fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67
  68
  69 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96                 return -EREMOTEIO;
  97         case -NFS4ERR_WRONGSEC:
  98                 return -EPERM;
  99         case -NFS4ERR_BADOWNER:
 100         case -NFS4ERR_BADNAME:
 101                 return -EINVAL;
 102         case -NFS4ERR_SHARE_DENIED:
 103                 return -EACCES;
 104         case -NFS4ERR_MINOR_VERS_MISMATCH:
 105                 return -EPROTONOSUPPORT;
 106         case -NFS4ERR_ACCESS:
 107                 return -EACCES;
 108         default:
 109                 dprintk("%s could not handle NFSv4 error %d\n",
 110                                 __func__, -err);
 111                 break;
 112         }
 113         return -EIO;
 114 }
 115
 116 /*
 117  * This is our standard bitmap for GETATTR requests.
 118  */
 119 const u32 nfs4_fattr_bitmap[3] = {
 120         FATTR4_WORD0_TYPE
 121         | FATTR4_WORD0_CHANGE
 122         | FATTR4_WORD0_SIZE
 123         | FATTR4_WORD0_FSID
 124         | FATTR4_WORD0_FILEID,
 125         FATTR4_WORD1_MODE
 126         | FATTR4_WORD1_NUMLINKS
 127         | FATTR4_WORD1_OWNER
 128         | FATTR4_WORD1_OWNER_GROUP
 129         | FATTR4_WORD1_RAWDEV
 130         | FATTR4_WORD1_SPACE_USED
 131         | FATTR4_WORD1_TIME_ACCESS
 132         | FATTR4_WORD1_TIME_METADATA
 133         | FATTR4_WORD1_TIME_MODIFY
 134 };
 135
 136 static const u32 nfs4_pnfs_open_bitmap[3] = {
 137         FATTR4_WORD0_TYPE
 138         | FATTR4_WORD0_CHANGE
 139         | FATTR4_WORD0_SIZE
 140         | FATTR4_WORD0_FSID
 141         | FATTR4_WORD0_FILEID,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY,
 151         FATTR4_WORD2_MDSTHRESHOLD
 152 };
 153
 154 static const u32 nfs4_open_noattr_bitmap[3] = {
 155         FATTR4_WORD0_TYPE
 156         | FATTR4_WORD0_CHANGE
 157         | FATTR4_WORD0_FILEID,
 158 };
 159
 160 const u32 nfs4_statfs_bitmap[2] = {
 161         FATTR4_WORD0_FILES_AVAIL
 162         | FATTR4_WORD0_FILES_FREE
 163         | FATTR4_WORD0_FILES_TOTAL,
 164         FATTR4_WORD1_SPACE_AVAIL
 165         | FATTR4_WORD1_SPACE_FREE
 166         | FATTR4_WORD1_SPACE_TOTAL
 167 };
 168
 169 const u32 nfs4_pathconf_bitmap[2] = {
 170         FATTR4_WORD0_MAXLINK
 171         | FATTR4_WORD0_MAXNAME,
 172         0
 173 };
 174
 175 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 176                         | FATTR4_WORD0_MAXREAD
 177                         | FATTR4_WORD0_MAXWRITE
 178                         | FATTR4_WORD0_LEASE_TIME,
 179                         FATTR4_WORD1_TIME_DELTA
 180                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 181                         FATTR4_WORD2_LAYOUT_BLKSIZE
 182 };
 183
 184 const u32 nfs4_fs_locations_bitmap[2] = {
 185         FATTR4_WORD0_TYPE
 186         | FATTR4_WORD0_CHANGE
 187         | FATTR4_WORD0_SIZE
 188         | FATTR4_WORD0_FSID
 189         | FATTR4_WORD0_FILEID
 190         | FATTR4_WORD0_FS_LOCATIONS,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID
 201 };
 202
 203 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 204                 struct nfs4_readdir_arg *readdir)
 205 {
 206         __be32 *start, *p;
 207
 208         if (cookie > 2) {
 209                 readdir->cookie = cookie;
 210                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 211                 return;
 212         }
 213
 214         readdir->cookie = 0;
 215         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 216         if (cookie == 2)
 217                 return;
 218
 219         /*
 220          * NFSv4 servers do not return entries for '.' and '..'
 221          * Therefore, we fake these entries here.  We let '.'
 222          * have cookie 0 and '..' have cookie 1.  Note that
 223          * when talking to the server, we always send cookie 0
 224          * instead of 1 or 2.
 225          */
 226         start = p = kmap_atomic(*readdir->pages);
 227
 228         if (cookie == 0) {
 229                 *p++ = xdr_one;                                  /* next */
 230                 *p++ = xdr_zero;                   /* cookie, first word */
 231                 *p++ = xdr_one;                   /* cookie, second word */
 232                 *p++ = xdr_one;                             /* entry len */
 233                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 234                 p++;
 235                 *p++ = xdr_one;                         /* bitmap length */
 236                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 237                 *p++ = htonl(8);              /* attribute buffer length */
 238                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 239         }
 240
 241         *p++ = xdr_one;                                  /* next */
 242         *p++ = xdr_zero;                   /* cookie, first word */
 243         *p++ = xdr_two;                   /* cookie, second word */
 244         *p++ = xdr_two;                             /* entry len */
 245         memcpy(p, "..\0\0", 4);                         /* entry */
 246         p++;
 247         *p++ = xdr_one;                         /* bitmap length */
 248         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 249         *p++ = htonl(8);              /* attribute buffer length */
 250         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 251
 252         readdir->pgbase = (char *)p - (char *)start;
 253         readdir->count -= readdir->pgbase;
 254         kunmap_atomic(start);
 255 }
 256
 257 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 258 {
 259         int res = 0;
 260
 261         might_sleep();
 262
 263         if (*timeout <= 0)
 264                 *timeout = NFS4_POLL_RETRY_MIN;
 265         if (*timeout > NFS4_POLL_RETRY_MAX)
 266                 *timeout = NFS4_POLL_RETRY_MAX;
 267         freezable_schedule_timeout_killable(*timeout);
 268         if (fatal_signal_pending(current))
 269                 res = -ERESTARTSYS;
 270         *timeout <<= 1;
 271         return res;
 272 }
 273
 274 /* This is the error handling routine for processes that are allowed
 275  * to sleep.
 276  */
 277 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 278 {
 279         struct nfs_client *clp = server->nfs_client;
 280         struct nfs4_state *state = exception->state;
 281         struct inode *inode = exception->inode;
 282         int ret = errorcode;
 283
 284         exception->retry = 0;
 285         switch(errorcode) {
 286                 case 0:
 287                         return 0;
 288                 case -NFS4ERR_OPENMODE:
 289                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 290                                 nfs4_inode_return_delegation(inode);
 291                                 exception->retry = 1;
 292                                 return 0;
 293                         }
 294                         if (state == NULL)
 295                                 break;
 296                         nfs4_schedule_stateid_recovery(server, state);
 297                         goto wait_on_recovery;
 298                 case -NFS4ERR_DELEG_REVOKED:
 299                 case -NFS4ERR_ADMIN_REVOKED:
 300                 case -NFS4ERR_BAD_STATEID:
 301                         if (state == NULL)
 302                                 break;
 303                         nfs_remove_bad_delegation(state->inode);
 304                         nfs4_schedule_stateid_recovery(server, state);
 305                         goto wait_on_recovery;
 306                 case -NFS4ERR_EXPIRED:
 307                         if (state != NULL)
 308                                 nfs4_schedule_stateid_recovery(server, state);
 309                 case -NFS4ERR_STALE_STATEID:
 310                 case -NFS4ERR_STALE_CLIENTID:
 311                         nfs4_schedule_lease_recovery(clp);
 312                         goto wait_on_recovery;
 313 #if defined(CONFIG_NFS_V4_1)
 314                 case -NFS4ERR_BADSESSION:
 315                 case -NFS4ERR_BADSLOT:
 316                 case -NFS4ERR_BAD_HIGH_SLOT:
 317                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 318                 case -NFS4ERR_DEADSESSION:
 319                 case -NFS4ERR_SEQ_FALSE_RETRY:
 320                 case -NFS4ERR_SEQ_MISORDERED:
 321                         dprintk("%s ERROR: %d Reset session\n", __func__,
 322                                 errorcode);
 323                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 324                         goto wait_on_recovery;
 325 #endif /* defined(CONFIG_NFS_V4_1) */
 326                 case -NFS4ERR_FILE_OPEN:
 327                         if (exception->timeout > HZ) {
 328                                 /* We have retried a decent amount, time to
 329                                  * fail
 330                                  */
 331                                 ret = -EBUSY;
 332                                 break;
 333                         }
 334                 case -NFS4ERR_GRACE:
 335                 case -NFS4ERR_DELAY:
 336                         ret = nfs4_delay(server->client, &exception->timeout);
 337                         if (ret != 0)
 338                                 break;
 339                 case -NFS4ERR_RETRY_UNCACHED_REP:
 340                 case -NFS4ERR_OLD_STATEID:
 341                         exception->retry = 1;
 342                         break;
 343                 case -NFS4ERR_BADOWNER:
 344                         /* The following works around a Linux server bug! */
 345                 case -NFS4ERR_BADNAME:
 346                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 347                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 348                                 exception->retry = 1;
 349                                 printk(KERN_WARNING "NFS: v4 server %s "
 350                                                 "does not accept raw "
 351                                                 "uid/gids. "
 352                                                 "Reenabling the idmapper.\n",
 353                                                 server->nfs_client->cl_hostname);
 354                         }
 355         }
 356         /* We failed to handle the error */
 357         return nfs4_map_errors(ret);
 358 wait_on_recovery:
 359         ret = nfs4_wait_clnt_recover(clp);
 360         if (ret == 0)
 361                 exception->retry = 1;
 362         return ret;
 363 }
 364
 365
 366 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 367 {
 368         spin_lock(&clp->cl_lock);
 369         if (time_before(clp->cl_last_renewal,timestamp))
 370                 clp->cl_last_renewal = timestamp;
 371         spin_unlock(&clp->cl_lock);
 372 }
 373
 374 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 375 {
 376         do_renew_lease(server->nfs_client, timestamp);
 377 }
 378
 379 #if defined(CONFIG_NFS_V4_1)
 380
 381 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 382 {
 383         struct nfs4_session *session;
 384         struct nfs4_slot_table *tbl;
 385         bool send_new_highest_used_slotid = false;
 386
 387         if (!res->sr_slot) {
 388                 /* just wake up the next guy waiting since
 389                  * we may have not consumed a slot after all */
 390                 dprintk("%s: No slot\n", __func__);
 391                 return;
 392         }
 393         tbl = res->sr_slot->table;
 394         session = tbl->session;
 395
 396         spin_lock(&tbl->slot_tbl_lock);
 397         /* Be nice to the server: try to ensure that the last transmitted
 398          * value for highest_user_slotid <= target_highest_slotid
 399          */
 400         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 401                 send_new_highest_used_slotid = true;
 402
 403         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 404                 send_new_highest_used_slotid = false;
 405                 goto out_unlock;
 406         }
 407         nfs4_free_slot(tbl, res->sr_slot);
 408
 409         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 410                 send_new_highest_used_slotid = false;
 411 out_unlock:
 412         spin_unlock(&tbl->slot_tbl_lock);
 413         res->sr_slot = NULL;
 414         if (send_new_highest_used_slotid)
 415                 nfs41_server_notify_highest_slotid_update(session->clp);
 416 }
 417
 418 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 419 {
 420         struct nfs4_session *session;
 421         struct nfs4_slot *slot;
 422         struct nfs_client *clp;
 423         bool interrupted = false;
 424         int ret = 1;
 425
 426         /* don't increment the sequence number if the task wasn't sent */
 427         if (!RPC_WAS_SENT(task))
 428                 goto out;
 429
 430         slot = res->sr_slot;
 431         session = slot->table->session;
 432
 433         if (slot->interrupted) {
 434                 slot->interrupted = 0;
 435                 interrupted = true;
 436         }
 437
 438         /* Check the SEQUENCE operation status */
 439         switch (res->sr_status) {
 440         case 0:
 441                 /* Update the slot's sequence and clientid lease timer */
 442                 ++slot->seq_nr;
 443                 clp = session->clp;
 444                 do_renew_lease(clp, res->sr_timestamp);
 445                 /* Check sequence flags */
 446                 if (res->sr_status_flags != 0)
 447                         nfs4_schedule_lease_recovery(clp);
 448                 nfs41_update_target_slotid(slot->table, slot, res);
 449                 break;
 450         case 1:
 451                 /*
 452                  * sr_status remains 1 if an RPC level error occurred.
 453                  * The server may or may not have processed the sequence
 454                  * operation..
 455                  * Mark the slot as having hosted an interrupted RPC call.
 456                  */
 457                 slot->interrupted = 1;
 458                 goto out;
 459         case -NFS4ERR_DELAY:
 460                 /* The server detected a resend of the RPC call and
 461                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 462                  * of RFC5661.
 463                  */
 464                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 465                         __func__,
 466                         slot->slot_nr,
 467                         slot->seq_nr);
 468                 goto out_retry;
 469         case -NFS4ERR_BADSLOT:
 470                 /*
 471                  * The slot id we used was probably retired. Try again
 472                  * using a different slot id.
 473                  */
 474                 goto retry_nowait;
 475         case -NFS4ERR_SEQ_MISORDERED:
 476                 /*
 477                  * Was the last operation on this sequence interrupted?
 478                  * If so, retry after bumping the sequence number.
 479                  */
 480                 if (interrupted) {
 481                         ++slot->seq_nr;
 482                         goto retry_nowait;
 483                 }
 484                 /*
 485                  * Could this slot have been previously retired?
 486                  * If so, then the server may be expecting seq_nr = 1!
 487                  */
 488                 if (slot->seq_nr != 1) {
 489                         slot->seq_nr = 1;
 490                         goto retry_nowait;
 491                 }
 492                 break;
 493         case -NFS4ERR_SEQ_FALSE_RETRY:
 494                 ++slot->seq_nr;
 495                 goto retry_nowait;
 496         default:
 497                 /* Just update the slot sequence no. */
 498                 ++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 ret;
 505 retry_nowait:
 506         if (rpc_restart_call_prepare(task)) {
 507                 task->tk_status = 0;
 508                 ret = 0;
 509         }
 510         goto out;
 511 out_retry:
 512         if (!rpc_restart_call(task))
 513                 goto out;
 514         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 515         return 0;
 516 }
 517
 518 static int nfs4_sequence_done(struct rpc_task *task,
 519                                struct nfs4_sequence_res *res)
 520 {
 521         if (res->sr_slot == NULL)
 522                 return 1;
 523         return nfs41_sequence_done(task, res);
 524 }
 525
 526 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 527                 struct nfs4_sequence_res *res, int cache_reply)
 528 {
 529         args->sa_slot = NULL;
 530         args->sa_cache_this = 0;
 531         args->sa_privileged = 0;
 532         if (cache_reply)
 533                 args->sa_cache_this = 1;
 534         res->sr_slot = NULL;
 535 }
 536
 537 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 538 {
 539         args->sa_privileged = 1;
 540 }
 541
 542 int nfs41_setup_sequence(struct nfs4_session *session,
 543                                 struct nfs4_sequence_args *args,
 544                                 struct nfs4_sequence_res *res,
 545                                 struct rpc_task *task)
 546 {
 547         struct nfs4_slot *slot;
 548         struct nfs4_slot_table *tbl;
 549
 550         dprintk("--> %s\n", __func__);
 551         /* slot already allocated? */
 552         if (res->sr_slot != NULL)
 553                 goto out_success;
 554
 555         tbl = &session->fc_slot_table;
 556
 557         task->tk_timeout = 0;
 558
 559         spin_lock(&tbl->slot_tbl_lock);
 560         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 561             !args->sa_privileged) {
 562                 /* The state manager will wait until the slot table is empty */
 563                 dprintk("%s session is draining\n", __func__);
 564                 goto out_sleep;
 565         }
 566
 567         slot = nfs4_alloc_slot(tbl);
 568         if (IS_ERR(slot)) {
 569                 /* If out of memory, try again in 1/4 second */
 570                 if (slot == ERR_PTR(-ENOMEM))
 571                         task->tk_timeout = HZ >> 2;
 572                 dprintk("<-- %s: no free slots\n", __func__);
 573                 goto out_sleep;
 574         }
 575         spin_unlock(&tbl->slot_tbl_lock);
 576
 577         args->sa_slot = slot;
 578
 579         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 580                         slot->slot_nr, slot->seq_nr);
 581
 582         res->sr_slot = slot;
 583         res->sr_timestamp = jiffies;
 584         res->sr_status_flags = 0;
 585         /*
 586          * sr_status is only set in decode_sequence, and so will remain
 587          * set to 1 if an rpc level failure occurs.
 588          */
 589         res->sr_status = 1;
 590 out_success:
 591         rpc_call_start(task);
 592         return 0;
 593 out_sleep:
 594         /* Privileged tasks are queued with top priority */
 595         if (args->sa_privileged)
 596                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 597                                 NULL, RPC_PRIORITY_PRIVILEGED);
 598         else
 599                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 600         spin_unlock(&tbl->slot_tbl_lock);
 601         return -EAGAIN;
 602 }
 603 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 604
 605 int nfs4_setup_sequence(const struct nfs_server *server,
 606                         struct nfs4_sequence_args *args,
 607                         struct nfs4_sequence_res *res,
 608                         struct rpc_task *task)
 609 {
 610         struct nfs4_session *session = nfs4_get_session(server);
 611         int ret = 0;
 612
 613         if (session == NULL) {
 614                 rpc_call_start(task);
 615                 goto out;
 616         }
 617
 618         dprintk("--> %s clp %p session %p sr_slot %d\n",
 619                 __func__, session->clp, session, res->sr_slot ?
 620                         res->sr_slot->slot_nr : -1);
 621
 622         ret = nfs41_setup_sequence(session, args, res, task);
 623 out:
 624         dprintk("<-- %s status=%d\n", __func__, ret);
 625         return ret;
 626 }
 627
 628 struct nfs41_call_sync_data {
 629         const struct nfs_server *seq_server;
 630         struct nfs4_sequence_args *seq_args;
 631         struct nfs4_sequence_res *seq_res;
 632 };
 633
 634 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 635 {
 636         struct nfs41_call_sync_data *data = calldata;
 637         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 638
 639         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 640
 641         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 642 }
 643
 644 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 645 {
 646         struct nfs41_call_sync_data *data = calldata;
 647
 648         nfs41_sequence_done(task, data->seq_res);
 649 }
 650
 651 static const struct rpc_call_ops nfs41_call_sync_ops = {
 652         .rpc_call_prepare = nfs41_call_sync_prepare,
 653         .rpc_call_done = nfs41_call_sync_done,
 654 };
 655
 656 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 657                                    struct nfs_server *server,
 658                                    struct rpc_message *msg,
 659                                    struct nfs4_sequence_args *args,
 660                                    struct nfs4_sequence_res *res)
 661 {
 662         int ret;
 663         struct rpc_task *task;
 664         struct nfs41_call_sync_data data = {
 665                 .seq_server = server,
 666                 .seq_args = args,
 667                 .seq_res = res,
 668         };
 669         struct rpc_task_setup task_setup = {
 670                 .rpc_client = clnt,
 671                 .rpc_message = msg,
 672                 .callback_ops = &nfs41_call_sync_ops,
 673                 .callback_data = &data
 674         };
 675
 676         task = rpc_run_task(&task_setup);
 677         if (IS_ERR(task))
 678                 ret = PTR_ERR(task);
 679         else {
 680                 ret = task->tk_status;
 681                 rpc_put_task(task);
 682         }
 683         return ret;
 684 }
 685
 686 #else
 687 static
 688 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 689                 struct nfs4_sequence_res *res, int cache_reply)
 690 {
 691 }
 692
 693 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 694 {
 695 }
 696
 697
 698 static int nfs4_sequence_done(struct rpc_task *task,
 699                                struct nfs4_sequence_res *res)
 700 {
 701         return 1;
 702 }
 703 #endif /* CONFIG_NFS_V4_1 */
 704
 705 static
 706 int _nfs4_call_sync(struct rpc_clnt *clnt,
 707                     struct nfs_server *server,
 708                     struct rpc_message *msg,
 709                     struct nfs4_sequence_args *args,
 710                     struct nfs4_sequence_res *res)
 711 {
 712         return rpc_call_sync(clnt, msg, 0);
 713 }
 714
 715 static
 716 int nfs4_call_sync(struct rpc_clnt *clnt,
 717                    struct nfs_server *server,
 718                    struct rpc_message *msg,
 719                    struct nfs4_sequence_args *args,
 720                    struct nfs4_sequence_res *res,
 721                    int cache_reply)
 722 {
 723         nfs41_init_sequence(args, res, cache_reply);
 724         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 725                                                 args, res);
 726 }
 727
 728 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 729 {
 730         struct nfs_inode *nfsi = NFS_I(dir);
 731
 732         spin_lock(&dir->i_lock);
 733         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 734         if (!cinfo->atomic || cinfo->before != dir->i_version)
 735                 nfs_force_lookup_revalidate(dir);
 736         dir->i_version = cinfo->after;
 737         spin_unlock(&dir->i_lock);
 738 }
 739
 740 struct nfs4_opendata {
 741         struct kref kref;
 742         struct nfs_openargs o_arg;
 743         struct nfs_openres o_res;
 744         struct nfs_open_confirmargs c_arg;
 745         struct nfs_open_confirmres c_res;
 746         struct nfs4_string owner_name;
 747         struct nfs4_string group_name;
 748         struct nfs_fattr f_attr;
 749         struct dentry *dir;
 750         struct dentry *dentry;
 751         struct nfs4_state_owner *owner;
 752         struct nfs4_state *state;
 753         struct iattr attrs;
 754         unsigned long timestamp;
 755         unsigned int rpc_done : 1;
 756         int rpc_status;
 757         int cancelled;
 758 };
 759
 760
 761 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 762 {
 763         p->o_res.f_attr = &p->f_attr;
 764         p->o_res.seqid = p->o_arg.seqid;
 765         p->c_res.seqid = p->c_arg.seqid;
 766         p->o_res.server = p->o_arg.server;
 767         p->o_res.access_request = p->o_arg.access;
 768         nfs_fattr_init(&p->f_attr);
 769         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 770 }
 771
 772 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 773                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 774                 const struct iattr *attrs,
 775                 gfp_t gfp_mask)
 776 {
 777         struct dentry *parent = dget_parent(dentry);
 778         struct inode *dir = parent->d_inode;
 779         struct nfs_server *server = NFS_SERVER(dir);
 780         struct nfs4_opendata *p;
 781
 782         p = kzalloc(sizeof(*p), gfp_mask);
 783         if (p == NULL)
 784                 goto err;
 785         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 786         if (p->o_arg.seqid == NULL)
 787                 goto err_free;
 788         nfs_sb_active(dentry->d_sb);
 789         p->dentry = dget(dentry);
 790         p->dir = parent;
 791         p->owner = sp;
 792         atomic_inc(&sp->so_count);
 793         p->o_arg.fh = NFS_FH(dir);
 794         p->o_arg.open_flags = flags;
 795         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 796         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 797          * will return permission denied for all bits until close */
 798         if (!(flags & O_EXCL)) {
 799                 /* ask server to check for all possible rights as results
 800                  * are cached */
 801                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 802                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 803         }
 804         p->o_arg.clientid = server->nfs_client->cl_clientid;
 805         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 806         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 807         p->o_arg.name = &dentry->d_name;
 808         p->o_arg.server = server;
 809         p->o_arg.bitmask = server->attr_bitmask;
 810         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 811         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 812         if (attrs != NULL && attrs->ia_valid != 0) {
 813                 __be32 verf[2];
 814
 815                 p->o_arg.u.attrs = &p->attrs;
 816                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 817
 818                 verf[0] = jiffies;
 819                 verf[1] = current->pid;
 820                 memcpy(p->o_arg.u.verifier.data, verf,
 821                                 sizeof(p->o_arg.u.verifier.data));
 822         }
 823         p->c_arg.fh = &p->o_res.fh;
 824         p->c_arg.stateid = &p->o_res.stateid;
 825         p->c_arg.seqid = p->o_arg.seqid;
 826         nfs4_init_opendata_res(p);
 827         kref_init(&p->kref);
 828         return p;
 829 err_free:
 830         kfree(p);
 831 err:
 832         dput(parent);
 833         return NULL;
 834 }
 835
 836 static void nfs4_opendata_free(struct kref *kref)
 837 {
 838         struct nfs4_opendata *p = container_of(kref,
 839                         struct nfs4_opendata, kref);
 840         struct super_block *sb = p->dentry->d_sb;
 841
 842         nfs_free_seqid(p->o_arg.seqid);
 843         if (p->state != NULL)
 844                 nfs4_put_open_state(p->state);
 845         nfs4_put_state_owner(p->owner);
 846         dput(p->dir);
 847         dput(p->dentry);
 848         nfs_sb_deactive(sb);
 849         nfs_fattr_free_names(&p->f_attr);
 850         kfree(p);
 851 }
 852
 853 static void nfs4_opendata_put(struct nfs4_opendata *p)
 854 {
 855         if (p != NULL)
 856                 kref_put(&p->kref, nfs4_opendata_free);
 857 }
 858
 859 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 860 {
 861         int ret;
 862
 863         ret = rpc_wait_for_completion_task(task);
 864         return ret;
 865 }
 866
 867 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 868 {
 869         int ret = 0;
 870
 871         if (open_mode & (O_EXCL|O_TRUNC))
 872                 goto out;
 873         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 874                 case FMODE_READ:
 875                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 876                                 && state->n_rdonly != 0;
 877                         break;
 878                 case FMODE_WRITE:
 879                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 880                                 && state->n_wronly != 0;
 881                         break;
 882                 case FMODE_READ|FMODE_WRITE:
 883                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 884                                 && state->n_rdwr != 0;
 885         }
 886 out:
 887         return ret;
 888 }
 889
 890 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 891 {
 892         if (delegation == NULL)
 893                 return 0;
 894         if ((delegation->type & fmode) != fmode)
 895                 return 0;
 896         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 897                 return 0;
 898         nfs_mark_delegation_referenced(delegation);
 899         return 1;
 900 }
 901
 902 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 903 {
 904         switch (fmode) {
 905                 case FMODE_WRITE:
 906                         state->n_wronly++;
 907                         break;
 908                 case FMODE_READ:
 909                         state->n_rdonly++;
 910                         break;
 911                 case FMODE_READ|FMODE_WRITE:
 912                         state->n_rdwr++;
 913         }
 914         nfs4_state_set_mode_locked(state, state->state | fmode);
 915 }
 916
 917 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 918 {
 919         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 920                 nfs4_stateid_copy(&state->stateid, stateid);
 921         nfs4_stateid_copy(&state->open_stateid, stateid);
 922         switch (fmode) {
 923                 case FMODE_READ:
 924                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 925                         break;
 926                 case FMODE_WRITE:
 927                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 928                         break;
 929                 case FMODE_READ|FMODE_WRITE:
 930                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 931         }
 932 }
 933
 934 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 935 {
 936         write_seqlock(&state->seqlock);
 937         nfs_set_open_stateid_locked(state, stateid, fmode);
 938         write_sequnlock(&state->seqlock);
 939 }
 940
 941 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 942 {
 943         /*
 944          * Protect the call to nfs4_state_set_mode_locked and
 945          * serialise the stateid update
 946          */
 947         write_seqlock(&state->seqlock);
 948         if (deleg_stateid != NULL) {
 949                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 950                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 951         }
 952         if (open_stateid != NULL)
 953                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 954         write_sequnlock(&state->seqlock);
 955         spin_lock(&state->owner->so_lock);
 956         update_open_stateflags(state, fmode);
 957         spin_unlock(&state->owner->so_lock);
 958 }
 959
 960 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 961 {
 962         struct nfs_inode *nfsi = NFS_I(state->inode);
 963         struct nfs_delegation *deleg_cur;
 964         int ret = 0;
 965
 966         fmode &= (FMODE_READ|FMODE_WRITE);
 967
 968         rcu_read_lock();
 969         deleg_cur = rcu_dereference(nfsi->delegation);
 970         if (deleg_cur == NULL)
 971                 goto no_delegation;
 972
 973         spin_lock(&deleg_cur->lock);
 974         if (nfsi->delegation != deleg_cur ||
 975             (deleg_cur->type & fmode) != fmode)
 976                 goto no_delegation_unlock;
 977
 978         if (delegation == NULL)
 979                 delegation = &deleg_cur->stateid;
 980         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 981                 goto no_delegation_unlock;
 982
 983         nfs_mark_delegation_referenced(deleg_cur);
 984         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 985         ret = 1;
 986 no_delegation_unlock:
 987         spin_unlock(&deleg_cur->lock);
 988 no_delegation:
 989         rcu_read_unlock();
 990
 991         if (!ret && open_stateid != NULL) {
 992                 __update_open_stateid(state, open_stateid, NULL, fmode);
 993                 ret = 1;
 994         }
 995
 996         return ret;
 997 }
 998
 999
1000 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1001 {
1002         struct nfs_delegation *delegation;
1003
1004         rcu_read_lock();
1005         delegation = rcu_dereference(NFS_I(inode)->delegation);
1006         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1007                 rcu_read_unlock();
1008                 return;
1009         }
1010         rcu_read_unlock();
1011         nfs4_inode_return_delegation(inode);
1012 }
1013
1014 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1015 {
1016         struct nfs4_state *state = opendata->state;
1017         struct nfs_inode *nfsi = NFS_I(state->inode);
1018         struct nfs_delegation *delegation;
1019         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1020         fmode_t fmode = opendata->o_arg.fmode;
1021         nfs4_stateid stateid;
1022         int ret = -EAGAIN;
1023
1024         for (;;) {
1025                 if (can_open_cached(state, fmode, open_mode)) {
1026                         spin_lock(&state->owner->so_lock);
1027                         if (can_open_cached(state, fmode, open_mode)) {
1028                                 update_open_stateflags(state, fmode);
1029                                 spin_unlock(&state->owner->so_lock);
1030                                 goto out_return_state;
1031                         }
1032                         spin_unlock(&state->owner->so_lock);
1033                 }
1034                 rcu_read_lock();
1035                 delegation = rcu_dereference(nfsi->delegation);
1036                 if (!can_open_delegated(delegation, fmode)) {
1037                         rcu_read_unlock();
1038                         break;
1039                 }
1040                 /* Save the delegation */
1041                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1042                 rcu_read_unlock();
1043                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1044                 if (ret != 0)
1045                         goto out;
1046                 ret = -EAGAIN;
1047
1048                 /* Try to update the stateid using the delegation */
1049                 if (update_open_stateid(state, NULL, &stateid, fmode))
1050                         goto out_return_state;
1051         }
1052 out:
1053         return ERR_PTR(ret);
1054 out_return_state:
1055         atomic_inc(&state->count);
1056         return state;
1057 }
1058
1059 static void
1060 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1061 {
1062         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1063         struct nfs_delegation *delegation;
1064         int delegation_flags = 0;
1065
1066         rcu_read_lock();
1067         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1068         if (delegation)
1069                 delegation_flags = delegation->flags;
1070         rcu_read_unlock();
1071         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1072                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1073                                    "returning a delegation for "
1074                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1075                                    clp->cl_hostname);
1076         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1077                 nfs_inode_set_delegation(state->inode,
1078                                          data->owner->so_cred,
1079                                          &data->o_res);
1080         else
1081                 nfs_inode_reclaim_delegation(state->inode,
1082                                              data->owner->so_cred,
1083                                              &data->o_res);
1084 }
1085
1086 /*
1087  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1088  * and update the nfs4_state.
1089  */
1090 static struct nfs4_state *
1091 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1092 {
1093         struct inode *inode = data->state->inode;
1094         struct nfs4_state *state = data->state;
1095         int ret;
1096
1097         if (!data->rpc_done) {
1098                 ret = data->rpc_status;
1099                 goto err;
1100         }
1101
1102         ret = -ESTALE;
1103         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1104             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1105             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1106                 goto err;
1107
1108         ret = -ENOMEM;
1109         state = nfs4_get_open_state(inode, data->owner);
1110         if (state == NULL)
1111                 goto err;
1112
1113         ret = nfs_refresh_inode(inode, &data->f_attr);
1114         if (ret)
1115                 goto err;
1116
1117         if (data->o_res.delegation_type != 0)
1118                 nfs4_opendata_check_deleg(data, state);
1119         update_open_stateid(state, &data->o_res.stateid, NULL,
1120                             data->o_arg.fmode);
1121
1122         return state;
1123 err:
1124         return ERR_PTR(ret);
1125
1126 }
1127
1128 static struct nfs4_state *
1129 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1130 {
1131         struct inode *inode;
1132         struct nfs4_state *state = NULL;
1133         int ret;
1134
1135         if (!data->rpc_done) {
1136                 state = nfs4_try_open_cached(data);
1137                 goto out;
1138         }
1139
1140         ret = -EAGAIN;
1141         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1142                 goto err;
1143         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1144         ret = PTR_ERR(inode);
1145         if (IS_ERR(inode))
1146                 goto err;
1147         ret = -ENOMEM;
1148         state = nfs4_get_open_state(inode, data->owner);
1149         if (state == NULL)
1150                 goto err_put_inode;
1151         if (data->o_res.delegation_type != 0)
1152                 nfs4_opendata_check_deleg(data, state);
1153         update_open_stateid(state, &data->o_res.stateid, NULL,
1154                         data->o_arg.fmode);
1155         iput(inode);
1156 out:
1157         return state;
1158 err_put_inode:
1159         iput(inode);
1160 err:
1161         return ERR_PTR(ret);
1162 }
1163
1164 static struct nfs4_state *
1165 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1166 {
1167         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1168                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1169         return _nfs4_opendata_to_nfs4_state(data);
1170 }
1171
1172 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1173 {
1174         struct nfs_inode *nfsi = NFS_I(state->inode);
1175         struct nfs_open_context *ctx;
1176
1177         spin_lock(&state->inode->i_lock);
1178         list_for_each_entry(ctx, &nfsi->open_files, list) {
1179                 if (ctx->state != state)
1180                         continue;
1181                 get_nfs_open_context(ctx);
1182                 spin_unlock(&state->inode->i_lock);
1183                 return ctx;
1184         }
1185         spin_unlock(&state->inode->i_lock);
1186         return ERR_PTR(-ENOENT);
1187 }
1188
1189 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1190 {
1191         struct nfs4_opendata *opendata;
1192
1193         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1194         if (opendata == NULL)
1195                 return ERR_PTR(-ENOMEM);
1196         opendata->state = state;
1197         atomic_inc(&state->count);
1198         return opendata;
1199 }
1200
1201 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1202 {
1203         struct nfs4_state *newstate;
1204         int ret;
1205
1206         opendata->o_arg.open_flags = 0;
1207         opendata->o_arg.fmode = fmode;
1208         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1209         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1210         nfs4_init_opendata_res(opendata);
1211         ret = _nfs4_recover_proc_open(opendata);
1212         if (ret != 0)
1213                 return ret;
1214         newstate = nfs4_opendata_to_nfs4_state(opendata);
1215         if (IS_ERR(newstate))
1216                 return PTR_ERR(newstate);
1217         nfs4_close_state(newstate, fmode);
1218         *res = newstate;
1219         return 0;
1220 }
1221
1222 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1223 {
1224         struct nfs4_state *newstate;
1225         int ret;
1226
1227         /* memory barrier prior to reading state->n_* */
1228         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1229         smp_rmb();
1230         if (state->n_rdwr != 0) {
1231                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1232                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1233                 if (ret != 0)
1234                         return ret;
1235                 if (newstate != state)
1236                         return -ESTALE;
1237         }
1238         if (state->n_wronly != 0) {
1239                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1240                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1241                 if (ret != 0)
1242                         return ret;
1243                 if (newstate != state)
1244                         return -ESTALE;
1245         }
1246         if (state->n_rdonly != 0) {
1247                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1248                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1249                 if (ret != 0)
1250                         return ret;
1251                 if (newstate != state)
1252                         return -ESTALE;
1253         }
1254         /*
1255          * We may have performed cached opens for all three recoveries.
1256          * Check if we need to update the current stateid.
1257          */
1258         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1259             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1260                 write_seqlock(&state->seqlock);
1261                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1262                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1263                 write_sequnlock(&state->seqlock);
1264         }
1265         return 0;
1266 }
1267
1268 /*
1269  * OPEN_RECLAIM:
1270  *      reclaim state on the server after a reboot.
1271  */
1272 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1273 {
1274         struct nfs_delegation *delegation;
1275         struct nfs4_opendata *opendata;
1276         fmode_t delegation_type = 0;
1277         int status;
1278
1279         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1280         if (IS_ERR(opendata))
1281                 return PTR_ERR(opendata);
1282         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1283         opendata->o_arg.fh = NFS_FH(state->inode);
1284         rcu_read_lock();
1285         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1286         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1287                 delegation_type = delegation->type;
1288         rcu_read_unlock();
1289         opendata->o_arg.u.delegation_type = delegation_type;
1290         status = nfs4_open_recover(opendata, state);
1291         nfs4_opendata_put(opendata);
1292         return status;
1293 }
1294
1295 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1296 {
1297         struct nfs_server *server = NFS_SERVER(state->inode);
1298         struct nfs4_exception exception = { };
1299         int err;
1300         do {
1301                 err = _nfs4_do_open_reclaim(ctx, state);
1302                 if (err != -NFS4ERR_DELAY)
1303                         break;
1304                 nfs4_handle_exception(server, err, &exception);
1305         } while (exception.retry);
1306         return err;
1307 }
1308
1309 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1310 {
1311         struct nfs_open_context *ctx;
1312         int ret;
1313
1314         ctx = nfs4_state_find_open_context(state);
1315         if (IS_ERR(ctx))
1316                 return PTR_ERR(ctx);
1317         ret = nfs4_do_open_reclaim(ctx, state);
1318         put_nfs_open_context(ctx);
1319         return ret;
1320 }
1321
1322 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1323 {
1324         struct nfs4_opendata *opendata;
1325         int ret;
1326
1327         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1328         if (IS_ERR(opendata))
1329                 return PTR_ERR(opendata);
1330         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1331         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1332         ret = nfs4_open_recover(opendata, state);
1333         nfs4_opendata_put(opendata);
1334         return ret;
1335 }
1336
1337 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1338 {
1339         struct nfs4_exception exception = { };
1340         struct nfs_server *server = NFS_SERVER(state->inode);
1341         int err;
1342         do {
1343                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1344                 switch (err) {
1345                         case 0:
1346                         case -ENOENT:
1347                         case -ESTALE:
1348                                 goto out;
1349                         case -NFS4ERR_BADSESSION:
1350                         case -NFS4ERR_BADSLOT:
1351                         case -NFS4ERR_BAD_HIGH_SLOT:
1352                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1353                         case -NFS4ERR_DEADSESSION:
1354                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1355                                 goto out;
1356                         case -NFS4ERR_STALE_CLIENTID:
1357                         case -NFS4ERR_STALE_STATEID:
1358                         case -NFS4ERR_EXPIRED:
1359                                 /* Don't recall a delegation if it was lost */
1360                                 nfs4_schedule_lease_recovery(server->nfs_client);
1361                                 goto out;
1362                         case -ERESTARTSYS:
1363                                 /*
1364                                  * The show must go on: exit, but mark the
1365                                  * stateid as needing recovery.
1366                                  */
1367                         case -NFS4ERR_DELEG_REVOKED:
1368                         case -NFS4ERR_ADMIN_REVOKED:
1369                         case -NFS4ERR_BAD_STATEID:
1370                                 nfs_inode_find_state_and_recover(state->inode,
1371                                                 stateid);
1372                                 nfs4_schedule_stateid_recovery(server, state);
1373                         case -ENOMEM:
1374                                 err = 0;
1375                                 goto out;
1376                 }
1377                 err = nfs4_handle_exception(server, err, &exception);
1378         } while (exception.retry);
1379 out:
1380         return err;
1381 }
1382
1383 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1384 {
1385         struct nfs4_opendata *data = calldata;
1386
1387         data->rpc_status = task->tk_status;
1388         if (data->rpc_status == 0) {
1389                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1390                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1391                 renew_lease(data->o_res.server, data->timestamp);
1392                 data->rpc_done = 1;
1393         }
1394 }
1395
1396 static void nfs4_open_confirm_release(void *calldata)
1397 {
1398         struct nfs4_opendata *data = calldata;
1399         struct nfs4_state *state = NULL;
1400
1401         /* If this request hasn't been cancelled, do nothing */
1402         if (data->cancelled == 0)
1403                 goto out_free;
1404         /* In case of error, no cleanup! */
1405         if (!data->rpc_done)
1406                 goto out_free;
1407         state = nfs4_opendata_to_nfs4_state(data);
1408         if (!IS_ERR(state))
1409                 nfs4_close_state(state, data->o_arg.fmode);
1410 out_free:
1411         nfs4_opendata_put(data);
1412 }
1413
1414 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1415         .rpc_call_done = nfs4_open_confirm_done,
1416         .rpc_release = nfs4_open_confirm_release,
1417 };
1418
1419 /*
1420  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1421  */
1422 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1423 {
1424         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1425         struct rpc_task *task;
1426         struct  rpc_message msg = {
1427                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1428                 .rpc_argp = &data->c_arg,
1429                 .rpc_resp = &data->c_res,
1430                 .rpc_cred = data->owner->so_cred,
1431         };
1432         struct rpc_task_setup task_setup_data = {
1433                 .rpc_client = server->client,
1434                 .rpc_message = &msg,
1435                 .callback_ops = &nfs4_open_confirm_ops,
1436                 .callback_data = data,
1437                 .workqueue = nfsiod_workqueue,
1438                 .flags = RPC_TASK_ASYNC,
1439         };
1440         int status;
1441
1442         kref_get(&data->kref);
1443         data->rpc_done = 0;
1444         data->rpc_status = 0;
1445         data->timestamp = jiffies;
1446         task = rpc_run_task(&task_setup_data);
1447         if (IS_ERR(task))
1448                 return PTR_ERR(task);
1449         status = nfs4_wait_for_completion_rpc_task(task);
1450         if (status != 0) {
1451                 data->cancelled = 1;
1452                 smp_wmb();
1453         } else
1454                 status = data->rpc_status;
1455         rpc_put_task(task);
1456         return status;
1457 }
1458
1459 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1460 {
1461         struct nfs4_opendata *data = calldata;
1462         struct nfs4_state_owner *sp = data->owner;
1463
1464         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1465                 return;
1466         /*
1467          * Check if we still need to send an OPEN call, or if we can use
1468          * a delegation instead.
1469          */
1470         if (data->state != NULL) {
1471                 struct nfs_delegation *delegation;
1472
1473                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1474                         goto out_no_action;
1475                 rcu_read_lock();
1476                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1477                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1478                     can_open_delegated(delegation, data->o_arg.fmode))
1479                         goto unlock_no_action;
1480                 rcu_read_unlock();
1481         }
1482         /* Update client id. */
1483         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1484         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1485                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1486                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1487                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1488         }
1489         data->timestamp = jiffies;
1490         if (nfs4_setup_sequence(data->o_arg.server,
1491                                 &data->o_arg.seq_args,
1492                                 &data->o_res.seq_res,
1493                                 task) != 0)
1494                 nfs_release_seqid(data->o_arg.seqid);
1495         return;
1496 unlock_no_action:
1497         rcu_read_unlock();
1498 out_no_action:
1499         task->tk_action = NULL;
1500         nfs4_sequence_done(task, &data->o_res.seq_res);
1501 }
1502
1503 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1504 {
1505         struct nfs4_opendata *data = calldata;
1506
1507         data->rpc_status = task->tk_status;
1508
1509         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1510                 return;
1511
1512         if (task->tk_status == 0) {
1513                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1514                         switch (data->o_res.f_attr->mode & S_IFMT) {
1515                         case S_IFREG:
1516                                 break;
1517                         case S_IFLNK:
1518                                 data->rpc_status = -ELOOP;
1519                                 break;
1520                         case S_IFDIR:
1521                                 data->rpc_status = -EISDIR;
1522                                 break;
1523                         default:
1524                                 data->rpc_status = -ENOTDIR;
1525                         }
1526                 }
1527                 renew_lease(data->o_res.server, data->timestamp);
1528                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1529                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1530         }
1531         data->rpc_done = 1;
1532 }
1533
1534 static void nfs4_open_release(void *calldata)
1535 {
1536         struct nfs4_opendata *data = calldata;
1537         struct nfs4_state *state = NULL;
1538
1539         /* If this request hasn't been cancelled, do nothing */
1540         if (data->cancelled == 0)
1541                 goto out_free;
1542         /* In case of error, no cleanup! */
1543         if (data->rpc_status != 0 || !data->rpc_done)
1544                 goto out_free;
1545         /* In case we need an open_confirm, no cleanup! */
1546         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1547                 goto out_free;
1548         state = nfs4_opendata_to_nfs4_state(data);
1549         if (!IS_ERR(state))
1550                 nfs4_close_state(state, data->o_arg.fmode);
1551 out_free:
1552         nfs4_opendata_put(data);
1553 }
1554
1555 static const struct rpc_call_ops nfs4_open_ops = {
1556         .rpc_call_prepare = nfs4_open_prepare,
1557         .rpc_call_done = nfs4_open_done,
1558         .rpc_release = nfs4_open_release,
1559 };
1560
1561 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1562 {
1563         struct inode *dir = data->dir->d_inode;
1564         struct nfs_server *server = NFS_SERVER(dir);
1565         struct nfs_openargs *o_arg = &data->o_arg;
1566         struct nfs_openres *o_res = &data->o_res;
1567         struct rpc_task *task;
1568         struct rpc_message msg = {
1569                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1570                 .rpc_argp = o_arg,
1571                 .rpc_resp = o_res,
1572                 .rpc_cred = data->owner->so_cred,
1573         };
1574         struct rpc_task_setup task_setup_data = {
1575                 .rpc_client = server->client,
1576                 .rpc_message = &msg,
1577                 .callback_ops = &nfs4_open_ops,
1578                 .callback_data = data,
1579                 .workqueue = nfsiod_workqueue,
1580                 .flags = RPC_TASK_ASYNC,
1581         };
1582         int status;
1583
1584         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1585         kref_get(&data->kref);
1586         data->rpc_done = 0;
1587         data->rpc_status = 0;
1588         data->cancelled = 0;
1589         if (isrecover)
1590                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1591         task = rpc_run_task(&task_setup_data);
1592         if (IS_ERR(task))
1593                 return PTR_ERR(task);
1594         status = nfs4_wait_for_completion_rpc_task(task);
1595         if (status != 0) {
1596                 data->cancelled = 1;
1597                 smp_wmb();
1598         } else
1599                 status = data->rpc_status;
1600         rpc_put_task(task);
1601
1602         return status;
1603 }
1604
1605 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1606 {
1607         struct inode *dir = data->dir->d_inode;
1608         struct nfs_openres *o_res = &data->o_res;
1609         int status;
1610
1611         status = nfs4_run_open_task(data, 1);
1612         if (status != 0 || !data->rpc_done)
1613                 return status;
1614
1615         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1616
1617         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1618                 status = _nfs4_proc_open_confirm(data);
1619                 if (status != 0)
1620                         return status;
1621         }
1622
1623         return status;
1624 }
1625
1626 static int nfs4_opendata_access(struct rpc_cred *cred,
1627                                 struct nfs4_opendata *opendata,
1628                                 struct nfs4_state *state, fmode_t fmode)
1629 {
1630         struct nfs_access_entry cache;
1631         u32 mask;
1632
1633         /* access call failed or for some reason the server doesn't
1634          * support any access modes -- defer access call until later */
1635         if (opendata->o_res.access_supported == 0)
1636                 return 0;
1637
1638         mask = 0;
1639         /* don't check MAY_WRITE - a newly created file may not have
1640          * write mode bits, but POSIX allows the creating process to write */
1641         if (fmode & FMODE_READ)
1642                 mask |= MAY_READ;
1643         if (fmode & FMODE_EXEC)
1644                 mask |= MAY_EXEC;
1645
1646         cache.cred = cred;
1647         cache.jiffies = jiffies;
1648         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1649         nfs_access_add_cache(state->inode, &cache);
1650
1651         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1652                 return 0;
1653
1654         /* even though OPEN succeeded, access is denied. Close the file */
1655         nfs4_close_state(state, fmode);
1656         return -EACCES;
1657 }
1658
1659 /*
1660  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1661  */
1662 static int _nfs4_proc_open(struct nfs4_opendata *data)
1663 {
1664         struct inode *dir = data->dir->d_inode;
1665         struct nfs_server *server = NFS_SERVER(dir);
1666         struct nfs_openargs *o_arg = &data->o_arg;
1667         struct nfs_openres *o_res = &data->o_res;
1668         int status;
1669
1670         status = nfs4_run_open_task(data, 0);
1671         if (!data->rpc_done)
1672                 return status;
1673         if (status != 0) {
1674                 if (status == -NFS4ERR_BADNAME &&
1675                                 !(o_arg->open_flags & O_CREAT))
1676                         return -ENOENT;
1677                 return status;
1678         }
1679
1680         nfs_fattr_map_and_free_names(server, &data->f_attr);
1681
1682         if (o_arg->open_flags & O_CREAT)
1683                 update_changeattr(dir, &o_res->cinfo);
1684         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1685                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1686         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1687                 status = _nfs4_proc_open_confirm(data);
1688                 if (status != 0)
1689                         return status;
1690         }
1691         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1692                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1693         return 0;
1694 }
1695
1696 static int nfs4_recover_expired_lease(struct nfs_server *server)
1697 {
1698         return nfs4_client_recover_expired_lease(server->nfs_client);
1699 }
1700
1701 /*
1702  * OPEN_EXPIRED:
1703  *      reclaim state on the server after a network partition.
1704  *      Assumes caller holds the appropriate lock
1705  */
1706 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1707 {
1708         struct nfs4_opendata *opendata;
1709         int ret;
1710
1711         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1712         if (IS_ERR(opendata))
1713                 return PTR_ERR(opendata);
1714         ret = nfs4_open_recover(opendata, state);
1715         if (ret == -ESTALE)
1716                 d_drop(ctx->dentry);
1717         nfs4_opendata_put(opendata);
1718         return ret;
1719 }
1720
1721 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1722 {
1723         struct nfs_server *server = NFS_SERVER(state->inode);
1724         struct nfs4_exception exception = { };
1725         int err;
1726
1727         do {
1728                 err = _nfs4_open_expired(ctx, state);
1729                 switch (err) {
1730                 default:
1731                         goto out;
1732                 case -NFS4ERR_GRACE:
1733                 case -NFS4ERR_DELAY:
1734                         nfs4_handle_exception(server, err, &exception);
1735                         err = 0;
1736                 }
1737         } while (exception.retry);
1738 out:
1739         return err;
1740 }
1741
1742 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1743 {
1744         struct nfs_open_context *ctx;
1745         int ret;
1746
1747         ctx = nfs4_state_find_open_context(state);
1748         if (IS_ERR(ctx))
1749                 return PTR_ERR(ctx);
1750         ret = nfs4_do_open_expired(ctx, state);
1751         put_nfs_open_context(ctx);
1752         return ret;
1753 }
1754
1755 #if defined(CONFIG_NFS_V4_1)
1756 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1757 {
1758         struct nfs_server *server = NFS_SERVER(state->inode);
1759         nfs4_stateid *stateid = &state->stateid;
1760         int status;
1761
1762         /* If a state reset has been done, test_stateid is unneeded */
1763         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1764                 return;
1765
1766         status = nfs41_test_stateid(server, stateid);
1767         if (status != NFS_OK) {
1768                 /* Free the stateid unless the server explicitly
1769                  * informs us the stateid is unrecognized. */
1770                 if (status != -NFS4ERR_BAD_STATEID)
1771                         nfs41_free_stateid(server, stateid);
1772                 nfs_remove_bad_delegation(state->inode);
1773
1774                 write_seqlock(&state->seqlock);
1775                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1776                 write_sequnlock(&state->seqlock);
1777                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1778         }
1779 }
1780
1781 /**
1782  * nfs41_check_open_stateid - possibly free an open stateid
1783  *
1784  * @state: NFSv4 state for an inode
1785  *
1786  * Returns NFS_OK if recovery for this stateid is now finished.
1787  * Otherwise a negative NFS4ERR value is returned.
1788  */
1789 static int nfs41_check_open_stateid(struct nfs4_state *state)
1790 {
1791         struct nfs_server *server = NFS_SERVER(state->inode);
1792         nfs4_stateid *stateid = &state->open_stateid;
1793         int status;
1794
1795         /* If a state reset has been done, test_stateid is unneeded */
1796         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1797             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1798             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1799                 return -NFS4ERR_BAD_STATEID;
1800
1801         status = nfs41_test_stateid(server, stateid);
1802         if (status != NFS_OK) {
1803                 /* Free the stateid unless the server explicitly
1804                  * informs us the stateid is unrecognized. */
1805                 if (status != -NFS4ERR_BAD_STATEID)
1806                         nfs41_free_stateid(server, stateid);
1807
1808                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1809                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1810                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1811         }
1812         return status;
1813 }
1814
1815 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1816 {
1817         int status;
1818
1819         nfs41_clear_delegation_stateid(state);
1820         status = nfs41_check_open_stateid(state);
1821         if (status != NFS_OK)
1822                 status = nfs4_open_expired(sp, state);
1823         return status;
1824 }
1825 #endif
1826
1827 /*
1828  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1829  * fields corresponding to attributes that were used to store the verifier.
1830  * Make sure we clobber those fields in the later setattr call
1831  */
1832 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1833 {
1834         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1835             !(sattr->ia_valid & ATTR_ATIME_SET))
1836                 sattr->ia_valid |= ATTR_ATIME;
1837
1838         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1839             !(sattr->ia_valid & ATTR_MTIME_SET))
1840                 sattr->ia_valid |= ATTR_MTIME;
1841 }
1842
1843 /*
1844  * Returns a referenced nfs4_state
1845  */
1846 static int _nfs4_do_open(struct inode *dir,
1847                         struct dentry *dentry,
1848                         fmode_t fmode,
1849                         int flags,
1850                         struct iattr *sattr,
1851                         struct rpc_cred *cred,
1852                         struct nfs4_state **res,
1853                         struct nfs4_threshold **ctx_th)
1854 {
1855         struct nfs4_state_owner  *sp;
1856         struct nfs4_state     *state = NULL;
1857         struct nfs_server       *server = NFS_SERVER(dir);
1858         struct nfs4_opendata *opendata;
1859         int status;
1860
1861         /* Protect against reboot recovery conflicts */
1862         status = -ENOMEM;
1863         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1864         if (sp == NULL) {
1865                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1866                 goto out_err;
1867         }
1868         status = nfs4_recover_expired_lease(server);
1869         if (status != 0)
1870                 goto err_put_state_owner;
1871         if (dentry->d_inode != NULL)
1872                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1873         status = -ENOMEM;
1874         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1875         if (opendata == NULL)
1876                 goto err_put_state_owner;
1877
1878         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1879                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1880                 if (!opendata->f_attr.mdsthreshold)
1881                         goto err_opendata_put;
1882                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1883         }
1884         if (dentry->d_inode != NULL)
1885                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1886
1887         status = _nfs4_proc_open(opendata);
1888         if (status != 0)
1889                 goto err_opendata_put;
1890
1891         state = nfs4_opendata_to_nfs4_state(opendata);
1892         status = PTR_ERR(state);
1893         if (IS_ERR(state))
1894                 goto err_opendata_put;
1895         if (server->caps & NFS_CAP_POSIX_LOCK)
1896                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1897
1898         status = nfs4_opendata_access(cred, opendata, state, fmode);
1899         if (status != 0)
1900                 goto err_opendata_put;
1901
1902         if (opendata->o_arg.open_flags & O_EXCL) {
1903                 nfs4_exclusive_attrset(opendata, sattr);
1904
1905                 nfs_fattr_init(opendata->o_res.f_attr);
1906                 status = nfs4_do_setattr(state->inode, cred,
1907                                 opendata->o_res.f_attr, sattr,
1908                                 state);
1909                 if (status == 0)
1910                         nfs_setattr_update_inode(state->inode, sattr);
1911                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1912         }
1913
1914         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1915                 *ctx_th = opendata->f_attr.mdsthreshold;
1916         else
1917                 kfree(opendata->f_attr.mdsthreshold);
1918         opendata->f_attr.mdsthreshold = NULL;
1919
1920         nfs4_opendata_put(opendata);
1921         nfs4_put_state_owner(sp);
1922         *res = state;
1923         return 0;
1924 err_opendata_put:
1925         kfree(opendata->f_attr.mdsthreshold);
1926         nfs4_opendata_put(opendata);
1927 err_put_state_owner:
1928         nfs4_put_state_owner(sp);
1929 out_err:
1930         *res = NULL;
1931         return status;
1932 }
1933
1934
1935 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1936                                         struct dentry *dentry,
1937                                         fmode_t fmode,
1938                                         int flags,
1939                                         struct iattr *sattr,
1940                                         struct rpc_cred *cred,
1941                                         struct nfs4_threshold **ctx_th)
1942 {
1943         struct nfs4_exception exception = { };
1944         struct nfs4_state *res;
1945         int status;
1946
1947         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1948         do {
1949                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1950                                        &res, ctx_th);
1951                 if (status == 0)
1952                         break;
1953                 /* NOTE: BAD_SEQID means the server and client disagree about the
1954                  * book-keeping w.r.t. state-changing operations
1955                  * (OPEN/CLOSE/LOCK/LOCKU...)
1956                  * It is actually a sign of a bug on the client or on the server.
1957                  *
1958                  * If we receive a BAD_SEQID error in the particular case of
1959                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1960                  * have unhashed the old state_owner for us, and that we can
1961                  * therefore safely retry using a new one. We should still warn
1962                  * the user though...
1963                  */
1964                 if (status == -NFS4ERR_BAD_SEQID) {
1965                         pr_warn_ratelimited("NFS: v4 server %s "
1966                                         " returned a bad sequence-id error!\n",
1967                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1968                         exception.retry = 1;
1969                         continue;
1970                 }
1971                 /*
1972                  * BAD_STATEID on OPEN means that the server cancelled our
1973                  * state before it received the OPEN_CONFIRM.
1974                  * Recover by retrying the request as per the discussion
1975                  * on Page 181 of RFC3530.
1976                  */
1977                 if (status == -NFS4ERR_BAD_STATEID) {
1978                         exception.retry = 1;
1979                         continue;
1980                 }
1981                 if (status == -EAGAIN) {
1982                         /* We must have found a delegation */
1983                         exception.retry = 1;
1984                         continue;
1985                 }
1986                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1987                                         status, &exception));
1988         } while (exception.retry);
1989         return res;
1990 }
1991
1992 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1993                             struct nfs_fattr *fattr, struct iattr *sattr,
1994                             struct nfs4_state *state)
1995 {
1996         struct nfs_server *server = NFS_SERVER(inode);
1997         struct nfs_setattrargs  arg = {
1998                 .fh             = NFS_FH(inode),
1999                 .iap            = sattr,
2000                 .server         = server,
2001                 .bitmask = server->attr_bitmask,
2002         };
2003         struct nfs_setattrres  res = {
2004                 .fattr          = fattr,
2005                 .server         = server,
2006         };
2007         struct rpc_message msg = {
2008                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2009                 .rpc_argp       = &arg,
2010                 .rpc_resp       = &res,
2011                 .rpc_cred       = cred,
2012         };
2013         unsigned long timestamp = jiffies;
2014         int status;
2015
2016         nfs_fattr_init(fattr);
2017
2018         if (state != NULL) {
2019                 struct nfs_lockowner lockowner = {
2020                         .l_owner = current->files,
2021                         .l_pid = current->tgid,
2022                 };
2023                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2024                                 &lockowner);
2025         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2026                                 FMODE_WRITE)) {
2027                 /* Use that stateid */
2028         } else
2029                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2030
2031         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2032         if (status == 0 && state != NULL)
2033                 renew_lease(server, timestamp);
2034         return status;
2035 }
2036
2037 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2038                            struct nfs_fattr *fattr, struct iattr *sattr,
2039                            struct nfs4_state *state)
2040 {
2041         struct nfs_server *server = NFS_SERVER(inode);
2042         struct nfs4_exception exception = {
2043                 .state = state,
2044                 .inode = inode,
2045         };
2046         int err;
2047         do {
2048                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2049                 switch (err) {
2050                 case -NFS4ERR_OPENMODE:
2051                         if (state && !(state->state & FMODE_WRITE)) {
2052                                 err = -EBADF;
2053                                 if (sattr->ia_valid & ATTR_OPEN)
2054                                         err = -EACCES;
2055                                 goto out;
2056                         }
2057                 }
2058                 err = nfs4_handle_exception(server, err, &exception);
2059         } while (exception.retry);
2060 out:
2061         return err;
2062 }
2063
2064 struct nfs4_closedata {
2065         struct inode *inode;
2066         struct nfs4_state *state;
2067         struct nfs_closeargs arg;
2068         struct nfs_closeres res;
2069         struct nfs_fattr fattr;
2070         unsigned long timestamp;
2071         bool roc;
2072         u32 roc_barrier;
2073 };
2074
2075 static void nfs4_free_closedata(void *data)
2076 {
2077         struct nfs4_closedata *calldata = data;
2078         struct nfs4_state_owner *sp = calldata->state->owner;
2079         struct super_block *sb = calldata->state->inode->i_sb;
2080
2081         if (calldata->roc)
2082                 pnfs_roc_release(calldata->state->inode);
2083         nfs4_put_open_state(calldata->state);
2084         nfs_free_seqid(calldata->arg.seqid);
2085         nfs4_put_state_owner(sp);
2086         nfs_sb_deactive_async(sb);
2087         kfree(calldata);
2088 }
2089
2090 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2091                 fmode_t fmode)
2092 {
2093         spin_lock(&state->owner->so_lock);
2094         if (!(fmode & FMODE_READ))
2095                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2096         if (!(fmode & FMODE_WRITE))
2097                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2098         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2099         spin_unlock(&state->owner->so_lock);
2100 }
2101
2102 static void nfs4_close_done(struct rpc_task *task, void *data)
2103 {
2104         struct nfs4_closedata *calldata = data;
2105         struct nfs4_state *state = calldata->state;
2106         struct nfs_server *server = NFS_SERVER(calldata->inode);
2107
2108         dprintk("%s: begin!\n", __func__);
2109         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2110                 return;
2111         /* hmm. we are done with the inode, and in the process of freeing
2112          * the state_owner. we keep this around to process errors
2113          */
2114         switch (task->tk_status) {
2115                 case 0:
2116                         if (calldata->roc)
2117                                 pnfs_roc_set_barrier(state->inode,
2118                                                      calldata->roc_barrier);
2119                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2120                         renew_lease(server, calldata->timestamp);
2121                         nfs4_close_clear_stateid_flags(state,
2122                                         calldata->arg.fmode);
2123                         break;
2124                 case -NFS4ERR_STALE_STATEID:
2125                 case -NFS4ERR_OLD_STATEID:
2126                 case -NFS4ERR_BAD_STATEID:
2127                 case -NFS4ERR_EXPIRED:
2128                         if (calldata->arg.fmode == 0)
2129                                 break;
2130                 default:
2131                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2132                                 rpc_restart_call_prepare(task);
2133         }
2134         nfs_release_seqid(calldata->arg.seqid);
2135         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2136         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2137 }
2138
2139 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2140 {
2141         struct nfs4_closedata *calldata = data;
2142         struct nfs4_state *state = calldata->state;
2143         struct inode *inode = calldata->inode;
2144         int call_close = 0;
2145
2146         dprintk("%s: begin!\n", __func__);
2147         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2148                 return;
2149
2150         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2151         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2152         spin_lock(&state->owner->so_lock);
2153         /* Calculate the change in open mode */
2154         if (state->n_rdwr == 0) {
2155                 if (state->n_rdonly == 0) {
2156                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2157                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2158                         calldata->arg.fmode &= ~FMODE_READ;
2159                 }
2160                 if (state->n_wronly == 0) {
2161                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2162                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2163                         calldata->arg.fmode &= ~FMODE_WRITE;
2164                 }
2165         }
2166         spin_unlock(&state->owner->so_lock);
2167
2168         if (!call_close) {
2169                 /* Note: exit _without_ calling nfs4_close_done */
2170                 task->tk_action = NULL;
2171                 nfs4_sequence_done(task, &calldata->res.seq_res);
2172                 goto out;
2173         }
2174
2175         if (calldata->arg.fmode == 0) {
2176                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2177                 if (calldata->roc &&
2178                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2179                         goto out;
2180         }
2181
2182         nfs_fattr_init(calldata->res.fattr);
2183         calldata->timestamp = jiffies;
2184         if (nfs4_setup_sequence(NFS_SERVER(inode),
2185                                 &calldata->arg.seq_args,
2186                                 &calldata->res.seq_res,
2187                                 task) != 0)
2188                 nfs_release_seqid(calldata->arg.seqid);
2189 out:
2190         dprintk("%s: done!\n", __func__);
2191 }
2192
2193 static const struct rpc_call_ops nfs4_close_ops = {
2194         .rpc_call_prepare = nfs4_close_prepare,
2195         .rpc_call_done = nfs4_close_done,
2196         .rpc_release = nfs4_free_closedata,
2197 };
2198
2199 /*
2200  * It is possible for data to be read/written from a mem-mapped file
2201  * after the sys_close call (which hits the vfs layer as a flush).
2202  * This means that we can't safely call nfsv4 close on a file until
2203  * the inode is cleared. This in turn means that we are not good
2204  * NFSv4 citizens - we do not indicate to the server to update the file's
2205  * share state even when we are done with one of the three share
2206  * stateid's in the inode.
2207  *
2208  * NOTE: Caller must be holding the sp->so_owner semaphore!
2209  */
2210 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2211 {
2212         struct nfs_server *server = NFS_SERVER(state->inode);
2213         struct nfs4_closedata *calldata;
2214         struct nfs4_state_owner *sp = state->owner;
2215         struct rpc_task *task;
2216         struct rpc_message msg = {
2217                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2218                 .rpc_cred = state->owner->so_cred,
2219         };
2220         struct rpc_task_setup task_setup_data = {
2221                 .rpc_client = server->client,
2222                 .rpc_message = &msg,
2223                 .callback_ops = &nfs4_close_ops,
2224                 .workqueue = nfsiod_workqueue,
2225                 .flags = RPC_TASK_ASYNC,
2226         };
2227         int status = -ENOMEM;
2228
2229         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2230         if (calldata == NULL)
2231                 goto out;
2232         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2233         calldata->inode = state->inode;
2234         calldata->state = state;
2235         calldata->arg.fh = NFS_FH(state->inode);
2236         calldata->arg.stateid = &state->open_stateid;
2237         /* Serialization for the sequence id */
2238         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2239         if (calldata->arg.seqid == NULL)
2240                 goto out_free_calldata;
2241         calldata->arg.fmode = 0;
2242         calldata->arg.bitmask = server->cache_consistency_bitmask;
2243         calldata->res.fattr = &calldata->fattr;
2244         calldata->res.seqid = calldata->arg.seqid;
2245         calldata->res.server = server;
2246         calldata->roc = pnfs_roc(state->inode);
2247         nfs_sb_active(calldata->inode->i_sb);
2248
2249         msg.rpc_argp = &calldata->arg;
2250         msg.rpc_resp = &calldata->res;
2251         task_setup_data.callback_data = calldata;
2252         task = rpc_run_task(&task_setup_data);
2253         if (IS_ERR(task))
2254                 return PTR_ERR(task);
2255         status = 0;
2256         if (wait)
2257                 status = rpc_wait_for_completion_task(task);
2258         rpc_put_task(task);
2259         return status;
2260 out_free_calldata:
2261         kfree(calldata);
2262 out:
2263         nfs4_put_open_state(state);
2264         nfs4_put_state_owner(sp);
2265         return status;
2266 }
2267
2268 static struct inode *
2269 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2270 {
2271         struct nfs4_state *state;
2272
2273         /* Protect against concurrent sillydeletes */
2274         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2275                              ctx->cred, &ctx->mdsthreshold);
2276         if (IS_ERR(state))
2277                 return ERR_CAST(state);
2278         ctx->state = state;
2279         return igrab(state->inode);
2280 }
2281
2282 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2283 {
2284         if (ctx->state == NULL)
2285                 return;
2286         if (is_sync)
2287                 nfs4_close_sync(ctx->state, ctx->mode);
2288         else
2289                 nfs4_close_state(ctx->state, ctx->mode);
2290 }
2291
2292 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2293 {
2294         struct nfs4_server_caps_arg args = {
2295                 .fhandle = fhandle,
2296         };
2297         struct nfs4_server_caps_res res = {};
2298         struct rpc_message msg = {
2299                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2300                 .rpc_argp = &args,
2301                 .rpc_resp = &res,
2302         };
2303         int status;
2304
2305         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2306         if (status == 0) {
2307                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2308                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2309                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2310                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2311                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2312                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2313                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2314                         server->caps |= NFS_CAP_ACLS;
2315                 if (res.has_links != 0)
2316                         server->caps |= NFS_CAP_HARDLINKS;
2317                 if (res.has_symlinks != 0)
2318                         server->caps |= NFS_CAP_SYMLINKS;
2319                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2320                         server->caps |= NFS_CAP_FILEID;
2321                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2322                         server->caps |= NFS_CAP_MODE;
2323                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2324                         server->caps |= NFS_CAP_NLINK;
2325                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2326                         server->caps |= NFS_CAP_OWNER;
2327                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2328                         server->caps |= NFS_CAP_OWNER_GROUP;
2329                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2330                         server->caps |= NFS_CAP_ATIME;
2331                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2332                         server->caps |= NFS_CAP_CTIME;
2333                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2334                         server->caps |= NFS_CAP_MTIME;
2335
2336                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2337                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2338                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2339                 server->acl_bitmask = res.acl_bitmask;
2340                 server->fh_expire_type = res.fh_expire_type;
2341         }
2342
2343         return status;
2344 }
2345
2346 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2347 {
2348         struct nfs4_exception exception = { };
2349         int err;
2350         do {
2351                 err = nfs4_handle_exception(server,
2352                                 _nfs4_server_capabilities(server, fhandle),
2353                                 &exception);
2354         } while (exception.retry);
2355         return err;
2356 }
2357
2358 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2359                 struct nfs_fsinfo *info)
2360 {
2361         struct nfs4_lookup_root_arg args = {
2362                 .bitmask = nfs4_fattr_bitmap,
2363         };
2364         struct nfs4_lookup_res res = {
2365                 .server = server,
2366                 .fattr = info->fattr,
2367                 .fh = fhandle,
2368         };
2369         struct rpc_message msg = {
2370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2371                 .rpc_argp = &args,
2372                 .rpc_resp = &res,
2373         };
2374
2375         nfs_fattr_init(info->fattr);
2376         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2377 }
2378
2379 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2380                 struct nfs_fsinfo *info)
2381 {
2382         struct nfs4_exception exception = { };
2383         int err;
2384         do {
2385                 err = _nfs4_lookup_root(server, fhandle, info);
2386                 switch (err) {
2387                 case 0:
2388                 case -NFS4ERR_WRONGSEC:
2389                         goto out;
2390                 default:
2391                         err = nfs4_handle_exception(server, err, &exception);
2392                 }
2393         } while (exception.retry);
2394 out:
2395         return err;
2396 }
2397
2398 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2399                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2400 {
2401         struct rpc_auth *auth;
2402         int ret;
2403
2404         auth = rpcauth_create(flavor, server->client);
2405         if (IS_ERR(auth)) {
2406                 ret = -EIO;
2407                 goto out;
2408         }
2409         ret = nfs4_lookup_root(server, fhandle, info);
2410 out:
2411         return ret;
2412 }
2413
2414 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2415                               struct nfs_fsinfo *info)
2416 {
2417         int i, len, status = 0;
2418         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2419
2420         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2421         if (len < 0)
2422                 return len;
2423
2424         for (i = 0; i < len; i++) {
2425                 /* AUTH_UNIX is the default flavor if none was specified,
2426                  * thus has already been tried. */
2427                 if (flav_array[i] == RPC_AUTH_UNIX)
2428                         continue;
2429
2430                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2431                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2432                         continue;
2433                 break;
2434         }
2435         /*
2436          * -EACCESS could mean that the user doesn't have correct permissions
2437          * to access the mount.  It could also mean that we tried to mount
2438          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2439          * existing mount programs don't handle -EACCES very well so it should
2440          * be mapped to -EPERM instead.
2441          */
2442         if (status == -EACCES)
2443                 status = -EPERM;
2444         return status;
2445 }
2446
2447 /*
2448  * get the file handle for the "/" directory on the server
2449  */
2450 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2451                          struct nfs_fsinfo *info)
2452 {
2453         int minor_version = server->nfs_client->cl_minorversion;
2454         int status = nfs4_lookup_root(server, fhandle, info);
2455         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2456                 /*
2457                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2458                  * by nfs4_map_errors() as this function exits.
2459                  */
2460                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2461         if (status == 0)
2462                 status = nfs4_server_capabilities(server, fhandle);
2463         if (status == 0)
2464                 status = nfs4_do_fsinfo(server, fhandle, info);
2465         return nfs4_map_errors(status);
2466 }
2467
2468 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2469                               struct nfs_fsinfo *info)
2470 {
2471         int error;
2472         struct nfs_fattr *fattr = info->fattr;
2473
2474         error = nfs4_server_capabilities(server, mntfh);
2475         if (error < 0) {
2476                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2477                 return error;
2478         }
2479
2480         error = nfs4_proc_getattr(server, mntfh, fattr);
2481         if (error < 0) {
2482                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2483                 return error;
2484         }
2485
2486         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2487             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2488                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2489
2490         return error;
2491 }
2492
2493 /*
2494  * Get locations and (maybe) other attributes of a referral.
2495  * Note that we'll actually follow the referral later when
2496  * we detect fsid mismatch in inode revalidation
2497  */
2498 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2499                              const struct qstr *name, struct nfs_fattr *fattr,
2500                              struct nfs_fh *fhandle)
2501 {
2502         int status = -ENOMEM;
2503         struct page *page = NULL;
2504         struct nfs4_fs_locations *locations = NULL;
2505
2506         page = alloc_page(GFP_KERNEL);
2507         if (page == NULL)
2508                 goto out;
2509         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2510         if (locations == NULL)
2511                 goto out;
2512
2513         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2514         if (status != 0)
2515                 goto out;
2516         /* Make sure server returned a different fsid for the referral */
2517         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2518                 dprintk("%s: server did not return a different fsid for"
2519                         " a referral at %s\n", __func__, name->name);
2520                 status = -EIO;
2521                 goto out;
2522         }
2523         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2524         nfs_fixup_referral_attributes(&locations->fattr);
2525
2526         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2527         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2528         memset(fhandle, 0, sizeof(struct nfs_fh));
2529 out:
2530         if (page)
2531                 __free_page(page);
2532         kfree(locations);
2533         return status;
2534 }
2535
2536 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2537 {
2538         struct nfs4_getattr_arg args = {
2539                 .fh = fhandle,
2540                 .bitmask = server->attr_bitmask,
2541         };
2542         struct nfs4_getattr_res res = {
2543                 .fattr = fattr,
2544                 .server = server,
2545         };
2546         struct rpc_message msg = {
2547                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2548                 .rpc_argp = &args,
2549                 .rpc_resp = &res,
2550         };
2551
2552         nfs_fattr_init(fattr);
2553         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2554 }
2555
2556 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2557 {
2558         struct nfs4_exception exception = { };
2559         int err;
2560         do {
2561                 err = nfs4_handle_exception(server,
2562                                 _nfs4_proc_getattr(server, fhandle, fattr),
2563                                 &exception);
2564         } while (exception.retry);
2565         return err;
2566 }
2567
2568 /*
2569  * The file is not closed if it is opened due to the a request to change
2570  * the size of the file. The open call will not be needed once the
2571  * VFS layer lookup-intents are implemented.
2572  *
2573  * Close is called when the inode is destroyed.
2574  * If we haven't opened the file for O_WRONLY, we
2575  * need to in the size_change case to obtain a stateid.
2576  *
2577  * Got race?
2578  * Because OPEN is always done by name in nfsv4, it is
2579  * possible that we opened a different file by the same
2580  * name.  We can recognize this race condition, but we
2581  * can't do anything about it besides returning an error.
2582  *
2583  * This will be fixed with VFS changes (lookup-intent).
2584  */
2585 static int
2586 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2587                   struct iattr *sattr)
2588 {
2589         struct inode *inode = dentry->d_inode;
2590         struct rpc_cred *cred = NULL;
2591         struct nfs4_state *state = NULL;
2592         int status;
2593
2594         if (pnfs_ld_layoutret_on_setattr(inode))
2595                 pnfs_return_layout(inode);
2596
2597         nfs_fattr_init(fattr);
2598
2599         /* Deal with open(O_TRUNC) */
2600         if (sattr->ia_valid & ATTR_OPEN)
2601                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2602
2603         /* Optimization: if the end result is no change, don't RPC */
2604         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2605                 return 0;
2606
2607         /* Search for an existing open(O_WRITE) file */
2608         if (sattr->ia_valid & ATTR_FILE) {
2609                 struct nfs_open_context *ctx;
2610
2611                 ctx = nfs_file_open_context(sattr->ia_file);
2612                 if (ctx) {
2613                         cred = ctx->cred;
2614                         state = ctx->state;
2615                 }
2616         }
2617
2618         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2619         if (status == 0)
2620                 nfs_setattr_update_inode(inode, sattr);
2621         return status;
2622 }
2623
2624 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2625                 const struct qstr *name, struct nfs_fh *fhandle,
2626                 struct nfs_fattr *fattr)
2627 {
2628         struct nfs_server *server = NFS_SERVER(dir);
2629         int                    status;
2630         struct nfs4_lookup_arg args = {
2631                 .bitmask = server->attr_bitmask,
2632                 .dir_fh = NFS_FH(dir),
2633                 .name = name,
2634         };
2635         struct nfs4_lookup_res res = {
2636                 .server = server,
2637                 .fattr = fattr,
2638                 .fh = fhandle,
2639         };
2640         struct rpc_message msg = {
2641                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2642                 .rpc_argp = &args,
2643                 .rpc_resp = &res,
2644         };
2645
2646         nfs_fattr_init(fattr);
2647
2648         dprintk("NFS call  lookup %s\n", name->name);
2649         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2650         dprintk("NFS reply lookup: %d\n", status);
2651         return status;
2652 }
2653
2654 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2655 {
2656         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2657                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2658         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2659         fattr->nlink = 2;
2660 }
2661
2662 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2663                                    struct qstr *name, struct nfs_fh *fhandle,
2664                                    struct nfs_fattr *fattr)
2665 {
2666         struct nfs4_exception exception = { };
2667         struct rpc_clnt *client = *clnt;
2668         int err;
2669         do {
2670                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2671                 switch (err) {
2672                 case -NFS4ERR_BADNAME:
2673                         err = -ENOENT;
2674                         goto out;
2675                 case -NFS4ERR_MOVED:
2676                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2677                         goto out;
2678                 case -NFS4ERR_WRONGSEC:
2679                         err = -EPERM;
2680                         if (client != *clnt)
2681                                 goto out;
2682
2683                         client = nfs4_create_sec_client(client, dir, name);
2684                         if (IS_ERR(client))
2685                                 return PTR_ERR(client);
2686
2687                         exception.retry = 1;
2688                         break;
2689                 default:
2690                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2691                 }
2692         } while (exception.retry);
2693
2694 out:
2695         if (err == 0)
2696                 *clnt = client;
2697         else if (client != *clnt)
2698                 rpc_shutdown_client(client);
2699
2700         return err;
2701 }
2702
2703 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2704                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2705 {
2706         int status;
2707         struct rpc_clnt *client = NFS_CLIENT(dir);
2708
2709         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2710         if (client != NFS_CLIENT(dir)) {
2711                 rpc_shutdown_client(client);
2712                 nfs_fixup_secinfo_attributes(fattr);
2713         }
2714         return status;
2715 }
2716
2717 struct rpc_clnt *
2718 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2719                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2720 {
2721         int status;
2722         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2723
2724         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2725         if (status < 0) {
2726                 rpc_shutdown_client(client);
2727                 return ERR_PTR(status);
2728         }
2729         return client;
2730 }
2731
2732 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2733 {
2734         struct nfs_server *server = NFS_SERVER(inode);
2735         struct nfs4_accessargs args = {
2736                 .fh = NFS_FH(inode),
2737                 .bitmask = server->cache_consistency_bitmask,
2738         };
2739         struct nfs4_accessres res = {
2740                 .server = server,
2741         };
2742         struct rpc_message msg = {
2743                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2744                 .rpc_argp = &args,
2745                 .rpc_resp = &res,
2746                 .rpc_cred = entry->cred,
2747         };
2748         int mode = entry->mask;
2749         int status;
2750
2751         /*
2752          * Determine which access bits we want to ask for...
2753          */
2754         if (mode & MAY_READ)
2755                 args.access |= NFS4_ACCESS_READ;
2756         if (S_ISDIR(inode->i_mode)) {
2757                 if (mode & MAY_WRITE)
2758                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2759                 if (mode & MAY_EXEC)
2760                         args.access |= NFS4_ACCESS_LOOKUP;
2761         } else {
2762                 if (mode & MAY_WRITE)
2763                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2764                 if (mode & MAY_EXEC)
2765                         args.access |= NFS4_ACCESS_EXECUTE;
2766         }
2767
2768         res.fattr = nfs_alloc_fattr();
2769         if (res.fattr == NULL)
2770                 return -ENOMEM;
2771
2772         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2773         if (!status) {
2774                 nfs_access_set_mask(entry, res.access);
2775                 nfs_refresh_inode(inode, res.fattr);
2776         }
2777         nfs_free_fattr(res.fattr);
2778         return status;
2779 }
2780
2781 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2782 {
2783         struct nfs4_exception exception = { };
2784         int err;
2785         do {
2786                 err = nfs4_handle_exception(NFS_SERVER(inode),
2787                                 _nfs4_proc_access(inode, entry),
2788                                 &exception);
2789         } while (exception.retry);
2790         return err;
2791 }
2792
2793 /*
2794  * TODO: For the time being, we don't try to get any attributes
2795  * along with any of the zero-copy operations READ, READDIR,
2796  * READLINK, WRITE.
2797  *
2798  * In the case of the first three, we want to put the GETATTR
2799  * after the read-type operation -- this is because it is hard
2800  * to predict the length of a GETATTR response in v4, and thus
2801  * align the READ data correctly.  This means that the GETATTR
2802  * may end up partially falling into the page cache, and we should
2803  * shift it into the 'tail' of the xdr_buf before processing.
2804  * To do this efficiently, we need to know the total length
2805  * of data received, which doesn't seem to be available outside
2806  * of the RPC layer.
2807  *
2808  * In the case of WRITE, we also want to put the GETATTR after
2809  * the operation -- in this case because we want to make sure
2810  * we get the post-operation mtime and size.
2811  *
2812  * Both of these changes to the XDR layer would in fact be quite
2813  * minor, but I decided to leave them for a subsequent patch.
2814  */
2815 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2816                 unsigned int pgbase, unsigned int pglen)
2817 {
2818         struct nfs4_readlink args = {
2819                 .fh       = NFS_FH(inode),
2820                 .pgbase   = pgbase,
2821                 .pglen    = pglen,
2822                 .pages    = &page,
2823         };
2824         struct nfs4_readlink_res res;
2825         struct rpc_message msg = {
2826                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2827                 .rpc_argp = &args,
2828                 .rpc_resp = &res,
2829         };
2830
2831         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2832 }
2833
2834 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2835                 unsigned int pgbase, unsigned int pglen)
2836 {
2837         struct nfs4_exception exception = { };
2838         int err;
2839         do {
2840                 err = nfs4_handle_exception(NFS_SERVER(inode),
2841                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2842                                 &exception);
2843         } while (exception.retry);
2844         return err;
2845 }
2846
2847 /*
2848  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2849  */
2850 static int
2851 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2852                  int flags)
2853 {
2854         struct nfs_open_context *ctx;
2855         struct nfs4_state *state;
2856         int status = 0;
2857
2858         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2859         if (IS_ERR(ctx))
2860                 return PTR_ERR(ctx);
2861
2862         sattr->ia_mode &= ~current_umask();
2863         state = nfs4_do_open(dir, dentry, ctx->mode,
2864                         flags, sattr, ctx->cred,
2865                         &ctx->mdsthreshold);
2866         d_drop(dentry);
2867         if (IS_ERR(state)) {
2868                 status = PTR_ERR(state);
2869                 goto out;
2870         }
2871         d_add(dentry, igrab(state->inode));
2872         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2873         ctx->state = state;
2874 out:
2875         put_nfs_open_context(ctx);
2876         return status;
2877 }
2878
2879 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2880 {
2881         struct nfs_server *server = NFS_SERVER(dir);
2882         struct nfs_removeargs args = {
2883                 .fh = NFS_FH(dir),
2884                 .name = *name,
2885         };
2886         struct nfs_removeres res = {
2887                 .server = server,
2888         };
2889         struct rpc_message msg = {
2890                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2891                 .rpc_argp = &args,
2892                 .rpc_resp = &res,
2893         };
2894         int status;
2895
2896         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2897         if (status == 0)
2898                 update_changeattr(dir, &res.cinfo);
2899         return status;
2900 }
2901
2902 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2903 {
2904         struct nfs4_exception exception = { };
2905         int err;
2906         do {
2907                 err = nfs4_handle_exception(NFS_SERVER(dir),
2908                                 _nfs4_proc_remove(dir, name),
2909                                 &exception);
2910         } while (exception.retry);
2911         return err;
2912 }
2913
2914 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2915 {
2916         struct nfs_server *server = NFS_SERVER(dir);
2917         struct nfs_removeargs *args = msg->rpc_argp;
2918         struct nfs_removeres *res = msg->rpc_resp;
2919
2920         res->server = server;
2921         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2922         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2923 }
2924
2925 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2926 {
2927         nfs4_setup_sequence(NFS_SERVER(data->dir),
2928                         &data->args.seq_args,
2929                         &data->res.seq_res,
2930                         task);
2931 }
2932
2933 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2934 {
2935         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2936
2937         if (!nfs4_sequence_done(task, &res->seq_res))
2938                 return 0;
2939         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2940                 return 0;
2941         update_changeattr(dir, &res->cinfo);
2942         return 1;
2943 }
2944
2945 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2946 {
2947         struct nfs_server *server = NFS_SERVER(dir);
2948         struct nfs_renameargs *arg = msg->rpc_argp;
2949         struct nfs_renameres *res = msg->rpc_resp;
2950
2951         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2952         res->server = server;
2953         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2954 }
2955
2956 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2957 {
2958         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2959                         &data->args.seq_args,
2960                         &data->res.seq_res,
2961                         task);
2962 }
2963
2964 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2965                                  struct inode *new_dir)
2966 {
2967         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2968
2969         if (!nfs4_sequence_done(task, &res->seq_res))
2970                 return 0;
2971         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2972                 return 0;
2973
2974         update_changeattr(old_dir, &res->old_cinfo);
2975         update_changeattr(new_dir, &res->new_cinfo);
2976         return 1;
2977 }
2978
2979 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2980                 struct inode *new_dir, struct qstr *new_name)
2981 {
2982         struct nfs_server *server = NFS_SERVER(old_dir);
2983         struct nfs_renameargs arg = {
2984                 .old_dir = NFS_FH(old_dir),
2985                 .new_dir = NFS_FH(new_dir),
2986                 .old_name = old_name,
2987                 .new_name = new_name,
2988         };
2989         struct nfs_renameres res = {
2990                 .server = server,
2991         };
2992         struct rpc_message msg = {
2993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2994                 .rpc_argp = &arg,
2995                 .rpc_resp = &res,
2996         };
2997         int status = -ENOMEM;
2998
2999         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3000         if (!status) {
3001                 update_changeattr(old_dir, &res.old_cinfo);
3002                 update_changeattr(new_dir, &res.new_cinfo);
3003         }
3004         return status;
3005 }
3006
3007 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3008                 struct inode *new_dir, struct qstr *new_name)
3009 {
3010         struct nfs4_exception exception = { };
3011         int err;
3012         do {
3013                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3014                                 _nfs4_proc_rename(old_dir, old_name,
3015                                         new_dir, new_name),
3016                                 &exception);
3017         } while (exception.retry);
3018         return err;
3019 }
3020
3021 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3022 {
3023         struct nfs_server *server = NFS_SERVER(inode);
3024         struct nfs4_link_arg arg = {
3025                 .fh     = NFS_FH(inode),
3026                 .dir_fh = NFS_FH(dir),
3027                 .name   = name,
3028                 .bitmask = server->attr_bitmask,
3029         };
3030         struct nfs4_link_res res = {
3031                 .server = server,
3032         };
3033         struct rpc_message msg = {
3034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3035                 .rpc_argp = &arg,
3036                 .rpc_resp = &res,
3037         };
3038         int status = -ENOMEM;
3039
3040         res.fattr = nfs_alloc_fattr();
3041         if (res.fattr == NULL)
3042                 goto out;
3043
3044         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3045         if (!status) {
3046                 update_changeattr(dir, &res.cinfo);
3047                 nfs_post_op_update_inode(inode, res.fattr);
3048         }
3049 out:
3050         nfs_free_fattr(res.fattr);
3051         return status;
3052 }
3053
3054 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3055 {
3056         struct nfs4_exception exception = { };
3057         int err;
3058         do {
3059                 err = nfs4_handle_exception(NFS_SERVER(inode),
3060                                 _nfs4_proc_link(inode, dir, name),
3061                                 &exception);
3062         } while (exception.retry);
3063         return err;
3064 }
3065
3066 struct nfs4_createdata {
3067         struct rpc_message msg;
3068         struct nfs4_create_arg arg;
3069         struct nfs4_create_res res;
3070         struct nfs_fh fh;
3071         struct nfs_fattr fattr;
3072 };
3073
3074 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3075                 struct qstr *name, struct iattr *sattr, u32 ftype)
3076 {
3077         struct nfs4_createdata *data;
3078
3079         data = kzalloc(sizeof(*data), GFP_KERNEL);
3080         if (data != NULL) {
3081                 struct nfs_server *server = NFS_SERVER(dir);
3082
3083                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3084                 data->msg.rpc_argp = &data->arg;
3085                 data->msg.rpc_resp = &data->res;
3086                 data->arg.dir_fh = NFS_FH(dir);
3087                 data->arg.server = server;
3088                 data->arg.name = name;
3089                 data->arg.attrs = sattr;
3090                 data->arg.ftype = ftype;
3091                 data->arg.bitmask = server->attr_bitmask;
3092                 data->res.server = server;
3093                 data->res.fh = &data->fh;
3094                 data->res.fattr = &data->fattr;
3095                 nfs_fattr_init(data->res.fattr);
3096         }
3097         return data;
3098 }
3099
3100 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3101 {
3102         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3103                                     &data->arg.seq_args, &data->res.seq_res, 1);
3104         if (status == 0) {
3105                 update_changeattr(dir, &data->res.dir_cinfo);
3106                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3107         }
3108         return status;
3109 }
3110
3111 static void nfs4_free_createdata(struct nfs4_createdata *data)
3112 {
3113         kfree(data);
3114 }
3115
3116 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3117                 struct page *page, unsigned int len, struct iattr *sattr)
3118 {
3119         struct nfs4_createdata *data;
3120         int status = -ENAMETOOLONG;
3121
3122         if (len > NFS4_MAXPATHLEN)
3123                 goto out;
3124
3125         status = -ENOMEM;
3126         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3127         if (data == NULL)
3128                 goto out;
3129
3130         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3131         data->arg.u.symlink.pages = &page;
3132         data->arg.u.symlink.len = len;
3133
3134         status = nfs4_do_create(dir, dentry, data);
3135
3136         nfs4_free_createdata(data);
3137 out:
3138         return status;
3139 }
3140
3141 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3142                 struct page *page, unsigned int len, struct iattr *sattr)
3143 {
3144         struct nfs4_exception exception = { };
3145         int err;
3146         do {
3147                 err = nfs4_handle_exception(NFS_SERVER(dir),
3148                                 _nfs4_proc_symlink(dir, dentry, page,
3149                                                         len, sattr),
3150                                 &exception);
3151         } while (exception.retry);
3152         return err;
3153 }
3154
3155 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3156                 struct iattr *sattr)
3157 {
3158         struct nfs4_createdata *data;
3159         int status = -ENOMEM;
3160
3161         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3162         if (data == NULL)
3163                 goto out;
3164
3165         status = nfs4_do_create(dir, dentry, data);
3166
3167         nfs4_free_createdata(data);
3168 out:
3169         return status;
3170 }
3171
3172 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3173                 struct iattr *sattr)
3174 {
3175         struct nfs4_exception exception = { };
3176         int err;
3177
3178         sattr->ia_mode &= ~current_umask();
3179         do {
3180                 err = nfs4_handle_exception(NFS_SERVER(dir),
3181                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3182                                 &exception);
3183         } while (exception.retry);
3184         return err;
3185 }
3186
3187 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3188                 u64 cookie, struct page **pages, unsigned int count, int plus)
3189 {
3190         struct inode            *dir = dentry->d_inode;
3191         struct nfs4_readdir_arg args = {
3192                 .fh = NFS_FH(dir),
3193                 .pages = pages,
3194                 .pgbase = 0,
3195                 .count = count,
3196                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3197                 .plus = plus,
3198         };
3199         struct nfs4_readdir_res res;
3200         struct rpc_message msg = {
3201                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3202                 .rpc_argp = &args,
3203                 .rpc_resp = &res,
3204                 .rpc_cred = cred,
3205         };
3206         int                     status;
3207
3208         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3209                         dentry->d_parent->d_name.name,
3210                         dentry->d_name.name,
3211                         (unsigned long long)cookie);
3212         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3213         res.pgbase = args.pgbase;
3214         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3215         if (status >= 0) {
3216                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3217                 status += args.pgbase;
3218         }
3219
3220         nfs_invalidate_atime(dir);
3221
3222         dprintk("%s: returns %d\n", __func__, status);
3223         return status;
3224 }
3225
3226 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3227                 u64 cookie, struct page **pages, unsigned int count, int plus)
3228 {
3229         struct nfs4_exception exception = { };
3230         int err;
3231         do {
3232                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3233                                 _nfs4_proc_readdir(dentry, cred, cookie,
3234                                         pages, count, plus),
3235                                 &exception);
3236         } while (exception.retry);
3237         return err;
3238 }
3239
3240 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3241                 struct iattr *sattr, dev_t rdev)
3242 {
3243         struct nfs4_createdata *data;
3244         int mode = sattr->ia_mode;
3245         int status = -ENOMEM;
3246
3247         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3248         if (data == NULL)
3249                 goto out;
3250
3251         if (S_ISFIFO(mode))
3252                 data->arg.ftype = NF4FIFO;
3253         else if (S_ISBLK(mode)) {
3254                 data->arg.ftype = NF4BLK;
3255                 data->arg.u.device.specdata1 = MAJOR(rdev);
3256                 data->arg.u.device.specdata2 = MINOR(rdev);
3257         }
3258         else if (S_ISCHR(mode)) {
3259                 data->arg.ftype = NF4CHR;
3260                 data->arg.u.device.specdata1 = MAJOR(rdev);
3261                 data->arg.u.device.specdata2 = MINOR(rdev);
3262         } else if (!S_ISSOCK(mode)) {
3263                 status = -EINVAL;
3264                 goto out_free;
3265         }
3266
3267         status = nfs4_do_create(dir, dentry, data);
3268 out_free:
3269         nfs4_free_createdata(data);
3270 out:
3271         return status;
3272 }
3273
3274 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3275                 struct iattr *sattr, dev_t rdev)
3276 {
3277         struct nfs4_exception exception = { };
3278         int err;
3279
3280         sattr->ia_mode &= ~current_umask();
3281         do {
3282                 err = nfs4_handle_exception(NFS_SERVER(dir),
3283                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3284                                 &exception);
3285         } while (exception.retry);
3286         return err;
3287 }
3288
3289 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3290                  struct nfs_fsstat *fsstat)
3291 {
3292         struct nfs4_statfs_arg args = {
3293                 .fh = fhandle,
3294                 .bitmask = server->attr_bitmask,
3295         };
3296         struct nfs4_statfs_res res = {
3297                 .fsstat = fsstat,
3298         };
3299         struct rpc_message msg = {
3300                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3301                 .rpc_argp = &args,
3302                 .rpc_resp = &res,
3303         };
3304
3305         nfs_fattr_init(fsstat->fattr);
3306         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3307 }
3308
3309 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3310 {
3311         struct nfs4_exception exception = { };
3312         int err;
3313         do {
3314                 err = nfs4_handle_exception(server,
3315                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3316                                 &exception);
3317         } while (exception.retry);
3318         return err;
3319 }
3320
3321 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3322                 struct nfs_fsinfo *fsinfo)
3323 {
3324         struct nfs4_fsinfo_arg args = {
3325                 .fh = fhandle,
3326                 .bitmask = server->attr_bitmask,
3327         };
3328         struct nfs4_fsinfo_res res = {
3329                 .fsinfo = fsinfo,
3330         };
3331         struct rpc_message msg = {
3332                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3333                 .rpc_argp = &args,
3334                 .rpc_resp = &res,
3335         };
3336
3337         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3338 }
3339
3340 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3341 {
3342         struct nfs4_exception exception = { };
3343         int err;
3344
3345         do {
3346                 err = nfs4_handle_exception(server,
3347                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3348                                 &exception);
3349         } while (exception.retry);
3350         return err;
3351 }
3352
3353 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3354 {
3355         int error;
3356
3357         nfs_fattr_init(fsinfo->fattr);
3358         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3359         if (error == 0) {
3360                 /* block layout checks this! */
3361                 server->pnfs_blksize = fsinfo->blksize;
3362                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3363         }
3364
3365         return error;
3366 }
3367
3368 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3369                 struct nfs_pathconf *pathconf)
3370 {
3371         struct nfs4_pathconf_arg args = {
3372                 .fh = fhandle,
3373                 .bitmask = server->attr_bitmask,
3374         };
3375         struct nfs4_pathconf_res res = {
3376                 .pathconf = pathconf,
3377         };
3378         struct rpc_message msg = {
3379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3380                 .rpc_argp = &args,
3381                 .rpc_resp = &res,
3382         };
3383
3384         /* None of the pathconf attributes are mandatory to implement */
3385         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3386                 memset(pathconf, 0, sizeof(*pathconf));
3387                 return 0;
3388         }
3389
3390         nfs_fattr_init(pathconf->fattr);
3391         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3392 }
3393
3394 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3395                 struct nfs_pathconf *pathconf)
3396 {
3397         struct nfs4_exception exception = { };
3398         int err;
3399
3400         do {
3401                 err = nfs4_handle_exception(server,
3402                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3403                                 &exception);
3404         } while (exception.retry);
3405         return err;
3406 }
3407
3408 void __nfs4_read_done_cb(struct nfs_read_data *data)
3409 {
3410         nfs_invalidate_atime(data->header->inode);
3411 }
3412
3413 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3414 {
3415         struct nfs_server *server = NFS_SERVER(data->header->inode);
3416
3417         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3418                 rpc_restart_call_prepare(task);
3419                 return -EAGAIN;
3420         }
3421
3422         __nfs4_read_done_cb(data);
3423         if (task->tk_status > 0)
3424                 renew_lease(server, data->timestamp);
3425         return 0;
3426 }
3427
3428 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3429 {
3430
3431         dprintk("--> %s\n", __func__);
3432
3433         if (!nfs4_sequence_done(task, &data->res.seq_res))
3434                 return -EAGAIN;
3435
3436         return data->read_done_cb ? data->read_done_cb(task, data) :
3437                                     nfs4_read_done_cb(task, data);
3438 }
3439
3440 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3441 {
3442         data->timestamp   = jiffies;
3443         data->read_done_cb = nfs4_read_done_cb;
3444         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3445         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3446 }
3447
3448 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3449 {
3450         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3451                         &data->args.seq_args,
3452                         &data->res.seq_res,
3453                         task);
3454 }
3455
3456 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3457 {
3458         struct inode *inode = data->header->inode;
3459
3460         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3461                 rpc_restart_call_prepare(task);
3462                 return -EAGAIN;
3463         }
3464         if (task->tk_status >= 0) {
3465                 renew_lease(NFS_SERVER(inode), data->timestamp);
3466                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3467         }
3468         return 0;
3469 }
3470
3471 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3472 {
3473         if (!nfs4_sequence_done(task, &data->res.seq_res))
3474                 return -EAGAIN;
3475         return data->write_done_cb ? data->write_done_cb(task, data) :
3476                 nfs4_write_done_cb(task, data);
3477 }
3478
3479 static
3480 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3481 {
3482         const struct nfs_pgio_header *hdr = data->header;
3483
3484         /* Don't request attributes for pNFS or O_DIRECT writes */
3485         if (data->ds_clp != NULL || hdr->dreq != NULL)
3486                 return false;
3487         /* Otherwise, request attributes if and only if we don't hold
3488          * a delegation
3489          */
3490         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3491 }
3492
3493 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3494 {
3495         struct nfs_server *server = NFS_SERVER(data->header->inode);
3496
3497         if (!nfs4_write_need_cache_consistency_data(data)) {
3498                 data->args.bitmask = NULL;
3499                 data->res.fattr = NULL;
3500         } else
3501                 data->args.bitmask = server->cache_consistency_bitmask;
3502
3503         if (!data->write_done_cb)
3504                 data->write_done_cb = nfs4_write_done_cb;
3505         data->res.server = server;
3506         data->timestamp   = jiffies;
3507
3508         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3509         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3510 }
3511
3512 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3513 {
3514         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3515                         &data->args.seq_args,
3516                         &data->res.seq_res,
3517                         task);
3518 }
3519
3520 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3521 {
3522         nfs4_setup_sequence(NFS_SERVER(data->inode),
3523                         &data->args.seq_args,
3524                         &data->res.seq_res,
3525                         task);
3526 }
3527
3528 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3529 {
3530         struct inode *inode = data->inode;
3531
3532         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3533                 rpc_restart_call_prepare(task);
3534                 return -EAGAIN;
3535         }
3536         return 0;
3537 }
3538
3539 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3540 {
3541         if (!nfs4_sequence_done(task, &data->res.seq_res))
3542                 return -EAGAIN;
3543         return data->commit_done_cb(task, data);
3544 }
3545
3546 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3547 {
3548         struct nfs_server *server = NFS_SERVER(data->inode);
3549
3550         if (data->commit_done_cb == NULL)
3551                 data->commit_done_cb = nfs4_commit_done_cb;
3552         data->res.server = server;
3553         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3554         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3555 }
3556
3557 struct nfs4_renewdata {
3558         struct nfs_client       *client;
3559         unsigned long           timestamp;
3560 };
3561
3562 /*
3563  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3564  * standalone procedure for queueing an asynchronous RENEW.
3565  */
3566 static void nfs4_renew_release(void *calldata)
3567 {
3568         struct nfs4_renewdata *data = calldata;
3569         struct nfs_client *clp = data->client;
3570
3571         if (atomic_read(&clp->cl_count) > 1)
3572                 nfs4_schedule_state_renewal(clp);
3573         nfs_put_client(clp);
3574         kfree(data);
3575 }
3576
3577 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3578 {
3579         struct nfs4_renewdata *data = calldata;
3580         struct nfs_client *clp = data->client;
3581         unsigned long timestamp = data->timestamp;
3582
3583         if (task->tk_status < 0) {
3584                 /* Unless we're shutting down, schedule state recovery! */
3585                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3586                         return;
3587                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3588                         nfs4_schedule_lease_recovery(clp);
3589                         return;
3590                 }
3591                 nfs4_schedule_path_down_recovery(clp);
3592         }
3593         do_renew_lease(clp, timestamp);
3594 }
3595
3596 static const struct rpc_call_ops nfs4_renew_ops = {
3597         .rpc_call_done = nfs4_renew_done,
3598         .rpc_release = nfs4_renew_release,
3599 };
3600
3601 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3602 {
3603         struct rpc_message msg = {
3604                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3605                 .rpc_argp       = clp,
3606                 .rpc_cred       = cred,
3607         };
3608         struct nfs4_renewdata *data;
3609
3610         if (renew_flags == 0)
3611                 return 0;
3612         if (!atomic_inc_not_zero(&clp->cl_count))
3613                 return -EIO;
3614         data = kmalloc(sizeof(*data), GFP_NOFS);
3615         if (data == NULL)
3616                 return -ENOMEM;
3617         data->client = clp;
3618         data->timestamp = jiffies;
3619         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3620                         &nfs4_renew_ops, data);
3621 }
3622
3623 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3624 {
3625         struct rpc_message msg = {
3626                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3627                 .rpc_argp       = clp,
3628                 .rpc_cred       = cred,
3629         };
3630         unsigned long now = jiffies;
3631         int status;
3632
3633         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3634         if (status < 0)
3635                 return status;
3636         do_renew_lease(clp, now);
3637         return 0;
3638 }
3639
3640 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3641 {
3642         return (server->caps & NFS_CAP_ACLS)
3643                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3644                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3645 }
3646
3647 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3648  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3649  * the stack.
3650  */
3651 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3652
3653 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3654                 struct page **pages, unsigned int *pgbase)
3655 {
3656         struct page *newpage, **spages;
3657         int rc = 0;
3658         size_t len;
3659         spages = pages;
3660
3661         do {
3662                 len = min_t(size_t, PAGE_SIZE, buflen);
3663                 newpage = alloc_page(GFP_KERNEL);
3664
3665                 if (newpage == NULL)
3666                         goto unwind;
3667                 memcpy(page_address(newpage), buf, len);
3668                 buf += len;
3669                 buflen -= len;
3670                 *pages++ = newpage;
3671                 rc++;
3672         } while (buflen != 0);
3673
3674         return rc;
3675
3676 unwind:
3677         for(; rc > 0; rc--)
3678                 __free_page(spages[rc-1]);
3679         return -ENOMEM;
3680 }
3681
3682 struct nfs4_cached_acl {
3683         int cached;
3684         size_t len;
3685         char data[0];
3686 };
3687
3688 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3689 {
3690         struct nfs_inode *nfsi = NFS_I(inode);
3691
3692         spin_lock(&inode->i_lock);
3693         kfree(nfsi->nfs4_acl);
3694         nfsi->nfs4_acl = acl;
3695         spin_unlock(&inode->i_lock);
3696 }
3697
3698 static void nfs4_zap_acl_attr(struct inode *inode)
3699 {
3700         nfs4_set_cached_acl(inode, NULL);
3701 }
3702
3703 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3704 {
3705         struct nfs_inode *nfsi = NFS_I(inode);
3706         struct nfs4_cached_acl *acl;
3707         int ret = -ENOENT;
3708
3709         spin_lock(&inode->i_lock);
3710         acl = nfsi->nfs4_acl;
3711         if (acl == NULL)
3712                 goto out;
3713         if (buf == NULL) /* user is just asking for length */
3714                 goto out_len;
3715         if (acl->cached == 0)
3716                 goto out;
3717         ret = -ERANGE; /* see getxattr(2) man page */
3718         if (acl->len > buflen)
3719                 goto out;
3720         memcpy(buf, acl->data, acl->len);
3721 out_len:
3722         ret = acl->len;
3723 out:
3724         spin_unlock(&inode->i_lock);
3725         return ret;
3726 }
3727
3728 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3729 {
3730         struct nfs4_cached_acl *acl;
3731         size_t buflen = sizeof(*acl) + acl_len;
3732
3733         if (buflen <= PAGE_SIZE) {
3734                 acl = kmalloc(buflen, GFP_KERNEL);
3735                 if (acl == NULL)
3736                         goto out;
3737                 acl->cached = 1;
3738                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3739         } else {
3740                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3741                 if (acl == NULL)
3742                         goto out;
3743                 acl->cached = 0;
3744         }
3745         acl->len = acl_len;
3746 out:
3747         nfs4_set_cached_acl(inode, acl);
3748 }
3749
3750 /*
3751  * The getxattr API returns the required buffer length when called with a
3752  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3753  * the required buf.  On a NULL buf, we send a page of data to the server
3754  * guessing that the ACL request can be serviced by a page. If so, we cache
3755  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3756  * the cache. If not so, we throw away the page, and cache the required
3757  * length. The next getxattr call will then produce another round trip to
3758  * the server, this time with the input buf of the required size.
3759  */
3760 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3761 {
3762         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3763         struct nfs_getaclargs args = {
3764                 .fh = NFS_FH(inode),
3765                 .acl_pages = pages,
3766                 .acl_len = buflen,
3767         };
3768         struct nfs_getaclres res = {
3769                 .acl_len = buflen,
3770         };
3771         struct rpc_message msg = {
3772                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3773                 .rpc_argp = &args,
3774                 .rpc_resp = &res,
3775         };
3776         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3777         int ret = -ENOMEM, i;
3778
3779         /* As long as we're doing a round trip to the server anyway,
3780          * let's be prepared for a page of acl data. */
3781         if (npages == 0)
3782                 npages = 1;
3783         if (npages > ARRAY_SIZE(pages))
3784                 return -ERANGE;
3785
3786         for (i = 0; i < npages; i++) {
3787                 pages[i] = alloc_page(GFP_KERNEL);
3788                 if (!pages[i])
3789                         goto out_free;
3790         }
3791
3792         /* for decoding across pages */
3793         res.acl_scratch = alloc_page(GFP_KERNEL);
3794         if (!res.acl_scratch)
3795                 goto out_free;
3796
3797         args.acl_len = npages * PAGE_SIZE;
3798         args.acl_pgbase = 0;
3799
3800         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3801                 __func__, buf, buflen, npages, args.acl_len);
3802         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3803                              &msg, &args.seq_args, &res.seq_res, 0);
3804         if (ret)
3805                 goto out_free;
3806
3807         /* Handle the case where the passed-in buffer is too short */
3808         if (res.acl_flags & NFS4_ACL_TRUNC) {
3809                 /* Did the user only issue a request for the acl length? */
3810                 if (buf == NULL)
3811                         goto out_ok;
3812                 ret = -ERANGE;
3813                 goto out_free;
3814         }
3815         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3816         if (buf) {
3817                 if (res.acl_len > buflen) {
3818                         ret = -ERANGE;
3819                         goto out_free;
3820                 }
3821                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3822         }
3823 out_ok:
3824         ret = res.acl_len;
3825 out_free:
3826         for (i = 0; i < npages; i++)
3827                 if (pages[i])
3828                         __free_page(pages[i]);
3829         if (res.acl_scratch)
3830                 __free_page(res.acl_scratch);
3831         return ret;
3832 }
3833
3834 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3835 {
3836         struct nfs4_exception exception = { };
3837         ssize_t ret;
3838         do {
3839                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3840                 if (ret >= 0)
3841                         break;
3842                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3843         } while (exception.retry);
3844         return ret;
3845 }
3846
3847 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3848 {
3849         struct nfs_server *server = NFS_SERVER(inode);
3850         int ret;
3851
3852         if (!nfs4_server_supports_acls(server))
3853                 return -EOPNOTSUPP;
3854         ret = nfs_revalidate_inode(server, inode);
3855         if (ret < 0)
3856                 return ret;
3857         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3858                 nfs_zap_acl_cache(inode);
3859         ret = nfs4_read_cached_acl(inode, buf, buflen);
3860         if (ret != -ENOENT)
3861                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3862                  * but no cached acl data, just the acl length */
3863                 return ret;
3864         return nfs4_get_acl_uncached(inode, buf, buflen);
3865 }
3866
3867 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3868 {
3869         struct nfs_server *server = NFS_SERVER(inode);
3870         struct page *pages[NFS4ACL_MAXPAGES];
3871         struct nfs_setaclargs arg = {
3872                 .fh             = NFS_FH(inode),
3873                 .acl_pages      = pages,
3874                 .acl_len        = buflen,
3875         };
3876         struct nfs_setaclres res;
3877         struct rpc_message msg = {
3878                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3879                 .rpc_argp       = &arg,
3880                 .rpc_resp       = &res,
3881         };
3882         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3883         int ret, i;
3884
3885         if (!nfs4_server_supports_acls(server))
3886                 return -EOPNOTSUPP;
3887         if (npages > ARRAY_SIZE(pages))
3888                 return -ERANGE;
3889         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3890         if (i < 0)
3891                 return i;
3892         nfs4_inode_return_delegation(inode);
3893         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3894
3895         /*
3896          * Free each page after tx, so the only ref left is
3897          * held by the network stack
3898          */
3899         for (; i > 0; i--)
3900                 put_page(pages[i-1]);
3901
3902         /*
3903          * Acl update can result in inode attribute update.
3904          * so mark the attribute cache invalid.
3905          */
3906         spin_lock(&inode->i_lock);
3907         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3908         spin_unlock(&inode->i_lock);
3909         nfs_access_zap_cache(inode);
3910         nfs_zap_acl_cache(inode);
3911         return ret;
3912 }
3913
3914 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3915 {
3916         struct nfs4_exception exception = { };
3917         int err;
3918         do {
3919                 err = nfs4_handle_exception(NFS_SERVER(inode),
3920                                 __nfs4_proc_set_acl(inode, buf, buflen),
3921                                 &exception);
3922         } while (exception.retry);
3923         return err;
3924 }
3925
3926 static int
3927 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3928 {
3929         struct nfs_client *clp = server->nfs_client;
3930
3931         if (task->tk_status >= 0)
3932                 return 0;
3933         switch(task->tk_status) {
3934                 case -NFS4ERR_DELEG_REVOKED:
3935                 case -NFS4ERR_ADMIN_REVOKED:
3936                 case -NFS4ERR_BAD_STATEID:
3937                         if (state == NULL)
3938                                 break;
3939                         nfs_remove_bad_delegation(state->inode);
3940                 case -NFS4ERR_OPENMODE:
3941                         if (state == NULL)
3942                                 break;
3943                         nfs4_schedule_stateid_recovery(server, state);
3944                         goto wait_on_recovery;
3945                 case -NFS4ERR_EXPIRED:
3946                         if (state != NULL)
3947                                 nfs4_schedule_stateid_recovery(server, state);
3948                 case -NFS4ERR_STALE_STATEID:
3949                 case -NFS4ERR_STALE_CLIENTID:
3950                         nfs4_schedule_lease_recovery(clp);
3951                         goto wait_on_recovery;
3952 #if defined(CONFIG_NFS_V4_1)
3953                 case -NFS4ERR_BADSESSION:
3954                 case -NFS4ERR_BADSLOT:
3955                 case -NFS4ERR_BAD_HIGH_SLOT:
3956                 case -NFS4ERR_DEADSESSION:
3957                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3958                 case -NFS4ERR_SEQ_FALSE_RETRY:
3959                 case -NFS4ERR_SEQ_MISORDERED:
3960                         dprintk("%s ERROR %d, Reset session\n", __func__,
3961                                 task->tk_status);
3962                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3963                         task->tk_status = 0;
3964                         return -EAGAIN;
3965 #endif /* CONFIG_NFS_V4_1 */
3966                 case -NFS4ERR_DELAY:
3967                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3968                 case -NFS4ERR_GRACE:
3969                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3970                         task->tk_status = 0;
3971                         return -EAGAIN;
3972                 case -NFS4ERR_RETRY_UNCACHED_REP:
3973                 case -NFS4ERR_OLD_STATEID:
3974                         task->tk_status = 0;
3975                         return -EAGAIN;
3976         }
3977         task->tk_status = nfs4_map_errors(task->tk_status);
3978         return 0;
3979 wait_on_recovery:
3980         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3981         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3982                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3983         task->tk_status = 0;
3984         return -EAGAIN;
3985 }
3986
3987 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3988                                     nfs4_verifier *bootverf)
3989 {
3990         __be32 verf[2];
3991
3992         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3993                 /* An impossible timestamp guarantees this value
3994                  * will never match a generated boot time. */
3995                 verf[0] = 0;
3996                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3997         } else {
3998                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3999                 verf[0] = (__be32)nn->boot_time.tv_sec;
4000                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4001         }
4002         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4003 }
4004
4005 static unsigned int
4006 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4007                                    char *buf, size_t len)
4008 {
4009         unsigned int result;
4010
4011         rcu_read_lock();
4012         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4013                                 clp->cl_ipaddr,
4014                                 rpc_peeraddr2str(clp->cl_rpcclient,
4015                                                         RPC_DISPLAY_ADDR),
4016                                 rpc_peeraddr2str(clp->cl_rpcclient,
4017                                                         RPC_DISPLAY_PROTO));
4018         rcu_read_unlock();
4019         return result;
4020 }
4021
4022 static unsigned int
4023 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4024                                 char *buf, size_t len)
4025 {
4026         char *nodename = clp->cl_rpcclient->cl_nodename;
4027
4028         if (nfs4_client_id_uniquifier[0] != '\0')
4029                 nodename = nfs4_client_id_uniquifier;
4030         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4031                                 clp->rpc_ops->version, clp->cl_minorversion,
4032                                 nodename);
4033 }
4034
4035 /**
4036  * nfs4_proc_setclientid - Negotiate client ID
4037  * @clp: state data structure
4038  * @program: RPC program for NFSv4 callback service
4039  * @port: IP port number for NFS4 callback service
4040  * @cred: RPC credential to use for this call
4041  * @res: where to place the result
4042  *
4043  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4044  */
4045 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4046                 unsigned short port, struct rpc_cred *cred,
4047                 struct nfs4_setclientid_res *res)
4048 {
4049         nfs4_verifier sc_verifier;
4050         struct nfs4_setclientid setclientid = {
4051                 .sc_verifier = &sc_verifier,
4052                 .sc_prog = program,
4053                 .sc_cb_ident = clp->cl_cb_ident,
4054         };
4055         struct rpc_message msg = {
4056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4057                 .rpc_argp = &setclientid,
4058                 .rpc_resp = res,
4059                 .rpc_cred = cred,
4060         };
4061         int status;
4062
4063         /* nfs_client_id4 */
4064         nfs4_init_boot_verifier(clp, &sc_verifier);
4065         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4066                 setclientid.sc_name_len =
4067                                 nfs4_init_uniform_client_string(clp,
4068                                                 setclientid.sc_name,
4069                                                 sizeof(setclientid.sc_name));
4070         else
4071                 setclientid.sc_name_len =
4072                                 nfs4_init_nonuniform_client_string(clp,
4073                                                 setclientid.sc_name,
4074                                                 sizeof(setclientid.sc_name));
4075         /* cb_client4 */
4076         rcu_read_lock();
4077         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4078                                 sizeof(setclientid.sc_netid),
4079                                 rpc_peeraddr2str(clp->cl_rpcclient,
4080                                                         RPC_DISPLAY_NETID));
4081         rcu_read_unlock();
4082         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4083                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4084                                 clp->cl_ipaddr, port >> 8, port & 255);
4085
4086         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4087                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4088                 setclientid.sc_name_len, setclientid.sc_name);
4089         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4090         dprintk("NFS reply setclientid: %d\n", status);
4091         return status;
4092 }
4093
4094 /**
4095  * nfs4_proc_setclientid_confirm - Confirm client ID
4096  * @clp: state data structure
4097  * @res: result of a previous SETCLIENTID
4098  * @cred: RPC credential to use for this call
4099  *
4100  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4101  */
4102 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4103                 struct nfs4_setclientid_res *arg,
4104                 struct rpc_cred *cred)
4105 {
4106         struct nfs_fsinfo fsinfo;
4107         struct rpc_message msg = {
4108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4109                 .rpc_argp = arg,
4110                 .rpc_resp = &fsinfo,
4111                 .rpc_cred = cred,
4112         };
4113         unsigned long now;
4114         int status;
4115
4116         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4117                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4118                 clp->cl_clientid);
4119         now = jiffies;
4120         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4121         if (status == 0) {
4122                 spin_lock(&clp->cl_lock);
4123                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4124                 clp->cl_last_renewal = now;
4125                 spin_unlock(&clp->cl_lock);
4126         }
4127         dprintk("NFS reply setclientid_confirm: %d\n", status);
4128         return status;
4129 }
4130
4131 struct nfs4_delegreturndata {
4132         struct nfs4_delegreturnargs args;
4133         struct nfs4_delegreturnres res;
4134         struct nfs_fh fh;
4135         nfs4_stateid stateid;
4136         unsigned long timestamp;
4137         struct nfs_fattr fattr;
4138         int rpc_status;
4139 };
4140
4141 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4142 {
4143         struct nfs4_delegreturndata *data = calldata;
4144
4145         if (!nfs4_sequence_done(task, &data->res.seq_res))
4146                 return;
4147
4148         switch (task->tk_status) {
4149         case -NFS4ERR_STALE_STATEID:
4150         case -NFS4ERR_EXPIRED:
4151         case 0:
4152                 renew_lease(data->res.server, data->timestamp);
4153                 break;
4154         default:
4155                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4156                                 -EAGAIN) {
4157                         rpc_restart_call_prepare(task);
4158                         return;
4159                 }
4160         }
4161         data->rpc_status = task->tk_status;
4162 }
4163
4164 static void nfs4_delegreturn_release(void *calldata)
4165 {
4166         kfree(calldata);
4167 }
4168
4169 #if defined(CONFIG_NFS_V4_1)
4170 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4171 {
4172         struct nfs4_delegreturndata *d_data;
4173
4174         d_data = (struct nfs4_delegreturndata *)data;
4175
4176         nfs4_setup_sequence(d_data->res.server,
4177                         &d_data->args.seq_args,
4178                         &d_data->res.seq_res,
4179                         task);
4180 }
4181 #endif /* CONFIG_NFS_V4_1 */
4182
4183 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4184 #if defined(CONFIG_NFS_V4_1)
4185         .rpc_call_prepare = nfs4_delegreturn_prepare,
4186 #endif /* CONFIG_NFS_V4_1 */
4187         .rpc_call_done = nfs4_delegreturn_done,
4188         .rpc_release = nfs4_delegreturn_release,
4189 };
4190
4191 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4192 {
4193         struct nfs4_delegreturndata *data;
4194         struct nfs_server *server = NFS_SERVER(inode);
4195         struct rpc_task *task;
4196         struct rpc_message msg = {
4197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4198                 .rpc_cred = cred,
4199         };
4200         struct rpc_task_setup task_setup_data = {
4201                 .rpc_client = server->client,
4202                 .rpc_message = &msg,
4203                 .callback_ops = &nfs4_delegreturn_ops,
4204                 .flags = RPC_TASK_ASYNC,
4205         };
4206         int status = 0;
4207
4208         data = kzalloc(sizeof(*data), GFP_NOFS);
4209         if (data == NULL)
4210                 return -ENOMEM;
4211         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4212         data->args.fhandle = &data->fh;
4213         data->args.stateid = &data->stateid;
4214         data->args.bitmask = server->cache_consistency_bitmask;
4215         nfs_copy_fh(&data->fh, NFS_FH(inode));
4216         nfs4_stateid_copy(&data->stateid, stateid);
4217         data->res.fattr = &data->fattr;
4218         data->res.server = server;
4219         nfs_fattr_init(data->res.fattr);
4220         data->timestamp = jiffies;
4221         data->rpc_status = 0;
4222
4223         task_setup_data.callback_data = data;
4224         msg.rpc_argp = &data->args;
4225         msg.rpc_resp = &data->res;
4226         task = rpc_run_task(&task_setup_data);
4227         if (IS_ERR(task))
4228                 return PTR_ERR(task);
4229         if (!issync)
4230                 goto out;
4231         status = nfs4_wait_for_completion_rpc_task(task);
4232         if (status != 0)
4233                 goto out;
4234         status = data->rpc_status;
4235         if (status == 0)
4236                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4237         else
4238                 nfs_refresh_inode(inode, &data->fattr);
4239 out:
4240         rpc_put_task(task);
4241         return status;
4242 }
4243
4244 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4245 {
4246         struct nfs_server *server = NFS_SERVER(inode);
4247         struct nfs4_exception exception = { };
4248         int err;
4249         do {
4250                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4251                 switch (err) {
4252                         case -NFS4ERR_STALE_STATEID:
4253                         case -NFS4ERR_EXPIRED:
4254                         case 0:
4255                                 return 0;
4256                 }
4257                 err = nfs4_handle_exception(server, err, &exception);
4258         } while (exception.retry);
4259         return err;
4260 }
4261
4262 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4263 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4264
4265 /*
4266  * sleep, with exponential backoff, and retry the LOCK operation.
4267  */
4268 static unsigned long
4269 nfs4_set_lock_task_retry(unsigned long timeout)
4270 {
4271         freezable_schedule_timeout_killable(timeout);
4272         timeout <<= 1;
4273         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4274                 return NFS4_LOCK_MAXTIMEOUT;
4275         return timeout;
4276 }
4277
4278 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4279 {
4280         struct inode *inode = state->inode;
4281         struct nfs_server *server = NFS_SERVER(inode);
4282         struct nfs_client *clp = server->nfs_client;
4283         struct nfs_lockt_args arg = {
4284                 .fh = NFS_FH(inode),
4285                 .fl = request,
4286         };
4287         struct nfs_lockt_res res = {
4288                 .denied = request,
4289         };
4290         struct rpc_message msg = {
4291                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4292                 .rpc_argp       = &arg,
4293                 .rpc_resp       = &res,
4294                 .rpc_cred       = state->owner->so_cred,
4295         };
4296         struct nfs4_lock_state *lsp;
4297         int status;
4298
4299         arg.lock_owner.clientid = clp->cl_clientid;
4300         status = nfs4_set_lock_state(state, request);
4301         if (status != 0)
4302                 goto out;
4303         lsp = request->fl_u.nfs4_fl.owner;
4304         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4305         arg.lock_owner.s_dev = server->s_dev;
4306         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4307         switch (status) {
4308                 case 0:
4309                         request->fl_type = F_UNLCK;
4310                         break;
4311                 case -NFS4ERR_DENIED:
4312                         status = 0;
4313         }
4314         request->fl_ops->fl_release_private(request);
4315 out:
4316         return status;
4317 }
4318
4319 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4320 {
4321         struct nfs4_exception exception = { };
4322         int err;
4323
4324         do {
4325                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4326                                 _nfs4_proc_getlk(state, cmd, request),
4327                                 &exception);
4328         } while (exception.retry);
4329         return err;
4330 }
4331
4332 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4333 {
4334         int res = 0;
4335         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4336                 case FL_POSIX:
4337                         res = posix_lock_file_wait(file, fl);
4338                         break;
4339                 case FL_FLOCK:
4340                         res = flock_lock_file_wait(file, fl);
4341                         break;
4342                 default:
4343                         BUG();
4344         }
4345         return res;
4346 }
4347
4348 struct nfs4_unlockdata {
4349         struct nfs_locku_args arg;
4350         struct nfs_locku_res res;
4351         struct nfs4_lock_state *lsp;
4352         struct nfs_open_context *ctx;
4353         struct file_lock fl;
4354         const struct nfs_server *server;
4355         unsigned long timestamp;
4356 };
4357
4358 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4359                 struct nfs_open_context *ctx,
4360                 struct nfs4_lock_state *lsp,
4361                 struct nfs_seqid *seqid)
4362 {
4363         struct nfs4_unlockdata *p;
4364         struct inode *inode = lsp->ls_state->inode;
4365
4366         p = kzalloc(sizeof(*p), GFP_NOFS);
4367         if (p == NULL)
4368                 return NULL;
4369         p->arg.fh = NFS_FH(inode);
4370         p->arg.fl = &p->fl;
4371         p->arg.seqid = seqid;
4372         p->res.seqid = seqid;
4373         p->arg.stateid = &lsp->ls_stateid;
4374         p->lsp = lsp;
4375         atomic_inc(&lsp->ls_count);
4376         /* Ensure we don't close file until we're done freeing locks! */
4377         p->ctx = get_nfs_open_context(ctx);
4378         memcpy(&p->fl, fl, sizeof(p->fl));
4379         p->server = NFS_SERVER(inode);
4380         return p;
4381 }
4382
4383 static void nfs4_locku_release_calldata(void *data)
4384 {
4385         struct nfs4_unlockdata *calldata = data;
4386         nfs_free_seqid(calldata->arg.seqid);
4387         nfs4_put_lock_state(calldata->lsp);
4388         put_nfs_open_context(calldata->ctx);
4389         kfree(calldata);
4390 }
4391
4392 static void nfs4_locku_done(struct rpc_task *task, void *data)
4393 {
4394         struct nfs4_unlockdata *calldata = data;
4395
4396         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4397                 return;
4398         switch (task->tk_status) {
4399                 case 0:
4400                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4401                                         &calldata->res.stateid);
4402                         renew_lease(calldata->server, calldata->timestamp);
4403                         break;
4404                 case -NFS4ERR_BAD_STATEID:
4405                 case -NFS4ERR_OLD_STATEID:
4406                 case -NFS4ERR_STALE_STATEID:
4407                 case -NFS4ERR_EXPIRED:
4408                         break;
4409                 default:
4410                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4411                                 rpc_restart_call_prepare(task);
4412         }
4413         nfs_release_seqid(calldata->arg.seqid);
4414 }
4415
4416 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4417 {
4418         struct nfs4_unlockdata *calldata = data;
4419
4420         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4421                 return;
4422         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4423                 /* Note: exit _without_ running nfs4_locku_done */
4424                 task->tk_action = NULL;
4425                 nfs4_sequence_done(task, &calldata->res.seq_res);
4426                 return;
4427         }
4428         calldata->timestamp = jiffies;
4429         if (nfs4_setup_sequence(calldata->server,
4430                                 &calldata->arg.seq_args,
4431                                 &calldata->res.seq_res,
4432                                 task) != 0)
4433                 nfs_release_seqid(calldata->arg.seqid);
4434 }
4435
4436 static const struct rpc_call_ops nfs4_locku_ops = {
4437         .rpc_call_prepare = nfs4_locku_prepare,
4438         .rpc_call_done = nfs4_locku_done,
4439         .rpc_release = nfs4_locku_release_calldata,
4440 };
4441
4442 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4443                 struct nfs_open_context *ctx,
4444                 struct nfs4_lock_state *lsp,
4445                 struct nfs_seqid *seqid)
4446 {
4447         struct nfs4_unlockdata *data;
4448         struct rpc_message msg = {
4449                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4450                 .rpc_cred = ctx->cred,
4451         };
4452         struct rpc_task_setup task_setup_data = {
4453                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4454                 .rpc_message = &msg,
4455                 .callback_ops = &nfs4_locku_ops,
4456                 .workqueue = nfsiod_workqueue,
4457                 .flags = RPC_TASK_ASYNC,
4458         };
4459
4460         /* Ensure this is an unlock - when canceling a lock, the
4461          * canceled lock is passed in, and it won't be an unlock.
4462          */
4463         fl->fl_type = F_UNLCK;
4464
4465         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4466         if (data == NULL) {
4467                 nfs_free_seqid(seqid);
4468                 return ERR_PTR(-ENOMEM);
4469         }
4470
4471         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4472         msg.rpc_argp = &data->arg;
4473         msg.rpc_resp = &data->res;
4474         task_setup_data.callback_data = data;
4475         return rpc_run_task(&task_setup_data);
4476 }
4477
4478 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4479 {
4480         struct nfs_inode *nfsi = NFS_I(state->inode);
4481         struct nfs_seqid *seqid;
4482         struct nfs4_lock_state *lsp;
4483         struct rpc_task *task;
4484         int status = 0;
4485         unsigned char fl_flags = request->fl_flags;
4486
4487         status = nfs4_set_lock_state(state, request);
4488         /* Unlock _before_ we do the RPC call */
4489         request->fl_flags |= FL_EXISTS;
4490         down_read(&nfsi->rwsem);
4491         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4492                 up_read(&nfsi->rwsem);
4493                 goto out;
4494         }
4495         up_read(&nfsi->rwsem);
4496         if (status != 0)
4497                 goto out;
4498         /* Is this a delegated lock? */
4499         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4500                 goto out;
4501         lsp = request->fl_u.nfs4_fl.owner;
4502         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4503         status = -ENOMEM;
4504         if (seqid == NULL)
4505                 goto out;
4506         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4507         status = PTR_ERR(task);
4508         if (IS_ERR(task))
4509                 goto out;
4510         status = nfs4_wait_for_completion_rpc_task(task);
4511         rpc_put_task(task);
4512 out:
4513         request->fl_flags = fl_flags;
4514         return status;
4515 }
4516
4517 struct nfs4_lockdata {
4518         struct nfs_lock_args arg;
4519         struct nfs_lock_res res;
4520         struct nfs4_lock_state *lsp;
4521         struct nfs_open_context *ctx;
4522         struct file_lock fl;
4523         unsigned long timestamp;
4524         int rpc_status;
4525         int cancelled;
4526         struct nfs_server *server;
4527 };
4528
4529 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4530                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4531                 gfp_t gfp_mask)
4532 {
4533         struct nfs4_lockdata *p;
4534         struct inode *inode = lsp->ls_state->inode;
4535         struct nfs_server *server = NFS_SERVER(inode);
4536
4537         p = kzalloc(sizeof(*p), gfp_mask);
4538         if (p == NULL)
4539                 return NULL;
4540
4541         p->arg.fh = NFS_FH(inode);
4542         p->arg.fl = &p->fl;
4543         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4544         if (p->arg.open_seqid == NULL)
4545                 goto out_free;
4546         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4547         if (p->arg.lock_seqid == NULL)
4548                 goto out_free_seqid;
4549         p->arg.lock_stateid = &lsp->ls_stateid;
4550         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4551         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4552         p->arg.lock_owner.s_dev = server->s_dev;
4553         p->res.lock_seqid = p->arg.lock_seqid;
4554         p->lsp = lsp;
4555         p->server = server;
4556         atomic_inc(&lsp->ls_count);
4557         p->ctx = get_nfs_open_context(ctx);
4558         memcpy(&p->fl, fl, sizeof(p->fl));
4559         return p;
4560 out_free_seqid:
4561         nfs_free_seqid(p->arg.open_seqid);
4562 out_free:
4563         kfree(p);
4564         return NULL;
4565 }
4566
4567 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4568 {
4569         struct nfs4_lockdata *data = calldata;
4570         struct nfs4_state *state = data->lsp->ls_state;
4571
4572         dprintk("%s: begin!\n", __func__);
4573         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4574                 return;
4575         /* Do we need to do an open_to_lock_owner? */
4576         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4577                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4578                         goto out_release_lock_seqid;
4579                 }
4580                 data->arg.open_stateid = &state->stateid;
4581                 data->arg.new_lock_owner = 1;
4582                 data->res.open_seqid = data->arg.open_seqid;
4583         } else
4584                 data->arg.new_lock_owner = 0;
4585         data->timestamp = jiffies;
4586         if (nfs4_setup_sequence(data->server,
4587                                 &data->arg.seq_args,
4588                                 &data->res.seq_res,
4589                                 task) == 0)
4590                 return;
4591         nfs_release_seqid(data->arg.open_seqid);
4592 out_release_lock_seqid:
4593         nfs_release_seqid(data->arg.lock_seqid);
4594         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4595 }
4596
4597 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4598 {
4599         struct nfs4_lockdata *data = calldata;
4600
4601         dprintk("%s: begin!\n", __func__);
4602
4603         if (!nfs4_sequence_done(task, &data->res.seq_res))
4604                 return;
4605
4606         data->rpc_status = task->tk_status;
4607         if (data->arg.new_lock_owner != 0) {
4608                 if (data->rpc_status == 0)
4609                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4610                 else
4611                         goto out;
4612         }
4613         if (data->rpc_status == 0) {
4614                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4615                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4616                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4617         }
4618 out:
4619         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4620 }
4621
4622 static void nfs4_lock_release(void *calldata)
4623 {
4624         struct nfs4_lockdata *data = calldata;
4625
4626         dprintk("%s: begin!\n", __func__);
4627         nfs_free_seqid(data->arg.open_seqid);
4628         if (data->cancelled != 0) {
4629                 struct rpc_task *task;
4630                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4631                                 data->arg.lock_seqid);
4632                 if (!IS_ERR(task))
4633                         rpc_put_task_async(task);
4634                 dprintk("%s: cancelling lock!\n", __func__);
4635         } else
4636                 nfs_free_seqid(data->arg.lock_seqid);
4637         nfs4_put_lock_state(data->lsp);
4638         put_nfs_open_context(data->ctx);
4639         kfree(data);
4640         dprintk("%s: done!\n", __func__);
4641 }
4642
4643 static const struct rpc_call_ops nfs4_lock_ops = {
4644         .rpc_call_prepare = nfs4_lock_prepare,
4645         .rpc_call_done = nfs4_lock_done,
4646         .rpc_release = nfs4_lock_release,
4647 };
4648
4649 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4650 {
4651         switch (error) {
4652         case -NFS4ERR_ADMIN_REVOKED:
4653         case -NFS4ERR_BAD_STATEID:
4654                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4655                 if (new_lock_owner != 0 ||
4656                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4657                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4658                 break;
4659         case -NFS4ERR_STALE_STATEID:
4660                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4661         case -NFS4ERR_EXPIRED:
4662                 nfs4_schedule_lease_recovery(server->nfs_client);
4663         };
4664 }
4665
4666 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4667 {
4668         struct nfs4_lockdata *data;
4669         struct rpc_task *task;
4670         struct rpc_message msg = {
4671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4672                 .rpc_cred = state->owner->so_cred,
4673         };
4674         struct rpc_task_setup task_setup_data = {
4675                 .rpc_client = NFS_CLIENT(state->inode),
4676                 .rpc_message = &msg,
4677                 .callback_ops = &nfs4_lock_ops,
4678                 .workqueue = nfsiod_workqueue,
4679                 .flags = RPC_TASK_ASYNC,
4680         };
4681         int ret;
4682
4683         dprintk("%s: begin!\n", __func__);
4684         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4685                         fl->fl_u.nfs4_fl.owner,
4686                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4687         if (data == NULL)
4688                 return -ENOMEM;
4689         if (IS_SETLKW(cmd))
4690                 data->arg.block = 1;
4691         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4692         msg.rpc_argp = &data->arg;
4693         msg.rpc_resp = &data->res;
4694         task_setup_data.callback_data = data;
4695         if (recovery_type > NFS_LOCK_NEW) {
4696                 if (recovery_type == NFS_LOCK_RECLAIM)
4697                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4698                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4699         }
4700         task = rpc_run_task(&task_setup_data);
4701         if (IS_ERR(task))
4702                 return PTR_ERR(task);
4703         ret = nfs4_wait_for_completion_rpc_task(task);
4704         if (ret == 0) {
4705                 ret = data->rpc_status;
4706                 if (ret)
4707                         nfs4_handle_setlk_error(data->server, data->lsp,
4708                                         data->arg.new_lock_owner, ret);
4709         } else
4710                 data->cancelled = 1;
4711         rpc_put_task(task);
4712         dprintk("%s: done, ret = %d!\n", __func__, ret);
4713         return ret;
4714 }
4715
4716 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4717 {
4718         struct nfs_server *server = NFS_SERVER(state->inode);
4719         struct nfs4_exception exception = {
4720                 .inode = state->inode,
4721         };
4722         int err;
4723
4724         do {
4725                 /* Cache the lock if possible... */
4726                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4727                         return 0;
4728                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4729                 if (err != -NFS4ERR_DELAY)
4730                         break;
4731                 nfs4_handle_exception(server, err, &exception);
4732         } while (exception.retry);
4733         return err;
4734 }
4735
4736 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4737 {
4738         struct nfs_server *server = NFS_SERVER(state->inode);
4739         struct nfs4_exception exception = {
4740                 .inode = state->inode,
4741         };
4742         int err;
4743
4744         err = nfs4_set_lock_state(state, request);
4745         if (err != 0)
4746                 return err;
4747         do {
4748                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4749                         return 0;
4750                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4751                 switch (err) {
4752                 default:
4753                         goto out;
4754                 case -NFS4ERR_GRACE:
4755                 case -NFS4ERR_DELAY:
4756                         nfs4_handle_exception(server, err, &exception);
4757                         err = 0;
4758                 }
4759         } while (exception.retry);
4760 out:
4761         return err;
4762 }
4763
4764 #if defined(CONFIG_NFS_V4_1)
4765 /**
4766  * nfs41_check_expired_locks - possibly free a lock stateid
4767  *
4768  * @state: NFSv4 state for an inode
4769  *
4770  * Returns NFS_OK if recovery for this stateid is now finished.
4771  * Otherwise a negative NFS4ERR value is returned.
4772  */
4773 static int nfs41_check_expired_locks(struct nfs4_state *state)
4774 {
4775         int status, ret = -NFS4ERR_BAD_STATEID;
4776         struct nfs4_lock_state *lsp;
4777         struct nfs_server *server = NFS_SERVER(state->inode);
4778
4779         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4780                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4781                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4782                         if (status != NFS_OK) {
4783                                 /* Free the stateid unless the server
4784                                  * informs us the stateid is unrecognized. */
4785                                 if (status != -NFS4ERR_BAD_STATEID)
4786                                         nfs41_free_stateid(server,
4787                                                         &lsp->ls_stateid);
4788                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4789                                 ret = status;
4790                         }
4791                 }
4792         };
4793
4794         return ret;
4795 }
4796
4797 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4798 {
4799         int status = NFS_OK;
4800
4801         if (test_bit(LK_STATE_IN_USE, &state->flags))
4802                 status = nfs41_check_expired_locks(state);
4803         if (status != NFS_OK)
4804                 status = nfs4_lock_expired(state, request);
4805         return status;
4806 }
4807 #endif
4808
4809 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4810 {
4811         struct nfs_inode *nfsi = NFS_I(state->inode);
4812         unsigned char fl_flags = request->fl_flags;
4813         int status = -ENOLCK;
4814
4815         if ((fl_flags & FL_POSIX) &&
4816                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4817                 goto out;
4818         /* Is this a delegated open? */
4819         status = nfs4_set_lock_state(state, request);
4820         if (status != 0)
4821                 goto out;
4822         request->fl_flags |= FL_ACCESS;
4823         status = do_vfs_lock(request->fl_file, request);
4824         if (status < 0)
4825                 goto out;
4826         down_read(&nfsi->rwsem);
4827         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4828                 /* Yes: cache locks! */
4829                 /* ...but avoid races with delegation recall... */
4830                 request->fl_flags = fl_flags & ~FL_SLEEP;
4831                 status = do_vfs_lock(request->fl_file, request);
4832                 goto out_unlock;
4833         }
4834         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4835         if (status != 0)
4836                 goto out_unlock;
4837         /* Note: we always want to sleep here! */
4838         request->fl_flags = fl_flags | FL_SLEEP;
4839         if (do_vfs_lock(request->fl_file, request) < 0)
4840                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4841                         "manager!\n", __func__);
4842 out_unlock:
4843         up_read(&nfsi->rwsem);
4844 out:
4845         request->fl_flags = fl_flags;
4846         return status;
4847 }
4848
4849 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4850 {
4851         struct nfs4_exception exception = {
4852                 .state = state,
4853                 .inode = state->inode,
4854         };
4855         int err;
4856
4857         do {
4858                 err = _nfs4_proc_setlk(state, cmd, request);
4859                 if (err == -NFS4ERR_DENIED)
4860                         err = -EAGAIN;
4861                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4862                                 err, &exception);
4863         } while (exception.retry);
4864         return err;
4865 }
4866
4867 static int
4868 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4869 {
4870         struct nfs_open_context *ctx;
4871         struct nfs4_state *state;
4872         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4873         int status;
4874
4875         /* verify open state */
4876         ctx = nfs_file_open_context(filp);
4877         state = ctx->state;
4878
4879         if (request->fl_start < 0 || request->fl_end < 0)
4880                 return -EINVAL;
4881
4882         if (IS_GETLK(cmd)) {
4883                 if (state != NULL)
4884                         return nfs4_proc_getlk(state, F_GETLK, request);
4885                 return 0;
4886         }
4887
4888         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4889                 return -EINVAL;
4890
4891         if (request->fl_type == F_UNLCK) {
4892                 if (state != NULL)
4893                         return nfs4_proc_unlck(state, cmd, request);
4894                 return 0;
4895         }
4896
4897         if (state == NULL)
4898                 return -ENOLCK;
4899         /*
4900          * Don't rely on the VFS having checked the file open mode,
4901          * since it won't do this for flock() locks.
4902          */
4903         switch (request->fl_type) {
4904         case F_RDLCK:
4905                 if (!(filp->f_mode & FMODE_READ))
4906                         return -EBADF;
4907                 break;
4908         case F_WRLCK:
4909                 if (!(filp->f_mode & FMODE_WRITE))
4910                         return -EBADF;
4911         }
4912
4913         do {
4914                 status = nfs4_proc_setlk(state, cmd, request);
4915                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4916                         break;
4917                 timeout = nfs4_set_lock_task_retry(timeout);
4918                 status = -ERESTARTSYS;
4919                 if (signalled())
4920                         break;
4921         } while(status < 0);
4922         return status;
4923 }
4924
4925 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4926 {
4927         struct nfs_server *server = NFS_SERVER(state->inode);
4928         struct nfs4_exception exception = { };
4929         int err;
4930
4931         err = nfs4_set_lock_state(state, fl);
4932         if (err != 0)
4933                 goto out;
4934         do {
4935                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4936                 switch (err) {
4937                         default:
4938                                 printk(KERN_ERR "NFS: %s: unhandled error "
4939                                         "%d.\n", __func__, err);
4940                         case 0:
4941                         case -ESTALE:
4942                                 goto out;
4943                         case -NFS4ERR_EXPIRED:
4944                                 nfs4_schedule_stateid_recovery(server, state);
4945                         case -NFS4ERR_STALE_CLIENTID:
4946                         case -NFS4ERR_STALE_STATEID:
4947                                 nfs4_schedule_lease_recovery(server->nfs_client);
4948                                 goto out;
4949                         case -NFS4ERR_BADSESSION:
4950                         case -NFS4ERR_BADSLOT:
4951                         case -NFS4ERR_BAD_HIGH_SLOT:
4952                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4953                         case -NFS4ERR_DEADSESSION:
4954                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4955                                 goto out;
4956                         case -ERESTARTSYS:
4957                                 /*
4958                                  * The show must go on: exit, but mark the
4959                                  * stateid as needing recovery.
4960                                  */
4961                         case -NFS4ERR_DELEG_REVOKED:
4962                         case -NFS4ERR_ADMIN_REVOKED:
4963                         case -NFS4ERR_BAD_STATEID:
4964                         case -NFS4ERR_OPENMODE:
4965                                 nfs4_schedule_stateid_recovery(server, state);
4966                                 err = 0;
4967                                 goto out;
4968                         case -ENOMEM:
4969                         case -NFS4ERR_DENIED:
4970                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4971                                 err = 0;
4972                                 goto out;
4973                         case -NFS4ERR_DELAY:
4974                                 break;
4975                 }
4976                 err = nfs4_handle_exception(server, err, &exception);
4977         } while (exception.retry);
4978 out:
4979         return err;
4980 }
4981
4982 struct nfs_release_lockowner_data {
4983         struct nfs4_lock_state *lsp;
4984         struct nfs_server *server;
4985         struct nfs_release_lockowner_args args;
4986 };
4987
4988 static void nfs4_release_lockowner_release(void *calldata)
4989 {
4990         struct nfs_release_lockowner_data *data = calldata;
4991         nfs4_free_lock_state(data->server, data->lsp);
4992         kfree(calldata);
4993 }
4994
4995 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4996         .rpc_release = nfs4_release_lockowner_release,
4997 };
4998
4999 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5000 {
5001         struct nfs_server *server = lsp->ls_state->owner->so_server;
5002         struct nfs_release_lockowner_data *data;
5003         struct rpc_message msg = {
5004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5005         };
5006
5007         if (server->nfs_client->cl_mvops->minor_version != 0)
5008                 return -EINVAL;
5009         data = kmalloc(sizeof(*data), GFP_NOFS);
5010         if (!data)
5011                 return -ENOMEM;
5012         data->lsp = lsp;
5013         data->server = server;
5014         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5015         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5016         data->args.lock_owner.s_dev = server->s_dev;
5017         msg.rpc_argp = &data->args;
5018         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5019         return 0;
5020 }
5021
5022 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5023
5024 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5025                                    const void *buf, size_t buflen,
5026                                    int flags, int type)
5027 {
5028         if (strcmp(key, "") != 0)
5029                 return -EINVAL;
5030
5031         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5032 }
5033
5034 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5035                                    void *buf, size_t buflen, int type)
5036 {
5037         if (strcmp(key, "") != 0)
5038                 return -EINVAL;
5039
5040         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5041 }
5042
5043 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5044                                        size_t list_len, const char *name,
5045                                        size_t name_len, int type)
5046 {
5047         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5048
5049         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5050                 return 0;
5051
5052         if (list && len <= list_len)
5053                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5054         return len;
5055 }
5056
5057 /*
5058  * nfs_fhget will use either the mounted_on_fileid or the fileid
5059  */
5060 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5061 {
5062         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5063                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5064               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5065               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5066                 return;
5067
5068         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5069                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5070         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5071         fattr->nlink = 2;
5072 }
5073
5074 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5075                                    const struct qstr *name,
5076                                    struct nfs4_fs_locations *fs_locations,
5077                                    struct page *page)
5078 {
5079         struct nfs_server *server = NFS_SERVER(dir);
5080         u32 bitmask[2] = {
5081                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5082         };
5083         struct nfs4_fs_locations_arg args = {
5084                 .dir_fh = NFS_FH(dir),
5085                 .name = name,
5086                 .page = page,
5087                 .bitmask = bitmask,
5088         };
5089         struct nfs4_fs_locations_res res = {
5090                 .fs_locations = fs_locations,
5091         };
5092         struct rpc_message msg = {
5093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5094                 .rpc_argp = &args,
5095                 .rpc_resp = &res,
5096         };
5097         int status;
5098
5099         dprintk("%s: start\n", __func__);
5100
5101         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5102          * is not supported */
5103         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5104                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5105         else
5106                 bitmask[0] |= FATTR4_WORD0_FILEID;
5107
5108         nfs_fattr_init(&fs_locations->fattr);
5109         fs_locations->server = server;
5110         fs_locations->nlocations = 0;
5111         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5112         dprintk("%s: returned status = %d\n", __func__, status);
5113         return status;
5114 }
5115
5116 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5117                            const struct qstr *name,
5118                            struct nfs4_fs_locations *fs_locations,
5119                            struct page *page)
5120 {
5121         struct nfs4_exception exception = { };
5122         int err;
5123         do {
5124                 err = nfs4_handle_exception(NFS_SERVER(dir),
5125                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5126                                 &exception);
5127         } while (exception.retry);
5128         return err;
5129 }
5130
5131 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5132 {
5133         int status;
5134         struct nfs4_secinfo_arg args = {
5135                 .dir_fh = NFS_FH(dir),
5136                 .name   = name,
5137         };
5138         struct nfs4_secinfo_res res = {
5139                 .flavors     = flavors,
5140         };
5141         struct rpc_message msg = {
5142                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5143                 .rpc_argp = &args,
5144                 .rpc_resp = &res,
5145         };
5146
5147         dprintk("NFS call  secinfo %s\n", name->name);
5148         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5149         dprintk("NFS reply  secinfo: %d\n", status);
5150         return status;
5151 }
5152
5153 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5154                       struct nfs4_secinfo_flavors *flavors)
5155 {
5156         struct nfs4_exception exception = { };
5157         int err;
5158         do {
5159                 err = nfs4_handle_exception(NFS_SERVER(dir),
5160                                 _nfs4_proc_secinfo(dir, name, flavors),
5161                                 &exception);
5162         } while (exception.retry);
5163         return err;
5164 }
5165
5166 #ifdef CONFIG_NFS_V4_1
5167 /*
5168  * Check the exchange flags returned by the server for invalid flags, having
5169  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5170  * DS flags set.
5171  */
5172 static int nfs4_check_cl_exchange_flags(u32 flags)
5173 {
5174         if (flags & ~EXCHGID4_FLAG_MASK_R)
5175                 goto out_inval;
5176         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5177             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5178                 goto out_inval;
5179         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5180                 goto out_inval;
5181         return NFS_OK;
5182 out_inval:
5183         return -NFS4ERR_INVAL;
5184 }
5185
5186 static bool
5187 nfs41_same_server_scope(struct nfs41_server_scope *a,
5188                         struct nfs41_server_scope *b)
5189 {
5190         if (a->server_scope_sz == b->server_scope_sz &&
5191             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5192                 return true;
5193
5194         return false;
5195 }
5196
5197 /*
5198  * nfs4_proc_bind_conn_to_session()
5199  *
5200  * The 4.1 client currently uses the same TCP connection for the
5201  * fore and backchannel.
5202  */
5203 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5204 {
5205         int status;
5206         struct nfs41_bind_conn_to_session_res res;
5207         struct rpc_message msg = {
5208                 .rpc_proc =
5209                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5210                 .rpc_argp = clp,
5211                 .rpc_resp = &res,
5212                 .rpc_cred = cred,
5213         };
5214
5215         dprintk("--> %s\n", __func__);
5216
5217         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5218         if (unlikely(res.session == NULL)) {
5219                 status = -ENOMEM;
5220                 goto out;
5221         }
5222
5223         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5224         if (status == 0) {
5225                 if (memcmp(res.session->sess_id.data,
5226                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5227                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5228                         status = -EIO;
5229                         goto out_session;
5230                 }
5231                 if (res.dir != NFS4_CDFS4_BOTH) {
5232                         dprintk("NFS: %s: Unexpected direction from server\n",
5233                                 __func__);
5234                         status = -EIO;
5235                         goto out_session;
5236                 }
5237                 if (res.use_conn_in_rdma_mode) {
5238                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5239                                 __func__);
5240                         status = -EIO;
5241                         goto out_session;
5242                 }
5243         }
5244 out_session:
5245         kfree(res.session);
5246 out:
5247         dprintk("<-- %s status= %d\n", __func__, status);
5248         return status;
5249 }
5250
5251 /*
5252  * nfs4_proc_exchange_id()
5253  *
5254  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5255  *
5256  * Since the clientid has expired, all compounds using sessions
5257  * associated with the stale clientid will be returning
5258  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5259  * be in some phase of session reset.
5260  */
5261 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5262 {
5263         nfs4_verifier verifier;
5264         struct nfs41_exchange_id_args args = {
5265                 .verifier = &verifier,
5266                 .client = clp,
5267                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5268         };
5269         struct nfs41_exchange_id_res res = {
5270                 0
5271         };
5272         int status;
5273         struct rpc_message msg = {
5274                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5275                 .rpc_argp = &args,
5276                 .rpc_resp = &res,
5277                 .rpc_cred = cred,
5278         };
5279
5280         nfs4_init_boot_verifier(clp, &verifier);
5281         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5282                                                         sizeof(args.id));
5283         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5284                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5285                 args.id_len, args.id);
5286
5287         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5288                                         GFP_NOFS);
5289         if (unlikely(res.server_owner == NULL)) {
5290                 status = -ENOMEM;
5291                 goto out;
5292         }
5293
5294         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5295                                         GFP_NOFS);
5296         if (unlikely(res.server_scope == NULL)) {
5297                 status = -ENOMEM;
5298                 goto out_server_owner;
5299         }
5300
5301         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5302         if (unlikely(res.impl_id == NULL)) {
5303                 status = -ENOMEM;
5304                 goto out_server_scope;
5305         }
5306
5307         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5308         if (status == 0)
5309                 status = nfs4_check_cl_exchange_flags(res.flags);
5310
5311         if (status == 0) {
5312                 clp->cl_clientid = res.clientid;
5313                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5314                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5315                         clp->cl_seqid = res.seqid;
5316
5317                 kfree(clp->cl_serverowner);
5318                 clp->cl_serverowner = res.server_owner;
5319                 res.server_owner = NULL;
5320
5321                 /* use the most recent implementation id */
5322                 kfree(clp->cl_implid);
5323                 clp->cl_implid = res.impl_id;
5324
5325                 if (clp->cl_serverscope != NULL &&
5326                     !nfs41_same_server_scope(clp->cl_serverscope,
5327                                              res.server_scope)) {
5328                         dprintk("%s: server_scope mismatch detected\n",
5329                                 __func__);
5330                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5331                         kfree(clp->cl_serverscope);
5332                         clp->cl_serverscope = NULL;
5333                 }
5334
5335                 if (clp->cl_serverscope == NULL) {
5336                         clp->cl_serverscope = res.server_scope;
5337                         goto out;
5338                 }
5339         } else
5340                 kfree(res.impl_id);
5341
5342 out_server_owner:
5343         kfree(res.server_owner);
5344 out_server_scope:
5345         kfree(res.server_scope);
5346 out:
5347         if (clp->cl_implid != NULL)
5348                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5349                         "domain: %s, name: %s, date: %llu,%u\n",
5350                         clp->cl_implid->domain, clp->cl_implid->name,
5351                         clp->cl_implid->date.seconds,
5352                         clp->cl_implid->date.nseconds);
5353         dprintk("NFS reply exchange_id: %d\n", status);
5354         return status;
5355 }
5356
5357 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5358                 struct rpc_cred *cred)
5359 {
5360         struct rpc_message msg = {
5361                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5362                 .rpc_argp = clp,
5363                 .rpc_cred = cred,
5364         };
5365         int status;
5366
5367         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5368         if (status)
5369                 dprintk("NFS: Got error %d from the server %s on "
5370                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5371         return status;
5372 }
5373
5374 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5375                 struct rpc_cred *cred)
5376 {
5377         unsigned int loop;
5378         int ret;
5379
5380         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5381                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5382                 switch (ret) {
5383                 case -NFS4ERR_DELAY:
5384                 case -NFS4ERR_CLIENTID_BUSY:
5385                         ssleep(1);
5386                         break;
5387                 default:
5388                         return ret;
5389                 }
5390         }
5391         return 0;
5392 }
5393
5394 int nfs4_destroy_clientid(struct nfs_client *clp)
5395 {
5396         struct rpc_cred *cred;
5397         int ret = 0;
5398
5399         if (clp->cl_mvops->minor_version < 1)
5400                 goto out;
5401         if (clp->cl_exchange_flags == 0)
5402                 goto out;
5403         if (clp->cl_preserve_clid)
5404                 goto out;
5405         cred = nfs4_get_exchange_id_cred(clp);
5406         ret = nfs4_proc_destroy_clientid(clp, cred);
5407         if (cred)
5408                 put_rpccred(cred);
5409         switch (ret) {
5410         case 0:
5411         case -NFS4ERR_STALE_CLIENTID:
5412                 clp->cl_exchange_flags = 0;
5413         }
5414 out:
5415         return ret;
5416 }
5417
5418 struct nfs4_get_lease_time_data {
5419         struct nfs4_get_lease_time_args *args;
5420         struct nfs4_get_lease_time_res *res;
5421         struct nfs_client *clp;
5422 };
5423
5424 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5425                                         void *calldata)
5426 {
5427         struct nfs4_get_lease_time_data *data =
5428                         (struct nfs4_get_lease_time_data *)calldata;
5429
5430         dprintk("--> %s\n", __func__);
5431         /* just setup sequence, do not trigger session recovery
5432            since we're invoked within one */
5433         nfs41_setup_sequence(data->clp->cl_session,
5434                         &data->args->la_seq_args,
5435                         &data->res->lr_seq_res,
5436                         task);
5437         dprintk("<-- %s\n", __func__);
5438 }
5439
5440 /*
5441  * Called from nfs4_state_manager thread for session setup, so don't recover
5442  * from sequence operation or clientid errors.
5443  */
5444 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5445 {
5446         struct nfs4_get_lease_time_data *data =
5447                         (struct nfs4_get_lease_time_data *)calldata;
5448
5449         dprintk("--> %s\n", __func__);
5450         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5451                 return;
5452         switch (task->tk_status) {
5453         case -NFS4ERR_DELAY:
5454         case -NFS4ERR_GRACE:
5455                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5456                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5457                 task->tk_status = 0;
5458                 /* fall through */
5459         case -NFS4ERR_RETRY_UNCACHED_REP:
5460                 rpc_restart_call_prepare(task);
5461                 return;
5462         }
5463         dprintk("<-- %s\n", __func__);
5464 }
5465
5466 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5467         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5468         .rpc_call_done = nfs4_get_lease_time_done,
5469 };
5470
5471 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5472 {
5473         struct rpc_task *task;
5474         struct nfs4_get_lease_time_args args;
5475         struct nfs4_get_lease_time_res res = {
5476                 .lr_fsinfo = fsinfo,
5477         };
5478         struct nfs4_get_lease_time_data data = {
5479                 .args = &args,
5480                 .res = &res,
5481                 .clp = clp,
5482         };
5483         struct rpc_message msg = {
5484                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5485                 .rpc_argp = &args,
5486                 .rpc_resp = &res,
5487         };
5488         struct rpc_task_setup task_setup = {
5489                 .rpc_client = clp->cl_rpcclient,
5490                 .rpc_message = &msg,
5491                 .callback_ops = &nfs4_get_lease_time_ops,
5492                 .callback_data = &data,
5493                 .flags = RPC_TASK_TIMEOUT,
5494         };
5495         int status;
5496
5497         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5498         nfs4_set_sequence_privileged(&args.la_seq_args);
5499         dprintk("--> %s\n", __func__);
5500         task = rpc_run_task(&task_setup);
5501
5502         if (IS_ERR(task))
5503                 status = PTR_ERR(task);
5504         else {
5505                 status = task->tk_status;
5506                 rpc_put_task(task);
5507         }
5508         dprintk("<-- %s return %d\n", __func__, status);
5509
5510         return status;
5511 }
5512
5513 /*
5514  * Initialize the values to be used by the client in CREATE_SESSION
5515  * If nfs4_init_session set the fore channel request and response sizes,
5516  * use them.
5517  *
5518  * Set the back channel max_resp_sz_cached to zero to force the client to
5519  * always set csa_cachethis to FALSE because the current implementation
5520  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5521  */
5522 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5523 {
5524         struct nfs4_session *session = args->client->cl_session;
5525         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5526                      mxresp_sz = session->fc_target_max_resp_sz;
5527
5528         if (mxrqst_sz == 0)
5529                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5530         if (mxresp_sz == 0)
5531                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5532         /* Fore channel attributes */
5533         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5534         args->fc_attrs.max_resp_sz = mxresp_sz;
5535         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5536         args->fc_attrs.max_reqs = max_session_slots;
5537
5538         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5539                 "max_ops=%u max_reqs=%u\n",
5540                 __func__,
5541                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5542                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5543
5544         /* Back channel attributes */
5545         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5546         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5547         args->bc_attrs.max_resp_sz_cached = 0;
5548         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5549         args->bc_attrs.max_reqs = 1;
5550
5551         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5552                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5553                 __func__,
5554                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5555                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5556                 args->bc_attrs.max_reqs);
5557 }
5558
5559 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5560 {
5561         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5562         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5563
5564         if (rcvd->max_resp_sz > sent->max_resp_sz)
5565                 return -EINVAL;
5566         /*
5567          * Our requested max_ops is the minimum we need; we're not
5568          * prepared to break up compounds into smaller pieces than that.
5569          * So, no point even trying to continue if the server won't
5570          * cooperate:
5571          */
5572         if (rcvd->max_ops < sent->max_ops)
5573                 return -EINVAL;
5574         if (rcvd->max_reqs == 0)
5575                 return -EINVAL;
5576         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5577                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5578         return 0;
5579 }
5580
5581 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5582 {
5583         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5584         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5585
5586         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5587                 return -EINVAL;
5588         if (rcvd->max_resp_sz < sent->max_resp_sz)
5589                 return -EINVAL;
5590         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5591                 return -EINVAL;
5592         /* These would render the backchannel useless: */
5593         if (rcvd->max_ops != sent->max_ops)
5594                 return -EINVAL;
5595         if (rcvd->max_reqs != sent->max_reqs)
5596                 return -EINVAL;
5597         return 0;
5598 }
5599
5600 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5601                                      struct nfs4_session *session)
5602 {
5603         int ret;
5604
5605         ret = nfs4_verify_fore_channel_attrs(args, session);
5606         if (ret)
5607                 return ret;
5608         return nfs4_verify_back_channel_attrs(args, session);
5609 }
5610
5611 static int _nfs4_proc_create_session(struct nfs_client *clp,
5612                 struct rpc_cred *cred)
5613 {
5614         struct nfs4_session *session = clp->cl_session;
5615         struct nfs41_create_session_args args = {
5616                 .client = clp,
5617                 .cb_program = NFS4_CALLBACK,
5618         };
5619         struct nfs41_create_session_res res = {
5620                 .client = clp,
5621         };
5622         struct rpc_message msg = {
5623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5624                 .rpc_argp = &args,
5625                 .rpc_resp = &res,
5626                 .rpc_cred = cred,
5627         };
5628         int status;
5629
5630         nfs4_init_channel_attrs(&args);
5631         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5632
5633         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5634
5635         if (!status) {
5636                 /* Verify the session's negotiated channel_attrs values */
5637                 status = nfs4_verify_channel_attrs(&args, session);
5638                 /* Increment the clientid slot sequence id */
5639                 clp->cl_seqid++;
5640         }
5641
5642         return status;
5643 }
5644
5645 /*
5646  * Issues a CREATE_SESSION operation to the server.
5647  * It is the responsibility of the caller to verify the session is
5648  * expired before calling this routine.
5649  */
5650 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5651 {
5652         int status;
5653         unsigned *ptr;
5654         struct nfs4_session *session = clp->cl_session;
5655
5656         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5657
5658         status = _nfs4_proc_create_session(clp, cred);
5659         if (status)
5660                 goto out;
5661
5662         /* Init or reset the session slot tables */
5663         status = nfs4_setup_session_slot_tables(session);
5664         dprintk("slot table setup returned %d\n", status);
5665         if (status)
5666                 goto out;
5667
5668         ptr = (unsigned *)&session->sess_id.data[0];
5669         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5670                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5671 out:
5672         dprintk("<-- %s\n", __func__);
5673         return status;
5674 }
5675
5676 /*
5677  * Issue the over-the-wire RPC DESTROY_SESSION.
5678  * The caller must serialize access to this routine.
5679  */
5680 int nfs4_proc_destroy_session(struct nfs4_session *session,
5681                 struct rpc_cred *cred)
5682 {
5683         struct rpc_message msg = {
5684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5685                 .rpc_argp = session,
5686                 .rpc_cred = cred,
5687         };
5688         int status = 0;
5689
5690         dprintk("--> nfs4_proc_destroy_session\n");
5691
5692         /* session is still being setup */
5693         if (session->clp->cl_cons_state != NFS_CS_READY)
5694                 return status;
5695
5696         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5697
5698         if (status)
5699                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5700                         "Session has been destroyed regardless...\n", status);
5701
5702         dprintk("<-- nfs4_proc_destroy_session\n");
5703         return status;
5704 }
5705
5706 /*
5707  * Renew the cl_session lease.
5708  */
5709 struct nfs4_sequence_data {
5710         struct nfs_client *clp;
5711         struct nfs4_sequence_args args;
5712         struct nfs4_sequence_res res;
5713 };
5714
5715 static void nfs41_sequence_release(void *data)
5716 {
5717         struct nfs4_sequence_data *calldata = data;
5718         struct nfs_client *clp = calldata->clp;
5719
5720         if (atomic_read(&clp->cl_count) > 1)
5721                 nfs4_schedule_state_renewal(clp);
5722         nfs_put_client(clp);
5723         kfree(calldata);
5724 }
5725
5726 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5727 {
5728         switch(task->tk_status) {
5729         case -NFS4ERR_DELAY:
5730                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5731                 return -EAGAIN;
5732         default:
5733                 nfs4_schedule_lease_recovery(clp);
5734         }
5735         return 0;
5736 }
5737
5738 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5739 {
5740         struct nfs4_sequence_data *calldata = data;
5741         struct nfs_client *clp = calldata->clp;
5742
5743         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5744                 return;
5745
5746         if (task->tk_status < 0) {
5747                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5748                 if (atomic_read(&clp->cl_count) == 1)
5749                         goto out;
5750
5751                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5752                         rpc_restart_call_prepare(task);
5753                         return;
5754                 }
5755         }
5756         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5757 out:
5758         dprintk("<-- %s\n", __func__);
5759 }
5760
5761 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5762 {
5763         struct nfs4_sequence_data *calldata = data;
5764         struct nfs_client *clp = calldata->clp;
5765         struct nfs4_sequence_args *args;
5766         struct nfs4_sequence_res *res;
5767
5768         args = task->tk_msg.rpc_argp;
5769         res = task->tk_msg.rpc_resp;
5770
5771         nfs41_setup_sequence(clp->cl_session, args, res, task);
5772 }
5773
5774 static const struct rpc_call_ops nfs41_sequence_ops = {
5775         .rpc_call_done = nfs41_sequence_call_done,
5776         .rpc_call_prepare = nfs41_sequence_prepare,
5777         .rpc_release = nfs41_sequence_release,
5778 };
5779
5780 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5781                 struct rpc_cred *cred,
5782                 bool is_privileged)
5783 {
5784         struct nfs4_sequence_data *calldata;
5785         struct rpc_message msg = {
5786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5787                 .rpc_cred = cred,
5788         };
5789         struct rpc_task_setup task_setup_data = {
5790                 .rpc_client = clp->cl_rpcclient,
5791                 .rpc_message = &msg,
5792                 .callback_ops = &nfs41_sequence_ops,
5793                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5794         };
5795
5796         if (!atomic_inc_not_zero(&clp->cl_count))
5797                 return ERR_PTR(-EIO);
5798         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5799         if (calldata == NULL) {
5800                 nfs_put_client(clp);
5801                 return ERR_PTR(-ENOMEM);
5802         }
5803         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5804         if (is_privileged)
5805                 nfs4_set_sequence_privileged(&calldata->args);
5806         msg.rpc_argp = &calldata->args;
5807         msg.rpc_resp = &calldata->res;
5808         calldata->clp = clp;
5809         task_setup_data.callback_data = calldata;
5810
5811         return rpc_run_task(&task_setup_data);
5812 }
5813
5814 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5815 {
5816         struct rpc_task *task;
5817         int ret = 0;
5818
5819         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5820                 return 0;
5821         task = _nfs41_proc_sequence(clp, cred, false);
5822         if (IS_ERR(task))
5823                 ret = PTR_ERR(task);
5824         else
5825                 rpc_put_task_async(task);
5826         dprintk("<-- %s status=%d\n", __func__, ret);
5827         return ret;
5828 }
5829
5830 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5831 {
5832         struct rpc_task *task;
5833         int ret;
5834
5835         task = _nfs41_proc_sequence(clp, cred, true);
5836         if (IS_ERR(task)) {
5837                 ret = PTR_ERR(task);
5838                 goto out;
5839         }
5840         ret = rpc_wait_for_completion_task(task);
5841         if (!ret) {
5842                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5843
5844                 if (task->tk_status == 0)
5845                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5846                 ret = task->tk_status;
5847         }
5848         rpc_put_task(task);
5849 out:
5850         dprintk("<-- %s status=%d\n", __func__, ret);
5851         return ret;
5852 }
5853
5854 struct nfs4_reclaim_complete_data {
5855         struct nfs_client *clp;
5856         struct nfs41_reclaim_complete_args arg;
5857         struct nfs41_reclaim_complete_res res;
5858 };
5859
5860 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5861 {
5862         struct nfs4_reclaim_complete_data *calldata = data;
5863
5864         nfs41_setup_sequence(calldata->clp->cl_session,
5865                         &calldata->arg.seq_args,
5866                         &calldata->res.seq_res,
5867                         task);
5868 }
5869
5870 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5871 {
5872         switch(task->tk_status) {
5873         case 0:
5874         case -NFS4ERR_COMPLETE_ALREADY:
5875         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5876                 break;
5877         case -NFS4ERR_DELAY:
5878                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5879                 /* fall through */
5880         case -NFS4ERR_RETRY_UNCACHED_REP:
5881                 return -EAGAIN;
5882         default:
5883                 nfs4_schedule_lease_recovery(clp);
5884         }
5885         return 0;
5886 }
5887
5888 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5889 {
5890         struct nfs4_reclaim_complete_data *calldata = data;
5891         struct nfs_client *clp = calldata->clp;
5892         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5893
5894         dprintk("--> %s\n", __func__);
5895         if (!nfs41_sequence_done(task, res))
5896                 return;
5897
5898         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5899                 rpc_restart_call_prepare(task);
5900                 return;
5901         }
5902         dprintk("<-- %s\n", __func__);
5903 }
5904
5905 static void nfs4_free_reclaim_complete_data(void *data)
5906 {
5907         struct nfs4_reclaim_complete_data *calldata = data;
5908
5909         kfree(calldata);
5910 }
5911
5912 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5913         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5914         .rpc_call_done = nfs4_reclaim_complete_done,
5915         .rpc_release = nfs4_free_reclaim_complete_data,
5916 };
5917
5918 /*
5919  * Issue a global reclaim complete.
5920  */
5921 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5922 {
5923         struct nfs4_reclaim_complete_data *calldata;
5924         struct rpc_task *task;
5925         struct rpc_message msg = {
5926                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5927         };
5928         struct rpc_task_setup task_setup_data = {
5929                 .rpc_client = clp->cl_rpcclient,
5930                 .rpc_message = &msg,
5931                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5932                 .flags = RPC_TASK_ASYNC,
5933         };
5934         int status = -ENOMEM;
5935
5936         dprintk("--> %s\n", __func__);
5937         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5938         if (calldata == NULL)
5939                 goto out;
5940         calldata->clp = clp;
5941         calldata->arg.one_fs = 0;
5942
5943         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5944         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
5945         msg.rpc_argp = &calldata->arg;
5946         msg.rpc_resp = &calldata->res;
5947         task_setup_data.callback_data = calldata;
5948         task = rpc_run_task(&task_setup_data);
5949         if (IS_ERR(task)) {
5950                 status = PTR_ERR(task);
5951                 goto out;
5952         }
5953         status = nfs4_wait_for_completion_rpc_task(task);
5954         if (status == 0)
5955                 status = task->tk_status;
5956         rpc_put_task(task);
5957         return 0;
5958 out:
5959         dprintk("<-- %s status=%d\n", __func__, status);
5960         return status;
5961 }
5962
5963 static void
5964 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5965 {
5966         struct nfs4_layoutget *lgp = calldata;
5967         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5968         struct nfs4_session *session = nfs4_get_session(server);
5969
5970         dprintk("--> %s\n", __func__);
5971         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5972          * right now covering the LAYOUTGET we are about to send.
5973          * However, that is not so catastrophic, and there seems
5974          * to be no way to prevent it completely.
5975          */
5976         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
5977                                 &lgp->res.seq_res, task))
5978                 return;
5979         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5980                                           NFS_I(lgp->args.inode)->layout,
5981                                           lgp->args.ctx->state)) {
5982                 rpc_exit(task, NFS4_OK);
5983         }
5984 }
5985
5986 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5987 {
5988         struct nfs4_layoutget *lgp = calldata;
5989         struct inode *inode = lgp->args.inode;
5990         struct nfs_server *server = NFS_SERVER(inode);
5991         struct pnfs_layout_hdr *lo;
5992         struct nfs4_state *state = NULL;
5993
5994         dprintk("--> %s\n", __func__);
5995
5996         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
5997                 goto out;
5998
5999         switch (task->tk_status) {
6000         case 0:
6001                 goto out;
6002         case -NFS4ERR_LAYOUTTRYLATER:
6003         case -NFS4ERR_RECALLCONFLICT:
6004                 task->tk_status = -NFS4ERR_DELAY;
6005                 break;
6006         case -NFS4ERR_EXPIRED:
6007         case -NFS4ERR_BAD_STATEID:
6008                 spin_lock(&inode->i_lock);
6009                 lo = NFS_I(inode)->layout;
6010                 if (!lo || list_empty(&lo->plh_segs)) {
6011                         spin_unlock(&inode->i_lock);
6012                         /* If the open stateid was bad, then recover it. */
6013                         state = lgp->args.ctx->state;
6014                 } else {
6015                         LIST_HEAD(head);
6016
6017                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6018                         spin_unlock(&inode->i_lock);
6019                         /* Mark the bad layout state as invalid, then
6020                          * retry using the open stateid. */
6021                         pnfs_free_lseg_list(&head);
6022                 }
6023         }
6024         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6025                 rpc_restart_call_prepare(task);
6026 out:
6027         dprintk("<-- %s\n", __func__);
6028 }
6029
6030 static size_t max_response_pages(struct nfs_server *server)
6031 {
6032         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6033         return nfs_page_array_len(0, max_resp_sz);
6034 }
6035
6036 static void nfs4_free_pages(struct page **pages, size_t size)
6037 {
6038         int i;
6039
6040         if (!pages)
6041                 return;
6042
6043         for (i = 0; i < size; i++) {
6044                 if (!pages[i])
6045                         break;
6046                 __free_page(pages[i]);
6047         }
6048         kfree(pages);
6049 }
6050
6051 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6052 {
6053         struct page **pages;
6054         int i;
6055
6056         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6057         if (!pages) {
6058                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6059                 return NULL;
6060         }
6061
6062         for (i = 0; i < size; i++) {
6063                 pages[i] = alloc_page(gfp_flags);
6064                 if (!pages[i]) {
6065                         dprintk("%s: failed to allocate page\n", __func__);
6066                         nfs4_free_pages(pages, size);
6067                         return NULL;
6068                 }
6069         }
6070
6071         return pages;
6072 }
6073
6074 static void nfs4_layoutget_release(void *calldata)
6075 {
6076         struct nfs4_layoutget *lgp = calldata;
6077         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6078         size_t max_pages = max_response_pages(server);
6079
6080         dprintk("--> %s\n", __func__);
6081         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6082         put_nfs_open_context(lgp->args.ctx);
6083         kfree(calldata);
6084         dprintk("<-- %s\n", __func__);
6085 }
6086
6087 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6088         .rpc_call_prepare = nfs4_layoutget_prepare,
6089         .rpc_call_done = nfs4_layoutget_done,
6090         .rpc_release = nfs4_layoutget_release,
6091 };
6092
6093 struct pnfs_layout_segment *
6094 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6095 {
6096         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6097         size_t max_pages = max_response_pages(server);
6098         struct rpc_task *task;
6099         struct rpc_message msg = {
6100                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6101                 .rpc_argp = &lgp->args,
6102                 .rpc_resp = &lgp->res,
6103         };
6104         struct rpc_task_setup task_setup_data = {
6105                 .rpc_client = server->client,
6106                 .rpc_message = &msg,
6107                 .callback_ops = &nfs4_layoutget_call_ops,
6108                 .callback_data = lgp,
6109                 .flags = RPC_TASK_ASYNC,
6110         };
6111         struct pnfs_layout_segment *lseg = NULL;
6112         int status = 0;
6113
6114         dprintk("--> %s\n", __func__);
6115
6116         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6117         if (!lgp->args.layout.pages) {
6118                 nfs4_layoutget_release(lgp);
6119                 return ERR_PTR(-ENOMEM);
6120         }
6121         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6122
6123         lgp->res.layoutp = &lgp->args.layout;
6124         lgp->res.seq_res.sr_slot = NULL;
6125         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6126         task = rpc_run_task(&task_setup_data);
6127         if (IS_ERR(task))
6128                 return ERR_CAST(task);
6129         status = nfs4_wait_for_completion_rpc_task(task);
6130         if (status == 0)
6131                 status = task->tk_status;
6132         if (status == 0)
6133                 lseg = pnfs_layout_process(lgp);
6134         rpc_put_task(task);
6135         dprintk("<-- %s status=%d\n", __func__, status);
6136         if (status)
6137                 return ERR_PTR(status);
6138         return lseg;
6139 }
6140
6141 static void
6142 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6143 {
6144         struct nfs4_layoutreturn *lrp = calldata;
6145
6146         dprintk("--> %s\n", __func__);
6147         nfs41_setup_sequence(lrp->clp->cl_session,
6148                         &lrp->args.seq_args,
6149                         &lrp->res.seq_res,
6150                         task);
6151 }
6152
6153 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6154 {
6155         struct nfs4_layoutreturn *lrp = calldata;
6156         struct nfs_server *server;
6157
6158         dprintk("--> %s\n", __func__);
6159
6160         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6161                 return;
6162
6163         server = NFS_SERVER(lrp->args.inode);
6164         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6165                 rpc_restart_call_prepare(task);
6166                 return;
6167         }
6168         dprintk("<-- %s\n", __func__);
6169 }
6170
6171 static void nfs4_layoutreturn_release(void *calldata)
6172 {
6173         struct nfs4_layoutreturn *lrp = calldata;
6174         struct pnfs_layout_hdr *lo = lrp->args.layout;
6175
6176         dprintk("--> %s\n", __func__);
6177         spin_lock(&lo->plh_inode->i_lock);
6178         if (lrp->res.lrs_present)
6179                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6180         lo->plh_block_lgets--;
6181         spin_unlock(&lo->plh_inode->i_lock);
6182         pnfs_put_layout_hdr(lrp->args.layout);
6183         kfree(calldata);
6184         dprintk("<-- %s\n", __func__);
6185 }
6186
6187 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6188         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6189         .rpc_call_done = nfs4_layoutreturn_done,
6190         .rpc_release = nfs4_layoutreturn_release,
6191 };
6192
6193 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6194 {
6195         struct rpc_task *task;
6196         struct rpc_message msg = {
6197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6198                 .rpc_argp = &lrp->args,
6199                 .rpc_resp = &lrp->res,
6200         };
6201         struct rpc_task_setup task_setup_data = {
6202                 .rpc_client = lrp->clp->cl_rpcclient,
6203                 .rpc_message = &msg,
6204                 .callback_ops = &nfs4_layoutreturn_call_ops,
6205                 .callback_data = lrp,
6206         };
6207         int status;
6208
6209         dprintk("--> %s\n", __func__);
6210         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6211         task = rpc_run_task(&task_setup_data);
6212         if (IS_ERR(task))
6213                 return PTR_ERR(task);
6214         status = task->tk_status;
6215         dprintk("<-- %s status=%d\n", __func__, status);
6216         rpc_put_task(task);
6217         return status;
6218 }
6219
6220 /*
6221  * Retrieve the list of Data Server devices from the MDS.
6222  */
6223 static int _nfs4_getdevicelist(struct nfs_server *server,
6224                                     const struct nfs_fh *fh,
6225                                     struct pnfs_devicelist *devlist)
6226 {
6227         struct nfs4_getdevicelist_args args = {
6228                 .fh = fh,
6229                 .layoutclass = server->pnfs_curr_ld->id,
6230         };
6231         struct nfs4_getdevicelist_res res = {
6232                 .devlist = devlist,
6233         };
6234         struct rpc_message msg = {
6235                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6236                 .rpc_argp = &args,
6237                 .rpc_resp = &res,
6238         };
6239         int status;
6240
6241         dprintk("--> %s\n", __func__);
6242         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6243                                 &res.seq_res, 0);
6244         dprintk("<-- %s status=%d\n", __func__, status);
6245         return status;
6246 }
6247
6248 int nfs4_proc_getdevicelist(struct nfs_server *server,
6249                             const struct nfs_fh *fh,
6250                             struct pnfs_devicelist *devlist)
6251 {
6252         struct nfs4_exception exception = { };
6253         int err;
6254
6255         do {
6256                 err = nfs4_handle_exception(server,
6257                                 _nfs4_getdevicelist(server, fh, devlist),
6258                                 &exception);
6259         } while (exception.retry);
6260
6261         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6262                 err, devlist->num_devs);
6263
6264         return err;
6265 }
6266 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6267
6268 static int
6269 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6270 {
6271         struct nfs4_getdeviceinfo_args args = {
6272                 .pdev = pdev,
6273         };
6274         struct nfs4_getdeviceinfo_res res = {
6275                 .pdev = pdev,
6276         };
6277         struct rpc_message msg = {
6278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6279                 .rpc_argp = &args,
6280                 .rpc_resp = &res,
6281         };
6282         int status;
6283
6284         dprintk("--> %s\n", __func__);
6285         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6286         dprintk("<-- %s status=%d\n", __func__, status);
6287
6288         return status;
6289 }
6290
6291 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6292 {
6293         struct nfs4_exception exception = { };
6294         int err;
6295
6296         do {
6297                 err = nfs4_handle_exception(server,
6298                                         _nfs4_proc_getdeviceinfo(server, pdev),
6299                                         &exception);
6300         } while (exception.retry);
6301         return err;
6302 }
6303 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6304
6305 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6306 {
6307         struct nfs4_layoutcommit_data *data = calldata;
6308         struct nfs_server *server = NFS_SERVER(data->args.inode);
6309         struct nfs4_session *session = nfs4_get_session(server);
6310
6311         nfs41_setup_sequence(session,
6312                         &data->args.seq_args,
6313                         &data->res.seq_res,
6314                         task);
6315 }
6316
6317 static void
6318 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6319 {
6320         struct nfs4_layoutcommit_data *data = calldata;
6321         struct nfs_server *server = NFS_SERVER(data->args.inode);
6322
6323         if (!nfs41_sequence_done(task, &data->res.seq_res))
6324                 return;
6325
6326         switch (task->tk_status) { /* Just ignore these failures */
6327         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6328         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6329         case -NFS4ERR_BADLAYOUT:     /* no layout */
6330         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6331                 task->tk_status = 0;
6332                 break;
6333         case 0:
6334                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6335                                                    data->res.fattr);
6336                 break;
6337         default:
6338                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6339                         rpc_restart_call_prepare(task);
6340                         return;
6341                 }
6342         }
6343 }
6344
6345 static void nfs4_layoutcommit_release(void *calldata)
6346 {
6347         struct nfs4_layoutcommit_data *data = calldata;
6348         struct pnfs_layout_segment *lseg, *tmp;
6349         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6350
6351         pnfs_cleanup_layoutcommit(data);
6352         /* Matched by references in pnfs_set_layoutcommit */
6353         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6354                 list_del_init(&lseg->pls_lc_list);
6355                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6356                                        &lseg->pls_flags))
6357                         pnfs_put_lseg(lseg);
6358         }
6359
6360         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6361         smp_mb__after_clear_bit();
6362         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6363
6364         put_rpccred(data->cred);
6365         kfree(data);
6366 }
6367
6368 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6369         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6370         .rpc_call_done = nfs4_layoutcommit_done,
6371         .rpc_release = nfs4_layoutcommit_release,
6372 };
6373
6374 int
6375 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6376 {
6377         struct rpc_message msg = {
6378                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6379                 .rpc_argp = &data->args,
6380                 .rpc_resp = &data->res,
6381                 .rpc_cred = data->cred,
6382         };
6383         struct rpc_task_setup task_setup_data = {
6384                 .task = &data->task,
6385                 .rpc_client = NFS_CLIENT(data->args.inode),
6386                 .rpc_message = &msg,
6387                 .callback_ops = &nfs4_layoutcommit_ops,
6388                 .callback_data = data,
6389                 .flags = RPC_TASK_ASYNC,
6390         };
6391         struct rpc_task *task;
6392         int status = 0;
6393
6394         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6395                 "lbw: %llu inode %lu\n",
6396                 data->task.tk_pid, sync,
6397                 data->args.lastbytewritten,
6398                 data->args.inode->i_ino);
6399
6400         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6401         task = rpc_run_task(&task_setup_data);
6402         if (IS_ERR(task))
6403                 return PTR_ERR(task);
6404         if (sync == false)
6405                 goto out;
6406         status = nfs4_wait_for_completion_rpc_task(task);
6407         if (status != 0)
6408                 goto out;
6409         status = task->tk_status;
6410 out:
6411         dprintk("%s: status %d\n", __func__, status);
6412         rpc_put_task(task);
6413         return status;
6414 }
6415
6416 static int
6417 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6418                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6419 {
6420         struct nfs41_secinfo_no_name_args args = {
6421                 .style = SECINFO_STYLE_CURRENT_FH,
6422         };
6423         struct nfs4_secinfo_res res = {
6424                 .flavors = flavors,
6425         };
6426         struct rpc_message msg = {
6427                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6428                 .rpc_argp = &args,
6429                 .rpc_resp = &res,
6430         };
6431         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6432 }
6433
6434 static int
6435 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6436                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6437 {
6438         struct nfs4_exception exception = { };
6439         int err;
6440         do {
6441                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6442                 switch (err) {
6443                 case 0:
6444                 case -NFS4ERR_WRONGSEC:
6445                 case -NFS4ERR_NOTSUPP:
6446                         goto out;
6447                 default:
6448                         err = nfs4_handle_exception(server, err, &exception);
6449                 }
6450         } while (exception.retry);
6451 out:
6452         return err;
6453 }
6454
6455 static int
6456 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6457                     struct nfs_fsinfo *info)
6458 {
6459         int err;
6460         struct page *page;
6461         rpc_authflavor_t flavor;
6462         struct nfs4_secinfo_flavors *flavors;
6463
6464         page = alloc_page(GFP_KERNEL);
6465         if (!page) {
6466                 err = -ENOMEM;
6467                 goto out;
6468         }
6469
6470         flavors = page_address(page);
6471         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6472
6473         /*
6474          * Fall back on "guess and check" method if
6475          * the server doesn't support SECINFO_NO_NAME
6476          */
6477         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6478                 err = nfs4_find_root_sec(server, fhandle, info);
6479                 goto out_freepage;
6480         }
6481         if (err)
6482                 goto out_freepage;
6483
6484         flavor = nfs_find_best_sec(flavors);
6485         if (err == 0)
6486                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6487
6488 out_freepage:
6489         put_page(page);
6490         if (err == -EACCES)
6491                 return -EPERM;
6492 out:
6493         return err;
6494 }
6495
6496 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6497 {
6498         int status;
6499         struct nfs41_test_stateid_args args = {
6500                 .stateid = stateid,
6501         };
6502         struct nfs41_test_stateid_res res;
6503         struct rpc_message msg = {
6504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6505                 .rpc_argp = &args,
6506                 .rpc_resp = &res,
6507         };
6508
6509         dprintk("NFS call  test_stateid %p\n", stateid);
6510         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6511         nfs4_set_sequence_privileged(&args.seq_args);
6512         status = nfs4_call_sync_sequence(server->client, server, &msg,
6513                         &args.seq_args, &res.seq_res);
6514         if (status != NFS_OK) {
6515                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6516                 return status;
6517         }
6518         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6519         return -res.status;
6520 }
6521
6522 /**
6523  * nfs41_test_stateid - perform a TEST_STATEID operation
6524  *
6525  * @server: server / transport on which to perform the operation
6526  * @stateid: state ID to test
6527  *
6528  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6529  * Otherwise a negative NFS4ERR value is returned if the operation
6530  * failed or the state ID is not currently valid.
6531  */
6532 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6533 {
6534         struct nfs4_exception exception = { };
6535         int err;
6536         do {
6537                 err = _nfs41_test_stateid(server, stateid);
6538                 if (err != -NFS4ERR_DELAY)
6539                         break;
6540                 nfs4_handle_exception(server, err, &exception);
6541         } while (exception.retry);
6542         return err;
6543 }
6544
6545 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6546 {
6547         struct nfs41_free_stateid_args args = {
6548                 .stateid = stateid,
6549         };
6550         struct nfs41_free_stateid_res res;
6551         struct rpc_message msg = {
6552                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6553                 .rpc_argp = &args,
6554                 .rpc_resp = &res,
6555         };
6556         int status;
6557
6558         dprintk("NFS call  free_stateid %p\n", stateid);
6559         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6560         nfs4_set_sequence_privileged(&args.seq_args);
6561         status = nfs4_call_sync_sequence(server->client, server, &msg,
6562                         &args.seq_args, &res.seq_res);
6563         dprintk("NFS reply free_stateid: %d\n", status);
6564         return status;
6565 }
6566
6567 /**
6568  * nfs41_free_stateid - perform a FREE_STATEID operation
6569  *
6570  * @server: server / transport on which to perform the operation
6571  * @stateid: state ID to release
6572  *
6573  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6574  * negative NFS4ERR value is returned.
6575  */
6576 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6577 {
6578         struct nfs4_exception exception = { };
6579         int err;
6580         do {
6581                 err = _nfs4_free_stateid(server, stateid);
6582                 if (err != -NFS4ERR_DELAY)
6583                         break;
6584                 nfs4_handle_exception(server, err, &exception);
6585         } while (exception.retry);
6586         return err;
6587 }
6588
6589 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6590                 const nfs4_stateid *s2)
6591 {
6592         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6593                 return false;
6594
6595         if (s1->seqid == s2->seqid)
6596                 return true;
6597         if (s1->seqid == 0 || s2->seqid == 0)
6598                 return true;
6599
6600         return false;
6601 }
6602
6603 #endif /* CONFIG_NFS_V4_1 */
6604
6605 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6606                 const nfs4_stateid *s2)
6607 {
6608         return nfs4_stateid_match(s1, s2);
6609 }
6610
6611
6612 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6613         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6614         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6615         .recover_open   = nfs4_open_reclaim,
6616         .recover_lock   = nfs4_lock_reclaim,
6617         .establish_clid = nfs4_init_clientid,
6618         .get_clid_cred  = nfs4_get_setclientid_cred,
6619         .detect_trunking = nfs40_discover_server_trunking,
6620 };
6621
6622 #if defined(CONFIG_NFS_V4_1)
6623 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6624         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6625         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6626         .recover_open   = nfs4_open_reclaim,
6627         .recover_lock   = nfs4_lock_reclaim,
6628         .establish_clid = nfs41_init_clientid,
6629         .get_clid_cred  = nfs4_get_exchange_id_cred,
6630         .reclaim_complete = nfs41_proc_reclaim_complete,
6631         .detect_trunking = nfs41_discover_server_trunking,
6632 };
6633 #endif /* CONFIG_NFS_V4_1 */
6634
6635 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6636         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6637         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6638         .recover_open   = nfs4_open_expired,
6639         .recover_lock   = nfs4_lock_expired,
6640         .establish_clid = nfs4_init_clientid,
6641         .get_clid_cred  = nfs4_get_setclientid_cred,
6642 };
6643
6644 #if defined(CONFIG_NFS_V4_1)
6645 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6646         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6647         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6648         .recover_open   = nfs41_open_expired,
6649         .recover_lock   = nfs41_lock_expired,
6650         .establish_clid = nfs41_init_clientid,
6651         .get_clid_cred  = nfs4_get_exchange_id_cred,
6652 };
6653 #endif /* CONFIG_NFS_V4_1 */
6654
6655 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6656         .sched_state_renewal = nfs4_proc_async_renew,
6657         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6658         .renew_lease = nfs4_proc_renew,
6659 };
6660
6661 #if defined(CONFIG_NFS_V4_1)
6662 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6663         .sched_state_renewal = nfs41_proc_async_sequence,
6664         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6665         .renew_lease = nfs4_proc_sequence,
6666 };
6667 #endif
6668
6669 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6670         .minor_version = 0,
6671         .call_sync = _nfs4_call_sync,
6672         .match_stateid = nfs4_match_stateid,
6673         .find_root_sec = nfs4_find_root_sec,
6674         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6675         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6676         .state_renewal_ops = &nfs40_state_renewal_ops,
6677 };
6678
6679 #if defined(CONFIG_NFS_V4_1)
6680 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6681         .minor_version = 1,
6682         .call_sync = nfs4_call_sync_sequence,
6683         .match_stateid = nfs41_match_stateid,
6684         .find_root_sec = nfs41_find_root_sec,
6685         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6686         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6687         .state_renewal_ops = &nfs41_state_renewal_ops,
6688 };
6689 #endif
6690
6691 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6692         [0] = &nfs_v4_0_minor_ops,
6693 #if defined(CONFIG_NFS_V4_1)
6694         [1] = &nfs_v4_1_minor_ops,
6695 #endif
6696 };
6697
6698 const struct inode_operations nfs4_dir_inode_operations = {
6699         .create         = nfs_create,
6700         .lookup         = nfs_lookup,
6701         .atomic_open    = nfs_atomic_open,
6702         .link           = nfs_link,
6703         .unlink         = nfs_unlink,
6704         .symlink        = nfs_symlink,
6705         .mkdir          = nfs_mkdir,
6706         .rmdir          = nfs_rmdir,
6707         .mknod          = nfs_mknod,
6708         .rename         = nfs_rename,
6709         .permission     = nfs_permission,
6710         .getattr        = nfs_getattr,
6711         .setattr        = nfs_setattr,
6712         .getxattr       = generic_getxattr,
6713         .setxattr       = generic_setxattr,
6714         .listxattr      = generic_listxattr,
6715         .removexattr    = generic_removexattr,
6716 };
6717
6718 static const struct inode_operations nfs4_file_inode_operations = {
6719         .permission     = nfs_permission,
6720         .getattr        = nfs_getattr,
6721         .setattr        = nfs_setattr,
6722         .getxattr       = generic_getxattr,
6723         .setxattr       = generic_setxattr,
6724         .listxattr      = generic_listxattr,
6725         .removexattr    = generic_removexattr,
6726 };
6727
6728 const struct nfs_rpc_ops nfs_v4_clientops = {
6729         .version        = 4,                    /* protocol version */
6730         .dentry_ops     = &nfs4_dentry_operations,
6731         .dir_inode_ops  = &nfs4_dir_inode_operations,
6732         .file_inode_ops = &nfs4_file_inode_operations,
6733         .file_ops       = &nfs4_file_operations,
6734         .getroot        = nfs4_proc_get_root,
6735         .submount       = nfs4_submount,
6736         .try_mount      = nfs4_try_mount,
6737         .getattr        = nfs4_proc_getattr,
6738         .setattr        = nfs4_proc_setattr,
6739         .lookup         = nfs4_proc_lookup,
6740         .access         = nfs4_proc_access,
6741         .readlink       = nfs4_proc_readlink,
6742         .create         = nfs4_proc_create,
6743         .remove         = nfs4_proc_remove,
6744         .unlink_setup   = nfs4_proc_unlink_setup,
6745         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6746         .unlink_done    = nfs4_proc_unlink_done,
6747         .rename         = nfs4_proc_rename,
6748         .rename_setup   = nfs4_proc_rename_setup,
6749         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6750         .rename_done    = nfs4_proc_rename_done,
6751         .link           = nfs4_proc_link,
6752         .symlink        = nfs4_proc_symlink,
6753         .mkdir          = nfs4_proc_mkdir,
6754         .rmdir          = nfs4_proc_remove,
6755         .readdir        = nfs4_proc_readdir,
6756         .mknod          = nfs4_proc_mknod,
6757         .statfs         = nfs4_proc_statfs,
6758         .fsinfo         = nfs4_proc_fsinfo,
6759         .pathconf       = nfs4_proc_pathconf,
6760         .set_capabilities = nfs4_server_capabilities,
6761         .decode_dirent  = nfs4_decode_dirent,
6762         .read_setup     = nfs4_proc_read_setup,
6763         .read_pageio_init = pnfs_pageio_init_read,
6764         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6765         .read_done      = nfs4_read_done,
6766         .write_setup    = nfs4_proc_write_setup,
6767         .write_pageio_init = pnfs_pageio_init_write,
6768         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6769         .write_done     = nfs4_write_done,
6770         .commit_setup   = nfs4_proc_commit_setup,
6771         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6772         .commit_done    = nfs4_commit_done,
6773         .lock           = nfs4_proc_lock,
6774         .clear_acl_cache = nfs4_zap_acl_attr,
6775         .close_context  = nfs4_close_context,
6776         .open_context   = nfs4_atomic_open,
6777         .have_delegation = nfs4_have_delegation,
6778         .return_delegation = nfs4_inode_return_delegation,
6779         .alloc_client   = nfs4_alloc_client,
6780         .init_client    = nfs4_init_client,
6781         .free_client    = nfs4_free_client,
6782         .create_server  = nfs4_create_server,
6783         .clone_server   = nfs_clone_server,
6784 };
6785
6786 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6787         .prefix = XATTR_NAME_NFSV4_ACL,
6788         .list   = nfs4_xattr_list_nfs4_acl,
6789         .get    = nfs4_xattr_get_nfs4_acl,
6790         .set    = nfs4_xattr_set_nfs4_acl,
6791 };
6792
6793 const struct xattr_handler *nfs4_xattr_handlers[] = {
6794         &nfs4_xattr_nfs4_acl_handler,
6795         NULL
6796 };
6797
6798 /*
6799  * Local variables:
6800  *  c-basic-offset: 8
6801  * End:
6802  */