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/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.h"
  67
  68 #define NFSDBG_FACILITY         NFSDBG_PROC
  69
  70 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  71 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  72
  73 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  74
  75 static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
  76
  77 struct nfs4_opendata;
  78 static int _nfs4_proc_open(struct nfs4_opendata *data);
  79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  81 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  82 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state);
  87 #ifdef CONFIG_NFS_V4_1
  88 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  89 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  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                 return -EREMOTEIO;
  99         case -NFS4ERR_WRONGSEC:
 100                 return -EPERM;
 101         case -NFS4ERR_BADOWNER:
 102         case -NFS4ERR_BADNAME:
 103                 return -EINVAL;
 104         default:
 105                 dprintk("%s could not handle NFSv4 error %d\n",
 106                                 __func__, -err);
 107                 break;
 108         }
 109         return -EIO;
 110 }
 111
 112 /*
 113  * This is our standard bitmap for GETATTR requests.
 114  */
 115 const u32 nfs4_fattr_bitmap[2] = {
 116         FATTR4_WORD0_TYPE
 117         | FATTR4_WORD0_CHANGE
 118         | FATTR4_WORD0_SIZE
 119         | FATTR4_WORD0_FSID
 120         | FATTR4_WORD0_FILEID,
 121         FATTR4_WORD1_MODE
 122         | FATTR4_WORD1_NUMLINKS
 123         | FATTR4_WORD1_OWNER
 124         | FATTR4_WORD1_OWNER_GROUP
 125         | FATTR4_WORD1_RAWDEV
 126         | FATTR4_WORD1_SPACE_USED
 127         | FATTR4_WORD1_TIME_ACCESS
 128         | FATTR4_WORD1_TIME_METADATA
 129         | FATTR4_WORD1_TIME_MODIFY
 130 };
 131
 132 const u32 nfs4_statfs_bitmap[2] = {
 133         FATTR4_WORD0_FILES_AVAIL
 134         | FATTR4_WORD0_FILES_FREE
 135         | FATTR4_WORD0_FILES_TOTAL,
 136         FATTR4_WORD1_SPACE_AVAIL
 137         | FATTR4_WORD1_SPACE_FREE
 138         | FATTR4_WORD1_SPACE_TOTAL
 139 };
 140
 141 const u32 nfs4_pathconf_bitmap[2] = {
 142         FATTR4_WORD0_MAXLINK
 143         | FATTR4_WORD0_MAXNAME,
 144         0
 145 };
 146
 147 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 148                         | FATTR4_WORD0_MAXREAD
 149                         | FATTR4_WORD0_MAXWRITE
 150                         | FATTR4_WORD0_LEASE_TIME,
 151                         FATTR4_WORD1_TIME_DELTA
 152                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 153                         FATTR4_WORD2_LAYOUT_BLKSIZE
 154 };
 155
 156 const u32 nfs4_fs_locations_bitmap[2] = {
 157         FATTR4_WORD0_TYPE
 158         | FATTR4_WORD0_CHANGE
 159         | FATTR4_WORD0_SIZE
 160         | FATTR4_WORD0_FSID
 161         | FATTR4_WORD0_FILEID
 162         | FATTR4_WORD0_FS_LOCATIONS,
 163         FATTR4_WORD1_MODE
 164         | FATTR4_WORD1_NUMLINKS
 165         | FATTR4_WORD1_OWNER
 166         | FATTR4_WORD1_OWNER_GROUP
 167         | FATTR4_WORD1_RAWDEV
 168         | FATTR4_WORD1_SPACE_USED
 169         | FATTR4_WORD1_TIME_ACCESS
 170         | FATTR4_WORD1_TIME_METADATA
 171         | FATTR4_WORD1_TIME_MODIFY
 172         | FATTR4_WORD1_MOUNTED_ON_FILEID
 173 };
 174
 175 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 176                 struct nfs4_readdir_arg *readdir)
 177 {
 178         __be32 *start, *p;
 179
 180         BUG_ON(readdir->count < 80);
 181         if (cookie > 2) {
 182                 readdir->cookie = cookie;
 183                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 184                 return;
 185         }
 186
 187         readdir->cookie = 0;
 188         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 189         if (cookie == 2)
 190                 return;
 191
 192         /*
 193          * NFSv4 servers do not return entries for '.' and '..'
 194          * Therefore, we fake these entries here.  We let '.'
 195          * have cookie 0 and '..' have cookie 1.  Note that
 196          * when talking to the server, we always send cookie 0
 197          * instead of 1 or 2.
 198          */
 199         start = p = kmap_atomic(*readdir->pages);
 200
 201         if (cookie == 0) {
 202                 *p++ = xdr_one;                                  /* next */
 203                 *p++ = xdr_zero;                   /* cookie, first word */
 204                 *p++ = xdr_one;                   /* cookie, second word */
 205                 *p++ = xdr_one;                             /* entry len */
 206                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 207                 p++;
 208                 *p++ = xdr_one;                         /* bitmap length */
 209                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 210                 *p++ = htonl(8);              /* attribute buffer length */
 211                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 212         }
 213
 214         *p++ = xdr_one;                                  /* next */
 215         *p++ = xdr_zero;                   /* cookie, first word */
 216         *p++ = xdr_two;                   /* cookie, second word */
 217         *p++ = xdr_two;                             /* entry len */
 218         memcpy(p, "..\0\0", 4);                         /* entry */
 219         p++;
 220         *p++ = xdr_one;                         /* bitmap length */
 221         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 222         *p++ = htonl(8);              /* attribute buffer length */
 223         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 224
 225         readdir->pgbase = (char *)p - (char *)start;
 226         readdir->count -= readdir->pgbase;
 227         kunmap_atomic(start);
 228 }
 229
 230 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 231 {
 232         int res;
 233
 234         might_sleep();
 235
 236         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 237                         nfs_wait_bit_killable, TASK_KILLABLE);
 238         return res;
 239 }
 240
 241 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 242 {
 243         int res = 0;
 244
 245         might_sleep();
 246
 247         if (*timeout <= 0)
 248                 *timeout = NFS4_POLL_RETRY_MIN;
 249         if (*timeout > NFS4_POLL_RETRY_MAX)
 250                 *timeout = NFS4_POLL_RETRY_MAX;
 251         freezable_schedule_timeout_killable(*timeout);
 252         if (fatal_signal_pending(current))
 253                 res = -ERESTARTSYS;
 254         *timeout <<= 1;
 255         return res;
 256 }
 257
 258 /* This is the error handling routine for processes that are allowed
 259  * to sleep.
 260  */
 261 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 262 {
 263         struct nfs_client *clp = server->nfs_client;
 264         struct nfs4_state *state = exception->state;
 265         struct inode *inode = exception->inode;
 266         int ret = errorcode;
 267
 268         exception->retry = 0;
 269         switch(errorcode) {
 270                 case 0:
 271                         return 0;
 272                 case -NFS4ERR_OPENMODE:
 273                         if (inode && nfs_have_delegation(inode, FMODE_READ)) {
 274                                 nfs_inode_return_delegation(inode);
 275                                 exception->retry = 1;
 276                                 return 0;
 277                         }
 278                         if (state == NULL)
 279                                 break;
 280                         nfs4_schedule_stateid_recovery(server, state);
 281                         goto wait_on_recovery;
 282                 case -NFS4ERR_DELEG_REVOKED:
 283                 case -NFS4ERR_ADMIN_REVOKED:
 284                 case -NFS4ERR_BAD_STATEID:
 285                         if (state == NULL)
 286                                 break;
 287                         nfs_remove_bad_delegation(state->inode);
 288                         nfs4_schedule_stateid_recovery(server, state);
 289                         goto wait_on_recovery;
 290                 case -NFS4ERR_EXPIRED:
 291                         if (state != NULL)
 292                                 nfs4_schedule_stateid_recovery(server, state);
 293                 case -NFS4ERR_STALE_STATEID:
 294                 case -NFS4ERR_STALE_CLIENTID:
 295                         nfs4_schedule_lease_recovery(clp);
 296                         goto wait_on_recovery;
 297 #if defined(CONFIG_NFS_V4_1)
 298                 case -NFS4ERR_BADSESSION:
 299                 case -NFS4ERR_BADSLOT:
 300                 case -NFS4ERR_BAD_HIGH_SLOT:
 301                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 302                 case -NFS4ERR_DEADSESSION:
 303                 case -NFS4ERR_SEQ_FALSE_RETRY:
 304                 case -NFS4ERR_SEQ_MISORDERED:
 305                         dprintk("%s ERROR: %d Reset session\n", __func__,
 306                                 errorcode);
 307                         nfs4_schedule_session_recovery(clp->cl_session);
 308                         exception->retry = 1;
 309                         break;
 310 #endif /* defined(CONFIG_NFS_V4_1) */
 311                 case -NFS4ERR_FILE_OPEN:
 312                         if (exception->timeout > HZ) {
 313                                 /* We have retried a decent amount, time to
 314                                  * fail
 315                                  */
 316                                 ret = -EBUSY;
 317                                 break;
 318                         }
 319                 case -NFS4ERR_GRACE:
 320                 case -NFS4ERR_DELAY:
 321                 case -EKEYEXPIRED:
 322                         ret = nfs4_delay(server->client, &exception->timeout);
 323                         if (ret != 0)
 324                                 break;
 325                 case -NFS4ERR_RETRY_UNCACHED_REP:
 326                 case -NFS4ERR_OLD_STATEID:
 327                         exception->retry = 1;
 328                         break;
 329                 case -NFS4ERR_BADOWNER:
 330                         /* The following works around a Linux server bug! */
 331                 case -NFS4ERR_BADNAME:
 332                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 333                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 334                                 exception->retry = 1;
 335                                 printk(KERN_WARNING "NFS: v4 server %s "
 336                                                 "does not accept raw "
 337                                                 "uid/gids. "
 338                                                 "Reenabling the idmapper.\n",
 339                                                 server->nfs_client->cl_hostname);
 340                         }
 341         }
 342         /* We failed to handle the error */
 343         return nfs4_map_errors(ret);
 344 wait_on_recovery:
 345         ret = nfs4_wait_clnt_recover(clp);
 346         if (ret == 0)
 347                 exception->retry = 1;
 348         return ret;
 349 }
 350
 351
 352 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 353 {
 354         spin_lock(&clp->cl_lock);
 355         if (time_before(clp->cl_last_renewal,timestamp))
 356                 clp->cl_last_renewal = timestamp;
 357         spin_unlock(&clp->cl_lock);
 358 }
 359
 360 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 361 {
 362         do_renew_lease(server->nfs_client, timestamp);
 363 }
 364
 365 #if defined(CONFIG_NFS_V4_1)
 366
 367 /*
 368  * nfs4_free_slot - free a slot and efficiently update slot table.
 369  *
 370  * freeing a slot is trivially done by clearing its respective bit
 371  * in the bitmap.
 372  * If the freed slotid equals highest_used_slotid we want to update it
 373  * so that the server would be able to size down the slot table if needed,
 374  * otherwise we know that the highest_used_slotid is still in use.
 375  * When updating highest_used_slotid there may be "holes" in the bitmap
 376  * so we need to scan down from highest_used_slotid to 0 looking for the now
 377  * highest slotid in use.
 378  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 379  *
 380  * Must be called while holding tbl->slot_tbl_lock
 381  */
 382 static void
 383 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 384 {
 385         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 386         /* clear used bit in bitmap */
 387         __clear_bit(slotid, tbl->used_slots);
 388
 389         /* update highest_used_slotid when it is freed */
 390         if (slotid == tbl->highest_used_slotid) {
 391                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 392                 if (slotid < tbl->max_slots)
 393                         tbl->highest_used_slotid = slotid;
 394                 else
 395                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 396         }
 397         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 398                 slotid, tbl->highest_used_slotid);
 399 }
 400
 401 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 402 {
 403         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 404         return true;
 405 }
 406
 407 /*
 408  * Signal state manager thread if session fore channel is drained
 409  */
 410 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 411 {
 412         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 413                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 414                                 nfs4_set_task_privileged, NULL);
 415                 return;
 416         }
 417
 418         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 419                 return;
 420
 421         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 422         complete(&ses->fc_slot_table.complete);
 423 }
 424
 425 /*
 426  * Signal state manager thread if session back channel is drained
 427  */
 428 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 429 {
 430         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 431             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 432                 return;
 433         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 434         complete(&ses->bc_slot_table.complete);
 435 }
 436
 437 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 438 {
 439         struct nfs4_slot_table *tbl;
 440
 441         tbl = &res->sr_session->fc_slot_table;
 442         if (!res->sr_slot) {
 443                 /* just wake up the next guy waiting since
 444                  * we may have not consumed a slot after all */
 445                 dprintk("%s: No slot\n", __func__);
 446                 return;
 447         }
 448
 449         spin_lock(&tbl->slot_tbl_lock);
 450         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 451         nfs4_check_drain_fc_complete(res->sr_session);
 452         spin_unlock(&tbl->slot_tbl_lock);
 453         res->sr_slot = NULL;
 454 }
 455
 456 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 457 {
 458         unsigned long timestamp;
 459         struct nfs_client *clp;
 460
 461         /*
 462          * sr_status remains 1 if an RPC level error occurred. The server
 463          * may or may not have processed the sequence operation..
 464          * Proceed as if the server received and processed the sequence
 465          * operation.
 466          */
 467         if (res->sr_status == 1)
 468                 res->sr_status = NFS_OK;
 469
 470         /* don't increment the sequence number if the task wasn't sent */
 471         if (!RPC_WAS_SENT(task))
 472                 goto out;
 473
 474         /* Check the SEQUENCE operation status */
 475         switch (res->sr_status) {
 476         case 0:
 477                 /* Update the slot's sequence and clientid lease timer */
 478                 ++res->sr_slot->seq_nr;
 479                 timestamp = res->sr_renewal_time;
 480                 clp = res->sr_session->clp;
 481                 do_renew_lease(clp, timestamp);
 482                 /* Check sequence flags */
 483                 if (res->sr_status_flags != 0)
 484                         nfs4_schedule_lease_recovery(clp);
 485                 break;
 486         case -NFS4ERR_DELAY:
 487                 /* The server detected a resend of the RPC call and
 488                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 489                  * of RFC5661.
 490                  */
 491                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 492                         __func__,
 493                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 494                         res->sr_slot->seq_nr);
 495                 goto out_retry;
 496         default:
 497                 /* Just update the slot sequence no. */
 498                 ++res->sr_slot->seq_nr;
 499         }
 500 out:
 501         /* The session may be reset by one of the error handlers. */
 502         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 503         nfs41_sequence_free_slot(res);
 504         return 1;
 505 out_retry:
 506         if (!rpc_restart_call(task))
 507                 goto out;
 508         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 509         return 0;
 510 }
 511
 512 static int nfs4_sequence_done(struct rpc_task *task,
 513                                struct nfs4_sequence_res *res)
 514 {
 515         if (res->sr_session == NULL)
 516                 return 1;
 517         return nfs41_sequence_done(task, res);
 518 }
 519
 520 /*
 521  * nfs4_find_slot - efficiently look for a free slot
 522  *
 523  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 524  * If found, we mark the slot as used, update the highest_used_slotid,
 525  * and respectively set up the sequence operation args.
 526  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 527  *
 528  * Note: must be called with under the slot_tbl_lock.
 529  */
 530 static u32
 531 nfs4_find_slot(struct nfs4_slot_table *tbl)
 532 {
 533         u32 slotid;
 534         u32 ret_id = NFS4_NO_SLOT;
 535
 536         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 537                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 538                 tbl->max_slots);
 539         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 540         if (slotid >= tbl->max_slots)
 541                 goto out;
 542         __set_bit(slotid, tbl->used_slots);
 543         if (slotid > tbl->highest_used_slotid ||
 544                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 545                 tbl->highest_used_slotid = slotid;
 546         ret_id = slotid;
 547 out:
 548         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 549                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 550         return ret_id;
 551 }
 552
 553 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 554                 struct nfs4_sequence_res *res, int cache_reply)
 555 {
 556         args->sa_session = NULL;
 557         args->sa_cache_this = 0;
 558         if (cache_reply)
 559                 args->sa_cache_this = 1;
 560         res->sr_session = NULL;
 561         res->sr_slot = NULL;
 562 }
 563
 564 int nfs41_setup_sequence(struct nfs4_session *session,
 565                                 struct nfs4_sequence_args *args,
 566                                 struct nfs4_sequence_res *res,
 567                                 struct rpc_task *task)
 568 {
 569         struct nfs4_slot *slot;
 570         struct nfs4_slot_table *tbl;
 571         u32 slotid;
 572
 573         dprintk("--> %s\n", __func__);
 574         /* slot already allocated? */
 575         if (res->sr_slot != NULL)
 576                 return 0;
 577
 578         tbl = &session->fc_slot_table;
 579
 580         spin_lock(&tbl->slot_tbl_lock);
 581         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 582             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 583                 /* The state manager will wait until the slot table is empty */
 584                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 585                 spin_unlock(&tbl->slot_tbl_lock);
 586                 dprintk("%s session is draining\n", __func__);
 587                 return -EAGAIN;
 588         }
 589
 590         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 591             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 592                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 593                 spin_unlock(&tbl->slot_tbl_lock);
 594                 dprintk("%s enforce FIFO order\n", __func__);
 595                 return -EAGAIN;
 596         }
 597
 598         slotid = nfs4_find_slot(tbl);
 599         if (slotid == NFS4_NO_SLOT) {
 600                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 601                 spin_unlock(&tbl->slot_tbl_lock);
 602                 dprintk("<-- %s: no free slots\n", __func__);
 603                 return -EAGAIN;
 604         }
 605         spin_unlock(&tbl->slot_tbl_lock);
 606
 607         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 608         slot = tbl->slots + slotid;
 609         args->sa_session = session;
 610         args->sa_slotid = slotid;
 611
 612         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 613
 614         res->sr_session = session;
 615         res->sr_slot = slot;
 616         res->sr_renewal_time = jiffies;
 617         res->sr_status_flags = 0;
 618         /*
 619          * sr_status is only set in decode_sequence, and so will remain
 620          * set to 1 if an rpc level failure occurs.
 621          */
 622         res->sr_status = 1;
 623         return 0;
 624 }
 625 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 626
 627 int nfs4_setup_sequence(const struct nfs_server *server,
 628                         struct nfs4_sequence_args *args,
 629                         struct nfs4_sequence_res *res,
 630                         struct rpc_task *task)
 631 {
 632         struct nfs4_session *session = nfs4_get_session(server);
 633         int ret = 0;
 634
 635         if (session == NULL)
 636                 goto out;
 637
 638         dprintk("--> %s clp %p session %p sr_slot %td\n",
 639                 __func__, session->clp, session, res->sr_slot ?
 640                         res->sr_slot - session->fc_slot_table.slots : -1);
 641
 642         ret = nfs41_setup_sequence(session, args, res, task);
 643 out:
 644         dprintk("<-- %s status=%d\n", __func__, ret);
 645         return ret;
 646 }
 647
 648 struct nfs41_call_sync_data {
 649         const struct nfs_server *seq_server;
 650         struct nfs4_sequence_args *seq_args;
 651         struct nfs4_sequence_res *seq_res;
 652 };
 653
 654 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 655 {
 656         struct nfs41_call_sync_data *data = calldata;
 657
 658         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 659
 660         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 661                                 data->seq_res, task))
 662                 return;
 663         rpc_call_start(task);
 664 }
 665
 666 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 667 {
 668         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 669         nfs41_call_sync_prepare(task, calldata);
 670 }
 671
 672 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 673 {
 674         struct nfs41_call_sync_data *data = calldata;
 675
 676         nfs41_sequence_done(task, data->seq_res);
 677 }
 678
 679 static const struct rpc_call_ops nfs41_call_sync_ops = {
 680         .rpc_call_prepare = nfs41_call_sync_prepare,
 681         .rpc_call_done = nfs41_call_sync_done,
 682 };
 683
 684 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 685         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 686         .rpc_call_done = nfs41_call_sync_done,
 687 };
 688
 689 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 690                                    struct nfs_server *server,
 691                                    struct rpc_message *msg,
 692                                    struct nfs4_sequence_args *args,
 693                                    struct nfs4_sequence_res *res,
 694                                    int privileged)
 695 {
 696         int ret;
 697         struct rpc_task *task;
 698         struct nfs41_call_sync_data data = {
 699                 .seq_server = server,
 700                 .seq_args = args,
 701                 .seq_res = res,
 702         };
 703         struct rpc_task_setup task_setup = {
 704                 .rpc_client = clnt,
 705                 .rpc_message = msg,
 706                 .callback_ops = &nfs41_call_sync_ops,
 707                 .callback_data = &data
 708         };
 709
 710         if (privileged)
 711                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 712         task = rpc_run_task(&task_setup);
 713         if (IS_ERR(task))
 714                 ret = PTR_ERR(task);
 715         else {
 716                 ret = task->tk_status;
 717                 rpc_put_task(task);
 718         }
 719         return ret;
 720 }
 721
 722 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 723                             struct nfs_server *server,
 724                             struct rpc_message *msg,
 725                             struct nfs4_sequence_args *args,
 726                             struct nfs4_sequence_res *res,
 727                             int cache_reply)
 728 {
 729         nfs41_init_sequence(args, res, cache_reply);
 730         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 731 }
 732
 733 #else
 734 static inline
 735 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 736                 struct nfs4_sequence_res *res, int cache_reply)
 737 {
 738 }
 739
 740 static int nfs4_sequence_done(struct rpc_task *task,
 741                                struct nfs4_sequence_res *res)
 742 {
 743         return 1;
 744 }
 745 #endif /* CONFIG_NFS_V4_1 */
 746
 747 int _nfs4_call_sync(struct rpc_clnt *clnt,
 748                     struct nfs_server *server,
 749                     struct rpc_message *msg,
 750                     struct nfs4_sequence_args *args,
 751                     struct nfs4_sequence_res *res,
 752                     int cache_reply)
 753 {
 754         nfs41_init_sequence(args, res, cache_reply);
 755         return rpc_call_sync(clnt, msg, 0);
 756 }
 757
 758 static inline
 759 int nfs4_call_sync(struct rpc_clnt *clnt,
 760                    struct nfs_server *server,
 761                    struct rpc_message *msg,
 762                    struct nfs4_sequence_args *args,
 763                    struct nfs4_sequence_res *res,
 764                    int cache_reply)
 765 {
 766         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 767                                                 args, res, cache_reply);
 768 }
 769
 770 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 771 {
 772         struct nfs_inode *nfsi = NFS_I(dir);
 773
 774         spin_lock(&dir->i_lock);
 775         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 776         if (!cinfo->atomic || cinfo->before != dir->i_version)
 777                 nfs_force_lookup_revalidate(dir);
 778         dir->i_version = cinfo->after;
 779         spin_unlock(&dir->i_lock);
 780 }
 781
 782 struct nfs4_opendata {
 783         struct kref kref;
 784         struct nfs_openargs o_arg;
 785         struct nfs_openres o_res;
 786         struct nfs_open_confirmargs c_arg;
 787         struct nfs_open_confirmres c_res;
 788         struct nfs4_string owner_name;
 789         struct nfs4_string group_name;
 790         struct nfs_fattr f_attr;
 791         struct nfs_fattr dir_attr;
 792         struct dentry *dir;
 793         struct dentry *dentry;
 794         struct nfs4_state_owner *owner;
 795         struct nfs4_state *state;
 796         struct iattr attrs;
 797         unsigned long timestamp;
 798         unsigned int rpc_done : 1;
 799         int rpc_status;
 800         int cancelled;
 801 };
 802
 803
 804 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 805 {
 806         p->o_res.f_attr = &p->f_attr;
 807         p->o_res.dir_attr = &p->dir_attr;
 808         p->o_res.seqid = p->o_arg.seqid;
 809         p->c_res.seqid = p->c_arg.seqid;
 810         p->o_res.server = p->o_arg.server;
 811         nfs_fattr_init(&p->f_attr);
 812         nfs_fattr_init(&p->dir_attr);
 813         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 814 }
 815
 816 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 817                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 818                 const struct iattr *attrs,
 819                 gfp_t gfp_mask)
 820 {
 821         struct dentry *parent = dget_parent(dentry);
 822         struct inode *dir = parent->d_inode;
 823         struct nfs_server *server = NFS_SERVER(dir);
 824         struct nfs4_opendata *p;
 825
 826         p = kzalloc(sizeof(*p), gfp_mask);
 827         if (p == NULL)
 828                 goto err;
 829         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 830         if (p->o_arg.seqid == NULL)
 831                 goto err_free;
 832         nfs_sb_active(dentry->d_sb);
 833         p->dentry = dget(dentry);
 834         p->dir = parent;
 835         p->owner = sp;
 836         atomic_inc(&sp->so_count);
 837         p->o_arg.fh = NFS_FH(dir);
 838         p->o_arg.open_flags = flags;
 839         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 840         p->o_arg.clientid = server->nfs_client->cl_clientid;
 841         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 842         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 843         p->o_arg.name = &dentry->d_name;
 844         p->o_arg.server = server;
 845         p->o_arg.bitmask = server->attr_bitmask;
 846         p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
 847         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 848         if (attrs != NULL && attrs->ia_valid != 0) {
 849                 __be32 verf[2];
 850
 851                 p->o_arg.u.attrs = &p->attrs;
 852                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 853
 854                 verf[0] = jiffies;
 855                 verf[1] = current->pid;
 856                 memcpy(p->o_arg.u.verifier.data, verf,
 857                                 sizeof(p->o_arg.u.verifier.data));
 858         }
 859         p->c_arg.fh = &p->o_res.fh;
 860         p->c_arg.stateid = &p->o_res.stateid;
 861         p->c_arg.seqid = p->o_arg.seqid;
 862         nfs4_init_opendata_res(p);
 863         kref_init(&p->kref);
 864         return p;
 865 err_free:
 866         kfree(p);
 867 err:
 868         dput(parent);
 869         return NULL;
 870 }
 871
 872 static void nfs4_opendata_free(struct kref *kref)
 873 {
 874         struct nfs4_opendata *p = container_of(kref,
 875                         struct nfs4_opendata, kref);
 876         struct super_block *sb = p->dentry->d_sb;
 877
 878         nfs_free_seqid(p->o_arg.seqid);
 879         if (p->state != NULL)
 880                 nfs4_put_open_state(p->state);
 881         nfs4_put_state_owner(p->owner);
 882         dput(p->dir);
 883         dput(p->dentry);
 884         nfs_sb_deactive(sb);
 885         nfs_fattr_free_names(&p->f_attr);
 886         kfree(p);
 887 }
 888
 889 static void nfs4_opendata_put(struct nfs4_opendata *p)
 890 {
 891         if (p != NULL)
 892                 kref_put(&p->kref, nfs4_opendata_free);
 893 }
 894
 895 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 896 {
 897         int ret;
 898
 899         ret = rpc_wait_for_completion_task(task);
 900         return ret;
 901 }
 902
 903 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 904 {
 905         int ret = 0;
 906
 907         if (open_mode & (O_EXCL|O_TRUNC))
 908                 goto out;
 909         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 910                 case FMODE_READ:
 911                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 912                                 && state->n_rdonly != 0;
 913                         break;
 914                 case FMODE_WRITE:
 915                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 916                                 && state->n_wronly != 0;
 917                         break;
 918                 case FMODE_READ|FMODE_WRITE:
 919                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 920                                 && state->n_rdwr != 0;
 921         }
 922 out:
 923         return ret;
 924 }
 925
 926 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 927 {
 928         if (delegation == NULL)
 929                 return 0;
 930         if ((delegation->type & fmode) != fmode)
 931                 return 0;
 932         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 933                 return 0;
 934         nfs_mark_delegation_referenced(delegation);
 935         return 1;
 936 }
 937
 938 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 939 {
 940         switch (fmode) {
 941                 case FMODE_WRITE:
 942                         state->n_wronly++;
 943                         break;
 944                 case FMODE_READ:
 945                         state->n_rdonly++;
 946                         break;
 947                 case FMODE_READ|FMODE_WRITE:
 948                         state->n_rdwr++;
 949         }
 950         nfs4_state_set_mode_locked(state, state->state | fmode);
 951 }
 952
 953 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 954 {
 955         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 956                 nfs4_stateid_copy(&state->stateid, stateid);
 957         nfs4_stateid_copy(&state->open_stateid, stateid);
 958         switch (fmode) {
 959                 case FMODE_READ:
 960                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 961                         break;
 962                 case FMODE_WRITE:
 963                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 964                         break;
 965                 case FMODE_READ|FMODE_WRITE:
 966                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 967         }
 968 }
 969
 970 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 971 {
 972         write_seqlock(&state->seqlock);
 973         nfs_set_open_stateid_locked(state, stateid, fmode);
 974         write_sequnlock(&state->seqlock);
 975 }
 976
 977 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 978 {
 979         /*
 980          * Protect the call to nfs4_state_set_mode_locked and
 981          * serialise the stateid update
 982          */
 983         write_seqlock(&state->seqlock);
 984         if (deleg_stateid != NULL) {
 985                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 986                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 987         }
 988         if (open_stateid != NULL)
 989                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 990         write_sequnlock(&state->seqlock);
 991         spin_lock(&state->owner->so_lock);
 992         update_open_stateflags(state, fmode);
 993         spin_unlock(&state->owner->so_lock);
 994 }
 995
 996 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 997 {
 998         struct nfs_inode *nfsi = NFS_I(state->inode);
 999         struct nfs_delegation *deleg_cur;
1000         int ret = 0;
1001
1002         fmode &= (FMODE_READ|FMODE_WRITE);
1003
1004         rcu_read_lock();
1005         deleg_cur = rcu_dereference(nfsi->delegation);
1006         if (deleg_cur == NULL)
1007                 goto no_delegation;
1008
1009         spin_lock(&deleg_cur->lock);
1010         if (nfsi->delegation != deleg_cur ||
1011             (deleg_cur->type & fmode) != fmode)
1012                 goto no_delegation_unlock;
1013
1014         if (delegation == NULL)
1015                 delegation = &deleg_cur->stateid;
1016         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1017                 goto no_delegation_unlock;
1018
1019         nfs_mark_delegation_referenced(deleg_cur);
1020         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1021         ret = 1;
1022 no_delegation_unlock:
1023         spin_unlock(&deleg_cur->lock);
1024 no_delegation:
1025         rcu_read_unlock();
1026
1027         if (!ret && open_stateid != NULL) {
1028                 __update_open_stateid(state, open_stateid, NULL, fmode);
1029                 ret = 1;
1030         }
1031
1032         return ret;
1033 }
1034
1035
1036 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1037 {
1038         struct nfs_delegation *delegation;
1039
1040         rcu_read_lock();
1041         delegation = rcu_dereference(NFS_I(inode)->delegation);
1042         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1043                 rcu_read_unlock();
1044                 return;
1045         }
1046         rcu_read_unlock();
1047         nfs_inode_return_delegation(inode);
1048 }
1049
1050 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1051 {
1052         struct nfs4_state *state = opendata->state;
1053         struct nfs_inode *nfsi = NFS_I(state->inode);
1054         struct nfs_delegation *delegation;
1055         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1056         fmode_t fmode = opendata->o_arg.fmode;
1057         nfs4_stateid stateid;
1058         int ret = -EAGAIN;
1059
1060         for (;;) {
1061                 if (can_open_cached(state, fmode, open_mode)) {
1062                         spin_lock(&state->owner->so_lock);
1063                         if (can_open_cached(state, fmode, open_mode)) {
1064                                 update_open_stateflags(state, fmode);
1065                                 spin_unlock(&state->owner->so_lock);
1066                                 goto out_return_state;
1067                         }
1068                         spin_unlock(&state->owner->so_lock);
1069                 }
1070                 rcu_read_lock();
1071                 delegation = rcu_dereference(nfsi->delegation);
1072                 if (!can_open_delegated(delegation, fmode)) {
1073                         rcu_read_unlock();
1074                         break;
1075                 }
1076                 /* Save the delegation */
1077                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1078                 rcu_read_unlock();
1079                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1080                 if (ret != 0)
1081                         goto out;
1082                 ret = -EAGAIN;
1083
1084                 /* Try to update the stateid using the delegation */
1085                 if (update_open_stateid(state, NULL, &stateid, fmode))
1086                         goto out_return_state;
1087         }
1088 out:
1089         return ERR_PTR(ret);
1090 out_return_state:
1091         atomic_inc(&state->count);
1092         return state;
1093 }
1094
1095 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1096 {
1097         struct inode *inode;
1098         struct nfs4_state *state = NULL;
1099         struct nfs_delegation *delegation;
1100         int ret;
1101
1102         if (!data->rpc_done) {
1103                 state = nfs4_try_open_cached(data);
1104                 goto out;
1105         }
1106
1107         ret = -EAGAIN;
1108         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1109                 goto err;
1110         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1111         ret = PTR_ERR(inode);
1112         if (IS_ERR(inode))
1113                 goto err;
1114         ret = -ENOMEM;
1115         state = nfs4_get_open_state(inode, data->owner);
1116         if (state == NULL)
1117                 goto err_put_inode;
1118         if (data->o_res.delegation_type != 0) {
1119                 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1120                 int delegation_flags = 0;
1121
1122                 rcu_read_lock();
1123                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1124                 if (delegation)
1125                         delegation_flags = delegation->flags;
1126                 rcu_read_unlock();
1127                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1128                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1129                                         "returning a delegation for "
1130                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1131                                         clp->cl_hostname);
1132                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1133                         nfs_inode_set_delegation(state->inode,
1134                                         data->owner->so_cred,
1135                                         &data->o_res);
1136                 else
1137                         nfs_inode_reclaim_delegation(state->inode,
1138                                         data->owner->so_cred,
1139                                         &data->o_res);
1140         }
1141
1142         update_open_stateid(state, &data->o_res.stateid, NULL,
1143                         data->o_arg.fmode);
1144         iput(inode);
1145 out:
1146         return state;
1147 err_put_inode:
1148         iput(inode);
1149 err:
1150         return ERR_PTR(ret);
1151 }
1152
1153 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1154 {
1155         struct nfs_inode *nfsi = NFS_I(state->inode);
1156         struct nfs_open_context *ctx;
1157
1158         spin_lock(&state->inode->i_lock);
1159         list_for_each_entry(ctx, &nfsi->open_files, list) {
1160                 if (ctx->state != state)
1161                         continue;
1162                 get_nfs_open_context(ctx);
1163                 spin_unlock(&state->inode->i_lock);
1164                 return ctx;
1165         }
1166         spin_unlock(&state->inode->i_lock);
1167         return ERR_PTR(-ENOENT);
1168 }
1169
1170 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1171 {
1172         struct nfs4_opendata *opendata;
1173
1174         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1175         if (opendata == NULL)
1176                 return ERR_PTR(-ENOMEM);
1177         opendata->state = state;
1178         atomic_inc(&state->count);
1179         return opendata;
1180 }
1181
1182 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1183 {
1184         struct nfs4_state *newstate;
1185         int ret;
1186
1187         opendata->o_arg.open_flags = 0;
1188         opendata->o_arg.fmode = fmode;
1189         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1190         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1191         nfs4_init_opendata_res(opendata);
1192         ret = _nfs4_recover_proc_open(opendata);
1193         if (ret != 0)
1194                 return ret;
1195         newstate = nfs4_opendata_to_nfs4_state(opendata);
1196         if (IS_ERR(newstate))
1197                 return PTR_ERR(newstate);
1198         nfs4_close_state(newstate, fmode);
1199         *res = newstate;
1200         return 0;
1201 }
1202
1203 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1204 {
1205         struct nfs4_state *newstate;
1206         int ret;
1207
1208         /* memory barrier prior to reading state->n_* */
1209         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1210         smp_rmb();
1211         if (state->n_rdwr != 0) {
1212                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1213                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1214                 if (ret != 0)
1215                         return ret;
1216                 if (newstate != state)
1217                         return -ESTALE;
1218         }
1219         if (state->n_wronly != 0) {
1220                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1221                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1222                 if (ret != 0)
1223                         return ret;
1224                 if (newstate != state)
1225                         return -ESTALE;
1226         }
1227         if (state->n_rdonly != 0) {
1228                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1229                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1230                 if (ret != 0)
1231                         return ret;
1232                 if (newstate != state)
1233                         return -ESTALE;
1234         }
1235         /*
1236          * We may have performed cached opens for all three recoveries.
1237          * Check if we need to update the current stateid.
1238          */
1239         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1240             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1241                 write_seqlock(&state->seqlock);
1242                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1243                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1244                 write_sequnlock(&state->seqlock);
1245         }
1246         return 0;
1247 }
1248
1249 /*
1250  * OPEN_RECLAIM:
1251  *      reclaim state on the server after a reboot.
1252  */
1253 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1254 {
1255         struct nfs_delegation *delegation;
1256         struct nfs4_opendata *opendata;
1257         fmode_t delegation_type = 0;
1258         int status;
1259
1260         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1261         if (IS_ERR(opendata))
1262                 return PTR_ERR(opendata);
1263         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1264         opendata->o_arg.fh = NFS_FH(state->inode);
1265         rcu_read_lock();
1266         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1267         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1268                 delegation_type = delegation->type;
1269         rcu_read_unlock();
1270         opendata->o_arg.u.delegation_type = delegation_type;
1271         status = nfs4_open_recover(opendata, state);
1272         nfs4_opendata_put(opendata);
1273         return status;
1274 }
1275
1276 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1277 {
1278         struct nfs_server *server = NFS_SERVER(state->inode);
1279         struct nfs4_exception exception = { };
1280         int err;
1281         do {
1282                 err = _nfs4_do_open_reclaim(ctx, state);
1283                 if (err != -NFS4ERR_DELAY)
1284                         break;
1285                 nfs4_handle_exception(server, err, &exception);
1286         } while (exception.retry);
1287         return err;
1288 }
1289
1290 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1291 {
1292         struct nfs_open_context *ctx;
1293         int ret;
1294
1295         ctx = nfs4_state_find_open_context(state);
1296         if (IS_ERR(ctx))
1297                 return PTR_ERR(ctx);
1298         ret = nfs4_do_open_reclaim(ctx, state);
1299         put_nfs_open_context(ctx);
1300         return ret;
1301 }
1302
1303 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1304 {
1305         struct nfs4_opendata *opendata;
1306         int ret;
1307
1308         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1309         if (IS_ERR(opendata))
1310                 return PTR_ERR(opendata);
1311         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1312         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1313         ret = nfs4_open_recover(opendata, state);
1314         nfs4_opendata_put(opendata);
1315         return ret;
1316 }
1317
1318 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1319 {
1320         struct nfs4_exception exception = { };
1321         struct nfs_server *server = NFS_SERVER(state->inode);
1322         int err;
1323         do {
1324                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1325                 switch (err) {
1326                         case 0:
1327                         case -ENOENT:
1328                         case -ESTALE:
1329                                 goto out;
1330                         case -NFS4ERR_BADSESSION:
1331                         case -NFS4ERR_BADSLOT:
1332                         case -NFS4ERR_BAD_HIGH_SLOT:
1333                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1334                         case -NFS4ERR_DEADSESSION:
1335                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1336                                 goto out;
1337                         case -NFS4ERR_STALE_CLIENTID:
1338                         case -NFS4ERR_STALE_STATEID:
1339                         case -NFS4ERR_EXPIRED:
1340                                 /* Don't recall a delegation if it was lost */
1341                                 nfs4_schedule_lease_recovery(server->nfs_client);
1342                                 goto out;
1343                         case -ERESTARTSYS:
1344                                 /*
1345                                  * The show must go on: exit, but mark the
1346                                  * stateid as needing recovery.
1347                                  */
1348                         case -NFS4ERR_DELEG_REVOKED:
1349                         case -NFS4ERR_ADMIN_REVOKED:
1350                         case -NFS4ERR_BAD_STATEID:
1351                                 nfs_inode_find_state_and_recover(state->inode,
1352                                                 stateid);
1353                                 nfs4_schedule_stateid_recovery(server, state);
1354                         case -EKEYEXPIRED:
1355                                 /*
1356                                  * User RPCSEC_GSS context has expired.
1357                                  * We cannot recover this stateid now, so
1358                                  * skip it and allow recovery thread to
1359                                  * proceed.
1360                                  */
1361                         case -ENOMEM:
1362                                 err = 0;
1363                                 goto out;
1364                 }
1365                 err = nfs4_handle_exception(server, err, &exception);
1366         } while (exception.retry);
1367 out:
1368         return err;
1369 }
1370
1371 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1372 {
1373         struct nfs4_opendata *data = calldata;
1374
1375         data->rpc_status = task->tk_status;
1376         if (data->rpc_status == 0) {
1377                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1378                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1379                 renew_lease(data->o_res.server, data->timestamp);
1380                 data->rpc_done = 1;
1381         }
1382 }
1383
1384 static void nfs4_open_confirm_release(void *calldata)
1385 {
1386         struct nfs4_opendata *data = calldata;
1387         struct nfs4_state *state = NULL;
1388
1389         /* If this request hasn't been cancelled, do nothing */
1390         if (data->cancelled == 0)
1391                 goto out_free;
1392         /* In case of error, no cleanup! */
1393         if (!data->rpc_done)
1394                 goto out_free;
1395         state = nfs4_opendata_to_nfs4_state(data);
1396         if (!IS_ERR(state))
1397                 nfs4_close_state(state, data->o_arg.fmode);
1398 out_free:
1399         nfs4_opendata_put(data);
1400 }
1401
1402 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1403         .rpc_call_done = nfs4_open_confirm_done,
1404         .rpc_release = nfs4_open_confirm_release,
1405 };
1406
1407 /*
1408  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1409  */
1410 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1411 {
1412         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1413         struct rpc_task *task;
1414         struct  rpc_message msg = {
1415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1416                 .rpc_argp = &data->c_arg,
1417                 .rpc_resp = &data->c_res,
1418                 .rpc_cred = data->owner->so_cred,
1419         };
1420         struct rpc_task_setup task_setup_data = {
1421                 .rpc_client = server->client,
1422                 .rpc_message = &msg,
1423                 .callback_ops = &nfs4_open_confirm_ops,
1424                 .callback_data = data,
1425                 .workqueue = nfsiod_workqueue,
1426                 .flags = RPC_TASK_ASYNC,
1427         };
1428         int status;
1429
1430         kref_get(&data->kref);
1431         data->rpc_done = 0;
1432         data->rpc_status = 0;
1433         data->timestamp = jiffies;
1434         task = rpc_run_task(&task_setup_data);
1435         if (IS_ERR(task))
1436                 return PTR_ERR(task);
1437         status = nfs4_wait_for_completion_rpc_task(task);
1438         if (status != 0) {
1439                 data->cancelled = 1;
1440                 smp_wmb();
1441         } else
1442                 status = data->rpc_status;
1443         rpc_put_task(task);
1444         return status;
1445 }
1446
1447 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1448 {
1449         struct nfs4_opendata *data = calldata;
1450         struct nfs4_state_owner *sp = data->owner;
1451
1452         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1453                 return;
1454         /*
1455          * Check if we still need to send an OPEN call, or if we can use
1456          * a delegation instead.
1457          */
1458         if (data->state != NULL) {
1459                 struct nfs_delegation *delegation;
1460
1461                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1462                         goto out_no_action;
1463                 rcu_read_lock();
1464                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1465                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1466                     can_open_delegated(delegation, data->o_arg.fmode))
1467                         goto unlock_no_action;
1468                 rcu_read_unlock();
1469         }
1470         /* Update client id. */
1471         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1472         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1473                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1474                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1475         }
1476         data->timestamp = jiffies;
1477         if (nfs4_setup_sequence(data->o_arg.server,
1478                                 &data->o_arg.seq_args,
1479                                 &data->o_res.seq_res, task))
1480                 return;
1481         rpc_call_start(task);
1482         return;
1483 unlock_no_action:
1484         rcu_read_unlock();
1485 out_no_action:
1486         task->tk_action = NULL;
1487
1488 }
1489
1490 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1491 {
1492         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1493         nfs4_open_prepare(task, calldata);
1494 }
1495
1496 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1497 {
1498         struct nfs4_opendata *data = calldata;
1499
1500         data->rpc_status = task->tk_status;
1501
1502         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1503                 return;
1504
1505         if (task->tk_status == 0) {
1506                 switch (data->o_res.f_attr->mode & S_IFMT) {
1507                         case S_IFREG:
1508                                 break;
1509                         case S_IFLNK:
1510                                 data->rpc_status = -ELOOP;
1511                                 break;
1512                         case S_IFDIR:
1513                                 data->rpc_status = -EISDIR;
1514                                 break;
1515                         default:
1516                                 data->rpc_status = -ENOTDIR;
1517                 }
1518                 renew_lease(data->o_res.server, data->timestamp);
1519                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1520                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1521         }
1522         data->rpc_done = 1;
1523 }
1524
1525 static void nfs4_open_release(void *calldata)
1526 {
1527         struct nfs4_opendata *data = calldata;
1528         struct nfs4_state *state = NULL;
1529
1530         /* If this request hasn't been cancelled, do nothing */
1531         if (data->cancelled == 0)
1532                 goto out_free;
1533         /* In case of error, no cleanup! */
1534         if (data->rpc_status != 0 || !data->rpc_done)
1535                 goto out_free;
1536         /* In case we need an open_confirm, no cleanup! */
1537         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1538                 goto out_free;
1539         state = nfs4_opendata_to_nfs4_state(data);
1540         if (!IS_ERR(state))
1541                 nfs4_close_state(state, data->o_arg.fmode);
1542 out_free:
1543         nfs4_opendata_put(data);
1544 }
1545
1546 static const struct rpc_call_ops nfs4_open_ops = {
1547         .rpc_call_prepare = nfs4_open_prepare,
1548         .rpc_call_done = nfs4_open_done,
1549         .rpc_release = nfs4_open_release,
1550 };
1551
1552 static const struct rpc_call_ops nfs4_recover_open_ops = {
1553         .rpc_call_prepare = nfs4_recover_open_prepare,
1554         .rpc_call_done = nfs4_open_done,
1555         .rpc_release = nfs4_open_release,
1556 };
1557
1558 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1559 {
1560         struct inode *dir = data->dir->d_inode;
1561         struct nfs_server *server = NFS_SERVER(dir);
1562         struct nfs_openargs *o_arg = &data->o_arg;
1563         struct nfs_openres *o_res = &data->o_res;
1564         struct rpc_task *task;
1565         struct rpc_message msg = {
1566                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1567                 .rpc_argp = o_arg,
1568                 .rpc_resp = o_res,
1569                 .rpc_cred = data->owner->so_cred,
1570         };
1571         struct rpc_task_setup task_setup_data = {
1572                 .rpc_client = server->client,
1573                 .rpc_message = &msg,
1574                 .callback_ops = &nfs4_open_ops,
1575                 .callback_data = data,
1576                 .workqueue = nfsiod_workqueue,
1577                 .flags = RPC_TASK_ASYNC,
1578         };
1579         int status;
1580
1581         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1582         kref_get(&data->kref);
1583         data->rpc_done = 0;
1584         data->rpc_status = 0;
1585         data->cancelled = 0;
1586         if (isrecover)
1587                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1588         task = rpc_run_task(&task_setup_data);
1589         if (IS_ERR(task))
1590                 return PTR_ERR(task);
1591         status = nfs4_wait_for_completion_rpc_task(task);
1592         if (status != 0) {
1593                 data->cancelled = 1;
1594                 smp_wmb();
1595         } else
1596                 status = data->rpc_status;
1597         rpc_put_task(task);
1598
1599         return status;
1600 }
1601
1602 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1603 {
1604         struct inode *dir = data->dir->d_inode;
1605         struct nfs_openres *o_res = &data->o_res;
1606         int status;
1607
1608         status = nfs4_run_open_task(data, 1);
1609         if (status != 0 || !data->rpc_done)
1610                 return status;
1611
1612         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1613
1614         nfs_refresh_inode(dir, o_res->dir_attr);
1615
1616         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1617                 status = _nfs4_proc_open_confirm(data);
1618                 if (status != 0)
1619                         return status;
1620         }
1621
1622         return status;
1623 }
1624
1625 /*
1626  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1627  */
1628 static int _nfs4_proc_open(struct nfs4_opendata *data)
1629 {
1630         struct inode *dir = data->dir->d_inode;
1631         struct nfs_server *server = NFS_SERVER(dir);
1632         struct nfs_openargs *o_arg = &data->o_arg;
1633         struct nfs_openres *o_res = &data->o_res;
1634         int status;
1635
1636         status = nfs4_run_open_task(data, 0);
1637         if (!data->rpc_done)
1638                 return status;
1639         if (status != 0) {
1640                 if (status == -NFS4ERR_BADNAME &&
1641                                 !(o_arg->open_flags & O_CREAT))
1642                         return -ENOENT;
1643                 return status;
1644         }
1645
1646         nfs_fattr_map_and_free_names(server, &data->f_attr);
1647
1648         if (o_arg->open_flags & O_CREAT) {
1649                 update_changeattr(dir, &o_res->cinfo);
1650                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1651         } else
1652                 nfs_refresh_inode(dir, o_res->dir_attr);
1653         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1654                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1655         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1656                 status = _nfs4_proc_open_confirm(data);
1657                 if (status != 0)
1658                         return status;
1659         }
1660         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1661                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1662         return 0;
1663 }
1664
1665 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1666 {
1667         unsigned int loop;
1668         int ret;
1669
1670         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1671                 ret = nfs4_wait_clnt_recover(clp);
1672                 if (ret != 0)
1673                         break;
1674                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1675                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1676                         break;
1677                 nfs4_schedule_state_manager(clp);
1678                 ret = -EIO;
1679         }
1680         return ret;
1681 }
1682
1683 static int nfs4_recover_expired_lease(struct nfs_server *server)
1684 {
1685         return nfs4_client_recover_expired_lease(server->nfs_client);
1686 }
1687
1688 /*
1689  * OPEN_EXPIRED:
1690  *      reclaim state on the server after a network partition.
1691  *      Assumes caller holds the appropriate lock
1692  */
1693 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1694 {
1695         struct nfs4_opendata *opendata;
1696         int ret;
1697
1698         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1699         if (IS_ERR(opendata))
1700                 return PTR_ERR(opendata);
1701         ret = nfs4_open_recover(opendata, state);
1702         if (ret == -ESTALE)
1703                 d_drop(ctx->dentry);
1704         nfs4_opendata_put(opendata);
1705         return ret;
1706 }
1707
1708 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1709 {
1710         struct nfs_server *server = NFS_SERVER(state->inode);
1711         struct nfs4_exception exception = { };
1712         int err;
1713
1714         do {
1715                 err = _nfs4_open_expired(ctx, state);
1716                 switch (err) {
1717                 default:
1718                         goto out;
1719                 case -NFS4ERR_GRACE:
1720                 case -NFS4ERR_DELAY:
1721                         nfs4_handle_exception(server, err, &exception);
1722                         err = 0;
1723                 }
1724         } while (exception.retry);
1725 out:
1726         return err;
1727 }
1728
1729 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1730 {
1731         struct nfs_open_context *ctx;
1732         int ret;
1733
1734         ctx = nfs4_state_find_open_context(state);
1735         if (IS_ERR(ctx))
1736                 return PTR_ERR(ctx);
1737         ret = nfs4_do_open_expired(ctx, state);
1738         put_nfs_open_context(ctx);
1739         return ret;
1740 }
1741
1742 #if defined(CONFIG_NFS_V4_1)
1743 static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1744 {
1745         int status = NFS_OK;
1746         struct nfs_server *server = NFS_SERVER(state->inode);
1747
1748         if (state->flags & flags) {
1749                 status = nfs41_test_stateid(server, stateid);
1750                 if (status != NFS_OK) {
1751                         nfs41_free_stateid(server, stateid);
1752                         state->flags &= ~flags;
1753                 }
1754         }
1755         return status;
1756 }
1757
1758 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1759 {
1760         int deleg_status, open_status;
1761         int deleg_flags = 1 << NFS_DELEGATED_STATE;
1762         int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1763
1764         deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1765         open_status = nfs41_check_expired_stateid(state,  &state->open_stateid, open_flags);
1766
1767         if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1768                 return NFS_OK;
1769         return nfs4_open_expired(sp, state);
1770 }
1771 #endif
1772
1773 /*
1774  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1775  * fields corresponding to attributes that were used to store the verifier.
1776  * Make sure we clobber those fields in the later setattr call
1777  */
1778 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1779 {
1780         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1781             !(sattr->ia_valid & ATTR_ATIME_SET))
1782                 sattr->ia_valid |= ATTR_ATIME;
1783
1784         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1785             !(sattr->ia_valid & ATTR_MTIME_SET))
1786                 sattr->ia_valid |= ATTR_MTIME;
1787 }
1788
1789 /*
1790  * Returns a referenced nfs4_state
1791  */
1792 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1793 {
1794         struct nfs4_state_owner  *sp;
1795         struct nfs4_state     *state = NULL;
1796         struct nfs_server       *server = NFS_SERVER(dir);
1797         struct nfs4_opendata *opendata;
1798         int status;
1799
1800         /* Protect against reboot recovery conflicts */
1801         status = -ENOMEM;
1802         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1803         if (sp == NULL) {
1804                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1805                 goto out_err;
1806         }
1807         status = nfs4_recover_expired_lease(server);
1808         if (status != 0)
1809                 goto err_put_state_owner;
1810         if (dentry->d_inode != NULL)
1811                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1812         status = -ENOMEM;
1813         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1814         if (opendata == NULL)
1815                 goto err_put_state_owner;
1816
1817         if (dentry->d_inode != NULL)
1818                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1819
1820         status = _nfs4_proc_open(opendata);
1821         if (status != 0)
1822                 goto err_opendata_put;
1823
1824         state = nfs4_opendata_to_nfs4_state(opendata);
1825         status = PTR_ERR(state);
1826         if (IS_ERR(state))
1827                 goto err_opendata_put;
1828         if (server->caps & NFS_CAP_POSIX_LOCK)
1829                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1830
1831         if (opendata->o_arg.open_flags & O_EXCL) {
1832                 nfs4_exclusive_attrset(opendata, sattr);
1833
1834                 nfs_fattr_init(opendata->o_res.f_attr);
1835                 status = nfs4_do_setattr(state->inode, cred,
1836                                 opendata->o_res.f_attr, sattr,
1837                                 state);
1838                 if (status == 0)
1839                         nfs_setattr_update_inode(state->inode, sattr);
1840                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1841         }
1842         nfs4_opendata_put(opendata);
1843         nfs4_put_state_owner(sp);
1844         *res = state;
1845         return 0;
1846 err_opendata_put:
1847         nfs4_opendata_put(opendata);
1848 err_put_state_owner:
1849         nfs4_put_state_owner(sp);
1850 out_err:
1851         *res = NULL;
1852         return status;
1853 }
1854
1855
1856 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1857 {
1858         struct nfs4_exception exception = { };
1859         struct nfs4_state *res;
1860         int status;
1861
1862         do {
1863                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1864                 if (status == 0)
1865                         break;
1866                 /* NOTE: BAD_SEQID means the server and client disagree about the
1867                  * book-keeping w.r.t. state-changing operations
1868                  * (OPEN/CLOSE/LOCK/LOCKU...)
1869                  * It is actually a sign of a bug on the client or on the server.
1870                  *
1871                  * If we receive a BAD_SEQID error in the particular case of
1872                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1873                  * have unhashed the old state_owner for us, and that we can
1874                  * therefore safely retry using a new one. We should still warn
1875                  * the user though...
1876                  */
1877                 if (status == -NFS4ERR_BAD_SEQID) {
1878                         pr_warn_ratelimited("NFS: v4 server %s "
1879                                         " returned a bad sequence-id error!\n",
1880                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1881                         exception.retry = 1;
1882                         continue;
1883                 }
1884                 /*
1885                  * BAD_STATEID on OPEN means that the server cancelled our
1886                  * state before it received the OPEN_CONFIRM.
1887                  * Recover by retrying the request as per the discussion
1888                  * on Page 181 of RFC3530.
1889                  */
1890                 if (status == -NFS4ERR_BAD_STATEID) {
1891                         exception.retry = 1;
1892                         continue;
1893                 }
1894                 if (status == -EAGAIN) {
1895                         /* We must have found a delegation */
1896                         exception.retry = 1;
1897                         continue;
1898                 }
1899                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1900                                         status, &exception));
1901         } while (exception.retry);
1902         return res;
1903 }
1904
1905 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1906                             struct nfs_fattr *fattr, struct iattr *sattr,
1907                             struct nfs4_state *state)
1908 {
1909         struct nfs_server *server = NFS_SERVER(inode);
1910         struct nfs_setattrargs  arg = {
1911                 .fh             = NFS_FH(inode),
1912                 .iap            = sattr,
1913                 .server         = server,
1914                 .bitmask = server->attr_bitmask,
1915         };
1916         struct nfs_setattrres  res = {
1917                 .fattr          = fattr,
1918                 .server         = server,
1919         };
1920         struct rpc_message msg = {
1921                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1922                 .rpc_argp       = &arg,
1923                 .rpc_resp       = &res,
1924                 .rpc_cred       = cred,
1925         };
1926         unsigned long timestamp = jiffies;
1927         int status;
1928
1929         nfs_fattr_init(fattr);
1930
1931         if (state != NULL) {
1932                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1933                                 current->files, current->tgid);
1934         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1935                                 FMODE_WRITE)) {
1936                 /* Use that stateid */
1937         } else
1938                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1939
1940         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1941         if (status == 0 && state != NULL)
1942                 renew_lease(server, timestamp);
1943         return status;
1944 }
1945
1946 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1947                            struct nfs_fattr *fattr, struct iattr *sattr,
1948                            struct nfs4_state *state)
1949 {
1950         struct nfs_server *server = NFS_SERVER(inode);
1951         struct nfs4_exception exception = {
1952                 .state = state,
1953                 .inode = inode,
1954         };
1955         int err;
1956         do {
1957                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1958                 switch (err) {
1959                 case -NFS4ERR_OPENMODE:
1960                         if (state && !(state->state & FMODE_WRITE)) {
1961                                 err = -EBADF;
1962                                 if (sattr->ia_valid & ATTR_OPEN)
1963                                         err = -EACCES;
1964                                 goto out;
1965                         }
1966                 }
1967                 err = nfs4_handle_exception(server, err, &exception);
1968         } while (exception.retry);
1969 out:
1970         return err;
1971 }
1972
1973 struct nfs4_closedata {
1974         struct inode *inode;
1975         struct nfs4_state *state;
1976         struct nfs_closeargs arg;
1977         struct nfs_closeres res;
1978         struct nfs_fattr fattr;
1979         unsigned long timestamp;
1980         bool roc;
1981         u32 roc_barrier;
1982 };
1983
1984 static void nfs4_free_closedata(void *data)
1985 {
1986         struct nfs4_closedata *calldata = data;
1987         struct nfs4_state_owner *sp = calldata->state->owner;
1988         struct super_block *sb = calldata->state->inode->i_sb;
1989
1990         if (calldata->roc)
1991                 pnfs_roc_release(calldata->state->inode);
1992         nfs4_put_open_state(calldata->state);
1993         nfs_free_seqid(calldata->arg.seqid);
1994         nfs4_put_state_owner(sp);
1995         nfs_sb_deactive(sb);
1996         kfree(calldata);
1997 }
1998
1999 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2000                 fmode_t fmode)
2001 {
2002         spin_lock(&state->owner->so_lock);
2003         if (!(fmode & FMODE_READ))
2004                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2005         if (!(fmode & FMODE_WRITE))
2006                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2007         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2008         spin_unlock(&state->owner->so_lock);
2009 }
2010
2011 static void nfs4_close_done(struct rpc_task *task, void *data)
2012 {
2013         struct nfs4_closedata *calldata = data;
2014         struct nfs4_state *state = calldata->state;
2015         struct nfs_server *server = NFS_SERVER(calldata->inode);
2016
2017         dprintk("%s: begin!\n", __func__);
2018         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2019                 return;
2020         /* hmm. we are done with the inode, and in the process of freeing
2021          * the state_owner. we keep this around to process errors
2022          */
2023         switch (task->tk_status) {
2024                 case 0:
2025                         if (calldata->roc)
2026                                 pnfs_roc_set_barrier(state->inode,
2027                                                      calldata->roc_barrier);
2028                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2029                         renew_lease(server, calldata->timestamp);
2030                         nfs4_close_clear_stateid_flags(state,
2031                                         calldata->arg.fmode);
2032                         break;
2033                 case -NFS4ERR_STALE_STATEID:
2034                 case -NFS4ERR_OLD_STATEID:
2035                 case -NFS4ERR_BAD_STATEID:
2036                 case -NFS4ERR_EXPIRED:
2037                         if (calldata->arg.fmode == 0)
2038                                 break;
2039                 default:
2040                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2041                                 rpc_restart_call_prepare(task);
2042         }
2043         nfs_release_seqid(calldata->arg.seqid);
2044         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2045         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2046 }
2047
2048 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2049 {
2050         struct nfs4_closedata *calldata = data;
2051         struct nfs4_state *state = calldata->state;
2052         int call_close = 0;
2053
2054         dprintk("%s: begin!\n", __func__);
2055         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2056                 return;
2057
2058         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2059         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2060         spin_lock(&state->owner->so_lock);
2061         /* Calculate the change in open mode */
2062         if (state->n_rdwr == 0) {
2063                 if (state->n_rdonly == 0) {
2064                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2065                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2066                         calldata->arg.fmode &= ~FMODE_READ;
2067                 }
2068                 if (state->n_wronly == 0) {
2069                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2070                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2071                         calldata->arg.fmode &= ~FMODE_WRITE;
2072                 }
2073         }
2074         spin_unlock(&state->owner->so_lock);
2075
2076         if (!call_close) {
2077                 /* Note: exit _without_ calling nfs4_close_done */
2078                 task->tk_action = NULL;
2079                 goto out;
2080         }
2081
2082         if (calldata->arg.fmode == 0) {
2083                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2084                 if (calldata->roc &&
2085                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2086                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2087                                      task, NULL);
2088                         goto out;
2089                 }
2090         }
2091
2092         nfs_fattr_init(calldata->res.fattr);
2093         calldata->timestamp = jiffies;
2094         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2095                                 &calldata->arg.seq_args,
2096                                 &calldata->res.seq_res,
2097                                 task))
2098                 goto out;
2099         rpc_call_start(task);
2100 out:
2101         dprintk("%s: done!\n", __func__);
2102 }
2103
2104 static const struct rpc_call_ops nfs4_close_ops = {
2105         .rpc_call_prepare = nfs4_close_prepare,
2106         .rpc_call_done = nfs4_close_done,
2107         .rpc_release = nfs4_free_closedata,
2108 };
2109
2110 /*
2111  * It is possible for data to be read/written from a mem-mapped file
2112  * after the sys_close call (which hits the vfs layer as a flush).
2113  * This means that we can't safely call nfsv4 close on a file until
2114  * the inode is cleared. This in turn means that we are not good
2115  * NFSv4 citizens - we do not indicate to the server to update the file's
2116  * share state even when we are done with one of the three share
2117  * stateid's in the inode.
2118  *
2119  * NOTE: Caller must be holding the sp->so_owner semaphore!
2120  */
2121 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2122 {
2123         struct nfs_server *server = NFS_SERVER(state->inode);
2124         struct nfs4_closedata *calldata;
2125         struct nfs4_state_owner *sp = state->owner;
2126         struct rpc_task *task;
2127         struct rpc_message msg = {
2128                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2129                 .rpc_cred = state->owner->so_cred,
2130         };
2131         struct rpc_task_setup task_setup_data = {
2132                 .rpc_client = server->client,
2133                 .rpc_message = &msg,
2134                 .callback_ops = &nfs4_close_ops,
2135                 .workqueue = nfsiod_workqueue,
2136                 .flags = RPC_TASK_ASYNC,
2137         };
2138         int status = -ENOMEM;
2139
2140         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2141         if (calldata == NULL)
2142                 goto out;
2143         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2144         calldata->inode = state->inode;
2145         calldata->state = state;
2146         calldata->arg.fh = NFS_FH(state->inode);
2147         calldata->arg.stateid = &state->open_stateid;
2148         /* Serialization for the sequence id */
2149         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2150         if (calldata->arg.seqid == NULL)
2151                 goto out_free_calldata;
2152         calldata->arg.fmode = 0;
2153         calldata->arg.bitmask = server->cache_consistency_bitmask;
2154         calldata->res.fattr = &calldata->fattr;
2155         calldata->res.seqid = calldata->arg.seqid;
2156         calldata->res.server = server;
2157         calldata->roc = roc;
2158         nfs_sb_active(calldata->inode->i_sb);
2159
2160         msg.rpc_argp = &calldata->arg;
2161         msg.rpc_resp = &calldata->res;
2162         task_setup_data.callback_data = calldata;
2163         task = rpc_run_task(&task_setup_data);
2164         if (IS_ERR(task))
2165                 return PTR_ERR(task);
2166         status = 0;
2167         if (wait)
2168                 status = rpc_wait_for_completion_task(task);
2169         rpc_put_task(task);
2170         return status;
2171 out_free_calldata:
2172         kfree(calldata);
2173 out:
2174         if (roc)
2175                 pnfs_roc_release(state->inode);
2176         nfs4_put_open_state(state);
2177         nfs4_put_state_owner(sp);
2178         return status;
2179 }
2180
2181 static struct inode *
2182 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2183 {
2184         struct nfs4_state *state;
2185
2186         /* Protect against concurrent sillydeletes */
2187         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2188         if (IS_ERR(state))
2189                 return ERR_CAST(state);
2190         ctx->state = state;
2191         return igrab(state->inode);
2192 }
2193
2194 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2195 {
2196         if (ctx->state == NULL)
2197                 return;
2198         if (is_sync)
2199                 nfs4_close_sync(ctx->state, ctx->mode);
2200         else
2201                 nfs4_close_state(ctx->state, ctx->mode);
2202 }
2203
2204 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2205 {
2206         struct nfs4_server_caps_arg args = {
2207                 .fhandle = fhandle,
2208         };
2209         struct nfs4_server_caps_res res = {};
2210         struct rpc_message msg = {
2211                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2212                 .rpc_argp = &args,
2213                 .rpc_resp = &res,
2214         };
2215         int status;
2216
2217         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2218         if (status == 0) {
2219                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2220                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2221                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2222                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2223                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2224                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2225                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2226                         server->caps |= NFS_CAP_ACLS;
2227                 if (res.has_links != 0)
2228                         server->caps |= NFS_CAP_HARDLINKS;
2229                 if (res.has_symlinks != 0)
2230                         server->caps |= NFS_CAP_SYMLINKS;
2231                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2232                         server->caps |= NFS_CAP_FILEID;
2233                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2234                         server->caps |= NFS_CAP_MODE;
2235                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2236                         server->caps |= NFS_CAP_NLINK;
2237                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2238                         server->caps |= NFS_CAP_OWNER;
2239                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2240                         server->caps |= NFS_CAP_OWNER_GROUP;
2241                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2242                         server->caps |= NFS_CAP_ATIME;
2243                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2244                         server->caps |= NFS_CAP_CTIME;
2245                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2246                         server->caps |= NFS_CAP_MTIME;
2247
2248                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2249                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2250                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2251                 server->acl_bitmask = res.acl_bitmask;
2252                 server->fh_expire_type = res.fh_expire_type;
2253         }
2254
2255         return status;
2256 }
2257
2258 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2259 {
2260         struct nfs4_exception exception = { };
2261         int err;
2262         do {
2263                 err = nfs4_handle_exception(server,
2264                                 _nfs4_server_capabilities(server, fhandle),
2265                                 &exception);
2266         } while (exception.retry);
2267         return err;
2268 }
2269
2270 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2271                 struct nfs_fsinfo *info)
2272 {
2273         struct nfs4_lookup_root_arg args = {
2274                 .bitmask = nfs4_fattr_bitmap,
2275         };
2276         struct nfs4_lookup_res res = {
2277                 .server = server,
2278                 .fattr = info->fattr,
2279                 .fh = fhandle,
2280         };
2281         struct rpc_message msg = {
2282                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2283                 .rpc_argp = &args,
2284                 .rpc_resp = &res,
2285         };
2286
2287         nfs_fattr_init(info->fattr);
2288         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2289 }
2290
2291 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2292                 struct nfs_fsinfo *info)
2293 {
2294         struct nfs4_exception exception = { };
2295         int err;
2296         do {
2297                 err = _nfs4_lookup_root(server, fhandle, info);
2298                 switch (err) {
2299                 case 0:
2300                 case -NFS4ERR_WRONGSEC:
2301                         goto out;
2302                 default:
2303                         err = nfs4_handle_exception(server, err, &exception);
2304                 }
2305         } while (exception.retry);
2306 out:
2307         return err;
2308 }
2309
2310 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2311                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2312 {
2313         struct rpc_auth *auth;
2314         int ret;
2315
2316         auth = rpcauth_create(flavor, server->client);
2317         if (!auth) {
2318                 ret = -EIO;
2319                 goto out;
2320         }
2321         ret = nfs4_lookup_root(server, fhandle, info);
2322 out:
2323         return ret;
2324 }
2325
2326 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2327                               struct nfs_fsinfo *info)
2328 {
2329         int i, len, status = 0;
2330         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2331
2332         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2333         flav_array[len] = RPC_AUTH_NULL;
2334         len += 1;
2335
2336         for (i = 0; i < len; i++) {
2337                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2338                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2339                         continue;
2340                 break;
2341         }
2342         /*
2343          * -EACCESS could mean that the user doesn't have correct permissions
2344          * to access the mount.  It could also mean that we tried to mount
2345          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2346          * existing mount programs don't handle -EACCES very well so it should
2347          * be mapped to -EPERM instead.
2348          */
2349         if (status == -EACCES)
2350                 status = -EPERM;
2351         return status;
2352 }
2353
2354 /*
2355  * get the file handle for the "/" directory on the server
2356  */
2357 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2358                               struct nfs_fsinfo *info)
2359 {
2360         int minor_version = server->nfs_client->cl_minorversion;
2361         int status = nfs4_lookup_root(server, fhandle, info);
2362         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2363                 /*
2364                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2365                  * by nfs4_map_errors() as this function exits.
2366                  */
2367                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2368         if (status == 0)
2369                 status = nfs4_server_capabilities(server, fhandle);
2370         if (status == 0)
2371                 status = nfs4_do_fsinfo(server, fhandle, info);
2372         return nfs4_map_errors(status);
2373 }
2374
2375 /*
2376  * Get locations and (maybe) other attributes of a referral.
2377  * Note that we'll actually follow the referral later when
2378  * we detect fsid mismatch in inode revalidation
2379  */
2380 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2381                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2382 {
2383         int status = -ENOMEM;
2384         struct page *page = NULL;
2385         struct nfs4_fs_locations *locations = NULL;
2386
2387         page = alloc_page(GFP_KERNEL);
2388         if (page == NULL)
2389                 goto out;
2390         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2391         if (locations == NULL)
2392                 goto out;
2393
2394         status = nfs4_proc_fs_locations(dir, name, locations, page);
2395         if (status != 0)
2396                 goto out;
2397         /* Make sure server returned a different fsid for the referral */
2398         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2399                 dprintk("%s: server did not return a different fsid for"
2400                         " a referral at %s\n", __func__, name->name);
2401                 status = -EIO;
2402                 goto out;
2403         }
2404         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2405         nfs_fixup_referral_attributes(&locations->fattr);
2406
2407         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2408         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2409         memset(fhandle, 0, sizeof(struct nfs_fh));
2410 out:
2411         if (page)
2412                 __free_page(page);
2413         kfree(locations);
2414         return status;
2415 }
2416
2417 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2418 {
2419         struct nfs4_getattr_arg args = {
2420                 .fh = fhandle,
2421                 .bitmask = server->attr_bitmask,
2422         };
2423         struct nfs4_getattr_res res = {
2424                 .fattr = fattr,
2425                 .server = server,
2426         };
2427         struct rpc_message msg = {
2428                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2429                 .rpc_argp = &args,
2430                 .rpc_resp = &res,
2431         };
2432
2433         nfs_fattr_init(fattr);
2434         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2435 }
2436
2437 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2438 {
2439         struct nfs4_exception exception = { };
2440         int err;
2441         do {
2442                 err = nfs4_handle_exception(server,
2443                                 _nfs4_proc_getattr(server, fhandle, fattr),
2444                                 &exception);
2445         } while (exception.retry);
2446         return err;
2447 }
2448
2449 /*
2450  * The file is not closed if it is opened due to the a request to change
2451  * the size of the file. The open call will not be needed once the
2452  * VFS layer lookup-intents are implemented.
2453  *
2454  * Close is called when the inode is destroyed.
2455  * If we haven't opened the file for O_WRONLY, we
2456  * need to in the size_change case to obtain a stateid.
2457  *
2458  * Got race?
2459  * Because OPEN is always done by name in nfsv4, it is
2460  * possible that we opened a different file by the same
2461  * name.  We can recognize this race condition, but we
2462  * can't do anything about it besides returning an error.
2463  *
2464  * This will be fixed with VFS changes (lookup-intent).
2465  */
2466 static int
2467 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2468                   struct iattr *sattr)
2469 {
2470         struct inode *inode = dentry->d_inode;
2471         struct rpc_cred *cred = NULL;
2472         struct nfs4_state *state = NULL;
2473         int status;
2474
2475         if (pnfs_ld_layoutret_on_setattr(inode))
2476                 pnfs_return_layout(inode);
2477
2478         nfs_fattr_init(fattr);
2479
2480         /* Search for an existing open(O_WRITE) file */
2481         if (sattr->ia_valid & ATTR_FILE) {
2482                 struct nfs_open_context *ctx;
2483
2484                 ctx = nfs_file_open_context(sattr->ia_file);
2485                 if (ctx) {
2486                         cred = ctx->cred;
2487                         state = ctx->state;
2488                 }
2489         }
2490
2491         /* Deal with open(O_TRUNC) */
2492         if (sattr->ia_valid & ATTR_OPEN)
2493                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2494
2495         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2496         if (status == 0)
2497                 nfs_setattr_update_inode(inode, sattr);
2498         return status;
2499 }
2500
2501 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2502                 const struct qstr *name, struct nfs_fh *fhandle,
2503                 struct nfs_fattr *fattr)
2504 {
2505         struct nfs_server *server = NFS_SERVER(dir);
2506         int                    status;
2507         struct nfs4_lookup_arg args = {
2508                 .bitmask = server->attr_bitmask,
2509                 .dir_fh = NFS_FH(dir),
2510                 .name = name,
2511         };
2512         struct nfs4_lookup_res res = {
2513                 .server = server,
2514                 .fattr = fattr,
2515                 .fh = fhandle,
2516         };
2517         struct rpc_message msg = {
2518                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2519                 .rpc_argp = &args,
2520                 .rpc_resp = &res,
2521         };
2522
2523         nfs_fattr_init(fattr);
2524
2525         dprintk("NFS call  lookup %s\n", name->name);
2526         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2527         dprintk("NFS reply lookup: %d\n", status);
2528         return status;
2529 }
2530
2531 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2532 {
2533         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2534                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2535         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2536         fattr->nlink = 2;
2537 }
2538
2539 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2540                                    struct qstr *name, struct nfs_fh *fhandle,
2541                                    struct nfs_fattr *fattr)
2542 {
2543         struct nfs4_exception exception = { };
2544         struct rpc_clnt *client = *clnt;
2545         int err;
2546         do {
2547                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2548                 switch (err) {
2549                 case -NFS4ERR_BADNAME:
2550                         err = -ENOENT;
2551                         goto out;
2552                 case -NFS4ERR_MOVED:
2553                         err = nfs4_get_referral(dir, name, fattr, fhandle);
2554                         goto out;
2555                 case -NFS4ERR_WRONGSEC:
2556                         err = -EPERM;
2557                         if (client != *clnt)
2558                                 goto out;
2559
2560                         client = nfs4_create_sec_client(client, dir, name);
2561                         if (IS_ERR(client))
2562                                 return PTR_ERR(client);
2563
2564                         exception.retry = 1;
2565                         break;
2566                 default:
2567                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2568                 }
2569         } while (exception.retry);
2570
2571 out:
2572         if (err == 0)
2573                 *clnt = client;
2574         else if (client != *clnt)
2575                 rpc_shutdown_client(client);
2576
2577         return err;
2578 }
2579
2580 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2581                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2582 {
2583         int status;
2584         struct rpc_clnt *client = NFS_CLIENT(dir);
2585
2586         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2587         if (client != NFS_CLIENT(dir)) {
2588                 rpc_shutdown_client(client);
2589                 nfs_fixup_secinfo_attributes(fattr);
2590         }
2591         return status;
2592 }
2593
2594 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2595 {
2596         struct nfs_server *server = NFS_SERVER(inode);
2597         struct nfs4_accessargs args = {
2598                 .fh = NFS_FH(inode),
2599                 .bitmask = server->cache_consistency_bitmask,
2600         };
2601         struct nfs4_accessres res = {
2602                 .server = server,
2603         };
2604         struct rpc_message msg = {
2605                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2606                 .rpc_argp = &args,
2607                 .rpc_resp = &res,
2608                 .rpc_cred = entry->cred,
2609         };
2610         int mode = entry->mask;
2611         int status;
2612
2613         /*
2614          * Determine which access bits we want to ask for...
2615          */
2616         if (mode & MAY_READ)
2617                 args.access |= NFS4_ACCESS_READ;
2618         if (S_ISDIR(inode->i_mode)) {
2619                 if (mode & MAY_WRITE)
2620                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2621                 if (mode & MAY_EXEC)
2622                         args.access |= NFS4_ACCESS_LOOKUP;
2623         } else {
2624                 if (mode & MAY_WRITE)
2625                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2626                 if (mode & MAY_EXEC)
2627                         args.access |= NFS4_ACCESS_EXECUTE;
2628         }
2629
2630         res.fattr = nfs_alloc_fattr();
2631         if (res.fattr == NULL)
2632                 return -ENOMEM;
2633
2634         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2635         if (!status) {
2636                 entry->mask = 0;
2637                 if (res.access & NFS4_ACCESS_READ)
2638                         entry->mask |= MAY_READ;
2639                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2640                         entry->mask |= MAY_WRITE;
2641                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2642                         entry->mask |= MAY_EXEC;
2643                 nfs_refresh_inode(inode, res.fattr);
2644         }
2645         nfs_free_fattr(res.fattr);
2646         return status;
2647 }
2648
2649 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2650 {
2651         struct nfs4_exception exception = { };
2652         int err;
2653         do {
2654                 err = nfs4_handle_exception(NFS_SERVER(inode),
2655                                 _nfs4_proc_access(inode, entry),
2656                                 &exception);
2657         } while (exception.retry);
2658         return err;
2659 }
2660
2661 /*
2662  * TODO: For the time being, we don't try to get any attributes
2663  * along with any of the zero-copy operations READ, READDIR,
2664  * READLINK, WRITE.
2665  *
2666  * In the case of the first three, we want to put the GETATTR
2667  * after the read-type operation -- this is because it is hard
2668  * to predict the length of a GETATTR response in v4, and thus
2669  * align the READ data correctly.  This means that the GETATTR
2670  * may end up partially falling into the page cache, and we should
2671  * shift it into the 'tail' of the xdr_buf before processing.
2672  * To do this efficiently, we need to know the total length
2673  * of data received, which doesn't seem to be available outside
2674  * of the RPC layer.
2675  *
2676  * In the case of WRITE, we also want to put the GETATTR after
2677  * the operation -- in this case because we want to make sure
2678  * we get the post-operation mtime and size.  This means that
2679  * we can't use xdr_encode_pages() as written: we need a variant
2680  * of it which would leave room in the 'tail' iovec.
2681  *
2682  * Both of these changes to the XDR layer would in fact be quite
2683  * minor, but I decided to leave them for a subsequent patch.
2684  */
2685 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2686                 unsigned int pgbase, unsigned int pglen)
2687 {
2688         struct nfs4_readlink args = {
2689                 .fh       = NFS_FH(inode),
2690                 .pgbase   = pgbase,
2691                 .pglen    = pglen,
2692                 .pages    = &page,
2693         };
2694         struct nfs4_readlink_res res;
2695         struct rpc_message msg = {
2696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2697                 .rpc_argp = &args,
2698                 .rpc_resp = &res,
2699         };
2700
2701         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2702 }
2703
2704 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2705                 unsigned int pgbase, unsigned int pglen)
2706 {
2707         struct nfs4_exception exception = { };
2708         int err;
2709         do {
2710                 err = nfs4_handle_exception(NFS_SERVER(inode),
2711                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2712                                 &exception);
2713         } while (exception.retry);
2714         return err;
2715 }
2716
2717 /*
2718  * Got race?
2719  * We will need to arrange for the VFS layer to provide an atomic open.
2720  * Until then, this create/open method is prone to inefficiency and race
2721  * conditions due to the lookup, create, and open VFS calls from sys_open()
2722  * placed on the wire.
2723  *
2724  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2725  * The file will be opened again in the subsequent VFS open call
2726  * (nfs4_proc_file_open).
2727  *
2728  * The open for read will just hang around to be used by any process that
2729  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2730  */
2731
2732 static int
2733 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2734                  int flags, struct nfs_open_context *ctx)
2735 {
2736         struct dentry *de = dentry;
2737         struct nfs4_state *state;
2738         struct rpc_cred *cred = NULL;
2739         fmode_t fmode = 0;
2740         int status = 0;
2741
2742         if (ctx != NULL) {
2743                 cred = ctx->cred;
2744                 de = ctx->dentry;
2745                 fmode = ctx->mode;
2746         }
2747         sattr->ia_mode &= ~current_umask();
2748         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2749         d_drop(dentry);
2750         if (IS_ERR(state)) {
2751                 status = PTR_ERR(state);
2752                 goto out;
2753         }
2754         d_add(dentry, igrab(state->inode));
2755         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2756         if (ctx != NULL)
2757                 ctx->state = state;
2758         else
2759                 nfs4_close_sync(state, fmode);
2760 out:
2761         return status;
2762 }
2763
2764 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2765 {
2766         struct nfs_server *server = NFS_SERVER(dir);
2767         struct nfs_removeargs args = {
2768                 .fh = NFS_FH(dir),
2769                 .name.len = name->len,
2770                 .name.name = name->name,
2771                 .bitmask = server->attr_bitmask,
2772         };
2773         struct nfs_removeres res = {
2774                 .server = server,
2775         };
2776         struct rpc_message msg = {
2777                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2778                 .rpc_argp = &args,
2779                 .rpc_resp = &res,
2780         };
2781         int status = -ENOMEM;
2782
2783         res.dir_attr = nfs_alloc_fattr();
2784         if (res.dir_attr == NULL)
2785                 goto out;
2786
2787         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2788         if (status == 0) {
2789                 update_changeattr(dir, &res.cinfo);
2790                 nfs_post_op_update_inode(dir, res.dir_attr);
2791         }
2792         nfs_free_fattr(res.dir_attr);
2793 out:
2794         return status;
2795 }
2796
2797 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2798 {
2799         struct nfs4_exception exception = { };
2800         int err;
2801         do {
2802                 err = nfs4_handle_exception(NFS_SERVER(dir),
2803                                 _nfs4_proc_remove(dir, name),
2804                                 &exception);
2805         } while (exception.retry);
2806         return err;
2807 }
2808
2809 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2810 {
2811         struct nfs_server *server = NFS_SERVER(dir);
2812         struct nfs_removeargs *args = msg->rpc_argp;
2813         struct nfs_removeres *res = msg->rpc_resp;
2814
2815         args->bitmask = server->cache_consistency_bitmask;
2816         res->server = server;
2817         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2818         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2819 }
2820
2821 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2822 {
2823         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2824                                 &data->args.seq_args,
2825                                 &data->res.seq_res,
2826                                 task))
2827                 return;
2828         rpc_call_start(task);
2829 }
2830
2831 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2832 {
2833         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2834
2835         if (!nfs4_sequence_done(task, &res->seq_res))
2836                 return 0;
2837         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2838                 return 0;
2839         update_changeattr(dir, &res->cinfo);
2840         nfs_post_op_update_inode(dir, res->dir_attr);
2841         return 1;
2842 }
2843
2844 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2845 {
2846         struct nfs_server *server = NFS_SERVER(dir);
2847         struct nfs_renameargs *arg = msg->rpc_argp;
2848         struct nfs_renameres *res = msg->rpc_resp;
2849
2850         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2851         arg->bitmask = server->attr_bitmask;
2852         res->server = server;
2853         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2854 }
2855
2856 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2857 {
2858         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2859                                 &data->args.seq_args,
2860                                 &data->res.seq_res,
2861                                 task))
2862                 return;
2863         rpc_call_start(task);
2864 }
2865
2866 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2867                                  struct inode *new_dir)
2868 {
2869         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2870
2871         if (!nfs4_sequence_done(task, &res->seq_res))
2872                 return 0;
2873         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2874                 return 0;
2875
2876         update_changeattr(old_dir, &res->old_cinfo);
2877         nfs_post_op_update_inode(old_dir, res->old_fattr);
2878         update_changeattr(new_dir, &res->new_cinfo);
2879         nfs_post_op_update_inode(new_dir, res->new_fattr);
2880         return 1;
2881 }
2882
2883 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2884                 struct inode *new_dir, struct qstr *new_name)
2885 {
2886         struct nfs_server *server = NFS_SERVER(old_dir);
2887         struct nfs_renameargs arg = {
2888                 .old_dir = NFS_FH(old_dir),
2889                 .new_dir = NFS_FH(new_dir),
2890                 .old_name = old_name,
2891                 .new_name = new_name,
2892                 .bitmask = server->attr_bitmask,
2893         };
2894         struct nfs_renameres res = {
2895                 .server = server,
2896         };
2897         struct rpc_message msg = {
2898                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2899                 .rpc_argp = &arg,
2900                 .rpc_resp = &res,
2901         };
2902         int status = -ENOMEM;
2903
2904         res.old_fattr = nfs_alloc_fattr();
2905         res.new_fattr = nfs_alloc_fattr();
2906         if (res.old_fattr == NULL || res.new_fattr == NULL)
2907                 goto out;
2908
2909         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2910         if (!status) {
2911                 update_changeattr(old_dir, &res.old_cinfo);
2912                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2913                 update_changeattr(new_dir, &res.new_cinfo);
2914                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2915         }
2916 out:
2917         nfs_free_fattr(res.new_fattr);
2918         nfs_free_fattr(res.old_fattr);
2919         return status;
2920 }
2921
2922 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2923                 struct inode *new_dir, struct qstr *new_name)
2924 {
2925         struct nfs4_exception exception = { };
2926         int err;
2927         do {
2928                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2929                                 _nfs4_proc_rename(old_dir, old_name,
2930                                         new_dir, new_name),
2931                                 &exception);
2932         } while (exception.retry);
2933         return err;
2934 }
2935
2936 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2937 {
2938         struct nfs_server *server = NFS_SERVER(inode);
2939         struct nfs4_link_arg arg = {
2940                 .fh     = NFS_FH(inode),
2941                 .dir_fh = NFS_FH(dir),
2942                 .name   = name,
2943                 .bitmask = server->attr_bitmask,
2944         };
2945         struct nfs4_link_res res = {
2946                 .server = server,
2947         };
2948         struct rpc_message msg = {
2949                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2950                 .rpc_argp = &arg,
2951                 .rpc_resp = &res,
2952         };
2953         int status = -ENOMEM;
2954
2955         res.fattr = nfs_alloc_fattr();
2956         res.dir_attr = nfs_alloc_fattr();
2957         if (res.fattr == NULL || res.dir_attr == NULL)
2958                 goto out;
2959
2960         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2961         if (!status) {
2962                 update_changeattr(dir, &res.cinfo);
2963                 nfs_post_op_update_inode(dir, res.dir_attr);
2964                 nfs_post_op_update_inode(inode, res.fattr);
2965         }
2966 out:
2967         nfs_free_fattr(res.dir_attr);
2968         nfs_free_fattr(res.fattr);
2969         return status;
2970 }
2971
2972 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2973 {
2974         struct nfs4_exception exception = { };
2975         int err;
2976         do {
2977                 err = nfs4_handle_exception(NFS_SERVER(inode),
2978                                 _nfs4_proc_link(inode, dir, name),
2979                                 &exception);
2980         } while (exception.retry);
2981         return err;
2982 }
2983
2984 struct nfs4_createdata {
2985         struct rpc_message msg;
2986         struct nfs4_create_arg arg;
2987         struct nfs4_create_res res;
2988         struct nfs_fh fh;
2989         struct nfs_fattr fattr;
2990         struct nfs_fattr dir_fattr;
2991 };
2992
2993 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2994                 struct qstr *name, struct iattr *sattr, u32 ftype)
2995 {
2996         struct nfs4_createdata *data;
2997
2998         data = kzalloc(sizeof(*data), GFP_KERNEL);
2999         if (data != NULL) {
3000                 struct nfs_server *server = NFS_SERVER(dir);
3001
3002                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3003                 data->msg.rpc_argp = &data->arg;
3004                 data->msg.rpc_resp = &data->res;
3005                 data->arg.dir_fh = NFS_FH(dir);
3006                 data->arg.server = server;
3007                 data->arg.name = name;
3008                 data->arg.attrs = sattr;
3009                 data->arg.ftype = ftype;
3010                 data->arg.bitmask = server->attr_bitmask;
3011                 data->res.server = server;
3012                 data->res.fh = &data->fh;
3013                 data->res.fattr = &data->fattr;
3014                 data->res.dir_fattr = &data->dir_fattr;
3015                 nfs_fattr_init(data->res.fattr);
3016                 nfs_fattr_init(data->res.dir_fattr);
3017         }
3018         return data;
3019 }
3020
3021 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3022 {
3023         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3024                                     &data->arg.seq_args, &data->res.seq_res, 1);
3025         if (status == 0) {
3026                 update_changeattr(dir, &data->res.dir_cinfo);
3027                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
3028                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3029         }
3030         return status;
3031 }
3032
3033 static void nfs4_free_createdata(struct nfs4_createdata *data)
3034 {
3035         kfree(data);
3036 }
3037
3038 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3039                 struct page *page, unsigned int len, struct iattr *sattr)
3040 {
3041         struct nfs4_createdata *data;
3042         int status = -ENAMETOOLONG;
3043
3044         if (len > NFS4_MAXPATHLEN)
3045                 goto out;
3046
3047         status = -ENOMEM;
3048         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3049         if (data == NULL)
3050                 goto out;
3051
3052         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3053         data->arg.u.symlink.pages = &page;
3054         data->arg.u.symlink.len = len;
3055
3056         status = nfs4_do_create(dir, dentry, data);
3057
3058         nfs4_free_createdata(data);
3059 out:
3060         return status;
3061 }
3062
3063 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3064                 struct page *page, unsigned int len, struct iattr *sattr)
3065 {
3066         struct nfs4_exception exception = { };
3067         int err;
3068         do {
3069                 err = nfs4_handle_exception(NFS_SERVER(dir),
3070                                 _nfs4_proc_symlink(dir, dentry, page,
3071                                                         len, sattr),
3072                                 &exception);
3073         } while (exception.retry);
3074         return err;
3075 }
3076
3077 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3078                 struct iattr *sattr)
3079 {
3080         struct nfs4_createdata *data;
3081         int status = -ENOMEM;
3082
3083         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3084         if (data == NULL)
3085                 goto out;
3086
3087         status = nfs4_do_create(dir, dentry, data);
3088
3089         nfs4_free_createdata(data);
3090 out:
3091         return status;
3092 }
3093
3094 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3095                 struct iattr *sattr)
3096 {
3097         struct nfs4_exception exception = { };
3098         int err;
3099
3100         sattr->ia_mode &= ~current_umask();
3101         do {
3102                 err = nfs4_handle_exception(NFS_SERVER(dir),
3103                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3104                                 &exception);
3105         } while (exception.retry);
3106         return err;
3107 }
3108
3109 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3110                 u64 cookie, struct page **pages, unsigned int count, int plus)
3111 {
3112         struct inode            *dir = dentry->d_inode;
3113         struct nfs4_readdir_arg args = {
3114                 .fh = NFS_FH(dir),
3115                 .pages = pages,
3116                 .pgbase = 0,
3117                 .count = count,
3118                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3119                 .plus = plus,
3120         };
3121         struct nfs4_readdir_res res;
3122         struct rpc_message msg = {
3123                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3124                 .rpc_argp = &args,
3125                 .rpc_resp = &res,
3126                 .rpc_cred = cred,
3127         };
3128         int                     status;
3129
3130         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3131                         dentry->d_parent->d_name.name,
3132                         dentry->d_name.name,
3133                         (unsigned long long)cookie);
3134         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3135         res.pgbase = args.pgbase;
3136         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3137         if (status >= 0) {
3138                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3139                 status += args.pgbase;
3140         }
3141
3142         nfs_invalidate_atime(dir);
3143
3144         dprintk("%s: returns %d\n", __func__, status);
3145         return status;
3146 }
3147
3148 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3149                 u64 cookie, struct page **pages, unsigned int count, int plus)
3150 {
3151         struct nfs4_exception exception = { };
3152         int err;
3153         do {
3154                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3155                                 _nfs4_proc_readdir(dentry, cred, cookie,
3156                                         pages, count, plus),
3157                                 &exception);
3158         } while (exception.retry);
3159         return err;
3160 }
3161
3162 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3163                 struct iattr *sattr, dev_t rdev)
3164 {
3165         struct nfs4_createdata *data;
3166         int mode = sattr->ia_mode;
3167         int status = -ENOMEM;
3168
3169         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3170         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3171
3172         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3173         if (data == NULL)
3174                 goto out;
3175
3176         if (S_ISFIFO(mode))
3177                 data->arg.ftype = NF4FIFO;
3178         else if (S_ISBLK(mode)) {
3179                 data->arg.ftype = NF4BLK;
3180                 data->arg.u.device.specdata1 = MAJOR(rdev);
3181                 data->arg.u.device.specdata2 = MINOR(rdev);
3182         }
3183         else if (S_ISCHR(mode)) {
3184                 data->arg.ftype = NF4CHR;
3185                 data->arg.u.device.specdata1 = MAJOR(rdev);
3186                 data->arg.u.device.specdata2 = MINOR(rdev);
3187         }
3188
3189         status = nfs4_do_create(dir, dentry, data);
3190
3191         nfs4_free_createdata(data);
3192 out:
3193         return status;
3194 }
3195
3196 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3197                 struct iattr *sattr, dev_t rdev)
3198 {
3199         struct nfs4_exception exception = { };
3200         int err;
3201
3202         sattr->ia_mode &= ~current_umask();
3203         do {
3204                 err = nfs4_handle_exception(NFS_SERVER(dir),
3205                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3206                                 &exception);
3207         } while (exception.retry);
3208         return err;
3209 }
3210
3211 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3212                  struct nfs_fsstat *fsstat)
3213 {
3214         struct nfs4_statfs_arg args = {
3215                 .fh = fhandle,
3216                 .bitmask = server->attr_bitmask,
3217         };
3218         struct nfs4_statfs_res res = {
3219                 .fsstat = fsstat,
3220         };
3221         struct rpc_message msg = {
3222                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3223                 .rpc_argp = &args,
3224                 .rpc_resp = &res,
3225         };
3226
3227         nfs_fattr_init(fsstat->fattr);
3228         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3229 }
3230
3231 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3232 {
3233         struct nfs4_exception exception = { };
3234         int err;
3235         do {
3236                 err = nfs4_handle_exception(server,
3237                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3238                                 &exception);
3239         } while (exception.retry);
3240         return err;
3241 }
3242
3243 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3244                 struct nfs_fsinfo *fsinfo)
3245 {
3246         struct nfs4_fsinfo_arg args = {
3247                 .fh = fhandle,
3248                 .bitmask = server->attr_bitmask,
3249         };
3250         struct nfs4_fsinfo_res res = {
3251                 .fsinfo = fsinfo,
3252         };
3253         struct rpc_message msg = {
3254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3255                 .rpc_argp = &args,
3256                 .rpc_resp = &res,
3257         };
3258
3259         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3260 }
3261
3262 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3263 {
3264         struct nfs4_exception exception = { };
3265         int err;
3266
3267         do {
3268                 err = nfs4_handle_exception(server,
3269                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3270                                 &exception);
3271         } while (exception.retry);
3272         return err;
3273 }
3274
3275 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3276 {
3277         nfs_fattr_init(fsinfo->fattr);
3278         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3279 }
3280
3281 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3282                 struct nfs_pathconf *pathconf)
3283 {
3284         struct nfs4_pathconf_arg args = {
3285                 .fh = fhandle,
3286                 .bitmask = server->attr_bitmask,
3287         };
3288         struct nfs4_pathconf_res res = {
3289                 .pathconf = pathconf,
3290         };
3291         struct rpc_message msg = {
3292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3293                 .rpc_argp = &args,
3294                 .rpc_resp = &res,
3295         };
3296
3297         /* None of the pathconf attributes are mandatory to implement */
3298         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3299                 memset(pathconf, 0, sizeof(*pathconf));
3300                 return 0;
3301         }
3302
3303         nfs_fattr_init(pathconf->fattr);
3304         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3305 }
3306
3307 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3308                 struct nfs_pathconf *pathconf)
3309 {
3310         struct nfs4_exception exception = { };
3311         int err;
3312
3313         do {
3314                 err = nfs4_handle_exception(server,
3315                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3316                                 &exception);
3317         } while (exception.retry);
3318         return err;
3319 }
3320
3321 void __nfs4_read_done_cb(struct nfs_read_data *data)
3322 {
3323         nfs_invalidate_atime(data->inode);
3324 }
3325
3326 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3327 {
3328         struct nfs_server *server = NFS_SERVER(data->inode);
3329
3330         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3331                 rpc_restart_call_prepare(task);
3332                 return -EAGAIN;
3333         }
3334
3335         __nfs4_read_done_cb(data);
3336         if (task->tk_status > 0)
3337                 renew_lease(server, data->timestamp);
3338         return 0;
3339 }
3340
3341 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3342 {
3343
3344         dprintk("--> %s\n", __func__);
3345
3346         if (!nfs4_sequence_done(task, &data->res.seq_res))
3347                 return -EAGAIN;
3348
3349         return data->read_done_cb ? data->read_done_cb(task, data) :
3350                                     nfs4_read_done_cb(task, data);
3351 }
3352
3353 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3354 {
3355         data->timestamp   = jiffies;
3356         data->read_done_cb = nfs4_read_done_cb;
3357         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3358         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3359 }
3360
3361 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3362 {
3363         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3364                                 &data->args.seq_args,
3365                                 &data->res.seq_res,
3366                                 task))
3367                 return;
3368         rpc_call_start(task);
3369 }
3370
3371 /* Reset the the nfs_read_data to send the read to the MDS. */
3372 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3373 {
3374         dprintk("%s Reset task for i/o through\n", __func__);
3375         put_lseg(data->lseg);
3376         data->lseg = NULL;
3377         /* offsets will differ in the dense stripe case */
3378         data->args.offset = data->mds_offset;
3379         data->ds_clp = NULL;
3380         data->args.fh     = NFS_FH(data->inode);
3381         data->read_done_cb = nfs4_read_done_cb;
3382         task->tk_ops = data->mds_ops;
3383         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3384 }
3385 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3386
3387 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3388 {
3389         struct inode *inode = data->inode;
3390
3391         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3392                 rpc_restart_call_prepare(task);
3393                 return -EAGAIN;
3394         }
3395         if (task->tk_status >= 0) {
3396                 renew_lease(NFS_SERVER(inode), data->timestamp);
3397                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3398         }
3399         return 0;
3400 }
3401
3402 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3403 {
3404         if (!nfs4_sequence_done(task, &data->res.seq_res))
3405                 return -EAGAIN;
3406         return data->write_done_cb ? data->write_done_cb(task, data) :
3407                 nfs4_write_done_cb(task, data);
3408 }
3409
3410 /* Reset the the nfs_write_data to send the write to the MDS. */
3411 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3412 {
3413         dprintk("%s Reset task for i/o through\n", __func__);
3414         put_lseg(data->lseg);
3415         data->lseg          = NULL;
3416         data->ds_clp        = NULL;
3417         data->write_done_cb = nfs4_write_done_cb;
3418         data->args.fh       = NFS_FH(data->inode);
3419         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3420         data->args.offset   = data->mds_offset;
3421         data->res.fattr     = &data->fattr;
3422         task->tk_ops        = data->mds_ops;
3423         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3424 }
3425 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3426
3427 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3428 {
3429         struct nfs_server *server = NFS_SERVER(data->inode);
3430
3431         if (data->lseg) {
3432                 data->args.bitmask = NULL;
3433                 data->res.fattr = NULL;
3434         } else
3435                 data->args.bitmask = server->cache_consistency_bitmask;
3436         if (!data->write_done_cb)
3437                 data->write_done_cb = nfs4_write_done_cb;
3438         data->res.server = server;
3439         data->timestamp   = jiffies;
3440
3441         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3442         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3443 }
3444
3445 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3446 {
3447         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3448                                 &data->args.seq_args,
3449                                 &data->res.seq_res,
3450                                 task))
3451                 return;
3452         rpc_call_start(task);
3453 }
3454
3455 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3456 {
3457         struct inode *inode = data->inode;
3458
3459         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3460                 rpc_restart_call_prepare(task);
3461                 return -EAGAIN;
3462         }
3463         nfs_refresh_inode(inode, data->res.fattr);
3464         return 0;
3465 }
3466
3467 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3468 {
3469         if (!nfs4_sequence_done(task, &data->res.seq_res))
3470                 return -EAGAIN;
3471         return data->write_done_cb(task, data);
3472 }
3473
3474 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3475 {
3476         struct nfs_server *server = NFS_SERVER(data->inode);
3477
3478         if (data->lseg) {
3479                 data->args.bitmask = NULL;
3480                 data->res.fattr = NULL;
3481         } else
3482                 data->args.bitmask = server->cache_consistency_bitmask;
3483         if (!data->write_done_cb)
3484                 data->write_done_cb = nfs4_commit_done_cb;
3485         data->res.server = server;
3486         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3487         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3488 }
3489
3490 struct nfs4_renewdata {
3491         struct nfs_client       *client;
3492         unsigned long           timestamp;
3493 };
3494
3495 /*
3496  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3497  * standalone procedure for queueing an asynchronous RENEW.
3498  */
3499 static void nfs4_renew_release(void *calldata)
3500 {
3501         struct nfs4_renewdata *data = calldata;
3502         struct nfs_client *clp = data->client;
3503
3504         if (atomic_read(&clp->cl_count) > 1)
3505                 nfs4_schedule_state_renewal(clp);
3506         nfs_put_client(clp);
3507         kfree(data);
3508 }
3509
3510 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3511 {
3512         struct nfs4_renewdata *data = calldata;
3513         struct nfs_client *clp = data->client;
3514         unsigned long timestamp = data->timestamp;
3515
3516         if (task->tk_status < 0) {
3517                 /* Unless we're shutting down, schedule state recovery! */
3518                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3519                         return;
3520                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3521                         nfs4_schedule_lease_recovery(clp);
3522                         return;
3523                 }
3524                 nfs4_schedule_path_down_recovery(clp);
3525         }
3526         do_renew_lease(clp, timestamp);
3527 }
3528
3529 static const struct rpc_call_ops nfs4_renew_ops = {
3530         .rpc_call_done = nfs4_renew_done,
3531         .rpc_release = nfs4_renew_release,
3532 };
3533
3534 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3535 {
3536         struct rpc_message msg = {
3537                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3538                 .rpc_argp       = clp,
3539                 .rpc_cred       = cred,
3540         };
3541         struct nfs4_renewdata *data;
3542
3543         if (renew_flags == 0)
3544                 return 0;
3545         if (!atomic_inc_not_zero(&clp->cl_count))
3546                 return -EIO;
3547         data = kmalloc(sizeof(*data), GFP_NOFS);
3548         if (data == NULL)
3549                 return -ENOMEM;
3550         data->client = clp;
3551         data->timestamp = jiffies;
3552         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3553                         &nfs4_renew_ops, data);
3554 }
3555
3556 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3557 {
3558         struct rpc_message msg = {
3559                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3560                 .rpc_argp       = clp,
3561                 .rpc_cred       = cred,
3562         };
3563         unsigned long now = jiffies;
3564         int status;
3565
3566         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3567         if (status < 0)
3568                 return status;
3569         do_renew_lease(clp, now);
3570         return 0;
3571 }
3572
3573 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3574 {
3575         return (server->caps & NFS_CAP_ACLS)
3576                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3577                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3578 }
3579
3580 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3581  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3582  * the stack.
3583  */
3584 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3585
3586 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3587                 struct page **pages, unsigned int *pgbase)
3588 {
3589         struct page *newpage, **spages;
3590         int rc = 0;
3591         size_t len;
3592         spages = pages;
3593
3594         do {
3595                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3596                 newpage = alloc_page(GFP_KERNEL);
3597
3598                 if (newpage == NULL)
3599                         goto unwind;
3600                 memcpy(page_address(newpage), buf, len);
3601                 buf += len;
3602                 buflen -= len;
3603                 *pages++ = newpage;
3604                 rc++;
3605         } while (buflen != 0);
3606
3607         return rc;
3608
3609 unwind:
3610         for(; rc > 0; rc--)
3611                 __free_page(spages[rc-1]);
3612         return -ENOMEM;
3613 }
3614
3615 struct nfs4_cached_acl {
3616         int cached;
3617         size_t len;
3618         char data[0];
3619 };
3620
3621 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3622 {
3623         struct nfs_inode *nfsi = NFS_I(inode);
3624
3625         spin_lock(&inode->i_lock);
3626         kfree(nfsi->nfs4_acl);
3627         nfsi->nfs4_acl = acl;
3628         spin_unlock(&inode->i_lock);
3629 }
3630
3631 static void nfs4_zap_acl_attr(struct inode *inode)
3632 {
3633         nfs4_set_cached_acl(inode, NULL);
3634 }
3635
3636 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3637 {
3638         struct nfs_inode *nfsi = NFS_I(inode);
3639         struct nfs4_cached_acl *acl;
3640         int ret = -ENOENT;
3641
3642         spin_lock(&inode->i_lock);
3643         acl = nfsi->nfs4_acl;
3644         if (acl == NULL)
3645                 goto out;
3646         if (buf == NULL) /* user is just asking for length */
3647                 goto out_len;
3648         if (acl->cached == 0)
3649                 goto out;
3650         ret = -ERANGE; /* see getxattr(2) man page */
3651         if (acl->len > buflen)
3652                 goto out;
3653         memcpy(buf, acl->data, acl->len);
3654 out_len:
3655         ret = acl->len;
3656 out:
3657         spin_unlock(&inode->i_lock);
3658         return ret;
3659 }
3660
3661 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3662 {
3663         struct nfs4_cached_acl *acl;
3664
3665         if (pages && acl_len <= PAGE_SIZE) {
3666                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3667                 if (acl == NULL)
3668                         goto out;
3669                 acl->cached = 1;
3670                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3671         } else {
3672                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3673                 if (acl == NULL)
3674                         goto out;
3675                 acl->cached = 0;
3676         }
3677         acl->len = acl_len;
3678 out:
3679         nfs4_set_cached_acl(inode, acl);
3680 }
3681
3682 /*
3683  * The getxattr API returns the required buffer length when called with a
3684  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3685  * the required buf.  On a NULL buf, we send a page of data to the server
3686  * guessing that the ACL request can be serviced by a page. If so, we cache
3687  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3688  * the cache. If not so, we throw away the page, and cache the required
3689  * length. The next getxattr call will then produce another round trip to
3690  * the server, this time with the input buf of the required size.
3691  */
3692 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3693 {
3694         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3695         struct nfs_getaclargs args = {
3696                 .fh = NFS_FH(inode),
3697                 .acl_pages = pages,
3698                 .acl_len = buflen,
3699         };
3700         struct nfs_getaclres res = {
3701                 .acl_len = buflen,
3702         };
3703         struct rpc_message msg = {
3704                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3705                 .rpc_argp = &args,
3706                 .rpc_resp = &res,
3707         };
3708         int ret = -ENOMEM, npages, i, acl_len = 0;
3709
3710         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3711         /* As long as we're doing a round trip to the server anyway,
3712          * let's be prepared for a page of acl data. */
3713         if (npages == 0)
3714                 npages = 1;
3715
3716         /* Add an extra page to handle the bitmap returned */
3717         npages++;
3718
3719         for (i = 0; i < npages; i++) {
3720                 pages[i] = alloc_page(GFP_KERNEL);
3721                 if (!pages[i])
3722                         goto out_free;
3723         }
3724
3725         /* for decoding across pages */
3726         res.acl_scratch = alloc_page(GFP_KERNEL);
3727         if (!res.acl_scratch)
3728                 goto out_free;
3729
3730         args.acl_len = npages * PAGE_SIZE;
3731         args.acl_pgbase = 0;
3732
3733         /* Let decode_getfacl know not to fail if the ACL data is larger than
3734          * the page we send as a guess */
3735         if (buf == NULL)
3736                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3737
3738         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3739                 __func__, buf, buflen, npages, args.acl_len);
3740         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3741                              &msg, &args.seq_args, &res.seq_res, 0);
3742         if (ret)
3743                 goto out_free;
3744
3745         acl_len = res.acl_len - res.acl_data_offset;
3746         if (acl_len > args.acl_len)
3747                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3748         else
3749                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3750                                       acl_len);
3751         if (buf) {
3752                 ret = -ERANGE;
3753                 if (acl_len > buflen)
3754                         goto out_free;
3755                 _copy_from_pages(buf, pages, res.acl_data_offset,
3756                                 acl_len);
3757         }
3758         ret = acl_len;
3759 out_free:
3760         for (i = 0; i < npages; i++)
3761                 if (pages[i])
3762                         __free_page(pages[i]);
3763         if (res.acl_scratch)
3764                 __free_page(res.acl_scratch);
3765         return ret;
3766 }
3767
3768 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3769 {
3770         struct nfs4_exception exception = { };
3771         ssize_t ret;
3772         do {
3773                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3774                 if (ret >= 0)
3775                         break;
3776                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3777         } while (exception.retry);
3778         return ret;
3779 }
3780
3781 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3782 {
3783         struct nfs_server *server = NFS_SERVER(inode);
3784         int ret;
3785
3786         if (!nfs4_server_supports_acls(server))
3787                 return -EOPNOTSUPP;
3788         ret = nfs_revalidate_inode(server, inode);
3789         if (ret < 0)
3790                 return ret;
3791         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3792                 nfs_zap_acl_cache(inode);
3793         ret = nfs4_read_cached_acl(inode, buf, buflen);
3794         if (ret != -ENOENT)
3795                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3796                  * but no cached acl data, just the acl length */
3797                 return ret;
3798         return nfs4_get_acl_uncached(inode, buf, buflen);
3799 }
3800
3801 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3802 {
3803         struct nfs_server *server = NFS_SERVER(inode);
3804         struct page *pages[NFS4ACL_MAXPAGES];
3805         struct nfs_setaclargs arg = {
3806                 .fh             = NFS_FH(inode),
3807                 .acl_pages      = pages,
3808                 .acl_len        = buflen,
3809         };
3810         struct nfs_setaclres res;
3811         struct rpc_message msg = {
3812                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3813                 .rpc_argp       = &arg,
3814                 .rpc_resp       = &res,
3815         };
3816         int ret, i;
3817
3818         if (!nfs4_server_supports_acls(server))
3819                 return -EOPNOTSUPP;
3820         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3821         if (i < 0)
3822                 return i;
3823         nfs_inode_return_delegation(inode);
3824         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3825
3826         /*
3827          * Free each page after tx, so the only ref left is
3828          * held by the network stack
3829          */
3830         for (; i > 0; i--)
3831                 put_page(pages[i-1]);
3832
3833         /*
3834          * Acl update can result in inode attribute update.
3835          * so mark the attribute cache invalid.
3836          */
3837         spin_lock(&inode->i_lock);
3838         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3839         spin_unlock(&inode->i_lock);
3840         nfs_access_zap_cache(inode);
3841         nfs_zap_acl_cache(inode);
3842         return ret;
3843 }
3844
3845 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3846 {
3847         struct nfs4_exception exception = { };
3848         int err;
3849         do {
3850                 err = nfs4_handle_exception(NFS_SERVER(inode),
3851                                 __nfs4_proc_set_acl(inode, buf, buflen),
3852                                 &exception);
3853         } while (exception.retry);
3854         return err;
3855 }
3856
3857 static int
3858 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3859 {
3860         struct nfs_client *clp = server->nfs_client;
3861
3862         if (task->tk_status >= 0)
3863                 return 0;
3864         switch(task->tk_status) {
3865                 case -NFS4ERR_DELEG_REVOKED:
3866                 case -NFS4ERR_ADMIN_REVOKED:
3867                 case -NFS4ERR_BAD_STATEID:
3868                         if (state == NULL)
3869                                 break;
3870                         nfs_remove_bad_delegation(state->inode);
3871                 case -NFS4ERR_OPENMODE:
3872                         if (state == NULL)
3873                                 break;
3874                         nfs4_schedule_stateid_recovery(server, state);
3875                         goto wait_on_recovery;
3876                 case -NFS4ERR_EXPIRED:
3877                         if (state != NULL)
3878                                 nfs4_schedule_stateid_recovery(server, state);
3879                 case -NFS4ERR_STALE_STATEID:
3880                 case -NFS4ERR_STALE_CLIENTID:
3881                         nfs4_schedule_lease_recovery(clp);
3882                         goto wait_on_recovery;
3883 #if defined(CONFIG_NFS_V4_1)
3884                 case -NFS4ERR_BADSESSION:
3885                 case -NFS4ERR_BADSLOT:
3886                 case -NFS4ERR_BAD_HIGH_SLOT:
3887                 case -NFS4ERR_DEADSESSION:
3888                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3889                 case -NFS4ERR_SEQ_FALSE_RETRY:
3890                 case -NFS4ERR_SEQ_MISORDERED:
3891                         dprintk("%s ERROR %d, Reset session\n", __func__,
3892                                 task->tk_status);
3893                         nfs4_schedule_session_recovery(clp->cl_session);
3894                         task->tk_status = 0;
3895                         return -EAGAIN;
3896 #endif /* CONFIG_NFS_V4_1 */
3897                 case -NFS4ERR_DELAY:
3898                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3899                 case -NFS4ERR_GRACE:
3900                 case -EKEYEXPIRED:
3901                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3902                         task->tk_status = 0;
3903                         return -EAGAIN;
3904                 case -NFS4ERR_RETRY_UNCACHED_REP:
3905                 case -NFS4ERR_OLD_STATEID:
3906                         task->tk_status = 0;
3907                         return -EAGAIN;
3908         }
3909         task->tk_status = nfs4_map_errors(task->tk_status);
3910         return 0;
3911 wait_on_recovery:
3912         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3913         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3914                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3915         task->tk_status = 0;
3916         return -EAGAIN;
3917 }
3918
3919 static void nfs4_construct_boot_verifier(struct nfs_client *clp,
3920                                          nfs4_verifier *bootverf)
3921 {
3922         __be32 verf[2];
3923
3924         verf[0] = htonl((u32)clp->cl_boot_time.tv_sec);
3925         verf[1] = htonl((u32)clp->cl_boot_time.tv_nsec);
3926         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3927 }
3928
3929 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3930                 unsigned short port, struct rpc_cred *cred,
3931                 struct nfs4_setclientid_res *res)
3932 {
3933         nfs4_verifier sc_verifier;
3934         struct nfs4_setclientid setclientid = {
3935                 .sc_verifier = &sc_verifier,
3936                 .sc_prog = program,
3937                 .sc_cb_ident = clp->cl_cb_ident,
3938         };
3939         struct rpc_message msg = {
3940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3941                 .rpc_argp = &setclientid,
3942                 .rpc_resp = res,
3943                 .rpc_cred = cred,
3944         };
3945         int loop = 0;
3946         int status;
3947
3948         nfs4_construct_boot_verifier(clp, &sc_verifier);
3949
3950         for(;;) {
3951                 rcu_read_lock();
3952                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3953                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3954                                 clp->cl_ipaddr,
3955                                 rpc_peeraddr2str(clp->cl_rpcclient,
3956                                                         RPC_DISPLAY_ADDR),
3957                                 rpc_peeraddr2str(clp->cl_rpcclient,
3958                                                         RPC_DISPLAY_PROTO),
3959                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3960                                 clp->cl_id_uniquifier);
3961                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3962                                 sizeof(setclientid.sc_netid),
3963                                 rpc_peeraddr2str(clp->cl_rpcclient,
3964                                                         RPC_DISPLAY_NETID));
3965                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3966                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3967                                 clp->cl_ipaddr, port >> 8, port & 255);
3968                 rcu_read_unlock();
3969
3970                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3971                 if (status != -NFS4ERR_CLID_INUSE)
3972                         break;
3973                 if (loop != 0) {
3974                         ++clp->cl_id_uniquifier;
3975                         break;
3976                 }
3977                 ++loop;
3978                 ssleep(clp->cl_lease_time / HZ + 1);
3979         }
3980         return status;
3981 }
3982
3983 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3984                 struct nfs4_setclientid_res *arg,
3985                 struct rpc_cred *cred)
3986 {
3987         struct nfs_fsinfo fsinfo;
3988         struct rpc_message msg = {
3989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3990                 .rpc_argp = arg,
3991                 .rpc_resp = &fsinfo,
3992                 .rpc_cred = cred,
3993         };
3994         unsigned long now;
3995         int status;
3996
3997         now = jiffies;
3998         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3999         if (status == 0) {
4000                 spin_lock(&clp->cl_lock);
4001                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4002                 clp->cl_last_renewal = now;
4003                 spin_unlock(&clp->cl_lock);
4004         }
4005         return status;
4006 }
4007
4008 struct nfs4_delegreturndata {
4009         struct nfs4_delegreturnargs args;
4010         struct nfs4_delegreturnres res;
4011         struct nfs_fh fh;
4012         nfs4_stateid stateid;
4013         unsigned long timestamp;
4014         struct nfs_fattr fattr;
4015         int rpc_status;
4016 };
4017
4018 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4019 {
4020         struct nfs4_delegreturndata *data = calldata;
4021
4022         if (!nfs4_sequence_done(task, &data->res.seq_res))
4023                 return;
4024
4025         switch (task->tk_status) {
4026         case -NFS4ERR_STALE_STATEID:
4027         case -NFS4ERR_EXPIRED:
4028         case 0:
4029                 renew_lease(data->res.server, data->timestamp);
4030                 break;
4031         default:
4032                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4033                                 -EAGAIN) {
4034                         rpc_restart_call_prepare(task);
4035                         return;
4036                 }
4037         }
4038         data->rpc_status = task->tk_status;
4039 }
4040
4041 static void nfs4_delegreturn_release(void *calldata)
4042 {
4043         kfree(calldata);
4044 }
4045
4046 #if defined(CONFIG_NFS_V4_1)
4047 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4048 {
4049         struct nfs4_delegreturndata *d_data;
4050
4051         d_data = (struct nfs4_delegreturndata *)data;
4052
4053         if (nfs4_setup_sequence(d_data->res.server,
4054                                 &d_data->args.seq_args,
4055                                 &d_data->res.seq_res, task))
4056                 return;
4057         rpc_call_start(task);
4058 }
4059 #endif /* CONFIG_NFS_V4_1 */
4060
4061 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4062 #if defined(CONFIG_NFS_V4_1)
4063         .rpc_call_prepare = nfs4_delegreturn_prepare,
4064 #endif /* CONFIG_NFS_V4_1 */
4065         .rpc_call_done = nfs4_delegreturn_done,
4066         .rpc_release = nfs4_delegreturn_release,
4067 };
4068
4069 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4070 {
4071         struct nfs4_delegreturndata *data;
4072         struct nfs_server *server = NFS_SERVER(inode);
4073         struct rpc_task *task;
4074         struct rpc_message msg = {
4075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4076                 .rpc_cred = cred,
4077         };
4078         struct rpc_task_setup task_setup_data = {
4079                 .rpc_client = server->client,
4080                 .rpc_message = &msg,
4081                 .callback_ops = &nfs4_delegreturn_ops,
4082                 .flags = RPC_TASK_ASYNC,
4083         };
4084         int status = 0;
4085
4086         data = kzalloc(sizeof(*data), GFP_NOFS);
4087         if (data == NULL)
4088                 return -ENOMEM;
4089         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4090         data->args.fhandle = &data->fh;
4091         data->args.stateid = &data->stateid;
4092         data->args.bitmask = server->attr_bitmask;
4093         nfs_copy_fh(&data->fh, NFS_FH(inode));
4094         nfs4_stateid_copy(&data->stateid, stateid);
4095         data->res.fattr = &data->fattr;
4096         data->res.server = server;
4097         nfs_fattr_init(data->res.fattr);
4098         data->timestamp = jiffies;
4099         data->rpc_status = 0;
4100
4101         task_setup_data.callback_data = data;
4102         msg.rpc_argp = &data->args;
4103         msg.rpc_resp = &data->res;
4104         task = rpc_run_task(&task_setup_data);
4105         if (IS_ERR(task))
4106                 return PTR_ERR(task);
4107         if (!issync)
4108                 goto out;
4109         status = nfs4_wait_for_completion_rpc_task(task);
4110         if (status != 0)
4111                 goto out;
4112         status = data->rpc_status;
4113         if (status != 0)
4114                 goto out;
4115         nfs_refresh_inode(inode, &data->fattr);
4116 out:
4117         rpc_put_task(task);
4118         return status;
4119 }
4120
4121 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4122 {
4123         struct nfs_server *server = NFS_SERVER(inode);
4124         struct nfs4_exception exception = { };
4125         int err;
4126         do {
4127                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4128                 switch (err) {
4129                         case -NFS4ERR_STALE_STATEID:
4130                         case -NFS4ERR_EXPIRED:
4131                         case 0:
4132                                 return 0;
4133                 }
4134                 err = nfs4_handle_exception(server, err, &exception);
4135         } while (exception.retry);
4136         return err;
4137 }
4138
4139 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4140 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4141
4142 /*
4143  * sleep, with exponential backoff, and retry the LOCK operation.
4144  */
4145 static unsigned long
4146 nfs4_set_lock_task_retry(unsigned long timeout)
4147 {
4148         freezable_schedule_timeout_killable(timeout);
4149         timeout <<= 1;
4150         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4151                 return NFS4_LOCK_MAXTIMEOUT;
4152         return timeout;
4153 }
4154
4155 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4156 {
4157         struct inode *inode = state->inode;
4158         struct nfs_server *server = NFS_SERVER(inode);
4159         struct nfs_client *clp = server->nfs_client;
4160         struct nfs_lockt_args arg = {
4161                 .fh = NFS_FH(inode),
4162                 .fl = request,
4163         };
4164         struct nfs_lockt_res res = {
4165                 .denied = request,
4166         };
4167         struct rpc_message msg = {
4168                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4169                 .rpc_argp       = &arg,
4170                 .rpc_resp       = &res,
4171                 .rpc_cred       = state->owner->so_cred,
4172         };
4173         struct nfs4_lock_state *lsp;
4174         int status;
4175
4176         arg.lock_owner.clientid = clp->cl_clientid;
4177         status = nfs4_set_lock_state(state, request);
4178         if (status != 0)
4179                 goto out;
4180         lsp = request->fl_u.nfs4_fl.owner;
4181         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4182         arg.lock_owner.s_dev = server->s_dev;
4183         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4184         switch (status) {
4185                 case 0:
4186                         request->fl_type = F_UNLCK;
4187                         break;
4188                 case -NFS4ERR_DENIED:
4189                         status = 0;
4190         }
4191         request->fl_ops->fl_release_private(request);
4192 out:
4193         return status;
4194 }
4195
4196 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4197 {
4198         struct nfs4_exception exception = { };
4199         int err;
4200
4201         do {
4202                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4203                                 _nfs4_proc_getlk(state, cmd, request),
4204                                 &exception);
4205         } while (exception.retry);
4206         return err;
4207 }
4208
4209 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4210 {
4211         int res = 0;
4212         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4213                 case FL_POSIX:
4214                         res = posix_lock_file_wait(file, fl);
4215                         break;
4216                 case FL_FLOCK:
4217                         res = flock_lock_file_wait(file, fl);
4218                         break;
4219                 default:
4220                         BUG();
4221         }
4222         return res;
4223 }
4224
4225 struct nfs4_unlockdata {
4226         struct nfs_locku_args arg;
4227         struct nfs_locku_res res;
4228         struct nfs4_lock_state *lsp;
4229         struct nfs_open_context *ctx;
4230         struct file_lock fl;
4231         const struct nfs_server *server;
4232         unsigned long timestamp;
4233 };
4234
4235 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4236                 struct nfs_open_context *ctx,
4237                 struct nfs4_lock_state *lsp,
4238                 struct nfs_seqid *seqid)
4239 {
4240         struct nfs4_unlockdata *p;
4241         struct inode *inode = lsp->ls_state->inode;
4242
4243         p = kzalloc(sizeof(*p), GFP_NOFS);
4244         if (p == NULL)
4245                 return NULL;
4246         p->arg.fh = NFS_FH(inode);
4247         p->arg.fl = &p->fl;
4248         p->arg.seqid = seqid;
4249         p->res.seqid = seqid;
4250         p->arg.stateid = &lsp->ls_stateid;
4251         p->lsp = lsp;
4252         atomic_inc(&lsp->ls_count);
4253         /* Ensure we don't close file until we're done freeing locks! */
4254         p->ctx = get_nfs_open_context(ctx);
4255         memcpy(&p->fl, fl, sizeof(p->fl));
4256         p->server = NFS_SERVER(inode);
4257         return p;
4258 }
4259
4260 static void nfs4_locku_release_calldata(void *data)
4261 {
4262         struct nfs4_unlockdata *calldata = data;
4263         nfs_free_seqid(calldata->arg.seqid);
4264         nfs4_put_lock_state(calldata->lsp);
4265         put_nfs_open_context(calldata->ctx);
4266         kfree(calldata);
4267 }
4268
4269 static void nfs4_locku_done(struct rpc_task *task, void *data)
4270 {
4271         struct nfs4_unlockdata *calldata = data;
4272
4273         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4274                 return;
4275         switch (task->tk_status) {
4276                 case 0:
4277                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4278                                         &calldata->res.stateid);
4279                         renew_lease(calldata->server, calldata->timestamp);
4280                         break;
4281                 case -NFS4ERR_BAD_STATEID:
4282                 case -NFS4ERR_OLD_STATEID:
4283                 case -NFS4ERR_STALE_STATEID:
4284                 case -NFS4ERR_EXPIRED:
4285                         break;
4286                 default:
4287                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4288                                 rpc_restart_call_prepare(task);
4289         }
4290 }
4291
4292 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4293 {
4294         struct nfs4_unlockdata *calldata = data;
4295
4296         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4297                 return;
4298         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4299                 /* Note: exit _without_ running nfs4_locku_done */
4300                 task->tk_action = NULL;
4301                 return;
4302         }
4303         calldata->timestamp = jiffies;
4304         if (nfs4_setup_sequence(calldata->server,
4305                                 &calldata->arg.seq_args,
4306                                 &calldata->res.seq_res, task))
4307                 return;
4308         rpc_call_start(task);
4309 }
4310
4311 static const struct rpc_call_ops nfs4_locku_ops = {
4312         .rpc_call_prepare = nfs4_locku_prepare,
4313         .rpc_call_done = nfs4_locku_done,
4314         .rpc_release = nfs4_locku_release_calldata,
4315 };
4316
4317 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4318                 struct nfs_open_context *ctx,
4319                 struct nfs4_lock_state *lsp,
4320                 struct nfs_seqid *seqid)
4321 {
4322         struct nfs4_unlockdata *data;
4323         struct rpc_message msg = {
4324                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4325                 .rpc_cred = ctx->cred,
4326         };
4327         struct rpc_task_setup task_setup_data = {
4328                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4329                 .rpc_message = &msg,
4330                 .callback_ops = &nfs4_locku_ops,
4331                 .workqueue = nfsiod_workqueue,
4332                 .flags = RPC_TASK_ASYNC,
4333         };
4334
4335         /* Ensure this is an unlock - when canceling a lock, the
4336          * canceled lock is passed in, and it won't be an unlock.
4337          */
4338         fl->fl_type = F_UNLCK;
4339
4340         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4341         if (data == NULL) {
4342                 nfs_free_seqid(seqid);
4343                 return ERR_PTR(-ENOMEM);
4344         }
4345
4346         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4347         msg.rpc_argp = &data->arg;
4348         msg.rpc_resp = &data->res;
4349         task_setup_data.callback_data = data;
4350         return rpc_run_task(&task_setup_data);
4351 }
4352
4353 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4354 {
4355         struct nfs_inode *nfsi = NFS_I(state->inode);
4356         struct nfs_seqid *seqid;
4357         struct nfs4_lock_state *lsp;
4358         struct rpc_task *task;
4359         int status = 0;
4360         unsigned char fl_flags = request->fl_flags;
4361
4362         status = nfs4_set_lock_state(state, request);
4363         /* Unlock _before_ we do the RPC call */
4364         request->fl_flags |= FL_EXISTS;
4365         down_read(&nfsi->rwsem);
4366         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4367                 up_read(&nfsi->rwsem);
4368                 goto out;
4369         }
4370         up_read(&nfsi->rwsem);
4371         if (status != 0)
4372                 goto out;
4373         /* Is this a delegated lock? */
4374         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4375                 goto out;
4376         lsp = request->fl_u.nfs4_fl.owner;
4377         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4378         status = -ENOMEM;
4379         if (seqid == NULL)
4380                 goto out;
4381         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4382         status = PTR_ERR(task);
4383         if (IS_ERR(task))
4384                 goto out;
4385         status = nfs4_wait_for_completion_rpc_task(task);
4386         rpc_put_task(task);
4387 out:
4388         request->fl_flags = fl_flags;
4389         return status;
4390 }
4391
4392 struct nfs4_lockdata {
4393         struct nfs_lock_args arg;
4394         struct nfs_lock_res res;
4395         struct nfs4_lock_state *lsp;
4396         struct nfs_open_context *ctx;
4397         struct file_lock fl;
4398         unsigned long timestamp;
4399         int rpc_status;
4400         int cancelled;
4401         struct nfs_server *server;
4402 };
4403
4404 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4405                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4406                 gfp_t gfp_mask)
4407 {
4408         struct nfs4_lockdata *p;
4409         struct inode *inode = lsp->ls_state->inode;
4410         struct nfs_server *server = NFS_SERVER(inode);
4411
4412         p = kzalloc(sizeof(*p), gfp_mask);
4413         if (p == NULL)
4414                 return NULL;
4415
4416         p->arg.fh = NFS_FH(inode);
4417         p->arg.fl = &p->fl;
4418         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4419         if (p->arg.open_seqid == NULL)
4420                 goto out_free;
4421         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4422         if (p->arg.lock_seqid == NULL)
4423                 goto out_free_seqid;
4424         p->arg.lock_stateid = &lsp->ls_stateid;
4425         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4426         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4427         p->arg.lock_owner.s_dev = server->s_dev;
4428         p->res.lock_seqid = p->arg.lock_seqid;
4429         p->lsp = lsp;
4430         p->server = server;
4431         atomic_inc(&lsp->ls_count);
4432         p->ctx = get_nfs_open_context(ctx);
4433         memcpy(&p->fl, fl, sizeof(p->fl));
4434         return p;
4435 out_free_seqid:
4436         nfs_free_seqid(p->arg.open_seqid);
4437 out_free:
4438         kfree(p);
4439         return NULL;
4440 }
4441
4442 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4443 {
4444         struct nfs4_lockdata *data = calldata;
4445         struct nfs4_state *state = data->lsp->ls_state;
4446
4447         dprintk("%s: begin!\n", __func__);
4448         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4449                 return;
4450         /* Do we need to do an open_to_lock_owner? */
4451         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4452                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4453                         return;
4454                 data->arg.open_stateid = &state->stateid;
4455                 data->arg.new_lock_owner = 1;
4456                 data->res.open_seqid = data->arg.open_seqid;
4457         } else
4458                 data->arg.new_lock_owner = 0;
4459         data->timestamp = jiffies;
4460         if (nfs4_setup_sequence(data->server,
4461                                 &data->arg.seq_args,
4462                                 &data->res.seq_res, task))
4463                 return;
4464         rpc_call_start(task);
4465         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4466 }
4467
4468 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4469 {
4470         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4471         nfs4_lock_prepare(task, calldata);
4472 }
4473
4474 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4475 {
4476         struct nfs4_lockdata *data = calldata;
4477
4478         dprintk("%s: begin!\n", __func__);
4479
4480         if (!nfs4_sequence_done(task, &data->res.seq_res))
4481                 return;
4482
4483         data->rpc_status = task->tk_status;
4484         if (data->arg.new_lock_owner != 0) {
4485                 if (data->rpc_status == 0)
4486                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4487                 else
4488                         goto out;
4489         }
4490         if (data->rpc_status == 0) {
4491                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4492                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4493                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4494         }
4495 out:
4496         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4497 }
4498
4499 static void nfs4_lock_release(void *calldata)
4500 {
4501         struct nfs4_lockdata *data = calldata;
4502
4503         dprintk("%s: begin!\n", __func__);
4504         nfs_free_seqid(data->arg.open_seqid);
4505         if (data->cancelled != 0) {
4506                 struct rpc_task *task;
4507                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4508                                 data->arg.lock_seqid);
4509                 if (!IS_ERR(task))
4510                         rpc_put_task_async(task);
4511                 dprintk("%s: cancelling lock!\n", __func__);
4512         } else
4513                 nfs_free_seqid(data->arg.lock_seqid);
4514         nfs4_put_lock_state(data->lsp);
4515         put_nfs_open_context(data->ctx);
4516         kfree(data);
4517         dprintk("%s: done!\n", __func__);
4518 }
4519
4520 static const struct rpc_call_ops nfs4_lock_ops = {
4521         .rpc_call_prepare = nfs4_lock_prepare,
4522         .rpc_call_done = nfs4_lock_done,
4523         .rpc_release = nfs4_lock_release,
4524 };
4525
4526 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4527         .rpc_call_prepare = nfs4_recover_lock_prepare,
4528         .rpc_call_done = nfs4_lock_done,
4529         .rpc_release = nfs4_lock_release,
4530 };
4531
4532 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4533 {
4534         switch (error) {
4535         case -NFS4ERR_ADMIN_REVOKED:
4536         case -NFS4ERR_BAD_STATEID:
4537                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4538                 if (new_lock_owner != 0 ||
4539                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4540                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4541                 break;
4542         case -NFS4ERR_STALE_STATEID:
4543                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4544         case -NFS4ERR_EXPIRED:
4545                 nfs4_schedule_lease_recovery(server->nfs_client);
4546         };
4547 }
4548
4549 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4550 {
4551         struct nfs4_lockdata *data;
4552         struct rpc_task *task;
4553         struct rpc_message msg = {
4554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4555                 .rpc_cred = state->owner->so_cred,
4556         };
4557         struct rpc_task_setup task_setup_data = {
4558                 .rpc_client = NFS_CLIENT(state->inode),
4559                 .rpc_message = &msg,
4560                 .callback_ops = &nfs4_lock_ops,
4561                 .workqueue = nfsiod_workqueue,
4562                 .flags = RPC_TASK_ASYNC,
4563         };
4564         int ret;
4565
4566         dprintk("%s: begin!\n", __func__);
4567         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4568                         fl->fl_u.nfs4_fl.owner,
4569                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4570         if (data == NULL)
4571                 return -ENOMEM;
4572         if (IS_SETLKW(cmd))
4573                 data->arg.block = 1;
4574         if (recovery_type > NFS_LOCK_NEW) {
4575                 if (recovery_type == NFS_LOCK_RECLAIM)
4576                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4577                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4578         }
4579         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4580         msg.rpc_argp = &data->arg;
4581         msg.rpc_resp = &data->res;
4582         task_setup_data.callback_data = data;
4583         task = rpc_run_task(&task_setup_data);
4584         if (IS_ERR(task))
4585                 return PTR_ERR(task);
4586         ret = nfs4_wait_for_completion_rpc_task(task);
4587         if (ret == 0) {
4588                 ret = data->rpc_status;
4589                 if (ret)
4590                         nfs4_handle_setlk_error(data->server, data->lsp,
4591                                         data->arg.new_lock_owner, ret);
4592         } else
4593                 data->cancelled = 1;
4594         rpc_put_task(task);
4595         dprintk("%s: done, ret = %d!\n", __func__, ret);
4596         return ret;
4597 }
4598
4599 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4600 {
4601         struct nfs_server *server = NFS_SERVER(state->inode);
4602         struct nfs4_exception exception = {
4603                 .inode = state->inode,
4604         };
4605         int err;
4606
4607         do {
4608                 /* Cache the lock if possible... */
4609                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4610                         return 0;
4611                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4612                 if (err != -NFS4ERR_DELAY)
4613                         break;
4614                 nfs4_handle_exception(server, err, &exception);
4615         } while (exception.retry);
4616         return err;
4617 }
4618
4619 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4620 {
4621         struct nfs_server *server = NFS_SERVER(state->inode);
4622         struct nfs4_exception exception = {
4623                 .inode = state->inode,
4624         };
4625         int err;
4626
4627         err = nfs4_set_lock_state(state, request);
4628         if (err != 0)
4629                 return err;
4630         do {
4631                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4632                         return 0;
4633                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4634                 switch (err) {
4635                 default:
4636                         goto out;
4637                 case -NFS4ERR_GRACE:
4638                 case -NFS4ERR_DELAY:
4639                         nfs4_handle_exception(server, err, &exception);
4640                         err = 0;
4641                 }
4642         } while (exception.retry);
4643 out:
4644         return err;
4645 }
4646
4647 #if defined(CONFIG_NFS_V4_1)
4648 static int nfs41_check_expired_locks(struct nfs4_state *state)
4649 {
4650         int status, ret = NFS_OK;
4651         struct nfs4_lock_state *lsp;
4652         struct nfs_server *server = NFS_SERVER(state->inode);
4653
4654         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4655                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4656                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4657                         if (status != NFS_OK) {
4658                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4659                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4660                                 ret = status;
4661                         }
4662                 }
4663         };
4664
4665         return ret;
4666 }
4667
4668 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4669 {
4670         int status = NFS_OK;
4671
4672         if (test_bit(LK_STATE_IN_USE, &state->flags))
4673                 status = nfs41_check_expired_locks(state);
4674         if (status == NFS_OK)
4675                 return status;
4676         return nfs4_lock_expired(state, request);
4677 }
4678 #endif
4679
4680 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4681 {
4682         struct nfs_inode *nfsi = NFS_I(state->inode);
4683         unsigned char fl_flags = request->fl_flags;
4684         int status = -ENOLCK;
4685
4686         if ((fl_flags & FL_POSIX) &&
4687                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4688                 goto out;
4689         /* Is this a delegated open? */
4690         status = nfs4_set_lock_state(state, request);
4691         if (status != 0)
4692                 goto out;
4693         request->fl_flags |= FL_ACCESS;
4694         status = do_vfs_lock(request->fl_file, request);
4695         if (status < 0)
4696                 goto out;
4697         down_read(&nfsi->rwsem);
4698         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4699                 /* Yes: cache locks! */
4700                 /* ...but avoid races with delegation recall... */
4701                 request->fl_flags = fl_flags & ~FL_SLEEP;
4702                 status = do_vfs_lock(request->fl_file, request);
4703                 goto out_unlock;
4704         }
4705         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4706         if (status != 0)
4707                 goto out_unlock;
4708         /* Note: we always want to sleep here! */
4709         request->fl_flags = fl_flags | FL_SLEEP;
4710         if (do_vfs_lock(request->fl_file, request) < 0)
4711                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4712                         "manager!\n", __func__);
4713 out_unlock:
4714         up_read(&nfsi->rwsem);
4715 out:
4716         request->fl_flags = fl_flags;
4717         return status;
4718 }
4719
4720 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4721 {
4722         struct nfs4_exception exception = {
4723                 .state = state,
4724                 .inode = state->inode,
4725         };
4726         int err;
4727
4728         do {
4729                 err = _nfs4_proc_setlk(state, cmd, request);
4730                 if (err == -NFS4ERR_DENIED)
4731                         err = -EAGAIN;
4732                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4733                                 err, &exception);
4734         } while (exception.retry);
4735         return err;
4736 }
4737
4738 static int
4739 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4740 {
4741         struct nfs_open_context *ctx;
4742         struct nfs4_state *state;
4743         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4744         int status;
4745
4746         /* verify open state */
4747         ctx = nfs_file_open_context(filp);
4748         state = ctx->state;
4749
4750         if (request->fl_start < 0 || request->fl_end < 0)
4751                 return -EINVAL;
4752
4753         if (IS_GETLK(cmd)) {
4754                 if (state != NULL)
4755                         return nfs4_proc_getlk(state, F_GETLK, request);
4756                 return 0;
4757         }
4758
4759         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4760                 return -EINVAL;
4761
4762         if (request->fl_type == F_UNLCK) {
4763                 if (state != NULL)
4764                         return nfs4_proc_unlck(state, cmd, request);
4765                 return 0;
4766         }
4767
4768         if (state == NULL)
4769                 return -ENOLCK;
4770         /*
4771          * Don't rely on the VFS having checked the file open mode,
4772          * since it won't do this for flock() locks.
4773          */
4774         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4775         case F_RDLCK:
4776                 if (!(filp->f_mode & FMODE_READ))
4777                         return -EBADF;
4778                 break;
4779         case F_WRLCK:
4780                 if (!(filp->f_mode & FMODE_WRITE))
4781                         return -EBADF;
4782         }
4783
4784         do {
4785                 status = nfs4_proc_setlk(state, cmd, request);
4786                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4787                         break;
4788                 timeout = nfs4_set_lock_task_retry(timeout);
4789                 status = -ERESTARTSYS;
4790                 if (signalled())
4791                         break;
4792         } while(status < 0);
4793         return status;
4794 }
4795
4796 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4797 {
4798         struct nfs_server *server = NFS_SERVER(state->inode);
4799         struct nfs4_exception exception = { };
4800         int err;
4801
4802         err = nfs4_set_lock_state(state, fl);
4803         if (err != 0)
4804                 goto out;
4805         do {
4806                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4807                 switch (err) {
4808                         default:
4809                                 printk(KERN_ERR "NFS: %s: unhandled error "
4810                                         "%d.\n", __func__, err);
4811                         case 0:
4812                         case -ESTALE:
4813                                 goto out;
4814                         case -NFS4ERR_EXPIRED:
4815                                 nfs4_schedule_stateid_recovery(server, state);
4816                         case -NFS4ERR_STALE_CLIENTID:
4817                         case -NFS4ERR_STALE_STATEID:
4818                                 nfs4_schedule_lease_recovery(server->nfs_client);
4819                                 goto out;
4820                         case -NFS4ERR_BADSESSION:
4821                         case -NFS4ERR_BADSLOT:
4822                         case -NFS4ERR_BAD_HIGH_SLOT:
4823                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4824                         case -NFS4ERR_DEADSESSION:
4825                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4826                                 goto out;
4827                         case -ERESTARTSYS:
4828                                 /*
4829                                  * The show must go on: exit, but mark the
4830                                  * stateid as needing recovery.
4831                                  */
4832                         case -NFS4ERR_DELEG_REVOKED:
4833                         case -NFS4ERR_ADMIN_REVOKED:
4834                         case -NFS4ERR_BAD_STATEID:
4835                         case -NFS4ERR_OPENMODE:
4836                                 nfs4_schedule_stateid_recovery(server, state);
4837                                 err = 0;
4838                                 goto out;
4839                         case -EKEYEXPIRED:
4840                                 /*
4841                                  * User RPCSEC_GSS context has expired.
4842                                  * We cannot recover this stateid now, so
4843                                  * skip it and allow recovery thread to
4844                                  * proceed.
4845                                  */
4846                                 err = 0;
4847                                 goto out;
4848                         case -ENOMEM:
4849                         case -NFS4ERR_DENIED:
4850                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4851                                 err = 0;
4852                                 goto out;
4853                         case -NFS4ERR_DELAY:
4854                                 break;
4855                 }
4856                 err = nfs4_handle_exception(server, err, &exception);
4857         } while (exception.retry);
4858 out:
4859         return err;
4860 }
4861
4862 struct nfs_release_lockowner_data {
4863         struct nfs4_lock_state *lsp;
4864         struct nfs_server *server;
4865         struct nfs_release_lockowner_args args;
4866 };
4867
4868 static void nfs4_release_lockowner_release(void *calldata)
4869 {
4870         struct nfs_release_lockowner_data *data = calldata;
4871         nfs4_free_lock_state(data->server, data->lsp);
4872         kfree(calldata);
4873 }
4874
4875 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4876         .rpc_release = nfs4_release_lockowner_release,
4877 };
4878
4879 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4880 {
4881         struct nfs_server *server = lsp->ls_state->owner->so_server;
4882         struct nfs_release_lockowner_data *data;
4883         struct rpc_message msg = {
4884                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4885         };
4886
4887         if (server->nfs_client->cl_mvops->minor_version != 0)
4888                 return -EINVAL;
4889         data = kmalloc(sizeof(*data), GFP_NOFS);
4890         if (!data)
4891                 return -ENOMEM;
4892         data->lsp = lsp;
4893         data->server = server;
4894         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4895         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4896         data->args.lock_owner.s_dev = server->s_dev;
4897         msg.rpc_argp = &data->args;
4898         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4899         return 0;
4900 }
4901
4902 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4903
4904 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4905                                    const void *buf, size_t buflen,
4906                                    int flags, int type)
4907 {
4908         if (strcmp(key, "") != 0)
4909                 return -EINVAL;
4910
4911         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4912 }
4913
4914 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4915                                    void *buf, size_t buflen, int type)
4916 {
4917         if (strcmp(key, "") != 0)
4918                 return -EINVAL;
4919
4920         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4921 }
4922
4923 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4924                                        size_t list_len, const char *name,
4925                                        size_t name_len, int type)
4926 {
4927         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4928
4929         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4930                 return 0;
4931
4932         if (list && len <= list_len)
4933                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4934         return len;
4935 }
4936
4937 /*
4938  * nfs_fhget will use either the mounted_on_fileid or the fileid
4939  */
4940 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4941 {
4942         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4943                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4944               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4945               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4946                 return;
4947
4948         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4949                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4950         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4951         fattr->nlink = 2;
4952 }
4953
4954 static int _nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4955                 struct nfs4_fs_locations *fs_locations, struct page *page)
4956 {
4957         struct nfs_server *server = NFS_SERVER(dir);
4958         u32 bitmask[2] = {
4959                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4960         };
4961         struct nfs4_fs_locations_arg args = {
4962                 .dir_fh = NFS_FH(dir),
4963                 .name = name,
4964                 .page = page,
4965                 .bitmask = bitmask,
4966         };
4967         struct nfs4_fs_locations_res res = {
4968                 .fs_locations = fs_locations,
4969         };
4970         struct rpc_message msg = {
4971                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4972                 .rpc_argp = &args,
4973                 .rpc_resp = &res,
4974         };
4975         int status;
4976
4977         dprintk("%s: start\n", __func__);
4978
4979         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4980          * is not supported */
4981         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4982                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4983         else
4984                 bitmask[0] |= FATTR4_WORD0_FILEID;
4985
4986         nfs_fattr_init(&fs_locations->fattr);
4987         fs_locations->server = server;
4988         fs_locations->nlocations = 0;
4989         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4990         dprintk("%s: returned status = %d\n", __func__, status);
4991         return status;
4992 }
4993
4994 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4995                 struct nfs4_fs_locations *fs_locations, struct page *page)
4996 {
4997         struct nfs4_exception exception = { };
4998         int err;
4999         do {
5000                 err = nfs4_handle_exception(NFS_SERVER(dir),
5001                                 _nfs4_proc_fs_locations(dir, name, fs_locations, page),
5002                                 &exception);
5003         } while (exception.retry);
5004         return err;
5005 }
5006
5007 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5008 {
5009         int status;
5010         struct nfs4_secinfo_arg args = {
5011                 .dir_fh = NFS_FH(dir),
5012                 .name   = name,
5013         };
5014         struct nfs4_secinfo_res res = {
5015                 .flavors     = flavors,
5016         };
5017         struct rpc_message msg = {
5018                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5019                 .rpc_argp = &args,
5020                 .rpc_resp = &res,
5021         };
5022
5023         dprintk("NFS call  secinfo %s\n", name->name);
5024         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5025         dprintk("NFS reply  secinfo: %d\n", status);
5026         return status;
5027 }
5028
5029 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5030                       struct nfs4_secinfo_flavors *flavors)
5031 {
5032         struct nfs4_exception exception = { };
5033         int err;
5034         do {
5035                 err = nfs4_handle_exception(NFS_SERVER(dir),
5036                                 _nfs4_proc_secinfo(dir, name, flavors),
5037                                 &exception);
5038         } while (exception.retry);
5039         return err;
5040 }
5041
5042 #ifdef CONFIG_NFS_V4_1
5043 /*
5044  * Check the exchange flags returned by the server for invalid flags, having
5045  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5046  * DS flags set.
5047  */
5048 static int nfs4_check_cl_exchange_flags(u32 flags)
5049 {
5050         if (flags & ~EXCHGID4_FLAG_MASK_R)
5051                 goto out_inval;
5052         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5053             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5054                 goto out_inval;
5055         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5056                 goto out_inval;
5057         return NFS_OK;
5058 out_inval:
5059         return -NFS4ERR_INVAL;
5060 }
5061
5062 static bool
5063 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
5064 {
5065         if (a->server_scope_sz == b->server_scope_sz &&
5066             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5067                 return true;
5068
5069         return false;
5070 }
5071
5072 /*
5073  * nfs4_proc_exchange_id()
5074  *
5075  * Since the clientid has expired, all compounds using sessions
5076  * associated with the stale clientid will be returning
5077  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5078  * be in some phase of session reset.
5079  */
5080 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5081 {
5082         nfs4_verifier verifier;
5083         struct nfs41_exchange_id_args args = {
5084                 .verifier = &verifier,
5085                 .client = clp,
5086                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5087         };
5088         struct nfs41_exchange_id_res res = {
5089                 .client = clp,
5090         };
5091         int status;
5092         struct rpc_message msg = {
5093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5094                 .rpc_argp = &args,
5095                 .rpc_resp = &res,
5096                 .rpc_cred = cred,
5097         };
5098
5099         dprintk("--> %s\n", __func__);
5100         BUG_ON(clp == NULL);
5101
5102         nfs4_construct_boot_verifier(clp, &verifier);
5103
5104         args.id_len = scnprintf(args.id, sizeof(args.id),
5105                                 "%s/%s.%s/%u",
5106                                 clp->cl_ipaddr,
5107                                 init_utsname()->nodename,
5108                                 init_utsname()->domainname,
5109                                 clp->cl_rpcclient->cl_auth->au_flavor);
5110
5111         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
5112         if (unlikely(!res.server_scope)) {
5113                 status = -ENOMEM;
5114                 goto out;
5115         }
5116
5117         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5118         if (unlikely(!res.impl_id)) {
5119                 status = -ENOMEM;
5120                 goto out_server_scope;
5121         }
5122
5123         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5124         if (!status)
5125                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5126
5127         if (!status) {
5128                 /* use the most recent implementation id */
5129                 kfree(clp->impl_id);
5130                 clp->impl_id = res.impl_id;
5131         } else
5132                 kfree(res.impl_id);
5133
5134         if (!status) {
5135                 if (clp->server_scope &&
5136                     !nfs41_same_server_scope(clp->server_scope,
5137                                              res.server_scope)) {
5138                         dprintk("%s: server_scope mismatch detected\n",
5139                                 __func__);
5140                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5141                         kfree(clp->server_scope);
5142                         clp->server_scope = NULL;
5143                 }
5144
5145                 if (!clp->server_scope) {
5146                         clp->server_scope = res.server_scope;
5147                         goto out;
5148                 }
5149         }
5150
5151 out_server_scope:
5152         kfree(res.server_scope);
5153 out:
5154         if (clp->impl_id)
5155                 dprintk("%s: Server Implementation ID: "
5156                         "domain: %s, name: %s, date: %llu,%u\n",
5157                         __func__, clp->impl_id->domain, clp->impl_id->name,
5158                         clp->impl_id->date.seconds,
5159                         clp->impl_id->date.nseconds);
5160         dprintk("<-- %s status= %d\n", __func__, status);
5161         return status;
5162 }
5163
5164 struct nfs4_get_lease_time_data {
5165         struct nfs4_get_lease_time_args *args;
5166         struct nfs4_get_lease_time_res *res;
5167         struct nfs_client *clp;
5168 };
5169
5170 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5171                                         void *calldata)
5172 {
5173         int ret;
5174         struct nfs4_get_lease_time_data *data =
5175                         (struct nfs4_get_lease_time_data *)calldata;
5176
5177         dprintk("--> %s\n", __func__);
5178         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5179         /* just setup sequence, do not trigger session recovery
5180            since we're invoked within one */
5181         ret = nfs41_setup_sequence(data->clp->cl_session,
5182                                    &data->args->la_seq_args,
5183                                    &data->res->lr_seq_res, task);
5184
5185         BUG_ON(ret == -EAGAIN);
5186         rpc_call_start(task);
5187         dprintk("<-- %s\n", __func__);
5188 }
5189
5190 /*
5191  * Called from nfs4_state_manager thread for session setup, so don't recover
5192  * from sequence operation or clientid errors.
5193  */
5194 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5195 {
5196         struct nfs4_get_lease_time_data *data =
5197                         (struct nfs4_get_lease_time_data *)calldata;
5198
5199         dprintk("--> %s\n", __func__);
5200         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5201                 return;
5202         switch (task->tk_status) {
5203         case -NFS4ERR_DELAY:
5204         case -NFS4ERR_GRACE:
5205                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5206                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5207                 task->tk_status = 0;
5208                 /* fall through */
5209         case -NFS4ERR_RETRY_UNCACHED_REP:
5210                 rpc_restart_call_prepare(task);
5211                 return;
5212         }
5213         dprintk("<-- %s\n", __func__);
5214 }
5215
5216 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5217         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5218         .rpc_call_done = nfs4_get_lease_time_done,
5219 };
5220
5221 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5222 {
5223         struct rpc_task *task;
5224         struct nfs4_get_lease_time_args args;
5225         struct nfs4_get_lease_time_res res = {
5226                 .lr_fsinfo = fsinfo,
5227         };
5228         struct nfs4_get_lease_time_data data = {
5229                 .args = &args,
5230                 .res = &res,
5231                 .clp = clp,
5232         };
5233         struct rpc_message msg = {
5234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5235                 .rpc_argp = &args,
5236                 .rpc_resp = &res,
5237         };
5238         struct rpc_task_setup task_setup = {
5239                 .rpc_client = clp->cl_rpcclient,
5240                 .rpc_message = &msg,
5241                 .callback_ops = &nfs4_get_lease_time_ops,
5242                 .callback_data = &data,
5243                 .flags = RPC_TASK_TIMEOUT,
5244         };
5245         int status;
5246
5247         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5248         dprintk("--> %s\n", __func__);
5249         task = rpc_run_task(&task_setup);
5250
5251         if (IS_ERR(task))
5252                 status = PTR_ERR(task);
5253         else {
5254                 status = task->tk_status;
5255                 rpc_put_task(task);
5256         }
5257         dprintk("<-- %s return %d\n", __func__, status);
5258
5259         return status;
5260 }
5261
5262 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5263 {
5264         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5265 }
5266
5267 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5268                 struct nfs4_slot *new,
5269                 u32 max_slots,
5270                 u32 ivalue)
5271 {
5272         struct nfs4_slot *old = NULL;
5273         u32 i;
5274
5275         spin_lock(&tbl->slot_tbl_lock);
5276         if (new) {
5277                 old = tbl->slots;
5278                 tbl->slots = new;
5279                 tbl->max_slots = max_slots;
5280         }
5281         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5282         for (i = 0; i < tbl->max_slots; i++)
5283                 tbl->slots[i].seq_nr = ivalue;
5284         spin_unlock(&tbl->slot_tbl_lock);
5285         kfree(old);
5286 }
5287
5288 /*
5289  * (re)Initialise a slot table
5290  */
5291 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5292                                  u32 ivalue)
5293 {
5294         struct nfs4_slot *new = NULL;
5295         int ret = -ENOMEM;
5296
5297         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5298                 max_reqs, tbl->max_slots);
5299
5300         /* Does the newly negotiated max_reqs match the existing slot table? */
5301         if (max_reqs != tbl->max_slots) {
5302                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5303                 if (!new)
5304                         goto out;
5305         }
5306         ret = 0;
5307
5308         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5309         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5310                 tbl, tbl->slots, tbl->max_slots);
5311 out:
5312         dprintk("<-- %s: return %d\n", __func__, ret);
5313         return ret;
5314 }
5315
5316 /* Destroy the slot table */
5317 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5318 {
5319         if (session->fc_slot_table.slots != NULL) {
5320                 kfree(session->fc_slot_table.slots);
5321                 session->fc_slot_table.slots = NULL;
5322         }
5323         if (session->bc_slot_table.slots != NULL) {
5324                 kfree(session->bc_slot_table.slots);
5325                 session->bc_slot_table.slots = NULL;
5326         }
5327         return;
5328 }
5329
5330 /*
5331  * Initialize or reset the forechannel and backchannel tables
5332  */
5333 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5334 {
5335         struct nfs4_slot_table *tbl;
5336         int status;
5337
5338         dprintk("--> %s\n", __func__);
5339         /* Fore channel */
5340         tbl = &ses->fc_slot_table;
5341         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5342         if (status) /* -ENOMEM */
5343                 return status;
5344         /* Back channel */
5345         tbl = &ses->bc_slot_table;
5346         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5347         if (status && tbl->slots == NULL)
5348                 /* Fore and back channel share a connection so get
5349                  * both slot tables or neither */
5350                 nfs4_destroy_slot_tables(ses);
5351         return status;
5352 }
5353
5354 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5355 {
5356         struct nfs4_session *session;
5357         struct nfs4_slot_table *tbl;
5358
5359         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5360         if (!session)
5361                 return NULL;
5362
5363         tbl = &session->fc_slot_table;
5364         tbl->highest_used_slotid = NFS4_NO_SLOT;
5365         spin_lock_init(&tbl->slot_tbl_lock);
5366         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5367         init_completion(&tbl->complete);
5368
5369         tbl = &session->bc_slot_table;
5370         tbl->highest_used_slotid = NFS4_NO_SLOT;
5371         spin_lock_init(&tbl->slot_tbl_lock);
5372         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5373         init_completion(&tbl->complete);
5374
5375         session->session_state = 1<<NFS4_SESSION_INITING;
5376
5377         session->clp = clp;
5378         return session;
5379 }
5380
5381 void nfs4_destroy_session(struct nfs4_session *session)
5382 {
5383         struct rpc_xprt *xprt;
5384
5385         nfs4_proc_destroy_session(session);
5386
5387         rcu_read_lock();
5388         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5389         rcu_read_unlock();
5390         dprintk("%s Destroy backchannel for xprt %p\n",
5391                 __func__, xprt);
5392         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5393         nfs4_destroy_slot_tables(session);
5394         kfree(session);
5395 }
5396
5397 /*
5398  * Initialize the values to be used by the client in CREATE_SESSION
5399  * If nfs4_init_session set the fore channel request and response sizes,
5400  * use them.
5401  *
5402  * Set the back channel max_resp_sz_cached to zero to force the client to
5403  * always set csa_cachethis to FALSE because the current implementation
5404  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5405  */
5406 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5407 {
5408         struct nfs4_session *session = args->client->cl_session;
5409         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5410                      mxresp_sz = session->fc_attrs.max_resp_sz;
5411
5412         if (mxrqst_sz == 0)
5413                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5414         if (mxresp_sz == 0)
5415                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5416         /* Fore channel attributes */
5417         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5418         args->fc_attrs.max_resp_sz = mxresp_sz;
5419         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5420         args->fc_attrs.max_reqs = max_session_slots;
5421
5422         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5423                 "max_ops=%u max_reqs=%u\n",
5424                 __func__,
5425                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5426                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5427
5428         /* Back channel attributes */
5429         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5430         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5431         args->bc_attrs.max_resp_sz_cached = 0;
5432         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5433         args->bc_attrs.max_reqs = 1;
5434
5435         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5436                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5437                 __func__,
5438                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5439                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5440                 args->bc_attrs.max_reqs);
5441 }
5442
5443 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5444 {
5445         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5446         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5447
5448         if (rcvd->max_resp_sz > sent->max_resp_sz)
5449                 return -EINVAL;
5450         /*
5451          * Our requested max_ops is the minimum we need; we're not
5452          * prepared to break up compounds into smaller pieces than that.
5453          * So, no point even trying to continue if the server won't
5454          * cooperate:
5455          */
5456         if (rcvd->max_ops < sent->max_ops)
5457                 return -EINVAL;
5458         if (rcvd->max_reqs == 0)
5459                 return -EINVAL;
5460         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5461                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5462         return 0;
5463 }
5464
5465 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5466 {
5467         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5468         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5469
5470         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5471                 return -EINVAL;
5472         if (rcvd->max_resp_sz < sent->max_resp_sz)
5473                 return -EINVAL;
5474         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5475                 return -EINVAL;
5476         /* These would render the backchannel useless: */
5477         if (rcvd->max_ops != sent->max_ops)
5478                 return -EINVAL;
5479         if (rcvd->max_reqs != sent->max_reqs)
5480                 return -EINVAL;
5481         return 0;
5482 }
5483
5484 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5485                                      struct nfs4_session *session)
5486 {
5487         int ret;
5488
5489         ret = nfs4_verify_fore_channel_attrs(args, session);
5490         if (ret)
5491                 return ret;
5492         return nfs4_verify_back_channel_attrs(args, session);
5493 }
5494
5495 static int _nfs4_proc_create_session(struct nfs_client *clp)
5496 {
5497         struct nfs4_session *session = clp->cl_session;
5498         struct nfs41_create_session_args args = {
5499                 .client = clp,
5500                 .cb_program = NFS4_CALLBACK,
5501         };
5502         struct nfs41_create_session_res res = {
5503                 .client = clp,
5504         };
5505         struct rpc_message msg = {
5506                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5507                 .rpc_argp = &args,
5508                 .rpc_resp = &res,
5509         };
5510         int status;
5511
5512         nfs4_init_channel_attrs(&args);
5513         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5514
5515         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5516
5517         if (!status)
5518                 /* Verify the session's negotiated channel_attrs values */
5519                 status = nfs4_verify_channel_attrs(&args, session);
5520         if (!status) {
5521                 /* Increment the clientid slot sequence id */
5522                 clp->cl_seqid++;
5523         }
5524
5525         return status;
5526 }
5527
5528 /*
5529  * Issues a CREATE_SESSION operation to the server.
5530  * It is the responsibility of the caller to verify the session is
5531  * expired before calling this routine.
5532  */
5533 int nfs4_proc_create_session(struct nfs_client *clp)
5534 {
5535         int status;
5536         unsigned *ptr;
5537         struct nfs4_session *session = clp->cl_session;
5538
5539         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5540
5541         status = _nfs4_proc_create_session(clp);
5542         if (status)
5543                 goto out;
5544
5545         /* Init or reset the session slot tables */
5546         status = nfs4_setup_session_slot_tables(session);
5547         dprintk("slot table setup returned %d\n", status);
5548         if (status)
5549                 goto out;
5550
5551         ptr = (unsigned *)&session->sess_id.data[0];
5552         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5553                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5554 out:
5555         dprintk("<-- %s\n", __func__);
5556         return status;
5557 }
5558
5559 /*
5560  * Issue the over-the-wire RPC DESTROY_SESSION.
5561  * The caller must serialize access to this routine.
5562  */
5563 int nfs4_proc_destroy_session(struct nfs4_session *session)
5564 {
5565         int status = 0;
5566         struct rpc_message msg;
5567
5568         dprintk("--> nfs4_proc_destroy_session\n");
5569
5570         /* session is still being setup */
5571         if (session->clp->cl_cons_state != NFS_CS_READY)
5572                 return status;
5573
5574         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5575         msg.rpc_argp = session;
5576         msg.rpc_resp = NULL;
5577         msg.rpc_cred = NULL;
5578         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5579
5580         if (status)
5581                 printk(KERN_WARNING
5582                         "NFS: Got error %d from the server on DESTROY_SESSION. "
5583                         "Session has been destroyed regardless...\n", status);
5584
5585         dprintk("<-- nfs4_proc_destroy_session\n");
5586         return status;
5587 }
5588
5589 int nfs4_init_session(struct nfs_server *server)
5590 {
5591         struct nfs_client *clp = server->nfs_client;
5592         struct nfs4_session *session;
5593         unsigned int rsize, wsize;
5594         int ret;
5595
5596         if (!nfs4_has_session(clp))
5597                 return 0;
5598
5599         session = clp->cl_session;
5600         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5601                 return 0;
5602
5603         rsize = server->rsize;
5604         if (rsize == 0)
5605                 rsize = NFS_MAX_FILE_IO_SIZE;
5606         wsize = server->wsize;
5607         if (wsize == 0)
5608                 wsize = NFS_MAX_FILE_IO_SIZE;
5609
5610         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5611         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5612
5613         ret = nfs4_recover_expired_lease(server);
5614         if (!ret)
5615                 ret = nfs4_check_client_ready(clp);
5616         return ret;
5617 }
5618
5619 int nfs4_init_ds_session(struct nfs_client *clp)
5620 {
5621         struct nfs4_session *session = clp->cl_session;
5622         int ret;
5623
5624         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5625                 return 0;
5626
5627         ret = nfs4_client_recover_expired_lease(clp);
5628         if (!ret)
5629                 /* Test for the DS role */
5630                 if (!is_ds_client(clp))
5631                         ret = -ENODEV;
5632         if (!ret)
5633                 ret = nfs4_check_client_ready(clp);
5634         return ret;
5635
5636 }
5637 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5638
5639
5640 /*
5641  * Renew the cl_session lease.
5642  */
5643 struct nfs4_sequence_data {
5644         struct nfs_client *clp;
5645         struct nfs4_sequence_args args;
5646         struct nfs4_sequence_res res;
5647 };
5648
5649 static void nfs41_sequence_release(void *data)
5650 {
5651         struct nfs4_sequence_data *calldata = data;
5652         struct nfs_client *clp = calldata->clp;
5653
5654         if (atomic_read(&clp->cl_count) > 1)
5655                 nfs4_schedule_state_renewal(clp);
5656         nfs_put_client(clp);
5657         kfree(calldata);
5658 }
5659
5660 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5661 {
5662         switch(task->tk_status) {
5663         case -NFS4ERR_DELAY:
5664                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5665                 return -EAGAIN;
5666         default:
5667                 nfs4_schedule_lease_recovery(clp);
5668         }
5669         return 0;
5670 }
5671
5672 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5673 {
5674         struct nfs4_sequence_data *calldata = data;
5675         struct nfs_client *clp = calldata->clp;
5676
5677         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5678                 return;
5679
5680         if (task->tk_status < 0) {
5681                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5682                 if (atomic_read(&clp->cl_count) == 1)
5683                         goto out;
5684
5685                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5686                         rpc_restart_call_prepare(task);
5687                         return;
5688                 }
5689         }
5690         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5691 out:
5692         dprintk("<-- %s\n", __func__);
5693 }
5694
5695 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5696 {
5697         struct nfs4_sequence_data *calldata = data;
5698         struct nfs_client *clp = calldata->clp;
5699         struct nfs4_sequence_args *args;
5700         struct nfs4_sequence_res *res;
5701
5702         args = task->tk_msg.rpc_argp;
5703         res = task->tk_msg.rpc_resp;
5704
5705         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5706                 return;
5707         rpc_call_start(task);
5708 }
5709
5710 static const struct rpc_call_ops nfs41_sequence_ops = {
5711         .rpc_call_done = nfs41_sequence_call_done,
5712         .rpc_call_prepare = nfs41_sequence_prepare,
5713         .rpc_release = nfs41_sequence_release,
5714 };
5715
5716 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5717 {
5718         struct nfs4_sequence_data *calldata;
5719         struct rpc_message msg = {
5720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5721                 .rpc_cred = cred,
5722         };
5723         struct rpc_task_setup task_setup_data = {
5724                 .rpc_client = clp->cl_rpcclient,
5725                 .rpc_message = &msg,
5726                 .callback_ops = &nfs41_sequence_ops,
5727                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5728         };
5729
5730         if (!atomic_inc_not_zero(&clp->cl_count))
5731                 return ERR_PTR(-EIO);
5732         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5733         if (calldata == NULL) {
5734                 nfs_put_client(clp);
5735                 return ERR_PTR(-ENOMEM);
5736         }
5737         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5738         msg.rpc_argp = &calldata->args;
5739         msg.rpc_resp = &calldata->res;
5740         calldata->clp = clp;
5741         task_setup_data.callback_data = calldata;
5742
5743         return rpc_run_task(&task_setup_data);
5744 }
5745
5746 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5747 {
5748         struct rpc_task *task;
5749         int ret = 0;
5750
5751         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5752                 return 0;
5753         task = _nfs41_proc_sequence(clp, cred);
5754         if (IS_ERR(task))
5755                 ret = PTR_ERR(task);
5756         else
5757                 rpc_put_task_async(task);
5758         dprintk("<-- %s status=%d\n", __func__, ret);
5759         return ret;
5760 }
5761
5762 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5763 {
5764         struct rpc_task *task;
5765         int ret;
5766
5767         task = _nfs41_proc_sequence(clp, cred);
5768         if (IS_ERR(task)) {
5769                 ret = PTR_ERR(task);
5770                 goto out;
5771         }
5772         ret = rpc_wait_for_completion_task(task);
5773         if (!ret) {
5774                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5775
5776                 if (task->tk_status == 0)
5777                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5778                 ret = task->tk_status;
5779         }
5780         rpc_put_task(task);
5781 out:
5782         dprintk("<-- %s status=%d\n", __func__, ret);
5783         return ret;
5784 }
5785
5786 struct nfs4_reclaim_complete_data {
5787         struct nfs_client *clp;
5788         struct nfs41_reclaim_complete_args arg;
5789         struct nfs41_reclaim_complete_res res;
5790 };
5791
5792 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5793 {
5794         struct nfs4_reclaim_complete_data *calldata = data;
5795
5796         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5797         if (nfs41_setup_sequence(calldata->clp->cl_session,
5798                                 &calldata->arg.seq_args,
5799                                 &calldata->res.seq_res, task))
5800                 return;
5801
5802         rpc_call_start(task);
5803 }
5804
5805 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5806 {
5807         switch(task->tk_status) {
5808         case 0:
5809         case -NFS4ERR_COMPLETE_ALREADY:
5810         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5811                 break;
5812         case -NFS4ERR_DELAY:
5813                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5814                 /* fall through */
5815         case -NFS4ERR_RETRY_UNCACHED_REP:
5816                 return -EAGAIN;
5817         default:
5818                 nfs4_schedule_lease_recovery(clp);
5819         }
5820         return 0;
5821 }
5822
5823 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5824 {
5825         struct nfs4_reclaim_complete_data *calldata = data;
5826         struct nfs_client *clp = calldata->clp;
5827         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5828
5829         dprintk("--> %s\n", __func__);
5830         if (!nfs41_sequence_done(task, res))
5831                 return;
5832
5833         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5834                 rpc_restart_call_prepare(task);
5835                 return;
5836         }
5837         dprintk("<-- %s\n", __func__);
5838 }
5839
5840 static void nfs4_free_reclaim_complete_data(void *data)
5841 {
5842         struct nfs4_reclaim_complete_data *calldata = data;
5843
5844         kfree(calldata);
5845 }
5846
5847 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5848         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5849         .rpc_call_done = nfs4_reclaim_complete_done,
5850         .rpc_release = nfs4_free_reclaim_complete_data,
5851 };
5852
5853 /*
5854  * Issue a global reclaim complete.
5855  */
5856 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5857 {
5858         struct nfs4_reclaim_complete_data *calldata;
5859         struct rpc_task *task;
5860         struct rpc_message msg = {
5861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5862         };
5863         struct rpc_task_setup task_setup_data = {
5864                 .rpc_client = clp->cl_rpcclient,
5865                 .rpc_message = &msg,
5866                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5867                 .flags = RPC_TASK_ASYNC,
5868         };
5869         int status = -ENOMEM;
5870
5871         dprintk("--> %s\n", __func__);
5872         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5873         if (calldata == NULL)
5874                 goto out;
5875         calldata->clp = clp;
5876         calldata->arg.one_fs = 0;
5877
5878         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5879         msg.rpc_argp = &calldata->arg;
5880         msg.rpc_resp = &calldata->res;
5881         task_setup_data.callback_data = calldata;
5882         task = rpc_run_task(&task_setup_data);
5883         if (IS_ERR(task)) {
5884                 status = PTR_ERR(task);
5885                 goto out;
5886         }
5887         status = nfs4_wait_for_completion_rpc_task(task);
5888         if (status == 0)
5889                 status = task->tk_status;
5890         rpc_put_task(task);
5891         return 0;
5892 out:
5893         dprintk("<-- %s status=%d\n", __func__, status);
5894         return status;
5895 }
5896
5897 static void
5898 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5899 {
5900         struct nfs4_layoutget *lgp = calldata;
5901         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5902
5903         dprintk("--> %s\n", __func__);
5904         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5905          * right now covering the LAYOUTGET we are about to send.
5906          * However, that is not so catastrophic, and there seems
5907          * to be no way to prevent it completely.
5908          */
5909         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5910                                 &lgp->res.seq_res, task))
5911                 return;
5912         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5913                                           NFS_I(lgp->args.inode)->layout,
5914                                           lgp->args.ctx->state)) {
5915                 rpc_exit(task, NFS4_OK);
5916                 return;
5917         }
5918         rpc_call_start(task);
5919 }
5920
5921 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5922 {
5923         struct nfs4_layoutget *lgp = calldata;
5924         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5925
5926         dprintk("--> %s\n", __func__);
5927
5928         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5929                 return;
5930
5931         switch (task->tk_status) {
5932         case 0:
5933                 break;
5934         case -NFS4ERR_LAYOUTTRYLATER:
5935         case -NFS4ERR_RECALLCONFLICT:
5936                 task->tk_status = -NFS4ERR_DELAY;
5937                 /* Fall through */
5938         default:
5939                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5940                         rpc_restart_call_prepare(task);
5941                         return;
5942                 }
5943         }
5944         dprintk("<-- %s\n", __func__);
5945 }
5946
5947 static void nfs4_layoutget_release(void *calldata)
5948 {
5949         struct nfs4_layoutget *lgp = calldata;
5950
5951         dprintk("--> %s\n", __func__);
5952         put_nfs_open_context(lgp->args.ctx);
5953         kfree(calldata);
5954         dprintk("<-- %s\n", __func__);
5955 }
5956
5957 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5958         .rpc_call_prepare = nfs4_layoutget_prepare,
5959         .rpc_call_done = nfs4_layoutget_done,
5960         .rpc_release = nfs4_layoutget_release,
5961 };
5962
5963 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5964 {
5965         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5966         struct rpc_task *task;
5967         struct rpc_message msg = {
5968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5969                 .rpc_argp = &lgp->args,
5970                 .rpc_resp = &lgp->res,
5971         };
5972         struct rpc_task_setup task_setup_data = {
5973                 .rpc_client = server->client,
5974                 .rpc_message = &msg,
5975                 .callback_ops = &nfs4_layoutget_call_ops,
5976                 .callback_data = lgp,
5977                 .flags = RPC_TASK_ASYNC,
5978         };
5979         int status = 0;
5980
5981         dprintk("--> %s\n", __func__);
5982
5983         lgp->res.layoutp = &lgp->args.layout;
5984         lgp->res.seq_res.sr_slot = NULL;
5985         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
5986         task = rpc_run_task(&task_setup_data);
5987         if (IS_ERR(task))
5988                 return PTR_ERR(task);
5989         status = nfs4_wait_for_completion_rpc_task(task);
5990         if (status == 0)
5991                 status = task->tk_status;
5992         if (status == 0)
5993                 status = pnfs_layout_process(lgp);
5994         rpc_put_task(task);
5995         dprintk("<-- %s status=%d\n", __func__, status);
5996         return status;
5997 }
5998
5999 static void
6000 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6001 {
6002         struct nfs4_layoutreturn *lrp = calldata;
6003
6004         dprintk("--> %s\n", __func__);
6005         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6006                                 &lrp->res.seq_res, task))
6007                 return;
6008         rpc_call_start(task);
6009 }
6010
6011 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6012 {
6013         struct nfs4_layoutreturn *lrp = calldata;
6014         struct nfs_server *server;
6015         struct pnfs_layout_hdr *lo = lrp->args.layout;
6016
6017         dprintk("--> %s\n", __func__);
6018
6019         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6020                 return;
6021
6022         server = NFS_SERVER(lrp->args.inode);
6023         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6024                 rpc_restart_call_prepare(task);
6025                 return;
6026         }
6027         spin_lock(&lo->plh_inode->i_lock);
6028         if (task->tk_status == 0) {
6029                 if (lrp->res.lrs_present) {
6030                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6031                 } else
6032                         BUG_ON(!list_empty(&lo->plh_segs));
6033         }
6034         lo->plh_block_lgets--;
6035         spin_unlock(&lo->plh_inode->i_lock);
6036         dprintk("<-- %s\n", __func__);
6037 }
6038
6039 static void nfs4_layoutreturn_release(void *calldata)
6040 {
6041         struct nfs4_layoutreturn *lrp = calldata;
6042
6043         dprintk("--> %s\n", __func__);
6044         put_layout_hdr(lrp->args.layout);
6045         kfree(calldata);
6046         dprintk("<-- %s\n", __func__);
6047 }
6048
6049 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6050         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6051         .rpc_call_done = nfs4_layoutreturn_done,
6052         .rpc_release = nfs4_layoutreturn_release,
6053 };
6054
6055 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6056 {
6057         struct rpc_task *task;
6058         struct rpc_message msg = {
6059                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6060                 .rpc_argp = &lrp->args,
6061                 .rpc_resp = &lrp->res,
6062         };
6063         struct rpc_task_setup task_setup_data = {
6064                 .rpc_client = lrp->clp->cl_rpcclient,
6065                 .rpc_message = &msg,
6066                 .callback_ops = &nfs4_layoutreturn_call_ops,
6067                 .callback_data = lrp,
6068         };
6069         int status;
6070
6071         dprintk("--> %s\n", __func__);
6072         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6073         task = rpc_run_task(&task_setup_data);
6074         if (IS_ERR(task))
6075                 return PTR_ERR(task);
6076         status = task->tk_status;
6077         dprintk("<-- %s status=%d\n", __func__, status);
6078         rpc_put_task(task);
6079         return status;
6080 }
6081
6082 /*
6083  * Retrieve the list of Data Server devices from the MDS.
6084  */
6085 static int _nfs4_getdevicelist(struct nfs_server *server,
6086                                     const struct nfs_fh *fh,
6087                                     struct pnfs_devicelist *devlist)
6088 {
6089         struct nfs4_getdevicelist_args args = {
6090                 .fh = fh,
6091                 .layoutclass = server->pnfs_curr_ld->id,
6092         };
6093         struct nfs4_getdevicelist_res res = {
6094                 .devlist = devlist,
6095         };
6096         struct rpc_message msg = {
6097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6098                 .rpc_argp = &args,
6099                 .rpc_resp = &res,
6100         };
6101         int status;
6102
6103         dprintk("--> %s\n", __func__);
6104         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6105                                 &res.seq_res, 0);
6106         dprintk("<-- %s status=%d\n", __func__, status);
6107         return status;
6108 }
6109
6110 int nfs4_proc_getdevicelist(struct nfs_server *server,
6111                             const struct nfs_fh *fh,
6112                             struct pnfs_devicelist *devlist)
6113 {
6114         struct nfs4_exception exception = { };
6115         int err;
6116
6117         do {
6118                 err = nfs4_handle_exception(server,
6119                                 _nfs4_getdevicelist(server, fh, devlist),
6120                                 &exception);
6121         } while (exception.retry);
6122
6123         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6124                 err, devlist->num_devs);
6125
6126         return err;
6127 }
6128 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6129
6130 static int
6131 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6132 {
6133         struct nfs4_getdeviceinfo_args args = {
6134                 .pdev = pdev,
6135         };
6136         struct nfs4_getdeviceinfo_res res = {
6137                 .pdev = pdev,
6138         };
6139         struct rpc_message msg = {
6140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6141                 .rpc_argp = &args,
6142                 .rpc_resp = &res,
6143         };
6144         int status;
6145
6146         dprintk("--> %s\n", __func__);
6147         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6148         dprintk("<-- %s status=%d\n", __func__, status);
6149
6150         return status;
6151 }
6152
6153 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6154 {
6155         struct nfs4_exception exception = { };
6156         int err;
6157
6158         do {
6159                 err = nfs4_handle_exception(server,
6160                                         _nfs4_proc_getdeviceinfo(server, pdev),
6161                                         &exception);
6162         } while (exception.retry);
6163         return err;
6164 }
6165 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6166
6167 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6168 {
6169         struct nfs4_layoutcommit_data *data = calldata;
6170         struct nfs_server *server = NFS_SERVER(data->args.inode);
6171
6172         if (nfs4_setup_sequence(server, &data->args.seq_args,
6173                                 &data->res.seq_res, task))
6174                 return;
6175         rpc_call_start(task);
6176 }
6177
6178 static void
6179 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6180 {
6181         struct nfs4_layoutcommit_data *data = calldata;
6182         struct nfs_server *server = NFS_SERVER(data->args.inode);
6183
6184         if (!nfs4_sequence_done(task, &data->res.seq_res))
6185                 return;
6186
6187         switch (task->tk_status) { /* Just ignore these failures */
6188         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6189         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6190         case -NFS4ERR_BADLAYOUT:     /* no layout */
6191         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6192                 task->tk_status = 0;
6193                 break;
6194         case 0:
6195                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6196                                                    data->res.fattr);
6197                 break;
6198         default:
6199                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6200                         rpc_restart_call_prepare(task);
6201                         return;
6202                 }
6203         }
6204 }
6205
6206 static void nfs4_layoutcommit_release(void *calldata)
6207 {
6208         struct nfs4_layoutcommit_data *data = calldata;
6209         struct pnfs_layout_segment *lseg, *tmp;
6210         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6211
6212         pnfs_cleanup_layoutcommit(data);
6213         /* Matched by references in pnfs_set_layoutcommit */
6214         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6215                 list_del_init(&lseg->pls_lc_list);
6216                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6217                                        &lseg->pls_flags))
6218                         put_lseg(lseg);
6219         }
6220
6221         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6222         smp_mb__after_clear_bit();
6223         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6224
6225         put_rpccred(data->cred);
6226         kfree(data);
6227 }
6228
6229 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6230         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6231         .rpc_call_done = nfs4_layoutcommit_done,
6232         .rpc_release = nfs4_layoutcommit_release,
6233 };
6234
6235 int
6236 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6237 {
6238         struct rpc_message msg = {
6239                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6240                 .rpc_argp = &data->args,
6241                 .rpc_resp = &data->res,
6242                 .rpc_cred = data->cred,
6243         };
6244         struct rpc_task_setup task_setup_data = {
6245                 .task = &data->task,
6246                 .rpc_client = NFS_CLIENT(data->args.inode),
6247                 .rpc_message = &msg,
6248                 .callback_ops = &nfs4_layoutcommit_ops,
6249                 .callback_data = data,
6250                 .flags = RPC_TASK_ASYNC,
6251         };
6252         struct rpc_task *task;
6253         int status = 0;
6254
6255         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6256                 "lbw: %llu inode %lu\n",
6257                 data->task.tk_pid, sync,
6258                 data->args.lastbytewritten,
6259                 data->args.inode->i_ino);
6260
6261         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6262         task = rpc_run_task(&task_setup_data);
6263         if (IS_ERR(task))
6264                 return PTR_ERR(task);
6265         if (sync == false)
6266                 goto out;
6267         status = nfs4_wait_for_completion_rpc_task(task);
6268         if (status != 0)
6269                 goto out;
6270         status = task->tk_status;
6271 out:
6272         dprintk("%s: status %d\n", __func__, status);
6273         rpc_put_task(task);
6274         return status;
6275 }
6276
6277 static int
6278 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6279                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6280 {
6281         struct nfs41_secinfo_no_name_args args = {
6282                 .style = SECINFO_STYLE_CURRENT_FH,
6283         };
6284         struct nfs4_secinfo_res res = {
6285                 .flavors = flavors,
6286         };
6287         struct rpc_message msg = {
6288                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6289                 .rpc_argp = &args,
6290                 .rpc_resp = &res,
6291         };
6292         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6293 }
6294
6295 static int
6296 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6297                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6298 {
6299         struct nfs4_exception exception = { };
6300         int err;
6301         do {
6302                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6303                 switch (err) {
6304                 case 0:
6305                 case -NFS4ERR_WRONGSEC:
6306                 case -NFS4ERR_NOTSUPP:
6307                         goto out;
6308                 default:
6309                         err = nfs4_handle_exception(server, err, &exception);
6310                 }
6311         } while (exception.retry);
6312 out:
6313         return err;
6314 }
6315
6316 static int
6317 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6318                     struct nfs_fsinfo *info)
6319 {
6320         int err;
6321         struct page *page;
6322         rpc_authflavor_t flavor;
6323         struct nfs4_secinfo_flavors *flavors;
6324
6325         page = alloc_page(GFP_KERNEL);
6326         if (!page) {
6327                 err = -ENOMEM;
6328                 goto out;
6329         }
6330
6331         flavors = page_address(page);
6332         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6333
6334         /*
6335          * Fall back on "guess and check" method if
6336          * the server doesn't support SECINFO_NO_NAME
6337          */
6338         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6339                 err = nfs4_find_root_sec(server, fhandle, info);
6340                 goto out_freepage;
6341         }
6342         if (err)
6343                 goto out_freepage;
6344
6345         flavor = nfs_find_best_sec(flavors);
6346         if (err == 0)
6347                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6348
6349 out_freepage:
6350         put_page(page);
6351         if (err == -EACCES)
6352                 return -EPERM;
6353 out:
6354         return err;
6355 }
6356
6357 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6358 {
6359         int status;
6360         struct nfs41_test_stateid_args args = {
6361                 .stateid = stateid,
6362         };
6363         struct nfs41_test_stateid_res res;
6364         struct rpc_message msg = {
6365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6366                 .rpc_argp = &args,
6367                 .rpc_resp = &res,
6368         };
6369
6370         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6371         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6372
6373         if (status == NFS_OK)
6374                 return res.status;
6375         return status;
6376 }
6377
6378 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6379 {
6380         struct nfs4_exception exception = { };
6381         int err;
6382         do {
6383                 err = nfs4_handle_exception(server,
6384                                 _nfs41_test_stateid(server, stateid),
6385                                 &exception);
6386         } while (exception.retry);
6387         return err;
6388 }
6389
6390 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6391 {
6392         struct nfs41_free_stateid_args args = {
6393                 .stateid = stateid,
6394         };
6395         struct nfs41_free_stateid_res res;
6396         struct rpc_message msg = {
6397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6398                 .rpc_argp = &args,
6399                 .rpc_resp = &res,
6400         };
6401
6402         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6403         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6404 }
6405
6406 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6407 {
6408         struct nfs4_exception exception = { };
6409         int err;
6410         do {
6411                 err = nfs4_handle_exception(server,
6412                                 _nfs4_free_stateid(server, stateid),
6413                                 &exception);
6414         } while (exception.retry);
6415         return err;
6416 }
6417
6418 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6419                 const nfs4_stateid *s2)
6420 {
6421         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6422                 return false;
6423
6424         if (s1->seqid == s2->seqid)
6425                 return true;
6426         if (s1->seqid == 0 || s2->seqid == 0)
6427                 return true;
6428
6429         return false;
6430 }
6431
6432 #endif /* CONFIG_NFS_V4_1 */
6433
6434 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6435                 const nfs4_stateid *s2)
6436 {
6437         return nfs4_stateid_match(s1, s2);
6438 }
6439
6440
6441 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6442         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6443         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6444         .recover_open   = nfs4_open_reclaim,
6445         .recover_lock   = nfs4_lock_reclaim,
6446         .establish_clid = nfs4_init_clientid,
6447         .get_clid_cred  = nfs4_get_setclientid_cred,
6448 };
6449
6450 #if defined(CONFIG_NFS_V4_1)
6451 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6452         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6453         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6454         .recover_open   = nfs4_open_reclaim,
6455         .recover_lock   = nfs4_lock_reclaim,
6456         .establish_clid = nfs41_init_clientid,
6457         .get_clid_cred  = nfs4_get_exchange_id_cred,
6458         .reclaim_complete = nfs41_proc_reclaim_complete,
6459 };
6460 #endif /* CONFIG_NFS_V4_1 */
6461
6462 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6463         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6464         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6465         .recover_open   = nfs4_open_expired,
6466         .recover_lock   = nfs4_lock_expired,
6467         .establish_clid = nfs4_init_clientid,
6468         .get_clid_cred  = nfs4_get_setclientid_cred,
6469 };
6470
6471 #if defined(CONFIG_NFS_V4_1)
6472 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6473         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6474         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6475         .recover_open   = nfs41_open_expired,
6476         .recover_lock   = nfs41_lock_expired,
6477         .establish_clid = nfs41_init_clientid,
6478         .get_clid_cred  = nfs4_get_exchange_id_cred,
6479 };
6480 #endif /* CONFIG_NFS_V4_1 */
6481
6482 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6483         .sched_state_renewal = nfs4_proc_async_renew,
6484         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6485         .renew_lease = nfs4_proc_renew,
6486 };
6487
6488 #if defined(CONFIG_NFS_V4_1)
6489 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6490         .sched_state_renewal = nfs41_proc_async_sequence,
6491         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6492         .renew_lease = nfs4_proc_sequence,
6493 };
6494 #endif
6495
6496 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6497         .minor_version = 0,
6498         .call_sync = _nfs4_call_sync,
6499         .match_stateid = nfs4_match_stateid,
6500         .find_root_sec = nfs4_find_root_sec,
6501         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6502         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6503         .state_renewal_ops = &nfs40_state_renewal_ops,
6504 };
6505
6506 #if defined(CONFIG_NFS_V4_1)
6507 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6508         .minor_version = 1,
6509         .call_sync = _nfs4_call_sync_session,
6510         .match_stateid = nfs41_match_stateid,
6511         .find_root_sec = nfs41_find_root_sec,
6512         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6513         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6514         .state_renewal_ops = &nfs41_state_renewal_ops,
6515 };
6516 #endif
6517
6518 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6519         [0] = &nfs_v4_0_minor_ops,
6520 #if defined(CONFIG_NFS_V4_1)
6521         [1] = &nfs_v4_1_minor_ops,
6522 #endif
6523 };
6524
6525 static const struct inode_operations nfs4_file_inode_operations = {
6526         .permission     = nfs_permission,
6527         .getattr        = nfs_getattr,
6528         .setattr        = nfs_setattr,
6529         .getxattr       = generic_getxattr,
6530         .setxattr       = generic_setxattr,
6531         .listxattr      = generic_listxattr,
6532         .removexattr    = generic_removexattr,
6533 };
6534
6535 const struct nfs_rpc_ops nfs_v4_clientops = {
6536         .version        = 4,                    /* protocol version */
6537         .dentry_ops     = &nfs4_dentry_operations,
6538         .dir_inode_ops  = &nfs4_dir_inode_operations,
6539         .file_inode_ops = &nfs4_file_inode_operations,
6540         .file_ops       = &nfs4_file_operations,
6541         .getroot        = nfs4_proc_get_root,
6542         .getattr        = nfs4_proc_getattr,
6543         .setattr        = nfs4_proc_setattr,
6544         .lookup         = nfs4_proc_lookup,
6545         .access         = nfs4_proc_access,
6546         .readlink       = nfs4_proc_readlink,
6547         .create         = nfs4_proc_create,
6548         .remove         = nfs4_proc_remove,
6549         .unlink_setup   = nfs4_proc_unlink_setup,
6550         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6551         .unlink_done    = nfs4_proc_unlink_done,
6552         .rename         = nfs4_proc_rename,
6553         .rename_setup   = nfs4_proc_rename_setup,
6554         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6555         .rename_done    = nfs4_proc_rename_done,
6556         .link           = nfs4_proc_link,
6557         .symlink        = nfs4_proc_symlink,
6558         .mkdir          = nfs4_proc_mkdir,
6559         .rmdir          = nfs4_proc_remove,
6560         .readdir        = nfs4_proc_readdir,
6561         .mknod          = nfs4_proc_mknod,
6562         .statfs         = nfs4_proc_statfs,
6563         .fsinfo         = nfs4_proc_fsinfo,
6564         .pathconf       = nfs4_proc_pathconf,
6565         .set_capabilities = nfs4_server_capabilities,
6566         .decode_dirent  = nfs4_decode_dirent,
6567         .read_setup     = nfs4_proc_read_setup,
6568         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6569         .read_done      = nfs4_read_done,
6570         .write_setup    = nfs4_proc_write_setup,
6571         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6572         .write_done     = nfs4_write_done,
6573         .commit_setup   = nfs4_proc_commit_setup,
6574         .commit_done    = nfs4_commit_done,
6575         .lock           = nfs4_proc_lock,
6576         .clear_acl_cache = nfs4_zap_acl_attr,
6577         .close_context  = nfs4_close_context,
6578         .open_context   = nfs4_atomic_open,
6579         .init_client    = nfs4_init_client,
6580         .secinfo        = nfs4_proc_secinfo,
6581 };
6582
6583 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6584         .prefix = XATTR_NAME_NFSV4_ACL,
6585         .list   = nfs4_xattr_list_nfs4_acl,
6586         .get    = nfs4_xattr_get_nfs4_acl,
6587         .set    = nfs4_xattr_set_nfs4_acl,
6588 };
6589
6590 const struct xattr_handler *nfs4_xattr_handlers[] = {
6591         &nfs4_xattr_nfs4_acl_handler,
6592         NULL
6593 };
6594
6595 module_param(max_session_slots, ushort, 0644);
6596 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6597                 "requests the client will negotiate");
6598
6599 /*
6600  * Local variables:
6601  *  c-basic-offset: 8
6602  * End:
6603  */