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/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/sunrpc/bc_xprt.h>
  56 #include <linux/xattr.h>
  57 #include <linux/utsname.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65
  66 #define NFSDBG_FACILITY         NFSDBG_PROC
  67
  68 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  69 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  70
  71 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  72
  73 struct nfs4_opendata;
  74 static int _nfs4_proc_open(struct nfs4_opendata *data);
  75 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  76 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  77 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  78 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  79 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  80                             struct nfs_fattr *fattr, struct iattr *sattr,
  81                             struct nfs4_state *state);
  82 #ifdef CONFIG_NFS_V4_1
  83 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  84 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  85 #endif
  86 /* Prevent leaks of NFSv4 errors into userland */
  87 static int nfs4_map_errors(int err)
  88 {
  89         if (err >= -1000)
  90                 return err;
  91         switch (err) {
  92         case -NFS4ERR_RESOURCE:
  93                 return -EREMOTEIO;
  94         case -NFS4ERR_WRONGSEC:
  95                 return -EPERM;
  96         case -NFS4ERR_BADOWNER:
  97         case -NFS4ERR_BADNAME:
  98                 return -EINVAL;
  99         case -NFS4ERR_SHARE_DENIED:
 100                 return -EACCES;
 101         default:
 102                 dprintk("%s could not handle NFSv4 error %d\n",
 103                                 __func__, -err);
 104                 break;
 105         }
 106         return -EIO;
 107 }
 108
 109 /*
 110  * This is our standard bitmap for GETATTR requests.
 111  */
 112 const u32 nfs4_fattr_bitmap[2] = {
 113         FATTR4_WORD0_TYPE
 114         | FATTR4_WORD0_CHANGE
 115         | FATTR4_WORD0_SIZE
 116         | FATTR4_WORD0_FSID
 117         | FATTR4_WORD0_FILEID,
 118         FATTR4_WORD1_MODE
 119         | FATTR4_WORD1_NUMLINKS
 120         | FATTR4_WORD1_OWNER
 121         | FATTR4_WORD1_OWNER_GROUP
 122         | FATTR4_WORD1_RAWDEV
 123         | FATTR4_WORD1_SPACE_USED
 124         | FATTR4_WORD1_TIME_ACCESS
 125         | FATTR4_WORD1_TIME_METADATA
 126         | FATTR4_WORD1_TIME_MODIFY
 127 };
 128
 129 const u32 nfs4_statfs_bitmap[2] = {
 130         FATTR4_WORD0_FILES_AVAIL
 131         | FATTR4_WORD0_FILES_FREE
 132         | FATTR4_WORD0_FILES_TOTAL,
 133         FATTR4_WORD1_SPACE_AVAIL
 134         | FATTR4_WORD1_SPACE_FREE
 135         | FATTR4_WORD1_SPACE_TOTAL
 136 };
 137
 138 const u32 nfs4_pathconf_bitmap[2] = {
 139         FATTR4_WORD0_MAXLINK
 140         | FATTR4_WORD0_MAXNAME,
 141         0
 142 };
 143
 144 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 145                         | FATTR4_WORD0_MAXREAD
 146                         | FATTR4_WORD0_MAXWRITE
 147                         | FATTR4_WORD0_LEASE_TIME,
 148                         FATTR4_WORD1_TIME_DELTA
 149                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 150                         FATTR4_WORD2_LAYOUT_BLKSIZE
 151 };
 152
 153 const u32 nfs4_fs_locations_bitmap[2] = {
 154         FATTR4_WORD0_TYPE
 155         | FATTR4_WORD0_CHANGE
 156         | FATTR4_WORD0_SIZE
 157         | FATTR4_WORD0_FSID
 158         | FATTR4_WORD0_FILEID
 159         | FATTR4_WORD0_FS_LOCATIONS,
 160         FATTR4_WORD1_MODE
 161         | FATTR4_WORD1_NUMLINKS
 162         | FATTR4_WORD1_OWNER
 163         | FATTR4_WORD1_OWNER_GROUP
 164         | FATTR4_WORD1_RAWDEV
 165         | FATTR4_WORD1_SPACE_USED
 166         | FATTR4_WORD1_TIME_ACCESS
 167         | FATTR4_WORD1_TIME_METADATA
 168         | FATTR4_WORD1_TIME_MODIFY
 169         | FATTR4_WORD1_MOUNTED_ON_FILEID
 170 };
 171
 172 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 173                 struct nfs4_readdir_arg *readdir)
 174 {
 175         __be32 *start, *p;
 176
 177         BUG_ON(readdir->count < 80);
 178         if (cookie > 2) {
 179                 readdir->cookie = cookie;
 180                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 181                 return;
 182         }
 183
 184         readdir->cookie = 0;
 185         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 186         if (cookie == 2)
 187                 return;
 188
 189         /*
 190          * NFSv4 servers do not return entries for '.' and '..'
 191          * Therefore, we fake these entries here.  We let '.'
 192          * have cookie 0 and '..' have cookie 1.  Note that
 193          * when talking to the server, we always send cookie 0
 194          * instead of 1 or 2.
 195          */
 196         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 197
 198         if (cookie == 0) {
 199                 *p++ = xdr_one;                                  /* next */
 200                 *p++ = xdr_zero;                   /* cookie, first word */
 201                 *p++ = xdr_one;                   /* cookie, second word */
 202                 *p++ = xdr_one;                             /* entry len */
 203                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 204                 p++;
 205                 *p++ = xdr_one;                         /* bitmap length */
 206                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 207                 *p++ = htonl(8);              /* attribute buffer length */
 208                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 209         }
 210
 211         *p++ = xdr_one;                                  /* next */
 212         *p++ = xdr_zero;                   /* cookie, first word */
 213         *p++ = xdr_two;                   /* cookie, second word */
 214         *p++ = xdr_two;                             /* entry len */
 215         memcpy(p, "..\0\0", 4);                         /* entry */
 216         p++;
 217         *p++ = xdr_one;                         /* bitmap length */
 218         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 219         *p++ = htonl(8);              /* attribute buffer length */
 220         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 221
 222         readdir->pgbase = (char *)p - (char *)start;
 223         readdir->count -= readdir->pgbase;
 224         kunmap_atomic(start, KM_USER0);
 225 }
 226
 227 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 228 {
 229         int res;
 230
 231         might_sleep();
 232
 233         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 234                         nfs_wait_bit_killable, TASK_KILLABLE);
 235         return res;
 236 }
 237
 238 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 239 {
 240         int res = 0;
 241
 242         might_sleep();
 243
 244         if (*timeout <= 0)
 245                 *timeout = NFS4_POLL_RETRY_MIN;
 246         if (*timeout > NFS4_POLL_RETRY_MAX)
 247                 *timeout = NFS4_POLL_RETRY_MAX;
 248         schedule_timeout_killable(*timeout);
 249         if (fatal_signal_pending(current))
 250                 res = -ERESTARTSYS;
 251         *timeout <<= 1;
 252         return res;
 253 }
 254
 255 /* This is the error handling routine for processes that are allowed
 256  * to sleep.
 257  */
 258 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 259 {
 260         struct nfs_client *clp = server->nfs_client;
 261         struct nfs4_state *state = exception->state;
 262         struct inode *inode = exception->inode;
 263         int ret = errorcode;
 264
 265         exception->retry = 0;
 266         switch(errorcode) {
 267                 case 0:
 268                         return 0;
 269                 case -NFS4ERR_OPENMODE:
 270                         if (inode && nfs_have_delegation(inode, FMODE_READ)) {
 271                                 nfs_inode_return_delegation(inode);
 272                                 exception->retry = 1;
 273                                 return 0;
 274                         }
 275                         if (state == NULL)
 276                                 break;
 277                         nfs4_schedule_stateid_recovery(server, state);
 278                         goto wait_on_recovery;
 279                 case -NFS4ERR_DELEG_REVOKED:
 280                 case -NFS4ERR_ADMIN_REVOKED:
 281                 case -NFS4ERR_BAD_STATEID:
 282                         if (state == NULL)
 283                                 break;
 284                         nfs_remove_bad_delegation(state->inode);
 285                         nfs4_schedule_stateid_recovery(server, state);
 286                         goto wait_on_recovery;
 287                 case -NFS4ERR_EXPIRED:
 288                         if (state != NULL)
 289                                 nfs4_schedule_stateid_recovery(server, state);
 290                 case -NFS4ERR_STALE_STATEID:
 291                 case -NFS4ERR_STALE_CLIENTID:
 292                         nfs4_schedule_lease_recovery(clp);
 293                         goto wait_on_recovery;
 294 #if defined(CONFIG_NFS_V4_1)
 295                 case -NFS4ERR_BADSESSION:
 296                 case -NFS4ERR_BADSLOT:
 297                 case -NFS4ERR_BAD_HIGH_SLOT:
 298                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 299                 case -NFS4ERR_DEADSESSION:
 300                 case -NFS4ERR_SEQ_FALSE_RETRY:
 301                 case -NFS4ERR_SEQ_MISORDERED:
 302                         dprintk("%s ERROR: %d Reset session\n", __func__,
 303                                 errorcode);
 304                         nfs4_schedule_session_recovery(clp->cl_session);
 305                         goto wait_on_recovery;
 306 #endif /* defined(CONFIG_NFS_V4_1) */
 307                 case -NFS4ERR_FILE_OPEN:
 308                         if (exception->timeout > HZ) {
 309                                 /* We have retried a decent amount, time to
 310                                  * fail
 311                                  */
 312                                 ret = -EBUSY;
 313                                 break;
 314                         }
 315                 case -NFS4ERR_GRACE:
 316                 case -NFS4ERR_DELAY:
 317                 case -EKEYEXPIRED:
 318                         ret = nfs4_delay(server->client, &exception->timeout);
 319                         if (ret != 0)
 320                                 break;
 321                 case -NFS4ERR_RETRY_UNCACHED_REP:
 322                 case -NFS4ERR_OLD_STATEID:
 323                         exception->retry = 1;
 324                         break;
 325                 case -NFS4ERR_BADOWNER:
 326                         /* The following works around a Linux server bug! */
 327                 case -NFS4ERR_BADNAME:
 328                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 329                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 330                                 exception->retry = 1;
 331                                 printk(KERN_WARNING "NFS: v4 server %s "
 332                                                 "does not accept raw "
 333                                                 "uid/gids. "
 334                                                 "Reenabling the idmapper.\n",
 335                                                 server->nfs_client->cl_hostname);
 336                         }
 337         }
 338         /* We failed to handle the error */
 339         return nfs4_map_errors(ret);
 340 wait_on_recovery:
 341         ret = nfs4_wait_clnt_recover(clp);
 342         if (ret == 0)
 343                 exception->retry = 1;
 344         return ret;
 345 }
 346
 347
 348 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 349 {
 350         spin_lock(&clp->cl_lock);
 351         if (time_before(clp->cl_last_renewal,timestamp))
 352                 clp->cl_last_renewal = timestamp;
 353         spin_unlock(&clp->cl_lock);
 354 }
 355
 356 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 357 {
 358         do_renew_lease(server->nfs_client, timestamp);
 359 }
 360
 361 #if defined(CONFIG_NFS_V4_1)
 362
 363 /*
 364  * nfs4_free_slot - free a slot and efficiently update slot table.
 365  *
 366  * freeing a slot is trivially done by clearing its respective bit
 367  * in the bitmap.
 368  * If the freed slotid equals highest_used_slotid we want to update it
 369  * so that the server would be able to size down the slot table if needed,
 370  * otherwise we know that the highest_used_slotid is still in use.
 371  * When updating highest_used_slotid there may be "holes" in the bitmap
 372  * so we need to scan down from highest_used_slotid to 0 looking for the now
 373  * highest slotid in use.
 374  * If none found, highest_used_slotid is set to -1.
 375  *
 376  * Must be called while holding tbl->slot_tbl_lock
 377  */
 378 static void
 379 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 380 {
 381         int free_slotid = free_slot - tbl->slots;
 382         int slotid = free_slotid;
 383
 384         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 385         /* clear used bit in bitmap */
 386         __clear_bit(slotid, tbl->used_slots);
 387
 388         /* update highest_used_slotid when it is freed */
 389         if (slotid == tbl->highest_used_slotid) {
 390                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 391                 if (slotid < tbl->max_slots)
 392                         tbl->highest_used_slotid = slotid;
 393                 else
 394                         tbl->highest_used_slotid = -1;
 395         }
 396         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 397                 free_slotid, tbl->highest_used_slotid);
 398 }
 399
 400 /*
 401  * Signal state manager thread if session fore channel is drained
 402  */
 403 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 404 {
 405         struct rpc_task *task;
 406
 407         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 408                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 409                 if (task)
 410                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 411                 return;
 412         }
 413
 414         if (ses->fc_slot_table.highest_used_slotid != -1)
 415                 return;
 416
 417         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 418         complete(&ses->fc_slot_table.complete);
 419 }
 420
 421 /*
 422  * Signal state manager thread if session back channel is drained
 423  */
 424 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 425 {
 426         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 427             ses->bc_slot_table.highest_used_slotid != -1)
 428                 return;
 429         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 430         complete(&ses->bc_slot_table.complete);
 431 }
 432
 433 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 434 {
 435         struct nfs4_slot_table *tbl;
 436
 437         tbl = &res->sr_session->fc_slot_table;
 438         if (!res->sr_slot) {
 439                 /* just wake up the next guy waiting since
 440                  * we may have not consumed a slot after all */
 441                 dprintk("%s: No slot\n", __func__);
 442                 return;
 443         }
 444
 445         spin_lock(&tbl->slot_tbl_lock);
 446         nfs4_free_slot(tbl, res->sr_slot);
 447         nfs4_check_drain_fc_complete(res->sr_session);
 448         spin_unlock(&tbl->slot_tbl_lock);
 449         res->sr_slot = NULL;
 450 }
 451
 452 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 453 {
 454         unsigned long timestamp;
 455         struct nfs_client *clp;
 456
 457         /*
 458          * sr_status remains 1 if an RPC level error occurred. The server
 459          * may or may not have processed the sequence operation..
 460          * Proceed as if the server received and processed the sequence
 461          * operation.
 462          */
 463         if (res->sr_status == 1)
 464                 res->sr_status = NFS_OK;
 465
 466         /* don't increment the sequence number if the task wasn't sent */
 467         if (!RPC_WAS_SENT(task))
 468                 goto out;
 469
 470         /* Check the SEQUENCE operation status */
 471         switch (res->sr_status) {
 472         case 0:
 473                 /* Update the slot's sequence and clientid lease timer */
 474                 ++res->sr_slot->seq_nr;
 475                 timestamp = res->sr_renewal_time;
 476                 clp = res->sr_session->clp;
 477                 do_renew_lease(clp, timestamp);
 478                 /* Check sequence flags */
 479                 if (res->sr_status_flags != 0)
 480                         nfs4_schedule_lease_recovery(clp);
 481                 break;
 482         case -NFS4ERR_DELAY:
 483                 /* The server detected a resend of the RPC call and
 484                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 485                  * of RFC5661.
 486                  */
 487                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 488                         __func__,
 489                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 490                         res->sr_slot->seq_nr);
 491                 goto out_retry;
 492         default:
 493                 /* Just update the slot sequence no. */
 494                 ++res->sr_slot->seq_nr;
 495         }
 496 out:
 497         /* The session may be reset by one of the error handlers. */
 498         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 499         nfs41_sequence_free_slot(res);
 500         return 1;
 501 out_retry:
 502         if (!rpc_restart_call(task))
 503                 goto out;
 504         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 505         return 0;
 506 }
 507
 508 static int nfs4_sequence_done(struct rpc_task *task,
 509                                struct nfs4_sequence_res *res)
 510 {
 511         if (res->sr_session == NULL)
 512                 return 1;
 513         return nfs41_sequence_done(task, res);
 514 }
 515
 516 /*
 517  * nfs4_find_slot - efficiently look for a free slot
 518  *
 519  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 520  * If found, we mark the slot as used, update the highest_used_slotid,
 521  * and respectively set up the sequence operation args.
 522  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 523  *
 524  * Note: must be called with under the slot_tbl_lock.
 525  */
 526 static u8
 527 nfs4_find_slot(struct nfs4_slot_table *tbl)
 528 {
 529         int slotid;
 530         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 531         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 532
 533         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 534                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 535                 tbl->max_slots);
 536         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 537         if (slotid >= tbl->max_slots)
 538                 goto out;
 539         __set_bit(slotid, tbl->used_slots);
 540         if (slotid > tbl->highest_used_slotid)
 541                 tbl->highest_used_slotid = slotid;
 542         ret_id = slotid;
 543 out:
 544         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 545                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 546         return ret_id;
 547 }
 548
 549 int nfs41_setup_sequence(struct nfs4_session *session,
 550                                 struct nfs4_sequence_args *args,
 551                                 struct nfs4_sequence_res *res,
 552                                 int cache_reply,
 553                                 struct rpc_task *task)
 554 {
 555         struct nfs4_slot *slot;
 556         struct nfs4_slot_table *tbl;
 557         u8 slotid;
 558
 559         dprintk("--> %s\n", __func__);
 560         /* slot already allocated? */
 561         if (res->sr_slot != NULL)
 562                 return 0;
 563
 564         tbl = &session->fc_slot_table;
 565
 566         spin_lock(&tbl->slot_tbl_lock);
 567         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 568             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 569                 /*
 570                  * The state manager will wait until the slot table is empty.
 571                  * Schedule the reset thread
 572                  */
 573                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 574                 spin_unlock(&tbl->slot_tbl_lock);
 575                 dprintk("%s Schedule Session Reset\n", __func__);
 576                 return -EAGAIN;
 577         }
 578
 579         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 580             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 581                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 582                 spin_unlock(&tbl->slot_tbl_lock);
 583                 dprintk("%s enforce FIFO order\n", __func__);
 584                 return -EAGAIN;
 585         }
 586
 587         slotid = nfs4_find_slot(tbl);
 588         if (slotid == NFS4_MAX_SLOT_TABLE) {
 589                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 590                 spin_unlock(&tbl->slot_tbl_lock);
 591                 dprintk("<-- %s: no free slots\n", __func__);
 592                 return -EAGAIN;
 593         }
 594         spin_unlock(&tbl->slot_tbl_lock);
 595
 596         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 597         slot = tbl->slots + slotid;
 598         args->sa_session = session;
 599         args->sa_slotid = slotid;
 600         args->sa_cache_this = cache_reply;
 601
 602         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 603
 604         res->sr_session = session;
 605         res->sr_slot = slot;
 606         res->sr_renewal_time = jiffies;
 607         res->sr_status_flags = 0;
 608         /*
 609          * sr_status is only set in decode_sequence, and so will remain
 610          * set to 1 if an rpc level failure occurs.
 611          */
 612         res->sr_status = 1;
 613         return 0;
 614 }
 615 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 616
 617 int nfs4_setup_sequence(const struct nfs_server *server,
 618                         struct nfs4_sequence_args *args,
 619                         struct nfs4_sequence_res *res,
 620                         int cache_reply,
 621                         struct rpc_task *task)
 622 {
 623         struct nfs4_session *session = nfs4_get_session(server);
 624         int ret = 0;
 625
 626         if (session == NULL) {
 627                 args->sa_session = NULL;
 628                 res->sr_session = NULL;
 629                 goto out;
 630         }
 631
 632         dprintk("--> %s clp %p session %p sr_slot %td\n",
 633                 __func__, session->clp, session, res->sr_slot ?
 634                         res->sr_slot - session->fc_slot_table.slots : -1);
 635
 636         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 637                                    task);
 638 out:
 639         dprintk("<-- %s status=%d\n", __func__, ret);
 640         return ret;
 641 }
 642
 643 struct nfs41_call_sync_data {
 644         const struct nfs_server *seq_server;
 645         struct nfs4_sequence_args *seq_args;
 646         struct nfs4_sequence_res *seq_res;
 647         int cache_reply;
 648 };
 649
 650 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 651 {
 652         struct nfs41_call_sync_data *data = calldata;
 653
 654         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 655
 656         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 657                                 data->seq_res, data->cache_reply, task))
 658                 return;
 659         rpc_call_start(task);
 660 }
 661
 662 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 663 {
 664         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 665         nfs41_call_sync_prepare(task, calldata);
 666 }
 667
 668 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 669 {
 670         struct nfs41_call_sync_data *data = calldata;
 671
 672         nfs41_sequence_done(task, data->seq_res);
 673 }
 674
 675 struct rpc_call_ops nfs41_call_sync_ops = {
 676         .rpc_call_prepare = nfs41_call_sync_prepare,
 677         .rpc_call_done = nfs41_call_sync_done,
 678 };
 679
 680 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 681         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 682         .rpc_call_done = nfs41_call_sync_done,
 683 };
 684
 685 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 686                                    struct nfs_server *server,
 687                                    struct rpc_message *msg,
 688                                    struct nfs4_sequence_args *args,
 689                                    struct nfs4_sequence_res *res,
 690                                    int cache_reply,
 691                                    int privileged)
 692 {
 693         int ret;
 694         struct rpc_task *task;
 695         struct nfs41_call_sync_data data = {
 696                 .seq_server = server,
 697                 .seq_args = args,
 698                 .seq_res = res,
 699                 .cache_reply = cache_reply,
 700         };
 701         struct rpc_task_setup task_setup = {
 702                 .rpc_client = clnt,
 703                 .rpc_message = msg,
 704                 .callback_ops = &nfs41_call_sync_ops,
 705                 .callback_data = &data
 706         };
 707
 708         res->sr_slot = NULL;
 709         if (privileged)
 710                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 711         task = rpc_run_task(&task_setup);
 712         if (IS_ERR(task))
 713                 ret = PTR_ERR(task);
 714         else {
 715                 ret = task->tk_status;
 716                 rpc_put_task(task);
 717         }
 718         return ret;
 719 }
 720
 721 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 722                             struct nfs_server *server,
 723                             struct rpc_message *msg,
 724                             struct nfs4_sequence_args *args,
 725                             struct nfs4_sequence_res *res,
 726                             int cache_reply)
 727 {
 728         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 729 }
 730
 731 #else
 732 static int nfs4_sequence_done(struct rpc_task *task,
 733                                struct nfs4_sequence_res *res)
 734 {
 735         return 1;
 736 }
 737 #endif /* CONFIG_NFS_V4_1 */
 738
 739 int _nfs4_call_sync(struct rpc_clnt *clnt,
 740                     struct nfs_server *server,
 741                     struct rpc_message *msg,
 742                     struct nfs4_sequence_args *args,
 743                     struct nfs4_sequence_res *res,
 744                     int cache_reply)
 745 {
 746         args->sa_session = res->sr_session = NULL;
 747         return rpc_call_sync(clnt, msg, 0);
 748 }
 749
 750 static inline
 751 int nfs4_call_sync(struct rpc_clnt *clnt,
 752                    struct nfs_server *server,
 753                    struct rpc_message *msg,
 754                    struct nfs4_sequence_args *args,
 755                    struct nfs4_sequence_res *res,
 756                    int cache_reply)
 757 {
 758         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 759                                                 args, res, cache_reply);
 760 }
 761
 762 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 763 {
 764         struct nfs_inode *nfsi = NFS_I(dir);
 765
 766         spin_lock(&dir->i_lock);
 767         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 768         if (!cinfo->atomic || cinfo->before != dir->i_version)
 769                 nfs_force_lookup_revalidate(dir);
 770         dir->i_version = cinfo->after;
 771         spin_unlock(&dir->i_lock);
 772 }
 773
 774 struct nfs4_opendata {
 775         struct kref kref;
 776         struct nfs_openargs o_arg;
 777         struct nfs_openres o_res;
 778         struct nfs_open_confirmargs c_arg;
 779         struct nfs_open_confirmres c_res;
 780         struct nfs_fattr f_attr;
 781         struct nfs_fattr dir_attr;
 782         struct dentry *dir;
 783         struct dentry *dentry;
 784         struct nfs4_state_owner *owner;
 785         struct nfs4_state *state;
 786         struct iattr attrs;
 787         unsigned long timestamp;
 788         unsigned int rpc_done : 1;
 789         int rpc_status;
 790         int cancelled;
 791 };
 792
 793
 794 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 795 {
 796         p->o_res.f_attr = &p->f_attr;
 797         p->o_res.dir_attr = &p->dir_attr;
 798         p->o_res.seqid = p->o_arg.seqid;
 799         p->c_res.seqid = p->c_arg.seqid;
 800         p->o_res.server = p->o_arg.server;
 801         nfs_fattr_init(&p->f_attr);
 802         nfs_fattr_init(&p->dir_attr);
 803 }
 804
 805 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 806                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 807                 const struct iattr *attrs,
 808                 gfp_t gfp_mask)
 809 {
 810         struct dentry *parent = dget_parent(dentry);
 811         struct inode *dir = parent->d_inode;
 812         struct nfs_server *server = NFS_SERVER(dir);
 813         struct nfs4_opendata *p;
 814
 815         p = kzalloc(sizeof(*p), gfp_mask);
 816         if (p == NULL)
 817                 goto err;
 818         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 819         if (p->o_arg.seqid == NULL)
 820                 goto err_free;
 821         nfs_sb_active(dentry->d_sb);
 822         p->dentry = dget(dentry);
 823         p->dir = parent;
 824         p->owner = sp;
 825         atomic_inc(&sp->so_count);
 826         p->o_arg.fh = NFS_FH(dir);
 827         p->o_arg.open_flags = flags;
 828         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 829         p->o_arg.clientid = server->nfs_client->cl_clientid;
 830         p->o_arg.id = sp->so_owner_id.id;
 831         p->o_arg.name = &dentry->d_name;
 832         p->o_arg.server = server;
 833         p->o_arg.bitmask = server->attr_bitmask;
 834         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 835         if (flags & O_CREAT) {
 836                 u32 *s;
 837
 838                 p->o_arg.u.attrs = &p->attrs;
 839                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 840                 s = (u32 *) p->o_arg.u.verifier.data;
 841                 s[0] = jiffies;
 842                 s[1] = current->pid;
 843         }
 844         p->c_arg.fh = &p->o_res.fh;
 845         p->c_arg.stateid = &p->o_res.stateid;
 846         p->c_arg.seqid = p->o_arg.seqid;
 847         nfs4_init_opendata_res(p);
 848         kref_init(&p->kref);
 849         return p;
 850 err_free:
 851         kfree(p);
 852 err:
 853         dput(parent);
 854         return NULL;
 855 }
 856
 857 static void nfs4_opendata_free(struct kref *kref)
 858 {
 859         struct nfs4_opendata *p = container_of(kref,
 860                         struct nfs4_opendata, kref);
 861         struct super_block *sb = p->dentry->d_sb;
 862
 863         nfs_free_seqid(p->o_arg.seqid);
 864         if (p->state != NULL)
 865                 nfs4_put_open_state(p->state);
 866         nfs4_put_state_owner(p->owner);
 867         dput(p->dir);
 868         dput(p->dentry);
 869         nfs_sb_deactive(sb);
 870         kfree(p);
 871 }
 872
 873 static void nfs4_opendata_put(struct nfs4_opendata *p)
 874 {
 875         if (p != NULL)
 876                 kref_put(&p->kref, nfs4_opendata_free);
 877 }
 878
 879 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 880 {
 881         int ret;
 882
 883         ret = rpc_wait_for_completion_task(task);
 884         return ret;
 885 }
 886
 887 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 888 {
 889         int ret = 0;
 890
 891         if (open_mode & O_EXCL)
 892                 goto out;
 893         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 894                 case FMODE_READ:
 895                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 896                                 && state->n_rdonly != 0;
 897                         break;
 898                 case FMODE_WRITE:
 899                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 900                                 && state->n_wronly != 0;
 901                         break;
 902                 case FMODE_READ|FMODE_WRITE:
 903                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 904                                 && state->n_rdwr != 0;
 905         }
 906 out:
 907         return ret;
 908 }
 909
 910 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 911 {
 912         if (delegation == NULL)
 913                 return 0;
 914         if ((delegation->type & fmode) != fmode)
 915                 return 0;
 916         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 917                 return 0;
 918         nfs_mark_delegation_referenced(delegation);
 919         return 1;
 920 }
 921
 922 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 923 {
 924         switch (fmode) {
 925                 case FMODE_WRITE:
 926                         state->n_wronly++;
 927                         break;
 928                 case FMODE_READ:
 929                         state->n_rdonly++;
 930                         break;
 931                 case FMODE_READ|FMODE_WRITE:
 932                         state->n_rdwr++;
 933         }
 934         nfs4_state_set_mode_locked(state, state->state | fmode);
 935 }
 936
 937 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 938 {
 939         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 940                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 941         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 942         switch (fmode) {
 943                 case FMODE_READ:
 944                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 945                         break;
 946                 case FMODE_WRITE:
 947                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 948                         break;
 949                 case FMODE_READ|FMODE_WRITE:
 950                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 951         }
 952 }
 953
 954 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 955 {
 956         write_seqlock(&state->seqlock);
 957         nfs_set_open_stateid_locked(state, stateid, fmode);
 958         write_sequnlock(&state->seqlock);
 959 }
 960
 961 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 962 {
 963         /*
 964          * Protect the call to nfs4_state_set_mode_locked and
 965          * serialise the stateid update
 966          */
 967         write_seqlock(&state->seqlock);
 968         if (deleg_stateid != NULL) {
 969                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 970                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 971         }
 972         if (open_stateid != NULL)
 973                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 974         write_sequnlock(&state->seqlock);
 975         spin_lock(&state->owner->so_lock);
 976         update_open_stateflags(state, fmode);
 977         spin_unlock(&state->owner->so_lock);
 978 }
 979
 980 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 981 {
 982         struct nfs_inode *nfsi = NFS_I(state->inode);
 983         struct nfs_delegation *deleg_cur;
 984         int ret = 0;
 985
 986         fmode &= (FMODE_READ|FMODE_WRITE);
 987
 988         rcu_read_lock();
 989         deleg_cur = rcu_dereference(nfsi->delegation);
 990         if (deleg_cur == NULL)
 991                 goto no_delegation;
 992
 993         spin_lock(&deleg_cur->lock);
 994         if (nfsi->delegation != deleg_cur ||
 995             (deleg_cur->type & fmode) != fmode)
 996                 goto no_delegation_unlock;
 997
 998         if (delegation == NULL)
 999                 delegation = &deleg_cur->stateid;
1000         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
1001                 goto no_delegation_unlock;
1002
1003         nfs_mark_delegation_referenced(deleg_cur);
1004         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1005         ret = 1;
1006 no_delegation_unlock:
1007         spin_unlock(&deleg_cur->lock);
1008 no_delegation:
1009         rcu_read_unlock();
1010
1011         if (!ret && open_stateid != NULL) {
1012                 __update_open_stateid(state, open_stateid, NULL, fmode);
1013                 ret = 1;
1014         }
1015
1016         return ret;
1017 }
1018
1019
1020 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1021 {
1022         struct nfs_delegation *delegation;
1023
1024         rcu_read_lock();
1025         delegation = rcu_dereference(NFS_I(inode)->delegation);
1026         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1027                 rcu_read_unlock();
1028                 return;
1029         }
1030         rcu_read_unlock();
1031         nfs_inode_return_delegation(inode);
1032 }
1033
1034 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1035 {
1036         struct nfs4_state *state = opendata->state;
1037         struct nfs_inode *nfsi = NFS_I(state->inode);
1038         struct nfs_delegation *delegation;
1039         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1040         fmode_t fmode = opendata->o_arg.fmode;
1041         nfs4_stateid stateid;
1042         int ret = -EAGAIN;
1043
1044         for (;;) {
1045                 if (can_open_cached(state, fmode, open_mode)) {
1046                         spin_lock(&state->owner->so_lock);
1047                         if (can_open_cached(state, fmode, open_mode)) {
1048                                 update_open_stateflags(state, fmode);
1049                                 spin_unlock(&state->owner->so_lock);
1050                                 goto out_return_state;
1051                         }
1052                         spin_unlock(&state->owner->so_lock);
1053                 }
1054                 rcu_read_lock();
1055                 delegation = rcu_dereference(nfsi->delegation);
1056                 if (!can_open_delegated(delegation, fmode)) {
1057                         rcu_read_unlock();
1058                         break;
1059                 }
1060                 /* Save the delegation */
1061                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1062                 rcu_read_unlock();
1063                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1064                 if (ret != 0)
1065                         goto out;
1066                 ret = -EAGAIN;
1067
1068                 /* Try to update the stateid using the delegation */
1069                 if (update_open_stateid(state, NULL, &stateid, fmode))
1070                         goto out_return_state;
1071         }
1072 out:
1073         return ERR_PTR(ret);
1074 out_return_state:
1075         atomic_inc(&state->count);
1076         return state;
1077 }
1078
1079 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1080 {
1081         struct inode *inode;
1082         struct nfs4_state *state = NULL;
1083         struct nfs_delegation *delegation;
1084         int ret;
1085
1086         if (!data->rpc_done) {
1087                 state = nfs4_try_open_cached(data);
1088                 goto out;
1089         }
1090
1091         ret = -EAGAIN;
1092         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1093                 goto err;
1094         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1095         ret = PTR_ERR(inode);
1096         if (IS_ERR(inode))
1097                 goto err;
1098         ret = -ENOMEM;
1099         state = nfs4_get_open_state(inode, data->owner);
1100         if (state == NULL)
1101                 goto err_put_inode;
1102         if (data->o_res.delegation_type != 0) {
1103                 int delegation_flags = 0;
1104
1105                 rcu_read_lock();
1106                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1107                 if (delegation)
1108                         delegation_flags = delegation->flags;
1109                 rcu_read_unlock();
1110                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1111                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1112                                         "returning a delegation for "
1113                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1114                                         NFS_CLIENT(inode)->cl_server);
1115                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1116                         nfs_inode_set_delegation(state->inode,
1117                                         data->owner->so_cred,
1118                                         &data->o_res);
1119                 else
1120                         nfs_inode_reclaim_delegation(state->inode,
1121                                         data->owner->so_cred,
1122                                         &data->o_res);
1123         }
1124
1125         update_open_stateid(state, &data->o_res.stateid, NULL,
1126                         data->o_arg.fmode);
1127         iput(inode);
1128 out:
1129         return state;
1130 err_put_inode:
1131         iput(inode);
1132 err:
1133         return ERR_PTR(ret);
1134 }
1135
1136 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1137 {
1138         struct nfs_inode *nfsi = NFS_I(state->inode);
1139         struct nfs_open_context *ctx;
1140
1141         spin_lock(&state->inode->i_lock);
1142         list_for_each_entry(ctx, &nfsi->open_files, list) {
1143                 if (ctx->state != state)
1144                         continue;
1145                 get_nfs_open_context(ctx);
1146                 spin_unlock(&state->inode->i_lock);
1147                 return ctx;
1148         }
1149         spin_unlock(&state->inode->i_lock);
1150         return ERR_PTR(-ENOENT);
1151 }
1152
1153 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1154 {
1155         struct nfs4_opendata *opendata;
1156
1157         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1158         if (opendata == NULL)
1159                 return ERR_PTR(-ENOMEM);
1160         opendata->state = state;
1161         atomic_inc(&state->count);
1162         return opendata;
1163 }
1164
1165 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1166 {
1167         struct nfs4_state *newstate;
1168         int ret;
1169
1170         opendata->o_arg.open_flags = 0;
1171         opendata->o_arg.fmode = fmode;
1172         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1173         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1174         nfs4_init_opendata_res(opendata);
1175         ret = _nfs4_recover_proc_open(opendata);
1176         if (ret != 0)
1177                 return ret;
1178         newstate = nfs4_opendata_to_nfs4_state(opendata);
1179         if (IS_ERR(newstate))
1180                 return PTR_ERR(newstate);
1181         nfs4_close_state(newstate, fmode);
1182         *res = newstate;
1183         return 0;
1184 }
1185
1186 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1187 {
1188         struct nfs4_state *newstate;
1189         int ret;
1190
1191         /* memory barrier prior to reading state->n_* */
1192         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1193         smp_rmb();
1194         if (state->n_rdwr != 0) {
1195                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1196                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1197                 if (ret != 0)
1198                         return ret;
1199                 if (newstate != state)
1200                         return -ESTALE;
1201         }
1202         if (state->n_wronly != 0) {
1203                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1204                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1205                 if (ret != 0)
1206                         return ret;
1207                 if (newstate != state)
1208                         return -ESTALE;
1209         }
1210         if (state->n_rdonly != 0) {
1211                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1212                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1213                 if (ret != 0)
1214                         return ret;
1215                 if (newstate != state)
1216                         return -ESTALE;
1217         }
1218         /*
1219          * We may have performed cached opens for all three recoveries.
1220          * Check if we need to update the current stateid.
1221          */
1222         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1223             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1224                 write_seqlock(&state->seqlock);
1225                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1226                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1227                 write_sequnlock(&state->seqlock);
1228         }
1229         return 0;
1230 }
1231
1232 /*
1233  * OPEN_RECLAIM:
1234  *      reclaim state on the server after a reboot.
1235  */
1236 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1237 {
1238         struct nfs_delegation *delegation;
1239         struct nfs4_opendata *opendata;
1240         fmode_t delegation_type = 0;
1241         int status;
1242
1243         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1244         if (IS_ERR(opendata))
1245                 return PTR_ERR(opendata);
1246         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1247         opendata->o_arg.fh = NFS_FH(state->inode);
1248         rcu_read_lock();
1249         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1250         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1251                 delegation_type = delegation->type;
1252         rcu_read_unlock();
1253         opendata->o_arg.u.delegation_type = delegation_type;
1254         status = nfs4_open_recover(opendata, state);
1255         nfs4_opendata_put(opendata);
1256         return status;
1257 }
1258
1259 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1260 {
1261         struct nfs_server *server = NFS_SERVER(state->inode);
1262         struct nfs4_exception exception = { };
1263         int err;
1264         do {
1265                 err = _nfs4_do_open_reclaim(ctx, state);
1266                 if (err != -NFS4ERR_DELAY)
1267                         break;
1268                 nfs4_handle_exception(server, err, &exception);
1269         } while (exception.retry);
1270         return err;
1271 }
1272
1273 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1274 {
1275         struct nfs_open_context *ctx;
1276         int ret;
1277
1278         ctx = nfs4_state_find_open_context(state);
1279         if (IS_ERR(ctx))
1280                 return PTR_ERR(ctx);
1281         ret = nfs4_do_open_reclaim(ctx, state);
1282         put_nfs_open_context(ctx);
1283         return ret;
1284 }
1285
1286 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1287 {
1288         struct nfs4_opendata *opendata;
1289         int ret;
1290
1291         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1292         if (IS_ERR(opendata))
1293                 return PTR_ERR(opendata);
1294         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1295         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1296                         sizeof(opendata->o_arg.u.delegation.data));
1297         ret = nfs4_open_recover(opendata, state);
1298         nfs4_opendata_put(opendata);
1299         return ret;
1300 }
1301
1302 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1303 {
1304         struct nfs4_exception exception = { };
1305         struct nfs_server *server = NFS_SERVER(state->inode);
1306         int err;
1307         do {
1308                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1309                 switch (err) {
1310                         case 0:
1311                         case -ENOENT:
1312                         case -ESTALE:
1313                                 goto out;
1314                         case -NFS4ERR_BADSESSION:
1315                         case -NFS4ERR_BADSLOT:
1316                         case -NFS4ERR_BAD_HIGH_SLOT:
1317                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1318                         case -NFS4ERR_DEADSESSION:
1319                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1320                                 goto out;
1321                         case -NFS4ERR_STALE_CLIENTID:
1322                         case -NFS4ERR_STALE_STATEID:
1323                         case -NFS4ERR_EXPIRED:
1324                                 /* Don't recall a delegation if it was lost */
1325                                 nfs4_schedule_lease_recovery(server->nfs_client);
1326                                 goto out;
1327                         case -ERESTARTSYS:
1328                                 /*
1329                                  * The show must go on: exit, but mark the
1330                                  * stateid as needing recovery.
1331                                  */
1332                         case -NFS4ERR_DELEG_REVOKED:
1333                         case -NFS4ERR_ADMIN_REVOKED:
1334                         case -NFS4ERR_BAD_STATEID:
1335                                 nfs_inode_find_state_and_recover(state->inode,
1336                                                 stateid);
1337                                 nfs4_schedule_stateid_recovery(server, state);
1338                         case -EKEYEXPIRED:
1339                                 /*
1340                                  * User RPCSEC_GSS context has expired.
1341                                  * We cannot recover this stateid now, so
1342                                  * skip it and allow recovery thread to
1343                                  * proceed.
1344                                  */
1345                         case -ENOMEM:
1346                                 err = 0;
1347                                 goto out;
1348                 }
1349                 err = nfs4_handle_exception(server, err, &exception);
1350         } while (exception.retry);
1351 out:
1352         return err;
1353 }
1354
1355 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1356 {
1357         struct nfs4_opendata *data = calldata;
1358
1359         data->rpc_status = task->tk_status;
1360         if (data->rpc_status == 0) {
1361                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1362                                 sizeof(data->o_res.stateid.data));
1363                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1364                 renew_lease(data->o_res.server, data->timestamp);
1365                 data->rpc_done = 1;
1366         }
1367 }
1368
1369 static void nfs4_open_confirm_release(void *calldata)
1370 {
1371         struct nfs4_opendata *data = calldata;
1372         struct nfs4_state *state = NULL;
1373
1374         /* If this request hasn't been cancelled, do nothing */
1375         if (data->cancelled == 0)
1376                 goto out_free;
1377         /* In case of error, no cleanup! */
1378         if (!data->rpc_done)
1379                 goto out_free;
1380         state = nfs4_opendata_to_nfs4_state(data);
1381         if (!IS_ERR(state))
1382                 nfs4_close_state(state, data->o_arg.fmode);
1383 out_free:
1384         nfs4_opendata_put(data);
1385 }
1386
1387 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1388         .rpc_call_done = nfs4_open_confirm_done,
1389         .rpc_release = nfs4_open_confirm_release,
1390 };
1391
1392 /*
1393  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1394  */
1395 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1396 {
1397         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1398         struct rpc_task *task;
1399         struct  rpc_message msg = {
1400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1401                 .rpc_argp = &data->c_arg,
1402                 .rpc_resp = &data->c_res,
1403                 .rpc_cred = data->owner->so_cred,
1404         };
1405         struct rpc_task_setup task_setup_data = {
1406                 .rpc_client = server->client,
1407                 .rpc_message = &msg,
1408                 .callback_ops = &nfs4_open_confirm_ops,
1409                 .callback_data = data,
1410                 .workqueue = nfsiod_workqueue,
1411                 .flags = RPC_TASK_ASYNC,
1412         };
1413         int status;
1414
1415         kref_get(&data->kref);
1416         data->rpc_done = 0;
1417         data->rpc_status = 0;
1418         data->timestamp = jiffies;
1419         task = rpc_run_task(&task_setup_data);
1420         if (IS_ERR(task))
1421                 return PTR_ERR(task);
1422         status = nfs4_wait_for_completion_rpc_task(task);
1423         if (status != 0) {
1424                 data->cancelled = 1;
1425                 smp_wmb();
1426         } else
1427                 status = data->rpc_status;
1428         rpc_put_task(task);
1429         return status;
1430 }
1431
1432 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1433 {
1434         struct nfs4_opendata *data = calldata;
1435         struct nfs4_state_owner *sp = data->owner;
1436
1437         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1438                 return;
1439         /*
1440          * Check if we still need to send an OPEN call, or if we can use
1441          * a delegation instead.
1442          */
1443         if (data->state != NULL) {
1444                 struct nfs_delegation *delegation;
1445
1446                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1447                         goto out_no_action;
1448                 rcu_read_lock();
1449                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1450                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1451                     can_open_delegated(delegation, data->o_arg.fmode))
1452                         goto unlock_no_action;
1453                 rcu_read_unlock();
1454         }
1455         /* Update sequence id. */
1456         data->o_arg.id = sp->so_owner_id.id;
1457         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1458         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1459                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1460                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1461         }
1462         data->timestamp = jiffies;
1463         if (nfs4_setup_sequence(data->o_arg.server,
1464                                 &data->o_arg.seq_args,
1465                                 &data->o_res.seq_res,
1466                                 1, task) != 0)
1467                 nfs_release_seqid(data->o_arg.seqid);
1468         else
1469                 rpc_call_start(task);
1470         return;
1471 unlock_no_action:
1472         rcu_read_unlock();
1473 out_no_action:
1474         task->tk_action = NULL;
1475
1476 }
1477
1478 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1479 {
1480         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1481         nfs4_open_prepare(task, calldata);
1482 }
1483
1484 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1485 {
1486         struct nfs4_opendata *data = calldata;
1487
1488         data->rpc_status = task->tk_status;
1489
1490         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1491                 return;
1492
1493         if (task->tk_status == 0) {
1494                 switch (data->o_res.f_attr->mode & S_IFMT) {
1495                         case S_IFREG:
1496                                 break;
1497                         case S_IFLNK:
1498                                 data->rpc_status = -ELOOP;
1499                                 break;
1500                         case S_IFDIR:
1501                                 data->rpc_status = -EISDIR;
1502                                 break;
1503                         default:
1504                                 data->rpc_status = -ENOTDIR;
1505                 }
1506                 renew_lease(data->o_res.server, data->timestamp);
1507                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1508                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1509         }
1510         data->rpc_done = 1;
1511 }
1512
1513 static void nfs4_open_release(void *calldata)
1514 {
1515         struct nfs4_opendata *data = calldata;
1516         struct nfs4_state *state = NULL;
1517
1518         /* If this request hasn't been cancelled, do nothing */
1519         if (data->cancelled == 0)
1520                 goto out_free;
1521         /* In case of error, no cleanup! */
1522         if (data->rpc_status != 0 || !data->rpc_done)
1523                 goto out_free;
1524         /* In case we need an open_confirm, no cleanup! */
1525         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1526                 goto out_free;
1527         state = nfs4_opendata_to_nfs4_state(data);
1528         if (!IS_ERR(state))
1529                 nfs4_close_state(state, data->o_arg.fmode);
1530 out_free:
1531         nfs4_opendata_put(data);
1532 }
1533
1534 static const struct rpc_call_ops nfs4_open_ops = {
1535         .rpc_call_prepare = nfs4_open_prepare,
1536         .rpc_call_done = nfs4_open_done,
1537         .rpc_release = nfs4_open_release,
1538 };
1539
1540 static const struct rpc_call_ops nfs4_recover_open_ops = {
1541         .rpc_call_prepare = nfs4_recover_open_prepare,
1542         .rpc_call_done = nfs4_open_done,
1543         .rpc_release = nfs4_open_release,
1544 };
1545
1546 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1547 {
1548         struct inode *dir = data->dir->d_inode;
1549         struct nfs_server *server = NFS_SERVER(dir);
1550         struct nfs_openargs *o_arg = &data->o_arg;
1551         struct nfs_openres *o_res = &data->o_res;
1552         struct rpc_task *task;
1553         struct rpc_message msg = {
1554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1555                 .rpc_argp = o_arg,
1556                 .rpc_resp = o_res,
1557                 .rpc_cred = data->owner->so_cred,
1558         };
1559         struct rpc_task_setup task_setup_data = {
1560                 .rpc_client = server->client,
1561                 .rpc_message = &msg,
1562                 .callback_ops = &nfs4_open_ops,
1563                 .callback_data = data,
1564                 .workqueue = nfsiod_workqueue,
1565                 .flags = RPC_TASK_ASYNC,
1566         };
1567         int status;
1568
1569         kref_get(&data->kref);
1570         data->rpc_done = 0;
1571         data->rpc_status = 0;
1572         data->cancelled = 0;
1573         if (isrecover)
1574                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1575         task = rpc_run_task(&task_setup_data);
1576         if (IS_ERR(task))
1577                 return PTR_ERR(task);
1578         status = nfs4_wait_for_completion_rpc_task(task);
1579         if (status != 0) {
1580                 data->cancelled = 1;
1581                 smp_wmb();
1582         } else
1583                 status = data->rpc_status;
1584         rpc_put_task(task);
1585
1586         return status;
1587 }
1588
1589 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1590 {
1591         struct inode *dir = data->dir->d_inode;
1592         struct nfs_openres *o_res = &data->o_res;
1593         int status;
1594
1595         status = nfs4_run_open_task(data, 1);
1596         if (status != 0 || !data->rpc_done)
1597                 return status;
1598
1599         nfs_refresh_inode(dir, o_res->dir_attr);
1600
1601         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1602                 status = _nfs4_proc_open_confirm(data);
1603                 if (status != 0)
1604                         return status;
1605         }
1606
1607         return status;
1608 }
1609
1610 /*
1611  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1612  */
1613 static int _nfs4_proc_open(struct nfs4_opendata *data)
1614 {
1615         struct inode *dir = data->dir->d_inode;
1616         struct nfs_server *server = NFS_SERVER(dir);
1617         struct nfs_openargs *o_arg = &data->o_arg;
1618         struct nfs_openres *o_res = &data->o_res;
1619         int status;
1620
1621         status = nfs4_run_open_task(data, 0);
1622         if (!data->rpc_done)
1623                 return status;
1624         if (status != 0) {
1625                 if (status == -NFS4ERR_BADNAME &&
1626                                 !(o_arg->open_flags & O_CREAT))
1627                         return -ENOENT;
1628                 return status;
1629         }
1630
1631         if (o_arg->open_flags & O_CREAT) {
1632                 update_changeattr(dir, &o_res->cinfo);
1633                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1634         } else
1635                 nfs_refresh_inode(dir, o_res->dir_attr);
1636         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1637                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1638         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1639                 status = _nfs4_proc_open_confirm(data);
1640                 if (status != 0)
1641                         return status;
1642         }
1643         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1644                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1645         return 0;
1646 }
1647
1648 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1649 {
1650         unsigned int loop;
1651         int ret;
1652
1653         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1654                 ret = nfs4_wait_clnt_recover(clp);
1655                 if (ret != 0)
1656                         break;
1657                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1658                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1659                         break;
1660                 nfs4_schedule_state_manager(clp);
1661                 ret = -EIO;
1662         }
1663         return ret;
1664 }
1665
1666 static int nfs4_recover_expired_lease(struct nfs_server *server)
1667 {
1668         return nfs4_client_recover_expired_lease(server->nfs_client);
1669 }
1670
1671 /*
1672  * OPEN_EXPIRED:
1673  *      reclaim state on the server after a network partition.
1674  *      Assumes caller holds the appropriate lock
1675  */
1676 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1677 {
1678         struct nfs4_opendata *opendata;
1679         int ret;
1680
1681         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1682         if (IS_ERR(opendata))
1683                 return PTR_ERR(opendata);
1684         ret = nfs4_open_recover(opendata, state);
1685         if (ret == -ESTALE)
1686                 d_drop(ctx->dentry);
1687         nfs4_opendata_put(opendata);
1688         return ret;
1689 }
1690
1691 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1692 {
1693         struct nfs_server *server = NFS_SERVER(state->inode);
1694         struct nfs4_exception exception = { };
1695         int err;
1696
1697         do {
1698                 err = _nfs4_open_expired(ctx, state);
1699                 switch (err) {
1700                 default:
1701                         goto out;
1702                 case -NFS4ERR_GRACE:
1703                 case -NFS4ERR_DELAY:
1704                         nfs4_handle_exception(server, err, &exception);
1705                         err = 0;
1706                 }
1707         } while (exception.retry);
1708 out:
1709         return err;
1710 }
1711
1712 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1713 {
1714         struct nfs_open_context *ctx;
1715         int ret;
1716
1717         ctx = nfs4_state_find_open_context(state);
1718         if (IS_ERR(ctx))
1719                 return PTR_ERR(ctx);
1720         ret = nfs4_do_open_expired(ctx, state);
1721         put_nfs_open_context(ctx);
1722         return ret;
1723 }
1724
1725 #if defined(CONFIG_NFS_V4_1)
1726 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1727 {
1728         int status;
1729         struct nfs_server *server = NFS_SERVER(state->inode);
1730
1731         status = nfs41_test_stateid(server, state);
1732         if (status == NFS_OK)
1733                 return 0;
1734         nfs41_free_stateid(server, state);
1735         return nfs4_open_expired(sp, state);
1736 }
1737 #endif
1738
1739 /*
1740  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1741  * fields corresponding to attributes that were used to store the verifier.
1742  * Make sure we clobber those fields in the later setattr call
1743  */
1744 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1745 {
1746         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1747             !(sattr->ia_valid & ATTR_ATIME_SET))
1748                 sattr->ia_valid |= ATTR_ATIME;
1749
1750         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1751             !(sattr->ia_valid & ATTR_MTIME_SET))
1752                 sattr->ia_valid |= ATTR_MTIME;
1753 }
1754
1755 /*
1756  * Returns a referenced nfs4_state
1757  */
1758 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)
1759 {
1760         struct nfs4_state_owner  *sp;
1761         struct nfs4_state     *state = NULL;
1762         struct nfs_server       *server = NFS_SERVER(dir);
1763         struct nfs4_opendata *opendata;
1764         int status;
1765
1766         /* Protect against reboot recovery conflicts */
1767         status = -ENOMEM;
1768         if (!(sp = nfs4_get_state_owner(server, cred))) {
1769                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1770                 goto out_err;
1771         }
1772         status = nfs4_recover_expired_lease(server);
1773         if (status != 0)
1774                 goto err_put_state_owner;
1775         if (dentry->d_inode != NULL)
1776                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1777         status = -ENOMEM;
1778         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1779         if (opendata == NULL)
1780                 goto err_put_state_owner;
1781
1782         if (dentry->d_inode != NULL)
1783                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1784
1785         status = _nfs4_proc_open(opendata);
1786         if (status != 0)
1787                 goto err_opendata_put;
1788
1789         state = nfs4_opendata_to_nfs4_state(opendata);
1790         status = PTR_ERR(state);
1791         if (IS_ERR(state))
1792                 goto err_opendata_put;
1793         if (server->caps & NFS_CAP_POSIX_LOCK)
1794                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1795
1796         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) {
1797                 nfs4_exclusive_attrset(opendata, sattr);
1798
1799                 nfs_fattr_init(opendata->o_res.f_attr);
1800                 status = nfs4_do_setattr(state->inode, cred,
1801                                 opendata->o_res.f_attr, sattr,
1802                                 state);
1803                 if (status == 0)
1804                         nfs_setattr_update_inode(state->inode, sattr);
1805                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1806         }
1807         nfs_revalidate_inode(server, state->inode);
1808         nfs4_opendata_put(opendata);
1809         nfs4_put_state_owner(sp);
1810         *res = state;
1811         return 0;
1812 err_opendata_put:
1813         nfs4_opendata_put(opendata);
1814 err_put_state_owner:
1815         nfs4_put_state_owner(sp);
1816 out_err:
1817         *res = NULL;
1818         return status;
1819 }
1820
1821
1822 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)
1823 {
1824         struct nfs4_exception exception = { };
1825         struct nfs4_state *res;
1826         int status;
1827
1828         fmode &= FMODE_READ|FMODE_WRITE;
1829         do {
1830                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1831                 if (status == 0)
1832                         break;
1833                 /* NOTE: BAD_SEQID means the server and client disagree about the
1834                  * book-keeping w.r.t. state-changing operations
1835                  * (OPEN/CLOSE/LOCK/LOCKU...)
1836                  * It is actually a sign of a bug on the client or on the server.
1837                  *
1838                  * If we receive a BAD_SEQID error in the particular case of
1839                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1840                  * have unhashed the old state_owner for us, and that we can
1841                  * therefore safely retry using a new one. We should still warn
1842                  * the user though...
1843                  */
1844                 if (status == -NFS4ERR_BAD_SEQID) {
1845                         pr_warn_ratelimited("NFS: v4 server %s "
1846                                         " returned a bad sequence-id error!\n",
1847                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1848                         exception.retry = 1;
1849                         continue;
1850                 }
1851                 /*
1852                  * BAD_STATEID on OPEN means that the server cancelled our
1853                  * state before it received the OPEN_CONFIRM.
1854                  * Recover by retrying the request as per the discussion
1855                  * on Page 181 of RFC3530.
1856                  */
1857                 if (status == -NFS4ERR_BAD_STATEID) {
1858                         exception.retry = 1;
1859                         continue;
1860                 }
1861                 if (status == -EAGAIN) {
1862                         /* We must have found a delegation */
1863                         exception.retry = 1;
1864                         continue;
1865                 }
1866                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1867                                         status, &exception));
1868         } while (exception.retry);
1869         return res;
1870 }
1871
1872 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1873                             struct nfs_fattr *fattr, struct iattr *sattr,
1874                             struct nfs4_state *state)
1875 {
1876         struct nfs_server *server = NFS_SERVER(inode);
1877         struct nfs_setattrargs  arg = {
1878                 .fh             = NFS_FH(inode),
1879                 .iap            = sattr,
1880                 .server         = server,
1881                 .bitmask = server->attr_bitmask,
1882         };
1883         struct nfs_setattrres  res = {
1884                 .fattr          = fattr,
1885                 .server         = server,
1886         };
1887         struct rpc_message msg = {
1888                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1889                 .rpc_argp       = &arg,
1890                 .rpc_resp       = &res,
1891                 .rpc_cred       = cred,
1892         };
1893         unsigned long timestamp = jiffies;
1894         int status;
1895
1896         nfs_fattr_init(fattr);
1897
1898         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1899                 /* Use that stateid */
1900         } else if (state != NULL) {
1901                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1902         } else
1903                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1904
1905         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1906         if (status == 0 && state != NULL)
1907                 renew_lease(server, timestamp);
1908         return status;
1909 }
1910
1911 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1912                            struct nfs_fattr *fattr, struct iattr *sattr,
1913                            struct nfs4_state *state)
1914 {
1915         struct nfs_server *server = NFS_SERVER(inode);
1916         struct nfs4_exception exception = {
1917                 .state = state,
1918                 .inode = inode,
1919         };
1920         int err;
1921         do {
1922                 err = nfs4_handle_exception(server,
1923                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1924                                 &exception);
1925         } while (exception.retry);
1926         return err;
1927 }
1928
1929 struct nfs4_closedata {
1930         struct inode *inode;
1931         struct nfs4_state *state;
1932         struct nfs_closeargs arg;
1933         struct nfs_closeres res;
1934         struct nfs_fattr fattr;
1935         unsigned long timestamp;
1936         bool roc;
1937         u32 roc_barrier;
1938 };
1939
1940 static void nfs4_free_closedata(void *data)
1941 {
1942         struct nfs4_closedata *calldata = data;
1943         struct nfs4_state_owner *sp = calldata->state->owner;
1944         struct super_block *sb = calldata->state->inode->i_sb;
1945
1946         if (calldata->roc)
1947                 pnfs_roc_release(calldata->state->inode);
1948         nfs4_put_open_state(calldata->state);
1949         nfs_free_seqid(calldata->arg.seqid);
1950         nfs4_put_state_owner(sp);
1951         nfs_sb_deactive(sb);
1952         kfree(calldata);
1953 }
1954
1955 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1956                 fmode_t fmode)
1957 {
1958         spin_lock(&state->owner->so_lock);
1959         if (!(fmode & FMODE_READ))
1960                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1961         if (!(fmode & FMODE_WRITE))
1962                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1963         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1964         spin_unlock(&state->owner->so_lock);
1965 }
1966
1967 static void nfs4_close_done(struct rpc_task *task, void *data)
1968 {
1969         struct nfs4_closedata *calldata = data;
1970         struct nfs4_state *state = calldata->state;
1971         struct nfs_server *server = NFS_SERVER(calldata->inode);
1972
1973         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1974                 return;
1975         /* hmm. we are done with the inode, and in the process of freeing
1976          * the state_owner. we keep this around to process errors
1977          */
1978         switch (task->tk_status) {
1979                 case 0:
1980                         if (calldata->roc)
1981                                 pnfs_roc_set_barrier(state->inode,
1982                                                      calldata->roc_barrier);
1983                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1984                         renew_lease(server, calldata->timestamp);
1985                         nfs4_close_clear_stateid_flags(state,
1986                                         calldata->arg.fmode);
1987                         break;
1988                 case -NFS4ERR_STALE_STATEID:
1989                 case -NFS4ERR_OLD_STATEID:
1990                 case -NFS4ERR_BAD_STATEID:
1991                 case -NFS4ERR_EXPIRED:
1992                         if (calldata->arg.fmode == 0)
1993                                 break;
1994                 default:
1995                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1996                                 rpc_restart_call_prepare(task);
1997         }
1998         nfs_release_seqid(calldata->arg.seqid);
1999         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2000 }
2001
2002 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2003 {
2004         struct nfs4_closedata *calldata = data;
2005         struct nfs4_state *state = calldata->state;
2006         bool is_rdonly, is_wronly, is_rdwr;
2007         int call_close = 0;
2008
2009         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2010                 return;
2011
2012         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2013         spin_lock(&state->owner->so_lock);
2014         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2015         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2016         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2017         /* Calculate the change in open mode */
2018         calldata->arg.fmode = 0;
2019         if (state->n_rdwr == 0) {
2020                 if (state->n_rdonly == 0)
2021                         call_close |= is_rdonly;
2022                 else if (is_rdonly)
2023                         calldata->arg.fmode |= FMODE_READ;
2024                 if (state->n_wronly == 0)
2025                         call_close |= is_wronly;
2026                 else if (is_wronly)
2027                         calldata->arg.fmode |= FMODE_WRITE;
2028         } else if (is_rdwr)
2029                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2030
2031         if (calldata->arg.fmode == 0)
2032                 call_close |= is_rdwr;
2033
2034         spin_unlock(&state->owner->so_lock);
2035
2036         if (!call_close) {
2037                 /* Note: exit _without_ calling nfs4_close_done */
2038                 task->tk_action = NULL;
2039                 return;
2040         }
2041
2042         if (calldata->arg.fmode == 0) {
2043                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2044                 if (calldata->roc &&
2045                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2046                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2047                                      task, NULL);
2048                         return;
2049                 }
2050         }
2051
2052         nfs_fattr_init(calldata->res.fattr);
2053         calldata->timestamp = jiffies;
2054         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2055                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2056                                 1, task) != 0)
2057                 nfs_release_seqid(calldata->arg.seqid);
2058         else
2059                 rpc_call_start(task);
2060 }
2061
2062 static const struct rpc_call_ops nfs4_close_ops = {
2063         .rpc_call_prepare = nfs4_close_prepare,
2064         .rpc_call_done = nfs4_close_done,
2065         .rpc_release = nfs4_free_closedata,
2066 };
2067
2068 /*
2069  * It is possible for data to be read/written from a mem-mapped file
2070  * after the sys_close call (which hits the vfs layer as a flush).
2071  * This means that we can't safely call nfsv4 close on a file until
2072  * the inode is cleared. This in turn means that we are not good
2073  * NFSv4 citizens - we do not indicate to the server to update the file's
2074  * share state even when we are done with one of the three share
2075  * stateid's in the inode.
2076  *
2077  * NOTE: Caller must be holding the sp->so_owner semaphore!
2078  */
2079 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2080 {
2081         struct nfs_server *server = NFS_SERVER(state->inode);
2082         struct nfs4_closedata *calldata;
2083         struct nfs4_state_owner *sp = state->owner;
2084         struct rpc_task *task;
2085         struct rpc_message msg = {
2086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2087                 .rpc_cred = state->owner->so_cred,
2088         };
2089         struct rpc_task_setup task_setup_data = {
2090                 .rpc_client = server->client,
2091                 .rpc_message = &msg,
2092                 .callback_ops = &nfs4_close_ops,
2093                 .workqueue = nfsiod_workqueue,
2094                 .flags = RPC_TASK_ASYNC,
2095         };
2096         int status = -ENOMEM;
2097
2098         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2099         if (calldata == NULL)
2100                 goto out;
2101         calldata->inode = state->inode;
2102         calldata->state = state;
2103         calldata->arg.fh = NFS_FH(state->inode);
2104         calldata->arg.stateid = &state->open_stateid;
2105         /* Serialization for the sequence id */
2106         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2107         if (calldata->arg.seqid == NULL)
2108                 goto out_free_calldata;
2109         calldata->arg.fmode = 0;
2110         calldata->arg.bitmask = server->cache_consistency_bitmask;
2111         calldata->res.fattr = &calldata->fattr;
2112         calldata->res.seqid = calldata->arg.seqid;
2113         calldata->res.server = server;
2114         calldata->roc = roc;
2115         nfs_sb_active(calldata->inode->i_sb);
2116
2117         msg.rpc_argp = &calldata->arg;
2118         msg.rpc_resp = &calldata->res;
2119         task_setup_data.callback_data = calldata;
2120         task = rpc_run_task(&task_setup_data);
2121         if (IS_ERR(task))
2122                 return PTR_ERR(task);
2123         status = 0;
2124         if (wait)
2125                 status = rpc_wait_for_completion_task(task);
2126         rpc_put_task(task);
2127         return status;
2128 out_free_calldata:
2129         kfree(calldata);
2130 out:
2131         if (roc)
2132                 pnfs_roc_release(state->inode);
2133         nfs4_put_open_state(state);
2134         nfs4_put_state_owner(sp);
2135         return status;
2136 }
2137
2138 static struct inode *
2139 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2140 {
2141         struct nfs4_state *state;
2142
2143         /* Protect against concurrent sillydeletes */
2144         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2145         if (IS_ERR(state))
2146                 return ERR_CAST(state);
2147         ctx->state = state;
2148         return igrab(state->inode);
2149 }
2150
2151 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2152 {
2153         if (ctx->state == NULL)
2154                 return;
2155         if (is_sync)
2156                 nfs4_close_sync(ctx->state, ctx->mode);
2157         else
2158                 nfs4_close_state(ctx->state, ctx->mode);
2159 }
2160
2161 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2162 {
2163         struct nfs4_server_caps_arg args = {
2164                 .fhandle = fhandle,
2165         };
2166         struct nfs4_server_caps_res res = {};
2167         struct rpc_message msg = {
2168                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2169                 .rpc_argp = &args,
2170                 .rpc_resp = &res,
2171         };
2172         int status;
2173
2174         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2175         if (status == 0) {
2176                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2177                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2178                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2179                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2180                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2181                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2182                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2183                         server->caps |= NFS_CAP_ACLS;
2184                 if (res.has_links != 0)
2185                         server->caps |= NFS_CAP_HARDLINKS;
2186                 if (res.has_symlinks != 0)
2187                         server->caps |= NFS_CAP_SYMLINKS;
2188                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2189                         server->caps |= NFS_CAP_FILEID;
2190                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2191                         server->caps |= NFS_CAP_MODE;
2192                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2193                         server->caps |= NFS_CAP_NLINK;
2194                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2195                         server->caps |= NFS_CAP_OWNER;
2196                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2197                         server->caps |= NFS_CAP_OWNER_GROUP;
2198                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2199                         server->caps |= NFS_CAP_ATIME;
2200                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2201                         server->caps |= NFS_CAP_CTIME;
2202                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2203                         server->caps |= NFS_CAP_MTIME;
2204
2205                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2206                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2207                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2208                 server->acl_bitmask = res.acl_bitmask;
2209         }
2210
2211         return status;
2212 }
2213
2214 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2215 {
2216         struct nfs4_exception exception = { };
2217         int err;
2218         do {
2219                 err = nfs4_handle_exception(server,
2220                                 _nfs4_server_capabilities(server, fhandle),
2221                                 &exception);
2222         } while (exception.retry);
2223         return err;
2224 }
2225
2226 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2227                 struct nfs_fsinfo *info)
2228 {
2229         struct nfs4_lookup_root_arg args = {
2230                 .bitmask = nfs4_fattr_bitmap,
2231         };
2232         struct nfs4_lookup_res res = {
2233                 .server = server,
2234                 .fattr = info->fattr,
2235                 .fh = fhandle,
2236         };
2237         struct rpc_message msg = {
2238                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2239                 .rpc_argp = &args,
2240                 .rpc_resp = &res,
2241         };
2242
2243         nfs_fattr_init(info->fattr);
2244         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2245 }
2246
2247 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2248                 struct nfs_fsinfo *info)
2249 {
2250         struct nfs4_exception exception = { };
2251         int err;
2252         do {
2253                 err = _nfs4_lookup_root(server, fhandle, info);
2254                 switch (err) {
2255                 case 0:
2256                 case -NFS4ERR_WRONGSEC:
2257                         goto out;
2258                 default:
2259                         err = nfs4_handle_exception(server, err, &exception);
2260                 }
2261         } while (exception.retry);
2262 out:
2263         return err;
2264 }
2265
2266 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2267                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2268 {
2269         struct rpc_auth *auth;
2270         int ret;
2271
2272         auth = rpcauth_create(flavor, server->client);
2273         if (!auth) {
2274                 ret = -EIO;
2275                 goto out;
2276         }
2277         ret = nfs4_lookup_root(server, fhandle, info);
2278 out:
2279         return ret;
2280 }
2281
2282 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2283                               struct nfs_fsinfo *info)
2284 {
2285         int i, len, status = 0;
2286         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2287
2288         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2289         flav_array[len] = RPC_AUTH_NULL;
2290         len += 1;
2291
2292         for (i = 0; i < len; i++) {
2293                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2294                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2295                         continue;
2296                 break;
2297         }
2298         /*
2299          * -EACCESS could mean that the user doesn't have correct permissions
2300          * to access the mount.  It could also mean that we tried to mount
2301          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2302          * existing mount programs don't handle -EACCES very well so it should
2303          * be mapped to -EPERM instead.
2304          */
2305         if (status == -EACCES)
2306                 status = -EPERM;
2307         return status;
2308 }
2309
2310 /*
2311  * get the file handle for the "/" directory on the server
2312  */
2313 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2314                               struct nfs_fsinfo *info)
2315 {
2316         int minor_version = server->nfs_client->cl_minorversion;
2317         int status = nfs4_lookup_root(server, fhandle, info);
2318         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2319                 /*
2320                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2321                  * by nfs4_map_errors() as this function exits.
2322                  */
2323                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2324         if (status == 0)
2325                 status = nfs4_server_capabilities(server, fhandle);
2326         if (status == 0)
2327                 status = nfs4_do_fsinfo(server, fhandle, info);
2328         return nfs4_map_errors(status);
2329 }
2330
2331 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2332 /*
2333  * Get locations and (maybe) other attributes of a referral.
2334  * Note that we'll actually follow the referral later when
2335  * we detect fsid mismatch in inode revalidation
2336  */
2337 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2338                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2339 {
2340         int status = -ENOMEM;
2341         struct page *page = NULL;
2342         struct nfs4_fs_locations *locations = NULL;
2343
2344         page = alloc_page(GFP_KERNEL);
2345         if (page == NULL)
2346                 goto out;
2347         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2348         if (locations == NULL)
2349                 goto out;
2350
2351         status = nfs4_proc_fs_locations(dir, name, locations, page);
2352         if (status != 0)
2353                 goto out;
2354         /* Make sure server returned a different fsid for the referral */
2355         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2356                 dprintk("%s: server did not return a different fsid for"
2357                         " a referral at %s\n", __func__, name->name);
2358                 status = -EIO;
2359                 goto out;
2360         }
2361         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2362         nfs_fixup_referral_attributes(&locations->fattr);
2363
2364         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2365         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2366         memset(fhandle, 0, sizeof(struct nfs_fh));
2367 out:
2368         if (page)
2369                 __free_page(page);
2370         kfree(locations);
2371         return status;
2372 }
2373
2374 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2375 {
2376         struct nfs4_getattr_arg args = {
2377                 .fh = fhandle,
2378                 .bitmask = server->attr_bitmask,
2379         };
2380         struct nfs4_getattr_res res = {
2381                 .fattr = fattr,
2382                 .server = server,
2383         };
2384         struct rpc_message msg = {
2385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2386                 .rpc_argp = &args,
2387                 .rpc_resp = &res,
2388         };
2389
2390         nfs_fattr_init(fattr);
2391         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2392 }
2393
2394 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2395 {
2396         struct nfs4_exception exception = { };
2397         int err;
2398         do {
2399                 err = nfs4_handle_exception(server,
2400                                 _nfs4_proc_getattr(server, fhandle, fattr),
2401                                 &exception);
2402         } while (exception.retry);
2403         return err;
2404 }
2405
2406 /*
2407  * The file is not closed if it is opened due to the a request to change
2408  * the size of the file. The open call will not be needed once the
2409  * VFS layer lookup-intents are implemented.
2410  *
2411  * Close is called when the inode is destroyed.
2412  * If we haven't opened the file for O_WRONLY, we
2413  * need to in the size_change case to obtain a stateid.
2414  *
2415  * Got race?
2416  * Because OPEN is always done by name in nfsv4, it is
2417  * possible that we opened a different file by the same
2418  * name.  We can recognize this race condition, but we
2419  * can't do anything about it besides returning an error.
2420  *
2421  * This will be fixed with VFS changes (lookup-intent).
2422  */
2423 static int
2424 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2425                   struct iattr *sattr)
2426 {
2427         struct inode *inode = dentry->d_inode;
2428         struct rpc_cred *cred = NULL;
2429         struct nfs4_state *state = NULL;
2430         int status;
2431
2432         if (pnfs_ld_layoutret_on_setattr(inode))
2433                 pnfs_return_layout(inode);
2434
2435         nfs_fattr_init(fattr);
2436
2437         /* Search for an existing open(O_WRITE) file */
2438         if (sattr->ia_valid & ATTR_FILE) {
2439                 struct nfs_open_context *ctx;
2440
2441                 ctx = nfs_file_open_context(sattr->ia_file);
2442                 if (ctx) {
2443                         cred = ctx->cred;
2444                         state = ctx->state;
2445                 }
2446         }
2447
2448         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2449         if (status == 0)
2450                 nfs_setattr_update_inode(inode, sattr);
2451         return status;
2452 }
2453
2454 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2455                 const struct qstr *name, struct nfs_fh *fhandle,
2456                 struct nfs_fattr *fattr)
2457 {
2458         struct nfs_server *server = NFS_SERVER(dir);
2459         int                    status;
2460         struct nfs4_lookup_arg args = {
2461                 .bitmask = server->attr_bitmask,
2462                 .dir_fh = NFS_FH(dir),
2463                 .name = name,
2464         };
2465         struct nfs4_lookup_res res = {
2466                 .server = server,
2467                 .fattr = fattr,
2468                 .fh = fhandle,
2469         };
2470         struct rpc_message msg = {
2471                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2472                 .rpc_argp = &args,
2473                 .rpc_resp = &res,
2474         };
2475
2476         nfs_fattr_init(fattr);
2477
2478         dprintk("NFS call  lookup %s\n", name->name);
2479         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2480         dprintk("NFS reply lookup: %d\n", status);
2481         return status;
2482 }
2483
2484 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2485 {
2486         memset(fh, 0, sizeof(struct nfs_fh));
2487         fattr->fsid.major = 1;
2488         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2489                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2490         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2491         fattr->nlink = 2;
2492 }
2493
2494 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2495                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2496 {
2497         struct nfs4_exception exception = { };
2498         int err;
2499         do {
2500                 int status;
2501
2502                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2503                 switch (status) {
2504                 case -NFS4ERR_BADNAME:
2505                         return -ENOENT;
2506                 case -NFS4ERR_MOVED:
2507                         return nfs4_get_referral(dir, name, fattr, fhandle);
2508                 case -NFS4ERR_WRONGSEC:
2509                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2510                 }
2511                 err = nfs4_handle_exception(NFS_SERVER(dir),
2512                                 status, &exception);
2513         } while (exception.retry);
2514         return err;
2515 }
2516
2517 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2518 {
2519         struct nfs_server *server = NFS_SERVER(inode);
2520         struct nfs4_accessargs args = {
2521                 .fh = NFS_FH(inode),
2522                 .bitmask = server->attr_bitmask,
2523         };
2524         struct nfs4_accessres res = {
2525                 .server = server,
2526         };
2527         struct rpc_message msg = {
2528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2529                 .rpc_argp = &args,
2530                 .rpc_resp = &res,
2531                 .rpc_cred = entry->cred,
2532         };
2533         int mode = entry->mask;
2534         int status;
2535
2536         /*
2537          * Determine which access bits we want to ask for...
2538          */
2539         if (mode & MAY_READ)
2540                 args.access |= NFS4_ACCESS_READ;
2541         if (S_ISDIR(inode->i_mode)) {
2542                 if (mode & MAY_WRITE)
2543                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2544                 if (mode & MAY_EXEC)
2545                         args.access |= NFS4_ACCESS_LOOKUP;
2546         } else {
2547                 if (mode & MAY_WRITE)
2548                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2549                 if (mode & MAY_EXEC)
2550                         args.access |= NFS4_ACCESS_EXECUTE;
2551         }
2552
2553         res.fattr = nfs_alloc_fattr();
2554         if (res.fattr == NULL)
2555                 return -ENOMEM;
2556
2557         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2558         if (!status) {
2559                 entry->mask = 0;
2560                 if (res.access & NFS4_ACCESS_READ)
2561                         entry->mask |= MAY_READ;
2562                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2563                         entry->mask |= MAY_WRITE;
2564                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2565                         entry->mask |= MAY_EXEC;
2566                 nfs_refresh_inode(inode, res.fattr);
2567         }
2568         nfs_free_fattr(res.fattr);
2569         return status;
2570 }
2571
2572 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2573 {
2574         struct nfs4_exception exception = { };
2575         int err;
2576         do {
2577                 err = nfs4_handle_exception(NFS_SERVER(inode),
2578                                 _nfs4_proc_access(inode, entry),
2579                                 &exception);
2580         } while (exception.retry);
2581         return err;
2582 }
2583
2584 /*
2585  * TODO: For the time being, we don't try to get any attributes
2586  * along with any of the zero-copy operations READ, READDIR,
2587  * READLINK, WRITE.
2588  *
2589  * In the case of the first three, we want to put the GETATTR
2590  * after the read-type operation -- this is because it is hard
2591  * to predict the length of a GETATTR response in v4, and thus
2592  * align the READ data correctly.  This means that the GETATTR
2593  * may end up partially falling into the page cache, and we should
2594  * shift it into the 'tail' of the xdr_buf before processing.
2595  * To do this efficiently, we need to know the total length
2596  * of data received, which doesn't seem to be available outside
2597  * of the RPC layer.
2598  *
2599  * In the case of WRITE, we also want to put the GETATTR after
2600  * the operation -- in this case because we want to make sure
2601  * we get the post-operation mtime and size.  This means that
2602  * we can't use xdr_encode_pages() as written: we need a variant
2603  * of it which would leave room in the 'tail' iovec.
2604  *
2605  * Both of these changes to the XDR layer would in fact be quite
2606  * minor, but I decided to leave them for a subsequent patch.
2607  */
2608 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2609                 unsigned int pgbase, unsigned int pglen)
2610 {
2611         struct nfs4_readlink args = {
2612                 .fh       = NFS_FH(inode),
2613                 .pgbase   = pgbase,
2614                 .pglen    = pglen,
2615                 .pages    = &page,
2616         };
2617         struct nfs4_readlink_res res;
2618         struct rpc_message msg = {
2619                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2620                 .rpc_argp = &args,
2621                 .rpc_resp = &res,
2622         };
2623
2624         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2625 }
2626
2627 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2628                 unsigned int pgbase, unsigned int pglen)
2629 {
2630         struct nfs4_exception exception = { };
2631         int err;
2632         do {
2633                 err = nfs4_handle_exception(NFS_SERVER(inode),
2634                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2635                                 &exception);
2636         } while (exception.retry);
2637         return err;
2638 }
2639
2640 /*
2641  * Got race?
2642  * We will need to arrange for the VFS layer to provide an atomic open.
2643  * Until then, this create/open method is prone to inefficiency and race
2644  * conditions due to the lookup, create, and open VFS calls from sys_open()
2645  * placed on the wire.
2646  *
2647  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2648  * The file will be opened again in the subsequent VFS open call
2649  * (nfs4_proc_file_open).
2650  *
2651  * The open for read will just hang around to be used by any process that
2652  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2653  */
2654
2655 static int
2656 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2657                  int flags, struct nfs_open_context *ctx)
2658 {
2659         struct dentry *de = dentry;
2660         struct nfs4_state *state;
2661         struct rpc_cred *cred = NULL;
2662         fmode_t fmode = 0;
2663         int status = 0;
2664
2665         if (ctx != NULL) {
2666                 cred = ctx->cred;
2667                 de = ctx->dentry;
2668                 fmode = ctx->mode;
2669         }
2670         sattr->ia_mode &= ~current_umask();
2671         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2672         d_drop(dentry);
2673         if (IS_ERR(state)) {
2674                 status = PTR_ERR(state);
2675                 goto out;
2676         }
2677         d_add(dentry, igrab(state->inode));
2678         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2679         if (ctx != NULL)
2680                 ctx->state = state;
2681         else
2682                 nfs4_close_sync(state, fmode);
2683 out:
2684         return status;
2685 }
2686
2687 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2688 {
2689         struct nfs_server *server = NFS_SERVER(dir);
2690         struct nfs_removeargs args = {
2691                 .fh = NFS_FH(dir),
2692                 .name.len = name->len,
2693                 .name.name = name->name,
2694                 .bitmask = server->attr_bitmask,
2695         };
2696         struct nfs_removeres res = {
2697                 .server = server,
2698         };
2699         struct rpc_message msg = {
2700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2701                 .rpc_argp = &args,
2702                 .rpc_resp = &res,
2703         };
2704         int status = -ENOMEM;
2705
2706         res.dir_attr = nfs_alloc_fattr();
2707         if (res.dir_attr == NULL)
2708                 goto out;
2709
2710         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2711         if (status == 0) {
2712                 update_changeattr(dir, &res.cinfo);
2713                 nfs_post_op_update_inode(dir, res.dir_attr);
2714         }
2715         nfs_free_fattr(res.dir_attr);
2716 out:
2717         return status;
2718 }
2719
2720 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2721 {
2722         struct nfs4_exception exception = { };
2723         int err;
2724         do {
2725                 err = nfs4_handle_exception(NFS_SERVER(dir),
2726                                 _nfs4_proc_remove(dir, name),
2727                                 &exception);
2728         } while (exception.retry);
2729         return err;
2730 }
2731
2732 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2733 {
2734         struct nfs_server *server = NFS_SERVER(dir);
2735         struct nfs_removeargs *args = msg->rpc_argp;
2736         struct nfs_removeres *res = msg->rpc_resp;
2737
2738         args->bitmask = server->cache_consistency_bitmask;
2739         res->server = server;
2740         res->seq_res.sr_slot = NULL;
2741         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2742 }
2743
2744 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2745 {
2746         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2747
2748         if (!nfs4_sequence_done(task, &res->seq_res))
2749                 return 0;
2750         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2751                 return 0;
2752         update_changeattr(dir, &res->cinfo);
2753         nfs_post_op_update_inode(dir, res->dir_attr);
2754         return 1;
2755 }
2756
2757 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2758 {
2759         struct nfs_server *server = NFS_SERVER(dir);
2760         struct nfs_renameargs *arg = msg->rpc_argp;
2761         struct nfs_renameres *res = msg->rpc_resp;
2762
2763         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2764         arg->bitmask = server->attr_bitmask;
2765         res->server = server;
2766 }
2767
2768 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2769                                  struct inode *new_dir)
2770 {
2771         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2772
2773         if (!nfs4_sequence_done(task, &res->seq_res))
2774                 return 0;
2775         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2776                 return 0;
2777
2778         update_changeattr(old_dir, &res->old_cinfo);
2779         nfs_post_op_update_inode(old_dir, res->old_fattr);
2780         update_changeattr(new_dir, &res->new_cinfo);
2781         nfs_post_op_update_inode(new_dir, res->new_fattr);
2782         return 1;
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 nfs_server *server = NFS_SERVER(old_dir);
2789         struct nfs_renameargs arg = {
2790                 .old_dir = NFS_FH(old_dir),
2791                 .new_dir = NFS_FH(new_dir),
2792                 .old_name = old_name,
2793                 .new_name = new_name,
2794                 .bitmask = server->attr_bitmask,
2795         };
2796         struct nfs_renameres res = {
2797                 .server = server,
2798         };
2799         struct rpc_message msg = {
2800                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2801                 .rpc_argp = &arg,
2802                 .rpc_resp = &res,
2803         };
2804         int status = -ENOMEM;
2805
2806         res.old_fattr = nfs_alloc_fattr();
2807         res.new_fattr = nfs_alloc_fattr();
2808         if (res.old_fattr == NULL || res.new_fattr == NULL)
2809                 goto out;
2810
2811         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2812         if (!status) {
2813                 update_changeattr(old_dir, &res.old_cinfo);
2814                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2815                 update_changeattr(new_dir, &res.new_cinfo);
2816                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2817         }
2818 out:
2819         nfs_free_fattr(res.new_fattr);
2820         nfs_free_fattr(res.old_fattr);
2821         return status;
2822 }
2823
2824 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2825                 struct inode *new_dir, struct qstr *new_name)
2826 {
2827         struct nfs4_exception exception = { };
2828         int err;
2829         do {
2830                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2831                                 _nfs4_proc_rename(old_dir, old_name,
2832                                         new_dir, new_name),
2833                                 &exception);
2834         } while (exception.retry);
2835         return err;
2836 }
2837
2838 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2839 {
2840         struct nfs_server *server = NFS_SERVER(inode);
2841         struct nfs4_link_arg arg = {
2842                 .fh     = NFS_FH(inode),
2843                 .dir_fh = NFS_FH(dir),
2844                 .name   = name,
2845                 .bitmask = server->attr_bitmask,
2846         };
2847         struct nfs4_link_res res = {
2848                 .server = server,
2849         };
2850         struct rpc_message msg = {
2851                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2852                 .rpc_argp = &arg,
2853                 .rpc_resp = &res,
2854         };
2855         int status = -ENOMEM;
2856
2857         res.fattr = nfs_alloc_fattr();
2858         res.dir_attr = nfs_alloc_fattr();
2859         if (res.fattr == NULL || res.dir_attr == NULL)
2860                 goto out;
2861
2862         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2863         if (!status) {
2864                 update_changeattr(dir, &res.cinfo);
2865                 nfs_post_op_update_inode(dir, res.dir_attr);
2866                 nfs_post_op_update_inode(inode, res.fattr);
2867         }
2868 out:
2869         nfs_free_fattr(res.dir_attr);
2870         nfs_free_fattr(res.fattr);
2871         return status;
2872 }
2873
2874 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2875 {
2876         struct nfs4_exception exception = { };
2877         int err;
2878         do {
2879                 err = nfs4_handle_exception(NFS_SERVER(inode),
2880                                 _nfs4_proc_link(inode, dir, name),
2881                                 &exception);
2882         } while (exception.retry);
2883         return err;
2884 }
2885
2886 struct nfs4_createdata {
2887         struct rpc_message msg;
2888         struct nfs4_create_arg arg;
2889         struct nfs4_create_res res;
2890         struct nfs_fh fh;
2891         struct nfs_fattr fattr;
2892         struct nfs_fattr dir_fattr;
2893 };
2894
2895 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2896                 struct qstr *name, struct iattr *sattr, u32 ftype)
2897 {
2898         struct nfs4_createdata *data;
2899
2900         data = kzalloc(sizeof(*data), GFP_KERNEL);
2901         if (data != NULL) {
2902                 struct nfs_server *server = NFS_SERVER(dir);
2903
2904                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2905                 data->msg.rpc_argp = &data->arg;
2906                 data->msg.rpc_resp = &data->res;
2907                 data->arg.dir_fh = NFS_FH(dir);
2908                 data->arg.server = server;
2909                 data->arg.name = name;
2910                 data->arg.attrs = sattr;
2911                 data->arg.ftype = ftype;
2912                 data->arg.bitmask = server->attr_bitmask;
2913                 data->res.server = server;
2914                 data->res.fh = &data->fh;
2915                 data->res.fattr = &data->fattr;
2916                 data->res.dir_fattr = &data->dir_fattr;
2917                 nfs_fattr_init(data->res.fattr);
2918                 nfs_fattr_init(data->res.dir_fattr);
2919         }
2920         return data;
2921 }
2922
2923 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2924 {
2925         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2926                                     &data->arg.seq_args, &data->res.seq_res, 1);
2927         if (status == 0) {
2928                 update_changeattr(dir, &data->res.dir_cinfo);
2929                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2930                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2931         }
2932         return status;
2933 }
2934
2935 static void nfs4_free_createdata(struct nfs4_createdata *data)
2936 {
2937         kfree(data);
2938 }
2939
2940 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2941                 struct page *page, unsigned int len, struct iattr *sattr)
2942 {
2943         struct nfs4_createdata *data;
2944         int status = -ENAMETOOLONG;
2945
2946         if (len > NFS4_MAXPATHLEN)
2947                 goto out;
2948
2949         status = -ENOMEM;
2950         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2951         if (data == NULL)
2952                 goto out;
2953
2954         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2955         data->arg.u.symlink.pages = &page;
2956         data->arg.u.symlink.len = len;
2957
2958         status = nfs4_do_create(dir, dentry, data);
2959
2960         nfs4_free_createdata(data);
2961 out:
2962         return status;
2963 }
2964
2965 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2966                 struct page *page, unsigned int len, struct iattr *sattr)
2967 {
2968         struct nfs4_exception exception = { };
2969         int err;
2970         do {
2971                 err = nfs4_handle_exception(NFS_SERVER(dir),
2972                                 _nfs4_proc_symlink(dir, dentry, page,
2973                                                         len, sattr),
2974                                 &exception);
2975         } while (exception.retry);
2976         return err;
2977 }
2978
2979 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2980                 struct iattr *sattr)
2981 {
2982         struct nfs4_createdata *data;
2983         int status = -ENOMEM;
2984
2985         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2986         if (data == NULL)
2987                 goto out;
2988
2989         status = nfs4_do_create(dir, dentry, data);
2990
2991         nfs4_free_createdata(data);
2992 out:
2993         return status;
2994 }
2995
2996 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2997                 struct iattr *sattr)
2998 {
2999         struct nfs4_exception exception = { };
3000         int err;
3001
3002         sattr->ia_mode &= ~current_umask();
3003         do {
3004                 err = nfs4_handle_exception(NFS_SERVER(dir),
3005                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3006                                 &exception);
3007         } while (exception.retry);
3008         return err;
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 inode            *dir = dentry->d_inode;
3015         struct nfs4_readdir_arg args = {
3016                 .fh = NFS_FH(dir),
3017                 .pages = pages,
3018                 .pgbase = 0,
3019                 .count = count,
3020                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3021                 .plus = plus,
3022         };
3023         struct nfs4_readdir_res res;
3024         struct rpc_message msg = {
3025                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3026                 .rpc_argp = &args,
3027                 .rpc_resp = &res,
3028                 .rpc_cred = cred,
3029         };
3030         int                     status;
3031
3032         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3033                         dentry->d_parent->d_name.name,
3034                         dentry->d_name.name,
3035                         (unsigned long long)cookie);
3036         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3037         res.pgbase = args.pgbase;
3038         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3039         if (status >= 0) {
3040                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3041                 status += args.pgbase;
3042         }
3043
3044         nfs_invalidate_atime(dir);
3045
3046         dprintk("%s: returns %d\n", __func__, status);
3047         return status;
3048 }
3049
3050 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3051                 u64 cookie, struct page **pages, unsigned int count, int plus)
3052 {
3053         struct nfs4_exception exception = { };
3054         int err;
3055         do {
3056                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3057                                 _nfs4_proc_readdir(dentry, cred, cookie,
3058                                         pages, count, plus),
3059                                 &exception);
3060         } while (exception.retry);
3061         return err;
3062 }
3063
3064 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3065                 struct iattr *sattr, dev_t rdev)
3066 {
3067         struct nfs4_createdata *data;
3068         int mode = sattr->ia_mode;
3069         int status = -ENOMEM;
3070
3071         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3072         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3073
3074         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3075         if (data == NULL)
3076                 goto out;
3077
3078         if (S_ISFIFO(mode))
3079                 data->arg.ftype = NF4FIFO;
3080         else if (S_ISBLK(mode)) {
3081                 data->arg.ftype = NF4BLK;
3082                 data->arg.u.device.specdata1 = MAJOR(rdev);
3083                 data->arg.u.device.specdata2 = MINOR(rdev);
3084         }
3085         else if (S_ISCHR(mode)) {
3086                 data->arg.ftype = NF4CHR;
3087                 data->arg.u.device.specdata1 = MAJOR(rdev);
3088                 data->arg.u.device.specdata2 = MINOR(rdev);
3089         }
3090
3091         status = nfs4_do_create(dir, dentry, data);
3092
3093         nfs4_free_createdata(data);
3094 out:
3095         return status;
3096 }
3097
3098 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3099                 struct iattr *sattr, dev_t rdev)
3100 {
3101         struct nfs4_exception exception = { };
3102         int err;
3103
3104         sattr->ia_mode &= ~current_umask();
3105         do {
3106                 err = nfs4_handle_exception(NFS_SERVER(dir),
3107                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3108                                 &exception);
3109         } while (exception.retry);
3110         return err;
3111 }
3112
3113 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3114                  struct nfs_fsstat *fsstat)
3115 {
3116         struct nfs4_statfs_arg args = {
3117                 .fh = fhandle,
3118                 .bitmask = server->attr_bitmask,
3119         };
3120         struct nfs4_statfs_res res = {
3121                 .fsstat = fsstat,
3122         };
3123         struct rpc_message msg = {
3124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3125                 .rpc_argp = &args,
3126                 .rpc_resp = &res,
3127         };
3128
3129         nfs_fattr_init(fsstat->fattr);
3130         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3131 }
3132
3133 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3134 {
3135         struct nfs4_exception exception = { };
3136         int err;
3137         do {
3138                 err = nfs4_handle_exception(server,
3139                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3140                                 &exception);
3141         } while (exception.retry);
3142         return err;
3143 }
3144
3145 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3146                 struct nfs_fsinfo *fsinfo)
3147 {
3148         struct nfs4_fsinfo_arg args = {
3149                 .fh = fhandle,
3150                 .bitmask = server->attr_bitmask,
3151         };
3152         struct nfs4_fsinfo_res res = {
3153                 .fsinfo = fsinfo,
3154         };
3155         struct rpc_message msg = {
3156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3157                 .rpc_argp = &args,
3158                 .rpc_resp = &res,
3159         };
3160
3161         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3162 }
3163
3164 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3165 {
3166         struct nfs4_exception exception = { };
3167         int err;
3168
3169         do {
3170                 err = nfs4_handle_exception(server,
3171                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3172                                 &exception);
3173         } while (exception.retry);
3174         return err;
3175 }
3176
3177 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3178 {
3179         nfs_fattr_init(fsinfo->fattr);
3180         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3181 }
3182
3183 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3184                 struct nfs_pathconf *pathconf)
3185 {
3186         struct nfs4_pathconf_arg args = {
3187                 .fh = fhandle,
3188                 .bitmask = server->attr_bitmask,
3189         };
3190         struct nfs4_pathconf_res res = {
3191                 .pathconf = pathconf,
3192         };
3193         struct rpc_message msg = {
3194                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3195                 .rpc_argp = &args,
3196                 .rpc_resp = &res,
3197         };
3198
3199         /* None of the pathconf attributes are mandatory to implement */
3200         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3201                 memset(pathconf, 0, sizeof(*pathconf));
3202                 return 0;
3203         }
3204
3205         nfs_fattr_init(pathconf->fattr);
3206         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3207 }
3208
3209 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3210                 struct nfs_pathconf *pathconf)
3211 {
3212         struct nfs4_exception exception = { };
3213         int err;
3214
3215         do {
3216                 err = nfs4_handle_exception(server,
3217                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3218                                 &exception);
3219         } while (exception.retry);
3220         return err;
3221 }
3222
3223 void __nfs4_read_done_cb(struct nfs_read_data *data)
3224 {
3225         nfs_invalidate_atime(data->inode);
3226 }
3227
3228 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3229 {
3230         struct nfs_server *server = NFS_SERVER(data->inode);
3231
3232         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3233                 rpc_restart_call_prepare(task);
3234                 return -EAGAIN;
3235         }
3236
3237         __nfs4_read_done_cb(data);
3238         if (task->tk_status > 0)
3239                 renew_lease(server, data->timestamp);
3240         return 0;
3241 }
3242
3243 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3244 {
3245
3246         dprintk("--> %s\n", __func__);
3247
3248         if (!nfs4_sequence_done(task, &data->res.seq_res))
3249                 return -EAGAIN;
3250
3251         return data->read_done_cb ? data->read_done_cb(task, data) :
3252                                     nfs4_read_done_cb(task, data);
3253 }
3254
3255 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3256 {
3257         data->timestamp   = jiffies;
3258         data->read_done_cb = nfs4_read_done_cb;
3259         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3260 }
3261
3262 /* Reset the the nfs_read_data to send the read to the MDS. */
3263 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3264 {
3265         dprintk("%s Reset task for i/o through\n", __func__);
3266         put_lseg(data->lseg);
3267         data->lseg = NULL;
3268         /* offsets will differ in the dense stripe case */
3269         data->args.offset = data->mds_offset;
3270         data->ds_clp = NULL;
3271         data->args.fh     = NFS_FH(data->inode);
3272         data->read_done_cb = nfs4_read_done_cb;
3273         task->tk_ops = data->mds_ops;
3274         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3275 }
3276 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3277
3278 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3279 {
3280         struct inode *inode = data->inode;
3281
3282         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3283                 rpc_restart_call_prepare(task);
3284                 return -EAGAIN;
3285         }
3286         if (task->tk_status >= 0) {
3287                 renew_lease(NFS_SERVER(inode), data->timestamp);
3288                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3289         }
3290         return 0;
3291 }
3292
3293 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3294 {
3295         if (!nfs4_sequence_done(task, &data->res.seq_res))
3296                 return -EAGAIN;
3297         return data->write_done_cb ? data->write_done_cb(task, data) :
3298                 nfs4_write_done_cb(task, data);
3299 }
3300
3301 /* Reset the the nfs_write_data to send the write to the MDS. */
3302 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3303 {
3304         dprintk("%s Reset task for i/o through\n", __func__);
3305         put_lseg(data->lseg);
3306         data->lseg          = NULL;
3307         data->ds_clp        = NULL;
3308         data->write_done_cb = nfs4_write_done_cb;
3309         data->args.fh       = NFS_FH(data->inode);
3310         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3311         data->args.offset   = data->mds_offset;
3312         data->res.fattr     = &data->fattr;
3313         task->tk_ops        = data->mds_ops;
3314         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3315 }
3316 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3317
3318 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3319 {
3320         struct nfs_server *server = NFS_SERVER(data->inode);
3321
3322         if (data->lseg) {
3323                 data->args.bitmask = NULL;
3324                 data->res.fattr = NULL;
3325         } else
3326                 data->args.bitmask = server->cache_consistency_bitmask;
3327         if (!data->write_done_cb)
3328                 data->write_done_cb = nfs4_write_done_cb;
3329         data->res.server = server;
3330         data->timestamp   = jiffies;
3331
3332         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3333 }
3334
3335 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3336 {
3337         struct inode *inode = data->inode;
3338
3339         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3340                 rpc_restart_call_prepare(task);
3341                 return -EAGAIN;
3342         }
3343         nfs_refresh_inode(inode, data->res.fattr);
3344         return 0;
3345 }
3346
3347 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3348 {
3349         if (!nfs4_sequence_done(task, &data->res.seq_res))
3350                 return -EAGAIN;
3351         return data->write_done_cb(task, data);
3352 }
3353
3354 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3355 {
3356         struct nfs_server *server = NFS_SERVER(data->inode);
3357
3358         if (data->lseg) {
3359                 data->args.bitmask = NULL;
3360                 data->res.fattr = NULL;
3361         } else
3362                 data->args.bitmask = server->cache_consistency_bitmask;
3363         if (!data->write_done_cb)
3364                 data->write_done_cb = nfs4_commit_done_cb;
3365         data->res.server = server;
3366         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3367 }
3368
3369 struct nfs4_renewdata {
3370         struct nfs_client       *client;
3371         unsigned long           timestamp;
3372 };
3373
3374 /*
3375  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3376  * standalone procedure for queueing an asynchronous RENEW.
3377  */
3378 static void nfs4_renew_release(void *calldata)
3379 {
3380         struct nfs4_renewdata *data = calldata;
3381         struct nfs_client *clp = data->client;
3382
3383         if (atomic_read(&clp->cl_count) > 1)
3384                 nfs4_schedule_state_renewal(clp);
3385         nfs_put_client(clp);
3386         kfree(data);
3387 }
3388
3389 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3390 {
3391         struct nfs4_renewdata *data = calldata;
3392         struct nfs_client *clp = data->client;
3393         unsigned long timestamp = data->timestamp;
3394
3395         if (task->tk_status < 0) {
3396                 /* Unless we're shutting down, schedule state recovery! */
3397                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3398                         return;
3399                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3400                         nfs4_schedule_lease_recovery(clp);
3401                         return;
3402                 }
3403                 nfs4_schedule_path_down_recovery(clp);
3404         }
3405         do_renew_lease(clp, timestamp);
3406 }
3407
3408 static const struct rpc_call_ops nfs4_renew_ops = {
3409         .rpc_call_done = nfs4_renew_done,
3410         .rpc_release = nfs4_renew_release,
3411 };
3412
3413 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3414 {
3415         struct rpc_message msg = {
3416                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3417                 .rpc_argp       = clp,
3418                 .rpc_cred       = cred,
3419         };
3420         struct nfs4_renewdata *data;
3421
3422         if (renew_flags == 0)
3423                 return 0;
3424         if (!atomic_inc_not_zero(&clp->cl_count))
3425                 return -EIO;
3426         data = kmalloc(sizeof(*data), GFP_NOFS);
3427         if (data == NULL)
3428                 return -ENOMEM;
3429         data->client = clp;
3430         data->timestamp = jiffies;
3431         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3432                         &nfs4_renew_ops, data);
3433 }
3434
3435 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3436 {
3437         struct rpc_message msg = {
3438                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3439                 .rpc_argp       = clp,
3440                 .rpc_cred       = cred,
3441         };
3442         unsigned long now = jiffies;
3443         int status;
3444
3445         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3446         if (status < 0)
3447                 return status;
3448         do_renew_lease(clp, now);
3449         return 0;
3450 }
3451
3452 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3453 {
3454         return (server->caps & NFS_CAP_ACLS)
3455                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3456                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3457 }
3458
3459 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3460  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3461  * the stack.
3462  */
3463 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3464
3465 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3466                 struct page **pages, unsigned int *pgbase)
3467 {
3468         struct page *newpage, **spages;
3469         int rc = 0;
3470         size_t len;
3471         spages = pages;
3472
3473         do {
3474                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3475                 newpage = alloc_page(GFP_KERNEL);
3476
3477                 if (newpage == NULL)
3478                         goto unwind;
3479                 memcpy(page_address(newpage), buf, len);
3480                 buf += len;
3481                 buflen -= len;
3482                 *pages++ = newpage;
3483                 rc++;
3484         } while (buflen != 0);
3485
3486         return rc;
3487
3488 unwind:
3489         for(; rc > 0; rc--)
3490                 __free_page(spages[rc-1]);
3491         return -ENOMEM;
3492 }
3493
3494 struct nfs4_cached_acl {
3495         int cached;
3496         size_t len;
3497         char data[0];
3498 };
3499
3500 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3501 {
3502         struct nfs_inode *nfsi = NFS_I(inode);
3503
3504         spin_lock(&inode->i_lock);
3505         kfree(nfsi->nfs4_acl);
3506         nfsi->nfs4_acl = acl;
3507         spin_unlock(&inode->i_lock);
3508 }
3509
3510 static void nfs4_zap_acl_attr(struct inode *inode)
3511 {
3512         nfs4_set_cached_acl(inode, NULL);
3513 }
3514
3515 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3516 {
3517         struct nfs_inode *nfsi = NFS_I(inode);
3518         struct nfs4_cached_acl *acl;
3519         int ret = -ENOENT;
3520
3521         spin_lock(&inode->i_lock);
3522         acl = nfsi->nfs4_acl;
3523         if (acl == NULL)
3524                 goto out;
3525         if (buf == NULL) /* user is just asking for length */
3526                 goto out_len;
3527         if (acl->cached == 0)
3528                 goto out;
3529         ret = -ERANGE; /* see getxattr(2) man page */
3530         if (acl->len > buflen)
3531                 goto out;
3532         memcpy(buf, acl->data, acl->len);
3533 out_len:
3534         ret = acl->len;
3535 out:
3536         spin_unlock(&inode->i_lock);
3537         return ret;
3538 }
3539
3540 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3541 {
3542         struct nfs4_cached_acl *acl;
3543
3544         if (pages && acl_len <= PAGE_SIZE) {
3545                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3546                 if (acl == NULL)
3547                         goto out;
3548                 acl->cached = 1;
3549                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3550         } else {
3551                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3552                 if (acl == NULL)
3553                         goto out;
3554                 acl->cached = 0;
3555         }
3556         acl->len = acl_len;
3557 out:
3558         nfs4_set_cached_acl(inode, acl);
3559 }
3560
3561 /*
3562  * The getxattr API returns the required buffer length when called with a
3563  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3564  * the required buf.  On a NULL buf, we send a page of data to the server
3565  * guessing that the ACL request can be serviced by a page. If so, we cache
3566  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3567  * the cache. If not so, we throw away the page, and cache the required
3568  * length. The next getxattr call will then produce another round trip to
3569  * the server, this time with the input buf of the required size.
3570  */
3571 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3572 {
3573         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3574         struct nfs_getaclargs args = {
3575                 .fh = NFS_FH(inode),
3576                 .acl_pages = pages,
3577                 .acl_len = buflen,
3578         };
3579         struct nfs_getaclres res = {
3580                 .acl_len = buflen,
3581         };
3582         struct rpc_message msg = {
3583                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3584                 .rpc_argp = &args,
3585                 .rpc_resp = &res,
3586         };
3587         int ret = -ENOMEM, npages, i;
3588         size_t acl_len = 0;
3589
3590         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3591         /* As long as we're doing a round trip to the server anyway,
3592          * let's be prepared for a page of acl data. */
3593         if (npages == 0)
3594                 npages = 1;
3595
3596         /* Add an extra page to handle the bitmap returned */
3597         npages++;
3598
3599         for (i = 0; i < npages; i++) {
3600                 pages[i] = alloc_page(GFP_KERNEL);
3601                 if (!pages[i])
3602                         goto out_free;
3603         }
3604
3605         /* for decoding across pages */
3606         res.acl_scratch = alloc_page(GFP_KERNEL);
3607         if (!res.acl_scratch)
3608                 goto out_free;
3609
3610         args.acl_len = npages * PAGE_SIZE;
3611         args.acl_pgbase = 0;
3612
3613         /* Let decode_getfacl know not to fail if the ACL data is larger than
3614          * the page we send as a guess */
3615         if (buf == NULL)
3616                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3617
3618         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3619                 __func__, buf, buflen, npages, args.acl_len);
3620         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3621                              &msg, &args.seq_args, &res.seq_res, 0);
3622         if (ret)
3623                 goto out_free;
3624
3625         acl_len = res.acl_len - res.acl_data_offset;
3626         if (acl_len > args.acl_len)
3627                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3628         else
3629                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3630                                       acl_len);
3631         if (buf) {
3632                 ret = -ERANGE;
3633                 if (acl_len > buflen)
3634                         goto out_free;
3635                 _copy_from_pages(buf, pages, res.acl_data_offset,
3636                                 acl_len);
3637         }
3638         ret = acl_len;
3639 out_free:
3640         for (i = 0; i < npages; i++)
3641                 if (pages[i])
3642                         __free_page(pages[i]);
3643         if (res.acl_scratch)
3644                 __free_page(res.acl_scratch);
3645         return ret;
3646 }
3647
3648 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3649 {
3650         struct nfs4_exception exception = { };
3651         ssize_t ret;
3652         do {
3653                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3654                 if (ret >= 0)
3655                         break;
3656                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3657         } while (exception.retry);
3658         return ret;
3659 }
3660
3661 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3662 {
3663         struct nfs_server *server = NFS_SERVER(inode);
3664         int ret;
3665
3666         if (!nfs4_server_supports_acls(server))
3667                 return -EOPNOTSUPP;
3668         ret = nfs_revalidate_inode(server, inode);
3669         if (ret < 0)
3670                 return ret;
3671         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3672                 nfs_zap_acl_cache(inode);
3673         ret = nfs4_read_cached_acl(inode, buf, buflen);
3674         if (ret != -ENOENT)
3675                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3676                  * but no cached acl data, just the acl length */
3677                 return ret;
3678         return nfs4_get_acl_uncached(inode, buf, buflen);
3679 }
3680
3681 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3682 {
3683         struct nfs_server *server = NFS_SERVER(inode);
3684         struct page *pages[NFS4ACL_MAXPAGES];
3685         struct nfs_setaclargs arg = {
3686                 .fh             = NFS_FH(inode),
3687                 .acl_pages      = pages,
3688                 .acl_len        = buflen,
3689         };
3690         struct nfs_setaclres res;
3691         struct rpc_message msg = {
3692                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3693                 .rpc_argp       = &arg,
3694                 .rpc_resp       = &res,
3695         };
3696         int ret, i;
3697
3698         if (!nfs4_server_supports_acls(server))
3699                 return -EOPNOTSUPP;
3700         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3701         if (i < 0)
3702                 return i;
3703         nfs_inode_return_delegation(inode);
3704         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3705
3706         /*
3707          * Free each page after tx, so the only ref left is
3708          * held by the network stack
3709          */
3710         for (; i > 0; i--)
3711                 put_page(pages[i-1]);
3712
3713         /*
3714          * Acl update can result in inode attribute update.
3715          * so mark the attribute cache invalid.
3716          */
3717         spin_lock(&inode->i_lock);
3718         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3719         spin_unlock(&inode->i_lock);
3720         nfs_access_zap_cache(inode);
3721         nfs_zap_acl_cache(inode);
3722         return ret;
3723 }
3724
3725 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3726 {
3727         struct nfs4_exception exception = { };
3728         int err;
3729         do {
3730                 err = nfs4_handle_exception(NFS_SERVER(inode),
3731                                 __nfs4_proc_set_acl(inode, buf, buflen),
3732                                 &exception);
3733         } while (exception.retry);
3734         return err;
3735 }
3736
3737 static int
3738 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3739 {
3740         struct nfs_client *clp = server->nfs_client;
3741
3742         if (task->tk_status >= 0)
3743                 return 0;
3744         switch(task->tk_status) {
3745                 case -NFS4ERR_DELEG_REVOKED:
3746                 case -NFS4ERR_ADMIN_REVOKED:
3747                 case -NFS4ERR_BAD_STATEID:
3748                         if (state == NULL)
3749                                 break;
3750                         nfs_remove_bad_delegation(state->inode);
3751                 case -NFS4ERR_OPENMODE:
3752                         if (state == NULL)
3753                                 break;
3754                         nfs4_schedule_stateid_recovery(server, state);
3755                         goto wait_on_recovery;
3756                 case -NFS4ERR_EXPIRED:
3757                         if (state != NULL)
3758                                 nfs4_schedule_stateid_recovery(server, state);
3759                 case -NFS4ERR_STALE_STATEID:
3760                 case -NFS4ERR_STALE_CLIENTID:
3761                         nfs4_schedule_lease_recovery(clp);
3762                         goto wait_on_recovery;
3763 #if defined(CONFIG_NFS_V4_1)
3764                 case -NFS4ERR_BADSESSION:
3765                 case -NFS4ERR_BADSLOT:
3766                 case -NFS4ERR_BAD_HIGH_SLOT:
3767                 case -NFS4ERR_DEADSESSION:
3768                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3769                 case -NFS4ERR_SEQ_FALSE_RETRY:
3770                 case -NFS4ERR_SEQ_MISORDERED:
3771                         dprintk("%s ERROR %d, Reset session\n", __func__,
3772                                 task->tk_status);
3773                         nfs4_schedule_session_recovery(clp->cl_session);
3774                         goto wait_on_recovery;
3775 #endif /* CONFIG_NFS_V4_1 */
3776                 case -NFS4ERR_DELAY:
3777                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3778                 case -NFS4ERR_GRACE:
3779                 case -EKEYEXPIRED:
3780                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3781                         task->tk_status = 0;
3782                         return -EAGAIN;
3783                 case -NFS4ERR_RETRY_UNCACHED_REP:
3784                 case -NFS4ERR_OLD_STATEID:
3785                         task->tk_status = 0;
3786                         return -EAGAIN;
3787         }
3788         task->tk_status = nfs4_map_errors(task->tk_status);
3789         return 0;
3790 wait_on_recovery:
3791         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3792         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3793                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3794         task->tk_status = 0;
3795         return -EAGAIN;
3796 }
3797
3798 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3799                 unsigned short port, struct rpc_cred *cred,
3800                 struct nfs4_setclientid_res *res)
3801 {
3802         nfs4_verifier sc_verifier;
3803         struct nfs4_setclientid setclientid = {
3804                 .sc_verifier = &sc_verifier,
3805                 .sc_prog = program,
3806                 .sc_cb_ident = clp->cl_cb_ident,
3807         };
3808         struct rpc_message msg = {
3809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3810                 .rpc_argp = &setclientid,
3811                 .rpc_resp = res,
3812                 .rpc_cred = cred,
3813         };
3814         __be32 *p;
3815         int loop = 0;
3816         int status;
3817
3818         p = (__be32*)sc_verifier.data;
3819         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3820         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3821
3822         for(;;) {
3823                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3824                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3825                                 clp->cl_ipaddr,
3826                                 rpc_peeraddr2str(clp->cl_rpcclient,
3827                                                         RPC_DISPLAY_ADDR),
3828                                 rpc_peeraddr2str(clp->cl_rpcclient,
3829                                                         RPC_DISPLAY_PROTO),
3830                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3831                                 clp->cl_id_uniquifier);
3832                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3833                                 sizeof(setclientid.sc_netid),
3834                                 rpc_peeraddr2str(clp->cl_rpcclient,
3835                                                         RPC_DISPLAY_NETID));
3836                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3837                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3838                                 clp->cl_ipaddr, port >> 8, port & 255);
3839
3840                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3841                 if (status != -NFS4ERR_CLID_INUSE)
3842                         break;
3843                 if (loop != 0) {
3844                         ++clp->cl_id_uniquifier;
3845                         break;
3846                 }
3847                 ++loop;
3848                 ssleep(clp->cl_lease_time / HZ + 1);
3849         }
3850         return status;
3851 }
3852
3853 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3854                 struct nfs4_setclientid_res *arg,
3855                 struct rpc_cred *cred)
3856 {
3857         struct nfs_fsinfo fsinfo;
3858         struct rpc_message msg = {
3859                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3860                 .rpc_argp = arg,
3861                 .rpc_resp = &fsinfo,
3862                 .rpc_cred = cred,
3863         };
3864         unsigned long now;
3865         int status;
3866
3867         now = jiffies;
3868         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3869         if (status == 0) {
3870                 spin_lock(&clp->cl_lock);
3871                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3872                 clp->cl_last_renewal = now;
3873                 spin_unlock(&clp->cl_lock);
3874         }
3875         return status;
3876 }
3877
3878 struct nfs4_delegreturndata {
3879         struct nfs4_delegreturnargs args;
3880         struct nfs4_delegreturnres res;
3881         struct nfs_fh fh;
3882         nfs4_stateid stateid;
3883         unsigned long timestamp;
3884         struct nfs_fattr fattr;
3885         int rpc_status;
3886 };
3887
3888 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3889 {
3890         struct nfs4_delegreturndata *data = calldata;
3891
3892         if (!nfs4_sequence_done(task, &data->res.seq_res))
3893                 return;
3894
3895         switch (task->tk_status) {
3896         case 0:
3897                 renew_lease(data->res.server, data->timestamp);
3898                 break;
3899         case -NFS4ERR_ADMIN_REVOKED:
3900         case -NFS4ERR_DELEG_REVOKED:
3901         case -NFS4ERR_BAD_STATEID:
3902         case -NFS4ERR_OLD_STATEID:
3903         case -NFS4ERR_STALE_STATEID:
3904         case -NFS4ERR_EXPIRED:
3905                 task->tk_status = 0;
3906                 break;
3907         default:
3908                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3909                                 -EAGAIN) {
3910                         rpc_restart_call_prepare(task);
3911                         return;
3912                 }
3913         }
3914         data->rpc_status = task->tk_status;
3915 }
3916
3917 static void nfs4_delegreturn_release(void *calldata)
3918 {
3919         kfree(calldata);
3920 }
3921
3922 #if defined(CONFIG_NFS_V4_1)
3923 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3924 {
3925         struct nfs4_delegreturndata *d_data;
3926
3927         d_data = (struct nfs4_delegreturndata *)data;
3928
3929         if (nfs4_setup_sequence(d_data->res.server,
3930                                 &d_data->args.seq_args,
3931                                 &d_data->res.seq_res, 1, task))
3932                 return;
3933         rpc_call_start(task);
3934 }
3935 #endif /* CONFIG_NFS_V4_1 */
3936
3937 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3938 #if defined(CONFIG_NFS_V4_1)
3939         .rpc_call_prepare = nfs4_delegreturn_prepare,
3940 #endif /* CONFIG_NFS_V4_1 */
3941         .rpc_call_done = nfs4_delegreturn_done,
3942         .rpc_release = nfs4_delegreturn_release,
3943 };
3944
3945 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3946 {
3947         struct nfs4_delegreturndata *data;
3948         struct nfs_server *server = NFS_SERVER(inode);
3949         struct rpc_task *task;
3950         struct rpc_message msg = {
3951                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3952                 .rpc_cred = cred,
3953         };
3954         struct rpc_task_setup task_setup_data = {
3955                 .rpc_client = server->client,
3956                 .rpc_message = &msg,
3957                 .callback_ops = &nfs4_delegreturn_ops,
3958                 .flags = RPC_TASK_ASYNC,
3959         };
3960         int status = 0;
3961
3962         data = kzalloc(sizeof(*data), GFP_NOFS);
3963         if (data == NULL)
3964                 return -ENOMEM;
3965         data->args.fhandle = &data->fh;
3966         data->args.stateid = &data->stateid;
3967         data->args.bitmask = server->attr_bitmask;
3968         nfs_copy_fh(&data->fh, NFS_FH(inode));
3969         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3970         data->res.fattr = &data->fattr;
3971         data->res.server = server;
3972         nfs_fattr_init(data->res.fattr);
3973         data->timestamp = jiffies;
3974         data->rpc_status = 0;
3975
3976         task_setup_data.callback_data = data;
3977         msg.rpc_argp = &data->args;
3978         msg.rpc_resp = &data->res;
3979         task = rpc_run_task(&task_setup_data);
3980         if (IS_ERR(task))
3981                 return PTR_ERR(task);
3982         if (!issync)
3983                 goto out;
3984         status = nfs4_wait_for_completion_rpc_task(task);
3985         if (status != 0)
3986                 goto out;
3987         status = data->rpc_status;
3988         if (status != 0)
3989                 goto out;
3990         nfs_refresh_inode(inode, &data->fattr);
3991 out:
3992         rpc_put_task(task);
3993         return status;
3994 }
3995
3996 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3997 {
3998         struct nfs_server *server = NFS_SERVER(inode);
3999         struct nfs4_exception exception = { };
4000         int err;
4001         do {
4002                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4003                 switch (err) {
4004                         case -NFS4ERR_STALE_STATEID:
4005                         case -NFS4ERR_EXPIRED:
4006                         case 0:
4007                                 return 0;
4008                 }
4009                 err = nfs4_handle_exception(server, err, &exception);
4010         } while (exception.retry);
4011         return err;
4012 }
4013
4014 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4015 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4016
4017 /*
4018  * sleep, with exponential backoff, and retry the LOCK operation.
4019  */
4020 static unsigned long
4021 nfs4_set_lock_task_retry(unsigned long timeout)
4022 {
4023         schedule_timeout_killable(timeout);
4024         timeout <<= 1;
4025         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4026                 return NFS4_LOCK_MAXTIMEOUT;
4027         return timeout;
4028 }
4029
4030 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4031 {
4032         struct inode *inode = state->inode;
4033         struct nfs_server *server = NFS_SERVER(inode);
4034         struct nfs_client *clp = server->nfs_client;
4035         struct nfs_lockt_args arg = {
4036                 .fh = NFS_FH(inode),
4037                 .fl = request,
4038         };
4039         struct nfs_lockt_res res = {
4040                 .denied = request,
4041         };
4042         struct rpc_message msg = {
4043                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4044                 .rpc_argp       = &arg,
4045                 .rpc_resp       = &res,
4046                 .rpc_cred       = state->owner->so_cred,
4047         };
4048         struct nfs4_lock_state *lsp;
4049         int status;
4050
4051         arg.lock_owner.clientid = clp->cl_clientid;
4052         status = nfs4_set_lock_state(state, request);
4053         if (status != 0)
4054                 goto out;
4055         lsp = request->fl_u.nfs4_fl.owner;
4056         arg.lock_owner.id = lsp->ls_id.id;
4057         arg.lock_owner.s_dev = server->s_dev;
4058         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4059         switch (status) {
4060                 case 0:
4061                         request->fl_type = F_UNLCK;
4062                         break;
4063                 case -NFS4ERR_DENIED:
4064                         status = 0;
4065         }
4066         request->fl_ops->fl_release_private(request);
4067         request->fl_ops = NULL;
4068 out:
4069         return status;
4070 }
4071
4072 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4073 {
4074         struct nfs4_exception exception = { };
4075         int err;
4076
4077         do {
4078                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4079                                 _nfs4_proc_getlk(state, cmd, request),
4080                                 &exception);
4081         } while (exception.retry);
4082         return err;
4083 }
4084
4085 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4086 {
4087         int res = 0;
4088         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4089                 case FL_POSIX:
4090                         res = posix_lock_file_wait(file, fl);
4091                         break;
4092                 case FL_FLOCK:
4093                         res = flock_lock_file_wait(file, fl);
4094                         break;
4095                 default:
4096                         BUG();
4097         }
4098         return res;
4099 }
4100
4101 struct nfs4_unlockdata {
4102         struct nfs_locku_args arg;
4103         struct nfs_locku_res res;
4104         struct nfs4_lock_state *lsp;
4105         struct nfs_open_context *ctx;
4106         struct file_lock fl;
4107         const struct nfs_server *server;
4108         unsigned long timestamp;
4109 };
4110
4111 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4112                 struct nfs_open_context *ctx,
4113                 struct nfs4_lock_state *lsp,
4114                 struct nfs_seqid *seqid)
4115 {
4116         struct nfs4_unlockdata *p;
4117         struct inode *inode = lsp->ls_state->inode;
4118
4119         p = kzalloc(sizeof(*p), GFP_NOFS);
4120         if (p == NULL)
4121                 return NULL;
4122         p->arg.fh = NFS_FH(inode);
4123         p->arg.fl = &p->fl;
4124         p->arg.seqid = seqid;
4125         p->res.seqid = seqid;
4126         p->arg.stateid = &lsp->ls_stateid;
4127         p->lsp = lsp;
4128         atomic_inc(&lsp->ls_count);
4129         /* Ensure we don't close file until we're done freeing locks! */
4130         p->ctx = get_nfs_open_context(ctx);
4131         memcpy(&p->fl, fl, sizeof(p->fl));
4132         p->server = NFS_SERVER(inode);
4133         return p;
4134 }
4135
4136 static void nfs4_locku_release_calldata(void *data)
4137 {
4138         struct nfs4_unlockdata *calldata = data;
4139         nfs_free_seqid(calldata->arg.seqid);
4140         nfs4_put_lock_state(calldata->lsp);
4141         put_nfs_open_context(calldata->ctx);
4142         kfree(calldata);
4143 }
4144
4145 static void nfs4_locku_done(struct rpc_task *task, void *data)
4146 {
4147         struct nfs4_unlockdata *calldata = data;
4148
4149         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4150                 return;
4151         switch (task->tk_status) {
4152                 case 0:
4153                         memcpy(calldata->lsp->ls_stateid.data,
4154                                         calldata->res.stateid.data,
4155                                         sizeof(calldata->lsp->ls_stateid.data));
4156                         renew_lease(calldata->server, calldata->timestamp);
4157                         break;
4158                 case -NFS4ERR_BAD_STATEID:
4159                 case -NFS4ERR_OLD_STATEID:
4160                 case -NFS4ERR_STALE_STATEID:
4161                 case -NFS4ERR_EXPIRED:
4162                         break;
4163                 default:
4164                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4165                                 rpc_restart_call_prepare(task);
4166         }
4167         nfs_release_seqid(calldata->arg.seqid);
4168 }
4169
4170 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4171 {
4172         struct nfs4_unlockdata *calldata = data;
4173
4174         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4175                 return;
4176         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4177                 /* Note: exit _without_ running nfs4_locku_done */
4178                 task->tk_action = NULL;
4179                 return;
4180         }
4181         calldata->timestamp = jiffies;
4182         if (nfs4_setup_sequence(calldata->server,
4183                                 &calldata->arg.seq_args,
4184                                 &calldata->res.seq_res,
4185                                 1, task) != 0)
4186                 nfs_release_seqid(calldata->arg.seqid);
4187         else
4188                 rpc_call_start(task);
4189 }
4190
4191 static const struct rpc_call_ops nfs4_locku_ops = {
4192         .rpc_call_prepare = nfs4_locku_prepare,
4193         .rpc_call_done = nfs4_locku_done,
4194         .rpc_release = nfs4_locku_release_calldata,
4195 };
4196
4197 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4198                 struct nfs_open_context *ctx,
4199                 struct nfs4_lock_state *lsp,
4200                 struct nfs_seqid *seqid)
4201 {
4202         struct nfs4_unlockdata *data;
4203         struct rpc_message msg = {
4204                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4205                 .rpc_cred = ctx->cred,
4206         };
4207         struct rpc_task_setup task_setup_data = {
4208                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4209                 .rpc_message = &msg,
4210                 .callback_ops = &nfs4_locku_ops,
4211                 .workqueue = nfsiod_workqueue,
4212                 .flags = RPC_TASK_ASYNC,
4213         };
4214
4215         /* Ensure this is an unlock - when canceling a lock, the
4216          * canceled lock is passed in, and it won't be an unlock.
4217          */
4218         fl->fl_type = F_UNLCK;
4219
4220         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4221         if (data == NULL) {
4222                 nfs_free_seqid(seqid);
4223                 return ERR_PTR(-ENOMEM);
4224         }
4225
4226         msg.rpc_argp = &data->arg;
4227         msg.rpc_resp = &data->res;
4228         task_setup_data.callback_data = data;
4229         return rpc_run_task(&task_setup_data);
4230 }
4231
4232 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4233 {
4234         struct nfs_inode *nfsi = NFS_I(state->inode);
4235         struct nfs_seqid *seqid;
4236         struct nfs4_lock_state *lsp;
4237         struct rpc_task *task;
4238         int status = 0;
4239         unsigned char fl_flags = request->fl_flags;
4240
4241         status = nfs4_set_lock_state(state, request);
4242         /* Unlock _before_ we do the RPC call */
4243         request->fl_flags |= FL_EXISTS;
4244         down_read(&nfsi->rwsem);
4245         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4246                 up_read(&nfsi->rwsem);
4247                 goto out;
4248         }
4249         up_read(&nfsi->rwsem);
4250         if (status != 0)
4251                 goto out;
4252         /* Is this a delegated lock? */
4253         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4254                 goto out;
4255         lsp = request->fl_u.nfs4_fl.owner;
4256         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4257         status = -ENOMEM;
4258         if (seqid == NULL)
4259                 goto out;
4260         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4261         status = PTR_ERR(task);
4262         if (IS_ERR(task))
4263                 goto out;
4264         status = nfs4_wait_for_completion_rpc_task(task);
4265         rpc_put_task(task);
4266 out:
4267         request->fl_flags = fl_flags;
4268         return status;
4269 }
4270
4271 struct nfs4_lockdata {
4272         struct nfs_lock_args arg;
4273         struct nfs_lock_res res;
4274         struct nfs4_lock_state *lsp;
4275         struct nfs_open_context *ctx;
4276         struct file_lock fl;
4277         unsigned long timestamp;
4278         int rpc_status;
4279         int cancelled;
4280         struct nfs_server *server;
4281 };
4282
4283 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4284                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4285                 gfp_t gfp_mask)
4286 {
4287         struct nfs4_lockdata *p;
4288         struct inode *inode = lsp->ls_state->inode;
4289         struct nfs_server *server = NFS_SERVER(inode);
4290
4291         p = kzalloc(sizeof(*p), gfp_mask);
4292         if (p == NULL)
4293                 return NULL;
4294
4295         p->arg.fh = NFS_FH(inode);
4296         p->arg.fl = &p->fl;
4297         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4298         if (p->arg.open_seqid == NULL)
4299                 goto out_free;
4300         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4301         if (p->arg.lock_seqid == NULL)
4302                 goto out_free_seqid;
4303         p->arg.lock_stateid = &lsp->ls_stateid;
4304         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4305         p->arg.lock_owner.id = lsp->ls_id.id;
4306         p->arg.lock_owner.s_dev = server->s_dev;
4307         p->res.lock_seqid = p->arg.lock_seqid;
4308         p->lsp = lsp;
4309         p->server = server;
4310         atomic_inc(&lsp->ls_count);
4311         p->ctx = get_nfs_open_context(ctx);
4312         memcpy(&p->fl, fl, sizeof(p->fl));
4313         return p;
4314 out_free_seqid:
4315         nfs_free_seqid(p->arg.open_seqid);
4316 out_free:
4317         kfree(p);
4318         return NULL;
4319 }
4320
4321 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4322 {
4323         struct nfs4_lockdata *data = calldata;
4324         struct nfs4_state *state = data->lsp->ls_state;
4325
4326         dprintk("%s: begin!\n", __func__);
4327         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4328                 return;
4329         /* Do we need to do an open_to_lock_owner? */
4330         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4331                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4332                         goto out_release_lock_seqid;
4333                 data->arg.open_stateid = &state->stateid;
4334                 data->arg.new_lock_owner = 1;
4335                 data->res.open_seqid = data->arg.open_seqid;
4336         } else
4337                 data->arg.new_lock_owner = 0;
4338         data->timestamp = jiffies;
4339         if (nfs4_setup_sequence(data->server,
4340                                 &data->arg.seq_args,
4341                                 &data->res.seq_res,
4342                                 1, task) == 0) {
4343                 rpc_call_start(task);
4344                 return;
4345         }
4346         nfs_release_seqid(data->arg.open_seqid);
4347 out_release_lock_seqid:
4348         nfs_release_seqid(data->arg.lock_seqid);
4349         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4350 }
4351
4352 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4353 {
4354         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4355         nfs4_lock_prepare(task, calldata);
4356 }
4357
4358 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4359 {
4360         struct nfs4_lockdata *data = calldata;
4361
4362         dprintk("%s: begin!\n", __func__);
4363
4364         if (!nfs4_sequence_done(task, &data->res.seq_res))
4365                 return;
4366
4367         data->rpc_status = task->tk_status;
4368         if (data->arg.new_lock_owner != 0) {
4369                 if (data->rpc_status == 0)
4370                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4371                 else
4372                         goto out;
4373         }
4374         if (data->rpc_status == 0) {
4375                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4376                                         sizeof(data->lsp->ls_stateid.data));
4377                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4378                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4379         }
4380 out:
4381         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4382 }
4383
4384 static void nfs4_lock_release(void *calldata)
4385 {
4386         struct nfs4_lockdata *data = calldata;
4387
4388         dprintk("%s: begin!\n", __func__);
4389         nfs_free_seqid(data->arg.open_seqid);
4390         if (data->cancelled != 0) {
4391                 struct rpc_task *task;
4392                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4393                                 data->arg.lock_seqid);
4394                 if (!IS_ERR(task))
4395                         rpc_put_task_async(task);
4396                 dprintk("%s: cancelling lock!\n", __func__);
4397         } else
4398                 nfs_free_seqid(data->arg.lock_seqid);
4399         nfs4_put_lock_state(data->lsp);
4400         put_nfs_open_context(data->ctx);
4401         kfree(data);
4402         dprintk("%s: done!\n", __func__);
4403 }
4404
4405 static const struct rpc_call_ops nfs4_lock_ops = {
4406         .rpc_call_prepare = nfs4_lock_prepare,
4407         .rpc_call_done = nfs4_lock_done,
4408         .rpc_release = nfs4_lock_release,
4409 };
4410
4411 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4412         .rpc_call_prepare = nfs4_recover_lock_prepare,
4413         .rpc_call_done = nfs4_lock_done,
4414         .rpc_release = nfs4_lock_release,
4415 };
4416
4417 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4418 {
4419         switch (error) {
4420         case -NFS4ERR_ADMIN_REVOKED:
4421         case -NFS4ERR_BAD_STATEID:
4422                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4423                 if (new_lock_owner != 0 ||
4424                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4425                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4426                 break;
4427         case -NFS4ERR_STALE_STATEID:
4428                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4429         case -NFS4ERR_EXPIRED:
4430                 nfs4_schedule_lease_recovery(server->nfs_client);
4431         };
4432 }
4433
4434 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4435 {
4436         struct nfs4_lockdata *data;
4437         struct rpc_task *task;
4438         struct rpc_message msg = {
4439                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4440                 .rpc_cred = state->owner->so_cred,
4441         };
4442         struct rpc_task_setup task_setup_data = {
4443                 .rpc_client = NFS_CLIENT(state->inode),
4444                 .rpc_message = &msg,
4445                 .callback_ops = &nfs4_lock_ops,
4446                 .workqueue = nfsiod_workqueue,
4447                 .flags = RPC_TASK_ASYNC,
4448         };
4449         int ret;
4450
4451         dprintk("%s: begin!\n", __func__);
4452         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4453                         fl->fl_u.nfs4_fl.owner,
4454                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4455         if (data == NULL)
4456                 return -ENOMEM;
4457         if (IS_SETLKW(cmd))
4458                 data->arg.block = 1;
4459         if (recovery_type > NFS_LOCK_NEW) {
4460                 if (recovery_type == NFS_LOCK_RECLAIM)
4461                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4462                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4463         }
4464         msg.rpc_argp = &data->arg;
4465         msg.rpc_resp = &data->res;
4466         task_setup_data.callback_data = data;
4467         task = rpc_run_task(&task_setup_data);
4468         if (IS_ERR(task))
4469                 return PTR_ERR(task);
4470         ret = nfs4_wait_for_completion_rpc_task(task);
4471         if (ret == 0) {
4472                 ret = data->rpc_status;
4473                 if (ret)
4474                         nfs4_handle_setlk_error(data->server, data->lsp,
4475                                         data->arg.new_lock_owner, ret);
4476         } else
4477                 data->cancelled = 1;
4478         rpc_put_task(task);
4479         dprintk("%s: done, ret = %d!\n", __func__, ret);
4480         return ret;
4481 }
4482
4483 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4484 {
4485         struct nfs_server *server = NFS_SERVER(state->inode);
4486         struct nfs4_exception exception = {
4487                 .inode = state->inode,
4488         };
4489         int err;
4490
4491         do {
4492                 /* Cache the lock if possible... */
4493                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4494                         return 0;
4495                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4496                 if (err != -NFS4ERR_DELAY)
4497                         break;
4498                 nfs4_handle_exception(server, err, &exception);
4499         } while (exception.retry);
4500         return err;
4501 }
4502
4503 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4504 {
4505         struct nfs_server *server = NFS_SERVER(state->inode);
4506         struct nfs4_exception exception = {
4507                 .inode = state->inode,
4508         };
4509         int err;
4510
4511         err = nfs4_set_lock_state(state, request);
4512         if (err != 0)
4513                 return err;
4514         do {
4515                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4516                         return 0;
4517                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4518                 switch (err) {
4519                 default:
4520                         goto out;
4521                 case -NFS4ERR_GRACE:
4522                 case -NFS4ERR_DELAY:
4523                         nfs4_handle_exception(server, err, &exception);
4524                         err = 0;
4525                 }
4526         } while (exception.retry);
4527 out:
4528         return err;
4529 }
4530
4531 #if defined(CONFIG_NFS_V4_1)
4532 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4533 {
4534         int status;
4535         struct nfs_server *server = NFS_SERVER(state->inode);
4536
4537         status = nfs41_test_stateid(server, state);
4538         if (status == NFS_OK)
4539                 return 0;
4540         nfs41_free_stateid(server, state);
4541         return nfs4_lock_expired(state, request);
4542 }
4543 #endif
4544
4545 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4546 {
4547         struct nfs_inode *nfsi = NFS_I(state->inode);
4548         unsigned char fl_flags = request->fl_flags;
4549         int status = -ENOLCK;
4550
4551         if ((fl_flags & FL_POSIX) &&
4552                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4553                 goto out;
4554         /* Is this a delegated open? */
4555         status = nfs4_set_lock_state(state, request);
4556         if (status != 0)
4557                 goto out;
4558         request->fl_flags |= FL_ACCESS;
4559         status = do_vfs_lock(request->fl_file, request);
4560         if (status < 0)
4561                 goto out;
4562         down_read(&nfsi->rwsem);
4563         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4564                 /* Yes: cache locks! */
4565                 /* ...but avoid races with delegation recall... */
4566                 request->fl_flags = fl_flags & ~FL_SLEEP;
4567                 status = do_vfs_lock(request->fl_file, request);
4568                 goto out_unlock;
4569         }
4570         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4571         if (status != 0)
4572                 goto out_unlock;
4573         /* Note: we always want to sleep here! */
4574         request->fl_flags = fl_flags | FL_SLEEP;
4575         if (do_vfs_lock(request->fl_file, request) < 0)
4576                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4577 out_unlock:
4578         up_read(&nfsi->rwsem);
4579 out:
4580         request->fl_flags = fl_flags;
4581         return status;
4582 }
4583
4584 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4585 {
4586         struct nfs4_exception exception = {
4587                 .state = state,
4588                 .inode = state->inode,
4589         };
4590         int err;
4591
4592         do {
4593                 err = _nfs4_proc_setlk(state, cmd, request);
4594                 if (err == -NFS4ERR_DENIED)
4595                         err = -EAGAIN;
4596                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4597                                 err, &exception);
4598         } while (exception.retry);
4599         return err;
4600 }
4601
4602 static int
4603 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4604 {
4605         struct nfs_open_context *ctx;
4606         struct nfs4_state *state;
4607         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4608         int status;
4609
4610         /* verify open state */
4611         ctx = nfs_file_open_context(filp);
4612         state = ctx->state;
4613
4614         if (request->fl_start < 0 || request->fl_end < 0)
4615                 return -EINVAL;
4616
4617         if (IS_GETLK(cmd)) {
4618                 if (state != NULL)
4619                         return nfs4_proc_getlk(state, F_GETLK, request);
4620                 return 0;
4621         }
4622
4623         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4624                 return -EINVAL;
4625
4626         if (request->fl_type == F_UNLCK) {
4627                 if (state != NULL)
4628                         return nfs4_proc_unlck(state, cmd, request);
4629                 return 0;
4630         }
4631
4632         if (state == NULL)
4633                 return -ENOLCK;
4634         /*
4635          * Don't rely on the VFS having checked the file open mode,
4636          * since it won't do this for flock() locks.
4637          */
4638         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4639         case F_RDLCK:
4640                 if (!(filp->f_mode & FMODE_READ))
4641                         return -EBADF;
4642                 break;
4643         case F_WRLCK:
4644                 if (!(filp->f_mode & FMODE_WRITE))
4645                         return -EBADF;
4646         }
4647
4648         do {
4649                 status = nfs4_proc_setlk(state, cmd, request);
4650                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4651                         break;
4652                 timeout = nfs4_set_lock_task_retry(timeout);
4653                 status = -ERESTARTSYS;
4654                 if (signalled())
4655                         break;
4656         } while(status < 0);
4657         return status;
4658 }
4659
4660 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4661 {
4662         struct nfs_server *server = NFS_SERVER(state->inode);
4663         struct nfs4_exception exception = { };
4664         int err;
4665
4666         err = nfs4_set_lock_state(state, fl);
4667         if (err != 0)
4668                 goto out;
4669         do {
4670                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4671                 switch (err) {
4672                         default:
4673                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4674                                                 __func__, err);
4675                         case 0:
4676                         case -ESTALE:
4677                                 goto out;
4678                         case -NFS4ERR_EXPIRED:
4679                                 nfs4_schedule_stateid_recovery(server, state);
4680                         case -NFS4ERR_STALE_CLIENTID:
4681                         case -NFS4ERR_STALE_STATEID:
4682                                 nfs4_schedule_lease_recovery(server->nfs_client);
4683                                 goto out;
4684                         case -NFS4ERR_BADSESSION:
4685                         case -NFS4ERR_BADSLOT:
4686                         case -NFS4ERR_BAD_HIGH_SLOT:
4687                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4688                         case -NFS4ERR_DEADSESSION:
4689                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4690                                 goto out;
4691                         case -ERESTARTSYS:
4692                                 /*
4693                                  * The show must go on: exit, but mark the
4694                                  * stateid as needing recovery.
4695                                  */
4696                         case -NFS4ERR_DELEG_REVOKED:
4697                         case -NFS4ERR_ADMIN_REVOKED:
4698                         case -NFS4ERR_BAD_STATEID:
4699                         case -NFS4ERR_OPENMODE:
4700                                 nfs4_schedule_stateid_recovery(server, state);
4701                                 err = 0;
4702                                 goto out;
4703                         case -EKEYEXPIRED:
4704                                 /*
4705                                  * User RPCSEC_GSS context has expired.
4706                                  * We cannot recover this stateid now, so
4707                                  * skip it and allow recovery thread to
4708                                  * proceed.
4709                                  */
4710                                 err = 0;
4711                                 goto out;
4712                         case -ENOMEM:
4713                         case -NFS4ERR_DENIED:
4714                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4715                                 err = 0;
4716                                 goto out;
4717                         case -NFS4ERR_DELAY:
4718                                 break;
4719                 }
4720                 err = nfs4_handle_exception(server, err, &exception);
4721         } while (exception.retry);
4722 out:
4723         return err;
4724 }
4725
4726 static void nfs4_release_lockowner_release(void *calldata)
4727 {
4728         kfree(calldata);
4729 }
4730
4731 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4732         .rpc_release = nfs4_release_lockowner_release,
4733 };
4734
4735 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4736 {
4737         struct nfs_server *server = lsp->ls_state->owner->so_server;
4738         struct nfs_release_lockowner_args *args;
4739         struct rpc_message msg = {
4740                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4741         };
4742
4743         if (server->nfs_client->cl_mvops->minor_version != 0)
4744                 return;
4745         args = kmalloc(sizeof(*args), GFP_NOFS);
4746         if (!args)
4747                 return;
4748         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4749         args->lock_owner.id = lsp->ls_id.id;
4750         args->lock_owner.s_dev = server->s_dev;
4751         msg.rpc_argp = args;
4752         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4753 }
4754
4755 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4756
4757 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4758                                    const void *buf, size_t buflen,
4759                                    int flags, int type)
4760 {
4761         if (strcmp(key, "") != 0)
4762                 return -EINVAL;
4763
4764         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4765 }
4766
4767 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4768                                    void *buf, size_t buflen, int type)
4769 {
4770         if (strcmp(key, "") != 0)
4771                 return -EINVAL;
4772
4773         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4774 }
4775
4776 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4777                                        size_t list_len, const char *name,
4778                                        size_t name_len, int type)
4779 {
4780         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4781
4782         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4783                 return 0;
4784
4785         if (list && len <= list_len)
4786                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4787         return len;
4788 }
4789
4790 /*
4791  * nfs_fhget will use either the mounted_on_fileid or the fileid
4792  */
4793 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4794 {
4795         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4796                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4797               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4798               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4799                 return;
4800
4801         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4802                 NFS_ATTR_FATTR_NLINK;
4803         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4804         fattr->nlink = 2;
4805 }
4806
4807 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4808                 struct nfs4_fs_locations *fs_locations, struct page *page)
4809 {
4810         struct nfs_server *server = NFS_SERVER(dir);
4811         u32 bitmask[2] = {
4812                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4813         };
4814         struct nfs4_fs_locations_arg args = {
4815                 .dir_fh = NFS_FH(dir),
4816                 .name = name,
4817                 .page = page,
4818                 .bitmask = bitmask,
4819         };
4820         struct nfs4_fs_locations_res res = {
4821                 .fs_locations = fs_locations,
4822         };
4823         struct rpc_message msg = {
4824                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4825                 .rpc_argp = &args,
4826                 .rpc_resp = &res,
4827         };
4828         int status;
4829
4830         dprintk("%s: start\n", __func__);
4831
4832         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4833          * is not supported */
4834         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4835                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4836         else
4837                 bitmask[0] |= FATTR4_WORD0_FILEID;
4838
4839         nfs_fattr_init(&fs_locations->fattr);
4840         fs_locations->server = server;
4841         fs_locations->nlocations = 0;
4842         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4843         dprintk("%s: returned status = %d\n", __func__, status);
4844         return status;
4845 }
4846
4847 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4848 {
4849         int status;
4850         struct nfs4_secinfo_arg args = {
4851                 .dir_fh = NFS_FH(dir),
4852                 .name   = name,
4853         };
4854         struct nfs4_secinfo_res res = {
4855                 .flavors     = flavors,
4856         };
4857         struct rpc_message msg = {
4858                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4859                 .rpc_argp = &args,
4860                 .rpc_resp = &res,
4861         };
4862
4863         dprintk("NFS call  secinfo %s\n", name->name);
4864         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4865         dprintk("NFS reply  secinfo: %d\n", status);
4866         return status;
4867 }
4868
4869 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4870 {
4871         struct nfs4_exception exception = { };
4872         int err;
4873         do {
4874                 err = nfs4_handle_exception(NFS_SERVER(dir),
4875                                 _nfs4_proc_secinfo(dir, name, flavors),
4876                                 &exception);
4877         } while (exception.retry);
4878         return err;
4879 }
4880
4881 #ifdef CONFIG_NFS_V4_1
4882 /*
4883  * Check the exchange flags returned by the server for invalid flags, having
4884  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4885  * DS flags set.
4886  */
4887 static int nfs4_check_cl_exchange_flags(u32 flags)
4888 {
4889         if (flags & ~EXCHGID4_FLAG_MASK_R)
4890                 goto out_inval;
4891         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4892             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4893                 goto out_inval;
4894         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4895                 goto out_inval;
4896         return NFS_OK;
4897 out_inval:
4898         return -NFS4ERR_INVAL;
4899 }
4900
4901 static bool
4902 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4903 {
4904         if (a->server_scope_sz == b->server_scope_sz &&
4905             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4906                 return true;
4907
4908         return false;
4909 }
4910
4911 /*
4912  * nfs4_proc_exchange_id()
4913  *
4914  * Since the clientid has expired, all compounds using sessions
4915  * associated with the stale clientid will be returning
4916  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4917  * be in some phase of session reset.
4918  */
4919 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4920 {
4921         nfs4_verifier verifier;
4922         struct nfs41_exchange_id_args args = {
4923                 .client = clp,
4924                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4925         };
4926         struct nfs41_exchange_id_res res = {
4927                 .client = clp,
4928         };
4929         int status;
4930         struct rpc_message msg = {
4931                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4932                 .rpc_argp = &args,
4933                 .rpc_resp = &res,
4934                 .rpc_cred = cred,
4935         };
4936         __be32 *p;
4937
4938         dprintk("--> %s\n", __func__);
4939         BUG_ON(clp == NULL);
4940
4941         p = (u32 *)verifier.data;
4942         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4943         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4944         args.verifier = &verifier;
4945
4946         args.id_len = scnprintf(args.id, sizeof(args.id),
4947                                 "%s/%s.%s/%u",
4948                                 clp->cl_ipaddr,
4949                                 init_utsname()->nodename,
4950                                 init_utsname()->domainname,
4951                                 clp->cl_rpcclient->cl_auth->au_flavor);
4952
4953         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4954         if (unlikely(!res.server_scope)) {
4955                 status = -ENOMEM;
4956                 goto out;
4957         }
4958
4959         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4960         if (!status)
4961                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4962
4963         if (!status) {
4964                 if (clp->server_scope &&
4965                     !nfs41_same_server_scope(clp->server_scope,
4966                                              res.server_scope)) {
4967                         dprintk("%s: server_scope mismatch detected\n",
4968                                 __func__);
4969                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4970                         kfree(clp->server_scope);
4971                         clp->server_scope = NULL;
4972                 }
4973
4974                 if (!clp->server_scope) {
4975                         clp->server_scope = res.server_scope;
4976                         goto out;
4977                 }
4978         }
4979         kfree(res.server_scope);
4980 out:
4981         dprintk("<-- %s status= %d\n", __func__, status);
4982         return status;
4983 }
4984
4985 struct nfs4_get_lease_time_data {
4986         struct nfs4_get_lease_time_args *args;
4987         struct nfs4_get_lease_time_res *res;
4988         struct nfs_client *clp;
4989 };
4990
4991 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4992                                         void *calldata)
4993 {
4994         int ret;
4995         struct nfs4_get_lease_time_data *data =
4996                         (struct nfs4_get_lease_time_data *)calldata;
4997
4998         dprintk("--> %s\n", __func__);
4999         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5000         /* just setup sequence, do not trigger session recovery
5001            since we're invoked within one */
5002         ret = nfs41_setup_sequence(data->clp->cl_session,
5003                                    &data->args->la_seq_args,
5004                                    &data->res->lr_seq_res, 0, task);
5005
5006         BUG_ON(ret == -EAGAIN);
5007         rpc_call_start(task);
5008         dprintk("<-- %s\n", __func__);
5009 }
5010
5011 /*
5012  * Called from nfs4_state_manager thread for session setup, so don't recover
5013  * from sequence operation or clientid errors.
5014  */
5015 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5016 {
5017         struct nfs4_get_lease_time_data *data =
5018                         (struct nfs4_get_lease_time_data *)calldata;
5019
5020         dprintk("--> %s\n", __func__);
5021         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5022                 return;
5023         switch (task->tk_status) {
5024         case -NFS4ERR_DELAY:
5025         case -NFS4ERR_GRACE:
5026                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5027                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5028                 task->tk_status = 0;
5029                 /* fall through */
5030         case -NFS4ERR_RETRY_UNCACHED_REP:
5031                 rpc_restart_call_prepare(task);
5032                 return;
5033         }
5034         dprintk("<-- %s\n", __func__);
5035 }
5036
5037 struct rpc_call_ops nfs4_get_lease_time_ops = {
5038         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5039         .rpc_call_done = nfs4_get_lease_time_done,
5040 };
5041
5042 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5043 {
5044         struct rpc_task *task;
5045         struct nfs4_get_lease_time_args args;
5046         struct nfs4_get_lease_time_res res = {
5047                 .lr_fsinfo = fsinfo,
5048         };
5049         struct nfs4_get_lease_time_data data = {
5050                 .args = &args,
5051                 .res = &res,
5052                 .clp = clp,
5053         };
5054         struct rpc_message msg = {
5055                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5056                 .rpc_argp = &args,
5057                 .rpc_resp = &res,
5058         };
5059         struct rpc_task_setup task_setup = {
5060                 .rpc_client = clp->cl_rpcclient,
5061                 .rpc_message = &msg,
5062                 .callback_ops = &nfs4_get_lease_time_ops,
5063                 .callback_data = &data,
5064                 .flags = RPC_TASK_TIMEOUT,
5065         };
5066         int status;
5067
5068         dprintk("--> %s\n", __func__);
5069         task = rpc_run_task(&task_setup);
5070
5071         if (IS_ERR(task))
5072                 status = PTR_ERR(task);
5073         else {
5074                 status = task->tk_status;
5075                 rpc_put_task(task);
5076         }
5077         dprintk("<-- %s return %d\n", __func__, status);
5078
5079         return status;
5080 }
5081
5082 /*
5083  * Reset a slot table
5084  */
5085 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5086                                  int ivalue)
5087 {
5088         struct nfs4_slot *new = NULL;
5089         int i;
5090         int ret = 0;
5091
5092         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5093                 max_reqs, tbl->max_slots);
5094
5095         /* Does the newly negotiated max_reqs match the existing slot table? */
5096         if (max_reqs != tbl->max_slots) {
5097                 ret = -ENOMEM;
5098                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5099                               GFP_NOFS);
5100                 if (!new)
5101                         goto out;
5102                 ret = 0;
5103                 kfree(tbl->slots);
5104         }
5105         spin_lock(&tbl->slot_tbl_lock);
5106         if (new) {
5107                 tbl->slots = new;
5108                 tbl->max_slots = max_reqs;
5109         }
5110         for (i = 0; i < tbl->max_slots; ++i)
5111                 tbl->slots[i].seq_nr = ivalue;
5112         spin_unlock(&tbl->slot_tbl_lock);
5113         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5114                 tbl, tbl->slots, tbl->max_slots);
5115 out:
5116         dprintk("<-- %s: return %d\n", __func__, ret);
5117         return ret;
5118 }
5119
5120 /*
5121  * Reset the forechannel and backchannel slot tables
5122  */
5123 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5124 {
5125         int status;
5126
5127         status = nfs4_reset_slot_table(&session->fc_slot_table,
5128                         session->fc_attrs.max_reqs, 1);
5129         if (status)
5130                 return status;
5131
5132         status = nfs4_reset_slot_table(&session->bc_slot_table,
5133                         session->bc_attrs.max_reqs, 0);
5134         return status;
5135 }
5136
5137 /* Destroy the slot table */
5138 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5139 {
5140         if (session->fc_slot_table.slots != NULL) {
5141                 kfree(session->fc_slot_table.slots);
5142                 session->fc_slot_table.slots = NULL;
5143         }
5144         if (session->bc_slot_table.slots != NULL) {
5145                 kfree(session->bc_slot_table.slots);
5146                 session->bc_slot_table.slots = NULL;
5147         }
5148         return;
5149 }
5150
5151 /*
5152  * Initialize slot table
5153  */
5154 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5155                 int max_slots, int ivalue)
5156 {
5157         struct nfs4_slot *slot;
5158         int ret = -ENOMEM;
5159
5160         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5161
5162         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5163
5164         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5165         if (!slot)
5166                 goto out;
5167         ret = 0;
5168
5169         spin_lock(&tbl->slot_tbl_lock);
5170         tbl->max_slots = max_slots;
5171         tbl->slots = slot;
5172         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5173         spin_unlock(&tbl->slot_tbl_lock);
5174         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5175                 tbl, tbl->slots, tbl->max_slots);
5176 out:
5177         dprintk("<-- %s: return %d\n", __func__, ret);
5178         return ret;
5179 }
5180
5181 /*
5182  * Initialize the forechannel and backchannel tables
5183  */
5184 static int nfs4_init_slot_tables(struct nfs4_session *session)
5185 {
5186         struct nfs4_slot_table *tbl;
5187         int status = 0;
5188
5189         tbl = &session->fc_slot_table;
5190         if (tbl->slots == NULL) {
5191                 status = nfs4_init_slot_table(tbl,
5192                                 session->fc_attrs.max_reqs, 1);
5193                 if (status)
5194                         return status;
5195         }
5196
5197         tbl = &session->bc_slot_table;
5198         if (tbl->slots == NULL) {
5199                 status = nfs4_init_slot_table(tbl,
5200                                 session->bc_attrs.max_reqs, 0);
5201                 if (status)
5202                         nfs4_destroy_slot_tables(session);
5203         }
5204
5205         return status;
5206 }
5207
5208 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5209 {
5210         struct nfs4_session *session;
5211         struct nfs4_slot_table *tbl;
5212
5213         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5214         if (!session)
5215                 return NULL;
5216
5217         tbl = &session->fc_slot_table;
5218         tbl->highest_used_slotid = -1;
5219         spin_lock_init(&tbl->slot_tbl_lock);
5220         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5221         init_completion(&tbl->complete);
5222
5223         tbl = &session->bc_slot_table;
5224         tbl->highest_used_slotid = -1;
5225         spin_lock_init(&tbl->slot_tbl_lock);
5226         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5227         init_completion(&tbl->complete);
5228
5229         session->session_state = 1<<NFS4_SESSION_INITING;
5230
5231         session->clp = clp;
5232         return session;
5233 }
5234
5235 void nfs4_destroy_session(struct nfs4_session *session)
5236 {
5237         nfs4_proc_destroy_session(session);
5238         dprintk("%s Destroy backchannel for xprt %p\n",
5239                 __func__, session->clp->cl_rpcclient->cl_xprt);
5240         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5241                                 NFS41_BC_MIN_CALLBACKS);
5242         nfs4_destroy_slot_tables(session);
5243         kfree(session);
5244 }
5245
5246 /*
5247  * Initialize the values to be used by the client in CREATE_SESSION
5248  * If nfs4_init_session set the fore channel request and response sizes,
5249  * use them.
5250  *
5251  * Set the back channel max_resp_sz_cached to zero to force the client to
5252  * always set csa_cachethis to FALSE because the current implementation
5253  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5254  */
5255 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5256 {
5257         struct nfs4_session *session = args->client->cl_session;
5258         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5259                      mxresp_sz = session->fc_attrs.max_resp_sz;
5260
5261         if (mxrqst_sz == 0)
5262                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5263         if (mxresp_sz == 0)
5264                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5265         /* Fore channel attributes */
5266         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5267         args->fc_attrs.max_resp_sz = mxresp_sz;
5268         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5269         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5270
5271         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5272                 "max_ops=%u max_reqs=%u\n",
5273                 __func__,
5274                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5275                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5276
5277         /* Back channel attributes */
5278         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5279         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5280         args->bc_attrs.max_resp_sz_cached = 0;
5281         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5282         args->bc_attrs.max_reqs = 1;
5283
5284         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5285                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5286                 __func__,
5287                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5288                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5289                 args->bc_attrs.max_reqs);
5290 }
5291
5292 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5293 {
5294         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5295         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5296
5297         if (rcvd->max_resp_sz > sent->max_resp_sz)
5298                 return -EINVAL;
5299         /*
5300          * Our requested max_ops is the minimum we need; we're not
5301          * prepared to break up compounds into smaller pieces than that.
5302          * So, no point even trying to continue if the server won't
5303          * cooperate:
5304          */
5305         if (rcvd->max_ops < sent->max_ops)
5306                 return -EINVAL;
5307         if (rcvd->max_reqs == 0)
5308                 return -EINVAL;
5309         return 0;
5310 }
5311
5312 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5313 {
5314         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5315         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5316
5317         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5318                 return -EINVAL;
5319         if (rcvd->max_resp_sz < sent->max_resp_sz)
5320                 return -EINVAL;
5321         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5322                 return -EINVAL;
5323         /* These would render the backchannel useless: */
5324         if (rcvd->max_ops  == 0)
5325                 return -EINVAL;
5326         if (rcvd->max_reqs == 0)
5327                 return -EINVAL;
5328         return 0;
5329 }
5330
5331 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5332                                      struct nfs4_session *session)
5333 {
5334         int ret;
5335
5336         ret = nfs4_verify_fore_channel_attrs(args, session);
5337         if (ret)
5338                 return ret;
5339         return nfs4_verify_back_channel_attrs(args, session);
5340 }
5341
5342 static int _nfs4_proc_create_session(struct nfs_client *clp)
5343 {
5344         struct nfs4_session *session = clp->cl_session;
5345         struct nfs41_create_session_args args = {
5346                 .client = clp,
5347                 .cb_program = NFS4_CALLBACK,
5348         };
5349         struct nfs41_create_session_res res = {
5350                 .client = clp,
5351         };
5352         struct rpc_message msg = {
5353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5354                 .rpc_argp = &args,
5355                 .rpc_resp = &res,
5356         };
5357         int status;
5358
5359         nfs4_init_channel_attrs(&args);
5360         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5361
5362         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5363
5364         if (!status)
5365                 /* Verify the session's negotiated channel_attrs values */
5366                 status = nfs4_verify_channel_attrs(&args, session);
5367         if (!status) {
5368                 /* Increment the clientid slot sequence id */
5369                 clp->cl_seqid++;
5370         }
5371
5372         return status;
5373 }
5374
5375 /*
5376  * Issues a CREATE_SESSION operation to the server.
5377  * It is the responsibility of the caller to verify the session is
5378  * expired before calling this routine.
5379  */
5380 int nfs4_proc_create_session(struct nfs_client *clp)
5381 {
5382         int status;
5383         unsigned *ptr;
5384         struct nfs4_session *session = clp->cl_session;
5385
5386         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5387
5388         status = _nfs4_proc_create_session(clp);
5389         if (status)
5390                 goto out;
5391
5392         /* Init and reset the fore channel */
5393         status = nfs4_init_slot_tables(session);
5394         dprintk("slot table initialization returned %d\n", status);
5395         if (status)
5396                 goto out;
5397         status = nfs4_reset_slot_tables(session);
5398         dprintk("slot table reset returned %d\n", status);
5399         if (status)
5400                 goto out;
5401
5402         ptr = (unsigned *)&session->sess_id.data[0];
5403         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5404                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5405 out:
5406         dprintk("<-- %s\n", __func__);
5407         return status;
5408 }
5409
5410 /*
5411  * Issue the over-the-wire RPC DESTROY_SESSION.
5412  * The caller must serialize access to this routine.
5413  */
5414 int nfs4_proc_destroy_session(struct nfs4_session *session)
5415 {
5416         int status = 0;
5417         struct rpc_message msg;
5418
5419         dprintk("--> nfs4_proc_destroy_session\n");
5420
5421         /* session is still being setup */
5422         if (session->clp->cl_cons_state != NFS_CS_READY)
5423                 return status;
5424
5425         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5426         msg.rpc_argp = session;
5427         msg.rpc_resp = NULL;
5428         msg.rpc_cred = NULL;
5429         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5430
5431         if (status)
5432                 printk(KERN_WARNING
5433                         "Got error %d from the server on DESTROY_SESSION. "
5434                         "Session has been destroyed regardless...\n", status);
5435
5436         dprintk("<-- nfs4_proc_destroy_session\n");
5437         return status;
5438 }
5439
5440 int nfs4_init_session(struct nfs_server *server)
5441 {
5442         struct nfs_client *clp = server->nfs_client;
5443         struct nfs4_session *session;
5444         unsigned int rsize, wsize;
5445         int ret;
5446
5447         if (!nfs4_has_session(clp))
5448                 return 0;
5449
5450         session = clp->cl_session;
5451         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5452                 return 0;
5453
5454         rsize = server->rsize;
5455         if (rsize == 0)
5456                 rsize = NFS_MAX_FILE_IO_SIZE;
5457         wsize = server->wsize;
5458         if (wsize == 0)
5459                 wsize = NFS_MAX_FILE_IO_SIZE;
5460
5461         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5462         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5463
5464         ret = nfs4_recover_expired_lease(server);
5465         if (!ret)
5466                 ret = nfs4_check_client_ready(clp);
5467         return ret;
5468 }
5469
5470 int nfs4_init_ds_session(struct nfs_client *clp)
5471 {
5472         struct nfs4_session *session = clp->cl_session;
5473         int ret;
5474
5475         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5476                 return 0;
5477
5478         ret = nfs4_client_recover_expired_lease(clp);
5479         if (!ret)
5480                 /* Test for the DS role */
5481                 if (!is_ds_client(clp))
5482                         ret = -ENODEV;
5483         if (!ret)
5484                 ret = nfs4_check_client_ready(clp);
5485         return ret;
5486
5487 }
5488 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5489
5490
5491 /*
5492  * Renew the cl_session lease.
5493  */
5494 struct nfs4_sequence_data {
5495         struct nfs_client *clp;
5496         struct nfs4_sequence_args args;
5497         struct nfs4_sequence_res res;
5498 };
5499
5500 static void nfs41_sequence_release(void *data)
5501 {
5502         struct nfs4_sequence_data *calldata = data;
5503         struct nfs_client *clp = calldata->clp;
5504
5505         if (atomic_read(&clp->cl_count) > 1)
5506                 nfs4_schedule_state_renewal(clp);
5507         nfs_put_client(clp);
5508         kfree(calldata);
5509 }
5510
5511 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5512 {
5513         switch(task->tk_status) {
5514         case -NFS4ERR_DELAY:
5515                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5516                 return -EAGAIN;
5517         default:
5518                 nfs4_schedule_lease_recovery(clp);
5519         }
5520         return 0;
5521 }
5522
5523 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5524 {
5525         struct nfs4_sequence_data *calldata = data;
5526         struct nfs_client *clp = calldata->clp;
5527
5528         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5529                 return;
5530
5531         if (task->tk_status < 0) {
5532                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5533                 if (atomic_read(&clp->cl_count) == 1)
5534                         goto out;
5535
5536                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5537                         rpc_restart_call_prepare(task);
5538                         return;
5539                 }
5540         }
5541         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5542 out:
5543         dprintk("<-- %s\n", __func__);
5544 }
5545
5546 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5547 {
5548         struct nfs4_sequence_data *calldata = data;
5549         struct nfs_client *clp = calldata->clp;
5550         struct nfs4_sequence_args *args;
5551         struct nfs4_sequence_res *res;
5552
5553         args = task->tk_msg.rpc_argp;
5554         res = task->tk_msg.rpc_resp;
5555
5556         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5557                 return;
5558         rpc_call_start(task);
5559 }
5560
5561 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
5562 {
5563         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5564         nfs41_sequence_prepare(task, data);
5565 }
5566
5567 static const struct rpc_call_ops nfs41_sequence_ops = {
5568         .rpc_call_done = nfs41_sequence_call_done,
5569         .rpc_call_prepare = nfs41_sequence_prepare,
5570         .rpc_release = nfs41_sequence_release,
5571 };
5572
5573 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
5574         .rpc_call_done = nfs41_sequence_call_done,
5575         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
5576         .rpc_release = nfs41_sequence_release,
5577 };
5578
5579 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
5580                                              const struct rpc_call_ops *seq_ops)
5581 {
5582         struct nfs4_sequence_data *calldata;
5583         struct rpc_message msg = {
5584                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5585                 .rpc_cred = cred,
5586         };
5587         struct rpc_task_setup task_setup_data = {
5588                 .rpc_client = clp->cl_rpcclient,
5589                 .rpc_message = &msg,
5590                 .callback_ops = seq_ops,
5591                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5592         };
5593
5594         if (!atomic_inc_not_zero(&clp->cl_count))
5595                 return ERR_PTR(-EIO);
5596         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5597         if (calldata == NULL) {
5598                 nfs_put_client(clp);
5599                 return ERR_PTR(-ENOMEM);
5600         }
5601         msg.rpc_argp = &calldata->args;
5602         msg.rpc_resp = &calldata->res;
5603         calldata->clp = clp;
5604         task_setup_data.callback_data = calldata;
5605
5606         return rpc_run_task(&task_setup_data);
5607 }
5608
5609 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5610 {
5611         struct rpc_task *task;
5612         int ret = 0;
5613
5614         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5615                 return -EAGAIN;
5616         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
5617         if (IS_ERR(task))
5618                 ret = PTR_ERR(task);
5619         else
5620                 rpc_put_task_async(task);
5621         dprintk("<-- %s status=%d\n", __func__, ret);
5622         return ret;
5623 }
5624
5625 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5626 {
5627         struct rpc_task *task;
5628         int ret;
5629
5630         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
5631         if (IS_ERR(task)) {
5632                 ret = PTR_ERR(task);
5633                 goto out;
5634         }
5635         ret = rpc_wait_for_completion_task(task);
5636         if (!ret) {
5637                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5638
5639                 if (task->tk_status == 0)
5640                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5641                 ret = task->tk_status;
5642         }
5643         rpc_put_task(task);
5644 out:
5645         dprintk("<-- %s status=%d\n", __func__, ret);
5646         return ret;
5647 }
5648
5649 struct nfs4_reclaim_complete_data {
5650         struct nfs_client *clp;
5651         struct nfs41_reclaim_complete_args arg;
5652         struct nfs41_reclaim_complete_res res;
5653 };
5654
5655 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5656 {
5657         struct nfs4_reclaim_complete_data *calldata = data;
5658
5659         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5660         if (nfs41_setup_sequence(calldata->clp->cl_session,
5661                                 &calldata->arg.seq_args,
5662                                 &calldata->res.seq_res, 0, task))
5663                 return;
5664
5665         rpc_call_start(task);
5666 }
5667
5668 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5669 {
5670         switch(task->tk_status) {
5671         case 0:
5672         case -NFS4ERR_COMPLETE_ALREADY:
5673         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5674                 break;
5675         case -NFS4ERR_DELAY:
5676                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5677                 /* fall through */
5678         case -NFS4ERR_RETRY_UNCACHED_REP:
5679                 return -EAGAIN;
5680         default:
5681                 nfs4_schedule_lease_recovery(clp);
5682         }
5683         return 0;
5684 }
5685
5686 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5687 {
5688         struct nfs4_reclaim_complete_data *calldata = data;
5689         struct nfs_client *clp = calldata->clp;
5690         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5691
5692         dprintk("--> %s\n", __func__);
5693         if (!nfs41_sequence_done(task, res))
5694                 return;
5695
5696         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5697                 rpc_restart_call_prepare(task);
5698                 return;
5699         }
5700         dprintk("<-- %s\n", __func__);
5701 }
5702
5703 static void nfs4_free_reclaim_complete_data(void *data)
5704 {
5705         struct nfs4_reclaim_complete_data *calldata = data;
5706
5707         kfree(calldata);
5708 }
5709
5710 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5711         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5712         .rpc_call_done = nfs4_reclaim_complete_done,
5713         .rpc_release = nfs4_free_reclaim_complete_data,
5714 };
5715
5716 /*
5717  * Issue a global reclaim complete.
5718  */
5719 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5720 {
5721         struct nfs4_reclaim_complete_data *calldata;
5722         struct rpc_task *task;
5723         struct rpc_message msg = {
5724                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5725         };
5726         struct rpc_task_setup task_setup_data = {
5727                 .rpc_client = clp->cl_rpcclient,
5728                 .rpc_message = &msg,
5729                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5730                 .flags = RPC_TASK_ASYNC,
5731         };
5732         int status = -ENOMEM;
5733
5734         dprintk("--> %s\n", __func__);
5735         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5736         if (calldata == NULL)
5737                 goto out;
5738         calldata->clp = clp;
5739         calldata->arg.one_fs = 0;
5740
5741         msg.rpc_argp = &calldata->arg;
5742         msg.rpc_resp = &calldata->res;
5743         task_setup_data.callback_data = calldata;
5744         task = rpc_run_task(&task_setup_data);
5745         if (IS_ERR(task)) {
5746                 status = PTR_ERR(task);
5747                 goto out;
5748         }
5749         status = nfs4_wait_for_completion_rpc_task(task);
5750         if (status == 0)
5751                 status = task->tk_status;
5752         rpc_put_task(task);
5753         return 0;
5754 out:
5755         dprintk("<-- %s status=%d\n", __func__, status);
5756         return status;
5757 }
5758
5759 static void
5760 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5761 {
5762         struct nfs4_layoutget *lgp = calldata;
5763         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5764
5765         dprintk("--> %s\n", __func__);
5766         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5767          * right now covering the LAYOUTGET we are about to send.
5768          * However, that is not so catastrophic, and there seems
5769          * to be no way to prevent it completely.
5770          */
5771         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5772                                 &lgp->res.seq_res, 0, task))
5773                 return;
5774         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5775                                           NFS_I(lgp->args.inode)->layout,
5776                                           lgp->args.ctx->state)) {
5777                 rpc_exit(task, NFS4_OK);
5778                 return;
5779         }
5780         rpc_call_start(task);
5781 }
5782
5783 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5784 {
5785         struct nfs4_layoutget *lgp = calldata;
5786         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5787
5788         dprintk("--> %s\n", __func__);
5789
5790         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5791                 return;
5792
5793         switch (task->tk_status) {
5794         case 0:
5795                 break;
5796         case -NFS4ERR_LAYOUTTRYLATER:
5797         case -NFS4ERR_RECALLCONFLICT:
5798                 task->tk_status = -NFS4ERR_DELAY;
5799                 /* Fall through */
5800         default:
5801                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5802                         rpc_restart_call_prepare(task);
5803                         return;
5804                 }
5805         }
5806         dprintk("<-- %s\n", __func__);
5807 }
5808
5809 static size_t max_response_pages(struct nfs_server *server)
5810 {
5811         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
5812         return nfs_page_array_len(0, max_resp_sz);
5813 }
5814
5815 static void nfs4_free_pages(struct page **pages, size_t size)
5816 {
5817         int i;
5818
5819         if (!pages)
5820                 return;
5821
5822         for (i = 0; i < size; i++) {
5823                 if (!pages[i])
5824                         break;
5825                 __free_page(pages[i]);
5826         }
5827         kfree(pages);
5828 }
5829
5830 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
5831 {
5832         struct page **pages;
5833         int i;
5834
5835         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
5836         if (!pages) {
5837                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
5838                 return NULL;
5839         }
5840
5841         for (i = 0; i < size; i++) {
5842                 pages[i] = alloc_page(gfp_flags);
5843                 if (!pages[i]) {
5844                         dprintk("%s: failed to allocate page\n", __func__);
5845                         nfs4_free_pages(pages, size);
5846                         return NULL;
5847                 }
5848         }
5849
5850         return pages;
5851 }
5852
5853 static void nfs4_layoutget_release(void *calldata)
5854 {
5855         struct nfs4_layoutget *lgp = calldata;
5856         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5857         size_t max_pages = max_response_pages(server);
5858
5859         dprintk("--> %s\n", __func__);
5860         nfs4_free_pages(lgp->args.layout.pages, max_pages);
5861         put_nfs_open_context(lgp->args.ctx);
5862         kfree(calldata);
5863         dprintk("<-- %s\n", __func__);
5864 }
5865
5866 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5867         .rpc_call_prepare = nfs4_layoutget_prepare,
5868         .rpc_call_done = nfs4_layoutget_done,
5869         .rpc_release = nfs4_layoutget_release,
5870 };
5871
5872 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
5873 {
5874         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5875         size_t max_pages = max_response_pages(server);
5876         struct rpc_task *task;
5877         struct rpc_message msg = {
5878                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5879                 .rpc_argp = &lgp->args,
5880                 .rpc_resp = &lgp->res,
5881         };
5882         struct rpc_task_setup task_setup_data = {
5883                 .rpc_client = server->client,
5884                 .rpc_message = &msg,
5885                 .callback_ops = &nfs4_layoutget_call_ops,
5886                 .callback_data = lgp,
5887                 .flags = RPC_TASK_ASYNC,
5888         };
5889         int status = 0;
5890
5891         dprintk("--> %s\n", __func__);
5892
5893         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
5894         if (!lgp->args.layout.pages) {
5895                 nfs4_layoutget_release(lgp);
5896                 return -ENOMEM;
5897         }
5898         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
5899
5900         lgp->res.layoutp = &lgp->args.layout;
5901         lgp->res.seq_res.sr_slot = NULL;
5902         task = rpc_run_task(&task_setup_data);
5903         if (IS_ERR(task))
5904                 return PTR_ERR(task);
5905         status = nfs4_wait_for_completion_rpc_task(task);
5906         if (status == 0)
5907                 status = task->tk_status;
5908         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
5909         if (status == 0 && lgp->res.layoutp->len)
5910                 status = pnfs_layout_process(lgp);
5911         rpc_put_task(task);
5912         dprintk("<-- %s status=%d\n", __func__, status);
5913         return status;
5914 }
5915
5916 static void
5917 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5918 {
5919         struct nfs4_layoutreturn *lrp = calldata;
5920
5921         dprintk("--> %s\n", __func__);
5922         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5923                                 &lrp->res.seq_res, 0, task))
5924                 return;
5925         rpc_call_start(task);
5926 }
5927
5928 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5929 {
5930         struct nfs4_layoutreturn *lrp = calldata;
5931         struct nfs_server *server;
5932         struct pnfs_layout_hdr *lo = lrp->args.layout;
5933
5934         dprintk("--> %s\n", __func__);
5935
5936         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5937                 return;
5938
5939         server = NFS_SERVER(lrp->args.inode);
5940         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5941                 rpc_restart_call_prepare(task);
5942                 return;
5943         }
5944         spin_lock(&lo->plh_inode->i_lock);
5945         if (task->tk_status == 0) {
5946                 if (lrp->res.lrs_present) {
5947                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5948                 } else
5949                         BUG_ON(!list_empty(&lo->plh_segs));
5950         }
5951         lo->plh_block_lgets--;
5952         spin_unlock(&lo->plh_inode->i_lock);
5953         dprintk("<-- %s\n", __func__);
5954 }
5955
5956 static void nfs4_layoutreturn_release(void *calldata)
5957 {
5958         struct nfs4_layoutreturn *lrp = calldata;
5959
5960         dprintk("--> %s\n", __func__);
5961         put_layout_hdr(lrp->args.layout);
5962         kfree(calldata);
5963         dprintk("<-- %s\n", __func__);
5964 }
5965
5966 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5967         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5968         .rpc_call_done = nfs4_layoutreturn_done,
5969         .rpc_release = nfs4_layoutreturn_release,
5970 };
5971
5972 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5973 {
5974         struct rpc_task *task;
5975         struct rpc_message msg = {
5976                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5977                 .rpc_argp = &lrp->args,
5978                 .rpc_resp = &lrp->res,
5979         };
5980         struct rpc_task_setup task_setup_data = {
5981                 .rpc_client = lrp->clp->cl_rpcclient,
5982                 .rpc_message = &msg,
5983                 .callback_ops = &nfs4_layoutreturn_call_ops,
5984                 .callback_data = lrp,
5985         };
5986         int status;
5987
5988         dprintk("--> %s\n", __func__);
5989         task = rpc_run_task(&task_setup_data);
5990         if (IS_ERR(task))
5991                 return PTR_ERR(task);
5992         status = task->tk_status;
5993         dprintk("<-- %s status=%d\n", __func__, status);
5994         rpc_put_task(task);
5995         return status;
5996 }
5997
5998 /*
5999  * Retrieve the list of Data Server devices from the MDS.
6000  */
6001 static int _nfs4_getdevicelist(struct nfs_server *server,
6002                                     const struct nfs_fh *fh,
6003                                     struct pnfs_devicelist *devlist)
6004 {
6005         struct nfs4_getdevicelist_args args = {
6006                 .fh = fh,
6007                 .layoutclass = server->pnfs_curr_ld->id,
6008         };
6009         struct nfs4_getdevicelist_res res = {
6010                 .devlist = devlist,
6011         };
6012         struct rpc_message msg = {
6013                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6014                 .rpc_argp = &args,
6015                 .rpc_resp = &res,
6016         };
6017         int status;
6018
6019         dprintk("--> %s\n", __func__);
6020         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6021                                 &res.seq_res, 0);
6022         dprintk("<-- %s status=%d\n", __func__, status);
6023         return status;
6024 }
6025
6026 int nfs4_proc_getdevicelist(struct nfs_server *server,
6027                             const struct nfs_fh *fh,
6028                             struct pnfs_devicelist *devlist)
6029 {
6030         struct nfs4_exception exception = { };
6031         int err;
6032
6033         do {
6034                 err = nfs4_handle_exception(server,
6035                                 _nfs4_getdevicelist(server, fh, devlist),
6036                                 &exception);
6037         } while (exception.retry);
6038
6039         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6040                 err, devlist->num_devs);
6041
6042         return err;
6043 }
6044 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6045
6046 static int
6047 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6048 {
6049         struct nfs4_getdeviceinfo_args args = {
6050                 .pdev = pdev,
6051         };
6052         struct nfs4_getdeviceinfo_res res = {
6053                 .pdev = pdev,
6054         };
6055         struct rpc_message msg = {
6056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6057                 .rpc_argp = &args,
6058                 .rpc_resp = &res,
6059         };
6060         int status;
6061
6062         dprintk("--> %s\n", __func__);
6063         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6064         dprintk("<-- %s status=%d\n", __func__, status);
6065
6066         return status;
6067 }
6068
6069 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6070 {
6071         struct nfs4_exception exception = { };
6072         int err;
6073
6074         do {
6075                 err = nfs4_handle_exception(server,
6076                                         _nfs4_proc_getdeviceinfo(server, pdev),
6077                                         &exception);
6078         } while (exception.retry);
6079         return err;
6080 }
6081 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6082
6083 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6084 {
6085         struct nfs4_layoutcommit_data *data = calldata;
6086         struct nfs_server *server = NFS_SERVER(data->args.inode);
6087
6088         if (nfs4_setup_sequence(server, &data->args.seq_args,
6089                                 &data->res.seq_res, 1, task))
6090                 return;
6091         rpc_call_start(task);
6092 }
6093
6094 static void
6095 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6096 {
6097         struct nfs4_layoutcommit_data *data = calldata;
6098         struct nfs_server *server = NFS_SERVER(data->args.inode);
6099
6100         if (!nfs4_sequence_done(task, &data->res.seq_res))
6101                 return;
6102
6103         switch (task->tk_status) { /* Just ignore these failures */
6104         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6105         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6106         case -NFS4ERR_BADLAYOUT:     /* no layout */
6107         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6108                 task->tk_status = 0;
6109                 break;
6110         case 0:
6111                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6112                                                    data->res.fattr);
6113                 break;
6114         default:
6115                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6116                         rpc_restart_call_prepare(task);
6117                         return;
6118                 }
6119         }
6120 }
6121
6122 static void nfs4_layoutcommit_release(void *calldata)
6123 {
6124         struct nfs4_layoutcommit_data *data = calldata;
6125
6126         pnfs_cleanup_layoutcommit(data);
6127         put_rpccred(data->cred);
6128         kfree(data);
6129 }
6130
6131 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6132         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6133         .rpc_call_done = nfs4_layoutcommit_done,
6134         .rpc_release = nfs4_layoutcommit_release,
6135 };
6136
6137 int
6138 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6139 {
6140         struct rpc_message msg = {
6141                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6142                 .rpc_argp = &data->args,
6143                 .rpc_resp = &data->res,
6144                 .rpc_cred = data->cred,
6145         };
6146         struct rpc_task_setup task_setup_data = {
6147                 .task = &data->task,
6148                 .rpc_client = NFS_CLIENT(data->args.inode),
6149                 .rpc_message = &msg,
6150                 .callback_ops = &nfs4_layoutcommit_ops,
6151                 .callback_data = data,
6152                 .flags = RPC_TASK_ASYNC,
6153         };
6154         struct rpc_task *task;
6155         int status = 0;
6156
6157         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6158                 "lbw: %llu inode %lu\n",
6159                 data->task.tk_pid, sync,
6160                 data->args.lastbytewritten,
6161                 data->args.inode->i_ino);
6162
6163         task = rpc_run_task(&task_setup_data);
6164         if (IS_ERR(task))
6165                 return PTR_ERR(task);
6166         if (sync == false)
6167                 goto out;
6168         status = nfs4_wait_for_completion_rpc_task(task);
6169         if (status != 0)
6170                 goto out;
6171         status = task->tk_status;
6172 out:
6173         dprintk("%s: status %d\n", __func__, status);
6174         rpc_put_task(task);
6175         return status;
6176 }
6177
6178 static int
6179 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6180                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6181 {
6182         struct nfs41_secinfo_no_name_args args = {
6183                 .style = SECINFO_STYLE_CURRENT_FH,
6184         };
6185         struct nfs4_secinfo_res res = {
6186                 .flavors = flavors,
6187         };
6188         struct rpc_message msg = {
6189                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6190                 .rpc_argp = &args,
6191                 .rpc_resp = &res,
6192         };
6193         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6194 }
6195
6196 static int
6197 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6198                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6199 {
6200         struct nfs4_exception exception = { };
6201         int err;
6202         do {
6203                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6204                 switch (err) {
6205                 case 0:
6206                 case -NFS4ERR_WRONGSEC:
6207                 case -ENOTSUPP:
6208                         goto out;
6209                 default:
6210                         err = nfs4_handle_exception(server, err, &exception);
6211                 }
6212         } while (exception.retry);
6213 out:
6214         return err;
6215 }
6216
6217 static int
6218 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6219                     struct nfs_fsinfo *info)
6220 {
6221         int err;
6222         struct page *page;
6223         rpc_authflavor_t flavor;
6224         struct nfs4_secinfo_flavors *flavors;
6225
6226         page = alloc_page(GFP_KERNEL);
6227         if (!page) {
6228                 err = -ENOMEM;
6229                 goto out;
6230         }
6231
6232         flavors = page_address(page);
6233         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6234
6235         /*
6236          * Fall back on "guess and check" method if
6237          * the server doesn't support SECINFO_NO_NAME
6238          */
6239         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
6240                 err = nfs4_find_root_sec(server, fhandle, info);
6241                 goto out_freepage;
6242         }
6243         if (err)
6244                 goto out_freepage;
6245
6246         flavor = nfs_find_best_sec(flavors);
6247         if (err == 0)
6248                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6249
6250 out_freepage:
6251         put_page(page);
6252         if (err == -EACCES)
6253                 return -EPERM;
6254 out:
6255         return err;
6256 }
6257 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6258 {
6259         int status;
6260         struct nfs41_test_stateid_args args = {
6261                 .stateid = &state->stateid,
6262         };
6263         struct nfs41_test_stateid_res res;
6264         struct rpc_message msg = {
6265                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6266                 .rpc_argp = &args,
6267                 .rpc_resp = &res,
6268         };
6269         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6270         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6271         return status;
6272 }
6273
6274 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6275 {
6276         struct nfs4_exception exception = { };
6277         int err;
6278         do {
6279                 err = nfs4_handle_exception(server,
6280                                 _nfs41_test_stateid(server, state),
6281                                 &exception);
6282         } while (exception.retry);
6283         return err;
6284 }
6285
6286 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6287 {
6288         int status;
6289         struct nfs41_free_stateid_args args = {
6290                 .stateid = &state->stateid,
6291         };
6292         struct nfs41_free_stateid_res res;
6293         struct rpc_message msg = {
6294                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6295                 .rpc_argp = &args,
6296                 .rpc_resp = &res,
6297         };
6298
6299         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6300         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6301         return status;
6302 }
6303
6304 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6305 {
6306         struct nfs4_exception exception = { };
6307         int err;
6308         do {
6309                 err = nfs4_handle_exception(server,
6310                                 _nfs4_free_stateid(server, state),
6311                                 &exception);
6312         } while (exception.retry);
6313         return err;
6314 }
6315 #endif /* CONFIG_NFS_V4_1 */
6316
6317 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6318         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6319         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6320         .recover_open   = nfs4_open_reclaim,
6321         .recover_lock   = nfs4_lock_reclaim,
6322         .establish_clid = nfs4_init_clientid,
6323         .get_clid_cred  = nfs4_get_setclientid_cred,
6324 };
6325
6326 #if defined(CONFIG_NFS_V4_1)
6327 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6328         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6329         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6330         .recover_open   = nfs4_open_reclaim,
6331         .recover_lock   = nfs4_lock_reclaim,
6332         .establish_clid = nfs41_init_clientid,
6333         .get_clid_cred  = nfs4_get_exchange_id_cred,
6334         .reclaim_complete = nfs41_proc_reclaim_complete,
6335 };
6336 #endif /* CONFIG_NFS_V4_1 */
6337
6338 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6339         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6340         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6341         .recover_open   = nfs4_open_expired,
6342         .recover_lock   = nfs4_lock_expired,
6343         .establish_clid = nfs4_init_clientid,
6344         .get_clid_cred  = nfs4_get_setclientid_cred,
6345 };
6346
6347 #if defined(CONFIG_NFS_V4_1)
6348 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6349         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6350         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6351         .recover_open   = nfs41_open_expired,
6352         .recover_lock   = nfs41_lock_expired,
6353         .establish_clid = nfs41_init_clientid,
6354         .get_clid_cred  = nfs4_get_exchange_id_cred,
6355 };
6356 #endif /* CONFIG_NFS_V4_1 */
6357
6358 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6359         .sched_state_renewal = nfs4_proc_async_renew,
6360         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6361         .renew_lease = nfs4_proc_renew,
6362 };
6363
6364 #if defined(CONFIG_NFS_V4_1)
6365 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6366         .sched_state_renewal = nfs41_proc_async_sequence,
6367         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6368         .renew_lease = nfs4_proc_sequence,
6369 };
6370 #endif
6371
6372 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6373         .minor_version = 0,
6374         .call_sync = _nfs4_call_sync,
6375         .validate_stateid = nfs4_validate_delegation_stateid,
6376         .find_root_sec = nfs4_find_root_sec,
6377         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6378         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6379         .state_renewal_ops = &nfs40_state_renewal_ops,
6380 };
6381
6382 #if defined(CONFIG_NFS_V4_1)
6383 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6384         .minor_version = 1,
6385         .call_sync = _nfs4_call_sync_session,
6386         .validate_stateid = nfs41_validate_delegation_stateid,
6387         .find_root_sec = nfs41_find_root_sec,
6388         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6389         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6390         .state_renewal_ops = &nfs41_state_renewal_ops,
6391 };
6392 #endif
6393
6394 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6395         [0] = &nfs_v4_0_minor_ops,
6396 #if defined(CONFIG_NFS_V4_1)
6397         [1] = &nfs_v4_1_minor_ops,
6398 #endif
6399 };
6400
6401 static const struct inode_operations nfs4_file_inode_operations = {
6402         .permission     = nfs_permission,
6403         .getattr        = nfs_getattr,
6404         .setattr        = nfs_setattr,
6405         .getxattr       = generic_getxattr,
6406         .setxattr       = generic_setxattr,
6407         .listxattr      = generic_listxattr,
6408         .removexattr    = generic_removexattr,
6409 };
6410
6411 const struct nfs_rpc_ops nfs_v4_clientops = {
6412         .version        = 4,                    /* protocol version */
6413         .dentry_ops     = &nfs4_dentry_operations,
6414         .dir_inode_ops  = &nfs4_dir_inode_operations,
6415         .file_inode_ops = &nfs4_file_inode_operations,
6416         .file_ops       = &nfs4_file_operations,
6417         .getroot        = nfs4_proc_get_root,
6418         .getattr        = nfs4_proc_getattr,
6419         .setattr        = nfs4_proc_setattr,
6420         .lookup         = nfs4_proc_lookup,
6421         .access         = nfs4_proc_access,
6422         .readlink       = nfs4_proc_readlink,
6423         .create         = nfs4_proc_create,
6424         .remove         = nfs4_proc_remove,
6425         .unlink_setup   = nfs4_proc_unlink_setup,
6426         .unlink_done    = nfs4_proc_unlink_done,
6427         .rename         = nfs4_proc_rename,
6428         .rename_setup   = nfs4_proc_rename_setup,
6429         .rename_done    = nfs4_proc_rename_done,
6430         .link           = nfs4_proc_link,
6431         .symlink        = nfs4_proc_symlink,
6432         .mkdir          = nfs4_proc_mkdir,
6433         .rmdir          = nfs4_proc_remove,
6434         .readdir        = nfs4_proc_readdir,
6435         .mknod          = nfs4_proc_mknod,
6436         .statfs         = nfs4_proc_statfs,
6437         .fsinfo         = nfs4_proc_fsinfo,
6438         .pathconf       = nfs4_proc_pathconf,
6439         .set_capabilities = nfs4_server_capabilities,
6440         .decode_dirent  = nfs4_decode_dirent,
6441         .read_setup     = nfs4_proc_read_setup,
6442         .read_done      = nfs4_read_done,
6443         .write_setup    = nfs4_proc_write_setup,
6444         .write_done     = nfs4_write_done,
6445         .commit_setup   = nfs4_proc_commit_setup,
6446         .commit_done    = nfs4_commit_done,
6447         .lock           = nfs4_proc_lock,
6448         .clear_acl_cache = nfs4_zap_acl_attr,
6449         .close_context  = nfs4_close_context,
6450         .open_context   = nfs4_atomic_open,
6451         .init_client    = nfs4_init_client,
6452         .secinfo        = nfs4_proc_secinfo,
6453 };
6454
6455 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6456         .prefix = XATTR_NAME_NFSV4_ACL,
6457         .list   = nfs4_xattr_list_nfs4_acl,
6458         .get    = nfs4_xattr_get_nfs4_acl,
6459         .set    = nfs4_xattr_set_nfs4_acl,
6460 };
6461
6462 const struct xattr_handler *nfs4_xattr_handlers[] = {
6463         &nfs4_xattr_nfs4_acl_handler,
6464         NULL
6465 };
6466
6467 /*
6468  * Local variables:
6469  *  c-basic-offset: 8
6470  * End:
6471  */