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 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 383 {
 384         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 385         return true;
 386 }
 387
 388 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 389 {
 390         struct nfs4_session *session;
 391         struct nfs4_slot_table *tbl;
 392         bool send_new_highest_used_slotid = false;
 393
 394         if (!res->sr_slot) {
 395                 /* just wake up the next guy waiting since
 396                  * we may have not consumed a slot after all */
 397                 dprintk("%s: No slot\n", __func__);
 398                 return;
 399         }
 400         tbl = res->sr_slot->table;
 401         session = tbl->session;
 402
 403         spin_lock(&tbl->slot_tbl_lock);
 404         /* Be nice to the server: try to ensure that the last transmitted
 405          * value for highest_user_slotid <= target_highest_slotid
 406          */
 407         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 408                 send_new_highest_used_slotid = true;
 409
 410         nfs4_free_slot(tbl, res->sr_slot);
 411
 412         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 413                 send_new_highest_used_slotid = false;
 414         if (!nfs4_session_draining(session)) {
 415                 if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
 416                                 nfs4_set_task_privileged, NULL) != NULL)
 417                         send_new_highest_used_slotid = false;
 418         }
 419         spin_unlock(&tbl->slot_tbl_lock);
 420         res->sr_slot = NULL;
 421         if (send_new_highest_used_slotid)
 422                 nfs41_server_notify_highest_slotid_update(session->clp);
 423 }
 424
 425 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 426 {
 427         struct nfs4_session *session;
 428         struct nfs4_slot *slot;
 429         unsigned long timestamp;
 430         struct nfs_client *clp;
 431
 432         /*
 433          * sr_status remains 1 if an RPC level error occurred. The server
 434          * may or may not have processed the sequence operation..
 435          * Proceed as if the server received and processed the sequence
 436          * operation.
 437          */
 438         if (res->sr_status == 1)
 439                 res->sr_status = NFS_OK;
 440
 441         /* don't increment the sequence number if the task wasn't sent */
 442         if (!RPC_WAS_SENT(task))
 443                 goto out;
 444
 445         slot = res->sr_slot;
 446         session = slot->table->session;
 447
 448         /* Check the SEQUENCE operation status */
 449         switch (res->sr_status) {
 450         case 0:
 451                 /* Update the slot's sequence and clientid lease timer */
 452                 ++slot->seq_nr;
 453                 timestamp = slot->renewal_time;
 454                 clp = session->clp;
 455                 do_renew_lease(clp, timestamp);
 456                 /* Check sequence flags */
 457                 if (res->sr_status_flags != 0)
 458                         nfs4_schedule_lease_recovery(clp);
 459                 nfs41_update_target_slotid(slot->table, slot, res);
 460                 break;
 461         case -NFS4ERR_DELAY:
 462                 /* The server detected a resend of the RPC call and
 463                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 464                  * of RFC5661.
 465                  */
 466                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 467                         __func__,
 468                         slot->slot_nr,
 469                         slot->seq_nr);
 470                 goto out_retry;
 471         default:
 472                 /* Just update the slot sequence no. */
 473                 ++slot->seq_nr;
 474         }
 475 out:
 476         /* The session may be reset by one of the error handlers. */
 477         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 478         nfs41_sequence_free_slot(res);
 479         return 1;
 480 out_retry:
 481         if (!rpc_restart_call(task))
 482                 goto out;
 483         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 484         return 0;
 485 }
 486
 487 static int nfs4_sequence_done(struct rpc_task *task,
 488                                struct nfs4_sequence_res *res)
 489 {
 490         if (res->sr_slot == NULL)
 491                 return 1;
 492         return nfs41_sequence_done(task, res);
 493 }
 494
 495 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 496                 struct nfs4_sequence_res *res, int cache_reply)
 497 {
 498         args->sa_slot = NULL;
 499         args->sa_cache_this = 0;
 500         if (cache_reply)
 501                 args->sa_cache_this = 1;
 502         res->sr_slot = NULL;
 503 }
 504
 505 int nfs41_setup_sequence(struct nfs4_session *session,
 506                                 struct nfs4_sequence_args *args,
 507                                 struct nfs4_sequence_res *res,
 508                                 struct rpc_task *task)
 509 {
 510         struct nfs4_slot *slot;
 511         struct nfs4_slot_table *tbl;
 512
 513         dprintk("--> %s\n", __func__);
 514         /* slot already allocated? */
 515         if (res->sr_slot != NULL)
 516                 return 0;
 517
 518         tbl = &session->fc_slot_table;
 519
 520         task->tk_timeout = 0;
 521
 522         spin_lock(&tbl->slot_tbl_lock);
 523         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 524             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 525                 /* The state manager will wait until the slot table is empty */
 526                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 527                 spin_unlock(&tbl->slot_tbl_lock);
 528                 dprintk("%s session is draining\n", __func__);
 529                 return -EAGAIN;
 530         }
 531
 532         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 533             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 534                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 535                 spin_unlock(&tbl->slot_tbl_lock);
 536                 dprintk("%s enforce FIFO order\n", __func__);
 537                 return -EAGAIN;
 538         }
 539
 540         slot = nfs4_alloc_slot(tbl);
 541         if (IS_ERR(slot)) {
 542                 /* If out of memory, try again in 1/4 second */
 543                 if (slot == ERR_PTR(-ENOMEM))
 544                         task->tk_timeout = HZ >> 2;
 545                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 546                 spin_unlock(&tbl->slot_tbl_lock);
 547                 dprintk("<-- %s: no free slots\n", __func__);
 548                 return -EAGAIN;
 549         }
 550         spin_unlock(&tbl->slot_tbl_lock);
 551
 552         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 553
 554         args->sa_slot = slot;
 555
 556         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 557                         slot->slot_nr, slot->seq_nr);
 558
 559         res->sr_slot = slot;
 560         res->sr_status_flags = 0;
 561         /*
 562          * sr_status is only set in decode_sequence, and so will remain
 563          * set to 1 if an rpc level failure occurs.
 564          */
 565         res->sr_status = 1;
 566         return 0;
 567 }
 568 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 569
 570 int nfs4_setup_sequence(const struct nfs_server *server,
 571                         struct nfs4_sequence_args *args,
 572                         struct nfs4_sequence_res *res,
 573                         struct rpc_task *task)
 574 {
 575         struct nfs4_session *session = nfs4_get_session(server);
 576         int ret = 0;
 577
 578         if (session == NULL)
 579                 goto out;
 580
 581         dprintk("--> %s clp %p session %p sr_slot %d\n",
 582                 __func__, session->clp, session, res->sr_slot ?
 583                         res->sr_slot->slot_nr : -1);
 584
 585         ret = nfs41_setup_sequence(session, args, res, task);
 586 out:
 587         dprintk("<-- %s status=%d\n", __func__, ret);
 588         return ret;
 589 }
 590
 591 struct nfs41_call_sync_data {
 592         const struct nfs_server *seq_server;
 593         struct nfs4_sequence_args *seq_args;
 594         struct nfs4_sequence_res *seq_res;
 595 };
 596
 597 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 598 {
 599         struct nfs41_call_sync_data *data = calldata;
 600         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 601
 602         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 603
 604         if (nfs41_setup_sequence(session, data->seq_args,
 605                                 data->seq_res, task))
 606                 return;
 607         rpc_call_start(task);
 608 }
 609
 610 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 611 {
 612         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 613         nfs41_call_sync_prepare(task, calldata);
 614 }
 615
 616 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 617 {
 618         struct nfs41_call_sync_data *data = calldata;
 619
 620         nfs41_sequence_done(task, data->seq_res);
 621 }
 622
 623 static const struct rpc_call_ops nfs41_call_sync_ops = {
 624         .rpc_call_prepare = nfs41_call_sync_prepare,
 625         .rpc_call_done = nfs41_call_sync_done,
 626 };
 627
 628 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 629         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 630         .rpc_call_done = nfs41_call_sync_done,
 631 };
 632
 633 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 634                                    struct nfs_server *server,
 635                                    struct rpc_message *msg,
 636                                    struct nfs4_sequence_args *args,
 637                                    struct nfs4_sequence_res *res,
 638                                    int privileged)
 639 {
 640         int ret;
 641         struct rpc_task *task;
 642         struct nfs41_call_sync_data data = {
 643                 .seq_server = server,
 644                 .seq_args = args,
 645                 .seq_res = res,
 646         };
 647         struct rpc_task_setup task_setup = {
 648                 .rpc_client = clnt,
 649                 .rpc_message = msg,
 650                 .callback_ops = &nfs41_call_sync_ops,
 651                 .callback_data = &data
 652         };
 653
 654         if (privileged)
 655                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 656         task = rpc_run_task(&task_setup);
 657         if (IS_ERR(task))
 658                 ret = PTR_ERR(task);
 659         else {
 660                 ret = task->tk_status;
 661                 rpc_put_task(task);
 662         }
 663         return ret;
 664 }
 665
 666 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 667                             struct nfs_server *server,
 668                             struct rpc_message *msg,
 669                             struct nfs4_sequence_args *args,
 670                             struct nfs4_sequence_res *res,
 671                             int cache_reply)
 672 {
 673         nfs41_init_sequence(args, res, cache_reply);
 674         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 675 }
 676
 677 #else
 678 static inline
 679 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 680                 struct nfs4_sequence_res *res, int cache_reply)
 681 {
 682 }
 683
 684 static int nfs4_sequence_done(struct rpc_task *task,
 685                                struct nfs4_sequence_res *res)
 686 {
 687         return 1;
 688 }
 689 #endif /* CONFIG_NFS_V4_1 */
 690
 691 int _nfs4_call_sync(struct rpc_clnt *clnt,
 692                     struct nfs_server *server,
 693                     struct rpc_message *msg,
 694                     struct nfs4_sequence_args *args,
 695                     struct nfs4_sequence_res *res,
 696                     int cache_reply)
 697 {
 698         nfs41_init_sequence(args, res, cache_reply);
 699         return rpc_call_sync(clnt, msg, 0);
 700 }
 701
 702 static inline
 703 int nfs4_call_sync(struct rpc_clnt *clnt,
 704                    struct nfs_server *server,
 705                    struct rpc_message *msg,
 706                    struct nfs4_sequence_args *args,
 707                    struct nfs4_sequence_res *res,
 708                    int cache_reply)
 709 {
 710         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 711                                                 args, res, cache_reply);
 712 }
 713
 714 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 715 {
 716         struct nfs_inode *nfsi = NFS_I(dir);
 717
 718         spin_lock(&dir->i_lock);
 719         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 720         if (!cinfo->atomic || cinfo->before != dir->i_version)
 721                 nfs_force_lookup_revalidate(dir);
 722         dir->i_version = cinfo->after;
 723         spin_unlock(&dir->i_lock);
 724 }
 725
 726 struct nfs4_opendata {
 727         struct kref kref;
 728         struct nfs_openargs o_arg;
 729         struct nfs_openres o_res;
 730         struct nfs_open_confirmargs c_arg;
 731         struct nfs_open_confirmres c_res;
 732         struct nfs4_string owner_name;
 733         struct nfs4_string group_name;
 734         struct nfs_fattr f_attr;
 735         struct dentry *dir;
 736         struct dentry *dentry;
 737         struct nfs4_state_owner *owner;
 738         struct nfs4_state *state;
 739         struct iattr attrs;
 740         unsigned long timestamp;
 741         unsigned int rpc_done : 1;
 742         int rpc_status;
 743         int cancelled;
 744 };
 745
 746
 747 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 748 {
 749         p->o_res.f_attr = &p->f_attr;
 750         p->o_res.seqid = p->o_arg.seqid;
 751         p->c_res.seqid = p->c_arg.seqid;
 752         p->o_res.server = p->o_arg.server;
 753         p->o_res.access_request = p->o_arg.access;
 754         nfs_fattr_init(&p->f_attr);
 755         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 756 }
 757
 758 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 759                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 760                 const struct iattr *attrs,
 761                 gfp_t gfp_mask)
 762 {
 763         struct dentry *parent = dget_parent(dentry);
 764         struct inode *dir = parent->d_inode;
 765         struct nfs_server *server = NFS_SERVER(dir);
 766         struct nfs4_opendata *p;
 767
 768         p = kzalloc(sizeof(*p), gfp_mask);
 769         if (p == NULL)
 770                 goto err;
 771         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 772         if (p->o_arg.seqid == NULL)
 773                 goto err_free;
 774         nfs_sb_active(dentry->d_sb);
 775         p->dentry = dget(dentry);
 776         p->dir = parent;
 777         p->owner = sp;
 778         atomic_inc(&sp->so_count);
 779         p->o_arg.fh = NFS_FH(dir);
 780         p->o_arg.open_flags = flags;
 781         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 782         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 783          * will return permission denied for all bits until close */
 784         if (!(flags & O_EXCL)) {
 785                 /* ask server to check for all possible rights as results
 786                  * are cached */
 787                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 788                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 789         }
 790         p->o_arg.clientid = server->nfs_client->cl_clientid;
 791         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 792         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 793         p->o_arg.name = &dentry->d_name;
 794         p->o_arg.server = server;
 795         p->o_arg.bitmask = server->attr_bitmask;
 796         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 797         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 798         if (attrs != NULL && attrs->ia_valid != 0) {
 799                 __be32 verf[2];
 800
 801                 p->o_arg.u.attrs = &p->attrs;
 802                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 803
 804                 verf[0] = jiffies;
 805                 verf[1] = current->pid;
 806                 memcpy(p->o_arg.u.verifier.data, verf,
 807                                 sizeof(p->o_arg.u.verifier.data));
 808         }
 809         p->c_arg.fh = &p->o_res.fh;
 810         p->c_arg.stateid = &p->o_res.stateid;
 811         p->c_arg.seqid = p->o_arg.seqid;
 812         nfs4_init_opendata_res(p);
 813         kref_init(&p->kref);
 814         return p;
 815 err_free:
 816         kfree(p);
 817 err:
 818         dput(parent);
 819         return NULL;
 820 }
 821
 822 static void nfs4_opendata_free(struct kref *kref)
 823 {
 824         struct nfs4_opendata *p = container_of(kref,
 825                         struct nfs4_opendata, kref);
 826         struct super_block *sb = p->dentry->d_sb;
 827
 828         nfs_free_seqid(p->o_arg.seqid);
 829         if (p->state != NULL)
 830                 nfs4_put_open_state(p->state);
 831         nfs4_put_state_owner(p->owner);
 832         dput(p->dir);
 833         dput(p->dentry);
 834         nfs_sb_deactive(sb);
 835         nfs_fattr_free_names(&p->f_attr);
 836         kfree(p);
 837 }
 838
 839 static void nfs4_opendata_put(struct nfs4_opendata *p)
 840 {
 841         if (p != NULL)
 842                 kref_put(&p->kref, nfs4_opendata_free);
 843 }
 844
 845 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 846 {
 847         int ret;
 848
 849         ret = rpc_wait_for_completion_task(task);
 850         return ret;
 851 }
 852
 853 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 854 {
 855         int ret = 0;
 856
 857         if (open_mode & (O_EXCL|O_TRUNC))
 858                 goto out;
 859         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 860                 case FMODE_READ:
 861                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 862                                 && state->n_rdonly != 0;
 863                         break;
 864                 case FMODE_WRITE:
 865                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 866                                 && state->n_wronly != 0;
 867                         break;
 868                 case FMODE_READ|FMODE_WRITE:
 869                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 870                                 && state->n_rdwr != 0;
 871         }
 872 out:
 873         return ret;
 874 }
 875
 876 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 877 {
 878         if (delegation == NULL)
 879                 return 0;
 880         if ((delegation->type & fmode) != fmode)
 881                 return 0;
 882         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 883                 return 0;
 884         nfs_mark_delegation_referenced(delegation);
 885         return 1;
 886 }
 887
 888 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 889 {
 890         switch (fmode) {
 891                 case FMODE_WRITE:
 892                         state->n_wronly++;
 893                         break;
 894                 case FMODE_READ:
 895                         state->n_rdonly++;
 896                         break;
 897                 case FMODE_READ|FMODE_WRITE:
 898                         state->n_rdwr++;
 899         }
 900         nfs4_state_set_mode_locked(state, state->state | fmode);
 901 }
 902
 903 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 904 {
 905         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 906                 nfs4_stateid_copy(&state->stateid, stateid);
 907         nfs4_stateid_copy(&state->open_stateid, stateid);
 908         switch (fmode) {
 909                 case FMODE_READ:
 910                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 911                         break;
 912                 case FMODE_WRITE:
 913                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 914                         break;
 915                 case FMODE_READ|FMODE_WRITE:
 916                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 917         }
 918 }
 919
 920 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 921 {
 922         write_seqlock(&state->seqlock);
 923         nfs_set_open_stateid_locked(state, stateid, fmode);
 924         write_sequnlock(&state->seqlock);
 925 }
 926
 927 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 928 {
 929         /*
 930          * Protect the call to nfs4_state_set_mode_locked and
 931          * serialise the stateid update
 932          */
 933         write_seqlock(&state->seqlock);
 934         if (deleg_stateid != NULL) {
 935                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 936                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 937         }
 938         if (open_stateid != NULL)
 939                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 940         write_sequnlock(&state->seqlock);
 941         spin_lock(&state->owner->so_lock);
 942         update_open_stateflags(state, fmode);
 943         spin_unlock(&state->owner->so_lock);
 944 }
 945
 946 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 947 {
 948         struct nfs_inode *nfsi = NFS_I(state->inode);
 949         struct nfs_delegation *deleg_cur;
 950         int ret = 0;
 951
 952         fmode &= (FMODE_READ|FMODE_WRITE);
 953
 954         rcu_read_lock();
 955         deleg_cur = rcu_dereference(nfsi->delegation);
 956         if (deleg_cur == NULL)
 957                 goto no_delegation;
 958
 959         spin_lock(&deleg_cur->lock);
 960         if (nfsi->delegation != deleg_cur ||
 961             (deleg_cur->type & fmode) != fmode)
 962                 goto no_delegation_unlock;
 963
 964         if (delegation == NULL)
 965                 delegation = &deleg_cur->stateid;
 966         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 967                 goto no_delegation_unlock;
 968
 969         nfs_mark_delegation_referenced(deleg_cur);
 970         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 971         ret = 1;
 972 no_delegation_unlock:
 973         spin_unlock(&deleg_cur->lock);
 974 no_delegation:
 975         rcu_read_unlock();
 976
 977         if (!ret && open_stateid != NULL) {
 978                 __update_open_stateid(state, open_stateid, NULL, fmode);
 979                 ret = 1;
 980         }
 981
 982         return ret;
 983 }
 984
 985
 986 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 987 {
 988         struct nfs_delegation *delegation;
 989
 990         rcu_read_lock();
 991         delegation = rcu_dereference(NFS_I(inode)->delegation);
 992         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 993                 rcu_read_unlock();
 994                 return;
 995         }
 996         rcu_read_unlock();
 997         nfs4_inode_return_delegation(inode);
 998 }
 999
1000 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1001 {
1002         struct nfs4_state *state = opendata->state;
1003         struct nfs_inode *nfsi = NFS_I(state->inode);
1004         struct nfs_delegation *delegation;
1005         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1006         fmode_t fmode = opendata->o_arg.fmode;
1007         nfs4_stateid stateid;
1008         int ret = -EAGAIN;
1009
1010         for (;;) {
1011                 if (can_open_cached(state, fmode, open_mode)) {
1012                         spin_lock(&state->owner->so_lock);
1013                         if (can_open_cached(state, fmode, open_mode)) {
1014                                 update_open_stateflags(state, fmode);
1015                                 spin_unlock(&state->owner->so_lock);
1016                                 goto out_return_state;
1017                         }
1018                         spin_unlock(&state->owner->so_lock);
1019                 }
1020                 rcu_read_lock();
1021                 delegation = rcu_dereference(nfsi->delegation);
1022                 if (!can_open_delegated(delegation, fmode)) {
1023                         rcu_read_unlock();
1024                         break;
1025                 }
1026                 /* Save the delegation */
1027                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1028                 rcu_read_unlock();
1029                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1030                 if (ret != 0)
1031                         goto out;
1032                 ret = -EAGAIN;
1033
1034                 /* Try to update the stateid using the delegation */
1035                 if (update_open_stateid(state, NULL, &stateid, fmode))
1036                         goto out_return_state;
1037         }
1038 out:
1039         return ERR_PTR(ret);
1040 out_return_state:
1041         atomic_inc(&state->count);
1042         return state;
1043 }
1044
1045 static void
1046 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1047 {
1048         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1049         struct nfs_delegation *delegation;
1050         int delegation_flags = 0;
1051
1052         rcu_read_lock();
1053         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1054         if (delegation)
1055                 delegation_flags = delegation->flags;
1056         rcu_read_unlock();
1057         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1058                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1059                                    "returning a delegation for "
1060                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1061                                    clp->cl_hostname);
1062         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1063                 nfs_inode_set_delegation(state->inode,
1064                                          data->owner->so_cred,
1065                                          &data->o_res);
1066         else
1067                 nfs_inode_reclaim_delegation(state->inode,
1068                                              data->owner->so_cred,
1069                                              &data->o_res);
1070 }
1071
1072 /*
1073  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1074  * and update the nfs4_state.
1075  */
1076 static struct nfs4_state *
1077 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1078 {
1079         struct inode *inode = data->state->inode;
1080         struct nfs4_state *state = data->state;
1081         int ret;
1082
1083         if (!data->rpc_done) {
1084                 ret = data->rpc_status;
1085                 goto err;
1086         }
1087
1088         ret = -ESTALE;
1089         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1090             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1091             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1092                 goto err;
1093
1094         ret = -ENOMEM;
1095         state = nfs4_get_open_state(inode, data->owner);
1096         if (state == NULL)
1097                 goto err;
1098
1099         ret = nfs_refresh_inode(inode, &data->f_attr);
1100         if (ret)
1101                 goto err;
1102
1103         if (data->o_res.delegation_type != 0)
1104                 nfs4_opendata_check_deleg(data, state);
1105         update_open_stateid(state, &data->o_res.stateid, NULL,
1106                             data->o_arg.fmode);
1107
1108         return state;
1109 err:
1110         return ERR_PTR(ret);
1111
1112 }
1113
1114 static struct nfs4_state *
1115 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1116 {
1117         struct inode *inode;
1118         struct nfs4_state *state = NULL;
1119         int ret;
1120
1121         if (!data->rpc_done) {
1122                 state = nfs4_try_open_cached(data);
1123                 goto out;
1124         }
1125
1126         ret = -EAGAIN;
1127         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1128                 goto err;
1129         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1130         ret = PTR_ERR(inode);
1131         if (IS_ERR(inode))
1132                 goto err;
1133         ret = -ENOMEM;
1134         state = nfs4_get_open_state(inode, data->owner);
1135         if (state == NULL)
1136                 goto err_put_inode;
1137         if (data->o_res.delegation_type != 0)
1138                 nfs4_opendata_check_deleg(data, state);
1139         update_open_stateid(state, &data->o_res.stateid, NULL,
1140                         data->o_arg.fmode);
1141         iput(inode);
1142 out:
1143         return state;
1144 err_put_inode:
1145         iput(inode);
1146 err:
1147         return ERR_PTR(ret);
1148 }
1149
1150 static struct nfs4_state *
1151 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1152 {
1153         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1154                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1155         return _nfs4_opendata_to_nfs4_state(data);
1156 }
1157
1158 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1159 {
1160         struct nfs_inode *nfsi = NFS_I(state->inode);
1161         struct nfs_open_context *ctx;
1162
1163         spin_lock(&state->inode->i_lock);
1164         list_for_each_entry(ctx, &nfsi->open_files, list) {
1165                 if (ctx->state != state)
1166                         continue;
1167                 get_nfs_open_context(ctx);
1168                 spin_unlock(&state->inode->i_lock);
1169                 return ctx;
1170         }
1171         spin_unlock(&state->inode->i_lock);
1172         return ERR_PTR(-ENOENT);
1173 }
1174
1175 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1176 {
1177         struct nfs4_opendata *opendata;
1178
1179         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1180         if (opendata == NULL)
1181                 return ERR_PTR(-ENOMEM);
1182         opendata->state = state;
1183         atomic_inc(&state->count);
1184         return opendata;
1185 }
1186
1187 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1188 {
1189         struct nfs4_state *newstate;
1190         int ret;
1191
1192         opendata->o_arg.open_flags = 0;
1193         opendata->o_arg.fmode = fmode;
1194         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1195         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1196         nfs4_init_opendata_res(opendata);
1197         ret = _nfs4_recover_proc_open(opendata);
1198         if (ret != 0)
1199                 return ret;
1200         newstate = nfs4_opendata_to_nfs4_state(opendata);
1201         if (IS_ERR(newstate))
1202                 return PTR_ERR(newstate);
1203         nfs4_close_state(newstate, fmode);
1204         *res = newstate;
1205         return 0;
1206 }
1207
1208 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1209 {
1210         struct nfs4_state *newstate;
1211         int ret;
1212
1213         /* memory barrier prior to reading state->n_* */
1214         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1215         smp_rmb();
1216         if (state->n_rdwr != 0) {
1217                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1218                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1219                 if (ret != 0)
1220                         return ret;
1221                 if (newstate != state)
1222                         return -ESTALE;
1223         }
1224         if (state->n_wronly != 0) {
1225                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1226                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1227                 if (ret != 0)
1228                         return ret;
1229                 if (newstate != state)
1230                         return -ESTALE;
1231         }
1232         if (state->n_rdonly != 0) {
1233                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1234                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1235                 if (ret != 0)
1236                         return ret;
1237                 if (newstate != state)
1238                         return -ESTALE;
1239         }
1240         /*
1241          * We may have performed cached opens for all three recoveries.
1242          * Check if we need to update the current stateid.
1243          */
1244         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1245             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1246                 write_seqlock(&state->seqlock);
1247                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1248                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1249                 write_sequnlock(&state->seqlock);
1250         }
1251         return 0;
1252 }
1253
1254 /*
1255  * OPEN_RECLAIM:
1256  *      reclaim state on the server after a reboot.
1257  */
1258 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1259 {
1260         struct nfs_delegation *delegation;
1261         struct nfs4_opendata *opendata;
1262         fmode_t delegation_type = 0;
1263         int status;
1264
1265         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1266         if (IS_ERR(opendata))
1267                 return PTR_ERR(opendata);
1268         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1269         opendata->o_arg.fh = NFS_FH(state->inode);
1270         rcu_read_lock();
1271         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1272         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1273                 delegation_type = delegation->type;
1274         rcu_read_unlock();
1275         opendata->o_arg.u.delegation_type = delegation_type;
1276         status = nfs4_open_recover(opendata, state);
1277         nfs4_opendata_put(opendata);
1278         return status;
1279 }
1280
1281 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1282 {
1283         struct nfs_server *server = NFS_SERVER(state->inode);
1284         struct nfs4_exception exception = { };
1285         int err;
1286         do {
1287                 err = _nfs4_do_open_reclaim(ctx, state);
1288                 if (err != -NFS4ERR_DELAY)
1289                         break;
1290                 nfs4_handle_exception(server, err, &exception);
1291         } while (exception.retry);
1292         return err;
1293 }
1294
1295 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1296 {
1297         struct nfs_open_context *ctx;
1298         int ret;
1299
1300         ctx = nfs4_state_find_open_context(state);
1301         if (IS_ERR(ctx))
1302                 return PTR_ERR(ctx);
1303         ret = nfs4_do_open_reclaim(ctx, state);
1304         put_nfs_open_context(ctx);
1305         return ret;
1306 }
1307
1308 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1309 {
1310         struct nfs4_opendata *opendata;
1311         int ret;
1312
1313         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1314         if (IS_ERR(opendata))
1315                 return PTR_ERR(opendata);
1316         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1317         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1318         ret = nfs4_open_recover(opendata, state);
1319         nfs4_opendata_put(opendata);
1320         return ret;
1321 }
1322
1323 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1324 {
1325         struct nfs4_exception exception = { };
1326         struct nfs_server *server = NFS_SERVER(state->inode);
1327         int err;
1328         do {
1329                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1330                 switch (err) {
1331                         case 0:
1332                         case -ENOENT:
1333                         case -ESTALE:
1334                                 goto out;
1335                         case -NFS4ERR_BADSESSION:
1336                         case -NFS4ERR_BADSLOT:
1337                         case -NFS4ERR_BAD_HIGH_SLOT:
1338                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1339                         case -NFS4ERR_DEADSESSION:
1340                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1341                                 goto out;
1342                         case -NFS4ERR_STALE_CLIENTID:
1343                         case -NFS4ERR_STALE_STATEID:
1344                         case -NFS4ERR_EXPIRED:
1345                                 /* Don't recall a delegation if it was lost */
1346                                 nfs4_schedule_lease_recovery(server->nfs_client);
1347                                 goto out;
1348                         case -ERESTARTSYS:
1349                                 /*
1350                                  * The show must go on: exit, but mark the
1351                                  * stateid as needing recovery.
1352                                  */
1353                         case -NFS4ERR_DELEG_REVOKED:
1354                         case -NFS4ERR_ADMIN_REVOKED:
1355                         case -NFS4ERR_BAD_STATEID:
1356                                 nfs_inode_find_state_and_recover(state->inode,
1357                                                 stateid);
1358                                 nfs4_schedule_stateid_recovery(server, state);
1359                         case -EKEYEXPIRED:
1360                                 /*
1361                                  * User RPCSEC_GSS context has expired.
1362                                  * We cannot recover this stateid now, so
1363                                  * skip it and allow recovery thread to
1364                                  * proceed.
1365                                  */
1366                         case -ENOMEM:
1367                                 err = 0;
1368                                 goto out;
1369                 }
1370                 err = nfs4_handle_exception(server, err, &exception);
1371         } while (exception.retry);
1372 out:
1373         return err;
1374 }
1375
1376 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1377 {
1378         struct nfs4_opendata *data = calldata;
1379
1380         data->rpc_status = task->tk_status;
1381         if (data->rpc_status == 0) {
1382                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1383                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1384                 renew_lease(data->o_res.server, data->timestamp);
1385                 data->rpc_done = 1;
1386         }
1387 }
1388
1389 static void nfs4_open_confirm_release(void *calldata)
1390 {
1391         struct nfs4_opendata *data = calldata;
1392         struct nfs4_state *state = NULL;
1393
1394         /* If this request hasn't been cancelled, do nothing */
1395         if (data->cancelled == 0)
1396                 goto out_free;
1397         /* In case of error, no cleanup! */
1398         if (!data->rpc_done)
1399                 goto out_free;
1400         state = nfs4_opendata_to_nfs4_state(data);
1401         if (!IS_ERR(state))
1402                 nfs4_close_state(state, data->o_arg.fmode);
1403 out_free:
1404         nfs4_opendata_put(data);
1405 }
1406
1407 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1408         .rpc_call_done = nfs4_open_confirm_done,
1409         .rpc_release = nfs4_open_confirm_release,
1410 };
1411
1412 /*
1413  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1414  */
1415 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1416 {
1417         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1418         struct rpc_task *task;
1419         struct  rpc_message msg = {
1420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1421                 .rpc_argp = &data->c_arg,
1422                 .rpc_resp = &data->c_res,
1423                 .rpc_cred = data->owner->so_cred,
1424         };
1425         struct rpc_task_setup task_setup_data = {
1426                 .rpc_client = server->client,
1427                 .rpc_message = &msg,
1428                 .callback_ops = &nfs4_open_confirm_ops,
1429                 .callback_data = data,
1430                 .workqueue = nfsiod_workqueue,
1431                 .flags = RPC_TASK_ASYNC,
1432         };
1433         int status;
1434
1435         kref_get(&data->kref);
1436         data->rpc_done = 0;
1437         data->rpc_status = 0;
1438         data->timestamp = jiffies;
1439         task = rpc_run_task(&task_setup_data);
1440         if (IS_ERR(task))
1441                 return PTR_ERR(task);
1442         status = nfs4_wait_for_completion_rpc_task(task);
1443         if (status != 0) {
1444                 data->cancelled = 1;
1445                 smp_wmb();
1446         } else
1447                 status = data->rpc_status;
1448         rpc_put_task(task);
1449         return status;
1450 }
1451
1452 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1453 {
1454         struct nfs4_opendata *data = calldata;
1455         struct nfs4_state_owner *sp = data->owner;
1456
1457         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1458                 return;
1459         /*
1460          * Check if we still need to send an OPEN call, or if we can use
1461          * a delegation instead.
1462          */
1463         if (data->state != NULL) {
1464                 struct nfs_delegation *delegation;
1465
1466                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1467                         goto out_no_action;
1468                 rcu_read_lock();
1469                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1470                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1471                     can_open_delegated(delegation, data->o_arg.fmode))
1472                         goto unlock_no_action;
1473                 rcu_read_unlock();
1474         }
1475         /* Update client id. */
1476         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1477         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1478                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1479                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1480                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1481         }
1482         data->timestamp = jiffies;
1483         if (nfs4_setup_sequence(data->o_arg.server,
1484                                 &data->o_arg.seq_args,
1485                                 &data->o_res.seq_res,
1486                                 task) != 0)
1487                 nfs_release_seqid(data->o_arg.seqid);
1488         else
1489                 rpc_call_start(task);
1490         return;
1491 unlock_no_action:
1492         rcu_read_unlock();
1493 out_no_action:
1494         task->tk_action = NULL;
1495
1496 }
1497
1498 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1499 {
1500         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1501         nfs4_open_prepare(task, calldata);
1502 }
1503
1504 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1505 {
1506         struct nfs4_opendata *data = calldata;
1507
1508         data->rpc_status = task->tk_status;
1509
1510         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1511                 return;
1512
1513         if (task->tk_status == 0) {
1514                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1515                         switch (data->o_res.f_attr->mode & S_IFMT) {
1516                         case S_IFREG:
1517                                 break;
1518                         case S_IFLNK:
1519                                 data->rpc_status = -ELOOP;
1520                                 break;
1521                         case S_IFDIR:
1522                                 data->rpc_status = -EISDIR;
1523                                 break;
1524                         default:
1525                                 data->rpc_status = -ENOTDIR;
1526                         }
1527                 }
1528                 renew_lease(data->o_res.server, data->timestamp);
1529                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1530                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1531         }
1532         data->rpc_done = 1;
1533 }
1534
1535 static void nfs4_open_release(void *calldata)
1536 {
1537         struct nfs4_opendata *data = calldata;
1538         struct nfs4_state *state = NULL;
1539
1540         /* If this request hasn't been cancelled, do nothing */
1541         if (data->cancelled == 0)
1542                 goto out_free;
1543         /* In case of error, no cleanup! */
1544         if (data->rpc_status != 0 || !data->rpc_done)
1545                 goto out_free;
1546         /* In case we need an open_confirm, no cleanup! */
1547         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1548                 goto out_free;
1549         state = nfs4_opendata_to_nfs4_state(data);
1550         if (!IS_ERR(state))
1551                 nfs4_close_state(state, data->o_arg.fmode);
1552 out_free:
1553         nfs4_opendata_put(data);
1554 }
1555
1556 static const struct rpc_call_ops nfs4_open_ops = {
1557         .rpc_call_prepare = nfs4_open_prepare,
1558         .rpc_call_done = nfs4_open_done,
1559         .rpc_release = nfs4_open_release,
1560 };
1561
1562 static const struct rpc_call_ops nfs4_recover_open_ops = {
1563         .rpc_call_prepare = nfs4_recover_open_prepare,
1564         .rpc_call_done = nfs4_open_done,
1565         .rpc_release = nfs4_open_release,
1566 };
1567
1568 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1569 {
1570         struct inode *dir = data->dir->d_inode;
1571         struct nfs_server *server = NFS_SERVER(dir);
1572         struct nfs_openargs *o_arg = &data->o_arg;
1573         struct nfs_openres *o_res = &data->o_res;
1574         struct rpc_task *task;
1575         struct rpc_message msg = {
1576                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1577                 .rpc_argp = o_arg,
1578                 .rpc_resp = o_res,
1579                 .rpc_cred = data->owner->so_cred,
1580         };
1581         struct rpc_task_setup task_setup_data = {
1582                 .rpc_client = server->client,
1583                 .rpc_message = &msg,
1584                 .callback_ops = &nfs4_open_ops,
1585                 .callback_data = data,
1586                 .workqueue = nfsiod_workqueue,
1587                 .flags = RPC_TASK_ASYNC,
1588         };
1589         int status;
1590
1591         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1592         kref_get(&data->kref);
1593         data->rpc_done = 0;
1594         data->rpc_status = 0;
1595         data->cancelled = 0;
1596         if (isrecover)
1597                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1598         task = rpc_run_task(&task_setup_data);
1599         if (IS_ERR(task))
1600                 return PTR_ERR(task);
1601         status = nfs4_wait_for_completion_rpc_task(task);
1602         if (status != 0) {
1603                 data->cancelled = 1;
1604                 smp_wmb();
1605         } else
1606                 status = data->rpc_status;
1607         rpc_put_task(task);
1608
1609         return status;
1610 }
1611
1612 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1613 {
1614         struct inode *dir = data->dir->d_inode;
1615         struct nfs_openres *o_res = &data->o_res;
1616         int status;
1617
1618         status = nfs4_run_open_task(data, 1);
1619         if (status != 0 || !data->rpc_done)
1620                 return status;
1621
1622         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1623
1624         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1625                 status = _nfs4_proc_open_confirm(data);
1626                 if (status != 0)
1627                         return status;
1628         }
1629
1630         return status;
1631 }
1632
1633 static int nfs4_opendata_access(struct rpc_cred *cred,
1634                                 struct nfs4_opendata *opendata,
1635                                 struct nfs4_state *state, fmode_t fmode)
1636 {
1637         struct nfs_access_entry cache;
1638         u32 mask;
1639
1640         /* access call failed or for some reason the server doesn't
1641          * support any access modes -- defer access call until later */
1642         if (opendata->o_res.access_supported == 0)
1643                 return 0;
1644
1645         mask = 0;
1646         /* don't check MAY_WRITE - a newly created file may not have
1647          * write mode bits, but POSIX allows the creating process to write */
1648         if (fmode & FMODE_READ)
1649                 mask |= MAY_READ;
1650         if (fmode & FMODE_EXEC)
1651                 mask |= MAY_EXEC;
1652
1653         cache.cred = cred;
1654         cache.jiffies = jiffies;
1655         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1656         nfs_access_add_cache(state->inode, &cache);
1657
1658         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1659                 return 0;
1660
1661         /* even though OPEN succeeded, access is denied. Close the file */
1662         nfs4_close_state(state, fmode);
1663         return -EACCES;
1664 }
1665
1666 /*
1667  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1668  */
1669 static int _nfs4_proc_open(struct nfs4_opendata *data)
1670 {
1671         struct inode *dir = data->dir->d_inode;
1672         struct nfs_server *server = NFS_SERVER(dir);
1673         struct nfs_openargs *o_arg = &data->o_arg;
1674         struct nfs_openres *o_res = &data->o_res;
1675         int status;
1676
1677         status = nfs4_run_open_task(data, 0);
1678         if (!data->rpc_done)
1679                 return status;
1680         if (status != 0) {
1681                 if (status == -NFS4ERR_BADNAME &&
1682                                 !(o_arg->open_flags & O_CREAT))
1683                         return -ENOENT;
1684                 return status;
1685         }
1686
1687         nfs_fattr_map_and_free_names(server, &data->f_attr);
1688
1689         if (o_arg->open_flags & O_CREAT)
1690                 update_changeattr(dir, &o_res->cinfo);
1691         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1692                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1693         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1694                 status = _nfs4_proc_open_confirm(data);
1695                 if (status != 0)
1696                         return status;
1697         }
1698         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1699                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1700         return 0;
1701 }
1702
1703 static int nfs4_recover_expired_lease(struct nfs_server *server)
1704 {
1705         return nfs4_client_recover_expired_lease(server->nfs_client);
1706 }
1707
1708 /*
1709  * OPEN_EXPIRED:
1710  *      reclaim state on the server after a network partition.
1711  *      Assumes caller holds the appropriate lock
1712  */
1713 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1714 {
1715         struct nfs4_opendata *opendata;
1716         int ret;
1717
1718         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1719         if (IS_ERR(opendata))
1720                 return PTR_ERR(opendata);
1721         ret = nfs4_open_recover(opendata, state);
1722         if (ret == -ESTALE)
1723                 d_drop(ctx->dentry);
1724         nfs4_opendata_put(opendata);
1725         return ret;
1726 }
1727
1728 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1729 {
1730         struct nfs_server *server = NFS_SERVER(state->inode);
1731         struct nfs4_exception exception = { };
1732         int err;
1733
1734         do {
1735                 err = _nfs4_open_expired(ctx, state);
1736                 switch (err) {
1737                 default:
1738                         goto out;
1739                 case -NFS4ERR_GRACE:
1740                 case -NFS4ERR_DELAY:
1741                         nfs4_handle_exception(server, err, &exception);
1742                         err = 0;
1743                 }
1744         } while (exception.retry);
1745 out:
1746         return err;
1747 }
1748
1749 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1750 {
1751         struct nfs_open_context *ctx;
1752         int ret;
1753
1754         ctx = nfs4_state_find_open_context(state);
1755         if (IS_ERR(ctx))
1756                 return PTR_ERR(ctx);
1757         ret = nfs4_do_open_expired(ctx, state);
1758         put_nfs_open_context(ctx);
1759         return ret;
1760 }
1761
1762 #if defined(CONFIG_NFS_V4_1)
1763 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1764 {
1765         struct nfs_server *server = NFS_SERVER(state->inode);
1766         nfs4_stateid *stateid = &state->stateid;
1767         int status;
1768
1769         /* If a state reset has been done, test_stateid is unneeded */
1770         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1771                 return;
1772
1773         status = nfs41_test_stateid(server, stateid);
1774         if (status != NFS_OK) {
1775                 /* Free the stateid unless the server explicitly
1776                  * informs us the stateid is unrecognized. */
1777                 if (status != -NFS4ERR_BAD_STATEID)
1778                         nfs41_free_stateid(server, stateid);
1779                 nfs_remove_bad_delegation(state->inode);
1780
1781                 write_seqlock(&state->seqlock);
1782                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1783                 write_sequnlock(&state->seqlock);
1784                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1785         }
1786 }
1787
1788 /**
1789  * nfs41_check_open_stateid - possibly free an open stateid
1790  *
1791  * @state: NFSv4 state for an inode
1792  *
1793  * Returns NFS_OK if recovery for this stateid is now finished.
1794  * Otherwise a negative NFS4ERR value is returned.
1795  */
1796 static int nfs41_check_open_stateid(struct nfs4_state *state)
1797 {
1798         struct nfs_server *server = NFS_SERVER(state->inode);
1799         nfs4_stateid *stateid = &state->open_stateid;
1800         int status;
1801
1802         /* If a state reset has been done, test_stateid is unneeded */
1803         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1804             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1805             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1806                 return -NFS4ERR_BAD_STATEID;
1807
1808         status = nfs41_test_stateid(server, stateid);
1809         if (status != NFS_OK) {
1810                 /* Free the stateid unless the server explicitly
1811                  * informs us the stateid is unrecognized. */
1812                 if (status != -NFS4ERR_BAD_STATEID)
1813                         nfs41_free_stateid(server, stateid);
1814
1815                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1816                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1817                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1818         }
1819         return status;
1820 }
1821
1822 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1823 {
1824         int status;
1825
1826         nfs41_clear_delegation_stateid(state);
1827         status = nfs41_check_open_stateid(state);
1828         if (status != NFS_OK)
1829                 status = nfs4_open_expired(sp, state);
1830         return status;
1831 }
1832 #endif
1833
1834 /*
1835  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1836  * fields corresponding to attributes that were used to store the verifier.
1837  * Make sure we clobber those fields in the later setattr call
1838  */
1839 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1840 {
1841         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1842             !(sattr->ia_valid & ATTR_ATIME_SET))
1843                 sattr->ia_valid |= ATTR_ATIME;
1844
1845         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1846             !(sattr->ia_valid & ATTR_MTIME_SET))
1847                 sattr->ia_valid |= ATTR_MTIME;
1848 }
1849
1850 /*
1851  * Returns a referenced nfs4_state
1852  */
1853 static int _nfs4_do_open(struct inode *dir,
1854                         struct dentry *dentry,
1855                         fmode_t fmode,
1856                         int flags,
1857                         struct iattr *sattr,
1858                         struct rpc_cred *cred,
1859                         struct nfs4_state **res,
1860                         struct nfs4_threshold **ctx_th)
1861 {
1862         struct nfs4_state_owner  *sp;
1863         struct nfs4_state     *state = NULL;
1864         struct nfs_server       *server = NFS_SERVER(dir);
1865         struct nfs4_opendata *opendata;
1866         int status;
1867
1868         /* Protect against reboot recovery conflicts */
1869         status = -ENOMEM;
1870         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1871         if (sp == NULL) {
1872                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1873                 goto out_err;
1874         }
1875         status = nfs4_recover_expired_lease(server);
1876         if (status != 0)
1877                 goto err_put_state_owner;
1878         if (dentry->d_inode != NULL)
1879                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1880         status = -ENOMEM;
1881         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1882         if (opendata == NULL)
1883                 goto err_put_state_owner;
1884
1885         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1886                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1887                 if (!opendata->f_attr.mdsthreshold)
1888                         goto err_opendata_put;
1889                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1890         }
1891         if (dentry->d_inode != NULL)
1892                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1893
1894         status = _nfs4_proc_open(opendata);
1895         if (status != 0)
1896                 goto err_opendata_put;
1897
1898         state = nfs4_opendata_to_nfs4_state(opendata);
1899         status = PTR_ERR(state);
1900         if (IS_ERR(state))
1901                 goto err_opendata_put;
1902         if (server->caps & NFS_CAP_POSIX_LOCK)
1903                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1904
1905         status = nfs4_opendata_access(cred, opendata, state, fmode);
1906         if (status != 0)
1907                 goto err_opendata_put;
1908
1909         if (opendata->o_arg.open_flags & O_EXCL) {
1910                 nfs4_exclusive_attrset(opendata, sattr);
1911
1912                 nfs_fattr_init(opendata->o_res.f_attr);
1913                 status = nfs4_do_setattr(state->inode, cred,
1914                                 opendata->o_res.f_attr, sattr,
1915                                 state);
1916                 if (status == 0)
1917                         nfs_setattr_update_inode(state->inode, sattr);
1918                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1919         }
1920
1921         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1922                 *ctx_th = opendata->f_attr.mdsthreshold;
1923         else
1924                 kfree(opendata->f_attr.mdsthreshold);
1925         opendata->f_attr.mdsthreshold = NULL;
1926
1927         nfs4_opendata_put(opendata);
1928         nfs4_put_state_owner(sp);
1929         *res = state;
1930         return 0;
1931 err_opendata_put:
1932         kfree(opendata->f_attr.mdsthreshold);
1933         nfs4_opendata_put(opendata);
1934 err_put_state_owner:
1935         nfs4_put_state_owner(sp);
1936 out_err:
1937         *res = NULL;
1938         return status;
1939 }
1940
1941
1942 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1943                                         struct dentry *dentry,
1944                                         fmode_t fmode,
1945                                         int flags,
1946                                         struct iattr *sattr,
1947                                         struct rpc_cred *cred,
1948                                         struct nfs4_threshold **ctx_th)
1949 {
1950         struct nfs4_exception exception = { };
1951         struct nfs4_state *res;
1952         int status;
1953
1954         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1955         do {
1956                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1957                                        &res, ctx_th);
1958                 if (status == 0)
1959                         break;
1960                 /* NOTE: BAD_SEQID means the server and client disagree about the
1961                  * book-keeping w.r.t. state-changing operations
1962                  * (OPEN/CLOSE/LOCK/LOCKU...)
1963                  * It is actually a sign of a bug on the client or on the server.
1964                  *
1965                  * If we receive a BAD_SEQID error in the particular case of
1966                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1967                  * have unhashed the old state_owner for us, and that we can
1968                  * therefore safely retry using a new one. We should still warn
1969                  * the user though...
1970                  */
1971                 if (status == -NFS4ERR_BAD_SEQID) {
1972                         pr_warn_ratelimited("NFS: v4 server %s "
1973                                         " returned a bad sequence-id error!\n",
1974                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1975                         exception.retry = 1;
1976                         continue;
1977                 }
1978                 /*
1979                  * BAD_STATEID on OPEN means that the server cancelled our
1980                  * state before it received the OPEN_CONFIRM.
1981                  * Recover by retrying the request as per the discussion
1982                  * on Page 181 of RFC3530.
1983                  */
1984                 if (status == -NFS4ERR_BAD_STATEID) {
1985                         exception.retry = 1;
1986                         continue;
1987                 }
1988                 if (status == -EAGAIN) {
1989                         /* We must have found a delegation */
1990                         exception.retry = 1;
1991                         continue;
1992                 }
1993                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1994                                         status, &exception));
1995         } while (exception.retry);
1996         return res;
1997 }
1998
1999 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2000                             struct nfs_fattr *fattr, struct iattr *sattr,
2001                             struct nfs4_state *state)
2002 {
2003         struct nfs_server *server = NFS_SERVER(inode);
2004         struct nfs_setattrargs  arg = {
2005                 .fh             = NFS_FH(inode),
2006                 .iap            = sattr,
2007                 .server         = server,
2008                 .bitmask = server->attr_bitmask,
2009         };
2010         struct nfs_setattrres  res = {
2011                 .fattr          = fattr,
2012                 .server         = server,
2013         };
2014         struct rpc_message msg = {
2015                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2016                 .rpc_argp       = &arg,
2017                 .rpc_resp       = &res,
2018                 .rpc_cred       = cred,
2019         };
2020         unsigned long timestamp = jiffies;
2021         int status;
2022
2023         nfs_fattr_init(fattr);
2024
2025         if (state != NULL) {
2026                 struct nfs_lockowner lockowner = {
2027                         .l_owner = current->files,
2028                         .l_pid = current->tgid,
2029                 };
2030                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2031                                 &lockowner);
2032         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2033                                 FMODE_WRITE)) {
2034                 /* Use that stateid */
2035         } else
2036                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2037
2038         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2039         if (status == 0 && state != NULL)
2040                 renew_lease(server, timestamp);
2041         return status;
2042 }
2043
2044 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2045                            struct nfs_fattr *fattr, struct iattr *sattr,
2046                            struct nfs4_state *state)
2047 {
2048         struct nfs_server *server = NFS_SERVER(inode);
2049         struct nfs4_exception exception = {
2050                 .state = state,
2051                 .inode = inode,
2052         };
2053         int err;
2054         do {
2055                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2056                 switch (err) {
2057                 case -NFS4ERR_OPENMODE:
2058                         if (state && !(state->state & FMODE_WRITE)) {
2059                                 err = -EBADF;
2060                                 if (sattr->ia_valid & ATTR_OPEN)
2061                                         err = -EACCES;
2062                                 goto out;
2063                         }
2064                 }
2065                 err = nfs4_handle_exception(server, err, &exception);
2066         } while (exception.retry);
2067 out:
2068         return err;
2069 }
2070
2071 struct nfs4_closedata {
2072         struct inode *inode;
2073         struct nfs4_state *state;
2074         struct nfs_closeargs arg;
2075         struct nfs_closeres res;
2076         struct nfs_fattr fattr;
2077         unsigned long timestamp;
2078         bool roc;
2079         u32 roc_barrier;
2080 };
2081
2082 static void nfs4_free_closedata(void *data)
2083 {
2084         struct nfs4_closedata *calldata = data;
2085         struct nfs4_state_owner *sp = calldata->state->owner;
2086         struct super_block *sb = calldata->state->inode->i_sb;
2087
2088         if (calldata->roc)
2089                 pnfs_roc_release(calldata->state->inode);
2090         nfs4_put_open_state(calldata->state);
2091         nfs_free_seqid(calldata->arg.seqid);
2092         nfs4_put_state_owner(sp);
2093         nfs_sb_deactive_async(sb);
2094         kfree(calldata);
2095 }
2096
2097 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2098                 fmode_t fmode)
2099 {
2100         spin_lock(&state->owner->so_lock);
2101         if (!(fmode & FMODE_READ))
2102                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2103         if (!(fmode & FMODE_WRITE))
2104                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2105         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2106         spin_unlock(&state->owner->so_lock);
2107 }
2108
2109 static void nfs4_close_done(struct rpc_task *task, void *data)
2110 {
2111         struct nfs4_closedata *calldata = data;
2112         struct nfs4_state *state = calldata->state;
2113         struct nfs_server *server = NFS_SERVER(calldata->inode);
2114
2115         dprintk("%s: begin!\n", __func__);
2116         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2117                 return;
2118         /* hmm. we are done with the inode, and in the process of freeing
2119          * the state_owner. we keep this around to process errors
2120          */
2121         switch (task->tk_status) {
2122                 case 0:
2123                         if (calldata->roc)
2124                                 pnfs_roc_set_barrier(state->inode,
2125                                                      calldata->roc_barrier);
2126                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2127                         renew_lease(server, calldata->timestamp);
2128                         nfs4_close_clear_stateid_flags(state,
2129                                         calldata->arg.fmode);
2130                         break;
2131                 case -NFS4ERR_STALE_STATEID:
2132                 case -NFS4ERR_OLD_STATEID:
2133                 case -NFS4ERR_BAD_STATEID:
2134                 case -NFS4ERR_EXPIRED:
2135                         if (calldata->arg.fmode == 0)
2136                                 break;
2137                 default:
2138                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2139                                 rpc_restart_call_prepare(task);
2140         }
2141         nfs_release_seqid(calldata->arg.seqid);
2142         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2143         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2144 }
2145
2146 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2147 {
2148         struct nfs4_closedata *calldata = data;
2149         struct nfs4_state *state = calldata->state;
2150         struct inode *inode = calldata->inode;
2151         int call_close = 0;
2152
2153         dprintk("%s: begin!\n", __func__);
2154         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2155                 return;
2156
2157         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2158         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2159         spin_lock(&state->owner->so_lock);
2160         /* Calculate the change in open mode */
2161         if (state->n_rdwr == 0) {
2162                 if (state->n_rdonly == 0) {
2163                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2164                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2165                         calldata->arg.fmode &= ~FMODE_READ;
2166                 }
2167                 if (state->n_wronly == 0) {
2168                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2169                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2170                         calldata->arg.fmode &= ~FMODE_WRITE;
2171                 }
2172         }
2173         spin_unlock(&state->owner->so_lock);
2174
2175         if (!call_close) {
2176                 /* Note: exit _without_ calling nfs4_close_done */
2177                 task->tk_action = NULL;
2178                 goto out;
2179         }
2180
2181         if (calldata->arg.fmode == 0) {
2182                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2183                 if (calldata->roc &&
2184                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2185                         goto out;
2186         }
2187
2188         nfs_fattr_init(calldata->res.fattr);
2189         calldata->timestamp = jiffies;
2190         if (nfs4_setup_sequence(NFS_SERVER(inode),
2191                                 &calldata->arg.seq_args,
2192                                 &calldata->res.seq_res,
2193                                 task) != 0)
2194                 nfs_release_seqid(calldata->arg.seqid);
2195         else
2196                 rpc_call_start(task);
2197 out:
2198         dprintk("%s: done!\n", __func__);
2199 }
2200
2201 static const struct rpc_call_ops nfs4_close_ops = {
2202         .rpc_call_prepare = nfs4_close_prepare,
2203         .rpc_call_done = nfs4_close_done,
2204         .rpc_release = nfs4_free_closedata,
2205 };
2206
2207 /*
2208  * It is possible for data to be read/written from a mem-mapped file
2209  * after the sys_close call (which hits the vfs layer as a flush).
2210  * This means that we can't safely call nfsv4 close on a file until
2211  * the inode is cleared. This in turn means that we are not good
2212  * NFSv4 citizens - we do not indicate to the server to update the file's
2213  * share state even when we are done with one of the three share
2214  * stateid's in the inode.
2215  *
2216  * NOTE: Caller must be holding the sp->so_owner semaphore!
2217  */
2218 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2219 {
2220         struct nfs_server *server = NFS_SERVER(state->inode);
2221         struct nfs4_closedata *calldata;
2222         struct nfs4_state_owner *sp = state->owner;
2223         struct rpc_task *task;
2224         struct rpc_message msg = {
2225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2226                 .rpc_cred = state->owner->so_cred,
2227         };
2228         struct rpc_task_setup task_setup_data = {
2229                 .rpc_client = server->client,
2230                 .rpc_message = &msg,
2231                 .callback_ops = &nfs4_close_ops,
2232                 .workqueue = nfsiod_workqueue,
2233                 .flags = RPC_TASK_ASYNC,
2234         };
2235         int status = -ENOMEM;
2236
2237         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2238         if (calldata == NULL)
2239                 goto out;
2240         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2241         calldata->inode = state->inode;
2242         calldata->state = state;
2243         calldata->arg.fh = NFS_FH(state->inode);
2244         calldata->arg.stateid = &state->open_stateid;
2245         /* Serialization for the sequence id */
2246         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2247         if (calldata->arg.seqid == NULL)
2248                 goto out_free_calldata;
2249         calldata->arg.fmode = 0;
2250         calldata->arg.bitmask = server->cache_consistency_bitmask;
2251         calldata->res.fattr = &calldata->fattr;
2252         calldata->res.seqid = calldata->arg.seqid;
2253         calldata->res.server = server;
2254         calldata->roc = pnfs_roc(state->inode);
2255         nfs_sb_active(calldata->inode->i_sb);
2256
2257         msg.rpc_argp = &calldata->arg;
2258         msg.rpc_resp = &calldata->res;
2259         task_setup_data.callback_data = calldata;
2260         task = rpc_run_task(&task_setup_data);
2261         if (IS_ERR(task))
2262                 return PTR_ERR(task);
2263         status = 0;
2264         if (wait)
2265                 status = rpc_wait_for_completion_task(task);
2266         rpc_put_task(task);
2267         return status;
2268 out_free_calldata:
2269         kfree(calldata);
2270 out:
2271         nfs4_put_open_state(state);
2272         nfs4_put_state_owner(sp);
2273         return status;
2274 }
2275
2276 static struct inode *
2277 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2278 {
2279         struct nfs4_state *state;
2280
2281         /* Protect against concurrent sillydeletes */
2282         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2283                              ctx->cred, &ctx->mdsthreshold);
2284         if (IS_ERR(state))
2285                 return ERR_CAST(state);
2286         ctx->state = state;
2287         return igrab(state->inode);
2288 }
2289
2290 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2291 {
2292         if (ctx->state == NULL)
2293                 return;
2294         if (is_sync)
2295                 nfs4_close_sync(ctx->state, ctx->mode);
2296         else
2297                 nfs4_close_state(ctx->state, ctx->mode);
2298 }
2299
2300 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2301 {
2302         struct nfs4_server_caps_arg args = {
2303                 .fhandle = fhandle,
2304         };
2305         struct nfs4_server_caps_res res = {};
2306         struct rpc_message msg = {
2307                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2308                 .rpc_argp = &args,
2309                 .rpc_resp = &res,
2310         };
2311         int status;
2312
2313         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2314         if (status == 0) {
2315                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2316                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2317                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2318                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2319                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2320                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2321                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2322                         server->caps |= NFS_CAP_ACLS;
2323                 if (res.has_links != 0)
2324                         server->caps |= NFS_CAP_HARDLINKS;
2325                 if (res.has_symlinks != 0)
2326                         server->caps |= NFS_CAP_SYMLINKS;
2327                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2328                         server->caps |= NFS_CAP_FILEID;
2329                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2330                         server->caps |= NFS_CAP_MODE;
2331                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2332                         server->caps |= NFS_CAP_NLINK;
2333                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2334                         server->caps |= NFS_CAP_OWNER;
2335                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2336                         server->caps |= NFS_CAP_OWNER_GROUP;
2337                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2338                         server->caps |= NFS_CAP_ATIME;
2339                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2340                         server->caps |= NFS_CAP_CTIME;
2341                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2342                         server->caps |= NFS_CAP_MTIME;
2343
2344                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2345                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2346                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2347                 server->acl_bitmask = res.acl_bitmask;
2348                 server->fh_expire_type = res.fh_expire_type;
2349         }
2350
2351         return status;
2352 }
2353
2354 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2355 {
2356         struct nfs4_exception exception = { };
2357         int err;
2358         do {
2359                 err = nfs4_handle_exception(server,
2360                                 _nfs4_server_capabilities(server, fhandle),
2361                                 &exception);
2362         } while (exception.retry);
2363         return err;
2364 }
2365
2366 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2367                 struct nfs_fsinfo *info)
2368 {
2369         struct nfs4_lookup_root_arg args = {
2370                 .bitmask = nfs4_fattr_bitmap,
2371         };
2372         struct nfs4_lookup_res res = {
2373                 .server = server,
2374                 .fattr = info->fattr,
2375                 .fh = fhandle,
2376         };
2377         struct rpc_message msg = {
2378                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2379                 .rpc_argp = &args,
2380                 .rpc_resp = &res,
2381         };
2382
2383         nfs_fattr_init(info->fattr);
2384         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2385 }
2386
2387 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2388                 struct nfs_fsinfo *info)
2389 {
2390         struct nfs4_exception exception = { };
2391         int err;
2392         do {
2393                 err = _nfs4_lookup_root(server, fhandle, info);
2394                 switch (err) {
2395                 case 0:
2396                 case -NFS4ERR_WRONGSEC:
2397                         goto out;
2398                 default:
2399                         err = nfs4_handle_exception(server, err, &exception);
2400                 }
2401         } while (exception.retry);
2402 out:
2403         return err;
2404 }
2405
2406 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2407                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2408 {
2409         struct rpc_auth *auth;
2410         int ret;
2411
2412         auth = rpcauth_create(flavor, server->client);
2413         if (IS_ERR(auth)) {
2414                 ret = -EIO;
2415                 goto out;
2416         }
2417         ret = nfs4_lookup_root(server, fhandle, info);
2418 out:
2419         return ret;
2420 }
2421
2422 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2423                               struct nfs_fsinfo *info)
2424 {
2425         int i, len, status = 0;
2426         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2427
2428         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2429         if (len < 0)
2430                 return len;
2431
2432         for (i = 0; i < len; i++) {
2433                 /* AUTH_UNIX is the default flavor if none was specified,
2434                  * thus has already been tried. */
2435                 if (flav_array[i] == RPC_AUTH_UNIX)
2436                         continue;
2437
2438                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2439                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2440                         continue;
2441                 break;
2442         }
2443         /*
2444          * -EACCESS could mean that the user doesn't have correct permissions
2445          * to access the mount.  It could also mean that we tried to mount
2446          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2447          * existing mount programs don't handle -EACCES very well so it should
2448          * be mapped to -EPERM instead.
2449          */
2450         if (status == -EACCES)
2451                 status = -EPERM;
2452         return status;
2453 }
2454
2455 /*
2456  * get the file handle for the "/" directory on the server
2457  */
2458 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2459                          struct nfs_fsinfo *info)
2460 {
2461         int minor_version = server->nfs_client->cl_minorversion;
2462         int status = nfs4_lookup_root(server, fhandle, info);
2463         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2464                 /*
2465                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2466                  * by nfs4_map_errors() as this function exits.
2467                  */
2468                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2469         if (status == 0)
2470                 status = nfs4_server_capabilities(server, fhandle);
2471         if (status == 0)
2472                 status = nfs4_do_fsinfo(server, fhandle, info);
2473         return nfs4_map_errors(status);
2474 }
2475
2476 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2477                               struct nfs_fsinfo *info)
2478 {
2479         int error;
2480         struct nfs_fattr *fattr = info->fattr;
2481
2482         error = nfs4_server_capabilities(server, mntfh);
2483         if (error < 0) {
2484                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2485                 return error;
2486         }
2487
2488         error = nfs4_proc_getattr(server, mntfh, fattr);
2489         if (error < 0) {
2490                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2491                 return error;
2492         }
2493
2494         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2495             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2496                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2497
2498         return error;
2499 }
2500
2501 /*
2502  * Get locations and (maybe) other attributes of a referral.
2503  * Note that we'll actually follow the referral later when
2504  * we detect fsid mismatch in inode revalidation
2505  */
2506 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2507                              const struct qstr *name, struct nfs_fattr *fattr,
2508                              struct nfs_fh *fhandle)
2509 {
2510         int status = -ENOMEM;
2511         struct page *page = NULL;
2512         struct nfs4_fs_locations *locations = NULL;
2513
2514         page = alloc_page(GFP_KERNEL);
2515         if (page == NULL)
2516                 goto out;
2517         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2518         if (locations == NULL)
2519                 goto out;
2520
2521         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2522         if (status != 0)
2523                 goto out;
2524         /* Make sure server returned a different fsid for the referral */
2525         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2526                 dprintk("%s: server did not return a different fsid for"
2527                         " a referral at %s\n", __func__, name->name);
2528                 status = -EIO;
2529                 goto out;
2530         }
2531         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2532         nfs_fixup_referral_attributes(&locations->fattr);
2533
2534         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2535         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2536         memset(fhandle, 0, sizeof(struct nfs_fh));
2537 out:
2538         if (page)
2539                 __free_page(page);
2540         kfree(locations);
2541         return status;
2542 }
2543
2544 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2545 {
2546         struct nfs4_getattr_arg args = {
2547                 .fh = fhandle,
2548                 .bitmask = server->attr_bitmask,
2549         };
2550         struct nfs4_getattr_res res = {
2551                 .fattr = fattr,
2552                 .server = server,
2553         };
2554         struct rpc_message msg = {
2555                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2556                 .rpc_argp = &args,
2557                 .rpc_resp = &res,
2558         };
2559
2560         nfs_fattr_init(fattr);
2561         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2562 }
2563
2564 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2565 {
2566         struct nfs4_exception exception = { };
2567         int err;
2568         do {
2569                 err = nfs4_handle_exception(server,
2570                                 _nfs4_proc_getattr(server, fhandle, fattr),
2571                                 &exception);
2572         } while (exception.retry);
2573         return err;
2574 }
2575
2576 /*
2577  * The file is not closed if it is opened due to the a request to change
2578  * the size of the file. The open call will not be needed once the
2579  * VFS layer lookup-intents are implemented.
2580  *
2581  * Close is called when the inode is destroyed.
2582  * If we haven't opened the file for O_WRONLY, we
2583  * need to in the size_change case to obtain a stateid.
2584  *
2585  * Got race?
2586  * Because OPEN is always done by name in nfsv4, it is
2587  * possible that we opened a different file by the same
2588  * name.  We can recognize this race condition, but we
2589  * can't do anything about it besides returning an error.
2590  *
2591  * This will be fixed with VFS changes (lookup-intent).
2592  */
2593 static int
2594 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2595                   struct iattr *sattr)
2596 {
2597         struct inode *inode = dentry->d_inode;
2598         struct rpc_cred *cred = NULL;
2599         struct nfs4_state *state = NULL;
2600         int status;
2601
2602         if (pnfs_ld_layoutret_on_setattr(inode))
2603                 pnfs_return_layout(inode);
2604
2605         nfs_fattr_init(fattr);
2606
2607         /* Deal with open(O_TRUNC) */
2608         if (sattr->ia_valid & ATTR_OPEN)
2609                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2610
2611         /* Optimization: if the end result is no change, don't RPC */
2612         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2613                 return 0;
2614
2615         /* Search for an existing open(O_WRITE) file */
2616         if (sattr->ia_valid & ATTR_FILE) {
2617                 struct nfs_open_context *ctx;
2618
2619                 ctx = nfs_file_open_context(sattr->ia_file);
2620                 if (ctx) {
2621                         cred = ctx->cred;
2622                         state = ctx->state;
2623                 }
2624         }
2625
2626         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2627         if (status == 0)
2628                 nfs_setattr_update_inode(inode, sattr);
2629         return status;
2630 }
2631
2632 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2633                 const struct qstr *name, struct nfs_fh *fhandle,
2634                 struct nfs_fattr *fattr)
2635 {
2636         struct nfs_server *server = NFS_SERVER(dir);
2637         int                    status;
2638         struct nfs4_lookup_arg args = {
2639                 .bitmask = server->attr_bitmask,
2640                 .dir_fh = NFS_FH(dir),
2641                 .name = name,
2642         };
2643         struct nfs4_lookup_res res = {
2644                 .server = server,
2645                 .fattr = fattr,
2646                 .fh = fhandle,
2647         };
2648         struct rpc_message msg = {
2649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2650                 .rpc_argp = &args,
2651                 .rpc_resp = &res,
2652         };
2653
2654         nfs_fattr_init(fattr);
2655
2656         dprintk("NFS call  lookup %s\n", name->name);
2657         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2658         dprintk("NFS reply lookup: %d\n", status);
2659         return status;
2660 }
2661
2662 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2663 {
2664         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2665                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2666         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2667         fattr->nlink = 2;
2668 }
2669
2670 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2671                                    struct qstr *name, struct nfs_fh *fhandle,
2672                                    struct nfs_fattr *fattr)
2673 {
2674         struct nfs4_exception exception = { };
2675         struct rpc_clnt *client = *clnt;
2676         int err;
2677         do {
2678                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2679                 switch (err) {
2680                 case -NFS4ERR_BADNAME:
2681                         err = -ENOENT;
2682                         goto out;
2683                 case -NFS4ERR_MOVED:
2684                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2685                         goto out;
2686                 case -NFS4ERR_WRONGSEC:
2687                         err = -EPERM;
2688                         if (client != *clnt)
2689                                 goto out;
2690
2691                         client = nfs4_create_sec_client(client, dir, name);
2692                         if (IS_ERR(client))
2693                                 return PTR_ERR(client);
2694
2695                         exception.retry = 1;
2696                         break;
2697                 default:
2698                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2699                 }
2700         } while (exception.retry);
2701
2702 out:
2703         if (err == 0)
2704                 *clnt = client;
2705         else if (client != *clnt)
2706                 rpc_shutdown_client(client);
2707
2708         return err;
2709 }
2710
2711 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2712                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2713 {
2714         int status;
2715         struct rpc_clnt *client = NFS_CLIENT(dir);
2716
2717         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2718         if (client != NFS_CLIENT(dir)) {
2719                 rpc_shutdown_client(client);
2720                 nfs_fixup_secinfo_attributes(fattr);
2721         }
2722         return status;
2723 }
2724
2725 struct rpc_clnt *
2726 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2727                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2728 {
2729         int status;
2730         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2731
2732         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2733         if (status < 0) {
2734                 rpc_shutdown_client(client);
2735                 return ERR_PTR(status);
2736         }
2737         return client;
2738 }
2739
2740 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2741 {
2742         struct nfs_server *server = NFS_SERVER(inode);
2743         struct nfs4_accessargs args = {
2744                 .fh = NFS_FH(inode),
2745                 .bitmask = server->cache_consistency_bitmask,
2746         };
2747         struct nfs4_accessres res = {
2748                 .server = server,
2749         };
2750         struct rpc_message msg = {
2751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2752                 .rpc_argp = &args,
2753                 .rpc_resp = &res,
2754                 .rpc_cred = entry->cred,
2755         };
2756         int mode = entry->mask;
2757         int status;
2758
2759         /*
2760          * Determine which access bits we want to ask for...
2761          */
2762         if (mode & MAY_READ)
2763                 args.access |= NFS4_ACCESS_READ;
2764         if (S_ISDIR(inode->i_mode)) {
2765                 if (mode & MAY_WRITE)
2766                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2767                 if (mode & MAY_EXEC)
2768                         args.access |= NFS4_ACCESS_LOOKUP;
2769         } else {
2770                 if (mode & MAY_WRITE)
2771                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2772                 if (mode & MAY_EXEC)
2773                         args.access |= NFS4_ACCESS_EXECUTE;
2774         }
2775
2776         res.fattr = nfs_alloc_fattr();
2777         if (res.fattr == NULL)
2778                 return -ENOMEM;
2779
2780         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2781         if (!status) {
2782                 nfs_access_set_mask(entry, res.access);
2783                 nfs_refresh_inode(inode, res.fattr);
2784         }
2785         nfs_free_fattr(res.fattr);
2786         return status;
2787 }
2788
2789 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2790 {
2791         struct nfs4_exception exception = { };
2792         int err;
2793         do {
2794                 err = nfs4_handle_exception(NFS_SERVER(inode),
2795                                 _nfs4_proc_access(inode, entry),
2796                                 &exception);
2797         } while (exception.retry);
2798         return err;
2799 }
2800
2801 /*
2802  * TODO: For the time being, we don't try to get any attributes
2803  * along with any of the zero-copy operations READ, READDIR,
2804  * READLINK, WRITE.
2805  *
2806  * In the case of the first three, we want to put the GETATTR
2807  * after the read-type operation -- this is because it is hard
2808  * to predict the length of a GETATTR response in v4, and thus
2809  * align the READ data correctly.  This means that the GETATTR
2810  * may end up partially falling into the page cache, and we should
2811  * shift it into the 'tail' of the xdr_buf before processing.
2812  * To do this efficiently, we need to know the total length
2813  * of data received, which doesn't seem to be available outside
2814  * of the RPC layer.
2815  *
2816  * In the case of WRITE, we also want to put the GETATTR after
2817  * the operation -- in this case because we want to make sure
2818  * we get the post-operation mtime and size.
2819  *
2820  * Both of these changes to the XDR layer would in fact be quite
2821  * minor, but I decided to leave them for a subsequent patch.
2822  */
2823 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2824                 unsigned int pgbase, unsigned int pglen)
2825 {
2826         struct nfs4_readlink args = {
2827                 .fh       = NFS_FH(inode),
2828                 .pgbase   = pgbase,
2829                 .pglen    = pglen,
2830                 .pages    = &page,
2831         };
2832         struct nfs4_readlink_res res;
2833         struct rpc_message msg = {
2834                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2835                 .rpc_argp = &args,
2836                 .rpc_resp = &res,
2837         };
2838
2839         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2840 }
2841
2842 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2843                 unsigned int pgbase, unsigned int pglen)
2844 {
2845         struct nfs4_exception exception = { };
2846         int err;
2847         do {
2848                 err = nfs4_handle_exception(NFS_SERVER(inode),
2849                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2850                                 &exception);
2851         } while (exception.retry);
2852         return err;
2853 }
2854
2855 /*
2856  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2857  */
2858 static int
2859 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2860                  int flags)
2861 {
2862         struct nfs_open_context *ctx;
2863         struct nfs4_state *state;
2864         int status = 0;
2865
2866         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2867         if (IS_ERR(ctx))
2868                 return PTR_ERR(ctx);
2869
2870         sattr->ia_mode &= ~current_umask();
2871         state = nfs4_do_open(dir, dentry, ctx->mode,
2872                         flags, sattr, ctx->cred,
2873                         &ctx->mdsthreshold);
2874         d_drop(dentry);
2875         if (IS_ERR(state)) {
2876                 status = PTR_ERR(state);
2877                 goto out;
2878         }
2879         d_add(dentry, igrab(state->inode));
2880         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2881         ctx->state = state;
2882 out:
2883         put_nfs_open_context(ctx);
2884         return status;
2885 }
2886
2887 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2888 {
2889         struct nfs_server *server = NFS_SERVER(dir);
2890         struct nfs_removeargs args = {
2891                 .fh = NFS_FH(dir),
2892                 .name = *name,
2893         };
2894         struct nfs_removeres res = {
2895                 .server = server,
2896         };
2897         struct rpc_message msg = {
2898                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2899                 .rpc_argp = &args,
2900                 .rpc_resp = &res,
2901         };
2902         int status;
2903
2904         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2905         if (status == 0)
2906                 update_changeattr(dir, &res.cinfo);
2907         return status;
2908 }
2909
2910 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2911 {
2912         struct nfs4_exception exception = { };
2913         int err;
2914         do {
2915                 err = nfs4_handle_exception(NFS_SERVER(dir),
2916                                 _nfs4_proc_remove(dir, name),
2917                                 &exception);
2918         } while (exception.retry);
2919         return err;
2920 }
2921
2922 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2923 {
2924         struct nfs_server *server = NFS_SERVER(dir);
2925         struct nfs_removeargs *args = msg->rpc_argp;
2926         struct nfs_removeres *res = msg->rpc_resp;
2927
2928         res->server = server;
2929         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2930         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2931 }
2932
2933 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2934 {
2935         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2936                                 &data->args.seq_args,
2937                                 &data->res.seq_res,
2938                                 task))
2939                 return;
2940         rpc_call_start(task);
2941 }
2942
2943 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2944 {
2945         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2946
2947         if (!nfs4_sequence_done(task, &res->seq_res))
2948                 return 0;
2949         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2950                 return 0;
2951         update_changeattr(dir, &res->cinfo);
2952         return 1;
2953 }
2954
2955 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2956 {
2957         struct nfs_server *server = NFS_SERVER(dir);
2958         struct nfs_renameargs *arg = msg->rpc_argp;
2959         struct nfs_renameres *res = msg->rpc_resp;
2960
2961         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2962         res->server = server;
2963         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2964 }
2965
2966 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2967 {
2968         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2969                                 &data->args.seq_args,
2970                                 &data->res.seq_res,
2971                                 task))
2972                 return;
2973         rpc_call_start(task);
2974 }
2975
2976 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2977                                  struct inode *new_dir)
2978 {
2979         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2980
2981         if (!nfs4_sequence_done(task, &res->seq_res))
2982                 return 0;
2983         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2984                 return 0;
2985
2986         update_changeattr(old_dir, &res->old_cinfo);
2987         update_changeattr(new_dir, &res->new_cinfo);
2988         return 1;
2989 }
2990
2991 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2992                 struct inode *new_dir, struct qstr *new_name)
2993 {
2994         struct nfs_server *server = NFS_SERVER(old_dir);
2995         struct nfs_renameargs arg = {
2996                 .old_dir = NFS_FH(old_dir),
2997                 .new_dir = NFS_FH(new_dir),
2998                 .old_name = old_name,
2999                 .new_name = new_name,
3000         };
3001         struct nfs_renameres res = {
3002                 .server = server,
3003         };
3004         struct rpc_message msg = {
3005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3006                 .rpc_argp = &arg,
3007                 .rpc_resp = &res,
3008         };
3009         int status = -ENOMEM;
3010
3011         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3012         if (!status) {
3013                 update_changeattr(old_dir, &res.old_cinfo);
3014                 update_changeattr(new_dir, &res.new_cinfo);
3015         }
3016         return status;
3017 }
3018
3019 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3020                 struct inode *new_dir, struct qstr *new_name)
3021 {
3022         struct nfs4_exception exception = { };
3023         int err;
3024         do {
3025                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3026                                 _nfs4_proc_rename(old_dir, old_name,
3027                                         new_dir, new_name),
3028                                 &exception);
3029         } while (exception.retry);
3030         return err;
3031 }
3032
3033 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3034 {
3035         struct nfs_server *server = NFS_SERVER(inode);
3036         struct nfs4_link_arg arg = {
3037                 .fh     = NFS_FH(inode),
3038                 .dir_fh = NFS_FH(dir),
3039                 .name   = name,
3040                 .bitmask = server->attr_bitmask,
3041         };
3042         struct nfs4_link_res res = {
3043                 .server = server,
3044         };
3045         struct rpc_message msg = {
3046                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3047                 .rpc_argp = &arg,
3048                 .rpc_resp = &res,
3049         };
3050         int status = -ENOMEM;
3051
3052         res.fattr = nfs_alloc_fattr();
3053         if (res.fattr == NULL)
3054                 goto out;
3055
3056         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3057         if (!status) {
3058                 update_changeattr(dir, &res.cinfo);
3059                 nfs_post_op_update_inode(inode, res.fattr);
3060         }
3061 out:
3062         nfs_free_fattr(res.fattr);
3063         return status;
3064 }
3065
3066 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3067 {
3068         struct nfs4_exception exception = { };
3069         int err;
3070         do {
3071                 err = nfs4_handle_exception(NFS_SERVER(inode),
3072                                 _nfs4_proc_link(inode, dir, name),
3073                                 &exception);
3074         } while (exception.retry);
3075         return err;
3076 }
3077
3078 struct nfs4_createdata {
3079         struct rpc_message msg;
3080         struct nfs4_create_arg arg;
3081         struct nfs4_create_res res;
3082         struct nfs_fh fh;
3083         struct nfs_fattr fattr;
3084 };
3085
3086 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3087                 struct qstr *name, struct iattr *sattr, u32 ftype)
3088 {
3089         struct nfs4_createdata *data;
3090
3091         data = kzalloc(sizeof(*data), GFP_KERNEL);
3092         if (data != NULL) {
3093                 struct nfs_server *server = NFS_SERVER(dir);
3094
3095                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3096                 data->msg.rpc_argp = &data->arg;
3097                 data->msg.rpc_resp = &data->res;
3098                 data->arg.dir_fh = NFS_FH(dir);
3099                 data->arg.server = server;
3100                 data->arg.name = name;
3101                 data->arg.attrs = sattr;
3102                 data->arg.ftype = ftype;
3103                 data->arg.bitmask = server->attr_bitmask;
3104                 data->res.server = server;
3105                 data->res.fh = &data->fh;
3106                 data->res.fattr = &data->fattr;
3107                 nfs_fattr_init(data->res.fattr);
3108         }
3109         return data;
3110 }
3111
3112 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3113 {
3114         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3115                                     &data->arg.seq_args, &data->res.seq_res, 1);
3116         if (status == 0) {
3117                 update_changeattr(dir, &data->res.dir_cinfo);
3118                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3119         }
3120         return status;
3121 }
3122
3123 static void nfs4_free_createdata(struct nfs4_createdata *data)
3124 {
3125         kfree(data);
3126 }
3127
3128 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3129                 struct page *page, unsigned int len, struct iattr *sattr)
3130 {
3131         struct nfs4_createdata *data;
3132         int status = -ENAMETOOLONG;
3133
3134         if (len > NFS4_MAXPATHLEN)
3135                 goto out;
3136
3137         status = -ENOMEM;
3138         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3139         if (data == NULL)
3140                 goto out;
3141
3142         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3143         data->arg.u.symlink.pages = &page;
3144         data->arg.u.symlink.len = len;
3145
3146         status = nfs4_do_create(dir, dentry, data);
3147
3148         nfs4_free_createdata(data);
3149 out:
3150         return status;
3151 }
3152
3153 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3154                 struct page *page, unsigned int len, struct iattr *sattr)
3155 {
3156         struct nfs4_exception exception = { };
3157         int err;
3158         do {
3159                 err = nfs4_handle_exception(NFS_SERVER(dir),
3160                                 _nfs4_proc_symlink(dir, dentry, page,
3161                                                         len, sattr),
3162                                 &exception);
3163         } while (exception.retry);
3164         return err;
3165 }
3166
3167 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3168                 struct iattr *sattr)
3169 {
3170         struct nfs4_createdata *data;
3171         int status = -ENOMEM;
3172
3173         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3174         if (data == NULL)
3175                 goto out;
3176
3177         status = nfs4_do_create(dir, dentry, data);
3178
3179         nfs4_free_createdata(data);
3180 out:
3181         return status;
3182 }
3183
3184 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3185                 struct iattr *sattr)
3186 {
3187         struct nfs4_exception exception = { };
3188         int err;
3189
3190         sattr->ia_mode &= ~current_umask();
3191         do {
3192                 err = nfs4_handle_exception(NFS_SERVER(dir),
3193                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3194                                 &exception);
3195         } while (exception.retry);
3196         return err;
3197 }
3198
3199 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3200                 u64 cookie, struct page **pages, unsigned int count, int plus)
3201 {
3202         struct inode            *dir = dentry->d_inode;
3203         struct nfs4_readdir_arg args = {
3204                 .fh = NFS_FH(dir),
3205                 .pages = pages,
3206                 .pgbase = 0,
3207                 .count = count,
3208                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3209                 .plus = plus,
3210         };
3211         struct nfs4_readdir_res res;
3212         struct rpc_message msg = {
3213                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3214                 .rpc_argp = &args,
3215                 .rpc_resp = &res,
3216                 .rpc_cred = cred,
3217         };
3218         int                     status;
3219
3220         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3221                         dentry->d_parent->d_name.name,
3222                         dentry->d_name.name,
3223                         (unsigned long long)cookie);
3224         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3225         res.pgbase = args.pgbase;
3226         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3227         if (status >= 0) {
3228                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3229                 status += args.pgbase;
3230         }
3231
3232         nfs_invalidate_atime(dir);
3233
3234         dprintk("%s: returns %d\n", __func__, status);
3235         return status;
3236 }
3237
3238 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3239                 u64 cookie, struct page **pages, unsigned int count, int plus)
3240 {
3241         struct nfs4_exception exception = { };
3242         int err;
3243         do {
3244                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3245                                 _nfs4_proc_readdir(dentry, cred, cookie,
3246                                         pages, count, plus),
3247                                 &exception);
3248         } while (exception.retry);
3249         return err;
3250 }
3251
3252 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3253                 struct iattr *sattr, dev_t rdev)
3254 {
3255         struct nfs4_createdata *data;
3256         int mode = sattr->ia_mode;
3257         int status = -ENOMEM;
3258
3259         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3260         if (data == NULL)
3261                 goto out;
3262
3263         if (S_ISFIFO(mode))
3264                 data->arg.ftype = NF4FIFO;
3265         else if (S_ISBLK(mode)) {
3266                 data->arg.ftype = NF4BLK;
3267                 data->arg.u.device.specdata1 = MAJOR(rdev);
3268                 data->arg.u.device.specdata2 = MINOR(rdev);
3269         }
3270         else if (S_ISCHR(mode)) {
3271                 data->arg.ftype = NF4CHR;
3272                 data->arg.u.device.specdata1 = MAJOR(rdev);
3273                 data->arg.u.device.specdata2 = MINOR(rdev);
3274         } else if (!S_ISSOCK(mode)) {
3275                 status = -EINVAL;
3276                 goto out_free;
3277         }
3278
3279         status = nfs4_do_create(dir, dentry, data);
3280 out_free:
3281         nfs4_free_createdata(data);
3282 out:
3283         return status;
3284 }
3285
3286 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3287                 struct iattr *sattr, dev_t rdev)
3288 {
3289         struct nfs4_exception exception = { };
3290         int err;
3291
3292         sattr->ia_mode &= ~current_umask();
3293         do {
3294                 err = nfs4_handle_exception(NFS_SERVER(dir),
3295                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3296                                 &exception);
3297         } while (exception.retry);
3298         return err;
3299 }
3300
3301 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3302                  struct nfs_fsstat *fsstat)
3303 {
3304         struct nfs4_statfs_arg args = {
3305                 .fh = fhandle,
3306                 .bitmask = server->attr_bitmask,
3307         };
3308         struct nfs4_statfs_res res = {
3309                 .fsstat = fsstat,
3310         };
3311         struct rpc_message msg = {
3312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3313                 .rpc_argp = &args,
3314                 .rpc_resp = &res,
3315         };
3316
3317         nfs_fattr_init(fsstat->fattr);
3318         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3319 }
3320
3321 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3322 {
3323         struct nfs4_exception exception = { };
3324         int err;
3325         do {
3326                 err = nfs4_handle_exception(server,
3327                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3328                                 &exception);
3329         } while (exception.retry);
3330         return err;
3331 }
3332
3333 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3334                 struct nfs_fsinfo *fsinfo)
3335 {
3336         struct nfs4_fsinfo_arg args = {
3337                 .fh = fhandle,
3338                 .bitmask = server->attr_bitmask,
3339         };
3340         struct nfs4_fsinfo_res res = {
3341                 .fsinfo = fsinfo,
3342         };
3343         struct rpc_message msg = {
3344                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3345                 .rpc_argp = &args,
3346                 .rpc_resp = &res,
3347         };
3348
3349         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3350 }
3351
3352 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3353 {
3354         struct nfs4_exception exception = { };
3355         int err;
3356
3357         do {
3358                 err = nfs4_handle_exception(server,
3359                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3360                                 &exception);
3361         } while (exception.retry);
3362         return err;
3363 }
3364
3365 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3366 {
3367         int error;
3368
3369         nfs_fattr_init(fsinfo->fattr);
3370         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3371         if (error == 0) {
3372                 /* block layout checks this! */
3373                 server->pnfs_blksize = fsinfo->blksize;
3374                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3375         }
3376
3377         return error;
3378 }
3379
3380 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3381                 struct nfs_pathconf *pathconf)
3382 {
3383         struct nfs4_pathconf_arg args = {
3384                 .fh = fhandle,
3385                 .bitmask = server->attr_bitmask,
3386         };
3387         struct nfs4_pathconf_res res = {
3388                 .pathconf = pathconf,
3389         };
3390         struct rpc_message msg = {
3391                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3392                 .rpc_argp = &args,
3393                 .rpc_resp = &res,
3394         };
3395
3396         /* None of the pathconf attributes are mandatory to implement */
3397         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3398                 memset(pathconf, 0, sizeof(*pathconf));
3399                 return 0;
3400         }
3401
3402         nfs_fattr_init(pathconf->fattr);
3403         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3404 }
3405
3406 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3407                 struct nfs_pathconf *pathconf)
3408 {
3409         struct nfs4_exception exception = { };
3410         int err;
3411
3412         do {
3413                 err = nfs4_handle_exception(server,
3414                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3415                                 &exception);
3416         } while (exception.retry);
3417         return err;
3418 }
3419
3420 void __nfs4_read_done_cb(struct nfs_read_data *data)
3421 {
3422         nfs_invalidate_atime(data->header->inode);
3423 }
3424
3425 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3426 {
3427         struct nfs_server *server = NFS_SERVER(data->header->inode);
3428
3429         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3430                 rpc_restart_call_prepare(task);
3431                 return -EAGAIN;
3432         }
3433
3434         __nfs4_read_done_cb(data);
3435         if (task->tk_status > 0)
3436                 renew_lease(server, data->timestamp);
3437         return 0;
3438 }
3439
3440 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3441 {
3442
3443         dprintk("--> %s\n", __func__);
3444
3445         if (!nfs4_sequence_done(task, &data->res.seq_res))
3446                 return -EAGAIN;
3447
3448         return data->read_done_cb ? data->read_done_cb(task, data) :
3449                                     nfs4_read_done_cb(task, data);
3450 }
3451
3452 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3453 {
3454         data->timestamp   = jiffies;
3455         data->read_done_cb = nfs4_read_done_cb;
3456         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3457         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3458 }
3459
3460 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3461 {
3462         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3463                                 &data->args.seq_args,
3464                                 &data->res.seq_res,
3465                                 task))
3466                 return;
3467         rpc_call_start(task);
3468 }
3469
3470 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3471 {
3472         struct inode *inode = data->header->inode;
3473
3474         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3475                 rpc_restart_call_prepare(task);
3476                 return -EAGAIN;
3477         }
3478         if (task->tk_status >= 0) {
3479                 renew_lease(NFS_SERVER(inode), data->timestamp);
3480                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3481         }
3482         return 0;
3483 }
3484
3485 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3486 {
3487         if (!nfs4_sequence_done(task, &data->res.seq_res))
3488                 return -EAGAIN;
3489         return data->write_done_cb ? data->write_done_cb(task, data) :
3490                 nfs4_write_done_cb(task, data);
3491 }
3492
3493 static
3494 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3495 {
3496         const struct nfs_pgio_header *hdr = data->header;
3497
3498         /* Don't request attributes for pNFS or O_DIRECT writes */
3499         if (data->ds_clp != NULL || hdr->dreq != NULL)
3500                 return false;
3501         /* Otherwise, request attributes if and only if we don't hold
3502          * a delegation
3503          */
3504         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3505 }
3506
3507 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3508 {
3509         struct nfs_server *server = NFS_SERVER(data->header->inode);
3510
3511         if (!nfs4_write_need_cache_consistency_data(data)) {
3512                 data->args.bitmask = NULL;
3513                 data->res.fattr = NULL;
3514         } else
3515                 data->args.bitmask = server->cache_consistency_bitmask;
3516
3517         if (!data->write_done_cb)
3518                 data->write_done_cb = nfs4_write_done_cb;
3519         data->res.server = server;
3520         data->timestamp   = jiffies;
3521
3522         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3523         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3524 }
3525
3526 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3527 {
3528         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3529                                 &data->args.seq_args,
3530                                 &data->res.seq_res,
3531                                 task))
3532                 return;
3533         rpc_call_start(task);
3534 }
3535
3536 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3537 {
3538         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3539                                 &data->args.seq_args,
3540                                 &data->res.seq_res,
3541                                 task))
3542                 return;
3543         rpc_call_start(task);
3544 }
3545
3546 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3547 {
3548         struct inode *inode = data->inode;
3549
3550         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3551                 rpc_restart_call_prepare(task);
3552                 return -EAGAIN;
3553         }
3554         return 0;
3555 }
3556
3557 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3558 {
3559         if (!nfs4_sequence_done(task, &data->res.seq_res))
3560                 return -EAGAIN;
3561         return data->commit_done_cb(task, data);
3562 }
3563
3564 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3565 {
3566         struct nfs_server *server = NFS_SERVER(data->inode);
3567
3568         if (data->commit_done_cb == NULL)
3569                 data->commit_done_cb = nfs4_commit_done_cb;
3570         data->res.server = server;
3571         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3572         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3573 }
3574
3575 struct nfs4_renewdata {
3576         struct nfs_client       *client;
3577         unsigned long           timestamp;
3578 };
3579
3580 /*
3581  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3582  * standalone procedure for queueing an asynchronous RENEW.
3583  */
3584 static void nfs4_renew_release(void *calldata)
3585 {
3586         struct nfs4_renewdata *data = calldata;
3587         struct nfs_client *clp = data->client;
3588
3589         if (atomic_read(&clp->cl_count) > 1)
3590                 nfs4_schedule_state_renewal(clp);
3591         nfs_put_client(clp);
3592         kfree(data);
3593 }
3594
3595 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3596 {
3597         struct nfs4_renewdata *data = calldata;
3598         struct nfs_client *clp = data->client;
3599         unsigned long timestamp = data->timestamp;
3600
3601         if (task->tk_status < 0) {
3602                 /* Unless we're shutting down, schedule state recovery! */
3603                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3604                         return;
3605                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3606                         nfs4_schedule_lease_recovery(clp);
3607                         return;
3608                 }
3609                 nfs4_schedule_path_down_recovery(clp);
3610         }
3611         do_renew_lease(clp, timestamp);
3612 }
3613
3614 static const struct rpc_call_ops nfs4_renew_ops = {
3615         .rpc_call_done = nfs4_renew_done,
3616         .rpc_release = nfs4_renew_release,
3617 };
3618
3619 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3620 {
3621         struct rpc_message msg = {
3622                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3623                 .rpc_argp       = clp,
3624                 .rpc_cred       = cred,
3625         };
3626         struct nfs4_renewdata *data;
3627
3628         if (renew_flags == 0)
3629                 return 0;
3630         if (!atomic_inc_not_zero(&clp->cl_count))
3631                 return -EIO;
3632         data = kmalloc(sizeof(*data), GFP_NOFS);
3633         if (data == NULL)
3634                 return -ENOMEM;
3635         data->client = clp;
3636         data->timestamp = jiffies;
3637         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3638                         &nfs4_renew_ops, data);
3639 }
3640
3641 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3642 {
3643         struct rpc_message msg = {
3644                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3645                 .rpc_argp       = clp,
3646                 .rpc_cred       = cred,
3647         };
3648         unsigned long now = jiffies;
3649         int status;
3650
3651         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3652         if (status < 0)
3653                 return status;
3654         do_renew_lease(clp, now);
3655         return 0;
3656 }
3657
3658 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3659 {
3660         return (server->caps & NFS_CAP_ACLS)
3661                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3662                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3663 }
3664
3665 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3666  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3667  * the stack.
3668  */
3669 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3670
3671 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3672                 struct page **pages, unsigned int *pgbase)
3673 {
3674         struct page *newpage, **spages;
3675         int rc = 0;
3676         size_t len;
3677         spages = pages;
3678
3679         do {
3680                 len = min_t(size_t, PAGE_SIZE, buflen);
3681                 newpage = alloc_page(GFP_KERNEL);
3682
3683                 if (newpage == NULL)
3684                         goto unwind;
3685                 memcpy(page_address(newpage), buf, len);
3686                 buf += len;
3687                 buflen -= len;
3688                 *pages++ = newpage;
3689                 rc++;
3690         } while (buflen != 0);
3691
3692         return rc;
3693
3694 unwind:
3695         for(; rc > 0; rc--)
3696                 __free_page(spages[rc-1]);
3697         return -ENOMEM;
3698 }
3699
3700 struct nfs4_cached_acl {
3701         int cached;
3702         size_t len;
3703         char data[0];
3704 };
3705
3706 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3707 {
3708         struct nfs_inode *nfsi = NFS_I(inode);
3709
3710         spin_lock(&inode->i_lock);
3711         kfree(nfsi->nfs4_acl);
3712         nfsi->nfs4_acl = acl;
3713         spin_unlock(&inode->i_lock);
3714 }
3715
3716 static void nfs4_zap_acl_attr(struct inode *inode)
3717 {
3718         nfs4_set_cached_acl(inode, NULL);
3719 }
3720
3721 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3722 {
3723         struct nfs_inode *nfsi = NFS_I(inode);
3724         struct nfs4_cached_acl *acl;
3725         int ret = -ENOENT;
3726
3727         spin_lock(&inode->i_lock);
3728         acl = nfsi->nfs4_acl;
3729         if (acl == NULL)
3730                 goto out;
3731         if (buf == NULL) /* user is just asking for length */
3732                 goto out_len;
3733         if (acl->cached == 0)
3734                 goto out;
3735         ret = -ERANGE; /* see getxattr(2) man page */
3736         if (acl->len > buflen)
3737                 goto out;
3738         memcpy(buf, acl->data, acl->len);
3739 out_len:
3740         ret = acl->len;
3741 out:
3742         spin_unlock(&inode->i_lock);
3743         return ret;
3744 }
3745
3746 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3747 {
3748         struct nfs4_cached_acl *acl;
3749         size_t buflen = sizeof(*acl) + acl_len;
3750
3751         if (buflen <= PAGE_SIZE) {
3752                 acl = kmalloc(buflen, GFP_KERNEL);
3753                 if (acl == NULL)
3754                         goto out;
3755                 acl->cached = 1;
3756                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3757         } else {
3758                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3759                 if (acl == NULL)
3760                         goto out;
3761                 acl->cached = 0;
3762         }
3763         acl->len = acl_len;
3764 out:
3765         nfs4_set_cached_acl(inode, acl);
3766 }
3767
3768 /*
3769  * The getxattr API returns the required buffer length when called with a
3770  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3771  * the required buf.  On a NULL buf, we send a page of data to the server
3772  * guessing that the ACL request can be serviced by a page. If so, we cache
3773  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3774  * the cache. If not so, we throw away the page, and cache the required
3775  * length. The next getxattr call will then produce another round trip to
3776  * the server, this time with the input buf of the required size.
3777  */
3778 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3779 {
3780         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3781         struct nfs_getaclargs args = {
3782                 .fh = NFS_FH(inode),
3783                 .acl_pages = pages,
3784                 .acl_len = buflen,
3785         };
3786         struct nfs_getaclres res = {
3787                 .acl_len = buflen,
3788         };
3789         struct rpc_message msg = {
3790                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3791                 .rpc_argp = &args,
3792                 .rpc_resp = &res,
3793         };
3794         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3795         int ret = -ENOMEM, i;
3796
3797         /* As long as we're doing a round trip to the server anyway,
3798          * let's be prepared for a page of acl data. */
3799         if (npages == 0)
3800                 npages = 1;
3801         if (npages > ARRAY_SIZE(pages))
3802                 return -ERANGE;
3803
3804         for (i = 0; i < npages; i++) {
3805                 pages[i] = alloc_page(GFP_KERNEL);
3806                 if (!pages[i])
3807                         goto out_free;
3808         }
3809
3810         /* for decoding across pages */
3811         res.acl_scratch = alloc_page(GFP_KERNEL);
3812         if (!res.acl_scratch)
3813                 goto out_free;
3814
3815         args.acl_len = npages * PAGE_SIZE;
3816         args.acl_pgbase = 0;
3817
3818         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3819                 __func__, buf, buflen, npages, args.acl_len);
3820         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3821                              &msg, &args.seq_args, &res.seq_res, 0);
3822         if (ret)
3823                 goto out_free;
3824
3825         /* Handle the case where the passed-in buffer is too short */
3826         if (res.acl_flags & NFS4_ACL_TRUNC) {
3827                 /* Did the user only issue a request for the acl length? */
3828                 if (buf == NULL)
3829                         goto out_ok;
3830                 ret = -ERANGE;
3831                 goto out_free;
3832         }
3833         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3834         if (buf)
3835                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3836 out_ok:
3837         ret = res.acl_len;
3838 out_free:
3839         for (i = 0; i < npages; i++)
3840                 if (pages[i])
3841                         __free_page(pages[i]);
3842         if (res.acl_scratch)
3843                 __free_page(res.acl_scratch);
3844         return ret;
3845 }
3846
3847 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3848 {
3849         struct nfs4_exception exception = { };
3850         ssize_t ret;
3851         do {
3852                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3853                 if (ret >= 0)
3854                         break;
3855                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3856         } while (exception.retry);
3857         return ret;
3858 }
3859
3860 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3861 {
3862         struct nfs_server *server = NFS_SERVER(inode);
3863         int ret;
3864
3865         if (!nfs4_server_supports_acls(server))
3866                 return -EOPNOTSUPP;
3867         ret = nfs_revalidate_inode(server, inode);
3868         if (ret < 0)
3869                 return ret;
3870         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3871                 nfs_zap_acl_cache(inode);
3872         ret = nfs4_read_cached_acl(inode, buf, buflen);
3873         if (ret != -ENOENT)
3874                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3875                  * but no cached acl data, just the acl length */
3876                 return ret;
3877         return nfs4_get_acl_uncached(inode, buf, buflen);
3878 }
3879
3880 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3881 {
3882         struct nfs_server *server = NFS_SERVER(inode);
3883         struct page *pages[NFS4ACL_MAXPAGES];
3884         struct nfs_setaclargs arg = {
3885                 .fh             = NFS_FH(inode),
3886                 .acl_pages      = pages,
3887                 .acl_len        = buflen,
3888         };
3889         struct nfs_setaclres res;
3890         struct rpc_message msg = {
3891                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3892                 .rpc_argp       = &arg,
3893                 .rpc_resp       = &res,
3894         };
3895         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3896         int ret, i;
3897
3898         if (!nfs4_server_supports_acls(server))
3899                 return -EOPNOTSUPP;
3900         if (npages > ARRAY_SIZE(pages))
3901                 return -ERANGE;
3902         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3903         if (i < 0)
3904                 return i;
3905         nfs4_inode_return_delegation(inode);
3906         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3907
3908         /*
3909          * Free each page after tx, so the only ref left is
3910          * held by the network stack
3911          */
3912         for (; i > 0; i--)
3913                 put_page(pages[i-1]);
3914
3915         /*
3916          * Acl update can result in inode attribute update.
3917          * so mark the attribute cache invalid.
3918          */
3919         spin_lock(&inode->i_lock);
3920         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3921         spin_unlock(&inode->i_lock);
3922         nfs_access_zap_cache(inode);
3923         nfs_zap_acl_cache(inode);
3924         return ret;
3925 }
3926
3927 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3928 {
3929         struct nfs4_exception exception = { };
3930         int err;
3931         do {
3932                 err = nfs4_handle_exception(NFS_SERVER(inode),
3933                                 __nfs4_proc_set_acl(inode, buf, buflen),
3934                                 &exception);
3935         } while (exception.retry);
3936         return err;
3937 }
3938
3939 static int
3940 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3941 {
3942         struct nfs_client *clp = server->nfs_client;
3943
3944         if (task->tk_status >= 0)
3945                 return 0;
3946         switch(task->tk_status) {
3947                 case -NFS4ERR_DELEG_REVOKED:
3948                 case -NFS4ERR_ADMIN_REVOKED:
3949                 case -NFS4ERR_BAD_STATEID:
3950                         if (state == NULL)
3951                                 break;
3952                         nfs_remove_bad_delegation(state->inode);
3953                 case -NFS4ERR_OPENMODE:
3954                         if (state == NULL)
3955                                 break;
3956                         nfs4_schedule_stateid_recovery(server, state);
3957                         goto wait_on_recovery;
3958                 case -NFS4ERR_EXPIRED:
3959                         if (state != NULL)
3960                                 nfs4_schedule_stateid_recovery(server, state);
3961                 case -NFS4ERR_STALE_STATEID:
3962                 case -NFS4ERR_STALE_CLIENTID:
3963                         nfs4_schedule_lease_recovery(clp);
3964                         goto wait_on_recovery;
3965 #if defined(CONFIG_NFS_V4_1)
3966                 case -NFS4ERR_BADSESSION:
3967                 case -NFS4ERR_BADSLOT:
3968                 case -NFS4ERR_BAD_HIGH_SLOT:
3969                 case -NFS4ERR_DEADSESSION:
3970                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3971                 case -NFS4ERR_SEQ_FALSE_RETRY:
3972                 case -NFS4ERR_SEQ_MISORDERED:
3973                         dprintk("%s ERROR %d, Reset session\n", __func__,
3974                                 task->tk_status);
3975                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3976                         task->tk_status = 0;
3977                         return -EAGAIN;
3978 #endif /* CONFIG_NFS_V4_1 */
3979                 case -NFS4ERR_DELAY:
3980                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3981                 case -NFS4ERR_GRACE:
3982                 case -EKEYEXPIRED:
3983                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3984                         task->tk_status = 0;
3985                         return -EAGAIN;
3986                 case -NFS4ERR_RETRY_UNCACHED_REP:
3987                 case -NFS4ERR_OLD_STATEID:
3988                         task->tk_status = 0;
3989                         return -EAGAIN;
3990         }
3991         task->tk_status = nfs4_map_errors(task->tk_status);
3992         return 0;
3993 wait_on_recovery:
3994         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3995         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3996                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3997         task->tk_status = 0;
3998         return -EAGAIN;
3999 }
4000
4001 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4002                                     nfs4_verifier *bootverf)
4003 {
4004         __be32 verf[2];
4005
4006         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4007                 /* An impossible timestamp guarantees this value
4008                  * will never match a generated boot time. */
4009                 verf[0] = 0;
4010                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4011         } else {
4012                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4013                 verf[0] = (__be32)nn->boot_time.tv_sec;
4014                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4015         }
4016         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4017 }
4018
4019 static unsigned int
4020 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4021                                    char *buf, size_t len)
4022 {
4023         unsigned int result;
4024
4025         rcu_read_lock();
4026         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4027                                 clp->cl_ipaddr,
4028                                 rpc_peeraddr2str(clp->cl_rpcclient,
4029                                                         RPC_DISPLAY_ADDR),
4030                                 rpc_peeraddr2str(clp->cl_rpcclient,
4031                                                         RPC_DISPLAY_PROTO));
4032         rcu_read_unlock();
4033         return result;
4034 }
4035
4036 static unsigned int
4037 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4038                                 char *buf, size_t len)
4039 {
4040         char *nodename = clp->cl_rpcclient->cl_nodename;
4041
4042         if (nfs4_client_id_uniquifier[0] != '\0')
4043                 nodename = nfs4_client_id_uniquifier;
4044         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4045                                 clp->rpc_ops->version, clp->cl_minorversion,
4046                                 nodename);
4047 }
4048
4049 /**
4050  * nfs4_proc_setclientid - Negotiate client ID
4051  * @clp: state data structure
4052  * @program: RPC program for NFSv4 callback service
4053  * @port: IP port number for NFS4 callback service
4054  * @cred: RPC credential to use for this call
4055  * @res: where to place the result
4056  *
4057  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4058  */
4059 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4060                 unsigned short port, struct rpc_cred *cred,
4061                 struct nfs4_setclientid_res *res)
4062 {
4063         nfs4_verifier sc_verifier;
4064         struct nfs4_setclientid setclientid = {
4065                 .sc_verifier = &sc_verifier,
4066                 .sc_prog = program,
4067                 .sc_cb_ident = clp->cl_cb_ident,
4068         };
4069         struct rpc_message msg = {
4070                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4071                 .rpc_argp = &setclientid,
4072                 .rpc_resp = res,
4073                 .rpc_cred = cred,
4074         };
4075         int status;
4076
4077         /* nfs_client_id4 */
4078         nfs4_init_boot_verifier(clp, &sc_verifier);
4079         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4080                 setclientid.sc_name_len =
4081                                 nfs4_init_uniform_client_string(clp,
4082                                                 setclientid.sc_name,
4083                                                 sizeof(setclientid.sc_name));
4084         else
4085                 setclientid.sc_name_len =
4086                                 nfs4_init_nonuniform_client_string(clp,
4087                                                 setclientid.sc_name,
4088                                                 sizeof(setclientid.sc_name));
4089         /* cb_client4 */
4090         rcu_read_lock();
4091         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4092                                 sizeof(setclientid.sc_netid),
4093                                 rpc_peeraddr2str(clp->cl_rpcclient,
4094                                                         RPC_DISPLAY_NETID));
4095         rcu_read_unlock();
4096         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4097                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4098                                 clp->cl_ipaddr, port >> 8, port & 255);
4099
4100         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4101                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4102                 setclientid.sc_name_len, setclientid.sc_name);
4103         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4104         dprintk("NFS reply setclientid: %d\n", status);
4105         return status;
4106 }
4107
4108 /**
4109  * nfs4_proc_setclientid_confirm - Confirm client ID
4110  * @clp: state data structure
4111  * @res: result of a previous SETCLIENTID
4112  * @cred: RPC credential to use for this call
4113  *
4114  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4115  */
4116 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4117                 struct nfs4_setclientid_res *arg,
4118                 struct rpc_cred *cred)
4119 {
4120         struct nfs_fsinfo fsinfo;
4121         struct rpc_message msg = {
4122                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4123                 .rpc_argp = arg,
4124                 .rpc_resp = &fsinfo,
4125                 .rpc_cred = cred,
4126         };
4127         unsigned long now;
4128         int status;
4129
4130         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4131                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4132                 clp->cl_clientid);
4133         now = jiffies;
4134         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4135         if (status == 0) {
4136                 spin_lock(&clp->cl_lock);
4137                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4138                 clp->cl_last_renewal = now;
4139                 spin_unlock(&clp->cl_lock);
4140         }
4141         dprintk("NFS reply setclientid_confirm: %d\n", status);
4142         return status;
4143 }
4144
4145 struct nfs4_delegreturndata {
4146         struct nfs4_delegreturnargs args;
4147         struct nfs4_delegreturnres res;
4148         struct nfs_fh fh;
4149         nfs4_stateid stateid;
4150         unsigned long timestamp;
4151         struct nfs_fattr fattr;
4152         int rpc_status;
4153 };
4154
4155 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4156 {
4157         struct nfs4_delegreturndata *data = calldata;
4158
4159         if (!nfs4_sequence_done(task, &data->res.seq_res))
4160                 return;
4161
4162         switch (task->tk_status) {
4163         case -NFS4ERR_STALE_STATEID:
4164         case -NFS4ERR_EXPIRED:
4165         case 0:
4166                 renew_lease(data->res.server, data->timestamp);
4167                 break;
4168         default:
4169                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4170                                 -EAGAIN) {
4171                         rpc_restart_call_prepare(task);
4172                         return;
4173                 }
4174         }
4175         data->rpc_status = task->tk_status;
4176 }
4177
4178 static void nfs4_delegreturn_release(void *calldata)
4179 {
4180         kfree(calldata);
4181 }
4182
4183 #if defined(CONFIG_NFS_V4_1)
4184 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4185 {
4186         struct nfs4_delegreturndata *d_data;
4187
4188         d_data = (struct nfs4_delegreturndata *)data;
4189
4190         if (nfs4_setup_sequence(d_data->res.server,
4191                                 &d_data->args.seq_args,
4192                                 &d_data->res.seq_res, task))
4193                 return;
4194         rpc_call_start(task);
4195 }
4196 #endif /* CONFIG_NFS_V4_1 */
4197
4198 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4199 #if defined(CONFIG_NFS_V4_1)
4200         .rpc_call_prepare = nfs4_delegreturn_prepare,
4201 #endif /* CONFIG_NFS_V4_1 */
4202         .rpc_call_done = nfs4_delegreturn_done,
4203         .rpc_release = nfs4_delegreturn_release,
4204 };
4205
4206 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4207 {
4208         struct nfs4_delegreturndata *data;
4209         struct nfs_server *server = NFS_SERVER(inode);
4210         struct rpc_task *task;
4211         struct rpc_message msg = {
4212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4213                 .rpc_cred = cred,
4214         };
4215         struct rpc_task_setup task_setup_data = {
4216                 .rpc_client = server->client,
4217                 .rpc_message = &msg,
4218                 .callback_ops = &nfs4_delegreturn_ops,
4219                 .flags = RPC_TASK_ASYNC,
4220         };
4221         int status = 0;
4222
4223         data = kzalloc(sizeof(*data), GFP_NOFS);
4224         if (data == NULL)
4225                 return -ENOMEM;
4226         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4227         data->args.fhandle = &data->fh;
4228         data->args.stateid = &data->stateid;
4229         data->args.bitmask = server->cache_consistency_bitmask;
4230         nfs_copy_fh(&data->fh, NFS_FH(inode));
4231         nfs4_stateid_copy(&data->stateid, stateid);
4232         data->res.fattr = &data->fattr;
4233         data->res.server = server;
4234         nfs_fattr_init(data->res.fattr);
4235         data->timestamp = jiffies;
4236         data->rpc_status = 0;
4237
4238         task_setup_data.callback_data = data;
4239         msg.rpc_argp = &data->args;
4240         msg.rpc_resp = &data->res;
4241         task = rpc_run_task(&task_setup_data);
4242         if (IS_ERR(task))
4243                 return PTR_ERR(task);
4244         if (!issync)
4245                 goto out;
4246         status = nfs4_wait_for_completion_rpc_task(task);
4247         if (status != 0)
4248                 goto out;
4249         status = data->rpc_status;
4250         if (status == 0)
4251                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4252         else
4253                 nfs_refresh_inode(inode, &data->fattr);
4254 out:
4255         rpc_put_task(task);
4256         return status;
4257 }
4258
4259 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4260 {
4261         struct nfs_server *server = NFS_SERVER(inode);
4262         struct nfs4_exception exception = { };
4263         int err;
4264         do {
4265                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4266                 switch (err) {
4267                         case -NFS4ERR_STALE_STATEID:
4268                         case -NFS4ERR_EXPIRED:
4269                         case 0:
4270                                 return 0;
4271                 }
4272                 err = nfs4_handle_exception(server, err, &exception);
4273         } while (exception.retry);
4274         return err;
4275 }
4276
4277 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4278 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4279
4280 /*
4281  * sleep, with exponential backoff, and retry the LOCK operation.
4282  */
4283 static unsigned long
4284 nfs4_set_lock_task_retry(unsigned long timeout)
4285 {
4286         freezable_schedule_timeout_killable(timeout);
4287         timeout <<= 1;
4288         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4289                 return NFS4_LOCK_MAXTIMEOUT;
4290         return timeout;
4291 }
4292
4293 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4294 {
4295         struct inode *inode = state->inode;
4296         struct nfs_server *server = NFS_SERVER(inode);
4297         struct nfs_client *clp = server->nfs_client;
4298         struct nfs_lockt_args arg = {
4299                 .fh = NFS_FH(inode),
4300                 .fl = request,
4301         };
4302         struct nfs_lockt_res res = {
4303                 .denied = request,
4304         };
4305         struct rpc_message msg = {
4306                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4307                 .rpc_argp       = &arg,
4308                 .rpc_resp       = &res,
4309                 .rpc_cred       = state->owner->so_cred,
4310         };
4311         struct nfs4_lock_state *lsp;
4312         int status;
4313
4314         arg.lock_owner.clientid = clp->cl_clientid;
4315         status = nfs4_set_lock_state(state, request);
4316         if (status != 0)
4317                 goto out;
4318         lsp = request->fl_u.nfs4_fl.owner;
4319         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4320         arg.lock_owner.s_dev = server->s_dev;
4321         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4322         switch (status) {
4323                 case 0:
4324                         request->fl_type = F_UNLCK;
4325                         break;
4326                 case -NFS4ERR_DENIED:
4327                         status = 0;
4328         }
4329         request->fl_ops->fl_release_private(request);
4330 out:
4331         return status;
4332 }
4333
4334 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4335 {
4336         struct nfs4_exception exception = { };
4337         int err;
4338
4339         do {
4340                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4341                                 _nfs4_proc_getlk(state, cmd, request),
4342                                 &exception);
4343         } while (exception.retry);
4344         return err;
4345 }
4346
4347 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4348 {
4349         int res = 0;
4350         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4351                 case FL_POSIX:
4352                         res = posix_lock_file_wait(file, fl);
4353                         break;
4354                 case FL_FLOCK:
4355                         res = flock_lock_file_wait(file, fl);
4356                         break;
4357                 default:
4358                         BUG();
4359         }
4360         return res;
4361 }
4362
4363 struct nfs4_unlockdata {
4364         struct nfs_locku_args arg;
4365         struct nfs_locku_res res;
4366         struct nfs4_lock_state *lsp;
4367         struct nfs_open_context *ctx;
4368         struct file_lock fl;
4369         const struct nfs_server *server;
4370         unsigned long timestamp;
4371 };
4372
4373 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4374                 struct nfs_open_context *ctx,
4375                 struct nfs4_lock_state *lsp,
4376                 struct nfs_seqid *seqid)
4377 {
4378         struct nfs4_unlockdata *p;
4379         struct inode *inode = lsp->ls_state->inode;
4380
4381         p = kzalloc(sizeof(*p), GFP_NOFS);
4382         if (p == NULL)
4383                 return NULL;
4384         p->arg.fh = NFS_FH(inode);
4385         p->arg.fl = &p->fl;
4386         p->arg.seqid = seqid;
4387         p->res.seqid = seqid;
4388         p->arg.stateid = &lsp->ls_stateid;
4389         p->lsp = lsp;
4390         atomic_inc(&lsp->ls_count);
4391         /* Ensure we don't close file until we're done freeing locks! */
4392         p->ctx = get_nfs_open_context(ctx);
4393         memcpy(&p->fl, fl, sizeof(p->fl));
4394         p->server = NFS_SERVER(inode);
4395         return p;
4396 }
4397
4398 static void nfs4_locku_release_calldata(void *data)
4399 {
4400         struct nfs4_unlockdata *calldata = data;
4401         nfs_free_seqid(calldata->arg.seqid);
4402         nfs4_put_lock_state(calldata->lsp);
4403         put_nfs_open_context(calldata->ctx);
4404         kfree(calldata);
4405 }
4406
4407 static void nfs4_locku_done(struct rpc_task *task, void *data)
4408 {
4409         struct nfs4_unlockdata *calldata = data;
4410
4411         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4412                 return;
4413         switch (task->tk_status) {
4414                 case 0:
4415                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4416                                         &calldata->res.stateid);
4417                         renew_lease(calldata->server, calldata->timestamp);
4418                         break;
4419                 case -NFS4ERR_BAD_STATEID:
4420                 case -NFS4ERR_OLD_STATEID:
4421                 case -NFS4ERR_STALE_STATEID:
4422                 case -NFS4ERR_EXPIRED:
4423                         break;
4424                 default:
4425                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4426                                 rpc_restart_call_prepare(task);
4427         }
4428         nfs_release_seqid(calldata->arg.seqid);
4429 }
4430
4431 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4432 {
4433         struct nfs4_unlockdata *calldata = data;
4434
4435         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4436                 return;
4437         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4438                 /* Note: exit _without_ running nfs4_locku_done */
4439                 task->tk_action = NULL;
4440                 return;
4441         }
4442         calldata->timestamp = jiffies;
4443         if (nfs4_setup_sequence(calldata->server,
4444                                 &calldata->arg.seq_args,
4445                                 &calldata->res.seq_res,
4446                                 task) != 0)
4447                 nfs_release_seqid(calldata->arg.seqid);
4448         else
4449                 rpc_call_start(task);
4450 }
4451
4452 static const struct rpc_call_ops nfs4_locku_ops = {
4453         .rpc_call_prepare = nfs4_locku_prepare,
4454         .rpc_call_done = nfs4_locku_done,
4455         .rpc_release = nfs4_locku_release_calldata,
4456 };
4457
4458 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4459                 struct nfs_open_context *ctx,
4460                 struct nfs4_lock_state *lsp,
4461                 struct nfs_seqid *seqid)
4462 {
4463         struct nfs4_unlockdata *data;
4464         struct rpc_message msg = {
4465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4466                 .rpc_cred = ctx->cred,
4467         };
4468         struct rpc_task_setup task_setup_data = {
4469                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4470                 .rpc_message = &msg,
4471                 .callback_ops = &nfs4_locku_ops,
4472                 .workqueue = nfsiod_workqueue,
4473                 .flags = RPC_TASK_ASYNC,
4474         };
4475
4476         /* Ensure this is an unlock - when canceling a lock, the
4477          * canceled lock is passed in, and it won't be an unlock.
4478          */
4479         fl->fl_type = F_UNLCK;
4480
4481         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4482         if (data == NULL) {
4483                 nfs_free_seqid(seqid);
4484                 return ERR_PTR(-ENOMEM);
4485         }
4486
4487         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4488         msg.rpc_argp = &data->arg;
4489         msg.rpc_resp = &data->res;
4490         task_setup_data.callback_data = data;
4491         return rpc_run_task(&task_setup_data);
4492 }
4493
4494 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4495 {
4496         struct nfs_inode *nfsi = NFS_I(state->inode);
4497         struct nfs_seqid *seqid;
4498         struct nfs4_lock_state *lsp;
4499         struct rpc_task *task;
4500         int status = 0;
4501         unsigned char fl_flags = request->fl_flags;
4502
4503         status = nfs4_set_lock_state(state, request);
4504         /* Unlock _before_ we do the RPC call */
4505         request->fl_flags |= FL_EXISTS;
4506         down_read(&nfsi->rwsem);
4507         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4508                 up_read(&nfsi->rwsem);
4509                 goto out;
4510         }
4511         up_read(&nfsi->rwsem);
4512         if (status != 0)
4513                 goto out;
4514         /* Is this a delegated lock? */
4515         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4516                 goto out;
4517         lsp = request->fl_u.nfs4_fl.owner;
4518         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4519         status = -ENOMEM;
4520         if (seqid == NULL)
4521                 goto out;
4522         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4523         status = PTR_ERR(task);
4524         if (IS_ERR(task))
4525                 goto out;
4526         status = nfs4_wait_for_completion_rpc_task(task);
4527         rpc_put_task(task);
4528 out:
4529         request->fl_flags = fl_flags;
4530         return status;
4531 }
4532
4533 struct nfs4_lockdata {
4534         struct nfs_lock_args arg;
4535         struct nfs_lock_res res;
4536         struct nfs4_lock_state *lsp;
4537         struct nfs_open_context *ctx;
4538         struct file_lock fl;
4539         unsigned long timestamp;
4540         int rpc_status;
4541         int cancelled;
4542         struct nfs_server *server;
4543 };
4544
4545 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4546                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4547                 gfp_t gfp_mask)
4548 {
4549         struct nfs4_lockdata *p;
4550         struct inode *inode = lsp->ls_state->inode;
4551         struct nfs_server *server = NFS_SERVER(inode);
4552
4553         p = kzalloc(sizeof(*p), gfp_mask);
4554         if (p == NULL)
4555                 return NULL;
4556
4557         p->arg.fh = NFS_FH(inode);
4558         p->arg.fl = &p->fl;
4559         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4560         if (p->arg.open_seqid == NULL)
4561                 goto out_free;
4562         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4563         if (p->arg.lock_seqid == NULL)
4564                 goto out_free_seqid;
4565         p->arg.lock_stateid = &lsp->ls_stateid;
4566         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4567         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4568         p->arg.lock_owner.s_dev = server->s_dev;
4569         p->res.lock_seqid = p->arg.lock_seqid;
4570         p->lsp = lsp;
4571         p->server = server;
4572         atomic_inc(&lsp->ls_count);
4573         p->ctx = get_nfs_open_context(ctx);
4574         memcpy(&p->fl, fl, sizeof(p->fl));
4575         return p;
4576 out_free_seqid:
4577         nfs_free_seqid(p->arg.open_seqid);
4578 out_free:
4579         kfree(p);
4580         return NULL;
4581 }
4582
4583 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4584 {
4585         struct nfs4_lockdata *data = calldata;
4586         struct nfs4_state *state = data->lsp->ls_state;
4587
4588         dprintk("%s: begin!\n", __func__);
4589         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4590                 return;
4591         /* Do we need to do an open_to_lock_owner? */
4592         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4593                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4594                         goto out_release_lock_seqid;
4595                 data->arg.open_stateid = &state->stateid;
4596                 data->arg.new_lock_owner = 1;
4597                 data->res.open_seqid = data->arg.open_seqid;
4598         } else
4599                 data->arg.new_lock_owner = 0;
4600         data->timestamp = jiffies;
4601         if (nfs4_setup_sequence(data->server,
4602                                 &data->arg.seq_args,
4603                                 &data->res.seq_res,
4604                                 task) == 0) {
4605                 rpc_call_start(task);
4606                 return;
4607         }
4608         nfs_release_seqid(data->arg.open_seqid);
4609 out_release_lock_seqid:
4610         nfs_release_seqid(data->arg.lock_seqid);
4611         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4612 }
4613
4614 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4615 {
4616         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4617         nfs4_lock_prepare(task, calldata);
4618 }
4619
4620 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4621 {
4622         struct nfs4_lockdata *data = calldata;
4623
4624         dprintk("%s: begin!\n", __func__);
4625
4626         if (!nfs4_sequence_done(task, &data->res.seq_res))
4627                 return;
4628
4629         data->rpc_status = task->tk_status;
4630         if (data->arg.new_lock_owner != 0) {
4631                 if (data->rpc_status == 0)
4632                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4633                 else
4634                         goto out;
4635         }
4636         if (data->rpc_status == 0) {
4637                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4638                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4639                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4640         }
4641 out:
4642         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4643 }
4644
4645 static void nfs4_lock_release(void *calldata)
4646 {
4647         struct nfs4_lockdata *data = calldata;
4648
4649         dprintk("%s: begin!\n", __func__);
4650         nfs_free_seqid(data->arg.open_seqid);
4651         if (data->cancelled != 0) {
4652                 struct rpc_task *task;
4653                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4654                                 data->arg.lock_seqid);
4655                 if (!IS_ERR(task))
4656                         rpc_put_task_async(task);
4657                 dprintk("%s: cancelling lock!\n", __func__);
4658         } else
4659                 nfs_free_seqid(data->arg.lock_seqid);
4660         nfs4_put_lock_state(data->lsp);
4661         put_nfs_open_context(data->ctx);
4662         kfree(data);
4663         dprintk("%s: done!\n", __func__);
4664 }
4665
4666 static const struct rpc_call_ops nfs4_lock_ops = {
4667         .rpc_call_prepare = nfs4_lock_prepare,
4668         .rpc_call_done = nfs4_lock_done,
4669         .rpc_release = nfs4_lock_release,
4670 };
4671
4672 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4673         .rpc_call_prepare = nfs4_recover_lock_prepare,
4674         .rpc_call_done = nfs4_lock_done,
4675         .rpc_release = nfs4_lock_release,
4676 };
4677
4678 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4679 {
4680         switch (error) {
4681         case -NFS4ERR_ADMIN_REVOKED:
4682         case -NFS4ERR_BAD_STATEID:
4683                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4684                 if (new_lock_owner != 0 ||
4685                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4686                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4687                 break;
4688         case -NFS4ERR_STALE_STATEID:
4689                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4690         case -NFS4ERR_EXPIRED:
4691                 nfs4_schedule_lease_recovery(server->nfs_client);
4692         };
4693 }
4694
4695 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4696 {
4697         struct nfs4_lockdata *data;
4698         struct rpc_task *task;
4699         struct rpc_message msg = {
4700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4701                 .rpc_cred = state->owner->so_cred,
4702         };
4703         struct rpc_task_setup task_setup_data = {
4704                 .rpc_client = NFS_CLIENT(state->inode),
4705                 .rpc_message = &msg,
4706                 .callback_ops = &nfs4_lock_ops,
4707                 .workqueue = nfsiod_workqueue,
4708                 .flags = RPC_TASK_ASYNC,
4709         };
4710         int ret;
4711
4712         dprintk("%s: begin!\n", __func__);
4713         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4714                         fl->fl_u.nfs4_fl.owner,
4715                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4716         if (data == NULL)
4717                 return -ENOMEM;
4718         if (IS_SETLKW(cmd))
4719                 data->arg.block = 1;
4720         if (recovery_type > NFS_LOCK_NEW) {
4721                 if (recovery_type == NFS_LOCK_RECLAIM)
4722                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4723                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4724         }
4725         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4726         msg.rpc_argp = &data->arg;
4727         msg.rpc_resp = &data->res;
4728         task_setup_data.callback_data = data;
4729         task = rpc_run_task(&task_setup_data);
4730         if (IS_ERR(task))
4731                 return PTR_ERR(task);
4732         ret = nfs4_wait_for_completion_rpc_task(task);
4733         if (ret == 0) {
4734                 ret = data->rpc_status;
4735                 if (ret)
4736                         nfs4_handle_setlk_error(data->server, data->lsp,
4737                                         data->arg.new_lock_owner, ret);
4738         } else
4739                 data->cancelled = 1;
4740         rpc_put_task(task);
4741         dprintk("%s: done, ret = %d!\n", __func__, ret);
4742         return ret;
4743 }
4744
4745 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4746 {
4747         struct nfs_server *server = NFS_SERVER(state->inode);
4748         struct nfs4_exception exception = {
4749                 .inode = state->inode,
4750         };
4751         int err;
4752
4753         do {
4754                 /* Cache the lock if possible... */
4755                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4756                         return 0;
4757                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4758                 if (err != -NFS4ERR_DELAY)
4759                         break;
4760                 nfs4_handle_exception(server, err, &exception);
4761         } while (exception.retry);
4762         return err;
4763 }
4764
4765 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4766 {
4767         struct nfs_server *server = NFS_SERVER(state->inode);
4768         struct nfs4_exception exception = {
4769                 .inode = state->inode,
4770         };
4771         int err;
4772
4773         err = nfs4_set_lock_state(state, request);
4774         if (err != 0)
4775                 return err;
4776         do {
4777                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4778                         return 0;
4779                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4780                 switch (err) {
4781                 default:
4782                         goto out;
4783                 case -NFS4ERR_GRACE:
4784                 case -NFS4ERR_DELAY:
4785                         nfs4_handle_exception(server, err, &exception);
4786                         err = 0;
4787                 }
4788         } while (exception.retry);
4789 out:
4790         return err;
4791 }
4792
4793 #if defined(CONFIG_NFS_V4_1)
4794 /**
4795  * nfs41_check_expired_locks - possibly free a lock stateid
4796  *
4797  * @state: NFSv4 state for an inode
4798  *
4799  * Returns NFS_OK if recovery for this stateid is now finished.
4800  * Otherwise a negative NFS4ERR value is returned.
4801  */
4802 static int nfs41_check_expired_locks(struct nfs4_state *state)
4803 {
4804         int status, ret = -NFS4ERR_BAD_STATEID;
4805         struct nfs4_lock_state *lsp;
4806         struct nfs_server *server = NFS_SERVER(state->inode);
4807
4808         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4809                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4810                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4811                         if (status != NFS_OK) {
4812                                 /* Free the stateid unless the server
4813                                  * informs us the stateid is unrecognized. */
4814                                 if (status != -NFS4ERR_BAD_STATEID)
4815                                         nfs41_free_stateid(server,
4816                                                         &lsp->ls_stateid);
4817                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4818                                 ret = status;
4819                         }
4820                 }
4821         };
4822
4823         return ret;
4824 }
4825
4826 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4827 {
4828         int status = NFS_OK;
4829
4830         if (test_bit(LK_STATE_IN_USE, &state->flags))
4831                 status = nfs41_check_expired_locks(state);
4832         if (status != NFS_OK)
4833                 status = nfs4_lock_expired(state, request);
4834         return status;
4835 }
4836 #endif
4837
4838 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4839 {
4840         struct nfs_inode *nfsi = NFS_I(state->inode);
4841         unsigned char fl_flags = request->fl_flags;
4842         int status = -ENOLCK;
4843
4844         if ((fl_flags & FL_POSIX) &&
4845                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4846                 goto out;
4847         /* Is this a delegated open? */
4848         status = nfs4_set_lock_state(state, request);
4849         if (status != 0)
4850                 goto out;
4851         request->fl_flags |= FL_ACCESS;
4852         status = do_vfs_lock(request->fl_file, request);
4853         if (status < 0)
4854                 goto out;
4855         down_read(&nfsi->rwsem);
4856         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4857                 /* Yes: cache locks! */
4858                 /* ...but avoid races with delegation recall... */
4859                 request->fl_flags = fl_flags & ~FL_SLEEP;
4860                 status = do_vfs_lock(request->fl_file, request);
4861                 goto out_unlock;
4862         }
4863         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4864         if (status != 0)
4865                 goto out_unlock;
4866         /* Note: we always want to sleep here! */
4867         request->fl_flags = fl_flags | FL_SLEEP;
4868         if (do_vfs_lock(request->fl_file, request) < 0)
4869                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4870                         "manager!\n", __func__);
4871 out_unlock:
4872         up_read(&nfsi->rwsem);
4873 out:
4874         request->fl_flags = fl_flags;
4875         return status;
4876 }
4877
4878 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4879 {
4880         struct nfs4_exception exception = {
4881                 .state = state,
4882                 .inode = state->inode,
4883         };
4884         int err;
4885
4886         do {
4887                 err = _nfs4_proc_setlk(state, cmd, request);
4888                 if (err == -NFS4ERR_DENIED)
4889                         err = -EAGAIN;
4890                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4891                                 err, &exception);
4892         } while (exception.retry);
4893         return err;
4894 }
4895
4896 static int
4897 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4898 {
4899         struct nfs_open_context *ctx;
4900         struct nfs4_state *state;
4901         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4902         int status;
4903
4904         /* verify open state */
4905         ctx = nfs_file_open_context(filp);
4906         state = ctx->state;
4907
4908         if (request->fl_start < 0 || request->fl_end < 0)
4909                 return -EINVAL;
4910
4911         if (IS_GETLK(cmd)) {
4912                 if (state != NULL)
4913                         return nfs4_proc_getlk(state, F_GETLK, request);
4914                 return 0;
4915         }
4916
4917         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4918                 return -EINVAL;
4919
4920         if (request->fl_type == F_UNLCK) {
4921                 if (state != NULL)
4922                         return nfs4_proc_unlck(state, cmd, request);
4923                 return 0;
4924         }
4925
4926         if (state == NULL)
4927                 return -ENOLCK;
4928         /*
4929          * Don't rely on the VFS having checked the file open mode,
4930          * since it won't do this for flock() locks.
4931          */
4932         switch (request->fl_type) {
4933         case F_RDLCK:
4934                 if (!(filp->f_mode & FMODE_READ))
4935                         return -EBADF;
4936                 break;
4937         case F_WRLCK:
4938                 if (!(filp->f_mode & FMODE_WRITE))
4939                         return -EBADF;
4940         }
4941
4942         do {
4943                 status = nfs4_proc_setlk(state, cmd, request);
4944                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4945                         break;
4946                 timeout = nfs4_set_lock_task_retry(timeout);
4947                 status = -ERESTARTSYS;
4948                 if (signalled())
4949                         break;
4950         } while(status < 0);
4951         return status;
4952 }
4953
4954 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4955 {
4956         struct nfs_server *server = NFS_SERVER(state->inode);
4957         struct nfs4_exception exception = { };
4958         int err;
4959
4960         err = nfs4_set_lock_state(state, fl);
4961         if (err != 0)
4962                 goto out;
4963         do {
4964                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4965                 switch (err) {
4966                         default:
4967                                 printk(KERN_ERR "NFS: %s: unhandled error "
4968                                         "%d.\n", __func__, err);
4969                         case 0:
4970                         case -ESTALE:
4971                                 goto out;
4972                         case -NFS4ERR_EXPIRED:
4973                                 nfs4_schedule_stateid_recovery(server, state);
4974                         case -NFS4ERR_STALE_CLIENTID:
4975                         case -NFS4ERR_STALE_STATEID:
4976                                 nfs4_schedule_lease_recovery(server->nfs_client);
4977                                 goto out;
4978                         case -NFS4ERR_BADSESSION:
4979                         case -NFS4ERR_BADSLOT:
4980                         case -NFS4ERR_BAD_HIGH_SLOT:
4981                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4982                         case -NFS4ERR_DEADSESSION:
4983                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4984                                 goto out;
4985                         case -ERESTARTSYS:
4986                                 /*
4987                                  * The show must go on: exit, but mark the
4988                                  * stateid as needing recovery.
4989                                  */
4990                         case -NFS4ERR_DELEG_REVOKED:
4991                         case -NFS4ERR_ADMIN_REVOKED:
4992                         case -NFS4ERR_BAD_STATEID:
4993                         case -NFS4ERR_OPENMODE:
4994                                 nfs4_schedule_stateid_recovery(server, state);
4995                                 err = 0;
4996                                 goto out;
4997                         case -EKEYEXPIRED:
4998                                 /*
4999                                  * User RPCSEC_GSS context has expired.
5000                                  * We cannot recover this stateid now, so
5001                                  * skip it and allow recovery thread to
5002                                  * proceed.
5003                                  */
5004                                 err = 0;
5005                                 goto out;
5006                         case -ENOMEM:
5007                         case -NFS4ERR_DENIED:
5008                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5009                                 err = 0;
5010                                 goto out;
5011                         case -NFS4ERR_DELAY:
5012                                 break;
5013                 }
5014                 err = nfs4_handle_exception(server, err, &exception);
5015         } while (exception.retry);
5016 out:
5017         return err;
5018 }
5019
5020 struct nfs_release_lockowner_data {
5021         struct nfs4_lock_state *lsp;
5022         struct nfs_server *server;
5023         struct nfs_release_lockowner_args args;
5024 };
5025
5026 static void nfs4_release_lockowner_release(void *calldata)
5027 {
5028         struct nfs_release_lockowner_data *data = calldata;
5029         nfs4_free_lock_state(data->server, data->lsp);
5030         kfree(calldata);
5031 }
5032
5033 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5034         .rpc_release = nfs4_release_lockowner_release,
5035 };
5036
5037 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5038 {
5039         struct nfs_server *server = lsp->ls_state->owner->so_server;
5040         struct nfs_release_lockowner_data *data;
5041         struct rpc_message msg = {
5042                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5043         };
5044
5045         if (server->nfs_client->cl_mvops->minor_version != 0)
5046                 return -EINVAL;
5047         data = kmalloc(sizeof(*data), GFP_NOFS);
5048         if (!data)
5049                 return -ENOMEM;
5050         data->lsp = lsp;
5051         data->server = server;
5052         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5053         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5054         data->args.lock_owner.s_dev = server->s_dev;
5055         msg.rpc_argp = &data->args;
5056         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5057         return 0;
5058 }
5059
5060 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5061
5062 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5063                                    const void *buf, size_t buflen,
5064                                    int flags, int type)
5065 {
5066         if (strcmp(key, "") != 0)
5067                 return -EINVAL;
5068
5069         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5070 }
5071
5072 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5073                                    void *buf, size_t buflen, int type)
5074 {
5075         if (strcmp(key, "") != 0)
5076                 return -EINVAL;
5077
5078         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5079 }
5080
5081 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5082                                        size_t list_len, const char *name,
5083                                        size_t name_len, int type)
5084 {
5085         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5086
5087         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5088                 return 0;
5089
5090         if (list && len <= list_len)
5091                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5092         return len;
5093 }
5094
5095 /*
5096  * nfs_fhget will use either the mounted_on_fileid or the fileid
5097  */
5098 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5099 {
5100         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5101                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5102               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5103               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5104                 return;
5105
5106         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5107                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5108         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5109         fattr->nlink = 2;
5110 }
5111
5112 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5113                                    const struct qstr *name,
5114                                    struct nfs4_fs_locations *fs_locations,
5115                                    struct page *page)
5116 {
5117         struct nfs_server *server = NFS_SERVER(dir);
5118         u32 bitmask[2] = {
5119                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5120         };
5121         struct nfs4_fs_locations_arg args = {
5122                 .dir_fh = NFS_FH(dir),
5123                 .name = name,
5124                 .page = page,
5125                 .bitmask = bitmask,
5126         };
5127         struct nfs4_fs_locations_res res = {
5128                 .fs_locations = fs_locations,
5129         };
5130         struct rpc_message msg = {
5131                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5132                 .rpc_argp = &args,
5133                 .rpc_resp = &res,
5134         };
5135         int status;
5136
5137         dprintk("%s: start\n", __func__);
5138
5139         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5140          * is not supported */
5141         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5142                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5143         else
5144                 bitmask[0] |= FATTR4_WORD0_FILEID;
5145
5146         nfs_fattr_init(&fs_locations->fattr);
5147         fs_locations->server = server;
5148         fs_locations->nlocations = 0;
5149         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5150         dprintk("%s: returned status = %d\n", __func__, status);
5151         return status;
5152 }
5153
5154 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5155                            const struct qstr *name,
5156                            struct nfs4_fs_locations *fs_locations,
5157                            struct page *page)
5158 {
5159         struct nfs4_exception exception = { };
5160         int err;
5161         do {
5162                 err = nfs4_handle_exception(NFS_SERVER(dir),
5163                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5164                                 &exception);
5165         } while (exception.retry);
5166         return err;
5167 }
5168
5169 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5170 {
5171         int status;
5172         struct nfs4_secinfo_arg args = {
5173                 .dir_fh = NFS_FH(dir),
5174                 .name   = name,
5175         };
5176         struct nfs4_secinfo_res res = {
5177                 .flavors     = flavors,
5178         };
5179         struct rpc_message msg = {
5180                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5181                 .rpc_argp = &args,
5182                 .rpc_resp = &res,
5183         };
5184
5185         dprintk("NFS call  secinfo %s\n", name->name);
5186         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5187         dprintk("NFS reply  secinfo: %d\n", status);
5188         return status;
5189 }
5190
5191 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5192                       struct nfs4_secinfo_flavors *flavors)
5193 {
5194         struct nfs4_exception exception = { };
5195         int err;
5196         do {
5197                 err = nfs4_handle_exception(NFS_SERVER(dir),
5198                                 _nfs4_proc_secinfo(dir, name, flavors),
5199                                 &exception);
5200         } while (exception.retry);
5201         return err;
5202 }
5203
5204 #ifdef CONFIG_NFS_V4_1
5205 /*
5206  * Check the exchange flags returned by the server for invalid flags, having
5207  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5208  * DS flags set.
5209  */
5210 static int nfs4_check_cl_exchange_flags(u32 flags)
5211 {
5212         if (flags & ~EXCHGID4_FLAG_MASK_R)
5213                 goto out_inval;
5214         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5215             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5216                 goto out_inval;
5217         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5218                 goto out_inval;
5219         return NFS_OK;
5220 out_inval:
5221         return -NFS4ERR_INVAL;
5222 }
5223
5224 static bool
5225 nfs41_same_server_scope(struct nfs41_server_scope *a,
5226                         struct nfs41_server_scope *b)
5227 {
5228         if (a->server_scope_sz == b->server_scope_sz &&
5229             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5230                 return true;
5231
5232         return false;
5233 }
5234
5235 /*
5236  * nfs4_proc_bind_conn_to_session()
5237  *
5238  * The 4.1 client currently uses the same TCP connection for the
5239  * fore and backchannel.
5240  */
5241 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5242 {
5243         int status;
5244         struct nfs41_bind_conn_to_session_res res;
5245         struct rpc_message msg = {
5246                 .rpc_proc =
5247                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5248                 .rpc_argp = clp,
5249                 .rpc_resp = &res,
5250                 .rpc_cred = cred,
5251         };
5252
5253         dprintk("--> %s\n", __func__);
5254
5255         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5256         if (unlikely(res.session == NULL)) {
5257                 status = -ENOMEM;
5258                 goto out;
5259         }
5260
5261         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5262         if (status == 0) {
5263                 if (memcmp(res.session->sess_id.data,
5264                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5265                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5266                         status = -EIO;
5267                         goto out_session;
5268                 }
5269                 if (res.dir != NFS4_CDFS4_BOTH) {
5270                         dprintk("NFS: %s: Unexpected direction from server\n",
5271                                 __func__);
5272                         status = -EIO;
5273                         goto out_session;
5274                 }
5275                 if (res.use_conn_in_rdma_mode) {
5276                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5277                                 __func__);
5278                         status = -EIO;
5279                         goto out_session;
5280                 }
5281         }
5282 out_session:
5283         kfree(res.session);
5284 out:
5285         dprintk("<-- %s status= %d\n", __func__, status);
5286         return status;
5287 }
5288
5289 /*
5290  * nfs4_proc_exchange_id()
5291  *
5292  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5293  *
5294  * Since the clientid has expired, all compounds using sessions
5295  * associated with the stale clientid will be returning
5296  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5297  * be in some phase of session reset.
5298  */
5299 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5300 {
5301         nfs4_verifier verifier;
5302         struct nfs41_exchange_id_args args = {
5303                 .verifier = &verifier,
5304                 .client = clp,
5305                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5306         };
5307         struct nfs41_exchange_id_res res = {
5308                 0
5309         };
5310         int status;
5311         struct rpc_message msg = {
5312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5313                 .rpc_argp = &args,
5314                 .rpc_resp = &res,
5315                 .rpc_cred = cred,
5316         };
5317
5318         nfs4_init_boot_verifier(clp, &verifier);
5319         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5320                                                         sizeof(args.id));
5321         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5322                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5323                 args.id_len, args.id);
5324
5325         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5326                                         GFP_NOFS);
5327         if (unlikely(res.server_owner == NULL)) {
5328                 status = -ENOMEM;
5329                 goto out;
5330         }
5331
5332         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5333                                         GFP_NOFS);
5334         if (unlikely(res.server_scope == NULL)) {
5335                 status = -ENOMEM;
5336                 goto out_server_owner;
5337         }
5338
5339         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5340         if (unlikely(res.impl_id == NULL)) {
5341                 status = -ENOMEM;
5342                 goto out_server_scope;
5343         }
5344
5345         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5346         if (status == 0)
5347                 status = nfs4_check_cl_exchange_flags(res.flags);
5348
5349         if (status == 0) {
5350                 clp->cl_clientid = res.clientid;
5351                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5352                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5353                         clp->cl_seqid = res.seqid;
5354
5355                 kfree(clp->cl_serverowner);
5356                 clp->cl_serverowner = res.server_owner;
5357                 res.server_owner = NULL;
5358
5359                 /* use the most recent implementation id */
5360                 kfree(clp->cl_implid);
5361                 clp->cl_implid = res.impl_id;
5362
5363                 if (clp->cl_serverscope != NULL &&
5364                     !nfs41_same_server_scope(clp->cl_serverscope,
5365                                              res.server_scope)) {
5366                         dprintk("%s: server_scope mismatch detected\n",
5367                                 __func__);
5368                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5369                         kfree(clp->cl_serverscope);
5370                         clp->cl_serverscope = NULL;
5371                 }
5372
5373                 if (clp->cl_serverscope == NULL) {
5374                         clp->cl_serverscope = res.server_scope;
5375                         goto out;
5376                 }
5377         } else
5378                 kfree(res.impl_id);
5379
5380 out_server_owner:
5381         kfree(res.server_owner);
5382 out_server_scope:
5383         kfree(res.server_scope);
5384 out:
5385         if (clp->cl_implid != NULL)
5386                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5387                         "domain: %s, name: %s, date: %llu,%u\n",
5388                         clp->cl_implid->domain, clp->cl_implid->name,
5389                         clp->cl_implid->date.seconds,
5390                         clp->cl_implid->date.nseconds);
5391         dprintk("NFS reply exchange_id: %d\n", status);
5392         return status;
5393 }
5394
5395 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5396                 struct rpc_cred *cred)
5397 {
5398         struct rpc_message msg = {
5399                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5400                 .rpc_argp = clp,
5401                 .rpc_cred = cred,
5402         };
5403         int status;
5404
5405         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5406         if (status)
5407                 dprintk("NFS: Got error %d from the server %s on "
5408                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5409         return status;
5410 }
5411
5412 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5413                 struct rpc_cred *cred)
5414 {
5415         unsigned int loop;
5416         int ret;
5417
5418         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5419                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5420                 switch (ret) {
5421                 case -NFS4ERR_DELAY:
5422                 case -NFS4ERR_CLIENTID_BUSY:
5423                         ssleep(1);
5424                         break;
5425                 default:
5426                         return ret;
5427                 }
5428         }
5429         return 0;
5430 }
5431
5432 int nfs4_destroy_clientid(struct nfs_client *clp)
5433 {
5434         struct rpc_cred *cred;
5435         int ret = 0;
5436
5437         if (clp->cl_mvops->minor_version < 1)
5438                 goto out;
5439         if (clp->cl_exchange_flags == 0)
5440                 goto out;
5441         if (clp->cl_preserve_clid)
5442                 goto out;
5443         cred = nfs4_get_exchange_id_cred(clp);
5444         ret = nfs4_proc_destroy_clientid(clp, cred);
5445         if (cred)
5446                 put_rpccred(cred);
5447         switch (ret) {
5448         case 0:
5449         case -NFS4ERR_STALE_CLIENTID:
5450                 clp->cl_exchange_flags = 0;
5451         }
5452 out:
5453         return ret;
5454 }
5455
5456 struct nfs4_get_lease_time_data {
5457         struct nfs4_get_lease_time_args *args;
5458         struct nfs4_get_lease_time_res *res;
5459         struct nfs_client *clp;
5460 };
5461
5462 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5463                                         void *calldata)
5464 {
5465         int ret;
5466         struct nfs4_get_lease_time_data *data =
5467                         (struct nfs4_get_lease_time_data *)calldata;
5468
5469         dprintk("--> %s\n", __func__);
5470         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5471         /* just setup sequence, do not trigger session recovery
5472            since we're invoked within one */
5473         ret = nfs41_setup_sequence(data->clp->cl_session,
5474                                    &data->args->la_seq_args,
5475                                    &data->res->lr_seq_res, task);
5476
5477         if (ret != -EAGAIN)
5478                 rpc_call_start(task);
5479         dprintk("<-- %s\n", __func__);
5480 }
5481
5482 /*
5483  * Called from nfs4_state_manager thread for session setup, so don't recover
5484  * from sequence operation or clientid errors.
5485  */
5486 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5487 {
5488         struct nfs4_get_lease_time_data *data =
5489                         (struct nfs4_get_lease_time_data *)calldata;
5490
5491         dprintk("--> %s\n", __func__);
5492         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5493                 return;
5494         switch (task->tk_status) {
5495         case -NFS4ERR_DELAY:
5496         case -NFS4ERR_GRACE:
5497                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5498                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5499                 task->tk_status = 0;
5500                 /* fall through */
5501         case -NFS4ERR_RETRY_UNCACHED_REP:
5502                 rpc_restart_call_prepare(task);
5503                 return;
5504         }
5505         dprintk("<-- %s\n", __func__);
5506 }
5507
5508 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5509         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5510         .rpc_call_done = nfs4_get_lease_time_done,
5511 };
5512
5513 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5514 {
5515         struct rpc_task *task;
5516         struct nfs4_get_lease_time_args args;
5517         struct nfs4_get_lease_time_res res = {
5518                 .lr_fsinfo = fsinfo,
5519         };
5520         struct nfs4_get_lease_time_data data = {
5521                 .args = &args,
5522                 .res = &res,
5523                 .clp = clp,
5524         };
5525         struct rpc_message msg = {
5526                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5527                 .rpc_argp = &args,
5528                 .rpc_resp = &res,
5529         };
5530         struct rpc_task_setup task_setup = {
5531                 .rpc_client = clp->cl_rpcclient,
5532                 .rpc_message = &msg,
5533                 .callback_ops = &nfs4_get_lease_time_ops,
5534                 .callback_data = &data,
5535                 .flags = RPC_TASK_TIMEOUT,
5536         };
5537         int status;
5538
5539         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5540         dprintk("--> %s\n", __func__);
5541         task = rpc_run_task(&task_setup);
5542
5543         if (IS_ERR(task))
5544                 status = PTR_ERR(task);
5545         else {
5546                 status = task->tk_status;
5547                 rpc_put_task(task);
5548         }
5549         dprintk("<-- %s return %d\n", __func__, status);
5550
5551         return status;
5552 }
5553
5554 /*
5555  * Initialize the values to be used by the client in CREATE_SESSION
5556  * If nfs4_init_session set the fore channel request and response sizes,
5557  * use them.
5558  *
5559  * Set the back channel max_resp_sz_cached to zero to force the client to
5560  * always set csa_cachethis to FALSE because the current implementation
5561  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5562  */
5563 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5564 {
5565         struct nfs4_session *session = args->client->cl_session;
5566         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5567                      mxresp_sz = session->fc_target_max_resp_sz;
5568
5569         if (mxrqst_sz == 0)
5570                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5571         if (mxresp_sz == 0)
5572                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5573         /* Fore channel attributes */
5574         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5575         args->fc_attrs.max_resp_sz = mxresp_sz;
5576         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5577         args->fc_attrs.max_reqs = max_session_slots;
5578
5579         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5580                 "max_ops=%u max_reqs=%u\n",
5581                 __func__,
5582                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5583                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5584
5585         /* Back channel attributes */
5586         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5587         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5588         args->bc_attrs.max_resp_sz_cached = 0;
5589         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5590         args->bc_attrs.max_reqs = 1;
5591
5592         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5593                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5594                 __func__,
5595                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5596                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5597                 args->bc_attrs.max_reqs);
5598 }
5599
5600 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5601 {
5602         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5603         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5604
5605         if (rcvd->max_resp_sz > sent->max_resp_sz)
5606                 return -EINVAL;
5607         /*
5608          * Our requested max_ops is the minimum we need; we're not
5609          * prepared to break up compounds into smaller pieces than that.
5610          * So, no point even trying to continue if the server won't
5611          * cooperate:
5612          */
5613         if (rcvd->max_ops < sent->max_ops)
5614                 return -EINVAL;
5615         if (rcvd->max_reqs == 0)
5616                 return -EINVAL;
5617         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5618                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5619         return 0;
5620 }
5621
5622 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5623 {
5624         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5625         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5626
5627         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5628                 return -EINVAL;
5629         if (rcvd->max_resp_sz < sent->max_resp_sz)
5630                 return -EINVAL;
5631         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5632                 return -EINVAL;
5633         /* These would render the backchannel useless: */
5634         if (rcvd->max_ops != sent->max_ops)
5635                 return -EINVAL;
5636         if (rcvd->max_reqs != sent->max_reqs)
5637                 return -EINVAL;
5638         return 0;
5639 }
5640
5641 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5642                                      struct nfs4_session *session)
5643 {
5644         int ret;
5645
5646         ret = nfs4_verify_fore_channel_attrs(args, session);
5647         if (ret)
5648                 return ret;
5649         return nfs4_verify_back_channel_attrs(args, session);
5650 }
5651
5652 static int _nfs4_proc_create_session(struct nfs_client *clp,
5653                 struct rpc_cred *cred)
5654 {
5655         struct nfs4_session *session = clp->cl_session;
5656         struct nfs41_create_session_args args = {
5657                 .client = clp,
5658                 .cb_program = NFS4_CALLBACK,
5659         };
5660         struct nfs41_create_session_res res = {
5661                 .client = clp,
5662         };
5663         struct rpc_message msg = {
5664                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5665                 .rpc_argp = &args,
5666                 .rpc_resp = &res,
5667                 .rpc_cred = cred,
5668         };
5669         int status;
5670
5671         nfs4_init_channel_attrs(&args);
5672         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5673
5674         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5675
5676         if (!status) {
5677                 /* Verify the session's negotiated channel_attrs values */
5678                 status = nfs4_verify_channel_attrs(&args, session);
5679                 /* Increment the clientid slot sequence id */
5680                 clp->cl_seqid++;
5681         }
5682
5683         return status;
5684 }
5685
5686 /*
5687  * Issues a CREATE_SESSION operation to the server.
5688  * It is the responsibility of the caller to verify the session is
5689  * expired before calling this routine.
5690  */
5691 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5692 {
5693         int status;
5694         unsigned *ptr;
5695         struct nfs4_session *session = clp->cl_session;
5696
5697         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5698
5699         status = _nfs4_proc_create_session(clp, cred);
5700         if (status)
5701                 goto out;
5702
5703         /* Init or reset the session slot tables */
5704         status = nfs4_setup_session_slot_tables(session);
5705         dprintk("slot table setup returned %d\n", status);
5706         if (status)
5707                 goto out;
5708
5709         ptr = (unsigned *)&session->sess_id.data[0];
5710         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5711                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5712 out:
5713         dprintk("<-- %s\n", __func__);
5714         return status;
5715 }
5716
5717 /*
5718  * Issue the over-the-wire RPC DESTROY_SESSION.
5719  * The caller must serialize access to this routine.
5720  */
5721 int nfs4_proc_destroy_session(struct nfs4_session *session,
5722                 struct rpc_cred *cred)
5723 {
5724         struct rpc_message msg = {
5725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5726                 .rpc_argp = session,
5727                 .rpc_cred = cred,
5728         };
5729         int status = 0;
5730
5731         dprintk("--> nfs4_proc_destroy_session\n");
5732
5733         /* session is still being setup */
5734         if (session->clp->cl_cons_state != NFS_CS_READY)
5735                 return status;
5736
5737         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5738
5739         if (status)
5740                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5741                         "Session has been destroyed regardless...\n", status);
5742
5743         dprintk("<-- nfs4_proc_destroy_session\n");
5744         return status;
5745 }
5746
5747 /*
5748  * Renew the cl_session lease.
5749  */
5750 struct nfs4_sequence_data {
5751         struct nfs_client *clp;
5752         struct nfs4_sequence_args args;
5753         struct nfs4_sequence_res res;
5754 };
5755
5756 static void nfs41_sequence_release(void *data)
5757 {
5758         struct nfs4_sequence_data *calldata = data;
5759         struct nfs_client *clp = calldata->clp;
5760
5761         if (atomic_read(&clp->cl_count) > 1)
5762                 nfs4_schedule_state_renewal(clp);
5763         nfs_put_client(clp);
5764         kfree(calldata);
5765 }
5766
5767 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5768 {
5769         switch(task->tk_status) {
5770         case -NFS4ERR_DELAY:
5771                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5772                 return -EAGAIN;
5773         default:
5774                 nfs4_schedule_lease_recovery(clp);
5775         }
5776         return 0;
5777 }
5778
5779 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5780 {
5781         struct nfs4_sequence_data *calldata = data;
5782         struct nfs_client *clp = calldata->clp;
5783
5784         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5785                 return;
5786
5787         if (task->tk_status < 0) {
5788                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5789                 if (atomic_read(&clp->cl_count) == 1)
5790                         goto out;
5791
5792                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5793                         rpc_restart_call_prepare(task);
5794                         return;
5795                 }
5796         }
5797         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5798 out:
5799         dprintk("<-- %s\n", __func__);
5800 }
5801
5802 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5803 {
5804         struct nfs4_sequence_data *calldata = data;
5805         struct nfs_client *clp = calldata->clp;
5806         struct nfs4_sequence_args *args;
5807         struct nfs4_sequence_res *res;
5808
5809         args = task->tk_msg.rpc_argp;
5810         res = task->tk_msg.rpc_resp;
5811
5812         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5813                 return;
5814         rpc_call_start(task);
5815 }
5816
5817 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
5818 {
5819         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5820         nfs41_sequence_prepare(task, data);
5821 }
5822
5823 static const struct rpc_call_ops nfs41_sequence_ops = {
5824         .rpc_call_done = nfs41_sequence_call_done,
5825         .rpc_call_prepare = nfs41_sequence_prepare,
5826         .rpc_release = nfs41_sequence_release,
5827 };
5828
5829 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
5830         .rpc_call_done = nfs41_sequence_call_done,
5831         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
5832         .rpc_release = nfs41_sequence_release,
5833 };
5834
5835 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
5836                                              const struct rpc_call_ops *seq_ops)
5837 {
5838         struct nfs4_sequence_data *calldata;
5839         struct rpc_message msg = {
5840                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5841                 .rpc_cred = cred,
5842         };
5843         struct rpc_task_setup task_setup_data = {
5844                 .rpc_client = clp->cl_rpcclient,
5845                 .rpc_message = &msg,
5846                 .callback_ops = seq_ops,
5847                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5848         };
5849
5850         if (!atomic_inc_not_zero(&clp->cl_count))
5851                 return ERR_PTR(-EIO);
5852         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5853         if (calldata == NULL) {
5854                 nfs_put_client(clp);
5855                 return ERR_PTR(-ENOMEM);
5856         }
5857         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5858         msg.rpc_argp = &calldata->args;
5859         msg.rpc_resp = &calldata->res;
5860         calldata->clp = clp;
5861         task_setup_data.callback_data = calldata;
5862
5863         return rpc_run_task(&task_setup_data);
5864 }
5865
5866 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5867 {
5868         struct rpc_task *task;
5869         int ret = 0;
5870
5871         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5872                 return 0;
5873         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
5874         if (IS_ERR(task))
5875                 ret = PTR_ERR(task);
5876         else
5877                 rpc_put_task_async(task);
5878         dprintk("<-- %s status=%d\n", __func__, ret);
5879         return ret;
5880 }
5881
5882 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5883 {
5884         struct rpc_task *task;
5885         int ret;
5886
5887         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
5888         if (IS_ERR(task)) {
5889                 ret = PTR_ERR(task);
5890                 goto out;
5891         }
5892         ret = rpc_wait_for_completion_task(task);
5893         if (!ret) {
5894                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5895
5896                 if (task->tk_status == 0)
5897                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5898                 ret = task->tk_status;
5899         }
5900         rpc_put_task(task);
5901 out:
5902         dprintk("<-- %s status=%d\n", __func__, ret);
5903         return ret;
5904 }
5905
5906 struct nfs4_reclaim_complete_data {
5907         struct nfs_client *clp;
5908         struct nfs41_reclaim_complete_args arg;
5909         struct nfs41_reclaim_complete_res res;
5910 };
5911
5912 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5913 {
5914         struct nfs4_reclaim_complete_data *calldata = data;
5915
5916         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5917         if (nfs41_setup_sequence(calldata->clp->cl_session,
5918                                 &calldata->arg.seq_args,
5919                                 &calldata->res.seq_res, task))
5920                 return;
5921
5922         rpc_call_start(task);
5923 }
5924
5925 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5926 {
5927         switch(task->tk_status) {
5928         case 0:
5929         case -NFS4ERR_COMPLETE_ALREADY:
5930         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5931                 break;
5932         case -NFS4ERR_DELAY:
5933                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5934                 /* fall through */
5935         case -NFS4ERR_RETRY_UNCACHED_REP:
5936                 return -EAGAIN;
5937         default:
5938                 nfs4_schedule_lease_recovery(clp);
5939         }
5940         return 0;
5941 }
5942
5943 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5944 {
5945         struct nfs4_reclaim_complete_data *calldata = data;
5946         struct nfs_client *clp = calldata->clp;
5947         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5948
5949         dprintk("--> %s\n", __func__);
5950         if (!nfs41_sequence_done(task, res))
5951                 return;
5952
5953         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5954                 rpc_restart_call_prepare(task);
5955                 return;
5956         }
5957         dprintk("<-- %s\n", __func__);
5958 }
5959
5960 static void nfs4_free_reclaim_complete_data(void *data)
5961 {
5962         struct nfs4_reclaim_complete_data *calldata = data;
5963
5964         kfree(calldata);
5965 }
5966
5967 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5968         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5969         .rpc_call_done = nfs4_reclaim_complete_done,
5970         .rpc_release = nfs4_free_reclaim_complete_data,
5971 };
5972
5973 /*
5974  * Issue a global reclaim complete.
5975  */
5976 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5977 {
5978         struct nfs4_reclaim_complete_data *calldata;
5979         struct rpc_task *task;
5980         struct rpc_message msg = {
5981                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5982         };
5983         struct rpc_task_setup task_setup_data = {
5984                 .rpc_client = clp->cl_rpcclient,
5985                 .rpc_message = &msg,
5986                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5987                 .flags = RPC_TASK_ASYNC,
5988         };
5989         int status = -ENOMEM;
5990
5991         dprintk("--> %s\n", __func__);
5992         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5993         if (calldata == NULL)
5994                 goto out;
5995         calldata->clp = clp;
5996         calldata->arg.one_fs = 0;
5997
5998         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5999         msg.rpc_argp = &calldata->arg;
6000         msg.rpc_resp = &calldata->res;
6001         task_setup_data.callback_data = calldata;
6002         task = rpc_run_task(&task_setup_data);
6003         if (IS_ERR(task)) {
6004                 status = PTR_ERR(task);
6005                 goto out;
6006         }
6007         status = nfs4_wait_for_completion_rpc_task(task);
6008         if (status == 0)
6009                 status = task->tk_status;
6010         rpc_put_task(task);
6011         return 0;
6012 out:
6013         dprintk("<-- %s status=%d\n", __func__, status);
6014         return status;
6015 }
6016
6017 static void
6018 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6019 {
6020         struct nfs4_layoutget *lgp = calldata;
6021         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6022         struct nfs4_session *session = nfs4_get_session(server);
6023
6024         dprintk("--> %s\n", __func__);
6025         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6026          * right now covering the LAYOUTGET we are about to send.
6027          * However, that is not so catastrophic, and there seems
6028          * to be no way to prevent it completely.
6029          */
6030         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6031                                 &lgp->res.seq_res, task))
6032                 return;
6033         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6034                                           NFS_I(lgp->args.inode)->layout,
6035                                           lgp->args.ctx->state)) {
6036                 rpc_exit(task, NFS4_OK);
6037                 return;
6038         }
6039         rpc_call_start(task);
6040 }
6041
6042 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6043 {
6044         struct nfs4_layoutget *lgp = calldata;
6045         struct inode *inode = lgp->args.inode;
6046         struct nfs_server *server = NFS_SERVER(inode);
6047         struct pnfs_layout_hdr *lo;
6048         struct nfs4_state *state = NULL;
6049
6050         dprintk("--> %s\n", __func__);
6051
6052         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6053                 goto out;
6054
6055         switch (task->tk_status) {
6056         case 0:
6057                 goto out;
6058         case -NFS4ERR_LAYOUTTRYLATER:
6059         case -NFS4ERR_RECALLCONFLICT:
6060                 task->tk_status = -NFS4ERR_DELAY;
6061                 break;
6062         case -NFS4ERR_EXPIRED:
6063         case -NFS4ERR_BAD_STATEID:
6064                 spin_lock(&inode->i_lock);
6065                 lo = NFS_I(inode)->layout;
6066                 if (!lo || list_empty(&lo->plh_segs)) {
6067                         spin_unlock(&inode->i_lock);
6068                         /* If the open stateid was bad, then recover it. */
6069                         state = lgp->args.ctx->state;
6070                 } else {
6071                         LIST_HEAD(head);
6072
6073                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6074                         spin_unlock(&inode->i_lock);
6075                         /* Mark the bad layout state as invalid, then
6076                          * retry using the open stateid. */
6077                         pnfs_free_lseg_list(&head);
6078                 }
6079         }
6080         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6081                 rpc_restart_call_prepare(task);
6082 out:
6083         dprintk("<-- %s\n", __func__);
6084 }
6085
6086 static size_t max_response_pages(struct nfs_server *server)
6087 {
6088         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6089         return nfs_page_array_len(0, max_resp_sz);
6090 }
6091
6092 static void nfs4_free_pages(struct page **pages, size_t size)
6093 {
6094         int i;
6095
6096         if (!pages)
6097                 return;
6098
6099         for (i = 0; i < size; i++) {
6100                 if (!pages[i])
6101                         break;
6102                 __free_page(pages[i]);
6103         }
6104         kfree(pages);
6105 }
6106
6107 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6108 {
6109         struct page **pages;
6110         int i;
6111
6112         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6113         if (!pages) {
6114                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6115                 return NULL;
6116         }
6117
6118         for (i = 0; i < size; i++) {
6119                 pages[i] = alloc_page(gfp_flags);
6120                 if (!pages[i]) {
6121                         dprintk("%s: failed to allocate page\n", __func__);
6122                         nfs4_free_pages(pages, size);
6123                         return NULL;
6124                 }
6125         }
6126
6127         return pages;
6128 }
6129
6130 static void nfs4_layoutget_release(void *calldata)
6131 {
6132         struct nfs4_layoutget *lgp = calldata;
6133         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6134         size_t max_pages = max_response_pages(server);
6135
6136         dprintk("--> %s\n", __func__);
6137         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6138         put_nfs_open_context(lgp->args.ctx);
6139         kfree(calldata);
6140         dprintk("<-- %s\n", __func__);
6141 }
6142
6143 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6144         .rpc_call_prepare = nfs4_layoutget_prepare,
6145         .rpc_call_done = nfs4_layoutget_done,
6146         .rpc_release = nfs4_layoutget_release,
6147 };
6148
6149 struct pnfs_layout_segment *
6150 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6151 {
6152         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6153         size_t max_pages = max_response_pages(server);
6154         struct rpc_task *task;
6155         struct rpc_message msg = {
6156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6157                 .rpc_argp = &lgp->args,
6158                 .rpc_resp = &lgp->res,
6159         };
6160         struct rpc_task_setup task_setup_data = {
6161                 .rpc_client = server->client,
6162                 .rpc_message = &msg,
6163                 .callback_ops = &nfs4_layoutget_call_ops,
6164                 .callback_data = lgp,
6165                 .flags = RPC_TASK_ASYNC,
6166         };
6167         struct pnfs_layout_segment *lseg = NULL;
6168         int status = 0;
6169
6170         dprintk("--> %s\n", __func__);
6171
6172         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6173         if (!lgp->args.layout.pages) {
6174                 nfs4_layoutget_release(lgp);
6175                 return ERR_PTR(-ENOMEM);
6176         }
6177         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6178
6179         lgp->res.layoutp = &lgp->args.layout;
6180         lgp->res.seq_res.sr_slot = NULL;
6181         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6182         task = rpc_run_task(&task_setup_data);
6183         if (IS_ERR(task))
6184                 return ERR_CAST(task);
6185         status = nfs4_wait_for_completion_rpc_task(task);
6186         if (status == 0)
6187                 status = task->tk_status;
6188         if (status == 0)
6189                 lseg = pnfs_layout_process(lgp);
6190         rpc_put_task(task);
6191         dprintk("<-- %s status=%d\n", __func__, status);
6192         if (status)
6193                 return ERR_PTR(status);
6194         return lseg;
6195 }
6196
6197 static void
6198 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6199 {
6200         struct nfs4_layoutreturn *lrp = calldata;
6201
6202         dprintk("--> %s\n", __func__);
6203         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6204                                 &lrp->res.seq_res, task))
6205                 return;
6206         rpc_call_start(task);
6207 }
6208
6209 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6210 {
6211         struct nfs4_layoutreturn *lrp = calldata;
6212         struct nfs_server *server;
6213
6214         dprintk("--> %s\n", __func__);
6215
6216         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6217                 return;
6218
6219         server = NFS_SERVER(lrp->args.inode);
6220         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6221                 rpc_restart_call_prepare(task);
6222                 return;
6223         }
6224         dprintk("<-- %s\n", __func__);
6225 }
6226
6227 static void nfs4_layoutreturn_release(void *calldata)
6228 {
6229         struct nfs4_layoutreturn *lrp = calldata;
6230         struct pnfs_layout_hdr *lo = lrp->args.layout;
6231
6232         dprintk("--> %s\n", __func__);
6233         spin_lock(&lo->plh_inode->i_lock);
6234         if (lrp->res.lrs_present)
6235                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6236         lo->plh_block_lgets--;
6237         spin_unlock(&lo->plh_inode->i_lock);
6238         pnfs_put_layout_hdr(lrp->args.layout);
6239         kfree(calldata);
6240         dprintk("<-- %s\n", __func__);
6241 }
6242
6243 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6244         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6245         .rpc_call_done = nfs4_layoutreturn_done,
6246         .rpc_release = nfs4_layoutreturn_release,
6247 };
6248
6249 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6250 {
6251         struct rpc_task *task;
6252         struct rpc_message msg = {
6253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6254                 .rpc_argp = &lrp->args,
6255                 .rpc_resp = &lrp->res,
6256         };
6257         struct rpc_task_setup task_setup_data = {
6258                 .rpc_client = lrp->clp->cl_rpcclient,
6259                 .rpc_message = &msg,
6260                 .callback_ops = &nfs4_layoutreturn_call_ops,
6261                 .callback_data = lrp,
6262         };
6263         int status;
6264
6265         dprintk("--> %s\n", __func__);
6266         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6267         task = rpc_run_task(&task_setup_data);
6268         if (IS_ERR(task))
6269                 return PTR_ERR(task);
6270         status = task->tk_status;
6271         dprintk("<-- %s status=%d\n", __func__, status);
6272         rpc_put_task(task);
6273         return status;
6274 }
6275
6276 /*
6277  * Retrieve the list of Data Server devices from the MDS.
6278  */
6279 static int _nfs4_getdevicelist(struct nfs_server *server,
6280                                     const struct nfs_fh *fh,
6281                                     struct pnfs_devicelist *devlist)
6282 {
6283         struct nfs4_getdevicelist_args args = {
6284                 .fh = fh,
6285                 .layoutclass = server->pnfs_curr_ld->id,
6286         };
6287         struct nfs4_getdevicelist_res res = {
6288                 .devlist = devlist,
6289         };
6290         struct rpc_message msg = {
6291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6292                 .rpc_argp = &args,
6293                 .rpc_resp = &res,
6294         };
6295         int status;
6296
6297         dprintk("--> %s\n", __func__);
6298         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6299                                 &res.seq_res, 0);
6300         dprintk("<-- %s status=%d\n", __func__, status);
6301         return status;
6302 }
6303
6304 int nfs4_proc_getdevicelist(struct nfs_server *server,
6305                             const struct nfs_fh *fh,
6306                             struct pnfs_devicelist *devlist)
6307 {
6308         struct nfs4_exception exception = { };
6309         int err;
6310
6311         do {
6312                 err = nfs4_handle_exception(server,
6313                                 _nfs4_getdevicelist(server, fh, devlist),
6314                                 &exception);
6315         } while (exception.retry);
6316
6317         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6318                 err, devlist->num_devs);
6319
6320         return err;
6321 }
6322 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6323
6324 static int
6325 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6326 {
6327         struct nfs4_getdeviceinfo_args args = {
6328                 .pdev = pdev,
6329         };
6330         struct nfs4_getdeviceinfo_res res = {
6331                 .pdev = pdev,
6332         };
6333         struct rpc_message msg = {
6334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6335                 .rpc_argp = &args,
6336                 .rpc_resp = &res,
6337         };
6338         int status;
6339
6340         dprintk("--> %s\n", __func__);
6341         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6342         dprintk("<-- %s status=%d\n", __func__, status);
6343
6344         return status;
6345 }
6346
6347 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6348 {
6349         struct nfs4_exception exception = { };
6350         int err;
6351
6352         do {
6353                 err = nfs4_handle_exception(server,
6354                                         _nfs4_proc_getdeviceinfo(server, pdev),
6355                                         &exception);
6356         } while (exception.retry);
6357         return err;
6358 }
6359 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6360
6361 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6362 {
6363         struct nfs4_layoutcommit_data *data = calldata;
6364         struct nfs_server *server = NFS_SERVER(data->args.inode);
6365         struct nfs4_session *session = nfs4_get_session(server);
6366
6367         if (nfs41_setup_sequence(session, &data->args.seq_args,
6368                                 &data->res.seq_res, task))
6369                 return;
6370         rpc_call_start(task);
6371 }
6372
6373 static void
6374 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6375 {
6376         struct nfs4_layoutcommit_data *data = calldata;
6377         struct nfs_server *server = NFS_SERVER(data->args.inode);
6378
6379         if (!nfs41_sequence_done(task, &data->res.seq_res))
6380                 return;
6381
6382         switch (task->tk_status) { /* Just ignore these failures */
6383         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6384         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6385         case -NFS4ERR_BADLAYOUT:     /* no layout */
6386         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6387                 task->tk_status = 0;
6388                 break;
6389         case 0:
6390                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6391                                                    data->res.fattr);
6392                 break;
6393         default:
6394                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6395                         rpc_restart_call_prepare(task);
6396                         return;
6397                 }
6398         }
6399 }
6400
6401 static void nfs4_layoutcommit_release(void *calldata)
6402 {
6403         struct nfs4_layoutcommit_data *data = calldata;
6404         struct pnfs_layout_segment *lseg, *tmp;
6405         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6406
6407         pnfs_cleanup_layoutcommit(data);
6408         /* Matched by references in pnfs_set_layoutcommit */
6409         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6410                 list_del_init(&lseg->pls_lc_list);
6411                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6412                                        &lseg->pls_flags))
6413                         pnfs_put_lseg(lseg);
6414         }
6415
6416         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6417         smp_mb__after_clear_bit();
6418         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6419
6420         put_rpccred(data->cred);
6421         kfree(data);
6422 }
6423
6424 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6425         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6426         .rpc_call_done = nfs4_layoutcommit_done,
6427         .rpc_release = nfs4_layoutcommit_release,
6428 };
6429
6430 int
6431 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6432 {
6433         struct rpc_message msg = {
6434                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6435                 .rpc_argp = &data->args,
6436                 .rpc_resp = &data->res,
6437                 .rpc_cred = data->cred,
6438         };
6439         struct rpc_task_setup task_setup_data = {
6440                 .task = &data->task,
6441                 .rpc_client = NFS_CLIENT(data->args.inode),
6442                 .rpc_message = &msg,
6443                 .callback_ops = &nfs4_layoutcommit_ops,
6444                 .callback_data = data,
6445                 .flags = RPC_TASK_ASYNC,
6446         };
6447         struct rpc_task *task;
6448         int status = 0;
6449
6450         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6451                 "lbw: %llu inode %lu\n",
6452                 data->task.tk_pid, sync,
6453                 data->args.lastbytewritten,
6454                 data->args.inode->i_ino);
6455
6456         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6457         task = rpc_run_task(&task_setup_data);
6458         if (IS_ERR(task))
6459                 return PTR_ERR(task);
6460         if (sync == false)
6461                 goto out;
6462         status = nfs4_wait_for_completion_rpc_task(task);
6463         if (status != 0)
6464                 goto out;
6465         status = task->tk_status;
6466 out:
6467         dprintk("%s: status %d\n", __func__, status);
6468         rpc_put_task(task);
6469         return status;
6470 }
6471
6472 static int
6473 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6474                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6475 {
6476         struct nfs41_secinfo_no_name_args args = {
6477                 .style = SECINFO_STYLE_CURRENT_FH,
6478         };
6479         struct nfs4_secinfo_res res = {
6480                 .flavors = flavors,
6481         };
6482         struct rpc_message msg = {
6483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6484                 .rpc_argp = &args,
6485                 .rpc_resp = &res,
6486         };
6487         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6488 }
6489
6490 static int
6491 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6492                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6493 {
6494         struct nfs4_exception exception = { };
6495         int err;
6496         do {
6497                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6498                 switch (err) {
6499                 case 0:
6500                 case -NFS4ERR_WRONGSEC:
6501                 case -NFS4ERR_NOTSUPP:
6502                         goto out;
6503                 default:
6504                         err = nfs4_handle_exception(server, err, &exception);
6505                 }
6506         } while (exception.retry);
6507 out:
6508         return err;
6509 }
6510
6511 static int
6512 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6513                     struct nfs_fsinfo *info)
6514 {
6515         int err;
6516         struct page *page;
6517         rpc_authflavor_t flavor;
6518         struct nfs4_secinfo_flavors *flavors;
6519
6520         page = alloc_page(GFP_KERNEL);
6521         if (!page) {
6522                 err = -ENOMEM;
6523                 goto out;
6524         }
6525
6526         flavors = page_address(page);
6527         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6528
6529         /*
6530          * Fall back on "guess and check" method if
6531          * the server doesn't support SECINFO_NO_NAME
6532          */
6533         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6534                 err = nfs4_find_root_sec(server, fhandle, info);
6535                 goto out_freepage;
6536         }
6537         if (err)
6538                 goto out_freepage;
6539
6540         flavor = nfs_find_best_sec(flavors);
6541         if (err == 0)
6542                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6543
6544 out_freepage:
6545         put_page(page);
6546         if (err == -EACCES)
6547                 return -EPERM;
6548 out:
6549         return err;
6550 }
6551
6552 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6553 {
6554         int status;
6555         struct nfs41_test_stateid_args args = {
6556                 .stateid = stateid,
6557         };
6558         struct nfs41_test_stateid_res res;
6559         struct rpc_message msg = {
6560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6561                 .rpc_argp = &args,
6562                 .rpc_resp = &res,
6563         };
6564
6565         dprintk("NFS call  test_stateid %p\n", stateid);
6566         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6567         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6568         if (status != NFS_OK) {
6569                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6570                 return status;
6571         }
6572         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6573         return -res.status;
6574 }
6575
6576 /**
6577  * nfs41_test_stateid - perform a TEST_STATEID operation
6578  *
6579  * @server: server / transport on which to perform the operation
6580  * @stateid: state ID to test
6581  *
6582  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6583  * Otherwise a negative NFS4ERR value is returned if the operation
6584  * failed or the state ID is not currently valid.
6585  */
6586 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6587 {
6588         struct nfs4_exception exception = { };
6589         int err;
6590         do {
6591                 err = _nfs41_test_stateid(server, stateid);
6592                 if (err != -NFS4ERR_DELAY)
6593                         break;
6594                 nfs4_handle_exception(server, err, &exception);
6595         } while (exception.retry);
6596         return err;
6597 }
6598
6599 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6600 {
6601         struct nfs41_free_stateid_args args = {
6602                 .stateid = stateid,
6603         };
6604         struct nfs41_free_stateid_res res;
6605         struct rpc_message msg = {
6606                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6607                 .rpc_argp = &args,
6608                 .rpc_resp = &res,
6609         };
6610         int status;
6611
6612         dprintk("NFS call  free_stateid %p\n", stateid);
6613         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6614         status = nfs4_call_sync_sequence(server->client, server, &msg,
6615                                          &args.seq_args, &res.seq_res, 1);
6616         dprintk("NFS reply free_stateid: %d\n", status);
6617         return status;
6618 }
6619
6620 /**
6621  * nfs41_free_stateid - perform a FREE_STATEID operation
6622  *
6623  * @server: server / transport on which to perform the operation
6624  * @stateid: state ID to release
6625  *
6626  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6627  * negative NFS4ERR value is returned.
6628  */
6629 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6630 {
6631         struct nfs4_exception exception = { };
6632         int err;
6633         do {
6634                 err = _nfs4_free_stateid(server, stateid);
6635                 if (err != -NFS4ERR_DELAY)
6636                         break;
6637                 nfs4_handle_exception(server, err, &exception);
6638         } while (exception.retry);
6639         return err;
6640 }
6641
6642 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6643                 const nfs4_stateid *s2)
6644 {
6645         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6646                 return false;
6647
6648         if (s1->seqid == s2->seqid)
6649                 return true;
6650         if (s1->seqid == 0 || s2->seqid == 0)
6651                 return true;
6652
6653         return false;
6654 }
6655
6656 #endif /* CONFIG_NFS_V4_1 */
6657
6658 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6659                 const nfs4_stateid *s2)
6660 {
6661         return nfs4_stateid_match(s1, s2);
6662 }
6663
6664
6665 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6666         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6667         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6668         .recover_open   = nfs4_open_reclaim,
6669         .recover_lock   = nfs4_lock_reclaim,
6670         .establish_clid = nfs4_init_clientid,
6671         .get_clid_cred  = nfs4_get_setclientid_cred,
6672         .detect_trunking = nfs40_discover_server_trunking,
6673 };
6674
6675 #if defined(CONFIG_NFS_V4_1)
6676 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6677         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6678         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6679         .recover_open   = nfs4_open_reclaim,
6680         .recover_lock   = nfs4_lock_reclaim,
6681         .establish_clid = nfs41_init_clientid,
6682         .get_clid_cred  = nfs4_get_exchange_id_cred,
6683         .reclaim_complete = nfs41_proc_reclaim_complete,
6684         .detect_trunking = nfs41_discover_server_trunking,
6685 };
6686 #endif /* CONFIG_NFS_V4_1 */
6687
6688 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6689         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6690         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6691         .recover_open   = nfs4_open_expired,
6692         .recover_lock   = nfs4_lock_expired,
6693         .establish_clid = nfs4_init_clientid,
6694         .get_clid_cred  = nfs4_get_setclientid_cred,
6695 };
6696
6697 #if defined(CONFIG_NFS_V4_1)
6698 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6699         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6700         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6701         .recover_open   = nfs41_open_expired,
6702         .recover_lock   = nfs41_lock_expired,
6703         .establish_clid = nfs41_init_clientid,
6704         .get_clid_cred  = nfs4_get_exchange_id_cred,
6705 };
6706 #endif /* CONFIG_NFS_V4_1 */
6707
6708 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6709         .sched_state_renewal = nfs4_proc_async_renew,
6710         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6711         .renew_lease = nfs4_proc_renew,
6712 };
6713
6714 #if defined(CONFIG_NFS_V4_1)
6715 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6716         .sched_state_renewal = nfs41_proc_async_sequence,
6717         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6718         .renew_lease = nfs4_proc_sequence,
6719 };
6720 #endif
6721
6722 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6723         .minor_version = 0,
6724         .call_sync = _nfs4_call_sync,
6725         .match_stateid = nfs4_match_stateid,
6726         .find_root_sec = nfs4_find_root_sec,
6727         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6728         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6729         .state_renewal_ops = &nfs40_state_renewal_ops,
6730 };
6731
6732 #if defined(CONFIG_NFS_V4_1)
6733 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6734         .minor_version = 1,
6735         .call_sync = _nfs4_call_sync_session,
6736         .match_stateid = nfs41_match_stateid,
6737         .find_root_sec = nfs41_find_root_sec,
6738         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6739         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6740         .state_renewal_ops = &nfs41_state_renewal_ops,
6741 };
6742 #endif
6743
6744 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6745         [0] = &nfs_v4_0_minor_ops,
6746 #if defined(CONFIG_NFS_V4_1)
6747         [1] = &nfs_v4_1_minor_ops,
6748 #endif
6749 };
6750
6751 const struct inode_operations nfs4_dir_inode_operations = {
6752         .create         = nfs_create,
6753         .lookup         = nfs_lookup,
6754         .atomic_open    = nfs_atomic_open,
6755         .link           = nfs_link,
6756         .unlink         = nfs_unlink,
6757         .symlink        = nfs_symlink,
6758         .mkdir          = nfs_mkdir,
6759         .rmdir          = nfs_rmdir,
6760         .mknod          = nfs_mknod,
6761         .rename         = nfs_rename,
6762         .permission     = nfs_permission,
6763         .getattr        = nfs_getattr,
6764         .setattr        = nfs_setattr,
6765         .getxattr       = generic_getxattr,
6766         .setxattr       = generic_setxattr,
6767         .listxattr      = generic_listxattr,
6768         .removexattr    = generic_removexattr,
6769 };
6770
6771 static const struct inode_operations nfs4_file_inode_operations = {
6772         .permission     = nfs_permission,
6773         .getattr        = nfs_getattr,
6774         .setattr        = nfs_setattr,
6775         .getxattr       = generic_getxattr,
6776         .setxattr       = generic_setxattr,
6777         .listxattr      = generic_listxattr,
6778         .removexattr    = generic_removexattr,
6779 };
6780
6781 const struct nfs_rpc_ops nfs_v4_clientops = {
6782         .version        = 4,                    /* protocol version */
6783         .dentry_ops     = &nfs4_dentry_operations,
6784         .dir_inode_ops  = &nfs4_dir_inode_operations,
6785         .file_inode_ops = &nfs4_file_inode_operations,
6786         .file_ops       = &nfs4_file_operations,
6787         .getroot        = nfs4_proc_get_root,
6788         .submount       = nfs4_submount,
6789         .try_mount      = nfs4_try_mount,
6790         .getattr        = nfs4_proc_getattr,
6791         .setattr        = nfs4_proc_setattr,
6792         .lookup         = nfs4_proc_lookup,
6793         .access         = nfs4_proc_access,
6794         .readlink       = nfs4_proc_readlink,
6795         .create         = nfs4_proc_create,
6796         .remove         = nfs4_proc_remove,
6797         .unlink_setup   = nfs4_proc_unlink_setup,
6798         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6799         .unlink_done    = nfs4_proc_unlink_done,
6800         .rename         = nfs4_proc_rename,
6801         .rename_setup   = nfs4_proc_rename_setup,
6802         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6803         .rename_done    = nfs4_proc_rename_done,
6804         .link           = nfs4_proc_link,
6805         .symlink        = nfs4_proc_symlink,
6806         .mkdir          = nfs4_proc_mkdir,
6807         .rmdir          = nfs4_proc_remove,
6808         .readdir        = nfs4_proc_readdir,
6809         .mknod          = nfs4_proc_mknod,
6810         .statfs         = nfs4_proc_statfs,
6811         .fsinfo         = nfs4_proc_fsinfo,
6812         .pathconf       = nfs4_proc_pathconf,
6813         .set_capabilities = nfs4_server_capabilities,
6814         .decode_dirent  = nfs4_decode_dirent,
6815         .read_setup     = nfs4_proc_read_setup,
6816         .read_pageio_init = pnfs_pageio_init_read,
6817         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6818         .read_done      = nfs4_read_done,
6819         .write_setup    = nfs4_proc_write_setup,
6820         .write_pageio_init = pnfs_pageio_init_write,
6821         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6822         .write_done     = nfs4_write_done,
6823         .commit_setup   = nfs4_proc_commit_setup,
6824         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6825         .commit_done    = nfs4_commit_done,
6826         .lock           = nfs4_proc_lock,
6827         .clear_acl_cache = nfs4_zap_acl_attr,
6828         .close_context  = nfs4_close_context,
6829         .open_context   = nfs4_atomic_open,
6830         .have_delegation = nfs4_have_delegation,
6831         .return_delegation = nfs4_inode_return_delegation,
6832         .alloc_client   = nfs4_alloc_client,
6833         .init_client    = nfs4_init_client,
6834         .free_client    = nfs4_free_client,
6835         .create_server  = nfs4_create_server,
6836         .clone_server   = nfs_clone_server,
6837 };
6838
6839 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6840         .prefix = XATTR_NAME_NFSV4_ACL,
6841         .list   = nfs4_xattr_list_nfs4_acl,
6842         .get    = nfs4_xattr_get_nfs4_acl,
6843         .set    = nfs4_xattr_set_nfs4_acl,
6844 };
6845
6846 const struct xattr_handler *nfs4_xattr_handlers[] = {
6847         &nfs4_xattr_nfs4_acl_handler,
6848         NULL
6849 };
6850
6851 /*
6852  * Local variables:
6853  *  c-basic-offset: 8
6854  * End:
6855  */