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                 return -EREMOTEIO;
 174         case -NFS4ERR_WRONGSEC:
 175         case -NFS4ERR_WRONG_CRED:
 176                 return -EPERM;
 177         case -NFS4ERR_BADOWNER:
 178         case -NFS4ERR_BADNAME:
 179                 return -EINVAL;
 180         case -NFS4ERR_SHARE_DENIED:
 181                 return -EACCES;
 182         case -NFS4ERR_MINOR_VERS_MISMATCH:
 183                 return -EPROTONOSUPPORT;
 184         case -NFS4ERR_FILE_OPEN:
 185                 return -EBUSY;
 186         case -NFS4ERR_NOT_SAME:
 187                 return -ENOTSYNC;
 188         default:
 189                 dprintk("%s could not handle NFSv4 error %d\n",
 190                                 __func__, -err);
 191                 break;
 192         }
 193         return -EIO;
 194 }
 195
 196 /*
 197  * This is our standard bitmap for GETATTR requests.
 198  */
 199 const u32 nfs4_fattr_bitmap[3] = {
 200         FATTR4_WORD0_TYPE
 201         | FATTR4_WORD0_CHANGE
 202         | FATTR4_WORD0_SIZE
 203         | FATTR4_WORD0_FSID
 204         | FATTR4_WORD0_FILEID,
 205         FATTR4_WORD1_MODE
 206         | FATTR4_WORD1_NUMLINKS
 207         | FATTR4_WORD1_OWNER
 208         | FATTR4_WORD1_OWNER_GROUP
 209         | FATTR4_WORD1_RAWDEV
 210         | FATTR4_WORD1_SPACE_USED
 211         | FATTR4_WORD1_TIME_ACCESS
 212         | FATTR4_WORD1_TIME_METADATA
 213         | FATTR4_WORD1_TIME_MODIFY
 214         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 215 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 216         FATTR4_WORD2_SECURITY_LABEL
 217 #endif
 218 };
 219
 220 static const u32 nfs4_pnfs_open_bitmap[3] = {
 221         FATTR4_WORD0_TYPE
 222         | FATTR4_WORD0_CHANGE
 223         | FATTR4_WORD0_SIZE
 224         | FATTR4_WORD0_FSID
 225         | FATTR4_WORD0_FILEID,
 226         FATTR4_WORD1_MODE
 227         | FATTR4_WORD1_NUMLINKS
 228         | FATTR4_WORD1_OWNER
 229         | FATTR4_WORD1_OWNER_GROUP
 230         | FATTR4_WORD1_RAWDEV
 231         | FATTR4_WORD1_SPACE_USED
 232         | FATTR4_WORD1_TIME_ACCESS
 233         | FATTR4_WORD1_TIME_METADATA
 234         | FATTR4_WORD1_TIME_MODIFY,
 235         FATTR4_WORD2_MDSTHRESHOLD
 236 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 237         | FATTR4_WORD2_SECURITY_LABEL
 238 #endif
 239 };
 240
 241 static const u32 nfs4_open_noattr_bitmap[3] = {
 242         FATTR4_WORD0_TYPE
 243         | FATTR4_WORD0_FILEID,
 244 };
 245
 246 const u32 nfs4_statfs_bitmap[3] = {
 247         FATTR4_WORD0_FILES_AVAIL
 248         | FATTR4_WORD0_FILES_FREE
 249         | FATTR4_WORD0_FILES_TOTAL,
 250         FATTR4_WORD1_SPACE_AVAIL
 251         | FATTR4_WORD1_SPACE_FREE
 252         | FATTR4_WORD1_SPACE_TOTAL
 253 };
 254
 255 const u32 nfs4_pathconf_bitmap[3] = {
 256         FATTR4_WORD0_MAXLINK
 257         | FATTR4_WORD0_MAXNAME,
 258         0
 259 };
 260
 261 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 262                         | FATTR4_WORD0_MAXREAD
 263                         | FATTR4_WORD0_MAXWRITE
 264                         | FATTR4_WORD0_LEASE_TIME,
 265                         FATTR4_WORD1_TIME_DELTA
 266                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 267                         FATTR4_WORD2_LAYOUT_BLKSIZE
 268                         | FATTR4_WORD2_CLONE_BLKSIZE
 269                         | FATTR4_WORD2_CHANGE_ATTR_TYPE
 270                         | FATTR4_WORD2_XATTR_SUPPORT
 271 };
 272
 273 const u32 nfs4_fs_locations_bitmap[3] = {
 274         FATTR4_WORD0_CHANGE
 275         | FATTR4_WORD0_SIZE
 276         | FATTR4_WORD0_FSID
 277         | FATTR4_WORD0_FILEID
 278         | FATTR4_WORD0_FS_LOCATIONS,
 279         FATTR4_WORD1_OWNER
 280         | FATTR4_WORD1_OWNER_GROUP
 281         | FATTR4_WORD1_RAWDEV
 282         | FATTR4_WORD1_SPACE_USED
 283         | FATTR4_WORD1_TIME_ACCESS
 284         | FATTR4_WORD1_TIME_METADATA
 285         | FATTR4_WORD1_TIME_MODIFY
 286         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 287 };
 288
 289 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 290                                     struct inode *inode, unsigned long flags)
 291 {
 292         unsigned long cache_validity;
 293
 294         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 295         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 296                 return;
 297
 298         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
 299
 300         /* Remove the attributes over which we have full control */
 301         dst[1] &= ~FATTR4_WORD1_RAWDEV;
 302         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 303                 dst[0] &= ~FATTR4_WORD0_SIZE;
 304
 305         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 306                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 307
 308         if (!(cache_validity & NFS_INO_INVALID_MODE))
 309                 dst[1] &= ~FATTR4_WORD1_MODE;
 310         if (!(cache_validity & NFS_INO_INVALID_OTHER))
 311                 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
 312 }
 313
 314 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 315                 struct nfs4_readdir_arg *readdir)
 316 {
 317         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 318         __be32 *start, *p;
 319
 320         if (cookie > 2) {
 321                 readdir->cookie = cookie;
 322                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 323                 return;
 324         }
 325
 326         readdir->cookie = 0;
 327         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 328         if (cookie == 2)
 329                 return;
 330
 331         /*
 332          * NFSv4 servers do not return entries for '.' and '..'
 333          * Therefore, we fake these entries here.  We let '.'
 334          * have cookie 0 and '..' have cookie 1.  Note that
 335          * when talking to the server, we always send cookie 0
 336          * instead of 1 or 2.
 337          */
 338         start = p = kmap_atomic(*readdir->pages);
 339
 340         if (cookie == 0) {
 341                 *p++ = xdr_one;                                  /* next */
 342                 *p++ = xdr_zero;                   /* cookie, first word */
 343                 *p++ = xdr_one;                   /* cookie, second word */
 344                 *p++ = xdr_one;                             /* entry len */
 345                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 346                 p++;
 347                 *p++ = xdr_one;                         /* bitmap length */
 348                 *p++ = htonl(attrs);                           /* bitmap */
 349                 *p++ = htonl(12);             /* attribute buffer length */
 350                 *p++ = htonl(NF4DIR);
 351                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 352         }
 353
 354         *p++ = xdr_one;                                  /* next */
 355         *p++ = xdr_zero;                   /* cookie, first word */
 356         *p++ = xdr_two;                   /* cookie, second word */
 357         *p++ = xdr_two;                             /* entry len */
 358         memcpy(p, "..\0\0", 4);                         /* entry */
 359         p++;
 360         *p++ = xdr_one;                         /* bitmap length */
 361         *p++ = htonl(attrs);                           /* bitmap */
 362         *p++ = htonl(12);             /* attribute buffer length */
 363         *p++ = htonl(NF4DIR);
 364         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 365
 366         readdir->pgbase = (char *)p - (char *)start;
 367         readdir->count -= readdir->pgbase;
 368         kunmap_atomic(start);
 369 }
 370
 371 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 372 {
 373         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 374                 fattr->pre_change_attr = version;
 375                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 376         }
 377 }
 378
 379 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 380                 nfs4_stateid *stateid,
 381                 const struct cred *cred)
 382 {
 383         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 384
 385         ops->test_and_free_expired(server, stateid, cred);
 386 }
 387
 388 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 389                 nfs4_stateid *stateid,
 390                 const struct cred *cred)
 391 {
 392         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 393         nfs4_test_and_free_stateid(server, stateid, cred);
 394 }
 395
 396 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 397                 const nfs4_stateid *stateid,
 398                 const struct cred *cred)
 399 {
 400         nfs4_stateid tmp;
 401
 402         nfs4_stateid_copy(&tmp, stateid);
 403         __nfs4_free_revoked_stateid(server, &tmp, cred);
 404 }
 405
 406 static long nfs4_update_delay(long *timeout)
 407 {
 408         long ret;
 409         if (!timeout)
 410                 return NFS4_POLL_RETRY_MAX;
 411         if (*timeout <= 0)
 412                 *timeout = NFS4_POLL_RETRY_MIN;
 413         if (*timeout > NFS4_POLL_RETRY_MAX)
 414                 *timeout = NFS4_POLL_RETRY_MAX;
 415         ret = *timeout;
 416         *timeout <<= 1;
 417         return ret;
 418 }
 419
 420 static int nfs4_delay_killable(long *timeout)
 421 {
 422         might_sleep();
 423
 424         __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
 425         schedule_timeout(nfs4_update_delay(timeout));
 426         if (!__fatal_signal_pending(current))
 427                 return 0;
 428         return -EINTR;
 429 }
 430
 431 static int nfs4_delay_interruptible(long *timeout)
 432 {
 433         might_sleep();
 434
 435         __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
 436         schedule_timeout(nfs4_update_delay(timeout));
 437         if (!signal_pending(current))
 438                 return 0;
 439         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 440 }
 441
 442 static int nfs4_delay(long *timeout, bool interruptible)
 443 {
 444         if (interruptible)
 445                 return nfs4_delay_interruptible(timeout);
 446         return nfs4_delay_killable(timeout);
 447 }
 448
 449 static const nfs4_stateid *
 450 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 451 {
 452         if (!stateid)
 453                 return NULL;
 454         switch (stateid->type) {
 455         case NFS4_OPEN_STATEID_TYPE:
 456         case NFS4_LOCK_STATEID_TYPE:
 457         case NFS4_DELEGATION_STATEID_TYPE:
 458                 return stateid;
 459         default:
 460                 break;
 461         }
 462         return NULL;
 463 }
 464
 465 /* This is the error handling routine for processes that are allowed
 466  * to sleep.
 467  */
 468 static int nfs4_do_handle_exception(struct nfs_server *server,
 469                 int errorcode, struct nfs4_exception *exception)
 470 {
 471         struct nfs_client *clp = server->nfs_client;
 472         struct nfs4_state *state = exception->state;
 473         const nfs4_stateid *stateid;
 474         struct inode *inode = exception->inode;
 475         int ret = errorcode;
 476
 477         exception->delay = 0;
 478         exception->recovering = 0;
 479         exception->retry = 0;
 480
 481         stateid = nfs4_recoverable_stateid(exception->stateid);
 482         if (stateid == NULL && state != NULL)
 483                 stateid = nfs4_recoverable_stateid(&state->stateid);
 484
 485         switch(errorcode) {
 486                 case 0:
 487                         return 0;
 488                 case -NFS4ERR_BADHANDLE:
 489                 case -ESTALE:
 490                         if (inode != NULL && S_ISREG(inode->i_mode))
 491                                 pnfs_destroy_layout(NFS_I(inode));
 492                         break;
 493                 case -NFS4ERR_DELEG_REVOKED:
 494                 case -NFS4ERR_ADMIN_REVOKED:
 495                 case -NFS4ERR_EXPIRED:
 496                 case -NFS4ERR_BAD_STATEID:
 497                 case -NFS4ERR_PARTNER_NO_AUTH:
 498                         if (inode != NULL && stateid != NULL) {
 499                                 nfs_inode_find_state_and_recover(inode,
 500                                                 stateid);
 501                                 goto wait_on_recovery;
 502                         }
 503                         fallthrough;
 504                 case -NFS4ERR_OPENMODE:
 505                         if (inode) {
 506                                 int err;
 507
 508                                 err = nfs_async_inode_return_delegation(inode,
 509                                                 stateid);
 510                                 if (err == 0)
 511                                         goto wait_on_recovery;
 512                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 513                                         exception->retry = 1;
 514                                         break;
 515                                 }
 516                         }
 517                         if (state == NULL)
 518                                 break;
 519                         ret = nfs4_schedule_stateid_recovery(server, state);
 520                         if (ret < 0)
 521                                 break;
 522                         goto wait_on_recovery;
 523                 case -NFS4ERR_STALE_STATEID:
 524                 case -NFS4ERR_STALE_CLIENTID:
 525                         nfs4_schedule_lease_recovery(clp);
 526                         goto wait_on_recovery;
 527                 case -NFS4ERR_MOVED:
 528                         ret = nfs4_schedule_migration_recovery(server);
 529                         if (ret < 0)
 530                                 break;
 531                         goto wait_on_recovery;
 532                 case -NFS4ERR_LEASE_MOVED:
 533                         nfs4_schedule_lease_moved_recovery(clp);
 534                         goto wait_on_recovery;
 535 #if defined(CONFIG_NFS_V4_1)
 536                 case -NFS4ERR_BADSESSION:
 537                 case -NFS4ERR_BADSLOT:
 538                 case -NFS4ERR_BAD_HIGH_SLOT:
 539                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 540                 case -NFS4ERR_DEADSESSION:
 541                 case -NFS4ERR_SEQ_FALSE_RETRY:
 542                 case -NFS4ERR_SEQ_MISORDERED:
 543                         /* Handled in nfs41_sequence_process() */
 544                         goto wait_on_recovery;
 545 #endif /* defined(CONFIG_NFS_V4_1) */
 546                 case -NFS4ERR_FILE_OPEN:
 547                         if (exception->timeout > HZ) {
 548                                 /* We have retried a decent amount, time to
 549                                  * fail
 550                                  */
 551                                 ret = -EBUSY;
 552                                 break;
 553                         }
 554                         fallthrough;
 555                 case -NFS4ERR_DELAY:
 556                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 557                         fallthrough;
 558                 case -NFS4ERR_GRACE:
 559                 case -NFS4ERR_LAYOUTTRYLATER:
 560                 case -NFS4ERR_RECALLCONFLICT:
 561                         exception->delay = 1;
 562                         return 0;
 563
 564                 case -NFS4ERR_RETRY_UNCACHED_REP:
 565                 case -NFS4ERR_OLD_STATEID:
 566                         exception->retry = 1;
 567                         break;
 568                 case -NFS4ERR_BADOWNER:
 569                         /* The following works around a Linux server bug! */
 570                 case -NFS4ERR_BADNAME:
 571                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 572                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 573                                 exception->retry = 1;
 574                                 printk(KERN_WARNING "NFS: v4 server %s "
 575                                                 "does not accept raw "
 576                                                 "uid/gids. "
 577                                                 "Reenabling the idmapper.\n",
 578                                                 server->nfs_client->cl_hostname);
 579                         }
 580         }
 581         /* We failed to handle the error */
 582         return nfs4_map_errors(ret);
 583 wait_on_recovery:
 584         exception->recovering = 1;
 585         return 0;
 586 }
 587
 588 /* This is the error handling routine for processes that are allowed
 589  * to sleep.
 590  */
 591 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 592 {
 593         struct nfs_client *clp = server->nfs_client;
 594         int ret;
 595
 596         ret = nfs4_do_handle_exception(server, errorcode, exception);
 597         if (exception->delay) {
 598                 ret = nfs4_delay(&exception->timeout,
 599                                 exception->interruptible);
 600                 goto out_retry;
 601         }
 602         if (exception->recovering) {
 603                 if (exception->task_is_privileged)
 604                         return -EDEADLOCK;
 605                 ret = nfs4_wait_clnt_recover(clp);
 606                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 607                         return -EIO;
 608                 goto out_retry;
 609         }
 610         return ret;
 611 out_retry:
 612         if (ret == 0)
 613                 exception->retry = 1;
 614         return ret;
 615 }
 616
 617 static int
 618 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 619                 int errorcode, struct nfs4_exception *exception)
 620 {
 621         struct nfs_client *clp = server->nfs_client;
 622         int ret;
 623
 624         ret = nfs4_do_handle_exception(server, errorcode, exception);
 625         if (exception->delay) {
 626                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 627                 goto out_retry;
 628         }
 629         if (exception->recovering) {
 630                 if (exception->task_is_privileged)
 631                         return -EDEADLOCK;
 632                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 633                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 634                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 635                 goto out_retry;
 636         }
 637         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 638                 ret = -EIO;
 639         return ret;
 640 out_retry:
 641         if (ret == 0) {
 642                 exception->retry = 1;
 643                 /*
 644                  * For NFS4ERR_MOVED, the client transport will need to
 645                  * be recomputed after migration recovery has completed.
 646                  */
 647                 if (errorcode == -NFS4ERR_MOVED)
 648                         rpc_task_release_transport(task);
 649         }
 650         return ret;
 651 }
 652
 653 int
 654 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 655                         struct nfs4_state *state, long *timeout)
 656 {
 657         struct nfs4_exception exception = {
 658                 .state = state,
 659         };
 660
 661         if (task->tk_status >= 0)
 662                 return 0;
 663         if (timeout)
 664                 exception.timeout = *timeout;
 665         task->tk_status = nfs4_async_handle_exception(task, server,
 666                         task->tk_status,
 667                         &exception);
 668         if (exception.delay && timeout)
 669                 *timeout = exception.timeout;
 670         if (exception.retry)
 671                 return -EAGAIN;
 672         return 0;
 673 }
 674
 675 /*
 676  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 677  * or 'false' otherwise.
 678  */
 679 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 680 {
 681         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 682         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 683 }
 684
 685 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 686 {
 687         spin_lock(&clp->cl_lock);
 688         if (time_before(clp->cl_last_renewal,timestamp))
 689                 clp->cl_last_renewal = timestamp;
 690         spin_unlock(&clp->cl_lock);
 691 }
 692
 693 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 694 {
 695         struct nfs_client *clp = server->nfs_client;
 696
 697         if (!nfs4_has_session(clp))
 698                 do_renew_lease(clp, timestamp);
 699 }
 700
 701 struct nfs4_call_sync_data {
 702         const struct nfs_server *seq_server;
 703         struct nfs4_sequence_args *seq_args;
 704         struct nfs4_sequence_res *seq_res;
 705 };
 706
 707 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 708                         struct nfs4_sequence_res *res, int cache_reply,
 709                         int privileged)
 710 {
 711         args->sa_slot = NULL;
 712         args->sa_cache_this = cache_reply;
 713         args->sa_privileged = privileged;
 714
 715         res->sr_slot = NULL;
 716 }
 717
 718 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 719 {
 720         struct nfs4_slot *slot = res->sr_slot;
 721         struct nfs4_slot_table *tbl;
 722
 723         tbl = slot->table;
 724         spin_lock(&tbl->slot_tbl_lock);
 725         if (!nfs41_wake_and_assign_slot(tbl, slot))
 726                 nfs4_free_slot(tbl, slot);
 727         spin_unlock(&tbl->slot_tbl_lock);
 728
 729         res->sr_slot = NULL;
 730 }
 731
 732 static int nfs40_sequence_done(struct rpc_task *task,
 733                                struct nfs4_sequence_res *res)
 734 {
 735         if (res->sr_slot != NULL)
 736                 nfs40_sequence_free_slot(res);
 737         return 1;
 738 }
 739
 740 #if defined(CONFIG_NFS_V4_1)
 741
 742 static void nfs41_release_slot(struct nfs4_slot *slot)
 743 {
 744         struct nfs4_session *session;
 745         struct nfs4_slot_table *tbl;
 746         bool send_new_highest_used_slotid = false;
 747
 748         if (!slot)
 749                 return;
 750         tbl = slot->table;
 751         session = tbl->session;
 752
 753         /* Bump the slot sequence number */
 754         if (slot->seq_done)
 755                 slot->seq_nr++;
 756         slot->seq_done = 0;
 757
 758         spin_lock(&tbl->slot_tbl_lock);
 759         /* Be nice to the server: try to ensure that the last transmitted
 760          * value for highest_user_slotid <= target_highest_slotid
 761          */
 762         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 763                 send_new_highest_used_slotid = true;
 764
 765         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 766                 send_new_highest_used_slotid = false;
 767                 goto out_unlock;
 768         }
 769         nfs4_free_slot(tbl, slot);
 770
 771         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 772                 send_new_highest_used_slotid = false;
 773 out_unlock:
 774         spin_unlock(&tbl->slot_tbl_lock);
 775         if (send_new_highest_used_slotid)
 776                 nfs41_notify_server(session->clp);
 777         if (waitqueue_active(&tbl->slot_waitq))
 778                 wake_up_all(&tbl->slot_waitq);
 779 }
 780
 781 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 782 {
 783         nfs41_release_slot(res->sr_slot);
 784         res->sr_slot = NULL;
 785 }
 786
 787 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 788                 u32 seqnr)
 789 {
 790         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 791                 slot->seq_nr_highest_sent = seqnr;
 792 }
 793 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 794 {
 795         nfs4_slot_sequence_record_sent(slot, seqnr);
 796         slot->seq_nr_last_acked = seqnr;
 797 }
 798
 799 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 800                                 struct nfs4_slot *slot)
 801 {
 802         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 803         if (!IS_ERR(task))
 804                 rpc_put_task_async(task);
 805 }
 806
 807 static int nfs41_sequence_process(struct rpc_task *task,
 808                 struct nfs4_sequence_res *res)
 809 {
 810         struct nfs4_session *session;
 811         struct nfs4_slot *slot = res->sr_slot;
 812         struct nfs_client *clp;
 813         int status;
 814         int ret = 1;
 815
 816         if (slot == NULL)
 817                 goto out_noaction;
 818         /* don't increment the sequence number if the task wasn't sent */
 819         if (!RPC_WAS_SENT(task) || slot->seq_done)
 820                 goto out;
 821
 822         session = slot->table->session;
 823         clp = session->clp;
 824
 825         trace_nfs4_sequence_done(session, res);
 826
 827         status = res->sr_status;
 828         if (task->tk_status == -NFS4ERR_DEADSESSION)
 829                 status = -NFS4ERR_DEADSESSION;
 830
 831         /* Check the SEQUENCE operation status */
 832         switch (status) {
 833         case 0:
 834                 /* Mark this sequence number as having been acked */
 835                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 836                 /* Update the slot's sequence and clientid lease timer */
 837                 slot->seq_done = 1;
 838                 do_renew_lease(clp, res->sr_timestamp);
 839                 /* Check sequence flags */
 840                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 841                                 !!slot->privileged);
 842                 nfs41_update_target_slotid(slot->table, slot, res);
 843                 break;
 844         case 1:
 845                 /*
 846                  * sr_status remains 1 if an RPC level error occurred.
 847                  * The server may or may not have processed the sequence
 848                  * operation..
 849                  */
 850                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 851                 slot->seq_done = 1;
 852                 goto out;
 853         case -NFS4ERR_DELAY:
 854                 /* The server detected a resend of the RPC call and
 855                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 856                  * of RFC5661.
 857                  */
 858                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 859                         __func__,
 860                         slot->slot_nr,
 861                         slot->seq_nr);
 862                 goto out_retry;
 863         case -NFS4ERR_RETRY_UNCACHED_REP:
 864         case -NFS4ERR_SEQ_FALSE_RETRY:
 865                 /*
 866                  * The server thinks we tried to replay a request.
 867                  * Retry the call after bumping the sequence ID.
 868                  */
 869                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 870                 goto retry_new_seq;
 871         case -NFS4ERR_BADSLOT:
 872                 /*
 873                  * The slot id we used was probably retired. Try again
 874                  * using a different slot id.
 875                  */
 876                 if (slot->slot_nr < slot->table->target_highest_slotid)
 877                         goto session_recover;
 878                 goto retry_nowait;
 879         case -NFS4ERR_SEQ_MISORDERED:
 880                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 881                 /*
 882                  * Were one or more calls using this slot interrupted?
 883                  * If the server never received the request, then our
 884                  * transmitted slot sequence number may be too high. However,
 885                  * if the server did receive the request then it might
 886                  * accidentally give us a reply with a mismatched operation.
 887                  * We can sort this out by sending a lone sequence operation
 888                  * to the server on the same slot.
 889                  */
 890                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 891                         slot->seq_nr--;
 892                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 893                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 894                                 res->sr_slot = NULL;
 895                         }
 896                         goto retry_nowait;
 897                 }
 898                 /*
 899                  * RFC5661:
 900                  * A retry might be sent while the original request is
 901                  * still in progress on the replier. The replier SHOULD
 902                  * deal with the issue by returning NFS4ERR_DELAY as the
 903                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 904                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 905                  *
 906                  * Restart the search after a delay.
 907                  */
 908                 slot->seq_nr = slot->seq_nr_highest_sent;
 909                 goto out_retry;
 910         case -NFS4ERR_BADSESSION:
 911         case -NFS4ERR_DEADSESSION:
 912         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 913                 goto session_recover;
 914         default:
 915                 /* Just update the slot sequence no. */
 916                 slot->seq_done = 1;
 917         }
 918 out:
 919         /* The session may be reset by one of the error handlers. */
 920         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 921 out_noaction:
 922         return ret;
 923 session_recover:
 924         set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
 925         nfs4_schedule_session_recovery(session, status);
 926         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 927         nfs41_sequence_free_slot(res);
 928         goto out;
 929 retry_new_seq:
 930         ++slot->seq_nr;
 931 retry_nowait:
 932         if (rpc_restart_call_prepare(task)) {
 933                 nfs41_sequence_free_slot(res);
 934                 task->tk_status = 0;
 935                 ret = 0;
 936         }
 937         goto out;
 938 out_retry:
 939         if (!rpc_restart_call(task))
 940                 goto out;
 941         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 942         return 0;
 943 }
 944
 945 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 946 {
 947         if (!nfs41_sequence_process(task, res))
 948                 return 0;
 949         if (res->sr_slot != NULL)
 950                 nfs41_sequence_free_slot(res);
 951         return 1;
 952
 953 }
 954 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 955
 956 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 957 {
 958         if (res->sr_slot == NULL)
 959                 return 1;
 960         if (res->sr_slot->table->session != NULL)
 961                 return nfs41_sequence_process(task, res);
 962         return nfs40_sequence_done(task, res);
 963 }
 964
 965 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 966 {
 967         if (res->sr_slot != NULL) {
 968                 if (res->sr_slot->table->session != NULL)
 969                         nfs41_sequence_free_slot(res);
 970                 else
 971                         nfs40_sequence_free_slot(res);
 972         }
 973 }
 974
 975 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 976 {
 977         if (res->sr_slot == NULL)
 978                 return 1;
 979         if (!res->sr_slot->table->session)
 980                 return nfs40_sequence_done(task, res);
 981         return nfs41_sequence_done(task, res);
 982 }
 983 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 984
 985 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 986 {
 987         struct nfs4_call_sync_data *data = calldata;
 988
 989         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 990
 991         nfs4_setup_sequence(data->seq_server->nfs_client,
 992                             data->seq_args, data->seq_res, task);
 993 }
 994
 995 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 996 {
 997         struct nfs4_call_sync_data *data = calldata;
 998
 999         nfs41_sequence_done(task, data->seq_res);
1000 }
1001
1002 static const struct rpc_call_ops nfs41_call_sync_ops = {
1003         .rpc_call_prepare = nfs41_call_sync_prepare,
1004         .rpc_call_done = nfs41_call_sync_done,
1005 };
1006
1007 #else   /* !CONFIG_NFS_V4_1 */
1008
1009 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1010 {
1011         return nfs40_sequence_done(task, res);
1012 }
1013
1014 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1015 {
1016         if (res->sr_slot != NULL)
1017                 nfs40_sequence_free_slot(res);
1018 }
1019
1020 int nfs4_sequence_done(struct rpc_task *task,
1021                        struct nfs4_sequence_res *res)
1022 {
1023         return nfs40_sequence_done(task, res);
1024 }
1025 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1026
1027 #endif  /* !CONFIG_NFS_V4_1 */
1028
1029 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1030 {
1031         res->sr_timestamp = jiffies;
1032         res->sr_status_flags = 0;
1033         res->sr_status = 1;
1034 }
1035
1036 static
1037 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1038                 struct nfs4_sequence_res *res,
1039                 struct nfs4_slot *slot)
1040 {
1041         if (!slot)
1042                 return;
1043         slot->privileged = args->sa_privileged ? 1 : 0;
1044         args->sa_slot = slot;
1045
1046         res->sr_slot = slot;
1047 }
1048
1049 int nfs4_setup_sequence(struct nfs_client *client,
1050                         struct nfs4_sequence_args *args,
1051                         struct nfs4_sequence_res *res,
1052                         struct rpc_task *task)
1053 {
1054         struct nfs4_session *session = nfs4_get_session(client);
1055         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1056         struct nfs4_slot *slot;
1057
1058         /* slot already allocated? */
1059         if (res->sr_slot != NULL)
1060                 goto out_start;
1061
1062         if (session)
1063                 tbl = &session->fc_slot_table;
1064
1065         spin_lock(&tbl->slot_tbl_lock);
1066         /* The state manager will wait until the slot table is empty */
1067         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1068                 goto out_sleep;
1069
1070         slot = nfs4_alloc_slot(tbl);
1071         if (IS_ERR(slot)) {
1072                 if (slot == ERR_PTR(-ENOMEM))
1073                         goto out_sleep_timeout;
1074                 goto out_sleep;
1075         }
1076         spin_unlock(&tbl->slot_tbl_lock);
1077
1078         nfs4_sequence_attach_slot(args, res, slot);
1079
1080         trace_nfs4_setup_sequence(session, args);
1081 out_start:
1082         nfs41_sequence_res_init(res);
1083         rpc_call_start(task);
1084         return 0;
1085 out_sleep_timeout:
1086         /* Try again in 1/4 second */
1087         if (args->sa_privileged)
1088                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1089                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1090         else
1091                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1092                                 NULL, jiffies + (HZ >> 2));
1093         spin_unlock(&tbl->slot_tbl_lock);
1094         return -EAGAIN;
1095 out_sleep:
1096         if (args->sa_privileged)
1097                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1098                                 RPC_PRIORITY_PRIVILEGED);
1099         else
1100                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1101         spin_unlock(&tbl->slot_tbl_lock);
1102         return -EAGAIN;
1103 }
1104 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1105
1106 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1107 {
1108         struct nfs4_call_sync_data *data = calldata;
1109         nfs4_setup_sequence(data->seq_server->nfs_client,
1110                                 data->seq_args, data->seq_res, task);
1111 }
1112
1113 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1114 {
1115         struct nfs4_call_sync_data *data = calldata;
1116         nfs4_sequence_done(task, data->seq_res);
1117 }
1118
1119 static const struct rpc_call_ops nfs40_call_sync_ops = {
1120         .rpc_call_prepare = nfs40_call_sync_prepare,
1121         .rpc_call_done = nfs40_call_sync_done,
1122 };
1123
1124 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1125 {
1126         int ret;
1127         struct rpc_task *task;
1128
1129         task = rpc_run_task(task_setup);
1130         if (IS_ERR(task))
1131                 return PTR_ERR(task);
1132
1133         ret = task->tk_status;
1134         rpc_put_task(task);
1135         return ret;
1136 }
1137
1138 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1139                              struct nfs_server *server,
1140                              struct rpc_message *msg,
1141                              struct nfs4_sequence_args *args,
1142                              struct nfs4_sequence_res *res,
1143                              unsigned short task_flags)
1144 {
1145         struct nfs_client *clp = server->nfs_client;
1146         struct nfs4_call_sync_data data = {
1147                 .seq_server = server,
1148                 .seq_args = args,
1149                 .seq_res = res,
1150         };
1151         struct rpc_task_setup task_setup = {
1152                 .rpc_client = clnt,
1153                 .rpc_message = msg,
1154                 .callback_ops = clp->cl_mvops->call_sync_ops,
1155                 .callback_data = &data,
1156                 .flags = task_flags,
1157         };
1158
1159         return nfs4_call_sync_custom(&task_setup);
1160 }
1161
1162 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1163                                    struct nfs_server *server,
1164                                    struct rpc_message *msg,
1165                                    struct nfs4_sequence_args *args,
1166                                    struct nfs4_sequence_res *res)
1167 {
1168         unsigned short task_flags = 0;
1169
1170         if (server->caps & NFS_CAP_MOVEABLE)
1171                 task_flags = RPC_TASK_MOVEABLE;
1172         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1173 }
1174
1175
1176 int nfs4_call_sync(struct rpc_clnt *clnt,
1177                    struct nfs_server *server,
1178                    struct rpc_message *msg,
1179                    struct nfs4_sequence_args *args,
1180                    struct nfs4_sequence_res *res,
1181                    int cache_reply)
1182 {
1183         nfs4_init_sequence(args, res, cache_reply, 0);
1184         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1185 }
1186
1187 static void
1188 nfs4_inc_nlink_locked(struct inode *inode)
1189 {
1190         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1191                                              NFS_INO_INVALID_CTIME |
1192                                              NFS_INO_INVALID_NLINK);
1193         inc_nlink(inode);
1194 }
1195
1196 static void
1197 nfs4_inc_nlink(struct inode *inode)
1198 {
1199         spin_lock(&inode->i_lock);
1200         nfs4_inc_nlink_locked(inode);
1201         spin_unlock(&inode->i_lock);
1202 }
1203
1204 static void
1205 nfs4_dec_nlink_locked(struct inode *inode)
1206 {
1207         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1208                                              NFS_INO_INVALID_CTIME |
1209                                              NFS_INO_INVALID_NLINK);
1210         drop_nlink(inode);
1211 }
1212
1213 static void
1214 nfs4_update_changeattr_locked(struct inode *inode,
1215                 struct nfs4_change_info *cinfo,
1216                 unsigned long timestamp, unsigned long cache_validity)
1217 {
1218         struct nfs_inode *nfsi = NFS_I(inode);
1219         u64 change_attr = inode_peek_iversion_raw(inode);
1220
1221         cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1222         if (S_ISDIR(inode->i_mode))
1223                 cache_validity |= NFS_INO_INVALID_DATA;
1224
1225         switch (NFS_SERVER(inode)->change_attr_type) {
1226         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1227                 if (cinfo->after == change_attr)
1228                         goto out;
1229                 break;
1230         default:
1231                 if ((s64)(change_attr - cinfo->after) >= 0)
1232                         goto out;
1233         }
1234
1235         inode_set_iversion_raw(inode, cinfo->after);
1236         if (!cinfo->atomic || cinfo->before != change_attr) {
1237                 if (S_ISDIR(inode->i_mode))
1238                         nfs_force_lookup_revalidate(inode);
1239
1240                 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1241                         cache_validity |=
1242                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1243                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1244                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1245                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1246                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1247         }
1248         nfsi->attrtimeo_timestamp = jiffies;
1249         nfsi->read_cache_jiffies = timestamp;
1250         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1251         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1252 out:
1253         nfs_set_cache_invalid(inode, cache_validity);
1254 }
1255
1256 void
1257 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1258                 unsigned long timestamp, unsigned long cache_validity)
1259 {
1260         spin_lock(&dir->i_lock);
1261         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1262         spin_unlock(&dir->i_lock);
1263 }
1264
1265 struct nfs4_open_createattrs {
1266         struct nfs4_label *label;
1267         struct iattr *sattr;
1268         const __u32 verf[2];
1269 };
1270
1271 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1272                 int err, struct nfs4_exception *exception)
1273 {
1274         if (err != -EINVAL)
1275                 return false;
1276         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1277                 return false;
1278         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1279         exception->retry = 1;
1280         return true;
1281 }
1282
1283 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1284 {
1285          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1286 }
1287
1288 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1289 {
1290         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1291
1292         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1293 }
1294
1295 static u32
1296 nfs4_map_atomic_open_share(struct nfs_server *server,
1297                 fmode_t fmode, int openflags)
1298 {
1299         u32 res = 0;
1300
1301         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1302         case FMODE_READ:
1303                 res = NFS4_SHARE_ACCESS_READ;
1304                 break;
1305         case FMODE_WRITE:
1306                 res = NFS4_SHARE_ACCESS_WRITE;
1307                 break;
1308         case FMODE_READ|FMODE_WRITE:
1309                 res = NFS4_SHARE_ACCESS_BOTH;
1310         }
1311         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1312                 goto out;
1313         /* Want no delegation if we're using O_DIRECT */
1314         if (openflags & O_DIRECT)
1315                 res |= NFS4_SHARE_WANT_NO_DELEG;
1316 out:
1317         return res;
1318 }
1319
1320 static enum open_claim_type4
1321 nfs4_map_atomic_open_claim(struct nfs_server *server,
1322                 enum open_claim_type4 claim)
1323 {
1324         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1325                 return claim;
1326         switch (claim) {
1327         default:
1328                 return claim;
1329         case NFS4_OPEN_CLAIM_FH:
1330                 return NFS4_OPEN_CLAIM_NULL;
1331         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1332                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1333         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1334                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1335         }
1336 }
1337
1338 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1339 {
1340         p->o_res.f_attr = &p->f_attr;
1341         p->o_res.seqid = p->o_arg.seqid;
1342         p->c_res.seqid = p->c_arg.seqid;
1343         p->o_res.server = p->o_arg.server;
1344         p->o_res.access_request = p->o_arg.access;
1345         nfs_fattr_init(&p->f_attr);
1346         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1347 }
1348
1349 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1350                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1351                 const struct nfs4_open_createattrs *c,
1352                 enum open_claim_type4 claim,
1353                 gfp_t gfp_mask)
1354 {
1355         struct dentry *parent = dget_parent(dentry);
1356         struct inode *dir = d_inode(parent);
1357         struct nfs_server *server = NFS_SERVER(dir);
1358         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1359         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1360         struct nfs4_opendata *p;
1361
1362         p = kzalloc(sizeof(*p), gfp_mask);
1363         if (p == NULL)
1364                 goto err;
1365
1366         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1367         if (IS_ERR(p->f_attr.label))
1368                 goto err_free_p;
1369
1370         p->a_label = nfs4_label_alloc(server, gfp_mask);
1371         if (IS_ERR(p->a_label))
1372                 goto err_free_f;
1373
1374         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1375         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1376         if (IS_ERR(p->o_arg.seqid))
1377                 goto err_free_label;
1378         nfs_sb_active(dentry->d_sb);
1379         p->dentry = dget(dentry);
1380         p->dir = parent;
1381         p->owner = sp;
1382         atomic_inc(&sp->so_count);
1383         p->o_arg.open_flags = flags;
1384         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1385         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1386         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1387                         fmode, flags);
1388         if (flags & O_CREAT) {
1389                 p->o_arg.umask = current_umask();
1390                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1391                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1392                         p->o_arg.u.attrs = &p->attrs;
1393                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1394
1395                         memcpy(p->o_arg.u.verifier.data, c->verf,
1396                                         sizeof(p->o_arg.u.verifier.data));
1397                 }
1398         }
1399         /* ask server to check for all possible rights as results
1400          * are cached */
1401         switch (p->o_arg.claim) {
1402         default:
1403                 break;
1404         case NFS4_OPEN_CLAIM_NULL:
1405         case NFS4_OPEN_CLAIM_FH:
1406                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1407                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1408                                   NFS4_ACCESS_EXECUTE |
1409                                   nfs_access_xattr_mask(server);
1410         }
1411         p->o_arg.clientid = server->nfs_client->cl_clientid;
1412         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1413         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1414         p->o_arg.name = &dentry->d_name;
1415         p->o_arg.server = server;
1416         p->o_arg.bitmask = nfs4_bitmask(server, label);
1417         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1418         switch (p->o_arg.claim) {
1419         case NFS4_OPEN_CLAIM_NULL:
1420         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1421         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1422                 p->o_arg.fh = NFS_FH(dir);
1423                 break;
1424         case NFS4_OPEN_CLAIM_PREVIOUS:
1425         case NFS4_OPEN_CLAIM_FH:
1426         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1427         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1428                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1429         }
1430         p->c_arg.fh = &p->o_res.fh;
1431         p->c_arg.stateid = &p->o_res.stateid;
1432         p->c_arg.seqid = p->o_arg.seqid;
1433         nfs4_init_opendata_res(p);
1434         kref_init(&p->kref);
1435         return p;
1436
1437 err_free_label:
1438         nfs4_label_free(p->a_label);
1439 err_free_f:
1440         nfs4_label_free(p->f_attr.label);
1441 err_free_p:
1442         kfree(p);
1443 err:
1444         dput(parent);
1445         return NULL;
1446 }
1447
1448 static void nfs4_opendata_free(struct kref *kref)
1449 {
1450         struct nfs4_opendata *p = container_of(kref,
1451                         struct nfs4_opendata, kref);
1452         struct super_block *sb = p->dentry->d_sb;
1453
1454         nfs4_lgopen_release(p->lgp);
1455         nfs_free_seqid(p->o_arg.seqid);
1456         nfs4_sequence_free_slot(&p->o_res.seq_res);
1457         if (p->state != NULL)
1458                 nfs4_put_open_state(p->state);
1459         nfs4_put_state_owner(p->owner);
1460
1461         nfs4_label_free(p->a_label);
1462         nfs4_label_free(p->f_attr.label);
1463
1464         dput(p->dir);
1465         dput(p->dentry);
1466         nfs_sb_deactive(sb);
1467         nfs_fattr_free_names(&p->f_attr);
1468         kfree(p->f_attr.mdsthreshold);
1469         kfree(p);
1470 }
1471
1472 static void nfs4_opendata_put(struct nfs4_opendata *p)
1473 {
1474         if (p != NULL)
1475                 kref_put(&p->kref, nfs4_opendata_free);
1476 }
1477
1478 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1479                 fmode_t fmode)
1480 {
1481         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1482         case FMODE_READ|FMODE_WRITE:
1483                 return state->n_rdwr != 0;
1484         case FMODE_WRITE:
1485                 return state->n_wronly != 0;
1486         case FMODE_READ:
1487                 return state->n_rdonly != 0;
1488         }
1489         WARN_ON_ONCE(1);
1490         return false;
1491 }
1492
1493 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1494                 int open_mode, enum open_claim_type4 claim)
1495 {
1496         int ret = 0;
1497
1498         if (open_mode & (O_EXCL|O_TRUNC))
1499                 goto out;
1500         switch (claim) {
1501         case NFS4_OPEN_CLAIM_NULL:
1502         case NFS4_OPEN_CLAIM_FH:
1503                 goto out;
1504         default:
1505                 break;
1506         }
1507         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1508                 case FMODE_READ:
1509                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1510                                 && state->n_rdonly != 0;
1511                         break;
1512                 case FMODE_WRITE:
1513                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1514                                 && state->n_wronly != 0;
1515                         break;
1516                 case FMODE_READ|FMODE_WRITE:
1517                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1518                                 && state->n_rdwr != 0;
1519         }
1520 out:
1521         return ret;
1522 }
1523
1524 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1525                 enum open_claim_type4 claim)
1526 {
1527         if (delegation == NULL)
1528                 return 0;
1529         if ((delegation->type & fmode) != fmode)
1530                 return 0;
1531         switch (claim) {
1532         case NFS4_OPEN_CLAIM_NULL:
1533         case NFS4_OPEN_CLAIM_FH:
1534                 break;
1535         case NFS4_OPEN_CLAIM_PREVIOUS:
1536                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1537                         break;
1538                 fallthrough;
1539         default:
1540                 return 0;
1541         }
1542         nfs_mark_delegation_referenced(delegation);
1543         return 1;
1544 }
1545
1546 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1547 {
1548         switch (fmode) {
1549                 case FMODE_WRITE:
1550                         state->n_wronly++;
1551                         break;
1552                 case FMODE_READ:
1553                         state->n_rdonly++;
1554                         break;
1555                 case FMODE_READ|FMODE_WRITE:
1556                         state->n_rdwr++;
1557         }
1558         nfs4_state_set_mode_locked(state, state->state | fmode);
1559 }
1560
1561 #ifdef CONFIG_NFS_V4_1
1562 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1563 {
1564         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1565                 return true;
1566         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1567                 return true;
1568         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1569                 return true;
1570         return false;
1571 }
1572 #endif /* CONFIG_NFS_V4_1 */
1573
1574 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1575 {
1576         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1577                 wake_up_all(&state->waitq);
1578 }
1579
1580 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1581 {
1582         struct nfs_client *clp = state->owner->so_server->nfs_client;
1583         bool need_recover = false;
1584
1585         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1586                 need_recover = true;
1587         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1588                 need_recover = true;
1589         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1590                 need_recover = true;
1591         if (need_recover)
1592                 nfs4_state_mark_reclaim_nograce(clp, state);
1593 }
1594
1595 /*
1596  * Check for whether or not the caller may update the open stateid
1597  * to the value passed in by stateid.
1598  *
1599  * Note: This function relies heavily on the server implementing
1600  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1601  * correctly.
1602  * i.e. The stateid seqids have to be initialised to 1, and
1603  * are then incremented on every state transition.
1604  */
1605 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1606                 const nfs4_stateid *stateid)
1607 {
1608         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1609                 /* The common case - we're updating to a new sequence number */
1610                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1611                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1612                                 return true;
1613                         return false;
1614                 }
1615                 /* The server returned a new stateid */
1616         }
1617         /* This is the first OPEN in this generation */
1618         if (stateid->seqid == cpu_to_be32(1))
1619                 return true;
1620         return false;
1621 }
1622
1623 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1624 {
1625         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1626                 return;
1627         if (state->n_wronly)
1628                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1629         if (state->n_rdonly)
1630                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1631         if (state->n_rdwr)
1632                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1633         set_bit(NFS_OPEN_STATE, &state->flags);
1634 }
1635
1636 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1637                 nfs4_stateid *stateid, fmode_t fmode)
1638 {
1639         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1640         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1641         case FMODE_WRITE:
1642                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1643                 break;
1644         case FMODE_READ:
1645                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1646                 break;
1647         case 0:
1648                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1649                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1650                 clear_bit(NFS_OPEN_STATE, &state->flags);
1651         }
1652         if (stateid == NULL)
1653                 return;
1654         /* Handle OPEN+OPEN_DOWNGRADE races */
1655         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1656             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1657                 nfs_resync_open_stateid_locked(state);
1658                 goto out;
1659         }
1660         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1661                 nfs4_stateid_copy(&state->stateid, stateid);
1662         nfs4_stateid_copy(&state->open_stateid, stateid);
1663         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1664 out:
1665         nfs_state_log_update_open_stateid(state);
1666 }
1667
1668 static void nfs_clear_open_stateid(struct nfs4_state *state,
1669         nfs4_stateid *arg_stateid,
1670         nfs4_stateid *stateid, fmode_t fmode)
1671 {
1672         write_seqlock(&state->seqlock);
1673         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1674         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1675                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1676         write_sequnlock(&state->seqlock);
1677         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1678                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1679 }
1680
1681 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1682                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1683         __must_hold(&state->owner->so_lock)
1684         __must_hold(&state->seqlock)
1685         __must_hold(RCU)
1686
1687 {
1688         DEFINE_WAIT(wait);
1689         int status = 0;
1690         for (;;) {
1691
1692                 if (nfs_stateid_is_sequential(state, stateid))
1693                         break;
1694
1695                 if (status)
1696                         break;
1697                 /* Rely on seqids for serialisation with NFSv4.0 */
1698                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1699                         break;
1700
1701                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1702                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1703                 /*
1704                  * Ensure we process the state changes in the same order
1705                  * in which the server processed them by delaying the
1706                  * update of the stateid until we are in sequence.
1707                  */
1708                 write_sequnlock(&state->seqlock);
1709                 spin_unlock(&state->owner->so_lock);
1710                 rcu_read_unlock();
1711                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1712
1713                 if (!fatal_signal_pending(current)) {
1714                         if (schedule_timeout(5*HZ) == 0)
1715                                 status = -EAGAIN;
1716                         else
1717                                 status = 0;
1718                 } else
1719                         status = -EINTR;
1720                 finish_wait(&state->waitq, &wait);
1721                 rcu_read_lock();
1722                 spin_lock(&state->owner->so_lock);
1723                 write_seqlock(&state->seqlock);
1724         }
1725
1726         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1727             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1728                 nfs4_stateid_copy(freeme, &state->open_stateid);
1729                 nfs_test_and_clear_all_open_stateid(state);
1730         }
1731
1732         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1733                 nfs4_stateid_copy(&state->stateid, stateid);
1734         nfs4_stateid_copy(&state->open_stateid, stateid);
1735         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1736         nfs_state_log_update_open_stateid(state);
1737 }
1738
1739 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1740                 const nfs4_stateid *open_stateid,
1741                 fmode_t fmode,
1742                 nfs4_stateid *freeme)
1743 {
1744         /*
1745          * Protect the call to nfs4_state_set_mode_locked and
1746          * serialise the stateid update
1747          */
1748         write_seqlock(&state->seqlock);
1749         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1750         switch (fmode) {
1751         case FMODE_READ:
1752                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1753                 break;
1754         case FMODE_WRITE:
1755                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1756                 break;
1757         case FMODE_READ|FMODE_WRITE:
1758                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1759         }
1760         set_bit(NFS_OPEN_STATE, &state->flags);
1761         write_sequnlock(&state->seqlock);
1762 }
1763
1764 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1765 {
1766         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1767         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1768         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1769         clear_bit(NFS_OPEN_STATE, &state->flags);
1770 }
1771
1772 static void nfs_state_set_delegation(struct nfs4_state *state,
1773                 const nfs4_stateid *deleg_stateid,
1774                 fmode_t fmode)
1775 {
1776         /*
1777          * Protect the call to nfs4_state_set_mode_locked and
1778          * serialise the stateid update
1779          */
1780         write_seqlock(&state->seqlock);
1781         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1782         set_bit(NFS_DELEGATED_STATE, &state->flags);
1783         write_sequnlock(&state->seqlock);
1784 }
1785
1786 static void nfs_state_clear_delegation(struct nfs4_state *state)
1787 {
1788         write_seqlock(&state->seqlock);
1789         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1790         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1791         write_sequnlock(&state->seqlock);
1792 }
1793
1794 int update_open_stateid(struct nfs4_state *state,
1795                 const nfs4_stateid *open_stateid,
1796                 const nfs4_stateid *delegation,
1797                 fmode_t fmode)
1798 {
1799         struct nfs_server *server = NFS_SERVER(state->inode);
1800         struct nfs_client *clp = server->nfs_client;
1801         struct nfs_inode *nfsi = NFS_I(state->inode);
1802         struct nfs_delegation *deleg_cur;
1803         nfs4_stateid freeme = { };
1804         int ret = 0;
1805
1806         fmode &= (FMODE_READ|FMODE_WRITE);
1807
1808         rcu_read_lock();
1809         spin_lock(&state->owner->so_lock);
1810         if (open_stateid != NULL) {
1811                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1812                 ret = 1;
1813         }
1814
1815         deleg_cur = nfs4_get_valid_delegation(state->inode);
1816         if (deleg_cur == NULL)
1817                 goto no_delegation;
1818
1819         spin_lock(&deleg_cur->lock);
1820         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1821            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1822             (deleg_cur->type & fmode) != fmode)
1823                 goto no_delegation_unlock;
1824
1825         if (delegation == NULL)
1826                 delegation = &deleg_cur->stateid;
1827         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1828                 goto no_delegation_unlock;
1829
1830         nfs_mark_delegation_referenced(deleg_cur);
1831         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1832         ret = 1;
1833 no_delegation_unlock:
1834         spin_unlock(&deleg_cur->lock);
1835 no_delegation:
1836         if (ret)
1837                 update_open_stateflags(state, fmode);
1838         spin_unlock(&state->owner->so_lock);
1839         rcu_read_unlock();
1840
1841         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1842                 nfs4_schedule_state_manager(clp);
1843         if (freeme.type != 0)
1844                 nfs4_test_and_free_stateid(server, &freeme,
1845                                 state->owner->so_cred);
1846
1847         return ret;
1848 }
1849
1850 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1851                 const nfs4_stateid *stateid)
1852 {
1853         struct nfs4_state *state = lsp->ls_state;
1854         bool ret = false;
1855
1856         spin_lock(&state->state_lock);
1857         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1858                 goto out_noupdate;
1859         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1860                 goto out_noupdate;
1861         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1862         ret = true;
1863 out_noupdate:
1864         spin_unlock(&state->state_lock);
1865         return ret;
1866 }
1867
1868 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1869 {
1870         struct nfs_delegation *delegation;
1871
1872         fmode &= FMODE_READ|FMODE_WRITE;
1873         rcu_read_lock();
1874         delegation = nfs4_get_valid_delegation(inode);
1875         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1876                 rcu_read_unlock();
1877                 return;
1878         }
1879         rcu_read_unlock();
1880         nfs4_inode_return_delegation(inode);
1881 }
1882
1883 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1884 {
1885         struct nfs4_state *state = opendata->state;
1886         struct nfs_delegation *delegation;
1887         int open_mode = opendata->o_arg.open_flags;
1888         fmode_t fmode = opendata->o_arg.fmode;
1889         enum open_claim_type4 claim = opendata->o_arg.claim;
1890         nfs4_stateid stateid;
1891         int ret = -EAGAIN;
1892
1893         for (;;) {
1894                 spin_lock(&state->owner->so_lock);
1895                 if (can_open_cached(state, fmode, open_mode, claim)) {
1896                         update_open_stateflags(state, fmode);
1897                         spin_unlock(&state->owner->so_lock);
1898                         goto out_return_state;
1899                 }
1900                 spin_unlock(&state->owner->so_lock);
1901                 rcu_read_lock();
1902                 delegation = nfs4_get_valid_delegation(state->inode);
1903                 if (!can_open_delegated(delegation, fmode, claim)) {
1904                         rcu_read_unlock();
1905                         break;
1906                 }
1907                 /* Save the delegation */
1908                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1909                 rcu_read_unlock();
1910                 nfs_release_seqid(opendata->o_arg.seqid);
1911                 if (!opendata->is_recover) {
1912                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1913                         if (ret != 0)
1914                                 goto out;
1915                 }
1916                 ret = -EAGAIN;
1917
1918                 /* Try to update the stateid using the delegation */
1919                 if (update_open_stateid(state, NULL, &stateid, fmode))
1920                         goto out_return_state;
1921         }
1922 out:
1923         return ERR_PTR(ret);
1924 out_return_state:
1925         refcount_inc(&state->count);
1926         return state;
1927 }
1928
1929 static void
1930 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1931 {
1932         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1933         struct nfs_delegation *delegation;
1934         int delegation_flags = 0;
1935
1936         rcu_read_lock();
1937         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1938         if (delegation)
1939                 delegation_flags = delegation->flags;
1940         rcu_read_unlock();
1941         switch (data->o_arg.claim) {
1942         default:
1943                 break;
1944         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1945         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1946                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1947                                    "returning a delegation for "
1948                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1949                                    clp->cl_hostname);
1950                 return;
1951         }
1952         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1953                 nfs_inode_set_delegation(state->inode,
1954                                 data->owner->so_cred,
1955                                 data->o_res.delegation_type,
1956                                 &data->o_res.delegation,
1957                                 data->o_res.pagemod_limit);
1958         else
1959                 nfs_inode_reclaim_delegation(state->inode,
1960                                 data->owner->so_cred,
1961                                 data->o_res.delegation_type,
1962                                 &data->o_res.delegation,
1963                                 data->o_res.pagemod_limit);
1964
1965         if (data->o_res.do_recall)
1966                 nfs_async_inode_return_delegation(state->inode,
1967                                                   &data->o_res.delegation);
1968 }
1969
1970 /*
1971  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1972  * and update the nfs4_state.
1973  */
1974 static struct nfs4_state *
1975 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1976 {
1977         struct inode *inode = data->state->inode;
1978         struct nfs4_state *state = data->state;
1979         int ret;
1980
1981         if (!data->rpc_done) {
1982                 if (data->rpc_status)
1983                         return ERR_PTR(data->rpc_status);
1984                 return nfs4_try_open_cached(data);
1985         }
1986
1987         ret = nfs_refresh_inode(inode, &data->f_attr);
1988         if (ret)
1989                 return ERR_PTR(ret);
1990
1991         if (data->o_res.delegation_type != 0)
1992                 nfs4_opendata_check_deleg(data, state);
1993
1994         if (!update_open_stateid(state, &data->o_res.stateid,
1995                                 NULL, data->o_arg.fmode))
1996                 return ERR_PTR(-EAGAIN);
1997         refcount_inc(&state->count);
1998
1999         return state;
2000 }
2001
2002 static struct inode *
2003 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2004 {
2005         struct inode *inode;
2006
2007         switch (data->o_arg.claim) {
2008         case NFS4_OPEN_CLAIM_NULL:
2009         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2010         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2011                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2012                         return ERR_PTR(-EAGAIN);
2013                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2014                                 &data->f_attr);
2015                 break;
2016         default:
2017                 inode = d_inode(data->dentry);
2018                 ihold(inode);
2019                 nfs_refresh_inode(inode, &data->f_attr);
2020         }
2021         return inode;
2022 }
2023
2024 static struct nfs4_state *
2025 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2026 {
2027         struct nfs4_state *state;
2028         struct inode *inode;
2029
2030         inode = nfs4_opendata_get_inode(data);
2031         if (IS_ERR(inode))
2032                 return ERR_CAST(inode);
2033         if (data->state != NULL && data->state->inode == inode) {
2034                 state = data->state;
2035                 refcount_inc(&state->count);
2036         } else
2037                 state = nfs4_get_open_state(inode, data->owner);
2038         iput(inode);
2039         if (state == NULL)
2040                 state = ERR_PTR(-ENOMEM);
2041         return state;
2042 }
2043
2044 static struct nfs4_state *
2045 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2046 {
2047         struct nfs4_state *state;
2048
2049         if (!data->rpc_done) {
2050                 state = nfs4_try_open_cached(data);
2051                 trace_nfs4_cached_open(data->state);
2052                 goto out;
2053         }
2054
2055         state = nfs4_opendata_find_nfs4_state(data);
2056         if (IS_ERR(state))
2057                 goto out;
2058
2059         if (data->o_res.delegation_type != 0)
2060                 nfs4_opendata_check_deleg(data, state);
2061         if (!update_open_stateid(state, &data->o_res.stateid,
2062                                 NULL, data->o_arg.fmode)) {
2063                 nfs4_put_open_state(state);
2064                 state = ERR_PTR(-EAGAIN);
2065         }
2066 out:
2067         nfs_release_seqid(data->o_arg.seqid);
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 *ret;
2075
2076         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2077                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2078         else
2079                 ret = _nfs4_opendata_to_nfs4_state(data);
2080         nfs4_sequence_free_slot(&data->o_res.seq_res);
2081         return ret;
2082 }
2083
2084 static struct nfs_open_context *
2085 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2086 {
2087         struct nfs_inode *nfsi = NFS_I(state->inode);
2088         struct nfs_open_context *ctx;
2089
2090         rcu_read_lock();
2091         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2092                 if (ctx->state != state)
2093                         continue;
2094                 if ((ctx->mode & mode) != mode)
2095                         continue;
2096                 if (!get_nfs_open_context(ctx))
2097                         continue;
2098                 rcu_read_unlock();
2099                 return ctx;
2100         }
2101         rcu_read_unlock();
2102         return ERR_PTR(-ENOENT);
2103 }
2104
2105 static struct nfs_open_context *
2106 nfs4_state_find_open_context(struct nfs4_state *state)
2107 {
2108         struct nfs_open_context *ctx;
2109
2110         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2111         if (!IS_ERR(ctx))
2112                 return ctx;
2113         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2114         if (!IS_ERR(ctx))
2115                 return ctx;
2116         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2117 }
2118
2119 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2120                 struct nfs4_state *state, enum open_claim_type4 claim)
2121 {
2122         struct nfs4_opendata *opendata;
2123
2124         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2125                         NULL, claim, GFP_NOFS);
2126         if (opendata == NULL)
2127                 return ERR_PTR(-ENOMEM);
2128         opendata->state = state;
2129         refcount_inc(&state->count);
2130         return opendata;
2131 }
2132
2133 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2134                                     fmode_t fmode)
2135 {
2136         struct nfs4_state *newstate;
2137         struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2138         int openflags = opendata->o_arg.open_flags;
2139         int ret;
2140
2141         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2142                 return 0;
2143         opendata->o_arg.fmode = fmode;
2144         opendata->o_arg.share_access =
2145                 nfs4_map_atomic_open_share(server, fmode, openflags);
2146         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2147         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2148         nfs4_init_opendata_res(opendata);
2149         ret = _nfs4_recover_proc_open(opendata);
2150         if (ret != 0)
2151                 return ret;
2152         newstate = nfs4_opendata_to_nfs4_state(opendata);
2153         if (IS_ERR(newstate))
2154                 return PTR_ERR(newstate);
2155         if (newstate != opendata->state)
2156                 ret = -ESTALE;
2157         nfs4_close_state(newstate, fmode);
2158         return ret;
2159 }
2160
2161 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2162 {
2163         int ret;
2164
2165         /* memory barrier prior to reading state->n_* */
2166         smp_rmb();
2167         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2168         if (ret != 0)
2169                 return ret;
2170         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2171         if (ret != 0)
2172                 return ret;
2173         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2174         if (ret != 0)
2175                 return ret;
2176         /*
2177          * We may have performed cached opens for all three recoveries.
2178          * Check if we need to update the current stateid.
2179          */
2180         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2181             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2182                 write_seqlock(&state->seqlock);
2183                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2184                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2185                 write_sequnlock(&state->seqlock);
2186         }
2187         return 0;
2188 }
2189
2190 /*
2191  * OPEN_RECLAIM:
2192  *      reclaim state on the server after a reboot.
2193  */
2194 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2195 {
2196         struct nfs_delegation *delegation;
2197         struct nfs4_opendata *opendata;
2198         fmode_t delegation_type = 0;
2199         int status;
2200
2201         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2202                         NFS4_OPEN_CLAIM_PREVIOUS);
2203         if (IS_ERR(opendata))
2204                 return PTR_ERR(opendata);
2205         rcu_read_lock();
2206         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2207         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2208                 delegation_type = delegation->type;
2209         rcu_read_unlock();
2210         opendata->o_arg.u.delegation_type = delegation_type;
2211         status = nfs4_open_recover(opendata, state);
2212         nfs4_opendata_put(opendata);
2213         return status;
2214 }
2215
2216 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2217 {
2218         struct nfs_server *server = NFS_SERVER(state->inode);
2219         struct nfs4_exception exception = { };
2220         int err;
2221         do {
2222                 err = _nfs4_do_open_reclaim(ctx, state);
2223                 trace_nfs4_open_reclaim(ctx, 0, err);
2224                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2225                         continue;
2226                 if (err != -NFS4ERR_DELAY)
2227                         break;
2228                 nfs4_handle_exception(server, err, &exception);
2229         } while (exception.retry);
2230         return err;
2231 }
2232
2233 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2234 {
2235         struct nfs_open_context *ctx;
2236         int ret;
2237
2238         ctx = nfs4_state_find_open_context(state);
2239         if (IS_ERR(ctx))
2240                 return -EAGAIN;
2241         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2242         nfs_state_clear_open_state_flags(state);
2243         ret = nfs4_do_open_reclaim(ctx, state);
2244         put_nfs_open_context(ctx);
2245         return ret;
2246 }
2247
2248 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)
2249 {
2250         switch (err) {
2251                 default:
2252                         printk(KERN_ERR "NFS: %s: unhandled error "
2253                                         "%d.\n", __func__, err);
2254                         fallthrough;
2255                 case 0:
2256                 case -ENOENT:
2257                 case -EAGAIN:
2258                 case -ESTALE:
2259                 case -ETIMEDOUT:
2260                         break;
2261                 case -NFS4ERR_BADSESSION:
2262                 case -NFS4ERR_BADSLOT:
2263                 case -NFS4ERR_BAD_HIGH_SLOT:
2264                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2265                 case -NFS4ERR_DEADSESSION:
2266                         return -EAGAIN;
2267                 case -NFS4ERR_STALE_CLIENTID:
2268                 case -NFS4ERR_STALE_STATEID:
2269                         /* Don't recall a delegation if it was lost */
2270                         nfs4_schedule_lease_recovery(server->nfs_client);
2271                         return -EAGAIN;
2272                 case -NFS4ERR_MOVED:
2273                         nfs4_schedule_migration_recovery(server);
2274                         return -EAGAIN;
2275                 case -NFS4ERR_LEASE_MOVED:
2276                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2277                         return -EAGAIN;
2278                 case -NFS4ERR_DELEG_REVOKED:
2279                 case -NFS4ERR_ADMIN_REVOKED:
2280                 case -NFS4ERR_EXPIRED:
2281                 case -NFS4ERR_BAD_STATEID:
2282                 case -NFS4ERR_OPENMODE:
2283                         nfs_inode_find_state_and_recover(state->inode,
2284                                         stateid);
2285                         nfs4_schedule_stateid_recovery(server, state);
2286                         return -EAGAIN;
2287                 case -NFS4ERR_DELAY:
2288                 case -NFS4ERR_GRACE:
2289                         ssleep(1);
2290                         return -EAGAIN;
2291                 case -ENOMEM:
2292                 case -NFS4ERR_DENIED:
2293                         if (fl) {
2294                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2295                                 if (lsp)
2296                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2297                         }
2298                         return 0;
2299         }
2300         return err;
2301 }
2302
2303 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2304                 struct nfs4_state *state, const nfs4_stateid *stateid)
2305 {
2306         struct nfs_server *server = NFS_SERVER(state->inode);
2307         struct nfs4_opendata *opendata;
2308         int err = 0;
2309
2310         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2311                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2312         if (IS_ERR(opendata))
2313                 return PTR_ERR(opendata);
2314         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2315         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2316                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2317                 if (err)
2318                         goto out;
2319         }
2320         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2321                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2322                 if (err)
2323                         goto out;
2324         }
2325         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2326                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2327                 if (err)
2328                         goto out;
2329         }
2330         nfs_state_clear_delegation(state);
2331 out:
2332         nfs4_opendata_put(opendata);
2333         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2334 }
2335
2336 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2337 {
2338         struct nfs4_opendata *data = calldata;
2339
2340         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2341                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2342 }
2343
2344 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2345 {
2346         struct nfs4_opendata *data = calldata;
2347
2348         nfs40_sequence_done(task, &data->c_res.seq_res);
2349
2350         data->rpc_status = task->tk_status;
2351         if (data->rpc_status == 0) {
2352                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2353                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2354                 renew_lease(data->o_res.server, data->timestamp);
2355                 data->rpc_done = true;
2356         }
2357 }
2358
2359 static void nfs4_open_confirm_release(void *calldata)
2360 {
2361         struct nfs4_opendata *data = calldata;
2362         struct nfs4_state *state = NULL;
2363
2364         /* If this request hasn't been cancelled, do nothing */
2365         if (!data->cancelled)
2366                 goto out_free;
2367         /* In case of error, no cleanup! */
2368         if (!data->rpc_done)
2369                 goto out_free;
2370         state = nfs4_opendata_to_nfs4_state(data);
2371         if (!IS_ERR(state))
2372                 nfs4_close_state(state, data->o_arg.fmode);
2373 out_free:
2374         nfs4_opendata_put(data);
2375 }
2376
2377 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2378         .rpc_call_prepare = nfs4_open_confirm_prepare,
2379         .rpc_call_done = nfs4_open_confirm_done,
2380         .rpc_release = nfs4_open_confirm_release,
2381 };
2382
2383 /*
2384  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2385  */
2386 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2387 {
2388         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2389         struct rpc_task *task;
2390         struct  rpc_message msg = {
2391                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2392                 .rpc_argp = &data->c_arg,
2393                 .rpc_resp = &data->c_res,
2394                 .rpc_cred = data->owner->so_cred,
2395         };
2396         struct rpc_task_setup task_setup_data = {
2397                 .rpc_client = server->client,
2398                 .rpc_message = &msg,
2399                 .callback_ops = &nfs4_open_confirm_ops,
2400                 .callback_data = data,
2401                 .workqueue = nfsiod_workqueue,
2402                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2403         };
2404         int status;
2405
2406         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2407                                 data->is_recover);
2408         kref_get(&data->kref);
2409         data->rpc_done = false;
2410         data->rpc_status = 0;
2411         data->timestamp = jiffies;
2412         task = rpc_run_task(&task_setup_data);
2413         if (IS_ERR(task))
2414                 return PTR_ERR(task);
2415         status = rpc_wait_for_completion_task(task);
2416         if (status != 0) {
2417                 data->cancelled = true;
2418                 smp_wmb();
2419         } else
2420                 status = data->rpc_status;
2421         rpc_put_task(task);
2422         return status;
2423 }
2424
2425 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2426 {
2427         struct nfs4_opendata *data = calldata;
2428         struct nfs4_state_owner *sp = data->owner;
2429         struct nfs_client *clp = sp->so_server->nfs_client;
2430         enum open_claim_type4 claim = data->o_arg.claim;
2431
2432         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2433                 goto out_wait;
2434         /*
2435          * Check if we still need to send an OPEN call, or if we can use
2436          * a delegation instead.
2437          */
2438         if (data->state != NULL) {
2439                 struct nfs_delegation *delegation;
2440
2441                 if (can_open_cached(data->state, data->o_arg.fmode,
2442                                         data->o_arg.open_flags, claim))
2443                         goto out_no_action;
2444                 rcu_read_lock();
2445                 delegation = nfs4_get_valid_delegation(data->state->inode);
2446                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2447                         goto unlock_no_action;
2448                 rcu_read_unlock();
2449         }
2450         /* Update client id. */
2451         data->o_arg.clientid = clp->cl_clientid;
2452         switch (claim) {
2453         default:
2454                 break;
2455         case NFS4_OPEN_CLAIM_PREVIOUS:
2456         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2457         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2458                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2459                 fallthrough;
2460         case NFS4_OPEN_CLAIM_FH:
2461                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2462         }
2463         data->timestamp = jiffies;
2464         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2465                                 &data->o_arg.seq_args,
2466                                 &data->o_res.seq_res,
2467                                 task) != 0)
2468                 nfs_release_seqid(data->o_arg.seqid);
2469
2470         /* Set the create mode (note dependency on the session type) */
2471         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2472         if (data->o_arg.open_flags & O_EXCL) {
2473                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2474                 if (clp->cl_mvops->minor_version == 0) {
2475                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2476                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2477                          * because ACCESS will return permission denied for
2478                          * all bits until close */
2479                         data->o_res.access_request = data->o_arg.access = 0;
2480                 } else if (nfs4_has_persistent_session(clp))
2481                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2482         }
2483         return;
2484 unlock_no_action:
2485         trace_nfs4_cached_open(data->state);
2486         rcu_read_unlock();
2487 out_no_action:
2488         task->tk_action = NULL;
2489 out_wait:
2490         nfs4_sequence_done(task, &data->o_res.seq_res);
2491 }
2492
2493 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2494 {
2495         struct nfs4_opendata *data = calldata;
2496
2497         data->rpc_status = task->tk_status;
2498
2499         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2500                 return;
2501
2502         if (task->tk_status == 0) {
2503                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2504                         switch (data->o_res.f_attr->mode & S_IFMT) {
2505                         case S_IFREG:
2506                                 break;
2507                         case S_IFLNK:
2508                                 data->rpc_status = -ELOOP;
2509                                 break;
2510                         case S_IFDIR:
2511                                 data->rpc_status = -EISDIR;
2512                                 break;
2513                         default:
2514                                 data->rpc_status = -ENOTDIR;
2515                         }
2516                 }
2517                 renew_lease(data->o_res.server, data->timestamp);
2518                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2519                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2520         }
2521         data->rpc_done = true;
2522 }
2523
2524 static void nfs4_open_release(void *calldata)
2525 {
2526         struct nfs4_opendata *data = calldata;
2527         struct nfs4_state *state = NULL;
2528
2529         /* If this request hasn't been cancelled, do nothing */
2530         if (!data->cancelled)
2531                 goto out_free;
2532         /* In case of error, no cleanup! */
2533         if (data->rpc_status != 0 || !data->rpc_done)
2534                 goto out_free;
2535         /* In case we need an open_confirm, no cleanup! */
2536         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2537                 goto out_free;
2538         state = nfs4_opendata_to_nfs4_state(data);
2539         if (!IS_ERR(state))
2540                 nfs4_close_state(state, data->o_arg.fmode);
2541 out_free:
2542         nfs4_opendata_put(data);
2543 }
2544
2545 static const struct rpc_call_ops nfs4_open_ops = {
2546         .rpc_call_prepare = nfs4_open_prepare,
2547         .rpc_call_done = nfs4_open_done,
2548         .rpc_release = nfs4_open_release,
2549 };
2550
2551 static int nfs4_run_open_task(struct nfs4_opendata *data,
2552                               struct nfs_open_context *ctx)
2553 {
2554         struct inode *dir = d_inode(data->dir);
2555         struct nfs_server *server = NFS_SERVER(dir);
2556         struct nfs_openargs *o_arg = &data->o_arg;
2557         struct nfs_openres *o_res = &data->o_res;
2558         struct rpc_task *task;
2559         struct rpc_message msg = {
2560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2561                 .rpc_argp = o_arg,
2562                 .rpc_resp = o_res,
2563                 .rpc_cred = data->owner->so_cred,
2564         };
2565         struct rpc_task_setup task_setup_data = {
2566                 .rpc_client = server->client,
2567                 .rpc_message = &msg,
2568                 .callback_ops = &nfs4_open_ops,
2569                 .callback_data = data,
2570                 .workqueue = nfsiod_workqueue,
2571                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2572         };
2573         int status;
2574
2575         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2576                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2577
2578         kref_get(&data->kref);
2579         data->rpc_done = false;
2580         data->rpc_status = 0;
2581         data->cancelled = false;
2582         data->is_recover = false;
2583         if (!ctx) {
2584                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2585                 data->is_recover = true;
2586                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2587         } else {
2588                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2589                 pnfs_lgopen_prepare(data, ctx);
2590         }
2591         task = rpc_run_task(&task_setup_data);
2592         if (IS_ERR(task))
2593                 return PTR_ERR(task);
2594         status = rpc_wait_for_completion_task(task);
2595         if (status != 0) {
2596                 data->cancelled = true;
2597                 smp_wmb();
2598         } else
2599                 status = data->rpc_status;
2600         rpc_put_task(task);
2601
2602         return status;
2603 }
2604
2605 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2606 {
2607         struct inode *dir = d_inode(data->dir);
2608         struct nfs_openres *o_res = &data->o_res;
2609         int status;
2610
2611         status = nfs4_run_open_task(data, NULL);
2612         if (status != 0 || !data->rpc_done)
2613                 return status;
2614
2615         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2616
2617         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2618                 status = _nfs4_proc_open_confirm(data);
2619
2620         return status;
2621 }
2622
2623 /*
2624  * Additional permission checks in order to distinguish between an
2625  * open for read, and an open for execute. This works around the
2626  * fact that NFSv4 OPEN treats read and execute permissions as being
2627  * the same.
2628  * Note that in the non-execute case, we want to turn off permission
2629  * checking if we just created a new file (POSIX open() semantics).
2630  */
2631 static int nfs4_opendata_access(const struct cred *cred,
2632                                 struct nfs4_opendata *opendata,
2633                                 struct nfs4_state *state, fmode_t fmode)
2634 {
2635         struct nfs_access_entry cache;
2636         u32 mask, flags;
2637
2638         /* access call failed or for some reason the server doesn't
2639          * support any access modes -- defer access call until later */
2640         if (opendata->o_res.access_supported == 0)
2641                 return 0;
2642
2643         mask = 0;
2644         if (fmode & FMODE_EXEC) {
2645                 /* ONLY check for exec rights */
2646                 if (S_ISDIR(state->inode->i_mode))
2647                         mask = NFS4_ACCESS_LOOKUP;
2648                 else
2649                         mask = NFS4_ACCESS_EXECUTE;
2650         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2651                 mask = NFS4_ACCESS_READ;
2652
2653         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2654         nfs_access_add_cache(state->inode, &cache, cred);
2655
2656         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2657         if ((mask & ~cache.mask & flags) == 0)
2658                 return 0;
2659
2660         return -EACCES;
2661 }
2662
2663 /*
2664  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2665  */
2666 static int _nfs4_proc_open(struct nfs4_opendata *data,
2667                            struct nfs_open_context *ctx)
2668 {
2669         struct inode *dir = d_inode(data->dir);
2670         struct nfs_server *server = NFS_SERVER(dir);
2671         struct nfs_openargs *o_arg = &data->o_arg;
2672         struct nfs_openres *o_res = &data->o_res;
2673         int status;
2674
2675         status = nfs4_run_open_task(data, ctx);
2676         if (!data->rpc_done)
2677                 return status;
2678         if (status != 0) {
2679                 if (status == -NFS4ERR_BADNAME &&
2680                                 !(o_arg->open_flags & O_CREAT))
2681                         return -ENOENT;
2682                 return status;
2683         }
2684
2685         nfs_fattr_map_and_free_names(server, &data->f_attr);
2686
2687         if (o_arg->open_flags & O_CREAT) {
2688                 if (o_arg->open_flags & O_EXCL)
2689                         data->file_created = true;
2690                 else if (o_res->cinfo.before != o_res->cinfo.after)
2691                         data->file_created = true;
2692                 if (data->file_created ||
2693                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2694                         nfs4_update_changeattr(dir, &o_res->cinfo,
2695                                         o_res->f_attr->time_start,
2696                                         NFS_INO_INVALID_DATA);
2697         }
2698         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2699                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2700         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2701                 status = _nfs4_proc_open_confirm(data);
2702                 if (status != 0)
2703                         return status;
2704         }
2705         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2706                 nfs4_sequence_free_slot(&o_res->seq_res);
2707                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL);
2708         }
2709         return 0;
2710 }
2711
2712 /*
2713  * OPEN_EXPIRED:
2714  *      reclaim state on the server after a network partition.
2715  *      Assumes caller holds the appropriate lock
2716  */
2717 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2718 {
2719         struct nfs4_opendata *opendata;
2720         int ret;
2721
2722         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2723         if (IS_ERR(opendata))
2724                 return PTR_ERR(opendata);
2725         /*
2726          * We're not recovering a delegation, so ask for no delegation.
2727          * Otherwise the recovery thread could deadlock with an outstanding
2728          * delegation return.
2729          */
2730         opendata->o_arg.open_flags = O_DIRECT;
2731         ret = nfs4_open_recover(opendata, state);
2732         if (ret == -ESTALE)
2733                 d_drop(ctx->dentry);
2734         nfs4_opendata_put(opendata);
2735         return ret;
2736 }
2737
2738 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2739 {
2740         struct nfs_server *server = NFS_SERVER(state->inode);
2741         struct nfs4_exception exception = { };
2742         int err;
2743
2744         do {
2745                 err = _nfs4_open_expired(ctx, state);
2746                 trace_nfs4_open_expired(ctx, 0, err);
2747                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2748                         continue;
2749                 switch (err) {
2750                 default:
2751                         goto out;
2752                 case -NFS4ERR_GRACE:
2753                 case -NFS4ERR_DELAY:
2754                         nfs4_handle_exception(server, err, &exception);
2755                         err = 0;
2756                 }
2757         } while (exception.retry);
2758 out:
2759         return err;
2760 }
2761
2762 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2763 {
2764         struct nfs_open_context *ctx;
2765         int ret;
2766
2767         ctx = nfs4_state_find_open_context(state);
2768         if (IS_ERR(ctx))
2769                 return -EAGAIN;
2770         ret = nfs4_do_open_expired(ctx, state);
2771         put_nfs_open_context(ctx);
2772         return ret;
2773 }
2774
2775 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2776                 const nfs4_stateid *stateid)
2777 {
2778         nfs_remove_bad_delegation(state->inode, stateid);
2779         nfs_state_clear_delegation(state);
2780 }
2781
2782 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2783 {
2784         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2785                 nfs_finish_clear_delegation_stateid(state, NULL);
2786 }
2787
2788 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2789 {
2790         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2791         nfs40_clear_delegation_stateid(state);
2792         nfs_state_clear_open_state_flags(state);
2793         return nfs4_open_expired(sp, state);
2794 }
2795
2796 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2797                 nfs4_stateid *stateid,
2798                 const struct cred *cred)
2799 {
2800         return -NFS4ERR_BAD_STATEID;
2801 }
2802
2803 #if defined(CONFIG_NFS_V4_1)
2804 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2805                 nfs4_stateid *stateid,
2806                 const struct cred *cred)
2807 {
2808         int status;
2809
2810         switch (stateid->type) {
2811         default:
2812                 break;
2813         case NFS4_INVALID_STATEID_TYPE:
2814         case NFS4_SPECIAL_STATEID_TYPE:
2815                 return -NFS4ERR_BAD_STATEID;
2816         case NFS4_REVOKED_STATEID_TYPE:
2817                 goto out_free;
2818         }
2819
2820         status = nfs41_test_stateid(server, stateid, cred);
2821         switch (status) {
2822         case -NFS4ERR_EXPIRED:
2823         case -NFS4ERR_ADMIN_REVOKED:
2824         case -NFS4ERR_DELEG_REVOKED:
2825                 break;
2826         default:
2827                 return status;
2828         }
2829 out_free:
2830         /* Ack the revoked state to the server */
2831         nfs41_free_stateid(server, stateid, cred, true);
2832         return -NFS4ERR_EXPIRED;
2833 }
2834
2835 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2836 {
2837         struct nfs_server *server = NFS_SERVER(state->inode);
2838         nfs4_stateid stateid;
2839         struct nfs_delegation *delegation;
2840         const struct cred *cred = NULL;
2841         int status, ret = NFS_OK;
2842
2843         /* Get the delegation credential for use by test/free_stateid */
2844         rcu_read_lock();
2845         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2846         if (delegation == NULL) {
2847                 rcu_read_unlock();
2848                 nfs_state_clear_delegation(state);
2849                 return NFS_OK;
2850         }
2851
2852         spin_lock(&delegation->lock);
2853         nfs4_stateid_copy(&stateid, &delegation->stateid);
2854
2855         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2856                                 &delegation->flags)) {
2857                 spin_unlock(&delegation->lock);
2858                 rcu_read_unlock();
2859                 return NFS_OK;
2860         }
2861
2862         if (delegation->cred)
2863                 cred = get_cred(delegation->cred);
2864         spin_unlock(&delegation->lock);
2865         rcu_read_unlock();
2866         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2867         trace_nfs4_test_delegation_stateid(state, NULL, status);
2868         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2869                 nfs_finish_clear_delegation_stateid(state, &stateid);
2870         else
2871                 ret = status;
2872
2873         put_cred(cred);
2874         return ret;
2875 }
2876
2877 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2878 {
2879         nfs4_stateid tmp;
2880
2881         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2882             nfs4_copy_delegation_stateid(state->inode, state->state,
2883                                 &tmp, NULL) &&
2884             nfs4_stateid_match_other(&state->stateid, &tmp))
2885                 nfs_state_set_delegation(state, &tmp, state->state);
2886         else
2887                 nfs_state_clear_delegation(state);
2888 }
2889
2890 /**
2891  * nfs41_check_expired_locks - possibly free a lock stateid
2892  *
2893  * @state: NFSv4 state for an inode
2894  *
2895  * Returns NFS_OK if recovery for this stateid is now finished.
2896  * Otherwise a negative NFS4ERR value is returned.
2897  */
2898 static int nfs41_check_expired_locks(struct nfs4_state *state)
2899 {
2900         int status, ret = NFS_OK;
2901         struct nfs4_lock_state *lsp, *prev = NULL;
2902         struct nfs_server *server = NFS_SERVER(state->inode);
2903
2904         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2905                 goto out;
2906
2907         spin_lock(&state->state_lock);
2908         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2909                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2910                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2911
2912                         refcount_inc(&lsp->ls_count);
2913                         spin_unlock(&state->state_lock);
2914
2915                         nfs4_put_lock_state(prev);
2916                         prev = lsp;
2917
2918                         status = nfs41_test_and_free_expired_stateid(server,
2919                                         &lsp->ls_stateid,
2920                                         cred);
2921                         trace_nfs4_test_lock_stateid(state, lsp, status);
2922                         if (status == -NFS4ERR_EXPIRED ||
2923                             status == -NFS4ERR_BAD_STATEID) {
2924                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2925                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2926                                 if (!recover_lost_locks)
2927                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2928                         } else if (status != NFS_OK) {
2929                                 ret = status;
2930                                 nfs4_put_lock_state(prev);
2931                                 goto out;
2932                         }
2933                         spin_lock(&state->state_lock);
2934                 }
2935         }
2936         spin_unlock(&state->state_lock);
2937         nfs4_put_lock_state(prev);
2938 out:
2939         return ret;
2940 }
2941
2942 /**
2943  * nfs41_check_open_stateid - possibly free an open stateid
2944  *
2945  * @state: NFSv4 state for an inode
2946  *
2947  * Returns NFS_OK if recovery for this stateid is now finished.
2948  * Otherwise a negative NFS4ERR value is returned.
2949  */
2950 static int nfs41_check_open_stateid(struct nfs4_state *state)
2951 {
2952         struct nfs_server *server = NFS_SERVER(state->inode);
2953         nfs4_stateid *stateid = &state->open_stateid;
2954         const struct cred *cred = state->owner->so_cred;
2955         int status;
2956
2957         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2958                 return -NFS4ERR_BAD_STATEID;
2959         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2960         trace_nfs4_test_open_stateid(state, NULL, status);
2961         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2962                 nfs_state_clear_open_state_flags(state);
2963                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2964                 return status;
2965         }
2966         if (nfs_open_stateid_recover_openmode(state))
2967                 return -NFS4ERR_OPENMODE;
2968         return NFS_OK;
2969 }
2970
2971 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2972 {
2973         int status;
2974
2975         status = nfs41_check_delegation_stateid(state);
2976         if (status != NFS_OK)
2977                 return status;
2978         nfs41_delegation_recover_stateid(state);
2979
2980         status = nfs41_check_expired_locks(state);
2981         if (status != NFS_OK)
2982                 return status;
2983         status = nfs41_check_open_stateid(state);
2984         if (status != NFS_OK)
2985                 status = nfs4_open_expired(sp, state);
2986         return status;
2987 }
2988 #endif
2989
2990 /*
2991  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2992  * fields corresponding to attributes that were used to store the verifier.
2993  * Make sure we clobber those fields in the later setattr call
2994  */
2995 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2996                                 struct iattr *sattr, struct nfs4_label **label)
2997 {
2998         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2999         __u32 attrset[3];
3000         unsigned ret;
3001         unsigned i;
3002
3003         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3004                 attrset[i] = opendata->o_res.attrset[i];
3005                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3006                         attrset[i] &= ~bitmask[i];
3007         }
3008
3009         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3010                 sattr->ia_valid : 0;
3011
3012         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3013                 if (sattr->ia_valid & ATTR_ATIME_SET)
3014                         ret |= ATTR_ATIME_SET;
3015                 else
3016                         ret |= ATTR_ATIME;
3017         }
3018
3019         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3020                 if (sattr->ia_valid & ATTR_MTIME_SET)
3021                         ret |= ATTR_MTIME_SET;
3022                 else
3023                         ret |= ATTR_MTIME;
3024         }
3025
3026         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3027                 *label = NULL;
3028         return ret;
3029 }
3030
3031 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3032                 struct nfs_open_context *ctx)
3033 {
3034         struct nfs4_state_owner *sp = opendata->owner;
3035         struct nfs_server *server = sp->so_server;
3036         struct dentry *dentry;
3037         struct nfs4_state *state;
3038         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3039         struct inode *dir = d_inode(opendata->dir);
3040         unsigned long dir_verifier;
3041         unsigned int seq;
3042         int ret;
3043
3044         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3045         dir_verifier = nfs_save_change_attribute(dir);
3046
3047         ret = _nfs4_proc_open(opendata, ctx);
3048         if (ret != 0)
3049                 goto out;
3050
3051         state = _nfs4_opendata_to_nfs4_state(opendata);
3052         ret = PTR_ERR(state);
3053         if (IS_ERR(state))
3054                 goto out;
3055         ctx->state = state;
3056         if (server->caps & NFS_CAP_POSIX_LOCK)
3057                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3058         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3059                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3060         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3061                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3062
3063         dentry = opendata->dentry;
3064         if (d_really_is_negative(dentry)) {
3065                 struct dentry *alias;
3066                 d_drop(dentry);
3067                 alias = d_exact_alias(dentry, state->inode);
3068                 if (!alias)
3069                         alias = d_splice_alias(igrab(state->inode), dentry);
3070                 /* d_splice_alias() can't fail here - it's a non-directory */
3071                 if (alias) {
3072                         dput(ctx->dentry);
3073                         ctx->dentry = dentry = alias;
3074                 }
3075         }
3076
3077         switch(opendata->o_arg.claim) {
3078         default:
3079                 break;
3080         case NFS4_OPEN_CLAIM_NULL:
3081         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3082         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3083                 if (!opendata->rpc_done)
3084                         break;
3085                 if (opendata->o_res.delegation_type != 0)
3086                         dir_verifier = nfs_save_change_attribute(dir);
3087                 nfs_set_verifier(dentry, dir_verifier);
3088         }
3089
3090         /* Parse layoutget results before we check for access */
3091         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3092
3093         ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3094         if (ret != 0)
3095                 goto out;
3096
3097         if (d_inode(dentry) == state->inode) {
3098                 nfs_inode_attach_open_context(ctx);
3099                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3100                         nfs4_schedule_stateid_recovery(server, state);
3101         }
3102
3103 out:
3104         if (!opendata->cancelled) {
3105                 if (opendata->lgp) {
3106                         nfs4_lgopen_release(opendata->lgp);
3107                         opendata->lgp = NULL;
3108                 }
3109                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3110         }
3111         return ret;
3112 }
3113
3114 /*
3115  * Returns a referenced nfs4_state
3116  */
3117 static int _nfs4_do_open(struct inode *dir,
3118                         struct nfs_open_context *ctx,
3119                         int flags,
3120                         const struct nfs4_open_createattrs *c,
3121                         int *opened)
3122 {
3123         struct nfs4_state_owner  *sp;
3124         struct nfs4_state     *state = NULL;
3125         struct nfs_server       *server = NFS_SERVER(dir);
3126         struct nfs4_opendata *opendata;
3127         struct dentry *dentry = ctx->dentry;
3128         const struct cred *cred = ctx->cred;
3129         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3130         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3131         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3132         struct iattr *sattr = c->sattr;
3133         struct nfs4_label *label = c->label;
3134         int status;
3135
3136         /* Protect against reboot recovery conflicts */
3137         status = -ENOMEM;
3138         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3139         if (sp == NULL) {
3140                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3141                 goto out_err;
3142         }
3143         status = nfs4_client_recover_expired_lease(server->nfs_client);
3144         if (status != 0)
3145                 goto err_put_state_owner;
3146         if (d_really_is_positive(dentry))
3147                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3148         status = -ENOMEM;
3149         if (d_really_is_positive(dentry))
3150                 claim = NFS4_OPEN_CLAIM_FH;
3151         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3152                         c, claim, GFP_KERNEL);
3153         if (opendata == NULL)
3154                 goto err_put_state_owner;
3155
3156         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3157                 if (!opendata->f_attr.mdsthreshold) {
3158                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3159                         if (!opendata->f_attr.mdsthreshold)
3160                                 goto err_opendata_put;
3161                 }
3162                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3163         }
3164         if (d_really_is_positive(dentry))
3165                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3166
3167         status = _nfs4_open_and_get_state(opendata, ctx);
3168         if (status != 0)
3169                 goto err_opendata_put;
3170         state = ctx->state;
3171
3172         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3173             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3174                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3175                 /*
3176                  * send create attributes which was not set by open
3177                  * with an extra setattr.
3178                  */
3179                 if (attrs || label) {
3180                         unsigned ia_old = sattr->ia_valid;
3181
3182                         sattr->ia_valid = attrs;
3183                         nfs_fattr_init(opendata->o_res.f_attr);
3184                         status = nfs4_do_setattr(state->inode, cred,
3185                                         opendata->o_res.f_attr, sattr,
3186                                         ctx, label);
3187                         if (status == 0) {
3188                                 nfs_setattr_update_inode(state->inode, sattr,
3189                                                 opendata->o_res.f_attr);
3190                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3191                         }
3192                         sattr->ia_valid = ia_old;
3193                 }
3194         }
3195         if (opened && opendata->file_created)
3196                 *opened = 1;
3197
3198         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3199                 *ctx_th = opendata->f_attr.mdsthreshold;
3200                 opendata->f_attr.mdsthreshold = NULL;
3201         }
3202
3203         nfs4_opendata_put(opendata);
3204         nfs4_put_state_owner(sp);
3205         return 0;
3206 err_opendata_put:
3207         nfs4_opendata_put(opendata);
3208 err_put_state_owner:
3209         nfs4_put_state_owner(sp);
3210 out_err:
3211         return status;
3212 }
3213
3214
3215 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3216                                         struct nfs_open_context *ctx,
3217                                         int flags,
3218                                         struct iattr *sattr,
3219                                         struct nfs4_label *label,
3220                                         int *opened)
3221 {
3222         struct nfs_server *server = NFS_SERVER(dir);
3223         struct nfs4_exception exception = {
3224                 .interruptible = true,
3225         };
3226         struct nfs4_state *res;
3227         struct nfs4_open_createattrs c = {
3228                 .label = label,
3229                 .sattr = sattr,
3230                 .verf = {
3231                         [0] = (__u32)jiffies,
3232                         [1] = (__u32)current->pid,
3233                 },
3234         };
3235         int status;
3236
3237         do {
3238                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3239                 res = ctx->state;
3240                 trace_nfs4_open_file(ctx, flags, status);
3241                 if (status == 0)
3242                         break;
3243                 /* NOTE: BAD_SEQID means the server and client disagree about the
3244                  * book-keeping w.r.t. state-changing operations
3245                  * (OPEN/CLOSE/LOCK/LOCKU...)
3246                  * It is actually a sign of a bug on the client or on the server.
3247                  *
3248                  * If we receive a BAD_SEQID error in the particular case of
3249                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3250                  * have unhashed the old state_owner for us, and that we can
3251                  * therefore safely retry using a new one. We should still warn
3252                  * the user though...
3253                  */
3254                 if (status == -NFS4ERR_BAD_SEQID) {
3255                         pr_warn_ratelimited("NFS: v4 server %s "
3256                                         " returned a bad sequence-id error!\n",
3257                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3258                         exception.retry = 1;
3259                         continue;
3260                 }
3261                 /*
3262                  * BAD_STATEID on OPEN means that the server cancelled our
3263                  * state before it received the OPEN_CONFIRM.
3264                  * Recover by retrying the request as per the discussion
3265                  * on Page 181 of RFC3530.
3266                  */
3267                 if (status == -NFS4ERR_BAD_STATEID) {
3268                         exception.retry = 1;
3269                         continue;
3270                 }
3271                 if (status == -NFS4ERR_EXPIRED) {
3272                         nfs4_schedule_lease_recovery(server->nfs_client);
3273                         exception.retry = 1;
3274                         continue;
3275                 }
3276                 if (status == -EAGAIN) {
3277                         /* We must have found a delegation */
3278                         exception.retry = 1;
3279                         continue;
3280                 }
3281                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3282                         continue;
3283                 res = ERR_PTR(nfs4_handle_exception(server,
3284                                         status, &exception));
3285         } while (exception.retry);
3286         return res;
3287 }
3288
3289 static int _nfs4_do_setattr(struct inode *inode,
3290                             struct nfs_setattrargs *arg,
3291                             struct nfs_setattrres *res,
3292                             const struct cred *cred,
3293                             struct nfs_open_context *ctx)
3294 {
3295         struct nfs_server *server = NFS_SERVER(inode);
3296         struct rpc_message msg = {
3297                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3298                 .rpc_argp       = arg,
3299                 .rpc_resp       = res,
3300                 .rpc_cred       = cred,
3301         };
3302         const struct cred *delegation_cred = NULL;
3303         unsigned long timestamp = jiffies;
3304         bool truncate;
3305         int status;
3306
3307         nfs_fattr_init(res->fattr);
3308
3309         /* Servers should only apply open mode checks for file size changes */
3310         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3311         if (!truncate) {
3312                 nfs4_inode_make_writeable(inode);
3313                 goto zero_stateid;
3314         }
3315
3316         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3317                 /* Use that stateid */
3318         } else if (ctx != NULL && ctx->state) {
3319                 struct nfs_lock_context *l_ctx;
3320                 if (!nfs4_valid_open_stateid(ctx->state))
3321                         return -EBADF;
3322                 l_ctx = nfs_get_lock_context(ctx);
3323                 if (IS_ERR(l_ctx))
3324                         return PTR_ERR(l_ctx);
3325                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3326                                                 &arg->stateid, &delegation_cred);
3327                 nfs_put_lock_context(l_ctx);
3328                 if (status == -EIO)
3329                         return -EBADF;
3330                 else if (status == -EAGAIN)
3331                         goto zero_stateid;
3332         } else {
3333 zero_stateid:
3334                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3335         }
3336         if (delegation_cred)
3337                 msg.rpc_cred = delegation_cred;
3338
3339         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3340
3341         put_cred(delegation_cred);
3342         if (status == 0 && ctx != NULL)
3343                 renew_lease(server, timestamp);
3344         trace_nfs4_setattr(inode, &arg->stateid, status);
3345         return status;
3346 }
3347
3348 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3349                            struct nfs_fattr *fattr, struct iattr *sattr,
3350                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3351 {
3352         struct nfs_server *server = NFS_SERVER(inode);
3353         __u32 bitmask[NFS4_BITMASK_SZ];
3354         struct nfs4_state *state = ctx ? ctx->state : NULL;
3355         struct nfs_setattrargs  arg = {
3356                 .fh             = NFS_FH(inode),
3357                 .iap            = sattr,
3358                 .server         = server,
3359                 .bitmask = bitmask,
3360                 .label          = ilabel,
3361         };
3362         struct nfs_setattrres  res = {
3363                 .fattr          = fattr,
3364                 .server         = server,
3365         };
3366         struct nfs4_exception exception = {
3367                 .state = state,
3368                 .inode = inode,
3369                 .stateid = &arg.stateid,
3370         };
3371         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3372         int err;
3373
3374         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3375                 adjust_flags |= NFS_INO_INVALID_MODE;
3376         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3377                 adjust_flags |= NFS_INO_INVALID_OTHER;
3378
3379         do {
3380                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3381                                         inode, adjust_flags);
3382
3383                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3384                 switch (err) {
3385                 case -NFS4ERR_OPENMODE:
3386                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3387                                 pr_warn_once("NFSv4: server %s is incorrectly "
3388                                                 "applying open mode checks to "
3389                                                 "a SETATTR that is not "
3390                                                 "changing file size.\n",
3391                                                 server->nfs_client->cl_hostname);
3392                         }
3393                         if (state && !(state->state & FMODE_WRITE)) {
3394                                 err = -EBADF;
3395                                 if (sattr->ia_valid & ATTR_OPEN)
3396                                         err = -EACCES;
3397                                 goto out;
3398                         }
3399                 }
3400                 err = nfs4_handle_exception(server, err, &exception);
3401         } while (exception.retry);
3402 out:
3403         return err;
3404 }
3405
3406 static bool
3407 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3408 {
3409         if (inode == NULL || !nfs_have_layout(inode))
3410                 return false;
3411
3412         return pnfs_wait_on_layoutreturn(inode, task);
3413 }
3414
3415 /*
3416  * Update the seqid of an open stateid
3417  */
3418 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3419                 struct nfs4_state *state)
3420 {
3421         __be32 seqid_open;
3422         u32 dst_seqid;
3423         int seq;
3424
3425         for (;;) {
3426                 if (!nfs4_valid_open_stateid(state))
3427                         break;
3428                 seq = read_seqbegin(&state->seqlock);
3429                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3430                         nfs4_stateid_copy(dst, &state->open_stateid);
3431                         if (read_seqretry(&state->seqlock, seq))
3432                                 continue;
3433                         break;
3434                 }
3435                 seqid_open = state->open_stateid.seqid;
3436                 if (read_seqretry(&state->seqlock, seq))
3437                         continue;
3438
3439                 dst_seqid = be32_to_cpu(dst->seqid);
3440                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3441                         dst->seqid = seqid_open;
3442                 break;
3443         }
3444 }
3445
3446 /*
3447  * Update the seqid of an open stateid after receiving
3448  * NFS4ERR_OLD_STATEID
3449  */
3450 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3451                 struct nfs4_state *state)
3452 {
3453         __be32 seqid_open;
3454         u32 dst_seqid;
3455         bool ret;
3456         int seq, status = -EAGAIN;
3457         DEFINE_WAIT(wait);
3458
3459         for (;;) {
3460                 ret = false;
3461                 if (!nfs4_valid_open_stateid(state))
3462                         break;
3463                 seq = read_seqbegin(&state->seqlock);
3464                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3465                         if (read_seqretry(&state->seqlock, seq))
3466                                 continue;
3467                         break;
3468                 }
3469
3470                 write_seqlock(&state->seqlock);
3471                 seqid_open = state->open_stateid.seqid;
3472
3473                 dst_seqid = be32_to_cpu(dst->seqid);
3474
3475                 /* Did another OPEN bump the state's seqid?  try again: */
3476                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3477                         dst->seqid = seqid_open;
3478                         write_sequnlock(&state->seqlock);
3479                         ret = true;
3480                         break;
3481                 }
3482
3483                 /* server says we're behind but we haven't seen the update yet */
3484                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3485                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3486                 write_sequnlock(&state->seqlock);
3487                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3488
3489                 if (fatal_signal_pending(current))
3490                         status = -EINTR;
3491                 else
3492                         if (schedule_timeout(5*HZ) != 0)
3493                                 status = 0;
3494
3495                 finish_wait(&state->waitq, &wait);
3496
3497                 if (!status)
3498                         continue;
3499                 if (status == -EINTR)
3500                         break;
3501
3502                 /* we slept the whole 5 seconds, we must have lost a seqid */
3503                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3504                 ret = true;
3505                 break;
3506         }
3507
3508         return ret;
3509 }
3510
3511 struct nfs4_closedata {
3512         struct inode *inode;
3513         struct nfs4_state *state;
3514         struct nfs_closeargs arg;
3515         struct nfs_closeres res;
3516         struct {
3517                 struct nfs4_layoutreturn_args arg;
3518                 struct nfs4_layoutreturn_res res;
3519                 struct nfs4_xdr_opaque_data ld_private;
3520                 u32 roc_barrier;
3521                 bool roc;
3522         } lr;
3523         struct nfs_fattr fattr;
3524         unsigned long timestamp;
3525 };
3526
3527 static void nfs4_free_closedata(void *data)
3528 {
3529         struct nfs4_closedata *calldata = data;
3530         struct nfs4_state_owner *sp = calldata->state->owner;
3531         struct super_block *sb = calldata->state->inode->i_sb;
3532
3533         if (calldata->lr.roc)
3534                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3535                                 calldata->res.lr_ret);
3536         nfs4_put_open_state(calldata->state);
3537         nfs_free_seqid(calldata->arg.seqid);
3538         nfs4_put_state_owner(sp);
3539         nfs_sb_deactive(sb);
3540         kfree(calldata);
3541 }
3542
3543 static void nfs4_close_done(struct rpc_task *task, void *data)
3544 {
3545         struct nfs4_closedata *calldata = data;
3546         struct nfs4_state *state = calldata->state;
3547         struct nfs_server *server = NFS_SERVER(calldata->inode);
3548         nfs4_stateid *res_stateid = NULL;
3549         struct nfs4_exception exception = {
3550                 .state = state,
3551                 .inode = calldata->inode,
3552                 .stateid = &calldata->arg.stateid,
3553         };
3554
3555         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3556                 return;
3557         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3558
3559         /* Handle Layoutreturn errors */
3560         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3561                           &calldata->res.lr_ret) == -EAGAIN)
3562                 goto out_restart;
3563
3564         /* hmm. we are done with the inode, and in the process of freeing
3565          * the state_owner. we keep this around to process errors
3566          */
3567         switch (task->tk_status) {
3568                 case 0:
3569                         res_stateid = &calldata->res.stateid;
3570                         renew_lease(server, calldata->timestamp);
3571                         break;
3572                 case -NFS4ERR_ACCESS:
3573                         if (calldata->arg.bitmask != NULL) {
3574                                 calldata->arg.bitmask = NULL;
3575                                 calldata->res.fattr = NULL;
3576                                 goto out_restart;
3577
3578                         }
3579                         break;
3580                 case -NFS4ERR_OLD_STATEID:
3581                         /* Did we race with OPEN? */
3582                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3583                                                 state))
3584                                 goto out_restart;
3585                         goto out_release;
3586                 case -NFS4ERR_ADMIN_REVOKED:
3587                 case -NFS4ERR_STALE_STATEID:
3588                 case -NFS4ERR_EXPIRED:
3589                         nfs4_free_revoked_stateid(server,
3590                                         &calldata->arg.stateid,
3591                                         task->tk_msg.rpc_cred);
3592                         fallthrough;
3593                 case -NFS4ERR_BAD_STATEID:
3594                         if (calldata->arg.fmode == 0)
3595                                 break;
3596                         fallthrough;
3597                 default:
3598                         task->tk_status = nfs4_async_handle_exception(task,
3599                                         server, task->tk_status, &exception);
3600                         if (exception.retry)
3601                                 goto out_restart;
3602         }
3603         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3604                         res_stateid, calldata->arg.fmode);
3605 out_release:
3606         task->tk_status = 0;
3607         nfs_release_seqid(calldata->arg.seqid);
3608         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3609         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3610         return;
3611 out_restart:
3612         task->tk_status = 0;
3613         rpc_restart_call_prepare(task);
3614         goto out_release;
3615 }
3616
3617 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3618 {
3619         struct nfs4_closedata *calldata = data;
3620         struct nfs4_state *state = calldata->state;
3621         struct inode *inode = calldata->inode;
3622         struct nfs_server *server = NFS_SERVER(inode);
3623         struct pnfs_layout_hdr *lo;
3624         bool is_rdonly, is_wronly, is_rdwr;
3625         int call_close = 0;
3626
3627         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3628                 goto out_wait;
3629
3630         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3631         spin_lock(&state->owner->so_lock);
3632         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3633         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3634         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3635         /* Calculate the change in open mode */
3636         calldata->arg.fmode = 0;
3637         if (state->n_rdwr == 0) {
3638                 if (state->n_rdonly == 0)
3639                         call_close |= is_rdonly;
3640                 else if (is_rdonly)
3641                         calldata->arg.fmode |= FMODE_READ;
3642                 if (state->n_wronly == 0)
3643                         call_close |= is_wronly;
3644                 else if (is_wronly)
3645                         calldata->arg.fmode |= FMODE_WRITE;
3646                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3647                         call_close |= is_rdwr;
3648         } else if (is_rdwr)
3649                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3650
3651         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3652         if (!nfs4_valid_open_stateid(state))
3653                 call_close = 0;
3654         spin_unlock(&state->owner->so_lock);
3655
3656         if (!call_close) {
3657                 /* Note: exit _without_ calling nfs4_close_done */
3658                 goto out_no_action;
3659         }
3660
3661         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3662                 nfs_release_seqid(calldata->arg.seqid);
3663                 goto out_wait;
3664         }
3665
3666         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3667         if (lo && !pnfs_layout_is_valid(lo)) {
3668                 calldata->arg.lr_args = NULL;
3669                 calldata->res.lr_res = NULL;
3670         }
3671
3672         if (calldata->arg.fmode == 0)
3673                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3674
3675         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3676                 /* Close-to-open cache consistency revalidation */
3677                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3678                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3679                                          server->cache_consistency_bitmask,
3680                                          inode, 0);
3681                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3682                 } else
3683                         calldata->arg.bitmask = NULL;
3684         }
3685
3686         calldata->arg.share_access =
3687                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3688                                 calldata->arg.fmode, 0);
3689
3690         if (calldata->res.fattr == NULL)
3691                 calldata->arg.bitmask = NULL;
3692         else if (calldata->arg.bitmask == NULL)
3693                 calldata->res.fattr = NULL;
3694         calldata->timestamp = jiffies;
3695         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3696                                 &calldata->arg.seq_args,
3697                                 &calldata->res.seq_res,
3698                                 task) != 0)
3699                 nfs_release_seqid(calldata->arg.seqid);
3700         return;
3701 out_no_action:
3702         task->tk_action = NULL;
3703 out_wait:
3704         nfs4_sequence_done(task, &calldata->res.seq_res);
3705 }
3706
3707 static const struct rpc_call_ops nfs4_close_ops = {
3708         .rpc_call_prepare = nfs4_close_prepare,
3709         .rpc_call_done = nfs4_close_done,
3710         .rpc_release = nfs4_free_closedata,
3711 };
3712
3713 /*
3714  * It is possible for data to be read/written from a mem-mapped file
3715  * after the sys_close call (which hits the vfs layer as a flush).
3716  * This means that we can't safely call nfsv4 close on a file until
3717  * the inode is cleared. This in turn means that we are not good
3718  * NFSv4 citizens - we do not indicate to the server to update the file's
3719  * share state even when we are done with one of the three share
3720  * stateid's in the inode.
3721  *
3722  * NOTE: Caller must be holding the sp->so_owner semaphore!
3723  */
3724 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3725 {
3726         struct nfs_server *server = NFS_SERVER(state->inode);
3727         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3728         struct nfs4_closedata *calldata;
3729         struct nfs4_state_owner *sp = state->owner;
3730         struct rpc_task *task;
3731         struct rpc_message msg = {
3732                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3733                 .rpc_cred = state->owner->so_cred,
3734         };
3735         struct rpc_task_setup task_setup_data = {
3736                 .rpc_client = server->client,
3737                 .rpc_message = &msg,
3738                 .callback_ops = &nfs4_close_ops,
3739                 .workqueue = nfsiod_workqueue,
3740                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3741         };
3742         int status = -ENOMEM;
3743
3744         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3745                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3746
3747         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3748                 &task_setup_data.rpc_client, &msg);
3749
3750         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3751         if (calldata == NULL)
3752                 goto out;
3753         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3754         calldata->inode = state->inode;
3755         calldata->state = state;
3756         calldata->arg.fh = NFS_FH(state->inode);
3757         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3758                 goto out_free_calldata;
3759         /* Serialization for the sequence id */
3760         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3761         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3762         if (IS_ERR(calldata->arg.seqid))
3763                 goto out_free_calldata;
3764         nfs_fattr_init(&calldata->fattr);
3765         calldata->arg.fmode = 0;
3766         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3767         calldata->res.fattr = &calldata->fattr;
3768         calldata->res.seqid = calldata->arg.seqid;
3769         calldata->res.server = server;
3770         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3771         calldata->lr.roc = pnfs_roc(state->inode,
3772                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3773         if (calldata->lr.roc) {
3774                 calldata->arg.lr_args = &calldata->lr.arg;
3775                 calldata->res.lr_res = &calldata->lr.res;
3776         }
3777         nfs_sb_active(calldata->inode->i_sb);
3778
3779         msg.rpc_argp = &calldata->arg;
3780         msg.rpc_resp = &calldata->res;
3781         task_setup_data.callback_data = calldata;
3782         task = rpc_run_task(&task_setup_data);
3783         if (IS_ERR(task))
3784                 return PTR_ERR(task);
3785         status = 0;
3786         if (wait)
3787                 status = rpc_wait_for_completion_task(task);
3788         rpc_put_task(task);
3789         return status;
3790 out_free_calldata:
3791         kfree(calldata);
3792 out:
3793         nfs4_put_open_state(state);
3794         nfs4_put_state_owner(sp);
3795         return status;
3796 }
3797
3798 static struct inode *
3799 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3800                 int open_flags, struct iattr *attr, int *opened)
3801 {
3802         struct nfs4_state *state;
3803         struct nfs4_label l, *label;
3804
3805         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3806
3807         /* Protect against concurrent sillydeletes */
3808         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3809
3810         nfs4_label_release_security(label);
3811
3812         if (IS_ERR(state))
3813                 return ERR_CAST(state);
3814         return state->inode;
3815 }
3816
3817 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3818 {
3819         if (ctx->state == NULL)
3820                 return;
3821         if (is_sync)
3822                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3823         else
3824                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3825 }
3826
3827 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3828 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3829 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3830
3831 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3832 {
3833         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3834         struct nfs4_server_caps_arg args = {
3835                 .fhandle = fhandle,
3836                 .bitmask = bitmask,
3837         };
3838         struct nfs4_server_caps_res res = {};
3839         struct rpc_message msg = {
3840                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3841                 .rpc_argp = &args,
3842                 .rpc_resp = &res,
3843         };
3844         int status;
3845         int i;
3846
3847         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3848                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3849                      FATTR4_WORD0_LINK_SUPPORT |
3850                      FATTR4_WORD0_SYMLINK_SUPPORT |
3851                      FATTR4_WORD0_ACLSUPPORT |
3852                      FATTR4_WORD0_CASE_INSENSITIVE |
3853                      FATTR4_WORD0_CASE_PRESERVING;
3854         if (minorversion)
3855                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3856
3857         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3858         if (status == 0) {
3859                 /* Sanity check the server answers */
3860                 switch (minorversion) {
3861                 case 0:
3862                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3863                         res.attr_bitmask[2] = 0;
3864                         break;
3865                 case 1:
3866                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3867                         break;
3868                 case 2:
3869                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3870                 }
3871                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3872                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3873                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3874                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3875                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3876                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3877                         server->caps |= NFS_CAP_ACLS;
3878                 if (res.has_links != 0)
3879                         server->caps |= NFS_CAP_HARDLINKS;
3880                 if (res.has_symlinks != 0)
3881                         server->caps |= NFS_CAP_SYMLINKS;
3882                 if (res.case_insensitive)
3883                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3884                 if (res.case_preserving)
3885                         server->caps |= NFS_CAP_CASE_PRESERVING;
3886 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3887                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3888                         server->caps |= NFS_CAP_SECURITY_LABEL;
3889 #endif
3890                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3891                         server->caps |= NFS_CAP_FS_LOCATIONS;
3892                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3893                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3894                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3895                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3896                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3897                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3898                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3899                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3900                                 NFS_ATTR_FATTR_OWNER_NAME);
3901                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3902                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3903                                 NFS_ATTR_FATTR_GROUP_NAME);
3904                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3905                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3906                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3907                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3908                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3909                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3910                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3911                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3912                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3913                                 sizeof(server->attr_bitmask));
3914                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3915
3916                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3917                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3918                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3919                 server->cache_consistency_bitmask[2] = 0;
3920
3921                 /* Avoid a regression due to buggy server */
3922                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3923                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3924                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3925                         sizeof(server->exclcreat_bitmask));
3926
3927                 server->acl_bitmask = res.acl_bitmask;
3928                 server->fh_expire_type = res.fh_expire_type;
3929         }
3930
3931         return status;
3932 }
3933
3934 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3935 {
3936         struct nfs4_exception exception = {
3937                 .interruptible = true,
3938         };
3939         int err;
3940
3941         nfs4_server_set_init_caps(server);
3942         do {
3943                 err = nfs4_handle_exception(server,
3944                                 _nfs4_server_capabilities(server, fhandle),
3945                                 &exception);
3946         } while (exception.retry);
3947         return err;
3948 }
3949
3950 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3951                                           struct nfs_client *clp,
3952                                           struct nfs_server *server)
3953 {
3954         int i;
3955
3956         for (i = 0; i < location->nservers; i++) {
3957                 struct nfs4_string *srv_loc = &location->servers[i];
3958                 struct sockaddr_storage addr;
3959                 size_t addrlen;
3960                 struct xprt_create xprt_args = {
3961                         .ident = 0,
3962                         .net = clp->cl_net,
3963                 };
3964                 struct nfs4_add_xprt_data xprtdata = {
3965                         .clp = clp,
3966                 };
3967                 struct rpc_add_xprt_test rpcdata = {
3968                         .add_xprt_test = clp->cl_mvops->session_trunk,
3969                         .data = &xprtdata,
3970                 };
3971                 char *servername = NULL;
3972
3973                 if (!srv_loc->len)
3974                         continue;
3975
3976                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3977                                                 &addr, sizeof(addr),
3978                                                 clp->cl_net, server->port);
3979                 if (!addrlen)
3980                         return;
3981                 xprt_args.dstaddr = (struct sockaddr *)&addr;
3982                 xprt_args.addrlen = addrlen;
3983                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3984                 if (!servername)
3985                         return;
3986                 memcpy(servername, srv_loc->data, srv_loc->len);
3987                 servername[srv_loc->len] = '\0';
3988                 xprt_args.servername = servername;
3989
3990                 xprtdata.cred = nfs4_get_clid_cred(clp);
3991                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
3992                                   rpc_clnt_setup_test_and_add_xprt,
3993                                   &rpcdata);
3994                 if (xprtdata.cred)
3995                         put_cred(xprtdata.cred);
3996                 kfree(servername);
3997         }
3998 }
3999
4000 static int _nfs4_discover_trunking(struct nfs_server *server,
4001                                    struct nfs_fh *fhandle)
4002 {
4003         struct nfs4_fs_locations *locations = NULL;
4004         struct page *page;
4005         const struct cred *cred;
4006         struct nfs_client *clp = server->nfs_client;
4007         const struct nfs4_state_maintenance_ops *ops =
4008                 clp->cl_mvops->state_renewal_ops;
4009         int status = -ENOMEM, i;
4010
4011         cred = ops->get_state_renewal_cred(clp);
4012         if (cred == NULL) {
4013                 cred = nfs4_get_clid_cred(clp);
4014                 if (cred == NULL)
4015                         return -ENOKEY;
4016         }
4017
4018         page = alloc_page(GFP_KERNEL);
4019         if (!page)
4020                 goto out_put_cred;
4021         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4022         if (!locations)
4023                 goto out_free;
4024         locations->fattr = nfs_alloc_fattr();
4025         if (!locations->fattr)
4026                 goto out_free_2;
4027
4028         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4029                                          cred);
4030         if (status)
4031                 goto out_free_3;
4032
4033         for (i = 0; i < locations->nlocations; i++)
4034                 test_fs_location_for_trunking(&locations->locations[i], clp,
4035                                               server);
4036 out_free_3:
4037         kfree(locations->fattr);
4038 out_free_2:
4039         kfree(locations);
4040 out_free:
4041         __free_page(page);
4042 out_put_cred:
4043         put_cred(cred);
4044         return status;
4045 }
4046
4047 static int nfs4_discover_trunking(struct nfs_server *server,
4048                                   struct nfs_fh *fhandle)
4049 {
4050         struct nfs4_exception exception = {
4051                 .interruptible = true,
4052         };
4053         struct nfs_client *clp = server->nfs_client;
4054         int err = 0;
4055
4056         if (!nfs4_has_session(clp))
4057                 goto out;
4058         do {
4059                 err = nfs4_handle_exception(server,
4060                                 _nfs4_discover_trunking(server, fhandle),
4061                                 &exception);
4062         } while (exception.retry);
4063 out:
4064         return err;
4065 }
4066
4067 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4068                 struct nfs_fsinfo *info)
4069 {
4070         u32 bitmask[3];
4071         struct nfs4_lookup_root_arg args = {
4072                 .bitmask = bitmask,
4073         };
4074         struct nfs4_lookup_res res = {
4075                 .server = server,
4076                 .fattr = info->fattr,
4077                 .fh = fhandle,
4078         };
4079         struct rpc_message msg = {
4080                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4081                 .rpc_argp = &args,
4082                 .rpc_resp = &res,
4083         };
4084
4085         bitmask[0] = nfs4_fattr_bitmap[0];
4086         bitmask[1] = nfs4_fattr_bitmap[1];
4087         /*
4088          * Process the label in the upcoming getfattr
4089          */
4090         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4091
4092         nfs_fattr_init(info->fattr);
4093         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4094 }
4095
4096 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4097                 struct nfs_fsinfo *info)
4098 {
4099         struct nfs4_exception exception = {
4100                 .interruptible = true,
4101         };
4102         int err;
4103         do {
4104                 err = _nfs4_lookup_root(server, fhandle, info);
4105                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4106                 switch (err) {
4107                 case 0:
4108                 case -NFS4ERR_WRONGSEC:
4109                         goto out;
4110                 default:
4111                         err = nfs4_handle_exception(server, err, &exception);
4112                 }
4113         } while (exception.retry);
4114 out:
4115         return err;
4116 }
4117
4118 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4119                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4120 {
4121         struct rpc_auth_create_args auth_args = {
4122                 .pseudoflavor = flavor,
4123         };
4124         struct rpc_auth *auth;
4125
4126         auth = rpcauth_create(&auth_args, server->client);
4127         if (IS_ERR(auth))
4128                 return -EACCES;
4129         return nfs4_lookup_root(server, fhandle, info);
4130 }
4131
4132 /*
4133  * Retry pseudoroot lookup with various security flavors.  We do this when:
4134  *
4135  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4136  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4137  *
4138  * Returns zero on success, or a negative NFS4ERR value, or a
4139  * negative errno value.
4140  */
4141 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4142                               struct nfs_fsinfo *info)
4143 {
4144         /* Per 3530bis 15.33.5 */
4145         static const rpc_authflavor_t flav_array[] = {
4146                 RPC_AUTH_GSS_KRB5P,
4147                 RPC_AUTH_GSS_KRB5I,
4148                 RPC_AUTH_GSS_KRB5,
4149                 RPC_AUTH_UNIX,                  /* courtesy */
4150                 RPC_AUTH_NULL,
4151         };
4152         int status = -EPERM;
4153         size_t i;
4154
4155         if (server->auth_info.flavor_len > 0) {
4156                 /* try each flavor specified by user */
4157                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4158                         status = nfs4_lookup_root_sec(server, fhandle, info,
4159                                                 server->auth_info.flavors[i]);
4160                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4161                                 continue;
4162                         break;
4163                 }
4164         } else {
4165                 /* no flavors specified by user, try default list */
4166                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4167                         status = nfs4_lookup_root_sec(server, fhandle, info,
4168                                                       flav_array[i]);
4169                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4170                                 continue;
4171                         break;
4172                 }
4173         }
4174
4175         /*
4176          * -EACCES could mean that the user doesn't have correct permissions
4177          * to access the mount.  It could also mean that we tried to mount
4178          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4179          * existing mount programs don't handle -EACCES very well so it should
4180          * be mapped to -EPERM instead.
4181          */
4182         if (status == -EACCES)
4183                 status = -EPERM;
4184         return status;
4185 }
4186
4187 /**
4188  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4189  * @server: initialized nfs_server handle
4190  * @fhandle: we fill in the pseudo-fs root file handle
4191  * @info: we fill in an FSINFO struct
4192  * @auth_probe: probe the auth flavours
4193  *
4194  * Returns zero on success, or a negative errno.
4195  */
4196 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4197                          struct nfs_fsinfo *info,
4198                          bool auth_probe)
4199 {
4200         int status = 0;
4201
4202         if (!auth_probe)
4203                 status = nfs4_lookup_root(server, fhandle, info);
4204
4205         if (auth_probe || status == NFS4ERR_WRONGSEC)
4206                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4207                                 fhandle, info);
4208
4209         if (status == 0)
4210                 status = nfs4_server_capabilities(server, fhandle);
4211         if (status == 0)
4212                 status = nfs4_do_fsinfo(server, fhandle, info);
4213
4214         return nfs4_map_errors(status);
4215 }
4216
4217 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4218                               struct nfs_fsinfo *info)
4219 {
4220         int error;
4221         struct nfs_fattr *fattr = info->fattr;
4222
4223         error = nfs4_server_capabilities(server, mntfh);
4224         if (error < 0) {
4225                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4226                 return error;
4227         }
4228
4229         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4230         if (error < 0) {
4231                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4232                 goto out;
4233         }
4234
4235         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4236             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4237                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4238
4239 out:
4240         return error;
4241 }
4242
4243 /*
4244  * Get locations and (maybe) other attributes of a referral.
4245  * Note that we'll actually follow the referral later when
4246  * we detect fsid mismatch in inode revalidation
4247  */
4248 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4249                              const struct qstr *name, struct nfs_fattr *fattr,
4250                              struct nfs_fh *fhandle)
4251 {
4252         int status = -ENOMEM;
4253         struct page *page = NULL;
4254         struct nfs4_fs_locations *locations = NULL;
4255
4256         page = alloc_page(GFP_KERNEL);
4257         if (page == NULL)
4258                 goto out;
4259         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4260         if (locations == NULL)
4261                 goto out;
4262
4263         locations->fattr = fattr;
4264
4265         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4266         if (status != 0)
4267                 goto out;
4268
4269         /*
4270          * If the fsid didn't change, this is a migration event, not a
4271          * referral.  Cause us to drop into the exception handler, which
4272          * will kick off migration recovery.
4273          */
4274         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4275                 dprintk("%s: server did not return a different fsid for"
4276                         " a referral at %s\n", __func__, name->name);
4277                 status = -NFS4ERR_MOVED;
4278                 goto out;
4279         }
4280         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4281         nfs_fixup_referral_attributes(fattr);
4282         memset(fhandle, 0, sizeof(struct nfs_fh));
4283 out:
4284         if (page)
4285                 __free_page(page);
4286         kfree(locations);
4287         return status;
4288 }
4289
4290 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4291                                 struct nfs_fattr *fattr, struct inode *inode)
4292 {
4293         __u32 bitmask[NFS4_BITMASK_SZ];
4294         struct nfs4_getattr_arg args = {
4295                 .fh = fhandle,
4296                 .bitmask = bitmask,
4297         };
4298         struct nfs4_getattr_res res = {
4299                 .fattr = fattr,
4300                 .server = server,
4301         };
4302         struct rpc_message msg = {
4303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4304                 .rpc_argp = &args,
4305                 .rpc_resp = &res,
4306         };
4307         unsigned short task_flags = 0;
4308
4309         if (nfs4_has_session(server->nfs_client))
4310                 task_flags = RPC_TASK_MOVEABLE;
4311
4312         /* Is this is an attribute revalidation, subject to softreval? */
4313         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4314                 task_flags |= RPC_TASK_TIMEOUT;
4315
4316         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4317         nfs_fattr_init(fattr);
4318         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4319         return nfs4_do_call_sync(server->client, server, &msg,
4320                         &args.seq_args, &res.seq_res, task_flags);
4321 }
4322
4323 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4324                                 struct nfs_fattr *fattr, struct inode *inode)
4325 {
4326         struct nfs4_exception exception = {
4327                 .interruptible = true,
4328         };
4329         int err;
4330         do {
4331                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4332                 trace_nfs4_getattr(server, fhandle, fattr, err);
4333                 err = nfs4_handle_exception(server, err,
4334                                 &exception);
4335         } while (exception.retry);
4336         return err;
4337 }
4338
4339 /*
4340  * The file is not closed if it is opened due to the a request to change
4341  * the size of the file. The open call will not be needed once the
4342  * VFS layer lookup-intents are implemented.
4343  *
4344  * Close is called when the inode is destroyed.
4345  * If we haven't opened the file for O_WRONLY, we
4346  * need to in the size_change case to obtain a stateid.
4347  *
4348  * Got race?
4349  * Because OPEN is always done by name in nfsv4, it is
4350  * possible that we opened a different file by the same
4351  * name.  We can recognize this race condition, but we
4352  * can't do anything about it besides returning an error.
4353  *
4354  * This will be fixed with VFS changes (lookup-intent).
4355  */
4356 static int
4357 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4358                   struct iattr *sattr)
4359 {
4360         struct inode *inode = d_inode(dentry);
4361         const struct cred *cred = NULL;
4362         struct nfs_open_context *ctx = NULL;
4363         int status;
4364
4365         if (pnfs_ld_layoutret_on_setattr(inode) &&
4366             sattr->ia_valid & ATTR_SIZE &&
4367             sattr->ia_size < i_size_read(inode))
4368                 pnfs_commit_and_return_layout(inode);
4369
4370         nfs_fattr_init(fattr);
4371
4372         /* Deal with open(O_TRUNC) */
4373         if (sattr->ia_valid & ATTR_OPEN)
4374                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4375
4376         /* Optimization: if the end result is no change, don't RPC */
4377         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4378                 return 0;
4379
4380         /* Search for an existing open(O_WRITE) file */
4381         if (sattr->ia_valid & ATTR_FILE) {
4382
4383                 ctx = nfs_file_open_context(sattr->ia_file);
4384                 if (ctx)
4385                         cred = ctx->cred;
4386         }
4387
4388         /* Return any delegations if we're going to change ACLs */
4389         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4390                 nfs4_inode_make_writeable(inode);
4391
4392         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4393         if (status == 0) {
4394                 nfs_setattr_update_inode(inode, sattr, fattr);
4395                 nfs_setsecurity(inode, fattr);
4396         }
4397         return status;
4398 }
4399
4400 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4401                 struct dentry *dentry, struct nfs_fh *fhandle,
4402                 struct nfs_fattr *fattr)
4403 {
4404         struct nfs_server *server = NFS_SERVER(dir);
4405         int                    status;
4406         struct nfs4_lookup_arg args = {
4407                 .bitmask = server->attr_bitmask,
4408                 .dir_fh = NFS_FH(dir),
4409                 .name = &dentry->d_name,
4410         };
4411         struct nfs4_lookup_res res = {
4412                 .server = server,
4413                 .fattr = fattr,
4414                 .fh = fhandle,
4415         };
4416         struct rpc_message msg = {
4417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4418                 .rpc_argp = &args,
4419                 .rpc_resp = &res,
4420         };
4421         unsigned short task_flags = 0;
4422
4423         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4424                 task_flags = RPC_TASK_MOVEABLE;
4425
4426         /* Is this is an attribute revalidation, subject to softreval? */
4427         if (nfs_lookup_is_soft_revalidate(dentry))
4428                 task_flags |= RPC_TASK_TIMEOUT;
4429
4430         args.bitmask = nfs4_bitmask(server, fattr->label);
4431
4432         nfs_fattr_init(fattr);
4433
4434         dprintk("NFS call  lookup %pd2\n", dentry);
4435         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4436         status = nfs4_do_call_sync(clnt, server, &msg,
4437                         &args.seq_args, &res.seq_res, task_flags);
4438         dprintk("NFS reply lookup: %d\n", status);
4439         return status;
4440 }
4441
4442 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4443 {
4444         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4445                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4446         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4447         fattr->nlink = 2;
4448 }
4449
4450 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4451                                    struct dentry *dentry, struct nfs_fh *fhandle,
4452                                    struct nfs_fattr *fattr)
4453 {
4454         struct nfs4_exception exception = {
4455                 .interruptible = true,
4456         };
4457         struct rpc_clnt *client = *clnt;
4458         const struct qstr *name = &dentry->d_name;
4459         int err;
4460         do {
4461                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4462                 trace_nfs4_lookup(dir, name, err);
4463                 switch (err) {
4464                 case -NFS4ERR_BADNAME:
4465                         err = -ENOENT;
4466                         goto out;
4467                 case -NFS4ERR_MOVED:
4468                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4469                         if (err == -NFS4ERR_MOVED)
4470                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4471                         goto out;
4472                 case -NFS4ERR_WRONGSEC:
4473                         err = -EPERM;
4474                         if (client != *clnt)
4475                                 goto out;
4476                         client = nfs4_negotiate_security(client, dir, name);
4477                         if (IS_ERR(client))
4478                                 return PTR_ERR(client);
4479
4480                         exception.retry = 1;
4481                         break;
4482                 default:
4483                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4484                 }
4485         } while (exception.retry);
4486
4487 out:
4488         if (err == 0)
4489                 *clnt = client;
4490         else if (client != *clnt)
4491                 rpc_shutdown_client(client);
4492
4493         return err;
4494 }
4495
4496 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4497                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4498 {
4499         int status;
4500         struct rpc_clnt *client = NFS_CLIENT(dir);
4501
4502         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4503         if (client != NFS_CLIENT(dir)) {
4504                 rpc_shutdown_client(client);
4505                 nfs_fixup_secinfo_attributes(fattr);
4506         }
4507         return status;
4508 }
4509
4510 struct rpc_clnt *
4511 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4512                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4513 {
4514         struct rpc_clnt *client = NFS_CLIENT(dir);
4515         int status;
4516
4517         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4518         if (status < 0)
4519                 return ERR_PTR(status);
4520         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4521 }
4522
4523 static int _nfs4_proc_lookupp(struct inode *inode,
4524                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4525 {
4526         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4527         struct nfs_server *server = NFS_SERVER(inode);
4528         int                    status;
4529         struct nfs4_lookupp_arg args = {
4530                 .bitmask = server->attr_bitmask,
4531                 .fh = NFS_FH(inode),
4532         };
4533         struct nfs4_lookupp_res res = {
4534                 .server = server,
4535                 .fattr = fattr,
4536                 .fh = fhandle,
4537         };
4538         struct rpc_message msg = {
4539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4540                 .rpc_argp = &args,
4541                 .rpc_resp = &res,
4542         };
4543         unsigned short task_flags = 0;
4544
4545         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4546                 task_flags |= RPC_TASK_TIMEOUT;
4547
4548         args.bitmask = nfs4_bitmask(server, fattr->label);
4549
4550         nfs_fattr_init(fattr);
4551
4552         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4553         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4554                                 &res.seq_res, task_flags);
4555         dprintk("NFS reply lookupp: %d\n", status);
4556         return status;
4557 }
4558
4559 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4560                              struct nfs_fattr *fattr)
4561 {
4562         struct nfs4_exception exception = {
4563                 .interruptible = true,
4564         };
4565         int err;
4566         do {
4567                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4568                 trace_nfs4_lookupp(inode, err);
4569                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4570                                 &exception);
4571         } while (exception.retry);
4572         return err;
4573 }
4574
4575 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4576                              const struct cred *cred)
4577 {
4578         struct nfs_server *server = NFS_SERVER(inode);
4579         struct nfs4_accessargs args = {
4580                 .fh = NFS_FH(inode),
4581                 .access = entry->mask,
4582         };
4583         struct nfs4_accessres res = {
4584                 .server = server,
4585         };
4586         struct rpc_message msg = {
4587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4588                 .rpc_argp = &args,
4589                 .rpc_resp = &res,
4590                 .rpc_cred = cred,
4591         };
4592         int status = 0;
4593
4594         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4595                 res.fattr = nfs_alloc_fattr();
4596                 if (res.fattr == NULL)
4597                         return -ENOMEM;
4598                 args.bitmask = server->cache_consistency_bitmask;
4599         }
4600         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4601         if (!status) {
4602                 nfs_access_set_mask(entry, res.access);
4603                 if (res.fattr)
4604                         nfs_refresh_inode(inode, res.fattr);
4605         }
4606         nfs_free_fattr(res.fattr);
4607         return status;
4608 }
4609
4610 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4611                             const struct cred *cred)
4612 {
4613         struct nfs4_exception exception = {
4614                 .interruptible = true,
4615         };
4616         int err;
4617         do {
4618                 err = _nfs4_proc_access(inode, entry, cred);
4619                 trace_nfs4_access(inode, err);
4620                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4621                                 &exception);
4622         } while (exception.retry);
4623         return err;
4624 }
4625
4626 /*
4627  * TODO: For the time being, we don't try to get any attributes
4628  * along with any of the zero-copy operations READ, READDIR,
4629  * READLINK, WRITE.
4630  *
4631  * In the case of the first three, we want to put the GETATTR
4632  * after the read-type operation -- this is because it is hard
4633  * to predict the length of a GETATTR response in v4, and thus
4634  * align the READ data correctly.  This means that the GETATTR
4635  * may end up partially falling into the page cache, and we should
4636  * shift it into the 'tail' of the xdr_buf before processing.
4637  * To do this efficiently, we need to know the total length
4638  * of data received, which doesn't seem to be available outside
4639  * of the RPC layer.
4640  *
4641  * In the case of WRITE, we also want to put the GETATTR after
4642  * the operation -- in this case because we want to make sure
4643  * we get the post-operation mtime and size.
4644  *
4645  * Both of these changes to the XDR layer would in fact be quite
4646  * minor, but I decided to leave them for a subsequent patch.
4647  */
4648 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4649                 unsigned int pgbase, unsigned int pglen)
4650 {
4651         struct nfs4_readlink args = {
4652                 .fh       = NFS_FH(inode),
4653                 .pgbase   = pgbase,
4654                 .pglen    = pglen,
4655                 .pages    = &page,
4656         };
4657         struct nfs4_readlink_res res;
4658         struct rpc_message msg = {
4659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4660                 .rpc_argp = &args,
4661                 .rpc_resp = &res,
4662         };
4663
4664         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4665 }
4666
4667 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4668                 unsigned int pgbase, unsigned int pglen)
4669 {
4670         struct nfs4_exception exception = {
4671                 .interruptible = true,
4672         };
4673         int err;
4674         do {
4675                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4676                 trace_nfs4_readlink(inode, err);
4677                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4678                                 &exception);
4679         } while (exception.retry);
4680         return err;
4681 }
4682
4683 /*
4684  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4685  */
4686 static int
4687 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4688                  int flags)
4689 {
4690         struct nfs_server *server = NFS_SERVER(dir);
4691         struct nfs4_label l, *ilabel;
4692         struct nfs_open_context *ctx;
4693         struct nfs4_state *state;
4694         int status = 0;
4695
4696         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4697         if (IS_ERR(ctx))
4698                 return PTR_ERR(ctx);
4699
4700         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4701
4702         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4703                 sattr->ia_mode &= ~current_umask();
4704         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4705         if (IS_ERR(state)) {
4706                 status = PTR_ERR(state);
4707                 goto out;
4708         }
4709 out:
4710         nfs4_label_release_security(ilabel);
4711         put_nfs_open_context(ctx);
4712         return status;
4713 }
4714
4715 static int
4716 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4717 {
4718         struct nfs_server *server = NFS_SERVER(dir);
4719         struct nfs_removeargs args = {
4720                 .fh = NFS_FH(dir),
4721                 .name = *name,
4722         };
4723         struct nfs_removeres res = {
4724                 .server = server,
4725         };
4726         struct rpc_message msg = {
4727                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4728                 .rpc_argp = &args,
4729                 .rpc_resp = &res,
4730         };
4731         unsigned long timestamp = jiffies;
4732         int status;
4733
4734         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4735         if (status == 0) {
4736                 spin_lock(&dir->i_lock);
4737                 /* Removing a directory decrements nlink in the parent */
4738                 if (ftype == NF4DIR && dir->i_nlink > 2)
4739                         nfs4_dec_nlink_locked(dir);
4740                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4741                                               NFS_INO_INVALID_DATA);
4742                 spin_unlock(&dir->i_lock);
4743         }
4744         return status;
4745 }
4746
4747 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4748 {
4749         struct nfs4_exception exception = {
4750                 .interruptible = true,
4751         };
4752         struct inode *inode = d_inode(dentry);
4753         int err;
4754
4755         if (inode) {
4756                 if (inode->i_nlink == 1)
4757                         nfs4_inode_return_delegation(inode);
4758                 else
4759                         nfs4_inode_make_writeable(inode);
4760         }
4761         do {
4762                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4763                 trace_nfs4_remove(dir, &dentry->d_name, err);
4764                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4765                                 &exception);
4766         } while (exception.retry);
4767         return err;
4768 }
4769
4770 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4771 {
4772         struct nfs4_exception exception = {
4773                 .interruptible = true,
4774         };
4775         int err;
4776
4777         do {
4778                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4779                 trace_nfs4_remove(dir, name, err);
4780                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4781                                 &exception);
4782         } while (exception.retry);
4783         return err;
4784 }
4785
4786 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4787                 struct dentry *dentry,
4788                 struct inode *inode)
4789 {
4790         struct nfs_removeargs *args = msg->rpc_argp;
4791         struct nfs_removeres *res = msg->rpc_resp;
4792
4793         res->server = NFS_SB(dentry->d_sb);
4794         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4795         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4796
4797         nfs_fattr_init(res->dir_attr);
4798
4799         if (inode) {
4800                 nfs4_inode_return_delegation(inode);
4801                 nfs_d_prune_case_insensitive_aliases(inode);
4802         }
4803 }
4804
4805 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4806 {
4807         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4808                         &data->args.seq_args,
4809                         &data->res.seq_res,
4810                         task);
4811 }
4812
4813 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4814 {
4815         struct nfs_unlinkdata *data = task->tk_calldata;
4816         struct nfs_removeres *res = &data->res;
4817
4818         if (!nfs4_sequence_done(task, &res->seq_res))
4819                 return 0;
4820         if (nfs4_async_handle_error(task, res->server, NULL,
4821                                     &data->timeout) == -EAGAIN)
4822                 return 0;
4823         if (task->tk_status == 0)
4824                 nfs4_update_changeattr(dir, &res->cinfo,
4825                                 res->dir_attr->time_start,
4826                                 NFS_INO_INVALID_DATA);
4827         return 1;
4828 }
4829
4830 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4831                 struct dentry *old_dentry,
4832                 struct dentry *new_dentry)
4833 {
4834         struct nfs_renameargs *arg = msg->rpc_argp;
4835         struct nfs_renameres *res = msg->rpc_resp;
4836         struct inode *old_inode = d_inode(old_dentry);
4837         struct inode *new_inode = d_inode(new_dentry);
4838
4839         if (old_inode)
4840                 nfs4_inode_make_writeable(old_inode);
4841         if (new_inode)
4842                 nfs4_inode_return_delegation(new_inode);
4843         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4844         res->server = NFS_SB(old_dentry->d_sb);
4845         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4846 }
4847
4848 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4849 {
4850         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4851                         &data->args.seq_args,
4852                         &data->res.seq_res,
4853                         task);
4854 }
4855
4856 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4857                                  struct inode *new_dir)
4858 {
4859         struct nfs_renamedata *data = task->tk_calldata;
4860         struct nfs_renameres *res = &data->res;
4861
4862         if (!nfs4_sequence_done(task, &res->seq_res))
4863                 return 0;
4864         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4865                 return 0;
4866
4867         if (task->tk_status == 0) {
4868                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4869                 if (new_dir != old_dir) {
4870                         /* Note: If we moved a directory, nlink will change */
4871                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4872                                         res->old_fattr->time_start,
4873                                         NFS_INO_INVALID_NLINK |
4874                                             NFS_INO_INVALID_DATA);
4875                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4876                                         res->new_fattr->time_start,
4877                                         NFS_INO_INVALID_NLINK |
4878                                             NFS_INO_INVALID_DATA);
4879                 } else
4880                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4881                                         res->old_fattr->time_start,
4882                                         NFS_INO_INVALID_DATA);
4883         }
4884         return 1;
4885 }
4886
4887 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4888 {
4889         struct nfs_server *server = NFS_SERVER(inode);
4890         __u32 bitmask[NFS4_BITMASK_SZ];
4891         struct nfs4_link_arg arg = {
4892                 .fh     = NFS_FH(inode),
4893                 .dir_fh = NFS_FH(dir),
4894                 .name   = name,
4895                 .bitmask = bitmask,
4896         };
4897         struct nfs4_link_res res = {
4898                 .server = server,
4899         };
4900         struct rpc_message msg = {
4901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4902                 .rpc_argp = &arg,
4903                 .rpc_resp = &res,
4904         };
4905         int status = -ENOMEM;
4906
4907         res.fattr = nfs_alloc_fattr_with_label(server);
4908         if (res.fattr == NULL)
4909                 goto out;
4910
4911         nfs4_inode_make_writeable(inode);
4912         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4913                                 NFS_INO_INVALID_CHANGE);
4914         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4915         if (!status) {
4916                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4917                                        NFS_INO_INVALID_DATA);
4918                 nfs4_inc_nlink(inode);
4919                 status = nfs_post_op_update_inode(inode, res.fattr);
4920                 if (!status)
4921                         nfs_setsecurity(inode, res.fattr);
4922         }
4923
4924 out:
4925         nfs_free_fattr(res.fattr);
4926         return status;
4927 }
4928
4929 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4930 {
4931         struct nfs4_exception exception = {
4932                 .interruptible = true,
4933         };
4934         int err;
4935         do {
4936                 err = nfs4_handle_exception(NFS_SERVER(inode),
4937                                 _nfs4_proc_link(inode, dir, name),
4938                                 &exception);
4939         } while (exception.retry);
4940         return err;
4941 }
4942
4943 struct nfs4_createdata {
4944         struct rpc_message msg;
4945         struct nfs4_create_arg arg;
4946         struct nfs4_create_res res;
4947         struct nfs_fh fh;
4948         struct nfs_fattr fattr;
4949 };
4950
4951 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4952                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4953 {
4954         struct nfs4_createdata *data;
4955
4956         data = kzalloc(sizeof(*data), GFP_KERNEL);
4957         if (data != NULL) {
4958                 struct nfs_server *server = NFS_SERVER(dir);
4959
4960                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4961                 if (IS_ERR(data->fattr.label))
4962                         goto out_free;
4963
4964                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4965                 data->msg.rpc_argp = &data->arg;
4966                 data->msg.rpc_resp = &data->res;
4967                 data->arg.dir_fh = NFS_FH(dir);
4968                 data->arg.server = server;
4969                 data->arg.name = name;
4970                 data->arg.attrs = sattr;
4971                 data->arg.ftype = ftype;
4972                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4973                 data->arg.umask = current_umask();
4974                 data->res.server = server;
4975                 data->res.fh = &data->fh;
4976                 data->res.fattr = &data->fattr;
4977                 nfs_fattr_init(data->res.fattr);
4978         }
4979         return data;
4980 out_free:
4981         kfree(data);
4982         return NULL;
4983 }
4984
4985 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4986 {
4987         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4988                                     &data->arg.seq_args, &data->res.seq_res, 1);
4989         if (status == 0) {
4990                 spin_lock(&dir->i_lock);
4991                 /* Creating a directory bumps nlink in the parent */
4992                 if (data->arg.ftype == NF4DIR)
4993                         nfs4_inc_nlink_locked(dir);
4994                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4995                                               data->res.fattr->time_start,
4996                                               NFS_INO_INVALID_DATA);
4997                 spin_unlock(&dir->i_lock);
4998                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
4999         }
5000         return status;
5001 }
5002
5003 static void nfs4_free_createdata(struct nfs4_createdata *data)
5004 {
5005         nfs4_label_free(data->fattr.label);
5006         kfree(data);
5007 }
5008
5009 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5010                 struct page *page, unsigned int len, struct iattr *sattr,
5011                 struct nfs4_label *label)
5012 {
5013         struct nfs4_createdata *data;
5014         int status = -ENAMETOOLONG;
5015
5016         if (len > NFS4_MAXPATHLEN)
5017                 goto out;
5018
5019         status = -ENOMEM;
5020         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5021         if (data == NULL)
5022                 goto out;
5023
5024         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5025         data->arg.u.symlink.pages = &page;
5026         data->arg.u.symlink.len = len;
5027         data->arg.label = label;
5028
5029         status = nfs4_do_create(dir, dentry, data);
5030
5031         nfs4_free_createdata(data);
5032 out:
5033         return status;
5034 }
5035
5036 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5037                 struct page *page, unsigned int len, struct iattr *sattr)
5038 {
5039         struct nfs4_exception exception = {
5040                 .interruptible = true,
5041         };
5042         struct nfs4_label l, *label;
5043         int err;
5044
5045         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5046
5047         do {
5048                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5049                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5050                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5051                                 &exception);
5052         } while (exception.retry);
5053
5054         nfs4_label_release_security(label);
5055         return err;
5056 }
5057
5058 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5059                 struct iattr *sattr, struct nfs4_label *label)
5060 {
5061         struct nfs4_createdata *data;
5062         int status = -ENOMEM;
5063
5064         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5065         if (data == NULL)
5066                 goto out;
5067
5068         data->arg.label = label;
5069         status = nfs4_do_create(dir, dentry, data);
5070
5071         nfs4_free_createdata(data);
5072 out:
5073         return status;
5074 }
5075
5076 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5077                 struct iattr *sattr)
5078 {
5079         struct nfs_server *server = NFS_SERVER(dir);
5080         struct nfs4_exception exception = {
5081                 .interruptible = true,
5082         };
5083         struct nfs4_label l, *label;
5084         int err;
5085
5086         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5087
5088         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5089                 sattr->ia_mode &= ~current_umask();
5090         do {
5091                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5092                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5093                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5094                                 &exception);
5095         } while (exception.retry);
5096         nfs4_label_release_security(label);
5097
5098         return err;
5099 }
5100
5101 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5102                               struct nfs_readdir_res *nr_res)
5103 {
5104         struct inode            *dir = d_inode(nr_arg->dentry);
5105         struct nfs_server       *server = NFS_SERVER(dir);
5106         struct nfs4_readdir_arg args = {
5107                 .fh = NFS_FH(dir),
5108                 .pages = nr_arg->pages,
5109                 .pgbase = 0,
5110                 .count = nr_arg->page_len,
5111                 .plus = nr_arg->plus,
5112         };
5113         struct nfs4_readdir_res res;
5114         struct rpc_message msg = {
5115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5116                 .rpc_argp = &args,
5117                 .rpc_resp = &res,
5118                 .rpc_cred = nr_arg->cred,
5119         };
5120         int                     status;
5121
5122         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5123                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5124         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5125                 args.bitmask = server->attr_bitmask_nl;
5126         else
5127                 args.bitmask = server->attr_bitmask;
5128
5129         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5130         res.pgbase = args.pgbase;
5131         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5132                         &res.seq_res, 0);
5133         if (status >= 0) {
5134                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5135                 status += args.pgbase;
5136         }
5137
5138         nfs_invalidate_atime(dir);
5139
5140         dprintk("%s: returns %d\n", __func__, status);
5141         return status;
5142 }
5143
5144 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5145                              struct nfs_readdir_res *res)
5146 {
5147         struct nfs4_exception exception = {
5148                 .interruptible = true,
5149         };
5150         int err;
5151         do {
5152                 err = _nfs4_proc_readdir(arg, res);
5153                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5154                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5155                                             err, &exception);
5156         } while (exception.retry);
5157         return err;
5158 }
5159
5160 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5161                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5162 {
5163         struct nfs4_createdata *data;
5164         int mode = sattr->ia_mode;
5165         int status = -ENOMEM;
5166
5167         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5168         if (data == NULL)
5169                 goto out;
5170
5171         if (S_ISFIFO(mode))
5172                 data->arg.ftype = NF4FIFO;
5173         else if (S_ISBLK(mode)) {
5174                 data->arg.ftype = NF4BLK;
5175                 data->arg.u.device.specdata1 = MAJOR(rdev);
5176                 data->arg.u.device.specdata2 = MINOR(rdev);
5177         }
5178         else if (S_ISCHR(mode)) {
5179                 data->arg.ftype = NF4CHR;
5180                 data->arg.u.device.specdata1 = MAJOR(rdev);
5181                 data->arg.u.device.specdata2 = MINOR(rdev);
5182         } else if (!S_ISSOCK(mode)) {
5183                 status = -EINVAL;
5184                 goto out_free;
5185         }
5186
5187         data->arg.label = label;
5188         status = nfs4_do_create(dir, dentry, data);
5189 out_free:
5190         nfs4_free_createdata(data);
5191 out:
5192         return status;
5193 }
5194
5195 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5196                 struct iattr *sattr, dev_t rdev)
5197 {
5198         struct nfs_server *server = NFS_SERVER(dir);
5199         struct nfs4_exception exception = {
5200                 .interruptible = true,
5201         };
5202         struct nfs4_label l, *label;
5203         int err;
5204
5205         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5206
5207         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5208                 sattr->ia_mode &= ~current_umask();
5209         do {
5210                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5211                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5212                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5213                                 &exception);
5214         } while (exception.retry);
5215
5216         nfs4_label_release_security(label);
5217
5218         return err;
5219 }
5220
5221 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5222                  struct nfs_fsstat *fsstat)
5223 {
5224         struct nfs4_statfs_arg args = {
5225                 .fh = fhandle,
5226                 .bitmask = server->attr_bitmask,
5227         };
5228         struct nfs4_statfs_res res = {
5229                 .fsstat = fsstat,
5230         };
5231         struct rpc_message msg = {
5232                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5233                 .rpc_argp = &args,
5234                 .rpc_resp = &res,
5235         };
5236
5237         nfs_fattr_init(fsstat->fattr);
5238         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5239 }
5240
5241 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5242 {
5243         struct nfs4_exception exception = {
5244                 .interruptible = true,
5245         };
5246         int err;
5247         do {
5248                 err = nfs4_handle_exception(server,
5249                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5250                                 &exception);
5251         } while (exception.retry);
5252         return err;
5253 }
5254
5255 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5256                 struct nfs_fsinfo *fsinfo)
5257 {
5258         struct nfs4_fsinfo_arg args = {
5259                 .fh = fhandle,
5260                 .bitmask = server->attr_bitmask,
5261         };
5262         struct nfs4_fsinfo_res res = {
5263                 .fsinfo = fsinfo,
5264         };
5265         struct rpc_message msg = {
5266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5267                 .rpc_argp = &args,
5268                 .rpc_resp = &res,
5269         };
5270
5271         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5272 }
5273
5274 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5275 {
5276         struct nfs4_exception exception = {
5277                 .interruptible = true,
5278         };
5279         int err;
5280
5281         do {
5282                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5283                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5284                 if (err == 0) {
5285                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5286                         break;
5287                 }
5288                 err = nfs4_handle_exception(server, err, &exception);
5289         } while (exception.retry);
5290         return err;
5291 }
5292
5293 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5294 {
5295         int error;
5296
5297         nfs_fattr_init(fsinfo->fattr);
5298         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5299         if (error == 0) {
5300                 /* block layout checks this! */
5301                 server->pnfs_blksize = fsinfo->blksize;
5302                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5303         }
5304
5305         return error;
5306 }
5307
5308 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5309                 struct nfs_pathconf *pathconf)
5310 {
5311         struct nfs4_pathconf_arg args = {
5312                 .fh = fhandle,
5313                 .bitmask = server->attr_bitmask,
5314         };
5315         struct nfs4_pathconf_res res = {
5316                 .pathconf = pathconf,
5317         };
5318         struct rpc_message msg = {
5319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5320                 .rpc_argp = &args,
5321                 .rpc_resp = &res,
5322         };
5323
5324         /* None of the pathconf attributes are mandatory to implement */
5325         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5326                 memset(pathconf, 0, sizeof(*pathconf));
5327                 return 0;
5328         }
5329
5330         nfs_fattr_init(pathconf->fattr);
5331         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5332 }
5333
5334 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5335                 struct nfs_pathconf *pathconf)
5336 {
5337         struct nfs4_exception exception = {
5338                 .interruptible = true,
5339         };
5340         int err;
5341
5342         do {
5343                 err = nfs4_handle_exception(server,
5344                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5345                                 &exception);
5346         } while (exception.retry);
5347         return err;
5348 }
5349
5350 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5351                 const struct nfs_open_context *ctx,
5352                 const struct nfs_lock_context *l_ctx,
5353                 fmode_t fmode)
5354 {
5355         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5356 }
5357 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5358
5359 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5360                 const struct nfs_open_context *ctx,
5361                 const struct nfs_lock_context *l_ctx,
5362                 fmode_t fmode)
5363 {
5364         nfs4_stateid _current_stateid;
5365
5366         /* If the current stateid represents a lost lock, then exit */
5367         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5368                 return true;
5369         return nfs4_stateid_match(stateid, &_current_stateid);
5370 }
5371
5372 static bool nfs4_error_stateid_expired(int err)
5373 {
5374         switch (err) {
5375         case -NFS4ERR_DELEG_REVOKED:
5376         case -NFS4ERR_ADMIN_REVOKED:
5377         case -NFS4ERR_BAD_STATEID:
5378         case -NFS4ERR_STALE_STATEID:
5379         case -NFS4ERR_OLD_STATEID:
5380         case -NFS4ERR_OPENMODE:
5381         case -NFS4ERR_EXPIRED:
5382                 return true;
5383         }
5384         return false;
5385 }
5386
5387 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5388 {
5389         struct nfs_server *server = NFS_SERVER(hdr->inode);
5390
5391         trace_nfs4_read(hdr, task->tk_status);
5392         if (task->tk_status < 0) {
5393                 struct nfs4_exception exception = {
5394                         .inode = hdr->inode,
5395                         .state = hdr->args.context->state,
5396                         .stateid = &hdr->args.stateid,
5397                 };
5398                 task->tk_status = nfs4_async_handle_exception(task,
5399                                 server, task->tk_status, &exception);
5400                 if (exception.retry) {
5401                         rpc_restart_call_prepare(task);
5402                         return -EAGAIN;
5403                 }
5404         }
5405
5406         if (task->tk_status > 0)
5407                 renew_lease(server, hdr->timestamp);
5408         return 0;
5409 }
5410
5411 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5412                 struct nfs_pgio_args *args)
5413 {
5414
5415         if (!nfs4_error_stateid_expired(task->tk_status) ||
5416                 nfs4_stateid_is_current(&args->stateid,
5417                                 args->context,
5418                                 args->lock_context,
5419                                 FMODE_READ))
5420                 return false;
5421         rpc_restart_call_prepare(task);
5422         return true;
5423 }
5424
5425 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5426                                          struct nfs_pgio_header *hdr)
5427 {
5428         struct nfs_server *server = NFS_SERVER(hdr->inode);
5429         struct rpc_message *msg = &task->tk_msg;
5430
5431         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5432             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5433                 server->caps &= ~NFS_CAP_READ_PLUS;
5434                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5435                 rpc_restart_call_prepare(task);
5436                 return true;
5437         }
5438         return false;
5439 }
5440
5441 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5442 {
5443         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5444                 return -EAGAIN;
5445         if (nfs4_read_stateid_changed(task, &hdr->args))
5446                 return -EAGAIN;
5447         if (nfs4_read_plus_not_supported(task, hdr))
5448                 return -EAGAIN;
5449         if (task->tk_status > 0)
5450                 nfs_invalidate_atime(hdr->inode);
5451         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5452                                     nfs4_read_done_cb(task, hdr);
5453 }
5454
5455 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5456 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5457                                     struct rpc_message *msg)
5458 {
5459         /* Note: We don't use READ_PLUS with pNFS yet */
5460         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5461                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5462                 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5463         }
5464         return false;
5465 }
5466 #else
5467 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5468                                     struct rpc_message *msg)
5469 {
5470         return false;
5471 }
5472 #endif /* CONFIG_NFS_V4_2 */
5473
5474 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5475                                  struct rpc_message *msg)
5476 {
5477         hdr->timestamp   = jiffies;
5478         if (!hdr->pgio_done_cb)
5479                 hdr->pgio_done_cb = nfs4_read_done_cb;
5480         if (!nfs42_read_plus_support(hdr, msg))
5481                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5482         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5483 }
5484
5485 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5486                                       struct nfs_pgio_header *hdr)
5487 {
5488         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5489                         &hdr->args.seq_args,
5490                         &hdr->res.seq_res,
5491                         task))
5492                 return 0;
5493         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5494                                 hdr->args.lock_context,
5495                                 hdr->rw_mode) == -EIO)
5496                 return -EIO;
5497         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5498                 return -EIO;
5499         return 0;
5500 }
5501
5502 static int nfs4_write_done_cb(struct rpc_task *task,
5503                               struct nfs_pgio_header *hdr)
5504 {
5505         struct inode *inode = hdr->inode;
5506
5507         trace_nfs4_write(hdr, task->tk_status);
5508         if (task->tk_status < 0) {
5509                 struct nfs4_exception exception = {
5510                         .inode = hdr->inode,
5511                         .state = hdr->args.context->state,
5512                         .stateid = &hdr->args.stateid,
5513                 };
5514                 task->tk_status = nfs4_async_handle_exception(task,
5515                                 NFS_SERVER(inode), task->tk_status,
5516                                 &exception);
5517                 if (exception.retry) {
5518                         rpc_restart_call_prepare(task);
5519                         return -EAGAIN;
5520                 }
5521         }
5522         if (task->tk_status >= 0) {
5523                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5524                 nfs_writeback_update_inode(hdr);
5525         }
5526         return 0;
5527 }
5528
5529 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5530                 struct nfs_pgio_args *args)
5531 {
5532
5533         if (!nfs4_error_stateid_expired(task->tk_status) ||
5534                 nfs4_stateid_is_current(&args->stateid,
5535                                 args->context,
5536                                 args->lock_context,
5537                                 FMODE_WRITE))
5538                 return false;
5539         rpc_restart_call_prepare(task);
5540         return true;
5541 }
5542
5543 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5544 {
5545         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5546                 return -EAGAIN;
5547         if (nfs4_write_stateid_changed(task, &hdr->args))
5548                 return -EAGAIN;
5549         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5550                 nfs4_write_done_cb(task, hdr);
5551 }
5552
5553 static
5554 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5555 {
5556         /* Don't request attributes for pNFS or O_DIRECT writes */
5557         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5558                 return false;
5559         /* Otherwise, request attributes if and only if we don't hold
5560          * a delegation
5561          */
5562         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5563 }
5564
5565 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5566                       struct inode *inode, unsigned long cache_validity)
5567 {
5568         struct nfs_server *server = NFS_SERVER(inode);
5569         unsigned int i;
5570
5571         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5572         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5573
5574         if (cache_validity & NFS_INO_INVALID_CHANGE)
5575                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5576         if (cache_validity & NFS_INO_INVALID_ATIME)
5577                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5578         if (cache_validity & NFS_INO_INVALID_MODE)
5579                 bitmask[1] |= FATTR4_WORD1_MODE;
5580         if (cache_validity & NFS_INO_INVALID_OTHER)
5581                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5582         if (cache_validity & NFS_INO_INVALID_NLINK)
5583                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5584         if (cache_validity & NFS_INO_INVALID_CTIME)
5585                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5586         if (cache_validity & NFS_INO_INVALID_MTIME)
5587                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5588         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5589                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5590
5591         if (cache_validity & NFS_INO_INVALID_SIZE)
5592                 bitmask[0] |= FATTR4_WORD0_SIZE;
5593
5594         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5595                 bitmask[i] &= server->attr_bitmask[i];
5596 }
5597
5598 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5599                                   struct rpc_message *msg,
5600                                   struct rpc_clnt **clnt)
5601 {
5602         struct nfs_server *server = NFS_SERVER(hdr->inode);
5603
5604         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5605                 hdr->args.bitmask = NULL;
5606                 hdr->res.fattr = NULL;
5607         } else {
5608                 nfs4_bitmask_set(hdr->args.bitmask_store,
5609                                  server->cache_consistency_bitmask,
5610                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5611                 hdr->args.bitmask = hdr->args.bitmask_store;
5612         }
5613
5614         if (!hdr->pgio_done_cb)
5615                 hdr->pgio_done_cb = nfs4_write_done_cb;
5616         hdr->res.server = server;
5617         hdr->timestamp   = jiffies;
5618
5619         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5620         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5621         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5622 }
5623
5624 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5625 {
5626         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5627                         &data->args.seq_args,
5628                         &data->res.seq_res,
5629                         task);
5630 }
5631
5632 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5633 {
5634         struct inode *inode = data->inode;
5635
5636         trace_nfs4_commit(data, task->tk_status);
5637         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5638                                     NULL, NULL) == -EAGAIN) {
5639                 rpc_restart_call_prepare(task);
5640                 return -EAGAIN;
5641         }
5642         return 0;
5643 }
5644
5645 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5646 {
5647         if (!nfs4_sequence_done(task, &data->res.seq_res))
5648                 return -EAGAIN;
5649         return data->commit_done_cb(task, data);
5650 }
5651
5652 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5653                                    struct rpc_clnt **clnt)
5654 {
5655         struct nfs_server *server = NFS_SERVER(data->inode);
5656
5657         if (data->commit_done_cb == NULL)
5658                 data->commit_done_cb = nfs4_commit_done_cb;
5659         data->res.server = server;
5660         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5661         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5662         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5663 }
5664
5665 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5666                                 struct nfs_commitres *res)
5667 {
5668         struct inode *dst_inode = file_inode(dst);
5669         struct nfs_server *server = NFS_SERVER(dst_inode);
5670         struct rpc_message msg = {
5671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5672                 .rpc_argp = args,
5673                 .rpc_resp = res,
5674         };
5675
5676         args->fh = NFS_FH(dst_inode);
5677         return nfs4_call_sync(server->client, server, &msg,
5678                         &args->seq_args, &res->seq_res, 1);
5679 }
5680
5681 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5682 {
5683         struct nfs_commitargs args = {
5684                 .offset = offset,
5685                 .count = count,
5686         };
5687         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5688         struct nfs4_exception exception = { };
5689         int status;
5690
5691         do {
5692                 status = _nfs4_proc_commit(dst, &args, res);
5693                 status = nfs4_handle_exception(dst_server, status, &exception);
5694         } while (exception.retry);
5695
5696         return status;
5697 }
5698
5699 struct nfs4_renewdata {
5700         struct nfs_client       *client;
5701         unsigned long           timestamp;
5702 };
5703
5704 /*
5705  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5706  * standalone procedure for queueing an asynchronous RENEW.
5707  */
5708 static void nfs4_renew_release(void *calldata)
5709 {
5710         struct nfs4_renewdata *data = calldata;
5711         struct nfs_client *clp = data->client;
5712
5713         if (refcount_read(&clp->cl_count) > 1)
5714                 nfs4_schedule_state_renewal(clp);
5715         nfs_put_client(clp);
5716         kfree(data);
5717 }
5718
5719 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5720 {
5721         struct nfs4_renewdata *data = calldata;
5722         struct nfs_client *clp = data->client;
5723         unsigned long timestamp = data->timestamp;
5724
5725         trace_nfs4_renew_async(clp, task->tk_status);
5726         switch (task->tk_status) {
5727         case 0:
5728                 break;
5729         case -NFS4ERR_LEASE_MOVED:
5730                 nfs4_schedule_lease_moved_recovery(clp);
5731                 break;
5732         default:
5733                 /* Unless we're shutting down, schedule state recovery! */
5734                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5735                         return;
5736                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5737                         nfs4_schedule_lease_recovery(clp);
5738                         return;
5739                 }
5740                 nfs4_schedule_path_down_recovery(clp);
5741         }
5742         do_renew_lease(clp, timestamp);
5743 }
5744
5745 static const struct rpc_call_ops nfs4_renew_ops = {
5746         .rpc_call_done = nfs4_renew_done,
5747         .rpc_release = nfs4_renew_release,
5748 };
5749
5750 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5751 {
5752         struct rpc_message msg = {
5753                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5754                 .rpc_argp       = clp,
5755                 .rpc_cred       = cred,
5756         };
5757         struct nfs4_renewdata *data;
5758
5759         if (renew_flags == 0)
5760                 return 0;
5761         if (!refcount_inc_not_zero(&clp->cl_count))
5762                 return -EIO;
5763         data = kmalloc(sizeof(*data), GFP_NOFS);
5764         if (data == NULL) {
5765                 nfs_put_client(clp);
5766                 return -ENOMEM;
5767         }
5768         data->client = clp;
5769         data->timestamp = jiffies;
5770         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5771                         &nfs4_renew_ops, data);
5772 }
5773
5774 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5775 {
5776         struct rpc_message msg = {
5777                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5778                 .rpc_argp       = clp,
5779                 .rpc_cred       = cred,
5780         };
5781         unsigned long now = jiffies;
5782         int status;
5783
5784         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5785         if (status < 0)
5786                 return status;
5787         do_renew_lease(clp, now);
5788         return 0;
5789 }
5790
5791 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5792                                       enum nfs4_acl_type type)
5793 {
5794         switch (type) {
5795         default:
5796                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5797         case NFS4ACL_DACL:
5798                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5799         case NFS4ACL_SACL:
5800                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5801         }
5802 }
5803
5804 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5805  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5806  * the stack.
5807  */
5808 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5809
5810 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5811                 struct page **pages)
5812 {
5813         struct page *newpage, **spages;
5814         int rc = 0;
5815         size_t len;
5816         spages = pages;
5817
5818         do {
5819                 len = min_t(size_t, PAGE_SIZE, buflen);
5820                 newpage = alloc_page(GFP_KERNEL);
5821
5822                 if (newpage == NULL)
5823                         goto unwind;
5824                 memcpy(page_address(newpage), buf, len);
5825                 buf += len;
5826                 buflen -= len;
5827                 *pages++ = newpage;
5828                 rc++;
5829         } while (buflen != 0);
5830
5831         return rc;
5832
5833 unwind:
5834         for(; rc > 0; rc--)
5835                 __free_page(spages[rc-1]);
5836         return -ENOMEM;
5837 }
5838
5839 struct nfs4_cached_acl {
5840         enum nfs4_acl_type type;
5841         int cached;
5842         size_t len;
5843         char data[];
5844 };
5845
5846 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5847 {
5848         struct nfs_inode *nfsi = NFS_I(inode);
5849
5850         spin_lock(&inode->i_lock);
5851         kfree(nfsi->nfs4_acl);
5852         nfsi->nfs4_acl = acl;
5853         spin_unlock(&inode->i_lock);
5854 }
5855
5856 static void nfs4_zap_acl_attr(struct inode *inode)
5857 {
5858         nfs4_set_cached_acl(inode, NULL);
5859 }
5860
5861 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5862                                     size_t buflen, enum nfs4_acl_type type)
5863 {
5864         struct nfs_inode *nfsi = NFS_I(inode);
5865         struct nfs4_cached_acl *acl;
5866         int ret = -ENOENT;
5867
5868         spin_lock(&inode->i_lock);
5869         acl = nfsi->nfs4_acl;
5870         if (acl == NULL)
5871                 goto out;
5872         if (acl->type != type)
5873                 goto out;
5874         if (buf == NULL) /* user is just asking for length */
5875                 goto out_len;
5876         if (acl->cached == 0)
5877                 goto out;
5878         ret = -ERANGE; /* see getxattr(2) man page */
5879         if (acl->len > buflen)
5880                 goto out;
5881         memcpy(buf, acl->data, acl->len);
5882 out_len:
5883         ret = acl->len;
5884 out:
5885         spin_unlock(&inode->i_lock);
5886         return ret;
5887 }
5888
5889 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5890                                   size_t pgbase, size_t acl_len,
5891                                   enum nfs4_acl_type type)
5892 {
5893         struct nfs4_cached_acl *acl;
5894         size_t buflen = sizeof(*acl) + acl_len;
5895
5896         if (buflen <= PAGE_SIZE) {
5897                 acl = kmalloc(buflen, GFP_KERNEL);
5898                 if (acl == NULL)
5899                         goto out;
5900                 acl->cached = 1;
5901                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5902         } else {
5903                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5904                 if (acl == NULL)
5905                         goto out;
5906                 acl->cached = 0;
5907         }
5908         acl->type = type;
5909         acl->len = acl_len;
5910 out:
5911         nfs4_set_cached_acl(inode, acl);
5912 }
5913
5914 /*
5915  * The getxattr API returns the required buffer length when called with a
5916  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5917  * the required buf.  On a NULL buf, we send a page of data to the server
5918  * guessing that the ACL request can be serviced by a page. If so, we cache
5919  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5920  * the cache. If not so, we throw away the page, and cache the required
5921  * length. The next getxattr call will then produce another round trip to
5922  * the server, this time with the input buf of the required size.
5923  */
5924 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5925                                        size_t buflen, enum nfs4_acl_type type)
5926 {
5927         struct page **pages;
5928         struct nfs_getaclargs args = {
5929                 .fh = NFS_FH(inode),
5930                 .acl_type = type,
5931                 .acl_len = buflen,
5932         };
5933         struct nfs_getaclres res = {
5934                 .acl_type = type,
5935                 .acl_len = buflen,
5936         };
5937         struct rpc_message msg = {
5938                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5939                 .rpc_argp = &args,
5940                 .rpc_resp = &res,
5941         };
5942         unsigned int npages;
5943         int ret = -ENOMEM, i;
5944         struct nfs_server *server = NFS_SERVER(inode);
5945
5946         if (buflen == 0)
5947                 buflen = server->rsize;
5948
5949         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5950         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5951         if (!pages)
5952                 return -ENOMEM;
5953
5954         args.acl_pages = pages;
5955
5956         for (i = 0; i < npages; i++) {
5957                 pages[i] = alloc_page(GFP_KERNEL);
5958                 if (!pages[i])
5959                         goto out_free;
5960         }
5961
5962         /* for decoding across pages */
5963         res.acl_scratch = alloc_page(GFP_KERNEL);
5964         if (!res.acl_scratch)
5965                 goto out_free;
5966
5967         args.acl_len = npages * PAGE_SIZE;
5968
5969         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5970                 __func__, buf, buflen, npages, args.acl_len);
5971         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5972                              &msg, &args.seq_args, &res.seq_res, 0);
5973         if (ret)
5974                 goto out_free;
5975
5976         /* Handle the case where the passed-in buffer is too short */
5977         if (res.acl_flags & NFS4_ACL_TRUNC) {
5978                 /* Did the user only issue a request for the acl length? */
5979                 if (buf == NULL)
5980                         goto out_ok;
5981                 ret = -ERANGE;
5982                 goto out_free;
5983         }
5984         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
5985                               type);
5986         if (buf) {
5987                 if (res.acl_len > buflen) {
5988                         ret = -ERANGE;
5989                         goto out_free;
5990                 }
5991                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5992         }
5993 out_ok:
5994         ret = res.acl_len;
5995 out_free:
5996         while (--i >= 0)
5997                 __free_page(pages[i]);
5998         if (res.acl_scratch)
5999                 __free_page(res.acl_scratch);
6000         kfree(pages);
6001         return ret;
6002 }
6003
6004 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6005                                      size_t buflen, enum nfs4_acl_type type)
6006 {
6007         struct nfs4_exception exception = {
6008                 .interruptible = true,
6009         };
6010         ssize_t ret;
6011         do {
6012                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6013                 trace_nfs4_get_acl(inode, ret);
6014                 if (ret >= 0)
6015                         break;
6016                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6017         } while (exception.retry);
6018         return ret;
6019 }
6020
6021 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6022                                  enum nfs4_acl_type type)
6023 {
6024         struct nfs_server *server = NFS_SERVER(inode);
6025         int ret;
6026
6027         if (!nfs4_server_supports_acls(server, type))
6028                 return -EOPNOTSUPP;
6029         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6030         if (ret < 0)
6031                 return ret;
6032         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6033                 nfs_zap_acl_cache(inode);
6034         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6035         if (ret != -ENOENT)
6036                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6037                  * but no cached acl data, just the acl length */
6038                 return ret;
6039         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6040 }
6041
6042 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6043                                size_t buflen, enum nfs4_acl_type type)
6044 {
6045         struct nfs_server *server = NFS_SERVER(inode);
6046         struct page *pages[NFS4ACL_MAXPAGES];
6047         struct nfs_setaclargs arg = {
6048                 .fh = NFS_FH(inode),
6049                 .acl_type = type,
6050                 .acl_len = buflen,
6051                 .acl_pages = pages,
6052         };
6053         struct nfs_setaclres res;
6054         struct rpc_message msg = {
6055                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6056                 .rpc_argp       = &arg,
6057                 .rpc_resp       = &res,
6058         };
6059         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6060         int ret, i;
6061
6062         /* You can't remove system.nfs4_acl: */
6063         if (buflen == 0)
6064                 return -EINVAL;
6065         if (!nfs4_server_supports_acls(server, type))
6066                 return -EOPNOTSUPP;
6067         if (npages > ARRAY_SIZE(pages))
6068                 return -ERANGE;
6069         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6070         if (i < 0)
6071                 return i;
6072         nfs4_inode_make_writeable(inode);
6073         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6074
6075         /*
6076          * Free each page after tx, so the only ref left is
6077          * held by the network stack
6078          */
6079         for (; i > 0; i--)
6080                 put_page(pages[i-1]);
6081
6082         /*
6083          * Acl update can result in inode attribute update.
6084          * so mark the attribute cache invalid.
6085          */
6086         spin_lock(&inode->i_lock);
6087         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6088                                              NFS_INO_INVALID_CTIME |
6089                                              NFS_INO_REVAL_FORCED);
6090         spin_unlock(&inode->i_lock);
6091         nfs_access_zap_cache(inode);
6092         nfs_zap_acl_cache(inode);
6093         return ret;
6094 }
6095
6096 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6097                              size_t buflen, enum nfs4_acl_type type)
6098 {
6099         struct nfs4_exception exception = { };
6100         int err;
6101         do {
6102                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6103                 trace_nfs4_set_acl(inode, err);
6104                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6105                         /*
6106                          * no need to retry since the kernel
6107                          * isn't involved in encoding the ACEs.
6108                          */
6109                         err = -EINVAL;
6110                         break;
6111                 }
6112                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6113                                 &exception);
6114         } while (exception.retry);
6115         return err;
6116 }
6117
6118 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6119 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6120                                         size_t buflen)
6121 {
6122         struct nfs_server *server = NFS_SERVER(inode);
6123         struct nfs4_label label = {0, 0, buflen, buf};
6124
6125         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6126         struct nfs_fattr fattr = {
6127                 .label = &label,
6128         };
6129         struct nfs4_getattr_arg arg = {
6130                 .fh             = NFS_FH(inode),
6131                 .bitmask        = bitmask,
6132         };
6133         struct nfs4_getattr_res res = {
6134                 .fattr          = &fattr,
6135                 .server         = server,
6136         };
6137         struct rpc_message msg = {
6138                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6139                 .rpc_argp       = &arg,
6140                 .rpc_resp       = &res,
6141         };
6142         int ret;
6143
6144         nfs_fattr_init(&fattr);
6145
6146         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6147         if (ret)
6148                 return ret;
6149         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6150                 return -ENOENT;
6151         return label.len;
6152 }
6153
6154 static int nfs4_get_security_label(struct inode *inode, void *buf,
6155                                         size_t buflen)
6156 {
6157         struct nfs4_exception exception = {
6158                 .interruptible = true,
6159         };
6160         int err;
6161
6162         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6163                 return -EOPNOTSUPP;
6164
6165         do {
6166                 err = _nfs4_get_security_label(inode, buf, buflen);
6167                 trace_nfs4_get_security_label(inode, err);
6168                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6169                                 &exception);
6170         } while (exception.retry);
6171         return err;
6172 }
6173
6174 static int _nfs4_do_set_security_label(struct inode *inode,
6175                 struct nfs4_label *ilabel,
6176                 struct nfs_fattr *fattr)
6177 {
6178
6179         struct iattr sattr = {0};
6180         struct nfs_server *server = NFS_SERVER(inode);
6181         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6182         struct nfs_setattrargs arg = {
6183                 .fh             = NFS_FH(inode),
6184                 .iap            = &sattr,
6185                 .server         = server,
6186                 .bitmask        = bitmask,
6187                 .label          = ilabel,
6188         };
6189         struct nfs_setattrres res = {
6190                 .fattr          = fattr,
6191                 .server         = server,
6192         };
6193         struct rpc_message msg = {
6194                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6195                 .rpc_argp       = &arg,
6196                 .rpc_resp       = &res,
6197         };
6198         int status;
6199
6200         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6201
6202         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6203         if (status)
6204                 dprintk("%s failed: %d\n", __func__, status);
6205
6206         return status;
6207 }
6208
6209 static int nfs4_do_set_security_label(struct inode *inode,
6210                 struct nfs4_label *ilabel,
6211                 struct nfs_fattr *fattr)
6212 {
6213         struct nfs4_exception exception = { };
6214         int err;
6215
6216         do {
6217                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6218                 trace_nfs4_set_security_label(inode, err);
6219                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6220                                 &exception);
6221         } while (exception.retry);
6222         return err;
6223 }
6224
6225 static int
6226 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6227 {
6228         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6229         struct nfs_fattr *fattr;
6230         int status;
6231
6232         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6233                 return -EOPNOTSUPP;
6234
6235         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6236         if (fattr == NULL)
6237                 return -ENOMEM;
6238
6239         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6240         if (status == 0)
6241                 nfs_setsecurity(inode, fattr);
6242
6243         return status;
6244 }
6245 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6246
6247
6248 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6249                                     nfs4_verifier *bootverf)
6250 {
6251         __be32 verf[2];
6252
6253         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6254                 /* An impossible timestamp guarantees this value
6255                  * will never match a generated boot time. */
6256                 verf[0] = cpu_to_be32(U32_MAX);
6257                 verf[1] = cpu_to_be32(U32_MAX);
6258         } else {
6259                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6260                 u64 ns = ktime_to_ns(nn->boot_time);
6261
6262                 verf[0] = cpu_to_be32(ns >> 32);
6263                 verf[1] = cpu_to_be32(ns);
6264         }
6265         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6266 }
6267
6268 static size_t
6269 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6270 {
6271         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6272         struct nfs_netns_client *nn_clp = nn->nfs_client;
6273         const char *id;
6274
6275         buf[0] = '\0';
6276
6277         if (nn_clp) {
6278                 rcu_read_lock();
6279                 id = rcu_dereference(nn_clp->identifier);
6280                 if (id)
6281                         strscpy(buf, id, buflen);
6282                 rcu_read_unlock();
6283         }
6284
6285         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6286                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6287
6288         return strlen(buf);
6289 }
6290
6291 static int
6292 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6293 {
6294         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6295         size_t buflen;
6296         size_t len;
6297         char *str;
6298
6299         if (clp->cl_owner_id != NULL)
6300                 return 0;
6301
6302         rcu_read_lock();
6303         len = 14 +
6304                 strlen(clp->cl_rpcclient->cl_nodename) +
6305                 1 +
6306                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6307                 1;
6308         rcu_read_unlock();
6309
6310         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6311         if (buflen)
6312                 len += buflen + 1;
6313
6314         if (len > NFS4_OPAQUE_LIMIT + 1)
6315                 return -EINVAL;
6316
6317         /*
6318          * Since this string is allocated at mount time, and held until the
6319          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6320          * about a memory-reclaim deadlock.
6321          */
6322         str = kmalloc(len, GFP_KERNEL);
6323         if (!str)
6324                 return -ENOMEM;
6325
6326         rcu_read_lock();
6327         if (buflen)
6328                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6329                           clp->cl_rpcclient->cl_nodename, buf,
6330                           rpc_peeraddr2str(clp->cl_rpcclient,
6331                                            RPC_DISPLAY_ADDR));
6332         else
6333                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6334                           clp->cl_rpcclient->cl_nodename,
6335                           rpc_peeraddr2str(clp->cl_rpcclient,
6336                                            RPC_DISPLAY_ADDR));
6337         rcu_read_unlock();
6338
6339         clp->cl_owner_id = str;
6340         return 0;
6341 }
6342
6343 static int
6344 nfs4_init_uniform_client_string(struct nfs_client *clp)
6345 {
6346         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6347         size_t buflen;
6348         size_t len;
6349         char *str;
6350
6351         if (clp->cl_owner_id != NULL)
6352                 return 0;
6353
6354         len = 10 + 10 + 1 + 10 + 1 +
6355                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6356
6357         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6358         if (buflen)
6359                 len += buflen + 1;
6360
6361         if (len > NFS4_OPAQUE_LIMIT + 1)
6362                 return -EINVAL;
6363
6364         /*
6365          * Since this string is allocated at mount time, and held until the
6366          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6367          * about a memory-reclaim deadlock.
6368          */
6369         str = kmalloc(len, GFP_KERNEL);
6370         if (!str)
6371                 return -ENOMEM;
6372
6373         if (buflen)
6374                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6375                           clp->rpc_ops->version, clp->cl_minorversion,
6376                           buf, clp->cl_rpcclient->cl_nodename);
6377         else
6378                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6379                           clp->rpc_ops->version, clp->cl_minorversion,
6380                           clp->cl_rpcclient->cl_nodename);
6381         clp->cl_owner_id = str;
6382         return 0;
6383 }
6384
6385 /*
6386  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6387  * services.  Advertise one based on the address family of the
6388  * clientaddr.
6389  */
6390 static unsigned int
6391 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6392 {
6393         if (strchr(clp->cl_ipaddr, ':') != NULL)
6394                 return scnprintf(buf, len, "tcp6");
6395         else
6396                 return scnprintf(buf, len, "tcp");
6397 }
6398
6399 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6400 {
6401         struct nfs4_setclientid *sc = calldata;
6402
6403         if (task->tk_status == 0)
6404                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6405 }
6406
6407 static const struct rpc_call_ops nfs4_setclientid_ops = {
6408         .rpc_call_done = nfs4_setclientid_done,
6409 };
6410
6411 /**
6412  * nfs4_proc_setclientid - Negotiate client ID
6413  * @clp: state data structure
6414  * @program: RPC program for NFSv4 callback service
6415  * @port: IP port number for NFS4 callback service
6416  * @cred: credential to use for this call
6417  * @res: where to place the result
6418  *
6419  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6420  */
6421 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6422                 unsigned short port, const struct cred *cred,
6423                 struct nfs4_setclientid_res *res)
6424 {
6425         nfs4_verifier sc_verifier;
6426         struct nfs4_setclientid setclientid = {
6427                 .sc_verifier = &sc_verifier,
6428                 .sc_prog = program,
6429                 .sc_clnt = clp,
6430         };
6431         struct rpc_message msg = {
6432                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6433                 .rpc_argp = &setclientid,
6434                 .rpc_resp = res,
6435                 .rpc_cred = cred,
6436         };
6437         struct rpc_task_setup task_setup_data = {
6438                 .rpc_client = clp->cl_rpcclient,
6439                 .rpc_message = &msg,
6440                 .callback_ops = &nfs4_setclientid_ops,
6441                 .callback_data = &setclientid,
6442                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6443         };
6444         unsigned long now = jiffies;
6445         int status;
6446
6447         /* nfs_client_id4 */
6448         nfs4_init_boot_verifier(clp, &sc_verifier);
6449
6450         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6451                 status = nfs4_init_uniform_client_string(clp);
6452         else
6453                 status = nfs4_init_nonuniform_client_string(clp);
6454
6455         if (status)
6456                 goto out;
6457
6458         /* cb_client4 */
6459         setclientid.sc_netid_len =
6460                                 nfs4_init_callback_netid(clp,
6461                                                 setclientid.sc_netid,
6462                                                 sizeof(setclientid.sc_netid));
6463         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6464                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6465                                 clp->cl_ipaddr, port >> 8, port & 255);
6466
6467         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6468                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6469                 clp->cl_owner_id);
6470
6471         status = nfs4_call_sync_custom(&task_setup_data);
6472         if (setclientid.sc_cred) {
6473                 kfree(clp->cl_acceptor);
6474                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6475                 put_rpccred(setclientid.sc_cred);
6476         }
6477
6478         if (status == 0)
6479                 do_renew_lease(clp, now);
6480 out:
6481         trace_nfs4_setclientid(clp, status);
6482         dprintk("NFS reply setclientid: %d\n", status);
6483         return status;
6484 }
6485
6486 /**
6487  * nfs4_proc_setclientid_confirm - Confirm client ID
6488  * @clp: state data structure
6489  * @arg: result of a previous SETCLIENTID
6490  * @cred: credential to use for this call
6491  *
6492  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6493  */
6494 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6495                 struct nfs4_setclientid_res *arg,
6496                 const struct cred *cred)
6497 {
6498         struct rpc_message msg = {
6499                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6500                 .rpc_argp = arg,
6501                 .rpc_cred = cred,
6502         };
6503         int status;
6504
6505         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6506                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6507                 clp->cl_clientid);
6508         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6509                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6510         trace_nfs4_setclientid_confirm(clp, status);
6511         dprintk("NFS reply setclientid_confirm: %d\n", status);
6512         return status;
6513 }
6514
6515 struct nfs4_delegreturndata {
6516         struct nfs4_delegreturnargs args;
6517         struct nfs4_delegreturnres res;
6518         struct nfs_fh fh;
6519         nfs4_stateid stateid;
6520         unsigned long timestamp;
6521         struct {
6522                 struct nfs4_layoutreturn_args arg;
6523                 struct nfs4_layoutreturn_res res;
6524                 struct nfs4_xdr_opaque_data ld_private;
6525                 u32 roc_barrier;
6526                 bool roc;
6527         } lr;
6528         struct nfs_fattr fattr;
6529         int rpc_status;
6530         struct inode *inode;
6531 };
6532
6533 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6534 {
6535         struct nfs4_delegreturndata *data = calldata;
6536         struct nfs4_exception exception = {
6537                 .inode = data->inode,
6538                 .stateid = &data->stateid,
6539                 .task_is_privileged = data->args.seq_args.sa_privileged,
6540         };
6541
6542         if (!nfs4_sequence_done(task, &data->res.seq_res))
6543                 return;
6544
6545         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6546
6547         /* Handle Layoutreturn errors */
6548         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6549                           &data->res.lr_ret) == -EAGAIN)
6550                 goto out_restart;
6551
6552         switch (task->tk_status) {
6553         case 0:
6554                 renew_lease(data->res.server, data->timestamp);
6555                 break;
6556         case -NFS4ERR_ADMIN_REVOKED:
6557         case -NFS4ERR_DELEG_REVOKED:
6558         case -NFS4ERR_EXPIRED:
6559                 nfs4_free_revoked_stateid(data->res.server,
6560                                 data->args.stateid,
6561                                 task->tk_msg.rpc_cred);
6562                 fallthrough;
6563         case -NFS4ERR_BAD_STATEID:
6564         case -NFS4ERR_STALE_STATEID:
6565         case -ETIMEDOUT:
6566                 task->tk_status = 0;
6567                 break;
6568         case -NFS4ERR_OLD_STATEID:
6569                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6570                         nfs4_stateid_seqid_inc(&data->stateid);
6571                 if (data->args.bitmask) {
6572                         data->args.bitmask = NULL;
6573                         data->res.fattr = NULL;
6574                 }
6575                 goto out_restart;
6576         case -NFS4ERR_ACCESS:
6577                 if (data->args.bitmask) {
6578                         data->args.bitmask = NULL;
6579                         data->res.fattr = NULL;
6580                         goto out_restart;
6581                 }
6582                 fallthrough;
6583         default:
6584                 task->tk_status = nfs4_async_handle_exception(task,
6585                                 data->res.server, task->tk_status,
6586                                 &exception);
6587                 if (exception.retry)
6588                         goto out_restart;
6589         }
6590         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6591         data->rpc_status = task->tk_status;
6592         return;
6593 out_restart:
6594         task->tk_status = 0;
6595         rpc_restart_call_prepare(task);
6596 }
6597
6598 static void nfs4_delegreturn_release(void *calldata)
6599 {
6600         struct nfs4_delegreturndata *data = calldata;
6601         struct inode *inode = data->inode;
6602
6603         if (data->lr.roc)
6604                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6605                                  data->res.lr_ret);
6606         if (inode) {
6607                 nfs4_fattr_set_prechange(&data->fattr,
6608                                          inode_peek_iversion_raw(inode));
6609                 nfs_refresh_inode(inode, &data->fattr);
6610                 nfs_iput_and_deactive(inode);
6611         }
6612         kfree(calldata);
6613 }
6614
6615 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6616 {
6617         struct nfs4_delegreturndata *d_data;
6618         struct pnfs_layout_hdr *lo;
6619
6620         d_data = data;
6621
6622         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6623                 nfs4_sequence_done(task, &d_data->res.seq_res);
6624                 return;
6625         }
6626
6627         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6628         if (lo && !pnfs_layout_is_valid(lo)) {
6629                 d_data->args.lr_args = NULL;
6630                 d_data->res.lr_res = NULL;
6631         }
6632
6633         nfs4_setup_sequence(d_data->res.server->nfs_client,
6634                         &d_data->args.seq_args,
6635                         &d_data->res.seq_res,
6636                         task);
6637 }
6638
6639 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6640         .rpc_call_prepare = nfs4_delegreturn_prepare,
6641         .rpc_call_done = nfs4_delegreturn_done,
6642         .rpc_release = nfs4_delegreturn_release,
6643 };
6644
6645 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6646 {
6647         struct nfs4_delegreturndata *data;
6648         struct nfs_server *server = NFS_SERVER(inode);
6649         struct rpc_task *task;
6650         struct rpc_message msg = {
6651                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6652                 .rpc_cred = cred,
6653         };
6654         struct rpc_task_setup task_setup_data = {
6655                 .rpc_client = server->client,
6656                 .rpc_message = &msg,
6657                 .callback_ops = &nfs4_delegreturn_ops,
6658                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6659         };
6660         int status = 0;
6661
6662         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6663                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6664
6665         data = kzalloc(sizeof(*data), GFP_KERNEL);
6666         if (data == NULL)
6667                 return -ENOMEM;
6668
6669         nfs4_state_protect(server->nfs_client,
6670                         NFS_SP4_MACH_CRED_CLEANUP,
6671                         &task_setup_data.rpc_client, &msg);
6672
6673         data->args.fhandle = &data->fh;
6674         data->args.stateid = &data->stateid;
6675         nfs4_bitmask_set(data->args.bitmask_store,
6676                          server->cache_consistency_bitmask, inode, 0);
6677         data->args.bitmask = data->args.bitmask_store;
6678         nfs_copy_fh(&data->fh, NFS_FH(inode));
6679         nfs4_stateid_copy(&data->stateid, stateid);
6680         data->res.fattr = &data->fattr;
6681         data->res.server = server;
6682         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6683         data->lr.arg.ld_private = &data->lr.ld_private;
6684         nfs_fattr_init(data->res.fattr);
6685         data->timestamp = jiffies;
6686         data->rpc_status = 0;
6687         data->inode = nfs_igrab_and_active(inode);
6688         if (data->inode || issync) {
6689                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6690                                         cred);
6691                 if (data->lr.roc) {
6692                         data->args.lr_args = &data->lr.arg;
6693                         data->res.lr_res = &data->lr.res;
6694                 }
6695         }
6696
6697         if (!data->inode)
6698                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6699                                    1);
6700         else
6701                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6702                                    0);
6703         task_setup_data.callback_data = data;
6704         msg.rpc_argp = &data->args;
6705         msg.rpc_resp = &data->res;
6706         task = rpc_run_task(&task_setup_data);
6707         if (IS_ERR(task))
6708                 return PTR_ERR(task);
6709         if (!issync)
6710                 goto out;
6711         status = rpc_wait_for_completion_task(task);
6712         if (status != 0)
6713                 goto out;
6714         status = data->rpc_status;
6715 out:
6716         rpc_put_task(task);
6717         return status;
6718 }
6719
6720 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6721 {
6722         struct nfs_server *server = NFS_SERVER(inode);
6723         struct nfs4_exception exception = { };
6724         int err;
6725         do {
6726                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6727                 trace_nfs4_delegreturn(inode, stateid, err);
6728                 switch (err) {
6729                         case -NFS4ERR_STALE_STATEID:
6730                         case -NFS4ERR_EXPIRED:
6731                         case 0:
6732                                 return 0;
6733                 }
6734                 err = nfs4_handle_exception(server, err, &exception);
6735         } while (exception.retry);
6736         return err;
6737 }
6738
6739 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6740 {
6741         struct inode *inode = state->inode;
6742         struct nfs_server *server = NFS_SERVER(inode);
6743         struct nfs_client *clp = server->nfs_client;
6744         struct nfs_lockt_args arg = {
6745                 .fh = NFS_FH(inode),
6746                 .fl = request,
6747         };
6748         struct nfs_lockt_res res = {
6749                 .denied = request,
6750         };
6751         struct rpc_message msg = {
6752                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6753                 .rpc_argp       = &arg,
6754                 .rpc_resp       = &res,
6755                 .rpc_cred       = state->owner->so_cred,
6756         };
6757         struct nfs4_lock_state *lsp;
6758         int status;
6759
6760         arg.lock_owner.clientid = clp->cl_clientid;
6761         status = nfs4_set_lock_state(state, request);
6762         if (status != 0)
6763                 goto out;
6764         lsp = request->fl_u.nfs4_fl.owner;
6765         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6766         arg.lock_owner.s_dev = server->s_dev;
6767         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6768         switch (status) {
6769                 case 0:
6770                         request->fl_type = F_UNLCK;
6771                         break;
6772                 case -NFS4ERR_DENIED:
6773                         status = 0;
6774         }
6775         request->fl_ops->fl_release_private(request);
6776         request->fl_ops = NULL;
6777 out:
6778         return status;
6779 }
6780
6781 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6782 {
6783         struct nfs4_exception exception = {
6784                 .interruptible = true,
6785         };
6786         int err;
6787
6788         do {
6789                 err = _nfs4_proc_getlk(state, cmd, request);
6790                 trace_nfs4_get_lock(request, state, cmd, err);
6791                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6792                                 &exception);
6793         } while (exception.retry);
6794         return err;
6795 }
6796
6797 /*
6798  * Update the seqid of a lock stateid after receiving
6799  * NFS4ERR_OLD_STATEID
6800  */
6801 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6802                 struct nfs4_lock_state *lsp)
6803 {
6804         struct nfs4_state *state = lsp->ls_state;
6805         bool ret = false;
6806
6807         spin_lock(&state->state_lock);
6808         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6809                 goto out;
6810         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6811                 nfs4_stateid_seqid_inc(dst);
6812         else
6813                 dst->seqid = lsp->ls_stateid.seqid;
6814         ret = true;
6815 out:
6816         spin_unlock(&state->state_lock);
6817         return ret;
6818 }
6819
6820 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6821                 struct nfs4_lock_state *lsp)
6822 {
6823         struct nfs4_state *state = lsp->ls_state;
6824         bool ret;
6825
6826         spin_lock(&state->state_lock);
6827         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6828         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6829         spin_unlock(&state->state_lock);
6830         return ret;
6831 }
6832
6833 struct nfs4_unlockdata {
6834         struct nfs_locku_args arg;
6835         struct nfs_locku_res res;
6836         struct nfs4_lock_state *lsp;
6837         struct nfs_open_context *ctx;
6838         struct nfs_lock_context *l_ctx;
6839         struct file_lock fl;
6840         struct nfs_server *server;
6841         unsigned long timestamp;
6842 };
6843
6844 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6845                 struct nfs_open_context *ctx,
6846                 struct nfs4_lock_state *lsp,
6847                 struct nfs_seqid *seqid)
6848 {
6849         struct nfs4_unlockdata *p;
6850         struct nfs4_state *state = lsp->ls_state;
6851         struct inode *inode = state->inode;
6852
6853         p = kzalloc(sizeof(*p), GFP_KERNEL);
6854         if (p == NULL)
6855                 return NULL;
6856         p->arg.fh = NFS_FH(inode);
6857         p->arg.fl = &p->fl;
6858         p->arg.seqid = seqid;
6859         p->res.seqid = seqid;
6860         p->lsp = lsp;
6861         /* Ensure we don't close file until we're done freeing locks! */
6862         p->ctx = get_nfs_open_context(ctx);
6863         p->l_ctx = nfs_get_lock_context(ctx);
6864         locks_init_lock(&p->fl);
6865         locks_copy_lock(&p->fl, fl);
6866         p->server = NFS_SERVER(inode);
6867         spin_lock(&state->state_lock);
6868         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6869         spin_unlock(&state->state_lock);
6870         return p;
6871 }
6872
6873 static void nfs4_locku_release_calldata(void *data)
6874 {
6875         struct nfs4_unlockdata *calldata = data;
6876         nfs_free_seqid(calldata->arg.seqid);
6877         nfs4_put_lock_state(calldata->lsp);
6878         nfs_put_lock_context(calldata->l_ctx);
6879         put_nfs_open_context(calldata->ctx);
6880         kfree(calldata);
6881 }
6882
6883 static void nfs4_locku_done(struct rpc_task *task, void *data)
6884 {
6885         struct nfs4_unlockdata *calldata = data;
6886         struct nfs4_exception exception = {
6887                 .inode = calldata->lsp->ls_state->inode,
6888                 .stateid = &calldata->arg.stateid,
6889         };
6890
6891         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6892                 return;
6893         switch (task->tk_status) {
6894                 case 0:
6895                         renew_lease(calldata->server, calldata->timestamp);
6896                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6897                         if (nfs4_update_lock_stateid(calldata->lsp,
6898                                         &calldata->res.stateid))
6899                                 break;
6900                         fallthrough;
6901                 case -NFS4ERR_ADMIN_REVOKED:
6902                 case -NFS4ERR_EXPIRED:
6903                         nfs4_free_revoked_stateid(calldata->server,
6904                                         &calldata->arg.stateid,
6905                                         task->tk_msg.rpc_cred);
6906                         fallthrough;
6907                 case -NFS4ERR_BAD_STATEID:
6908                 case -NFS4ERR_STALE_STATEID:
6909                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6910                                                 calldata->lsp))
6911                                 rpc_restart_call_prepare(task);
6912                         break;
6913                 case -NFS4ERR_OLD_STATEID:
6914                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6915                                                 calldata->lsp))
6916                                 rpc_restart_call_prepare(task);
6917                         break;
6918                 default:
6919                         task->tk_status = nfs4_async_handle_exception(task,
6920                                         calldata->server, task->tk_status,
6921                                         &exception);
6922                         if (exception.retry)
6923                                 rpc_restart_call_prepare(task);
6924         }
6925         nfs_release_seqid(calldata->arg.seqid);
6926 }
6927
6928 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6929 {
6930         struct nfs4_unlockdata *calldata = data;
6931
6932         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6933                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6934                 return;
6935
6936         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6937                 goto out_wait;
6938         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6939                 /* Note: exit _without_ running nfs4_locku_done */
6940                 goto out_no_action;
6941         }
6942         calldata->timestamp = jiffies;
6943         if (nfs4_setup_sequence(calldata->server->nfs_client,
6944                                 &calldata->arg.seq_args,
6945                                 &calldata->res.seq_res,
6946                                 task) != 0)
6947                 nfs_release_seqid(calldata->arg.seqid);
6948         return;
6949 out_no_action:
6950         task->tk_action = NULL;
6951 out_wait:
6952         nfs4_sequence_done(task, &calldata->res.seq_res);
6953 }
6954
6955 static const struct rpc_call_ops nfs4_locku_ops = {
6956         .rpc_call_prepare = nfs4_locku_prepare,
6957         .rpc_call_done = nfs4_locku_done,
6958         .rpc_release = nfs4_locku_release_calldata,
6959 };
6960
6961 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6962                 struct nfs_open_context *ctx,
6963                 struct nfs4_lock_state *lsp,
6964                 struct nfs_seqid *seqid)
6965 {
6966         struct nfs4_unlockdata *data;
6967         struct rpc_message msg = {
6968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6969                 .rpc_cred = ctx->cred,
6970         };
6971         struct rpc_task_setup task_setup_data = {
6972                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6973                 .rpc_message = &msg,
6974                 .callback_ops = &nfs4_locku_ops,
6975                 .workqueue = nfsiod_workqueue,
6976                 .flags = RPC_TASK_ASYNC,
6977         };
6978
6979         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
6980                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6981
6982         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6983                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6984
6985         /* Ensure this is an unlock - when canceling a lock, the
6986          * canceled lock is passed in, and it won't be an unlock.
6987          */
6988         fl->fl_type = F_UNLCK;
6989         if (fl->fl_flags & FL_CLOSE)
6990                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6991
6992         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6993         if (data == NULL) {
6994                 nfs_free_seqid(seqid);
6995                 return ERR_PTR(-ENOMEM);
6996         }
6997
6998         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6999         msg.rpc_argp = &data->arg;
7000         msg.rpc_resp = &data->res;
7001         task_setup_data.callback_data = data;
7002         return rpc_run_task(&task_setup_data);
7003 }
7004
7005 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7006 {
7007         struct inode *inode = state->inode;
7008         struct nfs4_state_owner *sp = state->owner;
7009         struct nfs_inode *nfsi = NFS_I(inode);
7010         struct nfs_seqid *seqid;
7011         struct nfs4_lock_state *lsp;
7012         struct rpc_task *task;
7013         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7014         int status = 0;
7015         unsigned char fl_flags = request->fl_flags;
7016
7017         status = nfs4_set_lock_state(state, request);
7018         /* Unlock _before_ we do the RPC call */
7019         request->fl_flags |= FL_EXISTS;
7020         /* Exclude nfs_delegation_claim_locks() */
7021         mutex_lock(&sp->so_delegreturn_mutex);
7022         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7023         down_read(&nfsi->rwsem);
7024         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7025                 up_read(&nfsi->rwsem);
7026                 mutex_unlock(&sp->so_delegreturn_mutex);
7027                 goto out;
7028         }
7029         lsp = request->fl_u.nfs4_fl.owner;
7030         set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7031         up_read(&nfsi->rwsem);
7032         mutex_unlock(&sp->so_delegreturn_mutex);
7033         if (status != 0)
7034                 goto out;
7035         /* Is this a delegated lock? */
7036         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7037                 goto out;
7038         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7039         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7040         status = -ENOMEM;
7041         if (IS_ERR(seqid))
7042                 goto out;
7043         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7044         status = PTR_ERR(task);
7045         if (IS_ERR(task))
7046                 goto out;
7047         status = rpc_wait_for_completion_task(task);
7048         rpc_put_task(task);
7049 out:
7050         request->fl_flags = fl_flags;
7051         trace_nfs4_unlock(request, state, F_SETLK, status);
7052         return status;
7053 }
7054
7055 struct nfs4_lockdata {
7056         struct nfs_lock_args arg;
7057         struct nfs_lock_res res;
7058         struct nfs4_lock_state *lsp;
7059         struct nfs_open_context *ctx;
7060         struct file_lock fl;
7061         unsigned long timestamp;
7062         int rpc_status;
7063         int cancelled;
7064         struct nfs_server *server;
7065 };
7066
7067 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7068                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7069                 gfp_t gfp_mask)
7070 {
7071         struct nfs4_lockdata *p;
7072         struct inode *inode = lsp->ls_state->inode;
7073         struct nfs_server *server = NFS_SERVER(inode);
7074         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7075
7076         p = kzalloc(sizeof(*p), gfp_mask);
7077         if (p == NULL)
7078                 return NULL;
7079
7080         p->arg.fh = NFS_FH(inode);
7081         p->arg.fl = &p->fl;
7082         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7083         if (IS_ERR(p->arg.open_seqid))
7084                 goto out_free;
7085         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7086         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7087         if (IS_ERR(p->arg.lock_seqid))
7088                 goto out_free_seqid;
7089         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7090         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7091         p->arg.lock_owner.s_dev = server->s_dev;
7092         p->res.lock_seqid = p->arg.lock_seqid;
7093         p->lsp = lsp;
7094         p->server = server;
7095         p->ctx = get_nfs_open_context(ctx);
7096         locks_init_lock(&p->fl);
7097         locks_copy_lock(&p->fl, fl);
7098         return p;
7099 out_free_seqid:
7100         nfs_free_seqid(p->arg.open_seqid);
7101 out_free:
7102         kfree(p);
7103         return NULL;
7104 }
7105
7106 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7107 {
7108         struct nfs4_lockdata *data = calldata;
7109         struct nfs4_state *state = data->lsp->ls_state;
7110
7111         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7112                 goto out_wait;
7113         /* Do we need to do an open_to_lock_owner? */
7114         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7115                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7116                         goto out_release_lock_seqid;
7117                 }
7118                 nfs4_stateid_copy(&data->arg.open_stateid,
7119                                 &state->open_stateid);
7120                 data->arg.new_lock_owner = 1;
7121                 data->res.open_seqid = data->arg.open_seqid;
7122         } else {
7123                 data->arg.new_lock_owner = 0;
7124                 nfs4_stateid_copy(&data->arg.lock_stateid,
7125                                 &data->lsp->ls_stateid);
7126         }
7127         if (!nfs4_valid_open_stateid(state)) {
7128                 data->rpc_status = -EBADF;
7129                 task->tk_action = NULL;
7130                 goto out_release_open_seqid;
7131         }
7132         data->timestamp = jiffies;
7133         if (nfs4_setup_sequence(data->server->nfs_client,
7134                                 &data->arg.seq_args,
7135                                 &data->res.seq_res,
7136                                 task) == 0)
7137                 return;
7138 out_release_open_seqid:
7139         nfs_release_seqid(data->arg.open_seqid);
7140 out_release_lock_seqid:
7141         nfs_release_seqid(data->arg.lock_seqid);
7142 out_wait:
7143         nfs4_sequence_done(task, &data->res.seq_res);
7144         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7145 }
7146
7147 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7148 {
7149         struct nfs4_lockdata *data = calldata;
7150         struct nfs4_lock_state *lsp = data->lsp;
7151
7152         if (!nfs4_sequence_done(task, &data->res.seq_res))
7153                 return;
7154
7155         data->rpc_status = task->tk_status;
7156         switch (task->tk_status) {
7157         case 0:
7158                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7159                                 data->timestamp);
7160                 if (data->arg.new_lock && !data->cancelled) {
7161                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7162                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7163                                 goto out_restart;
7164                 }
7165                 if (data->arg.new_lock_owner != 0) {
7166                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7167                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7168                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7169                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7170                         goto out_restart;
7171                 break;
7172         case -NFS4ERR_OLD_STATEID:
7173                 if (data->arg.new_lock_owner != 0 &&
7174                         nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7175                                         lsp->ls_state))
7176                         goto out_restart;
7177                 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7178                         goto out_restart;
7179                 fallthrough;
7180         case -NFS4ERR_BAD_STATEID:
7181         case -NFS4ERR_STALE_STATEID:
7182         case -NFS4ERR_EXPIRED:
7183                 if (data->arg.new_lock_owner != 0) {
7184                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7185                                                 &lsp->ls_state->open_stateid))
7186                                 goto out_restart;
7187                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7188                                                 &lsp->ls_stateid))
7189                                 goto out_restart;
7190         }
7191 out_done:
7192         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7193         return;
7194 out_restart:
7195         if (!data->cancelled)
7196                 rpc_restart_call_prepare(task);
7197         goto out_done;
7198 }
7199
7200 static void nfs4_lock_release(void *calldata)
7201 {
7202         struct nfs4_lockdata *data = calldata;
7203
7204         nfs_free_seqid(data->arg.open_seqid);
7205         if (data->cancelled && data->rpc_status == 0) {
7206                 struct rpc_task *task;
7207                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7208                                 data->arg.lock_seqid);
7209                 if (!IS_ERR(task))
7210                         rpc_put_task_async(task);
7211                 dprintk("%s: cancelling lock!\n", __func__);
7212         } else
7213                 nfs_free_seqid(data->arg.lock_seqid);
7214         nfs4_put_lock_state(data->lsp);
7215         put_nfs_open_context(data->ctx);
7216         kfree(data);
7217 }
7218
7219 static const struct rpc_call_ops nfs4_lock_ops = {
7220         .rpc_call_prepare = nfs4_lock_prepare,
7221         .rpc_call_done = nfs4_lock_done,
7222         .rpc_release = nfs4_lock_release,
7223 };
7224
7225 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7226 {
7227         switch (error) {
7228         case -NFS4ERR_ADMIN_REVOKED:
7229         case -NFS4ERR_EXPIRED:
7230         case -NFS4ERR_BAD_STATEID:
7231                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7232                 if (new_lock_owner != 0 ||
7233                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7234                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7235                 break;
7236         case -NFS4ERR_STALE_STATEID:
7237                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7238                 nfs4_schedule_lease_recovery(server->nfs_client);
7239         }
7240 }
7241
7242 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7243 {
7244         struct nfs4_lockdata *data;
7245         struct rpc_task *task;
7246         struct rpc_message msg = {
7247                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7248                 .rpc_cred = state->owner->so_cred,
7249         };
7250         struct rpc_task_setup task_setup_data = {
7251                 .rpc_client = NFS_CLIENT(state->inode),
7252                 .rpc_message = &msg,
7253                 .callback_ops = &nfs4_lock_ops,
7254                 .workqueue = nfsiod_workqueue,
7255                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7256         };
7257         int ret;
7258
7259         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7260                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7261
7262         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7263                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7264         if (data == NULL)
7265                 return -ENOMEM;
7266         if (IS_SETLKW(cmd))
7267                 data->arg.block = 1;
7268         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7269                                 recovery_type > NFS_LOCK_NEW);
7270         msg.rpc_argp = &data->arg;
7271         msg.rpc_resp = &data->res;
7272         task_setup_data.callback_data = data;
7273         if (recovery_type > NFS_LOCK_NEW) {
7274                 if (recovery_type == NFS_LOCK_RECLAIM)
7275                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7276         } else
7277                 data->arg.new_lock = 1;
7278         task = rpc_run_task(&task_setup_data);
7279         if (IS_ERR(task))
7280                 return PTR_ERR(task);
7281         ret = rpc_wait_for_completion_task(task);
7282         if (ret == 0) {
7283                 ret = data->rpc_status;
7284                 if (ret)
7285                         nfs4_handle_setlk_error(data->server, data->lsp,
7286                                         data->arg.new_lock_owner, ret);
7287         } else
7288                 data->cancelled = true;
7289         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7290         rpc_put_task(task);
7291         dprintk("%s: ret = %d\n", __func__, ret);
7292         return ret;
7293 }
7294
7295 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7296 {
7297         struct nfs_server *server = NFS_SERVER(state->inode);
7298         struct nfs4_exception exception = {
7299                 .inode = state->inode,
7300         };
7301         int err;
7302
7303         do {
7304                 /* Cache the lock if possible... */
7305                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7306                         return 0;
7307                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7308                 if (err != -NFS4ERR_DELAY)
7309                         break;
7310                 nfs4_handle_exception(server, err, &exception);
7311         } while (exception.retry);
7312         return err;
7313 }
7314
7315 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7316 {
7317         struct nfs_server *server = NFS_SERVER(state->inode);
7318         struct nfs4_exception exception = {
7319                 .inode = state->inode,
7320         };
7321         int err;
7322
7323         err = nfs4_set_lock_state(state, request);
7324         if (err != 0)
7325                 return err;
7326         if (!recover_lost_locks) {
7327                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7328                 return 0;
7329         }
7330         do {
7331                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7332                         return 0;
7333                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7334                 switch (err) {
7335                 default:
7336                         goto out;
7337                 case -NFS4ERR_GRACE:
7338                 case -NFS4ERR_DELAY:
7339                         nfs4_handle_exception(server, err, &exception);
7340                         err = 0;
7341                 }
7342         } while (exception.retry);
7343 out:
7344         return err;
7345 }
7346
7347 #if defined(CONFIG_NFS_V4_1)
7348 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7349 {
7350         struct nfs4_lock_state *lsp;
7351         int status;
7352
7353         status = nfs4_set_lock_state(state, request);
7354         if (status != 0)
7355                 return status;
7356         lsp = request->fl_u.nfs4_fl.owner;
7357         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7358             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7359                 return 0;
7360         return nfs4_lock_expired(state, request);
7361 }
7362 #endif
7363
7364 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7365 {
7366         struct nfs_inode *nfsi = NFS_I(state->inode);
7367         struct nfs4_state_owner *sp = state->owner;
7368         unsigned char fl_flags = request->fl_flags;
7369         int status;
7370
7371         request->fl_flags |= FL_ACCESS;
7372         status = locks_lock_inode_wait(state->inode, request);
7373         if (status < 0)
7374                 goto out;
7375         mutex_lock(&sp->so_delegreturn_mutex);
7376         down_read(&nfsi->rwsem);
7377         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7378                 /* Yes: cache locks! */
7379                 /* ...but avoid races with delegation recall... */
7380                 request->fl_flags = fl_flags & ~FL_SLEEP;
7381                 status = locks_lock_inode_wait(state->inode, request);
7382                 up_read(&nfsi->rwsem);
7383                 mutex_unlock(&sp->so_delegreturn_mutex);
7384                 goto out;
7385         }
7386         up_read(&nfsi->rwsem);
7387         mutex_unlock(&sp->so_delegreturn_mutex);
7388         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7389 out:
7390         request->fl_flags = fl_flags;
7391         return status;
7392 }
7393
7394 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7395 {
7396         struct nfs4_exception exception = {
7397                 .state = state,
7398                 .inode = state->inode,
7399                 .interruptible = true,
7400         };
7401         int err;
7402
7403         do {
7404                 err = _nfs4_proc_setlk(state, cmd, request);
7405                 if (err == -NFS4ERR_DENIED)
7406                         err = -EAGAIN;
7407                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7408                                 err, &exception);
7409         } while (exception.retry);
7410         return err;
7411 }
7412
7413 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7414 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7415
7416 static int
7417 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7418                         struct file_lock *request)
7419 {
7420         int             status = -ERESTARTSYS;
7421         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7422
7423         while(!signalled()) {
7424                 status = nfs4_proc_setlk(state, cmd, request);
7425                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7426                         break;
7427                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7428                 schedule_timeout(timeout);
7429                 timeout *= 2;
7430                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7431                 status = -ERESTARTSYS;
7432         }
7433         return status;
7434 }
7435
7436 #ifdef CONFIG_NFS_V4_1
7437 struct nfs4_lock_waiter {
7438         struct inode            *inode;
7439         struct nfs_lowner       owner;
7440         wait_queue_entry_t      wait;
7441 };
7442
7443 static int
7444 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7445 {
7446         struct nfs4_lock_waiter *waiter =
7447                 container_of(wait, struct nfs4_lock_waiter, wait);
7448
7449         /* NULL key means to wake up everyone */
7450         if (key) {
7451                 struct cb_notify_lock_args      *cbnl = key;
7452                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7453                                                 *wowner = &waiter->owner;
7454
7455                 /* Only wake if the callback was for the same owner. */
7456                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7457                         return 0;
7458
7459                 /* Make sure it's for the right inode */
7460                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7461                         return 0;
7462         }
7463
7464         return woken_wake_function(wait, mode, flags, key);
7465 }
7466
7467 static int
7468 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7469 {
7470         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7471         struct nfs_server *server = NFS_SERVER(state->inode);
7472         struct nfs_client *clp = server->nfs_client;
7473         wait_queue_head_t *q = &clp->cl_lock_waitq;
7474         struct nfs4_lock_waiter waiter = {
7475                 .inode = state->inode,
7476                 .owner = { .clientid = clp->cl_clientid,
7477                            .id = lsp->ls_seqid.owner_id,
7478                            .s_dev = server->s_dev },
7479         };
7480         int status;
7481
7482         /* Don't bother with waitqueue if we don't expect a callback */
7483         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7484                 return nfs4_retry_setlk_simple(state, cmd, request);
7485
7486         init_wait(&waiter.wait);
7487         waiter.wait.func = nfs4_wake_lock_waiter;
7488         add_wait_queue(q, &waiter.wait);
7489
7490         do {
7491                 status = nfs4_proc_setlk(state, cmd, request);
7492                 if (status != -EAGAIN || IS_SETLK(cmd))
7493                         break;
7494
7495                 status = -ERESTARTSYS;
7496                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7497                            NFS4_LOCK_MAXTIMEOUT);
7498         } while (!signalled());
7499
7500         remove_wait_queue(q, &waiter.wait);
7501
7502         return status;
7503 }
7504 #else /* !CONFIG_NFS_V4_1 */
7505 static inline int
7506 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7507 {
7508         return nfs4_retry_setlk_simple(state, cmd, request);
7509 }
7510 #endif
7511
7512 static int
7513 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7514 {
7515         struct nfs_open_context *ctx;
7516         struct nfs4_state *state;
7517         int status;
7518
7519         /* verify open state */
7520         ctx = nfs_file_open_context(filp);
7521         state = ctx->state;
7522
7523         if (IS_GETLK(cmd)) {
7524                 if (state != NULL)
7525                         return nfs4_proc_getlk(state, F_GETLK, request);
7526                 return 0;
7527         }
7528
7529         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7530                 return -EINVAL;
7531
7532         if (request->fl_type == F_UNLCK) {
7533                 if (state != NULL)
7534                         return nfs4_proc_unlck(state, cmd, request);
7535                 return 0;
7536         }
7537
7538         if (state == NULL)
7539                 return -ENOLCK;
7540
7541         if ((request->fl_flags & FL_POSIX) &&
7542             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7543                 return -ENOLCK;
7544
7545         /*
7546          * Don't rely on the VFS having checked the file open mode,
7547          * since it won't do this for flock() locks.
7548          */
7549         switch (request->fl_type) {
7550         case F_RDLCK:
7551                 if (!(filp->f_mode & FMODE_READ))
7552                         return -EBADF;
7553                 break;
7554         case F_WRLCK:
7555                 if (!(filp->f_mode & FMODE_WRITE))
7556                         return -EBADF;
7557         }
7558
7559         status = nfs4_set_lock_state(state, request);
7560         if (status != 0)
7561                 return status;
7562
7563         return nfs4_retry_setlk(state, cmd, request);
7564 }
7565
7566 static int nfs4_delete_lease(struct file *file, void **priv)
7567 {
7568         return generic_setlease(file, F_UNLCK, NULL, priv);
7569 }
7570
7571 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease,
7572                           void **priv)
7573 {
7574         struct inode *inode = file_inode(file);
7575         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7576         int ret;
7577
7578         /* No delegation, no lease */
7579         if (!nfs4_have_delegation(inode, type))
7580                 return -EAGAIN;
7581         ret = generic_setlease(file, arg, lease, priv);
7582         if (ret || nfs4_have_delegation(inode, type))
7583                 return ret;
7584         /* We raced with a delegation return */
7585         nfs4_delete_lease(file, priv);
7586         return -EAGAIN;
7587 }
7588
7589 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease,
7590                        void **priv)
7591 {
7592         switch (arg) {
7593         case F_RDLCK:
7594         case F_WRLCK:
7595                 return nfs4_add_lease(file, arg, lease, priv);
7596         case F_UNLCK:
7597                 return nfs4_delete_lease(file, priv);
7598         default:
7599                 return -EINVAL;
7600         }
7601 }
7602
7603 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7604 {
7605         struct nfs_server *server = NFS_SERVER(state->inode);
7606         int err;
7607
7608         err = nfs4_set_lock_state(state, fl);
7609         if (err != 0)
7610                 return err;
7611         do {
7612                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7613                 if (err != -NFS4ERR_DELAY)
7614                         break;
7615                 ssleep(1);
7616         } while (err == -NFS4ERR_DELAY);
7617         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7618 }
7619
7620 struct nfs_release_lockowner_data {
7621         struct nfs4_lock_state *lsp;
7622         struct nfs_server *server;
7623         struct nfs_release_lockowner_args args;
7624         struct nfs_release_lockowner_res res;
7625         unsigned long timestamp;
7626 };
7627
7628 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7629 {
7630         struct nfs_release_lockowner_data *data = calldata;
7631         struct nfs_server *server = data->server;
7632         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7633                            &data->res.seq_res, task);
7634         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7635         data->timestamp = jiffies;
7636 }
7637
7638 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7639 {
7640         struct nfs_release_lockowner_data *data = calldata;
7641         struct nfs_server *server = data->server;
7642
7643         nfs40_sequence_done(task, &data->res.seq_res);
7644
7645         switch (task->tk_status) {
7646         case 0:
7647                 renew_lease(server, data->timestamp);
7648                 break;
7649         case -NFS4ERR_STALE_CLIENTID:
7650         case -NFS4ERR_EXPIRED:
7651                 nfs4_schedule_lease_recovery(server->nfs_client);
7652                 break;
7653         case -NFS4ERR_LEASE_MOVED:
7654         case -NFS4ERR_DELAY:
7655                 if (nfs4_async_handle_error(task, server,
7656                                             NULL, NULL) == -EAGAIN)
7657                         rpc_restart_call_prepare(task);
7658         }
7659 }
7660
7661 static void nfs4_release_lockowner_release(void *calldata)
7662 {
7663         struct nfs_release_lockowner_data *data = calldata;
7664         nfs4_free_lock_state(data->server, data->lsp);
7665         kfree(calldata);
7666 }
7667
7668 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7669         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7670         .rpc_call_done = nfs4_release_lockowner_done,
7671         .rpc_release = nfs4_release_lockowner_release,
7672 };
7673
7674 static void
7675 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7676 {
7677         struct nfs_release_lockowner_data *data;
7678         struct rpc_message msg = {
7679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7680         };
7681
7682         if (server->nfs_client->cl_mvops->minor_version != 0)
7683                 return;
7684
7685         data = kmalloc(sizeof(*data), GFP_KERNEL);
7686         if (!data)
7687                 return;
7688         data->lsp = lsp;
7689         data->server = server;
7690         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7691         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7692         data->args.lock_owner.s_dev = server->s_dev;
7693
7694         msg.rpc_argp = &data->args;
7695         msg.rpc_resp = &data->res;
7696         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7697         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7698 }
7699
7700 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7701
7702 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7703                                    struct mnt_idmap *idmap,
7704                                    struct dentry *unused, struct inode *inode,
7705                                    const char *key, const void *buf,
7706                                    size_t buflen, int flags)
7707 {
7708         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7709 }
7710
7711 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7712                                    struct dentry *unused, struct inode *inode,
7713                                    const char *key, void *buf, size_t buflen)
7714 {
7715         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7716 }
7717
7718 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7719 {
7720         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7721 }
7722
7723 #if defined(CONFIG_NFS_V4_1)
7724 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7725
7726 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7727                                     struct mnt_idmap *idmap,
7728                                     struct dentry *unused, struct inode *inode,
7729                                     const char *key, const void *buf,
7730                                     size_t buflen, int flags)
7731 {
7732         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7733 }
7734
7735 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7736                                     struct dentry *unused, struct inode *inode,
7737                                     const char *key, void *buf, size_t buflen)
7738 {
7739         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7740 }
7741
7742 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7743 {
7744         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7745 }
7746
7747 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7748
7749 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7750                                     struct mnt_idmap *idmap,
7751                                     struct dentry *unused, struct inode *inode,
7752                                     const char *key, const void *buf,
7753                                     size_t buflen, int flags)
7754 {
7755         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7756 }
7757
7758 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7759                                     struct dentry *unused, struct inode *inode,
7760                                     const char *key, void *buf, size_t buflen)
7761 {
7762         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7763 }
7764
7765 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7766 {
7767         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7768 }
7769
7770 #endif
7771
7772 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7773
7774 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7775                                      struct mnt_idmap *idmap,
7776                                      struct dentry *unused, struct inode *inode,
7777                                      const char *key, const void *buf,
7778                                      size_t buflen, int flags)
7779 {
7780         if (security_ismaclabel(key))
7781                 return nfs4_set_security_label(inode, buf, buflen);
7782
7783         return -EOPNOTSUPP;
7784 }
7785
7786 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7787                                      struct dentry *unused, struct inode *inode,
7788                                      const char *key, void *buf, size_t buflen)
7789 {
7790         if (security_ismaclabel(key))
7791                 return nfs4_get_security_label(inode, buf, buflen);
7792         return -EOPNOTSUPP;
7793 }
7794
7795 static ssize_t
7796 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7797 {
7798         int len = 0;
7799
7800         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7801                 len = security_inode_listsecurity(inode, list, list_len);
7802                 if (len >= 0 && list_len && len > list_len)
7803                         return -ERANGE;
7804         }
7805         return len;
7806 }
7807
7808 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7809         .prefix = XATTR_SECURITY_PREFIX,
7810         .get    = nfs4_xattr_get_nfs4_label,
7811         .set    = nfs4_xattr_set_nfs4_label,
7812 };
7813
7814 #else
7815
7816 static ssize_t
7817 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7818 {
7819         return 0;
7820 }
7821
7822 #endif
7823
7824 #ifdef CONFIG_NFS_V4_2
7825 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7826                                     struct mnt_idmap *idmap,
7827                                     struct dentry *unused, struct inode *inode,
7828                                     const char *key, const void *buf,
7829                                     size_t buflen, int flags)
7830 {
7831         u32 mask;
7832         int ret;
7833
7834         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7835                 return -EOPNOTSUPP;
7836
7837         /*
7838          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7839          * flags right now. Handling of xattr operations use the normal
7840          * file read/write permissions.
7841          *
7842          * Just in case the server has other ideas (which RFC 8276 allows),
7843          * do a cached access check for the XA* flags to possibly avoid
7844          * doing an RPC and getting EACCES back.
7845          */
7846         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7847                 if (!(mask & NFS_ACCESS_XAWRITE))
7848                         return -EACCES;
7849         }
7850
7851         if (buf == NULL) {
7852                 ret = nfs42_proc_removexattr(inode, key);
7853                 if (!ret)
7854                         nfs4_xattr_cache_remove(inode, key);
7855         } else {
7856                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7857                 if (!ret)
7858                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7859         }
7860
7861         return ret;
7862 }
7863
7864 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7865                                     struct dentry *unused, struct inode *inode,
7866                                     const char *key, void *buf, size_t buflen)
7867 {
7868         u32 mask;
7869         ssize_t ret;
7870
7871         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7872                 return -EOPNOTSUPP;
7873
7874         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7875                 if (!(mask & NFS_ACCESS_XAREAD))
7876                         return -EACCES;
7877         }
7878
7879         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7880         if (ret)
7881                 return ret;
7882
7883         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7884         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7885                 return ret;
7886
7887         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7888
7889         return ret;
7890 }
7891
7892 static ssize_t
7893 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7894 {
7895         u64 cookie;
7896         bool eof;
7897         ssize_t ret, size;
7898         char *buf;
7899         size_t buflen;
7900         u32 mask;
7901
7902         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7903                 return 0;
7904
7905         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7906                 if (!(mask & NFS_ACCESS_XALIST))
7907                         return 0;
7908         }
7909
7910         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7911         if (ret)
7912                 return ret;
7913
7914         ret = nfs4_xattr_cache_list(inode, list, list_len);
7915         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7916                 return ret;
7917
7918         cookie = 0;
7919         eof = false;
7920         buflen = list_len ? list_len : XATTR_LIST_MAX;
7921         buf = list_len ? list : NULL;
7922         size = 0;
7923
7924         while (!eof) {
7925                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7926                     &cookie, &eof);
7927                 if (ret < 0)
7928                         return ret;
7929
7930                 if (list_len) {
7931                         buf += ret;
7932                         buflen -= ret;
7933                 }
7934                 size += ret;
7935         }
7936
7937         if (list_len)
7938                 nfs4_xattr_cache_set_list(inode, list, size);
7939
7940         return size;
7941 }
7942
7943 #else
7944
7945 static ssize_t
7946 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7947 {
7948         return 0;
7949 }
7950 #endif /* CONFIG_NFS_V4_2 */
7951
7952 /*
7953  * nfs_fhget will use either the mounted_on_fileid or the fileid
7954  */
7955 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7956 {
7957         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7958                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7959               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7960               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7961                 return;
7962
7963         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7964                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7965         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7966         fattr->nlink = 2;
7967 }
7968
7969 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7970                                    const struct qstr *name,
7971                                    struct nfs4_fs_locations *fs_locations,
7972                                    struct page *page)
7973 {
7974         struct nfs_server *server = NFS_SERVER(dir);
7975         u32 bitmask[3];
7976         struct nfs4_fs_locations_arg args = {
7977                 .dir_fh = NFS_FH(dir),
7978                 .name = name,
7979                 .page = page,
7980                 .bitmask = bitmask,
7981         };
7982         struct nfs4_fs_locations_res res = {
7983                 .fs_locations = fs_locations,
7984         };
7985         struct rpc_message msg = {
7986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7987                 .rpc_argp = &args,
7988                 .rpc_resp = &res,
7989         };
7990         int status;
7991
7992         dprintk("%s: start\n", __func__);
7993
7994         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7995         bitmask[1] = nfs4_fattr_bitmap[1];
7996
7997         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7998          * is not supported */
7999         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8000                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8001         else
8002                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8003
8004         nfs_fattr_init(fs_locations->fattr);
8005         fs_locations->server = server;
8006         fs_locations->nlocations = 0;
8007         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8008         dprintk("%s: returned status = %d\n", __func__, status);
8009         return status;
8010 }
8011
8012 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8013                            const struct qstr *name,
8014                            struct nfs4_fs_locations *fs_locations,
8015                            struct page *page)
8016 {
8017         struct nfs4_exception exception = {
8018                 .interruptible = true,
8019         };
8020         int err;
8021         do {
8022                 err = _nfs4_proc_fs_locations(client, dir, name,
8023                                 fs_locations, page);
8024                 trace_nfs4_get_fs_locations(dir, name, err);
8025                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8026                                 &exception);
8027         } while (exception.retry);
8028         return err;
8029 }
8030
8031 /*
8032  * This operation also signals the server that this client is
8033  * performing migration recovery.  The server can stop returning
8034  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8035  * appended to this compound to identify the client ID which is
8036  * performing recovery.
8037  */
8038 static int _nfs40_proc_get_locations(struct nfs_server *server,
8039                                      struct nfs_fh *fhandle,
8040                                      struct nfs4_fs_locations *locations,
8041                                      struct page *page, const struct cred *cred)
8042 {
8043         struct rpc_clnt *clnt = server->client;
8044         u32 bitmask[2] = {
8045                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8046         };
8047         struct nfs4_fs_locations_arg args = {
8048                 .clientid       = server->nfs_client->cl_clientid,
8049                 .fh             = fhandle,
8050                 .page           = page,
8051                 .bitmask        = bitmask,
8052                 .migration      = 1,            /* skip LOOKUP */
8053                 .renew          = 1,            /* append RENEW */
8054         };
8055         struct nfs4_fs_locations_res res = {
8056                 .fs_locations   = locations,
8057                 .migration      = 1,
8058                 .renew          = 1,
8059         };
8060         struct rpc_message msg = {
8061                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8062                 .rpc_argp       = &args,
8063                 .rpc_resp       = &res,
8064                 .rpc_cred       = cred,
8065         };
8066         unsigned long now = jiffies;
8067         int status;
8068
8069         nfs_fattr_init(locations->fattr);
8070         locations->server = server;
8071         locations->nlocations = 0;
8072
8073         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8074         status = nfs4_call_sync_sequence(clnt, server, &msg,
8075                                         &args.seq_args, &res.seq_res);
8076         if (status)
8077                 return status;
8078
8079         renew_lease(server, now);
8080         return 0;
8081 }
8082
8083 #ifdef CONFIG_NFS_V4_1
8084
8085 /*
8086  * This operation also signals the server that this client is
8087  * performing migration recovery.  The server can stop asserting
8088  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8089  * performing this operation is identified in the SEQUENCE
8090  * operation in this compound.
8091  *
8092  * When the client supports GETATTR(fs_locations_info), it can
8093  * be plumbed in here.
8094  */
8095 static int _nfs41_proc_get_locations(struct nfs_server *server,
8096                                      struct nfs_fh *fhandle,
8097                                      struct nfs4_fs_locations *locations,
8098                                      struct page *page, const struct cred *cred)
8099 {
8100         struct rpc_clnt *clnt = server->client;
8101         u32 bitmask[2] = {
8102                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8103         };
8104         struct nfs4_fs_locations_arg args = {
8105                 .fh             = fhandle,
8106                 .page           = page,
8107                 .bitmask        = bitmask,
8108                 .migration      = 1,            /* skip LOOKUP */
8109         };
8110         struct nfs4_fs_locations_res res = {
8111                 .fs_locations   = locations,
8112                 .migration      = 1,
8113         };
8114         struct rpc_message msg = {
8115                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8116                 .rpc_argp       = &args,
8117                 .rpc_resp       = &res,
8118                 .rpc_cred       = cred,
8119         };
8120         struct nfs4_call_sync_data data = {
8121                 .seq_server = server,
8122                 .seq_args = &args.seq_args,
8123                 .seq_res = &res.seq_res,
8124         };
8125         struct rpc_task_setup task_setup_data = {
8126                 .rpc_client = clnt,
8127                 .rpc_message = &msg,
8128                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8129                 .callback_data = &data,
8130                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8131         };
8132         int status;
8133
8134         nfs_fattr_init(locations->fattr);
8135         locations->server = server;
8136         locations->nlocations = 0;
8137
8138         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8139         status = nfs4_call_sync_custom(&task_setup_data);
8140         if (status == NFS4_OK &&
8141             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8142                 status = -NFS4ERR_LEASE_MOVED;
8143         return status;
8144 }
8145
8146 #endif  /* CONFIG_NFS_V4_1 */
8147
8148 /**
8149  * nfs4_proc_get_locations - discover locations for a migrated FSID
8150  * @server: pointer to nfs_server to process
8151  * @fhandle: pointer to the kernel NFS client file handle
8152  * @locations: result of query
8153  * @page: buffer
8154  * @cred: credential to use for this operation
8155  *
8156  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8157  * operation failed, or a negative errno if a local error occurred.
8158  *
8159  * On success, "locations" is filled in, but if the server has
8160  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8161  * asserted.
8162  *
8163  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8164  * from this client that require migration recovery.
8165  */
8166 int nfs4_proc_get_locations(struct nfs_server *server,
8167                             struct nfs_fh *fhandle,
8168                             struct nfs4_fs_locations *locations,
8169                             struct page *page, const struct cred *cred)
8170 {
8171         struct nfs_client *clp = server->nfs_client;
8172         const struct nfs4_mig_recovery_ops *ops =
8173                                         clp->cl_mvops->mig_recovery_ops;
8174         struct nfs4_exception exception = {
8175                 .interruptible = true,
8176         };
8177         int status;
8178
8179         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8180                 (unsigned long long)server->fsid.major,
8181                 (unsigned long long)server->fsid.minor,
8182                 clp->cl_hostname);
8183         nfs_display_fhandle(fhandle, __func__);
8184
8185         do {
8186                 status = ops->get_locations(server, fhandle, locations, page,
8187                                             cred);
8188                 if (status != -NFS4ERR_DELAY)
8189                         break;
8190                 nfs4_handle_exception(server, status, &exception);
8191         } while (exception.retry);
8192         return status;
8193 }
8194
8195 /*
8196  * This operation also signals the server that this client is
8197  * performing "lease moved" recovery.  The server can stop
8198  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8199  * is appended to this compound to identify the client ID which is
8200  * performing recovery.
8201  */
8202 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8203 {
8204         struct nfs_server *server = NFS_SERVER(inode);
8205         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8206         struct rpc_clnt *clnt = server->client;
8207         struct nfs4_fsid_present_arg args = {
8208                 .fh             = NFS_FH(inode),
8209                 .clientid       = clp->cl_clientid,
8210                 .renew          = 1,            /* append RENEW */
8211         };
8212         struct nfs4_fsid_present_res res = {
8213                 .renew          = 1,
8214         };
8215         struct rpc_message msg = {
8216                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8217                 .rpc_argp       = &args,
8218                 .rpc_resp       = &res,
8219                 .rpc_cred       = cred,
8220         };
8221         unsigned long now = jiffies;
8222         int status;
8223
8224         res.fh = nfs_alloc_fhandle();
8225         if (res.fh == NULL)
8226                 return -ENOMEM;
8227
8228         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8229         status = nfs4_call_sync_sequence(clnt, server, &msg,
8230                                                 &args.seq_args, &res.seq_res);
8231         nfs_free_fhandle(res.fh);
8232         if (status)
8233                 return status;
8234
8235         do_renew_lease(clp, now);
8236         return 0;
8237 }
8238
8239 #ifdef CONFIG_NFS_V4_1
8240
8241 /*
8242  * This operation also signals the server that this client is
8243  * performing "lease moved" recovery.  The server can stop asserting
8244  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8245  * this operation is identified in the SEQUENCE operation in this
8246  * compound.
8247  */
8248 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8249 {
8250         struct nfs_server *server = NFS_SERVER(inode);
8251         struct rpc_clnt *clnt = server->client;
8252         struct nfs4_fsid_present_arg args = {
8253                 .fh             = NFS_FH(inode),
8254         };
8255         struct nfs4_fsid_present_res res = {
8256         };
8257         struct rpc_message msg = {
8258                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8259                 .rpc_argp       = &args,
8260                 .rpc_resp       = &res,
8261                 .rpc_cred       = cred,
8262         };
8263         int status;
8264
8265         res.fh = nfs_alloc_fhandle();
8266         if (res.fh == NULL)
8267                 return -ENOMEM;
8268
8269         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8270         status = nfs4_call_sync_sequence(clnt, server, &msg,
8271                                                 &args.seq_args, &res.seq_res);
8272         nfs_free_fhandle(res.fh);
8273         if (status == NFS4_OK &&
8274             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8275                 status = -NFS4ERR_LEASE_MOVED;
8276         return status;
8277 }
8278
8279 #endif  /* CONFIG_NFS_V4_1 */
8280
8281 /**
8282  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8283  * @inode: inode on FSID to check
8284  * @cred: credential to use for this operation
8285  *
8286  * Server indicates whether the FSID is present, moved, or not
8287  * recognized.  This operation is necessary to clear a LEASE_MOVED
8288  * condition for this client ID.
8289  *
8290  * Returns NFS4_OK if the FSID is present on this server,
8291  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8292  *  NFS4ERR code if some error occurred on the server, or a
8293  *  negative errno if a local failure occurred.
8294  */
8295 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8296 {
8297         struct nfs_server *server = NFS_SERVER(inode);
8298         struct nfs_client *clp = server->nfs_client;
8299         const struct nfs4_mig_recovery_ops *ops =
8300                                         clp->cl_mvops->mig_recovery_ops;
8301         struct nfs4_exception exception = {
8302                 .interruptible = true,
8303         };
8304         int status;
8305
8306         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8307                 (unsigned long long)server->fsid.major,
8308                 (unsigned long long)server->fsid.minor,
8309                 clp->cl_hostname);
8310         nfs_display_fhandle(NFS_FH(inode), __func__);
8311
8312         do {
8313                 status = ops->fsid_present(inode, cred);
8314                 if (status != -NFS4ERR_DELAY)
8315                         break;
8316                 nfs4_handle_exception(server, status, &exception);
8317         } while (exception.retry);
8318         return status;
8319 }
8320
8321 /*
8322  * If 'use_integrity' is true and the state managment nfs_client
8323  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8324  * and the machine credential as per RFC3530bis and RFC5661 Security
8325  * Considerations sections. Otherwise, just use the user cred with the
8326  * filesystem's rpc_client.
8327  */
8328 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8329 {
8330         int status;
8331         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8332         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8333         struct nfs4_secinfo_arg args = {
8334                 .dir_fh = NFS_FH(dir),
8335                 .name   = name,
8336         };
8337         struct nfs4_secinfo_res res = {
8338                 .flavors     = flavors,
8339         };
8340         struct rpc_message msg = {
8341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8342                 .rpc_argp = &args,
8343                 .rpc_resp = &res,
8344         };
8345         struct nfs4_call_sync_data data = {
8346                 .seq_server = NFS_SERVER(dir),
8347                 .seq_args = &args.seq_args,
8348                 .seq_res = &res.seq_res,
8349         };
8350         struct rpc_task_setup task_setup = {
8351                 .rpc_client = clnt,
8352                 .rpc_message = &msg,
8353                 .callback_ops = clp->cl_mvops->call_sync_ops,
8354                 .callback_data = &data,
8355                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8356         };
8357         const struct cred *cred = NULL;
8358
8359         if (use_integrity) {
8360                 clnt = clp->cl_rpcclient;
8361                 task_setup.rpc_client = clnt;
8362
8363                 cred = nfs4_get_clid_cred(clp);
8364                 msg.rpc_cred = cred;
8365         }
8366
8367         dprintk("NFS call  secinfo %s\n", name->name);
8368
8369         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8370         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8371         status = nfs4_call_sync_custom(&task_setup);
8372
8373         dprintk("NFS reply  secinfo: %d\n", status);
8374
8375         put_cred(cred);
8376         return status;
8377 }
8378
8379 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8380                       struct nfs4_secinfo_flavors *flavors)
8381 {
8382         struct nfs4_exception exception = {
8383                 .interruptible = true,
8384         };
8385         int err;
8386         do {
8387                 err = -NFS4ERR_WRONGSEC;
8388
8389                 /* try to use integrity protection with machine cred */
8390                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8391                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8392
8393                 /*
8394                  * if unable to use integrity protection, or SECINFO with
8395                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8396                  * disallowed by spec, but exists in deployed servers) use
8397                  * the current filesystem's rpc_client and the user cred.
8398                  */
8399                 if (err == -NFS4ERR_WRONGSEC)
8400                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8401
8402                 trace_nfs4_secinfo(dir, name, err);
8403                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8404                                 &exception);
8405         } while (exception.retry);
8406         return err;
8407 }
8408
8409 #ifdef CONFIG_NFS_V4_1
8410 /*
8411  * Check the exchange flags returned by the server for invalid flags, having
8412  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8413  * DS flags set.
8414  */
8415 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8416 {
8417         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8418                 goto out_inval;
8419         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8420                 goto out_inval;
8421         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8422             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8423                 goto out_inval;
8424         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8425                 goto out_inval;
8426         return NFS_OK;
8427 out_inval:
8428         return -NFS4ERR_INVAL;
8429 }
8430
8431 static bool
8432 nfs41_same_server_scope(struct nfs41_server_scope *a,
8433                         struct nfs41_server_scope *b)
8434 {
8435         if (a->server_scope_sz != b->server_scope_sz)
8436                 return false;
8437         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8438 }
8439
8440 static void
8441 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8442 {
8443         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8444         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8445         struct nfs_client *clp = args->client;
8446
8447         switch (task->tk_status) {
8448         case -NFS4ERR_BADSESSION:
8449         case -NFS4ERR_DEADSESSION:
8450                 nfs4_schedule_session_recovery(clp->cl_session,
8451                                 task->tk_status);
8452                 return;
8453         }
8454         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8455                         res->dir != NFS4_CDFS4_BOTH) {
8456                 rpc_task_close_connection(task);
8457                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8458                         rpc_restart_call(task);
8459         }
8460 }
8461
8462 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8463         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8464 };
8465
8466 /*
8467  * nfs4_proc_bind_one_conn_to_session()
8468  *
8469  * The 4.1 client currently uses the same TCP connection for the
8470  * fore and backchannel.
8471  */
8472 static
8473 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8474                 struct rpc_xprt *xprt,
8475                 struct nfs_client *clp,
8476                 const struct cred *cred)
8477 {
8478         int status;
8479         struct nfs41_bind_conn_to_session_args args = {
8480                 .client = clp,
8481                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8482                 .retries = 0,
8483         };
8484         struct nfs41_bind_conn_to_session_res res;
8485         struct rpc_message msg = {
8486                 .rpc_proc =
8487                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8488                 .rpc_argp = &args,
8489                 .rpc_resp = &res,
8490                 .rpc_cred = cred,
8491         };
8492         struct rpc_task_setup task_setup_data = {
8493                 .rpc_client = clnt,
8494                 .rpc_xprt = xprt,
8495                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8496                 .rpc_message = &msg,
8497                 .flags = RPC_TASK_TIMEOUT,
8498         };
8499         struct rpc_task *task;
8500
8501         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8502         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8503                 args.dir = NFS4_CDFC4_FORE;
8504
8505         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8506         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8507                 args.dir = NFS4_CDFC4_FORE;
8508
8509         task = rpc_run_task(&task_setup_data);
8510         if (!IS_ERR(task)) {
8511                 status = task->tk_status;
8512                 rpc_put_task(task);
8513         } else
8514                 status = PTR_ERR(task);
8515         trace_nfs4_bind_conn_to_session(clp, status);
8516         if (status == 0) {
8517                 if (memcmp(res.sessionid.data,
8518                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8519                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8520                         return -EIO;
8521                 }
8522                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8523                         dprintk("NFS: %s: Unexpected direction from server\n",
8524                                 __func__);
8525                         return -EIO;
8526                 }
8527                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8528                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8529                                 __func__);
8530                         return -EIO;
8531                 }
8532         }
8533
8534         return status;
8535 }
8536
8537 struct rpc_bind_conn_calldata {
8538         struct nfs_client *clp;
8539         const struct cred *cred;
8540 };
8541
8542 static int
8543 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8544                 struct rpc_xprt *xprt,
8545                 void *calldata)
8546 {
8547         struct rpc_bind_conn_calldata *p = calldata;
8548
8549         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8550 }
8551
8552 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8553 {
8554         struct rpc_bind_conn_calldata data = {
8555                 .clp = clp,
8556                 .cred = cred,
8557         };
8558         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8559                         nfs4_proc_bind_conn_to_session_callback, &data);
8560 }
8561
8562 /*
8563  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8564  * and operations we'd like to see to enable certain features in the allow map
8565  */
8566 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8567         .how = SP4_MACH_CRED,
8568         .enforce.u.words = {
8569                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8570                       1 << (OP_EXCHANGE_ID - 32) |
8571                       1 << (OP_CREATE_SESSION - 32) |
8572                       1 << (OP_DESTROY_SESSION - 32) |
8573                       1 << (OP_DESTROY_CLIENTID - 32)
8574         },
8575         .allow.u.words = {
8576                 [0] = 1 << (OP_CLOSE) |
8577                       1 << (OP_OPEN_DOWNGRADE) |
8578                       1 << (OP_LOCKU) |
8579                       1 << (OP_DELEGRETURN) |
8580                       1 << (OP_COMMIT),
8581                 [1] = 1 << (OP_SECINFO - 32) |
8582                       1 << (OP_SECINFO_NO_NAME - 32) |
8583                       1 << (OP_LAYOUTRETURN - 32) |
8584                       1 << (OP_TEST_STATEID - 32) |
8585                       1 << (OP_FREE_STATEID - 32) |
8586                       1 << (OP_WRITE - 32)
8587         }
8588 };
8589
8590 /*
8591  * Select the state protection mode for client `clp' given the server results
8592  * from exchange_id in `sp'.
8593  *
8594  * Returns 0 on success, negative errno otherwise.
8595  */
8596 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8597                                  struct nfs41_state_protection *sp)
8598 {
8599         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8600                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8601                       1 << (OP_EXCHANGE_ID - 32) |
8602                       1 << (OP_CREATE_SESSION - 32) |
8603                       1 << (OP_DESTROY_SESSION - 32) |
8604                       1 << (OP_DESTROY_CLIENTID - 32)
8605         };
8606         unsigned long flags = 0;
8607         unsigned int i;
8608         int ret = 0;
8609
8610         if (sp->how == SP4_MACH_CRED) {
8611                 /* Print state protect result */
8612                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8613                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8614                         if (test_bit(i, sp->enforce.u.longs))
8615                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8616                         if (test_bit(i, sp->allow.u.longs))
8617                                 dfprintk(MOUNT, "  allow op %d\n", i);
8618                 }
8619
8620                 /* make sure nothing is on enforce list that isn't supported */
8621                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8622                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8623                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8624                                 ret = -EINVAL;
8625                                 goto out;
8626                         }
8627                 }
8628
8629                 /*
8630                  * Minimal mode - state operations are allowed to use machine
8631                  * credential.  Note this already happens by default, so the
8632                  * client doesn't have to do anything more than the negotiation.
8633                  *
8634                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8635                  *       we're already using the machine cred for exchange_id
8636                  *       and will never use a different cred.
8637                  */
8638                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8639                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8640                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8641                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8642                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8643                         dfprintk(MOUNT, "  minimal mode enabled\n");
8644                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8645                 } else {
8646                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8647                         ret = -EINVAL;
8648                         goto out;
8649                 }
8650
8651                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8652                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8653                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8654                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8655                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8656                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8657                 }
8658
8659                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8660                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8661                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8662                 }
8663
8664                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8665                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8666                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8667                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8668                 }
8669
8670                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8671                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8672                         dfprintk(MOUNT, "  stateid mode enabled\n");
8673                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8674                 }
8675
8676                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8677                         dfprintk(MOUNT, "  write mode enabled\n");
8678                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8679                 }
8680
8681                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8682                         dfprintk(MOUNT, "  commit mode enabled\n");
8683                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8684                 }
8685         }
8686 out:
8687         clp->cl_sp4_flags = flags;
8688         return ret;
8689 }
8690
8691 struct nfs41_exchange_id_data {
8692         struct nfs41_exchange_id_res res;
8693         struct nfs41_exchange_id_args args;
8694 };
8695
8696 static void nfs4_exchange_id_release(void *data)
8697 {
8698         struct nfs41_exchange_id_data *cdata =
8699                                         (struct nfs41_exchange_id_data *)data;
8700
8701         nfs_put_client(cdata->args.client);
8702         kfree(cdata->res.impl_id);
8703         kfree(cdata->res.server_scope);
8704         kfree(cdata->res.server_owner);
8705         kfree(cdata);
8706 }
8707
8708 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8709         .rpc_release = nfs4_exchange_id_release,
8710 };
8711
8712 /*
8713  * _nfs4_proc_exchange_id()
8714  *
8715  * Wrapper for EXCHANGE_ID operation.
8716  */
8717 static struct rpc_task *
8718 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8719                         u32 sp4_how, struct rpc_xprt *xprt)
8720 {
8721         struct rpc_message msg = {
8722                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8723                 .rpc_cred = cred,
8724         };
8725         struct rpc_task_setup task_setup_data = {
8726                 .rpc_client = clp->cl_rpcclient,
8727                 .callback_ops = &nfs4_exchange_id_call_ops,
8728                 .rpc_message = &msg,
8729                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8730         };
8731         struct nfs41_exchange_id_data *calldata;
8732         int status;
8733
8734         if (!refcount_inc_not_zero(&clp->cl_count))
8735                 return ERR_PTR(-EIO);
8736
8737         status = -ENOMEM;
8738         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8739         if (!calldata)
8740                 goto out;
8741
8742         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8743
8744         status = nfs4_init_uniform_client_string(clp);
8745         if (status)
8746                 goto out_calldata;
8747
8748         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8749                                                 GFP_NOFS);
8750         status = -ENOMEM;
8751         if (unlikely(calldata->res.server_owner == NULL))
8752                 goto out_calldata;
8753
8754         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8755                                         GFP_NOFS);
8756         if (unlikely(calldata->res.server_scope == NULL))
8757                 goto out_server_owner;
8758
8759         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8760         if (unlikely(calldata->res.impl_id == NULL))
8761                 goto out_server_scope;
8762
8763         switch (sp4_how) {
8764         case SP4_NONE:
8765                 calldata->args.state_protect.how = SP4_NONE;
8766                 break;
8767
8768         case SP4_MACH_CRED:
8769                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8770                 break;
8771
8772         default:
8773                 /* unsupported! */
8774                 WARN_ON_ONCE(1);
8775                 status = -EINVAL;
8776                 goto out_impl_id;
8777         }
8778         if (xprt) {
8779                 task_setup_data.rpc_xprt = xprt;
8780                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8781                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8782                                 sizeof(calldata->args.verifier.data));
8783         }
8784         calldata->args.client = clp;
8785         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8786         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8787 #ifdef CONFIG_NFS_V4_1_MIGRATION
8788         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8789 #endif
8790         if (test_bit(NFS_CS_DS, &clp->cl_flags))
8791                 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8792         msg.rpc_argp = &calldata->args;
8793         msg.rpc_resp = &calldata->res;
8794         task_setup_data.callback_data = calldata;
8795
8796         return rpc_run_task(&task_setup_data);
8797
8798 out_impl_id:
8799         kfree(calldata->res.impl_id);
8800 out_server_scope:
8801         kfree(calldata->res.server_scope);
8802 out_server_owner:
8803         kfree(calldata->res.server_owner);
8804 out_calldata:
8805         kfree(calldata);
8806 out:
8807         nfs_put_client(clp);
8808         return ERR_PTR(status);
8809 }
8810
8811 /*
8812  * _nfs4_proc_exchange_id()
8813  *
8814  * Wrapper for EXCHANGE_ID operation.
8815  */
8816 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8817                         u32 sp4_how)
8818 {
8819         struct rpc_task *task;
8820         struct nfs41_exchange_id_args *argp;
8821         struct nfs41_exchange_id_res *resp;
8822         unsigned long now = jiffies;
8823         int status;
8824
8825         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8826         if (IS_ERR(task))
8827                 return PTR_ERR(task);
8828
8829         argp = task->tk_msg.rpc_argp;
8830         resp = task->tk_msg.rpc_resp;
8831         status = task->tk_status;
8832         if (status  != 0)
8833                 goto out;
8834
8835         status = nfs4_check_cl_exchange_flags(resp->flags,
8836                         clp->cl_mvops->minor_version);
8837         if (status  != 0)
8838                 goto out;
8839
8840         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8841         if (status != 0)
8842                 goto out;
8843
8844         do_renew_lease(clp, now);
8845
8846         clp->cl_clientid = resp->clientid;
8847         clp->cl_exchange_flags = resp->flags;
8848         clp->cl_seqid = resp->seqid;
8849         /* Client ID is not confirmed */
8850         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8851                 clear_bit(NFS4_SESSION_ESTABLISHED,
8852                           &clp->cl_session->session_state);
8853
8854         if (clp->cl_serverscope != NULL &&
8855             !nfs41_same_server_scope(clp->cl_serverscope,
8856                                 resp->server_scope)) {
8857                 dprintk("%s: server_scope mismatch detected\n",
8858                         __func__);
8859                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8860         }
8861
8862         swap(clp->cl_serverowner, resp->server_owner);
8863         swap(clp->cl_serverscope, resp->server_scope);
8864         swap(clp->cl_implid, resp->impl_id);
8865
8866         /* Save the EXCHANGE_ID verifier session trunk tests */
8867         memcpy(clp->cl_confirm.data, argp->verifier.data,
8868                sizeof(clp->cl_confirm.data));
8869         if (resp->flags & EXCHGID4_FLAG_USE_PNFS_DS)
8870                 set_bit(NFS_CS_DS, &clp->cl_flags);
8871 out:
8872         trace_nfs4_exchange_id(clp, status);
8873         rpc_put_task(task);
8874         return status;
8875 }
8876
8877 /*
8878  * nfs4_proc_exchange_id()
8879  *
8880  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8881  *
8882  * Since the clientid has expired, all compounds using sessions
8883  * associated with the stale clientid will be returning
8884  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8885  * be in some phase of session reset.
8886  *
8887  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8888  */
8889 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8890 {
8891         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8892         int status;
8893
8894         /* try SP4_MACH_CRED if krb5i/p */
8895         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8896             authflavor == RPC_AUTH_GSS_KRB5P) {
8897                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8898                 if (!status)
8899                         return 0;
8900         }
8901
8902         /* try SP4_NONE */
8903         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8904 }
8905
8906 /**
8907  * nfs4_test_session_trunk
8908  *
8909  * This is an add_xprt_test() test function called from
8910  * rpc_clnt_setup_test_and_add_xprt.
8911  *
8912  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8913  * and is dereferrenced in nfs4_exchange_id_release
8914  *
8915  * Upon success, add the new transport to the rpc_clnt
8916  *
8917  * @clnt: struct rpc_clnt to get new transport
8918  * @xprt: the rpc_xprt to test
8919  * @data: call data for _nfs4_proc_exchange_id.
8920  */
8921 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8922                             void *data)
8923 {
8924         struct nfs4_add_xprt_data *adata = data;
8925         struct rpc_task *task;
8926         int status;
8927
8928         u32 sp4_how;
8929
8930         dprintk("--> %s try %s\n", __func__,
8931                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8932
8933         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8934
8935         /* Test connection for session trunking. Async exchange_id call */
8936         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8937         if (IS_ERR(task))
8938                 return;
8939
8940         status = task->tk_status;
8941         if (status == 0)
8942                 status = nfs4_detect_session_trunking(adata->clp,
8943                                 task->tk_msg.rpc_resp, xprt);
8944
8945         if (status == 0)
8946                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8947         else if (rpc_clnt_xprt_switch_has_addr(clnt,
8948                                 (struct sockaddr *)&xprt->addr))
8949                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8950
8951         rpc_put_task(task);
8952 }
8953 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8954
8955 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8956                 const struct cred *cred)
8957 {
8958         struct rpc_message msg = {
8959                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8960                 .rpc_argp = clp,
8961                 .rpc_cred = cred,
8962         };
8963         int status;
8964
8965         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8966                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8967         trace_nfs4_destroy_clientid(clp, status);
8968         if (status)
8969                 dprintk("NFS: Got error %d from the server %s on "
8970                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8971         return status;
8972 }
8973
8974 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8975                 const struct cred *cred)
8976 {
8977         unsigned int loop;
8978         int ret;
8979
8980         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8981                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8982                 switch (ret) {
8983                 case -NFS4ERR_DELAY:
8984                 case -NFS4ERR_CLIENTID_BUSY:
8985                         ssleep(1);
8986                         break;
8987                 default:
8988                         return ret;
8989                 }
8990         }
8991         return 0;
8992 }
8993
8994 int nfs4_destroy_clientid(struct nfs_client *clp)
8995 {
8996         const struct cred *cred;
8997         int ret = 0;
8998
8999         if (clp->cl_mvops->minor_version < 1)
9000                 goto out;
9001         if (clp->cl_exchange_flags == 0)
9002                 goto out;
9003         if (clp->cl_preserve_clid)
9004                 goto out;
9005         cred = nfs4_get_clid_cred(clp);
9006         ret = nfs4_proc_destroy_clientid(clp, cred);
9007         put_cred(cred);
9008         switch (ret) {
9009         case 0:
9010         case -NFS4ERR_STALE_CLIENTID:
9011                 clp->cl_exchange_flags = 0;
9012         }
9013 out:
9014         return ret;
9015 }
9016
9017 #endif /* CONFIG_NFS_V4_1 */
9018
9019 struct nfs4_get_lease_time_data {
9020         struct nfs4_get_lease_time_args *args;
9021         struct nfs4_get_lease_time_res *res;
9022         struct nfs_client *clp;
9023 };
9024
9025 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9026                                         void *calldata)
9027 {
9028         struct nfs4_get_lease_time_data *data =
9029                         (struct nfs4_get_lease_time_data *)calldata;
9030
9031         /* just setup sequence, do not trigger session recovery
9032            since we're invoked within one */
9033         nfs4_setup_sequence(data->clp,
9034                         &data->args->la_seq_args,
9035                         &data->res->lr_seq_res,
9036                         task);
9037 }
9038
9039 /*
9040  * Called from nfs4_state_manager thread for session setup, so don't recover
9041  * from sequence operation or clientid errors.
9042  */
9043 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9044 {
9045         struct nfs4_get_lease_time_data *data =
9046                         (struct nfs4_get_lease_time_data *)calldata;
9047
9048         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9049                 return;
9050         switch (task->tk_status) {
9051         case -NFS4ERR_DELAY:
9052         case -NFS4ERR_GRACE:
9053                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9054                 task->tk_status = 0;
9055                 fallthrough;
9056         case -NFS4ERR_RETRY_UNCACHED_REP:
9057                 rpc_restart_call_prepare(task);
9058                 return;
9059         }
9060 }
9061
9062 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9063         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9064         .rpc_call_done = nfs4_get_lease_time_done,
9065 };
9066
9067 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9068 {
9069         struct nfs4_get_lease_time_args args;
9070         struct nfs4_get_lease_time_res res = {
9071                 .lr_fsinfo = fsinfo,
9072         };
9073         struct nfs4_get_lease_time_data data = {
9074                 .args = &args,
9075                 .res = &res,
9076                 .clp = clp,
9077         };
9078         struct rpc_message msg = {
9079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9080                 .rpc_argp = &args,
9081                 .rpc_resp = &res,
9082         };
9083         struct rpc_task_setup task_setup = {
9084                 .rpc_client = clp->cl_rpcclient,
9085                 .rpc_message = &msg,
9086                 .callback_ops = &nfs4_get_lease_time_ops,
9087                 .callback_data = &data,
9088                 .flags = RPC_TASK_TIMEOUT,
9089         };
9090
9091         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9092         return nfs4_call_sync_custom(&task_setup);
9093 }
9094
9095 #ifdef CONFIG_NFS_V4_1
9096
9097 /*
9098  * Initialize the values to be used by the client in CREATE_SESSION
9099  * If nfs4_init_session set the fore channel request and response sizes,
9100  * use them.
9101  *
9102  * Set the back channel max_resp_sz_cached to zero to force the client to
9103  * always set csa_cachethis to FALSE because the current implementation
9104  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9105  */
9106 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9107                                     struct rpc_clnt *clnt)
9108 {
9109         unsigned int max_rqst_sz, max_resp_sz;
9110         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9111         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9112
9113         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9114         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9115
9116         /* Fore channel attributes */
9117         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9118         args->fc_attrs.max_resp_sz = max_resp_sz;
9119         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9120         args->fc_attrs.max_reqs = max_session_slots;
9121
9122         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9123                 "max_ops=%u max_reqs=%u\n",
9124                 __func__,
9125                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9126                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9127
9128         /* Back channel attributes */
9129         args->bc_attrs.max_rqst_sz = max_bc_payload;
9130         args->bc_attrs.max_resp_sz = max_bc_payload;
9131         args->bc_attrs.max_resp_sz_cached = 0;
9132         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9133         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9134         if (args->bc_attrs.max_reqs > max_bc_slots)
9135                 args->bc_attrs.max_reqs = max_bc_slots;
9136
9137         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9138                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9139                 __func__,
9140                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9141                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9142                 args->bc_attrs.max_reqs);
9143 }
9144
9145 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9146                 struct nfs41_create_session_res *res)
9147 {
9148         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9149         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9150
9151         if (rcvd->max_resp_sz > sent->max_resp_sz)
9152                 return -EINVAL;
9153         /*
9154          * Our requested max_ops is the minimum we need; we're not
9155          * prepared to break up compounds into smaller pieces than that.
9156          * So, no point even trying to continue if the server won't
9157          * cooperate:
9158          */
9159         if (rcvd->max_ops < sent->max_ops)
9160                 return -EINVAL;
9161         if (rcvd->max_reqs == 0)
9162                 return -EINVAL;
9163         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9164                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9165         return 0;
9166 }
9167
9168 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9169                 struct nfs41_create_session_res *res)
9170 {
9171         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9172         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9173
9174         if (!(res->flags & SESSION4_BACK_CHAN))
9175                 goto out;
9176         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9177                 return -EINVAL;
9178         if (rcvd->max_resp_sz < sent->max_resp_sz)
9179                 return -EINVAL;
9180         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9181                 return -EINVAL;
9182         if (rcvd->max_ops > sent->max_ops)
9183                 return -EINVAL;
9184         if (rcvd->max_reqs > sent->max_reqs)
9185                 return -EINVAL;
9186 out:
9187         return 0;
9188 }
9189
9190 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9191                                      struct nfs41_create_session_res *res)
9192 {
9193         int ret;
9194
9195         ret = nfs4_verify_fore_channel_attrs(args, res);
9196         if (ret)
9197                 return ret;
9198         return nfs4_verify_back_channel_attrs(args, res);
9199 }
9200
9201 static void nfs4_update_session(struct nfs4_session *session,
9202                 struct nfs41_create_session_res *res)
9203 {
9204         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9205         /* Mark client id and session as being confirmed */
9206         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9207         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9208         session->flags = res->flags;
9209         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9210         if (res->flags & SESSION4_BACK_CHAN)
9211                 memcpy(&session->bc_attrs, &res->bc_attrs,
9212                                 sizeof(session->bc_attrs));
9213 }
9214
9215 static int _nfs4_proc_create_session(struct nfs_client *clp,
9216                 const struct cred *cred)
9217 {
9218         struct nfs4_session *session = clp->cl_session;
9219         struct nfs41_create_session_args args = {
9220                 .client = clp,
9221                 .clientid = clp->cl_clientid,
9222                 .seqid = clp->cl_seqid,
9223                 .cb_program = NFS4_CALLBACK,
9224         };
9225         struct nfs41_create_session_res res;
9226
9227         struct rpc_message msg = {
9228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9229                 .rpc_argp = &args,
9230                 .rpc_resp = &res,
9231                 .rpc_cred = cred,
9232         };
9233         int status;
9234
9235         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9236         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9237
9238         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9239                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9240         trace_nfs4_create_session(clp, status);
9241
9242         switch (status) {
9243         case -NFS4ERR_STALE_CLIENTID:
9244         case -NFS4ERR_DELAY:
9245         case -ETIMEDOUT:
9246         case -EACCES:
9247         case -EAGAIN:
9248                 goto out;
9249         }
9250
9251         clp->cl_seqid++;
9252         if (!status) {
9253                 /* Verify the session's negotiated channel_attrs values */
9254                 status = nfs4_verify_channel_attrs(&args, &res);
9255                 /* Increment the clientid slot sequence id */
9256                 if (status)
9257                         goto out;
9258                 nfs4_update_session(session, &res);
9259         }
9260 out:
9261         return status;
9262 }
9263
9264 /*
9265  * Issues a CREATE_SESSION operation to the server.
9266  * It is the responsibility of the caller to verify the session is
9267  * expired before calling this routine.
9268  */
9269 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9270 {
9271         int status;
9272         unsigned *ptr;
9273         struct nfs4_session *session = clp->cl_session;
9274         struct nfs4_add_xprt_data xprtdata = {
9275                 .clp = clp,
9276         };
9277         struct rpc_add_xprt_test rpcdata = {
9278                 .add_xprt_test = clp->cl_mvops->session_trunk,
9279                 .data = &xprtdata,
9280         };
9281
9282         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9283
9284         status = _nfs4_proc_create_session(clp, cred);
9285         if (status)
9286                 goto out;
9287
9288         /* Init or reset the session slot tables */
9289         status = nfs4_setup_session_slot_tables(session);
9290         dprintk("slot table setup returned %d\n", status);
9291         if (status)
9292                 goto out;
9293
9294         ptr = (unsigned *)&session->sess_id.data[0];
9295         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9296                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9297         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9298 out:
9299         return status;
9300 }
9301
9302 /*
9303  * Issue the over-the-wire RPC DESTROY_SESSION.
9304  * The caller must serialize access to this routine.
9305  */
9306 int nfs4_proc_destroy_session(struct nfs4_session *session,
9307                 const struct cred *cred)
9308 {
9309         struct rpc_message msg = {
9310                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9311                 .rpc_argp = session,
9312                 .rpc_cred = cred,
9313         };
9314         int status = 0;
9315
9316         /* session is still being setup */
9317         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9318                 return 0;
9319
9320         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9321                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9322         trace_nfs4_destroy_session(session->clp, status);
9323
9324         if (status)
9325                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9326                         "Session has been destroyed regardless...\n", status);
9327         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9328         return status;
9329 }
9330
9331 /*
9332  * Renew the cl_session lease.
9333  */
9334 struct nfs4_sequence_data {
9335         struct nfs_client *clp;
9336         struct nfs4_sequence_args args;
9337         struct nfs4_sequence_res res;
9338 };
9339
9340 static void nfs41_sequence_release(void *data)
9341 {
9342         struct nfs4_sequence_data *calldata = data;
9343         struct nfs_client *clp = calldata->clp;
9344
9345         if (refcount_read(&clp->cl_count) > 1)
9346                 nfs4_schedule_state_renewal(clp);
9347         nfs_put_client(clp);
9348         kfree(calldata);
9349 }
9350
9351 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9352 {
9353         switch(task->tk_status) {
9354         case -NFS4ERR_DELAY:
9355                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9356                 return -EAGAIN;
9357         default:
9358                 nfs4_schedule_lease_recovery(clp);
9359         }
9360         return 0;
9361 }
9362
9363 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9364 {
9365         struct nfs4_sequence_data *calldata = data;
9366         struct nfs_client *clp = calldata->clp;
9367
9368         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9369                 return;
9370
9371         trace_nfs4_sequence(clp, task->tk_status);
9372         if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
9373                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9374                 if (refcount_read(&clp->cl_count) == 1)
9375                         return;
9376
9377                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9378                         rpc_restart_call_prepare(task);
9379                         return;
9380                 }
9381         }
9382         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9383 }
9384
9385 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9386 {
9387         struct nfs4_sequence_data *calldata = data;
9388         struct nfs_client *clp = calldata->clp;
9389         struct nfs4_sequence_args *args;
9390         struct nfs4_sequence_res *res;
9391
9392         args = task->tk_msg.rpc_argp;
9393         res = task->tk_msg.rpc_resp;
9394
9395         nfs4_setup_sequence(clp, args, res, task);
9396 }
9397
9398 static const struct rpc_call_ops nfs41_sequence_ops = {
9399         .rpc_call_done = nfs41_sequence_call_done,
9400         .rpc_call_prepare = nfs41_sequence_prepare,
9401         .rpc_release = nfs41_sequence_release,
9402 };
9403
9404 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9405                 const struct cred *cred,
9406                 struct nfs4_slot *slot,
9407                 bool is_privileged)
9408 {
9409         struct nfs4_sequence_data *calldata;
9410         struct rpc_message msg = {
9411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9412                 .rpc_cred = cred,
9413         };
9414         struct rpc_task_setup task_setup_data = {
9415                 .rpc_client = clp->cl_rpcclient,
9416                 .rpc_message = &msg,
9417                 .callback_ops = &nfs41_sequence_ops,
9418                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9419         };
9420         struct rpc_task *ret;
9421
9422         ret = ERR_PTR(-EIO);
9423         if (!refcount_inc_not_zero(&clp->cl_count))
9424                 goto out_err;
9425
9426         ret = ERR_PTR(-ENOMEM);
9427         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9428         if (calldata == NULL)
9429                 goto out_put_clp;
9430         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9431         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9432         msg.rpc_argp = &calldata->args;
9433         msg.rpc_resp = &calldata->res;
9434         calldata->clp = clp;
9435         task_setup_data.callback_data = calldata;
9436
9437         ret = rpc_run_task(&task_setup_data);
9438         if (IS_ERR(ret))
9439                 goto out_err;
9440         return ret;
9441 out_put_clp:
9442         nfs_put_client(clp);
9443 out_err:
9444         nfs41_release_slot(slot);
9445         return ret;
9446 }
9447
9448 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9449 {
9450         struct rpc_task *task;
9451         int ret = 0;
9452
9453         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9454                 return -EAGAIN;
9455         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9456         if (IS_ERR(task))
9457                 ret = PTR_ERR(task);
9458         else
9459                 rpc_put_task_async(task);
9460         dprintk("<-- %s status=%d\n", __func__, ret);
9461         return ret;
9462 }
9463
9464 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9465 {
9466         struct rpc_task *task;
9467         int ret;
9468
9469         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9470         if (IS_ERR(task)) {
9471                 ret = PTR_ERR(task);
9472                 goto out;
9473         }
9474         ret = rpc_wait_for_completion_task(task);
9475         if (!ret)
9476                 ret = task->tk_status;
9477         rpc_put_task(task);
9478 out:
9479         dprintk("<-- %s status=%d\n", __func__, ret);
9480         return ret;
9481 }
9482
9483 struct nfs4_reclaim_complete_data {
9484         struct nfs_client *clp;
9485         struct nfs41_reclaim_complete_args arg;
9486         struct nfs41_reclaim_complete_res res;
9487 };
9488
9489 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9490 {
9491         struct nfs4_reclaim_complete_data *calldata = data;
9492
9493         nfs4_setup_sequence(calldata->clp,
9494                         &calldata->arg.seq_args,
9495                         &calldata->res.seq_res,
9496                         task);
9497 }
9498
9499 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9500 {
9501         switch(task->tk_status) {
9502         case 0:
9503                 wake_up_all(&clp->cl_lock_waitq);
9504                 fallthrough;
9505         case -NFS4ERR_COMPLETE_ALREADY:
9506         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9507                 break;
9508         case -NFS4ERR_DELAY:
9509                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9510                 fallthrough;
9511         case -NFS4ERR_RETRY_UNCACHED_REP:
9512         case -EACCES:
9513                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9514                         __func__, task->tk_status, clp->cl_hostname);
9515                 return -EAGAIN;
9516         case -NFS4ERR_BADSESSION:
9517         case -NFS4ERR_DEADSESSION:
9518         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9519                 break;
9520         default:
9521                 nfs4_schedule_lease_recovery(clp);
9522         }
9523         return 0;
9524 }
9525
9526 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9527 {
9528         struct nfs4_reclaim_complete_data *calldata = data;
9529         struct nfs_client *clp = calldata->clp;
9530         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9531
9532         if (!nfs41_sequence_done(task, res))
9533                 return;
9534
9535         trace_nfs4_reclaim_complete(clp, task->tk_status);
9536         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9537                 rpc_restart_call_prepare(task);
9538                 return;
9539         }
9540 }
9541
9542 static void nfs4_free_reclaim_complete_data(void *data)
9543 {
9544         struct nfs4_reclaim_complete_data *calldata = data;
9545
9546         kfree(calldata);
9547 }
9548
9549 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9550         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9551         .rpc_call_done = nfs4_reclaim_complete_done,
9552         .rpc_release = nfs4_free_reclaim_complete_data,
9553 };
9554
9555 /*
9556  * Issue a global reclaim complete.
9557  */
9558 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9559                 const struct cred *cred)
9560 {
9561         struct nfs4_reclaim_complete_data *calldata;
9562         struct rpc_message msg = {
9563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9564                 .rpc_cred = cred,
9565         };
9566         struct rpc_task_setup task_setup_data = {
9567                 .rpc_client = clp->cl_rpcclient,
9568                 .rpc_message = &msg,
9569                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9570                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9571         };
9572         int status = -ENOMEM;
9573
9574         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9575         if (calldata == NULL)
9576                 goto out;
9577         calldata->clp = clp;
9578         calldata->arg.one_fs = 0;
9579
9580         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9581         msg.rpc_argp = &calldata->arg;
9582         msg.rpc_resp = &calldata->res;
9583         task_setup_data.callback_data = calldata;
9584         status = nfs4_call_sync_custom(&task_setup_data);
9585 out:
9586         dprintk("<-- %s status=%d\n", __func__, status);
9587         return status;
9588 }
9589
9590 static void
9591 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9592 {
9593         struct nfs4_layoutget *lgp = calldata;
9594         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9595
9596         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9597                                 &lgp->res.seq_res, task);
9598 }
9599
9600 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9601 {
9602         struct nfs4_layoutget *lgp = calldata;
9603
9604         nfs41_sequence_process(task, &lgp->res.seq_res);
9605 }
9606
9607 static int
9608 nfs4_layoutget_handle_exception(struct rpc_task *task,
9609                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9610 {
9611         struct inode *inode = lgp->args.inode;
9612         struct nfs_server *server = NFS_SERVER(inode);
9613         struct pnfs_layout_hdr *lo = lgp->lo;
9614         int nfs4err = task->tk_status;
9615         int err, status = 0;
9616         LIST_HEAD(head);
9617
9618         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9619
9620         nfs4_sequence_free_slot(&lgp->res.seq_res);
9621
9622         switch (nfs4err) {
9623         case 0:
9624                 goto out;
9625
9626         /*
9627          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9628          * on the file. set tk_status to -ENODATA to tell upper layer to
9629          * retry go inband.
9630          */
9631         case -NFS4ERR_LAYOUTUNAVAILABLE:
9632                 status = -ENODATA;
9633                 goto out;
9634         /*
9635          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9636          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9637          */
9638         case -NFS4ERR_BADLAYOUT:
9639                 status = -EOVERFLOW;
9640                 goto out;
9641         /*
9642          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9643          * (or clients) writing to the same RAID stripe except when
9644          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9645          *
9646          * Treat it like we would RECALLCONFLICT -- we retry for a little
9647          * while, and then eventually give up.
9648          */
9649         case -NFS4ERR_LAYOUTTRYLATER:
9650                 if (lgp->args.minlength == 0) {
9651                         status = -EOVERFLOW;
9652                         goto out;
9653                 }
9654                 status = -EBUSY;
9655                 break;
9656         case -NFS4ERR_RECALLCONFLICT:
9657                 status = -ERECALLCONFLICT;
9658                 break;
9659         case -NFS4ERR_DELEG_REVOKED:
9660         case -NFS4ERR_ADMIN_REVOKED:
9661         case -NFS4ERR_EXPIRED:
9662         case -NFS4ERR_BAD_STATEID:
9663                 exception->timeout = 0;
9664                 spin_lock(&inode->i_lock);
9665                 /* If the open stateid was bad, then recover it. */
9666                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9667                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9668                         spin_unlock(&inode->i_lock);
9669                         exception->state = lgp->args.ctx->state;
9670                         exception->stateid = &lgp->args.stateid;
9671                         break;
9672                 }
9673
9674                 /*
9675                  * Mark the bad layout state as invalid, then retry
9676                  */
9677                 pnfs_mark_layout_stateid_invalid(lo, &head);
9678                 spin_unlock(&inode->i_lock);
9679                 nfs_commit_inode(inode, 0);
9680                 pnfs_free_lseg_list(&head);
9681                 status = -EAGAIN;
9682                 goto out;
9683         }
9684
9685         err = nfs4_handle_exception(server, nfs4err, exception);
9686         if (!status) {
9687                 if (exception->retry)
9688                         status = -EAGAIN;
9689                 else
9690                         status = err;
9691         }
9692 out:
9693         return status;
9694 }
9695
9696 size_t max_response_pages(struct nfs_server *server)
9697 {
9698         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9699         return nfs_page_array_len(0, max_resp_sz);
9700 }
9701
9702 static void nfs4_layoutget_release(void *calldata)
9703 {
9704         struct nfs4_layoutget *lgp = calldata;
9705
9706         nfs4_sequence_free_slot(&lgp->res.seq_res);
9707         pnfs_layoutget_free(lgp);
9708 }
9709
9710 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9711         .rpc_call_prepare = nfs4_layoutget_prepare,
9712         .rpc_call_done = nfs4_layoutget_done,
9713         .rpc_release = nfs4_layoutget_release,
9714 };
9715
9716 struct pnfs_layout_segment *
9717 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9718 {
9719         struct inode *inode = lgp->args.inode;
9720         struct nfs_server *server = NFS_SERVER(inode);
9721         struct rpc_task *task;
9722         struct rpc_message msg = {
9723                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9724                 .rpc_argp = &lgp->args,
9725                 .rpc_resp = &lgp->res,
9726                 .rpc_cred = lgp->cred,
9727         };
9728         struct rpc_task_setup task_setup_data = {
9729                 .rpc_client = server->client,
9730                 .rpc_message = &msg,
9731                 .callback_ops = &nfs4_layoutget_call_ops,
9732                 .callback_data = lgp,
9733                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9734                          RPC_TASK_MOVEABLE,
9735         };
9736         struct pnfs_layout_segment *lseg = NULL;
9737         struct nfs4_exception exception = {
9738                 .inode = inode,
9739                 .timeout = *timeout,
9740         };
9741         int status = 0;
9742
9743         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9744
9745         task = rpc_run_task(&task_setup_data);
9746         if (IS_ERR(task))
9747                 return ERR_CAST(task);
9748
9749         status = rpc_wait_for_completion_task(task);
9750         if (status != 0)
9751                 goto out;
9752
9753         if (task->tk_status < 0) {
9754                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9755                 *timeout = exception.timeout;
9756         } else if (lgp->res.layoutp->len == 0) {
9757                 status = -EAGAIN;
9758                 *timeout = nfs4_update_delay(&exception.timeout);
9759         } else
9760                 lseg = pnfs_layout_process(lgp);
9761 out:
9762         trace_nfs4_layoutget(lgp->args.ctx,
9763                         &lgp->args.range,
9764                         &lgp->res.range,
9765                         &lgp->res.stateid,
9766                         status);
9767
9768         rpc_put_task(task);
9769         dprintk("<-- %s status=%d\n", __func__, status);
9770         if (status)
9771                 return ERR_PTR(status);
9772         return lseg;
9773 }
9774
9775 static void
9776 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9777 {
9778         struct nfs4_layoutreturn *lrp = calldata;
9779
9780         nfs4_setup_sequence(lrp->clp,
9781                         &lrp->args.seq_args,
9782                         &lrp->res.seq_res,
9783                         task);
9784         if (!pnfs_layout_is_valid(lrp->args.layout))
9785                 rpc_exit(task, 0);
9786 }
9787
9788 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9789 {
9790         struct nfs4_layoutreturn *lrp = calldata;
9791         struct nfs_server *server;
9792
9793         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9794                 return;
9795
9796         /*
9797          * Was there an RPC level error? Assume the call succeeded,
9798          * and that we need to release the layout
9799          */
9800         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9801                 lrp->res.lrs_present = 0;
9802                 return;
9803         }
9804
9805         server = NFS_SERVER(lrp->args.inode);
9806         switch (task->tk_status) {
9807         case -NFS4ERR_OLD_STATEID:
9808                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9809                                         &lrp->args.range,
9810                                         lrp->args.inode))
9811                         goto out_restart;
9812                 fallthrough;
9813         default:
9814                 task->tk_status = 0;
9815                 fallthrough;
9816         case 0:
9817                 break;
9818         case -NFS4ERR_DELAY:
9819                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9820                         break;
9821                 goto out_restart;
9822         }
9823         return;
9824 out_restart:
9825         task->tk_status = 0;
9826         nfs4_sequence_free_slot(&lrp->res.seq_res);
9827         rpc_restart_call_prepare(task);
9828 }
9829
9830 static void nfs4_layoutreturn_release(void *calldata)
9831 {
9832         struct nfs4_layoutreturn *lrp = calldata;
9833         struct pnfs_layout_hdr *lo = lrp->args.layout;
9834
9835         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9836                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9837         nfs4_sequence_free_slot(&lrp->res.seq_res);
9838         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9839                 lrp->ld_private.ops->free(&lrp->ld_private);
9840         pnfs_put_layout_hdr(lrp->args.layout);
9841         nfs_iput_and_deactive(lrp->inode);
9842         put_cred(lrp->cred);
9843         kfree(calldata);
9844 }
9845
9846 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9847         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9848         .rpc_call_done = nfs4_layoutreturn_done,
9849         .rpc_release = nfs4_layoutreturn_release,
9850 };
9851
9852 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9853 {
9854         struct rpc_task *task;
9855         struct rpc_message msg = {
9856                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9857                 .rpc_argp = &lrp->args,
9858                 .rpc_resp = &lrp->res,
9859                 .rpc_cred = lrp->cred,
9860         };
9861         struct rpc_task_setup task_setup_data = {
9862                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9863                 .rpc_message = &msg,
9864                 .callback_ops = &nfs4_layoutreturn_call_ops,
9865                 .callback_data = lrp,
9866                 .flags = RPC_TASK_MOVEABLE,
9867         };
9868         int status = 0;
9869
9870         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9871                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9872                         &task_setup_data.rpc_client, &msg);
9873
9874         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9875         if (!sync) {
9876                 if (!lrp->inode) {
9877                         nfs4_layoutreturn_release(lrp);
9878                         return -EAGAIN;
9879                 }
9880                 task_setup_data.flags |= RPC_TASK_ASYNC;
9881         }
9882         if (!lrp->inode)
9883                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9884                                    1);
9885         else
9886                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9887                                    0);
9888         task = rpc_run_task(&task_setup_data);
9889         if (IS_ERR(task))
9890                 return PTR_ERR(task);
9891         if (sync)
9892                 status = task->tk_status;
9893         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9894         dprintk("<-- %s status=%d\n", __func__, status);
9895         rpc_put_task(task);
9896         return status;
9897 }
9898
9899 static int
9900 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9901                 struct pnfs_device *pdev,
9902                 const struct cred *cred)
9903 {
9904         struct nfs4_getdeviceinfo_args args = {
9905                 .pdev = pdev,
9906                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9907                         NOTIFY_DEVICEID4_DELETE,
9908         };
9909         struct nfs4_getdeviceinfo_res res = {
9910                 .pdev = pdev,
9911         };
9912         struct rpc_message msg = {
9913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9914                 .rpc_argp = &args,
9915                 .rpc_resp = &res,
9916                 .rpc_cred = cred,
9917         };
9918         int status;
9919
9920         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9921         if (res.notification & ~args.notify_types)
9922                 dprintk("%s: unsupported notification\n", __func__);
9923         if (res.notification != args.notify_types)
9924                 pdev->nocache = 1;
9925
9926         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9927
9928         dprintk("<-- %s status=%d\n", __func__, status);
9929
9930         return status;
9931 }
9932
9933 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9934                 struct pnfs_device *pdev,
9935                 const struct cred *cred)
9936 {
9937         struct nfs4_exception exception = { };
9938         int err;
9939
9940         do {
9941                 err = nfs4_handle_exception(server,
9942                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9943                                         &exception);
9944         } while (exception.retry);
9945         return err;
9946 }
9947 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9948
9949 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9950 {
9951         struct nfs4_layoutcommit_data *data = calldata;
9952         struct nfs_server *server = NFS_SERVER(data->args.inode);
9953
9954         nfs4_setup_sequence(server->nfs_client,
9955                         &data->args.seq_args,
9956                         &data->res.seq_res,
9957                         task);
9958 }
9959
9960 static void
9961 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9962 {
9963         struct nfs4_layoutcommit_data *data = calldata;
9964         struct nfs_server *server = NFS_SERVER(data->args.inode);
9965
9966         if (!nfs41_sequence_done(task, &data->res.seq_res))
9967                 return;
9968
9969         switch (task->tk_status) { /* Just ignore these failures */
9970         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9971         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9972         case -NFS4ERR_BADLAYOUT:     /* no layout */
9973         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9974                 task->tk_status = 0;
9975                 break;
9976         case 0:
9977                 break;
9978         default:
9979                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9980                         rpc_restart_call_prepare(task);
9981                         return;
9982                 }
9983         }
9984 }
9985
9986 static void nfs4_layoutcommit_release(void *calldata)
9987 {
9988         struct nfs4_layoutcommit_data *data = calldata;
9989
9990         pnfs_cleanup_layoutcommit(data);
9991         nfs_post_op_update_inode_force_wcc(data->args.inode,
9992                                            data->res.fattr);
9993         put_cred(data->cred);
9994         nfs_iput_and_deactive(data->inode);
9995         kfree(data);
9996 }
9997
9998 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9999         .rpc_call_prepare = nfs4_layoutcommit_prepare,
10000         .rpc_call_done = nfs4_layoutcommit_done,
10001         .rpc_release = nfs4_layoutcommit_release,
10002 };
10003
10004 int
10005 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10006 {
10007         struct rpc_message msg = {
10008                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10009                 .rpc_argp = &data->args,
10010                 .rpc_resp = &data->res,
10011                 .rpc_cred = data->cred,
10012         };
10013         struct rpc_task_setup task_setup_data = {
10014                 .task = &data->task,
10015                 .rpc_client = NFS_CLIENT(data->args.inode),
10016                 .rpc_message = &msg,
10017                 .callback_ops = &nfs4_layoutcommit_ops,
10018                 .callback_data = data,
10019                 .flags = RPC_TASK_MOVEABLE,
10020         };
10021         struct rpc_task *task;
10022         int status = 0;
10023
10024         dprintk("NFS: initiating layoutcommit call. sync %d "
10025                 "lbw: %llu inode %lu\n", sync,
10026                 data->args.lastbytewritten,
10027                 data->args.inode->i_ino);
10028
10029         if (!sync) {
10030                 data->inode = nfs_igrab_and_active(data->args.inode);
10031                 if (data->inode == NULL) {
10032                         nfs4_layoutcommit_release(data);
10033                         return -EAGAIN;
10034                 }
10035                 task_setup_data.flags = RPC_TASK_ASYNC;
10036         }
10037         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10038         task = rpc_run_task(&task_setup_data);
10039         if (IS_ERR(task))
10040                 return PTR_ERR(task);
10041         if (sync)
10042                 status = task->tk_status;
10043         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10044         dprintk("%s: status %d\n", __func__, status);
10045         rpc_put_task(task);
10046         return status;
10047 }
10048
10049 /*
10050  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10051  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10052  */
10053 static int
10054 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10055                     struct nfs_fsinfo *info,
10056                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10057 {
10058         struct nfs41_secinfo_no_name_args args = {
10059                 .style = SECINFO_STYLE_CURRENT_FH,
10060         };
10061         struct nfs4_secinfo_res res = {
10062                 .flavors = flavors,
10063         };
10064         struct rpc_message msg = {
10065                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10066                 .rpc_argp = &args,
10067                 .rpc_resp = &res,
10068         };
10069         struct nfs4_call_sync_data data = {
10070                 .seq_server = server,
10071                 .seq_args = &args.seq_args,
10072                 .seq_res = &res.seq_res,
10073         };
10074         struct rpc_task_setup task_setup = {
10075                 .rpc_client = server->client,
10076                 .rpc_message = &msg,
10077                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10078                 .callback_data = &data,
10079                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10080         };
10081         const struct cred *cred = NULL;
10082         int status;
10083
10084         if (use_integrity) {
10085                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10086
10087                 cred = nfs4_get_clid_cred(server->nfs_client);
10088                 msg.rpc_cred = cred;
10089         }
10090
10091         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10092         status = nfs4_call_sync_custom(&task_setup);
10093         dprintk("<-- %s status=%d\n", __func__, status);
10094
10095         put_cred(cred);
10096
10097         return status;
10098 }
10099
10100 static int
10101 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10102                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10103 {
10104         struct nfs4_exception exception = {
10105                 .interruptible = true,
10106         };
10107         int err;
10108         do {
10109                 /* first try using integrity protection */
10110                 err = -NFS4ERR_WRONGSEC;
10111
10112                 /* try to use integrity protection with machine cred */
10113                 if (_nfs4_is_integrity_protected(server->nfs_client))
10114                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10115                                                           flavors, true);
10116
10117                 /*
10118                  * if unable to use integrity protection, or SECINFO with
10119                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10120                  * disallowed by spec, but exists in deployed servers) use
10121                  * the current filesystem's rpc_client and the user cred.
10122                  */
10123                 if (err == -NFS4ERR_WRONGSEC)
10124                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10125                                                           flavors, false);
10126
10127                 switch (err) {
10128                 case 0:
10129                 case -NFS4ERR_WRONGSEC:
10130                 case -ENOTSUPP:
10131                         goto out;
10132                 default:
10133                         err = nfs4_handle_exception(server, err, &exception);
10134                 }
10135         } while (exception.retry);
10136 out:
10137         return err;
10138 }
10139
10140 static int
10141 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10142                     struct nfs_fsinfo *info)
10143 {
10144         int err;
10145         struct page *page;
10146         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10147         struct nfs4_secinfo_flavors *flavors;
10148         struct nfs4_secinfo4 *secinfo;
10149         int i;
10150
10151         page = alloc_page(GFP_KERNEL);
10152         if (!page) {
10153                 err = -ENOMEM;
10154                 goto out;
10155         }
10156
10157         flavors = page_address(page);
10158         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10159
10160         /*
10161          * Fall back on "guess and check" method if
10162          * the server doesn't support SECINFO_NO_NAME
10163          */
10164         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10165                 err = nfs4_find_root_sec(server, fhandle, info);
10166                 goto out_freepage;
10167         }
10168         if (err)
10169                 goto out_freepage;
10170
10171         for (i = 0; i < flavors->num_flavors; i++) {
10172                 secinfo = &flavors->flavors[i];
10173
10174                 switch (secinfo->flavor) {
10175                 case RPC_AUTH_NULL:
10176                 case RPC_AUTH_UNIX:
10177                 case RPC_AUTH_GSS:
10178                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10179                                         &secinfo->flavor_info);
10180                         break;
10181                 default:
10182                         flavor = RPC_AUTH_MAXFLAVOR;
10183                         break;
10184                 }
10185
10186                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10187                         flavor = RPC_AUTH_MAXFLAVOR;
10188
10189                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10190                         err = nfs4_lookup_root_sec(server, fhandle,
10191                                                    info, flavor);
10192                         if (!err)
10193                                 break;
10194                 }
10195         }
10196
10197         if (flavor == RPC_AUTH_MAXFLAVOR)
10198                 err = -EPERM;
10199
10200 out_freepage:
10201         put_page(page);
10202         if (err == -EACCES)
10203                 return -EPERM;
10204 out:
10205         return err;
10206 }
10207
10208 static int _nfs41_test_stateid(struct nfs_server *server,
10209                 nfs4_stateid *stateid,
10210                 const struct cred *cred)
10211 {
10212         int status;
10213         struct nfs41_test_stateid_args args = {
10214                 .stateid = stateid,
10215         };
10216         struct nfs41_test_stateid_res res;
10217         struct rpc_message msg = {
10218                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10219                 .rpc_argp = &args,
10220                 .rpc_resp = &res,
10221                 .rpc_cred = cred,
10222         };
10223         struct rpc_clnt *rpc_client = server->client;
10224
10225         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10226                 &rpc_client, &msg);
10227
10228         dprintk("NFS call  test_stateid %p\n", stateid);
10229         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10230         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10231                         &args.seq_args, &res.seq_res);
10232         if (status != NFS_OK) {
10233                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10234                 return status;
10235         }
10236         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10237         return -res.status;
10238 }
10239
10240 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10241                 int err, struct nfs4_exception *exception)
10242 {
10243         exception->retry = 0;
10244         switch(err) {
10245         case -NFS4ERR_DELAY:
10246         case -NFS4ERR_RETRY_UNCACHED_REP:
10247                 nfs4_handle_exception(server, err, exception);
10248                 break;
10249         case -NFS4ERR_BADSESSION:
10250         case -NFS4ERR_BADSLOT:
10251         case -NFS4ERR_BAD_HIGH_SLOT:
10252         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10253         case -NFS4ERR_DEADSESSION:
10254                 nfs4_do_handle_exception(server, err, exception);
10255         }
10256 }
10257
10258 /**
10259  * nfs41_test_stateid - perform a TEST_STATEID operation
10260  *
10261  * @server: server / transport on which to perform the operation
10262  * @stateid: state ID to test
10263  * @cred: credential
10264  *
10265  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10266  * Otherwise a negative NFS4ERR value is returned if the operation
10267  * failed or the state ID is not currently valid.
10268  */
10269 static int nfs41_test_stateid(struct nfs_server *server,
10270                 nfs4_stateid *stateid,
10271                 const struct cred *cred)
10272 {
10273         struct nfs4_exception exception = {
10274                 .interruptible = true,
10275         };
10276         int err;
10277         do {
10278                 err = _nfs41_test_stateid(server, stateid, cred);
10279                 nfs4_handle_delay_or_session_error(server, err, &exception);
10280         } while (exception.retry);
10281         return err;
10282 }
10283
10284 struct nfs_free_stateid_data {
10285         struct nfs_server *server;
10286         struct nfs41_free_stateid_args args;
10287         struct nfs41_free_stateid_res res;
10288 };
10289
10290 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10291 {
10292         struct nfs_free_stateid_data *data = calldata;
10293         nfs4_setup_sequence(data->server->nfs_client,
10294                         &data->args.seq_args,
10295                         &data->res.seq_res,
10296                         task);
10297 }
10298
10299 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10300 {
10301         struct nfs_free_stateid_data *data = calldata;
10302
10303         nfs41_sequence_done(task, &data->res.seq_res);
10304
10305         switch (task->tk_status) {
10306         case -NFS4ERR_DELAY:
10307                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10308                         rpc_restart_call_prepare(task);
10309         }
10310 }
10311
10312 static void nfs41_free_stateid_release(void *calldata)
10313 {
10314         struct nfs_free_stateid_data *data = calldata;
10315         struct nfs_client *clp = data->server->nfs_client;
10316
10317         nfs_put_client(clp);
10318         kfree(calldata);
10319 }
10320
10321 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10322         .rpc_call_prepare = nfs41_free_stateid_prepare,
10323         .rpc_call_done = nfs41_free_stateid_done,
10324         .rpc_release = nfs41_free_stateid_release,
10325 };
10326
10327 /**
10328  * nfs41_free_stateid - perform a FREE_STATEID operation
10329  *
10330  * @server: server / transport on which to perform the operation
10331  * @stateid: state ID to release
10332  * @cred: credential
10333  * @privileged: set to true if this call needs to be privileged
10334  *
10335  * Note: this function is always asynchronous.
10336  */
10337 static int nfs41_free_stateid(struct nfs_server *server,
10338                 const nfs4_stateid *stateid,
10339                 const struct cred *cred,
10340                 bool privileged)
10341 {
10342         struct rpc_message msg = {
10343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10344                 .rpc_cred = cred,
10345         };
10346         struct rpc_task_setup task_setup = {
10347                 .rpc_client = server->client,
10348                 .rpc_message = &msg,
10349                 .callback_ops = &nfs41_free_stateid_ops,
10350                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10351         };
10352         struct nfs_free_stateid_data *data;
10353         struct rpc_task *task;
10354         struct nfs_client *clp = server->nfs_client;
10355
10356         if (!refcount_inc_not_zero(&clp->cl_count))
10357                 return -EIO;
10358
10359         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10360                 &task_setup.rpc_client, &msg);
10361
10362         dprintk("NFS call  free_stateid %p\n", stateid);
10363         data = kmalloc(sizeof(*data), GFP_KERNEL);
10364         if (!data)
10365                 return -ENOMEM;
10366         data->server = server;
10367         nfs4_stateid_copy(&data->args.stateid, stateid);
10368
10369         task_setup.callback_data = data;
10370
10371         msg.rpc_argp = &data->args;
10372         msg.rpc_resp = &data->res;
10373         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10374         task = rpc_run_task(&task_setup);
10375         if (IS_ERR(task))
10376                 return PTR_ERR(task);
10377         rpc_put_task(task);
10378         return 0;
10379 }
10380
10381 static void
10382 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10383 {
10384         const struct cred *cred = lsp->ls_state->owner->so_cred;
10385
10386         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10387         nfs4_free_lock_state(server, lsp);
10388 }
10389
10390 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10391                 const nfs4_stateid *s2)
10392 {
10393         if (s1->type != s2->type)
10394                 return false;
10395
10396         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10397                 return false;
10398
10399         if (s1->seqid == s2->seqid)
10400                 return true;
10401
10402         return s1->seqid == 0 || s2->seqid == 0;
10403 }
10404
10405 #endif /* CONFIG_NFS_V4_1 */
10406
10407 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10408                 const nfs4_stateid *s2)
10409 {
10410         return nfs4_stateid_match(s1, s2);
10411 }
10412
10413
10414 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10415         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10416         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10417         .recover_open   = nfs4_open_reclaim,
10418         .recover_lock   = nfs4_lock_reclaim,
10419         .establish_clid = nfs4_init_clientid,
10420         .detect_trunking = nfs40_discover_server_trunking,
10421 };
10422
10423 #if defined(CONFIG_NFS_V4_1)
10424 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10425         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10426         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10427         .recover_open   = nfs4_open_reclaim,
10428         .recover_lock   = nfs4_lock_reclaim,
10429         .establish_clid = nfs41_init_clientid,
10430         .reclaim_complete = nfs41_proc_reclaim_complete,
10431         .detect_trunking = nfs41_discover_server_trunking,
10432 };
10433 #endif /* CONFIG_NFS_V4_1 */
10434
10435 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10436         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10437         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10438         .recover_open   = nfs40_open_expired,
10439         .recover_lock   = nfs4_lock_expired,
10440         .establish_clid = nfs4_init_clientid,
10441 };
10442
10443 #if defined(CONFIG_NFS_V4_1)
10444 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10445         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10446         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10447         .recover_open   = nfs41_open_expired,
10448         .recover_lock   = nfs41_lock_expired,
10449         .establish_clid = nfs41_init_clientid,
10450 };
10451 #endif /* CONFIG_NFS_V4_1 */
10452
10453 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10454         .sched_state_renewal = nfs4_proc_async_renew,
10455         .get_state_renewal_cred = nfs4_get_renew_cred,
10456         .renew_lease = nfs4_proc_renew,
10457 };
10458
10459 #if defined(CONFIG_NFS_V4_1)
10460 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10461         .sched_state_renewal = nfs41_proc_async_sequence,
10462         .get_state_renewal_cred = nfs4_get_machine_cred,
10463         .renew_lease = nfs4_proc_sequence,
10464 };
10465 #endif
10466
10467 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10468         .get_locations = _nfs40_proc_get_locations,
10469         .fsid_present = _nfs40_proc_fsid_present,
10470 };
10471
10472 #if defined(CONFIG_NFS_V4_1)
10473 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10474         .get_locations = _nfs41_proc_get_locations,
10475         .fsid_present = _nfs41_proc_fsid_present,
10476 };
10477 #endif  /* CONFIG_NFS_V4_1 */
10478
10479 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10480         .minor_version = 0,
10481         .init_caps = NFS_CAP_READDIRPLUS
10482                 | NFS_CAP_ATOMIC_OPEN
10483                 | NFS_CAP_POSIX_LOCK,
10484         .init_client = nfs40_init_client,
10485         .shutdown_client = nfs40_shutdown_client,
10486         .match_stateid = nfs4_match_stateid,
10487         .find_root_sec = nfs4_find_root_sec,
10488         .free_lock_state = nfs4_release_lockowner,
10489         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10490         .alloc_seqid = nfs_alloc_seqid,
10491         .call_sync_ops = &nfs40_call_sync_ops,
10492         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10493         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10494         .state_renewal_ops = &nfs40_state_renewal_ops,
10495         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10496 };
10497
10498 #if defined(CONFIG_NFS_V4_1)
10499 static struct nfs_seqid *
10500 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10501 {
10502         return NULL;
10503 }
10504
10505 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10506         .minor_version = 1,
10507         .init_caps = NFS_CAP_READDIRPLUS
10508                 | NFS_CAP_ATOMIC_OPEN
10509                 | NFS_CAP_POSIX_LOCK
10510                 | NFS_CAP_STATEID_NFSV41
10511                 | NFS_CAP_ATOMIC_OPEN_V1
10512                 | NFS_CAP_LGOPEN
10513                 | NFS_CAP_MOVEABLE,
10514         .init_client = nfs41_init_client,
10515         .shutdown_client = nfs41_shutdown_client,
10516         .match_stateid = nfs41_match_stateid,
10517         .find_root_sec = nfs41_find_root_sec,
10518         .free_lock_state = nfs41_free_lock_state,
10519         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10520         .alloc_seqid = nfs_alloc_no_seqid,
10521         .session_trunk = nfs4_test_session_trunk,
10522         .call_sync_ops = &nfs41_call_sync_ops,
10523         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10524         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10525         .state_renewal_ops = &nfs41_state_renewal_ops,
10526         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10527 };
10528 #endif
10529
10530 #if defined(CONFIG_NFS_V4_2)
10531 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10532         .minor_version = 2,
10533         .init_caps = NFS_CAP_READDIRPLUS
10534                 | NFS_CAP_ATOMIC_OPEN
10535                 | NFS_CAP_POSIX_LOCK
10536                 | NFS_CAP_STATEID_NFSV41
10537                 | NFS_CAP_ATOMIC_OPEN_V1
10538                 | NFS_CAP_LGOPEN
10539                 | NFS_CAP_ALLOCATE
10540                 | NFS_CAP_COPY
10541                 | NFS_CAP_OFFLOAD_CANCEL
10542                 | NFS_CAP_COPY_NOTIFY
10543                 | NFS_CAP_DEALLOCATE
10544                 | NFS_CAP_SEEK
10545                 | NFS_CAP_LAYOUTSTATS
10546                 | NFS_CAP_CLONE
10547                 | NFS_CAP_LAYOUTERROR
10548                 | NFS_CAP_READ_PLUS
10549                 | NFS_CAP_MOVEABLE,
10550         .init_client = nfs41_init_client,
10551         .shutdown_client = nfs41_shutdown_client,
10552         .match_stateid = nfs41_match_stateid,
10553         .find_root_sec = nfs41_find_root_sec,
10554         .free_lock_state = nfs41_free_lock_state,
10555         .call_sync_ops = &nfs41_call_sync_ops,
10556         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10557         .alloc_seqid = nfs_alloc_no_seqid,
10558         .session_trunk = nfs4_test_session_trunk,
10559         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10560         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10561         .state_renewal_ops = &nfs41_state_renewal_ops,
10562         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10563 };
10564 #endif
10565
10566 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10567         [0] = &nfs_v4_0_minor_ops,
10568 #if defined(CONFIG_NFS_V4_1)
10569         [1] = &nfs_v4_1_minor_ops,
10570 #endif
10571 #if defined(CONFIG_NFS_V4_2)
10572         [2] = &nfs_v4_2_minor_ops,
10573 #endif
10574 };
10575
10576 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10577 {
10578         ssize_t error, error2, error3;
10579
10580         error = generic_listxattr(dentry, list, size);
10581         if (error < 0)
10582                 return error;
10583         if (list) {
10584                 list += error;
10585                 size -= error;
10586         }
10587
10588         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10589         if (error2 < 0)
10590                 return error2;
10591
10592         if (list) {
10593                 list += error2;
10594                 size -= error2;
10595         }
10596
10597         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10598         if (error3 < 0)
10599                 return error3;
10600
10601         return error + error2 + error3;
10602 }
10603
10604 static void nfs4_enable_swap(struct inode *inode)
10605 {
10606         /* The state manager thread must always be running.
10607          * It will notice the client is a swapper, and stay put.
10608          */
10609         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10610
10611         nfs4_schedule_state_manager(clp);
10612 }
10613
10614 static void nfs4_disable_swap(struct inode *inode)
10615 {
10616         /* The state manager thread will now exit once it is
10617          * woken.
10618          */
10619         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10620
10621         nfs4_schedule_state_manager(clp);
10622 }
10623
10624 static const struct inode_operations nfs4_dir_inode_operations = {
10625         .create         = nfs_create,
10626         .lookup         = nfs_lookup,
10627         .atomic_open    = nfs_atomic_open,
10628         .link           = nfs_link,
10629         .unlink         = nfs_unlink,
10630         .symlink        = nfs_symlink,
10631         .mkdir          = nfs_mkdir,
10632         .rmdir          = nfs_rmdir,
10633         .mknod          = nfs_mknod,
10634         .rename         = nfs_rename,
10635         .permission     = nfs_permission,
10636         .getattr        = nfs_getattr,
10637         .setattr        = nfs_setattr,
10638         .listxattr      = nfs4_listxattr,
10639 };
10640
10641 static const struct inode_operations nfs4_file_inode_operations = {
10642         .permission     = nfs_permission,
10643         .getattr        = nfs_getattr,
10644         .setattr        = nfs_setattr,
10645         .listxattr      = nfs4_listxattr,
10646 };
10647
10648 const struct nfs_rpc_ops nfs_v4_clientops = {
10649         .version        = 4,                    /* protocol version */
10650         .dentry_ops     = &nfs4_dentry_operations,
10651         .dir_inode_ops  = &nfs4_dir_inode_operations,
10652         .file_inode_ops = &nfs4_file_inode_operations,
10653         .file_ops       = &nfs4_file_operations,
10654         .getroot        = nfs4_proc_get_root,
10655         .submount       = nfs4_submount,
10656         .try_get_tree   = nfs4_try_get_tree,
10657         .getattr        = nfs4_proc_getattr,
10658         .setattr        = nfs4_proc_setattr,
10659         .lookup         = nfs4_proc_lookup,
10660         .lookupp        = nfs4_proc_lookupp,
10661         .access         = nfs4_proc_access,
10662         .readlink       = nfs4_proc_readlink,
10663         .create         = nfs4_proc_create,
10664         .remove         = nfs4_proc_remove,
10665         .unlink_setup   = nfs4_proc_unlink_setup,
10666         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10667         .unlink_done    = nfs4_proc_unlink_done,
10668         .rename_setup   = nfs4_proc_rename_setup,
10669         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10670         .rename_done    = nfs4_proc_rename_done,
10671         .link           = nfs4_proc_link,
10672         .symlink        = nfs4_proc_symlink,
10673         .mkdir          = nfs4_proc_mkdir,
10674         .rmdir          = nfs4_proc_rmdir,
10675         .readdir        = nfs4_proc_readdir,
10676         .mknod          = nfs4_proc_mknod,
10677         .statfs         = nfs4_proc_statfs,
10678         .fsinfo         = nfs4_proc_fsinfo,
10679         .pathconf       = nfs4_proc_pathconf,
10680         .set_capabilities = nfs4_server_capabilities,
10681         .decode_dirent  = nfs4_decode_dirent,
10682         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10683         .read_setup     = nfs4_proc_read_setup,
10684         .read_done      = nfs4_read_done,
10685         .write_setup    = nfs4_proc_write_setup,
10686         .write_done     = nfs4_write_done,
10687         .commit_setup   = nfs4_proc_commit_setup,
10688         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10689         .commit_done    = nfs4_commit_done,
10690         .lock           = nfs4_proc_lock,
10691         .clear_acl_cache = nfs4_zap_acl_attr,
10692         .close_context  = nfs4_close_context,
10693         .open_context   = nfs4_atomic_open,
10694         .have_delegation = nfs4_have_delegation,
10695         .alloc_client   = nfs4_alloc_client,
10696         .init_client    = nfs4_init_client,
10697         .free_client    = nfs4_free_client,
10698         .create_server  = nfs4_create_server,
10699         .clone_server   = nfs_clone_server,
10700         .discover_trunking = nfs4_discover_trunking,
10701         .enable_swap    = nfs4_enable_swap,
10702         .disable_swap   = nfs4_disable_swap,
10703 };
10704
10705 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10706         .name   = XATTR_NAME_NFSV4_ACL,
10707         .list   = nfs4_xattr_list_nfs4_acl,
10708         .get    = nfs4_xattr_get_nfs4_acl,
10709         .set    = nfs4_xattr_set_nfs4_acl,
10710 };
10711
10712 #if defined(CONFIG_NFS_V4_1)
10713 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10714         .name   = XATTR_NAME_NFSV4_DACL,
10715         .list   = nfs4_xattr_list_nfs4_dacl,
10716         .get    = nfs4_xattr_get_nfs4_dacl,
10717         .set    = nfs4_xattr_set_nfs4_dacl,
10718 };
10719
10720 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10721         .name   = XATTR_NAME_NFSV4_SACL,
10722         .list   = nfs4_xattr_list_nfs4_sacl,
10723         .get    = nfs4_xattr_get_nfs4_sacl,
10724         .set    = nfs4_xattr_set_nfs4_sacl,
10725 };
10726 #endif
10727
10728 #ifdef CONFIG_NFS_V4_2
10729 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10730         .prefix = XATTR_USER_PREFIX,
10731         .get    = nfs4_xattr_get_nfs4_user,
10732         .set    = nfs4_xattr_set_nfs4_user,
10733 };
10734 #endif
10735
10736 const struct xattr_handler *nfs4_xattr_handlers[] = {
10737         &nfs4_xattr_nfs4_acl_handler,
10738 #if defined(CONFIG_NFS_V4_1)
10739         &nfs4_xattr_nfs4_dacl_handler,
10740         &nfs4_xattr_nfs4_sacl_handler,
10741 #endif
10742 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10743         &nfs4_xattr_nfs4_label_handler,
10744 #endif
10745 #ifdef CONFIG_NFS_V4_2
10746         &nfs4_xattr_nfs4_user_handler,
10747 #endif
10748         NULL
10749 };