETATTR response in v4, and thus
4681  * align the READ data correctly.  This means that the GETATTR
4682  * may end up partially falling into the page cache, and we should
4683  * shift it into the 'tail' of the xdr_buf before processing.
4684  * To do this efficiently, we need to know the total length
4685  * of data received, which doesn't seem to be available outside
4686  * of the RPC layer.
4687  *
4688  * In the case of WRITE, we also want to put the GETATTR after
4689  * the operation -- in this case because we want to make sure
4690  * we get the post-operation mtime and size.
4691  *
4692  * Both of these changes to the XDR layer would in fact be quite
4693  * minor, but I decided to leave them for a subsequent patch.
4694  */
4695 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4696                 unsigned int pgbase, unsigned int pglen)
4697 {
4698         struct nfs4_readlink args = {
4699                 .fh       = NFS_FH(inode),
4700                 .pgbase   = pgbase,
4701                 .pglen    = pglen,
4702                 .pages    = &page,
4703         };
4704         struct nfs4_readlink_res res;
4705         struct rpc_message msg = {
4706                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4707                 .rpc_argp = &args,
4708                 .rpc_resp = &res,
4709         };
4710
4711         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4712 }
4713
4714 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4715                 unsigned int pgbase, unsigned int pglen)
4716 {
4717         struct nfs4_exception exception = {
4718                 .interruptible = true,
4719         };
4720         int err;
4721         do {
4722                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4723                 trace_nfs4_readlink(inode, err);
4724                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4725                                 &exception);
4726         } while (exception.retry);
4727         return err;
4728 }
4729
4730 /*
4731  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4732  */
4733 static int
4734 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4735                  int flags)
4736 {
4737         struct nfs_server *server = NFS_SERVER(dir);
4738         struct nfs4_label l, *ilabel;
4739         struct nfs_open_context *ctx;
4740         struct nfs4_state *state;
4741         int status = 0;
4742
4743         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4744         if (IS_ERR(ctx))
4745                 return PTR_ERR(ctx);
4746
4747         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4748
4749         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4750                 sattr->ia_mode &= ~current_umask();
4751         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4752         if (IS_ERR(state)) {
4753                 status = PTR_ERR(state);
4754                 goto out;
4755         }
4756 out:
4757         nfs4_label_release_security(ilabel);
4758         put_nfs_open_context(ctx);
4759         return status;
4760 }
4761
4762 static int
4763 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4764 {
4765         struct nfs_server *server = NFS_SERVER(dir);
4766         struct nfs_removeargs args = {
4767                 .fh = NFS_FH(dir),
4768                 .name = *name,
4769         };
4770         struct nfs_removeres res = {
4771                 .server = server,
4772         };
4773         struct rpc_message msg = {
4774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4775                 .rpc_argp = &args,
4776                 .rpc_resp = &res,
4777         };
4778         unsigned long timestamp = jiffies;
4779         int status;
4780
4781         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4782         if (status == 0) {
4783                 spin_lock(&dir->i_lock);
4784                 /* Removing a directory decrements nlink in the parent */
4785                 if (ftype == NF4DIR && dir->i_nlink > 2)
4786                         nfs4_dec_nlink_locked(dir);
4787                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4788                                               NFS_INO_INVALID_DATA);
4789                 spin_unlock(&dir->i_lock);
4790         }
4791         return status;
4792 }
4793
4794 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4795 {
4796         struct nfs4_exception exception = {
4797                 .interruptible = true,
4798         };
4799         struct inode *inode = d_inode(dentry);
4800         int err;
4801
4802         if (inode) {
4803                 if (inode->i_nlink == 1)
4804                         nfs4_inode_return_delegation(inode);
4805                 else
4806                         nfs4_inode_make_writeable(inode);
4807         }
4808         do {
4809                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4810                 trace_nfs4_remove(dir, &dentry->d_name, err);
4811                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4812                                 &exception);
4813         } while (exception.retry);
4814         return err;
4815 }
4816
4817 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4818 {
4819         struct nfs4_exception exception = {
4820                 .interruptible = true,
4821         };
4822         int err;
4823
4824         do {
4825                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4826                 trace_nfs4_remove(dir, name, err);
4827                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4828                                 &exception);
4829         } while (exception.retry);
4830         return err;
4831 }
4832
4833 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4834                 struct dentry *dentry,
4835                 struct inode *inode)
4836 {
4837         struct nfs_removeargs *args = msg->rpc_argp;
4838         struct nfs_removeres *res = msg->rpc_resp;
4839
4840         res->server = NFS_SB(dentry->d_sb);
4841         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4842         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4843
4844         nfs_fattr_init(res->dir_attr);
4845
4846         if (inode) {
4847                 nfs4_inode_return_delegation(inode);
4848                 nfs_d_prune_case_insensitive_aliases(inode);
4849         }
4850 }
4851
4852 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4853 {
4854         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4855                         &data->args.seq_args,
4856                         &data->res.seq_res,
4857                         task);
4858 }
4859
4860 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4861 {
4862         struct nfs_unlinkdata *data = task->tk_calldata;
4863         struct nfs_removeres *res = &data->res;
4864
4865         if (!nfs4_sequence_done(task, &res->seq_res))
4866                 return 0;
4867         if (nfs4_async_handle_error(task, res->server, NULL,
4868                                     &data->timeout) == -EAGAIN)
4869                 return 0;
4870         if (task->tk_status == 0)
4871                 nfs4_update_changeattr(dir, &res->cinfo,
4872                                 res->dir_attr->time_start,
4873                                 NFS_INO_INVALID_DATA);
4874         return 1;
4875 }
4876
4877 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4878                 struct dentry *old_dentry,
4879                 struct dentry *new_dentry)
4880 {
4881         struct nfs_renameargs *arg = msg->rpc_argp;
4882         struct nfs_renameres *res = msg->rpc_resp;
4883         struct inode *old_inode = d_inode(old_dentry);
4884         struct inode *new_inode = d_inode(new_dentry);
4885
4886         if (old_inode)
4887                 nfs4_inode_make_writeable(old_inode);
4888         if (new_inode)
4889                 nfs4_inode_return_delegation(new_inode);
4890         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4891         res->server = NFS_SB(old_dentry->d_sb);
4892         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4893 }
4894
4895 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4896 {
4897         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4898                         &data->args.seq_args,
4899                         &data->res.seq_res,
4900                         task);
4901 }
4902
4903 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4904                                  struct inode *new_dir)
4905 {
4906         struct nfs_renamedata *data = task->tk_calldata;
4907         struct nfs_renameres *res = &data->res;
4908
4909         if (!nfs4_sequence_done(task, &res->seq_res))
4910                 return 0;
4911         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4912                 return 0;
4913
4914         if (task->tk_status == 0) {
4915                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4916                 if (new_dir != old_dir) {
4917                         /* Note: If we moved a directory, nlink will change */
4918                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4919                                         res->old_fattr->time_start,
4920                                         NFS_INO_INVALID_NLINK |
4921                                             NFS_INO_INVALID_DATA);
4922                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4923                                         res->new_fattr->time_start,
4924                                         NFS_INO_INVALID_NLINK |
4925                                             NFS_INO_INVALID_DATA);
4926                 } else
4927                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4928                                         res->old_fattr->time_start,
4929                                         NFS_INO_INVALID_DATA);
4930         }
4931         return 1;
4932 }
4933
4934 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4935 {
4936         struct nfs_server *server = NFS_SERVER(inode);
4937         __u32 bitmask[NFS4_BITMASK_SZ];
4938         struct nfs4_link_arg arg = {
4939                 .fh     = NFS_FH(inode),
4940                 .dir_fh = NFS_FH(dir),
4941                 .name   = name,
4942                 .bitmask = bitmask,
4943         };
4944         struct nfs4_link_res res = {
4945                 .server = server,
4946         };
4947         struct rpc_message msg = {
4948                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4949                 .rpc_argp = &arg,
4950                 .rpc_resp = &res,
4951         };
4952         int status = -ENOMEM;
4953
4954         res.fattr = nfs_alloc_fattr_with_label(server);
4955         if (res.fattr == NULL)
4956                 goto out;
4957
4958         nfs4_inode_make_writeable(inode);
4959         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4960                                 NFS_INO_INVALID_CHANGE);
4961         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4962         if (!status) {
4963                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4964                                        NFS_INO_INVALID_DATA);
4965                 nfs4_inc_nlink(inode);
4966                 status = nfs_post_op_update_inode(inode, res.fattr);
4967                 if (!status)
4968                         nfs_setsecurity(inode, res.fattr);
4969         }
4970
4971 out:
4972         nfs_free_fattr(res.fattr);
4973         return status;
4974 }
4975
4976 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4977 {
4978         struct nfs4_exception exception = {
4979                 .interruptible = true,
4980         };
4981         int err;
4982         do {
4983                 err = nfs4_handle_exception(NFS_SERVER(inode),
4984                                 _nfs4_proc_link(inode, dir, name),
4985                                 &exception);
4986         } while (exception.retry);
4987         return err;
4988 }
4989
4990 struct nfs4_createdata {
4991         struct rpc_message msg;
4992         struct nfs4_create_arg arg;
4993         struct nfs4_create_res res;
4994         struct nfs_fh fh;
4995         struct nfs_fattr fattr;
4996 };
4997
4998 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4999                 const struct qstr *name, struct iattr *sattr, u32 ftype)
5000 {
5001         struct nfs4_createdata *data;
5002
5003         data = kzalloc(sizeof(*data), GFP_KERNEL);
5004         if (data != NULL) {
5005                 struct nfs_server *server = NFS_SERVER(dir);
5006
5007                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
5008                 if (IS_ERR(data->fattr.label))
5009                         goto out_free;
5010
5011                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
5012                 data->msg.rpc_argp = &data->arg;
5013                 data->msg.rpc_resp = &data->res;
5014                 data->arg.dir_fh = NFS_FH(dir);
5015                 data->arg.server = server;
5016                 data->arg.name = name;
5017                 data->arg.attrs = sattr;
5018                 data->arg.ftype = ftype;
5019                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
5020                 data->arg.umask = current_umask();
5021                 data->res.server = server;
5022                 data->res.fh = &data->fh;
5023                 data->res.fattr = &data->fattr;
5024                 nfs_fattr_init(data->res.fattr);
5025         }
5026         return data;
5027 out_free:
5028         kfree(data);
5029         return NULL;
5030 }
5031
5032 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
5033 {
5034         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5035                                     &data->arg.seq_args, &data->res.seq_res, 1);
5036         if (status == 0) {
5037                 spin_lock(&dir->i_lock);
5038                 /* Creating a directory bumps nlink in the parent */
5039                 if (data->arg.ftype == NF4DIR)
5040                         nfs4_inc_nlink_locked(dir);
5041                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5042                                               data->res.fattr->time_start,
5043                                               NFS_INO_INVALID_DATA);
5044                 spin_unlock(&dir->i_lock);
5045                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5046         }
5047         return status;
5048 }
5049
5050 static void nfs4_free_createdata(struct nfs4_createdata *data)
5051 {
5052         nfs4_label_free(data->fattr.label);
5053         kfree(data);
5054 }
5055
5056 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5057                 struct folio *folio, unsigned int len, struct iattr *sattr,
5058                 struct nfs4_label *label)
5059 {
5060         struct page *page = &folio->page;
5061         struct nfs4_createdata *data;
5062         int status = -ENAMETOOLONG;
5063
5064         if (len > NFS4_MAXPATHLEN)
5065                 goto out;
5066
5067         status = -ENOMEM;
5068         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5069         if (data == NULL)
5070                 goto out;
5071
5072         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5073         data->arg.u.symlink.pages = &page;
5074         data->arg.u.symlink.len = len;
5075         data->arg.label = label;
5076
5077         status = nfs4_do_create(dir, dentry, data);
5078
5079         nfs4_free_createdata(data);
5080 out:
5081         return status;
5082 }
5083
5084 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5085                 struct folio *folio, unsigned int len, struct iattr *sattr)
5086 {
5087         struct nfs4_exception exception = {
5088                 .interruptible = true,
5089         };
5090         struct nfs4_label l, *label;
5091         int err;
5092
5093         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5094
5095         do {
5096                 err = _nfs4_proc_symlink(dir, dentry, folio, len, sattr, label);
5097                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5098                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5099                                 &exception);
5100         } while (exception.retry);
5101
5102         nfs4_label_release_security(label);
5103         return err;
5104 }
5105
5106 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5107                 struct iattr *sattr, struct nfs4_label *label)
5108 {
5109         struct nfs4_createdata *data;
5110         int status = -ENOMEM;
5111
5112         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5113         if (data == NULL)
5114                 goto out;
5115
5116         data->arg.label = label;
5117         status = nfs4_do_create(dir, dentry, data);
5118
5119         nfs4_free_createdata(data);
5120 out:
5121         return status;
5122 }
5123
5124 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5125                 struct iattr *sattr)
5126 {
5127         struct nfs_server *server = NFS_SERVER(dir);
5128         struct nfs4_exception exception = {
5129                 .interruptible = true,
5130         };
5131         struct nfs4_label l, *label;
5132         int err;
5133
5134         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5135
5136         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5137                 sattr->ia_mode &= ~current_umask();
5138         do {
5139                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5140                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5141                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5142                                 &exception);
5143         } while (exception.retry);
5144         nfs4_label_release_security(label);
5145
5146         return err;
5147 }
5148
5149 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5150                               struct nfs_readdir_res *nr_res)
5151 {
5152         struct inode            *dir = d_inode(nr_arg->dentry);
5153         struct nfs_server       *server = NFS_SERVER(dir);
5154         struct nfs4_readdir_arg args = {
5155                 .fh = NFS_FH(dir),
5156                 .pages = nr_arg->pages,
5157                 .pgbase = 0,
5158                 .count = nr_arg->page_len,
5159                 .plus = nr_arg->plus,
5160         };
5161         struct nfs4_readdir_res res;
5162         struct rpc_message msg = {
5163                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5164                 .rpc_argp = &args,
5165                 .rpc_resp = &res,
5166                 .rpc_cred = nr_arg->cred,
5167         };
5168         int                     status;
5169
5170         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5171                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5172         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5173                 args.bitmask = server->attr_bitmask_nl;
5174         else
5175                 args.bitmask = server->attr_bitmask;
5176
5177         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5178         res.pgbase = args.pgbase;
5179         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5180                         &res.seq_res, 0);
5181         if (status >= 0) {
5182                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5183                 status += args.pgbase;
5184         }
5185
5186         nfs_invalidate_atime(dir);
5187
5188         dprintk("%s: returns %d\n", __func__, status);
5189         return status;
5190 }
5191
5192 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5193                              struct nfs_readdir_res *res)
5194 {
5195         struct nfs4_exception exception = {
5196                 .interruptible = true,
5197         };
5198         int err;
5199         do {
5200                 err = _nfs4_proc_readdir(arg, res);
5201                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5202                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5203                                             err, &exception);
5204         } while (exception.retry);
5205         return err;
5206 }
5207
5208 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5209                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5210 {
5211         struct nfs4_createdata *data;
5212         int mode = sattr->ia_mode;
5213         int status = -ENOMEM;
5214
5215         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5216         if (data == NULL)
5217                 goto out;
5218
5219         if (S_ISFIFO(mode))
5220                 data->arg.ftype = NF4FIFO;
5221         else if (S_ISBLK(mode)) {
5222                 data->arg.ftype = NF4BLK;
5223                 data->arg.u.device.specdata1 = MAJOR(rdev);
5224                 data->arg.u.device.specdata2 = MINOR(rdev);
5225         }
5226         else if (S_ISCHR(mode)) {
5227                 data->arg.ftype = NF4CHR;
5228                 data->arg.u.device.specdata1 = MAJOR(rdev);
5229                 data->arg.u.device.specdata2 = MINOR(rdev);
5230         } else if (!S_ISSOCK(mode)) {
5231                 status = -EINVAL;
5232                 goto out_free;
5233         }
5234
5235         data->arg.label = label;
5236         status = nfs4_do_create(dir, dentry, data);
5237 out_free:
5238         nfs4_free_createdata(data);
5239 out:
5240         return status;
5241 }
5242
5243 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5244                 struct iattr *sattr, dev_t rdev)
5245 {
5246         struct nfs_server *server = NFS_SERVER(dir);
5247         struct nfs4_exception exception = {
5248                 .interruptible = true,
5249         };
5250         struct nfs4_label l, *label;
5251         int err;
5252
5253         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5254
5255         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5256                 sattr->ia_mode &= ~current_umask();
5257         do {
5258                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5259                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5260                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5261                                 &exception);
5262         } while (exception.retry);
5263
5264         nfs4_label_release_security(label);
5265
5266         return err;
5267 }
5268
5269 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5270                  struct nfs_fsstat *fsstat)
5271 {
5272         struct nfs4_statfs_arg args = {
5273                 .fh = fhandle,
5274                 .bitmask = server->attr_bitmask,
5275         };
5276         struct nfs4_statfs_res res = {
5277                 .fsstat = fsstat,
5278         };
5279         struct rpc_message msg = {
5280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5281                 .rpc_argp = &args,
5282                 .rpc_resp = &res,
5283         };
5284
5285         nfs_fattr_init(fsstat->fattr);
5286         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5287 }
5288
5289 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5290 {
5291         struct nfs4_exception exception = {
5292                 .interruptible = true,
5293         };
5294         int err;
5295         do {
5296                 err = nfs4_handle_exception(server,
5297                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5298                                 &exception);
5299         } while (exception.retry);
5300         return err;
5301 }
5302
5303 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5304                 struct nfs_fsinfo *fsinfo)
5305 {
5306         struct nfs4_fsinfo_arg args = {
5307                 .fh = fhandle,
5308                 .bitmask = server->attr_bitmask,
5309         };
5310         struct nfs4_fsinfo_res res = {
5311                 .fsinfo = fsinfo,
5312         };
5313         struct rpc_message msg = {
5314                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5315                 .rpc_argp = &args,
5316                 .rpc_resp = &res,
5317         };
5318
5319         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5320 }
5321
5322 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5323 {
5324         struct nfs4_exception exception = {
5325                 .interruptible = true,
5326         };
5327         int err;
5328
5329         do {
5330                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5331                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5332                 if (err == 0) {
5333                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5334                         break;
5335                 }
5336                 err = nfs4_handle_exception(server, err, &exception);
5337         } while (exception.retry);
5338         return err;
5339 }
5340
5341 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5342 {
5343         int error;
5344
5345         nfs_fattr_init(fsinfo->fattr);
5346         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5347         if (error == 0) {
5348                 /* block layout checks this! */
5349                 server->pnfs_blksize = fsinfo->blksize;
5350                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5351         }
5352
5353         return error;
5354 }
5355
5356 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5357                 struct nfs_pathconf *pathconf)
5358 {
5359         struct nfs4_pathconf_arg args = {
5360                 .fh = fhandle,
5361                 .bitmask = server->attr_bitmask,
5362         };
5363         struct nfs4_pathconf_res res = {
5364                 .pathconf = pathconf,
5365         };
5366         struct rpc_message msg = {
5367                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5368                 .rpc_argp = &args,
5369                 .rpc_resp = &res,
5370         };
5371
5372         /* None of the pathconf attributes are mandatory to implement */
5373         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5374                 memset(pathconf, 0, sizeof(*pathconf));
5375                 return 0;
5376         }
5377
5378         nfs_fattr_init(pathconf->fattr);
5379         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5380 }
5381
5382 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5383                 struct nfs_pathconf *pathconf)
5384 {
5385         struct nfs4_exception exception = {
5386                 .interruptible = true,
5387         };
5388         int err;
5389
5390         do {
5391                 err = nfs4_handle_exception(server,
5392                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5393                                 &exception);
5394         } while (exception.retry);
5395         return err;
5396 }
5397
5398 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5399                 const struct nfs_open_context *ctx,
5400                 const struct nfs_lock_context *l_ctx,
5401                 fmode_t fmode)
5402 {
5403         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5404 }
5405 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5406
5407 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5408                 const struct nfs_open_context *ctx,
5409                 const struct nfs_lock_context *l_ctx,
5410                 fmode_t fmode)
5411 {
5412         nfs4_stateid _current_stateid;
5413
5414         /* If the current stateid represents a lost lock, then exit */
5415         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5416                 return true;
5417         return nfs4_stateid_match(stateid, &_current_stateid);
5418 }
5419
5420 static bool nfs4_error_stateid_expired(int err)
5421 {
5422         switch (err) {
5423         case -NFS4ERR_DELEG_REVOKED:
5424         case -NFS4ERR_ADMIN_REVOKED:
5425         case -NFS4ERR_BAD_STATEID:
5426         case -NFS4ERR_STALE_STATEID:
5427         case -NFS4ERR_OLD_STATEID:
5428         case -NFS4ERR_OPENMODE:
5429         case -NFS4ERR_EXPIRED:
5430                 return true;
5431         }
5432         return false;
5433 }
5434
5435 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5436 {
5437         struct nfs_server *server = NFS_SERVER(hdr->inode);
5438
5439         trace_nfs4_read(hdr, task->tk_status);
5440         if (task->tk_status < 0) {
5441                 struct nfs4_exception exception = {
5442                         .inode = hdr->inode,
5443                         .state = hdr->args.context->state,
5444                         .stateid = &hdr->args.stateid,
5445                 };
5446                 task->tk_status = nfs4_async_handle_exception(task,
5447                                 server, task->tk_status, &exception);
5448                 if (exception.retry) {
5449                         rpc_restart_call_prepare(task);
5450                         return -EAGAIN;
5451                 }
5452         }
5453
5454         if (task->tk_status > 0)
5455                 renew_lease(server, hdr->timestamp);
5456         return 0;
5457 }
5458
5459 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5460                 struct nfs_pgio_args *args)
5461 {
5462
5463         if (!nfs4_error_stateid_expired(task->tk_status) ||
5464                 nfs4_stateid_is_current(&args->stateid,
5465                                 args->context,
5466                                 args->lock_context,
5467                                 FMODE_READ))
5468                 return false;
5469         rpc_restart_call_prepare(task);
5470         return true;
5471 }
5472
5473 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5474                                          struct nfs_pgio_header *hdr)
5475 {
5476         struct nfs_server *server = NFS_SERVER(hdr->inode);
5477         struct rpc_message *msg = &task->tk_msg;
5478
5479         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5480             task->tk_status == -ENOTSUPP) {
5481                 server->caps &= ~NFS_CAP_READ_PLUS;
5482                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5483                 rpc_restart_call_prepare(task);
5484                 return true;
5485         }
5486         return false;
5487 }
5488
5489 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5490 {
5491         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5492                 return -EAGAIN;
5493         if (nfs4_read_stateid_changed(task, &hdr->args))
5494                 return -EAGAIN;
5495         if (nfs4_read_plus_not_supported(task, hdr))
5496                 return -EAGAIN;
5497         if (task->tk_status > 0)
5498                 nfs_invalidate_atime(hdr->inode);
5499         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5500                                     nfs4_read_done_cb(task, hdr);
5501 }
5502
5503 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5504 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5505                                     struct rpc_message *msg)
5506 {
5507         /* Note: We don't use READ_PLUS with pNFS yet */
5508         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5509                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5510                 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5511         }
5512         return false;
5513 }
5514 #else
5515 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5516                                     struct rpc_message *msg)
5517 {
5518         return false;
5519 }
5520 #endif /* CONFIG_NFS_V4_2 */
5521
5522 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5523                                  struct rpc_message *msg)
5524 {
5525         hdr->timestamp   = jiffies;
5526         if (!hdr->pgio_done_cb)
5527                 hdr->pgio_done_cb = nfs4_read_done_cb;
5528         if (!nfs42_read_plus_support(hdr, msg))
5529                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5530         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5531 }
5532
5533 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5534                                       struct nfs_pgio_header *hdr)
5535 {
5536         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5537                         &hdr->args.seq_args,
5538                         &hdr->res.seq_res,
5539                         task))
5540                 return 0;
5541         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5542                                 hdr->args.lock_context,
5543                                 hdr->rw_mode) == -EIO)
5544                 return -EIO;
5545         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5546                 return -EIO;
5547         return 0;
5548 }
5549
5550 static int nfs4_write_done_cb(struct rpc_task *task,
5551                               struct nfs_pgio_header *hdr)
5552 {
5553         struct inode *inode = hdr->inode;
5554
5555         trace_nfs4_write(hdr, task->tk_status);
5556         if (task->tk_status < 0) {
5557                 struct nfs4_exception exception = {
5558                         .inode = hdr->inode,
5559                         .state = hdr->args.context->state,
5560                         .stateid = &hdr->args.stateid,
5561                 };
5562                 task->tk_status = nfs4_async_handle_exception(task,
5563                                 NFS_SERVER(inode), task->tk_status,
5564                                 &exception);
5565                 if (exception.retry) {
5566                         rpc_restart_call_prepare(task);
5567                         return -EAGAIN;
5568                 }
5569         }
5570         if (task->tk_status >= 0) {
5571                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5572                 nfs_writeback_update_inode(hdr);
5573         }
5574         return 0;
5575 }
5576
5577 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5578                 struct nfs_pgio_args *args)
5579 {
5580
5581         if (!nfs4_error_stateid_expired(task->tk_status) ||
5582                 nfs4_stateid_is_current(&args->stateid,
5583                                 args->context,
5584                                 args->lock_context,
5585                                 FMODE_WRITE))
5586                 return false;
5587         rpc_restart_call_prepare(task);
5588         return true;
5589 }
5590
5591 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5592 {
5593         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5594                 return -EAGAIN;
5595         if (nfs4_write_stateid_changed(task, &hdr->args))
5596                 return -EAGAIN;
5597         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5598                 nfs4_write_done_cb(task, hdr);
5599 }
5600
5601 static
5602 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5603 {
5604         /* Don't request attributes for pNFS or O_DIRECT writes */
5605         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5606                 return false;
5607         /* Otherwise, request attributes if and only if we don't hold
5608          * a delegation
5609          */
5610         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5611 }
5612
5613 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5614                       struct inode *inode, unsigned long cache_validity)
5615 {
5616         struct nfs_server *server = NFS_SERVER(inode);
5617         unsigned int i;
5618
5619         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5620         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5621
5622         if (cache_validity & NFS_INO_INVALID_CHANGE)
5623                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5624         if (cache_validity & NFS_INO_INVALID_ATIME)
5625                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5626         if (cache_validity & NFS_INO_INVALID_MODE)
5627                 bitmask[1] |= FATTR4_WORD1_MODE;
5628         if (cache_validity & NFS_INO_INVALID_OTHER)
5629                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5630         if (cache_validity & NFS_INO_INVALID_NLINK)
5631                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5632         if (cache_validity & NFS_INO_INVALID_CTIME)
5633                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5634         if (cache_validity & NFS_INO_INVALID_MTIME)
5635                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5636         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5637                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5638
5639         if (cache_validity & NFS_INO_INVALID_SIZE)
5640                 bitmask[0] |= FATTR4_WORD0_SIZE;
5641
5642         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5643                 bitmask[i] &= server->attr_bitmask[i];
5644 }
5645
5646 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5647                                   struct rpc_message *msg,
5648                                   struct rpc_clnt **clnt)
5649 {
5650         struct nfs_server *server = NFS_SERVER(hdr->inode);
5651
5652         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5653                 hdr->args.bitmask = NULL;
5654                 hdr->res.fattr = NULL;
5655         } else {
5656                 nfs4_bitmask_set(hdr->args.bitmask_store,
5657                                  server->cache_consistency_bitmask,
5658                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5659                 hdr->args.bitmask = hdr->args.bitmask_store;
5660         }
5661
5662         if (!hdr->pgio_done_cb)
5663                 hdr->pgio_done_cb = nfs4_write_done_cb;
5664         hdr->res.server = server;
5665         hdr->timestamp   = jiffies;
5666
5667         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5668         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5669         nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5670 }
5671
5672 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5673 {
5674         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5675                         &data->args.seq_args,
5676                         &data->res.seq_res,
5677                         task);
5678 }
5679
5680 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5681 {
5682         struct inode *inode = data->inode;
5683
5684         trace_nfs4_commit(data, task->tk_status);
5685         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5686                                     NULL, NULL) == -EAGAIN) {
5687                 rpc_restart_call_prepare(task);
5688                 return -EAGAIN;
5689         }
5690         return 0;
5691 }
5692
5693 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5694 {
5695         if (!nfs4_sequence_done(task, &data->res.seq_res))
5696                 return -EAGAIN;
5697         return data->commit_done_cb(task, data);
5698 }
5699
5700 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5701                                    struct rpc_clnt **clnt)
5702 {
5703         struct nfs_server *server = NFS_SERVER(data->inode);
5704
5705         if (data->commit_done_cb == NULL)
5706                 data->commit_done_cb = nfs4_commit_done_cb;
5707         data->res.server = server;
5708         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5709         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5710         nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5711                         NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5712 }
5713
5714 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5715                                 struct nfs_commitres *res)
5716 {
5717         struct inode *dst_inode = file_inode(dst);
5718         struct nfs_server *server = NFS_SERVER(dst_inode);
5719         struct rpc_message msg = {
5720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5721                 .rpc_argp = args,
5722                 .rpc_resp = res,
5723         };
5724
5725         args->fh = NFS_FH(dst_inode);
5726         return nfs4_call_sync(server->client, server, &msg,
5727                         &args->seq_args, &res->seq_res, 1);
5728 }
5729
5730 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5731 {
5732         struct nfs_commitargs args = {
5733                 .offset = offset,
5734                 .count = count,
5735         };
5736         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5737         struct nfs4_exception exception = { };
5738         int status;
5739
5740         do {
5741                 status = _nfs4_proc_commit(dst, &args, res);
5742                 status = nfs4_handle_exception(dst_server, status, &exception);
5743         } while (exception.retry);
5744
5745         return status;
5746 }
5747
5748 struct nfs4_renewdata {
5749         struct nfs_client       *client;
5750         unsigned long           timestamp;
5751 };
5752
5753 /*
5754  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5755  * standalone procedure for queueing an asynchronous RENEW.
5756  */
5757 static void nfs4_renew_release(void *calldata)
5758 {
5759         struct nfs4_renewdata *data = calldata;
5760         struct nfs_client *clp = data->client;
5761
5762         if (refcount_read(&clp->cl_count) > 1)
5763                 nfs4_schedule_state_renewal(clp);
5764         nfs_put_client(clp);
5765         kfree(data);
5766 }
5767
5768 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5769 {
5770         struct nfs4_renewdata *data = calldata;
5771         struct nfs_client *clp = data->client;
5772         unsigned long timestamp = data->timestamp;
5773
5774         trace_nfs4_renew_async(clp, task->tk_status);
5775         switch (task->tk_status) {
5776         case 0:
5777                 break;
5778         case -NFS4ERR_LEASE_MOVED:
5779                 nfs4_schedule_lease_moved_recovery(clp);
5780                 break;
5781         default:
5782                 /* Unless we're shutting down, schedule state recovery! */
5783                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5784                         return;
5785                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5786                         nfs4_schedule_lease_recovery(clp);
5787                         return;
5788                 }
5789                 nfs4_schedule_path_down_recovery(clp);
5790         }
5791         do_renew_lease(clp, timestamp);
5792 }
5793
5794 static const struct rpc_call_ops nfs4_renew_ops = {
5795         .rpc_call_done = nfs4_renew_done,
5796         .rpc_release = nfs4_renew_release,
5797 };
5798
5799 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5800 {
5801         struct rpc_message msg = {
5802                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5803                 .rpc_argp       = clp,
5804                 .rpc_cred       = cred,
5805         };
5806         struct nfs4_renewdata *data;
5807
5808         if (renew_flags == 0)
5809                 return 0;
5810         if (!refcount_inc_not_zero(&clp->cl_count))
5811                 return -EIO;
5812         data = kmalloc(sizeof(*data), GFP_NOFS);
5813         if (data == NULL) {
5814                 nfs_put_client(clp);
5815                 return -ENOMEM;
5816         }
5817         data->client = clp;
5818         data->timestamp = jiffies;
5819         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5820                         &nfs4_renew_ops, data);
5821 }
5822
5823 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5824 {
5825         struct rpc_message msg = {
5826                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5827                 .rpc_argp       = clp,
5828                 .rpc_cred       = cred,
5829         };
5830         unsigned long now = jiffies;
5831         int status;
5832
5833         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5834         if (status < 0)
5835                 return status;
5836         do_renew_lease(clp, now);
5837         return 0;
5838 }
5839
5840 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5841                                       enum nfs4_acl_type type)
5842 {
5843         switch (type) {
5844         default:
5845                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5846         case NFS4ACL_DACL:
5847                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5848         case NFS4ACL_SACL:
5849                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5850         }
5851 }
5852
5853 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5854  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5855  * the stack.
5856  */
5857 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5858
5859 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5860                 struct page **pages)
5861 {
5862         struct page *newpage, **spages;
5863         int rc = 0;
5864         size_t len;
5865         spages = pages;
5866
5867         do {
5868                 len = min_t(size_t, PAGE_SIZE, buflen);
5869                 newpage = alloc_page(GFP_KERNEL);
5870
5871                 if (newpage == NULL)
5872                         goto unwind;
5873                 memcpy(page_address(newpage), buf, len);
5874                 buf += len;
5875                 buflen -= len;
5876                 *pages++ = newpage;
5877                 rc++;
5878         } while (buflen != 0);
5879
5880         return rc;
5881
5882 unwind:
5883         for(; rc > 0; rc--)
5884                 __free_page(spages[rc-1]);
5885         return -ENOMEM;
5886 }
5887
5888 struct nfs4_cached_acl {
5889         enum nfs4_acl_type type;
5890         int cached;
5891         size_t len;
5892         char data[];
5893 };
5894
5895 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5896 {
5897         struct nfs_inode *nfsi = NFS_I(inode);
5898
5899         spin_lock(&inode->i_lock);
5900         kfree(nfsi->nfs4_acl);
5901         nfsi->nfs4_acl = acl;
5902         spin_unlock(&inode->i_lock);
5903 }
5904
5905 static void nfs4_zap_acl_attr(struct inode *inode)
5906 {
5907         nfs4_set_cached_acl(inode, NULL);
5908 }
5909
5910 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5911                                     size_t buflen, enum nfs4_acl_type type)
5912 {
5913         struct nfs_inode *nfsi = NFS_I(inode);
5914         struct nfs4_cached_acl *acl;
5915         int ret = -ENOENT;
5916
5917         spin_lock(&inode->i_lock);
5918         acl = nfsi->nfs4_acl;
5919         if (acl == NULL)
5920                 goto out;
5921         if (acl->type != type)
5922                 goto out;
5923         if (buf == NULL) /* user is just asking for length */
5924                 goto out_len;
5925         if (acl->cached == 0)
5926                 goto out;
5927         ret = -ERANGE; /* see getxattr(2) man page */
5928         if (acl->len > buflen)
5929                 goto out;
5930         memcpy(buf, acl->data, acl->len);
5931 out_len:
5932         ret = acl->len;
5933 out:
5934         spin_unlock(&inode->i_lock);
5935         return ret;
5936 }
5937
5938 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5939                                   size_t pgbase, size_t acl_len,
5940                                   enum nfs4_acl_type type)
5941 {
5942         struct nfs4_cached_acl *acl;
5943         size_t buflen = sizeof(*acl) + acl_len;
5944
5945         if (buflen <= PAGE_SIZE) {
5946                 acl = kmalloc(buflen, GFP_KERNEL);
5947                 if (acl == NULL)
5948                         goto out;
5949                 acl->cached = 1;
5950                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5951         } else {
5952                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5953                 if (acl == NULL)
5954                         goto out;
5955                 acl->cached = 0;
5956         }
5957         acl->type = type;
5958         acl->len = acl_len;
5959 out:
5960         nfs4_set_cached_acl(inode, acl);
5961 }
5962
5963 /*
5964  * The getxattr API returns the required buffer length when called with a
5965  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5966  * the required buf.  On a NULL buf, we send a page of data to the server
5967  * guessing that the ACL request can be serviced by a page. If so, we cache
5968  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5969  * the cache. If not so, we throw away the page, and cache the required
5970  * length. The next getxattr call will then produce another round trip to
5971  * the server, this time with the input buf of the required size.
5972  */
5973 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5974                                        size_t buflen, enum nfs4_acl_type type)
5975 {
5976         struct page **pages;
5977         struct nfs_getaclargs args = {
5978                 .fh = NFS_FH(inode),
5979                 .acl_type = type,
5980                 .acl_len = buflen,
5981         };
5982         struct nfs_getaclres res = {
5983                 .acl_type = type,
5984                 .acl_len = buflen,
5985         };
5986         struct rpc_message msg = {
5987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5988                 .rpc_argp = &args,
5989                 .rpc_resp = &res,
5990         };
5991         unsigned int npages;
5992         int ret = -ENOMEM, i;
5993         struct nfs_server *server = NFS_SERVER(inode);
5994
5995         if (buflen == 0)
5996                 buflen = server->rsize;
5997
5998         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5999         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
6000         if (!pages)
6001                 return -ENOMEM;
6002
6003         args.acl_pages = pages;
6004
6005         for (i = 0; i < npages; i++) {
6006                 pages[i] = alloc_page(GFP_KERNEL);
6007                 if (!pages[i])
6008                         goto out_free;
6009         }
6010
6011         /* for decoding across pages */
6012         res.acl_scratch = alloc_page(GFP_KERNEL);
6013         if (!res.acl_scratch)
6014                 goto out_free;
6015
6016         args.acl_len = npages * PAGE_SIZE;
6017
6018         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
6019                 __func__, buf, buflen, npages, args.acl_len);
6020         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
6021                              &msg, &args.seq_args, &res.seq_res, 0);
6022         if (ret)
6023                 goto out_free;
6024
6025         /* Handle the case where the passed-in buffer is too short */
6026         if (res.acl_flags & NFS4_ACL_TRUNC) {
6027                 /* Did the user only issue a request for the acl length? */
6028                 if (buf == NULL)
6029                         goto out_ok;
6030                 ret = -ERANGE;
6031                 goto out_free;
6032         }
6033         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
6034                               type);
6035         if (buf) {
6036                 if (res.acl_len > buflen) {
6037                         ret = -ERANGE;
6038                         goto out_free;
6039                 }
6040                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6041         }
6042 out_ok:
6043         ret = res.acl_len;
6044 out_free:
6045         while (--i >= 0)
6046                 __free_page(pages[i]);
6047         if (res.acl_scratch)
6048                 __free_page(res.acl_scratch);
6049         kfree(pages);
6050         return ret;
6051 }
6052
6053 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6054                                      size_t buflen, enum nfs4_acl_type type)
6055 {
6056         struct nfs4_exception exception = {
6057                 .interruptible = true,
6058         };
6059         ssize_t ret;
6060         do {
6061                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6062                 trace_nfs4_get_acl(inode, ret);
6063                 if (ret >= 0)
6064                         break;
6065                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6066         } while (exception.retry);
6067         return ret;
6068 }
6069
6070 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6071                                  enum nfs4_acl_type type)
6072 {
6073         struct nfs_server *server = NFS_SERVER(inode);
6074         int ret;
6075
6076         if (!nfs4_server_supports_acls(server, type))
6077                 return -EOPNOTSUPP;
6078         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6079         if (ret < 0)
6080                 return ret;
6081         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6082                 nfs_zap_acl_cache(inode);
6083         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6084         if (ret != -ENOENT)
6085                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6086                  * but no cached acl data, just the acl length */
6087                 return ret;
6088         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6089 }
6090
6091 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6092                                size_t buflen, enum nfs4_acl_type type)
6093 {
6094         struct nfs_server *server = NFS_SERVER(inode);
6095         struct page *pages[NFS4ACL_MAXPAGES];
6096         struct nfs_setaclargs arg = {
6097                 .fh = NFS_FH(inode),
6098                 .acl_type = type,
6099                 .acl_len = buflen,
6100                 .acl_pages = pages,
6101         };
6102         struct nfs_setaclres res;
6103         struct rpc_message msg = {
6104                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6105                 .rpc_argp       = &arg,
6106                 .rpc_resp       = &res,
6107         };
6108         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6109         int ret, i;
6110
6111         /* You can't remove system.nfs4_acl: */
6112         if (buflen == 0)
6113                 return -EINVAL;
6114         if (!nfs4_server_supports_acls(server, type))
6115                 return -EOPNOTSUPP;
6116         if (npages > ARRAY_SIZE(pages))
6117                 return -ERANGE;
6118         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6119         if (i < 0)
6120                 return i;
6121         nfs4_inode_make_writeable(inode);
6122         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6123
6124         /*
6125          * Free each page after tx, so the only ref left is
6126          * held by the network stack
6127          */
6128         for (; i > 0; i--)
6129                 put_page(pages[i-1]);
6130
6131         /*
6132          * Acl update can result in inode attribute update.
6133          * so mark the attribute cache invalid.
6134          */
6135         spin_lock(&inode->i_lock);
6136         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6137                                              NFS_INO_INVALID_CTIME |
6138                                              NFS_INO_REVAL_FORCED);
6139         spin_unlock(&inode->i_lock);
6140         nfs_access_zap_cache(inode);
6141         nfs_zap_acl_cache(inode);
6142         return ret;
6143 }
6144
6145 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6146                              size_t buflen, enum nfs4_acl_type type)
6147 {
6148         struct nfs4_exception exception = { };
6149         int err;
6150         do {
6151                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6152                 trace_nfs4_set_acl(inode, err);
6153                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6154                         /*
6155                          * no need to retry since the kernel
6156                          * isn't involved in encoding the ACEs.
6157                          */
6158                         err = -EINVAL;
6159                         break;
6160                 }
6161                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6162                                 &exception);
6163         } while (exception.retry);
6164         return err;
6165 }
6166
6167 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6168 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6169                                         size_t buflen)
6170 {
6171         struct nfs_server *server = NFS_SERVER(inode);
6172         struct nfs4_label label = {0, 0, buflen, buf};
6173
6174         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6175         struct nfs_fattr fattr = {
6176                 .label = &label,
6177         };
6178         struct nfs4_getattr_arg arg = {
6179                 .fh             = NFS_FH(inode),
6180                 .bitmask        = bitmask,
6181         };
6182         struct nfs4_getattr_res res = {
6183                 .fattr          = &fattr,
6184                 .server         = server,
6185         };
6186         struct rpc_message msg = {
6187                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6188                 .rpc_argp       = &arg,
6189                 .rpc_resp       = &res,
6190         };
6191         int ret;
6192
6193         nfs_fattr_init(&fattr);
6194
6195         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6196         if (ret)
6197                 return ret;
6198         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6199                 return -ENOENT;
6200         return label.len;
6201 }
6202
6203 static int nfs4_get_security_label(struct inode *inode, void *buf,
6204                                         size_t buflen)
6205 {
6206         struct nfs4_exception exception = {
6207                 .interruptible = true,
6208         };
6209         int err;
6210
6211         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6212                 return -EOPNOTSUPP;
6213
6214         do {
6215                 err = _nfs4_get_security_label(inode, buf, buflen);
6216                 trace_nfs4_get_security_label(inode, err);
6217                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6218                                 &exception);
6219         } while (exception.retry);
6220         return err;
6221 }
6222
6223 static int _nfs4_do_set_security_label(struct inode *inode,
6224                 struct nfs4_label *ilabel,
6225                 struct nfs_fattr *fattr)
6226 {
6227
6228         struct iattr sattr = {0};
6229         struct nfs_server *server = NFS_SERVER(inode);
6230         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6231         struct nfs_setattrargs arg = {
6232                 .fh             = NFS_FH(inode),
6233                 .iap            = &sattr,
6234                 .server         = server,
6235                 .bitmask        = bitmask,
6236                 .label          = ilabel,
6237         };
6238         struct nfs_setattrres res = {
6239                 .fattr          = fattr,
6240                 .server         = server,
6241         };
6242         struct rpc_message msg = {
6243                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6244                 .rpc_argp       = &arg,
6245                 .rpc_resp       = &res,
6246         };
6247         int status;
6248
6249         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6250
6251         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6252         if (status)
6253                 dprintk("%s failed: %d\n", __func__, status);
6254
6255         return status;
6256 }
6257
6258 static int nfs4_do_set_security_label(struct inode *inode,
6259                 struct nfs4_label *ilabel,
6260                 struct nfs_fattr *fattr)
6261 {
6262         struct nfs4_exception exception = { };
6263         int err;
6264
6265         do {
6266                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6267                 trace_nfs4_set_security_label(inode, err);
6268                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6269                                 &exception);
6270         } while (exception.retry);
6271         return err;
6272 }
6273
6274 static int
6275 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6276 {
6277         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6278         struct nfs_fattr *fattr;
6279         int status;
6280
6281         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6282                 return -EOPNOTSUPP;
6283
6284         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6285         if (fattr == NULL)
6286                 return -ENOMEM;
6287
6288         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6289         if (status == 0)
6290                 nfs_setsecurity(inode, fattr);
6291
6292         nfs_free_fattr(fattr);
6293         return status;
6294 }
6295 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6296
6297
6298 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6299                                     nfs4_verifier *bootverf)
6300 {
6301         __be32 verf[2];
6302
6303         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6304                 /* An impossible timestamp guarantees this value
6305                  * will never match a generated boot time. */
6306                 verf[0] = cpu_to_be32(U32_MAX);
6307                 verf[1] = cpu_to_be32(U32_MAX);
6308         } else {
6309                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6310                 u64 ns = ktime_to_ns(nn->boot_time);
6311
6312                 verf[0] = cpu_to_be32(ns >> 32);
6313                 verf[1] = cpu_to_be32(ns);
6314         }
6315         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6316 }
6317
6318 static size_t
6319 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6320 {
6321         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6322         struct nfs_netns_client *nn_clp = nn->nfs_client;
6323         const char *id;
6324
6325         buf[0] = '\0';
6326
6327         if (nn_clp) {
6328                 rcu_read_lock();
6329                 id = rcu_dereference(nn_clp->identifier);
6330                 if (id)
6331                         strscpy(buf, id, buflen);
6332                 rcu_read_unlock();
6333         }
6334
6335         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6336                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6337
6338         return strlen(buf);
6339 }
6340
6341 static int
6342 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6343 {
6344         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6345         size_t buflen;
6346         size_t len;
6347         char *str;
6348
6349         if (clp->cl_owner_id != NULL)
6350                 return 0;
6351
6352         rcu_read_lock();
6353         len = 14 +
6354                 strlen(clp->cl_rpcclient->cl_nodename) +
6355                 1 +
6356                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6357                 1;
6358         rcu_read_unlock();
6359
6360         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6361         if (buflen)
6362                 len += buflen + 1;
6363
6364         if (len > NFS4_OPAQUE_LIMIT + 1)
6365                 return -EINVAL;
6366
6367         /*
6368          * Since this string is allocated at mount time, and held until the
6369          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6370          * about a memory-reclaim deadlock.
6371          */
6372         str = kmalloc(len, GFP_KERNEL);
6373         if (!str)
6374                 return -ENOMEM;
6375
6376         rcu_read_lock();
6377         if (buflen)
6378                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6379                           clp->cl_rpcclient->cl_nodename, buf,
6380                           rpc_peeraddr2str(clp->cl_rpcclient,
6381                                            RPC_DISPLAY_ADDR));
6382         else
6383                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6384                           clp->cl_rpcclient->cl_nodename,
6385                           rpc_peeraddr2str(clp->cl_rpcclient,
6386                                            RPC_DISPLAY_ADDR));
6387         rcu_read_unlock();
6388
6389         clp->cl_owner_id = str;
6390         return 0;
6391 }
6392
6393 static int
6394 nfs4_init_uniform_client_string(struct nfs_client *clp)
6395 {
6396         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6397         size_t buflen;
6398         size_t len;
6399         char *str;
6400
6401         if (clp->cl_owner_id != NULL)
6402                 return 0;
6403
6404         len = 10 + 10 + 1 + 10 + 1 +
6405                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6406
6407         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6408         if (buflen)
6409                 len += buflen + 1;
6410
6411         if (len > NFS4_OPAQUE_LIMIT + 1)
6412                 return -EINVAL;
6413
6414         /*
6415          * Since this string is allocated at mount time, and held until the
6416          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6417          * about a memory-reclaim deadlock.
6418          */
6419         str = kmalloc(len, GFP_KERNEL);
6420         if (!str)
6421                 return -ENOMEM;
6422
6423         if (buflen)
6424                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6425                           clp->rpc_ops->version, clp->cl_minorversion,
6426                           buf, clp->cl_rpcclient->cl_nodename);
6427         else
6428                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6429                           clp->rpc_ops->version, clp->cl_minorversion,
6430                           clp->cl_rpcclient->cl_nodename);
6431         clp->cl_owner_id = str;
6432         return 0;
6433 }
6434
6435 /*
6436  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6437  * services.  Advertise one based on the address family of the
6438  * clientaddr.
6439  */
6440 static unsigned int
6441 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6442 {
6443         if (strchr(clp->cl_ipaddr, ':') != NULL)
6444                 return scnprintf(buf, len, "tcp6");
6445         else
6446                 return scnprintf(buf, len, "tcp");
6447 }
6448
6449 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6450 {
6451         struct nfs4_setclientid *sc = calldata;
6452
6453         if (task->tk_status == 0)
6454                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6455 }
6456
6457 static const struct rpc_call_ops nfs4_setclientid_ops = {
6458         .rpc_call_done = nfs4_setclientid_done,
6459 };
6460
6461 /**
6462  * nfs4_proc_setclientid - Negotiate client ID
6463  * @clp: state data structure
6464  * @program: RPC program for NFSv4 callback service
6465  * @port: IP port number for NFS4 callback service
6466  * @cred: credential to use for this call
6467  * @res: where to place the result
6468  *
6469  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6470  */
6471 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6472                 unsigned short port, const struct cred *cred,
6473                 struct nfs4_setclientid_res *res)
6474 {
6475         nfs4_verifier sc_verifier;
6476         struct nfs4_setclientid setclientid = {
6477                 .sc_verifier = &sc_verifier,
6478                 .sc_prog = program,
6479                 .sc_clnt = clp,
6480         };
6481         struct rpc_message msg = {
6482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6483                 .rpc_argp = &setclientid,
6484                 .rpc_resp = res,
6485                 .rpc_cred = cred,
6486         };
6487         struct rpc_task_setup task_setup_data = {
6488                 .rpc_client = clp->cl_rpcclient,
6489                 .rpc_message = &msg,
6490                 .callback_ops = &nfs4_setclientid_ops,
6491                 .callback_data = &setclientid,
6492                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6493         };
6494         unsigned long now = jiffies;
6495         int status;
6496
6497         /* nfs_client_id4 */
6498         nfs4_init_boot_verifier(clp, &sc_verifier);
6499
6500         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6501                 status = nfs4_init_uniform_client_string(clp);
6502         else
6503                 status = nfs4_init_nonuniform_client_string(clp);
6504
6505         if (status)
6506                 goto out;
6507
6508         /* cb_client4 */
6509         setclientid.sc_netid_len =
6510                                 nfs4_init_callback_netid(clp,
6511                                                 setclientid.sc_netid,
6512                                                 sizeof(setclientid.sc_netid));
6513         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6514                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6515                                 clp->cl_ipaddr, port >> 8, port & 255);
6516
6517         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6518                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6519                 clp->cl_owner_id);
6520
6521         status = nfs4_call_sync_custom(&task_setup_data);
6522         if (setclientid.sc_cred) {
6523                 kfree(clp->cl_acceptor);
6524                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6525                 put_rpccred(setclientid.sc_cred);
6526         }
6527
6528         if (status == 0)
6529                 do_renew_lease(clp, now);
6530 out:
6531         trace_nfs4_setclientid(clp, status);
6532         dprintk("NFS reply setclientid: %d\n", status);
6533         return status;
6534 }
6535
6536 /**
6537  * nfs4_proc_setclientid_confirm - Confirm client ID
6538  * @clp: state data structure
6539  * @arg: result of a previous SETCLIENTID
6540  * @cred: credential to use for this call
6541  *
6542  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6543  */
6544 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6545                 struct nfs4_setclientid_res *arg,
6546                 const struct cred *cred)
6547 {
6548         struct rpc_message msg = {
6549                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6550                 .rpc_argp = arg,
6551                 .rpc_cred = cred,
6552         };
6553         int status;
6554
6555         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6556                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6557                 clp->cl_clientid);
6558         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6559                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6560         trace_nfs4_setclientid_confirm(clp, status);
6561         dprintk("NFS reply setclientid_confirm: %d\n", status);
6562         return status;
6563 }
6564
6565 struct nfs4_delegreturndata {
6566         struct nfs4_delegreturnargs args;
6567         struct nfs4_delegreturnres res;
6568         struct nfs_fh fh;
6569         nfs4_stateid stateid;
6570         unsigned long timestamp;
6571         struct {
6572                 struct nfs4_layoutreturn_args arg;
6573                 struct nfs4_layoutreturn_res res;
6574                 struct nfs4_xdr_opaque_data ld_private;
6575                 u32 roc_barrier;
6576                 bool roc;
6577         } lr;
6578         struct nfs_fattr fattr;
6579         int rpc_status;
6580         struct inode *inode;
6581 };
6582
6583 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6584 {
6585         struct nfs4_delegreturndata *data = calldata;
6586         struct nfs4_exception exception = {
6587                 .inode = data->inode,
6588                 .stateid = &data->stateid,
6589                 .task_is_privileged = data->args.seq_args.sa_privileged,
6590         };
6591
6592         if (!nfs4_sequence_done(task, &data->res.seq_res))
6593                 return;
6594
6595         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6596
6597         /* Handle Layoutreturn errors */
6598         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6599                           &data->res.lr_ret) == -EAGAIN)
6600                 goto out_restart;
6601
6602         switch (task->tk_status) {
6603         case 0:
6604                 renew_lease(data->res.server, data->timestamp);
6605                 break;
6606         case -NFS4ERR_ADMIN_REVOKED:
6607         case -NFS4ERR_DELEG_REVOKED:
6608         case -NFS4ERR_EXPIRED:
6609                 nfs4_free_revoked_stateid(data->res.server,
6610                                 data->args.stateid,
6611                                 task->tk_msg.rpc_cred);
6612                 fallthrough;
6613         case -NFS4ERR_BAD_STATEID:
6614         case -NFS4ERR_STALE_STATEID:
6615         case -ETIMEDOUT:
6616                 task->tk_status = 0;
6617                 break;
6618         case -NFS4ERR_OLD_STATEID:
6619                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6620                         nfs4_stateid_seqid_inc(&data->stateid);
6621                 if (data->args.bitmask) {
6622                         data->args.bitmask = NULL;
6623                         data->res.fattr = NULL;
6624                 }
6625                 goto out_restart;
6626         case -NFS4ERR_ACCESS:
6627                 if (data->args.bitmask) {
6628                         data->args.bitmask = NULL;
6629                         data->res.fattr = NULL;
6630                         goto out_restart;
6631                 }
6632                 fallthrough;
6633         default:
6634                 task->tk_status = nfs4_async_handle_exception(task,
6635                                 data->res.server, task->tk_status,
6636                                 &exception);
6637                 if (exception.retry)
6638                         goto out_restart;
6639         }
6640         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6641         data->rpc_status = task->tk_status;
6642         return;
6643 out_restart:
6644         task->tk_status = 0;
6645         rpc_restart_call_prepare(task);
6646 }
6647
6648 static void nfs4_delegreturn_release(void *calldata)
6649 {
6650         struct nfs4_delegreturndata *data = calldata;
6651         struct inode *inode = data->inode;
6652
6653         if (data->lr.roc)
6654                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6655                                  data->res.lr_ret);
6656         if (inode) {
6657                 nfs4_fattr_set_prechange(&data->fattr,
6658                                          inode_peek_iversion_raw(inode));
6659                 nfs_refresh_inode(inode, &data->fattr);
6660                 nfs_iput_and_deactive(inode);
6661         }
6662         kfree(calldata);
6663 }
6664
6665 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6666 {
6667         struct nfs4_delegreturndata *d_data;
6668         struct pnfs_layout_hdr *lo;
6669
6670         d_data = data;
6671
6672         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6673                 nfs4_sequence_done(task, &d_data->res.seq_res);
6674                 return;
6675         }
6676
6677         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6678         if (lo && !pnfs_layout_is_valid(lo)) {
6679                 d_data->args.lr_args = NULL;
6680                 d_data->res.lr_res = NULL;
6681         }
6682
6683         nfs4_setup_sequence(d_data->res.server->nfs_client,
6684                         &d_data->args.seq_args,
6685                         &d_data->res.seq_res,
6686                         task);
6687 }
6688
6689 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6690         .rpc_call_prepare = nfs4_delegreturn_prepare,
6691         .rpc_call_done = nfs4_delegreturn_done,
6692         .rpc_release = nfs4_delegreturn_release,
6693 };
6694
6695 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6696 {
6697         struct nfs4_delegreturndata *data;
6698         struct nfs_server *server = NFS_SERVER(inode);
6699         struct rpc_task *task;
6700         struct rpc_message msg = {
6701                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6702                 .rpc_cred = cred,
6703         };
6704         struct rpc_task_setup task_setup_data = {
6705                 .rpc_client = server->client,
6706                 .rpc_message = &msg,
6707                 .callback_ops = &nfs4_delegreturn_ops,
6708                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6709         };
6710         int status = 0;
6711
6712         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6713                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6714
6715         data = kzalloc(sizeof(*data), GFP_KERNEL);
6716         if (data == NULL)
6717                 return -ENOMEM;
6718
6719         nfs4_state_protect(server->nfs_client,
6720                         NFS_SP4_MACH_CRED_CLEANUP,
6721                         &task_setup_data.rpc_client, &msg);
6722
6723         data->args.fhandle = &data->fh;
6724         data->args.stateid = &data->stateid;
6725         nfs4_bitmask_set(data->args.bitmask_store,
6726                          server->cache_consistency_bitmask, inode, 0);
6727         data->args.bitmask = data->args.bitmask_store;
6728         nfs_copy_fh(&data->fh, NFS_FH(inode));
6729         nfs4_stateid_copy(&data->stateid, stateid);
6730         data->res.fattr = &data->fattr;
6731         data->res.server = server;
6732         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6733         data->lr.arg.ld_private = &data->lr.ld_private;
6734         nfs_fattr_init(data->res.fattr);
6735         data->timestamp = jiffies;
6736         data->rpc_status = 0;
6737         data->inode = nfs_igrab_and_active(inode);
6738         if (data->inode || issync) {
6739                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6740                                         cred);
6741                 if (data->lr.roc) {
6742                         data->args.lr_args = &data->lr.arg;
6743                         data->res.lr_res = &data->lr.res;
6744                 }
6745         }
6746
6747         if (!data->inode)
6748                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6749                                    1);
6750         else
6751                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6752                                    0);
6753         task_setup_data.callback_data = data;
6754         msg.rpc_argp = &data->args;
6755         msg.rpc_resp = &data->res;
6756         task = rpc_run_task(&task_setup_data);
6757         if (IS_ERR(task))
6758                 return PTR_ERR(task);
6759         if (!issync)
6760                 goto out;
6761         status = rpc_wait_for_completion_task(task);
6762         if (status != 0)
6763                 goto out;
6764         status = data->rpc_status;
6765 out:
6766         rpc_put_task(task);
6767         return status;
6768 }
6769
6770 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6771 {
6772         struct nfs_server *server = NFS_SERVER(inode);
6773         struct nfs4_exception exception = { };
6774         int err;
6775         do {
6776                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6777                 trace_nfs4_delegreturn(inode, stateid, err);
6778                 switch (err) {
6779                         case -NFS4ERR_STALE_STATEID:
6780                         case -NFS4ERR_EXPIRED:
6781                         case 0:
6782                                 return 0;
6783                 }
6784                 err = nfs4_handle_exception(server, err, &exception);
6785         } while (exception.retry);
6786         return err;
6787 }
6788
6789 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6790 {
6791         struct inode *inode = state->inode;
6792         struct nfs_server *server = NFS_SERVER(inode);
6793         struct nfs_client *clp = server->nfs_client;
6794         struct nfs_lockt_args arg = {
6795                 .fh = NFS_FH(inode),
6796                 .fl = request,
6797         };
6798         struct nfs_lockt_res res = {
6799                 .denied = request,
6800         };
6801         struct rpc_message msg = {
6802                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6803                 .rpc_argp       = &arg,
6804                 .rpc_resp       = &res,
6805                 .rpc_cred       = state->owner->so_cred,
6806         };
6807         struct nfs4_lock_state *lsp;
6808         int status;
6809
6810         arg.lock_owner.clientid = clp->cl_clientid;
6811         status = nfs4_set_lock_state(state, request);
6812         if (status != 0)
6813                 goto out;
6814         lsp = request->fl_u.nfs4_fl.owner;
6815         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6816         arg.lock_owner.s_dev = server->s_dev;
6817         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6818         switch (status) {
6819                 case 0:
6820                         request->c.flc_type = F_UNLCK;
6821                         break;
6822                 case -NFS4ERR_DENIED:
6823                         status = 0;
6824         }
6825         request->fl_ops->fl_release_private(request);
6826         request->fl_ops = NULL;
6827 out:
6828         return status;
6829 }
6830
6831 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6832 {
6833         struct nfs4_exception exception = {
6834                 .interruptible = true,
6835         };
6836         int err;
6837
6838         do {
6839                 err = _nfs4_proc_getlk(state, cmd, request);
6840                 trace_nfs4_get_lock(request, state, cmd, err);
6841                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6842                                 &exception);
6843         } while (exception.retry);
6844         return err;
6845 }
6846
6847 /*
6848  * Update the seqid of a lock stateid after receiving
6849  * NFS4ERR_OLD_STATEID
6850  */
6851 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6852                 struct nfs4_lock_state *lsp)
6853 {
6854         struct nfs4_state *state = lsp->ls_state;
6855         bool ret = false;
6856
6857         spin_lock(&state->state_lock);
6858         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6859                 goto out;
6860         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6861                 nfs4_stateid_seqid_inc(dst);
6862         else
6863                 dst->seqid = lsp->ls_stateid.seqid;
6864         ret = true;
6865 out:
6866         spin_unlock(&state->state_lock);
6867         return ret;
6868 }
6869
6870 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6871                 struct nfs4_lock_state *lsp)
6872 {
6873         struct nfs4_state *state = lsp->ls_state;
6874         bool ret;
6875
6876         spin_lock(&state->state_lock);
6877         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6878         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6879         spin_unlock(&state->state_lock);
6880         return ret;
6881 }
6882
6883 struct nfs4_unlockdata {
6884         struct nfs_locku_args arg;
6885         struct nfs_locku_res res;
6886         struct nfs4_lock_state *lsp;
6887         struct nfs_open_context *ctx;
6888         struct nfs_lock_context *l_ctx;
6889         struct file_lock fl;
6890         struct nfs_server *server;
6891         unsigned long timestamp;
6892 };
6893
6894 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6895                 struct nfs_open_context *ctx,
6896                 struct nfs4_lock_state *lsp,
6897                 struct nfs_seqid *seqid)
6898 {
6899         struct nfs4_unlockdata *p;
6900         struct nfs4_state *state = lsp->ls_state;
6901         struct inode *inode = state->inode;
6902
6903         p = kzalloc(sizeof(*p), GFP_KERNEL);
6904         if (p == NULL)
6905                 return NULL;
6906         p->arg.fh = NFS_FH(inode);
6907         p->arg.fl = &p->fl;
6908         p->arg.seqid = seqid;
6909         p->res.seqid = seqid;
6910         p->lsp = lsp;
6911         /* Ensure we don't close file until we're done freeing locks! */
6912         p->ctx = get_nfs_open_context(ctx);
6913         p->l_ctx = nfs_get_lock_context(ctx);
6914         locks_init_lock(&p->fl);
6915         locks_copy_lock(&p->fl, fl);
6916         p->server = NFS_SERVER(inode);
6917         spin_lock(&state->state_lock);
6918         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6919         spin_unlock(&state->state_lock);
6920         return p;
6921 }
6922
6923 static void nfs4_locku_release_calldata(void *data)
6924 {
6925         struct nfs4_unlockdata *calldata = data;
6926         nfs_free_seqid(calldata->arg.seqid);
6927         nfs4_put_lock_state(calldata->lsp);
6928         nfs_put_lock_context(calldata->l_ctx);
6929         put_nfs_open_context(calldata->ctx);
6930         kfree(calldata);
6931 }
6932
6933 static void nfs4_locku_done(struct rpc_task *task, void *data)
6934 {
6935         struct nfs4_unlockdata *calldata = data;
6936         struct nfs4_exception exception = {
6937                 .inode = calldata->lsp->ls_state->inode,
6938                 .stateid = &calldata->arg.stateid,
6939         };
6940
6941         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6942                 return;
6943         switch (task->tk_status) {
6944                 case 0:
6945                         renew_lease(calldata->server, calldata->timestamp);
6946                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6947                         if (nfs4_update_lock_stateid(calldata->lsp,
6948                                         &calldata->res.stateid))
6949                                 break;
6950                         fallthrough;
6951                 case -NFS4ERR_ADMIN_REVOKED:
6952                 case -NFS4ERR_EXPIRED:
6953                         nfs4_free_revoked_stateid(calldata->server,
6954                                         &calldata->arg.stateid,
6955                                         task->tk_msg.rpc_cred);
6956                         fallthrough;
6957                 case -NFS4ERR_BAD_STATEID:
6958                 case -NFS4ERR_STALE_STATEID:
6959                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6960                                                 calldata->lsp))
6961                                 rpc_restart_call_prepare(task);
6962                         break;
6963                 case -NFS4ERR_OLD_STATEID:
6964                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6965                                                 calldata->lsp))
6966                                 rpc_restart_call_prepare(task);
6967                         break;
6968                 default:
6969                         task->tk_status = nfs4_async_handle_exception(task,
6970                                         calldata->server, task->tk_status,
6971                                         &exception);
6972                         if (exception.retry)
6973                                 rpc_restart_call_prepare(task);
6974         }
6975         nfs_release_seqid(calldata->arg.seqid);
6976 }
6977
6978 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6979 {
6980         struct nfs4_unlockdata *calldata = data;
6981
6982         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6983                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6984                 return;
6985
6986         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6987                 goto out_wait;
6988         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6989                 /* Note: exit _without_ running nfs4_locku_done */
6990                 goto out_no_action;
6991         }
6992         calldata->timestamp = jiffies;
6993         if (nfs4_setup_sequence(calldata->server->nfs_client,
6994                                 &calldata->arg.seq_args,
6995                                 &calldata->res.seq_res,
6996                                 task) != 0)
6997                 nfs_release_seqid(calldata->arg.seqid);
6998         return;
6999 out_no_action:
7000         task->tk_action = NULL;
7001 out_wait:
7002         nfs4_sequence_done(task, &calldata->res.seq_res);
7003 }
7004
7005 static const struct rpc_call_ops nfs4_locku_ops = {
7006         .rpc_call_prepare = nfs4_locku_prepare,
7007         .rpc_call_done = nfs4_locku_done,
7008         .rpc_release = nfs4_locku_release_calldata,
7009 };
7010
7011 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
7012                 struct nfs_open_context *ctx,
7013                 struct nfs4_lock_state *lsp,
7014                 struct nfs_seqid *seqid)
7015 {
7016         struct nfs4_unlockdata *data;
7017         struct rpc_message msg = {
7018                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
7019                 .rpc_cred = ctx->cred,
7020         };
7021         struct rpc_task_setup task_setup_data = {
7022                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
7023                 .rpc_message = &msg,
7024                 .callback_ops = &nfs4_locku_ops,
7025                 .workqueue = nfsiod_workqueue,
7026                 .flags = RPC_TASK_ASYNC,
7027         };
7028
7029         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
7030                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7031
7032         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
7033                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
7034
7035         /* Ensure this is an unlock - when canceling a lock, the
7036          * canceled lock is passed in, and it won't be an unlock.
7037          */
7038         fl->c.flc_type = F_UNLCK;
7039         if (fl->c.flc_flags & FL_CLOSE)
7040                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7041
7042         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7043         if (data == NULL) {
7044                 nfs_free_seqid(seqid);
7045                 return ERR_PTR(-ENOMEM);
7046         }
7047
7048         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7049         msg.rpc_argp = &data->arg;
7050         msg.rpc_resp = &data->res;
7051         task_setup_data.callback_data = data;
7052         return rpc_run_task(&task_setup_data);
7053 }
7054
7055 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7056 {
7057         struct inode *inode = state->inode;
7058         struct nfs4_state_owner *sp = state->owner;
7059         struct nfs_inode *nfsi = NFS_I(inode);
7060         struct nfs_seqid *seqid;
7061         struct nfs4_lock_state *lsp;
7062         struct rpc_task *task;
7063         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7064         int status = 0;
7065         unsigned char saved_flags = request->c.flc_flags;
7066
7067         status = nfs4_set_lock_state(state, request);
7068         /* Unlock _before_ we do the RPC call */
7069         request->c.flc_flags |= FL_EXISTS;
7070         /* Exclude nfs_delegation_claim_locks() */
7071         mutex_lock(&sp->so_delegreturn_mutex);
7072         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7073         down_read(&nfsi->rwsem);
7074         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7075                 up_read(&nfsi->rwsem);
7076                 mutex_unlock(&sp->so_delegreturn_mutex);
7077                 goto out;
7078         }
7079         lsp = request->fl_u.nfs4_fl.owner;
7080         set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7081         up_read(&nfsi->rwsem);
7082         mutex_unlock(&sp->so_delegreturn_mutex);
7083         if (status != 0)
7084                 goto out;
7085         /* Is this a delegated lock? */
7086         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7087                 goto out;
7088         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7089         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7090         status = -ENOMEM;
7091         if (IS_ERR(seqid))
7092                 goto out;
7093         task = nfs4_do_unlck(request,
7094                              nfs_file_open_context(request->c.flc_file),
7095                              lsp, seqid);
7096         status = PTR_ERR(task);
7097         if (IS_ERR(task))
7098                 goto out;
7099         status = rpc_wait_for_completion_task(task);
7100         rpc_put_task(task);
7101 out:
7102         request->c.flc_flags = saved_flags;
7103         trace_nfs4_unlock(request, state, F_SETLK, status);
7104         return status;
7105 }
7106
7107 struct nfs4_lockdata {
7108         struct nfs_lock_args arg;
7109         struct nfs_lock_res res;
7110         struct nfs4_lock_state *lsp;
7111         struct nfs_open_context *ctx;
7112         struct file_lock fl;
7113         unsigned long timestamp;
7114         int rpc_status;
7115         int cancelled;
7116         struct nfs_server *server;
7117 };
7118
7119 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7120                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7121                 gfp_t gfp_mask)
7122 {
7123         struct nfs4_lockdata *p;
7124         struct inode *inode = lsp->ls_state->inode;
7125         struct nfs_server *server = NFS_SERVER(inode);
7126         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7127
7128         p = kzalloc(sizeof(*p), gfp_mask);
7129         if (p == NULL)
7130                 return NULL;
7131
7132         p->arg.fh = NFS_FH(inode);
7133         p->arg.fl = &p->fl;
7134         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7135         if (IS_ERR(p->arg.open_seqid))
7136                 goto out_free;
7137         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7138         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7139         if (IS_ERR(p->arg.lock_seqid))
7140                 goto out_free_seqid;
7141         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7142         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7143         p->arg.lock_owner.s_dev = server->s_dev;
7144         p->res.lock_seqid = p->arg.lock_seqid;
7145         p->lsp = lsp;
7146         p->server = server;
7147         p->ctx = get_nfs_open_context(ctx);
7148         locks_init_lock(&p->fl);
7149         locks_copy_lock(&p->fl, fl);
7150         return p;
7151 out_free_seqid:
7152         nfs_free_seqid(p->arg.open_seqid);
7153 out_free:
7154         kfree(p);
7155         return NULL;
7156 }
7157
7158 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7159 {
7160         struct nfs4_lockdata *data = calldata;
7161         struct nfs4_state *state = data->lsp->ls_state;
7162
7163         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7164                 goto out_wait;
7165         /* Do we need to do an open_to_lock_owner? */
7166         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7167                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7168                         goto out_release_lock_seqid;
7169                 }
7170                 nfs4_stateid_copy(&data->arg.open_stateid,
7171                                 &state->open_stateid);
7172                 data->arg.new_lock_owner = 1;
7173                 data->res.open_seqid = data->arg.open_seqid;
7174         } else {
7175                 data->arg.new_lock_owner = 0;
7176                 nfs4_stateid_copy(&data->arg.lock_stateid,
7177                                 &data->lsp->ls_stateid);
7178         }
7179         if (!nfs4_valid_open_stateid(state)) {
7180                 data->rpc_status = -EBADF;
7181                 task->tk_action = NULL;
7182                 goto out_release_open_seqid;
7183         }
7184         data->timestamp = jiffies;
7185         if (nfs4_setup_sequence(data->server->nfs_client,
7186                                 &data->arg.seq_args,
7187                                 &data->res.seq_res,
7188                                 task) == 0)
7189                 return;
7190 out_release_open_seqid:
7191         nfs_release_seqid(data->arg.open_seqid);
7192 out_release_lock_seqid:
7193         nfs_release_seqid(data->arg.lock_seqid);
7194 out_wait:
7195         nfs4_sequence_done(task, &data->res.seq_res);
7196         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7197 }
7198
7199 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7200 {
7201         struct nfs4_lockdata *data = calldata;
7202         struct nfs4_lock_state *lsp = data->lsp;
7203
7204         if (!nfs4_sequence_done(task, &data->res.seq_res))
7205                 return;
7206
7207         data->rpc_status = task->tk_status;
7208         switch (task->tk_status) {
7209         case 0:
7210                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7211                                 data->timestamp);
7212                 if (data->arg.new_lock && !data->cancelled) {
7213                         data->fl.c.flc_flags &= ~(FL_SLEEP | FL_ACCESS);
7214                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7215                                 goto out_restart;
7216                 }
7217                 if (data->arg.new_lock_owner != 0) {
7218                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7219                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7220                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7221                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7222                         goto out_restart;
7223                 break;
7224         case -NFS4ERR_OLD_STATEID:
7225                 if (data->arg.new_lock_owner != 0 &&
7226                         nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7227                                         lsp->ls_state))
7228                         goto out_restart;
7229                 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7230                         goto out_restart;
7231                 fallthrough;
7232         case -NFS4ERR_BAD_STATEID:
7233         case -NFS4ERR_STALE_STATEID:
7234         case -NFS4ERR_EXPIRED:
7235                 if (data->arg.new_lock_owner != 0) {
7236                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7237                                                 &lsp->ls_state->open_stateid))
7238                                 goto out_restart;
7239                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7240                                                 &lsp->ls_stateid))
7241                                 goto out_restart;
7242         }
7243 out_done:
7244         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7245         return;
7246 out_restart:
7247         if (!data->cancelled)
7248                 rpc_restart_call_prepare(task);
7249         goto out_done;
7250 }
7251
7252 static void nfs4_lock_release(void *calldata)
7253 {
7254         struct nfs4_lockdata *data = calldata;
7255
7256         nfs_free_seqid(data->arg.open_seqid);
7257         if (data->cancelled && data->rpc_status == 0) {
7258                 struct rpc_task *task;
7259                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7260                                 data->arg.lock_seqid);
7261                 if (!IS_ERR(task))
7262                         rpc_put_task_async(task);
7263                 dprintk("%s: cancelling lock!\n", __func__);
7264         } else
7265                 nfs_free_seqid(data->arg.lock_seqid);
7266         nfs4_put_lock_state(data->lsp);
7267         put_nfs_open_context(data->ctx);
7268         kfree(data);
7269 }
7270
7271 static const struct rpc_call_ops nfs4_lock_ops = {
7272         .rpc_call_prepare = nfs4_lock_prepare,
7273         .rpc_call_done = nfs4_lock_done,
7274         .rpc_release = nfs4_lock_release,
7275 };
7276
7277 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7278 {
7279         switch (error) {
7280         case -NFS4ERR_ADMIN_REVOKED:
7281         case -NFS4ERR_EXPIRED:
7282         case -NFS4ERR_BAD_STATEID:
7283                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7284                 if (new_lock_owner != 0 ||
7285                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7286                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7287                 break;
7288         case -NFS4ERR_STALE_STATEID:
7289                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7290                 nfs4_schedule_lease_recovery(server->nfs_client);
7291         }
7292 }
7293
7294 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7295 {
7296         struct nfs4_lockdata *data;
7297         struct rpc_task *task;
7298         struct rpc_message msg = {
7299                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7300                 .rpc_cred = state->owner->so_cred,
7301         };
7302         struct rpc_task_setup task_setup_data = {
7303                 .rpc_client = NFS_CLIENT(state->inode),
7304                 .rpc_message = &msg,
7305                 .callback_ops = &nfs4_lock_ops,
7306                 .workqueue = nfsiod_workqueue,
7307                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7308         };
7309         int ret;
7310
7311         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7312                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7313
7314         data = nfs4_alloc_lockdata(fl,
7315                                    nfs_file_open_context(fl->c.flc_file),
7316                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7317         if (data == NULL)
7318                 return -ENOMEM;
7319         if (IS_SETLKW(cmd))
7320                 data->arg.block = 1;
7321         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7322                                 recovery_type > NFS_LOCK_NEW);
7323         msg.rpc_argp = &data->arg;
7324         msg.rpc_resp = &data->res;
7325         task_setup_data.callback_data = data;
7326         if (recovery_type > NFS_LOCK_NEW) {
7327                 if (recovery_type == NFS_LOCK_RECLAIM)
7328                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7329         } else
7330                 data->arg.new_lock = 1;
7331         task = rpc_run_task(&task_setup_data);
7332         if (IS_ERR(task))
7333                 return PTR_ERR(task);
7334         ret = rpc_wait_for_completion_task(task);
7335         if (ret == 0) {
7336                 ret = data->rpc_status;
7337                 if (ret)
7338                         nfs4_handle_setlk_error(data->server, data->lsp,
7339                                         data->arg.new_lock_owner, ret);
7340         } else
7341                 data->cancelled = true;
7342         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7343         rpc_put_task(task);
7344         dprintk("%s: ret = %d\n", __func__, ret);
7345         return ret;
7346 }
7347
7348 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7349 {
7350         struct nfs_server *server = NFS_SERVER(state->inode);
7351         struct nfs4_exception exception = {
7352                 .inode = state->inode,
7353         };
7354         int err;
7355
7356         do {
7357                 /* Cache the lock if possible... */
7358                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7359                         return 0;
7360                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7361                 if (err != -NFS4ERR_DELAY)
7362                         break;
7363                 nfs4_handle_exception(server, err, &exception);
7364         } while (exception.retry);
7365         return err;
7366 }
7367
7368 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7369 {
7370         struct nfs_server *server = NFS_SERVER(state->inode);
7371         struct nfs4_exception exception = {
7372                 .inode = state->inode,
7373         };
7374         int err;
7375
7376         err = nfs4_set_lock_state(state, request);
7377         if (err != 0)
7378                 return err;
7379         if (!recover_lost_locks) {
7380                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7381                 return 0;
7382         }
7383         do {
7384                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7385                         return 0;
7386                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7387                 switch (err) {
7388                 default:
7389                         goto out;
7390                 case -NFS4ERR_GRACE:
7391                 case -NFS4ERR_DELAY:
7392                         nfs4_handle_exception(server, err, &exception);
7393                         err = 0;
7394                 }
7395         } while (exception.retry);
7396 out:
7397         return err;
7398 }
7399
7400 #if defined(CONFIG_NFS_V4_1)
7401 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7402 {
7403         struct nfs4_lock_state *lsp;
7404         int status;
7405
7406         status = nfs4_set_lock_state(state, request);
7407         if (status != 0)
7408                 return status;
7409         lsp = request->fl_u.nfs4_fl.owner;
7410         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7411             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7412                 return 0;
7413         return nfs4_lock_expired(state, request);
7414 }
7415 #endif
7416
7417 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7418 {
7419         struct nfs_inode *nfsi = NFS_I(state->inode);
7420         struct nfs4_state_owner *sp = state->owner;
7421         unsigned char flags = request->c.flc_flags;
7422         int status;
7423
7424         request->c.flc_flags |= FL_ACCESS;
7425         status = locks_lock_inode_wait(state->inode, request);
7426         if (status < 0)
7427                 goto out;
7428         mutex_lock(&sp->so_delegreturn_mutex);
7429         down_read(&nfsi->rwsem);
7430         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7431                 /* Yes: cache locks! */
7432                 /* ...but avoid races with delegation recall... */
7433                 request->c.flc_flags = flags & ~FL_SLEEP;
7434                 status = locks_lock_inode_wait(state->inode, request);
7435                 up_read(&nfsi->rwsem);
7436                 mutex_unlock(&sp->so_delegreturn_mutex);
7437                 goto out;
7438         }
7439         up_read(&nfsi->rwsem);
7440         mutex_unlock(&sp->so_delegreturn_mutex);
7441         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7442 out:
7443         request->c.flc_flags = flags;
7444         return status;
7445 }
7446
7447 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7448 {
7449         struct nfs4_exception exception = {
7450                 .state = state,
7451                 .inode = state->inode,
7452                 .interruptible = true,
7453         };
7454         int err;
7455
7456         do {
7457                 err = _nfs4_proc_setlk(state, cmd, request);
7458                 if (err == -NFS4ERR_DENIED)
7459                         err = -EAGAIN;
7460                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7461                                 err, &exception);
7462         } while (exception.retry);
7463         return err;
7464 }
7465
7466 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7467 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7468
7469 static int
7470 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7471                         struct file_lock *request)
7472 {
7473         int             status = -ERESTARTSYS;
7474         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7475
7476         while(!signalled()) {
7477                 status = nfs4_proc_setlk(state, cmd, request);
7478                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7479                         break;
7480                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7481                 schedule_timeout(timeout);
7482                 timeout *= 2;
7483                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7484                 status = -ERESTARTSYS;
7485         }
7486         return status;
7487 }
7488
7489 #ifdef CONFIG_NFS_V4_1
7490 struct nfs4_lock_waiter {
7491         struct inode            *inode;
7492         struct nfs_lowner       owner;
7493         wait_queue_entry_t      wait;
7494 };
7495
7496 static int
7497 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7498 {
7499         struct nfs4_lock_waiter *waiter =
7500                 container_of(wait, struct nfs4_lock_waiter, wait);
7501
7502         /* NULL key means to wake up everyone */
7503         if (key) {
7504                 struct cb_notify_lock_args      *cbnl = key;
7505                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7506                                                 *wowner = &waiter->owner;
7507
7508                 /* Only wake if the callback was for the same owner. */
7509                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7510                         return 0;
7511
7512                 /* Make sure it's for the right inode */
7513                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7514                         return 0;
7515         }
7516
7517         return woken_wake_function(wait, mode, flags, key);
7518 }
7519
7520 static int
7521 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7522 {
7523         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7524         struct nfs_server *server = NFS_SERVER(state->inode);
7525         struct nfs_client *clp = server->nfs_client;
7526         wait_queue_head_t *q = &clp->cl_lock_waitq;
7527         struct nfs4_lock_waiter waiter = {
7528                 .inode = state->inode,
7529                 .owner = { .clientid = clp->cl_clientid,
7530                            .id = lsp->ls_seqid.owner_id,
7531                            .s_dev = server->s_dev },
7532         };
7533         int status;
7534
7535         /* Don't bother with waitqueue if we don't expect a callback */
7536         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7537                 return nfs4_retry_setlk_simple(state, cmd, request);
7538
7539         init_wait(&waiter.wait);
7540         waiter.wait.func = nfs4_wake_lock_waiter;
7541         add_wait_queue(q, &waiter.wait);
7542
7543         do {
7544                 status = nfs4_proc_setlk(state, cmd, request);
7545                 if (status != -EAGAIN || IS_SETLK(cmd))
7546                         break;
7547
7548                 status = -ERESTARTSYS;
7549                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7550                            NFS4_LOCK_MAXTIMEOUT);
7551         } while (!signalled());
7552
7553         remove_wait_queue(q, &waiter.wait);
7554
7555         return status;
7556 }
7557 #else /* !CONFIG_NFS_V4_1 */
7558 static inline int
7559 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7560 {
7561         return nfs4_retry_setlk_simple(state, cmd, request);
7562 }
7563 #endif
7564
7565 static int
7566 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7567 {
7568         struct nfs_open_context *ctx;
7569         struct nfs4_state *state;
7570         int status;
7571
7572         /* verify open state */
7573         ctx = nfs_file_open_context(filp);
7574         state = ctx->state;
7575
7576         if (IS_GETLK(cmd)) {
7577                 if (state != NULL)
7578                         return nfs4_proc_getlk(state, F_GETLK, request);
7579                 return 0;
7580         }
7581
7582         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7583                 return -EINVAL;
7584
7585         if (lock_is_unlock(request)) {
7586                 if (state != NULL)
7587                         return nfs4_proc_unlck(state, cmd, request);
7588                 return 0;
7589         }
7590
7591         if (state == NULL)
7592                 return -ENOLCK;
7593
7594         if ((request->c.flc_flags & FL_POSIX) &&
7595             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7596                 return -ENOLCK;
7597
7598         /*
7599          * Don't rely on the VFS having checked the file open mode,
7600          * since it won't do this for flock() locks.
7601          */
7602         switch (request->c.flc_type) {
7603         case F_RDLCK:
7604                 if (!(filp->f_mode & FMODE_READ))
7605                         return -EBADF;
7606                 break;
7607         case F_WRLCK:
7608                 if (!(filp->f_mode & FMODE_WRITE))
7609                         return -EBADF;
7610         }
7611
7612         status = nfs4_set_lock_state(state, request);
7613         if (status != 0)
7614                 return status;
7615
7616         return nfs4_retry_setlk(state, cmd, request);
7617 }
7618
7619 static int nfs4_delete_lease(struct file *file, void **priv)
7620 {
7621         return generic_setlease(file, F_UNLCK, NULL, priv);
7622 }
7623
7624 static int nfs4_add_lease(struct file *file, int arg, struct file_lease **lease,
7625                           void **priv)
7626 {
7627         struct inode *inode = file_inode(file);
7628         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7629         int ret;
7630
7631         /* No delegation, no lease */
7632         if (!nfs4_have_delegation(inode, type))
7633                 return -EAGAIN;
7634         ret = generic_setlease(file, arg, lease, priv);
7635         if (ret || nfs4_have_delegation(inode, type))
7636                 return ret;
7637         /* We raced with a delegation return */
7638         nfs4_delete_lease(file, priv);
7639         return -EAGAIN;
7640 }
7641
7642 int nfs4_proc_setlease(struct file *file, int arg, struct file_lease **lease,
7643                        void **priv)
7644 {
7645         switch (arg) {
7646         case F_RDLCK:
7647         case F_WRLCK:
7648                 return nfs4_add_lease(file, arg, lease, priv);
7649         case F_UNLCK:
7650                 return nfs4_delete_lease(file, priv);
7651         default:
7652                 return -EINVAL;
7653         }
7654 }
7655
7656 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7657 {
7658         struct nfs_server *server = NFS_SERVER(state->inode);
7659         int err;
7660
7661         err = nfs4_set_lock_state(state, fl);
7662         if (err != 0)
7663                 return err;
7664         do {
7665                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7666                 if (err != -NFS4ERR_DELAY)
7667                         break;
7668                 ssleep(1);
7669         } while (err == -NFS4ERR_DELAY);
7670         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7671 }
7672
7673 struct nfs_release_lockowner_data {
7674         struct nfs4_lock_state *lsp;
7675         struct nfs_server *server;
7676         struct nfs_release_lockowner_args args;
7677         struct nfs_release_lockowner_res res;
7678         unsigned long timestamp;
7679 };
7680
7681 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7682 {
7683         struct nfs_release_lockowner_data *data = calldata;
7684         struct nfs_server *server = data->server;
7685         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7686                            &data->res.seq_res, task);
7687         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7688         data->timestamp = jiffies;
7689 }
7690
7691 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7692 {
7693         struct nfs_release_lockowner_data *data = calldata;
7694         struct nfs_server *server = data->server;
7695
7696         nfs40_sequence_done(task, &data->res.seq_res);
7697
7698         switch (task->tk_status) {
7699         case 0:
7700                 renew_lease(server, data->timestamp);
7701                 break;
7702         case -NFS4ERR_STALE_CLIENTID:
7703         case -NFS4ERR_EXPIRED:
7704                 nfs4_schedule_lease_recovery(server->nfs_client);
7705                 break;
7706         case -NFS4ERR_LEASE_MOVED:
7707         case -NFS4ERR_DELAY:
7708                 if (nfs4_async_handle_error(task, server,
7709                                             NULL, NULL) == -EAGAIN)
7710                         rpc_restart_call_prepare(task);
7711         }
7712 }
7713
7714 static void nfs4_release_lockowner_release(void *calldata)
7715 {
7716         struct nfs_release_lockowner_data *data = calldata;
7717         nfs4_free_lock_state(data->server, data->lsp);
7718         kfree(calldata);
7719 }
7720
7721 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7722         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7723         .rpc_call_done = nfs4_release_lockowner_done,
7724         .rpc_release = nfs4_release_lockowner_release,
7725 };
7726
7727 static void
7728 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7729 {
7730         struct nfs_release_lockowner_data *data;
7731         struct rpc_message msg = {
7732                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7733         };
7734
7735         if (server->nfs_client->cl_mvops->minor_version != 0)
7736                 return;
7737
7738         data = kmalloc(sizeof(*data), GFP_KERNEL);
7739         if (!data)
7740                 return;
7741         data->lsp = lsp;
7742         data->server = server;
7743         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7744         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7745         data->args.lock_owner.s_dev = server->s_dev;
7746
7747         msg.rpc_argp = &data->args;
7748         msg.rpc_resp = &data->res;
7749         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7750         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7751 }
7752
7753 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7754
7755 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7756                                    struct mnt_idmap *idmap,
7757                                    struct dentry *unused, struct inode *inode,
7758                                    const char *key, const void *buf,
7759                                    size_t buflen, int flags)
7760 {
7761         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7762 }
7763
7764 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7765                                    struct dentry *unused, struct inode *inode,
7766                                    const char *key, void *buf, size_t buflen)
7767 {
7768         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7769 }
7770
7771 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7772 {
7773         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7774 }
7775
7776 #if defined(CONFIG_NFS_V4_1)
7777 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7778
7779 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7780                                     struct mnt_idmap *idmap,
7781                                     struct dentry *unused, struct inode *inode,
7782                                     const char *key, const void *buf,
7783                                     size_t buflen, int flags)
7784 {
7785         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7786 }
7787
7788 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7789                                     struct dentry *unused, struct inode *inode,
7790                                     const char *key, void *buf, size_t buflen)
7791 {
7792         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7793 }
7794
7795 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7796 {
7797         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7798 }
7799
7800 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7801
7802 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7803                                     struct mnt_idmap *idmap,
7804                                     struct dentry *unused, struct inode *inode,
7805                                     const char *key, const void *buf,
7806                                     size_t buflen, int flags)
7807 {
7808         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7809 }
7810
7811 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7812                                     struct dentry *unused, struct inode *inode,
7813                                     const char *key, void *buf, size_t buflen)
7814 {
7815         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7816 }
7817
7818 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7819 {
7820         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7821 }
7822
7823 #endif
7824
7825 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7826
7827 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7828                                      struct mnt_idmap *idmap,
7829                                      struct dentry *unused, struct inode *inode,
7830                                      const char *key, const void *buf,
7831                                      size_t buflen, int flags)
7832 {
7833         if (security_ismaclabel(key))
7834                 return nfs4_set_security_label(inode, buf, buflen);
7835
7836         return -EOPNOTSUPP;
7837 }
7838
7839 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7840                                      struct dentry *unused, struct inode *inode,
7841                                      const char *key, void *buf, size_t buflen)
7842 {
7843         if (security_ismaclabel(key))
7844                 return nfs4_get_security_label(inode, buf, buflen);
7845         return -EOPNOTSUPP;
7846 }
7847
7848 static ssize_t
7849 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7850 {
7851         int len = 0;
7852
7853         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7854                 len = security_inode_listsecurity(inode, list, list_len);
7855                 if (len >= 0 && list_len && len > list_len)
7856                         return -ERANGE;
7857         }
7858         return len;
7859 }
7860
7861 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7862         .prefix = XATTR_SECURITY_PREFIX,
7863         .get    = nfs4_xattr_get_nfs4_label,
7864         .set    = nfs4_xattr_set_nfs4_label,
7865 };
7866
7867 #else
7868
7869 static ssize_t
7870 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7871 {
7872         return 0;
7873 }
7874
7875 #endif
7876
7877 #ifdef CONFIG_NFS_V4_2
7878 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7879                                     struct mnt_idmap *idmap,
7880                                     struct dentry *unused, struct inode *inode,
7881                                     const char *key, const void *buf,
7882                                     size_t buflen, int flags)
7883 {
7884         u32 mask;
7885         int ret;
7886
7887         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7888                 return -EOPNOTSUPP;
7889
7890         /*
7891          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7892          * flags right now. Handling of xattr operations use the normal
7893          * file read/write permissions.
7894          *
7895          * Just in case the server has other ideas (which RFC 8276 allows),
7896          * do a cached access check for the XA* flags to possibly avoid
7897          * doing an RPC and getting EACCES back.
7898          */
7899         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7900                 if (!(mask & NFS_ACCESS_XAWRITE))
7901                         return -EACCES;
7902         }
7903
7904         if (buf == NULL) {
7905                 ret = nfs42_proc_removexattr(inode, key);
7906                 if (!ret)
7907                         nfs4_xattr_cache_remove(inode, key);
7908         } else {
7909                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7910                 if (!ret)
7911                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7912         }
7913
7914         return ret;
7915 }
7916
7917 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7918                                     struct dentry *unused, struct inode *inode,
7919                                     const char *key, void *buf, size_t buflen)
7920 {
7921         u32 mask;
7922         ssize_t ret;
7923
7924         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7925                 return -EOPNOTSUPP;
7926
7927         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7928                 if (!(mask & NFS_ACCESS_XAREAD))
7929                         return -EACCES;
7930         }
7931
7932         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7933         if (ret)
7934                 return ret;
7935
7936         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7937         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7938                 return ret;
7939
7940         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7941
7942         return ret;
7943 }
7944
7945 static ssize_t
7946 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7947 {
7948         u64 cookie;
7949         bool eof;
7950         ssize_t ret, size;
7951         char *buf;
7952         size_t buflen;
7953         u32 mask;
7954
7955         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7956                 return 0;
7957
7958         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7959                 if (!(mask & NFS_ACCESS_XALIST))
7960                         return 0;
7961         }
7962
7963         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7964         if (ret)
7965                 return ret;
7966
7967         ret = nfs4_xattr_cache_list(inode, list, list_len);
7968         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7969                 return ret;
7970
7971         cookie = 0;
7972         eof = false;
7973         buflen = list_len ? list_len : XATTR_LIST_MAX;
7974         buf = list_len ? list : NULL;
7975         size = 0;
7976
7977         while (!eof) {
7978                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7979                     &cookie, &eof);
7980                 if (ret < 0)
7981                         return ret;
7982
7983                 if (list_len) {
7984                         buf += ret;
7985                         buflen -= ret;
7986                 }
7987                 size += ret;
7988         }
7989
7990         if (list_len)
7991                 nfs4_xattr_cache_set_list(inode, list, size);
7992
7993         return size;
7994 }
7995
7996 #else
7997
7998 static ssize_t
7999 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
8000 {
8001         return 0;
8002 }
8003 #endif /* CONFIG_NFS_V4_2 */
8004
8005 /*
8006  * nfs_fhget will use either the mounted_on_fileid or the fileid
8007  */
8008 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
8009 {
8010         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
8011                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
8012               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
8013               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
8014                 return;
8015
8016         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
8017                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
8018         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
8019         fattr->nlink = 2;
8020 }
8021
8022 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8023                                    const struct qstr *name,
8024                                    struct nfs4_fs_locations *fs_locations,
8025                                    struct page *page)
8026 {
8027         struct nfs_server *server = NFS_SERVER(dir);
8028         u32 bitmask[3];
8029         struct nfs4_fs_locations_arg args = {
8030                 .dir_fh = NFS_FH(dir),
8031                 .name = name,
8032                 .page = page,
8033                 .bitmask = bitmask,
8034         };
8035         struct nfs4_fs_locations_res res = {
8036                 .fs_locations = fs_locations,
8037         };
8038         struct rpc_message msg = {
8039                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8040                 .rpc_argp = &args,
8041                 .rpc_resp = &res,
8042         };
8043         int status;
8044
8045         dprintk("%s: start\n", __func__);
8046
8047         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8048         bitmask[1] = nfs4_fattr_bitmap[1];
8049
8050         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8051          * is not supported */
8052         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8053                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8054         else
8055                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8056
8057         nfs_fattr_init(fs_locations->fattr);
8058         fs_locations->server = server;
8059         fs_locations->nlocations = 0;
8060         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8061         dprintk("%s: returned status = %d\n", __func__, status);
8062         return status;
8063 }
8064
8065 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8066                            const struct qstr *name,
8067                            struct nfs4_fs_locations *fs_locations,
8068                            struct page *page)
8069 {
8070         struct nfs4_exception exception = {
8071                 .interruptible = true,
8072         };
8073         int err;
8074         do {
8075                 err = _nfs4_proc_fs_locations(client, dir, name,
8076                                 fs_locations, page);
8077                 trace_nfs4_get_fs_locations(dir, name, err);
8078                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8079                                 &exception);
8080         } while (exception.retry);
8081         return err;
8082 }
8083
8084 /*
8085  * This operation also signals the server that this client is
8086  * performing migration recovery.  The server can stop returning
8087  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8088  * appended to this compound to identify the client ID which is
8089  * performing recovery.
8090  */
8091 static int _nfs40_proc_get_locations(struct nfs_server *server,
8092                                      struct nfs_fh *fhandle,
8093                                      struct nfs4_fs_locations *locations,
8094                                      struct page *page, const struct cred *cred)
8095 {
8096         struct rpc_clnt *clnt = server->client;
8097         u32 bitmask[2] = {
8098                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8099         };
8100         struct nfs4_fs_locations_arg args = {
8101                 .clientid       = server->nfs_client->cl_clientid,
8102                 .fh             = fhandle,
8103                 .page           = page,
8104                 .bitmask        = bitmask,
8105                 .migration      = 1,            /* skip LOOKUP */
8106                 .renew          = 1,            /* append RENEW */
8107         };
8108         struct nfs4_fs_locations_res res = {
8109                 .fs_locations   = locations,
8110                 .migration      = 1,
8111                 .renew          = 1,
8112         };
8113         struct rpc_message msg = {
8114                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8115                 .rpc_argp       = &args,
8116                 .rpc_resp       = &res,
8117                 .rpc_cred       = cred,
8118         };
8119         unsigned long now = jiffies;
8120         int status;
8121
8122         nfs_fattr_init(locations->fattr);
8123         locations->server = server;
8124         locations->nlocations = 0;
8125
8126         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8127         status = nfs4_call_sync_sequence(clnt, server, &msg,
8128                                         &args.seq_args, &res.seq_res);
8129         if (status)
8130                 return status;
8131
8132         renew_lease(server, now);
8133         return 0;
8134 }
8135
8136 #ifdef CONFIG_NFS_V4_1
8137
8138 /*
8139  * This operation also signals the server that this client is
8140  * performing migration recovery.  The server can stop asserting
8141  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8142  * performing this operation is identified in the SEQUENCE
8143  * operation in this compound.
8144  *
8145  * When the client supports GETATTR(fs_locations_info), it can
8146  * be plumbed in here.
8147  */
8148 static int _nfs41_proc_get_locations(struct nfs_server *server,
8149                                      struct nfs_fh *fhandle,
8150                                      struct nfs4_fs_locations *locations,
8151                                      struct page *page, const struct cred *cred)
8152 {
8153         struct rpc_clnt *clnt = server->client;
8154         u32 bitmask[2] = {
8155                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8156         };
8157         struct nfs4_fs_locations_arg args = {
8158                 .fh             = fhandle,
8159                 .page           = page,
8160                 .bitmask        = bitmask,
8161                 .migration      = 1,            /* skip LOOKUP */
8162         };
8163         struct nfs4_fs_locations_res res = {
8164                 .fs_locations   = locations,
8165                 .migration      = 1,
8166         };
8167         struct rpc_message msg = {
8168                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8169                 .rpc_argp       = &args,
8170                 .rpc_resp       = &res,
8171                 .rpc_cred       = cred,
8172         };
8173         struct nfs4_call_sync_data data = {
8174                 .seq_server = server,
8175                 .seq_args = &args.seq_args,
8176                 .seq_res = &res.seq_res,
8177         };
8178         struct rpc_task_setup task_setup_data = {
8179                 .rpc_client = clnt,
8180                 .rpc_message = &msg,
8181                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8182                 .callback_data = &data,
8183                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8184         };
8185         int status;
8186
8187         nfs_fattr_init(locations->fattr);
8188         locations->server = server;
8189         locations->nlocations = 0;
8190
8191         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8192         status = nfs4_call_sync_custom(&task_setup_data);
8193         if (status == NFS4_OK &&
8194             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8195                 status = -NFS4ERR_LEASE_MOVED;
8196         return status;
8197 }
8198
8199 #endif  /* CONFIG_NFS_V4_1 */
8200
8201 /**
8202  * nfs4_proc_get_locations - discover locations for a migrated FSID
8203  * @server: pointer to nfs_server to process
8204  * @fhandle: pointer to the kernel NFS client file handle
8205  * @locations: result of query
8206  * @page: buffer
8207  * @cred: credential to use for this operation
8208  *
8209  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8210  * operation failed, or a negative errno if a local error occurred.
8211  *
8212  * On success, "locations" is filled in, but if the server has
8213  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8214  * asserted.
8215  *
8216  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8217  * from this client that require migration recovery.
8218  */
8219 int nfs4_proc_get_locations(struct nfs_server *server,
8220                             struct nfs_fh *fhandle,
8221                             struct nfs4_fs_locations *locations,
8222                             struct page *page, const struct cred *cred)
8223 {
8224         struct nfs_client *clp = server->nfs_client;
8225         const struct nfs4_mig_recovery_ops *ops =
8226                                         clp->cl_mvops->mig_recovery_ops;
8227         struct nfs4_exception exception = {
8228                 .interruptible = true,
8229         };
8230         int status;
8231
8232         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8233                 (unsigned long long)server->fsid.major,
8234                 (unsigned long long)server->fsid.minor,
8235                 clp->cl_hostname);
8236         nfs_display_fhandle(fhandle, __func__);
8237
8238         do {
8239                 status = ops->get_locations(server, fhandle, locations, page,
8240                                             cred);
8241                 if (status != -NFS4ERR_DELAY)
8242                         break;
8243                 nfs4_handle_exception(server, status, &exception);
8244         } while (exception.retry);
8245         return status;
8246 }
8247
8248 /*
8249  * This operation also signals the server that this client is
8250  * performing "lease moved" recovery.  The server can stop
8251  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8252  * is appended to this compound to identify the client ID which is
8253  * performing recovery.
8254  */
8255 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8256 {
8257         struct nfs_server *server = NFS_SERVER(inode);
8258         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8259         struct rpc_clnt *clnt = server->client;
8260         struct nfs4_fsid_present_arg args = {
8261                 .fh             = NFS_FH(inode),
8262                 .clientid       = clp->cl_clientid,
8263                 .renew          = 1,            /* append RENEW */
8264         };
8265         struct nfs4_fsid_present_res res = {
8266                 .renew          = 1,
8267         };
8268         struct rpc_message msg = {
8269                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8270                 .rpc_argp       = &args,
8271                 .rpc_resp       = &res,
8272                 .rpc_cred       = cred,
8273         };
8274         unsigned long now = jiffies;
8275         int status;
8276
8277         res.fh = nfs_alloc_fhandle();
8278         if (res.fh == NULL)
8279                 return -ENOMEM;
8280
8281         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8282         status = nfs4_call_sync_sequence(clnt, server, &msg,
8283                                                 &args.seq_args, &res.seq_res);
8284         nfs_free_fhandle(res.fh);
8285         if (status)
8286                 return status;
8287
8288         do_renew_lease(clp, now);
8289         return 0;
8290 }
8291
8292 #ifdef CONFIG_NFS_V4_1
8293
8294 /*
8295  * This operation also signals the server that this client is
8296  * performing "lease moved" recovery.  The server can stop asserting
8297  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8298  * this operation is identified in the SEQUENCE operation in this
8299  * compound.
8300  */
8301 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8302 {
8303         struct nfs_server *server = NFS_SERVER(inode);
8304         struct rpc_clnt *clnt = server->client;
8305         struct nfs4_fsid_present_arg args = {
8306                 .fh             = NFS_FH(inode),
8307         };
8308         struct nfs4_fsid_present_res res = {
8309         };
8310         struct rpc_message msg = {
8311                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8312                 .rpc_argp       = &args,
8313                 .rpc_resp       = &res,
8314                 .rpc_cred       = cred,
8315         };
8316         int status;
8317
8318         res.fh = nfs_alloc_fhandle();
8319         if (res.fh == NULL)
8320                 return -ENOMEM;
8321
8322         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8323         status = nfs4_call_sync_sequence(clnt, server, &msg,
8324                                                 &args.seq_args, &res.seq_res);
8325         nfs_free_fhandle(res.fh);
8326         if (status == NFS4_OK &&
8327             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8328                 status = -NFS4ERR_LEASE_MOVED;
8329         return status;
8330 }
8331
8332 #endif  /* CONFIG_NFS_V4_1 */
8333
8334 /**
8335  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8336  * @inode: inode on FSID to check
8337  * @cred: credential to use for this operation
8338  *
8339  * Server indicates whether the FSID is present, moved, or not
8340  * recognized.  This operation is necessary to clear a LEASE_MOVED
8341  * condition for this client ID.
8342  *
8343  * Returns NFS4_OK if the FSID is present on this server,
8344  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8345  *  NFS4ERR code if some error occurred on the server, or a
8346  *  negative errno if a local failure occurred.
8347  */
8348 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8349 {
8350         struct nfs_server *server = NFS_SERVER(inode);
8351         struct nfs_client *clp = server->nfs_client;
8352         const struct nfs4_mig_recovery_ops *ops =
8353                                         clp->cl_mvops->mig_recovery_ops;
8354         struct nfs4_exception exception = {
8355                 .interruptible = true,
8356         };
8357         int status;
8358
8359         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8360                 (unsigned long long)server->fsid.major,
8361                 (unsigned long long)server->fsid.minor,
8362                 clp->cl_hostname);
8363         nfs_display_fhandle(NFS_FH(inode), __func__);
8364
8365         do {
8366                 status = ops->fsid_present(inode, cred);
8367                 if (status != -NFS4ERR_DELAY)
8368                         break;
8369                 nfs4_handle_exception(server, status, &exception);
8370         } while (exception.retry);
8371         return status;
8372 }
8373
8374 /*
8375  * If 'use_integrity' is true and the state managment nfs_client
8376  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8377  * and the machine credential as per RFC3530bis and RFC5661 Security
8378  * Considerations sections. Otherwise, just use the user cred with the
8379  * filesystem's rpc_client.
8380  */
8381 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8382 {
8383         int status;
8384         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8385         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8386         struct nfs4_secinfo_arg args = {
8387                 .dir_fh = NFS_FH(dir),
8388                 .name   = name,
8389         };
8390         struct nfs4_secinfo_res res = {
8391                 .flavors     = flavors,
8392         };
8393         struct rpc_message msg = {
8394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8395                 .rpc_argp = &args,
8396                 .rpc_resp = &res,
8397         };
8398         struct nfs4_call_sync_data data = {
8399                 .seq_server = NFS_SERVER(dir),
8400                 .seq_args = &args.seq_args,
8401                 .seq_res = &res.seq_res,
8402         };
8403         struct rpc_task_setup task_setup = {
8404                 .rpc_client = clnt,
8405                 .rpc_message = &msg,
8406                 .callback_ops = clp->cl_mvops->call_sync_ops,
8407                 .callback_data = &data,
8408                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8409         };
8410         const struct cred *cred = NULL;
8411
8412         if (use_integrity) {
8413                 clnt = clp->cl_rpcclient;
8414                 task_setup.rpc_client = clnt;
8415
8416                 cred = nfs4_get_clid_cred(clp);
8417                 msg.rpc_cred = cred;
8418         }
8419
8420         dprintk("NFS call  secinfo %s\n", name->name);
8421
8422         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8423         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8424         status = nfs4_call_sync_custom(&task_setup);
8425
8426         dprintk("NFS reply  secinfo: %d\n", status);
8427
8428         put_cred(cred);
8429         return status;
8430 }
8431
8432 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8433                       struct nfs4_secinfo_flavors *flavors)
8434 {
8435         struct nfs4_exception exception = {
8436                 .interruptible = true,
8437         };
8438         int err;
8439         do {
8440                 err = -NFS4ERR_WRONGSEC;
8441
8442                 /* try to use integrity protection with machine cred */
8443                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8444                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8445
8446                 /*
8447                  * if unable to use integrity protection, or SECINFO with
8448                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8449                  * disallowed by spec, but exists in deployed servers) use
8450                  * the current filesystem's rpc_client and the user cred.
8451                  */
8452                 if (err == -NFS4ERR_WRONGSEC)
8453                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8454
8455                 trace_nfs4_secinfo(dir, name, err);
8456                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8457                                 &exception);
8458         } while (exception.retry);
8459         return err;
8460 }
8461
8462 #ifdef CONFIG_NFS_V4_1
8463 /*
8464  * Check the exchange flags returned by the server for invalid flags, having
8465  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8466  * DS flags set.
8467  */
8468 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8469 {
8470         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8471                 goto out_inval;
8472         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8473                 goto out_inval;
8474         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8475             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8476                 goto out_inval;
8477         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8478                 goto out_inval;
8479         return NFS_OK;
8480 out_inval:
8481         return -NFS4ERR_INVAL;
8482 }
8483
8484 static bool
8485 nfs41_same_server_scope(struct nfs41_server_scope *a,
8486                         struct nfs41_server_scope *b)
8487 {
8488         if (a->server_scope_sz != b->server_scope_sz)
8489                 return false;
8490         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8491 }
8492
8493 static void
8494 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8495 {
8496         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8497         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8498         struct nfs_client *clp = args->client;
8499
8500         switch (task->tk_status) {
8501         case -NFS4ERR_BADSESSION:
8502         case -NFS4ERR_DEADSESSION:
8503                 nfs4_schedule_session_recovery(clp->cl_session,
8504                                 task->tk_status);
8505                 return;
8506         }
8507         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8508                         res->dir != NFS4_CDFS4_BOTH) {
8509                 rpc_task_close_connection(task);
8510                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8511                         rpc_restart_call(task);
8512         }
8513 }
8514
8515 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8516         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8517 };
8518
8519 /*
8520  * nfs4_proc_bind_one_conn_to_session()
8521  *
8522  * The 4.1 client currently uses the same TCP connection for the
8523  * fore and backchannel.
8524  */
8525 static
8526 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8527                 struct rpc_xprt *xprt,
8528                 struct nfs_client *clp,
8529                 const struct cred *cred)
8530 {
8531         int status;
8532         struct nfs41_bind_conn_to_session_args args = {
8533                 .client = clp,
8534                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8535                 .retries = 0,
8536         };
8537         struct nfs41_bind_conn_to_session_res res;
8538         struct rpc_message msg = {
8539                 .rpc_proc =
8540                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8541                 .rpc_argp = &args,
8542                 .rpc_resp = &res,
8543                 .rpc_cred = cred,
8544         };
8545         struct rpc_task_setup task_setup_data = {
8546                 .rpc_client = clnt,
8547                 .rpc_xprt = xprt,
8548                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8549                 .rpc_message = &msg,
8550                 .flags = RPC_TASK_TIMEOUT,
8551         };
8552         struct rpc_task *task;
8553
8554         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8555         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8556                 args.dir = NFS4_CDFC4_FORE;
8557
8558         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8559         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8560                 args.dir = NFS4_CDFC4_FORE;
8561
8562         task = rpc_run_task(&task_setup_data);
8563         if (!IS_ERR(task)) {
8564                 status = task->tk_status;
8565                 rpc_put_task(task);
8566         } else
8567                 status = PTR_ERR(task);
8568         trace_nfs4_bind_conn_to_session(clp, status);
8569         if (status == 0) {
8570                 if (memcmp(res.sessionid.data,
8571                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8572                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8573                         return -EIO;
8574                 }
8575                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8576                         dprintk("NFS: %s: Unexpected direction from server\n",
8577                                 __func__);
8578                         return -EIO;
8579                 }
8580                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8581                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8582                                 __func__);
8583                         return -EIO;
8584                 }
8585         }
8586
8587         return status;
8588 }
8589
8590 struct rpc_bind_conn_calldata {
8591         struct nfs_client *clp;
8592         const struct cred *cred;
8593 };
8594
8595 static int
8596 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8597                 struct rpc_xprt *xprt,
8598                 void *calldata)
8599 {
8600         struct rpc_bind_conn_calldata *p = calldata;
8601
8602         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8603 }
8604
8605 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8606 {
8607         struct rpc_bind_conn_calldata data = {
8608                 .clp = clp,
8609                 .cred = cred,
8610         };
8611         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8612                         nfs4_proc_bind_conn_to_session_callback, &data);
8613 }
8614
8615 /*
8616  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8617  * and operations we'd like to see to enable certain features in the allow map
8618  */
8619 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8620         .how = SP4_MACH_CRED,
8621         .enforce.u.words = {
8622                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8623                       1 << (OP_EXCHANGE_ID - 32) |
8624                       1 << (OP_CREATE_SESSION - 32) |
8625                       1 << (OP_DESTROY_SESSION - 32) |
8626                       1 << (OP_DESTROY_CLIENTID - 32)
8627         },
8628         .allow.u.words = {
8629                 [0] = 1 << (OP_CLOSE) |
8630                       1 << (OP_OPEN_DOWNGRADE) |
8631                       1 << (OP_LOCKU) |
8632                       1 << (OP_DELEGRETURN) |
8633                       1 << (OP_COMMIT),
8634                 [1] = 1 << (OP_SECINFO - 32) |
8635                       1 << (OP_SECINFO_NO_NAME - 32) |
8636                       1 << (OP_LAYOUTRETURN - 32) |
8637                       1 << (OP_TEST_STATEID - 32) |
8638                       1 << (OP_FREE_STATEID - 32) |
8639                       1 << (OP_WRITE - 32)
8640         }
8641 };
8642
8643 /*
8644  * Select the state protection mode for client `clp' given the server results
8645  * from exchange_id in `sp'.
8646  *
8647  * Returns 0 on success, negative errno otherwise.
8648  */
8649 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8650                                  struct nfs41_state_protection *sp)
8651 {
8652         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8653                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8654                       1 << (OP_EXCHANGE_ID - 32) |
8655                       1 << (OP_CREATE_SESSION - 32) |
8656                       1 << (OP_DESTROY_SESSION - 32) |
8657                       1 << (OP_DESTROY_CLIENTID - 32)
8658         };
8659         unsigned long flags = 0;
8660         unsigned int i;
8661         int ret = 0;
8662
8663         if (sp->how == SP4_MACH_CRED) {
8664                 /* Print state protect result */
8665                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8666                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8667                         if (test_bit(i, sp->enforce.u.longs))
8668                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8669                         if (test_bit(i, sp->allow.u.longs))
8670                                 dfprintk(MOUNT, "  allow op %d\n", i);
8671                 }
8672
8673                 /* make sure nothing is on enforce list that isn't supported */
8674                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8675                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8676                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8677                                 ret = -EINVAL;
8678                                 goto out;
8679                         }
8680                 }
8681
8682                 /*
8683                  * Minimal mode - state operations are allowed to use machine
8684                  * credential.  Note this already happens by default, so the
8685                  * client doesn't have to do anything more than the negotiation.
8686                  *
8687                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8688                  *       we're already using the machine cred for exchange_id
8689                  *       and will never use a different cred.
8690                  */
8691                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8692                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8693                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8694                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8695                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8696                         dfprintk(MOUNT, "  minimal mode enabled\n");
8697                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8698                 } else {
8699                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8700                         ret = -EINVAL;
8701                         goto out;
8702                 }
8703
8704                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8705                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8706                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8707                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8708                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8709                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8710                 }
8711
8712                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8713                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8714                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8715                 }
8716
8717                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8718                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8719                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8720                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8721                 }
8722
8723                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8724                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8725                         dfprintk(MOUNT, "  stateid mode enabled\n");
8726                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8727                 }
8728
8729                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8730                         dfprintk(MOUNT, "  write mode enabled\n");
8731                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8732                 }
8733
8734                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8735                         dfprintk(MOUNT, "  commit mode enabled\n");
8736                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8737                 }
8738         }
8739 out:
8740         clp->cl_sp4_flags = flags;
8741         return ret;
8742 }
8743
8744 struct nfs41_exchange_id_data {
8745         struct nfs41_exchange_id_res res;
8746         struct nfs41_exchange_id_args args;
8747 };
8748
8749 static void nfs4_exchange_id_release(void *data)
8750 {
8751         struct nfs41_exchange_id_data *cdata =
8752                                         (struct nfs41_exchange_id_data *)data;
8753
8754         nfs_put_client(cdata->args.client);
8755         kfree(cdata->res.impl_id);
8756         kfree(cdata->res.server_scope);
8757         kfree(cdata->res.server_owner);
8758         kfree(cdata);
8759 }
8760
8761 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8762         .rpc_release = nfs4_exchange_id_release,
8763 };
8764
8765 /*
8766  * _nfs4_proc_exchange_id()
8767  *
8768  * Wrapper for EXCHANGE_ID operation.
8769  */
8770 static struct rpc_task *
8771 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8772                         u32 sp4_how, struct rpc_xprt *xprt)
8773 {
8774         struct rpc_message msg = {
8775                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8776                 .rpc_cred = cred,
8777         };
8778         struct rpc_task_setup task_setup_data = {
8779                 .rpc_client = clp->cl_rpcclient,
8780                 .callback_ops = &nfs4_exchange_id_call_ops,
8781                 .rpc_message = &msg,
8782                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8783         };
8784         struct nfs41_exchange_id_data *calldata;
8785         int status;
8786
8787         if (!refcount_inc_not_zero(&clp->cl_count))
8788                 return ERR_PTR(-EIO);
8789
8790         status = -ENOMEM;
8791         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8792         if (!calldata)
8793                 goto out;
8794
8795         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8796
8797         status = nfs4_init_uniform_client_string(clp);
8798         if (status)
8799                 goto out_calldata;
8800
8801         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8802                                                 GFP_NOFS);
8803         status = -ENOMEM;
8804         if (unlikely(calldata->res.server_owner == NULL))
8805                 goto out_calldata;
8806
8807         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8808                                         GFP_NOFS);
8809         if (unlikely(calldata->res.server_scope == NULL))
8810                 goto out_server_owner;
8811
8812         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8813         if (unlikely(calldata->res.impl_id == NULL))
8814                 goto out_server_scope;
8815
8816         switch (sp4_how) {
8817         case SP4_NONE:
8818                 calldata->args.state_protect.how = SP4_NONE;
8819                 break;
8820
8821         case SP4_MACH_CRED:
8822                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8823                 break;
8824
8825         default:
8826                 /* unsupported! */
8827                 WARN_ON_ONCE(1);
8828                 status = -EINVAL;
8829                 goto out_impl_id;
8830         }
8831         if (xprt) {
8832                 task_setup_data.rpc_xprt = xprt;
8833                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8834                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8835                                 sizeof(calldata->args.verifier.data));
8836         }
8837         calldata->args.client = clp;
8838         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8839         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8840 #ifdef CONFIG_NFS_V4_1_MIGRATION
8841         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8842 #endif
8843         if (test_bit(NFS_CS_DS, &clp->cl_flags))
8844                 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8845         msg.rpc_argp = &calldata->args;
8846         msg.rpc_resp = &calldata->res;
8847         task_setup_data.callback_data = calldata;
8848
8849         return rpc_run_task(&task_setup_data);
8850
8851 out_impl_id:
8852         kfree(calldata->res.impl_id);
8853 out_server_scope:
8854         kfree(calldata->res.server_scope);
8855 out_server_owner:
8856         kfree(calldata->res.server_owner);
8857 out_calldata:
8858         kfree(calldata);
8859 out:
8860         nfs_put_client(clp);
8861         return ERR_PTR(status);
8862 }
8863
8864 /*
8865  * _nfs4_proc_exchange_id()
8866  *
8867  * Wrapper for EXCHANGE_ID operation.
8868  */
8869 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8870                         u32 sp4_how)
8871 {
8872         struct rpc_task *task;
8873         struct nfs41_exchange_id_args *argp;
8874         struct nfs41_exchange_id_res *resp;
8875         unsigned long now = jiffies;
8876         int status;
8877
8878         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8879         if (IS_ERR(task))
8880                 return PTR_ERR(task);
8881
8882         argp = task->tk_msg.rpc_argp;
8883         resp = task->tk_msg.rpc_resp;
8884         status = task->tk_status;
8885         if (status  != 0)
8886                 goto out;
8887
8888         status = nfs4_check_cl_exchange_flags(resp->flags,
8889                         clp->cl_mvops->minor_version);
8890         if (status  != 0)
8891                 goto out;
8892
8893         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8894         if (status != 0)
8895                 goto out;
8896
8897         do_renew_lease(clp, now);
8898
8899         clp->cl_clientid = resp->clientid;
8900         clp->cl_exchange_flags = resp->flags;
8901         clp->cl_seqid = resp->seqid;
8902         /* Client ID is not confirmed */
8903         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8904                 clear_bit(NFS4_SESSION_ESTABLISHED,
8905                           &clp->cl_session->session_state);
8906
8907         if (clp->cl_serverscope != NULL &&
8908             !nfs41_same_server_scope(clp->cl_serverscope,
8909                                 resp->server_scope)) {
8910                 dprintk("%s: server_scope mismatch detected\n",
8911                         __func__);
8912                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8913         }
8914
8915         swap(clp->cl_serverowner, resp->server_owner);
8916         swap(clp->cl_serverscope, resp->server_scope);
8917         swap(clp->cl_implid, resp->impl_id);
8918
8919         /* Save the EXCHANGE_ID verifier session trunk tests */
8920         memcpy(clp->cl_confirm.data, argp->verifier.data,
8921                sizeof(clp->cl_confirm.data));
8922 out:
8923         trace_nfs4_exchange_id(clp, status);
8924         rpc_put_task(task);
8925         return status;
8926 }
8927
8928 /*
8929  * nfs4_proc_exchange_id()
8930  *
8931  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8932  *
8933  * Since the clientid has expired, all compounds using sessions
8934  * associated with the stale clientid will be returning
8935  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8936  * be in some phase of session reset.
8937  *
8938  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8939  */
8940 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8941 {
8942         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8943         int status;
8944
8945         /* try SP4_MACH_CRED if krb5i/p */
8946         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8947             authflavor == RPC_AUTH_GSS_KRB5P) {
8948                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8949                 if (!status)
8950                         return 0;
8951         }
8952
8953         /* try SP4_NONE */
8954         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8955 }
8956
8957 /**
8958  * nfs4_test_session_trunk
8959  *
8960  * This is an add_xprt_test() test function called from
8961  * rpc_clnt_setup_test_and_add_xprt.
8962  *
8963  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8964  * and is dereferrenced in nfs4_exchange_id_release
8965  *
8966  * Upon success, add the new transport to the rpc_clnt
8967  *
8968  * @clnt: struct rpc_clnt to get new transport
8969  * @xprt: the rpc_xprt to test
8970  * @data: call data for _nfs4_proc_exchange_id.
8971  */
8972 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8973                             void *data)
8974 {
8975         struct nfs4_add_xprt_data *adata = data;
8976         struct rpc_task *task;
8977         int status;
8978
8979         u32 sp4_how;
8980
8981         dprintk("--> %s try %s\n", __func__,
8982                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8983
8984         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8985
8986 try_again:
8987         /* Test connection for session trunking. Async exchange_id call */
8988         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8989         if (IS_ERR(task))
8990                 return;
8991
8992         status = task->tk_status;
8993         if (status == 0) {
8994                 status = nfs4_detect_session_trunking(adata->clp,
8995                                 task->tk_msg.rpc_resp, xprt);
8996                 trace_nfs4_trunked_exchange_id(adata->clp,
8997                         xprt->address_strings[RPC_DISPLAY_ADDR], status);
8998         }
8999         if (status == 0)
9000                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
9001         else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
9002                                 (struct sockaddr *)&xprt->addr))
9003                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
9004
9005         rpc_put_task(task);
9006         if (status == -NFS4ERR_DELAY) {
9007                 ssleep(1);
9008                 goto try_again;
9009         }
9010 }
9011 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
9012
9013 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
9014                 const struct cred *cred)
9015 {
9016         struct rpc_message msg = {
9017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
9018                 .rpc_argp = clp,
9019                 .rpc_cred = cred,
9020         };
9021         int status;
9022
9023         status = rpc_call_sync(clp->cl_rpcclient, &msg,
9024                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9025         trace_nfs4_destroy_clientid(clp, status);
9026         if (status)
9027                 dprintk("NFS: Got error %d from the server %s on "
9028                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
9029         return status;
9030 }
9031
9032 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
9033                 const struct cred *cred)
9034 {
9035         unsigned int loop;
9036         int ret;
9037
9038         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
9039                 ret = _nfs4_proc_destroy_clientid(clp, cred);
9040                 switch (ret) {
9041                 case -NFS4ERR_DELAY:
9042                 case -NFS4ERR_CLIENTID_BUSY:
9043                         ssleep(1);
9044                         break;
9045                 default:
9046                         return ret;
9047                 }
9048         }
9049         return 0;
9050 }
9051
9052 int nfs4_destroy_clientid(struct nfs_client *clp)
9053 {
9054         const struct cred *cred;
9055         int ret = 0;
9056
9057         if (clp->cl_mvops->minor_version < 1)
9058                 goto out;
9059         if (clp->cl_exchange_flags == 0)
9060                 goto out;
9061         if (clp->cl_preserve_clid)
9062                 goto out;
9063         cred = nfs4_get_clid_cred(clp);
9064         ret = nfs4_proc_destroy_clientid(clp, cred);
9065         put_cred(cred);
9066         switch (ret) {
9067         case 0:
9068         case -NFS4ERR_STALE_CLIENTID:
9069                 clp->cl_exchange_flags = 0;
9070         }
9071 out:
9072         return ret;
9073 }
9074
9075 #endif /* CONFIG_NFS_V4_1 */
9076
9077 struct nfs4_get_lease_time_data {
9078         struct nfs4_get_lease_time_args *args;
9079         struct nfs4_get_lease_time_res *res;
9080         struct nfs_client *clp;
9081 };
9082
9083 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9084                                         void *calldata)
9085 {
9086         struct nfs4_get_lease_time_data *data =
9087                         (struct nfs4_get_lease_time_data *)calldata;
9088
9089         /* just setup sequence, do not trigger session recovery
9090            since we're invoked within one */
9091         nfs4_setup_sequence(data->clp,
9092                         &data->args->la_seq_args,
9093                         &data->res->lr_seq_res,
9094                         task);
9095 }
9096
9097 /*
9098  * Called from nfs4_state_manager thread for session setup, so don't recover
9099  * from sequence operation or clientid errors.
9100  */
9101 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9102 {
9103         struct nfs4_get_lease_time_data *data =
9104                         (struct nfs4_get_lease_time_data *)calldata;
9105
9106         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9107                 return;
9108         switch (task->tk_status) {
9109         case -NFS4ERR_DELAY:
9110         case -NFS4ERR_GRACE:
9111                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9112                 task->tk_status = 0;
9113                 fallthrough;
9114         case -NFS4ERR_RETRY_UNCACHED_REP:
9115                 rpc_restart_call_prepare(task);
9116                 return;
9117         }
9118 }
9119
9120 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9121         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9122         .rpc_call_done = nfs4_get_lease_time_done,
9123 };
9124
9125 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9126 {
9127         struct nfs4_get_lease_time_args args;
9128         struct nfs4_get_lease_time_res res = {
9129                 .lr_fsinfo = fsinfo,
9130         };
9131         struct nfs4_get_lease_time_data data = {
9132                 .args = &args,
9133                 .res = &res,
9134                 .clp = clp,
9135         };
9136         struct rpc_message msg = {
9137                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9138                 .rpc_argp = &args,
9139                 .rpc_resp = &res,
9140         };
9141         struct rpc_task_setup task_setup = {
9142                 .rpc_client = clp->cl_rpcclient,
9143                 .rpc_message = &msg,
9144                 .callback_ops = &nfs4_get_lease_time_ops,
9145                 .callback_data = &data,
9146                 .flags = RPC_TASK_TIMEOUT,
9147         };
9148
9149         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9150         return nfs4_call_sync_custom(&task_setup);
9151 }
9152
9153 #ifdef CONFIG_NFS_V4_1
9154
9155 /*
9156  * Initialize the values to be used by the client in CREATE_SESSION
9157  * If nfs4_init_session set the fore channel request and response sizes,
9158  * use them.
9159  *
9160  * Set the back channel max_resp_sz_cached to zero to force the client to
9161  * always set csa_cachethis to FALSE because the current implementation
9162  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9163  */
9164 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9165                                     struct rpc_clnt *clnt)
9166 {
9167         unsigned int max_rqst_sz, max_resp_sz;
9168         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9169         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9170
9171         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9172         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9173
9174         /* Fore channel attributes */
9175         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9176         args->fc_attrs.max_resp_sz = max_resp_sz;
9177         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9178         args->fc_attrs.max_reqs = max_session_slots;
9179
9180         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9181                 "max_ops=%u max_reqs=%u\n",
9182                 __func__,
9183                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9184                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9185
9186         /* Back channel attributes */
9187         args->bc_attrs.max_rqst_sz = max_bc_payload;
9188         args->bc_attrs.max_resp_sz = max_bc_payload;
9189         args->bc_attrs.max_resp_sz_cached = 0;
9190         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9191         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9192         if (args->bc_attrs.max_reqs > max_bc_slots)
9193                 args->bc_attrs.max_reqs = max_bc_slots;
9194
9195         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9196                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9197                 __func__,
9198                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9199                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9200                 args->bc_attrs.max_reqs);
9201 }
9202
9203 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9204                 struct nfs41_create_session_res *res)
9205 {
9206         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9207         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9208
9209         if (rcvd->max_resp_sz > sent->max_resp_sz)
9210                 return -EINVAL;
9211         /*
9212          * Our requested max_ops is the minimum we need; we're not
9213          * prepared to break up compounds into smaller pieces than that.
9214          * So, no point even trying to continue if the server won't
9215          * cooperate:
9216          */
9217         if (rcvd->max_ops < sent->max_ops)
9218                 return -EINVAL;
9219         if (rcvd->max_reqs == 0)
9220                 return -EINVAL;
9221         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9222                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9223         return 0;
9224 }
9225
9226 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9227                 struct nfs41_create_session_res *res)
9228 {
9229         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9230         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9231
9232         if (!(res->flags & SESSION4_BACK_CHAN))
9233                 goto out;
9234         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9235                 return -EINVAL;
9236         if (rcvd->max_resp_sz < sent->max_resp_sz)
9237                 return -EINVAL;
9238         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9239                 return -EINVAL;
9240         if (rcvd->max_ops > sent->max_ops)
9241                 return -EINVAL;
9242         if (rcvd->max_reqs > sent->max_reqs)
9243                 return -EINVAL;
9244 out:
9245         return 0;
9246 }
9247
9248 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9249                                      struct nfs41_create_session_res *res)
9250 {
9251         int ret;
9252
9253         ret = nfs4_verify_fore_channel_attrs(args, res);
9254         if (ret)
9255                 return ret;
9256         return nfs4_verify_back_channel_attrs(args, res);
9257 }
9258
9259 static void nfs4_update_session(struct nfs4_session *session,
9260                 struct nfs41_create_session_res *res)
9261 {
9262         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9263         /* Mark client id and session as being confirmed */
9264         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9265         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9266         session->flags = res->flags;
9267         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9268         if (res->flags & SESSION4_BACK_CHAN)
9269                 memcpy(&session->bc_attrs, &res->bc_attrs,
9270                                 sizeof(session->bc_attrs));
9271 }
9272
9273 static int _nfs4_proc_create_session(struct nfs_client *clp,
9274                 const struct cred *cred)
9275 {
9276         struct nfs4_session *session = clp->cl_session;
9277         struct nfs41_create_session_args args = {
9278                 .client = clp,
9279                 .clientid = clp->cl_clientid,
9280                 .seqid = clp->cl_seqid,
9281                 .cb_program = NFS4_CALLBACK,
9282         };
9283         struct nfs41_create_session_res res;
9284
9285         struct rpc_message msg = {
9286                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9287                 .rpc_argp = &args,
9288                 .rpc_resp = &res,
9289                 .rpc_cred = cred,
9290         };
9291         int status;
9292
9293         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9294         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9295
9296         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9297                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9298         trace_nfs4_create_session(clp, status);
9299
9300         switch (status) {
9301         case -NFS4ERR_STALE_CLIENTID:
9302         case -NFS4ERR_DELAY:
9303         case -ETIMEDOUT:
9304         case -EACCES:
9305         case -EAGAIN:
9306                 goto out;
9307         }
9308
9309         clp->cl_seqid++;
9310         if (!status) {
9311                 /* Verify the session's negotiated channel_attrs values */
9312                 status = nfs4_verify_channel_attrs(&args, &res);
9313                 /* Increment the clientid slot sequence id */
9314                 if (status)
9315                         goto out;
9316                 nfs4_update_session(session, &res);
9317         }
9318 out:
9319         return status;
9320 }
9321
9322 /*
9323  * Issues a CREATE_SESSION operation to the server.
9324  * It is the responsibility of the caller to verify the session is
9325  * expired before calling this routine.
9326  */
9327 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9328 {
9329         int status;
9330         unsigned *ptr;
9331         struct nfs4_session *session = clp->cl_session;
9332         struct nfs4_add_xprt_data xprtdata = {
9333                 .clp = clp,
9334         };
9335         struct rpc_add_xprt_test rpcdata = {
9336                 .add_xprt_test = clp->cl_mvops->session_trunk,
9337                 .data = &xprtdata,
9338         };
9339
9340         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9341
9342         status = _nfs4_proc_create_session(clp, cred);
9343         if (status)
9344                 goto out;
9345
9346         /* Init or reset the session slot tables */
9347         status = nfs4_setup_session_slot_tables(session);
9348         dprintk("slot table setup returned %d\n", status);
9349         if (status)
9350                 goto out;
9351
9352         ptr = (unsigned *)&session->sess_id.data[0];
9353         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9354                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9355         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9356 out:
9357         return status;
9358 }
9359
9360 /*
9361  * Issue the over-the-wire RPC DESTROY_SESSION.
9362  * The caller must serialize access to this routine.
9363  */
9364 int nfs4_proc_destroy_session(struct nfs4_session *session,
9365                 const struct cred *cred)
9366 {
9367         struct rpc_message msg = {
9368                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9369                 .rpc_argp = session,
9370                 .rpc_cred = cred,
9371         };
9372         int status = 0;
9373
9374         /* session is still being setup */
9375         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9376                 return 0;
9377
9378         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9379                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9380         trace_nfs4_destroy_session(session->clp, status);
9381
9382         if (status)
9383                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9384                         "Session has been destroyed regardless...\n", status);
9385         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9386         return status;
9387 }
9388
9389 /*
9390  * Renew the cl_session lease.
9391  */
9392 struct nfs4_sequence_data {
9393         struct nfs_client *clp;
9394         struct nfs4_sequence_args args;
9395         struct nfs4_sequence_res res;
9396 };
9397
9398 static void nfs41_sequence_release(void *data)
9399 {
9400         struct nfs4_sequence_data *calldata = data;
9401         struct nfs_client *clp = calldata->clp;
9402
9403         if (refcount_read(&clp->cl_count) > 1)
9404                 nfs4_schedule_state_renewal(clp);
9405         nfs_put_client(clp);
9406         kfree(calldata);
9407 }
9408
9409 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9410 {
9411         switch(task->tk_status) {
9412         case -NFS4ERR_DELAY:
9413                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9414                 return -EAGAIN;
9415         default:
9416                 nfs4_schedule_lease_recovery(clp);
9417         }
9418         return 0;
9419 }
9420
9421 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9422 {
9423         struct nfs4_sequence_data *calldata = data;
9424         struct nfs_client *clp = calldata->clp;
9425
9426         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9427                 return;
9428
9429         trace_nfs4_sequence(clp, task->tk_status);
9430         if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9431                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9432                 if (refcount_read(&clp->cl_count) == 1)
9433                         return;
9434
9435                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9436                         rpc_restart_call_prepare(task);
9437                         return;
9438                 }
9439         }
9440         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9441 }
9442
9443 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9444 {
9445         struct nfs4_sequence_data *calldata = data;
9446         struct nfs_client *clp = calldata->clp;
9447         struct nfs4_sequence_args *args;
9448         struct nfs4_sequence_res *res;
9449
9450         args = task->tk_msg.rpc_argp;
9451         res = task->tk_msg.rpc_resp;
9452
9453         nfs4_setup_sequence(clp, args, res, task);
9454 }
9455
9456 static const struct rpc_call_ops nfs41_sequence_ops = {
9457         .rpc_call_done = nfs41_sequence_call_done,
9458         .rpc_call_prepare = nfs41_sequence_prepare,
9459         .rpc_release = nfs41_sequence_release,
9460 };
9461
9462 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9463                 const struct cred *cred,
9464                 struct nfs4_slot *slot,
9465                 bool is_privileged)
9466 {
9467         struct nfs4_sequence_data *calldata;
9468         struct rpc_message msg = {
9469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9470                 .rpc_cred = cred,
9471         };
9472         struct rpc_task_setup task_setup_data = {
9473                 .rpc_client = clp->cl_rpcclient,
9474                 .rpc_message = &msg,
9475                 .callback_ops = &nfs41_sequence_ops,
9476                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9477         };
9478         struct rpc_task *ret;
9479
9480         ret = ERR_PTR(-EIO);
9481         if (!refcount_inc_not_zero(&clp->cl_count))
9482                 goto out_err;
9483
9484         ret = ERR_PTR(-ENOMEM);
9485         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9486         if (calldata == NULL)
9487                 goto out_put_clp;
9488         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9489         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9490         msg.rpc_argp = &calldata->args;
9491         msg.rpc_resp = &calldata->res;
9492         calldata->clp = clp;
9493         task_setup_data.callback_data = calldata;
9494
9495         ret = rpc_run_task(&task_setup_data);
9496         if (IS_ERR(ret))
9497                 goto out_err;
9498         return ret;
9499 out_put_clp:
9500         nfs_put_client(clp);
9501 out_err:
9502         nfs41_release_slot(slot);
9503         return ret;
9504 }
9505
9506 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9507 {
9508         struct rpc_task *task;
9509         int ret = 0;
9510
9511         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9512                 return -EAGAIN;
9513         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9514         if (IS_ERR(task))
9515                 ret = PTR_ERR(task);
9516         else
9517                 rpc_put_task_async(task);
9518         dprintk("<-- %s status=%d\n", __func__, ret);
9519         return ret;
9520 }
9521
9522 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9523 {
9524         struct rpc_task *task;
9525         int ret;
9526
9527         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9528         if (IS_ERR(task)) {
9529                 ret = PTR_ERR(task);
9530                 goto out;
9531         }
9532         ret = rpc_wait_for_completion_task(task);
9533         if (!ret)
9534                 ret = task->tk_status;
9535         rpc_put_task(task);
9536 out:
9537         dprintk("<-- %s status=%d\n", __func__, ret);
9538         return ret;
9539 }
9540
9541 struct nfs4_reclaim_complete_data {
9542         struct nfs_client *clp;
9543         struct nfs41_reclaim_complete_args arg;
9544         struct nfs41_reclaim_complete_res res;
9545 };
9546
9547 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9548 {
9549         struct nfs4_reclaim_complete_data *calldata = data;
9550
9551         nfs4_setup_sequence(calldata->clp,
9552                         &calldata->arg.seq_args,
9553                         &calldata->res.seq_res,
9554                         task);
9555 }
9556
9557 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9558 {
9559         switch(task->tk_status) {
9560         case 0:
9561                 wake_up_all(&clp->cl_lock_waitq);
9562                 fallthrough;
9563         case -NFS4ERR_COMPLETE_ALREADY:
9564         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9565                 break;
9566         case -NFS4ERR_DELAY:
9567                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9568                 fallthrough;
9569         case -NFS4ERR_RETRY_UNCACHED_REP:
9570         case -EACCES:
9571                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9572                         __func__, task->tk_status, clp->cl_hostname);
9573                 return -EAGAIN;
9574         case -NFS4ERR_BADSESSION:
9575         case -NFS4ERR_DEADSESSION:
9576         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9577                 break;
9578         default:
9579                 nfs4_schedule_lease_recovery(clp);
9580         }
9581         return 0;
9582 }
9583
9584 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9585 {
9586         struct nfs4_reclaim_complete_data *calldata = data;
9587         struct nfs_client *clp = calldata->clp;
9588         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9589
9590         if (!nfs41_sequence_done(task, res))
9591                 return;
9592
9593         trace_nfs4_reclaim_complete(clp, task->tk_status);
9594         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9595                 rpc_restart_call_prepare(task);
9596                 return;
9597         }
9598 }
9599
9600 static void nfs4_free_reclaim_complete_data(void *data)
9601 {
9602         struct nfs4_reclaim_complete_data *calldata = data;
9603
9604         kfree(calldata);
9605 }
9606
9607 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9608         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9609         .rpc_call_done = nfs4_reclaim_complete_done,
9610         .rpc_release = nfs4_free_reclaim_complete_data,
9611 };
9612
9613 /*
9614  * Issue a global reclaim complete.
9615  */
9616 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9617                 const struct cred *cred)
9618 {
9619         struct nfs4_reclaim_complete_data *calldata;
9620         struct rpc_message msg = {
9621                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9622                 .rpc_cred = cred,
9623         };
9624         struct rpc_task_setup task_setup_data = {
9625                 .rpc_client = clp->cl_rpcclient,
9626                 .rpc_message = &msg,
9627                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9628                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9629         };
9630         int status = -ENOMEM;
9631
9632         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9633         if (calldata == NULL)
9634                 goto out;
9635         calldata->clp = clp;
9636         calldata->arg.one_fs = 0;
9637
9638         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9639         msg.rpc_argp = &calldata->arg;
9640         msg.rpc_resp = &calldata->res;
9641         task_setup_data.callback_data = calldata;
9642         status = nfs4_call_sync_custom(&task_setup_data);
9643 out:
9644         dprintk("<-- %s status=%d\n", __func__, status);
9645         return status;
9646 }
9647
9648 static void
9649 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9650 {
9651         struct nfs4_layoutget *lgp = calldata;
9652         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9653
9654         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9655                                 &lgp->res.seq_res, task);
9656 }
9657
9658 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9659 {
9660         struct nfs4_layoutget *lgp = calldata;
9661
9662         nfs41_sequence_process(task, &lgp->res.seq_res);
9663 }
9664
9665 static int
9666 nfs4_layoutget_handle_exception(struct rpc_task *task,
9667                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9668 {
9669         struct inode *inode = lgp->args.inode;
9670         struct nfs_server *server = NFS_SERVER(inode);
9671         struct pnfs_layout_hdr *lo = lgp->lo;
9672         int nfs4err = task->tk_status;
9673         int err, status = 0;
9674         LIST_HEAD(head);
9675
9676         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9677
9678         nfs4_sequence_free_slot(&lgp->res.seq_res);
9679
9680         exception->state = NULL;
9681         exception->stateid = NULL;
9682
9683         switch (nfs4err) {
9684         case 0:
9685                 goto out;
9686
9687         /*
9688          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9689          * on the file. set tk_status to -ENODATA to tell upper layer to
9690          * retry go inband.
9691          */
9692         case -NFS4ERR_LAYOUTUNAVAILABLE:
9693                 status = -ENODATA;
9694                 goto out;
9695         /*
9696          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9697          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9698          */
9699         case -NFS4ERR_BADLAYOUT:
9700                 status = -EOVERFLOW;
9701                 goto out;
9702         /*
9703          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9704          * (or clients) writing to the same RAID stripe except when
9705          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9706          *
9707          * Treat it like we would RECALLCONFLICT -- we retry for a little
9708          * while, and then eventually give up.
9709          */
9710         case -NFS4ERR_LAYOUTTRYLATER:
9711                 if (lgp->args.minlength == 0) {
9712                         status = -EOVERFLOW;
9713                         goto out;
9714                 }
9715                 status = -EBUSY;
9716                 break;
9717         case -NFS4ERR_RECALLCONFLICT:
9718         case -NFS4ERR_RETURNCONFLICT:
9719                 status = -ERECALLCONFLICT;
9720                 break;
9721         case -NFS4ERR_DELEG_REVOKED:
9722         case -NFS4ERR_ADMIN_REVOKED:
9723         case -NFS4ERR_EXPIRED:
9724         case -NFS4ERR_BAD_STATEID:
9725                 exception->timeout = 0;
9726                 spin_lock(&inode->i_lock);
9727                 /* If the open stateid was bad, then recover it. */
9728                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9729                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9730                         spin_unlock(&inode->i_lock);
9731                         exception->state = lgp->args.ctx->state;
9732                         exception->stateid = &lgp->args.stateid;
9733                         break;
9734                 }
9735
9736                 /*
9737                  * Mark the bad layout state as invalid, then retry
9738                  */
9739                 pnfs_mark_layout_stateid_invalid(lo, &head);
9740                 spin_unlock(&inode->i_lock);
9741                 nfs_commit_inode(inode, 0);
9742                 pnfs_free_lseg_list(&head);
9743                 status = -EAGAIN;
9744                 goto out;
9745         }
9746
9747         err = nfs4_handle_exception(server, nfs4err, exception);
9748         if (!status) {
9749                 if (exception->retry)
9750                         status = -EAGAIN;
9751                 else
9752                         status = err;
9753         }
9754 out:
9755         return status;
9756 }
9757
9758 size_t max_response_pages(struct nfs_server *server)
9759 {
9760         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9761         return nfs_page_array_len(0, max_resp_sz);
9762 }
9763
9764 static void nfs4_layoutget_release(void *calldata)
9765 {
9766         struct nfs4_layoutget *lgp = calldata;
9767
9768         nfs4_sequence_free_slot(&lgp->res.seq_res);
9769         pnfs_layoutget_free(lgp);
9770 }
9771
9772 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9773         .rpc_call_prepare = nfs4_layoutget_prepare,
9774         .rpc_call_done = nfs4_layoutget_done,
9775         .rpc_release = nfs4_layoutget_release,
9776 };
9777
9778 struct pnfs_layout_segment *
9779 nfs4_proc_layoutget(struct nfs4_layoutget *lgp,
9780                     struct nfs4_exception *exception)
9781 {
9782         struct inode *inode = lgp->args.inode;
9783         struct nfs_server *server = NFS_SERVER(inode);
9784         struct rpc_task *task;
9785         struct rpc_message msg = {
9786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9787                 .rpc_argp = &lgp->args,
9788                 .rpc_resp = &lgp->res,
9789                 .rpc_cred = lgp->cred,
9790         };
9791         struct rpc_task_setup task_setup_data = {
9792                 .rpc_client = server->client,
9793                 .rpc_message = &msg,
9794                 .callback_ops = &nfs4_layoutget_call_ops,
9795                 .callback_data = lgp,
9796                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9797                          RPC_TASK_MOVEABLE,
9798         };
9799         struct pnfs_layout_segment *lseg = NULL;
9800         int status = 0;
9801
9802         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9803         exception->retry = 0;
9804
9805         task = rpc_run_task(&task_setup_data);
9806         if (IS_ERR(task))
9807                 return ERR_CAST(task);
9808
9809         status = rpc_wait_for_completion_task(task);
9810         if (status != 0)
9811                 goto out;
9812
9813         if (task->tk_status < 0) {
9814                 exception->retry = 1;
9815                 status = nfs4_layoutget_handle_exception(task, lgp, exception);
9816         } else if (lgp->res.layoutp->len == 0) {
9817                 exception->retry = 1;
9818                 status = -EAGAIN;
9819                 nfs4_update_delay(&exception->timeout);
9820         } else
9821                 lseg = pnfs_layout_process(lgp);
9822 out:
9823         trace_nfs4_layoutget(lgp->args.ctx,
9824                         &lgp->args.range,
9825                         &lgp->res.range,
9826                         &lgp->res.stateid,
9827                         status);
9828
9829         rpc_put_task(task);
9830         dprintk("<-- %s status=%d\n", __func__, status);
9831         if (status)
9832                 return ERR_PTR(status);
9833         return lseg;
9834 }
9835
9836 static void
9837 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9838 {
9839         struct nfs4_layoutreturn *lrp = calldata;
9840
9841         nfs4_setup_sequence(lrp->clp,
9842                         &lrp->args.seq_args,
9843                         &lrp->res.seq_res,
9844                         task);
9845         if (!pnfs_layout_is_valid(lrp->args.layout))
9846                 rpc_exit(task, 0);
9847 }
9848
9849 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9850 {
9851         struct nfs4_layoutreturn *lrp = calldata;
9852         struct nfs_server *server;
9853
9854         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9855                 return;
9856
9857         /*
9858          * Was there an RPC level error? Assume the call succeeded,
9859          * and that we need to release the layout
9860          */
9861         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9862                 lrp->res.lrs_present = 0;
9863                 return;
9864         }
9865
9866         server = NFS_SERVER(lrp->args.inode);
9867         switch (task->tk_status) {
9868         case -NFS4ERR_OLD_STATEID:
9869                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9870                                         &lrp->args.range,
9871                                         lrp->args.inode))
9872                         goto out_restart;
9873                 fallthrough;
9874         default:
9875                 task->tk_status = 0;
9876                 fallthrough;
9877         case 0:
9878                 break;
9879         case -NFS4ERR_DELAY:
9880                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9881                         break;
9882                 goto out_restart;
9883         }
9884         return;
9885 out_restart:
9886         task->tk_status = 0;
9887         nfs4_sequence_free_slot(&lrp->res.seq_res);
9888         rpc_restart_call_prepare(task);
9889 }
9890
9891 static void nfs4_layoutreturn_release(void *calldata)
9892 {
9893         struct nfs4_layoutreturn *lrp = calldata;
9894         struct pnfs_layout_hdr *lo = lrp->args.layout;
9895
9896         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9897                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9898         nfs4_sequence_free_slot(&lrp->res.seq_res);
9899         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9900                 lrp->ld_private.ops->free(&lrp->ld_private);
9901         pnfs_put_layout_hdr(lrp->args.layout);
9902         nfs_iput_and_deactive(lrp->inode);
9903         put_cred(lrp->cred);
9904         kfree(calldata);
9905 }
9906
9907 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9908         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9909         .rpc_call_done = nfs4_layoutreturn_done,
9910         .rpc_release = nfs4_layoutreturn_release,
9911 };
9912
9913 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9914 {
9915         struct rpc_task *task;
9916         struct rpc_message msg = {
9917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9918                 .rpc_argp = &lrp->args,
9919                 .rpc_resp = &lrp->res,
9920                 .rpc_cred = lrp->cred,
9921         };
9922         struct rpc_task_setup task_setup_data = {
9923                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9924                 .rpc_message = &msg,
9925                 .callback_ops = &nfs4_layoutreturn_call_ops,
9926                 .callback_data = lrp,
9927                 .flags = RPC_TASK_MOVEABLE,
9928         };
9929         int status = 0;
9930
9931         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9932                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9933                         &task_setup_data.rpc_client, &msg);
9934
9935         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9936         if (!sync) {
9937                 if (!lrp->inode) {
9938                         nfs4_layoutreturn_release(lrp);
9939                         return -EAGAIN;
9940                 }
9941                 task_setup_data.flags |= RPC_TASK_ASYNC;
9942         }
9943         if (!lrp->inode)
9944                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9945                                    1);
9946         else
9947                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9948                                    0);
9949         task = rpc_run_task(&task_setup_data);
9950         if (IS_ERR(task))
9951                 return PTR_ERR(task);
9952         if (sync)
9953                 status = task->tk_status;
9954         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9955         dprintk("<-- %s status=%d\n", __func__, status);
9956         rpc_put_task(task);
9957         return status;
9958 }
9959
9960 static int
9961 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9962                 struct pnfs_device *pdev,
9963                 const struct cred *cred)
9964 {
9965         struct nfs4_getdeviceinfo_args args = {
9966                 .pdev = pdev,
9967                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9968                         NOTIFY_DEVICEID4_DELETE,
9969         };
9970         struct nfs4_getdeviceinfo_res res = {
9971                 .pdev = pdev,
9972         };
9973         struct rpc_message msg = {
9974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9975                 .rpc_argp = &args,
9976                 .rpc_resp = &res,
9977                 .rpc_cred = cred,
9978         };
9979         int status;
9980
9981         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9982         if (res.notification & ~args.notify_types)
9983                 dprintk("%s: unsupported notification\n", __func__);
9984         if (res.notification != args.notify_types)
9985                 pdev->nocache = 1;
9986
9987         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9988
9989         dprintk("<-- %s status=%d\n", __func__, status);
9990
9991         return status;
9992 }
9993
9994 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9995                 struct pnfs_device *pdev,
9996                 const struct cred *cred)
9997 {
9998         struct nfs4_exception exception = { };
9999         int err;
10000
10001         do {
10002                 err = nfs4_handle_exception(server,
10003                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
10004                                         &exception);
10005         } while (exception.retry);
10006         return err;
10007 }
10008 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
10009
10010 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
10011 {
10012         struct nfs4_layoutcommit_data *data = calldata;
10013         struct nfs_server *server = NFS_SERVER(data->args.inode);
10014
10015         nfs4_setup_sequence(server->nfs_client,
10016                         &data->args.seq_args,
10017                         &data->res.seq_res,
10018                         task);
10019 }
10020
10021 static void
10022 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
10023 {
10024         struct nfs4_layoutcommit_data *data = calldata;
10025         struct nfs_server *server = NFS_SERVER(data->args.inode);
10026
10027         if (!nfs41_sequence_done(task, &data->res.seq_res))
10028                 return;
10029
10030         switch (task->tk_status) { /* Just ignore these failures */
10031         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
10032         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
10033         case -NFS4ERR_BADLAYOUT:     /* no layout */
10034         case -NFS4ERR_GRACE:        /* loca_recalim always false */
10035                 task->tk_status = 0;
10036                 break;
10037         case 0:
10038                 break;
10039         default:
10040                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
10041                         rpc_restart_call_prepare(task);
10042                         return;
10043                 }
10044         }
10045 }
10046
10047 static void nfs4_layoutcommit_release(void *calldata)
10048 {
10049         struct nfs4_layoutcommit_data *data = calldata;
10050
10051         pnfs_cleanup_layoutcommit(data);
10052         nfs_post_op_update_inode_force_wcc(data->args.inode,
10053                                            data->res.fattr);
10054         put_cred(data->cred);
10055         nfs_iput_and_deactive(data->inode);
10056         kfree(data);
10057 }
10058
10059 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10060         .rpc_call_prepare = nfs4_layoutcommit_prepare,
10061         .rpc_call_done = nfs4_layoutcommit_done,
10062         .rpc_release = nfs4_layoutcommit_release,
10063 };
10064
10065 int
10066 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10067 {
10068         struct rpc_message msg = {
10069                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10070                 .rpc_argp = &data->args,
10071                 .rpc_resp = &data->res,
10072                 .rpc_cred = data->cred,
10073         };
10074         struct rpc_task_setup task_setup_data = {
10075                 .task = &data->task,
10076                 .rpc_client = NFS_CLIENT(data->args.inode),
10077                 .rpc_message = &msg,
10078                 .callback_ops = &nfs4_layoutcommit_ops,
10079                 .callback_data = data,
10080                 .flags = RPC_TASK_MOVEABLE,
10081         };
10082         struct rpc_task *task;
10083         int status = 0;
10084
10085         dprintk("NFS: initiating layoutcommit call. sync %d "
10086                 "lbw: %llu inode %lu\n", sync,
10087                 data->args.lastbytewritten,
10088                 data->args.inode->i_ino);
10089
10090         if (!sync) {
10091                 data->inode = nfs_igrab_and_active(data->args.inode);
10092                 if (data->inode == NULL) {
10093                         nfs4_layoutcommit_release(data);
10094                         return -EAGAIN;
10095                 }
10096                 task_setup_data.flags = RPC_TASK_ASYNC;
10097         }
10098         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10099         task = rpc_run_task(&task_setup_data);
10100         if (IS_ERR(task))
10101                 return PTR_ERR(task);
10102         if (sync)
10103                 status = task->tk_status;
10104         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10105         dprintk("%s: status %d\n", __func__, status);
10106         rpc_put_task(task);
10107         return status;
10108 }
10109
10110 /*
10111  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10112  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10113  */
10114 static int
10115 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10116                     struct nfs_fsinfo *info,
10117                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10118 {
10119         struct nfs41_secinfo_no_name_args args = {
10120                 .style = SECINFO_STYLE_CURRENT_FH,
10121         };
10122         struct nfs4_secinfo_res res = {
10123                 .flavors = flavors,
10124         };
10125         struct rpc_message msg = {
10126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10127                 .rpc_argp = &args,
10128                 .rpc_resp = &res,
10129         };
10130         struct nfs4_call_sync_data data = {
10131                 .seq_server = server,
10132                 .seq_args = &args.seq_args,
10133                 .seq_res = &res.seq_res,
10134         };
10135         struct rpc_task_setup task_setup = {
10136                 .rpc_client = server->client,
10137                 .rpc_message = &msg,
10138                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10139                 .callback_data = &data,
10140                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10141         };
10142         const struct cred *cred = NULL;
10143         int status;
10144
10145         if (use_integrity) {
10146                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10147
10148                 cred = nfs4_get_clid_cred(server->nfs_client);
10149                 msg.rpc_cred = cred;
10150         }
10151
10152         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10153         status = nfs4_call_sync_custom(&task_setup);
10154         dprintk("<-- %s status=%d\n", __func__, status);
10155
10156         put_cred(cred);
10157
10158         return status;
10159 }
10160
10161 static int
10162 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10163                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10164 {
10165         struct nfs4_exception exception = {
10166                 .interruptible = true,
10167         };
10168         int err;
10169         do {
10170                 /* first try using integrity protection */
10171                 err = -NFS4ERR_WRONGSEC;
10172
10173                 /* try to use integrity protection with machine cred */
10174                 if (_nfs4_is_integrity_protected(server->nfs_client))
10175                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10176                                                           flavors, true);
10177
10178                 /*
10179                  * if unable to use integrity protection, or SECINFO with
10180                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10181                  * disallowed by spec, but exists in deployed servers) use
10182                  * the current filesystem's rpc_client and the user cred.
10183                  */
10184                 if (err == -NFS4ERR_WRONGSEC)
10185                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10186                                                           flavors, false);
10187
10188                 switch (err) {
10189                 case 0:
10190                 case -NFS4ERR_WRONGSEC:
10191                 case -ENOTSUPP:
10192                         goto out;
10193                 default:
10194                         err = nfs4_handle_exception(server, err, &exception);
10195                 }
10196         } while (exception.retry);
10197 out:
10198         return err;
10199 }
10200
10201 static int
10202 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10203                     struct nfs_fsinfo *info)
10204 {
10205         int err;
10206         struct page *page;
10207         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10208         struct nfs4_secinfo_flavors *flavors;
10209         struct nfs4_secinfo4 *secinfo;
10210         int i;
10211
10212         page = alloc_page(GFP_KERNEL);
10213         if (!page) {
10214                 err = -ENOMEM;
10215                 goto out;
10216         }
10217
10218         flavors = page_address(page);
10219         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10220
10221         /*
10222          * Fall back on "guess and check" method if
10223          * the server doesn't support SECINFO_NO_NAME
10224          */
10225         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10226                 err = nfs4_find_root_sec(server, fhandle, info);
10227                 goto out_freepage;
10228         }
10229         if (err)
10230                 goto out_freepage;
10231
10232         for (i = 0; i < flavors->num_flavors; i++) {
10233                 secinfo = &flavors->flavors[i];
10234
10235                 switch (secinfo->flavor) {
10236                 case RPC_AUTH_NULL:
10237                 case RPC_AUTH_UNIX:
10238                 case RPC_AUTH_GSS:
10239                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10240                                         &secinfo->flavor_info);
10241                         break;
10242                 default:
10243                         flavor = RPC_AUTH_MAXFLAVOR;
10244                         break;
10245                 }
10246
10247                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10248                         flavor = RPC_AUTH_MAXFLAVOR;
10249
10250                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10251                         err = nfs4_lookup_root_sec(server, fhandle,
10252                                                    info, flavor);
10253                         if (!err)
10254                                 break;
10255                 }
10256         }
10257
10258         if (flavor == RPC_AUTH_MAXFLAVOR)
10259                 err = -EPERM;
10260
10261 out_freepage:
10262         put_page(page);
10263         if (err == -EACCES)
10264                 return -EPERM;
10265 out:
10266         return err;
10267 }
10268
10269 static int _nfs41_test_stateid(struct nfs_server *server,
10270                 nfs4_stateid *stateid,
10271                 const struct cred *cred)
10272 {
10273         int status;
10274         struct nfs41_test_stateid_args args = {
10275                 .stateid = stateid,
10276         };
10277         struct nfs41_test_stateid_res res;
10278         struct rpc_message msg = {
10279                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10280                 .rpc_argp = &args,
10281                 .rpc_resp = &res,
10282                 .rpc_cred = cred,
10283         };
10284         struct rpc_clnt *rpc_client = server->client;
10285
10286         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10287                 &rpc_client, &msg);
10288
10289         dprintk("NFS call  test_stateid %p\n", stateid);
10290         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10291         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10292                         &args.seq_args, &res.seq_res);
10293         if (status != NFS_OK) {
10294                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10295                 return status;
10296         }
10297         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10298         return -res.status;
10299 }
10300
10301 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10302                 int err, struct nfs4_exception *exception)
10303 {
10304         exception->retry = 0;
10305         switch(err) {
10306         case -NFS4ERR_DELAY:
10307         case -NFS4ERR_RETRY_UNCACHED_REP:
10308                 nfs4_handle_exception(server, err, exception);
10309                 break;
10310         case -NFS4ERR_BADSESSION:
10311         case -NFS4ERR_BADSLOT:
10312         case -NFS4ERR_BAD_HIGH_SLOT:
10313         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10314         case -NFS4ERR_DEADSESSION:
10315                 nfs4_do_handle_exception(server, err, exception);
10316         }
10317 }
10318
10319 /**
10320  * nfs41_test_stateid - perform a TEST_STATEID operation
10321  *
10322  * @server: server / transport on which to perform the operation
10323  * @stateid: state ID to test
10324  * @cred: credential
10325  *
10326  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10327  * Otherwise a negative NFS4ERR value is returned if the operation
10328  * failed or the state ID is not currently valid.
10329  */
10330 static int nfs41_test_stateid(struct nfs_server *server,
10331                 nfs4_stateid *stateid,
10332                 const struct cred *cred)
10333 {
10334         struct nfs4_exception exception = {
10335                 .interruptible = true,
10336         };
10337         int err;
10338         do {
10339                 err = _nfs41_test_stateid(server, stateid, cred);
10340                 nfs4_handle_delay_or_session_error(server, err, &exception);
10341         } while (exception.retry);
10342         return err;
10343 }
10344
10345 struct nfs_free_stateid_data {
10346         struct nfs_server *server;
10347         struct nfs41_free_stateid_args args;
10348         struct nfs41_free_stateid_res res;
10349 };
10350
10351 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10352 {
10353         struct nfs_free_stateid_data *data = calldata;
10354         nfs4_setup_sequence(data->server->nfs_client,
10355                         &data->args.seq_args,
10356                         &data->res.seq_res,
10357                         task);
10358 }
10359
10360 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10361 {
10362         struct nfs_free_stateid_data *data = calldata;
10363
10364         nfs41_sequence_done(task, &data->res.seq_res);
10365
10366         switch (task->tk_status) {
10367         case -NFS4ERR_DELAY:
10368                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10369                         rpc_restart_call_prepare(task);
10370         }
10371 }
10372
10373 static void nfs41_free_stateid_release(void *calldata)
10374 {
10375         struct nfs_free_stateid_data *data = calldata;
10376         struct nfs_client *clp = data->server->nfs_client;
10377
10378         nfs_put_client(clp);
10379         kfree(calldata);
10380 }
10381
10382 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10383         .rpc_call_prepare = nfs41_free_stateid_prepare,
10384         .rpc_call_done = nfs41_free_stateid_done,
10385         .rpc_release = nfs41_free_stateid_release,
10386 };
10387
10388 /**
10389  * nfs41_free_stateid - perform a FREE_STATEID operation
10390  *
10391  * @server: server / transport on which to perform the operation
10392  * @stateid: state ID to release
10393  * @cred: credential
10394  * @privileged: set to true if this call needs to be privileged
10395  *
10396  * Note: this function is always asynchronous.
10397  */
10398 static int nfs41_free_stateid(struct nfs_server *server,
10399                 const nfs4_stateid *stateid,
10400                 const struct cred *cred,
10401                 bool privileged)
10402 {
10403         struct rpc_message msg = {
10404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10405                 .rpc_cred = cred,
10406         };
10407         struct rpc_task_setup task_setup = {
10408                 .rpc_client = server->client,
10409                 .rpc_message = &msg,
10410                 .callback_ops = &nfs41_free_stateid_ops,
10411                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10412         };
10413         struct nfs_free_stateid_data *data;
10414         struct rpc_task *task;
10415         struct nfs_client *clp = server->nfs_client;
10416
10417         if (!refcount_inc_not_zero(&clp->cl_count))
10418                 return -EIO;
10419
10420         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10421                 &task_setup.rpc_client, &msg);
10422
10423         dprintk("NFS call  free_stateid %p\n", stateid);
10424         data = kmalloc(sizeof(*data), GFP_KERNEL);
10425         if (!data)
10426                 return -ENOMEM;
10427         data->server = server;
10428         nfs4_stateid_copy(&data->args.stateid, stateid);
10429
10430         task_setup.callback_data = data;
10431
10432         msg.rpc_argp = &data->args;
10433         msg.rpc_resp = &data->res;
10434         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10435         task = rpc_run_task(&task_setup);
10436         if (IS_ERR(task))
10437                 return PTR_ERR(task);
10438         rpc_put_task(task);
10439         return 0;
10440 }
10441
10442 static void
10443 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10444 {
10445         const struct cred *cred = lsp->ls_state->owner->so_cred;
10446
10447         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10448         nfs4_free_lock_state(server, lsp);
10449 }
10450
10451 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10452                 const nfs4_stateid *s2)
10453 {
10454         if (s1->type != s2->type)
10455                 return false;
10456
10457         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10458                 return false;
10459
10460         if (s1->seqid == s2->seqid)
10461                 return true;
10462
10463         return s1->seqid == 0 || s2->seqid == 0;
10464 }
10465
10466 #endif /* CONFIG_NFS_V4_1 */
10467
10468 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10469                 const nfs4_stateid *s2)
10470 {
10471         return nfs4_stateid_match(s1, s2);
10472 }
10473
10474
10475 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10476         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10477         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10478         .recover_open   = nfs4_open_reclaim,
10479         .recover_lock   = nfs4_lock_reclaim,
10480         .establish_clid = nfs4_init_clientid,
10481         .detect_trunking = nfs40_discover_server_trunking,
10482 };
10483
10484 #if defined(CONFIG_NFS_V4_1)
10485 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10486         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10487         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10488         .recover_open   = nfs4_open_reclaim,
10489         .recover_lock   = nfs4_lock_reclaim,
10490         .establish_clid = nfs41_init_clientid,
10491         .reclaim_complete = nfs41_proc_reclaim_complete,
10492         .detect_trunking = nfs41_discover_server_trunking,
10493 };
10494 #endif /* CONFIG_NFS_V4_1 */
10495
10496 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10497         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10498         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10499         .recover_open   = nfs40_open_expired,
10500         .recover_lock   = nfs4_lock_expired,
10501         .establish_clid = nfs4_init_clientid,
10502 };
10503
10504 #if defined(CONFIG_NFS_V4_1)
10505 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10506         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10507         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10508         .recover_open   = nfs41_open_expired,
10509         .recover_lock   = nfs41_lock_expired,
10510         .establish_clid = nfs41_init_clientid,
10511 };
10512 #endif /* CONFIG_NFS_V4_1 */
10513
10514 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10515         .sched_state_renewal = nfs4_proc_async_renew,
10516         .get_state_renewal_cred = nfs4_get_renew_cred,
10517         .renew_lease = nfs4_proc_renew,
10518 };
10519
10520 #if defined(CONFIG_NFS_V4_1)
10521 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10522         .sched_state_renewal = nfs41_proc_async_sequence,
10523         .get_state_renewal_cred = nfs4_get_machine_cred,
10524         .renew_lease = nfs4_proc_sequence,
10525 };
10526 #endif
10527
10528 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10529         .get_locations = _nfs40_proc_get_locations,
10530         .fsid_present = _nfs40_proc_fsid_present,
10531 };
10532
10533 #if defined(CONFIG_NFS_V4_1)
10534 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10535         .get_locations = _nfs41_proc_get_locations,
10536         .fsid_present = _nfs41_proc_fsid_present,
10537 };
10538 #endif  /* CONFIG_NFS_V4_1 */
10539
10540 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10541         .minor_version = 0,
10542         .init_caps = NFS_CAP_READDIRPLUS
10543                 | NFS_CAP_ATOMIC_OPEN
10544                 | NFS_CAP_POSIX_LOCK,
10545         .init_client = nfs40_init_client,
10546         .shutdown_client = nfs40_shutdown_client,
10547         .match_stateid = nfs4_match_stateid,
10548         .find_root_sec = nfs4_find_root_sec,
10549         .free_lock_state = nfs4_release_lockowner,
10550         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10551         .alloc_seqid = nfs_alloc_seqid,
10552         .call_sync_ops = &nfs40_call_sync_ops,
10553         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10554         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10555         .state_renewal_ops = &nfs40_state_renewal_ops,
10556         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10557 };
10558
10559 #if defined(CONFIG_NFS_V4_1)
10560 static struct nfs_seqid *
10561 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10562 {
10563         return NULL;
10564 }
10565
10566 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10567         .minor_version = 1,
10568         .init_caps = NFS_CAP_READDIRPLUS
10569                 | NFS_CAP_ATOMIC_OPEN
10570                 | NFS_CAP_POSIX_LOCK
10571                 | NFS_CAP_STATEID_NFSV41
10572                 | NFS_CAP_ATOMIC_OPEN_V1
10573                 | NFS_CAP_LGOPEN
10574                 | NFS_CAP_MOVEABLE,
10575         .init_client = nfs41_init_client,
10576         .shutdown_client = nfs41_shutdown_client,
10577         .match_stateid = nfs41_match_stateid,
10578         .find_root_sec = nfs41_find_root_sec,
10579         .free_lock_state = nfs41_free_lock_state,
10580         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10581         .alloc_seqid = nfs_alloc_no_seqid,
10582         .session_trunk = nfs4_test_session_trunk,
10583         .call_sync_ops = &nfs41_call_sync_ops,
10584         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10585         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10586         .state_renewal_ops = &nfs41_state_renewal_ops,
10587         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10588 };
10589 #endif
10590
10591 #if defined(CONFIG_NFS_V4_2)
10592 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10593         .minor_version = 2,
10594         .init_caps = NFS_CAP_READDIRPLUS
10595                 | NFS_CAP_ATOMIC_OPEN
10596                 | NFS_CAP_POSIX_LOCK
10597                 | NFS_CAP_STATEID_NFSV41
10598                 | NFS_CAP_ATOMIC_OPEN_V1
10599                 | NFS_CAP_LGOPEN
10600                 | NFS_CAP_ALLOCATE
10601                 | NFS_CAP_COPY
10602                 | NFS_CAP_OFFLOAD_CANCEL
10603                 | NFS_CAP_COPY_NOTIFY
10604                 | NFS_CAP_DEALLOCATE
10605                 | NFS_CAP_SEEK
10606                 | NFS_CAP_LAYOUTSTATS
10607                 | NFS_CAP_CLONE
10608                 | NFS_CAP_LAYOUTERROR
10609                 | NFS_CAP_READ_PLUS
10610                 | NFS_CAP_MOVEABLE,
10611         .init_client = nfs41_init_client,
10612         .shutdown_client = nfs41_shutdown_client,
10613         .match_stateid = nfs41_match_stateid,
10614         .find_root_sec = nfs41_find_root_sec,
10615         .free_lock_state = nfs41_free_lock_state,
10616         .call_sync_ops = &nfs41_call_sync_ops,
10617         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10618         .alloc_seqid = nfs_alloc_no_seqid,
10619         .session_trunk = nfs4_test_session_trunk,
10620         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10621         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10622         .state_renewal_ops = &nfs41_state_renewal_ops,
10623         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10624 };
10625 #endif
10626
10627 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10628         [0] = &nfs_v4_0_minor_ops,
10629 #if defined(CONFIG_NFS_V4_1)
10630         [1] = &nfs_v4_1_minor_ops,
10631 #endif
10632 #if defined(CONFIG_NFS_V4_2)
10633         [2] = &nfs_v4_2_minor_ops,
10634 #endif
10635 };
10636
10637 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10638 {
10639         ssize_t error, error2, error3;
10640         size_t left = size;
10641
10642         error = generic_listxattr(dentry, list, left);
10643         if (error < 0)
10644                 return error;
10645         if (list) {
10646                 list += error;
10647                 left -= error;
10648         }
10649
10650         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left);
10651         if (error2 < 0)
10652                 return error2;
10653
10654         if (list) {
10655                 list += error2;
10656                 left -= error2;
10657         }
10658
10659         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10660         if (error3 < 0)
10661                 return error3;
10662
10663         error += error2 + error3;
10664         if (size && error > size)
10665                 return -ERANGE;
10666         return error;
10667 }
10668
10669 static void nfs4_enable_swap(struct inode *inode)
10670 {
10671         /* The state manager thread must always be running.
10672          * It will notice the client is a swapper, and stay put.
10673          */
10674         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10675
10676         nfs4_schedule_state_manager(clp);
10677 }
10678
10679 static void nfs4_disable_swap(struct inode *inode)
10680 {
10681         /* The state manager thread will now exit once it is
10682          * woken.
10683          */
10684         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10685
10686         set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10687         clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10688         wake_up_var(&clp->cl_state);
10689 }
10690
10691 static const struct inode_operations nfs4_dir_inode_operations = {
10692         .create         = nfs_create,
10693         .lookup         = nfs_lookup,
10694         .atomic_open    = nfs_atomic_open,
10695         .link           = nfs_link,
10696         .unlink         = nfs_unlink,
10697         .symlink        = nfs_symlink,
10698         .mkdir          = nfs_mkdir,
10699         .rmdir          = nfs_rmdir,
10700         .mknod          = nfs_mknod,
10701         .rename         = nfs_rename,
10702         .permission     = nfs_permission,
10703         .getattr        = nfs_getattr,
10704         .setattr        = nfs_setattr,
10705         .listxattr      = nfs4_listxattr,
10706 };
10707
10708 static const struct inode_operations nfs4_file_inode_operations = {
10709         .permission     = nfs_permission,
10710         .getattr        = nfs_getattr,
10711         .setattr        = nfs_setattr,
10712         .listxattr      = nfs4_listxattr,
10713 };
10714
10715 const struct nfs_rpc_ops nfs_v4_clientops = {
10716         .version        = 4,                    /* protocol version */
10717         .dentry_ops     = &nfs4_dentry_operations,
10718         .dir_inode_ops  = &nfs4_dir_inode_operations,
10719         .file_inode_ops = &nfs4_file_inode_operations,
10720         .file_ops       = &nfs4_file_operations,
10721         .getroot        = nfs4_proc_get_root,
10722         .submount       = nfs4_submount,
10723         .try_get_tree   = nfs4_try_get_tree,
10724         .getattr        = nfs4_proc_getattr,
10725         .setattr        = nfs4_proc_setattr,
10726         .lookup         = nfs4_proc_lookup,
10727         .lookupp        = nfs4_proc_lookupp,
10728         .access         = nfs4_proc_access,
10729         .readlink       = nfs4_proc_readlink,
10730         .create         = nfs4_proc_create,
10731         .remove         = nfs4_proc_remove,
10732         .unlink_setup   = nfs4_proc_unlink_setup,
10733         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10734         .unlink_done    = nfs4_proc_unlink_done,
10735         .rename_setup   = nfs4_proc_rename_setup,
10736         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10737         .rename_done    = nfs4_proc_rename_done,
10738         .link           = nfs4_proc_link,
10739         .symlink        = nfs4_proc_symlink,
10740         .mkdir          = nfs4_proc_mkdir,
10741         .rmdir          = nfs4_proc_rmdir,
10742         .readdir        = nfs4_proc_readdir,
10743         .mknod          = nfs4_proc_mknod,
10744         .statfs         = nfs4_proc_statfs,
10745         .fsinfo         = nfs4_proc_fsinfo,
10746         .pathconf       = nfs4_proc_pathconf,
10747         .set_capabilities = nfs4_server_capabilities,
10748         .decode_dirent  = nfs4_decode_dirent,
10749         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10750         .read_setup     = nfs4_proc_read_setup,
10751         .read_done      = nfs4_read_done,
10752         .write_setup    = nfs4_proc_write_setup,
10753         .write_done     = nfs4_write_done,
10754         .commit_setup   = nfs4_proc_commit_setup,
10755         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10756         .commit_done    = nfs4_commit_done,
10757         .lock           = nfs4_proc_lock,
10758         .clear_acl_cache = nfs4_zap_acl_attr,
10759         .close_context  = nfs4_close_context,
10760         .open_context   = nfs4_atomic_open,
10761         .have_delegation = nfs4_have_delegation,
10762         .alloc_client   = nfs4_alloc_client,
10763         .init_client    = nfs4_init_client,
10764         .free_client    = nfs4_free_client,
10765         .create_server  = nfs4_create_server,
10766         .clone_server   = nfs_clone_server,
10767         .discover_trunking = nfs4_discover_trunking,
10768         .enable_swap    = nfs4_enable_swap,
10769         .disable_swap   = nfs4_disable_swap,
10770 };
10771
10772 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10773         .name   = XATTR_NAME_NFSV4_ACL,
10774         .list   = nfs4_xattr_list_nfs4_acl,
10775         .get    = nfs4_xattr_get_nfs4_acl,
10776         .set    = nfs4_xattr_set_nfs4_acl,
10777 };
10778
10779 #if defined(CONFIG_NFS_V4_1)
10780 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10781         .name   = XATTR_NAME_NFSV4_DACL,
10782         .list   = nfs4_xattr_list_nfs4_dacl,
10783         .get    = nfs4_xattr_get_nfs4_dacl,
10784         .set    = nfs4_xattr_set_nfs4_dacl,
10785 };
10786
10787 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10788         .name   = XATTR_NAME_NFSV4_SACL,
10789         .list   = nfs4_xattr_list_nfs4_sacl,
10790         .get    = nfs4_xattr_get_nfs4_sacl,
10791         .set    = nfs4_xattr_set_nfs4_sacl,
10792 };
10793 #endif
10794
10795 #ifdef CONFIG_NFS_V4_2
10796 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10797         .prefix = XATTR_USER_PREFIX,
10798         .get    = nfs4_xattr_get_nfs4_user,
10799         .set    = nfs4_xattr_set_nfs4_user,
10800 };
10801 #endif
10802
10803 const struct xattr_handler * const nfs4_xattr_handlers[] = {
10804         &nfs4_xattr_nfs4_acl_handler,
10805 #if defined(CONFIG_NFS_V4_1)
10806         &nfs4_xattr_nfs4_dacl_handler,
10807         &nfs4_xattr_nfs4_sacl_handler,
10808 #endif
10809 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10810         &nfs4_xattr_nfs4_label_handler,
10811 #endif
10812 #ifdef CONFIG_NFS_V4_2
10813         &nfs4_xattr_nfs4_user_handler,
10814 #endif
10815         NULL
10816 };