fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  65
  66 struct nfs4_opendata;
  67 static int _nfs4_proc_open(struct nfs4_opendata *data);
  68 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  69 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  70 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  71 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  72 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  74                             struct nfs_fattr *fattr, struct iattr *sattr,
  75                             struct nfs4_state *state);
  76
  77 /* Prevent leaks of NFSv4 errors into userland */
  78 static int nfs4_map_errors(int err)
  79 {
  80         if (err >= -1000)
  81                 return err;
  82         switch (err) {
  83         case -NFS4ERR_RESOURCE:
  84                 return -EREMOTEIO;
  85         default:
  86                 dprintk("%s could not handle NFSv4 error %d\n",
  87                                 __func__, -err);
  88                 break;
  89         }
  90         return -EIO;
  91 }
  92
  93 /*
  94  * This is our standard bitmap for GETATTR requests.
  95  */
  96 const u32 nfs4_fattr_bitmap[2] = {
  97         FATTR4_WORD0_TYPE
  98         | FATTR4_WORD0_CHANGE
  99         | FATTR4_WORD0_SIZE
 100         | FATTR4_WORD0_FSID
 101         | FATTR4_WORD0_FILEID,
 102         FATTR4_WORD1_MODE
 103         | FATTR4_WORD1_NUMLINKS
 104         | FATTR4_WORD1_OWNER
 105         | FATTR4_WORD1_OWNER_GROUP
 106         | FATTR4_WORD1_RAWDEV
 107         | FATTR4_WORD1_SPACE_USED
 108         | FATTR4_WORD1_TIME_ACCESS
 109         | FATTR4_WORD1_TIME_METADATA
 110         | FATTR4_WORD1_TIME_MODIFY
 111 };
 112
 113 const u32 nfs4_statfs_bitmap[2] = {
 114         FATTR4_WORD0_FILES_AVAIL
 115         | FATTR4_WORD0_FILES_FREE
 116         | FATTR4_WORD0_FILES_TOTAL,
 117         FATTR4_WORD1_SPACE_AVAIL
 118         | FATTR4_WORD1_SPACE_FREE
 119         | FATTR4_WORD1_SPACE_TOTAL
 120 };
 121
 122 const u32 nfs4_pathconf_bitmap[2] = {
 123         FATTR4_WORD0_MAXLINK
 124         | FATTR4_WORD0_MAXNAME,
 125         0
 126 };
 127
 128 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 129                         | FATTR4_WORD0_MAXREAD
 130                         | FATTR4_WORD0_MAXWRITE
 131                         | FATTR4_WORD0_LEASE_TIME,
 132                         0
 133 };
 134
 135 const u32 nfs4_fs_locations_bitmap[2] = {
 136         FATTR4_WORD0_TYPE
 137         | FATTR4_WORD0_CHANGE
 138         | FATTR4_WORD0_SIZE
 139         | FATTR4_WORD0_FSID
 140         | FATTR4_WORD0_FILEID
 141         | FATTR4_WORD0_FS_LOCATIONS,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY
 151         | FATTR4_WORD1_MOUNTED_ON_FILEID
 152 };
 153
 154 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 155                 struct nfs4_readdir_arg *readdir)
 156 {
 157         __be32 *start, *p;
 158
 159         BUG_ON(readdir->count < 80);
 160         if (cookie > 2) {
 161                 readdir->cookie = cookie;
 162                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 163                 return;
 164         }
 165
 166         readdir->cookie = 0;
 167         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 168         if (cookie == 2)
 169                 return;
 170
 171         /*
 172          * NFSv4 servers do not return entries for '.' and '..'
 173          * Therefore, we fake these entries here.  We let '.'
 174          * have cookie 0 and '..' have cookie 1.  Note that
 175          * when talking to the server, we always send cookie 0
 176          * instead of 1 or 2.
 177          */
 178         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 179
 180         if (cookie == 0) {
 181                 *p++ = xdr_one;                                  /* next */
 182                 *p++ = xdr_zero;                   /* cookie, first word */
 183                 *p++ = xdr_one;                   /* cookie, second word */
 184                 *p++ = xdr_one;                             /* entry len */
 185                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 186                 p++;
 187                 *p++ = xdr_one;                         /* bitmap length */
 188                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189                 *p++ = htonl(8);              /* attribute buffer length */
 190                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 191         }
 192
 193         *p++ = xdr_one;                                  /* next */
 194         *p++ = xdr_zero;                   /* cookie, first word */
 195         *p++ = xdr_two;                   /* cookie, second word */
 196         *p++ = xdr_two;                             /* entry len */
 197         memcpy(p, "..\0\0", 4);                         /* entry */
 198         p++;
 199         *p++ = xdr_one;                         /* bitmap length */
 200         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 201         *p++ = htonl(8);              /* attribute buffer length */
 202         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 203
 204         readdir->pgbase = (char *)p - (char *)start;
 205         readdir->count -= readdir->pgbase;
 206         kunmap_atomic(start, KM_USER0);
 207 }
 208
 209 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 210 {
 211         int res;
 212
 213         might_sleep();
 214
 215         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 216                         nfs_wait_bit_killable, TASK_KILLABLE);
 217         return res;
 218 }
 219
 220 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 221 {
 222         int res = 0;
 223
 224         might_sleep();
 225
 226         if (*timeout <= 0)
 227                 *timeout = NFS4_POLL_RETRY_MIN;
 228         if (*timeout > NFS4_POLL_RETRY_MAX)
 229                 *timeout = NFS4_POLL_RETRY_MAX;
 230         schedule_timeout_killable(*timeout);
 231         if (fatal_signal_pending(current))
 232                 res = -ERESTARTSYS;
 233         *timeout <<= 1;
 234         return res;
 235 }
 236
 237 /* This is the error handling routine for processes that are allowed
 238  * to sleep.
 239  */
 240 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 241 {
 242         struct nfs_client *clp = server->nfs_client;
 243         struct nfs4_state *state = exception->state;
 244         int ret = errorcode;
 245
 246         exception->retry = 0;
 247         switch(errorcode) {
 248                 case 0:
 249                         return 0;
 250                 case -NFS4ERR_ADMIN_REVOKED:
 251                 case -NFS4ERR_BAD_STATEID:
 252                 case -NFS4ERR_OPENMODE:
 253                         if (state == NULL)
 254                                 break;
 255                         nfs4_state_mark_reclaim_nograce(clp, state);
 256                         goto do_state_recovery;
 257                 case -NFS4ERR_STALE_STATEID:
 258                         if (state == NULL)
 259                                 break;
 260                         nfs4_state_mark_reclaim_reboot(clp, state);
 261                 case -NFS4ERR_STALE_CLIENTID:
 262                 case -NFS4ERR_EXPIRED:
 263                         goto do_state_recovery;
 264 #if defined(CONFIG_NFS_V4_1)
 265                 case -NFS4ERR_BADSESSION:
 266                 case -NFS4ERR_BADSLOT:
 267                 case -NFS4ERR_BAD_HIGH_SLOT:
 268                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 269                 case -NFS4ERR_DEADSESSION:
 270                 case -NFS4ERR_SEQ_FALSE_RETRY:
 271                 case -NFS4ERR_SEQ_MISORDERED:
 272                         dprintk("%s ERROR: %d Reset session\n", __func__,
 273                                 errorcode);
 274                         nfs4_schedule_state_recovery(clp);
 275                         exception->retry = 1;
 276                         break;
 277 #endif /* defined(CONFIG_NFS_V4_1) */
 278                 case -NFS4ERR_FILE_OPEN:
 279                         if (exception->timeout > HZ) {
 280                                 /* We have retried a decent amount, time to
 281                                  * fail
 282                                  */
 283                                 ret = -EBUSY;
 284                                 break;
 285                         }
 286                 case -NFS4ERR_GRACE:
 287                 case -NFS4ERR_DELAY:
 288                 case -EKEYEXPIRED:
 289                         ret = nfs4_delay(server->client, &exception->timeout);
 290                         if (ret != 0)
 291                                 break;
 292                 case -NFS4ERR_OLD_STATEID:
 293                         exception->retry = 1;
 294         }
 295         /* We failed to handle the error */
 296         return nfs4_map_errors(ret);
 297 do_state_recovery:
 298         nfs4_schedule_state_recovery(clp);
 299         ret = nfs4_wait_clnt_recover(clp);
 300         if (ret == 0)
 301                 exception->retry = 1;
 302         return ret;
 303 }
 304
 305
 306 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 307 {
 308         spin_lock(&clp->cl_lock);
 309         if (time_before(clp->cl_last_renewal,timestamp))
 310                 clp->cl_last_renewal = timestamp;
 311         spin_unlock(&clp->cl_lock);
 312 }
 313
 314 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 315 {
 316         do_renew_lease(server->nfs_client, timestamp);
 317 }
 318
 319 #if defined(CONFIG_NFS_V4_1)
 320
 321 /*
 322  * nfs4_free_slot - free a slot and efficiently update slot table.
 323  *
 324  * freeing a slot is trivially done by clearing its respective bit
 325  * in the bitmap.
 326  * If the freed slotid equals highest_used_slotid we want to update it
 327  * so that the server would be able to size down the slot table if needed,
 328  * otherwise we know that the highest_used_slotid is still in use.
 329  * When updating highest_used_slotid there may be "holes" in the bitmap
 330  * so we need to scan down from highest_used_slotid to 0 looking for the now
 331  * highest slotid in use.
 332  * If none found, highest_used_slotid is set to -1.
 333  *
 334  * Must be called while holding tbl->slot_tbl_lock
 335  */
 336 static void
 337 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 338 {
 339         int free_slotid = free_slot - tbl->slots;
 340         int slotid = free_slotid;
 341
 342         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 343         /* clear used bit in bitmap */
 344         __clear_bit(slotid, tbl->used_slots);
 345
 346         /* update highest_used_slotid when it is freed */
 347         if (slotid == tbl->highest_used_slotid) {
 348                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 349                 if (slotid < tbl->max_slots)
 350                         tbl->highest_used_slotid = slotid;
 351                 else
 352                         tbl->highest_used_slotid = -1;
 353         }
 354         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 355                 free_slotid, tbl->highest_used_slotid);
 356 }
 357
 358 /*
 359  * Signal state manager thread if session is drained
 360  */
 361 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 362 {
 363         struct rpc_task *task;
 364
 365         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 366                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 367                 if (task)
 368                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 369                 return;
 370         }
 371
 372         if (ses->fc_slot_table.highest_used_slotid != -1)
 373                 return;
 374
 375         dprintk("%s COMPLETE: Session Drained\n", __func__);
 376         complete(&ses->complete);
 377 }
 378
 379 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 380 {
 381         struct nfs4_slot_table *tbl;
 382
 383         tbl = &res->sr_session->fc_slot_table;
 384         if (!res->sr_slot) {
 385                 /* just wake up the next guy waiting since
 386                  * we may have not consumed a slot after all */
 387                 dprintk("%s: No slot\n", __func__);
 388                 return;
 389         }
 390
 391         spin_lock(&tbl->slot_tbl_lock);
 392         nfs4_free_slot(tbl, res->sr_slot);
 393         nfs41_check_drain_session_complete(res->sr_session);
 394         spin_unlock(&tbl->slot_tbl_lock);
 395         res->sr_slot = NULL;
 396 }
 397
 398 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 399 {
 400         unsigned long timestamp;
 401         struct nfs_client *clp;
 402
 403         /*
 404          * sr_status remains 1 if an RPC level error occurred. The server
 405          * may or may not have processed the sequence operation..
 406          * Proceed as if the server received and processed the sequence
 407          * operation.
 408          */
 409         if (res->sr_status == 1)
 410                 res->sr_status = NFS_OK;
 411
 412         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 413         if (!res->sr_slot)
 414                 goto out;
 415
 416         /* Check the SEQUENCE operation status */
 417         switch (res->sr_status) {
 418         case 0:
 419                 /* Update the slot's sequence and clientid lease timer */
 420                 ++res->sr_slot->seq_nr;
 421                 timestamp = res->sr_renewal_time;
 422                 clp = res->sr_session->clp;
 423                 do_renew_lease(clp, timestamp);
 424                 /* Check sequence flags */
 425                 if (atomic_read(&clp->cl_count) > 1)
 426                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 427                 break;
 428         case -NFS4ERR_DELAY:
 429                 /* The server detected a resend of the RPC call and
 430                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 431                  * of RFC5661.
 432                  */
 433                 dprintk("%s: slot=%ld seq=%d: Operation in progress\n",
 434                         __func__,
 435                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 436                         res->sr_slot->seq_nr);
 437                 goto out_retry;
 438         default:
 439                 /* Just update the slot sequence no. */
 440                 ++res->sr_slot->seq_nr;
 441         }
 442 out:
 443         /* The session may be reset by one of the error handlers. */
 444         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 445         nfs41_sequence_free_slot(res);
 446         return 1;
 447 out_retry:
 448         if (!rpc_restart_call(task))
 449                 goto out;
 450         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 451         return 0;
 452 }
 453
 454 static int nfs4_sequence_done(struct rpc_task *task,
 455                                struct nfs4_sequence_res *res)
 456 {
 457         if (res->sr_session == NULL)
 458                 return 1;
 459         return nfs41_sequence_done(task, res);
 460 }
 461
 462 /*
 463  * nfs4_find_slot - efficiently look for a free slot
 464  *
 465  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 466  * If found, we mark the slot as used, update the highest_used_slotid,
 467  * and respectively set up the sequence operation args.
 468  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 469  *
 470  * Note: must be called with under the slot_tbl_lock.
 471  */
 472 static u8
 473 nfs4_find_slot(struct nfs4_slot_table *tbl)
 474 {
 475         int slotid;
 476         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 477         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 478
 479         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 480                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 481                 tbl->max_slots);
 482         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 483         if (slotid >= tbl->max_slots)
 484                 goto out;
 485         __set_bit(slotid, tbl->used_slots);
 486         if (slotid > tbl->highest_used_slotid)
 487                 tbl->highest_used_slotid = slotid;
 488         ret_id = slotid;
 489 out:
 490         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 491                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 492         return ret_id;
 493 }
 494
 495 static int nfs41_setup_sequence(struct nfs4_session *session,
 496                                 struct nfs4_sequence_args *args,
 497                                 struct nfs4_sequence_res *res,
 498                                 int cache_reply,
 499                                 struct rpc_task *task)
 500 {
 501         struct nfs4_slot *slot;
 502         struct nfs4_slot_table *tbl;
 503         u8 slotid;
 504
 505         dprintk("--> %s\n", __func__);
 506         /* slot already allocated? */
 507         if (res->sr_slot != NULL)
 508                 return 0;
 509
 510         tbl = &session->fc_slot_table;
 511
 512         spin_lock(&tbl->slot_tbl_lock);
 513         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 514             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 515                 /*
 516                  * The state manager will wait until the slot table is empty.
 517                  * Schedule the reset thread
 518                  */
 519                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 520                 spin_unlock(&tbl->slot_tbl_lock);
 521                 dprintk("%s Schedule Session Reset\n", __func__);
 522                 return -EAGAIN;
 523         }
 524
 525         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 526             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 527                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 528                 spin_unlock(&tbl->slot_tbl_lock);
 529                 dprintk("%s enforce FIFO order\n", __func__);
 530                 return -EAGAIN;
 531         }
 532
 533         slotid = nfs4_find_slot(tbl);
 534         if (slotid == NFS4_MAX_SLOT_TABLE) {
 535                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 536                 spin_unlock(&tbl->slot_tbl_lock);
 537                 dprintk("<-- %s: no free slots\n", __func__);
 538                 return -EAGAIN;
 539         }
 540         spin_unlock(&tbl->slot_tbl_lock);
 541
 542         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 543         slot = tbl->slots + slotid;
 544         args->sa_session = session;
 545         args->sa_slotid = slotid;
 546         args->sa_cache_this = cache_reply;
 547
 548         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 549
 550         res->sr_session = session;
 551         res->sr_slot = slot;
 552         res->sr_renewal_time = jiffies;
 553         res->sr_status_flags = 0;
 554         /*
 555          * sr_status is only set in decode_sequence, and so will remain
 556          * set to 1 if an rpc level failure occurs.
 557          */
 558         res->sr_status = 1;
 559         return 0;
 560 }
 561
 562 int nfs4_setup_sequence(const struct nfs_server *server,
 563                         struct nfs4_sequence_args *args,
 564                         struct nfs4_sequence_res *res,
 565                         int cache_reply,
 566                         struct rpc_task *task)
 567 {
 568         struct nfs4_session *session = nfs4_get_session(server);
 569         int ret = 0;
 570
 571         if (session == NULL) {
 572                 args->sa_session = NULL;
 573                 res->sr_session = NULL;
 574                 goto out;
 575         }
 576
 577         dprintk("--> %s clp %p session %p sr_slot %ld\n",
 578                 __func__, session->clp, session, res->sr_slot ?
 579                         res->sr_slot - session->fc_slot_table.slots : -1);
 580
 581         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 582                                    task);
 583 out:
 584         dprintk("<-- %s status=%d\n", __func__, ret);
 585         return ret;
 586 }
 587
 588 struct nfs41_call_sync_data {
 589         const struct nfs_server *seq_server;
 590         struct nfs4_sequence_args *seq_args;
 591         struct nfs4_sequence_res *seq_res;
 592         int cache_reply;
 593 };
 594
 595 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 596 {
 597         struct nfs41_call_sync_data *data = calldata;
 598
 599         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 600
 601         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 602                                 data->seq_res, data->cache_reply, task))
 603                 return;
 604         rpc_call_start(task);
 605 }
 606
 607 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 608 {
 609         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 610         nfs41_call_sync_prepare(task, calldata);
 611 }
 612
 613 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 614 {
 615         struct nfs41_call_sync_data *data = calldata;
 616
 617         nfs41_sequence_done(task, data->seq_res);
 618 }
 619
 620 struct rpc_call_ops nfs41_call_sync_ops = {
 621         .rpc_call_prepare = nfs41_call_sync_prepare,
 622         .rpc_call_done = nfs41_call_sync_done,
 623 };
 624
 625 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 626         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 627         .rpc_call_done = nfs41_call_sync_done,
 628 };
 629
 630 static int nfs4_call_sync_sequence(struct nfs_server *server,
 631                                    struct rpc_message *msg,
 632                                    struct nfs4_sequence_args *args,
 633                                    struct nfs4_sequence_res *res,
 634                                    int cache_reply,
 635                                    int privileged)
 636 {
 637         int ret;
 638         struct rpc_task *task;
 639         struct nfs41_call_sync_data data = {
 640                 .seq_server = server,
 641                 .seq_args = args,
 642                 .seq_res = res,
 643                 .cache_reply = cache_reply,
 644         };
 645         struct rpc_task_setup task_setup = {
 646                 .rpc_client = server->client,
 647                 .rpc_message = msg,
 648                 .callback_ops = &nfs41_call_sync_ops,
 649                 .callback_data = &data
 650         };
 651
 652         res->sr_slot = NULL;
 653         if (privileged)
 654                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 655         task = rpc_run_task(&task_setup);
 656         if (IS_ERR(task))
 657                 ret = PTR_ERR(task);
 658         else {
 659                 ret = task->tk_status;
 660                 rpc_put_task(task);
 661         }
 662         return ret;
 663 }
 664
 665 int _nfs4_call_sync_session(struct nfs_server *server,
 666                             struct rpc_message *msg,
 667                             struct nfs4_sequence_args *args,
 668                             struct nfs4_sequence_res *res,
 669                             int cache_reply)
 670 {
 671         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 672 }
 673
 674 #else
 675 static int nfs4_sequence_done(struct rpc_task *task,
 676                                struct nfs4_sequence_res *res)
 677 {
 678         return 1;
 679 }
 680 #endif /* CONFIG_NFS_V4_1 */
 681
 682 int _nfs4_call_sync(struct nfs_server *server,
 683                     struct rpc_message *msg,
 684                     struct nfs4_sequence_args *args,
 685                     struct nfs4_sequence_res *res,
 686                     int cache_reply)
 687 {
 688         args->sa_session = res->sr_session = NULL;
 689         return rpc_call_sync(server->client, msg, 0);
 690 }
 691
 692 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 693         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 694                         &(res)->seq_res, (cache_reply))
 695
 696 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 697 {
 698         struct nfs_inode *nfsi = NFS_I(dir);
 699
 700         spin_lock(&dir->i_lock);
 701         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 702         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 703                 nfs_force_lookup_revalidate(dir);
 704         nfsi->change_attr = cinfo->after;
 705         spin_unlock(&dir->i_lock);
 706 }
 707
 708 struct nfs4_opendata {
 709         struct kref kref;
 710         struct nfs_openargs o_arg;
 711         struct nfs_openres o_res;
 712         struct nfs_open_confirmargs c_arg;
 713         struct nfs_open_confirmres c_res;
 714         struct nfs_fattr f_attr;
 715         struct nfs_fattr dir_attr;
 716         struct path path;
 717         struct dentry *dir;
 718         struct nfs4_state_owner *owner;
 719         struct nfs4_state *state;
 720         struct iattr attrs;
 721         unsigned long timestamp;
 722         unsigned int rpc_done : 1;
 723         int rpc_status;
 724         int cancelled;
 725 };
 726
 727
 728 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 729 {
 730         p->o_res.f_attr = &p->f_attr;
 731         p->o_res.dir_attr = &p->dir_attr;
 732         p->o_res.seqid = p->o_arg.seqid;
 733         p->c_res.seqid = p->c_arg.seqid;
 734         p->o_res.server = p->o_arg.server;
 735         nfs_fattr_init(&p->f_attr);
 736         nfs_fattr_init(&p->dir_attr);
 737 }
 738
 739 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 740                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 741                 const struct iattr *attrs,
 742                 gfp_t gfp_mask)
 743 {
 744         struct dentry *parent = dget_parent(path->dentry);
 745         struct inode *dir = parent->d_inode;
 746         struct nfs_server *server = NFS_SERVER(dir);
 747         struct nfs4_opendata *p;
 748
 749         p = kzalloc(sizeof(*p), gfp_mask);
 750         if (p == NULL)
 751                 goto err;
 752         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 753         if (p->o_arg.seqid == NULL)
 754                 goto err_free;
 755         path_get(path);
 756         p->path = *path;
 757         p->dir = parent;
 758         p->owner = sp;
 759         atomic_inc(&sp->so_count);
 760         p->o_arg.fh = NFS_FH(dir);
 761         p->o_arg.open_flags = flags;
 762         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 763         p->o_arg.clientid = server->nfs_client->cl_clientid;
 764         p->o_arg.id = sp->so_owner_id.id;
 765         p->o_arg.name = &p->path.dentry->d_name;
 766         p->o_arg.server = server;
 767         p->o_arg.bitmask = server->attr_bitmask;
 768         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 769         if (flags & O_CREAT) {
 770                 u32 *s;
 771
 772                 p->o_arg.u.attrs = &p->attrs;
 773                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 774                 s = (u32 *) p->o_arg.u.verifier.data;
 775                 s[0] = jiffies;
 776                 s[1] = current->pid;
 777         }
 778         p->c_arg.fh = &p->o_res.fh;
 779         p->c_arg.stateid = &p->o_res.stateid;
 780         p->c_arg.seqid = p->o_arg.seqid;
 781         nfs4_init_opendata_res(p);
 782         kref_init(&p->kref);
 783         return p;
 784 err_free:
 785         kfree(p);
 786 err:
 787         dput(parent);
 788         return NULL;
 789 }
 790
 791 static void nfs4_opendata_free(struct kref *kref)
 792 {
 793         struct nfs4_opendata *p = container_of(kref,
 794                         struct nfs4_opendata, kref);
 795
 796         nfs_free_seqid(p->o_arg.seqid);
 797         if (p->state != NULL)
 798                 nfs4_put_open_state(p->state);
 799         nfs4_put_state_owner(p->owner);
 800         dput(p->dir);
 801         path_put(&p->path);
 802         kfree(p);
 803 }
 804
 805 static void nfs4_opendata_put(struct nfs4_opendata *p)
 806 {
 807         if (p != NULL)
 808                 kref_put(&p->kref, nfs4_opendata_free);
 809 }
 810
 811 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 812 {
 813         int ret;
 814
 815         ret = rpc_wait_for_completion_task(task);
 816         return ret;
 817 }
 818
 819 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 820 {
 821         int ret = 0;
 822
 823         if (open_mode & O_EXCL)
 824                 goto out;
 825         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 826                 case FMODE_READ:
 827                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 828                                 && state->n_rdonly != 0;
 829                         break;
 830                 case FMODE_WRITE:
 831                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 832                                 && state->n_wronly != 0;
 833                         break;
 834                 case FMODE_READ|FMODE_WRITE:
 835                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 836                                 && state->n_rdwr != 0;
 837         }
 838 out:
 839         return ret;
 840 }
 841
 842 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 843 {
 844         if ((delegation->type & fmode) != fmode)
 845                 return 0;
 846         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 847                 return 0;
 848         nfs_mark_delegation_referenced(delegation);
 849         return 1;
 850 }
 851
 852 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 853 {
 854         switch (fmode) {
 855                 case FMODE_WRITE:
 856                         state->n_wronly++;
 857                         break;
 858                 case FMODE_READ:
 859                         state->n_rdonly++;
 860                         break;
 861                 case FMODE_READ|FMODE_WRITE:
 862                         state->n_rdwr++;
 863         }
 864         nfs4_state_set_mode_locked(state, state->state | fmode);
 865 }
 866
 867 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 868 {
 869         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 870                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 871         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 872         switch (fmode) {
 873                 case FMODE_READ:
 874                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 875                         break;
 876                 case FMODE_WRITE:
 877                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 878                         break;
 879                 case FMODE_READ|FMODE_WRITE:
 880                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 881         }
 882 }
 883
 884 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 885 {
 886         write_seqlock(&state->seqlock);
 887         nfs_set_open_stateid_locked(state, stateid, fmode);
 888         write_sequnlock(&state->seqlock);
 889 }
 890
 891 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 892 {
 893         /*
 894          * Protect the call to nfs4_state_set_mode_locked and
 895          * serialise the stateid update
 896          */
 897         write_seqlock(&state->seqlock);
 898         if (deleg_stateid != NULL) {
 899                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 900                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 901         }
 902         if (open_stateid != NULL)
 903                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 904         write_sequnlock(&state->seqlock);
 905         spin_lock(&state->owner->so_lock);
 906         update_open_stateflags(state, fmode);
 907         spin_unlock(&state->owner->so_lock);
 908 }
 909
 910 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 911 {
 912         struct nfs_inode *nfsi = NFS_I(state->inode);
 913         struct nfs_delegation *deleg_cur;
 914         int ret = 0;
 915
 916         fmode &= (FMODE_READ|FMODE_WRITE);
 917
 918         rcu_read_lock();
 919         deleg_cur = rcu_dereference(nfsi->delegation);
 920         if (deleg_cur == NULL)
 921                 goto no_delegation;
 922
 923         spin_lock(&deleg_cur->lock);
 924         if (nfsi->delegation != deleg_cur ||
 925             (deleg_cur->type & fmode) != fmode)
 926                 goto no_delegation_unlock;
 927
 928         if (delegation == NULL)
 929                 delegation = &deleg_cur->stateid;
 930         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 931                 goto no_delegation_unlock;
 932
 933         nfs_mark_delegation_referenced(deleg_cur);
 934         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 935         ret = 1;
 936 no_delegation_unlock:
 937         spin_unlock(&deleg_cur->lock);
 938 no_delegation:
 939         rcu_read_unlock();
 940
 941         if (!ret && open_stateid != NULL) {
 942                 __update_open_stateid(state, open_stateid, NULL, fmode);
 943                 ret = 1;
 944         }
 945
 946         return ret;
 947 }
 948
 949
 950 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 951 {
 952         struct nfs_delegation *delegation;
 953
 954         rcu_read_lock();
 955         delegation = rcu_dereference(NFS_I(inode)->delegation);
 956         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 957                 rcu_read_unlock();
 958                 return;
 959         }
 960         rcu_read_unlock();
 961         nfs_inode_return_delegation(inode);
 962 }
 963
 964 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 965 {
 966         struct nfs4_state *state = opendata->state;
 967         struct nfs_inode *nfsi = NFS_I(state->inode);
 968         struct nfs_delegation *delegation;
 969         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 970         fmode_t fmode = opendata->o_arg.fmode;
 971         nfs4_stateid stateid;
 972         int ret = -EAGAIN;
 973
 974         for (;;) {
 975                 if (can_open_cached(state, fmode, open_mode)) {
 976                         spin_lock(&state->owner->so_lock);
 977                         if (can_open_cached(state, fmode, open_mode)) {
 978                                 update_open_stateflags(state, fmode);
 979                                 spin_unlock(&state->owner->so_lock);
 980                                 goto out_return_state;
 981                         }
 982                         spin_unlock(&state->owner->so_lock);
 983                 }
 984                 rcu_read_lock();
 985                 delegation = rcu_dereference(nfsi->delegation);
 986                 if (delegation == NULL ||
 987                     !can_open_delegated(delegation, fmode)) {
 988                         rcu_read_unlock();
 989                         break;
 990                 }
 991                 /* Save the delegation */
 992                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 993                 rcu_read_unlock();
 994                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 995                 if (ret != 0)
 996                         goto out;
 997                 ret = -EAGAIN;
 998
 999                 /* Try to update the stateid using the delegation */
1000                 if (update_open_stateid(state, NULL, &stateid, fmode))
1001                         goto out_return_state;
1002         }
1003 out:
1004         return ERR_PTR(ret);
1005 out_return_state:
1006         atomic_inc(&state->count);
1007         return state;
1008 }
1009
1010 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1011 {
1012         struct inode *inode;
1013         struct nfs4_state *state = NULL;
1014         struct nfs_delegation *delegation;
1015         int ret;
1016
1017         if (!data->rpc_done) {
1018                 state = nfs4_try_open_cached(data);
1019                 goto out;
1020         }
1021
1022         ret = -EAGAIN;
1023         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1024                 goto err;
1025         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1026         ret = PTR_ERR(inode);
1027         if (IS_ERR(inode))
1028                 goto err;
1029         ret = -ENOMEM;
1030         state = nfs4_get_open_state(inode, data->owner);
1031         if (state == NULL)
1032                 goto err_put_inode;
1033         if (data->o_res.delegation_type != 0) {
1034                 int delegation_flags = 0;
1035
1036                 rcu_read_lock();
1037                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1038                 if (delegation)
1039                         delegation_flags = delegation->flags;
1040                 rcu_read_unlock();
1041                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1042                         nfs_inode_set_delegation(state->inode,
1043                                         data->owner->so_cred,
1044                                         &data->o_res);
1045                 else
1046                         nfs_inode_reclaim_delegation(state->inode,
1047                                         data->owner->so_cred,
1048                                         &data->o_res);
1049         }
1050
1051         update_open_stateid(state, &data->o_res.stateid, NULL,
1052                         data->o_arg.fmode);
1053         iput(inode);
1054 out:
1055         return state;
1056 err_put_inode:
1057         iput(inode);
1058 err:
1059         return ERR_PTR(ret);
1060 }
1061
1062 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1063 {
1064         struct nfs_inode *nfsi = NFS_I(state->inode);
1065         struct nfs_open_context *ctx;
1066
1067         spin_lock(&state->inode->i_lock);
1068         list_for_each_entry(ctx, &nfsi->open_files, list) {
1069                 if (ctx->state != state)
1070                         continue;
1071                 get_nfs_open_context(ctx);
1072                 spin_unlock(&state->inode->i_lock);
1073                 return ctx;
1074         }
1075         spin_unlock(&state->inode->i_lock);
1076         return ERR_PTR(-ENOENT);
1077 }
1078
1079 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1080 {
1081         struct nfs4_opendata *opendata;
1082
1083         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1084         if (opendata == NULL)
1085                 return ERR_PTR(-ENOMEM);
1086         opendata->state = state;
1087         atomic_inc(&state->count);
1088         return opendata;
1089 }
1090
1091 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1092 {
1093         struct nfs4_state *newstate;
1094         int ret;
1095
1096         opendata->o_arg.open_flags = 0;
1097         opendata->o_arg.fmode = fmode;
1098         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1099         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1100         nfs4_init_opendata_res(opendata);
1101         ret = _nfs4_recover_proc_open(opendata);
1102         if (ret != 0)
1103                 return ret;
1104         newstate = nfs4_opendata_to_nfs4_state(opendata);
1105         if (IS_ERR(newstate))
1106                 return PTR_ERR(newstate);
1107         nfs4_close_state(&opendata->path, newstate, fmode);
1108         *res = newstate;
1109         return 0;
1110 }
1111
1112 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1113 {
1114         struct nfs4_state *newstate;
1115         int ret;
1116
1117         /* memory barrier prior to reading state->n_* */
1118         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1119         smp_rmb();
1120         if (state->n_rdwr != 0) {
1121                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1122                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1123                 if (ret != 0)
1124                         return ret;
1125                 if (newstate != state)
1126                         return -ESTALE;
1127         }
1128         if (state->n_wronly != 0) {
1129                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1130                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1131                 if (ret != 0)
1132                         return ret;
1133                 if (newstate != state)
1134                         return -ESTALE;
1135         }
1136         if (state->n_rdonly != 0) {
1137                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1138                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1139                 if (ret != 0)
1140                         return ret;
1141                 if (newstate != state)
1142                         return -ESTALE;
1143         }
1144         /*
1145          * We may have performed cached opens for all three recoveries.
1146          * Check if we need to update the current stateid.
1147          */
1148         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1149             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1150                 write_seqlock(&state->seqlock);
1151                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1152                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1153                 write_sequnlock(&state->seqlock);
1154         }
1155         return 0;
1156 }
1157
1158 /*
1159  * OPEN_RECLAIM:
1160  *      reclaim state on the server after a reboot.
1161  */
1162 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1163 {
1164         struct nfs_delegation *delegation;
1165         struct nfs4_opendata *opendata;
1166         fmode_t delegation_type = 0;
1167         int status;
1168
1169         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1170         if (IS_ERR(opendata))
1171                 return PTR_ERR(opendata);
1172         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1173         opendata->o_arg.fh = NFS_FH(state->inode);
1174         rcu_read_lock();
1175         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1176         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1177                 delegation_type = delegation->type;
1178         rcu_read_unlock();
1179         opendata->o_arg.u.delegation_type = delegation_type;
1180         status = nfs4_open_recover(opendata, state);
1181         nfs4_opendata_put(opendata);
1182         return status;
1183 }
1184
1185 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1186 {
1187         struct nfs_server *server = NFS_SERVER(state->inode);
1188         struct nfs4_exception exception = { };
1189         int err;
1190         do {
1191                 err = _nfs4_do_open_reclaim(ctx, state);
1192                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
1193                         break;
1194                 nfs4_handle_exception(server, err, &exception);
1195         } while (exception.retry);
1196         return err;
1197 }
1198
1199 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1200 {
1201         struct nfs_open_context *ctx;
1202         int ret;
1203
1204         ctx = nfs4_state_find_open_context(state);
1205         if (IS_ERR(ctx))
1206                 return PTR_ERR(ctx);
1207         ret = nfs4_do_open_reclaim(ctx, state);
1208         put_nfs_open_context(ctx);
1209         return ret;
1210 }
1211
1212 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1213 {
1214         struct nfs4_opendata *opendata;
1215         int ret;
1216
1217         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1218         if (IS_ERR(opendata))
1219                 return PTR_ERR(opendata);
1220         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1221         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1222                         sizeof(opendata->o_arg.u.delegation.data));
1223         ret = nfs4_open_recover(opendata, state);
1224         nfs4_opendata_put(opendata);
1225         return ret;
1226 }
1227
1228 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1229 {
1230         struct nfs4_exception exception = { };
1231         struct nfs_server *server = NFS_SERVER(state->inode);
1232         int err;
1233         do {
1234                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1235                 switch (err) {
1236                         case 0:
1237                         case -ENOENT:
1238                         case -ESTALE:
1239                                 goto out;
1240                         case -NFS4ERR_BADSESSION:
1241                         case -NFS4ERR_BADSLOT:
1242                         case -NFS4ERR_BAD_HIGH_SLOT:
1243                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1244                         case -NFS4ERR_DEADSESSION:
1245                                 nfs4_schedule_state_recovery(
1246                                         server->nfs_client);
1247                                 goto out;
1248                         case -NFS4ERR_STALE_CLIENTID:
1249                         case -NFS4ERR_STALE_STATEID:
1250                         case -NFS4ERR_EXPIRED:
1251                                 /* Don't recall a delegation if it was lost */
1252                                 nfs4_schedule_state_recovery(server->nfs_client);
1253                                 goto out;
1254                         case -ERESTARTSYS:
1255                                 /*
1256                                  * The show must go on: exit, but mark the
1257                                  * stateid as needing recovery.
1258                                  */
1259                         case -NFS4ERR_ADMIN_REVOKED:
1260                         case -NFS4ERR_BAD_STATEID:
1261                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1262                         case -ENOMEM:
1263                                 err = 0;
1264                                 goto out;
1265                 }
1266                 err = nfs4_handle_exception(server, err, &exception);
1267         } while (exception.retry);
1268 out:
1269         return err;
1270 }
1271
1272 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1273 {
1274         struct nfs4_opendata *data = calldata;
1275
1276         data->rpc_status = task->tk_status;
1277         if (data->rpc_status == 0) {
1278                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1279                                 sizeof(data->o_res.stateid.data));
1280                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1281                 renew_lease(data->o_res.server, data->timestamp);
1282                 data->rpc_done = 1;
1283         }
1284 }
1285
1286 static void nfs4_open_confirm_release(void *calldata)
1287 {
1288         struct nfs4_opendata *data = calldata;
1289         struct nfs4_state *state = NULL;
1290
1291         /* If this request hasn't been cancelled, do nothing */
1292         if (data->cancelled == 0)
1293                 goto out_free;
1294         /* In case of error, no cleanup! */
1295         if (!data->rpc_done)
1296                 goto out_free;
1297         state = nfs4_opendata_to_nfs4_state(data);
1298         if (!IS_ERR(state))
1299                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1300 out_free:
1301         nfs4_opendata_put(data);
1302 }
1303
1304 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1305         .rpc_call_done = nfs4_open_confirm_done,
1306         .rpc_release = nfs4_open_confirm_release,
1307 };
1308
1309 /*
1310  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1311  */
1312 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1313 {
1314         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1315         struct rpc_task *task;
1316         struct  rpc_message msg = {
1317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1318                 .rpc_argp = &data->c_arg,
1319                 .rpc_resp = &data->c_res,
1320                 .rpc_cred = data->owner->so_cred,
1321         };
1322         struct rpc_task_setup task_setup_data = {
1323                 .rpc_client = server->client,
1324                 .rpc_message = &msg,
1325                 .callback_ops = &nfs4_open_confirm_ops,
1326                 .callback_data = data,
1327                 .workqueue = nfsiod_workqueue,
1328                 .flags = RPC_TASK_ASYNC,
1329         };
1330         int status;
1331
1332         kref_get(&data->kref);
1333         data->rpc_done = 0;
1334         data->rpc_status = 0;
1335         data->timestamp = jiffies;
1336         task = rpc_run_task(&task_setup_data);
1337         if (IS_ERR(task))
1338                 return PTR_ERR(task);
1339         status = nfs4_wait_for_completion_rpc_task(task);
1340         if (status != 0) {
1341                 data->cancelled = 1;
1342                 smp_wmb();
1343         } else
1344                 status = data->rpc_status;
1345         rpc_put_task(task);
1346         return status;
1347 }
1348
1349 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1350 {
1351         struct nfs4_opendata *data = calldata;
1352         struct nfs4_state_owner *sp = data->owner;
1353
1354         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1355                 return;
1356         /*
1357          * Check if we still need to send an OPEN call, or if we can use
1358          * a delegation instead.
1359          */
1360         if (data->state != NULL) {
1361                 struct nfs_delegation *delegation;
1362
1363                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1364                         goto out_no_action;
1365                 rcu_read_lock();
1366                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1367                 if (delegation != NULL &&
1368                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1369                         rcu_read_unlock();
1370                         goto out_no_action;
1371                 }
1372                 rcu_read_unlock();
1373         }
1374         /* Update sequence id. */
1375         data->o_arg.id = sp->so_owner_id.id;
1376         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1377         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1378                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1379                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1380         }
1381         data->timestamp = jiffies;
1382         if (nfs4_setup_sequence(data->o_arg.server,
1383                                 &data->o_arg.seq_args,
1384                                 &data->o_res.seq_res, 1, task))
1385                 return;
1386         rpc_call_start(task);
1387         return;
1388 out_no_action:
1389         task->tk_action = NULL;
1390
1391 }
1392
1393 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1394 {
1395         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1396         nfs4_open_prepare(task, calldata);
1397 }
1398
1399 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1400 {
1401         struct nfs4_opendata *data = calldata;
1402
1403         data->rpc_status = task->tk_status;
1404
1405         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1406                 return;
1407
1408         if (task->tk_status == 0) {
1409                 switch (data->o_res.f_attr->mode & S_IFMT) {
1410                         case S_IFREG:
1411                                 break;
1412                         case S_IFLNK:
1413                                 data->rpc_status = -ELOOP;
1414                                 break;
1415                         case S_IFDIR:
1416                                 data->rpc_status = -EISDIR;
1417                                 break;
1418                         default:
1419                                 data->rpc_status = -ENOTDIR;
1420                 }
1421                 renew_lease(data->o_res.server, data->timestamp);
1422                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1423                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1424         }
1425         data->rpc_done = 1;
1426 }
1427
1428 static void nfs4_open_release(void *calldata)
1429 {
1430         struct nfs4_opendata *data = calldata;
1431         struct nfs4_state *state = NULL;
1432
1433         /* If this request hasn't been cancelled, do nothing */
1434         if (data->cancelled == 0)
1435                 goto out_free;
1436         /* In case of error, no cleanup! */
1437         if (data->rpc_status != 0 || !data->rpc_done)
1438                 goto out_free;
1439         /* In case we need an open_confirm, no cleanup! */
1440         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1441                 goto out_free;
1442         state = nfs4_opendata_to_nfs4_state(data);
1443         if (!IS_ERR(state))
1444                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1445 out_free:
1446         nfs4_opendata_put(data);
1447 }
1448
1449 static const struct rpc_call_ops nfs4_open_ops = {
1450         .rpc_call_prepare = nfs4_open_prepare,
1451         .rpc_call_done = nfs4_open_done,
1452         .rpc_release = nfs4_open_release,
1453 };
1454
1455 static const struct rpc_call_ops nfs4_recover_open_ops = {
1456         .rpc_call_prepare = nfs4_recover_open_prepare,
1457         .rpc_call_done = nfs4_open_done,
1458         .rpc_release = nfs4_open_release,
1459 };
1460
1461 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1462 {
1463         struct inode *dir = data->dir->d_inode;
1464         struct nfs_server *server = NFS_SERVER(dir);
1465         struct nfs_openargs *o_arg = &data->o_arg;
1466         struct nfs_openres *o_res = &data->o_res;
1467         struct rpc_task *task;
1468         struct rpc_message msg = {
1469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1470                 .rpc_argp = o_arg,
1471                 .rpc_resp = o_res,
1472                 .rpc_cred = data->owner->so_cred,
1473         };
1474         struct rpc_task_setup task_setup_data = {
1475                 .rpc_client = server->client,
1476                 .rpc_message = &msg,
1477                 .callback_ops = &nfs4_open_ops,
1478                 .callback_data = data,
1479                 .workqueue = nfsiod_workqueue,
1480                 .flags = RPC_TASK_ASYNC,
1481         };
1482         int status;
1483
1484         kref_get(&data->kref);
1485         data->rpc_done = 0;
1486         data->rpc_status = 0;
1487         data->cancelled = 0;
1488         if (isrecover)
1489                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1490         task = rpc_run_task(&task_setup_data);
1491         if (IS_ERR(task))
1492                 return PTR_ERR(task);
1493         status = nfs4_wait_for_completion_rpc_task(task);
1494         if (status != 0) {
1495                 data->cancelled = 1;
1496                 smp_wmb();
1497         } else
1498                 status = data->rpc_status;
1499         rpc_put_task(task);
1500
1501         return status;
1502 }
1503
1504 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1505 {
1506         struct inode *dir = data->dir->d_inode;
1507         struct nfs_openres *o_res = &data->o_res;
1508         int status;
1509
1510         status = nfs4_run_open_task(data, 1);
1511         if (status != 0 || !data->rpc_done)
1512                 return status;
1513
1514         nfs_refresh_inode(dir, o_res->dir_attr);
1515
1516         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1517                 status = _nfs4_proc_open_confirm(data);
1518                 if (status != 0)
1519                         return status;
1520         }
1521
1522         return status;
1523 }
1524
1525 /*
1526  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1527  */
1528 static int _nfs4_proc_open(struct nfs4_opendata *data)
1529 {
1530         struct inode *dir = data->dir->d_inode;
1531         struct nfs_server *server = NFS_SERVER(dir);
1532         struct nfs_openargs *o_arg = &data->o_arg;
1533         struct nfs_openres *o_res = &data->o_res;
1534         int status;
1535
1536         status = nfs4_run_open_task(data, 0);
1537         if (status != 0 || !data->rpc_done)
1538                 return status;
1539
1540         if (o_arg->open_flags & O_CREAT) {
1541                 update_changeattr(dir, &o_res->cinfo);
1542                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1543         } else
1544                 nfs_refresh_inode(dir, o_res->dir_attr);
1545         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1546                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1547         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1548                 status = _nfs4_proc_open_confirm(data);
1549                 if (status != 0)
1550                         return status;
1551         }
1552         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1553                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1554         return 0;
1555 }
1556
1557 static int nfs4_recover_expired_lease(struct nfs_server *server)
1558 {
1559         struct nfs_client *clp = server->nfs_client;
1560         unsigned int loop;
1561         int ret;
1562
1563         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1564                 ret = nfs4_wait_clnt_recover(clp);
1565                 if (ret != 0)
1566                         break;
1567                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1568                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1569                         break;
1570                 nfs4_schedule_state_recovery(clp);
1571                 ret = -EIO;
1572         }
1573         return ret;
1574 }
1575
1576 /*
1577  * OPEN_EXPIRED:
1578  *      reclaim state on the server after a network partition.
1579  *      Assumes caller holds the appropriate lock
1580  */
1581 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1582 {
1583         struct nfs4_opendata *opendata;
1584         int ret;
1585
1586         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1587         if (IS_ERR(opendata))
1588                 return PTR_ERR(opendata);
1589         ret = nfs4_open_recover(opendata, state);
1590         if (ret == -ESTALE)
1591                 d_drop(ctx->path.dentry);
1592         nfs4_opendata_put(opendata);
1593         return ret;
1594 }
1595
1596 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1597 {
1598         struct nfs_server *server = NFS_SERVER(state->inode);
1599         struct nfs4_exception exception = { };
1600         int err;
1601
1602         do {
1603                 err = _nfs4_open_expired(ctx, state);
1604                 switch (err) {
1605                 default:
1606                         goto out;
1607                 case -NFS4ERR_GRACE:
1608                 case -NFS4ERR_DELAY:
1609                 case -EKEYEXPIRED:
1610                         nfs4_handle_exception(server, err, &exception);
1611                         err = 0;
1612                 }
1613         } while (exception.retry);
1614 out:
1615         return err;
1616 }
1617
1618 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1619 {
1620         struct nfs_open_context *ctx;
1621         int ret;
1622
1623         ctx = nfs4_state_find_open_context(state);
1624         if (IS_ERR(ctx))
1625                 return PTR_ERR(ctx);
1626         ret = nfs4_do_open_expired(ctx, state);
1627         put_nfs_open_context(ctx);
1628         return ret;
1629 }
1630
1631 /*
1632  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1633  * fields corresponding to attributes that were used to store the verifier.
1634  * Make sure we clobber those fields in the later setattr call
1635  */
1636 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1637 {
1638         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1639             !(sattr->ia_valid & ATTR_ATIME_SET))
1640                 sattr->ia_valid |= ATTR_ATIME;
1641
1642         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1643             !(sattr->ia_valid & ATTR_MTIME_SET))
1644                 sattr->ia_valid |= ATTR_MTIME;
1645 }
1646
1647 /*
1648  * Returns a referenced nfs4_state
1649  */
1650 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)
1651 {
1652         struct nfs4_state_owner  *sp;
1653         struct nfs4_state     *state = NULL;
1654         struct nfs_server       *server = NFS_SERVER(dir);
1655         struct nfs4_opendata *opendata;
1656         int status;
1657
1658         /* Protect against reboot recovery conflicts */
1659         status = -ENOMEM;
1660         if (!(sp = nfs4_get_state_owner(server, cred))) {
1661                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1662                 goto out_err;
1663         }
1664         status = nfs4_recover_expired_lease(server);
1665         if (status != 0)
1666                 goto err_put_state_owner;
1667         if (path->dentry->d_inode != NULL)
1668                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1669         status = -ENOMEM;
1670         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1671         if (opendata == NULL)
1672                 goto err_put_state_owner;
1673
1674         if (path->dentry->d_inode != NULL)
1675                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1676
1677         status = _nfs4_proc_open(opendata);
1678         if (status != 0)
1679                 goto err_opendata_put;
1680
1681         state = nfs4_opendata_to_nfs4_state(opendata);
1682         status = PTR_ERR(state);
1683         if (IS_ERR(state))
1684                 goto err_opendata_put;
1685         if (server->caps & NFS_CAP_POSIX_LOCK)
1686                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1687
1688         if (opendata->o_arg.open_flags & O_EXCL) {
1689                 nfs4_exclusive_attrset(opendata, sattr);
1690
1691                 nfs_fattr_init(opendata->o_res.f_attr);
1692                 status = nfs4_do_setattr(state->inode, cred,
1693                                 opendata->o_res.f_attr, sattr,
1694                                 state);
1695                 if (status == 0)
1696                         nfs_setattr_update_inode(state->inode, sattr);
1697                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1698         }
1699         nfs4_opendata_put(opendata);
1700         nfs4_put_state_owner(sp);
1701         *res = state;
1702         return 0;
1703 err_opendata_put:
1704         nfs4_opendata_put(opendata);
1705 err_put_state_owner:
1706         nfs4_put_state_owner(sp);
1707 out_err:
1708         *res = NULL;
1709         return status;
1710 }
1711
1712
1713 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)
1714 {
1715         struct nfs4_exception exception = { };
1716         struct nfs4_state *res;
1717         int status;
1718
1719         do {
1720                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1721                 if (status == 0)
1722                         break;
1723                 /* NOTE: BAD_SEQID means the server and client disagree about the
1724                  * book-keeping w.r.t. state-changing operations
1725                  * (OPEN/CLOSE/LOCK/LOCKU...)
1726                  * It is actually a sign of a bug on the client or on the server.
1727                  *
1728                  * If we receive a BAD_SEQID error in the particular case of
1729                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1730                  * have unhashed the old state_owner for us, and that we can
1731                  * therefore safely retry using a new one. We should still warn
1732                  * the user though...
1733                  */
1734                 if (status == -NFS4ERR_BAD_SEQID) {
1735                         printk(KERN_WARNING "NFS: v4 server %s "
1736                                         " returned a bad sequence-id error!\n",
1737                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1738                         exception.retry = 1;
1739                         continue;
1740                 }
1741                 /*
1742                  * BAD_STATEID on OPEN means that the server cancelled our
1743                  * state before it received the OPEN_CONFIRM.
1744                  * Recover by retrying the request as per the discussion
1745                  * on Page 181 of RFC3530.
1746                  */
1747                 if (status == -NFS4ERR_BAD_STATEID) {
1748                         exception.retry = 1;
1749                         continue;
1750                 }
1751                 if (status == -EAGAIN) {
1752                         /* We must have found a delegation */
1753                         exception.retry = 1;
1754                         continue;
1755                 }
1756                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1757                                         status, &exception));
1758         } while (exception.retry);
1759         return res;
1760 }
1761
1762 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1763                             struct nfs_fattr *fattr, struct iattr *sattr,
1764                             struct nfs4_state *state)
1765 {
1766         struct nfs_server *server = NFS_SERVER(inode);
1767         struct nfs_setattrargs  arg = {
1768                 .fh             = NFS_FH(inode),
1769                 .iap            = sattr,
1770                 .server         = server,
1771                 .bitmask = server->attr_bitmask,
1772         };
1773         struct nfs_setattrres  res = {
1774                 .fattr          = fattr,
1775                 .server         = server,
1776         };
1777         struct rpc_message msg = {
1778                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1779                 .rpc_argp       = &arg,
1780                 .rpc_resp       = &res,
1781                 .rpc_cred       = cred,
1782         };
1783         unsigned long timestamp = jiffies;
1784         int status;
1785
1786         nfs_fattr_init(fattr);
1787
1788         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1789                 /* Use that stateid */
1790         } else if (state != NULL) {
1791                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1792         } else
1793                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1794
1795         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1796         if (status == 0 && state != NULL)
1797                 renew_lease(server, timestamp);
1798         return status;
1799 }
1800
1801 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1802                            struct nfs_fattr *fattr, struct iattr *sattr,
1803                            struct nfs4_state *state)
1804 {
1805         struct nfs_server *server = NFS_SERVER(inode);
1806         struct nfs4_exception exception = { };
1807         int err;
1808         do {
1809                 err = nfs4_handle_exception(server,
1810                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1811                                 &exception);
1812         } while (exception.retry);
1813         return err;
1814 }
1815
1816 struct nfs4_closedata {
1817         struct path path;
1818         struct inode *inode;
1819         struct nfs4_state *state;
1820         struct nfs_closeargs arg;
1821         struct nfs_closeres res;
1822         struct nfs_fattr fattr;
1823         unsigned long timestamp;
1824 };
1825
1826 static void nfs4_free_closedata(void *data)
1827 {
1828         struct nfs4_closedata *calldata = data;
1829         struct nfs4_state_owner *sp = calldata->state->owner;
1830
1831         nfs4_put_open_state(calldata->state);
1832         nfs_free_seqid(calldata->arg.seqid);
1833         nfs4_put_state_owner(sp);
1834         path_put(&calldata->path);
1835         kfree(calldata);
1836 }
1837
1838 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1839                 fmode_t fmode)
1840 {
1841         spin_lock(&state->owner->so_lock);
1842         if (!(fmode & FMODE_READ))
1843                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1844         if (!(fmode & FMODE_WRITE))
1845                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1846         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1847         spin_unlock(&state->owner->so_lock);
1848 }
1849
1850 static void nfs4_close_done(struct rpc_task *task, void *data)
1851 {
1852         struct nfs4_closedata *calldata = data;
1853         struct nfs4_state *state = calldata->state;
1854         struct nfs_server *server = NFS_SERVER(calldata->inode);
1855
1856         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1857                 return;
1858         /* hmm. we are done with the inode, and in the process of freeing
1859          * the state_owner. we keep this around to process errors
1860          */
1861         switch (task->tk_status) {
1862                 case 0:
1863                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1864                         renew_lease(server, calldata->timestamp);
1865                         nfs4_close_clear_stateid_flags(state,
1866                                         calldata->arg.fmode);
1867                         break;
1868                 case -NFS4ERR_STALE_STATEID:
1869                 case -NFS4ERR_OLD_STATEID:
1870                 case -NFS4ERR_BAD_STATEID:
1871                 case -NFS4ERR_EXPIRED:
1872                         if (calldata->arg.fmode == 0)
1873                                 break;
1874                 default:
1875                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1876                                 rpc_restart_call_prepare(task);
1877         }
1878         nfs_release_seqid(calldata->arg.seqid);
1879         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1880 }
1881
1882 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1883 {
1884         struct nfs4_closedata *calldata = data;
1885         struct nfs4_state *state = calldata->state;
1886         int call_close = 0;
1887
1888         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1889                 return;
1890
1891         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1892         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1893         spin_lock(&state->owner->so_lock);
1894         /* Calculate the change in open mode */
1895         if (state->n_rdwr == 0) {
1896                 if (state->n_rdonly == 0) {
1897                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1898                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1899                         calldata->arg.fmode &= ~FMODE_READ;
1900                 }
1901                 if (state->n_wronly == 0) {
1902                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1903                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1904                         calldata->arg.fmode &= ~FMODE_WRITE;
1905                 }
1906         }
1907         spin_unlock(&state->owner->so_lock);
1908
1909         if (!call_close) {
1910                 /* Note: exit _without_ calling nfs4_close_done */
1911                 task->tk_action = NULL;
1912                 return;
1913         }
1914
1915         if (calldata->arg.fmode == 0)
1916                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1917
1918         nfs_fattr_init(calldata->res.fattr);
1919         calldata->timestamp = jiffies;
1920         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1921                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1922                                 1, task))
1923                 return;
1924         rpc_call_start(task);
1925 }
1926
1927 static const struct rpc_call_ops nfs4_close_ops = {
1928         .rpc_call_prepare = nfs4_close_prepare,
1929         .rpc_call_done = nfs4_close_done,
1930         .rpc_release = nfs4_free_closedata,
1931 };
1932
1933 /*
1934  * It is possible for data to be read/written from a mem-mapped file
1935  * after the sys_close call (which hits the vfs layer as a flush).
1936  * This means that we can't safely call nfsv4 close on a file until
1937  * the inode is cleared. This in turn means that we are not good
1938  * NFSv4 citizens - we do not indicate to the server to update the file's
1939  * share state even when we are done with one of the three share
1940  * stateid's in the inode.
1941  *
1942  * NOTE: Caller must be holding the sp->so_owner semaphore!
1943  */
1944 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1945 {
1946         struct nfs_server *server = NFS_SERVER(state->inode);
1947         struct nfs4_closedata *calldata;
1948         struct nfs4_state_owner *sp = state->owner;
1949         struct rpc_task *task;
1950         struct rpc_message msg = {
1951                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1952                 .rpc_cred = state->owner->so_cred,
1953         };
1954         struct rpc_task_setup task_setup_data = {
1955                 .rpc_client = server->client,
1956                 .rpc_message = &msg,
1957                 .callback_ops = &nfs4_close_ops,
1958                 .workqueue = nfsiod_workqueue,
1959                 .flags = RPC_TASK_ASYNC,
1960         };
1961         int status = -ENOMEM;
1962
1963         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1964         if (calldata == NULL)
1965                 goto out;
1966         calldata->inode = state->inode;
1967         calldata->state = state;
1968         calldata->arg.fh = NFS_FH(state->inode);
1969         calldata->arg.stateid = &state->open_stateid;
1970         /* Serialization for the sequence id */
1971         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1972         if (calldata->arg.seqid == NULL)
1973                 goto out_free_calldata;
1974         calldata->arg.fmode = 0;
1975         calldata->arg.bitmask = server->cache_consistency_bitmask;
1976         calldata->res.fattr = &calldata->fattr;
1977         calldata->res.seqid = calldata->arg.seqid;
1978         calldata->res.server = server;
1979         path_get(path);
1980         calldata->path = *path;
1981
1982         msg.rpc_argp = &calldata->arg,
1983         msg.rpc_resp = &calldata->res,
1984         task_setup_data.callback_data = calldata;
1985         task = rpc_run_task(&task_setup_data);
1986         if (IS_ERR(task))
1987                 return PTR_ERR(task);
1988         status = 0;
1989         if (wait)
1990                 status = rpc_wait_for_completion_task(task);
1991         rpc_put_task(task);
1992         return status;
1993 out_free_calldata:
1994         kfree(calldata);
1995 out:
1996         nfs4_put_open_state(state);
1997         nfs4_put_state_owner(sp);
1998         return status;
1999 }
2000
2001 static struct inode *
2002 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2003 {
2004         struct nfs4_state *state;
2005
2006         /* Protect against concurrent sillydeletes */
2007         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2008         if (IS_ERR(state))
2009                 return ERR_CAST(state);
2010         ctx->state = state;
2011         return igrab(state->inode);
2012 }
2013
2014 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2015 {
2016         if (ctx->state == NULL)
2017                 return;
2018         if (is_sync)
2019                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2020         else
2021                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2022 }
2023
2024 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2025 {
2026         struct nfs4_server_caps_arg args = {
2027                 .fhandle = fhandle,
2028         };
2029         struct nfs4_server_caps_res res = {};
2030         struct rpc_message msg = {
2031                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2032                 .rpc_argp = &args,
2033                 .rpc_resp = &res,
2034         };
2035         int status;
2036
2037         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2038         if (status == 0) {
2039                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2040                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2041                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2042                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2043                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2044                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2045                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2046                         server->caps |= NFS_CAP_ACLS;
2047                 if (res.has_links != 0)
2048                         server->caps |= NFS_CAP_HARDLINKS;
2049                 if (res.has_symlinks != 0)
2050                         server->caps |= NFS_CAP_SYMLINKS;
2051                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2052                         server->caps |= NFS_CAP_FILEID;
2053                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2054                         server->caps |= NFS_CAP_MODE;
2055                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2056                         server->caps |= NFS_CAP_NLINK;
2057                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2058                         server->caps |= NFS_CAP_OWNER;
2059                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2060                         server->caps |= NFS_CAP_OWNER_GROUP;
2061                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2062                         server->caps |= NFS_CAP_ATIME;
2063                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2064                         server->caps |= NFS_CAP_CTIME;
2065                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2066                         server->caps |= NFS_CAP_MTIME;
2067
2068                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2069                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2070                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2071                 server->acl_bitmask = res.acl_bitmask;
2072         }
2073
2074         return status;
2075 }
2076
2077 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2078 {
2079         struct nfs4_exception exception = { };
2080         int err;
2081         do {
2082                 err = nfs4_handle_exception(server,
2083                                 _nfs4_server_capabilities(server, fhandle),
2084                                 &exception);
2085         } while (exception.retry);
2086         return err;
2087 }
2088
2089 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2090                 struct nfs_fsinfo *info)
2091 {
2092         struct nfs4_lookup_root_arg args = {
2093                 .bitmask = nfs4_fattr_bitmap,
2094         };
2095         struct nfs4_lookup_res res = {
2096                 .server = server,
2097                 .fattr = info->fattr,
2098                 .fh = fhandle,
2099         };
2100         struct rpc_message msg = {
2101                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2102                 .rpc_argp = &args,
2103                 .rpc_resp = &res,
2104         };
2105
2106         nfs_fattr_init(info->fattr);
2107         return nfs4_call_sync(server, &msg, &args, &res, 0);
2108 }
2109
2110 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2111                 struct nfs_fsinfo *info)
2112 {
2113         struct nfs4_exception exception = { };
2114         int err;
2115         do {
2116                 err = nfs4_handle_exception(server,
2117                                 _nfs4_lookup_root(server, fhandle, info),
2118                                 &exception);
2119         } while (exception.retry);
2120         return err;
2121 }
2122
2123 /*
2124  * get the file handle for the "/" directory on the server
2125  */
2126 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2127                               struct nfs_fsinfo *info)
2128 {
2129         int status;
2130
2131         status = nfs4_lookup_root(server, fhandle, info);
2132         if (status == 0)
2133                 status = nfs4_server_capabilities(server, fhandle);
2134         if (status == 0)
2135                 status = nfs4_do_fsinfo(server, fhandle, info);
2136         return nfs4_map_errors(status);
2137 }
2138
2139 /*
2140  * Get locations and (maybe) other attributes of a referral.
2141  * Note that we'll actually follow the referral later when
2142  * we detect fsid mismatch in inode revalidation
2143  */
2144 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2145 {
2146         int status = -ENOMEM;
2147         struct page *page = NULL;
2148         struct nfs4_fs_locations *locations = NULL;
2149
2150         page = alloc_page(GFP_KERNEL);
2151         if (page == NULL)
2152                 goto out;
2153         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2154         if (locations == NULL)
2155                 goto out;
2156
2157         status = nfs4_proc_fs_locations(dir, name, locations, page);
2158         if (status != 0)
2159                 goto out;
2160         /* Make sure server returned a different fsid for the referral */
2161         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2162                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2163                 status = -EIO;
2164                 goto out;
2165         }
2166
2167         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2168         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2169         if (!fattr->mode)
2170                 fattr->mode = S_IFDIR;
2171         memset(fhandle, 0, sizeof(struct nfs_fh));
2172 out:
2173         if (page)
2174                 __free_page(page);
2175         kfree(locations);
2176         return status;
2177 }
2178
2179 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2180 {
2181         struct nfs4_getattr_arg args = {
2182                 .fh = fhandle,
2183                 .bitmask = server->attr_bitmask,
2184         };
2185         struct nfs4_getattr_res res = {
2186                 .fattr = fattr,
2187                 .server = server,
2188         };
2189         struct rpc_message msg = {
2190                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2191                 .rpc_argp = &args,
2192                 .rpc_resp = &res,
2193         };
2194
2195         nfs_fattr_init(fattr);
2196         return nfs4_call_sync(server, &msg, &args, &res, 0);
2197 }
2198
2199 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2200 {
2201         struct nfs4_exception exception = { };
2202         int err;
2203         do {
2204                 err = nfs4_handle_exception(server,
2205                                 _nfs4_proc_getattr(server, fhandle, fattr),
2206                                 &exception);
2207         } while (exception.retry);
2208         return err;
2209 }
2210
2211 /*
2212  * The file is not closed if it is opened due to the a request to change
2213  * the size of the file. The open call will not be needed once the
2214  * VFS layer lookup-intents are implemented.
2215  *
2216  * Close is called when the inode is destroyed.
2217  * If we haven't opened the file for O_WRONLY, we
2218  * need to in the size_change case to obtain a stateid.
2219  *
2220  * Got race?
2221  * Because OPEN is always done by name in nfsv4, it is
2222  * possible that we opened a different file by the same
2223  * name.  We can recognize this race condition, but we
2224  * can't do anything about it besides returning an error.
2225  *
2226  * This will be fixed with VFS changes (lookup-intent).
2227  */
2228 static int
2229 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2230                   struct iattr *sattr)
2231 {
2232         struct inode *inode = dentry->d_inode;
2233         struct rpc_cred *cred = NULL;
2234         struct nfs4_state *state = NULL;
2235         int status;
2236
2237         nfs_fattr_init(fattr);
2238
2239         /* Search for an existing open(O_WRITE) file */
2240         if (sattr->ia_valid & ATTR_FILE) {
2241                 struct nfs_open_context *ctx;
2242
2243                 ctx = nfs_file_open_context(sattr->ia_file);
2244                 if (ctx) {
2245                         cred = ctx->cred;
2246                         state = ctx->state;
2247                 }
2248         }
2249
2250         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2251         if (status == 0)
2252                 nfs_setattr_update_inode(inode, sattr);
2253         return status;
2254 }
2255
2256 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2257                 const struct qstr *name, struct nfs_fh *fhandle,
2258                 struct nfs_fattr *fattr)
2259 {
2260         int                    status;
2261         struct nfs4_lookup_arg args = {
2262                 .bitmask = server->attr_bitmask,
2263                 .dir_fh = dirfh,
2264                 .name = name,
2265         };
2266         struct nfs4_lookup_res res = {
2267                 .server = server,
2268                 .fattr = fattr,
2269                 .fh = fhandle,
2270         };
2271         struct rpc_message msg = {
2272                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2273                 .rpc_argp = &args,
2274                 .rpc_resp = &res,
2275         };
2276
2277         nfs_fattr_init(fattr);
2278
2279         dprintk("NFS call  lookupfh %s\n", name->name);
2280         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2281         dprintk("NFS reply lookupfh: %d\n", status);
2282         return status;
2283 }
2284
2285 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2286                               struct qstr *name, struct nfs_fh *fhandle,
2287                               struct nfs_fattr *fattr)
2288 {
2289         struct nfs4_exception exception = { };
2290         int err;
2291         do {
2292                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2293                 /* FIXME: !!!! */
2294                 if (err == -NFS4ERR_MOVED) {
2295                         err = -EREMOTE;
2296                         break;
2297                 }
2298                 err = nfs4_handle_exception(server, err, &exception);
2299         } while (exception.retry);
2300         return err;
2301 }
2302
2303 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2304                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2305 {
2306         int status;
2307
2308         dprintk("NFS call  lookup %s\n", name->name);
2309         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2310         if (status == -NFS4ERR_MOVED)
2311                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2312         dprintk("NFS reply lookup: %d\n", status);
2313         return status;
2314 }
2315
2316 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2317 {
2318         struct nfs4_exception exception = { };
2319         int err;
2320         do {
2321                 err = nfs4_handle_exception(NFS_SERVER(dir),
2322                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2323                                 &exception);
2324         } while (exception.retry);
2325         return err;
2326 }
2327
2328 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2329 {
2330         struct nfs_server *server = NFS_SERVER(inode);
2331         struct nfs4_accessargs args = {
2332                 .fh = NFS_FH(inode),
2333                 .bitmask = server->attr_bitmask,
2334         };
2335         struct nfs4_accessres res = {
2336                 .server = server,
2337         };
2338         struct rpc_message msg = {
2339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2340                 .rpc_argp = &args,
2341                 .rpc_resp = &res,
2342                 .rpc_cred = entry->cred,
2343         };
2344         int mode = entry->mask;
2345         int status;
2346
2347         /*
2348          * Determine which access bits we want to ask for...
2349          */
2350         if (mode & MAY_READ)
2351                 args.access |= NFS4_ACCESS_READ;
2352         if (S_ISDIR(inode->i_mode)) {
2353                 if (mode & MAY_WRITE)
2354                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2355                 if (mode & MAY_EXEC)
2356                         args.access |= NFS4_ACCESS_LOOKUP;
2357         } else {
2358                 if (mode & MAY_WRITE)
2359                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2360                 if (mode & MAY_EXEC)
2361                         args.access |= NFS4_ACCESS_EXECUTE;
2362         }
2363
2364         res.fattr = nfs_alloc_fattr();
2365         if (res.fattr == NULL)
2366                 return -ENOMEM;
2367
2368         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2369         if (!status) {
2370                 entry->mask = 0;
2371                 if (res.access & NFS4_ACCESS_READ)
2372                         entry->mask |= MAY_READ;
2373                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2374                         entry->mask |= MAY_WRITE;
2375                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2376                         entry->mask |= MAY_EXEC;
2377                 nfs_refresh_inode(inode, res.fattr);
2378         }
2379         nfs_free_fattr(res.fattr);
2380         return status;
2381 }
2382
2383 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2384 {
2385         struct nfs4_exception exception = { };
2386         int err;
2387         do {
2388                 err = nfs4_handle_exception(NFS_SERVER(inode),
2389                                 _nfs4_proc_access(inode, entry),
2390                                 &exception);
2391         } while (exception.retry);
2392         return err;
2393 }
2394
2395 /*
2396  * TODO: For the time being, we don't try to get any attributes
2397  * along with any of the zero-copy operations READ, READDIR,
2398  * READLINK, WRITE.
2399  *
2400  * In the case of the first three, we want to put the GETATTR
2401  * after the read-type operation -- this is because it is hard
2402  * to predict the length of a GETATTR response in v4, and thus
2403  * align the READ data correctly.  This means that the GETATTR
2404  * may end up partially falling into the page cache, and we should
2405  * shift it into the 'tail' of the xdr_buf before processing.
2406  * To do this efficiently, we need to know the total length
2407  * of data received, which doesn't seem to be available outside
2408  * of the RPC layer.
2409  *
2410  * In the case of WRITE, we also want to put the GETATTR after
2411  * the operation -- in this case because we want to make sure
2412  * we get the post-operation mtime and size.  This means that
2413  * we can't use xdr_encode_pages() as written: we need a variant
2414  * of it which would leave room in the 'tail' iovec.
2415  *
2416  * Both of these changes to the XDR layer would in fact be quite
2417  * minor, but I decided to leave them for a subsequent patch.
2418  */
2419 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2420                 unsigned int pgbase, unsigned int pglen)
2421 {
2422         struct nfs4_readlink args = {
2423                 .fh       = NFS_FH(inode),
2424                 .pgbase   = pgbase,
2425                 .pglen    = pglen,
2426                 .pages    = &page,
2427         };
2428         struct nfs4_readlink_res res;
2429         struct rpc_message msg = {
2430                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2431                 .rpc_argp = &args,
2432                 .rpc_resp = &res,
2433         };
2434
2435         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2436 }
2437
2438 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2439                 unsigned int pgbase, unsigned int pglen)
2440 {
2441         struct nfs4_exception exception = { };
2442         int err;
2443         do {
2444                 err = nfs4_handle_exception(NFS_SERVER(inode),
2445                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2446                                 &exception);
2447         } while (exception.retry);
2448         return err;
2449 }
2450
2451 /*
2452  * Got race?
2453  * We will need to arrange for the VFS layer to provide an atomic open.
2454  * Until then, this create/open method is prone to inefficiency and race
2455  * conditions due to the lookup, create, and open VFS calls from sys_open()
2456  * placed on the wire.
2457  *
2458  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2459  * The file will be opened again in the subsequent VFS open call
2460  * (nfs4_proc_file_open).
2461  *
2462  * The open for read will just hang around to be used by any process that
2463  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2464  */
2465
2466 static int
2467 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2468                  int flags, struct nfs_open_context *ctx)
2469 {
2470         struct path my_path = {
2471                 .dentry = dentry,
2472         };
2473         struct path *path = &my_path;
2474         struct nfs4_state *state;
2475         struct rpc_cred *cred = NULL;
2476         fmode_t fmode = 0;
2477         int status = 0;
2478
2479         if (ctx != NULL) {
2480                 cred = ctx->cred;
2481                 path = &ctx->path;
2482                 fmode = ctx->mode;
2483         }
2484         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2485         d_drop(dentry);
2486         if (IS_ERR(state)) {
2487                 status = PTR_ERR(state);
2488                 goto out;
2489         }
2490         d_add(dentry, igrab(state->inode));
2491         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2492         if (ctx != NULL)
2493                 ctx->state = state;
2494         else
2495                 nfs4_close_sync(path, state, fmode);
2496 out:
2497         return status;
2498 }
2499
2500 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2501 {
2502         struct nfs_server *server = NFS_SERVER(dir);
2503         struct nfs_removeargs args = {
2504                 .fh = NFS_FH(dir),
2505                 .name.len = name->len,
2506                 .name.name = name->name,
2507                 .bitmask = server->attr_bitmask,
2508         };
2509         struct nfs_removeres res = {
2510                 .server = server,
2511         };
2512         struct rpc_message msg = {
2513                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2514                 .rpc_argp = &args,
2515                 .rpc_resp = &res,
2516         };
2517         int status = -ENOMEM;
2518
2519         res.dir_attr = nfs_alloc_fattr();
2520         if (res.dir_attr == NULL)
2521                 goto out;
2522
2523         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2524         if (status == 0) {
2525                 update_changeattr(dir, &res.cinfo);
2526                 nfs_post_op_update_inode(dir, res.dir_attr);
2527         }
2528         nfs_free_fattr(res.dir_attr);
2529 out:
2530         return status;
2531 }
2532
2533 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2534 {
2535         struct nfs4_exception exception = { };
2536         int err;
2537         do {
2538                 err = nfs4_handle_exception(NFS_SERVER(dir),
2539                                 _nfs4_proc_remove(dir, name),
2540                                 &exception);
2541         } while (exception.retry);
2542         return err;
2543 }
2544
2545 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2546 {
2547         struct nfs_server *server = NFS_SERVER(dir);
2548         struct nfs_removeargs *args = msg->rpc_argp;
2549         struct nfs_removeres *res = msg->rpc_resp;
2550
2551         args->bitmask = server->cache_consistency_bitmask;
2552         res->server = server;
2553         res->seq_res.sr_slot = NULL;
2554         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2555 }
2556
2557 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2558 {
2559         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2560
2561         if (!nfs4_sequence_done(task, &res->seq_res))
2562                 return 0;
2563         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2564                 return 0;
2565         update_changeattr(dir, &res->cinfo);
2566         nfs_post_op_update_inode(dir, res->dir_attr);
2567         return 1;
2568 }
2569
2570 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2571 {
2572         struct nfs_server *server = NFS_SERVER(dir);
2573         struct nfs_renameargs *arg = msg->rpc_argp;
2574         struct nfs_renameres *res = msg->rpc_resp;
2575
2576         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2577         arg->bitmask = server->attr_bitmask;
2578         res->server = server;
2579 }
2580
2581 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2582                                  struct inode *new_dir)
2583 {
2584         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2585
2586         if (!nfs4_sequence_done(task, &res->seq_res))
2587                 return 0;
2588         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2589                 return 0;
2590
2591         update_changeattr(old_dir, &res->old_cinfo);
2592         nfs_post_op_update_inode(old_dir, res->old_fattr);
2593         update_changeattr(new_dir, &res->new_cinfo);
2594         nfs_post_op_update_inode(new_dir, res->new_fattr);
2595         return 1;
2596 }
2597
2598 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2599                 struct inode *new_dir, struct qstr *new_name)
2600 {
2601         struct nfs_server *server = NFS_SERVER(old_dir);
2602         struct nfs_renameargs arg = {
2603                 .old_dir = NFS_FH(old_dir),
2604                 .new_dir = NFS_FH(new_dir),
2605                 .old_name = old_name,
2606                 .new_name = new_name,
2607                 .bitmask = server->attr_bitmask,
2608         };
2609         struct nfs_renameres res = {
2610                 .server = server,
2611         };
2612         struct rpc_message msg = {
2613                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2614                 .rpc_argp = &arg,
2615                 .rpc_resp = &res,
2616         };
2617         int status = -ENOMEM;
2618
2619         res.old_fattr = nfs_alloc_fattr();
2620         res.new_fattr = nfs_alloc_fattr();
2621         if (res.old_fattr == NULL || res.new_fattr == NULL)
2622                 goto out;
2623
2624         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2625         if (!status) {
2626                 update_changeattr(old_dir, &res.old_cinfo);
2627                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2628                 update_changeattr(new_dir, &res.new_cinfo);
2629                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2630         }
2631 out:
2632         nfs_free_fattr(res.new_fattr);
2633         nfs_free_fattr(res.old_fattr);
2634         return status;
2635 }
2636
2637 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2638                 struct inode *new_dir, struct qstr *new_name)
2639 {
2640         struct nfs4_exception exception = { };
2641         int err;
2642         do {
2643                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2644                                 _nfs4_proc_rename(old_dir, old_name,
2645                                         new_dir, new_name),
2646                                 &exception);
2647         } while (exception.retry);
2648         return err;
2649 }
2650
2651 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2652 {
2653         struct nfs_server *server = NFS_SERVER(inode);
2654         struct nfs4_link_arg arg = {
2655                 .fh     = NFS_FH(inode),
2656                 .dir_fh = NFS_FH(dir),
2657                 .name   = name,
2658                 .bitmask = server->attr_bitmask,
2659         };
2660         struct nfs4_link_res res = {
2661                 .server = server,
2662         };
2663         struct rpc_message msg = {
2664                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2665                 .rpc_argp = &arg,
2666                 .rpc_resp = &res,
2667         };
2668         int status = -ENOMEM;
2669
2670         res.fattr = nfs_alloc_fattr();
2671         res.dir_attr = nfs_alloc_fattr();
2672         if (res.fattr == NULL || res.dir_attr == NULL)
2673                 goto out;
2674
2675         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2676         if (!status) {
2677                 update_changeattr(dir, &res.cinfo);
2678                 nfs_post_op_update_inode(dir, res.dir_attr);
2679                 nfs_post_op_update_inode(inode, res.fattr);
2680         }
2681 out:
2682         nfs_free_fattr(res.dir_attr);
2683         nfs_free_fattr(res.fattr);
2684         return status;
2685 }
2686
2687 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2688 {
2689         struct nfs4_exception exception = { };
2690         int err;
2691         do {
2692                 err = nfs4_handle_exception(NFS_SERVER(inode),
2693                                 _nfs4_proc_link(inode, dir, name),
2694                                 &exception);
2695         } while (exception.retry);
2696         return err;
2697 }
2698
2699 struct nfs4_createdata {
2700         struct rpc_message msg;
2701         struct nfs4_create_arg arg;
2702         struct nfs4_create_res res;
2703         struct nfs_fh fh;
2704         struct nfs_fattr fattr;
2705         struct nfs_fattr dir_fattr;
2706 };
2707
2708 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2709                 struct qstr *name, struct iattr *sattr, u32 ftype)
2710 {
2711         struct nfs4_createdata *data;
2712
2713         data = kzalloc(sizeof(*data), GFP_KERNEL);
2714         if (data != NULL) {
2715                 struct nfs_server *server = NFS_SERVER(dir);
2716
2717                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2718                 data->msg.rpc_argp = &data->arg;
2719                 data->msg.rpc_resp = &data->res;
2720                 data->arg.dir_fh = NFS_FH(dir);
2721                 data->arg.server = server;
2722                 data->arg.name = name;
2723                 data->arg.attrs = sattr;
2724                 data->arg.ftype = ftype;
2725                 data->arg.bitmask = server->attr_bitmask;
2726                 data->res.server = server;
2727                 data->res.fh = &data->fh;
2728                 data->res.fattr = &data->fattr;
2729                 data->res.dir_fattr = &data->dir_fattr;
2730                 nfs_fattr_init(data->res.fattr);
2731                 nfs_fattr_init(data->res.dir_fattr);
2732         }
2733         return data;
2734 }
2735
2736 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2737 {
2738         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2739                                     &data->arg, &data->res, 1);
2740         if (status == 0) {
2741                 update_changeattr(dir, &data->res.dir_cinfo);
2742                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2743                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2744         }
2745         return status;
2746 }
2747
2748 static void nfs4_free_createdata(struct nfs4_createdata *data)
2749 {
2750         kfree(data);
2751 }
2752
2753 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2754                 struct page *page, unsigned int len, struct iattr *sattr)
2755 {
2756         struct nfs4_createdata *data;
2757         int status = -ENAMETOOLONG;
2758
2759         if (len > NFS4_MAXPATHLEN)
2760                 goto out;
2761
2762         status = -ENOMEM;
2763         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2764         if (data == NULL)
2765                 goto out;
2766
2767         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2768         data->arg.u.symlink.pages = &page;
2769         data->arg.u.symlink.len = len;
2770
2771         status = nfs4_do_create(dir, dentry, data);
2772
2773         nfs4_free_createdata(data);
2774 out:
2775         return status;
2776 }
2777
2778 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2779                 struct page *page, unsigned int len, struct iattr *sattr)
2780 {
2781         struct nfs4_exception exception = { };
2782         int err;
2783         do {
2784                 err = nfs4_handle_exception(NFS_SERVER(dir),
2785                                 _nfs4_proc_symlink(dir, dentry, page,
2786                                                         len, sattr),
2787                                 &exception);
2788         } while (exception.retry);
2789         return err;
2790 }
2791
2792 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2793                 struct iattr *sattr)
2794 {
2795         struct nfs4_createdata *data;
2796         int status = -ENOMEM;
2797
2798         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2799         if (data == NULL)
2800                 goto out;
2801
2802         status = nfs4_do_create(dir, dentry, data);
2803
2804         nfs4_free_createdata(data);
2805 out:
2806         return status;
2807 }
2808
2809 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2810                 struct iattr *sattr)
2811 {
2812         struct nfs4_exception exception = { };
2813         int err;
2814         do {
2815                 err = nfs4_handle_exception(NFS_SERVER(dir),
2816                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2817                                 &exception);
2818         } while (exception.retry);
2819         return err;
2820 }
2821
2822 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2823                   u64 cookie, struct page *page, unsigned int count, int plus)
2824 {
2825         struct inode            *dir = dentry->d_inode;
2826         struct nfs4_readdir_arg args = {
2827                 .fh = NFS_FH(dir),
2828                 .pages = &page,
2829                 .pgbase = 0,
2830                 .count = count,
2831                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2832         };
2833         struct nfs4_readdir_res res;
2834         struct rpc_message msg = {
2835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2836                 .rpc_argp = &args,
2837                 .rpc_resp = &res,
2838                 .rpc_cred = cred,
2839         };
2840         int                     status;
2841
2842         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2843                         dentry->d_parent->d_name.name,
2844                         dentry->d_name.name,
2845                         (unsigned long long)cookie);
2846         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2847         res.pgbase = args.pgbase;
2848         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2849         if (status == 0)
2850                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2851
2852         nfs_invalidate_atime(dir);
2853
2854         dprintk("%s: returns %d\n", __func__, status);
2855         return status;
2856 }
2857
2858 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2859                   u64 cookie, struct page *page, unsigned int count, int plus)
2860 {
2861         struct nfs4_exception exception = { };
2862         int err;
2863         do {
2864                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2865                                 _nfs4_proc_readdir(dentry, cred, cookie,
2866                                         page, count, plus),
2867                                 &exception);
2868         } while (exception.retry);
2869         return err;
2870 }
2871
2872 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2873                 struct iattr *sattr, dev_t rdev)
2874 {
2875         struct nfs4_createdata *data;
2876         int mode = sattr->ia_mode;
2877         int status = -ENOMEM;
2878
2879         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2880         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2881
2882         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2883         if (data == NULL)
2884                 goto out;
2885
2886         if (S_ISFIFO(mode))
2887                 data->arg.ftype = NF4FIFO;
2888         else if (S_ISBLK(mode)) {
2889                 data->arg.ftype = NF4BLK;
2890                 data->arg.u.device.specdata1 = MAJOR(rdev);
2891                 data->arg.u.device.specdata2 = MINOR(rdev);
2892         }
2893         else if (S_ISCHR(mode)) {
2894                 data->arg.ftype = NF4CHR;
2895                 data->arg.u.device.specdata1 = MAJOR(rdev);
2896                 data->arg.u.device.specdata2 = MINOR(rdev);
2897         }
2898
2899         status = nfs4_do_create(dir, dentry, data);
2900
2901         nfs4_free_createdata(data);
2902 out:
2903         return status;
2904 }
2905
2906 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2907                 struct iattr *sattr, dev_t rdev)
2908 {
2909         struct nfs4_exception exception = { };
2910         int err;
2911         do {
2912                 err = nfs4_handle_exception(NFS_SERVER(dir),
2913                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2914                                 &exception);
2915         } while (exception.retry);
2916         return err;
2917 }
2918
2919 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2920                  struct nfs_fsstat *fsstat)
2921 {
2922         struct nfs4_statfs_arg args = {
2923                 .fh = fhandle,
2924                 .bitmask = server->attr_bitmask,
2925         };
2926         struct nfs4_statfs_res res = {
2927                 .fsstat = fsstat,
2928         };
2929         struct rpc_message msg = {
2930                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2931                 .rpc_argp = &args,
2932                 .rpc_resp = &res,
2933         };
2934
2935         nfs_fattr_init(fsstat->fattr);
2936         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2937 }
2938
2939 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2940 {
2941         struct nfs4_exception exception = { };
2942         int err;
2943         do {
2944                 err = nfs4_handle_exception(server,
2945                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2946                                 &exception);
2947         } while (exception.retry);
2948         return err;
2949 }
2950
2951 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2952                 struct nfs_fsinfo *fsinfo)
2953 {
2954         struct nfs4_fsinfo_arg args = {
2955                 .fh = fhandle,
2956                 .bitmask = server->attr_bitmask,
2957         };
2958         struct nfs4_fsinfo_res res = {
2959                 .fsinfo = fsinfo,
2960         };
2961         struct rpc_message msg = {
2962                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2963                 .rpc_argp = &args,
2964                 .rpc_resp = &res,
2965         };
2966
2967         return nfs4_call_sync(server, &msg, &args, &res, 0);
2968 }
2969
2970 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2971 {
2972         struct nfs4_exception exception = { };
2973         int err;
2974
2975         do {
2976                 err = nfs4_handle_exception(server,
2977                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2978                                 &exception);
2979         } while (exception.retry);
2980         return err;
2981 }
2982
2983 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2984 {
2985         nfs_fattr_init(fsinfo->fattr);
2986         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2987 }
2988
2989 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2990                 struct nfs_pathconf *pathconf)
2991 {
2992         struct nfs4_pathconf_arg args = {
2993                 .fh = fhandle,
2994                 .bitmask = server->attr_bitmask,
2995         };
2996         struct nfs4_pathconf_res res = {
2997                 .pathconf = pathconf,
2998         };
2999         struct rpc_message msg = {
3000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3001                 .rpc_argp = &args,
3002                 .rpc_resp = &res,
3003         };
3004
3005         /* None of the pathconf attributes are mandatory to implement */
3006         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3007                 memset(pathconf, 0, sizeof(*pathconf));
3008                 return 0;
3009         }
3010
3011         nfs_fattr_init(pathconf->fattr);
3012         return nfs4_call_sync(server, &msg, &args, &res, 0);
3013 }
3014
3015 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3016                 struct nfs_pathconf *pathconf)
3017 {
3018         struct nfs4_exception exception = { };
3019         int err;
3020
3021         do {
3022                 err = nfs4_handle_exception(server,
3023                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3024                                 &exception);
3025         } while (exception.retry);
3026         return err;
3027 }
3028
3029 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3030 {
3031         struct nfs_server *server = NFS_SERVER(data->inode);
3032
3033         dprintk("--> %s\n", __func__);
3034
3035         if (!nfs4_sequence_done(task, &data->res.seq_res))
3036                 return -EAGAIN;
3037
3038         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3039                 nfs_restart_rpc(task, server->nfs_client);
3040                 return -EAGAIN;
3041         }
3042
3043         nfs_invalidate_atime(data->inode);
3044         if (task->tk_status > 0)
3045                 renew_lease(server, data->timestamp);
3046         return 0;
3047 }
3048
3049 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3050 {
3051         data->timestamp   = jiffies;
3052         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3053 }
3054
3055 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3056 {
3057         struct inode *inode = data->inode;
3058
3059         if (!nfs4_sequence_done(task, &data->res.seq_res))
3060                 return -EAGAIN;
3061
3062         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3063                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3064                 return -EAGAIN;
3065         }
3066         if (task->tk_status >= 0) {
3067                 renew_lease(NFS_SERVER(inode), data->timestamp);
3068                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3069         }
3070         return 0;
3071 }
3072
3073 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3074 {
3075         struct nfs_server *server = NFS_SERVER(data->inode);
3076
3077         data->args.bitmask = server->cache_consistency_bitmask;
3078         data->res.server = server;
3079         data->timestamp   = jiffies;
3080
3081         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3082 }
3083
3084 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3085 {
3086         struct inode *inode = data->inode;
3087
3088         if (!nfs4_sequence_done(task, &data->res.seq_res))
3089                 return -EAGAIN;
3090
3091         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3092                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3093                 return -EAGAIN;
3094         }
3095         nfs_refresh_inode(inode, data->res.fattr);
3096         return 0;
3097 }
3098
3099 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3100 {
3101         struct nfs_server *server = NFS_SERVER(data->inode);
3102
3103         data->args.bitmask = server->cache_consistency_bitmask;
3104         data->res.server = server;
3105         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3106 }
3107
3108 struct nfs4_renewdata {
3109         struct nfs_client       *client;
3110         unsigned long           timestamp;
3111 };
3112
3113 /*
3114  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3115  * standalone procedure for queueing an asynchronous RENEW.
3116  */
3117 static void nfs4_renew_release(void *calldata)
3118 {
3119         struct nfs4_renewdata *data = calldata;
3120         struct nfs_client *clp = data->client;
3121
3122         if (atomic_read(&clp->cl_count) > 1)
3123                 nfs4_schedule_state_renewal(clp);
3124         nfs_put_client(clp);
3125         kfree(data);
3126 }
3127
3128 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3129 {
3130         struct nfs4_renewdata *data = calldata;
3131         struct nfs_client *clp = data->client;
3132         unsigned long timestamp = data->timestamp;
3133
3134         if (task->tk_status < 0) {
3135                 /* Unless we're shutting down, schedule state recovery! */
3136                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3137                         nfs4_schedule_state_recovery(clp);
3138                 return;
3139         }
3140         do_renew_lease(clp, timestamp);
3141 }
3142
3143 static const struct rpc_call_ops nfs4_renew_ops = {
3144         .rpc_call_done = nfs4_renew_done,
3145         .rpc_release = nfs4_renew_release,
3146 };
3147
3148 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3149 {
3150         struct rpc_message msg = {
3151                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3152                 .rpc_argp       = clp,
3153                 .rpc_cred       = cred,
3154         };
3155         struct nfs4_renewdata *data;
3156
3157         if (!atomic_inc_not_zero(&clp->cl_count))
3158                 return -EIO;
3159         data = kmalloc(sizeof(*data), GFP_KERNEL);
3160         if (data == NULL)
3161                 return -ENOMEM;
3162         data->client = clp;
3163         data->timestamp = jiffies;
3164         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3165                         &nfs4_renew_ops, data);
3166 }
3167
3168 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3169 {
3170         struct rpc_message msg = {
3171                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3172                 .rpc_argp       = clp,
3173                 .rpc_cred       = cred,
3174         };
3175         unsigned long now = jiffies;
3176         int status;
3177
3178         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3179         if (status < 0)
3180                 return status;
3181         do_renew_lease(clp, now);
3182         return 0;
3183 }
3184
3185 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3186 {
3187         return (server->caps & NFS_CAP_ACLS)
3188                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3189                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3190 }
3191
3192 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3193  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3194  * the stack.
3195  */
3196 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3197
3198 static void buf_to_pages(const void *buf, size_t buflen,
3199                 struct page **pages, unsigned int *pgbase)
3200 {
3201         const void *p = buf;
3202
3203         *pgbase = offset_in_page(buf);
3204         p -= *pgbase;
3205         while (p < buf + buflen) {
3206                 *(pages++) = virt_to_page(p);
3207                 p += PAGE_CACHE_SIZE;
3208         }
3209 }
3210
3211 struct nfs4_cached_acl {
3212         int cached;
3213         size_t len;
3214         char data[0];
3215 };
3216
3217 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3218 {
3219         struct nfs_inode *nfsi = NFS_I(inode);
3220
3221         spin_lock(&inode->i_lock);
3222         kfree(nfsi->nfs4_acl);
3223         nfsi->nfs4_acl = acl;
3224         spin_unlock(&inode->i_lock);
3225 }
3226
3227 static void nfs4_zap_acl_attr(struct inode *inode)
3228 {
3229         nfs4_set_cached_acl(inode, NULL);
3230 }
3231
3232 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3233 {
3234         struct nfs_inode *nfsi = NFS_I(inode);
3235         struct nfs4_cached_acl *acl;
3236         int ret = -ENOENT;
3237
3238         spin_lock(&inode->i_lock);
3239         acl = nfsi->nfs4_acl;
3240         if (acl == NULL)
3241                 goto out;
3242         if (buf == NULL) /* user is just asking for length */
3243                 goto out_len;
3244         if (acl->cached == 0)
3245                 goto out;
3246         ret = -ERANGE; /* see getxattr(2) man page */
3247         if (acl->len > buflen)
3248                 goto out;
3249         memcpy(buf, acl->data, acl->len);
3250 out_len:
3251         ret = acl->len;
3252 out:
3253         spin_unlock(&inode->i_lock);
3254         return ret;
3255 }
3256
3257 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3258 {
3259         struct nfs4_cached_acl *acl;
3260
3261         if (buf && acl_len <= PAGE_SIZE) {
3262                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3263                 if (acl == NULL)
3264                         goto out;
3265                 acl->cached = 1;
3266                 memcpy(acl->data, buf, acl_len);
3267         } else {
3268                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3269                 if (acl == NULL)
3270                         goto out;
3271                 acl->cached = 0;
3272         }
3273         acl->len = acl_len;
3274 out:
3275         nfs4_set_cached_acl(inode, acl);
3276 }
3277
3278 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3279 {
3280         struct page *pages[NFS4ACL_MAXPAGES];
3281         struct nfs_getaclargs args = {
3282                 .fh = NFS_FH(inode),
3283                 .acl_pages = pages,
3284                 .acl_len = buflen,
3285         };
3286         struct nfs_getaclres res = {
3287                 .acl_len = buflen,
3288         };
3289         void *resp_buf;
3290         struct rpc_message msg = {
3291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3292                 .rpc_argp = &args,
3293                 .rpc_resp = &res,
3294         };
3295         struct page *localpage = NULL;
3296         int ret;
3297
3298         if (buflen < PAGE_SIZE) {
3299                 /* As long as we're doing a round trip to the server anyway,
3300                  * let's be prepared for a page of acl data. */
3301                 localpage = alloc_page(GFP_KERNEL);
3302                 resp_buf = page_address(localpage);
3303                 if (localpage == NULL)
3304                         return -ENOMEM;
3305                 args.acl_pages[0] = localpage;
3306                 args.acl_pgbase = 0;
3307                 args.acl_len = PAGE_SIZE;
3308         } else {
3309                 resp_buf = buf;
3310                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3311         }
3312         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3313         if (ret)
3314                 goto out_free;
3315         if (res.acl_len > args.acl_len)
3316                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3317         else
3318                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3319         if (buf) {
3320                 ret = -ERANGE;
3321                 if (res.acl_len > buflen)
3322                         goto out_free;
3323                 if (localpage)
3324                         memcpy(buf, resp_buf, res.acl_len);
3325         }
3326         ret = res.acl_len;
3327 out_free:
3328         if (localpage)
3329                 __free_page(localpage);
3330         return ret;
3331 }
3332
3333 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3334 {
3335         struct nfs4_exception exception = { };
3336         ssize_t ret;
3337         do {
3338                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3339                 if (ret >= 0)
3340                         break;
3341                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3342         } while (exception.retry);
3343         return ret;
3344 }
3345
3346 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3347 {
3348         struct nfs_server *server = NFS_SERVER(inode);
3349         int ret;
3350
3351         if (!nfs4_server_supports_acls(server))
3352                 return -EOPNOTSUPP;
3353         ret = nfs_revalidate_inode(server, inode);
3354         if (ret < 0)
3355                 return ret;
3356         ret = nfs4_read_cached_acl(inode, buf, buflen);
3357         if (ret != -ENOENT)
3358                 return ret;
3359         return nfs4_get_acl_uncached(inode, buf, buflen);
3360 }
3361
3362 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3363 {
3364         struct nfs_server *server = NFS_SERVER(inode);
3365         struct page *pages[NFS4ACL_MAXPAGES];
3366         struct nfs_setaclargs arg = {
3367                 .fh             = NFS_FH(inode),
3368                 .acl_pages      = pages,
3369                 .acl_len        = buflen,
3370         };
3371         struct nfs_setaclres res;
3372         struct rpc_message msg = {
3373                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3374                 .rpc_argp       = &arg,
3375                 .rpc_resp       = &res,
3376         };
3377         int ret;
3378
3379         if (!nfs4_server_supports_acls(server))
3380                 return -EOPNOTSUPP;
3381         nfs_inode_return_delegation(inode);
3382         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3383         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3384         nfs_access_zap_cache(inode);
3385         nfs_zap_acl_cache(inode);
3386         return ret;
3387 }
3388
3389 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3390 {
3391         struct nfs4_exception exception = { };
3392         int err;
3393         do {
3394                 err = nfs4_handle_exception(NFS_SERVER(inode),
3395                                 __nfs4_proc_set_acl(inode, buf, buflen),
3396                                 &exception);
3397         } while (exception.retry);
3398         return err;
3399 }
3400
3401 static int
3402 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3403 {
3404         struct nfs_client *clp = server->nfs_client;
3405
3406         if (task->tk_status >= 0)
3407                 return 0;
3408         switch(task->tk_status) {
3409                 case -NFS4ERR_ADMIN_REVOKED:
3410                 case -NFS4ERR_BAD_STATEID:
3411                 case -NFS4ERR_OPENMODE:
3412                         if (state == NULL)
3413                                 break;
3414                         nfs4_state_mark_reclaim_nograce(clp, state);
3415                         goto do_state_recovery;
3416                 case -NFS4ERR_STALE_STATEID:
3417                         if (state == NULL)
3418                                 break;
3419                         nfs4_state_mark_reclaim_reboot(clp, state);
3420                 case -NFS4ERR_STALE_CLIENTID:
3421                 case -NFS4ERR_EXPIRED:
3422                         goto do_state_recovery;
3423 #if defined(CONFIG_NFS_V4_1)
3424                 case -NFS4ERR_BADSESSION:
3425                 case -NFS4ERR_BADSLOT:
3426                 case -NFS4ERR_BAD_HIGH_SLOT:
3427                 case -NFS4ERR_DEADSESSION:
3428                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3429                 case -NFS4ERR_SEQ_FALSE_RETRY:
3430                 case -NFS4ERR_SEQ_MISORDERED:
3431                         dprintk("%s ERROR %d, Reset session\n", __func__,
3432                                 task->tk_status);
3433                         nfs4_schedule_state_recovery(clp);
3434                         task->tk_status = 0;
3435                         return -EAGAIN;
3436 #endif /* CONFIG_NFS_V4_1 */
3437                 case -NFS4ERR_DELAY:
3438                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3439                 case -NFS4ERR_GRACE:
3440                 case -EKEYEXPIRED:
3441                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3442                         task->tk_status = 0;
3443                         return -EAGAIN;
3444                 case -NFS4ERR_OLD_STATEID:
3445                         task->tk_status = 0;
3446                         return -EAGAIN;
3447         }
3448         task->tk_status = nfs4_map_errors(task->tk_status);
3449         return 0;
3450 do_state_recovery:
3451         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3452         nfs4_schedule_state_recovery(clp);
3453         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3454                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3455         task->tk_status = 0;
3456         return -EAGAIN;
3457 }
3458
3459 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3460                 unsigned short port, struct rpc_cred *cred,
3461                 struct nfs4_setclientid_res *res)
3462 {
3463         nfs4_verifier sc_verifier;
3464         struct nfs4_setclientid setclientid = {
3465                 .sc_verifier = &sc_verifier,
3466                 .sc_prog = program,
3467         };
3468         struct rpc_message msg = {
3469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3470                 .rpc_argp = &setclientid,
3471                 .rpc_resp = res,
3472                 .rpc_cred = cred,
3473         };
3474         __be32 *p;
3475         int loop = 0;
3476         int status;
3477
3478         p = (__be32*)sc_verifier.data;
3479         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3480         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3481
3482         for(;;) {
3483                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3484                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3485                                 clp->cl_ipaddr,
3486                                 rpc_peeraddr2str(clp->cl_rpcclient,
3487                                                         RPC_DISPLAY_ADDR),
3488                                 rpc_peeraddr2str(clp->cl_rpcclient,
3489                                                         RPC_DISPLAY_PROTO),
3490                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3491                                 clp->cl_id_uniquifier);
3492                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3493                                 sizeof(setclientid.sc_netid),
3494                                 rpc_peeraddr2str(clp->cl_rpcclient,
3495                                                         RPC_DISPLAY_NETID));
3496                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3497                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3498                                 clp->cl_ipaddr, port >> 8, port & 255);
3499
3500                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3501                 if (status != -NFS4ERR_CLID_INUSE)
3502                         break;
3503                 if (signalled())
3504                         break;
3505                 if (loop++ & 1)
3506                         ssleep(clp->cl_lease_time + 1);
3507                 else
3508                         if (++clp->cl_id_uniquifier == 0)
3509                                 break;
3510         }
3511         return status;
3512 }
3513
3514 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3515                 struct nfs4_setclientid_res *arg,
3516                 struct rpc_cred *cred)
3517 {
3518         struct nfs_fsinfo fsinfo;
3519         struct rpc_message msg = {
3520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3521                 .rpc_argp = arg,
3522                 .rpc_resp = &fsinfo,
3523                 .rpc_cred = cred,
3524         };
3525         unsigned long now;
3526         int status;
3527
3528         now = jiffies;
3529         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3530         if (status == 0) {
3531                 spin_lock(&clp->cl_lock);
3532                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3533                 clp->cl_last_renewal = now;
3534                 spin_unlock(&clp->cl_lock);
3535         }
3536         return status;
3537 }
3538
3539 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3540                 struct nfs4_setclientid_res *arg,
3541                 struct rpc_cred *cred)
3542 {
3543         long timeout = 0;
3544         int err;
3545         do {
3546                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3547                 switch (err) {
3548                         case 0:
3549                                 return err;
3550                         case -NFS4ERR_RESOURCE:
3551                                 /* The IBM lawyers misread another document! */
3552                         case -NFS4ERR_DELAY:
3553                         case -EKEYEXPIRED:
3554                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3555                 }
3556         } while (err == 0);
3557         return err;
3558 }
3559
3560 struct nfs4_delegreturndata {
3561         struct nfs4_delegreturnargs args;
3562         struct nfs4_delegreturnres res;
3563         struct nfs_fh fh;
3564         nfs4_stateid stateid;
3565         unsigned long timestamp;
3566         struct nfs_fattr fattr;
3567         int rpc_status;
3568 };
3569
3570 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3571 {
3572         struct nfs4_delegreturndata *data = calldata;
3573
3574         if (!nfs4_sequence_done(task, &data->res.seq_res))
3575                 return;
3576
3577         switch (task->tk_status) {
3578         case -NFS4ERR_STALE_STATEID:
3579         case -NFS4ERR_EXPIRED:
3580         case 0:
3581                 renew_lease(data->res.server, data->timestamp);
3582                 break;
3583         default:
3584                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3585                                 -EAGAIN) {
3586                         nfs_restart_rpc(task, data->res.server->nfs_client);
3587                         return;
3588                 }
3589         }
3590         data->rpc_status = task->tk_status;
3591 }
3592
3593 static void nfs4_delegreturn_release(void *calldata)
3594 {
3595         kfree(calldata);
3596 }
3597
3598 #if defined(CONFIG_NFS_V4_1)
3599 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3600 {
3601         struct nfs4_delegreturndata *d_data;
3602
3603         d_data = (struct nfs4_delegreturndata *)data;
3604
3605         if (nfs4_setup_sequence(d_data->res.server,
3606                                 &d_data->args.seq_args,
3607                                 &d_data->res.seq_res, 1, task))
3608                 return;
3609         rpc_call_start(task);
3610 }
3611 #endif /* CONFIG_NFS_V4_1 */
3612
3613 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3614 #if defined(CONFIG_NFS_V4_1)
3615         .rpc_call_prepare = nfs4_delegreturn_prepare,
3616 #endif /* CONFIG_NFS_V4_1 */
3617         .rpc_call_done = nfs4_delegreturn_done,
3618         .rpc_release = nfs4_delegreturn_release,
3619 };
3620
3621 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3622 {
3623         struct nfs4_delegreturndata *data;
3624         struct nfs_server *server = NFS_SERVER(inode);
3625         struct rpc_task *task;
3626         struct rpc_message msg = {
3627                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3628                 .rpc_cred = cred,
3629         };
3630         struct rpc_task_setup task_setup_data = {
3631                 .rpc_client = server->client,
3632                 .rpc_message = &msg,
3633                 .callback_ops = &nfs4_delegreturn_ops,
3634                 .flags = RPC_TASK_ASYNC,
3635         };
3636         int status = 0;
3637
3638         data = kzalloc(sizeof(*data), GFP_NOFS);
3639         if (data == NULL)
3640                 return -ENOMEM;
3641         data->args.fhandle = &data->fh;
3642         data->args.stateid = &data->stateid;
3643         data->args.bitmask = server->attr_bitmask;
3644         nfs_copy_fh(&data->fh, NFS_FH(inode));
3645         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3646         data->res.fattr = &data->fattr;
3647         data->res.server = server;
3648         nfs_fattr_init(data->res.fattr);
3649         data->timestamp = jiffies;
3650         data->rpc_status = 0;
3651
3652         task_setup_data.callback_data = data;
3653         msg.rpc_argp = &data->args,
3654         msg.rpc_resp = &data->res,
3655         task = rpc_run_task(&task_setup_data);
3656         if (IS_ERR(task))
3657                 return PTR_ERR(task);
3658         if (!issync)
3659                 goto out;
3660         status = nfs4_wait_for_completion_rpc_task(task);
3661         if (status != 0)
3662                 goto out;
3663         status = data->rpc_status;
3664         if (status != 0)
3665                 goto out;
3666         nfs_refresh_inode(inode, &data->fattr);
3667 out:
3668         rpc_put_task(task);
3669         return status;
3670 }
3671
3672 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3673 {
3674         struct nfs_server *server = NFS_SERVER(inode);
3675         struct nfs4_exception exception = { };
3676         int err;
3677         do {
3678                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3679                 switch (err) {
3680                         case -NFS4ERR_STALE_STATEID:
3681                         case -NFS4ERR_EXPIRED:
3682                         case 0:
3683                                 return 0;
3684                 }
3685                 err = nfs4_handle_exception(server, err, &exception);
3686         } while (exception.retry);
3687         return err;
3688 }
3689
3690 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3691 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3692
3693 /*
3694  * sleep, with exponential backoff, and retry the LOCK operation.
3695  */
3696 static unsigned long
3697 nfs4_set_lock_task_retry(unsigned long timeout)
3698 {
3699         schedule_timeout_killable(timeout);
3700         timeout <<= 1;
3701         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3702                 return NFS4_LOCK_MAXTIMEOUT;
3703         return timeout;
3704 }
3705
3706 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3707 {
3708         struct inode *inode = state->inode;
3709         struct nfs_server *server = NFS_SERVER(inode);
3710         struct nfs_client *clp = server->nfs_client;
3711         struct nfs_lockt_args arg = {
3712                 .fh = NFS_FH(inode),
3713                 .fl = request,
3714         };
3715         struct nfs_lockt_res res = {
3716                 .denied = request,
3717         };
3718         struct rpc_message msg = {
3719                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3720                 .rpc_argp       = &arg,
3721                 .rpc_resp       = &res,
3722                 .rpc_cred       = state->owner->so_cred,
3723         };
3724         struct nfs4_lock_state *lsp;
3725         int status;
3726
3727         arg.lock_owner.clientid = clp->cl_clientid;
3728         status = nfs4_set_lock_state(state, request);
3729         if (status != 0)
3730                 goto out;
3731         lsp = request->fl_u.nfs4_fl.owner;
3732         arg.lock_owner.id = lsp->ls_id.id;
3733         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3734         switch (status) {
3735                 case 0:
3736                         request->fl_type = F_UNLCK;
3737                         break;
3738                 case -NFS4ERR_DENIED:
3739                         status = 0;
3740         }
3741         request->fl_ops->fl_release_private(request);
3742 out:
3743         return status;
3744 }
3745
3746 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3747 {
3748         struct nfs4_exception exception = { };
3749         int err;
3750
3751         do {
3752                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3753                                 _nfs4_proc_getlk(state, cmd, request),
3754                                 &exception);
3755         } while (exception.retry);
3756         return err;
3757 }
3758
3759 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3760 {
3761         int res = 0;
3762         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3763                 case FL_POSIX:
3764                         res = posix_lock_file_wait(file, fl);
3765                         break;
3766                 case FL_FLOCK:
3767                         res = flock_lock_file_wait(file, fl);
3768                         break;
3769                 default:
3770                         BUG();
3771         }
3772         return res;
3773 }
3774
3775 struct nfs4_unlockdata {
3776         struct nfs_locku_args arg;
3777         struct nfs_locku_res res;
3778         struct nfs4_lock_state *lsp;
3779         struct nfs_open_context *ctx;
3780         struct file_lock fl;
3781         const struct nfs_server *server;
3782         unsigned long timestamp;
3783 };
3784
3785 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3786                 struct nfs_open_context *ctx,
3787                 struct nfs4_lock_state *lsp,
3788                 struct nfs_seqid *seqid)
3789 {
3790         struct nfs4_unlockdata *p;
3791         struct inode *inode = lsp->ls_state->inode;
3792
3793         p = kzalloc(sizeof(*p), GFP_NOFS);
3794         if (p == NULL)
3795                 return NULL;
3796         p->arg.fh = NFS_FH(inode);
3797         p->arg.fl = &p->fl;
3798         p->arg.seqid = seqid;
3799         p->res.seqid = seqid;
3800         p->arg.stateid = &lsp->ls_stateid;
3801         p->lsp = lsp;
3802         atomic_inc(&lsp->ls_count);
3803         /* Ensure we don't close file until we're done freeing locks! */
3804         p->ctx = get_nfs_open_context(ctx);
3805         memcpy(&p->fl, fl, sizeof(p->fl));
3806         p->server = NFS_SERVER(inode);
3807         return p;
3808 }
3809
3810 static void nfs4_locku_release_calldata(void *data)
3811 {
3812         struct nfs4_unlockdata *calldata = data;
3813         nfs_free_seqid(calldata->arg.seqid);
3814         nfs4_put_lock_state(calldata->lsp);
3815         put_nfs_open_context(calldata->ctx);
3816         kfree(calldata);
3817 }
3818
3819 static void nfs4_locku_done(struct rpc_task *task, void *data)
3820 {
3821         struct nfs4_unlockdata *calldata = data;
3822
3823         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3824                 return;
3825         switch (task->tk_status) {
3826                 case 0:
3827                         memcpy(calldata->lsp->ls_stateid.data,
3828                                         calldata->res.stateid.data,
3829                                         sizeof(calldata->lsp->ls_stateid.data));
3830                         renew_lease(calldata->server, calldata->timestamp);
3831                         break;
3832                 case -NFS4ERR_BAD_STATEID:
3833                 case -NFS4ERR_OLD_STATEID:
3834                 case -NFS4ERR_STALE_STATEID:
3835                 case -NFS4ERR_EXPIRED:
3836                         break;
3837                 default:
3838                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3839                                 nfs_restart_rpc(task,
3840                                                  calldata->server->nfs_client);
3841         }
3842 }
3843
3844 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3845 {
3846         struct nfs4_unlockdata *calldata = data;
3847
3848         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3849                 return;
3850         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3851                 /* Note: exit _without_ running nfs4_locku_done */
3852                 task->tk_action = NULL;
3853                 return;
3854         }
3855         calldata->timestamp = jiffies;
3856         if (nfs4_setup_sequence(calldata->server,
3857                                 &calldata->arg.seq_args,
3858                                 &calldata->res.seq_res, 1, task))
3859                 return;
3860         rpc_call_start(task);
3861 }
3862
3863 static const struct rpc_call_ops nfs4_locku_ops = {
3864         .rpc_call_prepare = nfs4_locku_prepare,
3865         .rpc_call_done = nfs4_locku_done,
3866         .rpc_release = nfs4_locku_release_calldata,
3867 };
3868
3869 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3870                 struct nfs_open_context *ctx,
3871                 struct nfs4_lock_state *lsp,
3872                 struct nfs_seqid *seqid)
3873 {
3874         struct nfs4_unlockdata *data;
3875         struct rpc_message msg = {
3876                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3877                 .rpc_cred = ctx->cred,
3878         };
3879         struct rpc_task_setup task_setup_data = {
3880                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3881                 .rpc_message = &msg,
3882                 .callback_ops = &nfs4_locku_ops,
3883                 .workqueue = nfsiod_workqueue,
3884                 .flags = RPC_TASK_ASYNC,
3885         };
3886
3887         /* Ensure this is an unlock - when canceling a lock, the
3888          * canceled lock is passed in, and it won't be an unlock.
3889          */
3890         fl->fl_type = F_UNLCK;
3891
3892         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3893         if (data == NULL) {
3894                 nfs_free_seqid(seqid);
3895                 return ERR_PTR(-ENOMEM);
3896         }
3897
3898         msg.rpc_argp = &data->arg,
3899         msg.rpc_resp = &data->res,
3900         task_setup_data.callback_data = data;
3901         return rpc_run_task(&task_setup_data);
3902 }
3903
3904 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3905 {
3906         struct nfs_inode *nfsi = NFS_I(state->inode);
3907         struct nfs_seqid *seqid;
3908         struct nfs4_lock_state *lsp;
3909         struct rpc_task *task;
3910         int status = 0;
3911         unsigned char fl_flags = request->fl_flags;
3912
3913         status = nfs4_set_lock_state(state, request);
3914         /* Unlock _before_ we do the RPC call */
3915         request->fl_flags |= FL_EXISTS;
3916         down_read(&nfsi->rwsem);
3917         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3918                 up_read(&nfsi->rwsem);
3919                 goto out;
3920         }
3921         up_read(&nfsi->rwsem);
3922         if (status != 0)
3923                 goto out;
3924         /* Is this a delegated lock? */
3925         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3926                 goto out;
3927         lsp = request->fl_u.nfs4_fl.owner;
3928         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3929         status = -ENOMEM;
3930         if (seqid == NULL)
3931                 goto out;
3932         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3933         status = PTR_ERR(task);
3934         if (IS_ERR(task))
3935                 goto out;
3936         status = nfs4_wait_for_completion_rpc_task(task);
3937         rpc_put_task(task);
3938 out:
3939         request->fl_flags = fl_flags;
3940         return status;
3941 }
3942
3943 struct nfs4_lockdata {
3944         struct nfs_lock_args arg;
3945         struct nfs_lock_res res;
3946         struct nfs4_lock_state *lsp;
3947         struct nfs_open_context *ctx;
3948         struct file_lock fl;
3949         unsigned long timestamp;
3950         int rpc_status;
3951         int cancelled;
3952         struct nfs_server *server;
3953 };
3954
3955 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3956                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
3957                 gfp_t gfp_mask)
3958 {
3959         struct nfs4_lockdata *p;
3960         struct inode *inode = lsp->ls_state->inode;
3961         struct nfs_server *server = NFS_SERVER(inode);
3962
3963         p = kzalloc(sizeof(*p), gfp_mask);
3964         if (p == NULL)
3965                 return NULL;
3966
3967         p->arg.fh = NFS_FH(inode);
3968         p->arg.fl = &p->fl;
3969         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
3970         if (p->arg.open_seqid == NULL)
3971                 goto out_free;
3972         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
3973         if (p->arg.lock_seqid == NULL)
3974                 goto out_free_seqid;
3975         p->arg.lock_stateid = &lsp->ls_stateid;
3976         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3977         p->arg.lock_owner.id = lsp->ls_id.id;
3978         p->res.lock_seqid = p->arg.lock_seqid;
3979         p->lsp = lsp;
3980         p->server = server;
3981         atomic_inc(&lsp->ls_count);
3982         p->ctx = get_nfs_open_context(ctx);
3983         memcpy(&p->fl, fl, sizeof(p->fl));
3984         return p;
3985 out_free_seqid:
3986         nfs_free_seqid(p->arg.open_seqid);
3987 out_free:
3988         kfree(p);
3989         return NULL;
3990 }
3991
3992 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3993 {
3994         struct nfs4_lockdata *data = calldata;
3995         struct nfs4_state *state = data->lsp->ls_state;
3996
3997         dprintk("%s: begin!\n", __func__);
3998         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3999                 return;
4000         /* Do we need to do an open_to_lock_owner? */
4001         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4002                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4003                         return;
4004                 data->arg.open_stateid = &state->stateid;
4005                 data->arg.new_lock_owner = 1;
4006                 data->res.open_seqid = data->arg.open_seqid;
4007         } else
4008                 data->arg.new_lock_owner = 0;
4009         data->timestamp = jiffies;
4010         if (nfs4_setup_sequence(data->server,
4011                                 &data->arg.seq_args,
4012                                 &data->res.seq_res, 1, task))
4013                 return;
4014         rpc_call_start(task);
4015         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4016 }
4017
4018 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4019 {
4020         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4021         nfs4_lock_prepare(task, calldata);
4022 }
4023
4024 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4025 {
4026         struct nfs4_lockdata *data = calldata;
4027
4028         dprintk("%s: begin!\n", __func__);
4029
4030         if (!nfs4_sequence_done(task, &data->res.seq_res))
4031                 return;
4032
4033         data->rpc_status = task->tk_status;
4034         if (data->arg.new_lock_owner != 0) {
4035                 if (data->rpc_status == 0)
4036                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4037                 else
4038                         goto out;
4039         }
4040         if (data->rpc_status == 0) {
4041                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4042                                         sizeof(data->lsp->ls_stateid.data));
4043                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4044                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4045         }
4046 out:
4047         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4048 }
4049
4050 static void nfs4_lock_release(void *calldata)
4051 {
4052         struct nfs4_lockdata *data = calldata;
4053
4054         dprintk("%s: begin!\n", __func__);
4055         nfs_free_seqid(data->arg.open_seqid);
4056         if (data->cancelled != 0) {
4057                 struct rpc_task *task;
4058                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4059                                 data->arg.lock_seqid);
4060                 if (!IS_ERR(task))
4061                         rpc_put_task(task);
4062                 dprintk("%s: cancelling lock!\n", __func__);
4063         } else
4064                 nfs_free_seqid(data->arg.lock_seqid);
4065         nfs4_put_lock_state(data->lsp);
4066         put_nfs_open_context(data->ctx);
4067         kfree(data);
4068         dprintk("%s: done!\n", __func__);
4069 }
4070
4071 static const struct rpc_call_ops nfs4_lock_ops = {
4072         .rpc_call_prepare = nfs4_lock_prepare,
4073         .rpc_call_done = nfs4_lock_done,
4074         .rpc_release = nfs4_lock_release,
4075 };
4076
4077 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4078         .rpc_call_prepare = nfs4_recover_lock_prepare,
4079         .rpc_call_done = nfs4_lock_done,
4080         .rpc_release = nfs4_lock_release,
4081 };
4082
4083 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4084 {
4085         struct nfs_client *clp = server->nfs_client;
4086         struct nfs4_state *state = lsp->ls_state;
4087
4088         switch (error) {
4089         case -NFS4ERR_ADMIN_REVOKED:
4090         case -NFS4ERR_BAD_STATEID:
4091         case -NFS4ERR_EXPIRED:
4092                 if (new_lock_owner != 0 ||
4093                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4094                         nfs4_state_mark_reclaim_nograce(clp, state);
4095                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4096                 break;
4097         case -NFS4ERR_STALE_STATEID:
4098                 if (new_lock_owner != 0 ||
4099                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4100                         nfs4_state_mark_reclaim_reboot(clp, state);
4101                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4102         };
4103 }
4104
4105 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4106 {
4107         struct nfs4_lockdata *data;
4108         struct rpc_task *task;
4109         struct rpc_message msg = {
4110                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4111                 .rpc_cred = state->owner->so_cred,
4112         };
4113         struct rpc_task_setup task_setup_data = {
4114                 .rpc_client = NFS_CLIENT(state->inode),
4115                 .rpc_message = &msg,
4116                 .callback_ops = &nfs4_lock_ops,
4117                 .workqueue = nfsiod_workqueue,
4118                 .flags = RPC_TASK_ASYNC,
4119         };
4120         int ret;
4121
4122         dprintk("%s: begin!\n", __func__);
4123         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4124                         fl->fl_u.nfs4_fl.owner,
4125                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4126         if (data == NULL)
4127                 return -ENOMEM;
4128         if (IS_SETLKW(cmd))
4129                 data->arg.block = 1;
4130         if (recovery_type > NFS_LOCK_NEW) {
4131                 if (recovery_type == NFS_LOCK_RECLAIM)
4132                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4133                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4134         }
4135         msg.rpc_argp = &data->arg,
4136         msg.rpc_resp = &data->res,
4137         task_setup_data.callback_data = data;
4138         task = rpc_run_task(&task_setup_data);
4139         if (IS_ERR(task))
4140                 return PTR_ERR(task);
4141         ret = nfs4_wait_for_completion_rpc_task(task);
4142         if (ret == 0) {
4143                 ret = data->rpc_status;
4144                 if (ret)
4145                         nfs4_handle_setlk_error(data->server, data->lsp,
4146                                         data->arg.new_lock_owner, ret);
4147         } else
4148                 data->cancelled = 1;
4149         rpc_put_task(task);
4150         dprintk("%s: done, ret = %d!\n", __func__, ret);
4151         return ret;
4152 }
4153
4154 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4155 {
4156         struct nfs_server *server = NFS_SERVER(state->inode);
4157         struct nfs4_exception exception = { };
4158         int err;
4159
4160         do {
4161                 /* Cache the lock if possible... */
4162                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4163                         return 0;
4164                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4165                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4166                         break;
4167                 nfs4_handle_exception(server, err, &exception);
4168         } while (exception.retry);
4169         return err;
4170 }
4171
4172 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4173 {
4174         struct nfs_server *server = NFS_SERVER(state->inode);
4175         struct nfs4_exception exception = { };
4176         int err;
4177
4178         err = nfs4_set_lock_state(state, request);
4179         if (err != 0)
4180                 return err;
4181         do {
4182                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4183                         return 0;
4184                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4185                 switch (err) {
4186                 default:
4187                         goto out;
4188                 case -NFS4ERR_GRACE:
4189                 case -NFS4ERR_DELAY:
4190                 case -EKEYEXPIRED:
4191                         nfs4_handle_exception(server, err, &exception);
4192                         err = 0;
4193                 }
4194         } while (exception.retry);
4195 out:
4196         return err;
4197 }
4198
4199 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4200 {
4201         struct nfs_inode *nfsi = NFS_I(state->inode);
4202         unsigned char fl_flags = request->fl_flags;
4203         int status = -ENOLCK;
4204
4205         if ((fl_flags & FL_POSIX) &&
4206                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4207                 goto out;
4208         /* Is this a delegated open? */
4209         status = nfs4_set_lock_state(state, request);
4210         if (status != 0)
4211                 goto out;
4212         request->fl_flags |= FL_ACCESS;
4213         status = do_vfs_lock(request->fl_file, request);
4214         if (status < 0)
4215                 goto out;
4216         down_read(&nfsi->rwsem);
4217         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4218                 /* Yes: cache locks! */
4219                 /* ...but avoid races with delegation recall... */
4220                 request->fl_flags = fl_flags & ~FL_SLEEP;
4221                 status = do_vfs_lock(request->fl_file, request);
4222                 goto out_unlock;
4223         }
4224         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4225         if (status != 0)
4226                 goto out_unlock;
4227         /* Note: we always want to sleep here! */
4228         request->fl_flags = fl_flags | FL_SLEEP;
4229         if (do_vfs_lock(request->fl_file, request) < 0)
4230                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4231 out_unlock:
4232         up_read(&nfsi->rwsem);
4233 out:
4234         request->fl_flags = fl_flags;
4235         return status;
4236 }
4237
4238 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4239 {
4240         struct nfs4_exception exception = { };
4241         int err;
4242
4243         do {
4244                 err = _nfs4_proc_setlk(state, cmd, request);
4245                 if (err == -NFS4ERR_DENIED)
4246                         err = -EAGAIN;
4247                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4248                                 err, &exception);
4249         } while (exception.retry);
4250         return err;
4251 }
4252
4253 static int
4254 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4255 {
4256         struct nfs_open_context *ctx;
4257         struct nfs4_state *state;
4258         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4259         int status;
4260
4261         /* verify open state */
4262         ctx = nfs_file_open_context(filp);
4263         state = ctx->state;
4264
4265         if (request->fl_start < 0 || request->fl_end < 0)
4266                 return -EINVAL;
4267
4268         if (IS_GETLK(cmd)) {
4269                 if (state != NULL)
4270                         return nfs4_proc_getlk(state, F_GETLK, request);
4271                 return 0;
4272         }
4273
4274         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4275                 return -EINVAL;
4276
4277         if (request->fl_type == F_UNLCK) {
4278                 if (state != NULL)
4279                         return nfs4_proc_unlck(state, cmd, request);
4280                 return 0;
4281         }
4282
4283         if (state == NULL)
4284                 return -ENOLCK;
4285         do {
4286                 status = nfs4_proc_setlk(state, cmd, request);
4287                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4288                         break;
4289                 timeout = nfs4_set_lock_task_retry(timeout);
4290                 status = -ERESTARTSYS;
4291                 if (signalled())
4292                         break;
4293         } while(status < 0);
4294         return status;
4295 }
4296
4297 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4298 {
4299         struct nfs_server *server = NFS_SERVER(state->inode);
4300         struct nfs4_exception exception = { };
4301         int err;
4302
4303         err = nfs4_set_lock_state(state, fl);
4304         if (err != 0)
4305                 goto out;
4306         do {
4307                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4308                 switch (err) {
4309                         default:
4310                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4311                                                 __func__, err);
4312                         case 0:
4313                         case -ESTALE:
4314                                 goto out;
4315                         case -NFS4ERR_EXPIRED:
4316                         case -NFS4ERR_STALE_CLIENTID:
4317                         case -NFS4ERR_STALE_STATEID:
4318                         case -NFS4ERR_BADSESSION:
4319                         case -NFS4ERR_BADSLOT:
4320                         case -NFS4ERR_BAD_HIGH_SLOT:
4321                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4322                         case -NFS4ERR_DEADSESSION:
4323                                 nfs4_schedule_state_recovery(server->nfs_client);
4324                                 goto out;
4325                         case -ERESTARTSYS:
4326                                 /*
4327                                  * The show must go on: exit, but mark the
4328                                  * stateid as needing recovery.
4329                                  */
4330                         case -NFS4ERR_ADMIN_REVOKED:
4331                         case -NFS4ERR_BAD_STATEID:
4332                         case -NFS4ERR_OPENMODE:
4333                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4334                                 err = 0;
4335                                 goto out;
4336                         case -ENOMEM:
4337                         case -NFS4ERR_DENIED:
4338                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4339                                 err = 0;
4340                                 goto out;
4341                         case -NFS4ERR_DELAY:
4342                         case -EKEYEXPIRED:
4343                                 break;
4344                 }
4345                 err = nfs4_handle_exception(server, err, &exception);
4346         } while (exception.retry);
4347 out:
4348         return err;
4349 }
4350
4351 static void nfs4_release_lockowner_release(void *calldata)
4352 {
4353         kfree(calldata);
4354 }
4355
4356 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4357         .rpc_release = nfs4_release_lockowner_release,
4358 };
4359
4360 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4361 {
4362         struct nfs_server *server = lsp->ls_state->owner->so_server;
4363         struct nfs_release_lockowner_args *args;
4364         struct rpc_message msg = {
4365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4366         };
4367
4368         if (server->nfs_client->cl_mvops->minor_version != 0)
4369                 return;
4370         args = kmalloc(sizeof(*args), GFP_NOFS);
4371         if (!args)
4372                 return;
4373         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4374         args->lock_owner.id = lsp->ls_id.id;
4375         msg.rpc_argp = args;
4376         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4377 }
4378
4379 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4380
4381 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4382                 size_t buflen, int flags)
4383 {
4384         struct inode *inode = dentry->d_inode;
4385
4386         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4387                 return -EOPNOTSUPP;
4388
4389         return nfs4_proc_set_acl(inode, buf, buflen);
4390 }
4391
4392 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4393  * and that's what we'll do for e.g. user attributes that haven't been set.
4394  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4395  * attributes in kernel-managed attribute namespaces. */
4396 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4397                 size_t buflen)
4398 {
4399         struct inode *inode = dentry->d_inode;
4400
4401         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4402                 return -EOPNOTSUPP;
4403
4404         return nfs4_proc_get_acl(inode, buf, buflen);
4405 }
4406
4407 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4408 {
4409         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4410
4411         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4412                 return 0;
4413         if (buf && buflen < len)
4414                 return -ERANGE;
4415         if (buf)
4416                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4417         return len;
4418 }
4419
4420 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4421 {
4422         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4423                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4424                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4425                 return;
4426
4427         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4428                 NFS_ATTR_FATTR_NLINK;
4429         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4430         fattr->nlink = 2;
4431 }
4432
4433 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4434                 struct nfs4_fs_locations *fs_locations, struct page *page)
4435 {
4436         struct nfs_server *server = NFS_SERVER(dir);
4437         u32 bitmask[2] = {
4438                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4439                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4440         };
4441         struct nfs4_fs_locations_arg args = {
4442                 .dir_fh = NFS_FH(dir),
4443                 .name = name,
4444                 .page = page,
4445                 .bitmask = bitmask,
4446         };
4447         struct nfs4_fs_locations_res res = {
4448                 .fs_locations = fs_locations,
4449         };
4450         struct rpc_message msg = {
4451                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4452                 .rpc_argp = &args,
4453                 .rpc_resp = &res,
4454         };
4455         int status;
4456
4457         dprintk("%s: start\n", __func__);
4458         nfs_fattr_init(&fs_locations->fattr);
4459         fs_locations->server = server;
4460         fs_locations->nlocations = 0;
4461         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4462         nfs_fixup_referral_attributes(&fs_locations->fattr);
4463         dprintk("%s: returned status = %d\n", __func__, status);
4464         return status;
4465 }
4466
4467 #ifdef CONFIG_NFS_V4_1
4468 /*
4469  * nfs4_proc_exchange_id()
4470  *
4471  * Since the clientid has expired, all compounds using sessions
4472  * associated with the stale clientid will be returning
4473  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4474  * be in some phase of session reset.
4475  */
4476 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4477 {
4478         nfs4_verifier verifier;
4479         struct nfs41_exchange_id_args args = {
4480                 .client = clp,
4481                 .flags = clp->cl_exchange_flags,
4482         };
4483         struct nfs41_exchange_id_res res = {
4484                 .client = clp,
4485         };
4486         int status;
4487         struct rpc_message msg = {
4488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4489                 .rpc_argp = &args,
4490                 .rpc_resp = &res,
4491                 .rpc_cred = cred,
4492         };
4493         __be32 *p;
4494
4495         dprintk("--> %s\n", __func__);
4496         BUG_ON(clp == NULL);
4497
4498         /* Remove server-only flags */
4499         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4500
4501         p = (u32 *)verifier.data;
4502         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4503         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4504         args.verifier = &verifier;
4505
4506         while (1) {
4507                 args.id_len = scnprintf(args.id, sizeof(args.id),
4508                                         "%s/%s %u",
4509                                         clp->cl_ipaddr,
4510                                         rpc_peeraddr2str(clp->cl_rpcclient,
4511                                                          RPC_DISPLAY_ADDR),
4512                                         clp->cl_id_uniquifier);
4513
4514                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4515
4516                 if (status != -NFS4ERR_CLID_INUSE)
4517                         break;
4518
4519                 if (signalled())
4520                         break;
4521
4522                 if (++clp->cl_id_uniquifier == 0)
4523                         break;
4524         }
4525
4526         dprintk("<-- %s status= %d\n", __func__, status);
4527         return status;
4528 }
4529
4530 struct nfs4_get_lease_time_data {
4531         struct nfs4_get_lease_time_args *args;
4532         struct nfs4_get_lease_time_res *res;
4533         struct nfs_client *clp;
4534 };
4535
4536 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4537                                         void *calldata)
4538 {
4539         int ret;
4540         struct nfs4_get_lease_time_data *data =
4541                         (struct nfs4_get_lease_time_data *)calldata;
4542
4543         dprintk("--> %s\n", __func__);
4544         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4545         /* just setup sequence, do not trigger session recovery
4546            since we're invoked within one */
4547         ret = nfs41_setup_sequence(data->clp->cl_session,
4548                                    &data->args->la_seq_args,
4549                                    &data->res->lr_seq_res, 0, task);
4550
4551         BUG_ON(ret == -EAGAIN);
4552         rpc_call_start(task);
4553         dprintk("<-- %s\n", __func__);
4554 }
4555
4556 /*
4557  * Called from nfs4_state_manager thread for session setup, so don't recover
4558  * from sequence operation or clientid errors.
4559  */
4560 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4561 {
4562         struct nfs4_get_lease_time_data *data =
4563                         (struct nfs4_get_lease_time_data *)calldata;
4564
4565         dprintk("--> %s\n", __func__);
4566         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4567                 return;
4568         switch (task->tk_status) {
4569         case -NFS4ERR_DELAY:
4570         case -NFS4ERR_GRACE:
4571         case -EKEYEXPIRED:
4572                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4573                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4574                 task->tk_status = 0;
4575                 nfs_restart_rpc(task, data->clp);
4576                 return;
4577         }
4578         dprintk("<-- %s\n", __func__);
4579 }
4580
4581 struct rpc_call_ops nfs4_get_lease_time_ops = {
4582         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4583         .rpc_call_done = nfs4_get_lease_time_done,
4584 };
4585
4586 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4587 {
4588         struct rpc_task *task;
4589         struct nfs4_get_lease_time_args args;
4590         struct nfs4_get_lease_time_res res = {
4591                 .lr_fsinfo = fsinfo,
4592         };
4593         struct nfs4_get_lease_time_data data = {
4594                 .args = &args,
4595                 .res = &res,
4596                 .clp = clp,
4597         };
4598         struct rpc_message msg = {
4599                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4600                 .rpc_argp = &args,
4601                 .rpc_resp = &res,
4602         };
4603         struct rpc_task_setup task_setup = {
4604                 .rpc_client = clp->cl_rpcclient,
4605                 .rpc_message = &msg,
4606                 .callback_ops = &nfs4_get_lease_time_ops,
4607                 .callback_data = &data
4608         };
4609         int status;
4610
4611         dprintk("--> %s\n", __func__);
4612         task = rpc_run_task(&task_setup);
4613
4614         if (IS_ERR(task))
4615                 status = PTR_ERR(task);
4616         else {
4617                 status = task->tk_status;
4618                 rpc_put_task(task);
4619         }
4620         dprintk("<-- %s return %d\n", __func__, status);
4621
4622         return status;
4623 }
4624
4625 /*
4626  * Reset a slot table
4627  */
4628 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4629                                  int ivalue)
4630 {
4631         struct nfs4_slot *new = NULL;
4632         int i;
4633         int ret = 0;
4634
4635         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4636                 max_reqs, tbl->max_slots);
4637
4638         /* Does the newly negotiated max_reqs match the existing slot table? */
4639         if (max_reqs != tbl->max_slots) {
4640                 ret = -ENOMEM;
4641                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4642                               GFP_NOFS);
4643                 if (!new)
4644                         goto out;
4645                 ret = 0;
4646                 kfree(tbl->slots);
4647         }
4648         spin_lock(&tbl->slot_tbl_lock);
4649         if (new) {
4650                 tbl->slots = new;
4651                 tbl->max_slots = max_reqs;
4652         }
4653         for (i = 0; i < tbl->max_slots; ++i)
4654                 tbl->slots[i].seq_nr = ivalue;
4655         spin_unlock(&tbl->slot_tbl_lock);
4656         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4657                 tbl, tbl->slots, tbl->max_slots);
4658 out:
4659         dprintk("<-- %s: return %d\n", __func__, ret);
4660         return ret;
4661 }
4662
4663 /*
4664  * Reset the forechannel and backchannel slot tables
4665  */
4666 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4667 {
4668         int status;
4669
4670         status = nfs4_reset_slot_table(&session->fc_slot_table,
4671                         session->fc_attrs.max_reqs, 1);
4672         if (status)
4673                 return status;
4674
4675         status = nfs4_reset_slot_table(&session->bc_slot_table,
4676                         session->bc_attrs.max_reqs, 0);
4677         return status;
4678 }
4679
4680 /* Destroy the slot table */
4681 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4682 {
4683         if (session->fc_slot_table.slots != NULL) {
4684                 kfree(session->fc_slot_table.slots);
4685                 session->fc_slot_table.slots = NULL;
4686         }
4687         if (session->bc_slot_table.slots != NULL) {
4688                 kfree(session->bc_slot_table.slots);
4689                 session->bc_slot_table.slots = NULL;
4690         }
4691         return;
4692 }
4693
4694 /*
4695  * Initialize slot table
4696  */
4697 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4698                 int max_slots, int ivalue)
4699 {
4700         struct nfs4_slot *slot;
4701         int ret = -ENOMEM;
4702
4703         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4704
4705         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4706
4707         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4708         if (!slot)
4709                 goto out;
4710         ret = 0;
4711
4712         spin_lock(&tbl->slot_tbl_lock);
4713         tbl->max_slots = max_slots;
4714         tbl->slots = slot;
4715         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4716         spin_unlock(&tbl->slot_tbl_lock);
4717         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4718                 tbl, tbl->slots, tbl->max_slots);
4719 out:
4720         dprintk("<-- %s: return %d\n", __func__, ret);
4721         return ret;
4722 }
4723
4724 /*
4725  * Initialize the forechannel and backchannel tables
4726  */
4727 static int nfs4_init_slot_tables(struct nfs4_session *session)
4728 {
4729         struct nfs4_slot_table *tbl;
4730         int status = 0;
4731
4732         tbl = &session->fc_slot_table;
4733         if (tbl->slots == NULL) {
4734                 status = nfs4_init_slot_table(tbl,
4735                                 session->fc_attrs.max_reqs, 1);
4736                 if (status)
4737                         return status;
4738         }
4739
4740         tbl = &session->bc_slot_table;
4741         if (tbl->slots == NULL) {
4742                 status = nfs4_init_slot_table(tbl,
4743                                 session->bc_attrs.max_reqs, 0);
4744                 if (status)
4745                         nfs4_destroy_slot_tables(session);
4746         }
4747
4748         return status;
4749 }
4750
4751 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4752 {
4753         struct nfs4_session *session;
4754         struct nfs4_slot_table *tbl;
4755
4756         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4757         if (!session)
4758                 return NULL;
4759
4760         init_completion(&session->complete);
4761
4762         tbl = &session->fc_slot_table;
4763         tbl->highest_used_slotid = -1;
4764         spin_lock_init(&tbl->slot_tbl_lock);
4765         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4766
4767         tbl = &session->bc_slot_table;
4768         tbl->highest_used_slotid = -1;
4769         spin_lock_init(&tbl->slot_tbl_lock);
4770         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4771
4772         session->session_state = 1<<NFS4_SESSION_INITING;
4773
4774         session->clp = clp;
4775         return session;
4776 }
4777
4778 void nfs4_destroy_session(struct nfs4_session *session)
4779 {
4780         nfs4_proc_destroy_session(session);
4781         dprintk("%s Destroy backchannel for xprt %p\n",
4782                 __func__, session->clp->cl_rpcclient->cl_xprt);
4783         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4784                                 NFS41_BC_MIN_CALLBACKS);
4785         nfs4_destroy_slot_tables(session);
4786         kfree(session);
4787 }
4788
4789 /*
4790  * Initialize the values to be used by the client in CREATE_SESSION
4791  * If nfs4_init_session set the fore channel request and response sizes,
4792  * use them.
4793  *
4794  * Set the back channel max_resp_sz_cached to zero to force the client to
4795  * always set csa_cachethis to FALSE because the current implementation
4796  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4797  */
4798 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4799 {
4800         struct nfs4_session *session = args->client->cl_session;
4801         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4802                      mxresp_sz = session->fc_attrs.max_resp_sz;
4803
4804         if (mxrqst_sz == 0)
4805                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4806         if (mxresp_sz == 0)
4807                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4808         /* Fore channel attributes */
4809         args->fc_attrs.headerpadsz = 0;
4810         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4811         args->fc_attrs.max_resp_sz = mxresp_sz;
4812         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4813         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4814
4815         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4816                 "max_ops=%u max_reqs=%u\n",
4817                 __func__,
4818                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4819                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4820
4821         /* Back channel attributes */
4822         args->bc_attrs.headerpadsz = 0;
4823         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4824         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4825         args->bc_attrs.max_resp_sz_cached = 0;
4826         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4827         args->bc_attrs.max_reqs = 1;
4828
4829         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4830                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4831                 __func__,
4832                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4833                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4834                 args->bc_attrs.max_reqs);
4835 }
4836
4837 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4838 {
4839         if (rcvd <= sent)
4840                 return 0;
4841         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4842                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4843         return -EINVAL;
4844 }
4845
4846 #define _verify_fore_channel_attr(_name_) \
4847         _verify_channel_attr("fore", #_name_, \
4848                              args->fc_attrs._name_, \
4849                              session->fc_attrs._name_)
4850
4851 #define _verify_back_channel_attr(_name_) \
4852         _verify_channel_attr("back", #_name_, \
4853                              args->bc_attrs._name_, \
4854                              session->bc_attrs._name_)
4855
4856 /*
4857  * The server is not allowed to increase the fore channel header pad size,
4858  * maximum response size, or maximum number of operations.
4859  *
4860  * The back channel attributes are only negotiatied down: We send what the
4861  * (back channel) server insists upon.
4862  */
4863 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4864                                      struct nfs4_session *session)
4865 {
4866         int ret = 0;
4867
4868         ret |= _verify_fore_channel_attr(headerpadsz);
4869         ret |= _verify_fore_channel_attr(max_resp_sz);
4870         ret |= _verify_fore_channel_attr(max_ops);
4871
4872         ret |= _verify_back_channel_attr(headerpadsz);
4873         ret |= _verify_back_channel_attr(max_rqst_sz);
4874         ret |= _verify_back_channel_attr(max_resp_sz);
4875         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4876         ret |= _verify_back_channel_attr(max_ops);
4877         ret |= _verify_back_channel_attr(max_reqs);
4878
4879         return ret;
4880 }
4881
4882 static int _nfs4_proc_create_session(struct nfs_client *clp)
4883 {
4884         struct nfs4_session *session = clp->cl_session;
4885         struct nfs41_create_session_args args = {
4886                 .client = clp,
4887                 .cb_program = NFS4_CALLBACK,
4888         };
4889         struct nfs41_create_session_res res = {
4890                 .client = clp,
4891         };
4892         struct rpc_message msg = {
4893                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4894                 .rpc_argp = &args,
4895                 .rpc_resp = &res,
4896         };
4897         int status;
4898
4899         nfs4_init_channel_attrs(&args);
4900         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4901
4902         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4903
4904         if (!status)
4905                 /* Verify the session's negotiated channel_attrs values */
4906                 status = nfs4_verify_channel_attrs(&args, session);
4907         if (!status) {
4908                 /* Increment the clientid slot sequence id */
4909                 clp->cl_seqid++;
4910         }
4911
4912         return status;
4913 }
4914
4915 /*
4916  * Issues a CREATE_SESSION operation to the server.
4917  * It is the responsibility of the caller to verify the session is
4918  * expired before calling this routine.
4919  */
4920 int nfs4_proc_create_session(struct nfs_client *clp)
4921 {
4922         int status;
4923         unsigned *ptr;
4924         struct nfs4_session *session = clp->cl_session;
4925
4926         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4927
4928         status = _nfs4_proc_create_session(clp);
4929         if (status)
4930                 goto out;
4931
4932         /* Init and reset the fore channel */
4933         status = nfs4_init_slot_tables(session);
4934         dprintk("slot table initialization returned %d\n", status);
4935         if (status)
4936                 goto out;
4937         status = nfs4_reset_slot_tables(session);
4938         dprintk("slot table reset returned %d\n", status);
4939         if (status)
4940                 goto out;
4941
4942         ptr = (unsigned *)&session->sess_id.data[0];
4943         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4944                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4945 out:
4946         dprintk("<-- %s\n", __func__);
4947         return status;
4948 }
4949
4950 /*
4951  * Issue the over-the-wire RPC DESTROY_SESSION.
4952  * The caller must serialize access to this routine.
4953  */
4954 int nfs4_proc_destroy_session(struct nfs4_session *session)
4955 {
4956         int status = 0;
4957         struct rpc_message msg;
4958
4959         dprintk("--> nfs4_proc_destroy_session\n");
4960
4961         /* session is still being setup */
4962         if (session->clp->cl_cons_state != NFS_CS_READY)
4963                 return status;
4964
4965         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4966         msg.rpc_argp = session;
4967         msg.rpc_resp = NULL;
4968         msg.rpc_cred = NULL;
4969         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4970
4971         if (status)
4972                 printk(KERN_WARNING
4973                         "Got error %d from the server on DESTROY_SESSION. "
4974                         "Session has been destroyed regardless...\n", status);
4975
4976         dprintk("<-- nfs4_proc_destroy_session\n");
4977         return status;
4978 }
4979
4980 int nfs4_init_session(struct nfs_server *server)
4981 {
4982         struct nfs_client *clp = server->nfs_client;
4983         struct nfs4_session *session;
4984         unsigned int rsize, wsize;
4985         int ret;
4986
4987         if (!nfs4_has_session(clp))
4988                 return 0;
4989
4990         session = clp->cl_session;
4991         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
4992                 return 0;
4993
4994         rsize = server->rsize;
4995         if (rsize == 0)
4996                 rsize = NFS_MAX_FILE_IO_SIZE;
4997         wsize = server->wsize;
4998         if (wsize == 0)
4999                 wsize = NFS_MAX_FILE_IO_SIZE;
5000
5001         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5002         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5003
5004         ret = nfs4_recover_expired_lease(server);
5005         if (!ret)
5006                 ret = nfs4_check_client_ready(clp);
5007         return ret;
5008 }
5009
5010 /*
5011  * Renew the cl_session lease.
5012  */
5013 struct nfs4_sequence_data {
5014         struct nfs_client *clp;
5015         struct nfs4_sequence_args args;
5016         struct nfs4_sequence_res res;
5017 };
5018
5019 static void nfs41_sequence_release(void *data)
5020 {
5021         struct nfs4_sequence_data *calldata = data;
5022         struct nfs_client *clp = calldata->clp;
5023
5024         if (atomic_read(&clp->cl_count) > 1)
5025                 nfs4_schedule_state_renewal(clp);
5026         nfs_put_client(clp);
5027         kfree(calldata);
5028 }
5029
5030 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5031 {
5032         switch(task->tk_status) {
5033         case -NFS4ERR_DELAY:
5034         case -EKEYEXPIRED:
5035                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5036                 return -EAGAIN;
5037         default:
5038                 nfs4_schedule_state_recovery(clp);
5039         }
5040         return 0;
5041 }
5042
5043 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5044 {
5045         struct nfs4_sequence_data *calldata = data;
5046         struct nfs_client *clp = calldata->clp;
5047
5048         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5049                 return;
5050
5051         if (task->tk_status < 0) {
5052                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5053                 if (atomic_read(&clp->cl_count) == 1)
5054                         goto out;
5055
5056                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5057                         rpc_restart_call_prepare(task);
5058                         return;
5059                 }
5060         }
5061         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5062 out:
5063         dprintk("<-- %s\n", __func__);
5064 }
5065
5066 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5067 {
5068         struct nfs4_sequence_data *calldata = data;
5069         struct nfs_client *clp = calldata->clp;
5070         struct nfs4_sequence_args *args;
5071         struct nfs4_sequence_res *res;
5072
5073         args = task->tk_msg.rpc_argp;
5074         res = task->tk_msg.rpc_resp;
5075
5076         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5077                 return;
5078         rpc_call_start(task);
5079 }
5080
5081 static const struct rpc_call_ops nfs41_sequence_ops = {
5082         .rpc_call_done = nfs41_sequence_call_done,
5083         .rpc_call_prepare = nfs41_sequence_prepare,
5084         .rpc_release = nfs41_sequence_release,
5085 };
5086
5087 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5088 {
5089         struct nfs4_sequence_data *calldata;
5090         struct rpc_message msg = {
5091                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5092                 .rpc_cred = cred,
5093         };
5094         struct rpc_task_setup task_setup_data = {
5095                 .rpc_client = clp->cl_rpcclient,
5096                 .rpc_message = &msg,
5097                 .callback_ops = &nfs41_sequence_ops,
5098                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5099         };
5100
5101         if (!atomic_inc_not_zero(&clp->cl_count))
5102                 return ERR_PTR(-EIO);
5103         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5104         if (calldata == NULL) {
5105                 nfs_put_client(clp);
5106                 return ERR_PTR(-ENOMEM);
5107         }
5108         msg.rpc_argp = &calldata->args;
5109         msg.rpc_resp = &calldata->res;
5110         calldata->clp = clp;
5111         task_setup_data.callback_data = calldata;
5112
5113         return rpc_run_task(&task_setup_data);
5114 }
5115
5116 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5117 {
5118         struct rpc_task *task;
5119         int ret = 0;
5120
5121         task = _nfs41_proc_sequence(clp, cred);
5122         if (IS_ERR(task))
5123                 ret = PTR_ERR(task);
5124         else
5125                 rpc_put_task(task);
5126         dprintk("<-- %s status=%d\n", __func__, ret);
5127         return ret;
5128 }
5129
5130 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5131 {
5132         struct rpc_task *task;
5133         int ret;
5134
5135         task = _nfs41_proc_sequence(clp, cred);
5136         if (IS_ERR(task)) {
5137                 ret = PTR_ERR(task);
5138                 goto out;
5139         }
5140         ret = rpc_wait_for_completion_task(task);
5141         if (!ret)
5142                 ret = task->tk_status;
5143         rpc_put_task(task);
5144 out:
5145         dprintk("<-- %s status=%d\n", __func__, ret);
5146         return ret;
5147 }
5148
5149 struct nfs4_reclaim_complete_data {
5150         struct nfs_client *clp;
5151         struct nfs41_reclaim_complete_args arg;
5152         struct nfs41_reclaim_complete_res res;
5153 };
5154
5155 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5156 {
5157         struct nfs4_reclaim_complete_data *calldata = data;
5158
5159         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5160         if (nfs41_setup_sequence(calldata->clp->cl_session,
5161                                 &calldata->arg.seq_args,
5162                                 &calldata->res.seq_res, 0, task))
5163                 return;
5164
5165         rpc_call_start(task);
5166 }
5167
5168 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5169 {
5170         switch(task->tk_status) {
5171         case 0:
5172         case -NFS4ERR_COMPLETE_ALREADY:
5173         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5174                 break;
5175         case -NFS4ERR_DELAY:
5176         case -EKEYEXPIRED:
5177                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5178                 return -EAGAIN;
5179         default:
5180                 nfs4_schedule_state_recovery(clp);
5181         }
5182         return 0;
5183 }
5184
5185 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5186 {
5187         struct nfs4_reclaim_complete_data *calldata = data;
5188         struct nfs_client *clp = calldata->clp;
5189         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5190
5191         dprintk("--> %s\n", __func__);
5192         if (!nfs41_sequence_done(task, res))
5193                 return;
5194
5195         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5196                 rpc_restart_call_prepare(task);
5197                 return;
5198         }
5199         dprintk("<-- %s\n", __func__);
5200 }
5201
5202 static void nfs4_free_reclaim_complete_data(void *data)
5203 {
5204         struct nfs4_reclaim_complete_data *calldata = data;
5205
5206         kfree(calldata);
5207 }
5208
5209 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5210         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5211         .rpc_call_done = nfs4_reclaim_complete_done,
5212         .rpc_release = nfs4_free_reclaim_complete_data,
5213 };
5214
5215 /*
5216  * Issue a global reclaim complete.
5217  */
5218 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5219 {
5220         struct nfs4_reclaim_complete_data *calldata;
5221         struct rpc_task *task;
5222         struct rpc_message msg = {
5223                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5224         };
5225         struct rpc_task_setup task_setup_data = {
5226                 .rpc_client = clp->cl_rpcclient,
5227                 .rpc_message = &msg,
5228                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5229                 .flags = RPC_TASK_ASYNC,
5230         };
5231         int status = -ENOMEM;
5232
5233         dprintk("--> %s\n", __func__);
5234         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5235         if (calldata == NULL)
5236                 goto out;
5237         calldata->clp = clp;
5238         calldata->arg.one_fs = 0;
5239
5240         msg.rpc_argp = &calldata->arg;
5241         msg.rpc_resp = &calldata->res;
5242         task_setup_data.callback_data = calldata;
5243         task = rpc_run_task(&task_setup_data);
5244         if (IS_ERR(task)) {
5245                 status = PTR_ERR(task);
5246                 goto out;
5247         }
5248         rpc_put_task(task);
5249         return 0;
5250 out:
5251         dprintk("<-- %s status=%d\n", __func__, status);
5252         return status;
5253 }
5254 #endif /* CONFIG_NFS_V4_1 */
5255
5256 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5257         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5258         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5259         .recover_open   = nfs4_open_reclaim,
5260         .recover_lock   = nfs4_lock_reclaim,
5261         .establish_clid = nfs4_init_clientid,
5262         .get_clid_cred  = nfs4_get_setclientid_cred,
5263 };
5264
5265 #if defined(CONFIG_NFS_V4_1)
5266 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5267         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5268         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5269         .recover_open   = nfs4_open_reclaim,
5270         .recover_lock   = nfs4_lock_reclaim,
5271         .establish_clid = nfs41_init_clientid,
5272         .get_clid_cred  = nfs4_get_exchange_id_cred,
5273         .reclaim_complete = nfs41_proc_reclaim_complete,
5274 };
5275 #endif /* CONFIG_NFS_V4_1 */
5276
5277 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5278         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5279         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5280         .recover_open   = nfs4_open_expired,
5281         .recover_lock   = nfs4_lock_expired,
5282         .establish_clid = nfs4_init_clientid,
5283         .get_clid_cred  = nfs4_get_setclientid_cred,
5284 };
5285
5286 #if defined(CONFIG_NFS_V4_1)
5287 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5288         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5289         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5290         .recover_open   = nfs4_open_expired,
5291         .recover_lock   = nfs4_lock_expired,
5292         .establish_clid = nfs41_init_clientid,
5293         .get_clid_cred  = nfs4_get_exchange_id_cred,
5294 };
5295 #endif /* CONFIG_NFS_V4_1 */
5296
5297 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5298         .sched_state_renewal = nfs4_proc_async_renew,
5299         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5300         .renew_lease = nfs4_proc_renew,
5301 };
5302
5303 #if defined(CONFIG_NFS_V4_1)
5304 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5305         .sched_state_renewal = nfs41_proc_async_sequence,
5306         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5307         .renew_lease = nfs4_proc_sequence,
5308 };
5309 #endif
5310
5311 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5312         .minor_version = 0,
5313         .call_sync = _nfs4_call_sync,
5314         .validate_stateid = nfs4_validate_delegation_stateid,
5315         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5316         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5317         .state_renewal_ops = &nfs40_state_renewal_ops,
5318 };
5319
5320 #if defined(CONFIG_NFS_V4_1)
5321 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5322         .minor_version = 1,
5323         .call_sync = _nfs4_call_sync_session,
5324         .validate_stateid = nfs41_validate_delegation_stateid,
5325         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5326         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5327         .state_renewal_ops = &nfs41_state_renewal_ops,
5328 };
5329 #endif
5330
5331 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5332         [0] = &nfs_v4_0_minor_ops,
5333 #if defined(CONFIG_NFS_V4_1)
5334         [1] = &nfs_v4_1_minor_ops,
5335 #endif
5336 };
5337
5338 static const struct inode_operations nfs4_file_inode_operations = {
5339         .permission     = nfs_permission,
5340         .getattr        = nfs_getattr,
5341         .setattr        = nfs_setattr,
5342         .getxattr       = nfs4_getxattr,
5343         .setxattr       = nfs4_setxattr,
5344         .listxattr      = nfs4_listxattr,
5345 };
5346
5347 const struct nfs_rpc_ops nfs_v4_clientops = {
5348         .version        = 4,                    /* protocol version */
5349         .dentry_ops     = &nfs4_dentry_operations,
5350         .dir_inode_ops  = &nfs4_dir_inode_operations,
5351         .file_inode_ops = &nfs4_file_inode_operations,
5352         .getroot        = nfs4_proc_get_root,
5353         .getattr        = nfs4_proc_getattr,
5354         .setattr        = nfs4_proc_setattr,
5355         .lookupfh       = nfs4_proc_lookupfh,
5356         .lookup         = nfs4_proc_lookup,
5357         .access         = nfs4_proc_access,
5358         .readlink       = nfs4_proc_readlink,
5359         .create         = nfs4_proc_create,
5360         .remove         = nfs4_proc_remove,
5361         .unlink_setup   = nfs4_proc_unlink_setup,
5362         .unlink_done    = nfs4_proc_unlink_done,
5363         .rename         = nfs4_proc_rename,
5364         .rename_setup   = nfs4_proc_rename_setup,
5365         .rename_done    = nfs4_proc_rename_done,
5366         .link           = nfs4_proc_link,
5367         .symlink        = nfs4_proc_symlink,
5368         .mkdir          = nfs4_proc_mkdir,
5369         .rmdir          = nfs4_proc_remove,
5370         .readdir        = nfs4_proc_readdir,
5371         .mknod          = nfs4_proc_mknod,
5372         .statfs         = nfs4_proc_statfs,
5373         .fsinfo         = nfs4_proc_fsinfo,
5374         .pathconf       = nfs4_proc_pathconf,
5375         .set_capabilities = nfs4_server_capabilities,
5376         .decode_dirent  = nfs4_decode_dirent,
5377         .read_setup     = nfs4_proc_read_setup,
5378         .read_done      = nfs4_read_done,
5379         .write_setup    = nfs4_proc_write_setup,
5380         .write_done     = nfs4_write_done,
5381         .commit_setup   = nfs4_proc_commit_setup,
5382         .commit_done    = nfs4_commit_done,
5383         .lock           = nfs4_proc_lock,
5384         .clear_acl_cache = nfs4_zap_acl_attr,
5385         .close_context  = nfs4_close_context,
5386         .open_context   = nfs4_atomic_open,
5387 };
5388
5389 /*
5390  * Local variables:
5391  *  c-basic-offset: 8
5392  * End:
5393  */