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/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.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 "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  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_ACCESS:
 162                 return -EACCES;
 163         case -NFS4ERR_FILE_OPEN:
 164                 return -EBUSY;
 165         default:
 166                 dprintk("%s could not handle NFSv4 error %d\n",
 167                                 __func__, -err);
 168                 break;
 169         }
 170         return -EIO;
 171 }
 172
 173 /*
 174  * This is our standard bitmap for GETATTR requests.
 175  */
 176 const u32 nfs4_fattr_bitmap[3] = {
 177         FATTR4_WORD0_TYPE
 178         | FATTR4_WORD0_CHANGE
 179         | FATTR4_WORD0_SIZE
 180         | FATTR4_WORD0_FSID
 181         | FATTR4_WORD0_FILEID,
 182         FATTR4_WORD1_MODE
 183         | FATTR4_WORD1_NUMLINKS
 184         | FATTR4_WORD1_OWNER
 185         | FATTR4_WORD1_OWNER_GROUP
 186         | FATTR4_WORD1_RAWDEV
 187         | FATTR4_WORD1_SPACE_USED
 188         | FATTR4_WORD1_TIME_ACCESS
 189         | FATTR4_WORD1_TIME_METADATA
 190         | FATTR4_WORD1_TIME_MODIFY,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 318 {
 319         int res = 0;
 320
 321         might_sleep();
 322
 323         if (*timeout <= 0)
 324                 *timeout = NFS4_POLL_RETRY_MIN;
 325         if (*timeout > NFS4_POLL_RETRY_MAX)
 326                 *timeout = NFS4_POLL_RETRY_MAX;
 327         freezable_schedule_timeout_killable_unsafe(*timeout);
 328         if (fatal_signal_pending(current))
 329                 res = -ERESTARTSYS;
 330         *timeout <<= 1;
 331         return res;
 332 }
 333
 334 /* This is the error handling routine for processes that are allowed
 335  * to sleep.
 336  */
 337 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 338 {
 339         struct nfs_client *clp = server->nfs_client;
 340         struct nfs4_state *state = exception->state;
 341         struct inode *inode = exception->inode;
 342         int ret = errorcode;
 343
 344         exception->retry = 0;
 345         switch(errorcode) {
 346                 case 0:
 347                         return 0;
 348                 case -NFS4ERR_OPENMODE:
 349                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 350                                 nfs4_inode_return_delegation(inode);
 351                                 exception->retry = 1;
 352                                 return 0;
 353                         }
 354                         if (state == NULL)
 355                                 break;
 356                         ret = nfs4_schedule_stateid_recovery(server, state);
 357                         if (ret < 0)
 358                                 break;
 359                         goto wait_on_recovery;
 360                 case -NFS4ERR_DELEG_REVOKED:
 361                 case -NFS4ERR_ADMIN_REVOKED:
 362                 case -NFS4ERR_BAD_STATEID:
 363                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 364                                 nfs_remove_bad_delegation(inode);
 365                                 exception->retry = 1;
 366                                 break;
 367                         }
 368                         if (state == NULL)
 369                                 break;
 370                         ret = nfs4_schedule_stateid_recovery(server, state);
 371                         if (ret < 0)
 372                                 break;
 373                         goto wait_on_recovery;
 374                 case -NFS4ERR_EXPIRED:
 375                         if (state != NULL) {
 376                                 ret = nfs4_schedule_stateid_recovery(server, state);
 377                                 if (ret < 0)
 378                                         break;
 379                         }
 380                 case -NFS4ERR_STALE_STATEID:
 381                 case -NFS4ERR_STALE_CLIENTID:
 382                         nfs4_schedule_lease_recovery(clp);
 383                         goto wait_on_recovery;
 384                 case -NFS4ERR_MOVED:
 385                         ret = nfs4_schedule_migration_recovery(server);
 386                         if (ret < 0)
 387                                 break;
 388                         goto wait_on_recovery;
 389                 case -NFS4ERR_LEASE_MOVED:
 390                         nfs4_schedule_lease_moved_recovery(clp);
 391                         goto wait_on_recovery;
 392 #if defined(CONFIG_NFS_V4_1)
 393                 case -NFS4ERR_BADSESSION:
 394                 case -NFS4ERR_BADSLOT:
 395                 case -NFS4ERR_BAD_HIGH_SLOT:
 396                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 397                 case -NFS4ERR_DEADSESSION:
 398                 case -NFS4ERR_SEQ_FALSE_RETRY:
 399                 case -NFS4ERR_SEQ_MISORDERED:
 400                         dprintk("%s ERROR: %d Reset session\n", __func__,
 401                                 errorcode);
 402                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 403                         goto wait_on_recovery;
 404 #endif /* defined(CONFIG_NFS_V4_1) */
 405                 case -NFS4ERR_FILE_OPEN:
 406                         if (exception->timeout > HZ) {
 407                                 /* We have retried a decent amount, time to
 408                                  * fail
 409                                  */
 410                                 ret = -EBUSY;
 411                                 break;
 412                         }
 413                 case -NFS4ERR_GRACE:
 414                 case -NFS4ERR_DELAY:
 415                         ret = nfs4_delay(server->client, &exception->timeout);
 416                         if (ret != 0)
 417                                 break;
 418                 case -NFS4ERR_RETRY_UNCACHED_REP:
 419                 case -NFS4ERR_OLD_STATEID:
 420                         exception->retry = 1;
 421                         break;
 422                 case -NFS4ERR_BADOWNER:
 423                         /* The following works around a Linux server bug! */
 424                 case -NFS4ERR_BADNAME:
 425                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 426                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 427                                 exception->retry = 1;
 428                                 printk(KERN_WARNING "NFS: v4 server %s "
 429                                                 "does not accept raw "
 430                                                 "uid/gids. "
 431                                                 "Reenabling the idmapper.\n",
 432                                                 server->nfs_client->cl_hostname);
 433                         }
 434         }
 435         /* We failed to handle the error */
 436         return nfs4_map_errors(ret);
 437 wait_on_recovery:
 438         ret = nfs4_wait_clnt_recover(clp);
 439         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 440                 return -EIO;
 441         if (ret == 0)
 442                 exception->retry = 1;
 443         return ret;
 444 }
 445
 446 /*
 447  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 448  * or 'false' otherwise.
 449  */
 450 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 451 {
 452         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 453
 454         if (flavor == RPC_AUTH_GSS_KRB5I ||
 455             flavor == RPC_AUTH_GSS_KRB5P)
 456                 return true;
 457
 458         return false;
 459 }
 460
 461 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 462 {
 463         spin_lock(&clp->cl_lock);
 464         if (time_before(clp->cl_last_renewal,timestamp))
 465                 clp->cl_last_renewal = timestamp;
 466         spin_unlock(&clp->cl_lock);
 467 }
 468
 469 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 470 {
 471         do_renew_lease(server->nfs_client, timestamp);
 472 }
 473
 474 struct nfs4_call_sync_data {
 475         const struct nfs_server *seq_server;
 476         struct nfs4_sequence_args *seq_args;
 477         struct nfs4_sequence_res *seq_res;
 478 };
 479
 480 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 481                                struct nfs4_sequence_res *res, int cache_reply)
 482 {
 483         args->sa_slot = NULL;
 484         args->sa_cache_this = cache_reply;
 485         args->sa_privileged = 0;
 486
 487         res->sr_slot = NULL;
 488 }
 489
 490 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 491 {
 492         args->sa_privileged = 1;
 493 }
 494
 495 static int nfs40_setup_sequence(const struct nfs_server *server,
 496                                 struct nfs4_sequence_args *args,
 497                                 struct nfs4_sequence_res *res,
 498                                 struct rpc_task *task)
 499 {
 500         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 501         struct nfs4_slot *slot;
 502
 503         /* slot already allocated? */
 504         if (res->sr_slot != NULL)
 505                 goto out_start;
 506
 507         spin_lock(&tbl->slot_tbl_lock);
 508         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 509                 goto out_sleep;
 510
 511         slot = nfs4_alloc_slot(tbl);
 512         if (IS_ERR(slot)) {
 513                 if (slot == ERR_PTR(-ENOMEM))
 514                         task->tk_timeout = HZ >> 2;
 515                 goto out_sleep;
 516         }
 517         spin_unlock(&tbl->slot_tbl_lock);
 518
 519         args->sa_slot = slot;
 520         res->sr_slot = slot;
 521
 522 out_start:
 523         rpc_call_start(task);
 524         return 0;
 525
 526 out_sleep:
 527         if (args->sa_privileged)
 528                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 529                                 NULL, RPC_PRIORITY_PRIVILEGED);
 530         else
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532         spin_unlock(&tbl->slot_tbl_lock);
 533         return -EAGAIN;
 534 }
 535
 536 static int nfs40_sequence_done(struct rpc_task *task,
 537                                struct nfs4_sequence_res *res)
 538 {
 539         struct nfs4_slot *slot = res->sr_slot;
 540         struct nfs4_slot_table *tbl;
 541
 542         if (!RPC_WAS_SENT(task))
 543                 goto out;
 544
 545         tbl = slot->table;
 546         spin_lock(&tbl->slot_tbl_lock);
 547         if (!nfs41_wake_and_assign_slot(tbl, slot))
 548                 nfs4_free_slot(tbl, slot);
 549         spin_unlock(&tbl->slot_tbl_lock);
 550
 551         res->sr_slot = NULL;
 552 out:
 553         return 1;
 554 }
 555
 556 #if defined(CONFIG_NFS_V4_1)
 557
 558 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 559 {
 560         struct nfs4_session *session;
 561         struct nfs4_slot_table *tbl;
 562         bool send_new_highest_used_slotid = false;
 563
 564         if (!res->sr_slot) {
 565                 /* just wake up the next guy waiting since
 566                  * we may have not consumed a slot after all */
 567                 dprintk("%s: No slot\n", __func__);
 568                 return;
 569         }
 570         tbl = res->sr_slot->table;
 571         session = tbl->session;
 572
 573         spin_lock(&tbl->slot_tbl_lock);
 574         /* Be nice to the server: try to ensure that the last transmitted
 575          * value for highest_user_slotid <= target_highest_slotid
 576          */
 577         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 578                 send_new_highest_used_slotid = true;
 579
 580         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 581                 send_new_highest_used_slotid = false;
 582                 goto out_unlock;
 583         }
 584         nfs4_free_slot(tbl, res->sr_slot);
 585
 586         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 587                 send_new_highest_used_slotid = false;
 588 out_unlock:
 589         spin_unlock(&tbl->slot_tbl_lock);
 590         res->sr_slot = NULL;
 591         if (send_new_highest_used_slotid)
 592                 nfs41_server_notify_highest_slotid_update(session->clp);
 593 }
 594
 595 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 596 {
 597         struct nfs4_session *session;
 598         struct nfs4_slot *slot;
 599         struct nfs_client *clp;
 600         bool interrupted = false;
 601         int ret = 1;
 602
 603         /* don't increment the sequence number if the task wasn't sent */
 604         if (!RPC_WAS_SENT(task))
 605                 goto out;
 606
 607         slot = res->sr_slot;
 608         session = slot->table->session;
 609
 610         if (slot->interrupted) {
 611                 slot->interrupted = 0;
 612                 interrupted = true;
 613         }
 614
 615         trace_nfs4_sequence_done(session, res);
 616         /* Check the SEQUENCE operation status */
 617         switch (res->sr_status) {
 618         case 0:
 619                 /* Update the slot's sequence and clientid lease timer */
 620                 ++slot->seq_nr;
 621                 clp = session->clp;
 622                 do_renew_lease(clp, res->sr_timestamp);
 623                 /* Check sequence flags */
 624                 if (res->sr_status_flags != 0)
 625                         nfs4_schedule_lease_recovery(clp);
 626                 nfs41_update_target_slotid(slot->table, slot, res);
 627                 break;
 628         case 1:
 629                 /*
 630                  * sr_status remains 1 if an RPC level error occurred.
 631                  * The server may or may not have processed the sequence
 632                  * operation..
 633                  * Mark the slot as having hosted an interrupted RPC call.
 634                  */
 635                 slot->interrupted = 1;
 636                 goto out;
 637         case -NFS4ERR_DELAY:
 638                 /* The server detected a resend of the RPC call and
 639                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 640                  * of RFC5661.
 641                  */
 642                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 643                         __func__,
 644                         slot->slot_nr,
 645                         slot->seq_nr);
 646                 goto out_retry;
 647         case -NFS4ERR_BADSLOT:
 648                 /*
 649                  * The slot id we used was probably retired. Try again
 650                  * using a different slot id.
 651                  */
 652                 goto retry_nowait;
 653         case -NFS4ERR_SEQ_MISORDERED:
 654                 /*
 655                  * Was the last operation on this sequence interrupted?
 656                  * If so, retry after bumping the sequence number.
 657                  */
 658                 if (interrupted) {
 659                         ++slot->seq_nr;
 660                         goto retry_nowait;
 661                 }
 662                 /*
 663                  * Could this slot have been previously retired?
 664                  * If so, then the server may be expecting seq_nr = 1!
 665                  */
 666                 if (slot->seq_nr != 1) {
 667                         slot->seq_nr = 1;
 668                         goto retry_nowait;
 669                 }
 670                 break;
 671         case -NFS4ERR_SEQ_FALSE_RETRY:
 672                 ++slot->seq_nr;
 673                 goto retry_nowait;
 674         default:
 675                 /* Just update the slot sequence no. */
 676                 ++slot->seq_nr;
 677         }
 678 out:
 679         /* The session may be reset by one of the error handlers. */
 680         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 681         nfs41_sequence_free_slot(res);
 682         return ret;
 683 retry_nowait:
 684         if (rpc_restart_call_prepare(task)) {
 685                 task->tk_status = 0;
 686                 ret = 0;
 687         }
 688         goto out;
 689 out_retry:
 690         if (!rpc_restart_call(task))
 691                 goto out;
 692         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 693         return 0;
 694 }
 695
 696 static int nfs4_sequence_done(struct rpc_task *task,
 697                                struct nfs4_sequence_res *res)
 698 {
 699         if (res->sr_slot == NULL)
 700                 return 1;
 701         if (!res->sr_slot->table->session)
 702                 return nfs40_sequence_done(task, res);
 703         return nfs41_sequence_done(task, res);
 704 }
 705
 706 int nfs41_setup_sequence(struct nfs4_session *session,
 707                                 struct nfs4_sequence_args *args,
 708                                 struct nfs4_sequence_res *res,
 709                                 struct rpc_task *task)
 710 {
 711         struct nfs4_slot *slot;
 712         struct nfs4_slot_table *tbl;
 713
 714         dprintk("--> %s\n", __func__);
 715         /* slot already allocated? */
 716         if (res->sr_slot != NULL)
 717                 goto out_success;
 718
 719         tbl = &session->fc_slot_table;
 720
 721         task->tk_timeout = 0;
 722
 723         spin_lock(&tbl->slot_tbl_lock);
 724         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 725             !args->sa_privileged) {
 726                 /* The state manager will wait until the slot table is empty */
 727                 dprintk("%s session is draining\n", __func__);
 728                 goto out_sleep;
 729         }
 730
 731         slot = nfs4_alloc_slot(tbl);
 732         if (IS_ERR(slot)) {
 733                 /* If out of memory, try again in 1/4 second */
 734                 if (slot == ERR_PTR(-ENOMEM))
 735                         task->tk_timeout = HZ >> 2;
 736                 dprintk("<-- %s: no free slots\n", __func__);
 737                 goto out_sleep;
 738         }
 739         spin_unlock(&tbl->slot_tbl_lock);
 740
 741         args->sa_slot = slot;
 742
 743         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 744                         slot->slot_nr, slot->seq_nr);
 745
 746         res->sr_slot = slot;
 747         res->sr_timestamp = jiffies;
 748         res->sr_status_flags = 0;
 749         /*
 750          * sr_status is only set in decode_sequence, and so will remain
 751          * set to 1 if an rpc level failure occurs.
 752          */
 753         res->sr_status = 1;
 754         trace_nfs4_setup_sequence(session, args);
 755 out_success:
 756         rpc_call_start(task);
 757         return 0;
 758 out_sleep:
 759         /* Privileged tasks are queued with top priority */
 760         if (args->sa_privileged)
 761                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 762                                 NULL, RPC_PRIORITY_PRIVILEGED);
 763         else
 764                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 765         spin_unlock(&tbl->slot_tbl_lock);
 766         return -EAGAIN;
 767 }
 768 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 769
 770 static int nfs4_setup_sequence(const struct nfs_server *server,
 771                                struct nfs4_sequence_args *args,
 772                                struct nfs4_sequence_res *res,
 773                                struct rpc_task *task)
 774 {
 775         struct nfs4_session *session = nfs4_get_session(server);
 776         int ret = 0;
 777
 778         if (!session)
 779                 return nfs40_setup_sequence(server, args, res, task);
 780
 781         dprintk("--> %s clp %p session %p sr_slot %u\n",
 782                 __func__, session->clp, session, res->sr_slot ?
 783                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 784
 785         ret = nfs41_setup_sequence(session, args, res, task);
 786
 787         dprintk("<-- %s status=%d\n", __func__, ret);
 788         return ret;
 789 }
 790
 791 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 792 {
 793         struct nfs4_call_sync_data *data = calldata;
 794         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 795
 796         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 797
 798         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 799 }
 800
 801 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 802 {
 803         struct nfs4_call_sync_data *data = calldata;
 804
 805         nfs41_sequence_done(task, data->seq_res);
 806 }
 807
 808 static const struct rpc_call_ops nfs41_call_sync_ops = {
 809         .rpc_call_prepare = nfs41_call_sync_prepare,
 810         .rpc_call_done = nfs41_call_sync_done,
 811 };
 812
 813 #else   /* !CONFIG_NFS_V4_1 */
 814
 815 static int nfs4_setup_sequence(const struct nfs_server *server,
 816                                struct nfs4_sequence_args *args,
 817                                struct nfs4_sequence_res *res,
 818                                struct rpc_task *task)
 819 {
 820         return nfs40_setup_sequence(server, args, res, task);
 821 }
 822
 823 static int nfs4_sequence_done(struct rpc_task *task,
 824                                struct nfs4_sequence_res *res)
 825 {
 826         return nfs40_sequence_done(task, res);
 827 }
 828
 829 #endif  /* !CONFIG_NFS_V4_1 */
 830
 831 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 832 {
 833         struct nfs4_call_sync_data *data = calldata;
 834         nfs4_setup_sequence(data->seq_server,
 835                                 data->seq_args, data->seq_res, task);
 836 }
 837
 838 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 839 {
 840         struct nfs4_call_sync_data *data = calldata;
 841         nfs4_sequence_done(task, data->seq_res);
 842 }
 843
 844 static const struct rpc_call_ops nfs40_call_sync_ops = {
 845         .rpc_call_prepare = nfs40_call_sync_prepare,
 846         .rpc_call_done = nfs40_call_sync_done,
 847 };
 848
 849 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 850                                    struct nfs_server *server,
 851                                    struct rpc_message *msg,
 852                                    struct nfs4_sequence_args *args,
 853                                    struct nfs4_sequence_res *res)
 854 {
 855         int ret;
 856         struct rpc_task *task;
 857         struct nfs_client *clp = server->nfs_client;
 858         struct nfs4_call_sync_data data = {
 859                 .seq_server = server,
 860                 .seq_args = args,
 861                 .seq_res = res,
 862         };
 863         struct rpc_task_setup task_setup = {
 864                 .rpc_client = clnt,
 865                 .rpc_message = msg,
 866                 .callback_ops = clp->cl_mvops->call_sync_ops,
 867                 .callback_data = &data
 868         };
 869
 870         task = rpc_run_task(&task_setup);
 871         if (IS_ERR(task))
 872                 ret = PTR_ERR(task);
 873         else {
 874                 ret = task->tk_status;
 875                 rpc_put_task(task);
 876         }
 877         return ret;
 878 }
 879
 880 static
 881 int nfs4_call_sync(struct rpc_clnt *clnt,
 882                    struct nfs_server *server,
 883                    struct rpc_message *msg,
 884                    struct nfs4_sequence_args *args,
 885                    struct nfs4_sequence_res *res,
 886                    int cache_reply)
 887 {
 888         nfs4_init_sequence(args, res, cache_reply);
 889         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 890 }
 891
 892 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 893 {
 894         struct nfs_inode *nfsi = NFS_I(dir);
 895
 896         spin_lock(&dir->i_lock);
 897         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 898         if (!cinfo->atomic || cinfo->before != dir->i_version)
 899                 nfs_force_lookup_revalidate(dir);
 900         dir->i_version = cinfo->after;
 901         nfs_fscache_invalidate(dir);
 902         spin_unlock(&dir->i_lock);
 903 }
 904
 905 struct nfs4_opendata {
 906         struct kref kref;
 907         struct nfs_openargs o_arg;
 908         struct nfs_openres o_res;
 909         struct nfs_open_confirmargs c_arg;
 910         struct nfs_open_confirmres c_res;
 911         struct nfs4_string owner_name;
 912         struct nfs4_string group_name;
 913         struct nfs_fattr f_attr;
 914         struct nfs4_label *f_label;
 915         struct dentry *dir;
 916         struct dentry *dentry;
 917         struct nfs4_state_owner *owner;
 918         struct nfs4_state *state;
 919         struct iattr attrs;
 920         unsigned long timestamp;
 921         unsigned int rpc_done : 1;
 922         unsigned int file_created : 1;
 923         unsigned int is_recover : 1;
 924         int rpc_status;
 925         int cancelled;
 926 };
 927
 928 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 929                 int err, struct nfs4_exception *exception)
 930 {
 931         if (err != -EINVAL)
 932                 return false;
 933         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 934                 return false;
 935         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 936         exception->retry = 1;
 937         return true;
 938 }
 939
 940 static enum open_claim_type4
 941 nfs4_map_atomic_open_claim(struct nfs_server *server,
 942                 enum open_claim_type4 claim)
 943 {
 944         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 945                 return claim;
 946         switch (claim) {
 947         default:
 948                 return claim;
 949         case NFS4_OPEN_CLAIM_FH:
 950                 return NFS4_OPEN_CLAIM_NULL;
 951         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 952                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 953         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 954                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 955         }
 956 }
 957
 958 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 959 {
 960         p->o_res.f_attr = &p->f_attr;
 961         p->o_res.f_label = p->f_label;
 962         p->o_res.seqid = p->o_arg.seqid;
 963         p->c_res.seqid = p->c_arg.seqid;
 964         p->o_res.server = p->o_arg.server;
 965         p->o_res.access_request = p->o_arg.access;
 966         nfs_fattr_init(&p->f_attr);
 967         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 968 }
 969
 970 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 971                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 972                 const struct iattr *attrs,
 973                 struct nfs4_label *label,
 974                 enum open_claim_type4 claim,
 975                 gfp_t gfp_mask)
 976 {
 977         struct dentry *parent = dget_parent(dentry);
 978         struct inode *dir = parent->d_inode;
 979         struct nfs_server *server = NFS_SERVER(dir);
 980         struct nfs4_opendata *p;
 981
 982         p = kzalloc(sizeof(*p), gfp_mask);
 983         if (p == NULL)
 984                 goto err;
 985
 986         p->f_label = nfs4_label_alloc(server, gfp_mask);
 987         if (IS_ERR(p->f_label))
 988                 goto err_free_p;
 989
 990         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 991         if (p->o_arg.seqid == NULL)
 992                 goto err_free_label;
 993         nfs_sb_active(dentry->d_sb);
 994         p->dentry = dget(dentry);
 995         p->dir = parent;
 996         p->owner = sp;
 997         atomic_inc(&sp->so_count);
 998         p->o_arg.open_flags = flags;
 999         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1000         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1001          * will return permission denied for all bits until close */
1002         if (!(flags & O_EXCL)) {
1003                 /* ask server to check for all possible rights as results
1004                  * are cached */
1005                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1006                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1007         }
1008         p->o_arg.clientid = server->nfs_client->cl_clientid;
1009         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1010         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1011         p->o_arg.name = &dentry->d_name;
1012         p->o_arg.server = server;
1013         p->o_arg.bitmask = nfs4_bitmask(server, label);
1014         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1015         p->o_arg.label = label;
1016         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1017         switch (p->o_arg.claim) {
1018         case NFS4_OPEN_CLAIM_NULL:
1019         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1020         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1021                 p->o_arg.fh = NFS_FH(dir);
1022                 break;
1023         case NFS4_OPEN_CLAIM_PREVIOUS:
1024         case NFS4_OPEN_CLAIM_FH:
1025         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1026         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1027                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1028         }
1029         if (attrs != NULL && attrs->ia_valid != 0) {
1030                 __u32 verf[2];
1031
1032                 p->o_arg.u.attrs = &p->attrs;
1033                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1034
1035                 verf[0] = jiffies;
1036                 verf[1] = current->pid;
1037                 memcpy(p->o_arg.u.verifier.data, verf,
1038                                 sizeof(p->o_arg.u.verifier.data));
1039         }
1040         p->c_arg.fh = &p->o_res.fh;
1041         p->c_arg.stateid = &p->o_res.stateid;
1042         p->c_arg.seqid = p->o_arg.seqid;
1043         nfs4_init_opendata_res(p);
1044         kref_init(&p->kref);
1045         return p;
1046
1047 err_free_label:
1048         nfs4_label_free(p->f_label);
1049 err_free_p:
1050         kfree(p);
1051 err:
1052         dput(parent);
1053         return NULL;
1054 }
1055
1056 static void nfs4_opendata_free(struct kref *kref)
1057 {
1058         struct nfs4_opendata *p = container_of(kref,
1059                         struct nfs4_opendata, kref);
1060         struct super_block *sb = p->dentry->d_sb;
1061
1062         nfs_free_seqid(p->o_arg.seqid);
1063         if (p->state != NULL)
1064                 nfs4_put_open_state(p->state);
1065         nfs4_put_state_owner(p->owner);
1066
1067         nfs4_label_free(p->f_label);
1068
1069         dput(p->dir);
1070         dput(p->dentry);
1071         nfs_sb_deactive(sb);
1072         nfs_fattr_free_names(&p->f_attr);
1073         kfree(p);
1074 }
1075
1076 static void nfs4_opendata_put(struct nfs4_opendata *p)
1077 {
1078         if (p != NULL)
1079                 kref_put(&p->kref, nfs4_opendata_free);
1080 }
1081
1082 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1083 {
1084         int ret;
1085
1086         ret = rpc_wait_for_completion_task(task);
1087         return ret;
1088 }
1089
1090 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1091 {
1092         int ret = 0;
1093
1094         if (open_mode & (O_EXCL|O_TRUNC))
1095                 goto out;
1096         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1097                 case FMODE_READ:
1098                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1099                                 && state->n_rdonly != 0;
1100                         break;
1101                 case FMODE_WRITE:
1102                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1103                                 && state->n_wronly != 0;
1104                         break;
1105                 case FMODE_READ|FMODE_WRITE:
1106                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1107                                 && state->n_rdwr != 0;
1108         }
1109 out:
1110         return ret;
1111 }
1112
1113 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1114 {
1115         if (delegation == NULL)
1116                 return 0;
1117         if ((delegation->type & fmode) != fmode)
1118                 return 0;
1119         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1120                 return 0;
1121         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1122                 return 0;
1123         nfs_mark_delegation_referenced(delegation);
1124         return 1;
1125 }
1126
1127 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1128 {
1129         switch (fmode) {
1130                 case FMODE_WRITE:
1131                         state->n_wronly++;
1132                         break;
1133                 case FMODE_READ:
1134                         state->n_rdonly++;
1135                         break;
1136                 case FMODE_READ|FMODE_WRITE:
1137                         state->n_rdwr++;
1138         }
1139         nfs4_state_set_mode_locked(state, state->state | fmode);
1140 }
1141
1142 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1143 {
1144         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1145                 nfs4_stateid_copy(&state->stateid, stateid);
1146         nfs4_stateid_copy(&state->open_stateid, stateid);
1147         set_bit(NFS_OPEN_STATE, &state->flags);
1148         switch (fmode) {
1149                 case FMODE_READ:
1150                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1151                         break;
1152                 case FMODE_WRITE:
1153                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1154                         break;
1155                 case FMODE_READ|FMODE_WRITE:
1156                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1157         }
1158 }
1159
1160 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1161 {
1162         write_seqlock(&state->seqlock);
1163         nfs_set_open_stateid_locked(state, stateid, fmode);
1164         write_sequnlock(&state->seqlock);
1165 }
1166
1167 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1168 {
1169         /*
1170          * Protect the call to nfs4_state_set_mode_locked and
1171          * serialise the stateid update
1172          */
1173         write_seqlock(&state->seqlock);
1174         if (deleg_stateid != NULL) {
1175                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1176                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1177         }
1178         if (open_stateid != NULL)
1179                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1180         write_sequnlock(&state->seqlock);
1181         spin_lock(&state->owner->so_lock);
1182         update_open_stateflags(state, fmode);
1183         spin_unlock(&state->owner->so_lock);
1184 }
1185
1186 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1187 {
1188         struct nfs_inode *nfsi = NFS_I(state->inode);
1189         struct nfs_delegation *deleg_cur;
1190         int ret = 0;
1191
1192         fmode &= (FMODE_READ|FMODE_WRITE);
1193
1194         rcu_read_lock();
1195         deleg_cur = rcu_dereference(nfsi->delegation);
1196         if (deleg_cur == NULL)
1197                 goto no_delegation;
1198
1199         spin_lock(&deleg_cur->lock);
1200         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1201            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1202             (deleg_cur->type & fmode) != fmode)
1203                 goto no_delegation_unlock;
1204
1205         if (delegation == NULL)
1206                 delegation = &deleg_cur->stateid;
1207         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1208                 goto no_delegation_unlock;
1209
1210         nfs_mark_delegation_referenced(deleg_cur);
1211         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1212         ret = 1;
1213 no_delegation_unlock:
1214         spin_unlock(&deleg_cur->lock);
1215 no_delegation:
1216         rcu_read_unlock();
1217
1218         if (!ret && open_stateid != NULL) {
1219                 __update_open_stateid(state, open_stateid, NULL, fmode);
1220                 ret = 1;
1221         }
1222
1223         return ret;
1224 }
1225
1226
1227 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1228 {
1229         struct nfs_delegation *delegation;
1230
1231         rcu_read_lock();
1232         delegation = rcu_dereference(NFS_I(inode)->delegation);
1233         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1234                 rcu_read_unlock();
1235                 return;
1236         }
1237         rcu_read_unlock();
1238         nfs4_inode_return_delegation(inode);
1239 }
1240
1241 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1242 {
1243         struct nfs4_state *state = opendata->state;
1244         struct nfs_inode *nfsi = NFS_I(state->inode);
1245         struct nfs_delegation *delegation;
1246         int open_mode = opendata->o_arg.open_flags;
1247         fmode_t fmode = opendata->o_arg.fmode;
1248         nfs4_stateid stateid;
1249         int ret = -EAGAIN;
1250
1251         for (;;) {
1252                 if (can_open_cached(state, fmode, open_mode)) {
1253                         spin_lock(&state->owner->so_lock);
1254                         if (can_open_cached(state, fmode, open_mode)) {
1255                                 update_open_stateflags(state, fmode);
1256                                 spin_unlock(&state->owner->so_lock);
1257                                 goto out_return_state;
1258                         }
1259                         spin_unlock(&state->owner->so_lock);
1260                 }
1261                 rcu_read_lock();
1262                 delegation = rcu_dereference(nfsi->delegation);
1263                 if (!can_open_delegated(delegation, fmode)) {
1264                         rcu_read_unlock();
1265                         break;
1266                 }
1267                 /* Save the delegation */
1268                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1269                 rcu_read_unlock();
1270                 nfs_release_seqid(opendata->o_arg.seqid);
1271                 if (!opendata->is_recover) {
1272                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1273                         if (ret != 0)
1274                                 goto out;
1275                 }
1276                 ret = -EAGAIN;
1277
1278                 /* Try to update the stateid using the delegation */
1279                 if (update_open_stateid(state, NULL, &stateid, fmode))
1280                         goto out_return_state;
1281         }
1282 out:
1283         return ERR_PTR(ret);
1284 out_return_state:
1285         atomic_inc(&state->count);
1286         return state;
1287 }
1288
1289 static void
1290 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1291 {
1292         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1293         struct nfs_delegation *delegation;
1294         int delegation_flags = 0;
1295
1296         rcu_read_lock();
1297         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1298         if (delegation)
1299                 delegation_flags = delegation->flags;
1300         rcu_read_unlock();
1301         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1302                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1303                                    "returning a delegation for "
1304                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1305                                    clp->cl_hostname);
1306         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1307                 nfs_inode_set_delegation(state->inode,
1308                                          data->owner->so_cred,
1309                                          &data->o_res);
1310         else
1311                 nfs_inode_reclaim_delegation(state->inode,
1312                                              data->owner->so_cred,
1313                                              &data->o_res);
1314 }
1315
1316 /*
1317  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1318  * and update the nfs4_state.
1319  */
1320 static struct nfs4_state *
1321 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1322 {
1323         struct inode *inode = data->state->inode;
1324         struct nfs4_state *state = data->state;
1325         int ret;
1326
1327         if (!data->rpc_done) {
1328                 if (data->rpc_status) {
1329                         ret = data->rpc_status;
1330                         goto err;
1331                 }
1332                 /* cached opens have already been processed */
1333                 goto update;
1334         }
1335
1336         ret = nfs_refresh_inode(inode, &data->f_attr);
1337         if (ret)
1338                 goto err;
1339
1340         if (data->o_res.delegation_type != 0)
1341                 nfs4_opendata_check_deleg(data, state);
1342 update:
1343         update_open_stateid(state, &data->o_res.stateid, NULL,
1344                             data->o_arg.fmode);
1345         atomic_inc(&state->count);
1346
1347         return state;
1348 err:
1349         return ERR_PTR(ret);
1350
1351 }
1352
1353 static struct nfs4_state *
1354 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1355 {
1356         struct inode *inode;
1357         struct nfs4_state *state = NULL;
1358         int ret;
1359
1360         if (!data->rpc_done) {
1361                 state = nfs4_try_open_cached(data);
1362                 goto out;
1363         }
1364
1365         ret = -EAGAIN;
1366         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1367                 goto err;
1368         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1369         ret = PTR_ERR(inode);
1370         if (IS_ERR(inode))
1371                 goto err;
1372         ret = -ENOMEM;
1373         state = nfs4_get_open_state(inode, data->owner);
1374         if (state == NULL)
1375                 goto err_put_inode;
1376         if (data->o_res.delegation_type != 0)
1377                 nfs4_opendata_check_deleg(data, state);
1378         update_open_stateid(state, &data->o_res.stateid, NULL,
1379                         data->o_arg.fmode);
1380         iput(inode);
1381 out:
1382         nfs_release_seqid(data->o_arg.seqid);
1383         return state;
1384 err_put_inode:
1385         iput(inode);
1386 err:
1387         return ERR_PTR(ret);
1388 }
1389
1390 static struct nfs4_state *
1391 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1392 {
1393         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1394                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1395         return _nfs4_opendata_to_nfs4_state(data);
1396 }
1397
1398 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1399 {
1400         struct nfs_inode *nfsi = NFS_I(state->inode);
1401         struct nfs_open_context *ctx;
1402
1403         spin_lock(&state->inode->i_lock);
1404         list_for_each_entry(ctx, &nfsi->open_files, list) {
1405                 if (ctx->state != state)
1406                         continue;
1407                 get_nfs_open_context(ctx);
1408                 spin_unlock(&state->inode->i_lock);
1409                 return ctx;
1410         }
1411         spin_unlock(&state->inode->i_lock);
1412         return ERR_PTR(-ENOENT);
1413 }
1414
1415 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1416                 struct nfs4_state *state, enum open_claim_type4 claim)
1417 {
1418         struct nfs4_opendata *opendata;
1419
1420         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1421                         NULL, NULL, claim, GFP_NOFS);
1422         if (opendata == NULL)
1423                 return ERR_PTR(-ENOMEM);
1424         opendata->state = state;
1425         atomic_inc(&state->count);
1426         return opendata;
1427 }
1428
1429 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1430 {
1431         struct nfs4_state *newstate;
1432         int ret;
1433
1434         opendata->o_arg.open_flags = 0;
1435         opendata->o_arg.fmode = fmode;
1436         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1437         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1438         nfs4_init_opendata_res(opendata);
1439         ret = _nfs4_recover_proc_open(opendata);
1440         if (ret != 0)
1441                 return ret;
1442         newstate = nfs4_opendata_to_nfs4_state(opendata);
1443         if (IS_ERR(newstate))
1444                 return PTR_ERR(newstate);
1445         nfs4_close_state(newstate, fmode);
1446         *res = newstate;
1447         return 0;
1448 }
1449
1450 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1451 {
1452         struct nfs4_state *newstate;
1453         int ret;
1454
1455         /* memory barrier prior to reading state->n_* */
1456         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1457         clear_bit(NFS_OPEN_STATE, &state->flags);
1458         smp_rmb();
1459         if (state->n_rdwr != 0) {
1460                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1461                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1462                 if (ret != 0)
1463                         return ret;
1464                 if (newstate != state)
1465                         return -ESTALE;
1466         }
1467         if (state->n_wronly != 0) {
1468                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1469                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1470                 if (ret != 0)
1471                         return ret;
1472                 if (newstate != state)
1473                         return -ESTALE;
1474         }
1475         if (state->n_rdonly != 0) {
1476                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1477                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1478                 if (ret != 0)
1479                         return ret;
1480                 if (newstate != state)
1481                         return -ESTALE;
1482         }
1483         /*
1484          * We may have performed cached opens for all three recoveries.
1485          * Check if we need to update the current stateid.
1486          */
1487         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1488             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1489                 write_seqlock(&state->seqlock);
1490                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1491                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1492                 write_sequnlock(&state->seqlock);
1493         }
1494         return 0;
1495 }
1496
1497 /*
1498  * OPEN_RECLAIM:
1499  *      reclaim state on the server after a reboot.
1500  */
1501 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1502 {
1503         struct nfs_delegation *delegation;
1504         struct nfs4_opendata *opendata;
1505         fmode_t delegation_type = 0;
1506         int status;
1507
1508         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1509                         NFS4_OPEN_CLAIM_PREVIOUS);
1510         if (IS_ERR(opendata))
1511                 return PTR_ERR(opendata);
1512         rcu_read_lock();
1513         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1514         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1515                 delegation_type = delegation->type;
1516         rcu_read_unlock();
1517         opendata->o_arg.u.delegation_type = delegation_type;
1518         status = nfs4_open_recover(opendata, state);
1519         nfs4_opendata_put(opendata);
1520         return status;
1521 }
1522
1523 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1524 {
1525         struct nfs_server *server = NFS_SERVER(state->inode);
1526         struct nfs4_exception exception = { };
1527         int err;
1528         do {
1529                 err = _nfs4_do_open_reclaim(ctx, state);
1530                 trace_nfs4_open_reclaim(ctx, 0, err);
1531                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1532                         continue;
1533                 if (err != -NFS4ERR_DELAY)
1534                         break;
1535                 nfs4_handle_exception(server, err, &exception);
1536         } while (exception.retry);
1537         return err;
1538 }
1539
1540 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1541 {
1542         struct nfs_open_context *ctx;
1543         int ret;
1544
1545         ctx = nfs4_state_find_open_context(state);
1546         if (IS_ERR(ctx))
1547                 return -EAGAIN;
1548         ret = nfs4_do_open_reclaim(ctx, state);
1549         put_nfs_open_context(ctx);
1550         return ret;
1551 }
1552
1553 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1554 {
1555         switch (err) {
1556                 default:
1557                         printk(KERN_ERR "NFS: %s: unhandled error "
1558                                         "%d.\n", __func__, err);
1559                 case 0:
1560                 case -ENOENT:
1561                 case -ESTALE:
1562                         break;
1563                 case -NFS4ERR_BADSESSION:
1564                 case -NFS4ERR_BADSLOT:
1565                 case -NFS4ERR_BAD_HIGH_SLOT:
1566                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1567                 case -NFS4ERR_DEADSESSION:
1568                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1569                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1570                         return -EAGAIN;
1571                 case -NFS4ERR_STALE_CLIENTID:
1572                 case -NFS4ERR_STALE_STATEID:
1573                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1574                 case -NFS4ERR_EXPIRED:
1575                         /* Don't recall a delegation if it was lost */
1576                         nfs4_schedule_lease_recovery(server->nfs_client);
1577                         return -EAGAIN;
1578                 case -NFS4ERR_MOVED:
1579                         nfs4_schedule_migration_recovery(server);
1580                         return -EAGAIN;
1581                 case -NFS4ERR_LEASE_MOVED:
1582                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1583                         return -EAGAIN;
1584                 case -NFS4ERR_DELEG_REVOKED:
1585                 case -NFS4ERR_ADMIN_REVOKED:
1586                 case -NFS4ERR_BAD_STATEID:
1587                 case -NFS4ERR_OPENMODE:
1588                         nfs_inode_find_state_and_recover(state->inode,
1589                                         stateid);
1590                         nfs4_schedule_stateid_recovery(server, state);
1591                         return 0;
1592                 case -NFS4ERR_DELAY:
1593                 case -NFS4ERR_GRACE:
1594                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1595                         ssleep(1);
1596                         return -EAGAIN;
1597                 case -ENOMEM:
1598                 case -NFS4ERR_DENIED:
1599                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1600                         return 0;
1601         }
1602         return err;
1603 }
1604
1605 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1606 {
1607         struct nfs_server *server = NFS_SERVER(state->inode);
1608         struct nfs4_opendata *opendata;
1609         int err;
1610
1611         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1612                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1613         if (IS_ERR(opendata))
1614                 return PTR_ERR(opendata);
1615         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1616         err = nfs4_open_recover(opendata, state);
1617         nfs4_opendata_put(opendata);
1618         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1619 }
1620
1621 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1622 {
1623         struct nfs4_opendata *data = calldata;
1624
1625         nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
1626                                 &data->o_res.seq_res, task);
1627 }
1628
1629 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1630 {
1631         struct nfs4_opendata *data = calldata;
1632
1633         nfs40_sequence_done(task, &data->o_res.seq_res);
1634
1635         data->rpc_status = task->tk_status;
1636         if (data->rpc_status == 0) {
1637                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1638                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1639                 renew_lease(data->o_res.server, data->timestamp);
1640                 data->rpc_done = 1;
1641         }
1642 }
1643
1644 static void nfs4_open_confirm_release(void *calldata)
1645 {
1646         struct nfs4_opendata *data = calldata;
1647         struct nfs4_state *state = NULL;
1648
1649         /* If this request hasn't been cancelled, do nothing */
1650         if (data->cancelled == 0)
1651                 goto out_free;
1652         /* In case of error, no cleanup! */
1653         if (!data->rpc_done)
1654                 goto out_free;
1655         state = nfs4_opendata_to_nfs4_state(data);
1656         if (!IS_ERR(state))
1657                 nfs4_close_state(state, data->o_arg.fmode);
1658 out_free:
1659         nfs4_opendata_put(data);
1660 }
1661
1662 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1663         .rpc_call_prepare = nfs4_open_confirm_prepare,
1664         .rpc_call_done = nfs4_open_confirm_done,
1665         .rpc_release = nfs4_open_confirm_release,
1666 };
1667
1668 /*
1669  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1670  */
1671 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1672 {
1673         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1674         struct rpc_task *task;
1675         struct  rpc_message msg = {
1676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1677                 .rpc_argp = &data->c_arg,
1678                 .rpc_resp = &data->c_res,
1679                 .rpc_cred = data->owner->so_cred,
1680         };
1681         struct rpc_task_setup task_setup_data = {
1682                 .rpc_client = server->client,
1683                 .rpc_message = &msg,
1684                 .callback_ops = &nfs4_open_confirm_ops,
1685                 .callback_data = data,
1686                 .workqueue = nfsiod_workqueue,
1687                 .flags = RPC_TASK_ASYNC,
1688         };
1689         int status;
1690
1691         nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
1692         kref_get(&data->kref);
1693         data->rpc_done = 0;
1694         data->rpc_status = 0;
1695         data->timestamp = jiffies;
1696         task = rpc_run_task(&task_setup_data);
1697         if (IS_ERR(task))
1698                 return PTR_ERR(task);
1699         status = nfs4_wait_for_completion_rpc_task(task);
1700         if (status != 0) {
1701                 data->cancelled = 1;
1702                 smp_wmb();
1703         } else
1704                 status = data->rpc_status;
1705         rpc_put_task(task);
1706         return status;
1707 }
1708
1709 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1710 {
1711         struct nfs4_opendata *data = calldata;
1712         struct nfs4_state_owner *sp = data->owner;
1713         struct nfs_client *clp = sp->so_server->nfs_client;
1714
1715         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1716                 goto out_wait;
1717         /*
1718          * Check if we still need to send an OPEN call, or if we can use
1719          * a delegation instead.
1720          */
1721         if (data->state != NULL) {
1722                 struct nfs_delegation *delegation;
1723
1724                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1725                         goto out_no_action;
1726                 rcu_read_lock();
1727                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1728                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1729                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1730                     can_open_delegated(delegation, data->o_arg.fmode))
1731                         goto unlock_no_action;
1732                 rcu_read_unlock();
1733         }
1734         /* Update client id. */
1735         data->o_arg.clientid = clp->cl_clientid;
1736         switch (data->o_arg.claim) {
1737         case NFS4_OPEN_CLAIM_PREVIOUS:
1738         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1739         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1740                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1741         case NFS4_OPEN_CLAIM_FH:
1742                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1743                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1744         }
1745         data->timestamp = jiffies;
1746         if (nfs4_setup_sequence(data->o_arg.server,
1747                                 &data->o_arg.seq_args,
1748                                 &data->o_res.seq_res,
1749                                 task) != 0)
1750                 nfs_release_seqid(data->o_arg.seqid);
1751
1752         /* Set the create mode (note dependency on the session type) */
1753         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1754         if (data->o_arg.open_flags & O_EXCL) {
1755                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1756                 if (nfs4_has_persistent_session(clp))
1757                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1758                 else if (clp->cl_mvops->minor_version > 0)
1759                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1760         }
1761         return;
1762 unlock_no_action:
1763         rcu_read_unlock();
1764 out_no_action:
1765         task->tk_action = NULL;
1766 out_wait:
1767         nfs4_sequence_done(task, &data->o_res.seq_res);
1768 }
1769
1770 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1771 {
1772         struct nfs4_opendata *data = calldata;
1773
1774         data->rpc_status = task->tk_status;
1775
1776         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1777                 return;
1778
1779         if (task->tk_status == 0) {
1780                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1781                         switch (data->o_res.f_attr->mode & S_IFMT) {
1782                         case S_IFREG:
1783                                 break;
1784                         case S_IFLNK:
1785                                 data->rpc_status = -ELOOP;
1786                                 break;
1787                         case S_IFDIR:
1788                                 data->rpc_status = -EISDIR;
1789                                 break;
1790                         default:
1791                                 data->rpc_status = -ENOTDIR;
1792                         }
1793                 }
1794                 renew_lease(data->o_res.server, data->timestamp);
1795                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1796                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1797         }
1798         data->rpc_done = 1;
1799 }
1800
1801 static void nfs4_open_release(void *calldata)
1802 {
1803         struct nfs4_opendata *data = calldata;
1804         struct nfs4_state *state = NULL;
1805
1806         /* If this request hasn't been cancelled, do nothing */
1807         if (data->cancelled == 0)
1808                 goto out_free;
1809         /* In case of error, no cleanup! */
1810         if (data->rpc_status != 0 || !data->rpc_done)
1811                 goto out_free;
1812         /* In case we need an open_confirm, no cleanup! */
1813         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1814                 goto out_free;
1815         state = nfs4_opendata_to_nfs4_state(data);
1816         if (!IS_ERR(state))
1817                 nfs4_close_state(state, data->o_arg.fmode);
1818 out_free:
1819         nfs4_opendata_put(data);
1820 }
1821
1822 static const struct rpc_call_ops nfs4_open_ops = {
1823         .rpc_call_prepare = nfs4_open_prepare,
1824         .rpc_call_done = nfs4_open_done,
1825         .rpc_release = nfs4_open_release,
1826 };
1827
1828 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1829 {
1830         struct inode *dir = data->dir->d_inode;
1831         struct nfs_server *server = NFS_SERVER(dir);
1832         struct nfs_openargs *o_arg = &data->o_arg;
1833         struct nfs_openres *o_res = &data->o_res;
1834         struct rpc_task *task;
1835         struct rpc_message msg = {
1836                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1837                 .rpc_argp = o_arg,
1838                 .rpc_resp = o_res,
1839                 .rpc_cred = data->owner->so_cred,
1840         };
1841         struct rpc_task_setup task_setup_data = {
1842                 .rpc_client = server->client,
1843                 .rpc_message = &msg,
1844                 .callback_ops = &nfs4_open_ops,
1845                 .callback_data = data,
1846                 .workqueue = nfsiod_workqueue,
1847                 .flags = RPC_TASK_ASYNC,
1848         };
1849         int status;
1850
1851         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1852         kref_get(&data->kref);
1853         data->rpc_done = 0;
1854         data->rpc_status = 0;
1855         data->cancelled = 0;
1856         data->is_recover = 0;
1857         if (isrecover) {
1858                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1859                 data->is_recover = 1;
1860         }
1861         task = rpc_run_task(&task_setup_data);
1862         if (IS_ERR(task))
1863                 return PTR_ERR(task);
1864         status = nfs4_wait_for_completion_rpc_task(task);
1865         if (status != 0) {
1866                 data->cancelled = 1;
1867                 smp_wmb();
1868         } else
1869                 status = data->rpc_status;
1870         rpc_put_task(task);
1871
1872         return status;
1873 }
1874
1875 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1876 {
1877         struct inode *dir = data->dir->d_inode;
1878         struct nfs_openres *o_res = &data->o_res;
1879         int status;
1880
1881         status = nfs4_run_open_task(data, 1);
1882         if (status != 0 || !data->rpc_done)
1883                 return status;
1884
1885         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1886
1887         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1888                 status = _nfs4_proc_open_confirm(data);
1889                 if (status != 0)
1890                         return status;
1891         }
1892
1893         return status;
1894 }
1895
1896 static int nfs4_opendata_access(struct rpc_cred *cred,
1897                                 struct nfs4_opendata *opendata,
1898                                 struct nfs4_state *state, fmode_t fmode,
1899                                 int openflags)
1900 {
1901         struct nfs_access_entry cache;
1902         u32 mask;
1903
1904         /* access call failed or for some reason the server doesn't
1905          * support any access modes -- defer access call until later */
1906         if (opendata->o_res.access_supported == 0)
1907                 return 0;
1908
1909         mask = 0;
1910         /* don't check MAY_WRITE - a newly created file may not have
1911          * write mode bits, but POSIX allows the creating process to write.
1912          * use openflags to check for exec, because fmode won't
1913          * always have FMODE_EXEC set when file open for exec. */
1914         if (openflags & __FMODE_EXEC) {
1915                 /* ONLY check for exec rights */
1916                 mask = MAY_EXEC;
1917         } else if (fmode & FMODE_READ)
1918                 mask = MAY_READ;
1919
1920         cache.cred = cred;
1921         cache.jiffies = jiffies;
1922         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1923         nfs_access_add_cache(state->inode, &cache);
1924
1925         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1926                 return 0;
1927
1928         /* even though OPEN succeeded, access is denied. Close the file */
1929         nfs4_close_state(state, fmode);
1930         return -EACCES;
1931 }
1932
1933 /*
1934  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1935  */
1936 static int _nfs4_proc_open(struct nfs4_opendata *data)
1937 {
1938         struct inode *dir = data->dir->d_inode;
1939         struct nfs_server *server = NFS_SERVER(dir);
1940         struct nfs_openargs *o_arg = &data->o_arg;
1941         struct nfs_openres *o_res = &data->o_res;
1942         int status;
1943
1944         status = nfs4_run_open_task(data, 0);
1945         if (!data->rpc_done)
1946                 return status;
1947         if (status != 0) {
1948                 if (status == -NFS4ERR_BADNAME &&
1949                                 !(o_arg->open_flags & O_CREAT))
1950                         return -ENOENT;
1951                 return status;
1952         }
1953
1954         nfs_fattr_map_and_free_names(server, &data->f_attr);
1955
1956         if (o_arg->open_flags & O_CREAT) {
1957                 update_changeattr(dir, &o_res->cinfo);
1958                 if (o_arg->open_flags & O_EXCL)
1959                         data->file_created = 1;
1960                 else if (o_res->cinfo.before != o_res->cinfo.after)
1961                         data->file_created = 1;
1962         }
1963         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1964                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1965         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1966                 status = _nfs4_proc_open_confirm(data);
1967                 if (status != 0)
1968                         return status;
1969         }
1970         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1971                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1972         return 0;
1973 }
1974
1975 static int nfs4_recover_expired_lease(struct nfs_server *server)
1976 {
1977         return nfs4_client_recover_expired_lease(server->nfs_client);
1978 }
1979
1980 /*
1981  * OPEN_EXPIRED:
1982  *      reclaim state on the server after a network partition.
1983  *      Assumes caller holds the appropriate lock
1984  */
1985 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1986 {
1987         struct nfs4_opendata *opendata;
1988         int ret;
1989
1990         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1991                         NFS4_OPEN_CLAIM_FH);
1992         if (IS_ERR(opendata))
1993                 return PTR_ERR(opendata);
1994         ret = nfs4_open_recover(opendata, state);
1995         if (ret == -ESTALE)
1996                 d_drop(ctx->dentry);
1997         nfs4_opendata_put(opendata);
1998         return ret;
1999 }
2000
2001 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2002 {
2003         struct nfs_server *server = NFS_SERVER(state->inode);
2004         struct nfs4_exception exception = { };
2005         int err;
2006
2007         do {
2008                 err = _nfs4_open_expired(ctx, state);
2009                 trace_nfs4_open_expired(ctx, 0, err);
2010                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2011                         continue;
2012                 switch (err) {
2013                 default:
2014                         goto out;
2015                 case -NFS4ERR_GRACE:
2016                 case -NFS4ERR_DELAY:
2017                         nfs4_handle_exception(server, err, &exception);
2018                         err = 0;
2019                 }
2020         } while (exception.retry);
2021 out:
2022         return err;
2023 }
2024
2025 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2026 {
2027         struct nfs_open_context *ctx;
2028         int ret;
2029
2030         ctx = nfs4_state_find_open_context(state);
2031         if (IS_ERR(ctx))
2032                 return -EAGAIN;
2033         ret = nfs4_do_open_expired(ctx, state);
2034         put_nfs_open_context(ctx);
2035         return ret;
2036 }
2037
2038 #if defined(CONFIG_NFS_V4_1)
2039 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2040 {
2041         struct nfs_server *server = NFS_SERVER(state->inode);
2042         nfs4_stateid *stateid = &state->stateid;
2043         struct nfs_delegation *delegation;
2044         struct rpc_cred *cred = NULL;
2045         int status = -NFS4ERR_BAD_STATEID;
2046
2047         /* If a state reset has been done, test_stateid is unneeded */
2048         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2049                 return;
2050
2051         /* Get the delegation credential for use by test/free_stateid */
2052         rcu_read_lock();
2053         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2054         if (delegation != NULL &&
2055             nfs4_stateid_match(&delegation->stateid, stateid)) {
2056                 cred = get_rpccred(delegation->cred);
2057                 rcu_read_unlock();
2058                 status = nfs41_test_stateid(server, stateid, cred);
2059                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2060         } else
2061                 rcu_read_unlock();
2062
2063         if (status != NFS_OK) {
2064                 /* Free the stateid unless the server explicitly
2065                  * informs us the stateid is unrecognized. */
2066                 if (status != -NFS4ERR_BAD_STATEID)
2067                         nfs41_free_stateid(server, stateid, cred);
2068                 nfs_remove_bad_delegation(state->inode);
2069
2070                 write_seqlock(&state->seqlock);
2071                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2072                 write_sequnlock(&state->seqlock);
2073                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2074         }
2075
2076         if (cred != NULL)
2077                 put_rpccred(cred);
2078 }
2079
2080 /**
2081  * nfs41_check_open_stateid - possibly free an open stateid
2082  *
2083  * @state: NFSv4 state for an inode
2084  *
2085  * Returns NFS_OK if recovery for this stateid is now finished.
2086  * Otherwise a negative NFS4ERR value is returned.
2087  */
2088 static int nfs41_check_open_stateid(struct nfs4_state *state)
2089 {
2090         struct nfs_server *server = NFS_SERVER(state->inode);
2091         nfs4_stateid *stateid = &state->open_stateid;
2092         struct rpc_cred *cred = state->owner->so_cred;
2093         int status;
2094
2095         /* If a state reset has been done, test_stateid is unneeded */
2096         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2097             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2098             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2099                 return -NFS4ERR_BAD_STATEID;
2100
2101         status = nfs41_test_stateid(server, stateid, cred);
2102         trace_nfs4_test_open_stateid(state, NULL, status);
2103         if (status != NFS_OK) {
2104                 /* Free the stateid unless the server explicitly
2105                  * informs us the stateid is unrecognized. */
2106                 if (status != -NFS4ERR_BAD_STATEID)
2107                         nfs41_free_stateid(server, stateid, cred);
2108
2109                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2110                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2111                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2112                 clear_bit(NFS_OPEN_STATE, &state->flags);
2113         }
2114         return status;
2115 }
2116
2117 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2118 {
2119         int status;
2120
2121         nfs41_clear_delegation_stateid(state);
2122         status = nfs41_check_open_stateid(state);
2123         if (status != NFS_OK)
2124                 status = nfs4_open_expired(sp, state);
2125         return status;
2126 }
2127 #endif
2128
2129 /*
2130  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2131  * fields corresponding to attributes that were used to store the verifier.
2132  * Make sure we clobber those fields in the later setattr call
2133  */
2134 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2135 {
2136         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2137             !(sattr->ia_valid & ATTR_ATIME_SET))
2138                 sattr->ia_valid |= ATTR_ATIME;
2139
2140         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2141             !(sattr->ia_valid & ATTR_MTIME_SET))
2142                 sattr->ia_valid |= ATTR_MTIME;
2143 }
2144
2145 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2146                 fmode_t fmode,
2147                 int flags,
2148                 struct nfs_open_context *ctx)
2149 {
2150         struct nfs4_state_owner *sp = opendata->owner;
2151         struct nfs_server *server = sp->so_server;
2152         struct dentry *dentry;
2153         struct nfs4_state *state;
2154         unsigned int seq;
2155         int ret;
2156
2157         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2158
2159         ret = _nfs4_proc_open(opendata);
2160         if (ret != 0)
2161                 goto out;
2162
2163         state = nfs4_opendata_to_nfs4_state(opendata);
2164         ret = PTR_ERR(state);
2165         if (IS_ERR(state))
2166                 goto out;
2167         if (server->caps & NFS_CAP_POSIX_LOCK)
2168                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2169
2170         dentry = opendata->dentry;
2171         if (dentry->d_inode == NULL) {
2172                 /* FIXME: Is this d_drop() ever needed? */
2173                 d_drop(dentry);
2174                 dentry = d_add_unique(dentry, igrab(state->inode));
2175                 if (dentry == NULL) {
2176                         dentry = opendata->dentry;
2177                 } else if (dentry != ctx->dentry) {
2178                         dput(ctx->dentry);
2179                         ctx->dentry = dget(dentry);
2180                 }
2181                 nfs_set_verifier(dentry,
2182                                 nfs_save_change_attribute(opendata->dir->d_inode));
2183         }
2184
2185         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2186         if (ret != 0)
2187                 goto out;
2188
2189         ctx->state = state;
2190         if (dentry->d_inode == state->inode) {
2191                 nfs_inode_attach_open_context(ctx);
2192                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2193                         nfs4_schedule_stateid_recovery(server, state);
2194         }
2195 out:
2196         return ret;
2197 }
2198
2199 /*
2200  * Returns a referenced nfs4_state
2201  */
2202 static int _nfs4_do_open(struct inode *dir,
2203                         struct nfs_open_context *ctx,
2204                         int flags,
2205                         struct iattr *sattr,
2206                         struct nfs4_label *label,
2207                         int *opened)
2208 {
2209         struct nfs4_state_owner  *sp;
2210         struct nfs4_state     *state = NULL;
2211         struct nfs_server       *server = NFS_SERVER(dir);
2212         struct nfs4_opendata *opendata;
2213         struct dentry *dentry = ctx->dentry;
2214         struct rpc_cred *cred = ctx->cred;
2215         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2216         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2217         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2218         struct nfs4_label *olabel = NULL;
2219         int status;
2220
2221         /* Protect against reboot recovery conflicts */
2222         status = -ENOMEM;
2223         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2224         if (sp == NULL) {
2225                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2226                 goto out_err;
2227         }
2228         status = nfs4_recover_expired_lease(server);
2229         if (status != 0)
2230                 goto err_put_state_owner;
2231         if (dentry->d_inode != NULL)
2232                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2233         status = -ENOMEM;
2234         if (dentry->d_inode)
2235                 claim = NFS4_OPEN_CLAIM_FH;
2236         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2237                         label, claim, GFP_KERNEL);
2238         if (opendata == NULL)
2239                 goto err_put_state_owner;
2240
2241         if (label) {
2242                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2243                 if (IS_ERR(olabel)) {
2244                         status = PTR_ERR(olabel);
2245                         goto err_opendata_put;
2246                 }
2247         }
2248
2249         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2250                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2251                 if (!opendata->f_attr.mdsthreshold)
2252                         goto err_free_label;
2253                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2254         }
2255         if (dentry->d_inode != NULL)
2256                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2257
2258         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2259         if (status != 0)
2260                 goto err_free_label;
2261         state = ctx->state;
2262
2263         if ((opendata->o_arg.open_flags & O_EXCL) &&
2264             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2265                 nfs4_exclusive_attrset(opendata, sattr);
2266
2267                 nfs_fattr_init(opendata->o_res.f_attr);
2268                 status = nfs4_do_setattr(state->inode, cred,
2269                                 opendata->o_res.f_attr, sattr,
2270                                 state, label, olabel);
2271                 if (status == 0) {
2272                         nfs_setattr_update_inode(state->inode, sattr);
2273                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2274                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2275                 }
2276         }
2277         if (opendata->file_created)
2278                 *opened |= FILE_CREATED;
2279
2280         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2281                 *ctx_th = opendata->f_attr.mdsthreshold;
2282         else
2283                 kfree(opendata->f_attr.mdsthreshold);
2284         opendata->f_attr.mdsthreshold = NULL;
2285
2286         nfs4_label_free(olabel);
2287
2288         nfs4_opendata_put(opendata);
2289         nfs4_put_state_owner(sp);
2290         return 0;
2291 err_free_label:
2292         nfs4_label_free(olabel);
2293 err_opendata_put:
2294         kfree(opendata->f_attr.mdsthreshold);
2295         nfs4_opendata_put(opendata);
2296 err_put_state_owner:
2297         nfs4_put_state_owner(sp);
2298 out_err:
2299         return status;
2300 }
2301
2302
2303 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2304                                         struct nfs_open_context *ctx,
2305                                         int flags,
2306                                         struct iattr *sattr,
2307                                         struct nfs4_label *label,
2308                                         int *opened)
2309 {
2310         struct nfs_server *server = NFS_SERVER(dir);
2311         struct nfs4_exception exception = { };
2312         struct nfs4_state *res;
2313         int status;
2314
2315         do {
2316                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2317                 res = ctx->state;
2318                 trace_nfs4_open_file(ctx, flags, status);
2319                 if (status == 0)
2320                         break;
2321                 /* NOTE: BAD_SEQID means the server and client disagree about the
2322                  * book-keeping w.r.t. state-changing operations
2323                  * (OPEN/CLOSE/LOCK/LOCKU...)
2324                  * It is actually a sign of a bug on the client or on the server.
2325                  *
2326                  * If we receive a BAD_SEQID error in the particular case of
2327                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2328                  * have unhashed the old state_owner for us, and that we can
2329                  * therefore safely retry using a new one. We should still warn
2330                  * the user though...
2331                  */
2332                 if (status == -NFS4ERR_BAD_SEQID) {
2333                         pr_warn_ratelimited("NFS: v4 server %s "
2334                                         " returned a bad sequence-id error!\n",
2335                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2336                         exception.retry = 1;
2337                         continue;
2338                 }
2339                 /*
2340                  * BAD_STATEID on OPEN means that the server cancelled our
2341                  * state before it received the OPEN_CONFIRM.
2342                  * Recover by retrying the request as per the discussion
2343                  * on Page 181 of RFC3530.
2344                  */
2345                 if (status == -NFS4ERR_BAD_STATEID) {
2346                         exception.retry = 1;
2347                         continue;
2348                 }
2349                 if (status == -EAGAIN) {
2350                         /* We must have found a delegation */
2351                         exception.retry = 1;
2352                         continue;
2353                 }
2354                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2355                         continue;
2356                 res = ERR_PTR(nfs4_handle_exception(server,
2357                                         status, &exception));
2358         } while (exception.retry);
2359         return res;
2360 }
2361
2362 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2363                             struct nfs_fattr *fattr, struct iattr *sattr,
2364                             struct nfs4_state *state, struct nfs4_label *ilabel,
2365                             struct nfs4_label *olabel)
2366 {
2367         struct nfs_server *server = NFS_SERVER(inode);
2368         struct nfs_setattrargs  arg = {
2369                 .fh             = NFS_FH(inode),
2370                 .iap            = sattr,
2371                 .server         = server,
2372                 .bitmask = server->attr_bitmask,
2373                 .label          = ilabel,
2374         };
2375         struct nfs_setattrres  res = {
2376                 .fattr          = fattr,
2377                 .label          = olabel,
2378                 .server         = server,
2379         };
2380         struct rpc_message msg = {
2381                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2382                 .rpc_argp       = &arg,
2383                 .rpc_resp       = &res,
2384                 .rpc_cred       = cred,
2385         };
2386         unsigned long timestamp = jiffies;
2387         fmode_t fmode;
2388         bool truncate;
2389         int status;
2390
2391         arg.bitmask = nfs4_bitmask(server, ilabel);
2392         if (ilabel)
2393                 arg.bitmask = nfs4_bitmask(server, olabel);
2394
2395         nfs_fattr_init(fattr);
2396
2397         /* Servers should only apply open mode checks for file size changes */
2398         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2399         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2400
2401         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2402                 /* Use that stateid */
2403         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2404                 struct nfs_lockowner lockowner = {
2405                         .l_owner = current->files,
2406                         .l_pid = current->tgid,
2407                 };
2408                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2409                                 &lockowner);
2410         } else
2411                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2412
2413         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2414         if (status == 0 && state != NULL)
2415                 renew_lease(server, timestamp);
2416         return status;
2417 }
2418
2419 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2420                            struct nfs_fattr *fattr, struct iattr *sattr,
2421                            struct nfs4_state *state, struct nfs4_label *ilabel,
2422                            struct nfs4_label *olabel)
2423 {
2424         struct nfs_server *server = NFS_SERVER(inode);
2425         struct nfs4_exception exception = {
2426                 .state = state,
2427                 .inode = inode,
2428         };
2429         int err;
2430         do {
2431                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2432                 trace_nfs4_setattr(inode, err);
2433                 switch (err) {
2434                 case -NFS4ERR_OPENMODE:
2435                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2436                                 pr_warn_once("NFSv4: server %s is incorrectly "
2437                                                 "applying open mode checks to "
2438                                                 "a SETATTR that is not "
2439                                                 "changing file size.\n",
2440                                                 server->nfs_client->cl_hostname);
2441                         }
2442                         if (state && !(state->state & FMODE_WRITE)) {
2443                                 err = -EBADF;
2444                                 if (sattr->ia_valid & ATTR_OPEN)
2445                                         err = -EACCES;
2446                                 goto out;
2447                         }
2448                 }
2449                 err = nfs4_handle_exception(server, err, &exception);
2450         } while (exception.retry);
2451 out:
2452         return err;
2453 }
2454
2455 struct nfs4_closedata {
2456         struct inode *inode;
2457         struct nfs4_state *state;
2458         struct nfs_closeargs arg;
2459         struct nfs_closeres res;
2460         struct nfs_fattr fattr;
2461         unsigned long timestamp;
2462         bool roc;
2463         u32 roc_barrier;
2464 };
2465
2466 static void nfs4_free_closedata(void *data)
2467 {
2468         struct nfs4_closedata *calldata = data;
2469         struct nfs4_state_owner *sp = calldata->state->owner;
2470         struct super_block *sb = calldata->state->inode->i_sb;
2471
2472         if (calldata->roc)
2473                 pnfs_roc_release(calldata->state->inode);
2474         nfs4_put_open_state(calldata->state);
2475         nfs_free_seqid(calldata->arg.seqid);
2476         nfs4_put_state_owner(sp);
2477         nfs_sb_deactive(sb);
2478         kfree(calldata);
2479 }
2480
2481 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2482                 fmode_t fmode)
2483 {
2484         spin_lock(&state->owner->so_lock);
2485         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2486         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2487         case FMODE_WRITE:
2488                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2489                 break;
2490         case FMODE_READ:
2491                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2492                 break;
2493         case 0:
2494                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2495                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2496                 clear_bit(NFS_OPEN_STATE, &state->flags);
2497         }
2498         spin_unlock(&state->owner->so_lock);
2499 }
2500
2501 static void nfs4_close_done(struct rpc_task *task, void *data)
2502 {
2503         struct nfs4_closedata *calldata = data;
2504         struct nfs4_state *state = calldata->state;
2505         struct nfs_server *server = NFS_SERVER(calldata->inode);
2506
2507         dprintk("%s: begin!\n", __func__);
2508         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2509                 return;
2510         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2511         /* hmm. we are done with the inode, and in the process of freeing
2512          * the state_owner. we keep this around to process errors
2513          */
2514         switch (task->tk_status) {
2515                 case 0:
2516                         if (calldata->roc)
2517                                 pnfs_roc_set_barrier(state->inode,
2518                                                      calldata->roc_barrier);
2519                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2520                         renew_lease(server, calldata->timestamp);
2521                         nfs4_close_clear_stateid_flags(state,
2522                                         calldata->arg.fmode);
2523                         break;
2524                 case -NFS4ERR_STALE_STATEID:
2525                 case -NFS4ERR_OLD_STATEID:
2526                 case -NFS4ERR_BAD_STATEID:
2527                 case -NFS4ERR_EXPIRED:
2528                         if (calldata->arg.fmode == 0)
2529                                 break;
2530                 default:
2531                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2532                                 rpc_restart_call_prepare(task);
2533         }
2534         nfs_release_seqid(calldata->arg.seqid);
2535         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2536         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2537 }
2538
2539 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2540 {
2541         struct nfs4_closedata *calldata = data;
2542         struct nfs4_state *state = calldata->state;
2543         struct inode *inode = calldata->inode;
2544         int call_close = 0;
2545
2546         dprintk("%s: begin!\n", __func__);
2547         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2548                 goto out_wait;
2549
2550         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2551         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2552         spin_lock(&state->owner->so_lock);
2553         /* Calculate the change in open mode */
2554         if (state->n_rdwr == 0) {
2555                 if (state->n_rdonly == 0) {
2556                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2557                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2558                         calldata->arg.fmode &= ~FMODE_READ;
2559                 }
2560                 if (state->n_wronly == 0) {
2561                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2562                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2563                         calldata->arg.fmode &= ~FMODE_WRITE;
2564                 }
2565         }
2566         if (!nfs4_valid_open_stateid(state))
2567                 call_close = 0;
2568         spin_unlock(&state->owner->so_lock);
2569
2570         if (!call_close) {
2571                 /* Note: exit _without_ calling nfs4_close_done */
2572                 goto out_no_action;
2573         }
2574
2575         if (calldata->arg.fmode == 0) {
2576                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2577                 if (calldata->roc &&
2578                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2579                         nfs_release_seqid(calldata->arg.seqid);
2580                         goto out_wait;
2581                     }
2582         }
2583
2584         nfs_fattr_init(calldata->res.fattr);
2585         calldata->timestamp = jiffies;
2586         if (nfs4_setup_sequence(NFS_SERVER(inode),
2587                                 &calldata->arg.seq_args,
2588                                 &calldata->res.seq_res,
2589                                 task) != 0)
2590                 nfs_release_seqid(calldata->arg.seqid);
2591         dprintk("%s: done!\n", __func__);
2592         return;
2593 out_no_action:
2594         task->tk_action = NULL;
2595 out_wait:
2596         nfs4_sequence_done(task, &calldata->res.seq_res);
2597 }
2598
2599 static const struct rpc_call_ops nfs4_close_ops = {
2600         .rpc_call_prepare = nfs4_close_prepare,
2601         .rpc_call_done = nfs4_close_done,
2602         .rpc_release = nfs4_free_closedata,
2603 };
2604
2605 /*
2606  * It is possible for data to be read/written from a mem-mapped file
2607  * after the sys_close call (which hits the vfs layer as a flush).
2608  * This means that we can't safely call nfsv4 close on a file until
2609  * the inode is cleared. This in turn means that we are not good
2610  * NFSv4 citizens - we do not indicate to the server to update the file's
2611  * share state even when we are done with one of the three share
2612  * stateid's in the inode.
2613  *
2614  * NOTE: Caller must be holding the sp->so_owner semaphore!
2615  */
2616 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2617 {
2618         struct nfs_server *server = NFS_SERVER(state->inode);
2619         struct nfs4_closedata *calldata;
2620         struct nfs4_state_owner *sp = state->owner;
2621         struct rpc_task *task;
2622         struct rpc_message msg = {
2623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2624                 .rpc_cred = state->owner->so_cred,
2625         };
2626         struct rpc_task_setup task_setup_data = {
2627                 .rpc_client = server->client,
2628                 .rpc_message = &msg,
2629                 .callback_ops = &nfs4_close_ops,
2630                 .workqueue = nfsiod_workqueue,
2631                 .flags = RPC_TASK_ASYNC,
2632         };
2633         int status = -ENOMEM;
2634
2635         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2636                 &task_setup_data.rpc_client, &msg);
2637
2638         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2639         if (calldata == NULL)
2640                 goto out;
2641         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2642         calldata->inode = state->inode;
2643         calldata->state = state;
2644         calldata->arg.fh = NFS_FH(state->inode);
2645         calldata->arg.stateid = &state->open_stateid;
2646         /* Serialization for the sequence id */
2647         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2648         if (calldata->arg.seqid == NULL)
2649                 goto out_free_calldata;
2650         calldata->arg.fmode = 0;
2651         calldata->arg.bitmask = server->cache_consistency_bitmask;
2652         calldata->res.fattr = &calldata->fattr;
2653         calldata->res.seqid = calldata->arg.seqid;
2654         calldata->res.server = server;
2655         calldata->roc = pnfs_roc(state->inode);
2656         nfs_sb_active(calldata->inode->i_sb);
2657
2658         msg.rpc_argp = &calldata->arg;
2659         msg.rpc_resp = &calldata->res;
2660         task_setup_data.callback_data = calldata;
2661         task = rpc_run_task(&task_setup_data);
2662         if (IS_ERR(task))
2663                 return PTR_ERR(task);
2664         status = 0;
2665         if (wait)
2666                 status = rpc_wait_for_completion_task(task);
2667         rpc_put_task(task);
2668         return status;
2669 out_free_calldata:
2670         kfree(calldata);
2671 out:
2672         nfs4_put_open_state(state);
2673         nfs4_put_state_owner(sp);
2674         return status;
2675 }
2676
2677 static struct inode *
2678 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2679                 int open_flags, struct iattr *attr, int *opened)
2680 {
2681         struct nfs4_state *state;
2682         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2683
2684         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2685
2686         /* Protect against concurrent sillydeletes */
2687         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2688
2689         nfs4_label_release_security(label);
2690
2691         if (IS_ERR(state))
2692                 return ERR_CAST(state);
2693         return state->inode;
2694 }
2695
2696 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2697 {
2698         if (ctx->state == NULL)
2699                 return;
2700         if (is_sync)
2701                 nfs4_close_sync(ctx->state, ctx->mode);
2702         else
2703                 nfs4_close_state(ctx->state, ctx->mode);
2704 }
2705
2706 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2707 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2708 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_CHANGE_SECURITY_LABEL - 1UL)
2709
2710 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2711 {
2712         struct nfs4_server_caps_arg args = {
2713                 .fhandle = fhandle,
2714         };
2715         struct nfs4_server_caps_res res = {};
2716         struct rpc_message msg = {
2717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2718                 .rpc_argp = &args,
2719                 .rpc_resp = &res,
2720         };
2721         int status;
2722
2723         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2724         if (status == 0) {
2725                 /* Sanity check the server answers */
2726                 switch (server->nfs_client->cl_minorversion) {
2727                 case 0:
2728                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2729                         res.attr_bitmask[2] = 0;
2730                         break;
2731                 case 1:
2732                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2733                         break;
2734                 case 2:
2735                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2736                 }
2737                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2738                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2739                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2740                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2741                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2742                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2743                                 NFS_CAP_SECURITY_LABEL);
2744                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2745                         server->caps |= NFS_CAP_ACLS;
2746                 if (res.has_links != 0)
2747                         server->caps |= NFS_CAP_HARDLINKS;
2748                 if (res.has_symlinks != 0)
2749                         server->caps |= NFS_CAP_SYMLINKS;
2750                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2751                         server->caps |= NFS_CAP_FILEID;
2752                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2753                         server->caps |= NFS_CAP_MODE;
2754                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2755                         server->caps |= NFS_CAP_NLINK;
2756                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2757                         server->caps |= NFS_CAP_OWNER;
2758                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2759                         server->caps |= NFS_CAP_OWNER_GROUP;
2760                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2761                         server->caps |= NFS_CAP_ATIME;
2762                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2763                         server->caps |= NFS_CAP_CTIME;
2764                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2765                         server->caps |= NFS_CAP_MTIME;
2766 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2767                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2768                         server->caps |= NFS_CAP_SECURITY_LABEL;
2769 #endif
2770                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2771                                 sizeof(server->attr_bitmask));
2772                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2773
2774                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2775                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2776                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2777                 server->cache_consistency_bitmask[2] = 0;
2778                 server->acl_bitmask = res.acl_bitmask;
2779                 server->fh_expire_type = res.fh_expire_type;
2780         }
2781
2782         return status;
2783 }
2784
2785 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2786 {
2787         struct nfs4_exception exception = { };
2788         int err;
2789         do {
2790                 err = nfs4_handle_exception(server,
2791                                 _nfs4_server_capabilities(server, fhandle),
2792                                 &exception);
2793         } while (exception.retry);
2794         return err;
2795 }
2796
2797 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2798                 struct nfs_fsinfo *info)
2799 {
2800         u32 bitmask[3];
2801         struct nfs4_lookup_root_arg args = {
2802                 .bitmask = bitmask,
2803         };
2804         struct nfs4_lookup_res res = {
2805                 .server = server,
2806                 .fattr = info->fattr,
2807                 .fh = fhandle,
2808         };
2809         struct rpc_message msg = {
2810                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2811                 .rpc_argp = &args,
2812                 .rpc_resp = &res,
2813         };
2814
2815         bitmask[0] = nfs4_fattr_bitmap[0];
2816         bitmask[1] = nfs4_fattr_bitmap[1];
2817         /*
2818          * Process the label in the upcoming getfattr
2819          */
2820         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2821
2822         nfs_fattr_init(info->fattr);
2823         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2824 }
2825
2826 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2827                 struct nfs_fsinfo *info)
2828 {
2829         struct nfs4_exception exception = { };
2830         int err;
2831         do {
2832                 err = _nfs4_lookup_root(server, fhandle, info);
2833                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2834                 switch (err) {
2835                 case 0:
2836                 case -NFS4ERR_WRONGSEC:
2837                         goto out;
2838                 default:
2839                         err = nfs4_handle_exception(server, err, &exception);
2840                 }
2841         } while (exception.retry);
2842 out:
2843         return err;
2844 }
2845
2846 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2847                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2848 {
2849         struct rpc_auth_create_args auth_args = {
2850                 .pseudoflavor = flavor,
2851         };
2852         struct rpc_auth *auth;
2853         int ret;
2854
2855         auth = rpcauth_create(&auth_args, server->client);
2856         if (IS_ERR(auth)) {
2857                 ret = -EACCES;
2858                 goto out;
2859         }
2860         ret = nfs4_lookup_root(server, fhandle, info);
2861 out:
2862         return ret;
2863 }
2864
2865 /*
2866  * Retry pseudoroot lookup with various security flavors.  We do this when:
2867  *
2868  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2869  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2870  *
2871  * Returns zero on success, or a negative NFS4ERR value, or a
2872  * negative errno value.
2873  */
2874 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2875                               struct nfs_fsinfo *info)
2876 {
2877         /* Per 3530bis 15.33.5 */
2878         static const rpc_authflavor_t flav_array[] = {
2879                 RPC_AUTH_GSS_KRB5P,
2880                 RPC_AUTH_GSS_KRB5I,
2881                 RPC_AUTH_GSS_KRB5,
2882                 RPC_AUTH_UNIX,                  /* courtesy */
2883                 RPC_AUTH_NULL,
2884         };
2885         int status = -EPERM;
2886         size_t i;
2887
2888         if (server->auth_info.flavor_len > 0) {
2889                 /* try each flavor specified by user */
2890                 for (i = 0; i < server->auth_info.flavor_len; i++) {
2891                         status = nfs4_lookup_root_sec(server, fhandle, info,
2892                                                 server->auth_info.flavors[i]);
2893                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2894                                 continue;
2895                         break;
2896                 }
2897         } else {
2898                 /* no flavors specified by user, try default list */
2899                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2900                         status = nfs4_lookup_root_sec(server, fhandle, info,
2901                                                       flav_array[i]);
2902                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2903                                 continue;
2904                         break;
2905                 }
2906         }
2907
2908         /*
2909          * -EACCESS could mean that the user doesn't have correct permissions
2910          * to access the mount.  It could also mean that we tried to mount
2911          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2912          * existing mount programs don't handle -EACCES very well so it should
2913          * be mapped to -EPERM instead.
2914          */
2915         if (status == -EACCES)
2916                 status = -EPERM;
2917         return status;
2918 }
2919
2920 static int nfs4_do_find_root_sec(struct nfs_server *server,
2921                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2922 {
2923         int mv = server->nfs_client->cl_minorversion;
2924         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2925 }
2926
2927 /**
2928  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2929  * @server: initialized nfs_server handle
2930  * @fhandle: we fill in the pseudo-fs root file handle
2931  * @info: we fill in an FSINFO struct
2932  * @auth_probe: probe the auth flavours
2933  *
2934  * Returns zero on success, or a negative errno.
2935  */
2936 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2937                          struct nfs_fsinfo *info,
2938                          bool auth_probe)
2939 {
2940         int status;
2941
2942         switch (auth_probe) {
2943         case false:
2944                 status = nfs4_lookup_root(server, fhandle, info);
2945                 if (status != -NFS4ERR_WRONGSEC)
2946                         break;
2947         default:
2948                 status = nfs4_do_find_root_sec(server, fhandle, info);
2949         }
2950
2951         if (status == 0)
2952                 status = nfs4_server_capabilities(server, fhandle);
2953         if (status == 0)
2954                 status = nfs4_do_fsinfo(server, fhandle, info);
2955
2956         return nfs4_map_errors(status);
2957 }
2958
2959 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2960                               struct nfs_fsinfo *info)
2961 {
2962         int error;
2963         struct nfs_fattr *fattr = info->fattr;
2964         struct nfs4_label *label = NULL;
2965
2966         error = nfs4_server_capabilities(server, mntfh);
2967         if (error < 0) {
2968                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2969                 return error;
2970         }
2971
2972         label = nfs4_label_alloc(server, GFP_KERNEL);
2973         if (IS_ERR(label))
2974                 return PTR_ERR(label);
2975
2976         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2977         if (error < 0) {
2978                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2979                 goto err_free_label;
2980         }
2981
2982         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2983             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2984                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2985
2986 err_free_label:
2987         nfs4_label_free(label);
2988
2989         return error;
2990 }
2991
2992 /*
2993  * Get locations and (maybe) other attributes of a referral.
2994  * Note that we'll actually follow the referral later when
2995  * we detect fsid mismatch in inode revalidation
2996  */
2997 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2998                              const struct qstr *name, struct nfs_fattr *fattr,
2999                              struct nfs_fh *fhandle)
3000 {
3001         int status = -ENOMEM;
3002         struct page *page = NULL;
3003         struct nfs4_fs_locations *locations = NULL;
3004
3005         page = alloc_page(GFP_KERNEL);
3006         if (page == NULL)
3007                 goto out;
3008         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3009         if (locations == NULL)
3010                 goto out;
3011
3012         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3013         if (status != 0)
3014                 goto out;
3015
3016         /*
3017          * If the fsid didn't change, this is a migration event, not a
3018          * referral.  Cause us to drop into the exception handler, which
3019          * will kick off migration recovery.
3020          */
3021         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3022                 dprintk("%s: server did not return a different fsid for"
3023                         " a referral at %s\n", __func__, name->name);
3024                 status = -NFS4ERR_MOVED;
3025                 goto out;
3026         }
3027         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3028         nfs_fixup_referral_attributes(&locations->fattr);
3029
3030         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3031         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3032         memset(fhandle, 0, sizeof(struct nfs_fh));
3033 out:
3034         if (page)
3035                 __free_page(page);
3036         kfree(locations);
3037         return status;
3038 }
3039
3040 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3041                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3042 {
3043         struct nfs4_getattr_arg args = {
3044                 .fh = fhandle,
3045                 .bitmask = server->attr_bitmask,
3046         };
3047         struct nfs4_getattr_res res = {
3048                 .fattr = fattr,
3049                 .label = label,
3050                 .server = server,
3051         };
3052         struct rpc_message msg = {
3053                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3054                 .rpc_argp = &args,
3055                 .rpc_resp = &res,
3056         };
3057
3058         args.bitmask = nfs4_bitmask(server, label);
3059
3060         nfs_fattr_init(fattr);
3061         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3062 }
3063
3064 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3065                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3066 {
3067         struct nfs4_exception exception = { };
3068         int err;
3069         do {
3070                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3071                 trace_nfs4_getattr(server, fhandle, fattr, err);
3072                 err = nfs4_handle_exception(server, err,
3073                                 &exception);
3074         } while (exception.retry);
3075         return err;
3076 }
3077
3078 /*
3079  * The file is not closed if it is opened due to the a request to change
3080  * the size of the file. The open call will not be needed once the
3081  * VFS layer lookup-intents are implemented.
3082  *
3083  * Close is called when the inode is destroyed.
3084  * If we haven't opened the file for O_WRONLY, we
3085  * need to in the size_change case to obtain a stateid.
3086  *
3087  * Got race?
3088  * Because OPEN is always done by name in nfsv4, it is
3089  * possible that we opened a different file by the same
3090  * name.  We can recognize this race condition, but we
3091  * can't do anything about it besides returning an error.
3092  *
3093  * This will be fixed with VFS changes (lookup-intent).
3094  */
3095 static int
3096 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3097                   struct iattr *sattr)
3098 {
3099         struct inode *inode = dentry->d_inode;
3100         struct rpc_cred *cred = NULL;
3101         struct nfs4_state *state = NULL;
3102         struct nfs4_label *label = NULL;
3103         int status;
3104
3105         if (pnfs_ld_layoutret_on_setattr(inode))
3106                 pnfs_commit_and_return_layout(inode);
3107
3108         nfs_fattr_init(fattr);
3109
3110         /* Deal with open(O_TRUNC) */
3111         if (sattr->ia_valid & ATTR_OPEN)
3112                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3113
3114         /* Optimization: if the end result is no change, don't RPC */
3115         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3116                 return 0;
3117
3118         /* Search for an existing open(O_WRITE) file */
3119         if (sattr->ia_valid & ATTR_FILE) {
3120                 struct nfs_open_context *ctx;
3121
3122                 ctx = nfs_file_open_context(sattr->ia_file);
3123                 if (ctx) {
3124                         cred = ctx->cred;
3125                         state = ctx->state;
3126                 }
3127         }
3128
3129         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3130         if (IS_ERR(label))
3131                 return PTR_ERR(label);
3132
3133         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3134         if (status == 0) {
3135                 nfs_setattr_update_inode(inode, sattr);
3136                 nfs_setsecurity(inode, fattr, label);
3137         }
3138         nfs4_label_free(label);
3139         return status;
3140 }
3141
3142 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3143                 const struct qstr *name, struct nfs_fh *fhandle,
3144                 struct nfs_fattr *fattr, struct nfs4_label *label)
3145 {
3146         struct nfs_server *server = NFS_SERVER(dir);
3147         int                    status;
3148         struct nfs4_lookup_arg args = {
3149                 .bitmask = server->attr_bitmask,
3150                 .dir_fh = NFS_FH(dir),
3151                 .name = name,
3152         };
3153         struct nfs4_lookup_res res = {
3154                 .server = server,
3155                 .fattr = fattr,
3156                 .label = label,
3157                 .fh = fhandle,
3158         };
3159         struct rpc_message msg = {
3160                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3161                 .rpc_argp = &args,
3162                 .rpc_resp = &res,
3163         };
3164
3165         args.bitmask = nfs4_bitmask(server, label);
3166
3167         nfs_fattr_init(fattr);
3168
3169         dprintk("NFS call  lookup %s\n", name->name);
3170         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3171         dprintk("NFS reply lookup: %d\n", status);
3172         return status;
3173 }
3174
3175 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3176 {
3177         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3178                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3179         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3180         fattr->nlink = 2;
3181 }
3182
3183 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3184                                    struct qstr *name, struct nfs_fh *fhandle,
3185                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3186 {
3187         struct nfs4_exception exception = { };
3188         struct rpc_clnt *client = *clnt;
3189         int err;
3190         do {
3191                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3192                 trace_nfs4_lookup(dir, name, err);
3193                 switch (err) {
3194                 case -NFS4ERR_BADNAME:
3195                         err = -ENOENT;
3196                         goto out;
3197                 case -NFS4ERR_MOVED:
3198                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3199                         goto out;
3200                 case -NFS4ERR_WRONGSEC:
3201                         err = -EPERM;
3202                         if (client != *clnt)
3203                                 goto out;
3204                         client = nfs4_create_sec_client(client, dir, name);
3205                         if (IS_ERR(client))
3206                                 return PTR_ERR(client);
3207
3208                         exception.retry = 1;
3209                         break;
3210                 default:
3211                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3212                 }
3213         } while (exception.retry);
3214
3215 out:
3216         if (err == 0)
3217                 *clnt = client;
3218         else if (client != *clnt)
3219                 rpc_shutdown_client(client);
3220
3221         return err;
3222 }
3223
3224 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3225                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3226                             struct nfs4_label *label)
3227 {
3228         int status;
3229         struct rpc_clnt *client = NFS_CLIENT(dir);
3230
3231         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3232         if (client != NFS_CLIENT(dir)) {
3233                 rpc_shutdown_client(client);
3234                 nfs_fixup_secinfo_attributes(fattr);
3235         }
3236         return status;
3237 }
3238
3239 struct rpc_clnt *
3240 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3241                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3242 {
3243         struct rpc_clnt *client = NFS_CLIENT(dir);
3244         int status;
3245
3246         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3247         if (status < 0)
3248                 return ERR_PTR(status);
3249         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3250 }
3251
3252 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3253 {
3254         struct nfs_server *server = NFS_SERVER(inode);
3255         struct nfs4_accessargs args = {
3256                 .fh = NFS_FH(inode),
3257                 .bitmask = server->cache_consistency_bitmask,
3258         };
3259         struct nfs4_accessres res = {
3260                 .server = server,
3261         };
3262         struct rpc_message msg = {
3263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3264                 .rpc_argp = &args,
3265                 .rpc_resp = &res,
3266                 .rpc_cred = entry->cred,
3267         };
3268         int mode = entry->mask;
3269         int status = 0;
3270
3271         /*
3272          * Determine which access bits we want to ask for...
3273          */
3274         if (mode & MAY_READ)
3275                 args.access |= NFS4_ACCESS_READ;
3276         if (S_ISDIR(inode->i_mode)) {
3277                 if (mode & MAY_WRITE)
3278                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3279                 if (mode & MAY_EXEC)
3280                         args.access |= NFS4_ACCESS_LOOKUP;
3281         } else {
3282                 if (mode & MAY_WRITE)
3283                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3284                 if (mode & MAY_EXEC)
3285                         args.access |= NFS4_ACCESS_EXECUTE;
3286         }
3287
3288         res.fattr = nfs_alloc_fattr();
3289         if (res.fattr == NULL)
3290                 return -ENOMEM;
3291
3292         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3293         if (!status) {
3294                 nfs_access_set_mask(entry, res.access);
3295                 nfs_refresh_inode(inode, res.fattr);
3296         }
3297         nfs_free_fattr(res.fattr);
3298         return status;
3299 }
3300
3301 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3302 {
3303         struct nfs4_exception exception = { };
3304         int err;
3305         do {
3306                 err = _nfs4_proc_access(inode, entry);
3307                 trace_nfs4_access(inode, err);
3308                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3309                                 &exception);
3310         } while (exception.retry);
3311         return err;
3312 }
3313
3314 /*
3315  * TODO: For the time being, we don't try to get any attributes
3316  * along with any of the zero-copy operations READ, READDIR,
3317  * READLINK, WRITE.
3318  *
3319  * In the case of the first three, we want to put the GETATTR
3320  * after the read-type operation -- this is because it is hard
3321  * to predict the length of a GETATTR response in v4, and thus
3322  * align the READ data correctly.  This means that the GETATTR
3323  * may end up partially falling into the page cache, and we should
3324  * shift it into the 'tail' of the xdr_buf before processing.
3325  * To do this efficiently, we need to know the total length
3326  * of data received, which doesn't seem to be available outside
3327  * of the RPC layer.
3328  *
3329  * In the case of WRITE, we also want to put the GETATTR after
3330  * the operation -- in this case because we want to make sure
3331  * we get the post-operation mtime and size.
3332  *
3333  * Both of these changes to the XDR layer would in fact be quite
3334  * minor, but I decided to leave them for a subsequent patch.
3335  */
3336 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3337                 unsigned int pgbase, unsigned int pglen)
3338 {
3339         struct nfs4_readlink args = {
3340                 .fh       = NFS_FH(inode),
3341                 .pgbase   = pgbase,
3342                 .pglen    = pglen,
3343                 .pages    = &page,
3344         };
3345         struct nfs4_readlink_res res;
3346         struct rpc_message msg = {
3347                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3348                 .rpc_argp = &args,
3349                 .rpc_resp = &res,
3350         };
3351
3352         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3353 }
3354
3355 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3356                 unsigned int pgbase, unsigned int pglen)
3357 {
3358         struct nfs4_exception exception = { };
3359         int err;
3360         do {
3361                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3362                 trace_nfs4_readlink(inode, err);
3363                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3364                                 &exception);
3365         } while (exception.retry);
3366         return err;
3367 }
3368
3369 /*
3370  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3371  */
3372 static int
3373 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3374                  int flags)
3375 {
3376         struct nfs4_label l, *ilabel = NULL;
3377         struct nfs_open_context *ctx;
3378         struct nfs4_state *state;
3379         int opened = 0;
3380         int status = 0;
3381
3382         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3383         if (IS_ERR(ctx))
3384                 return PTR_ERR(ctx);
3385
3386         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3387
3388         sattr->ia_mode &= ~current_umask();
3389         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3390         if (IS_ERR(state)) {
3391                 status = PTR_ERR(state);
3392                 goto out;
3393         }
3394 out:
3395         nfs4_label_release_security(ilabel);
3396         put_nfs_open_context(ctx);
3397         return status;
3398 }
3399
3400 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3401 {
3402         struct nfs_server *server = NFS_SERVER(dir);
3403         struct nfs_removeargs args = {
3404                 .fh = NFS_FH(dir),
3405                 .name = *name,
3406         };
3407         struct nfs_removeres res = {
3408                 .server = server,
3409         };
3410         struct rpc_message msg = {
3411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3412                 .rpc_argp = &args,
3413                 .rpc_resp = &res,
3414         };
3415         int status;
3416
3417         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3418         if (status == 0)
3419                 update_changeattr(dir, &res.cinfo);
3420         return status;
3421 }
3422
3423 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3424 {
3425         struct nfs4_exception exception = { };
3426         int err;
3427         do {
3428                 err = _nfs4_proc_remove(dir, name);
3429                 trace_nfs4_remove(dir, name, err);
3430                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3431                                 &exception);
3432         } while (exception.retry);
3433         return err;
3434 }
3435
3436 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3437 {
3438         struct nfs_server *server = NFS_SERVER(dir);
3439         struct nfs_removeargs *args = msg->rpc_argp;
3440         struct nfs_removeres *res = msg->rpc_resp;
3441
3442         res->server = server;
3443         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3444         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3445
3446         nfs_fattr_init(res->dir_attr);
3447 }
3448
3449 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3450 {
3451         nfs4_setup_sequence(NFS_SERVER(data->dir),
3452                         &data->args.seq_args,
3453                         &data->res.seq_res,
3454                         task);
3455 }
3456
3457 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3458 {
3459         struct nfs_unlinkdata *data = task->tk_calldata;
3460         struct nfs_removeres *res = &data->res;
3461
3462         if (!nfs4_sequence_done(task, &res->seq_res))
3463                 return 0;
3464         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3465                 return 0;
3466         update_changeattr(dir, &res->cinfo);
3467         return 1;
3468 }
3469
3470 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3471 {
3472         struct nfs_server *server = NFS_SERVER(dir);
3473         struct nfs_renameargs *arg = msg->rpc_argp;
3474         struct nfs_renameres *res = msg->rpc_resp;
3475
3476         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3477         res->server = server;
3478         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3479 }
3480
3481 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3482 {
3483         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3484                         &data->args.seq_args,
3485                         &data->res.seq_res,
3486                         task);
3487 }
3488
3489 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3490                                  struct inode *new_dir)
3491 {
3492         struct nfs_renamedata *data = task->tk_calldata;
3493         struct nfs_renameres *res = &data->res;
3494
3495         if (!nfs4_sequence_done(task, &res->seq_res))
3496                 return 0;
3497         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3498                 return 0;
3499
3500         update_changeattr(old_dir, &res->old_cinfo);
3501         update_changeattr(new_dir, &res->new_cinfo);
3502         return 1;
3503 }
3504
3505 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3506                 struct inode *new_dir, struct qstr *new_name)
3507 {
3508         struct nfs_server *server = NFS_SERVER(old_dir);
3509         struct nfs_renameargs arg = {
3510                 .old_dir = NFS_FH(old_dir),
3511                 .new_dir = NFS_FH(new_dir),
3512                 .old_name = old_name,
3513                 .new_name = new_name,
3514         };
3515         struct nfs_renameres res = {
3516                 .server = server,
3517         };
3518         struct rpc_message msg = {
3519                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3520                 .rpc_argp = &arg,
3521                 .rpc_resp = &res,
3522         };
3523         int status = -ENOMEM;
3524
3525         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3526         if (!status) {
3527                 update_changeattr(old_dir, &res.old_cinfo);
3528                 update_changeattr(new_dir, &res.new_cinfo);
3529         }
3530         return status;
3531 }
3532
3533 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3534                 struct inode *new_dir, struct qstr *new_name)
3535 {
3536         struct nfs4_exception exception = { };
3537         int err;
3538         do {
3539                 err = _nfs4_proc_rename(old_dir, old_name,
3540                                         new_dir, new_name);
3541                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3542                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3543                                 &exception);
3544         } while (exception.retry);
3545         return err;
3546 }
3547
3548 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3549 {
3550         struct nfs_server *server = NFS_SERVER(inode);
3551         struct nfs4_link_arg arg = {
3552                 .fh     = NFS_FH(inode),
3553                 .dir_fh = NFS_FH(dir),
3554                 .name   = name,
3555                 .bitmask = server->attr_bitmask,
3556         };
3557         struct nfs4_link_res res = {
3558                 .server = server,
3559                 .label = NULL,
3560         };
3561         struct rpc_message msg = {
3562                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3563                 .rpc_argp = &arg,
3564                 .rpc_resp = &res,
3565         };
3566         int status = -ENOMEM;
3567
3568         res.fattr = nfs_alloc_fattr();
3569         if (res.fattr == NULL)
3570                 goto out;
3571
3572         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3573         if (IS_ERR(res.label)) {
3574                 status = PTR_ERR(res.label);
3575                 goto out;
3576         }
3577         arg.bitmask = nfs4_bitmask(server, res.label);
3578
3579         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3580         if (!status) {
3581                 update_changeattr(dir, &res.cinfo);
3582                 status = nfs_post_op_update_inode(inode, res.fattr);
3583                 if (!status)
3584                         nfs_setsecurity(inode, res.fattr, res.label);
3585         }
3586
3587
3588         nfs4_label_free(res.label);
3589
3590 out:
3591         nfs_free_fattr(res.fattr);
3592         return status;
3593 }
3594
3595 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3596 {
3597         struct nfs4_exception exception = { };
3598         int err;
3599         do {
3600                 err = nfs4_handle_exception(NFS_SERVER(inode),
3601                                 _nfs4_proc_link(inode, dir, name),
3602                                 &exception);
3603         } while (exception.retry);
3604         return err;
3605 }
3606
3607 struct nfs4_createdata {
3608         struct rpc_message msg;
3609         struct nfs4_create_arg arg;
3610         struct nfs4_create_res res;
3611         struct nfs_fh fh;
3612         struct nfs_fattr fattr;
3613         struct nfs4_label *label;
3614 };
3615
3616 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3617                 struct qstr *name, struct iattr *sattr, u32 ftype)
3618 {
3619         struct nfs4_createdata *data;
3620
3621         data = kzalloc(sizeof(*data), GFP_KERNEL);
3622         if (data != NULL) {
3623                 struct nfs_server *server = NFS_SERVER(dir);
3624
3625                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3626                 if (IS_ERR(data->label))
3627                         goto out_free;
3628
3629                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3630                 data->msg.rpc_argp = &data->arg;
3631                 data->msg.rpc_resp = &data->res;
3632                 data->arg.dir_fh = NFS_FH(dir);
3633                 data->arg.server = server;
3634                 data->arg.name = name;
3635                 data->arg.attrs = sattr;
3636                 data->arg.ftype = ftype;
3637                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3638                 data->res.server = server;
3639                 data->res.fh = &data->fh;
3640                 data->res.fattr = &data->fattr;
3641                 data->res.label = data->label;
3642                 nfs_fattr_init(data->res.fattr);
3643         }
3644         return data;
3645 out_free:
3646         kfree(data);
3647         return NULL;
3648 }
3649
3650 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3651 {
3652         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3653                                     &data->arg.seq_args, &data->res.seq_res, 1);
3654         if (status == 0) {
3655                 update_changeattr(dir, &data->res.dir_cinfo);
3656                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3657         }
3658         return status;
3659 }
3660
3661 static void nfs4_free_createdata(struct nfs4_createdata *data)
3662 {
3663         nfs4_label_free(data->label);
3664         kfree(data);
3665 }
3666
3667 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3668                 struct page *page, unsigned int len, struct iattr *sattr,
3669                 struct nfs4_label *label)
3670 {
3671         struct nfs4_createdata *data;
3672         int status = -ENAMETOOLONG;
3673
3674         if (len > NFS4_MAXPATHLEN)
3675                 goto out;
3676
3677         status = -ENOMEM;
3678         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3679         if (data == NULL)
3680                 goto out;
3681
3682         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3683         data->arg.u.symlink.pages = &page;
3684         data->arg.u.symlink.len = len;
3685         data->arg.label = label;
3686
3687         status = nfs4_do_create(dir, dentry, data);
3688
3689         nfs4_free_createdata(data);
3690 out:
3691         return status;
3692 }
3693
3694 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3695                 struct page *page, unsigned int len, struct iattr *sattr)
3696 {
3697         struct nfs4_exception exception = { };
3698         struct nfs4_label l, *label = NULL;
3699         int err;
3700
3701         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3702
3703         do {
3704                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3705                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3706                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3707                                 &exception);
3708         } while (exception.retry);
3709
3710         nfs4_label_release_security(label);
3711         return err;
3712 }
3713
3714 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3715                 struct iattr *sattr, struct nfs4_label *label)
3716 {
3717         struct nfs4_createdata *data;
3718         int status = -ENOMEM;
3719
3720         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3721         if (data == NULL)
3722                 goto out;
3723
3724         data->arg.label = label;
3725         status = nfs4_do_create(dir, dentry, data);
3726
3727         nfs4_free_createdata(data);
3728 out:
3729         return status;
3730 }
3731
3732 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3733                 struct iattr *sattr)
3734 {
3735         struct nfs4_exception exception = { };
3736         struct nfs4_label l, *label = NULL;
3737         int err;
3738
3739         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3740
3741         sattr->ia_mode &= ~current_umask();
3742         do {
3743                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3744                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3745                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3746                                 &exception);
3747         } while (exception.retry);
3748         nfs4_label_release_security(label);
3749
3750         return err;
3751 }
3752
3753 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3754                 u64 cookie, struct page **pages, unsigned int count, int plus)
3755 {
3756         struct inode            *dir = dentry->d_inode;
3757         struct nfs4_readdir_arg args = {
3758                 .fh = NFS_FH(dir),
3759                 .pages = pages,
3760                 .pgbase = 0,
3761                 .count = count,
3762                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3763                 .plus = plus,
3764         };
3765         struct nfs4_readdir_res res;
3766         struct rpc_message msg = {
3767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3768                 .rpc_argp = &args,
3769                 .rpc_resp = &res,
3770                 .rpc_cred = cred,
3771         };
3772         int                     status;
3773
3774         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3775                         dentry,
3776                         (unsigned long long)cookie);
3777         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3778         res.pgbase = args.pgbase;
3779         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3780         if (status >= 0) {
3781                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3782                 status += args.pgbase;
3783         }
3784
3785         nfs_invalidate_atime(dir);
3786
3787         dprintk("%s: returns %d\n", __func__, status);
3788         return status;
3789 }
3790
3791 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3792                 u64 cookie, struct page **pages, unsigned int count, int plus)
3793 {
3794         struct nfs4_exception exception = { };
3795         int err;
3796         do {
3797                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3798                                 pages, count, plus);
3799                 trace_nfs4_readdir(dentry->d_inode, err);
3800                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3801                                 &exception);
3802         } while (exception.retry);
3803         return err;
3804 }
3805
3806 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3807                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3808 {
3809         struct nfs4_createdata *data;
3810         int mode = sattr->ia_mode;
3811         int status = -ENOMEM;
3812
3813         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3814         if (data == NULL)
3815                 goto out;
3816
3817         if (S_ISFIFO(mode))
3818                 data->arg.ftype = NF4FIFO;
3819         else if (S_ISBLK(mode)) {
3820                 data->arg.ftype = NF4BLK;
3821                 data->arg.u.device.specdata1 = MAJOR(rdev);
3822                 data->arg.u.device.specdata2 = MINOR(rdev);
3823         }
3824         else if (S_ISCHR(mode)) {
3825                 data->arg.ftype = NF4CHR;
3826                 data->arg.u.device.specdata1 = MAJOR(rdev);
3827                 data->arg.u.device.specdata2 = MINOR(rdev);
3828         } else if (!S_ISSOCK(mode)) {
3829                 status = -EINVAL;
3830                 goto out_free;
3831         }
3832
3833         data->arg.label = label;
3834         status = nfs4_do_create(dir, dentry, data);
3835 out_free:
3836         nfs4_free_createdata(data);
3837 out:
3838         return status;
3839 }
3840
3841 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3842                 struct iattr *sattr, dev_t rdev)
3843 {
3844         struct nfs4_exception exception = { };
3845         struct nfs4_label l, *label = NULL;
3846         int err;
3847
3848         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3849
3850         sattr->ia_mode &= ~current_umask();
3851         do {
3852                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3853                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3854                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3855                                 &exception);
3856         } while (exception.retry);
3857
3858         nfs4_label_release_security(label);
3859
3860         return err;
3861 }
3862
3863 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3864                  struct nfs_fsstat *fsstat)
3865 {
3866         struct nfs4_statfs_arg args = {
3867                 .fh = fhandle,
3868                 .bitmask = server->attr_bitmask,
3869         };
3870         struct nfs4_statfs_res res = {
3871                 .fsstat = fsstat,
3872         };
3873         struct rpc_message msg = {
3874                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3875                 .rpc_argp = &args,
3876                 .rpc_resp = &res,
3877         };
3878
3879         nfs_fattr_init(fsstat->fattr);
3880         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3881 }
3882
3883 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3884 {
3885         struct nfs4_exception exception = { };
3886         int err;
3887         do {
3888                 err = nfs4_handle_exception(server,
3889                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3890                                 &exception);
3891         } while (exception.retry);
3892         return err;
3893 }
3894
3895 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3896                 struct nfs_fsinfo *fsinfo)
3897 {
3898         struct nfs4_fsinfo_arg args = {
3899                 .fh = fhandle,
3900                 .bitmask = server->attr_bitmask,
3901         };
3902         struct nfs4_fsinfo_res res = {
3903                 .fsinfo = fsinfo,
3904         };
3905         struct rpc_message msg = {
3906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3907                 .rpc_argp = &args,
3908                 .rpc_resp = &res,
3909         };
3910
3911         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3912 }
3913
3914 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3915 {
3916         struct nfs4_exception exception = { };
3917         unsigned long now = jiffies;
3918         int err;
3919
3920         do {
3921                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3922                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3923                 if (err == 0) {
3924                         struct nfs_client *clp = server->nfs_client;
3925
3926                         spin_lock(&clp->cl_lock);
3927                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3928                         clp->cl_last_renewal = now;
3929                         spin_unlock(&clp->cl_lock);
3930                         break;
3931                 }
3932                 err = nfs4_handle_exception(server, err, &exception);
3933         } while (exception.retry);
3934         return err;
3935 }
3936
3937 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3938 {
3939         int error;
3940
3941         nfs_fattr_init(fsinfo->fattr);
3942         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3943         if (error == 0) {
3944                 /* block layout checks this! */
3945                 server->pnfs_blksize = fsinfo->blksize;
3946                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3947         }
3948
3949         return error;
3950 }
3951
3952 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3953                 struct nfs_pathconf *pathconf)
3954 {
3955         struct nfs4_pathconf_arg args = {
3956                 .fh = fhandle,
3957                 .bitmask = server->attr_bitmask,
3958         };
3959         struct nfs4_pathconf_res res = {
3960                 .pathconf = pathconf,
3961         };
3962         struct rpc_message msg = {
3963                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3964                 .rpc_argp = &args,
3965                 .rpc_resp = &res,
3966         };
3967
3968         /* None of the pathconf attributes are mandatory to implement */
3969         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3970                 memset(pathconf, 0, sizeof(*pathconf));
3971                 return 0;
3972         }
3973
3974         nfs_fattr_init(pathconf->fattr);
3975         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3976 }
3977
3978 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3979                 struct nfs_pathconf *pathconf)
3980 {
3981         struct nfs4_exception exception = { };
3982         int err;
3983
3984         do {
3985                 err = nfs4_handle_exception(server,
3986                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3987                                 &exception);
3988         } while (exception.retry);
3989         return err;
3990 }
3991
3992 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3993                 const struct nfs_open_context *ctx,
3994                 const struct nfs_lock_context *l_ctx,
3995                 fmode_t fmode)
3996 {
3997         const struct nfs_lockowner *lockowner = NULL;
3998
3999         if (l_ctx != NULL)
4000                 lockowner = &l_ctx->lockowner;
4001         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4002 }
4003 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4004
4005 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4006                 const struct nfs_open_context *ctx,
4007                 const struct nfs_lock_context *l_ctx,
4008                 fmode_t fmode)
4009 {
4010         nfs4_stateid current_stateid;
4011
4012         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
4013                 return false;
4014         return nfs4_stateid_match(stateid, &current_stateid);
4015 }
4016
4017 static bool nfs4_error_stateid_expired(int err)
4018 {
4019         switch (err) {
4020         case -NFS4ERR_DELEG_REVOKED:
4021         case -NFS4ERR_ADMIN_REVOKED:
4022         case -NFS4ERR_BAD_STATEID:
4023         case -NFS4ERR_STALE_STATEID:
4024         case -NFS4ERR_OLD_STATEID:
4025         case -NFS4ERR_OPENMODE:
4026         case -NFS4ERR_EXPIRED:
4027                 return true;
4028         }
4029         return false;
4030 }
4031
4032 void __nfs4_read_done_cb(struct nfs_read_data *data)
4033 {
4034         nfs_invalidate_atime(data->header->inode);
4035 }
4036
4037 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
4038 {
4039         struct nfs_server *server = NFS_SERVER(data->header->inode);
4040
4041         trace_nfs4_read(data, task->tk_status);
4042         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4043                 rpc_restart_call_prepare(task);
4044                 return -EAGAIN;
4045         }
4046
4047         __nfs4_read_done_cb(data);
4048         if (task->tk_status > 0)
4049                 renew_lease(server, data->timestamp);
4050         return 0;
4051 }
4052
4053 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4054                 struct nfs_readargs *args)
4055 {
4056
4057         if (!nfs4_error_stateid_expired(task->tk_status) ||
4058                 nfs4_stateid_is_current(&args->stateid,
4059                                 args->context,
4060                                 args->lock_context,
4061                                 FMODE_READ))
4062                 return false;
4063         rpc_restart_call_prepare(task);
4064         return true;
4065 }
4066
4067 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4068 {
4069
4070         dprintk("--> %s\n", __func__);
4071
4072         if (!nfs4_sequence_done(task, &data->res.seq_res))
4073                 return -EAGAIN;
4074         if (nfs4_read_stateid_changed(task, &data->args))
4075                 return -EAGAIN;
4076         return data->read_done_cb ? data->read_done_cb(task, data) :
4077                                     nfs4_read_done_cb(task, data);
4078 }
4079
4080 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4081 {
4082         data->timestamp   = jiffies;
4083         data->read_done_cb = nfs4_read_done_cb;
4084         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4085         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4086 }
4087
4088 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4089 {
4090         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4091                         &data->args.seq_args,
4092                         &data->res.seq_res,
4093                         task))
4094                 return 0;
4095         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4096                                 data->args.lock_context, FMODE_READ) == -EIO)
4097                 return -EIO;
4098         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4099                 return -EIO;
4100         return 0;
4101 }
4102
4103 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4104 {
4105         struct inode *inode = data->header->inode;
4106
4107         trace_nfs4_write(data, task->tk_status);
4108         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4109                 rpc_restart_call_prepare(task);
4110                 return -EAGAIN;
4111         }
4112         if (task->tk_status >= 0) {
4113                 renew_lease(NFS_SERVER(inode), data->timestamp);
4114                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4115         }
4116         return 0;
4117 }
4118
4119 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4120                 struct nfs_writeargs *args)
4121 {
4122
4123         if (!nfs4_error_stateid_expired(task->tk_status) ||
4124                 nfs4_stateid_is_current(&args->stateid,
4125                                 args->context,
4126                                 args->lock_context,
4127                                 FMODE_WRITE))
4128                 return false;
4129         rpc_restart_call_prepare(task);
4130         return true;
4131 }
4132
4133 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4134 {
4135         if (!nfs4_sequence_done(task, &data->res.seq_res))
4136                 return -EAGAIN;
4137         if (nfs4_write_stateid_changed(task, &data->args))
4138                 return -EAGAIN;
4139         return data->write_done_cb ? data->write_done_cb(task, data) :
4140                 nfs4_write_done_cb(task, data);
4141 }
4142
4143 static
4144 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4145 {
4146         const struct nfs_pgio_header *hdr = data->header;
4147
4148         /* Don't request attributes for pNFS or O_DIRECT writes */
4149         if (data->ds_clp != NULL || hdr->dreq != NULL)
4150                 return false;
4151         /* Otherwise, request attributes if and only if we don't hold
4152          * a delegation
4153          */
4154         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4155 }
4156
4157 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4158 {
4159         struct nfs_server *server = NFS_SERVER(data->header->inode);
4160
4161         if (!nfs4_write_need_cache_consistency_data(data)) {
4162                 data->args.bitmask = NULL;
4163                 data->res.fattr = NULL;
4164         } else
4165                 data->args.bitmask = server->cache_consistency_bitmask;
4166
4167         if (!data->write_done_cb)
4168                 data->write_done_cb = nfs4_write_done_cb;
4169         data->res.server = server;
4170         data->timestamp   = jiffies;
4171
4172         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4173         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4174 }
4175
4176 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4177 {
4178         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4179                         &data->args.seq_args,
4180                         &data->res.seq_res,
4181                         task))
4182                 return 0;
4183         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4184                                 data->args.lock_context, FMODE_WRITE) == -EIO)
4185                 return -EIO;
4186         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4187                 return -EIO;
4188         return 0;
4189 }
4190
4191 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4192 {
4193         nfs4_setup_sequence(NFS_SERVER(data->inode),
4194                         &data->args.seq_args,
4195                         &data->res.seq_res,
4196                         task);
4197 }
4198
4199 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4200 {
4201         struct inode *inode = data->inode;
4202
4203         trace_nfs4_commit(data, task->tk_status);
4204         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4205                 rpc_restart_call_prepare(task);
4206                 return -EAGAIN;
4207         }
4208         return 0;
4209 }
4210
4211 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4212 {
4213         if (!nfs4_sequence_done(task, &data->res.seq_res))
4214                 return -EAGAIN;
4215         return data->commit_done_cb(task, data);
4216 }
4217
4218 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4219 {
4220         struct nfs_server *server = NFS_SERVER(data->inode);
4221
4222         if (data->commit_done_cb == NULL)
4223                 data->commit_done_cb = nfs4_commit_done_cb;
4224         data->res.server = server;
4225         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4226         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4227 }
4228
4229 struct nfs4_renewdata {
4230         struct nfs_client       *client;
4231         unsigned long           timestamp;
4232 };
4233
4234 /*
4235  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4236  * standalone procedure for queueing an asynchronous RENEW.
4237  */
4238 static void nfs4_renew_release(void *calldata)
4239 {
4240         struct nfs4_renewdata *data = calldata;
4241         struct nfs_client *clp = data->client;
4242
4243         if (atomic_read(&clp->cl_count) > 1)
4244                 nfs4_schedule_state_renewal(clp);
4245         nfs_put_client(clp);
4246         kfree(data);
4247 }
4248
4249 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4250 {
4251         struct nfs4_renewdata *data = calldata;
4252         struct nfs_client *clp = data->client;
4253         unsigned long timestamp = data->timestamp;
4254
4255         trace_nfs4_renew_async(clp, task->tk_status);
4256         switch (task->tk_status) {
4257         case 0:
4258                 break;
4259         case -NFS4ERR_LEASE_MOVED:
4260                 nfs4_schedule_lease_moved_recovery(clp);
4261                 break;
4262         default:
4263                 /* Unless we're shutting down, schedule state recovery! */
4264                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4265                         return;
4266                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4267                         nfs4_schedule_lease_recovery(clp);
4268                         return;
4269                 }
4270                 nfs4_schedule_path_down_recovery(clp);
4271         }
4272         do_renew_lease(clp, timestamp);
4273 }
4274
4275 static const struct rpc_call_ops nfs4_renew_ops = {
4276         .rpc_call_done = nfs4_renew_done,
4277         .rpc_release = nfs4_renew_release,
4278 };
4279
4280 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4281 {
4282         struct rpc_message msg = {
4283                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4284                 .rpc_argp       = clp,
4285                 .rpc_cred       = cred,
4286         };
4287         struct nfs4_renewdata *data;
4288
4289         if (renew_flags == 0)
4290                 return 0;
4291         if (!atomic_inc_not_zero(&clp->cl_count))
4292                 return -EIO;
4293         data = kmalloc(sizeof(*data), GFP_NOFS);
4294         if (data == NULL)
4295                 return -ENOMEM;
4296         data->client = clp;
4297         data->timestamp = jiffies;
4298         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4299                         &nfs4_renew_ops, data);
4300 }
4301
4302 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4303 {
4304         struct rpc_message msg = {
4305                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4306                 .rpc_argp       = clp,
4307                 .rpc_cred       = cred,
4308         };
4309         unsigned long now = jiffies;
4310         int status;
4311
4312         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4313         if (status < 0)
4314                 return status;
4315         do_renew_lease(clp, now);
4316         return 0;
4317 }
4318
4319 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4320 {
4321         return (server->caps & NFS_CAP_ACLS)
4322                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4323                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4324 }
4325
4326 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4327  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4328  * the stack.
4329  */
4330 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4331
4332 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4333                 struct page **pages, unsigned int *pgbase)
4334 {
4335         struct page *newpage, **spages;
4336         int rc = 0;
4337         size_t len;
4338         spages = pages;
4339
4340         do {
4341                 len = min_t(size_t, PAGE_SIZE, buflen);
4342                 newpage = alloc_page(GFP_KERNEL);
4343
4344                 if (newpage == NULL)
4345                         goto unwind;
4346                 memcpy(page_address(newpage), buf, len);
4347                 buf += len;
4348                 buflen -= len;
4349                 *pages++ = newpage;
4350                 rc++;
4351         } while (buflen != 0);
4352
4353         return rc;
4354
4355 unwind:
4356         for(; rc > 0; rc--)
4357                 __free_page(spages[rc-1]);
4358         return -ENOMEM;
4359 }
4360
4361 struct nfs4_cached_acl {
4362         int cached;
4363         size_t len;
4364         char data[0];
4365 };
4366
4367 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4368 {
4369         struct nfs_inode *nfsi = NFS_I(inode);
4370
4371         spin_lock(&inode->i_lock);
4372         kfree(nfsi->nfs4_acl);
4373         nfsi->nfs4_acl = acl;
4374         spin_unlock(&inode->i_lock);
4375 }
4376
4377 static void nfs4_zap_acl_attr(struct inode *inode)
4378 {
4379         nfs4_set_cached_acl(inode, NULL);
4380 }
4381
4382 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4383 {
4384         struct nfs_inode *nfsi = NFS_I(inode);
4385         struct nfs4_cached_acl *acl;
4386         int ret = -ENOENT;
4387
4388         spin_lock(&inode->i_lock);
4389         acl = nfsi->nfs4_acl;
4390         if (acl == NULL)
4391                 goto out;
4392         if (buf == NULL) /* user is just asking for length */
4393                 goto out_len;
4394         if (acl->cached == 0)
4395                 goto out;
4396         ret = -ERANGE; /* see getxattr(2) man page */
4397         if (acl->len > buflen)
4398                 goto out;
4399         memcpy(buf, acl->data, acl->len);
4400 out_len:
4401         ret = acl->len;
4402 out:
4403         spin_unlock(&inode->i_lock);
4404         return ret;
4405 }
4406
4407 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4408 {
4409         struct nfs4_cached_acl *acl;
4410         size_t buflen = sizeof(*acl) + acl_len;
4411
4412         if (buflen <= PAGE_SIZE) {
4413                 acl = kmalloc(buflen, GFP_KERNEL);
4414                 if (acl == NULL)
4415                         goto out;
4416                 acl->cached = 1;
4417                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4418         } else {
4419                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4420                 if (acl == NULL)
4421                         goto out;
4422                 acl->cached = 0;
4423         }
4424         acl->len = acl_len;
4425 out:
4426         nfs4_set_cached_acl(inode, acl);
4427 }
4428
4429 /*
4430  * The getxattr API returns the required buffer length when called with a
4431  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4432  * the required buf.  On a NULL buf, we send a page of data to the server
4433  * guessing that the ACL request can be serviced by a page. If so, we cache
4434  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4435  * the cache. If not so, we throw away the page, and cache the required
4436  * length. The next getxattr call will then produce another round trip to
4437  * the server, this time with the input buf of the required size.
4438  */
4439 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4440 {
4441         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4442         struct nfs_getaclargs args = {
4443                 .fh = NFS_FH(inode),
4444                 .acl_pages = pages,
4445                 .acl_len = buflen,
4446         };
4447         struct nfs_getaclres res = {
4448                 .acl_len = buflen,
4449         };
4450         struct rpc_message msg = {
4451                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4452                 .rpc_argp = &args,
4453                 .rpc_resp = &res,
4454         };
4455         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4456         int ret = -ENOMEM, i;
4457
4458         /* As long as we're doing a round trip to the server anyway,
4459          * let's be prepared for a page of acl data. */
4460         if (npages == 0)
4461                 npages = 1;
4462         if (npages > ARRAY_SIZE(pages))
4463                 return -ERANGE;
4464
4465         for (i = 0; i < npages; i++) {
4466                 pages[i] = alloc_page(GFP_KERNEL);
4467                 if (!pages[i])
4468                         goto out_free;
4469         }
4470
4471         /* for decoding across pages */
4472         res.acl_scratch = alloc_page(GFP_KERNEL);
4473         if (!res.acl_scratch)
4474                 goto out_free;
4475
4476         args.acl_len = npages * PAGE_SIZE;
4477         args.acl_pgbase = 0;
4478
4479         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4480                 __func__, buf, buflen, npages, args.acl_len);
4481         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4482                              &msg, &args.seq_args, &res.seq_res, 0);
4483         if (ret)
4484                 goto out_free;
4485
4486         /* Handle the case where the passed-in buffer is too short */
4487         if (res.acl_flags & NFS4_ACL_TRUNC) {
4488                 /* Did the user only issue a request for the acl length? */
4489                 if (buf == NULL)
4490                         goto out_ok;
4491                 ret = -ERANGE;
4492                 goto out_free;
4493         }
4494         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4495         if (buf) {
4496                 if (res.acl_len > buflen) {
4497                         ret = -ERANGE;
4498                         goto out_free;
4499                 }
4500                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4501         }
4502 out_ok:
4503         ret = res.acl_len;
4504 out_free:
4505         for (i = 0; i < npages; i++)
4506                 if (pages[i])
4507                         __free_page(pages[i]);
4508         if (res.acl_scratch)
4509                 __free_page(res.acl_scratch);
4510         return ret;
4511 }
4512
4513 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4514 {
4515         struct nfs4_exception exception = { };
4516         ssize_t ret;
4517         do {
4518                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4519                 trace_nfs4_get_acl(inode, ret);
4520                 if (ret >= 0)
4521                         break;
4522                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4523         } while (exception.retry);
4524         return ret;
4525 }
4526
4527 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4528 {
4529         struct nfs_server *server = NFS_SERVER(inode);
4530         int ret;
4531
4532         if (!nfs4_server_supports_acls(server))
4533                 return -EOPNOTSUPP;
4534         ret = nfs_revalidate_inode(server, inode);
4535         if (ret < 0)
4536                 return ret;
4537         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4538                 nfs_zap_acl_cache(inode);
4539         ret = nfs4_read_cached_acl(inode, buf, buflen);
4540         if (ret != -ENOENT)
4541                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4542                  * but no cached acl data, just the acl length */
4543                 return ret;
4544         return nfs4_get_acl_uncached(inode, buf, buflen);
4545 }
4546
4547 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4548 {
4549         struct nfs_server *server = NFS_SERVER(inode);
4550         struct page *pages[NFS4ACL_MAXPAGES];
4551         struct nfs_setaclargs arg = {
4552                 .fh             = NFS_FH(inode),
4553                 .acl_pages      = pages,
4554                 .acl_len        = buflen,
4555         };
4556         struct nfs_setaclres res;
4557         struct rpc_message msg = {
4558                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4559                 .rpc_argp       = &arg,
4560                 .rpc_resp       = &res,
4561         };
4562         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4563         int ret, i;
4564
4565         if (!nfs4_server_supports_acls(server))
4566                 return -EOPNOTSUPP;
4567         if (npages > ARRAY_SIZE(pages))
4568                 return -ERANGE;
4569         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4570         if (i < 0)
4571                 return i;
4572         nfs4_inode_return_delegation(inode);
4573         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4574
4575         /*
4576          * Free each page after tx, so the only ref left is
4577          * held by the network stack
4578          */
4579         for (; i > 0; i--)
4580                 put_page(pages[i-1]);
4581
4582         /*
4583          * Acl update can result in inode attribute update.
4584          * so mark the attribute cache invalid.
4585          */
4586         spin_lock(&inode->i_lock);
4587         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4588         spin_unlock(&inode->i_lock);
4589         nfs_access_zap_cache(inode);
4590         nfs_zap_acl_cache(inode);
4591         return ret;
4592 }
4593
4594 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4595 {
4596         struct nfs4_exception exception = { };
4597         int err;
4598         do {
4599                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4600                 trace_nfs4_set_acl(inode, err);
4601                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4602                                 &exception);
4603         } while (exception.retry);
4604         return err;
4605 }
4606
4607 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4608 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4609                                         size_t buflen)
4610 {
4611         struct nfs_server *server = NFS_SERVER(inode);
4612         struct nfs_fattr fattr;
4613         struct nfs4_label label = {0, 0, buflen, buf};
4614
4615         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4616         struct nfs4_getattr_arg arg = {
4617                 .fh             = NFS_FH(inode),
4618                 .bitmask        = bitmask,
4619         };
4620         struct nfs4_getattr_res res = {
4621                 .fattr          = &fattr,
4622                 .label          = &label,
4623                 .server         = server,
4624         };
4625         struct rpc_message msg = {
4626                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4627                 .rpc_argp       = &arg,
4628                 .rpc_resp       = &res,
4629         };
4630         int ret;
4631
4632         nfs_fattr_init(&fattr);
4633
4634         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4635         if (ret)
4636                 return ret;
4637         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4638                 return -ENOENT;
4639         if (buflen < label.len)
4640                 return -ERANGE;
4641         return 0;
4642 }
4643
4644 static int nfs4_get_security_label(struct inode *inode, void *buf,
4645                                         size_t buflen)
4646 {
4647         struct nfs4_exception exception = { };
4648         int err;
4649
4650         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4651                 return -EOPNOTSUPP;
4652
4653         do {
4654                 err = _nfs4_get_security_label(inode, buf, buflen);
4655                 trace_nfs4_get_security_label(inode, err);
4656                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4657                                 &exception);
4658         } while (exception.retry);
4659         return err;
4660 }
4661
4662 static int _nfs4_do_set_security_label(struct inode *inode,
4663                 struct nfs4_label *ilabel,
4664                 struct nfs_fattr *fattr,
4665                 struct nfs4_label *olabel)
4666 {
4667
4668         struct iattr sattr = {0};
4669         struct nfs_server *server = NFS_SERVER(inode);
4670         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4671         struct nfs_setattrargs arg = {
4672                 .fh             = NFS_FH(inode),
4673                 .iap            = &sattr,
4674                 .server         = server,
4675                 .bitmask        = bitmask,
4676                 .label          = ilabel,
4677         };
4678         struct nfs_setattrres res = {
4679                 .fattr          = fattr,
4680                 .label          = olabel,
4681                 .server         = server,
4682         };
4683         struct rpc_message msg = {
4684                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4685                 .rpc_argp       = &arg,
4686                 .rpc_resp       = &res,
4687         };
4688         int status;
4689
4690         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4691
4692         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4693         if (status)
4694                 dprintk("%s failed: %d\n", __func__, status);
4695
4696         return status;
4697 }
4698
4699 static int nfs4_do_set_security_label(struct inode *inode,
4700                 struct nfs4_label *ilabel,
4701                 struct nfs_fattr *fattr,
4702                 struct nfs4_label *olabel)
4703 {
4704         struct nfs4_exception exception = { };
4705         int err;
4706
4707         do {
4708                 err = _nfs4_do_set_security_label(inode, ilabel,
4709                                 fattr, olabel);
4710                 trace_nfs4_set_security_label(inode, err);
4711                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4712                                 &exception);
4713         } while (exception.retry);
4714         return err;
4715 }
4716
4717 static int
4718 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4719 {
4720         struct nfs4_label ilabel, *olabel = NULL;
4721         struct nfs_fattr fattr;
4722         struct rpc_cred *cred;
4723         struct inode *inode = dentry->d_inode;
4724         int status;
4725
4726         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4727                 return -EOPNOTSUPP;
4728
4729         nfs_fattr_init(&fattr);
4730
4731         ilabel.pi = 0;
4732         ilabel.lfs = 0;
4733         ilabel.label = (char *)buf;
4734         ilabel.len = buflen;
4735
4736         cred = rpc_lookup_cred();
4737         if (IS_ERR(cred))
4738                 return PTR_ERR(cred);
4739
4740         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4741         if (IS_ERR(olabel)) {
4742                 status = -PTR_ERR(olabel);
4743                 goto out;
4744         }
4745
4746         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4747         if (status == 0)
4748                 nfs_setsecurity(inode, &fattr, olabel);
4749
4750         nfs4_label_free(olabel);
4751 out:
4752         put_rpccred(cred);
4753         return status;
4754 }
4755 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4756
4757
4758 static int
4759 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4760 {
4761         struct nfs_client *clp = server->nfs_client;
4762
4763         if (task->tk_status >= 0)
4764                 return 0;
4765         switch(task->tk_status) {
4766                 case -NFS4ERR_DELEG_REVOKED:
4767                 case -NFS4ERR_ADMIN_REVOKED:
4768                 case -NFS4ERR_BAD_STATEID:
4769                         if (state == NULL)
4770                                 break;
4771                         nfs_remove_bad_delegation(state->inode);
4772                 case -NFS4ERR_OPENMODE:
4773                         if (state == NULL)
4774                                 break;
4775                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4776                                 goto recovery_failed;
4777                         goto wait_on_recovery;
4778                 case -NFS4ERR_EXPIRED:
4779                         if (state != NULL) {
4780                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4781                                         goto recovery_failed;
4782                         }
4783                 case -NFS4ERR_STALE_STATEID:
4784                 case -NFS4ERR_STALE_CLIENTID:
4785                         nfs4_schedule_lease_recovery(clp);
4786                         goto wait_on_recovery;
4787                 case -NFS4ERR_MOVED:
4788                         if (nfs4_schedule_migration_recovery(server) < 0)
4789                                 goto recovery_failed;
4790                         goto wait_on_recovery;
4791                 case -NFS4ERR_LEASE_MOVED:
4792                         nfs4_schedule_lease_moved_recovery(clp);
4793                         goto wait_on_recovery;
4794 #if defined(CONFIG_NFS_V4_1)
4795                 case -NFS4ERR_BADSESSION:
4796                 case -NFS4ERR_BADSLOT:
4797                 case -NFS4ERR_BAD_HIGH_SLOT:
4798                 case -NFS4ERR_DEADSESSION:
4799                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4800                 case -NFS4ERR_SEQ_FALSE_RETRY:
4801                 case -NFS4ERR_SEQ_MISORDERED:
4802                         dprintk("%s ERROR %d, Reset session\n", __func__,
4803                                 task->tk_status);
4804                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4805                         goto restart_call;
4806 #endif /* CONFIG_NFS_V4_1 */
4807                 case -NFS4ERR_DELAY:
4808                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4809                 case -NFS4ERR_GRACE:
4810                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4811                 case -NFS4ERR_RETRY_UNCACHED_REP:
4812                 case -NFS4ERR_OLD_STATEID:
4813                         goto restart_call;
4814         }
4815         task->tk_status = nfs4_map_errors(task->tk_status);
4816         return 0;
4817 recovery_failed:
4818         task->tk_status = -EIO;
4819         return 0;
4820 wait_on_recovery:
4821         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4822         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4823                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4824         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4825                 goto recovery_failed;
4826 restart_call:
4827         task->tk_status = 0;
4828         return -EAGAIN;
4829 }
4830
4831 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4832                                     nfs4_verifier *bootverf)
4833 {
4834         __be32 verf[2];
4835
4836         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4837                 /* An impossible timestamp guarantees this value
4838                  * will never match a generated boot time. */
4839                 verf[0] = 0;
4840                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4841         } else {
4842                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4843                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4844                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4845         }
4846         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4847 }
4848
4849 static unsigned int
4850 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4851                                    char *buf, size_t len)
4852 {
4853         unsigned int result;
4854
4855         rcu_read_lock();
4856         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4857                                 clp->cl_ipaddr,
4858                                 rpc_peeraddr2str(clp->cl_rpcclient,
4859                                                         RPC_DISPLAY_ADDR),
4860                                 rpc_peeraddr2str(clp->cl_rpcclient,
4861                                                         RPC_DISPLAY_PROTO));
4862         rcu_read_unlock();
4863         return result;
4864 }
4865
4866 static unsigned int
4867 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4868                                 char *buf, size_t len)
4869 {
4870         const char *nodename = clp->cl_rpcclient->cl_nodename;
4871
4872         if (nfs4_client_id_uniquifier[0] != '\0')
4873                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4874                                 clp->rpc_ops->version,
4875                                 clp->cl_minorversion,
4876                                 nfs4_client_id_uniquifier,
4877                                 nodename);
4878         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4879                                 clp->rpc_ops->version, clp->cl_minorversion,
4880                                 nodename);
4881 }
4882
4883 /**
4884  * nfs4_proc_setclientid - Negotiate client ID
4885  * @clp: state data structure
4886  * @program: RPC program for NFSv4 callback service
4887  * @port: IP port number for NFS4 callback service
4888  * @cred: RPC credential to use for this call
4889  * @res: where to place the result
4890  *
4891  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4892  */
4893 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4894                 unsigned short port, struct rpc_cred *cred,
4895                 struct nfs4_setclientid_res *res)
4896 {
4897         nfs4_verifier sc_verifier;
4898         struct nfs4_setclientid setclientid = {
4899                 .sc_verifier = &sc_verifier,
4900                 .sc_prog = program,
4901                 .sc_cb_ident = clp->cl_cb_ident,
4902         };
4903         struct rpc_message msg = {
4904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4905                 .rpc_argp = &setclientid,
4906                 .rpc_resp = res,
4907                 .rpc_cred = cred,
4908         };
4909         int status;
4910
4911         /* nfs_client_id4 */
4912         nfs4_init_boot_verifier(clp, &sc_verifier);
4913         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4914                 setclientid.sc_name_len =
4915                                 nfs4_init_uniform_client_string(clp,
4916                                                 setclientid.sc_name,
4917                                                 sizeof(setclientid.sc_name));
4918         else
4919                 setclientid.sc_name_len =
4920                                 nfs4_init_nonuniform_client_string(clp,
4921                                                 setclientid.sc_name,
4922                                                 sizeof(setclientid.sc_name));
4923         /* cb_client4 */
4924         rcu_read_lock();
4925         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4926                                 sizeof(setclientid.sc_netid), "%s",
4927                                 rpc_peeraddr2str(clp->cl_rpcclient,
4928                                                         RPC_DISPLAY_NETID));
4929         rcu_read_unlock();
4930         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4931                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4932                                 clp->cl_ipaddr, port >> 8, port & 255);
4933
4934         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4935                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4936                 setclientid.sc_name_len, setclientid.sc_name);
4937         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4938         trace_nfs4_setclientid(clp, status);
4939         dprintk("NFS reply setclientid: %d\n", status);
4940         return status;
4941 }
4942
4943 /**
4944  * nfs4_proc_setclientid_confirm - Confirm client ID
4945  * @clp: state data structure
4946  * @res: result of a previous SETCLIENTID
4947  * @cred: RPC credential to use for this call
4948  *
4949  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4950  */
4951 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4952                 struct nfs4_setclientid_res *arg,
4953                 struct rpc_cred *cred)
4954 {
4955         struct rpc_message msg = {
4956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4957                 .rpc_argp = arg,
4958                 .rpc_cred = cred,
4959         };
4960         int status;
4961
4962         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4963                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4964                 clp->cl_clientid);
4965         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4966         trace_nfs4_setclientid_confirm(clp, status);
4967         dprintk("NFS reply setclientid_confirm: %d\n", status);
4968         return status;
4969 }
4970
4971 struct nfs4_delegreturndata {
4972         struct nfs4_delegreturnargs args;
4973         struct nfs4_delegreturnres res;
4974         struct nfs_fh fh;
4975         nfs4_stateid stateid;
4976         unsigned long timestamp;
4977         struct nfs_fattr fattr;
4978         int rpc_status;
4979 };
4980
4981 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4982 {
4983         struct nfs4_delegreturndata *data = calldata;
4984
4985         if (!nfs4_sequence_done(task, &data->res.seq_res))
4986                 return;
4987
4988         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4989         switch (task->tk_status) {
4990         case -NFS4ERR_STALE_STATEID:
4991         case -NFS4ERR_EXPIRED:
4992         case 0:
4993                 renew_lease(data->res.server, data->timestamp);
4994                 break;
4995         default:
4996                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4997                                 -EAGAIN) {
4998                         rpc_restart_call_prepare(task);
4999                         return;
5000                 }
5001         }
5002         data->rpc_status = task->tk_status;
5003 }
5004
5005 static void nfs4_delegreturn_release(void *calldata)
5006 {
5007         kfree(calldata);
5008 }
5009
5010 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5011 {
5012         struct nfs4_delegreturndata *d_data;
5013
5014         d_data = (struct nfs4_delegreturndata *)data;
5015
5016         nfs4_setup_sequence(d_data->res.server,
5017                         &d_data->args.seq_args,
5018                         &d_data->res.seq_res,
5019                         task);
5020 }
5021
5022 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5023         .rpc_call_prepare = nfs4_delegreturn_prepare,
5024         .rpc_call_done = nfs4_delegreturn_done,
5025         .rpc_release = nfs4_delegreturn_release,
5026 };
5027
5028 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5029 {
5030         struct nfs4_delegreturndata *data;
5031         struct nfs_server *server = NFS_SERVER(inode);
5032         struct rpc_task *task;
5033         struct rpc_message msg = {
5034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5035                 .rpc_cred = cred,
5036         };
5037         struct rpc_task_setup task_setup_data = {
5038                 .rpc_client = server->client,
5039                 .rpc_message = &msg,
5040                 .callback_ops = &nfs4_delegreturn_ops,
5041                 .flags = RPC_TASK_ASYNC,
5042         };
5043         int status = 0;
5044
5045         data = kzalloc(sizeof(*data), GFP_NOFS);
5046         if (data == NULL)
5047                 return -ENOMEM;
5048         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5049         data->args.fhandle = &data->fh;
5050         data->args.stateid = &data->stateid;
5051         data->args.bitmask = server->cache_consistency_bitmask;
5052         nfs_copy_fh(&data->fh, NFS_FH(inode));
5053         nfs4_stateid_copy(&data->stateid, stateid);
5054         data->res.fattr = &data->fattr;
5055         data->res.server = server;
5056         nfs_fattr_init(data->res.fattr);
5057         data->timestamp = jiffies;
5058         data->rpc_status = 0;
5059
5060         task_setup_data.callback_data = data;
5061         msg.rpc_argp = &data->args;
5062         msg.rpc_resp = &data->res;
5063         task = rpc_run_task(&task_setup_data);
5064         if (IS_ERR(task))
5065                 return PTR_ERR(task);
5066         if (!issync)
5067                 goto out;
5068         status = nfs4_wait_for_completion_rpc_task(task);
5069         if (status != 0)
5070                 goto out;
5071         status = data->rpc_status;
5072         if (status == 0)
5073                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5074         else
5075                 nfs_refresh_inode(inode, &data->fattr);
5076 out:
5077         rpc_put_task(task);
5078         return status;
5079 }
5080
5081 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5082 {
5083         struct nfs_server *server = NFS_SERVER(inode);
5084         struct nfs4_exception exception = { };
5085         int err;
5086         do {
5087                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5088                 trace_nfs4_delegreturn(inode, err);
5089                 switch (err) {
5090                         case -NFS4ERR_STALE_STATEID:
5091                         case -NFS4ERR_EXPIRED:
5092                         case 0:
5093                                 return 0;
5094                 }
5095                 err = nfs4_handle_exception(server, err, &exception);
5096         } while (exception.retry);
5097         return err;
5098 }
5099
5100 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5101 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5102
5103 /*
5104  * sleep, with exponential backoff, and retry the LOCK operation.
5105  */
5106 static unsigned long
5107 nfs4_set_lock_task_retry(unsigned long timeout)
5108 {
5109         freezable_schedule_timeout_killable_unsafe(timeout);
5110         timeout <<= 1;
5111         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5112                 return NFS4_LOCK_MAXTIMEOUT;
5113         return timeout;
5114 }
5115
5116 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5117 {
5118         struct inode *inode = state->inode;
5119         struct nfs_server *server = NFS_SERVER(inode);
5120         struct nfs_client *clp = server->nfs_client;
5121         struct nfs_lockt_args arg = {
5122                 .fh = NFS_FH(inode),
5123                 .fl = request,
5124         };
5125         struct nfs_lockt_res res = {
5126                 .denied = request,
5127         };
5128         struct rpc_message msg = {
5129                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5130                 .rpc_argp       = &arg,
5131                 .rpc_resp       = &res,
5132                 .rpc_cred       = state->owner->so_cred,
5133         };
5134         struct nfs4_lock_state *lsp;
5135         int status;
5136
5137         arg.lock_owner.clientid = clp->cl_clientid;
5138         status = nfs4_set_lock_state(state, request);
5139         if (status != 0)
5140                 goto out;
5141         lsp = request->fl_u.nfs4_fl.owner;
5142         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5143         arg.lock_owner.s_dev = server->s_dev;
5144         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5145         switch (status) {
5146                 case 0:
5147                         request->fl_type = F_UNLCK;
5148                         break;
5149                 case -NFS4ERR_DENIED:
5150                         status = 0;
5151         }
5152         request->fl_ops->fl_release_private(request);
5153         request->fl_ops = NULL;
5154 out:
5155         return status;
5156 }
5157
5158 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5159 {
5160         struct nfs4_exception exception = { };
5161         int err;
5162
5163         do {
5164                 err = _nfs4_proc_getlk(state, cmd, request);
5165                 trace_nfs4_get_lock(request, state, cmd, err);
5166                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5167                                 &exception);
5168         } while (exception.retry);
5169         return err;
5170 }
5171
5172 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5173 {
5174         int res = 0;
5175         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5176                 case FL_POSIX:
5177                         res = posix_lock_file_wait(file, fl);
5178                         break;
5179                 case FL_FLOCK:
5180                         res = flock_lock_file_wait(file, fl);
5181                         break;
5182                 default:
5183                         BUG();
5184         }
5185         return res;
5186 }
5187
5188 struct nfs4_unlockdata {
5189         struct nfs_locku_args arg;
5190         struct nfs_locku_res res;
5191         struct nfs4_lock_state *lsp;
5192         struct nfs_open_context *ctx;
5193         struct file_lock fl;
5194         const struct nfs_server *server;
5195         unsigned long timestamp;
5196 };
5197
5198 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5199                 struct nfs_open_context *ctx,
5200                 struct nfs4_lock_state *lsp,
5201                 struct nfs_seqid *seqid)
5202 {
5203         struct nfs4_unlockdata *p;
5204         struct inode *inode = lsp->ls_state->inode;
5205
5206         p = kzalloc(sizeof(*p), GFP_NOFS);
5207         if (p == NULL)
5208                 return NULL;
5209         p->arg.fh = NFS_FH(inode);
5210         p->arg.fl = &p->fl;
5211         p->arg.seqid = seqid;
5212         p->res.seqid = seqid;
5213         p->arg.stateid = &lsp->ls_stateid;
5214         p->lsp = lsp;
5215         atomic_inc(&lsp->ls_count);
5216         /* Ensure we don't close file until we're done freeing locks! */
5217         p->ctx = get_nfs_open_context(ctx);
5218         memcpy(&p->fl, fl, sizeof(p->fl));
5219         p->server = NFS_SERVER(inode);
5220         return p;
5221 }
5222
5223 static void nfs4_locku_release_calldata(void *data)
5224 {
5225         struct nfs4_unlockdata *calldata = data;
5226         nfs_free_seqid(calldata->arg.seqid);
5227         nfs4_put_lock_state(calldata->lsp);
5228         put_nfs_open_context(calldata->ctx);
5229         kfree(calldata);
5230 }
5231
5232 static void nfs4_locku_done(struct rpc_task *task, void *data)
5233 {
5234         struct nfs4_unlockdata *calldata = data;
5235
5236         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5237                 return;
5238         switch (task->tk_status) {
5239                 case 0:
5240                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5241                                         &calldata->res.stateid);
5242                         renew_lease(calldata->server, calldata->timestamp);
5243                         break;
5244                 case -NFS4ERR_BAD_STATEID:
5245                 case -NFS4ERR_OLD_STATEID:
5246                 case -NFS4ERR_STALE_STATEID:
5247                 case -NFS4ERR_EXPIRED:
5248                         break;
5249                 default:
5250                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5251                                 rpc_restart_call_prepare(task);
5252         }
5253         nfs_release_seqid(calldata->arg.seqid);
5254 }
5255
5256 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5257 {
5258         struct nfs4_unlockdata *calldata = data;
5259
5260         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5261                 goto out_wait;
5262         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5263                 /* Note: exit _without_ running nfs4_locku_done */
5264                 goto out_no_action;
5265         }
5266         calldata->timestamp = jiffies;
5267         if (nfs4_setup_sequence(calldata->server,
5268                                 &calldata->arg.seq_args,
5269                                 &calldata->res.seq_res,
5270                                 task) != 0)
5271                 nfs_release_seqid(calldata->arg.seqid);
5272         return;
5273 out_no_action:
5274         task->tk_action = NULL;
5275 out_wait:
5276         nfs4_sequence_done(task, &calldata->res.seq_res);
5277 }
5278
5279 static const struct rpc_call_ops nfs4_locku_ops = {
5280         .rpc_call_prepare = nfs4_locku_prepare,
5281         .rpc_call_done = nfs4_locku_done,
5282         .rpc_release = nfs4_locku_release_calldata,
5283 };
5284
5285 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5286                 struct nfs_open_context *ctx,
5287                 struct nfs4_lock_state *lsp,
5288                 struct nfs_seqid *seqid)
5289 {
5290         struct nfs4_unlockdata *data;
5291         struct rpc_message msg = {
5292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5293                 .rpc_cred = ctx->cred,
5294         };
5295         struct rpc_task_setup task_setup_data = {
5296                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5297                 .rpc_message = &msg,
5298                 .callback_ops = &nfs4_locku_ops,
5299                 .workqueue = nfsiod_workqueue,
5300                 .flags = RPC_TASK_ASYNC,
5301         };
5302
5303         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5304                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5305
5306         /* Ensure this is an unlock - when canceling a lock, the
5307          * canceled lock is passed in, and it won't be an unlock.
5308          */
5309         fl->fl_type = F_UNLCK;
5310
5311         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5312         if (data == NULL) {
5313                 nfs_free_seqid(seqid);
5314                 return ERR_PTR(-ENOMEM);
5315         }
5316
5317         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5318         msg.rpc_argp = &data->arg;
5319         msg.rpc_resp = &data->res;
5320         task_setup_data.callback_data = data;
5321         return rpc_run_task(&task_setup_data);
5322 }
5323
5324 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5325 {
5326         struct inode *inode = state->inode;
5327         struct nfs4_state_owner *sp = state->owner;
5328         struct nfs_inode *nfsi = NFS_I(inode);
5329         struct nfs_seqid *seqid;
5330         struct nfs4_lock_state *lsp;
5331         struct rpc_task *task;
5332         int status = 0;
5333         unsigned char fl_flags = request->fl_flags;
5334
5335         status = nfs4_set_lock_state(state, request);
5336         /* Unlock _before_ we do the RPC call */
5337         request->fl_flags |= FL_EXISTS;
5338         /* Exclude nfs_delegation_claim_locks() */
5339         mutex_lock(&sp->so_delegreturn_mutex);
5340         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5341         down_read(&nfsi->rwsem);
5342         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5343                 up_read(&nfsi->rwsem);
5344                 mutex_unlock(&sp->so_delegreturn_mutex);
5345                 goto out;
5346         }
5347         up_read(&nfsi->rwsem);
5348         mutex_unlock(&sp->so_delegreturn_mutex);
5349         if (status != 0)
5350                 goto out;
5351         /* Is this a delegated lock? */
5352         lsp = request->fl_u.nfs4_fl.owner;
5353         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5354                 goto out;
5355         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5356         status = -ENOMEM;
5357         if (seqid == NULL)
5358                 goto out;
5359         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5360         status = PTR_ERR(task);
5361         if (IS_ERR(task))
5362                 goto out;
5363         status = nfs4_wait_for_completion_rpc_task(task);
5364         rpc_put_task(task);
5365 out:
5366         request->fl_flags = fl_flags;
5367         trace_nfs4_unlock(request, state, F_SETLK, status);
5368         return status;
5369 }
5370
5371 struct nfs4_lockdata {
5372         struct nfs_lock_args arg;
5373         struct nfs_lock_res res;
5374         struct nfs4_lock_state *lsp;
5375         struct nfs_open_context *ctx;
5376         struct file_lock fl;
5377         unsigned long timestamp;
5378         int rpc_status;
5379         int cancelled;
5380         struct nfs_server *server;
5381 };
5382
5383 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5384                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5385                 gfp_t gfp_mask)
5386 {
5387         struct nfs4_lockdata *p;
5388         struct inode *inode = lsp->ls_state->inode;
5389         struct nfs_server *server = NFS_SERVER(inode);
5390
5391         p = kzalloc(sizeof(*p), gfp_mask);
5392         if (p == NULL)
5393                 return NULL;
5394
5395         p->arg.fh = NFS_FH(inode);
5396         p->arg.fl = &p->fl;
5397         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5398         if (p->arg.open_seqid == NULL)
5399                 goto out_free;
5400         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5401         if (p->arg.lock_seqid == NULL)
5402                 goto out_free_seqid;
5403         p->arg.lock_stateid = &lsp->ls_stateid;
5404         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5405         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5406         p->arg.lock_owner.s_dev = server->s_dev;
5407         p->res.lock_seqid = p->arg.lock_seqid;
5408         p->lsp = lsp;
5409         p->server = server;
5410         atomic_inc(&lsp->ls_count);
5411         p->ctx = get_nfs_open_context(ctx);
5412         memcpy(&p->fl, fl, sizeof(p->fl));
5413         return p;
5414 out_free_seqid:
5415         nfs_free_seqid(p->arg.open_seqid);
5416 out_free:
5417         kfree(p);
5418         return NULL;
5419 }
5420
5421 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5422 {
5423         struct nfs4_lockdata *data = calldata;
5424         struct nfs4_state *state = data->lsp->ls_state;
5425
5426         dprintk("%s: begin!\n", __func__);
5427         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5428                 goto out_wait;
5429         /* Do we need to do an open_to_lock_owner? */
5430         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5431                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5432                         goto out_release_lock_seqid;
5433                 }
5434                 data->arg.open_stateid = &state->open_stateid;
5435                 data->arg.new_lock_owner = 1;
5436                 data->res.open_seqid = data->arg.open_seqid;
5437         } else
5438                 data->arg.new_lock_owner = 0;
5439         if (!nfs4_valid_open_stateid(state)) {
5440                 data->rpc_status = -EBADF;
5441                 task->tk_action = NULL;
5442                 goto out_release_open_seqid;
5443         }
5444         data->timestamp = jiffies;
5445         if (nfs4_setup_sequence(data->server,
5446                                 &data->arg.seq_args,
5447                                 &data->res.seq_res,
5448                                 task) == 0)
5449                 return;
5450 out_release_open_seqid:
5451         nfs_release_seqid(data->arg.open_seqid);
5452 out_release_lock_seqid:
5453         nfs_release_seqid(data->arg.lock_seqid);
5454 out_wait:
5455         nfs4_sequence_done(task, &data->res.seq_res);
5456         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5457 }
5458
5459 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5460 {
5461         struct nfs4_lockdata *data = calldata;
5462
5463         dprintk("%s: begin!\n", __func__);
5464
5465         if (!nfs4_sequence_done(task, &data->res.seq_res))
5466                 return;
5467
5468         data->rpc_status = task->tk_status;
5469         if (data->arg.new_lock_owner != 0) {
5470                 if (data->rpc_status == 0)
5471                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5472                 else
5473                         goto out;
5474         }
5475         if (data->rpc_status == 0) {
5476                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5477                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5478                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5479         }
5480 out:
5481         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5482 }
5483
5484 static void nfs4_lock_release(void *calldata)
5485 {
5486         struct nfs4_lockdata *data = calldata;
5487
5488         dprintk("%s: begin!\n", __func__);
5489         nfs_free_seqid(data->arg.open_seqid);
5490         if (data->cancelled != 0) {
5491                 struct rpc_task *task;
5492                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5493                                 data->arg.lock_seqid);
5494                 if (!IS_ERR(task))
5495                         rpc_put_task_async(task);
5496                 dprintk("%s: cancelling lock!\n", __func__);
5497         } else
5498                 nfs_free_seqid(data->arg.lock_seqid);
5499         nfs4_put_lock_state(data->lsp);
5500         put_nfs_open_context(data->ctx);
5501         kfree(data);
5502         dprintk("%s: done!\n", __func__);
5503 }
5504
5505 static const struct rpc_call_ops nfs4_lock_ops = {
5506         .rpc_call_prepare = nfs4_lock_prepare,
5507         .rpc_call_done = nfs4_lock_done,
5508         .rpc_release = nfs4_lock_release,
5509 };
5510
5511 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5512 {
5513         switch (error) {
5514         case -NFS4ERR_ADMIN_REVOKED:
5515         case -NFS4ERR_BAD_STATEID:
5516                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5517                 if (new_lock_owner != 0 ||
5518                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5519                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5520                 break;
5521         case -NFS4ERR_STALE_STATEID:
5522                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5523         case -NFS4ERR_EXPIRED:
5524                 nfs4_schedule_lease_recovery(server->nfs_client);
5525         };
5526 }
5527
5528 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5529 {
5530         struct nfs4_lockdata *data;
5531         struct rpc_task *task;
5532         struct rpc_message msg = {
5533                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5534                 .rpc_cred = state->owner->so_cred,
5535         };
5536         struct rpc_task_setup task_setup_data = {
5537                 .rpc_client = NFS_CLIENT(state->inode),
5538                 .rpc_message = &msg,
5539                 .callback_ops = &nfs4_lock_ops,
5540                 .workqueue = nfsiod_workqueue,
5541                 .flags = RPC_TASK_ASYNC,
5542         };
5543         int ret;
5544
5545         dprintk("%s: begin!\n", __func__);
5546         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5547                         fl->fl_u.nfs4_fl.owner,
5548                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5549         if (data == NULL)
5550                 return -ENOMEM;
5551         if (IS_SETLKW(cmd))
5552                 data->arg.block = 1;
5553         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5554         msg.rpc_argp = &data->arg;
5555         msg.rpc_resp = &data->res;
5556         task_setup_data.callback_data = data;
5557         if (recovery_type > NFS_LOCK_NEW) {
5558                 if (recovery_type == NFS_LOCK_RECLAIM)
5559                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5560                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5561         }
5562         task = rpc_run_task(&task_setup_data);
5563         if (IS_ERR(task))
5564                 return PTR_ERR(task);
5565         ret = nfs4_wait_for_completion_rpc_task(task);
5566         if (ret == 0) {
5567                 ret = data->rpc_status;
5568                 if (ret)
5569                         nfs4_handle_setlk_error(data->server, data->lsp,
5570                                         data->arg.new_lock_owner, ret);
5571         } else
5572                 data->cancelled = 1;
5573         rpc_put_task(task);
5574         dprintk("%s: done, ret = %d!\n", __func__, ret);
5575         return ret;
5576 }
5577
5578 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5579 {
5580         struct nfs_server *server = NFS_SERVER(state->inode);
5581         struct nfs4_exception exception = {
5582                 .inode = state->inode,
5583         };
5584         int err;
5585
5586         do {
5587                 /* Cache the lock if possible... */
5588                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5589                         return 0;
5590                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5591                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5592                 if (err != -NFS4ERR_DELAY)
5593                         break;
5594                 nfs4_handle_exception(server, err, &exception);
5595         } while (exception.retry);
5596         return err;
5597 }
5598
5599 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5600 {
5601         struct nfs_server *server = NFS_SERVER(state->inode);
5602         struct nfs4_exception exception = {
5603                 .inode = state->inode,
5604         };
5605         int err;
5606
5607         err = nfs4_set_lock_state(state, request);
5608         if (err != 0)
5609                 return err;
5610         if (!recover_lost_locks) {
5611                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5612                 return 0;
5613         }
5614         do {
5615                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5616                         return 0;
5617                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5618                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5619                 switch (err) {
5620                 default:
5621                         goto out;
5622                 case -NFS4ERR_GRACE:
5623                 case -NFS4ERR_DELAY:
5624                         nfs4_handle_exception(server, err, &exception);
5625                         err = 0;
5626                 }
5627         } while (exception.retry);
5628 out:
5629         return err;
5630 }
5631
5632 #if defined(CONFIG_NFS_V4_1)
5633 /**
5634  * nfs41_check_expired_locks - possibly free a lock stateid
5635  *
5636  * @state: NFSv4 state for an inode
5637  *
5638  * Returns NFS_OK if recovery for this stateid is now finished.
5639  * Otherwise a negative NFS4ERR value is returned.
5640  */
5641 static int nfs41_check_expired_locks(struct nfs4_state *state)
5642 {
5643         int status, ret = -NFS4ERR_BAD_STATEID;
5644         struct nfs4_lock_state *lsp;
5645         struct nfs_server *server = NFS_SERVER(state->inode);
5646
5647         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5648                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5649                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5650
5651                         status = nfs41_test_stateid(server,
5652                                         &lsp->ls_stateid,
5653                                         cred);
5654                         trace_nfs4_test_lock_stateid(state, lsp, status);
5655                         if (status != NFS_OK) {
5656                                 /* Free the stateid unless the server
5657                                  * informs us the stateid is unrecognized. */
5658                                 if (status != -NFS4ERR_BAD_STATEID)
5659                                         nfs41_free_stateid(server,
5660                                                         &lsp->ls_stateid,
5661                                                         cred);
5662                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5663                                 ret = status;
5664                         }
5665                 }
5666         };
5667
5668         return ret;
5669 }
5670
5671 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5672 {
5673         int status = NFS_OK;
5674
5675         if (test_bit(LK_STATE_IN_USE, &state->flags))
5676                 status = nfs41_check_expired_locks(state);
5677         if (status != NFS_OK)
5678                 status = nfs4_lock_expired(state, request);
5679         return status;
5680 }
5681 #endif
5682
5683 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5684 {
5685         struct nfs4_state_owner *sp = state->owner;
5686         struct nfs_inode *nfsi = NFS_I(state->inode);
5687         unsigned char fl_flags = request->fl_flags;
5688         unsigned int seq;
5689         int status = -ENOLCK;
5690
5691         if ((fl_flags & FL_POSIX) &&
5692                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5693                 goto out;
5694         /* Is this a delegated open? */
5695         status = nfs4_set_lock_state(state, request);
5696         if (status != 0)
5697                 goto out;
5698         request->fl_flags |= FL_ACCESS;
5699         status = do_vfs_lock(request->fl_file, request);
5700         if (status < 0)
5701                 goto out;
5702         down_read(&nfsi->rwsem);
5703         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5704                 /* Yes: cache locks! */
5705                 /* ...but avoid races with delegation recall... */
5706                 request->fl_flags = fl_flags & ~FL_SLEEP;
5707                 status = do_vfs_lock(request->fl_file, request);
5708                 goto out_unlock;
5709         }
5710         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5711         up_read(&nfsi->rwsem);
5712         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5713         if (status != 0)
5714                 goto out;
5715         down_read(&nfsi->rwsem);
5716         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5717                 status = -NFS4ERR_DELAY;
5718                 goto out_unlock;
5719         }
5720         /* Note: we always want to sleep here! */
5721         request->fl_flags = fl_flags | FL_SLEEP;
5722         if (do_vfs_lock(request->fl_file, request) < 0)
5723                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5724                         "manager!\n", __func__);
5725 out_unlock:
5726         up_read(&nfsi->rwsem);
5727 out:
5728         request->fl_flags = fl_flags;
5729         return status;
5730 }
5731
5732 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5733 {
5734         struct nfs4_exception exception = {
5735                 .state = state,
5736                 .inode = state->inode,
5737         };
5738         int err;
5739
5740         do {
5741                 err = _nfs4_proc_setlk(state, cmd, request);
5742                 trace_nfs4_set_lock(request, state, cmd, err);
5743                 if (err == -NFS4ERR_DENIED)
5744                         err = -EAGAIN;
5745                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5746                                 err, &exception);
5747         } while (exception.retry);
5748         return err;
5749 }
5750
5751 static int
5752 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5753 {
5754         struct nfs_open_context *ctx;
5755         struct nfs4_state *state;
5756         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5757         int status;
5758
5759         /* verify open state */
5760         ctx = nfs_file_open_context(filp);
5761         state = ctx->state;
5762
5763         if (request->fl_start < 0 || request->fl_end < 0)
5764                 return -EINVAL;
5765
5766         if (IS_GETLK(cmd)) {
5767                 if (state != NULL)
5768                         return nfs4_proc_getlk(state, F_GETLK, request);
5769                 return 0;
5770         }
5771
5772         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5773                 return -EINVAL;
5774
5775         if (request->fl_type == F_UNLCK) {
5776                 if (state != NULL)
5777                         return nfs4_proc_unlck(state, cmd, request);
5778                 return 0;
5779         }
5780
5781         if (state == NULL)
5782                 return -ENOLCK;
5783         /*
5784          * Don't rely on the VFS having checked the file open mode,
5785          * since it won't do this for flock() locks.
5786          */
5787         switch (request->fl_type) {
5788         case F_RDLCK:
5789                 if (!(filp->f_mode & FMODE_READ))
5790                         return -EBADF;
5791                 break;
5792         case F_WRLCK:
5793                 if (!(filp->f_mode & FMODE_WRITE))
5794                         return -EBADF;
5795         }
5796
5797         do {
5798                 status = nfs4_proc_setlk(state, cmd, request);
5799                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5800                         break;
5801                 timeout = nfs4_set_lock_task_retry(timeout);
5802                 status = -ERESTARTSYS;
5803                 if (signalled())
5804                         break;
5805         } while(status < 0);
5806         return status;
5807 }
5808
5809 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5810 {
5811         struct nfs_server *server = NFS_SERVER(state->inode);
5812         int err;
5813
5814         err = nfs4_set_lock_state(state, fl);
5815         if (err != 0)
5816                 return err;
5817         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5818         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5819 }
5820
5821 struct nfs_release_lockowner_data {
5822         struct nfs4_lock_state *lsp;
5823         struct nfs_server *server;
5824         struct nfs_release_lockowner_args args;
5825         struct nfs4_sequence_args seq_args;
5826         struct nfs4_sequence_res seq_res;
5827         unsigned long timestamp;
5828 };
5829
5830 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5831 {
5832         struct nfs_release_lockowner_data *data = calldata;
5833         nfs40_setup_sequence(data->server,
5834                                 &data->seq_args, &data->seq_res, task);
5835         data->timestamp = jiffies;
5836 }
5837
5838 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5839 {
5840         struct nfs_release_lockowner_data *data = calldata;
5841         struct nfs_server *server = data->server;
5842
5843         nfs40_sequence_done(task, &data->seq_res);
5844
5845         switch (task->tk_status) {
5846         case 0:
5847                 renew_lease(server, data->timestamp);
5848                 break;
5849         case -NFS4ERR_STALE_CLIENTID:
5850         case -NFS4ERR_EXPIRED:
5851         case -NFS4ERR_LEASE_MOVED:
5852         case -NFS4ERR_DELAY:
5853                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN)
5854                         rpc_restart_call_prepare(task);
5855         }
5856 }
5857
5858 static void nfs4_release_lockowner_release(void *calldata)
5859 {
5860         struct nfs_release_lockowner_data *data = calldata;
5861         nfs4_free_lock_state(data->server, data->lsp);
5862         kfree(calldata);
5863 }
5864
5865 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5866         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5867         .rpc_call_done = nfs4_release_lockowner_done,
5868         .rpc_release = nfs4_release_lockowner_release,
5869 };
5870
5871 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5872 {
5873         struct nfs_release_lockowner_data *data;
5874         struct rpc_message msg = {
5875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5876         };
5877
5878         if (server->nfs_client->cl_mvops->minor_version != 0)
5879                 return -EINVAL;
5880
5881         data = kmalloc(sizeof(*data), GFP_NOFS);
5882         if (!data)
5883                 return -ENOMEM;
5884         nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5885         data->lsp = lsp;
5886         data->server = server;
5887         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5888         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5889         data->args.lock_owner.s_dev = server->s_dev;
5890
5891         msg.rpc_argp = &data->args;
5892         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5893         return 0;
5894 }
5895
5896 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5897
5898 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5899                                    const void *buf, size_t buflen,
5900                                    int flags, int type)
5901 {
5902         if (strcmp(key, "") != 0)
5903                 return -EINVAL;
5904
5905         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5906 }
5907
5908 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5909                                    void *buf, size_t buflen, int type)
5910 {
5911         if (strcmp(key, "") != 0)
5912                 return -EINVAL;
5913
5914         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5915 }
5916
5917 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5918                                        size_t list_len, const char *name,
5919                                        size_t name_len, int type)
5920 {
5921         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5922
5923         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5924                 return 0;
5925
5926         if (list && len <= list_len)
5927                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5928         return len;
5929 }
5930
5931 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5932 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5933 {
5934         return server->caps & NFS_CAP_SECURITY_LABEL;
5935 }
5936
5937 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5938                                    const void *buf, size_t buflen,
5939                                    int flags, int type)
5940 {
5941         if (security_ismaclabel(key))
5942                 return nfs4_set_security_label(dentry, buf, buflen);
5943
5944         return -EOPNOTSUPP;
5945 }
5946
5947 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5948                                    void *buf, size_t buflen, int type)
5949 {
5950         if (security_ismaclabel(key))
5951                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5952         return -EOPNOTSUPP;
5953 }
5954
5955 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5956                                        size_t list_len, const char *name,
5957                                        size_t name_len, int type)
5958 {
5959         size_t len = 0;
5960
5961         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5962                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5963                 if (list && len <= list_len)
5964                         security_inode_listsecurity(dentry->d_inode, list, len);
5965         }
5966         return len;
5967 }
5968
5969 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5970         .prefix = XATTR_SECURITY_PREFIX,
5971         .list   = nfs4_xattr_list_nfs4_label,
5972         .get    = nfs4_xattr_get_nfs4_label,
5973         .set    = nfs4_xattr_set_nfs4_label,
5974 };
5975 #endif
5976
5977
5978 /*
5979  * nfs_fhget will use either the mounted_on_fileid or the fileid
5980  */
5981 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5982 {
5983         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5984                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5985               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5986               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5987                 return;
5988
5989         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5990                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5991         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5992         fattr->nlink = 2;
5993 }
5994
5995 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5996                                    const struct qstr *name,
5997                                    struct nfs4_fs_locations *fs_locations,
5998                                    struct page *page)
5999 {
6000         struct nfs_server *server = NFS_SERVER(dir);
6001         u32 bitmask[3] = {
6002                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6003         };
6004         struct nfs4_fs_locations_arg args = {
6005                 .dir_fh = NFS_FH(dir),
6006                 .name = name,
6007                 .page = page,
6008                 .bitmask = bitmask,
6009         };
6010         struct nfs4_fs_locations_res res = {
6011                 .fs_locations = fs_locations,
6012         };
6013         struct rpc_message msg = {
6014                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6015                 .rpc_argp = &args,
6016                 .rpc_resp = &res,
6017         };
6018         int status;
6019
6020         dprintk("%s: start\n", __func__);
6021
6022         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6023          * is not supported */
6024         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6025                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6026         else
6027                 bitmask[0] |= FATTR4_WORD0_FILEID;
6028
6029         nfs_fattr_init(&fs_locations->fattr);
6030         fs_locations->server = server;
6031         fs_locations->nlocations = 0;
6032         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6033         dprintk("%s: returned status = %d\n", __func__, status);
6034         return status;
6035 }
6036
6037 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6038                            const struct qstr *name,
6039                            struct nfs4_fs_locations *fs_locations,
6040                            struct page *page)
6041 {
6042         struct nfs4_exception exception = { };
6043         int err;
6044         do {
6045                 err = _nfs4_proc_fs_locations(client, dir, name,
6046                                 fs_locations, page);
6047                 trace_nfs4_get_fs_locations(dir, name, err);
6048                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6049                                 &exception);
6050         } while (exception.retry);
6051         return err;
6052 }
6053
6054 /*
6055  * This operation also signals the server that this client is
6056  * performing migration recovery.  The server can stop returning
6057  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6058  * appended to this compound to identify the client ID which is
6059  * performing recovery.
6060  */
6061 static int _nfs40_proc_get_locations(struct inode *inode,
6062                                      struct nfs4_fs_locations *locations,
6063                                      struct page *page, struct rpc_cred *cred)
6064 {
6065         struct nfs_server *server = NFS_SERVER(inode);
6066         struct rpc_clnt *clnt = server->client;
6067         u32 bitmask[2] = {
6068                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6069         };
6070         struct nfs4_fs_locations_arg args = {
6071                 .clientid       = server->nfs_client->cl_clientid,
6072                 .fh             = NFS_FH(inode),
6073                 .page           = page,
6074                 .bitmask        = bitmask,
6075                 .migration      = 1,            /* skip LOOKUP */
6076                 .renew          = 1,            /* append RENEW */
6077         };
6078         struct nfs4_fs_locations_res res = {
6079                 .fs_locations   = locations,
6080                 .migration      = 1,
6081                 .renew          = 1,
6082         };
6083         struct rpc_message msg = {
6084                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6085                 .rpc_argp       = &args,
6086                 .rpc_resp       = &res,
6087                 .rpc_cred       = cred,
6088         };
6089         unsigned long now = jiffies;
6090         int status;
6091
6092         nfs_fattr_init(&locations->fattr);
6093         locations->server = server;
6094         locations->nlocations = 0;
6095
6096         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6097         nfs4_set_sequence_privileged(&args.seq_args);
6098         status = nfs4_call_sync_sequence(clnt, server, &msg,
6099                                         &args.seq_args, &res.seq_res);
6100         if (status)
6101                 return status;
6102
6103         renew_lease(server, now);
6104         return 0;
6105 }
6106
6107 #ifdef CONFIG_NFS_V4_1
6108
6109 /*
6110  * This operation also signals the server that this client is
6111  * performing migration recovery.  The server can stop asserting
6112  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6113  * performing this operation is identified in the SEQUENCE
6114  * operation in this compound.
6115  *
6116  * When the client supports GETATTR(fs_locations_info), it can
6117  * be plumbed in here.
6118  */
6119 static int _nfs41_proc_get_locations(struct inode *inode,
6120                                      struct nfs4_fs_locations *locations,
6121                                      struct page *page, struct rpc_cred *cred)
6122 {
6123         struct nfs_server *server = NFS_SERVER(inode);
6124         struct rpc_clnt *clnt = server->client;
6125         u32 bitmask[2] = {
6126                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6127         };
6128         struct nfs4_fs_locations_arg args = {
6129                 .fh             = NFS_FH(inode),
6130                 .page           = page,
6131                 .bitmask        = bitmask,
6132                 .migration      = 1,            /* skip LOOKUP */
6133         };
6134         struct nfs4_fs_locations_res res = {
6135                 .fs_locations   = locations,
6136                 .migration      = 1,
6137         };
6138         struct rpc_message msg = {
6139                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6140                 .rpc_argp       = &args,
6141                 .rpc_resp       = &res,
6142                 .rpc_cred       = cred,
6143         };
6144         int status;
6145
6146         nfs_fattr_init(&locations->fattr);
6147         locations->server = server;
6148         locations->nlocations = 0;
6149
6150         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6151         nfs4_set_sequence_privileged(&args.seq_args);
6152         status = nfs4_call_sync_sequence(clnt, server, &msg,
6153                                         &args.seq_args, &res.seq_res);
6154         if (status == NFS4_OK &&
6155             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6156                 status = -NFS4ERR_LEASE_MOVED;
6157         return status;
6158 }
6159
6160 #endif  /* CONFIG_NFS_V4_1 */
6161
6162 /**
6163  * nfs4_proc_get_locations - discover locations for a migrated FSID
6164  * @inode: inode on FSID that is migrating
6165  * @locations: result of query
6166  * @page: buffer
6167  * @cred: credential to use for this operation
6168  *
6169  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6170  * operation failed, or a negative errno if a local error occurred.
6171  *
6172  * On success, "locations" is filled in, but if the server has
6173  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6174  * asserted.
6175  *
6176  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6177  * from this client that require migration recovery.
6178  */
6179 int nfs4_proc_get_locations(struct inode *inode,
6180                             struct nfs4_fs_locations *locations,
6181                             struct page *page, struct rpc_cred *cred)
6182 {
6183         struct nfs_server *server = NFS_SERVER(inode);
6184         struct nfs_client *clp = server->nfs_client;
6185         const struct nfs4_mig_recovery_ops *ops =
6186                                         clp->cl_mvops->mig_recovery_ops;
6187         struct nfs4_exception exception = { };
6188         int status;
6189
6190         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6191                 (unsigned long long)server->fsid.major,
6192                 (unsigned long long)server->fsid.minor,
6193                 clp->cl_hostname);
6194         nfs_display_fhandle(NFS_FH(inode), __func__);
6195
6196         do {
6197                 status = ops->get_locations(inode, locations, page, cred);
6198                 if (status != -NFS4ERR_DELAY)
6199                         break;
6200                 nfs4_handle_exception(server, status, &exception);
6201         } while (exception.retry);
6202         return status;
6203 }
6204
6205 /*
6206  * This operation also signals the server that this client is
6207  * performing "lease moved" recovery.  The server can stop
6208  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6209  * is appended to this compound to identify the client ID which is
6210  * performing recovery.
6211  */
6212 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6213 {
6214         struct nfs_server *server = NFS_SERVER(inode);
6215         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6216         struct rpc_clnt *clnt = server->client;
6217         struct nfs4_fsid_present_arg args = {
6218                 .fh             = NFS_FH(inode),
6219                 .clientid       = clp->cl_clientid,
6220                 .renew          = 1,            /* append RENEW */
6221         };
6222         struct nfs4_fsid_present_res res = {
6223                 .renew          = 1,
6224         };
6225         struct rpc_message msg = {
6226                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6227                 .rpc_argp       = &args,
6228                 .rpc_resp       = &res,
6229                 .rpc_cred       = cred,
6230         };
6231         unsigned long now = jiffies;
6232         int status;
6233
6234         res.fh = nfs_alloc_fhandle();
6235         if (res.fh == NULL)
6236                 return -ENOMEM;
6237
6238         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6239         nfs4_set_sequence_privileged(&args.seq_args);
6240         status = nfs4_call_sync_sequence(clnt, server, &msg,
6241                                                 &args.seq_args, &res.seq_res);
6242         nfs_free_fhandle(res.fh);
6243         if (status)
6244                 return status;
6245
6246         do_renew_lease(clp, now);
6247         return 0;
6248 }
6249
6250 #ifdef CONFIG_NFS_V4_1
6251
6252 /*
6253  * This operation also signals the server that this client is
6254  * performing "lease moved" recovery.  The server can stop asserting
6255  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6256  * this operation is identified in the SEQUENCE operation in this
6257  * compound.
6258  */
6259 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6260 {
6261         struct nfs_server *server = NFS_SERVER(inode);
6262         struct rpc_clnt *clnt = server->client;
6263         struct nfs4_fsid_present_arg args = {
6264                 .fh             = NFS_FH(inode),
6265         };
6266         struct nfs4_fsid_present_res res = {
6267         };
6268         struct rpc_message msg = {
6269                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6270                 .rpc_argp       = &args,
6271                 .rpc_resp       = &res,
6272                 .rpc_cred       = cred,
6273         };
6274         int status;
6275
6276         res.fh = nfs_alloc_fhandle();
6277         if (res.fh == NULL)
6278                 return -ENOMEM;
6279
6280         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6281         nfs4_set_sequence_privileged(&args.seq_args);
6282         status = nfs4_call_sync_sequence(clnt, server, &msg,
6283                                                 &args.seq_args, &res.seq_res);
6284         nfs_free_fhandle(res.fh);
6285         if (status == NFS4_OK &&
6286             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6287                 status = -NFS4ERR_LEASE_MOVED;
6288         return status;
6289 }
6290
6291 #endif  /* CONFIG_NFS_V4_1 */
6292
6293 /**
6294  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6295  * @inode: inode on FSID to check
6296  * @cred: credential to use for this operation
6297  *
6298  * Server indicates whether the FSID is present, moved, or not
6299  * recognized.  This operation is necessary to clear a LEASE_MOVED
6300  * condition for this client ID.
6301  *
6302  * Returns NFS4_OK if the FSID is present on this server,
6303  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6304  *  NFS4ERR code if some error occurred on the server, or a
6305  *  negative errno if a local failure occurred.
6306  */
6307 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6308 {
6309         struct nfs_server *server = NFS_SERVER(inode);
6310         struct nfs_client *clp = server->nfs_client;
6311         const struct nfs4_mig_recovery_ops *ops =
6312                                         clp->cl_mvops->mig_recovery_ops;
6313         struct nfs4_exception exception = { };
6314         int status;
6315
6316         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6317                 (unsigned long long)server->fsid.major,
6318                 (unsigned long long)server->fsid.minor,
6319                 clp->cl_hostname);
6320         nfs_display_fhandle(NFS_FH(inode), __func__);
6321
6322         do {
6323                 status = ops->fsid_present(inode, cred);
6324                 if (status != -NFS4ERR_DELAY)
6325                         break;
6326                 nfs4_handle_exception(server, status, &exception);
6327         } while (exception.retry);
6328         return status;
6329 }
6330
6331 /**
6332  * If 'use_integrity' is true and the state managment nfs_client
6333  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6334  * and the machine credential as per RFC3530bis and RFC5661 Security
6335  * Considerations sections. Otherwise, just use the user cred with the
6336  * filesystem's rpc_client.
6337  */
6338 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6339 {
6340         int status;
6341         struct nfs4_secinfo_arg args = {
6342                 .dir_fh = NFS_FH(dir),
6343                 .name   = name,
6344         };
6345         struct nfs4_secinfo_res res = {
6346                 .flavors     = flavors,
6347         };
6348         struct rpc_message msg = {
6349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6350                 .rpc_argp = &args,
6351                 .rpc_resp = &res,
6352         };
6353         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6354         struct rpc_cred *cred = NULL;
6355
6356         if (use_integrity) {
6357                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6358                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6359                 msg.rpc_cred = cred;
6360         }
6361
6362         dprintk("NFS call  secinfo %s\n", name->name);
6363
6364         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6365                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6366
6367         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6368                                 &res.seq_res, 0);
6369         dprintk("NFS reply  secinfo: %d\n", status);
6370
6371         if (cred)
6372                 put_rpccred(cred);
6373
6374         return status;
6375 }
6376
6377 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6378                       struct nfs4_secinfo_flavors *flavors)
6379 {
6380         struct nfs4_exception exception = { };
6381         int err;
6382         do {
6383                 err = -NFS4ERR_WRONGSEC;
6384
6385                 /* try to use integrity protection with machine cred */
6386                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6387                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6388
6389                 /*
6390                  * if unable to use integrity protection, or SECINFO with
6391                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6392                  * disallowed by spec, but exists in deployed servers) use
6393                  * the current filesystem's rpc_client and the user cred.
6394                  */
6395                 if (err == -NFS4ERR_WRONGSEC)
6396                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6397
6398                 trace_nfs4_secinfo(dir, name, err);
6399                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6400                                 &exception);
6401         } while (exception.retry);
6402         return err;
6403 }
6404
6405 #ifdef CONFIG_NFS_V4_1
6406 /*
6407  * Check the exchange flags returned by the server for invalid flags, having
6408  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6409  * DS flags set.
6410  */
6411 static int nfs4_check_cl_exchange_flags(u32 flags)
6412 {
6413         if (flags & ~EXCHGID4_FLAG_MASK_R)
6414                 goto out_inval;
6415         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6416             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6417                 goto out_inval;
6418         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6419                 goto out_inval;
6420         return NFS_OK;
6421 out_inval:
6422         return -NFS4ERR_INVAL;
6423 }
6424
6425 static bool
6426 nfs41_same_server_scope(struct nfs41_server_scope *a,
6427                         struct nfs41_server_scope *b)
6428 {
6429         if (a->server_scope_sz == b->server_scope_sz &&
6430             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6431                 return true;
6432
6433         return false;
6434 }
6435
6436 /*
6437  * nfs4_proc_bind_conn_to_session()
6438  *
6439  * The 4.1 client currently uses the same TCP connection for the
6440  * fore and backchannel.
6441  */
6442 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6443 {
6444         int status;
6445         struct nfs41_bind_conn_to_session_res res;
6446         struct rpc_message msg = {
6447                 .rpc_proc =
6448                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6449                 .rpc_argp = clp,
6450                 .rpc_resp = &res,
6451                 .rpc_cred = cred,
6452         };
6453
6454         dprintk("--> %s\n", __func__);
6455
6456         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6457         if (unlikely(res.session == NULL)) {
6458                 status = -ENOMEM;
6459                 goto out;
6460         }
6461
6462         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6463         trace_nfs4_bind_conn_to_session(clp, status);
6464         if (status == 0) {
6465                 if (memcmp(res.session->sess_id.data,
6466                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6467                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6468                         status = -EIO;
6469                         goto out_session;
6470                 }
6471                 if (res.dir != NFS4_CDFS4_BOTH) {
6472                         dprintk("NFS: %s: Unexpected direction from server\n",
6473                                 __func__);
6474                         status = -EIO;
6475                         goto out_session;
6476                 }
6477                 if (res.use_conn_in_rdma_mode) {
6478                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6479                                 __func__);
6480                         status = -EIO;
6481                         goto out_session;
6482                 }
6483         }
6484 out_session:
6485         kfree(res.session);
6486 out:
6487         dprintk("<-- %s status= %d\n", __func__, status);
6488         return status;
6489 }
6490
6491 /*
6492  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6493  * and operations we'd like to see to enable certain features in the allow map
6494  */
6495 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6496         .how = SP4_MACH_CRED,
6497         .enforce.u.words = {
6498                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6499                       1 << (OP_EXCHANGE_ID - 32) |
6500                       1 << (OP_CREATE_SESSION - 32) |
6501                       1 << (OP_DESTROY_SESSION - 32) |
6502                       1 << (OP_DESTROY_CLIENTID - 32)
6503         },
6504         .allow.u.words = {
6505                 [0] = 1 << (OP_CLOSE) |
6506                       1 << (OP_LOCKU) |
6507                       1 << (OP_COMMIT),
6508                 [1] = 1 << (OP_SECINFO - 32) |
6509                       1 << (OP_SECINFO_NO_NAME - 32) |
6510                       1 << (OP_TEST_STATEID - 32) |
6511                       1 << (OP_FREE_STATEID - 32) |
6512                       1 << (OP_WRITE - 32)
6513         }
6514 };
6515
6516 /*
6517  * Select the state protection mode for client `clp' given the server results
6518  * from exchange_id in `sp'.
6519  *
6520  * Returns 0 on success, negative errno otherwise.
6521  */
6522 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6523                                  struct nfs41_state_protection *sp)
6524 {
6525         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6526                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6527                       1 << (OP_EXCHANGE_ID - 32) |
6528                       1 << (OP_CREATE_SESSION - 32) |
6529                       1 << (OP_DESTROY_SESSION - 32) |
6530                       1 << (OP_DESTROY_CLIENTID - 32)
6531         };
6532         unsigned int i;
6533
6534         if (sp->how == SP4_MACH_CRED) {
6535                 /* Print state protect result */
6536                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6537                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6538                         if (test_bit(i, sp->enforce.u.longs))
6539                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6540                         if (test_bit(i, sp->allow.u.longs))
6541                                 dfprintk(MOUNT, "  allow op %d\n", i);
6542                 }
6543
6544                 /* make sure nothing is on enforce list that isn't supported */
6545                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6546                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6547                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6548                                 return -EINVAL;
6549                         }
6550                 }
6551
6552                 /*
6553                  * Minimal mode - state operations are allowed to use machine
6554                  * credential.  Note this already happens by default, so the
6555                  * client doesn't have to do anything more than the negotiation.
6556                  *
6557                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6558                  *       we're already using the machine cred for exchange_id
6559                  *       and will never use a different cred.
6560                  */
6561                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6562                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6563                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6564                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6565                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6566                         dfprintk(MOUNT, "  minimal mode enabled\n");
6567                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6568                 } else {
6569                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6570                         return -EINVAL;
6571                 }
6572
6573                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6574                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6575                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6576                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6577                 }
6578
6579                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6580                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6581                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6582                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6583                 }
6584
6585                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6586                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6587                         dfprintk(MOUNT, "  stateid mode enabled\n");
6588                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6589                 }
6590
6591                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6592                         dfprintk(MOUNT, "  write mode enabled\n");
6593                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6594                 }
6595
6596                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6597                         dfprintk(MOUNT, "  commit mode enabled\n");
6598                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6599                 }
6600         }
6601
6602         return 0;
6603 }
6604
6605 /*
6606  * _nfs4_proc_exchange_id()
6607  *
6608  * Wrapper for EXCHANGE_ID operation.
6609  */
6610 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6611         u32 sp4_how)
6612 {
6613         nfs4_verifier verifier;
6614         struct nfs41_exchange_id_args args = {
6615                 .verifier = &verifier,
6616                 .client = clp,
6617 #ifdef CONFIG_NFS_V4_1_MIGRATION
6618                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6619                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6620                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6621 #else
6622                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6623                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6624 #endif
6625         };
6626         struct nfs41_exchange_id_res res = {
6627                 0
6628         };
6629         int status;
6630         struct rpc_message msg = {
6631                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6632                 .rpc_argp = &args,
6633                 .rpc_resp = &res,
6634                 .rpc_cred = cred,
6635         };
6636
6637         nfs4_init_boot_verifier(clp, &verifier);
6638         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6639                                                         sizeof(args.id));
6640         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6641                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6642                 args.id_len, args.id);
6643
6644         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6645                                         GFP_NOFS);
6646         if (unlikely(res.server_owner == NULL)) {
6647                 status = -ENOMEM;
6648                 goto out;
6649         }
6650
6651         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6652                                         GFP_NOFS);
6653         if (unlikely(res.server_scope == NULL)) {
6654                 status = -ENOMEM;
6655                 goto out_server_owner;
6656         }
6657
6658         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6659         if (unlikely(res.impl_id == NULL)) {
6660                 status = -ENOMEM;
6661                 goto out_server_scope;
6662         }
6663
6664         switch (sp4_how) {
6665         case SP4_NONE:
6666                 args.state_protect.how = SP4_NONE;
6667                 break;
6668
6669         case SP4_MACH_CRED:
6670                 args.state_protect = nfs4_sp4_mach_cred_request;
6671                 break;
6672
6673         default:
6674                 /* unsupported! */
6675                 WARN_ON_ONCE(1);
6676                 status = -EINVAL;
6677                 goto out_server_scope;
6678         }
6679
6680         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6681         trace_nfs4_exchange_id(clp, status);
6682         if (status == 0)
6683                 status = nfs4_check_cl_exchange_flags(res.flags);
6684
6685         if (status == 0)
6686                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6687
6688         if (status == 0) {
6689                 clp->cl_clientid = res.clientid;
6690                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6691                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6692                         clp->cl_seqid = res.seqid;
6693
6694                 kfree(clp->cl_serverowner);
6695                 clp->cl_serverowner = res.server_owner;
6696                 res.server_owner = NULL;
6697
6698                 /* use the most recent implementation id */
6699                 kfree(clp->cl_implid);
6700                 clp->cl_implid = res.impl_id;
6701
6702                 if (clp->cl_serverscope != NULL &&
6703                     !nfs41_same_server_scope(clp->cl_serverscope,
6704                                              res.server_scope)) {
6705                         dprintk("%s: server_scope mismatch detected\n",
6706                                 __func__);
6707                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6708                         kfree(clp->cl_serverscope);
6709                         clp->cl_serverscope = NULL;
6710                 }
6711
6712                 if (clp->cl_serverscope == NULL) {
6713                         clp->cl_serverscope = res.server_scope;
6714                         goto out;
6715                 }
6716         } else
6717                 kfree(res.impl_id);
6718
6719 out_server_owner:
6720         kfree(res.server_owner);
6721 out_server_scope:
6722         kfree(res.server_scope);
6723 out:
6724         if (clp->cl_implid != NULL)
6725                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6726                         "domain: %s, name: %s, date: %llu,%u\n",
6727                         clp->cl_implid->domain, clp->cl_implid->name,
6728                         clp->cl_implid->date.seconds,
6729                         clp->cl_implid->date.nseconds);
6730         dprintk("NFS reply exchange_id: %d\n", status);
6731         return status;
6732 }
6733
6734 /*
6735  * nfs4_proc_exchange_id()
6736  *
6737  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6738  *
6739  * Since the clientid has expired, all compounds using sessions
6740  * associated with the stale clientid will be returning
6741  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6742  * be in some phase of session reset.
6743  *
6744  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6745  */
6746 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6747 {
6748         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6749         int status;
6750
6751         /* try SP4_MACH_CRED if krb5i/p */
6752         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6753             authflavor == RPC_AUTH_GSS_KRB5P) {
6754                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6755                 if (!status)
6756                         return 0;
6757         }
6758
6759         /* try SP4_NONE */
6760         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6761 }
6762
6763 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6764                 struct rpc_cred *cred)
6765 {
6766         struct rpc_message msg = {
6767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6768                 .rpc_argp = clp,
6769                 .rpc_cred = cred,
6770         };
6771         int status;
6772
6773         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6774         trace_nfs4_destroy_clientid(clp, status);
6775         if (status)
6776                 dprintk("NFS: Got error %d from the server %s on "
6777                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6778         return status;
6779 }
6780
6781 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6782                 struct rpc_cred *cred)
6783 {
6784         unsigned int loop;
6785         int ret;
6786
6787         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6788                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6789                 switch (ret) {
6790                 case -NFS4ERR_DELAY:
6791                 case -NFS4ERR_CLIENTID_BUSY:
6792                         ssleep(1);
6793                         break;
6794                 default:
6795                         return ret;
6796                 }
6797         }
6798         return 0;
6799 }
6800
6801 int nfs4_destroy_clientid(struct nfs_client *clp)
6802 {
6803         struct rpc_cred *cred;
6804         int ret = 0;
6805
6806         if (clp->cl_mvops->minor_version < 1)
6807                 goto out;
6808         if (clp->cl_exchange_flags == 0)
6809                 goto out;
6810         if (clp->cl_preserve_clid)
6811                 goto out;
6812         cred = nfs4_get_clid_cred(clp);
6813         ret = nfs4_proc_destroy_clientid(clp, cred);
6814         if (cred)
6815                 put_rpccred(cred);
6816         switch (ret) {
6817         case 0:
6818         case -NFS4ERR_STALE_CLIENTID:
6819                 clp->cl_exchange_flags = 0;
6820         }
6821 out:
6822         return ret;
6823 }
6824
6825 struct nfs4_get_lease_time_data {
6826         struct nfs4_get_lease_time_args *args;
6827         struct nfs4_get_lease_time_res *res;
6828         struct nfs_client *clp;
6829 };
6830
6831 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6832                                         void *calldata)
6833 {
6834         struct nfs4_get_lease_time_data *data =
6835                         (struct nfs4_get_lease_time_data *)calldata;
6836
6837         dprintk("--> %s\n", __func__);
6838         /* just setup sequence, do not trigger session recovery
6839            since we're invoked within one */
6840         nfs41_setup_sequence(data->clp->cl_session,
6841                         &data->args->la_seq_args,
6842                         &data->res->lr_seq_res,
6843                         task);
6844         dprintk("<-- %s\n", __func__);
6845 }
6846
6847 /*
6848  * Called from nfs4_state_manager thread for session setup, so don't recover
6849  * from sequence operation or clientid errors.
6850  */
6851 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6852 {
6853         struct nfs4_get_lease_time_data *data =
6854                         (struct nfs4_get_lease_time_data *)calldata;
6855
6856         dprintk("--> %s\n", __func__);
6857         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6858                 return;
6859         switch (task->tk_status) {
6860         case -NFS4ERR_DELAY:
6861         case -NFS4ERR_GRACE:
6862                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6863                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6864                 task->tk_status = 0;
6865                 /* fall through */
6866         case -NFS4ERR_RETRY_UNCACHED_REP:
6867                 rpc_restart_call_prepare(task);
6868                 return;
6869         }
6870         dprintk("<-- %s\n", __func__);
6871 }
6872
6873 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6874         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6875         .rpc_call_done = nfs4_get_lease_time_done,
6876 };
6877
6878 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6879 {
6880         struct rpc_task *task;
6881         struct nfs4_get_lease_time_args args;
6882         struct nfs4_get_lease_time_res res = {
6883                 .lr_fsinfo = fsinfo,
6884         };
6885         struct nfs4_get_lease_time_data data = {
6886                 .args = &args,
6887                 .res = &res,
6888                 .clp = clp,
6889         };
6890         struct rpc_message msg = {
6891                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6892                 .rpc_argp = &args,
6893                 .rpc_resp = &res,
6894         };
6895         struct rpc_task_setup task_setup = {
6896                 .rpc_client = clp->cl_rpcclient,
6897                 .rpc_message = &msg,
6898                 .callback_ops = &nfs4_get_lease_time_ops,
6899                 .callback_data = &data,
6900                 .flags = RPC_TASK_TIMEOUT,
6901         };
6902         int status;
6903
6904         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6905         nfs4_set_sequence_privileged(&args.la_seq_args);
6906         dprintk("--> %s\n", __func__);
6907         task = rpc_run_task(&task_setup);
6908
6909         if (IS_ERR(task))
6910                 status = PTR_ERR(task);
6911         else {
6912                 status = task->tk_status;
6913                 rpc_put_task(task);
6914         }
6915         dprintk("<-- %s return %d\n", __func__, status);
6916
6917         return status;
6918 }
6919
6920 /*
6921  * Initialize the values to be used by the client in CREATE_SESSION
6922  * If nfs4_init_session set the fore channel request and response sizes,
6923  * use them.
6924  *
6925  * Set the back channel max_resp_sz_cached to zero to force the client to
6926  * always set csa_cachethis to FALSE because the current implementation
6927  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6928  */
6929 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6930 {
6931         unsigned int max_rqst_sz, max_resp_sz;
6932
6933         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6934         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6935
6936         /* Fore channel attributes */
6937         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6938         args->fc_attrs.max_resp_sz = max_resp_sz;
6939         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6940         args->fc_attrs.max_reqs = max_session_slots;
6941
6942         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6943                 "max_ops=%u max_reqs=%u\n",
6944                 __func__,
6945                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6946                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6947
6948         /* Back channel attributes */
6949         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6950         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6951         args->bc_attrs.max_resp_sz_cached = 0;
6952         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6953         args->bc_attrs.max_reqs = 1;
6954
6955         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6956                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6957                 __func__,
6958                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6959                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6960                 args->bc_attrs.max_reqs);
6961 }
6962
6963 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6964 {
6965         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6966         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6967
6968         if (rcvd->max_resp_sz > sent->max_resp_sz)
6969                 return -EINVAL;
6970         /*
6971          * Our requested max_ops is the minimum we need; we're not
6972          * prepared to break up compounds into smaller pieces than that.
6973          * So, no point even trying to continue if the server won't
6974          * cooperate:
6975          */
6976         if (rcvd->max_ops < sent->max_ops)
6977                 return -EINVAL;
6978         if (rcvd->max_reqs == 0)
6979                 return -EINVAL;
6980         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6981                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6982         return 0;
6983 }
6984
6985 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6986 {
6987         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6988         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6989
6990         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6991                 return -EINVAL;
6992         if (rcvd->max_resp_sz < sent->max_resp_sz)
6993                 return -EINVAL;
6994         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6995                 return -EINVAL;
6996         /* These would render the backchannel useless: */
6997         if (rcvd->max_ops != sent->max_ops)
6998                 return -EINVAL;
6999         if (rcvd->max_reqs != sent->max_reqs)
7000                 return -EINVAL;
7001         return 0;
7002 }
7003
7004 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7005                                      struct nfs4_session *session)
7006 {
7007         int ret;
7008
7009         ret = nfs4_verify_fore_channel_attrs(args, session);
7010         if (ret)
7011                 return ret;
7012         return nfs4_verify_back_channel_attrs(args, session);
7013 }
7014
7015 static int _nfs4_proc_create_session(struct nfs_client *clp,
7016                 struct rpc_cred *cred)
7017 {
7018         struct nfs4_session *session = clp->cl_session;
7019         struct nfs41_create_session_args args = {
7020                 .client = clp,
7021                 .cb_program = NFS4_CALLBACK,
7022         };
7023         struct nfs41_create_session_res res = {
7024                 .client = clp,
7025         };
7026         struct rpc_message msg = {
7027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7028                 .rpc_argp = &args,
7029                 .rpc_resp = &res,
7030                 .rpc_cred = cred,
7031         };
7032         int status;
7033
7034         nfs4_init_channel_attrs(&args);
7035         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7036
7037         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7038         trace_nfs4_create_session(clp, status);
7039
7040         if (!status) {
7041                 /* Verify the session's negotiated channel_attrs values */
7042                 status = nfs4_verify_channel_attrs(&args, session);
7043                 /* Increment the clientid slot sequence id */
7044                 clp->cl_seqid++;
7045         }
7046
7047         return status;
7048 }
7049
7050 /*
7051  * Issues a CREATE_SESSION operation to the server.
7052  * It is the responsibility of the caller to verify the session is
7053  * expired before calling this routine.
7054  */
7055 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7056 {
7057         int status;
7058         unsigned *ptr;
7059         struct nfs4_session *session = clp->cl_session;
7060
7061         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7062
7063         status = _nfs4_proc_create_session(clp, cred);
7064         if (status)
7065                 goto out;
7066
7067         /* Init or reset the session slot tables */
7068         status = nfs4_setup_session_slot_tables(session);
7069         dprintk("slot table setup returned %d\n", status);
7070         if (status)
7071                 goto out;
7072
7073         ptr = (unsigned *)&session->sess_id.data[0];
7074         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7075                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7076 out:
7077         dprintk("<-- %s\n", __func__);
7078         return status;
7079 }
7080
7081 /*
7082  * Issue the over-the-wire RPC DESTROY_SESSION.
7083  * The caller must serialize access to this routine.
7084  */
7085 int nfs4_proc_destroy_session(struct nfs4_session *session,
7086                 struct rpc_cred *cred)
7087 {
7088         struct rpc_message msg = {
7089                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7090                 .rpc_argp = session,
7091                 .rpc_cred = cred,
7092         };
7093         int status = 0;
7094
7095         dprintk("--> nfs4_proc_destroy_session\n");
7096
7097         /* session is still being setup */
7098         if (session->clp->cl_cons_state != NFS_CS_READY)
7099                 return status;
7100
7101         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7102         trace_nfs4_destroy_session(session->clp, status);
7103
7104         if (status)
7105                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7106                         "Session has been destroyed regardless...\n", status);
7107
7108         dprintk("<-- nfs4_proc_destroy_session\n");
7109         return status;
7110 }
7111
7112 /*
7113  * Renew the cl_session lease.
7114  */
7115 struct nfs4_sequence_data {
7116         struct nfs_client *clp;
7117         struct nfs4_sequence_args args;
7118         struct nfs4_sequence_res res;
7119 };
7120
7121 static void nfs41_sequence_release(void *data)
7122 {
7123         struct nfs4_sequence_data *calldata = data;
7124         struct nfs_client *clp = calldata->clp;
7125
7126         if (atomic_read(&clp->cl_count) > 1)
7127                 nfs4_schedule_state_renewal(clp);
7128         nfs_put_client(clp);
7129         kfree(calldata);
7130 }
7131
7132 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7133 {
7134         switch(task->tk_status) {
7135         case -NFS4ERR_DELAY:
7136                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7137                 return -EAGAIN;
7138         default:
7139                 nfs4_schedule_lease_recovery(clp);
7140         }
7141         return 0;
7142 }
7143
7144 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7145 {
7146         struct nfs4_sequence_data *calldata = data;
7147         struct nfs_client *clp = calldata->clp;
7148
7149         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7150                 return;
7151
7152         trace_nfs4_sequence(clp, task->tk_status);
7153         if (task->tk_status < 0) {
7154                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7155                 if (atomic_read(&clp->cl_count) == 1)
7156                         goto out;
7157
7158                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7159                         rpc_restart_call_prepare(task);
7160                         return;
7161                 }
7162         }
7163         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7164 out:
7165         dprintk("<-- %s\n", __func__);
7166 }
7167
7168 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7169 {
7170         struct nfs4_sequence_data *calldata = data;
7171         struct nfs_client *clp = calldata->clp;
7172         struct nfs4_sequence_args *args;
7173         struct nfs4_sequence_res *res;
7174
7175         args = task->tk_msg.rpc_argp;
7176         res = task->tk_msg.rpc_resp;
7177
7178         nfs41_setup_sequence(clp->cl_session, args, res, task);
7179 }
7180
7181 static const struct rpc_call_ops nfs41_sequence_ops = {
7182         .rpc_call_done = nfs41_sequence_call_done,
7183         .rpc_call_prepare = nfs41_sequence_prepare,
7184         .rpc_release = nfs41_sequence_release,
7185 };
7186
7187 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7188                 struct rpc_cred *cred,
7189                 bool is_privileged)
7190 {
7191         struct nfs4_sequence_data *calldata;
7192         struct rpc_message msg = {
7193                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7194                 .rpc_cred = cred,
7195         };
7196         struct rpc_task_setup task_setup_data = {
7197                 .rpc_client = clp->cl_rpcclient,
7198                 .rpc_message = &msg,
7199                 .callback_ops = &nfs41_sequence_ops,
7200                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7201         };
7202
7203         if (!atomic_inc_not_zero(&clp->cl_count))
7204                 return ERR_PTR(-EIO);
7205         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7206         if (calldata == NULL) {
7207                 nfs_put_client(clp);
7208                 return ERR_PTR(-ENOMEM);
7209         }
7210         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7211         if (is_privileged)
7212                 nfs4_set_sequence_privileged(&calldata->args);
7213         msg.rpc_argp = &calldata->args;
7214         msg.rpc_resp = &calldata->res;
7215         calldata->clp = clp;
7216         task_setup_data.callback_data = calldata;
7217
7218         return rpc_run_task(&task_setup_data);
7219 }
7220
7221 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7222 {
7223         struct rpc_task *task;
7224         int ret = 0;
7225
7226         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7227                 return 0;
7228         task = _nfs41_proc_sequence(clp, cred, false);
7229         if (IS_ERR(task))
7230                 ret = PTR_ERR(task);
7231         else
7232                 rpc_put_task_async(task);
7233         dprintk("<-- %s status=%d\n", __func__, ret);
7234         return ret;
7235 }
7236
7237 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7238 {
7239         struct rpc_task *task;
7240         int ret;
7241
7242         task = _nfs41_proc_sequence(clp, cred, true);
7243         if (IS_ERR(task)) {
7244                 ret = PTR_ERR(task);
7245                 goto out;
7246         }
7247         ret = rpc_wait_for_completion_task(task);
7248         if (!ret) {
7249                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7250
7251                 if (task->tk_status == 0)
7252                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7253                 ret = task->tk_status;
7254         }
7255         rpc_put_task(task);
7256 out:
7257         dprintk("<-- %s status=%d\n", __func__, ret);
7258         return ret;
7259 }
7260
7261 struct nfs4_reclaim_complete_data {
7262         struct nfs_client *clp;
7263         struct nfs41_reclaim_complete_args arg;
7264         struct nfs41_reclaim_complete_res res;
7265 };
7266
7267 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7268 {
7269         struct nfs4_reclaim_complete_data *calldata = data;
7270
7271         nfs41_setup_sequence(calldata->clp->cl_session,
7272                         &calldata->arg.seq_args,
7273                         &calldata->res.seq_res,
7274                         task);
7275 }
7276
7277 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7278 {
7279         switch(task->tk_status) {
7280         case 0:
7281         case -NFS4ERR_COMPLETE_ALREADY:
7282         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7283                 break;
7284         case -NFS4ERR_DELAY:
7285                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7286                 /* fall through */
7287         case -NFS4ERR_RETRY_UNCACHED_REP:
7288                 return -EAGAIN;
7289         default:
7290                 nfs4_schedule_lease_recovery(clp);
7291         }
7292         return 0;
7293 }
7294
7295 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7296 {
7297         struct nfs4_reclaim_complete_data *calldata = data;
7298         struct nfs_client *clp = calldata->clp;
7299         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7300
7301         dprintk("--> %s\n", __func__);
7302         if (!nfs41_sequence_done(task, res))
7303                 return;
7304
7305         trace_nfs4_reclaim_complete(clp, task->tk_status);
7306         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7307                 rpc_restart_call_prepare(task);
7308                 return;
7309         }
7310         dprintk("<-- %s\n", __func__);
7311 }
7312
7313 static void nfs4_free_reclaim_complete_data(void *data)
7314 {
7315         struct nfs4_reclaim_complete_data *calldata = data;
7316
7317         kfree(calldata);
7318 }
7319
7320 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7321         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7322         .rpc_call_done = nfs4_reclaim_complete_done,
7323         .rpc_release = nfs4_free_reclaim_complete_data,
7324 };
7325
7326 /*
7327  * Issue a global reclaim complete.
7328  */
7329 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7330                 struct rpc_cred *cred)
7331 {
7332         struct nfs4_reclaim_complete_data *calldata;
7333         struct rpc_task *task;
7334         struct rpc_message msg = {
7335                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7336                 .rpc_cred = cred,
7337         };
7338         struct rpc_task_setup task_setup_data = {
7339                 .rpc_client = clp->cl_rpcclient,
7340                 .rpc_message = &msg,
7341                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7342                 .flags = RPC_TASK_ASYNC,
7343         };
7344         int status = -ENOMEM;
7345
7346         dprintk("--> %s\n", __func__);
7347         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7348         if (calldata == NULL)
7349                 goto out;
7350         calldata->clp = clp;
7351         calldata->arg.one_fs = 0;
7352
7353         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7354         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7355         msg.rpc_argp = &calldata->arg;
7356         msg.rpc_resp = &calldata->res;
7357         task_setup_data.callback_data = calldata;
7358         task = rpc_run_task(&task_setup_data);
7359         if (IS_ERR(task)) {
7360                 status = PTR_ERR(task);
7361                 goto out;
7362         }
7363         status = nfs4_wait_for_completion_rpc_task(task);
7364         if (status == 0)
7365                 status = task->tk_status;
7366         rpc_put_task(task);
7367         return 0;
7368 out:
7369         dprintk("<-- %s status=%d\n", __func__, status);
7370         return status;
7371 }
7372
7373 static void
7374 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7375 {
7376         struct nfs4_layoutget *lgp = calldata;
7377         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7378         struct nfs4_session *session = nfs4_get_session(server);
7379
7380         dprintk("--> %s\n", __func__);
7381         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7382          * right now covering the LAYOUTGET we are about to send.
7383          * However, that is not so catastrophic, and there seems
7384          * to be no way to prevent it completely.
7385          */
7386         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7387                                 &lgp->res.seq_res, task))
7388                 return;
7389         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7390                                           NFS_I(lgp->args.inode)->layout,
7391                                           lgp->args.ctx->state)) {
7392                 rpc_exit(task, NFS4_OK);
7393         }
7394 }
7395
7396 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7397 {
7398         struct nfs4_layoutget *lgp = calldata;
7399         struct inode *inode = lgp->args.inode;
7400         struct nfs_server *server = NFS_SERVER(inode);
7401         struct pnfs_layout_hdr *lo;
7402         struct nfs4_state *state = NULL;
7403         unsigned long timeo, giveup;
7404
7405         dprintk("--> %s\n", __func__);
7406
7407         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7408                 goto out;
7409
7410         switch (task->tk_status) {
7411         case 0:
7412                 goto out;
7413         case -NFS4ERR_LAYOUTTRYLATER:
7414         case -NFS4ERR_RECALLCONFLICT:
7415                 timeo = rpc_get_timeout(task->tk_client);
7416                 giveup = lgp->args.timestamp + timeo;
7417                 if (time_after(giveup, jiffies))
7418                         task->tk_status = -NFS4ERR_DELAY;
7419                 break;
7420         case -NFS4ERR_EXPIRED:
7421         case -NFS4ERR_BAD_STATEID:
7422                 spin_lock(&inode->i_lock);
7423                 lo = NFS_I(inode)->layout;
7424                 if (!lo || list_empty(&lo->plh_segs)) {
7425                         spin_unlock(&inode->i_lock);
7426                         /* If the open stateid was bad, then recover it. */
7427                         state = lgp->args.ctx->state;
7428                 } else {
7429                         LIST_HEAD(head);
7430
7431                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7432                         spin_unlock(&inode->i_lock);
7433                         /* Mark the bad layout state as invalid, then
7434                          * retry using the open stateid. */
7435                         pnfs_free_lseg_list(&head);
7436                 }
7437         }
7438         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7439                 rpc_restart_call_prepare(task);
7440 out:
7441         dprintk("<-- %s\n", __func__);
7442 }
7443
7444 static size_t max_response_pages(struct nfs_server *server)
7445 {
7446         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7447         return nfs_page_array_len(0, max_resp_sz);
7448 }
7449
7450 static void nfs4_free_pages(struct page **pages, size_t size)
7451 {
7452         int i;
7453
7454         if (!pages)
7455                 return;
7456
7457         for (i = 0; i < size; i++) {
7458                 if (!pages[i])
7459                         break;
7460                 __free_page(pages[i]);
7461         }
7462         kfree(pages);
7463 }
7464
7465 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7466 {
7467         struct page **pages;
7468         int i;
7469
7470         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7471         if (!pages) {
7472                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7473                 return NULL;
7474         }
7475
7476         for (i = 0; i < size; i++) {
7477                 pages[i] = alloc_page(gfp_flags);
7478                 if (!pages[i]) {
7479                         dprintk("%s: failed to allocate page\n", __func__);
7480                         nfs4_free_pages(pages, size);
7481                         return NULL;
7482                 }
7483         }
7484
7485         return pages;
7486 }
7487
7488 static void nfs4_layoutget_release(void *calldata)
7489 {
7490         struct nfs4_layoutget *lgp = calldata;
7491         struct inode *inode = lgp->args.inode;
7492         struct nfs_server *server = NFS_SERVER(inode);
7493         size_t max_pages = max_response_pages(server);
7494
7495         dprintk("--> %s\n", __func__);
7496         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7497         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7498         put_nfs_open_context(lgp->args.ctx);
7499         kfree(calldata);
7500         dprintk("<-- %s\n", __func__);
7501 }
7502
7503 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7504         .rpc_call_prepare = nfs4_layoutget_prepare,
7505         .rpc_call_done = nfs4_layoutget_done,
7506         .rpc_release = nfs4_layoutget_release,
7507 };
7508
7509 struct pnfs_layout_segment *
7510 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7511 {
7512         struct inode *inode = lgp->args.inode;
7513         struct nfs_server *server = NFS_SERVER(inode);
7514         size_t max_pages = max_response_pages(server);
7515         struct rpc_task *task;
7516         struct rpc_message msg = {
7517                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7518                 .rpc_argp = &lgp->args,
7519                 .rpc_resp = &lgp->res,
7520                 .rpc_cred = lgp->cred,
7521         };
7522         struct rpc_task_setup task_setup_data = {
7523                 .rpc_client = server->client,
7524                 .rpc_message = &msg,
7525                 .callback_ops = &nfs4_layoutget_call_ops,
7526                 .callback_data = lgp,
7527                 .flags = RPC_TASK_ASYNC,
7528         };
7529         struct pnfs_layout_segment *lseg = NULL;
7530         int status = 0;
7531
7532         dprintk("--> %s\n", __func__);
7533
7534         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7535         if (!lgp->args.layout.pages) {
7536                 nfs4_layoutget_release(lgp);
7537                 return ERR_PTR(-ENOMEM);
7538         }
7539         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7540         lgp->args.timestamp = jiffies;
7541
7542         lgp->res.layoutp = &lgp->args.layout;
7543         lgp->res.seq_res.sr_slot = NULL;
7544         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7545
7546         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7547         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7548
7549         task = rpc_run_task(&task_setup_data);
7550         if (IS_ERR(task))
7551                 return ERR_CAST(task);
7552         status = nfs4_wait_for_completion_rpc_task(task);
7553         if (status == 0)
7554                 status = task->tk_status;
7555         trace_nfs4_layoutget(lgp->args.ctx,
7556                         &lgp->args.range,
7557                         &lgp->res.range,
7558                         status);
7559         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7560         if (status == 0 && lgp->res.layoutp->len)
7561                 lseg = pnfs_layout_process(lgp);
7562         rpc_put_task(task);
7563         dprintk("<-- %s status=%d\n", __func__, status);
7564         if (status)
7565                 return ERR_PTR(status);
7566         return lseg;
7567 }
7568
7569 static void
7570 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7571 {
7572         struct nfs4_layoutreturn *lrp = calldata;
7573
7574         dprintk("--> %s\n", __func__);
7575         nfs41_setup_sequence(lrp->clp->cl_session,
7576                         &lrp->args.seq_args,
7577                         &lrp->res.seq_res,
7578                         task);
7579 }
7580
7581 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7582 {
7583         struct nfs4_layoutreturn *lrp = calldata;
7584         struct nfs_server *server;
7585
7586         dprintk("--> %s\n", __func__);
7587
7588         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7589                 return;
7590
7591         server = NFS_SERVER(lrp->args.inode);
7592         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7593                 rpc_restart_call_prepare(task);
7594                 return;
7595         }
7596         dprintk("<-- %s\n", __func__);
7597 }
7598
7599 static void nfs4_layoutreturn_release(void *calldata)
7600 {
7601         struct nfs4_layoutreturn *lrp = calldata;
7602         struct pnfs_layout_hdr *lo = lrp->args.layout;
7603
7604         dprintk("--> %s\n", __func__);
7605         spin_lock(&lo->plh_inode->i_lock);
7606         if (lrp->res.lrs_present)
7607                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7608         lo->plh_block_lgets--;
7609         spin_unlock(&lo->plh_inode->i_lock);
7610         pnfs_put_layout_hdr(lrp->args.layout);
7611         kfree(calldata);
7612         dprintk("<-- %s\n", __func__);
7613 }
7614
7615 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7616         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7617         .rpc_call_done = nfs4_layoutreturn_done,
7618         .rpc_release = nfs4_layoutreturn_release,
7619 };
7620
7621 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7622 {
7623         struct rpc_task *task;
7624         struct rpc_message msg = {
7625                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7626                 .rpc_argp = &lrp->args,
7627                 .rpc_resp = &lrp->res,
7628                 .rpc_cred = lrp->cred,
7629         };
7630         struct rpc_task_setup task_setup_data = {
7631                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7632                 .rpc_message = &msg,
7633                 .callback_ops = &nfs4_layoutreturn_call_ops,
7634                 .callback_data = lrp,
7635         };
7636         int status;
7637
7638         dprintk("--> %s\n", __func__);
7639         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7640         task = rpc_run_task(&task_setup_data);
7641         if (IS_ERR(task))
7642                 return PTR_ERR(task);
7643         status = task->tk_status;
7644         trace_nfs4_layoutreturn(lrp->args.inode, status);
7645         dprintk("<-- %s status=%d\n", __func__, status);
7646         rpc_put_task(task);
7647         return status;
7648 }
7649
7650 /*
7651  * Retrieve the list of Data Server devices from the MDS.
7652  */
7653 static int _nfs4_getdevicelist(struct nfs_server *server,
7654                                     const struct nfs_fh *fh,
7655                                     struct pnfs_devicelist *devlist)
7656 {
7657         struct nfs4_getdevicelist_args args = {
7658                 .fh = fh,
7659                 .layoutclass = server->pnfs_curr_ld->id,
7660         };
7661         struct nfs4_getdevicelist_res res = {
7662                 .devlist = devlist,
7663         };
7664         struct rpc_message msg = {
7665                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7666                 .rpc_argp = &args,
7667                 .rpc_resp = &res,
7668         };
7669         int status;
7670
7671         dprintk("--> %s\n", __func__);
7672         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7673                                 &res.seq_res, 0);
7674         dprintk("<-- %s status=%d\n", __func__, status);
7675         return status;
7676 }
7677
7678 int nfs4_proc_getdevicelist(struct nfs_server *server,
7679                             const struct nfs_fh *fh,
7680                             struct pnfs_devicelist *devlist)
7681 {
7682         struct nfs4_exception exception = { };
7683         int err;
7684
7685         do {
7686                 err = nfs4_handle_exception(server,
7687                                 _nfs4_getdevicelist(server, fh, devlist),
7688                                 &exception);
7689         } while (exception.retry);
7690
7691         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7692                 err, devlist->num_devs);
7693
7694         return err;
7695 }
7696 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7697
7698 static int
7699 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7700                 struct pnfs_device *pdev,
7701                 struct rpc_cred *cred)
7702 {
7703         struct nfs4_getdeviceinfo_args args = {
7704                 .pdev = pdev,
7705         };
7706         struct nfs4_getdeviceinfo_res res = {
7707                 .pdev = pdev,
7708         };
7709         struct rpc_message msg = {
7710                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7711                 .rpc_argp = &args,
7712                 .rpc_resp = &res,
7713                 .rpc_cred = cred,
7714         };
7715         int status;
7716
7717         dprintk("--> %s\n", __func__);
7718         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7719         dprintk("<-- %s status=%d\n", __func__, status);
7720
7721         return status;
7722 }
7723
7724 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7725                 struct pnfs_device *pdev,
7726                 struct rpc_cred *cred)
7727 {
7728         struct nfs4_exception exception = { };
7729         int err;
7730
7731         do {
7732                 err = nfs4_handle_exception(server,
7733                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7734                                         &exception);
7735         } while (exception.retry);
7736         return err;
7737 }
7738 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7739
7740 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7741 {
7742         struct nfs4_layoutcommit_data *data = calldata;
7743         struct nfs_server *server = NFS_SERVER(data->args.inode);
7744         struct nfs4_session *session = nfs4_get_session(server);
7745
7746         nfs41_setup_sequence(session,
7747                         &data->args.seq_args,
7748                         &data->res.seq_res,
7749                         task);
7750 }
7751
7752 static void
7753 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7754 {
7755         struct nfs4_layoutcommit_data *data = calldata;
7756         struct nfs_server *server = NFS_SERVER(data->args.inode);
7757
7758         if (!nfs41_sequence_done(task, &data->res.seq_res))
7759                 return;
7760
7761         switch (task->tk_status) { /* Just ignore these failures */
7762         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7763         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7764         case -NFS4ERR_BADLAYOUT:     /* no layout */
7765         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7766                 task->tk_status = 0;
7767                 break;
7768         case 0:
7769                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7770                                                    data->res.fattr);
7771                 break;
7772         default:
7773                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7774                         rpc_restart_call_prepare(task);
7775                         return;
7776                 }
7777         }
7778 }
7779
7780 static void nfs4_layoutcommit_release(void *calldata)
7781 {
7782         struct nfs4_layoutcommit_data *data = calldata;
7783
7784         pnfs_cleanup_layoutcommit(data);
7785         put_rpccred(data->cred);
7786         kfree(data);
7787 }
7788
7789 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7790         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7791         .rpc_call_done = nfs4_layoutcommit_done,
7792         .rpc_release = nfs4_layoutcommit_release,
7793 };
7794
7795 int
7796 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7797 {
7798         struct rpc_message msg = {
7799                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7800                 .rpc_argp = &data->args,
7801                 .rpc_resp = &data->res,
7802                 .rpc_cred = data->cred,
7803         };
7804         struct rpc_task_setup task_setup_data = {
7805                 .task = &data->task,
7806                 .rpc_client = NFS_CLIENT(data->args.inode),
7807                 .rpc_message = &msg,
7808                 .callback_ops = &nfs4_layoutcommit_ops,
7809                 .callback_data = data,
7810                 .flags = RPC_TASK_ASYNC,
7811         };
7812         struct rpc_task *task;
7813         int status = 0;
7814
7815         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7816                 "lbw: %llu inode %lu\n",
7817                 data->task.tk_pid, sync,
7818                 data->args.lastbytewritten,
7819                 data->args.inode->i_ino);
7820
7821         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7822         task = rpc_run_task(&task_setup_data);
7823         if (IS_ERR(task))
7824                 return PTR_ERR(task);
7825         if (sync == false)
7826                 goto out;
7827         status = nfs4_wait_for_completion_rpc_task(task);
7828         if (status != 0)
7829                 goto out;
7830         status = task->tk_status;
7831         trace_nfs4_layoutcommit(data->args.inode, status);
7832 out:
7833         dprintk("%s: status %d\n", __func__, status);
7834         rpc_put_task(task);
7835         return status;
7836 }
7837
7838 /**
7839  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7840  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7841  */
7842 static int
7843 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7844                     struct nfs_fsinfo *info,
7845                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7846 {
7847         struct nfs41_secinfo_no_name_args args = {
7848                 .style = SECINFO_STYLE_CURRENT_FH,
7849         };
7850         struct nfs4_secinfo_res res = {
7851                 .flavors = flavors,
7852         };
7853         struct rpc_message msg = {
7854                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7855                 .rpc_argp = &args,
7856                 .rpc_resp = &res,
7857         };
7858         struct rpc_clnt *clnt = server->client;
7859         struct rpc_cred *cred = NULL;
7860         int status;
7861
7862         if (use_integrity) {
7863                 clnt = server->nfs_client->cl_rpcclient;
7864                 cred = nfs4_get_clid_cred(server->nfs_client);
7865                 msg.rpc_cred = cred;
7866         }
7867
7868         dprintk("--> %s\n", __func__);
7869         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7870                                 &res.seq_res, 0);
7871         dprintk("<-- %s status=%d\n", __func__, status);
7872
7873         if (cred)
7874                 put_rpccred(cred);
7875
7876         return status;
7877 }
7878
7879 static int
7880 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7881                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7882 {
7883         struct nfs4_exception exception = { };
7884         int err;
7885         do {
7886                 /* first try using integrity protection */
7887                 err = -NFS4ERR_WRONGSEC;
7888
7889                 /* try to use integrity protection with machine cred */
7890                 if (_nfs4_is_integrity_protected(server->nfs_client))
7891                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7892                                                           flavors, true);
7893
7894                 /*
7895                  * if unable to use integrity protection, or SECINFO with
7896                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7897                  * disallowed by spec, but exists in deployed servers) use
7898                  * the current filesystem's rpc_client and the user cred.
7899                  */
7900                 if (err == -NFS4ERR_WRONGSEC)
7901                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7902                                                           flavors, false);
7903
7904                 switch (err) {
7905                 case 0:
7906                 case -NFS4ERR_WRONGSEC:
7907                 case -NFS4ERR_NOTSUPP:
7908                         goto out;
7909                 default:
7910                         err = nfs4_handle_exception(server, err, &exception);
7911                 }
7912         } while (exception.retry);
7913 out:
7914         return err;
7915 }
7916
7917 static int
7918 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7919                     struct nfs_fsinfo *info)
7920 {
7921         int err;
7922         struct page *page;
7923         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
7924         struct nfs4_secinfo_flavors *flavors;
7925         struct nfs4_secinfo4 *secinfo;
7926         int i;
7927
7928         page = alloc_page(GFP_KERNEL);
7929         if (!page) {
7930                 err = -ENOMEM;
7931                 goto out;
7932         }
7933
7934         flavors = page_address(page);
7935         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7936
7937         /*
7938          * Fall back on "guess and check" method if
7939          * the server doesn't support SECINFO_NO_NAME
7940          */
7941         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7942                 err = nfs4_find_root_sec(server, fhandle, info);
7943                 goto out_freepage;
7944         }
7945         if (err)
7946                 goto out_freepage;
7947
7948         for (i = 0; i < flavors->num_flavors; i++) {
7949                 secinfo = &flavors->flavors[i];
7950
7951                 switch (secinfo->flavor) {
7952                 case RPC_AUTH_NULL:
7953                 case RPC_AUTH_UNIX:
7954                 case RPC_AUTH_GSS:
7955                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
7956                                         &secinfo->flavor_info);
7957                         break;
7958                 default:
7959                         flavor = RPC_AUTH_MAXFLAVOR;
7960                         break;
7961                 }
7962
7963                 if (!nfs_auth_info_match(&server->auth_info, flavor))
7964                         flavor = RPC_AUTH_MAXFLAVOR;
7965
7966                 if (flavor != RPC_AUTH_MAXFLAVOR) {
7967                         err = nfs4_lookup_root_sec(server, fhandle,
7968                                                    info, flavor);
7969                         if (!err)
7970                                 break;
7971                 }
7972         }
7973
7974         if (flavor == RPC_AUTH_MAXFLAVOR)
7975                 err = -EPERM;
7976
7977 out_freepage:
7978         put_page(page);
7979         if (err == -EACCES)
7980                 return -EPERM;
7981 out:
7982         return err;
7983 }
7984
7985 static int _nfs41_test_stateid(struct nfs_server *server,
7986                 nfs4_stateid *stateid,
7987                 struct rpc_cred *cred)
7988 {
7989         int status;
7990         struct nfs41_test_stateid_args args = {
7991                 .stateid = stateid,
7992         };
7993         struct nfs41_test_stateid_res res;
7994         struct rpc_message msg = {
7995                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7996                 .rpc_argp = &args,
7997                 .rpc_resp = &res,
7998                 .rpc_cred = cred,
7999         };
8000         struct rpc_clnt *rpc_client = server->client;
8001
8002         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8003                 &rpc_client, &msg);
8004
8005         dprintk("NFS call  test_stateid %p\n", stateid);
8006         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8007         nfs4_set_sequence_privileged(&args.seq_args);
8008         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8009                         &args.seq_args, &res.seq_res);
8010         if (status != NFS_OK) {
8011                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8012                 return status;
8013         }
8014         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8015         return -res.status;
8016 }
8017
8018 /**
8019  * nfs41_test_stateid - perform a TEST_STATEID operation
8020  *
8021  * @server: server / transport on which to perform the operation
8022  * @stateid: state ID to test
8023  * @cred: credential
8024  *
8025  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8026  * Otherwise a negative NFS4ERR value is returned if the operation
8027  * failed or the state ID is not currently valid.
8028  */
8029 static int nfs41_test_stateid(struct nfs_server *server,
8030                 nfs4_stateid *stateid,
8031                 struct rpc_cred *cred)
8032 {
8033         struct nfs4_exception exception = { };
8034         int err;
8035         do {
8036                 err = _nfs41_test_stateid(server, stateid, cred);
8037                 if (err != -NFS4ERR_DELAY)
8038                         break;
8039                 nfs4_handle_exception(server, err, &exception);
8040         } while (exception.retry);
8041         return err;
8042 }
8043
8044 struct nfs_free_stateid_data {
8045         struct nfs_server *server;
8046         struct nfs41_free_stateid_args args;
8047         struct nfs41_free_stateid_res res;
8048 };
8049
8050 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8051 {
8052         struct nfs_free_stateid_data *data = calldata;
8053         nfs41_setup_sequence(nfs4_get_session(data->server),
8054                         &data->args.seq_args,
8055                         &data->res.seq_res,
8056                         task);
8057 }
8058
8059 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8060 {
8061         struct nfs_free_stateid_data *data = calldata;
8062
8063         nfs41_sequence_done(task, &data->res.seq_res);
8064
8065         switch (task->tk_status) {
8066         case -NFS4ERR_DELAY:
8067                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
8068                         rpc_restart_call_prepare(task);
8069         }
8070 }
8071
8072 static void nfs41_free_stateid_release(void *calldata)
8073 {
8074         kfree(calldata);
8075 }
8076
8077 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8078         .rpc_call_prepare = nfs41_free_stateid_prepare,
8079         .rpc_call_done = nfs41_free_stateid_done,
8080         .rpc_release = nfs41_free_stateid_release,
8081 };
8082
8083 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8084                 nfs4_stateid *stateid,
8085                 struct rpc_cred *cred,
8086                 bool privileged)
8087 {
8088         struct rpc_message msg = {
8089                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8090                 .rpc_cred = cred,
8091         };
8092         struct rpc_task_setup task_setup = {
8093                 .rpc_client = server->client,
8094                 .rpc_message = &msg,
8095                 .callback_ops = &nfs41_free_stateid_ops,
8096                 .flags = RPC_TASK_ASYNC,
8097         };
8098         struct nfs_free_stateid_data *data;
8099
8100         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8101                 &task_setup.rpc_client, &msg);
8102
8103         dprintk("NFS call  free_stateid %p\n", stateid);
8104         data = kmalloc(sizeof(*data), GFP_NOFS);
8105         if (!data)
8106                 return ERR_PTR(-ENOMEM);
8107         data->server = server;
8108         nfs4_stateid_copy(&data->args.stateid, stateid);
8109
8110         task_setup.callback_data = data;
8111
8112         msg.rpc_argp = &data->args;
8113         msg.rpc_resp = &data->res;
8114         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8115         if (privileged)
8116                 nfs4_set_sequence_privileged(&data->args.seq_args);
8117
8118         return rpc_run_task(&task_setup);
8119 }
8120
8121 /**
8122  * nfs41_free_stateid - perform a FREE_STATEID operation
8123  *
8124  * @server: server / transport on which to perform the operation
8125  * @stateid: state ID to release
8126  * @cred: credential
8127  *
8128  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8129  * negative NFS4ERR value is returned.
8130  */
8131 static int nfs41_free_stateid(struct nfs_server *server,
8132                 nfs4_stateid *stateid,
8133                 struct rpc_cred *cred)
8134 {
8135         struct rpc_task *task;
8136         int ret;
8137
8138         task = _nfs41_free_stateid(server, stateid, cred, true);
8139         if (IS_ERR(task))
8140                 return PTR_ERR(task);
8141         ret = rpc_wait_for_completion_task(task);
8142         if (!ret)
8143                 ret = task->tk_status;
8144         rpc_put_task(task);
8145         return ret;
8146 }
8147
8148 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8149 {
8150         struct rpc_task *task;
8151         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8152
8153         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8154         nfs4_free_lock_state(server, lsp);
8155         if (IS_ERR(task))
8156                 return PTR_ERR(task);
8157         rpc_put_task(task);
8158         return 0;
8159 }
8160
8161 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8162                 const nfs4_stateid *s2)
8163 {
8164         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8165                 return false;
8166
8167         if (s1->seqid == s2->seqid)
8168                 return true;
8169         if (s1->seqid == 0 || s2->seqid == 0)
8170                 return true;
8171
8172         return false;
8173 }
8174
8175 #endif /* CONFIG_NFS_V4_1 */
8176
8177 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8178                 const nfs4_stateid *s2)
8179 {
8180         return nfs4_stateid_match(s1, s2);
8181 }
8182
8183
8184 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8185         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8186         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8187         .recover_open   = nfs4_open_reclaim,
8188         .recover_lock   = nfs4_lock_reclaim,
8189         .establish_clid = nfs4_init_clientid,
8190         .detect_trunking = nfs40_discover_server_trunking,
8191 };
8192
8193 #if defined(CONFIG_NFS_V4_1)
8194 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8195         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8196         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8197         .recover_open   = nfs4_open_reclaim,
8198         .recover_lock   = nfs4_lock_reclaim,
8199         .establish_clid = nfs41_init_clientid,
8200         .reclaim_complete = nfs41_proc_reclaim_complete,
8201         .detect_trunking = nfs41_discover_server_trunking,
8202 };
8203 #endif /* CONFIG_NFS_V4_1 */
8204
8205 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8206         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8207         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8208         .recover_open   = nfs4_open_expired,
8209         .recover_lock   = nfs4_lock_expired,
8210         .establish_clid = nfs4_init_clientid,
8211 };
8212
8213 #if defined(CONFIG_NFS_V4_1)
8214 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8215         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8216         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8217         .recover_open   = nfs41_open_expired,
8218         .recover_lock   = nfs41_lock_expired,
8219         .establish_clid = nfs41_init_clientid,
8220 };
8221 #endif /* CONFIG_NFS_V4_1 */
8222
8223 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8224         .sched_state_renewal = nfs4_proc_async_renew,
8225         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8226         .renew_lease = nfs4_proc_renew,
8227 };
8228
8229 #if defined(CONFIG_NFS_V4_1)
8230 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8231         .sched_state_renewal = nfs41_proc_async_sequence,
8232         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8233         .renew_lease = nfs4_proc_sequence,
8234 };
8235 #endif
8236
8237 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8238         .get_locations = _nfs40_proc_get_locations,
8239         .fsid_present = _nfs40_proc_fsid_present,
8240 };
8241
8242 #if defined(CONFIG_NFS_V4_1)
8243 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8244         .get_locations = _nfs41_proc_get_locations,
8245         .fsid_present = _nfs41_proc_fsid_present,
8246 };
8247 #endif  /* CONFIG_NFS_V4_1 */
8248
8249 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8250         .minor_version = 0,
8251         .init_caps = NFS_CAP_READDIRPLUS
8252                 | NFS_CAP_ATOMIC_OPEN
8253                 | NFS_CAP_CHANGE_ATTR
8254                 | NFS_CAP_POSIX_LOCK,
8255         .init_client = nfs40_init_client,
8256         .shutdown_client = nfs40_shutdown_client,
8257         .match_stateid = nfs4_match_stateid,
8258         .find_root_sec = nfs4_find_root_sec,
8259         .free_lock_state = nfs4_release_lockowner,
8260         .call_sync_ops = &nfs40_call_sync_ops,
8261         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8262         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8263         .state_renewal_ops = &nfs40_state_renewal_ops,
8264         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8265 };
8266
8267 #if defined(CONFIG_NFS_V4_1)
8268 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8269         .minor_version = 1,
8270         .init_caps = NFS_CAP_READDIRPLUS
8271                 | NFS_CAP_ATOMIC_OPEN
8272                 | NFS_CAP_CHANGE_ATTR
8273                 | NFS_CAP_POSIX_LOCK
8274                 | NFS_CAP_STATEID_NFSV41
8275                 | NFS_CAP_ATOMIC_OPEN_V1,
8276         .init_client = nfs41_init_client,
8277         .shutdown_client = nfs41_shutdown_client,
8278         .match_stateid = nfs41_match_stateid,
8279         .find_root_sec = nfs41_find_root_sec,
8280         .free_lock_state = nfs41_free_lock_state,
8281         .call_sync_ops = &nfs41_call_sync_ops,
8282         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8283         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8284         .state_renewal_ops = &nfs41_state_renewal_ops,
8285         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8286 };
8287 #endif
8288
8289 #if defined(CONFIG_NFS_V4_2)
8290 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8291         .minor_version = 2,
8292         .init_caps = NFS_CAP_READDIRPLUS
8293                 | NFS_CAP_ATOMIC_OPEN
8294                 | NFS_CAP_CHANGE_ATTR
8295                 | NFS_CAP_POSIX_LOCK
8296                 | NFS_CAP_STATEID_NFSV41
8297                 | NFS_CAP_ATOMIC_OPEN_V1,
8298         .init_client = nfs41_init_client,
8299         .shutdown_client = nfs41_shutdown_client,
8300         .match_stateid = nfs41_match_stateid,
8301         .find_root_sec = nfs41_find_root_sec,
8302         .free_lock_state = nfs41_free_lock_state,
8303         .call_sync_ops = &nfs41_call_sync_ops,
8304         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8305         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8306         .state_renewal_ops = &nfs41_state_renewal_ops,
8307 };
8308 #endif
8309
8310 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8311         [0] = &nfs_v4_0_minor_ops,
8312 #if defined(CONFIG_NFS_V4_1)
8313         [1] = &nfs_v4_1_minor_ops,
8314 #endif
8315 #if defined(CONFIG_NFS_V4_2)
8316         [2] = &nfs_v4_2_minor_ops,
8317 #endif
8318 };
8319
8320 static const struct inode_operations nfs4_dir_inode_operations = {
8321         .create         = nfs_create,
8322         .lookup         = nfs_lookup,
8323         .atomic_open    = nfs_atomic_open,
8324         .link           = nfs_link,
8325         .unlink         = nfs_unlink,
8326         .symlink        = nfs_symlink,
8327         .mkdir          = nfs_mkdir,
8328         .rmdir          = nfs_rmdir,
8329         .mknod          = nfs_mknod,
8330         .rename         = nfs_rename,
8331         .permission     = nfs_permission,
8332         .getattr        = nfs_getattr,
8333         .setattr        = nfs_setattr,
8334         .getxattr       = generic_getxattr,
8335         .setxattr       = generic_setxattr,
8336         .listxattr      = generic_listxattr,
8337         .removexattr    = generic_removexattr,
8338 };
8339
8340 static const struct inode_operations nfs4_file_inode_operations = {
8341         .permission     = nfs_permission,
8342         .getattr        = nfs_getattr,
8343         .setattr        = nfs_setattr,
8344         .getxattr       = generic_getxattr,
8345         .setxattr       = generic_setxattr,
8346         .listxattr      = generic_listxattr,
8347         .removexattr    = generic_removexattr,
8348 };
8349
8350 const struct nfs_rpc_ops nfs_v4_clientops = {
8351         .version        = 4,                    /* protocol version */
8352         .dentry_ops     = &nfs4_dentry_operations,
8353         .dir_inode_ops  = &nfs4_dir_inode_operations,
8354         .file_inode_ops = &nfs4_file_inode_operations,
8355         .file_ops       = &nfs4_file_operations,
8356         .getroot        = nfs4_proc_get_root,
8357         .submount       = nfs4_submount,
8358         .try_mount      = nfs4_try_mount,
8359         .getattr        = nfs4_proc_getattr,
8360         .setattr        = nfs4_proc_setattr,
8361         .lookup         = nfs4_proc_lookup,
8362         .access         = nfs4_proc_access,
8363         .readlink       = nfs4_proc_readlink,
8364         .create         = nfs4_proc_create,
8365         .remove         = nfs4_proc_remove,
8366         .unlink_setup   = nfs4_proc_unlink_setup,
8367         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8368         .unlink_done    = nfs4_proc_unlink_done,
8369         .rename         = nfs4_proc_rename,
8370         .rename_setup   = nfs4_proc_rename_setup,
8371         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8372         .rename_done    = nfs4_proc_rename_done,
8373         .link           = nfs4_proc_link,
8374         .symlink        = nfs4_proc_symlink,
8375         .mkdir          = nfs4_proc_mkdir,
8376         .rmdir          = nfs4_proc_remove,
8377         .readdir        = nfs4_proc_readdir,
8378         .mknod          = nfs4_proc_mknod,
8379         .statfs         = nfs4_proc_statfs,
8380         .fsinfo         = nfs4_proc_fsinfo,
8381         .pathconf       = nfs4_proc_pathconf,
8382         .set_capabilities = nfs4_server_capabilities,
8383         .decode_dirent  = nfs4_decode_dirent,
8384         .read_setup     = nfs4_proc_read_setup,
8385         .read_pageio_init = pnfs_pageio_init_read,
8386         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8387         .read_done      = nfs4_read_done,
8388         .write_setup    = nfs4_proc_write_setup,
8389         .write_pageio_init = pnfs_pageio_init_write,
8390         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8391         .write_done     = nfs4_write_done,
8392         .commit_setup   = nfs4_proc_commit_setup,
8393         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8394         .commit_done    = nfs4_commit_done,
8395         .lock           = nfs4_proc_lock,
8396         .clear_acl_cache = nfs4_zap_acl_attr,
8397         .close_context  = nfs4_close_context,
8398         .open_context   = nfs4_atomic_open,
8399         .have_delegation = nfs4_have_delegation,
8400         .return_delegation = nfs4_inode_return_delegation,
8401         .alloc_client   = nfs4_alloc_client,
8402         .init_client    = nfs4_init_client,
8403         .free_client    = nfs4_free_client,
8404         .create_server  = nfs4_create_server,
8405         .clone_server   = nfs_clone_server,
8406 };
8407
8408 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8409         .prefix = XATTR_NAME_NFSV4_ACL,
8410         .list   = nfs4_xattr_list_nfs4_acl,
8411         .get    = nfs4_xattr_get_nfs4_acl,
8412         .set    = nfs4_xattr_set_nfs4_acl,
8413 };
8414
8415 const struct xattr_handler *nfs4_xattr_handlers[] = {
8416         &nfs4_xattr_nfs4_acl_handler,
8417 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8418         &nfs4_xattr_nfs4_label_handler,
8419 #endif
8420         NULL
8421 };
8422
8423 /*
8424  * Local variables:
8425  *  c-basic-offset: 8
8426  * End:
8427  */