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_EXPIRED:
 271                         if (state != NULL)
 272                                 nfs4_schedule_stateid_recovery(server, state);
 273                 case -NFS4ERR_STALE_STATEID:
 274                 case -NFS4ERR_STALE_CLIENTID:
 275                         nfs4_schedule_lease_recovery(clp);
 276                         goto wait_on_recovery;
 277 #if defined(CONFIG_NFS_V4_1)
 278                 case -NFS4ERR_BADSESSION:
 279                 case -NFS4ERR_BADSLOT:
 280                 case -NFS4ERR_BAD_HIGH_SLOT:
 281                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 282                 case -NFS4ERR_DEADSESSION:
 283                 case -NFS4ERR_SEQ_FALSE_RETRY:
 284                 case -NFS4ERR_SEQ_MISORDERED:
 285                         dprintk("%s ERROR: %d Reset session\n", __func__,
 286                                 errorcode);
 287                         nfs4_schedule_session_recovery(clp->cl_session);
 288                         exception->retry = 1;
 289                         break;
 290 #endif /* defined(CONFIG_NFS_V4_1) */
 291                 case -NFS4ERR_FILE_OPEN:
 292                         if (exception->timeout > HZ) {
 293                                 /* We have retried a decent amount, time to
 294                                  * fail
 295                                  */
 296                                 ret = -EBUSY;
 297                                 break;
 298                         }
 299                 case -NFS4ERR_GRACE:
 300                 case -NFS4ERR_DELAY:
 301                 case -EKEYEXPIRED:
 302                         ret = nfs4_delay(server->client, &exception->timeout);
 303                         if (ret != 0)
 304                                 break;
 305                 case -NFS4ERR_RETRY_UNCACHED_REP:
 306                 case -NFS4ERR_OLD_STATEID:
 307                         exception->retry = 1;
 308                         break;
 309                 case -NFS4ERR_BADOWNER:
 310                         /* The following works around a Linux server bug! */
 311                 case -NFS4ERR_BADNAME:
 312                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 313                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 314                                 exception->retry = 1;
 315                                 printk(KERN_WARNING "NFS: v4 server %s "
 316                                                 "does not accept raw "
 317                                                 "uid/gids. "
 318                                                 "Reenabling the idmapper.\n",
 319                                                 server->nfs_client->cl_hostname);
 320                         }
 321         }
 322         /* We failed to handle the error */
 323         return nfs4_map_errors(ret);
 324 wait_on_recovery:
 325         ret = nfs4_wait_clnt_recover(clp);
 326         if (ret == 0)
 327                 exception->retry = 1;
 328         return ret;
 329 }
 330
 331
 332 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 333 {
 334         spin_lock(&clp->cl_lock);
 335         if (time_before(clp->cl_last_renewal,timestamp))
 336                 clp->cl_last_renewal = timestamp;
 337         spin_unlock(&clp->cl_lock);
 338 }
 339
 340 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 341 {
 342         do_renew_lease(server->nfs_client, timestamp);
 343 }
 344
 345 #if defined(CONFIG_NFS_V4_1)
 346
 347 /*
 348  * nfs4_free_slot - free a slot and efficiently update slot table.
 349  *
 350  * freeing a slot is trivially done by clearing its respective bit
 351  * in the bitmap.
 352  * If the freed slotid equals highest_used_slotid we want to update it
 353  * so that the server would be able to size down the slot table if needed,
 354  * otherwise we know that the highest_used_slotid is still in use.
 355  * When updating highest_used_slotid there may be "holes" in the bitmap
 356  * so we need to scan down from highest_used_slotid to 0 looking for the now
 357  * highest slotid in use.
 358  * If none found, highest_used_slotid is set to -1.
 359  *
 360  * Must be called while holding tbl->slot_tbl_lock
 361  */
 362 static void
 363 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 364 {
 365         int free_slotid = free_slot - tbl->slots;
 366         int slotid = free_slotid;
 367
 368         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 369         /* clear used bit in bitmap */
 370         __clear_bit(slotid, tbl->used_slots);
 371
 372         /* update highest_used_slotid when it is freed */
 373         if (slotid == tbl->highest_used_slotid) {
 374                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 375                 if (slotid < tbl->max_slots)
 376                         tbl->highest_used_slotid = slotid;
 377                 else
 378                         tbl->highest_used_slotid = -1;
 379         }
 380         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 381                 free_slotid, tbl->highest_used_slotid);
 382 }
 383
 384 /*
 385  * Signal state manager thread if session fore channel is drained
 386  */
 387 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 388 {
 389         struct rpc_task *task;
 390
 391         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 392                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 393                 if (task)
 394                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 395                 return;
 396         }
 397
 398         if (ses->fc_slot_table.highest_used_slotid != -1)
 399                 return;
 400
 401         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 402         complete(&ses->fc_slot_table.complete);
 403 }
 404
 405 /*
 406  * Signal state manager thread if session back channel is drained
 407  */
 408 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 409 {
 410         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 411             ses->bc_slot_table.highest_used_slotid != -1)
 412                 return;
 413         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 414         complete(&ses->bc_slot_table.complete);
 415 }
 416
 417 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 418 {
 419         struct nfs4_slot_table *tbl;
 420
 421         tbl = &res->sr_session->fc_slot_table;
 422         if (!res->sr_slot) {
 423                 /* just wake up the next guy waiting since
 424                  * we may have not consumed a slot after all */
 425                 dprintk("%s: No slot\n", __func__);
 426                 return;
 427         }
 428
 429         spin_lock(&tbl->slot_tbl_lock);
 430         nfs4_free_slot(tbl, res->sr_slot);
 431         nfs4_check_drain_fc_complete(res->sr_session);
 432         spin_unlock(&tbl->slot_tbl_lock);
 433         res->sr_slot = NULL;
 434 }
 435
 436 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 437 {
 438         unsigned long timestamp;
 439         struct nfs_client *clp;
 440
 441         /*
 442          * sr_status remains 1 if an RPC level error occurred. The server
 443          * may or may not have processed the sequence operation..
 444          * Proceed as if the server received and processed the sequence
 445          * operation.
 446          */
 447         if (res->sr_status == 1)
 448                 res->sr_status = NFS_OK;
 449
 450         /* don't increment the sequence number if the task wasn't sent */
 451         if (!RPC_WAS_SENT(task))
 452                 goto out;
 453
 454         /* Check the SEQUENCE operation status */
 455         switch (res->sr_status) {
 456         case 0:
 457                 /* Update the slot's sequence and clientid lease timer */
 458                 ++res->sr_slot->seq_nr;
 459                 timestamp = res->sr_renewal_time;
 460                 clp = res->sr_session->clp;
 461                 do_renew_lease(clp, timestamp);
 462                 /* Check sequence flags */
 463                 if (res->sr_status_flags != 0)
 464                         nfs4_schedule_lease_recovery(clp);
 465                 break;
 466         case -NFS4ERR_DELAY:
 467                 /* The server detected a resend of the RPC call and
 468                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 469                  * of RFC5661.
 470                  */
 471                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 472                         __func__,
 473                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 474                         res->sr_slot->seq_nr);
 475                 goto out_retry;
 476         default:
 477                 /* Just update the slot sequence no. */
 478                 ++res->sr_slot->seq_nr;
 479         }
 480 out:
 481         /* The session may be reset by one of the error handlers. */
 482         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 483         nfs41_sequence_free_slot(res);
 484         return 1;
 485 out_retry:
 486         if (!rpc_restart_call(task))
 487                 goto out;
 488         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 489         return 0;
 490 }
 491
 492 static int nfs4_sequence_done(struct rpc_task *task,
 493                                struct nfs4_sequence_res *res)
 494 {
 495         if (res->sr_session == NULL)
 496                 return 1;
 497         return nfs41_sequence_done(task, res);
 498 }
 499
 500 /*
 501  * nfs4_find_slot - efficiently look for a free slot
 502  *
 503  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 504  * If found, we mark the slot as used, update the highest_used_slotid,
 505  * and respectively set up the sequence operation args.
 506  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 507  *
 508  * Note: must be called with under the slot_tbl_lock.
 509  */
 510 static u8
 511 nfs4_find_slot(struct nfs4_slot_table *tbl)
 512 {
 513         int slotid;
 514         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 515         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 516
 517         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 518                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 519                 tbl->max_slots);
 520         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 521         if (slotid >= tbl->max_slots)
 522                 goto out;
 523         __set_bit(slotid, tbl->used_slots);
 524         if (slotid > tbl->highest_used_slotid)
 525                 tbl->highest_used_slotid = slotid;
 526         ret_id = slotid;
 527 out:
 528         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 529                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 530         return ret_id;
 531 }
 532
 533 int nfs41_setup_sequence(struct nfs4_session *session,
 534                                 struct nfs4_sequence_args *args,
 535                                 struct nfs4_sequence_res *res,
 536                                 int cache_reply,
 537                                 struct rpc_task *task)
 538 {
 539         struct nfs4_slot *slot;
 540         struct nfs4_slot_table *tbl;
 541         u8 slotid;
 542
 543         dprintk("--> %s\n", __func__);
 544         /* slot already allocated? */
 545         if (res->sr_slot != NULL)
 546                 return 0;
 547
 548         tbl = &session->fc_slot_table;
 549
 550         spin_lock(&tbl->slot_tbl_lock);
 551         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 552             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 553                 /*
 554                  * The state manager will wait until the slot table is empty.
 555                  * Schedule the reset thread
 556                  */
 557                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 558                 spin_unlock(&tbl->slot_tbl_lock);
 559                 dprintk("%s Schedule Session Reset\n", __func__);
 560                 return -EAGAIN;
 561         }
 562
 563         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 564             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 565                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 566                 spin_unlock(&tbl->slot_tbl_lock);
 567                 dprintk("%s enforce FIFO order\n", __func__);
 568                 return -EAGAIN;
 569         }
 570
 571         slotid = nfs4_find_slot(tbl);
 572         if (slotid == NFS4_MAX_SLOT_TABLE) {
 573                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 574                 spin_unlock(&tbl->slot_tbl_lock);
 575                 dprintk("<-- %s: no free slots\n", __func__);
 576                 return -EAGAIN;
 577         }
 578         spin_unlock(&tbl->slot_tbl_lock);
 579
 580         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 581         slot = tbl->slots + slotid;
 582         args->sa_session = session;
 583         args->sa_slotid = slotid;
 584         args->sa_cache_this = cache_reply;
 585
 586         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 587
 588         res->sr_session = session;
 589         res->sr_slot = slot;
 590         res->sr_renewal_time = jiffies;
 591         res->sr_status_flags = 0;
 592         /*
 593          * sr_status is only set in decode_sequence, and so will remain
 594          * set to 1 if an rpc level failure occurs.
 595          */
 596         res->sr_status = 1;
 597         return 0;
 598 }
 599 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 600
 601 int nfs4_setup_sequence(const struct nfs_server *server,
 602                         struct nfs4_sequence_args *args,
 603                         struct nfs4_sequence_res *res,
 604                         int cache_reply,
 605                         struct rpc_task *task)
 606 {
 607         struct nfs4_session *session = nfs4_get_session(server);
 608         int ret = 0;
 609
 610         if (session == NULL) {
 611                 args->sa_session = NULL;
 612                 res->sr_session = NULL;
 613                 goto out;
 614         }
 615
 616         dprintk("--> %s clp %p session %p sr_slot %td\n",
 617                 __func__, session->clp, session, res->sr_slot ?
 618                         res->sr_slot - session->fc_slot_table.slots : -1);
 619
 620         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 621                                    task);
 622 out:
 623         dprintk("<-- %s status=%d\n", __func__, ret);
 624         return ret;
 625 }
 626
 627 struct nfs41_call_sync_data {
 628         const struct nfs_server *seq_server;
 629         struct nfs4_sequence_args *seq_args;
 630         struct nfs4_sequence_res *seq_res;
 631         int cache_reply;
 632 };
 633
 634 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 635 {
 636         struct nfs41_call_sync_data *data = calldata;
 637
 638         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 639
 640         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 641                                 data->seq_res, data->cache_reply, task))
 642                 return;
 643         rpc_call_start(task);
 644 }
 645
 646 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 647 {
 648         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 649         nfs41_call_sync_prepare(task, calldata);
 650 }
 651
 652 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 653 {
 654         struct nfs41_call_sync_data *data = calldata;
 655
 656         nfs41_sequence_done(task, data->seq_res);
 657 }
 658
 659 struct rpc_call_ops nfs41_call_sync_ops = {
 660         .rpc_call_prepare = nfs41_call_sync_prepare,
 661         .rpc_call_done = nfs41_call_sync_done,
 662 };
 663
 664 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 665         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 666         .rpc_call_done = nfs41_call_sync_done,
 667 };
 668
 669 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 670                                    struct nfs_server *server,
 671                                    struct rpc_message *msg,
 672                                    struct nfs4_sequence_args *args,
 673                                    struct nfs4_sequence_res *res,
 674                                    int cache_reply,
 675                                    int privileged)
 676 {
 677         int ret;
 678         struct rpc_task *task;
 679         struct nfs41_call_sync_data data = {
 680                 .seq_server = server,
 681                 .seq_args = args,
 682                 .seq_res = res,
 683                 .cache_reply = cache_reply,
 684         };
 685         struct rpc_task_setup task_setup = {
 686                 .rpc_client = clnt,
 687                 .rpc_message = msg,
 688                 .callback_ops = &nfs41_call_sync_ops,
 689                 .callback_data = &data
 690         };
 691
 692         res->sr_slot = NULL;
 693         if (privileged)
 694                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 695         task = rpc_run_task(&task_setup);
 696         if (IS_ERR(task))
 697                 ret = PTR_ERR(task);
 698         else {
 699                 ret = task->tk_status;
 700                 rpc_put_task(task);
 701         }
 702         return ret;
 703 }
 704
 705 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 706                             struct nfs_server *server,
 707                             struct rpc_message *msg,
 708                             struct nfs4_sequence_args *args,
 709                             struct nfs4_sequence_res *res,
 710                             int cache_reply)
 711 {
 712         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 713 }
 714
 715 #else
 716 static int nfs4_sequence_done(struct rpc_task *task,
 717                                struct nfs4_sequence_res *res)
 718 {
 719         return 1;
 720 }
 721 #endif /* CONFIG_NFS_V4_1 */
 722
 723 int _nfs4_call_sync(struct rpc_clnt *clnt,
 724                     struct nfs_server *server,
 725                     struct rpc_message *msg,
 726                     struct nfs4_sequence_args *args,
 727                     struct nfs4_sequence_res *res,
 728                     int cache_reply)
 729 {
 730         args->sa_session = res->sr_session = NULL;
 731         return rpc_call_sync(clnt, msg, 0);
 732 }
 733
 734 static inline
 735 int nfs4_call_sync(struct rpc_clnt *clnt,
 736                    struct nfs_server *server,
 737                    struct rpc_message *msg,
 738                    struct nfs4_sequence_args *args,
 739                    struct nfs4_sequence_res *res,
 740                    int cache_reply)
 741 {
 742         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 743                                                 args, res, cache_reply);
 744 }
 745
 746 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 747 {
 748         struct nfs_inode *nfsi = NFS_I(dir);
 749
 750         spin_lock(&dir->i_lock);
 751         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 752         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 753                 nfs_force_lookup_revalidate(dir);
 754         nfsi->change_attr = cinfo->after;
 755         spin_unlock(&dir->i_lock);
 756 }
 757
 758 struct nfs4_opendata {
 759         struct kref kref;
 760         struct nfs_openargs o_arg;
 761         struct nfs_openres o_res;
 762         struct nfs_open_confirmargs c_arg;
 763         struct nfs_open_confirmres c_res;
 764         struct nfs_fattr f_attr;
 765         struct nfs_fattr dir_attr;
 766         struct dentry *dir;
 767         struct dentry *dentry;
 768         struct nfs4_state_owner *owner;
 769         struct nfs4_state *state;
 770         struct iattr attrs;
 771         unsigned long timestamp;
 772         unsigned int rpc_done : 1;
 773         int rpc_status;
 774         int cancelled;
 775 };
 776
 777
 778 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 779 {
 780         p->o_res.f_attr = &p->f_attr;
 781         p->o_res.dir_attr = &p->dir_attr;
 782         p->o_res.seqid = p->o_arg.seqid;
 783         p->c_res.seqid = p->c_arg.seqid;
 784         p->o_res.server = p->o_arg.server;
 785         nfs_fattr_init(&p->f_attr);
 786         nfs_fattr_init(&p->dir_attr);
 787 }
 788
 789 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 790                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 791                 const struct iattr *attrs,
 792                 gfp_t gfp_mask)
 793 {
 794         struct dentry *parent = dget_parent(dentry);
 795         struct inode *dir = parent->d_inode;
 796         struct nfs_server *server = NFS_SERVER(dir);
 797         struct nfs4_opendata *p;
 798
 799         p = kzalloc(sizeof(*p), gfp_mask);
 800         if (p == NULL)
 801                 goto err;
 802         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 803         if (p->o_arg.seqid == NULL)
 804                 goto err_free;
 805         nfs_sb_active(dentry->d_sb);
 806         p->dentry = dget(dentry);
 807         p->dir = parent;
 808         p->owner = sp;
 809         atomic_inc(&sp->so_count);
 810         p->o_arg.fh = NFS_FH(dir);
 811         p->o_arg.open_flags = flags;
 812         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 813         p->o_arg.clientid = server->nfs_client->cl_clientid;
 814         p->o_arg.id = sp->so_owner_id.id;
 815         p->o_arg.name = &dentry->d_name;
 816         p->o_arg.server = server;
 817         p->o_arg.bitmask = server->attr_bitmask;
 818         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 819         if (flags & O_CREAT) {
 820                 u32 *s;
 821
 822                 p->o_arg.u.attrs = &p->attrs;
 823                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 824                 s = (u32 *) p->o_arg.u.verifier.data;
 825                 s[0] = jiffies;
 826                 s[1] = current->pid;
 827         }
 828         p->c_arg.fh = &p->o_res.fh;
 829         p->c_arg.stateid = &p->o_res.stateid;
 830         p->c_arg.seqid = p->o_arg.seqid;
 831         nfs4_init_opendata_res(p);
 832         kref_init(&p->kref);
 833         return p;
 834 err_free:
 835         kfree(p);
 836 err:
 837         dput(parent);
 838         return NULL;
 839 }
 840
 841 static void nfs4_opendata_free(struct kref *kref)
 842 {
 843         struct nfs4_opendata *p = container_of(kref,
 844                         struct nfs4_opendata, kref);
 845         struct super_block *sb = p->dentry->d_sb;
 846
 847         nfs_free_seqid(p->o_arg.seqid);
 848         if (p->state != NULL)
 849                 nfs4_put_open_state(p->state);
 850         nfs4_put_state_owner(p->owner);
 851         dput(p->dir);
 852         dput(p->dentry);
 853         nfs_sb_deactive(sb);
 854         kfree(p);
 855 }
 856
 857 static void nfs4_opendata_put(struct nfs4_opendata *p)
 858 {
 859         if (p != NULL)
 860                 kref_put(&p->kref, nfs4_opendata_free);
 861 }
 862
 863 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 864 {
 865         int ret;
 866
 867         ret = rpc_wait_for_completion_task(task);
 868         return ret;
 869 }
 870
 871 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 872 {
 873         int ret = 0;
 874
 875         if (open_mode & O_EXCL)
 876                 goto out;
 877         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 878                 case FMODE_READ:
 879                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 880                                 && state->n_rdonly != 0;
 881                         break;
 882                 case FMODE_WRITE:
 883                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 884                                 && state->n_wronly != 0;
 885                         break;
 886                 case FMODE_READ|FMODE_WRITE:
 887                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 888                                 && state->n_rdwr != 0;
 889         }
 890 out:
 891         return ret;
 892 }
 893
 894 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 895 {
 896         if ((delegation->type & fmode) != fmode)
 897                 return 0;
 898         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 899                 return 0;
 900         nfs_mark_delegation_referenced(delegation);
 901         return 1;
 902 }
 903
 904 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 905 {
 906         switch (fmode) {
 907                 case FMODE_WRITE:
 908                         state->n_wronly++;
 909                         break;
 910                 case FMODE_READ:
 911                         state->n_rdonly++;
 912                         break;
 913                 case FMODE_READ|FMODE_WRITE:
 914                         state->n_rdwr++;
 915         }
 916         nfs4_state_set_mode_locked(state, state->state | fmode);
 917 }
 918
 919 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 920 {
 921         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 922                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 923         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 924         switch (fmode) {
 925                 case FMODE_READ:
 926                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 927                         break;
 928                 case FMODE_WRITE:
 929                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 930                         break;
 931                 case FMODE_READ|FMODE_WRITE:
 932                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 933         }
 934 }
 935
 936 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 937 {
 938         write_seqlock(&state->seqlock);
 939         nfs_set_open_stateid_locked(state, stateid, fmode);
 940         write_sequnlock(&state->seqlock);
 941 }
 942
 943 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 944 {
 945         /*
 946          * Protect the call to nfs4_state_set_mode_locked and
 947          * serialise the stateid update
 948          */
 949         write_seqlock(&state->seqlock);
 950         if (deleg_stateid != NULL) {
 951                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 952                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 953         }
 954         if (open_stateid != NULL)
 955                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 956         write_sequnlock(&state->seqlock);
 957         spin_lock(&state->owner->so_lock);
 958         update_open_stateflags(state, fmode);
 959         spin_unlock(&state->owner->so_lock);
 960 }
 961
 962 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 963 {
 964         struct nfs_inode *nfsi = NFS_I(state->inode);
 965         struct nfs_delegation *deleg_cur;
 966         int ret = 0;
 967
 968         fmode &= (FMODE_READ|FMODE_WRITE);
 969
 970         rcu_read_lock();
 971         deleg_cur = rcu_dereference(nfsi->delegation);
 972         if (deleg_cur == NULL)
 973                 goto no_delegation;
 974
 975         spin_lock(&deleg_cur->lock);
 976         if (nfsi->delegation != deleg_cur ||
 977             (deleg_cur->type & fmode) != fmode)
 978                 goto no_delegation_unlock;
 979
 980         if (delegation == NULL)
 981                 delegation = &deleg_cur->stateid;
 982         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 983                 goto no_delegation_unlock;
 984
 985         nfs_mark_delegation_referenced(deleg_cur);
 986         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 987         ret = 1;
 988 no_delegation_unlock:
 989         spin_unlock(&deleg_cur->lock);
 990 no_delegation:
 991         rcu_read_unlock();
 992
 993         if (!ret && open_stateid != NULL) {
 994                 __update_open_stateid(state, open_stateid, NULL, fmode);
 995                 ret = 1;
 996         }
 997
 998         return ret;
 999 }
1000
1001
1002 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1003 {
1004         struct nfs_delegation *delegation;
1005
1006         rcu_read_lock();
1007         delegation = rcu_dereference(NFS_I(inode)->delegation);
1008         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1009                 rcu_read_unlock();
1010                 return;
1011         }
1012         rcu_read_unlock();
1013         nfs_inode_return_delegation(inode);
1014 }
1015
1016 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1017 {
1018         struct nfs4_state *state = opendata->state;
1019         struct nfs_inode *nfsi = NFS_I(state->inode);
1020         struct nfs_delegation *delegation;
1021         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1022         fmode_t fmode = opendata->o_arg.fmode;
1023         nfs4_stateid stateid;
1024         int ret = -EAGAIN;
1025
1026         for (;;) {
1027                 if (can_open_cached(state, fmode, open_mode)) {
1028                         spin_lock(&state->owner->so_lock);
1029                         if (can_open_cached(state, fmode, open_mode)) {
1030                                 update_open_stateflags(state, fmode);
1031                                 spin_unlock(&state->owner->so_lock);
1032                                 goto out_return_state;
1033                         }
1034                         spin_unlock(&state->owner->so_lock);
1035                 }
1036                 rcu_read_lock();
1037                 delegation = rcu_dereference(nfsi->delegation);
1038                 if (delegation == NULL ||
1039                     !can_open_delegated(delegation, fmode)) {
1040                         rcu_read_unlock();
1041                         break;
1042                 }
1043                 /* Save the delegation */
1044                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1045                 rcu_read_unlock();
1046                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1047                 if (ret != 0)
1048                         goto out;
1049                 ret = -EAGAIN;
1050
1051                 /* Try to update the stateid using the delegation */
1052                 if (update_open_stateid(state, NULL, &stateid, fmode))
1053                         goto out_return_state;
1054         }
1055 out:
1056         return ERR_PTR(ret);
1057 out_return_state:
1058         atomic_inc(&state->count);
1059         return state;
1060 }
1061
1062 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1063 {
1064         struct inode *inode;
1065         struct nfs4_state *state = NULL;
1066         struct nfs_delegation *delegation;
1067         int ret;
1068
1069         if (!data->rpc_done) {
1070                 state = nfs4_try_open_cached(data);
1071                 goto out;
1072         }
1073
1074         ret = -EAGAIN;
1075         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1076                 goto err;
1077         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1078         ret = PTR_ERR(inode);
1079         if (IS_ERR(inode))
1080                 goto err;
1081         ret = -ENOMEM;
1082         state = nfs4_get_open_state(inode, data->owner);
1083         if (state == NULL)
1084                 goto err_put_inode;
1085         if (data->o_res.delegation_type != 0) {
1086                 int delegation_flags = 0;
1087
1088                 rcu_read_lock();
1089                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1090                 if (delegation)
1091                         delegation_flags = delegation->flags;
1092                 rcu_read_unlock();
1093                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1094                         nfs_inode_set_delegation(state->inode,
1095                                         data->owner->so_cred,
1096                                         &data->o_res);
1097                 else
1098                         nfs_inode_reclaim_delegation(state->inode,
1099                                         data->owner->so_cred,
1100                                         &data->o_res);
1101         }
1102
1103         update_open_stateid(state, &data->o_res.stateid, NULL,
1104                         data->o_arg.fmode);
1105         iput(inode);
1106 out:
1107         return state;
1108 err_put_inode:
1109         iput(inode);
1110 err:
1111         return ERR_PTR(ret);
1112 }
1113
1114 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1115 {
1116         struct nfs_inode *nfsi = NFS_I(state->inode);
1117         struct nfs_open_context *ctx;
1118
1119         spin_lock(&state->inode->i_lock);
1120         list_for_each_entry(ctx, &nfsi->open_files, list) {
1121                 if (ctx->state != state)
1122                         continue;
1123                 get_nfs_open_context(ctx);
1124                 spin_unlock(&state->inode->i_lock);
1125                 return ctx;
1126         }
1127         spin_unlock(&state->inode->i_lock);
1128         return ERR_PTR(-ENOENT);
1129 }
1130
1131 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1132 {
1133         struct nfs4_opendata *opendata;
1134
1135         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1136         if (opendata == NULL)
1137                 return ERR_PTR(-ENOMEM);
1138         opendata->state = state;
1139         atomic_inc(&state->count);
1140         return opendata;
1141 }
1142
1143 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1144 {
1145         struct nfs4_state *newstate;
1146         int ret;
1147
1148         opendata->o_arg.open_flags = 0;
1149         opendata->o_arg.fmode = fmode;
1150         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1151         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1152         nfs4_init_opendata_res(opendata);
1153         ret = _nfs4_recover_proc_open(opendata);
1154         if (ret != 0)
1155                 return ret;
1156         newstate = nfs4_opendata_to_nfs4_state(opendata);
1157         if (IS_ERR(newstate))
1158                 return PTR_ERR(newstate);
1159         nfs4_close_state(newstate, fmode);
1160         *res = newstate;
1161         return 0;
1162 }
1163
1164 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1165 {
1166         struct nfs4_state *newstate;
1167         int ret;
1168
1169         /* memory barrier prior to reading state->n_* */
1170         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1171         smp_rmb();
1172         if (state->n_rdwr != 0) {
1173                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1174                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1175                 if (ret != 0)
1176                         return ret;
1177                 if (newstate != state)
1178                         return -ESTALE;
1179         }
1180         if (state->n_wronly != 0) {
1181                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1182                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1183                 if (ret != 0)
1184                         return ret;
1185                 if (newstate != state)
1186                         return -ESTALE;
1187         }
1188         if (state->n_rdonly != 0) {
1189                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1190                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1191                 if (ret != 0)
1192                         return ret;
1193                 if (newstate != state)
1194                         return -ESTALE;
1195         }
1196         /*
1197          * We may have performed cached opens for all three recoveries.
1198          * Check if we need to update the current stateid.
1199          */
1200         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1201             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1202                 write_seqlock(&state->seqlock);
1203                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1204                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1205                 write_sequnlock(&state->seqlock);
1206         }
1207         return 0;
1208 }
1209
1210 /*
1211  * OPEN_RECLAIM:
1212  *      reclaim state on the server after a reboot.
1213  */
1214 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1215 {
1216         struct nfs_delegation *delegation;
1217         struct nfs4_opendata *opendata;
1218         fmode_t delegation_type = 0;
1219         int status;
1220
1221         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1222         if (IS_ERR(opendata))
1223                 return PTR_ERR(opendata);
1224         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1225         opendata->o_arg.fh = NFS_FH(state->inode);
1226         rcu_read_lock();
1227         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1228         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1229                 delegation_type = delegation->type;
1230         rcu_read_unlock();
1231         opendata->o_arg.u.delegation_type = delegation_type;
1232         status = nfs4_open_recover(opendata, state);
1233         nfs4_opendata_put(opendata);
1234         return status;
1235 }
1236
1237 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1238 {
1239         struct nfs_server *server = NFS_SERVER(state->inode);
1240         struct nfs4_exception exception = { };
1241         int err;
1242         do {
1243                 err = _nfs4_do_open_reclaim(ctx, state);
1244                 if (err != -NFS4ERR_DELAY)
1245                         break;
1246                 nfs4_handle_exception(server, err, &exception);
1247         } while (exception.retry);
1248         return err;
1249 }
1250
1251 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1252 {
1253         struct nfs_open_context *ctx;
1254         int ret;
1255
1256         ctx = nfs4_state_find_open_context(state);
1257         if (IS_ERR(ctx))
1258                 return PTR_ERR(ctx);
1259         ret = nfs4_do_open_reclaim(ctx, state);
1260         put_nfs_open_context(ctx);
1261         return ret;
1262 }
1263
1264 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1265 {
1266         struct nfs4_opendata *opendata;
1267         int ret;
1268
1269         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1270         if (IS_ERR(opendata))
1271                 return PTR_ERR(opendata);
1272         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1273         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1274                         sizeof(opendata->o_arg.u.delegation.data));
1275         ret = nfs4_open_recover(opendata, state);
1276         nfs4_opendata_put(opendata);
1277         return ret;
1278 }
1279
1280 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1281 {
1282         struct nfs4_exception exception = { };
1283         struct nfs_server *server = NFS_SERVER(state->inode);
1284         int err;
1285         do {
1286                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1287                 switch (err) {
1288                         case 0:
1289                         case -ENOENT:
1290                         case -ESTALE:
1291                                 goto out;
1292                         case -NFS4ERR_BADSESSION:
1293                         case -NFS4ERR_BADSLOT:
1294                         case -NFS4ERR_BAD_HIGH_SLOT:
1295                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1296                         case -NFS4ERR_DEADSESSION:
1297                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1298                                 goto out;
1299                         case -NFS4ERR_STALE_CLIENTID:
1300                         case -NFS4ERR_STALE_STATEID:
1301                         case -NFS4ERR_EXPIRED:
1302                                 /* Don't recall a delegation if it was lost */
1303                                 nfs4_schedule_lease_recovery(server->nfs_client);
1304                                 goto out;
1305                         case -ERESTARTSYS:
1306                                 /*
1307                                  * The show must go on: exit, but mark the
1308                                  * stateid as needing recovery.
1309                                  */
1310                         case -NFS4ERR_ADMIN_REVOKED:
1311                         case -NFS4ERR_BAD_STATEID:
1312                                 nfs4_schedule_stateid_recovery(server, state);
1313                         case -EKEYEXPIRED:
1314                                 /*
1315                                  * User RPCSEC_GSS context has expired.
1316                                  * We cannot recover this stateid now, so
1317                                  * skip it and allow recovery thread to
1318                                  * proceed.
1319                                  */
1320                         case -ENOMEM:
1321                                 err = 0;
1322                                 goto out;
1323                 }
1324                 err = nfs4_handle_exception(server, err, &exception);
1325         } while (exception.retry);
1326 out:
1327         return err;
1328 }
1329
1330 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1331 {
1332         struct nfs4_opendata *data = calldata;
1333
1334         data->rpc_status = task->tk_status;
1335         if (data->rpc_status == 0) {
1336                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1337                                 sizeof(data->o_res.stateid.data));
1338                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1339                 renew_lease(data->o_res.server, data->timestamp);
1340                 data->rpc_done = 1;
1341         }
1342 }
1343
1344 static void nfs4_open_confirm_release(void *calldata)
1345 {
1346         struct nfs4_opendata *data = calldata;
1347         struct nfs4_state *state = NULL;
1348
1349         /* If this request hasn't been cancelled, do nothing */
1350         if (data->cancelled == 0)
1351                 goto out_free;
1352         /* In case of error, no cleanup! */
1353         if (!data->rpc_done)
1354                 goto out_free;
1355         state = nfs4_opendata_to_nfs4_state(data);
1356         if (!IS_ERR(state))
1357                 nfs4_close_state(state, data->o_arg.fmode);
1358 out_free:
1359         nfs4_opendata_put(data);
1360 }
1361
1362 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1363         .rpc_call_done = nfs4_open_confirm_done,
1364         .rpc_release = nfs4_open_confirm_release,
1365 };
1366
1367 /*
1368  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1369  */
1370 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1371 {
1372         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1373         struct rpc_task *task;
1374         struct  rpc_message msg = {
1375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1376                 .rpc_argp = &data->c_arg,
1377                 .rpc_resp = &data->c_res,
1378                 .rpc_cred = data->owner->so_cred,
1379         };
1380         struct rpc_task_setup task_setup_data = {
1381                 .rpc_client = server->client,
1382                 .rpc_message = &msg,
1383                 .callback_ops = &nfs4_open_confirm_ops,
1384                 .callback_data = data,
1385                 .workqueue = nfsiod_workqueue,
1386                 .flags = RPC_TASK_ASYNC,
1387         };
1388         int status;
1389
1390         kref_get(&data->kref);
1391         data->rpc_done = 0;
1392         data->rpc_status = 0;
1393         data->timestamp = jiffies;
1394         task = rpc_run_task(&task_setup_data);
1395         if (IS_ERR(task))
1396                 return PTR_ERR(task);
1397         status = nfs4_wait_for_completion_rpc_task(task);
1398         if (status != 0) {
1399                 data->cancelled = 1;
1400                 smp_wmb();
1401         } else
1402                 status = data->rpc_status;
1403         rpc_put_task(task);
1404         return status;
1405 }
1406
1407 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1408 {
1409         struct nfs4_opendata *data = calldata;
1410         struct nfs4_state_owner *sp = data->owner;
1411
1412         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1413                 return;
1414         /*
1415          * Check if we still need to send an OPEN call, or if we can use
1416          * a delegation instead.
1417          */
1418         if (data->state != NULL) {
1419                 struct nfs_delegation *delegation;
1420
1421                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1422                         goto out_no_action;
1423                 rcu_read_lock();
1424                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1425                 if (delegation != NULL &&
1426                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1427                         rcu_read_unlock();
1428                         goto out_no_action;
1429                 }
1430                 rcu_read_unlock();
1431         }
1432         /* Update sequence id. */
1433         data->o_arg.id = sp->so_owner_id.id;
1434         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1435         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1436                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1437                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1438         }
1439         data->timestamp = jiffies;
1440         if (nfs4_setup_sequence(data->o_arg.server,
1441                                 &data->o_arg.seq_args,
1442                                 &data->o_res.seq_res, 1, task))
1443                 return;
1444         rpc_call_start(task);
1445         return;
1446 out_no_action:
1447         task->tk_action = NULL;
1448
1449 }
1450
1451 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1452 {
1453         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1454         nfs4_open_prepare(task, calldata);
1455 }
1456
1457 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1458 {
1459         struct nfs4_opendata *data = calldata;
1460
1461         data->rpc_status = task->tk_status;
1462
1463         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1464                 return;
1465
1466         if (task->tk_status == 0) {
1467                 switch (data->o_res.f_attr->mode & S_IFMT) {
1468                         case S_IFREG:
1469                                 break;
1470                         case S_IFLNK:
1471                                 data->rpc_status = -ELOOP;
1472                                 break;
1473                         case S_IFDIR:
1474                                 data->rpc_status = -EISDIR;
1475                                 break;
1476                         default:
1477                                 data->rpc_status = -ENOTDIR;
1478                 }
1479                 renew_lease(data->o_res.server, data->timestamp);
1480                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1481                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1482         }
1483         data->rpc_done = 1;
1484 }
1485
1486 static void nfs4_open_release(void *calldata)
1487 {
1488         struct nfs4_opendata *data = calldata;
1489         struct nfs4_state *state = NULL;
1490
1491         /* If this request hasn't been cancelled, do nothing */
1492         if (data->cancelled == 0)
1493                 goto out_free;
1494         /* In case of error, no cleanup! */
1495         if (data->rpc_status != 0 || !data->rpc_done)
1496                 goto out_free;
1497         /* In case we need an open_confirm, no cleanup! */
1498         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1499                 goto out_free;
1500         state = nfs4_opendata_to_nfs4_state(data);
1501         if (!IS_ERR(state))
1502                 nfs4_close_state(state, data->o_arg.fmode);
1503 out_free:
1504         nfs4_opendata_put(data);
1505 }
1506
1507 static const struct rpc_call_ops nfs4_open_ops = {
1508         .rpc_call_prepare = nfs4_open_prepare,
1509         .rpc_call_done = nfs4_open_done,
1510         .rpc_release = nfs4_open_release,
1511 };
1512
1513 static const struct rpc_call_ops nfs4_recover_open_ops = {
1514         .rpc_call_prepare = nfs4_recover_open_prepare,
1515         .rpc_call_done = nfs4_open_done,
1516         .rpc_release = nfs4_open_release,
1517 };
1518
1519 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1520 {
1521         struct inode *dir = data->dir->d_inode;
1522         struct nfs_server *server = NFS_SERVER(dir);
1523         struct nfs_openargs *o_arg = &data->o_arg;
1524         struct nfs_openres *o_res = &data->o_res;
1525         struct rpc_task *task;
1526         struct rpc_message msg = {
1527                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1528                 .rpc_argp = o_arg,
1529                 .rpc_resp = o_res,
1530                 .rpc_cred = data->owner->so_cred,
1531         };
1532         struct rpc_task_setup task_setup_data = {
1533                 .rpc_client = server->client,
1534                 .rpc_message = &msg,
1535                 .callback_ops = &nfs4_open_ops,
1536                 .callback_data = data,
1537                 .workqueue = nfsiod_workqueue,
1538                 .flags = RPC_TASK_ASYNC,
1539         };
1540         int status;
1541
1542         kref_get(&data->kref);
1543         data->rpc_done = 0;
1544         data->rpc_status = 0;
1545         data->cancelled = 0;
1546         if (isrecover)
1547                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1548         task = rpc_run_task(&task_setup_data);
1549         if (IS_ERR(task))
1550                 return PTR_ERR(task);
1551         status = nfs4_wait_for_completion_rpc_task(task);
1552         if (status != 0) {
1553                 data->cancelled = 1;
1554                 smp_wmb();
1555         } else
1556                 status = data->rpc_status;
1557         rpc_put_task(task);
1558
1559         return status;
1560 }
1561
1562 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1563 {
1564         struct inode *dir = data->dir->d_inode;
1565         struct nfs_openres *o_res = &data->o_res;
1566         int status;
1567
1568         status = nfs4_run_open_task(data, 1);
1569         if (status != 0 || !data->rpc_done)
1570                 return status;
1571
1572         nfs_refresh_inode(dir, o_res->dir_attr);
1573
1574         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1575                 status = _nfs4_proc_open_confirm(data);
1576                 if (status != 0)
1577                         return status;
1578         }
1579
1580         return status;
1581 }
1582
1583 /*
1584  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1585  */
1586 static int _nfs4_proc_open(struct nfs4_opendata *data)
1587 {
1588         struct inode *dir = data->dir->d_inode;
1589         struct nfs_server *server = NFS_SERVER(dir);
1590         struct nfs_openargs *o_arg = &data->o_arg;
1591         struct nfs_openres *o_res = &data->o_res;
1592         int status;
1593
1594         status = nfs4_run_open_task(data, 0);
1595         if (status != 0 || !data->rpc_done)
1596                 return status;
1597
1598         if (o_arg->open_flags & O_CREAT) {
1599                 update_changeattr(dir, &o_res->cinfo);
1600                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1601         } else
1602                 nfs_refresh_inode(dir, o_res->dir_attr);
1603         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1604                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1605         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1606                 status = _nfs4_proc_open_confirm(data);
1607                 if (status != 0)
1608                         return status;
1609         }
1610         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1611                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1612         return 0;
1613 }
1614
1615 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1616 {
1617         unsigned int loop;
1618         int ret;
1619
1620         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1621                 ret = nfs4_wait_clnt_recover(clp);
1622                 if (ret != 0)
1623                         break;
1624                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1625                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1626                         break;
1627                 nfs4_schedule_state_manager(clp);
1628                 ret = -EIO;
1629         }
1630         return ret;
1631 }
1632
1633 static int nfs4_recover_expired_lease(struct nfs_server *server)
1634 {
1635         return nfs4_client_recover_expired_lease(server->nfs_client);
1636 }
1637
1638 /*
1639  * OPEN_EXPIRED:
1640  *      reclaim state on the server after a network partition.
1641  *      Assumes caller holds the appropriate lock
1642  */
1643 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1644 {
1645         struct nfs4_opendata *opendata;
1646         int ret;
1647
1648         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1649         if (IS_ERR(opendata))
1650                 return PTR_ERR(opendata);
1651         ret = nfs4_open_recover(opendata, state);
1652         if (ret == -ESTALE)
1653                 d_drop(ctx->dentry);
1654         nfs4_opendata_put(opendata);
1655         return ret;
1656 }
1657
1658 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1659 {
1660         struct nfs_server *server = NFS_SERVER(state->inode);
1661         struct nfs4_exception exception = { };
1662         int err;
1663
1664         do {
1665                 err = _nfs4_open_expired(ctx, state);
1666                 switch (err) {
1667                 default:
1668                         goto out;
1669                 case -NFS4ERR_GRACE:
1670                 case -NFS4ERR_DELAY:
1671                         nfs4_handle_exception(server, err, &exception);
1672                         err = 0;
1673                 }
1674         } while (exception.retry);
1675 out:
1676         return err;
1677 }
1678
1679 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1680 {
1681         struct nfs_open_context *ctx;
1682         int ret;
1683
1684         ctx = nfs4_state_find_open_context(state);
1685         if (IS_ERR(ctx))
1686                 return PTR_ERR(ctx);
1687         ret = nfs4_do_open_expired(ctx, state);
1688         put_nfs_open_context(ctx);
1689         return ret;
1690 }
1691
1692 /*
1693  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1694  * fields corresponding to attributes that were used to store the verifier.
1695  * Make sure we clobber those fields in the later setattr call
1696  */
1697 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1698 {
1699         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1700             !(sattr->ia_valid & ATTR_ATIME_SET))
1701                 sattr->ia_valid |= ATTR_ATIME;
1702
1703         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1704             !(sattr->ia_valid & ATTR_MTIME_SET))
1705                 sattr->ia_valid |= ATTR_MTIME;
1706 }
1707
1708 /*
1709  * Returns a referenced nfs4_state
1710  */
1711 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1712 {
1713         struct nfs4_state_owner  *sp;
1714         struct nfs4_state     *state = NULL;
1715         struct nfs_server       *server = NFS_SERVER(dir);
1716         struct nfs4_opendata *opendata;
1717         int status;
1718
1719         /* Protect against reboot recovery conflicts */
1720         status = -ENOMEM;
1721         if (!(sp = nfs4_get_state_owner(server, cred))) {
1722                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1723                 goto out_err;
1724         }
1725         status = nfs4_recover_expired_lease(server);
1726         if (status != 0)
1727                 goto err_put_state_owner;
1728         if (dentry->d_inode != NULL)
1729                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1730         status = -ENOMEM;
1731         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1732         if (opendata == NULL)
1733                 goto err_put_state_owner;
1734
1735         if (dentry->d_inode != NULL)
1736                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1737
1738         status = _nfs4_proc_open(opendata);
1739         if (status != 0)
1740                 goto err_opendata_put;
1741
1742         state = nfs4_opendata_to_nfs4_state(opendata);
1743         status = PTR_ERR(state);
1744         if (IS_ERR(state))
1745                 goto err_opendata_put;
1746         if (server->caps & NFS_CAP_POSIX_LOCK)
1747                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1748
1749         if (opendata->o_arg.open_flags & O_EXCL) {
1750                 nfs4_exclusive_attrset(opendata, sattr);
1751
1752                 nfs_fattr_init(opendata->o_res.f_attr);
1753                 status = nfs4_do_setattr(state->inode, cred,
1754                                 opendata->o_res.f_attr, sattr,
1755                                 state);
1756                 if (status == 0)
1757                         nfs_setattr_update_inode(state->inode, sattr);
1758                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1759         }
1760         nfs4_opendata_put(opendata);
1761         nfs4_put_state_owner(sp);
1762         *res = state;
1763         return 0;
1764 err_opendata_put:
1765         nfs4_opendata_put(opendata);
1766 err_put_state_owner:
1767         nfs4_put_state_owner(sp);
1768 out_err:
1769         *res = NULL;
1770         return status;
1771 }
1772
1773
1774 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1775 {
1776         struct nfs4_exception exception = { };
1777         struct nfs4_state *res;
1778         int status;
1779
1780         do {
1781                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1782                 if (status == 0)
1783                         break;
1784                 /* NOTE: BAD_SEQID means the server and client disagree about the
1785                  * book-keeping w.r.t. state-changing operations
1786                  * (OPEN/CLOSE/LOCK/LOCKU...)
1787                  * It is actually a sign of a bug on the client or on the server.
1788                  *
1789                  * If we receive a BAD_SEQID error in the particular case of
1790                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1791                  * have unhashed the old state_owner for us, and that we can
1792                  * therefore safely retry using a new one. We should still warn
1793                  * the user though...
1794                  */
1795                 if (status == -NFS4ERR_BAD_SEQID) {
1796                         printk(KERN_WARNING "NFS: v4 server %s "
1797                                         " returned a bad sequence-id error!\n",
1798                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1799                         exception.retry = 1;
1800                         continue;
1801                 }
1802                 /*
1803                  * BAD_STATEID on OPEN means that the server cancelled our
1804                  * state before it received the OPEN_CONFIRM.
1805                  * Recover by retrying the request as per the discussion
1806                  * on Page 181 of RFC3530.
1807                  */
1808                 if (status == -NFS4ERR_BAD_STATEID) {
1809                         exception.retry = 1;
1810                         continue;
1811                 }
1812                 if (status == -EAGAIN) {
1813                         /* We must have found a delegation */
1814                         exception.retry = 1;
1815                         continue;
1816                 }
1817                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1818                                         status, &exception));
1819         } while (exception.retry);
1820         return res;
1821 }
1822
1823 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1824                             struct nfs_fattr *fattr, struct iattr *sattr,
1825                             struct nfs4_state *state)
1826 {
1827         struct nfs_server *server = NFS_SERVER(inode);
1828         struct nfs_setattrargs  arg = {
1829                 .fh             = NFS_FH(inode),
1830                 .iap            = sattr,
1831                 .server         = server,
1832                 .bitmask = server->attr_bitmask,
1833         };
1834         struct nfs_setattrres  res = {
1835                 .fattr          = fattr,
1836                 .server         = server,
1837         };
1838         struct rpc_message msg = {
1839                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1840                 .rpc_argp       = &arg,
1841                 .rpc_resp       = &res,
1842                 .rpc_cred       = cred,
1843         };
1844         unsigned long timestamp = jiffies;
1845         int status;
1846
1847         nfs_fattr_init(fattr);
1848
1849         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1850                 /* Use that stateid */
1851         } else if (state != NULL) {
1852                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1853         } else
1854                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1855
1856         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1857         if (status == 0 && state != NULL)
1858                 renew_lease(server, timestamp);
1859         return status;
1860 }
1861
1862 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1863                            struct nfs_fattr *fattr, struct iattr *sattr,
1864                            struct nfs4_state *state)
1865 {
1866         struct nfs_server *server = NFS_SERVER(inode);
1867         struct nfs4_exception exception = { };
1868         int err;
1869         do {
1870                 err = nfs4_handle_exception(server,
1871                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1872                                 &exception);
1873         } while (exception.retry);
1874         return err;
1875 }
1876
1877 struct nfs4_closedata {
1878         struct inode *inode;
1879         struct nfs4_state *state;
1880         struct nfs_closeargs arg;
1881         struct nfs_closeres res;
1882         struct nfs_fattr fattr;
1883         unsigned long timestamp;
1884         bool roc;
1885         u32 roc_barrier;
1886 };
1887
1888 static void nfs4_free_closedata(void *data)
1889 {
1890         struct nfs4_closedata *calldata = data;
1891         struct nfs4_state_owner *sp = calldata->state->owner;
1892         struct super_block *sb = calldata->state->inode->i_sb;
1893
1894         if (calldata->roc)
1895                 pnfs_roc_release(calldata->state->inode);
1896         nfs4_put_open_state(calldata->state);
1897         nfs_free_seqid(calldata->arg.seqid);
1898         nfs4_put_state_owner(sp);
1899         nfs_sb_deactive(sb);
1900         kfree(calldata);
1901 }
1902
1903 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1904                 fmode_t fmode)
1905 {
1906         spin_lock(&state->owner->so_lock);
1907         if (!(fmode & FMODE_READ))
1908                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1909         if (!(fmode & FMODE_WRITE))
1910                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1911         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1912         spin_unlock(&state->owner->so_lock);
1913 }
1914
1915 static void nfs4_close_done(struct rpc_task *task, void *data)
1916 {
1917         struct nfs4_closedata *calldata = data;
1918         struct nfs4_state *state = calldata->state;
1919         struct nfs_server *server = NFS_SERVER(calldata->inode);
1920
1921         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1922                 return;
1923         /* hmm. we are done with the inode, and in the process of freeing
1924          * the state_owner. we keep this around to process errors
1925          */
1926         switch (task->tk_status) {
1927                 case 0:
1928                         if (calldata->roc)
1929                                 pnfs_roc_set_barrier(state->inode,
1930                                                      calldata->roc_barrier);
1931                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1932                         renew_lease(server, calldata->timestamp);
1933                         nfs4_close_clear_stateid_flags(state,
1934                                         calldata->arg.fmode);
1935                         break;
1936                 case -NFS4ERR_STALE_STATEID:
1937                 case -NFS4ERR_OLD_STATEID:
1938                 case -NFS4ERR_BAD_STATEID:
1939                 case -NFS4ERR_EXPIRED:
1940                         if (calldata->arg.fmode == 0)
1941                                 break;
1942                 default:
1943                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1944                                 rpc_restart_call_prepare(task);
1945         }
1946         nfs_release_seqid(calldata->arg.seqid);
1947         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1948 }
1949
1950 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1951 {
1952         struct nfs4_closedata *calldata = data;
1953         struct nfs4_state *state = calldata->state;
1954         int call_close = 0;
1955
1956         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1957                 return;
1958
1959         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1960         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1961         spin_lock(&state->owner->so_lock);
1962         /* Calculate the change in open mode */
1963         if (state->n_rdwr == 0) {
1964                 if (state->n_rdonly == 0) {
1965                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1966                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1967                         calldata->arg.fmode &= ~FMODE_READ;
1968                 }
1969                 if (state->n_wronly == 0) {
1970                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1971                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1972                         calldata->arg.fmode &= ~FMODE_WRITE;
1973                 }
1974         }
1975         spin_unlock(&state->owner->so_lock);
1976
1977         if (!call_close) {
1978                 /* Note: exit _without_ calling nfs4_close_done */
1979                 task->tk_action = NULL;
1980                 return;
1981         }
1982
1983         if (calldata->arg.fmode == 0) {
1984                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1985                 if (calldata->roc &&
1986                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1987                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1988                                      task, NULL);
1989                         return;
1990                 }
1991         }
1992
1993         nfs_fattr_init(calldata->res.fattr);
1994         calldata->timestamp = jiffies;
1995         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1996                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1997                                 1, task))
1998                 return;
1999         rpc_call_start(task);
2000 }
2001
2002 static const struct rpc_call_ops nfs4_close_ops = {
2003         .rpc_call_prepare = nfs4_close_prepare,
2004         .rpc_call_done = nfs4_close_done,
2005         .rpc_release = nfs4_free_closedata,
2006 };
2007
2008 /*
2009  * It is possible for data to be read/written from a mem-mapped file
2010  * after the sys_close call (which hits the vfs layer as a flush).
2011  * This means that we can't safely call nfsv4 close on a file until
2012  * the inode is cleared. This in turn means that we are not good
2013  * NFSv4 citizens - we do not indicate to the server to update the file's
2014  * share state even when we are done with one of the three share
2015  * stateid's in the inode.
2016  *
2017  * NOTE: Caller must be holding the sp->so_owner semaphore!
2018  */
2019 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2020 {
2021         struct nfs_server *server = NFS_SERVER(state->inode);
2022         struct nfs4_closedata *calldata;
2023         struct nfs4_state_owner *sp = state->owner;
2024         struct rpc_task *task;
2025         struct rpc_message msg = {
2026                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2027                 .rpc_cred = state->owner->so_cred,
2028         };
2029         struct rpc_task_setup task_setup_data = {
2030                 .rpc_client = server->client,
2031                 .rpc_message = &msg,
2032                 .callback_ops = &nfs4_close_ops,
2033                 .workqueue = nfsiod_workqueue,
2034                 .flags = RPC_TASK_ASYNC,
2035         };
2036         int status = -ENOMEM;
2037
2038         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2039         if (calldata == NULL)
2040                 goto out;
2041         calldata->inode = state->inode;
2042         calldata->state = state;
2043         calldata->arg.fh = NFS_FH(state->inode);
2044         calldata->arg.stateid = &state->open_stateid;
2045         /* Serialization for the sequence id */
2046         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2047         if (calldata->arg.seqid == NULL)
2048                 goto out_free_calldata;
2049         calldata->arg.fmode = 0;
2050         calldata->arg.bitmask = server->cache_consistency_bitmask;
2051         calldata->res.fattr = &calldata->fattr;
2052         calldata->res.seqid = calldata->arg.seqid;
2053         calldata->res.server = server;
2054         calldata->roc = roc;
2055         nfs_sb_active(calldata->inode->i_sb);
2056
2057         msg.rpc_argp = &calldata->arg;
2058         msg.rpc_resp = &calldata->res;
2059         task_setup_data.callback_data = calldata;
2060         task = rpc_run_task(&task_setup_data);
2061         if (IS_ERR(task))
2062                 return PTR_ERR(task);
2063         status = 0;
2064         if (wait)
2065                 status = rpc_wait_for_completion_task(task);
2066         rpc_put_task(task);
2067         return status;
2068 out_free_calldata:
2069         kfree(calldata);
2070 out:
2071         if (roc)
2072                 pnfs_roc_release(state->inode);
2073         nfs4_put_open_state(state);
2074         nfs4_put_state_owner(sp);
2075         return status;
2076 }
2077
2078 static struct inode *
2079 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2080 {
2081         struct nfs4_state *state;
2082
2083         /* Protect against concurrent sillydeletes */
2084         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2085         if (IS_ERR(state))
2086                 return ERR_CAST(state);
2087         ctx->state = state;
2088         return igrab(state->inode);
2089 }
2090
2091 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2092 {
2093         if (ctx->state == NULL)
2094                 return;
2095         if (is_sync)
2096                 nfs4_close_sync(ctx->state, ctx->mode);
2097         else
2098                 nfs4_close_state(ctx->state, ctx->mode);
2099 }
2100
2101 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2102 {
2103         struct nfs4_server_caps_arg args = {
2104                 .fhandle = fhandle,
2105         };
2106         struct nfs4_server_caps_res res = {};
2107         struct rpc_message msg = {
2108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2109                 .rpc_argp = &args,
2110                 .rpc_resp = &res,
2111         };
2112         int status;
2113
2114         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2115         if (status == 0) {
2116                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2117                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2118                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2119                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2120                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2121                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2122                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2123                         server->caps |= NFS_CAP_ACLS;
2124                 if (res.has_links != 0)
2125                         server->caps |= NFS_CAP_HARDLINKS;
2126                 if (res.has_symlinks != 0)
2127                         server->caps |= NFS_CAP_SYMLINKS;
2128                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2129                         server->caps |= NFS_CAP_FILEID;
2130                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2131                         server->caps |= NFS_CAP_MODE;
2132                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2133                         server->caps |= NFS_CAP_NLINK;
2134                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2135                         server->caps |= NFS_CAP_OWNER;
2136                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2137                         server->caps |= NFS_CAP_OWNER_GROUP;
2138                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2139                         server->caps |= NFS_CAP_ATIME;
2140                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2141                         server->caps |= NFS_CAP_CTIME;
2142                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2143                         server->caps |= NFS_CAP_MTIME;
2144
2145                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2146                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2147                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2148                 server->acl_bitmask = res.acl_bitmask;
2149         }
2150
2151         return status;
2152 }
2153
2154 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2155 {
2156         struct nfs4_exception exception = { };
2157         int err;
2158         do {
2159                 err = nfs4_handle_exception(server,
2160                                 _nfs4_server_capabilities(server, fhandle),
2161                                 &exception);
2162         } while (exception.retry);
2163         return err;
2164 }
2165
2166 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2167                 struct nfs_fsinfo *info)
2168 {
2169         struct nfs4_lookup_root_arg args = {
2170                 .bitmask = nfs4_fattr_bitmap,
2171         };
2172         struct nfs4_lookup_res res = {
2173                 .server = server,
2174                 .fattr = info->fattr,
2175                 .fh = fhandle,
2176         };
2177         struct rpc_message msg = {
2178                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2179                 .rpc_argp = &args,
2180                 .rpc_resp = &res,
2181         };
2182
2183         nfs_fattr_init(info->fattr);
2184         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2185 }
2186
2187 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2188                 struct nfs_fsinfo *info)
2189 {
2190         struct nfs4_exception exception = { };
2191         int err;
2192         do {
2193                 err = _nfs4_lookup_root(server, fhandle, info);
2194                 switch (err) {
2195                 case 0:
2196                 case -NFS4ERR_WRONGSEC:
2197                         break;
2198                 default:
2199                         err = nfs4_handle_exception(server, err, &exception);
2200                 }
2201         } while (exception.retry);
2202         return err;
2203 }
2204
2205 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2206                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2207 {
2208         struct rpc_auth *auth;
2209         int ret;
2210
2211         auth = rpcauth_create(flavor, server->client);
2212         if (!auth) {
2213                 ret = -EIO;
2214                 goto out;
2215         }
2216         ret = nfs4_lookup_root(server, fhandle, info);
2217 out:
2218         return ret;
2219 }
2220
2221 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2222                               struct nfs_fsinfo *info)
2223 {
2224         int i, len, status = 0;
2225         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2226
2227         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2228         flav_array[len] = RPC_AUTH_NULL;
2229         len += 1;
2230
2231         for (i = 0; i < len; i++) {
2232                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2233                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2234                         continue;
2235                 break;
2236         }
2237         /*
2238          * -EACCESS could mean that the user doesn't have correct permissions
2239          * to access the mount.  It could also mean that we tried to mount
2240          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2241          * existing mount programs don't handle -EACCES very well so it should
2242          * be mapped to -EPERM instead.
2243          */
2244         if (status == -EACCES)
2245                 status = -EPERM;
2246         return status;
2247 }
2248
2249 /*
2250  * get the file handle for the "/" directory on the server
2251  */
2252 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2253                               struct nfs_fsinfo *info)
2254 {
2255         int status = nfs4_lookup_root(server, fhandle, info);
2256         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2257                 /*
2258                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2259                  * by nfs4_map_errors() as this function exits.
2260                  */
2261                 status = nfs4_find_root_sec(server, fhandle, info);
2262         if (status == 0)
2263                 status = nfs4_server_capabilities(server, fhandle);
2264         if (status == 0)
2265                 status = nfs4_do_fsinfo(server, fhandle, info);
2266         return nfs4_map_errors(status);
2267 }
2268
2269 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2270 /*
2271  * Get locations and (maybe) other attributes of a referral.
2272  * Note that we'll actually follow the referral later when
2273  * we detect fsid mismatch in inode revalidation
2274  */
2275 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2276                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2277 {
2278         int status = -ENOMEM;
2279         struct page *page = NULL;
2280         struct nfs4_fs_locations *locations = NULL;
2281
2282         page = alloc_page(GFP_KERNEL);
2283         if (page == NULL)
2284                 goto out;
2285         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2286         if (locations == NULL)
2287                 goto out;
2288
2289         status = nfs4_proc_fs_locations(dir, name, locations, page);
2290         if (status != 0)
2291                 goto out;
2292         /* Make sure server returned a different fsid for the referral */
2293         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2294                 dprintk("%s: server did not return a different fsid for"
2295                         " a referral at %s\n", __func__, name->name);
2296                 status = -EIO;
2297                 goto out;
2298         }
2299         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2300         nfs_fixup_referral_attributes(&locations->fattr);
2301
2302         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2303         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2304         memset(fhandle, 0, sizeof(struct nfs_fh));
2305 out:
2306         if (page)
2307                 __free_page(page);
2308         kfree(locations);
2309         return status;
2310 }
2311
2312 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2313 {
2314         struct nfs4_getattr_arg args = {
2315                 .fh = fhandle,
2316                 .bitmask = server->attr_bitmask,
2317         };
2318         struct nfs4_getattr_res res = {
2319                 .fattr = fattr,
2320                 .server = server,
2321         };
2322         struct rpc_message msg = {
2323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2324                 .rpc_argp = &args,
2325                 .rpc_resp = &res,
2326         };
2327
2328         nfs_fattr_init(fattr);
2329         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2330 }
2331
2332 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2333 {
2334         struct nfs4_exception exception = { };
2335         int err;
2336         do {
2337                 err = nfs4_handle_exception(server,
2338                                 _nfs4_proc_getattr(server, fhandle, fattr),
2339                                 &exception);
2340         } while (exception.retry);
2341         return err;
2342 }
2343
2344 /*
2345  * The file is not closed if it is opened due to the a request to change
2346  * the size of the file. The open call will not be needed once the
2347  * VFS layer lookup-intents are implemented.
2348  *
2349  * Close is called when the inode is destroyed.
2350  * If we haven't opened the file for O_WRONLY, we
2351  * need to in the size_change case to obtain a stateid.
2352  *
2353  * Got race?
2354  * Because OPEN is always done by name in nfsv4, it is
2355  * possible that we opened a different file by the same
2356  * name.  We can recognize this race condition, but we
2357  * can't do anything about it besides returning an error.
2358  *
2359  * This will be fixed with VFS changes (lookup-intent).
2360  */
2361 static int
2362 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2363                   struct iattr *sattr)
2364 {
2365         struct inode *inode = dentry->d_inode;
2366         struct rpc_cred *cred = NULL;
2367         struct nfs4_state *state = NULL;
2368         int status;
2369
2370         if (pnfs_ld_layoutret_on_setattr(inode))
2371                 pnfs_return_layout(inode);
2372
2373         nfs_fattr_init(fattr);
2374
2375         /* Search for an existing open(O_WRITE) file */
2376         if (sattr->ia_valid & ATTR_FILE) {
2377                 struct nfs_open_context *ctx;
2378
2379                 ctx = nfs_file_open_context(sattr->ia_file);
2380                 if (ctx) {
2381                         cred = ctx->cred;
2382                         state = ctx->state;
2383                 }
2384         }
2385
2386         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2387         if (status == 0)
2388                 nfs_setattr_update_inode(inode, sattr);
2389         return status;
2390 }
2391
2392 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2393                 const struct nfs_fh *dirfh, const struct qstr *name,
2394                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2395 {
2396         int                    status;
2397         struct nfs4_lookup_arg args = {
2398                 .bitmask = server->attr_bitmask,
2399                 .dir_fh = dirfh,
2400                 .name = name,
2401         };
2402         struct nfs4_lookup_res res = {
2403                 .server = server,
2404                 .fattr = fattr,
2405                 .fh = fhandle,
2406         };
2407         struct rpc_message msg = {
2408                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2409                 .rpc_argp = &args,
2410                 .rpc_resp = &res,
2411         };
2412
2413         nfs_fattr_init(fattr);
2414
2415         dprintk("NFS call  lookupfh %s\n", name->name);
2416         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2417         dprintk("NFS reply lookupfh: %d\n", status);
2418         return status;
2419 }
2420
2421 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2422                               struct qstr *name, struct nfs_fh *fhandle,
2423                               struct nfs_fattr *fattr)
2424 {
2425         struct nfs4_exception exception = { };
2426         int err;
2427         do {
2428                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2429                 /* FIXME: !!!! */
2430                 if (err == -NFS4ERR_MOVED) {
2431                         err = -EREMOTE;
2432                         break;
2433                 }
2434                 err = nfs4_handle_exception(server, err, &exception);
2435         } while (exception.retry);
2436         return err;
2437 }
2438
2439 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2440                 const struct qstr *name, struct nfs_fh *fhandle,
2441                 struct nfs_fattr *fattr)
2442 {
2443         int status;
2444
2445         dprintk("NFS call  lookup %s\n", name->name);
2446         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2447         if (status == -NFS4ERR_MOVED)
2448                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2449         dprintk("NFS reply lookup: %d\n", status);
2450         return status;
2451 }
2452
2453 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2454 {
2455         memset(fh, 0, sizeof(struct nfs_fh));
2456         fattr->fsid.major = 1;
2457         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2458                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2459         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2460         fattr->nlink = 2;
2461 }
2462
2463 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2464                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2465 {
2466         struct nfs4_exception exception = { };
2467         int err;
2468         do {
2469                 err = nfs4_handle_exception(NFS_SERVER(dir),
2470                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2471                                 &exception);
2472                 if (err == -EPERM)
2473                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2474         } while (exception.retry);
2475         return err;
2476 }
2477
2478 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2479 {
2480         struct nfs_server *server = NFS_SERVER(inode);
2481         struct nfs4_accessargs args = {
2482                 .fh = NFS_FH(inode),
2483                 .bitmask = server->attr_bitmask,
2484         };
2485         struct nfs4_accessres res = {
2486                 .server = server,
2487         };
2488         struct rpc_message msg = {
2489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2490                 .rpc_argp = &args,
2491                 .rpc_resp = &res,
2492                 .rpc_cred = entry->cred,
2493         };
2494         int mode = entry->mask;
2495         int status;
2496
2497         /*
2498          * Determine which access bits we want to ask for...
2499          */
2500         if (mode & MAY_READ)
2501                 args.access |= NFS4_ACCESS_READ;
2502         if (S_ISDIR(inode->i_mode)) {
2503                 if (mode & MAY_WRITE)
2504                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2505                 if (mode & MAY_EXEC)
2506                         args.access |= NFS4_ACCESS_LOOKUP;
2507         } else {
2508                 if (mode & MAY_WRITE)
2509                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2510                 if (mode & MAY_EXEC)
2511                         args.access |= NFS4_ACCESS_EXECUTE;
2512         }
2513
2514         res.fattr = nfs_alloc_fattr();
2515         if (res.fattr == NULL)
2516                 return -ENOMEM;
2517
2518         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2519         if (!status) {
2520                 entry->mask = 0;
2521                 if (res.access & NFS4_ACCESS_READ)
2522                         entry->mask |= MAY_READ;
2523                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2524                         entry->mask |= MAY_WRITE;
2525                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2526                         entry->mask |= MAY_EXEC;
2527                 nfs_refresh_inode(inode, res.fattr);
2528         }
2529         nfs_free_fattr(res.fattr);
2530         return status;
2531 }
2532
2533 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2534 {
2535         struct nfs4_exception exception = { };
2536         int err;
2537         do {
2538                 err = nfs4_handle_exception(NFS_SERVER(inode),
2539                                 _nfs4_proc_access(inode, entry),
2540                                 &exception);
2541         } while (exception.retry);
2542         return err;
2543 }
2544
2545 /*
2546  * TODO: For the time being, we don't try to get any attributes
2547  * along with any of the zero-copy operations READ, READDIR,
2548  * READLINK, WRITE.
2549  *
2550  * In the case of the first three, we want to put the GETATTR
2551  * after the read-type operation -- this is because it is hard
2552  * to predict the length of a GETATTR response in v4, and thus
2553  * align the READ data correctly.  This means that the GETATTR
2554  * may end up partially falling into the page cache, and we should
2555  * shift it into the 'tail' of the xdr_buf before processing.
2556  * To do this efficiently, we need to know the total length
2557  * of data received, which doesn't seem to be available outside
2558  * of the RPC layer.
2559  *
2560  * In the case of WRITE, we also want to put the GETATTR after
2561  * the operation -- in this case because we want to make sure
2562  * we get the post-operation mtime and size.  This means that
2563  * we can't use xdr_encode_pages() as written: we need a variant
2564  * of it which would leave room in the 'tail' iovec.
2565  *
2566  * Both of these changes to the XDR layer would in fact be quite
2567  * minor, but I decided to leave them for a subsequent patch.
2568  */
2569 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2570                 unsigned int pgbase, unsigned int pglen)
2571 {
2572         struct nfs4_readlink args = {
2573                 .fh       = NFS_FH(inode),
2574                 .pgbase   = pgbase,
2575                 .pglen    = pglen,
2576                 .pages    = &page,
2577         };
2578         struct nfs4_readlink_res res;
2579         struct rpc_message msg = {
2580                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2581                 .rpc_argp = &args,
2582                 .rpc_resp = &res,
2583         };
2584
2585         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2586 }
2587
2588 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2589                 unsigned int pgbase, unsigned int pglen)
2590 {
2591         struct nfs4_exception exception = { };
2592         int err;
2593         do {
2594                 err = nfs4_handle_exception(NFS_SERVER(inode),
2595                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2596                                 &exception);
2597         } while (exception.retry);
2598         return err;
2599 }
2600
2601 /*
2602  * Got race?
2603  * We will need to arrange for the VFS layer to provide an atomic open.
2604  * Until then, this create/open method is prone to inefficiency and race
2605  * conditions due to the lookup, create, and open VFS calls from sys_open()
2606  * placed on the wire.
2607  *
2608  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2609  * The file will be opened again in the subsequent VFS open call
2610  * (nfs4_proc_file_open).
2611  *
2612  * The open for read will just hang around to be used by any process that
2613  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2614  */
2615
2616 static int
2617 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2618                  int flags, struct nfs_open_context *ctx)
2619 {
2620         struct dentry *de = dentry;
2621         struct nfs4_state *state;
2622         struct rpc_cred *cred = NULL;
2623         fmode_t fmode = 0;
2624         int status = 0;
2625
2626         if (ctx != NULL) {
2627                 cred = ctx->cred;
2628                 de = ctx->dentry;
2629                 fmode = ctx->mode;
2630         }
2631         sattr->ia_mode &= ~current_umask();
2632         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2633         d_drop(dentry);
2634         if (IS_ERR(state)) {
2635                 status = PTR_ERR(state);
2636                 goto out;
2637         }
2638         d_add(dentry, igrab(state->inode));
2639         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2640         if (ctx != NULL)
2641                 ctx->state = state;
2642         else
2643                 nfs4_close_sync(state, fmode);
2644 out:
2645         return status;
2646 }
2647
2648 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2649 {
2650         struct nfs_server *server = NFS_SERVER(dir);
2651         struct nfs_removeargs args = {
2652                 .fh = NFS_FH(dir),
2653                 .name.len = name->len,
2654                 .name.name = name->name,
2655                 .bitmask = server->attr_bitmask,
2656         };
2657         struct nfs_removeres res = {
2658                 .server = server,
2659         };
2660         struct rpc_message msg = {
2661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2662                 .rpc_argp = &args,
2663                 .rpc_resp = &res,
2664         };
2665         int status = -ENOMEM;
2666
2667         res.dir_attr = nfs_alloc_fattr();
2668         if (res.dir_attr == NULL)
2669                 goto out;
2670
2671         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2672         if (status == 0) {
2673                 update_changeattr(dir, &res.cinfo);
2674                 nfs_post_op_update_inode(dir, res.dir_attr);
2675         }
2676         nfs_free_fattr(res.dir_attr);
2677 out:
2678         return status;
2679 }
2680
2681 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2682 {
2683         struct nfs4_exception exception = { };
2684         int err;
2685         do {
2686                 err = nfs4_handle_exception(NFS_SERVER(dir),
2687                                 _nfs4_proc_remove(dir, name),
2688                                 &exception);
2689         } while (exception.retry);
2690         return err;
2691 }
2692
2693 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2694 {
2695         struct nfs_server *server = NFS_SERVER(dir);
2696         struct nfs_removeargs *args = msg->rpc_argp;
2697         struct nfs_removeres *res = msg->rpc_resp;
2698
2699         args->bitmask = server->cache_consistency_bitmask;
2700         res->server = server;
2701         res->seq_res.sr_slot = NULL;
2702         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2703 }
2704
2705 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2706 {
2707         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2708
2709         if (!nfs4_sequence_done(task, &res->seq_res))
2710                 return 0;
2711         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2712                 return 0;
2713         update_changeattr(dir, &res->cinfo);
2714         nfs_post_op_update_inode(dir, res->dir_attr);
2715         return 1;
2716 }
2717
2718 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2719 {
2720         struct nfs_server *server = NFS_SERVER(dir);
2721         struct nfs_renameargs *arg = msg->rpc_argp;
2722         struct nfs_renameres *res = msg->rpc_resp;
2723
2724         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2725         arg->bitmask = server->attr_bitmask;
2726         res->server = server;
2727 }
2728
2729 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2730                                  struct inode *new_dir)
2731 {
2732         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2733
2734         if (!nfs4_sequence_done(task, &res->seq_res))
2735                 return 0;
2736         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2737                 return 0;
2738
2739         update_changeattr(old_dir, &res->old_cinfo);
2740         nfs_post_op_update_inode(old_dir, res->old_fattr);
2741         update_changeattr(new_dir, &res->new_cinfo);
2742         nfs_post_op_update_inode(new_dir, res->new_fattr);
2743         return 1;
2744 }
2745
2746 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2747                 struct inode *new_dir, struct qstr *new_name)
2748 {
2749         struct nfs_server *server = NFS_SERVER(old_dir);
2750         struct nfs_renameargs arg = {
2751                 .old_dir = NFS_FH(old_dir),
2752                 .new_dir = NFS_FH(new_dir),
2753                 .old_name = old_name,
2754                 .new_name = new_name,
2755                 .bitmask = server->attr_bitmask,
2756         };
2757         struct nfs_renameres res = {
2758                 .server = server,
2759         };
2760         struct rpc_message msg = {
2761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2762                 .rpc_argp = &arg,
2763                 .rpc_resp = &res,
2764         };
2765         int status = -ENOMEM;
2766
2767         res.old_fattr = nfs_alloc_fattr();
2768         res.new_fattr = nfs_alloc_fattr();
2769         if (res.old_fattr == NULL || res.new_fattr == NULL)
2770                 goto out;
2771
2772         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2773         if (!status) {
2774                 update_changeattr(old_dir, &res.old_cinfo);
2775                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2776                 update_changeattr(new_dir, &res.new_cinfo);
2777                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2778         }
2779 out:
2780         nfs_free_fattr(res.new_fattr);
2781         nfs_free_fattr(res.old_fattr);
2782         return status;
2783 }
2784
2785 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2786                 struct inode *new_dir, struct qstr *new_name)
2787 {
2788         struct nfs4_exception exception = { };
2789         int err;
2790         do {
2791                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2792                                 _nfs4_proc_rename(old_dir, old_name,
2793                                         new_dir, new_name),
2794                                 &exception);
2795         } while (exception.retry);
2796         return err;
2797 }
2798
2799 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2800 {
2801         struct nfs_server *server = NFS_SERVER(inode);
2802         struct nfs4_link_arg arg = {
2803                 .fh     = NFS_FH(inode),
2804                 .dir_fh = NFS_FH(dir),
2805                 .name   = name,
2806                 .bitmask = server->attr_bitmask,
2807         };
2808         struct nfs4_link_res res = {
2809                 .server = server,
2810         };
2811         struct rpc_message msg = {
2812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2813                 .rpc_argp = &arg,
2814                 .rpc_resp = &res,
2815         };
2816         int status = -ENOMEM;
2817
2818         res.fattr = nfs_alloc_fattr();
2819         res.dir_attr = nfs_alloc_fattr();
2820         if (res.fattr == NULL || res.dir_attr == NULL)
2821                 goto out;
2822
2823         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2824         if (!status) {
2825                 update_changeattr(dir, &res.cinfo);
2826                 nfs_post_op_update_inode(dir, res.dir_attr);
2827                 nfs_post_op_update_inode(inode, res.fattr);
2828         }
2829 out:
2830         nfs_free_fattr(res.dir_attr);
2831         nfs_free_fattr(res.fattr);
2832         return status;
2833 }
2834
2835 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2836 {
2837         struct nfs4_exception exception = { };
2838         int err;
2839         do {
2840                 err = nfs4_handle_exception(NFS_SERVER(inode),
2841                                 _nfs4_proc_link(inode, dir, name),
2842                                 &exception);
2843         } while (exception.retry);
2844         return err;
2845 }
2846
2847 struct nfs4_createdata {
2848         struct rpc_message msg;
2849         struct nfs4_create_arg arg;
2850         struct nfs4_create_res res;
2851         struct nfs_fh fh;
2852         struct nfs_fattr fattr;
2853         struct nfs_fattr dir_fattr;
2854 };
2855
2856 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2857                 struct qstr *name, struct iattr *sattr, u32 ftype)
2858 {
2859         struct nfs4_createdata *data;
2860
2861         data = kzalloc(sizeof(*data), GFP_KERNEL);
2862         if (data != NULL) {
2863                 struct nfs_server *server = NFS_SERVER(dir);
2864
2865                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2866                 data->msg.rpc_argp = &data->arg;
2867                 data->msg.rpc_resp = &data->res;
2868                 data->arg.dir_fh = NFS_FH(dir);
2869                 data->arg.server = server;
2870                 data->arg.name = name;
2871                 data->arg.attrs = sattr;
2872                 data->arg.ftype = ftype;
2873                 data->arg.bitmask = server->attr_bitmask;
2874                 data->res.server = server;
2875                 data->res.fh = &data->fh;
2876                 data->res.fattr = &data->fattr;
2877                 data->res.dir_fattr = &data->dir_fattr;
2878                 nfs_fattr_init(data->res.fattr);
2879                 nfs_fattr_init(data->res.dir_fattr);
2880         }
2881         return data;
2882 }
2883
2884 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2885 {
2886         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2887                                     &data->arg.seq_args, &data->res.seq_res, 1);
2888         if (status == 0) {
2889                 update_changeattr(dir, &data->res.dir_cinfo);
2890                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2891                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2892         }
2893         return status;
2894 }
2895
2896 static void nfs4_free_createdata(struct nfs4_createdata *data)
2897 {
2898         kfree(data);
2899 }
2900
2901 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2902                 struct page *page, unsigned int len, struct iattr *sattr)
2903 {
2904         struct nfs4_createdata *data;
2905         int status = -ENAMETOOLONG;
2906
2907         if (len > NFS4_MAXPATHLEN)
2908                 goto out;
2909
2910         status = -ENOMEM;
2911         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2912         if (data == NULL)
2913                 goto out;
2914
2915         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2916         data->arg.u.symlink.pages = &page;
2917         data->arg.u.symlink.len = len;
2918
2919         status = nfs4_do_create(dir, dentry, data);
2920
2921         nfs4_free_createdata(data);
2922 out:
2923         return status;
2924 }
2925
2926 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2927                 struct page *page, unsigned int len, struct iattr *sattr)
2928 {
2929         struct nfs4_exception exception = { };
2930         int err;
2931         do {
2932                 err = nfs4_handle_exception(NFS_SERVER(dir),
2933                                 _nfs4_proc_symlink(dir, dentry, page,
2934                                                         len, sattr),
2935                                 &exception);
2936         } while (exception.retry);
2937         return err;
2938 }
2939
2940 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2941                 struct iattr *sattr)
2942 {
2943         struct nfs4_createdata *data;
2944         int status = -ENOMEM;
2945
2946         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2947         if (data == NULL)
2948                 goto out;
2949
2950         status = nfs4_do_create(dir, dentry, data);
2951
2952         nfs4_free_createdata(data);
2953 out:
2954         return status;
2955 }
2956
2957 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2958                 struct iattr *sattr)
2959 {
2960         struct nfs4_exception exception = { };
2961         int err;
2962
2963         sattr->ia_mode &= ~current_umask();
2964         do {
2965                 err = nfs4_handle_exception(NFS_SERVER(dir),
2966                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2967                                 &exception);
2968         } while (exception.retry);
2969         return err;
2970 }
2971
2972 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2973                 u64 cookie, struct page **pages, unsigned int count, int plus)
2974 {
2975         struct inode            *dir = dentry->d_inode;
2976         struct nfs4_readdir_arg args = {
2977                 .fh = NFS_FH(dir),
2978                 .pages = pages,
2979                 .pgbase = 0,
2980                 .count = count,
2981                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2982                 .plus = plus,
2983         };
2984         struct nfs4_readdir_res res;
2985         struct rpc_message msg = {
2986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2987                 .rpc_argp = &args,
2988                 .rpc_resp = &res,
2989                 .rpc_cred = cred,
2990         };
2991         int                     status;
2992
2993         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2994                         dentry->d_parent->d_name.name,
2995                         dentry->d_name.name,
2996                         (unsigned long long)cookie);
2997         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2998         res.pgbase = args.pgbase;
2999         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3000         if (status >= 0) {
3001                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3002                 status += args.pgbase;
3003         }
3004
3005         nfs_invalidate_atime(dir);
3006
3007         dprintk("%s: returns %d\n", __func__, status);
3008         return status;
3009 }
3010
3011 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3012                 u64 cookie, struct page **pages, unsigned int count, int plus)
3013 {
3014         struct nfs4_exception exception = { };
3015         int err;
3016         do {
3017                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3018                                 _nfs4_proc_readdir(dentry, cred, cookie,
3019                                         pages, count, plus),
3020                                 &exception);
3021         } while (exception.retry);
3022         return err;
3023 }
3024
3025 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3026                 struct iattr *sattr, dev_t rdev)
3027 {
3028         struct nfs4_createdata *data;
3029         int mode = sattr->ia_mode;
3030         int status = -ENOMEM;
3031
3032         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3033         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3034
3035         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3036         if (data == NULL)
3037                 goto out;
3038
3039         if (S_ISFIFO(mode))
3040                 data->arg.ftype = NF4FIFO;
3041         else if (S_ISBLK(mode)) {
3042                 data->arg.ftype = NF4BLK;
3043                 data->arg.u.device.specdata1 = MAJOR(rdev);
3044                 data->arg.u.device.specdata2 = MINOR(rdev);
3045         }
3046         else if (S_ISCHR(mode)) {
3047                 data->arg.ftype = NF4CHR;
3048                 data->arg.u.device.specdata1 = MAJOR(rdev);
3049                 data->arg.u.device.specdata2 = MINOR(rdev);
3050         }
3051
3052         status = nfs4_do_create(dir, dentry, data);
3053
3054         nfs4_free_createdata(data);
3055 out:
3056         return status;
3057 }
3058
3059 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3060                 struct iattr *sattr, dev_t rdev)
3061 {
3062         struct nfs4_exception exception = { };
3063         int err;
3064
3065         sattr->ia_mode &= ~current_umask();
3066         do {
3067                 err = nfs4_handle_exception(NFS_SERVER(dir),
3068                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3069                                 &exception);
3070         } while (exception.retry);
3071         return err;
3072 }
3073
3074 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3075                  struct nfs_fsstat *fsstat)
3076 {
3077         struct nfs4_statfs_arg args = {
3078                 .fh = fhandle,
3079                 .bitmask = server->attr_bitmask,
3080         };
3081         struct nfs4_statfs_res res = {
3082                 .fsstat = fsstat,
3083         };
3084         struct rpc_message msg = {
3085                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3086                 .rpc_argp = &args,
3087                 .rpc_resp = &res,
3088         };
3089
3090         nfs_fattr_init(fsstat->fattr);
3091         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3092 }
3093
3094 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3095 {
3096         struct nfs4_exception exception = { };
3097         int err;
3098         do {
3099                 err = nfs4_handle_exception(server,
3100                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3101                                 &exception);
3102         } while (exception.retry);
3103         return err;
3104 }
3105
3106 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3107                 struct nfs_fsinfo *fsinfo)
3108 {
3109         struct nfs4_fsinfo_arg args = {
3110                 .fh = fhandle,
3111                 .bitmask = server->attr_bitmask,
3112         };
3113         struct nfs4_fsinfo_res res = {
3114                 .fsinfo = fsinfo,
3115         };
3116         struct rpc_message msg = {
3117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3118                 .rpc_argp = &args,
3119                 .rpc_resp = &res,
3120         };
3121
3122         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3123 }
3124
3125 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3126 {
3127         struct nfs4_exception exception = { };
3128         int err;
3129
3130         do {
3131                 err = nfs4_handle_exception(server,
3132                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3133                                 &exception);
3134         } while (exception.retry);
3135         return err;
3136 }
3137
3138 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3139 {
3140         nfs_fattr_init(fsinfo->fattr);
3141         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3142 }
3143
3144 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3145                 struct nfs_pathconf *pathconf)
3146 {
3147         struct nfs4_pathconf_arg args = {
3148                 .fh = fhandle,
3149                 .bitmask = server->attr_bitmask,
3150         };
3151         struct nfs4_pathconf_res res = {
3152                 .pathconf = pathconf,
3153         };
3154         struct rpc_message msg = {
3155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3156                 .rpc_argp = &args,
3157                 .rpc_resp = &res,
3158         };
3159
3160         /* None of the pathconf attributes are mandatory to implement */
3161         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3162                 memset(pathconf, 0, sizeof(*pathconf));
3163                 return 0;
3164         }
3165
3166         nfs_fattr_init(pathconf->fattr);
3167         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3168 }
3169
3170 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3171                 struct nfs_pathconf *pathconf)
3172 {
3173         struct nfs4_exception exception = { };
3174         int err;
3175
3176         do {
3177                 err = nfs4_handle_exception(server,
3178                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3179                                 &exception);
3180         } while (exception.retry);
3181         return err;
3182 }
3183
3184 void __nfs4_read_done_cb(struct nfs_read_data *data)
3185 {
3186         nfs_invalidate_atime(data->inode);
3187 }
3188
3189 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3190 {
3191         struct nfs_server *server = NFS_SERVER(data->inode);
3192
3193         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3194                 nfs_restart_rpc(task, server->nfs_client);
3195                 return -EAGAIN;
3196         }
3197
3198         __nfs4_read_done_cb(data);
3199         if (task->tk_status > 0)
3200                 renew_lease(server, data->timestamp);
3201         return 0;
3202 }
3203
3204 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3205 {
3206
3207         dprintk("--> %s\n", __func__);
3208
3209         if (!nfs4_sequence_done(task, &data->res.seq_res))
3210                 return -EAGAIN;
3211
3212         return data->read_done_cb ? data->read_done_cb(task, data) :
3213                                     nfs4_read_done_cb(task, data);
3214 }
3215
3216 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3217 {
3218         data->timestamp   = jiffies;
3219         data->read_done_cb = nfs4_read_done_cb;
3220         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3221 }
3222
3223 /* Reset the the nfs_read_data to send the read to the MDS. */
3224 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3225 {
3226         dprintk("%s Reset task for i/o through\n", __func__);
3227         put_lseg(data->lseg);
3228         data->lseg = NULL;
3229         /* offsets will differ in the dense stripe case */
3230         data->args.offset = data->mds_offset;
3231         data->ds_clp = NULL;
3232         data->args.fh     = NFS_FH(data->inode);
3233         data->read_done_cb = nfs4_read_done_cb;
3234         task->tk_ops = data->mds_ops;
3235         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3236 }
3237 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3238
3239 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3240 {
3241         struct inode *inode = data->inode;
3242
3243         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3244                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3245                 return -EAGAIN;
3246         }
3247         if (task->tk_status >= 0) {
3248                 renew_lease(NFS_SERVER(inode), data->timestamp);
3249                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3250         }
3251         return 0;
3252 }
3253
3254 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3255 {
3256         if (!nfs4_sequence_done(task, &data->res.seq_res))
3257                 return -EAGAIN;
3258         return data->write_done_cb ? data->write_done_cb(task, data) :
3259                 nfs4_write_done_cb(task, data);
3260 }
3261
3262 /* Reset the the nfs_write_data to send the write to the MDS. */
3263 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3264 {
3265         dprintk("%s Reset task for i/o through\n", __func__);
3266         put_lseg(data->lseg);
3267         data->lseg          = NULL;
3268         data->ds_clp        = NULL;
3269         data->write_done_cb = nfs4_write_done_cb;
3270         data->args.fh       = NFS_FH(data->inode);
3271         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3272         data->args.offset   = data->mds_offset;
3273         data->res.fattr     = &data->fattr;
3274         task->tk_ops        = data->mds_ops;
3275         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3276 }
3277 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3278
3279 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3280 {
3281         struct nfs_server *server = NFS_SERVER(data->inode);
3282
3283         if (data->lseg) {
3284                 data->args.bitmask = NULL;
3285                 data->res.fattr = NULL;
3286         } else
3287                 data->args.bitmask = server->cache_consistency_bitmask;
3288         if (!data->write_done_cb)
3289                 data->write_done_cb = nfs4_write_done_cb;
3290         data->res.server = server;
3291         data->timestamp   = jiffies;
3292
3293         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3294 }
3295
3296 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3297 {
3298         struct inode *inode = data->inode;
3299
3300         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3301                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3302                 return -EAGAIN;
3303         }
3304         nfs_refresh_inode(inode, data->res.fattr);
3305         return 0;
3306 }
3307
3308 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3309 {
3310         if (!nfs4_sequence_done(task, &data->res.seq_res))
3311                 return -EAGAIN;
3312         return data->write_done_cb(task, data);
3313 }
3314
3315 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3316 {
3317         struct nfs_server *server = NFS_SERVER(data->inode);
3318
3319         if (data->lseg) {
3320                 data->args.bitmask = NULL;
3321                 data->res.fattr = NULL;
3322         } else
3323                 data->args.bitmask = server->cache_consistency_bitmask;
3324         if (!data->write_done_cb)
3325                 data->write_done_cb = nfs4_commit_done_cb;
3326         data->res.server = server;
3327         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3328 }
3329
3330 struct nfs4_renewdata {
3331         struct nfs_client       *client;
3332         unsigned long           timestamp;
3333 };
3334
3335 /*
3336  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3337  * standalone procedure for queueing an asynchronous RENEW.
3338  */
3339 static void nfs4_renew_release(void *calldata)
3340 {
3341         struct nfs4_renewdata *data = calldata;
3342         struct nfs_client *clp = data->client;
3343
3344         if (atomic_read(&clp->cl_count) > 1)
3345                 nfs4_schedule_state_renewal(clp);
3346         nfs_put_client(clp);
3347         kfree(data);
3348 }
3349
3350 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3351 {
3352         struct nfs4_renewdata *data = calldata;
3353         struct nfs_client *clp = data->client;
3354         unsigned long timestamp = data->timestamp;
3355
3356         if (task->tk_status < 0) {
3357                 /* Unless we're shutting down, schedule state recovery! */
3358                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3359                         nfs4_schedule_lease_recovery(clp);
3360                 return;
3361         }
3362         do_renew_lease(clp, timestamp);
3363 }
3364
3365 static const struct rpc_call_ops nfs4_renew_ops = {
3366         .rpc_call_done = nfs4_renew_done,
3367         .rpc_release = nfs4_renew_release,
3368 };
3369
3370 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3371 {
3372         struct rpc_message msg = {
3373                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3374                 .rpc_argp       = clp,
3375                 .rpc_cred       = cred,
3376         };
3377         struct nfs4_renewdata *data;
3378
3379         if (!atomic_inc_not_zero(&clp->cl_count))
3380                 return -EIO;
3381         data = kmalloc(sizeof(*data), GFP_KERNEL);
3382         if (data == NULL)
3383                 return -ENOMEM;
3384         data->client = clp;
3385         data->timestamp = jiffies;
3386         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3387                         &nfs4_renew_ops, data);
3388 }
3389
3390 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3391 {
3392         struct rpc_message msg = {
3393                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3394                 .rpc_argp       = clp,
3395                 .rpc_cred       = cred,
3396         };
3397         unsigned long now = jiffies;
3398         int status;
3399
3400         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3401         if (status < 0)
3402                 return status;
3403         do_renew_lease(clp, now);
3404         return 0;
3405 }
3406
3407 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3408 {
3409         return (server->caps & NFS_CAP_ACLS)
3410                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3411                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3412 }
3413
3414 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3415  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3416  * the stack.
3417  */
3418 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3419
3420 static void buf_to_pages(const void *buf, size_t buflen,
3421                 struct page **pages, unsigned int *pgbase)
3422 {
3423         const void *p = buf;
3424
3425         *pgbase = offset_in_page(buf);
3426         p -= *pgbase;
3427         while (p < buf + buflen) {
3428                 *(pages++) = virt_to_page(p);
3429                 p += PAGE_CACHE_SIZE;
3430         }
3431 }
3432
3433 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3434                 struct page **pages, unsigned int *pgbase)
3435 {
3436         struct page *newpage, **spages;
3437         int rc = 0;
3438         size_t len;
3439         spages = pages;
3440
3441         do {
3442                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3443                 newpage = alloc_page(GFP_KERNEL);
3444
3445                 if (newpage == NULL)
3446                         goto unwind;
3447                 memcpy(page_address(newpage), buf, len);
3448                 buf += len;
3449                 buflen -= len;
3450                 *pages++ = newpage;
3451                 rc++;
3452         } while (buflen != 0);
3453
3454         return rc;
3455
3456 unwind:
3457         for(; rc > 0; rc--)
3458                 __free_page(spages[rc-1]);
3459         return -ENOMEM;
3460 }
3461
3462 struct nfs4_cached_acl {
3463         int cached;
3464         size_t len;
3465         char data[0];
3466 };
3467
3468 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3469 {
3470         struct nfs_inode *nfsi = NFS_I(inode);
3471
3472         spin_lock(&inode->i_lock);
3473         kfree(nfsi->nfs4_acl);
3474         nfsi->nfs4_acl = acl;
3475         spin_unlock(&inode->i_lock);
3476 }
3477
3478 static void nfs4_zap_acl_attr(struct inode *inode)
3479 {
3480         nfs4_set_cached_acl(inode, NULL);
3481 }
3482
3483 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3484 {
3485         struct nfs_inode *nfsi = NFS_I(inode);
3486         struct nfs4_cached_acl *acl;
3487         int ret = -ENOENT;
3488
3489         spin_lock(&inode->i_lock);
3490         acl = nfsi->nfs4_acl;
3491         if (acl == NULL)
3492                 goto out;
3493         if (buf == NULL) /* user is just asking for length */
3494                 goto out_len;
3495         if (acl->cached == 0)
3496                 goto out;
3497         ret = -ERANGE; /* see getxattr(2) man page */
3498         if (acl->len > buflen)
3499                 goto out;
3500         memcpy(buf, acl->data, acl->len);
3501 out_len:
3502         ret = acl->len;
3503 out:
3504         spin_unlock(&inode->i_lock);
3505         return ret;
3506 }
3507
3508 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3509 {
3510         struct nfs4_cached_acl *acl;
3511
3512         if (buf && acl_len <= PAGE_SIZE) {
3513                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3514                 if (acl == NULL)
3515                         goto out;
3516                 acl->cached = 1;
3517                 memcpy(acl->data, buf, acl_len);
3518         } else {
3519                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3520                 if (acl == NULL)
3521                         goto out;
3522                 acl->cached = 0;
3523         }
3524         acl->len = acl_len;
3525 out:
3526         nfs4_set_cached_acl(inode, acl);
3527 }
3528
3529 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3530 {
3531         struct page *pages[NFS4ACL_MAXPAGES];
3532         struct nfs_getaclargs args = {
3533                 .fh = NFS_FH(inode),
3534                 .acl_pages = pages,
3535                 .acl_len = buflen,
3536         };
3537         struct nfs_getaclres res = {
3538                 .acl_len = buflen,
3539         };
3540         void *resp_buf;
3541         struct rpc_message msg = {
3542                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3543                 .rpc_argp = &args,
3544                 .rpc_resp = &res,
3545         };
3546         struct page *localpage = NULL;
3547         int ret;
3548
3549         if (buflen < PAGE_SIZE) {
3550                 /* As long as we're doing a round trip to the server anyway,
3551                  * let's be prepared for a page of acl data. */
3552                 localpage = alloc_page(GFP_KERNEL);
3553                 resp_buf = page_address(localpage);
3554                 if (localpage == NULL)
3555                         return -ENOMEM;
3556                 args.acl_pages[0] = localpage;
3557                 args.acl_pgbase = 0;
3558                 args.acl_len = PAGE_SIZE;
3559         } else {
3560                 resp_buf = buf;
3561                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3562         }
3563         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3564         if (ret)
3565                 goto out_free;
3566         if (res.acl_len > args.acl_len)
3567                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3568         else
3569                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3570         if (buf) {
3571                 ret = -ERANGE;
3572                 if (res.acl_len > buflen)
3573                         goto out_free;
3574                 if (localpage)
3575                         memcpy(buf, resp_buf, res.acl_len);
3576         }
3577         ret = res.acl_len;
3578 out_free:
3579         if (localpage)
3580                 __free_page(localpage);
3581         return ret;
3582 }
3583
3584 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3585 {
3586         struct nfs4_exception exception = { };
3587         ssize_t ret;
3588         do {
3589                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3590                 if (ret >= 0)
3591                         break;
3592                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3593         } while (exception.retry);
3594         return ret;
3595 }
3596
3597 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3598 {
3599         struct nfs_server *server = NFS_SERVER(inode);
3600         int ret;
3601
3602         if (!nfs4_server_supports_acls(server))
3603                 return -EOPNOTSUPP;
3604         ret = nfs_revalidate_inode(server, inode);
3605         if (ret < 0)
3606                 return ret;
3607         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3608                 nfs_zap_acl_cache(inode);
3609         ret = nfs4_read_cached_acl(inode, buf, buflen);
3610         if (ret != -ENOENT)
3611                 return ret;
3612         return nfs4_get_acl_uncached(inode, buf, buflen);
3613 }
3614
3615 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3616 {
3617         struct nfs_server *server = NFS_SERVER(inode);
3618         struct page *pages[NFS4ACL_MAXPAGES];
3619         struct nfs_setaclargs arg = {
3620                 .fh             = NFS_FH(inode),
3621                 .acl_pages      = pages,
3622                 .acl_len        = buflen,
3623         };
3624         struct nfs_setaclres res;
3625         struct rpc_message msg = {
3626                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3627                 .rpc_argp       = &arg,
3628                 .rpc_resp       = &res,
3629         };
3630         int ret, i;
3631
3632         if (!nfs4_server_supports_acls(server))
3633                 return -EOPNOTSUPP;
3634         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3635         if (i < 0)
3636                 return i;
3637         nfs_inode_return_delegation(inode);
3638         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3639
3640         /*
3641          * Free each page after tx, so the only ref left is
3642          * held by the network stack
3643          */
3644         for (; i > 0; i--)
3645                 put_page(pages[i-1]);
3646
3647         /*
3648          * Acl update can result in inode attribute update.
3649          * so mark the attribute cache invalid.
3650          */
3651         spin_lock(&inode->i_lock);
3652         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3653         spin_unlock(&inode->i_lock);
3654         nfs_access_zap_cache(inode);
3655         nfs_zap_acl_cache(inode);
3656         return ret;
3657 }
3658
3659 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3660 {
3661         struct nfs4_exception exception = { };
3662         int err;
3663         do {
3664                 err = nfs4_handle_exception(NFS_SERVER(inode),
3665                                 __nfs4_proc_set_acl(inode, buf, buflen),
3666                                 &exception);
3667         } while (exception.retry);
3668         return err;
3669 }
3670
3671 static int
3672 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3673 {
3674         struct nfs_client *clp = server->nfs_client;
3675
3676         if (task->tk_status >= 0)
3677                 return 0;
3678         switch(task->tk_status) {
3679                 case -NFS4ERR_ADMIN_REVOKED:
3680                 case -NFS4ERR_BAD_STATEID:
3681                 case -NFS4ERR_OPENMODE:
3682                         if (state == NULL)
3683                                 break;
3684                         nfs4_schedule_stateid_recovery(server, state);
3685                         goto wait_on_recovery;
3686                 case -NFS4ERR_EXPIRED:
3687                         if (state != NULL)
3688                                 nfs4_schedule_stateid_recovery(server, state);
3689                 case -NFS4ERR_STALE_STATEID:
3690                 case -NFS4ERR_STALE_CLIENTID:
3691                         nfs4_schedule_lease_recovery(clp);
3692                         goto wait_on_recovery;
3693 #if defined(CONFIG_NFS_V4_1)
3694                 case -NFS4ERR_BADSESSION:
3695                 case -NFS4ERR_BADSLOT:
3696                 case -NFS4ERR_BAD_HIGH_SLOT:
3697                 case -NFS4ERR_DEADSESSION:
3698                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3699                 case -NFS4ERR_SEQ_FALSE_RETRY:
3700                 case -NFS4ERR_SEQ_MISORDERED:
3701                         dprintk("%s ERROR %d, Reset session\n", __func__,
3702                                 task->tk_status);
3703                         nfs4_schedule_session_recovery(clp->cl_session);
3704                         task->tk_status = 0;
3705                         return -EAGAIN;
3706 #endif /* CONFIG_NFS_V4_1 */
3707                 case -NFS4ERR_DELAY:
3708                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3709                 case -NFS4ERR_GRACE:
3710                 case -EKEYEXPIRED:
3711                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3712                         task->tk_status = 0;
3713                         return -EAGAIN;
3714                 case -NFS4ERR_RETRY_UNCACHED_REP:
3715                 case -NFS4ERR_OLD_STATEID:
3716                         task->tk_status = 0;
3717                         return -EAGAIN;
3718         }
3719         task->tk_status = nfs4_map_errors(task->tk_status);
3720         return 0;
3721 wait_on_recovery:
3722         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3723         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3724                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3725         task->tk_status = 0;
3726         return -EAGAIN;
3727 }
3728
3729 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3730                 unsigned short port, struct rpc_cred *cred,
3731                 struct nfs4_setclientid_res *res)
3732 {
3733         nfs4_verifier sc_verifier;
3734         struct nfs4_setclientid setclientid = {
3735                 .sc_verifier = &sc_verifier,
3736                 .sc_prog = program,
3737                 .sc_cb_ident = clp->cl_cb_ident,
3738         };
3739         struct rpc_message msg = {
3740                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3741                 .rpc_argp = &setclientid,
3742                 .rpc_resp = res,
3743                 .rpc_cred = cred,
3744         };
3745         __be32 *p;
3746         int loop = 0;
3747         int status;
3748
3749         p = (__be32*)sc_verifier.data;
3750         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3751         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3752
3753         for(;;) {
3754                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3755                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3756                                 clp->cl_ipaddr,
3757                                 rpc_peeraddr2str(clp->cl_rpcclient,
3758                                                         RPC_DISPLAY_ADDR),
3759                                 rpc_peeraddr2str(clp->cl_rpcclient,
3760                                                         RPC_DISPLAY_PROTO),
3761                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3762                                 clp->cl_id_uniquifier);
3763                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3764                                 sizeof(setclientid.sc_netid),
3765                                 rpc_peeraddr2str(clp->cl_rpcclient,
3766                                                         RPC_DISPLAY_NETID));
3767                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3768                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3769                                 clp->cl_ipaddr, port >> 8, port & 255);
3770
3771                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3772                 if (status != -NFS4ERR_CLID_INUSE)
3773                         break;
3774                 if (loop != 0) {
3775                         ++clp->cl_id_uniquifier;
3776                         break;
3777                 }
3778                 ++loop;
3779                 ssleep(clp->cl_lease_time / HZ + 1);
3780         }
3781         return status;
3782 }
3783
3784 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3785                 struct nfs4_setclientid_res *arg,
3786                 struct rpc_cred *cred)
3787 {
3788         struct nfs_fsinfo fsinfo;
3789         struct rpc_message msg = {
3790                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3791                 .rpc_argp = arg,
3792                 .rpc_resp = &fsinfo,
3793                 .rpc_cred = cred,
3794         };
3795         unsigned long now;
3796         int status;
3797
3798         now = jiffies;
3799         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3800         if (status == 0) {
3801                 spin_lock(&clp->cl_lock);
3802                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3803                 clp->cl_last_renewal = now;
3804                 spin_unlock(&clp->cl_lock);
3805         }
3806         return status;
3807 }
3808
3809 struct nfs4_delegreturndata {
3810         struct nfs4_delegreturnargs args;
3811         struct nfs4_delegreturnres res;
3812         struct nfs_fh fh;
3813         nfs4_stateid stateid;
3814         unsigned long timestamp;
3815         struct nfs_fattr fattr;
3816         int rpc_status;
3817 };
3818
3819 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3820 {
3821         struct nfs4_delegreturndata *data = calldata;
3822
3823         if (!nfs4_sequence_done(task, &data->res.seq_res))
3824                 return;
3825
3826         switch (task->tk_status) {
3827         case -NFS4ERR_STALE_STATEID:
3828         case -NFS4ERR_EXPIRED:
3829         case 0:
3830                 renew_lease(data->res.server, data->timestamp);
3831                 break;
3832         default:
3833                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3834                                 -EAGAIN) {
3835                         nfs_restart_rpc(task, data->res.server->nfs_client);
3836                         return;
3837                 }
3838         }
3839         data->rpc_status = task->tk_status;
3840 }
3841
3842 static void nfs4_delegreturn_release(void *calldata)
3843 {
3844         kfree(calldata);
3845 }
3846
3847 #if defined(CONFIG_NFS_V4_1)
3848 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3849 {
3850         struct nfs4_delegreturndata *d_data;
3851
3852         d_data = (struct nfs4_delegreturndata *)data;
3853
3854         if (nfs4_setup_sequence(d_data->res.server,
3855                                 &d_data->args.seq_args,
3856                                 &d_data->res.seq_res, 1, task))
3857                 return;
3858         rpc_call_start(task);
3859 }
3860 #endif /* CONFIG_NFS_V4_1 */
3861
3862 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3863 #if defined(CONFIG_NFS_V4_1)
3864         .rpc_call_prepare = nfs4_delegreturn_prepare,
3865 #endif /* CONFIG_NFS_V4_1 */
3866         .rpc_call_done = nfs4_delegreturn_done,
3867         .rpc_release = nfs4_delegreturn_release,
3868 };
3869
3870 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3871 {
3872         struct nfs4_delegreturndata *data;
3873         struct nfs_server *server = NFS_SERVER(inode);
3874         struct rpc_task *task;
3875         struct rpc_message msg = {
3876                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3877                 .rpc_cred = cred,
3878         };
3879         struct rpc_task_setup task_setup_data = {
3880                 .rpc_client = server->client,
3881                 .rpc_message = &msg,
3882                 .callback_ops = &nfs4_delegreturn_ops,
3883                 .flags = RPC_TASK_ASYNC,
3884         };
3885         int status = 0;
3886
3887         data = kzalloc(sizeof(*data), GFP_NOFS);
3888         if (data == NULL)
3889                 return -ENOMEM;
3890         data->args.fhandle = &data->fh;
3891         data->args.stateid = &data->stateid;
3892         data->args.bitmask = server->attr_bitmask;
3893         nfs_copy_fh(&data->fh, NFS_FH(inode));
3894         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3895         data->res.fattr = &data->fattr;
3896         data->res.server = server;
3897         nfs_fattr_init(data->res.fattr);
3898         data->timestamp = jiffies;
3899         data->rpc_status = 0;
3900
3901         task_setup_data.callback_data = data;
3902         msg.rpc_argp = &data->args;
3903         msg.rpc_resp = &data->res;
3904         task = rpc_run_task(&task_setup_data);
3905         if (IS_ERR(task))
3906                 return PTR_ERR(task);
3907         if (!issync)
3908                 goto out;
3909         status = nfs4_wait_for_completion_rpc_task(task);
3910         if (status != 0)
3911                 goto out;
3912         status = data->rpc_status;
3913         if (status != 0)
3914                 goto out;
3915         nfs_refresh_inode(inode, &data->fattr);
3916 out:
3917         rpc_put_task(task);
3918         return status;
3919 }
3920
3921 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3922 {
3923         struct nfs_server *server = NFS_SERVER(inode);
3924         struct nfs4_exception exception = { };
3925         int err;
3926         do {
3927                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3928                 switch (err) {
3929                         case -NFS4ERR_STALE_STATEID:
3930                         case -NFS4ERR_EXPIRED:
3931                         case 0:
3932                                 return 0;
3933                 }
3934                 err = nfs4_handle_exception(server, err, &exception);
3935         } while (exception.retry);
3936         return err;
3937 }
3938
3939 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3940 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3941
3942 /*
3943  * sleep, with exponential backoff, and retry the LOCK operation.
3944  */
3945 static unsigned long
3946 nfs4_set_lock_task_retry(unsigned long timeout)
3947 {
3948         schedule_timeout_killable(timeout);
3949         timeout <<= 1;
3950         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3951                 return NFS4_LOCK_MAXTIMEOUT;
3952         return timeout;
3953 }
3954
3955 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3956 {
3957         struct inode *inode = state->inode;
3958         struct nfs_server *server = NFS_SERVER(inode);
3959         struct nfs_client *clp = server->nfs_client;
3960         struct nfs_lockt_args arg = {
3961                 .fh = NFS_FH(inode),
3962                 .fl = request,
3963         };
3964         struct nfs_lockt_res res = {
3965                 .denied = request,
3966         };
3967         struct rpc_message msg = {
3968                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3969                 .rpc_argp       = &arg,
3970                 .rpc_resp       = &res,
3971                 .rpc_cred       = state->owner->so_cred,
3972         };
3973         struct nfs4_lock_state *lsp;
3974         int status;
3975
3976         arg.lock_owner.clientid = clp->cl_clientid;
3977         status = nfs4_set_lock_state(state, request);
3978         if (status != 0)
3979                 goto out;
3980         lsp = request->fl_u.nfs4_fl.owner;
3981         arg.lock_owner.id = lsp->ls_id.id;
3982         arg.lock_owner.s_dev = server->s_dev;
3983         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3984         switch (status) {
3985                 case 0:
3986                         request->fl_type = F_UNLCK;
3987                         break;
3988                 case -NFS4ERR_DENIED:
3989                         status = 0;
3990         }
3991         request->fl_ops->fl_release_private(request);
3992 out:
3993         return status;
3994 }
3995
3996 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3997 {
3998         struct nfs4_exception exception = { };
3999         int err;
4000
4001         do {
4002                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4003                                 _nfs4_proc_getlk(state, cmd, request),
4004                                 &exception);
4005         } while (exception.retry);
4006         return err;
4007 }
4008
4009 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4010 {
4011         int res = 0;
4012         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4013                 case FL_POSIX:
4014                         res = posix_lock_file_wait(file, fl);
4015                         break;
4016                 case FL_FLOCK:
4017                         res = flock_lock_file_wait(file, fl);
4018                         break;
4019                 default:
4020                         BUG();
4021         }
4022         return res;
4023 }
4024
4025 struct nfs4_unlockdata {
4026         struct nfs_locku_args arg;
4027         struct nfs_locku_res res;
4028         struct nfs4_lock_state *lsp;
4029         struct nfs_open_context *ctx;
4030         struct file_lock fl;
4031         const struct nfs_server *server;
4032         unsigned long timestamp;
4033 };
4034
4035 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4036                 struct nfs_open_context *ctx,
4037                 struct nfs4_lock_state *lsp,
4038                 struct nfs_seqid *seqid)
4039 {
4040         struct nfs4_unlockdata *p;
4041         struct inode *inode = lsp->ls_state->inode;
4042
4043         p = kzalloc(sizeof(*p), GFP_NOFS);
4044         if (p == NULL)
4045                 return NULL;
4046         p->arg.fh = NFS_FH(inode);
4047         p->arg.fl = &p->fl;
4048         p->arg.seqid = seqid;
4049         p->res.seqid = seqid;
4050         p->arg.stateid = &lsp->ls_stateid;
4051         p->lsp = lsp;
4052         atomic_inc(&lsp->ls_count);
4053         /* Ensure we don't close file until we're done freeing locks! */
4054         p->ctx = get_nfs_open_context(ctx);
4055         memcpy(&p->fl, fl, sizeof(p->fl));
4056         p->server = NFS_SERVER(inode);
4057         return p;
4058 }
4059
4060 static void nfs4_locku_release_calldata(void *data)
4061 {
4062         struct nfs4_unlockdata *calldata = data;
4063         nfs_free_seqid(calldata->arg.seqid);
4064         nfs4_put_lock_state(calldata->lsp);
4065         put_nfs_open_context(calldata->ctx);
4066         kfree(calldata);
4067 }
4068
4069 static void nfs4_locku_done(struct rpc_task *task, void *data)
4070 {
4071         struct nfs4_unlockdata *calldata = data;
4072
4073         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4074                 return;
4075         switch (task->tk_status) {
4076                 case 0:
4077                         memcpy(calldata->lsp->ls_stateid.data,
4078                                         calldata->res.stateid.data,
4079                                         sizeof(calldata->lsp->ls_stateid.data));
4080                         renew_lease(calldata->server, calldata->timestamp);
4081                         break;
4082                 case -NFS4ERR_BAD_STATEID:
4083                 case -NFS4ERR_OLD_STATEID:
4084                 case -NFS4ERR_STALE_STATEID:
4085                 case -NFS4ERR_EXPIRED:
4086                         break;
4087                 default:
4088                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4089                                 nfs_restart_rpc(task,
4090                                                  calldata->server->nfs_client);
4091         }
4092 }
4093
4094 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4095 {
4096         struct nfs4_unlockdata *calldata = data;
4097
4098         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4099                 return;
4100         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4101                 /* Note: exit _without_ running nfs4_locku_done */
4102                 task->tk_action = NULL;
4103                 return;
4104         }
4105         calldata->timestamp = jiffies;
4106         if (nfs4_setup_sequence(calldata->server,
4107                                 &calldata->arg.seq_args,
4108                                 &calldata->res.seq_res, 1, task))
4109                 return;
4110         rpc_call_start(task);
4111 }
4112
4113 static const struct rpc_call_ops nfs4_locku_ops = {
4114         .rpc_call_prepare = nfs4_locku_prepare,
4115         .rpc_call_done = nfs4_locku_done,
4116         .rpc_release = nfs4_locku_release_calldata,
4117 };
4118
4119 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4120                 struct nfs_open_context *ctx,
4121                 struct nfs4_lock_state *lsp,
4122                 struct nfs_seqid *seqid)
4123 {
4124         struct nfs4_unlockdata *data;
4125         struct rpc_message msg = {
4126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4127                 .rpc_cred = ctx->cred,
4128         };
4129         struct rpc_task_setup task_setup_data = {
4130                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4131                 .rpc_message = &msg,
4132                 .callback_ops = &nfs4_locku_ops,
4133                 .workqueue = nfsiod_workqueue,
4134                 .flags = RPC_TASK_ASYNC,
4135         };
4136
4137         /* Ensure this is an unlock - when canceling a lock, the
4138          * canceled lock is passed in, and it won't be an unlock.
4139          */
4140         fl->fl_type = F_UNLCK;
4141
4142         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4143         if (data == NULL) {
4144                 nfs_free_seqid(seqid);
4145                 return ERR_PTR(-ENOMEM);
4146         }
4147
4148         msg.rpc_argp = &data->arg;
4149         msg.rpc_resp = &data->res;
4150         task_setup_data.callback_data = data;
4151         return rpc_run_task(&task_setup_data);
4152 }
4153
4154 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4155 {
4156         struct nfs_inode *nfsi = NFS_I(state->inode);
4157         struct nfs_seqid *seqid;
4158         struct nfs4_lock_state *lsp;
4159         struct rpc_task *task;
4160         int status = 0;
4161         unsigned char fl_flags = request->fl_flags;
4162
4163         status = nfs4_set_lock_state(state, request);
4164         /* Unlock _before_ we do the RPC call */
4165         request->fl_flags |= FL_EXISTS;
4166         down_read(&nfsi->rwsem);
4167         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4168                 up_read(&nfsi->rwsem);
4169                 goto out;
4170         }
4171         up_read(&nfsi->rwsem);
4172         if (status != 0)
4173                 goto out;
4174         /* Is this a delegated lock? */
4175         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4176                 goto out;
4177         lsp = request->fl_u.nfs4_fl.owner;
4178         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4179         status = -ENOMEM;
4180         if (seqid == NULL)
4181                 goto out;
4182         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4183         status = PTR_ERR(task);
4184         if (IS_ERR(task))
4185                 goto out;
4186         status = nfs4_wait_for_completion_rpc_task(task);
4187         rpc_put_task(task);
4188 out:
4189         request->fl_flags = fl_flags;
4190         return status;
4191 }
4192
4193 struct nfs4_lockdata {
4194         struct nfs_lock_args arg;
4195         struct nfs_lock_res res;
4196         struct nfs4_lock_state *lsp;
4197         struct nfs_open_context *ctx;
4198         struct file_lock fl;
4199         unsigned long timestamp;
4200         int rpc_status;
4201         int cancelled;
4202         struct nfs_server *server;
4203 };
4204
4205 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4206                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4207                 gfp_t gfp_mask)
4208 {
4209         struct nfs4_lockdata *p;
4210         struct inode *inode = lsp->ls_state->inode;
4211         struct nfs_server *server = NFS_SERVER(inode);
4212
4213         p = kzalloc(sizeof(*p), gfp_mask);
4214         if (p == NULL)
4215                 return NULL;
4216
4217         p->arg.fh = NFS_FH(inode);
4218         p->arg.fl = &p->fl;
4219         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4220         if (p->arg.open_seqid == NULL)
4221                 goto out_free;
4222         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4223         if (p->arg.lock_seqid == NULL)
4224                 goto out_free_seqid;
4225         p->arg.lock_stateid = &lsp->ls_stateid;
4226         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4227         p->arg.lock_owner.id = lsp->ls_id.id;
4228         p->arg.lock_owner.s_dev = server->s_dev;
4229         p->res.lock_seqid = p->arg.lock_seqid;
4230         p->lsp = lsp;
4231         p->server = server;
4232         atomic_inc(&lsp->ls_count);
4233         p->ctx = get_nfs_open_context(ctx);
4234         memcpy(&p->fl, fl, sizeof(p->fl));
4235         return p;
4236 out_free_seqid:
4237         nfs_free_seqid(p->arg.open_seqid);
4238 out_free:
4239         kfree(p);
4240         return NULL;
4241 }
4242
4243 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4244 {
4245         struct nfs4_lockdata *data = calldata;
4246         struct nfs4_state *state = data->lsp->ls_state;
4247
4248         dprintk("%s: begin!\n", __func__);
4249         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4250                 return;
4251         /* Do we need to do an open_to_lock_owner? */
4252         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4253                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4254                         return;
4255                 data->arg.open_stateid = &state->stateid;
4256                 data->arg.new_lock_owner = 1;
4257                 data->res.open_seqid = data->arg.open_seqid;
4258         } else
4259                 data->arg.new_lock_owner = 0;
4260         data->timestamp = jiffies;
4261         if (nfs4_setup_sequence(data->server,
4262                                 &data->arg.seq_args,
4263                                 &data->res.seq_res, 1, task))
4264                 return;
4265         rpc_call_start(task);
4266         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4267 }
4268
4269 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4270 {
4271         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4272         nfs4_lock_prepare(task, calldata);
4273 }
4274
4275 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4276 {
4277         struct nfs4_lockdata *data = calldata;
4278
4279         dprintk("%s: begin!\n", __func__);
4280
4281         if (!nfs4_sequence_done(task, &data->res.seq_res))
4282                 return;
4283
4284         data->rpc_status = task->tk_status;
4285         if (data->arg.new_lock_owner != 0) {
4286                 if (data->rpc_status == 0)
4287                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4288                 else
4289                         goto out;
4290         }
4291         if (data->rpc_status == 0) {
4292                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4293                                         sizeof(data->lsp->ls_stateid.data));
4294                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4295                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4296         }
4297 out:
4298         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4299 }
4300
4301 static void nfs4_lock_release(void *calldata)
4302 {
4303         struct nfs4_lockdata *data = calldata;
4304
4305         dprintk("%s: begin!\n", __func__);
4306         nfs_free_seqid(data->arg.open_seqid);
4307         if (data->cancelled != 0) {
4308                 struct rpc_task *task;
4309                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4310                                 data->arg.lock_seqid);
4311                 if (!IS_ERR(task))
4312                         rpc_put_task_async(task);
4313                 dprintk("%s: cancelling lock!\n", __func__);
4314         } else
4315                 nfs_free_seqid(data->arg.lock_seqid);
4316         nfs4_put_lock_state(data->lsp);
4317         put_nfs_open_context(data->ctx);
4318         kfree(data);
4319         dprintk("%s: done!\n", __func__);
4320 }
4321
4322 static const struct rpc_call_ops nfs4_lock_ops = {
4323         .rpc_call_prepare = nfs4_lock_prepare,
4324         .rpc_call_done = nfs4_lock_done,
4325         .rpc_release = nfs4_lock_release,
4326 };
4327
4328 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4329         .rpc_call_prepare = nfs4_recover_lock_prepare,
4330         .rpc_call_done = nfs4_lock_done,
4331         .rpc_release = nfs4_lock_release,
4332 };
4333
4334 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4335 {
4336         switch (error) {
4337         case -NFS4ERR_ADMIN_REVOKED:
4338         case -NFS4ERR_BAD_STATEID:
4339                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4340                 if (new_lock_owner != 0 ||
4341                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4342                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4343                 break;
4344         case -NFS4ERR_STALE_STATEID:
4345                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4346         case -NFS4ERR_EXPIRED:
4347                 nfs4_schedule_lease_recovery(server->nfs_client);
4348         };
4349 }
4350
4351 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4352 {
4353         struct nfs4_lockdata *data;
4354         struct rpc_task *task;
4355         struct rpc_message msg = {
4356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4357                 .rpc_cred = state->owner->so_cred,
4358         };
4359         struct rpc_task_setup task_setup_data = {
4360                 .rpc_client = NFS_CLIENT(state->inode),
4361                 .rpc_message = &msg,
4362                 .callback_ops = &nfs4_lock_ops,
4363                 .workqueue = nfsiod_workqueue,
4364                 .flags = RPC_TASK_ASYNC,
4365         };
4366         int ret;
4367
4368         dprintk("%s: begin!\n", __func__);
4369         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4370                         fl->fl_u.nfs4_fl.owner,
4371                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4372         if (data == NULL)
4373                 return -ENOMEM;
4374         if (IS_SETLKW(cmd))
4375                 data->arg.block = 1;
4376         if (recovery_type > NFS_LOCK_NEW) {
4377                 if (recovery_type == NFS_LOCK_RECLAIM)
4378                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4379                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4380         }
4381         msg.rpc_argp = &data->arg;
4382         msg.rpc_resp = &data->res;
4383         task_setup_data.callback_data = data;
4384         task = rpc_run_task(&task_setup_data);
4385         if (IS_ERR(task))
4386                 return PTR_ERR(task);
4387         ret = nfs4_wait_for_completion_rpc_task(task);
4388         if (ret == 0) {
4389                 ret = data->rpc_status;
4390                 if (ret)
4391                         nfs4_handle_setlk_error(data->server, data->lsp,
4392                                         data->arg.new_lock_owner, ret);
4393         } else
4394                 data->cancelled = 1;
4395         rpc_put_task(task);
4396         dprintk("%s: done, ret = %d!\n", __func__, ret);
4397         return ret;
4398 }
4399
4400 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4401 {
4402         struct nfs_server *server = NFS_SERVER(state->inode);
4403         struct nfs4_exception exception = { };
4404         int err;
4405
4406         do {
4407                 /* Cache the lock if possible... */
4408                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4409                         return 0;
4410                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4411                 if (err != -NFS4ERR_DELAY)
4412                         break;
4413                 nfs4_handle_exception(server, err, &exception);
4414         } while (exception.retry);
4415         return err;
4416 }
4417
4418 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4419 {
4420         struct nfs_server *server = NFS_SERVER(state->inode);
4421         struct nfs4_exception exception = { };
4422         int err;
4423
4424         err = nfs4_set_lock_state(state, request);
4425         if (err != 0)
4426                 return err;
4427         do {
4428                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4429                         return 0;
4430                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4431                 switch (err) {
4432                 default:
4433                         goto out;
4434                 case -NFS4ERR_GRACE:
4435                 case -NFS4ERR_DELAY:
4436                         nfs4_handle_exception(server, err, &exception);
4437                         err = 0;
4438                 }
4439         } while (exception.retry);
4440 out:
4441         return err;
4442 }
4443
4444 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4445 {
4446         struct nfs_inode *nfsi = NFS_I(state->inode);
4447         unsigned char fl_flags = request->fl_flags;
4448         int status = -ENOLCK;
4449
4450         if ((fl_flags & FL_POSIX) &&
4451                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4452                 goto out;
4453         /* Is this a delegated open? */
4454         status = nfs4_set_lock_state(state, request);
4455         if (status != 0)
4456                 goto out;
4457         request->fl_flags |= FL_ACCESS;
4458         status = do_vfs_lock(request->fl_file, request);
4459         if (status < 0)
4460                 goto out;
4461         down_read(&nfsi->rwsem);
4462         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4463                 /* Yes: cache locks! */
4464                 /* ...but avoid races with delegation recall... */
4465                 request->fl_flags = fl_flags & ~FL_SLEEP;
4466                 status = do_vfs_lock(request->fl_file, request);
4467                 goto out_unlock;
4468         }
4469         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4470         if (status != 0)
4471                 goto out_unlock;
4472         /* Note: we always want to sleep here! */
4473         request->fl_flags = fl_flags | FL_SLEEP;
4474         if (do_vfs_lock(request->fl_file, request) < 0)
4475                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4476 out_unlock:
4477         up_read(&nfsi->rwsem);
4478 out:
4479         request->fl_flags = fl_flags;
4480         return status;
4481 }
4482
4483 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4484 {
4485         struct nfs4_exception exception = { };
4486         int err;
4487
4488         do {
4489                 err = _nfs4_proc_setlk(state, cmd, request);
4490                 if (err == -NFS4ERR_DENIED)
4491                         err = -EAGAIN;
4492                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4493                                 err, &exception);
4494         } while (exception.retry);
4495         return err;
4496 }
4497
4498 static int
4499 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4500 {
4501         struct nfs_open_context *ctx;
4502         struct nfs4_state *state;
4503         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4504         int status;
4505
4506         /* verify open state */
4507         ctx = nfs_file_open_context(filp);
4508         state = ctx->state;
4509
4510         if (request->fl_start < 0 || request->fl_end < 0)
4511                 return -EINVAL;
4512
4513         if (IS_GETLK(cmd)) {
4514                 if (state != NULL)
4515                         return nfs4_proc_getlk(state, F_GETLK, request);
4516                 return 0;
4517         }
4518
4519         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4520                 return -EINVAL;
4521
4522         if (request->fl_type == F_UNLCK) {
4523                 if (state != NULL)
4524                         return nfs4_proc_unlck(state, cmd, request);
4525                 return 0;
4526         }
4527
4528         if (state == NULL)
4529                 return -ENOLCK;
4530         do {
4531                 status = nfs4_proc_setlk(state, cmd, request);
4532                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4533                         break;
4534                 timeout = nfs4_set_lock_task_retry(timeout);
4535                 status = -ERESTARTSYS;
4536                 if (signalled())
4537                         break;
4538         } while(status < 0);
4539         return status;
4540 }
4541
4542 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4543 {
4544         struct nfs_server *server = NFS_SERVER(state->inode);
4545         struct nfs4_exception exception = { };
4546         int err;
4547
4548         err = nfs4_set_lock_state(state, fl);
4549         if (err != 0)
4550                 goto out;
4551         do {
4552                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4553                 switch (err) {
4554                         default:
4555                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4556                                                 __func__, err);
4557                         case 0:
4558                         case -ESTALE:
4559                                 goto out;
4560                         case -NFS4ERR_EXPIRED:
4561                                 nfs4_schedule_stateid_recovery(server, state);
4562                         case -NFS4ERR_STALE_CLIENTID:
4563                         case -NFS4ERR_STALE_STATEID:
4564                                 nfs4_schedule_lease_recovery(server->nfs_client);
4565                                 goto out;
4566                         case -NFS4ERR_BADSESSION:
4567                         case -NFS4ERR_BADSLOT:
4568                         case -NFS4ERR_BAD_HIGH_SLOT:
4569                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4570                         case -NFS4ERR_DEADSESSION:
4571                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4572                                 goto out;
4573                         case -ERESTARTSYS:
4574                                 /*
4575                                  * The show must go on: exit, but mark the
4576                                  * stateid as needing recovery.
4577                                  */
4578                         case -NFS4ERR_ADMIN_REVOKED:
4579                         case -NFS4ERR_BAD_STATEID:
4580                         case -NFS4ERR_OPENMODE:
4581                                 nfs4_schedule_stateid_recovery(server, state);
4582                                 err = 0;
4583                                 goto out;
4584                         case -EKEYEXPIRED:
4585                                 /*
4586                                  * User RPCSEC_GSS context has expired.
4587                                  * We cannot recover this stateid now, so
4588                                  * skip it and allow recovery thread to
4589                                  * proceed.
4590                                  */
4591                                 err = 0;
4592                                 goto out;
4593                         case -ENOMEM:
4594                         case -NFS4ERR_DENIED:
4595                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4596                                 err = 0;
4597                                 goto out;
4598                         case -NFS4ERR_DELAY:
4599                                 break;
4600                 }
4601                 err = nfs4_handle_exception(server, err, &exception);
4602         } while (exception.retry);
4603 out:
4604         return err;
4605 }
4606
4607 static void nfs4_release_lockowner_release(void *calldata)
4608 {
4609         kfree(calldata);
4610 }
4611
4612 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4613         .rpc_release = nfs4_release_lockowner_release,
4614 };
4615
4616 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4617 {
4618         struct nfs_server *server = lsp->ls_state->owner->so_server;
4619         struct nfs_release_lockowner_args *args;
4620         struct rpc_message msg = {
4621                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4622         };
4623
4624         if (server->nfs_client->cl_mvops->minor_version != 0)
4625                 return;
4626         args = kmalloc(sizeof(*args), GFP_NOFS);
4627         if (!args)
4628                 return;
4629         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4630         args->lock_owner.id = lsp->ls_id.id;
4631         args->lock_owner.s_dev = server->s_dev;
4632         msg.rpc_argp = args;
4633         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4634 }
4635
4636 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4637
4638 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4639                                    const void *buf, size_t buflen,
4640                                    int flags, int type)
4641 {
4642         if (strcmp(key, "") != 0)
4643                 return -EINVAL;
4644
4645         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4646 }
4647
4648 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4649                                    void *buf, size_t buflen, int type)
4650 {
4651         if (strcmp(key, "") != 0)
4652                 return -EINVAL;
4653
4654         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4655 }
4656
4657 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4658                                        size_t list_len, const char *name,
4659                                        size_t name_len, int type)
4660 {
4661         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4662
4663         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4664                 return 0;
4665
4666         if (list && len <= list_len)
4667                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4668         return len;
4669 }
4670
4671 /*
4672  * nfs_fhget will use either the mounted_on_fileid or the fileid
4673  */
4674 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4675 {
4676         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4677                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4678               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4679               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4680                 return;
4681
4682         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4683                 NFS_ATTR_FATTR_NLINK;
4684         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4685         fattr->nlink = 2;
4686 }
4687
4688 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4689                 struct nfs4_fs_locations *fs_locations, struct page *page)
4690 {
4691         struct nfs_server *server = NFS_SERVER(dir);
4692         u32 bitmask[2] = {
4693                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4694         };
4695         struct nfs4_fs_locations_arg args = {
4696                 .dir_fh = NFS_FH(dir),
4697                 .name = name,
4698                 .page = page,
4699                 .bitmask = bitmask,
4700         };
4701         struct nfs4_fs_locations_res res = {
4702                 .fs_locations = fs_locations,
4703         };
4704         struct rpc_message msg = {
4705                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4706                 .rpc_argp = &args,
4707                 .rpc_resp = &res,
4708         };
4709         int status;
4710
4711         dprintk("%s: start\n", __func__);
4712
4713         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4714          * is not supported */
4715         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4716                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4717         else
4718                 bitmask[0] |= FATTR4_WORD0_FILEID;
4719
4720         nfs_fattr_init(&fs_locations->fattr);
4721         fs_locations->server = server;
4722         fs_locations->nlocations = 0;
4723         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4724         dprintk("%s: returned status = %d\n", __func__, status);
4725         return status;
4726 }
4727
4728 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4729 {
4730         int status;
4731         struct nfs4_secinfo_arg args = {
4732                 .dir_fh = NFS_FH(dir),
4733                 .name   = name,
4734         };
4735         struct nfs4_secinfo_res res = {
4736                 .flavors     = flavors,
4737         };
4738         struct rpc_message msg = {
4739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4740                 .rpc_argp = &args,
4741                 .rpc_resp = &res,
4742         };
4743
4744         dprintk("NFS call  secinfo %s\n", name->name);
4745         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4746         dprintk("NFS reply  secinfo: %d\n", status);
4747         return status;
4748 }
4749
4750 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4751 {
4752         struct nfs4_exception exception = { };
4753         int err;
4754         do {
4755                 err = nfs4_handle_exception(NFS_SERVER(dir),
4756                                 _nfs4_proc_secinfo(dir, name, flavors),
4757                                 &exception);
4758         } while (exception.retry);
4759         return err;
4760 }
4761
4762 #ifdef CONFIG_NFS_V4_1
4763 /*
4764  * Check the exchange flags returned by the server for invalid flags, having
4765  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4766  * DS flags set.
4767  */
4768 static int nfs4_check_cl_exchange_flags(u32 flags)
4769 {
4770         if (flags & ~EXCHGID4_FLAG_MASK_R)
4771                 goto out_inval;
4772         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4773             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4774                 goto out_inval;
4775         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4776                 goto out_inval;
4777         return NFS_OK;
4778 out_inval:
4779         return -NFS4ERR_INVAL;
4780 }
4781
4782 /*
4783  * nfs4_proc_exchange_id()
4784  *
4785  * Since the clientid has expired, all compounds using sessions
4786  * associated with the stale clientid will be returning
4787  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4788  * be in some phase of session reset.
4789  */
4790 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4791 {
4792         nfs4_verifier verifier;
4793         struct nfs41_exchange_id_args args = {
4794                 .client = clp,
4795                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4796         };
4797         struct nfs41_exchange_id_res res = {
4798                 .client = clp,
4799         };
4800         int status;
4801         struct rpc_message msg = {
4802                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4803                 .rpc_argp = &args,
4804                 .rpc_resp = &res,
4805                 .rpc_cred = cred,
4806         };
4807         __be32 *p;
4808
4809         dprintk("--> %s\n", __func__);
4810         BUG_ON(clp == NULL);
4811
4812         p = (u32 *)verifier.data;
4813         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4814         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4815         args.verifier = &verifier;
4816
4817         args.id_len = scnprintf(args.id, sizeof(args.id),
4818                                 "%s/%s.%s/%u",
4819                                 clp->cl_ipaddr,
4820                                 init_utsname()->nodename,
4821                                 init_utsname()->domainname,
4822                                 clp->cl_rpcclient->cl_auth->au_flavor);
4823
4824         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4825         if (!status)
4826                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4827         dprintk("<-- %s status= %d\n", __func__, status);
4828         return status;
4829 }
4830
4831 struct nfs4_get_lease_time_data {
4832         struct nfs4_get_lease_time_args *args;
4833         struct nfs4_get_lease_time_res *res;
4834         struct nfs_client *clp;
4835 };
4836
4837 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4838                                         void *calldata)
4839 {
4840         int ret;
4841         struct nfs4_get_lease_time_data *data =
4842                         (struct nfs4_get_lease_time_data *)calldata;
4843
4844         dprintk("--> %s\n", __func__);
4845         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4846         /* just setup sequence, do not trigger session recovery
4847            since we're invoked within one */
4848         ret = nfs41_setup_sequence(data->clp->cl_session,
4849                                    &data->args->la_seq_args,
4850                                    &data->res->lr_seq_res, 0, task);
4851
4852         BUG_ON(ret == -EAGAIN);
4853         rpc_call_start(task);
4854         dprintk("<-- %s\n", __func__);
4855 }
4856
4857 /*
4858  * Called from nfs4_state_manager thread for session setup, so don't recover
4859  * from sequence operation or clientid errors.
4860  */
4861 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4862 {
4863         struct nfs4_get_lease_time_data *data =
4864                         (struct nfs4_get_lease_time_data *)calldata;
4865
4866         dprintk("--> %s\n", __func__);
4867         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4868                 return;
4869         switch (task->tk_status) {
4870         case -NFS4ERR_DELAY:
4871         case -NFS4ERR_GRACE:
4872                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4873                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4874                 task->tk_status = 0;
4875                 /* fall through */
4876         case -NFS4ERR_RETRY_UNCACHED_REP:
4877                 nfs_restart_rpc(task, data->clp);
4878                 return;
4879         }
4880         dprintk("<-- %s\n", __func__);
4881 }
4882
4883 struct rpc_call_ops nfs4_get_lease_time_ops = {
4884         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4885         .rpc_call_done = nfs4_get_lease_time_done,
4886 };
4887
4888 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4889 {
4890         struct rpc_task *task;
4891         struct nfs4_get_lease_time_args args;
4892         struct nfs4_get_lease_time_res res = {
4893                 .lr_fsinfo = fsinfo,
4894         };
4895         struct nfs4_get_lease_time_data data = {
4896                 .args = &args,
4897                 .res = &res,
4898                 .clp = clp,
4899         };
4900         struct rpc_message msg = {
4901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4902                 .rpc_argp = &args,
4903                 .rpc_resp = &res,
4904         };
4905         struct rpc_task_setup task_setup = {
4906                 .rpc_client = clp->cl_rpcclient,
4907                 .rpc_message = &msg,
4908                 .callback_ops = &nfs4_get_lease_time_ops,
4909                 .callback_data = &data,
4910                 .flags = RPC_TASK_TIMEOUT,
4911         };
4912         int status;
4913
4914         dprintk("--> %s\n", __func__);
4915         task = rpc_run_task(&task_setup);
4916
4917         if (IS_ERR(task))
4918                 status = PTR_ERR(task);
4919         else {
4920                 status = task->tk_status;
4921                 rpc_put_task(task);
4922         }
4923         dprintk("<-- %s return %d\n", __func__, status);
4924
4925         return status;
4926 }
4927
4928 /*
4929  * Reset a slot table
4930  */
4931 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4932                                  int ivalue)
4933 {
4934         struct nfs4_slot *new = NULL;
4935         int i;
4936         int ret = 0;
4937
4938         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4939                 max_reqs, tbl->max_slots);
4940
4941         /* Does the newly negotiated max_reqs match the existing slot table? */
4942         if (max_reqs != tbl->max_slots) {
4943                 ret = -ENOMEM;
4944                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4945                               GFP_NOFS);
4946                 if (!new)
4947                         goto out;
4948                 ret = 0;
4949                 kfree(tbl->slots);
4950         }
4951         spin_lock(&tbl->slot_tbl_lock);
4952         if (new) {
4953                 tbl->slots = new;
4954                 tbl->max_slots = max_reqs;
4955         }
4956         for (i = 0; i < tbl->max_slots; ++i)
4957                 tbl->slots[i].seq_nr = ivalue;
4958         spin_unlock(&tbl->slot_tbl_lock);
4959         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4960                 tbl, tbl->slots, tbl->max_slots);
4961 out:
4962         dprintk("<-- %s: return %d\n", __func__, ret);
4963         return ret;
4964 }
4965
4966 /*
4967  * Reset the forechannel and backchannel slot tables
4968  */
4969 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4970 {
4971         int status;
4972
4973         status = nfs4_reset_slot_table(&session->fc_slot_table,
4974                         session->fc_attrs.max_reqs, 1);
4975         if (status)
4976                 return status;
4977
4978         status = nfs4_reset_slot_table(&session->bc_slot_table,
4979                         session->bc_attrs.max_reqs, 0);
4980         return status;
4981 }
4982
4983 /* Destroy the slot table */
4984 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4985 {
4986         if (session->fc_slot_table.slots != NULL) {
4987                 kfree(session->fc_slot_table.slots);
4988                 session->fc_slot_table.slots = NULL;
4989         }
4990         if (session->bc_slot_table.slots != NULL) {
4991                 kfree(session->bc_slot_table.slots);
4992                 session->bc_slot_table.slots = NULL;
4993         }
4994         return;
4995 }
4996
4997 /*
4998  * Initialize slot table
4999  */
5000 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5001                 int max_slots, int ivalue)
5002 {
5003         struct nfs4_slot *slot;
5004         int ret = -ENOMEM;
5005
5006         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5007
5008         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5009
5010         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5011         if (!slot)
5012                 goto out;
5013         ret = 0;
5014
5015         spin_lock(&tbl->slot_tbl_lock);
5016         tbl->max_slots = max_slots;
5017         tbl->slots = slot;
5018         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5019         spin_unlock(&tbl->slot_tbl_lock);
5020         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5021                 tbl, tbl->slots, tbl->max_slots);
5022 out:
5023         dprintk("<-- %s: return %d\n", __func__, ret);
5024         return ret;
5025 }
5026
5027 /*
5028  * Initialize the forechannel and backchannel tables
5029  */
5030 static int nfs4_init_slot_tables(struct nfs4_session *session)
5031 {
5032         struct nfs4_slot_table *tbl;
5033         int status = 0;
5034
5035         tbl = &session->fc_slot_table;
5036         if (tbl->slots == NULL) {
5037                 status = nfs4_init_slot_table(tbl,
5038                                 session->fc_attrs.max_reqs, 1);
5039                 if (status)
5040                         return status;
5041         }
5042
5043         tbl = &session->bc_slot_table;
5044         if (tbl->slots == NULL) {
5045                 status = nfs4_init_slot_table(tbl,
5046                                 session->bc_attrs.max_reqs, 0);
5047                 if (status)
5048                         nfs4_destroy_slot_tables(session);
5049         }
5050
5051         return status;
5052 }
5053
5054 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5055 {
5056         struct nfs4_session *session;
5057         struct nfs4_slot_table *tbl;
5058
5059         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5060         if (!session)
5061                 return NULL;
5062
5063         tbl = &session->fc_slot_table;
5064         tbl->highest_used_slotid = -1;
5065         spin_lock_init(&tbl->slot_tbl_lock);
5066         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5067         init_completion(&tbl->complete);
5068
5069         tbl = &session->bc_slot_table;
5070         tbl->highest_used_slotid = -1;
5071         spin_lock_init(&tbl->slot_tbl_lock);
5072         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5073         init_completion(&tbl->complete);
5074
5075         session->session_state = 1<<NFS4_SESSION_INITING;
5076
5077         session->clp = clp;
5078         return session;
5079 }
5080
5081 void nfs4_destroy_session(struct nfs4_session *session)
5082 {
5083         nfs4_proc_destroy_session(session);
5084         dprintk("%s Destroy backchannel for xprt %p\n",
5085                 __func__, session->clp->cl_rpcclient->cl_xprt);
5086         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5087                                 NFS41_BC_MIN_CALLBACKS);
5088         nfs4_destroy_slot_tables(session);
5089         kfree(session);
5090 }
5091
5092 /*
5093  * Initialize the values to be used by the client in CREATE_SESSION
5094  * If nfs4_init_session set the fore channel request and response sizes,
5095  * use them.
5096  *
5097  * Set the back channel max_resp_sz_cached to zero to force the client to
5098  * always set csa_cachethis to FALSE because the current implementation
5099  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5100  */
5101 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5102 {
5103         struct nfs4_session *session = args->client->cl_session;
5104         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5105                      mxresp_sz = session->fc_attrs.max_resp_sz;
5106
5107         if (mxrqst_sz == 0)
5108                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5109         if (mxresp_sz == 0)
5110                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5111         /* Fore channel attributes */
5112         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5113         args->fc_attrs.max_resp_sz = mxresp_sz;
5114         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5115         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5116
5117         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5118                 "max_ops=%u max_reqs=%u\n",
5119                 __func__,
5120                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5121                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5122
5123         /* Back channel attributes */
5124         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5125         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5126         args->bc_attrs.max_resp_sz_cached = 0;
5127         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5128         args->bc_attrs.max_reqs = 1;
5129
5130         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5131                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5132                 __func__,
5133                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5134                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5135                 args->bc_attrs.max_reqs);
5136 }
5137
5138 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5139 {
5140         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5141         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5142
5143         if (rcvd->max_resp_sz > sent->max_resp_sz)
5144                 return -EINVAL;
5145         /*
5146          * Our requested max_ops is the minimum we need; we're not
5147          * prepared to break up compounds into smaller pieces than that.
5148          * So, no point even trying to continue if the server won't
5149          * cooperate:
5150          */
5151         if (rcvd->max_ops < sent->max_ops)
5152                 return -EINVAL;
5153         if (rcvd->max_reqs == 0)
5154                 return -EINVAL;
5155         return 0;
5156 }
5157
5158 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5159 {
5160         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5161         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5162
5163         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5164                 return -EINVAL;
5165         if (rcvd->max_resp_sz < sent->max_resp_sz)
5166                 return -EINVAL;
5167         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5168                 return -EINVAL;
5169         /* These would render the backchannel useless: */
5170         if (rcvd->max_ops  == 0)
5171                 return -EINVAL;
5172         if (rcvd->max_reqs == 0)
5173                 return -EINVAL;
5174         return 0;
5175 }
5176
5177 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5178                                      struct nfs4_session *session)
5179 {
5180         int ret;
5181
5182         ret = nfs4_verify_fore_channel_attrs(args, session);
5183         if (ret)
5184                 return ret;
5185         return nfs4_verify_back_channel_attrs(args, session);
5186 }
5187
5188 static int _nfs4_proc_create_session(struct nfs_client *clp)
5189 {
5190         struct nfs4_session *session = clp->cl_session;
5191         struct nfs41_create_session_args args = {
5192                 .client = clp,
5193                 .cb_program = NFS4_CALLBACK,
5194         };
5195         struct nfs41_create_session_res res = {
5196                 .client = clp,
5197         };
5198         struct rpc_message msg = {
5199                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5200                 .rpc_argp = &args,
5201                 .rpc_resp = &res,
5202         };
5203         int status;
5204
5205         nfs4_init_channel_attrs(&args);
5206         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5207
5208         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5209
5210         if (!status)
5211                 /* Verify the session's negotiated channel_attrs values */
5212                 status = nfs4_verify_channel_attrs(&args, session);
5213         if (!status) {
5214                 /* Increment the clientid slot sequence id */
5215                 clp->cl_seqid++;
5216         }
5217
5218         return status;
5219 }
5220
5221 /*
5222  * Issues a CREATE_SESSION operation to the server.
5223  * It is the responsibility of the caller to verify the session is
5224  * expired before calling this routine.
5225  */
5226 int nfs4_proc_create_session(struct nfs_client *clp)
5227 {
5228         int status;
5229         unsigned *ptr;
5230         struct nfs4_session *session = clp->cl_session;
5231
5232         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5233
5234         status = _nfs4_proc_create_session(clp);
5235         if (status)
5236                 goto out;
5237
5238         /* Init and reset the fore channel */
5239         status = nfs4_init_slot_tables(session);
5240         dprintk("slot table initialization returned %d\n", status);
5241         if (status)
5242                 goto out;
5243         status = nfs4_reset_slot_tables(session);
5244         dprintk("slot table reset returned %d\n", status);
5245         if (status)
5246                 goto out;
5247
5248         ptr = (unsigned *)&session->sess_id.data[0];
5249         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5250                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5251 out:
5252         dprintk("<-- %s\n", __func__);
5253         return status;
5254 }
5255
5256 /*
5257  * Issue the over-the-wire RPC DESTROY_SESSION.
5258  * The caller must serialize access to this routine.
5259  */
5260 int nfs4_proc_destroy_session(struct nfs4_session *session)
5261 {
5262         int status = 0;
5263         struct rpc_message msg;
5264
5265         dprintk("--> nfs4_proc_destroy_session\n");
5266
5267         /* session is still being setup */
5268         if (session->clp->cl_cons_state != NFS_CS_READY)
5269                 return status;
5270
5271         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5272         msg.rpc_argp = session;
5273         msg.rpc_resp = NULL;
5274         msg.rpc_cred = NULL;
5275         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5276
5277         if (status)
5278                 printk(KERN_WARNING
5279                         "Got error %d from the server on DESTROY_SESSION. "
5280                         "Session has been destroyed regardless...\n", status);
5281
5282         dprintk("<-- nfs4_proc_destroy_session\n");
5283         return status;
5284 }
5285
5286 int nfs4_init_session(struct nfs_server *server)
5287 {
5288         struct nfs_client *clp = server->nfs_client;
5289         struct nfs4_session *session;
5290         unsigned int rsize, wsize;
5291         int ret;
5292
5293         if (!nfs4_has_session(clp))
5294                 return 0;
5295
5296         session = clp->cl_session;
5297         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5298                 return 0;
5299
5300         rsize = server->rsize;
5301         if (rsize == 0)
5302                 rsize = NFS_MAX_FILE_IO_SIZE;
5303         wsize = server->wsize;
5304         if (wsize == 0)
5305                 wsize = NFS_MAX_FILE_IO_SIZE;
5306
5307         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5308         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5309
5310         ret = nfs4_recover_expired_lease(server);
5311         if (!ret)
5312                 ret = nfs4_check_client_ready(clp);
5313         return ret;
5314 }
5315
5316 int nfs4_init_ds_session(struct nfs_client *clp)
5317 {
5318         struct nfs4_session *session = clp->cl_session;
5319         int ret;
5320
5321         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5322                 return 0;
5323
5324         ret = nfs4_client_recover_expired_lease(clp);
5325         if (!ret)
5326                 /* Test for the DS role */
5327                 if (!is_ds_client(clp))
5328                         ret = -ENODEV;
5329         if (!ret)
5330                 ret = nfs4_check_client_ready(clp);
5331         return ret;
5332
5333 }
5334 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5335
5336
5337 /*
5338  * Renew the cl_session lease.
5339  */
5340 struct nfs4_sequence_data {
5341         struct nfs_client *clp;
5342         struct nfs4_sequence_args args;
5343         struct nfs4_sequence_res res;
5344 };
5345
5346 static void nfs41_sequence_release(void *data)
5347 {
5348         struct nfs4_sequence_data *calldata = data;
5349         struct nfs_client *clp = calldata->clp;
5350
5351         if (atomic_read(&clp->cl_count) > 1)
5352                 nfs4_schedule_state_renewal(clp);
5353         nfs_put_client(clp);
5354         kfree(calldata);
5355 }
5356
5357 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5358 {
5359         switch(task->tk_status) {
5360         case -NFS4ERR_DELAY:
5361                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5362                 return -EAGAIN;
5363         default:
5364                 nfs4_schedule_lease_recovery(clp);
5365         }
5366         return 0;
5367 }
5368
5369 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5370 {
5371         struct nfs4_sequence_data *calldata = data;
5372         struct nfs_client *clp = calldata->clp;
5373
5374         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5375                 return;
5376
5377         if (task->tk_status < 0) {
5378                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5379                 if (atomic_read(&clp->cl_count) == 1)
5380                         goto out;
5381
5382                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5383                         rpc_restart_call_prepare(task);
5384                         return;
5385                 }
5386         }
5387         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5388 out:
5389         dprintk("<-- %s\n", __func__);
5390 }
5391
5392 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5393 {
5394         struct nfs4_sequence_data *calldata = data;
5395         struct nfs_client *clp = calldata->clp;
5396         struct nfs4_sequence_args *args;
5397         struct nfs4_sequence_res *res;
5398
5399         args = task->tk_msg.rpc_argp;
5400         res = task->tk_msg.rpc_resp;
5401
5402         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5403                 return;
5404         rpc_call_start(task);
5405 }
5406
5407 static const struct rpc_call_ops nfs41_sequence_ops = {
5408         .rpc_call_done = nfs41_sequence_call_done,
5409         .rpc_call_prepare = nfs41_sequence_prepare,
5410         .rpc_release = nfs41_sequence_release,
5411 };
5412
5413 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5414 {
5415         struct nfs4_sequence_data *calldata;
5416         struct rpc_message msg = {
5417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5418                 .rpc_cred = cred,
5419         };
5420         struct rpc_task_setup task_setup_data = {
5421                 .rpc_client = clp->cl_rpcclient,
5422                 .rpc_message = &msg,
5423                 .callback_ops = &nfs41_sequence_ops,
5424                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5425         };
5426
5427         if (!atomic_inc_not_zero(&clp->cl_count))
5428                 return ERR_PTR(-EIO);
5429         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5430         if (calldata == NULL) {
5431                 nfs_put_client(clp);
5432                 return ERR_PTR(-ENOMEM);
5433         }
5434         msg.rpc_argp = &calldata->args;
5435         msg.rpc_resp = &calldata->res;
5436         calldata->clp = clp;
5437         task_setup_data.callback_data = calldata;
5438
5439         return rpc_run_task(&task_setup_data);
5440 }
5441
5442 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5443 {
5444         struct rpc_task *task;
5445         int ret = 0;
5446
5447         task = _nfs41_proc_sequence(clp, cred);
5448         if (IS_ERR(task))
5449                 ret = PTR_ERR(task);
5450         else
5451                 rpc_put_task_async(task);
5452         dprintk("<-- %s status=%d\n", __func__, ret);
5453         return ret;
5454 }
5455
5456 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5457 {
5458         struct rpc_task *task;
5459         int ret;
5460
5461         task = _nfs41_proc_sequence(clp, cred);
5462         if (IS_ERR(task)) {
5463                 ret = PTR_ERR(task);
5464                 goto out;
5465         }
5466         ret = rpc_wait_for_completion_task(task);
5467         if (!ret) {
5468                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5469
5470                 if (task->tk_status == 0)
5471                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5472                 ret = task->tk_status;
5473         }
5474         rpc_put_task(task);
5475 out:
5476         dprintk("<-- %s status=%d\n", __func__, ret);
5477         return ret;
5478 }
5479
5480 struct nfs4_reclaim_complete_data {
5481         struct nfs_client *clp;
5482         struct nfs41_reclaim_complete_args arg;
5483         struct nfs41_reclaim_complete_res res;
5484 };
5485
5486 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5487 {
5488         struct nfs4_reclaim_complete_data *calldata = data;
5489
5490         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5491         if (nfs41_setup_sequence(calldata->clp->cl_session,
5492                                 &calldata->arg.seq_args,
5493                                 &calldata->res.seq_res, 0, task))
5494                 return;
5495
5496         rpc_call_start(task);
5497 }
5498
5499 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5500 {
5501         switch(task->tk_status) {
5502         case 0:
5503         case -NFS4ERR_COMPLETE_ALREADY:
5504         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5505                 break;
5506         case -NFS4ERR_DELAY:
5507                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5508                 /* fall through */
5509         case -NFS4ERR_RETRY_UNCACHED_REP:
5510                 return -EAGAIN;
5511         default:
5512                 nfs4_schedule_lease_recovery(clp);
5513         }
5514         return 0;
5515 }
5516
5517 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5518 {
5519         struct nfs4_reclaim_complete_data *calldata = data;
5520         struct nfs_client *clp = calldata->clp;
5521         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5522
5523         dprintk("--> %s\n", __func__);
5524         if (!nfs41_sequence_done(task, res))
5525                 return;
5526
5527         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5528                 rpc_restart_call_prepare(task);
5529                 return;
5530         }
5531         dprintk("<-- %s\n", __func__);
5532 }
5533
5534 static void nfs4_free_reclaim_complete_data(void *data)
5535 {
5536         struct nfs4_reclaim_complete_data *calldata = data;
5537
5538         kfree(calldata);
5539 }
5540
5541 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5542         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5543         .rpc_call_done = nfs4_reclaim_complete_done,
5544         .rpc_release = nfs4_free_reclaim_complete_data,
5545 };
5546
5547 /*
5548  * Issue a global reclaim complete.
5549  */
5550 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5551 {
5552         struct nfs4_reclaim_complete_data *calldata;
5553         struct rpc_task *task;
5554         struct rpc_message msg = {
5555                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5556         };
5557         struct rpc_task_setup task_setup_data = {
5558                 .rpc_client = clp->cl_rpcclient,
5559                 .rpc_message = &msg,
5560                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5561                 .flags = RPC_TASK_ASYNC,
5562         };
5563         int status = -ENOMEM;
5564
5565         dprintk("--> %s\n", __func__);
5566         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5567         if (calldata == NULL)
5568                 goto out;
5569         calldata->clp = clp;
5570         calldata->arg.one_fs = 0;
5571
5572         msg.rpc_argp = &calldata->arg;
5573         msg.rpc_resp = &calldata->res;
5574         task_setup_data.callback_data = calldata;
5575         task = rpc_run_task(&task_setup_data);
5576         if (IS_ERR(task)) {
5577                 status = PTR_ERR(task);
5578                 goto out;
5579         }
5580         status = nfs4_wait_for_completion_rpc_task(task);
5581         if (status == 0)
5582                 status = task->tk_status;
5583         rpc_put_task(task);
5584         return 0;
5585 out:
5586         dprintk("<-- %s status=%d\n", __func__, status);
5587         return status;
5588 }
5589
5590 static void
5591 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5592 {
5593         struct nfs4_layoutget *lgp = calldata;
5594         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5595
5596         dprintk("--> %s\n", __func__);
5597         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5598          * right now covering the LAYOUTGET we are about to send.
5599          * However, that is not so catastrophic, and there seems
5600          * to be no way to prevent it completely.
5601          */
5602         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5603                                 &lgp->res.seq_res, 0, task))
5604                 return;
5605         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5606                                           NFS_I(lgp->args.inode)->layout,
5607                                           lgp->args.ctx->state)) {
5608                 rpc_exit(task, NFS4_OK);
5609                 return;
5610         }
5611         rpc_call_start(task);
5612 }
5613
5614 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5615 {
5616         struct nfs4_layoutget *lgp = calldata;
5617         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5618
5619         dprintk("--> %s\n", __func__);
5620
5621         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5622                 return;
5623
5624         switch (task->tk_status) {
5625         case 0:
5626                 break;
5627         case -NFS4ERR_LAYOUTTRYLATER:
5628         case -NFS4ERR_RECALLCONFLICT:
5629                 task->tk_status = -NFS4ERR_DELAY;
5630                 /* Fall through */
5631         default:
5632                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5633                         rpc_restart_call_prepare(task);
5634                         return;
5635                 }
5636         }
5637         dprintk("<-- %s\n", __func__);
5638 }
5639
5640 static void nfs4_layoutget_release(void *calldata)
5641 {
5642         struct nfs4_layoutget *lgp = calldata;
5643
5644         dprintk("--> %s\n", __func__);
5645         put_nfs_open_context(lgp->args.ctx);
5646         kfree(calldata);
5647         dprintk("<-- %s\n", __func__);
5648 }
5649
5650 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5651         .rpc_call_prepare = nfs4_layoutget_prepare,
5652         .rpc_call_done = nfs4_layoutget_done,
5653         .rpc_release = nfs4_layoutget_release,
5654 };
5655
5656 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5657 {
5658         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5659         struct rpc_task *task;
5660         struct rpc_message msg = {
5661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5662                 .rpc_argp = &lgp->args,
5663                 .rpc_resp = &lgp->res,
5664         };
5665         struct rpc_task_setup task_setup_data = {
5666                 .rpc_client = server->client,
5667                 .rpc_message = &msg,
5668                 .callback_ops = &nfs4_layoutget_call_ops,
5669                 .callback_data = lgp,
5670                 .flags = RPC_TASK_ASYNC,
5671         };
5672         int status = 0;
5673
5674         dprintk("--> %s\n", __func__);
5675
5676         lgp->res.layoutp = &lgp->args.layout;
5677         lgp->res.seq_res.sr_slot = NULL;
5678         task = rpc_run_task(&task_setup_data);
5679         if (IS_ERR(task))
5680                 return PTR_ERR(task);
5681         status = nfs4_wait_for_completion_rpc_task(task);
5682         if (status == 0)
5683                 status = task->tk_status;
5684         if (status == 0)
5685                 status = pnfs_layout_process(lgp);
5686         rpc_put_task(task);
5687         dprintk("<-- %s status=%d\n", __func__, status);
5688         return status;
5689 }
5690
5691 static void
5692 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5693 {
5694         struct nfs4_layoutreturn *lrp = calldata;
5695
5696         dprintk("--> %s\n", __func__);
5697         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5698                                 &lrp->res.seq_res, 0, task))
5699                 return;
5700         rpc_call_start(task);
5701 }
5702
5703 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5704 {
5705         struct nfs4_layoutreturn *lrp = calldata;
5706         struct nfs_server *server;
5707         struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
5708
5709         dprintk("--> %s\n", __func__);
5710
5711         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5712                 return;
5713
5714         server = NFS_SERVER(lrp->args.inode);
5715         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5716                 nfs_restart_rpc(task, lrp->clp);
5717                 return;
5718         }
5719         spin_lock(&lo->plh_inode->i_lock);
5720         if (task->tk_status == 0) {
5721                 if (lrp->res.lrs_present) {
5722                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5723                 } else
5724                         BUG_ON(!list_empty(&lo->plh_segs));
5725         }
5726         lo->plh_block_lgets--;
5727         spin_unlock(&lo->plh_inode->i_lock);
5728         dprintk("<-- %s\n", __func__);
5729 }
5730
5731 static void nfs4_layoutreturn_release(void *calldata)
5732 {
5733         struct nfs4_layoutreturn *lrp = calldata;
5734
5735         dprintk("--> %s\n", __func__);
5736         put_layout_hdr(NFS_I(lrp->args.inode)->layout);
5737         kfree(calldata);
5738         dprintk("<-- %s\n", __func__);
5739 }
5740
5741 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5742         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5743         .rpc_call_done = nfs4_layoutreturn_done,
5744         .rpc_release = nfs4_layoutreturn_release,
5745 };
5746
5747 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5748 {
5749         struct rpc_task *task;
5750         struct rpc_message msg = {
5751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5752                 .rpc_argp = &lrp->args,
5753                 .rpc_resp = &lrp->res,
5754         };
5755         struct rpc_task_setup task_setup_data = {
5756                 .rpc_client = lrp->clp->cl_rpcclient,
5757                 .rpc_message = &msg,
5758                 .callback_ops = &nfs4_layoutreturn_call_ops,
5759                 .callback_data = lrp,
5760         };
5761         int status;
5762
5763         dprintk("--> %s\n", __func__);
5764         task = rpc_run_task(&task_setup_data);
5765         if (IS_ERR(task))
5766                 return PTR_ERR(task);
5767         status = task->tk_status;
5768         dprintk("<-- %s status=%d\n", __func__, status);
5769         rpc_put_task(task);
5770         return status;
5771 }
5772
5773 static int
5774 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5775 {
5776         struct nfs4_getdeviceinfo_args args = {
5777                 .pdev = pdev,
5778         };
5779         struct nfs4_getdeviceinfo_res res = {
5780                 .pdev = pdev,
5781         };
5782         struct rpc_message msg = {
5783                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5784                 .rpc_argp = &args,
5785                 .rpc_resp = &res,
5786         };
5787         int status;
5788
5789         dprintk("--> %s\n", __func__);
5790         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5791         dprintk("<-- %s status=%d\n", __func__, status);
5792
5793         return status;
5794 }
5795
5796 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5797 {
5798         struct nfs4_exception exception = { };
5799         int err;
5800
5801         do {
5802                 err = nfs4_handle_exception(server,
5803                                         _nfs4_proc_getdeviceinfo(server, pdev),
5804                                         &exception);
5805         } while (exception.retry);
5806         return err;
5807 }
5808 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5809
5810 static void nfs4_layoutcommit_prepare(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_setup_sequence(server, &data->args.seq_args,
5816                                 &data->res.seq_res, 1, task))
5817                 return;
5818         rpc_call_start(task);
5819 }
5820
5821 static void
5822 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5823 {
5824         struct nfs4_layoutcommit_data *data = calldata;
5825         struct nfs_server *server = NFS_SERVER(data->args.inode);
5826
5827         if (!nfs4_sequence_done(task, &data->res.seq_res))
5828                 return;
5829
5830         switch (task->tk_status) { /* Just ignore these failures */
5831         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5832         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5833         case NFS4ERR_BADLAYOUT:     /* no layout */
5834         case NFS4ERR_GRACE:         /* loca_recalim always false */
5835                 task->tk_status = 0;
5836         }
5837
5838         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5839                 nfs_restart_rpc(task, server->nfs_client);
5840                 return;
5841         }
5842
5843         if (task->tk_status == 0)
5844                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5845                                                    data->res.fattr);
5846 }
5847
5848 static void nfs4_layoutcommit_release(void *calldata)
5849 {
5850         struct nfs4_layoutcommit_data *data = calldata;
5851
5852         /* Matched by references in pnfs_set_layoutcommit */
5853         put_lseg(data->lseg);
5854         put_rpccred(data->cred);
5855         kfree(data);
5856 }
5857
5858 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5859         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5860         .rpc_call_done = nfs4_layoutcommit_done,
5861         .rpc_release = nfs4_layoutcommit_release,
5862 };
5863
5864 int
5865 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5866 {
5867         struct rpc_message msg = {
5868                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5869                 .rpc_argp = &data->args,
5870                 .rpc_resp = &data->res,
5871                 .rpc_cred = data->cred,
5872         };
5873         struct rpc_task_setup task_setup_data = {
5874                 .task = &data->task,
5875                 .rpc_client = NFS_CLIENT(data->args.inode),
5876                 .rpc_message = &msg,
5877                 .callback_ops = &nfs4_layoutcommit_ops,
5878                 .callback_data = data,
5879                 .flags = RPC_TASK_ASYNC,
5880         };
5881         struct rpc_task *task;
5882         int status = 0;
5883
5884         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5885                 "lbw: %llu inode %lu\n",
5886                 data->task.tk_pid, sync,
5887                 data->args.lastbytewritten,
5888                 data->args.inode->i_ino);
5889
5890         task = rpc_run_task(&task_setup_data);
5891         if (IS_ERR(task))
5892                 return PTR_ERR(task);
5893         if (sync == false)
5894                 goto out;
5895         status = nfs4_wait_for_completion_rpc_task(task);
5896         if (status != 0)
5897                 goto out;
5898         status = task->tk_status;
5899 out:
5900         dprintk("%s: status %d\n", __func__, status);
5901         rpc_put_task(task);
5902         return status;
5903 }
5904 #endif /* CONFIG_NFS_V4_1 */
5905
5906 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5907         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5908         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5909         .recover_open   = nfs4_open_reclaim,
5910         .recover_lock   = nfs4_lock_reclaim,
5911         .establish_clid = nfs4_init_clientid,
5912         .get_clid_cred  = nfs4_get_setclientid_cred,
5913 };
5914
5915 #if defined(CONFIG_NFS_V4_1)
5916 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5917         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5918         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5919         .recover_open   = nfs4_open_reclaim,
5920         .recover_lock   = nfs4_lock_reclaim,
5921         .establish_clid = nfs41_init_clientid,
5922         .get_clid_cred  = nfs4_get_exchange_id_cred,
5923         .reclaim_complete = nfs41_proc_reclaim_complete,
5924 };
5925 #endif /* CONFIG_NFS_V4_1 */
5926
5927 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5928         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5929         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5930         .recover_open   = nfs4_open_expired,
5931         .recover_lock   = nfs4_lock_expired,
5932         .establish_clid = nfs4_init_clientid,
5933         .get_clid_cred  = nfs4_get_setclientid_cred,
5934 };
5935
5936 #if defined(CONFIG_NFS_V4_1)
5937 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5938         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5939         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5940         .recover_open   = nfs4_open_expired,
5941         .recover_lock   = nfs4_lock_expired,
5942         .establish_clid = nfs41_init_clientid,
5943         .get_clid_cred  = nfs4_get_exchange_id_cred,
5944 };
5945 #endif /* CONFIG_NFS_V4_1 */
5946
5947 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5948         .sched_state_renewal = nfs4_proc_async_renew,
5949         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5950         .renew_lease = nfs4_proc_renew,
5951 };
5952
5953 #if defined(CONFIG_NFS_V4_1)
5954 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5955         .sched_state_renewal = nfs41_proc_async_sequence,
5956         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5957         .renew_lease = nfs4_proc_sequence,
5958 };
5959 #endif
5960
5961 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5962         .minor_version = 0,
5963         .call_sync = _nfs4_call_sync,
5964         .validate_stateid = nfs4_validate_delegation_stateid,
5965         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5966         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5967         .state_renewal_ops = &nfs40_state_renewal_ops,
5968 };
5969
5970 #if defined(CONFIG_NFS_V4_1)
5971 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5972         .minor_version = 1,
5973         .call_sync = _nfs4_call_sync_session,
5974         .validate_stateid = nfs41_validate_delegation_stateid,
5975         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5976         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5977         .state_renewal_ops = &nfs41_state_renewal_ops,
5978 };
5979 #endif
5980
5981 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5982         [0] = &nfs_v4_0_minor_ops,
5983 #if defined(CONFIG_NFS_V4_1)
5984         [1] = &nfs_v4_1_minor_ops,
5985 #endif
5986 };
5987
5988 static const struct inode_operations nfs4_file_inode_operations = {
5989         .permission     = nfs_permission,
5990         .getattr        = nfs_getattr,
5991         .setattr        = nfs_setattr,
5992         .getxattr       = generic_getxattr,
5993         .setxattr       = generic_setxattr,
5994         .listxattr      = generic_listxattr,
5995         .removexattr    = generic_removexattr,
5996 };
5997
5998 const struct nfs_rpc_ops nfs_v4_clientops = {
5999         .version        = 4,                    /* protocol version */
6000         .dentry_ops     = &nfs4_dentry_operations,
6001         .dir_inode_ops  = &nfs4_dir_inode_operations,
6002         .file_inode_ops = &nfs4_file_inode_operations,
6003         .getroot        = nfs4_proc_get_root,
6004         .getattr        = nfs4_proc_getattr,
6005         .setattr        = nfs4_proc_setattr,
6006         .lookupfh       = nfs4_proc_lookupfh,
6007         .lookup         = nfs4_proc_lookup,
6008         .access         = nfs4_proc_access,
6009         .readlink       = nfs4_proc_readlink,
6010         .create         = nfs4_proc_create,
6011         .remove         = nfs4_proc_remove,
6012         .unlink_setup   = nfs4_proc_unlink_setup,
6013         .unlink_done    = nfs4_proc_unlink_done,
6014         .rename         = nfs4_proc_rename,
6015         .rename_setup   = nfs4_proc_rename_setup,
6016         .rename_done    = nfs4_proc_rename_done,
6017         .link           = nfs4_proc_link,
6018         .symlink        = nfs4_proc_symlink,
6019         .mkdir          = nfs4_proc_mkdir,
6020         .rmdir          = nfs4_proc_remove,
6021         .readdir        = nfs4_proc_readdir,
6022         .mknod          = nfs4_proc_mknod,
6023         .statfs         = nfs4_proc_statfs,
6024         .fsinfo         = nfs4_proc_fsinfo,
6025         .pathconf       = nfs4_proc_pathconf,
6026         .set_capabilities = nfs4_server_capabilities,
6027         .decode_dirent  = nfs4_decode_dirent,
6028         .read_setup     = nfs4_proc_read_setup,
6029         .read_done      = nfs4_read_done,
6030         .write_setup    = nfs4_proc_write_setup,
6031         .write_done     = nfs4_write_done,
6032         .commit_setup   = nfs4_proc_commit_setup,
6033         .commit_done    = nfs4_commit_done,
6034         .lock           = nfs4_proc_lock,
6035         .clear_acl_cache = nfs4_zap_acl_attr,
6036         .close_context  = nfs4_close_context,
6037         .open_context   = nfs4_atomic_open,
6038         .init_client    = nfs4_init_client,
6039         .secinfo        = nfs4_proc_secinfo,
6040 };
6041
6042 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6043         .prefix = XATTR_NAME_NFSV4_ACL,
6044         .list   = nfs4_xattr_list_nfs4_acl,
6045         .get    = nfs4_xattr_get_nfs4_acl,
6046         .set    = nfs4_xattr_set_nfs4_acl,
6047 };
6048
6049 const struct xattr_handler *nfs4_xattr_handlers[] = {
6050         &nfs4_xattr_nfs4_acl_handler,
6051         NULL
6052 };
6053
6054 /*
6055  * Local variables:
6056  *  c-basic-offset: 8
6057  * End:
6058  */