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 <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  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/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.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 "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  76
  77 struct nfs4_opendata;
  78 static int _nfs4_proc_open(struct nfs4_opendata *data);
  79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_FILE_OPEN:
 162                 return -EBUSY;
 163         default:
 164                 dprintk("%s could not handle NFSv4 error %d\n",
 165                                 __func__, -err);
 166                 break;
 167         }
 168         return -EIO;
 169 }
 170
 171 /*
 172  * This is our standard bitmap for GETATTR requests.
 173  */
 174 const u32 nfs4_fattr_bitmap[3] = {
 175         FATTR4_WORD0_TYPE
 176         | FATTR4_WORD0_CHANGE
 177         | FATTR4_WORD0_SIZE
 178         | FATTR4_WORD0_FSID
 179         | FATTR4_WORD0_FILEID,
 180         FATTR4_WORD1_MODE
 181         | FATTR4_WORD1_NUMLINKS
 182         | FATTR4_WORD1_OWNER
 183         | FATTR4_WORD1_OWNER_GROUP
 184         | FATTR4_WORD1_RAWDEV
 185         | FATTR4_WORD1_SPACE_USED
 186         | FATTR4_WORD1_TIME_ACCESS
 187         | FATTR4_WORD1_TIME_METADATA
 188         | FATTR4_WORD1_TIME_MODIFY
 189         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 190 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 191         FATTR4_WORD2_SECURITY_LABEL
 192 #endif
 193 };
 194
 195 static const u32 nfs4_pnfs_open_bitmap[3] = {
 196         FATTR4_WORD0_TYPE
 197         | FATTR4_WORD0_CHANGE
 198         | FATTR4_WORD0_SIZE
 199         | FATTR4_WORD0_FSID
 200         | FATTR4_WORD0_FILEID,
 201         FATTR4_WORD1_MODE
 202         | FATTR4_WORD1_NUMLINKS
 203         | FATTR4_WORD1_OWNER
 204         | FATTR4_WORD1_OWNER_GROUP
 205         | FATTR4_WORD1_RAWDEV
 206         | FATTR4_WORD1_SPACE_USED
 207         | FATTR4_WORD1_TIME_ACCESS
 208         | FATTR4_WORD1_TIME_METADATA
 209         | FATTR4_WORD1_TIME_MODIFY,
 210         FATTR4_WORD2_MDSTHRESHOLD
 211 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 212         | FATTR4_WORD2_SECURITY_LABEL
 213 #endif
 214 };
 215
 216 static const u32 nfs4_open_noattr_bitmap[3] = {
 217         FATTR4_WORD0_TYPE
 218         | FATTR4_WORD0_CHANGE
 219         | FATTR4_WORD0_FILEID,
 220 };
 221
 222 const u32 nfs4_statfs_bitmap[3] = {
 223         FATTR4_WORD0_FILES_AVAIL
 224         | FATTR4_WORD0_FILES_FREE
 225         | FATTR4_WORD0_FILES_TOTAL,
 226         FATTR4_WORD1_SPACE_AVAIL
 227         | FATTR4_WORD1_SPACE_FREE
 228         | FATTR4_WORD1_SPACE_TOTAL
 229 };
 230
 231 const u32 nfs4_pathconf_bitmap[3] = {
 232         FATTR4_WORD0_MAXLINK
 233         | FATTR4_WORD0_MAXNAME,
 234         0
 235 };
 236
 237 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 238                         | FATTR4_WORD0_MAXREAD
 239                         | FATTR4_WORD0_MAXWRITE
 240                         | FATTR4_WORD0_LEASE_TIME,
 241                         FATTR4_WORD1_TIME_DELTA
 242                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 243                         FATTR4_WORD2_LAYOUT_BLKSIZE
 244                         | FATTR4_WORD2_CLONE_BLKSIZE
 245 };
 246
 247 const u32 nfs4_fs_locations_bitmap[3] = {
 248         FATTR4_WORD0_TYPE
 249         | FATTR4_WORD0_CHANGE
 250         | FATTR4_WORD0_SIZE
 251         | FATTR4_WORD0_FSID
 252         | FATTR4_WORD0_FILEID
 253         | FATTR4_WORD0_FS_LOCATIONS,
 254         FATTR4_WORD1_MODE
 255         | FATTR4_WORD1_NUMLINKS
 256         | FATTR4_WORD1_OWNER
 257         | FATTR4_WORD1_OWNER_GROUP
 258         | FATTR4_WORD1_RAWDEV
 259         | FATTR4_WORD1_SPACE_USED
 260         | FATTR4_WORD1_TIME_ACCESS
 261         | FATTR4_WORD1_TIME_METADATA
 262         | FATTR4_WORD1_TIME_MODIFY
 263         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 264 };
 265
 266 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 267                 struct nfs4_readdir_arg *readdir)
 268 {
 269         __be32 *start, *p;
 270
 271         if (cookie > 2) {
 272                 readdir->cookie = cookie;
 273                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 274                 return;
 275         }
 276
 277         readdir->cookie = 0;
 278         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 279         if (cookie == 2)
 280                 return;
 281
 282         /*
 283          * NFSv4 servers do not return entries for '.' and '..'
 284          * Therefore, we fake these entries here.  We let '.'
 285          * have cookie 0 and '..' have cookie 1.  Note that
 286          * when talking to the server, we always send cookie 0
 287          * instead of 1 or 2.
 288          */
 289         start = p = kmap_atomic(*readdir->pages);
 290
 291         if (cookie == 0) {
 292                 *p++ = xdr_one;                                  /* next */
 293                 *p++ = xdr_zero;                   /* cookie, first word */
 294                 *p++ = xdr_one;                   /* cookie, second word */
 295                 *p++ = xdr_one;                             /* entry len */
 296                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 297                 p++;
 298                 *p++ = xdr_one;                         /* bitmap length */
 299                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 300                 *p++ = htonl(8);              /* attribute buffer length */
 301                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 302         }
 303
 304         *p++ = xdr_one;                                  /* next */
 305         *p++ = xdr_zero;                   /* cookie, first word */
 306         *p++ = xdr_two;                   /* cookie, second word */
 307         *p++ = xdr_two;                             /* entry len */
 308         memcpy(p, "..\0\0", 4);                         /* entry */
 309         p++;
 310         *p++ = xdr_one;                         /* bitmap length */
 311         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 312         *p++ = htonl(8);              /* attribute buffer length */
 313         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 314
 315         readdir->pgbase = (char *)p - (char *)start;
 316         readdir->count -= readdir->pgbase;
 317         kunmap_atomic(start);
 318 }
 319
 320 static long nfs4_update_delay(long *timeout)
 321 {
 322         long ret;
 323         if (!timeout)
 324                 return NFS4_POLL_RETRY_MAX;
 325         if (*timeout <= 0)
 326                 *timeout = NFS4_POLL_RETRY_MIN;
 327         if (*timeout > NFS4_POLL_RETRY_MAX)
 328                 *timeout = NFS4_POLL_RETRY_MAX;
 329         ret = *timeout;
 330         *timeout <<= 1;
 331         return ret;
 332 }
 333
 334 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 335 {
 336         int res = 0;
 337
 338         might_sleep();
 339
 340         freezable_schedule_timeout_killable_unsafe(
 341                 nfs4_update_delay(timeout));
 342         if (fatal_signal_pending(current))
 343                 res = -ERESTARTSYS;
 344         return res;
 345 }
 346
 347 /* This is the error handling routine for processes that are allowed
 348  * to sleep.
 349  */
 350 static int nfs4_do_handle_exception(struct nfs_server *server,
 351                 int errorcode, struct nfs4_exception *exception)
 352 {
 353         struct nfs_client *clp = server->nfs_client;
 354         struct nfs4_state *state = exception->state;
 355         struct inode *inode = exception->inode;
 356         int ret = errorcode;
 357
 358         exception->delay = 0;
 359         exception->recovering = 0;
 360         exception->retry = 0;
 361         switch(errorcode) {
 362                 case 0:
 363                         return 0;
 364                 case -NFS4ERR_OPENMODE:
 365                 case -NFS4ERR_DELEG_REVOKED:
 366                 case -NFS4ERR_ADMIN_REVOKED:
 367                 case -NFS4ERR_BAD_STATEID:
 368                         if (inode && nfs_async_inode_return_delegation(inode,
 369                                                 NULL) == 0)
 370                                 goto wait_on_recovery;
 371                         if (state == NULL)
 372                                 break;
 373                         ret = nfs4_schedule_stateid_recovery(server, state);
 374                         if (ret < 0)
 375                                 break;
 376                         goto wait_on_recovery;
 377                 case -NFS4ERR_EXPIRED:
 378                         if (state != NULL) {
 379                                 ret = nfs4_schedule_stateid_recovery(server, state);
 380                                 if (ret < 0)
 381                                         break;
 382                         }
 383                 case -NFS4ERR_STALE_STATEID:
 384                 case -NFS4ERR_STALE_CLIENTID:
 385                         nfs4_schedule_lease_recovery(clp);
 386                         goto wait_on_recovery;
 387                 case -NFS4ERR_MOVED:
 388                         ret = nfs4_schedule_migration_recovery(server);
 389                         if (ret < 0)
 390                                 break;
 391                         goto wait_on_recovery;
 392                 case -NFS4ERR_LEASE_MOVED:
 393                         nfs4_schedule_lease_moved_recovery(clp);
 394                         goto wait_on_recovery;
 395 #if defined(CONFIG_NFS_V4_1)
 396                 case -NFS4ERR_BADSESSION:
 397                 case -NFS4ERR_BADSLOT:
 398                 case -NFS4ERR_BAD_HIGH_SLOT:
 399                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 400                 case -NFS4ERR_DEADSESSION:
 401                 case -NFS4ERR_SEQ_FALSE_RETRY:
 402                 case -NFS4ERR_SEQ_MISORDERED:
 403                         dprintk("%s ERROR: %d Reset session\n", __func__,
 404                                 errorcode);
 405                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 406                         goto wait_on_recovery;
 407 #endif /* defined(CONFIG_NFS_V4_1) */
 408                 case -NFS4ERR_FILE_OPEN:
 409                         if (exception->timeout > HZ) {
 410                                 /* We have retried a decent amount, time to
 411                                  * fail
 412                                  */
 413                                 ret = -EBUSY;
 414                                 break;
 415                         }
 416                 case -NFS4ERR_DELAY:
 417                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 418                 case -NFS4ERR_GRACE:
 419                         exception->delay = 1;
 420                         return 0;
 421
 422                 case -NFS4ERR_RETRY_UNCACHED_REP:
 423                 case -NFS4ERR_OLD_STATEID:
 424                         exception->retry = 1;
 425                         break;
 426                 case -NFS4ERR_BADOWNER:
 427                         /* The following works around a Linux server bug! */
 428                 case -NFS4ERR_BADNAME:
 429                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 430                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 431                                 exception->retry = 1;
 432                                 printk(KERN_WARNING "NFS: v4 server %s "
 433                                                 "does not accept raw "
 434                                                 "uid/gids. "
 435                                                 "Reenabling the idmapper.\n",
 436                                                 server->nfs_client->cl_hostname);
 437                         }
 438         }
 439         /* We failed to handle the error */
 440         return nfs4_map_errors(ret);
 441 wait_on_recovery:
 442         exception->recovering = 1;
 443         return 0;
 444 }
 445
 446 /* This is the error handling routine for processes that are allowed
 447  * to sleep.
 448  */
 449 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 450 {
 451         struct nfs_client *clp = server->nfs_client;
 452         int ret;
 453
 454         ret = nfs4_do_handle_exception(server, errorcode, exception);
 455         if (exception->delay) {
 456                 ret = nfs4_delay(server->client, &exception->timeout);
 457                 goto out_retry;
 458         }
 459         if (exception->recovering) {
 460                 ret = nfs4_wait_clnt_recover(clp);
 461                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 462                         return -EIO;
 463                 goto out_retry;
 464         }
 465         return ret;
 466 out_retry:
 467         if (ret == 0)
 468                 exception->retry = 1;
 469         return ret;
 470 }
 471
 472 static int
 473 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 474                 int errorcode, struct nfs4_exception *exception)
 475 {
 476         struct nfs_client *clp = server->nfs_client;
 477         int ret;
 478
 479         ret = nfs4_do_handle_exception(server, errorcode, exception);
 480         if (exception->delay) {
 481                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 482                 goto out_retry;
 483         }
 484         if (exception->recovering) {
 485                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 486                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 487                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 488                 goto out_retry;
 489         }
 490         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 491                 ret = -EIO;
 492         return ret;
 493 out_retry:
 494         if (ret == 0)
 495                 exception->retry = 1;
 496         return ret;
 497 }
 498
 499 static int
 500 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 501                         struct nfs4_state *state, long *timeout)
 502 {
 503         struct nfs4_exception exception = {
 504                 .state = state,
 505         };
 506
 507         if (task->tk_status >= 0)
 508                 return 0;
 509         if (timeout)
 510                 exception.timeout = *timeout;
 511         task->tk_status = nfs4_async_handle_exception(task, server,
 512                         task->tk_status,
 513                         &exception);
 514         if (exception.delay && timeout)
 515                 *timeout = exception.timeout;
 516         if (exception.retry)
 517                 return -EAGAIN;
 518         return 0;
 519 }
 520
 521 /*
 522  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 523  * or 'false' otherwise.
 524  */
 525 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 526 {
 527         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 528
 529         if (flavor == RPC_AUTH_GSS_KRB5I ||
 530             flavor == RPC_AUTH_GSS_KRB5P)
 531                 return true;
 532
 533         return false;
 534 }
 535
 536 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 537 {
 538         spin_lock(&clp->cl_lock);
 539         if (time_before(clp->cl_last_renewal,timestamp))
 540                 clp->cl_last_renewal = timestamp;
 541         spin_unlock(&clp->cl_lock);
 542 }
 543
 544 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 545 {
 546         struct nfs_client *clp = server->nfs_client;
 547
 548         if (!nfs4_has_session(clp))
 549                 do_renew_lease(clp, timestamp);
 550 }
 551
 552 struct nfs4_call_sync_data {
 553         const struct nfs_server *seq_server;
 554         struct nfs4_sequence_args *seq_args;
 555         struct nfs4_sequence_res *seq_res;
 556 };
 557
 558 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 559                         struct nfs4_sequence_res *res, int cache_reply)
 560 {
 561         args->sa_slot = NULL;
 562         args->sa_cache_this = cache_reply;
 563         args->sa_privileged = 0;
 564
 565         res->sr_slot = NULL;
 566 }
 567
 568 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 569 {
 570         args->sa_privileged = 1;
 571 }
 572
 573 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 574                          struct nfs4_sequence_args *args,
 575                          struct nfs4_sequence_res *res,
 576                          struct rpc_task *task)
 577 {
 578         struct nfs4_slot *slot;
 579
 580         /* slot already allocated? */
 581         if (res->sr_slot != NULL)
 582                 goto out_start;
 583
 584         spin_lock(&tbl->slot_tbl_lock);
 585         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 586                 goto out_sleep;
 587
 588         slot = nfs4_alloc_slot(tbl);
 589         if (IS_ERR(slot)) {
 590                 if (slot == ERR_PTR(-ENOMEM))
 591                         task->tk_timeout = HZ >> 2;
 592                 goto out_sleep;
 593         }
 594         spin_unlock(&tbl->slot_tbl_lock);
 595
 596         args->sa_slot = slot;
 597         res->sr_slot = slot;
 598
 599 out_start:
 600         rpc_call_start(task);
 601         return 0;
 602
 603 out_sleep:
 604         if (args->sa_privileged)
 605                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 606                                 NULL, RPC_PRIORITY_PRIVILEGED);
 607         else
 608                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 609         spin_unlock(&tbl->slot_tbl_lock);
 610         return -EAGAIN;
 611 }
 612 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 613
 614 static int nfs40_sequence_done(struct rpc_task *task,
 615                                struct nfs4_sequence_res *res)
 616 {
 617         struct nfs4_slot *slot = res->sr_slot;
 618         struct nfs4_slot_table *tbl;
 619
 620         if (slot == NULL)
 621                 goto out;
 622
 623         tbl = slot->table;
 624         spin_lock(&tbl->slot_tbl_lock);
 625         if (!nfs41_wake_and_assign_slot(tbl, slot))
 626                 nfs4_free_slot(tbl, slot);
 627         spin_unlock(&tbl->slot_tbl_lock);
 628
 629         res->sr_slot = NULL;
 630 out:
 631         return 1;
 632 }
 633
 634 #if defined(CONFIG_NFS_V4_1)
 635
 636 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 637 {
 638         struct nfs4_session *session;
 639         struct nfs4_slot_table *tbl;
 640         struct nfs4_slot *slot = res->sr_slot;
 641         bool send_new_highest_used_slotid = false;
 642
 643         tbl = slot->table;
 644         session = tbl->session;
 645
 646         spin_lock(&tbl->slot_tbl_lock);
 647         /* Be nice to the server: try to ensure that the last transmitted
 648          * value for highest_user_slotid <= target_highest_slotid
 649          */
 650         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 651                 send_new_highest_used_slotid = true;
 652
 653         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 654                 send_new_highest_used_slotid = false;
 655                 goto out_unlock;
 656         }
 657         nfs4_free_slot(tbl, slot);
 658
 659         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 660                 send_new_highest_used_slotid = false;
 661 out_unlock:
 662         spin_unlock(&tbl->slot_tbl_lock);
 663         res->sr_slot = NULL;
 664         if (send_new_highest_used_slotid)
 665                 nfs41_notify_server(session->clp);
 666 }
 667
 668 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 669 {
 670         struct nfs4_session *session;
 671         struct nfs4_slot *slot = res->sr_slot;
 672         struct nfs_client *clp;
 673         bool interrupted = false;
 674         int ret = 1;
 675
 676         if (slot == NULL)
 677                 goto out_noaction;
 678         /* don't increment the sequence number if the task wasn't sent */
 679         if (!RPC_WAS_SENT(task))
 680                 goto out;
 681
 682         session = slot->table->session;
 683
 684         if (slot->interrupted) {
 685                 slot->interrupted = 0;
 686                 interrupted = true;
 687         }
 688
 689         trace_nfs4_sequence_done(session, res);
 690         /* Check the SEQUENCE operation status */
 691         switch (res->sr_status) {
 692         case 0:
 693                 /* Update the slot's sequence and clientid lease timer */
 694                 ++slot->seq_nr;
 695                 clp = session->clp;
 696                 do_renew_lease(clp, res->sr_timestamp);
 697                 /* Check sequence flags */
 698                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 699                 nfs41_update_target_slotid(slot->table, slot, res);
 700                 break;
 701         case 1:
 702                 /*
 703                  * sr_status remains 1 if an RPC level error occurred.
 704                  * The server may or may not have processed the sequence
 705                  * operation..
 706                  * Mark the slot as having hosted an interrupted RPC call.
 707                  */
 708                 slot->interrupted = 1;
 709                 goto out;
 710         case -NFS4ERR_DELAY:
 711                 /* The server detected a resend of the RPC call and
 712                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 713                  * of RFC5661.
 714                  */
 715                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 716                         __func__,
 717                         slot->slot_nr,
 718                         slot->seq_nr);
 719                 goto out_retry;
 720         case -NFS4ERR_BADSLOT:
 721                 /*
 722                  * The slot id we used was probably retired. Try again
 723                  * using a different slot id.
 724                  */
 725                 goto retry_nowait;
 726         case -NFS4ERR_SEQ_MISORDERED:
 727                 /*
 728                  * Was the last operation on this sequence interrupted?
 729                  * If so, retry after bumping the sequence number.
 730                  */
 731                 if (interrupted) {
 732                         ++slot->seq_nr;
 733                         goto retry_nowait;
 734                 }
 735                 /*
 736                  * Could this slot have been previously retired?
 737                  * If so, then the server may be expecting seq_nr = 1!
 738                  */
 739                 if (slot->seq_nr != 1) {
 740                         slot->seq_nr = 1;
 741                         goto retry_nowait;
 742                 }
 743                 break;
 744         case -NFS4ERR_SEQ_FALSE_RETRY:
 745                 ++slot->seq_nr;
 746                 goto retry_nowait;
 747         default:
 748                 /* Just update the slot sequence no. */
 749                 ++slot->seq_nr;
 750         }
 751 out:
 752         /* The session may be reset by one of the error handlers. */
 753         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 754         nfs41_sequence_free_slot(res);
 755 out_noaction:
 756         return ret;
 757 retry_nowait:
 758         if (rpc_restart_call_prepare(task)) {
 759                 task->tk_status = 0;
 760                 ret = 0;
 761         }
 762         goto out;
 763 out_retry:
 764         if (!rpc_restart_call(task))
 765                 goto out;
 766         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 767         return 0;
 768 }
 769 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 770
 771 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 772 {
 773         if (res->sr_slot == NULL)
 774                 return 1;
 775         if (!res->sr_slot->table->session)
 776                 return nfs40_sequence_done(task, res);
 777         return nfs41_sequence_done(task, res);
 778 }
 779 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 780
 781 int nfs41_setup_sequence(struct nfs4_session *session,
 782                                 struct nfs4_sequence_args *args,
 783                                 struct nfs4_sequence_res *res,
 784                                 struct rpc_task *task)
 785 {
 786         struct nfs4_slot *slot;
 787         struct nfs4_slot_table *tbl;
 788
 789         dprintk("--> %s\n", __func__);
 790         /* slot already allocated? */
 791         if (res->sr_slot != NULL)
 792                 goto out_success;
 793
 794         tbl = &session->fc_slot_table;
 795
 796         task->tk_timeout = 0;
 797
 798         spin_lock(&tbl->slot_tbl_lock);
 799         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 800             !args->sa_privileged) {
 801                 /* The state manager will wait until the slot table is empty */
 802                 dprintk("%s session is draining\n", __func__);
 803                 goto out_sleep;
 804         }
 805
 806         slot = nfs4_alloc_slot(tbl);
 807         if (IS_ERR(slot)) {
 808                 /* If out of memory, try again in 1/4 second */
 809                 if (slot == ERR_PTR(-ENOMEM))
 810                         task->tk_timeout = HZ >> 2;
 811                 dprintk("<-- %s: no free slots\n", __func__);
 812                 goto out_sleep;
 813         }
 814         spin_unlock(&tbl->slot_tbl_lock);
 815
 816         args->sa_slot = slot;
 817
 818         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 819                         slot->slot_nr, slot->seq_nr);
 820
 821         res->sr_slot = slot;
 822         res->sr_timestamp = jiffies;
 823         res->sr_status_flags = 0;
 824         /*
 825          * sr_status is only set in decode_sequence, and so will remain
 826          * set to 1 if an rpc level failure occurs.
 827          */
 828         res->sr_status = 1;
 829         trace_nfs4_setup_sequence(session, args);
 830 out_success:
 831         rpc_call_start(task);
 832         return 0;
 833 out_sleep:
 834         /* Privileged tasks are queued with top priority */
 835         if (args->sa_privileged)
 836                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 837                                 NULL, RPC_PRIORITY_PRIVILEGED);
 838         else
 839                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 840         spin_unlock(&tbl->slot_tbl_lock);
 841         return -EAGAIN;
 842 }
 843 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 844
 845 static int nfs4_setup_sequence(const struct nfs_server *server,
 846                                struct nfs4_sequence_args *args,
 847                                struct nfs4_sequence_res *res,
 848                                struct rpc_task *task)
 849 {
 850         struct nfs4_session *session = nfs4_get_session(server);
 851         int ret = 0;
 852
 853         if (!session)
 854                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 855                                             args, res, task);
 856
 857         dprintk("--> %s clp %p session %p sr_slot %u\n",
 858                 __func__, session->clp, session, res->sr_slot ?
 859                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 860
 861         ret = nfs41_setup_sequence(session, args, res, task);
 862
 863         dprintk("<-- %s status=%d\n", __func__, ret);
 864         return ret;
 865 }
 866
 867 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 868 {
 869         struct nfs4_call_sync_data *data = calldata;
 870         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 871
 872         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 873
 874         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 875 }
 876
 877 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 878 {
 879         struct nfs4_call_sync_data *data = calldata;
 880
 881         nfs41_sequence_done(task, data->seq_res);
 882 }
 883
 884 static const struct rpc_call_ops nfs41_call_sync_ops = {
 885         .rpc_call_prepare = nfs41_call_sync_prepare,
 886         .rpc_call_done = nfs41_call_sync_done,
 887 };
 888
 889 #else   /* !CONFIG_NFS_V4_1 */
 890
 891 static int nfs4_setup_sequence(const struct nfs_server *server,
 892                                struct nfs4_sequence_args *args,
 893                                struct nfs4_sequence_res *res,
 894                                struct rpc_task *task)
 895 {
 896         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 897                                     args, res, task);
 898 }
 899
 900 int nfs4_sequence_done(struct rpc_task *task,
 901                        struct nfs4_sequence_res *res)
 902 {
 903         return nfs40_sequence_done(task, res);
 904 }
 905 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 906
 907 #endif  /* !CONFIG_NFS_V4_1 */
 908
 909 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 910 {
 911         struct nfs4_call_sync_data *data = calldata;
 912         nfs4_setup_sequence(data->seq_server,
 913                                 data->seq_args, data->seq_res, task);
 914 }
 915
 916 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 917 {
 918         struct nfs4_call_sync_data *data = calldata;
 919         nfs4_sequence_done(task, data->seq_res);
 920 }
 921
 922 static const struct rpc_call_ops nfs40_call_sync_ops = {
 923         .rpc_call_prepare = nfs40_call_sync_prepare,
 924         .rpc_call_done = nfs40_call_sync_done,
 925 };
 926
 927 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 928                                    struct nfs_server *server,
 929                                    struct rpc_message *msg,
 930                                    struct nfs4_sequence_args *args,
 931                                    struct nfs4_sequence_res *res)
 932 {
 933         int ret;
 934         struct rpc_task *task;
 935         struct nfs_client *clp = server->nfs_client;
 936         struct nfs4_call_sync_data data = {
 937                 .seq_server = server,
 938                 .seq_args = args,
 939                 .seq_res = res,
 940         };
 941         struct rpc_task_setup task_setup = {
 942                 .rpc_client = clnt,
 943                 .rpc_message = msg,
 944                 .callback_ops = clp->cl_mvops->call_sync_ops,
 945                 .callback_data = &data
 946         };
 947
 948         task = rpc_run_task(&task_setup);
 949         if (IS_ERR(task))
 950                 ret = PTR_ERR(task);
 951         else {
 952                 ret = task->tk_status;
 953                 rpc_put_task(task);
 954         }
 955         return ret;
 956 }
 957
 958 int nfs4_call_sync(struct rpc_clnt *clnt,
 959                    struct nfs_server *server,
 960                    struct rpc_message *msg,
 961                    struct nfs4_sequence_args *args,
 962                    struct nfs4_sequence_res *res,
 963                    int cache_reply)
 964 {
 965         nfs4_init_sequence(args, res, cache_reply);
 966         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 967 }
 968
 969 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 970 {
 971         struct nfs_inode *nfsi = NFS_I(dir);
 972
 973         spin_lock(&dir->i_lock);
 974         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 975         if (!cinfo->atomic || cinfo->before != dir->i_version)
 976                 nfs_force_lookup_revalidate(dir);
 977         dir->i_version = cinfo->after;
 978         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
 979         nfs_fscache_invalidate(dir);
 980         spin_unlock(&dir->i_lock);
 981 }
 982
 983 struct nfs4_opendata {
 984         struct kref kref;
 985         struct nfs_openargs o_arg;
 986         struct nfs_openres o_res;
 987         struct nfs_open_confirmargs c_arg;
 988         struct nfs_open_confirmres c_res;
 989         struct nfs4_string owner_name;
 990         struct nfs4_string group_name;
 991         struct nfs4_label *a_label;
 992         struct nfs_fattr f_attr;
 993         struct nfs4_label *f_label;
 994         struct dentry *dir;
 995         struct dentry *dentry;
 996         struct nfs4_state_owner *owner;
 997         struct nfs4_state *state;
 998         struct iattr attrs;
 999         unsigned long timestamp;
1000         unsigned int rpc_done : 1;
1001         unsigned int file_created : 1;
1002         unsigned int is_recover : 1;
1003         int rpc_status;
1004         int cancelled;
1005 };
1006
1007 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1008                 int err, struct nfs4_exception *exception)
1009 {
1010         if (err != -EINVAL)
1011                 return false;
1012         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1013                 return false;
1014         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1015         exception->retry = 1;
1016         return true;
1017 }
1018
1019 static u32
1020 nfs4_map_atomic_open_share(struct nfs_server *server,
1021                 fmode_t fmode, int openflags)
1022 {
1023         u32 res = 0;
1024
1025         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1026         case FMODE_READ:
1027                 res = NFS4_SHARE_ACCESS_READ;
1028                 break;
1029         case FMODE_WRITE:
1030                 res = NFS4_SHARE_ACCESS_WRITE;
1031                 break;
1032         case FMODE_READ|FMODE_WRITE:
1033                 res = NFS4_SHARE_ACCESS_BOTH;
1034         }
1035         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1036                 goto out;
1037         /* Want no delegation if we're using O_DIRECT */
1038         if (openflags & O_DIRECT)
1039                 res |= NFS4_SHARE_WANT_NO_DELEG;
1040 out:
1041         return res;
1042 }
1043
1044 static enum open_claim_type4
1045 nfs4_map_atomic_open_claim(struct nfs_server *server,
1046                 enum open_claim_type4 claim)
1047 {
1048         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1049                 return claim;
1050         switch (claim) {
1051         default:
1052                 return claim;
1053         case NFS4_OPEN_CLAIM_FH:
1054                 return NFS4_OPEN_CLAIM_NULL;
1055         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1056                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1057         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1058                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1059         }
1060 }
1061
1062 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1063 {
1064         p->o_res.f_attr = &p->f_attr;
1065         p->o_res.f_label = p->f_label;
1066         p->o_res.seqid = p->o_arg.seqid;
1067         p->c_res.seqid = p->c_arg.seqid;
1068         p->o_res.server = p->o_arg.server;
1069         p->o_res.access_request = p->o_arg.access;
1070         nfs_fattr_init(&p->f_attr);
1071         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1072 }
1073
1074 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1075                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1076                 const struct iattr *attrs,
1077                 struct nfs4_label *label,
1078                 enum open_claim_type4 claim,
1079                 gfp_t gfp_mask)
1080 {
1081         struct dentry *parent = dget_parent(dentry);
1082         struct inode *dir = d_inode(parent);
1083         struct nfs_server *server = NFS_SERVER(dir);
1084         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1085         struct nfs4_opendata *p;
1086
1087         p = kzalloc(sizeof(*p), gfp_mask);
1088         if (p == NULL)
1089                 goto err;
1090
1091         p->f_label = nfs4_label_alloc(server, gfp_mask);
1092         if (IS_ERR(p->f_label))
1093                 goto err_free_p;
1094
1095         p->a_label = nfs4_label_alloc(server, gfp_mask);
1096         if (IS_ERR(p->a_label))
1097                 goto err_free_f;
1098
1099         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1100         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1101         if (IS_ERR(p->o_arg.seqid))
1102                 goto err_free_label;
1103         nfs_sb_active(dentry->d_sb);
1104         p->dentry = dget(dentry);
1105         p->dir = parent;
1106         p->owner = sp;
1107         atomic_inc(&sp->so_count);
1108         p->o_arg.open_flags = flags;
1109         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1110         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1111                         fmode, flags);
1112         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1113          * will return permission denied for all bits until close */
1114         if (!(flags & O_EXCL)) {
1115                 /* ask server to check for all possible rights as results
1116                  * are cached */
1117                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1118                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1119         }
1120         p->o_arg.clientid = server->nfs_client->cl_clientid;
1121         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1122         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1123         p->o_arg.name = &dentry->d_name;
1124         p->o_arg.server = server;
1125         p->o_arg.bitmask = nfs4_bitmask(server, label);
1126         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1127         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1128         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1129         switch (p->o_arg.claim) {
1130         case NFS4_OPEN_CLAIM_NULL:
1131         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1132         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1133                 p->o_arg.fh = NFS_FH(dir);
1134                 break;
1135         case NFS4_OPEN_CLAIM_PREVIOUS:
1136         case NFS4_OPEN_CLAIM_FH:
1137         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1138         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1139                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1140         }
1141         if (attrs != NULL && attrs->ia_valid != 0) {
1142                 __u32 verf[2];
1143
1144                 p->o_arg.u.attrs = &p->attrs;
1145                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1146
1147                 verf[0] = jiffies;
1148                 verf[1] = current->pid;
1149                 memcpy(p->o_arg.u.verifier.data, verf,
1150                                 sizeof(p->o_arg.u.verifier.data));
1151         }
1152         p->c_arg.fh = &p->o_res.fh;
1153         p->c_arg.stateid = &p->o_res.stateid;
1154         p->c_arg.seqid = p->o_arg.seqid;
1155         nfs4_init_opendata_res(p);
1156         kref_init(&p->kref);
1157         return p;
1158
1159 err_free_label:
1160         nfs4_label_free(p->a_label);
1161 err_free_f:
1162         nfs4_label_free(p->f_label);
1163 err_free_p:
1164         kfree(p);
1165 err:
1166         dput(parent);
1167         return NULL;
1168 }
1169
1170 static void nfs4_opendata_free(struct kref *kref)
1171 {
1172         struct nfs4_opendata *p = container_of(kref,
1173                         struct nfs4_opendata, kref);
1174         struct super_block *sb = p->dentry->d_sb;
1175
1176         nfs_free_seqid(p->o_arg.seqid);
1177         if (p->state != NULL)
1178                 nfs4_put_open_state(p->state);
1179         nfs4_put_state_owner(p->owner);
1180
1181         nfs4_label_free(p->a_label);
1182         nfs4_label_free(p->f_label);
1183
1184         dput(p->dir);
1185         dput(p->dentry);
1186         nfs_sb_deactive(sb);
1187         nfs_fattr_free_names(&p->f_attr);
1188         kfree(p->f_attr.mdsthreshold);
1189         kfree(p);
1190 }
1191
1192 static void nfs4_opendata_put(struct nfs4_opendata *p)
1193 {
1194         if (p != NULL)
1195                 kref_put(&p->kref, nfs4_opendata_free);
1196 }
1197
1198 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1199 {
1200         int ret;
1201
1202         ret = rpc_wait_for_completion_task(task);
1203         return ret;
1204 }
1205
1206 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1207                 fmode_t fmode)
1208 {
1209         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1210         case FMODE_READ|FMODE_WRITE:
1211                 return state->n_rdwr != 0;
1212         case FMODE_WRITE:
1213                 return state->n_wronly != 0;
1214         case FMODE_READ:
1215                 return state->n_rdonly != 0;
1216         }
1217         WARN_ON_ONCE(1);
1218         return false;
1219 }
1220
1221 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1222 {
1223         int ret = 0;
1224
1225         if (open_mode & (O_EXCL|O_TRUNC))
1226                 goto out;
1227         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1228                 case FMODE_READ:
1229                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1230                                 && state->n_rdonly != 0;
1231                         break;
1232                 case FMODE_WRITE:
1233                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1234                                 && state->n_wronly != 0;
1235                         break;
1236                 case FMODE_READ|FMODE_WRITE:
1237                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1238                                 && state->n_rdwr != 0;
1239         }
1240 out:
1241         return ret;
1242 }
1243
1244 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1245                 enum open_claim_type4 claim)
1246 {
1247         if (delegation == NULL)
1248                 return 0;
1249         if ((delegation->type & fmode) != fmode)
1250                 return 0;
1251         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1252                 return 0;
1253         switch (claim) {
1254         case NFS4_OPEN_CLAIM_NULL:
1255         case NFS4_OPEN_CLAIM_FH:
1256                 break;
1257         case NFS4_OPEN_CLAIM_PREVIOUS:
1258                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1259                         break;
1260         default:
1261                 return 0;
1262         }
1263         nfs_mark_delegation_referenced(delegation);
1264         return 1;
1265 }
1266
1267 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1268 {
1269         switch (fmode) {
1270                 case FMODE_WRITE:
1271                         state->n_wronly++;
1272                         break;
1273                 case FMODE_READ:
1274                         state->n_rdonly++;
1275                         break;
1276                 case FMODE_READ|FMODE_WRITE:
1277                         state->n_rdwr++;
1278         }
1279         nfs4_state_set_mode_locked(state, state->state | fmode);
1280 }
1281
1282 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1283 {
1284         struct nfs_client *clp = state->owner->so_server->nfs_client;
1285         bool need_recover = false;
1286
1287         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1288                 need_recover = true;
1289         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1290                 need_recover = true;
1291         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1292                 need_recover = true;
1293         if (need_recover)
1294                 nfs4_state_mark_reclaim_nograce(clp, state);
1295 }
1296
1297 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1298                 nfs4_stateid *stateid)
1299 {
1300         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1301                 return true;
1302         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1303                 nfs_test_and_clear_all_open_stateid(state);
1304                 return true;
1305         }
1306         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1307                 return true;
1308         return false;
1309 }
1310
1311 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1312 {
1313         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1314                 return;
1315         if (state->n_wronly)
1316                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1317         if (state->n_rdonly)
1318                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1319         if (state->n_rdwr)
1320                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1321         set_bit(NFS_OPEN_STATE, &state->flags);
1322 }
1323
1324 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1325                 nfs4_stateid *arg_stateid,
1326                 nfs4_stateid *stateid, fmode_t fmode)
1327 {
1328         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1329         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1330         case FMODE_WRITE:
1331                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1332                 break;
1333         case FMODE_READ:
1334                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1335                 break;
1336         case 0:
1337                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1338                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1339                 clear_bit(NFS_OPEN_STATE, &state->flags);
1340         }
1341         if (stateid == NULL)
1342                 return;
1343         /* Handle races with OPEN */
1344         if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1345             (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1346             !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1347                 nfs_resync_open_stateid_locked(state);
1348                 return;
1349         }
1350         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1351                 nfs4_stateid_copy(&state->stateid, stateid);
1352         nfs4_stateid_copy(&state->open_stateid, stateid);
1353 }
1354
1355 static void nfs_clear_open_stateid(struct nfs4_state *state,
1356         nfs4_stateid *arg_stateid,
1357         nfs4_stateid *stateid, fmode_t fmode)
1358 {
1359         write_seqlock(&state->seqlock);
1360         nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1361         write_sequnlock(&state->seqlock);
1362         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1363                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1364 }
1365
1366 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1367 {
1368         switch (fmode) {
1369                 case FMODE_READ:
1370                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1371                         break;
1372                 case FMODE_WRITE:
1373                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1374                         break;
1375                 case FMODE_READ|FMODE_WRITE:
1376                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1377         }
1378         if (!nfs_need_update_open_stateid(state, stateid))
1379                 return;
1380         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1381                 nfs4_stateid_copy(&state->stateid, stateid);
1382         nfs4_stateid_copy(&state->open_stateid, stateid);
1383 }
1384
1385 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1386 {
1387         /*
1388          * Protect the call to nfs4_state_set_mode_locked and
1389          * serialise the stateid update
1390          */
1391         spin_lock(&state->owner->so_lock);
1392         write_seqlock(&state->seqlock);
1393         if (deleg_stateid != NULL) {
1394                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1395                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1396         }
1397         if (open_stateid != NULL)
1398                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1399         write_sequnlock(&state->seqlock);
1400         update_open_stateflags(state, fmode);
1401         spin_unlock(&state->owner->so_lock);
1402 }
1403
1404 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1405 {
1406         struct nfs_inode *nfsi = NFS_I(state->inode);
1407         struct nfs_delegation *deleg_cur;
1408         int ret = 0;
1409
1410         fmode &= (FMODE_READ|FMODE_WRITE);
1411
1412         rcu_read_lock();
1413         deleg_cur = rcu_dereference(nfsi->delegation);
1414         if (deleg_cur == NULL)
1415                 goto no_delegation;
1416
1417         spin_lock(&deleg_cur->lock);
1418         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1419            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1420             (deleg_cur->type & fmode) != fmode)
1421                 goto no_delegation_unlock;
1422
1423         if (delegation == NULL)
1424                 delegation = &deleg_cur->stateid;
1425         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1426                 goto no_delegation_unlock;
1427
1428         nfs_mark_delegation_referenced(deleg_cur);
1429         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1430         ret = 1;
1431 no_delegation_unlock:
1432         spin_unlock(&deleg_cur->lock);
1433 no_delegation:
1434         rcu_read_unlock();
1435
1436         if (!ret && open_stateid != NULL) {
1437                 __update_open_stateid(state, open_stateid, NULL, fmode);
1438                 ret = 1;
1439         }
1440         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1441                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1442
1443         return ret;
1444 }
1445
1446 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1447                 const nfs4_stateid *stateid)
1448 {
1449         struct nfs4_state *state = lsp->ls_state;
1450         bool ret = false;
1451
1452         spin_lock(&state->state_lock);
1453         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1454                 goto out_noupdate;
1455         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1456                 goto out_noupdate;
1457         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1458         ret = true;
1459 out_noupdate:
1460         spin_unlock(&state->state_lock);
1461         return ret;
1462 }
1463
1464 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1465 {
1466         struct nfs_delegation *delegation;
1467
1468         rcu_read_lock();
1469         delegation = rcu_dereference(NFS_I(inode)->delegation);
1470         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1471                 rcu_read_unlock();
1472                 return;
1473         }
1474         rcu_read_unlock();
1475         nfs4_inode_return_delegation(inode);
1476 }
1477
1478 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1479 {
1480         struct nfs4_state *state = opendata->state;
1481         struct nfs_inode *nfsi = NFS_I(state->inode);
1482         struct nfs_delegation *delegation;
1483         int open_mode = opendata->o_arg.open_flags;
1484         fmode_t fmode = opendata->o_arg.fmode;
1485         enum open_claim_type4 claim = opendata->o_arg.claim;
1486         nfs4_stateid stateid;
1487         int ret = -EAGAIN;
1488
1489         for (;;) {
1490                 spin_lock(&state->owner->so_lock);
1491                 if (can_open_cached(state, fmode, open_mode)) {
1492                         update_open_stateflags(state, fmode);
1493                         spin_unlock(&state->owner->so_lock);
1494                         goto out_return_state;
1495                 }
1496                 spin_unlock(&state->owner->so_lock);
1497                 rcu_read_lock();
1498                 delegation = rcu_dereference(nfsi->delegation);
1499                 if (!can_open_delegated(delegation, fmode, claim)) {
1500                         rcu_read_unlock();
1501                         break;
1502                 }
1503                 /* Save the delegation */
1504                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1505                 rcu_read_unlock();
1506                 nfs_release_seqid(opendata->o_arg.seqid);
1507                 if (!opendata->is_recover) {
1508                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1509                         if (ret != 0)
1510                                 goto out;
1511                 }
1512                 ret = -EAGAIN;
1513
1514                 /* Try to update the stateid using the delegation */
1515                 if (update_open_stateid(state, NULL, &stateid, fmode))
1516                         goto out_return_state;
1517         }
1518 out:
1519         return ERR_PTR(ret);
1520 out_return_state:
1521         atomic_inc(&state->count);
1522         return state;
1523 }
1524
1525 static void
1526 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1527 {
1528         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1529         struct nfs_delegation *delegation;
1530         int delegation_flags = 0;
1531
1532         rcu_read_lock();
1533         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1534         if (delegation)
1535                 delegation_flags = delegation->flags;
1536         rcu_read_unlock();
1537         switch (data->o_arg.claim) {
1538         default:
1539                 break;
1540         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1541         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1542                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1543                                    "returning a delegation for "
1544                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1545                                    clp->cl_hostname);
1546                 return;
1547         }
1548         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1549                 nfs_inode_set_delegation(state->inode,
1550                                          data->owner->so_cred,
1551                                          &data->o_res);
1552         else
1553                 nfs_inode_reclaim_delegation(state->inode,
1554                                              data->owner->so_cred,
1555                                              &data->o_res);
1556 }
1557
1558 /*
1559  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1560  * and update the nfs4_state.
1561  */
1562 static struct nfs4_state *
1563 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1564 {
1565         struct inode *inode = data->state->inode;
1566         struct nfs4_state *state = data->state;
1567         int ret;
1568
1569         if (!data->rpc_done) {
1570                 if (data->rpc_status) {
1571                         ret = data->rpc_status;
1572                         goto err;
1573                 }
1574                 /* cached opens have already been processed */
1575                 goto update;
1576         }
1577
1578         ret = nfs_refresh_inode(inode, &data->f_attr);
1579         if (ret)
1580                 goto err;
1581
1582         if (data->o_res.delegation_type != 0)
1583                 nfs4_opendata_check_deleg(data, state);
1584 update:
1585         update_open_stateid(state, &data->o_res.stateid, NULL,
1586                             data->o_arg.fmode);
1587         atomic_inc(&state->count);
1588
1589         return state;
1590 err:
1591         return ERR_PTR(ret);
1592
1593 }
1594
1595 static struct nfs4_state *
1596 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1597 {
1598         struct inode *inode;
1599         struct nfs4_state *state = NULL;
1600         int ret;
1601
1602         if (!data->rpc_done) {
1603                 state = nfs4_try_open_cached(data);
1604                 trace_nfs4_cached_open(data->state);
1605                 goto out;
1606         }
1607
1608         ret = -EAGAIN;
1609         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1610                 goto err;
1611         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1612         ret = PTR_ERR(inode);
1613         if (IS_ERR(inode))
1614                 goto err;
1615         ret = -ENOMEM;
1616         state = nfs4_get_open_state(inode, data->owner);
1617         if (state == NULL)
1618                 goto err_put_inode;
1619         if (data->o_res.delegation_type != 0)
1620                 nfs4_opendata_check_deleg(data, state);
1621         update_open_stateid(state, &data->o_res.stateid, NULL,
1622                         data->o_arg.fmode);
1623         iput(inode);
1624 out:
1625         nfs_release_seqid(data->o_arg.seqid);
1626         return state;
1627 err_put_inode:
1628         iput(inode);
1629 err:
1630         return ERR_PTR(ret);
1631 }
1632
1633 static struct nfs4_state *
1634 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1635 {
1636         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1637                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1638         return _nfs4_opendata_to_nfs4_state(data);
1639 }
1640
1641 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1642 {
1643         struct nfs_inode *nfsi = NFS_I(state->inode);
1644         struct nfs_open_context *ctx;
1645
1646         spin_lock(&state->inode->i_lock);
1647         list_for_each_entry(ctx, &nfsi->open_files, list) {
1648                 if (ctx->state != state)
1649                         continue;
1650                 get_nfs_open_context(ctx);
1651                 spin_unlock(&state->inode->i_lock);
1652                 return ctx;
1653         }
1654         spin_unlock(&state->inode->i_lock);
1655         return ERR_PTR(-ENOENT);
1656 }
1657
1658 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1659                 struct nfs4_state *state, enum open_claim_type4 claim)
1660 {
1661         struct nfs4_opendata *opendata;
1662
1663         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1664                         NULL, NULL, claim, GFP_NOFS);
1665         if (opendata == NULL)
1666                 return ERR_PTR(-ENOMEM);
1667         opendata->state = state;
1668         atomic_inc(&state->count);
1669         return opendata;
1670 }
1671
1672 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1673                 fmode_t fmode)
1674 {
1675         struct nfs4_state *newstate;
1676         int ret;
1677
1678         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1679                 return 0;
1680         opendata->o_arg.open_flags = 0;
1681         opendata->o_arg.fmode = fmode;
1682         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1683                         NFS_SB(opendata->dentry->d_sb),
1684                         fmode, 0);
1685         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1686         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1687         nfs4_init_opendata_res(opendata);
1688         ret = _nfs4_recover_proc_open(opendata);
1689         if (ret != 0)
1690                 return ret;
1691         newstate = nfs4_opendata_to_nfs4_state(opendata);
1692         if (IS_ERR(newstate))
1693                 return PTR_ERR(newstate);
1694         if (newstate != opendata->state)
1695                 ret = -ESTALE;
1696         nfs4_close_state(newstate, fmode);
1697         return ret;
1698 }
1699
1700 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1701 {
1702         int ret;
1703
1704         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1705         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1706         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1707         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1708         /* memory barrier prior to reading state->n_* */
1709         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1710         clear_bit(NFS_OPEN_STATE, &state->flags);
1711         smp_rmb();
1712         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1713         if (ret != 0)
1714                 return ret;
1715         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1716         if (ret != 0)
1717                 return ret;
1718         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1719         if (ret != 0)
1720                 return ret;
1721         /*
1722          * We may have performed cached opens for all three recoveries.
1723          * Check if we need to update the current stateid.
1724          */
1725         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1726             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1727                 write_seqlock(&state->seqlock);
1728                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1729                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1730                 write_sequnlock(&state->seqlock);
1731         }
1732         return 0;
1733 }
1734
1735 /*
1736  * OPEN_RECLAIM:
1737  *      reclaim state on the server after a reboot.
1738  */
1739 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1740 {
1741         struct nfs_delegation *delegation;
1742         struct nfs4_opendata *opendata;
1743         fmode_t delegation_type = 0;
1744         int status;
1745
1746         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1747                         NFS4_OPEN_CLAIM_PREVIOUS);
1748         if (IS_ERR(opendata))
1749                 return PTR_ERR(opendata);
1750         rcu_read_lock();
1751         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1752         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1753                 delegation_type = delegation->type;
1754         rcu_read_unlock();
1755         opendata->o_arg.u.delegation_type = delegation_type;
1756         status = nfs4_open_recover(opendata, state);
1757         nfs4_opendata_put(opendata);
1758         return status;
1759 }
1760
1761 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1762 {
1763         struct nfs_server *server = NFS_SERVER(state->inode);
1764         struct nfs4_exception exception = { };
1765         int err;
1766         do {
1767                 err = _nfs4_do_open_reclaim(ctx, state);
1768                 trace_nfs4_open_reclaim(ctx, 0, err);
1769                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1770                         continue;
1771                 if (err != -NFS4ERR_DELAY)
1772                         break;
1773                 nfs4_handle_exception(server, err, &exception);
1774         } while (exception.retry);
1775         return err;
1776 }
1777
1778 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1779 {
1780         struct nfs_open_context *ctx;
1781         int ret;
1782
1783         ctx = nfs4_state_find_open_context(state);
1784         if (IS_ERR(ctx))
1785                 return -EAGAIN;
1786         ret = nfs4_do_open_reclaim(ctx, state);
1787         put_nfs_open_context(ctx);
1788         return ret;
1789 }
1790
1791 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1792 {
1793         switch (err) {
1794                 default:
1795                         printk(KERN_ERR "NFS: %s: unhandled error "
1796                                         "%d.\n", __func__, err);
1797                 case 0:
1798                 case -ENOENT:
1799                 case -EAGAIN:
1800                 case -ESTALE:
1801                         break;
1802                 case -NFS4ERR_BADSESSION:
1803                 case -NFS4ERR_BADSLOT:
1804                 case -NFS4ERR_BAD_HIGH_SLOT:
1805                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1806                 case -NFS4ERR_DEADSESSION:
1807                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1808                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1809                         return -EAGAIN;
1810                 case -NFS4ERR_STALE_CLIENTID:
1811                 case -NFS4ERR_STALE_STATEID:
1812                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1813                 case -NFS4ERR_EXPIRED:
1814                         /* Don't recall a delegation if it was lost */
1815                         nfs4_schedule_lease_recovery(server->nfs_client);
1816                         return -EAGAIN;
1817                 case -NFS4ERR_MOVED:
1818                         nfs4_schedule_migration_recovery(server);
1819                         return -EAGAIN;
1820                 case -NFS4ERR_LEASE_MOVED:
1821                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1822                         return -EAGAIN;
1823                 case -NFS4ERR_DELEG_REVOKED:
1824                 case -NFS4ERR_ADMIN_REVOKED:
1825                 case -NFS4ERR_BAD_STATEID:
1826                 case -NFS4ERR_OPENMODE:
1827                         nfs_inode_find_state_and_recover(state->inode,
1828                                         stateid);
1829                         nfs4_schedule_stateid_recovery(server, state);
1830                         return -EAGAIN;
1831                 case -NFS4ERR_DELAY:
1832                 case -NFS4ERR_GRACE:
1833                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1834                         ssleep(1);
1835                         return -EAGAIN;
1836                 case -ENOMEM:
1837                 case -NFS4ERR_DENIED:
1838                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1839                         return 0;
1840         }
1841         return err;
1842 }
1843
1844 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1845                 struct nfs4_state *state, const nfs4_stateid *stateid,
1846                 fmode_t type)
1847 {
1848         struct nfs_server *server = NFS_SERVER(state->inode);
1849         struct nfs4_opendata *opendata;
1850         int err = 0;
1851
1852         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1853                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1854         if (IS_ERR(opendata))
1855                 return PTR_ERR(opendata);
1856         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1857         write_seqlock(&state->seqlock);
1858         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1859         write_sequnlock(&state->seqlock);
1860         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1861         switch (type & (FMODE_READ|FMODE_WRITE)) {
1862         case FMODE_READ|FMODE_WRITE:
1863         case FMODE_WRITE:
1864                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1865                 if (err)
1866                         break;
1867                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1868                 if (err)
1869                         break;
1870         case FMODE_READ:
1871                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
1872         }
1873         nfs4_opendata_put(opendata);
1874         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1875 }
1876
1877 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1878 {
1879         struct nfs4_opendata *data = calldata;
1880
1881         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1882                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1883 }
1884
1885 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1886 {
1887         struct nfs4_opendata *data = calldata;
1888
1889         nfs40_sequence_done(task, &data->c_res.seq_res);
1890
1891         data->rpc_status = task->tk_status;
1892         if (data->rpc_status == 0) {
1893                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1894                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1895                 renew_lease(data->o_res.server, data->timestamp);
1896                 data->rpc_done = 1;
1897         }
1898 }
1899
1900 static void nfs4_open_confirm_release(void *calldata)
1901 {
1902         struct nfs4_opendata *data = calldata;
1903         struct nfs4_state *state = NULL;
1904
1905         /* If this request hasn't been cancelled, do nothing */
1906         if (data->cancelled == 0)
1907                 goto out_free;
1908         /* In case of error, no cleanup! */
1909         if (!data->rpc_done)
1910                 goto out_free;
1911         state = nfs4_opendata_to_nfs4_state(data);
1912         if (!IS_ERR(state))
1913                 nfs4_close_state(state, data->o_arg.fmode);
1914 out_free:
1915         nfs4_opendata_put(data);
1916 }
1917
1918 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1919         .rpc_call_prepare = nfs4_open_confirm_prepare,
1920         .rpc_call_done = nfs4_open_confirm_done,
1921         .rpc_release = nfs4_open_confirm_release,
1922 };
1923
1924 /*
1925  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1926  */
1927 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1928 {
1929         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1930         struct rpc_task *task;
1931         struct  rpc_message msg = {
1932                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1933                 .rpc_argp = &data->c_arg,
1934                 .rpc_resp = &data->c_res,
1935                 .rpc_cred = data->owner->so_cred,
1936         };
1937         struct rpc_task_setup task_setup_data = {
1938                 .rpc_client = server->client,
1939                 .rpc_message = &msg,
1940                 .callback_ops = &nfs4_open_confirm_ops,
1941                 .callback_data = data,
1942                 .workqueue = nfsiod_workqueue,
1943                 .flags = RPC_TASK_ASYNC,
1944         };
1945         int status;
1946
1947         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1948         kref_get(&data->kref);
1949         data->rpc_done = 0;
1950         data->rpc_status = 0;
1951         data->timestamp = jiffies;
1952         if (data->is_recover)
1953                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
1954         task = rpc_run_task(&task_setup_data);
1955         if (IS_ERR(task))
1956                 return PTR_ERR(task);
1957         status = nfs4_wait_for_completion_rpc_task(task);
1958         if (status != 0) {
1959                 data->cancelled = 1;
1960                 smp_wmb();
1961         } else
1962                 status = data->rpc_status;
1963         rpc_put_task(task);
1964         return status;
1965 }
1966
1967 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1968 {
1969         struct nfs4_opendata *data = calldata;
1970         struct nfs4_state_owner *sp = data->owner;
1971         struct nfs_client *clp = sp->so_server->nfs_client;
1972         enum open_claim_type4 claim = data->o_arg.claim;
1973
1974         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1975                 goto out_wait;
1976         /*
1977          * Check if we still need to send an OPEN call, or if we can use
1978          * a delegation instead.
1979          */
1980         if (data->state != NULL) {
1981                 struct nfs_delegation *delegation;
1982
1983                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1984                         goto out_no_action;
1985                 rcu_read_lock();
1986                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1987                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
1988                         goto unlock_no_action;
1989                 rcu_read_unlock();
1990         }
1991         /* Update client id. */
1992         data->o_arg.clientid = clp->cl_clientid;
1993         switch (claim) {
1994         default:
1995                 break;
1996         case NFS4_OPEN_CLAIM_PREVIOUS:
1997         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1998         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1999                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2000         case NFS4_OPEN_CLAIM_FH:
2001                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2002                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
2003         }
2004         data->timestamp = jiffies;
2005         if (nfs4_setup_sequence(data->o_arg.server,
2006                                 &data->o_arg.seq_args,
2007                                 &data->o_res.seq_res,
2008                                 task) != 0)
2009                 nfs_release_seqid(data->o_arg.seqid);
2010
2011         /* Set the create mode (note dependency on the session type) */
2012         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2013         if (data->o_arg.open_flags & O_EXCL) {
2014                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2015                 if (nfs4_has_persistent_session(clp))
2016                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2017                 else if (clp->cl_mvops->minor_version > 0)
2018                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2019         }
2020         return;
2021 unlock_no_action:
2022         trace_nfs4_cached_open(data->state);
2023         rcu_read_unlock();
2024 out_no_action:
2025         task->tk_action = NULL;
2026 out_wait:
2027         nfs4_sequence_done(task, &data->o_res.seq_res);
2028 }
2029
2030 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2031 {
2032         struct nfs4_opendata *data = calldata;
2033
2034         data->rpc_status = task->tk_status;
2035
2036         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
2037                 return;
2038
2039         if (task->tk_status == 0) {
2040                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2041                         switch (data->o_res.f_attr->mode & S_IFMT) {
2042                         case S_IFREG:
2043                                 break;
2044                         case S_IFLNK:
2045                                 data->rpc_status = -ELOOP;
2046                                 break;
2047                         case S_IFDIR:
2048                                 data->rpc_status = -EISDIR;
2049                                 break;
2050                         default:
2051                                 data->rpc_status = -ENOTDIR;
2052                         }
2053                 }
2054                 renew_lease(data->o_res.server, data->timestamp);
2055                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2056                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2057         }
2058         data->rpc_done = 1;
2059 }
2060
2061 static void nfs4_open_release(void *calldata)
2062 {
2063         struct nfs4_opendata *data = calldata;
2064         struct nfs4_state *state = NULL;
2065
2066         /* If this request hasn't been cancelled, do nothing */
2067         if (data->cancelled == 0)
2068                 goto out_free;
2069         /* In case of error, no cleanup! */
2070         if (data->rpc_status != 0 || !data->rpc_done)
2071                 goto out_free;
2072         /* In case we need an open_confirm, no cleanup! */
2073         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2074                 goto out_free;
2075         state = nfs4_opendata_to_nfs4_state(data);
2076         if (!IS_ERR(state))
2077                 nfs4_close_state(state, data->o_arg.fmode);
2078 out_free:
2079         nfs4_opendata_put(data);
2080 }
2081
2082 static const struct rpc_call_ops nfs4_open_ops = {
2083         .rpc_call_prepare = nfs4_open_prepare,
2084         .rpc_call_done = nfs4_open_done,
2085         .rpc_release = nfs4_open_release,
2086 };
2087
2088 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2089 {
2090         struct inode *dir = d_inode(data->dir);
2091         struct nfs_server *server = NFS_SERVER(dir);
2092         struct nfs_openargs *o_arg = &data->o_arg;
2093         struct nfs_openres *o_res = &data->o_res;
2094         struct rpc_task *task;
2095         struct rpc_message msg = {
2096                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2097                 .rpc_argp = o_arg,
2098                 .rpc_resp = o_res,
2099                 .rpc_cred = data->owner->so_cred,
2100         };
2101         struct rpc_task_setup task_setup_data = {
2102                 .rpc_client = server->client,
2103                 .rpc_message = &msg,
2104                 .callback_ops = &nfs4_open_ops,
2105                 .callback_data = data,
2106                 .workqueue = nfsiod_workqueue,
2107                 .flags = RPC_TASK_ASYNC,
2108         };
2109         int status;
2110
2111         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2112         kref_get(&data->kref);
2113         data->rpc_done = 0;
2114         data->rpc_status = 0;
2115         data->cancelled = 0;
2116         data->is_recover = 0;
2117         if (isrecover) {
2118                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2119                 data->is_recover = 1;
2120         }
2121         task = rpc_run_task(&task_setup_data);
2122         if (IS_ERR(task))
2123                 return PTR_ERR(task);
2124         status = nfs4_wait_for_completion_rpc_task(task);
2125         if (status != 0) {
2126                 data->cancelled = 1;
2127                 smp_wmb();
2128         } else
2129                 status = data->rpc_status;
2130         rpc_put_task(task);
2131
2132         return status;
2133 }
2134
2135 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2136 {
2137         struct inode *dir = d_inode(data->dir);
2138         struct nfs_openres *o_res = &data->o_res;
2139         int status;
2140
2141         status = nfs4_run_open_task(data, 1);
2142         if (status != 0 || !data->rpc_done)
2143                 return status;
2144
2145         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2146
2147         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2148                 status = _nfs4_proc_open_confirm(data);
2149                 if (status != 0)
2150                         return status;
2151         }
2152
2153         return status;
2154 }
2155
2156 /*
2157  * Additional permission checks in order to distinguish between an
2158  * open for read, and an open for execute. This works around the
2159  * fact that NFSv4 OPEN treats read and execute permissions as being
2160  * the same.
2161  * Note that in the non-execute case, we want to turn off permission
2162  * checking if we just created a new file (POSIX open() semantics).
2163  */
2164 static int nfs4_opendata_access(struct rpc_cred *cred,
2165                                 struct nfs4_opendata *opendata,
2166                                 struct nfs4_state *state, fmode_t fmode,
2167                                 int openflags)
2168 {
2169         struct nfs_access_entry cache;
2170         u32 mask;
2171
2172         /* access call failed or for some reason the server doesn't
2173          * support any access modes -- defer access call until later */
2174         if (opendata->o_res.access_supported == 0)
2175                 return 0;
2176
2177         mask = 0;
2178         /*
2179          * Use openflags to check for exec, because fmode won't
2180          * always have FMODE_EXEC set when file open for exec.
2181          */
2182         if (openflags & __FMODE_EXEC) {
2183                 /* ONLY check for exec rights */
2184                 mask = MAY_EXEC;
2185         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2186                 mask = MAY_READ;
2187
2188         cache.cred = cred;
2189         cache.jiffies = jiffies;
2190         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2191         nfs_access_add_cache(state->inode, &cache);
2192
2193         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2194                 return 0;
2195
2196         /* even though OPEN succeeded, access is denied. Close the file */
2197         nfs4_close_state(state, fmode);
2198         return -EACCES;
2199 }
2200
2201 /*
2202  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2203  */
2204 static int _nfs4_proc_open(struct nfs4_opendata *data)
2205 {
2206         struct inode *dir = d_inode(data->dir);
2207         struct nfs_server *server = NFS_SERVER(dir);
2208         struct nfs_openargs *o_arg = &data->o_arg;
2209         struct nfs_openres *o_res = &data->o_res;
2210         int status;
2211
2212         status = nfs4_run_open_task(data, 0);
2213         if (!data->rpc_done)
2214                 return status;
2215         if (status != 0) {
2216                 if (status == -NFS4ERR_BADNAME &&
2217                                 !(o_arg->open_flags & O_CREAT))
2218                         return -ENOENT;
2219                 return status;
2220         }
2221
2222         nfs_fattr_map_and_free_names(server, &data->f_attr);
2223
2224         if (o_arg->open_flags & O_CREAT) {
2225                 update_changeattr(dir, &o_res->cinfo);
2226                 if (o_arg->open_flags & O_EXCL)
2227                         data->file_created = 1;
2228                 else if (o_res->cinfo.before != o_res->cinfo.after)
2229                         data->file_created = 1;
2230         }
2231         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2232                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2233         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2234                 status = _nfs4_proc_open_confirm(data);
2235                 if (status != 0)
2236                         return status;
2237         }
2238         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2239                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2240         return 0;
2241 }
2242
2243 static int nfs4_recover_expired_lease(struct nfs_server *server)
2244 {
2245         return nfs4_client_recover_expired_lease(server->nfs_client);
2246 }
2247
2248 /*
2249  * OPEN_EXPIRED:
2250  *      reclaim state on the server after a network partition.
2251  *      Assumes caller holds the appropriate lock
2252  */
2253 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2254 {
2255         struct nfs4_opendata *opendata;
2256         int ret;
2257
2258         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2259                         NFS4_OPEN_CLAIM_FH);
2260         if (IS_ERR(opendata))
2261                 return PTR_ERR(opendata);
2262         ret = nfs4_open_recover(opendata, state);
2263         if (ret == -ESTALE)
2264                 d_drop(ctx->dentry);
2265         nfs4_opendata_put(opendata);
2266         return ret;
2267 }
2268
2269 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2270 {
2271         struct nfs_server *server = NFS_SERVER(state->inode);
2272         struct nfs4_exception exception = { };
2273         int err;
2274
2275         do {
2276                 err = _nfs4_open_expired(ctx, state);
2277                 trace_nfs4_open_expired(ctx, 0, err);
2278                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2279                         continue;
2280                 switch (err) {
2281                 default:
2282                         goto out;
2283                 case -NFS4ERR_GRACE:
2284                 case -NFS4ERR_DELAY:
2285                         nfs4_handle_exception(server, err, &exception);
2286                         err = 0;
2287                 }
2288         } while (exception.retry);
2289 out:
2290         return err;
2291 }
2292
2293 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2294 {
2295         struct nfs_open_context *ctx;
2296         int ret;
2297
2298         ctx = nfs4_state_find_open_context(state);
2299         if (IS_ERR(ctx))
2300                 return -EAGAIN;
2301         ret = nfs4_do_open_expired(ctx, state);
2302         put_nfs_open_context(ctx);
2303         return ret;
2304 }
2305
2306 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2307 {
2308         nfs_remove_bad_delegation(state->inode);
2309         write_seqlock(&state->seqlock);
2310         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2311         write_sequnlock(&state->seqlock);
2312         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2313 }
2314
2315 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2316 {
2317         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2318                 nfs_finish_clear_delegation_stateid(state);
2319 }
2320
2321 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2322 {
2323         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2324         nfs40_clear_delegation_stateid(state);
2325         return nfs4_open_expired(sp, state);
2326 }
2327
2328 #if defined(CONFIG_NFS_V4_1)
2329 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2330 {
2331         struct nfs_server *server = NFS_SERVER(state->inode);
2332         nfs4_stateid stateid;
2333         struct nfs_delegation *delegation;
2334         struct rpc_cred *cred;
2335         int status;
2336
2337         /* Get the delegation credential for use by test/free_stateid */
2338         rcu_read_lock();
2339         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2340         if (delegation == NULL) {
2341                 rcu_read_unlock();
2342                 return;
2343         }
2344
2345         nfs4_stateid_copy(&stateid, &delegation->stateid);
2346         cred = get_rpccred(delegation->cred);
2347         rcu_read_unlock();
2348         status = nfs41_test_stateid(server, &stateid, cred);
2349         trace_nfs4_test_delegation_stateid(state, NULL, status);
2350
2351         if (status != NFS_OK) {
2352                 /* Free the stateid unless the server explicitly
2353                  * informs us the stateid is unrecognized. */
2354                 if (status != -NFS4ERR_BAD_STATEID)
2355                         nfs41_free_stateid(server, &stateid, cred);
2356                 nfs_finish_clear_delegation_stateid(state);
2357         }
2358
2359         put_rpccred(cred);
2360 }
2361
2362 /**
2363  * nfs41_check_open_stateid - possibly free an open stateid
2364  *
2365  * @state: NFSv4 state for an inode
2366  *
2367  * Returns NFS_OK if recovery for this stateid is now finished.
2368  * Otherwise a negative NFS4ERR value is returned.
2369  */
2370 static int nfs41_check_open_stateid(struct nfs4_state *state)
2371 {
2372         struct nfs_server *server = NFS_SERVER(state->inode);
2373         nfs4_stateid *stateid = &state->open_stateid;
2374         struct rpc_cred *cred = state->owner->so_cred;
2375         int status;
2376
2377         /* If a state reset has been done, test_stateid is unneeded */
2378         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2379             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2380             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2381                 return -NFS4ERR_BAD_STATEID;
2382
2383         status = nfs41_test_stateid(server, stateid, cred);
2384         trace_nfs4_test_open_stateid(state, NULL, status);
2385         if (status != NFS_OK) {
2386                 /* Free the stateid unless the server explicitly
2387                  * informs us the stateid is unrecognized. */
2388                 if (status != -NFS4ERR_BAD_STATEID)
2389                         nfs41_free_stateid(server, stateid, cred);
2390
2391                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2392                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2393                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2394                 clear_bit(NFS_OPEN_STATE, &state->flags);
2395         }
2396         return status;
2397 }
2398
2399 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2400 {
2401         int status;
2402
2403         nfs41_check_delegation_stateid(state);
2404         status = nfs41_check_open_stateid(state);
2405         if (status != NFS_OK)
2406                 status = nfs4_open_expired(sp, state);
2407         return status;
2408 }
2409 #endif
2410
2411 /*
2412  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2413  * fields corresponding to attributes that were used to store the verifier.
2414  * Make sure we clobber those fields in the later setattr call
2415  */
2416 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2417                                 struct iattr *sattr, struct nfs4_label **label)
2418 {
2419         const u32 *attrset = opendata->o_res.attrset;
2420
2421         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2422             !(sattr->ia_valid & ATTR_ATIME_SET))
2423                 sattr->ia_valid |= ATTR_ATIME;
2424
2425         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2426             !(sattr->ia_valid & ATTR_MTIME_SET))
2427                 sattr->ia_valid |= ATTR_MTIME;
2428
2429         /* Except MODE, it seems harmless of setting twice. */
2430         if ((attrset[1] & FATTR4_WORD1_MODE))
2431                 sattr->ia_valid &= ~ATTR_MODE;
2432
2433         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2434                 *label = NULL;
2435 }
2436
2437 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2438                 fmode_t fmode,
2439                 int flags,
2440                 struct nfs_open_context *ctx)
2441 {
2442         struct nfs4_state_owner *sp = opendata->owner;
2443         struct nfs_server *server = sp->so_server;
2444         struct dentry *dentry;
2445         struct nfs4_state *state;
2446         unsigned int seq;
2447         int ret;
2448
2449         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2450
2451         ret = _nfs4_proc_open(opendata);
2452         if (ret != 0)
2453                 goto out;
2454
2455         state = nfs4_opendata_to_nfs4_state(opendata);
2456         ret = PTR_ERR(state);
2457         if (IS_ERR(state))
2458                 goto out;
2459         if (server->caps & NFS_CAP_POSIX_LOCK)
2460                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2461
2462         dentry = opendata->dentry;
2463         if (d_really_is_negative(dentry)) {
2464                 struct dentry *alias;
2465                 d_drop(dentry);
2466                 alias = d_exact_alias(dentry, state->inode);
2467                 if (!alias)
2468                         alias = d_splice_alias(igrab(state->inode), dentry);
2469                 /* d_splice_alias() can't fail here - it's a non-directory */
2470                 if (alias) {
2471                         dput(ctx->dentry);
2472                         ctx->dentry = dentry = alias;
2473                 }
2474                 nfs_set_verifier(dentry,
2475                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2476         }
2477
2478         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2479         if (ret != 0)
2480                 goto out;
2481
2482         ctx->state = state;
2483         if (d_inode(dentry) == state->inode) {
2484                 nfs_inode_attach_open_context(ctx);
2485                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2486                         nfs4_schedule_stateid_recovery(server, state);
2487         }
2488 out:
2489         return ret;
2490 }
2491
2492 /*
2493  * Returns a referenced nfs4_state
2494  */
2495 static int _nfs4_do_open(struct inode *dir,
2496                         struct nfs_open_context *ctx,
2497                         int flags,
2498                         struct iattr *sattr,
2499                         struct nfs4_label *label,
2500                         int *opened)
2501 {
2502         struct nfs4_state_owner  *sp;
2503         struct nfs4_state     *state = NULL;
2504         struct nfs_server       *server = NFS_SERVER(dir);
2505         struct nfs4_opendata *opendata;
2506         struct dentry *dentry = ctx->dentry;
2507         struct rpc_cred *cred = ctx->cred;
2508         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2509         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2510         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2511         struct nfs4_label *olabel = NULL;
2512         int status;
2513
2514         /* Protect against reboot recovery conflicts */
2515         status = -ENOMEM;
2516         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2517         if (sp == NULL) {
2518                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2519                 goto out_err;
2520         }
2521         status = nfs4_recover_expired_lease(server);
2522         if (status != 0)
2523                 goto err_put_state_owner;
2524         if (d_really_is_positive(dentry))
2525                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2526         status = -ENOMEM;
2527         if (d_really_is_positive(dentry))
2528                 claim = NFS4_OPEN_CLAIM_FH;
2529         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2530                         label, claim, GFP_KERNEL);
2531         if (opendata == NULL)
2532                 goto err_put_state_owner;
2533
2534         if (label) {
2535                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2536                 if (IS_ERR(olabel)) {
2537                         status = PTR_ERR(olabel);
2538                         goto err_opendata_put;
2539                 }
2540         }
2541
2542         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2543                 if (!opendata->f_attr.mdsthreshold) {
2544                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2545                         if (!opendata->f_attr.mdsthreshold)
2546                                 goto err_free_label;
2547                 }
2548                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2549         }
2550         if (d_really_is_positive(dentry))
2551                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2552
2553         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2554         if (status != 0)
2555                 goto err_free_label;
2556         state = ctx->state;
2557
2558         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2559             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2560                 nfs4_exclusive_attrset(opendata, sattr, &label);
2561
2562                 nfs_fattr_init(opendata->o_res.f_attr);
2563                 status = nfs4_do_setattr(state->inode, cred,
2564                                 opendata->o_res.f_attr, sattr,
2565                                 state, label, olabel);
2566                 if (status == 0) {
2567                         nfs_setattr_update_inode(state->inode, sattr,
2568                                         opendata->o_res.f_attr);
2569                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2570                 }
2571         }
2572         if (opened && opendata->file_created)
2573                 *opened |= FILE_CREATED;
2574
2575         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2576                 *ctx_th = opendata->f_attr.mdsthreshold;
2577                 opendata->f_attr.mdsthreshold = NULL;
2578         }
2579
2580         nfs4_label_free(olabel);
2581
2582         nfs4_opendata_put(opendata);
2583         nfs4_put_state_owner(sp);
2584         return 0;
2585 err_free_label:
2586         nfs4_label_free(olabel);
2587 err_opendata_put:
2588         nfs4_opendata_put(opendata);
2589 err_put_state_owner:
2590         nfs4_put_state_owner(sp);
2591 out_err:
2592         return status;
2593 }
2594
2595
2596 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2597                                         struct nfs_open_context *ctx,
2598                                         int flags,
2599                                         struct iattr *sattr,
2600                                         struct nfs4_label *label,
2601                                         int *opened)
2602 {
2603         struct nfs_server *server = NFS_SERVER(dir);
2604         struct nfs4_exception exception = { };
2605         struct nfs4_state *res;
2606         int status;
2607
2608         do {
2609                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2610                 res = ctx->state;
2611                 trace_nfs4_open_file(ctx, flags, status);
2612                 if (status == 0)
2613                         break;
2614                 /* NOTE: BAD_SEQID means the server and client disagree about the
2615                  * book-keeping w.r.t. state-changing operations
2616                  * (OPEN/CLOSE/LOCK/LOCKU...)
2617                  * It is actually a sign of a bug on the client or on the server.
2618                  *
2619                  * If we receive a BAD_SEQID error in the particular case of
2620                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2621                  * have unhashed the old state_owner for us, and that we can
2622                  * therefore safely retry using a new one. We should still warn
2623                  * the user though...
2624                  */
2625                 if (status == -NFS4ERR_BAD_SEQID) {
2626                         pr_warn_ratelimited("NFS: v4 server %s "
2627                                         " returned a bad sequence-id error!\n",
2628                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2629                         exception.retry = 1;
2630                         continue;
2631                 }
2632                 /*
2633                  * BAD_STATEID on OPEN means that the server cancelled our
2634                  * state before it received the OPEN_CONFIRM.
2635                  * Recover by retrying the request as per the discussion
2636                  * on Page 181 of RFC3530.
2637                  */
2638                 if (status == -NFS4ERR_BAD_STATEID) {
2639                         exception.retry = 1;
2640                         continue;
2641                 }
2642                 if (status == -EAGAIN) {
2643                         /* We must have found a delegation */
2644                         exception.retry = 1;
2645                         continue;
2646                 }
2647                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2648                         continue;
2649                 res = ERR_PTR(nfs4_handle_exception(server,
2650                                         status, &exception));
2651         } while (exception.retry);
2652         return res;
2653 }
2654
2655 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2656                             struct nfs_fattr *fattr, struct iattr *sattr,
2657                             struct nfs4_state *state, struct nfs4_label *ilabel,
2658                             struct nfs4_label *olabel)
2659 {
2660         struct nfs_server *server = NFS_SERVER(inode);
2661         struct nfs_setattrargs  arg = {
2662                 .fh             = NFS_FH(inode),
2663                 .iap            = sattr,
2664                 .server         = server,
2665                 .bitmask = server->attr_bitmask,
2666                 .label          = ilabel,
2667         };
2668         struct nfs_setattrres  res = {
2669                 .fattr          = fattr,
2670                 .label          = olabel,
2671                 .server         = server,
2672         };
2673         struct rpc_message msg = {
2674                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2675                 .rpc_argp       = &arg,
2676                 .rpc_resp       = &res,
2677                 .rpc_cred       = cred,
2678         };
2679         unsigned long timestamp = jiffies;
2680         fmode_t fmode;
2681         bool truncate;
2682         int status;
2683
2684         arg.bitmask = nfs4_bitmask(server, ilabel);
2685         if (ilabel)
2686                 arg.bitmask = nfs4_bitmask(server, olabel);
2687
2688         nfs_fattr_init(fattr);
2689
2690         /* Servers should only apply open mode checks for file size changes */
2691         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2692         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2693
2694         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2695                 /* Use that stateid */
2696         } else if (truncate && state != NULL) {
2697                 struct nfs_lockowner lockowner = {
2698                         .l_owner = current->files,
2699                         .l_pid = current->tgid,
2700                 };
2701                 if (!nfs4_valid_open_stateid(state))
2702                         return -EBADF;
2703                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2704                                 &lockowner) == -EIO)
2705                         return -EBADF;
2706         } else
2707                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2708
2709         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2710         if (status == 0 && state != NULL)
2711                 renew_lease(server, timestamp);
2712         trace_nfs4_setattr(inode, &arg.stateid, status);
2713         return status;
2714 }
2715
2716 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2717                            struct nfs_fattr *fattr, struct iattr *sattr,
2718                            struct nfs4_state *state, struct nfs4_label *ilabel,
2719                            struct nfs4_label *olabel)
2720 {
2721         struct nfs_server *server = NFS_SERVER(inode);
2722         struct nfs4_exception exception = {
2723                 .state = state,
2724                 .inode = inode,
2725         };
2726         int err;
2727         do {
2728                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2729                 switch (err) {
2730                 case -NFS4ERR_OPENMODE:
2731                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2732                                 pr_warn_once("NFSv4: server %s is incorrectly "
2733                                                 "applying open mode checks to "
2734                                                 "a SETATTR that is not "
2735                                                 "changing file size.\n",
2736                                                 server->nfs_client->cl_hostname);
2737                         }
2738                         if (state && !(state->state & FMODE_WRITE)) {
2739                                 err = -EBADF;
2740                                 if (sattr->ia_valid & ATTR_OPEN)
2741                                         err = -EACCES;
2742                                 goto out;
2743                         }
2744                 }
2745                 err = nfs4_handle_exception(server, err, &exception);
2746         } while (exception.retry);
2747 out:
2748         return err;
2749 }
2750
2751 static bool
2752 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
2753 {
2754         if (inode == NULL || !nfs_have_layout(inode))
2755                 return false;
2756
2757         return pnfs_wait_on_layoutreturn(inode, task);
2758 }
2759
2760 struct nfs4_closedata {
2761         struct inode *inode;
2762         struct nfs4_state *state;
2763         struct nfs_closeargs arg;
2764         struct nfs_closeres res;
2765         struct nfs_fattr fattr;
2766         unsigned long timestamp;
2767         bool roc;
2768         u32 roc_barrier;
2769 };
2770
2771 static void nfs4_free_closedata(void *data)
2772 {
2773         struct nfs4_closedata *calldata = data;
2774         struct nfs4_state_owner *sp = calldata->state->owner;
2775         struct super_block *sb = calldata->state->inode->i_sb;
2776
2777         if (calldata->roc)
2778                 pnfs_roc_release(calldata->state->inode);
2779         nfs4_put_open_state(calldata->state);
2780         nfs_free_seqid(calldata->arg.seqid);
2781         nfs4_put_state_owner(sp);
2782         nfs_sb_deactive(sb);
2783         kfree(calldata);
2784 }
2785
2786 static void nfs4_close_done(struct rpc_task *task, void *data)
2787 {
2788         struct nfs4_closedata *calldata = data;
2789         struct nfs4_state *state = calldata->state;
2790         struct nfs_server *server = NFS_SERVER(calldata->inode);
2791         nfs4_stateid *res_stateid = NULL;
2792
2793         dprintk("%s: begin!\n", __func__);
2794         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2795                 return;
2796         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2797         /* hmm. we are done with the inode, and in the process of freeing
2798          * the state_owner. we keep this around to process errors
2799          */
2800         switch (task->tk_status) {
2801                 case 0:
2802                         res_stateid = &calldata->res.stateid;
2803                         if (calldata->roc)
2804                                 pnfs_roc_set_barrier(state->inode,
2805                                                      calldata->roc_barrier);
2806                         renew_lease(server, calldata->timestamp);
2807                         break;
2808                 case -NFS4ERR_ADMIN_REVOKED:
2809                 case -NFS4ERR_STALE_STATEID:
2810                 case -NFS4ERR_OLD_STATEID:
2811                 case -NFS4ERR_BAD_STATEID:
2812                 case -NFS4ERR_EXPIRED:
2813                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2814                                                 &state->open_stateid)) {
2815                                 rpc_restart_call_prepare(task);
2816                                 goto out_release;
2817                         }
2818                         if (calldata->arg.fmode == 0)
2819                                 break;
2820                 default:
2821                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2822                                 rpc_restart_call_prepare(task);
2823                                 goto out_release;
2824                         }
2825         }
2826         nfs_clear_open_stateid(state, &calldata->arg.stateid,
2827                         res_stateid, calldata->arg.fmode);
2828 out_release:
2829         nfs_release_seqid(calldata->arg.seqid);
2830         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2831         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2832 }
2833
2834 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2835 {
2836         struct nfs4_closedata *calldata = data;
2837         struct nfs4_state *state = calldata->state;
2838         struct inode *inode = calldata->inode;
2839         bool is_rdonly, is_wronly, is_rdwr;
2840         int call_close = 0;
2841
2842         dprintk("%s: begin!\n", __func__);
2843         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2844                 goto out_wait;
2845
2846         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2847         spin_lock(&state->owner->so_lock);
2848         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2849         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2850         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2851         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2852         /* Calculate the change in open mode */
2853         calldata->arg.fmode = 0;
2854         if (state->n_rdwr == 0) {
2855                 if (state->n_rdonly == 0)
2856                         call_close |= is_rdonly;
2857                 else if (is_rdonly)
2858                         calldata->arg.fmode |= FMODE_READ;
2859                 if (state->n_wronly == 0)
2860                         call_close |= is_wronly;
2861                 else if (is_wronly)
2862                         calldata->arg.fmode |= FMODE_WRITE;
2863         } else if (is_rdwr)
2864                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2865
2866         if (calldata->arg.fmode == 0)
2867                 call_close |= is_rdwr;
2868
2869         if (!nfs4_valid_open_stateid(state))
2870                 call_close = 0;
2871         spin_unlock(&state->owner->so_lock);
2872
2873         if (!call_close) {
2874                 /* Note: exit _without_ calling nfs4_close_done */
2875                 goto out_no_action;
2876         }
2877
2878         if (nfs4_wait_on_layoutreturn(inode, task)) {
2879                 nfs_release_seqid(calldata->arg.seqid);
2880                 goto out_wait;
2881         }
2882
2883         if (calldata->arg.fmode == 0)
2884                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2885         if (calldata->roc)
2886                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
2887
2888         calldata->arg.share_access =
2889                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2890                                 calldata->arg.fmode, 0);
2891
2892         nfs_fattr_init(calldata->res.fattr);
2893         calldata->timestamp = jiffies;
2894         if (nfs4_setup_sequence(NFS_SERVER(inode),
2895                                 &calldata->arg.seq_args,
2896                                 &calldata->res.seq_res,
2897                                 task) != 0)
2898                 nfs_release_seqid(calldata->arg.seqid);
2899         dprintk("%s: done!\n", __func__);
2900         return;
2901 out_no_action:
2902         task->tk_action = NULL;
2903 out_wait:
2904         nfs4_sequence_done(task, &calldata->res.seq_res);
2905 }
2906
2907 static const struct rpc_call_ops nfs4_close_ops = {
2908         .rpc_call_prepare = nfs4_close_prepare,
2909         .rpc_call_done = nfs4_close_done,
2910         .rpc_release = nfs4_free_closedata,
2911 };
2912
2913 static bool nfs4_roc(struct inode *inode)
2914 {
2915         if (!nfs_have_layout(inode))
2916                 return false;
2917         return pnfs_roc(inode);
2918 }
2919
2920 /*
2921  * It is possible for data to be read/written from a mem-mapped file
2922  * after the sys_close call (which hits the vfs layer as a flush).
2923  * This means that we can't safely call nfsv4 close on a file until
2924  * the inode is cleared. This in turn means that we are not good
2925  * NFSv4 citizens - we do not indicate to the server to update the file's
2926  * share state even when we are done with one of the three share
2927  * stateid's in the inode.
2928  *
2929  * NOTE: Caller must be holding the sp->so_owner semaphore!
2930  */
2931 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2932 {
2933         struct nfs_server *server = NFS_SERVER(state->inode);
2934         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2935         struct nfs4_closedata *calldata;
2936         struct nfs4_state_owner *sp = state->owner;
2937         struct rpc_task *task;
2938         struct rpc_message msg = {
2939                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2940                 .rpc_cred = state->owner->so_cred,
2941         };
2942         struct rpc_task_setup task_setup_data = {
2943                 .rpc_client = server->client,
2944                 .rpc_message = &msg,
2945                 .callback_ops = &nfs4_close_ops,
2946                 .workqueue = nfsiod_workqueue,
2947                 .flags = RPC_TASK_ASYNC,
2948         };
2949         int status = -ENOMEM;
2950
2951         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2952                 &task_setup_data.rpc_client, &msg);
2953
2954         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2955         if (calldata == NULL)
2956                 goto out;
2957         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2958         calldata->inode = state->inode;
2959         calldata->state = state;
2960         calldata->arg.fh = NFS_FH(state->inode);
2961         /* Serialization for the sequence id */
2962         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2963         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2964         if (IS_ERR(calldata->arg.seqid))
2965                 goto out_free_calldata;
2966         calldata->arg.fmode = 0;
2967         calldata->arg.bitmask = server->cache_consistency_bitmask;
2968         calldata->res.fattr = &calldata->fattr;
2969         calldata->res.seqid = calldata->arg.seqid;
2970         calldata->res.server = server;
2971         calldata->roc = nfs4_roc(state->inode);
2972         nfs_sb_active(calldata->inode->i_sb);
2973
2974         msg.rpc_argp = &calldata->arg;
2975         msg.rpc_resp = &calldata->res;
2976         task_setup_data.callback_data = calldata;
2977         task = rpc_run_task(&task_setup_data);
2978         if (IS_ERR(task))
2979                 return PTR_ERR(task);
2980         status = 0;
2981         if (wait)
2982                 status = rpc_wait_for_completion_task(task);
2983         rpc_put_task(task);
2984         return status;
2985 out_free_calldata:
2986         kfree(calldata);
2987 out:
2988         nfs4_put_open_state(state);
2989         nfs4_put_state_owner(sp);
2990         return status;
2991 }
2992
2993 static struct inode *
2994 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2995                 int open_flags, struct iattr *attr, int *opened)
2996 {
2997         struct nfs4_state *state;
2998         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2999
3000         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3001
3002         /* Protect against concurrent sillydeletes */
3003         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3004
3005         nfs4_label_release_security(label);
3006
3007         if (IS_ERR(state))
3008                 return ERR_CAST(state);
3009         return state->inode;
3010 }
3011
3012 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3013 {
3014         if (ctx->state == NULL)
3015                 return;
3016         if (is_sync)
3017                 nfs4_close_sync(ctx->state, ctx->mode);
3018         else
3019                 nfs4_close_state(ctx->state, ctx->mode);
3020 }
3021
3022 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3023 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3024 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
3025
3026 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3027 {
3028         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3029         struct nfs4_server_caps_arg args = {
3030                 .fhandle = fhandle,
3031                 .bitmask = bitmask,
3032         };
3033         struct nfs4_server_caps_res res = {};
3034         struct rpc_message msg = {
3035                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3036                 .rpc_argp = &args,
3037                 .rpc_resp = &res,
3038         };
3039         int status;
3040
3041         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3042                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3043                      FATTR4_WORD0_LINK_SUPPORT |
3044                      FATTR4_WORD0_SYMLINK_SUPPORT |
3045                      FATTR4_WORD0_ACLSUPPORT;
3046         if (minorversion)
3047                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3048
3049         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3050         if (status == 0) {
3051                 /* Sanity check the server answers */
3052                 switch (minorversion) {
3053                 case 0:
3054                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3055                         res.attr_bitmask[2] = 0;
3056                         break;
3057                 case 1:
3058                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3059                         break;
3060                 case 2:
3061                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3062                 }
3063                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3064                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3065                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3066                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3067                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3068                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3069                                 NFS_CAP_SECURITY_LABEL);
3070                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3071                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3072                         server->caps |= NFS_CAP_ACLS;
3073                 if (res.has_links != 0)
3074                         server->caps |= NFS_CAP_HARDLINKS;
3075                 if (res.has_symlinks != 0)
3076                         server->caps |= NFS_CAP_SYMLINKS;
3077                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3078                         server->caps |= NFS_CAP_FILEID;
3079                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3080                         server->caps |= NFS_CAP_MODE;
3081                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3082                         server->caps |= NFS_CAP_NLINK;
3083                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3084                         server->caps |= NFS_CAP_OWNER;
3085                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3086                         server->caps |= NFS_CAP_OWNER_GROUP;
3087                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3088                         server->caps |= NFS_CAP_ATIME;
3089                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3090                         server->caps |= NFS_CAP_CTIME;
3091                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3092                         server->caps |= NFS_CAP_MTIME;
3093 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3094                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3095                         server->caps |= NFS_CAP_SECURITY_LABEL;
3096 #endif
3097                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3098                                 sizeof(server->attr_bitmask));
3099                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3100
3101                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3102                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3103                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3104                 server->cache_consistency_bitmask[2] = 0;
3105                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3106                         sizeof(server->exclcreat_bitmask));
3107                 server->acl_bitmask = res.acl_bitmask;
3108                 server->fh_expire_type = res.fh_expire_type;
3109         }
3110
3111         return status;
3112 }
3113
3114 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3115 {
3116         struct nfs4_exception exception = { };
3117         int err;
3118         do {
3119                 err = nfs4_handle_exception(server,
3120                                 _nfs4_server_capabilities(server, fhandle),
3121                                 &exception);
3122         } while (exception.retry);
3123         return err;
3124 }
3125
3126 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3127                 struct nfs_fsinfo *info)
3128 {
3129         u32 bitmask[3];
3130         struct nfs4_lookup_root_arg args = {
3131                 .bitmask = bitmask,
3132         };
3133         struct nfs4_lookup_res res = {
3134                 .server = server,
3135                 .fattr = info->fattr,
3136                 .fh = fhandle,
3137         };
3138         struct rpc_message msg = {
3139                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3140                 .rpc_argp = &args,
3141                 .rpc_resp = &res,
3142         };
3143
3144         bitmask[0] = nfs4_fattr_bitmap[0];
3145         bitmask[1] = nfs4_fattr_bitmap[1];
3146         /*
3147          * Process the label in the upcoming getfattr
3148          */
3149         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3150
3151         nfs_fattr_init(info->fattr);
3152         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3153 }
3154
3155 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3156                 struct nfs_fsinfo *info)
3157 {
3158         struct nfs4_exception exception = { };
3159         int err;
3160         do {
3161                 err = _nfs4_lookup_root(server, fhandle, info);
3162                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3163                 switch (err) {
3164                 case 0:
3165                 case -NFS4ERR_WRONGSEC:
3166                         goto out;
3167                 default:
3168                         err = nfs4_handle_exception(server, err, &exception);
3169                 }
3170         } while (exception.retry);
3171 out:
3172         return err;
3173 }
3174
3175 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3176                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3177 {
3178         struct rpc_auth_create_args auth_args = {
3179                 .pseudoflavor = flavor,
3180         };
3181         struct rpc_auth *auth;
3182         int ret;
3183
3184         auth = rpcauth_create(&auth_args, server->client);
3185         if (IS_ERR(auth)) {
3186                 ret = -EACCES;
3187                 goto out;
3188         }
3189         ret = nfs4_lookup_root(server, fhandle, info);
3190 out:
3191         return ret;
3192 }
3193
3194 /*
3195  * Retry pseudoroot lookup with various security flavors.  We do this when:
3196  *
3197  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3198  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3199  *
3200  * Returns zero on success, or a negative NFS4ERR value, or a
3201  * negative errno value.
3202  */
3203 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3204                               struct nfs_fsinfo *info)
3205 {
3206         /* Per 3530bis 15.33.5 */
3207         static const rpc_authflavor_t flav_array[] = {
3208                 RPC_AUTH_GSS_KRB5P,
3209                 RPC_AUTH_GSS_KRB5I,
3210                 RPC_AUTH_GSS_KRB5,
3211                 RPC_AUTH_UNIX,                  /* courtesy */
3212                 RPC_AUTH_NULL,
3213         };
3214         int status = -EPERM;
3215         size_t i;
3216
3217         if (server->auth_info.flavor_len > 0) {
3218                 /* try each flavor specified by user */
3219                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3220                         status = nfs4_lookup_root_sec(server, fhandle, info,
3221                                                 server->auth_info.flavors[i]);
3222                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3223                                 continue;
3224                         break;
3225                 }
3226         } else {
3227                 /* no flavors specified by user, try default list */
3228                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3229                         status = nfs4_lookup_root_sec(server, fhandle, info,
3230                                                       flav_array[i]);
3231                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3232                                 continue;
3233                         break;
3234                 }
3235         }
3236
3237         /*
3238          * -EACCESS could mean that the user doesn't have correct permissions
3239          * to access the mount.  It could also mean that we tried to mount
3240          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3241          * existing mount programs don't handle -EACCES very well so it should
3242          * be mapped to -EPERM instead.
3243          */
3244         if (status == -EACCES)
3245                 status = -EPERM;
3246         return status;
3247 }
3248
3249 static int nfs4_do_find_root_sec(struct nfs_server *server,
3250                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3251 {
3252         int mv = server->nfs_client->cl_minorversion;
3253         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3254 }
3255
3256 /**
3257  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3258  * @server: initialized nfs_server handle
3259  * @fhandle: we fill in the pseudo-fs root file handle
3260  * @info: we fill in an FSINFO struct
3261  * @auth_probe: probe the auth flavours
3262  *
3263  * Returns zero on success, or a negative errno.
3264  */
3265 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3266                          struct nfs_fsinfo *info,
3267                          bool auth_probe)
3268 {
3269         int status = 0;
3270
3271         if (!auth_probe)
3272                 status = nfs4_lookup_root(server, fhandle, info);
3273
3274         if (auth_probe || status == NFS4ERR_WRONGSEC)
3275                 status = nfs4_do_find_root_sec(server, fhandle, info);
3276
3277         if (status == 0)
3278                 status = nfs4_server_capabilities(server, fhandle);
3279         if (status == 0)
3280                 status = nfs4_do_fsinfo(server, fhandle, info);
3281
3282         return nfs4_map_errors(status);
3283 }
3284
3285 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3286                               struct nfs_fsinfo *info)
3287 {
3288         int error;
3289         struct nfs_fattr *fattr = info->fattr;
3290         struct nfs4_label *label = NULL;
3291
3292         error = nfs4_server_capabilities(server, mntfh);
3293         if (error < 0) {
3294                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3295                 return error;
3296         }
3297
3298         label = nfs4_label_alloc(server, GFP_KERNEL);
3299         if (IS_ERR(label))
3300                 return PTR_ERR(label);
3301
3302         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3303         if (error < 0) {
3304                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3305                 goto err_free_label;
3306         }
3307
3308         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3309             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3310                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3311
3312 err_free_label:
3313         nfs4_label_free(label);
3314
3315         return error;
3316 }
3317
3318 /*
3319  * Get locations and (maybe) other attributes of a referral.
3320  * Note that we'll actually follow the referral later when
3321  * we detect fsid mismatch in inode revalidation
3322  */
3323 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3324                              const struct qstr *name, struct nfs_fattr *fattr,
3325                              struct nfs_fh *fhandle)
3326 {
3327         int status = -ENOMEM;
3328         struct page *page = NULL;
3329         struct nfs4_fs_locations *locations = NULL;
3330
3331         page = alloc_page(GFP_KERNEL);
3332         if (page == NULL)
3333                 goto out;
3334         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3335         if (locations == NULL)
3336                 goto out;
3337
3338         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3339         if (status != 0)
3340                 goto out;
3341
3342         /*
3343          * If the fsid didn't change, this is a migration event, not a
3344          * referral.  Cause us to drop into the exception handler, which
3345          * will kick off migration recovery.
3346          */
3347         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3348                 dprintk("%s: server did not return a different fsid for"
3349                         " a referral at %s\n", __func__, name->name);
3350                 status = -NFS4ERR_MOVED;
3351                 goto out;
3352         }
3353         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3354         nfs_fixup_referral_attributes(&locations->fattr);
3355
3356         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3357         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3358         memset(fhandle, 0, sizeof(struct nfs_fh));
3359 out:
3360         if (page)
3361                 __free_page(page);
3362         kfree(locations);
3363         return status;
3364 }
3365
3366 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3367                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3368 {
3369         struct nfs4_getattr_arg args = {
3370                 .fh = fhandle,
3371                 .bitmask = server->attr_bitmask,
3372         };
3373         struct nfs4_getattr_res res = {
3374                 .fattr = fattr,
3375                 .label = label,
3376                 .server = server,
3377         };
3378         struct rpc_message msg = {
3379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3380                 .rpc_argp = &args,
3381                 .rpc_resp = &res,
3382         };
3383
3384         args.bitmask = nfs4_bitmask(server, label);
3385
3386         nfs_fattr_init(fattr);
3387         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3388 }
3389
3390 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3391                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3392 {
3393         struct nfs4_exception exception = { };
3394         int err;
3395         do {
3396                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3397                 trace_nfs4_getattr(server, fhandle, fattr, err);
3398                 err = nfs4_handle_exception(server, err,
3399                                 &exception);
3400         } while (exception.retry);
3401         return err;
3402 }
3403
3404 /*
3405  * The file is not closed if it is opened due to the a request to change
3406  * the size of the file. The open call will not be needed once the
3407  * VFS layer lookup-intents are implemented.
3408  *
3409  * Close is called when the inode is destroyed.
3410  * If we haven't opened the file for O_WRONLY, we
3411  * need to in the size_change case to obtain a stateid.
3412  *
3413  * Got race?
3414  * Because OPEN is always done by name in nfsv4, it is
3415  * possible that we opened a different file by the same
3416  * name.  We can recognize this race condition, but we
3417  * can't do anything about it besides returning an error.
3418  *
3419  * This will be fixed with VFS changes (lookup-intent).
3420  */
3421 static int
3422 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3423                   struct iattr *sattr)
3424 {
3425         struct inode *inode = d_inode(dentry);
3426         struct rpc_cred *cred = NULL;
3427         struct nfs4_state *state = NULL;
3428         struct nfs4_label *label = NULL;
3429         int status;
3430
3431         if (pnfs_ld_layoutret_on_setattr(inode) &&
3432             sattr->ia_valid & ATTR_SIZE &&
3433             sattr->ia_size < i_size_read(inode))
3434                 pnfs_commit_and_return_layout(inode);
3435
3436         nfs_fattr_init(fattr);
3437
3438         /* Deal with open(O_TRUNC) */
3439         if (sattr->ia_valid & ATTR_OPEN)
3440                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3441
3442         /* Optimization: if the end result is no change, don't RPC */
3443         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3444                 return 0;
3445
3446         /* Search for an existing open(O_WRITE) file */
3447         if (sattr->ia_valid & ATTR_FILE) {
3448                 struct nfs_open_context *ctx;
3449
3450                 ctx = nfs_file_open_context(sattr->ia_file);
3451                 if (ctx) {
3452                         cred = ctx->cred;
3453                         state = ctx->state;
3454                 }
3455         }
3456
3457         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3458         if (IS_ERR(label))
3459                 return PTR_ERR(label);
3460
3461         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3462         if (status == 0) {
3463                 nfs_setattr_update_inode(inode, sattr, fattr);
3464                 nfs_setsecurity(inode, fattr, label);
3465         }
3466         nfs4_label_free(label);
3467         return status;
3468 }
3469
3470 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3471                 const struct qstr *name, struct nfs_fh *fhandle,
3472                 struct nfs_fattr *fattr, struct nfs4_label *label)
3473 {
3474         struct nfs_server *server = NFS_SERVER(dir);
3475         int                    status;
3476         struct nfs4_lookup_arg args = {
3477                 .bitmask = server->attr_bitmask,
3478                 .dir_fh = NFS_FH(dir),
3479                 .name = name,
3480         };
3481         struct nfs4_lookup_res res = {
3482                 .server = server,
3483                 .fattr = fattr,
3484                 .label = label,
3485                 .fh = fhandle,
3486         };
3487         struct rpc_message msg = {
3488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3489                 .rpc_argp = &args,
3490                 .rpc_resp = &res,
3491         };
3492
3493         args.bitmask = nfs4_bitmask(server, label);
3494
3495         nfs_fattr_init(fattr);
3496
3497         dprintk("NFS call  lookup %s\n", name->name);
3498         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3499         dprintk("NFS reply lookup: %d\n", status);
3500         return status;
3501 }
3502
3503 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3504 {
3505         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3506                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3507         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3508         fattr->nlink = 2;
3509 }
3510
3511 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3512                                    struct qstr *name, struct nfs_fh *fhandle,
3513                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3514 {
3515         struct nfs4_exception exception = { };
3516         struct rpc_clnt *client = *clnt;
3517         int err;
3518         do {
3519                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3520                 trace_nfs4_lookup(dir, name, err);
3521                 switch (err) {
3522                 case -NFS4ERR_BADNAME:
3523                         err = -ENOENT;
3524                         goto out;
3525                 case -NFS4ERR_MOVED:
3526                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3527                         if (err == -NFS4ERR_MOVED)
3528                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3529                         goto out;
3530                 case -NFS4ERR_WRONGSEC:
3531                         err = -EPERM;
3532                         if (client != *clnt)
3533                                 goto out;
3534                         client = nfs4_negotiate_security(client, dir, name);
3535                         if (IS_ERR(client))
3536                                 return PTR_ERR(client);
3537
3538                         exception.retry = 1;
3539                         break;
3540                 default:
3541                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3542                 }
3543         } while (exception.retry);
3544
3545 out:
3546         if (err == 0)
3547                 *clnt = client;
3548         else if (client != *clnt)
3549                 rpc_shutdown_client(client);
3550
3551         return err;
3552 }
3553
3554 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3555                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3556                             struct nfs4_label *label)
3557 {
3558         int status;
3559         struct rpc_clnt *client = NFS_CLIENT(dir);
3560
3561         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3562         if (client != NFS_CLIENT(dir)) {
3563                 rpc_shutdown_client(client);
3564                 nfs_fixup_secinfo_attributes(fattr);
3565         }
3566         return status;
3567 }
3568
3569 struct rpc_clnt *
3570 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3571                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3572 {
3573         struct rpc_clnt *client = NFS_CLIENT(dir);
3574         int status;
3575
3576         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3577         if (status < 0)
3578                 return ERR_PTR(status);
3579         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3580 }
3581
3582 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3583 {
3584         struct nfs_server *server = NFS_SERVER(inode);
3585         struct nfs4_accessargs args = {
3586                 .fh = NFS_FH(inode),
3587                 .bitmask = server->cache_consistency_bitmask,
3588         };
3589         struct nfs4_accessres res = {
3590                 .server = server,
3591         };
3592         struct rpc_message msg = {
3593                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3594                 .rpc_argp = &args,
3595                 .rpc_resp = &res,
3596                 .rpc_cred = entry->cred,
3597         };
3598         int mode = entry->mask;
3599         int status = 0;
3600
3601         /*
3602          * Determine which access bits we want to ask for...
3603          */
3604         if (mode & MAY_READ)
3605                 args.access |= NFS4_ACCESS_READ;
3606         if (S_ISDIR(inode->i_mode)) {
3607                 if (mode & MAY_WRITE)
3608                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3609                 if (mode & MAY_EXEC)
3610                         args.access |= NFS4_ACCESS_LOOKUP;
3611         } else {
3612                 if (mode & MAY_WRITE)
3613                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3614                 if (mode & MAY_EXEC)
3615                         args.access |= NFS4_ACCESS_EXECUTE;
3616         }
3617
3618         res.fattr = nfs_alloc_fattr();
3619         if (res.fattr == NULL)
3620                 return -ENOMEM;
3621
3622         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3623         if (!status) {
3624                 nfs_access_set_mask(entry, res.access);
3625                 nfs_refresh_inode(inode, res.fattr);
3626         }
3627         nfs_free_fattr(res.fattr);
3628         return status;
3629 }
3630
3631 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3632 {
3633         struct nfs4_exception exception = { };
3634         int err;
3635         do {
3636                 err = _nfs4_proc_access(inode, entry);
3637                 trace_nfs4_access(inode, err);
3638                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3639                                 &exception);
3640         } while (exception.retry);
3641         return err;
3642 }
3643
3644 /*
3645  * TODO: For the time being, we don't try to get any attributes
3646  * along with any of the zero-copy operations READ, READDIR,
3647  * READLINK, WRITE.
3648  *
3649  * In the case of the first three, we want to put the GETATTR
3650  * after the read-type operation -- this is because it is hard
3651  * to predict the length of a GETATTR response in v4, and thus
3652  * align the READ data correctly.  This means that the GETATTR
3653  * may end up partially falling into the page cache, and we should
3654  * shift it into the 'tail' of the xdr_buf before processing.
3655  * To do this efficiently, we need to know the total length
3656  * of data received, which doesn't seem to be available outside
3657  * of the RPC layer.
3658  *
3659  * In the case of WRITE, we also want to put the GETATTR after
3660  * the operation -- in this case because we want to make sure
3661  * we get the post-operation mtime and size.
3662  *
3663  * Both of these changes to the XDR layer would in fact be quite
3664  * minor, but I decided to leave them for a subsequent patch.
3665  */
3666 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3667                 unsigned int pgbase, unsigned int pglen)
3668 {
3669         struct nfs4_readlink args = {
3670                 .fh       = NFS_FH(inode),
3671                 .pgbase   = pgbase,
3672                 .pglen    = pglen,
3673                 .pages    = &page,
3674         };
3675         struct nfs4_readlink_res res;
3676         struct rpc_message msg = {
3677                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3678                 .rpc_argp = &args,
3679                 .rpc_resp = &res,
3680         };
3681
3682         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3683 }
3684
3685 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3686                 unsigned int pgbase, unsigned int pglen)
3687 {
3688         struct nfs4_exception exception = { };
3689         int err;
3690         do {
3691                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3692                 trace_nfs4_readlink(inode, err);
3693                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3694                                 &exception);
3695         } while (exception.retry);
3696         return err;
3697 }
3698
3699 /*
3700  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3701  */
3702 static int
3703 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3704                  int flags)
3705 {
3706         struct nfs4_label l, *ilabel = NULL;
3707         struct nfs_open_context *ctx;
3708         struct nfs4_state *state;
3709         int status = 0;
3710
3711         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3712         if (IS_ERR(ctx))
3713                 return PTR_ERR(ctx);
3714
3715         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3716
3717         sattr->ia_mode &= ~current_umask();
3718         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3719         if (IS_ERR(state)) {
3720                 status = PTR_ERR(state);
3721                 goto out;
3722         }
3723 out:
3724         nfs4_label_release_security(ilabel);
3725         put_nfs_open_context(ctx);
3726         return status;
3727 }
3728
3729 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3730 {
3731         struct nfs_server *server = NFS_SERVER(dir);
3732         struct nfs_removeargs args = {
3733                 .fh = NFS_FH(dir),
3734                 .name = *name,
3735         };
3736         struct nfs_removeres res = {
3737                 .server = server,
3738         };
3739         struct rpc_message msg = {
3740                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3741                 .rpc_argp = &args,
3742                 .rpc_resp = &res,
3743         };
3744         int status;
3745
3746         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3747         if (status == 0)
3748                 update_changeattr(dir, &res.cinfo);
3749         return status;
3750 }
3751
3752 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3753 {
3754         struct nfs4_exception exception = { };
3755         int err;
3756         do {
3757                 err = _nfs4_proc_remove(dir, name);
3758                 trace_nfs4_remove(dir, name, err);
3759                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3760                                 &exception);
3761         } while (exception.retry);
3762         return err;
3763 }
3764
3765 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3766 {
3767         struct nfs_server *server = NFS_SERVER(dir);
3768         struct nfs_removeargs *args = msg->rpc_argp;
3769         struct nfs_removeres *res = msg->rpc_resp;
3770
3771         res->server = server;
3772         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3773         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3774
3775         nfs_fattr_init(res->dir_attr);
3776 }
3777
3778 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3779 {
3780         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb),
3781                         &data->args.seq_args,
3782                         &data->res.seq_res,
3783                         task);
3784 }
3785
3786 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3787 {
3788         struct nfs_unlinkdata *data = task->tk_calldata;
3789         struct nfs_removeres *res = &data->res;
3790
3791         if (!nfs4_sequence_done(task, &res->seq_res))
3792                 return 0;
3793         if (nfs4_async_handle_error(task, res->server, NULL,
3794                                     &data->timeout) == -EAGAIN)
3795                 return 0;
3796         update_changeattr(dir, &res->cinfo);
3797         return 1;
3798 }
3799
3800 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3801 {
3802         struct nfs_server *server = NFS_SERVER(dir);
3803         struct nfs_renameargs *arg = msg->rpc_argp;
3804         struct nfs_renameres *res = msg->rpc_resp;
3805
3806         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3807         res->server = server;
3808         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3809 }
3810
3811 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3812 {
3813         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3814                         &data->args.seq_args,
3815                         &data->res.seq_res,
3816                         task);
3817 }
3818
3819 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3820                                  struct inode *new_dir)
3821 {
3822         struct nfs_renamedata *data = task->tk_calldata;
3823         struct nfs_renameres *res = &data->res;
3824
3825         if (!nfs4_sequence_done(task, &res->seq_res))
3826                 return 0;
3827         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3828                 return 0;
3829
3830         update_changeattr(old_dir, &res->old_cinfo);
3831         update_changeattr(new_dir, &res->new_cinfo);
3832         return 1;
3833 }
3834
3835 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3836 {
3837         struct nfs_server *server = NFS_SERVER(inode);
3838         struct nfs4_link_arg arg = {
3839                 .fh     = NFS_FH(inode),
3840                 .dir_fh = NFS_FH(dir),
3841                 .name   = name,
3842                 .bitmask = server->attr_bitmask,
3843         };
3844         struct nfs4_link_res res = {
3845                 .server = server,
3846                 .label = NULL,
3847         };
3848         struct rpc_message msg = {
3849                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3850                 .rpc_argp = &arg,
3851                 .rpc_resp = &res,
3852         };
3853         int status = -ENOMEM;
3854
3855         res.fattr = nfs_alloc_fattr();
3856         if (res.fattr == NULL)
3857                 goto out;
3858
3859         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3860         if (IS_ERR(res.label)) {
3861                 status = PTR_ERR(res.label);
3862                 goto out;
3863         }
3864         arg.bitmask = nfs4_bitmask(server, res.label);
3865
3866         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3867         if (!status) {
3868                 update_changeattr(dir, &res.cinfo);
3869                 status = nfs_post_op_update_inode(inode, res.fattr);
3870                 if (!status)
3871                         nfs_setsecurity(inode, res.fattr, res.label);
3872         }
3873
3874
3875         nfs4_label_free(res.label);
3876
3877 out:
3878         nfs_free_fattr(res.fattr);
3879         return status;
3880 }
3881
3882 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3883 {
3884         struct nfs4_exception exception = { };
3885         int err;
3886         do {
3887                 err = nfs4_handle_exception(NFS_SERVER(inode),
3888                                 _nfs4_proc_link(inode, dir, name),
3889                                 &exception);
3890         } while (exception.retry);
3891         return err;
3892 }
3893
3894 struct nfs4_createdata {
3895         struct rpc_message msg;
3896         struct nfs4_create_arg arg;
3897         struct nfs4_create_res res;
3898         struct nfs_fh fh;
3899         struct nfs_fattr fattr;
3900         struct nfs4_label *label;
3901 };
3902
3903 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3904                 struct qstr *name, struct iattr *sattr, u32 ftype)
3905 {
3906         struct nfs4_createdata *data;
3907
3908         data = kzalloc(sizeof(*data), GFP_KERNEL);
3909         if (data != NULL) {
3910                 struct nfs_server *server = NFS_SERVER(dir);
3911
3912                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3913                 if (IS_ERR(data->label))
3914                         goto out_free;
3915
3916                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3917                 data->msg.rpc_argp = &data->arg;
3918                 data->msg.rpc_resp = &data->res;
3919                 data->arg.dir_fh = NFS_FH(dir);
3920                 data->arg.server = server;
3921                 data->arg.name = name;
3922                 data->arg.attrs = sattr;
3923                 data->arg.ftype = ftype;
3924                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3925                 data->res.server = server;
3926                 data->res.fh = &data->fh;
3927                 data->res.fattr = &data->fattr;
3928                 data->res.label = data->label;
3929                 nfs_fattr_init(data->res.fattr);
3930         }
3931         return data;
3932 out_free:
3933         kfree(data);
3934         return NULL;
3935 }
3936
3937 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3938 {
3939         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3940                                     &data->arg.seq_args, &data->res.seq_res, 1);
3941         if (status == 0) {
3942                 update_changeattr(dir, &data->res.dir_cinfo);
3943                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3944         }
3945         return status;
3946 }
3947
3948 static void nfs4_free_createdata(struct nfs4_createdata *data)
3949 {
3950         nfs4_label_free(data->label);
3951         kfree(data);
3952 }
3953
3954 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3955                 struct page *page, unsigned int len, struct iattr *sattr,
3956                 struct nfs4_label *label)
3957 {
3958         struct nfs4_createdata *data;
3959         int status = -ENAMETOOLONG;
3960
3961         if (len > NFS4_MAXPATHLEN)
3962                 goto out;
3963
3964         status = -ENOMEM;
3965         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3966         if (data == NULL)
3967                 goto out;
3968
3969         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3970         data->arg.u.symlink.pages = &page;
3971         data->arg.u.symlink.len = len;
3972         data->arg.label = label;
3973
3974         status = nfs4_do_create(dir, dentry, data);
3975
3976         nfs4_free_createdata(data);
3977 out:
3978         return status;
3979 }
3980
3981 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3982                 struct page *page, unsigned int len, struct iattr *sattr)
3983 {
3984         struct nfs4_exception exception = { };
3985         struct nfs4_label l, *label = NULL;
3986         int err;
3987
3988         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3989
3990         do {
3991                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3992                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3993                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3994                                 &exception);
3995         } while (exception.retry);
3996
3997         nfs4_label_release_security(label);
3998         return err;
3999 }
4000
4001 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4002                 struct iattr *sattr, struct nfs4_label *label)
4003 {
4004         struct nfs4_createdata *data;
4005         int status = -ENOMEM;
4006
4007         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4008         if (data == NULL)
4009                 goto out;
4010
4011         data->arg.label = label;
4012         status = nfs4_do_create(dir, dentry, data);
4013
4014         nfs4_free_createdata(data);
4015 out:
4016         return status;
4017 }
4018
4019 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4020                 struct iattr *sattr)
4021 {
4022         struct nfs4_exception exception = { };
4023         struct nfs4_label l, *label = NULL;
4024         int err;
4025
4026         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4027
4028         sattr->ia_mode &= ~current_umask();
4029         do {
4030                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4031                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4032                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4033                                 &exception);
4034         } while (exception.retry);
4035         nfs4_label_release_security(label);
4036
4037         return err;
4038 }
4039
4040 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4041                 u64 cookie, struct page **pages, unsigned int count, int plus)
4042 {
4043         struct inode            *dir = d_inode(dentry);
4044         struct nfs4_readdir_arg args = {
4045                 .fh = NFS_FH(dir),
4046                 .pages = pages,
4047                 .pgbase = 0,
4048                 .count = count,
4049                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4050                 .plus = plus,
4051         };
4052         struct nfs4_readdir_res res;
4053         struct rpc_message msg = {
4054                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4055                 .rpc_argp = &args,
4056                 .rpc_resp = &res,
4057                 .rpc_cred = cred,
4058         };
4059         int                     status;
4060
4061         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4062                         dentry,
4063                         (unsigned long long)cookie);
4064         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4065         res.pgbase = args.pgbase;
4066         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4067         if (status >= 0) {
4068                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4069                 status += args.pgbase;
4070         }
4071
4072         nfs_invalidate_atime(dir);
4073
4074         dprintk("%s: returns %d\n", __func__, status);
4075         return status;
4076 }
4077
4078 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4079                 u64 cookie, struct page **pages, unsigned int count, int plus)
4080 {
4081         struct nfs4_exception exception = { };
4082         int err;
4083         do {
4084                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4085                                 pages, count, plus);
4086                 trace_nfs4_readdir(d_inode(dentry), err);
4087                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4088                                 &exception);
4089         } while (exception.retry);
4090         return err;
4091 }
4092
4093 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4094                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4095 {
4096         struct nfs4_createdata *data;
4097         int mode = sattr->ia_mode;
4098         int status = -ENOMEM;
4099
4100         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4101         if (data == NULL)
4102                 goto out;
4103
4104         if (S_ISFIFO(mode))
4105                 data->arg.ftype = NF4FIFO;
4106         else if (S_ISBLK(mode)) {
4107                 data->arg.ftype = NF4BLK;
4108                 data->arg.u.device.specdata1 = MAJOR(rdev);
4109                 data->arg.u.device.specdata2 = MINOR(rdev);
4110         }
4111         else if (S_ISCHR(mode)) {
4112                 data->arg.ftype = NF4CHR;
4113                 data->arg.u.device.specdata1 = MAJOR(rdev);
4114                 data->arg.u.device.specdata2 = MINOR(rdev);
4115         } else if (!S_ISSOCK(mode)) {
4116                 status = -EINVAL;
4117                 goto out_free;
4118         }
4119
4120         data->arg.label = label;
4121         status = nfs4_do_create(dir, dentry, data);
4122 out_free:
4123         nfs4_free_createdata(data);
4124 out:
4125         return status;
4126 }
4127
4128 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4129                 struct iattr *sattr, dev_t rdev)
4130 {
4131         struct nfs4_exception exception = { };
4132         struct nfs4_label l, *label = NULL;
4133         int err;
4134
4135         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4136
4137         sattr->ia_mode &= ~current_umask();
4138         do {
4139                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4140                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4141                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4142                                 &exception);
4143         } while (exception.retry);
4144
4145         nfs4_label_release_security(label);
4146
4147         return err;
4148 }
4149
4150 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4151                  struct nfs_fsstat *fsstat)
4152 {
4153         struct nfs4_statfs_arg args = {
4154                 .fh = fhandle,
4155                 .bitmask = server->attr_bitmask,
4156         };
4157         struct nfs4_statfs_res res = {
4158                 .fsstat = fsstat,
4159         };
4160         struct rpc_message msg = {
4161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4162                 .rpc_argp = &args,
4163                 .rpc_resp = &res,
4164         };
4165
4166         nfs_fattr_init(fsstat->fattr);
4167         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4168 }
4169
4170 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4171 {
4172         struct nfs4_exception exception = { };
4173         int err;
4174         do {
4175                 err = nfs4_handle_exception(server,
4176                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4177                                 &exception);
4178         } while (exception.retry);
4179         return err;
4180 }
4181
4182 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4183                 struct nfs_fsinfo *fsinfo)
4184 {
4185         struct nfs4_fsinfo_arg args = {
4186                 .fh = fhandle,
4187                 .bitmask = server->attr_bitmask,
4188         };
4189         struct nfs4_fsinfo_res res = {
4190                 .fsinfo = fsinfo,
4191         };
4192         struct rpc_message msg = {
4193                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4194                 .rpc_argp = &args,
4195                 .rpc_resp = &res,
4196         };
4197
4198         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4199 }
4200
4201 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4202 {
4203         struct nfs4_exception exception = { };
4204         unsigned long now = jiffies;
4205         int err;
4206
4207         do {
4208                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4209                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4210                 if (err == 0) {
4211                         struct nfs_client *clp = server->nfs_client;
4212
4213                         spin_lock(&clp->cl_lock);
4214                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4215                         clp->cl_last_renewal = now;
4216                         spin_unlock(&clp->cl_lock);
4217                         break;
4218                 }
4219                 err = nfs4_handle_exception(server, err, &exception);
4220         } while (exception.retry);
4221         return err;
4222 }
4223
4224 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4225 {
4226         int error;
4227
4228         nfs_fattr_init(fsinfo->fattr);
4229         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4230         if (error == 0) {
4231                 /* block layout checks this! */
4232                 server->pnfs_blksize = fsinfo->blksize;
4233                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4234         }
4235
4236         return error;
4237 }
4238
4239 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4240                 struct nfs_pathconf *pathconf)
4241 {
4242         struct nfs4_pathconf_arg args = {
4243                 .fh = fhandle,
4244                 .bitmask = server->attr_bitmask,
4245         };
4246         struct nfs4_pathconf_res res = {
4247                 .pathconf = pathconf,
4248         };
4249         struct rpc_message msg = {
4250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4251                 .rpc_argp = &args,
4252                 .rpc_resp = &res,
4253         };
4254
4255         /* None of the pathconf attributes are mandatory to implement */
4256         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4257                 memset(pathconf, 0, sizeof(*pathconf));
4258                 return 0;
4259         }
4260
4261         nfs_fattr_init(pathconf->fattr);
4262         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4263 }
4264
4265 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4266                 struct nfs_pathconf *pathconf)
4267 {
4268         struct nfs4_exception exception = { };
4269         int err;
4270
4271         do {
4272                 err = nfs4_handle_exception(server,
4273                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4274                                 &exception);
4275         } while (exception.retry);
4276         return err;
4277 }
4278
4279 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4280                 const struct nfs_open_context *ctx,
4281                 const struct nfs_lock_context *l_ctx,
4282                 fmode_t fmode)
4283 {
4284         const struct nfs_lockowner *lockowner = NULL;
4285
4286         if (l_ctx != NULL)
4287                 lockowner = &l_ctx->lockowner;
4288         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4289 }
4290 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4291
4292 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4293                 const struct nfs_open_context *ctx,
4294                 const struct nfs_lock_context *l_ctx,
4295                 fmode_t fmode)
4296 {
4297         nfs4_stateid current_stateid;
4298
4299         /* If the current stateid represents a lost lock, then exit */
4300         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4301                 return true;
4302         return nfs4_stateid_match(stateid, &current_stateid);
4303 }
4304
4305 static bool nfs4_error_stateid_expired(int err)
4306 {
4307         switch (err) {
4308         case -NFS4ERR_DELEG_REVOKED:
4309         case -NFS4ERR_ADMIN_REVOKED:
4310         case -NFS4ERR_BAD_STATEID:
4311         case -NFS4ERR_STALE_STATEID:
4312         case -NFS4ERR_OLD_STATEID:
4313         case -NFS4ERR_OPENMODE:
4314         case -NFS4ERR_EXPIRED:
4315                 return true;
4316         }
4317         return false;
4318 }
4319
4320 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4321 {
4322         nfs_invalidate_atime(hdr->inode);
4323 }
4324
4325 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4326 {
4327         struct nfs_server *server = NFS_SERVER(hdr->inode);
4328
4329         trace_nfs4_read(hdr, task->tk_status);
4330         if (nfs4_async_handle_error(task, server,
4331                                     hdr->args.context->state,
4332                                     NULL) == -EAGAIN) {
4333                 rpc_restart_call_prepare(task);
4334                 return -EAGAIN;
4335         }
4336
4337         __nfs4_read_done_cb(hdr);
4338         if (task->tk_status > 0)
4339                 renew_lease(server, hdr->timestamp);
4340         return 0;
4341 }
4342
4343 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4344                 struct nfs_pgio_args *args)
4345 {
4346
4347         if (!nfs4_error_stateid_expired(task->tk_status) ||
4348                 nfs4_stateid_is_current(&args->stateid,
4349                                 args->context,
4350                                 args->lock_context,
4351                                 FMODE_READ))
4352                 return false;
4353         rpc_restart_call_prepare(task);
4354         return true;
4355 }
4356
4357 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4358 {
4359
4360         dprintk("--> %s\n", __func__);
4361
4362         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4363                 return -EAGAIN;
4364         if (nfs4_read_stateid_changed(task, &hdr->args))
4365                 return -EAGAIN;
4366         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4367                                     nfs4_read_done_cb(task, hdr);
4368 }
4369
4370 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4371                                  struct rpc_message *msg)
4372 {
4373         hdr->timestamp   = jiffies;
4374         hdr->pgio_done_cb = nfs4_read_done_cb;
4375         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4376         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4377 }
4378
4379 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4380                                       struct nfs_pgio_header *hdr)
4381 {
4382         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4383                         &hdr->args.seq_args,
4384                         &hdr->res.seq_res,
4385                         task))
4386                 return 0;
4387         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4388                                 hdr->args.lock_context,
4389                                 hdr->rw_ops->rw_mode) == -EIO)
4390                 return -EIO;
4391         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4392                 return -EIO;
4393         return 0;
4394 }
4395
4396 static int nfs4_write_done_cb(struct rpc_task *task,
4397                               struct nfs_pgio_header *hdr)
4398 {
4399         struct inode *inode = hdr->inode;
4400
4401         trace_nfs4_write(hdr, task->tk_status);
4402         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4403                                     hdr->args.context->state,
4404                                     NULL) == -EAGAIN) {
4405                 rpc_restart_call_prepare(task);
4406                 return -EAGAIN;
4407         }
4408         if (task->tk_status >= 0) {
4409                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4410                 nfs_writeback_update_inode(hdr);
4411         }
4412         return 0;
4413 }
4414
4415 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4416                 struct nfs_pgio_args *args)
4417 {
4418
4419         if (!nfs4_error_stateid_expired(task->tk_status) ||
4420                 nfs4_stateid_is_current(&args->stateid,
4421                                 args->context,
4422                                 args->lock_context,
4423                                 FMODE_WRITE))
4424                 return false;
4425         rpc_restart_call_prepare(task);
4426         return true;
4427 }
4428
4429 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4430 {
4431         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4432                 return -EAGAIN;
4433         if (nfs4_write_stateid_changed(task, &hdr->args))
4434                 return -EAGAIN;
4435         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4436                 nfs4_write_done_cb(task, hdr);
4437 }
4438
4439 static
4440 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4441 {
4442         /* Don't request attributes for pNFS or O_DIRECT writes */
4443         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4444                 return false;
4445         /* Otherwise, request attributes if and only if we don't hold
4446          * a delegation
4447          */
4448         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4449 }
4450
4451 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4452                                   struct rpc_message *msg)
4453 {
4454         struct nfs_server *server = NFS_SERVER(hdr->inode);
4455
4456         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4457                 hdr->args.bitmask = NULL;
4458                 hdr->res.fattr = NULL;
4459         } else
4460                 hdr->args.bitmask = server->cache_consistency_bitmask;
4461
4462         if (!hdr->pgio_done_cb)
4463                 hdr->pgio_done_cb = nfs4_write_done_cb;
4464         hdr->res.server = server;
4465         hdr->timestamp   = jiffies;
4466
4467         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4468         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4469 }
4470
4471 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4472 {
4473         nfs4_setup_sequence(NFS_SERVER(data->inode),
4474                         &data->args.seq_args,
4475                         &data->res.seq_res,
4476                         task);
4477 }
4478
4479 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4480 {
4481         struct inode *inode = data->inode;
4482
4483         trace_nfs4_commit(data, task->tk_status);
4484         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4485                                     NULL, NULL) == -EAGAIN) {
4486                 rpc_restart_call_prepare(task);
4487                 return -EAGAIN;
4488         }
4489         return 0;
4490 }
4491
4492 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4493 {
4494         if (!nfs4_sequence_done(task, &data->res.seq_res))
4495                 return -EAGAIN;
4496         return data->commit_done_cb(task, data);
4497 }
4498
4499 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4500 {
4501         struct nfs_server *server = NFS_SERVER(data->inode);
4502
4503         if (data->commit_done_cb == NULL)
4504                 data->commit_done_cb = nfs4_commit_done_cb;
4505         data->res.server = server;
4506         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4507         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4508 }
4509
4510 struct nfs4_renewdata {
4511         struct nfs_client       *client;
4512         unsigned long           timestamp;
4513 };
4514
4515 /*
4516  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4517  * standalone procedure for queueing an asynchronous RENEW.
4518  */
4519 static void nfs4_renew_release(void *calldata)
4520 {
4521         struct nfs4_renewdata *data = calldata;
4522         struct nfs_client *clp = data->client;
4523
4524         if (atomic_read(&clp->cl_count) > 1)
4525                 nfs4_schedule_state_renewal(clp);
4526         nfs_put_client(clp);
4527         kfree(data);
4528 }
4529
4530 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4531 {
4532         struct nfs4_renewdata *data = calldata;
4533         struct nfs_client *clp = data->client;
4534         unsigned long timestamp = data->timestamp;
4535
4536         trace_nfs4_renew_async(clp, task->tk_status);
4537         switch (task->tk_status) {
4538         case 0:
4539                 break;
4540         case -NFS4ERR_LEASE_MOVED:
4541                 nfs4_schedule_lease_moved_recovery(clp);
4542                 break;
4543         default:
4544                 /* Unless we're shutting down, schedule state recovery! */
4545                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4546                         return;
4547                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4548                         nfs4_schedule_lease_recovery(clp);
4549                         return;
4550                 }
4551                 nfs4_schedule_path_down_recovery(clp);
4552         }
4553         do_renew_lease(clp, timestamp);
4554 }
4555
4556 static const struct rpc_call_ops nfs4_renew_ops = {
4557         .rpc_call_done = nfs4_renew_done,
4558         .rpc_release = nfs4_renew_release,
4559 };
4560
4561 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4562 {
4563         struct rpc_message msg = {
4564                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4565                 .rpc_argp       = clp,
4566                 .rpc_cred       = cred,
4567         };
4568         struct nfs4_renewdata *data;
4569
4570         if (renew_flags == 0)
4571                 return 0;
4572         if (!atomic_inc_not_zero(&clp->cl_count))
4573                 return -EIO;
4574         data = kmalloc(sizeof(*data), GFP_NOFS);
4575         if (data == NULL)
4576                 return -ENOMEM;
4577         data->client = clp;
4578         data->timestamp = jiffies;
4579         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4580                         &nfs4_renew_ops, data);
4581 }
4582
4583 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4584 {
4585         struct rpc_message msg = {
4586                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4587                 .rpc_argp       = clp,
4588                 .rpc_cred       = cred,
4589         };
4590         unsigned long now = jiffies;
4591         int status;
4592
4593         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4594         if (status < 0)
4595                 return status;
4596         do_renew_lease(clp, now);
4597         return 0;
4598 }
4599
4600 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4601 {
4602         return server->caps & NFS_CAP_ACLS;
4603 }
4604
4605 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4606  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4607  * the stack.
4608  */
4609 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4610
4611 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4612                 struct page **pages)
4613 {
4614         struct page *newpage, **spages;
4615         int rc = 0;
4616         size_t len;
4617         spages = pages;
4618
4619         do {
4620                 len = min_t(size_t, PAGE_SIZE, buflen);
4621                 newpage = alloc_page(GFP_KERNEL);
4622
4623                 if (newpage == NULL)
4624                         goto unwind;
4625                 memcpy(page_address(newpage), buf, len);
4626                 buf += len;
4627                 buflen -= len;
4628                 *pages++ = newpage;
4629                 rc++;
4630         } while (buflen != 0);
4631
4632         return rc;
4633
4634 unwind:
4635         for(; rc > 0; rc--)
4636                 __free_page(spages[rc-1]);
4637         return -ENOMEM;
4638 }
4639
4640 struct nfs4_cached_acl {
4641         int cached;
4642         size_t len;
4643         char data[0];
4644 };
4645
4646 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4647 {
4648         struct nfs_inode *nfsi = NFS_I(inode);
4649
4650         spin_lock(&inode->i_lock);
4651         kfree(nfsi->nfs4_acl);
4652         nfsi->nfs4_acl = acl;
4653         spin_unlock(&inode->i_lock);
4654 }
4655
4656 static void nfs4_zap_acl_attr(struct inode *inode)
4657 {
4658         nfs4_set_cached_acl(inode, NULL);
4659 }
4660
4661 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4662 {
4663         struct nfs_inode *nfsi = NFS_I(inode);
4664         struct nfs4_cached_acl *acl;
4665         int ret = -ENOENT;
4666
4667         spin_lock(&inode->i_lock);
4668         acl = nfsi->nfs4_acl;
4669         if (acl == NULL)
4670                 goto out;
4671         if (buf == NULL) /* user is just asking for length */
4672                 goto out_len;
4673         if (acl->cached == 0)
4674                 goto out;
4675         ret = -ERANGE; /* see getxattr(2) man page */
4676         if (acl->len > buflen)
4677                 goto out;
4678         memcpy(buf, acl->data, acl->len);
4679 out_len:
4680         ret = acl->len;
4681 out:
4682         spin_unlock(&inode->i_lock);
4683         return ret;
4684 }
4685
4686 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4687 {
4688         struct nfs4_cached_acl *acl;
4689         size_t buflen = sizeof(*acl) + acl_len;
4690
4691         if (buflen <= PAGE_SIZE) {
4692                 acl = kmalloc(buflen, GFP_KERNEL);
4693                 if (acl == NULL)
4694                         goto out;
4695                 acl->cached = 1;
4696                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4697         } else {
4698                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4699                 if (acl == NULL)
4700                         goto out;
4701                 acl->cached = 0;
4702         }
4703         acl->len = acl_len;
4704 out:
4705         nfs4_set_cached_acl(inode, acl);
4706 }
4707
4708 /*
4709  * The getxattr API returns the required buffer length when called with a
4710  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4711  * the required buf.  On a NULL buf, we send a page of data to the server
4712  * guessing that the ACL request can be serviced by a page. If so, we cache
4713  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4714  * the cache. If not so, we throw away the page, and cache the required
4715  * length. The next getxattr call will then produce another round trip to
4716  * the server, this time with the input buf of the required size.
4717  */
4718 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4719 {
4720         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4721         struct nfs_getaclargs args = {
4722                 .fh = NFS_FH(inode),
4723                 .acl_pages = pages,
4724                 .acl_len = buflen,
4725         };
4726         struct nfs_getaclres res = {
4727                 .acl_len = buflen,
4728         };
4729         struct rpc_message msg = {
4730                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4731                 .rpc_argp = &args,
4732                 .rpc_resp = &res,
4733         };
4734         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4735         int ret = -ENOMEM, i;
4736
4737         /* As long as we're doing a round trip to the server anyway,
4738          * let's be prepared for a page of acl data. */
4739         if (npages == 0)
4740                 npages = 1;
4741         if (npages > ARRAY_SIZE(pages))
4742                 return -ERANGE;
4743
4744         for (i = 0; i < npages; i++) {
4745                 pages[i] = alloc_page(GFP_KERNEL);
4746                 if (!pages[i])
4747                         goto out_free;
4748         }
4749
4750         /* for decoding across pages */
4751         res.acl_scratch = alloc_page(GFP_KERNEL);
4752         if (!res.acl_scratch)
4753                 goto out_free;
4754
4755         args.acl_len = npages * PAGE_SIZE;
4756
4757         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4758                 __func__, buf, buflen, npages, args.acl_len);
4759         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4760                              &msg, &args.seq_args, &res.seq_res, 0);
4761         if (ret)
4762                 goto out_free;
4763
4764         /* Handle the case where the passed-in buffer is too short */
4765         if (res.acl_flags & NFS4_ACL_TRUNC) {
4766                 /* Did the user only issue a request for the acl length? */
4767                 if (buf == NULL)
4768                         goto out_ok;
4769                 ret = -ERANGE;
4770                 goto out_free;
4771         }
4772         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4773         if (buf) {
4774                 if (res.acl_len > buflen) {
4775                         ret = -ERANGE;
4776                         goto out_free;
4777                 }
4778                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4779         }
4780 out_ok:
4781         ret = res.acl_len;
4782 out_free:
4783         for (i = 0; i < npages; i++)
4784                 if (pages[i])
4785                         __free_page(pages[i]);
4786         if (res.acl_scratch)
4787                 __free_page(res.acl_scratch);
4788         return ret;
4789 }
4790
4791 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4792 {
4793         struct nfs4_exception exception = { };
4794         ssize_t ret;
4795         do {
4796                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4797                 trace_nfs4_get_acl(inode, ret);
4798                 if (ret >= 0)
4799                         break;
4800                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4801         } while (exception.retry);
4802         return ret;
4803 }
4804
4805 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4806 {
4807         struct nfs_server *server = NFS_SERVER(inode);
4808         int ret;
4809
4810         if (!nfs4_server_supports_acls(server))
4811                 return -EOPNOTSUPP;
4812         ret = nfs_revalidate_inode(server, inode);
4813         if (ret < 0)
4814                 return ret;
4815         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4816                 nfs_zap_acl_cache(inode);
4817         ret = nfs4_read_cached_acl(inode, buf, buflen);
4818         if (ret != -ENOENT)
4819                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4820                  * but no cached acl data, just the acl length */
4821                 return ret;
4822         return nfs4_get_acl_uncached(inode, buf, buflen);
4823 }
4824
4825 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4826 {
4827         struct nfs_server *server = NFS_SERVER(inode);
4828         struct page *pages[NFS4ACL_MAXPAGES];
4829         struct nfs_setaclargs arg = {
4830                 .fh             = NFS_FH(inode),
4831                 .acl_pages      = pages,
4832                 .acl_len        = buflen,
4833         };
4834         struct nfs_setaclres res;
4835         struct rpc_message msg = {
4836                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4837                 .rpc_argp       = &arg,
4838                 .rpc_resp       = &res,
4839         };
4840         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4841         int ret, i;
4842
4843         if (!nfs4_server_supports_acls(server))
4844                 return -EOPNOTSUPP;
4845         if (npages > ARRAY_SIZE(pages))
4846                 return -ERANGE;
4847         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
4848         if (i < 0)
4849                 return i;
4850         nfs4_inode_return_delegation(inode);
4851         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4852
4853         /*
4854          * Free each page after tx, so the only ref left is
4855          * held by the network stack
4856          */
4857         for (; i > 0; i--)
4858                 put_page(pages[i-1]);
4859
4860         /*
4861          * Acl update can result in inode attribute update.
4862          * so mark the attribute cache invalid.
4863          */
4864         spin_lock(&inode->i_lock);
4865         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4866         spin_unlock(&inode->i_lock);
4867         nfs_access_zap_cache(inode);
4868         nfs_zap_acl_cache(inode);
4869         return ret;
4870 }
4871
4872 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4873 {
4874         struct nfs4_exception exception = { };
4875         int err;
4876         do {
4877                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4878                 trace_nfs4_set_acl(inode, err);
4879                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4880                                 &exception);
4881         } while (exception.retry);
4882         return err;
4883 }
4884
4885 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4886 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4887                                         size_t buflen)
4888 {
4889         struct nfs_server *server = NFS_SERVER(inode);
4890         struct nfs_fattr fattr;
4891         struct nfs4_label label = {0, 0, buflen, buf};
4892
4893         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4894         struct nfs4_getattr_arg arg = {
4895                 .fh             = NFS_FH(inode),
4896                 .bitmask        = bitmask,
4897         };
4898         struct nfs4_getattr_res res = {
4899                 .fattr          = &fattr,
4900                 .label          = &label,
4901                 .server         = server,
4902         };
4903         struct rpc_message msg = {
4904                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4905                 .rpc_argp       = &arg,
4906                 .rpc_resp       = &res,
4907         };
4908         int ret;
4909
4910         nfs_fattr_init(&fattr);
4911
4912         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4913         if (ret)
4914                 return ret;
4915         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4916                 return -ENOENT;
4917         if (buflen < label.len)
4918                 return -ERANGE;
4919         return 0;
4920 }
4921
4922 static int nfs4_get_security_label(struct inode *inode, void *buf,
4923                                         size_t buflen)
4924 {
4925         struct nfs4_exception exception = { };
4926         int err;
4927
4928         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4929                 return -EOPNOTSUPP;
4930
4931         do {
4932                 err = _nfs4_get_security_label(inode, buf, buflen);
4933                 trace_nfs4_get_security_label(inode, err);
4934                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4935                                 &exception);
4936         } while (exception.retry);
4937         return err;
4938 }
4939
4940 static int _nfs4_do_set_security_label(struct inode *inode,
4941                 struct nfs4_label *ilabel,
4942                 struct nfs_fattr *fattr,
4943                 struct nfs4_label *olabel)
4944 {
4945
4946         struct iattr sattr = {0};
4947         struct nfs_server *server = NFS_SERVER(inode);
4948         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4949         struct nfs_setattrargs arg = {
4950                 .fh             = NFS_FH(inode),
4951                 .iap            = &sattr,
4952                 .server         = server,
4953                 .bitmask        = bitmask,
4954                 .label          = ilabel,
4955         };
4956         struct nfs_setattrres res = {
4957                 .fattr          = fattr,
4958                 .label          = olabel,
4959                 .server         = server,
4960         };
4961         struct rpc_message msg = {
4962                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4963                 .rpc_argp       = &arg,
4964                 .rpc_resp       = &res,
4965         };
4966         int status;
4967
4968         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4969
4970         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4971         if (status)
4972                 dprintk("%s failed: %d\n", __func__, status);
4973
4974         return status;
4975 }
4976
4977 static int nfs4_do_set_security_label(struct inode *inode,
4978                 struct nfs4_label *ilabel,
4979                 struct nfs_fattr *fattr,
4980                 struct nfs4_label *olabel)
4981 {
4982         struct nfs4_exception exception = { };
4983         int err;
4984
4985         do {
4986                 err = _nfs4_do_set_security_label(inode, ilabel,
4987                                 fattr, olabel);
4988                 trace_nfs4_set_security_label(inode, err);
4989                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4990                                 &exception);
4991         } while (exception.retry);
4992         return err;
4993 }
4994
4995 static int
4996 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4997 {
4998         struct nfs4_label ilabel, *olabel = NULL;
4999         struct nfs_fattr fattr;
5000         struct rpc_cred *cred;
5001         struct inode *inode = d_inode(dentry);
5002         int status;
5003
5004         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5005                 return -EOPNOTSUPP;
5006
5007         nfs_fattr_init(&fattr);
5008
5009         ilabel.pi = 0;
5010         ilabel.lfs = 0;
5011         ilabel.label = (char *)buf;
5012         ilabel.len = buflen;
5013
5014         cred = rpc_lookup_cred();
5015         if (IS_ERR(cred))
5016                 return PTR_ERR(cred);
5017
5018         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5019         if (IS_ERR(olabel)) {
5020                 status = -PTR_ERR(olabel);
5021                 goto out;
5022         }
5023
5024         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5025         if (status == 0)
5026                 nfs_setsecurity(inode, &fattr, olabel);
5027
5028         nfs4_label_free(olabel);
5029 out:
5030         put_rpccred(cred);
5031         return status;
5032 }
5033 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5034
5035
5036 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5037                                     nfs4_verifier *bootverf)
5038 {
5039         __be32 verf[2];
5040
5041         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5042                 /* An impossible timestamp guarantees this value
5043                  * will never match a generated boot time. */
5044                 verf[0] = 0;
5045                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
5046         } else {
5047                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5048                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
5049                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
5050         }
5051         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5052 }
5053
5054 static int
5055 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5056 {
5057         size_t len;
5058         char *str;
5059
5060         if (clp->cl_owner_id != NULL)
5061                 return 0;
5062
5063         rcu_read_lock();
5064         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5065                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5066                 1 +
5067                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5068                 1;
5069         rcu_read_unlock();
5070
5071         if (len > NFS4_OPAQUE_LIMIT + 1)
5072                 return -EINVAL;
5073
5074         /*
5075          * Since this string is allocated at mount time, and held until the
5076          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5077          * about a memory-reclaim deadlock.
5078          */
5079         str = kmalloc(len, GFP_KERNEL);
5080         if (!str)
5081                 return -ENOMEM;
5082
5083         rcu_read_lock();
5084         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5085                         clp->cl_ipaddr,
5086                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5087                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5088         rcu_read_unlock();
5089
5090         clp->cl_owner_id = str;
5091         return 0;
5092 }
5093
5094 static int
5095 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5096 {
5097         size_t len;
5098         char *str;
5099
5100         len = 10 + 10 + 1 + 10 + 1 +
5101                 strlen(nfs4_client_id_uniquifier) + 1 +
5102                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5103
5104         if (len > NFS4_OPAQUE_LIMIT + 1)
5105                 return -EINVAL;
5106
5107         /*
5108          * Since this string is allocated at mount time, and held until the
5109          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5110          * about a memory-reclaim deadlock.
5111          */
5112         str = kmalloc(len, GFP_KERNEL);
5113         if (!str)
5114                 return -ENOMEM;
5115
5116         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5117                         clp->rpc_ops->version, clp->cl_minorversion,
5118                         nfs4_client_id_uniquifier,
5119                         clp->cl_rpcclient->cl_nodename);
5120         clp->cl_owner_id = str;
5121         return 0;
5122 }
5123
5124 static int
5125 nfs4_init_uniform_client_string(struct nfs_client *clp)
5126 {
5127         size_t len;
5128         char *str;
5129
5130         if (clp->cl_owner_id != NULL)
5131                 return 0;
5132
5133         if (nfs4_client_id_uniquifier[0] != '\0')
5134                 return nfs4_init_uniquifier_client_string(clp);
5135
5136         len = 10 + 10 + 1 + 10 + 1 +
5137                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5138
5139         if (len > NFS4_OPAQUE_LIMIT + 1)
5140                 return -EINVAL;
5141
5142         /*
5143          * Since this string is allocated at mount time, and held until the
5144          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5145          * about a memory-reclaim deadlock.
5146          */
5147         str = kmalloc(len, GFP_KERNEL);
5148         if (!str)
5149                 return -ENOMEM;
5150
5151         scnprintf(str, len, "Linux NFSv%u.%u %s",
5152                         clp->rpc_ops->version, clp->cl_minorversion,
5153                         clp->cl_rpcclient->cl_nodename);
5154         clp->cl_owner_id = str;
5155         return 0;
5156 }
5157
5158 /*
5159  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5160  * services.  Advertise one based on the address family of the
5161  * clientaddr.
5162  */
5163 static unsigned int
5164 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5165 {
5166         if (strchr(clp->cl_ipaddr, ':') != NULL)
5167                 return scnprintf(buf, len, "tcp6");
5168         else
5169                 return scnprintf(buf, len, "tcp");
5170 }
5171
5172 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5173 {
5174         struct nfs4_setclientid *sc = calldata;
5175
5176         if (task->tk_status == 0)
5177                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5178 }
5179
5180 static const struct rpc_call_ops nfs4_setclientid_ops = {
5181         .rpc_call_done = nfs4_setclientid_done,
5182 };
5183
5184 /**
5185  * nfs4_proc_setclientid - Negotiate client ID
5186  * @clp: state data structure
5187  * @program: RPC program for NFSv4 callback service
5188  * @port: IP port number for NFS4 callback service
5189  * @cred: RPC credential to use for this call
5190  * @res: where to place the result
5191  *
5192  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5193  */
5194 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5195                 unsigned short port, struct rpc_cred *cred,
5196                 struct nfs4_setclientid_res *res)
5197 {
5198         nfs4_verifier sc_verifier;
5199         struct nfs4_setclientid setclientid = {
5200                 .sc_verifier = &sc_verifier,
5201                 .sc_prog = program,
5202                 .sc_clnt = clp,
5203         };
5204         struct rpc_message msg = {
5205                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5206                 .rpc_argp = &setclientid,
5207                 .rpc_resp = res,
5208                 .rpc_cred = cred,
5209         };
5210         struct rpc_task *task;
5211         struct rpc_task_setup task_setup_data = {
5212                 .rpc_client = clp->cl_rpcclient,
5213                 .rpc_message = &msg,
5214                 .callback_ops = &nfs4_setclientid_ops,
5215                 .callback_data = &setclientid,
5216                 .flags = RPC_TASK_TIMEOUT,
5217         };
5218         int status;
5219
5220         /* nfs_client_id4 */
5221         nfs4_init_boot_verifier(clp, &sc_verifier);
5222
5223         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5224                 status = nfs4_init_uniform_client_string(clp);
5225         else
5226                 status = nfs4_init_nonuniform_client_string(clp);
5227
5228         if (status)
5229                 goto out;
5230
5231         /* cb_client4 */
5232         setclientid.sc_netid_len =
5233                                 nfs4_init_callback_netid(clp,
5234                                                 setclientid.sc_netid,
5235                                                 sizeof(setclientid.sc_netid));
5236         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5237                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5238                                 clp->cl_ipaddr, port >> 8, port & 255);
5239
5240         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5241                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5242                 clp->cl_owner_id);
5243         task = rpc_run_task(&task_setup_data);
5244         if (IS_ERR(task)) {
5245                 status = PTR_ERR(task);
5246                 goto out;
5247         }
5248         status = task->tk_status;
5249         if (setclientid.sc_cred) {
5250                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5251                 put_rpccred(setclientid.sc_cred);
5252         }
5253         rpc_put_task(task);
5254 out:
5255         trace_nfs4_setclientid(clp, status);
5256         dprintk("NFS reply setclientid: %d\n", status);
5257         return status;
5258 }
5259
5260 /**
5261  * nfs4_proc_setclientid_confirm - Confirm client ID
5262  * @clp: state data structure
5263  * @res: result of a previous SETCLIENTID
5264  * @cred: RPC credential to use for this call
5265  *
5266  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5267  */
5268 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5269                 struct nfs4_setclientid_res *arg,
5270                 struct rpc_cred *cred)
5271 {
5272         struct rpc_message msg = {
5273                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5274                 .rpc_argp = arg,
5275                 .rpc_cred = cred,
5276         };
5277         int status;
5278
5279         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5280                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5281                 clp->cl_clientid);
5282         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5283         trace_nfs4_setclientid_confirm(clp, status);
5284         dprintk("NFS reply setclientid_confirm: %d\n", status);
5285         return status;
5286 }
5287
5288 struct nfs4_delegreturndata {
5289         struct nfs4_delegreturnargs args;
5290         struct nfs4_delegreturnres res;
5291         struct nfs_fh fh;
5292         nfs4_stateid stateid;
5293         unsigned long timestamp;
5294         struct nfs_fattr fattr;
5295         int rpc_status;
5296         struct inode *inode;
5297         bool roc;
5298         u32 roc_barrier;
5299 };
5300
5301 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5302 {
5303         struct nfs4_delegreturndata *data = calldata;
5304
5305         if (!nfs4_sequence_done(task, &data->res.seq_res))
5306                 return;
5307
5308         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5309         switch (task->tk_status) {
5310         case 0:
5311                 renew_lease(data->res.server, data->timestamp);
5312         case -NFS4ERR_ADMIN_REVOKED:
5313         case -NFS4ERR_DELEG_REVOKED:
5314         case -NFS4ERR_BAD_STATEID:
5315         case -NFS4ERR_OLD_STATEID:
5316         case -NFS4ERR_STALE_STATEID:
5317         case -NFS4ERR_EXPIRED:
5318                 task->tk_status = 0;
5319                 if (data->roc)
5320                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5321                 break;
5322         default:
5323                 if (nfs4_async_handle_error(task, data->res.server,
5324                                             NULL, NULL) == -EAGAIN) {
5325                         rpc_restart_call_prepare(task);
5326                         return;
5327                 }
5328         }
5329         data->rpc_status = task->tk_status;
5330 }
5331
5332 static void nfs4_delegreturn_release(void *calldata)
5333 {
5334         struct nfs4_delegreturndata *data = calldata;
5335         struct inode *inode = data->inode;
5336
5337         if (inode) {
5338                 if (data->roc)
5339                         pnfs_roc_release(inode);
5340                 nfs_iput_and_deactive(inode);
5341         }
5342         kfree(calldata);
5343 }
5344
5345 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5346 {
5347         struct nfs4_delegreturndata *d_data;
5348
5349         d_data = (struct nfs4_delegreturndata *)data;
5350
5351         if (nfs4_wait_on_layoutreturn(d_data->inode, task))
5352                 return;
5353
5354         if (d_data->roc)
5355                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5356
5357         nfs4_setup_sequence(d_data->res.server,
5358                         &d_data->args.seq_args,
5359                         &d_data->res.seq_res,
5360                         task);
5361 }
5362
5363 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5364         .rpc_call_prepare = nfs4_delegreturn_prepare,
5365         .rpc_call_done = nfs4_delegreturn_done,
5366         .rpc_release = nfs4_delegreturn_release,
5367 };
5368
5369 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5370 {
5371         struct nfs4_delegreturndata *data;
5372         struct nfs_server *server = NFS_SERVER(inode);
5373         struct rpc_task *task;
5374         struct rpc_message msg = {
5375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5376                 .rpc_cred = cred,
5377         };
5378         struct rpc_task_setup task_setup_data = {
5379                 .rpc_client = server->client,
5380                 .rpc_message = &msg,
5381                 .callback_ops = &nfs4_delegreturn_ops,
5382                 .flags = RPC_TASK_ASYNC,
5383         };
5384         int status = 0;
5385
5386         data = kzalloc(sizeof(*data), GFP_NOFS);
5387         if (data == NULL)
5388                 return -ENOMEM;
5389         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5390
5391         nfs4_state_protect(server->nfs_client,
5392                         NFS_SP4_MACH_CRED_CLEANUP,
5393                         &task_setup_data.rpc_client, &msg);
5394
5395         data->args.fhandle = &data->fh;
5396         data->args.stateid = &data->stateid;
5397         data->args.bitmask = server->cache_consistency_bitmask;
5398         nfs_copy_fh(&data->fh, NFS_FH(inode));
5399         nfs4_stateid_copy(&data->stateid, stateid);
5400         data->res.fattr = &data->fattr;
5401         data->res.server = server;
5402         nfs_fattr_init(data->res.fattr);
5403         data->timestamp = jiffies;
5404         data->rpc_status = 0;
5405         data->inode = nfs_igrab_and_active(inode);
5406         if (data->inode)
5407                 data->roc = nfs4_roc(inode);
5408
5409         task_setup_data.callback_data = data;
5410         msg.rpc_argp = &data->args;
5411         msg.rpc_resp = &data->res;
5412         task = rpc_run_task(&task_setup_data);
5413         if (IS_ERR(task))
5414                 return PTR_ERR(task);
5415         if (!issync)
5416                 goto out;
5417         status = nfs4_wait_for_completion_rpc_task(task);
5418         if (status != 0)
5419                 goto out;
5420         status = data->rpc_status;
5421         if (status == 0)
5422                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5423         else
5424                 nfs_refresh_inode(inode, &data->fattr);
5425 out:
5426         rpc_put_task(task);
5427         return status;
5428 }
5429
5430 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5431 {
5432         struct nfs_server *server = NFS_SERVER(inode);
5433         struct nfs4_exception exception = { };
5434         int err;
5435         do {
5436                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5437                 trace_nfs4_delegreturn(inode, stateid, err);
5438                 switch (err) {
5439                         case -NFS4ERR_STALE_STATEID:
5440                         case -NFS4ERR_EXPIRED:
5441                         case 0:
5442                                 return 0;
5443                 }
5444                 err = nfs4_handle_exception(server, err, &exception);
5445         } while (exception.retry);
5446         return err;
5447 }
5448
5449 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5450 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5451
5452 /*
5453  * sleep, with exponential backoff, and retry the LOCK operation.
5454  */
5455 static unsigned long
5456 nfs4_set_lock_task_retry(unsigned long timeout)
5457 {
5458         freezable_schedule_timeout_killable_unsafe(timeout);
5459         timeout <<= 1;
5460         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5461                 return NFS4_LOCK_MAXTIMEOUT;
5462         return timeout;
5463 }
5464
5465 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5466 {
5467         struct inode *inode = state->inode;
5468         struct nfs_server *server = NFS_SERVER(inode);
5469         struct nfs_client *clp = server->nfs_client;
5470         struct nfs_lockt_args arg = {
5471                 .fh = NFS_FH(inode),
5472                 .fl = request,
5473         };
5474         struct nfs_lockt_res res = {
5475                 .denied = request,
5476         };
5477         struct rpc_message msg = {
5478                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5479                 .rpc_argp       = &arg,
5480                 .rpc_resp       = &res,
5481                 .rpc_cred       = state->owner->so_cred,
5482         };
5483         struct nfs4_lock_state *lsp;
5484         int status;
5485
5486         arg.lock_owner.clientid = clp->cl_clientid;
5487         status = nfs4_set_lock_state(state, request);
5488         if (status != 0)
5489                 goto out;
5490         lsp = request->fl_u.nfs4_fl.owner;
5491         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5492         arg.lock_owner.s_dev = server->s_dev;
5493         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5494         switch (status) {
5495                 case 0:
5496                         request->fl_type = F_UNLCK;
5497                         break;
5498                 case -NFS4ERR_DENIED:
5499                         status = 0;
5500         }
5501         request->fl_ops->fl_release_private(request);
5502         request->fl_ops = NULL;
5503 out:
5504         return status;
5505 }
5506
5507 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5508 {
5509         struct nfs4_exception exception = { };
5510         int err;
5511
5512         do {
5513                 err = _nfs4_proc_getlk(state, cmd, request);
5514                 trace_nfs4_get_lock(request, state, cmd, err);
5515                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5516                                 &exception);
5517         } while (exception.retry);
5518         return err;
5519 }
5520
5521 static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
5522 {
5523         return locks_lock_inode_wait(inode, fl);
5524 }
5525
5526 struct nfs4_unlockdata {
5527         struct nfs_locku_args arg;
5528         struct nfs_locku_res res;
5529         struct nfs4_lock_state *lsp;
5530         struct nfs_open_context *ctx;
5531         struct file_lock fl;
5532         struct nfs_server *server;
5533         unsigned long timestamp;
5534 };
5535
5536 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5537                 struct nfs_open_context *ctx,
5538                 struct nfs4_lock_state *lsp,
5539                 struct nfs_seqid *seqid)
5540 {
5541         struct nfs4_unlockdata *p;
5542         struct inode *inode = lsp->ls_state->inode;
5543
5544         p = kzalloc(sizeof(*p), GFP_NOFS);
5545         if (p == NULL)
5546                 return NULL;
5547         p->arg.fh = NFS_FH(inode);
5548         p->arg.fl = &p->fl;
5549         p->arg.seqid = seqid;
5550         p->res.seqid = seqid;
5551         p->lsp = lsp;
5552         atomic_inc(&lsp->ls_count);
5553         /* Ensure we don't close file until we're done freeing locks! */
5554         p->ctx = get_nfs_open_context(ctx);
5555         memcpy(&p->fl, fl, sizeof(p->fl));
5556         p->server = NFS_SERVER(inode);
5557         return p;
5558 }
5559
5560 static void nfs4_locku_release_calldata(void *data)
5561 {
5562         struct nfs4_unlockdata *calldata = data;
5563         nfs_free_seqid(calldata->arg.seqid);
5564         nfs4_put_lock_state(calldata->lsp);
5565         put_nfs_open_context(calldata->ctx);
5566         kfree(calldata);
5567 }
5568
5569 static void nfs4_locku_done(struct rpc_task *task, void *data)
5570 {
5571         struct nfs4_unlockdata *calldata = data;
5572
5573         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5574                 return;
5575         switch (task->tk_status) {
5576                 case 0:
5577                         renew_lease(calldata->server, calldata->timestamp);
5578                         do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5579                         if (nfs4_update_lock_stateid(calldata->lsp,
5580                                         &calldata->res.stateid))
5581                                 break;
5582                 case -NFS4ERR_BAD_STATEID:
5583                 case -NFS4ERR_OLD_STATEID:
5584                 case -NFS4ERR_STALE_STATEID:
5585                 case -NFS4ERR_EXPIRED:
5586                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5587                                                 &calldata->lsp->ls_stateid))
5588                                 rpc_restart_call_prepare(task);
5589                         break;
5590                 default:
5591                         if (nfs4_async_handle_error(task, calldata->server,
5592                                                     NULL, NULL) == -EAGAIN)
5593                                 rpc_restart_call_prepare(task);
5594         }
5595         nfs_release_seqid(calldata->arg.seqid);
5596 }
5597
5598 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5599 {
5600         struct nfs4_unlockdata *calldata = data;
5601
5602         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5603                 goto out_wait;
5604         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5605         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5606                 /* Note: exit _without_ running nfs4_locku_done */
5607                 goto out_no_action;
5608         }
5609         calldata->timestamp = jiffies;
5610         if (nfs4_setup_sequence(calldata->server,
5611                                 &calldata->arg.seq_args,
5612                                 &calldata->res.seq_res,
5613                                 task) != 0)
5614                 nfs_release_seqid(calldata->arg.seqid);
5615         return;
5616 out_no_action:
5617         task->tk_action = NULL;
5618 out_wait:
5619         nfs4_sequence_done(task, &calldata->res.seq_res);
5620 }
5621
5622 static const struct rpc_call_ops nfs4_locku_ops = {
5623         .rpc_call_prepare = nfs4_locku_prepare,
5624         .rpc_call_done = nfs4_locku_done,
5625         .rpc_release = nfs4_locku_release_calldata,
5626 };
5627
5628 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5629                 struct nfs_open_context *ctx,
5630                 struct nfs4_lock_state *lsp,
5631                 struct nfs_seqid *seqid)
5632 {
5633         struct nfs4_unlockdata *data;
5634         struct rpc_message msg = {
5635                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5636                 .rpc_cred = ctx->cred,
5637         };
5638         struct rpc_task_setup task_setup_data = {
5639                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5640                 .rpc_message = &msg,
5641                 .callback_ops = &nfs4_locku_ops,
5642                 .workqueue = nfsiod_workqueue,
5643                 .flags = RPC_TASK_ASYNC,
5644         };
5645
5646         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5647                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5648
5649         /* Ensure this is an unlock - when canceling a lock, the
5650          * canceled lock is passed in, and it won't be an unlock.
5651          */
5652         fl->fl_type = F_UNLCK;
5653
5654         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5655         if (data == NULL) {
5656                 nfs_free_seqid(seqid);
5657                 return ERR_PTR(-ENOMEM);
5658         }
5659
5660         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5661         msg.rpc_argp = &data->arg;
5662         msg.rpc_resp = &data->res;
5663         task_setup_data.callback_data = data;
5664         return rpc_run_task(&task_setup_data);
5665 }
5666
5667 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5668 {
5669         struct inode *inode = state->inode;
5670         struct nfs4_state_owner *sp = state->owner;
5671         struct nfs_inode *nfsi = NFS_I(inode);
5672         struct nfs_seqid *seqid;
5673         struct nfs4_lock_state *lsp;
5674         struct rpc_task *task;
5675         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5676         int status = 0;
5677         unsigned char fl_flags = request->fl_flags;
5678
5679         status = nfs4_set_lock_state(state, request);
5680         /* Unlock _before_ we do the RPC call */
5681         request->fl_flags |= FL_EXISTS;
5682         /* Exclude nfs_delegation_claim_locks() */
5683         mutex_lock(&sp->so_delegreturn_mutex);
5684         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5685         down_read(&nfsi->rwsem);
5686         if (do_vfs_lock(inode, request) == -ENOENT) {
5687                 up_read(&nfsi->rwsem);
5688                 mutex_unlock(&sp->so_delegreturn_mutex);
5689                 goto out;
5690         }
5691         up_read(&nfsi->rwsem);
5692         mutex_unlock(&sp->so_delegreturn_mutex);
5693         if (status != 0)
5694                 goto out;
5695         /* Is this a delegated lock? */
5696         lsp = request->fl_u.nfs4_fl.owner;
5697         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5698                 goto out;
5699         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5700         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5701         status = -ENOMEM;
5702         if (IS_ERR(seqid))
5703                 goto out;
5704         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5705         status = PTR_ERR(task);
5706         if (IS_ERR(task))
5707                 goto out;
5708         status = nfs4_wait_for_completion_rpc_task(task);
5709         rpc_put_task(task);
5710 out:
5711         request->fl_flags = fl_flags;
5712         trace_nfs4_unlock(request, state, F_SETLK, status);
5713         return status;
5714 }
5715
5716 struct nfs4_lockdata {
5717         struct nfs_lock_args arg;
5718         struct nfs_lock_res res;
5719         struct nfs4_lock_state *lsp;
5720         struct nfs_open_context *ctx;
5721         struct file_lock fl;
5722         unsigned long timestamp;
5723         int rpc_status;
5724         int cancelled;
5725         struct nfs_server *server;
5726 };
5727
5728 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5729                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5730                 gfp_t gfp_mask)
5731 {
5732         struct nfs4_lockdata *p;
5733         struct inode *inode = lsp->ls_state->inode;
5734         struct nfs_server *server = NFS_SERVER(inode);
5735         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5736
5737         p = kzalloc(sizeof(*p), gfp_mask);
5738         if (p == NULL)
5739                 return NULL;
5740
5741         p->arg.fh = NFS_FH(inode);
5742         p->arg.fl = &p->fl;
5743         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5744         if (IS_ERR(p->arg.open_seqid))
5745                 goto out_free;
5746         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5747         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5748         if (IS_ERR(p->arg.lock_seqid))
5749                 goto out_free_seqid;
5750         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5751         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5752         p->arg.lock_owner.s_dev = server->s_dev;
5753         p->res.lock_seqid = p->arg.lock_seqid;
5754         p->lsp = lsp;
5755         p->server = server;
5756         atomic_inc(&lsp->ls_count);
5757         p->ctx = get_nfs_open_context(ctx);
5758         get_file(fl->fl_file);
5759         memcpy(&p->fl, fl, sizeof(p->fl));
5760         return p;
5761 out_free_seqid:
5762         nfs_free_seqid(p->arg.open_seqid);
5763 out_free:
5764         kfree(p);
5765         return NULL;
5766 }
5767
5768 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5769 {
5770         struct nfs4_lockdata *data = calldata;
5771         struct nfs4_state *state = data->lsp->ls_state;
5772
5773         dprintk("%s: begin!\n", __func__);
5774         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5775                 goto out_wait;
5776         /* Do we need to do an open_to_lock_owner? */
5777         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5778                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5779                         goto out_release_lock_seqid;
5780                 }
5781                 nfs4_stateid_copy(&data->arg.open_stateid,
5782                                 &state->open_stateid);
5783                 data->arg.new_lock_owner = 1;
5784                 data->res.open_seqid = data->arg.open_seqid;
5785         } else {
5786                 data->arg.new_lock_owner = 0;
5787                 nfs4_stateid_copy(&data->arg.lock_stateid,
5788                                 &data->lsp->ls_stateid);
5789         }
5790         if (!nfs4_valid_open_stateid(state)) {
5791                 data->rpc_status = -EBADF;
5792                 task->tk_action = NULL;
5793                 goto out_release_open_seqid;
5794         }
5795         data->timestamp = jiffies;
5796         if (nfs4_setup_sequence(data->server,
5797                                 &data->arg.seq_args,
5798                                 &data->res.seq_res,
5799                                 task) == 0)
5800                 return;
5801 out_release_open_seqid:
5802         nfs_release_seqid(data->arg.open_seqid);
5803 out_release_lock_seqid:
5804         nfs_release_seqid(data->arg.lock_seqid);
5805 out_wait:
5806         nfs4_sequence_done(task, &data->res.seq_res);
5807         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5808 }
5809
5810 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5811 {
5812         struct nfs4_lockdata *data = calldata;
5813         struct nfs4_lock_state *lsp = data->lsp;
5814
5815         dprintk("%s: begin!\n", __func__);
5816
5817         if (!nfs4_sequence_done(task, &data->res.seq_res))
5818                 return;
5819
5820         data->rpc_status = task->tk_status;
5821         switch (task->tk_status) {
5822         case 0:
5823                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5824                                 data->timestamp);
5825                 if (data->arg.new_lock) {
5826                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5827                         if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5828                                 rpc_restart_call_prepare(task);
5829                                 break;
5830                         }
5831                 }
5832                 if (data->arg.new_lock_owner != 0) {
5833                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5834                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5835                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5836                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5837                         rpc_restart_call_prepare(task);
5838                 break;
5839         case -NFS4ERR_BAD_STATEID:
5840         case -NFS4ERR_OLD_STATEID:
5841         case -NFS4ERR_STALE_STATEID:
5842         case -NFS4ERR_EXPIRED:
5843                 if (data->arg.new_lock_owner != 0) {
5844                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5845                                                 &lsp->ls_state->open_stateid))
5846                                 rpc_restart_call_prepare(task);
5847                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5848                                                 &lsp->ls_stateid))
5849                                 rpc_restart_call_prepare(task);
5850         }
5851         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5852 }
5853
5854 static void nfs4_lock_release(void *calldata)
5855 {
5856         struct nfs4_lockdata *data = calldata;
5857
5858         dprintk("%s: begin!\n", __func__);
5859         nfs_free_seqid(data->arg.open_seqid);
5860         if (data->cancelled != 0) {
5861                 struct rpc_task *task;
5862                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5863                                 data->arg.lock_seqid);
5864                 if (!IS_ERR(task))
5865                         rpc_put_task_async(task);
5866                 dprintk("%s: cancelling lock!\n", __func__);
5867         } else
5868                 nfs_free_seqid(data->arg.lock_seqid);
5869         nfs4_put_lock_state(data->lsp);
5870         put_nfs_open_context(data->ctx);
5871         fput(data->fl.fl_file);
5872         kfree(data);
5873         dprintk("%s: done!\n", __func__);
5874 }
5875
5876 static const struct rpc_call_ops nfs4_lock_ops = {
5877         .rpc_call_prepare = nfs4_lock_prepare,
5878         .rpc_call_done = nfs4_lock_done,
5879         .rpc_release = nfs4_lock_release,
5880 };
5881
5882 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5883 {
5884         switch (error) {
5885         case -NFS4ERR_ADMIN_REVOKED:
5886         case -NFS4ERR_BAD_STATEID:
5887                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5888                 if (new_lock_owner != 0 ||
5889                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5890                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5891                 break;
5892         case -NFS4ERR_STALE_STATEID:
5893                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5894         case -NFS4ERR_EXPIRED:
5895                 nfs4_schedule_lease_recovery(server->nfs_client);
5896         };
5897 }
5898
5899 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5900 {
5901         struct nfs4_lockdata *data;
5902         struct rpc_task *task;
5903         struct rpc_message msg = {
5904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5905                 .rpc_cred = state->owner->so_cred,
5906         };
5907         struct rpc_task_setup task_setup_data = {
5908                 .rpc_client = NFS_CLIENT(state->inode),
5909                 .rpc_message = &msg,
5910                 .callback_ops = &nfs4_lock_ops,
5911                 .workqueue = nfsiod_workqueue,
5912                 .flags = RPC_TASK_ASYNC,
5913         };
5914         int ret;
5915
5916         dprintk("%s: begin!\n", __func__);
5917         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5918                         fl->fl_u.nfs4_fl.owner,
5919                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5920         if (data == NULL)
5921                 return -ENOMEM;
5922         if (IS_SETLKW(cmd))
5923                 data->arg.block = 1;
5924         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5925         msg.rpc_argp = &data->arg;
5926         msg.rpc_resp = &data->res;
5927         task_setup_data.callback_data = data;
5928         if (recovery_type > NFS_LOCK_NEW) {
5929                 if (recovery_type == NFS_LOCK_RECLAIM)
5930                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5931                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5932         } else
5933                 data->arg.new_lock = 1;
5934         task = rpc_run_task(&task_setup_data);
5935         if (IS_ERR(task))
5936                 return PTR_ERR(task);
5937         ret = nfs4_wait_for_completion_rpc_task(task);
5938         if (ret == 0) {
5939                 ret = data->rpc_status;
5940                 if (ret)
5941                         nfs4_handle_setlk_error(data->server, data->lsp,
5942                                         data->arg.new_lock_owner, ret);
5943         } else
5944                 data->cancelled = 1;
5945         rpc_put_task(task);
5946         dprintk("%s: done, ret = %d!\n", __func__, ret);
5947         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
5948         return ret;
5949 }
5950
5951 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5952 {
5953         struct nfs_server *server = NFS_SERVER(state->inode);
5954         struct nfs4_exception exception = {
5955                 .inode = state->inode,
5956         };
5957         int err;
5958
5959         do {
5960                 /* Cache the lock if possible... */
5961                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5962                         return 0;
5963                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5964                 if (err != -NFS4ERR_DELAY)
5965                         break;
5966                 nfs4_handle_exception(server, err, &exception);
5967         } while (exception.retry);
5968         return err;
5969 }
5970
5971 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5972 {
5973         struct nfs_server *server = NFS_SERVER(state->inode);
5974         struct nfs4_exception exception = {
5975                 .inode = state->inode,
5976         };
5977         int err;
5978
5979         err = nfs4_set_lock_state(state, request);
5980         if (err != 0)
5981                 return err;
5982         if (!recover_lost_locks) {
5983                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5984                 return 0;
5985         }
5986         do {
5987                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5988                         return 0;
5989                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5990                 switch (err) {
5991                 default:
5992                         goto out;
5993                 case -NFS4ERR_GRACE:
5994                 case -NFS4ERR_DELAY:
5995                         nfs4_handle_exception(server, err, &exception);
5996                         err = 0;
5997                 }
5998         } while (exception.retry);
5999 out:
6000         return err;
6001 }
6002
6003 #if defined(CONFIG_NFS_V4_1)
6004 /**
6005  * nfs41_check_expired_locks - possibly free a lock stateid
6006  *
6007  * @state: NFSv4 state for an inode
6008  *
6009  * Returns NFS_OK if recovery for this stateid is now finished.
6010  * Otherwise a negative NFS4ERR value is returned.
6011  */
6012 static int nfs41_check_expired_locks(struct nfs4_state *state)
6013 {
6014         int status, ret = -NFS4ERR_BAD_STATEID;
6015         struct nfs4_lock_state *lsp;
6016         struct nfs_server *server = NFS_SERVER(state->inode);
6017
6018         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
6019                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
6020                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
6021
6022                         status = nfs41_test_stateid(server,
6023                                         &lsp->ls_stateid,
6024                                         cred);
6025                         trace_nfs4_test_lock_stateid(state, lsp, status);
6026                         if (status != NFS_OK) {
6027                                 /* Free the stateid unless the server
6028                                  * informs us the stateid is unrecognized. */
6029                                 if (status != -NFS4ERR_BAD_STATEID)
6030                                         nfs41_free_stateid(server,
6031                                                         &lsp->ls_stateid,
6032                                                         cred);
6033                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6034                                 ret = status;
6035                         }
6036                 }
6037         };
6038
6039         return ret;
6040 }
6041
6042 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6043 {
6044         int status = NFS_OK;
6045
6046         if (test_bit(LK_STATE_IN_USE, &state->flags))
6047                 status = nfs41_check_expired_locks(state);
6048         if (status != NFS_OK)
6049                 status = nfs4_lock_expired(state, request);
6050         return status;
6051 }
6052 #endif
6053
6054 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6055 {
6056         struct nfs_inode *nfsi = NFS_I(state->inode);
6057         unsigned char fl_flags = request->fl_flags;
6058         int status = -ENOLCK;
6059
6060         if ((fl_flags & FL_POSIX) &&
6061                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6062                 goto out;
6063         /* Is this a delegated open? */
6064         status = nfs4_set_lock_state(state, request);
6065         if (status != 0)
6066                 goto out;
6067         request->fl_flags |= FL_ACCESS;
6068         status = do_vfs_lock(state->inode, request);
6069         if (status < 0)
6070                 goto out;
6071         down_read(&nfsi->rwsem);
6072         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6073                 /* Yes: cache locks! */
6074                 /* ...but avoid races with delegation recall... */
6075                 request->fl_flags = fl_flags & ~FL_SLEEP;
6076                 status = do_vfs_lock(state->inode, request);
6077                 up_read(&nfsi->rwsem);
6078                 goto out;
6079         }
6080         up_read(&nfsi->rwsem);
6081         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6082 out:
6083         request->fl_flags = fl_flags;
6084         return status;
6085 }
6086
6087 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6088 {
6089         struct nfs4_exception exception = {
6090                 .state = state,
6091                 .inode = state->inode,
6092         };
6093         int err;
6094
6095         do {
6096                 err = _nfs4_proc_setlk(state, cmd, request);
6097                 if (err == -NFS4ERR_DENIED)
6098                         err = -EAGAIN;
6099                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6100                                 err, &exception);
6101         } while (exception.retry);
6102         return err;
6103 }
6104
6105 static int
6106 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6107 {
6108         struct nfs_open_context *ctx;
6109         struct nfs4_state *state;
6110         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6111         int status;
6112
6113         /* verify open state */
6114         ctx = nfs_file_open_context(filp);
6115         state = ctx->state;
6116
6117         if (request->fl_start < 0 || request->fl_end < 0)
6118                 return -EINVAL;
6119
6120         if (IS_GETLK(cmd)) {
6121                 if (state != NULL)
6122                         return nfs4_proc_getlk(state, F_GETLK, request);
6123                 return 0;
6124         }
6125
6126         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6127                 return -EINVAL;
6128
6129         if (request->fl_type == F_UNLCK) {
6130                 if (state != NULL)
6131                         return nfs4_proc_unlck(state, cmd, request);
6132                 return 0;
6133         }
6134
6135         if (state == NULL)
6136                 return -ENOLCK;
6137         /*
6138          * Don't rely on the VFS having checked the file open mode,
6139          * since it won't do this for flock() locks.
6140          */
6141         switch (request->fl_type) {
6142         case F_RDLCK:
6143                 if (!(filp->f_mode & FMODE_READ))
6144                         return -EBADF;
6145                 break;
6146         case F_WRLCK:
6147                 if (!(filp->f_mode & FMODE_WRITE))
6148                         return -EBADF;
6149         }
6150
6151         do {
6152                 status = nfs4_proc_setlk(state, cmd, request);
6153                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6154                         break;
6155                 timeout = nfs4_set_lock_task_retry(timeout);
6156                 status = -ERESTARTSYS;
6157                 if (signalled())
6158                         break;
6159         } while(status < 0);
6160         return status;
6161 }
6162
6163 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6164 {
6165         struct nfs_server *server = NFS_SERVER(state->inode);
6166         int err;
6167
6168         err = nfs4_set_lock_state(state, fl);
6169         if (err != 0)
6170                 return err;
6171         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6172         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6173 }
6174
6175 struct nfs_release_lockowner_data {
6176         struct nfs4_lock_state *lsp;
6177         struct nfs_server *server;
6178         struct nfs_release_lockowner_args args;
6179         struct nfs_release_lockowner_res res;
6180         unsigned long timestamp;
6181 };
6182
6183 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6184 {
6185         struct nfs_release_lockowner_data *data = calldata;
6186         struct nfs_server *server = data->server;
6187         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6188                              &data->args.seq_args, &data->res.seq_res, task);
6189         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6190         data->timestamp = jiffies;
6191 }
6192
6193 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6194 {
6195         struct nfs_release_lockowner_data *data = calldata;
6196         struct nfs_server *server = data->server;
6197
6198         nfs40_sequence_done(task, &data->res.seq_res);
6199
6200         switch (task->tk_status) {
6201         case 0:
6202                 renew_lease(server, data->timestamp);
6203                 break;
6204         case -NFS4ERR_STALE_CLIENTID:
6205         case -NFS4ERR_EXPIRED:
6206                 nfs4_schedule_lease_recovery(server->nfs_client);
6207                 break;
6208         case -NFS4ERR_LEASE_MOVED:
6209         case -NFS4ERR_DELAY:
6210                 if (nfs4_async_handle_error(task, server,
6211                                             NULL, NULL) == -EAGAIN)
6212                         rpc_restart_call_prepare(task);
6213         }
6214 }
6215
6216 static void nfs4_release_lockowner_release(void *calldata)
6217 {
6218         struct nfs_release_lockowner_data *data = calldata;
6219         nfs4_free_lock_state(data->server, data->lsp);
6220         kfree(calldata);
6221 }
6222
6223 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6224         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6225         .rpc_call_done = nfs4_release_lockowner_done,
6226         .rpc_release = nfs4_release_lockowner_release,
6227 };
6228
6229 static void
6230 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6231 {
6232         struct nfs_release_lockowner_data *data;
6233         struct rpc_message msg = {
6234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6235         };
6236
6237         if (server->nfs_client->cl_mvops->minor_version != 0)
6238                 return;
6239
6240         data = kmalloc(sizeof(*data), GFP_NOFS);
6241         if (!data)
6242                 return;
6243         data->lsp = lsp;
6244         data->server = server;
6245         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6246         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6247         data->args.lock_owner.s_dev = server->s_dev;
6248
6249         msg.rpc_argp = &data->args;
6250         msg.rpc_resp = &data->res;
6251         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6252         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6253 }
6254
6255 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6256
6257 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6258                                    struct dentry *dentry, const char *key,
6259                                    const void *buf, size_t buflen,
6260                                    int flags)
6261 {
6262         return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
6263 }
6264
6265 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6266                                    struct dentry *unused, struct inode *inode,
6267                                    const char *key, void *buf, size_t buflen)
6268 {
6269         return nfs4_proc_get_acl(inode, buf, buflen);
6270 }
6271
6272 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6273 {
6274         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6275 }
6276
6277 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6278
6279 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6280                                      struct dentry *dentry, const char *key,
6281                                      const void *buf, size_t buflen,
6282                                      int flags)
6283 {
6284         if (security_ismaclabel(key))
6285                 return nfs4_set_security_label(dentry, buf, buflen);
6286
6287         return -EOPNOTSUPP;
6288 }
6289
6290 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6291                                      struct dentry *unused, struct inode *inode,
6292                                      const char *key, void *buf, size_t buflen)
6293 {
6294         if (security_ismaclabel(key))
6295                 return nfs4_get_security_label(inode, buf, buflen);
6296         return -EOPNOTSUPP;
6297 }
6298
6299 static ssize_t
6300 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6301 {
6302         int len = 0;
6303
6304         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6305                 len = security_inode_listsecurity(inode, list, list_len);
6306                 if (list_len && len > list_len)
6307                         return -ERANGE;
6308         }
6309         return len;
6310 }
6311
6312 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6313         .prefix = XATTR_SECURITY_PREFIX,
6314         .get    = nfs4_xattr_get_nfs4_label,
6315         .set    = nfs4_xattr_set_nfs4_label,
6316 };
6317
6318 #else
6319
6320 static ssize_t
6321 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6322 {
6323         return 0;
6324 }
6325
6326 #endif
6327
6328 /*
6329  * nfs_fhget will use either the mounted_on_fileid or the fileid
6330  */
6331 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6332 {
6333         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6334                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6335               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6336               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6337                 return;
6338
6339         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6340                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6341         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6342         fattr->nlink = 2;
6343 }
6344
6345 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6346                                    const struct qstr *name,
6347                                    struct nfs4_fs_locations *fs_locations,
6348                                    struct page *page)
6349 {
6350         struct nfs_server *server = NFS_SERVER(dir);
6351         u32 bitmask[3] = {
6352                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6353         };
6354         struct nfs4_fs_locations_arg args = {
6355                 .dir_fh = NFS_FH(dir),
6356                 .name = name,
6357                 .page = page,
6358                 .bitmask = bitmask,
6359         };
6360         struct nfs4_fs_locations_res res = {
6361                 .fs_locations = fs_locations,
6362         };
6363         struct rpc_message msg = {
6364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6365                 .rpc_argp = &args,
6366                 .rpc_resp = &res,
6367         };
6368         int status;
6369
6370         dprintk("%s: start\n", __func__);
6371
6372         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6373          * is not supported */
6374         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6375                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6376         else
6377                 bitmask[0] |= FATTR4_WORD0_FILEID;
6378
6379         nfs_fattr_init(&fs_locations->fattr);
6380         fs_locations->server = server;
6381         fs_locations->nlocations = 0;
6382         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6383         dprintk("%s: returned status = %d\n", __func__, status);
6384         return status;
6385 }
6386
6387 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6388                            const struct qstr *name,
6389                            struct nfs4_fs_locations *fs_locations,
6390                            struct page *page)
6391 {
6392         struct nfs4_exception exception = { };
6393         int err;
6394         do {
6395                 err = _nfs4_proc_fs_locations(client, dir, name,
6396                                 fs_locations, page);
6397                 trace_nfs4_get_fs_locations(dir, name, err);
6398                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6399                                 &exception);
6400         } while (exception.retry);
6401         return err;
6402 }
6403
6404 /*
6405  * This operation also signals the server that this client is
6406  * performing migration recovery.  The server can stop returning
6407  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6408  * appended to this compound to identify the client ID which is
6409  * performing recovery.
6410  */
6411 static int _nfs40_proc_get_locations(struct inode *inode,
6412                                      struct nfs4_fs_locations *locations,
6413                                      struct page *page, struct rpc_cred *cred)
6414 {
6415         struct nfs_server *server = NFS_SERVER(inode);
6416         struct rpc_clnt *clnt = server->client;
6417         u32 bitmask[2] = {
6418                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6419         };
6420         struct nfs4_fs_locations_arg args = {
6421                 .clientid       = server->nfs_client->cl_clientid,
6422                 .fh             = NFS_FH(inode),
6423                 .page           = page,
6424                 .bitmask        = bitmask,
6425                 .migration      = 1,            /* skip LOOKUP */
6426                 .renew          = 1,            /* append RENEW */
6427         };
6428         struct nfs4_fs_locations_res res = {
6429                 .fs_locations   = locations,
6430                 .migration      = 1,
6431                 .renew          = 1,
6432         };
6433         struct rpc_message msg = {
6434                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6435                 .rpc_argp       = &args,
6436                 .rpc_resp       = &res,
6437                 .rpc_cred       = cred,
6438         };
6439         unsigned long now = jiffies;
6440         int status;
6441
6442         nfs_fattr_init(&locations->fattr);
6443         locations->server = server;
6444         locations->nlocations = 0;
6445
6446         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6447         nfs4_set_sequence_privileged(&args.seq_args);
6448         status = nfs4_call_sync_sequence(clnt, server, &msg,
6449                                         &args.seq_args, &res.seq_res);
6450         if (status)
6451                 return status;
6452
6453         renew_lease(server, now);
6454         return 0;
6455 }
6456
6457 #ifdef CONFIG_NFS_V4_1
6458
6459 /*
6460  * This operation also signals the server that this client is
6461  * performing migration recovery.  The server can stop asserting
6462  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6463  * performing this operation is identified in the SEQUENCE
6464  * operation in this compound.
6465  *
6466  * When the client supports GETATTR(fs_locations_info), it can
6467  * be plumbed in here.
6468  */
6469 static int _nfs41_proc_get_locations(struct inode *inode,
6470                                      struct nfs4_fs_locations *locations,
6471                                      struct page *page, struct rpc_cred *cred)
6472 {
6473         struct nfs_server *server = NFS_SERVER(inode);
6474         struct rpc_clnt *clnt = server->client;
6475         u32 bitmask[2] = {
6476                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6477         };
6478         struct nfs4_fs_locations_arg args = {
6479                 .fh             = NFS_FH(inode),
6480                 .page           = page,
6481                 .bitmask        = bitmask,
6482                 .migration      = 1,            /* skip LOOKUP */
6483         };
6484         struct nfs4_fs_locations_res res = {
6485                 .fs_locations   = locations,
6486                 .migration      = 1,
6487         };
6488         struct rpc_message msg = {
6489                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6490                 .rpc_argp       = &args,
6491                 .rpc_resp       = &res,
6492                 .rpc_cred       = cred,
6493         };
6494         int status;
6495
6496         nfs_fattr_init(&locations->fattr);
6497         locations->server = server;
6498         locations->nlocations = 0;
6499
6500         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6501         nfs4_set_sequence_privileged(&args.seq_args);
6502         status = nfs4_call_sync_sequence(clnt, server, &msg,
6503                                         &args.seq_args, &res.seq_res);
6504         if (status == NFS4_OK &&
6505             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6506                 status = -NFS4ERR_LEASE_MOVED;
6507         return status;
6508 }
6509
6510 #endif  /* CONFIG_NFS_V4_1 */
6511
6512 /**
6513  * nfs4_proc_get_locations - discover locations for a migrated FSID
6514  * @inode: inode on FSID that is migrating
6515  * @locations: result of query
6516  * @page: buffer
6517  * @cred: credential to use for this operation
6518  *
6519  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6520  * operation failed, or a negative errno if a local error occurred.
6521  *
6522  * On success, "locations" is filled in, but if the server has
6523  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6524  * asserted.
6525  *
6526  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6527  * from this client that require migration recovery.
6528  */
6529 int nfs4_proc_get_locations(struct inode *inode,
6530                             struct nfs4_fs_locations *locations,
6531                             struct page *page, struct rpc_cred *cred)
6532 {
6533         struct nfs_server *server = NFS_SERVER(inode);
6534         struct nfs_client *clp = server->nfs_client;
6535         const struct nfs4_mig_recovery_ops *ops =
6536                                         clp->cl_mvops->mig_recovery_ops;
6537         struct nfs4_exception exception = { };
6538         int status;
6539
6540         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6541                 (unsigned long long)server->fsid.major,
6542                 (unsigned long long)server->fsid.minor,
6543                 clp->cl_hostname);
6544         nfs_display_fhandle(NFS_FH(inode), __func__);
6545
6546         do {
6547                 status = ops->get_locations(inode, locations, page, cred);
6548                 if (status != -NFS4ERR_DELAY)
6549                         break;
6550                 nfs4_handle_exception(server, status, &exception);
6551         } while (exception.retry);
6552         return status;
6553 }
6554
6555 /*
6556  * This operation also signals the server that this client is
6557  * performing "lease moved" recovery.  The server can stop
6558  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6559  * is appended to this compound to identify the client ID which is
6560  * performing recovery.
6561  */
6562 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6563 {
6564         struct nfs_server *server = NFS_SERVER(inode);
6565         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6566         struct rpc_clnt *clnt = server->client;
6567         struct nfs4_fsid_present_arg args = {
6568                 .fh             = NFS_FH(inode),
6569                 .clientid       = clp->cl_clientid,
6570                 .renew          = 1,            /* append RENEW */
6571         };
6572         struct nfs4_fsid_present_res res = {
6573                 .renew          = 1,
6574         };
6575         struct rpc_message msg = {
6576                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6577                 .rpc_argp       = &args,
6578                 .rpc_resp       = &res,
6579                 .rpc_cred       = cred,
6580         };
6581         unsigned long now = jiffies;
6582         int status;
6583
6584         res.fh = nfs_alloc_fhandle();
6585         if (res.fh == NULL)
6586                 return -ENOMEM;
6587
6588         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6589         nfs4_set_sequence_privileged(&args.seq_args);
6590         status = nfs4_call_sync_sequence(clnt, server, &msg,
6591                                                 &args.seq_args, &res.seq_res);
6592         nfs_free_fhandle(res.fh);
6593         if (status)
6594                 return status;
6595
6596         do_renew_lease(clp, now);
6597         return 0;
6598 }
6599
6600 #ifdef CONFIG_NFS_V4_1
6601
6602 /*
6603  * This operation also signals the server that this client is
6604  * performing "lease moved" recovery.  The server can stop asserting
6605  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6606  * this operation is identified in the SEQUENCE operation in this
6607  * compound.
6608  */
6609 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6610 {
6611         struct nfs_server *server = NFS_SERVER(inode);
6612         struct rpc_clnt *clnt = server->client;
6613         struct nfs4_fsid_present_arg args = {
6614                 .fh             = NFS_FH(inode),
6615         };
6616         struct nfs4_fsid_present_res res = {
6617         };
6618         struct rpc_message msg = {
6619                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6620                 .rpc_argp       = &args,
6621                 .rpc_resp       = &res,
6622                 .rpc_cred       = cred,
6623         };
6624         int status;
6625
6626         res.fh = nfs_alloc_fhandle();
6627         if (res.fh == NULL)
6628                 return -ENOMEM;
6629
6630         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6631         nfs4_set_sequence_privileged(&args.seq_args);
6632         status = nfs4_call_sync_sequence(clnt, server, &msg,
6633                                                 &args.seq_args, &res.seq_res);
6634         nfs_free_fhandle(res.fh);
6635         if (status == NFS4_OK &&
6636             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6637                 status = -NFS4ERR_LEASE_MOVED;
6638         return status;
6639 }
6640
6641 #endif  /* CONFIG_NFS_V4_1 */
6642
6643 /**
6644  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6645  * @inode: inode on FSID to check
6646  * @cred: credential to use for this operation
6647  *
6648  * Server indicates whether the FSID is present, moved, or not
6649  * recognized.  This operation is necessary to clear a LEASE_MOVED
6650  * condition for this client ID.
6651  *
6652  * Returns NFS4_OK if the FSID is present on this server,
6653  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6654  *  NFS4ERR code if some error occurred on the server, or a
6655  *  negative errno if a local failure occurred.
6656  */
6657 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6658 {
6659         struct nfs_server *server = NFS_SERVER(inode);
6660         struct nfs_client *clp = server->nfs_client;
6661         const struct nfs4_mig_recovery_ops *ops =
6662                                         clp->cl_mvops->mig_recovery_ops;
6663         struct nfs4_exception exception = { };
6664         int status;
6665
6666         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6667                 (unsigned long long)server->fsid.major,
6668                 (unsigned long long)server->fsid.minor,
6669                 clp->cl_hostname);
6670         nfs_display_fhandle(NFS_FH(inode), __func__);
6671
6672         do {
6673                 status = ops->fsid_present(inode, cred);
6674                 if (status != -NFS4ERR_DELAY)
6675                         break;
6676                 nfs4_handle_exception(server, status, &exception);
6677         } while (exception.retry);
6678         return status;
6679 }
6680
6681 /**
6682  * If 'use_integrity' is true and the state managment nfs_client
6683  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6684  * and the machine credential as per RFC3530bis and RFC5661 Security
6685  * Considerations sections. Otherwise, just use the user cred with the
6686  * filesystem's rpc_client.
6687  */
6688 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6689 {
6690         int status;
6691         struct nfs4_secinfo_arg args = {
6692                 .dir_fh = NFS_FH(dir),
6693                 .name   = name,
6694         };
6695         struct nfs4_secinfo_res res = {
6696                 .flavors     = flavors,
6697         };
6698         struct rpc_message msg = {
6699                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6700                 .rpc_argp = &args,
6701                 .rpc_resp = &res,
6702         };
6703         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6704         struct rpc_cred *cred = NULL;
6705
6706         if (use_integrity) {
6707                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6708                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6709                 msg.rpc_cred = cred;
6710         }
6711
6712         dprintk("NFS call  secinfo %s\n", name->name);
6713
6714         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6715                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6716
6717         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6718                                 &res.seq_res, 0);
6719         dprintk("NFS reply  secinfo: %d\n", status);
6720
6721         if (cred)
6722                 put_rpccred(cred);
6723
6724         return status;
6725 }
6726
6727 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6728                       struct nfs4_secinfo_flavors *flavors)
6729 {
6730         struct nfs4_exception exception = { };
6731         int err;
6732         do {
6733                 err = -NFS4ERR_WRONGSEC;
6734
6735                 /* try to use integrity protection with machine cred */
6736                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6737                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6738
6739                 /*
6740                  * if unable to use integrity protection, or SECINFO with
6741                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6742                  * disallowed by spec, but exists in deployed servers) use
6743                  * the current filesystem's rpc_client and the user cred.
6744                  */
6745                 if (err == -NFS4ERR_WRONGSEC)
6746                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6747
6748                 trace_nfs4_secinfo(dir, name, err);
6749                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6750                                 &exception);
6751         } while (exception.retry);
6752         return err;
6753 }
6754
6755 #ifdef CONFIG_NFS_V4_1
6756 /*
6757  * Check the exchange flags returned by the server for invalid flags, having
6758  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6759  * DS flags set.
6760  */
6761 static int nfs4_check_cl_exchange_flags(u32 flags)
6762 {
6763         if (flags & ~EXCHGID4_FLAG_MASK_R)
6764                 goto out_inval;
6765         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6766             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6767                 goto out_inval;
6768         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6769                 goto out_inval;
6770         return NFS_OK;
6771 out_inval:
6772         return -NFS4ERR_INVAL;
6773 }
6774
6775 static bool
6776 nfs41_same_server_scope(struct nfs41_server_scope *a,
6777                         struct nfs41_server_scope *b)
6778 {
6779         if (a->server_scope_sz == b->server_scope_sz &&
6780             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6781                 return true;
6782
6783         return false;
6784 }
6785
6786 static void
6787 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
6788 {
6789 }
6790
6791 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
6792         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
6793 };
6794
6795 /*
6796  * nfs4_proc_bind_one_conn_to_session()
6797  *
6798  * The 4.1 client currently uses the same TCP connection for the
6799  * fore and backchannel.
6800  */
6801 static
6802 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
6803                 struct rpc_xprt *xprt,
6804                 struct nfs_client *clp,
6805                 struct rpc_cred *cred)
6806 {
6807         int status;
6808         struct nfs41_bind_conn_to_session_args args = {
6809                 .client = clp,
6810                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6811         };
6812         struct nfs41_bind_conn_to_session_res res;
6813         struct rpc_message msg = {
6814                 .rpc_proc =
6815                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6816                 .rpc_argp = &args,
6817                 .rpc_resp = &res,
6818                 .rpc_cred = cred,
6819         };
6820         struct rpc_task_setup task_setup_data = {
6821                 .rpc_client = clnt,
6822                 .rpc_xprt = xprt,
6823                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
6824                 .rpc_message = &msg,
6825                 .flags = RPC_TASK_TIMEOUT,
6826         };
6827         struct rpc_task *task;
6828
6829         dprintk("--> %s\n", __func__);
6830
6831         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6832         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6833                 args.dir = NFS4_CDFC4_FORE;
6834
6835         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
6836         if (xprt != rcu_access_pointer(clnt->cl_xprt))
6837                 args.dir = NFS4_CDFC4_FORE;
6838
6839         task = rpc_run_task(&task_setup_data);
6840         if (!IS_ERR(task)) {
6841                 status = task->tk_status;
6842                 rpc_put_task(task);
6843         } else
6844                 status = PTR_ERR(task);
6845         trace_nfs4_bind_conn_to_session(clp, status);
6846         if (status == 0) {
6847                 if (memcmp(res.sessionid.data,
6848                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6849                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6850                         status = -EIO;
6851                         goto out;
6852                 }
6853                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6854                         dprintk("NFS: %s: Unexpected direction from server\n",
6855                                 __func__);
6856                         status = -EIO;
6857                         goto out;
6858                 }
6859                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6860                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6861                                 __func__);
6862                         status = -EIO;
6863                         goto out;
6864                 }
6865         }
6866 out:
6867         dprintk("<-- %s status= %d\n", __func__, status);
6868         return status;
6869 }
6870
6871 struct rpc_bind_conn_calldata {
6872         struct nfs_client *clp;
6873         struct rpc_cred *cred;
6874 };
6875
6876 static int
6877 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
6878                 struct rpc_xprt *xprt,
6879                 void *calldata)
6880 {
6881         struct rpc_bind_conn_calldata *p = calldata;
6882
6883         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
6884 }
6885
6886 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6887 {
6888         struct rpc_bind_conn_calldata data = {
6889                 .clp = clp,
6890                 .cred = cred,
6891         };
6892         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
6893                         nfs4_proc_bind_conn_to_session_callback, &data);
6894 }
6895
6896 /*
6897  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6898  * and operations we'd like to see to enable certain features in the allow map
6899  */
6900 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6901         .how = SP4_MACH_CRED,
6902         .enforce.u.words = {
6903                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6904                       1 << (OP_EXCHANGE_ID - 32) |
6905                       1 << (OP_CREATE_SESSION - 32) |
6906                       1 << (OP_DESTROY_SESSION - 32) |
6907                       1 << (OP_DESTROY_CLIENTID - 32)
6908         },
6909         .allow.u.words = {
6910                 [0] = 1 << (OP_CLOSE) |
6911                       1 << (OP_OPEN_DOWNGRADE) |
6912                       1 << (OP_LOCKU) |
6913                       1 << (OP_DELEGRETURN) |
6914                       1 << (OP_COMMIT),
6915                 [1] = 1 << (OP_SECINFO - 32) |
6916                       1 << (OP_SECINFO_NO_NAME - 32) |
6917                       1 << (OP_LAYOUTRETURN - 32) |
6918                       1 << (OP_TEST_STATEID - 32) |
6919                       1 << (OP_FREE_STATEID - 32) |
6920                       1 << (OP_WRITE - 32)
6921         }
6922 };
6923
6924 /*
6925  * Select the state protection mode for client `clp' given the server results
6926  * from exchange_id in `sp'.
6927  *
6928  * Returns 0 on success, negative errno otherwise.
6929  */
6930 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6931                                  struct nfs41_state_protection *sp)
6932 {
6933         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6934                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6935                       1 << (OP_EXCHANGE_ID - 32) |
6936                       1 << (OP_CREATE_SESSION - 32) |
6937                       1 << (OP_DESTROY_SESSION - 32) |
6938                       1 << (OP_DESTROY_CLIENTID - 32)
6939         };
6940         unsigned int i;
6941
6942         if (sp->how == SP4_MACH_CRED) {
6943                 /* Print state protect result */
6944                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6945                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6946                         if (test_bit(i, sp->enforce.u.longs))
6947                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6948                         if (test_bit(i, sp->allow.u.longs))
6949                                 dfprintk(MOUNT, "  allow op %d\n", i);
6950                 }
6951
6952                 /* make sure nothing is on enforce list that isn't supported */
6953                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6954                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6955                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6956                                 return -EINVAL;
6957                         }
6958                 }
6959
6960                 /*
6961                  * Minimal mode - state operations are allowed to use machine
6962                  * credential.  Note this already happens by default, so the
6963                  * client doesn't have to do anything more than the negotiation.
6964                  *
6965                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6966                  *       we're already using the machine cred for exchange_id
6967                  *       and will never use a different cred.
6968                  */
6969                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6970                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6971                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6972                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6973                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6974                         dfprintk(MOUNT, "  minimal mode enabled\n");
6975                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6976                 } else {
6977                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6978                         return -EINVAL;
6979                 }
6980
6981                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6982                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
6983                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
6984                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6985                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6986                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6987                 }
6988
6989                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
6990                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
6991                         set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
6992                                 &clp->cl_sp4_flags);
6993                 }
6994
6995                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6996                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6997                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6998                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6999                 }
7000
7001                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7002                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7003                         dfprintk(MOUNT, "  stateid mode enabled\n");
7004                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
7005                 }
7006
7007                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7008                         dfprintk(MOUNT, "  write mode enabled\n");
7009                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
7010                 }
7011
7012                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7013                         dfprintk(MOUNT, "  commit mode enabled\n");
7014                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
7015                 }
7016         }
7017
7018         return 0;
7019 }
7020
7021 /*
7022  * _nfs4_proc_exchange_id()
7023  *
7024  * Wrapper for EXCHANGE_ID operation.
7025  */
7026 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7027         u32 sp4_how)
7028 {
7029         nfs4_verifier verifier;
7030         struct nfs41_exchange_id_args args = {
7031                 .verifier = &verifier,
7032                 .client = clp,
7033 #ifdef CONFIG_NFS_V4_1_MIGRATION
7034                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7035                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
7036                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
7037 #else
7038                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7039                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
7040 #endif
7041         };
7042         struct nfs41_exchange_id_res res = {
7043                 0
7044         };
7045         int status;
7046         struct rpc_message msg = {
7047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7048                 .rpc_argp = &args,
7049                 .rpc_resp = &res,
7050                 .rpc_cred = cred,
7051         };
7052
7053         nfs4_init_boot_verifier(clp, &verifier);
7054
7055         status = nfs4_init_uniform_client_string(clp);
7056         if (status)
7057                 goto out;
7058
7059         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
7060                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
7061                 clp->cl_owner_id);
7062
7063         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
7064                                         GFP_NOFS);
7065         if (unlikely(res.server_owner == NULL)) {
7066                 status = -ENOMEM;
7067                 goto out;
7068         }
7069
7070         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7071                                         GFP_NOFS);
7072         if (unlikely(res.server_scope == NULL)) {
7073                 status = -ENOMEM;
7074                 goto out_server_owner;
7075         }
7076
7077         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7078         if (unlikely(res.impl_id == NULL)) {
7079                 status = -ENOMEM;
7080                 goto out_server_scope;
7081         }
7082
7083         switch (sp4_how) {
7084         case SP4_NONE:
7085                 args.state_protect.how = SP4_NONE;
7086                 break;
7087
7088         case SP4_MACH_CRED:
7089                 args.state_protect = nfs4_sp4_mach_cred_request;
7090                 break;
7091
7092         default:
7093                 /* unsupported! */
7094                 WARN_ON_ONCE(1);
7095                 status = -EINVAL;
7096                 goto out_impl_id;
7097         }
7098
7099         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7100         trace_nfs4_exchange_id(clp, status);
7101         if (status == 0)
7102                 status = nfs4_check_cl_exchange_flags(res.flags);
7103
7104         if (status == 0)
7105                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
7106
7107         if (status == 0) {
7108                 clp->cl_clientid = res.clientid;
7109                 clp->cl_exchange_flags = res.flags;
7110                 /* Client ID is not confirmed */
7111                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7112                         clear_bit(NFS4_SESSION_ESTABLISHED,
7113                                         &clp->cl_session->session_state);
7114                         clp->cl_seqid = res.seqid;
7115                 }
7116
7117                 kfree(clp->cl_serverowner);
7118                 clp->cl_serverowner = res.server_owner;
7119                 res.server_owner = NULL;
7120
7121                 /* use the most recent implementation id */
7122                 kfree(clp->cl_implid);
7123                 clp->cl_implid = res.impl_id;
7124                 res.impl_id = NULL;
7125
7126                 if (clp->cl_serverscope != NULL &&
7127                     !nfs41_same_server_scope(clp->cl_serverscope,
7128                                              res.server_scope)) {
7129                         dprintk("%s: server_scope mismatch detected\n",
7130                                 __func__);
7131                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7132                         kfree(clp->cl_serverscope);
7133                         clp->cl_serverscope = NULL;
7134                 }
7135
7136                 if (clp->cl_serverscope == NULL) {
7137                         clp->cl_serverscope = res.server_scope;
7138                         res.server_scope = NULL;
7139                 }
7140         }
7141
7142 out_impl_id:
7143         kfree(res.impl_id);
7144 out_server_scope:
7145         kfree(res.server_scope);
7146 out_server_owner:
7147         kfree(res.server_owner);
7148 out:
7149         if (clp->cl_implid != NULL)
7150                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7151                         "domain: %s, name: %s, date: %llu,%u\n",
7152                         clp->cl_implid->domain, clp->cl_implid->name,
7153                         clp->cl_implid->date.seconds,
7154                         clp->cl_implid->date.nseconds);
7155         dprintk("NFS reply exchange_id: %d\n", status);
7156         return status;
7157 }
7158
7159 /*
7160  * nfs4_proc_exchange_id()
7161  *
7162  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7163  *
7164  * Since the clientid has expired, all compounds using sessions
7165  * associated with the stale clientid will be returning
7166  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7167  * be in some phase of session reset.
7168  *
7169  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7170  */
7171 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7172 {
7173         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7174         int status;
7175
7176         /* try SP4_MACH_CRED if krb5i/p */
7177         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7178             authflavor == RPC_AUTH_GSS_KRB5P) {
7179                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
7180                 if (!status)
7181                         return 0;
7182         }
7183
7184         /* try SP4_NONE */
7185         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
7186 }
7187
7188 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7189                 struct rpc_cred *cred)
7190 {
7191         struct rpc_message msg = {
7192                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7193                 .rpc_argp = clp,
7194                 .rpc_cred = cred,
7195         };
7196         int status;
7197
7198         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7199         trace_nfs4_destroy_clientid(clp, status);
7200         if (status)
7201                 dprintk("NFS: Got error %d from the server %s on "
7202                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7203         return status;
7204 }
7205
7206 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7207                 struct rpc_cred *cred)
7208 {
7209         unsigned int loop;
7210         int ret;
7211
7212         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7213                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7214                 switch (ret) {
7215                 case -NFS4ERR_DELAY:
7216                 case -NFS4ERR_CLIENTID_BUSY:
7217                         ssleep(1);
7218                         break;
7219                 default:
7220                         return ret;
7221                 }
7222         }
7223         return 0;
7224 }
7225
7226 int nfs4_destroy_clientid(struct nfs_client *clp)
7227 {
7228         struct rpc_cred *cred;
7229         int ret = 0;
7230
7231         if (clp->cl_mvops->minor_version < 1)
7232                 goto out;
7233         if (clp->cl_exchange_flags == 0)
7234                 goto out;
7235         if (clp->cl_preserve_clid)
7236                 goto out;
7237         cred = nfs4_get_clid_cred(clp);
7238         ret = nfs4_proc_destroy_clientid(clp, cred);
7239         if (cred)
7240                 put_rpccred(cred);
7241         switch (ret) {
7242         case 0:
7243         case -NFS4ERR_STALE_CLIENTID:
7244                 clp->cl_exchange_flags = 0;
7245         }
7246 out:
7247         return ret;
7248 }
7249
7250 struct nfs4_get_lease_time_data {
7251         struct nfs4_get_lease_time_args *args;
7252         struct nfs4_get_lease_time_res *res;
7253         struct nfs_client *clp;
7254 };
7255
7256 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7257                                         void *calldata)
7258 {
7259         struct nfs4_get_lease_time_data *data =
7260                         (struct nfs4_get_lease_time_data *)calldata;
7261
7262         dprintk("--> %s\n", __func__);
7263         /* just setup sequence, do not trigger session recovery
7264            since we're invoked within one */
7265         nfs41_setup_sequence(data->clp->cl_session,
7266                         &data->args->la_seq_args,
7267                         &data->res->lr_seq_res,
7268                         task);
7269         dprintk("<-- %s\n", __func__);
7270 }
7271
7272 /*
7273  * Called from nfs4_state_manager thread for session setup, so don't recover
7274  * from sequence operation or clientid errors.
7275  */
7276 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7277 {
7278         struct nfs4_get_lease_time_data *data =
7279                         (struct nfs4_get_lease_time_data *)calldata;
7280
7281         dprintk("--> %s\n", __func__);
7282         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7283                 return;
7284         switch (task->tk_status) {
7285         case -NFS4ERR_DELAY:
7286         case -NFS4ERR_GRACE:
7287                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7288                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7289                 task->tk_status = 0;
7290                 /* fall through */
7291         case -NFS4ERR_RETRY_UNCACHED_REP:
7292                 rpc_restart_call_prepare(task);
7293                 return;
7294         }
7295         dprintk("<-- %s\n", __func__);
7296 }
7297
7298 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7299         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7300         .rpc_call_done = nfs4_get_lease_time_done,
7301 };
7302
7303 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7304 {
7305         struct rpc_task *task;
7306         struct nfs4_get_lease_time_args args;
7307         struct nfs4_get_lease_time_res res = {
7308                 .lr_fsinfo = fsinfo,
7309         };
7310         struct nfs4_get_lease_time_data data = {
7311                 .args = &args,
7312                 .res = &res,
7313                 .clp = clp,
7314         };
7315         struct rpc_message msg = {
7316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7317                 .rpc_argp = &args,
7318                 .rpc_resp = &res,
7319         };
7320         struct rpc_task_setup task_setup = {
7321                 .rpc_client = clp->cl_rpcclient,
7322                 .rpc_message = &msg,
7323                 .callback_ops = &nfs4_get_lease_time_ops,
7324                 .callback_data = &data,
7325                 .flags = RPC_TASK_TIMEOUT,
7326         };
7327         int status;
7328
7329         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7330         nfs4_set_sequence_privileged(&args.la_seq_args);
7331         dprintk("--> %s\n", __func__);
7332         task = rpc_run_task(&task_setup);
7333
7334         if (IS_ERR(task))
7335                 status = PTR_ERR(task);
7336         else {
7337                 status = task->tk_status;
7338                 rpc_put_task(task);
7339         }
7340         dprintk("<-- %s return %d\n", __func__, status);
7341
7342         return status;
7343 }
7344
7345 /*
7346  * Initialize the values to be used by the client in CREATE_SESSION
7347  * If nfs4_init_session set the fore channel request and response sizes,
7348  * use them.
7349  *
7350  * Set the back channel max_resp_sz_cached to zero to force the client to
7351  * always set csa_cachethis to FALSE because the current implementation
7352  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7353  */
7354 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7355 {
7356         unsigned int max_rqst_sz, max_resp_sz;
7357
7358         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7359         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7360
7361         /* Fore channel attributes */
7362         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7363         args->fc_attrs.max_resp_sz = max_resp_sz;
7364         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7365         args->fc_attrs.max_reqs = max_session_slots;
7366
7367         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7368                 "max_ops=%u max_reqs=%u\n",
7369                 __func__,
7370                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7371                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7372
7373         /* Back channel attributes */
7374         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7375         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7376         args->bc_attrs.max_resp_sz_cached = 0;
7377         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7378         args->bc_attrs.max_reqs = NFS41_BC_MAX_CALLBACKS;
7379
7380         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7381                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7382                 __func__,
7383                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7384                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7385                 args->bc_attrs.max_reqs);
7386 }
7387
7388 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7389                 struct nfs41_create_session_res *res)
7390 {
7391         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7392         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7393
7394         if (rcvd->max_resp_sz > sent->max_resp_sz)
7395                 return -EINVAL;
7396         /*
7397          * Our requested max_ops is the minimum we need; we're not
7398          * prepared to break up compounds into smaller pieces than that.
7399          * So, no point even trying to continue if the server won't
7400          * cooperate:
7401          */
7402         if (rcvd->max_ops < sent->max_ops)
7403                 return -EINVAL;
7404         if (rcvd->max_reqs == 0)
7405                 return -EINVAL;
7406         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7407                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7408         return 0;
7409 }
7410
7411 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7412                 struct nfs41_create_session_res *res)
7413 {
7414         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7415         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7416
7417         if (!(res->flags & SESSION4_BACK_CHAN))
7418                 goto out;
7419         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7420                 return -EINVAL;
7421         if (rcvd->max_resp_sz < sent->max_resp_sz)
7422                 return -EINVAL;
7423         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7424                 return -EINVAL;
7425         /* These would render the backchannel useless: */
7426         if (rcvd->max_ops != sent->max_ops)
7427                 return -EINVAL;
7428         if (rcvd->max_reqs != sent->max_reqs)
7429                 return -EINVAL;
7430 out:
7431         return 0;
7432 }
7433
7434 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7435                                      struct nfs41_create_session_res *res)
7436 {
7437         int ret;
7438
7439         ret = nfs4_verify_fore_channel_attrs(args, res);
7440         if (ret)
7441                 return ret;
7442         return nfs4_verify_back_channel_attrs(args, res);
7443 }
7444
7445 static void nfs4_update_session(struct nfs4_session *session,
7446                 struct nfs41_create_session_res *res)
7447 {
7448         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7449         /* Mark client id and session as being confirmed */
7450         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7451         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7452         session->flags = res->flags;
7453         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7454         if (res->flags & SESSION4_BACK_CHAN)
7455                 memcpy(&session->bc_attrs, &res->bc_attrs,
7456                                 sizeof(session->bc_attrs));
7457 }
7458
7459 static int _nfs4_proc_create_session(struct nfs_client *clp,
7460                 struct rpc_cred *cred)
7461 {
7462         struct nfs4_session *session = clp->cl_session;
7463         struct nfs41_create_session_args args = {
7464                 .client = clp,
7465                 .clientid = clp->cl_clientid,
7466                 .seqid = clp->cl_seqid,
7467                 .cb_program = NFS4_CALLBACK,
7468         };
7469         struct nfs41_create_session_res res;
7470
7471         struct rpc_message msg = {
7472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7473                 .rpc_argp = &args,
7474                 .rpc_resp = &res,
7475                 .rpc_cred = cred,
7476         };
7477         int status;
7478
7479         nfs4_init_channel_attrs(&args);
7480         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7481
7482         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7483         trace_nfs4_create_session(clp, status);
7484
7485         if (!status) {
7486                 /* Verify the session's negotiated channel_attrs values */
7487                 status = nfs4_verify_channel_attrs(&args, &res);
7488                 /* Increment the clientid slot sequence id */
7489                 if (clp->cl_seqid == res.seqid)
7490                         clp->cl_seqid++;
7491                 if (status)
7492                         goto out;
7493                 nfs4_update_session(session, &res);
7494         }
7495 out:
7496         return status;
7497 }
7498
7499 /*
7500  * Issues a CREATE_SESSION operation to the server.
7501  * It is the responsibility of the caller to verify the session is
7502  * expired before calling this routine.
7503  */
7504 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7505 {
7506         int status;
7507         unsigned *ptr;
7508         struct nfs4_session *session = clp->cl_session;
7509
7510         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7511
7512         status = _nfs4_proc_create_session(clp, cred);
7513         if (status)
7514                 goto out;
7515
7516         /* Init or reset the session slot tables */
7517         status = nfs4_setup_session_slot_tables(session);
7518         dprintk("slot table setup returned %d\n", status);
7519         if (status)
7520                 goto out;
7521
7522         ptr = (unsigned *)&session->sess_id.data[0];
7523         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7524                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7525 out:
7526         dprintk("<-- %s\n", __func__);
7527         return status;
7528 }
7529
7530 /*
7531  * Issue the over-the-wire RPC DESTROY_SESSION.
7532  * The caller must serialize access to this routine.
7533  */
7534 int nfs4_proc_destroy_session(struct nfs4_session *session,
7535                 struct rpc_cred *cred)
7536 {
7537         struct rpc_message msg = {
7538                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7539                 .rpc_argp = session,
7540                 .rpc_cred = cred,
7541         };
7542         int status = 0;
7543
7544         dprintk("--> nfs4_proc_destroy_session\n");
7545
7546         /* session is still being setup */
7547         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7548                 return 0;
7549
7550         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7551         trace_nfs4_destroy_session(session->clp, status);
7552
7553         if (status)
7554                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7555                         "Session has been destroyed regardless...\n", status);
7556
7557         dprintk("<-- nfs4_proc_destroy_session\n");
7558         return status;
7559 }
7560
7561 /*
7562  * Renew the cl_session lease.
7563  */
7564 struct nfs4_sequence_data {
7565         struct nfs_client *clp;
7566         struct nfs4_sequence_args args;
7567         struct nfs4_sequence_res res;
7568 };
7569
7570 static void nfs41_sequence_release(void *data)
7571 {
7572         struct nfs4_sequence_data *calldata = data;
7573         struct nfs_client *clp = calldata->clp;
7574
7575         if (atomic_read(&clp->cl_count) > 1)
7576                 nfs4_schedule_state_renewal(clp);
7577         nfs_put_client(clp);
7578         kfree(calldata);
7579 }
7580
7581 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7582 {
7583         switch(task->tk_status) {
7584         case -NFS4ERR_DELAY:
7585                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7586                 return -EAGAIN;
7587         default:
7588                 nfs4_schedule_lease_recovery(clp);
7589         }
7590         return 0;
7591 }
7592
7593 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7594 {
7595         struct nfs4_sequence_data *calldata = data;
7596         struct nfs_client *clp = calldata->clp;
7597
7598         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7599                 return;
7600
7601         trace_nfs4_sequence(clp, task->tk_status);
7602         if (task->tk_status < 0) {
7603                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7604                 if (atomic_read(&clp->cl_count) == 1)
7605                         goto out;
7606
7607                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7608                         rpc_restart_call_prepare(task);
7609                         return;
7610                 }
7611         }
7612         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7613 out:
7614         dprintk("<-- %s\n", __func__);
7615 }
7616
7617 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7618 {
7619         struct nfs4_sequence_data *calldata = data;
7620         struct nfs_client *clp = calldata->clp;
7621         struct nfs4_sequence_args *args;
7622         struct nfs4_sequence_res *res;
7623
7624         args = task->tk_msg.rpc_argp;
7625         res = task->tk_msg.rpc_resp;
7626
7627         nfs41_setup_sequence(clp->cl_session, args, res, task);
7628 }
7629
7630 static const struct rpc_call_ops nfs41_sequence_ops = {
7631         .rpc_call_done = nfs41_sequence_call_done,
7632         .rpc_call_prepare = nfs41_sequence_prepare,
7633         .rpc_release = nfs41_sequence_release,
7634 };
7635
7636 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7637                 struct rpc_cred *cred,
7638                 bool is_privileged)
7639 {
7640         struct nfs4_sequence_data *calldata;
7641         struct rpc_message msg = {
7642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7643                 .rpc_cred = cred,
7644         };
7645         struct rpc_task_setup task_setup_data = {
7646                 .rpc_client = clp->cl_rpcclient,
7647                 .rpc_message = &msg,
7648                 .callback_ops = &nfs41_sequence_ops,
7649                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7650         };
7651
7652         if (!atomic_inc_not_zero(&clp->cl_count))
7653                 return ERR_PTR(-EIO);
7654         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7655         if (calldata == NULL) {
7656                 nfs_put_client(clp);
7657                 return ERR_PTR(-ENOMEM);
7658         }
7659         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7660         if (is_privileged)
7661                 nfs4_set_sequence_privileged(&calldata->args);
7662         msg.rpc_argp = &calldata->args;
7663         msg.rpc_resp = &calldata->res;
7664         calldata->clp = clp;
7665         task_setup_data.callback_data = calldata;
7666
7667         return rpc_run_task(&task_setup_data);
7668 }
7669
7670 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7671 {
7672         struct rpc_task *task;
7673         int ret = 0;
7674
7675         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7676                 return -EAGAIN;
7677         task = _nfs41_proc_sequence(clp, cred, false);
7678         if (IS_ERR(task))
7679                 ret = PTR_ERR(task);
7680         else
7681                 rpc_put_task_async(task);
7682         dprintk("<-- %s status=%d\n", __func__, ret);
7683         return ret;
7684 }
7685
7686 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7687 {
7688         struct rpc_task *task;
7689         int ret;
7690
7691         task = _nfs41_proc_sequence(clp, cred, true);
7692         if (IS_ERR(task)) {
7693                 ret = PTR_ERR(task);
7694                 goto out;
7695         }
7696         ret = rpc_wait_for_completion_task(task);
7697         if (!ret)
7698                 ret = task->tk_status;
7699         rpc_put_task(task);
7700 out:
7701         dprintk("<-- %s status=%d\n", __func__, ret);
7702         return ret;
7703 }
7704
7705 struct nfs4_reclaim_complete_data {
7706         struct nfs_client *clp;
7707         struct nfs41_reclaim_complete_args arg;
7708         struct nfs41_reclaim_complete_res res;
7709 };
7710
7711 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7712 {
7713         struct nfs4_reclaim_complete_data *calldata = data;
7714
7715         nfs41_setup_sequence(calldata->clp->cl_session,
7716                         &calldata->arg.seq_args,
7717                         &calldata->res.seq_res,
7718                         task);
7719 }
7720
7721 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7722 {
7723         switch(task->tk_status) {
7724         case 0:
7725         case -NFS4ERR_COMPLETE_ALREADY:
7726         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7727                 break;
7728         case -NFS4ERR_DELAY:
7729                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7730                 /* fall through */
7731         case -NFS4ERR_RETRY_UNCACHED_REP:
7732                 return -EAGAIN;
7733         default:
7734                 nfs4_schedule_lease_recovery(clp);
7735         }
7736         return 0;
7737 }
7738
7739 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7740 {
7741         struct nfs4_reclaim_complete_data *calldata = data;
7742         struct nfs_client *clp = calldata->clp;
7743         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7744
7745         dprintk("--> %s\n", __func__);
7746         if (!nfs41_sequence_done(task, res))
7747                 return;
7748
7749         trace_nfs4_reclaim_complete(clp, task->tk_status);
7750         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7751                 rpc_restart_call_prepare(task);
7752                 return;
7753         }
7754         dprintk("<-- %s\n", __func__);
7755 }
7756
7757 static void nfs4_free_reclaim_complete_data(void *data)
7758 {
7759         struct nfs4_reclaim_complete_data *calldata = data;
7760
7761         kfree(calldata);
7762 }
7763
7764 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7765         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7766         .rpc_call_done = nfs4_reclaim_complete_done,
7767         .rpc_release = nfs4_free_reclaim_complete_data,
7768 };
7769
7770 /*
7771  * Issue a global reclaim complete.
7772  */
7773 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7774                 struct rpc_cred *cred)
7775 {
7776         struct nfs4_reclaim_complete_data *calldata;
7777         struct rpc_task *task;
7778         struct rpc_message msg = {
7779                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7780                 .rpc_cred = cred,
7781         };
7782         struct rpc_task_setup task_setup_data = {
7783                 .rpc_client = clp->cl_rpcclient,
7784                 .rpc_message = &msg,
7785                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7786                 .flags = RPC_TASK_ASYNC,
7787         };
7788         int status = -ENOMEM;
7789
7790         dprintk("--> %s\n", __func__);
7791         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7792         if (calldata == NULL)
7793                 goto out;
7794         calldata->clp = clp;
7795         calldata->arg.one_fs = 0;
7796
7797         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7798         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7799         msg.rpc_argp = &calldata->arg;
7800         msg.rpc_resp = &calldata->res;
7801         task_setup_data.callback_data = calldata;
7802         task = rpc_run_task(&task_setup_data);
7803         if (IS_ERR(task)) {
7804                 status = PTR_ERR(task);
7805                 goto out;
7806         }
7807         status = nfs4_wait_for_completion_rpc_task(task);
7808         if (status == 0)
7809                 status = task->tk_status;
7810         rpc_put_task(task);
7811         return 0;
7812 out:
7813         dprintk("<-- %s status=%d\n", __func__, status);
7814         return status;
7815 }
7816
7817 static void
7818 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7819 {
7820         struct nfs4_layoutget *lgp = calldata;
7821         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7822         struct nfs4_session *session = nfs4_get_session(server);
7823         int ret;
7824
7825         dprintk("--> %s\n", __func__);
7826         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7827          * right now covering the LAYOUTGET we are about to send.
7828          * However, that is not so catastrophic, and there seems
7829          * to be no way to prevent it completely.
7830          */
7831         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7832                                 &lgp->res.seq_res, task))
7833                 return;
7834         ret = pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7835                                           NFS_I(lgp->args.inode)->layout,
7836                                           &lgp->args.range,
7837                                           lgp->args.ctx->state);
7838         if (ret < 0)
7839                 rpc_exit(task, ret);
7840 }
7841
7842 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7843 {
7844         struct nfs4_layoutget *lgp = calldata;
7845         struct inode *inode = lgp->args.inode;
7846         struct nfs_server *server = NFS_SERVER(inode);
7847         struct pnfs_layout_hdr *lo;
7848         struct nfs4_state *state = NULL;
7849         unsigned long timeo, now, giveup;
7850
7851         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7852
7853         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7854                 goto out;
7855
7856         switch (task->tk_status) {
7857         case 0:
7858                 goto out;
7859
7860         /*
7861          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
7862          * on the file. set tk_status to -ENODATA to tell upper layer to
7863          * retry go inband.
7864          */
7865         case -NFS4ERR_LAYOUTUNAVAILABLE:
7866                 task->tk_status = -ENODATA;
7867                 goto out;
7868         /*
7869          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
7870          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
7871          */
7872         case -NFS4ERR_BADLAYOUT:
7873                 goto out_overflow;
7874         /*
7875          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7876          * (or clients) writing to the same RAID stripe except when
7877          * the minlength argument is 0 (see RFC5661 section 18.43.3).
7878          */
7879         case -NFS4ERR_LAYOUTTRYLATER:
7880                 if (lgp->args.minlength == 0)
7881                         goto out_overflow;
7882         /*
7883          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7884          * existing layout before getting a new one).
7885          */
7886         case -NFS4ERR_RECALLCONFLICT:
7887                 timeo = rpc_get_timeout(task->tk_client);
7888                 giveup = lgp->args.timestamp + timeo;
7889                 now = jiffies;
7890                 if (time_after(giveup, now)) {
7891                         unsigned long delay;
7892
7893                         /* Delay for:
7894                          * - Not less then NFS4_POLL_RETRY_MIN.
7895                          * - One last time a jiffie before we give up
7896                          * - exponential backoff (time_now minus start_attempt)
7897                          */
7898                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7899                                     min((giveup - now - 1),
7900                                         now - lgp->args.timestamp));
7901
7902                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7903                                 __func__, delay);
7904                         rpc_delay(task, delay);
7905                         /* Do not call nfs4_async_handle_error() */
7906                         goto out_restart;
7907                 }
7908                 break;
7909         case -NFS4ERR_EXPIRED:
7910         case -NFS4ERR_BAD_STATEID:
7911                 spin_lock(&inode->i_lock);
7912                 if (nfs4_stateid_match(&lgp->args.stateid,
7913                                         &lgp->args.ctx->state->stateid)) {
7914                         spin_unlock(&inode->i_lock);
7915                         /* If the open stateid was bad, then recover it. */
7916                         state = lgp->args.ctx->state;
7917                         break;
7918                 }
7919                 lo = NFS_I(inode)->layout;
7920                 if (lo && nfs4_stateid_match(&lgp->args.stateid,
7921                                         &lo->plh_stateid)) {
7922                         LIST_HEAD(head);
7923
7924                         /*
7925                          * Mark the bad layout state as invalid, then retry
7926                          * with the current stateid.
7927                          */
7928                         set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
7929                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7930                         spin_unlock(&inode->i_lock);
7931                         pnfs_free_lseg_list(&head);
7932                 } else
7933                         spin_unlock(&inode->i_lock);
7934                 goto out_restart;
7935         }
7936         if (nfs4_async_handle_error(task, server, state, &lgp->timeout) == -EAGAIN)
7937                 goto out_restart;
7938 out:
7939         dprintk("<-- %s\n", __func__);
7940         return;
7941 out_restart:
7942         task->tk_status = 0;
7943         rpc_restart_call_prepare(task);
7944         return;
7945 out_overflow:
7946         task->tk_status = -EOVERFLOW;
7947         goto out;
7948 }
7949
7950 static size_t max_response_pages(struct nfs_server *server)
7951 {
7952         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7953         return nfs_page_array_len(0, max_resp_sz);
7954 }
7955
7956 static void nfs4_free_pages(struct page **pages, size_t size)
7957 {
7958         int i;
7959
7960         if (!pages)
7961                 return;
7962
7963         for (i = 0; i < size; i++) {
7964                 if (!pages[i])
7965                         break;
7966                 __free_page(pages[i]);
7967         }
7968         kfree(pages);
7969 }
7970
7971 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7972 {
7973         struct page **pages;
7974         int i;
7975
7976         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7977         if (!pages) {
7978                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7979                 return NULL;
7980         }
7981
7982         for (i = 0; i < size; i++) {
7983                 pages[i] = alloc_page(gfp_flags);
7984                 if (!pages[i]) {
7985                         dprintk("%s: failed to allocate page\n", __func__);
7986                         nfs4_free_pages(pages, size);
7987                         return NULL;
7988                 }
7989         }
7990
7991         return pages;
7992 }
7993
7994 static void nfs4_layoutget_release(void *calldata)
7995 {
7996         struct nfs4_layoutget *lgp = calldata;
7997         struct inode *inode = lgp->args.inode;
7998         struct nfs_server *server = NFS_SERVER(inode);
7999         size_t max_pages = max_response_pages(server);
8000
8001         dprintk("--> %s\n", __func__);
8002         nfs4_free_pages(lgp->args.layout.pages, max_pages);
8003         pnfs_put_layout_hdr(NFS_I(inode)->layout);
8004         put_nfs_open_context(lgp->args.ctx);
8005         kfree(calldata);
8006         dprintk("<-- %s\n", __func__);
8007 }
8008
8009 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
8010         .rpc_call_prepare = nfs4_layoutget_prepare,
8011         .rpc_call_done = nfs4_layoutget_done,
8012         .rpc_release = nfs4_layoutget_release,
8013 };
8014
8015 struct pnfs_layout_segment *
8016 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
8017 {
8018         struct inode *inode = lgp->args.inode;
8019         struct nfs_server *server = NFS_SERVER(inode);
8020         size_t max_pages = max_response_pages(server);
8021         struct rpc_task *task;
8022         struct rpc_message msg = {
8023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
8024                 .rpc_argp = &lgp->args,
8025                 .rpc_resp = &lgp->res,
8026                 .rpc_cred = lgp->cred,
8027         };
8028         struct rpc_task_setup task_setup_data = {
8029                 .rpc_client = server->client,
8030                 .rpc_message = &msg,
8031                 .callback_ops = &nfs4_layoutget_call_ops,
8032                 .callback_data = lgp,
8033                 .flags = RPC_TASK_ASYNC,
8034         };
8035         struct pnfs_layout_segment *lseg = NULL;
8036         int status = 0;
8037
8038         dprintk("--> %s\n", __func__);
8039
8040         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
8041         pnfs_get_layout_hdr(NFS_I(inode)->layout);
8042
8043         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
8044         if (!lgp->args.layout.pages) {
8045                 nfs4_layoutget_release(lgp);
8046                 return ERR_PTR(-ENOMEM);
8047         }
8048         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
8049         lgp->args.timestamp = jiffies;
8050
8051         lgp->res.layoutp = &lgp->args.layout;
8052         lgp->res.seq_res.sr_slot = NULL;
8053         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
8054
8055         task = rpc_run_task(&task_setup_data);
8056         if (IS_ERR(task))
8057                 return ERR_CAST(task);
8058         status = nfs4_wait_for_completion_rpc_task(task);
8059         if (status == 0)
8060                 status = task->tk_status;
8061         trace_nfs4_layoutget(lgp->args.ctx,
8062                         &lgp->args.range,
8063                         &lgp->res.range,
8064                         &lgp->res.stateid,
8065                         status);
8066         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8067         if (status == 0 && lgp->res.layoutp->len)
8068                 lseg = pnfs_layout_process(lgp);
8069         rpc_put_task(task);
8070         dprintk("<-- %s status=%d\n", __func__, status);
8071         if (status)
8072                 return ERR_PTR(status);
8073         return lseg;
8074 }
8075
8076 static void
8077 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8078 {
8079         struct nfs4_layoutreturn *lrp = calldata;
8080
8081         dprintk("--> %s\n", __func__);
8082         nfs41_setup_sequence(lrp->clp->cl_session,
8083                         &lrp->args.seq_args,
8084                         &lrp->res.seq_res,
8085                         task);
8086 }
8087
8088 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8089 {
8090         struct nfs4_layoutreturn *lrp = calldata;
8091         struct nfs_server *server;
8092
8093         dprintk("--> %s\n", __func__);
8094
8095         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
8096                 return;
8097
8098         server = NFS_SERVER(lrp->args.inode);
8099         switch (task->tk_status) {
8100         default:
8101                 task->tk_status = 0;
8102         case 0:
8103                 break;
8104         case -NFS4ERR_DELAY:
8105                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8106                         break;
8107                 rpc_restart_call_prepare(task);
8108                 return;
8109         }
8110         dprintk("<-- %s\n", __func__);
8111 }
8112
8113 static void nfs4_layoutreturn_release(void *calldata)
8114 {
8115         struct nfs4_layoutreturn *lrp = calldata;
8116         struct pnfs_layout_hdr *lo = lrp->args.layout;
8117         LIST_HEAD(freeme);
8118
8119         dprintk("--> %s\n", __func__);
8120         spin_lock(&lo->plh_inode->i_lock);
8121         pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range);
8122         pnfs_mark_layout_returned_if_empty(lo);
8123         if (lrp->res.lrs_present)
8124                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8125         pnfs_clear_layoutreturn_waitbit(lo);
8126         spin_unlock(&lo->plh_inode->i_lock);
8127         pnfs_free_lseg_list(&freeme);
8128         pnfs_put_layout_hdr(lrp->args.layout);
8129         nfs_iput_and_deactive(lrp->inode);
8130         kfree(calldata);
8131         dprintk("<-- %s\n", __func__);
8132 }
8133
8134 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8135         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8136         .rpc_call_done = nfs4_layoutreturn_done,
8137         .rpc_release = nfs4_layoutreturn_release,
8138 };
8139
8140 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8141 {
8142         struct rpc_task *task;
8143         struct rpc_message msg = {
8144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8145                 .rpc_argp = &lrp->args,
8146                 .rpc_resp = &lrp->res,
8147                 .rpc_cred = lrp->cred,
8148         };
8149         struct rpc_task_setup task_setup_data = {
8150                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8151                 .rpc_message = &msg,
8152                 .callback_ops = &nfs4_layoutreturn_call_ops,
8153                 .callback_data = lrp,
8154         };
8155         int status = 0;
8156
8157         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8158                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8159                         &task_setup_data.rpc_client, &msg);
8160
8161         dprintk("--> %s\n", __func__);
8162         if (!sync) {
8163                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8164                 if (!lrp->inode) {
8165                         nfs4_layoutreturn_release(lrp);
8166                         return -EAGAIN;
8167                 }
8168                 task_setup_data.flags |= RPC_TASK_ASYNC;
8169         }
8170         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8171         task = rpc_run_task(&task_setup_data);
8172         if (IS_ERR(task))
8173                 return PTR_ERR(task);
8174         if (sync)
8175                 status = task->tk_status;
8176         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8177         dprintk("<-- %s status=%d\n", __func__, status);
8178         rpc_put_task(task);
8179         return status;
8180 }
8181
8182 static int
8183 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8184                 struct pnfs_device *pdev,
8185                 struct rpc_cred *cred)
8186 {
8187         struct nfs4_getdeviceinfo_args args = {
8188                 .pdev = pdev,
8189                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8190                         NOTIFY_DEVICEID4_DELETE,
8191         };
8192         struct nfs4_getdeviceinfo_res res = {
8193                 .pdev = pdev,
8194         };
8195         struct rpc_message msg = {
8196                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8197                 .rpc_argp = &args,
8198                 .rpc_resp = &res,
8199                 .rpc_cred = cred,
8200         };
8201         int status;
8202
8203         dprintk("--> %s\n", __func__);
8204         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8205         if (res.notification & ~args.notify_types)
8206                 dprintk("%s: unsupported notification\n", __func__);
8207         if (res.notification != args.notify_types)
8208                 pdev->nocache = 1;
8209
8210         dprintk("<-- %s status=%d\n", __func__, status);
8211
8212         return status;
8213 }
8214
8215 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8216                 struct pnfs_device *pdev,
8217                 struct rpc_cred *cred)
8218 {
8219         struct nfs4_exception exception = { };
8220         int err;
8221
8222         do {
8223                 err = nfs4_handle_exception(server,
8224                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8225                                         &exception);
8226         } while (exception.retry);
8227         return err;
8228 }
8229 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8230
8231 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8232 {
8233         struct nfs4_layoutcommit_data *data = calldata;
8234         struct nfs_server *server = NFS_SERVER(data->args.inode);
8235         struct nfs4_session *session = nfs4_get_session(server);
8236
8237         nfs41_setup_sequence(session,
8238                         &data->args.seq_args,
8239                         &data->res.seq_res,
8240                         task);
8241 }
8242
8243 static void
8244 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8245 {
8246         struct nfs4_layoutcommit_data *data = calldata;
8247         struct nfs_server *server = NFS_SERVER(data->args.inode);
8248
8249         if (!nfs41_sequence_done(task, &data->res.seq_res))
8250                 return;
8251
8252         switch (task->tk_status) { /* Just ignore these failures */
8253         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8254         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8255         case -NFS4ERR_BADLAYOUT:     /* no layout */
8256         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8257                 task->tk_status = 0;
8258         case 0:
8259                 break;
8260         default:
8261                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8262                         rpc_restart_call_prepare(task);
8263                         return;
8264                 }
8265         }
8266 }
8267
8268 static void nfs4_layoutcommit_release(void *calldata)
8269 {
8270         struct nfs4_layoutcommit_data *data = calldata;
8271
8272         pnfs_cleanup_layoutcommit(data);
8273         nfs_post_op_update_inode_force_wcc(data->args.inode,
8274                                            data->res.fattr);
8275         put_rpccred(data->cred);
8276         nfs_iput_and_deactive(data->inode);
8277         kfree(data);
8278 }
8279
8280 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8281         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8282         .rpc_call_done = nfs4_layoutcommit_done,
8283         .rpc_release = nfs4_layoutcommit_release,
8284 };
8285
8286 int
8287 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8288 {
8289         struct rpc_message msg = {
8290                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8291                 .rpc_argp = &data->args,
8292                 .rpc_resp = &data->res,
8293                 .rpc_cred = data->cred,
8294         };
8295         struct rpc_task_setup task_setup_data = {
8296                 .task = &data->task,
8297                 .rpc_client = NFS_CLIENT(data->args.inode),
8298                 .rpc_message = &msg,
8299                 .callback_ops = &nfs4_layoutcommit_ops,
8300                 .callback_data = data,
8301         };
8302         struct rpc_task *task;
8303         int status = 0;
8304
8305         dprintk("NFS: initiating layoutcommit call. sync %d "
8306                 "lbw: %llu inode %lu\n", sync,
8307                 data->args.lastbytewritten,
8308                 data->args.inode->i_ino);
8309
8310         if (!sync) {
8311                 data->inode = nfs_igrab_and_active(data->args.inode);
8312                 if (data->inode == NULL) {
8313                         nfs4_layoutcommit_release(data);
8314                         return -EAGAIN;
8315                 }
8316                 task_setup_data.flags = RPC_TASK_ASYNC;
8317         }
8318         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8319         task = rpc_run_task(&task_setup_data);
8320         if (IS_ERR(task))
8321                 return PTR_ERR(task);
8322         if (sync)
8323                 status = task->tk_status;
8324         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
8325         dprintk("%s: status %d\n", __func__, status);
8326         rpc_put_task(task);
8327         return status;
8328 }
8329
8330 /**
8331  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8332  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8333  */
8334 static int
8335 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8336                     struct nfs_fsinfo *info,
8337                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8338 {
8339         struct nfs41_secinfo_no_name_args args = {
8340                 .style = SECINFO_STYLE_CURRENT_FH,
8341         };
8342         struct nfs4_secinfo_res res = {
8343                 .flavors = flavors,
8344         };
8345         struct rpc_message msg = {
8346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8347                 .rpc_argp = &args,
8348                 .rpc_resp = &res,
8349         };
8350         struct rpc_clnt *clnt = server->client;
8351         struct rpc_cred *cred = NULL;
8352         int status;
8353
8354         if (use_integrity) {
8355                 clnt = server->nfs_client->cl_rpcclient;
8356                 cred = nfs4_get_clid_cred(server->nfs_client);
8357                 msg.rpc_cred = cred;
8358         }
8359
8360         dprintk("--> %s\n", __func__);
8361         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8362                                 &res.seq_res, 0);
8363         dprintk("<-- %s status=%d\n", __func__, status);
8364
8365         if (cred)
8366                 put_rpccred(cred);
8367
8368         return status;
8369 }
8370
8371 static int
8372 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8373                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8374 {
8375         struct nfs4_exception exception = { };
8376         int err;
8377         do {
8378                 /* first try using integrity protection */
8379                 err = -NFS4ERR_WRONGSEC;
8380
8381                 /* try to use integrity protection with machine cred */
8382                 if (_nfs4_is_integrity_protected(server->nfs_client))
8383                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8384                                                           flavors, true);
8385
8386                 /*
8387                  * if unable to use integrity protection, or SECINFO with
8388                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8389                  * disallowed by spec, but exists in deployed servers) use
8390                  * the current filesystem's rpc_client and the user cred.
8391                  */
8392                 if (err == -NFS4ERR_WRONGSEC)
8393                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8394                                                           flavors, false);
8395
8396                 switch (err) {
8397                 case 0:
8398                 case -NFS4ERR_WRONGSEC:
8399                 case -ENOTSUPP:
8400                         goto out;
8401                 default:
8402                         err = nfs4_handle_exception(server, err, &exception);
8403                 }
8404         } while (exception.retry);
8405 out:
8406         return err;
8407 }
8408
8409 static int
8410 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8411                     struct nfs_fsinfo *info)
8412 {
8413         int err;
8414         struct page *page;
8415         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8416         struct nfs4_secinfo_flavors *flavors;
8417         struct nfs4_secinfo4 *secinfo;
8418         int i;
8419
8420         page = alloc_page(GFP_KERNEL);
8421         if (!page) {
8422                 err = -ENOMEM;
8423                 goto out;
8424         }
8425
8426         flavors = page_address(page);
8427         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8428
8429         /*
8430          * Fall back on "guess and check" method if
8431          * the server doesn't support SECINFO_NO_NAME
8432          */
8433         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8434                 err = nfs4_find_root_sec(server, fhandle, info);
8435                 goto out_freepage;
8436         }
8437         if (err)
8438                 goto out_freepage;
8439
8440         for (i = 0; i < flavors->num_flavors; i++) {
8441                 secinfo = &flavors->flavors[i];
8442
8443                 switch (secinfo->flavor) {
8444                 case RPC_AUTH_NULL:
8445                 case RPC_AUTH_UNIX:
8446                 case RPC_AUTH_GSS:
8447                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8448                                         &secinfo->flavor_info);
8449                         break;
8450                 default:
8451                         flavor = RPC_AUTH_MAXFLAVOR;
8452                         break;
8453                 }
8454
8455                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8456                         flavor = RPC_AUTH_MAXFLAVOR;
8457
8458                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8459                         err = nfs4_lookup_root_sec(server, fhandle,
8460                                                    info, flavor);
8461                         if (!err)
8462                                 break;
8463                 }
8464         }
8465
8466         if (flavor == RPC_AUTH_MAXFLAVOR)
8467                 err = -EPERM;
8468
8469 out_freepage:
8470         put_page(page);
8471         if (err == -EACCES)
8472                 return -EPERM;
8473 out:
8474         return err;
8475 }
8476
8477 static int _nfs41_test_stateid(struct nfs_server *server,
8478                 nfs4_stateid *stateid,
8479                 struct rpc_cred *cred)
8480 {
8481         int status;
8482         struct nfs41_test_stateid_args args = {
8483                 .stateid = stateid,
8484         };
8485         struct nfs41_test_stateid_res res;
8486         struct rpc_message msg = {
8487                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8488                 .rpc_argp = &args,
8489                 .rpc_resp = &res,
8490                 .rpc_cred = cred,
8491         };
8492         struct rpc_clnt *rpc_client = server->client;
8493
8494         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8495                 &rpc_client, &msg);
8496
8497         dprintk("NFS call  test_stateid %p\n", stateid);
8498         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8499         nfs4_set_sequence_privileged(&args.seq_args);
8500         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8501                         &args.seq_args, &res.seq_res);
8502         if (status != NFS_OK) {
8503                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8504                 return status;
8505         }
8506         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8507         return -res.status;
8508 }
8509
8510 /**
8511  * nfs41_test_stateid - perform a TEST_STATEID operation
8512  *
8513  * @server: server / transport on which to perform the operation
8514  * @stateid: state ID to test
8515  * @cred: credential
8516  *
8517  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8518  * Otherwise a negative NFS4ERR value is returned if the operation
8519  * failed or the state ID is not currently valid.
8520  */
8521 static int nfs41_test_stateid(struct nfs_server *server,
8522                 nfs4_stateid *stateid,
8523                 struct rpc_cred *cred)
8524 {
8525         struct nfs4_exception exception = { };
8526         int err;
8527         do {
8528                 err = _nfs41_test_stateid(server, stateid, cred);
8529                 if (err != -NFS4ERR_DELAY)
8530                         break;
8531                 nfs4_handle_exception(server, err, &exception);
8532         } while (exception.retry);
8533         return err;
8534 }
8535
8536 struct nfs_free_stateid_data {
8537         struct nfs_server *server;
8538         struct nfs41_free_stateid_args args;
8539         struct nfs41_free_stateid_res res;
8540 };
8541
8542 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8543 {
8544         struct nfs_free_stateid_data *data = calldata;
8545         nfs41_setup_sequence(nfs4_get_session(data->server),
8546                         &data->args.seq_args,
8547                         &data->res.seq_res,
8548                         task);
8549 }
8550
8551 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8552 {
8553         struct nfs_free_stateid_data *data = calldata;
8554
8555         nfs41_sequence_done(task, &data->res.seq_res);
8556
8557         switch (task->tk_status) {
8558         case -NFS4ERR_DELAY:
8559                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8560                         rpc_restart_call_prepare(task);
8561         }
8562 }
8563
8564 static void nfs41_free_stateid_release(void *calldata)
8565 {
8566         kfree(calldata);
8567 }
8568
8569 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8570         .rpc_call_prepare = nfs41_free_stateid_prepare,
8571         .rpc_call_done = nfs41_free_stateid_done,
8572         .rpc_release = nfs41_free_stateid_release,
8573 };
8574
8575 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8576                 nfs4_stateid *stateid,
8577                 struct rpc_cred *cred,
8578                 bool privileged)
8579 {
8580         struct rpc_message msg = {
8581                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8582                 .rpc_cred = cred,
8583         };
8584         struct rpc_task_setup task_setup = {
8585                 .rpc_client = server->client,
8586                 .rpc_message = &msg,
8587                 .callback_ops = &nfs41_free_stateid_ops,
8588                 .flags = RPC_TASK_ASYNC,
8589         };
8590         struct nfs_free_stateid_data *data;
8591
8592         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8593                 &task_setup.rpc_client, &msg);
8594
8595         dprintk("NFS call  free_stateid %p\n", stateid);
8596         data = kmalloc(sizeof(*data), GFP_NOFS);
8597         if (!data)
8598                 return ERR_PTR(-ENOMEM);
8599         data->server = server;
8600         nfs4_stateid_copy(&data->args.stateid, stateid);
8601
8602         task_setup.callback_data = data;
8603
8604         msg.rpc_argp = &data->args;
8605         msg.rpc_resp = &data->res;
8606         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8607         if (privileged)
8608                 nfs4_set_sequence_privileged(&data->args.seq_args);
8609
8610         return rpc_run_task(&task_setup);
8611 }
8612
8613 /**
8614  * nfs41_free_stateid - perform a FREE_STATEID operation
8615  *
8616  * @server: server / transport on which to perform the operation
8617  * @stateid: state ID to release
8618  * @cred: credential
8619  *
8620  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8621  * negative NFS4ERR value is returned.
8622  */
8623 static int nfs41_free_stateid(struct nfs_server *server,
8624                 nfs4_stateid *stateid,
8625                 struct rpc_cred *cred)
8626 {
8627         struct rpc_task *task;
8628         int ret;
8629
8630         task = _nfs41_free_stateid(server, stateid, cred, true);
8631         if (IS_ERR(task))
8632                 return PTR_ERR(task);
8633         ret = rpc_wait_for_completion_task(task);
8634         if (!ret)
8635                 ret = task->tk_status;
8636         rpc_put_task(task);
8637         return ret;
8638 }
8639
8640 static void
8641 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8642 {
8643         struct rpc_task *task;
8644         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8645
8646         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8647         nfs4_free_lock_state(server, lsp);
8648         if (IS_ERR(task))
8649                 return;
8650         rpc_put_task(task);
8651 }
8652
8653 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8654                 const nfs4_stateid *s2)
8655 {
8656         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8657                 return false;
8658
8659         if (s1->seqid == s2->seqid)
8660                 return true;
8661         if (s1->seqid == 0 || s2->seqid == 0)
8662                 return true;
8663
8664         return false;
8665 }
8666
8667 #endif /* CONFIG_NFS_V4_1 */
8668
8669 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8670                 const nfs4_stateid *s2)
8671 {
8672         return nfs4_stateid_match(s1, s2);
8673 }
8674
8675
8676 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8677         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8678         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8679         .recover_open   = nfs4_open_reclaim,
8680         .recover_lock   = nfs4_lock_reclaim,
8681         .establish_clid = nfs4_init_clientid,
8682         .detect_trunking = nfs40_discover_server_trunking,
8683 };
8684
8685 #if defined(CONFIG_NFS_V4_1)
8686 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8687         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8688         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8689         .recover_open   = nfs4_open_reclaim,
8690         .recover_lock   = nfs4_lock_reclaim,
8691         .establish_clid = nfs41_init_clientid,
8692         .reclaim_complete = nfs41_proc_reclaim_complete,
8693         .detect_trunking = nfs41_discover_server_trunking,
8694 };
8695 #endif /* CONFIG_NFS_V4_1 */
8696
8697 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8698         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8699         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8700         .recover_open   = nfs40_open_expired,
8701         .recover_lock   = nfs4_lock_expired,
8702         .establish_clid = nfs4_init_clientid,
8703 };
8704
8705 #if defined(CONFIG_NFS_V4_1)
8706 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8707         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8708         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8709         .recover_open   = nfs41_open_expired,
8710         .recover_lock   = nfs41_lock_expired,
8711         .establish_clid = nfs41_init_clientid,
8712 };
8713 #endif /* CONFIG_NFS_V4_1 */
8714
8715 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8716         .sched_state_renewal = nfs4_proc_async_renew,
8717         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8718         .renew_lease = nfs4_proc_renew,
8719 };
8720
8721 #if defined(CONFIG_NFS_V4_1)
8722 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8723         .sched_state_renewal = nfs41_proc_async_sequence,
8724         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8725         .renew_lease = nfs4_proc_sequence,
8726 };
8727 #endif
8728
8729 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8730         .get_locations = _nfs40_proc_get_locations,
8731         .fsid_present = _nfs40_proc_fsid_present,
8732 };
8733
8734 #if defined(CONFIG_NFS_V4_1)
8735 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8736         .get_locations = _nfs41_proc_get_locations,
8737         .fsid_present = _nfs41_proc_fsid_present,
8738 };
8739 #endif  /* CONFIG_NFS_V4_1 */
8740
8741 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8742         .minor_version = 0,
8743         .init_caps = NFS_CAP_READDIRPLUS
8744                 | NFS_CAP_ATOMIC_OPEN
8745                 | NFS_CAP_POSIX_LOCK,
8746         .init_client = nfs40_init_client,
8747         .shutdown_client = nfs40_shutdown_client,
8748         .match_stateid = nfs4_match_stateid,
8749         .find_root_sec = nfs4_find_root_sec,
8750         .free_lock_state = nfs4_release_lockowner,
8751         .alloc_seqid = nfs_alloc_seqid,
8752         .call_sync_ops = &nfs40_call_sync_ops,
8753         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8754         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8755         .state_renewal_ops = &nfs40_state_renewal_ops,
8756         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8757 };
8758
8759 #if defined(CONFIG_NFS_V4_1)
8760 static struct nfs_seqid *
8761 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8762 {
8763         return NULL;
8764 }
8765
8766 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8767         .minor_version = 1,
8768         .init_caps = NFS_CAP_READDIRPLUS
8769                 | NFS_CAP_ATOMIC_OPEN
8770                 | NFS_CAP_POSIX_LOCK
8771                 | NFS_CAP_STATEID_NFSV41
8772                 | NFS_CAP_ATOMIC_OPEN_V1,
8773         .init_client = nfs41_init_client,
8774         .shutdown_client = nfs41_shutdown_client,
8775         .match_stateid = nfs41_match_stateid,
8776         .find_root_sec = nfs41_find_root_sec,
8777         .free_lock_state = nfs41_free_lock_state,
8778         .alloc_seqid = nfs_alloc_no_seqid,
8779         .call_sync_ops = &nfs41_call_sync_ops,
8780         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8781         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8782         .state_renewal_ops = &nfs41_state_renewal_ops,
8783         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8784 };
8785 #endif
8786
8787 #if defined(CONFIG_NFS_V4_2)
8788 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8789         .minor_version = 2,
8790         .init_caps = NFS_CAP_READDIRPLUS
8791                 | NFS_CAP_ATOMIC_OPEN
8792                 | NFS_CAP_POSIX_LOCK
8793                 | NFS_CAP_STATEID_NFSV41
8794                 | NFS_CAP_ATOMIC_OPEN_V1
8795                 | NFS_CAP_ALLOCATE
8796                 | NFS_CAP_DEALLOCATE
8797                 | NFS_CAP_SEEK
8798                 | NFS_CAP_LAYOUTSTATS
8799                 | NFS_CAP_CLONE,
8800         .init_client = nfs41_init_client,
8801         .shutdown_client = nfs41_shutdown_client,
8802         .match_stateid = nfs41_match_stateid,
8803         .find_root_sec = nfs41_find_root_sec,
8804         .free_lock_state = nfs41_free_lock_state,
8805         .call_sync_ops = &nfs41_call_sync_ops,
8806         .alloc_seqid = nfs_alloc_no_seqid,
8807         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8808         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8809         .state_renewal_ops = &nfs41_state_renewal_ops,
8810         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8811 };
8812 #endif
8813
8814 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8815         [0] = &nfs_v4_0_minor_ops,
8816 #if defined(CONFIG_NFS_V4_1)
8817         [1] = &nfs_v4_1_minor_ops,
8818 #endif
8819 #if defined(CONFIG_NFS_V4_2)
8820         [2] = &nfs_v4_2_minor_ops,
8821 #endif
8822 };
8823
8824 ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
8825 {
8826         ssize_t error, error2;
8827
8828         error = generic_listxattr(dentry, list, size);
8829         if (error < 0)
8830                 return error;
8831         if (list) {
8832                 list += error;
8833                 size -= error;
8834         }
8835
8836         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
8837         if (error2 < 0)
8838                 return error2;
8839         return error + error2;
8840 }
8841
8842 static const struct inode_operations nfs4_dir_inode_operations = {
8843         .create         = nfs_create,
8844         .lookup         = nfs_lookup,
8845         .atomic_open    = nfs_atomic_open,
8846         .link           = nfs_link,
8847         .unlink         = nfs_unlink,
8848         .symlink        = nfs_symlink,
8849         .mkdir          = nfs_mkdir,
8850         .rmdir          = nfs_rmdir,
8851         .mknod          = nfs_mknod,
8852         .rename         = nfs_rename,
8853         .permission     = nfs_permission,
8854         .getattr        = nfs_getattr,
8855         .setattr        = nfs_setattr,
8856         .getxattr       = generic_getxattr,
8857         .setxattr       = generic_setxattr,
8858         .listxattr      = nfs4_listxattr,
8859         .removexattr    = generic_removexattr,
8860 };
8861
8862 static const struct inode_operations nfs4_file_inode_operations = {
8863         .permission     = nfs_permission,
8864         .getattr        = nfs_getattr,
8865         .setattr        = nfs_setattr,
8866         .getxattr       = generic_getxattr,
8867         .setxattr       = generic_setxattr,
8868         .listxattr      = nfs4_listxattr,
8869         .removexattr    = generic_removexattr,
8870 };
8871
8872 const struct nfs_rpc_ops nfs_v4_clientops = {
8873         .version        = 4,                    /* protocol version */
8874         .dentry_ops     = &nfs4_dentry_operations,
8875         .dir_inode_ops  = &nfs4_dir_inode_operations,
8876         .file_inode_ops = &nfs4_file_inode_operations,
8877         .file_ops       = &nfs4_file_operations,
8878         .getroot        = nfs4_proc_get_root,
8879         .submount       = nfs4_submount,
8880         .try_mount      = nfs4_try_mount,
8881         .getattr        = nfs4_proc_getattr,
8882         .setattr        = nfs4_proc_setattr,
8883         .lookup         = nfs4_proc_lookup,
8884         .access         = nfs4_proc_access,
8885         .readlink       = nfs4_proc_readlink,
8886         .create         = nfs4_proc_create,
8887         .remove         = nfs4_proc_remove,
8888         .unlink_setup   = nfs4_proc_unlink_setup,
8889         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8890         .unlink_done    = nfs4_proc_unlink_done,
8891         .rename_setup   = nfs4_proc_rename_setup,
8892         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8893         .rename_done    = nfs4_proc_rename_done,
8894         .link           = nfs4_proc_link,
8895         .symlink        = nfs4_proc_symlink,
8896         .mkdir          = nfs4_proc_mkdir,
8897         .rmdir          = nfs4_proc_remove,
8898         .readdir        = nfs4_proc_readdir,
8899         .mknod          = nfs4_proc_mknod,
8900         .statfs         = nfs4_proc_statfs,
8901         .fsinfo         = nfs4_proc_fsinfo,
8902         .pathconf       = nfs4_proc_pathconf,
8903         .set_capabilities = nfs4_server_capabilities,
8904         .decode_dirent  = nfs4_decode_dirent,
8905         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8906         .read_setup     = nfs4_proc_read_setup,
8907         .read_done      = nfs4_read_done,
8908         .write_setup    = nfs4_proc_write_setup,
8909         .write_done     = nfs4_write_done,
8910         .commit_setup   = nfs4_proc_commit_setup,
8911         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8912         .commit_done    = nfs4_commit_done,
8913         .lock           = nfs4_proc_lock,
8914         .clear_acl_cache = nfs4_zap_acl_attr,
8915         .close_context  = nfs4_close_context,
8916         .open_context   = nfs4_atomic_open,
8917         .have_delegation = nfs4_have_delegation,
8918         .return_delegation = nfs4_inode_return_delegation,
8919         .alloc_client   = nfs4_alloc_client,
8920         .init_client    = nfs4_init_client,
8921         .free_client    = nfs4_free_client,
8922         .create_server  = nfs4_create_server,
8923         .clone_server   = nfs_clone_server,
8924 };
8925
8926 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8927         .name   = XATTR_NAME_NFSV4_ACL,
8928         .list   = nfs4_xattr_list_nfs4_acl,
8929         .get    = nfs4_xattr_get_nfs4_acl,
8930         .set    = nfs4_xattr_set_nfs4_acl,
8931 };
8932
8933 const struct xattr_handler *nfs4_xattr_handlers[] = {
8934         &nfs4_xattr_nfs4_acl_handler,
8935 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8936         &nfs4_xattr_nfs4_label_handler,
8937 #endif
8938         NULL
8939 };
8940
8941 /*
8942  * Local variables:
8943  *  c-basic-offset: 8
8944  * End:
8945  */