fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  65
  66 struct nfs4_opendata;
  67 static int _nfs4_proc_open(struct nfs4_opendata *data);
  68 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  69 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  70 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  71 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  72 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73
  74 /* Prevent leaks of NFSv4 errors into userland */
  75 static int nfs4_map_errors(int err)
  76 {
  77         if (err >= -1000)
  78                 return err;
  79         switch (err) {
  80         case -NFS4ERR_RESOURCE:
  81                 return -EREMOTEIO;
  82         default:
  83                 dprintk("%s could not handle NFSv4 error %d\n",
  84                                 __func__, -err);
  85                 break;
  86         }
  87         return -EIO;
  88 }
  89
  90 /*
  91  * This is our standard bitmap for GETATTR requests.
  92  */
  93 const u32 nfs4_fattr_bitmap[2] = {
  94         FATTR4_WORD0_TYPE
  95         | FATTR4_WORD0_CHANGE
  96         | FATTR4_WORD0_SIZE
  97         | FATTR4_WORD0_FSID
  98         | FATTR4_WORD0_FILEID,
  99         FATTR4_WORD1_MODE
 100         | FATTR4_WORD1_NUMLINKS
 101         | FATTR4_WORD1_OWNER
 102         | FATTR4_WORD1_OWNER_GROUP
 103         | FATTR4_WORD1_RAWDEV
 104         | FATTR4_WORD1_SPACE_USED
 105         | FATTR4_WORD1_TIME_ACCESS
 106         | FATTR4_WORD1_TIME_METADATA
 107         | FATTR4_WORD1_TIME_MODIFY
 108 };
 109
 110 const u32 nfs4_statfs_bitmap[2] = {
 111         FATTR4_WORD0_FILES_AVAIL
 112         | FATTR4_WORD0_FILES_FREE
 113         | FATTR4_WORD0_FILES_TOTAL,
 114         FATTR4_WORD1_SPACE_AVAIL
 115         | FATTR4_WORD1_SPACE_FREE
 116         | FATTR4_WORD1_SPACE_TOTAL
 117 };
 118
 119 const u32 nfs4_pathconf_bitmap[2] = {
 120         FATTR4_WORD0_MAXLINK
 121         | FATTR4_WORD0_MAXNAME,
 122         0
 123 };
 124
 125 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 126                         | FATTR4_WORD0_MAXREAD
 127                         | FATTR4_WORD0_MAXWRITE
 128                         | FATTR4_WORD0_LEASE_TIME,
 129                         0
 130 };
 131
 132 const u32 nfs4_fs_locations_bitmap[2] = {
 133         FATTR4_WORD0_TYPE
 134         | FATTR4_WORD0_CHANGE
 135         | FATTR4_WORD0_SIZE
 136         | FATTR4_WORD0_FSID
 137         | FATTR4_WORD0_FILEID
 138         | FATTR4_WORD0_FS_LOCATIONS,
 139         FATTR4_WORD1_MODE
 140         | FATTR4_WORD1_NUMLINKS
 141         | FATTR4_WORD1_OWNER
 142         | FATTR4_WORD1_OWNER_GROUP
 143         | FATTR4_WORD1_RAWDEV
 144         | FATTR4_WORD1_SPACE_USED
 145         | FATTR4_WORD1_TIME_ACCESS
 146         | FATTR4_WORD1_TIME_METADATA
 147         | FATTR4_WORD1_TIME_MODIFY
 148         | FATTR4_WORD1_MOUNTED_ON_FILEID
 149 };
 150
 151 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 152                 struct nfs4_readdir_arg *readdir)
 153 {
 154         __be32 *start, *p;
 155
 156         BUG_ON(readdir->count < 80);
 157         if (cookie > 2) {
 158                 readdir->cookie = cookie;
 159                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 160                 return;
 161         }
 162
 163         readdir->cookie = 0;
 164         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 165         if (cookie == 2)
 166                 return;
 167
 168         /*
 169          * NFSv4 servers do not return entries for '.' and '..'
 170          * Therefore, we fake these entries here.  We let '.'
 171          * have cookie 0 and '..' have cookie 1.  Note that
 172          * when talking to the server, we always send cookie 0
 173          * instead of 1 or 2.
 174          */
 175         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 176
 177         if (cookie == 0) {
 178                 *p++ = xdr_one;                                  /* next */
 179                 *p++ = xdr_zero;                   /* cookie, first word */
 180                 *p++ = xdr_one;                   /* cookie, second word */
 181                 *p++ = xdr_one;                             /* entry len */
 182                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 183                 p++;
 184                 *p++ = xdr_one;                         /* bitmap length */
 185                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 186                 *p++ = htonl(8);              /* attribute buffer length */
 187                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 188         }
 189
 190         *p++ = xdr_one;                                  /* next */
 191         *p++ = xdr_zero;                   /* cookie, first word */
 192         *p++ = xdr_two;                   /* cookie, second word */
 193         *p++ = xdr_two;                             /* entry len */
 194         memcpy(p, "..\0\0", 4);                         /* entry */
 195         p++;
 196         *p++ = xdr_one;                         /* bitmap length */
 197         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 198         *p++ = htonl(8);              /* attribute buffer length */
 199         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 200
 201         readdir->pgbase = (char *)p - (char *)start;
 202         readdir->count -= readdir->pgbase;
 203         kunmap_atomic(start, KM_USER0);
 204 }
 205
 206 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 207 {
 208         int res;
 209
 210         might_sleep();
 211
 212         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 213                         nfs_wait_bit_killable, TASK_KILLABLE);
 214         return res;
 215 }
 216
 217 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 218 {
 219         int res = 0;
 220
 221         might_sleep();
 222
 223         if (*timeout <= 0)
 224                 *timeout = NFS4_POLL_RETRY_MIN;
 225         if (*timeout > NFS4_POLL_RETRY_MAX)
 226                 *timeout = NFS4_POLL_RETRY_MAX;
 227         schedule_timeout_killable(*timeout);
 228         if (fatal_signal_pending(current))
 229                 res = -ERESTARTSYS;
 230         *timeout <<= 1;
 231         return res;
 232 }
 233
 234 /* This is the error handling routine for processes that are allowed
 235  * to sleep.
 236  */
 237 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 238 {
 239         struct nfs_client *clp = server->nfs_client;
 240         struct nfs4_state *state = exception->state;
 241         int ret = errorcode;
 242
 243         exception->retry = 0;
 244         switch(errorcode) {
 245                 case 0:
 246                         return 0;
 247                 case -NFS4ERR_ADMIN_REVOKED:
 248                 case -NFS4ERR_BAD_STATEID:
 249                 case -NFS4ERR_OPENMODE:
 250                         if (state == NULL)
 251                                 break;
 252                         nfs4_state_mark_reclaim_nograce(clp, state);
 253                         goto do_state_recovery;
 254                 case -NFS4ERR_STALE_STATEID:
 255                         if (state == NULL)
 256                                 break;
 257                         nfs4_state_mark_reclaim_reboot(clp, state);
 258                 case -NFS4ERR_STALE_CLIENTID:
 259                 case -NFS4ERR_EXPIRED:
 260                         goto do_state_recovery;
 261 #if defined(CONFIG_NFS_V4_1)
 262                 case -NFS4ERR_BADSESSION:
 263                 case -NFS4ERR_BADSLOT:
 264                 case -NFS4ERR_BAD_HIGH_SLOT:
 265                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 266                 case -NFS4ERR_DEADSESSION:
 267                 case -NFS4ERR_SEQ_FALSE_RETRY:
 268                 case -NFS4ERR_SEQ_MISORDERED:
 269                         dprintk("%s ERROR: %d Reset session\n", __func__,
 270                                 errorcode);
 271                         nfs4_schedule_state_recovery(clp);
 272                         exception->retry = 1;
 273                         break;
 274 #endif /* defined(CONFIG_NFS_V4_1) */
 275                 case -NFS4ERR_FILE_OPEN:
 276                         if (exception->timeout > HZ) {
 277                                 /* We have retried a decent amount, time to
 278                                  * fail
 279                                  */
 280                                 ret = -EBUSY;
 281                                 break;
 282                         }
 283                 case -NFS4ERR_GRACE:
 284                 case -NFS4ERR_DELAY:
 285                 case -EKEYEXPIRED:
 286                         ret = nfs4_delay(server->client, &exception->timeout);
 287                         if (ret != 0)
 288                                 break;
 289                 case -NFS4ERR_OLD_STATEID:
 290                         exception->retry = 1;
 291         }
 292         /* We failed to handle the error */
 293         return nfs4_map_errors(ret);
 294 do_state_recovery:
 295         nfs4_schedule_state_recovery(clp);
 296         ret = nfs4_wait_clnt_recover(clp);
 297         if (ret == 0)
 298                 exception->retry = 1;
 299         return ret;
 300 }
 301
 302
 303 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 304 {
 305         struct nfs_client *clp = server->nfs_client;
 306         spin_lock(&clp->cl_lock);
 307         if (time_before(clp->cl_last_renewal,timestamp))
 308                 clp->cl_last_renewal = timestamp;
 309         spin_unlock(&clp->cl_lock);
 310 }
 311
 312 #if defined(CONFIG_NFS_V4_1)
 313
 314 /*
 315  * nfs4_free_slot - free a slot and efficiently update slot table.
 316  *
 317  * freeing a slot is trivially done by clearing its respective bit
 318  * in the bitmap.
 319  * If the freed slotid equals highest_used_slotid we want to update it
 320  * so that the server would be able to size down the slot table if needed,
 321  * otherwise we know that the highest_used_slotid is still in use.
 322  * When updating highest_used_slotid there may be "holes" in the bitmap
 323  * so we need to scan down from highest_used_slotid to 0 looking for the now
 324  * highest slotid in use.
 325  * If none found, highest_used_slotid is set to -1.
 326  *
 327  * Must be called while holding tbl->slot_tbl_lock
 328  */
 329 static void
 330 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 331 {
 332         int slotid = free_slotid;
 333
 334         /* clear used bit in bitmap */
 335         __clear_bit(slotid, tbl->used_slots);
 336
 337         /* update highest_used_slotid when it is freed */
 338         if (slotid == tbl->highest_used_slotid) {
 339                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 340                 if (slotid < tbl->max_slots)
 341                         tbl->highest_used_slotid = slotid;
 342                 else
 343                         tbl->highest_used_slotid = -1;
 344         }
 345         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 346                 free_slotid, tbl->highest_used_slotid);
 347 }
 348
 349 /*
 350  * Signal state manager thread if session is drained
 351  */
 352 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 353 {
 354         struct rpc_task *task;
 355
 356         if (!test_bit(NFS4CLNT_SESSION_DRAINING, &ses->clp->cl_state)) {
 357                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 358                 if (task)
 359                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 360                 return;
 361         }
 362
 363         if (ses->fc_slot_table.highest_used_slotid != -1)
 364                 return;
 365
 366         dprintk("%s COMPLETE: Session Drained\n", __func__);
 367         complete(&ses->complete);
 368 }
 369
 370 static void nfs41_sequence_free_slot(const struct nfs_client *clp,
 371                               struct nfs4_sequence_res *res)
 372 {
 373         struct nfs4_slot_table *tbl;
 374
 375         tbl = &clp->cl_session->fc_slot_table;
 376         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 377                 /* just wake up the next guy waiting since
 378                  * we may have not consumed a slot after all */
 379                 dprintk("%s: No slot\n", __func__);
 380                 return;
 381         }
 382
 383         spin_lock(&tbl->slot_tbl_lock);
 384         nfs4_free_slot(tbl, res->sr_slotid);
 385         nfs41_check_drain_session_complete(clp->cl_session);
 386         spin_unlock(&tbl->slot_tbl_lock);
 387         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 388 }
 389
 390 static void nfs41_sequence_done(struct nfs_client *clp,
 391                                 struct nfs4_sequence_res *res,
 392                                 int rpc_status)
 393 {
 394         unsigned long timestamp;
 395         struct nfs4_slot_table *tbl;
 396         struct nfs4_slot *slot;
 397
 398         /*
 399          * sr_status remains 1 if an RPC level error occurred. The server
 400          * may or may not have processed the sequence operation..
 401          * Proceed as if the server received and processed the sequence
 402          * operation.
 403          */
 404         if (res->sr_status == 1)
 405                 res->sr_status = NFS_OK;
 406
 407         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 408         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 409                 goto out;
 410
 411         /* Check the SEQUENCE operation status */
 412         if (res->sr_status == 0) {
 413                 tbl = &clp->cl_session->fc_slot_table;
 414                 slot = tbl->slots + res->sr_slotid;
 415                 /* Update the slot's sequence and clientid lease timer */
 416                 ++slot->seq_nr;
 417                 timestamp = res->sr_renewal_time;
 418                 spin_lock(&clp->cl_lock);
 419                 if (time_before(clp->cl_last_renewal, timestamp))
 420                         clp->cl_last_renewal = timestamp;
 421                 spin_unlock(&clp->cl_lock);
 422                 /* Check sequence flags */
 423                 if (atomic_read(&clp->cl_count) > 1)
 424                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 425         }
 426 out:
 427         /* The session may be reset by one of the error handlers. */
 428         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 429         nfs41_sequence_free_slot(clp, res);
 430 }
 431
 432 /*
 433  * nfs4_find_slot - efficiently look for a free slot
 434  *
 435  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 436  * If found, we mark the slot as used, update the highest_used_slotid,
 437  * and respectively set up the sequence operation args.
 438  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 439  *
 440  * Note: must be called with under the slot_tbl_lock.
 441  */
 442 static u8
 443 nfs4_find_slot(struct nfs4_slot_table *tbl)
 444 {
 445         int slotid;
 446         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 447         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 448
 449         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 450                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 451                 tbl->max_slots);
 452         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 453         if (slotid >= tbl->max_slots)
 454                 goto out;
 455         __set_bit(slotid, tbl->used_slots);
 456         if (slotid > tbl->highest_used_slotid)
 457                 tbl->highest_used_slotid = slotid;
 458         ret_id = slotid;
 459 out:
 460         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 461                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 462         return ret_id;
 463 }
 464
 465 static int nfs41_setup_sequence(struct nfs4_session *session,
 466                                 struct nfs4_sequence_args *args,
 467                                 struct nfs4_sequence_res *res,
 468                                 int cache_reply,
 469                                 struct rpc_task *task)
 470 {
 471         struct nfs4_slot *slot;
 472         struct nfs4_slot_table *tbl;
 473         u8 slotid;
 474
 475         dprintk("--> %s\n", __func__);
 476         /* slot already allocated? */
 477         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 478                 return 0;
 479
 480         memset(res, 0, sizeof(*res));
 481         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 482         tbl = &session->fc_slot_table;
 483
 484         spin_lock(&tbl->slot_tbl_lock);
 485         if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state) &&
 486             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 487                 /*
 488                  * The state manager will wait until the slot table is empty.
 489                  * Schedule the reset thread
 490                  */
 491                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 492                 spin_unlock(&tbl->slot_tbl_lock);
 493                 dprintk("%s Schedule Session Reset\n", __func__);
 494                 return -EAGAIN;
 495         }
 496
 497         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 498             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 499                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 500                 spin_unlock(&tbl->slot_tbl_lock);
 501                 dprintk("%s enforce FIFO order\n", __func__);
 502                 return -EAGAIN;
 503         }
 504
 505         slotid = nfs4_find_slot(tbl);
 506         if (slotid == NFS4_MAX_SLOT_TABLE) {
 507                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 508                 spin_unlock(&tbl->slot_tbl_lock);
 509                 dprintk("<-- %s: no free slots\n", __func__);
 510                 return -EAGAIN;
 511         }
 512         spin_unlock(&tbl->slot_tbl_lock);
 513
 514         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 515         slot = tbl->slots + slotid;
 516         args->sa_session = session;
 517         args->sa_slotid = slotid;
 518         args->sa_cache_this = cache_reply;
 519
 520         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 521
 522         res->sr_session = session;
 523         res->sr_slotid = slotid;
 524         res->sr_renewal_time = jiffies;
 525         /*
 526          * sr_status is only set in decode_sequence, and so will remain
 527          * set to 1 if an rpc level failure occurs.
 528          */
 529         res->sr_status = 1;
 530         return 0;
 531 }
 532
 533 int nfs4_setup_sequence(struct nfs_client *clp,
 534                         struct nfs4_sequence_args *args,
 535                         struct nfs4_sequence_res *res,
 536                         int cache_reply,
 537                         struct rpc_task *task)
 538 {
 539         int ret = 0;
 540
 541         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 542                 __func__, clp, clp->cl_session, res->sr_slotid);
 543
 544         if (!nfs4_has_session(clp))
 545                 goto out;
 546         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
 547                                    task);
 548         if (ret && ret != -EAGAIN) {
 549                 /* terminate rpc task */
 550                 task->tk_status = ret;
 551                 task->tk_action = NULL;
 552         }
 553 out:
 554         dprintk("<-- %s status=%d\n", __func__, ret);
 555         return ret;
 556 }
 557
 558 struct nfs41_call_sync_data {
 559         struct nfs_client *clp;
 560         struct nfs4_sequence_args *seq_args;
 561         struct nfs4_sequence_res *seq_res;
 562         int cache_reply;
 563 };
 564
 565 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 566 {
 567         struct nfs41_call_sync_data *data = calldata;
 568
 569         dprintk("--> %s data->clp->cl_session %p\n", __func__,
 570                 data->clp->cl_session);
 571         if (nfs4_setup_sequence(data->clp, data->seq_args,
 572                                 data->seq_res, data->cache_reply, task))
 573                 return;
 574         rpc_call_start(task);
 575 }
 576
 577 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 578 {
 579         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 580         nfs41_call_sync_prepare(task, calldata);
 581 }
 582
 583 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 584 {
 585         struct nfs41_call_sync_data *data = calldata;
 586
 587         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
 588 }
 589
 590 struct rpc_call_ops nfs41_call_sync_ops = {
 591         .rpc_call_prepare = nfs41_call_sync_prepare,
 592         .rpc_call_done = nfs41_call_sync_done,
 593 };
 594
 595 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 596         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 597         .rpc_call_done = nfs41_call_sync_done,
 598 };
 599
 600 static int nfs4_call_sync_sequence(struct nfs_client *clp,
 601                                    struct rpc_clnt *clnt,
 602                                    struct rpc_message *msg,
 603                                    struct nfs4_sequence_args *args,
 604                                    struct nfs4_sequence_res *res,
 605                                    int cache_reply,
 606                                    int privileged)
 607 {
 608         int ret;
 609         struct rpc_task *task;
 610         struct nfs41_call_sync_data data = {
 611                 .clp = clp,
 612                 .seq_args = args,
 613                 .seq_res = res,
 614                 .cache_reply = cache_reply,
 615         };
 616         struct rpc_task_setup task_setup = {
 617                 .rpc_client = clnt,
 618                 .rpc_message = msg,
 619                 .callback_ops = &nfs41_call_sync_ops,
 620                 .callback_data = &data
 621         };
 622
 623         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 624         if (privileged)
 625                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 626         task = rpc_run_task(&task_setup);
 627         if (IS_ERR(task))
 628                 ret = PTR_ERR(task);
 629         else {
 630                 ret = task->tk_status;
 631                 rpc_put_task(task);
 632         }
 633         return ret;
 634 }
 635
 636 int _nfs4_call_sync_session(struct nfs_server *server,
 637                             struct rpc_message *msg,
 638                             struct nfs4_sequence_args *args,
 639                             struct nfs4_sequence_res *res,
 640                             int cache_reply)
 641 {
 642         return nfs4_call_sync_sequence(server->nfs_client, server->client,
 643                                        msg, args, res, cache_reply, 0);
 644 }
 645
 646 #endif /* CONFIG_NFS_V4_1 */
 647
 648 int _nfs4_call_sync(struct nfs_server *server,
 649                     struct rpc_message *msg,
 650                     struct nfs4_sequence_args *args,
 651                     struct nfs4_sequence_res *res,
 652                     int cache_reply)
 653 {
 654         args->sa_session = res->sr_session = NULL;
 655         return rpc_call_sync(server->client, msg, 0);
 656 }
 657
 658 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 659         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 660                         &(res)->seq_res, (cache_reply))
 661
 662 static void nfs4_sequence_done(const struct nfs_server *server,
 663                                struct nfs4_sequence_res *res, int rpc_status)
 664 {
 665 #ifdef CONFIG_NFS_V4_1
 666         if (nfs4_has_session(server->nfs_client))
 667                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
 668 #endif /* CONFIG_NFS_V4_1 */
 669 }
 670
 671 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 672 {
 673         struct nfs_inode *nfsi = NFS_I(dir);
 674
 675         spin_lock(&dir->i_lock);
 676         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 677         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 678                 nfs_force_lookup_revalidate(dir);
 679         nfsi->change_attr = cinfo->after;
 680         spin_unlock(&dir->i_lock);
 681 }
 682
 683 struct nfs4_opendata {
 684         struct kref kref;
 685         struct nfs_openargs o_arg;
 686         struct nfs_openres o_res;
 687         struct nfs_open_confirmargs c_arg;
 688         struct nfs_open_confirmres c_res;
 689         struct nfs_fattr f_attr;
 690         struct nfs_fattr dir_attr;
 691         struct path path;
 692         struct dentry *dir;
 693         struct nfs4_state_owner *owner;
 694         struct nfs4_state *state;
 695         struct iattr attrs;
 696         unsigned long timestamp;
 697         unsigned int rpc_done : 1;
 698         int rpc_status;
 699         int cancelled;
 700 };
 701
 702
 703 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 704 {
 705         p->o_res.f_attr = &p->f_attr;
 706         p->o_res.dir_attr = &p->dir_attr;
 707         p->o_res.seqid = p->o_arg.seqid;
 708         p->c_res.seqid = p->c_arg.seqid;
 709         p->o_res.server = p->o_arg.server;
 710         nfs_fattr_init(&p->f_attr);
 711         nfs_fattr_init(&p->dir_attr);
 712         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 713 }
 714
 715 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 716                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 717                 const struct iattr *attrs)
 718 {
 719         struct dentry *parent = dget_parent(path->dentry);
 720         struct inode *dir = parent->d_inode;
 721         struct nfs_server *server = NFS_SERVER(dir);
 722         struct nfs4_opendata *p;
 723
 724         p = kzalloc(sizeof(*p), GFP_KERNEL);
 725         if (p == NULL)
 726                 goto err;
 727         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 728         if (p->o_arg.seqid == NULL)
 729                 goto err_free;
 730         path_get(path);
 731         p->path = *path;
 732         p->dir = parent;
 733         p->owner = sp;
 734         atomic_inc(&sp->so_count);
 735         p->o_arg.fh = NFS_FH(dir);
 736         p->o_arg.open_flags = flags;
 737         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 738         p->o_arg.clientid = server->nfs_client->cl_clientid;
 739         p->o_arg.id = sp->so_owner_id.id;
 740         p->o_arg.name = &p->path.dentry->d_name;
 741         p->o_arg.server = server;
 742         p->o_arg.bitmask = server->attr_bitmask;
 743         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 744         if (flags & O_EXCL) {
 745                 if (nfs4_has_persistent_session(server->nfs_client)) {
 746                         /* GUARDED */
 747                         p->o_arg.u.attrs = &p->attrs;
 748                         memcpy(&p->attrs, attrs, sizeof(p->attrs));
 749                 } else { /* EXCLUSIVE4_1 */
 750                         u32 *s = (u32 *) p->o_arg.u.verifier.data;
 751                         s[0] = jiffies;
 752                         s[1] = current->pid;
 753                 }
 754         } else if (flags & O_CREAT) {
 755                 p->o_arg.u.attrs = &p->attrs;
 756                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 757         }
 758         p->c_arg.fh = &p->o_res.fh;
 759         p->c_arg.stateid = &p->o_res.stateid;
 760         p->c_arg.seqid = p->o_arg.seqid;
 761         nfs4_init_opendata_res(p);
 762         kref_init(&p->kref);
 763         return p;
 764 err_free:
 765         kfree(p);
 766 err:
 767         dput(parent);
 768         return NULL;
 769 }
 770
 771 static void nfs4_opendata_free(struct kref *kref)
 772 {
 773         struct nfs4_opendata *p = container_of(kref,
 774                         struct nfs4_opendata, kref);
 775
 776         nfs_free_seqid(p->o_arg.seqid);
 777         if (p->state != NULL)
 778                 nfs4_put_open_state(p->state);
 779         nfs4_put_state_owner(p->owner);
 780         dput(p->dir);
 781         path_put(&p->path);
 782         kfree(p);
 783 }
 784
 785 static void nfs4_opendata_put(struct nfs4_opendata *p)
 786 {
 787         if (p != NULL)
 788                 kref_put(&p->kref, nfs4_opendata_free);
 789 }
 790
 791 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 792 {
 793         int ret;
 794
 795         ret = rpc_wait_for_completion_task(task);
 796         return ret;
 797 }
 798
 799 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 800 {
 801         int ret = 0;
 802
 803         if (open_mode & O_EXCL)
 804                 goto out;
 805         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 806                 case FMODE_READ:
 807                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 808                                 && state->n_rdonly != 0;
 809                         break;
 810                 case FMODE_WRITE:
 811                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 812                                 && state->n_wronly != 0;
 813                         break;
 814                 case FMODE_READ|FMODE_WRITE:
 815                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 816                                 && state->n_rdwr != 0;
 817         }
 818 out:
 819         return ret;
 820 }
 821
 822 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 823 {
 824         if ((delegation->type & fmode) != fmode)
 825                 return 0;
 826         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 827                 return 0;
 828         nfs_mark_delegation_referenced(delegation);
 829         return 1;
 830 }
 831
 832 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 833 {
 834         switch (fmode) {
 835                 case FMODE_WRITE:
 836                         state->n_wronly++;
 837                         break;
 838                 case FMODE_READ:
 839                         state->n_rdonly++;
 840                         break;
 841                 case FMODE_READ|FMODE_WRITE:
 842                         state->n_rdwr++;
 843         }
 844         nfs4_state_set_mode_locked(state, state->state | fmode);
 845 }
 846
 847 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 848 {
 849         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 850                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 851         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 852         switch (fmode) {
 853                 case FMODE_READ:
 854                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 855                         break;
 856                 case FMODE_WRITE:
 857                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 858                         break;
 859                 case FMODE_READ|FMODE_WRITE:
 860                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 861         }
 862 }
 863
 864 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 865 {
 866         write_seqlock(&state->seqlock);
 867         nfs_set_open_stateid_locked(state, stateid, fmode);
 868         write_sequnlock(&state->seqlock);
 869 }
 870
 871 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 872 {
 873         /*
 874          * Protect the call to nfs4_state_set_mode_locked and
 875          * serialise the stateid update
 876          */
 877         write_seqlock(&state->seqlock);
 878         if (deleg_stateid != NULL) {
 879                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 880                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 881         }
 882         if (open_stateid != NULL)
 883                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 884         write_sequnlock(&state->seqlock);
 885         spin_lock(&state->owner->so_lock);
 886         update_open_stateflags(state, fmode);
 887         spin_unlock(&state->owner->so_lock);
 888 }
 889
 890 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 891 {
 892         struct nfs_inode *nfsi = NFS_I(state->inode);
 893         struct nfs_delegation *deleg_cur;
 894         int ret = 0;
 895
 896         fmode &= (FMODE_READ|FMODE_WRITE);
 897
 898         rcu_read_lock();
 899         deleg_cur = rcu_dereference(nfsi->delegation);
 900         if (deleg_cur == NULL)
 901                 goto no_delegation;
 902
 903         spin_lock(&deleg_cur->lock);
 904         if (nfsi->delegation != deleg_cur ||
 905             (deleg_cur->type & fmode) != fmode)
 906                 goto no_delegation_unlock;
 907
 908         if (delegation == NULL)
 909                 delegation = &deleg_cur->stateid;
 910         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 911                 goto no_delegation_unlock;
 912
 913         nfs_mark_delegation_referenced(deleg_cur);
 914         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 915         ret = 1;
 916 no_delegation_unlock:
 917         spin_unlock(&deleg_cur->lock);
 918 no_delegation:
 919         rcu_read_unlock();
 920
 921         if (!ret && open_stateid != NULL) {
 922                 __update_open_stateid(state, open_stateid, NULL, fmode);
 923                 ret = 1;
 924         }
 925
 926         return ret;
 927 }
 928
 929
 930 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 931 {
 932         struct nfs_delegation *delegation;
 933
 934         rcu_read_lock();
 935         delegation = rcu_dereference(NFS_I(inode)->delegation);
 936         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 937                 rcu_read_unlock();
 938                 return;
 939         }
 940         rcu_read_unlock();
 941         nfs_inode_return_delegation(inode);
 942 }
 943
 944 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 945 {
 946         struct nfs4_state *state = opendata->state;
 947         struct nfs_inode *nfsi = NFS_I(state->inode);
 948         struct nfs_delegation *delegation;
 949         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 950         fmode_t fmode = opendata->o_arg.fmode;
 951         nfs4_stateid stateid;
 952         int ret = -EAGAIN;
 953
 954         for (;;) {
 955                 if (can_open_cached(state, fmode, open_mode)) {
 956                         spin_lock(&state->owner->so_lock);
 957                         if (can_open_cached(state, fmode, open_mode)) {
 958                                 update_open_stateflags(state, fmode);
 959                                 spin_unlock(&state->owner->so_lock);
 960                                 goto out_return_state;
 961                         }
 962                         spin_unlock(&state->owner->so_lock);
 963                 }
 964                 rcu_read_lock();
 965                 delegation = rcu_dereference(nfsi->delegation);
 966                 if (delegation == NULL ||
 967                     !can_open_delegated(delegation, fmode)) {
 968                         rcu_read_unlock();
 969                         break;
 970                 }
 971                 /* Save the delegation */
 972                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 973                 rcu_read_unlock();
 974                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 975                 if (ret != 0)
 976                         goto out;
 977                 ret = -EAGAIN;
 978
 979                 /* Try to update the stateid using the delegation */
 980                 if (update_open_stateid(state, NULL, &stateid, fmode))
 981                         goto out_return_state;
 982         }
 983 out:
 984         return ERR_PTR(ret);
 985 out_return_state:
 986         atomic_inc(&state->count);
 987         return state;
 988 }
 989
 990 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 991 {
 992         struct inode *inode;
 993         struct nfs4_state *state = NULL;
 994         struct nfs_delegation *delegation;
 995         int ret;
 996
 997         if (!data->rpc_done) {
 998                 state = nfs4_try_open_cached(data);
 999                 goto out;
1000         }
1001
1002         ret = -EAGAIN;
1003         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1004                 goto err;
1005         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1006         ret = PTR_ERR(inode);
1007         if (IS_ERR(inode))
1008                 goto err;
1009         ret = -ENOMEM;
1010         state = nfs4_get_open_state(inode, data->owner);
1011         if (state == NULL)
1012                 goto err_put_inode;
1013         if (data->o_res.delegation_type != 0) {
1014                 int delegation_flags = 0;
1015
1016                 rcu_read_lock();
1017                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1018                 if (delegation)
1019                         delegation_flags = delegation->flags;
1020                 rcu_read_unlock();
1021                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1022                         nfs_inode_set_delegation(state->inode,
1023                                         data->owner->so_cred,
1024                                         &data->o_res);
1025                 else
1026                         nfs_inode_reclaim_delegation(state->inode,
1027                                         data->owner->so_cred,
1028                                         &data->o_res);
1029         }
1030
1031         update_open_stateid(state, &data->o_res.stateid, NULL,
1032                         data->o_arg.fmode);
1033         iput(inode);
1034 out:
1035         return state;
1036 err_put_inode:
1037         iput(inode);
1038 err:
1039         return ERR_PTR(ret);
1040 }
1041
1042 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1043 {
1044         struct nfs_inode *nfsi = NFS_I(state->inode);
1045         struct nfs_open_context *ctx;
1046
1047         spin_lock(&state->inode->i_lock);
1048         list_for_each_entry(ctx, &nfsi->open_files, list) {
1049                 if (ctx->state != state)
1050                         continue;
1051                 get_nfs_open_context(ctx);
1052                 spin_unlock(&state->inode->i_lock);
1053                 return ctx;
1054         }
1055         spin_unlock(&state->inode->i_lock);
1056         return ERR_PTR(-ENOENT);
1057 }
1058
1059 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1060 {
1061         struct nfs4_opendata *opendata;
1062
1063         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1064         if (opendata == NULL)
1065                 return ERR_PTR(-ENOMEM);
1066         opendata->state = state;
1067         atomic_inc(&state->count);
1068         return opendata;
1069 }
1070
1071 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1072 {
1073         struct nfs4_state *newstate;
1074         int ret;
1075
1076         opendata->o_arg.open_flags = 0;
1077         opendata->o_arg.fmode = fmode;
1078         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1079         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1080         nfs4_init_opendata_res(opendata);
1081         ret = _nfs4_recover_proc_open(opendata);
1082         if (ret != 0)
1083                 return ret;
1084         newstate = nfs4_opendata_to_nfs4_state(opendata);
1085         if (IS_ERR(newstate))
1086                 return PTR_ERR(newstate);
1087         nfs4_close_state(&opendata->path, newstate, fmode);
1088         *res = newstate;
1089         return 0;
1090 }
1091
1092 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1093 {
1094         struct nfs4_state *newstate;
1095         int ret;
1096
1097         /* memory barrier prior to reading state->n_* */
1098         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1099         smp_rmb();
1100         if (state->n_rdwr != 0) {
1101                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1102                 if (ret != 0)
1103                         return ret;
1104                 if (newstate != state)
1105                         return -ESTALE;
1106         }
1107         if (state->n_wronly != 0) {
1108                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1109                 if (ret != 0)
1110                         return ret;
1111                 if (newstate != state)
1112                         return -ESTALE;
1113         }
1114         if (state->n_rdonly != 0) {
1115                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1116                 if (ret != 0)
1117                         return ret;
1118                 if (newstate != state)
1119                         return -ESTALE;
1120         }
1121         /*
1122          * We may have performed cached opens for all three recoveries.
1123          * Check if we need to update the current stateid.
1124          */
1125         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1126             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1127                 write_seqlock(&state->seqlock);
1128                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1129                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1130                 write_sequnlock(&state->seqlock);
1131         }
1132         return 0;
1133 }
1134
1135 /*
1136  * OPEN_RECLAIM:
1137  *      reclaim state on the server after a reboot.
1138  */
1139 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1140 {
1141         struct nfs_delegation *delegation;
1142         struct nfs4_opendata *opendata;
1143         fmode_t delegation_type = 0;
1144         int status;
1145
1146         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1147         if (IS_ERR(opendata))
1148                 return PTR_ERR(opendata);
1149         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1150         opendata->o_arg.fh = NFS_FH(state->inode);
1151         rcu_read_lock();
1152         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1153         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1154                 delegation_type = delegation->type;
1155         rcu_read_unlock();
1156         opendata->o_arg.u.delegation_type = delegation_type;
1157         status = nfs4_open_recover(opendata, state);
1158         nfs4_opendata_put(opendata);
1159         return status;
1160 }
1161
1162 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1163 {
1164         struct nfs_server *server = NFS_SERVER(state->inode);
1165         struct nfs4_exception exception = { };
1166         int err;
1167         do {
1168                 err = _nfs4_do_open_reclaim(ctx, state);
1169                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
1170                         break;
1171                 nfs4_handle_exception(server, err, &exception);
1172         } while (exception.retry);
1173         return err;
1174 }
1175
1176 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1177 {
1178         struct nfs_open_context *ctx;
1179         int ret;
1180
1181         ctx = nfs4_state_find_open_context(state);
1182         if (IS_ERR(ctx))
1183                 return PTR_ERR(ctx);
1184         ret = nfs4_do_open_reclaim(ctx, state);
1185         put_nfs_open_context(ctx);
1186         return ret;
1187 }
1188
1189 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1190 {
1191         struct nfs4_opendata *opendata;
1192         int ret;
1193
1194         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1195         if (IS_ERR(opendata))
1196                 return PTR_ERR(opendata);
1197         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1198         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1199                         sizeof(opendata->o_arg.u.delegation.data));
1200         ret = nfs4_open_recover(opendata, state);
1201         nfs4_opendata_put(opendata);
1202         return ret;
1203 }
1204
1205 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1206 {
1207         struct nfs4_exception exception = { };
1208         struct nfs_server *server = NFS_SERVER(state->inode);
1209         int err;
1210         do {
1211                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1212                 switch (err) {
1213                         case 0:
1214                         case -ENOENT:
1215                         case -ESTALE:
1216                                 goto out;
1217                         case -NFS4ERR_BADSESSION:
1218                         case -NFS4ERR_BADSLOT:
1219                         case -NFS4ERR_BAD_HIGH_SLOT:
1220                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1221                         case -NFS4ERR_DEADSESSION:
1222                                 nfs4_schedule_state_recovery(
1223                                         server->nfs_client);
1224                                 goto out;
1225                         case -NFS4ERR_STALE_CLIENTID:
1226                         case -NFS4ERR_STALE_STATEID:
1227                         case -NFS4ERR_EXPIRED:
1228                                 /* Don't recall a delegation if it was lost */
1229                                 nfs4_schedule_state_recovery(server->nfs_client);
1230                                 goto out;
1231                         case -ERESTARTSYS:
1232                                 /*
1233                                  * The show must go on: exit, but mark the
1234                                  * stateid as needing recovery.
1235                                  */
1236                         case -NFS4ERR_ADMIN_REVOKED:
1237                         case -NFS4ERR_BAD_STATEID:
1238                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1239                         case -ENOMEM:
1240                                 err = 0;
1241                                 goto out;
1242                 }
1243                 err = nfs4_handle_exception(server, err, &exception);
1244         } while (exception.retry);
1245 out:
1246         return err;
1247 }
1248
1249 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1250 {
1251         struct nfs4_opendata *data = calldata;
1252
1253         data->rpc_status = task->tk_status;
1254         if (RPC_ASSASSINATED(task))
1255                 return;
1256         if (data->rpc_status == 0) {
1257                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1258                                 sizeof(data->o_res.stateid.data));
1259                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1260                 renew_lease(data->o_res.server, data->timestamp);
1261                 data->rpc_done = 1;
1262         }
1263 }
1264
1265 static void nfs4_open_confirm_release(void *calldata)
1266 {
1267         struct nfs4_opendata *data = calldata;
1268         struct nfs4_state *state = NULL;
1269
1270         /* If this request hasn't been cancelled, do nothing */
1271         if (data->cancelled == 0)
1272                 goto out_free;
1273         /* In case of error, no cleanup! */
1274         if (!data->rpc_done)
1275                 goto out_free;
1276         state = nfs4_opendata_to_nfs4_state(data);
1277         if (!IS_ERR(state))
1278                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1279 out_free:
1280         nfs4_opendata_put(data);
1281 }
1282
1283 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1284         .rpc_call_done = nfs4_open_confirm_done,
1285         .rpc_release = nfs4_open_confirm_release,
1286 };
1287
1288 /*
1289  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1290  */
1291 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1292 {
1293         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1294         struct rpc_task *task;
1295         struct  rpc_message msg = {
1296                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1297                 .rpc_argp = &data->c_arg,
1298                 .rpc_resp = &data->c_res,
1299                 .rpc_cred = data->owner->so_cred,
1300         };
1301         struct rpc_task_setup task_setup_data = {
1302                 .rpc_client = server->client,
1303                 .rpc_message = &msg,
1304                 .callback_ops = &nfs4_open_confirm_ops,
1305                 .callback_data = data,
1306                 .workqueue = nfsiod_workqueue,
1307                 .flags = RPC_TASK_ASYNC,
1308         };
1309         int status;
1310
1311         kref_get(&data->kref);
1312         data->rpc_done = 0;
1313         data->rpc_status = 0;
1314         data->timestamp = jiffies;
1315         task = rpc_run_task(&task_setup_data);
1316         if (IS_ERR(task))
1317                 return PTR_ERR(task);
1318         status = nfs4_wait_for_completion_rpc_task(task);
1319         if (status != 0) {
1320                 data->cancelled = 1;
1321                 smp_wmb();
1322         } else
1323                 status = data->rpc_status;
1324         rpc_put_task(task);
1325         return status;
1326 }
1327
1328 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1329 {
1330         struct nfs4_opendata *data = calldata;
1331         struct nfs4_state_owner *sp = data->owner;
1332
1333         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1334                 return;
1335         /*
1336          * Check if we still need to send an OPEN call, or if we can use
1337          * a delegation instead.
1338          */
1339         if (data->state != NULL) {
1340                 struct nfs_delegation *delegation;
1341
1342                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1343                         goto out_no_action;
1344                 rcu_read_lock();
1345                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1346                 if (delegation != NULL &&
1347                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1348                         rcu_read_unlock();
1349                         goto out_no_action;
1350                 }
1351                 rcu_read_unlock();
1352         }
1353         /* Update sequence id. */
1354         data->o_arg.id = sp->so_owner_id.id;
1355         data->o_arg.clientid = sp->so_client->cl_clientid;
1356         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1357                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1358                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1359         }
1360         data->timestamp = jiffies;
1361         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1362                                 &data->o_arg.seq_args,
1363                                 &data->o_res.seq_res, 1, task))
1364                 return;
1365         rpc_call_start(task);
1366         return;
1367 out_no_action:
1368         task->tk_action = NULL;
1369
1370 }
1371
1372 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1373 {
1374         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1375         nfs4_open_prepare(task, calldata);
1376 }
1377
1378 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1379 {
1380         struct nfs4_opendata *data = calldata;
1381
1382         data->rpc_status = task->tk_status;
1383
1384         nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
1385                         task->tk_status);
1386
1387         if (RPC_ASSASSINATED(task))
1388                 return;
1389         if (task->tk_status == 0) {
1390                 switch (data->o_res.f_attr->mode & S_IFMT) {
1391                         case S_IFREG:
1392                                 break;
1393                         case S_IFLNK:
1394                                 data->rpc_status = -ELOOP;
1395                                 break;
1396                         case S_IFDIR:
1397                                 data->rpc_status = -EISDIR;
1398                                 break;
1399                         default:
1400                                 data->rpc_status = -ENOTDIR;
1401                 }
1402                 renew_lease(data->o_res.server, data->timestamp);
1403                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1404                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1405         }
1406         data->rpc_done = 1;
1407 }
1408
1409 static void nfs4_open_release(void *calldata)
1410 {
1411         struct nfs4_opendata *data = calldata;
1412         struct nfs4_state *state = NULL;
1413
1414         /* If this request hasn't been cancelled, do nothing */
1415         if (data->cancelled == 0)
1416                 goto out_free;
1417         /* In case of error, no cleanup! */
1418         if (data->rpc_status != 0 || !data->rpc_done)
1419                 goto out_free;
1420         /* In case we need an open_confirm, no cleanup! */
1421         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1422                 goto out_free;
1423         state = nfs4_opendata_to_nfs4_state(data);
1424         if (!IS_ERR(state))
1425                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1426 out_free:
1427         nfs4_opendata_put(data);
1428 }
1429
1430 static const struct rpc_call_ops nfs4_open_ops = {
1431         .rpc_call_prepare = nfs4_open_prepare,
1432         .rpc_call_done = nfs4_open_done,
1433         .rpc_release = nfs4_open_release,
1434 };
1435
1436 static const struct rpc_call_ops nfs4_recover_open_ops = {
1437         .rpc_call_prepare = nfs4_recover_open_prepare,
1438         .rpc_call_done = nfs4_open_done,
1439         .rpc_release = nfs4_open_release,
1440 };
1441
1442 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1443 {
1444         struct inode *dir = data->dir->d_inode;
1445         struct nfs_server *server = NFS_SERVER(dir);
1446         struct nfs_openargs *o_arg = &data->o_arg;
1447         struct nfs_openres *o_res = &data->o_res;
1448         struct rpc_task *task;
1449         struct rpc_message msg = {
1450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1451                 .rpc_argp = o_arg,
1452                 .rpc_resp = o_res,
1453                 .rpc_cred = data->owner->so_cred,
1454         };
1455         struct rpc_task_setup task_setup_data = {
1456                 .rpc_client = server->client,
1457                 .rpc_message = &msg,
1458                 .callback_ops = &nfs4_open_ops,
1459                 .callback_data = data,
1460                 .workqueue = nfsiod_workqueue,
1461                 .flags = RPC_TASK_ASYNC,
1462         };
1463         int status;
1464
1465         kref_get(&data->kref);
1466         data->rpc_done = 0;
1467         data->rpc_status = 0;
1468         data->cancelled = 0;
1469         if (isrecover)
1470                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1471         task = rpc_run_task(&task_setup_data);
1472         if (IS_ERR(task))
1473                 return PTR_ERR(task);
1474         status = nfs4_wait_for_completion_rpc_task(task);
1475         if (status != 0) {
1476                 data->cancelled = 1;
1477                 smp_wmb();
1478         } else
1479                 status = data->rpc_status;
1480         rpc_put_task(task);
1481
1482         return status;
1483 }
1484
1485 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1486 {
1487         struct inode *dir = data->dir->d_inode;
1488         struct nfs_openres *o_res = &data->o_res;
1489         int status;
1490
1491         status = nfs4_run_open_task(data, 1);
1492         if (status != 0 || !data->rpc_done)
1493                 return status;
1494
1495         nfs_refresh_inode(dir, o_res->dir_attr);
1496
1497         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1498                 status = _nfs4_proc_open_confirm(data);
1499                 if (status != 0)
1500                         return status;
1501         }
1502
1503         return status;
1504 }
1505
1506 /*
1507  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1508  */
1509 static int _nfs4_proc_open(struct nfs4_opendata *data)
1510 {
1511         struct inode *dir = data->dir->d_inode;
1512         struct nfs_server *server = NFS_SERVER(dir);
1513         struct nfs_openargs *o_arg = &data->o_arg;
1514         struct nfs_openres *o_res = &data->o_res;
1515         int status;
1516
1517         status = nfs4_run_open_task(data, 0);
1518         if (status != 0 || !data->rpc_done)
1519                 return status;
1520
1521         if (o_arg->open_flags & O_CREAT) {
1522                 update_changeattr(dir, &o_res->cinfo);
1523                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1524         } else
1525                 nfs_refresh_inode(dir, o_res->dir_attr);
1526         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1527                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1528         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1529                 status = _nfs4_proc_open_confirm(data);
1530                 if (status != 0)
1531                         return status;
1532         }
1533         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1534                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1535         return 0;
1536 }
1537
1538 static int nfs4_recover_expired_lease(struct nfs_server *server)
1539 {
1540         struct nfs_client *clp = server->nfs_client;
1541         unsigned int loop;
1542         int ret;
1543
1544         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1545                 ret = nfs4_wait_clnt_recover(clp);
1546                 if (ret != 0)
1547                         break;
1548                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1549                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1550                         break;
1551                 nfs4_schedule_state_recovery(clp);
1552                 ret = -EIO;
1553         }
1554         return ret;
1555 }
1556
1557 /*
1558  * OPEN_EXPIRED:
1559  *      reclaim state on the server after a network partition.
1560  *      Assumes caller holds the appropriate lock
1561  */
1562 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1563 {
1564         struct nfs4_opendata *opendata;
1565         int ret;
1566
1567         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1568         if (IS_ERR(opendata))
1569                 return PTR_ERR(opendata);
1570         ret = nfs4_open_recover(opendata, state);
1571         if (ret == -ESTALE)
1572                 d_drop(ctx->path.dentry);
1573         nfs4_opendata_put(opendata);
1574         return ret;
1575 }
1576
1577 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1578 {
1579         struct nfs_server *server = NFS_SERVER(state->inode);
1580         struct nfs4_exception exception = { };
1581         int err;
1582
1583         do {
1584                 err = _nfs4_open_expired(ctx, state);
1585                 switch (err) {
1586                 default:
1587                         goto out;
1588                 case -NFS4ERR_GRACE:
1589                 case -NFS4ERR_DELAY:
1590                 case -EKEYEXPIRED:
1591                         nfs4_handle_exception(server, err, &exception);
1592                         err = 0;
1593                 }
1594         } while (exception.retry);
1595 out:
1596         return err;
1597 }
1598
1599 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1600 {
1601         struct nfs_open_context *ctx;
1602         int ret;
1603
1604         ctx = nfs4_state_find_open_context(state);
1605         if (IS_ERR(ctx))
1606                 return PTR_ERR(ctx);
1607         ret = nfs4_do_open_expired(ctx, state);
1608         put_nfs_open_context(ctx);
1609         return ret;
1610 }
1611
1612 /*
1613  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1614  * fields corresponding to attributes that were used to store the verifier.
1615  * Make sure we clobber those fields in the later setattr call
1616  */
1617 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1618 {
1619         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1620             !(sattr->ia_valid & ATTR_ATIME_SET))
1621                 sattr->ia_valid |= ATTR_ATIME;
1622
1623         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1624             !(sattr->ia_valid & ATTR_MTIME_SET))
1625                 sattr->ia_valid |= ATTR_MTIME;
1626 }
1627
1628 /*
1629  * Returns a referenced nfs4_state
1630  */
1631 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)
1632 {
1633         struct nfs4_state_owner  *sp;
1634         struct nfs4_state     *state = NULL;
1635         struct nfs_server       *server = NFS_SERVER(dir);
1636         struct nfs4_opendata *opendata;
1637         int status;
1638
1639         /* Protect against reboot recovery conflicts */
1640         status = -ENOMEM;
1641         if (!(sp = nfs4_get_state_owner(server, cred))) {
1642                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1643                 goto out_err;
1644         }
1645         status = nfs4_recover_expired_lease(server);
1646         if (status != 0)
1647                 goto err_put_state_owner;
1648         if (path->dentry->d_inode != NULL)
1649                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1650         status = -ENOMEM;
1651         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1652         if (opendata == NULL)
1653                 goto err_put_state_owner;
1654
1655         if (path->dentry->d_inode != NULL)
1656                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1657
1658         status = _nfs4_proc_open(opendata);
1659         if (status != 0)
1660                 goto err_opendata_put;
1661
1662         if (opendata->o_arg.open_flags & O_EXCL)
1663                 nfs4_exclusive_attrset(opendata, sattr);
1664
1665         state = nfs4_opendata_to_nfs4_state(opendata);
1666         status = PTR_ERR(state);
1667         if (IS_ERR(state))
1668                 goto err_opendata_put;
1669         if (server->caps & NFS_CAP_POSIX_LOCK)
1670                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1671         nfs4_opendata_put(opendata);
1672         nfs4_put_state_owner(sp);
1673         *res = state;
1674         return 0;
1675 err_opendata_put:
1676         nfs4_opendata_put(opendata);
1677 err_put_state_owner:
1678         nfs4_put_state_owner(sp);
1679 out_err:
1680         *res = NULL;
1681         return status;
1682 }
1683
1684
1685 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)
1686 {
1687         struct nfs4_exception exception = { };
1688         struct nfs4_state *res;
1689         int status;
1690
1691         do {
1692                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1693                 if (status == 0)
1694                         break;
1695                 /* NOTE: BAD_SEQID means the server and client disagree about the
1696                  * book-keeping w.r.t. state-changing operations
1697                  * (OPEN/CLOSE/LOCK/LOCKU...)
1698                  * It is actually a sign of a bug on the client or on the server.
1699                  *
1700                  * If we receive a BAD_SEQID error in the particular case of
1701                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1702                  * have unhashed the old state_owner for us, and that we can
1703                  * therefore safely retry using a new one. We should still warn
1704                  * the user though...
1705                  */
1706                 if (status == -NFS4ERR_BAD_SEQID) {
1707                         printk(KERN_WARNING "NFS: v4 server %s "
1708                                         " returned a bad sequence-id error!\n",
1709                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1710                         exception.retry = 1;
1711                         continue;
1712                 }
1713                 /*
1714                  * BAD_STATEID on OPEN means that the server cancelled our
1715                  * state before it received the OPEN_CONFIRM.
1716                  * Recover by retrying the request as per the discussion
1717                  * on Page 181 of RFC3530.
1718                  */
1719                 if (status == -NFS4ERR_BAD_STATEID) {
1720                         exception.retry = 1;
1721                         continue;
1722                 }
1723                 if (status == -EAGAIN) {
1724                         /* We must have found a delegation */
1725                         exception.retry = 1;
1726                         continue;
1727                 }
1728                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1729                                         status, &exception));
1730         } while (exception.retry);
1731         return res;
1732 }
1733
1734 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1735                             struct nfs_fattr *fattr, struct iattr *sattr,
1736                             struct nfs4_state *state)
1737 {
1738         struct nfs_server *server = NFS_SERVER(inode);
1739         struct nfs_setattrargs  arg = {
1740                 .fh             = NFS_FH(inode),
1741                 .iap            = sattr,
1742                 .server         = server,
1743                 .bitmask = server->attr_bitmask,
1744         };
1745         struct nfs_setattrres  res = {
1746                 .fattr          = fattr,
1747                 .server         = server,
1748         };
1749         struct rpc_message msg = {
1750                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1751                 .rpc_argp       = &arg,
1752                 .rpc_resp       = &res,
1753                 .rpc_cred       = cred,
1754         };
1755         unsigned long timestamp = jiffies;
1756         int status;
1757
1758         nfs_fattr_init(fattr);
1759
1760         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1761                 /* Use that stateid */
1762         } else if (state != NULL) {
1763                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1764         } else
1765                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1766
1767         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1768         if (status == 0 && state != NULL)
1769                 renew_lease(server, timestamp);
1770         return status;
1771 }
1772
1773 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1774                            struct nfs_fattr *fattr, struct iattr *sattr,
1775                            struct nfs4_state *state)
1776 {
1777         struct nfs_server *server = NFS_SERVER(inode);
1778         struct nfs4_exception exception = { };
1779         int err;
1780         do {
1781                 err = nfs4_handle_exception(server,
1782                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1783                                 &exception);
1784         } while (exception.retry);
1785         return err;
1786 }
1787
1788 struct nfs4_closedata {
1789         struct path path;
1790         struct inode *inode;
1791         struct nfs4_state *state;
1792         struct nfs_closeargs arg;
1793         struct nfs_closeres res;
1794         struct nfs_fattr fattr;
1795         unsigned long timestamp;
1796 };
1797
1798 static void nfs4_free_closedata(void *data)
1799 {
1800         struct nfs4_closedata *calldata = data;
1801         struct nfs4_state_owner *sp = calldata->state->owner;
1802
1803         nfs4_put_open_state(calldata->state);
1804         nfs_free_seqid(calldata->arg.seqid);
1805         nfs4_put_state_owner(sp);
1806         path_put(&calldata->path);
1807         kfree(calldata);
1808 }
1809
1810 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1811                 fmode_t fmode)
1812 {
1813         spin_lock(&state->owner->so_lock);
1814         if (!(fmode & FMODE_READ))
1815                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1816         if (!(fmode & FMODE_WRITE))
1817                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1818         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1819         spin_unlock(&state->owner->so_lock);
1820 }
1821
1822 static void nfs4_close_done(struct rpc_task *task, void *data)
1823 {
1824         struct nfs4_closedata *calldata = data;
1825         struct nfs4_state *state = calldata->state;
1826         struct nfs_server *server = NFS_SERVER(calldata->inode);
1827
1828         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1829         if (RPC_ASSASSINATED(task))
1830                 return;
1831         /* hmm. we are done with the inode, and in the process of freeing
1832          * the state_owner. we keep this around to process errors
1833          */
1834         switch (task->tk_status) {
1835                 case 0:
1836                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1837                         renew_lease(server, calldata->timestamp);
1838                         nfs4_close_clear_stateid_flags(state,
1839                                         calldata->arg.fmode);
1840                         break;
1841                 case -NFS4ERR_STALE_STATEID:
1842                 case -NFS4ERR_OLD_STATEID:
1843                 case -NFS4ERR_BAD_STATEID:
1844                 case -NFS4ERR_EXPIRED:
1845                         if (calldata->arg.fmode == 0)
1846                                 break;
1847                 default:
1848                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1849                                 rpc_restart_call_prepare(task);
1850         }
1851         nfs_release_seqid(calldata->arg.seqid);
1852         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1853 }
1854
1855 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1856 {
1857         struct nfs4_closedata *calldata = data;
1858         struct nfs4_state *state = calldata->state;
1859         int call_close = 0;
1860
1861         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1862                 return;
1863
1864         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1865         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1866         spin_lock(&state->owner->so_lock);
1867         /* Calculate the change in open mode */
1868         if (state->n_rdwr == 0) {
1869                 if (state->n_rdonly == 0) {
1870                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1871                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1872                         calldata->arg.fmode &= ~FMODE_READ;
1873                 }
1874                 if (state->n_wronly == 0) {
1875                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1876                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1877                         calldata->arg.fmode &= ~FMODE_WRITE;
1878                 }
1879         }
1880         spin_unlock(&state->owner->so_lock);
1881
1882         if (!call_close) {
1883                 /* Note: exit _without_ calling nfs4_close_done */
1884                 task->tk_action = NULL;
1885                 return;
1886         }
1887
1888         if (calldata->arg.fmode == 0)
1889                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1890
1891         nfs_fattr_init(calldata->res.fattr);
1892         calldata->timestamp = jiffies;
1893         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1894                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1895                                 1, task))
1896                 return;
1897         rpc_call_start(task);
1898 }
1899
1900 static const struct rpc_call_ops nfs4_close_ops = {
1901         .rpc_call_prepare = nfs4_close_prepare,
1902         .rpc_call_done = nfs4_close_done,
1903         .rpc_release = nfs4_free_closedata,
1904 };
1905
1906 /*
1907  * It is possible for data to be read/written from a mem-mapped file
1908  * after the sys_close call (which hits the vfs layer as a flush).
1909  * This means that we can't safely call nfsv4 close on a file until
1910  * the inode is cleared. This in turn means that we are not good
1911  * NFSv4 citizens - we do not indicate to the server to update the file's
1912  * share state even when we are done with one of the three share
1913  * stateid's in the inode.
1914  *
1915  * NOTE: Caller must be holding the sp->so_owner semaphore!
1916  */
1917 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1918 {
1919         struct nfs_server *server = NFS_SERVER(state->inode);
1920         struct nfs4_closedata *calldata;
1921         struct nfs4_state_owner *sp = state->owner;
1922         struct rpc_task *task;
1923         struct rpc_message msg = {
1924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1925                 .rpc_cred = state->owner->so_cred,
1926         };
1927         struct rpc_task_setup task_setup_data = {
1928                 .rpc_client = server->client,
1929                 .rpc_message = &msg,
1930                 .callback_ops = &nfs4_close_ops,
1931                 .workqueue = nfsiod_workqueue,
1932                 .flags = RPC_TASK_ASYNC,
1933         };
1934         int status = -ENOMEM;
1935
1936         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1937         if (calldata == NULL)
1938                 goto out;
1939         calldata->inode = state->inode;
1940         calldata->state = state;
1941         calldata->arg.fh = NFS_FH(state->inode);
1942         calldata->arg.stateid = &state->open_stateid;
1943         /* Serialization for the sequence id */
1944         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1945         if (calldata->arg.seqid == NULL)
1946                 goto out_free_calldata;
1947         calldata->arg.fmode = 0;
1948         calldata->arg.bitmask = server->cache_consistency_bitmask;
1949         calldata->res.fattr = &calldata->fattr;
1950         calldata->res.seqid = calldata->arg.seqid;
1951         calldata->res.server = server;
1952         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1953         path_get(path);
1954         calldata->path = *path;
1955
1956         msg.rpc_argp = &calldata->arg,
1957         msg.rpc_resp = &calldata->res,
1958         task_setup_data.callback_data = calldata;
1959         task = rpc_run_task(&task_setup_data);
1960         if (IS_ERR(task))
1961                 return PTR_ERR(task);
1962         status = 0;
1963         if (wait)
1964                 status = rpc_wait_for_completion_task(task);
1965         rpc_put_task(task);
1966         return status;
1967 out_free_calldata:
1968         kfree(calldata);
1969 out:
1970         nfs4_put_open_state(state);
1971         nfs4_put_state_owner(sp);
1972         return status;
1973 }
1974
1975 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1976 {
1977         struct file *filp;
1978         int ret;
1979
1980         /* If the open_intent is for execute, we have an extra check to make */
1981         if (fmode & FMODE_EXEC) {
1982                 ret = nfs_may_open(state->inode,
1983                                 state->owner->so_cred,
1984                                 nd->intent.open.flags);
1985                 if (ret < 0)
1986                         goto out_close;
1987         }
1988         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1989         if (!IS_ERR(filp)) {
1990                 struct nfs_open_context *ctx;
1991                 ctx = nfs_file_open_context(filp);
1992                 ctx->state = state;
1993                 return 0;
1994         }
1995         ret = PTR_ERR(filp);
1996 out_close:
1997         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1998         return ret;
1999 }
2000
2001 struct dentry *
2002 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
2003 {
2004         struct path path = {
2005                 .mnt = nd->path.mnt,
2006                 .dentry = dentry,
2007         };
2008         struct dentry *parent;
2009         struct iattr attr;
2010         struct rpc_cred *cred;
2011         struct nfs4_state *state;
2012         struct dentry *res;
2013         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2014
2015         if (nd->flags & LOOKUP_CREATE) {
2016                 attr.ia_mode = nd->intent.open.create_mode;
2017                 attr.ia_valid = ATTR_MODE;
2018                 if (!IS_POSIXACL(dir))
2019                         attr.ia_mode &= ~current_umask();
2020         } else {
2021                 attr.ia_valid = 0;
2022                 BUG_ON(nd->intent.open.flags & O_CREAT);
2023         }
2024
2025         cred = rpc_lookup_cred();
2026         if (IS_ERR(cred))
2027                 return (struct dentry *)cred;
2028         parent = dentry->d_parent;
2029         /* Protect against concurrent sillydeletes */
2030         nfs_block_sillyrename(parent);
2031         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
2032         put_rpccred(cred);
2033         if (IS_ERR(state)) {
2034                 if (PTR_ERR(state) == -ENOENT) {
2035                         d_add(dentry, NULL);
2036                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2037                 }
2038                 nfs_unblock_sillyrename(parent);
2039                 return (struct dentry *)state;
2040         }
2041         res = d_add_unique(dentry, igrab(state->inode));
2042         if (res != NULL)
2043                 path.dentry = res;
2044         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
2045         nfs_unblock_sillyrename(parent);
2046         nfs4_intent_set_file(nd, &path, state, fmode);
2047         return res;
2048 }
2049
2050 int
2051 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
2052 {
2053         struct path path = {
2054                 .mnt = nd->path.mnt,
2055                 .dentry = dentry,
2056         };
2057         struct rpc_cred *cred;
2058         struct nfs4_state *state;
2059         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
2060
2061         cred = rpc_lookup_cred();
2062         if (IS_ERR(cred))
2063                 return PTR_ERR(cred);
2064         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
2065         put_rpccred(cred);
2066         if (IS_ERR(state)) {
2067                 switch (PTR_ERR(state)) {
2068                         case -EPERM:
2069                         case -EACCES:
2070                         case -EDQUOT:
2071                         case -ENOSPC:
2072                         case -EROFS:
2073                                 return PTR_ERR(state);
2074                         default:
2075                                 goto out_drop;
2076                 }
2077         }
2078         if (state->inode == dentry->d_inode) {
2079                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2080                 nfs4_intent_set_file(nd, &path, state, fmode);
2081                 return 1;
2082         }
2083         nfs4_close_sync(&path, state, fmode);
2084 out_drop:
2085         d_drop(dentry);
2086         return 0;
2087 }
2088
2089 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2090 {
2091         if (ctx->state == NULL)
2092                 return;
2093         if (is_sync)
2094                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2095         else
2096                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2097 }
2098
2099 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2100 {
2101         struct nfs4_server_caps_arg args = {
2102                 .fhandle = fhandle,
2103         };
2104         struct nfs4_server_caps_res res = {};
2105         struct rpc_message msg = {
2106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2107                 .rpc_argp = &args,
2108                 .rpc_resp = &res,
2109         };
2110         int status;
2111
2112         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2113         if (status == 0) {
2114                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2115                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2116                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2117                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2118                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2119                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2120                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2121                         server->caps |= NFS_CAP_ACLS;
2122                 if (res.has_links != 0)
2123                         server->caps |= NFS_CAP_HARDLINKS;
2124                 if (res.has_symlinks != 0)
2125                         server->caps |= NFS_CAP_SYMLINKS;
2126                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2127                         server->caps |= NFS_CAP_FILEID;
2128                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2129                         server->caps |= NFS_CAP_MODE;
2130                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2131                         server->caps |= NFS_CAP_NLINK;
2132                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2133                         server->caps |= NFS_CAP_OWNER;
2134                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2135                         server->caps |= NFS_CAP_OWNER_GROUP;
2136                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2137                         server->caps |= NFS_CAP_ATIME;
2138                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2139                         server->caps |= NFS_CAP_CTIME;
2140                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2141                         server->caps |= NFS_CAP_MTIME;
2142
2143                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2144                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2145                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2146                 server->acl_bitmask = res.acl_bitmask;
2147         }
2148
2149         return status;
2150 }
2151
2152 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2153 {
2154         struct nfs4_exception exception = { };
2155         int err;
2156         do {
2157                 err = nfs4_handle_exception(server,
2158                                 _nfs4_server_capabilities(server, fhandle),
2159                                 &exception);
2160         } while (exception.retry);
2161         return err;
2162 }
2163
2164 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2165                 struct nfs_fsinfo *info)
2166 {
2167         struct nfs4_lookup_root_arg args = {
2168                 .bitmask = nfs4_fattr_bitmap,
2169         };
2170         struct nfs4_lookup_res res = {
2171                 .server = server,
2172                 .fattr = info->fattr,
2173                 .fh = fhandle,
2174         };
2175         struct rpc_message msg = {
2176                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2177                 .rpc_argp = &args,
2178                 .rpc_resp = &res,
2179         };
2180
2181         nfs_fattr_init(info->fattr);
2182         return nfs4_call_sync(server, &msg, &args, &res, 0);
2183 }
2184
2185 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2186                 struct nfs_fsinfo *info)
2187 {
2188         struct nfs4_exception exception = { };
2189         int err;
2190         do {
2191                 err = nfs4_handle_exception(server,
2192                                 _nfs4_lookup_root(server, fhandle, info),
2193                                 &exception);
2194         } while (exception.retry);
2195         return err;
2196 }
2197
2198 /*
2199  * get the file handle for the "/" directory on the server
2200  */
2201 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2202                               struct nfs_fsinfo *info)
2203 {
2204         int status;
2205
2206         status = nfs4_lookup_root(server, fhandle, info);
2207         if (status == 0)
2208                 status = nfs4_server_capabilities(server, fhandle);
2209         if (status == 0)
2210                 status = nfs4_do_fsinfo(server, fhandle, info);
2211         return nfs4_map_errors(status);
2212 }
2213
2214 /*
2215  * Get locations and (maybe) other attributes of a referral.
2216  * Note that we'll actually follow the referral later when
2217  * we detect fsid mismatch in inode revalidation
2218  */
2219 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2220 {
2221         int status = -ENOMEM;
2222         struct page *page = NULL;
2223         struct nfs4_fs_locations *locations = NULL;
2224
2225         page = alloc_page(GFP_KERNEL);
2226         if (page == NULL)
2227                 goto out;
2228         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2229         if (locations == NULL)
2230                 goto out;
2231
2232         status = nfs4_proc_fs_locations(dir, name, locations, page);
2233         if (status != 0)
2234                 goto out;
2235         /* Make sure server returned a different fsid for the referral */
2236         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2237                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2238                 status = -EIO;
2239                 goto out;
2240         }
2241
2242         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2243         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2244         if (!fattr->mode)
2245                 fattr->mode = S_IFDIR;
2246         memset(fhandle, 0, sizeof(struct nfs_fh));
2247 out:
2248         if (page)
2249                 __free_page(page);
2250         if (locations)
2251                 kfree(locations);
2252         return status;
2253 }
2254
2255 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2256 {
2257         struct nfs4_getattr_arg args = {
2258                 .fh = fhandle,
2259                 .bitmask = server->attr_bitmask,
2260         };
2261         struct nfs4_getattr_res res = {
2262                 .fattr = fattr,
2263                 .server = server,
2264         };
2265         struct rpc_message msg = {
2266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2267                 .rpc_argp = &args,
2268                 .rpc_resp = &res,
2269         };
2270
2271         nfs_fattr_init(fattr);
2272         return nfs4_call_sync(server, &msg, &args, &res, 0);
2273 }
2274
2275 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2276 {
2277         struct nfs4_exception exception = { };
2278         int err;
2279         do {
2280                 err = nfs4_handle_exception(server,
2281                                 _nfs4_proc_getattr(server, fhandle, fattr),
2282                                 &exception);
2283         } while (exception.retry);
2284         return err;
2285 }
2286
2287 /*
2288  * The file is not closed if it is opened due to the a request to change
2289  * the size of the file. The open call will not be needed once the
2290  * VFS layer lookup-intents are implemented.
2291  *
2292  * Close is called when the inode is destroyed.
2293  * If we haven't opened the file for O_WRONLY, we
2294  * need to in the size_change case to obtain a stateid.
2295  *
2296  * Got race?
2297  * Because OPEN is always done by name in nfsv4, it is
2298  * possible that we opened a different file by the same
2299  * name.  We can recognize this race condition, but we
2300  * can't do anything about it besides returning an error.
2301  *
2302  * This will be fixed with VFS changes (lookup-intent).
2303  */
2304 static int
2305 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2306                   struct iattr *sattr)
2307 {
2308         struct inode *inode = dentry->d_inode;
2309         struct rpc_cred *cred = NULL;
2310         struct nfs4_state *state = NULL;
2311         int status;
2312
2313         nfs_fattr_init(fattr);
2314
2315         /* Search for an existing open(O_WRITE) file */
2316         if (sattr->ia_valid & ATTR_FILE) {
2317                 struct nfs_open_context *ctx;
2318
2319                 ctx = nfs_file_open_context(sattr->ia_file);
2320                 if (ctx) {
2321                         cred = ctx->cred;
2322                         state = ctx->state;
2323                 }
2324         }
2325
2326         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2327         if (status == 0)
2328                 nfs_setattr_update_inode(inode, sattr);
2329         return status;
2330 }
2331
2332 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2333                 const struct qstr *name, struct nfs_fh *fhandle,
2334                 struct nfs_fattr *fattr)
2335 {
2336         int                    status;
2337         struct nfs4_lookup_arg args = {
2338                 .bitmask = server->attr_bitmask,
2339                 .dir_fh = dirfh,
2340                 .name = name,
2341         };
2342         struct nfs4_lookup_res res = {
2343                 .server = server,
2344                 .fattr = fattr,
2345                 .fh = fhandle,
2346         };
2347         struct rpc_message msg = {
2348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2349                 .rpc_argp = &args,
2350                 .rpc_resp = &res,
2351         };
2352
2353         nfs_fattr_init(fattr);
2354
2355         dprintk("NFS call  lookupfh %s\n", name->name);
2356         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2357         dprintk("NFS reply lookupfh: %d\n", status);
2358         return status;
2359 }
2360
2361 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2362                               struct qstr *name, struct nfs_fh *fhandle,
2363                               struct nfs_fattr *fattr)
2364 {
2365         struct nfs4_exception exception = { };
2366         int err;
2367         do {
2368                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2369                 /* FIXME: !!!! */
2370                 if (err == -NFS4ERR_MOVED) {
2371                         err = -EREMOTE;
2372                         break;
2373                 }
2374                 err = nfs4_handle_exception(server, err, &exception);
2375         } while (exception.retry);
2376         return err;
2377 }
2378
2379 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2380                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2381 {
2382         int status;
2383
2384         dprintk("NFS call  lookup %s\n", name->name);
2385         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2386         if (status == -NFS4ERR_MOVED)
2387                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2388         dprintk("NFS reply lookup: %d\n", status);
2389         return status;
2390 }
2391
2392 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2393 {
2394         struct nfs4_exception exception = { };
2395         int err;
2396         do {
2397                 err = nfs4_handle_exception(NFS_SERVER(dir),
2398                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2399                                 &exception);
2400         } while (exception.retry);
2401         return err;
2402 }
2403
2404 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2405 {
2406         struct nfs_server *server = NFS_SERVER(inode);
2407         struct nfs_fattr fattr;
2408         struct nfs4_accessargs args = {
2409                 .fh = NFS_FH(inode),
2410                 .bitmask = server->attr_bitmask,
2411         };
2412         struct nfs4_accessres res = {
2413                 .server = server,
2414                 .fattr = &fattr,
2415         };
2416         struct rpc_message msg = {
2417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2418                 .rpc_argp = &args,
2419                 .rpc_resp = &res,
2420                 .rpc_cred = entry->cred,
2421         };
2422         int mode = entry->mask;
2423         int status;
2424
2425         /*
2426          * Determine which access bits we want to ask for...
2427          */
2428         if (mode & MAY_READ)
2429                 args.access |= NFS4_ACCESS_READ;
2430         if (S_ISDIR(inode->i_mode)) {
2431                 if (mode & MAY_WRITE)
2432                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2433                 if (mode & MAY_EXEC)
2434                         args.access |= NFS4_ACCESS_LOOKUP;
2435         } else {
2436                 if (mode & MAY_WRITE)
2437                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2438                 if (mode & MAY_EXEC)
2439                         args.access |= NFS4_ACCESS_EXECUTE;
2440         }
2441         nfs_fattr_init(&fattr);
2442         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2443         if (!status) {
2444                 entry->mask = 0;
2445                 if (res.access & NFS4_ACCESS_READ)
2446                         entry->mask |= MAY_READ;
2447                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2448                         entry->mask |= MAY_WRITE;
2449                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2450                         entry->mask |= MAY_EXEC;
2451                 nfs_refresh_inode(inode, &fattr);
2452         }
2453         return status;
2454 }
2455
2456 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2457 {
2458         struct nfs4_exception exception = { };
2459         int err;
2460         do {
2461                 err = nfs4_handle_exception(NFS_SERVER(inode),
2462                                 _nfs4_proc_access(inode, entry),
2463                                 &exception);
2464         } while (exception.retry);
2465         return err;
2466 }
2467
2468 /*
2469  * TODO: For the time being, we don't try to get any attributes
2470  * along with any of the zero-copy operations READ, READDIR,
2471  * READLINK, WRITE.
2472  *
2473  * In the case of the first three, we want to put the GETATTR
2474  * after the read-type operation -- this is because it is hard
2475  * to predict the length of a GETATTR response in v4, and thus
2476  * align the READ data correctly.  This means that the GETATTR
2477  * may end up partially falling into the page cache, and we should
2478  * shift it into the 'tail' of the xdr_buf before processing.
2479  * To do this efficiently, we need to know the total length
2480  * of data received, which doesn't seem to be available outside
2481  * of the RPC layer.
2482  *
2483  * In the case of WRITE, we also want to put the GETATTR after
2484  * the operation -- in this case because we want to make sure
2485  * we get the post-operation mtime and size.  This means that
2486  * we can't use xdr_encode_pages() as written: we need a variant
2487  * of it which would leave room in the 'tail' iovec.
2488  *
2489  * Both of these changes to the XDR layer would in fact be quite
2490  * minor, but I decided to leave them for a subsequent patch.
2491  */
2492 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2493                 unsigned int pgbase, unsigned int pglen)
2494 {
2495         struct nfs4_readlink args = {
2496                 .fh       = NFS_FH(inode),
2497                 .pgbase   = pgbase,
2498                 .pglen    = pglen,
2499                 .pages    = &page,
2500         };
2501         struct nfs4_readlink_res res;
2502         struct rpc_message msg = {
2503                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2504                 .rpc_argp = &args,
2505                 .rpc_resp = &res,
2506         };
2507
2508         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2509 }
2510
2511 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2512                 unsigned int pgbase, unsigned int pglen)
2513 {
2514         struct nfs4_exception exception = { };
2515         int err;
2516         do {
2517                 err = nfs4_handle_exception(NFS_SERVER(inode),
2518                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2519                                 &exception);
2520         } while (exception.retry);
2521         return err;
2522 }
2523
2524 /*
2525  * Got race?
2526  * We will need to arrange for the VFS layer to provide an atomic open.
2527  * Until then, this create/open method is prone to inefficiency and race
2528  * conditions due to the lookup, create, and open VFS calls from sys_open()
2529  * placed on the wire.
2530  *
2531  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2532  * The file will be opened again in the subsequent VFS open call
2533  * (nfs4_proc_file_open).
2534  *
2535  * The open for read will just hang around to be used by any process that
2536  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2537  */
2538
2539 static int
2540 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2541                  int flags, struct nameidata *nd)
2542 {
2543         struct path path = {
2544                 .mnt = nd->path.mnt,
2545                 .dentry = dentry,
2546         };
2547         struct nfs4_state *state;
2548         struct rpc_cred *cred;
2549         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2550         int status = 0;
2551
2552         cred = rpc_lookup_cred();
2553         if (IS_ERR(cred)) {
2554                 status = PTR_ERR(cred);
2555                 goto out;
2556         }
2557         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2558         d_drop(dentry);
2559         if (IS_ERR(state)) {
2560                 status = PTR_ERR(state);
2561                 goto out_putcred;
2562         }
2563         d_add(dentry, igrab(state->inode));
2564         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2565         if (flags & O_EXCL) {
2566                 struct nfs_fattr fattr;
2567                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2568                 if (status == 0)
2569                         nfs_setattr_update_inode(state->inode, sattr);
2570                 nfs_post_op_update_inode(state->inode, &fattr);
2571         }
2572         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2573                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2574         else
2575                 nfs4_close_sync(&path, state, fmode);
2576 out_putcred:
2577         put_rpccred(cred);
2578 out:
2579         return status;
2580 }
2581
2582 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2583 {
2584         struct nfs_server *server = NFS_SERVER(dir);
2585         struct nfs_removeargs args = {
2586                 .fh = NFS_FH(dir),
2587                 .name.len = name->len,
2588                 .name.name = name->name,
2589                 .bitmask = server->attr_bitmask,
2590         };
2591         struct nfs_removeres res = {
2592                 .server = server,
2593         };
2594         struct rpc_message msg = {
2595                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2596                 .rpc_argp = &args,
2597                 .rpc_resp = &res,
2598         };
2599         int                     status;
2600
2601         nfs_fattr_init(&res.dir_attr);
2602         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2603         if (status == 0) {
2604                 update_changeattr(dir, &res.cinfo);
2605                 nfs_post_op_update_inode(dir, &res.dir_attr);
2606         }
2607         return status;
2608 }
2609
2610 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2611 {
2612         struct nfs4_exception exception = { };
2613         int err;
2614         do {
2615                 err = nfs4_handle_exception(NFS_SERVER(dir),
2616                                 _nfs4_proc_remove(dir, name),
2617                                 &exception);
2618         } while (exception.retry);
2619         return err;
2620 }
2621
2622 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2623 {
2624         struct nfs_server *server = NFS_SERVER(dir);
2625         struct nfs_removeargs *args = msg->rpc_argp;
2626         struct nfs_removeres *res = msg->rpc_resp;
2627
2628         args->bitmask = server->cache_consistency_bitmask;
2629         res->server = server;
2630         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2631 }
2632
2633 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2634 {
2635         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2636
2637         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2638         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2639                 return 0;
2640         update_changeattr(dir, &res->cinfo);
2641         nfs_post_op_update_inode(dir, &res->dir_attr);
2642         return 1;
2643 }
2644
2645 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2646                 struct inode *new_dir, struct qstr *new_name)
2647 {
2648         struct nfs_server *server = NFS_SERVER(old_dir);
2649         struct nfs4_rename_arg arg = {
2650                 .old_dir = NFS_FH(old_dir),
2651                 .new_dir = NFS_FH(new_dir),
2652                 .old_name = old_name,
2653                 .new_name = new_name,
2654                 .bitmask = server->attr_bitmask,
2655         };
2656         struct nfs_fattr old_fattr, new_fattr;
2657         struct nfs4_rename_res res = {
2658                 .server = server,
2659                 .old_fattr = &old_fattr,
2660                 .new_fattr = &new_fattr,
2661         };
2662         struct rpc_message msg = {
2663                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2664                 .rpc_argp = &arg,
2665                 .rpc_resp = &res,
2666         };
2667         int                     status;
2668
2669         nfs_fattr_init(res.old_fattr);
2670         nfs_fattr_init(res.new_fattr);
2671         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2672
2673         if (!status) {
2674                 update_changeattr(old_dir, &res.old_cinfo);
2675                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2676                 update_changeattr(new_dir, &res.new_cinfo);
2677                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2678         }
2679         return status;
2680 }
2681
2682 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2683                 struct inode *new_dir, struct qstr *new_name)
2684 {
2685         struct nfs4_exception exception = { };
2686         int err;
2687         do {
2688                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2689                                 _nfs4_proc_rename(old_dir, old_name,
2690                                         new_dir, new_name),
2691                                 &exception);
2692         } while (exception.retry);
2693         return err;
2694 }
2695
2696 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2697 {
2698         struct nfs_server *server = NFS_SERVER(inode);
2699         struct nfs4_link_arg arg = {
2700                 .fh     = NFS_FH(inode),
2701                 .dir_fh = NFS_FH(dir),
2702                 .name   = name,
2703                 .bitmask = server->attr_bitmask,
2704         };
2705         struct nfs_fattr fattr, dir_attr;
2706         struct nfs4_link_res res = {
2707                 .server = server,
2708                 .fattr = &fattr,
2709                 .dir_attr = &dir_attr,
2710         };
2711         struct rpc_message msg = {
2712                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2713                 .rpc_argp = &arg,
2714                 .rpc_resp = &res,
2715         };
2716         int                     status;
2717
2718         nfs_fattr_init(res.fattr);
2719         nfs_fattr_init(res.dir_attr);
2720         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2721         if (!status) {
2722                 update_changeattr(dir, &res.cinfo);
2723                 nfs_post_op_update_inode(dir, res.dir_attr);
2724                 nfs_post_op_update_inode(inode, res.fattr);
2725         }
2726
2727         return status;
2728 }
2729
2730 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2731 {
2732         struct nfs4_exception exception = { };
2733         int err;
2734         do {
2735                 err = nfs4_handle_exception(NFS_SERVER(inode),
2736                                 _nfs4_proc_link(inode, dir, name),
2737                                 &exception);
2738         } while (exception.retry);
2739         return err;
2740 }
2741
2742 struct nfs4_createdata {
2743         struct rpc_message msg;
2744         struct nfs4_create_arg arg;
2745         struct nfs4_create_res res;
2746         struct nfs_fh fh;
2747         struct nfs_fattr fattr;
2748         struct nfs_fattr dir_fattr;
2749 };
2750
2751 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2752                 struct qstr *name, struct iattr *sattr, u32 ftype)
2753 {
2754         struct nfs4_createdata *data;
2755
2756         data = kzalloc(sizeof(*data), GFP_KERNEL);
2757         if (data != NULL) {
2758                 struct nfs_server *server = NFS_SERVER(dir);
2759
2760                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2761                 data->msg.rpc_argp = &data->arg;
2762                 data->msg.rpc_resp = &data->res;
2763                 data->arg.dir_fh = NFS_FH(dir);
2764                 data->arg.server = server;
2765                 data->arg.name = name;
2766                 data->arg.attrs = sattr;
2767                 data->arg.ftype = ftype;
2768                 data->arg.bitmask = server->attr_bitmask;
2769                 data->res.server = server;
2770                 data->res.fh = &data->fh;
2771                 data->res.fattr = &data->fattr;
2772                 data->res.dir_fattr = &data->dir_fattr;
2773                 nfs_fattr_init(data->res.fattr);
2774                 nfs_fattr_init(data->res.dir_fattr);
2775         }
2776         return data;
2777 }
2778
2779 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2780 {
2781         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2782                                     &data->arg, &data->res, 1);
2783         if (status == 0) {
2784                 update_changeattr(dir, &data->res.dir_cinfo);
2785                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2786                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2787         }
2788         return status;
2789 }
2790
2791 static void nfs4_free_createdata(struct nfs4_createdata *data)
2792 {
2793         kfree(data);
2794 }
2795
2796 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2797                 struct page *page, unsigned int len, struct iattr *sattr)
2798 {
2799         struct nfs4_createdata *data;
2800         int status = -ENAMETOOLONG;
2801
2802         if (len > NFS4_MAXPATHLEN)
2803                 goto out;
2804
2805         status = -ENOMEM;
2806         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2807         if (data == NULL)
2808                 goto out;
2809
2810         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2811         data->arg.u.symlink.pages = &page;
2812         data->arg.u.symlink.len = len;
2813
2814         status = nfs4_do_create(dir, dentry, data);
2815
2816         nfs4_free_createdata(data);
2817 out:
2818         return status;
2819 }
2820
2821 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2822                 struct page *page, unsigned int len, struct iattr *sattr)
2823 {
2824         struct nfs4_exception exception = { };
2825         int err;
2826         do {
2827                 err = nfs4_handle_exception(NFS_SERVER(dir),
2828                                 _nfs4_proc_symlink(dir, dentry, page,
2829                                                         len, sattr),
2830                                 &exception);
2831         } while (exception.retry);
2832         return err;
2833 }
2834
2835 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2836                 struct iattr *sattr)
2837 {
2838         struct nfs4_createdata *data;
2839         int status = -ENOMEM;
2840
2841         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2842         if (data == NULL)
2843                 goto out;
2844
2845         status = nfs4_do_create(dir, dentry, data);
2846
2847         nfs4_free_createdata(data);
2848 out:
2849         return status;
2850 }
2851
2852 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2853                 struct iattr *sattr)
2854 {
2855         struct nfs4_exception exception = { };
2856         int err;
2857         do {
2858                 err = nfs4_handle_exception(NFS_SERVER(dir),
2859                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2860                                 &exception);
2861         } while (exception.retry);
2862         return err;
2863 }
2864
2865 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2866                   u64 cookie, struct page *page, unsigned int count, int plus)
2867 {
2868         struct inode            *dir = dentry->d_inode;
2869         struct nfs4_readdir_arg args = {
2870                 .fh = NFS_FH(dir),
2871                 .pages = &page,
2872                 .pgbase = 0,
2873                 .count = count,
2874                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2875         };
2876         struct nfs4_readdir_res res;
2877         struct rpc_message msg = {
2878                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2879                 .rpc_argp = &args,
2880                 .rpc_resp = &res,
2881                 .rpc_cred = cred,
2882         };
2883         int                     status;
2884
2885         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2886                         dentry->d_parent->d_name.name,
2887                         dentry->d_name.name,
2888                         (unsigned long long)cookie);
2889         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2890         res.pgbase = args.pgbase;
2891         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2892         if (status == 0)
2893                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2894
2895         nfs_invalidate_atime(dir);
2896
2897         dprintk("%s: returns %d\n", __func__, status);
2898         return status;
2899 }
2900
2901 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2902                   u64 cookie, struct page *page, unsigned int count, int plus)
2903 {
2904         struct nfs4_exception exception = { };
2905         int err;
2906         do {
2907                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2908                                 _nfs4_proc_readdir(dentry, cred, cookie,
2909                                         page, count, plus),
2910                                 &exception);
2911         } while (exception.retry);
2912         return err;
2913 }
2914
2915 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2916                 struct iattr *sattr, dev_t rdev)
2917 {
2918         struct nfs4_createdata *data;
2919         int mode = sattr->ia_mode;
2920         int status = -ENOMEM;
2921
2922         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2923         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2924
2925         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2926         if (data == NULL)
2927                 goto out;
2928
2929         if (S_ISFIFO(mode))
2930                 data->arg.ftype = NF4FIFO;
2931         else if (S_ISBLK(mode)) {
2932                 data->arg.ftype = NF4BLK;
2933                 data->arg.u.device.specdata1 = MAJOR(rdev);
2934                 data->arg.u.device.specdata2 = MINOR(rdev);
2935         }
2936         else if (S_ISCHR(mode)) {
2937                 data->arg.ftype = NF4CHR;
2938                 data->arg.u.device.specdata1 = MAJOR(rdev);
2939                 data->arg.u.device.specdata2 = MINOR(rdev);
2940         }
2941
2942         status = nfs4_do_create(dir, dentry, data);
2943
2944         nfs4_free_createdata(data);
2945 out:
2946         return status;
2947 }
2948
2949 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2950                 struct iattr *sattr, dev_t rdev)
2951 {
2952         struct nfs4_exception exception = { };
2953         int err;
2954         do {
2955                 err = nfs4_handle_exception(NFS_SERVER(dir),
2956                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2957                                 &exception);
2958         } while (exception.retry);
2959         return err;
2960 }
2961
2962 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2963                  struct nfs_fsstat *fsstat)
2964 {
2965         struct nfs4_statfs_arg args = {
2966                 .fh = fhandle,
2967                 .bitmask = server->attr_bitmask,
2968         };
2969         struct nfs4_statfs_res res = {
2970                 .fsstat = fsstat,
2971         };
2972         struct rpc_message msg = {
2973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2974                 .rpc_argp = &args,
2975                 .rpc_resp = &res,
2976         };
2977
2978         nfs_fattr_init(fsstat->fattr);
2979         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2980 }
2981
2982 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2983 {
2984         struct nfs4_exception exception = { };
2985         int err;
2986         do {
2987                 err = nfs4_handle_exception(server,
2988                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2989                                 &exception);
2990         } while (exception.retry);
2991         return err;
2992 }
2993
2994 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2995                 struct nfs_fsinfo *fsinfo)
2996 {
2997         struct nfs4_fsinfo_arg args = {
2998                 .fh = fhandle,
2999                 .bitmask = server->attr_bitmask,
3000         };
3001         struct nfs4_fsinfo_res res = {
3002                 .fsinfo = fsinfo,
3003         };
3004         struct rpc_message msg = {
3005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3006                 .rpc_argp = &args,
3007                 .rpc_resp = &res,
3008         };
3009
3010         return nfs4_call_sync(server, &msg, &args, &res, 0);
3011 }
3012
3013 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3014 {
3015         struct nfs4_exception exception = { };
3016         int err;
3017
3018         do {
3019                 err = nfs4_handle_exception(server,
3020                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3021                                 &exception);
3022         } while (exception.retry);
3023         return err;
3024 }
3025
3026 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3027 {
3028         nfs_fattr_init(fsinfo->fattr);
3029         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3030 }
3031
3032 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3033                 struct nfs_pathconf *pathconf)
3034 {
3035         struct nfs4_pathconf_arg args = {
3036                 .fh = fhandle,
3037                 .bitmask = server->attr_bitmask,
3038         };
3039         struct nfs4_pathconf_res res = {
3040                 .pathconf = pathconf,
3041         };
3042         struct rpc_message msg = {
3043                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3044                 .rpc_argp = &args,
3045                 .rpc_resp = &res,
3046         };
3047
3048         /* None of the pathconf attributes are mandatory to implement */
3049         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3050                 memset(pathconf, 0, sizeof(*pathconf));
3051                 return 0;
3052         }
3053
3054         nfs_fattr_init(pathconf->fattr);
3055         return nfs4_call_sync(server, &msg, &args, &res, 0);
3056 }
3057
3058 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3059                 struct nfs_pathconf *pathconf)
3060 {
3061         struct nfs4_exception exception = { };
3062         int err;
3063
3064         do {
3065                 err = nfs4_handle_exception(server,
3066                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3067                                 &exception);
3068         } while (exception.retry);
3069         return err;
3070 }
3071
3072 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3073 {
3074         struct nfs_server *server = NFS_SERVER(data->inode);
3075
3076         dprintk("--> %s\n", __func__);
3077
3078         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
3079
3080         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3081                 nfs_restart_rpc(task, server->nfs_client);
3082                 return -EAGAIN;
3083         }
3084
3085         nfs_invalidate_atime(data->inode);
3086         if (task->tk_status > 0)
3087                 renew_lease(server, data->timestamp);
3088         return 0;
3089 }
3090
3091 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3092 {
3093         data->timestamp   = jiffies;
3094         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3095 }
3096
3097 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3098 {
3099         struct inode *inode = data->inode;
3100
3101         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3102                            task->tk_status);
3103
3104         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3105                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3106                 return -EAGAIN;
3107         }
3108         if (task->tk_status >= 0) {
3109                 renew_lease(NFS_SERVER(inode), data->timestamp);
3110                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3111         }
3112         return 0;
3113 }
3114
3115 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3116 {
3117         struct nfs_server *server = NFS_SERVER(data->inode);
3118
3119         data->args.bitmask = server->cache_consistency_bitmask;
3120         data->res.server = server;
3121         data->timestamp   = jiffies;
3122
3123         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3124 }
3125
3126 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3127 {
3128         struct inode *inode = data->inode;
3129
3130         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3131                            task->tk_status);
3132         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3133                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3134                 return -EAGAIN;
3135         }
3136         nfs_refresh_inode(inode, data->res.fattr);
3137         return 0;
3138 }
3139
3140 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3141 {
3142         struct nfs_server *server = NFS_SERVER(data->inode);
3143
3144         data->args.bitmask = server->cache_consistency_bitmask;
3145         data->res.server = server;
3146         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3147 }
3148
3149 /*
3150  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3151  * standalone procedure for queueing an asynchronous RENEW.
3152  */
3153 static void nfs4_renew_release(void *data)
3154 {
3155         struct nfs_client *clp = data;
3156
3157         if (atomic_read(&clp->cl_count) > 1)
3158                 nfs4_schedule_state_renewal(clp);
3159         nfs_put_client(clp);
3160 }
3161
3162 static void nfs4_renew_done(struct rpc_task *task, void *data)
3163 {
3164         struct nfs_client *clp = data;
3165         unsigned long timestamp = task->tk_start;
3166
3167         if (task->tk_status < 0) {
3168                 /* Unless we're shutting down, schedule state recovery! */
3169                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3170                         nfs4_schedule_state_recovery(clp);
3171                 return;
3172         }
3173         spin_lock(&clp->cl_lock);
3174         if (time_before(clp->cl_last_renewal,timestamp))
3175                 clp->cl_last_renewal = timestamp;
3176         spin_unlock(&clp->cl_lock);
3177 }
3178
3179 static const struct rpc_call_ops nfs4_renew_ops = {
3180         .rpc_call_done = nfs4_renew_done,
3181         .rpc_release = nfs4_renew_release,
3182 };
3183
3184 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3185 {
3186         struct rpc_message msg = {
3187                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3188                 .rpc_argp       = clp,
3189                 .rpc_cred       = cred,
3190         };
3191
3192         if (!atomic_inc_not_zero(&clp->cl_count))
3193                 return -EIO;
3194         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3195                         &nfs4_renew_ops, clp);
3196 }
3197
3198 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3199 {
3200         struct rpc_message msg = {
3201                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3202                 .rpc_argp       = clp,
3203                 .rpc_cred       = cred,
3204         };
3205         unsigned long now = jiffies;
3206         int status;
3207
3208         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3209         if (status < 0)
3210                 return status;
3211         spin_lock(&clp->cl_lock);
3212         if (time_before(clp->cl_last_renewal,now))
3213                 clp->cl_last_renewal = now;
3214         spin_unlock(&clp->cl_lock);
3215         return 0;
3216 }
3217
3218 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3219 {
3220         return (server->caps & NFS_CAP_ACLS)
3221                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3222                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3223 }
3224
3225 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3226  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3227  * the stack.
3228  */
3229 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3230
3231 static void buf_to_pages(const void *buf, size_t buflen,
3232                 struct page **pages, unsigned int *pgbase)
3233 {
3234         const void *p = buf;
3235
3236         *pgbase = offset_in_page(buf);
3237         p -= *pgbase;
3238         while (p < buf + buflen) {
3239                 *(pages++) = virt_to_page(p);
3240                 p += PAGE_CACHE_SIZE;
3241         }
3242 }
3243
3244 struct nfs4_cached_acl {
3245         int cached;
3246         size_t len;
3247         char data[0];
3248 };
3249
3250 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3251 {
3252         struct nfs_inode *nfsi = NFS_I(inode);
3253
3254         spin_lock(&inode->i_lock);
3255         kfree(nfsi->nfs4_acl);
3256         nfsi->nfs4_acl = acl;
3257         spin_unlock(&inode->i_lock);
3258 }
3259
3260 static void nfs4_zap_acl_attr(struct inode *inode)
3261 {
3262         nfs4_set_cached_acl(inode, NULL);
3263 }
3264
3265 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3266 {
3267         struct nfs_inode *nfsi = NFS_I(inode);
3268         struct nfs4_cached_acl *acl;
3269         int ret = -ENOENT;
3270
3271         spin_lock(&inode->i_lock);
3272         acl = nfsi->nfs4_acl;
3273         if (acl == NULL)
3274                 goto out;
3275         if (buf == NULL) /* user is just asking for length */
3276                 goto out_len;
3277         if (acl->cached == 0)
3278                 goto out;
3279         ret = -ERANGE; /* see getxattr(2) man page */
3280         if (acl->len > buflen)
3281                 goto out;
3282         memcpy(buf, acl->data, acl->len);
3283 out_len:
3284         ret = acl->len;
3285 out:
3286         spin_unlock(&inode->i_lock);
3287         return ret;
3288 }
3289
3290 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3291 {
3292         struct nfs4_cached_acl *acl;
3293
3294         if (buf && acl_len <= PAGE_SIZE) {
3295                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3296                 if (acl == NULL)
3297                         goto out;
3298                 acl->cached = 1;
3299                 memcpy(acl->data, buf, acl_len);
3300         } else {
3301                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3302                 if (acl == NULL)
3303                         goto out;
3304                 acl->cached = 0;
3305         }
3306         acl->len = acl_len;
3307 out:
3308         nfs4_set_cached_acl(inode, acl);
3309 }
3310
3311 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3312 {
3313         struct page *pages[NFS4ACL_MAXPAGES];
3314         struct nfs_getaclargs args = {
3315                 .fh = NFS_FH(inode),
3316                 .acl_pages = pages,
3317                 .acl_len = buflen,
3318         };
3319         struct nfs_getaclres res = {
3320                 .acl_len = buflen,
3321         };
3322         void *resp_buf;
3323         struct rpc_message msg = {
3324                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3325                 .rpc_argp = &args,
3326                 .rpc_resp = &res,
3327         };
3328         struct page *localpage = NULL;
3329         int ret;
3330
3331         if (buflen < PAGE_SIZE) {
3332                 /* As long as we're doing a round trip to the server anyway,
3333                  * let's be prepared for a page of acl data. */
3334                 localpage = alloc_page(GFP_KERNEL);
3335                 resp_buf = page_address(localpage);
3336                 if (localpage == NULL)
3337                         return -ENOMEM;
3338                 args.acl_pages[0] = localpage;
3339                 args.acl_pgbase = 0;
3340                 args.acl_len = PAGE_SIZE;
3341         } else {
3342                 resp_buf = buf;
3343                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3344         }
3345         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3346         if (ret)
3347                 goto out_free;
3348         if (res.acl_len > args.acl_len)
3349                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3350         else
3351                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3352         if (buf) {
3353                 ret = -ERANGE;
3354                 if (res.acl_len > buflen)
3355                         goto out_free;
3356                 if (localpage)
3357                         memcpy(buf, resp_buf, res.acl_len);
3358         }
3359         ret = res.acl_len;
3360 out_free:
3361         if (localpage)
3362                 __free_page(localpage);
3363         return ret;
3364 }
3365
3366 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3367 {
3368         struct nfs4_exception exception = { };
3369         ssize_t ret;
3370         do {
3371                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3372                 if (ret >= 0)
3373                         break;
3374                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3375         } while (exception.retry);
3376         return ret;
3377 }
3378
3379 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3380 {
3381         struct nfs_server *server = NFS_SERVER(inode);
3382         int ret;
3383
3384         if (!nfs4_server_supports_acls(server))
3385                 return -EOPNOTSUPP;
3386         ret = nfs_revalidate_inode(server, inode);
3387         if (ret < 0)
3388                 return ret;
3389         ret = nfs4_read_cached_acl(inode, buf, buflen);
3390         if (ret != -ENOENT)
3391                 return ret;
3392         return nfs4_get_acl_uncached(inode, buf, buflen);
3393 }
3394
3395 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3396 {
3397         struct nfs_server *server = NFS_SERVER(inode);
3398         struct page *pages[NFS4ACL_MAXPAGES];
3399         struct nfs_setaclargs arg = {
3400                 .fh             = NFS_FH(inode),
3401                 .acl_pages      = pages,
3402                 .acl_len        = buflen,
3403         };
3404         struct nfs_setaclres res;
3405         struct rpc_message msg = {
3406                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3407                 .rpc_argp       = &arg,
3408                 .rpc_resp       = &res,
3409         };
3410         int ret;
3411
3412         if (!nfs4_server_supports_acls(server))
3413                 return -EOPNOTSUPP;
3414         nfs_inode_return_delegation(inode);
3415         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3416         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3417         nfs_access_zap_cache(inode);
3418         nfs_zap_acl_cache(inode);
3419         return ret;
3420 }
3421
3422 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3423 {
3424         struct nfs4_exception exception = { };
3425         int err;
3426         do {
3427                 err = nfs4_handle_exception(NFS_SERVER(inode),
3428                                 __nfs4_proc_set_acl(inode, buf, buflen),
3429                                 &exception);
3430         } while (exception.retry);
3431         return err;
3432 }
3433
3434 static int
3435 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3436 {
3437         if (!clp || task->tk_status >= 0)
3438                 return 0;
3439         switch(task->tk_status) {
3440                 case -NFS4ERR_ADMIN_REVOKED:
3441                 case -NFS4ERR_BAD_STATEID:
3442                 case -NFS4ERR_OPENMODE:
3443                         if (state == NULL)
3444                                 break;
3445                         nfs4_state_mark_reclaim_nograce(clp, state);
3446                         goto do_state_recovery;
3447                 case -NFS4ERR_STALE_STATEID:
3448                         if (state == NULL)
3449                                 break;
3450                         nfs4_state_mark_reclaim_reboot(clp, state);
3451                 case -NFS4ERR_STALE_CLIENTID:
3452                 case -NFS4ERR_EXPIRED:
3453                         goto do_state_recovery;
3454 #if defined(CONFIG_NFS_V4_1)
3455                 case -NFS4ERR_BADSESSION:
3456                 case -NFS4ERR_BADSLOT:
3457                 case -NFS4ERR_BAD_HIGH_SLOT:
3458                 case -NFS4ERR_DEADSESSION:
3459                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3460                 case -NFS4ERR_SEQ_FALSE_RETRY:
3461                 case -NFS4ERR_SEQ_MISORDERED:
3462                         dprintk("%s ERROR %d, Reset session\n", __func__,
3463                                 task->tk_status);
3464                         nfs4_schedule_state_recovery(clp);
3465                         task->tk_status = 0;
3466                         return -EAGAIN;
3467 #endif /* CONFIG_NFS_V4_1 */
3468                 case -NFS4ERR_DELAY:
3469                         if (server)
3470                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3471                 case -NFS4ERR_GRACE:
3472                 case -EKEYEXPIRED:
3473                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3474                         task->tk_status = 0;
3475                         return -EAGAIN;
3476                 case -NFS4ERR_OLD_STATEID:
3477                         task->tk_status = 0;
3478                         return -EAGAIN;
3479         }
3480         task->tk_status = nfs4_map_errors(task->tk_status);
3481         return 0;
3482 do_state_recovery:
3483         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3484         nfs4_schedule_state_recovery(clp);
3485         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3486                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3487         task->tk_status = 0;
3488         return -EAGAIN;
3489 }
3490
3491 static int
3492 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3493 {
3494         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3495 }
3496
3497 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3498 {
3499         nfs4_verifier sc_verifier;
3500         struct nfs4_setclientid setclientid = {
3501                 .sc_verifier = &sc_verifier,
3502                 .sc_prog = program,
3503         };
3504         struct rpc_message msg = {
3505                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3506                 .rpc_argp = &setclientid,
3507                 .rpc_resp = clp,
3508                 .rpc_cred = cred,
3509         };
3510         __be32 *p;
3511         int loop = 0;
3512         int status;
3513
3514         p = (__be32*)sc_verifier.data;
3515         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3516         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3517
3518         for(;;) {
3519                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3520                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3521                                 clp->cl_ipaddr,
3522                                 rpc_peeraddr2str(clp->cl_rpcclient,
3523                                                         RPC_DISPLAY_ADDR),
3524                                 rpc_peeraddr2str(clp->cl_rpcclient,
3525                                                         RPC_DISPLAY_PROTO),
3526                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3527                                 clp->cl_id_uniquifier);
3528                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3529                                 sizeof(setclientid.sc_netid),
3530                                 rpc_peeraddr2str(clp->cl_rpcclient,
3531                                                         RPC_DISPLAY_NETID));
3532                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3533                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3534                                 clp->cl_ipaddr, port >> 8, port & 255);
3535
3536                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3537                 if (status != -NFS4ERR_CLID_INUSE)
3538                         break;
3539                 if (signalled())
3540                         break;
3541                 if (loop++ & 1)
3542                         ssleep(clp->cl_lease_time + 1);
3543                 else
3544                         if (++clp->cl_id_uniquifier == 0)
3545                                 break;
3546         }
3547         return status;
3548 }
3549
3550 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3551 {
3552         struct nfs_fsinfo fsinfo;
3553         struct rpc_message msg = {
3554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3555                 .rpc_argp = clp,
3556                 .rpc_resp = &fsinfo,
3557                 .rpc_cred = cred,
3558         };
3559         unsigned long now;
3560         int status;
3561
3562         now = jiffies;
3563         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3564         if (status == 0) {
3565                 spin_lock(&clp->cl_lock);
3566                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3567                 clp->cl_last_renewal = now;
3568                 spin_unlock(&clp->cl_lock);
3569         }
3570         return status;
3571 }
3572
3573 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3574 {
3575         long timeout = 0;
3576         int err;
3577         do {
3578                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3579                 switch (err) {
3580                         case 0:
3581                                 return err;
3582                         case -NFS4ERR_RESOURCE:
3583                                 /* The IBM lawyers misread another document! */
3584                         case -NFS4ERR_DELAY:
3585                         case -EKEYEXPIRED:
3586                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3587                 }
3588         } while (err == 0);
3589         return err;
3590 }
3591
3592 struct nfs4_delegreturndata {
3593         struct nfs4_delegreturnargs args;
3594         struct nfs4_delegreturnres res;
3595         struct nfs_fh fh;
3596         nfs4_stateid stateid;
3597         unsigned long timestamp;
3598         struct nfs_fattr fattr;
3599         int rpc_status;
3600 };
3601
3602 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3603 {
3604         struct nfs4_delegreturndata *data = calldata;
3605
3606         nfs4_sequence_done(data->res.server, &data->res.seq_res,
3607                         task->tk_status);
3608
3609         switch (task->tk_status) {
3610         case -NFS4ERR_STALE_STATEID:
3611         case -NFS4ERR_EXPIRED:
3612         case 0:
3613                 renew_lease(data->res.server, data->timestamp);
3614                 break;
3615         default:
3616                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3617                                 -EAGAIN) {
3618                         nfs_restart_rpc(task, data->res.server->nfs_client);
3619                         return;
3620                 }
3621         }
3622         data->rpc_status = task->tk_status;
3623 }
3624
3625 static void nfs4_delegreturn_release(void *calldata)
3626 {
3627         kfree(calldata);
3628 }
3629
3630 #if defined(CONFIG_NFS_V4_1)
3631 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3632 {
3633         struct nfs4_delegreturndata *d_data;
3634
3635         d_data = (struct nfs4_delegreturndata *)data;
3636
3637         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3638                                 &d_data->args.seq_args,
3639                                 &d_data->res.seq_res, 1, task))
3640                 return;
3641         rpc_call_start(task);
3642 }
3643 #endif /* CONFIG_NFS_V4_1 */
3644
3645 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3646 #if defined(CONFIG_NFS_V4_1)
3647         .rpc_call_prepare = nfs4_delegreturn_prepare,
3648 #endif /* CONFIG_NFS_V4_1 */
3649         .rpc_call_done = nfs4_delegreturn_done,
3650         .rpc_release = nfs4_delegreturn_release,
3651 };
3652
3653 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3654 {
3655         struct nfs4_delegreturndata *data;
3656         struct nfs_server *server = NFS_SERVER(inode);
3657         struct rpc_task *task;
3658         struct rpc_message msg = {
3659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3660                 .rpc_cred = cred,
3661         };
3662         struct rpc_task_setup task_setup_data = {
3663                 .rpc_client = server->client,
3664                 .rpc_message = &msg,
3665                 .callback_ops = &nfs4_delegreturn_ops,
3666                 .flags = RPC_TASK_ASYNC,
3667         };
3668         int status = 0;
3669
3670         data = kzalloc(sizeof(*data), GFP_KERNEL);
3671         if (data == NULL)
3672                 return -ENOMEM;
3673         data->args.fhandle = &data->fh;
3674         data->args.stateid = &data->stateid;
3675         data->args.bitmask = server->attr_bitmask;
3676         nfs_copy_fh(&data->fh, NFS_FH(inode));
3677         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3678         data->res.fattr = &data->fattr;
3679         data->res.server = server;
3680         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3681         nfs_fattr_init(data->res.fattr);
3682         data->timestamp = jiffies;
3683         data->rpc_status = 0;
3684
3685         task_setup_data.callback_data = data;
3686         msg.rpc_argp = &data->args,
3687         msg.rpc_resp = &data->res,
3688         task = rpc_run_task(&task_setup_data);
3689         if (IS_ERR(task))
3690                 return PTR_ERR(task);
3691         if (!issync)
3692                 goto out;
3693         status = nfs4_wait_for_completion_rpc_task(task);
3694         if (status != 0)
3695                 goto out;
3696         status = data->rpc_status;
3697         if (status != 0)
3698                 goto out;
3699         nfs_refresh_inode(inode, &data->fattr);
3700 out:
3701         rpc_put_task(task);
3702         return status;
3703 }
3704
3705 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3706 {
3707         struct nfs_server *server = NFS_SERVER(inode);
3708         struct nfs4_exception exception = { };
3709         int err;
3710         do {
3711                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3712                 switch (err) {
3713                         case -NFS4ERR_STALE_STATEID:
3714                         case -NFS4ERR_EXPIRED:
3715                         case 0:
3716                                 return 0;
3717                 }
3718                 err = nfs4_handle_exception(server, err, &exception);
3719         } while (exception.retry);
3720         return err;
3721 }
3722
3723 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3724 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3725
3726 /*
3727  * sleep, with exponential backoff, and retry the LOCK operation.
3728  */
3729 static unsigned long
3730 nfs4_set_lock_task_retry(unsigned long timeout)
3731 {
3732         schedule_timeout_killable(timeout);
3733         timeout <<= 1;
3734         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3735                 return NFS4_LOCK_MAXTIMEOUT;
3736         return timeout;
3737 }
3738
3739 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3740 {
3741         struct inode *inode = state->inode;
3742         struct nfs_server *server = NFS_SERVER(inode);
3743         struct nfs_client *clp = server->nfs_client;
3744         struct nfs_lockt_args arg = {
3745                 .fh = NFS_FH(inode),
3746                 .fl = request,
3747         };
3748         struct nfs_lockt_res res = {
3749                 .denied = request,
3750         };
3751         struct rpc_message msg = {
3752                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3753                 .rpc_argp       = &arg,
3754                 .rpc_resp       = &res,
3755                 .rpc_cred       = state->owner->so_cred,
3756         };
3757         struct nfs4_lock_state *lsp;
3758         int status;
3759
3760         arg.lock_owner.clientid = clp->cl_clientid;
3761         status = nfs4_set_lock_state(state, request);
3762         if (status != 0)
3763                 goto out;
3764         lsp = request->fl_u.nfs4_fl.owner;
3765         arg.lock_owner.id = lsp->ls_id.id;
3766         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3767         switch (status) {
3768                 case 0:
3769                         request->fl_type = F_UNLCK;
3770                         break;
3771                 case -NFS4ERR_DENIED:
3772                         status = 0;
3773         }
3774         request->fl_ops->fl_release_private(request);
3775 out:
3776         return status;
3777 }
3778
3779 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3780 {
3781         struct nfs4_exception exception = { };
3782         int err;
3783
3784         do {
3785                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3786                                 _nfs4_proc_getlk(state, cmd, request),
3787                                 &exception);
3788         } while (exception.retry);
3789         return err;
3790 }
3791
3792 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3793 {
3794         int res = 0;
3795         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3796                 case FL_POSIX:
3797                         res = posix_lock_file_wait(file, fl);
3798                         break;
3799                 case FL_FLOCK:
3800                         res = flock_lock_file_wait(file, fl);
3801                         break;
3802                 default:
3803                         BUG();
3804         }
3805         return res;
3806 }
3807
3808 struct nfs4_unlockdata {
3809         struct nfs_locku_args arg;
3810         struct nfs_locku_res res;
3811         struct nfs4_lock_state *lsp;
3812         struct nfs_open_context *ctx;
3813         struct file_lock fl;
3814         const struct nfs_server *server;
3815         unsigned long timestamp;
3816 };
3817
3818 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3819                 struct nfs_open_context *ctx,
3820                 struct nfs4_lock_state *lsp,
3821                 struct nfs_seqid *seqid)
3822 {
3823         struct nfs4_unlockdata *p;
3824         struct inode *inode = lsp->ls_state->inode;
3825
3826         p = kzalloc(sizeof(*p), GFP_KERNEL);
3827         if (p == NULL)
3828                 return NULL;
3829         p->arg.fh = NFS_FH(inode);
3830         p->arg.fl = &p->fl;
3831         p->arg.seqid = seqid;
3832         p->res.seqid = seqid;
3833         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3834         p->arg.stateid = &lsp->ls_stateid;
3835         p->lsp = lsp;
3836         atomic_inc(&lsp->ls_count);
3837         /* Ensure we don't close file until we're done freeing locks! */
3838         p->ctx = get_nfs_open_context(ctx);
3839         memcpy(&p->fl, fl, sizeof(p->fl));
3840         p->server = NFS_SERVER(inode);
3841         return p;
3842 }
3843
3844 static void nfs4_locku_release_calldata(void *data)
3845 {
3846         struct nfs4_unlockdata *calldata = data;
3847         nfs_free_seqid(calldata->arg.seqid);
3848         nfs4_put_lock_state(calldata->lsp);
3849         put_nfs_open_context(calldata->ctx);
3850         kfree(calldata);
3851 }
3852
3853 static void nfs4_locku_done(struct rpc_task *task, void *data)
3854 {
3855         struct nfs4_unlockdata *calldata = data;
3856
3857         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3858                            task->tk_status);
3859         if (RPC_ASSASSINATED(task))
3860                 return;
3861         switch (task->tk_status) {
3862                 case 0:
3863                         memcpy(calldata->lsp->ls_stateid.data,
3864                                         calldata->res.stateid.data,
3865                                         sizeof(calldata->lsp->ls_stateid.data));
3866                         renew_lease(calldata->server, calldata->timestamp);
3867                         break;
3868                 case -NFS4ERR_BAD_STATEID:
3869                 case -NFS4ERR_OLD_STATEID:
3870                 case -NFS4ERR_STALE_STATEID:
3871                 case -NFS4ERR_EXPIRED:
3872                         break;
3873                 default:
3874                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3875                                 nfs_restart_rpc(task,
3876                                                  calldata->server->nfs_client);
3877         }
3878 }
3879
3880 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3881 {
3882         struct nfs4_unlockdata *calldata = data;
3883
3884         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3885                 return;
3886         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3887                 /* Note: exit _without_ running nfs4_locku_done */
3888                 task->tk_action = NULL;
3889                 return;
3890         }
3891         calldata->timestamp = jiffies;
3892         if (nfs4_setup_sequence(calldata->server->nfs_client,
3893                                 &calldata->arg.seq_args,
3894                                 &calldata->res.seq_res, 1, task))
3895                 return;
3896         rpc_call_start(task);
3897 }
3898
3899 static const struct rpc_call_ops nfs4_locku_ops = {
3900         .rpc_call_prepare = nfs4_locku_prepare,
3901         .rpc_call_done = nfs4_locku_done,
3902         .rpc_release = nfs4_locku_release_calldata,
3903 };
3904
3905 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3906                 struct nfs_open_context *ctx,
3907                 struct nfs4_lock_state *lsp,
3908                 struct nfs_seqid *seqid)
3909 {
3910         struct nfs4_unlockdata *data;
3911         struct rpc_message msg = {
3912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3913                 .rpc_cred = ctx->cred,
3914         };
3915         struct rpc_task_setup task_setup_data = {
3916                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3917                 .rpc_message = &msg,
3918                 .callback_ops = &nfs4_locku_ops,
3919                 .workqueue = nfsiod_workqueue,
3920                 .flags = RPC_TASK_ASYNC,
3921         };
3922
3923         /* Ensure this is an unlock - when canceling a lock, the
3924          * canceled lock is passed in, and it won't be an unlock.
3925          */
3926         fl->fl_type = F_UNLCK;
3927
3928         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3929         if (data == NULL) {
3930                 nfs_free_seqid(seqid);
3931                 return ERR_PTR(-ENOMEM);
3932         }
3933
3934         msg.rpc_argp = &data->arg,
3935         msg.rpc_resp = &data->res,
3936         task_setup_data.callback_data = data;
3937         return rpc_run_task(&task_setup_data);
3938 }
3939
3940 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3941 {
3942         struct nfs_inode *nfsi = NFS_I(state->inode);
3943         struct nfs_seqid *seqid;
3944         struct nfs4_lock_state *lsp;
3945         struct rpc_task *task;
3946         int status = 0;
3947         unsigned char fl_flags = request->fl_flags;
3948
3949         status = nfs4_set_lock_state(state, request);
3950         /* Unlock _before_ we do the RPC call */
3951         request->fl_flags |= FL_EXISTS;
3952         down_read(&nfsi->rwsem);
3953         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3954                 up_read(&nfsi->rwsem);
3955                 goto out;
3956         }
3957         up_read(&nfsi->rwsem);
3958         if (status != 0)
3959                 goto out;
3960         /* Is this a delegated lock? */
3961         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3962                 goto out;
3963         lsp = request->fl_u.nfs4_fl.owner;
3964         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3965         status = -ENOMEM;
3966         if (seqid == NULL)
3967                 goto out;
3968         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3969         status = PTR_ERR(task);
3970         if (IS_ERR(task))
3971                 goto out;
3972         status = nfs4_wait_for_completion_rpc_task(task);
3973         rpc_put_task(task);
3974 out:
3975         request->fl_flags = fl_flags;
3976         return status;
3977 }
3978
3979 struct nfs4_lockdata {
3980         struct nfs_lock_args arg;
3981         struct nfs_lock_res res;
3982         struct nfs4_lock_state *lsp;
3983         struct nfs_open_context *ctx;
3984         struct file_lock fl;
3985         unsigned long timestamp;
3986         int rpc_status;
3987         int cancelled;
3988         struct nfs_server *server;
3989 };
3990
3991 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3992                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3993 {
3994         struct nfs4_lockdata *p;
3995         struct inode *inode = lsp->ls_state->inode;
3996         struct nfs_server *server = NFS_SERVER(inode);
3997
3998         p = kzalloc(sizeof(*p), GFP_KERNEL);
3999         if (p == NULL)
4000                 return NULL;
4001
4002         p->arg.fh = NFS_FH(inode);
4003         p->arg.fl = &p->fl;
4004         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
4005         if (p->arg.open_seqid == NULL)
4006                 goto out_free;
4007         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
4008         if (p->arg.lock_seqid == NULL)
4009                 goto out_free_seqid;
4010         p->arg.lock_stateid = &lsp->ls_stateid;
4011         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4012         p->arg.lock_owner.id = lsp->ls_id.id;
4013         p->res.lock_seqid = p->arg.lock_seqid;
4014         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4015         p->lsp = lsp;
4016         p->server = server;
4017         atomic_inc(&lsp->ls_count);
4018         p->ctx = get_nfs_open_context(ctx);
4019         memcpy(&p->fl, fl, sizeof(p->fl));
4020         return p;
4021 out_free_seqid:
4022         nfs_free_seqid(p->arg.open_seqid);
4023 out_free:
4024         kfree(p);
4025         return NULL;
4026 }
4027
4028 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4029 {
4030         struct nfs4_lockdata *data = calldata;
4031         struct nfs4_state *state = data->lsp->ls_state;
4032
4033         dprintk("%s: begin!\n", __func__);
4034         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4035                 return;
4036         /* Do we need to do an open_to_lock_owner? */
4037         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4038                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4039                         return;
4040                 data->arg.open_stateid = &state->stateid;
4041                 data->arg.new_lock_owner = 1;
4042                 data->res.open_seqid = data->arg.open_seqid;
4043         } else
4044                 data->arg.new_lock_owner = 0;
4045         data->timestamp = jiffies;
4046         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
4047                                 &data->res.seq_res, 1, task))
4048                 return;
4049         rpc_call_start(task);
4050         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4051 }
4052
4053 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4054 {
4055         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4056         nfs4_lock_prepare(task, calldata);
4057 }
4058
4059 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4060 {
4061         struct nfs4_lockdata *data = calldata;
4062
4063         dprintk("%s: begin!\n", __func__);
4064
4065         nfs4_sequence_done(data->server, &data->res.seq_res,
4066                         task->tk_status);
4067
4068         data->rpc_status = task->tk_status;
4069         if (RPC_ASSASSINATED(task))
4070                 goto out;
4071         if (data->arg.new_lock_owner != 0) {
4072                 if (data->rpc_status == 0)
4073                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4074                 else
4075                         goto out;
4076         }
4077         if (data->rpc_status == 0) {
4078                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4079                                         sizeof(data->lsp->ls_stateid.data));
4080                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4081                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4082         }
4083 out:
4084         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4085 }
4086
4087 static void nfs4_lock_release(void *calldata)
4088 {
4089         struct nfs4_lockdata *data = calldata;
4090
4091         dprintk("%s: begin!\n", __func__);
4092         nfs_free_seqid(data->arg.open_seqid);
4093         if (data->cancelled != 0) {
4094                 struct rpc_task *task;
4095                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4096                                 data->arg.lock_seqid);
4097                 if (!IS_ERR(task))
4098                         rpc_put_task(task);
4099                 dprintk("%s: cancelling lock!\n", __func__);
4100         } else
4101                 nfs_free_seqid(data->arg.lock_seqid);
4102         nfs4_put_lock_state(data->lsp);
4103         put_nfs_open_context(data->ctx);
4104         kfree(data);
4105         dprintk("%s: done!\n", __func__);
4106 }
4107
4108 static const struct rpc_call_ops nfs4_lock_ops = {
4109         .rpc_call_prepare = nfs4_lock_prepare,
4110         .rpc_call_done = nfs4_lock_done,
4111         .rpc_release = nfs4_lock_release,
4112 };
4113
4114 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4115         .rpc_call_prepare = nfs4_recover_lock_prepare,
4116         .rpc_call_done = nfs4_lock_done,
4117         .rpc_release = nfs4_lock_release,
4118 };
4119
4120 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4121 {
4122         struct nfs_client *clp = server->nfs_client;
4123         struct nfs4_state *state = lsp->ls_state;
4124
4125         switch (error) {
4126         case -NFS4ERR_ADMIN_REVOKED:
4127         case -NFS4ERR_BAD_STATEID:
4128         case -NFS4ERR_EXPIRED:
4129                 if (new_lock_owner != 0 ||
4130                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4131                         nfs4_state_mark_reclaim_nograce(clp, state);
4132                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4133                 break;
4134         case -NFS4ERR_STALE_STATEID:
4135                 if (new_lock_owner != 0 ||
4136                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4137                         nfs4_state_mark_reclaim_reboot(clp, state);
4138                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4139         };
4140 }
4141
4142 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4143 {
4144         struct nfs4_lockdata *data;
4145         struct rpc_task *task;
4146         struct rpc_message msg = {
4147                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4148                 .rpc_cred = state->owner->so_cred,
4149         };
4150         struct rpc_task_setup task_setup_data = {
4151                 .rpc_client = NFS_CLIENT(state->inode),
4152                 .rpc_message = &msg,
4153                 .callback_ops = &nfs4_lock_ops,
4154                 .workqueue = nfsiod_workqueue,
4155                 .flags = RPC_TASK_ASYNC,
4156         };
4157         int ret;
4158
4159         dprintk("%s: begin!\n", __func__);
4160         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4161                         fl->fl_u.nfs4_fl.owner);
4162         if (data == NULL)
4163                 return -ENOMEM;
4164         if (IS_SETLKW(cmd))
4165                 data->arg.block = 1;
4166         if (recovery_type > NFS_LOCK_NEW) {
4167                 if (recovery_type == NFS_LOCK_RECLAIM)
4168                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4169                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4170         }
4171         msg.rpc_argp = &data->arg,
4172         msg.rpc_resp = &data->res,
4173         task_setup_data.callback_data = data;
4174         task = rpc_run_task(&task_setup_data);
4175         if (IS_ERR(task))
4176                 return PTR_ERR(task);
4177         ret = nfs4_wait_for_completion_rpc_task(task);
4178         if (ret == 0) {
4179                 ret = data->rpc_status;
4180                 if (ret)
4181                         nfs4_handle_setlk_error(data->server, data->lsp,
4182                                         data->arg.new_lock_owner, ret);
4183         } else
4184                 data->cancelled = 1;
4185         rpc_put_task(task);
4186         dprintk("%s: done, ret = %d!\n", __func__, ret);
4187         return ret;
4188 }
4189
4190 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4191 {
4192         struct nfs_server *server = NFS_SERVER(state->inode);
4193         struct nfs4_exception exception = { };
4194         int err;
4195
4196         do {
4197                 /* Cache the lock if possible... */
4198                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4199                         return 0;
4200                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4201                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4202                         break;
4203                 nfs4_handle_exception(server, err, &exception);
4204         } while (exception.retry);
4205         return err;
4206 }
4207
4208 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4209 {
4210         struct nfs_server *server = NFS_SERVER(state->inode);
4211         struct nfs4_exception exception = { };
4212         int err;
4213
4214         err = nfs4_set_lock_state(state, request);
4215         if (err != 0)
4216                 return err;
4217         do {
4218                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4219                         return 0;
4220                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4221                 switch (err) {
4222                 default:
4223                         goto out;
4224                 case -NFS4ERR_GRACE:
4225                 case -NFS4ERR_DELAY:
4226                 case -EKEYEXPIRED:
4227                         nfs4_handle_exception(server, err, &exception);
4228                         err = 0;
4229                 }
4230         } while (exception.retry);
4231 out:
4232         return err;
4233 }
4234
4235 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4236 {
4237         struct nfs_inode *nfsi = NFS_I(state->inode);
4238         unsigned char fl_flags = request->fl_flags;
4239         int status = -ENOLCK;
4240
4241         if ((fl_flags & FL_POSIX) &&
4242                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4243                 goto out;
4244         /* Is this a delegated open? */
4245         status = nfs4_set_lock_state(state, request);
4246         if (status != 0)
4247                 goto out;
4248         request->fl_flags |= FL_ACCESS;
4249         status = do_vfs_lock(request->fl_file, request);
4250         if (status < 0)
4251                 goto out;
4252         down_read(&nfsi->rwsem);
4253         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4254                 /* Yes: cache locks! */
4255                 /* ...but avoid races with delegation recall... */
4256                 request->fl_flags = fl_flags & ~FL_SLEEP;
4257                 status = do_vfs_lock(request->fl_file, request);
4258                 goto out_unlock;
4259         }
4260         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4261         if (status != 0)
4262                 goto out_unlock;
4263         /* Note: we always want to sleep here! */
4264         request->fl_flags = fl_flags | FL_SLEEP;
4265         if (do_vfs_lock(request->fl_file, request) < 0)
4266                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4267 out_unlock:
4268         up_read(&nfsi->rwsem);
4269 out:
4270         request->fl_flags = fl_flags;
4271         return status;
4272 }
4273
4274 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4275 {
4276         struct nfs4_exception exception = { };
4277         int err;
4278
4279         do {
4280                 err = _nfs4_proc_setlk(state, cmd, request);
4281                 if (err == -NFS4ERR_DENIED)
4282                         err = -EAGAIN;
4283                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4284                                 err, &exception);
4285         } while (exception.retry);
4286         return err;
4287 }
4288
4289 static int
4290 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4291 {
4292         struct nfs_open_context *ctx;
4293         struct nfs4_state *state;
4294         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4295         int status;
4296
4297         /* verify open state */
4298         ctx = nfs_file_open_context(filp);
4299         state = ctx->state;
4300
4301         if (request->fl_start < 0 || request->fl_end < 0)
4302                 return -EINVAL;
4303
4304         if (IS_GETLK(cmd)) {
4305                 if (state != NULL)
4306                         return nfs4_proc_getlk(state, F_GETLK, request);
4307                 return 0;
4308         }
4309
4310         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4311                 return -EINVAL;
4312
4313         if (request->fl_type == F_UNLCK) {
4314                 if (state != NULL)
4315                         return nfs4_proc_unlck(state, cmd, request);
4316                 return 0;
4317         }
4318
4319         if (state == NULL)
4320                 return -ENOLCK;
4321         do {
4322                 status = nfs4_proc_setlk(state, cmd, request);
4323                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4324                         break;
4325                 timeout = nfs4_set_lock_task_retry(timeout);
4326                 status = -ERESTARTSYS;
4327                 if (signalled())
4328                         break;
4329         } while(status < 0);
4330         return status;
4331 }
4332
4333 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4334 {
4335         struct nfs_server *server = NFS_SERVER(state->inode);
4336         struct nfs4_exception exception = { };
4337         int err;
4338
4339         err = nfs4_set_lock_state(state, fl);
4340         if (err != 0)
4341                 goto out;
4342         do {
4343                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4344                 switch (err) {
4345                         default:
4346                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4347                                                 __func__, err);
4348                         case 0:
4349                         case -ESTALE:
4350                                 goto out;
4351                         case -NFS4ERR_EXPIRED:
4352                         case -NFS4ERR_STALE_CLIENTID:
4353                         case -NFS4ERR_STALE_STATEID:
4354                         case -NFS4ERR_BADSESSION:
4355                         case -NFS4ERR_BADSLOT:
4356                         case -NFS4ERR_BAD_HIGH_SLOT:
4357                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4358                         case -NFS4ERR_DEADSESSION:
4359                                 nfs4_schedule_state_recovery(server->nfs_client);
4360                                 goto out;
4361                         case -ERESTARTSYS:
4362                                 /*
4363                                  * The show must go on: exit, but mark the
4364                                  * stateid as needing recovery.
4365                                  */
4366                         case -NFS4ERR_ADMIN_REVOKED:
4367                         case -NFS4ERR_BAD_STATEID:
4368                         case -NFS4ERR_OPENMODE:
4369                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4370                                 err = 0;
4371                                 goto out;
4372                         case -ENOMEM:
4373                         case -NFS4ERR_DENIED:
4374                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4375                                 err = 0;
4376                                 goto out;
4377                         case -NFS4ERR_DELAY:
4378                         case -EKEYEXPIRED:
4379                                 break;
4380                 }
4381                 err = nfs4_handle_exception(server, err, &exception);
4382         } while (exception.retry);
4383 out:
4384         return err;
4385 }
4386
4387 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4388
4389 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4390                 size_t buflen, int flags)
4391 {
4392         struct inode *inode = dentry->d_inode;
4393
4394         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4395                 return -EOPNOTSUPP;
4396
4397         return nfs4_proc_set_acl(inode, buf, buflen);
4398 }
4399
4400 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4401  * and that's what we'll do for e.g. user attributes that haven't been set.
4402  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4403  * attributes in kernel-managed attribute namespaces. */
4404 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4405                 size_t buflen)
4406 {
4407         struct inode *inode = dentry->d_inode;
4408
4409         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4410                 return -EOPNOTSUPP;
4411
4412         return nfs4_proc_get_acl(inode, buf, buflen);
4413 }
4414
4415 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4416 {
4417         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4418
4419         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4420                 return 0;
4421         if (buf && buflen < len)
4422                 return -ERANGE;
4423         if (buf)
4424                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4425         return len;
4426 }
4427
4428 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4429 {
4430         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4431                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4432                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4433                 return;
4434
4435         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4436                 NFS_ATTR_FATTR_NLINK;
4437         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4438         fattr->nlink = 2;
4439 }
4440
4441 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4442                 struct nfs4_fs_locations *fs_locations, struct page *page)
4443 {
4444         struct nfs_server *server = NFS_SERVER(dir);
4445         u32 bitmask[2] = {
4446                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4447                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4448         };
4449         struct nfs4_fs_locations_arg args = {
4450                 .dir_fh = NFS_FH(dir),
4451                 .name = name,
4452                 .page = page,
4453                 .bitmask = bitmask,
4454         };
4455         struct nfs4_fs_locations_res res = {
4456                 .fs_locations = fs_locations,
4457         };
4458         struct rpc_message msg = {
4459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4460                 .rpc_argp = &args,
4461                 .rpc_resp = &res,
4462         };
4463         int status;
4464
4465         dprintk("%s: start\n", __func__);
4466         nfs_fattr_init(&fs_locations->fattr);
4467         fs_locations->server = server;
4468         fs_locations->nlocations = 0;
4469         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4470         nfs_fixup_referral_attributes(&fs_locations->fattr);
4471         dprintk("%s: returned status = %d\n", __func__, status);
4472         return status;
4473 }
4474
4475 #ifdef CONFIG_NFS_V4_1
4476 /*
4477  * nfs4_proc_exchange_id()
4478  *
4479  * Since the clientid has expired, all compounds using sessions
4480  * associated with the stale clientid will be returning
4481  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4482  * be in some phase of session reset.
4483  */
4484 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4485 {
4486         nfs4_verifier verifier;
4487         struct nfs41_exchange_id_args args = {
4488                 .client = clp,
4489                 .flags = clp->cl_exchange_flags,
4490         };
4491         struct nfs41_exchange_id_res res = {
4492                 .client = clp,
4493         };
4494         int status;
4495         struct rpc_message msg = {
4496                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4497                 .rpc_argp = &args,
4498                 .rpc_resp = &res,
4499                 .rpc_cred = cred,
4500         };
4501         __be32 *p;
4502
4503         dprintk("--> %s\n", __func__);
4504         BUG_ON(clp == NULL);
4505
4506         /* Remove server-only flags */
4507         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4508
4509         p = (u32 *)verifier.data;
4510         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4511         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4512         args.verifier = &verifier;
4513
4514         while (1) {
4515                 args.id_len = scnprintf(args.id, sizeof(args.id),
4516                                         "%s/%s %u",
4517                                         clp->cl_ipaddr,
4518                                         rpc_peeraddr2str(clp->cl_rpcclient,
4519                                                          RPC_DISPLAY_ADDR),
4520                                         clp->cl_id_uniquifier);
4521
4522                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4523
4524                 if (status != -NFS4ERR_CLID_INUSE)
4525                         break;
4526
4527                 if (signalled())
4528                         break;
4529
4530                 if (++clp->cl_id_uniquifier == 0)
4531                         break;
4532         }
4533
4534         dprintk("<-- %s status= %d\n", __func__, status);
4535         return status;
4536 }
4537
4538 struct nfs4_get_lease_time_data {
4539         struct nfs4_get_lease_time_args *args;
4540         struct nfs4_get_lease_time_res *res;
4541         struct nfs_client *clp;
4542 };
4543
4544 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4545                                         void *calldata)
4546 {
4547         int ret;
4548         struct nfs4_get_lease_time_data *data =
4549                         (struct nfs4_get_lease_time_data *)calldata;
4550
4551         dprintk("--> %s\n", __func__);
4552         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4553         /* just setup sequence, do not trigger session recovery
4554            since we're invoked within one */
4555         ret = nfs41_setup_sequence(data->clp->cl_session,
4556                                    &data->args->la_seq_args,
4557                                    &data->res->lr_seq_res, 0, task);
4558
4559         BUG_ON(ret == -EAGAIN);
4560         rpc_call_start(task);
4561         dprintk("<-- %s\n", __func__);
4562 }
4563
4564 /*
4565  * Called from nfs4_state_manager thread for session setup, so don't recover
4566  * from sequence operation or clientid errors.
4567  */
4568 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4569 {
4570         struct nfs4_get_lease_time_data *data =
4571                         (struct nfs4_get_lease_time_data *)calldata;
4572
4573         dprintk("--> %s\n", __func__);
4574         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4575         switch (task->tk_status) {
4576         case -NFS4ERR_DELAY:
4577         case -NFS4ERR_GRACE:
4578         case -EKEYEXPIRED:
4579                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4580                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4581                 task->tk_status = 0;
4582                 nfs_restart_rpc(task, data->clp);
4583                 return;
4584         }
4585         dprintk("<-- %s\n", __func__);
4586 }
4587
4588 struct rpc_call_ops nfs4_get_lease_time_ops = {
4589         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4590         .rpc_call_done = nfs4_get_lease_time_done,
4591 };
4592
4593 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4594 {
4595         struct rpc_task *task;
4596         struct nfs4_get_lease_time_args args;
4597         struct nfs4_get_lease_time_res res = {
4598                 .lr_fsinfo = fsinfo,
4599         };
4600         struct nfs4_get_lease_time_data data = {
4601                 .args = &args,
4602                 .res = &res,
4603                 .clp = clp,
4604         };
4605         struct rpc_message msg = {
4606                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4607                 .rpc_argp = &args,
4608                 .rpc_resp = &res,
4609         };
4610         struct rpc_task_setup task_setup = {
4611                 .rpc_client = clp->cl_rpcclient,
4612                 .rpc_message = &msg,
4613                 .callback_ops = &nfs4_get_lease_time_ops,
4614                 .callback_data = &data
4615         };
4616         int status;
4617
4618         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4619         dprintk("--> %s\n", __func__);
4620         task = rpc_run_task(&task_setup);
4621
4622         if (IS_ERR(task))
4623                 status = PTR_ERR(task);
4624         else {
4625                 status = task->tk_status;
4626                 rpc_put_task(task);
4627         }
4628         dprintk("<-- %s return %d\n", __func__, status);
4629
4630         return status;
4631 }
4632
4633 /*
4634  * Reset a slot table
4635  */
4636 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4637                                  int ivalue)
4638 {
4639         struct nfs4_slot *new = NULL;
4640         int i;
4641         int ret = 0;
4642
4643         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4644                 max_reqs, tbl->max_slots);
4645
4646         /* Does the newly negotiated max_reqs match the existing slot table? */
4647         if (max_reqs != tbl->max_slots) {
4648                 ret = -ENOMEM;
4649                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4650                               GFP_KERNEL);
4651                 if (!new)
4652                         goto out;
4653                 ret = 0;
4654                 kfree(tbl->slots);
4655         }
4656         spin_lock(&tbl->slot_tbl_lock);
4657         if (new) {
4658                 tbl->slots = new;
4659                 tbl->max_slots = max_reqs;
4660         }
4661         for (i = 0; i < tbl->max_slots; ++i)
4662                 tbl->slots[i].seq_nr = ivalue;
4663         spin_unlock(&tbl->slot_tbl_lock);
4664         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4665                 tbl, tbl->slots, tbl->max_slots);
4666 out:
4667         dprintk("<-- %s: return %d\n", __func__, ret);
4668         return ret;
4669 }
4670
4671 /*
4672  * Reset the forechannel and backchannel slot tables
4673  */
4674 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4675 {
4676         int status;
4677
4678         status = nfs4_reset_slot_table(&session->fc_slot_table,
4679                         session->fc_attrs.max_reqs, 1);
4680         if (status)
4681                 return status;
4682
4683         status = nfs4_reset_slot_table(&session->bc_slot_table,
4684                         session->bc_attrs.max_reqs, 0);
4685         return status;
4686 }
4687
4688 /* Destroy the slot table */
4689 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4690 {
4691         if (session->fc_slot_table.slots != NULL) {
4692                 kfree(session->fc_slot_table.slots);
4693                 session->fc_slot_table.slots = NULL;
4694         }
4695         if (session->bc_slot_table.slots != NULL) {
4696                 kfree(session->bc_slot_table.slots);
4697                 session->bc_slot_table.slots = NULL;
4698         }
4699         return;
4700 }
4701
4702 /*
4703  * Initialize slot table
4704  */
4705 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4706                 int max_slots, int ivalue)
4707 {
4708         struct nfs4_slot *slot;
4709         int ret = -ENOMEM;
4710
4711         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4712
4713         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4714
4715         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4716         if (!slot)
4717                 goto out;
4718         ret = 0;
4719
4720         spin_lock(&tbl->slot_tbl_lock);
4721         tbl->max_slots = max_slots;
4722         tbl->slots = slot;
4723         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4724         spin_unlock(&tbl->slot_tbl_lock);
4725         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4726                 tbl, tbl->slots, tbl->max_slots);
4727 out:
4728         dprintk("<-- %s: return %d\n", __func__, ret);
4729         return ret;
4730 }
4731
4732 /*
4733  * Initialize the forechannel and backchannel tables
4734  */
4735 static int nfs4_init_slot_tables(struct nfs4_session *session)
4736 {
4737         struct nfs4_slot_table *tbl;
4738         int status = 0;
4739
4740         tbl = &session->fc_slot_table;
4741         if (tbl->slots == NULL) {
4742                 status = nfs4_init_slot_table(tbl,
4743                                 session->fc_attrs.max_reqs, 1);
4744                 if (status)
4745                         return status;
4746         }
4747
4748         tbl = &session->bc_slot_table;
4749         if (tbl->slots == NULL) {
4750                 status = nfs4_init_slot_table(tbl,
4751                                 session->bc_attrs.max_reqs, 0);
4752                 if (status)
4753                         nfs4_destroy_slot_tables(session);
4754         }
4755
4756         return status;
4757 }
4758
4759 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4760 {
4761         struct nfs4_session *session;
4762         struct nfs4_slot_table *tbl;
4763
4764         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4765         if (!session)
4766                 return NULL;
4767
4768         /*
4769          * The create session reply races with the server back
4770          * channel probe. Mark the client NFS_CS_SESSION_INITING
4771          * so that the client back channel can find the
4772          * nfs_client struct
4773          */
4774         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4775         init_completion(&session->complete);
4776
4777         tbl = &session->fc_slot_table;
4778         tbl->highest_used_slotid = -1;
4779         spin_lock_init(&tbl->slot_tbl_lock);
4780         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4781
4782         tbl = &session->bc_slot_table;
4783         tbl->highest_used_slotid = -1;
4784         spin_lock_init(&tbl->slot_tbl_lock);
4785         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4786
4787         session->clp = clp;
4788         return session;
4789 }
4790
4791 void nfs4_destroy_session(struct nfs4_session *session)
4792 {
4793         nfs4_proc_destroy_session(session);
4794         dprintk("%s Destroy backchannel for xprt %p\n",
4795                 __func__, session->clp->cl_rpcclient->cl_xprt);
4796         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4797                                 NFS41_BC_MIN_CALLBACKS);
4798         nfs4_destroy_slot_tables(session);
4799         kfree(session);
4800 }
4801
4802 /*
4803  * Initialize the values to be used by the client in CREATE_SESSION
4804  * If nfs4_init_session set the fore channel request and response sizes,
4805  * use them.
4806  *
4807  * Set the back channel max_resp_sz_cached to zero to force the client to
4808  * always set csa_cachethis to FALSE because the current implementation
4809  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4810  */
4811 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4812 {
4813         struct nfs4_session *session = args->client->cl_session;
4814         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4815                      mxresp_sz = session->fc_attrs.max_resp_sz;
4816
4817         if (mxrqst_sz == 0)
4818                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4819         if (mxresp_sz == 0)
4820                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4821         /* Fore channel attributes */
4822         args->fc_attrs.headerpadsz = 0;
4823         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4824         args->fc_attrs.max_resp_sz = mxresp_sz;
4825         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4826         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4827
4828         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4829                 "max_ops=%u max_reqs=%u\n",
4830                 __func__,
4831                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4832                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4833
4834         /* Back channel attributes */
4835         args->bc_attrs.headerpadsz = 0;
4836         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4837         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4838         args->bc_attrs.max_resp_sz_cached = 0;
4839         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4840         args->bc_attrs.max_reqs = 1;
4841
4842         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4843                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4844                 __func__,
4845                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4846                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4847                 args->bc_attrs.max_reqs);
4848 }
4849
4850 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4851 {
4852         if (rcvd <= sent)
4853                 return 0;
4854         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4855                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4856         return -EINVAL;
4857 }
4858
4859 #define _verify_fore_channel_attr(_name_) \
4860         _verify_channel_attr("fore", #_name_, \
4861                              args->fc_attrs._name_, \
4862                              session->fc_attrs._name_)
4863
4864 #define _verify_back_channel_attr(_name_) \
4865         _verify_channel_attr("back", #_name_, \
4866                              args->bc_attrs._name_, \
4867                              session->bc_attrs._name_)
4868
4869 /*
4870  * The server is not allowed to increase the fore channel header pad size,
4871  * maximum response size, or maximum number of operations.
4872  *
4873  * The back channel attributes are only negotiatied down: We send what the
4874  * (back channel) server insists upon.
4875  */
4876 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4877                                      struct nfs4_session *session)
4878 {
4879         int ret = 0;
4880
4881         ret |= _verify_fore_channel_attr(headerpadsz);
4882         ret |= _verify_fore_channel_attr(max_resp_sz);
4883         ret |= _verify_fore_channel_attr(max_ops);
4884
4885         ret |= _verify_back_channel_attr(headerpadsz);
4886         ret |= _verify_back_channel_attr(max_rqst_sz);
4887         ret |= _verify_back_channel_attr(max_resp_sz);
4888         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4889         ret |= _verify_back_channel_attr(max_ops);
4890         ret |= _verify_back_channel_attr(max_reqs);
4891
4892         return ret;
4893 }
4894
4895 static int _nfs4_proc_create_session(struct nfs_client *clp)
4896 {
4897         struct nfs4_session *session = clp->cl_session;
4898         struct nfs41_create_session_args args = {
4899                 .client = clp,
4900                 .cb_program = NFS4_CALLBACK,
4901         };
4902         struct nfs41_create_session_res res = {
4903                 .client = clp,
4904         };
4905         struct rpc_message msg = {
4906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4907                 .rpc_argp = &args,
4908                 .rpc_resp = &res,
4909         };
4910         int status;
4911
4912         nfs4_init_channel_attrs(&args);
4913         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4914
4915         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4916
4917         if (!status)
4918                 /* Verify the session's negotiated channel_attrs values */
4919                 status = nfs4_verify_channel_attrs(&args, session);
4920         if (!status) {
4921                 /* Increment the clientid slot sequence id */
4922                 clp->cl_seqid++;
4923         }
4924
4925         return status;
4926 }
4927
4928 /*
4929  * Issues a CREATE_SESSION operation to the server.
4930  * It is the responsibility of the caller to verify the session is
4931  * expired before calling this routine.
4932  */
4933 int nfs4_proc_create_session(struct nfs_client *clp)
4934 {
4935         int status;
4936         unsigned *ptr;
4937         struct nfs4_session *session = clp->cl_session;
4938
4939         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4940
4941         status = _nfs4_proc_create_session(clp);
4942         if (status)
4943                 goto out;
4944
4945         /* Init and reset the fore channel */
4946         status = nfs4_init_slot_tables(session);
4947         dprintk("slot table initialization returned %d\n", status);
4948         if (status)
4949                 goto out;
4950         status = nfs4_reset_slot_tables(session);
4951         dprintk("slot table reset returned %d\n", status);
4952         if (status)
4953                 goto out;
4954
4955         ptr = (unsigned *)&session->sess_id.data[0];
4956         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4957                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4958 out:
4959         dprintk("<-- %s\n", __func__);
4960         return status;
4961 }
4962
4963 /*
4964  * Issue the over-the-wire RPC DESTROY_SESSION.
4965  * The caller must serialize access to this routine.
4966  */
4967 int nfs4_proc_destroy_session(struct nfs4_session *session)
4968 {
4969         int status = 0;
4970         struct rpc_message msg;
4971
4972         dprintk("--> nfs4_proc_destroy_session\n");
4973
4974         /* session is still being setup */
4975         if (session->clp->cl_cons_state != NFS_CS_READY)
4976                 return status;
4977
4978         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4979         msg.rpc_argp = session;
4980         msg.rpc_resp = NULL;
4981         msg.rpc_cred = NULL;
4982         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4983
4984         if (status)
4985                 printk(KERN_WARNING
4986                         "Got error %d from the server on DESTROY_SESSION. "
4987                         "Session has been destroyed regardless...\n", status);
4988
4989         dprintk("<-- nfs4_proc_destroy_session\n");
4990         return status;
4991 }
4992
4993 int nfs4_init_session(struct nfs_server *server)
4994 {
4995         struct nfs_client *clp = server->nfs_client;
4996         struct nfs4_session *session;
4997         unsigned int rsize, wsize;
4998         int ret;
4999
5000         if (!nfs4_has_session(clp))
5001                 return 0;
5002
5003         rsize = server->rsize;
5004         if (rsize == 0)
5005                 rsize = NFS_MAX_FILE_IO_SIZE;
5006         wsize = server->wsize;
5007         if (wsize == 0)
5008                 wsize = NFS_MAX_FILE_IO_SIZE;
5009
5010         session = clp->cl_session;
5011         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5012         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5013
5014         ret = nfs4_recover_expired_lease(server);
5015         if (!ret)
5016                 ret = nfs4_check_client_ready(clp);
5017         return ret;
5018 }
5019
5020 /*
5021  * Renew the cl_session lease.
5022  */
5023 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5024 {
5025         struct nfs4_sequence_args args;
5026         struct nfs4_sequence_res res;
5027
5028         struct rpc_message msg = {
5029                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5030                 .rpc_argp = &args,
5031                 .rpc_resp = &res,
5032                 .rpc_cred = cred,
5033         };
5034
5035         args.sa_cache_this = 0;
5036
5037         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
5038                                        &res, args.sa_cache_this, 1);
5039 }
5040
5041 static void nfs41_sequence_release(void *data)
5042 {
5043         struct nfs_client *clp = (struct nfs_client *)data;
5044
5045         if (atomic_read(&clp->cl_count) > 1)
5046                 nfs4_schedule_state_renewal(clp);
5047         nfs_put_client(clp);
5048 }
5049
5050 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5051 {
5052         struct nfs_client *clp = (struct nfs_client *)data;
5053
5054         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
5055
5056         if (task->tk_status < 0) {
5057                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5058                 if (atomic_read(&clp->cl_count) == 1)
5059                         goto out;
5060
5061                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
5062                                                                 == -EAGAIN) {
5063                         nfs_restart_rpc(task, clp);
5064                         return;
5065                 }
5066         }
5067         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5068 out:
5069         kfree(task->tk_msg.rpc_argp);
5070         kfree(task->tk_msg.rpc_resp);
5071
5072         dprintk("<-- %s\n", __func__);
5073 }
5074
5075 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5076 {
5077         struct nfs_client *clp;
5078         struct nfs4_sequence_args *args;
5079         struct nfs4_sequence_res *res;
5080
5081         clp = (struct nfs_client *)data;
5082         args = task->tk_msg.rpc_argp;
5083         res = task->tk_msg.rpc_resp;
5084
5085         if (nfs4_setup_sequence(clp, args, res, 0, task))
5086                 return;
5087         rpc_call_start(task);
5088 }
5089
5090 static const struct rpc_call_ops nfs41_sequence_ops = {
5091         .rpc_call_done = nfs41_sequence_call_done,
5092         .rpc_call_prepare = nfs41_sequence_prepare,
5093         .rpc_release = nfs41_sequence_release,
5094 };
5095
5096 static int nfs41_proc_async_sequence(struct nfs_client *clp,
5097                                      struct rpc_cred *cred)
5098 {
5099         struct nfs4_sequence_args *args;
5100         struct nfs4_sequence_res *res;
5101         struct rpc_message msg = {
5102                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5103                 .rpc_cred = cred,
5104         };
5105
5106         if (!atomic_inc_not_zero(&clp->cl_count))
5107                 return -EIO;
5108         args = kzalloc(sizeof(*args), GFP_KERNEL);
5109         res = kzalloc(sizeof(*res), GFP_KERNEL);
5110         if (!args || !res) {
5111                 kfree(args);
5112                 kfree(res);
5113                 nfs_put_client(clp);
5114                 return -ENOMEM;
5115         }
5116         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
5117         msg.rpc_argp = args;
5118         msg.rpc_resp = res;
5119
5120         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
5121                               &nfs41_sequence_ops, (void *)clp);
5122 }
5123
5124 struct nfs4_reclaim_complete_data {
5125         struct nfs_client *clp;
5126         struct nfs41_reclaim_complete_args arg;
5127         struct nfs41_reclaim_complete_res res;
5128 };
5129
5130 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5131 {
5132         struct nfs4_reclaim_complete_data *calldata = data;
5133
5134         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5135         if (nfs4_setup_sequence(calldata->clp, &calldata->arg.seq_args,
5136                                 &calldata->res.seq_res, 0, task))
5137                 return;
5138
5139         rpc_call_start(task);
5140 }
5141
5142 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5143 {
5144         struct nfs4_reclaim_complete_data *calldata = data;
5145         struct nfs_client *clp = calldata->clp;
5146         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5147
5148         dprintk("--> %s\n", __func__);
5149         nfs41_sequence_done(clp, res, task->tk_status);
5150         switch (task->tk_status) {
5151         case 0:
5152         case -NFS4ERR_COMPLETE_ALREADY:
5153                 break;
5154         case -NFS4ERR_BADSESSION:
5155         case -NFS4ERR_DEADSESSION:
5156                 /*
5157                  * Handle the session error, but do not retry the operation, as
5158                  * we have no way of telling whether the clientid had to be
5159                  * reset before we got our reply.  If reset, a new wave of
5160                  * reclaim operations will follow, containing their own reclaim
5161                  * complete.  We don't want our retry to get on the way of
5162                  * recovery by incorrectly indicating to the server that we're
5163                  * done reclaiming state since the process had to be restarted.
5164                  */
5165                 _nfs4_async_handle_error(task, NULL, clp, NULL);
5166                 break;
5167         default:
5168                 if (_nfs4_async_handle_error(
5169                                 task, NULL, clp, NULL) == -EAGAIN) {
5170                         rpc_restart_call_prepare(task);
5171                         return;
5172                 }
5173         }
5174
5175         dprintk("<-- %s\n", __func__);
5176 }
5177
5178 static void nfs4_free_reclaim_complete_data(void *data)
5179 {
5180         struct nfs4_reclaim_complete_data *calldata = data;
5181
5182         kfree(calldata);
5183 }
5184
5185 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5186         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5187         .rpc_call_done = nfs4_reclaim_complete_done,
5188         .rpc_release = nfs4_free_reclaim_complete_data,
5189 };
5190
5191 /*
5192  * Issue a global reclaim complete.
5193  */
5194 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5195 {
5196         struct nfs4_reclaim_complete_data *calldata;
5197         struct rpc_task *task;
5198         struct rpc_message msg = {
5199                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5200         };
5201         struct rpc_task_setup task_setup_data = {
5202                 .rpc_client = clp->cl_rpcclient,
5203                 .rpc_message = &msg,
5204                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5205                 .flags = RPC_TASK_ASYNC,
5206         };
5207         int status = -ENOMEM;
5208
5209         dprintk("--> %s\n", __func__);
5210         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
5211         if (calldata == NULL)
5212                 goto out;
5213         calldata->clp = clp;
5214         calldata->arg.one_fs = 0;
5215         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5216
5217         msg.rpc_argp = &calldata->arg;
5218         msg.rpc_resp = &calldata->res;
5219         task_setup_data.callback_data = calldata;
5220         task = rpc_run_task(&task_setup_data);
5221         if (IS_ERR(task)) {
5222                 status = PTR_ERR(task);
5223                 goto out;
5224         }
5225         rpc_put_task(task);
5226         return 0;
5227 out:
5228         dprintk("<-- %s status=%d\n", __func__, status);
5229         return status;
5230 }
5231 #endif /* CONFIG_NFS_V4_1 */
5232
5233 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5234         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5235         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5236         .recover_open   = nfs4_open_reclaim,
5237         .recover_lock   = nfs4_lock_reclaim,
5238         .establish_clid = nfs4_init_clientid,
5239         .get_clid_cred  = nfs4_get_setclientid_cred,
5240 };
5241
5242 #if defined(CONFIG_NFS_V4_1)
5243 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5244         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5245         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5246         .recover_open   = nfs4_open_reclaim,
5247         .recover_lock   = nfs4_lock_reclaim,
5248         .establish_clid = nfs41_init_clientid,
5249         .get_clid_cred  = nfs4_get_exchange_id_cred,
5250         .reclaim_complete = nfs41_proc_reclaim_complete,
5251 };
5252 #endif /* CONFIG_NFS_V4_1 */
5253
5254 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5255         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5256         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5257         .recover_open   = nfs4_open_expired,
5258         .recover_lock   = nfs4_lock_expired,
5259         .establish_clid = nfs4_init_clientid,
5260         .get_clid_cred  = nfs4_get_setclientid_cred,
5261 };
5262
5263 #if defined(CONFIG_NFS_V4_1)
5264 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5265         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5266         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5267         .recover_open   = nfs4_open_expired,
5268         .recover_lock   = nfs4_lock_expired,
5269         .establish_clid = nfs41_init_clientid,
5270         .get_clid_cred  = nfs4_get_exchange_id_cred,
5271 };
5272 #endif /* CONFIG_NFS_V4_1 */
5273
5274 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5275         .sched_state_renewal = nfs4_proc_async_renew,
5276         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5277         .renew_lease = nfs4_proc_renew,
5278 };
5279
5280 #if defined(CONFIG_NFS_V4_1)
5281 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5282         .sched_state_renewal = nfs41_proc_async_sequence,
5283         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5284         .renew_lease = nfs4_proc_sequence,
5285 };
5286 #endif
5287
5288 /*
5289  * Per minor version reboot and network partition recovery ops
5290  */
5291
5292 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5293         &nfs40_reboot_recovery_ops,
5294 #if defined(CONFIG_NFS_V4_1)
5295         &nfs41_reboot_recovery_ops,
5296 #endif
5297 };
5298
5299 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5300         &nfs40_nograce_recovery_ops,
5301 #if defined(CONFIG_NFS_V4_1)
5302         &nfs41_nograce_recovery_ops,
5303 #endif
5304 };
5305
5306 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5307         &nfs40_state_renewal_ops,
5308 #if defined(CONFIG_NFS_V4_1)
5309         &nfs41_state_renewal_ops,
5310 #endif
5311 };
5312
5313 static const struct inode_operations nfs4_file_inode_operations = {
5314         .permission     = nfs_permission,
5315         .getattr        = nfs_getattr,
5316         .setattr        = nfs_setattr,
5317         .getxattr       = nfs4_getxattr,
5318         .setxattr       = nfs4_setxattr,
5319         .listxattr      = nfs4_listxattr,
5320 };
5321
5322 const struct nfs_rpc_ops nfs_v4_clientops = {
5323         .version        = 4,                    /* protocol version */
5324         .dentry_ops     = &nfs4_dentry_operations,
5325         .dir_inode_ops  = &nfs4_dir_inode_operations,
5326         .file_inode_ops = &nfs4_file_inode_operations,
5327         .getroot        = nfs4_proc_get_root,
5328         .getattr        = nfs4_proc_getattr,
5329         .setattr        = nfs4_proc_setattr,
5330         .lookupfh       = nfs4_proc_lookupfh,
5331         .lookup         = nfs4_proc_lookup,
5332         .access         = nfs4_proc_access,
5333         .readlink       = nfs4_proc_readlink,
5334         .create         = nfs4_proc_create,
5335         .remove         = nfs4_proc_remove,
5336         .unlink_setup   = nfs4_proc_unlink_setup,
5337         .unlink_done    = nfs4_proc_unlink_done,
5338         .rename         = nfs4_proc_rename,
5339         .link           = nfs4_proc_link,
5340         .symlink        = nfs4_proc_symlink,
5341         .mkdir          = nfs4_proc_mkdir,
5342         .rmdir          = nfs4_proc_remove,
5343         .readdir        = nfs4_proc_readdir,
5344         .mknod          = nfs4_proc_mknod,
5345         .statfs         = nfs4_proc_statfs,
5346         .fsinfo         = nfs4_proc_fsinfo,
5347         .pathconf       = nfs4_proc_pathconf,
5348         .set_capabilities = nfs4_server_capabilities,
5349         .decode_dirent  = nfs4_decode_dirent,
5350         .read_setup     = nfs4_proc_read_setup,
5351         .read_done      = nfs4_read_done,
5352         .write_setup    = nfs4_proc_write_setup,
5353         .write_done     = nfs4_write_done,
5354         .commit_setup   = nfs4_proc_commit_setup,
5355         .commit_done    = nfs4_commit_done,
5356         .lock           = nfs4_proc_lock,
5357         .clear_acl_cache = nfs4_zap_acl_attr,
5358         .close_context  = nfs4_close_context,
5359 };
5360
5361 /*
5362  * Local variables:
5363  *  c-basic-offset: 8
5364  * End:
5365  */