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/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83
  84 /* Prevent leaks of NFSv4 errors into userland */
  85 static int nfs4_map_errors(int err)
  86 {
  87         if (err >= -1000)
  88                 return err;
  89         switch (err) {
  90         case -NFS4ERR_RESOURCE:
  91                 return -EREMOTEIO;
  92         case -NFS4ERR_WRONGSEC:
  93                 return -EPERM;
  94         case -NFS4ERR_BADOWNER:
  95         case -NFS4ERR_BADNAME:
  96                 return -EINVAL;
  97         default:
  98                 dprintk("%s could not handle NFSv4 error %d\n",
  99                                 __func__, -err);
 100                 break;
 101         }
 102         return -EIO;
 103 }
 104
 105 /*
 106  * This is our standard bitmap for GETATTR requests.
 107  */
 108 const u32 nfs4_fattr_bitmap[2] = {
 109         FATTR4_WORD0_TYPE
 110         | FATTR4_WORD0_CHANGE
 111         | FATTR4_WORD0_SIZE
 112         | FATTR4_WORD0_FSID
 113         | FATTR4_WORD0_FILEID,
 114         FATTR4_WORD1_MODE
 115         | FATTR4_WORD1_NUMLINKS
 116         | FATTR4_WORD1_OWNER
 117         | FATTR4_WORD1_OWNER_GROUP
 118         | FATTR4_WORD1_RAWDEV
 119         | FATTR4_WORD1_SPACE_USED
 120         | FATTR4_WORD1_TIME_ACCESS
 121         | FATTR4_WORD1_TIME_METADATA
 122         | FATTR4_WORD1_TIME_MODIFY
 123 };
 124
 125 const u32 nfs4_statfs_bitmap[2] = {
 126         FATTR4_WORD0_FILES_AVAIL
 127         | FATTR4_WORD0_FILES_FREE
 128         | FATTR4_WORD0_FILES_TOTAL,
 129         FATTR4_WORD1_SPACE_AVAIL
 130         | FATTR4_WORD1_SPACE_FREE
 131         | FATTR4_WORD1_SPACE_TOTAL
 132 };
 133
 134 const u32 nfs4_pathconf_bitmap[2] = {
 135         FATTR4_WORD0_MAXLINK
 136         | FATTR4_WORD0_MAXNAME,
 137         0
 138 };
 139
 140 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 141                         | FATTR4_WORD0_MAXREAD
 142                         | FATTR4_WORD0_MAXWRITE
 143                         | FATTR4_WORD0_LEASE_TIME,
 144                         FATTR4_WORD1_TIME_DELTA
 145                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 146 };
 147
 148 const u32 nfs4_fs_locations_bitmap[2] = {
 149         FATTR4_WORD0_TYPE
 150         | FATTR4_WORD0_CHANGE
 151         | FATTR4_WORD0_SIZE
 152         | FATTR4_WORD0_FSID
 153         | FATTR4_WORD0_FILEID
 154         | FATTR4_WORD0_FS_LOCATIONS,
 155         FATTR4_WORD1_MODE
 156         | FATTR4_WORD1_NUMLINKS
 157         | FATTR4_WORD1_OWNER
 158         | FATTR4_WORD1_OWNER_GROUP
 159         | FATTR4_WORD1_RAWDEV
 160         | FATTR4_WORD1_SPACE_USED
 161         | FATTR4_WORD1_TIME_ACCESS
 162         | FATTR4_WORD1_TIME_METADATA
 163         | FATTR4_WORD1_TIME_MODIFY
 164         | FATTR4_WORD1_MOUNTED_ON_FILEID
 165 };
 166
 167 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 168                 struct nfs4_readdir_arg *readdir)
 169 {
 170         __be32 *start, *p;
 171
 172         BUG_ON(readdir->count < 80);
 173         if (cookie > 2) {
 174                 readdir->cookie = cookie;
 175                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 176                 return;
 177         }
 178
 179         readdir->cookie = 0;
 180         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 181         if (cookie == 2)
 182                 return;
 183
 184         /*
 185          * NFSv4 servers do not return entries for '.' and '..'
 186          * Therefore, we fake these entries here.  We let '.'
 187          * have cookie 0 and '..' have cookie 1.  Note that
 188          * when talking to the server, we always send cookie 0
 189          * instead of 1 or 2.
 190          */
 191         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 192
 193         if (cookie == 0) {
 194                 *p++ = xdr_one;                                  /* next */
 195                 *p++ = xdr_zero;                   /* cookie, first word */
 196                 *p++ = xdr_one;                   /* cookie, second word */
 197                 *p++ = xdr_one;                             /* entry len */
 198                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 199                 p++;
 200                 *p++ = xdr_one;                         /* bitmap length */
 201                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 202                 *p++ = htonl(8);              /* attribute buffer length */
 203                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 204         }
 205
 206         *p++ = xdr_one;                                  /* next */
 207         *p++ = xdr_zero;                   /* cookie, first word */
 208         *p++ = xdr_two;                   /* cookie, second word */
 209         *p++ = xdr_two;                             /* entry len */
 210         memcpy(p, "..\0\0", 4);                         /* entry */
 211         p++;
 212         *p++ = xdr_one;                         /* bitmap length */
 213         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 214         *p++ = htonl(8);              /* attribute buffer length */
 215         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 216
 217         readdir->pgbase = (char *)p - (char *)start;
 218         readdir->count -= readdir->pgbase;
 219         kunmap_atomic(start, KM_USER0);
 220 }
 221
 222 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 223 {
 224         int res;
 225
 226         might_sleep();
 227
 228         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 229                         nfs_wait_bit_killable, TASK_KILLABLE);
 230         return res;
 231 }
 232
 233 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 234 {
 235         int res = 0;
 236
 237         might_sleep();
 238
 239         if (*timeout <= 0)
 240                 *timeout = NFS4_POLL_RETRY_MIN;
 241         if (*timeout > NFS4_POLL_RETRY_MAX)
 242                 *timeout = NFS4_POLL_RETRY_MAX;
 243         schedule_timeout_killable(*timeout);
 244         if (fatal_signal_pending(current))
 245                 res = -ERESTARTSYS;
 246         *timeout <<= 1;
 247         return res;
 248 }
 249
 250 /* This is the error handling routine for processes that are allowed
 251  * to sleep.
 252  */
 253 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 254 {
 255         struct nfs_client *clp = server->nfs_client;
 256         struct nfs4_state *state = exception->state;
 257         int ret = errorcode;
 258
 259         exception->retry = 0;
 260         switch(errorcode) {
 261                 case 0:
 262                         return 0;
 263                 case -NFS4ERR_ADMIN_REVOKED:
 264                 case -NFS4ERR_BAD_STATEID:
 265                 case -NFS4ERR_OPENMODE:
 266                         if (state == NULL)
 267                                 break;
 268                         nfs4_schedule_stateid_recovery(server, state);
 269                         goto wait_on_recovery;
 270                 case -NFS4ERR_STALE_STATEID:
 271                 case -NFS4ERR_STALE_CLIENTID:
 272                 case -NFS4ERR_EXPIRED:
 273                         nfs4_schedule_lease_recovery(clp);
 274                         goto wait_on_recovery;
 275 #if defined(CONFIG_NFS_V4_1)
 276                 case -NFS4ERR_BADSESSION:
 277                 case -NFS4ERR_BADSLOT:
 278                 case -NFS4ERR_BAD_HIGH_SLOT:
 279                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 280                 case -NFS4ERR_DEADSESSION:
 281                 case -NFS4ERR_SEQ_FALSE_RETRY:
 282                 case -NFS4ERR_SEQ_MISORDERED:
 283                         dprintk("%s ERROR: %d Reset session\n", __func__,
 284                                 errorcode);
 285                         nfs4_schedule_session_recovery(clp->cl_session);
 286                         exception->retry = 1;
 287                         break;
 288 #endif /* defined(CONFIG_NFS_V4_1) */
 289                 case -NFS4ERR_FILE_OPEN:
 290                         if (exception->timeout > HZ) {
 291                                 /* We have retried a decent amount, time to
 292                                  * fail
 293                                  */
 294                                 ret = -EBUSY;
 295                                 break;
 296                         }
 297                 case -NFS4ERR_GRACE:
 298                 case -NFS4ERR_DELAY:
 299                 case -EKEYEXPIRED:
 300                         ret = nfs4_delay(server->client, &exception->timeout);
 301                         if (ret != 0)
 302                                 break;
 303                 case -NFS4ERR_RETRY_UNCACHED_REP:
 304                 case -NFS4ERR_OLD_STATEID:
 305                         exception->retry = 1;
 306                         break;
 307                 case -NFS4ERR_BADOWNER:
 308                         /* The following works around a Linux server bug! */
 309                 case -NFS4ERR_BADNAME:
 310                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 311                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 312                                 exception->retry = 1;
 313                                 printk(KERN_WARNING "NFS: v4 server %s "
 314                                                 "does not accept raw "
 315                                                 "uid/gids. "
 316                                                 "Reenabling the idmapper.\n",
 317                                                 server->nfs_client->cl_hostname);
 318                         }
 319         }
 320         /* We failed to handle the error */
 321         return nfs4_map_errors(ret);
 322 wait_on_recovery:
 323         ret = nfs4_wait_clnt_recover(clp);
 324         if (ret == 0)
 325                 exception->retry = 1;
 326         return ret;
 327 }
 328
 329
 330 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 331 {
 332         spin_lock(&clp->cl_lock);
 333         if (time_before(clp->cl_last_renewal,timestamp))
 334                 clp->cl_last_renewal = timestamp;
 335         spin_unlock(&clp->cl_lock);
 336 }
 337
 338 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 339 {
 340         do_renew_lease(server->nfs_client, timestamp);
 341 }
 342
 343 #if defined(CONFIG_NFS_V4_1)
 344
 345 /*
 346  * nfs4_free_slot - free a slot and efficiently update slot table.
 347  *
 348  * freeing a slot is trivially done by clearing its respective bit
 349  * in the bitmap.
 350  * If the freed slotid equals highest_used_slotid we want to update it
 351  * so that the server would be able to size down the slot table if needed,
 352  * otherwise we know that the highest_used_slotid is still in use.
 353  * When updating highest_used_slotid there may be "holes" in the bitmap
 354  * so we need to scan down from highest_used_slotid to 0 looking for the now
 355  * highest slotid in use.
 356  * If none found, highest_used_slotid is set to -1.
 357  *
 358  * Must be called while holding tbl->slot_tbl_lock
 359  */
 360 static void
 361 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 362 {
 363         int free_slotid = free_slot - tbl->slots;
 364         int slotid = free_slotid;
 365
 366         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 367         /* clear used bit in bitmap */
 368         __clear_bit(slotid, tbl->used_slots);
 369
 370         /* update highest_used_slotid when it is freed */
 371         if (slotid == tbl->highest_used_slotid) {
 372                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 373                 if (slotid < tbl->max_slots)
 374                         tbl->highest_used_slotid = slotid;
 375                 else
 376                         tbl->highest_used_slotid = -1;
 377         }
 378         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 379                 free_slotid, tbl->highest_used_slotid);
 380 }
 381
 382 /*
 383  * Signal state manager thread if session fore channel is drained
 384  */
 385 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 386 {
 387         struct rpc_task *task;
 388
 389         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 390                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 391                 if (task)
 392                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 393                 return;
 394         }
 395
 396         if (ses->fc_slot_table.highest_used_slotid != -1)
 397                 return;
 398
 399         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 400         complete(&ses->fc_slot_table.complete);
 401 }
 402
 403 /*
 404  * Signal state manager thread if session back channel is drained
 405  */
 406 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 407 {
 408         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 409             ses->bc_slot_table.highest_used_slotid != -1)
 410                 return;
 411         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 412         complete(&ses->bc_slot_table.complete);
 413 }
 414
 415 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 416 {
 417         struct nfs4_slot_table *tbl;
 418
 419         tbl = &res->sr_session->fc_slot_table;
 420         if (!res->sr_slot) {
 421                 /* just wake up the next guy waiting since
 422                  * we may have not consumed a slot after all */
 423                 dprintk("%s: No slot\n", __func__);
 424                 return;
 425         }
 426
 427         spin_lock(&tbl->slot_tbl_lock);
 428         nfs4_free_slot(tbl, res->sr_slot);
 429         nfs4_check_drain_fc_complete(res->sr_session);
 430         spin_unlock(&tbl->slot_tbl_lock);
 431         res->sr_slot = NULL;
 432 }
 433
 434 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 435 {
 436         unsigned long timestamp;
 437         struct nfs_client *clp;
 438
 439         /*
 440          * sr_status remains 1 if an RPC level error occurred. The server
 441          * may or may not have processed the sequence operation..
 442          * Proceed as if the server received and processed the sequence
 443          * operation.
 444          */
 445         if (res->sr_status == 1)
 446                 res->sr_status = NFS_OK;
 447
 448         /* don't increment the sequence number if the task wasn't sent */
 449         if (!RPC_WAS_SENT(task))
 450                 goto out;
 451
 452         /* Check the SEQUENCE operation status */
 453         switch (res->sr_status) {
 454         case 0:
 455                 /* Update the slot's sequence and clientid lease timer */
 456                 ++res->sr_slot->seq_nr;
 457                 timestamp = res->sr_renewal_time;
 458                 clp = res->sr_session->clp;
 459                 do_renew_lease(clp, timestamp);
 460                 /* Check sequence flags */
 461                 if (res->sr_status_flags != 0)
 462                         nfs4_schedule_lease_recovery(clp);
 463                 break;
 464         case -NFS4ERR_DELAY:
 465                 /* The server detected a resend of the RPC call and
 466                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 467                  * of RFC5661.
 468                  */
 469                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 470                         __func__,
 471                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 472                         res->sr_slot->seq_nr);
 473                 goto out_retry;
 474         default:
 475                 /* Just update the slot sequence no. */
 476                 ++res->sr_slot->seq_nr;
 477         }
 478 out:
 479         /* The session may be reset by one of the error handlers. */
 480         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 481         nfs41_sequence_free_slot(res);
 482         return 1;
 483 out_retry:
 484         if (!rpc_restart_call(task))
 485                 goto out;
 486         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 487         return 0;
 488 }
 489
 490 static int nfs4_sequence_done(struct rpc_task *task,
 491                                struct nfs4_sequence_res *res)
 492 {
 493         if (res->sr_session == NULL)
 494                 return 1;
 495         return nfs41_sequence_done(task, res);
 496 }
 497
 498 /*
 499  * nfs4_find_slot - efficiently look for a free slot
 500  *
 501  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 502  * If found, we mark the slot as used, update the highest_used_slotid,
 503  * and respectively set up the sequence operation args.
 504  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 505  *
 506  * Note: must be called with under the slot_tbl_lock.
 507  */
 508 static u8
 509 nfs4_find_slot(struct nfs4_slot_table *tbl)
 510 {
 511         int slotid;
 512         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 513         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 514
 515         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 516                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 517                 tbl->max_slots);
 518         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 519         if (slotid >= tbl->max_slots)
 520                 goto out;
 521         __set_bit(slotid, tbl->used_slots);
 522         if (slotid > tbl->highest_used_slotid)
 523                 tbl->highest_used_slotid = slotid;
 524         ret_id = slotid;
 525 out:
 526         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 527                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 528         return ret_id;
 529 }
 530
 531 int nfs41_setup_sequence(struct nfs4_session *session,
 532                                 struct nfs4_sequence_args *args,
 533                                 struct nfs4_sequence_res *res,
 534                                 int cache_reply,
 535                                 struct rpc_task *task)
 536 {
 537         struct nfs4_slot *slot;
 538         struct nfs4_slot_table *tbl;
 539         u8 slotid;
 540
 541         dprintk("--> %s\n", __func__);
 542         /* slot already allocated? */
 543         if (res->sr_slot != NULL)
 544                 return 0;
 545
 546         tbl = &session->fc_slot_table;
 547
 548         spin_lock(&tbl->slot_tbl_lock);
 549         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 550             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 551                 /*
 552                  * The state manager will wait until the slot table is empty.
 553                  * Schedule the reset thread
 554                  */
 555                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 556                 spin_unlock(&tbl->slot_tbl_lock);
 557                 dprintk("%s Schedule Session Reset\n", __func__);
 558                 return -EAGAIN;
 559         }
 560
 561         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 562             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 563                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 564                 spin_unlock(&tbl->slot_tbl_lock);
 565                 dprintk("%s enforce FIFO order\n", __func__);
 566                 return -EAGAIN;
 567         }
 568
 569         slotid = nfs4_find_slot(tbl);
 570         if (slotid == NFS4_MAX_SLOT_TABLE) {
 571                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 572                 spin_unlock(&tbl->slot_tbl_lock);
 573                 dprintk("<-- %s: no free slots\n", __func__);
 574                 return -EAGAIN;
 575         }
 576         spin_unlock(&tbl->slot_tbl_lock);
 577
 578         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 579         slot = tbl->slots + slotid;
 580         args->sa_session = session;
 581         args->sa_slotid = slotid;
 582         args->sa_cache_this = cache_reply;
 583
 584         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 585
 586         res->sr_session = session;
 587         res->sr_slot = slot;
 588         res->sr_renewal_time = jiffies;
 589         res->sr_status_flags = 0;
 590         /*
 591          * sr_status is only set in decode_sequence, and so will remain
 592          * set to 1 if an rpc level failure occurs.
 593          */
 594         res->sr_status = 1;
 595         return 0;
 596 }
 597 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 598
 599 int nfs4_setup_sequence(const struct nfs_server *server,
 600                         struct nfs4_sequence_args *args,
 601                         struct nfs4_sequence_res *res,
 602                         int cache_reply,
 603                         struct rpc_task *task)
 604 {
 605         struct nfs4_session *session = nfs4_get_session(server);
 606         int ret = 0;
 607
 608         if (session == NULL) {
 609                 args->sa_session = NULL;
 610                 res->sr_session = NULL;
 611                 goto out;
 612         }
 613
 614         dprintk("--> %s clp %p session %p sr_slot %td\n",
 615                 __func__, session->clp, session, res->sr_slot ?
 616                         res->sr_slot - session->fc_slot_table.slots : -1);
 617
 618         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 619                                    task);
 620 out:
 621         dprintk("<-- %s status=%d\n", __func__, ret);
 622         return ret;
 623 }
 624
 625 struct nfs41_call_sync_data {
 626         const struct nfs_server *seq_server;
 627         struct nfs4_sequence_args *seq_args;
 628         struct nfs4_sequence_res *seq_res;
 629         int cache_reply;
 630 };
 631
 632 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 633 {
 634         struct nfs41_call_sync_data *data = calldata;
 635
 636         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 637
 638         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 639                                 data->seq_res, data->cache_reply, task))
 640                 return;
 641         rpc_call_start(task);
 642 }
 643
 644 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 645 {
 646         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 647         nfs41_call_sync_prepare(task, calldata);
 648 }
 649
 650 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 651 {
 652         struct nfs41_call_sync_data *data = calldata;
 653
 654         nfs41_sequence_done(task, data->seq_res);
 655 }
 656
 657 struct rpc_call_ops nfs41_call_sync_ops = {
 658         .rpc_call_prepare = nfs41_call_sync_prepare,
 659         .rpc_call_done = nfs41_call_sync_done,
 660 };
 661
 662 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 663         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 664         .rpc_call_done = nfs41_call_sync_done,
 665 };
 666
 667 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 668                                    struct nfs_server *server,
 669                                    struct rpc_message *msg,
 670                                    struct nfs4_sequence_args *args,
 671                                    struct nfs4_sequence_res *res,
 672                                    int cache_reply,
 673                                    int privileged)
 674 {
 675         int ret;
 676         struct rpc_task *task;
 677         struct nfs41_call_sync_data data = {
 678                 .seq_server = server,
 679                 .seq_args = args,
 680                 .seq_res = res,
 681                 .cache_reply = cache_reply,
 682         };
 683         struct rpc_task_setup task_setup = {
 684                 .rpc_client = clnt,
 685                 .rpc_message = msg,
 686                 .callback_ops = &nfs41_call_sync_ops,
 687                 .callback_data = &data
 688         };
 689
 690         res->sr_slot = NULL;
 691         if (privileged)
 692                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 693         task = rpc_run_task(&task_setup);
 694         if (IS_ERR(task))
 695                 ret = PTR_ERR(task);
 696         else {
 697                 ret = task->tk_status;
 698                 rpc_put_task(task);
 699         }
 700         return ret;
 701 }
 702
 703 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 704                             struct nfs_server *server,
 705                             struct rpc_message *msg,
 706                             struct nfs4_sequence_args *args,
 707                             struct nfs4_sequence_res *res,
 708                             int cache_reply)
 709 {
 710         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 711 }
 712
 713 #else
 714 static int nfs4_sequence_done(struct rpc_task *task,
 715                                struct nfs4_sequence_res *res)
 716 {
 717         return 1;
 718 }
 719 #endif /* CONFIG_NFS_V4_1 */
 720
 721 int _nfs4_call_sync(struct rpc_clnt *clnt,
 722                     struct nfs_server *server,
 723                     struct rpc_message *msg,
 724                     struct nfs4_sequence_args *args,
 725                     struct nfs4_sequence_res *res,
 726                     int cache_reply)
 727 {
 728         args->sa_session = res->sr_session = NULL;
 729         return rpc_call_sync(clnt, msg, 0);
 730 }
 731
 732 static inline
 733 int nfs4_call_sync(struct rpc_clnt *clnt,
 734                    struct nfs_server *server,
 735                    struct rpc_message *msg,
 736                    struct nfs4_sequence_args *args,
 737                    struct nfs4_sequence_res *res,
 738                    int cache_reply)
 739 {
 740         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 741                                                 args, res, cache_reply);
 742 }
 743
 744 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 745 {
 746         struct nfs_inode *nfsi = NFS_I(dir);
 747
 748         spin_lock(&dir->i_lock);
 749         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 750         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 751                 nfs_force_lookup_revalidate(dir);
 752         nfsi->change_attr = cinfo->after;
 753         spin_unlock(&dir->i_lock);
 754 }
 755
 756 struct nfs4_opendata {
 757         struct kref kref;
 758         struct nfs_openargs o_arg;
 759         struct nfs_openres o_res;
 760         struct nfs_open_confirmargs c_arg;
 761         struct nfs_open_confirmres c_res;
 762         struct nfs_fattr f_attr;
 763         struct nfs_fattr dir_attr;
 764         struct path path;
 765         struct dentry *dir;
 766         struct nfs4_state_owner *owner;
 767         struct nfs4_state *state;
 768         struct iattr attrs;
 769         unsigned long timestamp;
 770         unsigned int rpc_done : 1;
 771         int rpc_status;
 772         int cancelled;
 773 };
 774
 775
 776 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 777 {
 778         p->o_res.f_attr = &p->f_attr;
 779         p->o_res.dir_attr = &p->dir_attr;
 780         p->o_res.seqid = p->o_arg.seqid;
 781         p->c_res.seqid = p->c_arg.seqid;
 782         p->o_res.server = p->o_arg.server;
 783         nfs_fattr_init(&p->f_attr);
 784         nfs_fattr_init(&p->dir_attr);
 785 }
 786
 787 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 788                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 789                 const struct iattr *attrs,
 790                 gfp_t gfp_mask)
 791 {
 792         struct dentry *parent = dget_parent(path->dentry);
 793         struct inode *dir = parent->d_inode;
 794         struct nfs_server *server = NFS_SERVER(dir);
 795         struct nfs4_opendata *p;
 796
 797         p = kzalloc(sizeof(*p), gfp_mask);
 798         if (p == NULL)
 799                 goto err;
 800         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 801         if (p->o_arg.seqid == NULL)
 802                 goto err_free;
 803         path_get(path);
 804         p->path = *path;
 805         p->dir = parent;
 806         p->owner = sp;
 807         atomic_inc(&sp->so_count);
 808         p->o_arg.fh = NFS_FH(dir);
 809         p->o_arg.open_flags = flags;
 810         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 811         p->o_arg.clientid = server->nfs_client->cl_clientid;
 812         p->o_arg.id = sp->so_owner_id.id;
 813         p->o_arg.name = &p->path.dentry->d_name;
 814         p->o_arg.server = server;
 815         p->o_arg.bitmask = server->attr_bitmask;
 816         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 817         if (flags & O_CREAT) {
 818                 u32 *s;
 819
 820                 p->o_arg.u.attrs = &p->attrs;
 821                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 822                 s = (u32 *) p->o_arg.u.verifier.data;
 823                 s[0] = jiffies;
 824                 s[1] = current->pid;
 825         }
 826         p->c_arg.fh = &p->o_res.fh;
 827         p->c_arg.stateid = &p->o_res.stateid;
 828         p->c_arg.seqid = p->o_arg.seqid;
 829         nfs4_init_opendata_res(p);
 830         kref_init(&p->kref);
 831         return p;
 832 err_free:
 833         kfree(p);
 834 err:
 835         dput(parent);
 836         return NULL;
 837 }
 838
 839 static void nfs4_opendata_free(struct kref *kref)
 840 {
 841         struct nfs4_opendata *p = container_of(kref,
 842                         struct nfs4_opendata, kref);
 843
 844         nfs_free_seqid(p->o_arg.seqid);
 845         if (p->state != NULL)
 846                 nfs4_put_open_state(p->state);
 847         nfs4_put_state_owner(p->owner);
 848         dput(p->dir);
 849         path_put(&p->path);
 850         kfree(p);
 851 }
 852
 853 static void nfs4_opendata_put(struct nfs4_opendata *p)
 854 {
 855         if (p != NULL)
 856                 kref_put(&p->kref, nfs4_opendata_free);
 857 }
 858
 859 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 860 {
 861         int ret;
 862
 863         ret = rpc_wait_for_completion_task(task);
 864         return ret;
 865 }
 866
 867 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 868 {
 869         int ret = 0;
 870
 871         if (open_mode & O_EXCL)
 872                 goto out;
 873         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 874                 case FMODE_READ:
 875                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 876                                 && state->n_rdonly != 0;
 877                         break;
 878                 case FMODE_WRITE:
 879                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 880                                 && state->n_wronly != 0;
 881                         break;
 882                 case FMODE_READ|FMODE_WRITE:
 883                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 884                                 && state->n_rdwr != 0;
 885         }
 886 out:
 887         return ret;
 888 }
 889
 890 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 891 {
 892         if ((delegation->type & fmode) != fmode)
 893                 return 0;
 894         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 895                 return 0;
 896         nfs_mark_delegation_referenced(delegation);
 897         return 1;
 898 }
 899
 900 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 901 {
 902         switch (fmode) {
 903                 case FMODE_WRITE:
 904                         state->n_wronly++;
 905                         break;
 906                 case FMODE_READ:
 907                         state->n_rdonly++;
 908                         break;
 909                 case FMODE_READ|FMODE_WRITE:
 910                         state->n_rdwr++;
 911         }
 912         nfs4_state_set_mode_locked(state, state->state | fmode);
 913 }
 914
 915 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 916 {
 917         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 918                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 919         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 920         switch (fmode) {
 921                 case FMODE_READ:
 922                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 923                         break;
 924                 case FMODE_WRITE:
 925                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 926                         break;
 927                 case FMODE_READ|FMODE_WRITE:
 928                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 929         }
 930 }
 931
 932 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 933 {
 934         write_seqlock(&state->seqlock);
 935         nfs_set_open_stateid_locked(state, stateid, fmode);
 936         write_sequnlock(&state->seqlock);
 937 }
 938
 939 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 940 {
 941         /*
 942          * Protect the call to nfs4_state_set_mode_locked and
 943          * serialise the stateid update
 944          */
 945         write_seqlock(&state->seqlock);
 946         if (deleg_stateid != NULL) {
 947                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 948                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 949         }
 950         if (open_stateid != NULL)
 951                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 952         write_sequnlock(&state->seqlock);
 953         spin_lock(&state->owner->so_lock);
 954         update_open_stateflags(state, fmode);
 955         spin_unlock(&state->owner->so_lock);
 956 }
 957
 958 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 959 {
 960         struct nfs_inode *nfsi = NFS_I(state->inode);
 961         struct nfs_delegation *deleg_cur;
 962         int ret = 0;
 963
 964         fmode &= (FMODE_READ|FMODE_WRITE);
 965
 966         rcu_read_lock();
 967         deleg_cur = rcu_dereference(nfsi->delegation);
 968         if (deleg_cur == NULL)
 969                 goto no_delegation;
 970
 971         spin_lock(&deleg_cur->lock);
 972         if (nfsi->delegation != deleg_cur ||
 973             (deleg_cur->type & fmode) != fmode)
 974                 goto no_delegation_unlock;
 975
 976         if (delegation == NULL)
 977                 delegation = &deleg_cur->stateid;
 978         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 979                 goto no_delegation_unlock;
 980
 981         nfs_mark_delegation_referenced(deleg_cur);
 982         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 983         ret = 1;
 984 no_delegation_unlock:
 985         spin_unlock(&deleg_cur->lock);
 986 no_delegation:
 987         rcu_read_unlock();
 988
 989         if (!ret && open_stateid != NULL) {
 990                 __update_open_stateid(state, open_stateid, NULL, fmode);
 991                 ret = 1;
 992         }
 993
 994         return ret;
 995 }
 996
 997
 998 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 999 {
1000         struct nfs_delegation *delegation;
1001
1002         rcu_read_lock();
1003         delegation = rcu_dereference(NFS_I(inode)->delegation);
1004         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1005                 rcu_read_unlock();
1006                 return;
1007         }
1008         rcu_read_unlock();
1009         nfs_inode_return_delegation(inode);
1010 }
1011
1012 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1013 {
1014         struct nfs4_state *state = opendata->state;
1015         struct nfs_inode *nfsi = NFS_I(state->inode);
1016         struct nfs_delegation *delegation;
1017         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1018         fmode_t fmode = opendata->o_arg.fmode;
1019         nfs4_stateid stateid;
1020         int ret = -EAGAIN;
1021
1022         for (;;) {
1023                 if (can_open_cached(state, fmode, open_mode)) {
1024                         spin_lock(&state->owner->so_lock);
1025                         if (can_open_cached(state, fmode, open_mode)) {
1026                                 update_open_stateflags(state, fmode);
1027                                 spin_unlock(&state->owner->so_lock);
1028                                 goto out_return_state;
1029                         }
1030                         spin_unlock(&state->owner->so_lock);
1031                 }
1032                 rcu_read_lock();
1033                 delegation = rcu_dereference(nfsi->delegation);
1034                 if (delegation == NULL ||
1035                     !can_open_delegated(delegation, fmode)) {
1036                         rcu_read_unlock();
1037                         break;
1038                 }
1039                 /* Save the delegation */
1040                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1041                 rcu_read_unlock();
1042                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1043                 if (ret != 0)
1044                         goto out;
1045                 ret = -EAGAIN;
1046
1047                 /* Try to update the stateid using the delegation */
1048                 if (update_open_stateid(state, NULL, &stateid, fmode))
1049                         goto out_return_state;
1050         }
1051 out:
1052         return ERR_PTR(ret);
1053 out_return_state:
1054         atomic_inc(&state->count);
1055         return state;
1056 }
1057
1058 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1059 {
1060         struct inode *inode;
1061         struct nfs4_state *state = NULL;
1062         struct nfs_delegation *delegation;
1063         int ret;
1064
1065         if (!data->rpc_done) {
1066                 state = nfs4_try_open_cached(data);
1067                 goto out;
1068         }
1069
1070         ret = -EAGAIN;
1071         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1072                 goto err;
1073         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1074         ret = PTR_ERR(inode);
1075         if (IS_ERR(inode))
1076                 goto err;
1077         ret = -ENOMEM;
1078         state = nfs4_get_open_state(inode, data->owner);
1079         if (state == NULL)
1080                 goto err_put_inode;
1081         if (data->o_res.delegation_type != 0) {
1082                 int delegation_flags = 0;
1083
1084                 rcu_read_lock();
1085                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1086                 if (delegation)
1087                         delegation_flags = delegation->flags;
1088                 rcu_read_unlock();
1089                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1090                         nfs_inode_set_delegation(state->inode,
1091                                         data->owner->so_cred,
1092                                         &data->o_res);
1093                 else
1094                         nfs_inode_reclaim_delegation(state->inode,
1095                                         data->owner->so_cred,
1096                                         &data->o_res);
1097         }
1098
1099         update_open_stateid(state, &data->o_res.stateid, NULL,
1100                         data->o_arg.fmode);
1101         iput(inode);
1102 out:
1103         return state;
1104 err_put_inode:
1105         iput(inode);
1106 err:
1107         return ERR_PTR(ret);
1108 }
1109
1110 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1111 {
1112         struct nfs_inode *nfsi = NFS_I(state->inode);
1113         struct nfs_open_context *ctx;
1114
1115         spin_lock(&state->inode->i_lock);
1116         list_for_each_entry(ctx, &nfsi->open_files, list) {
1117                 if (ctx->state != state)
1118                         continue;
1119                 get_nfs_open_context(ctx);
1120                 spin_unlock(&state->inode->i_lock);
1121                 return ctx;
1122         }
1123         spin_unlock(&state->inode->i_lock);
1124         return ERR_PTR(-ENOENT);
1125 }
1126
1127 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1128 {
1129         struct nfs4_opendata *opendata;
1130
1131         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1132         if (opendata == NULL)
1133                 return ERR_PTR(-ENOMEM);
1134         opendata->state = state;
1135         atomic_inc(&state->count);
1136         return opendata;
1137 }
1138
1139 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1140 {
1141         struct nfs4_state *newstate;
1142         int ret;
1143
1144         opendata->o_arg.open_flags = 0;
1145         opendata->o_arg.fmode = fmode;
1146         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1147         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1148         nfs4_init_opendata_res(opendata);
1149         ret = _nfs4_recover_proc_open(opendata);
1150         if (ret != 0)
1151                 return ret;
1152         newstate = nfs4_opendata_to_nfs4_state(opendata);
1153         if (IS_ERR(newstate))
1154                 return PTR_ERR(newstate);
1155         nfs4_close_state(&opendata->path, newstate, fmode);
1156         *res = newstate;
1157         return 0;
1158 }
1159
1160 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1161 {
1162         struct nfs4_state *newstate;
1163         int ret;
1164
1165         /* memory barrier prior to reading state->n_* */
1166         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1167         smp_rmb();
1168         if (state->n_rdwr != 0) {
1169                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1170                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1171                 if (ret != 0)
1172                         return ret;
1173                 if (newstate != state)
1174                         return -ESTALE;
1175         }
1176         if (state->n_wronly != 0) {
1177                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1178                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1179                 if (ret != 0)
1180                         return ret;
1181                 if (newstate != state)
1182                         return -ESTALE;
1183         }
1184         if (state->n_rdonly != 0) {
1185                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1186                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1187                 if (ret != 0)
1188                         return ret;
1189                 if (newstate != state)
1190                         return -ESTALE;
1191         }
1192         /*
1193          * We may have performed cached opens for all three recoveries.
1194          * Check if we need to update the current stateid.
1195          */
1196         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1197             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1198                 write_seqlock(&state->seqlock);
1199                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1200                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1201                 write_sequnlock(&state->seqlock);
1202         }
1203         return 0;
1204 }
1205
1206 /*
1207  * OPEN_RECLAIM:
1208  *      reclaim state on the server after a reboot.
1209  */
1210 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1211 {
1212         struct nfs_delegation *delegation;
1213         struct nfs4_opendata *opendata;
1214         fmode_t delegation_type = 0;
1215         int status;
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_PREVIOUS;
1221         opendata->o_arg.fh = NFS_FH(state->inode);
1222         rcu_read_lock();
1223         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1224         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1225                 delegation_type = delegation->type;
1226         rcu_read_unlock();
1227         opendata->o_arg.u.delegation_type = delegation_type;
1228         status = nfs4_open_recover(opendata, state);
1229         nfs4_opendata_put(opendata);
1230         return status;
1231 }
1232
1233 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1234 {
1235         struct nfs_server *server = NFS_SERVER(state->inode);
1236         struct nfs4_exception exception = { };
1237         int err;
1238         do {
1239                 err = _nfs4_do_open_reclaim(ctx, state);
1240                 if (err != -NFS4ERR_DELAY)
1241                         break;
1242                 nfs4_handle_exception(server, err, &exception);
1243         } while (exception.retry);
1244         return err;
1245 }
1246
1247 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1248 {
1249         struct nfs_open_context *ctx;
1250         int ret;
1251
1252         ctx = nfs4_state_find_open_context(state);
1253         if (IS_ERR(ctx))
1254                 return PTR_ERR(ctx);
1255         ret = nfs4_do_open_reclaim(ctx, state);
1256         put_nfs_open_context(ctx);
1257         return ret;
1258 }
1259
1260 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1261 {
1262         struct nfs4_opendata *opendata;
1263         int ret;
1264
1265         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1266         if (IS_ERR(opendata))
1267                 return PTR_ERR(opendata);
1268         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1269         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1270                         sizeof(opendata->o_arg.u.delegation.data));
1271         ret = nfs4_open_recover(opendata, state);
1272         nfs4_opendata_put(opendata);
1273         return ret;
1274 }
1275
1276 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1277 {
1278         struct nfs4_exception exception = { };
1279         struct nfs_server *server = NFS_SERVER(state->inode);
1280         int err;
1281         do {
1282                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1283                 switch (err) {
1284                         case 0:
1285                         case -ENOENT:
1286                         case -ESTALE:
1287                                 goto out;
1288                         case -NFS4ERR_BADSESSION:
1289                         case -NFS4ERR_BADSLOT:
1290                         case -NFS4ERR_BAD_HIGH_SLOT:
1291                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1292                         case -NFS4ERR_DEADSESSION:
1293                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1294                                 goto out;
1295                         case -NFS4ERR_STALE_CLIENTID:
1296                         case -NFS4ERR_STALE_STATEID:
1297                         case -NFS4ERR_EXPIRED:
1298                                 /* Don't recall a delegation if it was lost */
1299                                 nfs4_schedule_lease_recovery(server->nfs_client);
1300                                 goto out;
1301                         case -ERESTARTSYS:
1302                                 /*
1303                                  * The show must go on: exit, but mark the
1304                                  * stateid as needing recovery.
1305                                  */
1306                         case -NFS4ERR_ADMIN_REVOKED:
1307                         case -NFS4ERR_BAD_STATEID:
1308                                 nfs4_schedule_stateid_recovery(server, state);
1309                         case -EKEYEXPIRED:
1310                                 /*
1311                                  * User RPCSEC_GSS context has expired.
1312                                  * We cannot recover this stateid now, so
1313                                  * skip it and allow recovery thread to
1314                                  * proceed.
1315                                  */
1316                         case -ENOMEM:
1317                                 err = 0;
1318                                 goto out;
1319                 }
1320                 err = nfs4_handle_exception(server, err, &exception);
1321         } while (exception.retry);
1322 out:
1323         return err;
1324 }
1325
1326 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1327 {
1328         struct nfs4_opendata *data = calldata;
1329
1330         data->rpc_status = task->tk_status;
1331         if (data->rpc_status == 0) {
1332                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1333                                 sizeof(data->o_res.stateid.data));
1334                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1335                 renew_lease(data->o_res.server, data->timestamp);
1336                 data->rpc_done = 1;
1337         }
1338 }
1339
1340 static void nfs4_open_confirm_release(void *calldata)
1341 {
1342         struct nfs4_opendata *data = calldata;
1343         struct nfs4_state *state = NULL;
1344
1345         /* If this request hasn't been cancelled, do nothing */
1346         if (data->cancelled == 0)
1347                 goto out_free;
1348         /* In case of error, no cleanup! */
1349         if (!data->rpc_done)
1350                 goto out_free;
1351         state = nfs4_opendata_to_nfs4_state(data);
1352         if (!IS_ERR(state))
1353                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1354 out_free:
1355         nfs4_opendata_put(data);
1356 }
1357
1358 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1359         .rpc_call_done = nfs4_open_confirm_done,
1360         .rpc_release = nfs4_open_confirm_release,
1361 };
1362
1363 /*
1364  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1365  */
1366 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1367 {
1368         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1369         struct rpc_task *task;
1370         struct  rpc_message msg = {
1371                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1372                 .rpc_argp = &data->c_arg,
1373                 .rpc_resp = &data->c_res,
1374                 .rpc_cred = data->owner->so_cred,
1375         };
1376         struct rpc_task_setup task_setup_data = {
1377                 .rpc_client = server->client,
1378                 .rpc_message = &msg,
1379                 .callback_ops = &nfs4_open_confirm_ops,
1380                 .callback_data = data,
1381                 .workqueue = nfsiod_workqueue,
1382                 .flags = RPC_TASK_ASYNC,
1383         };
1384         int status;
1385
1386         kref_get(&data->kref);
1387         data->rpc_done = 0;
1388         data->rpc_status = 0;
1389         data->timestamp = jiffies;
1390         task = rpc_run_task(&task_setup_data);
1391         if (IS_ERR(task))
1392                 return PTR_ERR(task);
1393         status = nfs4_wait_for_completion_rpc_task(task);
1394         if (status != 0) {
1395                 data->cancelled = 1;
1396                 smp_wmb();
1397         } else
1398                 status = data->rpc_status;
1399         rpc_put_task(task);
1400         return status;
1401 }
1402
1403 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1404 {
1405         struct nfs4_opendata *data = calldata;
1406         struct nfs4_state_owner *sp = data->owner;
1407
1408         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1409                 return;
1410         /*
1411          * Check if we still need to send an OPEN call, or if we can use
1412          * a delegation instead.
1413          */
1414         if (data->state != NULL) {
1415                 struct nfs_delegation *delegation;
1416
1417                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1418                         goto out_no_action;
1419                 rcu_read_lock();
1420                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1421                 if (delegation != NULL &&
1422                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1423                         rcu_read_unlock();
1424                         goto out_no_action;
1425                 }
1426                 rcu_read_unlock();
1427         }
1428         /* Update sequence id. */
1429         data->o_arg.id = sp->so_owner_id.id;
1430         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1431         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1432                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1433                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1434         }
1435         data->timestamp = jiffies;
1436         if (nfs4_setup_sequence(data->o_arg.server,
1437                                 &data->o_arg.seq_args,
1438                                 &data->o_res.seq_res, 1, task))
1439                 return;
1440         rpc_call_start(task);
1441         return;
1442 out_no_action:
1443         task->tk_action = NULL;
1444
1445 }
1446
1447 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1448 {
1449         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1450         nfs4_open_prepare(task, calldata);
1451 }
1452
1453 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1454 {
1455         struct nfs4_opendata *data = calldata;
1456
1457         data->rpc_status = task->tk_status;
1458
1459         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1460                 return;
1461
1462         if (task->tk_status == 0) {
1463                 switch (data->o_res.f_attr->mode & S_IFMT) {
1464                         case S_IFREG:
1465                                 break;
1466                         case S_IFLNK:
1467                                 data->rpc_status = -ELOOP;
1468                                 break;
1469                         case S_IFDIR:
1470                                 data->rpc_status = -EISDIR;
1471                                 break;
1472                         default:
1473                                 data->rpc_status = -ENOTDIR;
1474                 }
1475                 renew_lease(data->o_res.server, data->timestamp);
1476                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1477                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1478         }
1479         data->rpc_done = 1;
1480 }
1481
1482 static void nfs4_open_release(void *calldata)
1483 {
1484         struct nfs4_opendata *data = calldata;
1485         struct nfs4_state *state = NULL;
1486
1487         /* If this request hasn't been cancelled, do nothing */
1488         if (data->cancelled == 0)
1489                 goto out_free;
1490         /* In case of error, no cleanup! */
1491         if (data->rpc_status != 0 || !data->rpc_done)
1492                 goto out_free;
1493         /* In case we need an open_confirm, no cleanup! */
1494         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1495                 goto out_free;
1496         state = nfs4_opendata_to_nfs4_state(data);
1497         if (!IS_ERR(state))
1498                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1499 out_free:
1500         nfs4_opendata_put(data);
1501 }
1502
1503 static const struct rpc_call_ops nfs4_open_ops = {
1504         .rpc_call_prepare = nfs4_open_prepare,
1505         .rpc_call_done = nfs4_open_done,
1506         .rpc_release = nfs4_open_release,
1507 };
1508
1509 static const struct rpc_call_ops nfs4_recover_open_ops = {
1510         .rpc_call_prepare = nfs4_recover_open_prepare,
1511         .rpc_call_done = nfs4_open_done,
1512         .rpc_release = nfs4_open_release,
1513 };
1514
1515 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1516 {
1517         struct inode *dir = data->dir->d_inode;
1518         struct nfs_server *server = NFS_SERVER(dir);
1519         struct nfs_openargs *o_arg = &data->o_arg;
1520         struct nfs_openres *o_res = &data->o_res;
1521         struct rpc_task *task;
1522         struct rpc_message msg = {
1523                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1524                 .rpc_argp = o_arg,
1525                 .rpc_resp = o_res,
1526                 .rpc_cred = data->owner->so_cred,
1527         };
1528         struct rpc_task_setup task_setup_data = {
1529                 .rpc_client = server->client,
1530                 .rpc_message = &msg,
1531                 .callback_ops = &nfs4_open_ops,
1532                 .callback_data = data,
1533                 .workqueue = nfsiod_workqueue,
1534                 .flags = RPC_TASK_ASYNC,
1535         };
1536         int status;
1537
1538         kref_get(&data->kref);
1539         data->rpc_done = 0;
1540         data->rpc_status = 0;
1541         data->cancelled = 0;
1542         if (isrecover)
1543                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1544         task = rpc_run_task(&task_setup_data);
1545         if (IS_ERR(task))
1546                 return PTR_ERR(task);
1547         status = nfs4_wait_for_completion_rpc_task(task);
1548         if (status != 0) {
1549                 data->cancelled = 1;
1550                 smp_wmb();
1551         } else
1552                 status = data->rpc_status;
1553         rpc_put_task(task);
1554
1555         return status;
1556 }
1557
1558 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1559 {
1560         struct inode *dir = data->dir->d_inode;
1561         struct nfs_openres *o_res = &data->o_res;
1562         int status;
1563
1564         status = nfs4_run_open_task(data, 1);
1565         if (status != 0 || !data->rpc_done)
1566                 return status;
1567
1568         nfs_refresh_inode(dir, o_res->dir_attr);
1569
1570         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1571                 status = _nfs4_proc_open_confirm(data);
1572                 if (status != 0)
1573                         return status;
1574         }
1575
1576         return status;
1577 }
1578
1579 /*
1580  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1581  */
1582 static int _nfs4_proc_open(struct nfs4_opendata *data)
1583 {
1584         struct inode *dir = data->dir->d_inode;
1585         struct nfs_server *server = NFS_SERVER(dir);
1586         struct nfs_openargs *o_arg = &data->o_arg;
1587         struct nfs_openres *o_res = &data->o_res;
1588         int status;
1589
1590         status = nfs4_run_open_task(data, 0);
1591         if (status != 0 || !data->rpc_done)
1592                 return status;
1593
1594         if (o_arg->open_flags & O_CREAT) {
1595                 update_changeattr(dir, &o_res->cinfo);
1596                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1597         } else
1598                 nfs_refresh_inode(dir, o_res->dir_attr);
1599         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1600                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1601         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1602                 status = _nfs4_proc_open_confirm(data);
1603                 if (status != 0)
1604                         return status;
1605         }
1606         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1607                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1608         return 0;
1609 }
1610
1611 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1612 {
1613         unsigned int loop;
1614         int ret;
1615
1616         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1617                 ret = nfs4_wait_clnt_recover(clp);
1618                 if (ret != 0)
1619                         break;
1620                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1621                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1622                         break;
1623                 nfs4_schedule_state_manager(clp);
1624                 ret = -EIO;
1625         }
1626         return ret;
1627 }
1628
1629 static int nfs4_recover_expired_lease(struct nfs_server *server)
1630 {
1631         return nfs4_client_recover_expired_lease(server->nfs_client);
1632 }
1633
1634 /*
1635  * OPEN_EXPIRED:
1636  *      reclaim state on the server after a network partition.
1637  *      Assumes caller holds the appropriate lock
1638  */
1639 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1640 {
1641         struct nfs4_opendata *opendata;
1642         int ret;
1643
1644         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1645         if (IS_ERR(opendata))
1646                 return PTR_ERR(opendata);
1647         ret = nfs4_open_recover(opendata, state);
1648         if (ret == -ESTALE)
1649                 d_drop(ctx->path.dentry);
1650         nfs4_opendata_put(opendata);
1651         return ret;
1652 }
1653
1654 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1655 {
1656         struct nfs_server *server = NFS_SERVER(state->inode);
1657         struct nfs4_exception exception = { };
1658         int err;
1659
1660         do {
1661                 err = _nfs4_open_expired(ctx, state);
1662                 switch (err) {
1663                 default:
1664                         goto out;
1665                 case -NFS4ERR_GRACE:
1666                 case -NFS4ERR_DELAY:
1667                         nfs4_handle_exception(server, err, &exception);
1668                         err = 0;
1669                 }
1670         } while (exception.retry);
1671 out:
1672         return err;
1673 }
1674
1675 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1676 {
1677         struct nfs_open_context *ctx;
1678         int ret;
1679
1680         ctx = nfs4_state_find_open_context(state);
1681         if (IS_ERR(ctx))
1682                 return PTR_ERR(ctx);
1683         ret = nfs4_do_open_expired(ctx, state);
1684         put_nfs_open_context(ctx);
1685         return ret;
1686 }
1687
1688 /*
1689  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1690  * fields corresponding to attributes that were used to store the verifier.
1691  * Make sure we clobber those fields in the later setattr call
1692  */
1693 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1694 {
1695         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1696             !(sattr->ia_valid & ATTR_ATIME_SET))
1697                 sattr->ia_valid |= ATTR_ATIME;
1698
1699         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1700             !(sattr->ia_valid & ATTR_MTIME_SET))
1701                 sattr->ia_valid |= ATTR_MTIME;
1702 }
1703
1704 /*
1705  * Returns a referenced nfs4_state
1706  */
1707 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)
1708 {
1709         struct nfs4_state_owner  *sp;
1710         struct nfs4_state     *state = NULL;
1711         struct nfs_server       *server = NFS_SERVER(dir);
1712         struct nfs4_opendata *opendata;
1713         int status;
1714
1715         /* Protect against reboot recovery conflicts */
1716         status = -ENOMEM;
1717         if (!(sp = nfs4_get_state_owner(server, cred))) {
1718                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1719                 goto out_err;
1720         }
1721         status = nfs4_recover_expired_lease(server);
1722         if (status != 0)
1723                 goto err_put_state_owner;
1724         if (path->dentry->d_inode != NULL)
1725                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1726         status = -ENOMEM;
1727         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1728         if (opendata == NULL)
1729                 goto err_put_state_owner;
1730
1731         if (path->dentry->d_inode != NULL)
1732                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1733
1734         status = _nfs4_proc_open(opendata);
1735         if (status != 0)
1736                 goto err_opendata_put;
1737
1738         state = nfs4_opendata_to_nfs4_state(opendata);
1739         status = PTR_ERR(state);
1740         if (IS_ERR(state))
1741                 goto err_opendata_put;
1742         if (server->caps & NFS_CAP_POSIX_LOCK)
1743                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1744
1745         if (opendata->o_arg.open_flags & O_EXCL) {
1746                 nfs4_exclusive_attrset(opendata, sattr);
1747
1748                 nfs_fattr_init(opendata->o_res.f_attr);
1749                 status = nfs4_do_setattr(state->inode, cred,
1750                                 opendata->o_res.f_attr, sattr,
1751                                 state);
1752                 if (status == 0)
1753                         nfs_setattr_update_inode(state->inode, sattr);
1754                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1755         }
1756         nfs4_opendata_put(opendata);
1757         nfs4_put_state_owner(sp);
1758         *res = state;
1759         return 0;
1760 err_opendata_put:
1761         nfs4_opendata_put(opendata);
1762 err_put_state_owner:
1763         nfs4_put_state_owner(sp);
1764 out_err:
1765         *res = NULL;
1766         return status;
1767 }
1768
1769
1770 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)
1771 {
1772         struct nfs4_exception exception = { };
1773         struct nfs4_state *res;
1774         int status;
1775
1776         do {
1777                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1778                 if (status == 0)
1779                         break;
1780                 /* NOTE: BAD_SEQID means the server and client disagree about the
1781                  * book-keeping w.r.t. state-changing operations
1782                  * (OPEN/CLOSE/LOCK/LOCKU...)
1783                  * It is actually a sign of a bug on the client or on the server.
1784                  *
1785                  * If we receive a BAD_SEQID error in the particular case of
1786                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1787                  * have unhashed the old state_owner for us, and that we can
1788                  * therefore safely retry using a new one. We should still warn
1789                  * the user though...
1790                  */
1791                 if (status == -NFS4ERR_BAD_SEQID) {
1792                         printk(KERN_WARNING "NFS: v4 server %s "
1793                                         " returned a bad sequence-id error!\n",
1794                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1795                         exception.retry = 1;
1796                         continue;
1797                 }
1798                 /*
1799                  * BAD_STATEID on OPEN means that the server cancelled our
1800                  * state before it received the OPEN_CONFIRM.
1801                  * Recover by retrying the request as per the discussion
1802                  * on Page 181 of RFC3530.
1803                  */
1804                 if (status == -NFS4ERR_BAD_STATEID) {
1805                         exception.retry = 1;
1806                         continue;
1807                 }
1808                 if (status == -EAGAIN) {
1809                         /* We must have found a delegation */
1810                         exception.retry = 1;
1811                         continue;
1812                 }
1813                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1814                                         status, &exception));
1815         } while (exception.retry);
1816         return res;
1817 }
1818
1819 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1820                             struct nfs_fattr *fattr, struct iattr *sattr,
1821                             struct nfs4_state *state)
1822 {
1823         struct nfs_server *server = NFS_SERVER(inode);
1824         struct nfs_setattrargs  arg = {
1825                 .fh             = NFS_FH(inode),
1826                 .iap            = sattr,
1827                 .server         = server,
1828                 .bitmask = server->attr_bitmask,
1829         };
1830         struct nfs_setattrres  res = {
1831                 .fattr          = fattr,
1832                 .server         = server,
1833         };
1834         struct rpc_message msg = {
1835                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1836                 .rpc_argp       = &arg,
1837                 .rpc_resp       = &res,
1838                 .rpc_cred       = cred,
1839         };
1840         unsigned long timestamp = jiffies;
1841         int status;
1842
1843         nfs_fattr_init(fattr);
1844
1845         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1846                 /* Use that stateid */
1847         } else if (state != NULL) {
1848                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1849         } else
1850                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1851
1852         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1853         if (status == 0 && state != NULL)
1854                 renew_lease(server, timestamp);
1855         return status;
1856 }
1857
1858 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1859                            struct nfs_fattr *fattr, struct iattr *sattr,
1860                            struct nfs4_state *state)
1861 {
1862         struct nfs_server *server = NFS_SERVER(inode);
1863         struct nfs4_exception exception = { };
1864         int err;
1865         do {
1866                 err = nfs4_handle_exception(server,
1867                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1868                                 &exception);
1869         } while (exception.retry);
1870         return err;
1871 }
1872
1873 struct nfs4_closedata {
1874         struct path path;
1875         struct inode *inode;
1876         struct nfs4_state *state;
1877         struct nfs_closeargs arg;
1878         struct nfs_closeres res;
1879         struct nfs_fattr fattr;
1880         unsigned long timestamp;
1881         bool roc;
1882         u32 roc_barrier;
1883 };
1884
1885 static void nfs4_free_closedata(void *data)
1886 {
1887         struct nfs4_closedata *calldata = data;
1888         struct nfs4_state_owner *sp = calldata->state->owner;
1889
1890         if (calldata->roc)
1891                 pnfs_roc_release(calldata->state->inode);
1892         nfs4_put_open_state(calldata->state);
1893         nfs_free_seqid(calldata->arg.seqid);
1894         nfs4_put_state_owner(sp);
1895         path_put(&calldata->path);
1896         kfree(calldata);
1897 }
1898
1899 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1900                 fmode_t fmode)
1901 {
1902         spin_lock(&state->owner->so_lock);
1903         if (!(fmode & FMODE_READ))
1904                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1905         if (!(fmode & FMODE_WRITE))
1906                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1907         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1908         spin_unlock(&state->owner->so_lock);
1909 }
1910
1911 static void nfs4_close_done(struct rpc_task *task, void *data)
1912 {
1913         struct nfs4_closedata *calldata = data;
1914         struct nfs4_state *state = calldata->state;
1915         struct nfs_server *server = NFS_SERVER(calldata->inode);
1916
1917         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1918                 return;
1919         /* hmm. we are done with the inode, and in the process of freeing
1920          * the state_owner. we keep this around to process errors
1921          */
1922         switch (task->tk_status) {
1923                 case 0:
1924                         if (calldata->roc)
1925                                 pnfs_roc_set_barrier(state->inode,
1926                                                      calldata->roc_barrier);
1927                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1928                         renew_lease(server, calldata->timestamp);
1929                         nfs4_close_clear_stateid_flags(state,
1930                                         calldata->arg.fmode);
1931                         break;
1932                 case -NFS4ERR_STALE_STATEID:
1933                 case -NFS4ERR_OLD_STATEID:
1934                 case -NFS4ERR_BAD_STATEID:
1935                 case -NFS4ERR_EXPIRED:
1936                         if (calldata->arg.fmode == 0)
1937                                 break;
1938                 default:
1939                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1940                                 rpc_restart_call_prepare(task);
1941         }
1942         nfs_release_seqid(calldata->arg.seqid);
1943         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1944 }
1945
1946 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1947 {
1948         struct nfs4_closedata *calldata = data;
1949         struct nfs4_state *state = calldata->state;
1950         int call_close = 0;
1951
1952         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1953                 return;
1954
1955         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1956         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1957         spin_lock(&state->owner->so_lock);
1958         /* Calculate the change in open mode */
1959         if (state->n_rdwr == 0) {
1960                 if (state->n_rdonly == 0) {
1961                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1962                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1963                         calldata->arg.fmode &= ~FMODE_READ;
1964                 }
1965                 if (state->n_wronly == 0) {
1966                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1967                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1968                         calldata->arg.fmode &= ~FMODE_WRITE;
1969                 }
1970         }
1971         spin_unlock(&state->owner->so_lock);
1972
1973         if (!call_close) {
1974                 /* Note: exit _without_ calling nfs4_close_done */
1975                 task->tk_action = NULL;
1976                 return;
1977         }
1978
1979         if (calldata->arg.fmode == 0) {
1980                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1981                 if (calldata->roc &&
1982                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1983                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1984                                      task, NULL);
1985                         return;
1986                 }
1987         }
1988
1989         nfs_fattr_init(calldata->res.fattr);
1990         calldata->timestamp = jiffies;
1991         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1992                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1993                                 1, task))
1994                 return;
1995         rpc_call_start(task);
1996 }
1997
1998 static const struct rpc_call_ops nfs4_close_ops = {
1999         .rpc_call_prepare = nfs4_close_prepare,
2000         .rpc_call_done = nfs4_close_done,
2001         .rpc_release = nfs4_free_closedata,
2002 };
2003
2004 /*
2005  * It is possible for data to be read/written from a mem-mapped file
2006  * after the sys_close call (which hits the vfs layer as a flush).
2007  * This means that we can't safely call nfsv4 close on a file until
2008  * the inode is cleared. This in turn means that we are not good
2009  * NFSv4 citizens - we do not indicate to the server to update the file's
2010  * share state even when we are done with one of the three share
2011  * stateid's in the inode.
2012  *
2013  * NOTE: Caller must be holding the sp->so_owner semaphore!
2014  */
2015 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2016 {
2017         struct nfs_server *server = NFS_SERVER(state->inode);
2018         struct nfs4_closedata *calldata;
2019         struct nfs4_state_owner *sp = state->owner;
2020         struct rpc_task *task;
2021         struct rpc_message msg = {
2022                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2023                 .rpc_cred = state->owner->so_cred,
2024         };
2025         struct rpc_task_setup task_setup_data = {
2026                 .rpc_client = server->client,
2027                 .rpc_message = &msg,
2028                 .callback_ops = &nfs4_close_ops,
2029                 .workqueue = nfsiod_workqueue,
2030                 .flags = RPC_TASK_ASYNC,
2031         };
2032         int status = -ENOMEM;
2033
2034         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2035         if (calldata == NULL)
2036                 goto out;
2037         calldata->inode = state->inode;
2038         calldata->state = state;
2039         calldata->arg.fh = NFS_FH(state->inode);
2040         calldata->arg.stateid = &state->open_stateid;
2041         /* Serialization for the sequence id */
2042         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2043         if (calldata->arg.seqid == NULL)
2044                 goto out_free_calldata;
2045         calldata->arg.fmode = 0;
2046         calldata->arg.bitmask = server->cache_consistency_bitmask;
2047         calldata->res.fattr = &calldata->fattr;
2048         calldata->res.seqid = calldata->arg.seqid;
2049         calldata->res.server = server;
2050         calldata->roc = roc;
2051         path_get(path);
2052         calldata->path = *path;
2053
2054         msg.rpc_argp = &calldata->arg;
2055         msg.rpc_resp = &calldata->res;
2056         task_setup_data.callback_data = calldata;
2057         task = rpc_run_task(&task_setup_data);
2058         if (IS_ERR(task))
2059                 return PTR_ERR(task);
2060         status = 0;
2061         if (wait)
2062                 status = rpc_wait_for_completion_task(task);
2063         rpc_put_task(task);
2064         return status;
2065 out_free_calldata:
2066         kfree(calldata);
2067 out:
2068         if (roc)
2069                 pnfs_roc_release(state->inode);
2070         nfs4_put_open_state(state);
2071         nfs4_put_state_owner(sp);
2072         return status;
2073 }
2074
2075 static struct inode *
2076 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2077 {
2078         struct nfs4_state *state;
2079
2080         /* Protect against concurrent sillydeletes */
2081         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2082         if (IS_ERR(state))
2083                 return ERR_CAST(state);
2084         ctx->state = state;
2085         return igrab(state->inode);
2086 }
2087
2088 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2089 {
2090         if (ctx->state == NULL)
2091                 return;
2092         if (is_sync)
2093                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2094         else
2095                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2096 }
2097
2098 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2099 {
2100         struct nfs4_server_caps_arg args = {
2101                 .fhandle = fhandle,
2102         };
2103         struct nfs4_server_caps_res res = {};
2104         struct rpc_message msg = {
2105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2106                 .rpc_argp = &args,
2107                 .rpc_resp = &res,
2108         };
2109         int status;
2110
2111         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2112         if (status == 0) {
2113                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2114                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2115                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2116                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2117                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2118                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2119                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2120                         server->caps |= NFS_CAP_ACLS;
2121                 if (res.has_links != 0)
2122                         server->caps |= NFS_CAP_HARDLINKS;
2123                 if (res.has_symlinks != 0)
2124                         server->caps |= NFS_CAP_SYMLINKS;
2125                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2126                         server->caps |= NFS_CAP_FILEID;
2127                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2128                         server->caps |= NFS_CAP_MODE;
2129                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2130                         server->caps |= NFS_CAP_NLINK;
2131                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2132                         server->caps |= NFS_CAP_OWNER;
2133                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2134                         server->caps |= NFS_CAP_OWNER_GROUP;
2135                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2136                         server->caps |= NFS_CAP_ATIME;
2137                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2138                         server->caps |= NFS_CAP_CTIME;
2139                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2140                         server->caps |= NFS_CAP_MTIME;
2141
2142                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2143                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2144                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2145                 server->acl_bitmask = res.acl_bitmask;
2146         }
2147
2148         return status;
2149 }
2150
2151 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2152 {
2153         struct nfs4_exception exception = { };
2154         int err;
2155         do {
2156                 err = nfs4_handle_exception(server,
2157                                 _nfs4_server_capabilities(server, fhandle),
2158                                 &exception);
2159         } while (exception.retry);
2160         return err;
2161 }
2162
2163 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2164                 struct nfs_fsinfo *info)
2165 {
2166         struct nfs4_lookup_root_arg args = {
2167                 .bitmask = nfs4_fattr_bitmap,
2168         };
2169         struct nfs4_lookup_res res = {
2170                 .server = server,
2171                 .fattr = info->fattr,
2172                 .fh = fhandle,
2173         };
2174         struct rpc_message msg = {
2175                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2176                 .rpc_argp = &args,
2177                 .rpc_resp = &res,
2178         };
2179
2180         nfs_fattr_init(info->fattr);
2181         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2182 }
2183
2184 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2185                 struct nfs_fsinfo *info)
2186 {
2187         struct nfs4_exception exception = { };
2188         int err;
2189         do {
2190                 err = _nfs4_lookup_root(server, fhandle, info);
2191                 switch (err) {
2192                 case 0:
2193                 case -NFS4ERR_WRONGSEC:
2194                         break;
2195                 default:
2196                         err = nfs4_handle_exception(server, err, &exception);
2197                 }
2198         } while (exception.retry);
2199         return err;
2200 }
2201
2202 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2203                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2204 {
2205         struct rpc_auth *auth;
2206         int ret;
2207
2208         auth = rpcauth_create(flavor, server->client);
2209         if (!auth) {
2210                 ret = -EIO;
2211                 goto out;
2212         }
2213         ret = nfs4_lookup_root(server, fhandle, info);
2214 out:
2215         return ret;
2216 }
2217
2218 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2219                               struct nfs_fsinfo *info)
2220 {
2221         int i, len, status = 0;
2222         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2223
2224         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2225         flav_array[len] = RPC_AUTH_NULL;
2226         len += 1;
2227
2228         for (i = 0; i < len; i++) {
2229                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2230                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2231                         continue;
2232                 break;
2233         }
2234         /*
2235          * -EACCESS could mean that the user doesn't have correct permissions
2236          * to access the mount.  It could also mean that we tried to mount
2237          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2238          * existing mount programs don't handle -EACCES very well so it should
2239          * be mapped to -EPERM instead.
2240          */
2241         if (status == -EACCES)
2242                 status = -EPERM;
2243         return status;
2244 }
2245
2246 /*
2247  * get the file handle for the "/" directory on the server
2248  */
2249 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2250                               struct nfs_fsinfo *info)
2251 {
2252         int status = nfs4_lookup_root(server, fhandle, info);
2253         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2254                 /*
2255                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2256                  * by nfs4_map_errors() as this function exits.
2257                  */
2258                 status = nfs4_find_root_sec(server, fhandle, info);
2259         if (status == 0)
2260                 status = nfs4_server_capabilities(server, fhandle);
2261         if (status == 0)
2262                 status = nfs4_do_fsinfo(server, fhandle, info);
2263         return nfs4_map_errors(status);
2264 }
2265
2266 /*
2267  * Get locations and (maybe) other attributes of a referral.
2268  * Note that we'll actually follow the referral later when
2269  * we detect fsid mismatch in inode revalidation
2270  */
2271 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2272 {
2273         int status = -ENOMEM;
2274         struct page *page = NULL;
2275         struct nfs4_fs_locations *locations = NULL;
2276
2277         page = alloc_page(GFP_KERNEL);
2278         if (page == NULL)
2279                 goto out;
2280         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2281         if (locations == NULL)
2282                 goto out;
2283
2284         status = nfs4_proc_fs_locations(dir, name, locations, page);
2285         if (status != 0)
2286                 goto out;
2287         /* Make sure server returned a different fsid for the referral */
2288         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2289                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2290                 status = -EIO;
2291                 goto out;
2292         }
2293
2294         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2295         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2296         if (!fattr->mode)
2297                 fattr->mode = S_IFDIR;
2298         memset(fhandle, 0, sizeof(struct nfs_fh));
2299 out:
2300         if (page)
2301                 __free_page(page);
2302         kfree(locations);
2303         return status;
2304 }
2305
2306 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2307 {
2308         struct nfs4_getattr_arg args = {
2309                 .fh = fhandle,
2310                 .bitmask = server->attr_bitmask,
2311         };
2312         struct nfs4_getattr_res res = {
2313                 .fattr = fattr,
2314                 .server = server,
2315         };
2316         struct rpc_message msg = {
2317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2318                 .rpc_argp = &args,
2319                 .rpc_resp = &res,
2320         };
2321
2322         nfs_fattr_init(fattr);
2323         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2324 }
2325
2326 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2327 {
2328         struct nfs4_exception exception = { };
2329         int err;
2330         do {
2331                 err = nfs4_handle_exception(server,
2332                                 _nfs4_proc_getattr(server, fhandle, fattr),
2333                                 &exception);
2334         } while (exception.retry);
2335         return err;
2336 }
2337
2338 /*
2339  * The file is not closed if it is opened due to the a request to change
2340  * the size of the file. The open call will not be needed once the
2341  * VFS layer lookup-intents are implemented.
2342  *
2343  * Close is called when the inode is destroyed.
2344  * If we haven't opened the file for O_WRONLY, we
2345  * need to in the size_change case to obtain a stateid.
2346  *
2347  * Got race?
2348  * Because OPEN is always done by name in nfsv4, it is
2349  * possible that we opened a different file by the same
2350  * name.  We can recognize this race condition, but we
2351  * can't do anything about it besides returning an error.
2352  *
2353  * This will be fixed with VFS changes (lookup-intent).
2354  */
2355 static int
2356 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2357                   struct iattr *sattr)
2358 {
2359         struct inode *inode = dentry->d_inode;
2360         struct rpc_cred *cred = NULL;
2361         struct nfs4_state *state = NULL;
2362         int status;
2363
2364         if (pnfs_ld_layoutret_on_setattr(inode))
2365                 pnfs_return_layout(inode);
2366
2367         nfs_fattr_init(fattr);
2368
2369         /* Search for an existing open(O_WRITE) file */
2370         if (sattr->ia_valid & ATTR_FILE) {
2371                 struct nfs_open_context *ctx;
2372
2373                 ctx = nfs_file_open_context(sattr->ia_file);
2374                 if (ctx) {
2375                         cred = ctx->cred;
2376                         state = ctx->state;
2377                 }
2378         }
2379
2380         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2381         if (status == 0)
2382                 nfs_setattr_update_inode(inode, sattr);
2383         return status;
2384 }
2385
2386 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2387                 const struct nfs_fh *dirfh, const struct qstr *name,
2388                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2389 {
2390         int                    status;
2391         struct nfs4_lookup_arg args = {
2392                 .bitmask = server->attr_bitmask,
2393                 .dir_fh = dirfh,
2394                 .name = name,
2395         };
2396         struct nfs4_lookup_res res = {
2397                 .server = server,
2398                 .fattr = fattr,
2399                 .fh = fhandle,
2400         };
2401         struct rpc_message msg = {
2402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2403                 .rpc_argp = &args,
2404                 .rpc_resp = &res,
2405         };
2406
2407         nfs_fattr_init(fattr);
2408
2409         dprintk("NFS call  lookupfh %s\n", name->name);
2410         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2411         dprintk("NFS reply lookupfh: %d\n", status);
2412         return status;
2413 }
2414
2415 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2416                               struct qstr *name, struct nfs_fh *fhandle,
2417                               struct nfs_fattr *fattr)
2418 {
2419         struct nfs4_exception exception = { };
2420         int err;
2421         do {
2422                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2423                 /* FIXME: !!!! */
2424                 if (err == -NFS4ERR_MOVED) {
2425                         err = -EREMOTE;
2426                         break;
2427                 }
2428                 err = nfs4_handle_exception(server, err, &exception);
2429         } while (exception.retry);
2430         return err;
2431 }
2432
2433 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2434                 const struct qstr *name, struct nfs_fh *fhandle,
2435                 struct nfs_fattr *fattr)
2436 {
2437         int status;
2438
2439         dprintk("NFS call  lookup %s\n", name->name);
2440         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2441         if (status == -NFS4ERR_MOVED)
2442                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2443         dprintk("NFS reply lookup: %d\n", status);
2444         return status;
2445 }
2446
2447 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2448 {
2449         memset(fh, 0, sizeof(struct nfs_fh));
2450         fattr->fsid.major = 1;
2451         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2452                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2453         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2454         fattr->nlink = 2;
2455 }
2456
2457 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2458                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2459 {
2460         struct nfs4_exception exception = { };
2461         int err;
2462         do {
2463                 err = nfs4_handle_exception(NFS_SERVER(dir),
2464                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2465                                 &exception);
2466                 if (err == -EPERM)
2467                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2468         } while (exception.retry);
2469         return err;
2470 }
2471
2472 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2473 {
2474         struct nfs_server *server = NFS_SERVER(inode);
2475         struct nfs4_accessargs args = {
2476                 .fh = NFS_FH(inode),
2477                 .bitmask = server->attr_bitmask,
2478         };
2479         struct nfs4_accessres res = {
2480                 .server = server,
2481         };
2482         struct rpc_message msg = {
2483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2484                 .rpc_argp = &args,
2485                 .rpc_resp = &res,
2486                 .rpc_cred = entry->cred,
2487         };
2488         int mode = entry->mask;
2489         int status;
2490
2491         /*
2492          * Determine which access bits we want to ask for...
2493          */
2494         if (mode & MAY_READ)
2495                 args.access |= NFS4_ACCESS_READ;
2496         if (S_ISDIR(inode->i_mode)) {
2497                 if (mode & MAY_WRITE)
2498                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2499                 if (mode & MAY_EXEC)
2500                         args.access |= NFS4_ACCESS_LOOKUP;
2501         } else {
2502                 if (mode & MAY_WRITE)
2503                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2504                 if (mode & MAY_EXEC)
2505                         args.access |= NFS4_ACCESS_EXECUTE;
2506         }
2507
2508         res.fattr = nfs_alloc_fattr();
2509         if (res.fattr == NULL)
2510                 return -ENOMEM;
2511
2512         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2513         if (!status) {
2514                 entry->mask = 0;
2515                 if (res.access & NFS4_ACCESS_READ)
2516                         entry->mask |= MAY_READ;
2517                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2518                         entry->mask |= MAY_WRITE;
2519                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2520                         entry->mask |= MAY_EXEC;
2521                 nfs_refresh_inode(inode, res.fattr);
2522         }
2523         nfs_free_fattr(res.fattr);
2524         return status;
2525 }
2526
2527 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2528 {
2529         struct nfs4_exception exception = { };
2530         int err;
2531         do {
2532                 err = nfs4_handle_exception(NFS_SERVER(inode),
2533                                 _nfs4_proc_access(inode, entry),
2534                                 &exception);
2535         } while (exception.retry);
2536         return err;
2537 }
2538
2539 /*
2540  * TODO: For the time being, we don't try to get any attributes
2541  * along with any of the zero-copy operations READ, READDIR,
2542  * READLINK, WRITE.
2543  *
2544  * In the case of the first three, we want to put the GETATTR
2545  * after the read-type operation -- this is because it is hard
2546  * to predict the length of a GETATTR response in v4, and thus
2547  * align the READ data correctly.  This means that the GETATTR
2548  * may end up partially falling into the page cache, and we should
2549  * shift it into the 'tail' of the xdr_buf before processing.
2550  * To do this efficiently, we need to know the total length
2551  * of data received, which doesn't seem to be available outside
2552  * of the RPC layer.
2553  *
2554  * In the case of WRITE, we also want to put the GETATTR after
2555  * the operation -- in this case because we want to make sure
2556  * we get the post-operation mtime and size.  This means that
2557  * we can't use xdr_encode_pages() as written: we need a variant
2558  * of it which would leave room in the 'tail' iovec.
2559  *
2560  * Both of these changes to the XDR layer would in fact be quite
2561  * minor, but I decided to leave them for a subsequent patch.
2562  */
2563 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2564                 unsigned int pgbase, unsigned int pglen)
2565 {
2566         struct nfs4_readlink args = {
2567                 .fh       = NFS_FH(inode),
2568                 .pgbase   = pgbase,
2569                 .pglen    = pglen,
2570                 .pages    = &page,
2571         };
2572         struct nfs4_readlink_res res;
2573         struct rpc_message msg = {
2574                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2575                 .rpc_argp = &args,
2576                 .rpc_resp = &res,
2577         };
2578
2579         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2580 }
2581
2582 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2583                 unsigned int pgbase, unsigned int pglen)
2584 {
2585         struct nfs4_exception exception = { };
2586         int err;
2587         do {
2588                 err = nfs4_handle_exception(NFS_SERVER(inode),
2589                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2590                                 &exception);
2591         } while (exception.retry);
2592         return err;
2593 }
2594
2595 /*
2596  * Got race?
2597  * We will need to arrange for the VFS layer to provide an atomic open.
2598  * Until then, this create/open method is prone to inefficiency and race
2599  * conditions due to the lookup, create, and open VFS calls from sys_open()
2600  * placed on the wire.
2601  *
2602  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2603  * The file will be opened again in the subsequent VFS open call
2604  * (nfs4_proc_file_open).
2605  *
2606  * The open for read will just hang around to be used by any process that
2607  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2608  */
2609
2610 static int
2611 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2612                  int flags, struct nfs_open_context *ctx)
2613 {
2614         struct path my_path = {
2615                 .dentry = dentry,
2616         };
2617         struct path *path = &my_path;
2618         struct nfs4_state *state;
2619         struct rpc_cred *cred = NULL;
2620         fmode_t fmode = 0;
2621         int status = 0;
2622
2623         if (ctx != NULL) {
2624                 cred = ctx->cred;
2625                 path = &ctx->path;
2626                 fmode = ctx->mode;
2627         }
2628         sattr->ia_mode &= ~current_umask();
2629         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2630         d_drop(dentry);
2631         if (IS_ERR(state)) {
2632                 status = PTR_ERR(state);
2633                 goto out;
2634         }
2635         d_add(dentry, igrab(state->inode));
2636         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2637         if (ctx != NULL)
2638                 ctx->state = state;
2639         else
2640                 nfs4_close_sync(path, state, fmode);
2641 out:
2642         return status;
2643 }
2644
2645 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2646 {
2647         struct nfs_server *server = NFS_SERVER(dir);
2648         struct nfs_removeargs args = {
2649                 .fh = NFS_FH(dir),
2650                 .name.len = name->len,
2651                 .name.name = name->name,
2652                 .bitmask = server->attr_bitmask,
2653         };
2654         struct nfs_removeres res = {
2655                 .server = server,
2656         };
2657         struct rpc_message msg = {
2658                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2659                 .rpc_argp = &args,
2660                 .rpc_resp = &res,
2661         };
2662         int status = -ENOMEM;
2663
2664         res.dir_attr = nfs_alloc_fattr();
2665         if (res.dir_attr == NULL)
2666                 goto out;
2667
2668         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2669         if (status == 0) {
2670                 update_changeattr(dir, &res.cinfo);
2671                 nfs_post_op_update_inode(dir, res.dir_attr);
2672         }
2673         nfs_free_fattr(res.dir_attr);
2674 out:
2675         return status;
2676 }
2677
2678 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2679 {
2680         struct nfs4_exception exception = { };
2681         int err;
2682         do {
2683                 err = nfs4_handle_exception(NFS_SERVER(dir),
2684                                 _nfs4_proc_remove(dir, name),
2685                                 &exception);
2686         } while (exception.retry);
2687         return err;
2688 }
2689
2690 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2691 {
2692         struct nfs_server *server = NFS_SERVER(dir);
2693         struct nfs_removeargs *args = msg->rpc_argp;
2694         struct nfs_removeres *res = msg->rpc_resp;
2695
2696         args->bitmask = server->cache_consistency_bitmask;
2697         res->server = server;
2698         res->seq_res.sr_slot = NULL;
2699         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2700 }
2701
2702 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2703 {
2704         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2705
2706         if (!nfs4_sequence_done(task, &res->seq_res))
2707                 return 0;
2708         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2709                 return 0;
2710         update_changeattr(dir, &res->cinfo);
2711         nfs_post_op_update_inode(dir, res->dir_attr);
2712         return 1;
2713 }
2714
2715 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2716 {
2717         struct nfs_server *server = NFS_SERVER(dir);
2718         struct nfs_renameargs *arg = msg->rpc_argp;
2719         struct nfs_renameres *res = msg->rpc_resp;
2720
2721         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2722         arg->bitmask = server->attr_bitmask;
2723         res->server = server;
2724 }
2725
2726 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2727                                  struct inode *new_dir)
2728 {
2729         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2730
2731         if (!nfs4_sequence_done(task, &res->seq_res))
2732                 return 0;
2733         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2734                 return 0;
2735
2736         update_changeattr(old_dir, &res->old_cinfo);
2737         nfs_post_op_update_inode(old_dir, res->old_fattr);
2738         update_changeattr(new_dir, &res->new_cinfo);
2739         nfs_post_op_update_inode(new_dir, res->new_fattr);
2740         return 1;
2741 }
2742
2743 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2744                 struct inode *new_dir, struct qstr *new_name)
2745 {
2746         struct nfs_server *server = NFS_SERVER(old_dir);
2747         struct nfs_renameargs arg = {
2748                 .old_dir = NFS_FH(old_dir),
2749                 .new_dir = NFS_FH(new_dir),
2750                 .old_name = old_name,
2751                 .new_name = new_name,
2752                 .bitmask = server->attr_bitmask,
2753         };
2754         struct nfs_renameres res = {
2755                 .server = server,
2756         };
2757         struct rpc_message msg = {
2758                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2759                 .rpc_argp = &arg,
2760                 .rpc_resp = &res,
2761         };
2762         int status = -ENOMEM;
2763
2764         res.old_fattr = nfs_alloc_fattr();
2765         res.new_fattr = nfs_alloc_fattr();
2766         if (res.old_fattr == NULL || res.new_fattr == NULL)
2767                 goto out;
2768
2769         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2770         if (!status) {
2771                 update_changeattr(old_dir, &res.old_cinfo);
2772                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2773                 update_changeattr(new_dir, &res.new_cinfo);
2774                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2775         }
2776 out:
2777         nfs_free_fattr(res.new_fattr);
2778         nfs_free_fattr(res.old_fattr);
2779         return status;
2780 }
2781
2782 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2783                 struct inode *new_dir, struct qstr *new_name)
2784 {
2785         struct nfs4_exception exception = { };
2786         int err;
2787         do {
2788                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2789                                 _nfs4_proc_rename(old_dir, old_name,
2790                                         new_dir, new_name),
2791                                 &exception);
2792         } while (exception.retry);
2793         return err;
2794 }
2795
2796 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2797 {
2798         struct nfs_server *server = NFS_SERVER(inode);
2799         struct nfs4_link_arg arg = {
2800                 .fh     = NFS_FH(inode),
2801                 .dir_fh = NFS_FH(dir),
2802                 .name   = name,
2803                 .bitmask = server->attr_bitmask,
2804         };
2805         struct nfs4_link_res res = {
2806                 .server = server,
2807         };
2808         struct rpc_message msg = {
2809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2810                 .rpc_argp = &arg,
2811                 .rpc_resp = &res,
2812         };
2813         int status = -ENOMEM;
2814
2815         res.fattr = nfs_alloc_fattr();
2816         res.dir_attr = nfs_alloc_fattr();
2817         if (res.fattr == NULL || res.dir_attr == NULL)
2818                 goto out;
2819
2820         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2821         if (!status) {
2822                 update_changeattr(dir, &res.cinfo);
2823                 nfs_post_op_update_inode(dir, res.dir_attr);
2824                 nfs_post_op_update_inode(inode, res.fattr);
2825         }
2826 out:
2827         nfs_free_fattr(res.dir_attr);
2828         nfs_free_fattr(res.fattr);
2829         return status;
2830 }
2831
2832 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2833 {
2834         struct nfs4_exception exception = { };
2835         int err;
2836         do {
2837                 err = nfs4_handle_exception(NFS_SERVER(inode),
2838                                 _nfs4_proc_link(inode, dir, name),
2839                                 &exception);
2840         } while (exception.retry);
2841         return err;
2842 }
2843
2844 struct nfs4_createdata {
2845         struct rpc_message msg;
2846         struct nfs4_create_arg arg;
2847         struct nfs4_create_res res;
2848         struct nfs_fh fh;
2849         struct nfs_fattr fattr;
2850         struct nfs_fattr dir_fattr;
2851 };
2852
2853 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2854                 struct qstr *name, struct iattr *sattr, u32 ftype)
2855 {
2856         struct nfs4_createdata *data;
2857
2858         data = kzalloc(sizeof(*data), GFP_KERNEL);
2859         if (data != NULL) {
2860                 struct nfs_server *server = NFS_SERVER(dir);
2861
2862                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2863                 data->msg.rpc_argp = &data->arg;
2864                 data->msg.rpc_resp = &data->res;
2865                 data->arg.dir_fh = NFS_FH(dir);
2866                 data->arg.server = server;
2867                 data->arg.name = name;
2868                 data->arg.attrs = sattr;
2869                 data->arg.ftype = ftype;
2870                 data->arg.bitmask = server->attr_bitmask;
2871                 data->res.server = server;
2872                 data->res.fh = &data->fh;
2873                 data->res.fattr = &data->fattr;
2874                 data->res.dir_fattr = &data->dir_fattr;
2875                 nfs_fattr_init(data->res.fattr);
2876                 nfs_fattr_init(data->res.dir_fattr);
2877         }
2878         return data;
2879 }
2880
2881 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2882 {
2883         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2884                                     &data->arg.seq_args, &data->res.seq_res, 1);
2885         if (status == 0) {
2886                 update_changeattr(dir, &data->res.dir_cinfo);
2887                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2888                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2889         }
2890         return status;
2891 }
2892
2893 static void nfs4_free_createdata(struct nfs4_createdata *data)
2894 {
2895         kfree(data);
2896 }
2897
2898 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2899                 struct page *page, unsigned int len, struct iattr *sattr)
2900 {
2901         struct nfs4_createdata *data;
2902         int status = -ENAMETOOLONG;
2903
2904         if (len > NFS4_MAXPATHLEN)
2905                 goto out;
2906
2907         status = -ENOMEM;
2908         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2909         if (data == NULL)
2910                 goto out;
2911
2912         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2913         data->arg.u.symlink.pages = &page;
2914         data->arg.u.symlink.len = len;
2915
2916         status = nfs4_do_create(dir, dentry, data);
2917
2918         nfs4_free_createdata(data);
2919 out:
2920         return status;
2921 }
2922
2923 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2924                 struct page *page, unsigned int len, struct iattr *sattr)
2925 {
2926         struct nfs4_exception exception = { };
2927         int err;
2928         do {
2929                 err = nfs4_handle_exception(NFS_SERVER(dir),
2930                                 _nfs4_proc_symlink(dir, dentry, page,
2931                                                         len, sattr),
2932                                 &exception);
2933         } while (exception.retry);
2934         return err;
2935 }
2936
2937 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2938                 struct iattr *sattr)
2939 {
2940         struct nfs4_createdata *data;
2941         int status = -ENOMEM;
2942
2943         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2944         if (data == NULL)
2945                 goto out;
2946
2947         status = nfs4_do_create(dir, dentry, data);
2948
2949         nfs4_free_createdata(data);
2950 out:
2951         return status;
2952 }
2953
2954 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2955                 struct iattr *sattr)
2956 {
2957         struct nfs4_exception exception = { };
2958         int err;
2959
2960         sattr->ia_mode &= ~current_umask();
2961         do {
2962                 err = nfs4_handle_exception(NFS_SERVER(dir),
2963                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2964                                 &exception);
2965         } while (exception.retry);
2966         return err;
2967 }
2968
2969 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2970                 u64 cookie, struct page **pages, unsigned int count, int plus)
2971 {
2972         struct inode            *dir = dentry->d_inode;
2973         struct nfs4_readdir_arg args = {
2974                 .fh = NFS_FH(dir),
2975                 .pages = pages,
2976                 .pgbase = 0,
2977                 .count = count,
2978                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2979                 .plus = plus,
2980         };
2981         struct nfs4_readdir_res res;
2982         struct rpc_message msg = {
2983                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2984                 .rpc_argp = &args,
2985                 .rpc_resp = &res,
2986                 .rpc_cred = cred,
2987         };
2988         int                     status;
2989
2990         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2991                         dentry->d_parent->d_name.name,
2992                         dentry->d_name.name,
2993                         (unsigned long long)cookie);
2994         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2995         res.pgbase = args.pgbase;
2996         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
2997         if (status >= 0) {
2998                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2999                 status += args.pgbase;
3000         }
3001
3002         nfs_invalidate_atime(dir);
3003
3004         dprintk("%s: returns %d\n", __func__, status);
3005         return status;
3006 }
3007
3008 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3009                 u64 cookie, struct page **pages, unsigned int count, int plus)
3010 {
3011         struct nfs4_exception exception = { };
3012         int err;
3013         do {
3014                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3015                                 _nfs4_proc_readdir(dentry, cred, cookie,
3016                                         pages, count, plus),
3017                                 &exception);
3018         } while (exception.retry);
3019         return err;
3020 }
3021
3022 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3023                 struct iattr *sattr, dev_t rdev)
3024 {
3025         struct nfs4_createdata *data;
3026         int mode = sattr->ia_mode;
3027         int status = -ENOMEM;
3028
3029         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3030         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3031
3032         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3033         if (data == NULL)
3034                 goto out;
3035
3036         if (S_ISFIFO(mode))
3037                 data->arg.ftype = NF4FIFO;
3038         else if (S_ISBLK(mode)) {
3039                 data->arg.ftype = NF4BLK;
3040                 data->arg.u.device.specdata1 = MAJOR(rdev);
3041                 data->arg.u.device.specdata2 = MINOR(rdev);
3042         }
3043         else if (S_ISCHR(mode)) {
3044                 data->arg.ftype = NF4CHR;
3045                 data->arg.u.device.specdata1 = MAJOR(rdev);
3046                 data->arg.u.device.specdata2 = MINOR(rdev);
3047         }
3048
3049         status = nfs4_do_create(dir, dentry, data);
3050
3051         nfs4_free_createdata(data);
3052 out:
3053         return status;
3054 }
3055
3056 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3057                 struct iattr *sattr, dev_t rdev)
3058 {
3059         struct nfs4_exception exception = { };
3060         int err;
3061
3062         sattr->ia_mode &= ~current_umask();
3063         do {
3064                 err = nfs4_handle_exception(NFS_SERVER(dir),
3065                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3066                                 &exception);
3067         } while (exception.retry);
3068         return err;
3069 }
3070
3071 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3072                  struct nfs_fsstat *fsstat)
3073 {
3074         struct nfs4_statfs_arg args = {
3075                 .fh = fhandle,
3076                 .bitmask = server->attr_bitmask,
3077         };
3078         struct nfs4_statfs_res res = {
3079                 .fsstat = fsstat,
3080         };
3081         struct rpc_message msg = {
3082                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3083                 .rpc_argp = &args,
3084                 .rpc_resp = &res,
3085         };
3086
3087         nfs_fattr_init(fsstat->fattr);
3088         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3089 }
3090
3091 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3092 {
3093         struct nfs4_exception exception = { };
3094         int err;
3095         do {
3096                 err = nfs4_handle_exception(server,
3097                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3098                                 &exception);
3099         } while (exception.retry);
3100         return err;
3101 }
3102
3103 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3104                 struct nfs_fsinfo *fsinfo)
3105 {
3106         struct nfs4_fsinfo_arg args = {
3107                 .fh = fhandle,
3108                 .bitmask = server->attr_bitmask,
3109         };
3110         struct nfs4_fsinfo_res res = {
3111                 .fsinfo = fsinfo,
3112         };
3113         struct rpc_message msg = {
3114                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3115                 .rpc_argp = &args,
3116                 .rpc_resp = &res,
3117         };
3118
3119         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3120 }
3121
3122 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3123 {
3124         struct nfs4_exception exception = { };
3125         int err;
3126
3127         do {
3128                 err = nfs4_handle_exception(server,
3129                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3130                                 &exception);
3131         } while (exception.retry);
3132         return err;
3133 }
3134
3135 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3136 {
3137         nfs_fattr_init(fsinfo->fattr);
3138         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3139 }
3140
3141 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3142                 struct nfs_pathconf *pathconf)
3143 {
3144         struct nfs4_pathconf_arg args = {
3145                 .fh = fhandle,
3146                 .bitmask = server->attr_bitmask,
3147         };
3148         struct nfs4_pathconf_res res = {
3149                 .pathconf = pathconf,
3150         };
3151         struct rpc_message msg = {
3152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3153                 .rpc_argp = &args,
3154                 .rpc_resp = &res,
3155         };
3156
3157         /* None of the pathconf attributes are mandatory to implement */
3158         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3159                 memset(pathconf, 0, sizeof(*pathconf));
3160                 return 0;
3161         }
3162
3163         nfs_fattr_init(pathconf->fattr);
3164         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3165 }
3166
3167 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3168                 struct nfs_pathconf *pathconf)
3169 {
3170         struct nfs4_exception exception = { };
3171         int err;
3172
3173         do {
3174                 err = nfs4_handle_exception(server,
3175                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3176                                 &exception);
3177         } while (exception.retry);
3178         return err;
3179 }
3180
3181 void __nfs4_read_done_cb(struct nfs_read_data *data)
3182 {
3183         nfs_invalidate_atime(data->inode);
3184 }
3185
3186 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3187 {
3188         struct nfs_server *server = NFS_SERVER(data->inode);
3189
3190         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3191                 nfs_restart_rpc(task, server->nfs_client);
3192                 return -EAGAIN;
3193         }
3194
3195         __nfs4_read_done_cb(data);
3196         if (task->tk_status > 0)
3197                 renew_lease(server, data->timestamp);
3198         return 0;
3199 }
3200
3201 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3202 {
3203
3204         dprintk("--> %s\n", __func__);
3205
3206         if (!nfs4_sequence_done(task, &data->res.seq_res))
3207                 return -EAGAIN;
3208
3209         return data->read_done_cb ? data->read_done_cb(task, data) :
3210                                     nfs4_read_done_cb(task, data);
3211 }
3212
3213 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3214 {
3215         data->timestamp   = jiffies;
3216         data->read_done_cb = nfs4_read_done_cb;
3217         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3218 }
3219
3220 /* Reset the the nfs_read_data to send the read to the MDS. */
3221 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3222 {
3223         dprintk("%s Reset task for i/o through\n", __func__);
3224         put_lseg(data->lseg);
3225         data->lseg = NULL;
3226         /* offsets will differ in the dense stripe case */
3227         data->args.offset = data->mds_offset;
3228         data->ds_clp = NULL;
3229         data->args.fh     = NFS_FH(data->inode);
3230         data->read_done_cb = nfs4_read_done_cb;
3231         task->tk_ops = data->mds_ops;
3232         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3233 }
3234 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3235
3236 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3237 {
3238         struct inode *inode = data->inode;
3239
3240         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3241                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3242                 return -EAGAIN;
3243         }
3244         if (task->tk_status >= 0) {
3245                 renew_lease(NFS_SERVER(inode), data->timestamp);
3246                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3247         }
3248         return 0;
3249 }
3250
3251 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3252 {
3253         if (!nfs4_sequence_done(task, &data->res.seq_res))
3254                 return -EAGAIN;
3255         return data->write_done_cb ? data->write_done_cb(task, data) :
3256                 nfs4_write_done_cb(task, data);
3257 }
3258
3259 /* Reset the the nfs_write_data to send the write to the MDS. */
3260 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3261 {
3262         dprintk("%s Reset task for i/o through\n", __func__);
3263         put_lseg(data->lseg);
3264         data->lseg          = NULL;
3265         data->ds_clp        = NULL;
3266         data->write_done_cb = nfs4_write_done_cb;
3267         data->args.fh       = NFS_FH(data->inode);
3268         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3269         data->args.offset   = data->mds_offset;
3270         data->res.fattr     = &data->fattr;
3271         task->tk_ops        = data->mds_ops;
3272         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3273 }
3274 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3275
3276 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3277 {
3278         struct nfs_server *server = NFS_SERVER(data->inode);
3279
3280         if (data->lseg) {
3281                 data->args.bitmask = NULL;
3282                 data->res.fattr = NULL;
3283         } else
3284                 data->args.bitmask = server->cache_consistency_bitmask;
3285         if (!data->write_done_cb)
3286                 data->write_done_cb = nfs4_write_done_cb;
3287         data->res.server = server;
3288         data->timestamp   = jiffies;
3289
3290         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3291 }
3292
3293 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3294 {
3295         struct inode *inode = data->inode;
3296
3297         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3298                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3299                 return -EAGAIN;
3300         }
3301         nfs_refresh_inode(inode, data->res.fattr);
3302         return 0;
3303 }
3304
3305 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3306 {
3307         if (!nfs4_sequence_done(task, &data->res.seq_res))
3308                 return -EAGAIN;
3309         return data->write_done_cb(task, data);
3310 }
3311
3312 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3313 {
3314         struct nfs_server *server = NFS_SERVER(data->inode);
3315
3316         if (data->lseg) {
3317                 data->args.bitmask = NULL;
3318                 data->res.fattr = NULL;
3319         } else
3320                 data->args.bitmask = server->cache_consistency_bitmask;
3321         if (!data->write_done_cb)
3322                 data->write_done_cb = nfs4_commit_done_cb;
3323         data->res.server = server;
3324         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3325 }
3326
3327 struct nfs4_renewdata {
3328         struct nfs_client       *client;
3329         unsigned long           timestamp;
3330 };
3331
3332 /*
3333  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3334  * standalone procedure for queueing an asynchronous RENEW.
3335  */
3336 static void nfs4_renew_release(void *calldata)
3337 {
3338         struct nfs4_renewdata *data = calldata;
3339         struct nfs_client *clp = data->client;
3340
3341         if (atomic_read(&clp->cl_count) > 1)
3342                 nfs4_schedule_state_renewal(clp);
3343         nfs_put_client(clp);
3344         kfree(data);
3345 }
3346
3347 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3348 {
3349         struct nfs4_renewdata *data = calldata;
3350         struct nfs_client *clp = data->client;
3351         unsigned long timestamp = data->timestamp;
3352
3353         if (task->tk_status < 0) {
3354                 /* Unless we're shutting down, schedule state recovery! */
3355                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3356                         nfs4_schedule_lease_recovery(clp);
3357                 return;
3358         }
3359         do_renew_lease(clp, timestamp);
3360 }
3361
3362 static const struct rpc_call_ops nfs4_renew_ops = {
3363         .rpc_call_done = nfs4_renew_done,
3364         .rpc_release = nfs4_renew_release,
3365 };
3366
3367 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3368 {
3369         struct rpc_message msg = {
3370                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3371                 .rpc_argp       = clp,
3372                 .rpc_cred       = cred,
3373         };
3374         struct nfs4_renewdata *data;
3375
3376         if (!atomic_inc_not_zero(&clp->cl_count))
3377                 return -EIO;
3378         data = kmalloc(sizeof(*data), GFP_KERNEL);
3379         if (data == NULL)
3380                 return -ENOMEM;
3381         data->client = clp;
3382         data->timestamp = jiffies;
3383         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3384                         &nfs4_renew_ops, data);
3385 }
3386
3387 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3388 {
3389         struct rpc_message msg = {
3390                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3391                 .rpc_argp       = clp,
3392                 .rpc_cred       = cred,
3393         };
3394         unsigned long now = jiffies;
3395         int status;
3396
3397         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3398         if (status < 0)
3399                 return status;
3400         do_renew_lease(clp, now);
3401         return 0;
3402 }
3403
3404 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3405 {
3406         return (server->caps & NFS_CAP_ACLS)
3407                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3408                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3409 }
3410
3411 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3412  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3413  * the stack.
3414  */
3415 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3416
3417 static void buf_to_pages(const void *buf, size_t buflen,
3418                 struct page **pages, unsigned int *pgbase)
3419 {
3420         const void *p = buf;
3421
3422         *pgbase = offset_in_page(buf);
3423         p -= *pgbase;
3424         while (p < buf + buflen) {
3425                 *(pages++) = virt_to_page(p);
3426                 p += PAGE_CACHE_SIZE;
3427         }
3428 }
3429
3430 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3431                 struct page **pages, unsigned int *pgbase)
3432 {
3433         struct page *newpage, **spages;
3434         int rc = 0;
3435         size_t len;
3436         spages = pages;
3437
3438         do {
3439                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3440                 newpage = alloc_page(GFP_KERNEL);
3441
3442                 if (newpage == NULL)
3443                         goto unwind;
3444                 memcpy(page_address(newpage), buf, len);
3445                 buf += len;
3446                 buflen -= len;
3447                 *pages++ = newpage;
3448                 rc++;
3449         } while (buflen != 0);
3450
3451         return rc;
3452
3453 unwind:
3454         for(; rc > 0; rc--)
3455                 __free_page(spages[rc-1]);
3456         return -ENOMEM;
3457 }
3458
3459 struct nfs4_cached_acl {
3460         int cached;
3461         size_t len;
3462         char data[0];
3463 };
3464
3465 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3466 {
3467         struct nfs_inode *nfsi = NFS_I(inode);
3468
3469         spin_lock(&inode->i_lock);
3470         kfree(nfsi->nfs4_acl);
3471         nfsi->nfs4_acl = acl;
3472         spin_unlock(&inode->i_lock);
3473 }
3474
3475 static void nfs4_zap_acl_attr(struct inode *inode)
3476 {
3477         nfs4_set_cached_acl(inode, NULL);
3478 }
3479
3480 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3481 {
3482         struct nfs_inode *nfsi = NFS_I(inode);
3483         struct nfs4_cached_acl *acl;
3484         int ret = -ENOENT;
3485
3486         spin_lock(&inode->i_lock);
3487         acl = nfsi->nfs4_acl;
3488         if (acl == NULL)
3489                 goto out;
3490         if (buf == NULL) /* user is just asking for length */
3491                 goto out_len;
3492         if (acl->cached == 0)
3493                 goto out;
3494         ret = -ERANGE; /* see getxattr(2) man page */
3495         if (acl->len > buflen)
3496                 goto out;
3497         memcpy(buf, acl->data, acl->len);
3498 out_len:
3499         ret = acl->len;
3500 out:
3501         spin_unlock(&inode->i_lock);
3502         return ret;
3503 }
3504
3505 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3506 {
3507         struct nfs4_cached_acl *acl;
3508
3509         if (buf && acl_len <= PAGE_SIZE) {
3510                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3511                 if (acl == NULL)
3512                         goto out;
3513                 acl->cached = 1;
3514                 memcpy(acl->data, buf, acl_len);
3515         } else {
3516                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3517                 if (acl == NULL)
3518                         goto out;
3519                 acl->cached = 0;
3520         }
3521         acl->len = acl_len;
3522 out:
3523         nfs4_set_cached_acl(inode, acl);
3524 }
3525
3526 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3527 {
3528         struct page *pages[NFS4ACL_MAXPAGES];
3529         struct nfs_getaclargs args = {
3530                 .fh = NFS_FH(inode),
3531                 .acl_pages = pages,
3532                 .acl_len = buflen,
3533         };
3534         struct nfs_getaclres res = {
3535                 .acl_len = buflen,
3536         };
3537         void *resp_buf;
3538         struct rpc_message msg = {
3539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3540                 .rpc_argp = &args,
3541                 .rpc_resp = &res,
3542         };
3543         struct page *localpage = NULL;
3544         int ret;
3545
3546         if (buflen < PAGE_SIZE) {
3547                 /* As long as we're doing a round trip to the server anyway,
3548                  * let's be prepared for a page of acl data. */
3549                 localpage = alloc_page(GFP_KERNEL);
3550                 resp_buf = page_address(localpage);
3551                 if (localpage == NULL)
3552                         return -ENOMEM;
3553                 args.acl_pages[0] = localpage;
3554                 args.acl_pgbase = 0;
3555                 args.acl_len = PAGE_SIZE;
3556         } else {
3557                 resp_buf = buf;
3558                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3559         }
3560         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3561         if (ret)
3562                 goto out_free;
3563         if (res.acl_len > args.acl_len)
3564                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3565         else
3566                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3567         if (buf) {
3568                 ret = -ERANGE;
3569                 if (res.acl_len > buflen)
3570                         goto out_free;
3571                 if (localpage)
3572                         memcpy(buf, resp_buf, res.acl_len);
3573         }
3574         ret = res.acl_len;
3575 out_free:
3576         if (localpage)
3577                 __free_page(localpage);
3578         return ret;
3579 }
3580
3581 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3582 {
3583         struct nfs4_exception exception = { };
3584         ssize_t ret;
3585         do {
3586                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3587                 if (ret >= 0)
3588                         break;
3589                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3590         } while (exception.retry);
3591         return ret;
3592 }
3593
3594 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3595 {
3596         struct nfs_server *server = NFS_SERVER(inode);
3597         int ret;
3598
3599         if (!nfs4_server_supports_acls(server))
3600                 return -EOPNOTSUPP;
3601         ret = nfs_revalidate_inode(server, inode);
3602         if (ret < 0)
3603                 return ret;
3604         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3605                 nfs_zap_acl_cache(inode);
3606         ret = nfs4_read_cached_acl(inode, buf, buflen);
3607         if (ret != -ENOENT)
3608                 return ret;
3609         return nfs4_get_acl_uncached(inode, buf, buflen);
3610 }
3611
3612 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3613 {
3614         struct nfs_server *server = NFS_SERVER(inode);
3615         struct page *pages[NFS4ACL_MAXPAGES];
3616         struct nfs_setaclargs arg = {
3617                 .fh             = NFS_FH(inode),
3618                 .acl_pages      = pages,
3619                 .acl_len        = buflen,
3620         };
3621         struct nfs_setaclres res;
3622         struct rpc_message msg = {
3623                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3624                 .rpc_argp       = &arg,
3625                 .rpc_resp       = &res,
3626         };
3627         int ret, i;
3628
3629         if (!nfs4_server_supports_acls(server))
3630                 return -EOPNOTSUPP;
3631         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3632         if (i < 0)
3633                 return i;
3634         nfs_inode_return_delegation(inode);
3635         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3636
3637         /*
3638          * Free each page after tx, so the only ref left is
3639          * held by the network stack
3640          */
3641         for (; i > 0; i--)
3642                 put_page(pages[i-1]);
3643
3644         /*
3645          * Acl update can result in inode attribute update.
3646          * so mark the attribute cache invalid.
3647          */
3648         spin_lock(&inode->i_lock);
3649         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3650         spin_unlock(&inode->i_lock);
3651         nfs_access_zap_cache(inode);
3652         nfs_zap_acl_cache(inode);
3653         return ret;
3654 }
3655
3656 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3657 {
3658         struct nfs4_exception exception = { };
3659         int err;
3660         do {
3661                 err = nfs4_handle_exception(NFS_SERVER(inode),
3662                                 __nfs4_proc_set_acl(inode, buf, buflen),
3663                                 &exception);
3664         } while (exception.retry);
3665         return err;
3666 }
3667
3668 static int
3669 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3670 {
3671         struct nfs_client *clp = server->nfs_client;
3672
3673         if (task->tk_status >= 0)
3674                 return 0;
3675         switch(task->tk_status) {
3676                 case -NFS4ERR_ADMIN_REVOKED:
3677                 case -NFS4ERR_BAD_STATEID:
3678                 case -NFS4ERR_OPENMODE:
3679                         if (state == NULL)
3680                                 break;
3681                         nfs4_schedule_stateid_recovery(server, state);
3682                         goto wait_on_recovery;
3683                 case -NFS4ERR_STALE_STATEID:
3684                 case -NFS4ERR_STALE_CLIENTID:
3685                 case -NFS4ERR_EXPIRED:
3686                         nfs4_schedule_lease_recovery(clp);
3687                         goto wait_on_recovery;
3688 #if defined(CONFIG_NFS_V4_1)
3689                 case -NFS4ERR_BADSESSION:
3690                 case -NFS4ERR_BADSLOT:
3691                 case -NFS4ERR_BAD_HIGH_SLOT:
3692                 case -NFS4ERR_DEADSESSION:
3693                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3694                 case -NFS4ERR_SEQ_FALSE_RETRY:
3695                 case -NFS4ERR_SEQ_MISORDERED:
3696                         dprintk("%s ERROR %d, Reset session\n", __func__,
3697                                 task->tk_status);
3698                         nfs4_schedule_session_recovery(clp->cl_session);
3699                         task->tk_status = 0;
3700                         return -EAGAIN;
3701 #endif /* CONFIG_NFS_V4_1 */
3702                 case -NFS4ERR_DELAY:
3703                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3704                 case -NFS4ERR_GRACE:
3705                 case -EKEYEXPIRED:
3706                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3707                         task->tk_status = 0;
3708                         return -EAGAIN;
3709                 case -NFS4ERR_RETRY_UNCACHED_REP:
3710                 case -NFS4ERR_OLD_STATEID:
3711                         task->tk_status = 0;
3712                         return -EAGAIN;
3713         }
3714         task->tk_status = nfs4_map_errors(task->tk_status);
3715         return 0;
3716 wait_on_recovery:
3717         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3718         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3719                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3720         task->tk_status = 0;
3721         return -EAGAIN;
3722 }
3723
3724 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3725                 unsigned short port, struct rpc_cred *cred,
3726                 struct nfs4_setclientid_res *res)
3727 {
3728         nfs4_verifier sc_verifier;
3729         struct nfs4_setclientid setclientid = {
3730                 .sc_verifier = &sc_verifier,
3731                 .sc_prog = program,
3732                 .sc_cb_ident = clp->cl_cb_ident,
3733         };
3734         struct rpc_message msg = {
3735                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3736                 .rpc_argp = &setclientid,
3737                 .rpc_resp = res,
3738                 .rpc_cred = cred,
3739         };
3740         __be32 *p;
3741         int loop = 0;
3742         int status;
3743
3744         p = (__be32*)sc_verifier.data;
3745         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3746         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3747
3748         for(;;) {
3749                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3750                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3751                                 clp->cl_ipaddr,
3752                                 rpc_peeraddr2str(clp->cl_rpcclient,
3753                                                         RPC_DISPLAY_ADDR),
3754                                 rpc_peeraddr2str(clp->cl_rpcclient,
3755                                                         RPC_DISPLAY_PROTO),
3756                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3757                                 clp->cl_id_uniquifier);
3758                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3759                                 sizeof(setclientid.sc_netid),
3760                                 rpc_peeraddr2str(clp->cl_rpcclient,
3761                                                         RPC_DISPLAY_NETID));
3762                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3763                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3764                                 clp->cl_ipaddr, port >> 8, port & 255);
3765
3766                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3767                 if (status != -NFS4ERR_CLID_INUSE)
3768                         break;
3769                 if (loop != 0) {
3770                         ++clp->cl_id_uniquifier;
3771                         break;
3772                 }
3773                 ++loop;
3774                 ssleep(clp->cl_lease_time / HZ + 1);
3775         }
3776         return status;
3777 }
3778
3779 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3780                 struct nfs4_setclientid_res *arg,
3781                 struct rpc_cred *cred)
3782 {
3783         struct nfs_fsinfo fsinfo;
3784         struct rpc_message msg = {
3785                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3786                 .rpc_argp = arg,
3787                 .rpc_resp = &fsinfo,
3788                 .rpc_cred = cred,
3789         };
3790         unsigned long now;
3791         int status;
3792
3793         now = jiffies;
3794         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3795         if (status == 0) {
3796                 spin_lock(&clp->cl_lock);
3797                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3798                 clp->cl_last_renewal = now;
3799                 spin_unlock(&clp->cl_lock);
3800         }
3801         return status;
3802 }
3803
3804 struct nfs4_delegreturndata {
3805         struct nfs4_delegreturnargs args;
3806         struct nfs4_delegreturnres res;
3807         struct nfs_fh fh;
3808         nfs4_stateid stateid;
3809         unsigned long timestamp;
3810         struct nfs_fattr fattr;
3811         int rpc_status;
3812 };
3813
3814 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3815 {
3816         struct nfs4_delegreturndata *data = calldata;
3817
3818         if (!nfs4_sequence_done(task, &data->res.seq_res))
3819                 return;
3820
3821         switch (task->tk_status) {
3822         case -NFS4ERR_STALE_STATEID:
3823         case -NFS4ERR_EXPIRED:
3824         case 0:
3825                 renew_lease(data->res.server, data->timestamp);
3826                 break;
3827         default:
3828                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3829                                 -EAGAIN) {
3830                         nfs_restart_rpc(task, data->res.server->nfs_client);
3831                         return;
3832                 }
3833         }
3834         data->rpc_status = task->tk_status;
3835 }
3836
3837 static void nfs4_delegreturn_release(void *calldata)
3838 {
3839         kfree(calldata);
3840 }
3841
3842 #if defined(CONFIG_NFS_V4_1)
3843 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3844 {
3845         struct nfs4_delegreturndata *d_data;
3846
3847         d_data = (struct nfs4_delegreturndata *)data;
3848
3849         if (nfs4_setup_sequence(d_data->res.server,
3850                                 &d_data->args.seq_args,
3851                                 &d_data->res.seq_res, 1, task))
3852                 return;
3853         rpc_call_start(task);
3854 }
3855 #endif /* CONFIG_NFS_V4_1 */
3856
3857 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3858 #if defined(CONFIG_NFS_V4_1)
3859         .rpc_call_prepare = nfs4_delegreturn_prepare,
3860 #endif /* CONFIG_NFS_V4_1 */
3861         .rpc_call_done = nfs4_delegreturn_done,
3862         .rpc_release = nfs4_delegreturn_release,
3863 };
3864
3865 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3866 {
3867         struct nfs4_delegreturndata *data;
3868         struct nfs_server *server = NFS_SERVER(inode);
3869         struct rpc_task *task;
3870         struct rpc_message msg = {
3871                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3872                 .rpc_cred = cred,
3873         };
3874         struct rpc_task_setup task_setup_data = {
3875                 .rpc_client = server->client,
3876                 .rpc_message = &msg,
3877                 .callback_ops = &nfs4_delegreturn_ops,
3878                 .flags = RPC_TASK_ASYNC,
3879         };
3880         int status = 0;
3881
3882         data = kzalloc(sizeof(*data), GFP_NOFS);
3883         if (data == NULL)
3884                 return -ENOMEM;
3885         data->args.fhandle = &data->fh;
3886         data->args.stateid = &data->stateid;
3887         data->args.bitmask = server->attr_bitmask;
3888         nfs_copy_fh(&data->fh, NFS_FH(inode));
3889         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3890         data->res.fattr = &data->fattr;
3891         data->res.server = server;
3892         nfs_fattr_init(data->res.fattr);
3893         data->timestamp = jiffies;
3894         data->rpc_status = 0;
3895
3896         task_setup_data.callback_data = data;
3897         msg.rpc_argp = &data->args;
3898         msg.rpc_resp = &data->res;
3899         task = rpc_run_task(&task_setup_data);
3900         if (IS_ERR(task))
3901                 return PTR_ERR(task);
3902         if (!issync)
3903                 goto out;
3904         status = nfs4_wait_for_completion_rpc_task(task);
3905         if (status != 0)
3906                 goto out;
3907         status = data->rpc_status;
3908         if (status != 0)
3909                 goto out;
3910         nfs_refresh_inode(inode, &data->fattr);
3911 out:
3912         rpc_put_task(task);
3913         return status;
3914 }
3915
3916 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3917 {
3918         struct nfs_server *server = NFS_SERVER(inode);
3919         struct nfs4_exception exception = { };
3920         int err;
3921         do {
3922                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3923                 switch (err) {
3924                         case -NFS4ERR_STALE_STATEID:
3925                         case -NFS4ERR_EXPIRED:
3926                         case 0:
3927                                 return 0;
3928                 }
3929                 err = nfs4_handle_exception(server, err, &exception);
3930         } while (exception.retry);
3931         return err;
3932 }
3933
3934 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3935 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3936
3937 /*
3938  * sleep, with exponential backoff, and retry the LOCK operation.
3939  */
3940 static unsigned long
3941 nfs4_set_lock_task_retry(unsigned long timeout)
3942 {
3943         schedule_timeout_killable(timeout);
3944         timeout <<= 1;
3945         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3946                 return NFS4_LOCK_MAXTIMEOUT;
3947         return timeout;
3948 }
3949
3950 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3951 {
3952         struct inode *inode = state->inode;
3953         struct nfs_server *server = NFS_SERVER(inode);
3954         struct nfs_client *clp = server->nfs_client;
3955         struct nfs_lockt_args arg = {
3956                 .fh = NFS_FH(inode),
3957                 .fl = request,
3958         };
3959         struct nfs_lockt_res res = {
3960                 .denied = request,
3961         };
3962         struct rpc_message msg = {
3963                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3964                 .rpc_argp       = &arg,
3965                 .rpc_resp       = &res,
3966                 .rpc_cred       = state->owner->so_cred,
3967         };
3968         struct nfs4_lock_state *lsp;
3969         int status;
3970
3971         arg.lock_owner.clientid = clp->cl_clientid;
3972         status = nfs4_set_lock_state(state, request);
3973         if (status != 0)
3974                 goto out;
3975         lsp = request->fl_u.nfs4_fl.owner;
3976         arg.lock_owner.id = lsp->ls_id.id;
3977         arg.lock_owner.s_dev = server->s_dev;
3978         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3979         switch (status) {
3980                 case 0:
3981                         request->fl_type = F_UNLCK;
3982                         break;
3983                 case -NFS4ERR_DENIED:
3984                         status = 0;
3985         }
3986         request->fl_ops->fl_release_private(request);
3987 out:
3988         return status;
3989 }
3990
3991 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3992 {
3993         struct nfs4_exception exception = { };
3994         int err;
3995
3996         do {
3997                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3998                                 _nfs4_proc_getlk(state, cmd, request),
3999                                 &exception);
4000         } while (exception.retry);
4001         return err;
4002 }
4003
4004 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4005 {
4006         int res = 0;
4007         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4008                 case FL_POSIX:
4009                         res = posix_lock_file_wait(file, fl);
4010                         break;
4011                 case FL_FLOCK:
4012                         res = flock_lock_file_wait(file, fl);
4013                         break;
4014                 default:
4015                         BUG();
4016         }
4017         return res;
4018 }
4019
4020 struct nfs4_unlockdata {
4021         struct nfs_locku_args arg;
4022         struct nfs_locku_res res;
4023         struct nfs4_lock_state *lsp;
4024         struct nfs_open_context *ctx;
4025         struct file_lock fl;
4026         const struct nfs_server *server;
4027         unsigned long timestamp;
4028 };
4029
4030 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4031                 struct nfs_open_context *ctx,
4032                 struct nfs4_lock_state *lsp,
4033                 struct nfs_seqid *seqid)
4034 {
4035         struct nfs4_unlockdata *p;
4036         struct inode *inode = lsp->ls_state->inode;
4037
4038         p = kzalloc(sizeof(*p), GFP_NOFS);
4039         if (p == NULL)
4040                 return NULL;
4041         p->arg.fh = NFS_FH(inode);
4042         p->arg.fl = &p->fl;
4043         p->arg.seqid = seqid;
4044         p->res.seqid = seqid;
4045         p->arg.stateid = &lsp->ls_stateid;
4046         p->lsp = lsp;
4047         atomic_inc(&lsp->ls_count);
4048         /* Ensure we don't close file until we're done freeing locks! */
4049         p->ctx = get_nfs_open_context(ctx);
4050         memcpy(&p->fl, fl, sizeof(p->fl));
4051         p->server = NFS_SERVER(inode);
4052         return p;
4053 }
4054
4055 static void nfs4_locku_release_calldata(void *data)
4056 {
4057         struct nfs4_unlockdata *calldata = data;
4058         nfs_free_seqid(calldata->arg.seqid);
4059         nfs4_put_lock_state(calldata->lsp);
4060         put_nfs_open_context(calldata->ctx);
4061         kfree(calldata);
4062 }
4063
4064 static void nfs4_locku_done(struct rpc_task *task, void *data)
4065 {
4066         struct nfs4_unlockdata *calldata = data;
4067
4068         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4069                 return;
4070         switch (task->tk_status) {
4071                 case 0:
4072                         memcpy(calldata->lsp->ls_stateid.data,
4073                                         calldata->res.stateid.data,
4074                                         sizeof(calldata->lsp->ls_stateid.data));
4075                         renew_lease(calldata->server, calldata->timestamp);
4076                         break;
4077                 case -NFS4ERR_BAD_STATEID:
4078                 case -NFS4ERR_OLD_STATEID:
4079                 case -NFS4ERR_STALE_STATEID:
4080                 case -NFS4ERR_EXPIRED:
4081                         break;
4082                 default:
4083                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4084                                 nfs_restart_rpc(task,
4085                                                  calldata->server->nfs_client);
4086         }
4087 }
4088
4089 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4090 {
4091         struct nfs4_unlockdata *calldata = data;
4092
4093         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4094                 return;
4095         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4096                 /* Note: exit _without_ running nfs4_locku_done */
4097                 task->tk_action = NULL;
4098                 return;
4099         }
4100         calldata->timestamp = jiffies;
4101         if (nfs4_setup_sequence(calldata->server,
4102                                 &calldata->arg.seq_args,
4103                                 &calldata->res.seq_res, 1, task))
4104                 return;
4105         rpc_call_start(task);
4106 }
4107
4108 static const struct rpc_call_ops nfs4_locku_ops = {
4109         .rpc_call_prepare = nfs4_locku_prepare,
4110         .rpc_call_done = nfs4_locku_done,
4111         .rpc_release = nfs4_locku_release_calldata,
4112 };
4113
4114 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4115                 struct nfs_open_context *ctx,
4116                 struct nfs4_lock_state *lsp,
4117                 struct nfs_seqid *seqid)
4118 {
4119         struct nfs4_unlockdata *data;
4120         struct rpc_message msg = {
4121                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4122                 .rpc_cred = ctx->cred,
4123         };
4124         struct rpc_task_setup task_setup_data = {
4125                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4126                 .rpc_message = &msg,
4127                 .callback_ops = &nfs4_locku_ops,
4128                 .workqueue = nfsiod_workqueue,
4129                 .flags = RPC_TASK_ASYNC,
4130         };
4131
4132         /* Ensure this is an unlock - when canceling a lock, the
4133          * canceled lock is passed in, and it won't be an unlock.
4134          */
4135         fl->fl_type = F_UNLCK;
4136
4137         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4138         if (data == NULL) {
4139                 nfs_free_seqid(seqid);
4140                 return ERR_PTR(-ENOMEM);
4141         }
4142
4143         msg.rpc_argp = &data->arg;
4144         msg.rpc_resp = &data->res;
4145         task_setup_data.callback_data = data;
4146         return rpc_run_task(&task_setup_data);
4147 }
4148
4149 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4150 {
4151         struct nfs_inode *nfsi = NFS_I(state->inode);
4152         struct nfs_seqid *seqid;
4153         struct nfs4_lock_state *lsp;
4154         struct rpc_task *task;
4155         int status = 0;
4156         unsigned char fl_flags = request->fl_flags;
4157
4158         status = nfs4_set_lock_state(state, request);
4159         /* Unlock _before_ we do the RPC call */
4160         request->fl_flags |= FL_EXISTS;
4161         down_read(&nfsi->rwsem);
4162         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4163                 up_read(&nfsi->rwsem);
4164                 goto out;
4165         }
4166         up_read(&nfsi->rwsem);
4167         if (status != 0)
4168                 goto out;
4169         /* Is this a delegated lock? */
4170         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4171                 goto out;
4172         lsp = request->fl_u.nfs4_fl.owner;
4173         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4174         status = -ENOMEM;
4175         if (seqid == NULL)
4176                 goto out;
4177         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4178         status = PTR_ERR(task);
4179         if (IS_ERR(task))
4180                 goto out;
4181         status = nfs4_wait_for_completion_rpc_task(task);
4182         rpc_put_task(task);
4183 out:
4184         request->fl_flags = fl_flags;
4185         return status;
4186 }
4187
4188 struct nfs4_lockdata {
4189         struct nfs_lock_args arg;
4190         struct nfs_lock_res res;
4191         struct nfs4_lock_state *lsp;
4192         struct nfs_open_context *ctx;
4193         struct file_lock fl;
4194         unsigned long timestamp;
4195         int rpc_status;
4196         int cancelled;
4197         struct nfs_server *server;
4198 };
4199
4200 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4201                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4202                 gfp_t gfp_mask)
4203 {
4204         struct nfs4_lockdata *p;
4205         struct inode *inode = lsp->ls_state->inode;
4206         struct nfs_server *server = NFS_SERVER(inode);
4207
4208         p = kzalloc(sizeof(*p), gfp_mask);
4209         if (p == NULL)
4210                 return NULL;
4211
4212         p->arg.fh = NFS_FH(inode);
4213         p->arg.fl = &p->fl;
4214         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4215         if (p->arg.open_seqid == NULL)
4216                 goto out_free;
4217         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4218         if (p->arg.lock_seqid == NULL)
4219                 goto out_free_seqid;
4220         p->arg.lock_stateid = &lsp->ls_stateid;
4221         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4222         p->arg.lock_owner.id = lsp->ls_id.id;
4223         p->arg.lock_owner.s_dev = server->s_dev;
4224         p->res.lock_seqid = p->arg.lock_seqid;
4225         p->lsp = lsp;
4226         p->server = server;
4227         atomic_inc(&lsp->ls_count);
4228         p->ctx = get_nfs_open_context(ctx);
4229         memcpy(&p->fl, fl, sizeof(p->fl));
4230         return p;
4231 out_free_seqid:
4232         nfs_free_seqid(p->arg.open_seqid);
4233 out_free:
4234         kfree(p);
4235         return NULL;
4236 }
4237
4238 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4239 {
4240         struct nfs4_lockdata *data = calldata;
4241         struct nfs4_state *state = data->lsp->ls_state;
4242
4243         dprintk("%s: begin!\n", __func__);
4244         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4245                 return;
4246         /* Do we need to do an open_to_lock_owner? */
4247         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4248                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4249                         return;
4250                 data->arg.open_stateid = &state->stateid;
4251                 data->arg.new_lock_owner = 1;
4252                 data->res.open_seqid = data->arg.open_seqid;
4253         } else
4254                 data->arg.new_lock_owner = 0;
4255         data->timestamp = jiffies;
4256         if (nfs4_setup_sequence(data->server,
4257                                 &data->arg.seq_args,
4258                                 &data->res.seq_res, 1, task))
4259                 return;
4260         rpc_call_start(task);
4261         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4262 }
4263
4264 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4265 {
4266         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4267         nfs4_lock_prepare(task, calldata);
4268 }
4269
4270 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4271 {
4272         struct nfs4_lockdata *data = calldata;
4273
4274         dprintk("%s: begin!\n", __func__);
4275
4276         if (!nfs4_sequence_done(task, &data->res.seq_res))
4277                 return;
4278
4279         data->rpc_status = task->tk_status;
4280         if (data->arg.new_lock_owner != 0) {
4281                 if (data->rpc_status == 0)
4282                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4283                 else
4284                         goto out;
4285         }
4286         if (data->rpc_status == 0) {
4287                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4288                                         sizeof(data->lsp->ls_stateid.data));
4289                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4290                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4291         }
4292 out:
4293         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4294 }
4295
4296 static void nfs4_lock_release(void *calldata)
4297 {
4298         struct nfs4_lockdata *data = calldata;
4299
4300         dprintk("%s: begin!\n", __func__);
4301         nfs_free_seqid(data->arg.open_seqid);
4302         if (data->cancelled != 0) {
4303                 struct rpc_task *task;
4304                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4305                                 data->arg.lock_seqid);
4306                 if (!IS_ERR(task))
4307                         rpc_put_task_async(task);
4308                 dprintk("%s: cancelling lock!\n", __func__);
4309         } else
4310                 nfs_free_seqid(data->arg.lock_seqid);
4311         nfs4_put_lock_state(data->lsp);
4312         put_nfs_open_context(data->ctx);
4313         kfree(data);
4314         dprintk("%s: done!\n", __func__);
4315 }
4316
4317 static const struct rpc_call_ops nfs4_lock_ops = {
4318         .rpc_call_prepare = nfs4_lock_prepare,
4319         .rpc_call_done = nfs4_lock_done,
4320         .rpc_release = nfs4_lock_release,
4321 };
4322
4323 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4324         .rpc_call_prepare = nfs4_recover_lock_prepare,
4325         .rpc_call_done = nfs4_lock_done,
4326         .rpc_release = nfs4_lock_release,
4327 };
4328
4329 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4330 {
4331         switch (error) {
4332         case -NFS4ERR_ADMIN_REVOKED:
4333         case -NFS4ERR_BAD_STATEID:
4334                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4335                 if (new_lock_owner != 0 ||
4336                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4337                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4338                 break;
4339         case -NFS4ERR_STALE_STATEID:
4340                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4341         case -NFS4ERR_EXPIRED:
4342                 nfs4_schedule_lease_recovery(server->nfs_client);
4343         };
4344 }
4345
4346 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4347 {
4348         struct nfs4_lockdata *data;
4349         struct rpc_task *task;
4350         struct rpc_message msg = {
4351                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4352                 .rpc_cred = state->owner->so_cred,
4353         };
4354         struct rpc_task_setup task_setup_data = {
4355                 .rpc_client = NFS_CLIENT(state->inode),
4356                 .rpc_message = &msg,
4357                 .callback_ops = &nfs4_lock_ops,
4358                 .workqueue = nfsiod_workqueue,
4359                 .flags = RPC_TASK_ASYNC,
4360         };
4361         int ret;
4362
4363         dprintk("%s: begin!\n", __func__);
4364         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4365                         fl->fl_u.nfs4_fl.owner,
4366                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4367         if (data == NULL)
4368                 return -ENOMEM;
4369         if (IS_SETLKW(cmd))
4370                 data->arg.block = 1;
4371         if (recovery_type > NFS_LOCK_NEW) {
4372                 if (recovery_type == NFS_LOCK_RECLAIM)
4373                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4374                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4375         }
4376         msg.rpc_argp = &data->arg;
4377         msg.rpc_resp = &data->res;
4378         task_setup_data.callback_data = data;
4379         task = rpc_run_task(&task_setup_data);
4380         if (IS_ERR(task))
4381                 return PTR_ERR(task);
4382         ret = nfs4_wait_for_completion_rpc_task(task);
4383         if (ret == 0) {
4384                 ret = data->rpc_status;
4385                 if (ret)
4386                         nfs4_handle_setlk_error(data->server, data->lsp,
4387                                         data->arg.new_lock_owner, ret);
4388         } else
4389                 data->cancelled = 1;
4390         rpc_put_task(task);
4391         dprintk("%s: done, ret = %d!\n", __func__, ret);
4392         return ret;
4393 }
4394
4395 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4396 {
4397         struct nfs_server *server = NFS_SERVER(state->inode);
4398         struct nfs4_exception exception = { };
4399         int err;
4400
4401         do {
4402                 /* Cache the lock if possible... */
4403                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4404                         return 0;
4405                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4406                 if (err != -NFS4ERR_DELAY)
4407                         break;
4408                 nfs4_handle_exception(server, err, &exception);
4409         } while (exception.retry);
4410         return err;
4411 }
4412
4413 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4414 {
4415         struct nfs_server *server = NFS_SERVER(state->inode);
4416         struct nfs4_exception exception = { };
4417         int err;
4418
4419         err = nfs4_set_lock_state(state, request);
4420         if (err != 0)
4421                 return err;
4422         do {
4423                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4424                         return 0;
4425                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4426                 switch (err) {
4427                 default:
4428                         goto out;
4429                 case -NFS4ERR_GRACE:
4430                 case -NFS4ERR_DELAY:
4431                         nfs4_handle_exception(server, err, &exception);
4432                         err = 0;
4433                 }
4434         } while (exception.retry);
4435 out:
4436         return err;
4437 }
4438
4439 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4440 {
4441         struct nfs_inode *nfsi = NFS_I(state->inode);
4442         unsigned char fl_flags = request->fl_flags;
4443         int status = -ENOLCK;
4444
4445         if ((fl_flags & FL_POSIX) &&
4446                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4447                 goto out;
4448         /* Is this a delegated open? */
4449         status = nfs4_set_lock_state(state, request);
4450         if (status != 0)
4451                 goto out;
4452         request->fl_flags |= FL_ACCESS;
4453         status = do_vfs_lock(request->fl_file, request);
4454         if (status < 0)
4455                 goto out;
4456         down_read(&nfsi->rwsem);
4457         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4458                 /* Yes: cache locks! */
4459                 /* ...but avoid races with delegation recall... */
4460                 request->fl_flags = fl_flags & ~FL_SLEEP;
4461                 status = do_vfs_lock(request->fl_file, request);
4462                 goto out_unlock;
4463         }
4464         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4465         if (status != 0)
4466                 goto out_unlock;
4467         /* Note: we always want to sleep here! */
4468         request->fl_flags = fl_flags | FL_SLEEP;
4469         if (do_vfs_lock(request->fl_file, request) < 0)
4470                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4471 out_unlock:
4472         up_read(&nfsi->rwsem);
4473 out:
4474         request->fl_flags = fl_flags;
4475         return status;
4476 }
4477
4478 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4479 {
4480         struct nfs4_exception exception = { };
4481         int err;
4482
4483         do {
4484                 err = _nfs4_proc_setlk(state, cmd, request);
4485                 if (err == -NFS4ERR_DENIED)
4486                         err = -EAGAIN;
4487                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4488                                 err, &exception);
4489         } while (exception.retry);
4490         return err;
4491 }
4492
4493 static int
4494 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4495 {
4496         struct nfs_open_context *ctx;
4497         struct nfs4_state *state;
4498         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4499         int status;
4500
4501         /* verify open state */
4502         ctx = nfs_file_open_context(filp);
4503         state = ctx->state;
4504
4505         if (request->fl_start < 0 || request->fl_end < 0)
4506                 return -EINVAL;
4507
4508         if (IS_GETLK(cmd)) {
4509                 if (state != NULL)
4510                         return nfs4_proc_getlk(state, F_GETLK, request);
4511                 return 0;
4512         }
4513
4514         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4515                 return -EINVAL;
4516
4517         if (request->fl_type == F_UNLCK) {
4518                 if (state != NULL)
4519                         return nfs4_proc_unlck(state, cmd, request);
4520                 return 0;
4521         }
4522
4523         if (state == NULL)
4524                 return -ENOLCK;
4525         do {
4526                 status = nfs4_proc_setlk(state, cmd, request);
4527                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4528                         break;
4529                 timeout = nfs4_set_lock_task_retry(timeout);
4530                 status = -ERESTARTSYS;
4531                 if (signalled())
4532                         break;
4533         } while(status < 0);
4534         return status;
4535 }
4536
4537 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4538 {
4539         struct nfs_server *server = NFS_SERVER(state->inode);
4540         struct nfs4_exception exception = { };
4541         int err;
4542
4543         err = nfs4_set_lock_state(state, fl);
4544         if (err != 0)
4545                 goto out;
4546         do {
4547                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4548                 switch (err) {
4549                         default:
4550                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4551                                                 __func__, err);
4552                         case 0:
4553                         case -ESTALE:
4554                                 goto out;
4555                         case -NFS4ERR_EXPIRED:
4556                         case -NFS4ERR_STALE_CLIENTID:
4557                         case -NFS4ERR_STALE_STATEID:
4558                                 nfs4_schedule_lease_recovery(server->nfs_client);
4559                                 goto out;
4560                         case -NFS4ERR_BADSESSION:
4561                         case -NFS4ERR_BADSLOT:
4562                         case -NFS4ERR_BAD_HIGH_SLOT:
4563                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4564                         case -NFS4ERR_DEADSESSION:
4565                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4566                                 goto out;
4567                         case -ERESTARTSYS:
4568                                 /*
4569                                  * The show must go on: exit, but mark the
4570                                  * stateid as needing recovery.
4571                                  */
4572                         case -NFS4ERR_ADMIN_REVOKED:
4573                         case -NFS4ERR_BAD_STATEID:
4574                         case -NFS4ERR_OPENMODE:
4575                                 nfs4_schedule_stateid_recovery(server, state);
4576                                 err = 0;
4577                                 goto out;
4578                         case -EKEYEXPIRED:
4579                                 /*
4580                                  * User RPCSEC_GSS context has expired.
4581                                  * We cannot recover this stateid now, so
4582                                  * skip it and allow recovery thread to
4583                                  * proceed.
4584                                  */
4585                                 err = 0;
4586                                 goto out;
4587                         case -ENOMEM:
4588                         case -NFS4ERR_DENIED:
4589                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4590                                 err = 0;
4591                                 goto out;
4592                         case -NFS4ERR_DELAY:
4593                                 break;
4594                 }
4595                 err = nfs4_handle_exception(server, err, &exception);
4596         } while (exception.retry);
4597 out:
4598         return err;
4599 }
4600
4601 static void nfs4_release_lockowner_release(void *calldata)
4602 {
4603         kfree(calldata);
4604 }
4605
4606 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4607         .rpc_release = nfs4_release_lockowner_release,
4608 };
4609
4610 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4611 {
4612         struct nfs_server *server = lsp->ls_state->owner->so_server;
4613         struct nfs_release_lockowner_args *args;
4614         struct rpc_message msg = {
4615                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4616         };
4617
4618         if (server->nfs_client->cl_mvops->minor_version != 0)
4619                 return;
4620         args = kmalloc(sizeof(*args), GFP_NOFS);
4621         if (!args)
4622                 return;
4623         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4624         args->lock_owner.id = lsp->ls_id.id;
4625         args->lock_owner.s_dev = server->s_dev;
4626         msg.rpc_argp = args;
4627         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4628 }
4629
4630 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4631
4632 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4633                                    const void *buf, size_t buflen,
4634                                    int flags, int type)
4635 {
4636         if (strcmp(key, "") != 0)
4637                 return -EINVAL;
4638
4639         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4640 }
4641
4642 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4643                                    void *buf, size_t buflen, int type)
4644 {
4645         if (strcmp(key, "") != 0)
4646                 return -EINVAL;
4647
4648         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4649 }
4650
4651 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4652                                        size_t list_len, const char *name,
4653                                        size_t name_len, int type)
4654 {
4655         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4656
4657         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4658                 return 0;
4659
4660         if (list && len <= list_len)
4661                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4662         return len;
4663 }
4664
4665 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4666 {
4667         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4668                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4669                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4670                 return;
4671
4672         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4673                 NFS_ATTR_FATTR_NLINK;
4674         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4675         fattr->nlink = 2;
4676 }
4677
4678 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4679                 struct nfs4_fs_locations *fs_locations, struct page *page)
4680 {
4681         struct nfs_server *server = NFS_SERVER(dir);
4682         u32 bitmask[2] = {
4683                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4684                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4685         };
4686         struct nfs4_fs_locations_arg args = {
4687                 .dir_fh = NFS_FH(dir),
4688                 .name = name,
4689                 .page = page,
4690                 .bitmask = bitmask,
4691         };
4692         struct nfs4_fs_locations_res res = {
4693                 .fs_locations = fs_locations,
4694         };
4695         struct rpc_message msg = {
4696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4697                 .rpc_argp = &args,
4698                 .rpc_resp = &res,
4699         };
4700         int status;
4701
4702         dprintk("%s: start\n", __func__);
4703         nfs_fattr_init(&fs_locations->fattr);
4704         fs_locations->server = server;
4705         fs_locations->nlocations = 0;
4706         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4707         nfs_fixup_referral_attributes(&fs_locations->fattr);
4708         dprintk("%s: returned status = %d\n", __func__, status);
4709         return status;
4710 }
4711
4712 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4713 {
4714         int status;
4715         struct nfs4_secinfo_arg args = {
4716                 .dir_fh = NFS_FH(dir),
4717                 .name   = name,
4718         };
4719         struct nfs4_secinfo_res res = {
4720                 .flavors     = flavors,
4721         };
4722         struct rpc_message msg = {
4723                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4724                 .rpc_argp = &args,
4725                 .rpc_resp = &res,
4726         };
4727
4728         dprintk("NFS call  secinfo %s\n", name->name);
4729         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4730         dprintk("NFS reply  secinfo: %d\n", status);
4731         return status;
4732 }
4733
4734 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4735 {
4736         struct nfs4_exception exception = { };
4737         int err;
4738         do {
4739                 err = nfs4_handle_exception(NFS_SERVER(dir),
4740                                 _nfs4_proc_secinfo(dir, name, flavors),
4741                                 &exception);
4742         } while (exception.retry);
4743         return err;
4744 }
4745
4746 #ifdef CONFIG_NFS_V4_1
4747 /*
4748  * Check the exchange flags returned by the server for invalid flags, having
4749  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4750  * DS flags set.
4751  */
4752 static int nfs4_check_cl_exchange_flags(u32 flags)
4753 {
4754         if (flags & ~EXCHGID4_FLAG_MASK_R)
4755                 goto out_inval;
4756         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4757             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4758                 goto out_inval;
4759         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4760                 goto out_inval;
4761         return NFS_OK;
4762 out_inval:
4763         return -NFS4ERR_INVAL;
4764 }
4765
4766 /*
4767  * nfs4_proc_exchange_id()
4768  *
4769  * Since the clientid has expired, all compounds using sessions
4770  * associated with the stale clientid will be returning
4771  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4772  * be in some phase of session reset.
4773  */
4774 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4775 {
4776         nfs4_verifier verifier;
4777         struct nfs41_exchange_id_args args = {
4778                 .client = clp,
4779                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4780         };
4781         struct nfs41_exchange_id_res res = {
4782                 .client = clp,
4783         };
4784         int status;
4785         struct rpc_message msg = {
4786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4787                 .rpc_argp = &args,
4788                 .rpc_resp = &res,
4789                 .rpc_cred = cred,
4790         };
4791         __be32 *p;
4792
4793         dprintk("--> %s\n", __func__);
4794         BUG_ON(clp == NULL);
4795
4796         p = (u32 *)verifier.data;
4797         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4798         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4799         args.verifier = &verifier;
4800
4801         args.id_len = scnprintf(args.id, sizeof(args.id),
4802                                 "%s/%s.%s/%u",
4803                                 clp->cl_ipaddr,
4804                                 init_utsname()->nodename,
4805                                 init_utsname()->domainname,
4806                                 clp->cl_rpcclient->cl_auth->au_flavor);
4807
4808         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4809         if (!status)
4810                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4811         dprintk("<-- %s status= %d\n", __func__, status);
4812         return status;
4813 }
4814
4815 struct nfs4_get_lease_time_data {
4816         struct nfs4_get_lease_time_args *args;
4817         struct nfs4_get_lease_time_res *res;
4818         struct nfs_client *clp;
4819 };
4820
4821 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4822                                         void *calldata)
4823 {
4824         int ret;
4825         struct nfs4_get_lease_time_data *data =
4826                         (struct nfs4_get_lease_time_data *)calldata;
4827
4828         dprintk("--> %s\n", __func__);
4829         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4830         /* just setup sequence, do not trigger session recovery
4831            since we're invoked within one */
4832         ret = nfs41_setup_sequence(data->clp->cl_session,
4833                                    &data->args->la_seq_args,
4834                                    &data->res->lr_seq_res, 0, task);
4835
4836         BUG_ON(ret == -EAGAIN);
4837         rpc_call_start(task);
4838         dprintk("<-- %s\n", __func__);
4839 }
4840
4841 /*
4842  * Called from nfs4_state_manager thread for session setup, so don't recover
4843  * from sequence operation or clientid errors.
4844  */
4845 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4846 {
4847         struct nfs4_get_lease_time_data *data =
4848                         (struct nfs4_get_lease_time_data *)calldata;
4849
4850         dprintk("--> %s\n", __func__);
4851         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4852                 return;
4853         switch (task->tk_status) {
4854         case -NFS4ERR_DELAY:
4855         case -NFS4ERR_GRACE:
4856                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4857                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4858                 task->tk_status = 0;
4859                 /* fall through */
4860         case -NFS4ERR_RETRY_UNCACHED_REP:
4861                 nfs_restart_rpc(task, data->clp);
4862                 return;
4863         }
4864         dprintk("<-- %s\n", __func__);
4865 }
4866
4867 struct rpc_call_ops nfs4_get_lease_time_ops = {
4868         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4869         .rpc_call_done = nfs4_get_lease_time_done,
4870 };
4871
4872 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4873 {
4874         struct rpc_task *task;
4875         struct nfs4_get_lease_time_args args;
4876         struct nfs4_get_lease_time_res res = {
4877                 .lr_fsinfo = fsinfo,
4878         };
4879         struct nfs4_get_lease_time_data data = {
4880                 .args = &args,
4881                 .res = &res,
4882                 .clp = clp,
4883         };
4884         struct rpc_message msg = {
4885                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4886                 .rpc_argp = &args,
4887                 .rpc_resp = &res,
4888         };
4889         struct rpc_task_setup task_setup = {
4890                 .rpc_client = clp->cl_rpcclient,
4891                 .rpc_message = &msg,
4892                 .callback_ops = &nfs4_get_lease_time_ops,
4893                 .callback_data = &data,
4894                 .flags = RPC_TASK_TIMEOUT,
4895         };
4896         int status;
4897
4898         dprintk("--> %s\n", __func__);
4899         task = rpc_run_task(&task_setup);
4900
4901         if (IS_ERR(task))
4902                 status = PTR_ERR(task);
4903         else {
4904                 status = task->tk_status;
4905                 rpc_put_task(task);
4906         }
4907         dprintk("<-- %s return %d\n", __func__, status);
4908
4909         return status;
4910 }
4911
4912 /*
4913  * Reset a slot table
4914  */
4915 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4916                                  int ivalue)
4917 {
4918         struct nfs4_slot *new = NULL;
4919         int i;
4920         int ret = 0;
4921
4922         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4923                 max_reqs, tbl->max_slots);
4924
4925         /* Does the newly negotiated max_reqs match the existing slot table? */
4926         if (max_reqs != tbl->max_slots) {
4927                 ret = -ENOMEM;
4928                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4929                               GFP_NOFS);
4930                 if (!new)
4931                         goto out;
4932                 ret = 0;
4933                 kfree(tbl->slots);
4934         }
4935         spin_lock(&tbl->slot_tbl_lock);
4936         if (new) {
4937                 tbl->slots = new;
4938                 tbl->max_slots = max_reqs;
4939         }
4940         for (i = 0; i < tbl->max_slots; ++i)
4941                 tbl->slots[i].seq_nr = ivalue;
4942         spin_unlock(&tbl->slot_tbl_lock);
4943         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4944                 tbl, tbl->slots, tbl->max_slots);
4945 out:
4946         dprintk("<-- %s: return %d\n", __func__, ret);
4947         return ret;
4948 }
4949
4950 /*
4951  * Reset the forechannel and backchannel slot tables
4952  */
4953 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4954 {
4955         int status;
4956
4957         status = nfs4_reset_slot_table(&session->fc_slot_table,
4958                         session->fc_attrs.max_reqs, 1);
4959         if (status)
4960                 return status;
4961
4962         status = nfs4_reset_slot_table(&session->bc_slot_table,
4963                         session->bc_attrs.max_reqs, 0);
4964         return status;
4965 }
4966
4967 /* Destroy the slot table */
4968 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4969 {
4970         if (session->fc_slot_table.slots != NULL) {
4971                 kfree(session->fc_slot_table.slots);
4972                 session->fc_slot_table.slots = NULL;
4973         }
4974         if (session->bc_slot_table.slots != NULL) {
4975                 kfree(session->bc_slot_table.slots);
4976                 session->bc_slot_table.slots = NULL;
4977         }
4978         return;
4979 }
4980
4981 /*
4982  * Initialize slot table
4983  */
4984 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4985                 int max_slots, int ivalue)
4986 {
4987         struct nfs4_slot *slot;
4988         int ret = -ENOMEM;
4989
4990         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4991
4992         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4993
4994         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4995         if (!slot)
4996                 goto out;
4997         ret = 0;
4998
4999         spin_lock(&tbl->slot_tbl_lock);
5000         tbl->max_slots = max_slots;
5001         tbl->slots = slot;
5002         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5003         spin_unlock(&tbl->slot_tbl_lock);
5004         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5005                 tbl, tbl->slots, tbl->max_slots);
5006 out:
5007         dprintk("<-- %s: return %d\n", __func__, ret);
5008         return ret;
5009 }
5010
5011 /*
5012  * Initialize the forechannel and backchannel tables
5013  */
5014 static int nfs4_init_slot_tables(struct nfs4_session *session)
5015 {
5016         struct nfs4_slot_table *tbl;
5017         int status = 0;
5018
5019         tbl = &session->fc_slot_table;
5020         if (tbl->slots == NULL) {
5021                 status = nfs4_init_slot_table(tbl,
5022                                 session->fc_attrs.max_reqs, 1);
5023                 if (status)
5024                         return status;
5025         }
5026
5027         tbl = &session->bc_slot_table;
5028         if (tbl->slots == NULL) {
5029                 status = nfs4_init_slot_table(tbl,
5030                                 session->bc_attrs.max_reqs, 0);
5031                 if (status)
5032                         nfs4_destroy_slot_tables(session);
5033         }
5034
5035         return status;
5036 }
5037
5038 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5039 {
5040         struct nfs4_session *session;
5041         struct nfs4_slot_table *tbl;
5042
5043         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5044         if (!session)
5045                 return NULL;
5046
5047         tbl = &session->fc_slot_table;
5048         tbl->highest_used_slotid = -1;
5049         spin_lock_init(&tbl->slot_tbl_lock);
5050         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5051         init_completion(&tbl->complete);
5052
5053         tbl = &session->bc_slot_table;
5054         tbl->highest_used_slotid = -1;
5055         spin_lock_init(&tbl->slot_tbl_lock);
5056         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5057         init_completion(&tbl->complete);
5058
5059         session->session_state = 1<<NFS4_SESSION_INITING;
5060
5061         session->clp = clp;
5062         return session;
5063 }
5064
5065 void nfs4_destroy_session(struct nfs4_session *session)
5066 {
5067         nfs4_proc_destroy_session(session);
5068         dprintk("%s Destroy backchannel for xprt %p\n",
5069                 __func__, session->clp->cl_rpcclient->cl_xprt);
5070         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5071                                 NFS41_BC_MIN_CALLBACKS);
5072         nfs4_destroy_slot_tables(session);
5073         kfree(session);
5074 }
5075
5076 /*
5077  * Initialize the values to be used by the client in CREATE_SESSION
5078  * If nfs4_init_session set the fore channel request and response sizes,
5079  * use them.
5080  *
5081  * Set the back channel max_resp_sz_cached to zero to force the client to
5082  * always set csa_cachethis to FALSE because the current implementation
5083  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5084  */
5085 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5086 {
5087         struct nfs4_session *session = args->client->cl_session;
5088         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5089                      mxresp_sz = session->fc_attrs.max_resp_sz;
5090
5091         if (mxrqst_sz == 0)
5092                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5093         if (mxresp_sz == 0)
5094                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5095         /* Fore channel attributes */
5096         args->fc_attrs.headerpadsz = 0;
5097         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5098         args->fc_attrs.max_resp_sz = mxresp_sz;
5099         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5100         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5101
5102         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5103                 "max_ops=%u max_reqs=%u\n",
5104                 __func__,
5105                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5106                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5107
5108         /* Back channel attributes */
5109         args->bc_attrs.headerpadsz = 0;
5110         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5111         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5112         args->bc_attrs.max_resp_sz_cached = 0;
5113         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5114         args->bc_attrs.max_reqs = 1;
5115
5116         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5117                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5118                 __func__,
5119                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5120                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5121                 args->bc_attrs.max_reqs);
5122 }
5123
5124 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5125 {
5126         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5127         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5128
5129         if (rcvd->headerpadsz > sent->headerpadsz)
5130                 return -EINVAL;
5131         if (rcvd->max_resp_sz > sent->max_resp_sz)
5132                 return -EINVAL;
5133         /*
5134          * Our requested max_ops is the minimum we need; we're not
5135          * prepared to break up compounds into smaller pieces than that.
5136          * So, no point even trying to continue if the server won't
5137          * cooperate:
5138          */
5139         if (rcvd->max_ops < sent->max_ops)
5140                 return -EINVAL;
5141         if (rcvd->max_reqs == 0)
5142                 return -EINVAL;
5143         return 0;
5144 }
5145
5146 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5147 {
5148         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5149         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5150
5151         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5152                 return -EINVAL;
5153         if (rcvd->max_resp_sz < sent->max_resp_sz)
5154                 return -EINVAL;
5155         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5156                 return -EINVAL;
5157         /* These would render the backchannel useless: */
5158         if (rcvd->max_ops  == 0)
5159                 return -EINVAL;
5160         if (rcvd->max_reqs == 0)
5161                 return -EINVAL;
5162         return 0;
5163 }
5164
5165 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5166                                      struct nfs4_session *session)
5167 {
5168         int ret;
5169
5170         ret = nfs4_verify_fore_channel_attrs(args, session);
5171         if (ret)
5172                 return ret;
5173         return nfs4_verify_back_channel_attrs(args, session);
5174 }
5175
5176 static int _nfs4_proc_create_session(struct nfs_client *clp)
5177 {
5178         struct nfs4_session *session = clp->cl_session;
5179         struct nfs41_create_session_args args = {
5180                 .client = clp,
5181                 .cb_program = NFS4_CALLBACK,
5182         };
5183         struct nfs41_create_session_res res = {
5184                 .client = clp,
5185         };
5186         struct rpc_message msg = {
5187                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5188                 .rpc_argp = &args,
5189                 .rpc_resp = &res,
5190         };
5191         int status;
5192
5193         nfs4_init_channel_attrs(&args);
5194         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5195
5196         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5197
5198         if (!status)
5199                 /* Verify the session's negotiated channel_attrs values */
5200                 status = nfs4_verify_channel_attrs(&args, session);
5201         if (!status) {
5202                 /* Increment the clientid slot sequence id */
5203                 clp->cl_seqid++;
5204         }
5205
5206         return status;
5207 }
5208
5209 /*
5210  * Issues a CREATE_SESSION operation to the server.
5211  * It is the responsibility of the caller to verify the session is
5212  * expired before calling this routine.
5213  */
5214 int nfs4_proc_create_session(struct nfs_client *clp)
5215 {
5216         int status;
5217         unsigned *ptr;
5218         struct nfs4_session *session = clp->cl_session;
5219
5220         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5221
5222         status = _nfs4_proc_create_session(clp);
5223         if (status)
5224                 goto out;
5225
5226         /* Init and reset the fore channel */
5227         status = nfs4_init_slot_tables(session);
5228         dprintk("slot table initialization returned %d\n", status);
5229         if (status)
5230                 goto out;
5231         status = nfs4_reset_slot_tables(session);
5232         dprintk("slot table reset returned %d\n", status);
5233         if (status)
5234                 goto out;
5235
5236         ptr = (unsigned *)&session->sess_id.data[0];
5237         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5238                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5239 out:
5240         dprintk("<-- %s\n", __func__);
5241         return status;
5242 }
5243
5244 /*
5245  * Issue the over-the-wire RPC DESTROY_SESSION.
5246  * The caller must serialize access to this routine.
5247  */
5248 int nfs4_proc_destroy_session(struct nfs4_session *session)
5249 {
5250         int status = 0;
5251         struct rpc_message msg;
5252
5253         dprintk("--> nfs4_proc_destroy_session\n");
5254
5255         /* session is still being setup */
5256         if (session->clp->cl_cons_state != NFS_CS_READY)
5257                 return status;
5258
5259         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5260         msg.rpc_argp = session;
5261         msg.rpc_resp = NULL;
5262         msg.rpc_cred = NULL;
5263         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5264
5265         if (status)
5266                 printk(KERN_WARNING
5267                         "Got error %d from the server on DESTROY_SESSION. "
5268                         "Session has been destroyed regardless...\n", status);
5269
5270         dprintk("<-- nfs4_proc_destroy_session\n");
5271         return status;
5272 }
5273
5274 int nfs4_init_session(struct nfs_server *server)
5275 {
5276         struct nfs_client *clp = server->nfs_client;
5277         struct nfs4_session *session;
5278         unsigned int rsize, wsize;
5279         int ret;
5280
5281         if (!nfs4_has_session(clp))
5282                 return 0;
5283
5284         session = clp->cl_session;
5285         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5286                 return 0;
5287
5288         rsize = server->rsize;
5289         if (rsize == 0)
5290                 rsize = NFS_MAX_FILE_IO_SIZE;
5291         wsize = server->wsize;
5292         if (wsize == 0)
5293                 wsize = NFS_MAX_FILE_IO_SIZE;
5294
5295         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5296         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5297
5298         ret = nfs4_recover_expired_lease(server);
5299         if (!ret)
5300                 ret = nfs4_check_client_ready(clp);
5301         return ret;
5302 }
5303
5304 int nfs4_init_ds_session(struct nfs_client *clp)
5305 {
5306         struct nfs4_session *session = clp->cl_session;
5307         int ret;
5308
5309         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5310                 return 0;
5311
5312         ret = nfs4_client_recover_expired_lease(clp);
5313         if (!ret)
5314                 /* Test for the DS role */
5315                 if (!is_ds_client(clp))
5316                         ret = -ENODEV;
5317         if (!ret)
5318                 ret = nfs4_check_client_ready(clp);
5319         return ret;
5320
5321 }
5322 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5323
5324
5325 /*
5326  * Renew the cl_session lease.
5327  */
5328 struct nfs4_sequence_data {
5329         struct nfs_client *clp;
5330         struct nfs4_sequence_args args;
5331         struct nfs4_sequence_res res;
5332 };
5333
5334 static void nfs41_sequence_release(void *data)
5335 {
5336         struct nfs4_sequence_data *calldata = data;
5337         struct nfs_client *clp = calldata->clp;
5338
5339         if (atomic_read(&clp->cl_count) > 1)
5340                 nfs4_schedule_state_renewal(clp);
5341         nfs_put_client(clp);
5342         kfree(calldata);
5343 }
5344
5345 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5346 {
5347         switch(task->tk_status) {
5348         case -NFS4ERR_DELAY:
5349                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5350                 return -EAGAIN;
5351         default:
5352                 nfs4_schedule_lease_recovery(clp);
5353         }
5354         return 0;
5355 }
5356
5357 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5358 {
5359         struct nfs4_sequence_data *calldata = data;
5360         struct nfs_client *clp = calldata->clp;
5361
5362         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5363                 return;
5364
5365         if (task->tk_status < 0) {
5366                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5367                 if (atomic_read(&clp->cl_count) == 1)
5368                         goto out;
5369
5370                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5371                         rpc_restart_call_prepare(task);
5372                         return;
5373                 }
5374         }
5375         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5376 out:
5377         dprintk("<-- %s\n", __func__);
5378 }
5379
5380 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5381 {
5382         struct nfs4_sequence_data *calldata = data;
5383         struct nfs_client *clp = calldata->clp;
5384         struct nfs4_sequence_args *args;
5385         struct nfs4_sequence_res *res;
5386
5387         args = task->tk_msg.rpc_argp;
5388         res = task->tk_msg.rpc_resp;
5389
5390         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5391                 return;
5392         rpc_call_start(task);
5393 }
5394
5395 static const struct rpc_call_ops nfs41_sequence_ops = {
5396         .rpc_call_done = nfs41_sequence_call_done,
5397         .rpc_call_prepare = nfs41_sequence_prepare,
5398         .rpc_release = nfs41_sequence_release,
5399 };
5400
5401 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5402 {
5403         struct nfs4_sequence_data *calldata;
5404         struct rpc_message msg = {
5405                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5406                 .rpc_cred = cred,
5407         };
5408         struct rpc_task_setup task_setup_data = {
5409                 .rpc_client = clp->cl_rpcclient,
5410                 .rpc_message = &msg,
5411                 .callback_ops = &nfs41_sequence_ops,
5412                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5413         };
5414
5415         if (!atomic_inc_not_zero(&clp->cl_count))
5416                 return ERR_PTR(-EIO);
5417         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5418         if (calldata == NULL) {
5419                 nfs_put_client(clp);
5420                 return ERR_PTR(-ENOMEM);
5421         }
5422         msg.rpc_argp = &calldata->args;
5423         msg.rpc_resp = &calldata->res;
5424         calldata->clp = clp;
5425         task_setup_data.callback_data = calldata;
5426
5427         return rpc_run_task(&task_setup_data);
5428 }
5429
5430 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5431 {
5432         struct rpc_task *task;
5433         int ret = 0;
5434
5435         task = _nfs41_proc_sequence(clp, cred);
5436         if (IS_ERR(task))
5437                 ret = PTR_ERR(task);
5438         else
5439                 rpc_put_task_async(task);
5440         dprintk("<-- %s status=%d\n", __func__, ret);
5441         return ret;
5442 }
5443
5444 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5445 {
5446         struct rpc_task *task;
5447         int ret;
5448
5449         task = _nfs41_proc_sequence(clp, cred);
5450         if (IS_ERR(task)) {
5451                 ret = PTR_ERR(task);
5452                 goto out;
5453         }
5454         ret = rpc_wait_for_completion_task(task);
5455         if (!ret) {
5456                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5457
5458                 if (task->tk_status == 0)
5459                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5460                 ret = task->tk_status;
5461         }
5462         rpc_put_task(task);
5463 out:
5464         dprintk("<-- %s status=%d\n", __func__, ret);
5465         return ret;
5466 }
5467
5468 struct nfs4_reclaim_complete_data {
5469         struct nfs_client *clp;
5470         struct nfs41_reclaim_complete_args arg;
5471         struct nfs41_reclaim_complete_res res;
5472 };
5473
5474 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5475 {
5476         struct nfs4_reclaim_complete_data *calldata = data;
5477
5478         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5479         if (nfs41_setup_sequence(calldata->clp->cl_session,
5480                                 &calldata->arg.seq_args,
5481                                 &calldata->res.seq_res, 0, task))
5482                 return;
5483
5484         rpc_call_start(task);
5485 }
5486
5487 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5488 {
5489         switch(task->tk_status) {
5490         case 0:
5491         case -NFS4ERR_COMPLETE_ALREADY:
5492         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5493                 break;
5494         case -NFS4ERR_DELAY:
5495                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5496                 /* fall through */
5497         case -NFS4ERR_RETRY_UNCACHED_REP:
5498                 return -EAGAIN;
5499         default:
5500                 nfs4_schedule_lease_recovery(clp);
5501         }
5502         return 0;
5503 }
5504
5505 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5506 {
5507         struct nfs4_reclaim_complete_data *calldata = data;
5508         struct nfs_client *clp = calldata->clp;
5509         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5510
5511         dprintk("--> %s\n", __func__);
5512         if (!nfs41_sequence_done(task, res))
5513                 return;
5514
5515         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5516                 rpc_restart_call_prepare(task);
5517                 return;
5518         }
5519         dprintk("<-- %s\n", __func__);
5520 }
5521
5522 static void nfs4_free_reclaim_complete_data(void *data)
5523 {
5524         struct nfs4_reclaim_complete_data *calldata = data;
5525
5526         kfree(calldata);
5527 }
5528
5529 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5530         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5531         .rpc_call_done = nfs4_reclaim_complete_done,
5532         .rpc_release = nfs4_free_reclaim_complete_data,
5533 };
5534
5535 /*
5536  * Issue a global reclaim complete.
5537  */
5538 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5539 {
5540         struct nfs4_reclaim_complete_data *calldata;
5541         struct rpc_task *task;
5542         struct rpc_message msg = {
5543                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5544         };
5545         struct rpc_task_setup task_setup_data = {
5546                 .rpc_client = clp->cl_rpcclient,
5547                 .rpc_message = &msg,
5548                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5549                 .flags = RPC_TASK_ASYNC,
5550         };
5551         int status = -ENOMEM;
5552
5553         dprintk("--> %s\n", __func__);
5554         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5555         if (calldata == NULL)
5556                 goto out;
5557         calldata->clp = clp;
5558         calldata->arg.one_fs = 0;
5559
5560         msg.rpc_argp = &calldata->arg;
5561         msg.rpc_resp = &calldata->res;
5562         task_setup_data.callback_data = calldata;
5563         task = rpc_run_task(&task_setup_data);
5564         if (IS_ERR(task)) {
5565                 status = PTR_ERR(task);
5566                 goto out;
5567         }
5568         status = nfs4_wait_for_completion_rpc_task(task);
5569         if (status == 0)
5570                 status = task->tk_status;
5571         rpc_put_task(task);
5572         return 0;
5573 out:
5574         dprintk("<-- %s status=%d\n", __func__, status);
5575         return status;
5576 }
5577
5578 static void
5579 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5580 {
5581         struct nfs4_layoutget *lgp = calldata;
5582         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5583
5584         dprintk("--> %s\n", __func__);
5585         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5586          * right now covering the LAYOUTGET we are about to send.
5587          * However, that is not so catastrophic, and there seems
5588          * to be no way to prevent it completely.
5589          */
5590         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5591                                 &lgp->res.seq_res, 0, task))
5592                 return;
5593         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5594                                           NFS_I(lgp->args.inode)->layout,
5595                                           lgp->args.ctx->state)) {
5596                 rpc_exit(task, NFS4_OK);
5597                 return;
5598         }
5599         rpc_call_start(task);
5600 }
5601
5602 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5603 {
5604         struct nfs4_layoutget *lgp = calldata;
5605         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5606
5607         dprintk("--> %s\n", __func__);
5608
5609         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5610                 return;
5611
5612         switch (task->tk_status) {
5613         case 0:
5614                 break;
5615         case -NFS4ERR_LAYOUTTRYLATER:
5616         case -NFS4ERR_RECALLCONFLICT:
5617                 task->tk_status = -NFS4ERR_DELAY;
5618                 /* Fall through */
5619         default:
5620                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5621                         rpc_restart_call_prepare(task);
5622                         return;
5623                 }
5624         }
5625         dprintk("<-- %s\n", __func__);
5626 }
5627
5628 static void nfs4_layoutget_release(void *calldata)
5629 {
5630         struct nfs4_layoutget *lgp = calldata;
5631
5632         dprintk("--> %s\n", __func__);
5633         put_nfs_open_context(lgp->args.ctx);
5634         kfree(calldata);
5635         dprintk("<-- %s\n", __func__);
5636 }
5637
5638 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5639         .rpc_call_prepare = nfs4_layoutget_prepare,
5640         .rpc_call_done = nfs4_layoutget_done,
5641         .rpc_release = nfs4_layoutget_release,
5642 };
5643
5644 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5645 {
5646         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5647         struct rpc_task *task;
5648         struct rpc_message msg = {
5649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5650                 .rpc_argp = &lgp->args,
5651                 .rpc_resp = &lgp->res,
5652         };
5653         struct rpc_task_setup task_setup_data = {
5654                 .rpc_client = server->client,
5655                 .rpc_message = &msg,
5656                 .callback_ops = &nfs4_layoutget_call_ops,
5657                 .callback_data = lgp,
5658                 .flags = RPC_TASK_ASYNC,
5659         };
5660         int status = 0;
5661
5662         dprintk("--> %s\n", __func__);
5663
5664         lgp->res.layoutp = &lgp->args.layout;
5665         lgp->res.seq_res.sr_slot = NULL;
5666         task = rpc_run_task(&task_setup_data);
5667         if (IS_ERR(task))
5668                 return PTR_ERR(task);
5669         status = nfs4_wait_for_completion_rpc_task(task);
5670         if (status == 0)
5671                 status = task->tk_status;
5672         if (status == 0)
5673                 status = pnfs_layout_process(lgp);
5674         rpc_put_task(task);
5675         dprintk("<-- %s status=%d\n", __func__, status);
5676         return status;
5677 }
5678
5679 static void
5680 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5681 {
5682         struct nfs4_layoutreturn *lrp = calldata;
5683
5684         dprintk("--> %s\n", __func__);
5685         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5686                                 &lrp->res.seq_res, 0, task))
5687                 return;
5688         rpc_call_start(task);
5689 }
5690
5691 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5692 {
5693         struct nfs4_layoutreturn *lrp = calldata;
5694         struct nfs_server *server;
5695
5696         dprintk("--> %s\n", __func__);
5697
5698         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5699                 return;
5700
5701         server = NFS_SERVER(lrp->args.inode);
5702         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5703                 nfs_restart_rpc(task, lrp->clp);
5704                 return;
5705         }
5706         if (task->tk_status == 0) {
5707                 struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
5708
5709                 if (lrp->res.lrs_present) {
5710                         spin_lock(&lo->plh_inode->i_lock);
5711                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5712                         spin_unlock(&lo->plh_inode->i_lock);
5713                 } else
5714                         BUG_ON(!list_empty(&lo->plh_segs));
5715         }
5716         dprintk("<-- %s\n", __func__);
5717 }
5718
5719 static void nfs4_layoutreturn_release(void *calldata)
5720 {
5721         struct nfs4_layoutreturn *lrp = calldata;
5722
5723         dprintk("--> %s\n", __func__);
5724         put_layout_hdr(NFS_I(lrp->args.inode)->layout);
5725         kfree(calldata);
5726         dprintk("<-- %s\n", __func__);
5727 }
5728
5729 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5730         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5731         .rpc_call_done = nfs4_layoutreturn_done,
5732         .rpc_release = nfs4_layoutreturn_release,
5733 };
5734
5735 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5736 {
5737         struct rpc_task *task;
5738         struct rpc_message msg = {
5739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5740                 .rpc_argp = &lrp->args,
5741                 .rpc_resp = &lrp->res,
5742         };
5743         struct rpc_task_setup task_setup_data = {
5744                 .rpc_client = lrp->clp->cl_rpcclient,
5745                 .rpc_message = &msg,
5746                 .callback_ops = &nfs4_layoutreturn_call_ops,
5747                 .callback_data = lrp,
5748         };
5749         int status;
5750
5751         dprintk("--> %s\n", __func__);
5752         task = rpc_run_task(&task_setup_data);
5753         if (IS_ERR(task))
5754                 return PTR_ERR(task);
5755         status = task->tk_status;
5756         dprintk("<-- %s status=%d\n", __func__, status);
5757         rpc_put_task(task);
5758         return status;
5759 }
5760
5761 static int
5762 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5763 {
5764         struct nfs4_getdeviceinfo_args args = {
5765                 .pdev = pdev,
5766         };
5767         struct nfs4_getdeviceinfo_res res = {
5768                 .pdev = pdev,
5769         };
5770         struct rpc_message msg = {
5771                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5772                 .rpc_argp = &args,
5773                 .rpc_resp = &res,
5774         };
5775         int status;
5776
5777         dprintk("--> %s\n", __func__);
5778         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5779         dprintk("<-- %s status=%d\n", __func__, status);
5780
5781         return status;
5782 }
5783
5784 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5785 {
5786         struct nfs4_exception exception = { };
5787         int err;
5788
5789         do {
5790                 err = nfs4_handle_exception(server,
5791                                         _nfs4_proc_getdeviceinfo(server, pdev),
5792                                         &exception);
5793         } while (exception.retry);
5794         return err;
5795 }
5796 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5797
5798 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5799 {
5800         struct nfs4_layoutcommit_data *data = calldata;
5801         struct nfs_server *server = NFS_SERVER(data->args.inode);
5802
5803         if (nfs4_setup_sequence(server, &data->args.seq_args,
5804                                 &data->res.seq_res, 1, task))
5805                 return;
5806         rpc_call_start(task);
5807 }
5808
5809 static void
5810 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5811 {
5812         struct nfs4_layoutcommit_data *data = calldata;
5813         struct nfs_server *server = NFS_SERVER(data->args.inode);
5814
5815         if (!nfs4_sequence_done(task, &data->res.seq_res))
5816                 return;
5817
5818         switch (task->tk_status) { /* Just ignore these failures */
5819         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5820         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5821         case NFS4ERR_BADLAYOUT:     /* no layout */
5822         case NFS4ERR_GRACE:         /* loca_recalim always false */
5823                 task->tk_status = 0;
5824         }
5825
5826         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5827                 nfs_restart_rpc(task, server->nfs_client);
5828                 return;
5829         }
5830
5831         if (task->tk_status == 0)
5832                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5833                                                    data->res.fattr);
5834 }
5835
5836 static void nfs4_layoutcommit_release(void *calldata)
5837 {
5838         struct nfs4_layoutcommit_data *data = calldata;
5839
5840         /* Matched by references in pnfs_set_layoutcommit */
5841         put_lseg(data->lseg);
5842         put_rpccred(data->cred);
5843         kfree(data);
5844 }
5845
5846 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5847         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5848         .rpc_call_done = nfs4_layoutcommit_done,
5849         .rpc_release = nfs4_layoutcommit_release,
5850 };
5851
5852 int
5853 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5854 {
5855         struct rpc_message msg = {
5856                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5857                 .rpc_argp = &data->args,
5858                 .rpc_resp = &data->res,
5859                 .rpc_cred = data->cred,
5860         };
5861         struct rpc_task_setup task_setup_data = {
5862                 .task = &data->task,
5863                 .rpc_client = NFS_CLIENT(data->args.inode),
5864                 .rpc_message = &msg,
5865                 .callback_ops = &nfs4_layoutcommit_ops,
5866                 .callback_data = data,
5867                 .flags = RPC_TASK_ASYNC,
5868         };
5869         struct rpc_task *task;
5870         int status = 0;
5871
5872         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5873                 "lbw: %llu inode %lu\n",
5874                 data->task.tk_pid, sync,
5875                 data->args.lastbytewritten,
5876                 data->args.inode->i_ino);
5877
5878         task = rpc_run_task(&task_setup_data);
5879         if (IS_ERR(task))
5880                 return PTR_ERR(task);
5881         if (sync == false)
5882                 goto out;
5883         status = nfs4_wait_for_completion_rpc_task(task);
5884         if (status != 0)
5885                 goto out;
5886         status = task->tk_status;
5887 out:
5888         dprintk("%s: status %d\n", __func__, status);
5889         rpc_put_task(task);
5890         return status;
5891 }
5892 #endif /* CONFIG_NFS_V4_1 */
5893
5894 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5895         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5896         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5897         .recover_open   = nfs4_open_reclaim,
5898         .recover_lock   = nfs4_lock_reclaim,
5899         .establish_clid = nfs4_init_clientid,
5900         .get_clid_cred  = nfs4_get_setclientid_cred,
5901 };
5902
5903 #if defined(CONFIG_NFS_V4_1)
5904 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5905         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5906         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5907         .recover_open   = nfs4_open_reclaim,
5908         .recover_lock   = nfs4_lock_reclaim,
5909         .establish_clid = nfs41_init_clientid,
5910         .get_clid_cred  = nfs4_get_exchange_id_cred,
5911         .reclaim_complete = nfs41_proc_reclaim_complete,
5912 };
5913 #endif /* CONFIG_NFS_V4_1 */
5914
5915 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5916         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5917         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5918         .recover_open   = nfs4_open_expired,
5919         .recover_lock   = nfs4_lock_expired,
5920         .establish_clid = nfs4_init_clientid,
5921         .get_clid_cred  = nfs4_get_setclientid_cred,
5922 };
5923
5924 #if defined(CONFIG_NFS_V4_1)
5925 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5926         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5927         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5928         .recover_open   = nfs4_open_expired,
5929         .recover_lock   = nfs4_lock_expired,
5930         .establish_clid = nfs41_init_clientid,
5931         .get_clid_cred  = nfs4_get_exchange_id_cred,
5932 };
5933 #endif /* CONFIG_NFS_V4_1 */
5934
5935 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5936         .sched_state_renewal = nfs4_proc_async_renew,
5937         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5938         .renew_lease = nfs4_proc_renew,
5939 };
5940
5941 #if defined(CONFIG_NFS_V4_1)
5942 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5943         .sched_state_renewal = nfs41_proc_async_sequence,
5944         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5945         .renew_lease = nfs4_proc_sequence,
5946 };
5947 #endif
5948
5949 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5950         .minor_version = 0,
5951         .call_sync = _nfs4_call_sync,
5952         .validate_stateid = nfs4_validate_delegation_stateid,
5953         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5954         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5955         .state_renewal_ops = &nfs40_state_renewal_ops,
5956 };
5957
5958 #if defined(CONFIG_NFS_V4_1)
5959 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5960         .minor_version = 1,
5961         .call_sync = _nfs4_call_sync_session,
5962         .validate_stateid = nfs41_validate_delegation_stateid,
5963         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5964         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5965         .state_renewal_ops = &nfs41_state_renewal_ops,
5966 };
5967 #endif
5968
5969 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5970         [0] = &nfs_v4_0_minor_ops,
5971 #if defined(CONFIG_NFS_V4_1)
5972         [1] = &nfs_v4_1_minor_ops,
5973 #endif
5974 };
5975
5976 static const struct inode_operations nfs4_file_inode_operations = {
5977         .permission     = nfs_permission,
5978         .getattr        = nfs_getattr,
5979         .setattr        = nfs_setattr,
5980         .getxattr       = generic_getxattr,
5981         .setxattr       = generic_setxattr,
5982         .listxattr      = generic_listxattr,
5983         .removexattr    = generic_removexattr,
5984 };
5985
5986 const struct nfs_rpc_ops nfs_v4_clientops = {
5987         .version        = 4,                    /* protocol version */
5988         .dentry_ops     = &nfs4_dentry_operations,
5989         .dir_inode_ops  = &nfs4_dir_inode_operations,
5990         .file_inode_ops = &nfs4_file_inode_operations,
5991         .getroot        = nfs4_proc_get_root,
5992         .getattr        = nfs4_proc_getattr,
5993         .setattr        = nfs4_proc_setattr,
5994         .lookupfh       = nfs4_proc_lookupfh,
5995         .lookup         = nfs4_proc_lookup,
5996         .access         = nfs4_proc_access,
5997         .readlink       = nfs4_proc_readlink,
5998         .create         = nfs4_proc_create,
5999         .remove         = nfs4_proc_remove,
6000         .unlink_setup   = nfs4_proc_unlink_setup,
6001         .unlink_done    = nfs4_proc_unlink_done,
6002         .rename         = nfs4_proc_rename,
6003         .rename_setup   = nfs4_proc_rename_setup,
6004         .rename_done    = nfs4_proc_rename_done,
6005         .link           = nfs4_proc_link,
6006         .symlink        = nfs4_proc_symlink,
6007         .mkdir          = nfs4_proc_mkdir,
6008         .rmdir          = nfs4_proc_remove,
6009         .readdir        = nfs4_proc_readdir,
6010         .mknod          = nfs4_proc_mknod,
6011         .statfs         = nfs4_proc_statfs,
6012         .fsinfo         = nfs4_proc_fsinfo,
6013         .pathconf       = nfs4_proc_pathconf,
6014         .set_capabilities = nfs4_server_capabilities,
6015         .decode_dirent  = nfs4_decode_dirent,
6016         .read_setup     = nfs4_proc_read_setup,
6017         .read_done      = nfs4_read_done,
6018         .write_setup    = nfs4_proc_write_setup,
6019         .write_done     = nfs4_write_done,
6020         .commit_setup   = nfs4_proc_commit_setup,
6021         .commit_done    = nfs4_commit_done,
6022         .lock           = nfs4_proc_lock,
6023         .clear_acl_cache = nfs4_zap_acl_attr,
6024         .close_context  = nfs4_close_context,
6025         .open_context   = nfs4_atomic_open,
6026         .init_client    = nfs4_init_client,
6027         .secinfo        = nfs4_proc_secinfo,
6028 };
6029
6030 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6031         .prefix = XATTR_NAME_NFSV4_ACL,
6032         .list   = nfs4_xattr_list_nfs4_acl,
6033         .get    = nfs4_xattr_get_nfs4_acl,
6034         .set    = nfs4_xattr_set_nfs4_acl,
6035 };
6036
6037 const struct xattr_handler *nfs4_xattr_handlers[] = {
6038         &nfs4_xattr_nfs4_acl_handler,
6039         NULL
6040 };
6041
6042 /*
6043  * Local variables:
6044  *  c-basic-offset: 8
6045  * End:
6046  */