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                 case -EKEYEXPIRED:
 337                         ret = nfs4_delay(server->client, &exception->timeout);
 338                         if (ret != 0)
 339                                 break;
 340                 case -NFS4ERR_RETRY_UNCACHED_REP:
 341                 case -NFS4ERR_OLD_STATEID:
 342                         exception->retry = 1;
 343                         break;
 344                 case -NFS4ERR_BADOWNER:
 345                         /* The following works around a Linux server bug! */
 346                 case -NFS4ERR_BADNAME:
 347                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 348                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 349                                 exception->retry = 1;
 350                                 printk(KERN_WARNING "NFS: v4 server %s "
 351                                                 "does not accept raw "
 352                                                 "uid/gids. "
 353                                                 "Reenabling the idmapper.\n",
 354                                                 server->nfs_client->cl_hostname);
 355                         }
 356         }
 357         /* We failed to handle the error */
 358         return nfs4_map_errors(ret);
 359 wait_on_recovery:
 360         ret = nfs4_wait_clnt_recover(clp);
 361         if (ret == 0)
 362                 exception->retry = 1;
 363         return ret;
 364 }
 365
 366
 367 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 368 {
 369         spin_lock(&clp->cl_lock);
 370         if (time_before(clp->cl_last_renewal,timestamp))
 371                 clp->cl_last_renewal = timestamp;
 372         spin_unlock(&clp->cl_lock);
 373 }
 374
 375 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 376 {
 377         do_renew_lease(server->nfs_client, timestamp);
 378 }
 379
 380 #if defined(CONFIG_NFS_V4_1)
 381
 382 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 383 {
 384         struct nfs4_session *session;
 385         struct nfs4_slot_table *tbl;
 386         bool send_new_highest_used_slotid = false;
 387
 388         if (!res->sr_slot) {
 389                 /* just wake up the next guy waiting since
 390                  * we may have not consumed a slot after all */
 391                 dprintk("%s: No slot\n", __func__);
 392                 return;
 393         }
 394         tbl = res->sr_slot->table;
 395         session = tbl->session;
 396
 397         spin_lock(&tbl->slot_tbl_lock);
 398         /* Be nice to the server: try to ensure that the last transmitted
 399          * value for highest_user_slotid <= target_highest_slotid
 400          */
 401         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 402                 send_new_highest_used_slotid = true;
 403
 404         nfs4_free_slot(tbl, res->sr_slot);
 405
 406         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 407                 send_new_highest_used_slotid = false;
 408         if (!nfs4_session_draining(session)) {
 409                 if (rpc_wake_up_next(&tbl->slot_tbl_waitq) != NULL)
 410                         send_new_highest_used_slotid = false;
 411         }
 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         unsigned long timestamp;
 423         struct nfs_client *clp;
 424
 425         /*
 426          * sr_status remains 1 if an RPC level error occurred. The server
 427          * may or may not have processed the sequence operation..
 428          * Proceed as if the server received and processed the sequence
 429          * operation.
 430          */
 431         if (res->sr_status == 1)
 432                 res->sr_status = NFS_OK;
 433
 434         /* don't increment the sequence number if the task wasn't sent */
 435         if (!RPC_WAS_SENT(task))
 436                 goto out;
 437
 438         slot = res->sr_slot;
 439         session = slot->table->session;
 440
 441         /* Check the SEQUENCE operation status */
 442         switch (res->sr_status) {
 443         case 0:
 444                 /* Update the slot's sequence and clientid lease timer */
 445                 ++slot->seq_nr;
 446                 timestamp = slot->renewal_time;
 447                 clp = session->clp;
 448                 do_renew_lease(clp, timestamp);
 449                 /* Check sequence flags */
 450                 if (res->sr_status_flags != 0)
 451                         nfs4_schedule_lease_recovery(clp);
 452                 nfs41_update_target_slotid(slot->table, slot, res);
 453                 break;
 454         case -NFS4ERR_DELAY:
 455                 /* The server detected a resend of the RPC call and
 456                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 457                  * of RFC5661.
 458                  */
 459                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 460                         __func__,
 461                         slot->slot_nr,
 462                         slot->seq_nr);
 463                 goto out_retry;
 464         default:
 465                 /* Just update the slot sequence no. */
 466                 ++slot->seq_nr;
 467         }
 468 out:
 469         /* The session may be reset by one of the error handlers. */
 470         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 471         nfs41_sequence_free_slot(res);
 472         return 1;
 473 out_retry:
 474         if (!rpc_restart_call(task))
 475                 goto out;
 476         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 477         return 0;
 478 }
 479
 480 static int nfs4_sequence_done(struct rpc_task *task,
 481                                struct nfs4_sequence_res *res)
 482 {
 483         if (res->sr_slot == NULL)
 484                 return 1;
 485         return nfs41_sequence_done(task, res);
 486 }
 487
 488 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 489                 struct nfs4_sequence_res *res, int cache_reply)
 490 {
 491         args->sa_slot = NULL;
 492         args->sa_cache_this = 0;
 493         if (cache_reply)
 494                 args->sa_cache_this = 1;
 495         res->sr_slot = NULL;
 496 }
 497
 498 int nfs41_setup_sequence(struct nfs4_session *session,
 499                                 struct nfs4_sequence_args *args,
 500                                 struct nfs4_sequence_res *res,
 501                                 struct rpc_task *task)
 502 {
 503         struct nfs4_slot *slot;
 504         struct nfs4_slot_table *tbl;
 505
 506         dprintk("--> %s\n", __func__);
 507         /* slot already allocated? */
 508         if (res->sr_slot != NULL)
 509                 goto out_success;
 510
 511         tbl = &session->fc_slot_table;
 512
 513         task->tk_timeout = 0;
 514
 515         spin_lock(&tbl->slot_tbl_lock);
 516         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 517             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 518                 /* The state manager will wait until the slot table is empty */
 519                 dprintk("%s session is draining\n", __func__);
 520                 goto out_sleep;
 521         }
 522
 523         slot = nfs4_alloc_slot(tbl);
 524         if (IS_ERR(slot)) {
 525                 /* If out of memory, try again in 1/4 second */
 526                 if (slot == ERR_PTR(-ENOMEM))
 527                         task->tk_timeout = HZ >> 2;
 528                 dprintk("<-- %s: no free slots\n", __func__);
 529                 goto out_sleep;
 530         }
 531         spin_unlock(&tbl->slot_tbl_lock);
 532
 533         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 534
 535         args->sa_slot = slot;
 536
 537         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 538                         slot->slot_nr, slot->seq_nr);
 539
 540         res->sr_slot = slot;
 541         res->sr_status_flags = 0;
 542         /*
 543          * sr_status is only set in decode_sequence, and so will remain
 544          * set to 1 if an rpc level failure occurs.
 545          */
 546         res->sr_status = 1;
 547 out_success:
 548         rpc_call_start(task);
 549         return 0;
 550 out_sleep:
 551         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 552         spin_unlock(&tbl->slot_tbl_lock);
 553         return -EAGAIN;
 554 }
 555 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 556
 557 int nfs4_setup_sequence(const struct nfs_server *server,
 558                         struct nfs4_sequence_args *args,
 559                         struct nfs4_sequence_res *res,
 560                         struct rpc_task *task)
 561 {
 562         struct nfs4_session *session = nfs4_get_session(server);
 563         int ret = 0;
 564
 565         if (session == NULL) {
 566                 rpc_call_start(task);
 567                 goto out;
 568         }
 569
 570         dprintk("--> %s clp %p session %p sr_slot %d\n",
 571                 __func__, session->clp, session, res->sr_slot ?
 572                         res->sr_slot->slot_nr : -1);
 573
 574         ret = nfs41_setup_sequence(session, args, res, task);
 575 out:
 576         dprintk("<-- %s status=%d\n", __func__, ret);
 577         return ret;
 578 }
 579
 580 struct nfs41_call_sync_data {
 581         const struct nfs_server *seq_server;
 582         struct nfs4_sequence_args *seq_args;
 583         struct nfs4_sequence_res *seq_res;
 584 };
 585
 586 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 587 {
 588         struct nfs41_call_sync_data *data = calldata;
 589         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 590
 591         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 592
 593         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 594 }
 595
 596 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 597 {
 598         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 599         nfs41_call_sync_prepare(task, calldata);
 600 }
 601
 602 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 603 {
 604         struct nfs41_call_sync_data *data = calldata;
 605
 606         nfs41_sequence_done(task, data->seq_res);
 607 }
 608
 609 static const struct rpc_call_ops nfs41_call_sync_ops = {
 610         .rpc_call_prepare = nfs41_call_sync_prepare,
 611         .rpc_call_done = nfs41_call_sync_done,
 612 };
 613
 614 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 615         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 616         .rpc_call_done = nfs41_call_sync_done,
 617 };
 618
 619 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 620                                    struct nfs_server *server,
 621                                    struct rpc_message *msg,
 622                                    struct nfs4_sequence_args *args,
 623                                    struct nfs4_sequence_res *res,
 624                                    int privileged)
 625 {
 626         int ret;
 627         struct rpc_task *task;
 628         struct nfs41_call_sync_data data = {
 629                 .seq_server = server,
 630                 .seq_args = args,
 631                 .seq_res = res,
 632         };
 633         struct rpc_task_setup task_setup = {
 634                 .rpc_client = clnt,
 635                 .rpc_message = msg,
 636                 .callback_ops = &nfs41_call_sync_ops,
 637                 .callback_data = &data
 638         };
 639
 640         if (privileged)
 641                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 642         task = rpc_run_task(&task_setup);
 643         if (IS_ERR(task))
 644                 ret = PTR_ERR(task);
 645         else {
 646                 ret = task->tk_status;
 647                 rpc_put_task(task);
 648         }
 649         return ret;
 650 }
 651
 652 static
 653 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 654                             struct nfs_server *server,
 655                             struct rpc_message *msg,
 656                             struct nfs4_sequence_args *args,
 657                             struct nfs4_sequence_res *res)
 658 {
 659         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 660 }
 661
 662 #else
 663 static inline
 664 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 665                 struct nfs4_sequence_res *res, int cache_reply)
 666 {
 667 }
 668
 669 static int nfs4_sequence_done(struct rpc_task *task,
 670                                struct nfs4_sequence_res *res)
 671 {
 672         return 1;
 673 }
 674 #endif /* CONFIG_NFS_V4_1 */
 675
 676 static
 677 int _nfs4_call_sync(struct rpc_clnt *clnt,
 678                     struct nfs_server *server,
 679                     struct rpc_message *msg,
 680                     struct nfs4_sequence_args *args,
 681                     struct nfs4_sequence_res *res)
 682 {
 683         return rpc_call_sync(clnt, msg, 0);
 684 }
 685
 686 static
 687 int nfs4_call_sync(struct rpc_clnt *clnt,
 688                    struct nfs_server *server,
 689                    struct rpc_message *msg,
 690                    struct nfs4_sequence_args *args,
 691                    struct nfs4_sequence_res *res,
 692                    int cache_reply)
 693 {
 694         nfs41_init_sequence(args, res, cache_reply);
 695         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 696                                                 args, res);
 697 }
 698
 699 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 700 {
 701         struct nfs_inode *nfsi = NFS_I(dir);
 702
 703         spin_lock(&dir->i_lock);
 704         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 705         if (!cinfo->atomic || cinfo->before != dir->i_version)
 706                 nfs_force_lookup_revalidate(dir);
 707         dir->i_version = cinfo->after;
 708         spin_unlock(&dir->i_lock);
 709 }
 710
 711 struct nfs4_opendata {
 712         struct kref kref;
 713         struct nfs_openargs o_arg;
 714         struct nfs_openres o_res;
 715         struct nfs_open_confirmargs c_arg;
 716         struct nfs_open_confirmres c_res;
 717         struct nfs4_string owner_name;
 718         struct nfs4_string group_name;
 719         struct nfs_fattr f_attr;
 720         struct dentry *dir;
 721         struct dentry *dentry;
 722         struct nfs4_state_owner *owner;
 723         struct nfs4_state *state;
 724         struct iattr attrs;
 725         unsigned long timestamp;
 726         unsigned int rpc_done : 1;
 727         int rpc_status;
 728         int cancelled;
 729 };
 730
 731
 732 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 733 {
 734         p->o_res.f_attr = &p->f_attr;
 735         p->o_res.seqid = p->o_arg.seqid;
 736         p->c_res.seqid = p->c_arg.seqid;
 737         p->o_res.server = p->o_arg.server;
 738         p->o_res.access_request = p->o_arg.access;
 739         nfs_fattr_init(&p->f_attr);
 740         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 741 }
 742
 743 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 744                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 745                 const struct iattr *attrs,
 746                 gfp_t gfp_mask)
 747 {
 748         struct dentry *parent = dget_parent(dentry);
 749         struct inode *dir = parent->d_inode;
 750         struct nfs_server *server = NFS_SERVER(dir);
 751         struct nfs4_opendata *p;
 752
 753         p = kzalloc(sizeof(*p), gfp_mask);
 754         if (p == NULL)
 755                 goto err;
 756         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 757         if (p->o_arg.seqid == NULL)
 758                 goto err_free;
 759         nfs_sb_active(dentry->d_sb);
 760         p->dentry = dget(dentry);
 761         p->dir = parent;
 762         p->owner = sp;
 763         atomic_inc(&sp->so_count);
 764         p->o_arg.fh = NFS_FH(dir);
 765         p->o_arg.open_flags = flags;
 766         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 767         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 768          * will return permission denied for all bits until close */
 769         if (!(flags & O_EXCL)) {
 770                 /* ask server to check for all possible rights as results
 771                  * are cached */
 772                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 773                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 774         }
 775         p->o_arg.clientid = server->nfs_client->cl_clientid;
 776         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 777         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 778         p->o_arg.name = &dentry->d_name;
 779         p->o_arg.server = server;
 780         p->o_arg.bitmask = server->attr_bitmask;
 781         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 782         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 783         if (attrs != NULL && attrs->ia_valid != 0) {
 784                 __be32 verf[2];
 785
 786                 p->o_arg.u.attrs = &p->attrs;
 787                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 788
 789                 verf[0] = jiffies;
 790                 verf[1] = current->pid;
 791                 memcpy(p->o_arg.u.verifier.data, verf,
 792                                 sizeof(p->o_arg.u.verifier.data));
 793         }
 794         p->c_arg.fh = &p->o_res.fh;
 795         p->c_arg.stateid = &p->o_res.stateid;
 796         p->c_arg.seqid = p->o_arg.seqid;
 797         nfs4_init_opendata_res(p);
 798         kref_init(&p->kref);
 799         return p;
 800 err_free:
 801         kfree(p);
 802 err:
 803         dput(parent);
 804         return NULL;
 805 }
 806
 807 static void nfs4_opendata_free(struct kref *kref)
 808 {
 809         struct nfs4_opendata *p = container_of(kref,
 810                         struct nfs4_opendata, kref);
 811         struct super_block *sb = p->dentry->d_sb;
 812
 813         nfs_free_seqid(p->o_arg.seqid);
 814         if (p->state != NULL)
 815                 nfs4_put_open_state(p->state);
 816         nfs4_put_state_owner(p->owner);
 817         dput(p->dir);
 818         dput(p->dentry);
 819         nfs_sb_deactive(sb);
 820         nfs_fattr_free_names(&p->f_attr);
 821         kfree(p);
 822 }
 823
 824 static void nfs4_opendata_put(struct nfs4_opendata *p)
 825 {
 826         if (p != NULL)
 827                 kref_put(&p->kref, nfs4_opendata_free);
 828 }
 829
 830 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 831 {
 832         int ret;
 833
 834         ret = rpc_wait_for_completion_task(task);
 835         return ret;
 836 }
 837
 838 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 839 {
 840         int ret = 0;
 841
 842         if (open_mode & (O_EXCL|O_TRUNC))
 843                 goto out;
 844         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 845                 case FMODE_READ:
 846                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 847                                 && state->n_rdonly != 0;
 848                         break;
 849                 case FMODE_WRITE:
 850                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 851                                 && state->n_wronly != 0;
 852                         break;
 853                 case FMODE_READ|FMODE_WRITE:
 854                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 855                                 && state->n_rdwr != 0;
 856         }
 857 out:
 858         return ret;
 859 }
 860
 861 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 862 {
 863         if (delegation == NULL)
 864                 return 0;
 865         if ((delegation->type & fmode) != fmode)
 866                 return 0;
 867         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 868                 return 0;
 869         nfs_mark_delegation_referenced(delegation);
 870         return 1;
 871 }
 872
 873 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 874 {
 875         switch (fmode) {
 876                 case FMODE_WRITE:
 877                         state->n_wronly++;
 878                         break;
 879                 case FMODE_READ:
 880                         state->n_rdonly++;
 881                         break;
 882                 case FMODE_READ|FMODE_WRITE:
 883                         state->n_rdwr++;
 884         }
 885         nfs4_state_set_mode_locked(state, state->state | fmode);
 886 }
 887
 888 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 889 {
 890         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 891                 nfs4_stateid_copy(&state->stateid, stateid);
 892         nfs4_stateid_copy(&state->open_stateid, stateid);
 893         switch (fmode) {
 894                 case FMODE_READ:
 895                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 896                         break;
 897                 case FMODE_WRITE:
 898                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 899                         break;
 900                 case FMODE_READ|FMODE_WRITE:
 901                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 902         }
 903 }
 904
 905 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 906 {
 907         write_seqlock(&state->seqlock);
 908         nfs_set_open_stateid_locked(state, stateid, fmode);
 909         write_sequnlock(&state->seqlock);
 910 }
 911
 912 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 913 {
 914         /*
 915          * Protect the call to nfs4_state_set_mode_locked and
 916          * serialise the stateid update
 917          */
 918         write_seqlock(&state->seqlock);
 919         if (deleg_stateid != NULL) {
 920                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 921                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 922         }
 923         if (open_stateid != NULL)
 924                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 925         write_sequnlock(&state->seqlock);
 926         spin_lock(&state->owner->so_lock);
 927         update_open_stateflags(state, fmode);
 928         spin_unlock(&state->owner->so_lock);
 929 }
 930
 931 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 932 {
 933         struct nfs_inode *nfsi = NFS_I(state->inode);
 934         struct nfs_delegation *deleg_cur;
 935         int ret = 0;
 936
 937         fmode &= (FMODE_READ|FMODE_WRITE);
 938
 939         rcu_read_lock();
 940         deleg_cur = rcu_dereference(nfsi->delegation);
 941         if (deleg_cur == NULL)
 942                 goto no_delegation;
 943
 944         spin_lock(&deleg_cur->lock);
 945         if (nfsi->delegation != deleg_cur ||
 946             (deleg_cur->type & fmode) != fmode)
 947                 goto no_delegation_unlock;
 948
 949         if (delegation == NULL)
 950                 delegation = &deleg_cur->stateid;
 951         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 952                 goto no_delegation_unlock;
 953
 954         nfs_mark_delegation_referenced(deleg_cur);
 955         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 956         ret = 1;
 957 no_delegation_unlock:
 958         spin_unlock(&deleg_cur->lock);
 959 no_delegation:
 960         rcu_read_unlock();
 961
 962         if (!ret && open_stateid != NULL) {
 963                 __update_open_stateid(state, open_stateid, NULL, fmode);
 964                 ret = 1;
 965         }
 966
 967         return ret;
 968 }
 969
 970
 971 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 972 {
 973         struct nfs_delegation *delegation;
 974
 975         rcu_read_lock();
 976         delegation = rcu_dereference(NFS_I(inode)->delegation);
 977         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 978                 rcu_read_unlock();
 979                 return;
 980         }
 981         rcu_read_unlock();
 982         nfs4_inode_return_delegation(inode);
 983 }
 984
 985 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 986 {
 987         struct nfs4_state *state = opendata->state;
 988         struct nfs_inode *nfsi = NFS_I(state->inode);
 989         struct nfs_delegation *delegation;
 990         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
 991         fmode_t fmode = opendata->o_arg.fmode;
 992         nfs4_stateid stateid;
 993         int ret = -EAGAIN;
 994
 995         for (;;) {
 996                 if (can_open_cached(state, fmode, open_mode)) {
 997                         spin_lock(&state->owner->so_lock);
 998                         if (can_open_cached(state, fmode, open_mode)) {
 999                                 update_open_stateflags(state, fmode);
1000                                 spin_unlock(&state->owner->so_lock);
1001                                 goto out_return_state;
1002                         }
1003                         spin_unlock(&state->owner->so_lock);
1004                 }
1005                 rcu_read_lock();
1006                 delegation = rcu_dereference(nfsi->delegation);
1007                 if (!can_open_delegated(delegation, fmode)) {
1008                         rcu_read_unlock();
1009                         break;
1010                 }
1011                 /* Save the delegation */
1012                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1013                 rcu_read_unlock();
1014                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1015                 if (ret != 0)
1016                         goto out;
1017                 ret = -EAGAIN;
1018
1019                 /* Try to update the stateid using the delegation */
1020                 if (update_open_stateid(state, NULL, &stateid, fmode))
1021                         goto out_return_state;
1022         }
1023 out:
1024         return ERR_PTR(ret);
1025 out_return_state:
1026         atomic_inc(&state->count);
1027         return state;
1028 }
1029
1030 static void
1031 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1032 {
1033         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1034         struct nfs_delegation *delegation;
1035         int delegation_flags = 0;
1036
1037         rcu_read_lock();
1038         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1039         if (delegation)
1040                 delegation_flags = delegation->flags;
1041         rcu_read_unlock();
1042         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1043                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1044                                    "returning a delegation for "
1045                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1046                                    clp->cl_hostname);
1047         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1048                 nfs_inode_set_delegation(state->inode,
1049                                          data->owner->so_cred,
1050                                          &data->o_res);
1051         else
1052                 nfs_inode_reclaim_delegation(state->inode,
1053                                              data->owner->so_cred,
1054                                              &data->o_res);
1055 }
1056
1057 /*
1058  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1059  * and update the nfs4_state.
1060  */
1061 static struct nfs4_state *
1062 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1063 {
1064         struct inode *inode = data->state->inode;
1065         struct nfs4_state *state = data->state;
1066         int ret;
1067
1068         if (!data->rpc_done) {
1069                 ret = data->rpc_status;
1070                 goto err;
1071         }
1072
1073         ret = -ESTALE;
1074         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1075             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1076             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1077                 goto err;
1078
1079         ret = -ENOMEM;
1080         state = nfs4_get_open_state(inode, data->owner);
1081         if (state == NULL)
1082                 goto err;
1083
1084         ret = nfs_refresh_inode(inode, &data->f_attr);
1085         if (ret)
1086                 goto err;
1087
1088         if (data->o_res.delegation_type != 0)
1089                 nfs4_opendata_check_deleg(data, state);
1090         update_open_stateid(state, &data->o_res.stateid, NULL,
1091                             data->o_arg.fmode);
1092
1093         return state;
1094 err:
1095         return ERR_PTR(ret);
1096
1097 }
1098
1099 static struct nfs4_state *
1100 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1101 {
1102         struct inode *inode;
1103         struct nfs4_state *state = NULL;
1104         int ret;
1105
1106         if (!data->rpc_done) {
1107                 state = nfs4_try_open_cached(data);
1108                 goto out;
1109         }
1110
1111         ret = -EAGAIN;
1112         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1113                 goto err;
1114         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1115         ret = PTR_ERR(inode);
1116         if (IS_ERR(inode))
1117                 goto err;
1118         ret = -ENOMEM;
1119         state = nfs4_get_open_state(inode, data->owner);
1120         if (state == NULL)
1121                 goto err_put_inode;
1122         if (data->o_res.delegation_type != 0)
1123                 nfs4_opendata_check_deleg(data, state);
1124         update_open_stateid(state, &data->o_res.stateid, NULL,
1125                         data->o_arg.fmode);
1126         iput(inode);
1127 out:
1128         return state;
1129 err_put_inode:
1130         iput(inode);
1131 err:
1132         return ERR_PTR(ret);
1133 }
1134
1135 static struct nfs4_state *
1136 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1137 {
1138         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1139                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1140         return _nfs4_opendata_to_nfs4_state(data);
1141 }
1142
1143 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1144 {
1145         struct nfs_inode *nfsi = NFS_I(state->inode);
1146         struct nfs_open_context *ctx;
1147
1148         spin_lock(&state->inode->i_lock);
1149         list_for_each_entry(ctx, &nfsi->open_files, list) {
1150                 if (ctx->state != state)
1151                         continue;
1152                 get_nfs_open_context(ctx);
1153                 spin_unlock(&state->inode->i_lock);
1154                 return ctx;
1155         }
1156         spin_unlock(&state->inode->i_lock);
1157         return ERR_PTR(-ENOENT);
1158 }
1159
1160 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1161 {
1162         struct nfs4_opendata *opendata;
1163
1164         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1165         if (opendata == NULL)
1166                 return ERR_PTR(-ENOMEM);
1167         opendata->state = state;
1168         atomic_inc(&state->count);
1169         return opendata;
1170 }
1171
1172 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1173 {
1174         struct nfs4_state *newstate;
1175         int ret;
1176
1177         opendata->o_arg.open_flags = 0;
1178         opendata->o_arg.fmode = fmode;
1179         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1180         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1181         nfs4_init_opendata_res(opendata);
1182         ret = _nfs4_recover_proc_open(opendata);
1183         if (ret != 0)
1184                 return ret;
1185         newstate = nfs4_opendata_to_nfs4_state(opendata);
1186         if (IS_ERR(newstate))
1187                 return PTR_ERR(newstate);
1188         nfs4_close_state(newstate, fmode);
1189         *res = newstate;
1190         return 0;
1191 }
1192
1193 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1194 {
1195         struct nfs4_state *newstate;
1196         int ret;
1197
1198         /* memory barrier prior to reading state->n_* */
1199         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1200         smp_rmb();
1201         if (state->n_rdwr != 0) {
1202                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1203                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1204                 if (ret != 0)
1205                         return ret;
1206                 if (newstate != state)
1207                         return -ESTALE;
1208         }
1209         if (state->n_wronly != 0) {
1210                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1211                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1212                 if (ret != 0)
1213                         return ret;
1214                 if (newstate != state)
1215                         return -ESTALE;
1216         }
1217         if (state->n_rdonly != 0) {
1218                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1219                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1220                 if (ret != 0)
1221                         return ret;
1222                 if (newstate != state)
1223                         return -ESTALE;
1224         }
1225         /*
1226          * We may have performed cached opens for all three recoveries.
1227          * Check if we need to update the current stateid.
1228          */
1229         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1230             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1231                 write_seqlock(&state->seqlock);
1232                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1233                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1234                 write_sequnlock(&state->seqlock);
1235         }
1236         return 0;
1237 }
1238
1239 /*
1240  * OPEN_RECLAIM:
1241  *      reclaim state on the server after a reboot.
1242  */
1243 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1244 {
1245         struct nfs_delegation *delegation;
1246         struct nfs4_opendata *opendata;
1247         fmode_t delegation_type = 0;
1248         int status;
1249
1250         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1251         if (IS_ERR(opendata))
1252                 return PTR_ERR(opendata);
1253         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1254         opendata->o_arg.fh = NFS_FH(state->inode);
1255         rcu_read_lock();
1256         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1257         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1258                 delegation_type = delegation->type;
1259         rcu_read_unlock();
1260         opendata->o_arg.u.delegation_type = delegation_type;
1261         status = nfs4_open_recover(opendata, state);
1262         nfs4_opendata_put(opendata);
1263         return status;
1264 }
1265
1266 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1267 {
1268         struct nfs_server *server = NFS_SERVER(state->inode);
1269         struct nfs4_exception exception = { };
1270         int err;
1271         do {
1272                 err = _nfs4_do_open_reclaim(ctx, state);
1273                 if (err != -NFS4ERR_DELAY)
1274                         break;
1275                 nfs4_handle_exception(server, err, &exception);
1276         } while (exception.retry);
1277         return err;
1278 }
1279
1280 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1281 {
1282         struct nfs_open_context *ctx;
1283         int ret;
1284
1285         ctx = nfs4_state_find_open_context(state);
1286         if (IS_ERR(ctx))
1287                 return PTR_ERR(ctx);
1288         ret = nfs4_do_open_reclaim(ctx, state);
1289         put_nfs_open_context(ctx);
1290         return ret;
1291 }
1292
1293 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1294 {
1295         struct nfs4_opendata *opendata;
1296         int ret;
1297
1298         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1299         if (IS_ERR(opendata))
1300                 return PTR_ERR(opendata);
1301         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1302         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1303         ret = nfs4_open_recover(opendata, state);
1304         nfs4_opendata_put(opendata);
1305         return ret;
1306 }
1307
1308 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1309 {
1310         struct nfs4_exception exception = { };
1311         struct nfs_server *server = NFS_SERVER(state->inode);
1312         int err;
1313         do {
1314                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1315                 switch (err) {
1316                         case 0:
1317                         case -ENOENT:
1318                         case -ESTALE:
1319                                 goto out;
1320                         case -NFS4ERR_BADSESSION:
1321                         case -NFS4ERR_BADSLOT:
1322                         case -NFS4ERR_BAD_HIGH_SLOT:
1323                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1324                         case -NFS4ERR_DEADSESSION:
1325                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1326                                 goto out;
1327                         case -NFS4ERR_STALE_CLIENTID:
1328                         case -NFS4ERR_STALE_STATEID:
1329                         case -NFS4ERR_EXPIRED:
1330                                 /* Don't recall a delegation if it was lost */
1331                                 nfs4_schedule_lease_recovery(server->nfs_client);
1332                                 goto out;
1333                         case -ERESTARTSYS:
1334                                 /*
1335                                  * The show must go on: exit, but mark the
1336                                  * stateid as needing recovery.
1337                                  */
1338                         case -NFS4ERR_DELEG_REVOKED:
1339                         case -NFS4ERR_ADMIN_REVOKED:
1340                         case -NFS4ERR_BAD_STATEID:
1341                                 nfs_inode_find_state_and_recover(state->inode,
1342                                                 stateid);
1343                                 nfs4_schedule_stateid_recovery(server, state);
1344                         case -EKEYEXPIRED:
1345                                 /*
1346                                  * User RPCSEC_GSS context has expired.
1347                                  * We cannot recover this stateid now, so
1348                                  * skip it and allow recovery thread to
1349                                  * proceed.
1350                                  */
1351                         case -ENOMEM:
1352                                 err = 0;
1353                                 goto out;
1354                 }
1355                 err = nfs4_handle_exception(server, err, &exception);
1356         } while (exception.retry);
1357 out:
1358         return err;
1359 }
1360
1361 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1362 {
1363         struct nfs4_opendata *data = calldata;
1364
1365         data->rpc_status = task->tk_status;
1366         if (data->rpc_status == 0) {
1367                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1368                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1369                 renew_lease(data->o_res.server, data->timestamp);
1370                 data->rpc_done = 1;
1371         }
1372 }
1373
1374 static void nfs4_open_confirm_release(void *calldata)
1375 {
1376         struct nfs4_opendata *data = calldata;
1377         struct nfs4_state *state = NULL;
1378
1379         /* If this request hasn't been cancelled, do nothing */
1380         if (data->cancelled == 0)
1381                 goto out_free;
1382         /* In case of error, no cleanup! */
1383         if (!data->rpc_done)
1384                 goto out_free;
1385         state = nfs4_opendata_to_nfs4_state(data);
1386         if (!IS_ERR(state))
1387                 nfs4_close_state(state, data->o_arg.fmode);
1388 out_free:
1389         nfs4_opendata_put(data);
1390 }
1391
1392 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1393         .rpc_call_done = nfs4_open_confirm_done,
1394         .rpc_release = nfs4_open_confirm_release,
1395 };
1396
1397 /*
1398  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1399  */
1400 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1401 {
1402         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1403         struct rpc_task *task;
1404         struct  rpc_message msg = {
1405                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1406                 .rpc_argp = &data->c_arg,
1407                 .rpc_resp = &data->c_res,
1408                 .rpc_cred = data->owner->so_cred,
1409         };
1410         struct rpc_task_setup task_setup_data = {
1411                 .rpc_client = server->client,
1412                 .rpc_message = &msg,
1413                 .callback_ops = &nfs4_open_confirm_ops,
1414                 .callback_data = data,
1415                 .workqueue = nfsiod_workqueue,
1416                 .flags = RPC_TASK_ASYNC,
1417         };
1418         int status;
1419
1420         kref_get(&data->kref);
1421         data->rpc_done = 0;
1422         data->rpc_status = 0;
1423         data->timestamp = jiffies;
1424         task = rpc_run_task(&task_setup_data);
1425         if (IS_ERR(task))
1426                 return PTR_ERR(task);
1427         status = nfs4_wait_for_completion_rpc_task(task);
1428         if (status != 0) {
1429                 data->cancelled = 1;
1430                 smp_wmb();
1431         } else
1432                 status = data->rpc_status;
1433         rpc_put_task(task);
1434         return status;
1435 }
1436
1437 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1438 {
1439         struct nfs4_opendata *data = calldata;
1440         struct nfs4_state_owner *sp = data->owner;
1441
1442         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1443                 return;
1444         /*
1445          * Check if we still need to send an OPEN call, or if we can use
1446          * a delegation instead.
1447          */
1448         if (data->state != NULL) {
1449                 struct nfs_delegation *delegation;
1450
1451                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1452                         goto out_no_action;
1453                 rcu_read_lock();
1454                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1455                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1456                     can_open_delegated(delegation, data->o_arg.fmode))
1457                         goto unlock_no_action;
1458                 rcu_read_unlock();
1459         }
1460         /* Update client id. */
1461         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1462         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1463                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1464                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1465                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1466         }
1467         data->timestamp = jiffies;
1468         if (nfs4_setup_sequence(data->o_arg.server,
1469                                 &data->o_arg.seq_args,
1470                                 &data->o_res.seq_res,
1471                                 task) != 0)
1472                 nfs_release_seqid(data->o_arg.seqid);
1473         return;
1474 unlock_no_action:
1475         rcu_read_unlock();
1476 out_no_action:
1477         task->tk_action = NULL;
1478
1479 }
1480
1481 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1482 {
1483         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1484         nfs4_open_prepare(task, calldata);
1485 }
1486
1487 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1488 {
1489         struct nfs4_opendata *data = calldata;
1490
1491         data->rpc_status = task->tk_status;
1492
1493         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1494                 return;
1495
1496         if (task->tk_status == 0) {
1497                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1498                         switch (data->o_res.f_attr->mode & S_IFMT) {
1499                         case S_IFREG:
1500                                 break;
1501                         case S_IFLNK:
1502                                 data->rpc_status = -ELOOP;
1503                                 break;
1504                         case S_IFDIR:
1505                                 data->rpc_status = -EISDIR;
1506                                 break;
1507                         default:
1508                                 data->rpc_status = -ENOTDIR;
1509                         }
1510                 }
1511                 renew_lease(data->o_res.server, data->timestamp);
1512                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1513                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1514         }
1515         data->rpc_done = 1;
1516 }
1517
1518 static void nfs4_open_release(void *calldata)
1519 {
1520         struct nfs4_opendata *data = calldata;
1521         struct nfs4_state *state = NULL;
1522
1523         /* If this request hasn't been cancelled, do nothing */
1524         if (data->cancelled == 0)
1525                 goto out_free;
1526         /* In case of error, no cleanup! */
1527         if (data->rpc_status != 0 || !data->rpc_done)
1528                 goto out_free;
1529         /* In case we need an open_confirm, no cleanup! */
1530         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1531                 goto out_free;
1532         state = nfs4_opendata_to_nfs4_state(data);
1533         if (!IS_ERR(state))
1534                 nfs4_close_state(state, data->o_arg.fmode);
1535 out_free:
1536         nfs4_opendata_put(data);
1537 }
1538
1539 static const struct rpc_call_ops nfs4_open_ops = {
1540         .rpc_call_prepare = nfs4_open_prepare,
1541         .rpc_call_done = nfs4_open_done,
1542         .rpc_release = nfs4_open_release,
1543 };
1544
1545 static const struct rpc_call_ops nfs4_recover_open_ops = {
1546         .rpc_call_prepare = nfs4_recover_open_prepare,
1547         .rpc_call_done = nfs4_open_done,
1548         .rpc_release = nfs4_open_release,
1549 };
1550
1551 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1552 {
1553         struct inode *dir = data->dir->d_inode;
1554         struct nfs_server *server = NFS_SERVER(dir);
1555         struct nfs_openargs *o_arg = &data->o_arg;
1556         struct nfs_openres *o_res = &data->o_res;
1557         struct rpc_task *task;
1558         struct rpc_message msg = {
1559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1560                 .rpc_argp = o_arg,
1561                 .rpc_resp = o_res,
1562                 .rpc_cred = data->owner->so_cred,
1563         };
1564         struct rpc_task_setup task_setup_data = {
1565                 .rpc_client = server->client,
1566                 .rpc_message = &msg,
1567                 .callback_ops = &nfs4_open_ops,
1568                 .callback_data = data,
1569                 .workqueue = nfsiod_workqueue,
1570                 .flags = RPC_TASK_ASYNC,
1571         };
1572         int status;
1573
1574         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1575         kref_get(&data->kref);
1576         data->rpc_done = 0;
1577         data->rpc_status = 0;
1578         data->cancelled = 0;
1579         if (isrecover)
1580                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1581         task = rpc_run_task(&task_setup_data);
1582         if (IS_ERR(task))
1583                 return PTR_ERR(task);
1584         status = nfs4_wait_for_completion_rpc_task(task);
1585         if (status != 0) {
1586                 data->cancelled = 1;
1587                 smp_wmb();
1588         } else
1589                 status = data->rpc_status;
1590         rpc_put_task(task);
1591
1592         return status;
1593 }
1594
1595 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1596 {
1597         struct inode *dir = data->dir->d_inode;
1598         struct nfs_openres *o_res = &data->o_res;
1599         int status;
1600
1601         status = nfs4_run_open_task(data, 1);
1602         if (status != 0 || !data->rpc_done)
1603                 return status;
1604
1605         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1606
1607         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1608                 status = _nfs4_proc_open_confirm(data);
1609                 if (status != 0)
1610                         return status;
1611         }
1612
1613         return status;
1614 }
1615
1616 static int nfs4_opendata_access(struct rpc_cred *cred,
1617                                 struct nfs4_opendata *opendata,
1618                                 struct nfs4_state *state, fmode_t fmode)
1619 {
1620         struct nfs_access_entry cache;
1621         u32 mask;
1622
1623         /* access call failed or for some reason the server doesn't
1624          * support any access modes -- defer access call until later */
1625         if (opendata->o_res.access_supported == 0)
1626                 return 0;
1627
1628         mask = 0;
1629         /* don't check MAY_WRITE - a newly created file may not have
1630          * write mode bits, but POSIX allows the creating process to write */
1631         if (fmode & FMODE_READ)
1632                 mask |= MAY_READ;
1633         if (fmode & FMODE_EXEC)
1634                 mask |= MAY_EXEC;
1635
1636         cache.cred = cred;
1637         cache.jiffies = jiffies;
1638         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1639         nfs_access_add_cache(state->inode, &cache);
1640
1641         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1642                 return 0;
1643
1644         /* even though OPEN succeeded, access is denied. Close the file */
1645         nfs4_close_state(state, fmode);
1646         return -EACCES;
1647 }
1648
1649 /*
1650  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1651  */
1652 static int _nfs4_proc_open(struct nfs4_opendata *data)
1653 {
1654         struct inode *dir = data->dir->d_inode;
1655         struct nfs_server *server = NFS_SERVER(dir);
1656         struct nfs_openargs *o_arg = &data->o_arg;
1657         struct nfs_openres *o_res = &data->o_res;
1658         int status;
1659
1660         status = nfs4_run_open_task(data, 0);
1661         if (!data->rpc_done)
1662                 return status;
1663         if (status != 0) {
1664                 if (status == -NFS4ERR_BADNAME &&
1665                                 !(o_arg->open_flags & O_CREAT))
1666                         return -ENOENT;
1667                 return status;
1668         }
1669
1670         nfs_fattr_map_and_free_names(server, &data->f_attr);
1671
1672         if (o_arg->open_flags & O_CREAT)
1673                 update_changeattr(dir, &o_res->cinfo);
1674         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1675                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1676         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1677                 status = _nfs4_proc_open_confirm(data);
1678                 if (status != 0)
1679                         return status;
1680         }
1681         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1682                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1683         return 0;
1684 }
1685
1686 static int nfs4_recover_expired_lease(struct nfs_server *server)
1687 {
1688         return nfs4_client_recover_expired_lease(server->nfs_client);
1689 }
1690
1691 /*
1692  * OPEN_EXPIRED:
1693  *      reclaim state on the server after a network partition.
1694  *      Assumes caller holds the appropriate lock
1695  */
1696 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1697 {
1698         struct nfs4_opendata *opendata;
1699         int ret;
1700
1701         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1702         if (IS_ERR(opendata))
1703                 return PTR_ERR(opendata);
1704         ret = nfs4_open_recover(opendata, state);
1705         if (ret == -ESTALE)
1706                 d_drop(ctx->dentry);
1707         nfs4_opendata_put(opendata);
1708         return ret;
1709 }
1710
1711 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1712 {
1713         struct nfs_server *server = NFS_SERVER(state->inode);
1714         struct nfs4_exception exception = { };
1715         int err;
1716
1717         do {
1718                 err = _nfs4_open_expired(ctx, state);
1719                 switch (err) {
1720                 default:
1721                         goto out;
1722                 case -NFS4ERR_GRACE:
1723                 case -NFS4ERR_DELAY:
1724                         nfs4_handle_exception(server, err, &exception);
1725                         err = 0;
1726                 }
1727         } while (exception.retry);
1728 out:
1729         return err;
1730 }
1731
1732 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1733 {
1734         struct nfs_open_context *ctx;
1735         int ret;
1736
1737         ctx = nfs4_state_find_open_context(state);
1738         if (IS_ERR(ctx))
1739                 return PTR_ERR(ctx);
1740         ret = nfs4_do_open_expired(ctx, state);
1741         put_nfs_open_context(ctx);
1742         return ret;
1743 }
1744
1745 #if defined(CONFIG_NFS_V4_1)
1746 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1747 {
1748         struct nfs_server *server = NFS_SERVER(state->inode);
1749         nfs4_stateid *stateid = &state->stateid;
1750         int status;
1751
1752         /* If a state reset has been done, test_stateid is unneeded */
1753         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1754                 return;
1755
1756         status = nfs41_test_stateid(server, stateid);
1757         if (status != NFS_OK) {
1758                 /* Free the stateid unless the server explicitly
1759                  * informs us the stateid is unrecognized. */
1760                 if (status != -NFS4ERR_BAD_STATEID)
1761                         nfs41_free_stateid(server, stateid);
1762                 nfs_remove_bad_delegation(state->inode);
1763
1764                 write_seqlock(&state->seqlock);
1765                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1766                 write_sequnlock(&state->seqlock);
1767                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1768         }
1769 }
1770
1771 /**
1772  * nfs41_check_open_stateid - possibly free an open stateid
1773  *
1774  * @state: NFSv4 state for an inode
1775  *
1776  * Returns NFS_OK if recovery for this stateid is now finished.
1777  * Otherwise a negative NFS4ERR value is returned.
1778  */
1779 static int nfs41_check_open_stateid(struct nfs4_state *state)
1780 {
1781         struct nfs_server *server = NFS_SERVER(state->inode);
1782         nfs4_stateid *stateid = &state->open_stateid;
1783         int status;
1784
1785         /* If a state reset has been done, test_stateid is unneeded */
1786         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1787             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1788             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1789                 return -NFS4ERR_BAD_STATEID;
1790
1791         status = nfs41_test_stateid(server, stateid);
1792         if (status != NFS_OK) {
1793                 /* Free the stateid unless the server explicitly
1794                  * informs us the stateid is unrecognized. */
1795                 if (status != -NFS4ERR_BAD_STATEID)
1796                         nfs41_free_stateid(server, stateid);
1797
1798                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1799                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1800                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1801         }
1802         return status;
1803 }
1804
1805 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1806 {
1807         int status;
1808
1809         nfs41_clear_delegation_stateid(state);
1810         status = nfs41_check_open_stateid(state);
1811         if (status != NFS_OK)
1812                 status = nfs4_open_expired(sp, state);
1813         return status;
1814 }
1815 #endif
1816
1817 /*
1818  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1819  * fields corresponding to attributes that were used to store the verifier.
1820  * Make sure we clobber those fields in the later setattr call
1821  */
1822 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1823 {
1824         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1825             !(sattr->ia_valid & ATTR_ATIME_SET))
1826                 sattr->ia_valid |= ATTR_ATIME;
1827
1828         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1829             !(sattr->ia_valid & ATTR_MTIME_SET))
1830                 sattr->ia_valid |= ATTR_MTIME;
1831 }
1832
1833 /*
1834  * Returns a referenced nfs4_state
1835  */
1836 static int _nfs4_do_open(struct inode *dir,
1837                         struct dentry *dentry,
1838                         fmode_t fmode,
1839                         int flags,
1840                         struct iattr *sattr,
1841                         struct rpc_cred *cred,
1842                         struct nfs4_state **res,
1843                         struct nfs4_threshold **ctx_th)
1844 {
1845         struct nfs4_state_owner  *sp;
1846         struct nfs4_state     *state = NULL;
1847         struct nfs_server       *server = NFS_SERVER(dir);
1848         struct nfs4_opendata *opendata;
1849         int status;
1850
1851         /* Protect against reboot recovery conflicts */
1852         status = -ENOMEM;
1853         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1854         if (sp == NULL) {
1855                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1856                 goto out_err;
1857         }
1858         status = nfs4_recover_expired_lease(server);
1859         if (status != 0)
1860                 goto err_put_state_owner;
1861         if (dentry->d_inode != NULL)
1862                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1863         status = -ENOMEM;
1864         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1865         if (opendata == NULL)
1866                 goto err_put_state_owner;
1867
1868         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1869                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1870                 if (!opendata->f_attr.mdsthreshold)
1871                         goto err_opendata_put;
1872                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1873         }
1874         if (dentry->d_inode != NULL)
1875                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1876
1877         status = _nfs4_proc_open(opendata);
1878         if (status != 0)
1879                 goto err_opendata_put;
1880
1881         state = nfs4_opendata_to_nfs4_state(opendata);
1882         status = PTR_ERR(state);
1883         if (IS_ERR(state))
1884                 goto err_opendata_put;
1885         if (server->caps & NFS_CAP_POSIX_LOCK)
1886                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1887
1888         status = nfs4_opendata_access(cred, opendata, state, fmode);
1889         if (status != 0)
1890                 goto err_opendata_put;
1891
1892         if (opendata->o_arg.open_flags & O_EXCL) {
1893                 nfs4_exclusive_attrset(opendata, sattr);
1894
1895                 nfs_fattr_init(opendata->o_res.f_attr);
1896                 status = nfs4_do_setattr(state->inode, cred,
1897                                 opendata->o_res.f_attr, sattr,
1898                                 state);
1899                 if (status == 0)
1900                         nfs_setattr_update_inode(state->inode, sattr);
1901                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1902         }
1903
1904         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1905                 *ctx_th = opendata->f_attr.mdsthreshold;
1906         else
1907                 kfree(opendata->f_attr.mdsthreshold);
1908         opendata->f_attr.mdsthreshold = NULL;
1909
1910         nfs4_opendata_put(opendata);
1911         nfs4_put_state_owner(sp);
1912         *res = state;
1913         return 0;
1914 err_opendata_put:
1915         kfree(opendata->f_attr.mdsthreshold);
1916         nfs4_opendata_put(opendata);
1917 err_put_state_owner:
1918         nfs4_put_state_owner(sp);
1919 out_err:
1920         *res = NULL;
1921         return status;
1922 }
1923
1924
1925 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1926                                         struct dentry *dentry,
1927                                         fmode_t fmode,
1928                                         int flags,
1929                                         struct iattr *sattr,
1930                                         struct rpc_cred *cred,
1931                                         struct nfs4_threshold **ctx_th)
1932 {
1933         struct nfs4_exception exception = { };
1934         struct nfs4_state *res;
1935         int status;
1936
1937         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1938         do {
1939                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1940                                        &res, ctx_th);
1941                 if (status == 0)
1942                         break;
1943                 /* NOTE: BAD_SEQID means the server and client disagree about the
1944                  * book-keeping w.r.t. state-changing operations
1945                  * (OPEN/CLOSE/LOCK/LOCKU...)
1946                  * It is actually a sign of a bug on the client or on the server.
1947                  *
1948                  * If we receive a BAD_SEQID error in the particular case of
1949                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1950                  * have unhashed the old state_owner for us, and that we can
1951                  * therefore safely retry using a new one. We should still warn
1952                  * the user though...
1953                  */
1954                 if (status == -NFS4ERR_BAD_SEQID) {
1955                         pr_warn_ratelimited("NFS: v4 server %s "
1956                                         " returned a bad sequence-id error!\n",
1957                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1958                         exception.retry = 1;
1959                         continue;
1960                 }
1961                 /*
1962                  * BAD_STATEID on OPEN means that the server cancelled our
1963                  * state before it received the OPEN_CONFIRM.
1964                  * Recover by retrying the request as per the discussion
1965                  * on Page 181 of RFC3530.
1966                  */
1967                 if (status == -NFS4ERR_BAD_STATEID) {
1968                         exception.retry = 1;
1969                         continue;
1970                 }
1971                 if (status == -EAGAIN) {
1972                         /* We must have found a delegation */
1973                         exception.retry = 1;
1974                         continue;
1975                 }
1976                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1977                                         status, &exception));
1978         } while (exception.retry);
1979         return res;
1980 }
1981
1982 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1983                             struct nfs_fattr *fattr, struct iattr *sattr,
1984                             struct nfs4_state *state)
1985 {
1986         struct nfs_server *server = NFS_SERVER(inode);
1987         struct nfs_setattrargs  arg = {
1988                 .fh             = NFS_FH(inode),
1989                 .iap            = sattr,
1990                 .server         = server,
1991                 .bitmask = server->attr_bitmask,
1992         };
1993         struct nfs_setattrres  res = {
1994                 .fattr          = fattr,
1995                 .server         = server,
1996         };
1997         struct rpc_message msg = {
1998                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1999                 .rpc_argp       = &arg,
2000                 .rpc_resp       = &res,
2001                 .rpc_cred       = cred,
2002         };
2003         unsigned long timestamp = jiffies;
2004         int status;
2005
2006         nfs_fattr_init(fattr);
2007
2008         if (state != NULL) {
2009                 struct nfs_lockowner lockowner = {
2010                         .l_owner = current->files,
2011                         .l_pid = current->tgid,
2012                 };
2013                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2014                                 &lockowner);
2015         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2016                                 FMODE_WRITE)) {
2017                 /* Use that stateid */
2018         } else
2019                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2020
2021         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2022         if (status == 0 && state != NULL)
2023                 renew_lease(server, timestamp);
2024         return status;
2025 }
2026
2027 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2028                            struct nfs_fattr *fattr, struct iattr *sattr,
2029                            struct nfs4_state *state)
2030 {
2031         struct nfs_server *server = NFS_SERVER(inode);
2032         struct nfs4_exception exception = {
2033                 .state = state,
2034                 .inode = inode,
2035         };
2036         int err;
2037         do {
2038                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2039                 switch (err) {
2040                 case -NFS4ERR_OPENMODE:
2041                         if (state && !(state->state & FMODE_WRITE)) {
2042                                 err = -EBADF;
2043                                 if (sattr->ia_valid & ATTR_OPEN)
2044                                         err = -EACCES;
2045                                 goto out;
2046                         }
2047                 }
2048                 err = nfs4_handle_exception(server, err, &exception);
2049         } while (exception.retry);
2050 out:
2051         return err;
2052 }
2053
2054 struct nfs4_closedata {
2055         struct inode *inode;
2056         struct nfs4_state *state;
2057         struct nfs_closeargs arg;
2058         struct nfs_closeres res;
2059         struct nfs_fattr fattr;
2060         unsigned long timestamp;
2061         bool roc;
2062         u32 roc_barrier;
2063 };
2064
2065 static void nfs4_free_closedata(void *data)
2066 {
2067         struct nfs4_closedata *calldata = data;
2068         struct nfs4_state_owner *sp = calldata->state->owner;
2069         struct super_block *sb = calldata->state->inode->i_sb;
2070
2071         if (calldata->roc)
2072                 pnfs_roc_release(calldata->state->inode);
2073         nfs4_put_open_state(calldata->state);
2074         nfs_free_seqid(calldata->arg.seqid);
2075         nfs4_put_state_owner(sp);
2076         nfs_sb_deactive_async(sb);
2077         kfree(calldata);
2078 }
2079
2080 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2081                 fmode_t fmode)
2082 {
2083         spin_lock(&state->owner->so_lock);
2084         if (!(fmode & FMODE_READ))
2085                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2086         if (!(fmode & FMODE_WRITE))
2087                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2088         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2089         spin_unlock(&state->owner->so_lock);
2090 }
2091
2092 static void nfs4_close_done(struct rpc_task *task, void *data)
2093 {
2094         struct nfs4_closedata *calldata = data;
2095         struct nfs4_state *state = calldata->state;
2096         struct nfs_server *server = NFS_SERVER(calldata->inode);
2097
2098         dprintk("%s: begin!\n", __func__);
2099         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2100                 return;
2101         /* hmm. we are done with the inode, and in the process of freeing
2102          * the state_owner. we keep this around to process errors
2103          */
2104         switch (task->tk_status) {
2105                 case 0:
2106                         if (calldata->roc)
2107                                 pnfs_roc_set_barrier(state->inode,
2108                                                      calldata->roc_barrier);
2109                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2110                         renew_lease(server, calldata->timestamp);
2111                         nfs4_close_clear_stateid_flags(state,
2112                                         calldata->arg.fmode);
2113                         break;
2114                 case -NFS4ERR_STALE_STATEID:
2115                 case -NFS4ERR_OLD_STATEID:
2116                 case -NFS4ERR_BAD_STATEID:
2117                 case -NFS4ERR_EXPIRED:
2118                         if (calldata->arg.fmode == 0)
2119                                 break;
2120                 default:
2121                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2122                                 rpc_restart_call_prepare(task);
2123         }
2124         nfs_release_seqid(calldata->arg.seqid);
2125         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2126         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2127 }
2128
2129 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2130 {
2131         struct nfs4_closedata *calldata = data;
2132         struct nfs4_state *state = calldata->state;
2133         struct inode *inode = calldata->inode;
2134         int call_close = 0;
2135
2136         dprintk("%s: begin!\n", __func__);
2137         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2138                 return;
2139
2140         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2141         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2142         spin_lock(&state->owner->so_lock);
2143         /* Calculate the change in open mode */
2144         if (state->n_rdwr == 0) {
2145                 if (state->n_rdonly == 0) {
2146                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2147                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2148                         calldata->arg.fmode &= ~FMODE_READ;
2149                 }
2150                 if (state->n_wronly == 0) {
2151                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2152                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2153                         calldata->arg.fmode &= ~FMODE_WRITE;
2154                 }
2155         }
2156         spin_unlock(&state->owner->so_lock);
2157
2158         if (!call_close) {
2159                 /* Note: exit _without_ calling nfs4_close_done */
2160                 task->tk_action = NULL;
2161                 goto out;
2162         }
2163
2164         if (calldata->arg.fmode == 0) {
2165                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2166                 if (calldata->roc &&
2167                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2168                         goto out;
2169         }
2170
2171         nfs_fattr_init(calldata->res.fattr);
2172         calldata->timestamp = jiffies;
2173         if (nfs4_setup_sequence(NFS_SERVER(inode),
2174                                 &calldata->arg.seq_args,
2175                                 &calldata->res.seq_res,
2176                                 task) != 0)
2177                 nfs_release_seqid(calldata->arg.seqid);
2178 out:
2179         dprintk("%s: done!\n", __func__);
2180 }
2181
2182 static const struct rpc_call_ops nfs4_close_ops = {
2183         .rpc_call_prepare = nfs4_close_prepare,
2184         .rpc_call_done = nfs4_close_done,
2185         .rpc_release = nfs4_free_closedata,
2186 };
2187
2188 /*
2189  * It is possible for data to be read/written from a mem-mapped file
2190  * after the sys_close call (which hits the vfs layer as a flush).
2191  * This means that we can't safely call nfsv4 close on a file until
2192  * the inode is cleared. This in turn means that we are not good
2193  * NFSv4 citizens - we do not indicate to the server to update the file's
2194  * share state even when we are done with one of the three share
2195  * stateid's in the inode.
2196  *
2197  * NOTE: Caller must be holding the sp->so_owner semaphore!
2198  */
2199 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2200 {
2201         struct nfs_server *server = NFS_SERVER(state->inode);
2202         struct nfs4_closedata *calldata;
2203         struct nfs4_state_owner *sp = state->owner;
2204         struct rpc_task *task;
2205         struct rpc_message msg = {
2206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2207                 .rpc_cred = state->owner->so_cred,
2208         };
2209         struct rpc_task_setup task_setup_data = {
2210                 .rpc_client = server->client,
2211                 .rpc_message = &msg,
2212                 .callback_ops = &nfs4_close_ops,
2213                 .workqueue = nfsiod_workqueue,
2214                 .flags = RPC_TASK_ASYNC,
2215         };
2216         int status = -ENOMEM;
2217
2218         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2219         if (calldata == NULL)
2220                 goto out;
2221         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2222         calldata->inode = state->inode;
2223         calldata->state = state;
2224         calldata->arg.fh = NFS_FH(state->inode);
2225         calldata->arg.stateid = &state->open_stateid;
2226         /* Serialization for the sequence id */
2227         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2228         if (calldata->arg.seqid == NULL)
2229                 goto out_free_calldata;
2230         calldata->arg.fmode = 0;
2231         calldata->arg.bitmask = server->cache_consistency_bitmask;
2232         calldata->res.fattr = &calldata->fattr;
2233         calldata->res.seqid = calldata->arg.seqid;
2234         calldata->res.server = server;
2235         calldata->roc = pnfs_roc(state->inode);
2236         nfs_sb_active(calldata->inode->i_sb);
2237
2238         msg.rpc_argp = &calldata->arg;
2239         msg.rpc_resp = &calldata->res;
2240         task_setup_data.callback_data = calldata;
2241         task = rpc_run_task(&task_setup_data);
2242         if (IS_ERR(task))
2243                 return PTR_ERR(task);
2244         status = 0;
2245         if (wait)
2246                 status = rpc_wait_for_completion_task(task);
2247         rpc_put_task(task);
2248         return status;
2249 out_free_calldata:
2250         kfree(calldata);
2251 out:
2252         nfs4_put_open_state(state);
2253         nfs4_put_state_owner(sp);
2254         return status;
2255 }
2256
2257 static struct inode *
2258 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2259 {
2260         struct nfs4_state *state;
2261
2262         /* Protect against concurrent sillydeletes */
2263         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2264                              ctx->cred, &ctx->mdsthreshold);
2265         if (IS_ERR(state))
2266                 return ERR_CAST(state);
2267         ctx->state = state;
2268         return igrab(state->inode);
2269 }
2270
2271 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2272 {
2273         if (ctx->state == NULL)
2274                 return;
2275         if (is_sync)
2276                 nfs4_close_sync(ctx->state, ctx->mode);
2277         else
2278                 nfs4_close_state(ctx->state, ctx->mode);
2279 }
2280
2281 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2282 {
2283         struct nfs4_server_caps_arg args = {
2284                 .fhandle = fhandle,
2285         };
2286         struct nfs4_server_caps_res res = {};
2287         struct rpc_message msg = {
2288                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2289                 .rpc_argp = &args,
2290                 .rpc_resp = &res,
2291         };
2292         int status;
2293
2294         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2295         if (status == 0) {
2296                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2297                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2298                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2299                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2300                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2301                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2302                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2303                         server->caps |= NFS_CAP_ACLS;
2304                 if (res.has_links != 0)
2305                         server->caps |= NFS_CAP_HARDLINKS;
2306                 if (res.has_symlinks != 0)
2307                         server->caps |= NFS_CAP_SYMLINKS;
2308                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2309                         server->caps |= NFS_CAP_FILEID;
2310                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2311                         server->caps |= NFS_CAP_MODE;
2312                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2313                         server->caps |= NFS_CAP_NLINK;
2314                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2315                         server->caps |= NFS_CAP_OWNER;
2316                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2317                         server->caps |= NFS_CAP_OWNER_GROUP;
2318                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2319                         server->caps |= NFS_CAP_ATIME;
2320                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2321                         server->caps |= NFS_CAP_CTIME;
2322                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2323                         server->caps |= NFS_CAP_MTIME;
2324
2325                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2326                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2327                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2328                 server->acl_bitmask = res.acl_bitmask;
2329                 server->fh_expire_type = res.fh_expire_type;
2330         }
2331
2332         return status;
2333 }
2334
2335 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2336 {
2337         struct nfs4_exception exception = { };
2338         int err;
2339         do {
2340                 err = nfs4_handle_exception(server,
2341                                 _nfs4_server_capabilities(server, fhandle),
2342                                 &exception);
2343         } while (exception.retry);
2344         return err;
2345 }
2346
2347 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2348                 struct nfs_fsinfo *info)
2349 {
2350         struct nfs4_lookup_root_arg args = {
2351                 .bitmask = nfs4_fattr_bitmap,
2352         };
2353         struct nfs4_lookup_res res = {
2354                 .server = server,
2355                 .fattr = info->fattr,
2356                 .fh = fhandle,
2357         };
2358         struct rpc_message msg = {
2359                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2360                 .rpc_argp = &args,
2361                 .rpc_resp = &res,
2362         };
2363
2364         nfs_fattr_init(info->fattr);
2365         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2366 }
2367
2368 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2369                 struct nfs_fsinfo *info)
2370 {
2371         struct nfs4_exception exception = { };
2372         int err;
2373         do {
2374                 err = _nfs4_lookup_root(server, fhandle, info);
2375                 switch (err) {
2376                 case 0:
2377                 case -NFS4ERR_WRONGSEC:
2378                         goto out;
2379                 default:
2380                         err = nfs4_handle_exception(server, err, &exception);
2381                 }
2382         } while (exception.retry);
2383 out:
2384         return err;
2385 }
2386
2387 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2388                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2389 {
2390         struct rpc_auth *auth;
2391         int ret;
2392
2393         auth = rpcauth_create(flavor, server->client);
2394         if (IS_ERR(auth)) {
2395                 ret = -EIO;
2396                 goto out;
2397         }
2398         ret = nfs4_lookup_root(server, fhandle, info);
2399 out:
2400         return ret;
2401 }
2402
2403 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2404                               struct nfs_fsinfo *info)
2405 {
2406         int i, len, status = 0;
2407         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2408
2409         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2410         if (len < 0)
2411                 return len;
2412
2413         for (i = 0; i < len; i++) {
2414                 /* AUTH_UNIX is the default flavor if none was specified,
2415                  * thus has already been tried. */
2416                 if (flav_array[i] == RPC_AUTH_UNIX)
2417                         continue;
2418
2419                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2420                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2421                         continue;
2422                 break;
2423         }
2424         /*
2425          * -EACCESS could mean that the user doesn't have correct permissions
2426          * to access the mount.  It could also mean that we tried to mount
2427          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2428          * existing mount programs don't handle -EACCES very well so it should
2429          * be mapped to -EPERM instead.
2430          */
2431         if (status == -EACCES)
2432                 status = -EPERM;
2433         return status;
2434 }
2435
2436 /*
2437  * get the file handle for the "/" directory on the server
2438  */
2439 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2440                          struct nfs_fsinfo *info)
2441 {
2442         int minor_version = server->nfs_client->cl_minorversion;
2443         int status = nfs4_lookup_root(server, fhandle, info);
2444         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2445                 /*
2446                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2447                  * by nfs4_map_errors() as this function exits.
2448                  */
2449                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2450         if (status == 0)
2451                 status = nfs4_server_capabilities(server, fhandle);
2452         if (status == 0)
2453                 status = nfs4_do_fsinfo(server, fhandle, info);
2454         return nfs4_map_errors(status);
2455 }
2456
2457 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2458                               struct nfs_fsinfo *info)
2459 {
2460         int error;
2461         struct nfs_fattr *fattr = info->fattr;
2462
2463         error = nfs4_server_capabilities(server, mntfh);
2464         if (error < 0) {
2465                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2466                 return error;
2467         }
2468
2469         error = nfs4_proc_getattr(server, mntfh, fattr);
2470         if (error < 0) {
2471                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2472                 return error;
2473         }
2474
2475         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2476             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2477                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2478
2479         return error;
2480 }
2481
2482 /*
2483  * Get locations and (maybe) other attributes of a referral.
2484  * Note that we'll actually follow the referral later when
2485  * we detect fsid mismatch in inode revalidation
2486  */
2487 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2488                              const struct qstr *name, struct nfs_fattr *fattr,
2489                              struct nfs_fh *fhandle)
2490 {
2491         int status = -ENOMEM;
2492         struct page *page = NULL;
2493         struct nfs4_fs_locations *locations = NULL;
2494
2495         page = alloc_page(GFP_KERNEL);
2496         if (page == NULL)
2497                 goto out;
2498         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2499         if (locations == NULL)
2500                 goto out;
2501
2502         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2503         if (status != 0)
2504                 goto out;
2505         /* Make sure server returned a different fsid for the referral */
2506         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2507                 dprintk("%s: server did not return a different fsid for"
2508                         " a referral at %s\n", __func__, name->name);
2509                 status = -EIO;
2510                 goto out;
2511         }
2512         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2513         nfs_fixup_referral_attributes(&locations->fattr);
2514
2515         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2516         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2517         memset(fhandle, 0, sizeof(struct nfs_fh));
2518 out:
2519         if (page)
2520                 __free_page(page);
2521         kfree(locations);
2522         return status;
2523 }
2524
2525 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2526 {
2527         struct nfs4_getattr_arg args = {
2528                 .fh = fhandle,
2529                 .bitmask = server->attr_bitmask,
2530         };
2531         struct nfs4_getattr_res res = {
2532                 .fattr = fattr,
2533                 .server = server,
2534         };
2535         struct rpc_message msg = {
2536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2537                 .rpc_argp = &args,
2538                 .rpc_resp = &res,
2539         };
2540
2541         nfs_fattr_init(fattr);
2542         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2543 }
2544
2545 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2546 {
2547         struct nfs4_exception exception = { };
2548         int err;
2549         do {
2550                 err = nfs4_handle_exception(server,
2551                                 _nfs4_proc_getattr(server, fhandle, fattr),
2552                                 &exception);
2553         } while (exception.retry);
2554         return err;
2555 }
2556
2557 /*
2558  * The file is not closed if it is opened due to the a request to change
2559  * the size of the file. The open call will not be needed once the
2560  * VFS layer lookup-intents are implemented.
2561  *
2562  * Close is called when the inode is destroyed.
2563  * If we haven't opened the file for O_WRONLY, we
2564  * need to in the size_change case to obtain a stateid.
2565  *
2566  * Got race?
2567  * Because OPEN is always done by name in nfsv4, it is
2568  * possible that we opened a different file by the same
2569  * name.  We can recognize this race condition, but we
2570  * can't do anything about it besides returning an error.
2571  *
2572  * This will be fixed with VFS changes (lookup-intent).
2573  */
2574 static int
2575 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2576                   struct iattr *sattr)
2577 {
2578         struct inode *inode = dentry->d_inode;
2579         struct rpc_cred *cred = NULL;
2580         struct nfs4_state *state = NULL;
2581         int status;
2582
2583         if (pnfs_ld_layoutret_on_setattr(inode))
2584                 pnfs_return_layout(inode);
2585
2586         nfs_fattr_init(fattr);
2587
2588         /* Deal with open(O_TRUNC) */
2589         if (sattr->ia_valid & ATTR_OPEN)
2590                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2591
2592         /* Optimization: if the end result is no change, don't RPC */
2593         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2594                 return 0;
2595
2596         /* Search for an existing open(O_WRITE) file */
2597         if (sattr->ia_valid & ATTR_FILE) {
2598                 struct nfs_open_context *ctx;
2599
2600                 ctx = nfs_file_open_context(sattr->ia_file);
2601                 if (ctx) {
2602                         cred = ctx->cred;
2603                         state = ctx->state;
2604                 }
2605         }
2606
2607         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2608         if (status == 0)
2609                 nfs_setattr_update_inode(inode, sattr);
2610         return status;
2611 }
2612
2613 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2614                 const struct qstr *name, struct nfs_fh *fhandle,
2615                 struct nfs_fattr *fattr)
2616 {
2617         struct nfs_server *server = NFS_SERVER(dir);
2618         int                    status;
2619         struct nfs4_lookup_arg args = {
2620                 .bitmask = server->attr_bitmask,
2621                 .dir_fh = NFS_FH(dir),
2622                 .name = name,
2623         };
2624         struct nfs4_lookup_res res = {
2625                 .server = server,
2626                 .fattr = fattr,
2627                 .fh = fhandle,
2628         };
2629         struct rpc_message msg = {
2630                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2631                 .rpc_argp = &args,
2632                 .rpc_resp = &res,
2633         };
2634
2635         nfs_fattr_init(fattr);
2636
2637         dprintk("NFS call  lookup %s\n", name->name);
2638         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2639         dprintk("NFS reply lookup: %d\n", status);
2640         return status;
2641 }
2642
2643 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2644 {
2645         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2646                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2647         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2648         fattr->nlink = 2;
2649 }
2650
2651 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2652                                    struct qstr *name, struct nfs_fh *fhandle,
2653                                    struct nfs_fattr *fattr)
2654 {
2655         struct nfs4_exception exception = { };
2656         struct rpc_clnt *client = *clnt;
2657         int err;
2658         do {
2659                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2660                 switch (err) {
2661                 case -NFS4ERR_BADNAME:
2662                         err = -ENOENT;
2663                         goto out;
2664                 case -NFS4ERR_MOVED:
2665                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2666                         goto out;
2667                 case -NFS4ERR_WRONGSEC:
2668                         err = -EPERM;
2669                         if (client != *clnt)
2670                                 goto out;
2671
2672                         client = nfs4_create_sec_client(client, dir, name);
2673                         if (IS_ERR(client))
2674                                 return PTR_ERR(client);
2675
2676                         exception.retry = 1;
2677                         break;
2678                 default:
2679                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2680                 }
2681         } while (exception.retry);
2682
2683 out:
2684         if (err == 0)
2685                 *clnt = client;
2686         else if (client != *clnt)
2687                 rpc_shutdown_client(client);
2688
2689         return err;
2690 }
2691
2692 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2693                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2694 {
2695         int status;
2696         struct rpc_clnt *client = NFS_CLIENT(dir);
2697
2698         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2699         if (client != NFS_CLIENT(dir)) {
2700                 rpc_shutdown_client(client);
2701                 nfs_fixup_secinfo_attributes(fattr);
2702         }
2703         return status;
2704 }
2705
2706 struct rpc_clnt *
2707 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2708                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2709 {
2710         int status;
2711         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2712
2713         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2714         if (status < 0) {
2715                 rpc_shutdown_client(client);
2716                 return ERR_PTR(status);
2717         }
2718         return client;
2719 }
2720
2721 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2722 {
2723         struct nfs_server *server = NFS_SERVER(inode);
2724         struct nfs4_accessargs args = {
2725                 .fh = NFS_FH(inode),
2726                 .bitmask = server->cache_consistency_bitmask,
2727         };
2728         struct nfs4_accessres res = {
2729                 .server = server,
2730         };
2731         struct rpc_message msg = {
2732                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2733                 .rpc_argp = &args,
2734                 .rpc_resp = &res,
2735                 .rpc_cred = entry->cred,
2736         };
2737         int mode = entry->mask;
2738         int status;
2739
2740         /*
2741          * Determine which access bits we want to ask for...
2742          */
2743         if (mode & MAY_READ)
2744                 args.access |= NFS4_ACCESS_READ;
2745         if (S_ISDIR(inode->i_mode)) {
2746                 if (mode & MAY_WRITE)
2747                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2748                 if (mode & MAY_EXEC)
2749                         args.access |= NFS4_ACCESS_LOOKUP;
2750         } else {
2751                 if (mode & MAY_WRITE)
2752                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2753                 if (mode & MAY_EXEC)
2754                         args.access |= NFS4_ACCESS_EXECUTE;
2755         }
2756
2757         res.fattr = nfs_alloc_fattr();
2758         if (res.fattr == NULL)
2759                 return -ENOMEM;
2760
2761         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2762         if (!status) {
2763                 nfs_access_set_mask(entry, res.access);
2764                 nfs_refresh_inode(inode, res.fattr);
2765         }
2766         nfs_free_fattr(res.fattr);
2767         return status;
2768 }
2769
2770 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2771 {
2772         struct nfs4_exception exception = { };
2773         int err;
2774         do {
2775                 err = nfs4_handle_exception(NFS_SERVER(inode),
2776                                 _nfs4_proc_access(inode, entry),
2777                                 &exception);
2778         } while (exception.retry);
2779         return err;
2780 }
2781
2782 /*
2783  * TODO: For the time being, we don't try to get any attributes
2784  * along with any of the zero-copy operations READ, READDIR,
2785  * READLINK, WRITE.
2786  *
2787  * In the case of the first three, we want to put the GETATTR
2788  * after the read-type operation -- this is because it is hard
2789  * to predict the length of a GETATTR response in v4, and thus
2790  * align the READ data correctly.  This means that the GETATTR
2791  * may end up partially falling into the page cache, and we should
2792  * shift it into the 'tail' of the xdr_buf before processing.
2793  * To do this efficiently, we need to know the total length
2794  * of data received, which doesn't seem to be available outside
2795  * of the RPC layer.
2796  *
2797  * In the case of WRITE, we also want to put the GETATTR after
2798  * the operation -- in this case because we want to make sure
2799  * we get the post-operation mtime and size.
2800  *
2801  * Both of these changes to the XDR layer would in fact be quite
2802  * minor, but I decided to leave them for a subsequent patch.
2803  */
2804 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2805                 unsigned int pgbase, unsigned int pglen)
2806 {
2807         struct nfs4_readlink args = {
2808                 .fh       = NFS_FH(inode),
2809                 .pgbase   = pgbase,
2810                 .pglen    = pglen,
2811                 .pages    = &page,
2812         };
2813         struct nfs4_readlink_res res;
2814         struct rpc_message msg = {
2815                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2816                 .rpc_argp = &args,
2817                 .rpc_resp = &res,
2818         };
2819
2820         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2821 }
2822
2823 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2824                 unsigned int pgbase, unsigned int pglen)
2825 {
2826         struct nfs4_exception exception = { };
2827         int err;
2828         do {
2829                 err = nfs4_handle_exception(NFS_SERVER(inode),
2830                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2831                                 &exception);
2832         } while (exception.retry);
2833         return err;
2834 }
2835
2836 /*
2837  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2838  */
2839 static int
2840 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2841                  int flags)
2842 {
2843         struct nfs_open_context *ctx;
2844         struct nfs4_state *state;
2845         int status = 0;
2846
2847         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2848         if (IS_ERR(ctx))
2849                 return PTR_ERR(ctx);
2850
2851         sattr->ia_mode &= ~current_umask();
2852         state = nfs4_do_open(dir, dentry, ctx->mode,
2853                         flags, sattr, ctx->cred,
2854                         &ctx->mdsthreshold);
2855         d_drop(dentry);
2856         if (IS_ERR(state)) {
2857                 status = PTR_ERR(state);
2858                 goto out;
2859         }
2860         d_add(dentry, igrab(state->inode));
2861         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2862         ctx->state = state;
2863 out:
2864         put_nfs_open_context(ctx);
2865         return status;
2866 }
2867
2868 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2869 {
2870         struct nfs_server *server = NFS_SERVER(dir);
2871         struct nfs_removeargs args = {
2872                 .fh = NFS_FH(dir),
2873                 .name = *name,
2874         };
2875         struct nfs_removeres res = {
2876                 .server = server,
2877         };
2878         struct rpc_message msg = {
2879                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2880                 .rpc_argp = &args,
2881                 .rpc_resp = &res,
2882         };
2883         int status;
2884
2885         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2886         if (status == 0)
2887                 update_changeattr(dir, &res.cinfo);
2888         return status;
2889 }
2890
2891 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2892 {
2893         struct nfs4_exception exception = { };
2894         int err;
2895         do {
2896                 err = nfs4_handle_exception(NFS_SERVER(dir),
2897                                 _nfs4_proc_remove(dir, name),
2898                                 &exception);
2899         } while (exception.retry);
2900         return err;
2901 }
2902
2903 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2904 {
2905         struct nfs_server *server = NFS_SERVER(dir);
2906         struct nfs_removeargs *args = msg->rpc_argp;
2907         struct nfs_removeres *res = msg->rpc_resp;
2908
2909         res->server = server;
2910         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2911         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2912 }
2913
2914 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2915 {
2916         nfs4_setup_sequence(NFS_SERVER(data->dir),
2917                         &data->args.seq_args,
2918                         &data->res.seq_res,
2919                         task);
2920 }
2921
2922 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2923 {
2924         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2925
2926         if (!nfs4_sequence_done(task, &res->seq_res))
2927                 return 0;
2928         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2929                 return 0;
2930         update_changeattr(dir, &res->cinfo);
2931         return 1;
2932 }
2933
2934 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2935 {
2936         struct nfs_server *server = NFS_SERVER(dir);
2937         struct nfs_renameargs *arg = msg->rpc_argp;
2938         struct nfs_renameres *res = msg->rpc_resp;
2939
2940         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2941         res->server = server;
2942         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2943 }
2944
2945 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2946 {
2947         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2948                         &data->args.seq_args,
2949                         &data->res.seq_res,
2950                         task);
2951 }
2952
2953 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2954                                  struct inode *new_dir)
2955 {
2956         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2957
2958         if (!nfs4_sequence_done(task, &res->seq_res))
2959                 return 0;
2960         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2961                 return 0;
2962
2963         update_changeattr(old_dir, &res->old_cinfo);
2964         update_changeattr(new_dir, &res->new_cinfo);
2965         return 1;
2966 }
2967
2968 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2969                 struct inode *new_dir, struct qstr *new_name)
2970 {
2971         struct nfs_server *server = NFS_SERVER(old_dir);
2972         struct nfs_renameargs arg = {
2973                 .old_dir = NFS_FH(old_dir),
2974                 .new_dir = NFS_FH(new_dir),
2975                 .old_name = old_name,
2976                 .new_name = new_name,
2977         };
2978         struct nfs_renameres res = {
2979                 .server = server,
2980         };
2981         struct rpc_message msg = {
2982                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2983                 .rpc_argp = &arg,
2984                 .rpc_resp = &res,
2985         };
2986         int status = -ENOMEM;
2987
2988         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2989         if (!status) {
2990                 update_changeattr(old_dir, &res.old_cinfo);
2991                 update_changeattr(new_dir, &res.new_cinfo);
2992         }
2993         return status;
2994 }
2995
2996 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2997                 struct inode *new_dir, struct qstr *new_name)
2998 {
2999         struct nfs4_exception exception = { };
3000         int err;
3001         do {
3002                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3003                                 _nfs4_proc_rename(old_dir, old_name,
3004                                         new_dir, new_name),
3005                                 &exception);
3006         } while (exception.retry);
3007         return err;
3008 }
3009
3010 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3011 {
3012         struct nfs_server *server = NFS_SERVER(inode);
3013         struct nfs4_link_arg arg = {
3014                 .fh     = NFS_FH(inode),
3015                 .dir_fh = NFS_FH(dir),
3016                 .name   = name,
3017                 .bitmask = server->attr_bitmask,
3018         };
3019         struct nfs4_link_res res = {
3020                 .server = server,
3021         };
3022         struct rpc_message msg = {
3023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3024                 .rpc_argp = &arg,
3025                 .rpc_resp = &res,
3026         };
3027         int status = -ENOMEM;
3028
3029         res.fattr = nfs_alloc_fattr();
3030         if (res.fattr == NULL)
3031                 goto out;
3032
3033         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3034         if (!status) {
3035                 update_changeattr(dir, &res.cinfo);
3036                 nfs_post_op_update_inode(inode, res.fattr);
3037         }
3038 out:
3039         nfs_free_fattr(res.fattr);
3040         return status;
3041 }
3042
3043 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3044 {
3045         struct nfs4_exception exception = { };
3046         int err;
3047         do {
3048                 err = nfs4_handle_exception(NFS_SERVER(inode),
3049                                 _nfs4_proc_link(inode, dir, name),
3050                                 &exception);
3051         } while (exception.retry);
3052         return err;
3053 }
3054
3055 struct nfs4_createdata {
3056         struct rpc_message msg;
3057         struct nfs4_create_arg arg;
3058         struct nfs4_create_res res;
3059         struct nfs_fh fh;
3060         struct nfs_fattr fattr;
3061 };
3062
3063 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3064                 struct qstr *name, struct iattr *sattr, u32 ftype)
3065 {
3066         struct nfs4_createdata *data;
3067
3068         data = kzalloc(sizeof(*data), GFP_KERNEL);
3069         if (data != NULL) {
3070                 struct nfs_server *server = NFS_SERVER(dir);
3071
3072                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3073                 data->msg.rpc_argp = &data->arg;
3074                 data->msg.rpc_resp = &data->res;
3075                 data->arg.dir_fh = NFS_FH(dir);
3076                 data->arg.server = server;
3077                 data->arg.name = name;
3078                 data->arg.attrs = sattr;
3079                 data->arg.ftype = ftype;
3080                 data->arg.bitmask = server->attr_bitmask;
3081                 data->res.server = server;
3082                 data->res.fh = &data->fh;
3083                 data->res.fattr = &data->fattr;
3084                 nfs_fattr_init(data->res.fattr);
3085         }
3086         return data;
3087 }
3088
3089 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3090 {
3091         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3092                                     &data->arg.seq_args, &data->res.seq_res, 1);
3093         if (status == 0) {
3094                 update_changeattr(dir, &data->res.dir_cinfo);
3095                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3096         }
3097         return status;
3098 }
3099
3100 static void nfs4_free_createdata(struct nfs4_createdata *data)
3101 {
3102         kfree(data);
3103 }
3104
3105 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3106                 struct page *page, unsigned int len, struct iattr *sattr)
3107 {
3108         struct nfs4_createdata *data;
3109         int status = -ENAMETOOLONG;
3110
3111         if (len > NFS4_MAXPATHLEN)
3112                 goto out;
3113
3114         status = -ENOMEM;
3115         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3116         if (data == NULL)
3117                 goto out;
3118
3119         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3120         data->arg.u.symlink.pages = &page;
3121         data->arg.u.symlink.len = len;
3122
3123         status = nfs4_do_create(dir, dentry, data);
3124
3125         nfs4_free_createdata(data);
3126 out:
3127         return status;
3128 }
3129
3130 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3131                 struct page *page, unsigned int len, struct iattr *sattr)
3132 {
3133         struct nfs4_exception exception = { };
3134         int err;
3135         do {
3136                 err = nfs4_handle_exception(NFS_SERVER(dir),
3137                                 _nfs4_proc_symlink(dir, dentry, page,
3138                                                         len, sattr),
3139                                 &exception);
3140         } while (exception.retry);
3141         return err;
3142 }
3143
3144 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3145                 struct iattr *sattr)
3146 {
3147         struct nfs4_createdata *data;
3148         int status = -ENOMEM;
3149
3150         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3151         if (data == NULL)
3152                 goto out;
3153
3154         status = nfs4_do_create(dir, dentry, data);
3155
3156         nfs4_free_createdata(data);
3157 out:
3158         return status;
3159 }
3160
3161 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3162                 struct iattr *sattr)
3163 {
3164         struct nfs4_exception exception = { };
3165         int err;
3166
3167         sattr->ia_mode &= ~current_umask();
3168         do {
3169                 err = nfs4_handle_exception(NFS_SERVER(dir),
3170                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3171                                 &exception);
3172         } while (exception.retry);
3173         return err;
3174 }
3175
3176 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3177                 u64 cookie, struct page **pages, unsigned int count, int plus)
3178 {
3179         struct inode            *dir = dentry->d_inode;
3180         struct nfs4_readdir_arg args = {
3181                 .fh = NFS_FH(dir),
3182                 .pages = pages,
3183                 .pgbase = 0,
3184                 .count = count,
3185                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3186                 .plus = plus,
3187         };
3188         struct nfs4_readdir_res res;
3189         struct rpc_message msg = {
3190                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3191                 .rpc_argp = &args,
3192                 .rpc_resp = &res,
3193                 .rpc_cred = cred,
3194         };
3195         int                     status;
3196
3197         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3198                         dentry->d_parent->d_name.name,
3199                         dentry->d_name.name,
3200                         (unsigned long long)cookie);
3201         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3202         res.pgbase = args.pgbase;
3203         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3204         if (status >= 0) {
3205                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3206                 status += args.pgbase;
3207         }
3208
3209         nfs_invalidate_atime(dir);
3210
3211         dprintk("%s: returns %d\n", __func__, status);
3212         return status;
3213 }
3214
3215 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3216                 u64 cookie, struct page **pages, unsigned int count, int plus)
3217 {
3218         struct nfs4_exception exception = { };
3219         int err;
3220         do {
3221                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3222                                 _nfs4_proc_readdir(dentry, cred, cookie,
3223                                         pages, count, plus),
3224                                 &exception);
3225         } while (exception.retry);
3226         return err;
3227 }
3228
3229 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3230                 struct iattr *sattr, dev_t rdev)
3231 {
3232         struct nfs4_createdata *data;
3233         int mode = sattr->ia_mode;
3234         int status = -ENOMEM;
3235
3236         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3237         if (data == NULL)
3238                 goto out;
3239
3240         if (S_ISFIFO(mode))
3241                 data->arg.ftype = NF4FIFO;
3242         else if (S_ISBLK(mode)) {
3243                 data->arg.ftype = NF4BLK;
3244                 data->arg.u.device.specdata1 = MAJOR(rdev);
3245                 data->arg.u.device.specdata2 = MINOR(rdev);
3246         }
3247         else if (S_ISCHR(mode)) {
3248                 data->arg.ftype = NF4CHR;
3249                 data->arg.u.device.specdata1 = MAJOR(rdev);
3250                 data->arg.u.device.specdata2 = MINOR(rdev);
3251         } else if (!S_ISSOCK(mode)) {
3252                 status = -EINVAL;
3253                 goto out_free;
3254         }
3255
3256         status = nfs4_do_create(dir, dentry, data);
3257 out_free:
3258         nfs4_free_createdata(data);
3259 out:
3260         return status;
3261 }
3262
3263 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3264                 struct iattr *sattr, dev_t rdev)
3265 {
3266         struct nfs4_exception exception = { };
3267         int err;
3268
3269         sattr->ia_mode &= ~current_umask();
3270         do {
3271                 err = nfs4_handle_exception(NFS_SERVER(dir),
3272                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3273                                 &exception);
3274         } while (exception.retry);
3275         return err;
3276 }
3277
3278 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3279                  struct nfs_fsstat *fsstat)
3280 {
3281         struct nfs4_statfs_arg args = {
3282                 .fh = fhandle,
3283                 .bitmask = server->attr_bitmask,
3284         };
3285         struct nfs4_statfs_res res = {
3286                 .fsstat = fsstat,
3287         };
3288         struct rpc_message msg = {
3289                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3290                 .rpc_argp = &args,
3291                 .rpc_resp = &res,
3292         };
3293
3294         nfs_fattr_init(fsstat->fattr);
3295         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3296 }
3297
3298 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3299 {
3300         struct nfs4_exception exception = { };
3301         int err;
3302         do {
3303                 err = nfs4_handle_exception(server,
3304                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3305                                 &exception);
3306         } while (exception.retry);
3307         return err;
3308 }
3309
3310 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3311                 struct nfs_fsinfo *fsinfo)
3312 {
3313         struct nfs4_fsinfo_arg args = {
3314                 .fh = fhandle,
3315                 .bitmask = server->attr_bitmask,
3316         };
3317         struct nfs4_fsinfo_res res = {
3318                 .fsinfo = fsinfo,
3319         };
3320         struct rpc_message msg = {
3321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3322                 .rpc_argp = &args,
3323                 .rpc_resp = &res,
3324         };
3325
3326         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3327 }
3328
3329 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3330 {
3331         struct nfs4_exception exception = { };
3332         int err;
3333
3334         do {
3335                 err = nfs4_handle_exception(server,
3336                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3337                                 &exception);
3338         } while (exception.retry);
3339         return err;
3340 }
3341
3342 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3343 {
3344         int error;
3345
3346         nfs_fattr_init(fsinfo->fattr);
3347         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3348         if (error == 0) {
3349                 /* block layout checks this! */
3350                 server->pnfs_blksize = fsinfo->blksize;
3351                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3352         }
3353
3354         return error;
3355 }
3356
3357 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3358                 struct nfs_pathconf *pathconf)
3359 {
3360         struct nfs4_pathconf_arg args = {
3361                 .fh = fhandle,
3362                 .bitmask = server->attr_bitmask,
3363         };
3364         struct nfs4_pathconf_res res = {
3365                 .pathconf = pathconf,
3366         };
3367         struct rpc_message msg = {
3368                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3369                 .rpc_argp = &args,
3370                 .rpc_resp = &res,
3371         };
3372
3373         /* None of the pathconf attributes are mandatory to implement */
3374         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3375                 memset(pathconf, 0, sizeof(*pathconf));
3376                 return 0;
3377         }
3378
3379         nfs_fattr_init(pathconf->fattr);
3380         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3381 }
3382
3383 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3384                 struct nfs_pathconf *pathconf)
3385 {
3386         struct nfs4_exception exception = { };
3387         int err;
3388
3389         do {
3390                 err = nfs4_handle_exception(server,
3391                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3392                                 &exception);
3393         } while (exception.retry);
3394         return err;
3395 }
3396
3397 void __nfs4_read_done_cb(struct nfs_read_data *data)
3398 {
3399         nfs_invalidate_atime(data->header->inode);
3400 }
3401
3402 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3403 {
3404         struct nfs_server *server = NFS_SERVER(data->header->inode);
3405
3406         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3407                 rpc_restart_call_prepare(task);
3408                 return -EAGAIN;
3409         }
3410
3411         __nfs4_read_done_cb(data);
3412         if (task->tk_status > 0)
3413                 renew_lease(server, data->timestamp);
3414         return 0;
3415 }
3416
3417 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3418 {
3419
3420         dprintk("--> %s\n", __func__);
3421
3422         if (!nfs4_sequence_done(task, &data->res.seq_res))
3423                 return -EAGAIN;
3424
3425         return data->read_done_cb ? data->read_done_cb(task, data) :
3426                                     nfs4_read_done_cb(task, data);
3427 }
3428
3429 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3430 {
3431         data->timestamp   = jiffies;
3432         data->read_done_cb = nfs4_read_done_cb;
3433         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3434         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3435 }
3436
3437 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3438 {
3439         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3440                         &data->args.seq_args,
3441                         &data->res.seq_res,
3442                         task);
3443 }
3444
3445 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3446 {
3447         struct inode *inode = data->header->inode;
3448
3449         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3450                 rpc_restart_call_prepare(task);
3451                 return -EAGAIN;
3452         }
3453         if (task->tk_status >= 0) {
3454                 renew_lease(NFS_SERVER(inode), data->timestamp);
3455                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3456         }
3457         return 0;
3458 }
3459
3460 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3461 {
3462         if (!nfs4_sequence_done(task, &data->res.seq_res))
3463                 return -EAGAIN;
3464         return data->write_done_cb ? data->write_done_cb(task, data) :
3465                 nfs4_write_done_cb(task, data);
3466 }
3467
3468 static
3469 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3470 {
3471         const struct nfs_pgio_header *hdr = data->header;
3472
3473         /* Don't request attributes for pNFS or O_DIRECT writes */
3474         if (data->ds_clp != NULL || hdr->dreq != NULL)
3475                 return false;
3476         /* Otherwise, request attributes if and only if we don't hold
3477          * a delegation
3478          */
3479         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3480 }
3481
3482 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3483 {
3484         struct nfs_server *server = NFS_SERVER(data->header->inode);
3485
3486         if (!nfs4_write_need_cache_consistency_data(data)) {
3487                 data->args.bitmask = NULL;
3488                 data->res.fattr = NULL;
3489         } else
3490                 data->args.bitmask = server->cache_consistency_bitmask;
3491
3492         if (!data->write_done_cb)
3493                 data->write_done_cb = nfs4_write_done_cb;
3494         data->res.server = server;
3495         data->timestamp   = jiffies;
3496
3497         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3498         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3499 }
3500
3501 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3502 {
3503         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3504                         &data->args.seq_args,
3505                         &data->res.seq_res,
3506                         task);
3507 }
3508
3509 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3510 {
3511         nfs4_setup_sequence(NFS_SERVER(data->inode),
3512                         &data->args.seq_args,
3513                         &data->res.seq_res,
3514                         task);
3515 }
3516
3517 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3518 {
3519         struct inode *inode = data->inode;
3520
3521         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3522                 rpc_restart_call_prepare(task);
3523                 return -EAGAIN;
3524         }
3525         return 0;
3526 }
3527
3528 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3529 {
3530         if (!nfs4_sequence_done(task, &data->res.seq_res))
3531                 return -EAGAIN;
3532         return data->commit_done_cb(task, data);
3533 }
3534
3535 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3536 {
3537         struct nfs_server *server = NFS_SERVER(data->inode);
3538
3539         if (data->commit_done_cb == NULL)
3540                 data->commit_done_cb = nfs4_commit_done_cb;
3541         data->res.server = server;
3542         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3543         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3544 }
3545
3546 struct nfs4_renewdata {
3547         struct nfs_client       *client;
3548         unsigned long           timestamp;
3549 };
3550
3551 /*
3552  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3553  * standalone procedure for queueing an asynchronous RENEW.
3554  */
3555 static void nfs4_renew_release(void *calldata)
3556 {
3557         struct nfs4_renewdata *data = calldata;
3558         struct nfs_client *clp = data->client;
3559
3560         if (atomic_read(&clp->cl_count) > 1)
3561                 nfs4_schedule_state_renewal(clp);
3562         nfs_put_client(clp);
3563         kfree(data);
3564 }
3565
3566 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3567 {
3568         struct nfs4_renewdata *data = calldata;
3569         struct nfs_client *clp = data->client;
3570         unsigned long timestamp = data->timestamp;
3571
3572         if (task->tk_status < 0) {
3573                 /* Unless we're shutting down, schedule state recovery! */
3574                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3575                         return;
3576                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3577                         nfs4_schedule_lease_recovery(clp);
3578                         return;
3579                 }
3580                 nfs4_schedule_path_down_recovery(clp);
3581         }
3582         do_renew_lease(clp, timestamp);
3583 }
3584
3585 static const struct rpc_call_ops nfs4_renew_ops = {
3586         .rpc_call_done = nfs4_renew_done,
3587         .rpc_release = nfs4_renew_release,
3588 };
3589
3590 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3591 {
3592         struct rpc_message msg = {
3593                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3594                 .rpc_argp       = clp,
3595                 .rpc_cred       = cred,
3596         };
3597         struct nfs4_renewdata *data;
3598
3599         if (renew_flags == 0)
3600                 return 0;
3601         if (!atomic_inc_not_zero(&clp->cl_count))
3602                 return -EIO;
3603         data = kmalloc(sizeof(*data), GFP_NOFS);
3604         if (data == NULL)
3605                 return -ENOMEM;
3606         data->client = clp;
3607         data->timestamp = jiffies;
3608         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3609                         &nfs4_renew_ops, data);
3610 }
3611
3612 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3613 {
3614         struct rpc_message msg = {
3615                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3616                 .rpc_argp       = clp,
3617                 .rpc_cred       = cred,
3618         };
3619         unsigned long now = jiffies;
3620         int status;
3621
3622         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3623         if (status < 0)
3624                 return status;
3625         do_renew_lease(clp, now);
3626         return 0;
3627 }
3628
3629 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3630 {
3631         return (server->caps & NFS_CAP_ACLS)
3632                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3633                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3634 }
3635
3636 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3637  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3638  * the stack.
3639  */
3640 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3641
3642 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3643                 struct page **pages, unsigned int *pgbase)
3644 {
3645         struct page *newpage, **spages;
3646         int rc = 0;
3647         size_t len;
3648         spages = pages;
3649
3650         do {
3651                 len = min_t(size_t, PAGE_SIZE, buflen);
3652                 newpage = alloc_page(GFP_KERNEL);
3653
3654                 if (newpage == NULL)
3655                         goto unwind;
3656                 memcpy(page_address(newpage), buf, len);
3657                 buf += len;
3658                 buflen -= len;
3659                 *pages++ = newpage;
3660                 rc++;
3661         } while (buflen != 0);
3662
3663         return rc;
3664
3665 unwind:
3666         for(; rc > 0; rc--)
3667                 __free_page(spages[rc-1]);
3668         return -ENOMEM;
3669 }
3670
3671 struct nfs4_cached_acl {
3672         int cached;
3673         size_t len;
3674         char data[0];
3675 };
3676
3677 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3678 {
3679         struct nfs_inode *nfsi = NFS_I(inode);
3680
3681         spin_lock(&inode->i_lock);
3682         kfree(nfsi->nfs4_acl);
3683         nfsi->nfs4_acl = acl;
3684         spin_unlock(&inode->i_lock);
3685 }
3686
3687 static void nfs4_zap_acl_attr(struct inode *inode)
3688 {
3689         nfs4_set_cached_acl(inode, NULL);
3690 }
3691
3692 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3693 {
3694         struct nfs_inode *nfsi = NFS_I(inode);
3695         struct nfs4_cached_acl *acl;
3696         int ret = -ENOENT;
3697
3698         spin_lock(&inode->i_lock);
3699         acl = nfsi->nfs4_acl;
3700         if (acl == NULL)
3701                 goto out;
3702         if (buf == NULL) /* user is just asking for length */
3703                 goto out_len;
3704         if (acl->cached == 0)
3705                 goto out;
3706         ret = -ERANGE; /* see getxattr(2) man page */
3707         if (acl->len > buflen)
3708                 goto out;
3709         memcpy(buf, acl->data, acl->len);
3710 out_len:
3711         ret = acl->len;
3712 out:
3713         spin_unlock(&inode->i_lock);
3714         return ret;
3715 }
3716
3717 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3718 {
3719         struct nfs4_cached_acl *acl;
3720         size_t buflen = sizeof(*acl) + acl_len;
3721
3722         if (buflen <= PAGE_SIZE) {
3723                 acl = kmalloc(buflen, GFP_KERNEL);
3724                 if (acl == NULL)
3725                         goto out;
3726                 acl->cached = 1;
3727                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3728         } else {
3729                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3730                 if (acl == NULL)
3731                         goto out;
3732                 acl->cached = 0;
3733         }
3734         acl->len = acl_len;
3735 out:
3736         nfs4_set_cached_acl(inode, acl);
3737 }
3738
3739 /*
3740  * The getxattr API returns the required buffer length when called with a
3741  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3742  * the required buf.  On a NULL buf, we send a page of data to the server
3743  * guessing that the ACL request can be serviced by a page. If so, we cache
3744  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3745  * the cache. If not so, we throw away the page, and cache the required
3746  * length. The next getxattr call will then produce another round trip to
3747  * the server, this time with the input buf of the required size.
3748  */
3749 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3750 {
3751         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3752         struct nfs_getaclargs args = {
3753                 .fh = NFS_FH(inode),
3754                 .acl_pages = pages,
3755                 .acl_len = buflen,
3756         };
3757         struct nfs_getaclres res = {
3758                 .acl_len = buflen,
3759         };
3760         struct rpc_message msg = {
3761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3762                 .rpc_argp = &args,
3763                 .rpc_resp = &res,
3764         };
3765         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3766         int ret = -ENOMEM, i;
3767
3768         /* As long as we're doing a round trip to the server anyway,
3769          * let's be prepared for a page of acl data. */
3770         if (npages == 0)
3771                 npages = 1;
3772         if (npages > ARRAY_SIZE(pages))
3773                 return -ERANGE;
3774
3775         for (i = 0; i < npages; i++) {
3776                 pages[i] = alloc_page(GFP_KERNEL);
3777                 if (!pages[i])
3778                         goto out_free;
3779         }
3780
3781         /* for decoding across pages */
3782         res.acl_scratch = alloc_page(GFP_KERNEL);
3783         if (!res.acl_scratch)
3784                 goto out_free;
3785
3786         args.acl_len = npages * PAGE_SIZE;
3787         args.acl_pgbase = 0;
3788
3789         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3790                 __func__, buf, buflen, npages, args.acl_len);
3791         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3792                              &msg, &args.seq_args, &res.seq_res, 0);
3793         if (ret)
3794                 goto out_free;
3795
3796         /* Handle the case where the passed-in buffer is too short */
3797         if (res.acl_flags & NFS4_ACL_TRUNC) {
3798                 /* Did the user only issue a request for the acl length? */
3799                 if (buf == NULL)
3800                         goto out_ok;
3801                 ret = -ERANGE;
3802                 goto out_free;
3803         }
3804         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3805         if (buf)
3806                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3807 out_ok:
3808         ret = res.acl_len;
3809 out_free:
3810         for (i = 0; i < npages; i++)
3811                 if (pages[i])
3812                         __free_page(pages[i]);
3813         if (res.acl_scratch)
3814                 __free_page(res.acl_scratch);
3815         return ret;
3816 }
3817
3818 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3819 {
3820         struct nfs4_exception exception = { };
3821         ssize_t ret;
3822         do {
3823                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3824                 if (ret >= 0)
3825                         break;
3826                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3827         } while (exception.retry);
3828         return ret;
3829 }
3830
3831 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3832 {
3833         struct nfs_server *server = NFS_SERVER(inode);
3834         int ret;
3835
3836         if (!nfs4_server_supports_acls(server))
3837                 return -EOPNOTSUPP;
3838         ret = nfs_revalidate_inode(server, inode);
3839         if (ret < 0)
3840                 return ret;
3841         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3842                 nfs_zap_acl_cache(inode);
3843         ret = nfs4_read_cached_acl(inode, buf, buflen);
3844         if (ret != -ENOENT)
3845                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3846                  * but no cached acl data, just the acl length */
3847                 return ret;
3848         return nfs4_get_acl_uncached(inode, buf, buflen);
3849 }
3850
3851 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3852 {
3853         struct nfs_server *server = NFS_SERVER(inode);
3854         struct page *pages[NFS4ACL_MAXPAGES];
3855         struct nfs_setaclargs arg = {
3856                 .fh             = NFS_FH(inode),
3857                 .acl_pages      = pages,
3858                 .acl_len        = buflen,
3859         };
3860         struct nfs_setaclres res;
3861         struct rpc_message msg = {
3862                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3863                 .rpc_argp       = &arg,
3864                 .rpc_resp       = &res,
3865         };
3866         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3867         int ret, i;
3868
3869         if (!nfs4_server_supports_acls(server))
3870                 return -EOPNOTSUPP;
3871         if (npages > ARRAY_SIZE(pages))
3872                 return -ERANGE;
3873         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3874         if (i < 0)
3875                 return i;
3876         nfs4_inode_return_delegation(inode);
3877         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3878
3879         /*
3880          * Free each page after tx, so the only ref left is
3881          * held by the network stack
3882          */
3883         for (; i > 0; i--)
3884                 put_page(pages[i-1]);
3885
3886         /*
3887          * Acl update can result in inode attribute update.
3888          * so mark the attribute cache invalid.
3889          */
3890         spin_lock(&inode->i_lock);
3891         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3892         spin_unlock(&inode->i_lock);
3893         nfs_access_zap_cache(inode);
3894         nfs_zap_acl_cache(inode);
3895         return ret;
3896 }
3897
3898 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3899 {
3900         struct nfs4_exception exception = { };
3901         int err;
3902         do {
3903                 err = nfs4_handle_exception(NFS_SERVER(inode),
3904                                 __nfs4_proc_set_acl(inode, buf, buflen),
3905                                 &exception);
3906         } while (exception.retry);
3907         return err;
3908 }
3909
3910 static int
3911 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3912 {
3913         struct nfs_client *clp = server->nfs_client;
3914
3915         if (task->tk_status >= 0)
3916                 return 0;
3917         switch(task->tk_status) {
3918                 case -NFS4ERR_DELEG_REVOKED:
3919                 case -NFS4ERR_ADMIN_REVOKED:
3920                 case -NFS4ERR_BAD_STATEID:
3921                         if (state == NULL)
3922                                 break;
3923                         nfs_remove_bad_delegation(state->inode);
3924                 case -NFS4ERR_OPENMODE:
3925                         if (state == NULL)
3926                                 break;
3927                         nfs4_schedule_stateid_recovery(server, state);
3928                         goto wait_on_recovery;
3929                 case -NFS4ERR_EXPIRED:
3930                         if (state != NULL)
3931                                 nfs4_schedule_stateid_recovery(server, state);
3932                 case -NFS4ERR_STALE_STATEID:
3933                 case -NFS4ERR_STALE_CLIENTID:
3934                         nfs4_schedule_lease_recovery(clp);
3935                         goto wait_on_recovery;
3936 #if defined(CONFIG_NFS_V4_1)
3937                 case -NFS4ERR_BADSESSION:
3938                 case -NFS4ERR_BADSLOT:
3939                 case -NFS4ERR_BAD_HIGH_SLOT:
3940                 case -NFS4ERR_DEADSESSION:
3941                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3942                 case -NFS4ERR_SEQ_FALSE_RETRY:
3943                 case -NFS4ERR_SEQ_MISORDERED:
3944                         dprintk("%s ERROR %d, Reset session\n", __func__,
3945                                 task->tk_status);
3946                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3947                         task->tk_status = 0;
3948                         return -EAGAIN;
3949 #endif /* CONFIG_NFS_V4_1 */
3950                 case -NFS4ERR_DELAY:
3951                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3952                 case -NFS4ERR_GRACE:
3953                 case -EKEYEXPIRED:
3954                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3955                         task->tk_status = 0;
3956                         return -EAGAIN;
3957                 case -NFS4ERR_RETRY_UNCACHED_REP:
3958                 case -NFS4ERR_OLD_STATEID:
3959                         task->tk_status = 0;
3960                         return -EAGAIN;
3961         }
3962         task->tk_status = nfs4_map_errors(task->tk_status);
3963         return 0;
3964 wait_on_recovery:
3965         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3966         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3967                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3968         task->tk_status = 0;
3969         return -EAGAIN;
3970 }
3971
3972 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3973                                     nfs4_verifier *bootverf)
3974 {
3975         __be32 verf[2];
3976
3977         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3978                 /* An impossible timestamp guarantees this value
3979                  * will never match a generated boot time. */
3980                 verf[0] = 0;
3981                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3982         } else {
3983                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3984                 verf[0] = (__be32)nn->boot_time.tv_sec;
3985                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3986         }
3987         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3988 }
3989
3990 static unsigned int
3991 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
3992                                    char *buf, size_t len)
3993 {
3994         unsigned int result;
3995
3996         rcu_read_lock();
3997         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
3998                                 clp->cl_ipaddr,
3999                                 rpc_peeraddr2str(clp->cl_rpcclient,
4000                                                         RPC_DISPLAY_ADDR),
4001                                 rpc_peeraddr2str(clp->cl_rpcclient,
4002                                                         RPC_DISPLAY_PROTO));
4003         rcu_read_unlock();
4004         return result;
4005 }
4006
4007 static unsigned int
4008 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4009                                 char *buf, size_t len)
4010 {
4011         char *nodename = clp->cl_rpcclient->cl_nodename;
4012
4013         if (nfs4_client_id_uniquifier[0] != '\0')
4014                 nodename = nfs4_client_id_uniquifier;
4015         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4016                                 clp->rpc_ops->version, clp->cl_minorversion,
4017                                 nodename);
4018 }
4019
4020 /**
4021  * nfs4_proc_setclientid - Negotiate client ID
4022  * @clp: state data structure
4023  * @program: RPC program for NFSv4 callback service
4024  * @port: IP port number for NFS4 callback service
4025  * @cred: RPC credential to use for this call
4026  * @res: where to place the result
4027  *
4028  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4029  */
4030 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4031                 unsigned short port, struct rpc_cred *cred,
4032                 struct nfs4_setclientid_res *res)
4033 {
4034         nfs4_verifier sc_verifier;
4035         struct nfs4_setclientid setclientid = {
4036                 .sc_verifier = &sc_verifier,
4037                 .sc_prog = program,
4038                 .sc_cb_ident = clp->cl_cb_ident,
4039         };
4040         struct rpc_message msg = {
4041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4042                 .rpc_argp = &setclientid,
4043                 .rpc_resp = res,
4044                 .rpc_cred = cred,
4045         };
4046         int status;
4047
4048         /* nfs_client_id4 */
4049         nfs4_init_boot_verifier(clp, &sc_verifier);
4050         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4051                 setclientid.sc_name_len =
4052                                 nfs4_init_uniform_client_string(clp,
4053                                                 setclientid.sc_name,
4054                                                 sizeof(setclientid.sc_name));
4055         else
4056                 setclientid.sc_name_len =
4057                                 nfs4_init_nonuniform_client_string(clp,
4058                                                 setclientid.sc_name,
4059                                                 sizeof(setclientid.sc_name));
4060         /* cb_client4 */
4061         rcu_read_lock();
4062         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4063                                 sizeof(setclientid.sc_netid),
4064                                 rpc_peeraddr2str(clp->cl_rpcclient,
4065                                                         RPC_DISPLAY_NETID));
4066         rcu_read_unlock();
4067         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4068                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4069                                 clp->cl_ipaddr, port >> 8, port & 255);
4070
4071         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4072                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4073                 setclientid.sc_name_len, setclientid.sc_name);
4074         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4075         dprintk("NFS reply setclientid: %d\n", status);
4076         return status;
4077 }
4078
4079 /**
4080  * nfs4_proc_setclientid_confirm - Confirm client ID
4081  * @clp: state data structure
4082  * @res: result of a previous SETCLIENTID
4083  * @cred: RPC credential to use for this call
4084  *
4085  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4086  */
4087 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4088                 struct nfs4_setclientid_res *arg,
4089                 struct rpc_cred *cred)
4090 {
4091         struct nfs_fsinfo fsinfo;
4092         struct rpc_message msg = {
4093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4094                 .rpc_argp = arg,
4095                 .rpc_resp = &fsinfo,
4096                 .rpc_cred = cred,
4097         };
4098         unsigned long now;
4099         int status;
4100
4101         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4102                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4103                 clp->cl_clientid);
4104         now = jiffies;
4105         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4106         if (status == 0) {
4107                 spin_lock(&clp->cl_lock);
4108                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4109                 clp->cl_last_renewal = now;
4110                 spin_unlock(&clp->cl_lock);
4111         }
4112         dprintk("NFS reply setclientid_confirm: %d\n", status);
4113         return status;
4114 }
4115
4116 struct nfs4_delegreturndata {
4117         struct nfs4_delegreturnargs args;
4118         struct nfs4_delegreturnres res;
4119         struct nfs_fh fh;
4120         nfs4_stateid stateid;
4121         unsigned long timestamp;
4122         struct nfs_fattr fattr;
4123         int rpc_status;
4124 };
4125
4126 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4127 {
4128         struct nfs4_delegreturndata *data = calldata;
4129
4130         if (!nfs4_sequence_done(task, &data->res.seq_res))
4131                 return;
4132
4133         switch (task->tk_status) {
4134         case -NFS4ERR_STALE_STATEID:
4135         case -NFS4ERR_EXPIRED:
4136         case 0:
4137                 renew_lease(data->res.server, data->timestamp);
4138                 break;
4139         default:
4140                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4141                                 -EAGAIN) {
4142                         rpc_restart_call_prepare(task);
4143                         return;
4144                 }
4145         }
4146         data->rpc_status = task->tk_status;
4147 }
4148
4149 static void nfs4_delegreturn_release(void *calldata)
4150 {
4151         kfree(calldata);
4152 }
4153
4154 #if defined(CONFIG_NFS_V4_1)
4155 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4156 {
4157         struct nfs4_delegreturndata *d_data;
4158
4159         d_data = (struct nfs4_delegreturndata *)data;
4160
4161         nfs4_setup_sequence(d_data->res.server,
4162                         &d_data->args.seq_args,
4163                         &d_data->res.seq_res,
4164                         task);
4165 }
4166 #endif /* CONFIG_NFS_V4_1 */
4167
4168 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4169 #if defined(CONFIG_NFS_V4_1)
4170         .rpc_call_prepare = nfs4_delegreturn_prepare,
4171 #endif /* CONFIG_NFS_V4_1 */
4172         .rpc_call_done = nfs4_delegreturn_done,
4173         .rpc_release = nfs4_delegreturn_release,
4174 };
4175
4176 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4177 {
4178         struct nfs4_delegreturndata *data;
4179         struct nfs_server *server = NFS_SERVER(inode);
4180         struct rpc_task *task;
4181         struct rpc_message msg = {
4182                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4183                 .rpc_cred = cred,
4184         };
4185         struct rpc_task_setup task_setup_data = {
4186                 .rpc_client = server->client,
4187                 .rpc_message = &msg,
4188                 .callback_ops = &nfs4_delegreturn_ops,
4189                 .flags = RPC_TASK_ASYNC,
4190         };
4191         int status = 0;
4192
4193         data = kzalloc(sizeof(*data), GFP_NOFS);
4194         if (data == NULL)
4195                 return -ENOMEM;
4196         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4197         data->args.fhandle = &data->fh;
4198         data->args.stateid = &data->stateid;
4199         data->args.bitmask = server->cache_consistency_bitmask;
4200         nfs_copy_fh(&data->fh, NFS_FH(inode));
4201         nfs4_stateid_copy(&data->stateid, stateid);
4202         data->res.fattr = &data->fattr;
4203         data->res.server = server;
4204         nfs_fattr_init(data->res.fattr);
4205         data->timestamp = jiffies;
4206         data->rpc_status = 0;
4207
4208         task_setup_data.callback_data = data;
4209         msg.rpc_argp = &data->args;
4210         msg.rpc_resp = &data->res;
4211         task = rpc_run_task(&task_setup_data);
4212         if (IS_ERR(task))
4213                 return PTR_ERR(task);
4214         if (!issync)
4215                 goto out;
4216         status = nfs4_wait_for_completion_rpc_task(task);
4217         if (status != 0)
4218                 goto out;
4219         status = data->rpc_status;
4220         if (status == 0)
4221                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4222         else
4223                 nfs_refresh_inode(inode, &data->fattr);
4224 out:
4225         rpc_put_task(task);
4226         return status;
4227 }
4228
4229 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4230 {
4231         struct nfs_server *server = NFS_SERVER(inode);
4232         struct nfs4_exception exception = { };
4233         int err;
4234         do {
4235                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4236                 switch (err) {
4237                         case -NFS4ERR_STALE_STATEID:
4238                         case -NFS4ERR_EXPIRED:
4239                         case 0:
4240                                 return 0;
4241                 }
4242                 err = nfs4_handle_exception(server, err, &exception);
4243         } while (exception.retry);
4244         return err;
4245 }
4246
4247 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4248 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4249
4250 /*
4251  * sleep, with exponential backoff, and retry the LOCK operation.
4252  */
4253 static unsigned long
4254 nfs4_set_lock_task_retry(unsigned long timeout)
4255 {
4256         freezable_schedule_timeout_killable(timeout);
4257         timeout <<= 1;
4258         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4259                 return NFS4_LOCK_MAXTIMEOUT;
4260         return timeout;
4261 }
4262
4263 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4264 {
4265         struct inode *inode = state->inode;
4266         struct nfs_server *server = NFS_SERVER(inode);
4267         struct nfs_client *clp = server->nfs_client;
4268         struct nfs_lockt_args arg = {
4269                 .fh = NFS_FH(inode),
4270                 .fl = request,
4271         };
4272         struct nfs_lockt_res res = {
4273                 .denied = request,
4274         };
4275         struct rpc_message msg = {
4276                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4277                 .rpc_argp       = &arg,
4278                 .rpc_resp       = &res,
4279                 .rpc_cred       = state->owner->so_cred,
4280         };
4281         struct nfs4_lock_state *lsp;
4282         int status;
4283
4284         arg.lock_owner.clientid = clp->cl_clientid;
4285         status = nfs4_set_lock_state(state, request);
4286         if (status != 0)
4287                 goto out;
4288         lsp = request->fl_u.nfs4_fl.owner;
4289         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4290         arg.lock_owner.s_dev = server->s_dev;
4291         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4292         switch (status) {
4293                 case 0:
4294                         request->fl_type = F_UNLCK;
4295                         break;
4296                 case -NFS4ERR_DENIED:
4297                         status = 0;
4298         }
4299         request->fl_ops->fl_release_private(request);
4300 out:
4301         return status;
4302 }
4303
4304 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4305 {
4306         struct nfs4_exception exception = { };
4307         int err;
4308
4309         do {
4310                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4311                                 _nfs4_proc_getlk(state, cmd, request),
4312                                 &exception);
4313         } while (exception.retry);
4314         return err;
4315 }
4316
4317 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4318 {
4319         int res = 0;
4320         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4321                 case FL_POSIX:
4322                         res = posix_lock_file_wait(file, fl);
4323                         break;
4324                 case FL_FLOCK:
4325                         res = flock_lock_file_wait(file, fl);
4326                         break;
4327                 default:
4328                         BUG();
4329         }
4330         return res;
4331 }
4332
4333 struct nfs4_unlockdata {
4334         struct nfs_locku_args arg;
4335         struct nfs_locku_res res;
4336         struct nfs4_lock_state *lsp;
4337         struct nfs_open_context *ctx;
4338         struct file_lock fl;
4339         const struct nfs_server *server;
4340         unsigned long timestamp;
4341 };
4342
4343 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4344                 struct nfs_open_context *ctx,
4345                 struct nfs4_lock_state *lsp,
4346                 struct nfs_seqid *seqid)
4347 {
4348         struct nfs4_unlockdata *p;
4349         struct inode *inode = lsp->ls_state->inode;
4350
4351         p = kzalloc(sizeof(*p), GFP_NOFS);
4352         if (p == NULL)
4353                 return NULL;
4354         p->arg.fh = NFS_FH(inode);
4355         p->arg.fl = &p->fl;
4356         p->arg.seqid = seqid;
4357         p->res.seqid = seqid;
4358         p->arg.stateid = &lsp->ls_stateid;
4359         p->lsp = lsp;
4360         atomic_inc(&lsp->ls_count);
4361         /* Ensure we don't close file until we're done freeing locks! */
4362         p->ctx = get_nfs_open_context(ctx);
4363         memcpy(&p->fl, fl, sizeof(p->fl));
4364         p->server = NFS_SERVER(inode);
4365         return p;
4366 }
4367
4368 static void nfs4_locku_release_calldata(void *data)
4369 {
4370         struct nfs4_unlockdata *calldata = data;
4371         nfs_free_seqid(calldata->arg.seqid);
4372         nfs4_put_lock_state(calldata->lsp);
4373         put_nfs_open_context(calldata->ctx);
4374         kfree(calldata);
4375 }
4376
4377 static void nfs4_locku_done(struct rpc_task *task, void *data)
4378 {
4379         struct nfs4_unlockdata *calldata = data;
4380
4381         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4382                 return;
4383         switch (task->tk_status) {
4384                 case 0:
4385                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4386                                         &calldata->res.stateid);
4387                         renew_lease(calldata->server, calldata->timestamp);
4388                         break;
4389                 case -NFS4ERR_BAD_STATEID:
4390                 case -NFS4ERR_OLD_STATEID:
4391                 case -NFS4ERR_STALE_STATEID:
4392                 case -NFS4ERR_EXPIRED:
4393                         break;
4394                 default:
4395                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4396                                 rpc_restart_call_prepare(task);
4397         }
4398         nfs_release_seqid(calldata->arg.seqid);
4399 }
4400
4401 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4402 {
4403         struct nfs4_unlockdata *calldata = data;
4404
4405         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4406                 return;
4407         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4408                 /* Note: exit _without_ running nfs4_locku_done */
4409                 task->tk_action = NULL;
4410                 return;
4411         }
4412         calldata->timestamp = jiffies;
4413         if (nfs4_setup_sequence(calldata->server,
4414                                 &calldata->arg.seq_args,
4415                                 &calldata->res.seq_res,
4416                                 task) != 0)
4417                 nfs_release_seqid(calldata->arg.seqid);
4418 }
4419
4420 static const struct rpc_call_ops nfs4_locku_ops = {
4421         .rpc_call_prepare = nfs4_locku_prepare,
4422         .rpc_call_done = nfs4_locku_done,
4423         .rpc_release = nfs4_locku_release_calldata,
4424 };
4425
4426 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4427                 struct nfs_open_context *ctx,
4428                 struct nfs4_lock_state *lsp,
4429                 struct nfs_seqid *seqid)
4430 {
4431         struct nfs4_unlockdata *data;
4432         struct rpc_message msg = {
4433                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4434                 .rpc_cred = ctx->cred,
4435         };
4436         struct rpc_task_setup task_setup_data = {
4437                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4438                 .rpc_message = &msg,
4439                 .callback_ops = &nfs4_locku_ops,
4440                 .workqueue = nfsiod_workqueue,
4441                 .flags = RPC_TASK_ASYNC,
4442         };
4443
4444         /* Ensure this is an unlock - when canceling a lock, the
4445          * canceled lock is passed in, and it won't be an unlock.
4446          */
4447         fl->fl_type = F_UNLCK;
4448
4449         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4450         if (data == NULL) {
4451                 nfs_free_seqid(seqid);
4452                 return ERR_PTR(-ENOMEM);
4453         }
4454
4455         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4456         msg.rpc_argp = &data->arg;
4457         msg.rpc_resp = &data->res;
4458         task_setup_data.callback_data = data;
4459         return rpc_run_task(&task_setup_data);
4460 }
4461
4462 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4463 {
4464         struct nfs_inode *nfsi = NFS_I(state->inode);
4465         struct nfs_seqid *seqid;
4466         struct nfs4_lock_state *lsp;
4467         struct rpc_task *task;
4468         int status = 0;
4469         unsigned char fl_flags = request->fl_flags;
4470
4471         status = nfs4_set_lock_state(state, request);
4472         /* Unlock _before_ we do the RPC call */
4473         request->fl_flags |= FL_EXISTS;
4474         down_read(&nfsi->rwsem);
4475         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4476                 up_read(&nfsi->rwsem);
4477                 goto out;
4478         }
4479         up_read(&nfsi->rwsem);
4480         if (status != 0)
4481                 goto out;
4482         /* Is this a delegated lock? */
4483         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4484                 goto out;
4485         lsp = request->fl_u.nfs4_fl.owner;
4486         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4487         status = -ENOMEM;
4488         if (seqid == NULL)
4489                 goto out;
4490         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4491         status = PTR_ERR(task);
4492         if (IS_ERR(task))
4493                 goto out;
4494         status = nfs4_wait_for_completion_rpc_task(task);
4495         rpc_put_task(task);
4496 out:
4497         request->fl_flags = fl_flags;
4498         return status;
4499 }
4500
4501 struct nfs4_lockdata {
4502         struct nfs_lock_args arg;
4503         struct nfs_lock_res res;
4504         struct nfs4_lock_state *lsp;
4505         struct nfs_open_context *ctx;
4506         struct file_lock fl;
4507         unsigned long timestamp;
4508         int rpc_status;
4509         int cancelled;
4510         struct nfs_server *server;
4511 };
4512
4513 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4514                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4515                 gfp_t gfp_mask)
4516 {
4517         struct nfs4_lockdata *p;
4518         struct inode *inode = lsp->ls_state->inode;
4519         struct nfs_server *server = NFS_SERVER(inode);
4520
4521         p = kzalloc(sizeof(*p), gfp_mask);
4522         if (p == NULL)
4523                 return NULL;
4524
4525         p->arg.fh = NFS_FH(inode);
4526         p->arg.fl = &p->fl;
4527         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4528         if (p->arg.open_seqid == NULL)
4529                 goto out_free;
4530         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4531         if (p->arg.lock_seqid == NULL)
4532                 goto out_free_seqid;
4533         p->arg.lock_stateid = &lsp->ls_stateid;
4534         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4535         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4536         p->arg.lock_owner.s_dev = server->s_dev;
4537         p->res.lock_seqid = p->arg.lock_seqid;
4538         p->lsp = lsp;
4539         p->server = server;
4540         atomic_inc(&lsp->ls_count);
4541         p->ctx = get_nfs_open_context(ctx);
4542         memcpy(&p->fl, fl, sizeof(p->fl));
4543         return p;
4544 out_free_seqid:
4545         nfs_free_seqid(p->arg.open_seqid);
4546 out_free:
4547         kfree(p);
4548         return NULL;
4549 }
4550
4551 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4552 {
4553         struct nfs4_lockdata *data = calldata;
4554         struct nfs4_state *state = data->lsp->ls_state;
4555
4556         dprintk("%s: begin!\n", __func__);
4557         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4558                 return;
4559         /* Do we need to do an open_to_lock_owner? */
4560         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4561                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4562                         goto out_release_lock_seqid;
4563                 data->arg.open_stateid = &state->stateid;
4564                 data->arg.new_lock_owner = 1;
4565                 data->res.open_seqid = data->arg.open_seqid;
4566         } else
4567                 data->arg.new_lock_owner = 0;
4568         data->timestamp = jiffies;
4569         if (nfs4_setup_sequence(data->server,
4570                                 &data->arg.seq_args,
4571                                 &data->res.seq_res,
4572                                 task) == 0)
4573                 return;
4574         nfs_release_seqid(data->arg.open_seqid);
4575 out_release_lock_seqid:
4576         nfs_release_seqid(data->arg.lock_seqid);
4577         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4578 }
4579
4580 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4581 {
4582         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4583         nfs4_lock_prepare(task, calldata);
4584 }
4585
4586 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4587 {
4588         struct nfs4_lockdata *data = calldata;
4589
4590         dprintk("%s: begin!\n", __func__);
4591
4592         if (!nfs4_sequence_done(task, &data->res.seq_res))
4593                 return;
4594
4595         data->rpc_status = task->tk_status;
4596         if (data->arg.new_lock_owner != 0) {
4597                 if (data->rpc_status == 0)
4598                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4599                 else
4600                         goto out;
4601         }
4602         if (data->rpc_status == 0) {
4603                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4604                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4605                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4606         }
4607 out:
4608         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4609 }
4610
4611 static void nfs4_lock_release(void *calldata)
4612 {
4613         struct nfs4_lockdata *data = calldata;
4614
4615         dprintk("%s: begin!\n", __func__);
4616         nfs_free_seqid(data->arg.open_seqid);
4617         if (data->cancelled != 0) {
4618                 struct rpc_task *task;
4619                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4620                                 data->arg.lock_seqid);
4621                 if (!IS_ERR(task))
4622                         rpc_put_task_async(task);
4623                 dprintk("%s: cancelling lock!\n", __func__);
4624         } else
4625                 nfs_free_seqid(data->arg.lock_seqid);
4626         nfs4_put_lock_state(data->lsp);
4627         put_nfs_open_context(data->ctx);
4628         kfree(data);
4629         dprintk("%s: done!\n", __func__);
4630 }
4631
4632 static const struct rpc_call_ops nfs4_lock_ops = {
4633         .rpc_call_prepare = nfs4_lock_prepare,
4634         .rpc_call_done = nfs4_lock_done,
4635         .rpc_release = nfs4_lock_release,
4636 };
4637
4638 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4639         .rpc_call_prepare = nfs4_recover_lock_prepare,
4640         .rpc_call_done = nfs4_lock_done,
4641         .rpc_release = nfs4_lock_release,
4642 };
4643
4644 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4645 {
4646         switch (error) {
4647         case -NFS4ERR_ADMIN_REVOKED:
4648         case -NFS4ERR_BAD_STATEID:
4649                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4650                 if (new_lock_owner != 0 ||
4651                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4652                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4653                 break;
4654         case -NFS4ERR_STALE_STATEID:
4655                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4656         case -NFS4ERR_EXPIRED:
4657                 nfs4_schedule_lease_recovery(server->nfs_client);
4658         };
4659 }
4660
4661 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4662 {
4663         struct nfs4_lockdata *data;
4664         struct rpc_task *task;
4665         struct rpc_message msg = {
4666                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4667                 .rpc_cred = state->owner->so_cred,
4668         };
4669         struct rpc_task_setup task_setup_data = {
4670                 .rpc_client = NFS_CLIENT(state->inode),
4671                 .rpc_message = &msg,
4672                 .callback_ops = &nfs4_lock_ops,
4673                 .workqueue = nfsiod_workqueue,
4674                 .flags = RPC_TASK_ASYNC,
4675         };
4676         int ret;
4677
4678         dprintk("%s: begin!\n", __func__);
4679         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4680                         fl->fl_u.nfs4_fl.owner,
4681                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4682         if (data == NULL)
4683                 return -ENOMEM;
4684         if (IS_SETLKW(cmd))
4685                 data->arg.block = 1;
4686         if (recovery_type > NFS_LOCK_NEW) {
4687                 if (recovery_type == NFS_LOCK_RECLAIM)
4688                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4689                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4690         }
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         task = rpc_run_task(&task_setup_data);
4696         if (IS_ERR(task))
4697                 return PTR_ERR(task);
4698         ret = nfs4_wait_for_completion_rpc_task(task);
4699         if (ret == 0) {
4700                 ret = data->rpc_status;
4701                 if (ret)
4702                         nfs4_handle_setlk_error(data->server, data->lsp,
4703                                         data->arg.new_lock_owner, ret);
4704         } else
4705                 data->cancelled = 1;
4706         rpc_put_task(task);
4707         dprintk("%s: done, ret = %d!\n", __func__, ret);
4708         return ret;
4709 }
4710
4711 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4712 {
4713         struct nfs_server *server = NFS_SERVER(state->inode);
4714         struct nfs4_exception exception = {
4715                 .inode = state->inode,
4716         };
4717         int err;
4718
4719         do {
4720                 /* Cache the lock if possible... */
4721                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4722                         return 0;
4723                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4724                 if (err != -NFS4ERR_DELAY)
4725                         break;
4726                 nfs4_handle_exception(server, err, &exception);
4727         } while (exception.retry);
4728         return err;
4729 }
4730
4731 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4732 {
4733         struct nfs_server *server = NFS_SERVER(state->inode);
4734         struct nfs4_exception exception = {
4735                 .inode = state->inode,
4736         };
4737         int err;
4738
4739         err = nfs4_set_lock_state(state, request);
4740         if (err != 0)
4741                 return err;
4742         do {
4743                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4744                         return 0;
4745                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4746                 switch (err) {
4747                 default:
4748                         goto out;
4749                 case -NFS4ERR_GRACE:
4750                 case -NFS4ERR_DELAY:
4751                         nfs4_handle_exception(server, err, &exception);
4752                         err = 0;
4753                 }
4754         } while (exception.retry);
4755 out:
4756         return err;
4757 }
4758
4759 #if defined(CONFIG_NFS_V4_1)
4760 /**
4761  * nfs41_check_expired_locks - possibly free a lock stateid
4762  *
4763  * @state: NFSv4 state for an inode
4764  *
4765  * Returns NFS_OK if recovery for this stateid is now finished.
4766  * Otherwise a negative NFS4ERR value is returned.
4767  */
4768 static int nfs41_check_expired_locks(struct nfs4_state *state)
4769 {
4770         int status, ret = -NFS4ERR_BAD_STATEID;
4771         struct nfs4_lock_state *lsp;
4772         struct nfs_server *server = NFS_SERVER(state->inode);
4773
4774         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4775                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4776                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4777                         if (status != NFS_OK) {
4778                                 /* Free the stateid unless the server
4779                                  * informs us the stateid is unrecognized. */
4780                                 if (status != -NFS4ERR_BAD_STATEID)
4781                                         nfs41_free_stateid(server,
4782                                                         &lsp->ls_stateid);
4783                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4784                                 ret = status;
4785                         }
4786                 }
4787         };
4788
4789         return ret;
4790 }
4791
4792 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4793 {
4794         int status = NFS_OK;
4795
4796         if (test_bit(LK_STATE_IN_USE, &state->flags))
4797                 status = nfs41_check_expired_locks(state);
4798         if (status != NFS_OK)
4799                 status = nfs4_lock_expired(state, request);
4800         return status;
4801 }
4802 #endif
4803
4804 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4805 {
4806         struct nfs_inode *nfsi = NFS_I(state->inode);
4807         unsigned char fl_flags = request->fl_flags;
4808         int status = -ENOLCK;
4809
4810         if ((fl_flags & FL_POSIX) &&
4811                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4812                 goto out;
4813         /* Is this a delegated open? */
4814         status = nfs4_set_lock_state(state, request);
4815         if (status != 0)
4816                 goto out;
4817         request->fl_flags |= FL_ACCESS;
4818         status = do_vfs_lock(request->fl_file, request);
4819         if (status < 0)
4820                 goto out;
4821         down_read(&nfsi->rwsem);
4822         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4823                 /* Yes: cache locks! */
4824                 /* ...but avoid races with delegation recall... */
4825                 request->fl_flags = fl_flags & ~FL_SLEEP;
4826                 status = do_vfs_lock(request->fl_file, request);
4827                 goto out_unlock;
4828         }
4829         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4830         if (status != 0)
4831                 goto out_unlock;
4832         /* Note: we always want to sleep here! */
4833         request->fl_flags = fl_flags | FL_SLEEP;
4834         if (do_vfs_lock(request->fl_file, request) < 0)
4835                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4836                         "manager!\n", __func__);
4837 out_unlock:
4838         up_read(&nfsi->rwsem);
4839 out:
4840         request->fl_flags = fl_flags;
4841         return status;
4842 }
4843
4844 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4845 {
4846         struct nfs4_exception exception = {
4847                 .state = state,
4848                 .inode = state->inode,
4849         };
4850         int err;
4851
4852         do {
4853                 err = _nfs4_proc_setlk(state, cmd, request);
4854                 if (err == -NFS4ERR_DENIED)
4855                         err = -EAGAIN;
4856                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4857                                 err, &exception);
4858         } while (exception.retry);
4859         return err;
4860 }
4861
4862 static int
4863 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4864 {
4865         struct nfs_open_context *ctx;
4866         struct nfs4_state *state;
4867         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4868         int status;
4869
4870         /* verify open state */
4871         ctx = nfs_file_open_context(filp);
4872         state = ctx->state;
4873
4874         if (request->fl_start < 0 || request->fl_end < 0)
4875                 return -EINVAL;
4876
4877         if (IS_GETLK(cmd)) {
4878                 if (state != NULL)
4879                         return nfs4_proc_getlk(state, F_GETLK, request);
4880                 return 0;
4881         }
4882
4883         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4884                 return -EINVAL;
4885
4886         if (request->fl_type == F_UNLCK) {
4887                 if (state != NULL)
4888                         return nfs4_proc_unlck(state, cmd, request);
4889                 return 0;
4890         }
4891
4892         if (state == NULL)
4893                 return -ENOLCK;
4894         /*
4895          * Don't rely on the VFS having checked the file open mode,
4896          * since it won't do this for flock() locks.
4897          */
4898         switch (request->fl_type) {
4899         case F_RDLCK:
4900                 if (!(filp->f_mode & FMODE_READ))
4901                         return -EBADF;
4902                 break;
4903         case F_WRLCK:
4904                 if (!(filp->f_mode & FMODE_WRITE))
4905                         return -EBADF;
4906         }
4907
4908         do {
4909                 status = nfs4_proc_setlk(state, cmd, request);
4910                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4911                         break;
4912                 timeout = nfs4_set_lock_task_retry(timeout);
4913                 status = -ERESTARTSYS;
4914                 if (signalled())
4915                         break;
4916         } while(status < 0);
4917         return status;
4918 }
4919
4920 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4921 {
4922         struct nfs_server *server = NFS_SERVER(state->inode);
4923         struct nfs4_exception exception = { };
4924         int err;
4925
4926         err = nfs4_set_lock_state(state, fl);
4927         if (err != 0)
4928                 goto out;
4929         do {
4930                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4931                 switch (err) {
4932                         default:
4933                                 printk(KERN_ERR "NFS: %s: unhandled error "
4934                                         "%d.\n", __func__, err);
4935                         case 0:
4936                         case -ESTALE:
4937                                 goto out;
4938                         case -NFS4ERR_EXPIRED:
4939                                 nfs4_schedule_stateid_recovery(server, state);
4940                         case -NFS4ERR_STALE_CLIENTID:
4941                         case -NFS4ERR_STALE_STATEID:
4942                                 nfs4_schedule_lease_recovery(server->nfs_client);
4943                                 goto out;
4944                         case -NFS4ERR_BADSESSION:
4945                         case -NFS4ERR_BADSLOT:
4946                         case -NFS4ERR_BAD_HIGH_SLOT:
4947                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4948                         case -NFS4ERR_DEADSESSION:
4949                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4950                                 goto out;
4951                         case -ERESTARTSYS:
4952                                 /*
4953                                  * The show must go on: exit, but mark the
4954                                  * stateid as needing recovery.
4955                                  */
4956                         case -NFS4ERR_DELEG_REVOKED:
4957                         case -NFS4ERR_ADMIN_REVOKED:
4958                         case -NFS4ERR_BAD_STATEID:
4959                         case -NFS4ERR_OPENMODE:
4960                                 nfs4_schedule_stateid_recovery(server, state);
4961                                 err = 0;
4962                                 goto out;
4963                         case -EKEYEXPIRED:
4964                                 /*
4965                                  * User RPCSEC_GSS context has expired.
4966                                  * We cannot recover this stateid now, so
4967                                  * skip it and allow recovery thread to
4968                                  * proceed.
4969                                  */
4970                                 err = 0;
4971                                 goto out;
4972                         case -ENOMEM:
4973                         case -NFS4ERR_DENIED:
4974                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4975                                 err = 0;
4976                                 goto out;
4977                         case -NFS4ERR_DELAY:
4978                                 break;
4979                 }
4980                 err = nfs4_handle_exception(server, err, &exception);
4981         } while (exception.retry);
4982 out:
4983         return err;
4984 }
4985
4986 struct nfs_release_lockowner_data {
4987         struct nfs4_lock_state *lsp;
4988         struct nfs_server *server;
4989         struct nfs_release_lockowner_args args;
4990 };
4991
4992 static void nfs4_release_lockowner_release(void *calldata)
4993 {
4994         struct nfs_release_lockowner_data *data = calldata;
4995         nfs4_free_lock_state(data->server, data->lsp);
4996         kfree(calldata);
4997 }
4998
4999 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5000         .rpc_release = nfs4_release_lockowner_release,
5001 };
5002
5003 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5004 {
5005         struct nfs_server *server = lsp->ls_state->owner->so_server;
5006         struct nfs_release_lockowner_data *data;
5007         struct rpc_message msg = {
5008                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5009         };
5010
5011         if (server->nfs_client->cl_mvops->minor_version != 0)
5012                 return -EINVAL;
5013         data = kmalloc(sizeof(*data), GFP_NOFS);
5014         if (!data)
5015                 return -ENOMEM;
5016         data->lsp = lsp;
5017         data->server = server;
5018         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5019         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5020         data->args.lock_owner.s_dev = server->s_dev;
5021         msg.rpc_argp = &data->args;
5022         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5023         return 0;
5024 }
5025
5026 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5027
5028 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5029                                    const void *buf, size_t buflen,
5030                                    int flags, int type)
5031 {
5032         if (strcmp(key, "") != 0)
5033                 return -EINVAL;
5034
5035         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5036 }
5037
5038 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5039                                    void *buf, size_t buflen, int type)
5040 {
5041         if (strcmp(key, "") != 0)
5042                 return -EINVAL;
5043
5044         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5045 }
5046
5047 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5048                                        size_t list_len, const char *name,
5049                                        size_t name_len, int type)
5050 {
5051         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5052
5053         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5054                 return 0;
5055
5056         if (list && len <= list_len)
5057                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5058         return len;
5059 }
5060
5061 /*
5062  * nfs_fhget will use either the mounted_on_fileid or the fileid
5063  */
5064 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5065 {
5066         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5067                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5068               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5069               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5070                 return;
5071
5072         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5073                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5074         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5075         fattr->nlink = 2;
5076 }
5077
5078 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5079                                    const struct qstr *name,
5080                                    struct nfs4_fs_locations *fs_locations,
5081                                    struct page *page)
5082 {
5083         struct nfs_server *server = NFS_SERVER(dir);
5084         u32 bitmask[2] = {
5085                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5086         };
5087         struct nfs4_fs_locations_arg args = {
5088                 .dir_fh = NFS_FH(dir),
5089                 .name = name,
5090                 .page = page,
5091                 .bitmask = bitmask,
5092         };
5093         struct nfs4_fs_locations_res res = {
5094                 .fs_locations = fs_locations,
5095         };
5096         struct rpc_message msg = {
5097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5098                 .rpc_argp = &args,
5099                 .rpc_resp = &res,
5100         };
5101         int status;
5102
5103         dprintk("%s: start\n", __func__);
5104
5105         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5106          * is not supported */
5107         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5108                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5109         else
5110                 bitmask[0] |= FATTR4_WORD0_FILEID;
5111
5112         nfs_fattr_init(&fs_locations->fattr);
5113         fs_locations->server = server;
5114         fs_locations->nlocations = 0;
5115         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5116         dprintk("%s: returned status = %d\n", __func__, status);
5117         return status;
5118 }
5119
5120 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5121                            const struct qstr *name,
5122                            struct nfs4_fs_locations *fs_locations,
5123                            struct page *page)
5124 {
5125         struct nfs4_exception exception = { };
5126         int err;
5127         do {
5128                 err = nfs4_handle_exception(NFS_SERVER(dir),
5129                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5130                                 &exception);
5131         } while (exception.retry);
5132         return err;
5133 }
5134
5135 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5136 {
5137         int status;
5138         struct nfs4_secinfo_arg args = {
5139                 .dir_fh = NFS_FH(dir),
5140                 .name   = name,
5141         };
5142         struct nfs4_secinfo_res res = {
5143                 .flavors     = flavors,
5144         };
5145         struct rpc_message msg = {
5146                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5147                 .rpc_argp = &args,
5148                 .rpc_resp = &res,
5149         };
5150
5151         dprintk("NFS call  secinfo %s\n", name->name);
5152         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5153         dprintk("NFS reply  secinfo: %d\n", status);
5154         return status;
5155 }
5156
5157 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5158                       struct nfs4_secinfo_flavors *flavors)
5159 {
5160         struct nfs4_exception exception = { };
5161         int err;
5162         do {
5163                 err = nfs4_handle_exception(NFS_SERVER(dir),
5164                                 _nfs4_proc_secinfo(dir, name, flavors),
5165                                 &exception);
5166         } while (exception.retry);
5167         return err;
5168 }
5169
5170 #ifdef CONFIG_NFS_V4_1
5171 /*
5172  * Check the exchange flags returned by the server for invalid flags, having
5173  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5174  * DS flags set.
5175  */
5176 static int nfs4_check_cl_exchange_flags(u32 flags)
5177 {
5178         if (flags & ~EXCHGID4_FLAG_MASK_R)
5179                 goto out_inval;
5180         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5181             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5182                 goto out_inval;
5183         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5184                 goto out_inval;
5185         return NFS_OK;
5186 out_inval:
5187         return -NFS4ERR_INVAL;
5188 }
5189
5190 static bool
5191 nfs41_same_server_scope(struct nfs41_server_scope *a,
5192                         struct nfs41_server_scope *b)
5193 {
5194         if (a->server_scope_sz == b->server_scope_sz &&
5195             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5196                 return true;
5197
5198         return false;
5199 }
5200
5201 /*
5202  * nfs4_proc_bind_conn_to_session()
5203  *
5204  * The 4.1 client currently uses the same TCP connection for the
5205  * fore and backchannel.
5206  */
5207 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5208 {
5209         int status;
5210         struct nfs41_bind_conn_to_session_res res;
5211         struct rpc_message msg = {
5212                 .rpc_proc =
5213                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5214                 .rpc_argp = clp,
5215                 .rpc_resp = &res,
5216                 .rpc_cred = cred,
5217         };
5218
5219         dprintk("--> %s\n", __func__);
5220
5221         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5222         if (unlikely(res.session == NULL)) {
5223                 status = -ENOMEM;
5224                 goto out;
5225         }
5226
5227         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5228         if (status == 0) {
5229                 if (memcmp(res.session->sess_id.data,
5230                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5231                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5232                         status = -EIO;
5233                         goto out_session;
5234                 }
5235                 if (res.dir != NFS4_CDFS4_BOTH) {
5236                         dprintk("NFS: %s: Unexpected direction from server\n",
5237                                 __func__);
5238                         status = -EIO;
5239                         goto out_session;
5240                 }
5241                 if (res.use_conn_in_rdma_mode) {
5242                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5243                                 __func__);
5244                         status = -EIO;
5245                         goto out_session;
5246                 }
5247         }
5248 out_session:
5249         kfree(res.session);
5250 out:
5251         dprintk("<-- %s status= %d\n", __func__, status);
5252         return status;
5253 }
5254
5255 /*
5256  * nfs4_proc_exchange_id()
5257  *
5258  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5259  *
5260  * Since the clientid has expired, all compounds using sessions
5261  * associated with the stale clientid will be returning
5262  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5263  * be in some phase of session reset.
5264  */
5265 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5266 {
5267         nfs4_verifier verifier;
5268         struct nfs41_exchange_id_args args = {
5269                 .verifier = &verifier,
5270                 .client = clp,
5271                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5272         };
5273         struct nfs41_exchange_id_res res = {
5274                 0
5275         };
5276         int status;
5277         struct rpc_message msg = {
5278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5279                 .rpc_argp = &args,
5280                 .rpc_resp = &res,
5281                 .rpc_cred = cred,
5282         };
5283
5284         nfs4_init_boot_verifier(clp, &verifier);
5285         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5286                                                         sizeof(args.id));
5287         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5288                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5289                 args.id_len, args.id);
5290
5291         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5292                                         GFP_NOFS);
5293         if (unlikely(res.server_owner == NULL)) {
5294                 status = -ENOMEM;
5295                 goto out;
5296         }
5297
5298         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5299                                         GFP_NOFS);
5300         if (unlikely(res.server_scope == NULL)) {
5301                 status = -ENOMEM;
5302                 goto out_server_owner;
5303         }
5304
5305         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5306         if (unlikely(res.impl_id == NULL)) {
5307                 status = -ENOMEM;
5308                 goto out_server_scope;
5309         }
5310
5311         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5312         if (status == 0)
5313                 status = nfs4_check_cl_exchange_flags(res.flags);
5314
5315         if (status == 0) {
5316                 clp->cl_clientid = res.clientid;
5317                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5318                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5319                         clp->cl_seqid = res.seqid;
5320
5321                 kfree(clp->cl_serverowner);
5322                 clp->cl_serverowner = res.server_owner;
5323                 res.server_owner = NULL;
5324
5325                 /* use the most recent implementation id */
5326                 kfree(clp->cl_implid);
5327                 clp->cl_implid = res.impl_id;
5328
5329                 if (clp->cl_serverscope != NULL &&
5330                     !nfs41_same_server_scope(clp->cl_serverscope,
5331                                              res.server_scope)) {
5332                         dprintk("%s: server_scope mismatch detected\n",
5333                                 __func__);
5334                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5335                         kfree(clp->cl_serverscope);
5336                         clp->cl_serverscope = NULL;
5337                 }
5338
5339                 if (clp->cl_serverscope == NULL) {
5340                         clp->cl_serverscope = res.server_scope;
5341                         goto out;
5342                 }
5343         } else
5344                 kfree(res.impl_id);
5345
5346 out_server_owner:
5347         kfree(res.server_owner);
5348 out_server_scope:
5349         kfree(res.server_scope);
5350 out:
5351         if (clp->cl_implid != NULL)
5352                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5353                         "domain: %s, name: %s, date: %llu,%u\n",
5354                         clp->cl_implid->domain, clp->cl_implid->name,
5355                         clp->cl_implid->date.seconds,
5356                         clp->cl_implid->date.nseconds);
5357         dprintk("NFS reply exchange_id: %d\n", status);
5358         return status;
5359 }
5360
5361 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5362                 struct rpc_cred *cred)
5363 {
5364         struct rpc_message msg = {
5365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5366                 .rpc_argp = clp,
5367                 .rpc_cred = cred,
5368         };
5369         int status;
5370
5371         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5372         if (status)
5373                 dprintk("NFS: Got error %d from the server %s on "
5374                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5375         return status;
5376 }
5377
5378 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5379                 struct rpc_cred *cred)
5380 {
5381         unsigned int loop;
5382         int ret;
5383
5384         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5385                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5386                 switch (ret) {
5387                 case -NFS4ERR_DELAY:
5388                 case -NFS4ERR_CLIENTID_BUSY:
5389                         ssleep(1);
5390                         break;
5391                 default:
5392                         return ret;
5393                 }
5394         }
5395         return 0;
5396 }
5397
5398 int nfs4_destroy_clientid(struct nfs_client *clp)
5399 {
5400         struct rpc_cred *cred;
5401         int ret = 0;
5402
5403         if (clp->cl_mvops->minor_version < 1)
5404                 goto out;
5405         if (clp->cl_exchange_flags == 0)
5406                 goto out;
5407         if (clp->cl_preserve_clid)
5408                 goto out;
5409         cred = nfs4_get_exchange_id_cred(clp);
5410         ret = nfs4_proc_destroy_clientid(clp, cred);
5411         if (cred)
5412                 put_rpccred(cred);
5413         switch (ret) {
5414         case 0:
5415         case -NFS4ERR_STALE_CLIENTID:
5416                 clp->cl_exchange_flags = 0;
5417         }
5418 out:
5419         return ret;
5420 }
5421
5422 struct nfs4_get_lease_time_data {
5423         struct nfs4_get_lease_time_args *args;
5424         struct nfs4_get_lease_time_res *res;
5425         struct nfs_client *clp;
5426 };
5427
5428 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5429                                         void *calldata)
5430 {
5431         struct nfs4_get_lease_time_data *data =
5432                         (struct nfs4_get_lease_time_data *)calldata;
5433
5434         dprintk("--> %s\n", __func__);
5435         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5436         /* just setup sequence, do not trigger session recovery
5437            since we're invoked within one */
5438         nfs41_setup_sequence(data->clp->cl_session,
5439                         &data->args->la_seq_args,
5440                         &data->res->lr_seq_res,
5441                         task);
5442         dprintk("<-- %s\n", __func__);
5443 }
5444
5445 /*
5446  * Called from nfs4_state_manager thread for session setup, so don't recover
5447  * from sequence operation or clientid errors.
5448  */
5449 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5450 {
5451         struct nfs4_get_lease_time_data *data =
5452                         (struct nfs4_get_lease_time_data *)calldata;
5453
5454         dprintk("--> %s\n", __func__);
5455         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5456                 return;
5457         switch (task->tk_status) {
5458         case -NFS4ERR_DELAY:
5459         case -NFS4ERR_GRACE:
5460                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5461                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5462                 task->tk_status = 0;
5463                 /* fall through */
5464         case -NFS4ERR_RETRY_UNCACHED_REP:
5465                 rpc_restart_call_prepare(task);
5466                 return;
5467         }
5468         dprintk("<-- %s\n", __func__);
5469 }
5470
5471 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5472         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5473         .rpc_call_done = nfs4_get_lease_time_done,
5474 };
5475
5476 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5477 {
5478         struct rpc_task *task;
5479         struct nfs4_get_lease_time_args args;
5480         struct nfs4_get_lease_time_res res = {
5481                 .lr_fsinfo = fsinfo,
5482         };
5483         struct nfs4_get_lease_time_data data = {
5484                 .args = &args,
5485                 .res = &res,
5486                 .clp = clp,
5487         };
5488         struct rpc_message msg = {
5489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5490                 .rpc_argp = &args,
5491                 .rpc_resp = &res,
5492         };
5493         struct rpc_task_setup task_setup = {
5494                 .rpc_client = clp->cl_rpcclient,
5495                 .rpc_message = &msg,
5496                 .callback_ops = &nfs4_get_lease_time_ops,
5497                 .callback_data = &data,
5498                 .flags = RPC_TASK_TIMEOUT,
5499         };
5500         int status;
5501
5502         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5503         dprintk("--> %s\n", __func__);
5504         task = rpc_run_task(&task_setup);
5505
5506         if (IS_ERR(task))
5507                 status = PTR_ERR(task);
5508         else {
5509                 status = task->tk_status;
5510                 rpc_put_task(task);
5511         }
5512         dprintk("<-- %s return %d\n", __func__, status);
5513
5514         return status;
5515 }
5516
5517 /*
5518  * Initialize the values to be used by the client in CREATE_SESSION
5519  * If nfs4_init_session set the fore channel request and response sizes,
5520  * use them.
5521  *
5522  * Set the back channel max_resp_sz_cached to zero to force the client to
5523  * always set csa_cachethis to FALSE because the current implementation
5524  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5525  */
5526 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5527 {
5528         struct nfs4_session *session = args->client->cl_session;
5529         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5530                      mxresp_sz = session->fc_target_max_resp_sz;
5531
5532         if (mxrqst_sz == 0)
5533                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5534         if (mxresp_sz == 0)
5535                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5536         /* Fore channel attributes */
5537         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5538         args->fc_attrs.max_resp_sz = mxresp_sz;
5539         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5540         args->fc_attrs.max_reqs = max_session_slots;
5541
5542         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5543                 "max_ops=%u max_reqs=%u\n",
5544                 __func__,
5545                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5546                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5547
5548         /* Back channel attributes */
5549         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5550         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5551         args->bc_attrs.max_resp_sz_cached = 0;
5552         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5553         args->bc_attrs.max_reqs = 1;
5554
5555         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5556                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5557                 __func__,
5558                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5559                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5560                 args->bc_attrs.max_reqs);
5561 }
5562
5563 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5564 {
5565         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5566         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5567
5568         if (rcvd->max_resp_sz > sent->max_resp_sz)
5569                 return -EINVAL;
5570         /*
5571          * Our requested max_ops is the minimum we need; we're not
5572          * prepared to break up compounds into smaller pieces than that.
5573          * So, no point even trying to continue if the server won't
5574          * cooperate:
5575          */
5576         if (rcvd->max_ops < sent->max_ops)
5577                 return -EINVAL;
5578         if (rcvd->max_reqs == 0)
5579                 return -EINVAL;
5580         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5581                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5582         return 0;
5583 }
5584
5585 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5586 {
5587         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5588         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5589
5590         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5591                 return -EINVAL;
5592         if (rcvd->max_resp_sz < sent->max_resp_sz)
5593                 return -EINVAL;
5594         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5595                 return -EINVAL;
5596         /* These would render the backchannel useless: */
5597         if (rcvd->max_ops != sent->max_ops)
5598                 return -EINVAL;
5599         if (rcvd->max_reqs != sent->max_reqs)
5600                 return -EINVAL;
5601         return 0;
5602 }
5603
5604 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5605                                      struct nfs4_session *session)
5606 {
5607         int ret;
5608
5609         ret = nfs4_verify_fore_channel_attrs(args, session);
5610         if (ret)
5611                 return ret;
5612         return nfs4_verify_back_channel_attrs(args, session);
5613 }
5614
5615 static int _nfs4_proc_create_session(struct nfs_client *clp,
5616                 struct rpc_cred *cred)
5617 {
5618         struct nfs4_session *session = clp->cl_session;
5619         struct nfs41_create_session_args args = {
5620                 .client = clp,
5621                 .cb_program = NFS4_CALLBACK,
5622         };
5623         struct nfs41_create_session_res res = {
5624                 .client = clp,
5625         };
5626         struct rpc_message msg = {
5627                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5628                 .rpc_argp = &args,
5629                 .rpc_resp = &res,
5630                 .rpc_cred = cred,
5631         };
5632         int status;
5633
5634         nfs4_init_channel_attrs(&args);
5635         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5636
5637         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5638
5639         if (!status) {
5640                 /* Verify the session's negotiated channel_attrs values */
5641                 status = nfs4_verify_channel_attrs(&args, session);
5642                 /* Increment the clientid slot sequence id */
5643                 clp->cl_seqid++;
5644         }
5645
5646         return status;
5647 }
5648
5649 /*
5650  * Issues a CREATE_SESSION operation to the server.
5651  * It is the responsibility of the caller to verify the session is
5652  * expired before calling this routine.
5653  */
5654 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5655 {
5656         int status;
5657         unsigned *ptr;
5658         struct nfs4_session *session = clp->cl_session;
5659
5660         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5661
5662         status = _nfs4_proc_create_session(clp, cred);
5663         if (status)
5664                 goto out;
5665
5666         /* Init or reset the session slot tables */
5667         status = nfs4_setup_session_slot_tables(session);
5668         dprintk("slot table setup returned %d\n", status);
5669         if (status)
5670                 goto out;
5671
5672         ptr = (unsigned *)&session->sess_id.data[0];
5673         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5674                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5675 out:
5676         dprintk("<-- %s\n", __func__);
5677         return status;
5678 }
5679
5680 /*
5681  * Issue the over-the-wire RPC DESTROY_SESSION.
5682  * The caller must serialize access to this routine.
5683  */
5684 int nfs4_proc_destroy_session(struct nfs4_session *session,
5685                 struct rpc_cred *cred)
5686 {
5687         struct rpc_message msg = {
5688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5689                 .rpc_argp = session,
5690                 .rpc_cred = cred,
5691         };
5692         int status = 0;
5693
5694         dprintk("--> nfs4_proc_destroy_session\n");
5695
5696         /* session is still being setup */
5697         if (session->clp->cl_cons_state != NFS_CS_READY)
5698                 return status;
5699
5700         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5701
5702         if (status)
5703                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5704                         "Session has been destroyed regardless...\n", status);
5705
5706         dprintk("<-- nfs4_proc_destroy_session\n");
5707         return status;
5708 }
5709
5710 /*
5711  * Renew the cl_session lease.
5712  */
5713 struct nfs4_sequence_data {
5714         struct nfs_client *clp;
5715         struct nfs4_sequence_args args;
5716         struct nfs4_sequence_res res;
5717 };
5718
5719 static void nfs41_sequence_release(void *data)
5720 {
5721         struct nfs4_sequence_data *calldata = data;
5722         struct nfs_client *clp = calldata->clp;
5723
5724         if (atomic_read(&clp->cl_count) > 1)
5725                 nfs4_schedule_state_renewal(clp);
5726         nfs_put_client(clp);
5727         kfree(calldata);
5728 }
5729
5730 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5731 {
5732         switch(task->tk_status) {
5733         case -NFS4ERR_DELAY:
5734                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5735                 return -EAGAIN;
5736         default:
5737                 nfs4_schedule_lease_recovery(clp);
5738         }
5739         return 0;
5740 }
5741
5742 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5743 {
5744         struct nfs4_sequence_data *calldata = data;
5745         struct nfs_client *clp = calldata->clp;
5746
5747         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5748                 return;
5749
5750         if (task->tk_status < 0) {
5751                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5752                 if (atomic_read(&clp->cl_count) == 1)
5753                         goto out;
5754
5755                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5756                         rpc_restart_call_prepare(task);
5757                         return;
5758                 }
5759         }
5760         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5761 out:
5762         dprintk("<-- %s\n", __func__);
5763 }
5764
5765 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5766 {
5767         struct nfs4_sequence_data *calldata = data;
5768         struct nfs_client *clp = calldata->clp;
5769         struct nfs4_sequence_args *args;
5770         struct nfs4_sequence_res *res;
5771
5772         args = task->tk_msg.rpc_argp;
5773         res = task->tk_msg.rpc_resp;
5774
5775         nfs41_setup_sequence(clp->cl_session, args, res, task);
5776 }
5777
5778 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
5779 {
5780         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5781         nfs41_sequence_prepare(task, data);
5782 }
5783
5784 static const struct rpc_call_ops nfs41_sequence_ops = {
5785         .rpc_call_done = nfs41_sequence_call_done,
5786         .rpc_call_prepare = nfs41_sequence_prepare,
5787         .rpc_release = nfs41_sequence_release,
5788 };
5789
5790 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
5791         .rpc_call_done = nfs41_sequence_call_done,
5792         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
5793         .rpc_release = nfs41_sequence_release,
5794 };
5795
5796 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
5797                                              const struct rpc_call_ops *seq_ops)
5798 {
5799         struct nfs4_sequence_data *calldata;
5800         struct rpc_message msg = {
5801                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5802                 .rpc_cred = cred,
5803         };
5804         struct rpc_task_setup task_setup_data = {
5805                 .rpc_client = clp->cl_rpcclient,
5806                 .rpc_message = &msg,
5807                 .callback_ops = seq_ops,
5808                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5809         };
5810
5811         if (!atomic_inc_not_zero(&clp->cl_count))
5812                 return ERR_PTR(-EIO);
5813         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5814         if (calldata == NULL) {
5815                 nfs_put_client(clp);
5816                 return ERR_PTR(-ENOMEM);
5817         }
5818         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5819         msg.rpc_argp = &calldata->args;
5820         msg.rpc_resp = &calldata->res;
5821         calldata->clp = clp;
5822         task_setup_data.callback_data = calldata;
5823
5824         return rpc_run_task(&task_setup_data);
5825 }
5826
5827 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5828 {
5829         struct rpc_task *task;
5830         int ret = 0;
5831
5832         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5833                 return 0;
5834         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
5835         if (IS_ERR(task))
5836                 ret = PTR_ERR(task);
5837         else
5838                 rpc_put_task_async(task);
5839         dprintk("<-- %s status=%d\n", __func__, ret);
5840         return ret;
5841 }
5842
5843 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5844 {
5845         struct rpc_task *task;
5846         int ret;
5847
5848         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
5849         if (IS_ERR(task)) {
5850                 ret = PTR_ERR(task);
5851                 goto out;
5852         }
5853         ret = rpc_wait_for_completion_task(task);
5854         if (!ret) {
5855                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5856
5857                 if (task->tk_status == 0)
5858                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5859                 ret = task->tk_status;
5860         }
5861         rpc_put_task(task);
5862 out:
5863         dprintk("<-- %s status=%d\n", __func__, ret);
5864         return ret;
5865 }
5866
5867 struct nfs4_reclaim_complete_data {
5868         struct nfs_client *clp;
5869         struct nfs41_reclaim_complete_args arg;
5870         struct nfs41_reclaim_complete_res res;
5871 };
5872
5873 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5874 {
5875         struct nfs4_reclaim_complete_data *calldata = data;
5876
5877         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5878         nfs41_setup_sequence(calldata->clp->cl_session,
5879                         &calldata->arg.seq_args,
5880                         &calldata->res.seq_res,
5881                         task);
5882 }
5883
5884 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5885 {
5886         switch(task->tk_status) {
5887         case 0:
5888         case -NFS4ERR_COMPLETE_ALREADY:
5889         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5890                 break;
5891         case -NFS4ERR_DELAY:
5892                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5893                 /* fall through */
5894         case -NFS4ERR_RETRY_UNCACHED_REP:
5895                 return -EAGAIN;
5896         default:
5897                 nfs4_schedule_lease_recovery(clp);
5898         }
5899         return 0;
5900 }
5901
5902 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5903 {
5904         struct nfs4_reclaim_complete_data *calldata = data;
5905         struct nfs_client *clp = calldata->clp;
5906         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5907
5908         dprintk("--> %s\n", __func__);
5909         if (!nfs41_sequence_done(task, res))
5910                 return;
5911
5912         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5913                 rpc_restart_call_prepare(task);
5914                 return;
5915         }
5916         dprintk("<-- %s\n", __func__);
5917 }
5918
5919 static void nfs4_free_reclaim_complete_data(void *data)
5920 {
5921         struct nfs4_reclaim_complete_data *calldata = data;
5922
5923         kfree(calldata);
5924 }
5925
5926 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5927         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5928         .rpc_call_done = nfs4_reclaim_complete_done,
5929         .rpc_release = nfs4_free_reclaim_complete_data,
5930 };
5931
5932 /*
5933  * Issue a global reclaim complete.
5934  */
5935 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5936 {
5937         struct nfs4_reclaim_complete_data *calldata;
5938         struct rpc_task *task;
5939         struct rpc_message msg = {
5940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5941         };
5942         struct rpc_task_setup task_setup_data = {
5943                 .rpc_client = clp->cl_rpcclient,
5944                 .rpc_message = &msg,
5945                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5946                 .flags = RPC_TASK_ASYNC,
5947         };
5948         int status = -ENOMEM;
5949
5950         dprintk("--> %s\n", __func__);
5951         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5952         if (calldata == NULL)
5953                 goto out;
5954         calldata->clp = clp;
5955         calldata->arg.one_fs = 0;
5956
5957         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5958         msg.rpc_argp = &calldata->arg;
5959         msg.rpc_resp = &calldata->res;
5960         task_setup_data.callback_data = calldata;
5961         task = rpc_run_task(&task_setup_data);
5962         if (IS_ERR(task)) {
5963                 status = PTR_ERR(task);
5964                 goto out;
5965         }
5966         status = nfs4_wait_for_completion_rpc_task(task);
5967         if (status == 0)
5968                 status = task->tk_status;
5969         rpc_put_task(task);
5970         return 0;
5971 out:
5972         dprintk("<-- %s status=%d\n", __func__, status);
5973         return status;
5974 }
5975
5976 static void
5977 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5978 {
5979         struct nfs4_layoutget *lgp = calldata;
5980         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5981         struct nfs4_session *session = nfs4_get_session(server);
5982
5983         dprintk("--> %s\n", __func__);
5984         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5985          * right now covering the LAYOUTGET we are about to send.
5986          * However, that is not so catastrophic, and there seems
5987          * to be no way to prevent it completely.
5988          */
5989         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
5990                                 &lgp->res.seq_res, task))
5991                 return;
5992         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5993                                           NFS_I(lgp->args.inode)->layout,
5994                                           lgp->args.ctx->state)) {
5995                 rpc_exit(task, NFS4_OK);
5996         }
5997 }
5998
5999 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6000 {
6001         struct nfs4_layoutget *lgp = calldata;
6002         struct inode *inode = lgp->args.inode;
6003         struct nfs_server *server = NFS_SERVER(inode);
6004         struct pnfs_layout_hdr *lo;
6005         struct nfs4_state *state = NULL;
6006
6007         dprintk("--> %s\n", __func__);
6008
6009         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6010                 goto out;
6011
6012         switch (task->tk_status) {
6013         case 0:
6014                 goto out;
6015         case -NFS4ERR_LAYOUTTRYLATER:
6016         case -NFS4ERR_RECALLCONFLICT:
6017                 task->tk_status = -NFS4ERR_DELAY;
6018                 break;
6019         case -NFS4ERR_EXPIRED:
6020         case -NFS4ERR_BAD_STATEID:
6021                 spin_lock(&inode->i_lock);
6022                 lo = NFS_I(inode)->layout;
6023                 if (!lo || list_empty(&lo->plh_segs)) {
6024                         spin_unlock(&inode->i_lock);
6025                         /* If the open stateid was bad, then recover it. */
6026                         state = lgp->args.ctx->state;
6027                 } else {
6028                         LIST_HEAD(head);
6029
6030                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6031                         spin_unlock(&inode->i_lock);
6032                         /* Mark the bad layout state as invalid, then
6033                          * retry using the open stateid. */
6034                         pnfs_free_lseg_list(&head);
6035                 }
6036         }
6037         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6038                 rpc_restart_call_prepare(task);
6039 out:
6040         dprintk("<-- %s\n", __func__);
6041 }
6042
6043 static size_t max_response_pages(struct nfs_server *server)
6044 {
6045         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6046         return nfs_page_array_len(0, max_resp_sz);
6047 }
6048
6049 static void nfs4_free_pages(struct page **pages, size_t size)
6050 {
6051         int i;
6052
6053         if (!pages)
6054                 return;
6055
6056         for (i = 0; i < size; i++) {
6057                 if (!pages[i])
6058                         break;
6059                 __free_page(pages[i]);
6060         }
6061         kfree(pages);
6062 }
6063
6064 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6065 {
6066         struct page **pages;
6067         int i;
6068
6069         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6070         if (!pages) {
6071                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6072                 return NULL;
6073         }
6074
6075         for (i = 0; i < size; i++) {
6076                 pages[i] = alloc_page(gfp_flags);
6077                 if (!pages[i]) {
6078                         dprintk("%s: failed to allocate page\n", __func__);
6079                         nfs4_free_pages(pages, size);
6080                         return NULL;
6081                 }
6082         }
6083
6084         return pages;
6085 }
6086
6087 static void nfs4_layoutget_release(void *calldata)
6088 {
6089         struct nfs4_layoutget *lgp = calldata;
6090         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6091         size_t max_pages = max_response_pages(server);
6092
6093         dprintk("--> %s\n", __func__);
6094         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6095         put_nfs_open_context(lgp->args.ctx);
6096         kfree(calldata);
6097         dprintk("<-- %s\n", __func__);
6098 }
6099
6100 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6101         .rpc_call_prepare = nfs4_layoutget_prepare,
6102         .rpc_call_done = nfs4_layoutget_done,
6103         .rpc_release = nfs4_layoutget_release,
6104 };
6105
6106 struct pnfs_layout_segment *
6107 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6108 {
6109         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6110         size_t max_pages = max_response_pages(server);
6111         struct rpc_task *task;
6112         struct rpc_message msg = {
6113                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6114                 .rpc_argp = &lgp->args,
6115                 .rpc_resp = &lgp->res,
6116         };
6117         struct rpc_task_setup task_setup_data = {
6118                 .rpc_client = server->client,
6119                 .rpc_message = &msg,
6120                 .callback_ops = &nfs4_layoutget_call_ops,
6121                 .callback_data = lgp,
6122                 .flags = RPC_TASK_ASYNC,
6123         };
6124         struct pnfs_layout_segment *lseg = NULL;
6125         int status = 0;
6126
6127         dprintk("--> %s\n", __func__);
6128
6129         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6130         if (!lgp->args.layout.pages) {
6131                 nfs4_layoutget_release(lgp);
6132                 return ERR_PTR(-ENOMEM);
6133         }
6134         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6135
6136         lgp->res.layoutp = &lgp->args.layout;
6137         lgp->res.seq_res.sr_slot = NULL;
6138         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6139         task = rpc_run_task(&task_setup_data);
6140         if (IS_ERR(task))
6141                 return ERR_CAST(task);
6142         status = nfs4_wait_for_completion_rpc_task(task);
6143         if (status == 0)
6144                 status = task->tk_status;
6145         if (status == 0)
6146                 lseg = pnfs_layout_process(lgp);
6147         rpc_put_task(task);
6148         dprintk("<-- %s status=%d\n", __func__, status);
6149         if (status)
6150                 return ERR_PTR(status);
6151         return lseg;
6152 }
6153
6154 static void
6155 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6156 {
6157         struct nfs4_layoutreturn *lrp = calldata;
6158
6159         dprintk("--> %s\n", __func__);
6160         nfs41_setup_sequence(lrp->clp->cl_session,
6161                         &lrp->args.seq_args,
6162                         &lrp->res.seq_res,
6163                         task);
6164 }
6165
6166 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6167 {
6168         struct nfs4_layoutreturn *lrp = calldata;
6169         struct nfs_server *server;
6170
6171         dprintk("--> %s\n", __func__);
6172
6173         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6174                 return;
6175
6176         server = NFS_SERVER(lrp->args.inode);
6177         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6178                 rpc_restart_call_prepare(task);
6179                 return;
6180         }
6181         dprintk("<-- %s\n", __func__);
6182 }
6183
6184 static void nfs4_layoutreturn_release(void *calldata)
6185 {
6186         struct nfs4_layoutreturn *lrp = calldata;
6187         struct pnfs_layout_hdr *lo = lrp->args.layout;
6188
6189         dprintk("--> %s\n", __func__);
6190         spin_lock(&lo->plh_inode->i_lock);
6191         if (lrp->res.lrs_present)
6192                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6193         lo->plh_block_lgets--;
6194         spin_unlock(&lo->plh_inode->i_lock);
6195         pnfs_put_layout_hdr(lrp->args.layout);
6196         kfree(calldata);
6197         dprintk("<-- %s\n", __func__);
6198 }
6199
6200 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6201         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6202         .rpc_call_done = nfs4_layoutreturn_done,
6203         .rpc_release = nfs4_layoutreturn_release,
6204 };
6205
6206 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6207 {
6208         struct rpc_task *task;
6209         struct rpc_message msg = {
6210                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6211                 .rpc_argp = &lrp->args,
6212                 .rpc_resp = &lrp->res,
6213         };
6214         struct rpc_task_setup task_setup_data = {
6215                 .rpc_client = lrp->clp->cl_rpcclient,
6216                 .rpc_message = &msg,
6217                 .callback_ops = &nfs4_layoutreturn_call_ops,
6218                 .callback_data = lrp,
6219         };
6220         int status;
6221
6222         dprintk("--> %s\n", __func__);
6223         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6224         task = rpc_run_task(&task_setup_data);
6225         if (IS_ERR(task))
6226                 return PTR_ERR(task);
6227         status = task->tk_status;
6228         dprintk("<-- %s status=%d\n", __func__, status);
6229         rpc_put_task(task);
6230         return status;
6231 }
6232
6233 /*
6234  * Retrieve the list of Data Server devices from the MDS.
6235  */
6236 static int _nfs4_getdevicelist(struct nfs_server *server,
6237                                     const struct nfs_fh *fh,
6238                                     struct pnfs_devicelist *devlist)
6239 {
6240         struct nfs4_getdevicelist_args args = {
6241                 .fh = fh,
6242                 .layoutclass = server->pnfs_curr_ld->id,
6243         };
6244         struct nfs4_getdevicelist_res res = {
6245                 .devlist = devlist,
6246         };
6247         struct rpc_message msg = {
6248                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6249                 .rpc_argp = &args,
6250                 .rpc_resp = &res,
6251         };
6252         int status;
6253
6254         dprintk("--> %s\n", __func__);
6255         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6256                                 &res.seq_res, 0);
6257         dprintk("<-- %s status=%d\n", __func__, status);
6258         return status;
6259 }
6260
6261 int nfs4_proc_getdevicelist(struct nfs_server *server,
6262                             const struct nfs_fh *fh,
6263                             struct pnfs_devicelist *devlist)
6264 {
6265         struct nfs4_exception exception = { };
6266         int err;
6267
6268         do {
6269                 err = nfs4_handle_exception(server,
6270                                 _nfs4_getdevicelist(server, fh, devlist),
6271                                 &exception);
6272         } while (exception.retry);
6273
6274         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6275                 err, devlist->num_devs);
6276
6277         return err;
6278 }
6279 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6280
6281 static int
6282 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6283 {
6284         struct nfs4_getdeviceinfo_args args = {
6285                 .pdev = pdev,
6286         };
6287         struct nfs4_getdeviceinfo_res res = {
6288                 .pdev = pdev,
6289         };
6290         struct rpc_message msg = {
6291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6292                 .rpc_argp = &args,
6293                 .rpc_resp = &res,
6294         };
6295         int status;
6296
6297         dprintk("--> %s\n", __func__);
6298         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6299         dprintk("<-- %s status=%d\n", __func__, status);
6300
6301         return status;
6302 }
6303
6304 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6305 {
6306         struct nfs4_exception exception = { };
6307         int err;
6308
6309         do {
6310                 err = nfs4_handle_exception(server,
6311                                         _nfs4_proc_getdeviceinfo(server, pdev),
6312                                         &exception);
6313         } while (exception.retry);
6314         return err;
6315 }
6316 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6317
6318 static void nfs4_layoutcommit_prepare(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         struct nfs4_session *session = nfs4_get_session(server);
6323
6324         nfs41_setup_sequence(session,
6325                         &data->args.seq_args,
6326                         &data->res.seq_res,
6327                         task);
6328 }
6329
6330 static void
6331 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6332 {
6333         struct nfs4_layoutcommit_data *data = calldata;
6334         struct nfs_server *server = NFS_SERVER(data->args.inode);
6335
6336         if (!nfs41_sequence_done(task, &data->res.seq_res))
6337                 return;
6338
6339         switch (task->tk_status) { /* Just ignore these failures */
6340         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6341         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6342         case -NFS4ERR_BADLAYOUT:     /* no layout */
6343         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6344                 task->tk_status = 0;
6345                 break;
6346         case 0:
6347                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6348                                                    data->res.fattr);
6349                 break;
6350         default:
6351                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6352                         rpc_restart_call_prepare(task);
6353                         return;
6354                 }
6355         }
6356 }
6357
6358 static void nfs4_layoutcommit_release(void *calldata)
6359 {
6360         struct nfs4_layoutcommit_data *data = calldata;
6361         struct pnfs_layout_segment *lseg, *tmp;
6362         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6363
6364         pnfs_cleanup_layoutcommit(data);
6365         /* Matched by references in pnfs_set_layoutcommit */
6366         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6367                 list_del_init(&lseg->pls_lc_list);
6368                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6369                                        &lseg->pls_flags))
6370                         pnfs_put_lseg(lseg);
6371         }
6372
6373         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6374         smp_mb__after_clear_bit();
6375         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6376
6377         put_rpccred(data->cred);
6378         kfree(data);
6379 }
6380
6381 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6382         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6383         .rpc_call_done = nfs4_layoutcommit_done,
6384         .rpc_release = nfs4_layoutcommit_release,
6385 };
6386
6387 int
6388 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6389 {
6390         struct rpc_message msg = {
6391                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6392                 .rpc_argp = &data->args,
6393                 .rpc_resp = &data->res,
6394                 .rpc_cred = data->cred,
6395         };
6396         struct rpc_task_setup task_setup_data = {
6397                 .task = &data->task,
6398                 .rpc_client = NFS_CLIENT(data->args.inode),
6399                 .rpc_message = &msg,
6400                 .callback_ops = &nfs4_layoutcommit_ops,
6401                 .callback_data = data,
6402                 .flags = RPC_TASK_ASYNC,
6403         };
6404         struct rpc_task *task;
6405         int status = 0;
6406
6407         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6408                 "lbw: %llu inode %lu\n",
6409                 data->task.tk_pid, sync,
6410                 data->args.lastbytewritten,
6411                 data->args.inode->i_ino);
6412
6413         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6414         task = rpc_run_task(&task_setup_data);
6415         if (IS_ERR(task))
6416                 return PTR_ERR(task);
6417         if (sync == false)
6418                 goto out;
6419         status = nfs4_wait_for_completion_rpc_task(task);
6420         if (status != 0)
6421                 goto out;
6422         status = task->tk_status;
6423 out:
6424         dprintk("%s: status %d\n", __func__, status);
6425         rpc_put_task(task);
6426         return status;
6427 }
6428
6429 static int
6430 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6431                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6432 {
6433         struct nfs41_secinfo_no_name_args args = {
6434                 .style = SECINFO_STYLE_CURRENT_FH,
6435         };
6436         struct nfs4_secinfo_res res = {
6437                 .flavors = flavors,
6438         };
6439         struct rpc_message msg = {
6440                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6441                 .rpc_argp = &args,
6442                 .rpc_resp = &res,
6443         };
6444         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6445 }
6446
6447 static int
6448 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6449                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6450 {
6451         struct nfs4_exception exception = { };
6452         int err;
6453         do {
6454                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6455                 switch (err) {
6456                 case 0:
6457                 case -NFS4ERR_WRONGSEC:
6458                 case -NFS4ERR_NOTSUPP:
6459                         goto out;
6460                 default:
6461                         err = nfs4_handle_exception(server, err, &exception);
6462                 }
6463         } while (exception.retry);
6464 out:
6465         return err;
6466 }
6467
6468 static int
6469 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6470                     struct nfs_fsinfo *info)
6471 {
6472         int err;
6473         struct page *page;
6474         rpc_authflavor_t flavor;
6475         struct nfs4_secinfo_flavors *flavors;
6476
6477         page = alloc_page(GFP_KERNEL);
6478         if (!page) {
6479                 err = -ENOMEM;
6480                 goto out;
6481         }
6482
6483         flavors = page_address(page);
6484         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6485
6486         /*
6487          * Fall back on "guess and check" method if
6488          * the server doesn't support SECINFO_NO_NAME
6489          */
6490         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6491                 err = nfs4_find_root_sec(server, fhandle, info);
6492                 goto out_freepage;
6493         }
6494         if (err)
6495                 goto out_freepage;
6496
6497         flavor = nfs_find_best_sec(flavors);
6498         if (err == 0)
6499                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6500
6501 out_freepage:
6502         put_page(page);
6503         if (err == -EACCES)
6504                 return -EPERM;
6505 out:
6506         return err;
6507 }
6508
6509 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6510 {
6511         int status;
6512         struct nfs41_test_stateid_args args = {
6513                 .stateid = stateid,
6514         };
6515         struct nfs41_test_stateid_res res;
6516         struct rpc_message msg = {
6517                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6518                 .rpc_argp = &args,
6519                 .rpc_resp = &res,
6520         };
6521
6522         dprintk("NFS call  test_stateid %p\n", stateid);
6523         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6524         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6525         if (status != NFS_OK) {
6526                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6527                 return status;
6528         }
6529         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6530         return -res.status;
6531 }
6532
6533 /**
6534  * nfs41_test_stateid - perform a TEST_STATEID operation
6535  *
6536  * @server: server / transport on which to perform the operation
6537  * @stateid: state ID to test
6538  *
6539  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6540  * Otherwise a negative NFS4ERR value is returned if the operation
6541  * failed or the state ID is not currently valid.
6542  */
6543 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6544 {
6545         struct nfs4_exception exception = { };
6546         int err;
6547         do {
6548                 err = _nfs41_test_stateid(server, stateid);
6549                 if (err != -NFS4ERR_DELAY)
6550                         break;
6551                 nfs4_handle_exception(server, err, &exception);
6552         } while (exception.retry);
6553         return err;
6554 }
6555
6556 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6557 {
6558         struct nfs41_free_stateid_args args = {
6559                 .stateid = stateid,
6560         };
6561         struct nfs41_free_stateid_res res;
6562         struct rpc_message msg = {
6563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6564                 .rpc_argp = &args,
6565                 .rpc_resp = &res,
6566         };
6567         int status;
6568
6569         dprintk("NFS call  free_stateid %p\n", stateid);
6570         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6571         status = nfs4_call_sync_sequence(server->client, server, &msg,
6572                                          &args.seq_args, &res.seq_res, 1);
6573         dprintk("NFS reply free_stateid: %d\n", status);
6574         return status;
6575 }
6576
6577 /**
6578  * nfs41_free_stateid - perform a FREE_STATEID operation
6579  *
6580  * @server: server / transport on which to perform the operation
6581  * @stateid: state ID to release
6582  *
6583  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6584  * negative NFS4ERR value is returned.
6585  */
6586 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6587 {
6588         struct nfs4_exception exception = { };
6589         int err;
6590         do {
6591                 err = _nfs4_free_stateid(server, stateid);
6592                 if (err != -NFS4ERR_DELAY)
6593                         break;
6594                 nfs4_handle_exception(server, err, &exception);
6595         } while (exception.retry);
6596         return err;
6597 }
6598
6599 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6600                 const nfs4_stateid *s2)
6601 {
6602         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6603                 return false;
6604
6605         if (s1->seqid == s2->seqid)
6606                 return true;
6607         if (s1->seqid == 0 || s2->seqid == 0)
6608                 return true;
6609
6610         return false;
6611 }
6612
6613 #endif /* CONFIG_NFS_V4_1 */
6614
6615 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6616                 const nfs4_stateid *s2)
6617 {
6618         return nfs4_stateid_match(s1, s2);
6619 }
6620
6621
6622 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6623         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6624         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6625         .recover_open   = nfs4_open_reclaim,
6626         .recover_lock   = nfs4_lock_reclaim,
6627         .establish_clid = nfs4_init_clientid,
6628         .get_clid_cred  = nfs4_get_setclientid_cred,
6629         .detect_trunking = nfs40_discover_server_trunking,
6630 };
6631
6632 #if defined(CONFIG_NFS_V4_1)
6633 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6634         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6635         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6636         .recover_open   = nfs4_open_reclaim,
6637         .recover_lock   = nfs4_lock_reclaim,
6638         .establish_clid = nfs41_init_clientid,
6639         .get_clid_cred  = nfs4_get_exchange_id_cred,
6640         .reclaim_complete = nfs41_proc_reclaim_complete,
6641         .detect_trunking = nfs41_discover_server_trunking,
6642 };
6643 #endif /* CONFIG_NFS_V4_1 */
6644
6645 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6646         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6647         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6648         .recover_open   = nfs4_open_expired,
6649         .recover_lock   = nfs4_lock_expired,
6650         .establish_clid = nfs4_init_clientid,
6651         .get_clid_cred  = nfs4_get_setclientid_cred,
6652 };
6653
6654 #if defined(CONFIG_NFS_V4_1)
6655 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6656         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6657         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6658         .recover_open   = nfs41_open_expired,
6659         .recover_lock   = nfs41_lock_expired,
6660         .establish_clid = nfs41_init_clientid,
6661         .get_clid_cred  = nfs4_get_exchange_id_cred,
6662 };
6663 #endif /* CONFIG_NFS_V4_1 */
6664
6665 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6666         .sched_state_renewal = nfs4_proc_async_renew,
6667         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6668         .renew_lease = nfs4_proc_renew,
6669 };
6670
6671 #if defined(CONFIG_NFS_V4_1)
6672 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6673         .sched_state_renewal = nfs41_proc_async_sequence,
6674         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6675         .renew_lease = nfs4_proc_sequence,
6676 };
6677 #endif
6678
6679 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6680         .minor_version = 0,
6681         .call_sync = _nfs4_call_sync,
6682         .match_stateid = nfs4_match_stateid,
6683         .find_root_sec = nfs4_find_root_sec,
6684         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6685         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6686         .state_renewal_ops = &nfs40_state_renewal_ops,
6687 };
6688
6689 #if defined(CONFIG_NFS_V4_1)
6690 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6691         .minor_version = 1,
6692         .call_sync = _nfs4_call_sync_session,
6693         .match_stateid = nfs41_match_stateid,
6694         .find_root_sec = nfs41_find_root_sec,
6695         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6696         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6697         .state_renewal_ops = &nfs41_state_renewal_ops,
6698 };
6699 #endif
6700
6701 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6702         [0] = &nfs_v4_0_minor_ops,
6703 #if defined(CONFIG_NFS_V4_1)
6704         [1] = &nfs_v4_1_minor_ops,
6705 #endif
6706 };
6707
6708 const struct inode_operations nfs4_dir_inode_operations = {
6709         .create         = nfs_create,
6710         .lookup         = nfs_lookup,
6711         .atomic_open    = nfs_atomic_open,
6712         .link           = nfs_link,
6713         .unlink         = nfs_unlink,
6714         .symlink        = nfs_symlink,
6715         .mkdir          = nfs_mkdir,
6716         .rmdir          = nfs_rmdir,
6717         .mknod          = nfs_mknod,
6718         .rename         = nfs_rename,
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 static const struct inode_operations nfs4_file_inode_operations = {
6729         .permission     = nfs_permission,
6730         .getattr        = nfs_getattr,
6731         .setattr        = nfs_setattr,
6732         .getxattr       = generic_getxattr,
6733         .setxattr       = generic_setxattr,
6734         .listxattr      = generic_listxattr,
6735         .removexattr    = generic_removexattr,
6736 };
6737
6738 const struct nfs_rpc_ops nfs_v4_clientops = {
6739         .version        = 4,                    /* protocol version */
6740         .dentry_ops     = &nfs4_dentry_operations,
6741         .dir_inode_ops  = &nfs4_dir_inode_operations,
6742         .file_inode_ops = &nfs4_file_inode_operations,
6743         .file_ops       = &nfs4_file_operations,
6744         .getroot        = nfs4_proc_get_root,
6745         .submount       = nfs4_submount,
6746         .try_mount      = nfs4_try_mount,
6747         .getattr        = nfs4_proc_getattr,
6748         .setattr        = nfs4_proc_setattr,
6749         .lookup         = nfs4_proc_lookup,
6750         .access         = nfs4_proc_access,
6751         .readlink       = nfs4_proc_readlink,
6752         .create         = nfs4_proc_create,
6753         .remove         = nfs4_proc_remove,
6754         .unlink_setup   = nfs4_proc_unlink_setup,
6755         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6756         .unlink_done    = nfs4_proc_unlink_done,
6757         .rename         = nfs4_proc_rename,
6758         .rename_setup   = nfs4_proc_rename_setup,
6759         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6760         .rename_done    = nfs4_proc_rename_done,
6761         .link           = nfs4_proc_link,
6762         .symlink        = nfs4_proc_symlink,
6763         .mkdir          = nfs4_proc_mkdir,
6764         .rmdir          = nfs4_proc_remove,
6765         .readdir        = nfs4_proc_readdir,
6766         .mknod          = nfs4_proc_mknod,
6767         .statfs         = nfs4_proc_statfs,
6768         .fsinfo         = nfs4_proc_fsinfo,
6769         .pathconf       = nfs4_proc_pathconf,
6770         .set_capabilities = nfs4_server_capabilities,
6771         .decode_dirent  = nfs4_decode_dirent,
6772         .read_setup     = nfs4_proc_read_setup,
6773         .read_pageio_init = pnfs_pageio_init_read,
6774         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6775         .read_done      = nfs4_read_done,
6776         .write_setup    = nfs4_proc_write_setup,
6777         .write_pageio_init = pnfs_pageio_init_write,
6778         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6779         .write_done     = nfs4_write_done,
6780         .commit_setup   = nfs4_proc_commit_setup,
6781         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6782         .commit_done    = nfs4_commit_done,
6783         .lock           = nfs4_proc_lock,
6784         .clear_acl_cache = nfs4_zap_acl_attr,
6785         .close_context  = nfs4_close_context,
6786         .open_context   = nfs4_atomic_open,
6787         .have_delegation = nfs4_have_delegation,
6788         .return_delegation = nfs4_inode_return_delegation,
6789         .alloc_client   = nfs4_alloc_client,
6790         .init_client    = nfs4_init_client,
6791         .free_client    = nfs4_free_client,
6792         .create_server  = nfs4_create_server,
6793         .clone_server   = nfs_clone_server,
6794 };
6795
6796 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6797         .prefix = XATTR_NAME_NFSV4_ACL,
6798         .list   = nfs4_xattr_list_nfs4_acl,
6799         .get    = nfs4_xattr_get_nfs4_acl,
6800         .set    = nfs4_xattr_set_nfs4_acl,
6801 };
6802
6803 const struct xattr_handler *nfs4_xattr_handlers[] = {
6804         &nfs4_xattr_nfs4_acl_handler,
6805         NULL
6806 };
6807
6808 /*
6809  * Local variables:
6810  *  c-basic-offset: 8
6811  * End:
6812  */