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         args->sa_privileged = 0;
 494         if (cache_reply)
 495                 args->sa_cache_this = 1;
 496         res->sr_slot = NULL;
 497 }
 498
 499 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 500 {
 501         args->sa_privileged = 1;
 502 }
 503
 504 int nfs41_setup_sequence(struct nfs4_session *session,
 505                                 struct nfs4_sequence_args *args,
 506                                 struct nfs4_sequence_res *res,
 507                                 struct rpc_task *task)
 508 {
 509         struct nfs4_slot *slot;
 510         struct nfs4_slot_table *tbl;
 511
 512         dprintk("--> %s\n", __func__);
 513         /* slot already allocated? */
 514         if (res->sr_slot != NULL)
 515                 goto out_success;
 516
 517         tbl = &session->fc_slot_table;
 518
 519         task->tk_timeout = 0;
 520
 521         spin_lock(&tbl->slot_tbl_lock);
 522         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 523             !args->sa_privileged) {
 524                 /* The state manager will wait until the slot table is empty */
 525                 dprintk("%s session is draining\n", __func__);
 526                 goto out_sleep;
 527         }
 528
 529         slot = nfs4_alloc_slot(tbl);
 530         if (IS_ERR(slot)) {
 531                 /* If out of memory, try again in 1/4 second */
 532                 if (slot == ERR_PTR(-ENOMEM))
 533                         task->tk_timeout = HZ >> 2;
 534                 dprintk("<-- %s: no free slots\n", __func__);
 535                 goto out_sleep;
 536         }
 537         spin_unlock(&tbl->slot_tbl_lock);
 538
 539         args->sa_slot = slot;
 540
 541         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 542                         slot->slot_nr, slot->seq_nr);
 543
 544         res->sr_slot = slot;
 545         res->sr_status_flags = 0;
 546         /*
 547          * sr_status is only set in decode_sequence, and so will remain
 548          * set to 1 if an rpc level failure occurs.
 549          */
 550         res->sr_status = 1;
 551 out_success:
 552         rpc_call_start(task);
 553         return 0;
 554 out_sleep:
 555         /* Privileged tasks are queued with top priority */
 556         if (args->sa_privileged)
 557                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 558                                 NULL, RPC_PRIORITY_PRIVILEGED);
 559         else
 560                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 561         spin_unlock(&tbl->slot_tbl_lock);
 562         return -EAGAIN;
 563 }
 564 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 565
 566 int nfs4_setup_sequence(const struct nfs_server *server,
 567                         struct nfs4_sequence_args *args,
 568                         struct nfs4_sequence_res *res,
 569                         struct rpc_task *task)
 570 {
 571         struct nfs4_session *session = nfs4_get_session(server);
 572         int ret = 0;
 573
 574         if (session == NULL) {
 575                 rpc_call_start(task);
 576                 goto out;
 577         }
 578
 579         dprintk("--> %s clp %p session %p sr_slot %d\n",
 580                 __func__, session->clp, session, res->sr_slot ?
 581                         res->sr_slot->slot_nr : -1);
 582
 583         ret = nfs41_setup_sequence(session, args, res, task);
 584 out:
 585         dprintk("<-- %s status=%d\n", __func__, ret);
 586         return ret;
 587 }
 588
 589 struct nfs41_call_sync_data {
 590         const struct nfs_server *seq_server;
 591         struct nfs4_sequence_args *seq_args;
 592         struct nfs4_sequence_res *seq_res;
 593 };
 594
 595 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 596 {
 597         struct nfs41_call_sync_data *data = calldata;
 598         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 599
 600         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 601
 602         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 603 }
 604
 605 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 606 {
 607         struct nfs41_call_sync_data *data = calldata;
 608
 609         nfs41_sequence_done(task, data->seq_res);
 610 }
 611
 612 static const struct rpc_call_ops nfs41_call_sync_ops = {
 613         .rpc_call_prepare = nfs41_call_sync_prepare,
 614         .rpc_call_done = nfs41_call_sync_done,
 615 };
 616
 617 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 618                                    struct nfs_server *server,
 619                                    struct rpc_message *msg,
 620                                    struct nfs4_sequence_args *args,
 621                                    struct nfs4_sequence_res *res)
 622 {
 623         int ret;
 624         struct rpc_task *task;
 625         struct nfs41_call_sync_data data = {
 626                 .seq_server = server,
 627                 .seq_args = args,
 628                 .seq_res = res,
 629         };
 630         struct rpc_task_setup task_setup = {
 631                 .rpc_client = clnt,
 632                 .rpc_message = msg,
 633                 .callback_ops = &nfs41_call_sync_ops,
 634                 .callback_data = &data
 635         };
 636
 637         task = rpc_run_task(&task_setup);
 638         if (IS_ERR(task))
 639                 ret = PTR_ERR(task);
 640         else {
 641                 ret = task->tk_status;
 642                 rpc_put_task(task);
 643         }
 644         return ret;
 645 }
 646
 647 #else
 648 static
 649 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 650                 struct nfs4_sequence_res *res, int cache_reply)
 651 {
 652 }
 653
 654 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 655 {
 656 }
 657
 658
 659 static int nfs4_sequence_done(struct rpc_task *task,
 660                                struct nfs4_sequence_res *res)
 661 {
 662         return 1;
 663 }
 664 #endif /* CONFIG_NFS_V4_1 */
 665
 666 static
 667 int _nfs4_call_sync(struct rpc_clnt *clnt,
 668                     struct nfs_server *server,
 669                     struct rpc_message *msg,
 670                     struct nfs4_sequence_args *args,
 671                     struct nfs4_sequence_res *res)
 672 {
 673         return rpc_call_sync(clnt, msg, 0);
 674 }
 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                    int cache_reply)
 683 {
 684         nfs41_init_sequence(args, res, cache_reply);
 685         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 686                                                 args, res);
 687 }
 688
 689 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 690 {
 691         struct nfs_inode *nfsi = NFS_I(dir);
 692
 693         spin_lock(&dir->i_lock);
 694         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 695         if (!cinfo->atomic || cinfo->before != dir->i_version)
 696                 nfs_force_lookup_revalidate(dir);
 697         dir->i_version = cinfo->after;
 698         spin_unlock(&dir->i_lock);
 699 }
 700
 701 struct nfs4_opendata {
 702         struct kref kref;
 703         struct nfs_openargs o_arg;
 704         struct nfs_openres o_res;
 705         struct nfs_open_confirmargs c_arg;
 706         struct nfs_open_confirmres c_res;
 707         struct nfs4_string owner_name;
 708         struct nfs4_string group_name;
 709         struct nfs_fattr f_attr;
 710         struct dentry *dir;
 711         struct dentry *dentry;
 712         struct nfs4_state_owner *owner;
 713         struct nfs4_state *state;
 714         struct iattr attrs;
 715         unsigned long timestamp;
 716         unsigned int rpc_done : 1;
 717         int rpc_status;
 718         int cancelled;
 719 };
 720
 721
 722 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 723 {
 724         p->o_res.f_attr = &p->f_attr;
 725         p->o_res.seqid = p->o_arg.seqid;
 726         p->c_res.seqid = p->c_arg.seqid;
 727         p->o_res.server = p->o_arg.server;
 728         p->o_res.access_request = p->o_arg.access;
 729         nfs_fattr_init(&p->f_attr);
 730         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 731 }
 732
 733 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 734                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 735                 const struct iattr *attrs,
 736                 gfp_t gfp_mask)
 737 {
 738         struct dentry *parent = dget_parent(dentry);
 739         struct inode *dir = parent->d_inode;
 740         struct nfs_server *server = NFS_SERVER(dir);
 741         struct nfs4_opendata *p;
 742
 743         p = kzalloc(sizeof(*p), gfp_mask);
 744         if (p == NULL)
 745                 goto err;
 746         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 747         if (p->o_arg.seqid == NULL)
 748                 goto err_free;
 749         nfs_sb_active(dentry->d_sb);
 750         p->dentry = dget(dentry);
 751         p->dir = parent;
 752         p->owner = sp;
 753         atomic_inc(&sp->so_count);
 754         p->o_arg.fh = NFS_FH(dir);
 755         p->o_arg.open_flags = flags;
 756         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 757         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 758          * will return permission denied for all bits until close */
 759         if (!(flags & O_EXCL)) {
 760                 /* ask server to check for all possible rights as results
 761                  * are cached */
 762                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 763                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 764         }
 765         p->o_arg.clientid = server->nfs_client->cl_clientid;
 766         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 767         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 768         p->o_arg.name = &dentry->d_name;
 769         p->o_arg.server = server;
 770         p->o_arg.bitmask = server->attr_bitmask;
 771         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 772         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 773         if (attrs != NULL && attrs->ia_valid != 0) {
 774                 __be32 verf[2];
 775
 776                 p->o_arg.u.attrs = &p->attrs;
 777                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 778
 779                 verf[0] = jiffies;
 780                 verf[1] = current->pid;
 781                 memcpy(p->o_arg.u.verifier.data, verf,
 782                                 sizeof(p->o_arg.u.verifier.data));
 783         }
 784         p->c_arg.fh = &p->o_res.fh;
 785         p->c_arg.stateid = &p->o_res.stateid;
 786         p->c_arg.seqid = p->o_arg.seqid;
 787         nfs4_init_opendata_res(p);
 788         kref_init(&p->kref);
 789         return p;
 790 err_free:
 791         kfree(p);
 792 err:
 793         dput(parent);
 794         return NULL;
 795 }
 796
 797 static void nfs4_opendata_free(struct kref *kref)
 798 {
 799         struct nfs4_opendata *p = container_of(kref,
 800                         struct nfs4_opendata, kref);
 801         struct super_block *sb = p->dentry->d_sb;
 802
 803         nfs_free_seqid(p->o_arg.seqid);
 804         if (p->state != NULL)
 805                 nfs4_put_open_state(p->state);
 806         nfs4_put_state_owner(p->owner);
 807         dput(p->dir);
 808         dput(p->dentry);
 809         nfs_sb_deactive(sb);
 810         nfs_fattr_free_names(&p->f_attr);
 811         kfree(p);
 812 }
 813
 814 static void nfs4_opendata_put(struct nfs4_opendata *p)
 815 {
 816         if (p != NULL)
 817                 kref_put(&p->kref, nfs4_opendata_free);
 818 }
 819
 820 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 821 {
 822         int ret;
 823
 824         ret = rpc_wait_for_completion_task(task);
 825         return ret;
 826 }
 827
 828 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 829 {
 830         int ret = 0;
 831
 832         if (open_mode & (O_EXCL|O_TRUNC))
 833                 goto out;
 834         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 835                 case FMODE_READ:
 836                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 837                                 && state->n_rdonly != 0;
 838                         break;
 839                 case FMODE_WRITE:
 840                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 841                                 && state->n_wronly != 0;
 842                         break;
 843                 case FMODE_READ|FMODE_WRITE:
 844                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 845                                 && state->n_rdwr != 0;
 846         }
 847 out:
 848         return ret;
 849 }
 850
 851 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 852 {
 853         if (delegation == NULL)
 854                 return 0;
 855         if ((delegation->type & fmode) != fmode)
 856                 return 0;
 857         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 858                 return 0;
 859         nfs_mark_delegation_referenced(delegation);
 860         return 1;
 861 }
 862
 863 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 864 {
 865         switch (fmode) {
 866                 case FMODE_WRITE:
 867                         state->n_wronly++;
 868                         break;
 869                 case FMODE_READ:
 870                         state->n_rdonly++;
 871                         break;
 872                 case FMODE_READ|FMODE_WRITE:
 873                         state->n_rdwr++;
 874         }
 875         nfs4_state_set_mode_locked(state, state->state | fmode);
 876 }
 877
 878 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 879 {
 880         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 881                 nfs4_stateid_copy(&state->stateid, stateid);
 882         nfs4_stateid_copy(&state->open_stateid, stateid);
 883         switch (fmode) {
 884                 case FMODE_READ:
 885                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 886                         break;
 887                 case FMODE_WRITE:
 888                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 889                         break;
 890                 case FMODE_READ|FMODE_WRITE:
 891                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 892         }
 893 }
 894
 895 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 896 {
 897         write_seqlock(&state->seqlock);
 898         nfs_set_open_stateid_locked(state, stateid, fmode);
 899         write_sequnlock(&state->seqlock);
 900 }
 901
 902 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 903 {
 904         /*
 905          * Protect the call to nfs4_state_set_mode_locked and
 906          * serialise the stateid update
 907          */
 908         write_seqlock(&state->seqlock);
 909         if (deleg_stateid != NULL) {
 910                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 911                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 912         }
 913         if (open_stateid != NULL)
 914                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 915         write_sequnlock(&state->seqlock);
 916         spin_lock(&state->owner->so_lock);
 917         update_open_stateflags(state, fmode);
 918         spin_unlock(&state->owner->so_lock);
 919 }
 920
 921 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 922 {
 923         struct nfs_inode *nfsi = NFS_I(state->inode);
 924         struct nfs_delegation *deleg_cur;
 925         int ret = 0;
 926
 927         fmode &= (FMODE_READ|FMODE_WRITE);
 928
 929         rcu_read_lock();
 930         deleg_cur = rcu_dereference(nfsi->delegation);
 931         if (deleg_cur == NULL)
 932                 goto no_delegation;
 933
 934         spin_lock(&deleg_cur->lock);
 935         if (nfsi->delegation != deleg_cur ||
 936             (deleg_cur->type & fmode) != fmode)
 937                 goto no_delegation_unlock;
 938
 939         if (delegation == NULL)
 940                 delegation = &deleg_cur->stateid;
 941         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 942                 goto no_delegation_unlock;
 943
 944         nfs_mark_delegation_referenced(deleg_cur);
 945         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 946         ret = 1;
 947 no_delegation_unlock:
 948         spin_unlock(&deleg_cur->lock);
 949 no_delegation:
 950         rcu_read_unlock();
 951
 952         if (!ret && open_stateid != NULL) {
 953                 __update_open_stateid(state, open_stateid, NULL, fmode);
 954                 ret = 1;
 955         }
 956
 957         return ret;
 958 }
 959
 960
 961 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 962 {
 963         struct nfs_delegation *delegation;
 964
 965         rcu_read_lock();
 966         delegation = rcu_dereference(NFS_I(inode)->delegation);
 967         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 968                 rcu_read_unlock();
 969                 return;
 970         }
 971         rcu_read_unlock();
 972         nfs4_inode_return_delegation(inode);
 973 }
 974
 975 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 976 {
 977         struct nfs4_state *state = opendata->state;
 978         struct nfs_inode *nfsi = NFS_I(state->inode);
 979         struct nfs_delegation *delegation;
 980         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
 981         fmode_t fmode = opendata->o_arg.fmode;
 982         nfs4_stateid stateid;
 983         int ret = -EAGAIN;
 984
 985         for (;;) {
 986                 if (can_open_cached(state, fmode, open_mode)) {
 987                         spin_lock(&state->owner->so_lock);
 988                         if (can_open_cached(state, fmode, open_mode)) {
 989                                 update_open_stateflags(state, fmode);
 990                                 spin_unlock(&state->owner->so_lock);
 991                                 goto out_return_state;
 992                         }
 993                         spin_unlock(&state->owner->so_lock);
 994                 }
 995                 rcu_read_lock();
 996                 delegation = rcu_dereference(nfsi->delegation);
 997                 if (!can_open_delegated(delegation, fmode)) {
 998                         rcu_read_unlock();
 999                         break;
1000                 }
1001                 /* Save the delegation */
1002                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1003                 rcu_read_unlock();
1004                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1005                 if (ret != 0)
1006                         goto out;
1007                 ret = -EAGAIN;
1008
1009                 /* Try to update the stateid using the delegation */
1010                 if (update_open_stateid(state, NULL, &stateid, fmode))
1011                         goto out_return_state;
1012         }
1013 out:
1014         return ERR_PTR(ret);
1015 out_return_state:
1016         atomic_inc(&state->count);
1017         return state;
1018 }
1019
1020 static void
1021 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1022 {
1023         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1024         struct nfs_delegation *delegation;
1025         int delegation_flags = 0;
1026
1027         rcu_read_lock();
1028         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1029         if (delegation)
1030                 delegation_flags = delegation->flags;
1031         rcu_read_unlock();
1032         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1033                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1034                                    "returning a delegation for "
1035                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1036                                    clp->cl_hostname);
1037         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1038                 nfs_inode_set_delegation(state->inode,
1039                                          data->owner->so_cred,
1040                                          &data->o_res);
1041         else
1042                 nfs_inode_reclaim_delegation(state->inode,
1043                                              data->owner->so_cred,
1044                                              &data->o_res);
1045 }
1046
1047 /*
1048  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1049  * and update the nfs4_state.
1050  */
1051 static struct nfs4_state *
1052 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1053 {
1054         struct inode *inode = data->state->inode;
1055         struct nfs4_state *state = data->state;
1056         int ret;
1057
1058         if (!data->rpc_done) {
1059                 ret = data->rpc_status;
1060                 goto err;
1061         }
1062
1063         ret = -ESTALE;
1064         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1065             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1066             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1067                 goto err;
1068
1069         ret = -ENOMEM;
1070         state = nfs4_get_open_state(inode, data->owner);
1071         if (state == NULL)
1072                 goto err;
1073
1074         ret = nfs_refresh_inode(inode, &data->f_attr);
1075         if (ret)
1076                 goto err;
1077
1078         if (data->o_res.delegation_type != 0)
1079                 nfs4_opendata_check_deleg(data, state);
1080         update_open_stateid(state, &data->o_res.stateid, NULL,
1081                             data->o_arg.fmode);
1082
1083         return state;
1084 err:
1085         return ERR_PTR(ret);
1086
1087 }
1088
1089 static struct nfs4_state *
1090 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1091 {
1092         struct inode *inode;
1093         struct nfs4_state *state = NULL;
1094         int ret;
1095
1096         if (!data->rpc_done) {
1097                 state = nfs4_try_open_cached(data);
1098                 goto out;
1099         }
1100
1101         ret = -EAGAIN;
1102         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1103                 goto err;
1104         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1105         ret = PTR_ERR(inode);
1106         if (IS_ERR(inode))
1107                 goto err;
1108         ret = -ENOMEM;
1109         state = nfs4_get_open_state(inode, data->owner);
1110         if (state == NULL)
1111                 goto err_put_inode;
1112         if (data->o_res.delegation_type != 0)
1113                 nfs4_opendata_check_deleg(data, state);
1114         update_open_stateid(state, &data->o_res.stateid, NULL,
1115                         data->o_arg.fmode);
1116         iput(inode);
1117 out:
1118         return state;
1119 err_put_inode:
1120         iput(inode);
1121 err:
1122         return ERR_PTR(ret);
1123 }
1124
1125 static struct nfs4_state *
1126 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1127 {
1128         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1129                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1130         return _nfs4_opendata_to_nfs4_state(data);
1131 }
1132
1133 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1134 {
1135         struct nfs_inode *nfsi = NFS_I(state->inode);
1136         struct nfs_open_context *ctx;
1137
1138         spin_lock(&state->inode->i_lock);
1139         list_for_each_entry(ctx, &nfsi->open_files, list) {
1140                 if (ctx->state != state)
1141                         continue;
1142                 get_nfs_open_context(ctx);
1143                 spin_unlock(&state->inode->i_lock);
1144                 return ctx;
1145         }
1146         spin_unlock(&state->inode->i_lock);
1147         return ERR_PTR(-ENOENT);
1148 }
1149
1150 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1151 {
1152         struct nfs4_opendata *opendata;
1153
1154         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1155         if (opendata == NULL)
1156                 return ERR_PTR(-ENOMEM);
1157         opendata->state = state;
1158         atomic_inc(&state->count);
1159         return opendata;
1160 }
1161
1162 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1163 {
1164         struct nfs4_state *newstate;
1165         int ret;
1166
1167         opendata->o_arg.open_flags = 0;
1168         opendata->o_arg.fmode = fmode;
1169         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1170         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1171         nfs4_init_opendata_res(opendata);
1172         ret = _nfs4_recover_proc_open(opendata);
1173         if (ret != 0)
1174                 return ret;
1175         newstate = nfs4_opendata_to_nfs4_state(opendata);
1176         if (IS_ERR(newstate))
1177                 return PTR_ERR(newstate);
1178         nfs4_close_state(newstate, fmode);
1179         *res = newstate;
1180         return 0;
1181 }
1182
1183 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1184 {
1185         struct nfs4_state *newstate;
1186         int ret;
1187
1188         /* memory barrier prior to reading state->n_* */
1189         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1190         smp_rmb();
1191         if (state->n_rdwr != 0) {
1192                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1193                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1194                 if (ret != 0)
1195                         return ret;
1196                 if (newstate != state)
1197                         return -ESTALE;
1198         }
1199         if (state->n_wronly != 0) {
1200                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1201                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1202                 if (ret != 0)
1203                         return ret;
1204                 if (newstate != state)
1205                         return -ESTALE;
1206         }
1207         if (state->n_rdonly != 0) {
1208                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1209                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1210                 if (ret != 0)
1211                         return ret;
1212                 if (newstate != state)
1213                         return -ESTALE;
1214         }
1215         /*
1216          * We may have performed cached opens for all three recoveries.
1217          * Check if we need to update the current stateid.
1218          */
1219         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1220             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1221                 write_seqlock(&state->seqlock);
1222                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1223                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1224                 write_sequnlock(&state->seqlock);
1225         }
1226         return 0;
1227 }
1228
1229 /*
1230  * OPEN_RECLAIM:
1231  *      reclaim state on the server after a reboot.
1232  */
1233 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1234 {
1235         struct nfs_delegation *delegation;
1236         struct nfs4_opendata *opendata;
1237         fmode_t delegation_type = 0;
1238         int status;
1239
1240         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1241         if (IS_ERR(opendata))
1242                 return PTR_ERR(opendata);
1243         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1244         opendata->o_arg.fh = NFS_FH(state->inode);
1245         rcu_read_lock();
1246         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1247         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1248                 delegation_type = delegation->type;
1249         rcu_read_unlock();
1250         opendata->o_arg.u.delegation_type = delegation_type;
1251         status = nfs4_open_recover(opendata, state);
1252         nfs4_opendata_put(opendata);
1253         return status;
1254 }
1255
1256 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1257 {
1258         struct nfs_server *server = NFS_SERVER(state->inode);
1259         struct nfs4_exception exception = { };
1260         int err;
1261         do {
1262                 err = _nfs4_do_open_reclaim(ctx, state);
1263                 if (err != -NFS4ERR_DELAY)
1264                         break;
1265                 nfs4_handle_exception(server, err, &exception);
1266         } while (exception.retry);
1267         return err;
1268 }
1269
1270 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1271 {
1272         struct nfs_open_context *ctx;
1273         int ret;
1274
1275         ctx = nfs4_state_find_open_context(state);
1276         if (IS_ERR(ctx))
1277                 return PTR_ERR(ctx);
1278         ret = nfs4_do_open_reclaim(ctx, state);
1279         put_nfs_open_context(ctx);
1280         return ret;
1281 }
1282
1283 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1284 {
1285         struct nfs4_opendata *opendata;
1286         int ret;
1287
1288         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1289         if (IS_ERR(opendata))
1290                 return PTR_ERR(opendata);
1291         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1292         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1293         ret = nfs4_open_recover(opendata, state);
1294         nfs4_opendata_put(opendata);
1295         return ret;
1296 }
1297
1298 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1299 {
1300         struct nfs4_exception exception = { };
1301         struct nfs_server *server = NFS_SERVER(state->inode);
1302         int err;
1303         do {
1304                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1305                 switch (err) {
1306                         case 0:
1307                         case -ENOENT:
1308                         case -ESTALE:
1309                                 goto out;
1310                         case -NFS4ERR_BADSESSION:
1311                         case -NFS4ERR_BADSLOT:
1312                         case -NFS4ERR_BAD_HIGH_SLOT:
1313                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1314                         case -NFS4ERR_DEADSESSION:
1315                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1316                                 goto out;
1317                         case -NFS4ERR_STALE_CLIENTID:
1318                         case -NFS4ERR_STALE_STATEID:
1319                         case -NFS4ERR_EXPIRED:
1320                                 /* Don't recall a delegation if it was lost */
1321                                 nfs4_schedule_lease_recovery(server->nfs_client);
1322                                 goto out;
1323                         case -ERESTARTSYS:
1324                                 /*
1325                                  * The show must go on: exit, but mark the
1326                                  * stateid as needing recovery.
1327                                  */
1328                         case -NFS4ERR_DELEG_REVOKED:
1329                         case -NFS4ERR_ADMIN_REVOKED:
1330                         case -NFS4ERR_BAD_STATEID:
1331                                 nfs_inode_find_state_and_recover(state->inode,
1332                                                 stateid);
1333                                 nfs4_schedule_stateid_recovery(server, state);
1334                         case -EKEYEXPIRED:
1335                                 /*
1336                                  * User RPCSEC_GSS context has expired.
1337                                  * We cannot recover this stateid now, so
1338                                  * skip it and allow recovery thread to
1339                                  * proceed.
1340                                  */
1341                         case -ENOMEM:
1342                                 err = 0;
1343                                 goto out;
1344                 }
1345                 err = nfs4_handle_exception(server, err, &exception);
1346         } while (exception.retry);
1347 out:
1348         return err;
1349 }
1350
1351 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1352 {
1353         struct nfs4_opendata *data = calldata;
1354
1355         data->rpc_status = task->tk_status;
1356         if (data->rpc_status == 0) {
1357                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1358                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1359                 renew_lease(data->o_res.server, data->timestamp);
1360                 data->rpc_done = 1;
1361         }
1362 }
1363
1364 static void nfs4_open_confirm_release(void *calldata)
1365 {
1366         struct nfs4_opendata *data = calldata;
1367         struct nfs4_state *state = NULL;
1368
1369         /* If this request hasn't been cancelled, do nothing */
1370         if (data->cancelled == 0)
1371                 goto out_free;
1372         /* In case of error, no cleanup! */
1373         if (!data->rpc_done)
1374                 goto out_free;
1375         state = nfs4_opendata_to_nfs4_state(data);
1376         if (!IS_ERR(state))
1377                 nfs4_close_state(state, data->o_arg.fmode);
1378 out_free:
1379         nfs4_opendata_put(data);
1380 }
1381
1382 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1383         .rpc_call_done = nfs4_open_confirm_done,
1384         .rpc_release = nfs4_open_confirm_release,
1385 };
1386
1387 /*
1388  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1389  */
1390 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1391 {
1392         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1393         struct rpc_task *task;
1394         struct  rpc_message msg = {
1395                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1396                 .rpc_argp = &data->c_arg,
1397                 .rpc_resp = &data->c_res,
1398                 .rpc_cred = data->owner->so_cred,
1399         };
1400         struct rpc_task_setup task_setup_data = {
1401                 .rpc_client = server->client,
1402                 .rpc_message = &msg,
1403                 .callback_ops = &nfs4_open_confirm_ops,
1404                 .callback_data = data,
1405                 .workqueue = nfsiod_workqueue,
1406                 .flags = RPC_TASK_ASYNC,
1407         };
1408         int status;
1409
1410         kref_get(&data->kref);
1411         data->rpc_done = 0;
1412         data->rpc_status = 0;
1413         data->timestamp = jiffies;
1414         task = rpc_run_task(&task_setup_data);
1415         if (IS_ERR(task))
1416                 return PTR_ERR(task);
1417         status = nfs4_wait_for_completion_rpc_task(task);
1418         if (status != 0) {
1419                 data->cancelled = 1;
1420                 smp_wmb();
1421         } else
1422                 status = data->rpc_status;
1423         rpc_put_task(task);
1424         return status;
1425 }
1426
1427 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1428 {
1429         struct nfs4_opendata *data = calldata;
1430         struct nfs4_state_owner *sp = data->owner;
1431
1432         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1433                 return;
1434         /*
1435          * Check if we still need to send an OPEN call, or if we can use
1436          * a delegation instead.
1437          */
1438         if (data->state != NULL) {
1439                 struct nfs_delegation *delegation;
1440
1441                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1442                         goto out_no_action;
1443                 rcu_read_lock();
1444                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1445                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1446                     can_open_delegated(delegation, data->o_arg.fmode))
1447                         goto unlock_no_action;
1448                 rcu_read_unlock();
1449         }
1450         /* Update client id. */
1451         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1452         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1453                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1454                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1455                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1456         }
1457         data->timestamp = jiffies;
1458         if (nfs4_setup_sequence(data->o_arg.server,
1459                                 &data->o_arg.seq_args,
1460                                 &data->o_res.seq_res,
1461                                 task) != 0)
1462                 nfs_release_seqid(data->o_arg.seqid);
1463         return;
1464 unlock_no_action:
1465         rcu_read_unlock();
1466 out_no_action:
1467         task->tk_action = NULL;
1468 }
1469
1470 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1471 {
1472         struct nfs4_opendata *data = calldata;
1473
1474         data->rpc_status = task->tk_status;
1475
1476         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1477                 return;
1478
1479         if (task->tk_status == 0) {
1480                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1481                         switch (data->o_res.f_attr->mode & S_IFMT) {
1482                         case S_IFREG:
1483                                 break;
1484                         case S_IFLNK:
1485                                 data->rpc_status = -ELOOP;
1486                                 break;
1487                         case S_IFDIR:
1488                                 data->rpc_status = -EISDIR;
1489                                 break;
1490                         default:
1491                                 data->rpc_status = -ENOTDIR;
1492                         }
1493                 }
1494                 renew_lease(data->o_res.server, data->timestamp);
1495                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1496                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1497         }
1498         data->rpc_done = 1;
1499 }
1500
1501 static void nfs4_open_release(void *calldata)
1502 {
1503         struct nfs4_opendata *data = calldata;
1504         struct nfs4_state *state = NULL;
1505
1506         /* If this request hasn't been cancelled, do nothing */
1507         if (data->cancelled == 0)
1508                 goto out_free;
1509         /* In case of error, no cleanup! */
1510         if (data->rpc_status != 0 || !data->rpc_done)
1511                 goto out_free;
1512         /* In case we need an open_confirm, no cleanup! */
1513         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1514                 goto out_free;
1515         state = nfs4_opendata_to_nfs4_state(data);
1516         if (!IS_ERR(state))
1517                 nfs4_close_state(state, data->o_arg.fmode);
1518 out_free:
1519         nfs4_opendata_put(data);
1520 }
1521
1522 static const struct rpc_call_ops nfs4_open_ops = {
1523         .rpc_call_prepare = nfs4_open_prepare,
1524         .rpc_call_done = nfs4_open_done,
1525         .rpc_release = nfs4_open_release,
1526 };
1527
1528 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1529 {
1530         struct inode *dir = data->dir->d_inode;
1531         struct nfs_server *server = NFS_SERVER(dir);
1532         struct nfs_openargs *o_arg = &data->o_arg;
1533         struct nfs_openres *o_res = &data->o_res;
1534         struct rpc_task *task;
1535         struct rpc_message msg = {
1536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1537                 .rpc_argp = o_arg,
1538                 .rpc_resp = o_res,
1539                 .rpc_cred = data->owner->so_cred,
1540         };
1541         struct rpc_task_setup task_setup_data = {
1542                 .rpc_client = server->client,
1543                 .rpc_message = &msg,
1544                 .callback_ops = &nfs4_open_ops,
1545                 .callback_data = data,
1546                 .workqueue = nfsiod_workqueue,
1547                 .flags = RPC_TASK_ASYNC,
1548         };
1549         int status;
1550
1551         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1552         kref_get(&data->kref);
1553         data->rpc_done = 0;
1554         data->rpc_status = 0;
1555         data->cancelled = 0;
1556         if (isrecover)
1557                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1558         task = rpc_run_task(&task_setup_data);
1559         if (IS_ERR(task))
1560                 return PTR_ERR(task);
1561         status = nfs4_wait_for_completion_rpc_task(task);
1562         if (status != 0) {
1563                 data->cancelled = 1;
1564                 smp_wmb();
1565         } else
1566                 status = data->rpc_status;
1567         rpc_put_task(task);
1568
1569         return status;
1570 }
1571
1572 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1573 {
1574         struct inode *dir = data->dir->d_inode;
1575         struct nfs_openres *o_res = &data->o_res;
1576         int status;
1577
1578         status = nfs4_run_open_task(data, 1);
1579         if (status != 0 || !data->rpc_done)
1580                 return status;
1581
1582         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1583
1584         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1585                 status = _nfs4_proc_open_confirm(data);
1586                 if (status != 0)
1587                         return status;
1588         }
1589
1590         return status;
1591 }
1592
1593 static int nfs4_opendata_access(struct rpc_cred *cred,
1594                                 struct nfs4_opendata *opendata,
1595                                 struct nfs4_state *state, fmode_t fmode)
1596 {
1597         struct nfs_access_entry cache;
1598         u32 mask;
1599
1600         /* access call failed or for some reason the server doesn't
1601          * support any access modes -- defer access call until later */
1602         if (opendata->o_res.access_supported == 0)
1603                 return 0;
1604
1605         mask = 0;
1606         /* don't check MAY_WRITE - a newly created file may not have
1607          * write mode bits, but POSIX allows the creating process to write */
1608         if (fmode & FMODE_READ)
1609                 mask |= MAY_READ;
1610         if (fmode & FMODE_EXEC)
1611                 mask |= MAY_EXEC;
1612
1613         cache.cred = cred;
1614         cache.jiffies = jiffies;
1615         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1616         nfs_access_add_cache(state->inode, &cache);
1617
1618         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1619                 return 0;
1620
1621         /* even though OPEN succeeded, access is denied. Close the file */
1622         nfs4_close_state(state, fmode);
1623         return -EACCES;
1624 }
1625
1626 /*
1627  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1628  */
1629 static int _nfs4_proc_open(struct nfs4_opendata *data)
1630 {
1631         struct inode *dir = data->dir->d_inode;
1632         struct nfs_server *server = NFS_SERVER(dir);
1633         struct nfs_openargs *o_arg = &data->o_arg;
1634         struct nfs_openres *o_res = &data->o_res;
1635         int status;
1636
1637         status = nfs4_run_open_task(data, 0);
1638         if (!data->rpc_done)
1639                 return status;
1640         if (status != 0) {
1641                 if (status == -NFS4ERR_BADNAME &&
1642                                 !(o_arg->open_flags & O_CREAT))
1643                         return -ENOENT;
1644                 return status;
1645         }
1646
1647         nfs_fattr_map_and_free_names(server, &data->f_attr);
1648
1649         if (o_arg->open_flags & O_CREAT)
1650                 update_changeattr(dir, &o_res->cinfo);
1651         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1652                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1653         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1654                 status = _nfs4_proc_open_confirm(data);
1655                 if (status != 0)
1656                         return status;
1657         }
1658         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1659                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1660         return 0;
1661 }
1662
1663 static int nfs4_recover_expired_lease(struct nfs_server *server)
1664 {
1665         return nfs4_client_recover_expired_lease(server->nfs_client);
1666 }
1667
1668 /*
1669  * OPEN_EXPIRED:
1670  *      reclaim state on the server after a network partition.
1671  *      Assumes caller holds the appropriate lock
1672  */
1673 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1674 {
1675         struct nfs4_opendata *opendata;
1676         int ret;
1677
1678         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1679         if (IS_ERR(opendata))
1680                 return PTR_ERR(opendata);
1681         ret = nfs4_open_recover(opendata, state);
1682         if (ret == -ESTALE)
1683                 d_drop(ctx->dentry);
1684         nfs4_opendata_put(opendata);
1685         return ret;
1686 }
1687
1688 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1689 {
1690         struct nfs_server *server = NFS_SERVER(state->inode);
1691         struct nfs4_exception exception = { };
1692         int err;
1693
1694         do {
1695                 err = _nfs4_open_expired(ctx, state);
1696                 switch (err) {
1697                 default:
1698                         goto out;
1699                 case -NFS4ERR_GRACE:
1700                 case -NFS4ERR_DELAY:
1701                         nfs4_handle_exception(server, err, &exception);
1702                         err = 0;
1703                 }
1704         } while (exception.retry);
1705 out:
1706         return err;
1707 }
1708
1709 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1710 {
1711         struct nfs_open_context *ctx;
1712         int ret;
1713
1714         ctx = nfs4_state_find_open_context(state);
1715         if (IS_ERR(ctx))
1716                 return PTR_ERR(ctx);
1717         ret = nfs4_do_open_expired(ctx, state);
1718         put_nfs_open_context(ctx);
1719         return ret;
1720 }
1721
1722 #if defined(CONFIG_NFS_V4_1)
1723 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1724 {
1725         struct nfs_server *server = NFS_SERVER(state->inode);
1726         nfs4_stateid *stateid = &state->stateid;
1727         int status;
1728
1729         /* If a state reset has been done, test_stateid is unneeded */
1730         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1731                 return;
1732
1733         status = nfs41_test_stateid(server, stateid);
1734         if (status != NFS_OK) {
1735                 /* Free the stateid unless the server explicitly
1736                  * informs us the stateid is unrecognized. */
1737                 if (status != -NFS4ERR_BAD_STATEID)
1738                         nfs41_free_stateid(server, stateid);
1739                 nfs_remove_bad_delegation(state->inode);
1740
1741                 write_seqlock(&state->seqlock);
1742                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1743                 write_sequnlock(&state->seqlock);
1744                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1745         }
1746 }
1747
1748 /**
1749  * nfs41_check_open_stateid - possibly free an open stateid
1750  *
1751  * @state: NFSv4 state for an inode
1752  *
1753  * Returns NFS_OK if recovery for this stateid is now finished.
1754  * Otherwise a negative NFS4ERR value is returned.
1755  */
1756 static int nfs41_check_open_stateid(struct nfs4_state *state)
1757 {
1758         struct nfs_server *server = NFS_SERVER(state->inode);
1759         nfs4_stateid *stateid = &state->open_stateid;
1760         int status;
1761
1762         /* If a state reset has been done, test_stateid is unneeded */
1763         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1764             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1765             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1766                 return -NFS4ERR_BAD_STATEID;
1767
1768         status = nfs41_test_stateid(server, stateid);
1769         if (status != NFS_OK) {
1770                 /* Free the stateid unless the server explicitly
1771                  * informs us the stateid is unrecognized. */
1772                 if (status != -NFS4ERR_BAD_STATEID)
1773                         nfs41_free_stateid(server, stateid);
1774
1775                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1776                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1777                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1778         }
1779         return status;
1780 }
1781
1782 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1783 {
1784         int status;
1785
1786         nfs41_clear_delegation_stateid(state);
1787         status = nfs41_check_open_stateid(state);
1788         if (status != NFS_OK)
1789                 status = nfs4_open_expired(sp, state);
1790         return status;
1791 }
1792 #endif
1793
1794 /*
1795  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1796  * fields corresponding to attributes that were used to store the verifier.
1797  * Make sure we clobber those fields in the later setattr call
1798  */
1799 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1800 {
1801         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1802             !(sattr->ia_valid & ATTR_ATIME_SET))
1803                 sattr->ia_valid |= ATTR_ATIME;
1804
1805         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1806             !(sattr->ia_valid & ATTR_MTIME_SET))
1807                 sattr->ia_valid |= ATTR_MTIME;
1808 }
1809
1810 /*
1811  * Returns a referenced nfs4_state
1812  */
1813 static int _nfs4_do_open(struct inode *dir,
1814                         struct dentry *dentry,
1815                         fmode_t fmode,
1816                         int flags,
1817                         struct iattr *sattr,
1818                         struct rpc_cred *cred,
1819                         struct nfs4_state **res,
1820                         struct nfs4_threshold **ctx_th)
1821 {
1822         struct nfs4_state_owner  *sp;
1823         struct nfs4_state     *state = NULL;
1824         struct nfs_server       *server = NFS_SERVER(dir);
1825         struct nfs4_opendata *opendata;
1826         int status;
1827
1828         /* Protect against reboot recovery conflicts */
1829         status = -ENOMEM;
1830         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1831         if (sp == NULL) {
1832                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1833                 goto out_err;
1834         }
1835         status = nfs4_recover_expired_lease(server);
1836         if (status != 0)
1837                 goto err_put_state_owner;
1838         if (dentry->d_inode != NULL)
1839                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1840         status = -ENOMEM;
1841         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1842         if (opendata == NULL)
1843                 goto err_put_state_owner;
1844
1845         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1846                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1847                 if (!opendata->f_attr.mdsthreshold)
1848                         goto err_opendata_put;
1849                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1850         }
1851         if (dentry->d_inode != NULL)
1852                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1853
1854         status = _nfs4_proc_open(opendata);
1855         if (status != 0)
1856                 goto err_opendata_put;
1857
1858         state = nfs4_opendata_to_nfs4_state(opendata);
1859         status = PTR_ERR(state);
1860         if (IS_ERR(state))
1861                 goto err_opendata_put;
1862         if (server->caps & NFS_CAP_POSIX_LOCK)
1863                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1864
1865         status = nfs4_opendata_access(cred, opendata, state, fmode);
1866         if (status != 0)
1867                 goto err_opendata_put;
1868
1869         if (opendata->o_arg.open_flags & O_EXCL) {
1870                 nfs4_exclusive_attrset(opendata, sattr);
1871
1872                 nfs_fattr_init(opendata->o_res.f_attr);
1873                 status = nfs4_do_setattr(state->inode, cred,
1874                                 opendata->o_res.f_attr, sattr,
1875                                 state);
1876                 if (status == 0)
1877                         nfs_setattr_update_inode(state->inode, sattr);
1878                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1879         }
1880
1881         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1882                 *ctx_th = opendata->f_attr.mdsthreshold;
1883         else
1884                 kfree(opendata->f_attr.mdsthreshold);
1885         opendata->f_attr.mdsthreshold = NULL;
1886
1887         nfs4_opendata_put(opendata);
1888         nfs4_put_state_owner(sp);
1889         *res = state;
1890         return 0;
1891 err_opendata_put:
1892         kfree(opendata->f_attr.mdsthreshold);
1893         nfs4_opendata_put(opendata);
1894 err_put_state_owner:
1895         nfs4_put_state_owner(sp);
1896 out_err:
1897         *res = NULL;
1898         return status;
1899 }
1900
1901
1902 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1903                                         struct dentry *dentry,
1904                                         fmode_t fmode,
1905                                         int flags,
1906                                         struct iattr *sattr,
1907                                         struct rpc_cred *cred,
1908                                         struct nfs4_threshold **ctx_th)
1909 {
1910         struct nfs4_exception exception = { };
1911         struct nfs4_state *res;
1912         int status;
1913
1914         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1915         do {
1916                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1917                                        &res, ctx_th);
1918                 if (status == 0)
1919                         break;
1920                 /* NOTE: BAD_SEQID means the server and client disagree about the
1921                  * book-keeping w.r.t. state-changing operations
1922                  * (OPEN/CLOSE/LOCK/LOCKU...)
1923                  * It is actually a sign of a bug on the client or on the server.
1924                  *
1925                  * If we receive a BAD_SEQID error in the particular case of
1926                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1927                  * have unhashed the old state_owner for us, and that we can
1928                  * therefore safely retry using a new one. We should still warn
1929                  * the user though...
1930                  */
1931                 if (status == -NFS4ERR_BAD_SEQID) {
1932                         pr_warn_ratelimited("NFS: v4 server %s "
1933                                         " returned a bad sequence-id error!\n",
1934                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1935                         exception.retry = 1;
1936                         continue;
1937                 }
1938                 /*
1939                  * BAD_STATEID on OPEN means that the server cancelled our
1940                  * state before it received the OPEN_CONFIRM.
1941                  * Recover by retrying the request as per the discussion
1942                  * on Page 181 of RFC3530.
1943                  */
1944                 if (status == -NFS4ERR_BAD_STATEID) {
1945                         exception.retry = 1;
1946                         continue;
1947                 }
1948                 if (status == -EAGAIN) {
1949                         /* We must have found a delegation */
1950                         exception.retry = 1;
1951                         continue;
1952                 }
1953                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1954                                         status, &exception));
1955         } while (exception.retry);
1956         return res;
1957 }
1958
1959 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1960                             struct nfs_fattr *fattr, struct iattr *sattr,
1961                             struct nfs4_state *state)
1962 {
1963         struct nfs_server *server = NFS_SERVER(inode);
1964         struct nfs_setattrargs  arg = {
1965                 .fh             = NFS_FH(inode),
1966                 .iap            = sattr,
1967                 .server         = server,
1968                 .bitmask = server->attr_bitmask,
1969         };
1970         struct nfs_setattrres  res = {
1971                 .fattr          = fattr,
1972                 .server         = server,
1973         };
1974         struct rpc_message msg = {
1975                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1976                 .rpc_argp       = &arg,
1977                 .rpc_resp       = &res,
1978                 .rpc_cred       = cred,
1979         };
1980         unsigned long timestamp = jiffies;
1981         int status;
1982
1983         nfs_fattr_init(fattr);
1984
1985         if (state != NULL) {
1986                 struct nfs_lockowner lockowner = {
1987                         .l_owner = current->files,
1988                         .l_pid = current->tgid,
1989                 };
1990                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1991                                 &lockowner);
1992         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1993                                 FMODE_WRITE)) {
1994                 /* Use that stateid */
1995         } else
1996                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1997
1998         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1999         if (status == 0 && state != NULL)
2000                 renew_lease(server, timestamp);
2001         return status;
2002 }
2003
2004 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2005                            struct nfs_fattr *fattr, struct iattr *sattr,
2006                            struct nfs4_state *state)
2007 {
2008         struct nfs_server *server = NFS_SERVER(inode);
2009         struct nfs4_exception exception = {
2010                 .state = state,
2011                 .inode = inode,
2012         };
2013         int err;
2014         do {
2015                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2016                 switch (err) {
2017                 case -NFS4ERR_OPENMODE:
2018                         if (state && !(state->state & FMODE_WRITE)) {
2019                                 err = -EBADF;
2020                                 if (sattr->ia_valid & ATTR_OPEN)
2021                                         err = -EACCES;
2022                                 goto out;
2023                         }
2024                 }
2025                 err = nfs4_handle_exception(server, err, &exception);
2026         } while (exception.retry);
2027 out:
2028         return err;
2029 }
2030
2031 struct nfs4_closedata {
2032         struct inode *inode;
2033         struct nfs4_state *state;
2034         struct nfs_closeargs arg;
2035         struct nfs_closeres res;
2036         struct nfs_fattr fattr;
2037         unsigned long timestamp;
2038         bool roc;
2039         u32 roc_barrier;
2040 };
2041
2042 static void nfs4_free_closedata(void *data)
2043 {
2044         struct nfs4_closedata *calldata = data;
2045         struct nfs4_state_owner *sp = calldata->state->owner;
2046         struct super_block *sb = calldata->state->inode->i_sb;
2047
2048         if (calldata->roc)
2049                 pnfs_roc_release(calldata->state->inode);
2050         nfs4_put_open_state(calldata->state);
2051         nfs_free_seqid(calldata->arg.seqid);
2052         nfs4_put_state_owner(sp);
2053         nfs_sb_deactive_async(sb);
2054         kfree(calldata);
2055 }
2056
2057 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2058                 fmode_t fmode)
2059 {
2060         spin_lock(&state->owner->so_lock);
2061         if (!(fmode & FMODE_READ))
2062                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2063         if (!(fmode & FMODE_WRITE))
2064                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2065         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2066         spin_unlock(&state->owner->so_lock);
2067 }
2068
2069 static void nfs4_close_done(struct rpc_task *task, void *data)
2070 {
2071         struct nfs4_closedata *calldata = data;
2072         struct nfs4_state *state = calldata->state;
2073         struct nfs_server *server = NFS_SERVER(calldata->inode);
2074
2075         dprintk("%s: begin!\n", __func__);
2076         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2077                 return;
2078         /* hmm. we are done with the inode, and in the process of freeing
2079          * the state_owner. we keep this around to process errors
2080          */
2081         switch (task->tk_status) {
2082                 case 0:
2083                         if (calldata->roc)
2084                                 pnfs_roc_set_barrier(state->inode,
2085                                                      calldata->roc_barrier);
2086                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2087                         renew_lease(server, calldata->timestamp);
2088                         nfs4_close_clear_stateid_flags(state,
2089                                         calldata->arg.fmode);
2090                         break;
2091                 case -NFS4ERR_STALE_STATEID:
2092                 case -NFS4ERR_OLD_STATEID:
2093                 case -NFS4ERR_BAD_STATEID:
2094                 case -NFS4ERR_EXPIRED:
2095                         if (calldata->arg.fmode == 0)
2096                                 break;
2097                 default:
2098                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2099                                 rpc_restart_call_prepare(task);
2100         }
2101         nfs_release_seqid(calldata->arg.seqid);
2102         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2103         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2104 }
2105
2106 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2107 {
2108         struct nfs4_closedata *calldata = data;
2109         struct nfs4_state *state = calldata->state;
2110         struct inode *inode = calldata->inode;
2111         int call_close = 0;
2112
2113         dprintk("%s: begin!\n", __func__);
2114         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2115                 return;
2116
2117         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2118         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2119         spin_lock(&state->owner->so_lock);
2120         /* Calculate the change in open mode */
2121         if (state->n_rdwr == 0) {
2122                 if (state->n_rdonly == 0) {
2123                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2124                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2125                         calldata->arg.fmode &= ~FMODE_READ;
2126                 }
2127                 if (state->n_wronly == 0) {
2128                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2129                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2130                         calldata->arg.fmode &= ~FMODE_WRITE;
2131                 }
2132         }
2133         spin_unlock(&state->owner->so_lock);
2134
2135         if (!call_close) {
2136                 /* Note: exit _without_ calling nfs4_close_done */
2137                 task->tk_action = NULL;
2138                 goto out;
2139         }
2140
2141         if (calldata->arg.fmode == 0) {
2142                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2143                 if (calldata->roc &&
2144                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2145                         goto out;
2146         }
2147
2148         nfs_fattr_init(calldata->res.fattr);
2149         calldata->timestamp = jiffies;
2150         if (nfs4_setup_sequence(NFS_SERVER(inode),
2151                                 &calldata->arg.seq_args,
2152                                 &calldata->res.seq_res,
2153                                 task) != 0)
2154                 nfs_release_seqid(calldata->arg.seqid);
2155 out:
2156         dprintk("%s: done!\n", __func__);
2157 }
2158
2159 static const struct rpc_call_ops nfs4_close_ops = {
2160         .rpc_call_prepare = nfs4_close_prepare,
2161         .rpc_call_done = nfs4_close_done,
2162         .rpc_release = nfs4_free_closedata,
2163 };
2164
2165 /*
2166  * It is possible for data to be read/written from a mem-mapped file
2167  * after the sys_close call (which hits the vfs layer as a flush).
2168  * This means that we can't safely call nfsv4 close on a file until
2169  * the inode is cleared. This in turn means that we are not good
2170  * NFSv4 citizens - we do not indicate to the server to update the file's
2171  * share state even when we are done with one of the three share
2172  * stateid's in the inode.
2173  *
2174  * NOTE: Caller must be holding the sp->so_owner semaphore!
2175  */
2176 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2177 {
2178         struct nfs_server *server = NFS_SERVER(state->inode);
2179         struct nfs4_closedata *calldata;
2180         struct nfs4_state_owner *sp = state->owner;
2181         struct rpc_task *task;
2182         struct rpc_message msg = {
2183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2184                 .rpc_cred = state->owner->so_cred,
2185         };
2186         struct rpc_task_setup task_setup_data = {
2187                 .rpc_client = server->client,
2188                 .rpc_message = &msg,
2189                 .callback_ops = &nfs4_close_ops,
2190                 .workqueue = nfsiod_workqueue,
2191                 .flags = RPC_TASK_ASYNC,
2192         };
2193         int status = -ENOMEM;
2194
2195         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2196         if (calldata == NULL)
2197                 goto out;
2198         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2199         calldata->inode = state->inode;
2200         calldata->state = state;
2201         calldata->arg.fh = NFS_FH(state->inode);
2202         calldata->arg.stateid = &state->open_stateid;
2203         /* Serialization for the sequence id */
2204         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2205         if (calldata->arg.seqid == NULL)
2206                 goto out_free_calldata;
2207         calldata->arg.fmode = 0;
2208         calldata->arg.bitmask = server->cache_consistency_bitmask;
2209         calldata->res.fattr = &calldata->fattr;
2210         calldata->res.seqid = calldata->arg.seqid;
2211         calldata->res.server = server;
2212         calldata->roc = pnfs_roc(state->inode);
2213         nfs_sb_active(calldata->inode->i_sb);
2214
2215         msg.rpc_argp = &calldata->arg;
2216         msg.rpc_resp = &calldata->res;
2217         task_setup_data.callback_data = calldata;
2218         task = rpc_run_task(&task_setup_data);
2219         if (IS_ERR(task))
2220                 return PTR_ERR(task);
2221         status = 0;
2222         if (wait)
2223                 status = rpc_wait_for_completion_task(task);
2224         rpc_put_task(task);
2225         return status;
2226 out_free_calldata:
2227         kfree(calldata);
2228 out:
2229         nfs4_put_open_state(state);
2230         nfs4_put_state_owner(sp);
2231         return status;
2232 }
2233
2234 static struct inode *
2235 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2236 {
2237         struct nfs4_state *state;
2238
2239         /* Protect against concurrent sillydeletes */
2240         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2241                              ctx->cred, &ctx->mdsthreshold);
2242         if (IS_ERR(state))
2243                 return ERR_CAST(state);
2244         ctx->state = state;
2245         return igrab(state->inode);
2246 }
2247
2248 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2249 {
2250         if (ctx->state == NULL)
2251                 return;
2252         if (is_sync)
2253                 nfs4_close_sync(ctx->state, ctx->mode);
2254         else
2255                 nfs4_close_state(ctx->state, ctx->mode);
2256 }
2257
2258 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2259 {
2260         struct nfs4_server_caps_arg args = {
2261                 .fhandle = fhandle,
2262         };
2263         struct nfs4_server_caps_res res = {};
2264         struct rpc_message msg = {
2265                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2266                 .rpc_argp = &args,
2267                 .rpc_resp = &res,
2268         };
2269         int status;
2270
2271         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2272         if (status == 0) {
2273                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2274                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2275                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2276                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2277                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2278                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2279                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2280                         server->caps |= NFS_CAP_ACLS;
2281                 if (res.has_links != 0)
2282                         server->caps |= NFS_CAP_HARDLINKS;
2283                 if (res.has_symlinks != 0)
2284                         server->caps |= NFS_CAP_SYMLINKS;
2285                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2286                         server->caps |= NFS_CAP_FILEID;
2287                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2288                         server->caps |= NFS_CAP_MODE;
2289                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2290                         server->caps |= NFS_CAP_NLINK;
2291                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2292                         server->caps |= NFS_CAP_OWNER;
2293                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2294                         server->caps |= NFS_CAP_OWNER_GROUP;
2295                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2296                         server->caps |= NFS_CAP_ATIME;
2297                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2298                         server->caps |= NFS_CAP_CTIME;
2299                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2300                         server->caps |= NFS_CAP_MTIME;
2301
2302                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2303                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2304                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2305                 server->acl_bitmask = res.acl_bitmask;
2306                 server->fh_expire_type = res.fh_expire_type;
2307         }
2308
2309         return status;
2310 }
2311
2312 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2313 {
2314         struct nfs4_exception exception = { };
2315         int err;
2316         do {
2317                 err = nfs4_handle_exception(server,
2318                                 _nfs4_server_capabilities(server, fhandle),
2319                                 &exception);
2320         } while (exception.retry);
2321         return err;
2322 }
2323
2324 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2325                 struct nfs_fsinfo *info)
2326 {
2327         struct nfs4_lookup_root_arg args = {
2328                 .bitmask = nfs4_fattr_bitmap,
2329         };
2330         struct nfs4_lookup_res res = {
2331                 .server = server,
2332                 .fattr = info->fattr,
2333                 .fh = fhandle,
2334         };
2335         struct rpc_message msg = {
2336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2337                 .rpc_argp = &args,
2338                 .rpc_resp = &res,
2339         };
2340
2341         nfs_fattr_init(info->fattr);
2342         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2343 }
2344
2345 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2346                 struct nfs_fsinfo *info)
2347 {
2348         struct nfs4_exception exception = { };
2349         int err;
2350         do {
2351                 err = _nfs4_lookup_root(server, fhandle, info);
2352                 switch (err) {
2353                 case 0:
2354                 case -NFS4ERR_WRONGSEC:
2355                         goto out;
2356                 default:
2357                         err = nfs4_handle_exception(server, err, &exception);
2358                 }
2359         } while (exception.retry);
2360 out:
2361         return err;
2362 }
2363
2364 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2365                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2366 {
2367         struct rpc_auth *auth;
2368         int ret;
2369
2370         auth = rpcauth_create(flavor, server->client);
2371         if (IS_ERR(auth)) {
2372                 ret = -EIO;
2373                 goto out;
2374         }
2375         ret = nfs4_lookup_root(server, fhandle, info);
2376 out:
2377         return ret;
2378 }
2379
2380 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2381                               struct nfs_fsinfo *info)
2382 {
2383         int i, len, status = 0;
2384         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2385
2386         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2387         if (len < 0)
2388                 return len;
2389
2390         for (i = 0; i < len; i++) {
2391                 /* AUTH_UNIX is the default flavor if none was specified,
2392                  * thus has already been tried. */
2393                 if (flav_array[i] == RPC_AUTH_UNIX)
2394                         continue;
2395
2396                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2397                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2398                         continue;
2399                 break;
2400         }
2401         /*
2402          * -EACCESS could mean that the user doesn't have correct permissions
2403          * to access the mount.  It could also mean that we tried to mount
2404          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2405          * existing mount programs don't handle -EACCES very well so it should
2406          * be mapped to -EPERM instead.
2407          */
2408         if (status == -EACCES)
2409                 status = -EPERM;
2410         return status;
2411 }
2412
2413 /*
2414  * get the file handle for the "/" directory on the server
2415  */
2416 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2417                          struct nfs_fsinfo *info)
2418 {
2419         int minor_version = server->nfs_client->cl_minorversion;
2420         int status = nfs4_lookup_root(server, fhandle, info);
2421         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2422                 /*
2423                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2424                  * by nfs4_map_errors() as this function exits.
2425                  */
2426                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2427         if (status == 0)
2428                 status = nfs4_server_capabilities(server, fhandle);
2429         if (status == 0)
2430                 status = nfs4_do_fsinfo(server, fhandle, info);
2431         return nfs4_map_errors(status);
2432 }
2433
2434 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2435                               struct nfs_fsinfo *info)
2436 {
2437         int error;
2438         struct nfs_fattr *fattr = info->fattr;
2439
2440         error = nfs4_server_capabilities(server, mntfh);
2441         if (error < 0) {
2442                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2443                 return error;
2444         }
2445
2446         error = nfs4_proc_getattr(server, mntfh, fattr);
2447         if (error < 0) {
2448                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2449                 return error;
2450         }
2451
2452         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2453             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2454                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2455
2456         return error;
2457 }
2458
2459 /*
2460  * Get locations and (maybe) other attributes of a referral.
2461  * Note that we'll actually follow the referral later when
2462  * we detect fsid mismatch in inode revalidation
2463  */
2464 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2465                              const struct qstr *name, struct nfs_fattr *fattr,
2466                              struct nfs_fh *fhandle)
2467 {
2468         int status = -ENOMEM;
2469         struct page *page = NULL;
2470         struct nfs4_fs_locations *locations = NULL;
2471
2472         page = alloc_page(GFP_KERNEL);
2473         if (page == NULL)
2474                 goto out;
2475         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2476         if (locations == NULL)
2477                 goto out;
2478
2479         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2480         if (status != 0)
2481                 goto out;
2482         /* Make sure server returned a different fsid for the referral */
2483         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2484                 dprintk("%s: server did not return a different fsid for"
2485                         " a referral at %s\n", __func__, name->name);
2486                 status = -EIO;
2487                 goto out;
2488         }
2489         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2490         nfs_fixup_referral_attributes(&locations->fattr);
2491
2492         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2493         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2494         memset(fhandle, 0, sizeof(struct nfs_fh));
2495 out:
2496         if (page)
2497                 __free_page(page);
2498         kfree(locations);
2499         return status;
2500 }
2501
2502 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2503 {
2504         struct nfs4_getattr_arg args = {
2505                 .fh = fhandle,
2506                 .bitmask = server->attr_bitmask,
2507         };
2508         struct nfs4_getattr_res res = {
2509                 .fattr = fattr,
2510                 .server = server,
2511         };
2512         struct rpc_message msg = {
2513                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2514                 .rpc_argp = &args,
2515                 .rpc_resp = &res,
2516         };
2517
2518         nfs_fattr_init(fattr);
2519         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2520 }
2521
2522 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2523 {
2524         struct nfs4_exception exception = { };
2525         int err;
2526         do {
2527                 err = nfs4_handle_exception(server,
2528                                 _nfs4_proc_getattr(server, fhandle, fattr),
2529                                 &exception);
2530         } while (exception.retry);
2531         return err;
2532 }
2533
2534 /*
2535  * The file is not closed if it is opened due to the a request to change
2536  * the size of the file. The open call will not be needed once the
2537  * VFS layer lookup-intents are implemented.
2538  *
2539  * Close is called when the inode is destroyed.
2540  * If we haven't opened the file for O_WRONLY, we
2541  * need to in the size_change case to obtain a stateid.
2542  *
2543  * Got race?
2544  * Because OPEN is always done by name in nfsv4, it is
2545  * possible that we opened a different file by the same
2546  * name.  We can recognize this race condition, but we
2547  * can't do anything about it besides returning an error.
2548  *
2549  * This will be fixed with VFS changes (lookup-intent).
2550  */
2551 static int
2552 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2553                   struct iattr *sattr)
2554 {
2555         struct inode *inode = dentry->d_inode;
2556         struct rpc_cred *cred = NULL;
2557         struct nfs4_state *state = NULL;
2558         int status;
2559
2560         if (pnfs_ld_layoutret_on_setattr(inode))
2561                 pnfs_return_layout(inode);
2562
2563         nfs_fattr_init(fattr);
2564
2565         /* Deal with open(O_TRUNC) */
2566         if (sattr->ia_valid & ATTR_OPEN)
2567                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2568
2569         /* Optimization: if the end result is no change, don't RPC */
2570         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2571                 return 0;
2572
2573         /* Search for an existing open(O_WRITE) file */
2574         if (sattr->ia_valid & ATTR_FILE) {
2575                 struct nfs_open_context *ctx;
2576
2577                 ctx = nfs_file_open_context(sattr->ia_file);
2578                 if (ctx) {
2579                         cred = ctx->cred;
2580                         state = ctx->state;
2581                 }
2582         }
2583
2584         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2585         if (status == 0)
2586                 nfs_setattr_update_inode(inode, sattr);
2587         return status;
2588 }
2589
2590 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2591                 const struct qstr *name, struct nfs_fh *fhandle,
2592                 struct nfs_fattr *fattr)
2593 {
2594         struct nfs_server *server = NFS_SERVER(dir);
2595         int                    status;
2596         struct nfs4_lookup_arg args = {
2597                 .bitmask = server->attr_bitmask,
2598                 .dir_fh = NFS_FH(dir),
2599                 .name = name,
2600         };
2601         struct nfs4_lookup_res res = {
2602                 .server = server,
2603                 .fattr = fattr,
2604                 .fh = fhandle,
2605         };
2606         struct rpc_message msg = {
2607                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2608                 .rpc_argp = &args,
2609                 .rpc_resp = &res,
2610         };
2611
2612         nfs_fattr_init(fattr);
2613
2614         dprintk("NFS call  lookup %s\n", name->name);
2615         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2616         dprintk("NFS reply lookup: %d\n", status);
2617         return status;
2618 }
2619
2620 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2621 {
2622         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2623                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2624         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2625         fattr->nlink = 2;
2626 }
2627
2628 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2629                                    struct qstr *name, struct nfs_fh *fhandle,
2630                                    struct nfs_fattr *fattr)
2631 {
2632         struct nfs4_exception exception = { };
2633         struct rpc_clnt *client = *clnt;
2634         int err;
2635         do {
2636                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2637                 switch (err) {
2638                 case -NFS4ERR_BADNAME:
2639                         err = -ENOENT;
2640                         goto out;
2641                 case -NFS4ERR_MOVED:
2642                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2643                         goto out;
2644                 case -NFS4ERR_WRONGSEC:
2645                         err = -EPERM;
2646                         if (client != *clnt)
2647                                 goto out;
2648
2649                         client = nfs4_create_sec_client(client, dir, name);
2650                         if (IS_ERR(client))
2651                                 return PTR_ERR(client);
2652
2653                         exception.retry = 1;
2654                         break;
2655                 default:
2656                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2657                 }
2658         } while (exception.retry);
2659
2660 out:
2661         if (err == 0)
2662                 *clnt = client;
2663         else if (client != *clnt)
2664                 rpc_shutdown_client(client);
2665
2666         return err;
2667 }
2668
2669 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2670                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2671 {
2672         int status;
2673         struct rpc_clnt *client = NFS_CLIENT(dir);
2674
2675         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2676         if (client != NFS_CLIENT(dir)) {
2677                 rpc_shutdown_client(client);
2678                 nfs_fixup_secinfo_attributes(fattr);
2679         }
2680         return status;
2681 }
2682
2683 struct rpc_clnt *
2684 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2685                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2686 {
2687         int status;
2688         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2689
2690         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2691         if (status < 0) {
2692                 rpc_shutdown_client(client);
2693                 return ERR_PTR(status);
2694         }
2695         return client;
2696 }
2697
2698 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2699 {
2700         struct nfs_server *server = NFS_SERVER(inode);
2701         struct nfs4_accessargs args = {
2702                 .fh = NFS_FH(inode),
2703                 .bitmask = server->cache_consistency_bitmask,
2704         };
2705         struct nfs4_accessres res = {
2706                 .server = server,
2707         };
2708         struct rpc_message msg = {
2709                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2710                 .rpc_argp = &args,
2711                 .rpc_resp = &res,
2712                 .rpc_cred = entry->cred,
2713         };
2714         int mode = entry->mask;
2715         int status;
2716
2717         /*
2718          * Determine which access bits we want to ask for...
2719          */
2720         if (mode & MAY_READ)
2721                 args.access |= NFS4_ACCESS_READ;
2722         if (S_ISDIR(inode->i_mode)) {
2723                 if (mode & MAY_WRITE)
2724                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2725                 if (mode & MAY_EXEC)
2726                         args.access |= NFS4_ACCESS_LOOKUP;
2727         } else {
2728                 if (mode & MAY_WRITE)
2729                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2730                 if (mode & MAY_EXEC)
2731                         args.access |= NFS4_ACCESS_EXECUTE;
2732         }
2733
2734         res.fattr = nfs_alloc_fattr();
2735         if (res.fattr == NULL)
2736                 return -ENOMEM;
2737
2738         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2739         if (!status) {
2740                 nfs_access_set_mask(entry, res.access);
2741                 nfs_refresh_inode(inode, res.fattr);
2742         }
2743         nfs_free_fattr(res.fattr);
2744         return status;
2745 }
2746
2747 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2748 {
2749         struct nfs4_exception exception = { };
2750         int err;
2751         do {
2752                 err = nfs4_handle_exception(NFS_SERVER(inode),
2753                                 _nfs4_proc_access(inode, entry),
2754                                 &exception);
2755         } while (exception.retry);
2756         return err;
2757 }
2758
2759 /*
2760  * TODO: For the time being, we don't try to get any attributes
2761  * along with any of the zero-copy operations READ, READDIR,
2762  * READLINK, WRITE.
2763  *
2764  * In the case of the first three, we want to put the GETATTR
2765  * after the read-type operation -- this is because it is hard
2766  * to predict the length of a GETATTR response in v4, and thus
2767  * align the READ data correctly.  This means that the GETATTR
2768  * may end up partially falling into the page cache, and we should
2769  * shift it into the 'tail' of the xdr_buf before processing.
2770  * To do this efficiently, we need to know the total length
2771  * of data received, which doesn't seem to be available outside
2772  * of the RPC layer.
2773  *
2774  * In the case of WRITE, we also want to put the GETATTR after
2775  * the operation -- in this case because we want to make sure
2776  * we get the post-operation mtime and size.
2777  *
2778  * Both of these changes to the XDR layer would in fact be quite
2779  * minor, but I decided to leave them for a subsequent patch.
2780  */
2781 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2782                 unsigned int pgbase, unsigned int pglen)
2783 {
2784         struct nfs4_readlink args = {
2785                 .fh       = NFS_FH(inode),
2786                 .pgbase   = pgbase,
2787                 .pglen    = pglen,
2788                 .pages    = &page,
2789         };
2790         struct nfs4_readlink_res res;
2791         struct rpc_message msg = {
2792                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2793                 .rpc_argp = &args,
2794                 .rpc_resp = &res,
2795         };
2796
2797         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2798 }
2799
2800 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2801                 unsigned int pgbase, unsigned int pglen)
2802 {
2803         struct nfs4_exception exception = { };
2804         int err;
2805         do {
2806                 err = nfs4_handle_exception(NFS_SERVER(inode),
2807                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2808                                 &exception);
2809         } while (exception.retry);
2810         return err;
2811 }
2812
2813 /*
2814  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2815  */
2816 static int
2817 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2818                  int flags)
2819 {
2820         struct nfs_open_context *ctx;
2821         struct nfs4_state *state;
2822         int status = 0;
2823
2824         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2825         if (IS_ERR(ctx))
2826                 return PTR_ERR(ctx);
2827
2828         sattr->ia_mode &= ~current_umask();
2829         state = nfs4_do_open(dir, dentry, ctx->mode,
2830                         flags, sattr, ctx->cred,
2831                         &ctx->mdsthreshold);
2832         d_drop(dentry);
2833         if (IS_ERR(state)) {
2834                 status = PTR_ERR(state);
2835                 goto out;
2836         }
2837         d_add(dentry, igrab(state->inode));
2838         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2839         ctx->state = state;
2840 out:
2841         put_nfs_open_context(ctx);
2842         return status;
2843 }
2844
2845 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2846 {
2847         struct nfs_server *server = NFS_SERVER(dir);
2848         struct nfs_removeargs args = {
2849                 .fh = NFS_FH(dir),
2850                 .name = *name,
2851         };
2852         struct nfs_removeres res = {
2853                 .server = server,
2854         };
2855         struct rpc_message msg = {
2856                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2857                 .rpc_argp = &args,
2858                 .rpc_resp = &res,
2859         };
2860         int status;
2861
2862         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2863         if (status == 0)
2864                 update_changeattr(dir, &res.cinfo);
2865         return status;
2866 }
2867
2868 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2869 {
2870         struct nfs4_exception exception = { };
2871         int err;
2872         do {
2873                 err = nfs4_handle_exception(NFS_SERVER(dir),
2874                                 _nfs4_proc_remove(dir, name),
2875                                 &exception);
2876         } while (exception.retry);
2877         return err;
2878 }
2879
2880 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2881 {
2882         struct nfs_server *server = NFS_SERVER(dir);
2883         struct nfs_removeargs *args = msg->rpc_argp;
2884         struct nfs_removeres *res = msg->rpc_resp;
2885
2886         res->server = server;
2887         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2888         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2889 }
2890
2891 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2892 {
2893         nfs4_setup_sequence(NFS_SERVER(data->dir),
2894                         &data->args.seq_args,
2895                         &data->res.seq_res,
2896                         task);
2897 }
2898
2899 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2900 {
2901         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2902
2903         if (!nfs4_sequence_done(task, &res->seq_res))
2904                 return 0;
2905         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2906                 return 0;
2907         update_changeattr(dir, &res->cinfo);
2908         return 1;
2909 }
2910
2911 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2912 {
2913         struct nfs_server *server = NFS_SERVER(dir);
2914         struct nfs_renameargs *arg = msg->rpc_argp;
2915         struct nfs_renameres *res = msg->rpc_resp;
2916
2917         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2918         res->server = server;
2919         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2920 }
2921
2922 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2923 {
2924         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2925                         &data->args.seq_args,
2926                         &data->res.seq_res,
2927                         task);
2928 }
2929
2930 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2931                                  struct inode *new_dir)
2932 {
2933         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2934
2935         if (!nfs4_sequence_done(task, &res->seq_res))
2936                 return 0;
2937         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2938                 return 0;
2939
2940         update_changeattr(old_dir, &res->old_cinfo);
2941         update_changeattr(new_dir, &res->new_cinfo);
2942         return 1;
2943 }
2944
2945 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2946                 struct inode *new_dir, struct qstr *new_name)
2947 {
2948         struct nfs_server *server = NFS_SERVER(old_dir);
2949         struct nfs_renameargs arg = {
2950                 .old_dir = NFS_FH(old_dir),
2951                 .new_dir = NFS_FH(new_dir),
2952                 .old_name = old_name,
2953                 .new_name = new_name,
2954         };
2955         struct nfs_renameres res = {
2956                 .server = server,
2957         };
2958         struct rpc_message msg = {
2959                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2960                 .rpc_argp = &arg,
2961                 .rpc_resp = &res,
2962         };
2963         int status = -ENOMEM;
2964
2965         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2966         if (!status) {
2967                 update_changeattr(old_dir, &res.old_cinfo);
2968                 update_changeattr(new_dir, &res.new_cinfo);
2969         }
2970         return status;
2971 }
2972
2973 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2974                 struct inode *new_dir, struct qstr *new_name)
2975 {
2976         struct nfs4_exception exception = { };
2977         int err;
2978         do {
2979                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2980                                 _nfs4_proc_rename(old_dir, old_name,
2981                                         new_dir, new_name),
2982                                 &exception);
2983         } while (exception.retry);
2984         return err;
2985 }
2986
2987 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2988 {
2989         struct nfs_server *server = NFS_SERVER(inode);
2990         struct nfs4_link_arg arg = {
2991                 .fh     = NFS_FH(inode),
2992                 .dir_fh = NFS_FH(dir),
2993                 .name   = name,
2994                 .bitmask = server->attr_bitmask,
2995         };
2996         struct nfs4_link_res res = {
2997                 .server = server,
2998         };
2999         struct rpc_message msg = {
3000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3001                 .rpc_argp = &arg,
3002                 .rpc_resp = &res,
3003         };
3004         int status = -ENOMEM;
3005
3006         res.fattr = nfs_alloc_fattr();
3007         if (res.fattr == NULL)
3008                 goto out;
3009
3010         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3011         if (!status) {
3012                 update_changeattr(dir, &res.cinfo);
3013                 nfs_post_op_update_inode(inode, res.fattr);
3014         }
3015 out:
3016         nfs_free_fattr(res.fattr);
3017         return status;
3018 }
3019
3020 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3021 {
3022         struct nfs4_exception exception = { };
3023         int err;
3024         do {
3025                 err = nfs4_handle_exception(NFS_SERVER(inode),
3026                                 _nfs4_proc_link(inode, dir, name),
3027                                 &exception);
3028         } while (exception.retry);
3029         return err;
3030 }
3031
3032 struct nfs4_createdata {
3033         struct rpc_message msg;
3034         struct nfs4_create_arg arg;
3035         struct nfs4_create_res res;
3036         struct nfs_fh fh;
3037         struct nfs_fattr fattr;
3038 };
3039
3040 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3041                 struct qstr *name, struct iattr *sattr, u32 ftype)
3042 {
3043         struct nfs4_createdata *data;
3044
3045         data = kzalloc(sizeof(*data), GFP_KERNEL);
3046         if (data != NULL) {
3047                 struct nfs_server *server = NFS_SERVER(dir);
3048
3049                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3050                 data->msg.rpc_argp = &data->arg;
3051                 data->msg.rpc_resp = &data->res;
3052                 data->arg.dir_fh = NFS_FH(dir);
3053                 data->arg.server = server;
3054                 data->arg.name = name;
3055                 data->arg.attrs = sattr;
3056                 data->arg.ftype = ftype;
3057                 data->arg.bitmask = server->attr_bitmask;
3058                 data->res.server = server;
3059                 data->res.fh = &data->fh;
3060                 data->res.fattr = &data->fattr;
3061                 nfs_fattr_init(data->res.fattr);
3062         }
3063         return data;
3064 }
3065
3066 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3067 {
3068         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3069                                     &data->arg.seq_args, &data->res.seq_res, 1);
3070         if (status == 0) {
3071                 update_changeattr(dir, &data->res.dir_cinfo);
3072                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3073         }
3074         return status;
3075 }
3076
3077 static void nfs4_free_createdata(struct nfs4_createdata *data)
3078 {
3079         kfree(data);
3080 }
3081
3082 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3083                 struct page *page, unsigned int len, struct iattr *sattr)
3084 {
3085         struct nfs4_createdata *data;
3086         int status = -ENAMETOOLONG;
3087
3088         if (len > NFS4_MAXPATHLEN)
3089                 goto out;
3090
3091         status = -ENOMEM;
3092         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3093         if (data == NULL)
3094                 goto out;
3095
3096         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3097         data->arg.u.symlink.pages = &page;
3098         data->arg.u.symlink.len = len;
3099
3100         status = nfs4_do_create(dir, dentry, data);
3101
3102         nfs4_free_createdata(data);
3103 out:
3104         return status;
3105 }
3106
3107 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3108                 struct page *page, unsigned int len, struct iattr *sattr)
3109 {
3110         struct nfs4_exception exception = { };
3111         int err;
3112         do {
3113                 err = nfs4_handle_exception(NFS_SERVER(dir),
3114                                 _nfs4_proc_symlink(dir, dentry, page,
3115                                                         len, sattr),
3116                                 &exception);
3117         } while (exception.retry);
3118         return err;
3119 }
3120
3121 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3122                 struct iattr *sattr)
3123 {
3124         struct nfs4_createdata *data;
3125         int status = -ENOMEM;
3126
3127         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3128         if (data == NULL)
3129                 goto out;
3130
3131         status = nfs4_do_create(dir, dentry, data);
3132
3133         nfs4_free_createdata(data);
3134 out:
3135         return status;
3136 }
3137
3138 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3139                 struct iattr *sattr)
3140 {
3141         struct nfs4_exception exception = { };
3142         int err;
3143
3144         sattr->ia_mode &= ~current_umask();
3145         do {
3146                 err = nfs4_handle_exception(NFS_SERVER(dir),
3147                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3148                                 &exception);
3149         } while (exception.retry);
3150         return err;
3151 }
3152
3153 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3154                 u64 cookie, struct page **pages, unsigned int count, int plus)
3155 {
3156         struct inode            *dir = dentry->d_inode;
3157         struct nfs4_readdir_arg args = {
3158                 .fh = NFS_FH(dir),
3159                 .pages = pages,
3160                 .pgbase = 0,
3161                 .count = count,
3162                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3163                 .plus = plus,
3164         };
3165         struct nfs4_readdir_res res;
3166         struct rpc_message msg = {
3167                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3168                 .rpc_argp = &args,
3169                 .rpc_resp = &res,
3170                 .rpc_cred = cred,
3171         };
3172         int                     status;
3173
3174         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3175                         dentry->d_parent->d_name.name,
3176                         dentry->d_name.name,
3177                         (unsigned long long)cookie);
3178         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3179         res.pgbase = args.pgbase;
3180         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3181         if (status >= 0) {
3182                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3183                 status += args.pgbase;
3184         }
3185
3186         nfs_invalidate_atime(dir);
3187
3188         dprintk("%s: returns %d\n", __func__, status);
3189         return status;
3190 }
3191
3192 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3193                 u64 cookie, struct page **pages, unsigned int count, int plus)
3194 {
3195         struct nfs4_exception exception = { };
3196         int err;
3197         do {
3198                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3199                                 _nfs4_proc_readdir(dentry, cred, cookie,
3200                                         pages, count, plus),
3201                                 &exception);
3202         } while (exception.retry);
3203         return err;
3204 }
3205
3206 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3207                 struct iattr *sattr, dev_t rdev)
3208 {
3209         struct nfs4_createdata *data;
3210         int mode = sattr->ia_mode;
3211         int status = -ENOMEM;
3212
3213         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3214         if (data == NULL)
3215                 goto out;
3216
3217         if (S_ISFIFO(mode))
3218                 data->arg.ftype = NF4FIFO;
3219         else if (S_ISBLK(mode)) {
3220                 data->arg.ftype = NF4BLK;
3221                 data->arg.u.device.specdata1 = MAJOR(rdev);
3222                 data->arg.u.device.specdata2 = MINOR(rdev);
3223         }
3224         else if (S_ISCHR(mode)) {
3225                 data->arg.ftype = NF4CHR;
3226                 data->arg.u.device.specdata1 = MAJOR(rdev);
3227                 data->arg.u.device.specdata2 = MINOR(rdev);
3228         } else if (!S_ISSOCK(mode)) {
3229                 status = -EINVAL;
3230                 goto out_free;
3231         }
3232
3233         status = nfs4_do_create(dir, dentry, data);
3234 out_free:
3235         nfs4_free_createdata(data);
3236 out:
3237         return status;
3238 }
3239
3240 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3241                 struct iattr *sattr, dev_t rdev)
3242 {
3243         struct nfs4_exception exception = { };
3244         int err;
3245
3246         sattr->ia_mode &= ~current_umask();
3247         do {
3248                 err = nfs4_handle_exception(NFS_SERVER(dir),
3249                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3250                                 &exception);
3251         } while (exception.retry);
3252         return err;
3253 }
3254
3255 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3256                  struct nfs_fsstat *fsstat)
3257 {
3258         struct nfs4_statfs_arg args = {
3259                 .fh = fhandle,
3260                 .bitmask = server->attr_bitmask,
3261         };
3262         struct nfs4_statfs_res res = {
3263                 .fsstat = fsstat,
3264         };
3265         struct rpc_message msg = {
3266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3267                 .rpc_argp = &args,
3268                 .rpc_resp = &res,
3269         };
3270
3271         nfs_fattr_init(fsstat->fattr);
3272         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3273 }
3274
3275 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3276 {
3277         struct nfs4_exception exception = { };
3278         int err;
3279         do {
3280                 err = nfs4_handle_exception(server,
3281                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3282                                 &exception);
3283         } while (exception.retry);
3284         return err;
3285 }
3286
3287 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3288                 struct nfs_fsinfo *fsinfo)
3289 {
3290         struct nfs4_fsinfo_arg args = {
3291                 .fh = fhandle,
3292                 .bitmask = server->attr_bitmask,
3293         };
3294         struct nfs4_fsinfo_res res = {
3295                 .fsinfo = fsinfo,
3296         };
3297         struct rpc_message msg = {
3298                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3299                 .rpc_argp = &args,
3300                 .rpc_resp = &res,
3301         };
3302
3303         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3304 }
3305
3306 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3307 {
3308         struct nfs4_exception exception = { };
3309         int err;
3310
3311         do {
3312                 err = nfs4_handle_exception(server,
3313                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3314                                 &exception);
3315         } while (exception.retry);
3316         return err;
3317 }
3318
3319 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3320 {
3321         int error;
3322
3323         nfs_fattr_init(fsinfo->fattr);
3324         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3325         if (error == 0) {
3326                 /* block layout checks this! */
3327                 server->pnfs_blksize = fsinfo->blksize;
3328                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3329         }
3330
3331         return error;
3332 }
3333
3334 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3335                 struct nfs_pathconf *pathconf)
3336 {
3337         struct nfs4_pathconf_arg args = {
3338                 .fh = fhandle,
3339                 .bitmask = server->attr_bitmask,
3340         };
3341         struct nfs4_pathconf_res res = {
3342                 .pathconf = pathconf,
3343         };
3344         struct rpc_message msg = {
3345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3346                 .rpc_argp = &args,
3347                 .rpc_resp = &res,
3348         };
3349
3350         /* None of the pathconf attributes are mandatory to implement */
3351         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3352                 memset(pathconf, 0, sizeof(*pathconf));
3353                 return 0;
3354         }
3355
3356         nfs_fattr_init(pathconf->fattr);
3357         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3358 }
3359
3360 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3361                 struct nfs_pathconf *pathconf)
3362 {
3363         struct nfs4_exception exception = { };
3364         int err;
3365
3366         do {
3367                 err = nfs4_handle_exception(server,
3368                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3369                                 &exception);
3370         } while (exception.retry);
3371         return err;
3372 }
3373
3374 void __nfs4_read_done_cb(struct nfs_read_data *data)
3375 {
3376         nfs_invalidate_atime(data->header->inode);
3377 }
3378
3379 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3380 {
3381         struct nfs_server *server = NFS_SERVER(data->header->inode);
3382
3383         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3384                 rpc_restart_call_prepare(task);
3385                 return -EAGAIN;
3386         }
3387
3388         __nfs4_read_done_cb(data);
3389         if (task->tk_status > 0)
3390                 renew_lease(server, data->timestamp);
3391         return 0;
3392 }
3393
3394 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3395 {
3396
3397         dprintk("--> %s\n", __func__);
3398
3399         if (!nfs4_sequence_done(task, &data->res.seq_res))
3400                 return -EAGAIN;
3401
3402         return data->read_done_cb ? data->read_done_cb(task, data) :
3403                                     nfs4_read_done_cb(task, data);
3404 }
3405
3406 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3407 {
3408         data->timestamp   = jiffies;
3409         data->read_done_cb = nfs4_read_done_cb;
3410         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3411         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3412 }
3413
3414 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3415 {
3416         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3417                         &data->args.seq_args,
3418                         &data->res.seq_res,
3419                         task);
3420 }
3421
3422 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3423 {
3424         struct inode *inode = data->header->inode;
3425
3426         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3427                 rpc_restart_call_prepare(task);
3428                 return -EAGAIN;
3429         }
3430         if (task->tk_status >= 0) {
3431                 renew_lease(NFS_SERVER(inode), data->timestamp);
3432                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3433         }
3434         return 0;
3435 }
3436
3437 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3438 {
3439         if (!nfs4_sequence_done(task, &data->res.seq_res))
3440                 return -EAGAIN;
3441         return data->write_done_cb ? data->write_done_cb(task, data) :
3442                 nfs4_write_done_cb(task, data);
3443 }
3444
3445 static
3446 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3447 {
3448         const struct nfs_pgio_header *hdr = data->header;
3449
3450         /* Don't request attributes for pNFS or O_DIRECT writes */
3451         if (data->ds_clp != NULL || hdr->dreq != NULL)
3452                 return false;
3453         /* Otherwise, request attributes if and only if we don't hold
3454          * a delegation
3455          */
3456         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3457 }
3458
3459 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3460 {
3461         struct nfs_server *server = NFS_SERVER(data->header->inode);
3462
3463         if (!nfs4_write_need_cache_consistency_data(data)) {
3464                 data->args.bitmask = NULL;
3465                 data->res.fattr = NULL;
3466         } else
3467                 data->args.bitmask = server->cache_consistency_bitmask;
3468
3469         if (!data->write_done_cb)
3470                 data->write_done_cb = nfs4_write_done_cb;
3471         data->res.server = server;
3472         data->timestamp   = jiffies;
3473
3474         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3475         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3476 }
3477
3478 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3479 {
3480         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3481                         &data->args.seq_args,
3482                         &data->res.seq_res,
3483                         task);
3484 }
3485
3486 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3487 {
3488         nfs4_setup_sequence(NFS_SERVER(data->inode),
3489                         &data->args.seq_args,
3490                         &data->res.seq_res,
3491                         task);
3492 }
3493
3494 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3495 {
3496         struct inode *inode = data->inode;
3497
3498         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3499                 rpc_restart_call_prepare(task);
3500                 return -EAGAIN;
3501         }
3502         return 0;
3503 }
3504
3505 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3506 {
3507         if (!nfs4_sequence_done(task, &data->res.seq_res))
3508                 return -EAGAIN;
3509         return data->commit_done_cb(task, data);
3510 }
3511
3512 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3513 {
3514         struct nfs_server *server = NFS_SERVER(data->inode);
3515
3516         if (data->commit_done_cb == NULL)
3517                 data->commit_done_cb = nfs4_commit_done_cb;
3518         data->res.server = server;
3519         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3520         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3521 }
3522
3523 struct nfs4_renewdata {
3524         struct nfs_client       *client;
3525         unsigned long           timestamp;
3526 };
3527
3528 /*
3529  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3530  * standalone procedure for queueing an asynchronous RENEW.
3531  */
3532 static void nfs4_renew_release(void *calldata)
3533 {
3534         struct nfs4_renewdata *data = calldata;
3535         struct nfs_client *clp = data->client;
3536
3537         if (atomic_read(&clp->cl_count) > 1)
3538                 nfs4_schedule_state_renewal(clp);
3539         nfs_put_client(clp);
3540         kfree(data);
3541 }
3542
3543 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3544 {
3545         struct nfs4_renewdata *data = calldata;
3546         struct nfs_client *clp = data->client;
3547         unsigned long timestamp = data->timestamp;
3548
3549         if (task->tk_status < 0) {
3550                 /* Unless we're shutting down, schedule state recovery! */
3551                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3552                         return;
3553                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3554                         nfs4_schedule_lease_recovery(clp);
3555                         return;
3556                 }
3557                 nfs4_schedule_path_down_recovery(clp);
3558         }
3559         do_renew_lease(clp, timestamp);
3560 }
3561
3562 static const struct rpc_call_ops nfs4_renew_ops = {
3563         .rpc_call_done = nfs4_renew_done,
3564         .rpc_release = nfs4_renew_release,
3565 };
3566
3567 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3568 {
3569         struct rpc_message msg = {
3570                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3571                 .rpc_argp       = clp,
3572                 .rpc_cred       = cred,
3573         };
3574         struct nfs4_renewdata *data;
3575
3576         if (renew_flags == 0)
3577                 return 0;
3578         if (!atomic_inc_not_zero(&clp->cl_count))
3579                 return -EIO;
3580         data = kmalloc(sizeof(*data), GFP_NOFS);
3581         if (data == NULL)
3582                 return -ENOMEM;
3583         data->client = clp;
3584         data->timestamp = jiffies;
3585         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3586                         &nfs4_renew_ops, data);
3587 }
3588
3589 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3590 {
3591         struct rpc_message msg = {
3592                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3593                 .rpc_argp       = clp,
3594                 .rpc_cred       = cred,
3595         };
3596         unsigned long now = jiffies;
3597         int status;
3598
3599         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3600         if (status < 0)
3601                 return status;
3602         do_renew_lease(clp, now);
3603         return 0;
3604 }
3605
3606 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3607 {
3608         return (server->caps & NFS_CAP_ACLS)
3609                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3610                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3611 }
3612
3613 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3614  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3615  * the stack.
3616  */
3617 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3618
3619 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3620                 struct page **pages, unsigned int *pgbase)
3621 {
3622         struct page *newpage, **spages;
3623         int rc = 0;
3624         size_t len;
3625         spages = pages;
3626
3627         do {
3628                 len = min_t(size_t, PAGE_SIZE, buflen);
3629                 newpage = alloc_page(GFP_KERNEL);
3630
3631                 if (newpage == NULL)
3632                         goto unwind;
3633                 memcpy(page_address(newpage), buf, len);
3634                 buf += len;
3635                 buflen -= len;
3636                 *pages++ = newpage;
3637                 rc++;
3638         } while (buflen != 0);
3639
3640         return rc;
3641
3642 unwind:
3643         for(; rc > 0; rc--)
3644                 __free_page(spages[rc-1]);
3645         return -ENOMEM;
3646 }
3647
3648 struct nfs4_cached_acl {
3649         int cached;
3650         size_t len;
3651         char data[0];
3652 };
3653
3654 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3655 {
3656         struct nfs_inode *nfsi = NFS_I(inode);
3657
3658         spin_lock(&inode->i_lock);
3659         kfree(nfsi->nfs4_acl);
3660         nfsi->nfs4_acl = acl;
3661         spin_unlock(&inode->i_lock);
3662 }
3663
3664 static void nfs4_zap_acl_attr(struct inode *inode)
3665 {
3666         nfs4_set_cached_acl(inode, NULL);
3667 }
3668
3669 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3670 {
3671         struct nfs_inode *nfsi = NFS_I(inode);
3672         struct nfs4_cached_acl *acl;
3673         int ret = -ENOENT;
3674
3675         spin_lock(&inode->i_lock);
3676         acl = nfsi->nfs4_acl;
3677         if (acl == NULL)
3678                 goto out;
3679         if (buf == NULL) /* user is just asking for length */
3680                 goto out_len;
3681         if (acl->cached == 0)
3682                 goto out;
3683         ret = -ERANGE; /* see getxattr(2) man page */
3684         if (acl->len > buflen)
3685                 goto out;
3686         memcpy(buf, acl->data, acl->len);
3687 out_len:
3688         ret = acl->len;
3689 out:
3690         spin_unlock(&inode->i_lock);
3691         return ret;
3692 }
3693
3694 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3695 {
3696         struct nfs4_cached_acl *acl;
3697         size_t buflen = sizeof(*acl) + acl_len;
3698
3699         if (buflen <= PAGE_SIZE) {
3700                 acl = kmalloc(buflen, GFP_KERNEL);
3701                 if (acl == NULL)
3702                         goto out;
3703                 acl->cached = 1;
3704                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3705         } else {
3706                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3707                 if (acl == NULL)
3708                         goto out;
3709                 acl->cached = 0;
3710         }
3711         acl->len = acl_len;
3712 out:
3713         nfs4_set_cached_acl(inode, acl);
3714 }
3715
3716 /*
3717  * The getxattr API returns the required buffer length when called with a
3718  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3719  * the required buf.  On a NULL buf, we send a page of data to the server
3720  * guessing that the ACL request can be serviced by a page. If so, we cache
3721  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3722  * the cache. If not so, we throw away the page, and cache the required
3723  * length. The next getxattr call will then produce another round trip to
3724  * the server, this time with the input buf of the required size.
3725  */
3726 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3727 {
3728         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3729         struct nfs_getaclargs args = {
3730                 .fh = NFS_FH(inode),
3731                 .acl_pages = pages,
3732                 .acl_len = buflen,
3733         };
3734         struct nfs_getaclres res = {
3735                 .acl_len = buflen,
3736         };
3737         struct rpc_message msg = {
3738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3739                 .rpc_argp = &args,
3740                 .rpc_resp = &res,
3741         };
3742         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3743         int ret = -ENOMEM, i;
3744
3745         /* As long as we're doing a round trip to the server anyway,
3746          * let's be prepared for a page of acl data. */
3747         if (npages == 0)
3748                 npages = 1;
3749         if (npages > ARRAY_SIZE(pages))
3750                 return -ERANGE;
3751
3752         for (i = 0; i < npages; i++) {
3753                 pages[i] = alloc_page(GFP_KERNEL);
3754                 if (!pages[i])
3755                         goto out_free;
3756         }
3757
3758         /* for decoding across pages */
3759         res.acl_scratch = alloc_page(GFP_KERNEL);
3760         if (!res.acl_scratch)
3761                 goto out_free;
3762
3763         args.acl_len = npages * PAGE_SIZE;
3764         args.acl_pgbase = 0;
3765
3766         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3767                 __func__, buf, buflen, npages, args.acl_len);
3768         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3769                              &msg, &args.seq_args, &res.seq_res, 0);
3770         if (ret)
3771                 goto out_free;
3772
3773         /* Handle the case where the passed-in buffer is too short */
3774         if (res.acl_flags & NFS4_ACL_TRUNC) {
3775                 /* Did the user only issue a request for the acl length? */
3776                 if (buf == NULL)
3777                         goto out_ok;
3778                 ret = -ERANGE;
3779                 goto out_free;
3780         }
3781         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3782         if (buf)
3783                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3784 out_ok:
3785         ret = res.acl_len;
3786 out_free:
3787         for (i = 0; i < npages; i++)
3788                 if (pages[i])
3789                         __free_page(pages[i]);
3790         if (res.acl_scratch)
3791                 __free_page(res.acl_scratch);
3792         return ret;
3793 }
3794
3795 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3796 {
3797         struct nfs4_exception exception = { };
3798         ssize_t ret;
3799         do {
3800                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3801                 if (ret >= 0)
3802                         break;
3803                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3804         } while (exception.retry);
3805         return ret;
3806 }
3807
3808 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3809 {
3810         struct nfs_server *server = NFS_SERVER(inode);
3811         int ret;
3812
3813         if (!nfs4_server_supports_acls(server))
3814                 return -EOPNOTSUPP;
3815         ret = nfs_revalidate_inode(server, inode);
3816         if (ret < 0)
3817                 return ret;
3818         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3819                 nfs_zap_acl_cache(inode);
3820         ret = nfs4_read_cached_acl(inode, buf, buflen);
3821         if (ret != -ENOENT)
3822                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3823                  * but no cached acl data, just the acl length */
3824                 return ret;
3825         return nfs4_get_acl_uncached(inode, buf, buflen);
3826 }
3827
3828 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3829 {
3830         struct nfs_server *server = NFS_SERVER(inode);
3831         struct page *pages[NFS4ACL_MAXPAGES];
3832         struct nfs_setaclargs arg = {
3833                 .fh             = NFS_FH(inode),
3834                 .acl_pages      = pages,
3835                 .acl_len        = buflen,
3836         };
3837         struct nfs_setaclres res;
3838         struct rpc_message msg = {
3839                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3840                 .rpc_argp       = &arg,
3841                 .rpc_resp       = &res,
3842         };
3843         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3844         int ret, i;
3845
3846         if (!nfs4_server_supports_acls(server))
3847                 return -EOPNOTSUPP;
3848         if (npages > ARRAY_SIZE(pages))
3849                 return -ERANGE;
3850         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3851         if (i < 0)
3852                 return i;
3853         nfs4_inode_return_delegation(inode);
3854         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3855
3856         /*
3857          * Free each page after tx, so the only ref left is
3858          * held by the network stack
3859          */
3860         for (; i > 0; i--)
3861                 put_page(pages[i-1]);
3862
3863         /*
3864          * Acl update can result in inode attribute update.
3865          * so mark the attribute cache invalid.
3866          */
3867         spin_lock(&inode->i_lock);
3868         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3869         spin_unlock(&inode->i_lock);
3870         nfs_access_zap_cache(inode);
3871         nfs_zap_acl_cache(inode);
3872         return ret;
3873 }
3874
3875 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3876 {
3877         struct nfs4_exception exception = { };
3878         int err;
3879         do {
3880                 err = nfs4_handle_exception(NFS_SERVER(inode),
3881                                 __nfs4_proc_set_acl(inode, buf, buflen),
3882                                 &exception);
3883         } while (exception.retry);
3884         return err;
3885 }
3886
3887 static int
3888 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3889 {
3890         struct nfs_client *clp = server->nfs_client;
3891
3892         if (task->tk_status >= 0)
3893                 return 0;
3894         switch(task->tk_status) {
3895                 case -NFS4ERR_DELEG_REVOKED:
3896                 case -NFS4ERR_ADMIN_REVOKED:
3897                 case -NFS4ERR_BAD_STATEID:
3898                         if (state == NULL)
3899                                 break;
3900                         nfs_remove_bad_delegation(state->inode);
3901                 case -NFS4ERR_OPENMODE:
3902                         if (state == NULL)
3903                                 break;
3904                         nfs4_schedule_stateid_recovery(server, state);
3905                         goto wait_on_recovery;
3906                 case -NFS4ERR_EXPIRED:
3907                         if (state != NULL)
3908                                 nfs4_schedule_stateid_recovery(server, state);
3909                 case -NFS4ERR_STALE_STATEID:
3910                 case -NFS4ERR_STALE_CLIENTID:
3911                         nfs4_schedule_lease_recovery(clp);
3912                         goto wait_on_recovery;
3913 #if defined(CONFIG_NFS_V4_1)
3914                 case -NFS4ERR_BADSESSION:
3915                 case -NFS4ERR_BADSLOT:
3916                 case -NFS4ERR_BAD_HIGH_SLOT:
3917                 case -NFS4ERR_DEADSESSION:
3918                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3919                 case -NFS4ERR_SEQ_FALSE_RETRY:
3920                 case -NFS4ERR_SEQ_MISORDERED:
3921                         dprintk("%s ERROR %d, Reset session\n", __func__,
3922                                 task->tk_status);
3923                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3924                         task->tk_status = 0;
3925                         return -EAGAIN;
3926 #endif /* CONFIG_NFS_V4_1 */
3927                 case -NFS4ERR_DELAY:
3928                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3929                 case -NFS4ERR_GRACE:
3930                 case -EKEYEXPIRED:
3931                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3932                         task->tk_status = 0;
3933                         return -EAGAIN;
3934                 case -NFS4ERR_RETRY_UNCACHED_REP:
3935                 case -NFS4ERR_OLD_STATEID:
3936                         task->tk_status = 0;
3937                         return -EAGAIN;
3938         }
3939         task->tk_status = nfs4_map_errors(task->tk_status);
3940         return 0;
3941 wait_on_recovery:
3942         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3943         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3944                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3945         task->tk_status = 0;
3946         return -EAGAIN;
3947 }
3948
3949 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3950                                     nfs4_verifier *bootverf)
3951 {
3952         __be32 verf[2];
3953
3954         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3955                 /* An impossible timestamp guarantees this value
3956                  * will never match a generated boot time. */
3957                 verf[0] = 0;
3958                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3959         } else {
3960                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3961                 verf[0] = (__be32)nn->boot_time.tv_sec;
3962                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3963         }
3964         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3965 }
3966
3967 static unsigned int
3968 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
3969                                    char *buf, size_t len)
3970 {
3971         unsigned int result;
3972
3973         rcu_read_lock();
3974         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
3975                                 clp->cl_ipaddr,
3976                                 rpc_peeraddr2str(clp->cl_rpcclient,
3977                                                         RPC_DISPLAY_ADDR),
3978                                 rpc_peeraddr2str(clp->cl_rpcclient,
3979                                                         RPC_DISPLAY_PROTO));
3980         rcu_read_unlock();
3981         return result;
3982 }
3983
3984 static unsigned int
3985 nfs4_init_uniform_client_string(const struct nfs_client *clp,
3986                                 char *buf, size_t len)
3987 {
3988         char *nodename = clp->cl_rpcclient->cl_nodename;
3989
3990         if (nfs4_client_id_uniquifier[0] != '\0')
3991                 nodename = nfs4_client_id_uniquifier;
3992         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
3993                                 clp->rpc_ops->version, clp->cl_minorversion,
3994                                 nodename);
3995 }
3996
3997 /**
3998  * nfs4_proc_setclientid - Negotiate client ID
3999  * @clp: state data structure
4000  * @program: RPC program for NFSv4 callback service
4001  * @port: IP port number for NFS4 callback service
4002  * @cred: RPC credential to use for this call
4003  * @res: where to place the result
4004  *
4005  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4006  */
4007 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4008                 unsigned short port, struct rpc_cred *cred,
4009                 struct nfs4_setclientid_res *res)
4010 {
4011         nfs4_verifier sc_verifier;
4012         struct nfs4_setclientid setclientid = {
4013                 .sc_verifier = &sc_verifier,
4014                 .sc_prog = program,
4015                 .sc_cb_ident = clp->cl_cb_ident,
4016         };
4017         struct rpc_message msg = {
4018                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4019                 .rpc_argp = &setclientid,
4020                 .rpc_resp = res,
4021                 .rpc_cred = cred,
4022         };
4023         int status;
4024
4025         /* nfs_client_id4 */
4026         nfs4_init_boot_verifier(clp, &sc_verifier);
4027         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4028                 setclientid.sc_name_len =
4029                                 nfs4_init_uniform_client_string(clp,
4030                                                 setclientid.sc_name,
4031                                                 sizeof(setclientid.sc_name));
4032         else
4033                 setclientid.sc_name_len =
4034                                 nfs4_init_nonuniform_client_string(clp,
4035                                                 setclientid.sc_name,
4036                                                 sizeof(setclientid.sc_name));
4037         /* cb_client4 */
4038         rcu_read_lock();
4039         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4040                                 sizeof(setclientid.sc_netid),
4041                                 rpc_peeraddr2str(clp->cl_rpcclient,
4042                                                         RPC_DISPLAY_NETID));
4043         rcu_read_unlock();
4044         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4045                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4046                                 clp->cl_ipaddr, port >> 8, port & 255);
4047
4048         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4049                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4050                 setclientid.sc_name_len, setclientid.sc_name);
4051         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4052         dprintk("NFS reply setclientid: %d\n", status);
4053         return status;
4054 }
4055
4056 /**
4057  * nfs4_proc_setclientid_confirm - Confirm client ID
4058  * @clp: state data structure
4059  * @res: result of a previous SETCLIENTID
4060  * @cred: RPC credential to use for this call
4061  *
4062  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4063  */
4064 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4065                 struct nfs4_setclientid_res *arg,
4066                 struct rpc_cred *cred)
4067 {
4068         struct nfs_fsinfo fsinfo;
4069         struct rpc_message msg = {
4070                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4071                 .rpc_argp = arg,
4072                 .rpc_resp = &fsinfo,
4073                 .rpc_cred = cred,
4074         };
4075         unsigned long now;
4076         int status;
4077
4078         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4079                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4080                 clp->cl_clientid);
4081         now = jiffies;
4082         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4083         if (status == 0) {
4084                 spin_lock(&clp->cl_lock);
4085                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4086                 clp->cl_last_renewal = now;
4087                 spin_unlock(&clp->cl_lock);
4088         }
4089         dprintk("NFS reply setclientid_confirm: %d\n", status);
4090         return status;
4091 }
4092
4093 struct nfs4_delegreturndata {
4094         struct nfs4_delegreturnargs args;
4095         struct nfs4_delegreturnres res;
4096         struct nfs_fh fh;
4097         nfs4_stateid stateid;
4098         unsigned long timestamp;
4099         struct nfs_fattr fattr;
4100         int rpc_status;
4101 };
4102
4103 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4104 {
4105         struct nfs4_delegreturndata *data = calldata;
4106
4107         if (!nfs4_sequence_done(task, &data->res.seq_res))
4108                 return;
4109
4110         switch (task->tk_status) {
4111         case -NFS4ERR_STALE_STATEID:
4112         case -NFS4ERR_EXPIRED:
4113         case 0:
4114                 renew_lease(data->res.server, data->timestamp);
4115                 break;
4116         default:
4117                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4118                                 -EAGAIN) {
4119                         rpc_restart_call_prepare(task);
4120                         return;
4121                 }
4122         }
4123         data->rpc_status = task->tk_status;
4124 }
4125
4126 static void nfs4_delegreturn_release(void *calldata)
4127 {
4128         kfree(calldata);
4129 }
4130
4131 #if defined(CONFIG_NFS_V4_1)
4132 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4133 {
4134         struct nfs4_delegreturndata *d_data;
4135
4136         d_data = (struct nfs4_delegreturndata *)data;
4137
4138         nfs4_setup_sequence(d_data->res.server,
4139                         &d_data->args.seq_args,
4140                         &d_data->res.seq_res,
4141                         task);
4142 }
4143 #endif /* CONFIG_NFS_V4_1 */
4144
4145 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4146 #if defined(CONFIG_NFS_V4_1)
4147         .rpc_call_prepare = nfs4_delegreturn_prepare,
4148 #endif /* CONFIG_NFS_V4_1 */
4149         .rpc_call_done = nfs4_delegreturn_done,
4150         .rpc_release = nfs4_delegreturn_release,
4151 };
4152
4153 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4154 {
4155         struct nfs4_delegreturndata *data;
4156         struct nfs_server *server = NFS_SERVER(inode);
4157         struct rpc_task *task;
4158         struct rpc_message msg = {
4159                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4160                 .rpc_cred = cred,
4161         };
4162         struct rpc_task_setup task_setup_data = {
4163                 .rpc_client = server->client,
4164                 .rpc_message = &msg,
4165                 .callback_ops = &nfs4_delegreturn_ops,
4166                 .flags = RPC_TASK_ASYNC,
4167         };
4168         int status = 0;
4169
4170         data = kzalloc(sizeof(*data), GFP_NOFS);
4171         if (data == NULL)
4172                 return -ENOMEM;
4173         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4174         data->args.fhandle = &data->fh;
4175         data->args.stateid = &data->stateid;
4176         data->args.bitmask = server->cache_consistency_bitmask;
4177         nfs_copy_fh(&data->fh, NFS_FH(inode));
4178         nfs4_stateid_copy(&data->stateid, stateid);
4179         data->res.fattr = &data->fattr;
4180         data->res.server = server;
4181         nfs_fattr_init(data->res.fattr);
4182         data->timestamp = jiffies;
4183         data->rpc_status = 0;
4184
4185         task_setup_data.callback_data = data;
4186         msg.rpc_argp = &data->args;
4187         msg.rpc_resp = &data->res;
4188         task = rpc_run_task(&task_setup_data);
4189         if (IS_ERR(task))
4190                 return PTR_ERR(task);
4191         if (!issync)
4192                 goto out;
4193         status = nfs4_wait_for_completion_rpc_task(task);
4194         if (status != 0)
4195                 goto out;
4196         status = data->rpc_status;
4197         if (status == 0)
4198                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4199         else
4200                 nfs_refresh_inode(inode, &data->fattr);
4201 out:
4202         rpc_put_task(task);
4203         return status;
4204 }
4205
4206 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4207 {
4208         struct nfs_server *server = NFS_SERVER(inode);
4209         struct nfs4_exception exception = { };
4210         int err;
4211         do {
4212                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4213                 switch (err) {
4214                         case -NFS4ERR_STALE_STATEID:
4215                         case -NFS4ERR_EXPIRED:
4216                         case 0:
4217                                 return 0;
4218                 }
4219                 err = nfs4_handle_exception(server, err, &exception);
4220         } while (exception.retry);
4221         return err;
4222 }
4223
4224 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4225 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4226
4227 /*
4228  * sleep, with exponential backoff, and retry the LOCK operation.
4229  */
4230 static unsigned long
4231 nfs4_set_lock_task_retry(unsigned long timeout)
4232 {
4233         freezable_schedule_timeout_killable(timeout);
4234         timeout <<= 1;
4235         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4236                 return NFS4_LOCK_MAXTIMEOUT;
4237         return timeout;
4238 }
4239
4240 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4241 {
4242         struct inode *inode = state->inode;
4243         struct nfs_server *server = NFS_SERVER(inode);
4244         struct nfs_client *clp = server->nfs_client;
4245         struct nfs_lockt_args arg = {
4246                 .fh = NFS_FH(inode),
4247                 .fl = request,
4248         };
4249         struct nfs_lockt_res res = {
4250                 .denied = request,
4251         };
4252         struct rpc_message msg = {
4253                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4254                 .rpc_argp       = &arg,
4255                 .rpc_resp       = &res,
4256                 .rpc_cred       = state->owner->so_cred,
4257         };
4258         struct nfs4_lock_state *lsp;
4259         int status;
4260
4261         arg.lock_owner.clientid = clp->cl_clientid;
4262         status = nfs4_set_lock_state(state, request);
4263         if (status != 0)
4264                 goto out;
4265         lsp = request->fl_u.nfs4_fl.owner;
4266         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4267         arg.lock_owner.s_dev = server->s_dev;
4268         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4269         switch (status) {
4270                 case 0:
4271                         request->fl_type = F_UNLCK;
4272                         break;
4273                 case -NFS4ERR_DENIED:
4274                         status = 0;
4275         }
4276         request->fl_ops->fl_release_private(request);
4277 out:
4278         return status;
4279 }
4280
4281 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4282 {
4283         struct nfs4_exception exception = { };
4284         int err;
4285
4286         do {
4287                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4288                                 _nfs4_proc_getlk(state, cmd, request),
4289                                 &exception);
4290         } while (exception.retry);
4291         return err;
4292 }
4293
4294 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4295 {
4296         int res = 0;
4297         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4298                 case FL_POSIX:
4299                         res = posix_lock_file_wait(file, fl);
4300                         break;
4301                 case FL_FLOCK:
4302                         res = flock_lock_file_wait(file, fl);
4303                         break;
4304                 default:
4305                         BUG();
4306         }
4307         return res;
4308 }
4309
4310 struct nfs4_unlockdata {
4311         struct nfs_locku_args arg;
4312         struct nfs_locku_res res;
4313         struct nfs4_lock_state *lsp;
4314         struct nfs_open_context *ctx;
4315         struct file_lock fl;
4316         const struct nfs_server *server;
4317         unsigned long timestamp;
4318 };
4319
4320 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4321                 struct nfs_open_context *ctx,
4322                 struct nfs4_lock_state *lsp,
4323                 struct nfs_seqid *seqid)
4324 {
4325         struct nfs4_unlockdata *p;
4326         struct inode *inode = lsp->ls_state->inode;
4327
4328         p = kzalloc(sizeof(*p), GFP_NOFS);
4329         if (p == NULL)
4330                 return NULL;
4331         p->arg.fh = NFS_FH(inode);
4332         p->arg.fl = &p->fl;
4333         p->arg.seqid = seqid;
4334         p->res.seqid = seqid;
4335         p->arg.stateid = &lsp->ls_stateid;
4336         p->lsp = lsp;
4337         atomic_inc(&lsp->ls_count);
4338         /* Ensure we don't close file until we're done freeing locks! */
4339         p->ctx = get_nfs_open_context(ctx);
4340         memcpy(&p->fl, fl, sizeof(p->fl));
4341         p->server = NFS_SERVER(inode);
4342         return p;
4343 }
4344
4345 static void nfs4_locku_release_calldata(void *data)
4346 {
4347         struct nfs4_unlockdata *calldata = data;
4348         nfs_free_seqid(calldata->arg.seqid);
4349         nfs4_put_lock_state(calldata->lsp);
4350         put_nfs_open_context(calldata->ctx);
4351         kfree(calldata);
4352 }
4353
4354 static void nfs4_locku_done(struct rpc_task *task, void *data)
4355 {
4356         struct nfs4_unlockdata *calldata = data;
4357
4358         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4359                 return;
4360         switch (task->tk_status) {
4361                 case 0:
4362                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4363                                         &calldata->res.stateid);
4364                         renew_lease(calldata->server, calldata->timestamp);
4365                         break;
4366                 case -NFS4ERR_BAD_STATEID:
4367                 case -NFS4ERR_OLD_STATEID:
4368                 case -NFS4ERR_STALE_STATEID:
4369                 case -NFS4ERR_EXPIRED:
4370                         break;
4371                 default:
4372                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4373                                 rpc_restart_call_prepare(task);
4374         }
4375         nfs_release_seqid(calldata->arg.seqid);
4376 }
4377
4378 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4379 {
4380         struct nfs4_unlockdata *calldata = data;
4381
4382         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4383                 return;
4384         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4385                 /* Note: exit _without_ running nfs4_locku_done */
4386                 task->tk_action = NULL;
4387                 return;
4388         }
4389         calldata->timestamp = jiffies;
4390         if (nfs4_setup_sequence(calldata->server,
4391                                 &calldata->arg.seq_args,
4392                                 &calldata->res.seq_res,
4393                                 task) != 0)
4394                 nfs_release_seqid(calldata->arg.seqid);
4395 }
4396
4397 static const struct rpc_call_ops nfs4_locku_ops = {
4398         .rpc_call_prepare = nfs4_locku_prepare,
4399         .rpc_call_done = nfs4_locku_done,
4400         .rpc_release = nfs4_locku_release_calldata,
4401 };
4402
4403 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4404                 struct nfs_open_context *ctx,
4405                 struct nfs4_lock_state *lsp,
4406                 struct nfs_seqid *seqid)
4407 {
4408         struct nfs4_unlockdata *data;
4409         struct rpc_message msg = {
4410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4411                 .rpc_cred = ctx->cred,
4412         };
4413         struct rpc_task_setup task_setup_data = {
4414                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4415                 .rpc_message = &msg,
4416                 .callback_ops = &nfs4_locku_ops,
4417                 .workqueue = nfsiod_workqueue,
4418                 .flags = RPC_TASK_ASYNC,
4419         };
4420
4421         /* Ensure this is an unlock - when canceling a lock, the
4422          * canceled lock is passed in, and it won't be an unlock.
4423          */
4424         fl->fl_type = F_UNLCK;
4425
4426         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4427         if (data == NULL) {
4428                 nfs_free_seqid(seqid);
4429                 return ERR_PTR(-ENOMEM);
4430         }
4431
4432         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4433         msg.rpc_argp = &data->arg;
4434         msg.rpc_resp = &data->res;
4435         task_setup_data.callback_data = data;
4436         return rpc_run_task(&task_setup_data);
4437 }
4438
4439 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4440 {
4441         struct nfs_inode *nfsi = NFS_I(state->inode);
4442         struct nfs_seqid *seqid;
4443         struct nfs4_lock_state *lsp;
4444         struct rpc_task *task;
4445         int status = 0;
4446         unsigned char fl_flags = request->fl_flags;
4447
4448         status = nfs4_set_lock_state(state, request);
4449         /* Unlock _before_ we do the RPC call */
4450         request->fl_flags |= FL_EXISTS;
4451         down_read(&nfsi->rwsem);
4452         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4453                 up_read(&nfsi->rwsem);
4454                 goto out;
4455         }
4456         up_read(&nfsi->rwsem);
4457         if (status != 0)
4458                 goto out;
4459         /* Is this a delegated lock? */
4460         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4461                 goto out;
4462         lsp = request->fl_u.nfs4_fl.owner;
4463         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4464         status = -ENOMEM;
4465         if (seqid == NULL)
4466                 goto out;
4467         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4468         status = PTR_ERR(task);
4469         if (IS_ERR(task))
4470                 goto out;
4471         status = nfs4_wait_for_completion_rpc_task(task);
4472         rpc_put_task(task);
4473 out:
4474         request->fl_flags = fl_flags;
4475         return status;
4476 }
4477
4478 struct nfs4_lockdata {
4479         struct nfs_lock_args arg;
4480         struct nfs_lock_res res;
4481         struct nfs4_lock_state *lsp;
4482         struct nfs_open_context *ctx;
4483         struct file_lock fl;
4484         unsigned long timestamp;
4485         int rpc_status;
4486         int cancelled;
4487         struct nfs_server *server;
4488 };
4489
4490 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4491                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4492                 gfp_t gfp_mask)
4493 {
4494         struct nfs4_lockdata *p;
4495         struct inode *inode = lsp->ls_state->inode;
4496         struct nfs_server *server = NFS_SERVER(inode);
4497
4498         p = kzalloc(sizeof(*p), gfp_mask);
4499         if (p == NULL)
4500                 return NULL;
4501
4502         p->arg.fh = NFS_FH(inode);
4503         p->arg.fl = &p->fl;
4504         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4505         if (p->arg.open_seqid == NULL)
4506                 goto out_free;
4507         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4508         if (p->arg.lock_seqid == NULL)
4509                 goto out_free_seqid;
4510         p->arg.lock_stateid = &lsp->ls_stateid;
4511         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4512         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4513         p->arg.lock_owner.s_dev = server->s_dev;
4514         p->res.lock_seqid = p->arg.lock_seqid;
4515         p->lsp = lsp;
4516         p->server = server;
4517         atomic_inc(&lsp->ls_count);
4518         p->ctx = get_nfs_open_context(ctx);
4519         memcpy(&p->fl, fl, sizeof(p->fl));
4520         return p;
4521 out_free_seqid:
4522         nfs_free_seqid(p->arg.open_seqid);
4523 out_free:
4524         kfree(p);
4525         return NULL;
4526 }
4527
4528 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4529 {
4530         struct nfs4_lockdata *data = calldata;
4531         struct nfs4_state *state = data->lsp->ls_state;
4532
4533         dprintk("%s: begin!\n", __func__);
4534         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4535                 return;
4536         /* Do we need to do an open_to_lock_owner? */
4537         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4538                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4539                         goto out_release_lock_seqid;
4540                 }
4541                 data->arg.open_stateid = &state->stateid;
4542                 data->arg.new_lock_owner = 1;
4543                 data->res.open_seqid = data->arg.open_seqid;
4544         } else
4545                 data->arg.new_lock_owner = 0;
4546         data->timestamp = jiffies;
4547         if (nfs4_setup_sequence(data->server,
4548                                 &data->arg.seq_args,
4549                                 &data->res.seq_res,
4550                                 task) == 0)
4551                 return;
4552         nfs_release_seqid(data->arg.open_seqid);
4553 out_release_lock_seqid:
4554         nfs_release_seqid(data->arg.lock_seqid);
4555         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4556 }
4557
4558 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4559 {
4560         struct nfs4_lockdata *data = calldata;
4561
4562         dprintk("%s: begin!\n", __func__);
4563
4564         if (!nfs4_sequence_done(task, &data->res.seq_res))
4565                 return;
4566
4567         data->rpc_status = task->tk_status;
4568         if (data->arg.new_lock_owner != 0) {
4569                 if (data->rpc_status == 0)
4570                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4571                 else
4572                         goto out;
4573         }
4574         if (data->rpc_status == 0) {
4575                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4576                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4577                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4578         }
4579 out:
4580         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4581 }
4582
4583 static void nfs4_lock_release(void *calldata)
4584 {
4585         struct nfs4_lockdata *data = calldata;
4586
4587         dprintk("%s: begin!\n", __func__);
4588         nfs_free_seqid(data->arg.open_seqid);
4589         if (data->cancelled != 0) {
4590                 struct rpc_task *task;
4591                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4592                                 data->arg.lock_seqid);
4593                 if (!IS_ERR(task))
4594                         rpc_put_task_async(task);
4595                 dprintk("%s: cancelling lock!\n", __func__);
4596         } else
4597                 nfs_free_seqid(data->arg.lock_seqid);
4598         nfs4_put_lock_state(data->lsp);
4599         put_nfs_open_context(data->ctx);
4600         kfree(data);
4601         dprintk("%s: done!\n", __func__);
4602 }
4603
4604 static const struct rpc_call_ops nfs4_lock_ops = {
4605         .rpc_call_prepare = nfs4_lock_prepare,
4606         .rpc_call_done = nfs4_lock_done,
4607         .rpc_release = nfs4_lock_release,
4608 };
4609
4610 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4611 {
4612         switch (error) {
4613         case -NFS4ERR_ADMIN_REVOKED:
4614         case -NFS4ERR_BAD_STATEID:
4615                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4616                 if (new_lock_owner != 0 ||
4617                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4618                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4619                 break;
4620         case -NFS4ERR_STALE_STATEID:
4621                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4622         case -NFS4ERR_EXPIRED:
4623                 nfs4_schedule_lease_recovery(server->nfs_client);
4624         };
4625 }
4626
4627 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4628 {
4629         struct nfs4_lockdata *data;
4630         struct rpc_task *task;
4631         struct rpc_message msg = {
4632                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4633                 .rpc_cred = state->owner->so_cred,
4634         };
4635         struct rpc_task_setup task_setup_data = {
4636                 .rpc_client = NFS_CLIENT(state->inode),
4637                 .rpc_message = &msg,
4638                 .callback_ops = &nfs4_lock_ops,
4639                 .workqueue = nfsiod_workqueue,
4640                 .flags = RPC_TASK_ASYNC,
4641         };
4642         int ret;
4643
4644         dprintk("%s: begin!\n", __func__);
4645         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4646                         fl->fl_u.nfs4_fl.owner,
4647                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4648         if (data == NULL)
4649                 return -ENOMEM;
4650         if (IS_SETLKW(cmd))
4651                 data->arg.block = 1;
4652         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4653         msg.rpc_argp = &data->arg;
4654         msg.rpc_resp = &data->res;
4655         task_setup_data.callback_data = data;
4656         if (recovery_type > NFS_LOCK_NEW) {
4657                 if (recovery_type == NFS_LOCK_RECLAIM)
4658                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4659                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4660         }
4661         task = rpc_run_task(&task_setup_data);
4662         if (IS_ERR(task))
4663                 return PTR_ERR(task);
4664         ret = nfs4_wait_for_completion_rpc_task(task);
4665         if (ret == 0) {
4666                 ret = data->rpc_status;
4667                 if (ret)
4668                         nfs4_handle_setlk_error(data->server, data->lsp,
4669                                         data->arg.new_lock_owner, ret);
4670         } else
4671                 data->cancelled = 1;
4672         rpc_put_task(task);
4673         dprintk("%s: done, ret = %d!\n", __func__, ret);
4674         return ret;
4675 }
4676
4677 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4678 {
4679         struct nfs_server *server = NFS_SERVER(state->inode);
4680         struct nfs4_exception exception = {
4681                 .inode = state->inode,
4682         };
4683         int err;
4684
4685         do {
4686                 /* Cache the lock if possible... */
4687                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4688                         return 0;
4689                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4690                 if (err != -NFS4ERR_DELAY)
4691                         break;
4692                 nfs4_handle_exception(server, err, &exception);
4693         } while (exception.retry);
4694         return err;
4695 }
4696
4697 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4698 {
4699         struct nfs_server *server = NFS_SERVER(state->inode);
4700         struct nfs4_exception exception = {
4701                 .inode = state->inode,
4702         };
4703         int err;
4704
4705         err = nfs4_set_lock_state(state, request);
4706         if (err != 0)
4707                 return err;
4708         do {
4709                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4710                         return 0;
4711                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4712                 switch (err) {
4713                 default:
4714                         goto out;
4715                 case -NFS4ERR_GRACE:
4716                 case -NFS4ERR_DELAY:
4717                         nfs4_handle_exception(server, err, &exception);
4718                         err = 0;
4719                 }
4720         } while (exception.retry);
4721 out:
4722         return err;
4723 }
4724
4725 #if defined(CONFIG_NFS_V4_1)
4726 /**
4727  * nfs41_check_expired_locks - possibly free a lock stateid
4728  *
4729  * @state: NFSv4 state for an inode
4730  *
4731  * Returns NFS_OK if recovery for this stateid is now finished.
4732  * Otherwise a negative NFS4ERR value is returned.
4733  */
4734 static int nfs41_check_expired_locks(struct nfs4_state *state)
4735 {
4736         int status, ret = -NFS4ERR_BAD_STATEID;
4737         struct nfs4_lock_state *lsp;
4738         struct nfs_server *server = NFS_SERVER(state->inode);
4739
4740         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4741                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4742                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4743                         if (status != NFS_OK) {
4744                                 /* Free the stateid unless the server
4745                                  * informs us the stateid is unrecognized. */
4746                                 if (status != -NFS4ERR_BAD_STATEID)
4747                                         nfs41_free_stateid(server,
4748                                                         &lsp->ls_stateid);
4749                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4750                                 ret = status;
4751                         }
4752                 }
4753         };
4754
4755         return ret;
4756 }
4757
4758 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4759 {
4760         int status = NFS_OK;
4761
4762         if (test_bit(LK_STATE_IN_USE, &state->flags))
4763                 status = nfs41_check_expired_locks(state);
4764         if (status != NFS_OK)
4765                 status = nfs4_lock_expired(state, request);
4766         return status;
4767 }
4768 #endif
4769
4770 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4771 {
4772         struct nfs_inode *nfsi = NFS_I(state->inode);
4773         unsigned char fl_flags = request->fl_flags;
4774         int status = -ENOLCK;
4775
4776         if ((fl_flags & FL_POSIX) &&
4777                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4778                 goto out;
4779         /* Is this a delegated open? */
4780         status = nfs4_set_lock_state(state, request);
4781         if (status != 0)
4782                 goto out;
4783         request->fl_flags |= FL_ACCESS;
4784         status = do_vfs_lock(request->fl_file, request);
4785         if (status < 0)
4786                 goto out;
4787         down_read(&nfsi->rwsem);
4788         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4789                 /* Yes: cache locks! */
4790                 /* ...but avoid races with delegation recall... */
4791                 request->fl_flags = fl_flags & ~FL_SLEEP;
4792                 status = do_vfs_lock(request->fl_file, request);
4793                 goto out_unlock;
4794         }
4795         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4796         if (status != 0)
4797                 goto out_unlock;
4798         /* Note: we always want to sleep here! */
4799         request->fl_flags = fl_flags | FL_SLEEP;
4800         if (do_vfs_lock(request->fl_file, request) < 0)
4801                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4802                         "manager!\n", __func__);
4803 out_unlock:
4804         up_read(&nfsi->rwsem);
4805 out:
4806         request->fl_flags = fl_flags;
4807         return status;
4808 }
4809
4810 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4811 {
4812         struct nfs4_exception exception = {
4813                 .state = state,
4814                 .inode = state->inode,
4815         };
4816         int err;
4817
4818         do {
4819                 err = _nfs4_proc_setlk(state, cmd, request);
4820                 if (err == -NFS4ERR_DENIED)
4821                         err = -EAGAIN;
4822                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4823                                 err, &exception);
4824         } while (exception.retry);
4825         return err;
4826 }
4827
4828 static int
4829 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4830 {
4831         struct nfs_open_context *ctx;
4832         struct nfs4_state *state;
4833         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4834         int status;
4835
4836         /* verify open state */
4837         ctx = nfs_file_open_context(filp);
4838         state = ctx->state;
4839
4840         if (request->fl_start < 0 || request->fl_end < 0)
4841                 return -EINVAL;
4842
4843         if (IS_GETLK(cmd)) {
4844                 if (state != NULL)
4845                         return nfs4_proc_getlk(state, F_GETLK, request);
4846                 return 0;
4847         }
4848
4849         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4850                 return -EINVAL;
4851
4852         if (request->fl_type == F_UNLCK) {
4853                 if (state != NULL)
4854                         return nfs4_proc_unlck(state, cmd, request);
4855                 return 0;
4856         }
4857
4858         if (state == NULL)
4859                 return -ENOLCK;
4860         /*
4861          * Don't rely on the VFS having checked the file open mode,
4862          * since it won't do this for flock() locks.
4863          */
4864         switch (request->fl_type) {
4865         case F_RDLCK:
4866                 if (!(filp->f_mode & FMODE_READ))
4867                         return -EBADF;
4868                 break;
4869         case F_WRLCK:
4870                 if (!(filp->f_mode & FMODE_WRITE))
4871                         return -EBADF;
4872         }
4873
4874         do {
4875                 status = nfs4_proc_setlk(state, cmd, request);
4876                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4877                         break;
4878                 timeout = nfs4_set_lock_task_retry(timeout);
4879                 status = -ERESTARTSYS;
4880                 if (signalled())
4881                         break;
4882         } while(status < 0);
4883         return status;
4884 }
4885
4886 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4887 {
4888         struct nfs_server *server = NFS_SERVER(state->inode);
4889         struct nfs4_exception exception = { };
4890         int err;
4891
4892         err = nfs4_set_lock_state(state, fl);
4893         if (err != 0)
4894                 goto out;
4895         do {
4896                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4897                 switch (err) {
4898                         default:
4899                                 printk(KERN_ERR "NFS: %s: unhandled error "
4900                                         "%d.\n", __func__, err);
4901                         case 0:
4902                         case -ESTALE:
4903                                 goto out;
4904                         case -NFS4ERR_EXPIRED:
4905                                 nfs4_schedule_stateid_recovery(server, state);
4906                         case -NFS4ERR_STALE_CLIENTID:
4907                         case -NFS4ERR_STALE_STATEID:
4908                                 nfs4_schedule_lease_recovery(server->nfs_client);
4909                                 goto out;
4910                         case -NFS4ERR_BADSESSION:
4911                         case -NFS4ERR_BADSLOT:
4912                         case -NFS4ERR_BAD_HIGH_SLOT:
4913                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4914                         case -NFS4ERR_DEADSESSION:
4915                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4916                                 goto out;
4917                         case -ERESTARTSYS:
4918                                 /*
4919                                  * The show must go on: exit, but mark the
4920                                  * stateid as needing recovery.
4921                                  */
4922                         case -NFS4ERR_DELEG_REVOKED:
4923                         case -NFS4ERR_ADMIN_REVOKED:
4924                         case -NFS4ERR_BAD_STATEID:
4925                         case -NFS4ERR_OPENMODE:
4926                                 nfs4_schedule_stateid_recovery(server, state);
4927                                 err = 0;
4928                                 goto out;
4929                         case -EKEYEXPIRED:
4930                                 /*
4931                                  * User RPCSEC_GSS context has expired.
4932                                  * We cannot recover this stateid now, so
4933                                  * skip it and allow recovery thread to
4934                                  * proceed.
4935                                  */
4936                                 err = 0;
4937                                 goto out;
4938                         case -ENOMEM:
4939                         case -NFS4ERR_DENIED:
4940                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4941                                 err = 0;
4942                                 goto out;
4943                         case -NFS4ERR_DELAY:
4944                                 break;
4945                 }
4946                 err = nfs4_handle_exception(server, err, &exception);
4947         } while (exception.retry);
4948 out:
4949         return err;
4950 }
4951
4952 struct nfs_release_lockowner_data {
4953         struct nfs4_lock_state *lsp;
4954         struct nfs_server *server;
4955         struct nfs_release_lockowner_args args;
4956 };
4957
4958 static void nfs4_release_lockowner_release(void *calldata)
4959 {
4960         struct nfs_release_lockowner_data *data = calldata;
4961         nfs4_free_lock_state(data->server, data->lsp);
4962         kfree(calldata);
4963 }
4964
4965 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4966         .rpc_release = nfs4_release_lockowner_release,
4967 };
4968
4969 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4970 {
4971         struct nfs_server *server = lsp->ls_state->owner->so_server;
4972         struct nfs_release_lockowner_data *data;
4973         struct rpc_message msg = {
4974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4975         };
4976
4977         if (server->nfs_client->cl_mvops->minor_version != 0)
4978                 return -EINVAL;
4979         data = kmalloc(sizeof(*data), GFP_NOFS);
4980         if (!data)
4981                 return -ENOMEM;
4982         data->lsp = lsp;
4983         data->server = server;
4984         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4985         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4986         data->args.lock_owner.s_dev = server->s_dev;
4987         msg.rpc_argp = &data->args;
4988         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4989         return 0;
4990 }
4991
4992 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4993
4994 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4995                                    const void *buf, size_t buflen,
4996                                    int flags, int type)
4997 {
4998         if (strcmp(key, "") != 0)
4999                 return -EINVAL;
5000
5001         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5002 }
5003
5004 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5005                                    void *buf, size_t buflen, int type)
5006 {
5007         if (strcmp(key, "") != 0)
5008                 return -EINVAL;
5009
5010         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5011 }
5012
5013 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5014                                        size_t list_len, const char *name,
5015                                        size_t name_len, int type)
5016 {
5017         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5018
5019         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5020                 return 0;
5021
5022         if (list && len <= list_len)
5023                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5024         return len;
5025 }
5026
5027 /*
5028  * nfs_fhget will use either the mounted_on_fileid or the fileid
5029  */
5030 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5031 {
5032         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5033                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5034               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5035               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5036                 return;
5037
5038         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5039                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5040         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5041         fattr->nlink = 2;
5042 }
5043
5044 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5045                                    const struct qstr *name,
5046                                    struct nfs4_fs_locations *fs_locations,
5047                                    struct page *page)
5048 {
5049         struct nfs_server *server = NFS_SERVER(dir);
5050         u32 bitmask[2] = {
5051                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5052         };
5053         struct nfs4_fs_locations_arg args = {
5054                 .dir_fh = NFS_FH(dir),
5055                 .name = name,
5056                 .page = page,
5057                 .bitmask = bitmask,
5058         };
5059         struct nfs4_fs_locations_res res = {
5060                 .fs_locations = fs_locations,
5061         };
5062         struct rpc_message msg = {
5063                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5064                 .rpc_argp = &args,
5065                 .rpc_resp = &res,
5066         };
5067         int status;
5068
5069         dprintk("%s: start\n", __func__);
5070
5071         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5072          * is not supported */
5073         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5074                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5075         else
5076                 bitmask[0] |= FATTR4_WORD0_FILEID;
5077
5078         nfs_fattr_init(&fs_locations->fattr);
5079         fs_locations->server = server;
5080         fs_locations->nlocations = 0;
5081         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5082         dprintk("%s: returned status = %d\n", __func__, status);
5083         return status;
5084 }
5085
5086 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5087                            const struct qstr *name,
5088                            struct nfs4_fs_locations *fs_locations,
5089                            struct page *page)
5090 {
5091         struct nfs4_exception exception = { };
5092         int err;
5093         do {
5094                 err = nfs4_handle_exception(NFS_SERVER(dir),
5095                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5096                                 &exception);
5097         } while (exception.retry);
5098         return err;
5099 }
5100
5101 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5102 {
5103         int status;
5104         struct nfs4_secinfo_arg args = {
5105                 .dir_fh = NFS_FH(dir),
5106                 .name   = name,
5107         };
5108         struct nfs4_secinfo_res res = {
5109                 .flavors     = flavors,
5110         };
5111         struct rpc_message msg = {
5112                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5113                 .rpc_argp = &args,
5114                 .rpc_resp = &res,
5115         };
5116
5117         dprintk("NFS call  secinfo %s\n", name->name);
5118         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5119         dprintk("NFS reply  secinfo: %d\n", status);
5120         return status;
5121 }
5122
5123 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5124                       struct nfs4_secinfo_flavors *flavors)
5125 {
5126         struct nfs4_exception exception = { };
5127         int err;
5128         do {
5129                 err = nfs4_handle_exception(NFS_SERVER(dir),
5130                                 _nfs4_proc_secinfo(dir, name, flavors),
5131                                 &exception);
5132         } while (exception.retry);
5133         return err;
5134 }
5135
5136 #ifdef CONFIG_NFS_V4_1
5137 /*
5138  * Check the exchange flags returned by the server for invalid flags, having
5139  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5140  * DS flags set.
5141  */
5142 static int nfs4_check_cl_exchange_flags(u32 flags)
5143 {
5144         if (flags & ~EXCHGID4_FLAG_MASK_R)
5145                 goto out_inval;
5146         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5147             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5148                 goto out_inval;
5149         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5150                 goto out_inval;
5151         return NFS_OK;
5152 out_inval:
5153         return -NFS4ERR_INVAL;
5154 }
5155
5156 static bool
5157 nfs41_same_server_scope(struct nfs41_server_scope *a,
5158                         struct nfs41_server_scope *b)
5159 {
5160         if (a->server_scope_sz == b->server_scope_sz &&
5161             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5162                 return true;
5163
5164         return false;
5165 }
5166
5167 /*
5168  * nfs4_proc_bind_conn_to_session()
5169  *
5170  * The 4.1 client currently uses the same TCP connection for the
5171  * fore and backchannel.
5172  */
5173 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5174 {
5175         int status;
5176         struct nfs41_bind_conn_to_session_res res;
5177         struct rpc_message msg = {
5178                 .rpc_proc =
5179                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5180                 .rpc_argp = clp,
5181                 .rpc_resp = &res,
5182                 .rpc_cred = cred,
5183         };
5184
5185         dprintk("--> %s\n", __func__);
5186
5187         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5188         if (unlikely(res.session == NULL)) {
5189                 status = -ENOMEM;
5190                 goto out;
5191         }
5192
5193         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5194         if (status == 0) {
5195                 if (memcmp(res.session->sess_id.data,
5196                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5197                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5198                         status = -EIO;
5199                         goto out_session;
5200                 }
5201                 if (res.dir != NFS4_CDFS4_BOTH) {
5202                         dprintk("NFS: %s: Unexpected direction from server\n",
5203                                 __func__);
5204                         status = -EIO;
5205                         goto out_session;
5206                 }
5207                 if (res.use_conn_in_rdma_mode) {
5208                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5209                                 __func__);
5210                         status = -EIO;
5211                         goto out_session;
5212                 }
5213         }
5214 out_session:
5215         kfree(res.session);
5216 out:
5217         dprintk("<-- %s status= %d\n", __func__, status);
5218         return status;
5219 }
5220
5221 /*
5222  * nfs4_proc_exchange_id()
5223  *
5224  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5225  *
5226  * Since the clientid has expired, all compounds using sessions
5227  * associated with the stale clientid will be returning
5228  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5229  * be in some phase of session reset.
5230  */
5231 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5232 {
5233         nfs4_verifier verifier;
5234         struct nfs41_exchange_id_args args = {
5235                 .verifier = &verifier,
5236                 .client = clp,
5237                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5238         };
5239         struct nfs41_exchange_id_res res = {
5240                 0
5241         };
5242         int status;
5243         struct rpc_message msg = {
5244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5245                 .rpc_argp = &args,
5246                 .rpc_resp = &res,
5247                 .rpc_cred = cred,
5248         };
5249
5250         nfs4_init_boot_verifier(clp, &verifier);
5251         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5252                                                         sizeof(args.id));
5253         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5254                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5255                 args.id_len, args.id);
5256
5257         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5258                                         GFP_NOFS);
5259         if (unlikely(res.server_owner == NULL)) {
5260                 status = -ENOMEM;
5261                 goto out;
5262         }
5263
5264         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5265                                         GFP_NOFS);
5266         if (unlikely(res.server_scope == NULL)) {
5267                 status = -ENOMEM;
5268                 goto out_server_owner;
5269         }
5270
5271         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5272         if (unlikely(res.impl_id == NULL)) {
5273                 status = -ENOMEM;
5274                 goto out_server_scope;
5275         }
5276
5277         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5278         if (status == 0)
5279                 status = nfs4_check_cl_exchange_flags(res.flags);
5280
5281         if (status == 0) {
5282                 clp->cl_clientid = res.clientid;
5283                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5284                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5285                         clp->cl_seqid = res.seqid;
5286
5287                 kfree(clp->cl_serverowner);
5288                 clp->cl_serverowner = res.server_owner;
5289                 res.server_owner = NULL;
5290
5291                 /* use the most recent implementation id */
5292                 kfree(clp->cl_implid);
5293                 clp->cl_implid = res.impl_id;
5294
5295                 if (clp->cl_serverscope != NULL &&
5296                     !nfs41_same_server_scope(clp->cl_serverscope,
5297                                              res.server_scope)) {
5298                         dprintk("%s: server_scope mismatch detected\n",
5299                                 __func__);
5300                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5301                         kfree(clp->cl_serverscope);
5302                         clp->cl_serverscope = NULL;
5303                 }
5304
5305                 if (clp->cl_serverscope == NULL) {
5306                         clp->cl_serverscope = res.server_scope;
5307                         goto out;
5308                 }
5309         } else
5310                 kfree(res.impl_id);
5311
5312 out_server_owner:
5313         kfree(res.server_owner);
5314 out_server_scope:
5315         kfree(res.server_scope);
5316 out:
5317         if (clp->cl_implid != NULL)
5318                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5319                         "domain: %s, name: %s, date: %llu,%u\n",
5320                         clp->cl_implid->domain, clp->cl_implid->name,
5321                         clp->cl_implid->date.seconds,
5322                         clp->cl_implid->date.nseconds);
5323         dprintk("NFS reply exchange_id: %d\n", status);
5324         return status;
5325 }
5326
5327 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5328                 struct rpc_cred *cred)
5329 {
5330         struct rpc_message msg = {
5331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5332                 .rpc_argp = clp,
5333                 .rpc_cred = cred,
5334         };
5335         int status;
5336
5337         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5338         if (status)
5339                 dprintk("NFS: Got error %d from the server %s on "
5340                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5341         return status;
5342 }
5343
5344 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5345                 struct rpc_cred *cred)
5346 {
5347         unsigned int loop;
5348         int ret;
5349
5350         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5351                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5352                 switch (ret) {
5353                 case -NFS4ERR_DELAY:
5354                 case -NFS4ERR_CLIENTID_BUSY:
5355                         ssleep(1);
5356                         break;
5357                 default:
5358                         return ret;
5359                 }
5360         }
5361         return 0;
5362 }
5363
5364 int nfs4_destroy_clientid(struct nfs_client *clp)
5365 {
5366         struct rpc_cred *cred;
5367         int ret = 0;
5368
5369         if (clp->cl_mvops->minor_version < 1)
5370                 goto out;
5371         if (clp->cl_exchange_flags == 0)
5372                 goto out;
5373         if (clp->cl_preserve_clid)
5374                 goto out;
5375         cred = nfs4_get_exchange_id_cred(clp);
5376         ret = nfs4_proc_destroy_clientid(clp, cred);
5377         if (cred)
5378                 put_rpccred(cred);
5379         switch (ret) {
5380         case 0:
5381         case -NFS4ERR_STALE_CLIENTID:
5382                 clp->cl_exchange_flags = 0;
5383         }
5384 out:
5385         return ret;
5386 }
5387
5388 struct nfs4_get_lease_time_data {
5389         struct nfs4_get_lease_time_args *args;
5390         struct nfs4_get_lease_time_res *res;
5391         struct nfs_client *clp;
5392 };
5393
5394 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5395                                         void *calldata)
5396 {
5397         struct nfs4_get_lease_time_data *data =
5398                         (struct nfs4_get_lease_time_data *)calldata;
5399
5400         dprintk("--> %s\n", __func__);
5401         /* just setup sequence, do not trigger session recovery
5402            since we're invoked within one */
5403         nfs41_setup_sequence(data->clp->cl_session,
5404                         &data->args->la_seq_args,
5405                         &data->res->lr_seq_res,
5406                         task);
5407         dprintk("<-- %s\n", __func__);
5408 }
5409
5410 /*
5411  * Called from nfs4_state_manager thread for session setup, so don't recover
5412  * from sequence operation or clientid errors.
5413  */
5414 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5415 {
5416         struct nfs4_get_lease_time_data *data =
5417                         (struct nfs4_get_lease_time_data *)calldata;
5418
5419         dprintk("--> %s\n", __func__);
5420         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5421                 return;
5422         switch (task->tk_status) {
5423         case -NFS4ERR_DELAY:
5424         case -NFS4ERR_GRACE:
5425                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5426                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5427                 task->tk_status = 0;
5428                 /* fall through */
5429         case -NFS4ERR_RETRY_UNCACHED_REP:
5430                 rpc_restart_call_prepare(task);
5431                 return;
5432         }
5433         dprintk("<-- %s\n", __func__);
5434 }
5435
5436 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5437         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5438         .rpc_call_done = nfs4_get_lease_time_done,
5439 };
5440
5441 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5442 {
5443         struct rpc_task *task;
5444         struct nfs4_get_lease_time_args args;
5445         struct nfs4_get_lease_time_res res = {
5446                 .lr_fsinfo = fsinfo,
5447         };
5448         struct nfs4_get_lease_time_data data = {
5449                 .args = &args,
5450                 .res = &res,
5451                 .clp = clp,
5452         };
5453         struct rpc_message msg = {
5454                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5455                 .rpc_argp = &args,
5456                 .rpc_resp = &res,
5457         };
5458         struct rpc_task_setup task_setup = {
5459                 .rpc_client = clp->cl_rpcclient,
5460                 .rpc_message = &msg,
5461                 .callback_ops = &nfs4_get_lease_time_ops,
5462                 .callback_data = &data,
5463                 .flags = RPC_TASK_TIMEOUT,
5464         };
5465         int status;
5466
5467         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5468         nfs4_set_sequence_privileged(&args.la_seq_args);
5469         dprintk("--> %s\n", __func__);
5470         task = rpc_run_task(&task_setup);
5471
5472         if (IS_ERR(task))
5473                 status = PTR_ERR(task);
5474         else {
5475                 status = task->tk_status;
5476                 rpc_put_task(task);
5477         }
5478         dprintk("<-- %s return %d\n", __func__, status);
5479
5480         return status;
5481 }
5482
5483 /*
5484  * Initialize the values to be used by the client in CREATE_SESSION
5485  * If nfs4_init_session set the fore channel request and response sizes,
5486  * use them.
5487  *
5488  * Set the back channel max_resp_sz_cached to zero to force the client to
5489  * always set csa_cachethis to FALSE because the current implementation
5490  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5491  */
5492 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5493 {
5494         struct nfs4_session *session = args->client->cl_session;
5495         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5496                      mxresp_sz = session->fc_target_max_resp_sz;
5497
5498         if (mxrqst_sz == 0)
5499                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5500         if (mxresp_sz == 0)
5501                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5502         /* Fore channel attributes */
5503         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5504         args->fc_attrs.max_resp_sz = mxresp_sz;
5505         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5506         args->fc_attrs.max_reqs = max_session_slots;
5507
5508         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5509                 "max_ops=%u max_reqs=%u\n",
5510                 __func__,
5511                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5512                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5513
5514         /* Back channel attributes */
5515         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5516         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5517         args->bc_attrs.max_resp_sz_cached = 0;
5518         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5519         args->bc_attrs.max_reqs = 1;
5520
5521         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5522                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5523                 __func__,
5524                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5525                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5526                 args->bc_attrs.max_reqs);
5527 }
5528
5529 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5530 {
5531         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5532         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5533
5534         if (rcvd->max_resp_sz > sent->max_resp_sz)
5535                 return -EINVAL;
5536         /*
5537          * Our requested max_ops is the minimum we need; we're not
5538          * prepared to break up compounds into smaller pieces than that.
5539          * So, no point even trying to continue if the server won't
5540          * cooperate:
5541          */
5542         if (rcvd->max_ops < sent->max_ops)
5543                 return -EINVAL;
5544         if (rcvd->max_reqs == 0)
5545                 return -EINVAL;
5546         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5547                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5548         return 0;
5549 }
5550
5551 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5552 {
5553         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5554         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5555
5556         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5557                 return -EINVAL;
5558         if (rcvd->max_resp_sz < sent->max_resp_sz)
5559                 return -EINVAL;
5560         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5561                 return -EINVAL;
5562         /* These would render the backchannel useless: */
5563         if (rcvd->max_ops != sent->max_ops)
5564                 return -EINVAL;
5565         if (rcvd->max_reqs != sent->max_reqs)
5566                 return -EINVAL;
5567         return 0;
5568 }
5569
5570 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5571                                      struct nfs4_session *session)
5572 {
5573         int ret;
5574
5575         ret = nfs4_verify_fore_channel_attrs(args, session);
5576         if (ret)
5577                 return ret;
5578         return nfs4_verify_back_channel_attrs(args, session);
5579 }
5580
5581 static int _nfs4_proc_create_session(struct nfs_client *clp,
5582                 struct rpc_cred *cred)
5583 {
5584         struct nfs4_session *session = clp->cl_session;
5585         struct nfs41_create_session_args args = {
5586                 .client = clp,
5587                 .cb_program = NFS4_CALLBACK,
5588         };
5589         struct nfs41_create_session_res res = {
5590                 .client = clp,
5591         };
5592         struct rpc_message msg = {
5593                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5594                 .rpc_argp = &args,
5595                 .rpc_resp = &res,
5596                 .rpc_cred = cred,
5597         };
5598         int status;
5599
5600         nfs4_init_channel_attrs(&args);
5601         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5602
5603         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5604
5605         if (!status) {
5606                 /* Verify the session's negotiated channel_attrs values */
5607                 status = nfs4_verify_channel_attrs(&args, session);
5608                 /* Increment the clientid slot sequence id */
5609                 clp->cl_seqid++;
5610         }
5611
5612         return status;
5613 }
5614
5615 /*
5616  * Issues a CREATE_SESSION operation to the server.
5617  * It is the responsibility of the caller to verify the session is
5618  * expired before calling this routine.
5619  */
5620 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5621 {
5622         int status;
5623         unsigned *ptr;
5624         struct nfs4_session *session = clp->cl_session;
5625
5626         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5627
5628         status = _nfs4_proc_create_session(clp, cred);
5629         if (status)
5630                 goto out;
5631
5632         /* Init or reset the session slot tables */
5633         status = nfs4_setup_session_slot_tables(session);
5634         dprintk("slot table setup returned %d\n", status);
5635         if (status)
5636                 goto out;
5637
5638         ptr = (unsigned *)&session->sess_id.data[0];
5639         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5640                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5641 out:
5642         dprintk("<-- %s\n", __func__);
5643         return status;
5644 }
5645
5646 /*
5647  * Issue the over-the-wire RPC DESTROY_SESSION.
5648  * The caller must serialize access to this routine.
5649  */
5650 int nfs4_proc_destroy_session(struct nfs4_session *session,
5651                 struct rpc_cred *cred)
5652 {
5653         struct rpc_message msg = {
5654                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5655                 .rpc_argp = session,
5656                 .rpc_cred = cred,
5657         };
5658         int status = 0;
5659
5660         dprintk("--> nfs4_proc_destroy_session\n");
5661
5662         /* session is still being setup */
5663         if (session->clp->cl_cons_state != NFS_CS_READY)
5664                 return status;
5665
5666         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5667
5668         if (status)
5669                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5670                         "Session has been destroyed regardless...\n", status);
5671
5672         dprintk("<-- nfs4_proc_destroy_session\n");
5673         return status;
5674 }
5675
5676 /*
5677  * Renew the cl_session lease.
5678  */
5679 struct nfs4_sequence_data {
5680         struct nfs_client *clp;
5681         struct nfs4_sequence_args args;
5682         struct nfs4_sequence_res res;
5683 };
5684
5685 static void nfs41_sequence_release(void *data)
5686 {
5687         struct nfs4_sequence_data *calldata = data;
5688         struct nfs_client *clp = calldata->clp;
5689
5690         if (atomic_read(&clp->cl_count) > 1)
5691                 nfs4_schedule_state_renewal(clp);
5692         nfs_put_client(clp);
5693         kfree(calldata);
5694 }
5695
5696 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5697 {
5698         switch(task->tk_status) {
5699         case -NFS4ERR_DELAY:
5700                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5701                 return -EAGAIN;
5702         default:
5703                 nfs4_schedule_lease_recovery(clp);
5704         }
5705         return 0;
5706 }
5707
5708 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5709 {
5710         struct nfs4_sequence_data *calldata = data;
5711         struct nfs_client *clp = calldata->clp;
5712
5713         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5714                 return;
5715
5716         if (task->tk_status < 0) {
5717                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5718                 if (atomic_read(&clp->cl_count) == 1)
5719                         goto out;
5720
5721                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5722                         rpc_restart_call_prepare(task);
5723                         return;
5724                 }
5725         }
5726         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5727 out:
5728         dprintk("<-- %s\n", __func__);
5729 }
5730
5731 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5732 {
5733         struct nfs4_sequence_data *calldata = data;
5734         struct nfs_client *clp = calldata->clp;
5735         struct nfs4_sequence_args *args;
5736         struct nfs4_sequence_res *res;
5737
5738         args = task->tk_msg.rpc_argp;
5739         res = task->tk_msg.rpc_resp;
5740
5741         nfs41_setup_sequence(clp->cl_session, args, res, task);
5742 }
5743
5744 static const struct rpc_call_ops nfs41_sequence_ops = {
5745         .rpc_call_done = nfs41_sequence_call_done,
5746         .rpc_call_prepare = nfs41_sequence_prepare,
5747         .rpc_release = nfs41_sequence_release,
5748 };
5749
5750 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5751                 struct rpc_cred *cred,
5752                 bool is_privileged)
5753 {
5754         struct nfs4_sequence_data *calldata;
5755         struct rpc_message msg = {
5756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5757                 .rpc_cred = cred,
5758         };
5759         struct rpc_task_setup task_setup_data = {
5760                 .rpc_client = clp->cl_rpcclient,
5761                 .rpc_message = &msg,
5762                 .callback_ops = &nfs41_sequence_ops,
5763                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5764         };
5765
5766         if (!atomic_inc_not_zero(&clp->cl_count))
5767                 return ERR_PTR(-EIO);
5768         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5769         if (calldata == NULL) {
5770                 nfs_put_client(clp);
5771                 return ERR_PTR(-ENOMEM);
5772         }
5773         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5774         if (is_privileged)
5775                 nfs4_set_sequence_privileged(&calldata->args);
5776         msg.rpc_argp = &calldata->args;
5777         msg.rpc_resp = &calldata->res;
5778         calldata->clp = clp;
5779         task_setup_data.callback_data = calldata;
5780
5781         return rpc_run_task(&task_setup_data);
5782 }
5783
5784 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5785 {
5786         struct rpc_task *task;
5787         int ret = 0;
5788
5789         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5790                 return 0;
5791         task = _nfs41_proc_sequence(clp, cred, false);
5792         if (IS_ERR(task))
5793                 ret = PTR_ERR(task);
5794         else
5795                 rpc_put_task_async(task);
5796         dprintk("<-- %s status=%d\n", __func__, ret);
5797         return ret;
5798 }
5799
5800 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5801 {
5802         struct rpc_task *task;
5803         int ret;
5804
5805         task = _nfs41_proc_sequence(clp, cred, true);
5806         if (IS_ERR(task)) {
5807                 ret = PTR_ERR(task);
5808                 goto out;
5809         }
5810         ret = rpc_wait_for_completion_task(task);
5811         if (!ret) {
5812                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5813
5814                 if (task->tk_status == 0)
5815                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5816                 ret = task->tk_status;
5817         }
5818         rpc_put_task(task);
5819 out:
5820         dprintk("<-- %s status=%d\n", __func__, ret);
5821         return ret;
5822 }
5823
5824 struct nfs4_reclaim_complete_data {
5825         struct nfs_client *clp;
5826         struct nfs41_reclaim_complete_args arg;
5827         struct nfs41_reclaim_complete_res res;
5828 };
5829
5830 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5831 {
5832         struct nfs4_reclaim_complete_data *calldata = data;
5833
5834         nfs41_setup_sequence(calldata->clp->cl_session,
5835                         &calldata->arg.seq_args,
5836                         &calldata->res.seq_res,
5837                         task);
5838 }
5839
5840 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5841 {
5842         switch(task->tk_status) {
5843         case 0:
5844         case -NFS4ERR_COMPLETE_ALREADY:
5845         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5846                 break;
5847         case -NFS4ERR_DELAY:
5848                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5849                 /* fall through */
5850         case -NFS4ERR_RETRY_UNCACHED_REP:
5851                 return -EAGAIN;
5852         default:
5853                 nfs4_schedule_lease_recovery(clp);
5854         }
5855         return 0;
5856 }
5857
5858 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5859 {
5860         struct nfs4_reclaim_complete_data *calldata = data;
5861         struct nfs_client *clp = calldata->clp;
5862         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5863
5864         dprintk("--> %s\n", __func__);
5865         if (!nfs41_sequence_done(task, res))
5866                 return;
5867
5868         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5869                 rpc_restart_call_prepare(task);
5870                 return;
5871         }
5872         dprintk("<-- %s\n", __func__);
5873 }
5874
5875 static void nfs4_free_reclaim_complete_data(void *data)
5876 {
5877         struct nfs4_reclaim_complete_data *calldata = data;
5878
5879         kfree(calldata);
5880 }
5881
5882 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5883         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5884         .rpc_call_done = nfs4_reclaim_complete_done,
5885         .rpc_release = nfs4_free_reclaim_complete_data,
5886 };
5887
5888 /*
5889  * Issue a global reclaim complete.
5890  */
5891 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5892 {
5893         struct nfs4_reclaim_complete_data *calldata;
5894         struct rpc_task *task;
5895         struct rpc_message msg = {
5896                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5897         };
5898         struct rpc_task_setup task_setup_data = {
5899                 .rpc_client = clp->cl_rpcclient,
5900                 .rpc_message = &msg,
5901                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5902                 .flags = RPC_TASK_ASYNC,
5903         };
5904         int status = -ENOMEM;
5905
5906         dprintk("--> %s\n", __func__);
5907         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5908         if (calldata == NULL)
5909                 goto out;
5910         calldata->clp = clp;
5911         calldata->arg.one_fs = 0;
5912
5913         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5914         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
5915         msg.rpc_argp = &calldata->arg;
5916         msg.rpc_resp = &calldata->res;
5917         task_setup_data.callback_data = calldata;
5918         task = rpc_run_task(&task_setup_data);
5919         if (IS_ERR(task)) {
5920                 status = PTR_ERR(task);
5921                 goto out;
5922         }
5923         status = nfs4_wait_for_completion_rpc_task(task);
5924         if (status == 0)
5925                 status = task->tk_status;
5926         rpc_put_task(task);
5927         return 0;
5928 out:
5929         dprintk("<-- %s status=%d\n", __func__, status);
5930         return status;
5931 }
5932
5933 static void
5934 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5935 {
5936         struct nfs4_layoutget *lgp = calldata;
5937         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5938         struct nfs4_session *session = nfs4_get_session(server);
5939
5940         dprintk("--> %s\n", __func__);
5941         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5942          * right now covering the LAYOUTGET we are about to send.
5943          * However, that is not so catastrophic, and there seems
5944          * to be no way to prevent it completely.
5945          */
5946         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
5947                                 &lgp->res.seq_res, task))
5948                 return;
5949         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5950                                           NFS_I(lgp->args.inode)->layout,
5951                                           lgp->args.ctx->state)) {
5952                 rpc_exit(task, NFS4_OK);
5953         }
5954 }
5955
5956 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5957 {
5958         struct nfs4_layoutget *lgp = calldata;
5959         struct inode *inode = lgp->args.inode;
5960         struct nfs_server *server = NFS_SERVER(inode);
5961         struct pnfs_layout_hdr *lo;
5962         struct nfs4_state *state = NULL;
5963
5964         dprintk("--> %s\n", __func__);
5965
5966         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
5967                 goto out;
5968
5969         switch (task->tk_status) {
5970         case 0:
5971                 goto out;
5972         case -NFS4ERR_LAYOUTTRYLATER:
5973         case -NFS4ERR_RECALLCONFLICT:
5974                 task->tk_status = -NFS4ERR_DELAY;
5975                 break;
5976         case -NFS4ERR_EXPIRED:
5977         case -NFS4ERR_BAD_STATEID:
5978                 spin_lock(&inode->i_lock);
5979                 lo = NFS_I(inode)->layout;
5980                 if (!lo || list_empty(&lo->plh_segs)) {
5981                         spin_unlock(&inode->i_lock);
5982                         /* If the open stateid was bad, then recover it. */
5983                         state = lgp->args.ctx->state;
5984                 } else {
5985                         LIST_HEAD(head);
5986
5987                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
5988                         spin_unlock(&inode->i_lock);
5989                         /* Mark the bad layout state as invalid, then
5990                          * retry using the open stateid. */
5991                         pnfs_free_lseg_list(&head);
5992                 }
5993         }
5994         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
5995                 rpc_restart_call_prepare(task);
5996 out:
5997         dprintk("<-- %s\n", __func__);
5998 }
5999
6000 static size_t max_response_pages(struct nfs_server *server)
6001 {
6002         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6003         return nfs_page_array_len(0, max_resp_sz);
6004 }
6005
6006 static void nfs4_free_pages(struct page **pages, size_t size)
6007 {
6008         int i;
6009
6010         if (!pages)
6011                 return;
6012
6013         for (i = 0; i < size; i++) {
6014                 if (!pages[i])
6015                         break;
6016                 __free_page(pages[i]);
6017         }
6018         kfree(pages);
6019 }
6020
6021 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6022 {
6023         struct page **pages;
6024         int i;
6025
6026         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6027         if (!pages) {
6028                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6029                 return NULL;
6030         }
6031
6032         for (i = 0; i < size; i++) {
6033                 pages[i] = alloc_page(gfp_flags);
6034                 if (!pages[i]) {
6035                         dprintk("%s: failed to allocate page\n", __func__);
6036                         nfs4_free_pages(pages, size);
6037                         return NULL;
6038                 }
6039         }
6040
6041         return pages;
6042 }
6043
6044 static void nfs4_layoutget_release(void *calldata)
6045 {
6046         struct nfs4_layoutget *lgp = calldata;
6047         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6048         size_t max_pages = max_response_pages(server);
6049
6050         dprintk("--> %s\n", __func__);
6051         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6052         put_nfs_open_context(lgp->args.ctx);
6053         kfree(calldata);
6054         dprintk("<-- %s\n", __func__);
6055 }
6056
6057 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6058         .rpc_call_prepare = nfs4_layoutget_prepare,
6059         .rpc_call_done = nfs4_layoutget_done,
6060         .rpc_release = nfs4_layoutget_release,
6061 };
6062
6063 struct pnfs_layout_segment *
6064 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6065 {
6066         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6067         size_t max_pages = max_response_pages(server);
6068         struct rpc_task *task;
6069         struct rpc_message msg = {
6070                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6071                 .rpc_argp = &lgp->args,
6072                 .rpc_resp = &lgp->res,
6073         };
6074         struct rpc_task_setup task_setup_data = {
6075                 .rpc_client = server->client,
6076                 .rpc_message = &msg,
6077                 .callback_ops = &nfs4_layoutget_call_ops,
6078                 .callback_data = lgp,
6079                 .flags = RPC_TASK_ASYNC,
6080         };
6081         struct pnfs_layout_segment *lseg = NULL;
6082         int status = 0;
6083
6084         dprintk("--> %s\n", __func__);
6085
6086         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6087         if (!lgp->args.layout.pages) {
6088                 nfs4_layoutget_release(lgp);
6089                 return ERR_PTR(-ENOMEM);
6090         }
6091         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6092
6093         lgp->res.layoutp = &lgp->args.layout;
6094         lgp->res.seq_res.sr_slot = NULL;
6095         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6096         task = rpc_run_task(&task_setup_data);
6097         if (IS_ERR(task))
6098                 return ERR_CAST(task);
6099         status = nfs4_wait_for_completion_rpc_task(task);
6100         if (status == 0)
6101                 status = task->tk_status;
6102         if (status == 0)
6103                 lseg = pnfs_layout_process(lgp);
6104         rpc_put_task(task);
6105         dprintk("<-- %s status=%d\n", __func__, status);
6106         if (status)
6107                 return ERR_PTR(status);
6108         return lseg;
6109 }
6110
6111 static void
6112 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6113 {
6114         struct nfs4_layoutreturn *lrp = calldata;
6115
6116         dprintk("--> %s\n", __func__);
6117         nfs41_setup_sequence(lrp->clp->cl_session,
6118                         &lrp->args.seq_args,
6119                         &lrp->res.seq_res,
6120                         task);
6121 }
6122
6123 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6124 {
6125         struct nfs4_layoutreturn *lrp = calldata;
6126         struct nfs_server *server;
6127
6128         dprintk("--> %s\n", __func__);
6129
6130         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6131                 return;
6132
6133         server = NFS_SERVER(lrp->args.inode);
6134         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6135                 rpc_restart_call_prepare(task);
6136                 return;
6137         }
6138         dprintk("<-- %s\n", __func__);
6139 }
6140
6141 static void nfs4_layoutreturn_release(void *calldata)
6142 {
6143         struct nfs4_layoutreturn *lrp = calldata;
6144         struct pnfs_layout_hdr *lo = lrp->args.layout;
6145
6146         dprintk("--> %s\n", __func__);
6147         spin_lock(&lo->plh_inode->i_lock);
6148         if (lrp->res.lrs_present)
6149                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6150         lo->plh_block_lgets--;
6151         spin_unlock(&lo->plh_inode->i_lock);
6152         pnfs_put_layout_hdr(lrp->args.layout);
6153         kfree(calldata);
6154         dprintk("<-- %s\n", __func__);
6155 }
6156
6157 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6158         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6159         .rpc_call_done = nfs4_layoutreturn_done,
6160         .rpc_release = nfs4_layoutreturn_release,
6161 };
6162
6163 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6164 {
6165         struct rpc_task *task;
6166         struct rpc_message msg = {
6167                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6168                 .rpc_argp = &lrp->args,
6169                 .rpc_resp = &lrp->res,
6170         };
6171         struct rpc_task_setup task_setup_data = {
6172                 .rpc_client = lrp->clp->cl_rpcclient,
6173                 .rpc_message = &msg,
6174                 .callback_ops = &nfs4_layoutreturn_call_ops,
6175                 .callback_data = lrp,
6176         };
6177         int status;
6178
6179         dprintk("--> %s\n", __func__);
6180         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6181         task = rpc_run_task(&task_setup_data);
6182         if (IS_ERR(task))
6183                 return PTR_ERR(task);
6184         status = task->tk_status;
6185         dprintk("<-- %s status=%d\n", __func__, status);
6186         rpc_put_task(task);
6187         return status;
6188 }
6189
6190 /*
6191  * Retrieve the list of Data Server devices from the MDS.
6192  */
6193 static int _nfs4_getdevicelist(struct nfs_server *server,
6194                                     const struct nfs_fh *fh,
6195                                     struct pnfs_devicelist *devlist)
6196 {
6197         struct nfs4_getdevicelist_args args = {
6198                 .fh = fh,
6199                 .layoutclass = server->pnfs_curr_ld->id,
6200         };
6201         struct nfs4_getdevicelist_res res = {
6202                 .devlist = devlist,
6203         };
6204         struct rpc_message msg = {
6205                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6206                 .rpc_argp = &args,
6207                 .rpc_resp = &res,
6208         };
6209         int status;
6210
6211         dprintk("--> %s\n", __func__);
6212         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6213                                 &res.seq_res, 0);
6214         dprintk("<-- %s status=%d\n", __func__, status);
6215         return status;
6216 }
6217
6218 int nfs4_proc_getdevicelist(struct nfs_server *server,
6219                             const struct nfs_fh *fh,
6220                             struct pnfs_devicelist *devlist)
6221 {
6222         struct nfs4_exception exception = { };
6223         int err;
6224
6225         do {
6226                 err = nfs4_handle_exception(server,
6227                                 _nfs4_getdevicelist(server, fh, devlist),
6228                                 &exception);
6229         } while (exception.retry);
6230
6231         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6232                 err, devlist->num_devs);
6233
6234         return err;
6235 }
6236 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6237
6238 static int
6239 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6240 {
6241         struct nfs4_getdeviceinfo_args args = {
6242                 .pdev = pdev,
6243         };
6244         struct nfs4_getdeviceinfo_res res = {
6245                 .pdev = pdev,
6246         };
6247         struct rpc_message msg = {
6248                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
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, &res.seq_res, 0);
6256         dprintk("<-- %s status=%d\n", __func__, status);
6257
6258         return status;
6259 }
6260
6261 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6262 {
6263         struct nfs4_exception exception = { };
6264         int err;
6265
6266         do {
6267                 err = nfs4_handle_exception(server,
6268                                         _nfs4_proc_getdeviceinfo(server, pdev),
6269                                         &exception);
6270         } while (exception.retry);
6271         return err;
6272 }
6273 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6274
6275 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6276 {
6277         struct nfs4_layoutcommit_data *data = calldata;
6278         struct nfs_server *server = NFS_SERVER(data->args.inode);
6279         struct nfs4_session *session = nfs4_get_session(server);
6280
6281         nfs41_setup_sequence(session,
6282                         &data->args.seq_args,
6283                         &data->res.seq_res,
6284                         task);
6285 }
6286
6287 static void
6288 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6289 {
6290         struct nfs4_layoutcommit_data *data = calldata;
6291         struct nfs_server *server = NFS_SERVER(data->args.inode);
6292
6293         if (!nfs41_sequence_done(task, &data->res.seq_res))
6294                 return;
6295
6296         switch (task->tk_status) { /* Just ignore these failures */
6297         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6298         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6299         case -NFS4ERR_BADLAYOUT:     /* no layout */
6300         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6301                 task->tk_status = 0;
6302                 break;
6303         case 0:
6304                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6305                                                    data->res.fattr);
6306                 break;
6307         default:
6308                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6309                         rpc_restart_call_prepare(task);
6310                         return;
6311                 }
6312         }
6313 }
6314
6315 static void nfs4_layoutcommit_release(void *calldata)
6316 {
6317         struct nfs4_layoutcommit_data *data = calldata;
6318         struct pnfs_layout_segment *lseg, *tmp;
6319         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6320
6321         pnfs_cleanup_layoutcommit(data);
6322         /* Matched by references in pnfs_set_layoutcommit */
6323         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6324                 list_del_init(&lseg->pls_lc_list);
6325                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6326                                        &lseg->pls_flags))
6327                         pnfs_put_lseg(lseg);
6328         }
6329
6330         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6331         smp_mb__after_clear_bit();
6332         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6333
6334         put_rpccred(data->cred);
6335         kfree(data);
6336 }
6337
6338 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6339         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6340         .rpc_call_done = nfs4_layoutcommit_done,
6341         .rpc_release = nfs4_layoutcommit_release,
6342 };
6343
6344 int
6345 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6346 {
6347         struct rpc_message msg = {
6348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6349                 .rpc_argp = &data->args,
6350                 .rpc_resp = &data->res,
6351                 .rpc_cred = data->cred,
6352         };
6353         struct rpc_task_setup task_setup_data = {
6354                 .task = &data->task,
6355                 .rpc_client = NFS_CLIENT(data->args.inode),
6356                 .rpc_message = &msg,
6357                 .callback_ops = &nfs4_layoutcommit_ops,
6358                 .callback_data = data,
6359                 .flags = RPC_TASK_ASYNC,
6360         };
6361         struct rpc_task *task;
6362         int status = 0;
6363
6364         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6365                 "lbw: %llu inode %lu\n",
6366                 data->task.tk_pid, sync,
6367                 data->args.lastbytewritten,
6368                 data->args.inode->i_ino);
6369
6370         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6371         task = rpc_run_task(&task_setup_data);
6372         if (IS_ERR(task))
6373                 return PTR_ERR(task);
6374         if (sync == false)
6375                 goto out;
6376         status = nfs4_wait_for_completion_rpc_task(task);
6377         if (status != 0)
6378                 goto out;
6379         status = task->tk_status;
6380 out:
6381         dprintk("%s: status %d\n", __func__, status);
6382         rpc_put_task(task);
6383         return status;
6384 }
6385
6386 static int
6387 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6388                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6389 {
6390         struct nfs41_secinfo_no_name_args args = {
6391                 .style = SECINFO_STYLE_CURRENT_FH,
6392         };
6393         struct nfs4_secinfo_res res = {
6394                 .flavors = flavors,
6395         };
6396         struct rpc_message msg = {
6397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6398                 .rpc_argp = &args,
6399                 .rpc_resp = &res,
6400         };
6401         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6402 }
6403
6404 static int
6405 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6406                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6407 {
6408         struct nfs4_exception exception = { };
6409         int err;
6410         do {
6411                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6412                 switch (err) {
6413                 case 0:
6414                 case -NFS4ERR_WRONGSEC:
6415                 case -NFS4ERR_NOTSUPP:
6416                         goto out;
6417                 default:
6418                         err = nfs4_handle_exception(server, err, &exception);
6419                 }
6420         } while (exception.retry);
6421 out:
6422         return err;
6423 }
6424
6425 static int
6426 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6427                     struct nfs_fsinfo *info)
6428 {
6429         int err;
6430         struct page *page;
6431         rpc_authflavor_t flavor;
6432         struct nfs4_secinfo_flavors *flavors;
6433
6434         page = alloc_page(GFP_KERNEL);
6435         if (!page) {
6436                 err = -ENOMEM;
6437                 goto out;
6438         }
6439
6440         flavors = page_address(page);
6441         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6442
6443         /*
6444          * Fall back on "guess and check" method if
6445          * the server doesn't support SECINFO_NO_NAME
6446          */
6447         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6448                 err = nfs4_find_root_sec(server, fhandle, info);
6449                 goto out_freepage;
6450         }
6451         if (err)
6452                 goto out_freepage;
6453
6454         flavor = nfs_find_best_sec(flavors);
6455         if (err == 0)
6456                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6457
6458 out_freepage:
6459         put_page(page);
6460         if (err == -EACCES)
6461                 return -EPERM;
6462 out:
6463         return err;
6464 }
6465
6466 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6467 {
6468         int status;
6469         struct nfs41_test_stateid_args args = {
6470                 .stateid = stateid,
6471         };
6472         struct nfs41_test_stateid_res res;
6473         struct rpc_message msg = {
6474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6475                 .rpc_argp = &args,
6476                 .rpc_resp = &res,
6477         };
6478
6479         dprintk("NFS call  test_stateid %p\n", stateid);
6480         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6481         nfs4_set_sequence_privileged(&args.seq_args);
6482         status = nfs4_call_sync_sequence(server->client, server, &msg,
6483                         &args.seq_args, &res.seq_res);
6484         if (status != NFS_OK) {
6485                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6486                 return status;
6487         }
6488         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6489         return -res.status;
6490 }
6491
6492 /**
6493  * nfs41_test_stateid - perform a TEST_STATEID operation
6494  *
6495  * @server: server / transport on which to perform the operation
6496  * @stateid: state ID to test
6497  *
6498  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6499  * Otherwise a negative NFS4ERR value is returned if the operation
6500  * failed or the state ID is not currently valid.
6501  */
6502 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6503 {
6504         struct nfs4_exception exception = { };
6505         int err;
6506         do {
6507                 err = _nfs41_test_stateid(server, stateid);
6508                 if (err != -NFS4ERR_DELAY)
6509                         break;
6510                 nfs4_handle_exception(server, err, &exception);
6511         } while (exception.retry);
6512         return err;
6513 }
6514
6515 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6516 {
6517         struct nfs41_free_stateid_args args = {
6518                 .stateid = stateid,
6519         };
6520         struct nfs41_free_stateid_res res;
6521         struct rpc_message msg = {
6522                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6523                 .rpc_argp = &args,
6524                 .rpc_resp = &res,
6525         };
6526         int status;
6527
6528         dprintk("NFS call  free_stateid %p\n", stateid);
6529         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6530         nfs4_set_sequence_privileged(&args.seq_args);
6531         status = nfs4_call_sync_sequence(server->client, server, &msg,
6532                         &args.seq_args, &res.seq_res);
6533         dprintk("NFS reply free_stateid: %d\n", status);
6534         return status;
6535 }
6536
6537 /**
6538  * nfs41_free_stateid - perform a FREE_STATEID operation
6539  *
6540  * @server: server / transport on which to perform the operation
6541  * @stateid: state ID to release
6542  *
6543  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6544  * negative NFS4ERR value is returned.
6545  */
6546 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6547 {
6548         struct nfs4_exception exception = { };
6549         int err;
6550         do {
6551                 err = _nfs4_free_stateid(server, stateid);
6552                 if (err != -NFS4ERR_DELAY)
6553                         break;
6554                 nfs4_handle_exception(server, err, &exception);
6555         } while (exception.retry);
6556         return err;
6557 }
6558
6559 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6560                 const nfs4_stateid *s2)
6561 {
6562         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6563                 return false;
6564
6565         if (s1->seqid == s2->seqid)
6566                 return true;
6567         if (s1->seqid == 0 || s2->seqid == 0)
6568                 return true;
6569
6570         return false;
6571 }
6572
6573 #endif /* CONFIG_NFS_V4_1 */
6574
6575 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6576                 const nfs4_stateid *s2)
6577 {
6578         return nfs4_stateid_match(s1, s2);
6579 }
6580
6581
6582 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6583         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6584         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6585         .recover_open   = nfs4_open_reclaim,
6586         .recover_lock   = nfs4_lock_reclaim,
6587         .establish_clid = nfs4_init_clientid,
6588         .get_clid_cred  = nfs4_get_setclientid_cred,
6589         .detect_trunking = nfs40_discover_server_trunking,
6590 };
6591
6592 #if defined(CONFIG_NFS_V4_1)
6593 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6594         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6595         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6596         .recover_open   = nfs4_open_reclaim,
6597         .recover_lock   = nfs4_lock_reclaim,
6598         .establish_clid = nfs41_init_clientid,
6599         .get_clid_cred  = nfs4_get_exchange_id_cred,
6600         .reclaim_complete = nfs41_proc_reclaim_complete,
6601         .detect_trunking = nfs41_discover_server_trunking,
6602 };
6603 #endif /* CONFIG_NFS_V4_1 */
6604
6605 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6606         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6607         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6608         .recover_open   = nfs4_open_expired,
6609         .recover_lock   = nfs4_lock_expired,
6610         .establish_clid = nfs4_init_clientid,
6611         .get_clid_cred  = nfs4_get_setclientid_cred,
6612 };
6613
6614 #if defined(CONFIG_NFS_V4_1)
6615 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6616         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6617         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6618         .recover_open   = nfs41_open_expired,
6619         .recover_lock   = nfs41_lock_expired,
6620         .establish_clid = nfs41_init_clientid,
6621         .get_clid_cred  = nfs4_get_exchange_id_cred,
6622 };
6623 #endif /* CONFIG_NFS_V4_1 */
6624
6625 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6626         .sched_state_renewal = nfs4_proc_async_renew,
6627         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6628         .renew_lease = nfs4_proc_renew,
6629 };
6630
6631 #if defined(CONFIG_NFS_V4_1)
6632 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6633         .sched_state_renewal = nfs41_proc_async_sequence,
6634         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6635         .renew_lease = nfs4_proc_sequence,
6636 };
6637 #endif
6638
6639 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6640         .minor_version = 0,
6641         .call_sync = _nfs4_call_sync,
6642         .match_stateid = nfs4_match_stateid,
6643         .find_root_sec = nfs4_find_root_sec,
6644         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6645         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6646         .state_renewal_ops = &nfs40_state_renewal_ops,
6647 };
6648
6649 #if defined(CONFIG_NFS_V4_1)
6650 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6651         .minor_version = 1,
6652         .call_sync = nfs4_call_sync_sequence,
6653         .match_stateid = nfs41_match_stateid,
6654         .find_root_sec = nfs41_find_root_sec,
6655         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6656         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6657         .state_renewal_ops = &nfs41_state_renewal_ops,
6658 };
6659 #endif
6660
6661 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6662         [0] = &nfs_v4_0_minor_ops,
6663 #if defined(CONFIG_NFS_V4_1)
6664         [1] = &nfs_v4_1_minor_ops,
6665 #endif
6666 };
6667
6668 const struct inode_operations nfs4_dir_inode_operations = {
6669         .create         = nfs_create,
6670         .lookup         = nfs_lookup,
6671         .atomic_open    = nfs_atomic_open,
6672         .link           = nfs_link,
6673         .unlink         = nfs_unlink,
6674         .symlink        = nfs_symlink,
6675         .mkdir          = nfs_mkdir,
6676         .rmdir          = nfs_rmdir,
6677         .mknod          = nfs_mknod,
6678         .rename         = nfs_rename,
6679         .permission     = nfs_permission,
6680         .getattr        = nfs_getattr,
6681         .setattr        = nfs_setattr,
6682         .getxattr       = generic_getxattr,
6683         .setxattr       = generic_setxattr,
6684         .listxattr      = generic_listxattr,
6685         .removexattr    = generic_removexattr,
6686 };
6687
6688 static const struct inode_operations nfs4_file_inode_operations = {
6689         .permission     = nfs_permission,
6690         .getattr        = nfs_getattr,
6691         .setattr        = nfs_setattr,
6692         .getxattr       = generic_getxattr,
6693         .setxattr       = generic_setxattr,
6694         .listxattr      = generic_listxattr,
6695         .removexattr    = generic_removexattr,
6696 };
6697
6698 const struct nfs_rpc_ops nfs_v4_clientops = {
6699         .version        = 4,                    /* protocol version */
6700         .dentry_ops     = &nfs4_dentry_operations,
6701         .dir_inode_ops  = &nfs4_dir_inode_operations,
6702         .file_inode_ops = &nfs4_file_inode_operations,
6703         .file_ops       = &nfs4_file_operations,
6704         .getroot        = nfs4_proc_get_root,
6705         .submount       = nfs4_submount,
6706         .try_mount      = nfs4_try_mount,
6707         .getattr        = nfs4_proc_getattr,
6708         .setattr        = nfs4_proc_setattr,
6709         .lookup         = nfs4_proc_lookup,
6710         .access         = nfs4_proc_access,
6711         .readlink       = nfs4_proc_readlink,
6712         .create         = nfs4_proc_create,
6713         .remove         = nfs4_proc_remove,
6714         .unlink_setup   = nfs4_proc_unlink_setup,
6715         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6716         .unlink_done    = nfs4_proc_unlink_done,
6717         .rename         = nfs4_proc_rename,
6718         .rename_setup   = nfs4_proc_rename_setup,
6719         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6720         .rename_done    = nfs4_proc_rename_done,
6721         .link           = nfs4_proc_link,
6722         .symlink        = nfs4_proc_symlink,
6723         .mkdir          = nfs4_proc_mkdir,
6724         .rmdir          = nfs4_proc_remove,
6725         .readdir        = nfs4_proc_readdir,
6726         .mknod          = nfs4_proc_mknod,
6727         .statfs         = nfs4_proc_statfs,
6728         .fsinfo         = nfs4_proc_fsinfo,
6729         .pathconf       = nfs4_proc_pathconf,
6730         .set_capabilities = nfs4_server_capabilities,
6731         .decode_dirent  = nfs4_decode_dirent,
6732         .read_setup     = nfs4_proc_read_setup,
6733         .read_pageio_init = pnfs_pageio_init_read,
6734         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6735         .read_done      = nfs4_read_done,
6736         .write_setup    = nfs4_proc_write_setup,
6737         .write_pageio_init = pnfs_pageio_init_write,
6738         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6739         .write_done     = nfs4_write_done,
6740         .commit_setup   = nfs4_proc_commit_setup,
6741         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6742         .commit_done    = nfs4_commit_done,
6743         .lock           = nfs4_proc_lock,
6744         .clear_acl_cache = nfs4_zap_acl_attr,
6745         .close_context  = nfs4_close_context,
6746         .open_context   = nfs4_atomic_open,
6747         .have_delegation = nfs4_have_delegation,
6748         .return_delegation = nfs4_inode_return_delegation,
6749         .alloc_client   = nfs4_alloc_client,
6750         .init_client    = nfs4_init_client,
6751         .free_client    = nfs4_free_client,
6752         .create_server  = nfs4_create_server,
6753         .clone_server   = nfs_clone_server,
6754 };
6755
6756 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6757         .prefix = XATTR_NAME_NFSV4_ACL,
6758         .list   = nfs4_xattr_list_nfs4_acl,
6759         .get    = nfs4_xattr_get_nfs4_acl,
6760         .set    = nfs4_xattr_set_nfs4_acl,
6761 };
6762
6763 const struct xattr_handler *nfs4_xattr_handlers[] = {
6764         &nfs4_xattr_nfs4_acl_handler,
6765         NULL
6766 };
6767
6768 /*
6769  * Local variables:
6770  *  c-basic-offset: 8
6771  * End:
6772  */