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/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83
  84 /* Prevent leaks of NFSv4 errors into userland */
  85 static int nfs4_map_errors(int err)
  86 {
  87         if (err >= -1000)
  88                 return err;
  89         switch (err) {
  90         case -NFS4ERR_RESOURCE:
  91                 return -EREMOTEIO;
  92         case -NFS4ERR_WRONGSEC:
  93                 return -EPERM;
  94         case -NFS4ERR_BADOWNER:
  95         case -NFS4ERR_BADNAME:
  96                 return -EINVAL;
  97         default:
  98                 dprintk("%s could not handle NFSv4 error %d\n",
  99                                 __func__, -err);
 100                 break;
 101         }
 102         return -EIO;
 103 }
 104
 105 /*
 106  * This is our standard bitmap for GETATTR requests.
 107  */
 108 const u32 nfs4_fattr_bitmap[2] = {
 109         FATTR4_WORD0_TYPE
 110         | FATTR4_WORD0_CHANGE
 111         | FATTR4_WORD0_SIZE
 112         | FATTR4_WORD0_FSID
 113         | FATTR4_WORD0_FILEID,
 114         FATTR4_WORD1_MODE
 115         | FATTR4_WORD1_NUMLINKS
 116         | FATTR4_WORD1_OWNER
 117         | FATTR4_WORD1_OWNER_GROUP
 118         | FATTR4_WORD1_RAWDEV
 119         | FATTR4_WORD1_SPACE_USED
 120         | FATTR4_WORD1_TIME_ACCESS
 121         | FATTR4_WORD1_TIME_METADATA
 122         | FATTR4_WORD1_TIME_MODIFY
 123 };
 124
 125 const u32 nfs4_statfs_bitmap[2] = {
 126         FATTR4_WORD0_FILES_AVAIL
 127         | FATTR4_WORD0_FILES_FREE
 128         | FATTR4_WORD0_FILES_TOTAL,
 129         FATTR4_WORD1_SPACE_AVAIL
 130         | FATTR4_WORD1_SPACE_FREE
 131         | FATTR4_WORD1_SPACE_TOTAL
 132 };
 133
 134 const u32 nfs4_pathconf_bitmap[2] = {
 135         FATTR4_WORD0_MAXLINK
 136         | FATTR4_WORD0_MAXNAME,
 137         0
 138 };
 139
 140 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 141                         | FATTR4_WORD0_MAXREAD
 142                         | FATTR4_WORD0_MAXWRITE
 143                         | FATTR4_WORD0_LEASE_TIME,
 144                         FATTR4_WORD1_TIME_DELTA
 145                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 146 };
 147
 148 const u32 nfs4_fs_locations_bitmap[2] = {
 149         FATTR4_WORD0_TYPE
 150         | FATTR4_WORD0_CHANGE
 151         | FATTR4_WORD0_SIZE
 152         | FATTR4_WORD0_FSID
 153         | FATTR4_WORD0_FILEID
 154         | FATTR4_WORD0_FS_LOCATIONS,
 155         FATTR4_WORD1_MODE
 156         | FATTR4_WORD1_NUMLINKS
 157         | FATTR4_WORD1_OWNER
 158         | FATTR4_WORD1_OWNER_GROUP
 159         | FATTR4_WORD1_RAWDEV
 160         | FATTR4_WORD1_SPACE_USED
 161         | FATTR4_WORD1_TIME_ACCESS
 162         | FATTR4_WORD1_TIME_METADATA
 163         | FATTR4_WORD1_TIME_MODIFY
 164         | FATTR4_WORD1_MOUNTED_ON_FILEID
 165 };
 166
 167 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 168                 struct nfs4_readdir_arg *readdir)
 169 {
 170         __be32 *start, *p;
 171
 172         BUG_ON(readdir->count < 80);
 173         if (cookie > 2) {
 174                 readdir->cookie = cookie;
 175                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 176                 return;
 177         }
 178
 179         readdir->cookie = 0;
 180         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 181         if (cookie == 2)
 182                 return;
 183
 184         /*
 185          * NFSv4 servers do not return entries for '.' and '..'
 186          * Therefore, we fake these entries here.  We let '.'
 187          * have cookie 0 and '..' have cookie 1.  Note that
 188          * when talking to the server, we always send cookie 0
 189          * instead of 1 or 2.
 190          */
 191         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 192
 193         if (cookie == 0) {
 194                 *p++ = xdr_one;                                  /* next */
 195                 *p++ = xdr_zero;                   /* cookie, first word */
 196                 *p++ = xdr_one;                   /* cookie, second word */
 197                 *p++ = xdr_one;                             /* entry len */
 198                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 199                 p++;
 200                 *p++ = xdr_one;                         /* bitmap length */
 201                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 202                 *p++ = htonl(8);              /* attribute buffer length */
 203                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 204         }
 205
 206         *p++ = xdr_one;                                  /* next */
 207         *p++ = xdr_zero;                   /* cookie, first word */
 208         *p++ = xdr_two;                   /* cookie, second word */
 209         *p++ = xdr_two;                             /* entry len */
 210         memcpy(p, "..\0\0", 4);                         /* entry */
 211         p++;
 212         *p++ = xdr_one;                         /* bitmap length */
 213         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 214         *p++ = htonl(8);              /* attribute buffer length */
 215         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 216
 217         readdir->pgbase = (char *)p - (char *)start;
 218         readdir->count -= readdir->pgbase;
 219         kunmap_atomic(start, KM_USER0);
 220 }
 221
 222 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 223 {
 224         int res;
 225
 226         might_sleep();
 227
 228         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 229                         nfs_wait_bit_killable, TASK_KILLABLE);
 230         return res;
 231 }
 232
 233 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 234 {
 235         int res = 0;
 236
 237         might_sleep();
 238
 239         if (*timeout <= 0)
 240                 *timeout = NFS4_POLL_RETRY_MIN;
 241         if (*timeout > NFS4_POLL_RETRY_MAX)
 242                 *timeout = NFS4_POLL_RETRY_MAX;
 243         schedule_timeout_killable(*timeout);
 244         if (fatal_signal_pending(current))
 245                 res = -ERESTARTSYS;
 246         *timeout <<= 1;
 247         return res;
 248 }
 249
 250 /* This is the error handling routine for processes that are allowed
 251  * to sleep.
 252  */
 253 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 254 {
 255         struct nfs_client *clp = server->nfs_client;
 256         struct nfs4_state *state = exception->state;
 257         int ret = errorcode;
 258
 259         exception->retry = 0;
 260         switch(errorcode) {
 261                 case 0:
 262                         return 0;
 263                 case -NFS4ERR_ADMIN_REVOKED:
 264                 case -NFS4ERR_BAD_STATEID:
 265                 case -NFS4ERR_OPENMODE:
 266                         if (state == NULL)
 267                                 break;
 268                         nfs4_schedule_stateid_recovery(server, state);
 269                         goto wait_on_recovery;
 270                 case -NFS4ERR_EXPIRED:
 271                         if (state != NULL)
 272                                 nfs4_schedule_stateid_recovery(server, state);
 273                 case -NFS4ERR_STALE_STATEID:
 274                 case -NFS4ERR_STALE_CLIENTID:
 275                         nfs4_schedule_lease_recovery(clp);
 276                         goto wait_on_recovery;
 277 #if defined(CONFIG_NFS_V4_1)
 278                 case -NFS4ERR_BADSESSION:
 279                 case -NFS4ERR_BADSLOT:
 280                 case -NFS4ERR_BAD_HIGH_SLOT:
 281                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 282                 case -NFS4ERR_DEADSESSION:
 283                 case -NFS4ERR_SEQ_FALSE_RETRY:
 284                 case -NFS4ERR_SEQ_MISORDERED:
 285                         dprintk("%s ERROR: %d Reset session\n", __func__,
 286                                 errorcode);
 287                         nfs4_schedule_session_recovery(clp->cl_session);
 288                         exception->retry = 1;
 289                         break;
 290 #endif /* defined(CONFIG_NFS_V4_1) */
 291                 case -NFS4ERR_FILE_OPEN:
 292                         if (exception->timeout > HZ) {
 293                                 /* We have retried a decent amount, time to
 294                                  * fail
 295                                  */
 296                                 ret = -EBUSY;
 297                                 break;
 298                         }
 299                 case -NFS4ERR_GRACE:
 300                 case -NFS4ERR_DELAY:
 301                 case -EKEYEXPIRED:
 302                         ret = nfs4_delay(server->client, &exception->timeout);
 303                         if (ret != 0)
 304                                 break;
 305                 case -NFS4ERR_RETRY_UNCACHED_REP:
 306                 case -NFS4ERR_OLD_STATEID:
 307                         exception->retry = 1;
 308                         break;
 309                 case -NFS4ERR_BADOWNER:
 310                         /* The following works around a Linux server bug! */
 311                 case -NFS4ERR_BADNAME:
 312                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 313                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 314                                 exception->retry = 1;
 315                                 printk(KERN_WARNING "NFS: v4 server %s "
 316                                                 "does not accept raw "
 317                                                 "uid/gids. "
 318                                                 "Reenabling the idmapper.\n",
 319                                                 server->nfs_client->cl_hostname);
 320                         }
 321         }
 322         /* We failed to handle the error */
 323         return nfs4_map_errors(ret);
 324 wait_on_recovery:
 325         ret = nfs4_wait_clnt_recover(clp);
 326         if (ret == 0)
 327                 exception->retry = 1;
 328         return ret;
 329 }
 330
 331
 332 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 333 {
 334         spin_lock(&clp->cl_lock);
 335         if (time_before(clp->cl_last_renewal,timestamp))
 336                 clp->cl_last_renewal = timestamp;
 337         spin_unlock(&clp->cl_lock);
 338 }
 339
 340 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 341 {
 342         do_renew_lease(server->nfs_client, timestamp);
 343 }
 344
 345 #if defined(CONFIG_NFS_V4_1)
 346
 347 /*
 348  * nfs4_free_slot - free a slot and efficiently update slot table.
 349  *
 350  * freeing a slot is trivially done by clearing its respective bit
 351  * in the bitmap.
 352  * If the freed slotid equals highest_used_slotid we want to update it
 353  * so that the server would be able to size down the slot table if needed,
 354  * otherwise we know that the highest_used_slotid is still in use.
 355  * When updating highest_used_slotid there may be "holes" in the bitmap
 356  * so we need to scan down from highest_used_slotid to 0 looking for the now
 357  * highest slotid in use.
 358  * If none found, highest_used_slotid is set to -1.
 359  *
 360  * Must be called while holding tbl->slot_tbl_lock
 361  */
 362 static void
 363 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 364 {
 365         int free_slotid = free_slot - tbl->slots;
 366         int slotid = free_slotid;
 367
 368         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 369         /* clear used bit in bitmap */
 370         __clear_bit(slotid, tbl->used_slots);
 371
 372         /* update highest_used_slotid when it is freed */
 373         if (slotid == tbl->highest_used_slotid) {
 374                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 375                 if (slotid < tbl->max_slots)
 376                         tbl->highest_used_slotid = slotid;
 377                 else
 378                         tbl->highest_used_slotid = -1;
 379         }
 380         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 381                 free_slotid, tbl->highest_used_slotid);
 382 }
 383
 384 /*
 385  * Signal state manager thread if session fore channel is drained
 386  */
 387 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 388 {
 389         struct rpc_task *task;
 390
 391         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 392                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 393                 if (task)
 394                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 395                 return;
 396         }
 397
 398         if (ses->fc_slot_table.highest_used_slotid != -1)
 399                 return;
 400
 401         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 402         complete(&ses->fc_slot_table.complete);
 403 }
 404
 405 /*
 406  * Signal state manager thread if session back channel is drained
 407  */
 408 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 409 {
 410         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 411             ses->bc_slot_table.highest_used_slotid != -1)
 412                 return;
 413         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 414         complete(&ses->bc_slot_table.complete);
 415 }
 416
 417 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 418 {
 419         struct nfs4_slot_table *tbl;
 420
 421         tbl = &res->sr_session->fc_slot_table;
 422         if (!res->sr_slot) {
 423                 /* just wake up the next guy waiting since
 424                  * we may have not consumed a slot after all */
 425                 dprintk("%s: No slot\n", __func__);
 426                 return;
 427         }
 428
 429         spin_lock(&tbl->slot_tbl_lock);
 430         nfs4_free_slot(tbl, res->sr_slot);
 431         nfs4_check_drain_fc_complete(res->sr_session);
 432         spin_unlock(&tbl->slot_tbl_lock);
 433         res->sr_slot = NULL;
 434 }
 435
 436 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 437 {
 438         unsigned long timestamp;
 439         struct nfs_client *clp;
 440
 441         /*
 442          * sr_status remains 1 if an RPC level error occurred. The server
 443          * may or may not have processed the sequence operation..
 444          * Proceed as if the server received and processed the sequence
 445          * operation.
 446          */
 447         if (res->sr_status == 1)
 448                 res->sr_status = NFS_OK;
 449
 450         /* don't increment the sequence number if the task wasn't sent */
 451         if (!RPC_WAS_SENT(task))
 452                 goto out;
 453
 454         /* Check the SEQUENCE operation status */
 455         switch (res->sr_status) {
 456         case 0:
 457                 /* Update the slot's sequence and clientid lease timer */
 458                 ++res->sr_slot->seq_nr;
 459                 timestamp = res->sr_renewal_time;
 460                 clp = res->sr_session->clp;
 461                 do_renew_lease(clp, timestamp);
 462                 /* Check sequence flags */
 463                 if (res->sr_status_flags != 0)
 464                         nfs4_schedule_lease_recovery(clp);
 465                 break;
 466         case -NFS4ERR_DELAY:
 467                 /* The server detected a resend of the RPC call and
 468                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 469                  * of RFC5661.
 470                  */
 471                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 472                         __func__,
 473                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 474                         res->sr_slot->seq_nr);
 475                 goto out_retry;
 476         default:
 477                 /* Just update the slot sequence no. */
 478                 ++res->sr_slot->seq_nr;
 479         }
 480 out:
 481         /* The session may be reset by one of the error handlers. */
 482         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 483         nfs41_sequence_free_slot(res);
 484         return 1;
 485 out_retry:
 486         if (!rpc_restart_call(task))
 487                 goto out;
 488         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 489         return 0;
 490 }
 491
 492 static int nfs4_sequence_done(struct rpc_task *task,
 493                                struct nfs4_sequence_res *res)
 494 {
 495         if (res->sr_session == NULL)
 496                 return 1;
 497         return nfs41_sequence_done(task, res);
 498 }
 499
 500 /*
 501  * nfs4_find_slot - efficiently look for a free slot
 502  *
 503  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 504  * If found, we mark the slot as used, update the highest_used_slotid,
 505  * and respectively set up the sequence operation args.
 506  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 507  *
 508  * Note: must be called with under the slot_tbl_lock.
 509  */
 510 static u8
 511 nfs4_find_slot(struct nfs4_slot_table *tbl)
 512 {
 513         int slotid;
 514         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 515         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 516
 517         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 518                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 519                 tbl->max_slots);
 520         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 521         if (slotid >= tbl->max_slots)
 522                 goto out;
 523         __set_bit(slotid, tbl->used_slots);
 524         if (slotid > tbl->highest_used_slotid)
 525                 tbl->highest_used_slotid = slotid;
 526         ret_id = slotid;
 527 out:
 528         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 529                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 530         return ret_id;
 531 }
 532
 533 int nfs41_setup_sequence(struct nfs4_session *session,
 534                                 struct nfs4_sequence_args *args,
 535                                 struct nfs4_sequence_res *res,
 536                                 int cache_reply,
 537                                 struct rpc_task *task)
 538 {
 539         struct nfs4_slot *slot;
 540         struct nfs4_slot_table *tbl;
 541         u8 slotid;
 542
 543         dprintk("--> %s\n", __func__);
 544         /* slot already allocated? */
 545         if (res->sr_slot != NULL)
 546                 return 0;
 547
 548         tbl = &session->fc_slot_table;
 549
 550         spin_lock(&tbl->slot_tbl_lock);
 551         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 552             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 553                 /*
 554                  * The state manager will wait until the slot table is empty.
 555                  * Schedule the reset thread
 556                  */
 557                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 558                 spin_unlock(&tbl->slot_tbl_lock);
 559                 dprintk("%s Schedule Session Reset\n", __func__);
 560                 return -EAGAIN;
 561         }
 562
 563         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 564             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 565                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 566                 spin_unlock(&tbl->slot_tbl_lock);
 567                 dprintk("%s enforce FIFO order\n", __func__);
 568                 return -EAGAIN;
 569         }
 570
 571         slotid = nfs4_find_slot(tbl);
 572         if (slotid == NFS4_MAX_SLOT_TABLE) {
 573                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 574                 spin_unlock(&tbl->slot_tbl_lock);
 575                 dprintk("<-- %s: no free slots\n", __func__);
 576                 return -EAGAIN;
 577         }
 578         spin_unlock(&tbl->slot_tbl_lock);
 579
 580         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 581         slot = tbl->slots + slotid;
 582         args->sa_session = session;
 583         args->sa_slotid = slotid;
 584         args->sa_cache_this = cache_reply;
 585
 586         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 587
 588         res->sr_session = session;
 589         res->sr_slot = slot;
 590         res->sr_renewal_time = jiffies;
 591         res->sr_status_flags = 0;
 592         /*
 593          * sr_status is only set in decode_sequence, and so will remain
 594          * set to 1 if an rpc level failure occurs.
 595          */
 596         res->sr_status = 1;
 597         return 0;
 598 }
 599 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 600
 601 int nfs4_setup_sequence(const struct nfs_server *server,
 602                         struct nfs4_sequence_args *args,
 603                         struct nfs4_sequence_res *res,
 604                         int cache_reply,
 605                         struct rpc_task *task)
 606 {
 607         struct nfs4_session *session = nfs4_get_session(server);
 608         int ret = 0;
 609
 610         if (session == NULL) {
 611                 args->sa_session = NULL;
 612                 res->sr_session = NULL;
 613                 goto out;
 614         }
 615
 616         dprintk("--> %s clp %p session %p sr_slot %td\n",
 617                 __func__, session->clp, session, res->sr_slot ?
 618                         res->sr_slot - session->fc_slot_table.slots : -1);
 619
 620         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 621                                    task);
 622 out:
 623         dprintk("<-- %s status=%d\n", __func__, ret);
 624         return ret;
 625 }
 626
 627 struct nfs41_call_sync_data {
 628         const struct nfs_server *seq_server;
 629         struct nfs4_sequence_args *seq_args;
 630         struct nfs4_sequence_res *seq_res;
 631         int cache_reply;
 632 };
 633
 634 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 635 {
 636         struct nfs41_call_sync_data *data = calldata;
 637
 638         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 639
 640         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 641                                 data->seq_res, data->cache_reply, task))
 642                 return;
 643         rpc_call_start(task);
 644 }
 645
 646 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 647 {
 648         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 649         nfs41_call_sync_prepare(task, calldata);
 650 }
 651
 652 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 653 {
 654         struct nfs41_call_sync_data *data = calldata;
 655
 656         nfs41_sequence_done(task, data->seq_res);
 657 }
 658
 659 struct rpc_call_ops nfs41_call_sync_ops = {
 660         .rpc_call_prepare = nfs41_call_sync_prepare,
 661         .rpc_call_done = nfs41_call_sync_done,
 662 };
 663
 664 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 665         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 666         .rpc_call_done = nfs41_call_sync_done,
 667 };
 668
 669 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 670                                    struct nfs_server *server,
 671                                    struct rpc_message *msg,
 672                                    struct nfs4_sequence_args *args,
 673                                    struct nfs4_sequence_res *res,
 674                                    int cache_reply,
 675                                    int privileged)
 676 {
 677         int ret;
 678         struct rpc_task *task;
 679         struct nfs41_call_sync_data data = {
 680                 .seq_server = server,
 681                 .seq_args = args,
 682                 .seq_res = res,
 683                 .cache_reply = cache_reply,
 684         };
 685         struct rpc_task_setup task_setup = {
 686                 .rpc_client = clnt,
 687                 .rpc_message = msg,
 688                 .callback_ops = &nfs41_call_sync_ops,
 689                 .callback_data = &data
 690         };
 691
 692         res->sr_slot = NULL;
 693         if (privileged)
 694                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 695         task = rpc_run_task(&task_setup);
 696         if (IS_ERR(task))
 697                 ret = PTR_ERR(task);
 698         else {
 699                 ret = task->tk_status;
 700                 rpc_put_task(task);
 701         }
 702         return ret;
 703 }
 704
 705 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 706                             struct nfs_server *server,
 707                             struct rpc_message *msg,
 708                             struct nfs4_sequence_args *args,
 709                             struct nfs4_sequence_res *res,
 710                             int cache_reply)
 711 {
 712         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 713 }
 714
 715 #else
 716 static int nfs4_sequence_done(struct rpc_task *task,
 717                                struct nfs4_sequence_res *res)
 718 {
 719         return 1;
 720 }
 721 #endif /* CONFIG_NFS_V4_1 */
 722
 723 int _nfs4_call_sync(struct rpc_clnt *clnt,
 724                     struct nfs_server *server,
 725                     struct rpc_message *msg,
 726                     struct nfs4_sequence_args *args,
 727                     struct nfs4_sequence_res *res,
 728                     int cache_reply)
 729 {
 730         args->sa_session = res->sr_session = NULL;
 731         return rpc_call_sync(clnt, msg, 0);
 732 }
 733
 734 static inline
 735 int nfs4_call_sync(struct rpc_clnt *clnt,
 736                    struct nfs_server *server,
 737                    struct rpc_message *msg,
 738                    struct nfs4_sequence_args *args,
 739                    struct nfs4_sequence_res *res,
 740                    int cache_reply)
 741 {
 742         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 743                                                 args, res, cache_reply);
 744 }
 745
 746 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 747 {
 748         struct nfs_inode *nfsi = NFS_I(dir);
 749
 750         spin_lock(&dir->i_lock);
 751         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 752         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 753                 nfs_force_lookup_revalidate(dir);
 754         nfsi->change_attr = cinfo->after;
 755         spin_unlock(&dir->i_lock);
 756 }
 757
 758 struct nfs4_opendata {
 759         struct kref kref;
 760         struct nfs_openargs o_arg;
 761         struct nfs_openres o_res;
 762         struct nfs_open_confirmargs c_arg;
 763         struct nfs_open_confirmres c_res;
 764         struct nfs_fattr f_attr;
 765         struct nfs_fattr dir_attr;
 766         struct path path;
 767         struct dentry *dir;
 768         struct nfs4_state_owner *owner;
 769         struct nfs4_state *state;
 770         struct iattr attrs;
 771         unsigned long timestamp;
 772         unsigned int rpc_done : 1;
 773         int rpc_status;
 774         int cancelled;
 775 };
 776
 777
 778 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 779 {
 780         p->o_res.f_attr = &p->f_attr;
 781         p->o_res.dir_attr = &p->dir_attr;
 782         p->o_res.seqid = p->o_arg.seqid;
 783         p->c_res.seqid = p->c_arg.seqid;
 784         p->o_res.server = p->o_arg.server;
 785         nfs_fattr_init(&p->f_attr);
 786         nfs_fattr_init(&p->dir_attr);
 787 }
 788
 789 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 790                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 791                 const struct iattr *attrs,
 792                 gfp_t gfp_mask)
 793 {
 794         struct dentry *parent = dget_parent(path->dentry);
 795         struct inode *dir = parent->d_inode;
 796         struct nfs_server *server = NFS_SERVER(dir);
 797         struct nfs4_opendata *p;
 798
 799         p = kzalloc(sizeof(*p), gfp_mask);
 800         if (p == NULL)
 801                 goto err;
 802         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 803         if (p->o_arg.seqid == NULL)
 804                 goto err_free;
 805         path_get(path);
 806         p->path = *path;
 807         p->dir = parent;
 808         p->owner = sp;
 809         atomic_inc(&sp->so_count);
 810         p->o_arg.fh = NFS_FH(dir);
 811         p->o_arg.open_flags = flags;
 812         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 813         p->o_arg.clientid = server->nfs_client->cl_clientid;
 814         p->o_arg.id = sp->so_owner_id.id;
 815         p->o_arg.name = &p->path.dentry->d_name;
 816         p->o_arg.server = server;
 817         p->o_arg.bitmask = server->attr_bitmask;
 818         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 819         if (flags & O_CREAT) {
 820                 u32 *s;
 821
 822                 p->o_arg.u.attrs = &p->attrs;
 823                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 824                 s = (u32 *) p->o_arg.u.verifier.data;
 825                 s[0] = jiffies;
 826                 s[1] = current->pid;
 827         }
 828         p->c_arg.fh = &p->o_res.fh;
 829         p->c_arg.stateid = &p->o_res.stateid;
 830         p->c_arg.seqid = p->o_arg.seqid;
 831         nfs4_init_opendata_res(p);
 832         kref_init(&p->kref);
 833         return p;
 834 err_free:
 835         kfree(p);
 836 err:
 837         dput(parent);
 838         return NULL;
 839 }
 840
 841 static void nfs4_opendata_free(struct kref *kref)
 842 {
 843         struct nfs4_opendata *p = container_of(kref,
 844                         struct nfs4_opendata, kref);
 845
 846         nfs_free_seqid(p->o_arg.seqid);
 847         if (p->state != NULL)
 848                 nfs4_put_open_state(p->state);
 849         nfs4_put_state_owner(p->owner);
 850         dput(p->dir);
 851         path_put(&p->path);
 852         kfree(p);
 853 }
 854
 855 static void nfs4_opendata_put(struct nfs4_opendata *p)
 856 {
 857         if (p != NULL)
 858                 kref_put(&p->kref, nfs4_opendata_free);
 859 }
 860
 861 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 862 {
 863         int ret;
 864
 865         ret = rpc_wait_for_completion_task(task);
 866         return ret;
 867 }
 868
 869 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 870 {
 871         int ret = 0;
 872
 873         if (open_mode & O_EXCL)
 874                 goto out;
 875         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 876                 case FMODE_READ:
 877                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 878                                 && state->n_rdonly != 0;
 879                         break;
 880                 case FMODE_WRITE:
 881                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 882                                 && state->n_wronly != 0;
 883                         break;
 884                 case FMODE_READ|FMODE_WRITE:
 885                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 886                                 && state->n_rdwr != 0;
 887         }
 888 out:
 889         return ret;
 890 }
 891
 892 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 893 {
 894         if ((delegation->type & fmode) != fmode)
 895                 return 0;
 896         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 897                 return 0;
 898         nfs_mark_delegation_referenced(delegation);
 899         return 1;
 900 }
 901
 902 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 903 {
 904         switch (fmode) {
 905                 case FMODE_WRITE:
 906                         state->n_wronly++;
 907                         break;
 908                 case FMODE_READ:
 909                         state->n_rdonly++;
 910                         break;
 911                 case FMODE_READ|FMODE_WRITE:
 912                         state->n_rdwr++;
 913         }
 914         nfs4_state_set_mode_locked(state, state->state | fmode);
 915 }
 916
 917 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 918 {
 919         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 920                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 921         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 922         switch (fmode) {
 923                 case FMODE_READ:
 924                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 925                         break;
 926                 case FMODE_WRITE:
 927                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 928                         break;
 929                 case FMODE_READ|FMODE_WRITE:
 930                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 931         }
 932 }
 933
 934 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 935 {
 936         write_seqlock(&state->seqlock);
 937         nfs_set_open_stateid_locked(state, stateid, fmode);
 938         write_sequnlock(&state->seqlock);
 939 }
 940
 941 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 942 {
 943         /*
 944          * Protect the call to nfs4_state_set_mode_locked and
 945          * serialise the stateid update
 946          */
 947         write_seqlock(&state->seqlock);
 948         if (deleg_stateid != NULL) {
 949                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 950                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 951         }
 952         if (open_stateid != NULL)
 953                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 954         write_sequnlock(&state->seqlock);
 955         spin_lock(&state->owner->so_lock);
 956         update_open_stateflags(state, fmode);
 957         spin_unlock(&state->owner->so_lock);
 958 }
 959
 960 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 961 {
 962         struct nfs_inode *nfsi = NFS_I(state->inode);
 963         struct nfs_delegation *deleg_cur;
 964         int ret = 0;
 965
 966         fmode &= (FMODE_READ|FMODE_WRITE);
 967
 968         rcu_read_lock();
 969         deleg_cur = rcu_dereference(nfsi->delegation);
 970         if (deleg_cur == NULL)
 971                 goto no_delegation;
 972
 973         spin_lock(&deleg_cur->lock);
 974         if (nfsi->delegation != deleg_cur ||
 975             (deleg_cur->type & fmode) != fmode)
 976                 goto no_delegation_unlock;
 977
 978         if (delegation == NULL)
 979                 delegation = &deleg_cur->stateid;
 980         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 981                 goto no_delegation_unlock;
 982
 983         nfs_mark_delegation_referenced(deleg_cur);
 984         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 985         ret = 1;
 986 no_delegation_unlock:
 987         spin_unlock(&deleg_cur->lock);
 988 no_delegation:
 989         rcu_read_unlock();
 990
 991         if (!ret && open_stateid != NULL) {
 992                 __update_open_stateid(state, open_stateid, NULL, fmode);
 993                 ret = 1;
 994         }
 995
 996         return ret;
 997 }
 998
 999
1000 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1001 {
1002         struct nfs_delegation *delegation;
1003
1004         rcu_read_lock();
1005         delegation = rcu_dereference(NFS_I(inode)->delegation);
1006         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1007                 rcu_read_unlock();
1008                 return;
1009         }
1010         rcu_read_unlock();
1011         nfs_inode_return_delegation(inode);
1012 }
1013
1014 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1015 {
1016         struct nfs4_state *state = opendata->state;
1017         struct nfs_inode *nfsi = NFS_I(state->inode);
1018         struct nfs_delegation *delegation;
1019         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1020         fmode_t fmode = opendata->o_arg.fmode;
1021         nfs4_stateid stateid;
1022         int ret = -EAGAIN;
1023
1024         for (;;) {
1025                 if (can_open_cached(state, fmode, open_mode)) {
1026                         spin_lock(&state->owner->so_lock);
1027                         if (can_open_cached(state, fmode, open_mode)) {
1028                                 update_open_stateflags(state, fmode);
1029                                 spin_unlock(&state->owner->so_lock);
1030                                 goto out_return_state;
1031                         }
1032                         spin_unlock(&state->owner->so_lock);
1033                 }
1034                 rcu_read_lock();
1035                 delegation = rcu_dereference(nfsi->delegation);
1036                 if (delegation == NULL ||
1037                     !can_open_delegated(delegation, fmode)) {
1038                         rcu_read_unlock();
1039                         break;
1040                 }
1041                 /* Save the delegation */
1042                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1043                 rcu_read_unlock();
1044                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1045                 if (ret != 0)
1046                         goto out;
1047                 ret = -EAGAIN;
1048
1049                 /* Try to update the stateid using the delegation */
1050                 if (update_open_stateid(state, NULL, &stateid, fmode))
1051                         goto out_return_state;
1052         }
1053 out:
1054         return ERR_PTR(ret);
1055 out_return_state:
1056         atomic_inc(&state->count);
1057         return state;
1058 }
1059
1060 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1061 {
1062         struct inode *inode;
1063         struct nfs4_state *state = NULL;
1064         struct nfs_delegation *delegation;
1065         int ret;
1066
1067         if (!data->rpc_done) {
1068                 state = nfs4_try_open_cached(data);
1069                 goto out;
1070         }
1071
1072         ret = -EAGAIN;
1073         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1074                 goto err;
1075         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1076         ret = PTR_ERR(inode);
1077         if (IS_ERR(inode))
1078                 goto err;
1079         ret = -ENOMEM;
1080         state = nfs4_get_open_state(inode, data->owner);
1081         if (state == NULL)
1082                 goto err_put_inode;
1083         if (data->o_res.delegation_type != 0) {
1084                 int delegation_flags = 0;
1085
1086                 rcu_read_lock();
1087                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1088                 if (delegation)
1089                         delegation_flags = delegation->flags;
1090                 rcu_read_unlock();
1091                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1092                         nfs_inode_set_delegation(state->inode,
1093                                         data->owner->so_cred,
1094                                         &data->o_res);
1095                 else
1096                         nfs_inode_reclaim_delegation(state->inode,
1097                                         data->owner->so_cred,
1098                                         &data->o_res);
1099         }
1100
1101         update_open_stateid(state, &data->o_res.stateid, NULL,
1102                         data->o_arg.fmode);
1103         iput(inode);
1104 out:
1105         return state;
1106 err_put_inode:
1107         iput(inode);
1108 err:
1109         return ERR_PTR(ret);
1110 }
1111
1112 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1113 {
1114         struct nfs_inode *nfsi = NFS_I(state->inode);
1115         struct nfs_open_context *ctx;
1116
1117         spin_lock(&state->inode->i_lock);
1118         list_for_each_entry(ctx, &nfsi->open_files, list) {
1119                 if (ctx->state != state)
1120                         continue;
1121                 get_nfs_open_context(ctx);
1122                 spin_unlock(&state->inode->i_lock);
1123                 return ctx;
1124         }
1125         spin_unlock(&state->inode->i_lock);
1126         return ERR_PTR(-ENOENT);
1127 }
1128
1129 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1130 {
1131         struct nfs4_opendata *opendata;
1132
1133         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1134         if (opendata == NULL)
1135                 return ERR_PTR(-ENOMEM);
1136         opendata->state = state;
1137         atomic_inc(&state->count);
1138         return opendata;
1139 }
1140
1141 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1142 {
1143         struct nfs4_state *newstate;
1144         int ret;
1145
1146         opendata->o_arg.open_flags = 0;
1147         opendata->o_arg.fmode = fmode;
1148         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1149         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1150         nfs4_init_opendata_res(opendata);
1151         ret = _nfs4_recover_proc_open(opendata);
1152         if (ret != 0)
1153                 return ret;
1154         newstate = nfs4_opendata_to_nfs4_state(opendata);
1155         if (IS_ERR(newstate))
1156                 return PTR_ERR(newstate);
1157         nfs4_close_state(&opendata->path, newstate, fmode);
1158         *res = newstate;
1159         return 0;
1160 }
1161
1162 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1163 {
1164         struct nfs4_state *newstate;
1165         int ret;
1166
1167         /* memory barrier prior to reading state->n_* */
1168         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1169         smp_rmb();
1170         if (state->n_rdwr != 0) {
1171                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1172                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1173                 if (ret != 0)
1174                         return ret;
1175                 if (newstate != state)
1176                         return -ESTALE;
1177         }
1178         if (state->n_wronly != 0) {
1179                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1180                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1181                 if (ret != 0)
1182                         return ret;
1183                 if (newstate != state)
1184                         return -ESTALE;
1185         }
1186         if (state->n_rdonly != 0) {
1187                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1188                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1189                 if (ret != 0)
1190                         return ret;
1191                 if (newstate != state)
1192                         return -ESTALE;
1193         }
1194         /*
1195          * We may have performed cached opens for all three recoveries.
1196          * Check if we need to update the current stateid.
1197          */
1198         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1199             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1200                 write_seqlock(&state->seqlock);
1201                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1202                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1203                 write_sequnlock(&state->seqlock);
1204         }
1205         return 0;
1206 }
1207
1208 /*
1209  * OPEN_RECLAIM:
1210  *      reclaim state on the server after a reboot.
1211  */
1212 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1213 {
1214         struct nfs_delegation *delegation;
1215         struct nfs4_opendata *opendata;
1216         fmode_t delegation_type = 0;
1217         int status;
1218
1219         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1220         if (IS_ERR(opendata))
1221                 return PTR_ERR(opendata);
1222         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1223         opendata->o_arg.fh = NFS_FH(state->inode);
1224         rcu_read_lock();
1225         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1226         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1227                 delegation_type = delegation->type;
1228         rcu_read_unlock();
1229         opendata->o_arg.u.delegation_type = delegation_type;
1230         status = nfs4_open_recover(opendata, state);
1231         nfs4_opendata_put(opendata);
1232         return status;
1233 }
1234
1235 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1236 {
1237         struct nfs_server *server = NFS_SERVER(state->inode);
1238         struct nfs4_exception exception = { };
1239         int err;
1240         do {
1241                 err = _nfs4_do_open_reclaim(ctx, state);
1242                 if (err != -NFS4ERR_DELAY)
1243                         break;
1244                 nfs4_handle_exception(server, err, &exception);
1245         } while (exception.retry);
1246         return err;
1247 }
1248
1249 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1250 {
1251         struct nfs_open_context *ctx;
1252         int ret;
1253
1254         ctx = nfs4_state_find_open_context(state);
1255         if (IS_ERR(ctx))
1256                 return PTR_ERR(ctx);
1257         ret = nfs4_do_open_reclaim(ctx, state);
1258         put_nfs_open_context(ctx);
1259         return ret;
1260 }
1261
1262 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1263 {
1264         struct nfs4_opendata *opendata;
1265         int ret;
1266
1267         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1268         if (IS_ERR(opendata))
1269                 return PTR_ERR(opendata);
1270         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1271         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1272                         sizeof(opendata->o_arg.u.delegation.data));
1273         ret = nfs4_open_recover(opendata, state);
1274         nfs4_opendata_put(opendata);
1275         return ret;
1276 }
1277
1278 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1279 {
1280         struct nfs4_exception exception = { };
1281         struct nfs_server *server = NFS_SERVER(state->inode);
1282         int err;
1283         do {
1284                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1285                 switch (err) {
1286                         case 0:
1287                         case -ENOENT:
1288                         case -ESTALE:
1289                                 goto out;
1290                         case -NFS4ERR_BADSESSION:
1291                         case -NFS4ERR_BADSLOT:
1292                         case -NFS4ERR_BAD_HIGH_SLOT:
1293                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1294                         case -NFS4ERR_DEADSESSION:
1295                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1296                                 goto out;
1297                         case -NFS4ERR_STALE_CLIENTID:
1298                         case -NFS4ERR_STALE_STATEID:
1299                         case -NFS4ERR_EXPIRED:
1300                                 /* Don't recall a delegation if it was lost */
1301                                 nfs4_schedule_lease_recovery(server->nfs_client);
1302                                 goto out;
1303                         case -ERESTARTSYS:
1304                                 /*
1305                                  * The show must go on: exit, but mark the
1306                                  * stateid as needing recovery.
1307                                  */
1308                         case -NFS4ERR_ADMIN_REVOKED:
1309                         case -NFS4ERR_BAD_STATEID:
1310                                 nfs4_schedule_stateid_recovery(server, state);
1311                         case -EKEYEXPIRED:
1312                                 /*
1313                                  * User RPCSEC_GSS context has expired.
1314                                  * We cannot recover this stateid now, so
1315                                  * skip it and allow recovery thread to
1316                                  * proceed.
1317                                  */
1318                         case -ENOMEM:
1319                                 err = 0;
1320                                 goto out;
1321                 }
1322                 err = nfs4_handle_exception(server, err, &exception);
1323         } while (exception.retry);
1324 out:
1325         return err;
1326 }
1327
1328 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1329 {
1330         struct nfs4_opendata *data = calldata;
1331
1332         data->rpc_status = task->tk_status;
1333         if (data->rpc_status == 0) {
1334                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1335                                 sizeof(data->o_res.stateid.data));
1336                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1337                 renew_lease(data->o_res.server, data->timestamp);
1338                 data->rpc_done = 1;
1339         }
1340 }
1341
1342 static void nfs4_open_confirm_release(void *calldata)
1343 {
1344         struct nfs4_opendata *data = calldata;
1345         struct nfs4_state *state = NULL;
1346
1347         /* If this request hasn't been cancelled, do nothing */
1348         if (data->cancelled == 0)
1349                 goto out_free;
1350         /* In case of error, no cleanup! */
1351         if (!data->rpc_done)
1352                 goto out_free;
1353         state = nfs4_opendata_to_nfs4_state(data);
1354         if (!IS_ERR(state))
1355                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1356 out_free:
1357         nfs4_opendata_put(data);
1358 }
1359
1360 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1361         .rpc_call_done = nfs4_open_confirm_done,
1362         .rpc_release = nfs4_open_confirm_release,
1363 };
1364
1365 /*
1366  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1367  */
1368 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1369 {
1370         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1371         struct rpc_task *task;
1372         struct  rpc_message msg = {
1373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1374                 .rpc_argp = &data->c_arg,
1375                 .rpc_resp = &data->c_res,
1376                 .rpc_cred = data->owner->so_cred,
1377         };
1378         struct rpc_task_setup task_setup_data = {
1379                 .rpc_client = server->client,
1380                 .rpc_message = &msg,
1381                 .callback_ops = &nfs4_open_confirm_ops,
1382                 .callback_data = data,
1383                 .workqueue = nfsiod_workqueue,
1384                 .flags = RPC_TASK_ASYNC,
1385         };
1386         int status;
1387
1388         kref_get(&data->kref);
1389         data->rpc_done = 0;
1390         data->rpc_status = 0;
1391         data->timestamp = jiffies;
1392         task = rpc_run_task(&task_setup_data);
1393         if (IS_ERR(task))
1394                 return PTR_ERR(task);
1395         status = nfs4_wait_for_completion_rpc_task(task);
1396         if (status != 0) {
1397                 data->cancelled = 1;
1398                 smp_wmb();
1399         } else
1400                 status = data->rpc_status;
1401         rpc_put_task(task);
1402         return status;
1403 }
1404
1405 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1406 {
1407         struct nfs4_opendata *data = calldata;
1408         struct nfs4_state_owner *sp = data->owner;
1409
1410         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1411                 return;
1412         /*
1413          * Check if we still need to send an OPEN call, or if we can use
1414          * a delegation instead.
1415          */
1416         if (data->state != NULL) {
1417                 struct nfs_delegation *delegation;
1418
1419                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1420                         goto out_no_action;
1421                 rcu_read_lock();
1422                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1423                 if (delegation != NULL &&
1424                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1425                         rcu_read_unlock();
1426                         goto out_no_action;
1427                 }
1428                 rcu_read_unlock();
1429         }
1430         /* Update sequence id. */
1431         data->o_arg.id = sp->so_owner_id.id;
1432         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1433         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1434                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1435                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1436         }
1437         data->timestamp = jiffies;
1438         if (nfs4_setup_sequence(data->o_arg.server,
1439                                 &data->o_arg.seq_args,
1440                                 &data->o_res.seq_res, 1, task))
1441                 return;
1442         rpc_call_start(task);
1443         return;
1444 out_no_action:
1445         task->tk_action = NULL;
1446
1447 }
1448
1449 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1450 {
1451         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1452         nfs4_open_prepare(task, calldata);
1453 }
1454
1455 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1456 {
1457         struct nfs4_opendata *data = calldata;
1458
1459         data->rpc_status = task->tk_status;
1460
1461         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1462                 return;
1463
1464         if (task->tk_status == 0) {
1465                 switch (data->o_res.f_attr->mode & S_IFMT) {
1466                         case S_IFREG:
1467                                 break;
1468                         case S_IFLNK:
1469                                 data->rpc_status = -ELOOP;
1470                                 break;
1471                         case S_IFDIR:
1472                                 data->rpc_status = -EISDIR;
1473                                 break;
1474                         default:
1475                                 data->rpc_status = -ENOTDIR;
1476                 }
1477                 renew_lease(data->o_res.server, data->timestamp);
1478                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1479                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1480         }
1481         data->rpc_done = 1;
1482 }
1483
1484 static void nfs4_open_release(void *calldata)
1485 {
1486         struct nfs4_opendata *data = calldata;
1487         struct nfs4_state *state = NULL;
1488
1489         /* If this request hasn't been cancelled, do nothing */
1490         if (data->cancelled == 0)
1491                 goto out_free;
1492         /* In case of error, no cleanup! */
1493         if (data->rpc_status != 0 || !data->rpc_done)
1494                 goto out_free;
1495         /* In case we need an open_confirm, no cleanup! */
1496         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1497                 goto out_free;
1498         state = nfs4_opendata_to_nfs4_state(data);
1499         if (!IS_ERR(state))
1500                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1501 out_free:
1502         nfs4_opendata_put(data);
1503 }
1504
1505 static const struct rpc_call_ops nfs4_open_ops = {
1506         .rpc_call_prepare = nfs4_open_prepare,
1507         .rpc_call_done = nfs4_open_done,
1508         .rpc_release = nfs4_open_release,
1509 };
1510
1511 static const struct rpc_call_ops nfs4_recover_open_ops = {
1512         .rpc_call_prepare = nfs4_recover_open_prepare,
1513         .rpc_call_done = nfs4_open_done,
1514         .rpc_release = nfs4_open_release,
1515 };
1516
1517 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1518 {
1519         struct inode *dir = data->dir->d_inode;
1520         struct nfs_server *server = NFS_SERVER(dir);
1521         struct nfs_openargs *o_arg = &data->o_arg;
1522         struct nfs_openres *o_res = &data->o_res;
1523         struct rpc_task *task;
1524         struct rpc_message msg = {
1525                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1526                 .rpc_argp = o_arg,
1527                 .rpc_resp = o_res,
1528                 .rpc_cred = data->owner->so_cred,
1529         };
1530         struct rpc_task_setup task_setup_data = {
1531                 .rpc_client = server->client,
1532                 .rpc_message = &msg,
1533                 .callback_ops = &nfs4_open_ops,
1534                 .callback_data = data,
1535                 .workqueue = nfsiod_workqueue,
1536                 .flags = RPC_TASK_ASYNC,
1537         };
1538         int status;
1539
1540         kref_get(&data->kref);
1541         data->rpc_done = 0;
1542         data->rpc_status = 0;
1543         data->cancelled = 0;
1544         if (isrecover)
1545                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1546         task = rpc_run_task(&task_setup_data);
1547         if (IS_ERR(task))
1548                 return PTR_ERR(task);
1549         status = nfs4_wait_for_completion_rpc_task(task);
1550         if (status != 0) {
1551                 data->cancelled = 1;
1552                 smp_wmb();
1553         } else
1554                 status = data->rpc_status;
1555         rpc_put_task(task);
1556
1557         return status;
1558 }
1559
1560 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1561 {
1562         struct inode *dir = data->dir->d_inode;
1563         struct nfs_openres *o_res = &data->o_res;
1564         int status;
1565
1566         status = nfs4_run_open_task(data, 1);
1567         if (status != 0 || !data->rpc_done)
1568                 return status;
1569
1570         nfs_refresh_inode(dir, o_res->dir_attr);
1571
1572         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1573                 status = _nfs4_proc_open_confirm(data);
1574                 if (status != 0)
1575                         return status;
1576         }
1577
1578         return status;
1579 }
1580
1581 /*
1582  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1583  */
1584 static int _nfs4_proc_open(struct nfs4_opendata *data)
1585 {
1586         struct inode *dir = data->dir->d_inode;
1587         struct nfs_server *server = NFS_SERVER(dir);
1588         struct nfs_openargs *o_arg = &data->o_arg;
1589         struct nfs_openres *o_res = &data->o_res;
1590         int status;
1591
1592         status = nfs4_run_open_task(data, 0);
1593         if (status != 0 || !data->rpc_done)
1594                 return status;
1595
1596         if (o_arg->open_flags & O_CREAT) {
1597                 update_changeattr(dir, &o_res->cinfo);
1598                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1599         } else
1600                 nfs_refresh_inode(dir, o_res->dir_attr);
1601         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1602                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1603         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1604                 status = _nfs4_proc_open_confirm(data);
1605                 if (status != 0)
1606                         return status;
1607         }
1608         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1609                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1610         return 0;
1611 }
1612
1613 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1614 {
1615         unsigned int loop;
1616         int ret;
1617
1618         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1619                 ret = nfs4_wait_clnt_recover(clp);
1620                 if (ret != 0)
1621                         break;
1622                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1623                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1624                         break;
1625                 nfs4_schedule_state_manager(clp);
1626                 ret = -EIO;
1627         }
1628         return ret;
1629 }
1630
1631 static int nfs4_recover_expired_lease(struct nfs_server *server)
1632 {
1633         return nfs4_client_recover_expired_lease(server->nfs_client);
1634 }
1635
1636 /*
1637  * OPEN_EXPIRED:
1638  *      reclaim state on the server after a network partition.
1639  *      Assumes caller holds the appropriate lock
1640  */
1641 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1642 {
1643         struct nfs4_opendata *opendata;
1644         int ret;
1645
1646         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1647         if (IS_ERR(opendata))
1648                 return PTR_ERR(opendata);
1649         ret = nfs4_open_recover(opendata, state);
1650         if (ret == -ESTALE)
1651                 d_drop(ctx->path.dentry);
1652         nfs4_opendata_put(opendata);
1653         return ret;
1654 }
1655
1656 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1657 {
1658         struct nfs_server *server = NFS_SERVER(state->inode);
1659         struct nfs4_exception exception = { };
1660         int err;
1661
1662         do {
1663                 err = _nfs4_open_expired(ctx, state);
1664                 switch (err) {
1665                 default:
1666                         goto out;
1667                 case -NFS4ERR_GRACE:
1668                 case -NFS4ERR_DELAY:
1669                         nfs4_handle_exception(server, err, &exception);
1670                         err = 0;
1671                 }
1672         } while (exception.retry);
1673 out:
1674         return err;
1675 }
1676
1677 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1678 {
1679         struct nfs_open_context *ctx;
1680         int ret;
1681
1682         ctx = nfs4_state_find_open_context(state);
1683         if (IS_ERR(ctx))
1684                 return PTR_ERR(ctx);
1685         ret = nfs4_do_open_expired(ctx, state);
1686         put_nfs_open_context(ctx);
1687         return ret;
1688 }
1689
1690 /*
1691  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1692  * fields corresponding to attributes that were used to store the verifier.
1693  * Make sure we clobber those fields in the later setattr call
1694  */
1695 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1696 {
1697         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1698             !(sattr->ia_valid & ATTR_ATIME_SET))
1699                 sattr->ia_valid |= ATTR_ATIME;
1700
1701         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1702             !(sattr->ia_valid & ATTR_MTIME_SET))
1703                 sattr->ia_valid |= ATTR_MTIME;
1704 }
1705
1706 /*
1707  * Returns a referenced nfs4_state
1708  */
1709 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1710 {
1711         struct nfs4_state_owner  *sp;
1712         struct nfs4_state     *state = NULL;
1713         struct nfs_server       *server = NFS_SERVER(dir);
1714         struct nfs4_opendata *opendata;
1715         int status;
1716
1717         /* Protect against reboot recovery conflicts */
1718         status = -ENOMEM;
1719         if (!(sp = nfs4_get_state_owner(server, cred))) {
1720                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1721                 goto out_err;
1722         }
1723         status = nfs4_recover_expired_lease(server);
1724         if (status != 0)
1725                 goto err_put_state_owner;
1726         if (path->dentry->d_inode != NULL)
1727                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1728         status = -ENOMEM;
1729         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1730         if (opendata == NULL)
1731                 goto err_put_state_owner;
1732
1733         if (path->dentry->d_inode != NULL)
1734                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1735
1736         status = _nfs4_proc_open(opendata);
1737         if (status != 0)
1738                 goto err_opendata_put;
1739
1740         state = nfs4_opendata_to_nfs4_state(opendata);
1741         status = PTR_ERR(state);
1742         if (IS_ERR(state))
1743                 goto err_opendata_put;
1744         if (server->caps & NFS_CAP_POSIX_LOCK)
1745                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1746
1747         if (opendata->o_arg.open_flags & O_EXCL) {
1748                 nfs4_exclusive_attrset(opendata, sattr);
1749
1750                 nfs_fattr_init(opendata->o_res.f_attr);
1751                 status = nfs4_do_setattr(state->inode, cred,
1752                                 opendata->o_res.f_attr, sattr,
1753                                 state);
1754                 if (status == 0)
1755                         nfs_setattr_update_inode(state->inode, sattr);
1756                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1757         }
1758         nfs4_opendata_put(opendata);
1759         nfs4_put_state_owner(sp);
1760         *res = state;
1761         return 0;
1762 err_opendata_put:
1763         nfs4_opendata_put(opendata);
1764 err_put_state_owner:
1765         nfs4_put_state_owner(sp);
1766 out_err:
1767         *res = NULL;
1768         return status;
1769 }
1770
1771
1772 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1773 {
1774         struct nfs4_exception exception = { };
1775         struct nfs4_state *res;
1776         int status;
1777
1778         do {
1779                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1780                 if (status == 0)
1781                         break;
1782                 /* NOTE: BAD_SEQID means the server and client disagree about the
1783                  * book-keeping w.r.t. state-changing operations
1784                  * (OPEN/CLOSE/LOCK/LOCKU...)
1785                  * It is actually a sign of a bug on the client or on the server.
1786                  *
1787                  * If we receive a BAD_SEQID error in the particular case of
1788                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1789                  * have unhashed the old state_owner for us, and that we can
1790                  * therefore safely retry using a new one. We should still warn
1791                  * the user though...
1792                  */
1793                 if (status == -NFS4ERR_BAD_SEQID) {
1794                         printk(KERN_WARNING "NFS: v4 server %s "
1795                                         " returned a bad sequence-id error!\n",
1796                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1797                         exception.retry = 1;
1798                         continue;
1799                 }
1800                 /*
1801                  * BAD_STATEID on OPEN means that the server cancelled our
1802                  * state before it received the OPEN_CONFIRM.
1803                  * Recover by retrying the request as per the discussion
1804                  * on Page 181 of RFC3530.
1805                  */
1806                 if (status == -NFS4ERR_BAD_STATEID) {
1807                         exception.retry = 1;
1808                         continue;
1809                 }
1810                 if (status == -EAGAIN) {
1811                         /* We must have found a delegation */
1812                         exception.retry = 1;
1813                         continue;
1814                 }
1815                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1816                                         status, &exception));
1817         } while (exception.retry);
1818         return res;
1819 }
1820
1821 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1822                             struct nfs_fattr *fattr, struct iattr *sattr,
1823                             struct nfs4_state *state)
1824 {
1825         struct nfs_server *server = NFS_SERVER(inode);
1826         struct nfs_setattrargs  arg = {
1827                 .fh             = NFS_FH(inode),
1828                 .iap            = sattr,
1829                 .server         = server,
1830                 .bitmask = server->attr_bitmask,
1831         };
1832         struct nfs_setattrres  res = {
1833                 .fattr          = fattr,
1834                 .server         = server,
1835         };
1836         struct rpc_message msg = {
1837                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1838                 .rpc_argp       = &arg,
1839                 .rpc_resp       = &res,
1840                 .rpc_cred       = cred,
1841         };
1842         unsigned long timestamp = jiffies;
1843         int status;
1844
1845         nfs_fattr_init(fattr);
1846
1847         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1848                 /* Use that stateid */
1849         } else if (state != NULL) {
1850                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1851         } else
1852                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1853
1854         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1855         if (status == 0 && state != NULL)
1856                 renew_lease(server, timestamp);
1857         return status;
1858 }
1859
1860 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1861                            struct nfs_fattr *fattr, struct iattr *sattr,
1862                            struct nfs4_state *state)
1863 {
1864         struct nfs_server *server = NFS_SERVER(inode);
1865         struct nfs4_exception exception = { };
1866         int err;
1867         do {
1868                 err = nfs4_handle_exception(server,
1869                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1870                                 &exception);
1871         } while (exception.retry);
1872         return err;
1873 }
1874
1875 struct nfs4_closedata {
1876         struct path path;
1877         struct inode *inode;
1878         struct nfs4_state *state;
1879         struct nfs_closeargs arg;
1880         struct nfs_closeres res;
1881         struct nfs_fattr fattr;
1882         unsigned long timestamp;
1883         bool roc;
1884         u32 roc_barrier;
1885 };
1886
1887 static void nfs4_free_closedata(void *data)
1888 {
1889         struct nfs4_closedata *calldata = data;
1890         struct nfs4_state_owner *sp = calldata->state->owner;
1891
1892         if (calldata->roc)
1893                 pnfs_roc_release(calldata->state->inode);
1894         nfs4_put_open_state(calldata->state);
1895         nfs_free_seqid(calldata->arg.seqid);
1896         nfs4_put_state_owner(sp);
1897         path_put(&calldata->path);
1898         kfree(calldata);
1899 }
1900
1901 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1902                 fmode_t fmode)
1903 {
1904         spin_lock(&state->owner->so_lock);
1905         if (!(fmode & FMODE_READ))
1906                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1907         if (!(fmode & FMODE_WRITE))
1908                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1909         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1910         spin_unlock(&state->owner->so_lock);
1911 }
1912
1913 static void nfs4_close_done(struct rpc_task *task, void *data)
1914 {
1915         struct nfs4_closedata *calldata = data;
1916         struct nfs4_state *state = calldata->state;
1917         struct nfs_server *server = NFS_SERVER(calldata->inode);
1918
1919         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1920                 return;
1921         /* hmm. we are done with the inode, and in the process of freeing
1922          * the state_owner. we keep this around to process errors
1923          */
1924         switch (task->tk_status) {
1925                 case 0:
1926                         if (calldata->roc)
1927                                 pnfs_roc_set_barrier(state->inode,
1928                                                      calldata->roc_barrier);
1929                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1930                         renew_lease(server, calldata->timestamp);
1931                         nfs4_close_clear_stateid_flags(state,
1932                                         calldata->arg.fmode);
1933                         break;
1934                 case -NFS4ERR_STALE_STATEID:
1935                 case -NFS4ERR_OLD_STATEID:
1936                 case -NFS4ERR_BAD_STATEID:
1937                 case -NFS4ERR_EXPIRED:
1938                         if (calldata->arg.fmode == 0)
1939                                 break;
1940                 default:
1941                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1942                                 rpc_restart_call_prepare(task);
1943         }
1944         nfs_release_seqid(calldata->arg.seqid);
1945         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1946 }
1947
1948 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1949 {
1950         struct nfs4_closedata *calldata = data;
1951         struct nfs4_state *state = calldata->state;
1952         int call_close = 0;
1953
1954         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1955                 return;
1956
1957         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1958         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1959         spin_lock(&state->owner->so_lock);
1960         /* Calculate the change in open mode */
1961         if (state->n_rdwr == 0) {
1962                 if (state->n_rdonly == 0) {
1963                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1964                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1965                         calldata->arg.fmode &= ~FMODE_READ;
1966                 }
1967                 if (state->n_wronly == 0) {
1968                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1969                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1970                         calldata->arg.fmode &= ~FMODE_WRITE;
1971                 }
1972         }
1973         spin_unlock(&state->owner->so_lock);
1974
1975         if (!call_close) {
1976                 /* Note: exit _without_ calling nfs4_close_done */
1977                 task->tk_action = NULL;
1978                 return;
1979         }
1980
1981         if (calldata->arg.fmode == 0) {
1982                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1983                 if (calldata->roc &&
1984                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1985                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1986                                      task, NULL);
1987                         return;
1988                 }
1989         }
1990
1991         nfs_fattr_init(calldata->res.fattr);
1992         calldata->timestamp = jiffies;
1993         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1994                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1995                                 1, task))
1996                 return;
1997         rpc_call_start(task);
1998 }
1999
2000 static const struct rpc_call_ops nfs4_close_ops = {
2001         .rpc_call_prepare = nfs4_close_prepare,
2002         .rpc_call_done = nfs4_close_done,
2003         .rpc_release = nfs4_free_closedata,
2004 };
2005
2006 /*
2007  * It is possible for data to be read/written from a mem-mapped file
2008  * after the sys_close call (which hits the vfs layer as a flush).
2009  * This means that we can't safely call nfsv4 close on a file until
2010  * the inode is cleared. This in turn means that we are not good
2011  * NFSv4 citizens - we do not indicate to the server to update the file's
2012  * share state even when we are done with one of the three share
2013  * stateid's in the inode.
2014  *
2015  * NOTE: Caller must be holding the sp->so_owner semaphore!
2016  */
2017 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2018 {
2019         struct nfs_server *server = NFS_SERVER(state->inode);
2020         struct nfs4_closedata *calldata;
2021         struct nfs4_state_owner *sp = state->owner;
2022         struct rpc_task *task;
2023         struct rpc_message msg = {
2024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2025                 .rpc_cred = state->owner->so_cred,
2026         };
2027         struct rpc_task_setup task_setup_data = {
2028                 .rpc_client = server->client,
2029                 .rpc_message = &msg,
2030                 .callback_ops = &nfs4_close_ops,
2031                 .workqueue = nfsiod_workqueue,
2032                 .flags = RPC_TASK_ASYNC,
2033         };
2034         int status = -ENOMEM;
2035
2036         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2037         if (calldata == NULL)
2038                 goto out;
2039         calldata->inode = state->inode;
2040         calldata->state = state;
2041         calldata->arg.fh = NFS_FH(state->inode);
2042         calldata->arg.stateid = &state->open_stateid;
2043         /* Serialization for the sequence id */
2044         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2045         if (calldata->arg.seqid == NULL)
2046                 goto out_free_calldata;
2047         calldata->arg.fmode = 0;
2048         calldata->arg.bitmask = server->cache_consistency_bitmask;
2049         calldata->res.fattr = &calldata->fattr;
2050         calldata->res.seqid = calldata->arg.seqid;
2051         calldata->res.server = server;
2052         calldata->roc = roc;
2053         path_get(path);
2054         calldata->path = *path;
2055
2056         msg.rpc_argp = &calldata->arg;
2057         msg.rpc_resp = &calldata->res;
2058         task_setup_data.callback_data = calldata;
2059         task = rpc_run_task(&task_setup_data);
2060         if (IS_ERR(task))
2061                 return PTR_ERR(task);
2062         status = 0;
2063         if (wait)
2064                 status = rpc_wait_for_completion_task(task);
2065         rpc_put_task(task);
2066         return status;
2067 out_free_calldata:
2068         kfree(calldata);
2069 out:
2070         if (roc)
2071                 pnfs_roc_release(state->inode);
2072         nfs4_put_open_state(state);
2073         nfs4_put_state_owner(sp);
2074         return status;
2075 }
2076
2077 static struct inode *
2078 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2079 {
2080         struct nfs4_state *state;
2081
2082         /* Protect against concurrent sillydeletes */
2083         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2084         if (IS_ERR(state))
2085                 return ERR_CAST(state);
2086         ctx->state = state;
2087         return igrab(state->inode);
2088 }
2089
2090 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2091 {
2092         if (ctx->state == NULL)
2093                 return;
2094         if (is_sync)
2095                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2096         else
2097                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2098 }
2099
2100 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2101 {
2102         struct nfs4_server_caps_arg args = {
2103                 .fhandle = fhandle,
2104         };
2105         struct nfs4_server_caps_res res = {};
2106         struct rpc_message msg = {
2107                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2108                 .rpc_argp = &args,
2109                 .rpc_resp = &res,
2110         };
2111         int status;
2112
2113         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2114         if (status == 0) {
2115                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2116                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2117                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2118                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2119                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2120                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2121                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2122                         server->caps |= NFS_CAP_ACLS;
2123                 if (res.has_links != 0)
2124                         server->caps |= NFS_CAP_HARDLINKS;
2125                 if (res.has_symlinks != 0)
2126                         server->caps |= NFS_CAP_SYMLINKS;
2127                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2128                         server->caps |= NFS_CAP_FILEID;
2129                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2130                         server->caps |= NFS_CAP_MODE;
2131                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2132                         server->caps |= NFS_CAP_NLINK;
2133                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2134                         server->caps |= NFS_CAP_OWNER;
2135                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2136                         server->caps |= NFS_CAP_OWNER_GROUP;
2137                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2138                         server->caps |= NFS_CAP_ATIME;
2139                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2140                         server->caps |= NFS_CAP_CTIME;
2141                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2142                         server->caps |= NFS_CAP_MTIME;
2143
2144                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2145                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2146                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2147                 server->acl_bitmask = res.acl_bitmask;
2148         }
2149
2150         return status;
2151 }
2152
2153 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2154 {
2155         struct nfs4_exception exception = { };
2156         int err;
2157         do {
2158                 err = nfs4_handle_exception(server,
2159                                 _nfs4_server_capabilities(server, fhandle),
2160                                 &exception);
2161         } while (exception.retry);
2162         return err;
2163 }
2164
2165 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2166                 struct nfs_fsinfo *info)
2167 {
2168         struct nfs4_lookup_root_arg args = {
2169                 .bitmask = nfs4_fattr_bitmap,
2170         };
2171         struct nfs4_lookup_res res = {
2172                 .server = server,
2173                 .fattr = info->fattr,
2174                 .fh = fhandle,
2175         };
2176         struct rpc_message msg = {
2177                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2178                 .rpc_argp = &args,
2179                 .rpc_resp = &res,
2180         };
2181
2182         nfs_fattr_init(info->fattr);
2183         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2184 }
2185
2186 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2187                 struct nfs_fsinfo *info)
2188 {
2189         struct nfs4_exception exception = { };
2190         int err;
2191         do {
2192                 err = _nfs4_lookup_root(server, fhandle, info);
2193                 switch (err) {
2194                 case 0:
2195                 case -NFS4ERR_WRONGSEC:
2196                         break;
2197                 default:
2198                         err = nfs4_handle_exception(server, err, &exception);
2199                 }
2200         } while (exception.retry);
2201         return err;
2202 }
2203
2204 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2205                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2206 {
2207         struct rpc_auth *auth;
2208         int ret;
2209
2210         auth = rpcauth_create(flavor, server->client);
2211         if (!auth) {
2212                 ret = -EIO;
2213                 goto out;
2214         }
2215         ret = nfs4_lookup_root(server, fhandle, info);
2216 out:
2217         return ret;
2218 }
2219
2220 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2221                               struct nfs_fsinfo *info)
2222 {
2223         int i, len, status = 0;
2224         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2225
2226         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2227         flav_array[len] = RPC_AUTH_NULL;
2228         len += 1;
2229
2230         for (i = 0; i < len; i++) {
2231                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2232                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2233                         continue;
2234                 break;
2235         }
2236         /*
2237          * -EACCESS could mean that the user doesn't have correct permissions
2238          * to access the mount.  It could also mean that we tried to mount
2239          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2240          * existing mount programs don't handle -EACCES very well so it should
2241          * be mapped to -EPERM instead.
2242          */
2243         if (status == -EACCES)
2244                 status = -EPERM;
2245         return status;
2246 }
2247
2248 /*
2249  * get the file handle for the "/" directory on the server
2250  */
2251 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2252                               struct nfs_fsinfo *info)
2253 {
2254         int status = nfs4_lookup_root(server, fhandle, info);
2255         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2256                 /*
2257                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2258                  * by nfs4_map_errors() as this function exits.
2259                  */
2260                 status = nfs4_find_root_sec(server, fhandle, info);
2261         if (status == 0)
2262                 status = nfs4_server_capabilities(server, fhandle);
2263         if (status == 0)
2264                 status = nfs4_do_fsinfo(server, fhandle, info);
2265         return nfs4_map_errors(status);
2266 }
2267
2268 /*
2269  * Get locations and (maybe) other attributes of a referral.
2270  * Note that we'll actually follow the referral later when
2271  * we detect fsid mismatch in inode revalidation
2272  */
2273 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2274 {
2275         int status = -ENOMEM;
2276         struct page *page = NULL;
2277         struct nfs4_fs_locations *locations = NULL;
2278
2279         page = alloc_page(GFP_KERNEL);
2280         if (page == NULL)
2281                 goto out;
2282         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2283         if (locations == NULL)
2284                 goto out;
2285
2286         status = nfs4_proc_fs_locations(dir, name, locations, page);
2287         if (status != 0)
2288                 goto out;
2289         /* Make sure server returned a different fsid for the referral */
2290         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2291                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2292                 status = -EIO;
2293                 goto out;
2294         }
2295
2296         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2297         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2298         if (!fattr->mode)
2299                 fattr->mode = S_IFDIR;
2300         memset(fhandle, 0, sizeof(struct nfs_fh));
2301 out:
2302         if (page)
2303                 __free_page(page);
2304         kfree(locations);
2305         return status;
2306 }
2307
2308 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2309 {
2310         struct nfs4_getattr_arg args = {
2311                 .fh = fhandle,
2312                 .bitmask = server->attr_bitmask,
2313         };
2314         struct nfs4_getattr_res res = {
2315                 .fattr = fattr,
2316                 .server = server,
2317         };
2318         struct rpc_message msg = {
2319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2320                 .rpc_argp = &args,
2321                 .rpc_resp = &res,
2322         };
2323
2324         nfs_fattr_init(fattr);
2325         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2326 }
2327
2328 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2329 {
2330         struct nfs4_exception exception = { };
2331         int err;
2332         do {
2333                 err = nfs4_handle_exception(server,
2334                                 _nfs4_proc_getattr(server, fhandle, fattr),
2335                                 &exception);
2336         } while (exception.retry);
2337         return err;
2338 }
2339
2340 /*
2341  * The file is not closed if it is opened due to the a request to change
2342  * the size of the file. The open call will not be needed once the
2343  * VFS layer lookup-intents are implemented.
2344  *
2345  * Close is called when the inode is destroyed.
2346  * If we haven't opened the file for O_WRONLY, we
2347  * need to in the size_change case to obtain a stateid.
2348  *
2349  * Got race?
2350  * Because OPEN is always done by name in nfsv4, it is
2351  * possible that we opened a different file by the same
2352  * name.  We can recognize this race condition, but we
2353  * can't do anything about it besides returning an error.
2354  *
2355  * This will be fixed with VFS changes (lookup-intent).
2356  */
2357 static int
2358 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2359                   struct iattr *sattr)
2360 {
2361         struct inode *inode = dentry->d_inode;
2362         struct rpc_cred *cred = NULL;
2363         struct nfs4_state *state = NULL;
2364         int status;
2365
2366         if (pnfs_ld_layoutret_on_setattr(inode))
2367                 pnfs_return_layout(inode);
2368
2369         nfs_fattr_init(fattr);
2370
2371         /* Search for an existing open(O_WRITE) file */
2372         if (sattr->ia_valid & ATTR_FILE) {
2373                 struct nfs_open_context *ctx;
2374
2375                 ctx = nfs_file_open_context(sattr->ia_file);
2376                 if (ctx) {
2377                         cred = ctx->cred;
2378                         state = ctx->state;
2379                 }
2380         }
2381
2382         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2383         if (status == 0)
2384                 nfs_setattr_update_inode(inode, sattr);
2385         return status;
2386 }
2387
2388 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2389                 const struct nfs_fh *dirfh, const struct qstr *name,
2390                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2391 {
2392         int                    status;
2393         struct nfs4_lookup_arg args = {
2394                 .bitmask = server->attr_bitmask,
2395                 .dir_fh = dirfh,
2396                 .name = name,
2397         };
2398         struct nfs4_lookup_res res = {
2399                 .server = server,
2400                 .fattr = fattr,
2401                 .fh = fhandle,
2402         };
2403         struct rpc_message msg = {
2404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2405                 .rpc_argp = &args,
2406                 .rpc_resp = &res,
2407         };
2408
2409         nfs_fattr_init(fattr);
2410
2411         dprintk("NFS call  lookupfh %s\n", name->name);
2412         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2413         dprintk("NFS reply lookupfh: %d\n", status);
2414         return status;
2415 }
2416
2417 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2418                               struct qstr *name, struct nfs_fh *fhandle,
2419                               struct nfs_fattr *fattr)
2420 {
2421         struct nfs4_exception exception = { };
2422         int err;
2423         do {
2424                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2425                 /* FIXME: !!!! */
2426                 if (err == -NFS4ERR_MOVED) {
2427                         err = -EREMOTE;
2428                         break;
2429                 }
2430                 err = nfs4_handle_exception(server, err, &exception);
2431         } while (exception.retry);
2432         return err;
2433 }
2434
2435 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2436                 const struct qstr *name, struct nfs_fh *fhandle,
2437                 struct nfs_fattr *fattr)
2438 {
2439         int status;
2440
2441         dprintk("NFS call  lookup %s\n", name->name);
2442         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2443         if (status == -NFS4ERR_MOVED)
2444                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2445         dprintk("NFS reply lookup: %d\n", status);
2446         return status;
2447 }
2448
2449 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2450 {
2451         memset(fh, 0, sizeof(struct nfs_fh));
2452         fattr->fsid.major = 1;
2453         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2454                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2455         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2456         fattr->nlink = 2;
2457 }
2458
2459 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2460                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2461 {
2462         struct nfs4_exception exception = { };
2463         int err;
2464         do {
2465                 err = nfs4_handle_exception(NFS_SERVER(dir),
2466                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2467                                 &exception);
2468                 if (err == -EPERM)
2469                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2470         } while (exception.retry);
2471         return err;
2472 }
2473
2474 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2475 {
2476         struct nfs_server *server = NFS_SERVER(inode);
2477         struct nfs4_accessargs args = {
2478                 .fh = NFS_FH(inode),
2479                 .bitmask = server->attr_bitmask,
2480         };
2481         struct nfs4_accessres res = {
2482                 .server = server,
2483         };
2484         struct rpc_message msg = {
2485                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2486                 .rpc_argp = &args,
2487                 .rpc_resp = &res,
2488                 .rpc_cred = entry->cred,
2489         };
2490         int mode = entry->mask;
2491         int status;
2492
2493         /*
2494          * Determine which access bits we want to ask for...
2495          */
2496         if (mode & MAY_READ)
2497                 args.access |= NFS4_ACCESS_READ;
2498         if (S_ISDIR(inode->i_mode)) {
2499                 if (mode & MAY_WRITE)
2500                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2501                 if (mode & MAY_EXEC)
2502                         args.access |= NFS4_ACCESS_LOOKUP;
2503         } else {
2504                 if (mode & MAY_WRITE)
2505                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2506                 if (mode & MAY_EXEC)
2507                         args.access |= NFS4_ACCESS_EXECUTE;
2508         }
2509
2510         res.fattr = nfs_alloc_fattr();
2511         if (res.fattr == NULL)
2512                 return -ENOMEM;
2513
2514         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2515         if (!status) {
2516                 entry->mask = 0;
2517                 if (res.access & NFS4_ACCESS_READ)
2518                         entry->mask |= MAY_READ;
2519                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2520                         entry->mask |= MAY_WRITE;
2521                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2522                         entry->mask |= MAY_EXEC;
2523                 nfs_refresh_inode(inode, res.fattr);
2524         }
2525         nfs_free_fattr(res.fattr);
2526         return status;
2527 }
2528
2529 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2530 {
2531         struct nfs4_exception exception = { };
2532         int err;
2533         do {
2534                 err = nfs4_handle_exception(NFS_SERVER(inode),
2535                                 _nfs4_proc_access(inode, entry),
2536                                 &exception);
2537         } while (exception.retry);
2538         return err;
2539 }
2540
2541 /*
2542  * TODO: For the time being, we don't try to get any attributes
2543  * along with any of the zero-copy operations READ, READDIR,
2544  * READLINK, WRITE.
2545  *
2546  * In the case of the first three, we want to put the GETATTR
2547  * after the read-type operation -- this is because it is hard
2548  * to predict the length of a GETATTR response in v4, and thus
2549  * align the READ data correctly.  This means that the GETATTR
2550  * may end up partially falling into the page cache, and we should
2551  * shift it into the 'tail' of the xdr_buf before processing.
2552  * To do this efficiently, we need to know the total length
2553  * of data received, which doesn't seem to be available outside
2554  * of the RPC layer.
2555  *
2556  * In the case of WRITE, we also want to put the GETATTR after
2557  * the operation -- in this case because we want to make sure
2558  * we get the post-operation mtime and size.  This means that
2559  * we can't use xdr_encode_pages() as written: we need a variant
2560  * of it which would leave room in the 'tail' iovec.
2561  *
2562  * Both of these changes to the XDR layer would in fact be quite
2563  * minor, but I decided to leave them for a subsequent patch.
2564  */
2565 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2566                 unsigned int pgbase, unsigned int pglen)
2567 {
2568         struct nfs4_readlink args = {
2569                 .fh       = NFS_FH(inode),
2570                 .pgbase   = pgbase,
2571                 .pglen    = pglen,
2572                 .pages    = &page,
2573         };
2574         struct nfs4_readlink_res res;
2575         struct rpc_message msg = {
2576                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2577                 .rpc_argp = &args,
2578                 .rpc_resp = &res,
2579         };
2580
2581         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2582 }
2583
2584 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2585                 unsigned int pgbase, unsigned int pglen)
2586 {
2587         struct nfs4_exception exception = { };
2588         int err;
2589         do {
2590                 err = nfs4_handle_exception(NFS_SERVER(inode),
2591                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2592                                 &exception);
2593         } while (exception.retry);
2594         return err;
2595 }
2596
2597 /*
2598  * Got race?
2599  * We will need to arrange for the VFS layer to provide an atomic open.
2600  * Until then, this create/open method is prone to inefficiency and race
2601  * conditions due to the lookup, create, and open VFS calls from sys_open()
2602  * placed on the wire.
2603  *
2604  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2605  * The file will be opened again in the subsequent VFS open call
2606  * (nfs4_proc_file_open).
2607  *
2608  * The open for read will just hang around to be used by any process that
2609  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2610  */
2611
2612 static int
2613 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2614                  int flags, struct nfs_open_context *ctx)
2615 {
2616         struct path my_path = {
2617                 .dentry = dentry,
2618         };
2619         struct path *path = &my_path;
2620         struct nfs4_state *state;
2621         struct rpc_cred *cred = NULL;
2622         fmode_t fmode = 0;
2623         int status = 0;
2624
2625         if (ctx != NULL) {
2626                 cred = ctx->cred;
2627                 path = &ctx->path;
2628                 fmode = ctx->mode;
2629         }
2630         sattr->ia_mode &= ~current_umask();
2631         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2632         d_drop(dentry);
2633         if (IS_ERR(state)) {
2634                 status = PTR_ERR(state);
2635                 goto out;
2636         }
2637         d_add(dentry, igrab(state->inode));
2638         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2639         if (ctx != NULL)
2640                 ctx->state = state;
2641         else
2642                 nfs4_close_sync(path, state, fmode);
2643 out:
2644         return status;
2645 }
2646
2647 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2648 {
2649         struct nfs_server *server = NFS_SERVER(dir);
2650         struct nfs_removeargs args = {
2651                 .fh = NFS_FH(dir),
2652                 .name.len = name->len,
2653                 .name.name = name->name,
2654                 .bitmask = server->attr_bitmask,
2655         };
2656         struct nfs_removeres res = {
2657                 .server = server,
2658         };
2659         struct rpc_message msg = {
2660                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2661                 .rpc_argp = &args,
2662                 .rpc_resp = &res,
2663         };
2664         int status = -ENOMEM;
2665
2666         res.dir_attr = nfs_alloc_fattr();
2667         if (res.dir_attr == NULL)
2668                 goto out;
2669
2670         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2671         if (status == 0) {
2672                 update_changeattr(dir, &res.cinfo);
2673                 nfs_post_op_update_inode(dir, res.dir_attr);
2674         }
2675         nfs_free_fattr(res.dir_attr);
2676 out:
2677         return status;
2678 }
2679
2680 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2681 {
2682         struct nfs4_exception exception = { };
2683         int err;
2684         do {
2685                 err = nfs4_handle_exception(NFS_SERVER(dir),
2686                                 _nfs4_proc_remove(dir, name),
2687                                 &exception);
2688         } while (exception.retry);
2689         return err;
2690 }
2691
2692 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2693 {
2694         struct nfs_server *server = NFS_SERVER(dir);
2695         struct nfs_removeargs *args = msg->rpc_argp;
2696         struct nfs_removeres *res = msg->rpc_resp;
2697
2698         args->bitmask = server->cache_consistency_bitmask;
2699         res->server = server;
2700         res->seq_res.sr_slot = NULL;
2701         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2702 }
2703
2704 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2705 {
2706         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2707
2708         if (!nfs4_sequence_done(task, &res->seq_res))
2709                 return 0;
2710         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2711                 return 0;
2712         update_changeattr(dir, &res->cinfo);
2713         nfs_post_op_update_inode(dir, res->dir_attr);
2714         return 1;
2715 }
2716
2717 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2718 {
2719         struct nfs_server *server = NFS_SERVER(dir);
2720         struct nfs_renameargs *arg = msg->rpc_argp;
2721         struct nfs_renameres *res = msg->rpc_resp;
2722
2723         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2724         arg->bitmask = server->attr_bitmask;
2725         res->server = server;
2726 }
2727
2728 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2729                                  struct inode *new_dir)
2730 {
2731         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2732
2733         if (!nfs4_sequence_done(task, &res->seq_res))
2734                 return 0;
2735         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2736                 return 0;
2737
2738         update_changeattr(old_dir, &res->old_cinfo);
2739         nfs_post_op_update_inode(old_dir, res->old_fattr);
2740         update_changeattr(new_dir, &res->new_cinfo);
2741         nfs_post_op_update_inode(new_dir, res->new_fattr);
2742         return 1;
2743 }
2744
2745 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2746                 struct inode *new_dir, struct qstr *new_name)
2747 {
2748         struct nfs_server *server = NFS_SERVER(old_dir);
2749         struct nfs_renameargs arg = {
2750                 .old_dir = NFS_FH(old_dir),
2751                 .new_dir = NFS_FH(new_dir),
2752                 .old_name = old_name,
2753                 .new_name = new_name,
2754                 .bitmask = server->attr_bitmask,
2755         };
2756         struct nfs_renameres res = {
2757                 .server = server,
2758         };
2759         struct rpc_message msg = {
2760                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2761                 .rpc_argp = &arg,
2762                 .rpc_resp = &res,
2763         };
2764         int status = -ENOMEM;
2765
2766         res.old_fattr = nfs_alloc_fattr();
2767         res.new_fattr = nfs_alloc_fattr();
2768         if (res.old_fattr == NULL || res.new_fattr == NULL)
2769                 goto out;
2770
2771         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2772         if (!status) {
2773                 update_changeattr(old_dir, &res.old_cinfo);
2774                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2775                 update_changeattr(new_dir, &res.new_cinfo);
2776                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2777         }
2778 out:
2779         nfs_free_fattr(res.new_fattr);
2780         nfs_free_fattr(res.old_fattr);
2781         return status;
2782 }
2783
2784 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2785                 struct inode *new_dir, struct qstr *new_name)
2786 {
2787         struct nfs4_exception exception = { };
2788         int err;
2789         do {
2790                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2791                                 _nfs4_proc_rename(old_dir, old_name,
2792                                         new_dir, new_name),
2793                                 &exception);
2794         } while (exception.retry);
2795         return err;
2796 }
2797
2798 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2799 {
2800         struct nfs_server *server = NFS_SERVER(inode);
2801         struct nfs4_link_arg arg = {
2802                 .fh     = NFS_FH(inode),
2803                 .dir_fh = NFS_FH(dir),
2804                 .name   = name,
2805                 .bitmask = server->attr_bitmask,
2806         };
2807         struct nfs4_link_res res = {
2808                 .server = server,
2809         };
2810         struct rpc_message msg = {
2811                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2812                 .rpc_argp = &arg,
2813                 .rpc_resp = &res,
2814         };
2815         int status = -ENOMEM;
2816
2817         res.fattr = nfs_alloc_fattr();
2818         res.dir_attr = nfs_alloc_fattr();
2819         if (res.fattr == NULL || res.dir_attr == NULL)
2820                 goto out;
2821
2822         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2823         if (!status) {
2824                 update_changeattr(dir, &res.cinfo);
2825                 nfs_post_op_update_inode(dir, res.dir_attr);
2826                 nfs_post_op_update_inode(inode, res.fattr);
2827         }
2828 out:
2829         nfs_free_fattr(res.dir_attr);
2830         nfs_free_fattr(res.fattr);
2831         return status;
2832 }
2833
2834 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2835 {
2836         struct nfs4_exception exception = { };
2837         int err;
2838         do {
2839                 err = nfs4_handle_exception(NFS_SERVER(inode),
2840                                 _nfs4_proc_link(inode, dir, name),
2841                                 &exception);
2842         } while (exception.retry);
2843         return err;
2844 }
2845
2846 struct nfs4_createdata {
2847         struct rpc_message msg;
2848         struct nfs4_create_arg arg;
2849         struct nfs4_create_res res;
2850         struct nfs_fh fh;
2851         struct nfs_fattr fattr;
2852         struct nfs_fattr dir_fattr;
2853 };
2854
2855 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2856                 struct qstr *name, struct iattr *sattr, u32 ftype)
2857 {
2858         struct nfs4_createdata *data;
2859
2860         data = kzalloc(sizeof(*data), GFP_KERNEL);
2861         if (data != NULL) {
2862                 struct nfs_server *server = NFS_SERVER(dir);
2863
2864                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2865                 data->msg.rpc_argp = &data->arg;
2866                 data->msg.rpc_resp = &data->res;
2867                 data->arg.dir_fh = NFS_FH(dir);
2868                 data->arg.server = server;
2869                 data->arg.name = name;
2870                 data->arg.attrs = sattr;
2871                 data->arg.ftype = ftype;
2872                 data->arg.bitmask = server->attr_bitmask;
2873                 data->res.server = server;
2874                 data->res.fh = &data->fh;
2875                 data->res.fattr = &data->fattr;
2876                 data->res.dir_fattr = &data->dir_fattr;
2877                 nfs_fattr_init(data->res.fattr);
2878                 nfs_fattr_init(data->res.dir_fattr);
2879         }
2880         return data;
2881 }
2882
2883 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2884 {
2885         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2886                                     &data->arg.seq_args, &data->res.seq_res, 1);
2887         if (status == 0) {
2888                 update_changeattr(dir, &data->res.dir_cinfo);
2889                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2890                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2891         }
2892         return status;
2893 }
2894
2895 static void nfs4_free_createdata(struct nfs4_createdata *data)
2896 {
2897         kfree(data);
2898 }
2899
2900 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2901                 struct page *page, unsigned int len, struct iattr *sattr)
2902 {
2903         struct nfs4_createdata *data;
2904         int status = -ENAMETOOLONG;
2905
2906         if (len > NFS4_MAXPATHLEN)
2907                 goto out;
2908
2909         status = -ENOMEM;
2910         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2911         if (data == NULL)
2912                 goto out;
2913
2914         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2915         data->arg.u.symlink.pages = &page;
2916         data->arg.u.symlink.len = len;
2917
2918         status = nfs4_do_create(dir, dentry, data);
2919
2920         nfs4_free_createdata(data);
2921 out:
2922         return status;
2923 }
2924
2925 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2926                 struct page *page, unsigned int len, struct iattr *sattr)
2927 {
2928         struct nfs4_exception exception = { };
2929         int err;
2930         do {
2931                 err = nfs4_handle_exception(NFS_SERVER(dir),
2932                                 _nfs4_proc_symlink(dir, dentry, page,
2933                                                         len, sattr),
2934                                 &exception);
2935         } while (exception.retry);
2936         return err;
2937 }
2938
2939 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2940                 struct iattr *sattr)
2941 {
2942         struct nfs4_createdata *data;
2943         int status = -ENOMEM;
2944
2945         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2946         if (data == NULL)
2947                 goto out;
2948
2949         status = nfs4_do_create(dir, dentry, data);
2950
2951         nfs4_free_createdata(data);
2952 out:
2953         return status;
2954 }
2955
2956 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2957                 struct iattr *sattr)
2958 {
2959         struct nfs4_exception exception = { };
2960         int err;
2961
2962         sattr->ia_mode &= ~current_umask();
2963         do {
2964                 err = nfs4_handle_exception(NFS_SERVER(dir),
2965                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2966                                 &exception);
2967         } while (exception.retry);
2968         return err;
2969 }
2970
2971 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2972                 u64 cookie, struct page **pages, unsigned int count, int plus)
2973 {
2974         struct inode            *dir = dentry->d_inode;
2975         struct nfs4_readdir_arg args = {
2976                 .fh = NFS_FH(dir),
2977                 .pages = pages,
2978                 .pgbase = 0,
2979                 .count = count,
2980                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2981                 .plus = plus,
2982         };
2983         struct nfs4_readdir_res res;
2984         struct rpc_message msg = {
2985                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2986                 .rpc_argp = &args,
2987                 .rpc_resp = &res,
2988                 .rpc_cred = cred,
2989         };
2990         int                     status;
2991
2992         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2993                         dentry->d_parent->d_name.name,
2994                         dentry->d_name.name,
2995                         (unsigned long long)cookie);
2996         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2997         res.pgbase = args.pgbase;
2998         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
2999         if (status >= 0) {
3000                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3001                 status += args.pgbase;
3002         }
3003
3004         nfs_invalidate_atime(dir);
3005
3006         dprintk("%s: returns %d\n", __func__, status);
3007         return status;
3008 }
3009
3010 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3011                 u64 cookie, struct page **pages, unsigned int count, int plus)
3012 {
3013         struct nfs4_exception exception = { };
3014         int err;
3015         do {
3016                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3017                                 _nfs4_proc_readdir(dentry, cred, cookie,
3018                                         pages, count, plus),
3019                                 &exception);
3020         } while (exception.retry);
3021         return err;
3022 }
3023
3024 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3025                 struct iattr *sattr, dev_t rdev)
3026 {
3027         struct nfs4_createdata *data;
3028         int mode = sattr->ia_mode;
3029         int status = -ENOMEM;
3030
3031         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3032         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3033
3034         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3035         if (data == NULL)
3036                 goto out;
3037
3038         if (S_ISFIFO(mode))
3039                 data->arg.ftype = NF4FIFO;
3040         else if (S_ISBLK(mode)) {
3041                 data->arg.ftype = NF4BLK;
3042                 data->arg.u.device.specdata1 = MAJOR(rdev);
3043                 data->arg.u.device.specdata2 = MINOR(rdev);
3044         }
3045         else if (S_ISCHR(mode)) {
3046                 data->arg.ftype = NF4CHR;
3047                 data->arg.u.device.specdata1 = MAJOR(rdev);
3048                 data->arg.u.device.specdata2 = MINOR(rdev);
3049         }
3050
3051         status = nfs4_do_create(dir, dentry, data);
3052
3053         nfs4_free_createdata(data);
3054 out:
3055         return status;
3056 }
3057
3058 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3059                 struct iattr *sattr, dev_t rdev)
3060 {
3061         struct nfs4_exception exception = { };
3062         int err;
3063
3064         sattr->ia_mode &= ~current_umask();
3065         do {
3066                 err = nfs4_handle_exception(NFS_SERVER(dir),
3067                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3068                                 &exception);
3069         } while (exception.retry);
3070         return err;
3071 }
3072
3073 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3074                  struct nfs_fsstat *fsstat)
3075 {
3076         struct nfs4_statfs_arg args = {
3077                 .fh = fhandle,
3078                 .bitmask = server->attr_bitmask,
3079         };
3080         struct nfs4_statfs_res res = {
3081                 .fsstat = fsstat,
3082         };
3083         struct rpc_message msg = {
3084                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3085                 .rpc_argp = &args,
3086                 .rpc_resp = &res,
3087         };
3088
3089         nfs_fattr_init(fsstat->fattr);
3090         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3091 }
3092
3093 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3094 {
3095         struct nfs4_exception exception = { };
3096         int err;
3097         do {
3098                 err = nfs4_handle_exception(server,
3099                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3100                                 &exception);
3101         } while (exception.retry);
3102         return err;
3103 }
3104
3105 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3106                 struct nfs_fsinfo *fsinfo)
3107 {
3108         struct nfs4_fsinfo_arg args = {
3109                 .fh = fhandle,
3110                 .bitmask = server->attr_bitmask,
3111         };
3112         struct nfs4_fsinfo_res res = {
3113                 .fsinfo = fsinfo,
3114         };
3115         struct rpc_message msg = {
3116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3117                 .rpc_argp = &args,
3118                 .rpc_resp = &res,
3119         };
3120
3121         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3122 }
3123
3124 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3125 {
3126         struct nfs4_exception exception = { };
3127         int err;
3128
3129         do {
3130                 err = nfs4_handle_exception(server,
3131                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3132                                 &exception);
3133         } while (exception.retry);
3134         return err;
3135 }
3136
3137 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3138 {
3139         nfs_fattr_init(fsinfo->fattr);
3140         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3141 }
3142
3143 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3144                 struct nfs_pathconf *pathconf)
3145 {
3146         struct nfs4_pathconf_arg args = {
3147                 .fh = fhandle,
3148                 .bitmask = server->attr_bitmask,
3149         };
3150         struct nfs4_pathconf_res res = {
3151                 .pathconf = pathconf,
3152         };
3153         struct rpc_message msg = {
3154                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3155                 .rpc_argp = &args,
3156                 .rpc_resp = &res,
3157         };
3158
3159         /* None of the pathconf attributes are mandatory to implement */
3160         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3161                 memset(pathconf, 0, sizeof(*pathconf));
3162                 return 0;
3163         }
3164
3165         nfs_fattr_init(pathconf->fattr);
3166         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3167 }
3168
3169 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3170                 struct nfs_pathconf *pathconf)
3171 {
3172         struct nfs4_exception exception = { };
3173         int err;
3174
3175         do {
3176                 err = nfs4_handle_exception(server,
3177                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3178                                 &exception);
3179         } while (exception.retry);
3180         return err;
3181 }
3182
3183 void __nfs4_read_done_cb(struct nfs_read_data *data)
3184 {
3185         nfs_invalidate_atime(data->inode);
3186 }
3187
3188 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3189 {
3190         struct nfs_server *server = NFS_SERVER(data->inode);
3191
3192         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3193                 nfs_restart_rpc(task, server->nfs_client);
3194                 return -EAGAIN;
3195         }
3196
3197         __nfs4_read_done_cb(data);
3198         if (task->tk_status > 0)
3199                 renew_lease(server, data->timestamp);
3200         return 0;
3201 }
3202
3203 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3204 {
3205
3206         dprintk("--> %s\n", __func__);
3207
3208         if (!nfs4_sequence_done(task, &data->res.seq_res))
3209                 return -EAGAIN;
3210
3211         return data->read_done_cb ? data->read_done_cb(task, data) :
3212                                     nfs4_read_done_cb(task, data);
3213 }
3214
3215 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3216 {
3217         data->timestamp   = jiffies;
3218         data->read_done_cb = nfs4_read_done_cb;
3219         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3220 }
3221
3222 /* Reset the the nfs_read_data to send the read to the MDS. */
3223 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3224 {
3225         dprintk("%s Reset task for i/o through\n", __func__);
3226         put_lseg(data->lseg);
3227         data->lseg = NULL;
3228         /* offsets will differ in the dense stripe case */
3229         data->args.offset = data->mds_offset;
3230         data->ds_clp = NULL;
3231         data->args.fh     = NFS_FH(data->inode);
3232         data->read_done_cb = nfs4_read_done_cb;
3233         task->tk_ops = data->mds_ops;
3234         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3235 }
3236 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3237
3238 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3239 {
3240         struct inode *inode = data->inode;
3241
3242         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3243                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3244                 return -EAGAIN;
3245         }
3246         if (task->tk_status >= 0) {
3247                 renew_lease(NFS_SERVER(inode), data->timestamp);
3248                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3249         }
3250         return 0;
3251 }
3252
3253 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3254 {
3255         if (!nfs4_sequence_done(task, &data->res.seq_res))
3256                 return -EAGAIN;
3257         return data->write_done_cb ? data->write_done_cb(task, data) :
3258                 nfs4_write_done_cb(task, data);
3259 }
3260
3261 /* Reset the the nfs_write_data to send the write to the MDS. */
3262 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3263 {
3264         dprintk("%s Reset task for i/o through\n", __func__);
3265         put_lseg(data->lseg);
3266         data->lseg          = NULL;
3267         data->ds_clp        = NULL;
3268         data->write_done_cb = nfs4_write_done_cb;
3269         data->args.fh       = NFS_FH(data->inode);
3270         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3271         data->args.offset   = data->mds_offset;
3272         data->res.fattr     = &data->fattr;
3273         task->tk_ops        = data->mds_ops;
3274         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3275 }
3276 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3277
3278 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3279 {
3280         struct nfs_server *server = NFS_SERVER(data->inode);
3281
3282         if (data->lseg) {
3283                 data->args.bitmask = NULL;
3284                 data->res.fattr = NULL;
3285         } else
3286                 data->args.bitmask = server->cache_consistency_bitmask;
3287         if (!data->write_done_cb)
3288                 data->write_done_cb = nfs4_write_done_cb;
3289         data->res.server = server;
3290         data->timestamp   = jiffies;
3291
3292         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3293 }
3294
3295 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3296 {
3297         struct inode *inode = data->inode;
3298
3299         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3300                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3301                 return -EAGAIN;
3302         }
3303         nfs_refresh_inode(inode, data->res.fattr);
3304         return 0;
3305 }
3306
3307 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3308 {
3309         if (!nfs4_sequence_done(task, &data->res.seq_res))
3310                 return -EAGAIN;
3311         return data->write_done_cb(task, data);
3312 }
3313
3314 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3315 {
3316         struct nfs_server *server = NFS_SERVER(data->inode);
3317
3318         if (data->lseg) {
3319                 data->args.bitmask = NULL;
3320                 data->res.fattr = NULL;
3321         } else
3322                 data->args.bitmask = server->cache_consistency_bitmask;
3323         if (!data->write_done_cb)
3324                 data->write_done_cb = nfs4_commit_done_cb;
3325         data->res.server = server;
3326         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3327 }
3328
3329 struct nfs4_renewdata {
3330         struct nfs_client       *client;
3331         unsigned long           timestamp;
3332 };
3333
3334 /*
3335  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3336  * standalone procedure for queueing an asynchronous RENEW.
3337  */
3338 static void nfs4_renew_release(void *calldata)
3339 {
3340         struct nfs4_renewdata *data = calldata;
3341         struct nfs_client *clp = data->client;
3342
3343         if (atomic_read(&clp->cl_count) > 1)
3344                 nfs4_schedule_state_renewal(clp);
3345         nfs_put_client(clp);
3346         kfree(data);
3347 }
3348
3349 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3350 {
3351         struct nfs4_renewdata *data = calldata;
3352         struct nfs_client *clp = data->client;
3353         unsigned long timestamp = data->timestamp;
3354
3355         if (task->tk_status < 0) {
3356                 /* Unless we're shutting down, schedule state recovery! */
3357                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3358                         nfs4_schedule_lease_recovery(clp);
3359                 return;
3360         }
3361         do_renew_lease(clp, timestamp);
3362 }
3363
3364 static const struct rpc_call_ops nfs4_renew_ops = {
3365         .rpc_call_done = nfs4_renew_done,
3366         .rpc_release = nfs4_renew_release,
3367 };
3368
3369 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3370 {
3371         struct rpc_message msg = {
3372                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3373                 .rpc_argp       = clp,
3374                 .rpc_cred       = cred,
3375         };
3376         struct nfs4_renewdata *data;
3377
3378         if (!atomic_inc_not_zero(&clp->cl_count))
3379                 return -EIO;
3380         data = kmalloc(sizeof(*data), GFP_KERNEL);
3381         if (data == NULL)
3382                 return -ENOMEM;
3383         data->client = clp;
3384         data->timestamp = jiffies;
3385         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3386                         &nfs4_renew_ops, data);
3387 }
3388
3389 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3390 {
3391         struct rpc_message msg = {
3392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3393                 .rpc_argp       = clp,
3394                 .rpc_cred       = cred,
3395         };
3396         unsigned long now = jiffies;
3397         int status;
3398
3399         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3400         if (status < 0)
3401                 return status;
3402         do_renew_lease(clp, now);
3403         return 0;
3404 }
3405
3406 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3407 {
3408         return (server->caps & NFS_CAP_ACLS)
3409                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3410                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3411 }
3412
3413 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3414  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3415  * the stack.
3416  */
3417 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3418
3419 static void buf_to_pages(const void *buf, size_t buflen,
3420                 struct page **pages, unsigned int *pgbase)
3421 {
3422         const void *p = buf;
3423
3424         *pgbase = offset_in_page(buf);
3425         p -= *pgbase;
3426         while (p < buf + buflen) {
3427                 *(pages++) = virt_to_page(p);
3428                 p += PAGE_CACHE_SIZE;
3429         }
3430 }
3431
3432 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3433                 struct page **pages, unsigned int *pgbase)
3434 {
3435         struct page *newpage, **spages;
3436         int rc = 0;
3437         size_t len;
3438         spages = pages;
3439
3440         do {
3441                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3442                 newpage = alloc_page(GFP_KERNEL);
3443
3444                 if (newpage == NULL)
3445                         goto unwind;
3446                 memcpy(page_address(newpage), buf, len);
3447                 buf += len;
3448                 buflen -= len;
3449                 *pages++ = newpage;
3450                 rc++;
3451         } while (buflen != 0);
3452
3453         return rc;
3454
3455 unwind:
3456         for(; rc > 0; rc--)
3457                 __free_page(spages[rc-1]);
3458         return -ENOMEM;
3459 }
3460
3461 struct nfs4_cached_acl {
3462         int cached;
3463         size_t len;
3464         char data[0];
3465 };
3466
3467 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3468 {
3469         struct nfs_inode *nfsi = NFS_I(inode);
3470
3471         spin_lock(&inode->i_lock);
3472         kfree(nfsi->nfs4_acl);
3473         nfsi->nfs4_acl = acl;
3474         spin_unlock(&inode->i_lock);
3475 }
3476
3477 static void nfs4_zap_acl_attr(struct inode *inode)
3478 {
3479         nfs4_set_cached_acl(inode, NULL);
3480 }
3481
3482 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3483 {
3484         struct nfs_inode *nfsi = NFS_I(inode);
3485         struct nfs4_cached_acl *acl;
3486         int ret = -ENOENT;
3487
3488         spin_lock(&inode->i_lock);
3489         acl = nfsi->nfs4_acl;
3490         if (acl == NULL)
3491                 goto out;
3492         if (buf == NULL) /* user is just asking for length */
3493                 goto out_len;
3494         if (acl->cached == 0)
3495                 goto out;
3496         ret = -ERANGE; /* see getxattr(2) man page */
3497         if (acl->len > buflen)
3498                 goto out;
3499         memcpy(buf, acl->data, acl->len);
3500 out_len:
3501         ret = acl->len;
3502 out:
3503         spin_unlock(&inode->i_lock);
3504         return ret;
3505 }
3506
3507 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3508 {
3509         struct nfs4_cached_acl *acl;
3510
3511         if (buf && acl_len <= PAGE_SIZE) {
3512                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3513                 if (acl == NULL)
3514                         goto out;
3515                 acl->cached = 1;
3516                 memcpy(acl->data, buf, acl_len);
3517         } else {
3518                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3519                 if (acl == NULL)
3520                         goto out;
3521                 acl->cached = 0;
3522         }
3523         acl->len = acl_len;
3524 out:
3525         nfs4_set_cached_acl(inode, acl);
3526 }
3527
3528 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3529 {
3530         struct page *pages[NFS4ACL_MAXPAGES];
3531         struct nfs_getaclargs args = {
3532                 .fh = NFS_FH(inode),
3533                 .acl_pages = pages,
3534                 .acl_len = buflen,
3535         };
3536         struct nfs_getaclres res = {
3537                 .acl_len = buflen,
3538         };
3539         void *resp_buf;
3540         struct rpc_message msg = {
3541                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3542                 .rpc_argp = &args,
3543                 .rpc_resp = &res,
3544         };
3545         struct page *localpage = NULL;
3546         int ret;
3547
3548         if (buflen < PAGE_SIZE) {
3549                 /* As long as we're doing a round trip to the server anyway,
3550                  * let's be prepared for a page of acl data. */
3551                 localpage = alloc_page(GFP_KERNEL);
3552                 resp_buf = page_address(localpage);
3553                 if (localpage == NULL)
3554                         return -ENOMEM;
3555                 args.acl_pages[0] = localpage;
3556                 args.acl_pgbase = 0;
3557                 args.acl_len = PAGE_SIZE;
3558         } else {
3559                 resp_buf = buf;
3560                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3561         }
3562         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3563         if (ret)
3564                 goto out_free;
3565         if (res.acl_len > args.acl_len)
3566                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3567         else
3568                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3569         if (buf) {
3570                 ret = -ERANGE;
3571                 if (res.acl_len > buflen)
3572                         goto out_free;
3573                 if (localpage)
3574                         memcpy(buf, resp_buf, res.acl_len);
3575         }
3576         ret = res.acl_len;
3577 out_free:
3578         if (localpage)
3579                 __free_page(localpage);
3580         return ret;
3581 }
3582
3583 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3584 {
3585         struct nfs4_exception exception = { };
3586         ssize_t ret;
3587         do {
3588                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3589                 if (ret >= 0)
3590                         break;
3591                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3592         } while (exception.retry);
3593         return ret;
3594 }
3595
3596 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3597 {
3598         struct nfs_server *server = NFS_SERVER(inode);
3599         int ret;
3600
3601         if (!nfs4_server_supports_acls(server))
3602                 return -EOPNOTSUPP;
3603         ret = nfs_revalidate_inode(server, inode);
3604         if (ret < 0)
3605                 return ret;
3606         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3607                 nfs_zap_acl_cache(inode);
3608         ret = nfs4_read_cached_acl(inode, buf, buflen);
3609         if (ret != -ENOENT)
3610                 return ret;
3611         return nfs4_get_acl_uncached(inode, buf, buflen);
3612 }
3613
3614 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3615 {
3616         struct nfs_server *server = NFS_SERVER(inode);
3617         struct page *pages[NFS4ACL_MAXPAGES];
3618         struct nfs_setaclargs arg = {
3619                 .fh             = NFS_FH(inode),
3620                 .acl_pages      = pages,
3621                 .acl_len        = buflen,
3622         };
3623         struct nfs_setaclres res;
3624         struct rpc_message msg = {
3625                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3626                 .rpc_argp       = &arg,
3627                 .rpc_resp       = &res,
3628         };
3629         int ret, i;
3630
3631         if (!nfs4_server_supports_acls(server))
3632                 return -EOPNOTSUPP;
3633         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3634         if (i < 0)
3635                 return i;
3636         nfs_inode_return_delegation(inode);
3637         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3638
3639         /*
3640          * Free each page after tx, so the only ref left is
3641          * held by the network stack
3642          */
3643         for (; i > 0; i--)
3644                 put_page(pages[i-1]);
3645
3646         /*
3647          * Acl update can result in inode attribute update.
3648          * so mark the attribute cache invalid.
3649          */
3650         spin_lock(&inode->i_lock);
3651         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3652         spin_unlock(&inode->i_lock);
3653         nfs_access_zap_cache(inode);
3654         nfs_zap_acl_cache(inode);
3655         return ret;
3656 }
3657
3658 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3659 {
3660         struct nfs4_exception exception = { };
3661         int err;
3662         do {
3663                 err = nfs4_handle_exception(NFS_SERVER(inode),
3664                                 __nfs4_proc_set_acl(inode, buf, buflen),
3665                                 &exception);
3666         } while (exception.retry);
3667         return err;
3668 }
3669
3670 static int
3671 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3672 {
3673         struct nfs_client *clp = server->nfs_client;
3674
3675         if (task->tk_status >= 0)
3676                 return 0;
3677         switch(task->tk_status) {
3678                 case -NFS4ERR_ADMIN_REVOKED:
3679                 case -NFS4ERR_BAD_STATEID:
3680                 case -NFS4ERR_OPENMODE:
3681                         if (state == NULL)
3682                                 break;
3683                         nfs4_schedule_stateid_recovery(server, state);
3684                         goto wait_on_recovery;
3685                 case -NFS4ERR_EXPIRED:
3686                         if (state != NULL)
3687                                 nfs4_schedule_stateid_recovery(server, state);
3688                 case -NFS4ERR_STALE_STATEID:
3689                 case -NFS4ERR_STALE_CLIENTID:
3690                         nfs4_schedule_lease_recovery(clp);
3691                         goto wait_on_recovery;
3692 #if defined(CONFIG_NFS_V4_1)
3693                 case -NFS4ERR_BADSESSION:
3694                 case -NFS4ERR_BADSLOT:
3695                 case -NFS4ERR_BAD_HIGH_SLOT:
3696                 case -NFS4ERR_DEADSESSION:
3697                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3698                 case -NFS4ERR_SEQ_FALSE_RETRY:
3699                 case -NFS4ERR_SEQ_MISORDERED:
3700                         dprintk("%s ERROR %d, Reset session\n", __func__,
3701                                 task->tk_status);
3702                         nfs4_schedule_session_recovery(clp->cl_session);
3703                         task->tk_status = 0;
3704                         return -EAGAIN;
3705 #endif /* CONFIG_NFS_V4_1 */
3706                 case -NFS4ERR_DELAY:
3707                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3708                 case -NFS4ERR_GRACE:
3709                 case -EKEYEXPIRED:
3710                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3711                         task->tk_status = 0;
3712                         return -EAGAIN;
3713                 case -NFS4ERR_RETRY_UNCACHED_REP:
3714                 case -NFS4ERR_OLD_STATEID:
3715                         task->tk_status = 0;
3716                         return -EAGAIN;
3717         }
3718         task->tk_status = nfs4_map_errors(task->tk_status);
3719         return 0;
3720 wait_on_recovery:
3721         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3722         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3723                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3724         task->tk_status = 0;
3725         return -EAGAIN;
3726 }
3727
3728 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3729                 unsigned short port, struct rpc_cred *cred,
3730                 struct nfs4_setclientid_res *res)
3731 {
3732         nfs4_verifier sc_verifier;
3733         struct nfs4_setclientid setclientid = {
3734                 .sc_verifier = &sc_verifier,
3735                 .sc_prog = program,
3736                 .sc_cb_ident = clp->cl_cb_ident,
3737         };
3738         struct rpc_message msg = {
3739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3740                 .rpc_argp = &setclientid,
3741                 .rpc_resp = res,
3742                 .rpc_cred = cred,
3743         };
3744         __be32 *p;
3745         int loop = 0;
3746         int status;
3747
3748         p = (__be32*)sc_verifier.data;
3749         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3750         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3751
3752         for(;;) {
3753                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3754                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3755                                 clp->cl_ipaddr,
3756                                 rpc_peeraddr2str(clp->cl_rpcclient,
3757                                                         RPC_DISPLAY_ADDR),
3758                                 rpc_peeraddr2str(clp->cl_rpcclient,
3759                                                         RPC_DISPLAY_PROTO),
3760                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3761                                 clp->cl_id_uniquifier);
3762                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3763                                 sizeof(setclientid.sc_netid),
3764                                 rpc_peeraddr2str(clp->cl_rpcclient,
3765                                                         RPC_DISPLAY_NETID));
3766                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3767                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3768                                 clp->cl_ipaddr, port >> 8, port & 255);
3769
3770                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3771                 if (status != -NFS4ERR_CLID_INUSE)
3772                         break;
3773                 if (loop != 0) {
3774                         ++clp->cl_id_uniquifier;
3775                         break;
3776                 }
3777                 ++loop;
3778                 ssleep(clp->cl_lease_time / HZ + 1);
3779         }
3780         return status;
3781 }
3782
3783 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3784                 struct nfs4_setclientid_res *arg,
3785                 struct rpc_cred *cred)
3786 {
3787         struct nfs_fsinfo fsinfo;
3788         struct rpc_message msg = {
3789                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3790                 .rpc_argp = arg,
3791                 .rpc_resp = &fsinfo,
3792                 .rpc_cred = cred,
3793         };
3794         unsigned long now;
3795         int status;
3796
3797         now = jiffies;
3798         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3799         if (status == 0) {
3800                 spin_lock(&clp->cl_lock);
3801                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3802                 clp->cl_last_renewal = now;
3803                 spin_unlock(&clp->cl_lock);
3804         }
3805         return status;
3806 }
3807
3808 struct nfs4_delegreturndata {
3809         struct nfs4_delegreturnargs args;
3810         struct nfs4_delegreturnres res;
3811         struct nfs_fh fh;
3812         nfs4_stateid stateid;
3813         unsigned long timestamp;
3814         struct nfs_fattr fattr;
3815         int rpc_status;
3816 };
3817
3818 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3819 {
3820         struct nfs4_delegreturndata *data = calldata;
3821
3822         if (!nfs4_sequence_done(task, &data->res.seq_res))
3823                 return;
3824
3825         switch (task->tk_status) {
3826         case -NFS4ERR_STALE_STATEID:
3827         case -NFS4ERR_EXPIRED:
3828         case 0:
3829                 renew_lease(data->res.server, data->timestamp);
3830                 break;
3831         default:
3832                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3833                                 -EAGAIN) {
3834                         nfs_restart_rpc(task, data->res.server->nfs_client);
3835                         return;
3836                 }
3837         }
3838         data->rpc_status = task->tk_status;
3839 }
3840
3841 static void nfs4_delegreturn_release(void *calldata)
3842 {
3843         kfree(calldata);
3844 }
3845
3846 #if defined(CONFIG_NFS_V4_1)
3847 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3848 {
3849         struct nfs4_delegreturndata *d_data;
3850
3851         d_data = (struct nfs4_delegreturndata *)data;
3852
3853         if (nfs4_setup_sequence(d_data->res.server,
3854                                 &d_data->args.seq_args,
3855                                 &d_data->res.seq_res, 1, task))
3856                 return;
3857         rpc_call_start(task);
3858 }
3859 #endif /* CONFIG_NFS_V4_1 */
3860
3861 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3862 #if defined(CONFIG_NFS_V4_1)
3863         .rpc_call_prepare = nfs4_delegreturn_prepare,
3864 #endif /* CONFIG_NFS_V4_1 */
3865         .rpc_call_done = nfs4_delegreturn_done,
3866         .rpc_release = nfs4_delegreturn_release,
3867 };
3868
3869 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3870 {
3871         struct nfs4_delegreturndata *data;
3872         struct nfs_server *server = NFS_SERVER(inode);
3873         struct rpc_task *task;
3874         struct rpc_message msg = {
3875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3876                 .rpc_cred = cred,
3877         };
3878         struct rpc_task_setup task_setup_data = {
3879                 .rpc_client = server->client,
3880                 .rpc_message = &msg,
3881                 .callback_ops = &nfs4_delegreturn_ops,
3882                 .flags = RPC_TASK_ASYNC,
3883         };
3884         int status = 0;
3885
3886         data = kzalloc(sizeof(*data), GFP_NOFS);
3887         if (data == NULL)
3888                 return -ENOMEM;
3889         data->args.fhandle = &data->fh;
3890         data->args.stateid = &data->stateid;
3891         data->args.bitmask = server->attr_bitmask;
3892         nfs_copy_fh(&data->fh, NFS_FH(inode));
3893         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3894         data->res.fattr = &data->fattr;
3895         data->res.server = server;
3896         nfs_fattr_init(data->res.fattr);
3897         data->timestamp = jiffies;
3898         data->rpc_status = 0;
3899
3900         task_setup_data.callback_data = data;
3901         msg.rpc_argp = &data->args;
3902         msg.rpc_resp = &data->res;
3903         task = rpc_run_task(&task_setup_data);
3904         if (IS_ERR(task))
3905                 return PTR_ERR(task);
3906         if (!issync)
3907                 goto out;
3908         status = nfs4_wait_for_completion_rpc_task(task);
3909         if (status != 0)
3910                 goto out;
3911         status = data->rpc_status;
3912         if (status != 0)
3913                 goto out;
3914         nfs_refresh_inode(inode, &data->fattr);
3915 out:
3916         rpc_put_task(task);
3917         return status;
3918 }
3919
3920 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3921 {
3922         struct nfs_server *server = NFS_SERVER(inode);
3923         struct nfs4_exception exception = { };
3924         int err;
3925         do {
3926                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3927                 switch (err) {
3928                         case -NFS4ERR_STALE_STATEID:
3929                         case -NFS4ERR_EXPIRED:
3930                         case 0:
3931                                 return 0;
3932                 }
3933                 err = nfs4_handle_exception(server, err, &exception);
3934         } while (exception.retry);
3935         return err;
3936 }
3937
3938 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3939 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3940
3941 /*
3942  * sleep, with exponential backoff, and retry the LOCK operation.
3943  */
3944 static unsigned long
3945 nfs4_set_lock_task_retry(unsigned long timeout)
3946 {
3947         schedule_timeout_killable(timeout);
3948         timeout <<= 1;
3949         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3950                 return NFS4_LOCK_MAXTIMEOUT;
3951         return timeout;
3952 }
3953
3954 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3955 {
3956         struct inode *inode = state->inode;
3957         struct nfs_server *server = NFS_SERVER(inode);
3958         struct nfs_client *clp = server->nfs_client;
3959         struct nfs_lockt_args arg = {
3960                 .fh = NFS_FH(inode),
3961                 .fl = request,
3962         };
3963         struct nfs_lockt_res res = {
3964                 .denied = request,
3965         };
3966         struct rpc_message msg = {
3967                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3968                 .rpc_argp       = &arg,
3969                 .rpc_resp       = &res,
3970                 .rpc_cred       = state->owner->so_cred,
3971         };
3972         struct nfs4_lock_state *lsp;
3973         int status;
3974
3975         arg.lock_owner.clientid = clp->cl_clientid;
3976         status = nfs4_set_lock_state(state, request);
3977         if (status != 0)
3978                 goto out;
3979         lsp = request->fl_u.nfs4_fl.owner;
3980         arg.lock_owner.id = lsp->ls_id.id;
3981         arg.lock_owner.s_dev = server->s_dev;
3982         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3983         switch (status) {
3984                 case 0:
3985                         request->fl_type = F_UNLCK;
3986                         break;
3987                 case -NFS4ERR_DENIED:
3988                         status = 0;
3989         }
3990         request->fl_ops->fl_release_private(request);
3991 out:
3992         return status;
3993 }
3994
3995 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3996 {
3997         struct nfs4_exception exception = { };
3998         int err;
3999
4000         do {
4001                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4002                                 _nfs4_proc_getlk(state, cmd, request),
4003                                 &exception);
4004         } while (exception.retry);
4005         return err;
4006 }
4007
4008 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4009 {
4010         int res = 0;
4011         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4012                 case FL_POSIX:
4013                         res = posix_lock_file_wait(file, fl);
4014                         break;
4015                 case FL_FLOCK:
4016                         res = flock_lock_file_wait(file, fl);
4017                         break;
4018                 default:
4019                         BUG();
4020         }
4021         return res;
4022 }
4023
4024 struct nfs4_unlockdata {
4025         struct nfs_locku_args arg;
4026         struct nfs_locku_res res;
4027         struct nfs4_lock_state *lsp;
4028         struct nfs_open_context *ctx;
4029         struct file_lock fl;
4030         const struct nfs_server *server;
4031         unsigned long timestamp;
4032 };
4033
4034 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4035                 struct nfs_open_context *ctx,
4036                 struct nfs4_lock_state *lsp,
4037                 struct nfs_seqid *seqid)
4038 {
4039         struct nfs4_unlockdata *p;
4040         struct inode *inode = lsp->ls_state->inode;
4041
4042         p = kzalloc(sizeof(*p), GFP_NOFS);
4043         if (p == NULL)
4044                 return NULL;
4045         p->arg.fh = NFS_FH(inode);
4046         p->arg.fl = &p->fl;
4047         p->arg.seqid = seqid;
4048         p->res.seqid = seqid;
4049         p->arg.stateid = &lsp->ls_stateid;
4050         p->lsp = lsp;
4051         atomic_inc(&lsp->ls_count);
4052         /* Ensure we don't close file until we're done freeing locks! */
4053         p->ctx = get_nfs_open_context(ctx);
4054         memcpy(&p->fl, fl, sizeof(p->fl));
4055         p->server = NFS_SERVER(inode);
4056         return p;
4057 }
4058
4059 static void nfs4_locku_release_calldata(void *data)
4060 {
4061         struct nfs4_unlockdata *calldata = data;
4062         nfs_free_seqid(calldata->arg.seqid);
4063         nfs4_put_lock_state(calldata->lsp);
4064         put_nfs_open_context(calldata->ctx);
4065         kfree(calldata);
4066 }
4067
4068 static void nfs4_locku_done(struct rpc_task *task, void *data)
4069 {
4070         struct nfs4_unlockdata *calldata = data;
4071
4072         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4073                 return;
4074         switch (task->tk_status) {
4075                 case 0:
4076                         memcpy(calldata->lsp->ls_stateid.data,
4077                                         calldata->res.stateid.data,
4078                                         sizeof(calldata->lsp->ls_stateid.data));
4079                         renew_lease(calldata->server, calldata->timestamp);
4080                         break;
4081                 case -NFS4ERR_BAD_STATEID:
4082                 case -NFS4ERR_OLD_STATEID:
4083                 case -NFS4ERR_STALE_STATEID:
4084                 case -NFS4ERR_EXPIRED:
4085                         break;
4086                 default:
4087                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4088                                 nfs_restart_rpc(task,
4089                                                  calldata->server->nfs_client);
4090         }
4091 }
4092
4093 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4094 {
4095         struct nfs4_unlockdata *calldata = data;
4096
4097         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4098                 return;
4099         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4100                 /* Note: exit _without_ running nfs4_locku_done */
4101                 task->tk_action = NULL;
4102                 return;
4103         }
4104         calldata->timestamp = jiffies;
4105         if (nfs4_setup_sequence(calldata->server,
4106                                 &calldata->arg.seq_args,
4107                                 &calldata->res.seq_res, 1, task))
4108                 return;
4109         rpc_call_start(task);
4110 }
4111
4112 static const struct rpc_call_ops nfs4_locku_ops = {
4113         .rpc_call_prepare = nfs4_locku_prepare,
4114         .rpc_call_done = nfs4_locku_done,
4115         .rpc_release = nfs4_locku_release_calldata,
4116 };
4117
4118 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4119                 struct nfs_open_context *ctx,
4120                 struct nfs4_lock_state *lsp,
4121                 struct nfs_seqid *seqid)
4122 {
4123         struct nfs4_unlockdata *data;
4124         struct rpc_message msg = {
4125                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4126                 .rpc_cred = ctx->cred,
4127         };
4128         struct rpc_task_setup task_setup_data = {
4129                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4130                 .rpc_message = &msg,
4131                 .callback_ops = &nfs4_locku_ops,
4132                 .workqueue = nfsiod_workqueue,
4133                 .flags = RPC_TASK_ASYNC,
4134         };
4135
4136         /* Ensure this is an unlock - when canceling a lock, the
4137          * canceled lock is passed in, and it won't be an unlock.
4138          */
4139         fl->fl_type = F_UNLCK;
4140
4141         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4142         if (data == NULL) {
4143                 nfs_free_seqid(seqid);
4144                 return ERR_PTR(-ENOMEM);
4145         }
4146
4147         msg.rpc_argp = &data->arg;
4148         msg.rpc_resp = &data->res;
4149         task_setup_data.callback_data = data;
4150         return rpc_run_task(&task_setup_data);
4151 }
4152
4153 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4154 {
4155         struct nfs_inode *nfsi = NFS_I(state->inode);
4156         struct nfs_seqid *seqid;
4157         struct nfs4_lock_state *lsp;
4158         struct rpc_task *task;
4159         int status = 0;
4160         unsigned char fl_flags = request->fl_flags;
4161
4162         status = nfs4_set_lock_state(state, request);
4163         /* Unlock _before_ we do the RPC call */
4164         request->fl_flags |= FL_EXISTS;
4165         down_read(&nfsi->rwsem);
4166         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4167                 up_read(&nfsi->rwsem);
4168                 goto out;
4169         }
4170         up_read(&nfsi->rwsem);
4171         if (status != 0)
4172                 goto out;
4173         /* Is this a delegated lock? */
4174         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4175                 goto out;
4176         lsp = request->fl_u.nfs4_fl.owner;
4177         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4178         status = -ENOMEM;
4179         if (seqid == NULL)
4180                 goto out;
4181         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4182         status = PTR_ERR(task);
4183         if (IS_ERR(task))
4184                 goto out;
4185         status = nfs4_wait_for_completion_rpc_task(task);
4186         rpc_put_task(task);
4187 out:
4188         request->fl_flags = fl_flags;
4189         return status;
4190 }
4191
4192 struct nfs4_lockdata {
4193         struct nfs_lock_args arg;
4194         struct nfs_lock_res res;
4195         struct nfs4_lock_state *lsp;
4196         struct nfs_open_context *ctx;
4197         struct file_lock fl;
4198         unsigned long timestamp;
4199         int rpc_status;
4200         int cancelled;
4201         struct nfs_server *server;
4202 };
4203
4204 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4205                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4206                 gfp_t gfp_mask)
4207 {
4208         struct nfs4_lockdata *p;
4209         struct inode *inode = lsp->ls_state->inode;
4210         struct nfs_server *server = NFS_SERVER(inode);
4211
4212         p = kzalloc(sizeof(*p), gfp_mask);
4213         if (p == NULL)
4214                 return NULL;
4215
4216         p->arg.fh = NFS_FH(inode);
4217         p->arg.fl = &p->fl;
4218         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4219         if (p->arg.open_seqid == NULL)
4220                 goto out_free;
4221         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4222         if (p->arg.lock_seqid == NULL)
4223                 goto out_free_seqid;
4224         p->arg.lock_stateid = &lsp->ls_stateid;
4225         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4226         p->arg.lock_owner.id = lsp->ls_id.id;
4227         p->arg.lock_owner.s_dev = server->s_dev;
4228         p->res.lock_seqid = p->arg.lock_seqid;
4229         p->lsp = lsp;
4230         p->server = server;
4231         atomic_inc(&lsp->ls_count);
4232         p->ctx = get_nfs_open_context(ctx);
4233         memcpy(&p->fl, fl, sizeof(p->fl));
4234         return p;
4235 out_free_seqid:
4236         nfs_free_seqid(p->arg.open_seqid);
4237 out_free:
4238         kfree(p);
4239         return NULL;
4240 }
4241
4242 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4243 {
4244         struct nfs4_lockdata *data = calldata;
4245         struct nfs4_state *state = data->lsp->ls_state;
4246
4247         dprintk("%s: begin!\n", __func__);
4248         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4249                 return;
4250         /* Do we need to do an open_to_lock_owner? */
4251         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4252                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4253                         return;
4254                 data->arg.open_stateid = &state->stateid;
4255                 data->arg.new_lock_owner = 1;
4256                 data->res.open_seqid = data->arg.open_seqid;
4257         } else
4258                 data->arg.new_lock_owner = 0;
4259         data->timestamp = jiffies;
4260         if (nfs4_setup_sequence(data->server,
4261                                 &data->arg.seq_args,
4262                                 &data->res.seq_res, 1, task))
4263                 return;
4264         rpc_call_start(task);
4265         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4266 }
4267
4268 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4269 {
4270         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4271         nfs4_lock_prepare(task, calldata);
4272 }
4273
4274 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4275 {
4276         struct nfs4_lockdata *data = calldata;
4277
4278         dprintk("%s: begin!\n", __func__);
4279
4280         if (!nfs4_sequence_done(task, &data->res.seq_res))
4281                 return;
4282
4283         data->rpc_status = task->tk_status;
4284         if (data->arg.new_lock_owner != 0) {
4285                 if (data->rpc_status == 0)
4286                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4287                 else
4288                         goto out;
4289         }
4290         if (data->rpc_status == 0) {
4291                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4292                                         sizeof(data->lsp->ls_stateid.data));
4293                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4294                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4295         }
4296 out:
4297         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4298 }
4299
4300 static void nfs4_lock_release(void *calldata)
4301 {
4302         struct nfs4_lockdata *data = calldata;
4303
4304         dprintk("%s: begin!\n", __func__);
4305         nfs_free_seqid(data->arg.open_seqid);
4306         if (data->cancelled != 0) {
4307                 struct rpc_task *task;
4308                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4309                                 data->arg.lock_seqid);
4310                 if (!IS_ERR(task))
4311                         rpc_put_task_async(task);
4312                 dprintk("%s: cancelling lock!\n", __func__);
4313         } else
4314                 nfs_free_seqid(data->arg.lock_seqid);
4315         nfs4_put_lock_state(data->lsp);
4316         put_nfs_open_context(data->ctx);
4317         kfree(data);
4318         dprintk("%s: done!\n", __func__);
4319 }
4320
4321 static const struct rpc_call_ops nfs4_lock_ops = {
4322         .rpc_call_prepare = nfs4_lock_prepare,
4323         .rpc_call_done = nfs4_lock_done,
4324         .rpc_release = nfs4_lock_release,
4325 };
4326
4327 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4328         .rpc_call_prepare = nfs4_recover_lock_prepare,
4329         .rpc_call_done = nfs4_lock_done,
4330         .rpc_release = nfs4_lock_release,
4331 };
4332
4333 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4334 {
4335         switch (error) {
4336         case -NFS4ERR_ADMIN_REVOKED:
4337         case -NFS4ERR_BAD_STATEID:
4338                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4339                 if (new_lock_owner != 0 ||
4340                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4341                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4342                 break;
4343         case -NFS4ERR_STALE_STATEID:
4344                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4345         case -NFS4ERR_EXPIRED:
4346                 nfs4_schedule_lease_recovery(server->nfs_client);
4347         };
4348 }
4349
4350 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4351 {
4352         struct nfs4_lockdata *data;
4353         struct rpc_task *task;
4354         struct rpc_message msg = {
4355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4356                 .rpc_cred = state->owner->so_cred,
4357         };
4358         struct rpc_task_setup task_setup_data = {
4359                 .rpc_client = NFS_CLIENT(state->inode),
4360                 .rpc_message = &msg,
4361                 .callback_ops = &nfs4_lock_ops,
4362                 .workqueue = nfsiod_workqueue,
4363                 .flags = RPC_TASK_ASYNC,
4364         };
4365         int ret;
4366
4367         dprintk("%s: begin!\n", __func__);
4368         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4369                         fl->fl_u.nfs4_fl.owner,
4370                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4371         if (data == NULL)
4372                 return -ENOMEM;
4373         if (IS_SETLKW(cmd))
4374                 data->arg.block = 1;
4375         if (recovery_type > NFS_LOCK_NEW) {
4376                 if (recovery_type == NFS_LOCK_RECLAIM)
4377                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4378                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4379         }
4380         msg.rpc_argp = &data->arg;
4381         msg.rpc_resp = &data->res;
4382         task_setup_data.callback_data = data;
4383         task = rpc_run_task(&task_setup_data);
4384         if (IS_ERR(task))
4385                 return PTR_ERR(task);
4386         ret = nfs4_wait_for_completion_rpc_task(task);
4387         if (ret == 0) {
4388                 ret = data->rpc_status;
4389                 if (ret)
4390                         nfs4_handle_setlk_error(data->server, data->lsp,
4391                                         data->arg.new_lock_owner, ret);
4392         } else
4393                 data->cancelled = 1;
4394         rpc_put_task(task);
4395         dprintk("%s: done, ret = %d!\n", __func__, ret);
4396         return ret;
4397 }
4398
4399 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4400 {
4401         struct nfs_server *server = NFS_SERVER(state->inode);
4402         struct nfs4_exception exception = { };
4403         int err;
4404
4405         do {
4406                 /* Cache the lock if possible... */
4407                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4408                         return 0;
4409                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4410                 if (err != -NFS4ERR_DELAY)
4411                         break;
4412                 nfs4_handle_exception(server, err, &exception);
4413         } while (exception.retry);
4414         return err;
4415 }
4416
4417 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4418 {
4419         struct nfs_server *server = NFS_SERVER(state->inode);
4420         struct nfs4_exception exception = { };
4421         int err;
4422
4423         err = nfs4_set_lock_state(state, request);
4424         if (err != 0)
4425                 return err;
4426         do {
4427                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4428                         return 0;
4429                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4430                 switch (err) {
4431                 default:
4432                         goto out;
4433                 case -NFS4ERR_GRACE:
4434                 case -NFS4ERR_DELAY:
4435                         nfs4_handle_exception(server, err, &exception);
4436                         err = 0;
4437                 }
4438         } while (exception.retry);
4439 out:
4440         return err;
4441 }
4442
4443 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4444 {
4445         struct nfs_inode *nfsi = NFS_I(state->inode);
4446         unsigned char fl_flags = request->fl_flags;
4447         int status = -ENOLCK;
4448
4449         if ((fl_flags & FL_POSIX) &&
4450                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4451                 goto out;
4452         /* Is this a delegated open? */
4453         status = nfs4_set_lock_state(state, request);
4454         if (status != 0)
4455                 goto out;
4456         request->fl_flags |= FL_ACCESS;
4457         status = do_vfs_lock(request->fl_file, request);
4458         if (status < 0)
4459                 goto out;
4460         down_read(&nfsi->rwsem);
4461         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4462                 /* Yes: cache locks! */
4463                 /* ...but avoid races with delegation recall... */
4464                 request->fl_flags = fl_flags & ~FL_SLEEP;
4465                 status = do_vfs_lock(request->fl_file, request);
4466                 goto out_unlock;
4467         }
4468         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4469         if (status != 0)
4470                 goto out_unlock;
4471         /* Note: we always want to sleep here! */
4472         request->fl_flags = fl_flags | FL_SLEEP;
4473         if (do_vfs_lock(request->fl_file, request) < 0)
4474                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4475 out_unlock:
4476         up_read(&nfsi->rwsem);
4477 out:
4478         request->fl_flags = fl_flags;
4479         return status;
4480 }
4481
4482 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4483 {
4484         struct nfs4_exception exception = { };
4485         int err;
4486
4487         do {
4488                 err = _nfs4_proc_setlk(state, cmd, request);
4489                 if (err == -NFS4ERR_DENIED)
4490                         err = -EAGAIN;
4491                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4492                                 err, &exception);
4493         } while (exception.retry);
4494         return err;
4495 }
4496
4497 static int
4498 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4499 {
4500         struct nfs_open_context *ctx;
4501         struct nfs4_state *state;
4502         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4503         int status;
4504
4505         /* verify open state */
4506         ctx = nfs_file_open_context(filp);
4507         state = ctx->state;
4508
4509         if (request->fl_start < 0 || request->fl_end < 0)
4510                 return -EINVAL;
4511
4512         if (IS_GETLK(cmd)) {
4513                 if (state != NULL)
4514                         return nfs4_proc_getlk(state, F_GETLK, request);
4515                 return 0;
4516         }
4517
4518         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4519                 return -EINVAL;
4520
4521         if (request->fl_type == F_UNLCK) {
4522                 if (state != NULL)
4523                         return nfs4_proc_unlck(state, cmd, request);
4524                 return 0;
4525         }
4526
4527         if (state == NULL)
4528                 return -ENOLCK;
4529         do {
4530                 status = nfs4_proc_setlk(state, cmd, request);
4531                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4532                         break;
4533                 timeout = nfs4_set_lock_task_retry(timeout);
4534                 status = -ERESTARTSYS;
4535                 if (signalled())
4536                         break;
4537         } while(status < 0);
4538         return status;
4539 }
4540
4541 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4542 {
4543         struct nfs_server *server = NFS_SERVER(state->inode);
4544         struct nfs4_exception exception = { };
4545         int err;
4546
4547         err = nfs4_set_lock_state(state, fl);
4548         if (err != 0)
4549                 goto out;
4550         do {
4551                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4552                 switch (err) {
4553                         default:
4554                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4555                                                 __func__, err);
4556                         case 0:
4557                         case -ESTALE:
4558                                 goto out;
4559                         case -NFS4ERR_EXPIRED:
4560                                 nfs4_schedule_stateid_recovery(server, state);
4561                         case -NFS4ERR_STALE_CLIENTID:
4562                         case -NFS4ERR_STALE_STATEID:
4563                                 nfs4_schedule_lease_recovery(server->nfs_client);
4564                                 goto out;
4565                         case -NFS4ERR_BADSESSION:
4566                         case -NFS4ERR_BADSLOT:
4567                         case -NFS4ERR_BAD_HIGH_SLOT:
4568                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4569                         case -NFS4ERR_DEADSESSION:
4570                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4571                                 goto out;
4572                         case -ERESTARTSYS:
4573                                 /*
4574                                  * The show must go on: exit, but mark the
4575                                  * stateid as needing recovery.
4576                                  */
4577                         case -NFS4ERR_ADMIN_REVOKED:
4578                         case -NFS4ERR_BAD_STATEID:
4579                         case -NFS4ERR_OPENMODE:
4580                                 nfs4_schedule_stateid_recovery(server, state);
4581                                 err = 0;
4582                                 goto out;
4583                         case -EKEYEXPIRED:
4584                                 /*
4585                                  * User RPCSEC_GSS context has expired.
4586                                  * We cannot recover this stateid now, so
4587                                  * skip it and allow recovery thread to
4588                                  * proceed.
4589                                  */
4590                                 err = 0;
4591                                 goto out;
4592                         case -ENOMEM:
4593                         case -NFS4ERR_DENIED:
4594                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4595                                 err = 0;
4596                                 goto out;
4597                         case -NFS4ERR_DELAY:
4598                                 break;
4599                 }
4600                 err = nfs4_handle_exception(server, err, &exception);
4601         } while (exception.retry);
4602 out:
4603         return err;
4604 }
4605
4606 static void nfs4_release_lockowner_release(void *calldata)
4607 {
4608         kfree(calldata);
4609 }
4610
4611 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4612         .rpc_release = nfs4_release_lockowner_release,
4613 };
4614
4615 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4616 {
4617         struct nfs_server *server = lsp->ls_state->owner->so_server;
4618         struct nfs_release_lockowner_args *args;
4619         struct rpc_message msg = {
4620                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4621         };
4622
4623         if (server->nfs_client->cl_mvops->minor_version != 0)
4624                 return;
4625         args = kmalloc(sizeof(*args), GFP_NOFS);
4626         if (!args)
4627                 return;
4628         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4629         args->lock_owner.id = lsp->ls_id.id;
4630         args->lock_owner.s_dev = server->s_dev;
4631         msg.rpc_argp = args;
4632         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4633 }
4634
4635 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4636
4637 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4638                                    const void *buf, size_t buflen,
4639                                    int flags, int type)
4640 {
4641         if (strcmp(key, "") != 0)
4642                 return -EINVAL;
4643
4644         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4645 }
4646
4647 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4648                                    void *buf, size_t buflen, int type)
4649 {
4650         if (strcmp(key, "") != 0)
4651                 return -EINVAL;
4652
4653         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4654 }
4655
4656 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4657                                        size_t list_len, const char *name,
4658                                        size_t name_len, int type)
4659 {
4660         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4661
4662         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4663                 return 0;
4664
4665         if (list && len <= list_len)
4666                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4667         return len;
4668 }
4669
4670 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4671 {
4672         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4673                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4674                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4675                 return;
4676
4677         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4678                 NFS_ATTR_FATTR_NLINK;
4679         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4680         fattr->nlink = 2;
4681 }
4682
4683 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4684                 struct nfs4_fs_locations *fs_locations, struct page *page)
4685 {
4686         struct nfs_server *server = NFS_SERVER(dir);
4687         u32 bitmask[2] = {
4688                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4689                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4690         };
4691         struct nfs4_fs_locations_arg args = {
4692                 .dir_fh = NFS_FH(dir),
4693                 .name = name,
4694                 .page = page,
4695                 .bitmask = bitmask,
4696         };
4697         struct nfs4_fs_locations_res res = {
4698                 .fs_locations = fs_locations,
4699         };
4700         struct rpc_message msg = {
4701                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4702                 .rpc_argp = &args,
4703                 .rpc_resp = &res,
4704         };
4705         int status;
4706
4707         dprintk("%s: start\n", __func__);
4708         nfs_fattr_init(&fs_locations->fattr);
4709         fs_locations->server = server;
4710         fs_locations->nlocations = 0;
4711         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4712         nfs_fixup_referral_attributes(&fs_locations->fattr);
4713         dprintk("%s: returned status = %d\n", __func__, status);
4714         return status;
4715 }
4716
4717 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4718 {
4719         int status;
4720         struct nfs4_secinfo_arg args = {
4721                 .dir_fh = NFS_FH(dir),
4722                 .name   = name,
4723         };
4724         struct nfs4_secinfo_res res = {
4725                 .flavors     = flavors,
4726         };
4727         struct rpc_message msg = {
4728                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4729                 .rpc_argp = &args,
4730                 .rpc_resp = &res,
4731         };
4732
4733         dprintk("NFS call  secinfo %s\n", name->name);
4734         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4735         dprintk("NFS reply  secinfo: %d\n", status);
4736         return status;
4737 }
4738
4739 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4740 {
4741         struct nfs4_exception exception = { };
4742         int err;
4743         do {
4744                 err = nfs4_handle_exception(NFS_SERVER(dir),
4745                                 _nfs4_proc_secinfo(dir, name, flavors),
4746                                 &exception);
4747         } while (exception.retry);
4748         return err;
4749 }
4750
4751 #ifdef CONFIG_NFS_V4_1
4752 /*
4753  * Check the exchange flags returned by the server for invalid flags, having
4754  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4755  * DS flags set.
4756  */
4757 static int nfs4_check_cl_exchange_flags(u32 flags)
4758 {
4759         if (flags & ~EXCHGID4_FLAG_MASK_R)
4760                 goto out_inval;
4761         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4762             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4763                 goto out_inval;
4764         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4765                 goto out_inval;
4766         return NFS_OK;
4767 out_inval:
4768         return -NFS4ERR_INVAL;
4769 }
4770
4771 /*
4772  * nfs4_proc_exchange_id()
4773  *
4774  * Since the clientid has expired, all compounds using sessions
4775  * associated with the stale clientid will be returning
4776  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4777  * be in some phase of session reset.
4778  */
4779 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4780 {
4781         nfs4_verifier verifier;
4782         struct nfs41_exchange_id_args args = {
4783                 .client = clp,
4784                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4785         };
4786         struct nfs41_exchange_id_res res = {
4787                 .client = clp,
4788         };
4789         int status;
4790         struct rpc_message msg = {
4791                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4792                 .rpc_argp = &args,
4793                 .rpc_resp = &res,
4794                 .rpc_cred = cred,
4795         };
4796         __be32 *p;
4797
4798         dprintk("--> %s\n", __func__);
4799         BUG_ON(clp == NULL);
4800
4801         p = (u32 *)verifier.data;
4802         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4803         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4804         args.verifier = &verifier;
4805
4806         args.id_len = scnprintf(args.id, sizeof(args.id),
4807                                 "%s/%s.%s/%u",
4808                                 clp->cl_ipaddr,
4809                                 init_utsname()->nodename,
4810                                 init_utsname()->domainname,
4811                                 clp->cl_rpcclient->cl_auth->au_flavor);
4812
4813         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4814         if (!status)
4815                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4816         dprintk("<-- %s status= %d\n", __func__, status);
4817         return status;
4818 }
4819
4820 struct nfs4_get_lease_time_data {
4821         struct nfs4_get_lease_time_args *args;
4822         struct nfs4_get_lease_time_res *res;
4823         struct nfs_client *clp;
4824 };
4825
4826 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4827                                         void *calldata)
4828 {
4829         int ret;
4830         struct nfs4_get_lease_time_data *data =
4831                         (struct nfs4_get_lease_time_data *)calldata;
4832
4833         dprintk("--> %s\n", __func__);
4834         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4835         /* just setup sequence, do not trigger session recovery
4836            since we're invoked within one */
4837         ret = nfs41_setup_sequence(data->clp->cl_session,
4838                                    &data->args->la_seq_args,
4839                                    &data->res->lr_seq_res, 0, task);
4840
4841         BUG_ON(ret == -EAGAIN);
4842         rpc_call_start(task);
4843         dprintk("<-- %s\n", __func__);
4844 }
4845
4846 /*
4847  * Called from nfs4_state_manager thread for session setup, so don't recover
4848  * from sequence operation or clientid errors.
4849  */
4850 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4851 {
4852         struct nfs4_get_lease_time_data *data =
4853                         (struct nfs4_get_lease_time_data *)calldata;
4854
4855         dprintk("--> %s\n", __func__);
4856         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4857                 return;
4858         switch (task->tk_status) {
4859         case -NFS4ERR_DELAY:
4860         case -NFS4ERR_GRACE:
4861                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4862                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4863                 task->tk_status = 0;
4864                 /* fall through */
4865         case -NFS4ERR_RETRY_UNCACHED_REP:
4866                 nfs_restart_rpc(task, data->clp);
4867                 return;
4868         }
4869         dprintk("<-- %s\n", __func__);
4870 }
4871
4872 struct rpc_call_ops nfs4_get_lease_time_ops = {
4873         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4874         .rpc_call_done = nfs4_get_lease_time_done,
4875 };
4876
4877 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4878 {
4879         struct rpc_task *task;
4880         struct nfs4_get_lease_time_args args;
4881         struct nfs4_get_lease_time_res res = {
4882                 .lr_fsinfo = fsinfo,
4883         };
4884         struct nfs4_get_lease_time_data data = {
4885                 .args = &args,
4886                 .res = &res,
4887                 .clp = clp,
4888         };
4889         struct rpc_message msg = {
4890                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4891                 .rpc_argp = &args,
4892                 .rpc_resp = &res,
4893         };
4894         struct rpc_task_setup task_setup = {
4895                 .rpc_client = clp->cl_rpcclient,
4896                 .rpc_message = &msg,
4897                 .callback_ops = &nfs4_get_lease_time_ops,
4898                 .callback_data = &data,
4899                 .flags = RPC_TASK_TIMEOUT,
4900         };
4901         int status;
4902
4903         dprintk("--> %s\n", __func__);
4904         task = rpc_run_task(&task_setup);
4905
4906         if (IS_ERR(task))
4907                 status = PTR_ERR(task);
4908         else {
4909                 status = task->tk_status;
4910                 rpc_put_task(task);
4911         }
4912         dprintk("<-- %s return %d\n", __func__, status);
4913
4914         return status;
4915 }
4916
4917 /*
4918  * Reset a slot table
4919  */
4920 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4921                                  int ivalue)
4922 {
4923         struct nfs4_slot *new = NULL;
4924         int i;
4925         int ret = 0;
4926
4927         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4928                 max_reqs, tbl->max_slots);
4929
4930         /* Does the newly negotiated max_reqs match the existing slot table? */
4931         if (max_reqs != tbl->max_slots) {
4932                 ret = -ENOMEM;
4933                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4934                               GFP_NOFS);
4935                 if (!new)
4936                         goto out;
4937                 ret = 0;
4938                 kfree(tbl->slots);
4939         }
4940         spin_lock(&tbl->slot_tbl_lock);
4941         if (new) {
4942                 tbl->slots = new;
4943                 tbl->max_slots = max_reqs;
4944         }
4945         for (i = 0; i < tbl->max_slots; ++i)
4946                 tbl->slots[i].seq_nr = ivalue;
4947         spin_unlock(&tbl->slot_tbl_lock);
4948         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4949                 tbl, tbl->slots, tbl->max_slots);
4950 out:
4951         dprintk("<-- %s: return %d\n", __func__, ret);
4952         return ret;
4953 }
4954
4955 /*
4956  * Reset the forechannel and backchannel slot tables
4957  */
4958 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4959 {
4960         int status;
4961
4962         status = nfs4_reset_slot_table(&session->fc_slot_table,
4963                         session->fc_attrs.max_reqs, 1);
4964         if (status)
4965                 return status;
4966
4967         status = nfs4_reset_slot_table(&session->bc_slot_table,
4968                         session->bc_attrs.max_reqs, 0);
4969         return status;
4970 }
4971
4972 /* Destroy the slot table */
4973 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4974 {
4975         if (session->fc_slot_table.slots != NULL) {
4976                 kfree(session->fc_slot_table.slots);
4977                 session->fc_slot_table.slots = NULL;
4978         }
4979         if (session->bc_slot_table.slots != NULL) {
4980                 kfree(session->bc_slot_table.slots);
4981                 session->bc_slot_table.slots = NULL;
4982         }
4983         return;
4984 }
4985
4986 /*
4987  * Initialize slot table
4988  */
4989 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4990                 int max_slots, int ivalue)
4991 {
4992         struct nfs4_slot *slot;
4993         int ret = -ENOMEM;
4994
4995         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4996
4997         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4998
4999         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5000         if (!slot)
5001                 goto out;
5002         ret = 0;
5003
5004         spin_lock(&tbl->slot_tbl_lock);
5005         tbl->max_slots = max_slots;
5006         tbl->slots = slot;
5007         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5008         spin_unlock(&tbl->slot_tbl_lock);
5009         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5010                 tbl, tbl->slots, tbl->max_slots);
5011 out:
5012         dprintk("<-- %s: return %d\n", __func__, ret);
5013         return ret;
5014 }
5015
5016 /*
5017  * Initialize the forechannel and backchannel tables
5018  */
5019 static int nfs4_init_slot_tables(struct nfs4_session *session)
5020 {
5021         struct nfs4_slot_table *tbl;
5022         int status = 0;
5023
5024         tbl = &session->fc_slot_table;
5025         if (tbl->slots == NULL) {
5026                 status = nfs4_init_slot_table(tbl,
5027                                 session->fc_attrs.max_reqs, 1);
5028                 if (status)
5029                         return status;
5030         }
5031
5032         tbl = &session->bc_slot_table;
5033         if (tbl->slots == NULL) {
5034                 status = nfs4_init_slot_table(tbl,
5035                                 session->bc_attrs.max_reqs, 0);
5036                 if (status)
5037                         nfs4_destroy_slot_tables(session);
5038         }
5039
5040         return status;
5041 }
5042
5043 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5044 {
5045         struct nfs4_session *session;
5046         struct nfs4_slot_table *tbl;
5047
5048         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5049         if (!session)
5050                 return NULL;
5051
5052         tbl = &session->fc_slot_table;
5053         tbl->highest_used_slotid = -1;
5054         spin_lock_init(&tbl->slot_tbl_lock);
5055         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5056         init_completion(&tbl->complete);
5057
5058         tbl = &session->bc_slot_table;
5059         tbl->highest_used_slotid = -1;
5060         spin_lock_init(&tbl->slot_tbl_lock);
5061         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5062         init_completion(&tbl->complete);
5063
5064         session->session_state = 1<<NFS4_SESSION_INITING;
5065
5066         session->clp = clp;
5067         return session;
5068 }
5069
5070 void nfs4_destroy_session(struct nfs4_session *session)
5071 {
5072         nfs4_proc_destroy_session(session);
5073         dprintk("%s Destroy backchannel for xprt %p\n",
5074                 __func__, session->clp->cl_rpcclient->cl_xprt);
5075         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5076                                 NFS41_BC_MIN_CALLBACKS);
5077         nfs4_destroy_slot_tables(session);
5078         kfree(session);
5079 }
5080
5081 /*
5082  * Initialize the values to be used by the client in CREATE_SESSION
5083  * If nfs4_init_session set the fore channel request and response sizes,
5084  * use them.
5085  *
5086  * Set the back channel max_resp_sz_cached to zero to force the client to
5087  * always set csa_cachethis to FALSE because the current implementation
5088  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5089  */
5090 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5091 {
5092         struct nfs4_session *session = args->client->cl_session;
5093         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5094                      mxresp_sz = session->fc_attrs.max_resp_sz;
5095
5096         if (mxrqst_sz == 0)
5097                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5098         if (mxresp_sz == 0)
5099                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5100         /* Fore channel attributes */
5101         args->fc_attrs.headerpadsz = 0;
5102         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5103         args->fc_attrs.max_resp_sz = mxresp_sz;
5104         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5105         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5106
5107         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5108                 "max_ops=%u max_reqs=%u\n",
5109                 __func__,
5110                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5111                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5112
5113         /* Back channel attributes */
5114         args->bc_attrs.headerpadsz = 0;
5115         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5116         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5117         args->bc_attrs.max_resp_sz_cached = 0;
5118         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5119         args->bc_attrs.max_reqs = 1;
5120
5121         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5122                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5123                 __func__,
5124                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5125                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5126                 args->bc_attrs.max_reqs);
5127 }
5128
5129 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5130 {
5131         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5132         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5133
5134         if (rcvd->headerpadsz > sent->headerpadsz)
5135                 return -EINVAL;
5136         if (rcvd->max_resp_sz > sent->max_resp_sz)
5137                 return -EINVAL;
5138         /*
5139          * Our requested max_ops is the minimum we need; we're not
5140          * prepared to break up compounds into smaller pieces than that.
5141          * So, no point even trying to continue if the server won't
5142          * cooperate:
5143          */
5144         if (rcvd->max_ops < sent->max_ops)
5145                 return -EINVAL;
5146         if (rcvd->max_reqs == 0)
5147                 return -EINVAL;
5148         return 0;
5149 }
5150
5151 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5152 {
5153         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5154         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5155
5156         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5157                 return -EINVAL;
5158         if (rcvd->max_resp_sz < sent->max_resp_sz)
5159                 return -EINVAL;
5160         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5161                 return -EINVAL;
5162         /* These would render the backchannel useless: */
5163         if (rcvd->max_ops  == 0)
5164                 return -EINVAL;
5165         if (rcvd->max_reqs == 0)
5166                 return -EINVAL;
5167         return 0;
5168 }
5169
5170 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5171                                      struct nfs4_session *session)
5172 {
5173         int ret;
5174
5175         ret = nfs4_verify_fore_channel_attrs(args, session);
5176         if (ret)
5177                 return ret;
5178         return nfs4_verify_back_channel_attrs(args, session);
5179 }
5180
5181 static int _nfs4_proc_create_session(struct nfs_client *clp)
5182 {
5183         struct nfs4_session *session = clp->cl_session;
5184         struct nfs41_create_session_args args = {
5185                 .client = clp,
5186                 .cb_program = NFS4_CALLBACK,
5187         };
5188         struct nfs41_create_session_res res = {
5189                 .client = clp,
5190         };
5191         struct rpc_message msg = {
5192                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5193                 .rpc_argp = &args,
5194                 .rpc_resp = &res,
5195         };
5196         int status;
5197
5198         nfs4_init_channel_attrs(&args);
5199         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5200
5201         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5202
5203         if (!status)
5204                 /* Verify the session's negotiated channel_attrs values */
5205                 status = nfs4_verify_channel_attrs(&args, session);
5206         if (!status) {
5207                 /* Increment the clientid slot sequence id */
5208                 clp->cl_seqid++;
5209         }
5210
5211         return status;
5212 }
5213
5214 /*
5215  * Issues a CREATE_SESSION operation to the server.
5216  * It is the responsibility of the caller to verify the session is
5217  * expired before calling this routine.
5218  */
5219 int nfs4_proc_create_session(struct nfs_client *clp)
5220 {
5221         int status;
5222         unsigned *ptr;
5223         struct nfs4_session *session = clp->cl_session;
5224
5225         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5226
5227         status = _nfs4_proc_create_session(clp);
5228         if (status)
5229                 goto out;
5230
5231         /* Init and reset the fore channel */
5232         status = nfs4_init_slot_tables(session);
5233         dprintk("slot table initialization returned %d\n", status);
5234         if (status)
5235                 goto out;
5236         status = nfs4_reset_slot_tables(session);
5237         dprintk("slot table reset returned %d\n", status);
5238         if (status)
5239                 goto out;
5240
5241         ptr = (unsigned *)&session->sess_id.data[0];
5242         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5243                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5244 out:
5245         dprintk("<-- %s\n", __func__);
5246         return status;
5247 }
5248
5249 /*
5250  * Issue the over-the-wire RPC DESTROY_SESSION.
5251  * The caller must serialize access to this routine.
5252  */
5253 int nfs4_proc_destroy_session(struct nfs4_session *session)
5254 {
5255         int status = 0;
5256         struct rpc_message msg;
5257
5258         dprintk("--> nfs4_proc_destroy_session\n");
5259
5260         /* session is still being setup */
5261         if (session->clp->cl_cons_state != NFS_CS_READY)
5262                 return status;
5263
5264         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5265         msg.rpc_argp = session;
5266         msg.rpc_resp = NULL;
5267         msg.rpc_cred = NULL;
5268         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5269
5270         if (status)
5271                 printk(KERN_WARNING
5272                         "Got error %d from the server on DESTROY_SESSION. "
5273                         "Session has been destroyed regardless...\n", status);
5274
5275         dprintk("<-- nfs4_proc_destroy_session\n");
5276         return status;
5277 }
5278
5279 int nfs4_init_session(struct nfs_server *server)
5280 {
5281         struct nfs_client *clp = server->nfs_client;
5282         struct nfs4_session *session;
5283         unsigned int rsize, wsize;
5284         int ret;
5285
5286         if (!nfs4_has_session(clp))
5287                 return 0;
5288
5289         session = clp->cl_session;
5290         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5291                 return 0;
5292
5293         rsize = server->rsize;
5294         if (rsize == 0)
5295                 rsize = NFS_MAX_FILE_IO_SIZE;
5296         wsize = server->wsize;
5297         if (wsize == 0)
5298                 wsize = NFS_MAX_FILE_IO_SIZE;
5299
5300         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5301         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5302
5303         ret = nfs4_recover_expired_lease(server);
5304         if (!ret)
5305                 ret = nfs4_check_client_ready(clp);
5306         return ret;
5307 }
5308
5309 int nfs4_init_ds_session(struct nfs_client *clp)
5310 {
5311         struct nfs4_session *session = clp->cl_session;
5312         int ret;
5313
5314         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5315                 return 0;
5316
5317         ret = nfs4_client_recover_expired_lease(clp);
5318         if (!ret)
5319                 /* Test for the DS role */
5320                 if (!is_ds_client(clp))
5321                         ret = -ENODEV;
5322         if (!ret)
5323                 ret = nfs4_check_client_ready(clp);
5324         return ret;
5325
5326 }
5327 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5328
5329
5330 /*
5331  * Renew the cl_session lease.
5332  */
5333 struct nfs4_sequence_data {
5334         struct nfs_client *clp;
5335         struct nfs4_sequence_args args;
5336         struct nfs4_sequence_res res;
5337 };
5338
5339 static void nfs41_sequence_release(void *data)
5340 {
5341         struct nfs4_sequence_data *calldata = data;
5342         struct nfs_client *clp = calldata->clp;
5343
5344         if (atomic_read(&clp->cl_count) > 1)
5345                 nfs4_schedule_state_renewal(clp);
5346         nfs_put_client(clp);
5347         kfree(calldata);
5348 }
5349
5350 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5351 {
5352         switch(task->tk_status) {
5353         case -NFS4ERR_DELAY:
5354                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5355                 return -EAGAIN;
5356         default:
5357                 nfs4_schedule_lease_recovery(clp);
5358         }
5359         return 0;
5360 }
5361
5362 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5363 {
5364         struct nfs4_sequence_data *calldata = data;
5365         struct nfs_client *clp = calldata->clp;
5366
5367         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5368                 return;
5369
5370         if (task->tk_status < 0) {
5371                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5372                 if (atomic_read(&clp->cl_count) == 1)
5373                         goto out;
5374
5375                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5376                         rpc_restart_call_prepare(task);
5377                         return;
5378                 }
5379         }
5380         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5381 out:
5382         dprintk("<-- %s\n", __func__);
5383 }
5384
5385 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5386 {
5387         struct nfs4_sequence_data *calldata = data;
5388         struct nfs_client *clp = calldata->clp;
5389         struct nfs4_sequence_args *args;
5390         struct nfs4_sequence_res *res;
5391
5392         args = task->tk_msg.rpc_argp;
5393         res = task->tk_msg.rpc_resp;
5394
5395         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5396                 return;
5397         rpc_call_start(task);
5398 }
5399
5400 static const struct rpc_call_ops nfs41_sequence_ops = {
5401         .rpc_call_done = nfs41_sequence_call_done,
5402         .rpc_call_prepare = nfs41_sequence_prepare,
5403         .rpc_release = nfs41_sequence_release,
5404 };
5405
5406 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5407 {
5408         struct nfs4_sequence_data *calldata;
5409         struct rpc_message msg = {
5410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5411                 .rpc_cred = cred,
5412         };
5413         struct rpc_task_setup task_setup_data = {
5414                 .rpc_client = clp->cl_rpcclient,
5415                 .rpc_message = &msg,
5416                 .callback_ops = &nfs41_sequence_ops,
5417                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5418         };
5419
5420         if (!atomic_inc_not_zero(&clp->cl_count))
5421                 return ERR_PTR(-EIO);
5422         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5423         if (calldata == NULL) {
5424                 nfs_put_client(clp);
5425                 return ERR_PTR(-ENOMEM);
5426         }
5427         msg.rpc_argp = &calldata->args;
5428         msg.rpc_resp = &calldata->res;
5429         calldata->clp = clp;
5430         task_setup_data.callback_data = calldata;
5431
5432         return rpc_run_task(&task_setup_data);
5433 }
5434
5435 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5436 {
5437         struct rpc_task *task;
5438         int ret = 0;
5439
5440         task = _nfs41_proc_sequence(clp, cred);
5441         if (IS_ERR(task))
5442                 ret = PTR_ERR(task);
5443         else
5444                 rpc_put_task_async(task);
5445         dprintk("<-- %s status=%d\n", __func__, ret);
5446         return ret;
5447 }
5448
5449 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5450 {
5451         struct rpc_task *task;
5452         int ret;
5453
5454         task = _nfs41_proc_sequence(clp, cred);
5455         if (IS_ERR(task)) {
5456                 ret = PTR_ERR(task);
5457                 goto out;
5458         }
5459         ret = rpc_wait_for_completion_task(task);
5460         if (!ret) {
5461                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5462
5463                 if (task->tk_status == 0)
5464                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5465                 ret = task->tk_status;
5466         }
5467         rpc_put_task(task);
5468 out:
5469         dprintk("<-- %s status=%d\n", __func__, ret);
5470         return ret;
5471 }
5472
5473 struct nfs4_reclaim_complete_data {
5474         struct nfs_client *clp;
5475         struct nfs41_reclaim_complete_args arg;
5476         struct nfs41_reclaim_complete_res res;
5477 };
5478
5479 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5480 {
5481         struct nfs4_reclaim_complete_data *calldata = data;
5482
5483         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5484         if (nfs41_setup_sequence(calldata->clp->cl_session,
5485                                 &calldata->arg.seq_args,
5486                                 &calldata->res.seq_res, 0, task))
5487                 return;
5488
5489         rpc_call_start(task);
5490 }
5491
5492 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5493 {
5494         switch(task->tk_status) {
5495         case 0:
5496         case -NFS4ERR_COMPLETE_ALREADY:
5497         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5498                 break;
5499         case -NFS4ERR_DELAY:
5500                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5501                 /* fall through */
5502         case -NFS4ERR_RETRY_UNCACHED_REP:
5503                 return -EAGAIN;
5504         default:
5505                 nfs4_schedule_lease_recovery(clp);
5506         }
5507         return 0;
5508 }
5509
5510 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5511 {
5512         struct nfs4_reclaim_complete_data *calldata = data;
5513         struct nfs_client *clp = calldata->clp;
5514         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5515
5516         dprintk("--> %s\n", __func__);
5517         if (!nfs41_sequence_done(task, res))
5518                 return;
5519
5520         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5521                 rpc_restart_call_prepare(task);
5522                 return;
5523         }
5524         dprintk("<-- %s\n", __func__);
5525 }
5526
5527 static void nfs4_free_reclaim_complete_data(void *data)
5528 {
5529         struct nfs4_reclaim_complete_data *calldata = data;
5530
5531         kfree(calldata);
5532 }
5533
5534 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5535         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5536         .rpc_call_done = nfs4_reclaim_complete_done,
5537         .rpc_release = nfs4_free_reclaim_complete_data,
5538 };
5539
5540 /*
5541  * Issue a global reclaim complete.
5542  */
5543 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5544 {
5545         struct nfs4_reclaim_complete_data *calldata;
5546         struct rpc_task *task;
5547         struct rpc_message msg = {
5548                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5549         };
5550         struct rpc_task_setup task_setup_data = {
5551                 .rpc_client = clp->cl_rpcclient,
5552                 .rpc_message = &msg,
5553                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5554                 .flags = RPC_TASK_ASYNC,
5555         };
5556         int status = -ENOMEM;
5557
5558         dprintk("--> %s\n", __func__);
5559         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5560         if (calldata == NULL)
5561                 goto out;
5562         calldata->clp = clp;
5563         calldata->arg.one_fs = 0;
5564
5565         msg.rpc_argp = &calldata->arg;
5566         msg.rpc_resp = &calldata->res;
5567         task_setup_data.callback_data = calldata;
5568         task = rpc_run_task(&task_setup_data);
5569         if (IS_ERR(task)) {
5570                 status = PTR_ERR(task);
5571                 goto out;
5572         }
5573         status = nfs4_wait_for_completion_rpc_task(task);
5574         if (status == 0)
5575                 status = task->tk_status;
5576         rpc_put_task(task);
5577         return 0;
5578 out:
5579         dprintk("<-- %s status=%d\n", __func__, status);
5580         return status;
5581 }
5582
5583 static void
5584 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5585 {
5586         struct nfs4_layoutget *lgp = calldata;
5587         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5588
5589         dprintk("--> %s\n", __func__);
5590         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5591          * right now covering the LAYOUTGET we are about to send.
5592          * However, that is not so catastrophic, and there seems
5593          * to be no way to prevent it completely.
5594          */
5595         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5596                                 &lgp->res.seq_res, 0, task))
5597                 return;
5598         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5599                                           NFS_I(lgp->args.inode)->layout,
5600                                           lgp->args.ctx->state)) {
5601                 rpc_exit(task, NFS4_OK);
5602                 return;
5603         }
5604         rpc_call_start(task);
5605 }
5606
5607 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5608 {
5609         struct nfs4_layoutget *lgp = calldata;
5610         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5611
5612         dprintk("--> %s\n", __func__);
5613
5614         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5615                 return;
5616
5617         switch (task->tk_status) {
5618         case 0:
5619                 break;
5620         case -NFS4ERR_LAYOUTTRYLATER:
5621         case -NFS4ERR_RECALLCONFLICT:
5622                 task->tk_status = -NFS4ERR_DELAY;
5623                 /* Fall through */
5624         default:
5625                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5626                         rpc_restart_call_prepare(task);
5627                         return;
5628                 }
5629         }
5630         dprintk("<-- %s\n", __func__);
5631 }
5632
5633 static void nfs4_layoutget_release(void *calldata)
5634 {
5635         struct nfs4_layoutget *lgp = calldata;
5636
5637         dprintk("--> %s\n", __func__);
5638         put_nfs_open_context(lgp->args.ctx);
5639         kfree(calldata);
5640         dprintk("<-- %s\n", __func__);
5641 }
5642
5643 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5644         .rpc_call_prepare = nfs4_layoutget_prepare,
5645         .rpc_call_done = nfs4_layoutget_done,
5646         .rpc_release = nfs4_layoutget_release,
5647 };
5648
5649 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5650 {
5651         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5652         struct rpc_task *task;
5653         struct rpc_message msg = {
5654                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5655                 .rpc_argp = &lgp->args,
5656                 .rpc_resp = &lgp->res,
5657         };
5658         struct rpc_task_setup task_setup_data = {
5659                 .rpc_client = server->client,
5660                 .rpc_message = &msg,
5661                 .callback_ops = &nfs4_layoutget_call_ops,
5662                 .callback_data = lgp,
5663                 .flags = RPC_TASK_ASYNC,
5664         };
5665         int status = 0;
5666
5667         dprintk("--> %s\n", __func__);
5668
5669         lgp->res.layoutp = &lgp->args.layout;
5670         lgp->res.seq_res.sr_slot = NULL;
5671         task = rpc_run_task(&task_setup_data);
5672         if (IS_ERR(task))
5673                 return PTR_ERR(task);
5674         status = nfs4_wait_for_completion_rpc_task(task);
5675         if (status == 0)
5676                 status = task->tk_status;
5677         if (status == 0)
5678                 status = pnfs_layout_process(lgp);
5679         rpc_put_task(task);
5680         dprintk("<-- %s status=%d\n", __func__, status);
5681         return status;
5682 }
5683
5684 static void
5685 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5686 {
5687         struct nfs4_layoutreturn *lrp = calldata;
5688
5689         dprintk("--> %s\n", __func__);
5690         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5691                                 &lrp->res.seq_res, 0, task))
5692                 return;
5693         rpc_call_start(task);
5694 }
5695
5696 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5697 {
5698         struct nfs4_layoutreturn *lrp = calldata;
5699         struct nfs_server *server;
5700
5701         dprintk("--> %s\n", __func__);
5702
5703         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5704                 return;
5705
5706         server = NFS_SERVER(lrp->args.inode);
5707         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5708                 nfs_restart_rpc(task, lrp->clp);
5709                 return;
5710         }
5711         if (task->tk_status == 0) {
5712                 struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
5713
5714                 if (lrp->res.lrs_present) {
5715                         spin_lock(&lo->plh_inode->i_lock);
5716                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5717                         spin_unlock(&lo->plh_inode->i_lock);
5718                 } else
5719                         BUG_ON(!list_empty(&lo->plh_segs));
5720         }
5721         dprintk("<-- %s\n", __func__);
5722 }
5723
5724 static void nfs4_layoutreturn_release(void *calldata)
5725 {
5726         struct nfs4_layoutreturn *lrp = calldata;
5727
5728         dprintk("--> %s\n", __func__);
5729         put_layout_hdr(NFS_I(lrp->args.inode)->layout);
5730         kfree(calldata);
5731         dprintk("<-- %s\n", __func__);
5732 }
5733
5734 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5735         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5736         .rpc_call_done = nfs4_layoutreturn_done,
5737         .rpc_release = nfs4_layoutreturn_release,
5738 };
5739
5740 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5741 {
5742         struct rpc_task *task;
5743         struct rpc_message msg = {
5744                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5745                 .rpc_argp = &lrp->args,
5746                 .rpc_resp = &lrp->res,
5747         };
5748         struct rpc_task_setup task_setup_data = {
5749                 .rpc_client = lrp->clp->cl_rpcclient,
5750                 .rpc_message = &msg,
5751                 .callback_ops = &nfs4_layoutreturn_call_ops,
5752                 .callback_data = lrp,
5753         };
5754         int status;
5755
5756         dprintk("--> %s\n", __func__);
5757         task = rpc_run_task(&task_setup_data);
5758         if (IS_ERR(task))
5759                 return PTR_ERR(task);
5760         status = task->tk_status;
5761         dprintk("<-- %s status=%d\n", __func__, status);
5762         rpc_put_task(task);
5763         return status;
5764 }
5765
5766 static int
5767 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5768 {
5769         struct nfs4_getdeviceinfo_args args = {
5770                 .pdev = pdev,
5771         };
5772         struct nfs4_getdeviceinfo_res res = {
5773                 .pdev = pdev,
5774         };
5775         struct rpc_message msg = {
5776                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5777                 .rpc_argp = &args,
5778                 .rpc_resp = &res,
5779         };
5780         int status;
5781
5782         dprintk("--> %s\n", __func__);
5783         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5784         dprintk("<-- %s status=%d\n", __func__, status);
5785
5786         return status;
5787 }
5788
5789 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5790 {
5791         struct nfs4_exception exception = { };
5792         int err;
5793
5794         do {
5795                 err = nfs4_handle_exception(server,
5796                                         _nfs4_proc_getdeviceinfo(server, pdev),
5797                                         &exception);
5798         } while (exception.retry);
5799         return err;
5800 }
5801 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5802
5803 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5804 {
5805         struct nfs4_layoutcommit_data *data = calldata;
5806         struct nfs_server *server = NFS_SERVER(data->args.inode);
5807
5808         if (nfs4_setup_sequence(server, &data->args.seq_args,
5809                                 &data->res.seq_res, 1, task))
5810                 return;
5811         rpc_call_start(task);
5812 }
5813
5814 static void
5815 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5816 {
5817         struct nfs4_layoutcommit_data *data = calldata;
5818         struct nfs_server *server = NFS_SERVER(data->args.inode);
5819
5820         if (!nfs4_sequence_done(task, &data->res.seq_res))
5821                 return;
5822
5823         switch (task->tk_status) { /* Just ignore these failures */
5824         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5825         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5826         case NFS4ERR_BADLAYOUT:     /* no layout */
5827         case NFS4ERR_GRACE:         /* loca_recalim always false */
5828                 task->tk_status = 0;
5829         }
5830
5831         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5832                 nfs_restart_rpc(task, server->nfs_client);
5833                 return;
5834         }
5835
5836         if (task->tk_status == 0)
5837                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5838                                                    data->res.fattr);
5839 }
5840
5841 static void nfs4_layoutcommit_release(void *calldata)
5842 {
5843         struct nfs4_layoutcommit_data *data = calldata;
5844
5845         /* Matched by references in pnfs_set_layoutcommit */
5846         put_lseg(data->lseg);
5847         put_rpccred(data->cred);
5848         kfree(data);
5849 }
5850
5851 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5852         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5853         .rpc_call_done = nfs4_layoutcommit_done,
5854         .rpc_release = nfs4_layoutcommit_release,
5855 };
5856
5857 int
5858 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5859 {
5860         struct rpc_message msg = {
5861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5862                 .rpc_argp = &data->args,
5863                 .rpc_resp = &data->res,
5864                 .rpc_cred = data->cred,
5865         };
5866         struct rpc_task_setup task_setup_data = {
5867                 .task = &data->task,
5868                 .rpc_client = NFS_CLIENT(data->args.inode),
5869                 .rpc_message = &msg,
5870                 .callback_ops = &nfs4_layoutcommit_ops,
5871                 .callback_data = data,
5872                 .flags = RPC_TASK_ASYNC,
5873         };
5874         struct rpc_task *task;
5875         int status = 0;
5876
5877         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5878                 "lbw: %llu inode %lu\n",
5879                 data->task.tk_pid, sync,
5880                 data->args.lastbytewritten,
5881                 data->args.inode->i_ino);
5882
5883         task = rpc_run_task(&task_setup_data);
5884         if (IS_ERR(task))
5885                 return PTR_ERR(task);
5886         if (sync == false)
5887                 goto out;
5888         status = nfs4_wait_for_completion_rpc_task(task);
5889         if (status != 0)
5890                 goto out;
5891         status = task->tk_status;
5892 out:
5893         dprintk("%s: status %d\n", __func__, status);
5894         rpc_put_task(task);
5895         return status;
5896 }
5897 #endif /* CONFIG_NFS_V4_1 */
5898
5899 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5900         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5901         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5902         .recover_open   = nfs4_open_reclaim,
5903         .recover_lock   = nfs4_lock_reclaim,
5904         .establish_clid = nfs4_init_clientid,
5905         .get_clid_cred  = nfs4_get_setclientid_cred,
5906 };
5907
5908 #if defined(CONFIG_NFS_V4_1)
5909 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5910         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5911         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5912         .recover_open   = nfs4_open_reclaim,
5913         .recover_lock   = nfs4_lock_reclaim,
5914         .establish_clid = nfs41_init_clientid,
5915         .get_clid_cred  = nfs4_get_exchange_id_cred,
5916         .reclaim_complete = nfs41_proc_reclaim_complete,
5917 };
5918 #endif /* CONFIG_NFS_V4_1 */
5919
5920 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5921         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5922         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5923         .recover_open   = nfs4_open_expired,
5924         .recover_lock   = nfs4_lock_expired,
5925         .establish_clid = nfs4_init_clientid,
5926         .get_clid_cred  = nfs4_get_setclientid_cred,
5927 };
5928
5929 #if defined(CONFIG_NFS_V4_1)
5930 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5931         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5932         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5933         .recover_open   = nfs4_open_expired,
5934         .recover_lock   = nfs4_lock_expired,
5935         .establish_clid = nfs41_init_clientid,
5936         .get_clid_cred  = nfs4_get_exchange_id_cred,
5937 };
5938 #endif /* CONFIG_NFS_V4_1 */
5939
5940 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5941         .sched_state_renewal = nfs4_proc_async_renew,
5942         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5943         .renew_lease = nfs4_proc_renew,
5944 };
5945
5946 #if defined(CONFIG_NFS_V4_1)
5947 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5948         .sched_state_renewal = nfs41_proc_async_sequence,
5949         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5950         .renew_lease = nfs4_proc_sequence,
5951 };
5952 #endif
5953
5954 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5955         .minor_version = 0,
5956         .call_sync = _nfs4_call_sync,
5957         .validate_stateid = nfs4_validate_delegation_stateid,
5958         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5959         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5960         .state_renewal_ops = &nfs40_state_renewal_ops,
5961 };
5962
5963 #if defined(CONFIG_NFS_V4_1)
5964 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5965         .minor_version = 1,
5966         .call_sync = _nfs4_call_sync_session,
5967         .validate_stateid = nfs41_validate_delegation_stateid,
5968         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5969         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5970         .state_renewal_ops = &nfs41_state_renewal_ops,
5971 };
5972 #endif
5973
5974 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5975         [0] = &nfs_v4_0_minor_ops,
5976 #if defined(CONFIG_NFS_V4_1)
5977         [1] = &nfs_v4_1_minor_ops,
5978 #endif
5979 };
5980
5981 static const struct inode_operations nfs4_file_inode_operations = {
5982         .permission     = nfs_permission,
5983         .getattr        = nfs_getattr,
5984         .setattr        = nfs_setattr,
5985         .getxattr       = generic_getxattr,
5986         .setxattr       = generic_setxattr,
5987         .listxattr      = generic_listxattr,
5988         .removexattr    = generic_removexattr,
5989 };
5990
5991 const struct nfs_rpc_ops nfs_v4_clientops = {
5992         .version        = 4,                    /* protocol version */
5993         .dentry_ops     = &nfs4_dentry_operations,
5994         .dir_inode_ops  = &nfs4_dir_inode_operations,
5995         .file_inode_ops = &nfs4_file_inode_operations,
5996         .getroot        = nfs4_proc_get_root,
5997         .getattr        = nfs4_proc_getattr,
5998         .setattr        = nfs4_proc_setattr,
5999         .lookupfh       = nfs4_proc_lookupfh,
6000         .lookup         = nfs4_proc_lookup,
6001         .access         = nfs4_proc_access,
6002         .readlink       = nfs4_proc_readlink,
6003         .create         = nfs4_proc_create,
6004         .remove         = nfs4_proc_remove,
6005         .unlink_setup   = nfs4_proc_unlink_setup,
6006         .unlink_done    = nfs4_proc_unlink_done,
6007         .rename         = nfs4_proc_rename,
6008         .rename_setup   = nfs4_proc_rename_setup,
6009         .rename_done    = nfs4_proc_rename_done,
6010         .link           = nfs4_proc_link,
6011         .symlink        = nfs4_proc_symlink,
6012         .mkdir          = nfs4_proc_mkdir,
6013         .rmdir          = nfs4_proc_remove,
6014         .readdir        = nfs4_proc_readdir,
6015         .mknod          = nfs4_proc_mknod,
6016         .statfs         = nfs4_proc_statfs,
6017         .fsinfo         = nfs4_proc_fsinfo,
6018         .pathconf       = nfs4_proc_pathconf,
6019         .set_capabilities = nfs4_server_capabilities,
6020         .decode_dirent  = nfs4_decode_dirent,
6021         .read_setup     = nfs4_proc_read_setup,
6022         .read_done      = nfs4_read_done,
6023         .write_setup    = nfs4_proc_write_setup,
6024         .write_done     = nfs4_write_done,
6025         .commit_setup   = nfs4_proc_commit_setup,
6026         .commit_done    = nfs4_commit_done,
6027         .lock           = nfs4_proc_lock,
6028         .clear_acl_cache = nfs4_zap_acl_attr,
6029         .close_context  = nfs4_close_context,
6030         .open_context   = nfs4_atomic_open,
6031         .init_client    = nfs4_init_client,
6032         .secinfo        = nfs4_proc_secinfo,
6033 };
6034
6035 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6036         .prefix = XATTR_NAME_NFSV4_ACL,
6037         .list   = nfs4_xattr_list_nfs4_acl,
6038         .get    = nfs4_xattr_get_nfs4_acl,
6039         .set    = nfs4_xattr_set_nfs4_acl,
6040 };
6041
6042 const struct xattr_handler *nfs4_xattr_handlers[] = {
6043         &nfs4_xattr_nfs4_acl_handler,
6044         NULL
6045 };
6046
6047 /*
6048  * Local variables:
6049  *  c-basic-offset: 8
6050  * End:
6051  */