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/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58 #include "pnfs.h"
  59
  60 #define NFSDBG_FACILITY         NFSDBG_PROC
  61
  62 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  63 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  64
  65 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  66
  67 struct nfs4_opendata;
  68 static int _nfs4_proc_open(struct nfs4_opendata *data);
  69 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  70 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  71 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  72 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  74 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  75                             struct nfs_fattr *fattr, struct iattr *sattr,
  76                             struct nfs4_state *state);
  77
  78 /* Prevent leaks of NFSv4 errors into userland */
  79 static int nfs4_map_errors(int err)
  80 {
  81         if (err >= -1000)
  82                 return err;
  83         switch (err) {
  84         case -NFS4ERR_RESOURCE:
  85                 return -EREMOTEIO;
  86         default:
  87                 dprintk("%s could not handle NFSv4 error %d\n",
  88                                 __func__, -err);
  89                 break;
  90         }
  91         return -EIO;
  92 }
  93
  94 /*
  95  * This is our standard bitmap for GETATTR requests.
  96  */
  97 const u32 nfs4_fattr_bitmap[2] = {
  98         FATTR4_WORD0_TYPE
  99         | FATTR4_WORD0_CHANGE
 100         | FATTR4_WORD0_SIZE
 101         | FATTR4_WORD0_FSID
 102         | FATTR4_WORD0_FILEID,
 103         FATTR4_WORD1_MODE
 104         | FATTR4_WORD1_NUMLINKS
 105         | FATTR4_WORD1_OWNER
 106         | FATTR4_WORD1_OWNER_GROUP
 107         | FATTR4_WORD1_RAWDEV
 108         | FATTR4_WORD1_SPACE_USED
 109         | FATTR4_WORD1_TIME_ACCESS
 110         | FATTR4_WORD1_TIME_METADATA
 111         | FATTR4_WORD1_TIME_MODIFY
 112 };
 113
 114 const u32 nfs4_statfs_bitmap[2] = {
 115         FATTR4_WORD0_FILES_AVAIL
 116         | FATTR4_WORD0_FILES_FREE
 117         | FATTR4_WORD0_FILES_TOTAL,
 118         FATTR4_WORD1_SPACE_AVAIL
 119         | FATTR4_WORD1_SPACE_FREE
 120         | FATTR4_WORD1_SPACE_TOTAL
 121 };
 122
 123 const u32 nfs4_pathconf_bitmap[2] = {
 124         FATTR4_WORD0_MAXLINK
 125         | FATTR4_WORD0_MAXNAME,
 126         0
 127 };
 128
 129 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 130                         | FATTR4_WORD0_MAXREAD
 131                         | FATTR4_WORD0_MAXWRITE
 132                         | FATTR4_WORD0_LEASE_TIME,
 133                         FATTR4_WORD1_TIME_DELTA
 134                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 135 };
 136
 137 const u32 nfs4_fs_locations_bitmap[2] = {
 138         FATTR4_WORD0_TYPE
 139         | FATTR4_WORD0_CHANGE
 140         | FATTR4_WORD0_SIZE
 141         | FATTR4_WORD0_FSID
 142         | FATTR4_WORD0_FILEID
 143         | FATTR4_WORD0_FS_LOCATIONS,
 144         FATTR4_WORD1_MODE
 145         | FATTR4_WORD1_NUMLINKS
 146         | FATTR4_WORD1_OWNER
 147         | FATTR4_WORD1_OWNER_GROUP
 148         | FATTR4_WORD1_RAWDEV
 149         | FATTR4_WORD1_SPACE_USED
 150         | FATTR4_WORD1_TIME_ACCESS
 151         | FATTR4_WORD1_TIME_METADATA
 152         | FATTR4_WORD1_TIME_MODIFY
 153         | FATTR4_WORD1_MOUNTED_ON_FILEID
 154 };
 155
 156 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 157                 struct nfs4_readdir_arg *readdir)
 158 {
 159         __be32 *start, *p;
 160
 161         BUG_ON(readdir->count < 80);
 162         if (cookie > 2) {
 163                 readdir->cookie = cookie;
 164                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 165                 return;
 166         }
 167
 168         readdir->cookie = 0;
 169         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 170         if (cookie == 2)
 171                 return;
 172
 173         /*
 174          * NFSv4 servers do not return entries for '.' and '..'
 175          * Therefore, we fake these entries here.  We let '.'
 176          * have cookie 0 and '..' have cookie 1.  Note that
 177          * when talking to the server, we always send cookie 0
 178          * instead of 1 or 2.
 179          */
 180         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 181
 182         if (cookie == 0) {
 183                 *p++ = xdr_one;                                  /* next */
 184                 *p++ = xdr_zero;                   /* cookie, first word */
 185                 *p++ = xdr_one;                   /* cookie, second word */
 186                 *p++ = xdr_one;                             /* entry len */
 187                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 188                 p++;
 189                 *p++ = xdr_one;                         /* bitmap length */
 190                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 191                 *p++ = htonl(8);              /* attribute buffer length */
 192                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 193         }
 194
 195         *p++ = xdr_one;                                  /* next */
 196         *p++ = xdr_zero;                   /* cookie, first word */
 197         *p++ = xdr_two;                   /* cookie, second word */
 198         *p++ = xdr_two;                             /* entry len */
 199         memcpy(p, "..\0\0", 4);                         /* entry */
 200         p++;
 201         *p++ = xdr_one;                         /* bitmap length */
 202         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 203         *p++ = htonl(8);              /* attribute buffer length */
 204         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 205
 206         readdir->pgbase = (char *)p - (char *)start;
 207         readdir->count -= readdir->pgbase;
 208         kunmap_atomic(start, KM_USER0);
 209 }
 210
 211 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 212 {
 213         int res;
 214
 215         might_sleep();
 216
 217         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 218                         nfs_wait_bit_killable, TASK_KILLABLE);
 219         return res;
 220 }
 221
 222 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 223 {
 224         int res = 0;
 225
 226         might_sleep();
 227
 228         if (*timeout <= 0)
 229                 *timeout = NFS4_POLL_RETRY_MIN;
 230         if (*timeout > NFS4_POLL_RETRY_MAX)
 231                 *timeout = NFS4_POLL_RETRY_MAX;
 232         schedule_timeout_killable(*timeout);
 233         if (fatal_signal_pending(current))
 234                 res = -ERESTARTSYS;
 235         *timeout <<= 1;
 236         return res;
 237 }
 238
 239 /* This is the error handling routine for processes that are allowed
 240  * to sleep.
 241  */
 242 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 243 {
 244         struct nfs_client *clp = server->nfs_client;
 245         struct nfs4_state *state = exception->state;
 246         int ret = errorcode;
 247
 248         exception->retry = 0;
 249         switch(errorcode) {
 250                 case 0:
 251                         return 0;
 252                 case -NFS4ERR_ADMIN_REVOKED:
 253                 case -NFS4ERR_BAD_STATEID:
 254                 case -NFS4ERR_OPENMODE:
 255                         if (state == NULL)
 256                                 break;
 257                         nfs4_state_mark_reclaim_nograce(clp, state);
 258                         goto do_state_recovery;
 259                 case -NFS4ERR_STALE_STATEID:
 260                 case -NFS4ERR_STALE_CLIENTID:
 261                 case -NFS4ERR_EXPIRED:
 262                         goto do_state_recovery;
 263 #if defined(CONFIG_NFS_V4_1)
 264                 case -NFS4ERR_BADSESSION:
 265                 case -NFS4ERR_BADSLOT:
 266                 case -NFS4ERR_BAD_HIGH_SLOT:
 267                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 268                 case -NFS4ERR_DEADSESSION:
 269                 case -NFS4ERR_SEQ_FALSE_RETRY:
 270                 case -NFS4ERR_SEQ_MISORDERED:
 271                         dprintk("%s ERROR: %d Reset session\n", __func__,
 272                                 errorcode);
 273                         nfs4_schedule_state_recovery(clp);
 274                         exception->retry = 1;
 275                         break;
 276 #endif /* defined(CONFIG_NFS_V4_1) */
 277                 case -NFS4ERR_FILE_OPEN:
 278                         if (exception->timeout > HZ) {
 279                                 /* We have retried a decent amount, time to
 280                                  * fail
 281                                  */
 282                                 ret = -EBUSY;
 283                                 break;
 284                         }
 285                 case -NFS4ERR_GRACE:
 286                 case -NFS4ERR_DELAY:
 287                 case -EKEYEXPIRED:
 288                         ret = nfs4_delay(server->client, &exception->timeout);
 289                         if (ret != 0)
 290                                 break;
 291                 case -NFS4ERR_OLD_STATEID:
 292                         exception->retry = 1;
 293         }
 294         /* We failed to handle the error */
 295         return nfs4_map_errors(ret);
 296 do_state_recovery:
 297         nfs4_schedule_state_recovery(clp);
 298         ret = nfs4_wait_clnt_recover(clp);
 299         if (ret == 0)
 300                 exception->retry = 1;
 301         return ret;
 302 }
 303
 304
 305 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 306 {
 307         spin_lock(&clp->cl_lock);
 308         if (time_before(clp->cl_last_renewal,timestamp))
 309                 clp->cl_last_renewal = timestamp;
 310         spin_unlock(&clp->cl_lock);
 311 }
 312
 313 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 314 {
 315         do_renew_lease(server->nfs_client, timestamp);
 316 }
 317
 318 #if defined(CONFIG_NFS_V4_1)
 319
 320 /*
 321  * nfs4_free_slot - free a slot and efficiently update slot table.
 322  *
 323  * freeing a slot is trivially done by clearing its respective bit
 324  * in the bitmap.
 325  * If the freed slotid equals highest_used_slotid we want to update it
 326  * so that the server would be able to size down the slot table if needed,
 327  * otherwise we know that the highest_used_slotid is still in use.
 328  * When updating highest_used_slotid there may be "holes" in the bitmap
 329  * so we need to scan down from highest_used_slotid to 0 looking for the now
 330  * highest slotid in use.
 331  * If none found, highest_used_slotid is set to -1.
 332  *
 333  * Must be called while holding tbl->slot_tbl_lock
 334  */
 335 static void
 336 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 337 {
 338         int free_slotid = free_slot - tbl->slots;
 339         int slotid = free_slotid;
 340
 341         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 342         /* clear used bit in bitmap */
 343         __clear_bit(slotid, tbl->used_slots);
 344
 345         /* update highest_used_slotid when it is freed */
 346         if (slotid == tbl->highest_used_slotid) {
 347                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 348                 if (slotid < tbl->max_slots)
 349                         tbl->highest_used_slotid = slotid;
 350                 else
 351                         tbl->highest_used_slotid = -1;
 352         }
 353         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 354                 free_slotid, tbl->highest_used_slotid);
 355 }
 356
 357 /*
 358  * Signal state manager thread if session is drained
 359  */
 360 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 361 {
 362         struct rpc_task *task;
 363
 364         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 365                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 366                 if (task)
 367                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 368                 return;
 369         }
 370
 371         if (ses->fc_slot_table.highest_used_slotid != -1)
 372                 return;
 373
 374         dprintk("%s COMPLETE: Session Drained\n", __func__);
 375         complete(&ses->complete);
 376 }
 377
 378 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 379 {
 380         struct nfs4_slot_table *tbl;
 381
 382         tbl = &res->sr_session->fc_slot_table;
 383         if (!res->sr_slot) {
 384                 /* just wake up the next guy waiting since
 385                  * we may have not consumed a slot after all */
 386                 dprintk("%s: No slot\n", __func__);
 387                 return;
 388         }
 389
 390         spin_lock(&tbl->slot_tbl_lock);
 391         nfs4_free_slot(tbl, res->sr_slot);
 392         nfs41_check_drain_session_complete(res->sr_session);
 393         spin_unlock(&tbl->slot_tbl_lock);
 394         res->sr_slot = NULL;
 395 }
 396
 397 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 398 {
 399         unsigned long timestamp;
 400         struct nfs_client *clp;
 401
 402         /*
 403          * sr_status remains 1 if an RPC level error occurred. The server
 404          * may or may not have processed the sequence operation..
 405          * Proceed as if the server received and processed the sequence
 406          * operation.
 407          */
 408         if (res->sr_status == 1)
 409                 res->sr_status = NFS_OK;
 410
 411         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 412         if (!res->sr_slot)
 413                 goto out;
 414
 415         /* Check the SEQUENCE operation status */
 416         switch (res->sr_status) {
 417         case 0:
 418                 /* Update the slot's sequence and clientid lease timer */
 419                 ++res->sr_slot->seq_nr;
 420                 timestamp = res->sr_renewal_time;
 421                 clp = res->sr_session->clp;
 422                 do_renew_lease(clp, timestamp);
 423                 /* Check sequence flags */
 424                 if (atomic_read(&clp->cl_count) > 1)
 425                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 426                 break;
 427         case -NFS4ERR_DELAY:
 428                 /* The server detected a resend of the RPC call and
 429                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 430                  * of RFC5661.
 431                  */
 432                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 433                         __func__,
 434                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 435                         res->sr_slot->seq_nr);
 436                 goto out_retry;
 437         default:
 438                 /* Just update the slot sequence no. */
 439                 ++res->sr_slot->seq_nr;
 440         }
 441 out:
 442         /* The session may be reset by one of the error handlers. */
 443         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 444         nfs41_sequence_free_slot(res);
 445         return 1;
 446 out_retry:
 447         if (!rpc_restart_call(task))
 448                 goto out;
 449         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 450         return 0;
 451 }
 452
 453 static int nfs4_sequence_done(struct rpc_task *task,
 454                                struct nfs4_sequence_res *res)
 455 {
 456         if (res->sr_session == NULL)
 457                 return 1;
 458         return nfs41_sequence_done(task, res);
 459 }
 460
 461 /*
 462  * nfs4_find_slot - efficiently look for a free slot
 463  *
 464  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 465  * If found, we mark the slot as used, update the highest_used_slotid,
 466  * and respectively set up the sequence operation args.
 467  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 468  *
 469  * Note: must be called with under the slot_tbl_lock.
 470  */
 471 static u8
 472 nfs4_find_slot(struct nfs4_slot_table *tbl)
 473 {
 474         int slotid;
 475         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 476         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 477
 478         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 479                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 480                 tbl->max_slots);
 481         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 482         if (slotid >= tbl->max_slots)
 483                 goto out;
 484         __set_bit(slotid, tbl->used_slots);
 485         if (slotid > tbl->highest_used_slotid)
 486                 tbl->highest_used_slotid = slotid;
 487         ret_id = slotid;
 488 out:
 489         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 490                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 491         return ret_id;
 492 }
 493
 494 static int nfs41_setup_sequence(struct nfs4_session *session,
 495                                 struct nfs4_sequence_args *args,
 496                                 struct nfs4_sequence_res *res,
 497                                 int cache_reply,
 498                                 struct rpc_task *task)
 499 {
 500         struct nfs4_slot *slot;
 501         struct nfs4_slot_table *tbl;
 502         u8 slotid;
 503
 504         dprintk("--> %s\n", __func__);
 505         /* slot already allocated? */
 506         if (res->sr_slot != NULL)
 507                 return 0;
 508
 509         tbl = &session->fc_slot_table;
 510
 511         spin_lock(&tbl->slot_tbl_lock);
 512         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 513             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 514                 /*
 515                  * The state manager will wait until the slot table is empty.
 516                  * Schedule the reset thread
 517                  */
 518                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 519                 spin_unlock(&tbl->slot_tbl_lock);
 520                 dprintk("%s Schedule Session Reset\n", __func__);
 521                 return -EAGAIN;
 522         }
 523
 524         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 525             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 526                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 527                 spin_unlock(&tbl->slot_tbl_lock);
 528                 dprintk("%s enforce FIFO order\n", __func__);
 529                 return -EAGAIN;
 530         }
 531
 532         slotid = nfs4_find_slot(tbl);
 533         if (slotid == NFS4_MAX_SLOT_TABLE) {
 534                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 535                 spin_unlock(&tbl->slot_tbl_lock);
 536                 dprintk("<-- %s: no free slots\n", __func__);
 537                 return -EAGAIN;
 538         }
 539         spin_unlock(&tbl->slot_tbl_lock);
 540
 541         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 542         slot = tbl->slots + slotid;
 543         args->sa_session = session;
 544         args->sa_slotid = slotid;
 545         args->sa_cache_this = cache_reply;
 546
 547         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 548
 549         res->sr_session = session;
 550         res->sr_slot = slot;
 551         res->sr_renewal_time = jiffies;
 552         res->sr_status_flags = 0;
 553         /*
 554          * sr_status is only set in decode_sequence, and so will remain
 555          * set to 1 if an rpc level failure occurs.
 556          */
 557         res->sr_status = 1;
 558         return 0;
 559 }
 560
 561 int nfs4_setup_sequence(const struct nfs_server *server,
 562                         struct nfs4_sequence_args *args,
 563                         struct nfs4_sequence_res *res,
 564                         int cache_reply,
 565                         struct rpc_task *task)
 566 {
 567         struct nfs4_session *session = nfs4_get_session(server);
 568         int ret = 0;
 569
 570         if (session == NULL) {
 571                 args->sa_session = NULL;
 572                 res->sr_session = NULL;
 573                 goto out;
 574         }
 575
 576         dprintk("--> %s clp %p session %p sr_slot %td\n",
 577                 __func__, session->clp, session, res->sr_slot ?
 578                         res->sr_slot - session->fc_slot_table.slots : -1);
 579
 580         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 581                                    task);
 582 out:
 583         dprintk("<-- %s status=%d\n", __func__, ret);
 584         return ret;
 585 }
 586
 587 struct nfs41_call_sync_data {
 588         const struct nfs_server *seq_server;
 589         struct nfs4_sequence_args *seq_args;
 590         struct nfs4_sequence_res *seq_res;
 591         int cache_reply;
 592 };
 593
 594 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 595 {
 596         struct nfs41_call_sync_data *data = calldata;
 597
 598         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 599
 600         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 601                                 data->seq_res, data->cache_reply, task))
 602                 return;
 603         rpc_call_start(task);
 604 }
 605
 606 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 607 {
 608         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 609         nfs41_call_sync_prepare(task, calldata);
 610 }
 611
 612 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 613 {
 614         struct nfs41_call_sync_data *data = calldata;
 615
 616         nfs41_sequence_done(task, data->seq_res);
 617 }
 618
 619 struct rpc_call_ops nfs41_call_sync_ops = {
 620         .rpc_call_prepare = nfs41_call_sync_prepare,
 621         .rpc_call_done = nfs41_call_sync_done,
 622 };
 623
 624 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 625         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 626         .rpc_call_done = nfs41_call_sync_done,
 627 };
 628
 629 static int nfs4_call_sync_sequence(struct nfs_server *server,
 630                                    struct rpc_message *msg,
 631                                    struct nfs4_sequence_args *args,
 632                                    struct nfs4_sequence_res *res,
 633                                    int cache_reply,
 634                                    int privileged)
 635 {
 636         int ret;
 637         struct rpc_task *task;
 638         struct nfs41_call_sync_data data = {
 639                 .seq_server = server,
 640                 .seq_args = args,
 641                 .seq_res = res,
 642                 .cache_reply = cache_reply,
 643         };
 644         struct rpc_task_setup task_setup = {
 645                 .rpc_client = server->client,
 646                 .rpc_message = msg,
 647                 .callback_ops = &nfs41_call_sync_ops,
 648                 .callback_data = &data
 649         };
 650
 651         res->sr_slot = NULL;
 652         if (privileged)
 653                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 654         task = rpc_run_task(&task_setup);
 655         if (IS_ERR(task))
 656                 ret = PTR_ERR(task);
 657         else {
 658                 ret = task->tk_status;
 659                 rpc_put_task(task);
 660         }
 661         return ret;
 662 }
 663
 664 int _nfs4_call_sync_session(struct nfs_server *server,
 665                             struct rpc_message *msg,
 666                             struct nfs4_sequence_args *args,
 667                             struct nfs4_sequence_res *res,
 668                             int cache_reply)
 669 {
 670         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 671 }
 672
 673 #else
 674 static int nfs4_sequence_done(struct rpc_task *task,
 675                                struct nfs4_sequence_res *res)
 676 {
 677         return 1;
 678 }
 679 #endif /* CONFIG_NFS_V4_1 */
 680
 681 int _nfs4_call_sync(struct nfs_server *server,
 682                     struct rpc_message *msg,
 683                     struct nfs4_sequence_args *args,
 684                     struct nfs4_sequence_res *res,
 685                     int cache_reply)
 686 {
 687         args->sa_session = res->sr_session = NULL;
 688         return rpc_call_sync(server->client, msg, 0);
 689 }
 690
 691 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 692         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 693                         &(res)->seq_res, (cache_reply))
 694
 695 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 696 {
 697         struct nfs_inode *nfsi = NFS_I(dir);
 698
 699         spin_lock(&dir->i_lock);
 700         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 701         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 702                 nfs_force_lookup_revalidate(dir);
 703         nfsi->change_attr = cinfo->after;
 704         spin_unlock(&dir->i_lock);
 705 }
 706
 707 struct nfs4_opendata {
 708         struct kref kref;
 709         struct nfs_openargs o_arg;
 710         struct nfs_openres o_res;
 711         struct nfs_open_confirmargs c_arg;
 712         struct nfs_open_confirmres c_res;
 713         struct nfs_fattr f_attr;
 714         struct nfs_fattr dir_attr;
 715         struct path path;
 716         struct dentry *dir;
 717         struct nfs4_state_owner *owner;
 718         struct nfs4_state *state;
 719         struct iattr attrs;
 720         unsigned long timestamp;
 721         unsigned int rpc_done : 1;
 722         int rpc_status;
 723         int cancelled;
 724 };
 725
 726
 727 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 728 {
 729         p->o_res.f_attr = &p->f_attr;
 730         p->o_res.dir_attr = &p->dir_attr;
 731         p->o_res.seqid = p->o_arg.seqid;
 732         p->c_res.seqid = p->c_arg.seqid;
 733         p->o_res.server = p->o_arg.server;
 734         nfs_fattr_init(&p->f_attr);
 735         nfs_fattr_init(&p->dir_attr);
 736 }
 737
 738 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 739                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 740                 const struct iattr *attrs,
 741                 gfp_t gfp_mask)
 742 {
 743         struct dentry *parent = dget_parent(path->dentry);
 744         struct inode *dir = parent->d_inode;
 745         struct nfs_server *server = NFS_SERVER(dir);
 746         struct nfs4_opendata *p;
 747
 748         p = kzalloc(sizeof(*p), gfp_mask);
 749         if (p == NULL)
 750                 goto err;
 751         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 752         if (p->o_arg.seqid == NULL)
 753                 goto err_free;
 754         path_get(path);
 755         p->path = *path;
 756         p->dir = parent;
 757         p->owner = sp;
 758         atomic_inc(&sp->so_count);
 759         p->o_arg.fh = NFS_FH(dir);
 760         p->o_arg.open_flags = flags;
 761         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 762         p->o_arg.clientid = server->nfs_client->cl_clientid;
 763         p->o_arg.id = sp->so_owner_id.id;
 764         p->o_arg.name = &p->path.dentry->d_name;
 765         p->o_arg.server = server;
 766         p->o_arg.bitmask = server->attr_bitmask;
 767         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 768         if (flags & O_CREAT) {
 769                 u32 *s;
 770
 771                 p->o_arg.u.attrs = &p->attrs;
 772                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 773                 s = (u32 *) p->o_arg.u.verifier.data;
 774                 s[0] = jiffies;
 775                 s[1] = current->pid;
 776         }
 777         p->c_arg.fh = &p->o_res.fh;
 778         p->c_arg.stateid = &p->o_res.stateid;
 779         p->c_arg.seqid = p->o_arg.seqid;
 780         nfs4_init_opendata_res(p);
 781         kref_init(&p->kref);
 782         return p;
 783 err_free:
 784         kfree(p);
 785 err:
 786         dput(parent);
 787         return NULL;
 788 }
 789
 790 static void nfs4_opendata_free(struct kref *kref)
 791 {
 792         struct nfs4_opendata *p = container_of(kref,
 793                         struct nfs4_opendata, kref);
 794
 795         nfs_free_seqid(p->o_arg.seqid);
 796         if (p->state != NULL)
 797                 nfs4_put_open_state(p->state);
 798         nfs4_put_state_owner(p->owner);
 799         dput(p->dir);
 800         path_put(&p->path);
 801         kfree(p);
 802 }
 803
 804 static void nfs4_opendata_put(struct nfs4_opendata *p)
 805 {
 806         if (p != NULL)
 807                 kref_put(&p->kref, nfs4_opendata_free);
 808 }
 809
 810 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 811 {
 812         int ret;
 813
 814         ret = rpc_wait_for_completion_task(task);
 815         return ret;
 816 }
 817
 818 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 819 {
 820         int ret = 0;
 821
 822         if (open_mode & O_EXCL)
 823                 goto out;
 824         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 825                 case FMODE_READ:
 826                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 827                                 && state->n_rdonly != 0;
 828                         break;
 829                 case FMODE_WRITE:
 830                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 831                                 && state->n_wronly != 0;
 832                         break;
 833                 case FMODE_READ|FMODE_WRITE:
 834                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 835                                 && state->n_rdwr != 0;
 836         }
 837 out:
 838         return ret;
 839 }
 840
 841 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 842 {
 843         if ((delegation->type & fmode) != fmode)
 844                 return 0;
 845         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 846                 return 0;
 847         nfs_mark_delegation_referenced(delegation);
 848         return 1;
 849 }
 850
 851 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 852 {
 853         switch (fmode) {
 854                 case FMODE_WRITE:
 855                         state->n_wronly++;
 856                         break;
 857                 case FMODE_READ:
 858                         state->n_rdonly++;
 859                         break;
 860                 case FMODE_READ|FMODE_WRITE:
 861                         state->n_rdwr++;
 862         }
 863         nfs4_state_set_mode_locked(state, state->state | fmode);
 864 }
 865
 866 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 867 {
 868         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 869                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 870         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 871         switch (fmode) {
 872                 case FMODE_READ:
 873                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 874                         break;
 875                 case FMODE_WRITE:
 876                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 877                         break;
 878                 case FMODE_READ|FMODE_WRITE:
 879                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 880         }
 881 }
 882
 883 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 884 {
 885         write_seqlock(&state->seqlock);
 886         nfs_set_open_stateid_locked(state, stateid, fmode);
 887         write_sequnlock(&state->seqlock);
 888 }
 889
 890 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 891 {
 892         /*
 893          * Protect the call to nfs4_state_set_mode_locked and
 894          * serialise the stateid update
 895          */
 896         write_seqlock(&state->seqlock);
 897         if (deleg_stateid != NULL) {
 898                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 899                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 900         }
 901         if (open_stateid != NULL)
 902                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 903         write_sequnlock(&state->seqlock);
 904         spin_lock(&state->owner->so_lock);
 905         update_open_stateflags(state, fmode);
 906         spin_unlock(&state->owner->so_lock);
 907 }
 908
 909 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 910 {
 911         struct nfs_inode *nfsi = NFS_I(state->inode);
 912         struct nfs_delegation *deleg_cur;
 913         int ret = 0;
 914
 915         fmode &= (FMODE_READ|FMODE_WRITE);
 916
 917         rcu_read_lock();
 918         deleg_cur = rcu_dereference(nfsi->delegation);
 919         if (deleg_cur == NULL)
 920                 goto no_delegation;
 921
 922         spin_lock(&deleg_cur->lock);
 923         if (nfsi->delegation != deleg_cur ||
 924             (deleg_cur->type & fmode) != fmode)
 925                 goto no_delegation_unlock;
 926
 927         if (delegation == NULL)
 928                 delegation = &deleg_cur->stateid;
 929         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 930                 goto no_delegation_unlock;
 931
 932         nfs_mark_delegation_referenced(deleg_cur);
 933         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 934         ret = 1;
 935 no_delegation_unlock:
 936         spin_unlock(&deleg_cur->lock);
 937 no_delegation:
 938         rcu_read_unlock();
 939
 940         if (!ret && open_stateid != NULL) {
 941                 __update_open_stateid(state, open_stateid, NULL, fmode);
 942                 ret = 1;
 943         }
 944
 945         return ret;
 946 }
 947
 948
 949 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 950 {
 951         struct nfs_delegation *delegation;
 952
 953         rcu_read_lock();
 954         delegation = rcu_dereference(NFS_I(inode)->delegation);
 955         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 956                 rcu_read_unlock();
 957                 return;
 958         }
 959         rcu_read_unlock();
 960         nfs_inode_return_delegation(inode);
 961 }
 962
 963 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 964 {
 965         struct nfs4_state *state = opendata->state;
 966         struct nfs_inode *nfsi = NFS_I(state->inode);
 967         struct nfs_delegation *delegation;
 968         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 969         fmode_t fmode = opendata->o_arg.fmode;
 970         nfs4_stateid stateid;
 971         int ret = -EAGAIN;
 972
 973         for (;;) {
 974                 if (can_open_cached(state, fmode, open_mode)) {
 975                         spin_lock(&state->owner->so_lock);
 976                         if (can_open_cached(state, fmode, open_mode)) {
 977                                 update_open_stateflags(state, fmode);
 978                                 spin_unlock(&state->owner->so_lock);
 979                                 goto out_return_state;
 980                         }
 981                         spin_unlock(&state->owner->so_lock);
 982                 }
 983                 rcu_read_lock();
 984                 delegation = rcu_dereference(nfsi->delegation);
 985                 if (delegation == NULL ||
 986                     !can_open_delegated(delegation, fmode)) {
 987                         rcu_read_unlock();
 988                         break;
 989                 }
 990                 /* Save the delegation */
 991                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 992                 rcu_read_unlock();
 993                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 994                 if (ret != 0)
 995                         goto out;
 996                 ret = -EAGAIN;
 997
 998                 /* Try to update the stateid using the delegation */
 999                 if (update_open_stateid(state, NULL, &stateid, fmode))
1000                         goto out_return_state;
1001         }
1002 out:
1003         return ERR_PTR(ret);
1004 out_return_state:
1005         atomic_inc(&state->count);
1006         return state;
1007 }
1008
1009 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1010 {
1011         struct inode *inode;
1012         struct nfs4_state *state = NULL;
1013         struct nfs_delegation *delegation;
1014         int ret;
1015
1016         if (!data->rpc_done) {
1017                 state = nfs4_try_open_cached(data);
1018                 goto out;
1019         }
1020
1021         ret = -EAGAIN;
1022         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1023                 goto err;
1024         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1025         ret = PTR_ERR(inode);
1026         if (IS_ERR(inode))
1027                 goto err;
1028         ret = -ENOMEM;
1029         state = nfs4_get_open_state(inode, data->owner);
1030         if (state == NULL)
1031                 goto err_put_inode;
1032         if (data->o_res.delegation_type != 0) {
1033                 int delegation_flags = 0;
1034
1035                 rcu_read_lock();
1036                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1037                 if (delegation)
1038                         delegation_flags = delegation->flags;
1039                 rcu_read_unlock();
1040                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1041                         nfs_inode_set_delegation(state->inode,
1042                                         data->owner->so_cred,
1043                                         &data->o_res);
1044                 else
1045                         nfs_inode_reclaim_delegation(state->inode,
1046                                         data->owner->so_cred,
1047                                         &data->o_res);
1048         }
1049
1050         update_open_stateid(state, &data->o_res.stateid, NULL,
1051                         data->o_arg.fmode);
1052         iput(inode);
1053 out:
1054         return state;
1055 err_put_inode:
1056         iput(inode);
1057 err:
1058         return ERR_PTR(ret);
1059 }
1060
1061 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1062 {
1063         struct nfs_inode *nfsi = NFS_I(state->inode);
1064         struct nfs_open_context *ctx;
1065
1066         spin_lock(&state->inode->i_lock);
1067         list_for_each_entry(ctx, &nfsi->open_files, list) {
1068                 if (ctx->state != state)
1069                         continue;
1070                 get_nfs_open_context(ctx);
1071                 spin_unlock(&state->inode->i_lock);
1072                 return ctx;
1073         }
1074         spin_unlock(&state->inode->i_lock);
1075         return ERR_PTR(-ENOENT);
1076 }
1077
1078 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1079 {
1080         struct nfs4_opendata *opendata;
1081
1082         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1083         if (opendata == NULL)
1084                 return ERR_PTR(-ENOMEM);
1085         opendata->state = state;
1086         atomic_inc(&state->count);
1087         return opendata;
1088 }
1089
1090 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1091 {
1092         struct nfs4_state *newstate;
1093         int ret;
1094
1095         opendata->o_arg.open_flags = 0;
1096         opendata->o_arg.fmode = fmode;
1097         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1098         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1099         nfs4_init_opendata_res(opendata);
1100         ret = _nfs4_recover_proc_open(opendata);
1101         if (ret != 0)
1102                 return ret;
1103         newstate = nfs4_opendata_to_nfs4_state(opendata);
1104         if (IS_ERR(newstate))
1105                 return PTR_ERR(newstate);
1106         nfs4_close_state(&opendata->path, newstate, fmode);
1107         *res = newstate;
1108         return 0;
1109 }
1110
1111 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1112 {
1113         struct nfs4_state *newstate;
1114         int ret;
1115
1116         /* memory barrier prior to reading state->n_* */
1117         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1118         smp_rmb();
1119         if (state->n_rdwr != 0) {
1120                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1121                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1122                 if (ret != 0)
1123                         return ret;
1124                 if (newstate != state)
1125                         return -ESTALE;
1126         }
1127         if (state->n_wronly != 0) {
1128                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1129                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1130                 if (ret != 0)
1131                         return ret;
1132                 if (newstate != state)
1133                         return -ESTALE;
1134         }
1135         if (state->n_rdonly != 0) {
1136                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1137                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1138                 if (ret != 0)
1139                         return ret;
1140                 if (newstate != state)
1141                         return -ESTALE;
1142         }
1143         /*
1144          * We may have performed cached opens for all three recoveries.
1145          * Check if we need to update the current stateid.
1146          */
1147         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1148             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1149                 write_seqlock(&state->seqlock);
1150                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1151                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1152                 write_sequnlock(&state->seqlock);
1153         }
1154         return 0;
1155 }
1156
1157 /*
1158  * OPEN_RECLAIM:
1159  *      reclaim state on the server after a reboot.
1160  */
1161 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1162 {
1163         struct nfs_delegation *delegation;
1164         struct nfs4_opendata *opendata;
1165         fmode_t delegation_type = 0;
1166         int status;
1167
1168         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1169         if (IS_ERR(opendata))
1170                 return PTR_ERR(opendata);
1171         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1172         opendata->o_arg.fh = NFS_FH(state->inode);
1173         rcu_read_lock();
1174         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1175         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1176                 delegation_type = delegation->type;
1177         rcu_read_unlock();
1178         opendata->o_arg.u.delegation_type = delegation_type;
1179         status = nfs4_open_recover(opendata, state);
1180         nfs4_opendata_put(opendata);
1181         return status;
1182 }
1183
1184 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1185 {
1186         struct nfs_server *server = NFS_SERVER(state->inode);
1187         struct nfs4_exception exception = { };
1188         int err;
1189         do {
1190                 err = _nfs4_do_open_reclaim(ctx, state);
1191                 if (err != -NFS4ERR_DELAY)
1192                         break;
1193                 nfs4_handle_exception(server, err, &exception);
1194         } while (exception.retry);
1195         return err;
1196 }
1197
1198 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1199 {
1200         struct nfs_open_context *ctx;
1201         int ret;
1202
1203         ctx = nfs4_state_find_open_context(state);
1204         if (IS_ERR(ctx))
1205                 return PTR_ERR(ctx);
1206         ret = nfs4_do_open_reclaim(ctx, state);
1207         put_nfs_open_context(ctx);
1208         return ret;
1209 }
1210
1211 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1212 {
1213         struct nfs4_opendata *opendata;
1214         int ret;
1215
1216         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1217         if (IS_ERR(opendata))
1218                 return PTR_ERR(opendata);
1219         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1220         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1221                         sizeof(opendata->o_arg.u.delegation.data));
1222         ret = nfs4_open_recover(opendata, state);
1223         nfs4_opendata_put(opendata);
1224         return ret;
1225 }
1226
1227 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1228 {
1229         struct nfs4_exception exception = { };
1230         struct nfs_server *server = NFS_SERVER(state->inode);
1231         int err;
1232         do {
1233                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1234                 switch (err) {
1235                         case 0:
1236                         case -ENOENT:
1237                         case -ESTALE:
1238                                 goto out;
1239                         case -NFS4ERR_BADSESSION:
1240                         case -NFS4ERR_BADSLOT:
1241                         case -NFS4ERR_BAD_HIGH_SLOT:
1242                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1243                         case -NFS4ERR_DEADSESSION:
1244                                 nfs4_schedule_state_recovery(
1245                                         server->nfs_client);
1246                                 goto out;
1247                         case -NFS4ERR_STALE_CLIENTID:
1248                         case -NFS4ERR_STALE_STATEID:
1249                         case -NFS4ERR_EXPIRED:
1250                                 /* Don't recall a delegation if it was lost */
1251                                 nfs4_schedule_state_recovery(server->nfs_client);
1252                                 goto out;
1253                         case -ERESTARTSYS:
1254                                 /*
1255                                  * The show must go on: exit, but mark the
1256                                  * stateid as needing recovery.
1257                                  */
1258                         case -NFS4ERR_ADMIN_REVOKED:
1259                         case -NFS4ERR_BAD_STATEID:
1260                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1261                         case -EKEYEXPIRED:
1262                                 /*
1263                                  * User RPCSEC_GSS context has expired.
1264                                  * We cannot recover this stateid now, so
1265                                  * skip it and allow recovery thread to
1266                                  * proceed.
1267                                  */
1268                         case -ENOMEM:
1269                                 err = 0;
1270                                 goto out;
1271                 }
1272                 err = nfs4_handle_exception(server, err, &exception);
1273         } while (exception.retry);
1274 out:
1275         return err;
1276 }
1277
1278 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1279 {
1280         struct nfs4_opendata *data = calldata;
1281
1282         data->rpc_status = task->tk_status;
1283         if (data->rpc_status == 0) {
1284                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1285                                 sizeof(data->o_res.stateid.data));
1286                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1287                 renew_lease(data->o_res.server, data->timestamp);
1288                 data->rpc_done = 1;
1289         }
1290 }
1291
1292 static void nfs4_open_confirm_release(void *calldata)
1293 {
1294         struct nfs4_opendata *data = calldata;
1295         struct nfs4_state *state = NULL;
1296
1297         /* If this request hasn't been cancelled, do nothing */
1298         if (data->cancelled == 0)
1299                 goto out_free;
1300         /* In case of error, no cleanup! */
1301         if (!data->rpc_done)
1302                 goto out_free;
1303         state = nfs4_opendata_to_nfs4_state(data);
1304         if (!IS_ERR(state))
1305                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1306 out_free:
1307         nfs4_opendata_put(data);
1308 }
1309
1310 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1311         .rpc_call_done = nfs4_open_confirm_done,
1312         .rpc_release = nfs4_open_confirm_release,
1313 };
1314
1315 /*
1316  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1317  */
1318 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1319 {
1320         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1321         struct rpc_task *task;
1322         struct  rpc_message msg = {
1323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1324                 .rpc_argp = &data->c_arg,
1325                 .rpc_resp = &data->c_res,
1326                 .rpc_cred = data->owner->so_cred,
1327         };
1328         struct rpc_task_setup task_setup_data = {
1329                 .rpc_client = server->client,
1330                 .rpc_message = &msg,
1331                 .callback_ops = &nfs4_open_confirm_ops,
1332                 .callback_data = data,
1333                 .workqueue = nfsiod_workqueue,
1334                 .flags = RPC_TASK_ASYNC,
1335         };
1336         int status;
1337
1338         kref_get(&data->kref);
1339         data->rpc_done = 0;
1340         data->rpc_status = 0;
1341         data->timestamp = jiffies;
1342         task = rpc_run_task(&task_setup_data);
1343         if (IS_ERR(task))
1344                 return PTR_ERR(task);
1345         status = nfs4_wait_for_completion_rpc_task(task);
1346         if (status != 0) {
1347                 data->cancelled = 1;
1348                 smp_wmb();
1349         } else
1350                 status = data->rpc_status;
1351         rpc_put_task(task);
1352         return status;
1353 }
1354
1355 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1356 {
1357         struct nfs4_opendata *data = calldata;
1358         struct nfs4_state_owner *sp = data->owner;
1359
1360         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1361                 return;
1362         /*
1363          * Check if we still need to send an OPEN call, or if we can use
1364          * a delegation instead.
1365          */
1366         if (data->state != NULL) {
1367                 struct nfs_delegation *delegation;
1368
1369                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1370                         goto out_no_action;
1371                 rcu_read_lock();
1372                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1373                 if (delegation != NULL &&
1374                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1375                         rcu_read_unlock();
1376                         goto out_no_action;
1377                 }
1378                 rcu_read_unlock();
1379         }
1380         /* Update sequence id. */
1381         data->o_arg.id = sp->so_owner_id.id;
1382         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1383         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1384                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1385                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1386         }
1387         data->timestamp = jiffies;
1388         if (nfs4_setup_sequence(data->o_arg.server,
1389                                 &data->o_arg.seq_args,
1390                                 &data->o_res.seq_res, 1, task))
1391                 return;
1392         rpc_call_start(task);
1393         return;
1394 out_no_action:
1395         task->tk_action = NULL;
1396
1397 }
1398
1399 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1400 {
1401         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1402         nfs4_open_prepare(task, calldata);
1403 }
1404
1405 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1406 {
1407         struct nfs4_opendata *data = calldata;
1408
1409         data->rpc_status = task->tk_status;
1410
1411         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1412                 return;
1413
1414         if (task->tk_status == 0) {
1415                 switch (data->o_res.f_attr->mode & S_IFMT) {
1416                         case S_IFREG:
1417                                 break;
1418                         case S_IFLNK:
1419                                 data->rpc_status = -ELOOP;
1420                                 break;
1421                         case S_IFDIR:
1422                                 data->rpc_status = -EISDIR;
1423                                 break;
1424                         default:
1425                                 data->rpc_status = -ENOTDIR;
1426                 }
1427                 renew_lease(data->o_res.server, data->timestamp);
1428                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1429                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1430         }
1431         data->rpc_done = 1;
1432 }
1433
1434 static void nfs4_open_release(void *calldata)
1435 {
1436         struct nfs4_opendata *data = calldata;
1437         struct nfs4_state *state = NULL;
1438
1439         /* If this request hasn't been cancelled, do nothing */
1440         if (data->cancelled == 0)
1441                 goto out_free;
1442         /* In case of error, no cleanup! */
1443         if (data->rpc_status != 0 || !data->rpc_done)
1444                 goto out_free;
1445         /* In case we need an open_confirm, no cleanup! */
1446         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1447                 goto out_free;
1448         state = nfs4_opendata_to_nfs4_state(data);
1449         if (!IS_ERR(state))
1450                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1451 out_free:
1452         nfs4_opendata_put(data);
1453 }
1454
1455 static const struct rpc_call_ops nfs4_open_ops = {
1456         .rpc_call_prepare = nfs4_open_prepare,
1457         .rpc_call_done = nfs4_open_done,
1458         .rpc_release = nfs4_open_release,
1459 };
1460
1461 static const struct rpc_call_ops nfs4_recover_open_ops = {
1462         .rpc_call_prepare = nfs4_recover_open_prepare,
1463         .rpc_call_done = nfs4_open_done,
1464         .rpc_release = nfs4_open_release,
1465 };
1466
1467 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1468 {
1469         struct inode *dir = data->dir->d_inode;
1470         struct nfs_server *server = NFS_SERVER(dir);
1471         struct nfs_openargs *o_arg = &data->o_arg;
1472         struct nfs_openres *o_res = &data->o_res;
1473         struct rpc_task *task;
1474         struct rpc_message msg = {
1475                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1476                 .rpc_argp = o_arg,
1477                 .rpc_resp = o_res,
1478                 .rpc_cred = data->owner->so_cred,
1479         };
1480         struct rpc_task_setup task_setup_data = {
1481                 .rpc_client = server->client,
1482                 .rpc_message = &msg,
1483                 .callback_ops = &nfs4_open_ops,
1484                 .callback_data = data,
1485                 .workqueue = nfsiod_workqueue,
1486                 .flags = RPC_TASK_ASYNC,
1487         };
1488         int status;
1489
1490         kref_get(&data->kref);
1491         data->rpc_done = 0;
1492         data->rpc_status = 0;
1493         data->cancelled = 0;
1494         if (isrecover)
1495                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1496         task = rpc_run_task(&task_setup_data);
1497         if (IS_ERR(task))
1498                 return PTR_ERR(task);
1499         status = nfs4_wait_for_completion_rpc_task(task);
1500         if (status != 0) {
1501                 data->cancelled = 1;
1502                 smp_wmb();
1503         } else
1504                 status = data->rpc_status;
1505         rpc_put_task(task);
1506
1507         return status;
1508 }
1509
1510 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1511 {
1512         struct inode *dir = data->dir->d_inode;
1513         struct nfs_openres *o_res = &data->o_res;
1514         int status;
1515
1516         status = nfs4_run_open_task(data, 1);
1517         if (status != 0 || !data->rpc_done)
1518                 return status;
1519
1520         nfs_refresh_inode(dir, o_res->dir_attr);
1521
1522         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1523                 status = _nfs4_proc_open_confirm(data);
1524                 if (status != 0)
1525                         return status;
1526         }
1527
1528         return status;
1529 }
1530
1531 /*
1532  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1533  */
1534 static int _nfs4_proc_open(struct nfs4_opendata *data)
1535 {
1536         struct inode *dir = data->dir->d_inode;
1537         struct nfs_server *server = NFS_SERVER(dir);
1538         struct nfs_openargs *o_arg = &data->o_arg;
1539         struct nfs_openres *o_res = &data->o_res;
1540         int status;
1541
1542         status = nfs4_run_open_task(data, 0);
1543         if (status != 0 || !data->rpc_done)
1544                 return status;
1545
1546         if (o_arg->open_flags & O_CREAT) {
1547                 update_changeattr(dir, &o_res->cinfo);
1548                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1549         } else
1550                 nfs_refresh_inode(dir, o_res->dir_attr);
1551         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1552                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1553         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1554                 status = _nfs4_proc_open_confirm(data);
1555                 if (status != 0)
1556                         return status;
1557         }
1558         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1559                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1560         return 0;
1561 }
1562
1563 static int nfs4_recover_expired_lease(struct nfs_server *server)
1564 {
1565         struct nfs_client *clp = server->nfs_client;
1566         unsigned int loop;
1567         int ret;
1568
1569         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1570                 ret = nfs4_wait_clnt_recover(clp);
1571                 if (ret != 0)
1572                         break;
1573                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1574                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1575                         break;
1576                 nfs4_schedule_state_recovery(clp);
1577                 ret = -EIO;
1578         }
1579         return ret;
1580 }
1581
1582 /*
1583  * OPEN_EXPIRED:
1584  *      reclaim state on the server after a network partition.
1585  *      Assumes caller holds the appropriate lock
1586  */
1587 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1588 {
1589         struct nfs4_opendata *opendata;
1590         int ret;
1591
1592         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1593         if (IS_ERR(opendata))
1594                 return PTR_ERR(opendata);
1595         ret = nfs4_open_recover(opendata, state);
1596         if (ret == -ESTALE)
1597                 d_drop(ctx->path.dentry);
1598         nfs4_opendata_put(opendata);
1599         return ret;
1600 }
1601
1602 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1603 {
1604         struct nfs_server *server = NFS_SERVER(state->inode);
1605         struct nfs4_exception exception = { };
1606         int err;
1607
1608         do {
1609                 err = _nfs4_open_expired(ctx, state);
1610                 switch (err) {
1611                 default:
1612                         goto out;
1613                 case -NFS4ERR_GRACE:
1614                 case -NFS4ERR_DELAY:
1615                         nfs4_handle_exception(server, err, &exception);
1616                         err = 0;
1617                 }
1618         } while (exception.retry);
1619 out:
1620         return err;
1621 }
1622
1623 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1624 {
1625         struct nfs_open_context *ctx;
1626         int ret;
1627
1628         ctx = nfs4_state_find_open_context(state);
1629         if (IS_ERR(ctx))
1630                 return PTR_ERR(ctx);
1631         ret = nfs4_do_open_expired(ctx, state);
1632         put_nfs_open_context(ctx);
1633         return ret;
1634 }
1635
1636 /*
1637  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1638  * fields corresponding to attributes that were used to store the verifier.
1639  * Make sure we clobber those fields in the later setattr call
1640  */
1641 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1642 {
1643         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1644             !(sattr->ia_valid & ATTR_ATIME_SET))
1645                 sattr->ia_valid |= ATTR_ATIME;
1646
1647         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1648             !(sattr->ia_valid & ATTR_MTIME_SET))
1649                 sattr->ia_valid |= ATTR_MTIME;
1650 }
1651
1652 /*
1653  * Returns a referenced nfs4_state
1654  */
1655 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)
1656 {
1657         struct nfs4_state_owner  *sp;
1658         struct nfs4_state     *state = NULL;
1659         struct nfs_server       *server = NFS_SERVER(dir);
1660         struct nfs4_opendata *opendata;
1661         int status;
1662
1663         /* Protect against reboot recovery conflicts */
1664         status = -ENOMEM;
1665         if (!(sp = nfs4_get_state_owner(server, cred))) {
1666                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1667                 goto out_err;
1668         }
1669         status = nfs4_recover_expired_lease(server);
1670         if (status != 0)
1671                 goto err_put_state_owner;
1672         if (path->dentry->d_inode != NULL)
1673                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1674         status = -ENOMEM;
1675         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1676         if (opendata == NULL)
1677                 goto err_put_state_owner;
1678
1679         if (path->dentry->d_inode != NULL)
1680                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1681
1682         status = _nfs4_proc_open(opendata);
1683         if (status != 0)
1684                 goto err_opendata_put;
1685
1686         state = nfs4_opendata_to_nfs4_state(opendata);
1687         status = PTR_ERR(state);
1688         if (IS_ERR(state))
1689                 goto err_opendata_put;
1690         if (server->caps & NFS_CAP_POSIX_LOCK)
1691                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1692
1693         if (opendata->o_arg.open_flags & O_EXCL) {
1694                 nfs4_exclusive_attrset(opendata, sattr);
1695
1696                 nfs_fattr_init(opendata->o_res.f_attr);
1697                 status = nfs4_do_setattr(state->inode, cred,
1698                                 opendata->o_res.f_attr, sattr,
1699                                 state);
1700                 if (status == 0)
1701                         nfs_setattr_update_inode(state->inode, sattr);
1702                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1703         }
1704         nfs4_opendata_put(opendata);
1705         nfs4_put_state_owner(sp);
1706         *res = state;
1707         return 0;
1708 err_opendata_put:
1709         nfs4_opendata_put(opendata);
1710 err_put_state_owner:
1711         nfs4_put_state_owner(sp);
1712 out_err:
1713         *res = NULL;
1714         return status;
1715 }
1716
1717
1718 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)
1719 {
1720         struct nfs4_exception exception = { };
1721         struct nfs4_state *res;
1722         int status;
1723
1724         do {
1725                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1726                 if (status == 0)
1727                         break;
1728                 /* NOTE: BAD_SEQID means the server and client disagree about the
1729                  * book-keeping w.r.t. state-changing operations
1730                  * (OPEN/CLOSE/LOCK/LOCKU...)
1731                  * It is actually a sign of a bug on the client or on the server.
1732                  *
1733                  * If we receive a BAD_SEQID error in the particular case of
1734                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1735                  * have unhashed the old state_owner for us, and that we can
1736                  * therefore safely retry using a new one. We should still warn
1737                  * the user though...
1738                  */
1739                 if (status == -NFS4ERR_BAD_SEQID) {
1740                         printk(KERN_WARNING "NFS: v4 server %s "
1741                                         " returned a bad sequence-id error!\n",
1742                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1743                         exception.retry = 1;
1744                         continue;
1745                 }
1746                 /*
1747                  * BAD_STATEID on OPEN means that the server cancelled our
1748                  * state before it received the OPEN_CONFIRM.
1749                  * Recover by retrying the request as per the discussion
1750                  * on Page 181 of RFC3530.
1751                  */
1752                 if (status == -NFS4ERR_BAD_STATEID) {
1753                         exception.retry = 1;
1754                         continue;
1755                 }
1756                 if (status == -EAGAIN) {
1757                         /* We must have found a delegation */
1758                         exception.retry = 1;
1759                         continue;
1760                 }
1761                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1762                                         status, &exception));
1763         } while (exception.retry);
1764         return res;
1765 }
1766
1767 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1768                             struct nfs_fattr *fattr, struct iattr *sattr,
1769                             struct nfs4_state *state)
1770 {
1771         struct nfs_server *server = NFS_SERVER(inode);
1772         struct nfs_setattrargs  arg = {
1773                 .fh             = NFS_FH(inode),
1774                 .iap            = sattr,
1775                 .server         = server,
1776                 .bitmask = server->attr_bitmask,
1777         };
1778         struct nfs_setattrres  res = {
1779                 .fattr          = fattr,
1780                 .server         = server,
1781         };
1782         struct rpc_message msg = {
1783                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1784                 .rpc_argp       = &arg,
1785                 .rpc_resp       = &res,
1786                 .rpc_cred       = cred,
1787         };
1788         unsigned long timestamp = jiffies;
1789         int status;
1790
1791         nfs_fattr_init(fattr);
1792
1793         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1794                 /* Use that stateid */
1795         } else if (state != NULL) {
1796                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1797         } else
1798                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1799
1800         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1801         if (status == 0 && state != NULL)
1802                 renew_lease(server, timestamp);
1803         return status;
1804 }
1805
1806 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1807                            struct nfs_fattr *fattr, struct iattr *sattr,
1808                            struct nfs4_state *state)
1809 {
1810         struct nfs_server *server = NFS_SERVER(inode);
1811         struct nfs4_exception exception = { };
1812         int err;
1813         do {
1814                 err = nfs4_handle_exception(server,
1815                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1816                                 &exception);
1817         } while (exception.retry);
1818         return err;
1819 }
1820
1821 struct nfs4_closedata {
1822         struct path path;
1823         struct inode *inode;
1824         struct nfs4_state *state;
1825         struct nfs_closeargs arg;
1826         struct nfs_closeres res;
1827         struct nfs_fattr fattr;
1828         unsigned long timestamp;
1829 };
1830
1831 static void nfs4_free_closedata(void *data)
1832 {
1833         struct nfs4_closedata *calldata = data;
1834         struct nfs4_state_owner *sp = calldata->state->owner;
1835
1836         nfs4_put_open_state(calldata->state);
1837         nfs_free_seqid(calldata->arg.seqid);
1838         nfs4_put_state_owner(sp);
1839         path_put(&calldata->path);
1840         kfree(calldata);
1841 }
1842
1843 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1844                 fmode_t fmode)
1845 {
1846         spin_lock(&state->owner->so_lock);
1847         if (!(fmode & FMODE_READ))
1848                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1849         if (!(fmode & FMODE_WRITE))
1850                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1851         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1852         spin_unlock(&state->owner->so_lock);
1853 }
1854
1855 static void nfs4_close_done(struct rpc_task *task, void *data)
1856 {
1857         struct nfs4_closedata *calldata = data;
1858         struct nfs4_state *state = calldata->state;
1859         struct nfs_server *server = NFS_SERVER(calldata->inode);
1860
1861         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1862                 return;
1863         /* hmm. we are done with the inode, and in the process of freeing
1864          * the state_owner. we keep this around to process errors
1865          */
1866         switch (task->tk_status) {
1867                 case 0:
1868                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1869                         renew_lease(server, calldata->timestamp);
1870                         nfs4_close_clear_stateid_flags(state,
1871                                         calldata->arg.fmode);
1872                         break;
1873                 case -NFS4ERR_STALE_STATEID:
1874                 case -NFS4ERR_OLD_STATEID:
1875                 case -NFS4ERR_BAD_STATEID:
1876                 case -NFS4ERR_EXPIRED:
1877                         if (calldata->arg.fmode == 0)
1878                                 break;
1879                 default:
1880                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1881                                 rpc_restart_call_prepare(task);
1882         }
1883         nfs_release_seqid(calldata->arg.seqid);
1884         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1885 }
1886
1887 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1888 {
1889         struct nfs4_closedata *calldata = data;
1890         struct nfs4_state *state = calldata->state;
1891         int call_close = 0;
1892
1893         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1894                 return;
1895
1896         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1897         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1898         spin_lock(&state->owner->so_lock);
1899         /* Calculate the change in open mode */
1900         if (state->n_rdwr == 0) {
1901                 if (state->n_rdonly == 0) {
1902                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1903                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1904                         calldata->arg.fmode &= ~FMODE_READ;
1905                 }
1906                 if (state->n_wronly == 0) {
1907                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1908                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1909                         calldata->arg.fmode &= ~FMODE_WRITE;
1910                 }
1911         }
1912         spin_unlock(&state->owner->so_lock);
1913
1914         if (!call_close) {
1915                 /* Note: exit _without_ calling nfs4_close_done */
1916                 task->tk_action = NULL;
1917                 return;
1918         }
1919
1920         if (calldata->arg.fmode == 0)
1921                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1922
1923         nfs_fattr_init(calldata->res.fattr);
1924         calldata->timestamp = jiffies;
1925         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1926                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1927                                 1, task))
1928                 return;
1929         rpc_call_start(task);
1930 }
1931
1932 static const struct rpc_call_ops nfs4_close_ops = {
1933         .rpc_call_prepare = nfs4_close_prepare,
1934         .rpc_call_done = nfs4_close_done,
1935         .rpc_release = nfs4_free_closedata,
1936 };
1937
1938 /*
1939  * It is possible for data to be read/written from a mem-mapped file
1940  * after the sys_close call (which hits the vfs layer as a flush).
1941  * This means that we can't safely call nfsv4 close on a file until
1942  * the inode is cleared. This in turn means that we are not good
1943  * NFSv4 citizens - we do not indicate to the server to update the file's
1944  * share state even when we are done with one of the three share
1945  * stateid's in the inode.
1946  *
1947  * NOTE: Caller must be holding the sp->so_owner semaphore!
1948  */
1949 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1950 {
1951         struct nfs_server *server = NFS_SERVER(state->inode);
1952         struct nfs4_closedata *calldata;
1953         struct nfs4_state_owner *sp = state->owner;
1954         struct rpc_task *task;
1955         struct rpc_message msg = {
1956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1957                 .rpc_cred = state->owner->so_cred,
1958         };
1959         struct rpc_task_setup task_setup_data = {
1960                 .rpc_client = server->client,
1961                 .rpc_message = &msg,
1962                 .callback_ops = &nfs4_close_ops,
1963                 .workqueue = nfsiod_workqueue,
1964                 .flags = RPC_TASK_ASYNC,
1965         };
1966         int status = -ENOMEM;
1967
1968         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1969         if (calldata == NULL)
1970                 goto out;
1971         calldata->inode = state->inode;
1972         calldata->state = state;
1973         calldata->arg.fh = NFS_FH(state->inode);
1974         calldata->arg.stateid = &state->open_stateid;
1975         /* Serialization for the sequence id */
1976         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1977         if (calldata->arg.seqid == NULL)
1978                 goto out_free_calldata;
1979         calldata->arg.fmode = 0;
1980         calldata->arg.bitmask = server->cache_consistency_bitmask;
1981         calldata->res.fattr = &calldata->fattr;
1982         calldata->res.seqid = calldata->arg.seqid;
1983         calldata->res.server = server;
1984         path_get(path);
1985         calldata->path = *path;
1986
1987         msg.rpc_argp = &calldata->arg;
1988         msg.rpc_resp = &calldata->res;
1989         task_setup_data.callback_data = calldata;
1990         task = rpc_run_task(&task_setup_data);
1991         if (IS_ERR(task))
1992                 return PTR_ERR(task);
1993         status = 0;
1994         if (wait)
1995                 status = rpc_wait_for_completion_task(task);
1996         rpc_put_task(task);
1997         return status;
1998 out_free_calldata:
1999         kfree(calldata);
2000 out:
2001         nfs4_put_open_state(state);
2002         nfs4_put_state_owner(sp);
2003         return status;
2004 }
2005
2006 static struct inode *
2007 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2008 {
2009         struct nfs4_state *state;
2010
2011         /* Protect against concurrent sillydeletes */
2012         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2013         if (IS_ERR(state))
2014                 return ERR_CAST(state);
2015         ctx->state = state;
2016         return igrab(state->inode);
2017 }
2018
2019 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2020 {
2021         if (ctx->state == NULL)
2022                 return;
2023         if (is_sync)
2024                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2025         else
2026                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2027 }
2028
2029 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2030 {
2031         struct nfs4_server_caps_arg args = {
2032                 .fhandle = fhandle,
2033         };
2034         struct nfs4_server_caps_res res = {};
2035         struct rpc_message msg = {
2036                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2037                 .rpc_argp = &args,
2038                 .rpc_resp = &res,
2039         };
2040         int status;
2041
2042         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2043         if (status == 0) {
2044                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2045                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2046                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2047                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2048                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2049                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2050                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2051                         server->caps |= NFS_CAP_ACLS;
2052                 if (res.has_links != 0)
2053                         server->caps |= NFS_CAP_HARDLINKS;
2054                 if (res.has_symlinks != 0)
2055                         server->caps |= NFS_CAP_SYMLINKS;
2056                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2057                         server->caps |= NFS_CAP_FILEID;
2058                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2059                         server->caps |= NFS_CAP_MODE;
2060                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2061                         server->caps |= NFS_CAP_NLINK;
2062                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2063                         server->caps |= NFS_CAP_OWNER;
2064                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2065                         server->caps |= NFS_CAP_OWNER_GROUP;
2066                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2067                         server->caps |= NFS_CAP_ATIME;
2068                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2069                         server->caps |= NFS_CAP_CTIME;
2070                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2071                         server->caps |= NFS_CAP_MTIME;
2072
2073                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2074                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2075                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2076                 server->acl_bitmask = res.acl_bitmask;
2077         }
2078
2079         return status;
2080 }
2081
2082 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2083 {
2084         struct nfs4_exception exception = { };
2085         int err;
2086         do {
2087                 err = nfs4_handle_exception(server,
2088                                 _nfs4_server_capabilities(server, fhandle),
2089                                 &exception);
2090         } while (exception.retry);
2091         return err;
2092 }
2093
2094 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2095                 struct nfs_fsinfo *info)
2096 {
2097         struct nfs4_lookup_root_arg args = {
2098                 .bitmask = nfs4_fattr_bitmap,
2099         };
2100         struct nfs4_lookup_res res = {
2101                 .server = server,
2102                 .fattr = info->fattr,
2103                 .fh = fhandle,
2104         };
2105         struct rpc_message msg = {
2106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2107                 .rpc_argp = &args,
2108                 .rpc_resp = &res,
2109         };
2110
2111         nfs_fattr_init(info->fattr);
2112         return nfs4_call_sync(server, &msg, &args, &res, 0);
2113 }
2114
2115 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2116                 struct nfs_fsinfo *info)
2117 {
2118         struct nfs4_exception exception = { };
2119         int err;
2120         do {
2121                 err = nfs4_handle_exception(server,
2122                                 _nfs4_lookup_root(server, fhandle, info),
2123                                 &exception);
2124         } while (exception.retry);
2125         return err;
2126 }
2127
2128 /*
2129  * get the file handle for the "/" directory on the server
2130  */
2131 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2132                               struct nfs_fsinfo *info)
2133 {
2134         int status;
2135
2136         status = nfs4_lookup_root(server, fhandle, info);
2137         if (status == 0)
2138                 status = nfs4_server_capabilities(server, fhandle);
2139         if (status == 0)
2140                 status = nfs4_do_fsinfo(server, fhandle, info);
2141         return nfs4_map_errors(status);
2142 }
2143
2144 /*
2145  * Get locations and (maybe) other attributes of a referral.
2146  * Note that we'll actually follow the referral later when
2147  * we detect fsid mismatch in inode revalidation
2148  */
2149 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2150 {
2151         int status = -ENOMEM;
2152         struct page *page = NULL;
2153         struct nfs4_fs_locations *locations = NULL;
2154
2155         page = alloc_page(GFP_KERNEL);
2156         if (page == NULL)
2157                 goto out;
2158         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2159         if (locations == NULL)
2160                 goto out;
2161
2162         status = nfs4_proc_fs_locations(dir, name, locations, page);
2163         if (status != 0)
2164                 goto out;
2165         /* Make sure server returned a different fsid for the referral */
2166         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2167                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2168                 status = -EIO;
2169                 goto out;
2170         }
2171
2172         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2173         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2174         if (!fattr->mode)
2175                 fattr->mode = S_IFDIR;
2176         memset(fhandle, 0, sizeof(struct nfs_fh));
2177 out:
2178         if (page)
2179                 __free_page(page);
2180         kfree(locations);
2181         return status;
2182 }
2183
2184 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2185 {
2186         struct nfs4_getattr_arg args = {
2187                 .fh = fhandle,
2188                 .bitmask = server->attr_bitmask,
2189         };
2190         struct nfs4_getattr_res res = {
2191                 .fattr = fattr,
2192                 .server = server,
2193         };
2194         struct rpc_message msg = {
2195                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2196                 .rpc_argp = &args,
2197                 .rpc_resp = &res,
2198         };
2199
2200         nfs_fattr_init(fattr);
2201         return nfs4_call_sync(server, &msg, &args, &res, 0);
2202 }
2203
2204 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2205 {
2206         struct nfs4_exception exception = { };
2207         int err;
2208         do {
2209                 err = nfs4_handle_exception(server,
2210                                 _nfs4_proc_getattr(server, fhandle, fattr),
2211                                 &exception);
2212         } while (exception.retry);
2213         return err;
2214 }
2215
2216 /*
2217  * The file is not closed if it is opened due to the a request to change
2218  * the size of the file. The open call will not be needed once the
2219  * VFS layer lookup-intents are implemented.
2220  *
2221  * Close is called when the inode is destroyed.
2222  * If we haven't opened the file for O_WRONLY, we
2223  * need to in the size_change case to obtain a stateid.
2224  *
2225  * Got race?
2226  * Because OPEN is always done by name in nfsv4, it is
2227  * possible that we opened a different file by the same
2228  * name.  We can recognize this race condition, but we
2229  * can't do anything about it besides returning an error.
2230  *
2231  * This will be fixed with VFS changes (lookup-intent).
2232  */
2233 static int
2234 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2235                   struct iattr *sattr)
2236 {
2237         struct inode *inode = dentry->d_inode;
2238         struct rpc_cred *cred = NULL;
2239         struct nfs4_state *state = NULL;
2240         int status;
2241
2242         nfs_fattr_init(fattr);
2243
2244         /* Search for an existing open(O_WRITE) file */
2245         if (sattr->ia_valid & ATTR_FILE) {
2246                 struct nfs_open_context *ctx;
2247
2248                 ctx = nfs_file_open_context(sattr->ia_file);
2249                 if (ctx) {
2250                         cred = ctx->cred;
2251                         state = ctx->state;
2252                 }
2253         }
2254
2255         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2256         if (status == 0)
2257                 nfs_setattr_update_inode(inode, sattr);
2258         return status;
2259 }
2260
2261 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2262                 const struct qstr *name, struct nfs_fh *fhandle,
2263                 struct nfs_fattr *fattr)
2264 {
2265         int                    status;
2266         struct nfs4_lookup_arg args = {
2267                 .bitmask = server->attr_bitmask,
2268                 .dir_fh = dirfh,
2269                 .name = name,
2270         };
2271         struct nfs4_lookup_res res = {
2272                 .server = server,
2273                 .fattr = fattr,
2274                 .fh = fhandle,
2275         };
2276         struct rpc_message msg = {
2277                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2278                 .rpc_argp = &args,
2279                 .rpc_resp = &res,
2280         };
2281
2282         nfs_fattr_init(fattr);
2283
2284         dprintk("NFS call  lookupfh %s\n", name->name);
2285         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2286         dprintk("NFS reply lookupfh: %d\n", status);
2287         return status;
2288 }
2289
2290 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2291                               struct qstr *name, struct nfs_fh *fhandle,
2292                               struct nfs_fattr *fattr)
2293 {
2294         struct nfs4_exception exception = { };
2295         int err;
2296         do {
2297                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2298                 /* FIXME: !!!! */
2299                 if (err == -NFS4ERR_MOVED) {
2300                         err = -EREMOTE;
2301                         break;
2302                 }
2303                 err = nfs4_handle_exception(server, err, &exception);
2304         } while (exception.retry);
2305         return err;
2306 }
2307
2308 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2309                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2310 {
2311         int status;
2312
2313         dprintk("NFS call  lookup %s\n", name->name);
2314         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2315         if (status == -NFS4ERR_MOVED)
2316                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2317         dprintk("NFS reply lookup: %d\n", status);
2318         return status;
2319 }
2320
2321 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2322 {
2323         struct nfs4_exception exception = { };
2324         int err;
2325         do {
2326                 err = nfs4_handle_exception(NFS_SERVER(dir),
2327                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2328                                 &exception);
2329         } while (exception.retry);
2330         return err;
2331 }
2332
2333 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2334 {
2335         struct nfs_server *server = NFS_SERVER(inode);
2336         struct nfs4_accessargs args = {
2337                 .fh = NFS_FH(inode),
2338                 .bitmask = server->attr_bitmask,
2339         };
2340         struct nfs4_accessres res = {
2341                 .server = server,
2342         };
2343         struct rpc_message msg = {
2344                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2345                 .rpc_argp = &args,
2346                 .rpc_resp = &res,
2347                 .rpc_cred = entry->cred,
2348         };
2349         int mode = entry->mask;
2350         int status;
2351
2352         /*
2353          * Determine which access bits we want to ask for...
2354          */
2355         if (mode & MAY_READ)
2356                 args.access |= NFS4_ACCESS_READ;
2357         if (S_ISDIR(inode->i_mode)) {
2358                 if (mode & MAY_WRITE)
2359                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2360                 if (mode & MAY_EXEC)
2361                         args.access |= NFS4_ACCESS_LOOKUP;
2362         } else {
2363                 if (mode & MAY_WRITE)
2364                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2365                 if (mode & MAY_EXEC)
2366                         args.access |= NFS4_ACCESS_EXECUTE;
2367         }
2368
2369         res.fattr = nfs_alloc_fattr();
2370         if (res.fattr == NULL)
2371                 return -ENOMEM;
2372
2373         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2374         if (!status) {
2375                 entry->mask = 0;
2376                 if (res.access & NFS4_ACCESS_READ)
2377                         entry->mask |= MAY_READ;
2378                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2379                         entry->mask |= MAY_WRITE;
2380                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2381                         entry->mask |= MAY_EXEC;
2382                 nfs_refresh_inode(inode, res.fattr);
2383         }
2384         nfs_free_fattr(res.fattr);
2385         return status;
2386 }
2387
2388 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2389 {
2390         struct nfs4_exception exception = { };
2391         int err;
2392         do {
2393                 err = nfs4_handle_exception(NFS_SERVER(inode),
2394                                 _nfs4_proc_access(inode, entry),
2395                                 &exception);
2396         } while (exception.retry);
2397         return err;
2398 }
2399
2400 /*
2401  * TODO: For the time being, we don't try to get any attributes
2402  * along with any of the zero-copy operations READ, READDIR,
2403  * READLINK, WRITE.
2404  *
2405  * In the case of the first three, we want to put the GETATTR
2406  * after the read-type operation -- this is because it is hard
2407  * to predict the length of a GETATTR response in v4, and thus
2408  * align the READ data correctly.  This means that the GETATTR
2409  * may end up partially falling into the page cache, and we should
2410  * shift it into the 'tail' of the xdr_buf before processing.
2411  * To do this efficiently, we need to know the total length
2412  * of data received, which doesn't seem to be available outside
2413  * of the RPC layer.
2414  *
2415  * In the case of WRITE, we also want to put the GETATTR after
2416  * the operation -- in this case because we want to make sure
2417  * we get the post-operation mtime and size.  This means that
2418  * we can't use xdr_encode_pages() as written: we need a variant
2419  * of it which would leave room in the 'tail' iovec.
2420  *
2421  * Both of these changes to the XDR layer would in fact be quite
2422  * minor, but I decided to leave them for a subsequent patch.
2423  */
2424 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2425                 unsigned int pgbase, unsigned int pglen)
2426 {
2427         struct nfs4_readlink args = {
2428                 .fh       = NFS_FH(inode),
2429                 .pgbase   = pgbase,
2430                 .pglen    = pglen,
2431                 .pages    = &page,
2432         };
2433         struct nfs4_readlink_res res;
2434         struct rpc_message msg = {
2435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2436                 .rpc_argp = &args,
2437                 .rpc_resp = &res,
2438         };
2439
2440         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2441 }
2442
2443 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2444                 unsigned int pgbase, unsigned int pglen)
2445 {
2446         struct nfs4_exception exception = { };
2447         int err;
2448         do {
2449                 err = nfs4_handle_exception(NFS_SERVER(inode),
2450                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2451                                 &exception);
2452         } while (exception.retry);
2453         return err;
2454 }
2455
2456 /*
2457  * Got race?
2458  * We will need to arrange for the VFS layer to provide an atomic open.
2459  * Until then, this create/open method is prone to inefficiency and race
2460  * conditions due to the lookup, create, and open VFS calls from sys_open()
2461  * placed on the wire.
2462  *
2463  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2464  * The file will be opened again in the subsequent VFS open call
2465  * (nfs4_proc_file_open).
2466  *
2467  * The open for read will just hang around to be used by any process that
2468  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2469  */
2470
2471 static int
2472 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2473                  int flags, struct nfs_open_context *ctx)
2474 {
2475         struct path my_path = {
2476                 .dentry = dentry,
2477         };
2478         struct path *path = &my_path;
2479         struct nfs4_state *state;
2480         struct rpc_cred *cred = NULL;
2481         fmode_t fmode = 0;
2482         int status = 0;
2483
2484         if (ctx != NULL) {
2485                 cred = ctx->cred;
2486                 path = &ctx->path;
2487                 fmode = ctx->mode;
2488         }
2489         sattr->ia_mode &= ~current_umask();
2490         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2491         d_drop(dentry);
2492         if (IS_ERR(state)) {
2493                 status = PTR_ERR(state);
2494                 goto out;
2495         }
2496         d_add(dentry, igrab(state->inode));
2497         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2498         if (ctx != NULL)
2499                 ctx->state = state;
2500         else
2501                 nfs4_close_sync(path, state, fmode);
2502 out:
2503         return status;
2504 }
2505
2506 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2507 {
2508         struct nfs_server *server = NFS_SERVER(dir);
2509         struct nfs_removeargs args = {
2510                 .fh = NFS_FH(dir),
2511                 .name.len = name->len,
2512                 .name.name = name->name,
2513                 .bitmask = server->attr_bitmask,
2514         };
2515         struct nfs_removeres res = {
2516                 .server = server,
2517         };
2518         struct rpc_message msg = {
2519                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2520                 .rpc_argp = &args,
2521                 .rpc_resp = &res,
2522         };
2523         int status = -ENOMEM;
2524
2525         res.dir_attr = nfs_alloc_fattr();
2526         if (res.dir_attr == NULL)
2527                 goto out;
2528
2529         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2530         if (status == 0) {
2531                 update_changeattr(dir, &res.cinfo);
2532                 nfs_post_op_update_inode(dir, res.dir_attr);
2533         }
2534         nfs_free_fattr(res.dir_attr);
2535 out:
2536         return status;
2537 }
2538
2539 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2540 {
2541         struct nfs4_exception exception = { };
2542         int err;
2543         do {
2544                 err = nfs4_handle_exception(NFS_SERVER(dir),
2545                                 _nfs4_proc_remove(dir, name),
2546                                 &exception);
2547         } while (exception.retry);
2548         return err;
2549 }
2550
2551 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2552 {
2553         struct nfs_server *server = NFS_SERVER(dir);
2554         struct nfs_removeargs *args = msg->rpc_argp;
2555         struct nfs_removeres *res = msg->rpc_resp;
2556
2557         args->bitmask = server->cache_consistency_bitmask;
2558         res->server = server;
2559         res->seq_res.sr_slot = NULL;
2560         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2561 }
2562
2563 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2564 {
2565         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2566
2567         if (!nfs4_sequence_done(task, &res->seq_res))
2568                 return 0;
2569         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2570                 return 0;
2571         update_changeattr(dir, &res->cinfo);
2572         nfs_post_op_update_inode(dir, res->dir_attr);
2573         return 1;
2574 }
2575
2576 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2577 {
2578         struct nfs_server *server = NFS_SERVER(dir);
2579         struct nfs_renameargs *arg = msg->rpc_argp;
2580         struct nfs_renameres *res = msg->rpc_resp;
2581
2582         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2583         arg->bitmask = server->attr_bitmask;
2584         res->server = server;
2585 }
2586
2587 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2588                                  struct inode *new_dir)
2589 {
2590         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2591
2592         if (!nfs4_sequence_done(task, &res->seq_res))
2593                 return 0;
2594         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2595                 return 0;
2596
2597         update_changeattr(old_dir, &res->old_cinfo);
2598         nfs_post_op_update_inode(old_dir, res->old_fattr);
2599         update_changeattr(new_dir, &res->new_cinfo);
2600         nfs_post_op_update_inode(new_dir, res->new_fattr);
2601         return 1;
2602 }
2603
2604 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2605                 struct inode *new_dir, struct qstr *new_name)
2606 {
2607         struct nfs_server *server = NFS_SERVER(old_dir);
2608         struct nfs_renameargs arg = {
2609                 .old_dir = NFS_FH(old_dir),
2610                 .new_dir = NFS_FH(new_dir),
2611                 .old_name = old_name,
2612                 .new_name = new_name,
2613                 .bitmask = server->attr_bitmask,
2614         };
2615         struct nfs_renameres res = {
2616                 .server = server,
2617         };
2618         struct rpc_message msg = {
2619                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2620                 .rpc_argp = &arg,
2621                 .rpc_resp = &res,
2622         };
2623         int status = -ENOMEM;
2624
2625         res.old_fattr = nfs_alloc_fattr();
2626         res.new_fattr = nfs_alloc_fattr();
2627         if (res.old_fattr == NULL || res.new_fattr == NULL)
2628                 goto out;
2629
2630         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2631         if (!status) {
2632                 update_changeattr(old_dir, &res.old_cinfo);
2633                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2634                 update_changeattr(new_dir, &res.new_cinfo);
2635                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2636         }
2637 out:
2638         nfs_free_fattr(res.new_fattr);
2639         nfs_free_fattr(res.old_fattr);
2640         return status;
2641 }
2642
2643 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2644                 struct inode *new_dir, struct qstr *new_name)
2645 {
2646         struct nfs4_exception exception = { };
2647         int err;
2648         do {
2649                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2650                                 _nfs4_proc_rename(old_dir, old_name,
2651                                         new_dir, new_name),
2652                                 &exception);
2653         } while (exception.retry);
2654         return err;
2655 }
2656
2657 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2658 {
2659         struct nfs_server *server = NFS_SERVER(inode);
2660         struct nfs4_link_arg arg = {
2661                 .fh     = NFS_FH(inode),
2662                 .dir_fh = NFS_FH(dir),
2663                 .name   = name,
2664                 .bitmask = server->attr_bitmask,
2665         };
2666         struct nfs4_link_res res = {
2667                 .server = server,
2668         };
2669         struct rpc_message msg = {
2670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2671                 .rpc_argp = &arg,
2672                 .rpc_resp = &res,
2673         };
2674         int status = -ENOMEM;
2675
2676         res.fattr = nfs_alloc_fattr();
2677         res.dir_attr = nfs_alloc_fattr();
2678         if (res.fattr == NULL || res.dir_attr == NULL)
2679                 goto out;
2680
2681         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2682         if (!status) {
2683                 update_changeattr(dir, &res.cinfo);
2684                 nfs_post_op_update_inode(dir, res.dir_attr);
2685                 nfs_post_op_update_inode(inode, res.fattr);
2686         }
2687 out:
2688         nfs_free_fattr(res.dir_attr);
2689         nfs_free_fattr(res.fattr);
2690         return status;
2691 }
2692
2693 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2694 {
2695         struct nfs4_exception exception = { };
2696         int err;
2697         do {
2698                 err = nfs4_handle_exception(NFS_SERVER(inode),
2699                                 _nfs4_proc_link(inode, dir, name),
2700                                 &exception);
2701         } while (exception.retry);
2702         return err;
2703 }
2704
2705 struct nfs4_createdata {
2706         struct rpc_message msg;
2707         struct nfs4_create_arg arg;
2708         struct nfs4_create_res res;
2709         struct nfs_fh fh;
2710         struct nfs_fattr fattr;
2711         struct nfs_fattr dir_fattr;
2712 };
2713
2714 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2715                 struct qstr *name, struct iattr *sattr, u32 ftype)
2716 {
2717         struct nfs4_createdata *data;
2718
2719         data = kzalloc(sizeof(*data), GFP_KERNEL);
2720         if (data != NULL) {
2721                 struct nfs_server *server = NFS_SERVER(dir);
2722
2723                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2724                 data->msg.rpc_argp = &data->arg;
2725                 data->msg.rpc_resp = &data->res;
2726                 data->arg.dir_fh = NFS_FH(dir);
2727                 data->arg.server = server;
2728                 data->arg.name = name;
2729                 data->arg.attrs = sattr;
2730                 data->arg.ftype = ftype;
2731                 data->arg.bitmask = server->attr_bitmask;
2732                 data->res.server = server;
2733                 data->res.fh = &data->fh;
2734                 data->res.fattr = &data->fattr;
2735                 data->res.dir_fattr = &data->dir_fattr;
2736                 nfs_fattr_init(data->res.fattr);
2737                 nfs_fattr_init(data->res.dir_fattr);
2738         }
2739         return data;
2740 }
2741
2742 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2743 {
2744         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2745                                     &data->arg, &data->res, 1);
2746         if (status == 0) {
2747                 update_changeattr(dir, &data->res.dir_cinfo);
2748                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2749                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2750         }
2751         return status;
2752 }
2753
2754 static void nfs4_free_createdata(struct nfs4_createdata *data)
2755 {
2756         kfree(data);
2757 }
2758
2759 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2760                 struct page *page, unsigned int len, struct iattr *sattr)
2761 {
2762         struct nfs4_createdata *data;
2763         int status = -ENAMETOOLONG;
2764
2765         if (len > NFS4_MAXPATHLEN)
2766                 goto out;
2767
2768         status = -ENOMEM;
2769         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2770         if (data == NULL)
2771                 goto out;
2772
2773         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2774         data->arg.u.symlink.pages = &page;
2775         data->arg.u.symlink.len = len;
2776
2777         status = nfs4_do_create(dir, dentry, data);
2778
2779         nfs4_free_createdata(data);
2780 out:
2781         return status;
2782 }
2783
2784 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2785                 struct page *page, unsigned int len, struct iattr *sattr)
2786 {
2787         struct nfs4_exception exception = { };
2788         int err;
2789         do {
2790                 err = nfs4_handle_exception(NFS_SERVER(dir),
2791                                 _nfs4_proc_symlink(dir, dentry, page,
2792                                                         len, sattr),
2793                                 &exception);
2794         } while (exception.retry);
2795         return err;
2796 }
2797
2798 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2799                 struct iattr *sattr)
2800 {
2801         struct nfs4_createdata *data;
2802         int status = -ENOMEM;
2803
2804         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2805         if (data == NULL)
2806                 goto out;
2807
2808         status = nfs4_do_create(dir, dentry, data);
2809
2810         nfs4_free_createdata(data);
2811 out:
2812         return status;
2813 }
2814
2815 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2816                 struct iattr *sattr)
2817 {
2818         struct nfs4_exception exception = { };
2819         int err;
2820
2821         sattr->ia_mode &= ~current_umask();
2822         do {
2823                 err = nfs4_handle_exception(NFS_SERVER(dir),
2824                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2825                                 &exception);
2826         } while (exception.retry);
2827         return err;
2828 }
2829
2830 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2831                 u64 cookie, struct page **pages, unsigned int count, int plus)
2832 {
2833         struct inode            *dir = dentry->d_inode;
2834         struct nfs4_readdir_arg args = {
2835                 .fh = NFS_FH(dir),
2836                 .pages = pages,
2837                 .pgbase = 0,
2838                 .count = count,
2839                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2840                 .plus = plus,
2841         };
2842         struct nfs4_readdir_res res;
2843         struct rpc_message msg = {
2844                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2845                 .rpc_argp = &args,
2846                 .rpc_resp = &res,
2847                 .rpc_cred = cred,
2848         };
2849         int                     status;
2850
2851         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2852                         dentry->d_parent->d_name.name,
2853                         dentry->d_name.name,
2854                         (unsigned long long)cookie);
2855         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2856         res.pgbase = args.pgbase;
2857         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2858         if (status >= 0) {
2859                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2860                 status += args.pgbase;
2861         }
2862
2863         nfs_invalidate_atime(dir);
2864
2865         dprintk("%s: returns %d\n", __func__, status);
2866         return status;
2867 }
2868
2869 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2870                 u64 cookie, struct page **pages, unsigned int count, int plus)
2871 {
2872         struct nfs4_exception exception = { };
2873         int err;
2874         do {
2875                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2876                                 _nfs4_proc_readdir(dentry, cred, cookie,
2877                                         pages, count, plus),
2878                                 &exception);
2879         } while (exception.retry);
2880         return err;
2881 }
2882
2883 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2884                 struct iattr *sattr, dev_t rdev)
2885 {
2886         struct nfs4_createdata *data;
2887         int mode = sattr->ia_mode;
2888         int status = -ENOMEM;
2889
2890         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2891         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2892
2893         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2894         if (data == NULL)
2895                 goto out;
2896
2897         if (S_ISFIFO(mode))
2898                 data->arg.ftype = NF4FIFO;
2899         else if (S_ISBLK(mode)) {
2900                 data->arg.ftype = NF4BLK;
2901                 data->arg.u.device.specdata1 = MAJOR(rdev);
2902                 data->arg.u.device.specdata2 = MINOR(rdev);
2903         }
2904         else if (S_ISCHR(mode)) {
2905                 data->arg.ftype = NF4CHR;
2906                 data->arg.u.device.specdata1 = MAJOR(rdev);
2907                 data->arg.u.device.specdata2 = MINOR(rdev);
2908         }
2909
2910         status = nfs4_do_create(dir, dentry, data);
2911
2912         nfs4_free_createdata(data);
2913 out:
2914         return status;
2915 }
2916
2917 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2918                 struct iattr *sattr, dev_t rdev)
2919 {
2920         struct nfs4_exception exception = { };
2921         int err;
2922
2923         sattr->ia_mode &= ~current_umask();
2924         do {
2925                 err = nfs4_handle_exception(NFS_SERVER(dir),
2926                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2927                                 &exception);
2928         } while (exception.retry);
2929         return err;
2930 }
2931
2932 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2933                  struct nfs_fsstat *fsstat)
2934 {
2935         struct nfs4_statfs_arg args = {
2936                 .fh = fhandle,
2937                 .bitmask = server->attr_bitmask,
2938         };
2939         struct nfs4_statfs_res res = {
2940                 .fsstat = fsstat,
2941         };
2942         struct rpc_message msg = {
2943                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2944                 .rpc_argp = &args,
2945                 .rpc_resp = &res,
2946         };
2947
2948         nfs_fattr_init(fsstat->fattr);
2949         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2950 }
2951
2952 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2953 {
2954         struct nfs4_exception exception = { };
2955         int err;
2956         do {
2957                 err = nfs4_handle_exception(server,
2958                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2959                                 &exception);
2960         } while (exception.retry);
2961         return err;
2962 }
2963
2964 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2965                 struct nfs_fsinfo *fsinfo)
2966 {
2967         struct nfs4_fsinfo_arg args = {
2968                 .fh = fhandle,
2969                 .bitmask = server->attr_bitmask,
2970         };
2971         struct nfs4_fsinfo_res res = {
2972                 .fsinfo = fsinfo,
2973         };
2974         struct rpc_message msg = {
2975                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2976                 .rpc_argp = &args,
2977                 .rpc_resp = &res,
2978         };
2979
2980         return nfs4_call_sync(server, &msg, &args, &res, 0);
2981 }
2982
2983 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2984 {
2985         struct nfs4_exception exception = { };
2986         int err;
2987
2988         do {
2989                 err = nfs4_handle_exception(server,
2990                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2991                                 &exception);
2992         } while (exception.retry);
2993         return err;
2994 }
2995
2996 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2997 {
2998         nfs_fattr_init(fsinfo->fattr);
2999         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3000 }
3001
3002 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3003                 struct nfs_pathconf *pathconf)
3004 {
3005         struct nfs4_pathconf_arg args = {
3006                 .fh = fhandle,
3007                 .bitmask = server->attr_bitmask,
3008         };
3009         struct nfs4_pathconf_res res = {
3010                 .pathconf = pathconf,
3011         };
3012         struct rpc_message msg = {
3013                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3014                 .rpc_argp = &args,
3015                 .rpc_resp = &res,
3016         };
3017
3018         /* None of the pathconf attributes are mandatory to implement */
3019         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3020                 memset(pathconf, 0, sizeof(*pathconf));
3021                 return 0;
3022         }
3023
3024         nfs_fattr_init(pathconf->fattr);
3025         return nfs4_call_sync(server, &msg, &args, &res, 0);
3026 }
3027
3028 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3029                 struct nfs_pathconf *pathconf)
3030 {
3031         struct nfs4_exception exception = { };
3032         int err;
3033
3034         do {
3035                 err = nfs4_handle_exception(server,
3036                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3037                                 &exception);
3038         } while (exception.retry);
3039         return err;
3040 }
3041
3042 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3043 {
3044         struct nfs_server *server = NFS_SERVER(data->inode);
3045
3046         dprintk("--> %s\n", __func__);
3047
3048         if (!nfs4_sequence_done(task, &data->res.seq_res))
3049                 return -EAGAIN;
3050
3051         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3052                 nfs_restart_rpc(task, server->nfs_client);
3053                 return -EAGAIN;
3054         }
3055
3056         nfs_invalidate_atime(data->inode);
3057         if (task->tk_status > 0)
3058                 renew_lease(server, data->timestamp);
3059         return 0;
3060 }
3061
3062 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3063 {
3064         data->timestamp   = jiffies;
3065         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3066 }
3067
3068 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3069 {
3070         struct inode *inode = data->inode;
3071
3072         if (!nfs4_sequence_done(task, &data->res.seq_res))
3073                 return -EAGAIN;
3074
3075         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3076                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3077                 return -EAGAIN;
3078         }
3079         if (task->tk_status >= 0) {
3080                 renew_lease(NFS_SERVER(inode), data->timestamp);
3081                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3082         }
3083         return 0;
3084 }
3085
3086 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3087 {
3088         struct nfs_server *server = NFS_SERVER(data->inode);
3089
3090         data->args.bitmask = server->cache_consistency_bitmask;
3091         data->res.server = server;
3092         data->timestamp   = jiffies;
3093
3094         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3095 }
3096
3097 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3098 {
3099         struct inode *inode = data->inode;
3100
3101         if (!nfs4_sequence_done(task, &data->res.seq_res))
3102                 return -EAGAIN;
3103
3104         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3105                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3106                 return -EAGAIN;
3107         }
3108         nfs_refresh_inode(inode, data->res.fattr);
3109         return 0;
3110 }
3111
3112 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3113 {
3114         struct nfs_server *server = NFS_SERVER(data->inode);
3115
3116         data->args.bitmask = server->cache_consistency_bitmask;
3117         data->res.server = server;
3118         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3119 }
3120
3121 struct nfs4_renewdata {
3122         struct nfs_client       *client;
3123         unsigned long           timestamp;
3124 };
3125
3126 /*
3127  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3128  * standalone procedure for queueing an asynchronous RENEW.
3129  */
3130 static void nfs4_renew_release(void *calldata)
3131 {
3132         struct nfs4_renewdata *data = calldata;
3133         struct nfs_client *clp = data->client;
3134
3135         if (atomic_read(&clp->cl_count) > 1)
3136                 nfs4_schedule_state_renewal(clp);
3137         nfs_put_client(clp);
3138         kfree(data);
3139 }
3140
3141 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3142 {
3143         struct nfs4_renewdata *data = calldata;
3144         struct nfs_client *clp = data->client;
3145         unsigned long timestamp = data->timestamp;
3146
3147         if (task->tk_status < 0) {
3148                 /* Unless we're shutting down, schedule state recovery! */
3149                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3150                         nfs4_schedule_state_recovery(clp);
3151                 return;
3152         }
3153         do_renew_lease(clp, timestamp);
3154 }
3155
3156 static const struct rpc_call_ops nfs4_renew_ops = {
3157         .rpc_call_done = nfs4_renew_done,
3158         .rpc_release = nfs4_renew_release,
3159 };
3160
3161 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3162 {
3163         struct rpc_message msg = {
3164                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3165                 .rpc_argp       = clp,
3166                 .rpc_cred       = cred,
3167         };
3168         struct nfs4_renewdata *data;
3169
3170         if (!atomic_inc_not_zero(&clp->cl_count))
3171                 return -EIO;
3172         data = kmalloc(sizeof(*data), GFP_KERNEL);
3173         if (data == NULL)
3174                 return -ENOMEM;
3175         data->client = clp;
3176         data->timestamp = jiffies;
3177         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3178                         &nfs4_renew_ops, data);
3179 }
3180
3181 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3182 {
3183         struct rpc_message msg = {
3184                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3185                 .rpc_argp       = clp,
3186                 .rpc_cred       = cred,
3187         };
3188         unsigned long now = jiffies;
3189         int status;
3190
3191         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3192         if (status < 0)
3193                 return status;
3194         do_renew_lease(clp, now);
3195         return 0;
3196 }
3197
3198 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3199 {
3200         return (server->caps & NFS_CAP_ACLS)
3201                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3202                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3203 }
3204
3205 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3206  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3207  * the stack.
3208  */
3209 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3210
3211 static void buf_to_pages(const void *buf, size_t buflen,
3212                 struct page **pages, unsigned int *pgbase)
3213 {
3214         const void *p = buf;
3215
3216         *pgbase = offset_in_page(buf);
3217         p -= *pgbase;
3218         while (p < buf + buflen) {
3219                 *(pages++) = virt_to_page(p);
3220                 p += PAGE_CACHE_SIZE;
3221         }
3222 }
3223
3224 struct nfs4_cached_acl {
3225         int cached;
3226         size_t len;
3227         char data[0];
3228 };
3229
3230 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3231 {
3232         struct nfs_inode *nfsi = NFS_I(inode);
3233
3234         spin_lock(&inode->i_lock);
3235         kfree(nfsi->nfs4_acl);
3236         nfsi->nfs4_acl = acl;
3237         spin_unlock(&inode->i_lock);
3238 }
3239
3240 static void nfs4_zap_acl_attr(struct inode *inode)
3241 {
3242         nfs4_set_cached_acl(inode, NULL);
3243 }
3244
3245 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3246 {
3247         struct nfs_inode *nfsi = NFS_I(inode);
3248         struct nfs4_cached_acl *acl;
3249         int ret = -ENOENT;
3250
3251         spin_lock(&inode->i_lock);
3252         acl = nfsi->nfs4_acl;
3253         if (acl == NULL)
3254                 goto out;
3255         if (buf == NULL) /* user is just asking for length */
3256                 goto out_len;
3257         if (acl->cached == 0)
3258                 goto out;
3259         ret = -ERANGE; /* see getxattr(2) man page */
3260         if (acl->len > buflen)
3261                 goto out;
3262         memcpy(buf, acl->data, acl->len);
3263 out_len:
3264         ret = acl->len;
3265 out:
3266         spin_unlock(&inode->i_lock);
3267         return ret;
3268 }
3269
3270 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3271 {
3272         struct nfs4_cached_acl *acl;
3273
3274         if (buf && acl_len <= PAGE_SIZE) {
3275                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3276                 if (acl == NULL)
3277                         goto out;
3278                 acl->cached = 1;
3279                 memcpy(acl->data, buf, acl_len);
3280         } else {
3281                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3282                 if (acl == NULL)
3283                         goto out;
3284                 acl->cached = 0;
3285         }
3286         acl->len = acl_len;
3287 out:
3288         nfs4_set_cached_acl(inode, acl);
3289 }
3290
3291 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3292 {
3293         struct page *pages[NFS4ACL_MAXPAGES];
3294         struct nfs_getaclargs args = {
3295                 .fh = NFS_FH(inode),
3296                 .acl_pages = pages,
3297                 .acl_len = buflen,
3298         };
3299         struct nfs_getaclres res = {
3300                 .acl_len = buflen,
3301         };
3302         void *resp_buf;
3303         struct rpc_message msg = {
3304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3305                 .rpc_argp = &args,
3306                 .rpc_resp = &res,
3307         };
3308         struct page *localpage = NULL;
3309         int ret;
3310
3311         if (buflen < PAGE_SIZE) {
3312                 /* As long as we're doing a round trip to the server anyway,
3313                  * let's be prepared for a page of acl data. */
3314                 localpage = alloc_page(GFP_KERNEL);
3315                 resp_buf = page_address(localpage);
3316                 if (localpage == NULL)
3317                         return -ENOMEM;
3318                 args.acl_pages[0] = localpage;
3319                 args.acl_pgbase = 0;
3320                 args.acl_len = PAGE_SIZE;
3321         } else {
3322                 resp_buf = buf;
3323                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3324         }
3325         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3326         if (ret)
3327                 goto out_free;
3328         if (res.acl_len > args.acl_len)
3329                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3330         else
3331                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3332         if (buf) {
3333                 ret = -ERANGE;
3334                 if (res.acl_len > buflen)
3335                         goto out_free;
3336                 if (localpage)
3337                         memcpy(buf, resp_buf, res.acl_len);
3338         }
3339         ret = res.acl_len;
3340 out_free:
3341         if (localpage)
3342                 __free_page(localpage);
3343         return ret;
3344 }
3345
3346 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3347 {
3348         struct nfs4_exception exception = { };
3349         ssize_t ret;
3350         do {
3351                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3352                 if (ret >= 0)
3353                         break;
3354                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3355         } while (exception.retry);
3356         return ret;
3357 }
3358
3359 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3360 {
3361         struct nfs_server *server = NFS_SERVER(inode);
3362         int ret;
3363
3364         if (!nfs4_server_supports_acls(server))
3365                 return -EOPNOTSUPP;
3366         ret = nfs_revalidate_inode(server, inode);
3367         if (ret < 0)
3368                 return ret;
3369         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3370                 nfs_zap_acl_cache(inode);
3371         ret = nfs4_read_cached_acl(inode, buf, buflen);
3372         if (ret != -ENOENT)
3373                 return ret;
3374         return nfs4_get_acl_uncached(inode, buf, buflen);
3375 }
3376
3377 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3378 {
3379         struct nfs_server *server = NFS_SERVER(inode);
3380         struct page *pages[NFS4ACL_MAXPAGES];
3381         struct nfs_setaclargs arg = {
3382                 .fh             = NFS_FH(inode),
3383                 .acl_pages      = pages,
3384                 .acl_len        = buflen,
3385         };
3386         struct nfs_setaclres res;
3387         struct rpc_message msg = {
3388                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3389                 .rpc_argp       = &arg,
3390                 .rpc_resp       = &res,
3391         };
3392         int ret;
3393
3394         if (!nfs4_server_supports_acls(server))
3395                 return -EOPNOTSUPP;
3396         nfs_inode_return_delegation(inode);
3397         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3398         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3399         /*
3400          * Acl update can result in inode attribute update.
3401          * so mark the attribute cache invalid.
3402          */
3403         spin_lock(&inode->i_lock);
3404         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3405         spin_unlock(&inode->i_lock);
3406         nfs_access_zap_cache(inode);
3407         nfs_zap_acl_cache(inode);
3408         return ret;
3409 }
3410
3411 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3412 {
3413         struct nfs4_exception exception = { };
3414         int err;
3415         do {
3416                 err = nfs4_handle_exception(NFS_SERVER(inode),
3417                                 __nfs4_proc_set_acl(inode, buf, buflen),
3418                                 &exception);
3419         } while (exception.retry);
3420         return err;
3421 }
3422
3423 static int
3424 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3425 {
3426         struct nfs_client *clp = server->nfs_client;
3427
3428         if (task->tk_status >= 0)
3429                 return 0;
3430         switch(task->tk_status) {
3431                 case -NFS4ERR_ADMIN_REVOKED:
3432                 case -NFS4ERR_BAD_STATEID:
3433                 case -NFS4ERR_OPENMODE:
3434                         if (state == NULL)
3435                                 break;
3436                         nfs4_state_mark_reclaim_nograce(clp, state);
3437                         goto do_state_recovery;
3438                 case -NFS4ERR_STALE_STATEID:
3439                 case -NFS4ERR_STALE_CLIENTID:
3440                 case -NFS4ERR_EXPIRED:
3441                         goto do_state_recovery;
3442 #if defined(CONFIG_NFS_V4_1)
3443                 case -NFS4ERR_BADSESSION:
3444                 case -NFS4ERR_BADSLOT:
3445                 case -NFS4ERR_BAD_HIGH_SLOT:
3446                 case -NFS4ERR_DEADSESSION:
3447                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3448                 case -NFS4ERR_SEQ_FALSE_RETRY:
3449                 case -NFS4ERR_SEQ_MISORDERED:
3450                         dprintk("%s ERROR %d, Reset session\n", __func__,
3451                                 task->tk_status);
3452                         nfs4_schedule_state_recovery(clp);
3453                         task->tk_status = 0;
3454                         return -EAGAIN;
3455 #endif /* CONFIG_NFS_V4_1 */
3456                 case -NFS4ERR_DELAY:
3457                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3458                 case -NFS4ERR_GRACE:
3459                 case -EKEYEXPIRED:
3460                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3461                         task->tk_status = 0;
3462                         return -EAGAIN;
3463                 case -NFS4ERR_OLD_STATEID:
3464                         task->tk_status = 0;
3465                         return -EAGAIN;
3466         }
3467         task->tk_status = nfs4_map_errors(task->tk_status);
3468         return 0;
3469 do_state_recovery:
3470         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3471         nfs4_schedule_state_recovery(clp);
3472         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3473                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3474         task->tk_status = 0;
3475         return -EAGAIN;
3476 }
3477
3478 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3479                 unsigned short port, struct rpc_cred *cred,
3480                 struct nfs4_setclientid_res *res)
3481 {
3482         nfs4_verifier sc_verifier;
3483         struct nfs4_setclientid setclientid = {
3484                 .sc_verifier = &sc_verifier,
3485                 .sc_prog = program,
3486         };
3487         struct rpc_message msg = {
3488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3489                 .rpc_argp = &setclientid,
3490                 .rpc_resp = res,
3491                 .rpc_cred = cred,
3492         };
3493         __be32 *p;
3494         int loop = 0;
3495         int status;
3496
3497         p = (__be32*)sc_verifier.data;
3498         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3499         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3500
3501         for(;;) {
3502                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3503                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3504                                 clp->cl_ipaddr,
3505                                 rpc_peeraddr2str(clp->cl_rpcclient,
3506                                                         RPC_DISPLAY_ADDR),
3507                                 rpc_peeraddr2str(clp->cl_rpcclient,
3508                                                         RPC_DISPLAY_PROTO),
3509                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3510                                 clp->cl_id_uniquifier);
3511                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3512                                 sizeof(setclientid.sc_netid),
3513                                 rpc_peeraddr2str(clp->cl_rpcclient,
3514                                                         RPC_DISPLAY_NETID));
3515                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3516                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3517                                 clp->cl_ipaddr, port >> 8, port & 255);
3518
3519                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3520                 if (status != -NFS4ERR_CLID_INUSE)
3521                         break;
3522                 if (signalled())
3523                         break;
3524                 if (loop++ & 1)
3525                         ssleep(clp->cl_lease_time / HZ + 1);
3526                 else
3527                         if (++clp->cl_id_uniquifier == 0)
3528                                 break;
3529         }
3530         return status;
3531 }
3532
3533 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3534                 struct nfs4_setclientid_res *arg,
3535                 struct rpc_cred *cred)
3536 {
3537         struct nfs_fsinfo fsinfo;
3538         struct rpc_message msg = {
3539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3540                 .rpc_argp = arg,
3541                 .rpc_resp = &fsinfo,
3542                 .rpc_cred = cred,
3543         };
3544         unsigned long now;
3545         int status;
3546
3547         now = jiffies;
3548         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3549         if (status == 0) {
3550                 spin_lock(&clp->cl_lock);
3551                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3552                 clp->cl_last_renewal = now;
3553                 spin_unlock(&clp->cl_lock);
3554         }
3555         return status;
3556 }
3557
3558 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3559                 struct nfs4_setclientid_res *arg,
3560                 struct rpc_cred *cred)
3561 {
3562         long timeout = 0;
3563         int err;
3564         do {
3565                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3566                 switch (err) {
3567                         case 0:
3568                                 return err;
3569                         case -NFS4ERR_RESOURCE:
3570                                 /* The IBM lawyers misread another document! */
3571                         case -NFS4ERR_DELAY:
3572                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3573                 }
3574         } while (err == 0);
3575         return err;
3576 }
3577
3578 struct nfs4_delegreturndata {
3579         struct nfs4_delegreturnargs args;
3580         struct nfs4_delegreturnres res;
3581         struct nfs_fh fh;
3582         nfs4_stateid stateid;
3583         unsigned long timestamp;
3584         struct nfs_fattr fattr;
3585         int rpc_status;
3586 };
3587
3588 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3589 {
3590         struct nfs4_delegreturndata *data = calldata;
3591
3592         if (!nfs4_sequence_done(task, &data->res.seq_res))
3593                 return;
3594
3595         switch (task->tk_status) {
3596         case -NFS4ERR_STALE_STATEID:
3597         case -NFS4ERR_EXPIRED:
3598         case 0:
3599                 renew_lease(data->res.server, data->timestamp);
3600                 break;
3601         default:
3602                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3603                                 -EAGAIN) {
3604                         nfs_restart_rpc(task, data->res.server->nfs_client);
3605                         return;
3606                 }
3607         }
3608         data->rpc_status = task->tk_status;
3609 }
3610
3611 static void nfs4_delegreturn_release(void *calldata)
3612 {
3613         kfree(calldata);
3614 }
3615
3616 #if defined(CONFIG_NFS_V4_1)
3617 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3618 {
3619         struct nfs4_delegreturndata *d_data;
3620
3621         d_data = (struct nfs4_delegreturndata *)data;
3622
3623         if (nfs4_setup_sequence(d_data->res.server,
3624                                 &d_data->args.seq_args,
3625                                 &d_data->res.seq_res, 1, task))
3626                 return;
3627         rpc_call_start(task);
3628 }
3629 #endif /* CONFIG_NFS_V4_1 */
3630
3631 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3632 #if defined(CONFIG_NFS_V4_1)
3633         .rpc_call_prepare = nfs4_delegreturn_prepare,
3634 #endif /* CONFIG_NFS_V4_1 */
3635         .rpc_call_done = nfs4_delegreturn_done,
3636         .rpc_release = nfs4_delegreturn_release,
3637 };
3638
3639 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3640 {
3641         struct nfs4_delegreturndata *data;
3642         struct nfs_server *server = NFS_SERVER(inode);
3643         struct rpc_task *task;
3644         struct rpc_message msg = {
3645                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3646                 .rpc_cred = cred,
3647         };
3648         struct rpc_task_setup task_setup_data = {
3649                 .rpc_client = server->client,
3650                 .rpc_message = &msg,
3651                 .callback_ops = &nfs4_delegreturn_ops,
3652                 .flags = RPC_TASK_ASYNC,
3653         };
3654         int status = 0;
3655
3656         data = kzalloc(sizeof(*data), GFP_NOFS);
3657         if (data == NULL)
3658                 return -ENOMEM;
3659         data->args.fhandle = &data->fh;
3660         data->args.stateid = &data->stateid;
3661         data->args.bitmask = server->attr_bitmask;
3662         nfs_copy_fh(&data->fh, NFS_FH(inode));
3663         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3664         data->res.fattr = &data->fattr;
3665         data->res.server = server;
3666         nfs_fattr_init(data->res.fattr);
3667         data->timestamp = jiffies;
3668         data->rpc_status = 0;
3669
3670         task_setup_data.callback_data = data;
3671         msg.rpc_argp = &data->args;
3672         msg.rpc_resp = &data->res;
3673         task = rpc_run_task(&task_setup_data);
3674         if (IS_ERR(task))
3675                 return PTR_ERR(task);
3676         if (!issync)
3677                 goto out;
3678         status = nfs4_wait_for_completion_rpc_task(task);
3679         if (status != 0)
3680                 goto out;
3681         status = data->rpc_status;
3682         if (status != 0)
3683                 goto out;
3684         nfs_refresh_inode(inode, &data->fattr);
3685 out:
3686         rpc_put_task(task);
3687         return status;
3688 }
3689
3690 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3691 {
3692         struct nfs_server *server = NFS_SERVER(inode);
3693         struct nfs4_exception exception = { };
3694         int err;
3695         do {
3696                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3697                 switch (err) {
3698                         case -NFS4ERR_STALE_STATEID:
3699                         case -NFS4ERR_EXPIRED:
3700                         case 0:
3701                                 return 0;
3702                 }
3703                 err = nfs4_handle_exception(server, err, &exception);
3704         } while (exception.retry);
3705         return err;
3706 }
3707
3708 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3709 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3710
3711 /*
3712  * sleep, with exponential backoff, and retry the LOCK operation.
3713  */
3714 static unsigned long
3715 nfs4_set_lock_task_retry(unsigned long timeout)
3716 {
3717         schedule_timeout_killable(timeout);
3718         timeout <<= 1;
3719         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3720                 return NFS4_LOCK_MAXTIMEOUT;
3721         return timeout;
3722 }
3723
3724 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3725 {
3726         struct inode *inode = state->inode;
3727         struct nfs_server *server = NFS_SERVER(inode);
3728         struct nfs_client *clp = server->nfs_client;
3729         struct nfs_lockt_args arg = {
3730                 .fh = NFS_FH(inode),
3731                 .fl = request,
3732         };
3733         struct nfs_lockt_res res = {
3734                 .denied = request,
3735         };
3736         struct rpc_message msg = {
3737                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3738                 .rpc_argp       = &arg,
3739                 .rpc_resp       = &res,
3740                 .rpc_cred       = state->owner->so_cred,
3741         };
3742         struct nfs4_lock_state *lsp;
3743         int status;
3744
3745         arg.lock_owner.clientid = clp->cl_clientid;
3746         status = nfs4_set_lock_state(state, request);
3747         if (status != 0)
3748                 goto out;
3749         lsp = request->fl_u.nfs4_fl.owner;
3750         arg.lock_owner.id = lsp->ls_id.id;
3751         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3752         switch (status) {
3753                 case 0:
3754                         request->fl_type = F_UNLCK;
3755                         break;
3756                 case -NFS4ERR_DENIED:
3757                         status = 0;
3758         }
3759         request->fl_ops->fl_release_private(request);
3760 out:
3761         return status;
3762 }
3763
3764 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3765 {
3766         struct nfs4_exception exception = { };
3767         int err;
3768
3769         do {
3770                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3771                                 _nfs4_proc_getlk(state, cmd, request),
3772                                 &exception);
3773         } while (exception.retry);
3774         return err;
3775 }
3776
3777 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3778 {
3779         int res = 0;
3780         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3781                 case FL_POSIX:
3782                         res = posix_lock_file_wait(file, fl);
3783                         break;
3784                 case FL_FLOCK:
3785                         res = flock_lock_file_wait(file, fl);
3786                         break;
3787                 default:
3788                         BUG();
3789         }
3790         return res;
3791 }
3792
3793 struct nfs4_unlockdata {
3794         struct nfs_locku_args arg;
3795         struct nfs_locku_res res;
3796         struct nfs4_lock_state *lsp;
3797         struct nfs_open_context *ctx;
3798         struct file_lock fl;
3799         const struct nfs_server *server;
3800         unsigned long timestamp;
3801 };
3802
3803 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3804                 struct nfs_open_context *ctx,
3805                 struct nfs4_lock_state *lsp,
3806                 struct nfs_seqid *seqid)
3807 {
3808         struct nfs4_unlockdata *p;
3809         struct inode *inode = lsp->ls_state->inode;
3810
3811         p = kzalloc(sizeof(*p), GFP_NOFS);
3812         if (p == NULL)
3813                 return NULL;
3814         p->arg.fh = NFS_FH(inode);
3815         p->arg.fl = &p->fl;
3816         p->arg.seqid = seqid;
3817         p->res.seqid = seqid;
3818         p->arg.stateid = &lsp->ls_stateid;
3819         p->lsp = lsp;
3820         atomic_inc(&lsp->ls_count);
3821         /* Ensure we don't close file until we're done freeing locks! */
3822         p->ctx = get_nfs_open_context(ctx);
3823         memcpy(&p->fl, fl, sizeof(p->fl));
3824         p->server = NFS_SERVER(inode);
3825         return p;
3826 }
3827
3828 static void nfs4_locku_release_calldata(void *data)
3829 {
3830         struct nfs4_unlockdata *calldata = data;
3831         nfs_free_seqid(calldata->arg.seqid);
3832         nfs4_put_lock_state(calldata->lsp);
3833         put_nfs_open_context(calldata->ctx);
3834         kfree(calldata);
3835 }
3836
3837 static void nfs4_locku_done(struct rpc_task *task, void *data)
3838 {
3839         struct nfs4_unlockdata *calldata = data;
3840
3841         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3842                 return;
3843         switch (task->tk_status) {
3844                 case 0:
3845                         memcpy(calldata->lsp->ls_stateid.data,
3846                                         calldata->res.stateid.data,
3847                                         sizeof(calldata->lsp->ls_stateid.data));
3848                         renew_lease(calldata->server, calldata->timestamp);
3849                         break;
3850                 case -NFS4ERR_BAD_STATEID:
3851                 case -NFS4ERR_OLD_STATEID:
3852                 case -NFS4ERR_STALE_STATEID:
3853                 case -NFS4ERR_EXPIRED:
3854                         break;
3855                 default:
3856                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3857                                 nfs_restart_rpc(task,
3858                                                  calldata->server->nfs_client);
3859         }
3860 }
3861
3862 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3863 {
3864         struct nfs4_unlockdata *calldata = data;
3865
3866         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3867                 return;
3868         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3869                 /* Note: exit _without_ running nfs4_locku_done */
3870                 task->tk_action = NULL;
3871                 return;
3872         }
3873         calldata->timestamp = jiffies;
3874         if (nfs4_setup_sequence(calldata->server,
3875                                 &calldata->arg.seq_args,
3876                                 &calldata->res.seq_res, 1, task))
3877                 return;
3878         rpc_call_start(task);
3879 }
3880
3881 static const struct rpc_call_ops nfs4_locku_ops = {
3882         .rpc_call_prepare = nfs4_locku_prepare,
3883         .rpc_call_done = nfs4_locku_done,
3884         .rpc_release = nfs4_locku_release_calldata,
3885 };
3886
3887 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3888                 struct nfs_open_context *ctx,
3889                 struct nfs4_lock_state *lsp,
3890                 struct nfs_seqid *seqid)
3891 {
3892         struct nfs4_unlockdata *data;
3893         struct rpc_message msg = {
3894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3895                 .rpc_cred = ctx->cred,
3896         };
3897         struct rpc_task_setup task_setup_data = {
3898                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3899                 .rpc_message = &msg,
3900                 .callback_ops = &nfs4_locku_ops,
3901                 .workqueue = nfsiod_workqueue,
3902                 .flags = RPC_TASK_ASYNC,
3903         };
3904
3905         /* Ensure this is an unlock - when canceling a lock, the
3906          * canceled lock is passed in, and it won't be an unlock.
3907          */
3908         fl->fl_type = F_UNLCK;
3909
3910         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3911         if (data == NULL) {
3912                 nfs_free_seqid(seqid);
3913                 return ERR_PTR(-ENOMEM);
3914         }
3915
3916         msg.rpc_argp = &data->arg;
3917         msg.rpc_resp = &data->res;
3918         task_setup_data.callback_data = data;
3919         return rpc_run_task(&task_setup_data);
3920 }
3921
3922 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3923 {
3924         struct nfs_inode *nfsi = NFS_I(state->inode);
3925         struct nfs_seqid *seqid;
3926         struct nfs4_lock_state *lsp;
3927         struct rpc_task *task;
3928         int status = 0;
3929         unsigned char fl_flags = request->fl_flags;
3930
3931         status = nfs4_set_lock_state(state, request);
3932         /* Unlock _before_ we do the RPC call */
3933         request->fl_flags |= FL_EXISTS;
3934         down_read(&nfsi->rwsem);
3935         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3936                 up_read(&nfsi->rwsem);
3937                 goto out;
3938         }
3939         up_read(&nfsi->rwsem);
3940         if (status != 0)
3941                 goto out;
3942         /* Is this a delegated lock? */
3943         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3944                 goto out;
3945         lsp = request->fl_u.nfs4_fl.owner;
3946         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3947         status = -ENOMEM;
3948         if (seqid == NULL)
3949                 goto out;
3950         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3951         status = PTR_ERR(task);
3952         if (IS_ERR(task))
3953                 goto out;
3954         status = nfs4_wait_for_completion_rpc_task(task);
3955         rpc_put_task(task);
3956 out:
3957         request->fl_flags = fl_flags;
3958         return status;
3959 }
3960
3961 struct nfs4_lockdata {
3962         struct nfs_lock_args arg;
3963         struct nfs_lock_res res;
3964         struct nfs4_lock_state *lsp;
3965         struct nfs_open_context *ctx;
3966         struct file_lock fl;
3967         unsigned long timestamp;
3968         int rpc_status;
3969         int cancelled;
3970         struct nfs_server *server;
3971 };
3972
3973 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3974                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
3975                 gfp_t gfp_mask)
3976 {
3977         struct nfs4_lockdata *p;
3978         struct inode *inode = lsp->ls_state->inode;
3979         struct nfs_server *server = NFS_SERVER(inode);
3980
3981         p = kzalloc(sizeof(*p), gfp_mask);
3982         if (p == NULL)
3983                 return NULL;
3984
3985         p->arg.fh = NFS_FH(inode);
3986         p->arg.fl = &p->fl;
3987         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
3988         if (p->arg.open_seqid == NULL)
3989                 goto out_free;
3990         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
3991         if (p->arg.lock_seqid == NULL)
3992                 goto out_free_seqid;
3993         p->arg.lock_stateid = &lsp->ls_stateid;
3994         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3995         p->arg.lock_owner.id = lsp->ls_id.id;
3996         p->res.lock_seqid = p->arg.lock_seqid;
3997         p->lsp = lsp;
3998         p->server = server;
3999         atomic_inc(&lsp->ls_count);
4000         p->ctx = get_nfs_open_context(ctx);
4001         memcpy(&p->fl, fl, sizeof(p->fl));
4002         return p;
4003 out_free_seqid:
4004         nfs_free_seqid(p->arg.open_seqid);
4005 out_free:
4006         kfree(p);
4007         return NULL;
4008 }
4009
4010 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4011 {
4012         struct nfs4_lockdata *data = calldata;
4013         struct nfs4_state *state = data->lsp->ls_state;
4014
4015         dprintk("%s: begin!\n", __func__);
4016         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4017                 return;
4018         /* Do we need to do an open_to_lock_owner? */
4019         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4020                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4021                         return;
4022                 data->arg.open_stateid = &state->stateid;
4023                 data->arg.new_lock_owner = 1;
4024                 data->res.open_seqid = data->arg.open_seqid;
4025         } else
4026                 data->arg.new_lock_owner = 0;
4027         data->timestamp = jiffies;
4028         if (nfs4_setup_sequence(data->server,
4029                                 &data->arg.seq_args,
4030                                 &data->res.seq_res, 1, task))
4031                 return;
4032         rpc_call_start(task);
4033         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4034 }
4035
4036 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4037 {
4038         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4039         nfs4_lock_prepare(task, calldata);
4040 }
4041
4042 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4043 {
4044         struct nfs4_lockdata *data = calldata;
4045
4046         dprintk("%s: begin!\n", __func__);
4047
4048         if (!nfs4_sequence_done(task, &data->res.seq_res))
4049                 return;
4050
4051         data->rpc_status = task->tk_status;
4052         if (data->arg.new_lock_owner != 0) {
4053                 if (data->rpc_status == 0)
4054                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4055                 else
4056                         goto out;
4057         }
4058         if (data->rpc_status == 0) {
4059                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4060                                         sizeof(data->lsp->ls_stateid.data));
4061                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4062                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4063         }
4064 out:
4065         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4066 }
4067
4068 static void nfs4_lock_release(void *calldata)
4069 {
4070         struct nfs4_lockdata *data = calldata;
4071
4072         dprintk("%s: begin!\n", __func__);
4073         nfs_free_seqid(data->arg.open_seqid);
4074         if (data->cancelled != 0) {
4075                 struct rpc_task *task;
4076                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4077                                 data->arg.lock_seqid);
4078                 if (!IS_ERR(task))
4079                         rpc_put_task(task);
4080                 dprintk("%s: cancelling lock!\n", __func__);
4081         } else
4082                 nfs_free_seqid(data->arg.lock_seqid);
4083         nfs4_put_lock_state(data->lsp);
4084         put_nfs_open_context(data->ctx);
4085         kfree(data);
4086         dprintk("%s: done!\n", __func__);
4087 }
4088
4089 static const struct rpc_call_ops nfs4_lock_ops = {
4090         .rpc_call_prepare = nfs4_lock_prepare,
4091         .rpc_call_done = nfs4_lock_done,
4092         .rpc_release = nfs4_lock_release,
4093 };
4094
4095 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4096         .rpc_call_prepare = nfs4_recover_lock_prepare,
4097         .rpc_call_done = nfs4_lock_done,
4098         .rpc_release = nfs4_lock_release,
4099 };
4100
4101 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4102 {
4103         struct nfs_client *clp = server->nfs_client;
4104         struct nfs4_state *state = lsp->ls_state;
4105
4106         switch (error) {
4107         case -NFS4ERR_ADMIN_REVOKED:
4108         case -NFS4ERR_BAD_STATEID:
4109         case -NFS4ERR_EXPIRED:
4110                 if (new_lock_owner != 0 ||
4111                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4112                         nfs4_state_mark_reclaim_nograce(clp, state);
4113                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4114                 break;
4115         case -NFS4ERR_STALE_STATEID:
4116                 if (new_lock_owner != 0 ||
4117                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4118                         nfs4_state_mark_reclaim_reboot(clp, state);
4119                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4120         };
4121 }
4122
4123 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4124 {
4125         struct nfs4_lockdata *data;
4126         struct rpc_task *task;
4127         struct rpc_message msg = {
4128                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4129                 .rpc_cred = state->owner->so_cred,
4130         };
4131         struct rpc_task_setup task_setup_data = {
4132                 .rpc_client = NFS_CLIENT(state->inode),
4133                 .rpc_message = &msg,
4134                 .callback_ops = &nfs4_lock_ops,
4135                 .workqueue = nfsiod_workqueue,
4136                 .flags = RPC_TASK_ASYNC,
4137         };
4138         int ret;
4139
4140         dprintk("%s: begin!\n", __func__);
4141         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4142                         fl->fl_u.nfs4_fl.owner,
4143                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4144         if (data == NULL)
4145                 return -ENOMEM;
4146         if (IS_SETLKW(cmd))
4147                 data->arg.block = 1;
4148         if (recovery_type > NFS_LOCK_NEW) {
4149                 if (recovery_type == NFS_LOCK_RECLAIM)
4150                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4151                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4152         }
4153         msg.rpc_argp = &data->arg;
4154         msg.rpc_resp = &data->res;
4155         task_setup_data.callback_data = data;
4156         task = rpc_run_task(&task_setup_data);
4157         if (IS_ERR(task))
4158                 return PTR_ERR(task);
4159         ret = nfs4_wait_for_completion_rpc_task(task);
4160         if (ret == 0) {
4161                 ret = data->rpc_status;
4162                 if (ret)
4163                         nfs4_handle_setlk_error(data->server, data->lsp,
4164                                         data->arg.new_lock_owner, ret);
4165         } else
4166                 data->cancelled = 1;
4167         rpc_put_task(task);
4168         dprintk("%s: done, ret = %d!\n", __func__, ret);
4169         return ret;
4170 }
4171
4172 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4173 {
4174         struct nfs_server *server = NFS_SERVER(state->inode);
4175         struct nfs4_exception exception = { };
4176         int err;
4177
4178         do {
4179                 /* Cache the lock if possible... */
4180                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4181                         return 0;
4182                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4183                 if (err != -NFS4ERR_DELAY)
4184                         break;
4185                 nfs4_handle_exception(server, err, &exception);
4186         } while (exception.retry);
4187         return err;
4188 }
4189
4190 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4191 {
4192         struct nfs_server *server = NFS_SERVER(state->inode);
4193         struct nfs4_exception exception = { };
4194         int err;
4195
4196         err = nfs4_set_lock_state(state, request);
4197         if (err != 0)
4198                 return err;
4199         do {
4200                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4201                         return 0;
4202                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4203                 switch (err) {
4204                 default:
4205                         goto out;
4206                 case -NFS4ERR_GRACE:
4207                 case -NFS4ERR_DELAY:
4208                         nfs4_handle_exception(server, err, &exception);
4209                         err = 0;
4210                 }
4211         } while (exception.retry);
4212 out:
4213         return err;
4214 }
4215
4216 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4217 {
4218         struct nfs_inode *nfsi = NFS_I(state->inode);
4219         unsigned char fl_flags = request->fl_flags;
4220         int status = -ENOLCK;
4221
4222         if ((fl_flags & FL_POSIX) &&
4223                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4224                 goto out;
4225         /* Is this a delegated open? */
4226         status = nfs4_set_lock_state(state, request);
4227         if (status != 0)
4228                 goto out;
4229         request->fl_flags |= FL_ACCESS;
4230         status = do_vfs_lock(request->fl_file, request);
4231         if (status < 0)
4232                 goto out;
4233         down_read(&nfsi->rwsem);
4234         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4235                 /* Yes: cache locks! */
4236                 /* ...but avoid races with delegation recall... */
4237                 request->fl_flags = fl_flags & ~FL_SLEEP;
4238                 status = do_vfs_lock(request->fl_file, request);
4239                 goto out_unlock;
4240         }
4241         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4242         if (status != 0)
4243                 goto out_unlock;
4244         /* Note: we always want to sleep here! */
4245         request->fl_flags = fl_flags | FL_SLEEP;
4246         if (do_vfs_lock(request->fl_file, request) < 0)
4247                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4248 out_unlock:
4249         up_read(&nfsi->rwsem);
4250 out:
4251         request->fl_flags = fl_flags;
4252         return status;
4253 }
4254
4255 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4256 {
4257         struct nfs4_exception exception = { };
4258         int err;
4259
4260         do {
4261                 err = _nfs4_proc_setlk(state, cmd, request);
4262                 if (err == -NFS4ERR_DENIED)
4263                         err = -EAGAIN;
4264                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4265                                 err, &exception);
4266         } while (exception.retry);
4267         return err;
4268 }
4269
4270 static int
4271 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4272 {
4273         struct nfs_open_context *ctx;
4274         struct nfs4_state *state;
4275         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4276         int status;
4277
4278         /* verify open state */
4279         ctx = nfs_file_open_context(filp);
4280         state = ctx->state;
4281
4282         if (request->fl_start < 0 || request->fl_end < 0)
4283                 return -EINVAL;
4284
4285         if (IS_GETLK(cmd)) {
4286                 if (state != NULL)
4287                         return nfs4_proc_getlk(state, F_GETLK, request);
4288                 return 0;
4289         }
4290
4291         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4292                 return -EINVAL;
4293
4294         if (request->fl_type == F_UNLCK) {
4295                 if (state != NULL)
4296                         return nfs4_proc_unlck(state, cmd, request);
4297                 return 0;
4298         }
4299
4300         if (state == NULL)
4301                 return -ENOLCK;
4302         do {
4303                 status = nfs4_proc_setlk(state, cmd, request);
4304                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4305                         break;
4306                 timeout = nfs4_set_lock_task_retry(timeout);
4307                 status = -ERESTARTSYS;
4308                 if (signalled())
4309                         break;
4310         } while(status < 0);
4311         return status;
4312 }
4313
4314 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4315 {
4316         struct nfs_server *server = NFS_SERVER(state->inode);
4317         struct nfs4_exception exception = { };
4318         int err;
4319
4320         err = nfs4_set_lock_state(state, fl);
4321         if (err != 0)
4322                 goto out;
4323         do {
4324                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4325                 switch (err) {
4326                         default:
4327                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4328                                                 __func__, err);
4329                         case 0:
4330                         case -ESTALE:
4331                                 goto out;
4332                         case -NFS4ERR_EXPIRED:
4333                         case -NFS4ERR_STALE_CLIENTID:
4334                         case -NFS4ERR_STALE_STATEID:
4335                         case -NFS4ERR_BADSESSION:
4336                         case -NFS4ERR_BADSLOT:
4337                         case -NFS4ERR_BAD_HIGH_SLOT:
4338                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4339                         case -NFS4ERR_DEADSESSION:
4340                                 nfs4_schedule_state_recovery(server->nfs_client);
4341                                 goto out;
4342                         case -ERESTARTSYS:
4343                                 /*
4344                                  * The show must go on: exit, but mark the
4345                                  * stateid as needing recovery.
4346                                  */
4347                         case -NFS4ERR_ADMIN_REVOKED:
4348                         case -NFS4ERR_BAD_STATEID:
4349                         case -NFS4ERR_OPENMODE:
4350                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4351                                 err = 0;
4352                                 goto out;
4353                         case -EKEYEXPIRED:
4354                                 /*
4355                                  * User RPCSEC_GSS context has expired.
4356                                  * We cannot recover this stateid now, so
4357                                  * skip it and allow recovery thread to
4358                                  * proceed.
4359                                  */
4360                                 err = 0;
4361                                 goto out;
4362                         case -ENOMEM:
4363                         case -NFS4ERR_DENIED:
4364                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4365                                 err = 0;
4366                                 goto out;
4367                         case -NFS4ERR_DELAY:
4368                                 break;
4369                 }
4370                 err = nfs4_handle_exception(server, err, &exception);
4371         } while (exception.retry);
4372 out:
4373         return err;
4374 }
4375
4376 static void nfs4_release_lockowner_release(void *calldata)
4377 {
4378         kfree(calldata);
4379 }
4380
4381 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4382         .rpc_release = nfs4_release_lockowner_release,
4383 };
4384
4385 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4386 {
4387         struct nfs_server *server = lsp->ls_state->owner->so_server;
4388         struct nfs_release_lockowner_args *args;
4389         struct rpc_message msg = {
4390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4391         };
4392
4393         if (server->nfs_client->cl_mvops->minor_version != 0)
4394                 return;
4395         args = kmalloc(sizeof(*args), GFP_NOFS);
4396         if (!args)
4397                 return;
4398         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4399         args->lock_owner.id = lsp->ls_id.id;
4400         msg.rpc_argp = args;
4401         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4402 }
4403
4404 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4405
4406 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4407                 size_t buflen, int flags)
4408 {
4409         struct inode *inode = dentry->d_inode;
4410
4411         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4412                 return -EOPNOTSUPP;
4413
4414         return nfs4_proc_set_acl(inode, buf, buflen);
4415 }
4416
4417 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4418  * and that's what we'll do for e.g. user attributes that haven't been set.
4419  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4420  * attributes in kernel-managed attribute namespaces. */
4421 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4422                 size_t buflen)
4423 {
4424         struct inode *inode = dentry->d_inode;
4425
4426         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4427                 return -EOPNOTSUPP;
4428
4429         return nfs4_proc_get_acl(inode, buf, buflen);
4430 }
4431
4432 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4433 {
4434         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4435
4436         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4437                 return 0;
4438         if (buf && buflen < len)
4439                 return -ERANGE;
4440         if (buf)
4441                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4442         return len;
4443 }
4444
4445 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4446 {
4447         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4448                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4449                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4450                 return;
4451
4452         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4453                 NFS_ATTR_FATTR_NLINK;
4454         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4455         fattr->nlink = 2;
4456 }
4457
4458 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4459                 struct nfs4_fs_locations *fs_locations, struct page *page)
4460 {
4461         struct nfs_server *server = NFS_SERVER(dir);
4462         u32 bitmask[2] = {
4463                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4464                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4465         };
4466         struct nfs4_fs_locations_arg args = {
4467                 .dir_fh = NFS_FH(dir),
4468                 .name = name,
4469                 .page = page,
4470                 .bitmask = bitmask,
4471         };
4472         struct nfs4_fs_locations_res res = {
4473                 .fs_locations = fs_locations,
4474         };
4475         struct rpc_message msg = {
4476                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4477                 .rpc_argp = &args,
4478                 .rpc_resp = &res,
4479         };
4480         int status;
4481
4482         dprintk("%s: start\n", __func__);
4483         nfs_fattr_init(&fs_locations->fattr);
4484         fs_locations->server = server;
4485         fs_locations->nlocations = 0;
4486         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4487         nfs_fixup_referral_attributes(&fs_locations->fattr);
4488         dprintk("%s: returned status = %d\n", __func__, status);
4489         return status;
4490 }
4491
4492 #ifdef CONFIG_NFS_V4_1
4493 /*
4494  * nfs4_proc_exchange_id()
4495  *
4496  * Since the clientid has expired, all compounds using sessions
4497  * associated with the stale clientid will be returning
4498  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4499  * be in some phase of session reset.
4500  */
4501 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4502 {
4503         nfs4_verifier verifier;
4504         struct nfs41_exchange_id_args args = {
4505                 .client = clp,
4506                 .flags = clp->cl_exchange_flags,
4507         };
4508         struct nfs41_exchange_id_res res = {
4509                 .client = clp,
4510         };
4511         int status;
4512         struct rpc_message msg = {
4513                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4514                 .rpc_argp = &args,
4515                 .rpc_resp = &res,
4516                 .rpc_cred = cred,
4517         };
4518         __be32 *p;
4519
4520         dprintk("--> %s\n", __func__);
4521         BUG_ON(clp == NULL);
4522
4523         /* Remove server-only flags */
4524         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4525
4526         p = (u32 *)verifier.data;
4527         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4528         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4529         args.verifier = &verifier;
4530
4531         while (1) {
4532                 args.id_len = scnprintf(args.id, sizeof(args.id),
4533                                         "%s/%s %u",
4534                                         clp->cl_ipaddr,
4535                                         rpc_peeraddr2str(clp->cl_rpcclient,
4536                                                          RPC_DISPLAY_ADDR),
4537                                         clp->cl_id_uniquifier);
4538
4539                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4540
4541                 if (status != -NFS4ERR_CLID_INUSE)
4542                         break;
4543
4544                 if (signalled())
4545                         break;
4546
4547                 if (++clp->cl_id_uniquifier == 0)
4548                         break;
4549         }
4550
4551         dprintk("<-- %s status= %d\n", __func__, status);
4552         return status;
4553 }
4554
4555 struct nfs4_get_lease_time_data {
4556         struct nfs4_get_lease_time_args *args;
4557         struct nfs4_get_lease_time_res *res;
4558         struct nfs_client *clp;
4559 };
4560
4561 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4562                                         void *calldata)
4563 {
4564         int ret;
4565         struct nfs4_get_lease_time_data *data =
4566                         (struct nfs4_get_lease_time_data *)calldata;
4567
4568         dprintk("--> %s\n", __func__);
4569         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4570         /* just setup sequence, do not trigger session recovery
4571            since we're invoked within one */
4572         ret = nfs41_setup_sequence(data->clp->cl_session,
4573                                    &data->args->la_seq_args,
4574                                    &data->res->lr_seq_res, 0, task);
4575
4576         BUG_ON(ret == -EAGAIN);
4577         rpc_call_start(task);
4578         dprintk("<-- %s\n", __func__);
4579 }
4580
4581 /*
4582  * Called from nfs4_state_manager thread for session setup, so don't recover
4583  * from sequence operation or clientid errors.
4584  */
4585 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4586 {
4587         struct nfs4_get_lease_time_data *data =
4588                         (struct nfs4_get_lease_time_data *)calldata;
4589
4590         dprintk("--> %s\n", __func__);
4591         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4592                 return;
4593         switch (task->tk_status) {
4594         case -NFS4ERR_DELAY:
4595         case -NFS4ERR_GRACE:
4596                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4597                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4598                 task->tk_status = 0;
4599                 nfs_restart_rpc(task, data->clp);
4600                 return;
4601         }
4602         dprintk("<-- %s\n", __func__);
4603 }
4604
4605 struct rpc_call_ops nfs4_get_lease_time_ops = {
4606         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4607         .rpc_call_done = nfs4_get_lease_time_done,
4608 };
4609
4610 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4611 {
4612         struct rpc_task *task;
4613         struct nfs4_get_lease_time_args args;
4614         struct nfs4_get_lease_time_res res = {
4615                 .lr_fsinfo = fsinfo,
4616         };
4617         struct nfs4_get_lease_time_data data = {
4618                 .args = &args,
4619                 .res = &res,
4620                 .clp = clp,
4621         };
4622         struct rpc_message msg = {
4623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4624                 .rpc_argp = &args,
4625                 .rpc_resp = &res,
4626         };
4627         struct rpc_task_setup task_setup = {
4628                 .rpc_client = clp->cl_rpcclient,
4629                 .rpc_message = &msg,
4630                 .callback_ops = &nfs4_get_lease_time_ops,
4631                 .callback_data = &data
4632         };
4633         int status;
4634
4635         dprintk("--> %s\n", __func__);
4636         task = rpc_run_task(&task_setup);
4637
4638         if (IS_ERR(task))
4639                 status = PTR_ERR(task);
4640         else {
4641                 status = task->tk_status;
4642                 rpc_put_task(task);
4643         }
4644         dprintk("<-- %s return %d\n", __func__, status);
4645
4646         return status;
4647 }
4648
4649 /*
4650  * Reset a slot table
4651  */
4652 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4653                                  int ivalue)
4654 {
4655         struct nfs4_slot *new = NULL;
4656         int i;
4657         int ret = 0;
4658
4659         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4660                 max_reqs, tbl->max_slots);
4661
4662         /* Does the newly negotiated max_reqs match the existing slot table? */
4663         if (max_reqs != tbl->max_slots) {
4664                 ret = -ENOMEM;
4665                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4666                               GFP_NOFS);
4667                 if (!new)
4668                         goto out;
4669                 ret = 0;
4670                 kfree(tbl->slots);
4671         }
4672         spin_lock(&tbl->slot_tbl_lock);
4673         if (new) {
4674                 tbl->slots = new;
4675                 tbl->max_slots = max_reqs;
4676         }
4677         for (i = 0; i < tbl->max_slots; ++i)
4678                 tbl->slots[i].seq_nr = ivalue;
4679         spin_unlock(&tbl->slot_tbl_lock);
4680         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4681                 tbl, tbl->slots, tbl->max_slots);
4682 out:
4683         dprintk("<-- %s: return %d\n", __func__, ret);
4684         return ret;
4685 }
4686
4687 /*
4688  * Reset the forechannel and backchannel slot tables
4689  */
4690 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4691 {
4692         int status;
4693
4694         status = nfs4_reset_slot_table(&session->fc_slot_table,
4695                         session->fc_attrs.max_reqs, 1);
4696         if (status)
4697                 return status;
4698
4699         status = nfs4_reset_slot_table(&session->bc_slot_table,
4700                         session->bc_attrs.max_reqs, 0);
4701         return status;
4702 }
4703
4704 /* Destroy the slot table */
4705 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4706 {
4707         if (session->fc_slot_table.slots != NULL) {
4708                 kfree(session->fc_slot_table.slots);
4709                 session->fc_slot_table.slots = NULL;
4710         }
4711         if (session->bc_slot_table.slots != NULL) {
4712                 kfree(session->bc_slot_table.slots);
4713                 session->bc_slot_table.slots = NULL;
4714         }
4715         return;
4716 }
4717
4718 /*
4719  * Initialize slot table
4720  */
4721 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4722                 int max_slots, int ivalue)
4723 {
4724         struct nfs4_slot *slot;
4725         int ret = -ENOMEM;
4726
4727         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4728
4729         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4730
4731         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4732         if (!slot)
4733                 goto out;
4734         ret = 0;
4735
4736         spin_lock(&tbl->slot_tbl_lock);
4737         tbl->max_slots = max_slots;
4738         tbl->slots = slot;
4739         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4740         spin_unlock(&tbl->slot_tbl_lock);
4741         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4742                 tbl, tbl->slots, tbl->max_slots);
4743 out:
4744         dprintk("<-- %s: return %d\n", __func__, ret);
4745         return ret;
4746 }
4747
4748 /*
4749  * Initialize the forechannel and backchannel tables
4750  */
4751 static int nfs4_init_slot_tables(struct nfs4_session *session)
4752 {
4753         struct nfs4_slot_table *tbl;
4754         int status = 0;
4755
4756         tbl = &session->fc_slot_table;
4757         if (tbl->slots == NULL) {
4758                 status = nfs4_init_slot_table(tbl,
4759                                 session->fc_attrs.max_reqs, 1);
4760                 if (status)
4761                         return status;
4762         }
4763
4764         tbl = &session->bc_slot_table;
4765         if (tbl->slots == NULL) {
4766                 status = nfs4_init_slot_table(tbl,
4767                                 session->bc_attrs.max_reqs, 0);
4768                 if (status)
4769                         nfs4_destroy_slot_tables(session);
4770         }
4771
4772         return status;
4773 }
4774
4775 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4776 {
4777         struct nfs4_session *session;
4778         struct nfs4_slot_table *tbl;
4779
4780         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4781         if (!session)
4782                 return NULL;
4783
4784         init_completion(&session->complete);
4785
4786         tbl = &session->fc_slot_table;
4787         tbl->highest_used_slotid = -1;
4788         spin_lock_init(&tbl->slot_tbl_lock);
4789         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4790
4791         tbl = &session->bc_slot_table;
4792         tbl->highest_used_slotid = -1;
4793         spin_lock_init(&tbl->slot_tbl_lock);
4794         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4795
4796         session->session_state = 1<<NFS4_SESSION_INITING;
4797
4798         session->clp = clp;
4799         return session;
4800 }
4801
4802 void nfs4_destroy_session(struct nfs4_session *session)
4803 {
4804         nfs4_proc_destroy_session(session);
4805         dprintk("%s Destroy backchannel for xprt %p\n",
4806                 __func__, session->clp->cl_rpcclient->cl_xprt);
4807         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4808                                 NFS41_BC_MIN_CALLBACKS);
4809         nfs4_destroy_slot_tables(session);
4810         kfree(session);
4811 }
4812
4813 /*
4814  * Initialize the values to be used by the client in CREATE_SESSION
4815  * If nfs4_init_session set the fore channel request and response sizes,
4816  * use them.
4817  *
4818  * Set the back channel max_resp_sz_cached to zero to force the client to
4819  * always set csa_cachethis to FALSE because the current implementation
4820  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4821  */
4822 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4823 {
4824         struct nfs4_session *session = args->client->cl_session;
4825         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4826                      mxresp_sz = session->fc_attrs.max_resp_sz;
4827
4828         if (mxrqst_sz == 0)
4829                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4830         if (mxresp_sz == 0)
4831                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4832         /* Fore channel attributes */
4833         args->fc_attrs.headerpadsz = 0;
4834         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4835         args->fc_attrs.max_resp_sz = mxresp_sz;
4836         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4837         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4838
4839         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4840                 "max_ops=%u max_reqs=%u\n",
4841                 __func__,
4842                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4843                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4844
4845         /* Back channel attributes */
4846         args->bc_attrs.headerpadsz = 0;
4847         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4848         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4849         args->bc_attrs.max_resp_sz_cached = 0;
4850         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4851         args->bc_attrs.max_reqs = 1;
4852
4853         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4854                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4855                 __func__,
4856                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4857                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4858                 args->bc_attrs.max_reqs);
4859 }
4860
4861 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4862 {
4863         struct nfs4_channel_attrs *sent = &args->fc_attrs;
4864         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4865
4866         if (rcvd->headerpadsz > sent->headerpadsz)
4867                 return -EINVAL;
4868         if (rcvd->max_resp_sz > sent->max_resp_sz)
4869                 return -EINVAL;
4870         /*
4871          * Our requested max_ops is the minimum we need; we're not
4872          * prepared to break up compounds into smaller pieces than that.
4873          * So, no point even trying to continue if the server won't
4874          * cooperate:
4875          */
4876         if (rcvd->max_ops < sent->max_ops)
4877                 return -EINVAL;
4878         if (rcvd->max_reqs == 0)
4879                 return -EINVAL;
4880         return 0;
4881 }
4882
4883 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4884 {
4885         struct nfs4_channel_attrs *sent = &args->bc_attrs;
4886         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4887
4888         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4889                 return -EINVAL;
4890         if (rcvd->max_resp_sz < sent->max_resp_sz)
4891                 return -EINVAL;
4892         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4893                 return -EINVAL;
4894         /* These would render the backchannel useless: */
4895         if (rcvd->max_ops  == 0)
4896                 return -EINVAL;
4897         if (rcvd->max_reqs == 0)
4898                 return -EINVAL;
4899         return 0;
4900 }
4901
4902 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4903                                      struct nfs4_session *session)
4904 {
4905         int ret;
4906
4907         ret = nfs4_verify_fore_channel_attrs(args, session);
4908         if (ret)
4909                 return ret;
4910         return nfs4_verify_back_channel_attrs(args, session);
4911 }
4912
4913 static int _nfs4_proc_create_session(struct nfs_client *clp)
4914 {
4915         struct nfs4_session *session = clp->cl_session;
4916         struct nfs41_create_session_args args = {
4917                 .client = clp,
4918                 .cb_program = NFS4_CALLBACK,
4919         };
4920         struct nfs41_create_session_res res = {
4921                 .client = clp,
4922         };
4923         struct rpc_message msg = {
4924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4925                 .rpc_argp = &args,
4926                 .rpc_resp = &res,
4927         };
4928         int status;
4929
4930         nfs4_init_channel_attrs(&args);
4931         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4932
4933         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4934
4935         if (!status)
4936                 /* Verify the session's negotiated channel_attrs values */
4937                 status = nfs4_verify_channel_attrs(&args, session);
4938         if (!status) {
4939                 /* Increment the clientid slot sequence id */
4940                 clp->cl_seqid++;
4941         }
4942
4943         return status;
4944 }
4945
4946 /*
4947  * Issues a CREATE_SESSION operation to the server.
4948  * It is the responsibility of the caller to verify the session is
4949  * expired before calling this routine.
4950  */
4951 int nfs4_proc_create_session(struct nfs_client *clp)
4952 {
4953         int status;
4954         unsigned *ptr;
4955         struct nfs4_session *session = clp->cl_session;
4956
4957         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4958
4959         status = _nfs4_proc_create_session(clp);
4960         if (status)
4961                 goto out;
4962
4963         /* Init and reset the fore channel */
4964         status = nfs4_init_slot_tables(session);
4965         dprintk("slot table initialization returned %d\n", status);
4966         if (status)
4967                 goto out;
4968         status = nfs4_reset_slot_tables(session);
4969         dprintk("slot table reset returned %d\n", status);
4970         if (status)
4971                 goto out;
4972
4973         ptr = (unsigned *)&session->sess_id.data[0];
4974         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4975                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4976 out:
4977         dprintk("<-- %s\n", __func__);
4978         return status;
4979 }
4980
4981 /*
4982  * Issue the over-the-wire RPC DESTROY_SESSION.
4983  * The caller must serialize access to this routine.
4984  */
4985 int nfs4_proc_destroy_session(struct nfs4_session *session)
4986 {
4987         int status = 0;
4988         struct rpc_message msg;
4989
4990         dprintk("--> nfs4_proc_destroy_session\n");
4991
4992         /* session is still being setup */
4993         if (session->clp->cl_cons_state != NFS_CS_READY)
4994                 return status;
4995
4996         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4997         msg.rpc_argp = session;
4998         msg.rpc_resp = NULL;
4999         msg.rpc_cred = NULL;
5000         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5001
5002         if (status)
5003                 printk(KERN_WARNING
5004                         "Got error %d from the server on DESTROY_SESSION. "
5005                         "Session has been destroyed regardless...\n", status);
5006
5007         dprintk("<-- nfs4_proc_destroy_session\n");
5008         return status;
5009 }
5010
5011 int nfs4_init_session(struct nfs_server *server)
5012 {
5013         struct nfs_client *clp = server->nfs_client;
5014         struct nfs4_session *session;
5015         unsigned int rsize, wsize;
5016         int ret;
5017
5018         if (!nfs4_has_session(clp))
5019                 return 0;
5020
5021         session = clp->cl_session;
5022         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5023                 return 0;
5024
5025         rsize = server->rsize;
5026         if (rsize == 0)
5027                 rsize = NFS_MAX_FILE_IO_SIZE;
5028         wsize = server->wsize;
5029         if (wsize == 0)
5030                 wsize = NFS_MAX_FILE_IO_SIZE;
5031
5032         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5033         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5034
5035         ret = nfs4_recover_expired_lease(server);
5036         if (!ret)
5037                 ret = nfs4_check_client_ready(clp);
5038         return ret;
5039 }
5040
5041 /*
5042  * Renew the cl_session lease.
5043  */
5044 struct nfs4_sequence_data {
5045         struct nfs_client *clp;
5046         struct nfs4_sequence_args args;
5047         struct nfs4_sequence_res res;
5048 };
5049
5050 static void nfs41_sequence_release(void *data)
5051 {
5052         struct nfs4_sequence_data *calldata = data;
5053         struct nfs_client *clp = calldata->clp;
5054
5055         if (atomic_read(&clp->cl_count) > 1)
5056                 nfs4_schedule_state_renewal(clp);
5057         nfs_put_client(clp);
5058         kfree(calldata);
5059 }
5060
5061 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5062 {
5063         switch(task->tk_status) {
5064         case -NFS4ERR_DELAY:
5065                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5066                 return -EAGAIN;
5067         default:
5068                 nfs4_schedule_state_recovery(clp);
5069         }
5070         return 0;
5071 }
5072
5073 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5074 {
5075         struct nfs4_sequence_data *calldata = data;
5076         struct nfs_client *clp = calldata->clp;
5077
5078         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5079                 return;
5080
5081         if (task->tk_status < 0) {
5082                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5083                 if (atomic_read(&clp->cl_count) == 1)
5084                         goto out;
5085
5086                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5087                         rpc_restart_call_prepare(task);
5088                         return;
5089                 }
5090         }
5091         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5092 out:
5093         dprintk("<-- %s\n", __func__);
5094 }
5095
5096 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5097 {
5098         struct nfs4_sequence_data *calldata = data;
5099         struct nfs_client *clp = calldata->clp;
5100         struct nfs4_sequence_args *args;
5101         struct nfs4_sequence_res *res;
5102
5103         args = task->tk_msg.rpc_argp;
5104         res = task->tk_msg.rpc_resp;
5105
5106         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5107                 return;
5108         rpc_call_start(task);
5109 }
5110
5111 static const struct rpc_call_ops nfs41_sequence_ops = {
5112         .rpc_call_done = nfs41_sequence_call_done,
5113         .rpc_call_prepare = nfs41_sequence_prepare,
5114         .rpc_release = nfs41_sequence_release,
5115 };
5116
5117 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5118 {
5119         struct nfs4_sequence_data *calldata;
5120         struct rpc_message msg = {
5121                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5122                 .rpc_cred = cred,
5123         };
5124         struct rpc_task_setup task_setup_data = {
5125                 .rpc_client = clp->cl_rpcclient,
5126                 .rpc_message = &msg,
5127                 .callback_ops = &nfs41_sequence_ops,
5128                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5129         };
5130
5131         if (!atomic_inc_not_zero(&clp->cl_count))
5132                 return ERR_PTR(-EIO);
5133         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5134         if (calldata == NULL) {
5135                 nfs_put_client(clp);
5136                 return ERR_PTR(-ENOMEM);
5137         }
5138         msg.rpc_argp = &calldata->args;
5139         msg.rpc_resp = &calldata->res;
5140         calldata->clp = clp;
5141         task_setup_data.callback_data = calldata;
5142
5143         return rpc_run_task(&task_setup_data);
5144 }
5145
5146 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5147 {
5148         struct rpc_task *task;
5149         int ret = 0;
5150
5151         task = _nfs41_proc_sequence(clp, cred);
5152         if (IS_ERR(task))
5153                 ret = PTR_ERR(task);
5154         else
5155                 rpc_put_task(task);
5156         dprintk("<-- %s status=%d\n", __func__, ret);
5157         return ret;
5158 }
5159
5160 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5161 {
5162         struct rpc_task *task;
5163         int ret;
5164
5165         task = _nfs41_proc_sequence(clp, cred);
5166         if (IS_ERR(task)) {
5167                 ret = PTR_ERR(task);
5168                 goto out;
5169         }
5170         ret = rpc_wait_for_completion_task(task);
5171         if (!ret)
5172                 ret = task->tk_status;
5173         rpc_put_task(task);
5174 out:
5175         dprintk("<-- %s status=%d\n", __func__, ret);
5176         return ret;
5177 }
5178
5179 struct nfs4_reclaim_complete_data {
5180         struct nfs_client *clp;
5181         struct nfs41_reclaim_complete_args arg;
5182         struct nfs41_reclaim_complete_res res;
5183 };
5184
5185 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5186 {
5187         struct nfs4_reclaim_complete_data *calldata = data;
5188
5189         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5190         if (nfs41_setup_sequence(calldata->clp->cl_session,
5191                                 &calldata->arg.seq_args,
5192                                 &calldata->res.seq_res, 0, task))
5193                 return;
5194
5195         rpc_call_start(task);
5196 }
5197
5198 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5199 {
5200         switch(task->tk_status) {
5201         case 0:
5202         case -NFS4ERR_COMPLETE_ALREADY:
5203         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5204                 break;
5205         case -NFS4ERR_DELAY:
5206                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5207                 return -EAGAIN;
5208         default:
5209                 nfs4_schedule_state_recovery(clp);
5210         }
5211         return 0;
5212 }
5213
5214 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5215 {
5216         struct nfs4_reclaim_complete_data *calldata = data;
5217         struct nfs_client *clp = calldata->clp;
5218         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5219
5220         dprintk("--> %s\n", __func__);
5221         if (!nfs41_sequence_done(task, res))
5222                 return;
5223
5224         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5225                 rpc_restart_call_prepare(task);
5226                 return;
5227         }
5228         dprintk("<-- %s\n", __func__);
5229 }
5230
5231 static void nfs4_free_reclaim_complete_data(void *data)
5232 {
5233         struct nfs4_reclaim_complete_data *calldata = data;
5234
5235         kfree(calldata);
5236 }
5237
5238 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5239         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5240         .rpc_call_done = nfs4_reclaim_complete_done,
5241         .rpc_release = nfs4_free_reclaim_complete_data,
5242 };
5243
5244 /*
5245  * Issue a global reclaim complete.
5246  */
5247 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5248 {
5249         struct nfs4_reclaim_complete_data *calldata;
5250         struct rpc_task *task;
5251         struct rpc_message msg = {
5252                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5253         };
5254         struct rpc_task_setup task_setup_data = {
5255                 .rpc_client = clp->cl_rpcclient,
5256                 .rpc_message = &msg,
5257                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5258                 .flags = RPC_TASK_ASYNC,
5259         };
5260         int status = -ENOMEM;
5261
5262         dprintk("--> %s\n", __func__);
5263         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5264         if (calldata == NULL)
5265                 goto out;
5266         calldata->clp = clp;
5267         calldata->arg.one_fs = 0;
5268
5269         msg.rpc_argp = &calldata->arg;
5270         msg.rpc_resp = &calldata->res;
5271         task_setup_data.callback_data = calldata;
5272         task = rpc_run_task(&task_setup_data);
5273         if (IS_ERR(task)) {
5274                 status = PTR_ERR(task);
5275                 goto out;
5276         }
5277         rpc_put_task(task);
5278         return 0;
5279 out:
5280         dprintk("<-- %s status=%d\n", __func__, status);
5281         return status;
5282 }
5283
5284 static void
5285 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5286 {
5287         struct nfs4_layoutget *lgp = calldata;
5288         struct inode *ino = lgp->args.inode;
5289         struct nfs_server *server = NFS_SERVER(ino);
5290
5291         dprintk("--> %s\n", __func__);
5292         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5293                                 &lgp->res.seq_res, 0, task))
5294                 return;
5295         rpc_call_start(task);
5296 }
5297
5298 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5299 {
5300         struct nfs4_layoutget *lgp = calldata;
5301         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5302
5303         dprintk("--> %s\n", __func__);
5304
5305         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5306                 return;
5307
5308         switch (task->tk_status) {
5309         case 0:
5310                 break;
5311         case -NFS4ERR_LAYOUTTRYLATER:
5312         case -NFS4ERR_RECALLCONFLICT:
5313                 task->tk_status = -NFS4ERR_DELAY;
5314                 /* Fall through */
5315         default:
5316                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5317                         rpc_restart_call_prepare(task);
5318                         return;
5319                 }
5320         }
5321         lgp->status = task->tk_status;
5322         dprintk("<-- %s\n", __func__);
5323 }
5324
5325 static void nfs4_layoutget_release(void *calldata)
5326 {
5327         struct nfs4_layoutget *lgp = calldata;
5328
5329         dprintk("--> %s\n", __func__);
5330         put_layout_hdr(lgp->args.inode);
5331         if (lgp->res.layout.buf != NULL)
5332                 free_page((unsigned long) lgp->res.layout.buf);
5333         put_nfs_open_context(lgp->args.ctx);
5334         kfree(calldata);
5335         dprintk("<-- %s\n", __func__);
5336 }
5337
5338 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5339         .rpc_call_prepare = nfs4_layoutget_prepare,
5340         .rpc_call_done = nfs4_layoutget_done,
5341         .rpc_release = nfs4_layoutget_release,
5342 };
5343
5344 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5345 {
5346         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5347         struct rpc_task *task;
5348         struct rpc_message msg = {
5349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5350                 .rpc_argp = &lgp->args,
5351                 .rpc_resp = &lgp->res,
5352         };
5353         struct rpc_task_setup task_setup_data = {
5354                 .rpc_client = server->client,
5355                 .rpc_message = &msg,
5356                 .callback_ops = &nfs4_layoutget_call_ops,
5357                 .callback_data = lgp,
5358                 .flags = RPC_TASK_ASYNC,
5359         };
5360         int status = 0;
5361
5362         dprintk("--> %s\n", __func__);
5363
5364         lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5365         if (lgp->res.layout.buf == NULL) {
5366                 nfs4_layoutget_release(lgp);
5367                 return -ENOMEM;
5368         }
5369
5370         lgp->res.seq_res.sr_slot = NULL;
5371         task = rpc_run_task(&task_setup_data);
5372         if (IS_ERR(task))
5373                 return PTR_ERR(task);
5374         status = nfs4_wait_for_completion_rpc_task(task);
5375         if (status != 0)
5376                 goto out;
5377         status = lgp->status;
5378         if (status != 0)
5379                 goto out;
5380         status = pnfs_layout_process(lgp);
5381 out:
5382         rpc_put_task(task);
5383         dprintk("<-- %s status=%d\n", __func__, status);
5384         return status;
5385 }
5386
5387 static int
5388 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5389 {
5390         struct nfs4_getdeviceinfo_args args = {
5391                 .pdev = pdev,
5392         };
5393         struct nfs4_getdeviceinfo_res res = {
5394                 .pdev = pdev,
5395         };
5396         struct rpc_message msg = {
5397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5398                 .rpc_argp = &args,
5399                 .rpc_resp = &res,
5400         };
5401         int status;
5402
5403         dprintk("--> %s\n", __func__);
5404         status = nfs4_call_sync(server, &msg, &args, &res, 0);
5405         dprintk("<-- %s status=%d\n", __func__, status);
5406
5407         return status;
5408 }
5409
5410 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5411 {
5412         struct nfs4_exception exception = { };
5413         int err;
5414
5415         do {
5416                 err = nfs4_handle_exception(server,
5417                                         _nfs4_proc_getdeviceinfo(server, pdev),
5418                                         &exception);
5419         } while (exception.retry);
5420         return err;
5421 }
5422 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5423
5424 #endif /* CONFIG_NFS_V4_1 */
5425
5426 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5427         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5428         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5429         .recover_open   = nfs4_open_reclaim,
5430         .recover_lock   = nfs4_lock_reclaim,
5431         .establish_clid = nfs4_init_clientid,
5432         .get_clid_cred  = nfs4_get_setclientid_cred,
5433 };
5434
5435 #if defined(CONFIG_NFS_V4_1)
5436 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5437         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5438         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5439         .recover_open   = nfs4_open_reclaim,
5440         .recover_lock   = nfs4_lock_reclaim,
5441         .establish_clid = nfs41_init_clientid,
5442         .get_clid_cred  = nfs4_get_exchange_id_cred,
5443         .reclaim_complete = nfs41_proc_reclaim_complete,
5444 };
5445 #endif /* CONFIG_NFS_V4_1 */
5446
5447 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5448         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5449         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5450         .recover_open   = nfs4_open_expired,
5451         .recover_lock   = nfs4_lock_expired,
5452         .establish_clid = nfs4_init_clientid,
5453         .get_clid_cred  = nfs4_get_setclientid_cred,
5454 };
5455
5456 #if defined(CONFIG_NFS_V4_1)
5457 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5458         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5459         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5460         .recover_open   = nfs4_open_expired,
5461         .recover_lock   = nfs4_lock_expired,
5462         .establish_clid = nfs41_init_clientid,
5463         .get_clid_cred  = nfs4_get_exchange_id_cred,
5464 };
5465 #endif /* CONFIG_NFS_V4_1 */
5466
5467 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5468         .sched_state_renewal = nfs4_proc_async_renew,
5469         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5470         .renew_lease = nfs4_proc_renew,
5471 };
5472
5473 #if defined(CONFIG_NFS_V4_1)
5474 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5475         .sched_state_renewal = nfs41_proc_async_sequence,
5476         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5477         .renew_lease = nfs4_proc_sequence,
5478 };
5479 #endif
5480
5481 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5482         .minor_version = 0,
5483         .call_sync = _nfs4_call_sync,
5484         .validate_stateid = nfs4_validate_delegation_stateid,
5485         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5486         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5487         .state_renewal_ops = &nfs40_state_renewal_ops,
5488 };
5489
5490 #if defined(CONFIG_NFS_V4_1)
5491 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5492         .minor_version = 1,
5493         .call_sync = _nfs4_call_sync_session,
5494         .validate_stateid = nfs41_validate_delegation_stateid,
5495         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5496         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5497         .state_renewal_ops = &nfs41_state_renewal_ops,
5498 };
5499 #endif
5500
5501 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5502         [0] = &nfs_v4_0_minor_ops,
5503 #if defined(CONFIG_NFS_V4_1)
5504         [1] = &nfs_v4_1_minor_ops,
5505 #endif
5506 };
5507
5508 static const struct inode_operations nfs4_file_inode_operations = {
5509         .permission     = nfs_permission,
5510         .getattr        = nfs_getattr,
5511         .setattr        = nfs_setattr,
5512         .getxattr       = nfs4_getxattr,
5513         .setxattr       = nfs4_setxattr,
5514         .listxattr      = nfs4_listxattr,
5515 };
5516
5517 const struct nfs_rpc_ops nfs_v4_clientops = {
5518         .version        = 4,                    /* protocol version */
5519         .dentry_ops     = &nfs4_dentry_operations,
5520         .dir_inode_ops  = &nfs4_dir_inode_operations,
5521         .file_inode_ops = &nfs4_file_inode_operations,
5522         .getroot        = nfs4_proc_get_root,
5523         .getattr        = nfs4_proc_getattr,
5524         .setattr        = nfs4_proc_setattr,
5525         .lookupfh       = nfs4_proc_lookupfh,
5526         .lookup         = nfs4_proc_lookup,
5527         .access         = nfs4_proc_access,
5528         .readlink       = nfs4_proc_readlink,
5529         .create         = nfs4_proc_create,
5530         .remove         = nfs4_proc_remove,
5531         .unlink_setup   = nfs4_proc_unlink_setup,
5532         .unlink_done    = nfs4_proc_unlink_done,
5533         .rename         = nfs4_proc_rename,
5534         .rename_setup   = nfs4_proc_rename_setup,
5535         .rename_done    = nfs4_proc_rename_done,
5536         .link           = nfs4_proc_link,
5537         .symlink        = nfs4_proc_symlink,
5538         .mkdir          = nfs4_proc_mkdir,
5539         .rmdir          = nfs4_proc_remove,
5540         .readdir        = nfs4_proc_readdir,
5541         .mknod          = nfs4_proc_mknod,
5542         .statfs         = nfs4_proc_statfs,
5543         .fsinfo         = nfs4_proc_fsinfo,
5544         .pathconf       = nfs4_proc_pathconf,
5545         .set_capabilities = nfs4_server_capabilities,
5546         .decode_dirent  = nfs4_decode_dirent,
5547         .read_setup     = nfs4_proc_read_setup,
5548         .read_done      = nfs4_read_done,
5549         .write_setup    = nfs4_proc_write_setup,
5550         .write_done     = nfs4_write_done,
5551         .commit_setup   = nfs4_proc_commit_setup,
5552         .commit_done    = nfs4_commit_done,
5553         .lock           = nfs4_proc_lock,
5554         .clear_acl_cache = nfs4_zap_acl_attr,
5555         .close_context  = nfs4_close_context,
5556         .open_context   = nfs4_atomic_open,
5557 };
5558
5559 /*
5560  * Local variables:
5561  *  c-basic-offset: 8
5562  * End:
5563  */