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 #include <linux/xattr.h>
  53
  54 #include "nfs4_fs.h"
  55 #include "delegation.h"
  56 #include "internal.h"
  57 #include "iostat.h"
  58 #include "callback.h"
  59 #include "pnfs.h"
  60
  61 #define NFSDBG_FACILITY         NFSDBG_PROC
  62
  63 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  64 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  65
  66 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  67
  68 struct nfs4_opendata;
  69 static int _nfs4_proc_open(struct nfs4_opendata *data);
  70 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  71 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  72 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  73 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  74 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  75 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  76                             struct nfs_fattr *fattr, struct iattr *sattr,
  77                             struct nfs4_state *state);
  78
  79 /* Prevent leaks of NFSv4 errors into userland */
  80 static int nfs4_map_errors(int err)
  81 {
  82         if (err >= -1000)
  83                 return err;
  84         switch (err) {
  85         case -NFS4ERR_RESOURCE:
  86                 return -EREMOTEIO;
  87         default:
  88                 dprintk("%s could not handle NFSv4 error %d\n",
  89                                 __func__, -err);
  90                 break;
  91         }
  92         return -EIO;
  93 }
  94
  95 /*
  96  * This is our standard bitmap for GETATTR requests.
  97  */
  98 const u32 nfs4_fattr_bitmap[2] = {
  99         FATTR4_WORD0_TYPE
 100         | FATTR4_WORD0_CHANGE
 101         | FATTR4_WORD0_SIZE
 102         | FATTR4_WORD0_FSID
 103         | FATTR4_WORD0_FILEID,
 104         FATTR4_WORD1_MODE
 105         | FATTR4_WORD1_NUMLINKS
 106         | FATTR4_WORD1_OWNER
 107         | FATTR4_WORD1_OWNER_GROUP
 108         | FATTR4_WORD1_RAWDEV
 109         | FATTR4_WORD1_SPACE_USED
 110         | FATTR4_WORD1_TIME_ACCESS
 111         | FATTR4_WORD1_TIME_METADATA
 112         | FATTR4_WORD1_TIME_MODIFY
 113 };
 114
 115 const u32 nfs4_statfs_bitmap[2] = {
 116         FATTR4_WORD0_FILES_AVAIL
 117         | FATTR4_WORD0_FILES_FREE
 118         | FATTR4_WORD0_FILES_TOTAL,
 119         FATTR4_WORD1_SPACE_AVAIL
 120         | FATTR4_WORD1_SPACE_FREE
 121         | FATTR4_WORD1_SPACE_TOTAL
 122 };
 123
 124 const u32 nfs4_pathconf_bitmap[2] = {
 125         FATTR4_WORD0_MAXLINK
 126         | FATTR4_WORD0_MAXNAME,
 127         0
 128 };
 129
 130 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 131                         | FATTR4_WORD0_MAXREAD
 132                         | FATTR4_WORD0_MAXWRITE
 133                         | FATTR4_WORD0_LEASE_TIME,
 134                         FATTR4_WORD1_TIME_DELTA
 135                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 136 };
 137
 138 const u32 nfs4_fs_locations_bitmap[2] = {
 139         FATTR4_WORD0_TYPE
 140         | FATTR4_WORD0_CHANGE
 141         | FATTR4_WORD0_SIZE
 142         | FATTR4_WORD0_FSID
 143         | FATTR4_WORD0_FILEID
 144         | FATTR4_WORD0_FS_LOCATIONS,
 145         FATTR4_WORD1_MODE
 146         | FATTR4_WORD1_NUMLINKS
 147         | FATTR4_WORD1_OWNER
 148         | FATTR4_WORD1_OWNER_GROUP
 149         | FATTR4_WORD1_RAWDEV
 150         | FATTR4_WORD1_SPACE_USED
 151         | FATTR4_WORD1_TIME_ACCESS
 152         | FATTR4_WORD1_TIME_METADATA
 153         | FATTR4_WORD1_TIME_MODIFY
 154         | FATTR4_WORD1_MOUNTED_ON_FILEID
 155 };
 156
 157 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 158                 struct nfs4_readdir_arg *readdir)
 159 {
 160         __be32 *start, *p;
 161
 162         BUG_ON(readdir->count < 80);
 163         if (cookie > 2) {
 164                 readdir->cookie = cookie;
 165                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 166                 return;
 167         }
 168
 169         readdir->cookie = 0;
 170         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 171         if (cookie == 2)
 172                 return;
 173
 174         /*
 175          * NFSv4 servers do not return entries for '.' and '..'
 176          * Therefore, we fake these entries here.  We let '.'
 177          * have cookie 0 and '..' have cookie 1.  Note that
 178          * when talking to the server, we always send cookie 0
 179          * instead of 1 or 2.
 180          */
 181         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 182
 183         if (cookie == 0) {
 184                 *p++ = xdr_one;                                  /* next */
 185                 *p++ = xdr_zero;                   /* cookie, first word */
 186                 *p++ = xdr_one;                   /* cookie, second word */
 187                 *p++ = xdr_one;                             /* entry len */
 188                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 189                 p++;
 190                 *p++ = xdr_one;                         /* bitmap length */
 191                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 192                 *p++ = htonl(8);              /* attribute buffer length */
 193                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 194         }
 195
 196         *p++ = xdr_one;                                  /* next */
 197         *p++ = xdr_zero;                   /* cookie, first word */
 198         *p++ = xdr_two;                   /* cookie, second word */
 199         *p++ = xdr_two;                             /* entry len */
 200         memcpy(p, "..\0\0", 4);                         /* entry */
 201         p++;
 202         *p++ = xdr_one;                         /* bitmap length */
 203         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 204         *p++ = htonl(8);              /* attribute buffer length */
 205         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 206
 207         readdir->pgbase = (char *)p - (char *)start;
 208         readdir->count -= readdir->pgbase;
 209         kunmap_atomic(start, KM_USER0);
 210 }
 211
 212 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 213 {
 214         int res;
 215
 216         might_sleep();
 217
 218         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 219                         nfs_wait_bit_killable, TASK_KILLABLE);
 220         return res;
 221 }
 222
 223 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 224 {
 225         int res = 0;
 226
 227         might_sleep();
 228
 229         if (*timeout <= 0)
 230                 *timeout = NFS4_POLL_RETRY_MIN;
 231         if (*timeout > NFS4_POLL_RETRY_MAX)
 232                 *timeout = NFS4_POLL_RETRY_MAX;
 233         schedule_timeout_killable(*timeout);
 234         if (fatal_signal_pending(current))
 235                 res = -ERESTARTSYS;
 236         *timeout <<= 1;
 237         return res;
 238 }
 239
 240 /* This is the error handling routine for processes that are allowed
 241  * to sleep.
 242  */
 243 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 244 {
 245         struct nfs_client *clp = server->nfs_client;
 246         struct nfs4_state *state = exception->state;
 247         int ret = errorcode;
 248
 249         exception->retry = 0;
 250         switch(errorcode) {
 251                 case 0:
 252                         return 0;
 253                 case -NFS4ERR_ADMIN_REVOKED:
 254                 case -NFS4ERR_BAD_STATEID:
 255                 case -NFS4ERR_OPENMODE:
 256                         if (state == NULL)
 257                                 break;
 258                         nfs4_state_mark_reclaim_nograce(clp, state);
 259                         goto do_state_recovery;
 260                 case -NFS4ERR_STALE_STATEID:
 261                 case -NFS4ERR_STALE_CLIENTID:
 262                 case -NFS4ERR_EXPIRED:
 263                         goto do_state_recovery;
 264 #if defined(CONFIG_NFS_V4_1)
 265                 case -NFS4ERR_BADSESSION:
 266                 case -NFS4ERR_BADSLOT:
 267                 case -NFS4ERR_BAD_HIGH_SLOT:
 268                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 269                 case -NFS4ERR_DEADSESSION:
 270                 case -NFS4ERR_SEQ_FALSE_RETRY:
 271                 case -NFS4ERR_SEQ_MISORDERED:
 272                         dprintk("%s ERROR: %d Reset session\n", __func__,
 273                                 errorcode);
 274                         nfs4_schedule_state_recovery(clp);
 275                         exception->retry = 1;
 276                         break;
 277 #endif /* defined(CONFIG_NFS_V4_1) */
 278                 case -NFS4ERR_FILE_OPEN:
 279                         if (exception->timeout > HZ) {
 280                                 /* We have retried a decent amount, time to
 281                                  * fail
 282                                  */
 283                                 ret = -EBUSY;
 284                                 break;
 285                         }
 286                 case -NFS4ERR_GRACE:
 287                 case -NFS4ERR_DELAY:
 288                 case -EKEYEXPIRED:
 289                         ret = nfs4_delay(server->client, &exception->timeout);
 290                         if (ret != 0)
 291                                 break;
 292                 case -NFS4ERR_OLD_STATEID:
 293                         exception->retry = 1;
 294         }
 295         /* We failed to handle the error */
 296         return nfs4_map_errors(ret);
 297 do_state_recovery:
 298         nfs4_schedule_state_recovery(clp);
 299         ret = nfs4_wait_clnt_recover(clp);
 300         if (ret == 0)
 301                 exception->retry = 1;
 302         return ret;
 303 }
 304
 305
 306 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 307 {
 308         spin_lock(&clp->cl_lock);
 309         if (time_before(clp->cl_last_renewal,timestamp))
 310                 clp->cl_last_renewal = timestamp;
 311         spin_unlock(&clp->cl_lock);
 312 }
 313
 314 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 315 {
 316         do_renew_lease(server->nfs_client, timestamp);
 317 }
 318
 319 #if defined(CONFIG_NFS_V4_1)
 320
 321 /*
 322  * nfs4_free_slot - free a slot and efficiently update slot table.
 323  *
 324  * freeing a slot is trivially done by clearing its respective bit
 325  * in the bitmap.
 326  * If the freed slotid equals highest_used_slotid we want to update it
 327  * so that the server would be able to size down the slot table if needed,
 328  * otherwise we know that the highest_used_slotid is still in use.
 329  * When updating highest_used_slotid there may be "holes" in the bitmap
 330  * so we need to scan down from highest_used_slotid to 0 looking for the now
 331  * highest slotid in use.
 332  * If none found, highest_used_slotid is set to -1.
 333  *
 334  * Must be called while holding tbl->slot_tbl_lock
 335  */
 336 static void
 337 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 338 {
 339         int free_slotid = free_slot - tbl->slots;
 340         int slotid = free_slotid;
 341
 342         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 343         /* clear used bit in bitmap */
 344         __clear_bit(slotid, tbl->used_slots);
 345
 346         /* update highest_used_slotid when it is freed */
 347         if (slotid == tbl->highest_used_slotid) {
 348                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 349                 if (slotid < tbl->max_slots)
 350                         tbl->highest_used_slotid = slotid;
 351                 else
 352                         tbl->highest_used_slotid = -1;
 353         }
 354         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 355                 free_slotid, tbl->highest_used_slotid);
 356 }
 357
 358 /*
 359  * Signal state manager thread if session is drained
 360  */
 361 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 362 {
 363         struct rpc_task *task;
 364
 365         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 366                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 367                 if (task)
 368                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 369                 return;
 370         }
 371
 372         if (ses->fc_slot_table.highest_used_slotid != -1)
 373                 return;
 374
 375         dprintk("%s COMPLETE: Session Drained\n", __func__);
 376         complete(&ses->complete);
 377 }
 378
 379 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 380 {
 381         struct nfs4_slot_table *tbl;
 382
 383         tbl = &res->sr_session->fc_slot_table;
 384         if (!res->sr_slot) {
 385                 /* just wake up the next guy waiting since
 386                  * we may have not consumed a slot after all */
 387                 dprintk("%s: No slot\n", __func__);
 388                 return;
 389         }
 390
 391         spin_lock(&tbl->slot_tbl_lock);
 392         nfs4_free_slot(tbl, res->sr_slot);
 393         nfs41_check_drain_session_complete(res->sr_session);
 394         spin_unlock(&tbl->slot_tbl_lock);
 395         res->sr_slot = NULL;
 396 }
 397
 398 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 399 {
 400         unsigned long timestamp;
 401         struct nfs_client *clp;
 402
 403         /*
 404          * sr_status remains 1 if an RPC level error occurred. The server
 405          * may or may not have processed the sequence operation..
 406          * Proceed as if the server received and processed the sequence
 407          * operation.
 408          */
 409         if (res->sr_status == 1)
 410                 res->sr_status = NFS_OK;
 411
 412         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 413         if (!res->sr_slot)
 414                 goto out;
 415
 416         /* Check the SEQUENCE operation status */
 417         switch (res->sr_status) {
 418         case 0:
 419                 /* Update the slot's sequence and clientid lease timer */
 420                 ++res->sr_slot->seq_nr;
 421                 timestamp = res->sr_renewal_time;
 422                 clp = res->sr_session->clp;
 423                 do_renew_lease(clp, timestamp);
 424                 /* Check sequence flags */
 425                 if (atomic_read(&clp->cl_count) > 1)
 426                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 427                 break;
 428         case -NFS4ERR_DELAY:
 429                 /* The server detected a resend of the RPC call and
 430                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 431                  * of RFC5661.
 432                  */
 433                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 434                         __func__,
 435                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 436                         res->sr_slot->seq_nr);
 437                 goto out_retry;
 438         default:
 439                 /* Just update the slot sequence no. */
 440                 ++res->sr_slot->seq_nr;
 441         }
 442 out:
 443         /* The session may be reset by one of the error handlers. */
 444         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 445         nfs41_sequence_free_slot(res);
 446         return 1;
 447 out_retry:
 448         if (!rpc_restart_call(task))
 449                 goto out;
 450         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 451         return 0;
 452 }
 453
 454 static int nfs4_sequence_done(struct rpc_task *task,
 455                                struct nfs4_sequence_res *res)
 456 {
 457         if (res->sr_session == NULL)
 458                 return 1;
 459         return nfs41_sequence_done(task, res);
 460 }
 461
 462 /*
 463  * nfs4_find_slot - efficiently look for a free slot
 464  *
 465  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 466  * If found, we mark the slot as used, update the highest_used_slotid,
 467  * and respectively set up the sequence operation args.
 468  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 469  *
 470  * Note: must be called with under the slot_tbl_lock.
 471  */
 472 static u8
 473 nfs4_find_slot(struct nfs4_slot_table *tbl)
 474 {
 475         int slotid;
 476         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 477         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 478
 479         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 480                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 481                 tbl->max_slots);
 482         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 483         if (slotid >= tbl->max_slots)
 484                 goto out;
 485         __set_bit(slotid, tbl->used_slots);
 486         if (slotid > tbl->highest_used_slotid)
 487                 tbl->highest_used_slotid = slotid;
 488         ret_id = slotid;
 489 out:
 490         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 491                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 492         return ret_id;
 493 }
 494
 495 static int nfs41_setup_sequence(struct nfs4_session *session,
 496                                 struct nfs4_sequence_args *args,
 497                                 struct nfs4_sequence_res *res,
 498                                 int cache_reply,
 499                                 struct rpc_task *task)
 500 {
 501         struct nfs4_slot *slot;
 502         struct nfs4_slot_table *tbl;
 503         u8 slotid;
 504
 505         dprintk("--> %s\n", __func__);
 506         /* slot already allocated? */
 507         if (res->sr_slot != NULL)
 508                 return 0;
 509
 510         tbl = &session->fc_slot_table;
 511
 512         spin_lock(&tbl->slot_tbl_lock);
 513         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 514             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 515                 /*
 516                  * The state manager will wait until the slot table is empty.
 517                  * Schedule the reset thread
 518                  */
 519                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 520                 spin_unlock(&tbl->slot_tbl_lock);
 521                 dprintk("%s Schedule Session Reset\n", __func__);
 522                 return -EAGAIN;
 523         }
 524
 525         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 526             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 527                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 528                 spin_unlock(&tbl->slot_tbl_lock);
 529                 dprintk("%s enforce FIFO order\n", __func__);
 530                 return -EAGAIN;
 531         }
 532
 533         slotid = nfs4_find_slot(tbl);
 534         if (slotid == NFS4_MAX_SLOT_TABLE) {
 535                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 536                 spin_unlock(&tbl->slot_tbl_lock);
 537                 dprintk("<-- %s: no free slots\n", __func__);
 538                 return -EAGAIN;
 539         }
 540         spin_unlock(&tbl->slot_tbl_lock);
 541
 542         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 543         slot = tbl->slots + slotid;
 544         args->sa_session = session;
 545         args->sa_slotid = slotid;
 546         args->sa_cache_this = cache_reply;
 547
 548         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 549
 550         res->sr_session = session;
 551         res->sr_slot = slot;
 552         res->sr_renewal_time = jiffies;
 553         res->sr_status_flags = 0;
 554         /*
 555          * sr_status is only set in decode_sequence, and so will remain
 556          * set to 1 if an rpc level failure occurs.
 557          */
 558         res->sr_status = 1;
 559         return 0;
 560 }
 561
 562 int nfs4_setup_sequence(const struct nfs_server *server,
 563                         struct nfs4_sequence_args *args,
 564                         struct nfs4_sequence_res *res,
 565                         int cache_reply,
 566                         struct rpc_task *task)
 567 {
 568         struct nfs4_session *session = nfs4_get_session(server);
 569         int ret = 0;
 570
 571         if (session == NULL) {
 572                 args->sa_session = NULL;
 573                 res->sr_session = NULL;
 574                 goto out;
 575         }
 576
 577         dprintk("--> %s clp %p session %p sr_slot %td\n",
 578                 __func__, session->clp, session, res->sr_slot ?
 579                         res->sr_slot - session->fc_slot_table.slots : -1);
 580
 581         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 582                                    task);
 583 out:
 584         dprintk("<-- %s status=%d\n", __func__, ret);
 585         return ret;
 586 }
 587
 588 struct nfs41_call_sync_data {
 589         const struct nfs_server *seq_server;
 590         struct nfs4_sequence_args *seq_args;
 591         struct nfs4_sequence_res *seq_res;
 592         int cache_reply;
 593 };
 594
 595 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 596 {
 597         struct nfs41_call_sync_data *data = calldata;
 598
 599         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 600
 601         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 602                                 data->seq_res, data->cache_reply, task))
 603                 return;
 604         rpc_call_start(task);
 605 }
 606
 607 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 608 {
 609         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 610         nfs41_call_sync_prepare(task, calldata);
 611 }
 612
 613 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 614 {
 615         struct nfs41_call_sync_data *data = calldata;
 616
 617         nfs41_sequence_done(task, data->seq_res);
 618 }
 619
 620 struct rpc_call_ops nfs41_call_sync_ops = {
 621         .rpc_call_prepare = nfs41_call_sync_prepare,
 622         .rpc_call_done = nfs41_call_sync_done,
 623 };
 624
 625 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 626         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 627         .rpc_call_done = nfs41_call_sync_done,
 628 };
 629
 630 static int nfs4_call_sync_sequence(struct nfs_server *server,
 631                                    struct rpc_message *msg,
 632                                    struct nfs4_sequence_args *args,
 633                                    struct nfs4_sequence_res *res,
 634                                    int cache_reply,
 635                                    int privileged)
 636 {
 637         int ret;
 638         struct rpc_task *task;
 639         struct nfs41_call_sync_data data = {
 640                 .seq_server = server,
 641                 .seq_args = args,
 642                 .seq_res = res,
 643                 .cache_reply = cache_reply,
 644         };
 645         struct rpc_task_setup task_setup = {
 646                 .rpc_client = server->client,
 647                 .rpc_message = msg,
 648                 .callback_ops = &nfs41_call_sync_ops,
 649                 .callback_data = &data
 650         };
 651
 652         res->sr_slot = NULL;
 653         if (privileged)
 654                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 655         task = rpc_run_task(&task_setup);
 656         if (IS_ERR(task))
 657                 ret = PTR_ERR(task);
 658         else {
 659                 ret = task->tk_status;
 660                 rpc_put_task(task);
 661         }
 662         return ret;
 663 }
 664
 665 int _nfs4_call_sync_session(struct nfs_server *server,
 666                             struct rpc_message *msg,
 667                             struct nfs4_sequence_args *args,
 668                             struct nfs4_sequence_res *res,
 669                             int cache_reply)
 670 {
 671         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 672 }
 673
 674 #else
 675 static int nfs4_sequence_done(struct rpc_task *task,
 676                                struct nfs4_sequence_res *res)
 677 {
 678         return 1;
 679 }
 680 #endif /* CONFIG_NFS_V4_1 */
 681
 682 int _nfs4_call_sync(struct nfs_server *server,
 683                     struct rpc_message *msg,
 684                     struct nfs4_sequence_args *args,
 685                     struct nfs4_sequence_res *res,
 686                     int cache_reply)
 687 {
 688         args->sa_session = res->sr_session = NULL;
 689         return rpc_call_sync(server->client, msg, 0);
 690 }
 691
 692 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 693         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 694                         &(res)->seq_res, (cache_reply))
 695
 696 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 697 {
 698         struct nfs_inode *nfsi = NFS_I(dir);
 699
 700         spin_lock(&dir->i_lock);
 701         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 702         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 703                 nfs_force_lookup_revalidate(dir);
 704         nfsi->change_attr = cinfo->after;
 705         spin_unlock(&dir->i_lock);
 706 }
 707
 708 struct nfs4_opendata {
 709         struct kref kref;
 710         struct nfs_openargs o_arg;
 711         struct nfs_openres o_res;
 712         struct nfs_open_confirmargs c_arg;
 713         struct nfs_open_confirmres c_res;
 714         struct nfs_fattr f_attr;
 715         struct nfs_fattr dir_attr;
 716         struct path path;
 717         struct dentry *dir;
 718         struct nfs4_state_owner *owner;
 719         struct nfs4_state *state;
 720         struct iattr attrs;
 721         unsigned long timestamp;
 722         unsigned int rpc_done : 1;
 723         int rpc_status;
 724         int cancelled;
 725 };
 726
 727
 728 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 729 {
 730         p->o_res.f_attr = &p->f_attr;
 731         p->o_res.dir_attr = &p->dir_attr;
 732         p->o_res.seqid = p->o_arg.seqid;
 733         p->c_res.seqid = p->c_arg.seqid;
 734         p->o_res.server = p->o_arg.server;
 735         nfs_fattr_init(&p->f_attr);
 736         nfs_fattr_init(&p->dir_attr);
 737 }
 738
 739 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 740                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 741                 const struct iattr *attrs,
 742                 gfp_t gfp_mask)
 743 {
 744         struct dentry *parent = dget_parent(path->dentry);
 745         struct inode *dir = parent->d_inode;
 746         struct nfs_server *server = NFS_SERVER(dir);
 747         struct nfs4_opendata *p;
 748
 749         p = kzalloc(sizeof(*p), gfp_mask);
 750         if (p == NULL)
 751                 goto err;
 752         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 753         if (p->o_arg.seqid == NULL)
 754                 goto err_free;
 755         path_get(path);
 756         p->path = *path;
 757         p->dir = parent;
 758         p->owner = sp;
 759         atomic_inc(&sp->so_count);
 760         p->o_arg.fh = NFS_FH(dir);
 761         p->o_arg.open_flags = flags;
 762         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 763         p->o_arg.clientid = server->nfs_client->cl_clientid;
 764         p->o_arg.id = sp->so_owner_id.id;
 765         p->o_arg.name = &p->path.dentry->d_name;
 766         p->o_arg.server = server;
 767         p->o_arg.bitmask = server->attr_bitmask;
 768         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 769         if (flags & O_CREAT) {
 770                 u32 *s;
 771
 772                 p->o_arg.u.attrs = &p->attrs;
 773                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 774                 s = (u32 *) p->o_arg.u.verifier.data;
 775                 s[0] = jiffies;
 776                 s[1] = current->pid;
 777         }
 778         p->c_arg.fh = &p->o_res.fh;
 779         p->c_arg.stateid = &p->o_res.stateid;
 780         p->c_arg.seqid = p->o_arg.seqid;
 781         nfs4_init_opendata_res(p);
 782         kref_init(&p->kref);
 783         return p;
 784 err_free:
 785         kfree(p);
 786 err:
 787         dput(parent);
 788         return NULL;
 789 }
 790
 791 static void nfs4_opendata_free(struct kref *kref)
 792 {
 793         struct nfs4_opendata *p = container_of(kref,
 794                         struct nfs4_opendata, kref);
 795
 796         nfs_free_seqid(p->o_arg.seqid);
 797         if (p->state != NULL)
 798                 nfs4_put_open_state(p->state);
 799         nfs4_put_state_owner(p->owner);
 800         dput(p->dir);
 801         path_put(&p->path);
 802         kfree(p);
 803 }
 804
 805 static void nfs4_opendata_put(struct nfs4_opendata *p)
 806 {
 807         if (p != NULL)
 808                 kref_put(&p->kref, nfs4_opendata_free);
 809 }
 810
 811 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 812 {
 813         int ret;
 814
 815         ret = rpc_wait_for_completion_task(task);
 816         return ret;
 817 }
 818
 819 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 820 {
 821         int ret = 0;
 822
 823         if (open_mode & O_EXCL)
 824                 goto out;
 825         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 826                 case FMODE_READ:
 827                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 828                                 && state->n_rdonly != 0;
 829                         break;
 830                 case FMODE_WRITE:
 831                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 832                                 && state->n_wronly != 0;
 833                         break;
 834                 case FMODE_READ|FMODE_WRITE:
 835                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 836                                 && state->n_rdwr != 0;
 837         }
 838 out:
 839         return ret;
 840 }
 841
 842 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 843 {
 844         if ((delegation->type & fmode) != fmode)
 845                 return 0;
 846         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 847                 return 0;
 848         nfs_mark_delegation_referenced(delegation);
 849         return 1;
 850 }
 851
 852 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 853 {
 854         switch (fmode) {
 855                 case FMODE_WRITE:
 856                         state->n_wronly++;
 857                         break;
 858                 case FMODE_READ:
 859                         state->n_rdonly++;
 860                         break;
 861                 case FMODE_READ|FMODE_WRITE:
 862                         state->n_rdwr++;
 863         }
 864         nfs4_state_set_mode_locked(state, state->state | fmode);
 865 }
 866
 867 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 868 {
 869         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 870                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 871         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 872         switch (fmode) {
 873                 case FMODE_READ:
 874                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 875                         break;
 876                 case FMODE_WRITE:
 877                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 878                         break;
 879                 case FMODE_READ|FMODE_WRITE:
 880                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 881         }
 882 }
 883
 884 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 885 {
 886         write_seqlock(&state->seqlock);
 887         nfs_set_open_stateid_locked(state, stateid, fmode);
 888         write_sequnlock(&state->seqlock);
 889 }
 890
 891 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 892 {
 893         /*
 894          * Protect the call to nfs4_state_set_mode_locked and
 895          * serialise the stateid update
 896          */
 897         write_seqlock(&state->seqlock);
 898         if (deleg_stateid != NULL) {
 899                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 900                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 901         }
 902         if (open_stateid != NULL)
 903                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 904         write_sequnlock(&state->seqlock);
 905         spin_lock(&state->owner->so_lock);
 906         update_open_stateflags(state, fmode);
 907         spin_unlock(&state->owner->so_lock);
 908 }
 909
 910 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 911 {
 912         struct nfs_inode *nfsi = NFS_I(state->inode);
 913         struct nfs_delegation *deleg_cur;
 914         int ret = 0;
 915
 916         fmode &= (FMODE_READ|FMODE_WRITE);
 917
 918         rcu_read_lock();
 919         deleg_cur = rcu_dereference(nfsi->delegation);
 920         if (deleg_cur == NULL)
 921                 goto no_delegation;
 922
 923         spin_lock(&deleg_cur->lock);
 924         if (nfsi->delegation != deleg_cur ||
 925             (deleg_cur->type & fmode) != fmode)
 926                 goto no_delegation_unlock;
 927
 928         if (delegation == NULL)
 929                 delegation = &deleg_cur->stateid;
 930         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 931                 goto no_delegation_unlock;
 932
 933         nfs_mark_delegation_referenced(deleg_cur);
 934         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 935         ret = 1;
 936 no_delegation_unlock:
 937         spin_unlock(&deleg_cur->lock);
 938 no_delegation:
 939         rcu_read_unlock();
 940
 941         if (!ret && open_stateid != NULL) {
 942                 __update_open_stateid(state, open_stateid, NULL, fmode);
 943                 ret = 1;
 944         }
 945
 946         return ret;
 947 }
 948
 949
 950 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 951 {
 952         struct nfs_delegation *delegation;
 953
 954         rcu_read_lock();
 955         delegation = rcu_dereference(NFS_I(inode)->delegation);
 956         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 957                 rcu_read_unlock();
 958                 return;
 959         }
 960         rcu_read_unlock();
 961         nfs_inode_return_delegation(inode);
 962 }
 963
 964 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 965 {
 966         struct nfs4_state *state = opendata->state;
 967         struct nfs_inode *nfsi = NFS_I(state->inode);
 968         struct nfs_delegation *delegation;
 969         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 970         fmode_t fmode = opendata->o_arg.fmode;
 971         nfs4_stateid stateid;
 972         int ret = -EAGAIN;
 973
 974         for (;;) {
 975                 if (can_open_cached(state, fmode, open_mode)) {
 976                         spin_lock(&state->owner->so_lock);
 977                         if (can_open_cached(state, fmode, open_mode)) {
 978                                 update_open_stateflags(state, fmode);
 979                                 spin_unlock(&state->owner->so_lock);
 980                                 goto out_return_state;
 981                         }
 982                         spin_unlock(&state->owner->so_lock);
 983                 }
 984                 rcu_read_lock();
 985                 delegation = rcu_dereference(nfsi->delegation);
 986                 if (delegation == NULL ||
 987                     !can_open_delegated(delegation, fmode)) {
 988                         rcu_read_unlock();
 989                         break;
 990                 }
 991                 /* Save the delegation */
 992                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 993                 rcu_read_unlock();
 994                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 995                 if (ret != 0)
 996                         goto out;
 997                 ret = -EAGAIN;
 998
 999                 /* Try to update the stateid using the delegation */
1000                 if (update_open_stateid(state, NULL, &stateid, fmode))
1001                         goto out_return_state;
1002         }
1003 out:
1004         return ERR_PTR(ret);
1005 out_return_state:
1006         atomic_inc(&state->count);
1007         return state;
1008 }
1009
1010 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1011 {
1012         struct inode *inode;
1013         struct nfs4_state *state = NULL;
1014         struct nfs_delegation *delegation;
1015         int ret;
1016
1017         if (!data->rpc_done) {
1018                 state = nfs4_try_open_cached(data);
1019                 goto out;
1020         }
1021
1022         ret = -EAGAIN;
1023         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1024                 goto err;
1025         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1026         ret = PTR_ERR(inode);
1027         if (IS_ERR(inode))
1028                 goto err;
1029         ret = -ENOMEM;
1030         state = nfs4_get_open_state(inode, data->owner);
1031         if (state == NULL)
1032                 goto err_put_inode;
1033         if (data->o_res.delegation_type != 0) {
1034                 int delegation_flags = 0;
1035
1036                 rcu_read_lock();
1037                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1038                 if (delegation)
1039                         delegation_flags = delegation->flags;
1040                 rcu_read_unlock();
1041                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1042                         nfs_inode_set_delegation(state->inode,
1043                                         data->owner->so_cred,
1044                                         &data->o_res);
1045                 else
1046                         nfs_inode_reclaim_delegation(state->inode,
1047                                         data->owner->so_cred,
1048                                         &data->o_res);
1049         }
1050
1051         update_open_stateid(state, &data->o_res.stateid, NULL,
1052                         data->o_arg.fmode);
1053         iput(inode);
1054 out:
1055         return state;
1056 err_put_inode:
1057         iput(inode);
1058 err:
1059         return ERR_PTR(ret);
1060 }
1061
1062 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1063 {
1064         struct nfs_inode *nfsi = NFS_I(state->inode);
1065         struct nfs_open_context *ctx;
1066
1067         spin_lock(&state->inode->i_lock);
1068         list_for_each_entry(ctx, &nfsi->open_files, list) {
1069                 if (ctx->state != state)
1070                         continue;
1071                 get_nfs_open_context(ctx);
1072                 spin_unlock(&state->inode->i_lock);
1073                 return ctx;
1074         }
1075         spin_unlock(&state->inode->i_lock);
1076         return ERR_PTR(-ENOENT);
1077 }
1078
1079 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1080 {
1081         struct nfs4_opendata *opendata;
1082
1083         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1084         if (opendata == NULL)
1085                 return ERR_PTR(-ENOMEM);
1086         opendata->state = state;
1087         atomic_inc(&state->count);
1088         return opendata;
1089 }
1090
1091 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1092 {
1093         struct nfs4_state *newstate;
1094         int ret;
1095
1096         opendata->o_arg.open_flags = 0;
1097         opendata->o_arg.fmode = fmode;
1098         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1099         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1100         nfs4_init_opendata_res(opendata);
1101         ret = _nfs4_recover_proc_open(opendata);
1102         if (ret != 0)
1103                 return ret;
1104         newstate = nfs4_opendata_to_nfs4_state(opendata);
1105         if (IS_ERR(newstate))
1106                 return PTR_ERR(newstate);
1107         nfs4_close_state(&opendata->path, newstate, fmode);
1108         *res = newstate;
1109         return 0;
1110 }
1111
1112 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1113 {
1114         struct nfs4_state *newstate;
1115         int ret;
1116
1117         /* memory barrier prior to reading state->n_* */
1118         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1119         smp_rmb();
1120         if (state->n_rdwr != 0) {
1121                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1122                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1123                 if (ret != 0)
1124                         return ret;
1125                 if (newstate != state)
1126                         return -ESTALE;
1127         }
1128         if (state->n_wronly != 0) {
1129                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1130                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1131                 if (ret != 0)
1132                         return ret;
1133                 if (newstate != state)
1134                         return -ESTALE;
1135         }
1136         if (state->n_rdonly != 0) {
1137                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1138                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1139                 if (ret != 0)
1140                         return ret;
1141                 if (newstate != state)
1142                         return -ESTALE;
1143         }
1144         /*
1145          * We may have performed cached opens for all three recoveries.
1146          * Check if we need to update the current stateid.
1147          */
1148         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1149             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1150                 write_seqlock(&state->seqlock);
1151                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1152                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1153                 write_sequnlock(&state->seqlock);
1154         }
1155         return 0;
1156 }
1157
1158 /*
1159  * OPEN_RECLAIM:
1160  *      reclaim state on the server after a reboot.
1161  */
1162 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1163 {
1164         struct nfs_delegation *delegation;
1165         struct nfs4_opendata *opendata;
1166         fmode_t delegation_type = 0;
1167         int status;
1168
1169         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1170         if (IS_ERR(opendata))
1171                 return PTR_ERR(opendata);
1172         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1173         opendata->o_arg.fh = NFS_FH(state->inode);
1174         rcu_read_lock();
1175         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1176         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1177                 delegation_type = delegation->type;
1178         rcu_read_unlock();
1179         opendata->o_arg.u.delegation_type = delegation_type;
1180         status = nfs4_open_recover(opendata, state);
1181         nfs4_opendata_put(opendata);
1182         return status;
1183 }
1184
1185 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1186 {
1187         struct nfs_server *server = NFS_SERVER(state->inode);
1188         struct nfs4_exception exception = { };
1189         int err;
1190         do {
1191                 err = _nfs4_do_open_reclaim(ctx, state);
1192                 if (err != -NFS4ERR_DELAY)
1193                         break;
1194                 nfs4_handle_exception(server, err, &exception);
1195         } while (exception.retry);
1196         return err;
1197 }
1198
1199 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1200 {
1201         struct nfs_open_context *ctx;
1202         int ret;
1203
1204         ctx = nfs4_state_find_open_context(state);
1205         if (IS_ERR(ctx))
1206                 return PTR_ERR(ctx);
1207         ret = nfs4_do_open_reclaim(ctx, state);
1208         put_nfs_open_context(ctx);
1209         return ret;
1210 }
1211
1212 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1213 {
1214         struct nfs4_opendata *opendata;
1215         int ret;
1216
1217         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1218         if (IS_ERR(opendata))
1219                 return PTR_ERR(opendata);
1220         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1221         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1222                         sizeof(opendata->o_arg.u.delegation.data));
1223         ret = nfs4_open_recover(opendata, state);
1224         nfs4_opendata_put(opendata);
1225         return ret;
1226 }
1227
1228 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1229 {
1230         struct nfs4_exception exception = { };
1231         struct nfs_server *server = NFS_SERVER(state->inode);
1232         int err;
1233         do {
1234                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1235                 switch (err) {
1236                         case 0:
1237                         case -ENOENT:
1238                         case -ESTALE:
1239                                 goto out;
1240                         case -NFS4ERR_BADSESSION:
1241                         case -NFS4ERR_BADSLOT:
1242                         case -NFS4ERR_BAD_HIGH_SLOT:
1243                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1244                         case -NFS4ERR_DEADSESSION:
1245                                 nfs4_schedule_state_recovery(
1246                                         server->nfs_client);
1247                                 goto out;
1248                         case -NFS4ERR_STALE_CLIENTID:
1249                         case -NFS4ERR_STALE_STATEID:
1250                         case -NFS4ERR_EXPIRED:
1251                                 /* Don't recall a delegation if it was lost */
1252                                 nfs4_schedule_state_recovery(server->nfs_client);
1253                                 goto out;
1254                         case -ERESTARTSYS:
1255                                 /*
1256                                  * The show must go on: exit, but mark the
1257                                  * stateid as needing recovery.
1258                                  */
1259                         case -NFS4ERR_ADMIN_REVOKED:
1260                         case -NFS4ERR_BAD_STATEID:
1261                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1262                         case -EKEYEXPIRED:
1263                                 /*
1264                                  * User RPCSEC_GSS context has expired.
1265                                  * We cannot recover this stateid now, so
1266                                  * skip it and allow recovery thread to
1267                                  * proceed.
1268                                  */
1269                         case -ENOMEM:
1270                                 err = 0;
1271                                 goto out;
1272                 }
1273                 err = nfs4_handle_exception(server, err, &exception);
1274         } while (exception.retry);
1275 out:
1276         return err;
1277 }
1278
1279 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1280 {
1281         struct nfs4_opendata *data = calldata;
1282
1283         data->rpc_status = task->tk_status;
1284         if (data->rpc_status == 0) {
1285                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1286                                 sizeof(data->o_res.stateid.data));
1287                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1288                 renew_lease(data->o_res.server, data->timestamp);
1289                 data->rpc_done = 1;
1290         }
1291 }
1292
1293 static void nfs4_open_confirm_release(void *calldata)
1294 {
1295         struct nfs4_opendata *data = calldata;
1296         struct nfs4_state *state = NULL;
1297
1298         /* If this request hasn't been cancelled, do nothing */
1299         if (data->cancelled == 0)
1300                 goto out_free;
1301         /* In case of error, no cleanup! */
1302         if (!data->rpc_done)
1303                 goto out_free;
1304         state = nfs4_opendata_to_nfs4_state(data);
1305         if (!IS_ERR(state))
1306                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1307 out_free:
1308         nfs4_opendata_put(data);
1309 }
1310
1311 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1312         .rpc_call_done = nfs4_open_confirm_done,
1313         .rpc_release = nfs4_open_confirm_release,
1314 };
1315
1316 /*
1317  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1318  */
1319 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1320 {
1321         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1322         struct rpc_task *task;
1323         struct  rpc_message msg = {
1324                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1325                 .rpc_argp = &data->c_arg,
1326                 .rpc_resp = &data->c_res,
1327                 .rpc_cred = data->owner->so_cred,
1328         };
1329         struct rpc_task_setup task_setup_data = {
1330                 .rpc_client = server->client,
1331                 .rpc_message = &msg,
1332                 .callback_ops = &nfs4_open_confirm_ops,
1333                 .callback_data = data,
1334                 .workqueue = nfsiod_workqueue,
1335                 .flags = RPC_TASK_ASYNC,
1336         };
1337         int status;
1338
1339         kref_get(&data->kref);
1340         data->rpc_done = 0;
1341         data->rpc_status = 0;
1342         data->timestamp = jiffies;
1343         task = rpc_run_task(&task_setup_data);
1344         if (IS_ERR(task))
1345                 return PTR_ERR(task);
1346         status = nfs4_wait_for_completion_rpc_task(task);
1347         if (status != 0) {
1348                 data->cancelled = 1;
1349                 smp_wmb();
1350         } else
1351                 status = data->rpc_status;
1352         rpc_put_task(task);
1353         return status;
1354 }
1355
1356 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1357 {
1358         struct nfs4_opendata *data = calldata;
1359         struct nfs4_state_owner *sp = data->owner;
1360
1361         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1362                 return;
1363         /*
1364          * Check if we still need to send an OPEN call, or if we can use
1365          * a delegation instead.
1366          */
1367         if (data->state != NULL) {
1368                 struct nfs_delegation *delegation;
1369
1370                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1371                         goto out_no_action;
1372                 rcu_read_lock();
1373                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1374                 if (delegation != NULL &&
1375                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1376                         rcu_read_unlock();
1377                         goto out_no_action;
1378                 }
1379                 rcu_read_unlock();
1380         }
1381         /* Update sequence id. */
1382         data->o_arg.id = sp->so_owner_id.id;
1383         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1384         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1385                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1386                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1387         }
1388         data->timestamp = jiffies;
1389         if (nfs4_setup_sequence(data->o_arg.server,
1390                                 &data->o_arg.seq_args,
1391                                 &data->o_res.seq_res, 1, task))
1392                 return;
1393         rpc_call_start(task);
1394         return;
1395 out_no_action:
1396         task->tk_action = NULL;
1397
1398 }
1399
1400 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1401 {
1402         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1403         nfs4_open_prepare(task, calldata);
1404 }
1405
1406 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1407 {
1408         struct nfs4_opendata *data = calldata;
1409
1410         data->rpc_status = task->tk_status;
1411
1412         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1413                 return;
1414
1415         if (task->tk_status == 0) {
1416                 switch (data->o_res.f_attr->mode & S_IFMT) {
1417                         case S_IFREG:
1418                                 break;
1419                         case S_IFLNK:
1420                                 data->rpc_status = -ELOOP;
1421                                 break;
1422                         case S_IFDIR:
1423                                 data->rpc_status = -EISDIR;
1424                                 break;
1425                         default:
1426                                 data->rpc_status = -ENOTDIR;
1427                 }
1428                 renew_lease(data->o_res.server, data->timestamp);
1429                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1430                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1431         }
1432         data->rpc_done = 1;
1433 }
1434
1435 static void nfs4_open_release(void *calldata)
1436 {
1437         struct nfs4_opendata *data = calldata;
1438         struct nfs4_state *state = NULL;
1439
1440         /* If this request hasn't been cancelled, do nothing */
1441         if (data->cancelled == 0)
1442                 goto out_free;
1443         /* In case of error, no cleanup! */
1444         if (data->rpc_status != 0 || !data->rpc_done)
1445                 goto out_free;
1446         /* In case we need an open_confirm, no cleanup! */
1447         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1448                 goto out_free;
1449         state = nfs4_opendata_to_nfs4_state(data);
1450         if (!IS_ERR(state))
1451                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1452 out_free:
1453         nfs4_opendata_put(data);
1454 }
1455
1456 static const struct rpc_call_ops nfs4_open_ops = {
1457         .rpc_call_prepare = nfs4_open_prepare,
1458         .rpc_call_done = nfs4_open_done,
1459         .rpc_release = nfs4_open_release,
1460 };
1461
1462 static const struct rpc_call_ops nfs4_recover_open_ops = {
1463         .rpc_call_prepare = nfs4_recover_open_prepare,
1464         .rpc_call_done = nfs4_open_done,
1465         .rpc_release = nfs4_open_release,
1466 };
1467
1468 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1469 {
1470         struct inode *dir = data->dir->d_inode;
1471         struct nfs_server *server = NFS_SERVER(dir);
1472         struct nfs_openargs *o_arg = &data->o_arg;
1473         struct nfs_openres *o_res = &data->o_res;
1474         struct rpc_task *task;
1475         struct rpc_message msg = {
1476                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1477                 .rpc_argp = o_arg,
1478                 .rpc_resp = o_res,
1479                 .rpc_cred = data->owner->so_cred,
1480         };
1481         struct rpc_task_setup task_setup_data = {
1482                 .rpc_client = server->client,
1483                 .rpc_message = &msg,
1484                 .callback_ops = &nfs4_open_ops,
1485                 .callback_data = data,
1486                 .workqueue = nfsiod_workqueue,
1487                 .flags = RPC_TASK_ASYNC,
1488         };
1489         int status;
1490
1491         kref_get(&data->kref);
1492         data->rpc_done = 0;
1493         data->rpc_status = 0;
1494         data->cancelled = 0;
1495         if (isrecover)
1496                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1497         task = rpc_run_task(&task_setup_data);
1498         if (IS_ERR(task))
1499                 return PTR_ERR(task);
1500         status = nfs4_wait_for_completion_rpc_task(task);
1501         if (status != 0) {
1502                 data->cancelled = 1;
1503                 smp_wmb();
1504         } else
1505                 status = data->rpc_status;
1506         rpc_put_task(task);
1507
1508         return status;
1509 }
1510
1511 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1512 {
1513         struct inode *dir = data->dir->d_inode;
1514         struct nfs_openres *o_res = &data->o_res;
1515         int status;
1516
1517         status = nfs4_run_open_task(data, 1);
1518         if (status != 0 || !data->rpc_done)
1519                 return status;
1520
1521         nfs_refresh_inode(dir, o_res->dir_attr);
1522
1523         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1524                 status = _nfs4_proc_open_confirm(data);
1525                 if (status != 0)
1526                         return status;
1527         }
1528
1529         return status;
1530 }
1531
1532 /*
1533  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1534  */
1535 static int _nfs4_proc_open(struct nfs4_opendata *data)
1536 {
1537         struct inode *dir = data->dir->d_inode;
1538         struct nfs_server *server = NFS_SERVER(dir);
1539         struct nfs_openargs *o_arg = &data->o_arg;
1540         struct nfs_openres *o_res = &data->o_res;
1541         int status;
1542
1543         status = nfs4_run_open_task(data, 0);
1544         if (status != 0 || !data->rpc_done)
1545                 return status;
1546
1547         if (o_arg->open_flags & O_CREAT) {
1548                 update_changeattr(dir, &o_res->cinfo);
1549                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1550         } else
1551                 nfs_refresh_inode(dir, o_res->dir_attr);
1552         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1553                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1554         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1555                 status = _nfs4_proc_open_confirm(data);
1556                 if (status != 0)
1557                         return status;
1558         }
1559         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1560                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1561         return 0;
1562 }
1563
1564 static int nfs4_recover_expired_lease(struct nfs_server *server)
1565 {
1566         struct nfs_client *clp = server->nfs_client;
1567         unsigned int loop;
1568         int ret;
1569
1570         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1571                 ret = nfs4_wait_clnt_recover(clp);
1572                 if (ret != 0)
1573                         break;
1574                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1575                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1576                         break;
1577                 nfs4_schedule_state_recovery(clp);
1578                 ret = -EIO;
1579         }
1580         return ret;
1581 }
1582
1583 /*
1584  * OPEN_EXPIRED:
1585  *      reclaim state on the server after a network partition.
1586  *      Assumes caller holds the appropriate lock
1587  */
1588 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1589 {
1590         struct nfs4_opendata *opendata;
1591         int ret;
1592
1593         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1594         if (IS_ERR(opendata))
1595                 return PTR_ERR(opendata);
1596         ret = nfs4_open_recover(opendata, state);
1597         if (ret == -ESTALE)
1598                 d_drop(ctx->path.dentry);
1599         nfs4_opendata_put(opendata);
1600         return ret;
1601 }
1602
1603 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1604 {
1605         struct nfs_server *server = NFS_SERVER(state->inode);
1606         struct nfs4_exception exception = { };
1607         int err;
1608
1609         do {
1610                 err = _nfs4_open_expired(ctx, state);
1611                 switch (err) {
1612                 default:
1613                         goto out;
1614                 case -NFS4ERR_GRACE:
1615                 case -NFS4ERR_DELAY:
1616                         nfs4_handle_exception(server, err, &exception);
1617                         err = 0;
1618                 }
1619         } while (exception.retry);
1620 out:
1621         return err;
1622 }
1623
1624 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1625 {
1626         struct nfs_open_context *ctx;
1627         int ret;
1628
1629         ctx = nfs4_state_find_open_context(state);
1630         if (IS_ERR(ctx))
1631                 return PTR_ERR(ctx);
1632         ret = nfs4_do_open_expired(ctx, state);
1633         put_nfs_open_context(ctx);
1634         return ret;
1635 }
1636
1637 /*
1638  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1639  * fields corresponding to attributes that were used to store the verifier.
1640  * Make sure we clobber those fields in the later setattr call
1641  */
1642 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1643 {
1644         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1645             !(sattr->ia_valid & ATTR_ATIME_SET))
1646                 sattr->ia_valid |= ATTR_ATIME;
1647
1648         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1649             !(sattr->ia_valid & ATTR_MTIME_SET))
1650                 sattr->ia_valid |= ATTR_MTIME;
1651 }
1652
1653 /*
1654  * Returns a referenced nfs4_state
1655  */
1656 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)
1657 {
1658         struct nfs4_state_owner  *sp;
1659         struct nfs4_state     *state = NULL;
1660         struct nfs_server       *server = NFS_SERVER(dir);
1661         struct nfs4_opendata *opendata;
1662         int status;
1663
1664         /* Protect against reboot recovery conflicts */
1665         status = -ENOMEM;
1666         if (!(sp = nfs4_get_state_owner(server, cred))) {
1667                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1668                 goto out_err;
1669         }
1670         status = nfs4_recover_expired_lease(server);
1671         if (status != 0)
1672                 goto err_put_state_owner;
1673         if (path->dentry->d_inode != NULL)
1674                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1675         status = -ENOMEM;
1676         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1677         if (opendata == NULL)
1678                 goto err_put_state_owner;
1679
1680         if (path->dentry->d_inode != NULL)
1681                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1682
1683         status = _nfs4_proc_open(opendata);
1684         if (status != 0)
1685                 goto err_opendata_put;
1686
1687         state = nfs4_opendata_to_nfs4_state(opendata);
1688         status = PTR_ERR(state);
1689         if (IS_ERR(state))
1690                 goto err_opendata_put;
1691         if (server->caps & NFS_CAP_POSIX_LOCK)
1692                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1693
1694         if (opendata->o_arg.open_flags & O_EXCL) {
1695                 nfs4_exclusive_attrset(opendata, sattr);
1696
1697                 nfs_fattr_init(opendata->o_res.f_attr);
1698                 status = nfs4_do_setattr(state->inode, cred,
1699                                 opendata->o_res.f_attr, sattr,
1700                                 state);
1701                 if (status == 0)
1702                         nfs_setattr_update_inode(state->inode, sattr);
1703                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1704         }
1705         nfs4_opendata_put(opendata);
1706         nfs4_put_state_owner(sp);
1707         *res = state;
1708         return 0;
1709 err_opendata_put:
1710         nfs4_opendata_put(opendata);
1711 err_put_state_owner:
1712         nfs4_put_state_owner(sp);
1713 out_err:
1714         *res = NULL;
1715         return status;
1716 }
1717
1718
1719 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)
1720 {
1721         struct nfs4_exception exception = { };
1722         struct nfs4_state *res;
1723         int status;
1724
1725         do {
1726                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1727                 if (status == 0)
1728                         break;
1729                 /* NOTE: BAD_SEQID means the server and client disagree about the
1730                  * book-keeping w.r.t. state-changing operations
1731                  * (OPEN/CLOSE/LOCK/LOCKU...)
1732                  * It is actually a sign of a bug on the client or on the server.
1733                  *
1734                  * If we receive a BAD_SEQID error in the particular case of
1735                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1736                  * have unhashed the old state_owner for us, and that we can
1737                  * therefore safely retry using a new one. We should still warn
1738                  * the user though...
1739                  */
1740                 if (status == -NFS4ERR_BAD_SEQID) {
1741                         printk(KERN_WARNING "NFS: v4 server %s "
1742                                         " returned a bad sequence-id error!\n",
1743                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1744                         exception.retry = 1;
1745                         continue;
1746                 }
1747                 /*
1748                  * BAD_STATEID on OPEN means that the server cancelled our
1749                  * state before it received the OPEN_CONFIRM.
1750                  * Recover by retrying the request as per the discussion
1751                  * on Page 181 of RFC3530.
1752                  */
1753                 if (status == -NFS4ERR_BAD_STATEID) {
1754                         exception.retry = 1;
1755                         continue;
1756                 }
1757                 if (status == -EAGAIN) {
1758                         /* We must have found a delegation */
1759                         exception.retry = 1;
1760                         continue;
1761                 }
1762                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1763                                         status, &exception));
1764         } while (exception.retry);
1765         return res;
1766 }
1767
1768 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1769                             struct nfs_fattr *fattr, struct iattr *sattr,
1770                             struct nfs4_state *state)
1771 {
1772         struct nfs_server *server = NFS_SERVER(inode);
1773         struct nfs_setattrargs  arg = {
1774                 .fh             = NFS_FH(inode),
1775                 .iap            = sattr,
1776                 .server         = server,
1777                 .bitmask = server->attr_bitmask,
1778         };
1779         struct nfs_setattrres  res = {
1780                 .fattr          = fattr,
1781                 .server         = server,
1782         };
1783         struct rpc_message msg = {
1784                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1785                 .rpc_argp       = &arg,
1786                 .rpc_resp       = &res,
1787                 .rpc_cred       = cred,
1788         };
1789         unsigned long timestamp = jiffies;
1790         int status;
1791
1792         nfs_fattr_init(fattr);
1793
1794         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1795                 /* Use that stateid */
1796         } else if (state != NULL) {
1797                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1798         } else
1799                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1800
1801         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1802         if (status == 0 && state != NULL)
1803                 renew_lease(server, timestamp);
1804         return status;
1805 }
1806
1807 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1808                            struct nfs_fattr *fattr, struct iattr *sattr,
1809                            struct nfs4_state *state)
1810 {
1811         struct nfs_server *server = NFS_SERVER(inode);
1812         struct nfs4_exception exception = { };
1813         int err;
1814         do {
1815                 err = nfs4_handle_exception(server,
1816                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1817                                 &exception);
1818         } while (exception.retry);
1819         return err;
1820 }
1821
1822 struct nfs4_closedata {
1823         struct path path;
1824         struct inode *inode;
1825         struct nfs4_state *state;
1826         struct nfs_closeargs arg;
1827         struct nfs_closeres res;
1828         struct nfs_fattr fattr;
1829         unsigned long timestamp;
1830 };
1831
1832 static void nfs4_free_closedata(void *data)
1833 {
1834         struct nfs4_closedata *calldata = data;
1835         struct nfs4_state_owner *sp = calldata->state->owner;
1836
1837         nfs4_put_open_state(calldata->state);
1838         nfs_free_seqid(calldata->arg.seqid);
1839         nfs4_put_state_owner(sp);
1840         path_put(&calldata->path);
1841         kfree(calldata);
1842 }
1843
1844 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1845                 fmode_t fmode)
1846 {
1847         spin_lock(&state->owner->so_lock);
1848         if (!(fmode & FMODE_READ))
1849                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1850         if (!(fmode & FMODE_WRITE))
1851                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1852         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1853         spin_unlock(&state->owner->so_lock);
1854 }
1855
1856 static void nfs4_close_done(struct rpc_task *task, void *data)
1857 {
1858         struct nfs4_closedata *calldata = data;
1859         struct nfs4_state *state = calldata->state;
1860         struct nfs_server *server = NFS_SERVER(calldata->inode);
1861
1862         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1863                 return;
1864         /* hmm. we are done with the inode, and in the process of freeing
1865          * the state_owner. we keep this around to process errors
1866          */
1867         switch (task->tk_status) {
1868                 case 0:
1869                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1870                         renew_lease(server, calldata->timestamp);
1871                         nfs4_close_clear_stateid_flags(state,
1872                                         calldata->arg.fmode);
1873                         break;
1874                 case -NFS4ERR_STALE_STATEID:
1875                 case -NFS4ERR_OLD_STATEID:
1876                 case -NFS4ERR_BAD_STATEID:
1877                 case -NFS4ERR_EXPIRED:
1878                         if (calldata->arg.fmode == 0)
1879                                 break;
1880                 default:
1881                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1882                                 rpc_restart_call_prepare(task);
1883         }
1884         nfs_release_seqid(calldata->arg.seqid);
1885         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1886 }
1887
1888 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1889 {
1890         struct nfs4_closedata *calldata = data;
1891         struct nfs4_state *state = calldata->state;
1892         int call_close = 0;
1893
1894         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1895                 return;
1896
1897         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1898         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1899         spin_lock(&state->owner->so_lock);
1900         /* Calculate the change in open mode */
1901         if (state->n_rdwr == 0) {
1902                 if (state->n_rdonly == 0) {
1903                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1904                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1905                         calldata->arg.fmode &= ~FMODE_READ;
1906                 }
1907                 if (state->n_wronly == 0) {
1908                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1909                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1910                         calldata->arg.fmode &= ~FMODE_WRITE;
1911                 }
1912         }
1913         spin_unlock(&state->owner->so_lock);
1914
1915         if (!call_close) {
1916                 /* Note: exit _without_ calling nfs4_close_done */
1917                 task->tk_action = NULL;
1918                 return;
1919         }
1920
1921         if (calldata->arg.fmode == 0)
1922                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1923
1924         nfs_fattr_init(calldata->res.fattr);
1925         calldata->timestamp = jiffies;
1926         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1927                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1928                                 1, task))
1929                 return;
1930         rpc_call_start(task);
1931 }
1932
1933 static const struct rpc_call_ops nfs4_close_ops = {
1934         .rpc_call_prepare = nfs4_close_prepare,
1935         .rpc_call_done = nfs4_close_done,
1936         .rpc_release = nfs4_free_closedata,
1937 };
1938
1939 /*
1940  * It is possible for data to be read/written from a mem-mapped file
1941  * after the sys_close call (which hits the vfs layer as a flush).
1942  * This means that we can't safely call nfsv4 close on a file until
1943  * the inode is cleared. This in turn means that we are not good
1944  * NFSv4 citizens - we do not indicate to the server to update the file's
1945  * share state even when we are done with one of the three share
1946  * stateid's in the inode.
1947  *
1948  * NOTE: Caller must be holding the sp->so_owner semaphore!
1949  */
1950 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1951 {
1952         struct nfs_server *server = NFS_SERVER(state->inode);
1953         struct nfs4_closedata *calldata;
1954         struct nfs4_state_owner *sp = state->owner;
1955         struct rpc_task *task;
1956         struct rpc_message msg = {
1957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1958                 .rpc_cred = state->owner->so_cred,
1959         };
1960         struct rpc_task_setup task_setup_data = {
1961                 .rpc_client = server->client,
1962                 .rpc_message = &msg,
1963                 .callback_ops = &nfs4_close_ops,
1964                 .workqueue = nfsiod_workqueue,
1965                 .flags = RPC_TASK_ASYNC,
1966         };
1967         int status = -ENOMEM;
1968
1969         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1970         if (calldata == NULL)
1971                 goto out;
1972         calldata->inode = state->inode;
1973         calldata->state = state;
1974         calldata->arg.fh = NFS_FH(state->inode);
1975         calldata->arg.stateid = &state->open_stateid;
1976         /* Serialization for the sequence id */
1977         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1978         if (calldata->arg.seqid == NULL)
1979                 goto out_free_calldata;
1980         calldata->arg.fmode = 0;
1981         calldata->arg.bitmask = server->cache_consistency_bitmask;
1982         calldata->res.fattr = &calldata->fattr;
1983         calldata->res.seqid = calldata->arg.seqid;
1984         calldata->res.server = server;
1985         path_get(path);
1986         calldata->path = *path;
1987
1988         msg.rpc_argp = &calldata->arg;
1989         msg.rpc_resp = &calldata->res;
1990         task_setup_data.callback_data = calldata;
1991         task = rpc_run_task(&task_setup_data);
1992         if (IS_ERR(task))
1993                 return PTR_ERR(task);
1994         status = 0;
1995         if (wait)
1996                 status = rpc_wait_for_completion_task(task);
1997         rpc_put_task(task);
1998         return status;
1999 out_free_calldata:
2000         kfree(calldata);
2001 out:
2002         nfs4_put_open_state(state);
2003         nfs4_put_state_owner(sp);
2004         return status;
2005 }
2006
2007 static struct inode *
2008 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2009 {
2010         struct nfs4_state *state;
2011
2012         /* Protect against concurrent sillydeletes */
2013         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2014         if (IS_ERR(state))
2015                 return ERR_CAST(state);
2016         ctx->state = state;
2017         return igrab(state->inode);
2018 }
2019
2020 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2021 {
2022         if (ctx->state == NULL)
2023                 return;
2024         if (is_sync)
2025                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2026         else
2027                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2028 }
2029
2030 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2031 {
2032         struct nfs4_server_caps_arg args = {
2033                 .fhandle = fhandle,
2034         };
2035         struct nfs4_server_caps_res res = {};
2036         struct rpc_message msg = {
2037                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2038                 .rpc_argp = &args,
2039                 .rpc_resp = &res,
2040         };
2041         int status;
2042
2043         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2044         if (status == 0) {
2045                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2046                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2047                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2048                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2049                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2050                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2051                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2052                         server->caps |= NFS_CAP_ACLS;
2053                 if (res.has_links != 0)
2054                         server->caps |= NFS_CAP_HARDLINKS;
2055                 if (res.has_symlinks != 0)
2056                         server->caps |= NFS_CAP_SYMLINKS;
2057                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2058                         server->caps |= NFS_CAP_FILEID;
2059                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2060                         server->caps |= NFS_CAP_MODE;
2061                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2062                         server->caps |= NFS_CAP_NLINK;
2063                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2064                         server->caps |= NFS_CAP_OWNER;
2065                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2066                         server->caps |= NFS_CAP_OWNER_GROUP;
2067                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2068                         server->caps |= NFS_CAP_ATIME;
2069                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2070                         server->caps |= NFS_CAP_CTIME;
2071                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2072                         server->caps |= NFS_CAP_MTIME;
2073
2074                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2075                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2076                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2077                 server->acl_bitmask = res.acl_bitmask;
2078         }
2079
2080         return status;
2081 }
2082
2083 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2084 {
2085         struct nfs4_exception exception = { };
2086         int err;
2087         do {
2088                 err = nfs4_handle_exception(server,
2089                                 _nfs4_server_capabilities(server, fhandle),
2090                                 &exception);
2091         } while (exception.retry);
2092         return err;
2093 }
2094
2095 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2096                 struct nfs_fsinfo *info)
2097 {
2098         struct nfs4_lookup_root_arg args = {
2099                 .bitmask = nfs4_fattr_bitmap,
2100         };
2101         struct nfs4_lookup_res res = {
2102                 .server = server,
2103                 .fattr = info->fattr,
2104                 .fh = fhandle,
2105         };
2106         struct rpc_message msg = {
2107                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2108                 .rpc_argp = &args,
2109                 .rpc_resp = &res,
2110         };
2111
2112         nfs_fattr_init(info->fattr);
2113         return nfs4_call_sync(server, &msg, &args, &res, 0);
2114 }
2115
2116 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2117                 struct nfs_fsinfo *info)
2118 {
2119         struct nfs4_exception exception = { };
2120         int err;
2121         do {
2122                 err = nfs4_handle_exception(server,
2123                                 _nfs4_lookup_root(server, fhandle, info),
2124                                 &exception);
2125         } while (exception.retry);
2126         return err;
2127 }
2128
2129 /*
2130  * get the file handle for the "/" directory on the server
2131  */
2132 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2133                               struct nfs_fsinfo *info)
2134 {
2135         int status;
2136
2137         status = nfs4_lookup_root(server, fhandle, info);
2138         if (status == 0)
2139                 status = nfs4_server_capabilities(server, fhandle);
2140         if (status == 0)
2141                 status = nfs4_do_fsinfo(server, fhandle, info);
2142         return nfs4_map_errors(status);
2143 }
2144
2145 /*
2146  * Get locations and (maybe) other attributes of a referral.
2147  * Note that we'll actually follow the referral later when
2148  * we detect fsid mismatch in inode revalidation
2149  */
2150 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2151 {
2152         int status = -ENOMEM;
2153         struct page *page = NULL;
2154         struct nfs4_fs_locations *locations = NULL;
2155
2156         page = alloc_page(GFP_KERNEL);
2157         if (page == NULL)
2158                 goto out;
2159         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2160         if (locations == NULL)
2161                 goto out;
2162
2163         status = nfs4_proc_fs_locations(dir, name, locations, page);
2164         if (status != 0)
2165                 goto out;
2166         /* Make sure server returned a different fsid for the referral */
2167         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2168                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2169                 status = -EIO;
2170                 goto out;
2171         }
2172
2173         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2174         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2175         if (!fattr->mode)
2176                 fattr->mode = S_IFDIR;
2177         memset(fhandle, 0, sizeof(struct nfs_fh));
2178 out:
2179         if (page)
2180                 __free_page(page);
2181         kfree(locations);
2182         return status;
2183 }
2184
2185 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2186 {
2187         struct nfs4_getattr_arg args = {
2188                 .fh = fhandle,
2189                 .bitmask = server->attr_bitmask,
2190         };
2191         struct nfs4_getattr_res res = {
2192                 .fattr = fattr,
2193                 .server = server,
2194         };
2195         struct rpc_message msg = {
2196                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2197                 .rpc_argp = &args,
2198                 .rpc_resp = &res,
2199         };
2200
2201         nfs_fattr_init(fattr);
2202         return nfs4_call_sync(server, &msg, &args, &res, 0);
2203 }
2204
2205 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2206 {
2207         struct nfs4_exception exception = { };
2208         int err;
2209         do {
2210                 err = nfs4_handle_exception(server,
2211                                 _nfs4_proc_getattr(server, fhandle, fattr),
2212                                 &exception);
2213         } while (exception.retry);
2214         return err;
2215 }
2216
2217 /*
2218  * The file is not closed if it is opened due to the a request to change
2219  * the size of the file. The open call will not be needed once the
2220  * VFS layer lookup-intents are implemented.
2221  *
2222  * Close is called when the inode is destroyed.
2223  * If we haven't opened the file for O_WRONLY, we
2224  * need to in the size_change case to obtain a stateid.
2225  *
2226  * Got race?
2227  * Because OPEN is always done by name in nfsv4, it is
2228  * possible that we opened a different file by the same
2229  * name.  We can recognize this race condition, but we
2230  * can't do anything about it besides returning an error.
2231  *
2232  * This will be fixed with VFS changes (lookup-intent).
2233  */
2234 static int
2235 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2236                   struct iattr *sattr)
2237 {
2238         struct inode *inode = dentry->d_inode;
2239         struct rpc_cred *cred = NULL;
2240         struct nfs4_state *state = NULL;
2241         int status;
2242
2243         nfs_fattr_init(fattr);
2244
2245         /* Search for an existing open(O_WRITE) file */
2246         if (sattr->ia_valid & ATTR_FILE) {
2247                 struct nfs_open_context *ctx;
2248
2249                 ctx = nfs_file_open_context(sattr->ia_file);
2250                 if (ctx) {
2251                         cred = ctx->cred;
2252                         state = ctx->state;
2253                 }
2254         }
2255
2256         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2257         if (status == 0)
2258                 nfs_setattr_update_inode(inode, sattr);
2259         return status;
2260 }
2261
2262 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2263                 const struct qstr *name, struct nfs_fh *fhandle,
2264                 struct nfs_fattr *fattr)
2265 {
2266         int                    status;
2267         struct nfs4_lookup_arg args = {
2268                 .bitmask = server->attr_bitmask,
2269                 .dir_fh = dirfh,
2270                 .name = name,
2271         };
2272         struct nfs4_lookup_res res = {
2273                 .server = server,
2274                 .fattr = fattr,
2275                 .fh = fhandle,
2276         };
2277         struct rpc_message msg = {
2278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2279                 .rpc_argp = &args,
2280                 .rpc_resp = &res,
2281         };
2282
2283         nfs_fattr_init(fattr);
2284
2285         dprintk("NFS call  lookupfh %s\n", name->name);
2286         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2287         dprintk("NFS reply lookupfh: %d\n", status);
2288         return status;
2289 }
2290
2291 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2292                               struct qstr *name, struct nfs_fh *fhandle,
2293                               struct nfs_fattr *fattr)
2294 {
2295         struct nfs4_exception exception = { };
2296         int err;
2297         do {
2298                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2299                 /* FIXME: !!!! */
2300                 if (err == -NFS4ERR_MOVED) {
2301                         err = -EREMOTE;
2302                         break;
2303                 }
2304                 err = nfs4_handle_exception(server, err, &exception);
2305         } while (exception.retry);
2306         return err;
2307 }
2308
2309 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2310                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2311 {
2312         int status;
2313
2314         dprintk("NFS call  lookup %s\n", name->name);
2315         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2316         if (status == -NFS4ERR_MOVED)
2317                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2318         dprintk("NFS reply lookup: %d\n", status);
2319         return status;
2320 }
2321
2322 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2323 {
2324         struct nfs4_exception exception = { };
2325         int err;
2326         do {
2327                 err = nfs4_handle_exception(NFS_SERVER(dir),
2328                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2329                                 &exception);
2330         } while (exception.retry);
2331         return err;
2332 }
2333
2334 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2335 {
2336         struct nfs_server *server = NFS_SERVER(inode);
2337         struct nfs4_accessargs args = {
2338                 .fh = NFS_FH(inode),
2339                 .bitmask = server->attr_bitmask,
2340         };
2341         struct nfs4_accessres res = {
2342                 .server = server,
2343         };
2344         struct rpc_message msg = {
2345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2346                 .rpc_argp = &args,
2347                 .rpc_resp = &res,
2348                 .rpc_cred = entry->cred,
2349         };
2350         int mode = entry->mask;
2351         int status;
2352
2353         /*
2354          * Determine which access bits we want to ask for...
2355          */
2356         if (mode & MAY_READ)
2357                 args.access |= NFS4_ACCESS_READ;
2358         if (S_ISDIR(inode->i_mode)) {
2359                 if (mode & MAY_WRITE)
2360                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2361                 if (mode & MAY_EXEC)
2362                         args.access |= NFS4_ACCESS_LOOKUP;
2363         } else {
2364                 if (mode & MAY_WRITE)
2365                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2366                 if (mode & MAY_EXEC)
2367                         args.access |= NFS4_ACCESS_EXECUTE;
2368         }
2369
2370         res.fattr = nfs_alloc_fattr();
2371         if (res.fattr == NULL)
2372                 return -ENOMEM;
2373
2374         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2375         if (!status) {
2376                 entry->mask = 0;
2377                 if (res.access & NFS4_ACCESS_READ)
2378                         entry->mask |= MAY_READ;
2379                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2380                         entry->mask |= MAY_WRITE;
2381                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2382                         entry->mask |= MAY_EXEC;
2383                 nfs_refresh_inode(inode, res.fattr);
2384         }
2385         nfs_free_fattr(res.fattr);
2386         return status;
2387 }
2388
2389 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2390 {
2391         struct nfs4_exception exception = { };
2392         int err;
2393         do {
2394                 err = nfs4_handle_exception(NFS_SERVER(inode),
2395                                 _nfs4_proc_access(inode, entry),
2396                                 &exception);
2397         } while (exception.retry);
2398         return err;
2399 }
2400
2401 /*
2402  * TODO: For the time being, we don't try to get any attributes
2403  * along with any of the zero-copy operations READ, READDIR,
2404  * READLINK, WRITE.
2405  *
2406  * In the case of the first three, we want to put the GETATTR
2407  * after the read-type operation -- this is because it is hard
2408  * to predict the length of a GETATTR response in v4, and thus
2409  * align the READ data correctly.  This means that the GETATTR
2410  * may end up partially falling into the page cache, and we should
2411  * shift it into the 'tail' of the xdr_buf before processing.
2412  * To do this efficiently, we need to know the total length
2413  * of data received, which doesn't seem to be available outside
2414  * of the RPC layer.
2415  *
2416  * In the case of WRITE, we also want to put the GETATTR after
2417  * the operation -- in this case because we want to make sure
2418  * we get the post-operation mtime and size.  This means that
2419  * we can't use xdr_encode_pages() as written: we need a variant
2420  * of it which would leave room in the 'tail' iovec.
2421  *
2422  * Both of these changes to the XDR layer would in fact be quite
2423  * minor, but I decided to leave them for a subsequent patch.
2424  */
2425 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2426                 unsigned int pgbase, unsigned int pglen)
2427 {
2428         struct nfs4_readlink args = {
2429                 .fh       = NFS_FH(inode),
2430                 .pgbase   = pgbase,
2431                 .pglen    = pglen,
2432                 .pages    = &page,
2433         };
2434         struct nfs4_readlink_res res;
2435         struct rpc_message msg = {
2436                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2437                 .rpc_argp = &args,
2438                 .rpc_resp = &res,
2439         };
2440
2441         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2442 }
2443
2444 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2445                 unsigned int pgbase, unsigned int pglen)
2446 {
2447         struct nfs4_exception exception = { };
2448         int err;
2449         do {
2450                 err = nfs4_handle_exception(NFS_SERVER(inode),
2451                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2452                                 &exception);
2453         } while (exception.retry);
2454         return err;
2455 }
2456
2457 /*
2458  * Got race?
2459  * We will need to arrange for the VFS layer to provide an atomic open.
2460  * Until then, this create/open method is prone to inefficiency and race
2461  * conditions due to the lookup, create, and open VFS calls from sys_open()
2462  * placed on the wire.
2463  *
2464  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2465  * The file will be opened again in the subsequent VFS open call
2466  * (nfs4_proc_file_open).
2467  *
2468  * The open for read will just hang around to be used by any process that
2469  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2470  */
2471
2472 static int
2473 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2474                  int flags, struct nfs_open_context *ctx)
2475 {
2476         struct path my_path = {
2477                 .dentry = dentry,
2478         };
2479         struct path *path = &my_path;
2480         struct nfs4_state *state;
2481         struct rpc_cred *cred = NULL;
2482         fmode_t fmode = 0;
2483         int status = 0;
2484
2485         if (ctx != NULL) {
2486                 cred = ctx->cred;
2487                 path = &ctx->path;
2488                 fmode = ctx->mode;
2489         }
2490         sattr->ia_mode &= ~current_umask();
2491         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2492         d_drop(dentry);
2493         if (IS_ERR(state)) {
2494                 status = PTR_ERR(state);
2495                 goto out;
2496         }
2497         d_add(dentry, igrab(state->inode));
2498         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2499         if (ctx != NULL)
2500                 ctx->state = state;
2501         else
2502                 nfs4_close_sync(path, state, fmode);
2503 out:
2504         return status;
2505 }
2506
2507 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2508 {
2509         struct nfs_server *server = NFS_SERVER(dir);
2510         struct nfs_removeargs args = {
2511                 .fh = NFS_FH(dir),
2512                 .name.len = name->len,
2513                 .name.name = name->name,
2514                 .bitmask = server->attr_bitmask,
2515         };
2516         struct nfs_removeres res = {
2517                 .server = server,
2518         };
2519         struct rpc_message msg = {
2520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2521                 .rpc_argp = &args,
2522                 .rpc_resp = &res,
2523         };
2524         int status = -ENOMEM;
2525
2526         res.dir_attr = nfs_alloc_fattr();
2527         if (res.dir_attr == NULL)
2528                 goto out;
2529
2530         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2531         if (status == 0) {
2532                 update_changeattr(dir, &res.cinfo);
2533                 nfs_post_op_update_inode(dir, res.dir_attr);
2534         }
2535         nfs_free_fattr(res.dir_attr);
2536 out:
2537         return status;
2538 }
2539
2540 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2541 {
2542         struct nfs4_exception exception = { };
2543         int err;
2544         do {
2545                 err = nfs4_handle_exception(NFS_SERVER(dir),
2546                                 _nfs4_proc_remove(dir, name),
2547                                 &exception);
2548         } while (exception.retry);
2549         return err;
2550 }
2551
2552 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2553 {
2554         struct nfs_server *server = NFS_SERVER(dir);
2555         struct nfs_removeargs *args = msg->rpc_argp;
2556         struct nfs_removeres *res = msg->rpc_resp;
2557
2558         args->bitmask = server->cache_consistency_bitmask;
2559         res->server = server;
2560         res->seq_res.sr_slot = NULL;
2561         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2562 }
2563
2564 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2565 {
2566         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2567
2568         if (!nfs4_sequence_done(task, &res->seq_res))
2569                 return 0;
2570         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2571                 return 0;
2572         update_changeattr(dir, &res->cinfo);
2573         nfs_post_op_update_inode(dir, res->dir_attr);
2574         return 1;
2575 }
2576
2577 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2578 {
2579         struct nfs_server *server = NFS_SERVER(dir);
2580         struct nfs_renameargs *arg = msg->rpc_argp;
2581         struct nfs_renameres *res = msg->rpc_resp;
2582
2583         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2584         arg->bitmask = server->attr_bitmask;
2585         res->server = server;
2586 }
2587
2588 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2589                                  struct inode *new_dir)
2590 {
2591         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2592
2593         if (!nfs4_sequence_done(task, &res->seq_res))
2594                 return 0;
2595         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2596                 return 0;
2597
2598         update_changeattr(old_dir, &res->old_cinfo);
2599         nfs_post_op_update_inode(old_dir, res->old_fattr);
2600         update_changeattr(new_dir, &res->new_cinfo);
2601         nfs_post_op_update_inode(new_dir, res->new_fattr);
2602         return 1;
2603 }
2604
2605 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2606                 struct inode *new_dir, struct qstr *new_name)
2607 {
2608         struct nfs_server *server = NFS_SERVER(old_dir);
2609         struct nfs_renameargs arg = {
2610                 .old_dir = NFS_FH(old_dir),
2611                 .new_dir = NFS_FH(new_dir),
2612                 .old_name = old_name,
2613                 .new_name = new_name,
2614                 .bitmask = server->attr_bitmask,
2615         };
2616         struct nfs_renameres res = {
2617                 .server = server,
2618         };
2619         struct rpc_message msg = {
2620                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2621                 .rpc_argp = &arg,
2622                 .rpc_resp = &res,
2623         };
2624         int status = -ENOMEM;
2625
2626         res.old_fattr = nfs_alloc_fattr();
2627         res.new_fattr = nfs_alloc_fattr();
2628         if (res.old_fattr == NULL || res.new_fattr == NULL)
2629                 goto out;
2630
2631         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2632         if (!status) {
2633                 update_changeattr(old_dir, &res.old_cinfo);
2634                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2635                 update_changeattr(new_dir, &res.new_cinfo);
2636                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2637         }
2638 out:
2639         nfs_free_fattr(res.new_fattr);
2640         nfs_free_fattr(res.old_fattr);
2641         return status;
2642 }
2643
2644 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2645                 struct inode *new_dir, struct qstr *new_name)
2646 {
2647         struct nfs4_exception exception = { };
2648         int err;
2649         do {
2650                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2651                                 _nfs4_proc_rename(old_dir, old_name,
2652                                         new_dir, new_name),
2653                                 &exception);
2654         } while (exception.retry);
2655         return err;
2656 }
2657
2658 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2659 {
2660         struct nfs_server *server = NFS_SERVER(inode);
2661         struct nfs4_link_arg arg = {
2662                 .fh     = NFS_FH(inode),
2663                 .dir_fh = NFS_FH(dir),
2664                 .name   = name,
2665                 .bitmask = server->attr_bitmask,
2666         };
2667         struct nfs4_link_res res = {
2668                 .server = server,
2669         };
2670         struct rpc_message msg = {
2671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2672                 .rpc_argp = &arg,
2673                 .rpc_resp = &res,
2674         };
2675         int status = -ENOMEM;
2676
2677         res.fattr = nfs_alloc_fattr();
2678         res.dir_attr = nfs_alloc_fattr();
2679         if (res.fattr == NULL || res.dir_attr == NULL)
2680                 goto out;
2681
2682         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2683         if (!status) {
2684                 update_changeattr(dir, &res.cinfo);
2685                 nfs_post_op_update_inode(dir, res.dir_attr);
2686                 nfs_post_op_update_inode(inode, res.fattr);
2687         }
2688 out:
2689         nfs_free_fattr(res.dir_attr);
2690         nfs_free_fattr(res.fattr);
2691         return status;
2692 }
2693
2694 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2695 {
2696         struct nfs4_exception exception = { };
2697         int err;
2698         do {
2699                 err = nfs4_handle_exception(NFS_SERVER(inode),
2700                                 _nfs4_proc_link(inode, dir, name),
2701                                 &exception);
2702         } while (exception.retry);
2703         return err;
2704 }
2705
2706 struct nfs4_createdata {
2707         struct rpc_message msg;
2708         struct nfs4_create_arg arg;
2709         struct nfs4_create_res res;
2710         struct nfs_fh fh;
2711         struct nfs_fattr fattr;
2712         struct nfs_fattr dir_fattr;
2713 };
2714
2715 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2716                 struct qstr *name, struct iattr *sattr, u32 ftype)
2717 {
2718         struct nfs4_createdata *data;
2719
2720         data = kzalloc(sizeof(*data), GFP_KERNEL);
2721         if (data != NULL) {
2722                 struct nfs_server *server = NFS_SERVER(dir);
2723
2724                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2725                 data->msg.rpc_argp = &data->arg;
2726                 data->msg.rpc_resp = &data->res;
2727                 data->arg.dir_fh = NFS_FH(dir);
2728                 data->arg.server = server;
2729                 data->arg.name = name;
2730                 data->arg.attrs = sattr;
2731                 data->arg.ftype = ftype;
2732                 data->arg.bitmask = server->attr_bitmask;
2733                 data->res.server = server;
2734                 data->res.fh = &data->fh;
2735                 data->res.fattr = &data->fattr;
2736                 data->res.dir_fattr = &data->dir_fattr;
2737                 nfs_fattr_init(data->res.fattr);
2738                 nfs_fattr_init(data->res.dir_fattr);
2739         }
2740         return data;
2741 }
2742
2743 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2744 {
2745         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2746                                     &data->arg, &data->res, 1);
2747         if (status == 0) {
2748                 update_changeattr(dir, &data->res.dir_cinfo);
2749                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2750                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2751         }
2752         return status;
2753 }
2754
2755 static void nfs4_free_createdata(struct nfs4_createdata *data)
2756 {
2757         kfree(data);
2758 }
2759
2760 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2761                 struct page *page, unsigned int len, struct iattr *sattr)
2762 {
2763         struct nfs4_createdata *data;
2764         int status = -ENAMETOOLONG;
2765
2766         if (len > NFS4_MAXPATHLEN)
2767                 goto out;
2768
2769         status = -ENOMEM;
2770         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2771         if (data == NULL)
2772                 goto out;
2773
2774         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2775         data->arg.u.symlink.pages = &page;
2776         data->arg.u.symlink.len = len;
2777
2778         status = nfs4_do_create(dir, dentry, data);
2779
2780         nfs4_free_createdata(data);
2781 out:
2782         return status;
2783 }
2784
2785 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2786                 struct page *page, unsigned int len, struct iattr *sattr)
2787 {
2788         struct nfs4_exception exception = { };
2789         int err;
2790         do {
2791                 err = nfs4_handle_exception(NFS_SERVER(dir),
2792                                 _nfs4_proc_symlink(dir, dentry, page,
2793                                                         len, sattr),
2794                                 &exception);
2795         } while (exception.retry);
2796         return err;
2797 }
2798
2799 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2800                 struct iattr *sattr)
2801 {
2802         struct nfs4_createdata *data;
2803         int status = -ENOMEM;
2804
2805         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2806         if (data == NULL)
2807                 goto out;
2808
2809         status = nfs4_do_create(dir, dentry, data);
2810
2811         nfs4_free_createdata(data);
2812 out:
2813         return status;
2814 }
2815
2816 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2817                 struct iattr *sattr)
2818 {
2819         struct nfs4_exception exception = { };
2820         int err;
2821
2822         sattr->ia_mode &= ~current_umask();
2823         do {
2824                 err = nfs4_handle_exception(NFS_SERVER(dir),
2825                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2826                                 &exception);
2827         } while (exception.retry);
2828         return err;
2829 }
2830
2831 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2832                 u64 cookie, struct page **pages, unsigned int count, int plus)
2833 {
2834         struct inode            *dir = dentry->d_inode;
2835         struct nfs4_readdir_arg args = {
2836                 .fh = NFS_FH(dir),
2837                 .pages = pages,
2838                 .pgbase = 0,
2839                 .count = count,
2840                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2841                 .plus = plus,
2842         };
2843         struct nfs4_readdir_res res;
2844         struct rpc_message msg = {
2845                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2846                 .rpc_argp = &args,
2847                 .rpc_resp = &res,
2848                 .rpc_cred = cred,
2849         };
2850         int                     status;
2851
2852         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2853                         dentry->d_parent->d_name.name,
2854                         dentry->d_name.name,
2855                         (unsigned long long)cookie);
2856         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2857         res.pgbase = args.pgbase;
2858         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2859         if (status >= 0) {
2860                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2861                 status += args.pgbase;
2862         }
2863
2864         nfs_invalidate_atime(dir);
2865
2866         dprintk("%s: returns %d\n", __func__, status);
2867         return status;
2868 }
2869
2870 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2871                 u64 cookie, struct page **pages, unsigned int count, int plus)
2872 {
2873         struct nfs4_exception exception = { };
2874         int err;
2875         do {
2876                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2877                                 _nfs4_proc_readdir(dentry, cred, cookie,
2878                                         pages, count, plus),
2879                                 &exception);
2880         } while (exception.retry);
2881         return err;
2882 }
2883
2884 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2885                 struct iattr *sattr, dev_t rdev)
2886 {
2887         struct nfs4_createdata *data;
2888         int mode = sattr->ia_mode;
2889         int status = -ENOMEM;
2890
2891         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2892         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2893
2894         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2895         if (data == NULL)
2896                 goto out;
2897
2898         if (S_ISFIFO(mode))
2899                 data->arg.ftype = NF4FIFO;
2900         else if (S_ISBLK(mode)) {
2901                 data->arg.ftype = NF4BLK;
2902                 data->arg.u.device.specdata1 = MAJOR(rdev);
2903                 data->arg.u.device.specdata2 = MINOR(rdev);
2904         }
2905         else if (S_ISCHR(mode)) {
2906                 data->arg.ftype = NF4CHR;
2907                 data->arg.u.device.specdata1 = MAJOR(rdev);
2908                 data->arg.u.device.specdata2 = MINOR(rdev);
2909         }
2910
2911         status = nfs4_do_create(dir, dentry, data);
2912
2913         nfs4_free_createdata(data);
2914 out:
2915         return status;
2916 }
2917
2918 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2919                 struct iattr *sattr, dev_t rdev)
2920 {
2921         struct nfs4_exception exception = { };
2922         int err;
2923
2924         sattr->ia_mode &= ~current_umask();
2925         do {
2926                 err = nfs4_handle_exception(NFS_SERVER(dir),
2927                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2928                                 &exception);
2929         } while (exception.retry);
2930         return err;
2931 }
2932
2933 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2934                  struct nfs_fsstat *fsstat)
2935 {
2936         struct nfs4_statfs_arg args = {
2937                 .fh = fhandle,
2938                 .bitmask = server->attr_bitmask,
2939         };
2940         struct nfs4_statfs_res res = {
2941                 .fsstat = fsstat,
2942         };
2943         struct rpc_message msg = {
2944                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2945                 .rpc_argp = &args,
2946                 .rpc_resp = &res,
2947         };
2948
2949         nfs_fattr_init(fsstat->fattr);
2950         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2951 }
2952
2953 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2954 {
2955         struct nfs4_exception exception = { };
2956         int err;
2957         do {
2958                 err = nfs4_handle_exception(server,
2959                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2960                                 &exception);
2961         } while (exception.retry);
2962         return err;
2963 }
2964
2965 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2966                 struct nfs_fsinfo *fsinfo)
2967 {
2968         struct nfs4_fsinfo_arg args = {
2969                 .fh = fhandle,
2970                 .bitmask = server->attr_bitmask,
2971         };
2972         struct nfs4_fsinfo_res res = {
2973                 .fsinfo = fsinfo,
2974         };
2975         struct rpc_message msg = {
2976                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2977                 .rpc_argp = &args,
2978                 .rpc_resp = &res,
2979         };
2980
2981         return nfs4_call_sync(server, &msg, &args, &res, 0);
2982 }
2983
2984 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2985 {
2986         struct nfs4_exception exception = { };
2987         int err;
2988
2989         do {
2990                 err = nfs4_handle_exception(server,
2991                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2992                                 &exception);
2993         } while (exception.retry);
2994         return err;
2995 }
2996
2997 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2998 {
2999         nfs_fattr_init(fsinfo->fattr);
3000         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3001 }
3002
3003 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3004                 struct nfs_pathconf *pathconf)
3005 {
3006         struct nfs4_pathconf_arg args = {
3007                 .fh = fhandle,
3008                 .bitmask = server->attr_bitmask,
3009         };
3010         struct nfs4_pathconf_res res = {
3011                 .pathconf = pathconf,
3012         };
3013         struct rpc_message msg = {
3014                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3015                 .rpc_argp = &args,
3016                 .rpc_resp = &res,
3017         };
3018
3019         /* None of the pathconf attributes are mandatory to implement */
3020         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3021                 memset(pathconf, 0, sizeof(*pathconf));
3022                 return 0;
3023         }
3024
3025         nfs_fattr_init(pathconf->fattr);
3026         return nfs4_call_sync(server, &msg, &args, &res, 0);
3027 }
3028
3029 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3030                 struct nfs_pathconf *pathconf)
3031 {
3032         struct nfs4_exception exception = { };
3033         int err;
3034
3035         do {
3036                 err = nfs4_handle_exception(server,
3037                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3038                                 &exception);
3039         } while (exception.retry);
3040         return err;
3041 }
3042
3043 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3044 {
3045         struct nfs_server *server = NFS_SERVER(data->inode);
3046
3047         dprintk("--> %s\n", __func__);
3048
3049         if (!nfs4_sequence_done(task, &data->res.seq_res))
3050                 return -EAGAIN;
3051
3052         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3053                 nfs_restart_rpc(task, server->nfs_client);
3054                 return -EAGAIN;
3055         }
3056
3057         nfs_invalidate_atime(data->inode);
3058         if (task->tk_status > 0)
3059                 renew_lease(server, data->timestamp);
3060         return 0;
3061 }
3062
3063 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3064 {
3065         data->timestamp   = jiffies;
3066         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3067 }
3068
3069 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3070 {
3071         struct inode *inode = data->inode;
3072
3073         if (!nfs4_sequence_done(task, &data->res.seq_res))
3074                 return -EAGAIN;
3075
3076         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3077                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3078                 return -EAGAIN;
3079         }
3080         if (task->tk_status >= 0) {
3081                 renew_lease(NFS_SERVER(inode), data->timestamp);
3082                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3083         }
3084         return 0;
3085 }
3086
3087 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3088 {
3089         struct nfs_server *server = NFS_SERVER(data->inode);
3090
3091         data->args.bitmask = server->cache_consistency_bitmask;
3092         data->res.server = server;
3093         data->timestamp   = jiffies;
3094
3095         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3096 }
3097
3098 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3099 {
3100         struct inode *inode = data->inode;
3101
3102         if (!nfs4_sequence_done(task, &data->res.seq_res))
3103                 return -EAGAIN;
3104
3105         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3106                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3107                 return -EAGAIN;
3108         }
3109         nfs_refresh_inode(inode, data->res.fattr);
3110         return 0;
3111 }
3112
3113 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3114 {
3115         struct nfs_server *server = NFS_SERVER(data->inode);
3116
3117         data->args.bitmask = server->cache_consistency_bitmask;
3118         data->res.server = server;
3119         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3120 }
3121
3122 struct nfs4_renewdata {
3123         struct nfs_client       *client;
3124         unsigned long           timestamp;
3125 };
3126
3127 /*
3128  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3129  * standalone procedure for queueing an asynchronous RENEW.
3130  */
3131 static void nfs4_renew_release(void *calldata)
3132 {
3133         struct nfs4_renewdata *data = calldata;
3134         struct nfs_client *clp = data->client;
3135
3136         if (atomic_read(&clp->cl_count) > 1)
3137                 nfs4_schedule_state_renewal(clp);
3138         nfs_put_client(clp);
3139         kfree(data);
3140 }
3141
3142 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3143 {
3144         struct nfs4_renewdata *data = calldata;
3145         struct nfs_client *clp = data->client;
3146         unsigned long timestamp = data->timestamp;
3147
3148         if (task->tk_status < 0) {
3149                 /* Unless we're shutting down, schedule state recovery! */
3150                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3151                         nfs4_schedule_state_recovery(clp);
3152                 return;
3153         }
3154         do_renew_lease(clp, timestamp);
3155 }
3156
3157 static const struct rpc_call_ops nfs4_renew_ops = {
3158         .rpc_call_done = nfs4_renew_done,
3159         .rpc_release = nfs4_renew_release,
3160 };
3161
3162 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3163 {
3164         struct rpc_message msg = {
3165                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3166                 .rpc_argp       = clp,
3167                 .rpc_cred       = cred,
3168         };
3169         struct nfs4_renewdata *data;
3170
3171         if (!atomic_inc_not_zero(&clp->cl_count))
3172                 return -EIO;
3173         data = kmalloc(sizeof(*data), GFP_KERNEL);
3174         if (data == NULL)
3175                 return -ENOMEM;
3176         data->client = clp;
3177         data->timestamp = jiffies;
3178         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3179                         &nfs4_renew_ops, data);
3180 }
3181
3182 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3183 {
3184         struct rpc_message msg = {
3185                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3186                 .rpc_argp       = clp,
3187                 .rpc_cred       = cred,
3188         };
3189         unsigned long now = jiffies;
3190         int status;
3191
3192         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3193         if (status < 0)
3194                 return status;
3195         do_renew_lease(clp, now);
3196         return 0;
3197 }
3198
3199 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3200 {
3201         return (server->caps & NFS_CAP_ACLS)
3202                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3203                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3204 }
3205
3206 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3207  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3208  * the stack.
3209  */
3210 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3211
3212 static void buf_to_pages(const void *buf, size_t buflen,
3213                 struct page **pages, unsigned int *pgbase)
3214 {
3215         const void *p = buf;
3216
3217         *pgbase = offset_in_page(buf);
3218         p -= *pgbase;
3219         while (p < buf + buflen) {
3220                 *(pages++) = virt_to_page(p);
3221                 p += PAGE_CACHE_SIZE;
3222         }
3223 }
3224
3225 struct nfs4_cached_acl {
3226         int cached;
3227         size_t len;
3228         char data[0];
3229 };
3230
3231 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3232 {
3233         struct nfs_inode *nfsi = NFS_I(inode);
3234
3235         spin_lock(&inode->i_lock);
3236         kfree(nfsi->nfs4_acl);
3237         nfsi->nfs4_acl = acl;
3238         spin_unlock(&inode->i_lock);
3239 }
3240
3241 static void nfs4_zap_acl_attr(struct inode *inode)
3242 {
3243         nfs4_set_cached_acl(inode, NULL);
3244 }
3245
3246 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3247 {
3248         struct nfs_inode *nfsi = NFS_I(inode);
3249         struct nfs4_cached_acl *acl;
3250         int ret = -ENOENT;
3251
3252         spin_lock(&inode->i_lock);
3253         acl = nfsi->nfs4_acl;
3254         if (acl == NULL)
3255                 goto out;
3256         if (buf == NULL) /* user is just asking for length */
3257                 goto out_len;
3258         if (acl->cached == 0)
3259                 goto out;
3260         ret = -ERANGE; /* see getxattr(2) man page */
3261         if (acl->len > buflen)
3262                 goto out;
3263         memcpy(buf, acl->data, acl->len);
3264 out_len:
3265         ret = acl->len;
3266 out:
3267         spin_unlock(&inode->i_lock);
3268         return ret;
3269 }
3270
3271 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3272 {
3273         struct nfs4_cached_acl *acl;
3274
3275         if (buf && acl_len <= PAGE_SIZE) {
3276                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3277                 if (acl == NULL)
3278                         goto out;
3279                 acl->cached = 1;
3280                 memcpy(acl->data, buf, acl_len);
3281         } else {
3282                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3283                 if (acl == NULL)
3284                         goto out;
3285                 acl->cached = 0;
3286         }
3287         acl->len = acl_len;
3288 out:
3289         nfs4_set_cached_acl(inode, acl);
3290 }
3291
3292 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3293 {
3294         struct page *pages[NFS4ACL_MAXPAGES];
3295         struct nfs_getaclargs args = {
3296                 .fh = NFS_FH(inode),
3297                 .acl_pages = pages,
3298                 .acl_len = buflen,
3299         };
3300         struct nfs_getaclres res = {
3301                 .acl_len = buflen,
3302         };
3303         void *resp_buf;
3304         struct rpc_message msg = {
3305                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3306                 .rpc_argp = &args,
3307                 .rpc_resp = &res,
3308         };
3309         struct page *localpage = NULL;
3310         int ret;
3311
3312         if (buflen < PAGE_SIZE) {
3313                 /* As long as we're doing a round trip to the server anyway,
3314                  * let's be prepared for a page of acl data. */
3315                 localpage = alloc_page(GFP_KERNEL);
3316                 resp_buf = page_address(localpage);
3317                 if (localpage == NULL)
3318                         return -ENOMEM;
3319                 args.acl_pages[0] = localpage;
3320                 args.acl_pgbase = 0;
3321                 args.acl_len = PAGE_SIZE;
3322         } else {
3323                 resp_buf = buf;
3324                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3325         }
3326         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3327         if (ret)
3328                 goto out_free;
3329         if (res.acl_len > args.acl_len)
3330                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3331         else
3332                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3333         if (buf) {
3334                 ret = -ERANGE;
3335                 if (res.acl_len > buflen)
3336                         goto out_free;
3337                 if (localpage)
3338                         memcpy(buf, resp_buf, res.acl_len);
3339         }
3340         ret = res.acl_len;
3341 out_free:
3342         if (localpage)
3343                 __free_page(localpage);
3344         return ret;
3345 }
3346
3347 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3348 {
3349         struct nfs4_exception exception = { };
3350         ssize_t ret;
3351         do {
3352                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3353                 if (ret >= 0)
3354                         break;
3355                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3356         } while (exception.retry);
3357         return ret;
3358 }
3359
3360 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3361 {
3362         struct nfs_server *server = NFS_SERVER(inode);
3363         int ret;
3364
3365         if (!nfs4_server_supports_acls(server))
3366                 return -EOPNOTSUPP;
3367         ret = nfs_revalidate_inode(server, inode);
3368         if (ret < 0)
3369                 return ret;
3370         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3371                 nfs_zap_acl_cache(inode);
3372         ret = nfs4_read_cached_acl(inode, buf, buflen);
3373         if (ret != -ENOENT)
3374                 return ret;
3375         return nfs4_get_acl_uncached(inode, buf, buflen);
3376 }
3377
3378 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3379 {
3380         struct nfs_server *server = NFS_SERVER(inode);
3381         struct page *pages[NFS4ACL_MAXPAGES];
3382         struct nfs_setaclargs arg = {
3383                 .fh             = NFS_FH(inode),
3384                 .acl_pages      = pages,
3385                 .acl_len        = buflen,
3386         };
3387         struct nfs_setaclres res;
3388         struct rpc_message msg = {
3389                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3390                 .rpc_argp       = &arg,
3391                 .rpc_resp       = &res,
3392         };
3393         int ret;
3394
3395         if (!nfs4_server_supports_acls(server))
3396                 return -EOPNOTSUPP;
3397         nfs_inode_return_delegation(inode);
3398         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3399         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3400         /*
3401          * Acl update can result in inode attribute update.
3402          * so mark the attribute cache invalid.
3403          */
3404         spin_lock(&inode->i_lock);
3405         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3406         spin_unlock(&inode->i_lock);
3407         nfs_access_zap_cache(inode);
3408         nfs_zap_acl_cache(inode);
3409         return ret;
3410 }
3411
3412 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3413 {
3414         struct nfs4_exception exception = { };
3415         int err;
3416         do {
3417                 err = nfs4_handle_exception(NFS_SERVER(inode),
3418                                 __nfs4_proc_set_acl(inode, buf, buflen),
3419                                 &exception);
3420         } while (exception.retry);
3421         return err;
3422 }
3423
3424 static int
3425 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3426 {
3427         struct nfs_client *clp = server->nfs_client;
3428
3429         if (task->tk_status >= 0)
3430                 return 0;
3431         switch(task->tk_status) {
3432                 case -NFS4ERR_ADMIN_REVOKED:
3433                 case -NFS4ERR_BAD_STATEID:
3434                 case -NFS4ERR_OPENMODE:
3435                         if (state == NULL)
3436                                 break;
3437                         nfs4_state_mark_reclaim_nograce(clp, state);
3438                         goto do_state_recovery;
3439                 case -NFS4ERR_STALE_STATEID:
3440                 case -NFS4ERR_STALE_CLIENTID:
3441                 case -NFS4ERR_EXPIRED:
3442                         goto do_state_recovery;
3443 #if defined(CONFIG_NFS_V4_1)
3444                 case -NFS4ERR_BADSESSION:
3445                 case -NFS4ERR_BADSLOT:
3446                 case -NFS4ERR_BAD_HIGH_SLOT:
3447                 case -NFS4ERR_DEADSESSION:
3448                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3449                 case -NFS4ERR_SEQ_FALSE_RETRY:
3450                 case -NFS4ERR_SEQ_MISORDERED:
3451                         dprintk("%s ERROR %d, Reset session\n", __func__,
3452                                 task->tk_status);
3453                         nfs4_schedule_state_recovery(clp);
3454                         task->tk_status = 0;
3455                         return -EAGAIN;
3456 #endif /* CONFIG_NFS_V4_1 */
3457                 case -NFS4ERR_DELAY:
3458                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3459                 case -NFS4ERR_GRACE:
3460                 case -EKEYEXPIRED:
3461                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3462                         task->tk_status = 0;
3463                         return -EAGAIN;
3464                 case -NFS4ERR_OLD_STATEID:
3465                         task->tk_status = 0;
3466                         return -EAGAIN;
3467         }
3468         task->tk_status = nfs4_map_errors(task->tk_status);
3469         return 0;
3470 do_state_recovery:
3471         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3472         nfs4_schedule_state_recovery(clp);
3473         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3474                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3475         task->tk_status = 0;
3476         return -EAGAIN;
3477 }
3478
3479 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3480                 unsigned short port, struct rpc_cred *cred,
3481                 struct nfs4_setclientid_res *res)
3482 {
3483         nfs4_verifier sc_verifier;
3484         struct nfs4_setclientid setclientid = {
3485                 .sc_verifier = &sc_verifier,
3486                 .sc_prog = program,
3487         };
3488         struct rpc_message msg = {
3489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3490                 .rpc_argp = &setclientid,
3491                 .rpc_resp = res,
3492                 .rpc_cred = cred,
3493         };
3494         __be32 *p;
3495         int loop = 0;
3496         int status;
3497
3498         p = (__be32*)sc_verifier.data;
3499         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3500         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3501
3502         for(;;) {
3503                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3504                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3505                                 clp->cl_ipaddr,
3506                                 rpc_peeraddr2str(clp->cl_rpcclient,
3507                                                         RPC_DISPLAY_ADDR),
3508                                 rpc_peeraddr2str(clp->cl_rpcclient,
3509                                                         RPC_DISPLAY_PROTO),
3510                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3511                                 clp->cl_id_uniquifier);
3512                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3513                                 sizeof(setclientid.sc_netid),
3514                                 rpc_peeraddr2str(clp->cl_rpcclient,
3515                                                         RPC_DISPLAY_NETID));
3516                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3517                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3518                                 clp->cl_ipaddr, port >> 8, port & 255);
3519
3520                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3521                 if (status != -NFS4ERR_CLID_INUSE)
3522                         break;
3523                 if (signalled())
3524                         break;
3525                 if (loop++ & 1)
3526                         ssleep(clp->cl_lease_time / HZ + 1);
3527                 else
3528                         if (++clp->cl_id_uniquifier == 0)
3529                                 break;
3530         }
3531         return status;
3532 }
3533
3534 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3535                 struct nfs4_setclientid_res *arg,
3536                 struct rpc_cred *cred)
3537 {
3538         struct nfs_fsinfo fsinfo;
3539         struct rpc_message msg = {
3540                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3541                 .rpc_argp = arg,
3542                 .rpc_resp = &fsinfo,
3543                 .rpc_cred = cred,
3544         };
3545         unsigned long now;
3546         int status;
3547
3548         now = jiffies;
3549         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3550         if (status == 0) {
3551                 spin_lock(&clp->cl_lock);
3552                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3553                 clp->cl_last_renewal = now;
3554                 spin_unlock(&clp->cl_lock);
3555         }
3556         return status;
3557 }
3558
3559 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3560                 struct nfs4_setclientid_res *arg,
3561                 struct rpc_cred *cred)
3562 {
3563         long timeout = 0;
3564         int err;
3565         do {
3566                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3567                 switch (err) {
3568                         case 0:
3569                                 return err;
3570                         case -NFS4ERR_RESOURCE:
3571                                 /* The IBM lawyers misread another document! */
3572                         case -NFS4ERR_DELAY:
3573                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3574                 }
3575         } while (err == 0);
3576         return err;
3577 }
3578
3579 struct nfs4_delegreturndata {
3580         struct nfs4_delegreturnargs args;
3581         struct nfs4_delegreturnres res;
3582         struct nfs_fh fh;
3583         nfs4_stateid stateid;
3584         unsigned long timestamp;
3585         struct nfs_fattr fattr;
3586         int rpc_status;
3587 };
3588
3589 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3590 {
3591         struct nfs4_delegreturndata *data = calldata;
3592
3593         if (!nfs4_sequence_done(task, &data->res.seq_res))
3594                 return;
3595
3596         switch (task->tk_status) {
3597         case -NFS4ERR_STALE_STATEID:
3598         case -NFS4ERR_EXPIRED:
3599         case 0:
3600                 renew_lease(data->res.server, data->timestamp);
3601                 break;
3602         default:
3603                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3604                                 -EAGAIN) {
3605                         nfs_restart_rpc(task, data->res.server->nfs_client);
3606                         return;
3607                 }
3608         }
3609         data->rpc_status = task->tk_status;
3610 }
3611
3612 static void nfs4_delegreturn_release(void *calldata)
3613 {
3614         kfree(calldata);
3615 }
3616
3617 #if defined(CONFIG_NFS_V4_1)
3618 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3619 {
3620         struct nfs4_delegreturndata *d_data;
3621
3622         d_data = (struct nfs4_delegreturndata *)data;
3623
3624         if (nfs4_setup_sequence(d_data->res.server,
3625                                 &d_data->args.seq_args,
3626                                 &d_data->res.seq_res, 1, task))
3627                 return;
3628         rpc_call_start(task);
3629 }
3630 #endif /* CONFIG_NFS_V4_1 */
3631
3632 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3633 #if defined(CONFIG_NFS_V4_1)
3634         .rpc_call_prepare = nfs4_delegreturn_prepare,
3635 #endif /* CONFIG_NFS_V4_1 */
3636         .rpc_call_done = nfs4_delegreturn_done,
3637         .rpc_release = nfs4_delegreturn_release,
3638 };
3639
3640 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3641 {
3642         struct nfs4_delegreturndata *data;
3643         struct nfs_server *server = NFS_SERVER(inode);
3644         struct rpc_task *task;
3645         struct rpc_message msg = {
3646                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3647                 .rpc_cred = cred,
3648         };
3649         struct rpc_task_setup task_setup_data = {
3650                 .rpc_client = server->client,
3651                 .rpc_message = &msg,
3652                 .callback_ops = &nfs4_delegreturn_ops,
3653                 .flags = RPC_TASK_ASYNC,
3654         };
3655         int status = 0;
3656
3657         data = kzalloc(sizeof(*data), GFP_NOFS);
3658         if (data == NULL)
3659                 return -ENOMEM;
3660         data->args.fhandle = &data->fh;
3661         data->args.stateid = &data->stateid;
3662         data->args.bitmask = server->attr_bitmask;
3663         nfs_copy_fh(&data->fh, NFS_FH(inode));
3664         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3665         data->res.fattr = &data->fattr;
3666         data->res.server = server;
3667         nfs_fattr_init(data->res.fattr);
3668         data->timestamp = jiffies;
3669         data->rpc_status = 0;
3670
3671         task_setup_data.callback_data = data;
3672         msg.rpc_argp = &data->args;
3673         msg.rpc_resp = &data->res;
3674         task = rpc_run_task(&task_setup_data);
3675         if (IS_ERR(task))
3676                 return PTR_ERR(task);
3677         if (!issync)
3678                 goto out;
3679         status = nfs4_wait_for_completion_rpc_task(task);
3680         if (status != 0)
3681                 goto out;
3682         status = data->rpc_status;
3683         if (status != 0)
3684                 goto out;
3685         nfs_refresh_inode(inode, &data->fattr);
3686 out:
3687         rpc_put_task(task);
3688         return status;
3689 }
3690
3691 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3692 {
3693         struct nfs_server *server = NFS_SERVER(inode);
3694         struct nfs4_exception exception = { };
3695         int err;
3696         do {
3697                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3698                 switch (err) {
3699                         case -NFS4ERR_STALE_STATEID:
3700                         case -NFS4ERR_EXPIRED:
3701                         case 0:
3702                                 return 0;
3703                 }
3704                 err = nfs4_handle_exception(server, err, &exception);
3705         } while (exception.retry);
3706         return err;
3707 }
3708
3709 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3710 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3711
3712 /*
3713  * sleep, with exponential backoff, and retry the LOCK operation.
3714  */
3715 static unsigned long
3716 nfs4_set_lock_task_retry(unsigned long timeout)
3717 {
3718         schedule_timeout_killable(timeout);
3719         timeout <<= 1;
3720         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3721                 return NFS4_LOCK_MAXTIMEOUT;
3722         return timeout;
3723 }
3724
3725 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3726 {
3727         struct inode *inode = state->inode;
3728         struct nfs_server *server = NFS_SERVER(inode);
3729         struct nfs_client *clp = server->nfs_client;
3730         struct nfs_lockt_args arg = {
3731                 .fh = NFS_FH(inode),
3732                 .fl = request,
3733         };
3734         struct nfs_lockt_res res = {
3735                 .denied = request,
3736         };
3737         struct rpc_message msg = {
3738                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3739                 .rpc_argp       = &arg,
3740                 .rpc_resp       = &res,
3741                 .rpc_cred       = state->owner->so_cred,
3742         };
3743         struct nfs4_lock_state *lsp;
3744         int status;
3745
3746         arg.lock_owner.clientid = clp->cl_clientid;
3747         status = nfs4_set_lock_state(state, request);
3748         if (status != 0)
3749                 goto out;
3750         lsp = request->fl_u.nfs4_fl.owner;
3751         arg.lock_owner.id = lsp->ls_id.id;
3752         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3753         switch (status) {
3754                 case 0:
3755                         request->fl_type = F_UNLCK;
3756                         break;
3757                 case -NFS4ERR_DENIED:
3758                         status = 0;
3759         }
3760         request->fl_ops->fl_release_private(request);
3761 out:
3762         return status;
3763 }
3764
3765 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3766 {
3767         struct nfs4_exception exception = { };
3768         int err;
3769
3770         do {
3771                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3772                                 _nfs4_proc_getlk(state, cmd, request),
3773                                 &exception);
3774         } while (exception.retry);
3775         return err;
3776 }
3777
3778 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3779 {
3780         int res = 0;
3781         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3782                 case FL_POSIX:
3783                         res = posix_lock_file_wait(file, fl);
3784                         break;
3785                 case FL_FLOCK:
3786                         res = flock_lock_file_wait(file, fl);
3787                         break;
3788                 default:
3789                         BUG();
3790         }
3791         return res;
3792 }
3793
3794 struct nfs4_unlockdata {
3795         struct nfs_locku_args arg;
3796         struct nfs_locku_res res;
3797         struct nfs4_lock_state *lsp;
3798         struct nfs_open_context *ctx;
3799         struct file_lock fl;
3800         const struct nfs_server *server;
3801         unsigned long timestamp;
3802 };
3803
3804 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3805                 struct nfs_open_context *ctx,
3806                 struct nfs4_lock_state *lsp,
3807                 struct nfs_seqid *seqid)
3808 {
3809         struct nfs4_unlockdata *p;
3810         struct inode *inode = lsp->ls_state->inode;
3811
3812         p = kzalloc(sizeof(*p), GFP_NOFS);
3813         if (p == NULL)
3814                 return NULL;
3815         p->arg.fh = NFS_FH(inode);
3816         p->arg.fl = &p->fl;
3817         p->arg.seqid = seqid;
3818         p->res.seqid = seqid;
3819         p->arg.stateid = &lsp->ls_stateid;
3820         p->lsp = lsp;
3821         atomic_inc(&lsp->ls_count);
3822         /* Ensure we don't close file until we're done freeing locks! */
3823         p->ctx = get_nfs_open_context(ctx);
3824         memcpy(&p->fl, fl, sizeof(p->fl));
3825         p->server = NFS_SERVER(inode);
3826         return p;
3827 }
3828
3829 static void nfs4_locku_release_calldata(void *data)
3830 {
3831         struct nfs4_unlockdata *calldata = data;
3832         nfs_free_seqid(calldata->arg.seqid);
3833         nfs4_put_lock_state(calldata->lsp);
3834         put_nfs_open_context(calldata->ctx);
3835         kfree(calldata);
3836 }
3837
3838 static void nfs4_locku_done(struct rpc_task *task, void *data)
3839 {
3840         struct nfs4_unlockdata *calldata = data;
3841
3842         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3843                 return;
3844         switch (task->tk_status) {
3845                 case 0:
3846                         memcpy(calldata->lsp->ls_stateid.data,
3847                                         calldata->res.stateid.data,
3848                                         sizeof(calldata->lsp->ls_stateid.data));
3849                         renew_lease(calldata->server, calldata->timestamp);
3850                         break;
3851                 case -NFS4ERR_BAD_STATEID:
3852                 case -NFS4ERR_OLD_STATEID:
3853                 case -NFS4ERR_STALE_STATEID:
3854                 case -NFS4ERR_EXPIRED:
3855                         break;
3856                 default:
3857                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3858                                 nfs_restart_rpc(task,
3859                                                  calldata->server->nfs_client);
3860         }
3861 }
3862
3863 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3864 {
3865         struct nfs4_unlockdata *calldata = data;
3866
3867         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3868                 return;
3869         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3870                 /* Note: exit _without_ running nfs4_locku_done */
3871                 task->tk_action = NULL;
3872                 return;
3873         }
3874         calldata->timestamp = jiffies;
3875         if (nfs4_setup_sequence(calldata->server,
3876                                 &calldata->arg.seq_args,
3877                                 &calldata->res.seq_res, 1, task))
3878                 return;
3879         rpc_call_start(task);
3880 }
3881
3882 static const struct rpc_call_ops nfs4_locku_ops = {
3883         .rpc_call_prepare = nfs4_locku_prepare,
3884         .rpc_call_done = nfs4_locku_done,
3885         .rpc_release = nfs4_locku_release_calldata,
3886 };
3887
3888 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3889                 struct nfs_open_context *ctx,
3890                 struct nfs4_lock_state *lsp,
3891                 struct nfs_seqid *seqid)
3892 {
3893         struct nfs4_unlockdata *data;
3894         struct rpc_message msg = {
3895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3896                 .rpc_cred = ctx->cred,
3897         };
3898         struct rpc_task_setup task_setup_data = {
3899                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3900                 .rpc_message = &msg,
3901                 .callback_ops = &nfs4_locku_ops,
3902                 .workqueue = nfsiod_workqueue,
3903                 .flags = RPC_TASK_ASYNC,
3904         };
3905
3906         /* Ensure this is an unlock - when canceling a lock, the
3907          * canceled lock is passed in, and it won't be an unlock.
3908          */
3909         fl->fl_type = F_UNLCK;
3910
3911         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3912         if (data == NULL) {
3913                 nfs_free_seqid(seqid);
3914                 return ERR_PTR(-ENOMEM);
3915         }
3916
3917         msg.rpc_argp = &data->arg;
3918         msg.rpc_resp = &data->res;
3919         task_setup_data.callback_data = data;
3920         return rpc_run_task(&task_setup_data);
3921 }
3922
3923 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3924 {
3925         struct nfs_inode *nfsi = NFS_I(state->inode);
3926         struct nfs_seqid *seqid;
3927         struct nfs4_lock_state *lsp;
3928         struct rpc_task *task;
3929         int status = 0;
3930         unsigned char fl_flags = request->fl_flags;
3931
3932         status = nfs4_set_lock_state(state, request);
3933         /* Unlock _before_ we do the RPC call */
3934         request->fl_flags |= FL_EXISTS;
3935         down_read(&nfsi->rwsem);
3936         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3937                 up_read(&nfsi->rwsem);
3938                 goto out;
3939         }
3940         up_read(&nfsi->rwsem);
3941         if (status != 0)
3942                 goto out;
3943         /* Is this a delegated lock? */
3944         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3945                 goto out;
3946         lsp = request->fl_u.nfs4_fl.owner;
3947         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3948         status = -ENOMEM;
3949         if (seqid == NULL)
3950                 goto out;
3951         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3952         status = PTR_ERR(task);
3953         if (IS_ERR(task))
3954                 goto out;
3955         status = nfs4_wait_for_completion_rpc_task(task);
3956         rpc_put_task(task);
3957 out:
3958         request->fl_flags = fl_flags;
3959         return status;
3960 }
3961
3962 struct nfs4_lockdata {
3963         struct nfs_lock_args arg;
3964         struct nfs_lock_res res;
3965         struct nfs4_lock_state *lsp;
3966         struct nfs_open_context *ctx;
3967         struct file_lock fl;
3968         unsigned long timestamp;
3969         int rpc_status;
3970         int cancelled;
3971         struct nfs_server *server;
3972 };
3973
3974 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3975                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
3976                 gfp_t gfp_mask)
3977 {
3978         struct nfs4_lockdata *p;
3979         struct inode *inode = lsp->ls_state->inode;
3980         struct nfs_server *server = NFS_SERVER(inode);
3981
3982         p = kzalloc(sizeof(*p), gfp_mask);
3983         if (p == NULL)
3984                 return NULL;
3985
3986         p->arg.fh = NFS_FH(inode);
3987         p->arg.fl = &p->fl;
3988         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
3989         if (p->arg.open_seqid == NULL)
3990                 goto out_free;
3991         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
3992         if (p->arg.lock_seqid == NULL)
3993                 goto out_free_seqid;
3994         p->arg.lock_stateid = &lsp->ls_stateid;
3995         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3996         p->arg.lock_owner.id = lsp->ls_id.id;
3997         p->res.lock_seqid = p->arg.lock_seqid;
3998         p->lsp = lsp;
3999         p->server = server;
4000         atomic_inc(&lsp->ls_count);
4001         p->ctx = get_nfs_open_context(ctx);
4002         memcpy(&p->fl, fl, sizeof(p->fl));
4003         return p;
4004 out_free_seqid:
4005         nfs_free_seqid(p->arg.open_seqid);
4006 out_free:
4007         kfree(p);
4008         return NULL;
4009 }
4010
4011 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4012 {
4013         struct nfs4_lockdata *data = calldata;
4014         struct nfs4_state *state = data->lsp->ls_state;
4015
4016         dprintk("%s: begin!\n", __func__);
4017         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4018                 return;
4019         /* Do we need to do an open_to_lock_owner? */
4020         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4021                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4022                         return;
4023                 data->arg.open_stateid = &state->stateid;
4024                 data->arg.new_lock_owner = 1;
4025                 data->res.open_seqid = data->arg.open_seqid;
4026         } else
4027                 data->arg.new_lock_owner = 0;
4028         data->timestamp = jiffies;
4029         if (nfs4_setup_sequence(data->server,
4030                                 &data->arg.seq_args,
4031                                 &data->res.seq_res, 1, task))
4032                 return;
4033         rpc_call_start(task);
4034         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4035 }
4036
4037 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4038 {
4039         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4040         nfs4_lock_prepare(task, calldata);
4041 }
4042
4043 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4044 {
4045         struct nfs4_lockdata *data = calldata;
4046
4047         dprintk("%s: begin!\n", __func__);
4048
4049         if (!nfs4_sequence_done(task, &data->res.seq_res))
4050                 return;
4051
4052         data->rpc_status = task->tk_status;
4053         if (data->arg.new_lock_owner != 0) {
4054                 if (data->rpc_status == 0)
4055                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4056                 else
4057                         goto out;
4058         }
4059         if (data->rpc_status == 0) {
4060                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4061                                         sizeof(data->lsp->ls_stateid.data));
4062                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4063                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4064         }
4065 out:
4066         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4067 }
4068
4069 static void nfs4_lock_release(void *calldata)
4070 {
4071         struct nfs4_lockdata *data = calldata;
4072
4073         dprintk("%s: begin!\n", __func__);
4074         nfs_free_seqid(data->arg.open_seqid);
4075         if (data->cancelled != 0) {
4076                 struct rpc_task *task;
4077                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4078                                 data->arg.lock_seqid);
4079                 if (!IS_ERR(task))
4080                         rpc_put_task(task);
4081                 dprintk("%s: cancelling lock!\n", __func__);
4082         } else
4083                 nfs_free_seqid(data->arg.lock_seqid);
4084         nfs4_put_lock_state(data->lsp);
4085         put_nfs_open_context(data->ctx);
4086         kfree(data);
4087         dprintk("%s: done!\n", __func__);
4088 }
4089
4090 static const struct rpc_call_ops nfs4_lock_ops = {
4091         .rpc_call_prepare = nfs4_lock_prepare,
4092         .rpc_call_done = nfs4_lock_done,
4093         .rpc_release = nfs4_lock_release,
4094 };
4095
4096 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4097         .rpc_call_prepare = nfs4_recover_lock_prepare,
4098         .rpc_call_done = nfs4_lock_done,
4099         .rpc_release = nfs4_lock_release,
4100 };
4101
4102 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4103 {
4104         struct nfs_client *clp = server->nfs_client;
4105         struct nfs4_state *state = lsp->ls_state;
4106
4107         switch (error) {
4108         case -NFS4ERR_ADMIN_REVOKED:
4109         case -NFS4ERR_BAD_STATEID:
4110         case -NFS4ERR_EXPIRED:
4111                 if (new_lock_owner != 0 ||
4112                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4113                         nfs4_state_mark_reclaim_nograce(clp, state);
4114                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4115                 break;
4116         case -NFS4ERR_STALE_STATEID:
4117                 if (new_lock_owner != 0 ||
4118                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4119                         nfs4_state_mark_reclaim_reboot(clp, state);
4120                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4121         };
4122 }
4123
4124 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4125 {
4126         struct nfs4_lockdata *data;
4127         struct rpc_task *task;
4128         struct rpc_message msg = {
4129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4130                 .rpc_cred = state->owner->so_cred,
4131         };
4132         struct rpc_task_setup task_setup_data = {
4133                 .rpc_client = NFS_CLIENT(state->inode),
4134                 .rpc_message = &msg,
4135                 .callback_ops = &nfs4_lock_ops,
4136                 .workqueue = nfsiod_workqueue,
4137                 .flags = RPC_TASK_ASYNC,
4138         };
4139         int ret;
4140
4141         dprintk("%s: begin!\n", __func__);
4142         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4143                         fl->fl_u.nfs4_fl.owner,
4144                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4145         if (data == NULL)
4146                 return -ENOMEM;
4147         if (IS_SETLKW(cmd))
4148                 data->arg.block = 1;
4149         if (recovery_type > NFS_LOCK_NEW) {
4150                 if (recovery_type == NFS_LOCK_RECLAIM)
4151                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4152                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4153         }
4154         msg.rpc_argp = &data->arg;
4155         msg.rpc_resp = &data->res;
4156         task_setup_data.callback_data = data;
4157         task = rpc_run_task(&task_setup_data);
4158         if (IS_ERR(task))
4159                 return PTR_ERR(task);
4160         ret = nfs4_wait_for_completion_rpc_task(task);
4161         if (ret == 0) {
4162                 ret = data->rpc_status;
4163                 if (ret)
4164                         nfs4_handle_setlk_error(data->server, data->lsp,
4165                                         data->arg.new_lock_owner, ret);
4166         } else
4167                 data->cancelled = 1;
4168         rpc_put_task(task);
4169         dprintk("%s: done, ret = %d!\n", __func__, ret);
4170         return ret;
4171 }
4172
4173 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4174 {
4175         struct nfs_server *server = NFS_SERVER(state->inode);
4176         struct nfs4_exception exception = { };
4177         int err;
4178
4179         do {
4180                 /* Cache the lock if possible... */
4181                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4182                         return 0;
4183                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4184                 if (err != -NFS4ERR_DELAY)
4185                         break;
4186                 nfs4_handle_exception(server, err, &exception);
4187         } while (exception.retry);
4188         return err;
4189 }
4190
4191 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4192 {
4193         struct nfs_server *server = NFS_SERVER(state->inode);
4194         struct nfs4_exception exception = { };
4195         int err;
4196
4197         err = nfs4_set_lock_state(state, request);
4198         if (err != 0)
4199                 return err;
4200         do {
4201                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4202                         return 0;
4203                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4204                 switch (err) {
4205                 default:
4206                         goto out;
4207                 case -NFS4ERR_GRACE:
4208                 case -NFS4ERR_DELAY:
4209                         nfs4_handle_exception(server, err, &exception);
4210                         err = 0;
4211                 }
4212         } while (exception.retry);
4213 out:
4214         return err;
4215 }
4216
4217 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4218 {
4219         struct nfs_inode *nfsi = NFS_I(state->inode);
4220         unsigned char fl_flags = request->fl_flags;
4221         int status = -ENOLCK;
4222
4223         if ((fl_flags & FL_POSIX) &&
4224                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4225                 goto out;
4226         /* Is this a delegated open? */
4227         status = nfs4_set_lock_state(state, request);
4228         if (status != 0)
4229                 goto out;
4230         request->fl_flags |= FL_ACCESS;
4231         status = do_vfs_lock(request->fl_file, request);
4232         if (status < 0)
4233                 goto out;
4234         down_read(&nfsi->rwsem);
4235         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4236                 /* Yes: cache locks! */
4237                 /* ...but avoid races with delegation recall... */
4238                 request->fl_flags = fl_flags & ~FL_SLEEP;
4239                 status = do_vfs_lock(request->fl_file, request);
4240                 goto out_unlock;
4241         }
4242         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4243         if (status != 0)
4244                 goto out_unlock;
4245         /* Note: we always want to sleep here! */
4246         request->fl_flags = fl_flags | FL_SLEEP;
4247         if (do_vfs_lock(request->fl_file, request) < 0)
4248                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4249 out_unlock:
4250         up_read(&nfsi->rwsem);
4251 out:
4252         request->fl_flags = fl_flags;
4253         return status;
4254 }
4255
4256 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4257 {
4258         struct nfs4_exception exception = { };
4259         int err;
4260
4261         do {
4262                 err = _nfs4_proc_setlk(state, cmd, request);
4263                 if (err == -NFS4ERR_DENIED)
4264                         err = -EAGAIN;
4265                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4266                                 err, &exception);
4267         } while (exception.retry);
4268         return err;
4269 }
4270
4271 static int
4272 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4273 {
4274         struct nfs_open_context *ctx;
4275         struct nfs4_state *state;
4276         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4277         int status;
4278
4279         /* verify open state */
4280         ctx = nfs_file_open_context(filp);
4281         state = ctx->state;
4282
4283         if (request->fl_start < 0 || request->fl_end < 0)
4284                 return -EINVAL;
4285
4286         if (IS_GETLK(cmd)) {
4287                 if (state != NULL)
4288                         return nfs4_proc_getlk(state, F_GETLK, request);
4289                 return 0;
4290         }
4291
4292         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4293                 return -EINVAL;
4294
4295         if (request->fl_type == F_UNLCK) {
4296                 if (state != NULL)
4297                         return nfs4_proc_unlck(state, cmd, request);
4298                 return 0;
4299         }
4300
4301         if (state == NULL)
4302                 return -ENOLCK;
4303         do {
4304                 status = nfs4_proc_setlk(state, cmd, request);
4305                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4306                         break;
4307                 timeout = nfs4_set_lock_task_retry(timeout);
4308                 status = -ERESTARTSYS;
4309                 if (signalled())
4310                         break;
4311         } while(status < 0);
4312         return status;
4313 }
4314
4315 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4316 {
4317         struct nfs_server *server = NFS_SERVER(state->inode);
4318         struct nfs4_exception exception = { };
4319         int err;
4320
4321         err = nfs4_set_lock_state(state, fl);
4322         if (err != 0)
4323                 goto out;
4324         do {
4325                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4326                 switch (err) {
4327                         default:
4328                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4329                                                 __func__, err);
4330                         case 0:
4331                         case -ESTALE:
4332                                 goto out;
4333                         case -NFS4ERR_EXPIRED:
4334                         case -NFS4ERR_STALE_CLIENTID:
4335                         case -NFS4ERR_STALE_STATEID:
4336                         case -NFS4ERR_BADSESSION:
4337                         case -NFS4ERR_BADSLOT:
4338                         case -NFS4ERR_BAD_HIGH_SLOT:
4339                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4340                         case -NFS4ERR_DEADSESSION:
4341                                 nfs4_schedule_state_recovery(server->nfs_client);
4342                                 goto out;
4343                         case -ERESTARTSYS:
4344                                 /*
4345                                  * The show must go on: exit, but mark the
4346                                  * stateid as needing recovery.
4347                                  */
4348                         case -NFS4ERR_ADMIN_REVOKED:
4349                         case -NFS4ERR_BAD_STATEID:
4350                         case -NFS4ERR_OPENMODE:
4351                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4352                                 err = 0;
4353                                 goto out;
4354                         case -EKEYEXPIRED:
4355                                 /*
4356                                  * User RPCSEC_GSS context has expired.
4357                                  * We cannot recover this stateid now, so
4358                                  * skip it and allow recovery thread to
4359                                  * proceed.
4360                                  */
4361                                 err = 0;
4362                                 goto out;
4363                         case -ENOMEM:
4364                         case -NFS4ERR_DENIED:
4365                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4366                                 err = 0;
4367                                 goto out;
4368                         case -NFS4ERR_DELAY:
4369                                 break;
4370                 }
4371                 err = nfs4_handle_exception(server, err, &exception);
4372         } while (exception.retry);
4373 out:
4374         return err;
4375 }
4376
4377 static void nfs4_release_lockowner_release(void *calldata)
4378 {
4379         kfree(calldata);
4380 }
4381
4382 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4383         .rpc_release = nfs4_release_lockowner_release,
4384 };
4385
4386 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4387 {
4388         struct nfs_server *server = lsp->ls_state->owner->so_server;
4389         struct nfs_release_lockowner_args *args;
4390         struct rpc_message msg = {
4391                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4392         };
4393
4394         if (server->nfs_client->cl_mvops->minor_version != 0)
4395                 return;
4396         args = kmalloc(sizeof(*args), GFP_NOFS);
4397         if (!args)
4398                 return;
4399         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4400         args->lock_owner.id = lsp->ls_id.id;
4401         msg.rpc_argp = args;
4402         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4403 }
4404
4405 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4406
4407 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4408                                    const void *buf, size_t buflen,
4409                                    int flags, int type)
4410 {
4411         if (strcmp(key, "") != 0)
4412                 return -EINVAL;
4413
4414         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4415 }
4416
4417 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4418                                    void *buf, size_t buflen, int type)
4419 {
4420         if (strcmp(key, "") != 0)
4421                 return -EINVAL;
4422
4423         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4424 }
4425
4426 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4427                                        size_t list_len, const char *name,
4428                                        size_t name_len, int type)
4429 {
4430         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4431
4432         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4433                 return 0;
4434
4435         if (list && len <= list_len)
4436                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4437         return len;
4438 }
4439
4440 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4441 {
4442         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4443                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4444                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4445                 return;
4446
4447         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4448                 NFS_ATTR_FATTR_NLINK;
4449         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4450         fattr->nlink = 2;
4451 }
4452
4453 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4454                 struct nfs4_fs_locations *fs_locations, struct page *page)
4455 {
4456         struct nfs_server *server = NFS_SERVER(dir);
4457         u32 bitmask[2] = {
4458                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4459                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4460         };
4461         struct nfs4_fs_locations_arg args = {
4462                 .dir_fh = NFS_FH(dir),
4463                 .name = name,
4464                 .page = page,
4465                 .bitmask = bitmask,
4466         };
4467         struct nfs4_fs_locations_res res = {
4468                 .fs_locations = fs_locations,
4469         };
4470         struct rpc_message msg = {
4471                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4472                 .rpc_argp = &args,
4473                 .rpc_resp = &res,
4474         };
4475         int status;
4476
4477         dprintk("%s: start\n", __func__);
4478         nfs_fattr_init(&fs_locations->fattr);
4479         fs_locations->server = server;
4480         fs_locations->nlocations = 0;
4481         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4482         nfs_fixup_referral_attributes(&fs_locations->fattr);
4483         dprintk("%s: returned status = %d\n", __func__, status);
4484         return status;
4485 }
4486
4487 #ifdef CONFIG_NFS_V4_1
4488 /*
4489  * nfs4_proc_exchange_id()
4490  *
4491  * Since the clientid has expired, all compounds using sessions
4492  * associated with the stale clientid will be returning
4493  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4494  * be in some phase of session reset.
4495  */
4496 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4497 {
4498         nfs4_verifier verifier;
4499         struct nfs41_exchange_id_args args = {
4500                 .client = clp,
4501                 .flags = clp->cl_exchange_flags,
4502         };
4503         struct nfs41_exchange_id_res res = {
4504                 .client = clp,
4505         };
4506         int status;
4507         struct rpc_message msg = {
4508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4509                 .rpc_argp = &args,
4510                 .rpc_resp = &res,
4511                 .rpc_cred = cred,
4512         };
4513         __be32 *p;
4514
4515         dprintk("--> %s\n", __func__);
4516         BUG_ON(clp == NULL);
4517
4518         /* Remove server-only flags */
4519         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4520
4521         p = (u32 *)verifier.data;
4522         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4523         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4524         args.verifier = &verifier;
4525
4526         while (1) {
4527                 args.id_len = scnprintf(args.id, sizeof(args.id),
4528                                         "%s/%s %u",
4529                                         clp->cl_ipaddr,
4530                                         rpc_peeraddr2str(clp->cl_rpcclient,
4531                                                          RPC_DISPLAY_ADDR),
4532                                         clp->cl_id_uniquifier);
4533
4534                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4535
4536                 if (status != -NFS4ERR_CLID_INUSE)
4537                         break;
4538
4539                 if (signalled())
4540                         break;
4541
4542                 if (++clp->cl_id_uniquifier == 0)
4543                         break;
4544         }
4545
4546         dprintk("<-- %s status= %d\n", __func__, status);
4547         return status;
4548 }
4549
4550 struct nfs4_get_lease_time_data {
4551         struct nfs4_get_lease_time_args *args;
4552         struct nfs4_get_lease_time_res *res;
4553         struct nfs_client *clp;
4554 };
4555
4556 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4557                                         void *calldata)
4558 {
4559         int ret;
4560         struct nfs4_get_lease_time_data *data =
4561                         (struct nfs4_get_lease_time_data *)calldata;
4562
4563         dprintk("--> %s\n", __func__);
4564         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4565         /* just setup sequence, do not trigger session recovery
4566            since we're invoked within one */
4567         ret = nfs41_setup_sequence(data->clp->cl_session,
4568                                    &data->args->la_seq_args,
4569                                    &data->res->lr_seq_res, 0, task);
4570
4571         BUG_ON(ret == -EAGAIN);
4572         rpc_call_start(task);
4573         dprintk("<-- %s\n", __func__);
4574 }
4575
4576 /*
4577  * Called from nfs4_state_manager thread for session setup, so don't recover
4578  * from sequence operation or clientid errors.
4579  */
4580 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4581 {
4582         struct nfs4_get_lease_time_data *data =
4583                         (struct nfs4_get_lease_time_data *)calldata;
4584
4585         dprintk("--> %s\n", __func__);
4586         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4587                 return;
4588         switch (task->tk_status) {
4589         case -NFS4ERR_DELAY:
4590         case -NFS4ERR_GRACE:
4591                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4592                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4593                 task->tk_status = 0;
4594                 nfs_restart_rpc(task, data->clp);
4595                 return;
4596         }
4597         dprintk("<-- %s\n", __func__);
4598 }
4599
4600 struct rpc_call_ops nfs4_get_lease_time_ops = {
4601         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4602         .rpc_call_done = nfs4_get_lease_time_done,
4603 };
4604
4605 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4606 {
4607         struct rpc_task *task;
4608         struct nfs4_get_lease_time_args args;
4609         struct nfs4_get_lease_time_res res = {
4610                 .lr_fsinfo = fsinfo,
4611         };
4612         struct nfs4_get_lease_time_data data = {
4613                 .args = &args,
4614                 .res = &res,
4615                 .clp = clp,
4616         };
4617         struct rpc_message msg = {
4618                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4619                 .rpc_argp = &args,
4620                 .rpc_resp = &res,
4621         };
4622         struct rpc_task_setup task_setup = {
4623                 .rpc_client = clp->cl_rpcclient,
4624                 .rpc_message = &msg,
4625                 .callback_ops = &nfs4_get_lease_time_ops,
4626                 .callback_data = &data
4627         };
4628         int status;
4629
4630         dprintk("--> %s\n", __func__);
4631         task = rpc_run_task(&task_setup);
4632
4633         if (IS_ERR(task))
4634                 status = PTR_ERR(task);
4635         else {
4636                 status = task->tk_status;
4637                 rpc_put_task(task);
4638         }
4639         dprintk("<-- %s return %d\n", __func__, status);
4640
4641         return status;
4642 }
4643
4644 /*
4645  * Reset a slot table
4646  */
4647 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4648                                  int ivalue)
4649 {
4650         struct nfs4_slot *new = NULL;
4651         int i;
4652         int ret = 0;
4653
4654         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4655                 max_reqs, tbl->max_slots);
4656
4657         /* Does the newly negotiated max_reqs match the existing slot table? */
4658         if (max_reqs != tbl->max_slots) {
4659                 ret = -ENOMEM;
4660                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4661                               GFP_NOFS);
4662                 if (!new)
4663                         goto out;
4664                 ret = 0;
4665                 kfree(tbl->slots);
4666         }
4667         spin_lock(&tbl->slot_tbl_lock);
4668         if (new) {
4669                 tbl->slots = new;
4670                 tbl->max_slots = max_reqs;
4671         }
4672         for (i = 0; i < tbl->max_slots; ++i)
4673                 tbl->slots[i].seq_nr = ivalue;
4674         spin_unlock(&tbl->slot_tbl_lock);
4675         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4676                 tbl, tbl->slots, tbl->max_slots);
4677 out:
4678         dprintk("<-- %s: return %d\n", __func__, ret);
4679         return ret;
4680 }
4681
4682 /*
4683  * Reset the forechannel and backchannel slot tables
4684  */
4685 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4686 {
4687         int status;
4688
4689         status = nfs4_reset_slot_table(&session->fc_slot_table,
4690                         session->fc_attrs.max_reqs, 1);
4691         if (status)
4692                 return status;
4693
4694         status = nfs4_reset_slot_table(&session->bc_slot_table,
4695                         session->bc_attrs.max_reqs, 0);
4696         return status;
4697 }
4698
4699 /* Destroy the slot table */
4700 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4701 {
4702         if (session->fc_slot_table.slots != NULL) {
4703                 kfree(session->fc_slot_table.slots);
4704                 session->fc_slot_table.slots = NULL;
4705         }
4706         if (session->bc_slot_table.slots != NULL) {
4707                 kfree(session->bc_slot_table.slots);
4708                 session->bc_slot_table.slots = NULL;
4709         }
4710         return;
4711 }
4712
4713 /*
4714  * Initialize slot table
4715  */
4716 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4717                 int max_slots, int ivalue)
4718 {
4719         struct nfs4_slot *slot;
4720         int ret = -ENOMEM;
4721
4722         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4723
4724         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4725
4726         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4727         if (!slot)
4728                 goto out;
4729         ret = 0;
4730
4731         spin_lock(&tbl->slot_tbl_lock);
4732         tbl->max_slots = max_slots;
4733         tbl->slots = slot;
4734         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4735         spin_unlock(&tbl->slot_tbl_lock);
4736         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4737                 tbl, tbl->slots, tbl->max_slots);
4738 out:
4739         dprintk("<-- %s: return %d\n", __func__, ret);
4740         return ret;
4741 }
4742
4743 /*
4744  * Initialize the forechannel and backchannel tables
4745  */
4746 static int nfs4_init_slot_tables(struct nfs4_session *session)
4747 {
4748         struct nfs4_slot_table *tbl;
4749         int status = 0;
4750
4751         tbl = &session->fc_slot_table;
4752         if (tbl->slots == NULL) {
4753                 status = nfs4_init_slot_table(tbl,
4754                                 session->fc_attrs.max_reqs, 1);
4755                 if (status)
4756                         return status;
4757         }
4758
4759         tbl = &session->bc_slot_table;
4760         if (tbl->slots == NULL) {
4761                 status = nfs4_init_slot_table(tbl,
4762                                 session->bc_attrs.max_reqs, 0);
4763                 if (status)
4764                         nfs4_destroy_slot_tables(session);
4765         }
4766
4767         return status;
4768 }
4769
4770 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4771 {
4772         struct nfs4_session *session;
4773         struct nfs4_slot_table *tbl;
4774
4775         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4776         if (!session)
4777                 return NULL;
4778
4779         init_completion(&session->complete);
4780
4781         tbl = &session->fc_slot_table;
4782         tbl->highest_used_slotid = -1;
4783         spin_lock_init(&tbl->slot_tbl_lock);
4784         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4785
4786         tbl = &session->bc_slot_table;
4787         tbl->highest_used_slotid = -1;
4788         spin_lock_init(&tbl->slot_tbl_lock);
4789         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4790
4791         session->session_state = 1<<NFS4_SESSION_INITING;
4792
4793         session->clp = clp;
4794         return session;
4795 }
4796
4797 void nfs4_destroy_session(struct nfs4_session *session)
4798 {
4799         nfs4_proc_destroy_session(session);
4800         dprintk("%s Destroy backchannel for xprt %p\n",
4801                 __func__, session->clp->cl_rpcclient->cl_xprt);
4802         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4803                                 NFS41_BC_MIN_CALLBACKS);
4804         nfs4_destroy_slot_tables(session);
4805         kfree(session);
4806 }
4807
4808 /*
4809  * Initialize the values to be used by the client in CREATE_SESSION
4810  * If nfs4_init_session set the fore channel request and response sizes,
4811  * use them.
4812  *
4813  * Set the back channel max_resp_sz_cached to zero to force the client to
4814  * always set csa_cachethis to FALSE because the current implementation
4815  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4816  */
4817 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4818 {
4819         struct nfs4_session *session = args->client->cl_session;
4820         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4821                      mxresp_sz = session->fc_attrs.max_resp_sz;
4822
4823         if (mxrqst_sz == 0)
4824                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4825         if (mxresp_sz == 0)
4826                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4827         /* Fore channel attributes */
4828         args->fc_attrs.headerpadsz = 0;
4829         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4830         args->fc_attrs.max_resp_sz = mxresp_sz;
4831         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4832         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4833
4834         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4835                 "max_ops=%u max_reqs=%u\n",
4836                 __func__,
4837                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4838                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4839
4840         /* Back channel attributes */
4841         args->bc_attrs.headerpadsz = 0;
4842         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4843         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4844         args->bc_attrs.max_resp_sz_cached = 0;
4845         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4846         args->bc_attrs.max_reqs = 1;
4847
4848         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4849                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4850                 __func__,
4851                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4852                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4853                 args->bc_attrs.max_reqs);
4854 }
4855
4856 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4857 {
4858         struct nfs4_channel_attrs *sent = &args->fc_attrs;
4859         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4860
4861         if (rcvd->headerpadsz > sent->headerpadsz)
4862                 return -EINVAL;
4863         if (rcvd->max_resp_sz > sent->max_resp_sz)
4864                 return -EINVAL;
4865         /*
4866          * Our requested max_ops is the minimum we need; we're not
4867          * prepared to break up compounds into smaller pieces than that.
4868          * So, no point even trying to continue if the server won't
4869          * cooperate:
4870          */
4871         if (rcvd->max_ops < sent->max_ops)
4872                 return -EINVAL;
4873         if (rcvd->max_reqs == 0)
4874                 return -EINVAL;
4875         return 0;
4876 }
4877
4878 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4879 {
4880         struct nfs4_channel_attrs *sent = &args->bc_attrs;
4881         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4882
4883         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4884                 return -EINVAL;
4885         if (rcvd->max_resp_sz < sent->max_resp_sz)
4886                 return -EINVAL;
4887         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4888                 return -EINVAL;
4889         /* These would render the backchannel useless: */
4890         if (rcvd->max_ops  == 0)
4891                 return -EINVAL;
4892         if (rcvd->max_reqs == 0)
4893                 return -EINVAL;
4894         return 0;
4895 }
4896
4897 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4898                                      struct nfs4_session *session)
4899 {
4900         int ret;
4901
4902         ret = nfs4_verify_fore_channel_attrs(args, session);
4903         if (ret)
4904                 return ret;
4905         return nfs4_verify_back_channel_attrs(args, session);
4906 }
4907
4908 static int _nfs4_proc_create_session(struct nfs_client *clp)
4909 {
4910         struct nfs4_session *session = clp->cl_session;
4911         struct nfs41_create_session_args args = {
4912                 .client = clp,
4913                 .cb_program = NFS4_CALLBACK,
4914         };
4915         struct nfs41_create_session_res res = {
4916                 .client = clp,
4917         };
4918         struct rpc_message msg = {
4919                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4920                 .rpc_argp = &args,
4921                 .rpc_resp = &res,
4922         };
4923         int status;
4924
4925         nfs4_init_channel_attrs(&args);
4926         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4927
4928         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4929
4930         if (!status)
4931                 /* Verify the session's negotiated channel_attrs values */
4932                 status = nfs4_verify_channel_attrs(&args, session);
4933         if (!status) {
4934                 /* Increment the clientid slot sequence id */
4935                 clp->cl_seqid++;
4936         }
4937
4938         return status;
4939 }
4940
4941 /*
4942  * Issues a CREATE_SESSION operation to the server.
4943  * It is the responsibility of the caller to verify the session is
4944  * expired before calling this routine.
4945  */
4946 int nfs4_proc_create_session(struct nfs_client *clp)
4947 {
4948         int status;
4949         unsigned *ptr;
4950         struct nfs4_session *session = clp->cl_session;
4951
4952         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4953
4954         status = _nfs4_proc_create_session(clp);
4955         if (status)
4956                 goto out;
4957
4958         /* Init and reset the fore channel */
4959         status = nfs4_init_slot_tables(session);
4960         dprintk("slot table initialization returned %d\n", status);
4961         if (status)
4962                 goto out;
4963         status = nfs4_reset_slot_tables(session);
4964         dprintk("slot table reset returned %d\n", status);
4965         if (status)
4966                 goto out;
4967
4968         ptr = (unsigned *)&session->sess_id.data[0];
4969         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4970                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4971 out:
4972         dprintk("<-- %s\n", __func__);
4973         return status;
4974 }
4975
4976 /*
4977  * Issue the over-the-wire RPC DESTROY_SESSION.
4978  * The caller must serialize access to this routine.
4979  */
4980 int nfs4_proc_destroy_session(struct nfs4_session *session)
4981 {
4982         int status = 0;
4983         struct rpc_message msg;
4984
4985         dprintk("--> nfs4_proc_destroy_session\n");
4986
4987         /* session is still being setup */
4988         if (session->clp->cl_cons_state != NFS_CS_READY)
4989                 return status;
4990
4991         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4992         msg.rpc_argp = session;
4993         msg.rpc_resp = NULL;
4994         msg.rpc_cred = NULL;
4995         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4996
4997         if (status)
4998                 printk(KERN_WARNING
4999                         "Got error %d from the server on DESTROY_SESSION. "
5000                         "Session has been destroyed regardless...\n", status);
5001
5002         dprintk("<-- nfs4_proc_destroy_session\n");
5003         return status;
5004 }
5005
5006 int nfs4_init_session(struct nfs_server *server)
5007 {
5008         struct nfs_client *clp = server->nfs_client;
5009         struct nfs4_session *session;
5010         unsigned int rsize, wsize;
5011         int ret;
5012
5013         if (!nfs4_has_session(clp))
5014                 return 0;
5015
5016         session = clp->cl_session;
5017         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5018                 return 0;
5019
5020         rsize = server->rsize;
5021         if (rsize == 0)
5022                 rsize = NFS_MAX_FILE_IO_SIZE;
5023         wsize = server->wsize;
5024         if (wsize == 0)
5025                 wsize = NFS_MAX_FILE_IO_SIZE;
5026
5027         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5028         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5029
5030         ret = nfs4_recover_expired_lease(server);
5031         if (!ret)
5032                 ret = nfs4_check_client_ready(clp);
5033         return ret;
5034 }
5035
5036 /*
5037  * Renew the cl_session lease.
5038  */
5039 struct nfs4_sequence_data {
5040         struct nfs_client *clp;
5041         struct nfs4_sequence_args args;
5042         struct nfs4_sequence_res res;
5043 };
5044
5045 static void nfs41_sequence_release(void *data)
5046 {
5047         struct nfs4_sequence_data *calldata = data;
5048         struct nfs_client *clp = calldata->clp;
5049
5050         if (atomic_read(&clp->cl_count) > 1)
5051                 nfs4_schedule_state_renewal(clp);
5052         nfs_put_client(clp);
5053         kfree(calldata);
5054 }
5055
5056 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5057 {
5058         switch(task->tk_status) {
5059         case -NFS4ERR_DELAY:
5060                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5061                 return -EAGAIN;
5062         default:
5063                 nfs4_schedule_state_recovery(clp);
5064         }
5065         return 0;
5066 }
5067
5068 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5069 {
5070         struct nfs4_sequence_data *calldata = data;
5071         struct nfs_client *clp = calldata->clp;
5072
5073         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5074                 return;
5075
5076         if (task->tk_status < 0) {
5077                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5078                 if (atomic_read(&clp->cl_count) == 1)
5079                         goto out;
5080
5081                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5082                         rpc_restart_call_prepare(task);
5083                         return;
5084                 }
5085         }
5086         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5087 out:
5088         dprintk("<-- %s\n", __func__);
5089 }
5090
5091 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5092 {
5093         struct nfs4_sequence_data *calldata = data;
5094         struct nfs_client *clp = calldata->clp;
5095         struct nfs4_sequence_args *args;
5096         struct nfs4_sequence_res *res;
5097
5098         args = task->tk_msg.rpc_argp;
5099         res = task->tk_msg.rpc_resp;
5100
5101         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5102                 return;
5103         rpc_call_start(task);
5104 }
5105
5106 static const struct rpc_call_ops nfs41_sequence_ops = {
5107         .rpc_call_done = nfs41_sequence_call_done,
5108         .rpc_call_prepare = nfs41_sequence_prepare,
5109         .rpc_release = nfs41_sequence_release,
5110 };
5111
5112 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5113 {
5114         struct nfs4_sequence_data *calldata;
5115         struct rpc_message msg = {
5116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5117                 .rpc_cred = cred,
5118         };
5119         struct rpc_task_setup task_setup_data = {
5120                 .rpc_client = clp->cl_rpcclient,
5121                 .rpc_message = &msg,
5122                 .callback_ops = &nfs41_sequence_ops,
5123                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5124         };
5125
5126         if (!atomic_inc_not_zero(&clp->cl_count))
5127                 return ERR_PTR(-EIO);
5128         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5129         if (calldata == NULL) {
5130                 nfs_put_client(clp);
5131                 return ERR_PTR(-ENOMEM);
5132         }
5133         msg.rpc_argp = &calldata->args;
5134         msg.rpc_resp = &calldata->res;
5135         calldata->clp = clp;
5136         task_setup_data.callback_data = calldata;
5137
5138         return rpc_run_task(&task_setup_data);
5139 }
5140
5141 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5142 {
5143         struct rpc_task *task;
5144         int ret = 0;
5145
5146         task = _nfs41_proc_sequence(clp, cred);
5147         if (IS_ERR(task))
5148                 ret = PTR_ERR(task);
5149         else
5150                 rpc_put_task(task);
5151         dprintk("<-- %s status=%d\n", __func__, ret);
5152         return ret;
5153 }
5154
5155 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5156 {
5157         struct rpc_task *task;
5158         int ret;
5159
5160         task = _nfs41_proc_sequence(clp, cred);
5161         if (IS_ERR(task)) {
5162                 ret = PTR_ERR(task);
5163                 goto out;
5164         }
5165         ret = rpc_wait_for_completion_task(task);
5166         if (!ret)
5167                 ret = task->tk_status;
5168         rpc_put_task(task);
5169 out:
5170         dprintk("<-- %s status=%d\n", __func__, ret);
5171         return ret;
5172 }
5173
5174 struct nfs4_reclaim_complete_data {
5175         struct nfs_client *clp;
5176         struct nfs41_reclaim_complete_args arg;
5177         struct nfs41_reclaim_complete_res res;
5178 };
5179
5180 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5181 {
5182         struct nfs4_reclaim_complete_data *calldata = data;
5183
5184         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5185         if (nfs41_setup_sequence(calldata->clp->cl_session,
5186                                 &calldata->arg.seq_args,
5187                                 &calldata->res.seq_res, 0, task))
5188                 return;
5189
5190         rpc_call_start(task);
5191 }
5192
5193 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5194 {
5195         switch(task->tk_status) {
5196         case 0:
5197         case -NFS4ERR_COMPLETE_ALREADY:
5198         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5199                 break;
5200         case -NFS4ERR_DELAY:
5201                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5202                 return -EAGAIN;
5203         default:
5204                 nfs4_schedule_state_recovery(clp);
5205         }
5206         return 0;
5207 }
5208
5209 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5210 {
5211         struct nfs4_reclaim_complete_data *calldata = data;
5212         struct nfs_client *clp = calldata->clp;
5213         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5214
5215         dprintk("--> %s\n", __func__);
5216         if (!nfs41_sequence_done(task, res))
5217                 return;
5218
5219         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5220                 rpc_restart_call_prepare(task);
5221                 return;
5222         }
5223         dprintk("<-- %s\n", __func__);
5224 }
5225
5226 static void nfs4_free_reclaim_complete_data(void *data)
5227 {
5228         struct nfs4_reclaim_complete_data *calldata = data;
5229
5230         kfree(calldata);
5231 }
5232
5233 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5234         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5235         .rpc_call_done = nfs4_reclaim_complete_done,
5236         .rpc_release = nfs4_free_reclaim_complete_data,
5237 };
5238
5239 /*
5240  * Issue a global reclaim complete.
5241  */
5242 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5243 {
5244         struct nfs4_reclaim_complete_data *calldata;
5245         struct rpc_task *task;
5246         struct rpc_message msg = {
5247                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5248         };
5249         struct rpc_task_setup task_setup_data = {
5250                 .rpc_client = clp->cl_rpcclient,
5251                 .rpc_message = &msg,
5252                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5253                 .flags = RPC_TASK_ASYNC,
5254         };
5255         int status = -ENOMEM;
5256
5257         dprintk("--> %s\n", __func__);
5258         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5259         if (calldata == NULL)
5260                 goto out;
5261         calldata->clp = clp;
5262         calldata->arg.one_fs = 0;
5263
5264         msg.rpc_argp = &calldata->arg;
5265         msg.rpc_resp = &calldata->res;
5266         task_setup_data.callback_data = calldata;
5267         task = rpc_run_task(&task_setup_data);
5268         if (IS_ERR(task)) {
5269                 status = PTR_ERR(task);
5270                 goto out;
5271         }
5272         rpc_put_task(task);
5273         return 0;
5274 out:
5275         dprintk("<-- %s status=%d\n", __func__, status);
5276         return status;
5277 }
5278
5279 static void
5280 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5281 {
5282         struct nfs4_layoutget *lgp = calldata;
5283         struct inode *ino = lgp->args.inode;
5284         struct nfs_server *server = NFS_SERVER(ino);
5285
5286         dprintk("--> %s\n", __func__);
5287         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5288                                 &lgp->res.seq_res, 0, task))
5289                 return;
5290         rpc_call_start(task);
5291 }
5292
5293 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5294 {
5295         struct nfs4_layoutget *lgp = calldata;
5296         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5297
5298         dprintk("--> %s\n", __func__);
5299
5300         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5301                 return;
5302
5303         switch (task->tk_status) {
5304         case 0:
5305                 break;
5306         case -NFS4ERR_LAYOUTTRYLATER:
5307         case -NFS4ERR_RECALLCONFLICT:
5308                 task->tk_status = -NFS4ERR_DELAY;
5309                 /* Fall through */
5310         default:
5311                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5312                         rpc_restart_call_prepare(task);
5313                         return;
5314                 }
5315         }
5316         lgp->status = task->tk_status;
5317         dprintk("<-- %s\n", __func__);
5318 }
5319
5320 static void nfs4_layoutget_release(void *calldata)
5321 {
5322         struct nfs4_layoutget *lgp = calldata;
5323
5324         dprintk("--> %s\n", __func__);
5325         put_layout_hdr(lgp->args.inode);
5326         if (lgp->res.layout.buf != NULL)
5327                 free_page((unsigned long) lgp->res.layout.buf);
5328         put_nfs_open_context(lgp->args.ctx);
5329         kfree(calldata);
5330         dprintk("<-- %s\n", __func__);
5331 }
5332
5333 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5334         .rpc_call_prepare = nfs4_layoutget_prepare,
5335         .rpc_call_done = nfs4_layoutget_done,
5336         .rpc_release = nfs4_layoutget_release,
5337 };
5338
5339 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5340 {
5341         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5342         struct rpc_task *task;
5343         struct rpc_message msg = {
5344                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5345                 .rpc_argp = &lgp->args,
5346                 .rpc_resp = &lgp->res,
5347         };
5348         struct rpc_task_setup task_setup_data = {
5349                 .rpc_client = server->client,
5350                 .rpc_message = &msg,
5351                 .callback_ops = &nfs4_layoutget_call_ops,
5352                 .callback_data = lgp,
5353                 .flags = RPC_TASK_ASYNC,
5354         };
5355         int status = 0;
5356
5357         dprintk("--> %s\n", __func__);
5358
5359         lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5360         if (lgp->res.layout.buf == NULL) {
5361                 nfs4_layoutget_release(lgp);
5362                 return -ENOMEM;
5363         }
5364
5365         lgp->res.seq_res.sr_slot = NULL;
5366         task = rpc_run_task(&task_setup_data);
5367         if (IS_ERR(task))
5368                 return PTR_ERR(task);
5369         status = nfs4_wait_for_completion_rpc_task(task);
5370         if (status != 0)
5371                 goto out;
5372         status = lgp->status;
5373         if (status != 0)
5374                 goto out;
5375         status = pnfs_layout_process(lgp);
5376 out:
5377         rpc_put_task(task);
5378         dprintk("<-- %s status=%d\n", __func__, status);
5379         return status;
5380 }
5381
5382 static int
5383 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5384 {
5385         struct nfs4_getdeviceinfo_args args = {
5386                 .pdev = pdev,
5387         };
5388         struct nfs4_getdeviceinfo_res res = {
5389                 .pdev = pdev,
5390         };
5391         struct rpc_message msg = {
5392                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5393                 .rpc_argp = &args,
5394                 .rpc_resp = &res,
5395         };
5396         int status;
5397
5398         dprintk("--> %s\n", __func__);
5399         status = nfs4_call_sync(server, &msg, &args, &res, 0);
5400         dprintk("<-- %s status=%d\n", __func__, status);
5401
5402         return status;
5403 }
5404
5405 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5406 {
5407         struct nfs4_exception exception = { };
5408         int err;
5409
5410         do {
5411                 err = nfs4_handle_exception(server,
5412                                         _nfs4_proc_getdeviceinfo(server, pdev),
5413                                         &exception);
5414         } while (exception.retry);
5415         return err;
5416 }
5417 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5418
5419 #endif /* CONFIG_NFS_V4_1 */
5420
5421 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5422         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5423         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5424         .recover_open   = nfs4_open_reclaim,
5425         .recover_lock   = nfs4_lock_reclaim,
5426         .establish_clid = nfs4_init_clientid,
5427         .get_clid_cred  = nfs4_get_setclientid_cred,
5428 };
5429
5430 #if defined(CONFIG_NFS_V4_1)
5431 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5432         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5433         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5434         .recover_open   = nfs4_open_reclaim,
5435         .recover_lock   = nfs4_lock_reclaim,
5436         .establish_clid = nfs41_init_clientid,
5437         .get_clid_cred  = nfs4_get_exchange_id_cred,
5438         .reclaim_complete = nfs41_proc_reclaim_complete,
5439 };
5440 #endif /* CONFIG_NFS_V4_1 */
5441
5442 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5443         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5444         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5445         .recover_open   = nfs4_open_expired,
5446         .recover_lock   = nfs4_lock_expired,
5447         .establish_clid = nfs4_init_clientid,
5448         .get_clid_cred  = nfs4_get_setclientid_cred,
5449 };
5450
5451 #if defined(CONFIG_NFS_V4_1)
5452 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5453         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5454         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5455         .recover_open   = nfs4_open_expired,
5456         .recover_lock   = nfs4_lock_expired,
5457         .establish_clid = nfs41_init_clientid,
5458         .get_clid_cred  = nfs4_get_exchange_id_cred,
5459 };
5460 #endif /* CONFIG_NFS_V4_1 */
5461
5462 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5463         .sched_state_renewal = nfs4_proc_async_renew,
5464         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5465         .renew_lease = nfs4_proc_renew,
5466 };
5467
5468 #if defined(CONFIG_NFS_V4_1)
5469 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5470         .sched_state_renewal = nfs41_proc_async_sequence,
5471         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5472         .renew_lease = nfs4_proc_sequence,
5473 };
5474 #endif
5475
5476 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5477         .minor_version = 0,
5478         .call_sync = _nfs4_call_sync,
5479         .validate_stateid = nfs4_validate_delegation_stateid,
5480         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5481         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5482         .state_renewal_ops = &nfs40_state_renewal_ops,
5483 };
5484
5485 #if defined(CONFIG_NFS_V4_1)
5486 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5487         .minor_version = 1,
5488         .call_sync = _nfs4_call_sync_session,
5489         .validate_stateid = nfs41_validate_delegation_stateid,
5490         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5491         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5492         .state_renewal_ops = &nfs41_state_renewal_ops,
5493 };
5494 #endif
5495
5496 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5497         [0] = &nfs_v4_0_minor_ops,
5498 #if defined(CONFIG_NFS_V4_1)
5499         [1] = &nfs_v4_1_minor_ops,
5500 #endif
5501 };
5502
5503 static const struct inode_operations nfs4_file_inode_operations = {
5504         .permission     = nfs_permission,
5505         .getattr        = nfs_getattr,
5506         .setattr        = nfs_setattr,
5507         .getxattr       = generic_getxattr,
5508         .setxattr       = generic_setxattr,
5509         .listxattr      = generic_listxattr,
5510         .removexattr    = generic_removexattr,
5511 };
5512
5513 const struct nfs_rpc_ops nfs_v4_clientops = {
5514         .version        = 4,                    /* protocol version */
5515         .dentry_ops     = &nfs4_dentry_operations,
5516         .dir_inode_ops  = &nfs4_dir_inode_operations,
5517         .file_inode_ops = &nfs4_file_inode_operations,
5518         .getroot        = nfs4_proc_get_root,
5519         .getattr        = nfs4_proc_getattr,
5520         .setattr        = nfs4_proc_setattr,
5521         .lookupfh       = nfs4_proc_lookupfh,
5522         .lookup         = nfs4_proc_lookup,
5523         .access         = nfs4_proc_access,
5524         .readlink       = nfs4_proc_readlink,
5525         .create         = nfs4_proc_create,
5526         .remove         = nfs4_proc_remove,
5527         .unlink_setup   = nfs4_proc_unlink_setup,
5528         .unlink_done    = nfs4_proc_unlink_done,
5529         .rename         = nfs4_proc_rename,
5530         .rename_setup   = nfs4_proc_rename_setup,
5531         .rename_done    = nfs4_proc_rename_done,
5532         .link           = nfs4_proc_link,
5533         .symlink        = nfs4_proc_symlink,
5534         .mkdir          = nfs4_proc_mkdir,
5535         .rmdir          = nfs4_proc_remove,
5536         .readdir        = nfs4_proc_readdir,
5537         .mknod          = nfs4_proc_mknod,
5538         .statfs         = nfs4_proc_statfs,
5539         .fsinfo         = nfs4_proc_fsinfo,
5540         .pathconf       = nfs4_proc_pathconf,
5541         .set_capabilities = nfs4_server_capabilities,
5542         .decode_dirent  = nfs4_decode_dirent,
5543         .read_setup     = nfs4_proc_read_setup,
5544         .read_done      = nfs4_read_done,
5545         .write_setup    = nfs4_proc_write_setup,
5546         .write_done     = nfs4_write_done,
5547         .commit_setup   = nfs4_proc_commit_setup,
5548         .commit_done    = nfs4_commit_done,
5549         .lock           = nfs4_proc_lock,
5550         .clear_acl_cache = nfs4_zap_acl_attr,
5551         .close_context  = nfs4_close_context,
5552         .open_context   = nfs4_atomic_open,
5553 };
5554
5555 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
5556         .prefix = XATTR_NAME_NFSV4_ACL,
5557         .list   = nfs4_xattr_list_nfs4_acl,
5558         .get    = nfs4_xattr_get_nfs4_acl,
5559         .set    = nfs4_xattr_set_nfs4_acl,
5560 };
5561
5562 const struct xattr_handler *nfs4_xattr_handlers[] = {
5563         &nfs4_xattr_nfs4_acl_handler,
5564         NULL
5565 };
5566
5567 /*
5568  * Local variables:
5569  *  c-basic-offset: 8
5570  * End:
5571  */