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/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 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         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 683 }
 684
 685 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 686                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 687                 const struct iattr *attrs)
 688 {
 689         struct dentry *parent = dget_parent(path->dentry);
 690         struct inode *dir = parent->d_inode;
 691         struct nfs_server *server = NFS_SERVER(dir);
 692         struct nfs4_opendata *p;
 693
 694         p = kzalloc(sizeof(*p), GFP_KERNEL);
 695         if (p == NULL)
 696                 goto err;
 697         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 698         if (p->o_arg.seqid == NULL)
 699                 goto err_free;
 700         p->path.mnt = mntget(path->mnt);
 701         p->path.dentry = dget(path->dentry);
 702         p->dir = parent;
 703         p->owner = sp;
 704         atomic_inc(&sp->so_count);
 705         p->o_arg.fh = NFS_FH(dir);
 706         p->o_arg.open_flags = flags;
 707         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 708         p->o_arg.clientid = server->nfs_client->cl_clientid;
 709         p->o_arg.id = sp->so_owner_id.id;
 710         p->o_arg.name = &p->path.dentry->d_name;
 711         p->o_arg.server = server;
 712         p->o_arg.bitmask = server->attr_bitmask;
 713         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 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                         case -ENOENT:
1176                         case -ESTALE:
1177                                 goto out;
1178                         case -NFS4ERR_STALE_CLIENTID:
1179                         case -NFS4ERR_STALE_STATEID:
1180                         case -NFS4ERR_EXPIRED:
1181                                 /* Don't recall a delegation if it was lost */
1182                                 nfs4_schedule_state_recovery(server->nfs_client);
1183                                 goto out;
1184                         case -ERESTARTSYS:
1185                                 /*
1186                                  * The show must go on: exit, but mark the
1187                                  * stateid as needing recovery.
1188                                  */
1189                         case -NFS4ERR_ADMIN_REVOKED:
1190                         case -NFS4ERR_BAD_STATEID:
1191                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1192                         case -ENOMEM:
1193                                 err = 0;
1194                                 goto out;
1195                 }
1196                 err = nfs4_handle_exception(server, err, &exception);
1197         } while (exception.retry);
1198 out:
1199         return err;
1200 }
1201
1202 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1203 {
1204         struct nfs4_opendata *data = calldata;
1205
1206         data->rpc_status = task->tk_status;
1207         if (RPC_ASSASSINATED(task))
1208                 return;
1209         if (data->rpc_status == 0) {
1210                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1211                                 sizeof(data->o_res.stateid.data));
1212                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1213                 renew_lease(data->o_res.server, data->timestamp);
1214                 data->rpc_done = 1;
1215         }
1216 }
1217
1218 static void nfs4_open_confirm_release(void *calldata)
1219 {
1220         struct nfs4_opendata *data = calldata;
1221         struct nfs4_state *state = NULL;
1222
1223         /* If this request hasn't been cancelled, do nothing */
1224         if (data->cancelled == 0)
1225                 goto out_free;
1226         /* In case of error, no cleanup! */
1227         if (!data->rpc_done)
1228                 goto out_free;
1229         state = nfs4_opendata_to_nfs4_state(data);
1230         if (!IS_ERR(state))
1231                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1232 out_free:
1233         nfs4_opendata_put(data);
1234 }
1235
1236 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1237         .rpc_call_done = nfs4_open_confirm_done,
1238         .rpc_release = nfs4_open_confirm_release,
1239 };
1240
1241 /*
1242  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1243  */
1244 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1245 {
1246         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1247         struct rpc_task *task;
1248         struct  rpc_message msg = {
1249                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1250                 .rpc_argp = &data->c_arg,
1251                 .rpc_resp = &data->c_res,
1252                 .rpc_cred = data->owner->so_cred,
1253         };
1254         struct rpc_task_setup task_setup_data = {
1255                 .rpc_client = server->client,
1256                 .rpc_message = &msg,
1257                 .callback_ops = &nfs4_open_confirm_ops,
1258                 .callback_data = data,
1259                 .workqueue = nfsiod_workqueue,
1260                 .flags = RPC_TASK_ASYNC,
1261         };
1262         int status;
1263
1264         kref_get(&data->kref);
1265         data->rpc_done = 0;
1266         data->rpc_status = 0;
1267         data->timestamp = jiffies;
1268         task = rpc_run_task(&task_setup_data);
1269         if (IS_ERR(task))
1270                 return PTR_ERR(task);
1271         status = nfs4_wait_for_completion_rpc_task(task);
1272         if (status != 0) {
1273                 data->cancelled = 1;
1274                 smp_wmb();
1275         } else
1276                 status = data->rpc_status;
1277         rpc_put_task(task);
1278         return status;
1279 }
1280
1281 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1282 {
1283         struct nfs4_opendata *data = calldata;
1284         struct nfs4_state_owner *sp = data->owner;
1285
1286         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1287                 return;
1288         /*
1289          * Check if we still need to send an OPEN call, or if we can use
1290          * a delegation instead.
1291          */
1292         if (data->state != NULL) {
1293                 struct nfs_delegation *delegation;
1294
1295                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1296                         goto out_no_action;
1297                 rcu_read_lock();
1298                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1299                 if (delegation != NULL &&
1300                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1301                         rcu_read_unlock();
1302                         goto out_no_action;
1303                 }
1304                 rcu_read_unlock();
1305         }
1306         /* Update sequence id. */
1307         data->o_arg.id = sp->so_owner_id.id;
1308         data->o_arg.clientid = sp->so_client->cl_clientid;
1309         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1310                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1311                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1312         }
1313         data->timestamp = jiffies;
1314         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1315                                 &data->o_arg.seq_args,
1316                                 &data->o_res.seq_res, 1, task))
1317                 return;
1318         rpc_call_start(task);
1319         return;
1320 out_no_action:
1321         task->tk_action = NULL;
1322
1323 }
1324
1325 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1326 {
1327         struct nfs4_opendata *data = calldata;
1328
1329         data->rpc_status = task->tk_status;
1330
1331         nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
1332                                      task->tk_status);
1333
1334         if (RPC_ASSASSINATED(task))
1335                 return;
1336         if (task->tk_status == 0) {
1337                 switch (data->o_res.f_attr->mode & S_IFMT) {
1338                         case S_IFREG:
1339                                 break;
1340                         case S_IFLNK:
1341                                 data->rpc_status = -ELOOP;
1342                                 break;
1343                         case S_IFDIR:
1344                                 data->rpc_status = -EISDIR;
1345                                 break;
1346                         default:
1347                                 data->rpc_status = -ENOTDIR;
1348                 }
1349                 renew_lease(data->o_res.server, data->timestamp);
1350                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1351                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1352         }
1353         data->rpc_done = 1;
1354 }
1355
1356 static void nfs4_open_release(void *calldata)
1357 {
1358         struct nfs4_opendata *data = calldata;
1359         struct nfs4_state *state = NULL;
1360
1361         /* If this request hasn't been cancelled, do nothing */
1362         if (data->cancelled == 0)
1363                 goto out_free;
1364         /* In case of error, no cleanup! */
1365         if (data->rpc_status != 0 || !data->rpc_done)
1366                 goto out_free;
1367         /* In case we need an open_confirm, no cleanup! */
1368         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1369                 goto out_free;
1370         state = nfs4_opendata_to_nfs4_state(data);
1371         if (!IS_ERR(state))
1372                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1373 out_free:
1374         nfs4_opendata_put(data);
1375 }
1376
1377 static const struct rpc_call_ops nfs4_open_ops = {
1378         .rpc_call_prepare = nfs4_open_prepare,
1379         .rpc_call_done = nfs4_open_done,
1380         .rpc_release = nfs4_open_release,
1381 };
1382
1383 /*
1384  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1385  */
1386 static int _nfs4_proc_open(struct nfs4_opendata *data)
1387 {
1388         struct inode *dir = data->dir->d_inode;
1389         struct nfs_server *server = NFS_SERVER(dir);
1390         struct nfs_openargs *o_arg = &data->o_arg;
1391         struct nfs_openres *o_res = &data->o_res;
1392         struct rpc_task *task;
1393         struct rpc_message msg = {
1394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1395                 .rpc_argp = o_arg,
1396                 .rpc_resp = o_res,
1397                 .rpc_cred = data->owner->so_cred,
1398         };
1399         struct rpc_task_setup task_setup_data = {
1400                 .rpc_client = server->client,
1401                 .rpc_message = &msg,
1402                 .callback_ops = &nfs4_open_ops,
1403                 .callback_data = data,
1404                 .workqueue = nfsiod_workqueue,
1405                 .flags = RPC_TASK_ASYNC,
1406         };
1407         int status;
1408
1409         kref_get(&data->kref);
1410         data->rpc_done = 0;
1411         data->rpc_status = 0;
1412         data->cancelled = 0;
1413         task = rpc_run_task(&task_setup_data);
1414         if (IS_ERR(task))
1415                 return PTR_ERR(task);
1416         status = nfs4_wait_for_completion_rpc_task(task);
1417         if (status != 0) {
1418                 data->cancelled = 1;
1419                 smp_wmb();
1420         } else
1421                 status = data->rpc_status;
1422         rpc_put_task(task);
1423         if (status != 0 || !data->rpc_done)
1424                 return status;
1425
1426         if (o_res->fh.size == 0)
1427                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1428
1429         if (o_arg->open_flags & O_CREAT) {
1430                 update_changeattr(dir, &o_res->cinfo);
1431                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1432         } else
1433                 nfs_refresh_inode(dir, o_res->dir_attr);
1434         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1435                 status = _nfs4_proc_open_confirm(data);
1436                 if (status != 0)
1437                         return status;
1438         }
1439         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1440                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1441         return 0;
1442 }
1443
1444 static int nfs4_recover_expired_lease(struct nfs_server *server)
1445 {
1446         struct nfs_client *clp = server->nfs_client;
1447         int ret;
1448
1449         for (;;) {
1450                 ret = nfs4_wait_clnt_recover(clp);
1451                 if (ret != 0)
1452                         return ret;
1453                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1454                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1455                         break;
1456                 nfs4_schedule_state_recovery(clp);
1457         }
1458         return 0;
1459 }
1460
1461 /*
1462  * OPEN_EXPIRED:
1463  *      reclaim state on the server after a network partition.
1464  *      Assumes caller holds the appropriate lock
1465  */
1466 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1467 {
1468         struct nfs4_opendata *opendata;
1469         int ret;
1470
1471         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1472         if (IS_ERR(opendata))
1473                 return PTR_ERR(opendata);
1474         ret = nfs4_open_recover(opendata, state);
1475         if (ret == -ESTALE)
1476                 d_drop(ctx->path.dentry);
1477         nfs4_opendata_put(opendata);
1478         return ret;
1479 }
1480
1481 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1482 {
1483         struct nfs_server *server = NFS_SERVER(state->inode);
1484         struct nfs4_exception exception = { };
1485         int err;
1486
1487         do {
1488                 err = _nfs4_open_expired(ctx, state);
1489                 if (err != -NFS4ERR_DELAY)
1490                         break;
1491                 nfs4_handle_exception(server, err, &exception);
1492         } while (exception.retry);
1493         return err;
1494 }
1495
1496 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1497 {
1498         struct nfs_open_context *ctx;
1499         int ret;
1500
1501         ctx = nfs4_state_find_open_context(state);
1502         if (IS_ERR(ctx))
1503                 return PTR_ERR(ctx);
1504         ret = nfs4_do_open_expired(ctx, state);
1505         put_nfs_open_context(ctx);
1506         return ret;
1507 }
1508
1509 /*
1510  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1511  * fields corresponding to attributes that were used to store the verifier.
1512  * Make sure we clobber those fields in the later setattr call
1513  */
1514 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1515 {
1516         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1517             !(sattr->ia_valid & ATTR_ATIME_SET))
1518                 sattr->ia_valid |= ATTR_ATIME;
1519
1520         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1521             !(sattr->ia_valid & ATTR_MTIME_SET))
1522                 sattr->ia_valid |= ATTR_MTIME;
1523 }
1524
1525 /*
1526  * Returns a referenced nfs4_state
1527  */
1528 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)
1529 {
1530         struct nfs4_state_owner  *sp;
1531         struct nfs4_state     *state = NULL;
1532         struct nfs_server       *server = NFS_SERVER(dir);
1533         struct nfs4_opendata *opendata;
1534         int status;
1535
1536         /* Protect against reboot recovery conflicts */
1537         status = -ENOMEM;
1538         if (!(sp = nfs4_get_state_owner(server, cred))) {
1539                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1540                 goto out_err;
1541         }
1542         status = nfs4_recover_expired_lease(server);
1543         if (status != 0)
1544                 goto err_put_state_owner;
1545         if (path->dentry->d_inode != NULL)
1546                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1547         status = -ENOMEM;
1548         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1549         if (opendata == NULL)
1550                 goto err_put_state_owner;
1551
1552         if (path->dentry->d_inode != NULL)
1553                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1554
1555         status = _nfs4_proc_open(opendata);
1556         if (status != 0)
1557                 goto err_opendata_put;
1558
1559         if (opendata->o_arg.open_flags & O_EXCL)
1560                 nfs4_exclusive_attrset(opendata, sattr);
1561
1562         state = nfs4_opendata_to_nfs4_state(opendata);
1563         status = PTR_ERR(state);
1564         if (IS_ERR(state))
1565                 goto err_opendata_put;
1566         nfs4_opendata_put(opendata);
1567         nfs4_put_state_owner(sp);
1568         *res = state;
1569         return 0;
1570 err_opendata_put:
1571         nfs4_opendata_put(opendata);
1572 err_put_state_owner:
1573         nfs4_put_state_owner(sp);
1574 out_err:
1575         *res = NULL;
1576         return status;
1577 }
1578
1579
1580 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)
1581 {
1582         struct nfs4_exception exception = { };
1583         struct nfs4_state *res;
1584         int status;
1585
1586         do {
1587                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1588                 if (status == 0)
1589                         break;
1590                 /* NOTE: BAD_SEQID means the server and client disagree about the
1591                  * book-keeping w.r.t. state-changing operations
1592                  * (OPEN/CLOSE/LOCK/LOCKU...)
1593                  * It is actually a sign of a bug on the client or on the server.
1594                  *
1595                  * If we receive a BAD_SEQID error in the particular case of
1596                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1597                  * have unhashed the old state_owner for us, and that we can
1598                  * therefore safely retry using a new one. We should still warn
1599                  * the user though...
1600                  */
1601                 if (status == -NFS4ERR_BAD_SEQID) {
1602                         printk(KERN_WARNING "NFS: v4 server %s "
1603                                         " returned a bad sequence-id error!\n",
1604                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1605                         exception.retry = 1;
1606                         continue;
1607                 }
1608                 /*
1609                  * BAD_STATEID on OPEN means that the server cancelled our
1610                  * state before it received the OPEN_CONFIRM.
1611                  * Recover by retrying the request as per the discussion
1612                  * on Page 181 of RFC3530.
1613                  */
1614                 if (status == -NFS4ERR_BAD_STATEID) {
1615                         exception.retry = 1;
1616                         continue;
1617                 }
1618                 if (status == -EAGAIN) {
1619                         /* We must have found a delegation */
1620                         exception.retry = 1;
1621                         continue;
1622                 }
1623                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1624                                         status, &exception));
1625         } while (exception.retry);
1626         return res;
1627 }
1628
1629 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1630                             struct nfs_fattr *fattr, struct iattr *sattr,
1631                             struct nfs4_state *state)
1632 {
1633         struct nfs_server *server = NFS_SERVER(inode);
1634         struct nfs_setattrargs  arg = {
1635                 .fh             = NFS_FH(inode),
1636                 .iap            = sattr,
1637                 .server         = server,
1638                 .bitmask = server->attr_bitmask,
1639         };
1640         struct nfs_setattrres  res = {
1641                 .fattr          = fattr,
1642                 .server         = server,
1643         };
1644         struct rpc_message msg = {
1645                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1646                 .rpc_argp       = &arg,
1647                 .rpc_resp       = &res,
1648                 .rpc_cred       = cred,
1649         };
1650         unsigned long timestamp = jiffies;
1651         int status;
1652
1653         nfs_fattr_init(fattr);
1654
1655         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1656                 /* Use that stateid */
1657         } else if (state != NULL) {
1658                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1659         } else
1660                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1661
1662         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1663         if (status == 0 && state != NULL)
1664                 renew_lease(server, timestamp);
1665         return status;
1666 }
1667
1668 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1669                            struct nfs_fattr *fattr, struct iattr *sattr,
1670                            struct nfs4_state *state)
1671 {
1672         struct nfs_server *server = NFS_SERVER(inode);
1673         struct nfs4_exception exception = { };
1674         int err;
1675         do {
1676                 err = nfs4_handle_exception(server,
1677                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1678                                 &exception);
1679         } while (exception.retry);
1680         return err;
1681 }
1682
1683 struct nfs4_closedata {
1684         struct path path;
1685         struct inode *inode;
1686         struct nfs4_state *state;
1687         struct nfs_closeargs arg;
1688         struct nfs_closeres res;
1689         struct nfs_fattr fattr;
1690         unsigned long timestamp;
1691 };
1692
1693 static void nfs4_free_closedata(void *data)
1694 {
1695         struct nfs4_closedata *calldata = data;
1696         struct nfs4_state_owner *sp = calldata->state->owner;
1697
1698         nfs4_put_open_state(calldata->state);
1699         nfs_free_seqid(calldata->arg.seqid);
1700         nfs4_put_state_owner(sp);
1701         path_put(&calldata->path);
1702         kfree(calldata);
1703 }
1704
1705 static void nfs4_close_done(struct rpc_task *task, void *data)
1706 {
1707         struct nfs4_closedata *calldata = data;
1708         struct nfs4_state *state = calldata->state;
1709         struct nfs_server *server = NFS_SERVER(calldata->inode);
1710
1711         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1712         if (RPC_ASSASSINATED(task))
1713                 return;
1714         /* hmm. we are done with the inode, and in the process of freeing
1715          * the state_owner. we keep this around to process errors
1716          */
1717         switch (task->tk_status) {
1718                 case 0:
1719                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1720                         renew_lease(server, calldata->timestamp);
1721                         break;
1722                 case -NFS4ERR_STALE_STATEID:
1723                 case -NFS4ERR_OLD_STATEID:
1724                 case -NFS4ERR_BAD_STATEID:
1725                 case -NFS4ERR_EXPIRED:
1726                         if (calldata->arg.fmode == 0)
1727                                 break;
1728                 default:
1729                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1730                                 nfs4_restart_rpc(task, server->nfs_client);
1731                                 return;
1732                         }
1733         }
1734         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1735         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1736 }
1737
1738 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1739 {
1740         struct nfs4_closedata *calldata = data;
1741         struct nfs4_state *state = calldata->state;
1742         int clear_rd, clear_wr, clear_rdwr;
1743
1744         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1745                 return;
1746
1747         clear_rd = clear_wr = clear_rdwr = 0;
1748         spin_lock(&state->owner->so_lock);
1749         /* Calculate the change in open mode */
1750         if (state->n_rdwr == 0) {
1751                 if (state->n_rdonly == 0) {
1752                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1753                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1754                 }
1755                 if (state->n_wronly == 0) {
1756                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1757                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1758                 }
1759         }
1760         spin_unlock(&state->owner->so_lock);
1761         if (!clear_rd && !clear_wr && !clear_rdwr) {
1762                 /* Note: exit _without_ calling nfs4_close_done */
1763                 task->tk_action = NULL;
1764                 return;
1765         }
1766         nfs_fattr_init(calldata->res.fattr);
1767         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1768                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1769                 calldata->arg.fmode = FMODE_READ;
1770         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1771                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1772                 calldata->arg.fmode = FMODE_WRITE;
1773         }
1774         calldata->timestamp = jiffies;
1775         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1776                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1777                                 1, task))
1778                 return;
1779         rpc_call_start(task);
1780 }
1781
1782 static const struct rpc_call_ops nfs4_close_ops = {
1783         .rpc_call_prepare = nfs4_close_prepare,
1784         .rpc_call_done = nfs4_close_done,
1785         .rpc_release = nfs4_free_closedata,
1786 };
1787
1788 /*
1789  * It is possible for data to be read/written from a mem-mapped file
1790  * after the sys_close call (which hits the vfs layer as a flush).
1791  * This means that we can't safely call nfsv4 close on a file until
1792  * the inode is cleared. This in turn means that we are not good
1793  * NFSv4 citizens - we do not indicate to the server to update the file's
1794  * share state even when we are done with one of the three share
1795  * stateid's in the inode.
1796  *
1797  * NOTE: Caller must be holding the sp->so_owner semaphore!
1798  */
1799 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1800 {
1801         struct nfs_server *server = NFS_SERVER(state->inode);
1802         struct nfs4_closedata *calldata;
1803         struct nfs4_state_owner *sp = state->owner;
1804         struct rpc_task *task;
1805         struct rpc_message msg = {
1806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1807                 .rpc_cred = state->owner->so_cred,
1808         };
1809         struct rpc_task_setup task_setup_data = {
1810                 .rpc_client = server->client,
1811                 .rpc_message = &msg,
1812                 .callback_ops = &nfs4_close_ops,
1813                 .workqueue = nfsiod_workqueue,
1814                 .flags = RPC_TASK_ASYNC,
1815         };
1816         int status = -ENOMEM;
1817
1818         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1819         if (calldata == NULL)
1820                 goto out;
1821         calldata->inode = state->inode;
1822         calldata->state = state;
1823         calldata->arg.fh = NFS_FH(state->inode);
1824         calldata->arg.stateid = &state->open_stateid;
1825         if (nfs4_has_session(server->nfs_client))
1826                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1827         /* Serialization for the sequence id */
1828         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1829         if (calldata->arg.seqid == NULL)
1830                 goto out_free_calldata;
1831         calldata->arg.fmode = 0;
1832         calldata->arg.bitmask = server->cache_consistency_bitmask;
1833         calldata->res.fattr = &calldata->fattr;
1834         calldata->res.seqid = calldata->arg.seqid;
1835         calldata->res.server = server;
1836         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1837         calldata->path.mnt = mntget(path->mnt);
1838         calldata->path.dentry = dget(path->dentry);
1839
1840         msg.rpc_argp = &calldata->arg,
1841         msg.rpc_resp = &calldata->res,
1842         task_setup_data.callback_data = calldata;
1843         task = rpc_run_task(&task_setup_data);
1844         if (IS_ERR(task))
1845                 return PTR_ERR(task);
1846         status = 0;
1847         if (wait)
1848                 status = rpc_wait_for_completion_task(task);
1849         rpc_put_task(task);
1850         return status;
1851 out_free_calldata:
1852         kfree(calldata);
1853 out:
1854         nfs4_put_open_state(state);
1855         nfs4_put_state_owner(sp);
1856         return status;
1857 }
1858
1859 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1860 {
1861         struct file *filp;
1862         int ret;
1863
1864         /* If the open_intent is for execute, we have an extra check to make */
1865         if (fmode & FMODE_EXEC) {
1866                 ret = nfs_may_open(state->inode,
1867                                 state->owner->so_cred,
1868                                 nd->intent.open.flags);
1869                 if (ret < 0)
1870                         goto out_close;
1871         }
1872         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1873         if (!IS_ERR(filp)) {
1874                 struct nfs_open_context *ctx;
1875                 ctx = nfs_file_open_context(filp);
1876                 ctx->state = state;
1877                 return 0;
1878         }
1879         ret = PTR_ERR(filp);
1880 out_close:
1881         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1882         return ret;
1883 }
1884
1885 struct dentry *
1886 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1887 {
1888         struct path path = {
1889                 .mnt = nd->path.mnt,
1890                 .dentry = dentry,
1891         };
1892         struct dentry *parent;
1893         struct iattr attr;
1894         struct rpc_cred *cred;
1895         struct nfs4_state *state;
1896         struct dentry *res;
1897         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1898
1899         if (nd->flags & LOOKUP_CREATE) {
1900                 attr.ia_mode = nd->intent.open.create_mode;
1901                 attr.ia_valid = ATTR_MODE;
1902                 if (!IS_POSIXACL(dir))
1903                         attr.ia_mode &= ~current_umask();
1904         } else {
1905                 attr.ia_valid = 0;
1906                 BUG_ON(nd->intent.open.flags & O_CREAT);
1907         }
1908
1909         cred = rpc_lookup_cred();
1910         if (IS_ERR(cred))
1911                 return (struct dentry *)cred;
1912         parent = dentry->d_parent;
1913         /* Protect against concurrent sillydeletes */
1914         nfs_block_sillyrename(parent);
1915         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1916         put_rpccred(cred);
1917         if (IS_ERR(state)) {
1918                 if (PTR_ERR(state) == -ENOENT) {
1919                         d_add(dentry, NULL);
1920                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1921                 }
1922                 nfs_unblock_sillyrename(parent);
1923                 return (struct dentry *)state;
1924         }
1925         res = d_add_unique(dentry, igrab(state->inode));
1926         if (res != NULL)
1927                 path.dentry = res;
1928         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1929         nfs_unblock_sillyrename(parent);
1930         nfs4_intent_set_file(nd, &path, state, fmode);
1931         return res;
1932 }
1933
1934 int
1935 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1936 {
1937         struct path path = {
1938                 .mnt = nd->path.mnt,
1939                 .dentry = dentry,
1940         };
1941         struct rpc_cred *cred;
1942         struct nfs4_state *state;
1943         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1944
1945         cred = rpc_lookup_cred();
1946         if (IS_ERR(cred))
1947                 return PTR_ERR(cred);
1948         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1949         put_rpccred(cred);
1950         if (IS_ERR(state)) {
1951                 switch (PTR_ERR(state)) {
1952                         case -EPERM:
1953                         case -EACCES:
1954                         case -EDQUOT:
1955                         case -ENOSPC:
1956                         case -EROFS:
1957                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1958                                 return 1;
1959                         default:
1960                                 goto out_drop;
1961                 }
1962         }
1963         if (state->inode == dentry->d_inode) {
1964                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1965                 nfs4_intent_set_file(nd, &path, state, fmode);
1966                 return 1;
1967         }
1968         nfs4_close_sync(&path, state, fmode);
1969 out_drop:
1970         d_drop(dentry);
1971         return 0;
1972 }
1973
1974 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1975 {
1976         if (ctx->state == NULL)
1977                 return;
1978         if (is_sync)
1979                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1980         else
1981                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1982 }
1983
1984 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1985 {
1986         struct nfs4_server_caps_arg args = {
1987                 .fhandle = fhandle,
1988         };
1989         struct nfs4_server_caps_res res = {};
1990         struct rpc_message msg = {
1991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1992                 .rpc_argp = &args,
1993                 .rpc_resp = &res,
1994         };
1995         int status;
1996
1997         status = nfs4_call_sync(server, &msg, &args, &res, 0);
1998         if (status == 0) {
1999                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2000                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2001                         server->caps |= NFS_CAP_ACLS;
2002                 if (res.has_links != 0)
2003                         server->caps |= NFS_CAP_HARDLINKS;
2004                 if (res.has_symlinks != 0)
2005                         server->caps |= NFS_CAP_SYMLINKS;
2006                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2007                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2008                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2009                 server->acl_bitmask = res.acl_bitmask;
2010         }
2011
2012         return status;
2013 }
2014
2015 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2016 {
2017         struct nfs4_exception exception = { };
2018         int err;
2019         do {
2020                 err = nfs4_handle_exception(server,
2021                                 _nfs4_server_capabilities(server, fhandle),
2022                                 &exception);
2023         } while (exception.retry);
2024         return err;
2025 }
2026
2027 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2028                 struct nfs_fsinfo *info)
2029 {
2030         struct nfs4_lookup_root_arg args = {
2031                 .bitmask = nfs4_fattr_bitmap,
2032         };
2033         struct nfs4_lookup_res res = {
2034                 .server = server,
2035                 .fattr = info->fattr,
2036                 .fh = fhandle,
2037         };
2038         struct rpc_message msg = {
2039                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2040                 .rpc_argp = &args,
2041                 .rpc_resp = &res,
2042         };
2043
2044         nfs_fattr_init(info->fattr);
2045         return nfs4_call_sync(server, &msg, &args, &res, 0);
2046 }
2047
2048 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2049                 struct nfs_fsinfo *info)
2050 {
2051         struct nfs4_exception exception = { };
2052         int err;
2053         do {
2054                 err = nfs4_handle_exception(server,
2055                                 _nfs4_lookup_root(server, fhandle, info),
2056                                 &exception);
2057         } while (exception.retry);
2058         return err;
2059 }
2060
2061 /*
2062  * get the file handle for the "/" directory on the server
2063  */
2064 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2065                               struct nfs_fsinfo *info)
2066 {
2067         int status;
2068
2069         status = nfs4_lookup_root(server, fhandle, info);
2070         if (status == 0)
2071                 status = nfs4_server_capabilities(server, fhandle);
2072         if (status == 0)
2073                 status = nfs4_do_fsinfo(server, fhandle, info);
2074         return nfs4_map_errors(status);
2075 }
2076
2077 /*
2078  * Get locations and (maybe) other attributes of a referral.
2079  * Note that we'll actually follow the referral later when
2080  * we detect fsid mismatch in inode revalidation
2081  */
2082 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2083 {
2084         int status = -ENOMEM;
2085         struct page *page = NULL;
2086         struct nfs4_fs_locations *locations = NULL;
2087
2088         page = alloc_page(GFP_KERNEL);
2089         if (page == NULL)
2090                 goto out;
2091         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2092         if (locations == NULL)
2093                 goto out;
2094
2095         status = nfs4_proc_fs_locations(dir, name, locations, page);
2096         if (status != 0)
2097                 goto out;
2098         /* Make sure server returned a different fsid for the referral */
2099         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2100                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2101                 status = -EIO;
2102                 goto out;
2103         }
2104
2105         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2106         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2107         if (!fattr->mode)
2108                 fattr->mode = S_IFDIR;
2109         memset(fhandle, 0, sizeof(struct nfs_fh));
2110 out:
2111         if (page)
2112                 __free_page(page);
2113         if (locations)
2114                 kfree(locations);
2115         return status;
2116 }
2117
2118 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2119 {
2120         struct nfs4_getattr_arg args = {
2121                 .fh = fhandle,
2122                 .bitmask = server->attr_bitmask,
2123         };
2124         struct nfs4_getattr_res res = {
2125                 .fattr = fattr,
2126                 .server = server,
2127         };
2128         struct rpc_message msg = {
2129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2130                 .rpc_argp = &args,
2131                 .rpc_resp = &res,
2132         };
2133
2134         nfs_fattr_init(fattr);
2135         return nfs4_call_sync(server, &msg, &args, &res, 0);
2136 }
2137
2138 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2139 {
2140         struct nfs4_exception exception = { };
2141         int err;
2142         do {
2143                 err = nfs4_handle_exception(server,
2144                                 _nfs4_proc_getattr(server, fhandle, fattr),
2145                                 &exception);
2146         } while (exception.retry);
2147         return err;
2148 }
2149
2150 /*
2151  * The file is not closed if it is opened due to the a request to change
2152  * the size of the file. The open call will not be needed once the
2153  * VFS layer lookup-intents are implemented.
2154  *
2155  * Close is called when the inode is destroyed.
2156  * If we haven't opened the file for O_WRONLY, we
2157  * need to in the size_change case to obtain a stateid.
2158  *
2159  * Got race?
2160  * Because OPEN is always done by name in nfsv4, it is
2161  * possible that we opened a different file by the same
2162  * name.  We can recognize this race condition, but we
2163  * can't do anything about it besides returning an error.
2164  *
2165  * This will be fixed with VFS changes (lookup-intent).
2166  */
2167 static int
2168 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2169                   struct iattr *sattr)
2170 {
2171         struct inode *inode = dentry->d_inode;
2172         struct rpc_cred *cred = NULL;
2173         struct nfs4_state *state = NULL;
2174         int status;
2175
2176         nfs_fattr_init(fattr);
2177
2178         /* Search for an existing open(O_WRITE) file */
2179         if (sattr->ia_valid & ATTR_FILE) {
2180                 struct nfs_open_context *ctx;
2181
2182                 ctx = nfs_file_open_context(sattr->ia_file);
2183                 if (ctx) {
2184                         cred = ctx->cred;
2185                         state = ctx->state;
2186                 }
2187         }
2188
2189         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2190         if (status == 0)
2191                 nfs_setattr_update_inode(inode, sattr);
2192         return status;
2193 }
2194
2195 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2196                 const struct qstr *name, struct nfs_fh *fhandle,
2197                 struct nfs_fattr *fattr)
2198 {
2199         int                    status;
2200         struct nfs4_lookup_arg args = {
2201                 .bitmask = server->attr_bitmask,
2202                 .dir_fh = dirfh,
2203                 .name = name,
2204         };
2205         struct nfs4_lookup_res res = {
2206                 .server = server,
2207                 .fattr = fattr,
2208                 .fh = fhandle,
2209         };
2210         struct rpc_message msg = {
2211                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2212                 .rpc_argp = &args,
2213                 .rpc_resp = &res,
2214         };
2215
2216         nfs_fattr_init(fattr);
2217
2218         dprintk("NFS call  lookupfh %s\n", name->name);
2219         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2220         dprintk("NFS reply lookupfh: %d\n", status);
2221         return status;
2222 }
2223
2224 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2225                               struct qstr *name, struct nfs_fh *fhandle,
2226                               struct nfs_fattr *fattr)
2227 {
2228         struct nfs4_exception exception = { };
2229         int err;
2230         do {
2231                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2232                 /* FIXME: !!!! */
2233                 if (err == -NFS4ERR_MOVED) {
2234                         err = -EREMOTE;
2235                         break;
2236                 }
2237                 err = nfs4_handle_exception(server, err, &exception);
2238         } while (exception.retry);
2239         return err;
2240 }
2241
2242 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2243                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2244 {
2245         int status;
2246
2247         dprintk("NFS call  lookup %s\n", name->name);
2248         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2249         if (status == -NFS4ERR_MOVED)
2250                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2251         dprintk("NFS reply lookup: %d\n", status);
2252         return status;
2253 }
2254
2255 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2256 {
2257         struct nfs4_exception exception = { };
2258         int err;
2259         do {
2260                 err = nfs4_handle_exception(NFS_SERVER(dir),
2261                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2262                                 &exception);
2263         } while (exception.retry);
2264         return err;
2265 }
2266
2267 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2268 {
2269         struct nfs_server *server = NFS_SERVER(inode);
2270         struct nfs_fattr fattr;
2271         struct nfs4_accessargs args = {
2272                 .fh = NFS_FH(inode),
2273                 .bitmask = server->attr_bitmask,
2274         };
2275         struct nfs4_accessres res = {
2276                 .server = server,
2277                 .fattr = &fattr,
2278         };
2279         struct rpc_message msg = {
2280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2281                 .rpc_argp = &args,
2282                 .rpc_resp = &res,
2283                 .rpc_cred = entry->cred,
2284         };
2285         int mode = entry->mask;
2286         int status;
2287
2288         /*
2289          * Determine which access bits we want to ask for...
2290          */
2291         if (mode & MAY_READ)
2292                 args.access |= NFS4_ACCESS_READ;
2293         if (S_ISDIR(inode->i_mode)) {
2294                 if (mode & MAY_WRITE)
2295                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2296                 if (mode & MAY_EXEC)
2297                         args.access |= NFS4_ACCESS_LOOKUP;
2298         } else {
2299                 if (mode & MAY_WRITE)
2300                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2301                 if (mode & MAY_EXEC)
2302                         args.access |= NFS4_ACCESS_EXECUTE;
2303         }
2304         nfs_fattr_init(&fattr);
2305         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2306         if (!status) {
2307                 entry->mask = 0;
2308                 if (res.access & NFS4_ACCESS_READ)
2309                         entry->mask |= MAY_READ;
2310                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2311                         entry->mask |= MAY_WRITE;
2312                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2313                         entry->mask |= MAY_EXEC;
2314                 nfs_refresh_inode(inode, &fattr);
2315         }
2316         return status;
2317 }
2318
2319 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2320 {
2321         struct nfs4_exception exception = { };
2322         int err;
2323         do {
2324                 err = nfs4_handle_exception(NFS_SERVER(inode),
2325                                 _nfs4_proc_access(inode, entry),
2326                                 &exception);
2327         } while (exception.retry);
2328         return err;
2329 }
2330
2331 /*
2332  * TODO: For the time being, we don't try to get any attributes
2333  * along with any of the zero-copy operations READ, READDIR,
2334  * READLINK, WRITE.
2335  *
2336  * In the case of the first three, we want to put the GETATTR
2337  * after the read-type operation -- this is because it is hard
2338  * to predict the length of a GETATTR response in v4, and thus
2339  * align the READ data correctly.  This means that the GETATTR
2340  * may end up partially falling into the page cache, and we should
2341  * shift it into the 'tail' of the xdr_buf before processing.
2342  * To do this efficiently, we need to know the total length
2343  * of data received, which doesn't seem to be available outside
2344  * of the RPC layer.
2345  *
2346  * In the case of WRITE, we also want to put the GETATTR after
2347  * the operation -- in this case because we want to make sure
2348  * we get the post-operation mtime and size.  This means that
2349  * we can't use xdr_encode_pages() as written: we need a variant
2350  * of it which would leave room in the 'tail' iovec.
2351  *
2352  * Both of these changes to the XDR layer would in fact be quite
2353  * minor, but I decided to leave them for a subsequent patch.
2354  */
2355 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2356                 unsigned int pgbase, unsigned int pglen)
2357 {
2358         struct nfs4_readlink args = {
2359                 .fh       = NFS_FH(inode),
2360                 .pgbase   = pgbase,
2361                 .pglen    = pglen,
2362                 .pages    = &page,
2363         };
2364         struct nfs4_readlink_res res;
2365         struct rpc_message msg = {
2366                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2367                 .rpc_argp = &args,
2368                 .rpc_resp = &res,
2369         };
2370
2371         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2372 }
2373
2374 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2375                 unsigned int pgbase, unsigned int pglen)
2376 {
2377         struct nfs4_exception exception = { };
2378         int err;
2379         do {
2380                 err = nfs4_handle_exception(NFS_SERVER(inode),
2381                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2382                                 &exception);
2383         } while (exception.retry);
2384         return err;
2385 }
2386
2387 /*
2388  * Got race?
2389  * We will need to arrange for the VFS layer to provide an atomic open.
2390  * Until then, this create/open method is prone to inefficiency and race
2391  * conditions due to the lookup, create, and open VFS calls from sys_open()
2392  * placed on the wire.
2393  *
2394  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2395  * The file will be opened again in the subsequent VFS open call
2396  * (nfs4_proc_file_open).
2397  *
2398  * The open for read will just hang around to be used by any process that
2399  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2400  */
2401
2402 static int
2403 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2404                  int flags, struct nameidata *nd)
2405 {
2406         struct path path = {
2407                 .mnt = nd->path.mnt,
2408                 .dentry = dentry,
2409         };
2410         struct nfs4_state *state;
2411         struct rpc_cred *cred;
2412         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2413         int status = 0;
2414
2415         cred = rpc_lookup_cred();
2416         if (IS_ERR(cred)) {
2417                 status = PTR_ERR(cred);
2418                 goto out;
2419         }
2420         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2421         d_drop(dentry);
2422         if (IS_ERR(state)) {
2423                 status = PTR_ERR(state);
2424                 goto out_putcred;
2425         }
2426         d_add(dentry, igrab(state->inode));
2427         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2428         if (flags & O_EXCL) {
2429                 struct nfs_fattr fattr;
2430                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2431                 if (status == 0)
2432                         nfs_setattr_update_inode(state->inode, sattr);
2433                 nfs_post_op_update_inode(state->inode, &fattr);
2434         }
2435         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2436                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2437         else
2438                 nfs4_close_sync(&path, state, fmode);
2439 out_putcred:
2440         put_rpccred(cred);
2441 out:
2442         return status;
2443 }
2444
2445 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2446 {
2447         struct nfs_server *server = NFS_SERVER(dir);
2448         struct nfs_removeargs args = {
2449                 .fh = NFS_FH(dir),
2450                 .name.len = name->len,
2451                 .name.name = name->name,
2452                 .bitmask = server->attr_bitmask,
2453         };
2454         struct nfs_removeres res = {
2455                 .server = server,
2456         };
2457         struct rpc_message msg = {
2458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2459                 .rpc_argp = &args,
2460                 .rpc_resp = &res,
2461         };
2462         int                     status;
2463
2464         nfs_fattr_init(&res.dir_attr);
2465         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2466         if (status == 0) {
2467                 update_changeattr(dir, &res.cinfo);
2468                 nfs_post_op_update_inode(dir, &res.dir_attr);
2469         }
2470         return status;
2471 }
2472
2473 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2474 {
2475         struct nfs4_exception exception = { };
2476         int err;
2477         do {
2478                 err = nfs4_handle_exception(NFS_SERVER(dir),
2479                                 _nfs4_proc_remove(dir, name),
2480                                 &exception);
2481         } while (exception.retry);
2482         return err;
2483 }
2484
2485 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2486 {
2487         struct nfs_server *server = NFS_SERVER(dir);
2488         struct nfs_removeargs *args = msg->rpc_argp;
2489         struct nfs_removeres *res = msg->rpc_resp;
2490
2491         args->bitmask = server->cache_consistency_bitmask;
2492         res->server = server;
2493         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2494 }
2495
2496 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2497 {
2498         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2499
2500         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2501         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2502                 return 0;
2503         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2504         update_changeattr(dir, &res->cinfo);
2505         nfs_post_op_update_inode(dir, &res->dir_attr);
2506         return 1;
2507 }
2508
2509 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2510                 struct inode *new_dir, struct qstr *new_name)
2511 {
2512         struct nfs_server *server = NFS_SERVER(old_dir);
2513         struct nfs4_rename_arg arg = {
2514                 .old_dir = NFS_FH(old_dir),
2515                 .new_dir = NFS_FH(new_dir),
2516                 .old_name = old_name,
2517                 .new_name = new_name,
2518                 .bitmask = server->attr_bitmask,
2519         };
2520         struct nfs_fattr old_fattr, new_fattr;
2521         struct nfs4_rename_res res = {
2522                 .server = server,
2523                 .old_fattr = &old_fattr,
2524                 .new_fattr = &new_fattr,
2525         };
2526         struct rpc_message msg = {
2527                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2528                 .rpc_argp = &arg,
2529                 .rpc_resp = &res,
2530         };
2531         int                     status;
2532
2533         nfs_fattr_init(res.old_fattr);
2534         nfs_fattr_init(res.new_fattr);
2535         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2536
2537         if (!status) {
2538                 update_changeattr(old_dir, &res.old_cinfo);
2539                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2540                 update_changeattr(new_dir, &res.new_cinfo);
2541                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2542         }
2543         return status;
2544 }
2545
2546 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2547                 struct inode *new_dir, struct qstr *new_name)
2548 {
2549         struct nfs4_exception exception = { };
2550         int err;
2551         do {
2552                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2553                                 _nfs4_proc_rename(old_dir, old_name,
2554                                         new_dir, new_name),
2555                                 &exception);
2556         } while (exception.retry);
2557         return err;
2558 }
2559
2560 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2561 {
2562         struct nfs_server *server = NFS_SERVER(inode);
2563         struct nfs4_link_arg arg = {
2564                 .fh     = NFS_FH(inode),
2565                 .dir_fh = NFS_FH(dir),
2566                 .name   = name,
2567                 .bitmask = server->attr_bitmask,
2568         };
2569         struct nfs_fattr fattr, dir_attr;
2570         struct nfs4_link_res res = {
2571                 .server = server,
2572                 .fattr = &fattr,
2573                 .dir_attr = &dir_attr,
2574         };
2575         struct rpc_message msg = {
2576                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2577                 .rpc_argp = &arg,
2578                 .rpc_resp = &res,
2579         };
2580         int                     status;
2581
2582         nfs_fattr_init(res.fattr);
2583         nfs_fattr_init(res.dir_attr);
2584         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2585         if (!status) {
2586                 update_changeattr(dir, &res.cinfo);
2587                 nfs_post_op_update_inode(dir, res.dir_attr);
2588                 nfs_post_op_update_inode(inode, res.fattr);
2589         }
2590
2591         return status;
2592 }
2593
2594 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2595 {
2596         struct nfs4_exception exception = { };
2597         int err;
2598         do {
2599                 err = nfs4_handle_exception(NFS_SERVER(inode),
2600                                 _nfs4_proc_link(inode, dir, name),
2601                                 &exception);
2602         } while (exception.retry);
2603         return err;
2604 }
2605
2606 struct nfs4_createdata {
2607         struct rpc_message msg;
2608         struct nfs4_create_arg arg;
2609         struct nfs4_create_res res;
2610         struct nfs_fh fh;
2611         struct nfs_fattr fattr;
2612         struct nfs_fattr dir_fattr;
2613 };
2614
2615 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2616                 struct qstr *name, struct iattr *sattr, u32 ftype)
2617 {
2618         struct nfs4_createdata *data;
2619
2620         data = kzalloc(sizeof(*data), GFP_KERNEL);
2621         if (data != NULL) {
2622                 struct nfs_server *server = NFS_SERVER(dir);
2623
2624                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2625                 data->msg.rpc_argp = &data->arg;
2626                 data->msg.rpc_resp = &data->res;
2627                 data->arg.dir_fh = NFS_FH(dir);
2628                 data->arg.server = server;
2629                 data->arg.name = name;
2630                 data->arg.attrs = sattr;
2631                 data->arg.ftype = ftype;
2632                 data->arg.bitmask = server->attr_bitmask;
2633                 data->res.server = server;
2634                 data->res.fh = &data->fh;
2635                 data->res.fattr = &data->fattr;
2636                 data->res.dir_fattr = &data->dir_fattr;
2637                 nfs_fattr_init(data->res.fattr);
2638                 nfs_fattr_init(data->res.dir_fattr);
2639         }
2640         return data;
2641 }
2642
2643 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2644 {
2645         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2646                                     &data->arg, &data->res, 1);
2647         if (status == 0) {
2648                 update_changeattr(dir, &data->res.dir_cinfo);
2649                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2650                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2651         }
2652         return status;
2653 }
2654
2655 static void nfs4_free_createdata(struct nfs4_createdata *data)
2656 {
2657         kfree(data);
2658 }
2659
2660 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2661                 struct page *page, unsigned int len, struct iattr *sattr)
2662 {
2663         struct nfs4_createdata *data;
2664         int status = -ENAMETOOLONG;
2665
2666         if (len > NFS4_MAXPATHLEN)
2667                 goto out;
2668
2669         status = -ENOMEM;
2670         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2671         if (data == NULL)
2672                 goto out;
2673
2674         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2675         data->arg.u.symlink.pages = &page;
2676         data->arg.u.symlink.len = len;
2677
2678         status = nfs4_do_create(dir, dentry, data);
2679
2680         nfs4_free_createdata(data);
2681 out:
2682         return status;
2683 }
2684
2685 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2686                 struct page *page, unsigned int len, struct iattr *sattr)
2687 {
2688         struct nfs4_exception exception = { };
2689         int err;
2690         do {
2691                 err = nfs4_handle_exception(NFS_SERVER(dir),
2692                                 _nfs4_proc_symlink(dir, dentry, page,
2693                                                         len, sattr),
2694                                 &exception);
2695         } while (exception.retry);
2696         return err;
2697 }
2698
2699 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2700                 struct iattr *sattr)
2701 {
2702         struct nfs4_createdata *data;
2703         int status = -ENOMEM;
2704
2705         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2706         if (data == NULL)
2707                 goto out;
2708
2709         status = nfs4_do_create(dir, dentry, data);
2710
2711         nfs4_free_createdata(data);
2712 out:
2713         return status;
2714 }
2715
2716 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2717                 struct iattr *sattr)
2718 {
2719         struct nfs4_exception exception = { };
2720         int err;
2721         do {
2722                 err = nfs4_handle_exception(NFS_SERVER(dir),
2723                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2724                                 &exception);
2725         } while (exception.retry);
2726         return err;
2727 }
2728
2729 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2730                   u64 cookie, struct page *page, unsigned int count, int plus)
2731 {
2732         struct inode            *dir = dentry->d_inode;
2733         struct nfs4_readdir_arg args = {
2734                 .fh = NFS_FH(dir),
2735                 .pages = &page,
2736                 .pgbase = 0,
2737                 .count = count,
2738                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2739         };
2740         struct nfs4_readdir_res res;
2741         struct rpc_message msg = {
2742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2743                 .rpc_argp = &args,
2744                 .rpc_resp = &res,
2745                 .rpc_cred = cred,
2746         };
2747         int                     status;
2748
2749         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2750                         dentry->d_parent->d_name.name,
2751                         dentry->d_name.name,
2752                         (unsigned long long)cookie);
2753         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2754         res.pgbase = args.pgbase;
2755         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2756         if (status == 0)
2757                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2758
2759         nfs_invalidate_atime(dir);
2760
2761         dprintk("%s: returns %d\n", __func__, status);
2762         return status;
2763 }
2764
2765 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2766                   u64 cookie, struct page *page, unsigned int count, int plus)
2767 {
2768         struct nfs4_exception exception = { };
2769         int err;
2770         do {
2771                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2772                                 _nfs4_proc_readdir(dentry, cred, cookie,
2773                                         page, count, plus),
2774                                 &exception);
2775         } while (exception.retry);
2776         return err;
2777 }
2778
2779 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2780                 struct iattr *sattr, dev_t rdev)
2781 {
2782         struct nfs4_createdata *data;
2783         int mode = sattr->ia_mode;
2784         int status = -ENOMEM;
2785
2786         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2787         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2788
2789         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2790         if (data == NULL)
2791                 goto out;
2792
2793         if (S_ISFIFO(mode))
2794                 data->arg.ftype = NF4FIFO;
2795         else if (S_ISBLK(mode)) {
2796                 data->arg.ftype = NF4BLK;
2797                 data->arg.u.device.specdata1 = MAJOR(rdev);
2798                 data->arg.u.device.specdata2 = MINOR(rdev);
2799         }
2800         else if (S_ISCHR(mode)) {
2801                 data->arg.ftype = NF4CHR;
2802                 data->arg.u.device.specdata1 = MAJOR(rdev);
2803                 data->arg.u.device.specdata2 = MINOR(rdev);
2804         }
2805
2806         status = nfs4_do_create(dir, dentry, data);
2807
2808         nfs4_free_createdata(data);
2809 out:
2810         return status;
2811 }
2812
2813 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2814                 struct iattr *sattr, dev_t rdev)
2815 {
2816         struct nfs4_exception exception = { };
2817         int err;
2818         do {
2819                 err = nfs4_handle_exception(NFS_SERVER(dir),
2820                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2821                                 &exception);
2822         } while (exception.retry);
2823         return err;
2824 }
2825
2826 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2827                  struct nfs_fsstat *fsstat)
2828 {
2829         struct nfs4_statfs_arg args = {
2830                 .fh = fhandle,
2831                 .bitmask = server->attr_bitmask,
2832         };
2833         struct nfs4_statfs_res res = {
2834                 .fsstat = fsstat,
2835         };
2836         struct rpc_message msg = {
2837                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2838                 .rpc_argp = &args,
2839                 .rpc_resp = &res,
2840         };
2841
2842         nfs_fattr_init(fsstat->fattr);
2843         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2844 }
2845
2846 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2847 {
2848         struct nfs4_exception exception = { };
2849         int err;
2850         do {
2851                 err = nfs4_handle_exception(server,
2852                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2853                                 &exception);
2854         } while (exception.retry);
2855         return err;
2856 }
2857
2858 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2859                 struct nfs_fsinfo *fsinfo)
2860 {
2861         struct nfs4_fsinfo_arg args = {
2862                 .fh = fhandle,
2863                 .bitmask = server->attr_bitmask,
2864         };
2865         struct nfs4_fsinfo_res res = {
2866                 .fsinfo = fsinfo,
2867         };
2868         struct rpc_message msg = {
2869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2870                 .rpc_argp = &args,
2871                 .rpc_resp = &res,
2872         };
2873
2874         return nfs4_call_sync(server, &msg, &args, &res, 0);
2875 }
2876
2877 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2878 {
2879         struct nfs4_exception exception = { };
2880         int err;
2881
2882         do {
2883                 err = nfs4_handle_exception(server,
2884                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2885                                 &exception);
2886         } while (exception.retry);
2887         return err;
2888 }
2889
2890 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2891 {
2892         nfs_fattr_init(fsinfo->fattr);
2893         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2894 }
2895
2896 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2897                 struct nfs_pathconf *pathconf)
2898 {
2899         struct nfs4_pathconf_arg args = {
2900                 .fh = fhandle,
2901                 .bitmask = server->attr_bitmask,
2902         };
2903         struct nfs4_pathconf_res res = {
2904                 .pathconf = pathconf,
2905         };
2906         struct rpc_message msg = {
2907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2908                 .rpc_argp = &args,
2909                 .rpc_resp = &res,
2910         };
2911
2912         /* None of the pathconf attributes are mandatory to implement */
2913         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2914                 memset(pathconf, 0, sizeof(*pathconf));
2915                 return 0;
2916         }
2917
2918         nfs_fattr_init(pathconf->fattr);
2919         return nfs4_call_sync(server, &msg, &args, &res, 0);
2920 }
2921
2922 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2923                 struct nfs_pathconf *pathconf)
2924 {
2925         struct nfs4_exception exception = { };
2926         int err;
2927
2928         do {
2929                 err = nfs4_handle_exception(server,
2930                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2931                                 &exception);
2932         } while (exception.retry);
2933         return err;
2934 }
2935
2936 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2937 {
2938         struct nfs_server *server = NFS_SERVER(data->inode);
2939
2940         dprintk("--> %s\n", __func__);
2941
2942         /* nfs4_sequence_free_slot called in the read rpc_call_done */
2943         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2944
2945         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2946                 nfs4_restart_rpc(task, server->nfs_client);
2947                 return -EAGAIN;
2948         }
2949
2950         nfs_invalidate_atime(data->inode);
2951         if (task->tk_status > 0)
2952                 renew_lease(server, data->timestamp);
2953         return 0;
2954 }
2955
2956 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2957 {
2958         data->timestamp   = jiffies;
2959         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2960 }
2961
2962 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2963 {
2964         struct inode *inode = data->inode;
2965
2966         /* slot is freed in nfs_writeback_done */
2967         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2968                            task->tk_status);
2969
2970         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2971                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
2972                 return -EAGAIN;
2973         }
2974         if (task->tk_status >= 0) {
2975                 renew_lease(NFS_SERVER(inode), data->timestamp);
2976                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2977         }
2978         return 0;
2979 }
2980
2981 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2982 {
2983         struct nfs_server *server = NFS_SERVER(data->inode);
2984
2985         data->args.bitmask = server->cache_consistency_bitmask;
2986         data->res.server = server;
2987         data->timestamp   = jiffies;
2988
2989         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2990 }
2991
2992 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2993 {
2994         struct inode *inode = data->inode;
2995
2996         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2997                            task->tk_status);
2998         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2999                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3000                 return -EAGAIN;
3001         }
3002         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
3003                                 &data->res.seq_res);
3004         nfs_refresh_inode(inode, data->res.fattr);
3005         return 0;
3006 }
3007
3008 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3009 {
3010         struct nfs_server *server = NFS_SERVER(data->inode);
3011
3012         data->args.bitmask = server->cache_consistency_bitmask;
3013         data->res.server = server;
3014         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3015 }
3016
3017 /*
3018  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3019  * standalone procedure for queueing an asynchronous RENEW.
3020  */
3021 static void nfs4_renew_done(struct rpc_task *task, void *data)
3022 {
3023         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3024         unsigned long timestamp = (unsigned long)data;
3025
3026         if (task->tk_status < 0) {
3027                 /* Unless we're shutting down, schedule state recovery! */
3028                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3029                         nfs4_schedule_state_recovery(clp);
3030                 return;
3031         }
3032         spin_lock(&clp->cl_lock);
3033         if (time_before(clp->cl_last_renewal,timestamp))
3034                 clp->cl_last_renewal = timestamp;
3035         spin_unlock(&clp->cl_lock);
3036         dprintk("%s calling put_rpccred on rpc_cred %p\n", __func__,
3037                                 task->tk_msg.rpc_cred);
3038         put_rpccred(task->tk_msg.rpc_cred);
3039 }
3040
3041 static const struct rpc_call_ops nfs4_renew_ops = {
3042         .rpc_call_done = nfs4_renew_done,
3043 };
3044
3045 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3046 {
3047         struct rpc_message msg = {
3048                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3049                 .rpc_argp       = clp,
3050                 .rpc_cred       = cred,
3051         };
3052
3053         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3054                         &nfs4_renew_ops, (void *)jiffies);
3055 }
3056
3057 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3058 {
3059         struct rpc_message msg = {
3060                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3061                 .rpc_argp       = clp,
3062                 .rpc_cred       = cred,
3063         };
3064         unsigned long now = jiffies;
3065         int status;
3066
3067         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3068         if (status < 0)
3069                 return status;
3070         spin_lock(&clp->cl_lock);
3071         if (time_before(clp->cl_last_renewal,now))
3072                 clp->cl_last_renewal = now;
3073         spin_unlock(&clp->cl_lock);
3074         return 0;
3075 }
3076
3077 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3078 {
3079         return (server->caps & NFS_CAP_ACLS)
3080                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3081                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3082 }
3083
3084 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3085  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3086  * the stack.
3087  */
3088 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3089
3090 static void buf_to_pages(const void *buf, size_t buflen,
3091                 struct page **pages, unsigned int *pgbase)
3092 {
3093         const void *p = buf;
3094
3095         *pgbase = offset_in_page(buf);
3096         p -= *pgbase;
3097         while (p < buf + buflen) {
3098                 *(pages++) = virt_to_page(p);
3099                 p += PAGE_CACHE_SIZE;
3100         }
3101 }
3102
3103 struct nfs4_cached_acl {
3104         int cached;
3105         size_t len;
3106         char data[0];
3107 };
3108
3109 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3110 {
3111         struct nfs_inode *nfsi = NFS_I(inode);
3112
3113         spin_lock(&inode->i_lock);
3114         kfree(nfsi->nfs4_acl);
3115         nfsi->nfs4_acl = acl;
3116         spin_unlock(&inode->i_lock);
3117 }
3118
3119 static void nfs4_zap_acl_attr(struct inode *inode)
3120 {
3121         nfs4_set_cached_acl(inode, NULL);
3122 }
3123
3124 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3125 {
3126         struct nfs_inode *nfsi = NFS_I(inode);
3127         struct nfs4_cached_acl *acl;
3128         int ret = -ENOENT;
3129
3130         spin_lock(&inode->i_lock);
3131         acl = nfsi->nfs4_acl;
3132         if (acl == NULL)
3133                 goto out;
3134         if (buf == NULL) /* user is just asking for length */
3135                 goto out_len;
3136         if (acl->cached == 0)
3137                 goto out;
3138         ret = -ERANGE; /* see getxattr(2) man page */
3139         if (acl->len > buflen)
3140                 goto out;
3141         memcpy(buf, acl->data, acl->len);
3142 out_len:
3143         ret = acl->len;
3144 out:
3145         spin_unlock(&inode->i_lock);
3146         return ret;
3147 }
3148
3149 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3150 {
3151         struct nfs4_cached_acl *acl;
3152
3153         if (buf && acl_len <= PAGE_SIZE) {
3154                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3155                 if (acl == NULL)
3156                         goto out;
3157                 acl->cached = 1;
3158                 memcpy(acl->data, buf, acl_len);
3159         } else {
3160                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3161                 if (acl == NULL)
3162                         goto out;
3163                 acl->cached = 0;
3164         }
3165         acl->len = acl_len;
3166 out:
3167         nfs4_set_cached_acl(inode, acl);
3168 }
3169
3170 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3171 {
3172         struct page *pages[NFS4ACL_MAXPAGES];
3173         struct nfs_getaclargs args = {
3174                 .fh = NFS_FH(inode),
3175                 .acl_pages = pages,
3176                 .acl_len = buflen,
3177         };
3178         struct nfs_getaclres res = {
3179                 .acl_len = buflen,
3180         };
3181         void *resp_buf;
3182         struct rpc_message msg = {
3183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3184                 .rpc_argp = &args,
3185                 .rpc_resp = &res,
3186         };
3187         struct page *localpage = NULL;
3188         int ret;
3189
3190         if (buflen < PAGE_SIZE) {
3191                 /* As long as we're doing a round trip to the server anyway,
3192                  * let's be prepared for a page of acl data. */
3193                 localpage = alloc_page(GFP_KERNEL);
3194                 resp_buf = page_address(localpage);
3195                 if (localpage == NULL)
3196                         return -ENOMEM;
3197                 args.acl_pages[0] = localpage;
3198                 args.acl_pgbase = 0;
3199                 args.acl_len = PAGE_SIZE;
3200         } else {
3201                 resp_buf = buf;
3202                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3203         }
3204         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3205         if (ret)
3206                 goto out_free;
3207         if (res.acl_len > args.acl_len)
3208                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3209         else
3210                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3211         if (buf) {
3212                 ret = -ERANGE;
3213                 if (res.acl_len > buflen)
3214                         goto out_free;
3215                 if (localpage)
3216                         memcpy(buf, resp_buf, res.acl_len);
3217         }
3218         ret = res.acl_len;
3219 out_free:
3220         if (localpage)
3221                 __free_page(localpage);
3222         return ret;
3223 }
3224
3225 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3226 {
3227         struct nfs4_exception exception = { };
3228         ssize_t ret;
3229         do {
3230                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3231                 if (ret >= 0)
3232                         break;
3233                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3234         } while (exception.retry);
3235         return ret;
3236 }
3237
3238 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3239 {
3240         struct nfs_server *server = NFS_SERVER(inode);
3241         int ret;
3242
3243         if (!nfs4_server_supports_acls(server))
3244                 return -EOPNOTSUPP;
3245         ret = nfs_revalidate_inode(server, inode);
3246         if (ret < 0)
3247                 return ret;
3248         ret = nfs4_read_cached_acl(inode, buf, buflen);
3249         if (ret != -ENOENT)
3250                 return ret;
3251         return nfs4_get_acl_uncached(inode, buf, buflen);
3252 }
3253
3254 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3255 {
3256         struct nfs_server *server = NFS_SERVER(inode);
3257         struct page *pages[NFS4ACL_MAXPAGES];
3258         struct nfs_setaclargs arg = {
3259                 .fh             = NFS_FH(inode),
3260                 .acl_pages      = pages,
3261                 .acl_len        = buflen,
3262         };
3263         struct nfs_setaclres res;
3264         struct rpc_message msg = {
3265                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3266                 .rpc_argp       = &arg,
3267                 .rpc_resp       = &res,
3268         };
3269         int ret;
3270
3271         if (!nfs4_server_supports_acls(server))
3272                 return -EOPNOTSUPP;
3273         nfs_inode_return_delegation(inode);
3274         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3275         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3276         nfs_access_zap_cache(inode);
3277         nfs_zap_acl_cache(inode);
3278         return ret;
3279 }
3280
3281 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3282 {
3283         struct nfs4_exception exception = { };
3284         int err;
3285         do {
3286                 err = nfs4_handle_exception(NFS_SERVER(inode),
3287                                 __nfs4_proc_set_acl(inode, buf, buflen),
3288                                 &exception);
3289         } while (exception.retry);
3290         return err;
3291 }
3292
3293 static int
3294 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3295 {
3296         if (!clp || task->tk_status >= 0)
3297                 return 0;
3298         switch(task->tk_status) {
3299                 case -NFS4ERR_ADMIN_REVOKED:
3300                 case -NFS4ERR_BAD_STATEID:
3301                 case -NFS4ERR_OPENMODE:
3302                         if (state == NULL)
3303                                 break;
3304                         nfs4_state_mark_reclaim_nograce(clp, state);
3305                 case -NFS4ERR_STALE_CLIENTID:
3306                 case -NFS4ERR_STALE_STATEID:
3307                 case -NFS4ERR_EXPIRED:
3308                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3309                         nfs4_schedule_state_recovery(clp);
3310                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3311                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3312                         task->tk_status = 0;
3313                         return -EAGAIN;
3314 #if defined(CONFIG_NFS_V4_1)
3315                 case -NFS4ERR_BADSESSION:
3316                 case -NFS4ERR_BADSLOT:
3317                 case -NFS4ERR_BAD_HIGH_SLOT:
3318                 case -NFS4ERR_DEADSESSION:
3319                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3320                 case -NFS4ERR_SEQ_FALSE_RETRY:
3321                 case -NFS4ERR_SEQ_MISORDERED:
3322                         dprintk("%s ERROR %d, Reset session\n", __func__,
3323                                 task->tk_status);
3324                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
3325                         task->tk_status = 0;
3326                         return -EAGAIN;
3327 #endif /* CONFIG_NFS_V4_1 */
3328                 case -NFS4ERR_DELAY:
3329                         if (server)
3330                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3331                 case -NFS4ERR_GRACE:
3332                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3333                         task->tk_status = 0;
3334                         return -EAGAIN;
3335                 case -NFS4ERR_OLD_STATEID:
3336                         task->tk_status = 0;
3337                         return -EAGAIN;
3338         }
3339         task->tk_status = nfs4_map_errors(task->tk_status);
3340         return 0;
3341 }
3342
3343 static int
3344 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3345 {
3346         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3347 }
3348
3349 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3350 {
3351         nfs4_verifier sc_verifier;
3352         struct nfs4_setclientid setclientid = {
3353                 .sc_verifier = &sc_verifier,
3354                 .sc_prog = program,
3355         };
3356         struct rpc_message msg = {
3357                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3358                 .rpc_argp = &setclientid,
3359                 .rpc_resp = clp,
3360                 .rpc_cred = cred,
3361         };
3362         __be32 *p;
3363         int loop = 0;
3364         int status;
3365
3366         p = (__be32*)sc_verifier.data;
3367         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3368         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3369
3370         for(;;) {
3371                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3372                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3373                                 clp->cl_ipaddr,
3374                                 rpc_peeraddr2str(clp->cl_rpcclient,
3375                                                         RPC_DISPLAY_ADDR),
3376                                 rpc_peeraddr2str(clp->cl_rpcclient,
3377                                                         RPC_DISPLAY_PROTO),
3378                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3379                                 clp->cl_id_uniquifier);
3380                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3381                                 sizeof(setclientid.sc_netid),
3382                                 rpc_peeraddr2str(clp->cl_rpcclient,
3383                                                         RPC_DISPLAY_NETID));
3384                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3385                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3386                                 clp->cl_ipaddr, port >> 8, port & 255);
3387
3388                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3389                 if (status != -NFS4ERR_CLID_INUSE)
3390                         break;
3391                 if (signalled())
3392                         break;
3393                 if (loop++ & 1)
3394                         ssleep(clp->cl_lease_time + 1);
3395                 else
3396                         if (++clp->cl_id_uniquifier == 0)
3397                                 break;
3398         }
3399         return status;
3400 }
3401
3402 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3403 {
3404         struct nfs_fsinfo fsinfo;
3405         struct rpc_message msg = {
3406                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3407                 .rpc_argp = clp,
3408                 .rpc_resp = &fsinfo,
3409                 .rpc_cred = cred,
3410         };
3411         unsigned long now;
3412         int status;
3413
3414         now = jiffies;
3415         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3416         if (status == 0) {
3417                 spin_lock(&clp->cl_lock);
3418                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3419                 clp->cl_last_renewal = now;
3420                 spin_unlock(&clp->cl_lock);
3421         }
3422         return status;
3423 }
3424
3425 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3426 {
3427         long timeout = 0;
3428         int err;
3429         do {
3430                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3431                 switch (err) {
3432                         case 0:
3433                                 return err;
3434                         case -NFS4ERR_RESOURCE:
3435                                 /* The IBM lawyers misread another document! */
3436                         case -NFS4ERR_DELAY:
3437                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3438                 }
3439         } while (err == 0);
3440         return err;
3441 }
3442
3443 struct nfs4_delegreturndata {
3444         struct nfs4_delegreturnargs args;
3445         struct nfs4_delegreturnres res;
3446         struct nfs_fh fh;
3447         nfs4_stateid stateid;
3448         unsigned long timestamp;
3449         struct nfs_fattr fattr;
3450         int rpc_status;
3451 };
3452
3453 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3454 {
3455         struct nfs4_delegreturndata *data = calldata;
3456
3457         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3458                                      task->tk_status);
3459
3460         data->rpc_status = task->tk_status;
3461         if (data->rpc_status == 0)
3462                 renew_lease(data->res.server, data->timestamp);
3463 }
3464
3465 static void nfs4_delegreturn_release(void *calldata)
3466 {
3467         kfree(calldata);
3468 }
3469
3470 #if defined(CONFIG_NFS_V4_1)
3471 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3472 {
3473         struct nfs4_delegreturndata *d_data;
3474
3475         d_data = (struct nfs4_delegreturndata *)data;
3476
3477         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3478                                 &d_data->args.seq_args,
3479                                 &d_data->res.seq_res, 1, task))
3480                 return;
3481         rpc_call_start(task);
3482 }
3483 #endif /* CONFIG_NFS_V4_1 */
3484
3485 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3486 #if defined(CONFIG_NFS_V4_1)
3487         .rpc_call_prepare = nfs4_delegreturn_prepare,
3488 #endif /* CONFIG_NFS_V4_1 */
3489         .rpc_call_done = nfs4_delegreturn_done,
3490         .rpc_release = nfs4_delegreturn_release,
3491 };
3492
3493 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3494 {
3495         struct nfs4_delegreturndata *data;
3496         struct nfs_server *server = NFS_SERVER(inode);
3497         struct rpc_task *task;
3498         struct rpc_message msg = {
3499                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3500                 .rpc_cred = cred,
3501         };
3502         struct rpc_task_setup task_setup_data = {
3503                 .rpc_client = server->client,
3504                 .rpc_message = &msg,
3505                 .callback_ops = &nfs4_delegreturn_ops,
3506                 .flags = RPC_TASK_ASYNC,
3507         };
3508         int status = 0;
3509
3510         data = kzalloc(sizeof(*data), GFP_KERNEL);
3511         if (data == NULL)
3512                 return -ENOMEM;
3513         data->args.fhandle = &data->fh;
3514         data->args.stateid = &data->stateid;
3515         data->args.bitmask = server->attr_bitmask;
3516         nfs_copy_fh(&data->fh, NFS_FH(inode));
3517         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3518         data->res.fattr = &data->fattr;
3519         data->res.server = server;
3520         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3521         nfs_fattr_init(data->res.fattr);
3522         data->timestamp = jiffies;
3523         data->rpc_status = 0;
3524
3525         task_setup_data.callback_data = data;
3526         msg.rpc_argp = &data->args,
3527         msg.rpc_resp = &data->res,
3528         task = rpc_run_task(&task_setup_data);
3529         if (IS_ERR(task))
3530                 return PTR_ERR(task);
3531         if (!issync)
3532                 goto out;
3533         status = nfs4_wait_for_completion_rpc_task(task);
3534         if (status != 0)
3535                 goto out;
3536         status = data->rpc_status;
3537         if (status != 0)
3538                 goto out;
3539         nfs_refresh_inode(inode, &data->fattr);
3540 out:
3541         rpc_put_task(task);
3542         return status;
3543 }
3544
3545 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3546 {
3547         struct nfs_server *server = NFS_SERVER(inode);
3548         struct nfs4_exception exception = { };
3549         int err;
3550         do {
3551                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3552                 switch (err) {
3553                         case -NFS4ERR_STALE_STATEID:
3554                         case -NFS4ERR_EXPIRED:
3555                         case 0:
3556                                 return 0;
3557                 }
3558                 err = nfs4_handle_exception(server, err, &exception);
3559         } while (exception.retry);
3560         return err;
3561 }
3562
3563 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3564 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3565
3566 /*
3567  * sleep, with exponential backoff, and retry the LOCK operation.
3568  */
3569 static unsigned long
3570 nfs4_set_lock_task_retry(unsigned long timeout)
3571 {
3572         schedule_timeout_killable(timeout);
3573         timeout <<= 1;
3574         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3575                 return NFS4_LOCK_MAXTIMEOUT;
3576         return timeout;
3577 }
3578
3579 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3580 {
3581         struct inode *inode = state->inode;
3582         struct nfs_server *server = NFS_SERVER(inode);
3583         struct nfs_client *clp = server->nfs_client;
3584         struct nfs_lockt_args arg = {
3585                 .fh = NFS_FH(inode),
3586                 .fl = request,
3587         };
3588         struct nfs_lockt_res res = {
3589                 .denied = request,
3590         };
3591         struct rpc_message msg = {
3592                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3593                 .rpc_argp       = &arg,
3594                 .rpc_resp       = &res,
3595                 .rpc_cred       = state->owner->so_cred,
3596         };
3597         struct nfs4_lock_state *lsp;
3598         int status;
3599
3600         arg.lock_owner.clientid = clp->cl_clientid;
3601         status = nfs4_set_lock_state(state, request);
3602         if (status != 0)
3603                 goto out;
3604         lsp = request->fl_u.nfs4_fl.owner;
3605         arg.lock_owner.id = lsp->ls_id.id;
3606         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3607         switch (status) {
3608                 case 0:
3609                         request->fl_type = F_UNLCK;
3610                         break;
3611                 case -NFS4ERR_DENIED:
3612                         status = 0;
3613         }
3614         request->fl_ops->fl_release_private(request);
3615 out:
3616         return status;
3617 }
3618
3619 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3620 {
3621         struct nfs4_exception exception = { };
3622         int err;
3623
3624         do {
3625                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3626                                 _nfs4_proc_getlk(state, cmd, request),
3627                                 &exception);
3628         } while (exception.retry);
3629         return err;
3630 }
3631
3632 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3633 {
3634         int res = 0;
3635         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3636                 case FL_POSIX:
3637                         res = posix_lock_file_wait(file, fl);
3638                         break;
3639                 case FL_FLOCK:
3640                         res = flock_lock_file_wait(file, fl);
3641                         break;
3642                 default:
3643                         BUG();
3644         }
3645         return res;
3646 }
3647
3648 struct nfs4_unlockdata {
3649         struct nfs_locku_args arg;
3650         struct nfs_locku_res res;
3651         struct nfs4_lock_state *lsp;
3652         struct nfs_open_context *ctx;
3653         struct file_lock fl;
3654         const struct nfs_server *server;
3655         unsigned long timestamp;
3656 };
3657
3658 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3659                 struct nfs_open_context *ctx,
3660                 struct nfs4_lock_state *lsp,
3661                 struct nfs_seqid *seqid)
3662 {
3663         struct nfs4_unlockdata *p;
3664         struct inode *inode = lsp->ls_state->inode;
3665
3666         p = kzalloc(sizeof(*p), GFP_KERNEL);
3667         if (p == NULL)
3668                 return NULL;
3669         p->arg.fh = NFS_FH(inode);
3670         p->arg.fl = &p->fl;
3671         p->arg.seqid = seqid;
3672         p->res.seqid = seqid;
3673         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3674         p->arg.stateid = &lsp->ls_stateid;
3675         p->lsp = lsp;
3676         atomic_inc(&lsp->ls_count);
3677         /* Ensure we don't close file until we're done freeing locks! */
3678         p->ctx = get_nfs_open_context(ctx);
3679         memcpy(&p->fl, fl, sizeof(p->fl));
3680         p->server = NFS_SERVER(inode);
3681         return p;
3682 }
3683
3684 static void nfs4_locku_release_calldata(void *data)
3685 {
3686         struct nfs4_unlockdata *calldata = data;
3687         nfs_free_seqid(calldata->arg.seqid);
3688         nfs4_put_lock_state(calldata->lsp);
3689         put_nfs_open_context(calldata->ctx);
3690         kfree(calldata);
3691 }
3692
3693 static void nfs4_locku_done(struct rpc_task *task, void *data)
3694 {
3695         struct nfs4_unlockdata *calldata = data;
3696
3697         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3698                            task->tk_status);
3699         if (RPC_ASSASSINATED(task))
3700                 return;
3701         switch (task->tk_status) {
3702                 case 0:
3703                         memcpy(calldata->lsp->ls_stateid.data,
3704                                         calldata->res.stateid.data,
3705                                         sizeof(calldata->lsp->ls_stateid.data));
3706                         renew_lease(calldata->server, calldata->timestamp);
3707                         break;
3708                 case -NFS4ERR_BAD_STATEID:
3709                 case -NFS4ERR_OLD_STATEID:
3710                 case -NFS4ERR_STALE_STATEID:
3711                 case -NFS4ERR_EXPIRED:
3712                         break;
3713                 default:
3714                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3715                                 nfs4_restart_rpc(task,
3716                                                 calldata->server->nfs_client);
3717         }
3718         nfs4_sequence_free_slot(calldata->server->nfs_client,
3719                                 &calldata->res.seq_res);
3720 }
3721
3722 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3723 {
3724         struct nfs4_unlockdata *calldata = data;
3725
3726         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3727                 return;
3728         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3729                 /* Note: exit _without_ running nfs4_locku_done */
3730                 task->tk_action = NULL;
3731                 return;
3732         }
3733         calldata->timestamp = jiffies;
3734         if (nfs4_setup_sequence(calldata->server->nfs_client,
3735                                 &calldata->arg.seq_args,
3736                                 &calldata->res.seq_res, 1, task))
3737                 return;
3738         rpc_call_start(task);
3739 }
3740
3741 static const struct rpc_call_ops nfs4_locku_ops = {
3742         .rpc_call_prepare = nfs4_locku_prepare,
3743         .rpc_call_done = nfs4_locku_done,
3744         .rpc_release = nfs4_locku_release_calldata,
3745 };
3746
3747 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3748                 struct nfs_open_context *ctx,
3749                 struct nfs4_lock_state *lsp,
3750                 struct nfs_seqid *seqid)
3751 {
3752         struct nfs4_unlockdata *data;
3753         struct rpc_message msg = {
3754                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3755                 .rpc_cred = ctx->cred,
3756         };
3757         struct rpc_task_setup task_setup_data = {
3758                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3759                 .rpc_message = &msg,
3760                 .callback_ops = &nfs4_locku_ops,
3761                 .workqueue = nfsiod_workqueue,
3762                 .flags = RPC_TASK_ASYNC,
3763         };
3764
3765         /* Ensure this is an unlock - when canceling a lock, the
3766          * canceled lock is passed in, and it won't be an unlock.
3767          */
3768         fl->fl_type = F_UNLCK;
3769
3770         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3771         if (data == NULL) {
3772                 nfs_free_seqid(seqid);
3773                 return ERR_PTR(-ENOMEM);
3774         }
3775
3776         msg.rpc_argp = &data->arg,
3777         msg.rpc_resp = &data->res,
3778         task_setup_data.callback_data = data;
3779         return rpc_run_task(&task_setup_data);
3780 }
3781
3782 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3783 {
3784         struct nfs_inode *nfsi = NFS_I(state->inode);
3785         struct nfs_seqid *seqid;
3786         struct nfs4_lock_state *lsp;
3787         struct rpc_task *task;
3788         int status = 0;
3789         unsigned char fl_flags = request->fl_flags;
3790
3791         status = nfs4_set_lock_state(state, request);
3792         /* Unlock _before_ we do the RPC call */
3793         request->fl_flags |= FL_EXISTS;
3794         down_read(&nfsi->rwsem);
3795         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3796                 up_read(&nfsi->rwsem);
3797                 goto out;
3798         }
3799         up_read(&nfsi->rwsem);
3800         if (status != 0)
3801                 goto out;
3802         /* Is this a delegated lock? */
3803         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3804                 goto out;
3805         lsp = request->fl_u.nfs4_fl.owner;
3806         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3807         status = -ENOMEM;
3808         if (seqid == NULL)
3809                 goto out;
3810         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3811         status = PTR_ERR(task);
3812         if (IS_ERR(task))
3813                 goto out;
3814         status = nfs4_wait_for_completion_rpc_task(task);
3815         rpc_put_task(task);
3816 out:
3817         request->fl_flags = fl_flags;
3818         return status;
3819 }
3820
3821 struct nfs4_lockdata {
3822         struct nfs_lock_args arg;
3823         struct nfs_lock_res res;
3824         struct nfs4_lock_state *lsp;
3825         struct nfs_open_context *ctx;
3826         struct file_lock fl;
3827         unsigned long timestamp;
3828         int rpc_status;
3829         int cancelled;
3830         struct nfs_server *server;
3831 };
3832
3833 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3834                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3835 {
3836         struct nfs4_lockdata *p;
3837         struct inode *inode = lsp->ls_state->inode;
3838         struct nfs_server *server = NFS_SERVER(inode);
3839
3840         p = kzalloc(sizeof(*p), GFP_KERNEL);
3841         if (p == NULL)
3842                 return NULL;
3843
3844         p->arg.fh = NFS_FH(inode);
3845         p->arg.fl = &p->fl;
3846         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3847         if (p->arg.open_seqid == NULL)
3848                 goto out_free;
3849         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3850         if (p->arg.lock_seqid == NULL)
3851                 goto out_free_seqid;
3852         p->arg.lock_stateid = &lsp->ls_stateid;
3853         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3854         p->arg.lock_owner.id = lsp->ls_id.id;
3855         p->res.lock_seqid = p->arg.lock_seqid;
3856         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3857         p->lsp = lsp;
3858         p->server = server;
3859         atomic_inc(&lsp->ls_count);
3860         p->ctx = get_nfs_open_context(ctx);
3861         memcpy(&p->fl, fl, sizeof(p->fl));
3862         return p;
3863 out_free_seqid:
3864         nfs_free_seqid(p->arg.open_seqid);
3865 out_free:
3866         kfree(p);
3867         return NULL;
3868 }
3869
3870 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3871 {
3872         struct nfs4_lockdata *data = calldata;
3873         struct nfs4_state *state = data->lsp->ls_state;
3874
3875         dprintk("%s: begin!\n", __func__);
3876         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3877                 return;
3878         /* Do we need to do an open_to_lock_owner? */
3879         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3880                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3881                         return;
3882                 data->arg.open_stateid = &state->stateid;
3883                 data->arg.new_lock_owner = 1;
3884                 data->res.open_seqid = data->arg.open_seqid;
3885         } else
3886                 data->arg.new_lock_owner = 0;
3887         data->timestamp = jiffies;
3888         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3889                                 &data->res.seq_res, 1, task))
3890                 return;
3891         rpc_call_start(task);
3892         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3893 }
3894
3895 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3896 {
3897         struct nfs4_lockdata *data = calldata;
3898
3899         dprintk("%s: begin!\n", __func__);
3900
3901         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3902                                      task->tk_status);
3903
3904         data->rpc_status = task->tk_status;
3905         if (RPC_ASSASSINATED(task))
3906                 goto out;
3907         if (data->arg.new_lock_owner != 0) {
3908                 if (data->rpc_status == 0)
3909                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3910                 else
3911                         goto out;
3912         }
3913         if (data->rpc_status == 0) {
3914                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3915                                         sizeof(data->lsp->ls_stateid.data));
3916                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3917                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3918         }
3919 out:
3920         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3921 }
3922
3923 static void nfs4_lock_release(void *calldata)
3924 {
3925         struct nfs4_lockdata *data = calldata;
3926
3927         dprintk("%s: begin!\n", __func__);
3928         nfs_free_seqid(data->arg.open_seqid);
3929         if (data->cancelled != 0) {
3930                 struct rpc_task *task;
3931                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3932                                 data->arg.lock_seqid);
3933                 if (!IS_ERR(task))
3934                         rpc_put_task(task);
3935                 dprintk("%s: cancelling lock!\n", __func__);
3936         } else
3937                 nfs_free_seqid(data->arg.lock_seqid);
3938         nfs4_put_lock_state(data->lsp);
3939         put_nfs_open_context(data->ctx);
3940         kfree(data);
3941         dprintk("%s: done!\n", __func__);
3942 }
3943
3944 static const struct rpc_call_ops nfs4_lock_ops = {
3945         .rpc_call_prepare = nfs4_lock_prepare,
3946         .rpc_call_done = nfs4_lock_done,
3947         .rpc_release = nfs4_lock_release,
3948 };
3949
3950 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3951 {
3952         struct nfs4_lockdata *data;
3953         struct rpc_task *task;
3954         struct rpc_message msg = {
3955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3956                 .rpc_cred = state->owner->so_cred,
3957         };
3958         struct rpc_task_setup task_setup_data = {
3959                 .rpc_client = NFS_CLIENT(state->inode),
3960                 .rpc_message = &msg,
3961                 .callback_ops = &nfs4_lock_ops,
3962                 .workqueue = nfsiod_workqueue,
3963                 .flags = RPC_TASK_ASYNC,
3964         };
3965         int ret;
3966
3967         dprintk("%s: begin!\n", __func__);
3968         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3969                         fl->fl_u.nfs4_fl.owner);
3970         if (data == NULL)
3971                 return -ENOMEM;
3972         if (IS_SETLKW(cmd))
3973                 data->arg.block = 1;
3974         if (reclaim != 0)
3975                 data->arg.reclaim = 1;
3976         msg.rpc_argp = &data->arg,
3977         msg.rpc_resp = &data->res,
3978         task_setup_data.callback_data = data;
3979         task = rpc_run_task(&task_setup_data);
3980         if (IS_ERR(task))
3981                 return PTR_ERR(task);
3982         ret = nfs4_wait_for_completion_rpc_task(task);
3983         if (ret == 0) {
3984                 ret = data->rpc_status;
3985         } else
3986                 data->cancelled = 1;
3987         rpc_put_task(task);
3988         dprintk("%s: done, ret = %d!\n", __func__, ret);
3989         return ret;
3990 }
3991
3992 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3993 {
3994         struct nfs_server *server = NFS_SERVER(state->inode);
3995         struct nfs4_exception exception = { };
3996         int err;
3997
3998         do {
3999                 /* Cache the lock if possible... */
4000                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4001                         return 0;
4002                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4003                 if (err != -NFS4ERR_DELAY)
4004                         break;
4005                 nfs4_handle_exception(server, err, &exception);
4006         } while (exception.retry);
4007         return err;
4008 }
4009
4010 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4011 {
4012         struct nfs_server *server = NFS_SERVER(state->inode);
4013         struct nfs4_exception exception = { };
4014         int err;
4015
4016         err = nfs4_set_lock_state(state, request);
4017         if (err != 0)
4018                 return err;
4019         do {
4020                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4021                         return 0;
4022                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4023                 if (err != -NFS4ERR_DELAY)
4024                         break;
4025                 nfs4_handle_exception(server, err, &exception);
4026         } while (exception.retry);
4027         return err;
4028 }
4029
4030 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4031 {
4032         struct nfs_inode *nfsi = NFS_I(state->inode);
4033         unsigned char fl_flags = request->fl_flags;
4034         int status;
4035
4036         /* Is this a delegated open? */
4037         status = nfs4_set_lock_state(state, request);
4038         if (status != 0)
4039                 goto out;
4040         request->fl_flags |= FL_ACCESS;
4041         status = do_vfs_lock(request->fl_file, request);
4042         if (status < 0)
4043                 goto out;
4044         down_read(&nfsi->rwsem);
4045         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4046                 /* Yes: cache locks! */
4047                 /* ...but avoid races with delegation recall... */
4048                 request->fl_flags = fl_flags & ~FL_SLEEP;
4049                 status = do_vfs_lock(request->fl_file, request);
4050                 goto out_unlock;
4051         }
4052         status = _nfs4_do_setlk(state, cmd, request, 0);
4053         if (status != 0)
4054                 goto out_unlock;
4055         /* Note: we always want to sleep here! */
4056         request->fl_flags = fl_flags | FL_SLEEP;
4057         if (do_vfs_lock(request->fl_file, request) < 0)
4058                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4059 out_unlock:
4060         up_read(&nfsi->rwsem);
4061 out:
4062         request->fl_flags = fl_flags;
4063         return status;
4064 }
4065
4066 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4067 {
4068         struct nfs4_exception exception = { };
4069         int err;
4070
4071         do {
4072                 err = _nfs4_proc_setlk(state, cmd, request);
4073                 if (err == -NFS4ERR_DENIED)
4074                         err = -EAGAIN;
4075                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4076                                 err, &exception);
4077         } while (exception.retry);
4078         return err;
4079 }
4080
4081 static int
4082 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4083 {
4084         struct nfs_open_context *ctx;
4085         struct nfs4_state *state;
4086         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4087         int status;
4088
4089         /* verify open state */
4090         ctx = nfs_file_open_context(filp);
4091         state = ctx->state;
4092
4093         if (request->fl_start < 0 || request->fl_end < 0)
4094                 return -EINVAL;
4095
4096         if (IS_GETLK(cmd)) {
4097                 if (state != NULL)
4098                         return nfs4_proc_getlk(state, F_GETLK, request);
4099                 return 0;
4100         }
4101
4102         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4103                 return -EINVAL;
4104
4105         if (request->fl_type == F_UNLCK) {
4106                 if (state != NULL)
4107                         return nfs4_proc_unlck(state, cmd, request);
4108                 return 0;
4109         }
4110
4111         if (state == NULL)
4112                 return -ENOLCK;
4113         do {
4114                 status = nfs4_proc_setlk(state, cmd, request);
4115                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4116                         break;
4117                 timeout = nfs4_set_lock_task_retry(timeout);
4118                 status = -ERESTARTSYS;
4119                 if (signalled())
4120                         break;
4121         } while(status < 0);
4122         return status;
4123 }
4124
4125 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4126 {
4127         struct nfs_server *server = NFS_SERVER(state->inode);
4128         struct nfs4_exception exception = { };
4129         int err;
4130
4131         err = nfs4_set_lock_state(state, fl);
4132         if (err != 0)
4133                 goto out;
4134         do {
4135                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4136                 switch (err) {
4137                         default:
4138                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4139                                                 __func__, err);
4140                         case 0:
4141                         case -ESTALE:
4142                                 goto out;
4143                         case -NFS4ERR_EXPIRED:
4144                         case -NFS4ERR_STALE_CLIENTID:
4145                         case -NFS4ERR_STALE_STATEID:
4146                                 nfs4_schedule_state_recovery(server->nfs_client);
4147                                 goto out;
4148                         case -ERESTARTSYS:
4149                                 /*
4150                                  * The show must go on: exit, but mark the
4151                                  * stateid as needing recovery.
4152                                  */
4153                         case -NFS4ERR_ADMIN_REVOKED:
4154                         case -NFS4ERR_BAD_STATEID:
4155                         case -NFS4ERR_OPENMODE:
4156                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4157                                 err = 0;
4158                                 goto out;
4159                         case -ENOMEM:
4160                         case -NFS4ERR_DENIED:
4161                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4162                                 err = 0;
4163                                 goto out;
4164                         case -NFS4ERR_DELAY:
4165                                 break;
4166                 }
4167                 err = nfs4_handle_exception(server, err, &exception);
4168         } while (exception.retry);
4169 out:
4170         return err;
4171 }
4172
4173 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4174
4175 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4176                 size_t buflen, int flags)
4177 {
4178         struct inode *inode = dentry->d_inode;
4179
4180         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4181                 return -EOPNOTSUPP;
4182
4183         return nfs4_proc_set_acl(inode, buf, buflen);
4184 }
4185
4186 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4187  * and that's what we'll do for e.g. user attributes that haven't been set.
4188  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4189  * attributes in kernel-managed attribute namespaces. */
4190 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4191                 size_t buflen)
4192 {
4193         struct inode *inode = dentry->d_inode;
4194
4195         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4196                 return -EOPNOTSUPP;
4197
4198         return nfs4_proc_get_acl(inode, buf, buflen);
4199 }
4200
4201 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4202 {
4203         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4204
4205         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4206                 return 0;
4207         if (buf && buflen < len)
4208                 return -ERANGE;
4209         if (buf)
4210                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4211         return len;
4212 }
4213
4214 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4215 {
4216         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4217                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4218                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4219                 return;
4220
4221         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4222                 NFS_ATTR_FATTR_NLINK;
4223         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4224         fattr->nlink = 2;
4225 }
4226
4227 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4228                 struct nfs4_fs_locations *fs_locations, struct page *page)
4229 {
4230         struct nfs_server *server = NFS_SERVER(dir);
4231         u32 bitmask[2] = {
4232                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4233                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4234         };
4235         struct nfs4_fs_locations_arg args = {
4236                 .dir_fh = NFS_FH(dir),
4237                 .name = name,
4238                 .page = page,
4239                 .bitmask = bitmask,
4240         };
4241         struct nfs4_fs_locations_res res = {
4242                 .fs_locations = fs_locations,
4243         };
4244         struct rpc_message msg = {
4245                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4246                 .rpc_argp = &args,
4247                 .rpc_resp = &res,
4248         };
4249         int status;
4250
4251         dprintk("%s: start\n", __func__);
4252         nfs_fattr_init(&fs_locations->fattr);
4253         fs_locations->server = server;
4254         fs_locations->nlocations = 0;
4255         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4256         nfs_fixup_referral_attributes(&fs_locations->fattr);
4257         dprintk("%s: returned status = %d\n", __func__, status);
4258         return status;
4259 }
4260
4261 #ifdef CONFIG_NFS_V4_1
4262 /*
4263  * nfs4_proc_exchange_id()
4264  *
4265  * Since the clientid has expired, all compounds using sessions
4266  * associated with the stale clientid will be returning
4267  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4268  * be in some phase of session reset.
4269  */
4270 static int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4271 {
4272         nfs4_verifier verifier;
4273         struct nfs41_exchange_id_args args = {
4274                 .client = clp,
4275                 .flags = clp->cl_exchange_flags,
4276         };
4277         struct nfs41_exchange_id_res res = {
4278                 .client = clp,
4279         };
4280         int status;
4281         struct rpc_message msg = {
4282                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4283                 .rpc_argp = &args,
4284                 .rpc_resp = &res,
4285                 .rpc_cred = cred,
4286         };
4287         __be32 *p;
4288
4289         dprintk("--> %s\n", __func__);
4290         BUG_ON(clp == NULL);
4291
4292         p = (u32 *)verifier.data;
4293         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4294         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4295         args.verifier = &verifier;
4296
4297         while (1) {
4298                 args.id_len = scnprintf(args.id, sizeof(args.id),
4299                                         "%s/%s %u",
4300                                         clp->cl_ipaddr,
4301                                         rpc_peeraddr2str(clp->cl_rpcclient,
4302                                                          RPC_DISPLAY_ADDR),
4303                                         clp->cl_id_uniquifier);
4304
4305                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4306
4307                 if (status != NFS4ERR_CLID_INUSE)
4308                         break;
4309
4310                 if (signalled())
4311                         break;
4312
4313                 if (++clp->cl_id_uniquifier == 0)
4314                         break;
4315         }
4316
4317         dprintk("<-- %s status= %d\n", __func__, status);
4318         return status;
4319 }
4320
4321 struct nfs4_get_lease_time_data {
4322         struct nfs4_get_lease_time_args *args;
4323         struct nfs4_get_lease_time_res *res;
4324         struct nfs_client *clp;
4325 };
4326
4327 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4328                                         void *calldata)
4329 {
4330         int ret;
4331         struct nfs4_get_lease_time_data *data =
4332                         (struct nfs4_get_lease_time_data *)calldata;
4333
4334         dprintk("--> %s\n", __func__);
4335         /* just setup sequence, do not trigger session recovery
4336            since we're invoked within one */
4337         ret = nfs41_setup_sequence(data->clp->cl_session,
4338                                         &data->args->la_seq_args,
4339                                         &data->res->lr_seq_res, 0, task);
4340
4341         BUG_ON(ret == -EAGAIN);
4342         rpc_call_start(task);
4343         dprintk("<-- %s\n", __func__);
4344 }
4345
4346 /*
4347  * Called from nfs4_state_manager thread for session setup, so don't recover
4348  * from sequence operation or clientid errors.
4349  */
4350 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4351 {
4352         struct nfs4_get_lease_time_data *data =
4353                         (struct nfs4_get_lease_time_data *)calldata;
4354
4355         dprintk("--> %s\n", __func__);
4356         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4357         switch (task->tk_status) {
4358         case -NFS4ERR_DELAY:
4359         case -NFS4ERR_GRACE:
4360                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4361                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4362                 task->tk_status = 0;
4363                 nfs4_restart_rpc(task, data->clp);
4364                 return;
4365         }
4366         nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
4367         dprintk("<-- %s\n", __func__);
4368 }
4369
4370 struct rpc_call_ops nfs4_get_lease_time_ops = {
4371         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4372         .rpc_call_done = nfs4_get_lease_time_done,
4373 };
4374
4375 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4376 {
4377         struct rpc_task *task;
4378         struct nfs4_get_lease_time_args args;
4379         struct nfs4_get_lease_time_res res = {
4380                 .lr_fsinfo = fsinfo,
4381         };
4382         struct nfs4_get_lease_time_data data = {
4383                 .args = &args,
4384                 .res = &res,
4385                 .clp = clp,
4386         };
4387         struct rpc_message msg = {
4388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4389                 .rpc_argp = &args,
4390                 .rpc_resp = &res,
4391         };
4392         struct rpc_task_setup task_setup = {
4393                 .rpc_client = clp->cl_rpcclient,
4394                 .rpc_message = &msg,
4395                 .callback_ops = &nfs4_get_lease_time_ops,
4396                 .callback_data = &data
4397         };
4398         int status;
4399
4400         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4401         dprintk("--> %s\n", __func__);
4402         task = rpc_run_task(&task_setup);
4403
4404         if (IS_ERR(task))
4405                 status = PTR_ERR(task);
4406         else {
4407                 status = task->tk_status;
4408                 rpc_put_task(task);
4409         }
4410         dprintk("<-- %s return %d\n", __func__, status);
4411
4412         return status;
4413 }
4414
4415 /*
4416  * Reset a slot table
4417  */
4418 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4419                 int old_max_slots, int ivalue)
4420 {
4421         int i;
4422         int ret = 0;
4423
4424         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4425
4426         /*
4427          * Until we have dynamic slot table adjustment, insist
4428          * upon the same slot table size
4429          */
4430         if (max_slots != old_max_slots) {
4431                 dprintk("%s reset slot table does't match old\n",
4432                         __func__);
4433                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4434                 goto out;
4435         }
4436         spin_lock(&tbl->slot_tbl_lock);
4437         for (i = 0; i < max_slots; ++i)
4438                 tbl->slots[i].seq_nr = ivalue;
4439         tbl->highest_used_slotid = -1;
4440         spin_unlock(&tbl->slot_tbl_lock);
4441         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4442                 tbl, tbl->slots, tbl->max_slots);
4443 out:
4444         dprintk("<-- %s: return %d\n", __func__, ret);
4445         return ret;
4446 }
4447
4448 /*
4449  * Reset the forechannel and backchannel slot tables
4450  */
4451 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4452 {
4453         int status;
4454
4455         status = nfs4_reset_slot_table(&session->fc_slot_table,
4456                         session->fc_attrs.max_reqs,
4457                         session->fc_slot_table.max_slots,
4458                         1);
4459         if (status)
4460                 return status;
4461
4462         status = nfs4_reset_slot_table(&session->bc_slot_table,
4463                         session->bc_attrs.max_reqs,
4464                         session->bc_slot_table.max_slots,
4465                         0);
4466         return status;
4467 }
4468
4469 /* Destroy the slot table */
4470 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4471 {
4472         if (session->fc_slot_table.slots != NULL) {
4473                 kfree(session->fc_slot_table.slots);
4474                 session->fc_slot_table.slots = NULL;
4475         }
4476         if (session->bc_slot_table.slots != NULL) {
4477                 kfree(session->bc_slot_table.slots);
4478                 session->bc_slot_table.slots = NULL;
4479         }
4480         return;
4481 }
4482
4483 /*
4484  * Initialize slot table
4485  */
4486 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4487                 int max_slots, int ivalue)
4488 {
4489         int i;
4490         struct nfs4_slot *slot;
4491         int ret = -ENOMEM;
4492
4493         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4494
4495         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4496
4497         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4498         if (!slot)
4499                 goto out;
4500         for (i = 0; i < max_slots; ++i)
4501                 slot[i].seq_nr = ivalue;
4502         ret = 0;
4503
4504         spin_lock(&tbl->slot_tbl_lock);
4505         if (tbl->slots != NULL) {
4506                 spin_unlock(&tbl->slot_tbl_lock);
4507                 dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
4508                         __func__, tbl, tbl->slots);
4509                 WARN_ON(1);
4510                 goto out_free;
4511         }
4512         tbl->max_slots = max_slots;
4513         tbl->slots = slot;
4514         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4515         spin_unlock(&tbl->slot_tbl_lock);
4516         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4517                 tbl, tbl->slots, tbl->max_slots);
4518 out:
4519         dprintk("<-- %s: return %d\n", __func__, ret);
4520         return ret;
4521
4522 out_free:
4523         kfree(slot);
4524         goto out;
4525 }
4526
4527 /*
4528  * Initialize the forechannel and backchannel tables
4529  */
4530 static int nfs4_init_slot_tables(struct nfs4_session *session)
4531 {
4532         int status;
4533
4534         status = nfs4_init_slot_table(&session->fc_slot_table,
4535                         session->fc_attrs.max_reqs, 1);
4536         if (status)
4537                 return status;
4538
4539         status = nfs4_init_slot_table(&session->bc_slot_table,
4540                         session->bc_attrs.max_reqs, 0);
4541         if (status)
4542                 nfs4_destroy_slot_tables(session);
4543
4544         return status;
4545 }
4546
4547 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4548 {
4549         struct nfs4_session *session;
4550         struct nfs4_slot_table *tbl;
4551
4552         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4553         if (!session)
4554                 return NULL;
4555
4556         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
4557         /*
4558          * The create session reply races with the server back
4559          * channel probe. Mark the client NFS_CS_SESSION_INITING
4560          * so that the client back channel can find the
4561          * nfs_client struct
4562          */
4563         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4564
4565         tbl = &session->fc_slot_table;
4566         spin_lock_init(&tbl->slot_tbl_lock);
4567         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4568
4569         tbl = &session->bc_slot_table;
4570         spin_lock_init(&tbl->slot_tbl_lock);
4571         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4572
4573         session->clp = clp;
4574         return session;
4575 }
4576
4577 void nfs4_destroy_session(struct nfs4_session *session)
4578 {
4579         nfs4_proc_destroy_session(session);
4580         dprintk("%s Destroy backchannel for xprt %p\n",
4581                 __func__, session->clp->cl_rpcclient->cl_xprt);
4582         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4583                                 NFS41_BC_MIN_CALLBACKS);
4584         nfs4_destroy_slot_tables(session);
4585         kfree(session);
4586 }
4587
4588 /*
4589  * Initialize the values to be used by the client in CREATE_SESSION
4590  * If nfs4_init_session set the fore channel request and response sizes,
4591  * use them.
4592  *
4593  * Set the back channel max_resp_sz_cached to zero to force the client to
4594  * always set csa_cachethis to FALSE because the current implementation
4595  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4596  */
4597 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4598 {
4599         struct nfs4_session *session = args->client->cl_session;
4600         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4601                      mxresp_sz = session->fc_attrs.max_resp_sz;
4602
4603         if (mxrqst_sz == 0)
4604                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4605         if (mxresp_sz == 0)
4606                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4607         /* Fore channel attributes */
4608         args->fc_attrs.headerpadsz = 0;
4609         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4610         args->fc_attrs.max_resp_sz = mxresp_sz;
4611         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4612         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4613         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4614
4615         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4616                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4617                 __func__,
4618                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4619                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4620                 args->fc_attrs.max_reqs);
4621
4622         /* Back channel attributes */
4623         args->bc_attrs.headerpadsz = 0;
4624         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4625         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4626         args->bc_attrs.max_resp_sz_cached = 0;
4627         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4628         args->bc_attrs.max_reqs = 1;
4629
4630         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4631                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4632                 __func__,
4633                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4634                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4635                 args->bc_attrs.max_reqs);
4636 }
4637
4638 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4639 {
4640         if (rcvd <= sent)
4641                 return 0;
4642         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4643                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4644         return -EINVAL;
4645 }
4646
4647 #define _verify_fore_channel_attr(_name_) \
4648         _verify_channel_attr("fore", #_name_, \
4649                              args->fc_attrs._name_, \
4650                              session->fc_attrs._name_)
4651
4652 #define _verify_back_channel_attr(_name_) \
4653         _verify_channel_attr("back", #_name_, \
4654                              args->bc_attrs._name_, \
4655                              session->bc_attrs._name_)
4656
4657 /*
4658  * The server is not allowed to increase the fore channel header pad size,
4659  * maximum response size, or maximum number of operations.
4660  *
4661  * The back channel attributes are only negotiatied down: We send what the
4662  * (back channel) server insists upon.
4663  */
4664 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4665                                      struct nfs4_session *session)
4666 {
4667         int ret = 0;
4668
4669         ret |= _verify_fore_channel_attr(headerpadsz);
4670         ret |= _verify_fore_channel_attr(max_resp_sz);
4671         ret |= _verify_fore_channel_attr(max_ops);
4672
4673         ret |= _verify_back_channel_attr(headerpadsz);
4674         ret |= _verify_back_channel_attr(max_rqst_sz);
4675         ret |= _verify_back_channel_attr(max_resp_sz);
4676         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4677         ret |= _verify_back_channel_attr(max_ops);
4678         ret |= _verify_back_channel_attr(max_reqs);
4679
4680         return ret;
4681 }
4682
4683 static int _nfs4_proc_create_session(struct nfs_client *clp)
4684 {
4685         struct nfs4_session *session = clp->cl_session;
4686         struct nfs41_create_session_args args = {
4687                 .client = clp,
4688                 .cb_program = NFS4_CALLBACK,
4689         };
4690         struct nfs41_create_session_res res = {
4691                 .client = clp,
4692         };
4693         struct rpc_message msg = {
4694                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4695                 .rpc_argp = &args,
4696                 .rpc_resp = &res,
4697         };
4698         int status;
4699
4700         nfs4_init_channel_attrs(&args);
4701         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4702
4703         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4704
4705         if (!status)
4706                 /* Verify the session's negotiated channel_attrs values */
4707                 status = nfs4_verify_channel_attrs(&args, session);
4708         if (!status) {
4709                 /* Increment the clientid slot sequence id */
4710                 clp->cl_seqid++;
4711         }
4712
4713         return status;
4714 }
4715
4716 /*
4717  * Issues a CREATE_SESSION operation to the server.
4718  * It is the responsibility of the caller to verify the session is
4719  * expired before calling this routine.
4720  */
4721 int nfs4_proc_create_session(struct nfs_client *clp, int reset)
4722 {
4723         int status;
4724         unsigned *ptr;
4725         struct nfs_fsinfo fsinfo;
4726         struct nfs4_session *session = clp->cl_session;
4727
4728         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4729
4730         status = _nfs4_proc_create_session(clp);
4731         if (status)
4732                 goto out;
4733
4734         /* Init or reset the fore channel */
4735         if (reset)
4736                 status = nfs4_reset_slot_tables(session);
4737         else
4738                 status = nfs4_init_slot_tables(session);
4739         dprintk("fore channel slot table initialization returned %d\n", status);
4740         if (status)
4741                 goto out;
4742
4743         ptr = (unsigned *)&session->sess_id.data[0];
4744         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4745                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4746
4747         if (reset)
4748                 /* Lease time is aleady set */
4749                 goto out;
4750
4751         /* Get the lease time */
4752         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4753         if (status == 0) {
4754                 /* Update lease time and schedule renewal */
4755                 spin_lock(&clp->cl_lock);
4756                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4757                 clp->cl_last_renewal = jiffies;
4758                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
4759                 spin_unlock(&clp->cl_lock);
4760
4761                 nfs4_schedule_state_renewal(clp);
4762         }
4763 out:
4764         dprintk("<-- %s\n", __func__);
4765         return status;
4766 }
4767
4768 /*
4769  * Issue the over-the-wire RPC DESTROY_SESSION.
4770  * The caller must serialize access to this routine.
4771  */
4772 int nfs4_proc_destroy_session(struct nfs4_session *session)
4773 {
4774         int status = 0;
4775         struct rpc_message msg;
4776
4777         dprintk("--> nfs4_proc_destroy_session\n");
4778
4779         /* session is still being setup */
4780         if (session->clp->cl_cons_state != NFS_CS_READY)
4781                 return status;
4782
4783         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4784         msg.rpc_argp = session;
4785         msg.rpc_resp = NULL;
4786         msg.rpc_cred = NULL;
4787         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4788
4789         if (status)
4790                 printk(KERN_WARNING
4791                         "Got error %d from the server on DESTROY_SESSION. "
4792                         "Session has been destroyed regardless...\n", status);
4793
4794         dprintk("<-- nfs4_proc_destroy_session\n");
4795         return status;
4796 }
4797
4798 int nfs4_init_session(struct nfs_server *server)
4799 {
4800         struct nfs_client *clp = server->nfs_client;
4801         int ret;
4802
4803         if (!nfs4_has_session(clp))
4804                 return 0;
4805
4806         clp->cl_session->fc_attrs.max_rqst_sz = server->wsize;
4807         clp->cl_session->fc_attrs.max_resp_sz = server->rsize;
4808         ret = nfs4_recover_expired_lease(server);
4809         if (!ret)
4810                 ret = nfs4_check_client_ready(clp);
4811         return ret;
4812 }
4813
4814 /*
4815  * Renew the cl_session lease.
4816  */
4817 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4818 {
4819         struct nfs4_sequence_args args;
4820         struct nfs4_sequence_res res;
4821
4822         struct rpc_message msg = {
4823                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4824                 .rpc_argp = &args,
4825                 .rpc_resp = &res,
4826                 .rpc_cred = cred,
4827         };
4828
4829         args.sa_cache_this = 0;
4830
4831         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4832                                        &res, 0);
4833 }
4834
4835 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4836 {
4837         struct nfs_client *clp = (struct nfs_client *)data;
4838
4839         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4840
4841         if (task->tk_status < 0) {
4842                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4843
4844                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4845                                                                 == -EAGAIN) {
4846                         nfs4_restart_rpc(task, clp);
4847                         return;
4848                 }
4849         }
4850         nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
4851         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4852
4853         put_rpccred(task->tk_msg.rpc_cred);
4854         kfree(task->tk_msg.rpc_argp);
4855         kfree(task->tk_msg.rpc_resp);
4856
4857         dprintk("<-- %s\n", __func__);
4858 }
4859
4860 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4861 {
4862         struct nfs_client *clp;
4863         struct nfs4_sequence_args *args;
4864         struct nfs4_sequence_res *res;
4865
4866         clp = (struct nfs_client *)data;
4867         args = task->tk_msg.rpc_argp;
4868         res = task->tk_msg.rpc_resp;
4869
4870         if (nfs4_setup_sequence(clp, args, res, 0, task))
4871                 return;
4872         rpc_call_start(task);
4873 }
4874
4875 static const struct rpc_call_ops nfs41_sequence_ops = {
4876         .rpc_call_done = nfs41_sequence_call_done,
4877         .rpc_call_prepare = nfs41_sequence_prepare,
4878 };
4879
4880 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4881                                      struct rpc_cred *cred)
4882 {
4883         struct nfs4_sequence_args *args;
4884         struct nfs4_sequence_res *res;
4885         struct rpc_message msg = {
4886                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4887                 .rpc_cred = cred,
4888         };
4889
4890         args = kzalloc(sizeof(*args), GFP_KERNEL);
4891         if (!args)
4892                 return -ENOMEM;
4893         res = kzalloc(sizeof(*res), GFP_KERNEL);
4894         if (!res) {
4895                 kfree(args);
4896                 return -ENOMEM;
4897         }
4898         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4899         msg.rpc_argp = args;
4900         msg.rpc_resp = res;
4901
4902         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4903                               &nfs41_sequence_ops, (void *)clp);
4904 }
4905
4906 #endif /* CONFIG_NFS_V4_1 */
4907
4908 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
4909         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4910         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4911         .recover_open   = nfs4_open_reclaim,
4912         .recover_lock   = nfs4_lock_reclaim,
4913         .establish_clid = nfs4_init_clientid,
4914         .get_clid_cred  = nfs4_get_setclientid_cred,
4915 };
4916
4917 #if defined(CONFIG_NFS_V4_1)
4918 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
4919         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4920         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4921         .recover_open   = nfs4_open_reclaim,
4922         .recover_lock   = nfs4_lock_reclaim,
4923         .establish_clid = nfs4_proc_exchange_id,
4924         .get_clid_cred  = nfs4_get_exchange_id_cred,
4925 };
4926 #endif /* CONFIG_NFS_V4_1 */
4927
4928 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
4929         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4930         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4931         .recover_open   = nfs4_open_expired,
4932         .recover_lock   = nfs4_lock_expired,
4933         .establish_clid = nfs4_init_clientid,
4934         .get_clid_cred  = nfs4_get_setclientid_cred,
4935 };
4936
4937 #if defined(CONFIG_NFS_V4_1)
4938 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
4939         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4940         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4941         .recover_open   = nfs4_open_expired,
4942         .recover_lock   = nfs4_lock_expired,
4943         .establish_clid = nfs4_proc_exchange_id,
4944         .get_clid_cred  = nfs4_get_exchange_id_cred,
4945 };
4946 #endif /* CONFIG_NFS_V4_1 */
4947
4948 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
4949         .sched_state_renewal = nfs4_proc_async_renew,
4950         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
4951         .renew_lease = nfs4_proc_renew,
4952 };
4953
4954 #if defined(CONFIG_NFS_V4_1)
4955 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
4956         .sched_state_renewal = nfs41_proc_async_sequence,
4957         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
4958         .renew_lease = nfs4_proc_sequence,
4959 };
4960 #endif
4961
4962 /*
4963  * Per minor version reboot and network partition recovery ops
4964  */
4965
4966 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
4967         &nfs40_reboot_recovery_ops,
4968 #if defined(CONFIG_NFS_V4_1)
4969         &nfs41_reboot_recovery_ops,
4970 #endif
4971 };
4972
4973 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
4974         &nfs40_nograce_recovery_ops,
4975 #if defined(CONFIG_NFS_V4_1)
4976         &nfs41_nograce_recovery_ops,
4977 #endif
4978 };
4979
4980 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
4981         &nfs40_state_renewal_ops,
4982 #if defined(CONFIG_NFS_V4_1)
4983         &nfs41_state_renewal_ops,
4984 #endif
4985 };
4986
4987 static const struct inode_operations nfs4_file_inode_operations = {
4988         .permission     = nfs_permission,
4989         .getattr        = nfs_getattr,
4990         .setattr        = nfs_setattr,
4991         .getxattr       = nfs4_getxattr,
4992         .setxattr       = nfs4_setxattr,
4993         .listxattr      = nfs4_listxattr,
4994 };
4995
4996 const struct nfs_rpc_ops nfs_v4_clientops = {
4997         .version        = 4,                    /* protocol version */
4998         .dentry_ops     = &nfs4_dentry_operations,
4999         .dir_inode_ops  = &nfs4_dir_inode_operations,
5000         .file_inode_ops = &nfs4_file_inode_operations,
5001         .getroot        = nfs4_proc_get_root,
5002         .getattr        = nfs4_proc_getattr,
5003         .setattr        = nfs4_proc_setattr,
5004         .lookupfh       = nfs4_proc_lookupfh,
5005         .lookup         = nfs4_proc_lookup,
5006         .access         = nfs4_proc_access,
5007         .readlink       = nfs4_proc_readlink,
5008         .create         = nfs4_proc_create,
5009         .remove         = nfs4_proc_remove,
5010         .unlink_setup   = nfs4_proc_unlink_setup,
5011         .unlink_done    = nfs4_proc_unlink_done,
5012         .rename         = nfs4_proc_rename,
5013         .link           = nfs4_proc_link,
5014         .symlink        = nfs4_proc_symlink,
5015         .mkdir          = nfs4_proc_mkdir,
5016         .rmdir          = nfs4_proc_remove,
5017         .readdir        = nfs4_proc_readdir,
5018         .mknod          = nfs4_proc_mknod,
5019         .statfs         = nfs4_proc_statfs,
5020         .fsinfo         = nfs4_proc_fsinfo,
5021         .pathconf       = nfs4_proc_pathconf,
5022         .set_capabilities = nfs4_server_capabilities,
5023         .decode_dirent  = nfs4_decode_dirent,
5024         .read_setup     = nfs4_proc_read_setup,
5025         .read_done      = nfs4_read_done,
5026         .write_setup    = nfs4_proc_write_setup,
5027         .write_done     = nfs4_write_done,
5028         .commit_setup   = nfs4_proc_commit_setup,
5029         .commit_done    = nfs4_commit_done,
5030         .lock           = nfs4_proc_lock,
5031         .clear_acl_cache = nfs4_zap_acl_attr,
5032         .close_context  = nfs4_close_context,
5033 };
5034
5035 /*
5036  * Local variables:
5037  *  c-basic-offset: 8
5038  * End:
5039  */