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/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.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/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51 #include <linux/module.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 struct nfs4_opendata;
  65 static int _nfs4_proc_open(struct nfs4_opendata *data);
  66 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  67 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  68 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70
  71 /* Prevent leaks of NFSv4 errors into userland */
  72 static int nfs4_map_errors(int err)
  73 {
  74         if (err < -1000) {
  75                 dprintk("%s could not handle NFSv4 error %d\n",
  76                                 __func__, -err);
  77                 return -EIO;
  78         }
  79         return err;
  80 }
  81
  82 /*
  83  * This is our standard bitmap for GETATTR requests.
  84  */
  85 const u32 nfs4_fattr_bitmap[2] = {
  86         FATTR4_WORD0_TYPE
  87         | FATTR4_WORD0_CHANGE
  88         | FATTR4_WORD0_SIZE
  89         | FATTR4_WORD0_FSID
  90         | FATTR4_WORD0_FILEID,
  91         FATTR4_WORD1_MODE
  92         | FATTR4_WORD1_NUMLINKS
  93         | FATTR4_WORD1_OWNER
  94         | FATTR4_WORD1_OWNER_GROUP
  95         | FATTR4_WORD1_RAWDEV
  96         | FATTR4_WORD1_SPACE_USED
  97         | FATTR4_WORD1_TIME_ACCESS
  98         | FATTR4_WORD1_TIME_METADATA
  99         | FATTR4_WORD1_TIME_MODIFY
 100 };
 101
 102 const u32 nfs4_statfs_bitmap[2] = {
 103         FATTR4_WORD0_FILES_AVAIL
 104         | FATTR4_WORD0_FILES_FREE
 105         | FATTR4_WORD0_FILES_TOTAL,
 106         FATTR4_WORD1_SPACE_AVAIL
 107         | FATTR4_WORD1_SPACE_FREE
 108         | FATTR4_WORD1_SPACE_TOTAL
 109 };
 110
 111 const u32 nfs4_pathconf_bitmap[2] = {
 112         FATTR4_WORD0_MAXLINK
 113         | FATTR4_WORD0_MAXNAME,
 114         0
 115 };
 116
 117 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 118                         | FATTR4_WORD0_MAXREAD
 119                         | FATTR4_WORD0_MAXWRITE
 120                         | FATTR4_WORD0_LEASE_TIME,
 121                         0
 122 };
 123
 124 const u32 nfs4_fs_locations_bitmap[2] = {
 125         FATTR4_WORD0_TYPE
 126         | FATTR4_WORD0_CHANGE
 127         | FATTR4_WORD0_SIZE
 128         | FATTR4_WORD0_FSID
 129         | FATTR4_WORD0_FILEID
 130         | FATTR4_WORD0_FS_LOCATIONS,
 131         FATTR4_WORD1_MODE
 132         | FATTR4_WORD1_NUMLINKS
 133         | FATTR4_WORD1_OWNER
 134         | FATTR4_WORD1_OWNER_GROUP
 135         | FATTR4_WORD1_RAWDEV
 136         | FATTR4_WORD1_SPACE_USED
 137         | FATTR4_WORD1_TIME_ACCESS
 138         | FATTR4_WORD1_TIME_METADATA
 139         | FATTR4_WORD1_TIME_MODIFY
 140         | FATTR4_WORD1_MOUNTED_ON_FILEID
 141 };
 142
 143 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 144                 struct nfs4_readdir_arg *readdir)
 145 {
 146         __be32 *start, *p;
 147
 148         BUG_ON(readdir->count < 80);
 149         if (cookie > 2) {
 150                 readdir->cookie = cookie;
 151                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 152                 return;
 153         }
 154
 155         readdir->cookie = 0;
 156         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 157         if (cookie == 2)
 158                 return;
 159
 160         /*
 161          * NFSv4 servers do not return entries for '.' and '..'
 162          * Therefore, we fake these entries here.  We let '.'
 163          * have cookie 0 and '..' have cookie 1.  Note that
 164          * when talking to the server, we always send cookie 0
 165          * instead of 1 or 2.
 166          */
 167         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 168
 169         if (cookie == 0) {
 170                 *p++ = xdr_one;                                  /* next */
 171                 *p++ = xdr_zero;                   /* cookie, first word */
 172                 *p++ = xdr_one;                   /* cookie, second word */
 173                 *p++ = xdr_one;                             /* entry len */
 174                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 175                 p++;
 176                 *p++ = xdr_one;                         /* bitmap length */
 177                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 178                 *p++ = htonl(8);              /* attribute buffer length */
 179                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 180         }
 181
 182         *p++ = xdr_one;                                  /* next */
 183         *p++ = xdr_zero;                   /* cookie, first word */
 184         *p++ = xdr_two;                   /* cookie, second word */
 185         *p++ = xdr_two;                             /* entry len */
 186         memcpy(p, "..\0\0", 4);                         /* entry */
 187         p++;
 188         *p++ = xdr_one;                         /* bitmap length */
 189         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 190         *p++ = htonl(8);              /* attribute buffer length */
 191         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 192
 193         readdir->pgbase = (char *)p - (char *)start;
 194         readdir->count -= readdir->pgbase;
 195         kunmap_atomic(start, KM_USER0);
 196 }
 197
 198 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 199 {
 200         int res;
 201
 202         might_sleep();
 203
 204         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 205                         nfs_wait_bit_killable, TASK_KILLABLE);
 206         return res;
 207 }
 208
 209 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 210 {
 211         int res = 0;
 212
 213         might_sleep();
 214
 215         if (*timeout <= 0)
 216                 *timeout = NFS4_POLL_RETRY_MIN;
 217         if (*timeout > NFS4_POLL_RETRY_MAX)
 218                 *timeout = NFS4_POLL_RETRY_MAX;
 219         schedule_timeout_killable(*timeout);
 220         if (fatal_signal_pending(current))
 221                 res = -ERESTARTSYS;
 222         *timeout <<= 1;
 223         return res;
 224 }
 225
 226 /* This is the error handling routine for processes that are allowed
 227  * to sleep.
 228  */
 229 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 230 {
 231         struct nfs_client *clp = server->nfs_client;
 232         struct nfs4_state *state = exception->state;
 233         int ret = errorcode;
 234
 235         exception->retry = 0;
 236         switch(errorcode) {
 237                 case 0:
 238                         return 0;
 239                 case -NFS4ERR_ADMIN_REVOKED:
 240                 case -NFS4ERR_BAD_STATEID:
 241                 case -NFS4ERR_OPENMODE:
 242                         if (state == NULL)
 243                                 break;
 244                         nfs4_state_mark_reclaim_nograce(clp, state);
 245                 case -NFS4ERR_STALE_CLIENTID:
 246                 case -NFS4ERR_STALE_STATEID:
 247                 case -NFS4ERR_EXPIRED:
 248                         nfs4_schedule_state_recovery(clp);
 249                         ret = nfs4_wait_clnt_recover(clp);
 250                         if (ret == 0)
 251                                 exception->retry = 1;
 252 #if !defined(CONFIG_NFS_V4_1)
 253                         break;
 254 #else /* !defined(CONFIG_NFS_V4_1) */
 255                         if (!nfs4_has_session(server->nfs_client))
 256                                 break;
 257                         /* FALLTHROUGH */
 258                 case -NFS4ERR_BADSESSION:
 259                 case -NFS4ERR_BADSLOT:
 260                 case -NFS4ERR_BAD_HIGH_SLOT:
 261                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 262                 case -NFS4ERR_DEADSESSION:
 263                 case -NFS4ERR_SEQ_FALSE_RETRY:
 264                 case -NFS4ERR_SEQ_MISORDERED:
 265                         dprintk("%s ERROR: %d Reset session\n", __func__,
 266                                 errorcode);
 267                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
 268                         exception->retry = 1;
 269                         /* FALLTHROUGH */
 270 #endif /* !defined(CONFIG_NFS_V4_1) */
 271                 case -NFS4ERR_FILE_OPEN:
 272                 case -NFS4ERR_GRACE:
 273                 case -NFS4ERR_DELAY:
 274                         ret = nfs4_delay(server->client, &exception->timeout);
 275                         if (ret != 0)
 276                                 break;
 277                 case -NFS4ERR_OLD_STATEID:
 278                         exception->retry = 1;
 279         }
 280         /* We failed to handle the error */
 281         return nfs4_map_errors(ret);
 282 }
 283
 284
 285 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 286 {
 287         struct nfs_client *clp = server->nfs_client;
 288         spin_lock(&clp->cl_lock);
 289         if (time_before(clp->cl_last_renewal,timestamp))
 290                 clp->cl_last_renewal = timestamp;
 291         spin_unlock(&clp->cl_lock);
 292 }
 293
 294 #if defined(CONFIG_NFS_V4_1)
 295
 296 /*
 297  * nfs4_free_slot - free a slot and efficiently update slot table.
 298  *
 299  * freeing a slot is trivially done by clearing its respective bit
 300  * in the bitmap.
 301  * If the freed slotid equals highest_used_slotid we want to update it
 302  * so that the server would be able to size down the slot table if needed,
 303  * otherwise we know that the highest_used_slotid is still in use.
 304  * When updating highest_used_slotid there may be "holes" in the bitmap
 305  * so we need to scan down from highest_used_slotid to 0 looking for the now
 306  * highest slotid in use.
 307  * If none found, highest_used_slotid is set to -1.
 308  */
 309 static void
 310 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 311 {
 312         int slotid = free_slotid;
 313
 314         spin_lock(&tbl->slot_tbl_lock);
 315         /* clear used bit in bitmap */
 316         __clear_bit(slotid, tbl->used_slots);
 317
 318         /* update highest_used_slotid when it is freed */
 319         if (slotid == tbl->highest_used_slotid) {
 320                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 321                 if (slotid >= 0 && slotid < tbl->max_slots)
 322                         tbl->highest_used_slotid = slotid;
 323                 else
 324                         tbl->highest_used_slotid = -1;
 325         }
 326         rpc_wake_up_next(&tbl->slot_tbl_waitq);
 327         spin_unlock(&tbl->slot_tbl_lock);
 328         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 329                 free_slotid, tbl->highest_used_slotid);
 330 }
 331
 332 void nfs41_sequence_free_slot(const struct nfs_client *clp,
 333                               struct nfs4_sequence_res *res)
 334 {
 335         struct nfs4_slot_table *tbl;
 336
 337         if (!nfs4_has_session(clp)) {
 338                 dprintk("%s: No session\n", __func__);
 339                 return;
 340         }
 341         tbl = &clp->cl_session->fc_slot_table;
 342         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 343                 dprintk("%s: No slot\n", __func__);
 344                 /* just wake up the next guy waiting since
 345                  * we may have not consumed a slot after all */
 346                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 347                 return;
 348         }
 349         nfs4_free_slot(tbl, res->sr_slotid);
 350         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 351 }
 352
 353 static void nfs41_sequence_done(struct nfs_client *clp,
 354                                 struct nfs4_sequence_res *res,
 355                                 int rpc_status)
 356 {
 357         unsigned long timestamp;
 358         struct nfs4_slot_table *tbl;
 359         struct nfs4_slot *slot;
 360
 361         /*
 362          * sr_status remains 1 if an RPC level error occurred. The server
 363          * may or may not have processed the sequence operation..
 364          * Proceed as if the server received and processed the sequence
 365          * operation.
 366          */
 367         if (res->sr_status == 1)
 368                 res->sr_status = NFS_OK;
 369
 370         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 371         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 372                 goto out;
 373
 374         tbl = &clp->cl_session->fc_slot_table;
 375         slot = tbl->slots + res->sr_slotid;
 376
 377         if (res->sr_status == 0) {
 378                 /* Update the slot's sequence and clientid lease timer */
 379                 ++slot->seq_nr;
 380                 timestamp = res->sr_renewal_time;
 381                 spin_lock(&clp->cl_lock);
 382                 if (time_before(clp->cl_last_renewal, timestamp))
 383                         clp->cl_last_renewal = timestamp;
 384                 spin_unlock(&clp->cl_lock);
 385                 return;
 386         }
 387 out:
 388         /* The session may be reset by one of the error handlers. */
 389         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 390         nfs41_sequence_free_slot(clp, res);
 391 }
 392
 393 /*
 394  * nfs4_find_slot - efficiently look for a free slot
 395  *
 396  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 397  * If found, we mark the slot as used, update the highest_used_slotid,
 398  * and respectively set up the sequence operation args.
 399  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 400  *
 401  * Note: must be called with under the slot_tbl_lock.
 402  */
 403 static u8
 404 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
 405 {
 406         int slotid;
 407         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 408         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 409
 410         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 411                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 412                 tbl->max_slots);
 413         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 414         if (slotid >= tbl->max_slots)
 415                 goto out;
 416         __set_bit(slotid, tbl->used_slots);
 417         if (slotid > tbl->highest_used_slotid)
 418                 tbl->highest_used_slotid = slotid;
 419         ret_id = slotid;
 420 out:
 421         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 422                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 423         return ret_id;
 424 }
 425
 426 static int nfs4_recover_session(struct nfs4_session *session)
 427 {
 428         struct nfs_client *clp = session->clp;
 429         int ret;
 430
 431         for (;;) {
 432                 ret = nfs4_wait_clnt_recover(clp);
 433                 if (ret != 0)
 434                                 return ret;
 435                 if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
 436                         break;
 437                 nfs4_schedule_state_manager(clp);
 438         }
 439         return 0;
 440 }
 441
 442 static int nfs41_setup_sequence(struct nfs4_session *session,
 443                                 struct nfs4_sequence_args *args,
 444                                 struct nfs4_sequence_res *res,
 445                                 int cache_reply,
 446                                 struct rpc_task *task)
 447 {
 448         struct nfs4_slot *slot;
 449         struct nfs4_slot_table *tbl;
 450         int status = 0;
 451         u8 slotid;
 452
 453         dprintk("--> %s\n", __func__);
 454         /* slot already allocated? */
 455         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 456                 return 0;
 457
 458         memset(res, 0, sizeof(*res));
 459         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 460         tbl = &session->fc_slot_table;
 461
 462         spin_lock(&tbl->slot_tbl_lock);
 463         if (test_bit(NFS4CLNT_SESSION_SETUP, &session->clp->cl_state)) {
 464                 if (tbl->highest_used_slotid != -1) {
 465                         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 466                         spin_unlock(&tbl->slot_tbl_lock);
 467                         dprintk("<-- %s: Session reset: draining\n", __func__);
 468                         return -EAGAIN;
 469                 }
 470
 471                 /* The slot table is empty; start the reset thread */
 472                 dprintk("%s Session Reset\n", __func__);
 473                 spin_unlock(&tbl->slot_tbl_lock);
 474                 status = nfs4_recover_session(session);
 475                 if (status)
 476                         return status;
 477                 spin_lock(&tbl->slot_tbl_lock);
 478         }
 479
 480         slotid = nfs4_find_slot(tbl, task);
 481         if (slotid == NFS4_MAX_SLOT_TABLE) {
 482                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 483                 spin_unlock(&tbl->slot_tbl_lock);
 484                 dprintk("<-- %s: no free slots\n", __func__);
 485                 return -EAGAIN;
 486         }
 487         spin_unlock(&tbl->slot_tbl_lock);
 488
 489         slot = tbl->slots + slotid;
 490         args->sa_session = session;
 491         args->sa_slotid = slotid;
 492         args->sa_cache_this = cache_reply;
 493
 494         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 495
 496         res->sr_session = session;
 497         res->sr_slotid = slotid;
 498         res->sr_renewal_time = jiffies;
 499         /*
 500          * sr_status is only set in decode_sequence, and so will remain
 501          * set to 1 if an rpc level failure occurs.
 502          */
 503         res->sr_status = 1;
 504         return 0;
 505 }
 506
 507 int nfs4_setup_sequence(struct nfs_client *clp,
 508                         struct nfs4_sequence_args *args,
 509                         struct nfs4_sequence_res *res,
 510                         int cache_reply,
 511                         struct rpc_task *task)
 512 {
 513         int ret = 0;
 514
 515         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 516                 __func__, clp, clp->cl_session, res->sr_slotid);
 517
 518         if (!nfs4_has_session(clp))
 519                 goto out;
 520         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
 521                                    task);
 522         if (ret != -EAGAIN) {
 523                 /* terminate rpc task */
 524                 task->tk_status = ret;
 525                 task->tk_action = NULL;
 526         }
 527 out:
 528         dprintk("<-- %s status=%d\n", __func__, ret);
 529         return ret;
 530 }
 531
 532 struct nfs41_call_sync_data {
 533         struct nfs_client *clp;
 534         struct nfs4_sequence_args *seq_args;
 535         struct nfs4_sequence_res *seq_res;
 536         int cache_reply;
 537 };
 538
 539 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 540 {
 541         struct nfs41_call_sync_data *data = calldata;
 542
 543         dprintk("--> %s data->clp->cl_session %p\n", __func__,
 544                 data->clp->cl_session);
 545         if (nfs4_setup_sequence(data->clp, data->seq_args,
 546                                 data->seq_res, data->cache_reply, task))
 547                 return;
 548         rpc_call_start(task);
 549 }
 550
 551 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 552 {
 553         struct nfs41_call_sync_data *data = calldata;
 554
 555         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
 556         nfs41_sequence_free_slot(data->clp, data->seq_res);
 557 }
 558
 559 struct rpc_call_ops nfs41_call_sync_ops = {
 560         .rpc_call_prepare = nfs41_call_sync_prepare,
 561         .rpc_call_done = nfs41_call_sync_done,
 562 };
 563
 564 static int nfs4_call_sync_sequence(struct nfs_client *clp,
 565                                    struct rpc_clnt *clnt,
 566                                    struct rpc_message *msg,
 567                                    struct nfs4_sequence_args *args,
 568                                    struct nfs4_sequence_res *res,
 569                                    int cache_reply)
 570 {
 571         int ret;
 572         struct rpc_task *task;
 573         struct nfs41_call_sync_data data = {
 574                 .clp = clp,
 575                 .seq_args = args,
 576                 .seq_res = res,
 577                 .cache_reply = cache_reply,
 578         };
 579         struct rpc_task_setup task_setup = {
 580                 .rpc_client = clnt,
 581                 .rpc_message = msg,
 582                 .callback_ops = &nfs41_call_sync_ops,
 583                 .callback_data = &data
 584         };
 585
 586         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 587         task = rpc_run_task(&task_setup);
 588         if (IS_ERR(task))
 589                 ret = PTR_ERR(task);
 590         else {
 591                 ret = task->tk_status;
 592                 rpc_put_task(task);
 593         }
 594         return ret;
 595 }
 596
 597 int _nfs4_call_sync_session(struct nfs_server *server,
 598                             struct rpc_message *msg,
 599                             struct nfs4_sequence_args *args,
 600                             struct nfs4_sequence_res *res,
 601                             int cache_reply)
 602 {
 603         return nfs4_call_sync_sequence(server->nfs_client, server->client,
 604                                        msg, args, res, cache_reply);
 605 }
 606
 607 #endif /* CONFIG_NFS_V4_1 */
 608
 609 int _nfs4_call_sync(struct nfs_server *server,
 610                     struct rpc_message *msg,
 611                     struct nfs4_sequence_args *args,
 612                     struct nfs4_sequence_res *res,
 613                     int cache_reply)
 614 {
 615         args->sa_session = res->sr_session = NULL;
 616         return rpc_call_sync(server->client, msg, 0);
 617 }
 618
 619 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 620         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 621                         &(res)->seq_res, (cache_reply))
 622
 623 static void nfs4_sequence_done(const struct nfs_server *server,
 624                                struct nfs4_sequence_res *res, int rpc_status)
 625 {
 626 #ifdef CONFIG_NFS_V4_1
 627         if (nfs4_has_session(server->nfs_client))
 628                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
 629 #endif /* CONFIG_NFS_V4_1 */
 630 }
 631
 632 /* no restart, therefore free slot here */
 633 static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
 634                                          struct nfs4_sequence_res *res,
 635                                          int rpc_status)
 636 {
 637         nfs4_sequence_done(server, res, rpc_status);
 638         nfs4_sequence_free_slot(server->nfs_client, res);
 639 }
 640
 641 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 642 {
 643         struct nfs_inode *nfsi = NFS_I(dir);
 644
 645         spin_lock(&dir->i_lock);
 646         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 647         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 648                 nfs_force_lookup_revalidate(dir);
 649         nfsi->change_attr = cinfo->after;
 650         spin_unlock(&dir->i_lock);
 651 }
 652
 653 struct nfs4_opendata {
 654         struct kref kref;
 655         struct nfs_openargs o_arg;
 656         struct nfs_openres o_res;
 657         struct nfs_open_confirmargs c_arg;
 658         struct nfs_open_confirmres c_res;
 659         struct nfs_fattr f_attr;
 660         struct nfs_fattr dir_attr;
 661         struct path path;
 662         struct dentry *dir;
 663         struct nfs4_state_owner *owner;
 664         struct nfs4_state *state;
 665         struct iattr attrs;
 666         unsigned long timestamp;
 667         unsigned int rpc_done : 1;
 668         int rpc_status;
 669         int cancelled;
 670 };
 671
 672
 673 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 674 {
 675         p->o_res.f_attr = &p->f_attr;
 676         p->o_res.dir_attr = &p->dir_attr;
 677         p->o_res.seqid = p->o_arg.seqid;
 678         p->c_res.seqid = p->c_arg.seqid;
 679         p->o_res.server = p->o_arg.server;
 680         nfs_fattr_init(&p->f_attr);
 681         nfs_fattr_init(&p->dir_attr);
 682 }
 683
 684 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 685                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 686                 const struct iattr *attrs)
 687 {
 688         struct dentry *parent = dget_parent(path->dentry);
 689         struct inode *dir = parent->d_inode;
 690         struct nfs_server *server = NFS_SERVER(dir);
 691         struct nfs4_opendata *p;
 692
 693         p = kzalloc(sizeof(*p), GFP_KERNEL);
 694         if (p == NULL)
 695                 goto err;
 696         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 697         if (p->o_arg.seqid == NULL)
 698                 goto err_free;
 699         p->path.mnt = mntget(path->mnt);
 700         p->path.dentry = dget(path->dentry);
 701         p->dir = parent;
 702         p->owner = sp;
 703         atomic_inc(&sp->so_count);
 704         p->o_arg.fh = NFS_FH(dir);
 705         p->o_arg.open_flags = flags;
 706         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 707         p->o_arg.clientid = server->nfs_client->cl_clientid;
 708         p->o_arg.id = sp->so_owner_id.id;
 709         p->o_arg.name = &p->path.dentry->d_name;
 710         p->o_arg.server = server;
 711         p->o_arg.bitmask = server->attr_bitmask;
 712         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 713         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 714         if (flags & O_EXCL) {
 715                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 716                 s[0] = jiffies;
 717                 s[1] = current->pid;
 718         } else if (flags & O_CREAT) {
 719                 p->o_arg.u.attrs = &p->attrs;
 720                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 721         }
 722         p->c_arg.fh = &p->o_res.fh;
 723         p->c_arg.stateid = &p->o_res.stateid;
 724         p->c_arg.seqid = p->o_arg.seqid;
 725         nfs4_init_opendata_res(p);
 726         kref_init(&p->kref);
 727         return p;
 728 err_free:
 729         kfree(p);
 730 err:
 731         dput(parent);
 732         return NULL;
 733 }
 734
 735 static void nfs4_opendata_free(struct kref *kref)
 736 {
 737         struct nfs4_opendata *p = container_of(kref,
 738                         struct nfs4_opendata, kref);
 739
 740         nfs_free_seqid(p->o_arg.seqid);
 741         if (p->state != NULL)
 742                 nfs4_put_open_state(p->state);
 743         nfs4_put_state_owner(p->owner);
 744         dput(p->dir);
 745         path_put(&p->path);
 746         kfree(p);
 747 }
 748
 749 static void nfs4_opendata_put(struct nfs4_opendata *p)
 750 {
 751         if (p != NULL)
 752                 kref_put(&p->kref, nfs4_opendata_free);
 753 }
 754
 755 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 756 {
 757         int ret;
 758
 759         ret = rpc_wait_for_completion_task(task);
 760         return ret;
 761 }
 762
 763 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 764 {
 765         int ret = 0;
 766
 767         if (open_mode & O_EXCL)
 768                 goto out;
 769         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 770                 case FMODE_READ:
 771                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 772                         break;
 773                 case FMODE_WRITE:
 774                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 775                         break;
 776                 case FMODE_READ|FMODE_WRITE:
 777                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 778         }
 779 out:
 780         return ret;
 781 }
 782
 783 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 784 {
 785         if ((delegation->type & fmode) != fmode)
 786                 return 0;
 787         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 788                 return 0;
 789         nfs_mark_delegation_referenced(delegation);
 790         return 1;
 791 }
 792
 793 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 794 {
 795         switch (fmode) {
 796                 case FMODE_WRITE:
 797                         state->n_wronly++;
 798                         break;
 799                 case FMODE_READ:
 800                         state->n_rdonly++;
 801                         break;
 802                 case FMODE_READ|FMODE_WRITE:
 803                         state->n_rdwr++;
 804         }
 805         nfs4_state_set_mode_locked(state, state->state | fmode);
 806 }
 807
 808 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 809 {
 810         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 811                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 812         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 813         switch (fmode) {
 814                 case FMODE_READ:
 815                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 816                         break;
 817                 case FMODE_WRITE:
 818                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 819                         break;
 820                 case FMODE_READ|FMODE_WRITE:
 821                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 822         }
 823 }
 824
 825 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 826 {
 827         write_seqlock(&state->seqlock);
 828         nfs_set_open_stateid_locked(state, stateid, fmode);
 829         write_sequnlock(&state->seqlock);
 830 }
 831
 832 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 833 {
 834         /*
 835          * Protect the call to nfs4_state_set_mode_locked and
 836          * serialise the stateid update
 837          */
 838         write_seqlock(&state->seqlock);
 839         if (deleg_stateid != NULL) {
 840                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 841                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 842         }
 843         if (open_stateid != NULL)
 844                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 845         write_sequnlock(&state->seqlock);
 846         spin_lock(&state->owner->so_lock);
 847         update_open_stateflags(state, fmode);
 848         spin_unlock(&state->owner->so_lock);
 849 }
 850
 851 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 852 {
 853         struct nfs_inode *nfsi = NFS_I(state->inode);
 854         struct nfs_delegation *deleg_cur;
 855         int ret = 0;
 856
 857         fmode &= (FMODE_READ|FMODE_WRITE);
 858
 859         rcu_read_lock();
 860         deleg_cur = rcu_dereference(nfsi->delegation);
 861         if (deleg_cur == NULL)
 862                 goto no_delegation;
 863
 864         spin_lock(&deleg_cur->lock);
 865         if (nfsi->delegation != deleg_cur ||
 866             (deleg_cur->type & fmode) != fmode)
 867                 goto no_delegation_unlock;
 868
 869         if (delegation == NULL)
 870                 delegation = &deleg_cur->stateid;
 871         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 872                 goto no_delegation_unlock;
 873
 874         nfs_mark_delegation_referenced(deleg_cur);
 875         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 876         ret = 1;
 877 no_delegation_unlock:
 878         spin_unlock(&deleg_cur->lock);
 879 no_delegation:
 880         rcu_read_unlock();
 881
 882         if (!ret && open_stateid != NULL) {
 883                 __update_open_stateid(state, open_stateid, NULL, fmode);
 884                 ret = 1;
 885         }
 886
 887         return ret;
 888 }
 889
 890
 891 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 892 {
 893         struct nfs_delegation *delegation;
 894
 895         rcu_read_lock();
 896         delegation = rcu_dereference(NFS_I(inode)->delegation);
 897         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 898                 rcu_read_unlock();
 899                 return;
 900         }
 901         rcu_read_unlock();
 902         nfs_inode_return_delegation(inode);
 903 }
 904
 905 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 906 {
 907         struct nfs4_state *state = opendata->state;
 908         struct nfs_inode *nfsi = NFS_I(state->inode);
 909         struct nfs_delegation *delegation;
 910         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 911         fmode_t fmode = opendata->o_arg.fmode;
 912         nfs4_stateid stateid;
 913         int ret = -EAGAIN;
 914
 915         for (;;) {
 916                 if (can_open_cached(state, fmode, open_mode)) {
 917                         spin_lock(&state->owner->so_lock);
 918                         if (can_open_cached(state, fmode, open_mode)) {
 919                                 update_open_stateflags(state, fmode);
 920                                 spin_unlock(&state->owner->so_lock);
 921                                 goto out_return_state;
 922                         }
 923                         spin_unlock(&state->owner->so_lock);
 924                 }
 925                 rcu_read_lock();
 926                 delegation = rcu_dereference(nfsi->delegation);
 927                 if (delegation == NULL ||
 928                     !can_open_delegated(delegation, fmode)) {
 929                         rcu_read_unlock();
 930                         break;
 931                 }
 932                 /* Save the delegation */
 933                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 934                 rcu_read_unlock();
 935                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 936                 if (ret != 0)
 937                         goto out;
 938                 ret = -EAGAIN;
 939
 940                 /* Try to update the stateid using the delegation */
 941                 if (update_open_stateid(state, NULL, &stateid, fmode))
 942                         goto out_return_state;
 943         }
 944 out:
 945         return ERR_PTR(ret);
 946 out_return_state:
 947         atomic_inc(&state->count);
 948         return state;
 949 }
 950
 951 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 952 {
 953         struct inode *inode;
 954         struct nfs4_state *state = NULL;
 955         struct nfs_delegation *delegation;
 956         int ret;
 957
 958         if (!data->rpc_done) {
 959                 state = nfs4_try_open_cached(data);
 960                 goto out;
 961         }
 962
 963         ret = -EAGAIN;
 964         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 965                 goto err;
 966         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 967         ret = PTR_ERR(inode);
 968         if (IS_ERR(inode))
 969                 goto err;
 970         ret = -ENOMEM;
 971         state = nfs4_get_open_state(inode, data->owner);
 972         if (state == NULL)
 973                 goto err_put_inode;
 974         if (data->o_res.delegation_type != 0) {
 975                 int delegation_flags = 0;
 976
 977                 rcu_read_lock();
 978                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 979                 if (delegation)
 980                         delegation_flags = delegation->flags;
 981                 rcu_read_unlock();
 982                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 983                         nfs_inode_set_delegation(state->inode,
 984                                         data->owner->so_cred,
 985                                         &data->o_res);
 986                 else
 987                         nfs_inode_reclaim_delegation(state->inode,
 988                                         data->owner->so_cred,
 989                                         &data->o_res);
 990         }
 991
 992         update_open_stateid(state, &data->o_res.stateid, NULL,
 993                         data->o_arg.fmode);
 994         iput(inode);
 995 out:
 996         return state;
 997 err_put_inode:
 998         iput(inode);
 999 err:
1000         return ERR_PTR(ret);
1001 }
1002
1003 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1004 {
1005         struct nfs_inode *nfsi = NFS_I(state->inode);
1006         struct nfs_open_context *ctx;
1007
1008         spin_lock(&state->inode->i_lock);
1009         list_for_each_entry(ctx, &nfsi->open_files, list) {
1010                 if (ctx->state != state)
1011                         continue;
1012                 get_nfs_open_context(ctx);
1013                 spin_unlock(&state->inode->i_lock);
1014                 return ctx;
1015         }
1016         spin_unlock(&state->inode->i_lock);
1017         return ERR_PTR(-ENOENT);
1018 }
1019
1020 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1021 {
1022         struct nfs4_opendata *opendata;
1023
1024         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1025         if (opendata == NULL)
1026                 return ERR_PTR(-ENOMEM);
1027         opendata->state = state;
1028         atomic_inc(&state->count);
1029         return opendata;
1030 }
1031
1032 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1033 {
1034         struct nfs4_state *newstate;
1035         int ret;
1036
1037         opendata->o_arg.open_flags = 0;
1038         opendata->o_arg.fmode = fmode;
1039         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1040         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1041         nfs4_init_opendata_res(opendata);
1042         ret = _nfs4_proc_open(opendata);
1043         if (ret != 0)
1044                 return ret;
1045         newstate = nfs4_opendata_to_nfs4_state(opendata);
1046         if (IS_ERR(newstate))
1047                 return PTR_ERR(newstate);
1048         nfs4_close_state(&opendata->path, newstate, fmode);
1049         *res = newstate;
1050         return 0;
1051 }
1052
1053 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1054 {
1055         struct nfs4_state *newstate;
1056         int ret;
1057
1058         /* memory barrier prior to reading state->n_* */
1059         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1060         smp_rmb();
1061         if (state->n_rdwr != 0) {
1062                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1063                 if (ret != 0)
1064                         return ret;
1065                 if (newstate != state)
1066                         return -ESTALE;
1067         }
1068         if (state->n_wronly != 0) {
1069                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1070                 if (ret != 0)
1071                         return ret;
1072                 if (newstate != state)
1073                         return -ESTALE;
1074         }
1075         if (state->n_rdonly != 0) {
1076                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1077                 if (ret != 0)
1078                         return ret;
1079                 if (newstate != state)
1080                         return -ESTALE;
1081         }
1082         /*
1083          * We may have performed cached opens for all three recoveries.
1084          * Check if we need to update the current stateid.
1085          */
1086         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1087             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1088                 write_seqlock(&state->seqlock);
1089                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1090                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1091                 write_sequnlock(&state->seqlock);
1092         }
1093         return 0;
1094 }
1095
1096 /*
1097  * OPEN_RECLAIM:
1098  *      reclaim state on the server after a reboot.
1099  */
1100 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1101 {
1102         struct nfs_delegation *delegation;
1103         struct nfs4_opendata *opendata;
1104         fmode_t delegation_type = 0;
1105         int status;
1106
1107         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1108         if (IS_ERR(opendata))
1109                 return PTR_ERR(opendata);
1110         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1111         opendata->o_arg.fh = NFS_FH(state->inode);
1112         rcu_read_lock();
1113         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1114         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1115                 delegation_type = delegation->type;
1116         rcu_read_unlock();
1117         opendata->o_arg.u.delegation_type = delegation_type;
1118         status = nfs4_open_recover(opendata, state);
1119         nfs4_opendata_put(opendata);
1120         return status;
1121 }
1122
1123 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1124 {
1125         struct nfs_server *server = NFS_SERVER(state->inode);
1126         struct nfs4_exception exception = { };
1127         int err;
1128         do {
1129                 err = _nfs4_do_open_reclaim(ctx, state);
1130                 if (err != -NFS4ERR_DELAY)
1131                         break;
1132                 nfs4_handle_exception(server, err, &exception);
1133         } while (exception.retry);
1134         return err;
1135 }
1136
1137 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1138 {
1139         struct nfs_open_context *ctx;
1140         int ret;
1141
1142         ctx = nfs4_state_find_open_context(state);
1143         if (IS_ERR(ctx))
1144                 return PTR_ERR(ctx);
1145         ret = nfs4_do_open_reclaim(ctx, state);
1146         put_nfs_open_context(ctx);
1147         return ret;
1148 }
1149
1150 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1151 {
1152         struct nfs4_opendata *opendata;
1153         int ret;
1154
1155         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1156         if (IS_ERR(opendata))
1157                 return PTR_ERR(opendata);
1158         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1159         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1160                         sizeof(opendata->o_arg.u.delegation.data));
1161         ret = nfs4_open_recover(opendata, state);
1162         nfs4_opendata_put(opendata);
1163         return ret;
1164 }
1165
1166 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1167 {
1168         struct nfs4_exception exception = { };
1169         struct nfs_server *server = NFS_SERVER(state->inode);
1170         int err;
1171         do {
1172                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1173                 switch (err) {
1174                         case 0:
1175                                 return err;
1176                         case -NFS4ERR_STALE_CLIENTID:
1177                         case -NFS4ERR_STALE_STATEID:
1178                         case -NFS4ERR_EXPIRED:
1179                                 /* Don't recall a delegation if it was lost */
1180                                 nfs4_schedule_state_recovery(server->nfs_client);
1181                                 return err;
1182                 }
1183                 err = nfs4_handle_exception(server, err, &exception);
1184         } while (exception.retry);
1185         return err;
1186 }
1187
1188 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1189 {
1190         struct nfs4_opendata *data = calldata;
1191
1192         data->rpc_status = task->tk_status;
1193         if (RPC_ASSASSINATED(task))
1194                 return;
1195         if (data->rpc_status == 0) {
1196                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1197                                 sizeof(data->o_res.stateid.data));
1198                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1199                 renew_lease(data->o_res.server, data->timestamp);
1200                 data->rpc_done = 1;
1201         }
1202 }
1203
1204 static void nfs4_open_confirm_release(void *calldata)
1205 {
1206         struct nfs4_opendata *data = calldata;
1207         struct nfs4_state *state = NULL;
1208
1209         /* If this request hasn't been cancelled, do nothing */
1210         if (data->cancelled == 0)
1211                 goto out_free;
1212         /* In case of error, no cleanup! */
1213         if (!data->rpc_done)
1214                 goto out_free;
1215         state = nfs4_opendata_to_nfs4_state(data);
1216         if (!IS_ERR(state))
1217                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1218 out_free:
1219         nfs4_opendata_put(data);
1220 }
1221
1222 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1223         .rpc_call_done = nfs4_open_confirm_done,
1224         .rpc_release = nfs4_open_confirm_release,
1225 };
1226
1227 /*
1228  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1229  */
1230 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1231 {
1232         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1233         struct rpc_task *task;
1234         struct  rpc_message msg = {
1235                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1236                 .rpc_argp = &data->c_arg,
1237                 .rpc_resp = &data->c_res,
1238                 .rpc_cred = data->owner->so_cred,
1239         };
1240         struct rpc_task_setup task_setup_data = {
1241                 .rpc_client = server->client,
1242                 .rpc_message = &msg,
1243                 .callback_ops = &nfs4_open_confirm_ops,
1244                 .callback_data = data,
1245                 .workqueue = nfsiod_workqueue,
1246                 .flags = RPC_TASK_ASYNC,
1247         };
1248         int status;
1249
1250         kref_get(&data->kref);
1251         data->rpc_done = 0;
1252         data->rpc_status = 0;
1253         data->timestamp = jiffies;
1254         task = rpc_run_task(&task_setup_data);
1255         if (IS_ERR(task))
1256                 return PTR_ERR(task);
1257         status = nfs4_wait_for_completion_rpc_task(task);
1258         if (status != 0) {
1259                 data->cancelled = 1;
1260                 smp_wmb();
1261         } else
1262                 status = data->rpc_status;
1263         rpc_put_task(task);
1264         return status;
1265 }
1266
1267 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1268 {
1269         struct nfs4_opendata *data = calldata;
1270         struct nfs4_state_owner *sp = data->owner;
1271
1272         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1273                 return;
1274         /*
1275          * Check if we still need to send an OPEN call, or if we can use
1276          * a delegation instead.
1277          */
1278         if (data->state != NULL) {
1279                 struct nfs_delegation *delegation;
1280
1281                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1282                         goto out_no_action;
1283                 rcu_read_lock();
1284                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1285                 if (delegation != NULL &&
1286                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1287                         rcu_read_unlock();
1288                         goto out_no_action;
1289                 }
1290                 rcu_read_unlock();
1291         }
1292         /* Update sequence id. */
1293         data->o_arg.id = sp->so_owner_id.id;
1294         data->o_arg.clientid = sp->so_client->cl_clientid;
1295         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1296                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1297                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1298         }
1299         data->timestamp = jiffies;
1300         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1301                                 &data->o_arg.seq_args,
1302                                 &data->o_res.seq_res, 1, task))
1303                 return;
1304         rpc_call_start(task);
1305         return;
1306 out_no_action:
1307         task->tk_action = NULL;
1308
1309 }
1310
1311 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1312 {
1313         struct nfs4_opendata *data = calldata;
1314
1315         data->rpc_status = task->tk_status;
1316
1317         nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
1318                                      task->tk_status);
1319
1320         if (RPC_ASSASSINATED(task))
1321                 return;
1322         if (task->tk_status == 0) {
1323                 switch (data->o_res.f_attr->mode & S_IFMT) {
1324                         case S_IFREG:
1325                                 break;
1326                         case S_IFLNK:
1327                                 data->rpc_status = -ELOOP;
1328                                 break;
1329                         case S_IFDIR:
1330                                 data->rpc_status = -EISDIR;
1331                                 break;
1332                         default:
1333                                 data->rpc_status = -ENOTDIR;
1334                 }
1335                 renew_lease(data->o_res.server, data->timestamp);
1336                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1337                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1338         }
1339         data->rpc_done = 1;
1340 }
1341
1342 static void nfs4_open_release(void *calldata)
1343 {
1344         struct nfs4_opendata *data = calldata;
1345         struct nfs4_state *state = NULL;
1346
1347         /* If this request hasn't been cancelled, do nothing */
1348         if (data->cancelled == 0)
1349                 goto out_free;
1350         /* In case of error, no cleanup! */
1351         if (data->rpc_status != 0 || !data->rpc_done)
1352                 goto out_free;
1353         /* In case we need an open_confirm, no cleanup! */
1354         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1355                 goto out_free;
1356         state = nfs4_opendata_to_nfs4_state(data);
1357         if (!IS_ERR(state))
1358                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1359 out_free:
1360         nfs4_opendata_put(data);
1361 }
1362
1363 static const struct rpc_call_ops nfs4_open_ops = {
1364         .rpc_call_prepare = nfs4_open_prepare,
1365         .rpc_call_done = nfs4_open_done,
1366         .rpc_release = nfs4_open_release,
1367 };
1368
1369 /*
1370  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1371  */
1372 static int _nfs4_proc_open(struct nfs4_opendata *data)
1373 {
1374         struct inode *dir = data->dir->d_inode;
1375         struct nfs_server *server = NFS_SERVER(dir);
1376         struct nfs_openargs *o_arg = &data->o_arg;
1377         struct nfs_openres *o_res = &data->o_res;
1378         struct rpc_task *task;
1379         struct rpc_message msg = {
1380                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1381                 .rpc_argp = o_arg,
1382                 .rpc_resp = o_res,
1383                 .rpc_cred = data->owner->so_cred,
1384         };
1385         struct rpc_task_setup task_setup_data = {
1386                 .rpc_client = server->client,
1387                 .rpc_message = &msg,
1388                 .callback_ops = &nfs4_open_ops,
1389                 .callback_data = data,
1390                 .workqueue = nfsiod_workqueue,
1391                 .flags = RPC_TASK_ASYNC,
1392         };
1393         int status;
1394
1395         kref_get(&data->kref);
1396         data->rpc_done = 0;
1397         data->rpc_status = 0;
1398         data->cancelled = 0;
1399         task = rpc_run_task(&task_setup_data);
1400         if (IS_ERR(task))
1401                 return PTR_ERR(task);
1402         status = nfs4_wait_for_completion_rpc_task(task);
1403         if (status != 0) {
1404                 data->cancelled = 1;
1405                 smp_wmb();
1406         } else
1407                 status = data->rpc_status;
1408         rpc_put_task(task);
1409         if (status != 0 || !data->rpc_done)
1410                 return status;
1411
1412         if (o_res->fh.size == 0)
1413                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1414
1415         if (o_arg->open_flags & O_CREAT) {
1416                 update_changeattr(dir, &o_res->cinfo);
1417                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1418         } else
1419                 nfs_refresh_inode(dir, o_res->dir_attr);
1420         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1421                 status = _nfs4_proc_open_confirm(data);
1422                 if (status != 0)
1423                         return status;
1424         }
1425         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1426                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1427         return 0;
1428 }
1429
1430 static int nfs4_recover_expired_lease(struct nfs_server *server)
1431 {
1432         struct nfs_client *clp = server->nfs_client;
1433         int ret;
1434
1435         for (;;) {
1436                 ret = nfs4_wait_clnt_recover(clp);
1437                 if (ret != 0)
1438                         return ret;
1439                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1440                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1441                         break;
1442                 nfs4_schedule_state_recovery(clp);
1443         }
1444         return 0;
1445 }
1446
1447 /*
1448  * OPEN_EXPIRED:
1449  *      reclaim state on the server after a network partition.
1450  *      Assumes caller holds the appropriate lock
1451  */
1452 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1453 {
1454         struct nfs4_opendata *opendata;
1455         int ret;
1456
1457         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1458         if (IS_ERR(opendata))
1459                 return PTR_ERR(opendata);
1460         ret = nfs4_open_recover(opendata, state);
1461         if (ret == -ESTALE)
1462                 d_drop(ctx->path.dentry);
1463         nfs4_opendata_put(opendata);
1464         return ret;
1465 }
1466
1467 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1468 {
1469         struct nfs_server *server = NFS_SERVER(state->inode);
1470         struct nfs4_exception exception = { };
1471         int err;
1472
1473         do {
1474                 err = _nfs4_open_expired(ctx, state);
1475                 if (err != -NFS4ERR_DELAY)
1476                         break;
1477                 nfs4_handle_exception(server, err, &exception);
1478         } while (exception.retry);
1479         return err;
1480 }
1481
1482 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1483 {
1484         struct nfs_open_context *ctx;
1485         int ret;
1486
1487         ctx = nfs4_state_find_open_context(state);
1488         if (IS_ERR(ctx))
1489                 return PTR_ERR(ctx);
1490         ret = nfs4_do_open_expired(ctx, state);
1491         put_nfs_open_context(ctx);
1492         return ret;
1493 }
1494
1495 /*
1496  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1497  * fields corresponding to attributes that were used to store the verifier.
1498  * Make sure we clobber those fields in the later setattr call
1499  */
1500 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1501 {
1502         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1503             !(sattr->ia_valid & ATTR_ATIME_SET))
1504                 sattr->ia_valid |= ATTR_ATIME;
1505
1506         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1507             !(sattr->ia_valid & ATTR_MTIME_SET))
1508                 sattr->ia_valid |= ATTR_MTIME;
1509 }
1510
1511 /*
1512  * Returns a referenced nfs4_state
1513  */
1514 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)
1515 {
1516         struct nfs4_state_owner  *sp;
1517         struct nfs4_state     *state = NULL;
1518         struct nfs_server       *server = NFS_SERVER(dir);
1519         struct nfs4_opendata *opendata;
1520         int status;
1521
1522         /* Protect against reboot recovery conflicts */
1523         status = -ENOMEM;
1524         if (!(sp = nfs4_get_state_owner(server, cred))) {
1525                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1526                 goto out_err;
1527         }
1528         status = nfs4_recover_expired_lease(server);
1529         if (status != 0)
1530                 goto err_put_state_owner;
1531         if (path->dentry->d_inode != NULL)
1532                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1533         status = -ENOMEM;
1534         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1535         if (opendata == NULL)
1536                 goto err_put_state_owner;
1537
1538         if (path->dentry->d_inode != NULL)
1539                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1540
1541         status = _nfs4_proc_open(opendata);
1542         if (status != 0)
1543                 goto err_opendata_put;
1544
1545         if (opendata->o_arg.open_flags & O_EXCL)
1546                 nfs4_exclusive_attrset(opendata, sattr);
1547
1548         state = nfs4_opendata_to_nfs4_state(opendata);
1549         status = PTR_ERR(state);
1550         if (IS_ERR(state))
1551                 goto err_opendata_put;
1552         nfs4_opendata_put(opendata);
1553         nfs4_put_state_owner(sp);
1554         *res = state;
1555         return 0;
1556 err_opendata_put:
1557         nfs4_opendata_put(opendata);
1558 err_put_state_owner:
1559         nfs4_put_state_owner(sp);
1560 out_err:
1561         *res = NULL;
1562         return status;
1563 }
1564
1565
1566 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)
1567 {
1568         struct nfs4_exception exception = { };
1569         struct nfs4_state *res;
1570         int status;
1571
1572         do {
1573                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1574                 if (status == 0)
1575                         break;
1576                 /* NOTE: BAD_SEQID means the server and client disagree about the
1577                  * book-keeping w.r.t. state-changing operations
1578                  * (OPEN/CLOSE/LOCK/LOCKU...)
1579                  * It is actually a sign of a bug on the client or on the server.
1580                  *
1581                  * If we receive a BAD_SEQID error in the particular case of
1582                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1583                  * have unhashed the old state_owner for us, and that we can
1584                  * therefore safely retry using a new one. We should still warn
1585                  * the user though...
1586                  */
1587                 if (status == -NFS4ERR_BAD_SEQID) {
1588                         printk(KERN_WARNING "NFS: v4 server %s "
1589                                         " returned a bad sequence-id error!\n",
1590                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1591                         exception.retry = 1;
1592                         continue;
1593                 }
1594                 /*
1595                  * BAD_STATEID on OPEN means that the server cancelled our
1596                  * state before it received the OPEN_CONFIRM.
1597                  * Recover by retrying the request as per the discussion
1598                  * on Page 181 of RFC3530.
1599                  */
1600                 if (status == -NFS4ERR_BAD_STATEID) {
1601                         exception.retry = 1;
1602                         continue;
1603                 }
1604                 if (status == -EAGAIN) {
1605                         /* We must have found a delegation */
1606                         exception.retry = 1;
1607                         continue;
1608                 }
1609                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1610                                         status, &exception));
1611         } while (exception.retry);
1612         return res;
1613 }
1614
1615 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1616                             struct nfs_fattr *fattr, struct iattr *sattr,
1617                             struct nfs4_state *state)
1618 {
1619         struct nfs_server *server = NFS_SERVER(inode);
1620         struct nfs_setattrargs  arg = {
1621                 .fh             = NFS_FH(inode),
1622                 .iap            = sattr,
1623                 .server         = server,
1624                 .bitmask = server->attr_bitmask,
1625         };
1626         struct nfs_setattrres  res = {
1627                 .fattr          = fattr,
1628                 .server         = server,
1629         };
1630         struct rpc_message msg = {
1631                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1632                 .rpc_argp       = &arg,
1633                 .rpc_resp       = &res,
1634                 .rpc_cred       = cred,
1635         };
1636         unsigned long timestamp = jiffies;
1637         int status;
1638
1639         nfs_fattr_init(fattr);
1640
1641         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1642                 /* Use that stateid */
1643         } else if (state != NULL) {
1644                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1645         } else
1646                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1647
1648         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1649         if (status == 0 && state != NULL)
1650                 renew_lease(server, timestamp);
1651         return status;
1652 }
1653
1654 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1655                            struct nfs_fattr *fattr, struct iattr *sattr,
1656                            struct nfs4_state *state)
1657 {
1658         struct nfs_server *server = NFS_SERVER(inode);
1659         struct nfs4_exception exception = { };
1660         int err;
1661         do {
1662                 err = nfs4_handle_exception(server,
1663                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1664                                 &exception);
1665         } while (exception.retry);
1666         return err;
1667 }
1668
1669 struct nfs4_closedata {
1670         struct path path;
1671         struct inode *inode;
1672         struct nfs4_state *state;
1673         struct nfs_closeargs arg;
1674         struct nfs_closeres res;
1675         struct nfs_fattr fattr;
1676         unsigned long timestamp;
1677 };
1678
1679 static void nfs4_free_closedata(void *data)
1680 {
1681         struct nfs4_closedata *calldata = data;
1682         struct nfs4_state_owner *sp = calldata->state->owner;
1683
1684         nfs4_put_open_state(calldata->state);
1685         nfs_free_seqid(calldata->arg.seqid);
1686         nfs4_put_state_owner(sp);
1687         path_put(&calldata->path);
1688         kfree(calldata);
1689 }
1690
1691 static void nfs4_close_done(struct rpc_task *task, void *data)
1692 {
1693         struct nfs4_closedata *calldata = data;
1694         struct nfs4_state *state = calldata->state;
1695         struct nfs_server *server = NFS_SERVER(calldata->inode);
1696
1697         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1698         if (RPC_ASSASSINATED(task))
1699                 return;
1700         /* hmm. we are done with the inode, and in the process of freeing
1701          * the state_owner. we keep this around to process errors
1702          */
1703         switch (task->tk_status) {
1704                 case 0:
1705                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1706                         renew_lease(server, calldata->timestamp);
1707                         break;
1708                 case -NFS4ERR_STALE_STATEID:
1709                 case -NFS4ERR_OLD_STATEID:
1710                 case -NFS4ERR_BAD_STATEID:
1711                 case -NFS4ERR_EXPIRED:
1712                         if (calldata->arg.fmode == 0)
1713                                 break;
1714                 default:
1715                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1716                                 nfs4_restart_rpc(task, server->nfs_client);
1717                                 return;
1718                         }
1719         }
1720         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1721         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1722 }
1723
1724 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1725 {
1726         struct nfs4_closedata *calldata = data;
1727         struct nfs4_state *state = calldata->state;
1728         int clear_rd, clear_wr, clear_rdwr;
1729
1730         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1731                 return;
1732
1733         clear_rd = clear_wr = clear_rdwr = 0;
1734         spin_lock(&state->owner->so_lock);
1735         /* Calculate the change in open mode */
1736         if (state->n_rdwr == 0) {
1737                 if (state->n_rdonly == 0) {
1738                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1739                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1740                 }
1741                 if (state->n_wronly == 0) {
1742                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1743                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1744                 }
1745         }
1746         spin_unlock(&state->owner->so_lock);
1747         if (!clear_rd && !clear_wr && !clear_rdwr) {
1748                 /* Note: exit _without_ calling nfs4_close_done */
1749                 task->tk_action = NULL;
1750                 return;
1751         }
1752         nfs_fattr_init(calldata->res.fattr);
1753         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1754                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1755                 calldata->arg.fmode = FMODE_READ;
1756         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1757                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1758                 calldata->arg.fmode = FMODE_WRITE;
1759         }
1760         calldata->timestamp = jiffies;
1761         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1762                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1763                                 1, task))
1764                 return;
1765         rpc_call_start(task);
1766 }
1767
1768 static const struct rpc_call_ops nfs4_close_ops = {
1769         .rpc_call_prepare = nfs4_close_prepare,
1770         .rpc_call_done = nfs4_close_done,
1771         .rpc_release = nfs4_free_closedata,
1772 };
1773
1774 /*
1775  * It is possible for data to be read/written from a mem-mapped file
1776  * after the sys_close call (which hits the vfs layer as a flush).
1777  * This means that we can't safely call nfsv4 close on a file until
1778  * the inode is cleared. This in turn means that we are not good
1779  * NFSv4 citizens - we do not indicate to the server to update the file's
1780  * share state even when we are done with one of the three share
1781  * stateid's in the inode.
1782  *
1783  * NOTE: Caller must be holding the sp->so_owner semaphore!
1784  */
1785 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1786 {
1787         struct nfs_server *server = NFS_SERVER(state->inode);
1788         struct nfs4_closedata *calldata;
1789         struct nfs4_state_owner *sp = state->owner;
1790         struct rpc_task *task;
1791         struct rpc_message msg = {
1792                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1793                 .rpc_cred = state->owner->so_cred,
1794         };
1795         struct rpc_task_setup task_setup_data = {
1796                 .rpc_client = server->client,
1797                 .rpc_message = &msg,
1798                 .callback_ops = &nfs4_close_ops,
1799                 .workqueue = nfsiod_workqueue,
1800                 .flags = RPC_TASK_ASYNC,
1801         };
1802         int status = -ENOMEM;
1803
1804         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1805         if (calldata == NULL)
1806                 goto out;
1807         calldata->inode = state->inode;
1808         calldata->state = state;
1809         calldata->arg.fh = NFS_FH(state->inode);
1810         calldata->arg.stateid = &state->open_stateid;
1811         if (nfs4_has_session(server->nfs_client))
1812                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1813         /* Serialization for the sequence id */
1814         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1815         if (calldata->arg.seqid == NULL)
1816                 goto out_free_calldata;
1817         calldata->arg.fmode = 0;
1818         calldata->arg.bitmask = server->cache_consistency_bitmask;
1819         calldata->res.fattr = &calldata->fattr;
1820         calldata->res.seqid = calldata->arg.seqid;
1821         calldata->res.server = server;
1822         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1823         calldata->path.mnt = mntget(path->mnt);
1824         calldata->path.dentry = dget(path->dentry);
1825
1826         msg.rpc_argp = &calldata->arg,
1827         msg.rpc_resp = &calldata->res,
1828         task_setup_data.callback_data = calldata;
1829         task = rpc_run_task(&task_setup_data);
1830         if (IS_ERR(task))
1831                 return PTR_ERR(task);
1832         status = 0;
1833         if (wait)
1834                 status = rpc_wait_for_completion_task(task);
1835         rpc_put_task(task);
1836         return status;
1837 out_free_calldata:
1838         kfree(calldata);
1839 out:
1840         nfs4_put_open_state(state);
1841         nfs4_put_state_owner(sp);
1842         return status;
1843 }
1844
1845 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1846 {
1847         struct file *filp;
1848         int ret;
1849
1850         /* If the open_intent is for execute, we have an extra check to make */
1851         if (fmode & FMODE_EXEC) {
1852                 ret = nfs_may_open(state->inode,
1853                                 state->owner->so_cred,
1854                                 nd->intent.open.flags);
1855                 if (ret < 0)
1856                         goto out_close;
1857         }
1858         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1859         if (!IS_ERR(filp)) {
1860                 struct nfs_open_context *ctx;
1861                 ctx = nfs_file_open_context(filp);
1862                 ctx->state = state;
1863                 return 0;
1864         }
1865         ret = PTR_ERR(filp);
1866 out_close:
1867         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1868         return ret;
1869 }
1870
1871 struct dentry *
1872 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1873 {
1874         struct path path = {
1875                 .mnt = nd->path.mnt,
1876                 .dentry = dentry,
1877         };
1878         struct dentry *parent;
1879         struct iattr attr;
1880         struct rpc_cred *cred;
1881         struct nfs4_state *state;
1882         struct dentry *res;
1883         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1884
1885         if (nd->flags & LOOKUP_CREATE) {
1886                 attr.ia_mode = nd->intent.open.create_mode;
1887                 attr.ia_valid = ATTR_MODE;
1888                 if (!IS_POSIXACL(dir))
1889                         attr.ia_mode &= ~current_umask();
1890         } else {
1891                 attr.ia_valid = 0;
1892                 BUG_ON(nd->intent.open.flags & O_CREAT);
1893         }
1894
1895         cred = rpc_lookup_cred();
1896         if (IS_ERR(cred))
1897                 return (struct dentry *)cred;
1898         parent = dentry->d_parent;
1899         /* Protect against concurrent sillydeletes */
1900         nfs_block_sillyrename(parent);
1901         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1902         put_rpccred(cred);
1903         if (IS_ERR(state)) {
1904                 if (PTR_ERR(state) == -ENOENT) {
1905                         d_add(dentry, NULL);
1906                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1907                 }
1908                 nfs_unblock_sillyrename(parent);
1909                 return (struct dentry *)state;
1910         }
1911         res = d_add_unique(dentry, igrab(state->inode));
1912         if (res != NULL)
1913                 path.dentry = res;
1914         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1915         nfs_unblock_sillyrename(parent);
1916         nfs4_intent_set_file(nd, &path, state, fmode);
1917         return res;
1918 }
1919
1920 int
1921 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1922 {
1923         struct path path = {
1924                 .mnt = nd->path.mnt,
1925                 .dentry = dentry,
1926         };
1927         struct rpc_cred *cred;
1928         struct nfs4_state *state;
1929         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1930
1931         cred = rpc_lookup_cred();
1932         if (IS_ERR(cred))
1933                 return PTR_ERR(cred);
1934         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1935         put_rpccred(cred);
1936         if (IS_ERR(state)) {
1937                 switch (PTR_ERR(state)) {
1938                         case -EPERM:
1939                         case -EACCES:
1940                         case -EDQUOT:
1941                         case -ENOSPC:
1942                         case -EROFS:
1943                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1944                                 return 1;
1945                         default:
1946                                 goto out_drop;
1947                 }
1948         }
1949         if (state->inode == dentry->d_inode) {
1950                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1951                 nfs4_intent_set_file(nd, &path, state, fmode);
1952                 return 1;
1953         }
1954         nfs4_close_sync(&path, state, fmode);
1955 out_drop:
1956         d_drop(dentry);
1957         return 0;
1958 }
1959
1960 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1961 {
1962         if (ctx->state == NULL)
1963                 return;
1964         if (is_sync)
1965                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1966         else
1967                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1968 }
1969
1970 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1971 {
1972         struct nfs4_server_caps_arg args = {
1973                 .fhandle = fhandle,
1974         };
1975         struct nfs4_server_caps_res res = {};
1976         struct rpc_message msg = {
1977                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1978                 .rpc_argp = &args,
1979                 .rpc_resp = &res,
1980         };
1981         int status;
1982
1983         status = nfs4_call_sync(server, &msg, &args, &res, 0);
1984         if (status == 0) {
1985                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1986                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1987                         server->caps |= NFS_CAP_ACLS;
1988                 if (res.has_links != 0)
1989                         server->caps |= NFS_CAP_HARDLINKS;
1990                 if (res.has_symlinks != 0)
1991                         server->caps |= NFS_CAP_SYMLINKS;
1992                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
1993                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
1994                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1995                 server->acl_bitmask = res.acl_bitmask;
1996         }
1997
1998         return status;
1999 }
2000
2001 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2002 {
2003         struct nfs4_exception exception = { };
2004         int err;
2005         do {
2006                 err = nfs4_handle_exception(server,
2007                                 _nfs4_server_capabilities(server, fhandle),
2008                                 &exception);
2009         } while (exception.retry);
2010         return err;
2011 }
2012
2013 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2014                 struct nfs_fsinfo *info)
2015 {
2016         struct nfs4_lookup_root_arg args = {
2017                 .bitmask = nfs4_fattr_bitmap,
2018         };
2019         struct nfs4_lookup_res res = {
2020                 .server = server,
2021                 .fattr = info->fattr,
2022                 .fh = fhandle,
2023         };
2024         struct rpc_message msg = {
2025                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2026                 .rpc_argp = &args,
2027                 .rpc_resp = &res,
2028         };
2029         int status;
2030
2031         nfs_fattr_init(info->fattr);
2032         status = nfs4_recover_expired_lease(server);
2033         if (!status)
2034                 status = nfs4_check_client_ready(server->nfs_client);
2035         if (!status)
2036                 status = nfs4_call_sync(server, &msg, &args, &res, 0);
2037         return status;
2038 }
2039
2040 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2041                 struct nfs_fsinfo *info)
2042 {
2043         struct nfs4_exception exception = { };
2044         int err;
2045         do {
2046                 err = nfs4_handle_exception(server,
2047                                 _nfs4_lookup_root(server, fhandle, info),
2048                                 &exception);
2049         } while (exception.retry);
2050         return err;
2051 }
2052
2053 /*
2054  * get the file handle for the "/" directory on the server
2055  */
2056 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2057                               struct nfs_fsinfo *info)
2058 {
2059         int status;
2060
2061         status = nfs4_lookup_root(server, fhandle, info);
2062         if (status == 0)
2063                 status = nfs4_server_capabilities(server, fhandle);
2064         if (status == 0)
2065                 status = nfs4_do_fsinfo(server, fhandle, info);
2066         return nfs4_map_errors(status);
2067 }
2068
2069 /*
2070  * Get locations and (maybe) other attributes of a referral.
2071  * Note that we'll actually follow the referral later when
2072  * we detect fsid mismatch in inode revalidation
2073  */
2074 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2075 {
2076         int status = -ENOMEM;
2077         struct page *page = NULL;
2078         struct nfs4_fs_locations *locations = NULL;
2079
2080         page = alloc_page(GFP_KERNEL);
2081         if (page == NULL)
2082                 goto out;
2083         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2084         if (locations == NULL)
2085                 goto out;
2086
2087         status = nfs4_proc_fs_locations(dir, name, locations, page);
2088         if (status != 0)
2089                 goto out;
2090         /* Make sure server returned a different fsid for the referral */
2091         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2092                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2093                 status = -EIO;
2094                 goto out;
2095         }
2096
2097         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2098         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2099         if (!fattr->mode)
2100                 fattr->mode = S_IFDIR;
2101         memset(fhandle, 0, sizeof(struct nfs_fh));
2102 out:
2103         if (page)
2104                 __free_page(page);
2105         if (locations)
2106                 kfree(locations);
2107         return status;
2108 }
2109
2110 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2111 {
2112         struct nfs4_getattr_arg args = {
2113                 .fh = fhandle,
2114                 .bitmask = server->attr_bitmask,
2115         };
2116         struct nfs4_getattr_res res = {
2117                 .fattr = fattr,
2118                 .server = server,
2119         };
2120         struct rpc_message msg = {
2121                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2122                 .rpc_argp = &args,
2123                 .rpc_resp = &res,
2124         };
2125
2126         nfs_fattr_init(fattr);
2127         return nfs4_call_sync(server, &msg, &args, &res, 0);
2128 }
2129
2130 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2131 {
2132         struct nfs4_exception exception = { };
2133         int err;
2134         do {
2135                 err = nfs4_handle_exception(server,
2136                                 _nfs4_proc_getattr(server, fhandle, fattr),
2137                                 &exception);
2138         } while (exception.retry);
2139         return err;
2140 }
2141
2142 /*
2143  * The file is not closed if it is opened due to the a request to change
2144  * the size of the file. The open call will not be needed once the
2145  * VFS layer lookup-intents are implemented.
2146  *
2147  * Close is called when the inode is destroyed.
2148  * If we haven't opened the file for O_WRONLY, we
2149  * need to in the size_change case to obtain a stateid.
2150  *
2151  * Got race?
2152  * Because OPEN is always done by name in nfsv4, it is
2153  * possible that we opened a different file by the same
2154  * name.  We can recognize this race condition, but we
2155  * can't do anything about it besides returning an error.
2156  *
2157  * This will be fixed with VFS changes (lookup-intent).
2158  */
2159 static int
2160 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2161                   struct iattr *sattr)
2162 {
2163         struct inode *inode = dentry->d_inode;
2164         struct rpc_cred *cred = NULL;
2165         struct nfs4_state *state = NULL;
2166         int status;
2167
2168         nfs_fattr_init(fattr);
2169
2170         /* Search for an existing open(O_WRITE) file */
2171         if (sattr->ia_valid & ATTR_FILE) {
2172                 struct nfs_open_context *ctx;
2173
2174                 ctx = nfs_file_open_context(sattr->ia_file);
2175                 if (ctx) {
2176                         cred = ctx->cred;
2177                         state = ctx->state;
2178                 }
2179         }
2180
2181         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2182         if (status == 0)
2183                 nfs_setattr_update_inode(inode, sattr);
2184         return status;
2185 }
2186
2187 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2188                 const struct qstr *name, struct nfs_fh *fhandle,
2189                 struct nfs_fattr *fattr)
2190 {
2191         int                    status;
2192         struct nfs4_lookup_arg args = {
2193                 .bitmask = server->attr_bitmask,
2194                 .dir_fh = dirfh,
2195                 .name = name,
2196         };
2197         struct nfs4_lookup_res res = {
2198                 .server = server,
2199                 .fattr = fattr,
2200                 .fh = fhandle,
2201         };
2202         struct rpc_message msg = {
2203                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2204                 .rpc_argp = &args,
2205                 .rpc_resp = &res,
2206         };
2207
2208         nfs_fattr_init(fattr);
2209
2210         dprintk("NFS call  lookupfh %s\n", name->name);
2211         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2212         dprintk("NFS reply lookupfh: %d\n", status);
2213         return status;
2214 }
2215
2216 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2217                               struct qstr *name, struct nfs_fh *fhandle,
2218                               struct nfs_fattr *fattr)
2219 {
2220         struct nfs4_exception exception = { };
2221         int err;
2222         do {
2223                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2224                 /* FIXME: !!!! */
2225                 if (err == -NFS4ERR_MOVED) {
2226                         err = -EREMOTE;
2227                         break;
2228                 }
2229                 err = nfs4_handle_exception(server, err, &exception);
2230         } while (exception.retry);
2231         return err;
2232 }
2233
2234 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2235                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2236 {
2237         int status;
2238
2239         dprintk("NFS call  lookup %s\n", name->name);
2240         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2241         if (status == -NFS4ERR_MOVED)
2242                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2243         dprintk("NFS reply lookup: %d\n", status);
2244         return status;
2245 }
2246
2247 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2248 {
2249         struct nfs4_exception exception = { };
2250         int err;
2251         do {
2252                 err = nfs4_handle_exception(NFS_SERVER(dir),
2253                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2254                                 &exception);
2255         } while (exception.retry);
2256         return err;
2257 }
2258
2259 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2260 {
2261         struct nfs_server *server = NFS_SERVER(inode);
2262         struct nfs_fattr fattr;
2263         struct nfs4_accessargs args = {
2264                 .fh = NFS_FH(inode),
2265                 .bitmask = server->attr_bitmask,
2266         };
2267         struct nfs4_accessres res = {
2268                 .server = server,
2269                 .fattr = &fattr,
2270         };
2271         struct rpc_message msg = {
2272                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2273                 .rpc_argp = &args,
2274                 .rpc_resp = &res,
2275                 .rpc_cred = entry->cred,
2276         };
2277         int mode = entry->mask;
2278         int status;
2279
2280         /*
2281          * Determine which access bits we want to ask for...
2282          */
2283         if (mode & MAY_READ)
2284                 args.access |= NFS4_ACCESS_READ;
2285         if (S_ISDIR(inode->i_mode)) {
2286                 if (mode & MAY_WRITE)
2287                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2288                 if (mode & MAY_EXEC)
2289                         args.access |= NFS4_ACCESS_LOOKUP;
2290         } else {
2291                 if (mode & MAY_WRITE)
2292                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2293                 if (mode & MAY_EXEC)
2294                         args.access |= NFS4_ACCESS_EXECUTE;
2295         }
2296         nfs_fattr_init(&fattr);
2297         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2298         if (!status) {
2299                 entry->mask = 0;
2300                 if (res.access & NFS4_ACCESS_READ)
2301                         entry->mask |= MAY_READ;
2302                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2303                         entry->mask |= MAY_WRITE;
2304                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2305                         entry->mask |= MAY_EXEC;
2306                 nfs_refresh_inode(inode, &fattr);
2307         }
2308         return status;
2309 }
2310
2311 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2312 {
2313         struct nfs4_exception exception = { };
2314         int err;
2315         do {
2316                 err = nfs4_handle_exception(NFS_SERVER(inode),
2317                                 _nfs4_proc_access(inode, entry),
2318                                 &exception);
2319         } while (exception.retry);
2320         return err;
2321 }
2322
2323 /*
2324  * TODO: For the time being, we don't try to get any attributes
2325  * along with any of the zero-copy operations READ, READDIR,
2326  * READLINK, WRITE.
2327  *
2328  * In the case of the first three, we want to put the GETATTR
2329  * after the read-type operation -- this is because it is hard
2330  * to predict the length of a GETATTR response in v4, and thus
2331  * align the READ data correctly.  This means that the GETATTR
2332  * may end up partially falling into the page cache, and we should
2333  * shift it into the 'tail' of the xdr_buf before processing.
2334  * To do this efficiently, we need to know the total length
2335  * of data received, which doesn't seem to be available outside
2336  * of the RPC layer.
2337  *
2338  * In the case of WRITE, we also want to put the GETATTR after
2339  * the operation -- in this case because we want to make sure
2340  * we get the post-operation mtime and size.  This means that
2341  * we can't use xdr_encode_pages() as written: we need a variant
2342  * of it which would leave room in the 'tail' iovec.
2343  *
2344  * Both of these changes to the XDR layer would in fact be quite
2345  * minor, but I decided to leave them for a subsequent patch.
2346  */
2347 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2348                 unsigned int pgbase, unsigned int pglen)
2349 {
2350         struct nfs4_readlink args = {
2351                 .fh       = NFS_FH(inode),
2352                 .pgbase   = pgbase,
2353                 .pglen    = pglen,
2354                 .pages    = &page,
2355         };
2356         struct nfs4_readlink_res res;
2357         struct rpc_message msg = {
2358                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2359                 .rpc_argp = &args,
2360                 .rpc_resp = &res,
2361         };
2362
2363         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2364 }
2365
2366 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2367                 unsigned int pgbase, unsigned int pglen)
2368 {
2369         struct nfs4_exception exception = { };
2370         int err;
2371         do {
2372                 err = nfs4_handle_exception(NFS_SERVER(inode),
2373                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2374                                 &exception);
2375         } while (exception.retry);
2376         return err;
2377 }
2378
2379 /*
2380  * Got race?
2381  * We will need to arrange for the VFS layer to provide an atomic open.
2382  * Until then, this create/open method is prone to inefficiency and race
2383  * conditions due to the lookup, create, and open VFS calls from sys_open()
2384  * placed on the wire.
2385  *
2386  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2387  * The file will be opened again in the subsequent VFS open call
2388  * (nfs4_proc_file_open).
2389  *
2390  * The open for read will just hang around to be used by any process that
2391  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2392  */
2393
2394 static int
2395 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2396                  int flags, struct nameidata *nd)
2397 {
2398         struct path path = {
2399                 .mnt = nd->path.mnt,
2400                 .dentry = dentry,
2401         };
2402         struct nfs4_state *state;
2403         struct rpc_cred *cred;
2404         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2405         int status = 0;
2406
2407         cred = rpc_lookup_cred();
2408         if (IS_ERR(cred)) {
2409                 status = PTR_ERR(cred);
2410                 goto out;
2411         }
2412         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2413         d_drop(dentry);
2414         if (IS_ERR(state)) {
2415                 status = PTR_ERR(state);
2416                 goto out_putcred;
2417         }
2418         d_add(dentry, igrab(state->inode));
2419         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2420         if (flags & O_EXCL) {
2421                 struct nfs_fattr fattr;
2422                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2423                 if (status == 0)
2424                         nfs_setattr_update_inode(state->inode, sattr);
2425                 nfs_post_op_update_inode(state->inode, &fattr);
2426         }
2427         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2428                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2429         else
2430                 nfs4_close_sync(&path, state, fmode);
2431 out_putcred:
2432         put_rpccred(cred);
2433 out:
2434         return status;
2435 }
2436
2437 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2438 {
2439         struct nfs_server *server = NFS_SERVER(dir);
2440         struct nfs_removeargs args = {
2441                 .fh = NFS_FH(dir),
2442                 .name.len = name->len,
2443                 .name.name = name->name,
2444                 .bitmask = server->attr_bitmask,
2445         };
2446         struct nfs_removeres res = {
2447                 .server = server,
2448         };
2449         struct rpc_message msg = {
2450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2451                 .rpc_argp = &args,
2452                 .rpc_resp = &res,
2453         };
2454         int                     status;
2455
2456         nfs_fattr_init(&res.dir_attr);
2457         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2458         if (status == 0) {
2459                 update_changeattr(dir, &res.cinfo);
2460                 nfs_post_op_update_inode(dir, &res.dir_attr);
2461         }
2462         return status;
2463 }
2464
2465 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2466 {
2467         struct nfs4_exception exception = { };
2468         int err;
2469         do {
2470                 err = nfs4_handle_exception(NFS_SERVER(dir),
2471                                 _nfs4_proc_remove(dir, name),
2472                                 &exception);
2473         } while (exception.retry);
2474         return err;
2475 }
2476
2477 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2478 {
2479         struct nfs_server *server = NFS_SERVER(dir);
2480         struct nfs_removeargs *args = msg->rpc_argp;
2481         struct nfs_removeres *res = msg->rpc_resp;
2482
2483         args->bitmask = server->cache_consistency_bitmask;
2484         res->server = server;
2485         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2486 }
2487
2488 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2489 {
2490         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2491
2492         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2493         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2494                 return 0;
2495         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2496         update_changeattr(dir, &res->cinfo);
2497         nfs_post_op_update_inode(dir, &res->dir_attr);
2498         return 1;
2499 }
2500
2501 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2502                 struct inode *new_dir, struct qstr *new_name)
2503 {
2504         struct nfs_server *server = NFS_SERVER(old_dir);
2505         struct nfs4_rename_arg arg = {
2506                 .old_dir = NFS_FH(old_dir),
2507                 .new_dir = NFS_FH(new_dir),
2508                 .old_name = old_name,
2509                 .new_name = new_name,
2510                 .bitmask = server->attr_bitmask,
2511         };
2512         struct nfs_fattr old_fattr, new_fattr;
2513         struct nfs4_rename_res res = {
2514                 .server = server,
2515                 .old_fattr = &old_fattr,
2516                 .new_fattr = &new_fattr,
2517         };
2518         struct rpc_message msg = {
2519                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2520                 .rpc_argp = &arg,
2521                 .rpc_resp = &res,
2522         };
2523         int                     status;
2524
2525         nfs_fattr_init(res.old_fattr);
2526         nfs_fattr_init(res.new_fattr);
2527         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2528
2529         if (!status) {
2530                 update_changeattr(old_dir, &res.old_cinfo);
2531                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2532                 update_changeattr(new_dir, &res.new_cinfo);
2533                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2534         }
2535         return status;
2536 }
2537
2538 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2539                 struct inode *new_dir, struct qstr *new_name)
2540 {
2541         struct nfs4_exception exception = { };
2542         int err;
2543         do {
2544                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2545                                 _nfs4_proc_rename(old_dir, old_name,
2546                                         new_dir, new_name),
2547                                 &exception);
2548         } while (exception.retry);
2549         return err;
2550 }
2551
2552 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2553 {
2554         struct nfs_server *server = NFS_SERVER(inode);
2555         struct nfs4_link_arg arg = {
2556                 .fh     = NFS_FH(inode),
2557                 .dir_fh = NFS_FH(dir),
2558                 .name   = name,
2559                 .bitmask = server->attr_bitmask,
2560         };
2561         struct nfs_fattr fattr, dir_attr;
2562         struct nfs4_link_res res = {
2563                 .server = server,
2564                 .fattr = &fattr,
2565                 .dir_attr = &dir_attr,
2566         };
2567         struct rpc_message msg = {
2568                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2569                 .rpc_argp = &arg,
2570                 .rpc_resp = &res,
2571         };
2572         int                     status;
2573
2574         nfs_fattr_init(res.fattr);
2575         nfs_fattr_init(res.dir_attr);
2576         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2577         if (!status) {
2578                 update_changeattr(dir, &res.cinfo);
2579                 nfs_post_op_update_inode(dir, res.dir_attr);
2580                 nfs_post_op_update_inode(inode, res.fattr);
2581         }
2582
2583         return status;
2584 }
2585
2586 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2587 {
2588         struct nfs4_exception exception = { };
2589         int err;
2590         do {
2591                 err = nfs4_handle_exception(NFS_SERVER(inode),
2592                                 _nfs4_proc_link(inode, dir, name),
2593                                 &exception);
2594         } while (exception.retry);
2595         return err;
2596 }
2597
2598 struct nfs4_createdata {
2599         struct rpc_message msg;
2600         struct nfs4_create_arg arg;
2601         struct nfs4_create_res res;
2602         struct nfs_fh fh;
2603         struct nfs_fattr fattr;
2604         struct nfs_fattr dir_fattr;
2605 };
2606
2607 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2608                 struct qstr *name, struct iattr *sattr, u32 ftype)
2609 {
2610         struct nfs4_createdata *data;
2611
2612         data = kzalloc(sizeof(*data), GFP_KERNEL);
2613         if (data != NULL) {
2614                 struct nfs_server *server = NFS_SERVER(dir);
2615
2616                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2617                 data->msg.rpc_argp = &data->arg;
2618                 data->msg.rpc_resp = &data->res;
2619                 data->arg.dir_fh = NFS_FH(dir);
2620                 data->arg.server = server;
2621                 data->arg.name = name;
2622                 data->arg.attrs = sattr;
2623                 data->arg.ftype = ftype;
2624                 data->arg.bitmask = server->attr_bitmask;
2625                 data->res.server = server;
2626                 data->res.fh = &data->fh;
2627                 data->res.fattr = &data->fattr;
2628                 data->res.dir_fattr = &data->dir_fattr;
2629                 nfs_fattr_init(data->res.fattr);
2630                 nfs_fattr_init(data->res.dir_fattr);
2631         }
2632         return data;
2633 }
2634
2635 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2636 {
2637         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2638                                     &data->arg, &data->res, 1);
2639         if (status == 0) {
2640                 update_changeattr(dir, &data->res.dir_cinfo);
2641                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2642                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2643         }
2644         return status;
2645 }
2646
2647 static void nfs4_free_createdata(struct nfs4_createdata *data)
2648 {
2649         kfree(data);
2650 }
2651
2652 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2653                 struct page *page, unsigned int len, struct iattr *sattr)
2654 {
2655         struct nfs4_createdata *data;
2656         int status = -ENAMETOOLONG;
2657
2658         if (len > NFS4_MAXPATHLEN)
2659                 goto out;
2660
2661         status = -ENOMEM;
2662         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2663         if (data == NULL)
2664                 goto out;
2665
2666         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2667         data->arg.u.symlink.pages = &page;
2668         data->arg.u.symlink.len = len;
2669
2670         status = nfs4_do_create(dir, dentry, data);
2671
2672         nfs4_free_createdata(data);
2673 out:
2674         return status;
2675 }
2676
2677 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2678                 struct page *page, unsigned int len, struct iattr *sattr)
2679 {
2680         struct nfs4_exception exception = { };
2681         int err;
2682         do {
2683                 err = nfs4_handle_exception(NFS_SERVER(dir),
2684                                 _nfs4_proc_symlink(dir, dentry, page,
2685                                                         len, sattr),
2686                                 &exception);
2687         } while (exception.retry);
2688         return err;
2689 }
2690
2691 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2692                 struct iattr *sattr)
2693 {
2694         struct nfs4_createdata *data;
2695         int status = -ENOMEM;
2696
2697         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2698         if (data == NULL)
2699                 goto out;
2700
2701         status = nfs4_do_create(dir, dentry, data);
2702
2703         nfs4_free_createdata(data);
2704 out:
2705         return status;
2706 }
2707
2708 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2709                 struct iattr *sattr)
2710 {
2711         struct nfs4_exception exception = { };
2712         int err;
2713         do {
2714                 err = nfs4_handle_exception(NFS_SERVER(dir),
2715                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2716                                 &exception);
2717         } while (exception.retry);
2718         return err;
2719 }
2720
2721 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2722                   u64 cookie, struct page *page, unsigned int count, int plus)
2723 {
2724         struct inode            *dir = dentry->d_inode;
2725         struct nfs4_readdir_arg args = {
2726                 .fh = NFS_FH(dir),
2727                 .pages = &page,
2728                 .pgbase = 0,
2729                 .count = count,
2730                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2731         };
2732         struct nfs4_readdir_res res;
2733         struct rpc_message msg = {
2734                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2735                 .rpc_argp = &args,
2736                 .rpc_resp = &res,
2737                 .rpc_cred = cred,
2738         };
2739         int                     status;
2740
2741         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2742                         dentry->d_parent->d_name.name,
2743                         dentry->d_name.name,
2744                         (unsigned long long)cookie);
2745         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2746         res.pgbase = args.pgbase;
2747         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2748         if (status == 0)
2749                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2750
2751         nfs_invalidate_atime(dir);
2752
2753         dprintk("%s: returns %d\n", __func__, status);
2754         return status;
2755 }
2756
2757 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2758                   u64 cookie, struct page *page, unsigned int count, int plus)
2759 {
2760         struct nfs4_exception exception = { };
2761         int err;
2762         do {
2763                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2764                                 _nfs4_proc_readdir(dentry, cred, cookie,
2765                                         page, count, plus),
2766                                 &exception);
2767         } while (exception.retry);
2768         return err;
2769 }
2770
2771 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2772                 struct iattr *sattr, dev_t rdev)
2773 {
2774         struct nfs4_createdata *data;
2775         int mode = sattr->ia_mode;
2776         int status = -ENOMEM;
2777
2778         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2779         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2780
2781         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2782         if (data == NULL)
2783                 goto out;
2784
2785         if (S_ISFIFO(mode))
2786                 data->arg.ftype = NF4FIFO;
2787         else if (S_ISBLK(mode)) {
2788                 data->arg.ftype = NF4BLK;
2789                 data->arg.u.device.specdata1 = MAJOR(rdev);
2790                 data->arg.u.device.specdata2 = MINOR(rdev);
2791         }
2792         else if (S_ISCHR(mode)) {
2793                 data->arg.ftype = NF4CHR;
2794                 data->arg.u.device.specdata1 = MAJOR(rdev);
2795                 data->arg.u.device.specdata2 = MINOR(rdev);
2796         }
2797
2798         status = nfs4_do_create(dir, dentry, data);
2799
2800         nfs4_free_createdata(data);
2801 out:
2802         return status;
2803 }
2804
2805 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2806                 struct iattr *sattr, dev_t rdev)
2807 {
2808         struct nfs4_exception exception = { };
2809         int err;
2810         do {
2811                 err = nfs4_handle_exception(NFS_SERVER(dir),
2812                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2813                                 &exception);
2814         } while (exception.retry);
2815         return err;
2816 }
2817
2818 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2819                  struct nfs_fsstat *fsstat)
2820 {
2821         struct nfs4_statfs_arg args = {
2822                 .fh = fhandle,
2823                 .bitmask = server->attr_bitmask,
2824         };
2825         struct nfs4_statfs_res res = {
2826                 .fsstat = fsstat,
2827         };
2828         struct rpc_message msg = {
2829                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2830                 .rpc_argp = &args,
2831                 .rpc_resp = &res,
2832         };
2833
2834         nfs_fattr_init(fsstat->fattr);
2835         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2836 }
2837
2838 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2839 {
2840         struct nfs4_exception exception = { };
2841         int err;
2842         do {
2843                 err = nfs4_handle_exception(server,
2844                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2845                                 &exception);
2846         } while (exception.retry);
2847         return err;
2848 }
2849
2850 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2851                 struct nfs_fsinfo *fsinfo)
2852 {
2853         struct nfs4_fsinfo_arg args = {
2854                 .fh = fhandle,
2855                 .bitmask = server->attr_bitmask,
2856         };
2857         struct nfs4_fsinfo_res res = {
2858                 .fsinfo = fsinfo,
2859         };
2860         struct rpc_message msg = {
2861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2862                 .rpc_argp = &args,
2863                 .rpc_resp = &res,
2864         };
2865
2866         return nfs4_call_sync(server, &msg, &args, &res, 0);
2867 }
2868
2869 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2870 {
2871         struct nfs4_exception exception = { };
2872         int err;
2873
2874         do {
2875                 err = nfs4_handle_exception(server,
2876                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2877                                 &exception);
2878         } while (exception.retry);
2879         return err;
2880 }
2881
2882 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2883 {
2884         nfs_fattr_init(fsinfo->fattr);
2885         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2886 }
2887
2888 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2889                 struct nfs_pathconf *pathconf)
2890 {
2891         struct nfs4_pathconf_arg args = {
2892                 .fh = fhandle,
2893                 .bitmask = server->attr_bitmask,
2894         };
2895         struct nfs4_pathconf_res res = {
2896                 .pathconf = pathconf,
2897         };
2898         struct rpc_message msg = {
2899                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2900                 .rpc_argp = &args,
2901                 .rpc_resp = &res,
2902         };
2903
2904         /* None of the pathconf attributes are mandatory to implement */
2905         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2906                 memset(pathconf, 0, sizeof(*pathconf));
2907                 return 0;
2908         }
2909
2910         nfs_fattr_init(pathconf->fattr);
2911         return nfs4_call_sync(server, &msg, &args, &res, 0);
2912 }
2913
2914 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2915                 struct nfs_pathconf *pathconf)
2916 {
2917         struct nfs4_exception exception = { };
2918         int err;
2919
2920         do {
2921                 err = nfs4_handle_exception(server,
2922                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2923                                 &exception);
2924         } while (exception.retry);
2925         return err;
2926 }
2927
2928 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2929 {
2930         struct nfs_server *server = NFS_SERVER(data->inode);
2931
2932         dprintk("--> %s\n", __func__);
2933
2934         /* nfs4_sequence_free_slot called in the read rpc_call_done */
2935         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2936
2937         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2938                 nfs4_restart_rpc(task, server->nfs_client);
2939                 return -EAGAIN;
2940         }
2941
2942         nfs_invalidate_atime(data->inode);
2943         if (task->tk_status > 0)
2944                 renew_lease(server, data->timestamp);
2945         return 0;
2946 }
2947
2948 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2949 {
2950         data->timestamp   = jiffies;
2951         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2952 }
2953
2954 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2955 {
2956         struct inode *inode = data->inode;
2957
2958         /* slot is freed in nfs_writeback_done */
2959         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2960                            task->tk_status);
2961
2962         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2963                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
2964                 return -EAGAIN;
2965         }
2966         if (task->tk_status >= 0) {
2967                 renew_lease(NFS_SERVER(inode), data->timestamp);
2968                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2969         }
2970         return 0;
2971 }
2972
2973 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2974 {
2975         struct nfs_server *server = NFS_SERVER(data->inode);
2976
2977         data->args.bitmask = server->cache_consistency_bitmask;
2978         data->res.server = server;
2979         data->timestamp   = jiffies;
2980
2981         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2982 }
2983
2984 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2985 {
2986         struct inode *inode = data->inode;
2987
2988         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2989                            task->tk_status);
2990         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2991                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
2992                 return -EAGAIN;
2993         }
2994         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
2995                                 &data->res.seq_res);
2996         nfs_refresh_inode(inode, data->res.fattr);
2997         return 0;
2998 }
2999
3000 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3001 {
3002         struct nfs_server *server = NFS_SERVER(data->inode);
3003
3004         data->args.bitmask = server->cache_consistency_bitmask;
3005         data->res.server = server;
3006         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3007 }
3008
3009 /*
3010  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3011  * standalone procedure for queueing an asynchronous RENEW.
3012  */
3013 static void nfs4_renew_done(struct rpc_task *task, void *data)
3014 {
3015         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3016         unsigned long timestamp = (unsigned long)data;
3017
3018         if (task->tk_status < 0) {
3019                 /* Unless we're shutting down, schedule state recovery! */
3020                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3021                         nfs4_schedule_state_recovery(clp);
3022                 return;
3023         }
3024         spin_lock(&clp->cl_lock);
3025         if (time_before(clp->cl_last_renewal,timestamp))
3026                 clp->cl_last_renewal = timestamp;
3027         spin_unlock(&clp->cl_lock);
3028         dprintk("%s calling put_rpccred on rpc_cred %p\n", __func__,
3029                                 task->tk_msg.rpc_cred);
3030         put_rpccred(task->tk_msg.rpc_cred);
3031 }
3032
3033 static const struct rpc_call_ops nfs4_renew_ops = {
3034         .rpc_call_done = nfs4_renew_done,
3035 };
3036
3037 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3038 {
3039         struct rpc_message msg = {
3040                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3041                 .rpc_argp       = clp,
3042                 .rpc_cred       = cred,
3043         };
3044
3045         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3046                         &nfs4_renew_ops, (void *)jiffies);
3047 }
3048
3049 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3050 {
3051         struct rpc_message msg = {
3052                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3053                 .rpc_argp       = clp,
3054                 .rpc_cred       = cred,
3055         };
3056         unsigned long now = jiffies;
3057         int status;
3058
3059         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3060         if (status < 0)
3061                 return status;
3062         spin_lock(&clp->cl_lock);
3063         if (time_before(clp->cl_last_renewal,now))
3064                 clp->cl_last_renewal = now;
3065         spin_unlock(&clp->cl_lock);
3066         return 0;
3067 }
3068
3069 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3070 {
3071         return (server->caps & NFS_CAP_ACLS)
3072                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3073                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3074 }
3075
3076 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3077  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3078  * the stack.
3079  */
3080 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3081
3082 static void buf_to_pages(const void *buf, size_t buflen,
3083                 struct page **pages, unsigned int *pgbase)
3084 {
3085         const void *p = buf;
3086
3087         *pgbase = offset_in_page(buf);
3088         p -= *pgbase;
3089         while (p < buf + buflen) {
3090                 *(pages++) = virt_to_page(p);
3091                 p += PAGE_CACHE_SIZE;
3092         }
3093 }
3094
3095 struct nfs4_cached_acl {
3096         int cached;
3097         size_t len;
3098         char data[0];
3099 };
3100
3101 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3102 {
3103         struct nfs_inode *nfsi = NFS_I(inode);
3104
3105         spin_lock(&inode->i_lock);
3106         kfree(nfsi->nfs4_acl);
3107         nfsi->nfs4_acl = acl;
3108         spin_unlock(&inode->i_lock);
3109 }
3110
3111 static void nfs4_zap_acl_attr(struct inode *inode)
3112 {
3113         nfs4_set_cached_acl(inode, NULL);
3114 }
3115
3116 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3117 {
3118         struct nfs_inode *nfsi = NFS_I(inode);
3119         struct nfs4_cached_acl *acl;
3120         int ret = -ENOENT;
3121
3122         spin_lock(&inode->i_lock);
3123         acl = nfsi->nfs4_acl;
3124         if (acl == NULL)
3125                 goto out;
3126         if (buf == NULL) /* user is just asking for length */
3127                 goto out_len;
3128         if (acl->cached == 0)
3129                 goto out;
3130         ret = -ERANGE; /* see getxattr(2) man page */
3131         if (acl->len > buflen)
3132                 goto out;
3133         memcpy(buf, acl->data, acl->len);
3134 out_len:
3135         ret = acl->len;
3136 out:
3137         spin_unlock(&inode->i_lock);
3138         return ret;
3139 }
3140
3141 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3142 {
3143         struct nfs4_cached_acl *acl;
3144
3145         if (buf && acl_len <= PAGE_SIZE) {
3146                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3147                 if (acl == NULL)
3148                         goto out;
3149                 acl->cached = 1;
3150                 memcpy(acl->data, buf, acl_len);
3151         } else {
3152                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3153                 if (acl == NULL)
3154                         goto out;
3155                 acl->cached = 0;
3156         }
3157         acl->len = acl_len;
3158 out:
3159         nfs4_set_cached_acl(inode, acl);
3160 }
3161
3162 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3163 {
3164         struct page *pages[NFS4ACL_MAXPAGES];
3165         struct nfs_getaclargs args = {
3166                 .fh = NFS_FH(inode),
3167                 .acl_pages = pages,
3168                 .acl_len = buflen,
3169         };
3170         struct nfs_getaclres res = {
3171                 .acl_len = buflen,
3172         };
3173         void *resp_buf;
3174         struct rpc_message msg = {
3175                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3176                 .rpc_argp = &args,
3177                 .rpc_resp = &res,
3178         };
3179         struct page *localpage = NULL;
3180         int ret;
3181
3182         if (buflen < PAGE_SIZE) {
3183                 /* As long as we're doing a round trip to the server anyway,
3184                  * let's be prepared for a page of acl data. */
3185                 localpage = alloc_page(GFP_KERNEL);
3186                 resp_buf = page_address(localpage);
3187                 if (localpage == NULL)
3188                         return -ENOMEM;
3189                 args.acl_pages[0] = localpage;
3190                 args.acl_pgbase = 0;
3191                 args.acl_len = PAGE_SIZE;
3192         } else {
3193                 resp_buf = buf;
3194                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3195         }
3196         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3197         if (ret)
3198                 goto out_free;
3199         if (res.acl_len > args.acl_len)
3200                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3201         else
3202                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3203         if (buf) {
3204                 ret = -ERANGE;
3205                 if (res.acl_len > buflen)
3206                         goto out_free;
3207                 if (localpage)
3208                         memcpy(buf, resp_buf, res.acl_len);
3209         }
3210         ret = res.acl_len;
3211 out_free:
3212         if (localpage)
3213                 __free_page(localpage);
3214         return ret;
3215 }
3216
3217 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3218 {
3219         struct nfs4_exception exception = { };
3220         ssize_t ret;
3221         do {
3222                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3223                 if (ret >= 0)
3224                         break;
3225                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3226         } while (exception.retry);
3227         return ret;
3228 }
3229
3230 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3231 {
3232         struct nfs_server *server = NFS_SERVER(inode);
3233         int ret;
3234
3235         if (!nfs4_server_supports_acls(server))
3236                 return -EOPNOTSUPP;
3237         ret = nfs_revalidate_inode(server, inode);
3238         if (ret < 0)
3239                 return ret;
3240         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3241                 nfs_zap_acl_cache(inode);
3242         ret = nfs4_read_cached_acl(inode, buf, buflen);
3243         if (ret != -ENOENT)
3244                 return ret;
3245         return nfs4_get_acl_uncached(inode, buf, buflen);
3246 }
3247
3248 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3249 {
3250         struct nfs_server *server = NFS_SERVER(inode);
3251         struct page *pages[NFS4ACL_MAXPAGES];
3252         struct nfs_setaclargs arg = {
3253                 .fh             = NFS_FH(inode),
3254                 .acl_pages      = pages,
3255                 .acl_len        = buflen,
3256         };
3257         struct nfs_setaclres res;
3258         struct rpc_message msg = {
3259                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3260                 .rpc_argp       = &arg,
3261                 .rpc_resp       = &res,
3262         };
3263         int ret;
3264
3265         if (!nfs4_server_supports_acls(server))
3266                 return -EOPNOTSUPP;
3267         nfs_inode_return_delegation(inode);
3268         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3269         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3270         nfs_access_zap_cache(inode);
3271         nfs_zap_acl_cache(inode);
3272         return ret;
3273 }
3274
3275 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3276 {
3277         struct nfs4_exception exception = { };
3278         int err;
3279         do {
3280                 err = nfs4_handle_exception(NFS_SERVER(inode),
3281                                 __nfs4_proc_set_acl(inode, buf, buflen),
3282                                 &exception);
3283         } while (exception.retry);
3284         return err;
3285 }
3286
3287 static int
3288 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3289 {
3290         if (!clp || task->tk_status >= 0)
3291                 return 0;
3292         switch(task->tk_status) {
3293                 case -NFS4ERR_ADMIN_REVOKED:
3294                 case -NFS4ERR_BAD_STATEID:
3295                 case -NFS4ERR_OPENMODE:
3296                         if (state == NULL)
3297                                 break;
3298                         nfs4_state_mark_reclaim_nograce(clp, state);
3299                 case -NFS4ERR_STALE_CLIENTID:
3300                 case -NFS4ERR_STALE_STATEID:
3301                 case -NFS4ERR_EXPIRED:
3302                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3303                         nfs4_schedule_state_recovery(clp);
3304                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3305                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3306                         task->tk_status = 0;
3307                         return -EAGAIN;
3308 #if defined(CONFIG_NFS_V4_1)
3309                 case -NFS4ERR_BADSESSION:
3310                 case -NFS4ERR_BADSLOT:
3311                 case -NFS4ERR_BAD_HIGH_SLOT:
3312                 case -NFS4ERR_DEADSESSION:
3313                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3314                 case -NFS4ERR_SEQ_FALSE_RETRY:
3315                 case -NFS4ERR_SEQ_MISORDERED:
3316                         dprintk("%s ERROR %d, Reset session\n", __func__,
3317                                 task->tk_status);
3318                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
3319                         task->tk_status = 0;
3320                         return -EAGAIN;
3321 #endif /* CONFIG_NFS_V4_1 */
3322                 case -NFS4ERR_DELAY:
3323                         if (server)
3324                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3325                 case -NFS4ERR_GRACE:
3326                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3327                         task->tk_status = 0;
3328                         return -EAGAIN;
3329                 case -NFS4ERR_OLD_STATEID:
3330                         task->tk_status = 0;
3331                         return -EAGAIN;
3332         }
3333         task->tk_status = nfs4_map_errors(task->tk_status);
3334         return 0;
3335 }
3336
3337 static int
3338 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3339 {
3340         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3341 }
3342
3343 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3344 {
3345         nfs4_verifier sc_verifier;
3346         struct nfs4_setclientid setclientid = {
3347                 .sc_verifier = &sc_verifier,
3348                 .sc_prog = program,
3349         };
3350         struct rpc_message msg = {
3351                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3352                 .rpc_argp = &setclientid,
3353                 .rpc_resp = clp,
3354                 .rpc_cred = cred,
3355         };
3356         __be32 *p;
3357         int loop = 0;
3358         int status;
3359
3360         p = (__be32*)sc_verifier.data;
3361         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3362         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3363
3364         for(;;) {
3365                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3366                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3367                                 clp->cl_ipaddr,
3368                                 rpc_peeraddr2str(clp->cl_rpcclient,
3369                                                         RPC_DISPLAY_ADDR),
3370                                 rpc_peeraddr2str(clp->cl_rpcclient,
3371                                                         RPC_DISPLAY_PROTO),
3372                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3373                                 clp->cl_id_uniquifier);
3374                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3375                                 sizeof(setclientid.sc_netid),
3376                                 rpc_peeraddr2str(clp->cl_rpcclient,
3377                                                         RPC_DISPLAY_NETID));
3378                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3379                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3380                                 clp->cl_ipaddr, port >> 8, port & 255);
3381
3382                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3383                 if (status != -NFS4ERR_CLID_INUSE)
3384                         break;
3385                 if (signalled())
3386                         break;
3387                 if (loop++ & 1)
3388                         ssleep(clp->cl_lease_time + 1);
3389                 else
3390                         if (++clp->cl_id_uniquifier == 0)
3391                                 break;
3392         }
3393         return status;
3394 }
3395
3396 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3397 {
3398         struct nfs_fsinfo fsinfo;
3399         struct rpc_message msg = {
3400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3401                 .rpc_argp = clp,
3402                 .rpc_resp = &fsinfo,
3403                 .rpc_cred = cred,
3404         };
3405         unsigned long now;
3406         int status;
3407
3408         now = jiffies;
3409         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3410         if (status == 0) {
3411                 spin_lock(&clp->cl_lock);
3412                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3413                 clp->cl_last_renewal = now;
3414                 spin_unlock(&clp->cl_lock);
3415         }
3416         return status;
3417 }
3418
3419 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3420 {
3421         long timeout = 0;
3422         int err;
3423         do {
3424                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3425                 switch (err) {
3426                         case 0:
3427                                 return err;
3428                         case -NFS4ERR_RESOURCE:
3429                                 /* The IBM lawyers misread another document! */
3430                         case -NFS4ERR_DELAY:
3431                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3432                 }
3433         } while (err == 0);
3434         return err;
3435 }
3436
3437 struct nfs4_delegreturndata {
3438         struct nfs4_delegreturnargs args;
3439         struct nfs4_delegreturnres res;
3440         struct nfs_fh fh;
3441         nfs4_stateid stateid;
3442         unsigned long timestamp;
3443         struct nfs_fattr fattr;
3444         int rpc_status;
3445 };
3446
3447 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3448 {
3449         struct nfs4_delegreturndata *data = calldata;
3450
3451         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3452                                      task->tk_status);
3453
3454         data->rpc_status = task->tk_status;
3455         if (data->rpc_status == 0)
3456                 renew_lease(data->res.server, data->timestamp);
3457 }
3458
3459 static void nfs4_delegreturn_release(void *calldata)
3460 {
3461         kfree(calldata);
3462 }
3463
3464 #if defined(CONFIG_NFS_V4_1)
3465 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3466 {
3467         struct nfs4_delegreturndata *d_data;
3468
3469         d_data = (struct nfs4_delegreturndata *)data;
3470
3471         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3472                                 &d_data->args.seq_args,
3473                                 &d_data->res.seq_res, 1, task))
3474                 return;
3475         rpc_call_start(task);
3476 }
3477 #endif /* CONFIG_NFS_V4_1 */
3478
3479 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3480 #if defined(CONFIG_NFS_V4_1)
3481         .rpc_call_prepare = nfs4_delegreturn_prepare,
3482 #endif /* CONFIG_NFS_V4_1 */
3483         .rpc_call_done = nfs4_delegreturn_done,
3484         .rpc_release = nfs4_delegreturn_release,
3485 };
3486
3487 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3488 {
3489         struct nfs4_delegreturndata *data;
3490         struct nfs_server *server = NFS_SERVER(inode);
3491         struct rpc_task *task;
3492         struct rpc_message msg = {
3493                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3494                 .rpc_cred = cred,
3495         };
3496         struct rpc_task_setup task_setup_data = {
3497                 .rpc_client = server->client,
3498                 .rpc_message = &msg,
3499                 .callback_ops = &nfs4_delegreturn_ops,
3500                 .flags = RPC_TASK_ASYNC,
3501         };
3502         int status = 0;
3503
3504         data = kzalloc(sizeof(*data), GFP_KERNEL);
3505         if (data == NULL)
3506                 return -ENOMEM;
3507         data->args.fhandle = &data->fh;
3508         data->args.stateid = &data->stateid;
3509         data->args.bitmask = server->attr_bitmask;
3510         nfs_copy_fh(&data->fh, NFS_FH(inode));
3511         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3512         data->res.fattr = &data->fattr;
3513         data->res.server = server;
3514         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3515         nfs_fattr_init(data->res.fattr);
3516         data->timestamp = jiffies;
3517         data->rpc_status = 0;
3518
3519         task_setup_data.callback_data = data;
3520         msg.rpc_argp = &data->args,
3521         msg.rpc_resp = &data->res,
3522         task = rpc_run_task(&task_setup_data);
3523         if (IS_ERR(task))
3524                 return PTR_ERR(task);
3525         if (!issync)
3526                 goto out;
3527         status = nfs4_wait_for_completion_rpc_task(task);
3528         if (status != 0)
3529                 goto out;
3530         status = data->rpc_status;
3531         if (status != 0)
3532                 goto out;
3533         nfs_refresh_inode(inode, &data->fattr);
3534 out:
3535         rpc_put_task(task);
3536         return status;
3537 }
3538
3539 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3540 {
3541         struct nfs_server *server = NFS_SERVER(inode);
3542         struct nfs4_exception exception = { };
3543         int err;
3544         do {
3545                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3546                 switch (err) {
3547                         case -NFS4ERR_STALE_STATEID:
3548                         case -NFS4ERR_EXPIRED:
3549                         case 0:
3550                                 return 0;
3551                 }
3552                 err = nfs4_handle_exception(server, err, &exception);
3553         } while (exception.retry);
3554         return err;
3555 }
3556
3557 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3558 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3559
3560 /*
3561  * sleep, with exponential backoff, and retry the LOCK operation.
3562  */
3563 static unsigned long
3564 nfs4_set_lock_task_retry(unsigned long timeout)
3565 {
3566         schedule_timeout_killable(timeout);
3567         timeout <<= 1;
3568         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3569                 return NFS4_LOCK_MAXTIMEOUT;
3570         return timeout;
3571 }
3572
3573 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3574 {
3575         struct inode *inode = state->inode;
3576         struct nfs_server *server = NFS_SERVER(inode);
3577         struct nfs_client *clp = server->nfs_client;
3578         struct nfs_lockt_args arg = {
3579                 .fh = NFS_FH(inode),
3580                 .fl = request,
3581         };
3582         struct nfs_lockt_res res = {
3583                 .denied = request,
3584         };
3585         struct rpc_message msg = {
3586                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3587                 .rpc_argp       = &arg,
3588                 .rpc_resp       = &res,
3589                 .rpc_cred       = state->owner->so_cred,
3590         };
3591         struct nfs4_lock_state *lsp;
3592         int status;
3593
3594         arg.lock_owner.clientid = clp->cl_clientid;
3595         status = nfs4_set_lock_state(state, request);
3596         if (status != 0)
3597                 goto out;
3598         lsp = request->fl_u.nfs4_fl.owner;
3599         arg.lock_owner.id = lsp->ls_id.id;
3600         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3601         switch (status) {
3602                 case 0:
3603                         request->fl_type = F_UNLCK;
3604                         break;
3605                 case -NFS4ERR_DENIED:
3606                         status = 0;
3607         }
3608         request->fl_ops->fl_release_private(request);
3609 out:
3610         return status;
3611 }
3612
3613 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3614 {
3615         struct nfs4_exception exception = { };
3616         int err;
3617
3618         do {
3619                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3620                                 _nfs4_proc_getlk(state, cmd, request),
3621                                 &exception);
3622         } while (exception.retry);
3623         return err;
3624 }
3625
3626 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3627 {
3628         int res = 0;
3629         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3630                 case FL_POSIX:
3631                         res = posix_lock_file_wait(file, fl);
3632                         break;
3633                 case FL_FLOCK:
3634                         res = flock_lock_file_wait(file, fl);
3635                         break;
3636                 default:
3637                         BUG();
3638         }
3639         return res;
3640 }
3641
3642 struct nfs4_unlockdata {
3643         struct nfs_locku_args arg;
3644         struct nfs_locku_res res;
3645         struct nfs4_lock_state *lsp;
3646         struct nfs_open_context *ctx;
3647         struct file_lock fl;
3648         const struct nfs_server *server;
3649         unsigned long timestamp;
3650 };
3651
3652 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3653                 struct nfs_open_context *ctx,
3654                 struct nfs4_lock_state *lsp,
3655                 struct nfs_seqid *seqid)
3656 {
3657         struct nfs4_unlockdata *p;
3658         struct inode *inode = lsp->ls_state->inode;
3659
3660         p = kzalloc(sizeof(*p), GFP_KERNEL);
3661         if (p == NULL)
3662                 return NULL;
3663         p->arg.fh = NFS_FH(inode);
3664         p->arg.fl = &p->fl;
3665         p->arg.seqid = seqid;
3666         p->res.seqid = seqid;
3667         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3668         p->arg.stateid = &lsp->ls_stateid;
3669         p->lsp = lsp;
3670         atomic_inc(&lsp->ls_count);
3671         /* Ensure we don't close file until we're done freeing locks! */
3672         p->ctx = get_nfs_open_context(ctx);
3673         memcpy(&p->fl, fl, sizeof(p->fl));
3674         p->server = NFS_SERVER(inode);
3675         return p;
3676 }
3677
3678 static void nfs4_locku_release_calldata(void *data)
3679 {
3680         struct nfs4_unlockdata *calldata = data;
3681         nfs_free_seqid(calldata->arg.seqid);
3682         nfs4_put_lock_state(calldata->lsp);
3683         put_nfs_open_context(calldata->ctx);
3684         kfree(calldata);
3685 }
3686
3687 static void nfs4_locku_done(struct rpc_task *task, void *data)
3688 {
3689         struct nfs4_unlockdata *calldata = data;
3690
3691         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3692                            task->tk_status);
3693         if (RPC_ASSASSINATED(task))
3694                 return;
3695         switch (task->tk_status) {
3696                 case 0:
3697                         memcpy(calldata->lsp->ls_stateid.data,
3698                                         calldata->res.stateid.data,
3699                                         sizeof(calldata->lsp->ls_stateid.data));
3700                         renew_lease(calldata->server, calldata->timestamp);
3701                         break;
3702                 case -NFS4ERR_BAD_STATEID:
3703                 case -NFS4ERR_OLD_STATEID:
3704                 case -NFS4ERR_STALE_STATEID:
3705                 case -NFS4ERR_EXPIRED:
3706                         break;
3707                 default:
3708                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3709                                 nfs4_restart_rpc(task,
3710                                                 calldata->server->nfs_client);
3711         }
3712         nfs4_sequence_free_slot(calldata->server->nfs_client,
3713                                 &calldata->res.seq_res);
3714 }
3715
3716 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3717 {
3718         struct nfs4_unlockdata *calldata = data;
3719
3720         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3721                 return;
3722         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3723                 /* Note: exit _without_ running nfs4_locku_done */
3724                 task->tk_action = NULL;
3725                 return;
3726         }
3727         calldata->timestamp = jiffies;
3728         if (nfs4_setup_sequence(calldata->server->nfs_client,
3729                                 &calldata->arg.seq_args,
3730                                 &calldata->res.seq_res, 1, task))
3731                 return;
3732         rpc_call_start(task);
3733 }
3734
3735 static const struct rpc_call_ops nfs4_locku_ops = {
3736         .rpc_call_prepare = nfs4_locku_prepare,
3737         .rpc_call_done = nfs4_locku_done,
3738         .rpc_release = nfs4_locku_release_calldata,
3739 };
3740
3741 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3742                 struct nfs_open_context *ctx,
3743                 struct nfs4_lock_state *lsp,
3744                 struct nfs_seqid *seqid)
3745 {
3746         struct nfs4_unlockdata *data;
3747         struct rpc_message msg = {
3748                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3749                 .rpc_cred = ctx->cred,
3750         };
3751         struct rpc_task_setup task_setup_data = {
3752                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3753                 .rpc_message = &msg,
3754                 .callback_ops = &nfs4_locku_ops,
3755                 .workqueue = nfsiod_workqueue,
3756                 .flags = RPC_TASK_ASYNC,
3757         };
3758
3759         /* Ensure this is an unlock - when canceling a lock, the
3760          * canceled lock is passed in, and it won't be an unlock.
3761          */
3762         fl->fl_type = F_UNLCK;
3763
3764         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3765         if (data == NULL) {
3766                 nfs_free_seqid(seqid);
3767                 return ERR_PTR(-ENOMEM);
3768         }
3769
3770         msg.rpc_argp = &data->arg,
3771         msg.rpc_resp = &data->res,
3772         task_setup_data.callback_data = data;
3773         return rpc_run_task(&task_setup_data);
3774 }
3775
3776 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3777 {
3778         struct nfs_inode *nfsi = NFS_I(state->inode);
3779         struct nfs_seqid *seqid;
3780         struct nfs4_lock_state *lsp;
3781         struct rpc_task *task;
3782         int status = 0;
3783         unsigned char fl_flags = request->fl_flags;
3784
3785         status = nfs4_set_lock_state(state, request);
3786         /* Unlock _before_ we do the RPC call */
3787         request->fl_flags |= FL_EXISTS;
3788         down_read(&nfsi->rwsem);
3789         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3790                 up_read(&nfsi->rwsem);
3791                 goto out;
3792         }
3793         up_read(&nfsi->rwsem);
3794         if (status != 0)
3795                 goto out;
3796         /* Is this a delegated lock? */
3797         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3798                 goto out;
3799         lsp = request->fl_u.nfs4_fl.owner;
3800         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3801         status = -ENOMEM;
3802         if (seqid == NULL)
3803                 goto out;
3804         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3805         status = PTR_ERR(task);
3806         if (IS_ERR(task))
3807                 goto out;
3808         status = nfs4_wait_for_completion_rpc_task(task);
3809         rpc_put_task(task);
3810 out:
3811         request->fl_flags = fl_flags;
3812         return status;
3813 }
3814
3815 struct nfs4_lockdata {
3816         struct nfs_lock_args arg;
3817         struct nfs_lock_res res;
3818         struct nfs4_lock_state *lsp;
3819         struct nfs_open_context *ctx;
3820         struct file_lock fl;
3821         unsigned long timestamp;
3822         int rpc_status;
3823         int cancelled;
3824         struct nfs_server *server;
3825 };
3826
3827 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3828                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3829 {
3830         struct nfs4_lockdata *p;
3831         struct inode *inode = lsp->ls_state->inode;
3832         struct nfs_server *server = NFS_SERVER(inode);
3833
3834         p = kzalloc(sizeof(*p), GFP_KERNEL);
3835         if (p == NULL)
3836                 return NULL;
3837
3838         p->arg.fh = NFS_FH(inode);
3839         p->arg.fl = &p->fl;
3840         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3841         if (p->arg.open_seqid == NULL)
3842                 goto out_free;
3843         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3844         if (p->arg.lock_seqid == NULL)
3845                 goto out_free_seqid;
3846         p->arg.lock_stateid = &lsp->ls_stateid;
3847         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3848         p->arg.lock_owner.id = lsp->ls_id.id;
3849         p->res.lock_seqid = p->arg.lock_seqid;
3850         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3851         p->lsp = lsp;
3852         p->server = server;
3853         atomic_inc(&lsp->ls_count);
3854         p->ctx = get_nfs_open_context(ctx);
3855         memcpy(&p->fl, fl, sizeof(p->fl));
3856         return p;
3857 out_free_seqid:
3858         nfs_free_seqid(p->arg.open_seqid);
3859 out_free:
3860         kfree(p);
3861         return NULL;
3862 }
3863
3864 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3865 {
3866         struct nfs4_lockdata *data = calldata;
3867         struct nfs4_state *state = data->lsp->ls_state;
3868
3869         dprintk("%s: begin!\n", __func__);
3870         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3871                 return;
3872         /* Do we need to do an open_to_lock_owner? */
3873         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3874                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3875                         return;
3876                 data->arg.open_stateid = &state->stateid;
3877                 data->arg.new_lock_owner = 1;
3878                 data->res.open_seqid = data->arg.open_seqid;
3879         } else
3880                 data->arg.new_lock_owner = 0;
3881         data->timestamp = jiffies;
3882         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3883                                 &data->res.seq_res, 1, task))
3884                 return;
3885         rpc_call_start(task);
3886         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3887 }
3888
3889 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3890 {
3891         struct nfs4_lockdata *data = calldata;
3892
3893         dprintk("%s: begin!\n", __func__);
3894
3895         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3896                                      task->tk_status);
3897
3898         data->rpc_status = task->tk_status;
3899         if (RPC_ASSASSINATED(task))
3900                 goto out;
3901         if (data->arg.new_lock_owner != 0) {
3902                 if (data->rpc_status == 0)
3903                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3904                 else
3905                         goto out;
3906         }
3907         if (data->rpc_status == 0) {
3908                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3909                                         sizeof(data->lsp->ls_stateid.data));
3910                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3911                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3912         }
3913 out:
3914         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3915 }
3916
3917 static void nfs4_lock_release(void *calldata)
3918 {
3919         struct nfs4_lockdata *data = calldata;
3920
3921         dprintk("%s: begin!\n", __func__);
3922         nfs_free_seqid(data->arg.open_seqid);
3923         if (data->cancelled != 0) {
3924                 struct rpc_task *task;
3925                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3926                                 data->arg.lock_seqid);
3927                 if (!IS_ERR(task))
3928                         rpc_put_task(task);
3929                 dprintk("%s: cancelling lock!\n", __func__);
3930         } else
3931                 nfs_free_seqid(data->arg.lock_seqid);
3932         nfs4_put_lock_state(data->lsp);
3933         put_nfs_open_context(data->ctx);
3934         kfree(data);
3935         dprintk("%s: done!\n", __func__);
3936 }
3937
3938 static const struct rpc_call_ops nfs4_lock_ops = {
3939         .rpc_call_prepare = nfs4_lock_prepare,
3940         .rpc_call_done = nfs4_lock_done,
3941         .rpc_release = nfs4_lock_release,
3942 };
3943
3944 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3945 {
3946         struct nfs4_lockdata *data;
3947         struct rpc_task *task;
3948         struct rpc_message msg = {
3949                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3950                 .rpc_cred = state->owner->so_cred,
3951         };
3952         struct rpc_task_setup task_setup_data = {
3953                 .rpc_client = NFS_CLIENT(state->inode),
3954                 .rpc_message = &msg,
3955                 .callback_ops = &nfs4_lock_ops,
3956                 .workqueue = nfsiod_workqueue,
3957                 .flags = RPC_TASK_ASYNC,
3958         };
3959         int ret;
3960
3961         dprintk("%s: begin!\n", __func__);
3962         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3963                         fl->fl_u.nfs4_fl.owner);
3964         if (data == NULL)
3965                 return -ENOMEM;
3966         if (IS_SETLKW(cmd))
3967                 data->arg.block = 1;
3968         if (reclaim != 0)
3969                 data->arg.reclaim = 1;
3970         msg.rpc_argp = &data->arg,
3971         msg.rpc_resp = &data->res,
3972         task_setup_data.callback_data = data;
3973         task = rpc_run_task(&task_setup_data);
3974         if (IS_ERR(task))
3975                 return PTR_ERR(task);
3976         ret = nfs4_wait_for_completion_rpc_task(task);
3977         if (ret == 0) {
3978                 ret = data->rpc_status;
3979                 if (ret == -NFS4ERR_DENIED)
3980                         ret = -EAGAIN;
3981         } else
3982                 data->cancelled = 1;
3983         rpc_put_task(task);
3984         dprintk("%s: done, ret = %d!\n", __func__, ret);
3985         return ret;
3986 }
3987
3988 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3989 {
3990         struct nfs_server *server = NFS_SERVER(state->inode);
3991         struct nfs4_exception exception = { };
3992         int err;
3993
3994         do {
3995                 /* Cache the lock if possible... */
3996                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3997                         return 0;
3998                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3999                 if (err != -NFS4ERR_DELAY)
4000                         break;
4001                 nfs4_handle_exception(server, err, &exception);
4002         } while (exception.retry);
4003         return err;
4004 }
4005
4006 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4007 {
4008         struct nfs_server *server = NFS_SERVER(state->inode);
4009         struct nfs4_exception exception = { };
4010         int err;
4011
4012         err = nfs4_set_lock_state(state, request);
4013         if (err != 0)
4014                 return err;
4015         do {
4016                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4017                         return 0;
4018                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4019                 if (err != -NFS4ERR_DELAY)
4020                         break;
4021                 nfs4_handle_exception(server, err, &exception);
4022         } while (exception.retry);
4023         return err;
4024 }
4025
4026 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4027 {
4028         struct nfs_inode *nfsi = NFS_I(state->inode);
4029         unsigned char fl_flags = request->fl_flags;
4030         int status;
4031
4032         /* Is this a delegated open? */
4033         status = nfs4_set_lock_state(state, request);
4034         if (status != 0)
4035                 goto out;
4036         request->fl_flags |= FL_ACCESS;
4037         status = do_vfs_lock(request->fl_file, request);
4038         if (status < 0)
4039                 goto out;
4040         down_read(&nfsi->rwsem);
4041         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4042                 /* Yes: cache locks! */
4043                 /* ...but avoid races with delegation recall... */
4044                 request->fl_flags = fl_flags & ~FL_SLEEP;
4045                 status = do_vfs_lock(request->fl_file, request);
4046                 goto out_unlock;
4047         }
4048         status = _nfs4_do_setlk(state, cmd, request, 0);
4049         if (status != 0)
4050                 goto out_unlock;
4051         /* Note: we always want to sleep here! */
4052         request->fl_flags = fl_flags | FL_SLEEP;
4053         if (do_vfs_lock(request->fl_file, request) < 0)
4054                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4055 out_unlock:
4056         up_read(&nfsi->rwsem);
4057 out:
4058         request->fl_flags = fl_flags;
4059         return status;
4060 }
4061
4062 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4063 {
4064         struct nfs4_exception exception = { };
4065         int err;
4066
4067         do {
4068                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4069                                 _nfs4_proc_setlk(state, cmd, request),
4070                                 &exception);
4071         } while (exception.retry);
4072         return err;
4073 }
4074
4075 static int
4076 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4077 {
4078         struct nfs_open_context *ctx;
4079         struct nfs4_state *state;
4080         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4081         int status;
4082
4083         /* verify open state */
4084         ctx = nfs_file_open_context(filp);
4085         state = ctx->state;
4086
4087         if (request->fl_start < 0 || request->fl_end < 0)
4088                 return -EINVAL;
4089
4090         if (IS_GETLK(cmd))
4091                 return nfs4_proc_getlk(state, F_GETLK, request);
4092
4093         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4094                 return -EINVAL;
4095
4096         if (request->fl_type == F_UNLCK)
4097                 return nfs4_proc_unlck(state, cmd, request);
4098
4099         do {
4100                 status = nfs4_proc_setlk(state, cmd, request);
4101                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4102                         break;
4103                 timeout = nfs4_set_lock_task_retry(timeout);
4104                 status = -ERESTARTSYS;
4105                 if (signalled())
4106                         break;
4107         } while(status < 0);
4108         return status;
4109 }
4110
4111 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4112 {
4113         struct nfs_server *server = NFS_SERVER(state->inode);
4114         struct nfs4_exception exception = { };
4115         int err;
4116
4117         err = nfs4_set_lock_state(state, fl);
4118         if (err != 0)
4119                 goto out;
4120         do {
4121                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4122                 if (err != -NFS4ERR_DELAY)
4123                         break;
4124                 err = nfs4_handle_exception(server, err, &exception);
4125         } while (exception.retry);
4126 out:
4127         return err;
4128 }
4129
4130 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4131
4132 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4133                 size_t buflen, int flags)
4134 {
4135         struct inode *inode = dentry->d_inode;
4136
4137         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4138                 return -EOPNOTSUPP;
4139
4140         return nfs4_proc_set_acl(inode, buf, buflen);
4141 }
4142
4143 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4144  * and that's what we'll do for e.g. user attributes that haven't been set.
4145  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4146  * attributes in kernel-managed attribute namespaces. */
4147 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4148                 size_t buflen)
4149 {
4150         struct inode *inode = dentry->d_inode;
4151
4152         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4153                 return -EOPNOTSUPP;
4154
4155         return nfs4_proc_get_acl(inode, buf, buflen);
4156 }
4157
4158 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4159 {
4160         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4161
4162         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4163                 return 0;
4164         if (buf && buflen < len)
4165                 return -ERANGE;
4166         if (buf)
4167                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4168         return len;
4169 }
4170
4171 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4172 {
4173         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4174                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4175                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4176                 return;
4177
4178         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4179                 NFS_ATTR_FATTR_NLINK;
4180         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4181         fattr->nlink = 2;
4182 }
4183
4184 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4185                 struct nfs4_fs_locations *fs_locations, struct page *page)
4186 {
4187         struct nfs_server *server = NFS_SERVER(dir);
4188         u32 bitmask[2] = {
4189                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4190                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4191         };
4192         struct nfs4_fs_locations_arg args = {
4193                 .dir_fh = NFS_FH(dir),
4194                 .name = name,
4195                 .page = page,
4196                 .bitmask = bitmask,
4197         };
4198         struct nfs4_fs_locations_res res = {
4199                 .fs_locations = fs_locations,
4200         };
4201         struct rpc_message msg = {
4202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4203                 .rpc_argp = &args,
4204                 .rpc_resp = &res,
4205         };
4206         int status;
4207
4208         dprintk("%s: start\n", __func__);
4209         nfs_fattr_init(&fs_locations->fattr);
4210         fs_locations->server = server;
4211         fs_locations->nlocations = 0;
4212         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4213         nfs_fixup_referral_attributes(&fs_locations->fattr);
4214         dprintk("%s: returned status = %d\n", __func__, status);
4215         return status;
4216 }
4217
4218 #ifdef CONFIG_NFS_V4_1
4219 /*
4220  * nfs4_proc_exchange_id()
4221  *
4222  * Since the clientid has expired, all compounds using sessions
4223  * associated with the stale clientid will be returning
4224  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4225  * be in some phase of session reset.
4226  */
4227 static int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4228 {
4229         nfs4_verifier verifier;
4230         struct nfs41_exchange_id_args args = {
4231                 .client = clp,
4232                 .flags = clp->cl_exchange_flags,
4233         };
4234         struct nfs41_exchange_id_res res = {
4235                 .client = clp,
4236         };
4237         int status;
4238         struct rpc_message msg = {
4239                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4240                 .rpc_argp = &args,
4241                 .rpc_resp = &res,
4242                 .rpc_cred = cred,
4243         };
4244         __be32 *p;
4245
4246         dprintk("--> %s\n", __func__);
4247         BUG_ON(clp == NULL);
4248
4249         p = (u32 *)verifier.data;
4250         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4251         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4252         args.verifier = &verifier;
4253
4254         while (1) {
4255                 args.id_len = scnprintf(args.id, sizeof(args.id),
4256                                         "%s/%s %u",
4257                                         clp->cl_ipaddr,
4258                                         rpc_peeraddr2str(clp->cl_rpcclient,
4259                                                          RPC_DISPLAY_ADDR),
4260                                         clp->cl_id_uniquifier);
4261
4262                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4263
4264                 if (status != NFS4ERR_CLID_INUSE)
4265                         break;
4266
4267                 if (signalled())
4268                         break;
4269
4270                 if (++clp->cl_id_uniquifier == 0)
4271                         break;
4272         }
4273
4274         dprintk("<-- %s status= %d\n", __func__, status);
4275         return status;
4276 }
4277
4278 struct nfs4_get_lease_time_data {
4279         struct nfs4_get_lease_time_args *args;
4280         struct nfs4_get_lease_time_res *res;
4281         struct nfs_client *clp;
4282 };
4283
4284 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4285                                         void *calldata)
4286 {
4287         int ret;
4288         struct nfs4_get_lease_time_data *data =
4289                         (struct nfs4_get_lease_time_data *)calldata;
4290
4291         dprintk("--> %s\n", __func__);
4292         /* just setup sequence, do not trigger session recovery
4293            since we're invoked within one */
4294         ret = nfs41_setup_sequence(data->clp->cl_session,
4295                                         &data->args->la_seq_args,
4296                                         &data->res->lr_seq_res, 0, task);
4297
4298         BUG_ON(ret == -EAGAIN);
4299         rpc_call_start(task);
4300         dprintk("<-- %s\n", __func__);
4301 }
4302
4303 /*
4304  * Called from nfs4_state_manager thread for session setup, so don't recover
4305  * from sequence operation or clientid errors.
4306  */
4307 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4308 {
4309         struct nfs4_get_lease_time_data *data =
4310                         (struct nfs4_get_lease_time_data *)calldata;
4311
4312         dprintk("--> %s\n", __func__);
4313         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4314         switch (task->tk_status) {
4315         case -NFS4ERR_DELAY:
4316         case -NFS4ERR_GRACE:
4317                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4318                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4319                 task->tk_status = 0;
4320                 nfs4_restart_rpc(task, data->clp);
4321                 return;
4322         }
4323         nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
4324         dprintk("<-- %s\n", __func__);
4325 }
4326
4327 struct rpc_call_ops nfs4_get_lease_time_ops = {
4328         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4329         .rpc_call_done = nfs4_get_lease_time_done,
4330 };
4331
4332 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4333 {
4334         struct rpc_task *task;
4335         struct nfs4_get_lease_time_args args;
4336         struct nfs4_get_lease_time_res res = {
4337                 .lr_fsinfo = fsinfo,
4338         };
4339         struct nfs4_get_lease_time_data data = {
4340                 .args = &args,
4341                 .res = &res,
4342                 .clp = clp,
4343         };
4344         struct rpc_message msg = {
4345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4346                 .rpc_argp = &args,
4347                 .rpc_resp = &res,
4348         };
4349         struct rpc_task_setup task_setup = {
4350                 .rpc_client = clp->cl_rpcclient,
4351                 .rpc_message = &msg,
4352                 .callback_ops = &nfs4_get_lease_time_ops,
4353                 .callback_data = &data
4354         };
4355         int status;
4356
4357         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4358         dprintk("--> %s\n", __func__);
4359         task = rpc_run_task(&task_setup);
4360
4361         if (IS_ERR(task))
4362                 status = PTR_ERR(task);
4363         else {
4364                 status = task->tk_status;
4365                 rpc_put_task(task);
4366         }
4367         dprintk("<-- %s return %d\n", __func__, status);
4368
4369         return status;
4370 }
4371
4372 /* Reset a slot table */
4373 static int nfs4_reset_slot_table(struct nfs4_session *session)
4374 {
4375         struct nfs4_slot_table *tbl = &session->fc_slot_table;
4376         int i, max_slots = session->fc_attrs.max_reqs;
4377         int old_max_slots = session->fc_slot_table.max_slots;
4378         int ret = 0;
4379
4380         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__,
4381                 session->fc_attrs.max_reqs, tbl);
4382
4383         /* Until we have dynamic slot table adjustment, insist
4384          * upon the same slot table size */
4385         if (max_slots != old_max_slots) {
4386                 dprintk("%s reset slot table does't match old\n",
4387                         __func__);
4388                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4389                 goto out;
4390         }
4391         spin_lock(&tbl->slot_tbl_lock);
4392         for (i = 0; i < max_slots; ++i)
4393                 tbl->slots[i].seq_nr = 1;
4394         tbl->highest_used_slotid = -1;
4395         spin_unlock(&tbl->slot_tbl_lock);
4396         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4397                 tbl, tbl->slots, tbl->max_slots);
4398 out:
4399         dprintk("<-- %s: return %d\n", __func__, ret);
4400         return ret;
4401 }
4402
4403 /*
4404  * Initialize slot table
4405  */
4406 static int nfs4_init_slot_table(struct nfs4_session *session)
4407 {
4408         struct nfs4_slot_table *tbl = &session->fc_slot_table;
4409         int i, max_slots = session->fc_attrs.max_reqs;
4410         struct nfs4_slot *slot;
4411         int ret = -ENOMEM;
4412
4413         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4414
4415         dprintk("--> %s: max_reqs=%u\n", __func__,
4416                 session->fc_attrs.max_reqs);
4417
4418         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4419         if (!slot)
4420                 goto out;
4421         for (i = 0; i < max_slots; ++i)
4422                 slot[i].seq_nr = 1;
4423         ret = 0;
4424
4425         spin_lock(&tbl->slot_tbl_lock);
4426         if (tbl->slots != NULL) {
4427                 spin_unlock(&tbl->slot_tbl_lock);
4428                 dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
4429                         __func__, tbl, tbl->slots);
4430                 WARN_ON(1);
4431                 goto out_free;
4432         }
4433         tbl->max_slots = max_slots;
4434         tbl->slots = slot;
4435         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4436         spin_unlock(&tbl->slot_tbl_lock);
4437         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4438                 tbl, tbl->slots, tbl->max_slots);
4439 out:
4440         dprintk("<-- %s: return %d\n", __func__, ret);
4441         return ret;
4442 out_free:
4443         kfree(slot);
4444         goto out;
4445 }
4446
4447 /* Destroy the slot table */
4448 static void nfs4_destroy_slot_table(struct nfs4_session *session)
4449 {
4450         if (session->fc_slot_table.slots == NULL)
4451                 return;
4452         kfree(session->fc_slot_table.slots);
4453         session->fc_slot_table.slots = NULL;
4454         return;
4455 }
4456
4457 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4458 {
4459         struct nfs4_session *session;
4460         struct nfs4_slot_table *tbl;
4461
4462         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4463         if (!session)
4464                 return NULL;
4465
4466         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
4467         /*
4468          * The create session reply races with the server back
4469          * channel probe. Mark the client NFS_CS_SESSION_INITING
4470          * so that the client back channel can find the
4471          * nfs_client struct
4472          */
4473         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4474
4475         tbl = &session->fc_slot_table;
4476         spin_lock_init(&tbl->slot_tbl_lock);
4477         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "Slot table");
4478         session->clp = clp;
4479         return session;
4480 }
4481
4482 void nfs4_destroy_session(struct nfs4_session *session)
4483 {
4484         nfs4_destroy_slot_table(session);
4485         kfree(session);
4486 }
4487
4488 /*
4489  * Initialize the values to be used by the client in CREATE_SESSION
4490  * If nfs4_init_session set the fore channel request and response sizes,
4491  * use them.
4492  *
4493  * Set the back channel max_resp_sz_cached to zero to force the client to
4494  * always set csa_cachethis to FALSE because the current implementation
4495  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4496  */
4497 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4498 {
4499         struct nfs4_session *session = args->client->cl_session;
4500         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4501                      mxresp_sz = session->fc_attrs.max_resp_sz;
4502
4503         if (mxrqst_sz == 0)
4504                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4505         if (mxresp_sz == 0)
4506                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4507         /* Fore channel attributes */
4508         args->fc_attrs.headerpadsz = 0;
4509         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4510         args->fc_attrs.max_resp_sz = mxresp_sz;
4511         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4512         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4513         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4514
4515         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4516                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4517                 __func__,
4518                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4519                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4520                 args->fc_attrs.max_reqs);
4521
4522         /* Back channel attributes */
4523         args->bc_attrs.headerpadsz = 0;
4524         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4525         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4526         args->bc_attrs.max_resp_sz_cached = 0;
4527         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4528         args->bc_attrs.max_reqs = 1;
4529
4530         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4531                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4532                 __func__,
4533                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4534                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4535                 args->bc_attrs.max_reqs);
4536 }
4537
4538 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4539 {
4540         if (rcvd <= sent)
4541                 return 0;
4542         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4543                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4544         return -EINVAL;
4545 }
4546
4547 #define _verify_fore_channel_attr(_name_) \
4548         _verify_channel_attr("fore", #_name_, \
4549                              args->fc_attrs._name_, \
4550                              session->fc_attrs._name_)
4551
4552 #define _verify_back_channel_attr(_name_) \
4553         _verify_channel_attr("back", #_name_, \
4554                              args->bc_attrs._name_, \
4555                              session->bc_attrs._name_)
4556
4557 /*
4558  * The server is not allowed to increase the fore channel header pad size,
4559  * maximum response size, or maximum number of operations.
4560  *
4561  * The back channel attributes are only negotiatied down: We send what the
4562  * (back channel) server insists upon.
4563  */
4564 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4565                                      struct nfs4_session *session)
4566 {
4567         int ret = 0;
4568
4569         ret |= _verify_fore_channel_attr(headerpadsz);
4570         ret |= _verify_fore_channel_attr(max_resp_sz);
4571         ret |= _verify_fore_channel_attr(max_ops);
4572
4573         ret |= _verify_back_channel_attr(headerpadsz);
4574         ret |= _verify_back_channel_attr(max_rqst_sz);
4575         ret |= _verify_back_channel_attr(max_resp_sz);
4576         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4577         ret |= _verify_back_channel_attr(max_ops);
4578         ret |= _verify_back_channel_attr(max_reqs);
4579
4580         return ret;
4581 }
4582
4583 static int _nfs4_proc_create_session(struct nfs_client *clp)
4584 {
4585         struct nfs4_session *session = clp->cl_session;
4586         struct nfs41_create_session_args args = {
4587                 .client = clp,
4588                 .cb_program = NFS4_CALLBACK,
4589         };
4590         struct nfs41_create_session_res res = {
4591                 .client = clp,
4592         };
4593         struct rpc_message msg = {
4594                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4595                 .rpc_argp = &args,
4596                 .rpc_resp = &res,
4597         };
4598         int status;
4599
4600         nfs4_init_channel_attrs(&args);
4601         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4602
4603         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4604
4605         if (!status)
4606                 /* Verify the session's negotiated channel_attrs values */
4607                 status = nfs4_verify_channel_attrs(&args, session);
4608         if (!status) {
4609                 /* Increment the clientid slot sequence id */
4610                 clp->cl_seqid++;
4611         }
4612
4613         return status;
4614 }
4615
4616 /*
4617  * Issues a CREATE_SESSION operation to the server.
4618  * It is the responsibility of the caller to verify the session is
4619  * expired before calling this routine.
4620  */
4621 int nfs4_proc_create_session(struct nfs_client *clp, int reset)
4622 {
4623         int status;
4624         unsigned *ptr;
4625         struct nfs_fsinfo fsinfo;
4626         struct nfs4_session *session = clp->cl_session;
4627
4628         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4629
4630         status = _nfs4_proc_create_session(clp);
4631         if (status)
4632                 goto out;
4633
4634         /* Init or reset the fore channel */
4635         if (reset)
4636                 status = nfs4_reset_slot_table(session);
4637         else
4638                 status = nfs4_init_slot_table(session);
4639         dprintk("fore channel slot table initialization returned %d\n", status);
4640         if (status)
4641                 goto out;
4642
4643         ptr = (unsigned *)&session->sess_id.data[0];
4644         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4645                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4646
4647         if (reset)
4648                 /* Lease time is aleady set */
4649                 goto out;
4650
4651         /* Get the lease time */
4652         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4653         if (status == 0) {
4654                 /* Update lease time and schedule renewal */
4655                 spin_lock(&clp->cl_lock);
4656                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4657                 clp->cl_last_renewal = jiffies;
4658                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
4659                 spin_unlock(&clp->cl_lock);
4660
4661                 nfs4_schedule_state_renewal(clp);
4662         }
4663 out:
4664         dprintk("<-- %s\n", __func__);
4665         return status;
4666 }
4667
4668 /*
4669  * Issue the over-the-wire RPC DESTROY_SESSION.
4670  * The caller must serialize access to this routine.
4671  */
4672 int nfs4_proc_destroy_session(struct nfs4_session *session)
4673 {
4674         int status = 0;
4675         struct rpc_message msg;
4676
4677         dprintk("--> nfs4_proc_destroy_session\n");
4678
4679         /* session is still being setup */
4680         if (session->clp->cl_cons_state != NFS_CS_READY)
4681                 return status;
4682
4683         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4684         msg.rpc_argp = session;
4685         msg.rpc_resp = NULL;
4686         msg.rpc_cred = NULL;
4687         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4688
4689         if (status)
4690                 printk(KERN_WARNING
4691                         "Got error %d from the server on DESTROY_SESSION. "
4692                         "Session has been destroyed regardless...\n", status);
4693
4694         dprintk("<-- nfs4_proc_destroy_session\n");
4695         return status;
4696 }
4697
4698 /*
4699  * Renew the cl_session lease.
4700  */
4701 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4702 {
4703         struct nfs4_sequence_args args;
4704         struct nfs4_sequence_res res;
4705
4706         struct rpc_message msg = {
4707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4708                 .rpc_argp = &args,
4709                 .rpc_resp = &res,
4710                 .rpc_cred = cred,
4711         };
4712
4713         args.sa_cache_this = 0;
4714
4715         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4716                                        &res, 0);
4717 }
4718
4719 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4720 {
4721         struct nfs_client *clp = (struct nfs_client *)data;
4722
4723         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4724
4725         if (task->tk_status < 0) {
4726                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4727
4728                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4729                                                                 == -EAGAIN) {
4730                         nfs4_restart_rpc(task, clp);
4731                         return;
4732                 }
4733         }
4734         nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
4735         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4736
4737         put_rpccred(task->tk_msg.rpc_cred);
4738         kfree(task->tk_msg.rpc_argp);
4739         kfree(task->tk_msg.rpc_resp);
4740
4741         dprintk("<-- %s\n", __func__);
4742 }
4743
4744 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4745 {
4746         struct nfs_client *clp;
4747         struct nfs4_sequence_args *args;
4748         struct nfs4_sequence_res *res;
4749
4750         clp = (struct nfs_client *)data;
4751         args = task->tk_msg.rpc_argp;
4752         res = task->tk_msg.rpc_resp;
4753
4754         if (nfs4_setup_sequence(clp, args, res, 0, task))
4755                 return;
4756         rpc_call_start(task);
4757 }
4758
4759 static const struct rpc_call_ops nfs41_sequence_ops = {
4760         .rpc_call_done = nfs41_sequence_call_done,
4761         .rpc_call_prepare = nfs41_sequence_prepare,
4762 };
4763
4764 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4765                                      struct rpc_cred *cred)
4766 {
4767         struct nfs4_sequence_args *args;
4768         struct nfs4_sequence_res *res;
4769         struct rpc_message msg = {
4770                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4771                 .rpc_cred = cred,
4772         };
4773
4774         args = kzalloc(sizeof(*args), GFP_KERNEL);
4775         if (!args)
4776                 return -ENOMEM;
4777         res = kzalloc(sizeof(*res), GFP_KERNEL);
4778         if (!res) {
4779                 kfree(args);
4780                 return -ENOMEM;
4781         }
4782         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4783         msg.rpc_argp = args;
4784         msg.rpc_resp = res;
4785
4786         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4787                               &nfs41_sequence_ops, (void *)clp);
4788 }
4789
4790 #endif /* CONFIG_NFS_V4_1 */
4791
4792 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
4793         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4794         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4795         .recover_open   = nfs4_open_reclaim,
4796         .recover_lock   = nfs4_lock_reclaim,
4797         .establish_clid = nfs4_init_clientid,
4798         .get_clid_cred  = nfs4_get_setclientid_cred,
4799 };
4800
4801 #if defined(CONFIG_NFS_V4_1)
4802 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
4803         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4804         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4805         .recover_open   = nfs4_open_reclaim,
4806         .recover_lock   = nfs4_lock_reclaim,
4807         .establish_clid = nfs4_proc_exchange_id,
4808         .get_clid_cred  = nfs4_get_exchange_id_cred,
4809 };
4810 #endif /* CONFIG_NFS_V4_1 */
4811
4812 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
4813         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4814         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4815         .recover_open   = nfs4_open_expired,
4816         .recover_lock   = nfs4_lock_expired,
4817         .establish_clid = nfs4_init_clientid,
4818         .get_clid_cred  = nfs4_get_setclientid_cred,
4819 };
4820
4821 #if defined(CONFIG_NFS_V4_1)
4822 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
4823         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4824         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4825         .recover_open   = nfs4_open_expired,
4826         .recover_lock   = nfs4_lock_expired,
4827         .establish_clid = nfs4_proc_exchange_id,
4828         .get_clid_cred  = nfs4_get_exchange_id_cred,
4829 };
4830 #endif /* CONFIG_NFS_V4_1 */
4831
4832 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
4833         .sched_state_renewal = nfs4_proc_async_renew,
4834         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
4835         .renew_lease = nfs4_proc_renew,
4836 };
4837
4838 #if defined(CONFIG_NFS_V4_1)
4839 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
4840         .sched_state_renewal = nfs41_proc_async_sequence,
4841         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
4842         .renew_lease = nfs4_proc_sequence,
4843 };
4844 #endif
4845
4846 /*
4847  * Per minor version reboot and network partition recovery ops
4848  */
4849
4850 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
4851         &nfs40_reboot_recovery_ops,
4852 #if defined(CONFIG_NFS_V4_1)
4853         &nfs41_reboot_recovery_ops,
4854 #endif
4855 };
4856
4857 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
4858         &nfs40_nograce_recovery_ops,
4859 #if defined(CONFIG_NFS_V4_1)
4860         &nfs41_nograce_recovery_ops,
4861 #endif
4862 };
4863
4864 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
4865         &nfs40_state_renewal_ops,
4866 #if defined(CONFIG_NFS_V4_1)
4867         &nfs41_state_renewal_ops,
4868 #endif
4869 };
4870
4871 static const struct inode_operations nfs4_file_inode_operations = {
4872         .permission     = nfs_permission,
4873         .getattr        = nfs_getattr,
4874         .setattr        = nfs_setattr,
4875         .getxattr       = nfs4_getxattr,
4876         .setxattr       = nfs4_setxattr,
4877         .listxattr      = nfs4_listxattr,
4878 };
4879
4880 const struct nfs_rpc_ops nfs_v4_clientops = {
4881         .version        = 4,                    /* protocol version */
4882         .dentry_ops     = &nfs4_dentry_operations,
4883         .dir_inode_ops  = &nfs4_dir_inode_operations,
4884         .file_inode_ops = &nfs4_file_inode_operations,
4885         .getroot        = nfs4_proc_get_root,
4886         .getattr        = nfs4_proc_getattr,
4887         .setattr        = nfs4_proc_setattr,
4888         .lookupfh       = nfs4_proc_lookupfh,
4889         .lookup         = nfs4_proc_lookup,
4890         .access         = nfs4_proc_access,
4891         .readlink       = nfs4_proc_readlink,
4892         .create         = nfs4_proc_create,
4893         .remove         = nfs4_proc_remove,
4894         .unlink_setup   = nfs4_proc_unlink_setup,
4895         .unlink_done    = nfs4_proc_unlink_done,
4896         .rename         = nfs4_proc_rename,
4897         .link           = nfs4_proc_link,
4898         .symlink        = nfs4_proc_symlink,
4899         .mkdir          = nfs4_proc_mkdir,
4900         .rmdir          = nfs4_proc_remove,
4901         .readdir        = nfs4_proc_readdir,
4902         .mknod          = nfs4_proc_mknod,
4903         .statfs         = nfs4_proc_statfs,
4904         .fsinfo         = nfs4_proc_fsinfo,
4905         .pathconf       = nfs4_proc_pathconf,
4906         .set_capabilities = nfs4_server_capabilities,
4907         .decode_dirent  = nfs4_decode_dirent,
4908         .read_setup     = nfs4_proc_read_setup,
4909         .read_done      = nfs4_read_done,
4910         .write_setup    = nfs4_proc_write_setup,
4911         .write_done     = nfs4_write_done,
4912         .commit_setup   = nfs4_proc_commit_setup,
4913         .commit_done    = nfs4_commit_done,
4914         .lock           = nfs4_proc_lock,
4915         .clear_acl_cache = nfs4_zap_acl_attr,
4916         .close_context  = nfs4_close_context,
4917 };
4918
4919 /*
4920  * Local variables:
4921  *  c-basic-offset: 8
4922  * End:
4923  */