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 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  87                 struct rpc_cred *);
  88 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  89                 struct rpc_cred *);
  90 #endif
  91 /* Prevent leaks of NFSv4 errors into userland */
  92 static int nfs4_map_errors(int err)
  93 {
  94         if (err >= -1000)
  95                 return err;
  96         switch (err) {
  97         case -NFS4ERR_RESOURCE:
  98         case -NFS4ERR_LAYOUTTRYLATER:
  99         case -NFS4ERR_RECALLCONFLICT:
 100                 return -EREMOTEIO;
 101         case -NFS4ERR_WRONGSEC:
 102                 return -EPERM;
 103         case -NFS4ERR_BADOWNER:
 104         case -NFS4ERR_BADNAME:
 105                 return -EINVAL;
 106         case -NFS4ERR_SHARE_DENIED:
 107                 return -EACCES;
 108         case -NFS4ERR_MINOR_VERS_MISMATCH:
 109                 return -EPROTONOSUPPORT;
 110         case -NFS4ERR_ACCESS:
 111                 return -EACCES;
 112         case -NFS4ERR_FILE_OPEN:
 113                 return -EBUSY;
 114         default:
 115                 dprintk("%s could not handle NFSv4 error %d\n",
 116                                 __func__, -err);
 117                 break;
 118         }
 119         return -EIO;
 120 }
 121
 122 /*
 123  * This is our standard bitmap for GETATTR requests.
 124  */
 125 const u32 nfs4_fattr_bitmap[3] = {
 126         FATTR4_WORD0_TYPE
 127         | FATTR4_WORD0_CHANGE
 128         | FATTR4_WORD0_SIZE
 129         | FATTR4_WORD0_FSID
 130         | FATTR4_WORD0_FILEID,
 131         FATTR4_WORD1_MODE
 132         | FATTR4_WORD1_NUMLINKS
 133         | FATTR4_WORD1_OWNER
 134         | FATTR4_WORD1_OWNER_GROUP
 135         | FATTR4_WORD1_RAWDEV
 136         | FATTR4_WORD1_SPACE_USED
 137         | FATTR4_WORD1_TIME_ACCESS
 138         | FATTR4_WORD1_TIME_METADATA
 139         | FATTR4_WORD1_TIME_MODIFY
 140 };
 141
 142 static const u32 nfs4_pnfs_open_bitmap[3] = {
 143         FATTR4_WORD0_TYPE
 144         | FATTR4_WORD0_CHANGE
 145         | FATTR4_WORD0_SIZE
 146         | FATTR4_WORD0_FSID
 147         | FATTR4_WORD0_FILEID,
 148         FATTR4_WORD1_MODE
 149         | FATTR4_WORD1_NUMLINKS
 150         | FATTR4_WORD1_OWNER
 151         | FATTR4_WORD1_OWNER_GROUP
 152         | FATTR4_WORD1_RAWDEV
 153         | FATTR4_WORD1_SPACE_USED
 154         | FATTR4_WORD1_TIME_ACCESS
 155         | FATTR4_WORD1_TIME_METADATA
 156         | FATTR4_WORD1_TIME_MODIFY,
 157         FATTR4_WORD2_MDSTHRESHOLD
 158 };
 159
 160 static const u32 nfs4_open_noattr_bitmap[3] = {
 161         FATTR4_WORD0_TYPE
 162         | FATTR4_WORD0_CHANGE
 163         | FATTR4_WORD0_FILEID,
 164 };
 165
 166 const u32 nfs4_statfs_bitmap[2] = {
 167         FATTR4_WORD0_FILES_AVAIL
 168         | FATTR4_WORD0_FILES_FREE
 169         | FATTR4_WORD0_FILES_TOTAL,
 170         FATTR4_WORD1_SPACE_AVAIL
 171         | FATTR4_WORD1_SPACE_FREE
 172         | FATTR4_WORD1_SPACE_TOTAL
 173 };
 174
 175 const u32 nfs4_pathconf_bitmap[2] = {
 176         FATTR4_WORD0_MAXLINK
 177         | FATTR4_WORD0_MAXNAME,
 178         0
 179 };
 180
 181 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 182                         | FATTR4_WORD0_MAXREAD
 183                         | FATTR4_WORD0_MAXWRITE
 184                         | FATTR4_WORD0_LEASE_TIME,
 185                         FATTR4_WORD1_TIME_DELTA
 186                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 187                         FATTR4_WORD2_LAYOUT_BLKSIZE
 188 };
 189
 190 const u32 nfs4_fs_locations_bitmap[2] = {
 191         FATTR4_WORD0_TYPE
 192         | FATTR4_WORD0_CHANGE
 193         | FATTR4_WORD0_SIZE
 194         | FATTR4_WORD0_FSID
 195         | FATTR4_WORD0_FILEID
 196         | FATTR4_WORD0_FS_LOCATIONS,
 197         FATTR4_WORD1_MODE
 198         | FATTR4_WORD1_NUMLINKS
 199         | FATTR4_WORD1_OWNER
 200         | FATTR4_WORD1_OWNER_GROUP
 201         | FATTR4_WORD1_RAWDEV
 202         | FATTR4_WORD1_SPACE_USED
 203         | FATTR4_WORD1_TIME_ACCESS
 204         | FATTR4_WORD1_TIME_METADATA
 205         | FATTR4_WORD1_TIME_MODIFY
 206         | FATTR4_WORD1_MOUNTED_ON_FILEID
 207 };
 208
 209 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 210                 struct nfs4_readdir_arg *readdir)
 211 {
 212         __be32 *start, *p;
 213
 214         if (cookie > 2) {
 215                 readdir->cookie = cookie;
 216                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 217                 return;
 218         }
 219
 220         readdir->cookie = 0;
 221         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 222         if (cookie == 2)
 223                 return;
 224
 225         /*
 226          * NFSv4 servers do not return entries for '.' and '..'
 227          * Therefore, we fake these entries here.  We let '.'
 228          * have cookie 0 and '..' have cookie 1.  Note that
 229          * when talking to the server, we always send cookie 0
 230          * instead of 1 or 2.
 231          */
 232         start = p = kmap_atomic(*readdir->pages);
 233
 234         if (cookie == 0) {
 235                 *p++ = xdr_one;                                  /* next */
 236                 *p++ = xdr_zero;                   /* cookie, first word */
 237                 *p++ = xdr_one;                   /* cookie, second word */
 238                 *p++ = xdr_one;                             /* entry len */
 239                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 240                 p++;
 241                 *p++ = xdr_one;                         /* bitmap length */
 242                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 243                 *p++ = htonl(8);              /* attribute buffer length */
 244                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 245         }
 246
 247         *p++ = xdr_one;                                  /* next */
 248         *p++ = xdr_zero;                   /* cookie, first word */
 249         *p++ = xdr_two;                   /* cookie, second word */
 250         *p++ = xdr_two;                             /* entry len */
 251         memcpy(p, "..\0\0", 4);                         /* entry */
 252         p++;
 253         *p++ = xdr_one;                         /* bitmap length */
 254         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 255         *p++ = htonl(8);              /* attribute buffer length */
 256         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 257
 258         readdir->pgbase = (char *)p - (char *)start;
 259         readdir->count -= readdir->pgbase;
 260         kunmap_atomic(start);
 261 }
 262
 263 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 264 {
 265         int res = 0;
 266
 267         might_sleep();
 268
 269         if (*timeout <= 0)
 270                 *timeout = NFS4_POLL_RETRY_MIN;
 271         if (*timeout > NFS4_POLL_RETRY_MAX)
 272                 *timeout = NFS4_POLL_RETRY_MAX;
 273         freezable_schedule_timeout_killable(*timeout);
 274         if (fatal_signal_pending(current))
 275                 res = -ERESTARTSYS;
 276         *timeout <<= 1;
 277         return res;
 278 }
 279
 280 /* This is the error handling routine for processes that are allowed
 281  * to sleep.
 282  */
 283 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 284 {
 285         struct nfs_client *clp = server->nfs_client;
 286         struct nfs4_state *state = exception->state;
 287         struct inode *inode = exception->inode;
 288         int ret = errorcode;
 289
 290         exception->retry = 0;
 291         switch(errorcode) {
 292                 case 0:
 293                         return 0;
 294                 case -NFS4ERR_OPENMODE:
 295                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 296                                 nfs4_inode_return_delegation(inode);
 297                                 exception->retry = 1;
 298                                 return 0;
 299                         }
 300                         if (state == NULL)
 301                                 break;
 302                         ret = nfs4_schedule_stateid_recovery(server, state);
 303                         if (ret < 0)
 304                                 break;
 305                         goto wait_on_recovery;
 306                 case -NFS4ERR_DELEG_REVOKED:
 307                 case -NFS4ERR_ADMIN_REVOKED:
 308                 case -NFS4ERR_BAD_STATEID:
 309                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 310                                 nfs_remove_bad_delegation(inode);
 311                                 exception->retry = 1;
 312                                 break;
 313                         }
 314                         if (state == NULL)
 315                                 break;
 316                         ret = nfs4_schedule_stateid_recovery(server, state);
 317                         if (ret < 0)
 318                                 break;
 319                         goto wait_on_recovery;
 320                 case -NFS4ERR_EXPIRED:
 321                         if (state != NULL) {
 322                                 ret = nfs4_schedule_stateid_recovery(server, state);
 323                                 if (ret < 0)
 324                                         break;
 325                         }
 326                 case -NFS4ERR_STALE_STATEID:
 327                 case -NFS4ERR_STALE_CLIENTID:
 328                         nfs4_schedule_lease_recovery(clp);
 329                         goto wait_on_recovery;
 330 #if defined(CONFIG_NFS_V4_1)
 331                 case -NFS4ERR_BADSESSION:
 332                 case -NFS4ERR_BADSLOT:
 333                 case -NFS4ERR_BAD_HIGH_SLOT:
 334                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 335                 case -NFS4ERR_DEADSESSION:
 336                 case -NFS4ERR_SEQ_FALSE_RETRY:
 337                 case -NFS4ERR_SEQ_MISORDERED:
 338                         dprintk("%s ERROR: %d Reset session\n", __func__,
 339                                 errorcode);
 340                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 341                         goto wait_on_recovery;
 342 #endif /* defined(CONFIG_NFS_V4_1) */
 343                 case -NFS4ERR_FILE_OPEN:
 344                         if (exception->timeout > HZ) {
 345                                 /* We have retried a decent amount, time to
 346                                  * fail
 347                                  */
 348                                 ret = -EBUSY;
 349                                 break;
 350                         }
 351                 case -NFS4ERR_GRACE:
 352                 case -NFS4ERR_DELAY:
 353                         ret = nfs4_delay(server->client, &exception->timeout);
 354                         if (ret != 0)
 355                                 break;
 356                 case -NFS4ERR_RETRY_UNCACHED_REP:
 357                 case -NFS4ERR_OLD_STATEID:
 358                         exception->retry = 1;
 359                         break;
 360                 case -NFS4ERR_BADOWNER:
 361                         /* The following works around a Linux server bug! */
 362                 case -NFS4ERR_BADNAME:
 363                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 364                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 365                                 exception->retry = 1;
 366                                 printk(KERN_WARNING "NFS: v4 server %s "
 367                                                 "does not accept raw "
 368                                                 "uid/gids. "
 369                                                 "Reenabling the idmapper.\n",
 370                                                 server->nfs_client->cl_hostname);
 371                         }
 372         }
 373         /* We failed to handle the error */
 374         return nfs4_map_errors(ret);
 375 wait_on_recovery:
 376         ret = nfs4_wait_clnt_recover(clp);
 377         if (ret == 0)
 378                 exception->retry = 1;
 379         return ret;
 380 }
 381
 382
 383 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 384 {
 385         spin_lock(&clp->cl_lock);
 386         if (time_before(clp->cl_last_renewal,timestamp))
 387                 clp->cl_last_renewal = timestamp;
 388         spin_unlock(&clp->cl_lock);
 389 }
 390
 391 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 392 {
 393         do_renew_lease(server->nfs_client, timestamp);
 394 }
 395
 396 #if defined(CONFIG_NFS_V4_1)
 397
 398 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 399 {
 400         struct nfs4_session *session;
 401         struct nfs4_slot_table *tbl;
 402         bool send_new_highest_used_slotid = false;
 403
 404         if (!res->sr_slot) {
 405                 /* just wake up the next guy waiting since
 406                  * we may have not consumed a slot after all */
 407                 dprintk("%s: No slot\n", __func__);
 408                 return;
 409         }
 410         tbl = res->sr_slot->table;
 411         session = tbl->session;
 412
 413         spin_lock(&tbl->slot_tbl_lock);
 414         /* Be nice to the server: try to ensure that the last transmitted
 415          * value for highest_user_slotid <= target_highest_slotid
 416          */
 417         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 418                 send_new_highest_used_slotid = true;
 419
 420         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 421                 send_new_highest_used_slotid = false;
 422                 goto out_unlock;
 423         }
 424         nfs4_free_slot(tbl, res->sr_slot);
 425
 426         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 427                 send_new_highest_used_slotid = false;
 428 out_unlock:
 429         spin_unlock(&tbl->slot_tbl_lock);
 430         res->sr_slot = NULL;
 431         if (send_new_highest_used_slotid)
 432                 nfs41_server_notify_highest_slotid_update(session->clp);
 433 }
 434
 435 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 436 {
 437         struct nfs4_session *session;
 438         struct nfs4_slot *slot;
 439         struct nfs_client *clp;
 440         bool interrupted = false;
 441         int ret = 1;
 442
 443         /* don't increment the sequence number if the task wasn't sent */
 444         if (!RPC_WAS_SENT(task))
 445                 goto out;
 446
 447         slot = res->sr_slot;
 448         session = slot->table->session;
 449
 450         if (slot->interrupted) {
 451                 slot->interrupted = 0;
 452                 interrupted = true;
 453         }
 454
 455         /* Check the SEQUENCE operation status */
 456         switch (res->sr_status) {
 457         case 0:
 458                 /* Update the slot's sequence and clientid lease timer */
 459                 ++slot->seq_nr;
 460                 clp = session->clp;
 461                 do_renew_lease(clp, res->sr_timestamp);
 462                 /* Check sequence flags */
 463                 if (res->sr_status_flags != 0)
 464                         nfs4_schedule_lease_recovery(clp);
 465                 nfs41_update_target_slotid(slot->table, slot, res);
 466                 break;
 467         case 1:
 468                 /*
 469                  * sr_status remains 1 if an RPC level error occurred.
 470                  * The server may or may not have processed the sequence
 471                  * operation..
 472                  * Mark the slot as having hosted an interrupted RPC call.
 473                  */
 474                 slot->interrupted = 1;
 475                 goto out;
 476         case -NFS4ERR_DELAY:
 477                 /* The server detected a resend of the RPC call and
 478                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 479                  * of RFC5661.
 480                  */
 481                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 482                         __func__,
 483                         slot->slot_nr,
 484                         slot->seq_nr);
 485                 goto out_retry;
 486         case -NFS4ERR_BADSLOT:
 487                 /*
 488                  * The slot id we used was probably retired. Try again
 489                  * using a different slot id.
 490                  */
 491                 goto retry_nowait;
 492         case -NFS4ERR_SEQ_MISORDERED:
 493                 /*
 494                  * Was the last operation on this sequence interrupted?
 495                  * If so, retry after bumping the sequence number.
 496                  */
 497                 if (interrupted) {
 498                         ++slot->seq_nr;
 499                         goto retry_nowait;
 500                 }
 501                 /*
 502                  * Could this slot have been previously retired?
 503                  * If so, then the server may be expecting seq_nr = 1!
 504                  */
 505                 if (slot->seq_nr != 1) {
 506                         slot->seq_nr = 1;
 507                         goto retry_nowait;
 508                 }
 509                 break;
 510         case -NFS4ERR_SEQ_FALSE_RETRY:
 511                 ++slot->seq_nr;
 512                 goto retry_nowait;
 513         default:
 514                 /* Just update the slot sequence no. */
 515                 ++slot->seq_nr;
 516         }
 517 out:
 518         /* The session may be reset by one of the error handlers. */
 519         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 520         nfs41_sequence_free_slot(res);
 521         return ret;
 522 retry_nowait:
 523         if (rpc_restart_call_prepare(task)) {
 524                 task->tk_status = 0;
 525                 ret = 0;
 526         }
 527         goto out;
 528 out_retry:
 529         if (!rpc_restart_call(task))
 530                 goto out;
 531         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 532         return 0;
 533 }
 534
 535 static int nfs4_sequence_done(struct rpc_task *task,
 536                                struct nfs4_sequence_res *res)
 537 {
 538         if (res->sr_slot == NULL)
 539                 return 1;
 540         return nfs41_sequence_done(task, res);
 541 }
 542
 543 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 544                 struct nfs4_sequence_res *res, int cache_reply)
 545 {
 546         args->sa_slot = NULL;
 547         args->sa_cache_this = 0;
 548         args->sa_privileged = 0;
 549         if (cache_reply)
 550                 args->sa_cache_this = 1;
 551         res->sr_slot = NULL;
 552 }
 553
 554 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 555 {
 556         args->sa_privileged = 1;
 557 }
 558
 559 int nfs41_setup_sequence(struct nfs4_session *session,
 560                                 struct nfs4_sequence_args *args,
 561                                 struct nfs4_sequence_res *res,
 562                                 struct rpc_task *task)
 563 {
 564         struct nfs4_slot *slot;
 565         struct nfs4_slot_table *tbl;
 566
 567         dprintk("--> %s\n", __func__);
 568         /* slot already allocated? */
 569         if (res->sr_slot != NULL)
 570                 goto out_success;
 571
 572         tbl = &session->fc_slot_table;
 573
 574         task->tk_timeout = 0;
 575
 576         spin_lock(&tbl->slot_tbl_lock);
 577         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 578             !args->sa_privileged) {
 579                 /* The state manager will wait until the slot table is empty */
 580                 dprintk("%s session is draining\n", __func__);
 581                 goto out_sleep;
 582         }
 583
 584         slot = nfs4_alloc_slot(tbl);
 585         if (IS_ERR(slot)) {
 586                 /* If out of memory, try again in 1/4 second */
 587                 if (slot == ERR_PTR(-ENOMEM))
 588                         task->tk_timeout = HZ >> 2;
 589                 dprintk("<-- %s: no free slots\n", __func__);
 590                 goto out_sleep;
 591         }
 592         spin_unlock(&tbl->slot_tbl_lock);
 593
 594         args->sa_slot = slot;
 595
 596         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 597                         slot->slot_nr, slot->seq_nr);
 598
 599         res->sr_slot = slot;
 600         res->sr_timestamp = jiffies;
 601         res->sr_status_flags = 0;
 602         /*
 603          * sr_status is only set in decode_sequence, and so will remain
 604          * set to 1 if an rpc level failure occurs.
 605          */
 606         res->sr_status = 1;
 607 out_success:
 608         rpc_call_start(task);
 609         return 0;
 610 out_sleep:
 611         /* Privileged tasks are queued with top priority */
 612         if (args->sa_privileged)
 613                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 614                                 NULL, RPC_PRIORITY_PRIVILEGED);
 615         else
 616                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 617         spin_unlock(&tbl->slot_tbl_lock);
 618         return -EAGAIN;
 619 }
 620 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 621
 622 int nfs4_setup_sequence(const struct nfs_server *server,
 623                         struct nfs4_sequence_args *args,
 624                         struct nfs4_sequence_res *res,
 625                         struct rpc_task *task)
 626 {
 627         struct nfs4_session *session = nfs4_get_session(server);
 628         int ret = 0;
 629
 630         if (session == NULL) {
 631                 rpc_call_start(task);
 632                 goto out;
 633         }
 634
 635         dprintk("--> %s clp %p session %p sr_slot %d\n",
 636                 __func__, session->clp, session, res->sr_slot ?
 637                         res->sr_slot->slot_nr : -1);
 638
 639         ret = nfs41_setup_sequence(session, args, res, task);
 640 out:
 641         dprintk("<-- %s status=%d\n", __func__, ret);
 642         return ret;
 643 }
 644
 645 struct nfs41_call_sync_data {
 646         const struct nfs_server *seq_server;
 647         struct nfs4_sequence_args *seq_args;
 648         struct nfs4_sequence_res *seq_res;
 649 };
 650
 651 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 652 {
 653         struct nfs41_call_sync_data *data = calldata;
 654         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 655
 656         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 657
 658         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 659 }
 660
 661 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 662 {
 663         struct nfs41_call_sync_data *data = calldata;
 664
 665         nfs41_sequence_done(task, data->seq_res);
 666 }
 667
 668 static const struct rpc_call_ops nfs41_call_sync_ops = {
 669         .rpc_call_prepare = nfs41_call_sync_prepare,
 670         .rpc_call_done = nfs41_call_sync_done,
 671 };
 672
 673 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 674                                    struct nfs_server *server,
 675                                    struct rpc_message *msg,
 676                                    struct nfs4_sequence_args *args,
 677                                    struct nfs4_sequence_res *res)
 678 {
 679         int ret;
 680         struct rpc_task *task;
 681         struct nfs41_call_sync_data data = {
 682                 .seq_server = server,
 683                 .seq_args = args,
 684                 .seq_res = res,
 685         };
 686         struct rpc_task_setup task_setup = {
 687                 .rpc_client = clnt,
 688                 .rpc_message = msg,
 689                 .callback_ops = &nfs41_call_sync_ops,
 690                 .callback_data = &data
 691         };
 692
 693         task = rpc_run_task(&task_setup);
 694         if (IS_ERR(task))
 695                 ret = PTR_ERR(task);
 696         else {
 697                 ret = task->tk_status;
 698                 rpc_put_task(task);
 699         }
 700         return ret;
 701 }
 702
 703 #else
 704 static
 705 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 706                 struct nfs4_sequence_res *res, int cache_reply)
 707 {
 708 }
 709
 710 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 711 {
 712 }
 713
 714
 715 static int nfs4_sequence_done(struct rpc_task *task,
 716                                struct nfs4_sequence_res *res)
 717 {
 718         return 1;
 719 }
 720 #endif /* CONFIG_NFS_V4_1 */
 721
 722 static
 723 int _nfs4_call_sync(struct rpc_clnt *clnt,
 724                     struct nfs_server *server,
 725                     struct rpc_message *msg,
 726                     struct nfs4_sequence_args *args,
 727                     struct nfs4_sequence_res *res)
 728 {
 729         return rpc_call_sync(clnt, msg, 0);
 730 }
 731
 732 static
 733 int nfs4_call_sync(struct rpc_clnt *clnt,
 734                    struct nfs_server *server,
 735                    struct rpc_message *msg,
 736                    struct nfs4_sequence_args *args,
 737                    struct nfs4_sequence_res *res,
 738                    int cache_reply)
 739 {
 740         nfs41_init_sequence(args, res, cache_reply);
 741         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 742                                                 args, res);
 743 }
 744
 745 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 746 {
 747         struct nfs_inode *nfsi = NFS_I(dir);
 748
 749         spin_lock(&dir->i_lock);
 750         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 751         if (!cinfo->atomic || cinfo->before != dir->i_version)
 752                 nfs_force_lookup_revalidate(dir);
 753         dir->i_version = cinfo->after;
 754         nfs_fscache_invalidate(dir);
 755         spin_unlock(&dir->i_lock);
 756 }
 757
 758 struct nfs4_opendata {
 759         struct kref kref;
 760         struct nfs_openargs o_arg;
 761         struct nfs_openres o_res;
 762         struct nfs_open_confirmargs c_arg;
 763         struct nfs_open_confirmres c_res;
 764         struct nfs4_string owner_name;
 765         struct nfs4_string group_name;
 766         struct nfs_fattr f_attr;
 767         struct dentry *dir;
 768         struct dentry *dentry;
 769         struct nfs4_state_owner *owner;
 770         struct nfs4_state *state;
 771         struct iattr attrs;
 772         unsigned long timestamp;
 773         unsigned int rpc_done : 1;
 774         unsigned int is_recover : 1;
 775         int rpc_status;
 776         int cancelled;
 777 };
 778
 779 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 780                 int err, struct nfs4_exception *exception)
 781 {
 782         if (err != -EINVAL)
 783                 return false;
 784         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 785                 return false;
 786         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 787         exception->retry = 1;
 788         return true;
 789 }
 790
 791 static enum open_claim_type4
 792 nfs4_map_atomic_open_claim(struct nfs_server *server,
 793                 enum open_claim_type4 claim)
 794 {
 795         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 796                 return claim;
 797         switch (claim) {
 798         default:
 799                 return claim;
 800         case NFS4_OPEN_CLAIM_FH:
 801                 return NFS4_OPEN_CLAIM_NULL;
 802         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 803                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 804         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 805                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 806         }
 807 }
 808
 809 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 810 {
 811         p->o_res.f_attr = &p->f_attr;
 812         p->o_res.seqid = p->o_arg.seqid;
 813         p->c_res.seqid = p->c_arg.seqid;
 814         p->o_res.server = p->o_arg.server;
 815         p->o_res.access_request = p->o_arg.access;
 816         nfs_fattr_init(&p->f_attr);
 817         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 818 }
 819
 820 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 821                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 822                 const struct iattr *attrs,
 823                 enum open_claim_type4 claim,
 824                 gfp_t gfp_mask)
 825 {
 826         struct dentry *parent = dget_parent(dentry);
 827         struct inode *dir = parent->d_inode;
 828         struct nfs_server *server = NFS_SERVER(dir);
 829         struct nfs4_opendata *p;
 830
 831         p = kzalloc(sizeof(*p), gfp_mask);
 832         if (p == NULL)
 833                 goto err;
 834         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 835         if (p->o_arg.seqid == NULL)
 836                 goto err_free;
 837         nfs_sb_active(dentry->d_sb);
 838         p->dentry = dget(dentry);
 839         p->dir = parent;
 840         p->owner = sp;
 841         atomic_inc(&sp->so_count);
 842         p->o_arg.open_flags = flags;
 843         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 844         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 845          * will return permission denied for all bits until close */
 846         if (!(flags & O_EXCL)) {
 847                 /* ask server to check for all possible rights as results
 848                  * are cached */
 849                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 850                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 851         }
 852         p->o_arg.clientid = server->nfs_client->cl_clientid;
 853         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 854         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 855         p->o_arg.name = &dentry->d_name;
 856         p->o_arg.server = server;
 857         p->o_arg.bitmask = server->attr_bitmask;
 858         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 859         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
 860         switch (p->o_arg.claim) {
 861         case NFS4_OPEN_CLAIM_NULL:
 862         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 863         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 864                 p->o_arg.fh = NFS_FH(dir);
 865                 break;
 866         case NFS4_OPEN_CLAIM_PREVIOUS:
 867         case NFS4_OPEN_CLAIM_FH:
 868         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 869         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 870                 p->o_arg.fh = NFS_FH(dentry->d_inode);
 871         }
 872         if (attrs != NULL && attrs->ia_valid != 0) {
 873                 __be32 verf[2];
 874
 875                 p->o_arg.u.attrs = &p->attrs;
 876                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 877
 878                 verf[0] = jiffies;
 879                 verf[1] = current->pid;
 880                 memcpy(p->o_arg.u.verifier.data, verf,
 881                                 sizeof(p->o_arg.u.verifier.data));
 882         }
 883         p->c_arg.fh = &p->o_res.fh;
 884         p->c_arg.stateid = &p->o_res.stateid;
 885         p->c_arg.seqid = p->o_arg.seqid;
 886         nfs4_init_opendata_res(p);
 887         kref_init(&p->kref);
 888         return p;
 889 err_free:
 890         kfree(p);
 891 err:
 892         dput(parent);
 893         return NULL;
 894 }
 895
 896 static void nfs4_opendata_free(struct kref *kref)
 897 {
 898         struct nfs4_opendata *p = container_of(kref,
 899                         struct nfs4_opendata, kref);
 900         struct super_block *sb = p->dentry->d_sb;
 901
 902         nfs_free_seqid(p->o_arg.seqid);
 903         if (p->state != NULL)
 904                 nfs4_put_open_state(p->state);
 905         nfs4_put_state_owner(p->owner);
 906         dput(p->dir);
 907         dput(p->dentry);
 908         nfs_sb_deactive(sb);
 909         nfs_fattr_free_names(&p->f_attr);
 910         kfree(p);
 911 }
 912
 913 static void nfs4_opendata_put(struct nfs4_opendata *p)
 914 {
 915         if (p != NULL)
 916                 kref_put(&p->kref, nfs4_opendata_free);
 917 }
 918
 919 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 920 {
 921         int ret;
 922
 923         ret = rpc_wait_for_completion_task(task);
 924         return ret;
 925 }
 926
 927 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 928 {
 929         int ret = 0;
 930
 931         if (open_mode & (O_EXCL|O_TRUNC))
 932                 goto out;
 933         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 934                 case FMODE_READ:
 935                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 936                                 && state->n_rdonly != 0;
 937                         break;
 938                 case FMODE_WRITE:
 939                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 940                                 && state->n_wronly != 0;
 941                         break;
 942                 case FMODE_READ|FMODE_WRITE:
 943                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 944                                 && state->n_rdwr != 0;
 945         }
 946 out:
 947         return ret;
 948 }
 949
 950 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 951 {
 952         if (delegation == NULL)
 953                 return 0;
 954         if ((delegation->type & fmode) != fmode)
 955                 return 0;
 956         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 957                 return 0;
 958         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 959                 return 0;
 960         nfs_mark_delegation_referenced(delegation);
 961         return 1;
 962 }
 963
 964 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 965 {
 966         switch (fmode) {
 967                 case FMODE_WRITE:
 968                         state->n_wronly++;
 969                         break;
 970                 case FMODE_READ:
 971                         state->n_rdonly++;
 972                         break;
 973                 case FMODE_READ|FMODE_WRITE:
 974                         state->n_rdwr++;
 975         }
 976         nfs4_state_set_mode_locked(state, state->state | fmode);
 977 }
 978
 979 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 980 {
 981         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 982                 nfs4_stateid_copy(&state->stateid, stateid);
 983         nfs4_stateid_copy(&state->open_stateid, stateid);
 984         set_bit(NFS_OPEN_STATE, &state->flags);
 985         switch (fmode) {
 986                 case FMODE_READ:
 987                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 988                         break;
 989                 case FMODE_WRITE:
 990                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 991                         break;
 992                 case FMODE_READ|FMODE_WRITE:
 993                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 994         }
 995 }
 996
 997 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 998 {
 999         write_seqlock(&state->seqlock);
1000         nfs_set_open_stateid_locked(state, stateid, fmode);
1001         write_sequnlock(&state->seqlock);
1002 }
1003
1004 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1005 {
1006         /*
1007          * Protect the call to nfs4_state_set_mode_locked and
1008          * serialise the stateid update
1009          */
1010         write_seqlock(&state->seqlock);
1011         if (deleg_stateid != NULL) {
1012                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1013                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1014         }
1015         if (open_stateid != NULL)
1016                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1017         write_sequnlock(&state->seqlock);
1018         spin_lock(&state->owner->so_lock);
1019         update_open_stateflags(state, fmode);
1020         spin_unlock(&state->owner->so_lock);
1021 }
1022
1023 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1024 {
1025         struct nfs_inode *nfsi = NFS_I(state->inode);
1026         struct nfs_delegation *deleg_cur;
1027         int ret = 0;
1028
1029         fmode &= (FMODE_READ|FMODE_WRITE);
1030
1031         rcu_read_lock();
1032         deleg_cur = rcu_dereference(nfsi->delegation);
1033         if (deleg_cur == NULL)
1034                 goto no_delegation;
1035
1036         spin_lock(&deleg_cur->lock);
1037         if (nfsi->delegation != deleg_cur ||
1038            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1039             (deleg_cur->type & fmode) != fmode)
1040                 goto no_delegation_unlock;
1041
1042         if (delegation == NULL)
1043                 delegation = &deleg_cur->stateid;
1044         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1045                 goto no_delegation_unlock;
1046
1047         nfs_mark_delegation_referenced(deleg_cur);
1048         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1049         ret = 1;
1050 no_delegation_unlock:
1051         spin_unlock(&deleg_cur->lock);
1052 no_delegation:
1053         rcu_read_unlock();
1054
1055         if (!ret && open_stateid != NULL) {
1056                 __update_open_stateid(state, open_stateid, NULL, fmode);
1057                 ret = 1;
1058         }
1059
1060         return ret;
1061 }
1062
1063
1064 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1065 {
1066         struct nfs_delegation *delegation;
1067
1068         rcu_read_lock();
1069         delegation = rcu_dereference(NFS_I(inode)->delegation);
1070         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1071                 rcu_read_unlock();
1072                 return;
1073         }
1074         rcu_read_unlock();
1075         nfs4_inode_return_delegation(inode);
1076 }
1077
1078 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1079 {
1080         struct nfs4_state *state = opendata->state;
1081         struct nfs_inode *nfsi = NFS_I(state->inode);
1082         struct nfs_delegation *delegation;
1083         int open_mode = opendata->o_arg.open_flags;
1084         fmode_t fmode = opendata->o_arg.fmode;
1085         nfs4_stateid stateid;
1086         int ret = -EAGAIN;
1087
1088         for (;;) {
1089                 if (can_open_cached(state, fmode, open_mode)) {
1090                         spin_lock(&state->owner->so_lock);
1091                         if (can_open_cached(state, fmode, open_mode)) {
1092                                 update_open_stateflags(state, fmode);
1093                                 spin_unlock(&state->owner->so_lock);
1094                                 goto out_return_state;
1095                         }
1096                         spin_unlock(&state->owner->so_lock);
1097                 }
1098                 rcu_read_lock();
1099                 delegation = rcu_dereference(nfsi->delegation);
1100                 if (!can_open_delegated(delegation, fmode)) {
1101                         rcu_read_unlock();
1102                         break;
1103                 }
1104                 /* Save the delegation */
1105                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1106                 rcu_read_unlock();
1107                 nfs_release_seqid(opendata->o_arg.seqid);
1108                 if (!opendata->is_recover) {
1109                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1110                         if (ret != 0)
1111                                 goto out;
1112                 }
1113                 ret = -EAGAIN;
1114
1115                 /* Try to update the stateid using the delegation */
1116                 if (update_open_stateid(state, NULL, &stateid, fmode))
1117                         goto out_return_state;
1118         }
1119 out:
1120         return ERR_PTR(ret);
1121 out_return_state:
1122         atomic_inc(&state->count);
1123         return state;
1124 }
1125
1126 static void
1127 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1128 {
1129         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1130         struct nfs_delegation *delegation;
1131         int delegation_flags = 0;
1132
1133         rcu_read_lock();
1134         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1135         if (delegation)
1136                 delegation_flags = delegation->flags;
1137         rcu_read_unlock();
1138         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1139                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1140                                    "returning a delegation for "
1141                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1142                                    clp->cl_hostname);
1143         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1144                 nfs_inode_set_delegation(state->inode,
1145                                          data->owner->so_cred,
1146                                          &data->o_res);
1147         else
1148                 nfs_inode_reclaim_delegation(state->inode,
1149                                              data->owner->so_cred,
1150                                              &data->o_res);
1151 }
1152
1153 /*
1154  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1155  * and update the nfs4_state.
1156  */
1157 static struct nfs4_state *
1158 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1159 {
1160         struct inode *inode = data->state->inode;
1161         struct nfs4_state *state = data->state;
1162         int ret;
1163
1164         if (!data->rpc_done) {
1165                 ret = data->rpc_status;
1166                 goto err;
1167         }
1168
1169         ret = -ESTALE;
1170         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1171             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1172             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1173                 goto err;
1174
1175         ret = -ENOMEM;
1176         state = nfs4_get_open_state(inode, data->owner);
1177         if (state == NULL)
1178                 goto err;
1179
1180         ret = nfs_refresh_inode(inode, &data->f_attr);
1181         if (ret)
1182                 goto err;
1183
1184         if (data->o_res.delegation_type != 0)
1185                 nfs4_opendata_check_deleg(data, state);
1186         update_open_stateid(state, &data->o_res.stateid, NULL,
1187                             data->o_arg.fmode);
1188
1189         return state;
1190 err:
1191         return ERR_PTR(ret);
1192
1193 }
1194
1195 static struct nfs4_state *
1196 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1197 {
1198         struct inode *inode;
1199         struct nfs4_state *state = NULL;
1200         int ret;
1201
1202         if (!data->rpc_done) {
1203                 state = nfs4_try_open_cached(data);
1204                 goto out;
1205         }
1206
1207         ret = -EAGAIN;
1208         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1209                 goto err;
1210         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1211         ret = PTR_ERR(inode);
1212         if (IS_ERR(inode))
1213                 goto err;
1214         ret = -ENOMEM;
1215         state = nfs4_get_open_state(inode, data->owner);
1216         if (state == NULL)
1217                 goto err_put_inode;
1218         if (data->o_res.delegation_type != 0)
1219                 nfs4_opendata_check_deleg(data, state);
1220         update_open_stateid(state, &data->o_res.stateid, NULL,
1221                         data->o_arg.fmode);
1222         iput(inode);
1223 out:
1224         nfs_release_seqid(data->o_arg.seqid);
1225         return state;
1226 err_put_inode:
1227         iput(inode);
1228 err:
1229         return ERR_PTR(ret);
1230 }
1231
1232 static struct nfs4_state *
1233 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1234 {
1235         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1236                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1237         return _nfs4_opendata_to_nfs4_state(data);
1238 }
1239
1240 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1241 {
1242         struct nfs_inode *nfsi = NFS_I(state->inode);
1243         struct nfs_open_context *ctx;
1244
1245         spin_lock(&state->inode->i_lock);
1246         list_for_each_entry(ctx, &nfsi->open_files, list) {
1247                 if (ctx->state != state)
1248                         continue;
1249                 get_nfs_open_context(ctx);
1250                 spin_unlock(&state->inode->i_lock);
1251                 return ctx;
1252         }
1253         spin_unlock(&state->inode->i_lock);
1254         return ERR_PTR(-ENOENT);
1255 }
1256
1257 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1258                 struct nfs4_state *state, enum open_claim_type4 claim)
1259 {
1260         struct nfs4_opendata *opendata;
1261
1262         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1263                         NULL, claim, GFP_NOFS);
1264         if (opendata == NULL)
1265                 return ERR_PTR(-ENOMEM);
1266         opendata->state = state;
1267         atomic_inc(&state->count);
1268         return opendata;
1269 }
1270
1271 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1272 {
1273         struct nfs4_state *newstate;
1274         int ret;
1275
1276         opendata->o_arg.open_flags = 0;
1277         opendata->o_arg.fmode = fmode;
1278         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1279         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1280         nfs4_init_opendata_res(opendata);
1281         ret = _nfs4_recover_proc_open(opendata);
1282         if (ret != 0)
1283                 return ret;
1284         newstate = nfs4_opendata_to_nfs4_state(opendata);
1285         if (IS_ERR(newstate))
1286                 return PTR_ERR(newstate);
1287         nfs4_close_state(newstate, fmode);
1288         *res = newstate;
1289         return 0;
1290 }
1291
1292 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1293 {
1294         struct nfs4_state *newstate;
1295         int ret;
1296
1297         /* memory barrier prior to reading state->n_* */
1298         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1299         clear_bit(NFS_OPEN_STATE, &state->flags);
1300         smp_rmb();
1301         if (state->n_rdwr != 0) {
1302                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1303                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1304                 if (ret != 0)
1305                         return ret;
1306                 if (newstate != state)
1307                         return -ESTALE;
1308         }
1309         if (state->n_wronly != 0) {
1310                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1311                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1312                 if (ret != 0)
1313                         return ret;
1314                 if (newstate != state)
1315                         return -ESTALE;
1316         }
1317         if (state->n_rdonly != 0) {
1318                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1319                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1320                 if (ret != 0)
1321                         return ret;
1322                 if (newstate != state)
1323                         return -ESTALE;
1324         }
1325         /*
1326          * We may have performed cached opens for all three recoveries.
1327          * Check if we need to update the current stateid.
1328          */
1329         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1330             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1331                 write_seqlock(&state->seqlock);
1332                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1333                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1334                 write_sequnlock(&state->seqlock);
1335         }
1336         return 0;
1337 }
1338
1339 /*
1340  * OPEN_RECLAIM:
1341  *      reclaim state on the server after a reboot.
1342  */
1343 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1344 {
1345         struct nfs_delegation *delegation;
1346         struct nfs4_opendata *opendata;
1347         fmode_t delegation_type = 0;
1348         int status;
1349
1350         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1351                         NFS4_OPEN_CLAIM_PREVIOUS);
1352         if (IS_ERR(opendata))
1353                 return PTR_ERR(opendata);
1354         rcu_read_lock();
1355         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1356         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1357                 delegation_type = delegation->type;
1358         rcu_read_unlock();
1359         opendata->o_arg.u.delegation_type = delegation_type;
1360         status = nfs4_open_recover(opendata, state);
1361         nfs4_opendata_put(opendata);
1362         return status;
1363 }
1364
1365 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1366 {
1367         struct nfs_server *server = NFS_SERVER(state->inode);
1368         struct nfs4_exception exception = { };
1369         int err;
1370         do {
1371                 err = _nfs4_do_open_reclaim(ctx, state);
1372                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1373                         continue;
1374                 if (err != -NFS4ERR_DELAY)
1375                         break;
1376                 nfs4_handle_exception(server, err, &exception);
1377         } while (exception.retry);
1378         return err;
1379 }
1380
1381 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1382 {
1383         struct nfs_open_context *ctx;
1384         int ret;
1385
1386         ctx = nfs4_state_find_open_context(state);
1387         if (IS_ERR(ctx))
1388                 return -EAGAIN;
1389         ret = nfs4_do_open_reclaim(ctx, state);
1390         put_nfs_open_context(ctx);
1391         return ret;
1392 }
1393
1394 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1395 {
1396         switch (err) {
1397                 default:
1398                         printk(KERN_ERR "NFS: %s: unhandled error "
1399                                         "%d.\n", __func__, err);
1400                 case 0:
1401                 case -ENOENT:
1402                 case -ESTALE:
1403                         break;
1404                 case -NFS4ERR_BADSESSION:
1405                 case -NFS4ERR_BADSLOT:
1406                 case -NFS4ERR_BAD_HIGH_SLOT:
1407                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1408                 case -NFS4ERR_DEADSESSION:
1409                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1410                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1411                         return -EAGAIN;
1412                 case -NFS4ERR_STALE_CLIENTID:
1413                 case -NFS4ERR_STALE_STATEID:
1414                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1415                 case -NFS4ERR_EXPIRED:
1416                         /* Don't recall a delegation if it was lost */
1417                         nfs4_schedule_lease_recovery(server->nfs_client);
1418                         return -EAGAIN;
1419                 case -NFS4ERR_DELEG_REVOKED:
1420                 case -NFS4ERR_ADMIN_REVOKED:
1421                 case -NFS4ERR_BAD_STATEID:
1422                 case -NFS4ERR_OPENMODE:
1423                         nfs_inode_find_state_and_recover(state->inode,
1424                                         stateid);
1425                         nfs4_schedule_stateid_recovery(server, state);
1426                         return 0;
1427                 case -NFS4ERR_DELAY:
1428                 case -NFS4ERR_GRACE:
1429                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1430                         ssleep(1);
1431                         return -EAGAIN;
1432                 case -ENOMEM:
1433                 case -NFS4ERR_DENIED:
1434                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1435                         return 0;
1436         }
1437         return err;
1438 }
1439
1440 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1441 {
1442         struct nfs_server *server = NFS_SERVER(state->inode);
1443         struct nfs4_opendata *opendata;
1444         int err;
1445
1446         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1447                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1448         if (IS_ERR(opendata))
1449                 return PTR_ERR(opendata);
1450         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1451         err = nfs4_open_recover(opendata, state);
1452         nfs4_opendata_put(opendata);
1453         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1454 }
1455
1456 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1457 {
1458         struct nfs4_opendata *data = calldata;
1459
1460         data->rpc_status = task->tk_status;
1461         if (data->rpc_status == 0) {
1462                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1463                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1464                 renew_lease(data->o_res.server, data->timestamp);
1465                 data->rpc_done = 1;
1466         }
1467 }
1468
1469 static void nfs4_open_confirm_release(void *calldata)
1470 {
1471         struct nfs4_opendata *data = calldata;
1472         struct nfs4_state *state = NULL;
1473
1474         /* If this request hasn't been cancelled, do nothing */
1475         if (data->cancelled == 0)
1476                 goto out_free;
1477         /* In case of error, no cleanup! */
1478         if (!data->rpc_done)
1479                 goto out_free;
1480         state = nfs4_opendata_to_nfs4_state(data);
1481         if (!IS_ERR(state))
1482                 nfs4_close_state(state, data->o_arg.fmode);
1483 out_free:
1484         nfs4_opendata_put(data);
1485 }
1486
1487 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1488         .rpc_call_done = nfs4_open_confirm_done,
1489         .rpc_release = nfs4_open_confirm_release,
1490 };
1491
1492 /*
1493  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1494  */
1495 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1496 {
1497         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1498         struct rpc_task *task;
1499         struct  rpc_message msg = {
1500                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1501                 .rpc_argp = &data->c_arg,
1502                 .rpc_resp = &data->c_res,
1503                 .rpc_cred = data->owner->so_cred,
1504         };
1505         struct rpc_task_setup task_setup_data = {
1506                 .rpc_client = server->client,
1507                 .rpc_message = &msg,
1508                 .callback_ops = &nfs4_open_confirm_ops,
1509                 .callback_data = data,
1510                 .workqueue = nfsiod_workqueue,
1511                 .flags = RPC_TASK_ASYNC,
1512         };
1513         int status;
1514
1515         kref_get(&data->kref);
1516         data->rpc_done = 0;
1517         data->rpc_status = 0;
1518         data->timestamp = jiffies;
1519         task = rpc_run_task(&task_setup_data);
1520         if (IS_ERR(task))
1521                 return PTR_ERR(task);
1522         status = nfs4_wait_for_completion_rpc_task(task);
1523         if (status != 0) {
1524                 data->cancelled = 1;
1525                 smp_wmb();
1526         } else
1527                 status = data->rpc_status;
1528         rpc_put_task(task);
1529         return status;
1530 }
1531
1532 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1533 {
1534         struct nfs4_opendata *data = calldata;
1535         struct nfs4_state_owner *sp = data->owner;
1536         struct nfs_client *clp = sp->so_server->nfs_client;
1537
1538         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1539                 goto out_wait;
1540         /*
1541          * Check if we still need to send an OPEN call, or if we can use
1542          * a delegation instead.
1543          */
1544         if (data->state != NULL) {
1545                 struct nfs_delegation *delegation;
1546
1547                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1548                         goto out_no_action;
1549                 rcu_read_lock();
1550                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1551                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1552                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1553                     can_open_delegated(delegation, data->o_arg.fmode))
1554                         goto unlock_no_action;
1555                 rcu_read_unlock();
1556         }
1557         /* Update client id. */
1558         data->o_arg.clientid = clp->cl_clientid;
1559         switch (data->o_arg.claim) {
1560         case NFS4_OPEN_CLAIM_PREVIOUS:
1561         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1562         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1563                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1564         case NFS4_OPEN_CLAIM_FH:
1565                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1566                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1567         }
1568         data->timestamp = jiffies;
1569         if (nfs4_setup_sequence(data->o_arg.server,
1570                                 &data->o_arg.seq_args,
1571                                 &data->o_res.seq_res,
1572                                 task) != 0)
1573                 nfs_release_seqid(data->o_arg.seqid);
1574
1575         /* Set the create mode (note dependency on the session type) */
1576         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1577         if (data->o_arg.open_flags & O_EXCL) {
1578                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1579                 if (nfs4_has_persistent_session(clp))
1580                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1581                 else if (clp->cl_mvops->minor_version > 0)
1582                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1583         }
1584         return;
1585 unlock_no_action:
1586         rcu_read_unlock();
1587 out_no_action:
1588         task->tk_action = NULL;
1589 out_wait:
1590         nfs4_sequence_done(task, &data->o_res.seq_res);
1591 }
1592
1593 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1594 {
1595         struct nfs4_opendata *data = calldata;
1596
1597         data->rpc_status = task->tk_status;
1598
1599         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1600                 return;
1601
1602         if (task->tk_status == 0) {
1603                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1604                         switch (data->o_res.f_attr->mode & S_IFMT) {
1605                         case S_IFREG:
1606                                 break;
1607                         case S_IFLNK:
1608                                 data->rpc_status = -ELOOP;
1609                                 break;
1610                         case S_IFDIR:
1611                                 data->rpc_status = -EISDIR;
1612                                 break;
1613                         default:
1614                                 data->rpc_status = -ENOTDIR;
1615                         }
1616                 }
1617                 renew_lease(data->o_res.server, data->timestamp);
1618                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1619                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1620         }
1621         data->rpc_done = 1;
1622 }
1623
1624 static void nfs4_open_release(void *calldata)
1625 {
1626         struct nfs4_opendata *data = calldata;
1627         struct nfs4_state *state = NULL;
1628
1629         /* If this request hasn't been cancelled, do nothing */
1630         if (data->cancelled == 0)
1631                 goto out_free;
1632         /* In case of error, no cleanup! */
1633         if (data->rpc_status != 0 || !data->rpc_done)
1634                 goto out_free;
1635         /* In case we need an open_confirm, no cleanup! */
1636         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1637                 goto out_free;
1638         state = nfs4_opendata_to_nfs4_state(data);
1639         if (!IS_ERR(state))
1640                 nfs4_close_state(state, data->o_arg.fmode);
1641 out_free:
1642         nfs4_opendata_put(data);
1643 }
1644
1645 static const struct rpc_call_ops nfs4_open_ops = {
1646         .rpc_call_prepare = nfs4_open_prepare,
1647         .rpc_call_done = nfs4_open_done,
1648         .rpc_release = nfs4_open_release,
1649 };
1650
1651 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1652 {
1653         struct inode *dir = data->dir->d_inode;
1654         struct nfs_server *server = NFS_SERVER(dir);
1655         struct nfs_openargs *o_arg = &data->o_arg;
1656         struct nfs_openres *o_res = &data->o_res;
1657         struct rpc_task *task;
1658         struct rpc_message msg = {
1659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1660                 .rpc_argp = o_arg,
1661                 .rpc_resp = o_res,
1662                 .rpc_cred = data->owner->so_cred,
1663         };
1664         struct rpc_task_setup task_setup_data = {
1665                 .rpc_client = server->client,
1666                 .rpc_message = &msg,
1667                 .callback_ops = &nfs4_open_ops,
1668                 .callback_data = data,
1669                 .workqueue = nfsiod_workqueue,
1670                 .flags = RPC_TASK_ASYNC,
1671         };
1672         int status;
1673
1674         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1675         kref_get(&data->kref);
1676         data->rpc_done = 0;
1677         data->rpc_status = 0;
1678         data->cancelled = 0;
1679         data->is_recover = 0;
1680         if (isrecover) {
1681                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1682                 data->is_recover = 1;
1683         }
1684         task = rpc_run_task(&task_setup_data);
1685         if (IS_ERR(task))
1686                 return PTR_ERR(task);
1687         status = nfs4_wait_for_completion_rpc_task(task);
1688         if (status != 0) {
1689                 data->cancelled = 1;
1690                 smp_wmb();
1691         } else
1692                 status = data->rpc_status;
1693         rpc_put_task(task);
1694
1695         return status;
1696 }
1697
1698 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1699 {
1700         struct inode *dir = data->dir->d_inode;
1701         struct nfs_openres *o_res = &data->o_res;
1702         int status;
1703
1704         status = nfs4_run_open_task(data, 1);
1705         if (status != 0 || !data->rpc_done)
1706                 return status;
1707
1708         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1709
1710         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1711                 status = _nfs4_proc_open_confirm(data);
1712                 if (status != 0)
1713                         return status;
1714         }
1715
1716         return status;
1717 }
1718
1719 static int nfs4_opendata_access(struct rpc_cred *cred,
1720                                 struct nfs4_opendata *opendata,
1721                                 struct nfs4_state *state, fmode_t fmode,
1722                                 int openflags)
1723 {
1724         struct nfs_access_entry cache;
1725         u32 mask;
1726
1727         /* access call failed or for some reason the server doesn't
1728          * support any access modes -- defer access call until later */
1729         if (opendata->o_res.access_supported == 0)
1730                 return 0;
1731
1732         mask = 0;
1733         /* don't check MAY_WRITE - a newly created file may not have
1734          * write mode bits, but POSIX allows the creating process to write.
1735          * use openflags to check for exec, because fmode won't
1736          * always have FMODE_EXEC set when file open for exec. */
1737         if (openflags & __FMODE_EXEC) {
1738                 /* ONLY check for exec rights */
1739                 mask = MAY_EXEC;
1740         } else if (fmode & FMODE_READ)
1741                 mask = MAY_READ;
1742
1743         cache.cred = cred;
1744         cache.jiffies = jiffies;
1745         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1746         nfs_access_add_cache(state->inode, &cache);
1747
1748         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1749                 return 0;
1750
1751         /* even though OPEN succeeded, access is denied. Close the file */
1752         nfs4_close_state(state, fmode);
1753         return -EACCES;
1754 }
1755
1756 /*
1757  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1758  */
1759 static int _nfs4_proc_open(struct nfs4_opendata *data)
1760 {
1761         struct inode *dir = data->dir->d_inode;
1762         struct nfs_server *server = NFS_SERVER(dir);
1763         struct nfs_openargs *o_arg = &data->o_arg;
1764         struct nfs_openres *o_res = &data->o_res;
1765         int status;
1766
1767         status = nfs4_run_open_task(data, 0);
1768         if (!data->rpc_done)
1769                 return status;
1770         if (status != 0) {
1771                 if (status == -NFS4ERR_BADNAME &&
1772                                 !(o_arg->open_flags & O_CREAT))
1773                         return -ENOENT;
1774                 return status;
1775         }
1776
1777         nfs_fattr_map_and_free_names(server, &data->f_attr);
1778
1779         if (o_arg->open_flags & O_CREAT)
1780                 update_changeattr(dir, &o_res->cinfo);
1781         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1782                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1783         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1784                 status = _nfs4_proc_open_confirm(data);
1785                 if (status != 0)
1786                         return status;
1787         }
1788         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1789                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1790         return 0;
1791 }
1792
1793 static int nfs4_recover_expired_lease(struct nfs_server *server)
1794 {
1795         return nfs4_client_recover_expired_lease(server->nfs_client);
1796 }
1797
1798 /*
1799  * OPEN_EXPIRED:
1800  *      reclaim state on the server after a network partition.
1801  *      Assumes caller holds the appropriate lock
1802  */
1803 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1804 {
1805         struct nfs4_opendata *opendata;
1806         int ret;
1807
1808         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1809                         NFS4_OPEN_CLAIM_FH);
1810         if (IS_ERR(opendata))
1811                 return PTR_ERR(opendata);
1812         ret = nfs4_open_recover(opendata, state);
1813         if (ret == -ESTALE)
1814                 d_drop(ctx->dentry);
1815         nfs4_opendata_put(opendata);
1816         return ret;
1817 }
1818
1819 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1820 {
1821         struct nfs_server *server = NFS_SERVER(state->inode);
1822         struct nfs4_exception exception = { };
1823         int err;
1824
1825         do {
1826                 err = _nfs4_open_expired(ctx, state);
1827                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1828                         continue;
1829                 switch (err) {
1830                 default:
1831                         goto out;
1832                 case -NFS4ERR_GRACE:
1833                 case -NFS4ERR_DELAY:
1834                         nfs4_handle_exception(server, err, &exception);
1835                         err = 0;
1836                 }
1837         } while (exception.retry);
1838 out:
1839         return err;
1840 }
1841
1842 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1843 {
1844         struct nfs_open_context *ctx;
1845         int ret;
1846
1847         ctx = nfs4_state_find_open_context(state);
1848         if (IS_ERR(ctx))
1849                 return -EAGAIN;
1850         ret = nfs4_do_open_expired(ctx, state);
1851         put_nfs_open_context(ctx);
1852         return ret;
1853 }
1854
1855 #if defined(CONFIG_NFS_V4_1)
1856 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1857 {
1858         struct nfs_server *server = NFS_SERVER(state->inode);
1859         nfs4_stateid *stateid = &state->stateid;
1860         struct nfs_delegation *delegation;
1861         struct rpc_cred *cred = NULL;
1862         int status = -NFS4ERR_BAD_STATEID;
1863
1864         /* If a state reset has been done, test_stateid is unneeded */
1865         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1866                 return;
1867
1868         /* Get the delegation credential for use by test/free_stateid */
1869         rcu_read_lock();
1870         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1871         if (delegation != NULL &&
1872             nfs4_stateid_match(&delegation->stateid, stateid)) {
1873                 cred = get_rpccred(delegation->cred);
1874                 rcu_read_unlock();
1875                 status = nfs41_test_stateid(server, stateid, cred);
1876         } else
1877                 rcu_read_unlock();
1878
1879         if (status != NFS_OK) {
1880                 /* Free the stateid unless the server explicitly
1881                  * informs us the stateid is unrecognized. */
1882                 if (status != -NFS4ERR_BAD_STATEID)
1883                         nfs41_free_stateid(server, stateid, cred);
1884                 nfs_remove_bad_delegation(state->inode);
1885
1886                 write_seqlock(&state->seqlock);
1887                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1888                 write_sequnlock(&state->seqlock);
1889                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1890         }
1891
1892         if (cred != NULL)
1893                 put_rpccred(cred);
1894 }
1895
1896 /**
1897  * nfs41_check_open_stateid - possibly free an open stateid
1898  *
1899  * @state: NFSv4 state for an inode
1900  *
1901  * Returns NFS_OK if recovery for this stateid is now finished.
1902  * Otherwise a negative NFS4ERR value is returned.
1903  */
1904 static int nfs41_check_open_stateid(struct nfs4_state *state)
1905 {
1906         struct nfs_server *server = NFS_SERVER(state->inode);
1907         nfs4_stateid *stateid = &state->open_stateid;
1908         struct rpc_cred *cred = state->owner->so_cred;
1909         int status;
1910
1911         /* If a state reset has been done, test_stateid is unneeded */
1912         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1913             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1914             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1915                 return -NFS4ERR_BAD_STATEID;
1916
1917         status = nfs41_test_stateid(server, stateid, cred);
1918         if (status != NFS_OK) {
1919                 /* Free the stateid unless the server explicitly
1920                  * informs us the stateid is unrecognized. */
1921                 if (status != -NFS4ERR_BAD_STATEID)
1922                         nfs41_free_stateid(server, stateid, cred);
1923
1924                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1925                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1926                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1927                 clear_bit(NFS_OPEN_STATE, &state->flags);
1928         }
1929         return status;
1930 }
1931
1932 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1933 {
1934         int status;
1935
1936         nfs41_clear_delegation_stateid(state);
1937         status = nfs41_check_open_stateid(state);
1938         if (status != NFS_OK)
1939                 status = nfs4_open_expired(sp, state);
1940         return status;
1941 }
1942 #endif
1943
1944 /*
1945  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1946  * fields corresponding to attributes that were used to store the verifier.
1947  * Make sure we clobber those fields in the later setattr call
1948  */
1949 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1950 {
1951         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1952             !(sattr->ia_valid & ATTR_ATIME_SET))
1953                 sattr->ia_valid |= ATTR_ATIME;
1954
1955         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1956             !(sattr->ia_valid & ATTR_MTIME_SET))
1957                 sattr->ia_valid |= ATTR_MTIME;
1958 }
1959
1960 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1961                 fmode_t fmode,
1962                 int flags,
1963                 struct nfs_open_context *ctx)
1964 {
1965         struct nfs4_state_owner *sp = opendata->owner;
1966         struct nfs_server *server = sp->so_server;
1967         struct dentry *dentry;
1968         struct nfs4_state *state;
1969         unsigned int seq;
1970         int ret;
1971
1972         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1973
1974         ret = _nfs4_proc_open(opendata);
1975         if (ret != 0)
1976                 goto out;
1977
1978         state = nfs4_opendata_to_nfs4_state(opendata);
1979         ret = PTR_ERR(state);
1980         if (IS_ERR(state))
1981                 goto out;
1982         if (server->caps & NFS_CAP_POSIX_LOCK)
1983                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1984
1985         dentry = opendata->dentry;
1986         if (dentry->d_inode == NULL) {
1987                 /* FIXME: Is this d_drop() ever needed? */
1988                 d_drop(dentry);
1989                 dentry = d_add_unique(dentry, igrab(state->inode));
1990                 if (dentry == NULL) {
1991                         dentry = opendata->dentry;
1992                 } else if (dentry != ctx->dentry) {
1993                         dput(ctx->dentry);
1994                         ctx->dentry = dget(dentry);
1995                 }
1996                 nfs_set_verifier(dentry,
1997                                 nfs_save_change_attribute(opendata->dir->d_inode));
1998         }
1999
2000         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2001         if (ret != 0)
2002                 goto out;
2003
2004         ctx->state = state;
2005         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2006                 nfs4_schedule_stateid_recovery(server, state);
2007 out:
2008         return ret;
2009 }
2010
2011 /*
2012  * Returns a referenced nfs4_state
2013  */
2014 static int _nfs4_do_open(struct inode *dir,
2015                         struct nfs_open_context *ctx,
2016                         int flags,
2017                         struct iattr *sattr)
2018 {
2019         struct nfs4_state_owner  *sp;
2020         struct nfs4_state     *state = NULL;
2021         struct nfs_server       *server = NFS_SERVER(dir);
2022         struct nfs4_opendata *opendata;
2023         struct dentry *dentry = ctx->dentry;
2024         struct rpc_cred *cred = ctx->cred;
2025         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2026         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2027         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2028         int status;
2029
2030         /* Protect against reboot recovery conflicts */
2031         status = -ENOMEM;
2032         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2033         if (sp == NULL) {
2034                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2035                 goto out_err;
2036         }
2037         status = nfs4_recover_expired_lease(server);
2038         if (status != 0)
2039                 goto err_put_state_owner;
2040         if (dentry->d_inode != NULL)
2041                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2042         status = -ENOMEM;
2043         if (dentry->d_inode)
2044                 claim = NFS4_OPEN_CLAIM_FH;
2045         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2046                         claim, GFP_KERNEL);
2047         if (opendata == NULL)
2048                 goto err_put_state_owner;
2049
2050         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2051                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2052                 if (!opendata->f_attr.mdsthreshold)
2053                         goto err_opendata_put;
2054                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2055         }
2056         if (dentry->d_inode != NULL)
2057                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2058
2059         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2060         if (status != 0)
2061                 goto err_opendata_put;
2062         state = ctx->state;
2063
2064         if ((opendata->o_arg.open_flags & O_EXCL) &&
2065             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2066                 nfs4_exclusive_attrset(opendata, sattr);
2067
2068                 nfs_fattr_init(opendata->o_res.f_attr);
2069                 status = nfs4_do_setattr(state->inode, cred,
2070                                 opendata->o_res.f_attr, sattr,
2071                                 state);
2072                 if (status == 0)
2073                         nfs_setattr_update_inode(state->inode, sattr);
2074                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2075         }
2076
2077         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2078                 *ctx_th = opendata->f_attr.mdsthreshold;
2079         else
2080                 kfree(opendata->f_attr.mdsthreshold);
2081         opendata->f_attr.mdsthreshold = NULL;
2082
2083         nfs4_opendata_put(opendata);
2084         nfs4_put_state_owner(sp);
2085         return 0;
2086 err_opendata_put:
2087         kfree(opendata->f_attr.mdsthreshold);
2088         nfs4_opendata_put(opendata);
2089 err_put_state_owner:
2090         nfs4_put_state_owner(sp);
2091 out_err:
2092         return status;
2093 }
2094
2095
2096 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2097                                         struct nfs_open_context *ctx,
2098                                         int flags,
2099                                         struct iattr *sattr)
2100 {
2101         struct nfs_server *server = NFS_SERVER(dir);
2102         struct nfs4_exception exception = { };
2103         struct nfs4_state *res;
2104         int status;
2105
2106         do {
2107                 status = _nfs4_do_open(dir, ctx, flags, sattr);
2108                 res = ctx->state;
2109                 if (status == 0)
2110                         break;
2111                 /* NOTE: BAD_SEQID means the server and client disagree about the
2112                  * book-keeping w.r.t. state-changing operations
2113                  * (OPEN/CLOSE/LOCK/LOCKU...)
2114                  * It is actually a sign of a bug on the client or on the server.
2115                  *
2116                  * If we receive a BAD_SEQID error in the particular case of
2117                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2118                  * have unhashed the old state_owner for us, and that we can
2119                  * therefore safely retry using a new one. We should still warn
2120                  * the user though...
2121                  */
2122                 if (status == -NFS4ERR_BAD_SEQID) {
2123                         pr_warn_ratelimited("NFS: v4 server %s "
2124                                         " returned a bad sequence-id error!\n",
2125                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2126                         exception.retry = 1;
2127                         continue;
2128                 }
2129                 /*
2130                  * BAD_STATEID on OPEN means that the server cancelled our
2131                  * state before it received the OPEN_CONFIRM.
2132                  * Recover by retrying the request as per the discussion
2133                  * on Page 181 of RFC3530.
2134                  */
2135                 if (status == -NFS4ERR_BAD_STATEID) {
2136                         exception.retry = 1;
2137                         continue;
2138                 }
2139                 if (status == -EAGAIN) {
2140                         /* We must have found a delegation */
2141                         exception.retry = 1;
2142                         continue;
2143                 }
2144                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2145                         continue;
2146                 res = ERR_PTR(nfs4_handle_exception(server,
2147                                         status, &exception));
2148         } while (exception.retry);
2149         return res;
2150 }
2151
2152 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2153                             struct nfs_fattr *fattr, struct iattr *sattr,
2154                             struct nfs4_state *state)
2155 {
2156         struct nfs_server *server = NFS_SERVER(inode);
2157         struct nfs_setattrargs  arg = {
2158                 .fh             = NFS_FH(inode),
2159                 .iap            = sattr,
2160                 .server         = server,
2161                 .bitmask = server->attr_bitmask,
2162         };
2163         struct nfs_setattrres  res = {
2164                 .fattr          = fattr,
2165                 .server         = server,
2166         };
2167         struct rpc_message msg = {
2168                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2169                 .rpc_argp       = &arg,
2170                 .rpc_resp       = &res,
2171                 .rpc_cred       = cred,
2172         };
2173         unsigned long timestamp = jiffies;
2174         fmode_t fmode;
2175         bool truncate;
2176         int status;
2177
2178         nfs_fattr_init(fattr);
2179
2180         /* Servers should only apply open mode checks for file size changes */
2181         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2182         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2183
2184         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2185                 /* Use that stateid */
2186         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2187                 struct nfs_lockowner lockowner = {
2188                         .l_owner = current->files,
2189                         .l_pid = current->tgid,
2190                 };
2191                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2192                                 &lockowner);
2193         } else
2194                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2195
2196         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2197         if (status == 0 && state != NULL)
2198                 renew_lease(server, timestamp);
2199         return status;
2200 }
2201
2202 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2203                            struct nfs_fattr *fattr, struct iattr *sattr,
2204                            struct nfs4_state *state)
2205 {
2206         struct nfs_server *server = NFS_SERVER(inode);
2207         struct nfs4_exception exception = {
2208                 .state = state,
2209                 .inode = inode,
2210         };
2211         int err;
2212         do {
2213                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2214                 switch (err) {
2215                 case -NFS4ERR_OPENMODE:
2216                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2217                                 pr_warn_once("NFSv4: server %s is incorrectly "
2218                                                 "applying open mode checks to "
2219                                                 "a SETATTR that is not "
2220                                                 "changing file size.\n",
2221                                                 server->nfs_client->cl_hostname);
2222                         }
2223                         if (state && !(state->state & FMODE_WRITE)) {
2224                                 err = -EBADF;
2225                                 if (sattr->ia_valid & ATTR_OPEN)
2226                                         err = -EACCES;
2227                                 goto out;
2228                         }
2229                 }
2230                 err = nfs4_handle_exception(server, err, &exception);
2231         } while (exception.retry);
2232 out:
2233         return err;
2234 }
2235
2236 struct nfs4_closedata {
2237         struct inode *inode;
2238         struct nfs4_state *state;
2239         struct nfs_closeargs arg;
2240         struct nfs_closeres res;
2241         struct nfs_fattr fattr;
2242         unsigned long timestamp;
2243         bool roc;
2244         u32 roc_barrier;
2245 };
2246
2247 static void nfs4_free_closedata(void *data)
2248 {
2249         struct nfs4_closedata *calldata = data;
2250         struct nfs4_state_owner *sp = calldata->state->owner;
2251         struct super_block *sb = calldata->state->inode->i_sb;
2252
2253         if (calldata->roc)
2254                 pnfs_roc_release(calldata->state->inode);
2255         nfs4_put_open_state(calldata->state);
2256         nfs_free_seqid(calldata->arg.seqid);
2257         nfs4_put_state_owner(sp);
2258         nfs_sb_deactive(sb);
2259         kfree(calldata);
2260 }
2261
2262 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2263                 fmode_t fmode)
2264 {
2265         spin_lock(&state->owner->so_lock);
2266         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2267         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2268         case FMODE_WRITE:
2269                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2270                 break;
2271         case FMODE_READ:
2272                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2273                 break;
2274         case 0:
2275                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2276                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2277                 clear_bit(NFS_OPEN_STATE, &state->flags);
2278         }
2279         spin_unlock(&state->owner->so_lock);
2280 }
2281
2282 static void nfs4_close_done(struct rpc_task *task, void *data)
2283 {
2284         struct nfs4_closedata *calldata = data;
2285         struct nfs4_state *state = calldata->state;
2286         struct nfs_server *server = NFS_SERVER(calldata->inode);
2287
2288         dprintk("%s: begin!\n", __func__);
2289         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2290                 return;
2291         /* hmm. we are done with the inode, and in the process of freeing
2292          * the state_owner. we keep this around to process errors
2293          */
2294         switch (task->tk_status) {
2295                 case 0:
2296                         if (calldata->roc)
2297                                 pnfs_roc_set_barrier(state->inode,
2298                                                      calldata->roc_barrier);
2299                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2300                         renew_lease(server, calldata->timestamp);
2301                         nfs4_close_clear_stateid_flags(state,
2302                                         calldata->arg.fmode);
2303                         break;
2304                 case -NFS4ERR_STALE_STATEID:
2305                 case -NFS4ERR_OLD_STATEID:
2306                 case -NFS4ERR_BAD_STATEID:
2307                 case -NFS4ERR_EXPIRED:
2308                         if (calldata->arg.fmode == 0)
2309                                 break;
2310                 default:
2311                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2312                                 rpc_restart_call_prepare(task);
2313         }
2314         nfs_release_seqid(calldata->arg.seqid);
2315         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2316         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2317 }
2318
2319 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2320 {
2321         struct nfs4_closedata *calldata = data;
2322         struct nfs4_state *state = calldata->state;
2323         struct inode *inode = calldata->inode;
2324         int call_close = 0;
2325
2326         dprintk("%s: begin!\n", __func__);
2327         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2328                 goto out_wait;
2329
2330         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2331         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2332         spin_lock(&state->owner->so_lock);
2333         /* Calculate the change in open mode */
2334         if (state->n_rdwr == 0) {
2335                 if (state->n_rdonly == 0) {
2336                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2337                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2338                         calldata->arg.fmode &= ~FMODE_READ;
2339                 }
2340                 if (state->n_wronly == 0) {
2341                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2342                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2343                         calldata->arg.fmode &= ~FMODE_WRITE;
2344                 }
2345         }
2346         if (!nfs4_valid_open_stateid(state))
2347                 call_close = 0;
2348         spin_unlock(&state->owner->so_lock);
2349
2350         if (!call_close) {
2351                 /* Note: exit _without_ calling nfs4_close_done */
2352                 goto out_no_action;
2353         }
2354
2355         if (calldata->arg.fmode == 0) {
2356                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2357                 if (calldata->roc &&
2358                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2359                         nfs_release_seqid(calldata->arg.seqid);
2360                         goto out_wait;
2361                     }
2362         }
2363
2364         nfs_fattr_init(calldata->res.fattr);
2365         calldata->timestamp = jiffies;
2366         if (nfs4_setup_sequence(NFS_SERVER(inode),
2367                                 &calldata->arg.seq_args,
2368                                 &calldata->res.seq_res,
2369                                 task) != 0)
2370                 nfs_release_seqid(calldata->arg.seqid);
2371         dprintk("%s: done!\n", __func__);
2372         return;
2373 out_no_action:
2374         task->tk_action = NULL;
2375 out_wait:
2376         nfs4_sequence_done(task, &calldata->res.seq_res);
2377 }
2378
2379 static const struct rpc_call_ops nfs4_close_ops = {
2380         .rpc_call_prepare = nfs4_close_prepare,
2381         .rpc_call_done = nfs4_close_done,
2382         .rpc_release = nfs4_free_closedata,
2383 };
2384
2385 /*
2386  * It is possible for data to be read/written from a mem-mapped file
2387  * after the sys_close call (which hits the vfs layer as a flush).
2388  * This means that we can't safely call nfsv4 close on a file until
2389  * the inode is cleared. This in turn means that we are not good
2390  * NFSv4 citizens - we do not indicate to the server to update the file's
2391  * share state even when we are done with one of the three share
2392  * stateid's in the inode.
2393  *
2394  * NOTE: Caller must be holding the sp->so_owner semaphore!
2395  */
2396 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2397 {
2398         struct nfs_server *server = NFS_SERVER(state->inode);
2399         struct nfs4_closedata *calldata;
2400         struct nfs4_state_owner *sp = state->owner;
2401         struct rpc_task *task;
2402         struct rpc_message msg = {
2403                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2404                 .rpc_cred = state->owner->so_cred,
2405         };
2406         struct rpc_task_setup task_setup_data = {
2407                 .rpc_client = server->client,
2408                 .rpc_message = &msg,
2409                 .callback_ops = &nfs4_close_ops,
2410                 .workqueue = nfsiod_workqueue,
2411                 .flags = RPC_TASK_ASYNC,
2412         };
2413         int status = -ENOMEM;
2414
2415         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2416         if (calldata == NULL)
2417                 goto out;
2418         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2419         calldata->inode = state->inode;
2420         calldata->state = state;
2421         calldata->arg.fh = NFS_FH(state->inode);
2422         calldata->arg.stateid = &state->open_stateid;
2423         /* Serialization for the sequence id */
2424         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2425         if (calldata->arg.seqid == NULL)
2426                 goto out_free_calldata;
2427         calldata->arg.fmode = 0;
2428         calldata->arg.bitmask = server->cache_consistency_bitmask;
2429         calldata->res.fattr = &calldata->fattr;
2430         calldata->res.seqid = calldata->arg.seqid;
2431         calldata->res.server = server;
2432         calldata->roc = pnfs_roc(state->inode);
2433         nfs_sb_active(calldata->inode->i_sb);
2434
2435         msg.rpc_argp = &calldata->arg;
2436         msg.rpc_resp = &calldata->res;
2437         task_setup_data.callback_data = calldata;
2438         task = rpc_run_task(&task_setup_data);
2439         if (IS_ERR(task))
2440                 return PTR_ERR(task);
2441         status = 0;
2442         if (wait)
2443                 status = rpc_wait_for_completion_task(task);
2444         rpc_put_task(task);
2445         return status;
2446 out_free_calldata:
2447         kfree(calldata);
2448 out:
2449         nfs4_put_open_state(state);
2450         nfs4_put_state_owner(sp);
2451         return status;
2452 }
2453
2454 static struct inode *
2455 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2456 {
2457         struct nfs4_state *state;
2458
2459         /* Protect against concurrent sillydeletes */
2460         state = nfs4_do_open(dir, ctx, open_flags, attr);
2461         if (IS_ERR(state))
2462                 return ERR_CAST(state);
2463         return state->inode;
2464 }
2465
2466 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2467 {
2468         if (ctx->state == NULL)
2469                 return;
2470         if (is_sync)
2471                 nfs4_close_sync(ctx->state, ctx->mode);
2472         else
2473                 nfs4_close_state(ctx->state, ctx->mode);
2474 }
2475
2476 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2477 {
2478         struct nfs4_server_caps_arg args = {
2479                 .fhandle = fhandle,
2480         };
2481         struct nfs4_server_caps_res res = {};
2482         struct rpc_message msg = {
2483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2484                 .rpc_argp = &args,
2485                 .rpc_resp = &res,
2486         };
2487         int status;
2488
2489         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2490         if (status == 0) {
2491                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2492                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2493                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2494                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2495                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2496                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2497                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2498                         server->caps |= NFS_CAP_ACLS;
2499                 if (res.has_links != 0)
2500                         server->caps |= NFS_CAP_HARDLINKS;
2501                 if (res.has_symlinks != 0)
2502                         server->caps |= NFS_CAP_SYMLINKS;
2503                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2504                         server->caps |= NFS_CAP_FILEID;
2505                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2506                         server->caps |= NFS_CAP_MODE;
2507                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2508                         server->caps |= NFS_CAP_NLINK;
2509                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2510                         server->caps |= NFS_CAP_OWNER;
2511                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2512                         server->caps |= NFS_CAP_OWNER_GROUP;
2513                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2514                         server->caps |= NFS_CAP_ATIME;
2515                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2516                         server->caps |= NFS_CAP_CTIME;
2517                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2518                         server->caps |= NFS_CAP_MTIME;
2519
2520                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2521                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2522                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2523                 server->acl_bitmask = res.acl_bitmask;
2524                 server->fh_expire_type = res.fh_expire_type;
2525         }
2526
2527         return status;
2528 }
2529
2530 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2531 {
2532         struct nfs4_exception exception = { };
2533         int err;
2534         do {
2535                 err = nfs4_handle_exception(server,
2536                                 _nfs4_server_capabilities(server, fhandle),
2537                                 &exception);
2538         } while (exception.retry);
2539         return err;
2540 }
2541
2542 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2543                 struct nfs_fsinfo *info)
2544 {
2545         struct nfs4_lookup_root_arg args = {
2546                 .bitmask = nfs4_fattr_bitmap,
2547         };
2548         struct nfs4_lookup_res res = {
2549                 .server = server,
2550                 .fattr = info->fattr,
2551                 .fh = fhandle,
2552         };
2553         struct rpc_message msg = {
2554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2555                 .rpc_argp = &args,
2556                 .rpc_resp = &res,
2557         };
2558
2559         nfs_fattr_init(info->fattr);
2560         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2561 }
2562
2563 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2564                 struct nfs_fsinfo *info)
2565 {
2566         struct nfs4_exception exception = { };
2567         int err;
2568         do {
2569                 err = _nfs4_lookup_root(server, fhandle, info);
2570                 switch (err) {
2571                 case 0:
2572                 case -NFS4ERR_WRONGSEC:
2573                         goto out;
2574                 default:
2575                         err = nfs4_handle_exception(server, err, &exception);
2576                 }
2577         } while (exception.retry);
2578 out:
2579         return err;
2580 }
2581
2582 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2583                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2584 {
2585         struct rpc_auth *auth;
2586         int ret;
2587
2588         auth = rpcauth_create(flavor, server->client);
2589         if (IS_ERR(auth)) {
2590                 ret = -EACCES;
2591                 goto out;
2592         }
2593         ret = nfs4_lookup_root(server, fhandle, info);
2594 out:
2595         return ret;
2596 }
2597
2598 /*
2599  * Retry pseudoroot lookup with various security flavors.  We do this when:
2600  *
2601  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2602  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2603  *
2604  * Returns zero on success, or a negative NFS4ERR value, or a
2605  * negative errno value.
2606  */
2607 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2608                               struct nfs_fsinfo *info)
2609 {
2610         /* Per 3530bis 15.33.5 */
2611         static const rpc_authflavor_t flav_array[] = {
2612                 RPC_AUTH_GSS_KRB5P,
2613                 RPC_AUTH_GSS_KRB5I,
2614                 RPC_AUTH_GSS_KRB5,
2615                 RPC_AUTH_UNIX,                  /* courtesy */
2616                 RPC_AUTH_NULL,
2617         };
2618         int status = -EPERM;
2619         size_t i;
2620
2621         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2622                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2623                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2624                         continue;
2625                 break;
2626         }
2627
2628         /*
2629          * -EACCESS could mean that the user doesn't have correct permissions
2630          * to access the mount.  It could also mean that we tried to mount
2631          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2632          * existing mount programs don't handle -EACCES very well so it should
2633          * be mapped to -EPERM instead.
2634          */
2635         if (status == -EACCES)
2636                 status = -EPERM;
2637         return status;
2638 }
2639
2640 static int nfs4_do_find_root_sec(struct nfs_server *server,
2641                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2642 {
2643         int mv = server->nfs_client->cl_minorversion;
2644         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2645 }
2646
2647 /**
2648  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2649  * @server: initialized nfs_server handle
2650  * @fhandle: we fill in the pseudo-fs root file handle
2651  * @info: we fill in an FSINFO struct
2652  *
2653  * Returns zero on success, or a negative errno.
2654  */
2655 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2656                          struct nfs_fsinfo *info)
2657 {
2658         int status;
2659
2660         status = nfs4_lookup_root(server, fhandle, info);
2661         if ((status == -NFS4ERR_WRONGSEC) &&
2662             !(server->flags & NFS_MOUNT_SECFLAVOUR))
2663                 status = nfs4_do_find_root_sec(server, fhandle, info);
2664
2665         if (status == 0)
2666                 status = nfs4_server_capabilities(server, fhandle);
2667         if (status == 0)
2668                 status = nfs4_do_fsinfo(server, fhandle, info);
2669
2670         return nfs4_map_errors(status);
2671 }
2672
2673 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2674                               struct nfs_fsinfo *info)
2675 {
2676         int error;
2677         struct nfs_fattr *fattr = info->fattr;
2678
2679         error = nfs4_server_capabilities(server, mntfh);
2680         if (error < 0) {
2681                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2682                 return error;
2683         }
2684
2685         error = nfs4_proc_getattr(server, mntfh, fattr);
2686         if (error < 0) {
2687                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2688                 return error;
2689         }
2690
2691         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2692             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2693                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2694
2695         return error;
2696 }
2697
2698 /*
2699  * Get locations and (maybe) other attributes of a referral.
2700  * Note that we'll actually follow the referral later when
2701  * we detect fsid mismatch in inode revalidation
2702  */
2703 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2704                              const struct qstr *name, struct nfs_fattr *fattr,
2705                              struct nfs_fh *fhandle)
2706 {
2707         int status = -ENOMEM;
2708         struct page *page = NULL;
2709         struct nfs4_fs_locations *locations = NULL;
2710
2711         page = alloc_page(GFP_KERNEL);
2712         if (page == NULL)
2713                 goto out;
2714         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2715         if (locations == NULL)
2716                 goto out;
2717
2718         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2719         if (status != 0)
2720                 goto out;
2721         /* Make sure server returned a different fsid for the referral */
2722         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2723                 dprintk("%s: server did not return a different fsid for"
2724                         " a referral at %s\n", __func__, name->name);
2725                 status = -EIO;
2726                 goto out;
2727         }
2728         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2729         nfs_fixup_referral_attributes(&locations->fattr);
2730
2731         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2732         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2733         memset(fhandle, 0, sizeof(struct nfs_fh));
2734 out:
2735         if (page)
2736                 __free_page(page);
2737         kfree(locations);
2738         return status;
2739 }
2740
2741 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2742 {
2743         struct nfs4_getattr_arg args = {
2744                 .fh = fhandle,
2745                 .bitmask = server->attr_bitmask,
2746         };
2747         struct nfs4_getattr_res res = {
2748                 .fattr = fattr,
2749                 .server = server,
2750         };
2751         struct rpc_message msg = {
2752                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2753                 .rpc_argp = &args,
2754                 .rpc_resp = &res,
2755         };
2756
2757         nfs_fattr_init(fattr);
2758         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2759 }
2760
2761 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2762 {
2763         struct nfs4_exception exception = { };
2764         int err;
2765         do {
2766                 err = nfs4_handle_exception(server,
2767                                 _nfs4_proc_getattr(server, fhandle, fattr),
2768                                 &exception);
2769         } while (exception.retry);
2770         return err;
2771 }
2772
2773 /*
2774  * The file is not closed if it is opened due to the a request to change
2775  * the size of the file. The open call will not be needed once the
2776  * VFS layer lookup-intents are implemented.
2777  *
2778  * Close is called when the inode is destroyed.
2779  * If we haven't opened the file for O_WRONLY, we
2780  * need to in the size_change case to obtain a stateid.
2781  *
2782  * Got race?
2783  * Because OPEN is always done by name in nfsv4, it is
2784  * possible that we opened a different file by the same
2785  * name.  We can recognize this race condition, but we
2786  * can't do anything about it besides returning an error.
2787  *
2788  * This will be fixed with VFS changes (lookup-intent).
2789  */
2790 static int
2791 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2792                   struct iattr *sattr)
2793 {
2794         struct inode *inode = dentry->d_inode;
2795         struct rpc_cred *cred = NULL;
2796         struct nfs4_state *state = NULL;
2797         int status;
2798
2799         if (pnfs_ld_layoutret_on_setattr(inode))
2800                 pnfs_commit_and_return_layout(inode);
2801
2802         nfs_fattr_init(fattr);
2803
2804         /* Deal with open(O_TRUNC) */
2805         if (sattr->ia_valid & ATTR_OPEN)
2806                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2807
2808         /* Optimization: if the end result is no change, don't RPC */
2809         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2810                 return 0;
2811
2812         /* Search for an existing open(O_WRITE) file */
2813         if (sattr->ia_valid & ATTR_FILE) {
2814                 struct nfs_open_context *ctx;
2815
2816                 ctx = nfs_file_open_context(sattr->ia_file);
2817                 if (ctx) {
2818                         cred = ctx->cred;
2819                         state = ctx->state;
2820                 }
2821         }
2822
2823         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2824         if (status == 0)
2825                 nfs_setattr_update_inode(inode, sattr);
2826         return status;
2827 }
2828
2829 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2830                 const struct qstr *name, struct nfs_fh *fhandle,
2831                 struct nfs_fattr *fattr)
2832 {
2833         struct nfs_server *server = NFS_SERVER(dir);
2834         int                    status;
2835         struct nfs4_lookup_arg args = {
2836                 .bitmask = server->attr_bitmask,
2837                 .dir_fh = NFS_FH(dir),
2838                 .name = name,
2839         };
2840         struct nfs4_lookup_res res = {
2841                 .server = server,
2842                 .fattr = fattr,
2843                 .fh = fhandle,
2844         };
2845         struct rpc_message msg = {
2846                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2847                 .rpc_argp = &args,
2848                 .rpc_resp = &res,
2849         };
2850
2851         nfs_fattr_init(fattr);
2852
2853         dprintk("NFS call  lookup %s\n", name->name);
2854         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2855         dprintk("NFS reply lookup: %d\n", status);
2856         return status;
2857 }
2858
2859 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2860 {
2861         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2862                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2863         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2864         fattr->nlink = 2;
2865 }
2866
2867 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2868                                    struct qstr *name, struct nfs_fh *fhandle,
2869                                    struct nfs_fattr *fattr)
2870 {
2871         struct nfs4_exception exception = { };
2872         struct rpc_clnt *client = *clnt;
2873         int err;
2874         do {
2875                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2876                 switch (err) {
2877                 case -NFS4ERR_BADNAME:
2878                         err = -ENOENT;
2879                         goto out;
2880                 case -NFS4ERR_MOVED:
2881                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2882                         goto out;
2883                 case -NFS4ERR_WRONGSEC:
2884                         err = -EPERM;
2885                         if (client != *clnt)
2886                                 goto out;
2887
2888                         client = nfs4_create_sec_client(client, dir, name);
2889                         if (IS_ERR(client))
2890                                 return PTR_ERR(client);
2891
2892                         exception.retry = 1;
2893                         break;
2894                 default:
2895                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2896                 }
2897         } while (exception.retry);
2898
2899 out:
2900         if (err == 0)
2901                 *clnt = client;
2902         else if (client != *clnt)
2903                 rpc_shutdown_client(client);
2904
2905         return err;
2906 }
2907
2908 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2909                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2910 {
2911         int status;
2912         struct rpc_clnt *client = NFS_CLIENT(dir);
2913
2914         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2915         if (client != NFS_CLIENT(dir)) {
2916                 rpc_shutdown_client(client);
2917                 nfs_fixup_secinfo_attributes(fattr);
2918         }
2919         return status;
2920 }
2921
2922 struct rpc_clnt *
2923 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2924                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2925 {
2926         int status;
2927         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2928
2929         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2930         if (status < 0) {
2931                 rpc_shutdown_client(client);
2932                 return ERR_PTR(status);
2933         }
2934         return client;
2935 }
2936
2937 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2938 {
2939         struct nfs_server *server = NFS_SERVER(inode);
2940         struct nfs4_accessargs args = {
2941                 .fh = NFS_FH(inode),
2942                 .bitmask = server->cache_consistency_bitmask,
2943         };
2944         struct nfs4_accessres res = {
2945                 .server = server,
2946         };
2947         struct rpc_message msg = {
2948                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2949                 .rpc_argp = &args,
2950                 .rpc_resp = &res,
2951                 .rpc_cred = entry->cred,
2952         };
2953         int mode = entry->mask;
2954         int status;
2955
2956         /*
2957          * Determine which access bits we want to ask for...
2958          */
2959         if (mode & MAY_READ)
2960                 args.access |= NFS4_ACCESS_READ;
2961         if (S_ISDIR(inode->i_mode)) {
2962                 if (mode & MAY_WRITE)
2963                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2964                 if (mode & MAY_EXEC)
2965                         args.access |= NFS4_ACCESS_LOOKUP;
2966         } else {
2967                 if (mode & MAY_WRITE)
2968                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2969                 if (mode & MAY_EXEC)
2970                         args.access |= NFS4_ACCESS_EXECUTE;
2971         }
2972
2973         res.fattr = nfs_alloc_fattr();
2974         if (res.fattr == NULL)
2975                 return -ENOMEM;
2976
2977         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2978         if (!status) {
2979                 nfs_access_set_mask(entry, res.access);
2980                 nfs_refresh_inode(inode, res.fattr);
2981         }
2982         nfs_free_fattr(res.fattr);
2983         return status;
2984 }
2985
2986 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2987 {
2988         struct nfs4_exception exception = { };
2989         int err;
2990         do {
2991                 err = nfs4_handle_exception(NFS_SERVER(inode),
2992                                 _nfs4_proc_access(inode, entry),
2993                                 &exception);
2994         } while (exception.retry);
2995         return err;
2996 }
2997
2998 /*
2999  * TODO: For the time being, we don't try to get any attributes
3000  * along with any of the zero-copy operations READ, READDIR,
3001  * READLINK, WRITE.
3002  *
3003  * In the case of the first three, we want to put the GETATTR
3004  * after the read-type operation -- this is because it is hard
3005  * to predict the length of a GETATTR response in v4, and thus
3006  * align the READ data correctly.  This means that the GETATTR
3007  * may end up partially falling into the page cache, and we should
3008  * shift it into the 'tail' of the xdr_buf before processing.
3009  * To do this efficiently, we need to know the total length
3010  * of data received, which doesn't seem to be available outside
3011  * of the RPC layer.
3012  *
3013  * In the case of WRITE, we also want to put the GETATTR after
3014  * the operation -- in this case because we want to make sure
3015  * we get the post-operation mtime and size.
3016  *
3017  * Both of these changes to the XDR layer would in fact be quite
3018  * minor, but I decided to leave them for a subsequent patch.
3019  */
3020 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3021                 unsigned int pgbase, unsigned int pglen)
3022 {
3023         struct nfs4_readlink args = {
3024                 .fh       = NFS_FH(inode),
3025                 .pgbase   = pgbase,
3026                 .pglen    = pglen,
3027                 .pages    = &page,
3028         };
3029         struct nfs4_readlink_res res;
3030         struct rpc_message msg = {
3031                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3032                 .rpc_argp = &args,
3033                 .rpc_resp = &res,
3034         };
3035
3036         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3037 }
3038
3039 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3040                 unsigned int pgbase, unsigned int pglen)
3041 {
3042         struct nfs4_exception exception = { };
3043         int err;
3044         do {
3045                 err = nfs4_handle_exception(NFS_SERVER(inode),
3046                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
3047                                 &exception);
3048         } while (exception.retry);
3049         return err;
3050 }
3051
3052 /*
3053  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3054  */
3055 static int
3056 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3057                  int flags)
3058 {
3059         struct nfs_open_context *ctx;
3060         struct nfs4_state *state;
3061         int status = 0;
3062
3063         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3064         if (IS_ERR(ctx))
3065                 return PTR_ERR(ctx);
3066
3067         sattr->ia_mode &= ~current_umask();
3068         state = nfs4_do_open(dir, ctx, flags, sattr);
3069         if (IS_ERR(state)) {
3070                 status = PTR_ERR(state);
3071                 goto out;
3072         }
3073 out:
3074         put_nfs_open_context(ctx);
3075         return status;
3076 }
3077
3078 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3079 {
3080         struct nfs_server *server = NFS_SERVER(dir);
3081         struct nfs_removeargs args = {
3082                 .fh = NFS_FH(dir),
3083                 .name = *name,
3084         };
3085         struct nfs_removeres res = {
3086                 .server = server,
3087         };
3088         struct rpc_message msg = {
3089                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3090                 .rpc_argp = &args,
3091                 .rpc_resp = &res,
3092         };
3093         int status;
3094
3095         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3096         if (status == 0)
3097                 update_changeattr(dir, &res.cinfo);
3098         return status;
3099 }
3100
3101 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3102 {
3103         struct nfs4_exception exception = { };
3104         int err;
3105         do {
3106                 err = nfs4_handle_exception(NFS_SERVER(dir),
3107                                 _nfs4_proc_remove(dir, name),
3108                                 &exception);
3109         } while (exception.retry);
3110         return err;
3111 }
3112
3113 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3114 {
3115         struct nfs_server *server = NFS_SERVER(dir);
3116         struct nfs_removeargs *args = msg->rpc_argp;
3117         struct nfs_removeres *res = msg->rpc_resp;
3118
3119         res->server = server;
3120         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3121         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3122 }
3123
3124 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3125 {
3126         nfs4_setup_sequence(NFS_SERVER(data->dir),
3127                         &data->args.seq_args,
3128                         &data->res.seq_res,
3129                         task);
3130 }
3131
3132 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3133 {
3134         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3135
3136         if (!nfs4_sequence_done(task, &res->seq_res))
3137                 return 0;
3138         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3139                 return 0;
3140         update_changeattr(dir, &res->cinfo);
3141         return 1;
3142 }
3143
3144 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3145 {
3146         struct nfs_server *server = NFS_SERVER(dir);
3147         struct nfs_renameargs *arg = msg->rpc_argp;
3148         struct nfs_renameres *res = msg->rpc_resp;
3149
3150         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3151         res->server = server;
3152         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3153 }
3154
3155 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3156 {
3157         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3158                         &data->args.seq_args,
3159                         &data->res.seq_res,
3160                         task);
3161 }
3162
3163 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3164                                  struct inode *new_dir)
3165 {
3166         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3167
3168         if (!nfs4_sequence_done(task, &res->seq_res))
3169                 return 0;
3170         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3171                 return 0;
3172
3173         update_changeattr(old_dir, &res->old_cinfo);
3174         update_changeattr(new_dir, &res->new_cinfo);
3175         return 1;
3176 }
3177
3178 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3179                 struct inode *new_dir, struct qstr *new_name)
3180 {
3181         struct nfs_server *server = NFS_SERVER(old_dir);
3182         struct nfs_renameargs arg = {
3183                 .old_dir = NFS_FH(old_dir),
3184                 .new_dir = NFS_FH(new_dir),
3185                 .old_name = old_name,
3186                 .new_name = new_name,
3187         };
3188         struct nfs_renameres res = {
3189                 .server = server,
3190         };
3191         struct rpc_message msg = {
3192                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3193                 .rpc_argp = &arg,
3194                 .rpc_resp = &res,
3195         };
3196         int status = -ENOMEM;
3197
3198         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3199         if (!status) {
3200                 update_changeattr(old_dir, &res.old_cinfo);
3201                 update_changeattr(new_dir, &res.new_cinfo);
3202         }
3203         return status;
3204 }
3205
3206 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3207                 struct inode *new_dir, struct qstr *new_name)
3208 {
3209         struct nfs4_exception exception = { };
3210         int err;
3211         do {
3212                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3213                                 _nfs4_proc_rename(old_dir, old_name,
3214                                         new_dir, new_name),
3215                                 &exception);
3216         } while (exception.retry);
3217         return err;
3218 }
3219
3220 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3221 {
3222         struct nfs_server *server = NFS_SERVER(inode);
3223         struct nfs4_link_arg arg = {
3224                 .fh     = NFS_FH(inode),
3225                 .dir_fh = NFS_FH(dir),
3226                 .name   = name,
3227                 .bitmask = server->attr_bitmask,
3228         };
3229         struct nfs4_link_res res = {
3230                 .server = server,
3231         };
3232         struct rpc_message msg = {
3233                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3234                 .rpc_argp = &arg,
3235                 .rpc_resp = &res,
3236         };
3237         int status = -ENOMEM;
3238
3239         res.fattr = nfs_alloc_fattr();
3240         if (res.fattr == NULL)
3241                 goto out;
3242
3243         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3244         if (!status) {
3245                 update_changeattr(dir, &res.cinfo);
3246                 nfs_post_op_update_inode(inode, res.fattr);
3247         }
3248 out:
3249         nfs_free_fattr(res.fattr);
3250         return status;
3251 }
3252
3253 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3254 {
3255         struct nfs4_exception exception = { };
3256         int err;
3257         do {
3258                 err = nfs4_handle_exception(NFS_SERVER(inode),
3259                                 _nfs4_proc_link(inode, dir, name),
3260                                 &exception);
3261         } while (exception.retry);
3262         return err;
3263 }
3264
3265 struct nfs4_createdata {
3266         struct rpc_message msg;
3267         struct nfs4_create_arg arg;
3268         struct nfs4_create_res res;
3269         struct nfs_fh fh;
3270         struct nfs_fattr fattr;
3271 };
3272
3273 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3274                 struct qstr *name, struct iattr *sattr, u32 ftype)
3275 {
3276         struct nfs4_createdata *data;
3277
3278         data = kzalloc(sizeof(*data), GFP_KERNEL);
3279         if (data != NULL) {
3280                 struct nfs_server *server = NFS_SERVER(dir);
3281
3282                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3283                 data->msg.rpc_argp = &data->arg;
3284                 data->msg.rpc_resp = &data->res;
3285                 data->arg.dir_fh = NFS_FH(dir);
3286                 data->arg.server = server;
3287                 data->arg.name = name;
3288                 data->arg.attrs = sattr;
3289                 data->arg.ftype = ftype;
3290                 data->arg.bitmask = server->attr_bitmask;
3291                 data->res.server = server;
3292                 data->res.fh = &data->fh;
3293                 data->res.fattr = &data->fattr;
3294                 nfs_fattr_init(data->res.fattr);
3295         }
3296         return data;
3297 }
3298
3299 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3300 {
3301         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3302                                     &data->arg.seq_args, &data->res.seq_res, 1);
3303         if (status == 0) {
3304                 update_changeattr(dir, &data->res.dir_cinfo);
3305                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3306         }
3307         return status;
3308 }
3309
3310 static void nfs4_free_createdata(struct nfs4_createdata *data)
3311 {
3312         kfree(data);
3313 }
3314
3315 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3316                 struct page *page, unsigned int len, struct iattr *sattr)
3317 {
3318         struct nfs4_createdata *data;
3319         int status = -ENAMETOOLONG;
3320
3321         if (len > NFS4_MAXPATHLEN)
3322                 goto out;
3323
3324         status = -ENOMEM;
3325         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3326         if (data == NULL)
3327                 goto out;
3328
3329         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3330         data->arg.u.symlink.pages = &page;
3331         data->arg.u.symlink.len = len;
3332
3333         status = nfs4_do_create(dir, dentry, data);
3334
3335         nfs4_free_createdata(data);
3336 out:
3337         return status;
3338 }
3339
3340 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3341                 struct page *page, unsigned int len, struct iattr *sattr)
3342 {
3343         struct nfs4_exception exception = { };
3344         int err;
3345         do {
3346                 err = nfs4_handle_exception(NFS_SERVER(dir),
3347                                 _nfs4_proc_symlink(dir, dentry, page,
3348                                                         len, sattr),
3349                                 &exception);
3350         } while (exception.retry);
3351         return err;
3352 }
3353
3354 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3355                 struct iattr *sattr)
3356 {
3357         struct nfs4_createdata *data;
3358         int status = -ENOMEM;
3359
3360         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3361         if (data == NULL)
3362                 goto out;
3363
3364         status = nfs4_do_create(dir, dentry, data);
3365
3366         nfs4_free_createdata(data);
3367 out:
3368         return status;
3369 }
3370
3371 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3372                 struct iattr *sattr)
3373 {
3374         struct nfs4_exception exception = { };
3375         int err;
3376
3377         sattr->ia_mode &= ~current_umask();
3378         do {
3379                 err = nfs4_handle_exception(NFS_SERVER(dir),
3380                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3381                                 &exception);
3382         } while (exception.retry);
3383         return err;
3384 }
3385
3386 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3387                 u64 cookie, struct page **pages, unsigned int count, int plus)
3388 {
3389         struct inode            *dir = dentry->d_inode;
3390         struct nfs4_readdir_arg args = {
3391                 .fh = NFS_FH(dir),
3392                 .pages = pages,
3393                 .pgbase = 0,
3394                 .count = count,
3395                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3396                 .plus = plus,
3397         };
3398         struct nfs4_readdir_res res;
3399         struct rpc_message msg = {
3400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3401                 .rpc_argp = &args,
3402                 .rpc_resp = &res,
3403                 .rpc_cred = cred,
3404         };
3405         int                     status;
3406
3407         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3408                         dentry->d_parent->d_name.name,
3409                         dentry->d_name.name,
3410                         (unsigned long long)cookie);
3411         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3412         res.pgbase = args.pgbase;
3413         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3414         if (status >= 0) {
3415                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3416                 status += args.pgbase;
3417         }
3418
3419         nfs_invalidate_atime(dir);
3420
3421         dprintk("%s: returns %d\n", __func__, status);
3422         return status;
3423 }
3424
3425 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3426                 u64 cookie, struct page **pages, unsigned int count, int plus)
3427 {
3428         struct nfs4_exception exception = { };
3429         int err;
3430         do {
3431                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3432                                 _nfs4_proc_readdir(dentry, cred, cookie,
3433                                         pages, count, plus),
3434                                 &exception);
3435         } while (exception.retry);
3436         return err;
3437 }
3438
3439 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3440                 struct iattr *sattr, dev_t rdev)
3441 {
3442         struct nfs4_createdata *data;
3443         int mode = sattr->ia_mode;
3444         int status = -ENOMEM;
3445
3446         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3447         if (data == NULL)
3448                 goto out;
3449
3450         if (S_ISFIFO(mode))
3451                 data->arg.ftype = NF4FIFO;
3452         else if (S_ISBLK(mode)) {
3453                 data->arg.ftype = NF4BLK;
3454                 data->arg.u.device.specdata1 = MAJOR(rdev);
3455                 data->arg.u.device.specdata2 = MINOR(rdev);
3456         }
3457         else if (S_ISCHR(mode)) {
3458                 data->arg.ftype = NF4CHR;
3459                 data->arg.u.device.specdata1 = MAJOR(rdev);
3460                 data->arg.u.device.specdata2 = MINOR(rdev);
3461         } else if (!S_ISSOCK(mode)) {
3462                 status = -EINVAL;
3463                 goto out_free;
3464         }
3465
3466         status = nfs4_do_create(dir, dentry, data);
3467 out_free:
3468         nfs4_free_createdata(data);
3469 out:
3470         return status;
3471 }
3472
3473 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3474                 struct iattr *sattr, dev_t rdev)
3475 {
3476         struct nfs4_exception exception = { };
3477         int err;
3478
3479         sattr->ia_mode &= ~current_umask();
3480         do {
3481                 err = nfs4_handle_exception(NFS_SERVER(dir),
3482                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3483                                 &exception);
3484         } while (exception.retry);
3485         return err;
3486 }
3487
3488 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3489                  struct nfs_fsstat *fsstat)
3490 {
3491         struct nfs4_statfs_arg args = {
3492                 .fh = fhandle,
3493                 .bitmask = server->attr_bitmask,
3494         };
3495         struct nfs4_statfs_res res = {
3496                 .fsstat = fsstat,
3497         };
3498         struct rpc_message msg = {
3499                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3500                 .rpc_argp = &args,
3501                 .rpc_resp = &res,
3502         };
3503
3504         nfs_fattr_init(fsstat->fattr);
3505         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3506 }
3507
3508 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3509 {
3510         struct nfs4_exception exception = { };
3511         int err;
3512         do {
3513                 err = nfs4_handle_exception(server,
3514                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3515                                 &exception);
3516         } while (exception.retry);
3517         return err;
3518 }
3519
3520 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3521                 struct nfs_fsinfo *fsinfo)
3522 {
3523         struct nfs4_fsinfo_arg args = {
3524                 .fh = fhandle,
3525                 .bitmask = server->attr_bitmask,
3526         };
3527         struct nfs4_fsinfo_res res = {
3528                 .fsinfo = fsinfo,
3529         };
3530         struct rpc_message msg = {
3531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3532                 .rpc_argp = &args,
3533                 .rpc_resp = &res,
3534         };
3535
3536         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3537 }
3538
3539 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3540 {
3541         struct nfs4_exception exception = { };
3542         unsigned long now = jiffies;
3543         int err;
3544
3545         do {
3546                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3547                 if (err == 0) {
3548                         struct nfs_client *clp = server->nfs_client;
3549
3550                         spin_lock(&clp->cl_lock);
3551                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3552                         clp->cl_last_renewal = now;
3553                         spin_unlock(&clp->cl_lock);
3554                         break;
3555                 }
3556                 err = nfs4_handle_exception(server, err, &exception);
3557         } while (exception.retry);
3558         return err;
3559 }
3560
3561 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3562 {
3563         int error;
3564
3565         nfs_fattr_init(fsinfo->fattr);
3566         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3567         if (error == 0) {
3568                 /* block layout checks this! */
3569                 server->pnfs_blksize = fsinfo->blksize;
3570                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3571         }
3572
3573         return error;
3574 }
3575
3576 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3577                 struct nfs_pathconf *pathconf)
3578 {
3579         struct nfs4_pathconf_arg args = {
3580                 .fh = fhandle,
3581                 .bitmask = server->attr_bitmask,
3582         };
3583         struct nfs4_pathconf_res res = {
3584                 .pathconf = pathconf,
3585         };
3586         struct rpc_message msg = {
3587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3588                 .rpc_argp = &args,
3589                 .rpc_resp = &res,
3590         };
3591
3592         /* None of the pathconf attributes are mandatory to implement */
3593         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3594                 memset(pathconf, 0, sizeof(*pathconf));
3595                 return 0;
3596         }
3597
3598         nfs_fattr_init(pathconf->fattr);
3599         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3600 }
3601
3602 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3603                 struct nfs_pathconf *pathconf)
3604 {
3605         struct nfs4_exception exception = { };
3606         int err;
3607
3608         do {
3609                 err = nfs4_handle_exception(server,
3610                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3611                                 &exception);
3612         } while (exception.retry);
3613         return err;
3614 }
3615
3616 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3617                 const struct nfs_open_context *ctx,
3618                 const struct nfs_lock_context *l_ctx,
3619                 fmode_t fmode)
3620 {
3621         const struct nfs_lockowner *lockowner = NULL;
3622
3623         if (l_ctx != NULL)
3624                 lockowner = &l_ctx->lockowner;
3625         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3626 }
3627 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3628
3629 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3630                 const struct nfs_open_context *ctx,
3631                 const struct nfs_lock_context *l_ctx,
3632                 fmode_t fmode)
3633 {
3634         nfs4_stateid current_stateid;
3635
3636         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3637                 return false;
3638         return nfs4_stateid_match(stateid, &current_stateid);
3639 }
3640
3641 static bool nfs4_error_stateid_expired(int err)
3642 {
3643         switch (err) {
3644         case -NFS4ERR_DELEG_REVOKED:
3645         case -NFS4ERR_ADMIN_REVOKED:
3646         case -NFS4ERR_BAD_STATEID:
3647         case -NFS4ERR_STALE_STATEID:
3648         case -NFS4ERR_OLD_STATEID:
3649         case -NFS4ERR_OPENMODE:
3650         case -NFS4ERR_EXPIRED:
3651                 return true;
3652         }
3653         return false;
3654 }
3655
3656 void __nfs4_read_done_cb(struct nfs_read_data *data)
3657 {
3658         nfs_invalidate_atime(data->header->inode);
3659 }
3660
3661 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3662 {
3663         struct nfs_server *server = NFS_SERVER(data->header->inode);
3664
3665         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3666                 rpc_restart_call_prepare(task);
3667                 return -EAGAIN;
3668         }
3669
3670         __nfs4_read_done_cb(data);
3671         if (task->tk_status > 0)
3672                 renew_lease(server, data->timestamp);
3673         return 0;
3674 }
3675
3676 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3677                 struct nfs_readargs *args)
3678 {
3679
3680         if (!nfs4_error_stateid_expired(task->tk_status) ||
3681                 nfs4_stateid_is_current(&args->stateid,
3682                                 args->context,
3683                                 args->lock_context,
3684                                 FMODE_READ))
3685                 return false;
3686         rpc_restart_call_prepare(task);
3687         return true;
3688 }
3689
3690 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3691 {
3692
3693         dprintk("--> %s\n", __func__);
3694
3695         if (!nfs4_sequence_done(task, &data->res.seq_res))
3696                 return -EAGAIN;
3697         if (nfs4_read_stateid_changed(task, &data->args))
3698                 return -EAGAIN;
3699         return data->read_done_cb ? data->read_done_cb(task, data) :
3700                                     nfs4_read_done_cb(task, data);
3701 }
3702
3703 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3704 {
3705         data->timestamp   = jiffies;
3706         data->read_done_cb = nfs4_read_done_cb;
3707         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3708         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3709 }
3710
3711 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3712 {
3713         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3714                         &data->args.seq_args,
3715                         &data->res.seq_res,
3716                         task))
3717                 return;
3718         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3719                         data->args.lock_context, FMODE_READ);
3720 }
3721
3722 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3723 {
3724         struct inode *inode = data->header->inode;
3725
3726         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3727                 rpc_restart_call_prepare(task);
3728                 return -EAGAIN;
3729         }
3730         if (task->tk_status >= 0) {
3731                 renew_lease(NFS_SERVER(inode), data->timestamp);
3732                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3733         }
3734         return 0;
3735 }
3736
3737 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3738                 struct nfs_writeargs *args)
3739 {
3740
3741         if (!nfs4_error_stateid_expired(task->tk_status) ||
3742                 nfs4_stateid_is_current(&args->stateid,
3743                                 args->context,
3744                                 args->lock_context,
3745                                 FMODE_WRITE))
3746                 return false;
3747         rpc_restart_call_prepare(task);
3748         return true;
3749 }
3750
3751 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3752 {
3753         if (!nfs4_sequence_done(task, &data->res.seq_res))
3754                 return -EAGAIN;
3755         if (nfs4_write_stateid_changed(task, &data->args))
3756                 return -EAGAIN;
3757         return data->write_done_cb ? data->write_done_cb(task, data) :
3758                 nfs4_write_done_cb(task, data);
3759 }
3760
3761 static
3762 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3763 {
3764         const struct nfs_pgio_header *hdr = data->header;
3765
3766         /* Don't request attributes for pNFS or O_DIRECT writes */
3767         if (data->ds_clp != NULL || hdr->dreq != NULL)
3768                 return false;
3769         /* Otherwise, request attributes if and only if we don't hold
3770          * a delegation
3771          */
3772         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3773 }
3774
3775 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3776 {
3777         struct nfs_server *server = NFS_SERVER(data->header->inode);
3778
3779         if (!nfs4_write_need_cache_consistency_data(data)) {
3780                 data->args.bitmask = NULL;
3781                 data->res.fattr = NULL;
3782         } else
3783                 data->args.bitmask = server->cache_consistency_bitmask;
3784
3785         if (!data->write_done_cb)
3786                 data->write_done_cb = nfs4_write_done_cb;
3787         data->res.server = server;
3788         data->timestamp   = jiffies;
3789
3790         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3791         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3792 }
3793
3794 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3795 {
3796         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3797                         &data->args.seq_args,
3798                         &data->res.seq_res,
3799                         task))
3800                 return;
3801         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3802                         data->args.lock_context, FMODE_WRITE);
3803 }
3804
3805 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3806 {
3807         nfs4_setup_sequence(NFS_SERVER(data->inode),
3808                         &data->args.seq_args,
3809                         &data->res.seq_res,
3810                         task);
3811 }
3812
3813 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3814 {
3815         struct inode *inode = data->inode;
3816
3817         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3818                 rpc_restart_call_prepare(task);
3819                 return -EAGAIN;
3820         }
3821         return 0;
3822 }
3823
3824 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3825 {
3826         if (!nfs4_sequence_done(task, &data->res.seq_res))
3827                 return -EAGAIN;
3828         return data->commit_done_cb(task, data);
3829 }
3830
3831 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3832 {
3833         struct nfs_server *server = NFS_SERVER(data->inode);
3834
3835         if (data->commit_done_cb == NULL)
3836                 data->commit_done_cb = nfs4_commit_done_cb;
3837         data->res.server = server;
3838         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3839         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3840 }
3841
3842 struct nfs4_renewdata {
3843         struct nfs_client       *client;
3844         unsigned long           timestamp;
3845 };
3846
3847 /*
3848  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3849  * standalone procedure for queueing an asynchronous RENEW.
3850  */
3851 static void nfs4_renew_release(void *calldata)
3852 {
3853         struct nfs4_renewdata *data = calldata;
3854         struct nfs_client *clp = data->client;
3855
3856         if (atomic_read(&clp->cl_count) > 1)
3857                 nfs4_schedule_state_renewal(clp);
3858         nfs_put_client(clp);
3859         kfree(data);
3860 }
3861
3862 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3863 {
3864         struct nfs4_renewdata *data = calldata;
3865         struct nfs_client *clp = data->client;
3866         unsigned long timestamp = data->timestamp;
3867
3868         if (task->tk_status < 0) {
3869                 /* Unless we're shutting down, schedule state recovery! */
3870                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3871                         return;
3872                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3873                         nfs4_schedule_lease_recovery(clp);
3874                         return;
3875                 }
3876                 nfs4_schedule_path_down_recovery(clp);
3877         }
3878         do_renew_lease(clp, timestamp);
3879 }
3880
3881 static const struct rpc_call_ops nfs4_renew_ops = {
3882         .rpc_call_done = nfs4_renew_done,
3883         .rpc_release = nfs4_renew_release,
3884 };
3885
3886 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3887 {
3888         struct rpc_message msg = {
3889                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3890                 .rpc_argp       = clp,
3891                 .rpc_cred       = cred,
3892         };
3893         struct nfs4_renewdata *data;
3894
3895         if (renew_flags == 0)
3896                 return 0;
3897         if (!atomic_inc_not_zero(&clp->cl_count))
3898                 return -EIO;
3899         data = kmalloc(sizeof(*data), GFP_NOFS);
3900         if (data == NULL)
3901                 return -ENOMEM;
3902         data->client = clp;
3903         data->timestamp = jiffies;
3904         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
3905                         &nfs4_renew_ops, data);
3906 }
3907
3908 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3909 {
3910         struct rpc_message msg = {
3911                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3912                 .rpc_argp       = clp,
3913                 .rpc_cred       = cred,
3914         };
3915         unsigned long now = jiffies;
3916         int status;
3917
3918         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3919         if (status < 0)
3920                 return status;
3921         do_renew_lease(clp, now);
3922         return 0;
3923 }
3924
3925 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3926 {
3927         return (server->caps & NFS_CAP_ACLS)
3928                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3929                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3930 }
3931
3932 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3933  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3934  * the stack.
3935  */
3936 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3937
3938 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3939                 struct page **pages, unsigned int *pgbase)
3940 {
3941         struct page *newpage, **spages;
3942         int rc = 0;
3943         size_t len;
3944         spages = pages;
3945
3946         do {
3947                 len = min_t(size_t, PAGE_SIZE, buflen);
3948                 newpage = alloc_page(GFP_KERNEL);
3949
3950                 if (newpage == NULL)
3951                         goto unwind;
3952                 memcpy(page_address(newpage), buf, len);
3953                 buf += len;
3954                 buflen -= len;
3955                 *pages++ = newpage;
3956                 rc++;
3957         } while (buflen != 0);
3958
3959         return rc;
3960
3961 unwind:
3962         for(; rc > 0; rc--)
3963                 __free_page(spages[rc-1]);
3964         return -ENOMEM;
3965 }
3966
3967 struct nfs4_cached_acl {
3968         int cached;
3969         size_t len;
3970         char data[0];
3971 };
3972
3973 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3974 {
3975         struct nfs_inode *nfsi = NFS_I(inode);
3976
3977         spin_lock(&inode->i_lock);
3978         kfree(nfsi->nfs4_acl);
3979         nfsi->nfs4_acl = acl;
3980         spin_unlock(&inode->i_lock);
3981 }
3982
3983 static void nfs4_zap_acl_attr(struct inode *inode)
3984 {
3985         nfs4_set_cached_acl(inode, NULL);
3986 }
3987
3988 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3989 {
3990         struct nfs_inode *nfsi = NFS_I(inode);
3991         struct nfs4_cached_acl *acl;
3992         int ret = -ENOENT;
3993
3994         spin_lock(&inode->i_lock);
3995         acl = nfsi->nfs4_acl;
3996         if (acl == NULL)
3997                 goto out;
3998         if (buf == NULL) /* user is just asking for length */
3999                 goto out_len;
4000         if (acl->cached == 0)
4001                 goto out;
4002         ret = -ERANGE; /* see getxattr(2) man page */
4003         if (acl->len > buflen)
4004                 goto out;
4005         memcpy(buf, acl->data, acl->len);
4006 out_len:
4007         ret = acl->len;
4008 out:
4009         spin_unlock(&inode->i_lock);
4010         return ret;
4011 }
4012
4013 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4014 {
4015         struct nfs4_cached_acl *acl;
4016         size_t buflen = sizeof(*acl) + acl_len;
4017
4018         if (buflen <= PAGE_SIZE) {
4019                 acl = kmalloc(buflen, GFP_KERNEL);
4020                 if (acl == NULL)
4021                         goto out;
4022                 acl->cached = 1;
4023                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4024         } else {
4025                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4026                 if (acl == NULL)
4027                         goto out;
4028                 acl->cached = 0;
4029         }
4030         acl->len = acl_len;
4031 out:
4032         nfs4_set_cached_acl(inode, acl);
4033 }
4034
4035 /*
4036  * The getxattr API returns the required buffer length when called with a
4037  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4038  * the required buf.  On a NULL buf, we send a page of data to the server
4039  * guessing that the ACL request can be serviced by a page. If so, we cache
4040  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4041  * the cache. If not so, we throw away the page, and cache the required
4042  * length. The next getxattr call will then produce another round trip to
4043  * the server, this time with the input buf of the required size.
4044  */
4045 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4046 {
4047         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4048         struct nfs_getaclargs args = {
4049                 .fh = NFS_FH(inode),
4050                 .acl_pages = pages,
4051                 .acl_len = buflen,
4052         };
4053         struct nfs_getaclres res = {
4054                 .acl_len = buflen,
4055         };
4056         struct rpc_message msg = {
4057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4058                 .rpc_argp = &args,
4059                 .rpc_resp = &res,
4060         };
4061         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4062         int ret = -ENOMEM, i;
4063
4064         /* As long as we're doing a round trip to the server anyway,
4065          * let's be prepared for a page of acl data. */
4066         if (npages == 0)
4067                 npages = 1;
4068         if (npages > ARRAY_SIZE(pages))
4069                 return -ERANGE;
4070
4071         for (i = 0; i < npages; i++) {
4072                 pages[i] = alloc_page(GFP_KERNEL);
4073                 if (!pages[i])
4074                         goto out_free;
4075         }
4076
4077         /* for decoding across pages */
4078         res.acl_scratch = alloc_page(GFP_KERNEL);
4079         if (!res.acl_scratch)
4080                 goto out_free;
4081
4082         args.acl_len = npages * PAGE_SIZE;
4083         args.acl_pgbase = 0;
4084
4085         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4086                 __func__, buf, buflen, npages, args.acl_len);
4087         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4088                              &msg, &args.seq_args, &res.seq_res, 0);
4089         if (ret)
4090                 goto out_free;
4091
4092         /* Handle the case where the passed-in buffer is too short */
4093         if (res.acl_flags & NFS4_ACL_TRUNC) {
4094                 /* Did the user only issue a request for the acl length? */
4095                 if (buf == NULL)
4096                         goto out_ok;
4097                 ret = -ERANGE;
4098                 goto out_free;
4099         }
4100         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4101         if (buf) {
4102                 if (res.acl_len > buflen) {
4103                         ret = -ERANGE;
4104                         goto out_free;
4105                 }
4106                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4107         }
4108 out_ok:
4109         ret = res.acl_len;
4110 out_free:
4111         for (i = 0; i < npages; i++)
4112                 if (pages[i])
4113                         __free_page(pages[i]);
4114         if (res.acl_scratch)
4115                 __free_page(res.acl_scratch);
4116         return ret;
4117 }
4118
4119 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4120 {
4121         struct nfs4_exception exception = { };
4122         ssize_t ret;
4123         do {
4124                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4125                 if (ret >= 0)
4126                         break;
4127                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4128         } while (exception.retry);
4129         return ret;
4130 }
4131
4132 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4133 {
4134         struct nfs_server *server = NFS_SERVER(inode);
4135         int ret;
4136
4137         if (!nfs4_server_supports_acls(server))
4138                 return -EOPNOTSUPP;
4139         ret = nfs_revalidate_inode(server, inode);
4140         if (ret < 0)
4141                 return ret;
4142         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4143                 nfs_zap_acl_cache(inode);
4144         ret = nfs4_read_cached_acl(inode, buf, buflen);
4145         if (ret != -ENOENT)
4146                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4147                  * but no cached acl data, just the acl length */
4148                 return ret;
4149         return nfs4_get_acl_uncached(inode, buf, buflen);
4150 }
4151
4152 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4153 {
4154         struct nfs_server *server = NFS_SERVER(inode);
4155         struct page *pages[NFS4ACL_MAXPAGES];
4156         struct nfs_setaclargs arg = {
4157                 .fh             = NFS_FH(inode),
4158                 .acl_pages      = pages,
4159                 .acl_len        = buflen,
4160         };
4161         struct nfs_setaclres res;
4162         struct rpc_message msg = {
4163                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4164                 .rpc_argp       = &arg,
4165                 .rpc_resp       = &res,
4166         };
4167         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4168         int ret, i;
4169
4170         if (!nfs4_server_supports_acls(server))
4171                 return -EOPNOTSUPP;
4172         if (npages > ARRAY_SIZE(pages))
4173                 return -ERANGE;
4174         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4175         if (i < 0)
4176                 return i;
4177         nfs4_inode_return_delegation(inode);
4178         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4179
4180         /*
4181          * Free each page after tx, so the only ref left is
4182          * held by the network stack
4183          */
4184         for (; i > 0; i--)
4185                 put_page(pages[i-1]);
4186
4187         /*
4188          * Acl update can result in inode attribute update.
4189          * so mark the attribute cache invalid.
4190          */
4191         spin_lock(&inode->i_lock);
4192         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4193         spin_unlock(&inode->i_lock);
4194         nfs_access_zap_cache(inode);
4195         nfs_zap_acl_cache(inode);
4196         return ret;
4197 }
4198
4199 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4200 {
4201         struct nfs4_exception exception = { };
4202         int err;
4203         do {
4204                 err = nfs4_handle_exception(NFS_SERVER(inode),
4205                                 __nfs4_proc_set_acl(inode, buf, buflen),
4206                                 &exception);
4207         } while (exception.retry);
4208         return err;
4209 }
4210
4211 static int
4212 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4213 {
4214         struct nfs_client *clp = server->nfs_client;
4215
4216         if (task->tk_status >= 0)
4217                 return 0;
4218         switch(task->tk_status) {
4219                 case -NFS4ERR_DELEG_REVOKED:
4220                 case -NFS4ERR_ADMIN_REVOKED:
4221                 case -NFS4ERR_BAD_STATEID:
4222                         if (state == NULL)
4223                                 break;
4224                         nfs_remove_bad_delegation(state->inode);
4225                 case -NFS4ERR_OPENMODE:
4226                         if (state == NULL)
4227                                 break;
4228                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4229                                 goto stateid_invalid;
4230                         goto wait_on_recovery;
4231                 case -NFS4ERR_EXPIRED:
4232                         if (state != NULL) {
4233                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4234                                         goto stateid_invalid;
4235                         }
4236                 case -NFS4ERR_STALE_STATEID:
4237                 case -NFS4ERR_STALE_CLIENTID:
4238                         nfs4_schedule_lease_recovery(clp);
4239                         goto wait_on_recovery;
4240 #if defined(CONFIG_NFS_V4_1)
4241                 case -NFS4ERR_BADSESSION:
4242                 case -NFS4ERR_BADSLOT:
4243                 case -NFS4ERR_BAD_HIGH_SLOT:
4244                 case -NFS4ERR_DEADSESSION:
4245                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4246                 case -NFS4ERR_SEQ_FALSE_RETRY:
4247                 case -NFS4ERR_SEQ_MISORDERED:
4248                         dprintk("%s ERROR %d, Reset session\n", __func__,
4249                                 task->tk_status);
4250                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4251                         task->tk_status = 0;
4252                         return -EAGAIN;
4253 #endif /* CONFIG_NFS_V4_1 */
4254                 case -NFS4ERR_DELAY:
4255                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4256                 case -NFS4ERR_GRACE:
4257                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4258                         task->tk_status = 0;
4259                         return -EAGAIN;
4260                 case -NFS4ERR_RETRY_UNCACHED_REP:
4261                 case -NFS4ERR_OLD_STATEID:
4262                         task->tk_status = 0;
4263                         return -EAGAIN;
4264         }
4265         task->tk_status = nfs4_map_errors(task->tk_status);
4266         return 0;
4267 stateid_invalid:
4268         task->tk_status = -EIO;
4269         return 0;
4270 wait_on_recovery:
4271         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4272         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4273                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4274         task->tk_status = 0;
4275         return -EAGAIN;
4276 }
4277
4278 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4279                                     nfs4_verifier *bootverf)
4280 {
4281         __be32 verf[2];
4282
4283         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4284                 /* An impossible timestamp guarantees this value
4285                  * will never match a generated boot time. */
4286                 verf[0] = 0;
4287                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4288         } else {
4289                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4290                 verf[0] = (__be32)nn->boot_time.tv_sec;
4291                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4292         }
4293         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4294 }
4295
4296 static unsigned int
4297 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4298                                    char *buf, size_t len)
4299 {
4300         unsigned int result;
4301
4302         rcu_read_lock();
4303         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4304                                 clp->cl_ipaddr,
4305                                 rpc_peeraddr2str(clp->cl_rpcclient,
4306                                                         RPC_DISPLAY_ADDR),
4307                                 rpc_peeraddr2str(clp->cl_rpcclient,
4308                                                         RPC_DISPLAY_PROTO));
4309         rcu_read_unlock();
4310         return result;
4311 }
4312
4313 static unsigned int
4314 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4315                                 char *buf, size_t len)
4316 {
4317         char *nodename = clp->cl_rpcclient->cl_nodename;
4318
4319         if (nfs4_client_id_uniquifier[0] != '\0')
4320                 nodename = nfs4_client_id_uniquifier;
4321         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4322                                 clp->rpc_ops->version, clp->cl_minorversion,
4323                                 nodename);
4324 }
4325
4326 /**
4327  * nfs4_proc_setclientid - Negotiate client ID
4328  * @clp: state data structure
4329  * @program: RPC program for NFSv4 callback service
4330  * @port: IP port number for NFS4 callback service
4331  * @cred: RPC credential to use for this call
4332  * @res: where to place the result
4333  *
4334  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4335  */
4336 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4337                 unsigned short port, struct rpc_cred *cred,
4338                 struct nfs4_setclientid_res *res)
4339 {
4340         nfs4_verifier sc_verifier;
4341         struct nfs4_setclientid setclientid = {
4342                 .sc_verifier = &sc_verifier,
4343                 .sc_prog = program,
4344                 .sc_cb_ident = clp->cl_cb_ident,
4345         };
4346         struct rpc_message msg = {
4347                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4348                 .rpc_argp = &setclientid,
4349                 .rpc_resp = res,
4350                 .rpc_cred = cred,
4351         };
4352         int status;
4353
4354         /* nfs_client_id4 */
4355         nfs4_init_boot_verifier(clp, &sc_verifier);
4356         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4357                 setclientid.sc_name_len =
4358                                 nfs4_init_uniform_client_string(clp,
4359                                                 setclientid.sc_name,
4360                                                 sizeof(setclientid.sc_name));
4361         else
4362                 setclientid.sc_name_len =
4363                                 nfs4_init_nonuniform_client_string(clp,
4364                                                 setclientid.sc_name,
4365                                                 sizeof(setclientid.sc_name));
4366         /* cb_client4 */
4367         rcu_read_lock();
4368         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4369                                 sizeof(setclientid.sc_netid),
4370                                 rpc_peeraddr2str(clp->cl_rpcclient,
4371                                                         RPC_DISPLAY_NETID));
4372         rcu_read_unlock();
4373         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4374                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4375                                 clp->cl_ipaddr, port >> 8, port & 255);
4376
4377         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4378                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4379                 setclientid.sc_name_len, setclientid.sc_name);
4380         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4381         dprintk("NFS reply setclientid: %d\n", status);
4382         return status;
4383 }
4384
4385 /**
4386  * nfs4_proc_setclientid_confirm - Confirm client ID
4387  * @clp: state data structure
4388  * @res: result of a previous SETCLIENTID
4389  * @cred: RPC credential to use for this call
4390  *
4391  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4392  */
4393 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4394                 struct nfs4_setclientid_res *arg,
4395                 struct rpc_cred *cred)
4396 {
4397         struct rpc_message msg = {
4398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4399                 .rpc_argp = arg,
4400                 .rpc_cred = cred,
4401         };
4402         int status;
4403
4404         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4405                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4406                 clp->cl_clientid);
4407         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4408         dprintk("NFS reply setclientid_confirm: %d\n", status);
4409         return status;
4410 }
4411
4412 struct nfs4_delegreturndata {
4413         struct nfs4_delegreturnargs args;
4414         struct nfs4_delegreturnres res;
4415         struct nfs_fh fh;
4416         nfs4_stateid stateid;
4417         unsigned long timestamp;
4418         struct nfs_fattr fattr;
4419         int rpc_status;
4420 };
4421
4422 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4423 {
4424         struct nfs4_delegreturndata *data = calldata;
4425
4426         if (!nfs4_sequence_done(task, &data->res.seq_res))
4427                 return;
4428
4429         switch (task->tk_status) {
4430         case -NFS4ERR_STALE_STATEID:
4431         case -NFS4ERR_EXPIRED:
4432         case 0:
4433                 renew_lease(data->res.server, data->timestamp);
4434                 break;
4435         default:
4436                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4437                                 -EAGAIN) {
4438                         rpc_restart_call_prepare(task);
4439                         return;
4440                 }
4441         }
4442         data->rpc_status = task->tk_status;
4443 }
4444
4445 static void nfs4_delegreturn_release(void *calldata)
4446 {
4447         kfree(calldata);
4448 }
4449
4450 #if defined(CONFIG_NFS_V4_1)
4451 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4452 {
4453         struct nfs4_delegreturndata *d_data;
4454
4455         d_data = (struct nfs4_delegreturndata *)data;
4456
4457         nfs4_setup_sequence(d_data->res.server,
4458                         &d_data->args.seq_args,
4459                         &d_data->res.seq_res,
4460                         task);
4461 }
4462 #endif /* CONFIG_NFS_V4_1 */
4463
4464 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4465 #if defined(CONFIG_NFS_V4_1)
4466         .rpc_call_prepare = nfs4_delegreturn_prepare,
4467 #endif /* CONFIG_NFS_V4_1 */
4468         .rpc_call_done = nfs4_delegreturn_done,
4469         .rpc_release = nfs4_delegreturn_release,
4470 };
4471
4472 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4473 {
4474         struct nfs4_delegreturndata *data;
4475         struct nfs_server *server = NFS_SERVER(inode);
4476         struct rpc_task *task;
4477         struct rpc_message msg = {
4478                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4479                 .rpc_cred = cred,
4480         };
4481         struct rpc_task_setup task_setup_data = {
4482                 .rpc_client = server->client,
4483                 .rpc_message = &msg,
4484                 .callback_ops = &nfs4_delegreturn_ops,
4485                 .flags = RPC_TASK_ASYNC,
4486         };
4487         int status = 0;
4488
4489         data = kzalloc(sizeof(*data), GFP_NOFS);
4490         if (data == NULL)
4491                 return -ENOMEM;
4492         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4493         data->args.fhandle = &data->fh;
4494         data->args.stateid = &data->stateid;
4495         data->args.bitmask = server->cache_consistency_bitmask;
4496         nfs_copy_fh(&data->fh, NFS_FH(inode));
4497         nfs4_stateid_copy(&data->stateid, stateid);
4498         data->res.fattr = &data->fattr;
4499         data->res.server = server;
4500         nfs_fattr_init(data->res.fattr);
4501         data->timestamp = jiffies;
4502         data->rpc_status = 0;
4503
4504         task_setup_data.callback_data = data;
4505         msg.rpc_argp = &data->args;
4506         msg.rpc_resp = &data->res;
4507         task = rpc_run_task(&task_setup_data);
4508         if (IS_ERR(task))
4509                 return PTR_ERR(task);
4510         if (!issync)
4511                 goto out;
4512         status = nfs4_wait_for_completion_rpc_task(task);
4513         if (status != 0)
4514                 goto out;
4515         status = data->rpc_status;
4516         if (status == 0)
4517                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4518         else
4519                 nfs_refresh_inode(inode, &data->fattr);
4520 out:
4521         rpc_put_task(task);
4522         return status;
4523 }
4524
4525 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4526 {
4527         struct nfs_server *server = NFS_SERVER(inode);
4528         struct nfs4_exception exception = { };
4529         int err;
4530         do {
4531                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4532                 switch (err) {
4533                         case -NFS4ERR_STALE_STATEID:
4534                         case -NFS4ERR_EXPIRED:
4535                         case 0:
4536                                 return 0;
4537                 }
4538                 err = nfs4_handle_exception(server, err, &exception);
4539         } while (exception.retry);
4540         return err;
4541 }
4542
4543 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4544 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4545
4546 /*
4547  * sleep, with exponential backoff, and retry the LOCK operation.
4548  */
4549 static unsigned long
4550 nfs4_set_lock_task_retry(unsigned long timeout)
4551 {
4552         freezable_schedule_timeout_killable(timeout);
4553         timeout <<= 1;
4554         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4555                 return NFS4_LOCK_MAXTIMEOUT;
4556         return timeout;
4557 }
4558
4559 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4560 {
4561         struct inode *inode = state->inode;
4562         struct nfs_server *server = NFS_SERVER(inode);
4563         struct nfs_client *clp = server->nfs_client;
4564         struct nfs_lockt_args arg = {
4565                 .fh = NFS_FH(inode),
4566                 .fl = request,
4567         };
4568         struct nfs_lockt_res res = {
4569                 .denied = request,
4570         };
4571         struct rpc_message msg = {
4572                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4573                 .rpc_argp       = &arg,
4574                 .rpc_resp       = &res,
4575                 .rpc_cred       = state->owner->so_cred,
4576         };
4577         struct nfs4_lock_state *lsp;
4578         int status;
4579
4580         arg.lock_owner.clientid = clp->cl_clientid;
4581         status = nfs4_set_lock_state(state, request);
4582         if (status != 0)
4583                 goto out;
4584         lsp = request->fl_u.nfs4_fl.owner;
4585         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4586         arg.lock_owner.s_dev = server->s_dev;
4587         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4588         switch (status) {
4589                 case 0:
4590                         request->fl_type = F_UNLCK;
4591                         break;
4592                 case -NFS4ERR_DENIED:
4593                         status = 0;
4594         }
4595         request->fl_ops->fl_release_private(request);
4596 out:
4597         return status;
4598 }
4599
4600 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4601 {
4602         struct nfs4_exception exception = { };
4603         int err;
4604
4605         do {
4606                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4607                                 _nfs4_proc_getlk(state, cmd, request),
4608                                 &exception);
4609         } while (exception.retry);
4610         return err;
4611 }
4612
4613 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4614 {
4615         int res = 0;
4616         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4617                 case FL_POSIX:
4618                         res = posix_lock_file_wait(file, fl);
4619                         break;
4620                 case FL_FLOCK:
4621                         res = flock_lock_file_wait(file, fl);
4622                         break;
4623                 default:
4624                         BUG();
4625         }
4626         return res;
4627 }
4628
4629 struct nfs4_unlockdata {
4630         struct nfs_locku_args arg;
4631         struct nfs_locku_res res;
4632         struct nfs4_lock_state *lsp;
4633         struct nfs_open_context *ctx;
4634         struct file_lock fl;
4635         const struct nfs_server *server;
4636         unsigned long timestamp;
4637 };
4638
4639 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4640                 struct nfs_open_context *ctx,
4641                 struct nfs4_lock_state *lsp,
4642                 struct nfs_seqid *seqid)
4643 {
4644         struct nfs4_unlockdata *p;
4645         struct inode *inode = lsp->ls_state->inode;
4646
4647         p = kzalloc(sizeof(*p), GFP_NOFS);
4648         if (p == NULL)
4649                 return NULL;
4650         p->arg.fh = NFS_FH(inode);
4651         p->arg.fl = &p->fl;
4652         p->arg.seqid = seqid;
4653         p->res.seqid = seqid;
4654         p->arg.stateid = &lsp->ls_stateid;
4655         p->lsp = lsp;
4656         atomic_inc(&lsp->ls_count);
4657         /* Ensure we don't close file until we're done freeing locks! */
4658         p->ctx = get_nfs_open_context(ctx);
4659         memcpy(&p->fl, fl, sizeof(p->fl));
4660         p->server = NFS_SERVER(inode);
4661         return p;
4662 }
4663
4664 static void nfs4_locku_release_calldata(void *data)
4665 {
4666         struct nfs4_unlockdata *calldata = data;
4667         nfs_free_seqid(calldata->arg.seqid);
4668         nfs4_put_lock_state(calldata->lsp);
4669         put_nfs_open_context(calldata->ctx);
4670         kfree(calldata);
4671 }
4672
4673 static void nfs4_locku_done(struct rpc_task *task, void *data)
4674 {
4675         struct nfs4_unlockdata *calldata = data;
4676
4677         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4678                 return;
4679         switch (task->tk_status) {
4680                 case 0:
4681                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4682                                         &calldata->res.stateid);
4683                         renew_lease(calldata->server, calldata->timestamp);
4684                         break;
4685                 case -NFS4ERR_BAD_STATEID:
4686                 case -NFS4ERR_OLD_STATEID:
4687                 case -NFS4ERR_STALE_STATEID:
4688                 case -NFS4ERR_EXPIRED:
4689                         break;
4690                 default:
4691                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4692                                 rpc_restart_call_prepare(task);
4693         }
4694         nfs_release_seqid(calldata->arg.seqid);
4695 }
4696
4697 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4698 {
4699         struct nfs4_unlockdata *calldata = data;
4700
4701         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4702                 goto out_wait;
4703         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4704                 /* Note: exit _without_ running nfs4_locku_done */
4705                 goto out_no_action;
4706         }
4707         calldata->timestamp = jiffies;
4708         if (nfs4_setup_sequence(calldata->server,
4709                                 &calldata->arg.seq_args,
4710                                 &calldata->res.seq_res,
4711                                 task) != 0)
4712                 nfs_release_seqid(calldata->arg.seqid);
4713         return;
4714 out_no_action:
4715         task->tk_action = NULL;
4716 out_wait:
4717         nfs4_sequence_done(task, &calldata->res.seq_res);
4718 }
4719
4720 static const struct rpc_call_ops nfs4_locku_ops = {
4721         .rpc_call_prepare = nfs4_locku_prepare,
4722         .rpc_call_done = nfs4_locku_done,
4723         .rpc_release = nfs4_locku_release_calldata,
4724 };
4725
4726 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4727                 struct nfs_open_context *ctx,
4728                 struct nfs4_lock_state *lsp,
4729                 struct nfs_seqid *seqid)
4730 {
4731         struct nfs4_unlockdata *data;
4732         struct rpc_message msg = {
4733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4734                 .rpc_cred = ctx->cred,
4735         };
4736         struct rpc_task_setup task_setup_data = {
4737                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4738                 .rpc_message = &msg,
4739                 .callback_ops = &nfs4_locku_ops,
4740                 .workqueue = nfsiod_workqueue,
4741                 .flags = RPC_TASK_ASYNC,
4742         };
4743
4744         /* Ensure this is an unlock - when canceling a lock, the
4745          * canceled lock is passed in, and it won't be an unlock.
4746          */
4747         fl->fl_type = F_UNLCK;
4748
4749         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4750         if (data == NULL) {
4751                 nfs_free_seqid(seqid);
4752                 return ERR_PTR(-ENOMEM);
4753         }
4754
4755         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4756         msg.rpc_argp = &data->arg;
4757         msg.rpc_resp = &data->res;
4758         task_setup_data.callback_data = data;
4759         return rpc_run_task(&task_setup_data);
4760 }
4761
4762 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4763 {
4764         struct inode *inode = state->inode;
4765         struct nfs4_state_owner *sp = state->owner;
4766         struct nfs_inode *nfsi = NFS_I(inode);
4767         struct nfs_seqid *seqid;
4768         struct nfs4_lock_state *lsp;
4769         struct rpc_task *task;
4770         int status = 0;
4771         unsigned char fl_flags = request->fl_flags;
4772
4773         status = nfs4_set_lock_state(state, request);
4774         /* Unlock _before_ we do the RPC call */
4775         request->fl_flags |= FL_EXISTS;
4776         /* Exclude nfs_delegation_claim_locks() */
4777         mutex_lock(&sp->so_delegreturn_mutex);
4778         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4779         down_read(&nfsi->rwsem);
4780         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4781                 up_read(&nfsi->rwsem);
4782                 mutex_unlock(&sp->so_delegreturn_mutex);
4783                 goto out;
4784         }
4785         up_read(&nfsi->rwsem);
4786         mutex_unlock(&sp->so_delegreturn_mutex);
4787         if (status != 0)
4788                 goto out;
4789         /* Is this a delegated lock? */
4790         lsp = request->fl_u.nfs4_fl.owner;
4791         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
4792                 goto out;
4793         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4794         status = -ENOMEM;
4795         if (seqid == NULL)
4796                 goto out;
4797         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4798         status = PTR_ERR(task);
4799         if (IS_ERR(task))
4800                 goto out;
4801         status = nfs4_wait_for_completion_rpc_task(task);
4802         rpc_put_task(task);
4803 out:
4804         request->fl_flags = fl_flags;
4805         return status;
4806 }
4807
4808 struct nfs4_lockdata {
4809         struct nfs_lock_args arg;
4810         struct nfs_lock_res res;
4811         struct nfs4_lock_state *lsp;
4812         struct nfs_open_context *ctx;
4813         struct file_lock fl;
4814         unsigned long timestamp;
4815         int rpc_status;
4816         int cancelled;
4817         struct nfs_server *server;
4818 };
4819
4820 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4821                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4822                 gfp_t gfp_mask)
4823 {
4824         struct nfs4_lockdata *p;
4825         struct inode *inode = lsp->ls_state->inode;
4826         struct nfs_server *server = NFS_SERVER(inode);
4827
4828         p = kzalloc(sizeof(*p), gfp_mask);
4829         if (p == NULL)
4830                 return NULL;
4831
4832         p->arg.fh = NFS_FH(inode);
4833         p->arg.fl = &p->fl;
4834         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4835         if (p->arg.open_seqid == NULL)
4836                 goto out_free;
4837         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4838         if (p->arg.lock_seqid == NULL)
4839                 goto out_free_seqid;
4840         p->arg.lock_stateid = &lsp->ls_stateid;
4841         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4842         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4843         p->arg.lock_owner.s_dev = server->s_dev;
4844         p->res.lock_seqid = p->arg.lock_seqid;
4845         p->lsp = lsp;
4846         p->server = server;
4847         atomic_inc(&lsp->ls_count);
4848         p->ctx = get_nfs_open_context(ctx);
4849         memcpy(&p->fl, fl, sizeof(p->fl));
4850         return p;
4851 out_free_seqid:
4852         nfs_free_seqid(p->arg.open_seqid);
4853 out_free:
4854         kfree(p);
4855         return NULL;
4856 }
4857
4858 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4859 {
4860         struct nfs4_lockdata *data = calldata;
4861         struct nfs4_state *state = data->lsp->ls_state;
4862
4863         dprintk("%s: begin!\n", __func__);
4864         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4865                 goto out_wait;
4866         /* Do we need to do an open_to_lock_owner? */
4867         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4868                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4869                         goto out_release_lock_seqid;
4870                 }
4871                 data->arg.open_stateid = &state->open_stateid;
4872                 data->arg.new_lock_owner = 1;
4873                 data->res.open_seqid = data->arg.open_seqid;
4874         } else
4875                 data->arg.new_lock_owner = 0;
4876         if (!nfs4_valid_open_stateid(state)) {
4877                 data->rpc_status = -EBADF;
4878                 task->tk_action = NULL;
4879                 goto out_release_open_seqid;
4880         }
4881         data->timestamp = jiffies;
4882         if (nfs4_setup_sequence(data->server,
4883                                 &data->arg.seq_args,
4884                                 &data->res.seq_res,
4885                                 task) == 0)
4886                 return;
4887 out_release_open_seqid:
4888         nfs_release_seqid(data->arg.open_seqid);
4889 out_release_lock_seqid:
4890         nfs_release_seqid(data->arg.lock_seqid);
4891 out_wait:
4892         nfs4_sequence_done(task, &data->res.seq_res);
4893         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4894 }
4895
4896 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4897 {
4898         struct nfs4_lockdata *data = calldata;
4899
4900         dprintk("%s: begin!\n", __func__);
4901
4902         if (!nfs4_sequence_done(task, &data->res.seq_res))
4903                 return;
4904
4905         data->rpc_status = task->tk_status;
4906         if (data->arg.new_lock_owner != 0) {
4907                 if (data->rpc_status == 0)
4908                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4909                 else
4910                         goto out;
4911         }
4912         if (data->rpc_status == 0) {
4913                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4914                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4915                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4916         }
4917 out:
4918         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4919 }
4920
4921 static void nfs4_lock_release(void *calldata)
4922 {
4923         struct nfs4_lockdata *data = calldata;
4924
4925         dprintk("%s: begin!\n", __func__);
4926         nfs_free_seqid(data->arg.open_seqid);
4927         if (data->cancelled != 0) {
4928                 struct rpc_task *task;
4929                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4930                                 data->arg.lock_seqid);
4931                 if (!IS_ERR(task))
4932                         rpc_put_task_async(task);
4933                 dprintk("%s: cancelling lock!\n", __func__);
4934         } else
4935                 nfs_free_seqid(data->arg.lock_seqid);
4936         nfs4_put_lock_state(data->lsp);
4937         put_nfs_open_context(data->ctx);
4938         kfree(data);
4939         dprintk("%s: done!\n", __func__);
4940 }
4941
4942 static const struct rpc_call_ops nfs4_lock_ops = {
4943         .rpc_call_prepare = nfs4_lock_prepare,
4944         .rpc_call_done = nfs4_lock_done,
4945         .rpc_release = nfs4_lock_release,
4946 };
4947
4948 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4949 {
4950         switch (error) {
4951         case -NFS4ERR_ADMIN_REVOKED:
4952         case -NFS4ERR_BAD_STATEID:
4953                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4954                 if (new_lock_owner != 0 ||
4955                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4956                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4957                 break;
4958         case -NFS4ERR_STALE_STATEID:
4959                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4960         case -NFS4ERR_EXPIRED:
4961                 nfs4_schedule_lease_recovery(server->nfs_client);
4962         };
4963 }
4964
4965 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4966 {
4967         struct nfs4_lockdata *data;
4968         struct rpc_task *task;
4969         struct rpc_message msg = {
4970                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4971                 .rpc_cred = state->owner->so_cred,
4972         };
4973         struct rpc_task_setup task_setup_data = {
4974                 .rpc_client = NFS_CLIENT(state->inode),
4975                 .rpc_message = &msg,
4976                 .callback_ops = &nfs4_lock_ops,
4977                 .workqueue = nfsiod_workqueue,
4978                 .flags = RPC_TASK_ASYNC,
4979         };
4980         int ret;
4981
4982         dprintk("%s: begin!\n", __func__);
4983         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4984                         fl->fl_u.nfs4_fl.owner,
4985                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4986         if (data == NULL)
4987                 return -ENOMEM;
4988         if (IS_SETLKW(cmd))
4989                 data->arg.block = 1;
4990         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4991         msg.rpc_argp = &data->arg;
4992         msg.rpc_resp = &data->res;
4993         task_setup_data.callback_data = data;
4994         if (recovery_type > NFS_LOCK_NEW) {
4995                 if (recovery_type == NFS_LOCK_RECLAIM)
4996                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4997                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4998         }
4999         task = rpc_run_task(&task_setup_data);
5000         if (IS_ERR(task))
5001                 return PTR_ERR(task);
5002         ret = nfs4_wait_for_completion_rpc_task(task);
5003         if (ret == 0) {
5004                 ret = data->rpc_status;
5005                 if (ret)
5006                         nfs4_handle_setlk_error(data->server, data->lsp,
5007                                         data->arg.new_lock_owner, ret);
5008         } else
5009                 data->cancelled = 1;
5010         rpc_put_task(task);
5011         dprintk("%s: done, ret = %d!\n", __func__, ret);
5012         return ret;
5013 }
5014
5015 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5016 {
5017         struct nfs_server *server = NFS_SERVER(state->inode);
5018         struct nfs4_exception exception = {
5019                 .inode = state->inode,
5020         };
5021         int err;
5022
5023         do {
5024                 /* Cache the lock if possible... */
5025                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5026                         return 0;
5027                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5028                 if (err != -NFS4ERR_DELAY)
5029                         break;
5030                 nfs4_handle_exception(server, err, &exception);
5031         } while (exception.retry);
5032         return err;
5033 }
5034
5035 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5036 {
5037         struct nfs_server *server = NFS_SERVER(state->inode);
5038         struct nfs4_exception exception = {
5039                 .inode = state->inode,
5040         };
5041         int err;
5042
5043         err = nfs4_set_lock_state(state, request);
5044         if (err != 0)
5045                 return err;
5046         do {
5047                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5048                         return 0;
5049                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5050                 switch (err) {
5051                 default:
5052                         goto out;
5053                 case -NFS4ERR_GRACE:
5054                 case -NFS4ERR_DELAY:
5055                         nfs4_handle_exception(server, err, &exception);
5056                         err = 0;
5057                 }
5058         } while (exception.retry);
5059 out:
5060         return err;
5061 }
5062
5063 #if defined(CONFIG_NFS_V4_1)
5064 /**
5065  * nfs41_check_expired_locks - possibly free a lock stateid
5066  *
5067  * @state: NFSv4 state for an inode
5068  *
5069  * Returns NFS_OK if recovery for this stateid is now finished.
5070  * Otherwise a negative NFS4ERR value is returned.
5071  */
5072 static int nfs41_check_expired_locks(struct nfs4_state *state)
5073 {
5074         int status, ret = -NFS4ERR_BAD_STATEID;
5075         struct nfs4_lock_state *lsp;
5076         struct nfs_server *server = NFS_SERVER(state->inode);
5077
5078         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5079                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5080                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5081
5082                         status = nfs41_test_stateid(server,
5083                                         &lsp->ls_stateid,
5084                                         cred);
5085                         if (status != NFS_OK) {
5086                                 /* Free the stateid unless the server
5087                                  * informs us the stateid is unrecognized. */
5088                                 if (status != -NFS4ERR_BAD_STATEID)
5089                                         nfs41_free_stateid(server,
5090                                                         &lsp->ls_stateid,
5091                                                         cred);
5092                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5093                                 ret = status;
5094                         }
5095                 }
5096         };
5097
5098         return ret;
5099 }
5100
5101 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5102 {
5103         int status = NFS_OK;
5104
5105         if (test_bit(LK_STATE_IN_USE, &state->flags))
5106                 status = nfs41_check_expired_locks(state);
5107         if (status != NFS_OK)
5108                 status = nfs4_lock_expired(state, request);
5109         return status;
5110 }
5111 #endif
5112
5113 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5114 {
5115         struct nfs4_state_owner *sp = state->owner;
5116         struct nfs_inode *nfsi = NFS_I(state->inode);
5117         unsigned char fl_flags = request->fl_flags;
5118         unsigned int seq;
5119         int status = -ENOLCK;
5120
5121         if ((fl_flags & FL_POSIX) &&
5122                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5123                 goto out;
5124         /* Is this a delegated open? */
5125         status = nfs4_set_lock_state(state, request);
5126         if (status != 0)
5127                 goto out;
5128         request->fl_flags |= FL_ACCESS;
5129         status = do_vfs_lock(request->fl_file, request);
5130         if (status < 0)
5131                 goto out;
5132         down_read(&nfsi->rwsem);
5133         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5134                 /* Yes: cache locks! */
5135                 /* ...but avoid races with delegation recall... */
5136                 request->fl_flags = fl_flags & ~FL_SLEEP;
5137                 status = do_vfs_lock(request->fl_file, request);
5138                 goto out_unlock;
5139         }
5140         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5141         up_read(&nfsi->rwsem);
5142         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5143         if (status != 0)
5144                 goto out;
5145         down_read(&nfsi->rwsem);
5146         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5147                 status = -NFS4ERR_DELAY;
5148                 goto out_unlock;
5149         }
5150         /* Note: we always want to sleep here! */
5151         request->fl_flags = fl_flags | FL_SLEEP;
5152         if (do_vfs_lock(request->fl_file, request) < 0)
5153                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5154                         "manager!\n", __func__);
5155 out_unlock:
5156         up_read(&nfsi->rwsem);
5157 out:
5158         request->fl_flags = fl_flags;
5159         return status;
5160 }
5161
5162 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5163 {
5164         struct nfs4_exception exception = {
5165                 .state = state,
5166                 .inode = state->inode,
5167         };
5168         int err;
5169
5170         do {
5171                 err = _nfs4_proc_setlk(state, cmd, request);
5172                 if (err == -NFS4ERR_DENIED)
5173                         err = -EAGAIN;
5174                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5175                                 err, &exception);
5176         } while (exception.retry);
5177         return err;
5178 }
5179
5180 static int
5181 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5182 {
5183         struct nfs_open_context *ctx;
5184         struct nfs4_state *state;
5185         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5186         int status;
5187
5188         /* verify open state */
5189         ctx = nfs_file_open_context(filp);
5190         state = ctx->state;
5191
5192         if (request->fl_start < 0 || request->fl_end < 0)
5193                 return -EINVAL;
5194
5195         if (IS_GETLK(cmd)) {
5196                 if (state != NULL)
5197                         return nfs4_proc_getlk(state, F_GETLK, request);
5198                 return 0;
5199         }
5200
5201         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5202                 return -EINVAL;
5203
5204         if (request->fl_type == F_UNLCK) {
5205                 if (state != NULL)
5206                         return nfs4_proc_unlck(state, cmd, request);
5207                 return 0;
5208         }
5209
5210         if (state == NULL)
5211                 return -ENOLCK;
5212         /*
5213          * Don't rely on the VFS having checked the file open mode,
5214          * since it won't do this for flock() locks.
5215          */
5216         switch (request->fl_type) {
5217         case F_RDLCK:
5218                 if (!(filp->f_mode & FMODE_READ))
5219                         return -EBADF;
5220                 break;
5221         case F_WRLCK:
5222                 if (!(filp->f_mode & FMODE_WRITE))
5223                         return -EBADF;
5224         }
5225
5226         do {
5227                 status = nfs4_proc_setlk(state, cmd, request);
5228                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5229                         break;
5230                 timeout = nfs4_set_lock_task_retry(timeout);
5231                 status = -ERESTARTSYS;
5232                 if (signalled())
5233                         break;
5234         } while(status < 0);
5235         return status;
5236 }
5237
5238 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5239 {
5240         struct nfs_server *server = NFS_SERVER(state->inode);
5241         int err;
5242
5243         err = nfs4_set_lock_state(state, fl);
5244         if (err != 0)
5245                 return err;
5246         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5247         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5248 }
5249
5250 struct nfs_release_lockowner_data {
5251         struct nfs4_lock_state *lsp;
5252         struct nfs_server *server;
5253         struct nfs_release_lockowner_args args;
5254 };
5255
5256 static void nfs4_release_lockowner_release(void *calldata)
5257 {
5258         struct nfs_release_lockowner_data *data = calldata;
5259         nfs4_free_lock_state(data->server, data->lsp);
5260         kfree(calldata);
5261 }
5262
5263 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5264         .rpc_release = nfs4_release_lockowner_release,
5265 };
5266
5267 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5268 {
5269         struct nfs_release_lockowner_data *data;
5270         struct rpc_message msg = {
5271                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5272         };
5273
5274         if (server->nfs_client->cl_mvops->minor_version != 0)
5275                 return -EINVAL;
5276         data = kmalloc(sizeof(*data), GFP_NOFS);
5277         if (!data)
5278                 return -ENOMEM;
5279         data->lsp = lsp;
5280         data->server = server;
5281         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5282         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5283         data->args.lock_owner.s_dev = server->s_dev;
5284         msg.rpc_argp = &data->args;
5285         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5286         return 0;
5287 }
5288
5289 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5290
5291 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5292                                    const void *buf, size_t buflen,
5293                                    int flags, int type)
5294 {
5295         if (strcmp(key, "") != 0)
5296                 return -EINVAL;
5297
5298         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5299 }
5300
5301 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5302                                    void *buf, size_t buflen, int type)
5303 {
5304         if (strcmp(key, "") != 0)
5305                 return -EINVAL;
5306
5307         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5308 }
5309
5310 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5311                                        size_t list_len, const char *name,
5312                                        size_t name_len, int type)
5313 {
5314         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5315
5316         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5317                 return 0;
5318
5319         if (list && len <= list_len)
5320                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5321         return len;
5322 }
5323
5324 /*
5325  * nfs_fhget will use either the mounted_on_fileid or the fileid
5326  */
5327 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5328 {
5329         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5330                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5331               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5332               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5333                 return;
5334
5335         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5336                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5337         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5338         fattr->nlink = 2;
5339 }
5340
5341 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5342                                    const struct qstr *name,
5343                                    struct nfs4_fs_locations *fs_locations,
5344                                    struct page *page)
5345 {
5346         struct nfs_server *server = NFS_SERVER(dir);
5347         u32 bitmask[2] = {
5348                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5349         };
5350         struct nfs4_fs_locations_arg args = {
5351                 .dir_fh = NFS_FH(dir),
5352                 .name = name,
5353                 .page = page,
5354                 .bitmask = bitmask,
5355         };
5356         struct nfs4_fs_locations_res res = {
5357                 .fs_locations = fs_locations,
5358         };
5359         struct rpc_message msg = {
5360                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5361                 .rpc_argp = &args,
5362                 .rpc_resp = &res,
5363         };
5364         int status;
5365
5366         dprintk("%s: start\n", __func__);
5367
5368         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5369          * is not supported */
5370         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5371                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5372         else
5373                 bitmask[0] |= FATTR4_WORD0_FILEID;
5374
5375         nfs_fattr_init(&fs_locations->fattr);
5376         fs_locations->server = server;
5377         fs_locations->nlocations = 0;
5378         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5379         dprintk("%s: returned status = %d\n", __func__, status);
5380         return status;
5381 }
5382
5383 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5384                            const struct qstr *name,
5385                            struct nfs4_fs_locations *fs_locations,
5386                            struct page *page)
5387 {
5388         struct nfs4_exception exception = { };
5389         int err;
5390         do {
5391                 err = nfs4_handle_exception(NFS_SERVER(dir),
5392                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5393                                 &exception);
5394         } while (exception.retry);
5395         return err;
5396 }
5397
5398 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5399 {
5400         int status;
5401         struct nfs4_secinfo_arg args = {
5402                 .dir_fh = NFS_FH(dir),
5403                 .name   = name,
5404         };
5405         struct nfs4_secinfo_res res = {
5406                 .flavors     = flavors,
5407         };
5408         struct rpc_message msg = {
5409                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5410                 .rpc_argp = &args,
5411                 .rpc_resp = &res,
5412         };
5413
5414         dprintk("NFS call  secinfo %s\n", name->name);
5415         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5416         dprintk("NFS reply  secinfo: %d\n", status);
5417         return status;
5418 }
5419
5420 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5421                       struct nfs4_secinfo_flavors *flavors)
5422 {
5423         struct nfs4_exception exception = { };
5424         int err;
5425         do {
5426                 err = nfs4_handle_exception(NFS_SERVER(dir),
5427                                 _nfs4_proc_secinfo(dir, name, flavors),
5428                                 &exception);
5429         } while (exception.retry);
5430         return err;
5431 }
5432
5433 #ifdef CONFIG_NFS_V4_1
5434 /*
5435  * Check the exchange flags returned by the server for invalid flags, having
5436  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5437  * DS flags set.
5438  */
5439 static int nfs4_check_cl_exchange_flags(u32 flags)
5440 {
5441         if (flags & ~EXCHGID4_FLAG_MASK_R)
5442                 goto out_inval;
5443         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5444             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5445                 goto out_inval;
5446         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5447                 goto out_inval;
5448         return NFS_OK;
5449 out_inval:
5450         return -NFS4ERR_INVAL;
5451 }
5452
5453 static bool
5454 nfs41_same_server_scope(struct nfs41_server_scope *a,
5455                         struct nfs41_server_scope *b)
5456 {
5457         if (a->server_scope_sz == b->server_scope_sz &&
5458             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5459                 return true;
5460
5461         return false;
5462 }
5463
5464 /*
5465  * nfs4_proc_bind_conn_to_session()
5466  *
5467  * The 4.1 client currently uses the same TCP connection for the
5468  * fore and backchannel.
5469  */
5470 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5471 {
5472         int status;
5473         struct nfs41_bind_conn_to_session_res res;
5474         struct rpc_message msg = {
5475                 .rpc_proc =
5476                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5477                 .rpc_argp = clp,
5478                 .rpc_resp = &res,
5479                 .rpc_cred = cred,
5480         };
5481
5482         dprintk("--> %s\n", __func__);
5483
5484         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5485         if (unlikely(res.session == NULL)) {
5486                 status = -ENOMEM;
5487                 goto out;
5488         }
5489
5490         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5491         if (status == 0) {
5492                 if (memcmp(res.session->sess_id.data,
5493                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5494                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5495                         status = -EIO;
5496                         goto out_session;
5497                 }
5498                 if (res.dir != NFS4_CDFS4_BOTH) {
5499                         dprintk("NFS: %s: Unexpected direction from server\n",
5500                                 __func__);
5501                         status = -EIO;
5502                         goto out_session;
5503                 }
5504                 if (res.use_conn_in_rdma_mode) {
5505                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5506                                 __func__);
5507                         status = -EIO;
5508                         goto out_session;
5509                 }
5510         }
5511 out_session:
5512         kfree(res.session);
5513 out:
5514         dprintk("<-- %s status= %d\n", __func__, status);
5515         return status;
5516 }
5517
5518 /*
5519  * nfs4_proc_exchange_id()
5520  *
5521  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5522  *
5523  * Since the clientid has expired, all compounds using sessions
5524  * associated with the stale clientid will be returning
5525  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5526  * be in some phase of session reset.
5527  */
5528 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5529 {
5530         nfs4_verifier verifier;
5531         struct nfs41_exchange_id_args args = {
5532                 .verifier = &verifier,
5533                 .client = clp,
5534                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
5535                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
5536         };
5537         struct nfs41_exchange_id_res res = {
5538                 0
5539         };
5540         int status;
5541         struct rpc_message msg = {
5542                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5543                 .rpc_argp = &args,
5544                 .rpc_resp = &res,
5545                 .rpc_cred = cred,
5546         };
5547
5548         nfs4_init_boot_verifier(clp, &verifier);
5549         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5550                                                         sizeof(args.id));
5551         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5552                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5553                 args.id_len, args.id);
5554
5555         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5556                                         GFP_NOFS);
5557         if (unlikely(res.server_owner == NULL)) {
5558                 status = -ENOMEM;
5559                 goto out;
5560         }
5561
5562         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5563                                         GFP_NOFS);
5564         if (unlikely(res.server_scope == NULL)) {
5565                 status = -ENOMEM;
5566                 goto out_server_owner;
5567         }
5568
5569         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5570         if (unlikely(res.impl_id == NULL)) {
5571                 status = -ENOMEM;
5572                 goto out_server_scope;
5573         }
5574
5575         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5576         if (status == 0)
5577                 status = nfs4_check_cl_exchange_flags(res.flags);
5578
5579         if (status == 0) {
5580                 clp->cl_clientid = res.clientid;
5581                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5582                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5583                         clp->cl_seqid = res.seqid;
5584
5585                 kfree(clp->cl_serverowner);
5586                 clp->cl_serverowner = res.server_owner;
5587                 res.server_owner = NULL;
5588
5589                 /* use the most recent implementation id */
5590                 kfree(clp->cl_implid);
5591                 clp->cl_implid = res.impl_id;
5592
5593                 if (clp->cl_serverscope != NULL &&
5594                     !nfs41_same_server_scope(clp->cl_serverscope,
5595                                              res.server_scope)) {
5596                         dprintk("%s: server_scope mismatch detected\n",
5597                                 __func__);
5598                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5599                         kfree(clp->cl_serverscope);
5600                         clp->cl_serverscope = NULL;
5601                 }
5602
5603                 if (clp->cl_serverscope == NULL) {
5604                         clp->cl_serverscope = res.server_scope;
5605                         goto out;
5606                 }
5607         } else
5608                 kfree(res.impl_id);
5609
5610 out_server_owner:
5611         kfree(res.server_owner);
5612 out_server_scope:
5613         kfree(res.server_scope);
5614 out:
5615         if (clp->cl_implid != NULL)
5616                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5617                         "domain: %s, name: %s, date: %llu,%u\n",
5618                         clp->cl_implid->domain, clp->cl_implid->name,
5619                         clp->cl_implid->date.seconds,
5620                         clp->cl_implid->date.nseconds);
5621         dprintk("NFS reply exchange_id: %d\n", status);
5622         return status;
5623 }
5624
5625 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5626                 struct rpc_cred *cred)
5627 {
5628         struct rpc_message msg = {
5629                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5630                 .rpc_argp = clp,
5631                 .rpc_cred = cred,
5632         };
5633         int status;
5634
5635         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5636         if (status)
5637                 dprintk("NFS: Got error %d from the server %s on "
5638                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5639         return status;
5640 }
5641
5642 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5643                 struct rpc_cred *cred)
5644 {
5645         unsigned int loop;
5646         int ret;
5647
5648         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5649                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5650                 switch (ret) {
5651                 case -NFS4ERR_DELAY:
5652                 case -NFS4ERR_CLIENTID_BUSY:
5653                         ssleep(1);
5654                         break;
5655                 default:
5656                         return ret;
5657                 }
5658         }
5659         return 0;
5660 }
5661
5662 int nfs4_destroy_clientid(struct nfs_client *clp)
5663 {
5664         struct rpc_cred *cred;
5665         int ret = 0;
5666
5667         if (clp->cl_mvops->minor_version < 1)
5668                 goto out;
5669         if (clp->cl_exchange_flags == 0)
5670                 goto out;
5671         if (clp->cl_preserve_clid)
5672                 goto out;
5673         cred = nfs4_get_exchange_id_cred(clp);
5674         ret = nfs4_proc_destroy_clientid(clp, cred);
5675         if (cred)
5676                 put_rpccred(cred);
5677         switch (ret) {
5678         case 0:
5679         case -NFS4ERR_STALE_CLIENTID:
5680                 clp->cl_exchange_flags = 0;
5681         }
5682 out:
5683         return ret;
5684 }
5685
5686 struct nfs4_get_lease_time_data {
5687         struct nfs4_get_lease_time_args *args;
5688         struct nfs4_get_lease_time_res *res;
5689         struct nfs_client *clp;
5690 };
5691
5692 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5693                                         void *calldata)
5694 {
5695         struct nfs4_get_lease_time_data *data =
5696                         (struct nfs4_get_lease_time_data *)calldata;
5697
5698         dprintk("--> %s\n", __func__);
5699         /* just setup sequence, do not trigger session recovery
5700            since we're invoked within one */
5701         nfs41_setup_sequence(data->clp->cl_session,
5702                         &data->args->la_seq_args,
5703                         &data->res->lr_seq_res,
5704                         task);
5705         dprintk("<-- %s\n", __func__);
5706 }
5707
5708 /*
5709  * Called from nfs4_state_manager thread for session setup, so don't recover
5710  * from sequence operation or clientid errors.
5711  */
5712 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5713 {
5714         struct nfs4_get_lease_time_data *data =
5715                         (struct nfs4_get_lease_time_data *)calldata;
5716
5717         dprintk("--> %s\n", __func__);
5718         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5719                 return;
5720         switch (task->tk_status) {
5721         case -NFS4ERR_DELAY:
5722         case -NFS4ERR_GRACE:
5723                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5724                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5725                 task->tk_status = 0;
5726                 /* fall through */
5727         case -NFS4ERR_RETRY_UNCACHED_REP:
5728                 rpc_restart_call_prepare(task);
5729                 return;
5730         }
5731         dprintk("<-- %s\n", __func__);
5732 }
5733
5734 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5735         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5736         .rpc_call_done = nfs4_get_lease_time_done,
5737 };
5738
5739 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5740 {
5741         struct rpc_task *task;
5742         struct nfs4_get_lease_time_args args;
5743         struct nfs4_get_lease_time_res res = {
5744                 .lr_fsinfo = fsinfo,
5745         };
5746         struct nfs4_get_lease_time_data data = {
5747                 .args = &args,
5748                 .res = &res,
5749                 .clp = clp,
5750         };
5751         struct rpc_message msg = {
5752                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5753                 .rpc_argp = &args,
5754                 .rpc_resp = &res,
5755         };
5756         struct rpc_task_setup task_setup = {
5757                 .rpc_client = clp->cl_rpcclient,
5758                 .rpc_message = &msg,
5759                 .callback_ops = &nfs4_get_lease_time_ops,
5760                 .callback_data = &data,
5761                 .flags = RPC_TASK_TIMEOUT,
5762         };
5763         int status;
5764
5765         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5766         nfs4_set_sequence_privileged(&args.la_seq_args);
5767         dprintk("--> %s\n", __func__);
5768         task = rpc_run_task(&task_setup);
5769
5770         if (IS_ERR(task))
5771                 status = PTR_ERR(task);
5772         else {
5773                 status = task->tk_status;
5774                 rpc_put_task(task);
5775         }
5776         dprintk("<-- %s return %d\n", __func__, status);
5777
5778         return status;
5779 }
5780
5781 /*
5782  * Initialize the values to be used by the client in CREATE_SESSION
5783  * If nfs4_init_session set the fore channel request and response sizes,
5784  * use them.
5785  *
5786  * Set the back channel max_resp_sz_cached to zero to force the client to
5787  * always set csa_cachethis to FALSE because the current implementation
5788  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5789  */
5790 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5791 {
5792         struct nfs4_session *session = args->client->cl_session;
5793         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5794                      mxresp_sz = session->fc_target_max_resp_sz;
5795
5796         if (mxrqst_sz == 0)
5797                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5798         if (mxresp_sz == 0)
5799                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5800         /* Fore channel attributes */
5801         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5802         args->fc_attrs.max_resp_sz = mxresp_sz;
5803         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5804         args->fc_attrs.max_reqs = max_session_slots;
5805
5806         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5807                 "max_ops=%u max_reqs=%u\n",
5808                 __func__,
5809                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5810                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5811
5812         /* Back channel attributes */
5813         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5814         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5815         args->bc_attrs.max_resp_sz_cached = 0;
5816         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5817         args->bc_attrs.max_reqs = 1;
5818
5819         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5820                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5821                 __func__,
5822                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5823                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5824                 args->bc_attrs.max_reqs);
5825 }
5826
5827 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5828 {
5829         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5830         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5831
5832         if (rcvd->max_resp_sz > sent->max_resp_sz)
5833                 return -EINVAL;
5834         /*
5835          * Our requested max_ops is the minimum we need; we're not
5836          * prepared to break up compounds into smaller pieces than that.
5837          * So, no point even trying to continue if the server won't
5838          * cooperate:
5839          */
5840         if (rcvd->max_ops < sent->max_ops)
5841                 return -EINVAL;
5842         if (rcvd->max_reqs == 0)
5843                 return -EINVAL;
5844         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5845                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5846         return 0;
5847 }
5848
5849 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5850 {
5851         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5852         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5853
5854         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5855                 return -EINVAL;
5856         if (rcvd->max_resp_sz < sent->max_resp_sz)
5857                 return -EINVAL;
5858         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5859                 return -EINVAL;
5860         /* These would render the backchannel useless: */
5861         if (rcvd->max_ops != sent->max_ops)
5862                 return -EINVAL;
5863         if (rcvd->max_reqs != sent->max_reqs)
5864                 return -EINVAL;
5865         return 0;
5866 }
5867
5868 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5869                                      struct nfs4_session *session)
5870 {
5871         int ret;
5872
5873         ret = nfs4_verify_fore_channel_attrs(args, session);
5874         if (ret)
5875                 return ret;
5876         return nfs4_verify_back_channel_attrs(args, session);
5877 }
5878
5879 static int _nfs4_proc_create_session(struct nfs_client *clp,
5880                 struct rpc_cred *cred)
5881 {
5882         struct nfs4_session *session = clp->cl_session;
5883         struct nfs41_create_session_args args = {
5884                 .client = clp,
5885                 .cb_program = NFS4_CALLBACK,
5886         };
5887         struct nfs41_create_session_res res = {
5888                 .client = clp,
5889         };
5890         struct rpc_message msg = {
5891                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5892                 .rpc_argp = &args,
5893                 .rpc_resp = &res,
5894                 .rpc_cred = cred,
5895         };
5896         int status;
5897
5898         nfs4_init_channel_attrs(&args);
5899         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5900
5901         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5902
5903         if (!status) {
5904                 /* Verify the session's negotiated channel_attrs values */
5905                 status = nfs4_verify_channel_attrs(&args, session);
5906                 /* Increment the clientid slot sequence id */
5907                 clp->cl_seqid++;
5908         }
5909
5910         return status;
5911 }
5912
5913 /*
5914  * Issues a CREATE_SESSION operation to the server.
5915  * It is the responsibility of the caller to verify the session is
5916  * expired before calling this routine.
5917  */
5918 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5919 {
5920         int status;
5921         unsigned *ptr;
5922         struct nfs4_session *session = clp->cl_session;
5923
5924         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5925
5926         status = _nfs4_proc_create_session(clp, cred);
5927         if (status)
5928                 goto out;
5929
5930         /* Init or reset the session slot tables */
5931         status = nfs4_setup_session_slot_tables(session);
5932         dprintk("slot table setup returned %d\n", status);
5933         if (status)
5934                 goto out;
5935
5936         ptr = (unsigned *)&session->sess_id.data[0];
5937         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5938                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5939 out:
5940         dprintk("<-- %s\n", __func__);
5941         return status;
5942 }
5943
5944 /*
5945  * Issue the over-the-wire RPC DESTROY_SESSION.
5946  * The caller must serialize access to this routine.
5947  */
5948 int nfs4_proc_destroy_session(struct nfs4_session *session,
5949                 struct rpc_cred *cred)
5950 {
5951         struct rpc_message msg = {
5952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5953                 .rpc_argp = session,
5954                 .rpc_cred = cred,
5955         };
5956         int status = 0;
5957
5958         dprintk("--> nfs4_proc_destroy_session\n");
5959
5960         /* session is still being setup */
5961         if (session->clp->cl_cons_state != NFS_CS_READY)
5962                 return status;
5963
5964         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5965
5966         if (status)
5967                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5968                         "Session has been destroyed regardless...\n", status);
5969
5970         dprintk("<-- nfs4_proc_destroy_session\n");
5971         return status;
5972 }
5973
5974 /*
5975  * Renew the cl_session lease.
5976  */
5977 struct nfs4_sequence_data {
5978         struct nfs_client *clp;
5979         struct nfs4_sequence_args args;
5980         struct nfs4_sequence_res res;
5981 };
5982
5983 static void nfs41_sequence_release(void *data)
5984 {
5985         struct nfs4_sequence_data *calldata = data;
5986         struct nfs_client *clp = calldata->clp;
5987
5988         if (atomic_read(&clp->cl_count) > 1)
5989                 nfs4_schedule_state_renewal(clp);
5990         nfs_put_client(clp);
5991         kfree(calldata);
5992 }
5993
5994 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5995 {
5996         switch(task->tk_status) {
5997         case -NFS4ERR_DELAY:
5998                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5999                 return -EAGAIN;
6000         default:
6001                 nfs4_schedule_lease_recovery(clp);
6002         }
6003         return 0;
6004 }
6005
6006 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6007 {
6008         struct nfs4_sequence_data *calldata = data;
6009         struct nfs_client *clp = calldata->clp;
6010
6011         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6012                 return;
6013
6014         if (task->tk_status < 0) {
6015                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6016                 if (atomic_read(&clp->cl_count) == 1)
6017                         goto out;
6018
6019                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6020                         rpc_restart_call_prepare(task);
6021                         return;
6022                 }
6023         }
6024         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6025 out:
6026         dprintk("<-- %s\n", __func__);
6027 }
6028
6029 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6030 {
6031         struct nfs4_sequence_data *calldata = data;
6032         struct nfs_client *clp = calldata->clp;
6033         struct nfs4_sequence_args *args;
6034         struct nfs4_sequence_res *res;
6035
6036         args = task->tk_msg.rpc_argp;
6037         res = task->tk_msg.rpc_resp;
6038
6039         nfs41_setup_sequence(clp->cl_session, args, res, task);
6040 }
6041
6042 static const struct rpc_call_ops nfs41_sequence_ops = {
6043         .rpc_call_done = nfs41_sequence_call_done,
6044         .rpc_call_prepare = nfs41_sequence_prepare,
6045         .rpc_release = nfs41_sequence_release,
6046 };
6047
6048 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6049                 struct rpc_cred *cred,
6050                 bool is_privileged)
6051 {
6052         struct nfs4_sequence_data *calldata;
6053         struct rpc_message msg = {
6054                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6055                 .rpc_cred = cred,
6056         };
6057         struct rpc_task_setup task_setup_data = {
6058                 .rpc_client = clp->cl_rpcclient,
6059                 .rpc_message = &msg,
6060                 .callback_ops = &nfs41_sequence_ops,
6061                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6062         };
6063
6064         if (!atomic_inc_not_zero(&clp->cl_count))
6065                 return ERR_PTR(-EIO);
6066         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6067         if (calldata == NULL) {
6068                 nfs_put_client(clp);
6069                 return ERR_PTR(-ENOMEM);
6070         }
6071         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6072         if (is_privileged)
6073                 nfs4_set_sequence_privileged(&calldata->args);
6074         msg.rpc_argp = &calldata->args;
6075         msg.rpc_resp = &calldata->res;
6076         calldata->clp = clp;
6077         task_setup_data.callback_data = calldata;
6078
6079         return rpc_run_task(&task_setup_data);
6080 }
6081
6082 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6083 {
6084         struct rpc_task *task;
6085         int ret = 0;
6086
6087         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6088                 return 0;
6089         task = _nfs41_proc_sequence(clp, cred, false);
6090         if (IS_ERR(task))
6091                 ret = PTR_ERR(task);
6092         else
6093                 rpc_put_task_async(task);
6094         dprintk("<-- %s status=%d\n", __func__, ret);
6095         return ret;
6096 }
6097
6098 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6099 {
6100         struct rpc_task *task;
6101         int ret;
6102
6103         task = _nfs41_proc_sequence(clp, cred, true);
6104         if (IS_ERR(task)) {
6105                 ret = PTR_ERR(task);
6106                 goto out;
6107         }
6108         ret = rpc_wait_for_completion_task(task);
6109         if (!ret) {
6110                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6111
6112                 if (task->tk_status == 0)
6113                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6114                 ret = task->tk_status;
6115         }
6116         rpc_put_task(task);
6117 out:
6118         dprintk("<-- %s status=%d\n", __func__, ret);
6119         return ret;
6120 }
6121
6122 struct nfs4_reclaim_complete_data {
6123         struct nfs_client *clp;
6124         struct nfs41_reclaim_complete_args arg;
6125         struct nfs41_reclaim_complete_res res;
6126 };
6127
6128 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6129 {
6130         struct nfs4_reclaim_complete_data *calldata = data;
6131
6132         nfs41_setup_sequence(calldata->clp->cl_session,
6133                         &calldata->arg.seq_args,
6134                         &calldata->res.seq_res,
6135                         task);
6136 }
6137
6138 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6139 {
6140         switch(task->tk_status) {
6141         case 0:
6142         case -NFS4ERR_COMPLETE_ALREADY:
6143         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6144                 break;
6145         case -NFS4ERR_DELAY:
6146                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6147                 /* fall through */
6148         case -NFS4ERR_RETRY_UNCACHED_REP:
6149                 return -EAGAIN;
6150         default:
6151                 nfs4_schedule_lease_recovery(clp);
6152         }
6153         return 0;
6154 }
6155
6156 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6157 {
6158         struct nfs4_reclaim_complete_data *calldata = data;
6159         struct nfs_client *clp = calldata->clp;
6160         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6161
6162         dprintk("--> %s\n", __func__);
6163         if (!nfs41_sequence_done(task, res))
6164                 return;
6165
6166         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6167                 rpc_restart_call_prepare(task);
6168                 return;
6169         }
6170         dprintk("<-- %s\n", __func__);
6171 }
6172
6173 static void nfs4_free_reclaim_complete_data(void *data)
6174 {
6175         struct nfs4_reclaim_complete_data *calldata = data;
6176
6177         kfree(calldata);
6178 }
6179
6180 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6181         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6182         .rpc_call_done = nfs4_reclaim_complete_done,
6183         .rpc_release = nfs4_free_reclaim_complete_data,
6184 };
6185
6186 /*
6187  * Issue a global reclaim complete.
6188  */
6189 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6190                 struct rpc_cred *cred)
6191 {
6192         struct nfs4_reclaim_complete_data *calldata;
6193         struct rpc_task *task;
6194         struct rpc_message msg = {
6195                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6196                 .rpc_cred = cred,
6197         };
6198         struct rpc_task_setup task_setup_data = {
6199                 .rpc_client = clp->cl_rpcclient,
6200                 .rpc_message = &msg,
6201                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6202                 .flags = RPC_TASK_ASYNC,
6203         };
6204         int status = -ENOMEM;
6205
6206         dprintk("--> %s\n", __func__);
6207         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6208         if (calldata == NULL)
6209                 goto out;
6210         calldata->clp = clp;
6211         calldata->arg.one_fs = 0;
6212
6213         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6214         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6215         msg.rpc_argp = &calldata->arg;
6216         msg.rpc_resp = &calldata->res;
6217         task_setup_data.callback_data = calldata;
6218         task = rpc_run_task(&task_setup_data);
6219         if (IS_ERR(task)) {
6220                 status = PTR_ERR(task);
6221                 goto out;
6222         }
6223         status = nfs4_wait_for_completion_rpc_task(task);
6224         if (status == 0)
6225                 status = task->tk_status;
6226         rpc_put_task(task);
6227         return 0;
6228 out:
6229         dprintk("<-- %s status=%d\n", __func__, status);
6230         return status;
6231 }
6232
6233 static void
6234 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6235 {
6236         struct nfs4_layoutget *lgp = calldata;
6237         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6238         struct nfs4_session *session = nfs4_get_session(server);
6239
6240         dprintk("--> %s\n", __func__);
6241         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6242          * right now covering the LAYOUTGET we are about to send.
6243          * However, that is not so catastrophic, and there seems
6244          * to be no way to prevent it completely.
6245          */
6246         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6247                                 &lgp->res.seq_res, task))
6248                 return;
6249         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6250                                           NFS_I(lgp->args.inode)->layout,
6251                                           lgp->args.ctx->state)) {
6252                 rpc_exit(task, NFS4_OK);
6253         }
6254 }
6255
6256 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6257 {
6258         struct nfs4_layoutget *lgp = calldata;
6259         struct inode *inode = lgp->args.inode;
6260         struct nfs_server *server = NFS_SERVER(inode);
6261         struct pnfs_layout_hdr *lo;
6262         struct nfs4_state *state = NULL;
6263         unsigned long timeo, giveup;
6264
6265         dprintk("--> %s\n", __func__);
6266
6267         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6268                 goto out;
6269
6270         switch (task->tk_status) {
6271         case 0:
6272                 goto out;
6273         case -NFS4ERR_LAYOUTTRYLATER:
6274         case -NFS4ERR_RECALLCONFLICT:
6275                 timeo = rpc_get_timeout(task->tk_client);
6276                 giveup = lgp->args.timestamp + timeo;
6277                 if (time_after(giveup, jiffies))
6278                         task->tk_status = -NFS4ERR_DELAY;
6279                 break;
6280         case -NFS4ERR_EXPIRED:
6281         case -NFS4ERR_BAD_STATEID:
6282                 spin_lock(&inode->i_lock);
6283                 lo = NFS_I(inode)->layout;
6284                 if (!lo || list_empty(&lo->plh_segs)) {
6285                         spin_unlock(&inode->i_lock);
6286                         /* If the open stateid was bad, then recover it. */
6287                         state = lgp->args.ctx->state;
6288                 } else {
6289                         LIST_HEAD(head);
6290
6291                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6292                         spin_unlock(&inode->i_lock);
6293                         /* Mark the bad layout state as invalid, then
6294                          * retry using the open stateid. */
6295                         pnfs_free_lseg_list(&head);
6296                 }
6297         }
6298         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6299                 rpc_restart_call_prepare(task);
6300 out:
6301         dprintk("<-- %s\n", __func__);
6302 }
6303
6304 static size_t max_response_pages(struct nfs_server *server)
6305 {
6306         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6307         return nfs_page_array_len(0, max_resp_sz);
6308 }
6309
6310 static void nfs4_free_pages(struct page **pages, size_t size)
6311 {
6312         int i;
6313
6314         if (!pages)
6315                 return;
6316
6317         for (i = 0; i < size; i++) {
6318                 if (!pages[i])
6319                         break;
6320                 __free_page(pages[i]);
6321         }
6322         kfree(pages);
6323 }
6324
6325 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6326 {
6327         struct page **pages;
6328         int i;
6329
6330         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6331         if (!pages) {
6332                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6333                 return NULL;
6334         }
6335
6336         for (i = 0; i < size; i++) {
6337                 pages[i] = alloc_page(gfp_flags);
6338                 if (!pages[i]) {
6339                         dprintk("%s: failed to allocate page\n", __func__);
6340                         nfs4_free_pages(pages, size);
6341                         return NULL;
6342                 }
6343         }
6344
6345         return pages;
6346 }
6347
6348 static void nfs4_layoutget_release(void *calldata)
6349 {
6350         struct nfs4_layoutget *lgp = calldata;
6351         struct inode *inode = lgp->args.inode;
6352         struct nfs_server *server = NFS_SERVER(inode);
6353         size_t max_pages = max_response_pages(server);
6354
6355         dprintk("--> %s\n", __func__);
6356         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6357         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6358         put_nfs_open_context(lgp->args.ctx);
6359         kfree(calldata);
6360         dprintk("<-- %s\n", __func__);
6361 }
6362
6363 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6364         .rpc_call_prepare = nfs4_layoutget_prepare,
6365         .rpc_call_done = nfs4_layoutget_done,
6366         .rpc_release = nfs4_layoutget_release,
6367 };
6368
6369 struct pnfs_layout_segment *
6370 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6371 {
6372         struct inode *inode = lgp->args.inode;
6373         struct nfs_server *server = NFS_SERVER(inode);
6374         size_t max_pages = max_response_pages(server);
6375         struct rpc_task *task;
6376         struct rpc_message msg = {
6377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6378                 .rpc_argp = &lgp->args,
6379                 .rpc_resp = &lgp->res,
6380                 .rpc_cred = lgp->cred,
6381         };
6382         struct rpc_task_setup task_setup_data = {
6383                 .rpc_client = server->client,
6384                 .rpc_message = &msg,
6385                 .callback_ops = &nfs4_layoutget_call_ops,
6386                 .callback_data = lgp,
6387                 .flags = RPC_TASK_ASYNC,
6388         };
6389         struct pnfs_layout_segment *lseg = NULL;
6390         int status = 0;
6391
6392         dprintk("--> %s\n", __func__);
6393
6394         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6395         if (!lgp->args.layout.pages) {
6396                 nfs4_layoutget_release(lgp);
6397                 return ERR_PTR(-ENOMEM);
6398         }
6399         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6400         lgp->args.timestamp = jiffies;
6401
6402         lgp->res.layoutp = &lgp->args.layout;
6403         lgp->res.seq_res.sr_slot = NULL;
6404         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6405
6406         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6407         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6408
6409         task = rpc_run_task(&task_setup_data);
6410         if (IS_ERR(task))
6411                 return ERR_CAST(task);
6412         status = nfs4_wait_for_completion_rpc_task(task);
6413         if (status == 0)
6414                 status = task->tk_status;
6415         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6416         if (status == 0 && lgp->res.layoutp->len)
6417                 lseg = pnfs_layout_process(lgp);
6418         rpc_put_task(task);
6419         dprintk("<-- %s status=%d\n", __func__, status);
6420         if (status)
6421                 return ERR_PTR(status);
6422         return lseg;
6423 }
6424
6425 static void
6426 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6427 {
6428         struct nfs4_layoutreturn *lrp = calldata;
6429
6430         dprintk("--> %s\n", __func__);
6431         nfs41_setup_sequence(lrp->clp->cl_session,
6432                         &lrp->args.seq_args,
6433                         &lrp->res.seq_res,
6434                         task);
6435 }
6436
6437 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6438 {
6439         struct nfs4_layoutreturn *lrp = calldata;
6440         struct nfs_server *server;
6441
6442         dprintk("--> %s\n", __func__);
6443
6444         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6445                 return;
6446
6447         server = NFS_SERVER(lrp->args.inode);
6448         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6449                 rpc_restart_call_prepare(task);
6450                 return;
6451         }
6452         dprintk("<-- %s\n", __func__);
6453 }
6454
6455 static void nfs4_layoutreturn_release(void *calldata)
6456 {
6457         struct nfs4_layoutreturn *lrp = calldata;
6458         struct pnfs_layout_hdr *lo = lrp->args.layout;
6459
6460         dprintk("--> %s\n", __func__);
6461         spin_lock(&lo->plh_inode->i_lock);
6462         if (lrp->res.lrs_present)
6463                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6464         lo->plh_block_lgets--;
6465         spin_unlock(&lo->plh_inode->i_lock);
6466         pnfs_put_layout_hdr(lrp->args.layout);
6467         kfree(calldata);
6468         dprintk("<-- %s\n", __func__);
6469 }
6470
6471 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6472         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6473         .rpc_call_done = nfs4_layoutreturn_done,
6474         .rpc_release = nfs4_layoutreturn_release,
6475 };
6476
6477 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6478 {
6479         struct rpc_task *task;
6480         struct rpc_message msg = {
6481                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6482                 .rpc_argp = &lrp->args,
6483                 .rpc_resp = &lrp->res,
6484                 .rpc_cred = lrp->cred,
6485         };
6486         struct rpc_task_setup task_setup_data = {
6487                 .rpc_client = lrp->clp->cl_rpcclient,
6488                 .rpc_message = &msg,
6489                 .callback_ops = &nfs4_layoutreturn_call_ops,
6490                 .callback_data = lrp,
6491         };
6492         int status;
6493
6494         dprintk("--> %s\n", __func__);
6495         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6496         task = rpc_run_task(&task_setup_data);
6497         if (IS_ERR(task))
6498                 return PTR_ERR(task);
6499         status = task->tk_status;
6500         dprintk("<-- %s status=%d\n", __func__, status);
6501         rpc_put_task(task);
6502         return status;
6503 }
6504
6505 /*
6506  * Retrieve the list of Data Server devices from the MDS.
6507  */
6508 static int _nfs4_getdevicelist(struct nfs_server *server,
6509                                     const struct nfs_fh *fh,
6510                                     struct pnfs_devicelist *devlist)
6511 {
6512         struct nfs4_getdevicelist_args args = {
6513                 .fh = fh,
6514                 .layoutclass = server->pnfs_curr_ld->id,
6515         };
6516         struct nfs4_getdevicelist_res res = {
6517                 .devlist = devlist,
6518         };
6519         struct rpc_message msg = {
6520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6521                 .rpc_argp = &args,
6522                 .rpc_resp = &res,
6523         };
6524         int status;
6525
6526         dprintk("--> %s\n", __func__);
6527         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6528                                 &res.seq_res, 0);
6529         dprintk("<-- %s status=%d\n", __func__, status);
6530         return status;
6531 }
6532
6533 int nfs4_proc_getdevicelist(struct nfs_server *server,
6534                             const struct nfs_fh *fh,
6535                             struct pnfs_devicelist *devlist)
6536 {
6537         struct nfs4_exception exception = { };
6538         int err;
6539
6540         do {
6541                 err = nfs4_handle_exception(server,
6542                                 _nfs4_getdevicelist(server, fh, devlist),
6543                                 &exception);
6544         } while (exception.retry);
6545
6546         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6547                 err, devlist->num_devs);
6548
6549         return err;
6550 }
6551 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6552
6553 static int
6554 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
6555                 struct pnfs_device *pdev,
6556                 struct rpc_cred *cred)
6557 {
6558         struct nfs4_getdeviceinfo_args args = {
6559                 .pdev = pdev,
6560         };
6561         struct nfs4_getdeviceinfo_res res = {
6562                 .pdev = pdev,
6563         };
6564         struct rpc_message msg = {
6565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6566                 .rpc_argp = &args,
6567                 .rpc_resp = &res,
6568                 .rpc_cred = cred,
6569         };
6570         int status;
6571
6572         dprintk("--> %s\n", __func__);
6573         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6574         dprintk("<-- %s status=%d\n", __func__, status);
6575
6576         return status;
6577 }
6578
6579 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
6580                 struct pnfs_device *pdev,
6581                 struct rpc_cred *cred)
6582 {
6583         struct nfs4_exception exception = { };
6584         int err;
6585
6586         do {
6587                 err = nfs4_handle_exception(server,
6588                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
6589                                         &exception);
6590         } while (exception.retry);
6591         return err;
6592 }
6593 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6594
6595 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6596 {
6597         struct nfs4_layoutcommit_data *data = calldata;
6598         struct nfs_server *server = NFS_SERVER(data->args.inode);
6599         struct nfs4_session *session = nfs4_get_session(server);
6600
6601         nfs41_setup_sequence(session,
6602                         &data->args.seq_args,
6603                         &data->res.seq_res,
6604                         task);
6605 }
6606
6607 static void
6608 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6609 {
6610         struct nfs4_layoutcommit_data *data = calldata;
6611         struct nfs_server *server = NFS_SERVER(data->args.inode);
6612
6613         if (!nfs41_sequence_done(task, &data->res.seq_res))
6614                 return;
6615
6616         switch (task->tk_status) { /* Just ignore these failures */
6617         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6618         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6619         case -NFS4ERR_BADLAYOUT:     /* no layout */
6620         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6621                 task->tk_status = 0;
6622                 break;
6623         case 0:
6624                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6625                                                    data->res.fattr);
6626                 break;
6627         default:
6628                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6629                         rpc_restart_call_prepare(task);
6630                         return;
6631                 }
6632         }
6633 }
6634
6635 static void nfs4_layoutcommit_release(void *calldata)
6636 {
6637         struct nfs4_layoutcommit_data *data = calldata;
6638
6639         pnfs_cleanup_layoutcommit(data);
6640         put_rpccred(data->cred);
6641         kfree(data);
6642 }
6643
6644 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6645         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6646         .rpc_call_done = nfs4_layoutcommit_done,
6647         .rpc_release = nfs4_layoutcommit_release,
6648 };
6649
6650 int
6651 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6652 {
6653         struct rpc_message msg = {
6654                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6655                 .rpc_argp = &data->args,
6656                 .rpc_resp = &data->res,
6657                 .rpc_cred = data->cred,
6658         };
6659         struct rpc_task_setup task_setup_data = {
6660                 .task = &data->task,
6661                 .rpc_client = NFS_CLIENT(data->args.inode),
6662                 .rpc_message = &msg,
6663                 .callback_ops = &nfs4_layoutcommit_ops,
6664                 .callback_data = data,
6665                 .flags = RPC_TASK_ASYNC,
6666         };
6667         struct rpc_task *task;
6668         int status = 0;
6669
6670         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6671                 "lbw: %llu inode %lu\n",
6672                 data->task.tk_pid, sync,
6673                 data->args.lastbytewritten,
6674                 data->args.inode->i_ino);
6675
6676         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6677         task = rpc_run_task(&task_setup_data);
6678         if (IS_ERR(task))
6679                 return PTR_ERR(task);
6680         if (sync == false)
6681                 goto out;
6682         status = nfs4_wait_for_completion_rpc_task(task);
6683         if (status != 0)
6684                 goto out;
6685         status = task->tk_status;
6686 out:
6687         dprintk("%s: status %d\n", __func__, status);
6688         rpc_put_task(task);
6689         return status;
6690 }
6691
6692 static int
6693 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6694                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6695 {
6696         struct nfs41_secinfo_no_name_args args = {
6697                 .style = SECINFO_STYLE_CURRENT_FH,
6698         };
6699         struct nfs4_secinfo_res res = {
6700                 .flavors = flavors,
6701         };
6702         struct rpc_message msg = {
6703                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6704                 .rpc_argp = &args,
6705                 .rpc_resp = &res,
6706         };
6707         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6708 }
6709
6710 static int
6711 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6712                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6713 {
6714         struct nfs4_exception exception = { };
6715         int err;
6716         do {
6717                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6718                 switch (err) {
6719                 case 0:
6720                 case -NFS4ERR_WRONGSEC:
6721                 case -NFS4ERR_NOTSUPP:
6722                         goto out;
6723                 default:
6724                         err = nfs4_handle_exception(server, err, &exception);
6725                 }
6726         } while (exception.retry);
6727 out:
6728         return err;
6729 }
6730
6731 static int
6732 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6733                     struct nfs_fsinfo *info)
6734 {
6735         int err;
6736         struct page *page;
6737         rpc_authflavor_t flavor;
6738         struct nfs4_secinfo_flavors *flavors;
6739
6740         page = alloc_page(GFP_KERNEL);
6741         if (!page) {
6742                 err = -ENOMEM;
6743                 goto out;
6744         }
6745
6746         flavors = page_address(page);
6747         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6748
6749         /*
6750          * Fall back on "guess and check" method if
6751          * the server doesn't support SECINFO_NO_NAME
6752          */
6753         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6754                 err = nfs4_find_root_sec(server, fhandle, info);
6755                 goto out_freepage;
6756         }
6757         if (err)
6758                 goto out_freepage;
6759
6760         flavor = nfs_find_best_sec(flavors);
6761         if (err == 0)
6762                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6763
6764 out_freepage:
6765         put_page(page);
6766         if (err == -EACCES)
6767                 return -EPERM;
6768 out:
6769         return err;
6770 }
6771
6772 static int _nfs41_test_stateid(struct nfs_server *server,
6773                 nfs4_stateid *stateid,
6774                 struct rpc_cred *cred)
6775 {
6776         int status;
6777         struct nfs41_test_stateid_args args = {
6778                 .stateid = stateid,
6779         };
6780         struct nfs41_test_stateid_res res;
6781         struct rpc_message msg = {
6782                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6783                 .rpc_argp = &args,
6784                 .rpc_resp = &res,
6785                 .rpc_cred = cred,
6786         };
6787
6788         dprintk("NFS call  test_stateid %p\n", stateid);
6789         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6790         nfs4_set_sequence_privileged(&args.seq_args);
6791         status = nfs4_call_sync_sequence(server->client, server, &msg,
6792                         &args.seq_args, &res.seq_res);
6793         if (status != NFS_OK) {
6794                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6795                 return status;
6796         }
6797         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6798         return -res.status;
6799 }
6800
6801 /**
6802  * nfs41_test_stateid - perform a TEST_STATEID operation
6803  *
6804  * @server: server / transport on which to perform the operation
6805  * @stateid: state ID to test
6806  * @cred: credential
6807  *
6808  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6809  * Otherwise a negative NFS4ERR value is returned if the operation
6810  * failed or the state ID is not currently valid.
6811  */
6812 static int nfs41_test_stateid(struct nfs_server *server,
6813                 nfs4_stateid *stateid,
6814                 struct rpc_cred *cred)
6815 {
6816         struct nfs4_exception exception = { };
6817         int err;
6818         do {
6819                 err = _nfs41_test_stateid(server, stateid, cred);
6820                 if (err != -NFS4ERR_DELAY)
6821                         break;
6822                 nfs4_handle_exception(server, err, &exception);
6823         } while (exception.retry);
6824         return err;
6825 }
6826
6827 struct nfs_free_stateid_data {
6828         struct nfs_server *server;
6829         struct nfs41_free_stateid_args args;
6830         struct nfs41_free_stateid_res res;
6831 };
6832
6833 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
6834 {
6835         struct nfs_free_stateid_data *data = calldata;
6836         nfs41_setup_sequence(nfs4_get_session(data->server),
6837                         &data->args.seq_args,
6838                         &data->res.seq_res,
6839                         task);
6840 }
6841
6842 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
6843 {
6844         struct nfs_free_stateid_data *data = calldata;
6845
6846         nfs41_sequence_done(task, &data->res.seq_res);
6847
6848         switch (task->tk_status) {
6849         case -NFS4ERR_DELAY:
6850                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
6851                         rpc_restart_call_prepare(task);
6852         }
6853 }
6854
6855 static void nfs41_free_stateid_release(void *calldata)
6856 {
6857         kfree(calldata);
6858 }
6859
6860 const struct rpc_call_ops nfs41_free_stateid_ops = {
6861         .rpc_call_prepare = nfs41_free_stateid_prepare,
6862         .rpc_call_done = nfs41_free_stateid_done,
6863         .rpc_release = nfs41_free_stateid_release,
6864 };
6865
6866 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
6867                 nfs4_stateid *stateid,
6868                 struct rpc_cred *cred,
6869                 bool privileged)
6870 {
6871         struct rpc_message msg = {
6872                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6873                 .rpc_cred = cred,
6874         };
6875         struct rpc_task_setup task_setup = {
6876                 .rpc_client = server->client,
6877                 .rpc_message = &msg,
6878                 .callback_ops = &nfs41_free_stateid_ops,
6879                 .flags = RPC_TASK_ASYNC,
6880         };
6881         struct nfs_free_stateid_data *data;
6882
6883         dprintk("NFS call  free_stateid %p\n", stateid);
6884         data = kmalloc(sizeof(*data), GFP_NOFS);
6885         if (!data)
6886                 return ERR_PTR(-ENOMEM);
6887         data->server = server;
6888         nfs4_stateid_copy(&data->args.stateid, stateid);
6889
6890         task_setup.callback_data = data;
6891
6892         msg.rpc_argp = &data->args;
6893         msg.rpc_resp = &data->res;
6894         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6895         if (privileged)
6896                 nfs4_set_sequence_privileged(&data->args.seq_args);
6897
6898         return rpc_run_task(&task_setup);
6899 }
6900
6901 /**
6902  * nfs41_free_stateid - perform a FREE_STATEID operation
6903  *
6904  * @server: server / transport on which to perform the operation
6905  * @stateid: state ID to release
6906  * @cred: credential
6907  *
6908  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6909  * negative NFS4ERR value is returned.
6910  */
6911 static int nfs41_free_stateid(struct nfs_server *server,
6912                 nfs4_stateid *stateid,
6913                 struct rpc_cred *cred)
6914 {
6915         struct rpc_task *task;
6916         int ret;
6917
6918         task = _nfs41_free_stateid(server, stateid, cred, true);
6919         if (IS_ERR(task))
6920                 return PTR_ERR(task);
6921         ret = rpc_wait_for_completion_task(task);
6922         if (!ret)
6923                 ret = task->tk_status;
6924         rpc_put_task(task);
6925         return ret;
6926 }
6927
6928 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
6929 {
6930         struct rpc_task *task;
6931         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
6932
6933         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
6934         nfs4_free_lock_state(server, lsp);
6935         if (IS_ERR(task))
6936                 return PTR_ERR(task);
6937         rpc_put_task(task);
6938         return 0;
6939 }
6940
6941 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6942                 const nfs4_stateid *s2)
6943 {
6944         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6945                 return false;
6946
6947         if (s1->seqid == s2->seqid)
6948                 return true;
6949         if (s1->seqid == 0 || s2->seqid == 0)
6950                 return true;
6951
6952         return false;
6953 }
6954
6955 #endif /* CONFIG_NFS_V4_1 */
6956
6957 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6958                 const nfs4_stateid *s2)
6959 {
6960         return nfs4_stateid_match(s1, s2);
6961 }
6962
6963
6964 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6965         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6966         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6967         .recover_open   = nfs4_open_reclaim,
6968         .recover_lock   = nfs4_lock_reclaim,
6969         .establish_clid = nfs4_init_clientid,
6970         .get_clid_cred  = nfs4_get_setclientid_cred,
6971         .detect_trunking = nfs40_discover_server_trunking,
6972 };
6973
6974 #if defined(CONFIG_NFS_V4_1)
6975 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6976         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6977         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6978         .recover_open   = nfs4_open_reclaim,
6979         .recover_lock   = nfs4_lock_reclaim,
6980         .establish_clid = nfs41_init_clientid,
6981         .get_clid_cred  = nfs4_get_exchange_id_cred,
6982         .reclaim_complete = nfs41_proc_reclaim_complete,
6983         .detect_trunking = nfs41_discover_server_trunking,
6984 };
6985 #endif /* CONFIG_NFS_V4_1 */
6986
6987 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6988         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6989         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6990         .recover_open   = nfs4_open_expired,
6991         .recover_lock   = nfs4_lock_expired,
6992         .establish_clid = nfs4_init_clientid,
6993         .get_clid_cred  = nfs4_get_setclientid_cred,
6994 };
6995
6996 #if defined(CONFIG_NFS_V4_1)
6997 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6998         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6999         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7000         .recover_open   = nfs41_open_expired,
7001         .recover_lock   = nfs41_lock_expired,
7002         .establish_clid = nfs41_init_clientid,
7003         .get_clid_cred  = nfs4_get_exchange_id_cred,
7004 };
7005 #endif /* CONFIG_NFS_V4_1 */
7006
7007 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7008         .sched_state_renewal = nfs4_proc_async_renew,
7009         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7010         .renew_lease = nfs4_proc_renew,
7011 };
7012
7013 #if defined(CONFIG_NFS_V4_1)
7014 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7015         .sched_state_renewal = nfs41_proc_async_sequence,
7016         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7017         .renew_lease = nfs4_proc_sequence,
7018 };
7019 #endif
7020
7021 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7022         .minor_version = 0,
7023         .init_caps = NFS_CAP_READDIRPLUS
7024                 | NFS_CAP_ATOMIC_OPEN
7025                 | NFS_CAP_CHANGE_ATTR
7026                 | NFS_CAP_POSIX_LOCK,
7027         .call_sync = _nfs4_call_sync,
7028         .match_stateid = nfs4_match_stateid,
7029         .find_root_sec = nfs4_find_root_sec,
7030         .free_lock_state = nfs4_release_lockowner,
7031         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7032         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7033         .state_renewal_ops = &nfs40_state_renewal_ops,
7034 };
7035
7036 #if defined(CONFIG_NFS_V4_1)
7037 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7038         .minor_version = 1,
7039         .init_caps = NFS_CAP_READDIRPLUS
7040                 | NFS_CAP_ATOMIC_OPEN
7041                 | NFS_CAP_CHANGE_ATTR
7042                 | NFS_CAP_POSIX_LOCK
7043                 | NFS_CAP_STATEID_NFSV41
7044                 | NFS_CAP_ATOMIC_OPEN_V1,
7045         .call_sync = nfs4_call_sync_sequence,
7046         .match_stateid = nfs41_match_stateid,
7047         .find_root_sec = nfs41_find_root_sec,
7048         .free_lock_state = nfs41_free_lock_state,
7049         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7050         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7051         .state_renewal_ops = &nfs41_state_renewal_ops,
7052 };
7053 #endif
7054
7055 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7056         [0] = &nfs_v4_0_minor_ops,
7057 #if defined(CONFIG_NFS_V4_1)
7058         [1] = &nfs_v4_1_minor_ops,
7059 #endif
7060 };
7061
7062 const struct inode_operations nfs4_dir_inode_operations = {
7063         .create         = nfs_create,
7064         .lookup         = nfs_lookup,
7065         .atomic_open    = nfs_atomic_open,
7066         .link           = nfs_link,
7067         .unlink         = nfs_unlink,
7068         .symlink        = nfs_symlink,
7069         .mkdir          = nfs_mkdir,
7070         .rmdir          = nfs_rmdir,
7071         .mknod          = nfs_mknod,
7072         .rename         = nfs_rename,
7073         .permission     = nfs_permission,
7074         .getattr        = nfs_getattr,
7075         .setattr        = nfs_setattr,
7076         .getxattr       = generic_getxattr,
7077         .setxattr       = generic_setxattr,
7078         .listxattr      = generic_listxattr,
7079         .removexattr    = generic_removexattr,
7080 };
7081
7082 static const struct inode_operations nfs4_file_inode_operations = {
7083         .permission     = nfs_permission,
7084         .getattr        = nfs_getattr,
7085         .setattr        = nfs_setattr,
7086         .getxattr       = generic_getxattr,
7087         .setxattr       = generic_setxattr,
7088         .listxattr      = generic_listxattr,
7089         .removexattr    = generic_removexattr,
7090 };
7091
7092 const struct nfs_rpc_ops nfs_v4_clientops = {
7093         .version        = 4,                    /* protocol version */
7094         .dentry_ops     = &nfs4_dentry_operations,
7095         .dir_inode_ops  = &nfs4_dir_inode_operations,
7096         .file_inode_ops = &nfs4_file_inode_operations,
7097         .file_ops       = &nfs4_file_operations,
7098         .getroot        = nfs4_proc_get_root,
7099         .submount       = nfs4_submount,
7100         .try_mount      = nfs4_try_mount,
7101         .getattr        = nfs4_proc_getattr,
7102         .setattr        = nfs4_proc_setattr,
7103         .lookup         = nfs4_proc_lookup,
7104         .access         = nfs4_proc_access,
7105         .readlink       = nfs4_proc_readlink,
7106         .create         = nfs4_proc_create,
7107         .remove         = nfs4_proc_remove,
7108         .unlink_setup   = nfs4_proc_unlink_setup,
7109         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7110         .unlink_done    = nfs4_proc_unlink_done,
7111         .rename         = nfs4_proc_rename,
7112         .rename_setup   = nfs4_proc_rename_setup,
7113         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7114         .rename_done    = nfs4_proc_rename_done,
7115         .link           = nfs4_proc_link,
7116         .symlink        = nfs4_proc_symlink,
7117         .mkdir          = nfs4_proc_mkdir,
7118         .rmdir          = nfs4_proc_remove,
7119         .readdir        = nfs4_proc_readdir,
7120         .mknod          = nfs4_proc_mknod,
7121         .statfs         = nfs4_proc_statfs,
7122         .fsinfo         = nfs4_proc_fsinfo,
7123         .pathconf       = nfs4_proc_pathconf,
7124         .set_capabilities = nfs4_server_capabilities,
7125         .decode_dirent  = nfs4_decode_dirent,
7126         .read_setup     = nfs4_proc_read_setup,
7127         .read_pageio_init = pnfs_pageio_init_read,
7128         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7129         .read_done      = nfs4_read_done,
7130         .write_setup    = nfs4_proc_write_setup,
7131         .write_pageio_init = pnfs_pageio_init_write,
7132         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7133         .write_done     = nfs4_write_done,
7134         .commit_setup   = nfs4_proc_commit_setup,
7135         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7136         .commit_done    = nfs4_commit_done,
7137         .lock           = nfs4_proc_lock,
7138         .clear_acl_cache = nfs4_zap_acl_attr,
7139         .close_context  = nfs4_close_context,
7140         .open_context   = nfs4_atomic_open,
7141         .have_delegation = nfs4_have_delegation,
7142         .return_delegation = nfs4_inode_return_delegation,
7143         .alloc_client   = nfs4_alloc_client,
7144         .init_client    = nfs4_init_client,
7145         .free_client    = nfs4_free_client,
7146         .create_server  = nfs4_create_server,
7147         .clone_server   = nfs_clone_server,
7148 };
7149
7150 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7151         .prefix = XATTR_NAME_NFSV4_ACL,
7152         .list   = nfs4_xattr_list_nfs4_acl,
7153         .get    = nfs4_xattr_get_nfs4_acl,
7154         .set    = nfs4_xattr_set_nfs4_acl,
7155 };
7156
7157 const struct xattr_handler *nfs4_xattr_handlers[] = {
7158         &nfs4_xattr_nfs4_acl_handler,
7159         NULL
7160 };
7161
7162 /*
7163  * Local variables:
7164  *  c-basic-offset: 8
7165  * End:
7166  */