fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57
  58 #include "nfs4_fs.h"
  59 #include "delegation.h"
  60 #include "internal.h"
  61 #include "iostat.h"
  62 #include "callback.h"
  63 #include "pnfs.h"
  64
  65 #define NFSDBG_FACILITY         NFSDBG_PROC
  66
  67 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  68 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  69
  70 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  71
  72 struct nfs4_opendata;
  73 static int _nfs4_proc_open(struct nfs4_opendata *data);
  74 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  75 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  76 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  77 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  78 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  79                             struct nfs_fattr *fattr, struct iattr *sattr,
  80                             struct nfs4_state *state);
  81 #ifdef CONFIG_NFS_V4_1
  82 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  83 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  84 #endif
  85 /* Prevent leaks of NFSv4 errors into userland */
  86 static int nfs4_map_errors(int err)
  87 {
  88         if (err >= -1000)
  89                 return err;
  90         switch (err) {
  91         case -NFS4ERR_RESOURCE:
  92                 return -EREMOTEIO;
  93         case -NFS4ERR_WRONGSEC:
  94                 return -EPERM;
  95         case -NFS4ERR_BADOWNER:
  96         case -NFS4ERR_BADNAME:
  97                 return -EINVAL;
  98         default:
  99                 dprintk("%s could not handle NFSv4 error %d\n",
 100                                 __func__, -err);
 101                 break;
 102         }
 103         return -EIO;
 104 }
 105
 106 /*
 107  * This is our standard bitmap for GETATTR requests.
 108  */
 109 const u32 nfs4_fattr_bitmap[2] = {
 110         FATTR4_WORD0_TYPE
 111         | FATTR4_WORD0_CHANGE
 112         | FATTR4_WORD0_SIZE
 113         | FATTR4_WORD0_FSID
 114         | FATTR4_WORD0_FILEID,
 115         FATTR4_WORD1_MODE
 116         | FATTR4_WORD1_NUMLINKS
 117         | FATTR4_WORD1_OWNER
 118         | FATTR4_WORD1_OWNER_GROUP
 119         | FATTR4_WORD1_RAWDEV
 120         | FATTR4_WORD1_SPACE_USED
 121         | FATTR4_WORD1_TIME_ACCESS
 122         | FATTR4_WORD1_TIME_METADATA
 123         | FATTR4_WORD1_TIME_MODIFY
 124 };
 125
 126 const u32 nfs4_statfs_bitmap[2] = {
 127         FATTR4_WORD0_FILES_AVAIL
 128         | FATTR4_WORD0_FILES_FREE
 129         | FATTR4_WORD0_FILES_TOTAL,
 130         FATTR4_WORD1_SPACE_AVAIL
 131         | FATTR4_WORD1_SPACE_FREE
 132         | FATTR4_WORD1_SPACE_TOTAL
 133 };
 134
 135 const u32 nfs4_pathconf_bitmap[2] = {
 136         FATTR4_WORD0_MAXLINK
 137         | FATTR4_WORD0_MAXNAME,
 138         0
 139 };
 140
 141 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 142                         | FATTR4_WORD0_MAXREAD
 143                         | FATTR4_WORD0_MAXWRITE
 144                         | FATTR4_WORD0_LEASE_TIME,
 145                         FATTR4_WORD1_TIME_DELTA
 146                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 147                         FATTR4_WORD2_LAYOUT_BLKSIZE
 148 };
 149
 150 const u32 nfs4_fs_locations_bitmap[2] = {
 151         FATTR4_WORD0_TYPE
 152         | FATTR4_WORD0_CHANGE
 153         | FATTR4_WORD0_SIZE
 154         | FATTR4_WORD0_FSID
 155         | FATTR4_WORD0_FILEID
 156         | FATTR4_WORD0_FS_LOCATIONS,
 157         FATTR4_WORD1_MODE
 158         | FATTR4_WORD1_NUMLINKS
 159         | FATTR4_WORD1_OWNER
 160         | FATTR4_WORD1_OWNER_GROUP
 161         | FATTR4_WORD1_RAWDEV
 162         | FATTR4_WORD1_SPACE_USED
 163         | FATTR4_WORD1_TIME_ACCESS
 164         | FATTR4_WORD1_TIME_METADATA
 165         | FATTR4_WORD1_TIME_MODIFY
 166         | FATTR4_WORD1_MOUNTED_ON_FILEID
 167 };
 168
 169 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 170                 struct nfs4_readdir_arg *readdir)
 171 {
 172         __be32 *start, *p;
 173
 174         BUG_ON(readdir->count < 80);
 175         if (cookie > 2) {
 176                 readdir->cookie = cookie;
 177                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 178                 return;
 179         }
 180
 181         readdir->cookie = 0;
 182         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 183         if (cookie == 2)
 184                 return;
 185
 186         /*
 187          * NFSv4 servers do not return entries for '.' and '..'
 188          * Therefore, we fake these entries here.  We let '.'
 189          * have cookie 0 and '..' have cookie 1.  Note that
 190          * when talking to the server, we always send cookie 0
 191          * instead of 1 or 2.
 192          */
 193         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 194
 195         if (cookie == 0) {
 196                 *p++ = xdr_one;                                  /* next */
 197                 *p++ = xdr_zero;                   /* cookie, first word */
 198                 *p++ = xdr_one;                   /* cookie, second word */
 199                 *p++ = xdr_one;                             /* entry len */
 200                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 201                 p++;
 202                 *p++ = xdr_one;                         /* bitmap length */
 203                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 204                 *p++ = htonl(8);              /* attribute buffer length */
 205                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 206         }
 207
 208         *p++ = xdr_one;                                  /* next */
 209         *p++ = xdr_zero;                   /* cookie, first word */
 210         *p++ = xdr_two;                   /* cookie, second word */
 211         *p++ = xdr_two;                             /* entry len */
 212         memcpy(p, "..\0\0", 4);                         /* entry */
 213         p++;
 214         *p++ = xdr_one;                         /* bitmap length */
 215         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 216         *p++ = htonl(8);              /* attribute buffer length */
 217         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 218
 219         readdir->pgbase = (char *)p - (char *)start;
 220         readdir->count -= readdir->pgbase;
 221         kunmap_atomic(start, KM_USER0);
 222 }
 223
 224 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 225 {
 226         int res;
 227
 228         might_sleep();
 229
 230         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 231                         nfs_wait_bit_killable, TASK_KILLABLE);
 232         return res;
 233 }
 234
 235 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 236 {
 237         int res = 0;
 238
 239         might_sleep();
 240
 241         if (*timeout <= 0)
 242                 *timeout = NFS4_POLL_RETRY_MIN;
 243         if (*timeout > NFS4_POLL_RETRY_MAX)
 244                 *timeout = NFS4_POLL_RETRY_MAX;
 245         freezable_schedule_timeout_killable(*timeout);
 246         if (fatal_signal_pending(current))
 247                 res = -ERESTARTSYS;
 248         *timeout <<= 1;
 249         return res;
 250 }
 251
 252 /* This is the error handling routine for processes that are allowed
 253  * to sleep.
 254  */
 255 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 256 {
 257         struct nfs_client *clp = server->nfs_client;
 258         struct nfs4_state *state = exception->state;
 259         int ret = errorcode;
 260
 261         exception->retry = 0;
 262         switch(errorcode) {
 263                 case 0:
 264                         return 0;
 265                 case -NFS4ERR_ADMIN_REVOKED:
 266                 case -NFS4ERR_BAD_STATEID:
 267                 case -NFS4ERR_OPENMODE:
 268                         if (state == NULL)
 269                                 break;
 270                         nfs4_schedule_stateid_recovery(server, state);
 271                         goto wait_on_recovery;
 272                 case -NFS4ERR_EXPIRED:
 273                         if (state != NULL)
 274                                 nfs4_schedule_stateid_recovery(server, state);
 275                 case -NFS4ERR_STALE_STATEID:
 276                 case -NFS4ERR_STALE_CLIENTID:
 277                         nfs4_schedule_lease_recovery(clp);
 278                         goto wait_on_recovery;
 279 #if defined(CONFIG_NFS_V4_1)
 280                 case -NFS4ERR_BADSESSION:
 281                 case -NFS4ERR_BADSLOT:
 282                 case -NFS4ERR_BAD_HIGH_SLOT:
 283                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 284                 case -NFS4ERR_DEADSESSION:
 285                 case -NFS4ERR_SEQ_FALSE_RETRY:
 286                 case -NFS4ERR_SEQ_MISORDERED:
 287                         dprintk("%s ERROR: %d Reset session\n", __func__,
 288                                 errorcode);
 289                         nfs4_schedule_session_recovery(clp->cl_session);
 290                         exception->retry = 1;
 291                         break;
 292 #endif /* defined(CONFIG_NFS_V4_1) */
 293                 case -NFS4ERR_FILE_OPEN:
 294                         if (exception->timeout > HZ) {
 295                                 /* We have retried a decent amount, time to
 296                                  * fail
 297                                  */
 298                                 ret = -EBUSY;
 299                                 break;
 300                         }
 301                 case -NFS4ERR_GRACE:
 302                 case -NFS4ERR_DELAY:
 303                 case -EKEYEXPIRED:
 304                         ret = nfs4_delay(server->client, &exception->timeout);
 305                         if (ret != 0)
 306                                 break;
 307                 case -NFS4ERR_RETRY_UNCACHED_REP:
 308                 case -NFS4ERR_OLD_STATEID:
 309                         exception->retry = 1;
 310                         break;
 311                 case -NFS4ERR_BADOWNER:
 312                         /* The following works around a Linux server bug! */
 313                 case -NFS4ERR_BADNAME:
 314                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 315                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 316                                 exception->retry = 1;
 317                                 printk(KERN_WARNING "NFS: v4 server %s "
 318                                                 "does not accept raw "
 319                                                 "uid/gids. "
 320                                                 "Reenabling the idmapper.\n",
 321                                                 server->nfs_client->cl_hostname);
 322                         }
 323         }
 324         /* We failed to handle the error */
 325         return nfs4_map_errors(ret);
 326 wait_on_recovery:
 327         ret = nfs4_wait_clnt_recover(clp);
 328         if (ret == 0)
 329                 exception->retry = 1;
 330         return ret;
 331 }
 332
 333
 334 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 335 {
 336         spin_lock(&clp->cl_lock);
 337         if (time_before(clp->cl_last_renewal,timestamp))
 338                 clp->cl_last_renewal = timestamp;
 339         spin_unlock(&clp->cl_lock);
 340 }
 341
 342 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 343 {
 344         do_renew_lease(server->nfs_client, timestamp);
 345 }
 346
 347 #if defined(CONFIG_NFS_V4_1)
 348
 349 /*
 350  * nfs4_free_slot - free a slot and efficiently update slot table.
 351  *
 352  * freeing a slot is trivially done by clearing its respective bit
 353  * in the bitmap.
 354  * If the freed slotid equals highest_used_slotid we want to update it
 355  * so that the server would be able to size down the slot table if needed,
 356  * otherwise we know that the highest_used_slotid is still in use.
 357  * When updating highest_used_slotid there may be "holes" in the bitmap
 358  * so we need to scan down from highest_used_slotid to 0 looking for the now
 359  * highest slotid in use.
 360  * If none found, highest_used_slotid is set to -1.
 361  *
 362  * Must be called while holding tbl->slot_tbl_lock
 363  */
 364 static void
 365 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 366 {
 367         int free_slotid = free_slot - tbl->slots;
 368         int slotid = free_slotid;
 369
 370         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 371         /* clear used bit in bitmap */
 372         __clear_bit(slotid, tbl->used_slots);
 373
 374         /* update highest_used_slotid when it is freed */
 375         if (slotid == tbl->highest_used_slotid) {
 376                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 377                 if (slotid < tbl->max_slots)
 378                         tbl->highest_used_slotid = slotid;
 379                 else
 380                         tbl->highest_used_slotid = -1;
 381         }
 382         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 383                 free_slotid, tbl->highest_used_slotid);
 384 }
 385
 386 /*
 387  * Signal state manager thread if session fore channel is drained
 388  */
 389 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 390 {
 391         struct rpc_task *task;
 392
 393         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 394                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 395                 if (task)
 396                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 397                 return;
 398         }
 399
 400         if (ses->fc_slot_table.highest_used_slotid != -1)
 401                 return;
 402
 403         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 404         complete(&ses->fc_slot_table.complete);
 405 }
 406
 407 /*
 408  * Signal state manager thread if session back channel is drained
 409  */
 410 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 411 {
 412         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 413             ses->bc_slot_table.highest_used_slotid != -1)
 414                 return;
 415         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 416         complete(&ses->bc_slot_table.complete);
 417 }
 418
 419 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 420 {
 421         struct nfs4_slot_table *tbl;
 422
 423         tbl = &res->sr_session->fc_slot_table;
 424         if (!res->sr_slot) {
 425                 /* just wake up the next guy waiting since
 426                  * we may have not consumed a slot after all */
 427                 dprintk("%s: No slot\n", __func__);
 428                 return;
 429         }
 430
 431         spin_lock(&tbl->slot_tbl_lock);
 432         nfs4_free_slot(tbl, res->sr_slot);
 433         nfs4_check_drain_fc_complete(res->sr_session);
 434         spin_unlock(&tbl->slot_tbl_lock);
 435         res->sr_slot = NULL;
 436 }
 437
 438 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 439 {
 440         unsigned long timestamp;
 441         struct nfs_client *clp;
 442
 443         /*
 444          * sr_status remains 1 if an RPC level error occurred. The server
 445          * may or may not have processed the sequence operation..
 446          * Proceed as if the server received and processed the sequence
 447          * operation.
 448          */
 449         if (res->sr_status == 1)
 450                 res->sr_status = NFS_OK;
 451
 452         /* don't increment the sequence number if the task wasn't sent */
 453         if (!RPC_WAS_SENT(task))
 454                 goto out;
 455
 456         /* Check the SEQUENCE operation status */
 457         switch (res->sr_status) {
 458         case 0:
 459                 /* Update the slot's sequence and clientid lease timer */
 460                 ++res->sr_slot->seq_nr;
 461                 timestamp = res->sr_renewal_time;
 462                 clp = res->sr_session->clp;
 463                 do_renew_lease(clp, timestamp);
 464                 /* Check sequence flags */
 465                 if (res->sr_status_flags != 0)
 466                         nfs4_schedule_lease_recovery(clp);
 467                 break;
 468         case -NFS4ERR_DELAY:
 469                 /* The server detected a resend of the RPC call and
 470                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 471                  * of RFC5661.
 472                  */
 473                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 474                         __func__,
 475                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 476                         res->sr_slot->seq_nr);
 477                 goto out_retry;
 478         default:
 479                 /* Just update the slot sequence no. */
 480                 ++res->sr_slot->seq_nr;
 481         }
 482 out:
 483         /* The session may be reset by one of the error handlers. */
 484         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 485         nfs41_sequence_free_slot(res);
 486         return 1;
 487 out_retry:
 488         if (!rpc_restart_call(task))
 489                 goto out;
 490         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 491         return 0;
 492 }
 493
 494 static int nfs4_sequence_done(struct rpc_task *task,
 495                                struct nfs4_sequence_res *res)
 496 {
 497         if (res->sr_session == NULL)
 498                 return 1;
 499         return nfs41_sequence_done(task, res);
 500 }
 501
 502 /*
 503  * nfs4_find_slot - efficiently look for a free slot
 504  *
 505  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 506  * If found, we mark the slot as used, update the highest_used_slotid,
 507  * and respectively set up the sequence operation args.
 508  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 509  *
 510  * Note: must be called with under the slot_tbl_lock.
 511  */
 512 static u8
 513 nfs4_find_slot(struct nfs4_slot_table *tbl)
 514 {
 515         int slotid;
 516         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 517         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 518
 519         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 520                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 521                 tbl->max_slots);
 522         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 523         if (slotid >= tbl->max_slots)
 524                 goto out;
 525         __set_bit(slotid, tbl->used_slots);
 526         if (slotid > tbl->highest_used_slotid)
 527                 tbl->highest_used_slotid = slotid;
 528         ret_id = slotid;
 529 out:
 530         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 531                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 532         return ret_id;
 533 }
 534
 535 int nfs41_setup_sequence(struct nfs4_session *session,
 536                                 struct nfs4_sequence_args *args,
 537                                 struct nfs4_sequence_res *res,
 538                                 int cache_reply,
 539                                 struct rpc_task *task)
 540 {
 541         struct nfs4_slot *slot;
 542         struct nfs4_slot_table *tbl;
 543         u8 slotid;
 544
 545         dprintk("--> %s\n", __func__);
 546         /* slot already allocated? */
 547         if (res->sr_slot != NULL)
 548                 return 0;
 549
 550         tbl = &session->fc_slot_table;
 551
 552         spin_lock(&tbl->slot_tbl_lock);
 553         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 554             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 555                 /*
 556                  * The state manager will wait until the slot table is empty.
 557                  * Schedule the reset thread
 558                  */
 559                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 560                 spin_unlock(&tbl->slot_tbl_lock);
 561                 dprintk("%s Schedule Session Reset\n", __func__);
 562                 return -EAGAIN;
 563         }
 564
 565         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 566             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 567                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 568                 spin_unlock(&tbl->slot_tbl_lock);
 569                 dprintk("%s enforce FIFO order\n", __func__);
 570                 return -EAGAIN;
 571         }
 572
 573         slotid = nfs4_find_slot(tbl);
 574         if (slotid == NFS4_MAX_SLOT_TABLE) {
 575                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 576                 spin_unlock(&tbl->slot_tbl_lock);
 577                 dprintk("<-- %s: no free slots\n", __func__);
 578                 return -EAGAIN;
 579         }
 580         spin_unlock(&tbl->slot_tbl_lock);
 581
 582         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 583         slot = tbl->slots + slotid;
 584         args->sa_session = session;
 585         args->sa_slotid = slotid;
 586         args->sa_cache_this = cache_reply;
 587
 588         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 589
 590         res->sr_session = session;
 591         res->sr_slot = slot;
 592         res->sr_renewal_time = jiffies;
 593         res->sr_status_flags = 0;
 594         /*
 595          * sr_status is only set in decode_sequence, and so will remain
 596          * set to 1 if an rpc level failure occurs.
 597          */
 598         res->sr_status = 1;
 599         return 0;
 600 }
 601 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 602
 603 int nfs4_setup_sequence(const struct nfs_server *server,
 604                         struct nfs4_sequence_args *args,
 605                         struct nfs4_sequence_res *res,
 606                         int cache_reply,
 607                         struct rpc_task *task)
 608 {
 609         struct nfs4_session *session = nfs4_get_session(server);
 610         int ret = 0;
 611
 612         if (session == NULL) {
 613                 args->sa_session = NULL;
 614                 res->sr_session = NULL;
 615                 goto out;
 616         }
 617
 618         dprintk("--> %s clp %p session %p sr_slot %td\n",
 619                 __func__, session->clp, session, res->sr_slot ?
 620                         res->sr_slot - session->fc_slot_table.slots : -1);
 621
 622         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 623                                    task);
 624 out:
 625         dprintk("<-- %s status=%d\n", __func__, ret);
 626         return ret;
 627 }
 628
 629 struct nfs41_call_sync_data {
 630         const struct nfs_server *seq_server;
 631         struct nfs4_sequence_args *seq_args;
 632         struct nfs4_sequence_res *seq_res;
 633         int cache_reply;
 634 };
 635
 636 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 637 {
 638         struct nfs41_call_sync_data *data = calldata;
 639
 640         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 641
 642         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 643                                 data->seq_res, data->cache_reply, task))
 644                 return;
 645         rpc_call_start(task);
 646 }
 647
 648 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 649 {
 650         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 651         nfs41_call_sync_prepare(task, calldata);
 652 }
 653
 654 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 655 {
 656         struct nfs41_call_sync_data *data = calldata;
 657
 658         nfs41_sequence_done(task, data->seq_res);
 659 }
 660
 661 struct rpc_call_ops nfs41_call_sync_ops = {
 662         .rpc_call_prepare = nfs41_call_sync_prepare,
 663         .rpc_call_done = nfs41_call_sync_done,
 664 };
 665
 666 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 667         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 668         .rpc_call_done = nfs41_call_sync_done,
 669 };
 670
 671 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 672                                    struct nfs_server *server,
 673                                    struct rpc_message *msg,
 674                                    struct nfs4_sequence_args *args,
 675                                    struct nfs4_sequence_res *res,
 676                                    int cache_reply,
 677                                    int privileged)
 678 {
 679         int ret;
 680         struct rpc_task *task;
 681         struct nfs41_call_sync_data data = {
 682                 .seq_server = server,
 683                 .seq_args = args,
 684                 .seq_res = res,
 685                 .cache_reply = cache_reply,
 686         };
 687         struct rpc_task_setup task_setup = {
 688                 .rpc_client = clnt,
 689                 .rpc_message = msg,
 690                 .callback_ops = &nfs41_call_sync_ops,
 691                 .callback_data = &data
 692         };
 693
 694         res->sr_slot = NULL;
 695         if (privileged)
 696                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 697         task = rpc_run_task(&task_setup);
 698         if (IS_ERR(task))
 699                 ret = PTR_ERR(task);
 700         else {
 701                 ret = task->tk_status;
 702                 rpc_put_task(task);
 703         }
 704         return ret;
 705 }
 706
 707 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 708                             struct nfs_server *server,
 709                             struct rpc_message *msg,
 710                             struct nfs4_sequence_args *args,
 711                             struct nfs4_sequence_res *res,
 712                             int cache_reply)
 713 {
 714         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 715 }
 716
 717 #else
 718 static int nfs4_sequence_done(struct rpc_task *task,
 719                                struct nfs4_sequence_res *res)
 720 {
 721         return 1;
 722 }
 723 #endif /* CONFIG_NFS_V4_1 */
 724
 725 int _nfs4_call_sync(struct rpc_clnt *clnt,
 726                     struct nfs_server *server,
 727                     struct rpc_message *msg,
 728                     struct nfs4_sequence_args *args,
 729                     struct nfs4_sequence_res *res,
 730                     int cache_reply)
 731 {
 732         args->sa_session = res->sr_session = NULL;
 733         return rpc_call_sync(clnt, msg, 0);
 734 }
 735
 736 static inline
 737 int nfs4_call_sync(struct rpc_clnt *clnt,
 738                    struct nfs_server *server,
 739                    struct rpc_message *msg,
 740                    struct nfs4_sequence_args *args,
 741                    struct nfs4_sequence_res *res,
 742                    int cache_reply)
 743 {
 744         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 745                                                 args, res, cache_reply);
 746 }
 747
 748 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 749 {
 750         struct nfs_inode *nfsi = NFS_I(dir);
 751
 752         spin_lock(&dir->i_lock);
 753         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 754         if (!cinfo->atomic || cinfo->before != dir->i_version)
 755                 nfs_force_lookup_revalidate(dir);
 756         dir->i_version = cinfo->after;
 757         spin_unlock(&dir->i_lock);
 758 }
 759
 760 struct nfs4_opendata {
 761         struct kref kref;
 762         struct nfs_openargs o_arg;
 763         struct nfs_openres o_res;
 764         struct nfs_open_confirmargs c_arg;
 765         struct nfs_open_confirmres c_res;
 766         struct nfs_fattr f_attr;
 767         struct nfs_fattr dir_attr;
 768         struct dentry *dir;
 769         struct dentry *dentry;
 770         struct nfs4_state_owner *owner;
 771         struct nfs4_state *state;
 772         struct iattr attrs;
 773         unsigned long timestamp;
 774         unsigned int rpc_done : 1;
 775         int rpc_status;
 776         int cancelled;
 777 };
 778
 779
 780 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 781 {
 782         p->o_res.f_attr = &p->f_attr;
 783         p->o_res.dir_attr = &p->dir_attr;
 784         p->o_res.seqid = p->o_arg.seqid;
 785         p->c_res.seqid = p->c_arg.seqid;
 786         p->o_res.server = p->o_arg.server;
 787         nfs_fattr_init(&p->f_attr);
 788         nfs_fattr_init(&p->dir_attr);
 789 }
 790
 791 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 792                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 793                 const struct iattr *attrs,
 794                 gfp_t gfp_mask)
 795 {
 796         struct dentry *parent = dget_parent(dentry);
 797         struct inode *dir = parent->d_inode;
 798         struct nfs_server *server = NFS_SERVER(dir);
 799         struct nfs4_opendata *p;
 800
 801         p = kzalloc(sizeof(*p), gfp_mask);
 802         if (p == NULL)
 803                 goto err;
 804         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 805         if (p->o_arg.seqid == NULL)
 806                 goto err_free;
 807         nfs_sb_active(dentry->d_sb);
 808         p->dentry = dget(dentry);
 809         p->dir = parent;
 810         p->owner = sp;
 811         atomic_inc(&sp->so_count);
 812         p->o_arg.fh = NFS_FH(dir);
 813         p->o_arg.open_flags = flags;
 814         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 815         p->o_arg.clientid = server->nfs_client->cl_clientid;
 816         p->o_arg.id = sp->so_owner_id.id;
 817         p->o_arg.name = &dentry->d_name;
 818         p->o_arg.server = server;
 819         p->o_arg.bitmask = server->attr_bitmask;
 820         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 821         if (flags & O_CREAT) {
 822                 u32 *s;
 823
 824                 p->o_arg.u.attrs = &p->attrs;
 825                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 826                 s = (u32 *) p->o_arg.u.verifier.data;
 827                 s[0] = jiffies;
 828                 s[1] = current->pid;
 829         }
 830         p->c_arg.fh = &p->o_res.fh;
 831         p->c_arg.stateid = &p->o_res.stateid;
 832         p->c_arg.seqid = p->o_arg.seqid;
 833         nfs4_init_opendata_res(p);
 834         kref_init(&p->kref);
 835         return p;
 836 err_free:
 837         kfree(p);
 838 err:
 839         dput(parent);
 840         return NULL;
 841 }
 842
 843 static void nfs4_opendata_free(struct kref *kref)
 844 {
 845         struct nfs4_opendata *p = container_of(kref,
 846                         struct nfs4_opendata, kref);
 847         struct super_block *sb = p->dentry->d_sb;
 848
 849         nfs_free_seqid(p->o_arg.seqid);
 850         if (p->state != NULL)
 851                 nfs4_put_open_state(p->state);
 852         nfs4_put_state_owner(p->owner);
 853         dput(p->dir);
 854         dput(p->dentry);
 855         nfs_sb_deactive(sb);
 856         kfree(p);
 857 }
 858
 859 static void nfs4_opendata_put(struct nfs4_opendata *p)
 860 {
 861         if (p != NULL)
 862                 kref_put(&p->kref, nfs4_opendata_free);
 863 }
 864
 865 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 866 {
 867         int ret;
 868
 869         ret = rpc_wait_for_completion_task(task);
 870         return ret;
 871 }
 872
 873 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 874 {
 875         int ret = 0;
 876
 877         if (open_mode & O_EXCL)
 878                 goto out;
 879         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 880                 case FMODE_READ:
 881                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 882                                 && state->n_rdonly != 0;
 883                         break;
 884                 case FMODE_WRITE:
 885                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 886                                 && state->n_wronly != 0;
 887                         break;
 888                 case FMODE_READ|FMODE_WRITE:
 889                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 890                                 && state->n_rdwr != 0;
 891         }
 892 out:
 893         return ret;
 894 }
 895
 896 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 897 {
 898         if ((delegation->type & fmode) != fmode)
 899                 return 0;
 900         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 901                 return 0;
 902         nfs_mark_delegation_referenced(delegation);
 903         return 1;
 904 }
 905
 906 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 907 {
 908         switch (fmode) {
 909                 case FMODE_WRITE:
 910                         state->n_wronly++;
 911                         break;
 912                 case FMODE_READ:
 913                         state->n_rdonly++;
 914                         break;
 915                 case FMODE_READ|FMODE_WRITE:
 916                         state->n_rdwr++;
 917         }
 918         nfs4_state_set_mode_locked(state, state->state | fmode);
 919 }
 920
 921 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 922 {
 923         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 924                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 925         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 926         switch (fmode) {
 927                 case FMODE_READ:
 928                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 929                         break;
 930                 case FMODE_WRITE:
 931                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 932                         break;
 933                 case FMODE_READ|FMODE_WRITE:
 934                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 935         }
 936 }
 937
 938 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 939 {
 940         write_seqlock(&state->seqlock);
 941         nfs_set_open_stateid_locked(state, stateid, fmode);
 942         write_sequnlock(&state->seqlock);
 943 }
 944
 945 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 946 {
 947         /*
 948          * Protect the call to nfs4_state_set_mode_locked and
 949          * serialise the stateid update
 950          */
 951         write_seqlock(&state->seqlock);
 952         if (deleg_stateid != NULL) {
 953                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 954                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 955         }
 956         if (open_stateid != NULL)
 957                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 958         write_sequnlock(&state->seqlock);
 959         spin_lock(&state->owner->so_lock);
 960         update_open_stateflags(state, fmode);
 961         spin_unlock(&state->owner->so_lock);
 962 }
 963
 964 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 965 {
 966         struct nfs_inode *nfsi = NFS_I(state->inode);
 967         struct nfs_delegation *deleg_cur;
 968         int ret = 0;
 969
 970         fmode &= (FMODE_READ|FMODE_WRITE);
 971
 972         rcu_read_lock();
 973         deleg_cur = rcu_dereference(nfsi->delegation);
 974         if (deleg_cur == NULL)
 975                 goto no_delegation;
 976
 977         spin_lock(&deleg_cur->lock);
 978         if (nfsi->delegation != deleg_cur ||
 979             (deleg_cur->type & fmode) != fmode)
 980                 goto no_delegation_unlock;
 981
 982         if (delegation == NULL)
 983                 delegation = &deleg_cur->stateid;
 984         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 985                 goto no_delegation_unlock;
 986
 987         nfs_mark_delegation_referenced(deleg_cur);
 988         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 989         ret = 1;
 990 no_delegation_unlock:
 991         spin_unlock(&deleg_cur->lock);
 992 no_delegation:
 993         rcu_read_unlock();
 994
 995         if (!ret && open_stateid != NULL) {
 996                 __update_open_stateid(state, open_stateid, NULL, fmode);
 997                 ret = 1;
 998         }
 999
1000         return ret;
1001 }
1002
1003
1004 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1005 {
1006         struct nfs_delegation *delegation;
1007
1008         rcu_read_lock();
1009         delegation = rcu_dereference(NFS_I(inode)->delegation);
1010         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1011                 rcu_read_unlock();
1012                 return;
1013         }
1014         rcu_read_unlock();
1015         nfs_inode_return_delegation(inode);
1016 }
1017
1018 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1019 {
1020         struct nfs4_state *state = opendata->state;
1021         struct nfs_inode *nfsi = NFS_I(state->inode);
1022         struct nfs_delegation *delegation;
1023         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1024         fmode_t fmode = opendata->o_arg.fmode;
1025         nfs4_stateid stateid;
1026         int ret = -EAGAIN;
1027
1028         for (;;) {
1029                 if (can_open_cached(state, fmode, open_mode)) {
1030                         spin_lock(&state->owner->so_lock);
1031                         if (can_open_cached(state, fmode, open_mode)) {
1032                                 update_open_stateflags(state, fmode);
1033                                 spin_unlock(&state->owner->so_lock);
1034                                 goto out_return_state;
1035                         }
1036                         spin_unlock(&state->owner->so_lock);
1037                 }
1038                 rcu_read_lock();
1039                 delegation = rcu_dereference(nfsi->delegation);
1040                 if (delegation == NULL ||
1041                     !can_open_delegated(delegation, fmode)) {
1042                         rcu_read_unlock();
1043                         break;
1044                 }
1045                 /* Save the delegation */
1046                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1047                 rcu_read_unlock();
1048                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1049                 if (ret != 0)
1050                         goto out;
1051                 ret = -EAGAIN;
1052
1053                 /* Try to update the stateid using the delegation */
1054                 if (update_open_stateid(state, NULL, &stateid, fmode))
1055                         goto out_return_state;
1056         }
1057 out:
1058         return ERR_PTR(ret);
1059 out_return_state:
1060         atomic_inc(&state->count);
1061         return state;
1062 }
1063
1064 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1065 {
1066         struct inode *inode;
1067         struct nfs4_state *state = NULL;
1068         struct nfs_delegation *delegation;
1069         int ret;
1070
1071         if (!data->rpc_done) {
1072                 state = nfs4_try_open_cached(data);
1073                 goto out;
1074         }
1075
1076         ret = -EAGAIN;
1077         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1078                 goto err;
1079         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1080         ret = PTR_ERR(inode);
1081         if (IS_ERR(inode))
1082                 goto err;
1083         ret = -ENOMEM;
1084         state = nfs4_get_open_state(inode, data->owner);
1085         if (state == NULL)
1086                 goto err_put_inode;
1087         if (data->o_res.delegation_type != 0) {
1088                 int delegation_flags = 0;
1089
1090                 rcu_read_lock();
1091                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1092                 if (delegation)
1093                         delegation_flags = delegation->flags;
1094                 rcu_read_unlock();
1095                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1096                         nfs_inode_set_delegation(state->inode,
1097                                         data->owner->so_cred,
1098                                         &data->o_res);
1099                 else
1100                         nfs_inode_reclaim_delegation(state->inode,
1101                                         data->owner->so_cred,
1102                                         &data->o_res);
1103         }
1104
1105         update_open_stateid(state, &data->o_res.stateid, NULL,
1106                         data->o_arg.fmode);
1107         iput(inode);
1108 out:
1109         return state;
1110 err_put_inode:
1111         iput(inode);
1112 err:
1113         return ERR_PTR(ret);
1114 }
1115
1116 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1117 {
1118         struct nfs_inode *nfsi = NFS_I(state->inode);
1119         struct nfs_open_context *ctx;
1120
1121         spin_lock(&state->inode->i_lock);
1122         list_for_each_entry(ctx, &nfsi->open_files, list) {
1123                 if (ctx->state != state)
1124                         continue;
1125                 get_nfs_open_context(ctx);
1126                 spin_unlock(&state->inode->i_lock);
1127                 return ctx;
1128         }
1129         spin_unlock(&state->inode->i_lock);
1130         return ERR_PTR(-ENOENT);
1131 }
1132
1133 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1134 {
1135         struct nfs4_opendata *opendata;
1136
1137         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1138         if (opendata == NULL)
1139                 return ERR_PTR(-ENOMEM);
1140         opendata->state = state;
1141         atomic_inc(&state->count);
1142         return opendata;
1143 }
1144
1145 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1146 {
1147         struct nfs4_state *newstate;
1148         int ret;
1149
1150         opendata->o_arg.open_flags = 0;
1151         opendata->o_arg.fmode = fmode;
1152         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1153         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1154         nfs4_init_opendata_res(opendata);
1155         ret = _nfs4_recover_proc_open(opendata);
1156         if (ret != 0)
1157                 return ret;
1158         newstate = nfs4_opendata_to_nfs4_state(opendata);
1159         if (IS_ERR(newstate))
1160                 return PTR_ERR(newstate);
1161         nfs4_close_state(newstate, fmode);
1162         *res = newstate;
1163         return 0;
1164 }
1165
1166 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1167 {
1168         struct nfs4_state *newstate;
1169         int ret;
1170
1171         /* memory barrier prior to reading state->n_* */
1172         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1173         smp_rmb();
1174         if (state->n_rdwr != 0) {
1175                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1176                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1177                 if (ret != 0)
1178                         return ret;
1179                 if (newstate != state)
1180                         return -ESTALE;
1181         }
1182         if (state->n_wronly != 0) {
1183                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1184                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1185                 if (ret != 0)
1186                         return ret;
1187                 if (newstate != state)
1188                         return -ESTALE;
1189         }
1190         if (state->n_rdonly != 0) {
1191                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1192                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1193                 if (ret != 0)
1194                         return ret;
1195                 if (newstate != state)
1196                         return -ESTALE;
1197         }
1198         /*
1199          * We may have performed cached opens for all three recoveries.
1200          * Check if we need to update the current stateid.
1201          */
1202         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1203             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1204                 write_seqlock(&state->seqlock);
1205                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1206                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1207                 write_sequnlock(&state->seqlock);
1208         }
1209         return 0;
1210 }
1211
1212 /*
1213  * OPEN_RECLAIM:
1214  *      reclaim state on the server after a reboot.
1215  */
1216 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1217 {
1218         struct nfs_delegation *delegation;
1219         struct nfs4_opendata *opendata;
1220         fmode_t delegation_type = 0;
1221         int status;
1222
1223         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1224         if (IS_ERR(opendata))
1225                 return PTR_ERR(opendata);
1226         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1227         opendata->o_arg.fh = NFS_FH(state->inode);
1228         rcu_read_lock();
1229         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1230         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1231                 delegation_type = delegation->type;
1232         rcu_read_unlock();
1233         opendata->o_arg.u.delegation_type = delegation_type;
1234         status = nfs4_open_recover(opendata, state);
1235         nfs4_opendata_put(opendata);
1236         return status;
1237 }
1238
1239 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1240 {
1241         struct nfs_server *server = NFS_SERVER(state->inode);
1242         struct nfs4_exception exception = { };
1243         int err;
1244         do {
1245                 err = _nfs4_do_open_reclaim(ctx, state);
1246                 if (err != -NFS4ERR_DELAY)
1247                         break;
1248                 nfs4_handle_exception(server, err, &exception);
1249         } while (exception.retry);
1250         return err;
1251 }
1252
1253 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1254 {
1255         struct nfs_open_context *ctx;
1256         int ret;
1257
1258         ctx = nfs4_state_find_open_context(state);
1259         if (IS_ERR(ctx))
1260                 return PTR_ERR(ctx);
1261         ret = nfs4_do_open_reclaim(ctx, state);
1262         put_nfs_open_context(ctx);
1263         return ret;
1264 }
1265
1266 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1267 {
1268         struct nfs4_opendata *opendata;
1269         int ret;
1270
1271         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1272         if (IS_ERR(opendata))
1273                 return PTR_ERR(opendata);
1274         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1275         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1276                         sizeof(opendata->o_arg.u.delegation.data));
1277         ret = nfs4_open_recover(opendata, state);
1278         nfs4_opendata_put(opendata);
1279         return ret;
1280 }
1281
1282 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1283 {
1284         struct nfs4_exception exception = { };
1285         struct nfs_server *server = NFS_SERVER(state->inode);
1286         int err;
1287         do {
1288                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1289                 switch (err) {
1290                         case 0:
1291                         case -ENOENT:
1292                         case -ESTALE:
1293                                 goto out;
1294                         case -NFS4ERR_BADSESSION:
1295                         case -NFS4ERR_BADSLOT:
1296                         case -NFS4ERR_BAD_HIGH_SLOT:
1297                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1298                         case -NFS4ERR_DEADSESSION:
1299                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1300                                 goto out;
1301                         case -NFS4ERR_STALE_CLIENTID:
1302                         case -NFS4ERR_STALE_STATEID:
1303                         case -NFS4ERR_EXPIRED:
1304                                 /* Don't recall a delegation if it was lost */
1305                                 nfs4_schedule_lease_recovery(server->nfs_client);
1306                                 goto out;
1307                         case -ERESTARTSYS:
1308                                 /*
1309                                  * The show must go on: exit, but mark the
1310                                  * stateid as needing recovery.
1311                                  */
1312                         case -NFS4ERR_ADMIN_REVOKED:
1313                         case -NFS4ERR_BAD_STATEID:
1314                                 nfs4_schedule_stateid_recovery(server, state);
1315                         case -EKEYEXPIRED:
1316                                 /*
1317                                  * User RPCSEC_GSS context has expired.
1318                                  * We cannot recover this stateid now, so
1319                                  * skip it and allow recovery thread to
1320                                  * proceed.
1321                                  */
1322                         case -ENOMEM:
1323                                 err = 0;
1324                                 goto out;
1325                 }
1326                 err = nfs4_handle_exception(server, err, &exception);
1327         } while (exception.retry);
1328 out:
1329         return err;
1330 }
1331
1332 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1333 {
1334         struct nfs4_opendata *data = calldata;
1335
1336         data->rpc_status = task->tk_status;
1337         if (data->rpc_status == 0) {
1338                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1339                                 sizeof(data->o_res.stateid.data));
1340                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1341                 renew_lease(data->o_res.server, data->timestamp);
1342                 data->rpc_done = 1;
1343         }
1344 }
1345
1346 static void nfs4_open_confirm_release(void *calldata)
1347 {
1348         struct nfs4_opendata *data = calldata;
1349         struct nfs4_state *state = NULL;
1350
1351         /* If this request hasn't been cancelled, do nothing */
1352         if (data->cancelled == 0)
1353                 goto out_free;
1354         /* In case of error, no cleanup! */
1355         if (!data->rpc_done)
1356                 goto out_free;
1357         state = nfs4_opendata_to_nfs4_state(data);
1358         if (!IS_ERR(state))
1359                 nfs4_close_state(state, data->o_arg.fmode);
1360 out_free:
1361         nfs4_opendata_put(data);
1362 }
1363
1364 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1365         .rpc_call_done = nfs4_open_confirm_done,
1366         .rpc_release = nfs4_open_confirm_release,
1367 };
1368
1369 /*
1370  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1371  */
1372 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1373 {
1374         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1375         struct rpc_task *task;
1376         struct  rpc_message msg = {
1377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1378                 .rpc_argp = &data->c_arg,
1379                 .rpc_resp = &data->c_res,
1380                 .rpc_cred = data->owner->so_cred,
1381         };
1382         struct rpc_task_setup task_setup_data = {
1383                 .rpc_client = server->client,
1384                 .rpc_message = &msg,
1385                 .callback_ops = &nfs4_open_confirm_ops,
1386                 .callback_data = data,
1387                 .workqueue = nfsiod_workqueue,
1388                 .flags = RPC_TASK_ASYNC,
1389         };
1390         int status;
1391
1392         kref_get(&data->kref);
1393         data->rpc_done = 0;
1394         data->rpc_status = 0;
1395         data->timestamp = jiffies;
1396         task = rpc_run_task(&task_setup_data);
1397         if (IS_ERR(task))
1398                 return PTR_ERR(task);
1399         status = nfs4_wait_for_completion_rpc_task(task);
1400         if (status != 0) {
1401                 data->cancelled = 1;
1402                 smp_wmb();
1403         } else
1404                 status = data->rpc_status;
1405         rpc_put_task(task);
1406         return status;
1407 }
1408
1409 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1410 {
1411         struct nfs4_opendata *data = calldata;
1412         struct nfs4_state_owner *sp = data->owner;
1413
1414         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1415                 return;
1416         /*
1417          * Check if we still need to send an OPEN call, or if we can use
1418          * a delegation instead.
1419          */
1420         if (data->state != NULL) {
1421                 struct nfs_delegation *delegation;
1422
1423                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1424                         goto out_no_action;
1425                 rcu_read_lock();
1426                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1427                 if (delegation != NULL &&
1428                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1429                         rcu_read_unlock();
1430                         goto out_no_action;
1431                 }
1432                 rcu_read_unlock();
1433         }
1434         /* Update sequence id. */
1435         data->o_arg.id = sp->so_owner_id.id;
1436         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1437         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1438                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1439                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1440         }
1441         data->timestamp = jiffies;
1442         if (nfs4_setup_sequence(data->o_arg.server,
1443                                 &data->o_arg.seq_args,
1444                                 &data->o_res.seq_res, 1, task))
1445                 return;
1446         rpc_call_start(task);
1447         return;
1448 out_no_action:
1449         task->tk_action = NULL;
1450
1451 }
1452
1453 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1454 {
1455         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1456         nfs4_open_prepare(task, calldata);
1457 }
1458
1459 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1460 {
1461         struct nfs4_opendata *data = calldata;
1462
1463         data->rpc_status = task->tk_status;
1464
1465         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1466                 return;
1467
1468         if (task->tk_status == 0) {
1469                 switch (data->o_res.f_attr->mode & S_IFMT) {
1470                         case S_IFREG:
1471                                 break;
1472                         case S_IFLNK:
1473                                 data->rpc_status = -ELOOP;
1474                                 break;
1475                         case S_IFDIR:
1476                                 data->rpc_status = -EISDIR;
1477                                 break;
1478                         default:
1479                                 data->rpc_status = -ENOTDIR;
1480                 }
1481                 renew_lease(data->o_res.server, data->timestamp);
1482                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1483                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1484         }
1485         data->rpc_done = 1;
1486 }
1487
1488 static void nfs4_open_release(void *calldata)
1489 {
1490         struct nfs4_opendata *data = calldata;
1491         struct nfs4_state *state = NULL;
1492
1493         /* If this request hasn't been cancelled, do nothing */
1494         if (data->cancelled == 0)
1495                 goto out_free;
1496         /* In case of error, no cleanup! */
1497         if (data->rpc_status != 0 || !data->rpc_done)
1498                 goto out_free;
1499         /* In case we need an open_confirm, no cleanup! */
1500         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1501                 goto out_free;
1502         state = nfs4_opendata_to_nfs4_state(data);
1503         if (!IS_ERR(state))
1504                 nfs4_close_state(state, data->o_arg.fmode);
1505 out_free:
1506         nfs4_opendata_put(data);
1507 }
1508
1509 static const struct rpc_call_ops nfs4_open_ops = {
1510         .rpc_call_prepare = nfs4_open_prepare,
1511         .rpc_call_done = nfs4_open_done,
1512         .rpc_release = nfs4_open_release,
1513 };
1514
1515 static const struct rpc_call_ops nfs4_recover_open_ops = {
1516         .rpc_call_prepare = nfs4_recover_open_prepare,
1517         .rpc_call_done = nfs4_open_done,
1518         .rpc_release = nfs4_open_release,
1519 };
1520
1521 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1522 {
1523         struct inode *dir = data->dir->d_inode;
1524         struct nfs_server *server = NFS_SERVER(dir);
1525         struct nfs_openargs *o_arg = &data->o_arg;
1526         struct nfs_openres *o_res = &data->o_res;
1527         struct rpc_task *task;
1528         struct rpc_message msg = {
1529                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1530                 .rpc_argp = o_arg,
1531                 .rpc_resp = o_res,
1532                 .rpc_cred = data->owner->so_cred,
1533         };
1534         struct rpc_task_setup task_setup_data = {
1535                 .rpc_client = server->client,
1536                 .rpc_message = &msg,
1537                 .callback_ops = &nfs4_open_ops,
1538                 .callback_data = data,
1539                 .workqueue = nfsiod_workqueue,
1540                 .flags = RPC_TASK_ASYNC,
1541         };
1542         int status;
1543
1544         kref_get(&data->kref);
1545         data->rpc_done = 0;
1546         data->rpc_status = 0;
1547         data->cancelled = 0;
1548         if (isrecover)
1549                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1550         task = rpc_run_task(&task_setup_data);
1551         if (IS_ERR(task))
1552                 return PTR_ERR(task);
1553         status = nfs4_wait_for_completion_rpc_task(task);
1554         if (status != 0) {
1555                 data->cancelled = 1;
1556                 smp_wmb();
1557         } else
1558                 status = data->rpc_status;
1559         rpc_put_task(task);
1560
1561         return status;
1562 }
1563
1564 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1565 {
1566         struct inode *dir = data->dir->d_inode;
1567         struct nfs_openres *o_res = &data->o_res;
1568         int status;
1569
1570         status = nfs4_run_open_task(data, 1);
1571         if (status != 0 || !data->rpc_done)
1572                 return status;
1573
1574         nfs_refresh_inode(dir, o_res->dir_attr);
1575
1576         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1577                 status = _nfs4_proc_open_confirm(data);
1578                 if (status != 0)
1579                         return status;
1580         }
1581
1582         return status;
1583 }
1584
1585 /*
1586  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1587  */
1588 static int _nfs4_proc_open(struct nfs4_opendata *data)
1589 {
1590         struct inode *dir = data->dir->d_inode;
1591         struct nfs_server *server = NFS_SERVER(dir);
1592         struct nfs_openargs *o_arg = &data->o_arg;
1593         struct nfs_openres *o_res = &data->o_res;
1594         int status;
1595
1596         status = nfs4_run_open_task(data, 0);
1597         if (!data->rpc_done)
1598                 return status;
1599         if (status != 0) {
1600                 if (status == -NFS4ERR_BADNAME &&
1601                                 !(o_arg->open_flags & O_CREAT))
1602                         return -ENOENT;
1603                 return status;
1604         }
1605
1606         if (o_arg->open_flags & O_CREAT) {
1607                 update_changeattr(dir, &o_res->cinfo);
1608                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1609         } else
1610                 nfs_refresh_inode(dir, o_res->dir_attr);
1611         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1612                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1613         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1614                 status = _nfs4_proc_open_confirm(data);
1615                 if (status != 0)
1616                         return status;
1617         }
1618         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1619                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1620         return 0;
1621 }
1622
1623 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1624 {
1625         unsigned int loop;
1626         int ret;
1627
1628         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1629                 ret = nfs4_wait_clnt_recover(clp);
1630                 if (ret != 0)
1631                         break;
1632                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1633                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1634                         break;
1635                 nfs4_schedule_state_manager(clp);
1636                 ret = -EIO;
1637         }
1638         return ret;
1639 }
1640
1641 static int nfs4_recover_expired_lease(struct nfs_server *server)
1642 {
1643         return nfs4_client_recover_expired_lease(server->nfs_client);
1644 }
1645
1646 /*
1647  * OPEN_EXPIRED:
1648  *      reclaim state on the server after a network partition.
1649  *      Assumes caller holds the appropriate lock
1650  */
1651 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1652 {
1653         struct nfs4_opendata *opendata;
1654         int ret;
1655
1656         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1657         if (IS_ERR(opendata))
1658                 return PTR_ERR(opendata);
1659         ret = nfs4_open_recover(opendata, state);
1660         if (ret == -ESTALE)
1661                 d_drop(ctx->dentry);
1662         nfs4_opendata_put(opendata);
1663         return ret;
1664 }
1665
1666 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1667 {
1668         struct nfs_server *server = NFS_SERVER(state->inode);
1669         struct nfs4_exception exception = { };
1670         int err;
1671
1672         do {
1673                 err = _nfs4_open_expired(ctx, state);
1674                 switch (err) {
1675                 default:
1676                         goto out;
1677                 case -NFS4ERR_GRACE:
1678                 case -NFS4ERR_DELAY:
1679                         nfs4_handle_exception(server, err, &exception);
1680                         err = 0;
1681                 }
1682         } while (exception.retry);
1683 out:
1684         return err;
1685 }
1686
1687 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1688 {
1689         struct nfs_open_context *ctx;
1690         int ret;
1691
1692         ctx = nfs4_state_find_open_context(state);
1693         if (IS_ERR(ctx))
1694                 return PTR_ERR(ctx);
1695         ret = nfs4_do_open_expired(ctx, state);
1696         put_nfs_open_context(ctx);
1697         return ret;
1698 }
1699
1700 #if defined(CONFIG_NFS_V4_1)
1701 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1702 {
1703         int status;
1704         struct nfs_server *server = NFS_SERVER(state->inode);
1705
1706         status = nfs41_test_stateid(server, state);
1707         if (status == NFS_OK)
1708                 return 0;
1709         nfs41_free_stateid(server, state);
1710         return nfs4_open_expired(sp, state);
1711 }
1712 #endif
1713
1714 /*
1715  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1716  * fields corresponding to attributes that were used to store the verifier.
1717  * Make sure we clobber those fields in the later setattr call
1718  */
1719 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1720 {
1721         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1722             !(sattr->ia_valid & ATTR_ATIME_SET))
1723                 sattr->ia_valid |= ATTR_ATIME;
1724
1725         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1726             !(sattr->ia_valid & ATTR_MTIME_SET))
1727                 sattr->ia_valid |= ATTR_MTIME;
1728 }
1729
1730 /*
1731  * Returns a referenced nfs4_state
1732  */
1733 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)
1734 {
1735         struct nfs4_state_owner  *sp;
1736         struct nfs4_state     *state = NULL;
1737         struct nfs_server       *server = NFS_SERVER(dir);
1738         struct nfs4_opendata *opendata;
1739         int status;
1740
1741         /* Protect against reboot recovery conflicts */
1742         status = -ENOMEM;
1743         if (!(sp = nfs4_get_state_owner(server, cred))) {
1744                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1745                 goto out_err;
1746         }
1747         status = nfs4_recover_expired_lease(server);
1748         if (status != 0)
1749                 goto err_put_state_owner;
1750         if (dentry->d_inode != NULL)
1751                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1752         status = -ENOMEM;
1753         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1754         if (opendata == NULL)
1755                 goto err_put_state_owner;
1756
1757         if (dentry->d_inode != NULL)
1758                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1759
1760         status = _nfs4_proc_open(opendata);
1761         if (status != 0)
1762                 goto err_opendata_put;
1763
1764         state = nfs4_opendata_to_nfs4_state(opendata);
1765         status = PTR_ERR(state);
1766         if (IS_ERR(state))
1767                 goto err_opendata_put;
1768         if (server->caps & NFS_CAP_POSIX_LOCK)
1769                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1770
1771         if (opendata->o_arg.open_flags & O_EXCL) {
1772                 nfs4_exclusive_attrset(opendata, sattr);
1773
1774                 nfs_fattr_init(opendata->o_res.f_attr);
1775                 status = nfs4_do_setattr(state->inode, cred,
1776                                 opendata->o_res.f_attr, sattr,
1777                                 state);
1778                 if (status == 0)
1779                         nfs_setattr_update_inode(state->inode, sattr);
1780                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1781         }
1782         nfs4_opendata_put(opendata);
1783         nfs4_put_state_owner(sp);
1784         *res = state;
1785         return 0;
1786 err_opendata_put:
1787         nfs4_opendata_put(opendata);
1788 err_put_state_owner:
1789         nfs4_put_state_owner(sp);
1790 out_err:
1791         *res = NULL;
1792         return status;
1793 }
1794
1795
1796 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)
1797 {
1798         struct nfs4_exception exception = { };
1799         struct nfs4_state *res;
1800         int status;
1801
1802         do {
1803                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1804                 if (status == 0)
1805                         break;
1806                 /* NOTE: BAD_SEQID means the server and client disagree about the
1807                  * book-keeping w.r.t. state-changing operations
1808                  * (OPEN/CLOSE/LOCK/LOCKU...)
1809                  * It is actually a sign of a bug on the client or on the server.
1810                  *
1811                  * If we receive a BAD_SEQID error in the particular case of
1812                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1813                  * have unhashed the old state_owner for us, and that we can
1814                  * therefore safely retry using a new one. We should still warn
1815                  * the user though...
1816                  */
1817                 if (status == -NFS4ERR_BAD_SEQID) {
1818                         printk(KERN_WARNING "NFS: v4 server %s "
1819                                         " returned a bad sequence-id error!\n",
1820                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1821                         exception.retry = 1;
1822                         continue;
1823                 }
1824                 /*
1825                  * BAD_STATEID on OPEN means that the server cancelled our
1826                  * state before it received the OPEN_CONFIRM.
1827                  * Recover by retrying the request as per the discussion
1828                  * on Page 181 of RFC3530.
1829                  */
1830                 if (status == -NFS4ERR_BAD_STATEID) {
1831                         exception.retry = 1;
1832                         continue;
1833                 }
1834                 if (status == -EAGAIN) {
1835                         /* We must have found a delegation */
1836                         exception.retry = 1;
1837                         continue;
1838                 }
1839                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1840                                         status, &exception));
1841         } while (exception.retry);
1842         return res;
1843 }
1844
1845 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1846                             struct nfs_fattr *fattr, struct iattr *sattr,
1847                             struct nfs4_state *state)
1848 {
1849         struct nfs_server *server = NFS_SERVER(inode);
1850         struct nfs_setattrargs  arg = {
1851                 .fh             = NFS_FH(inode),
1852                 .iap            = sattr,
1853                 .server         = server,
1854                 .bitmask = server->attr_bitmask,
1855         };
1856         struct nfs_setattrres  res = {
1857                 .fattr          = fattr,
1858                 .server         = server,
1859         };
1860         struct rpc_message msg = {
1861                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1862                 .rpc_argp       = &arg,
1863                 .rpc_resp       = &res,
1864                 .rpc_cred       = cred,
1865         };
1866         unsigned long timestamp = jiffies;
1867         int status;
1868
1869         nfs_fattr_init(fattr);
1870
1871         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1872                 /* Use that stateid */
1873         } else if (state != NULL) {
1874                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1875         } else
1876                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1877
1878         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1879         if (status == 0 && state != NULL)
1880                 renew_lease(server, timestamp);
1881         return status;
1882 }
1883
1884 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1885                            struct nfs_fattr *fattr, struct iattr *sattr,
1886                            struct nfs4_state *state)
1887 {
1888         struct nfs_server *server = NFS_SERVER(inode);
1889         struct nfs4_exception exception = { };
1890         int err;
1891         do {
1892                 err = nfs4_handle_exception(server,
1893                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1894                                 &exception);
1895         } while (exception.retry);
1896         return err;
1897 }
1898
1899 struct nfs4_closedata {
1900         struct inode *inode;
1901         struct nfs4_state *state;
1902         struct nfs_closeargs arg;
1903         struct nfs_closeres res;
1904         struct nfs_fattr fattr;
1905         unsigned long timestamp;
1906         bool roc;
1907         u32 roc_barrier;
1908 };
1909
1910 static void nfs4_free_closedata(void *data)
1911 {
1912         struct nfs4_closedata *calldata = data;
1913         struct nfs4_state_owner *sp = calldata->state->owner;
1914         struct super_block *sb = calldata->state->inode->i_sb;
1915
1916         if (calldata->roc)
1917                 pnfs_roc_release(calldata->state->inode);
1918         nfs4_put_open_state(calldata->state);
1919         nfs_free_seqid(calldata->arg.seqid);
1920         nfs4_put_state_owner(sp);
1921         nfs_sb_deactive(sb);
1922         kfree(calldata);
1923 }
1924
1925 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1926                 fmode_t fmode)
1927 {
1928         spin_lock(&state->owner->so_lock);
1929         if (!(fmode & FMODE_READ))
1930                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1931         if (!(fmode & FMODE_WRITE))
1932                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1933         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1934         spin_unlock(&state->owner->so_lock);
1935 }
1936
1937 static void nfs4_close_done(struct rpc_task *task, void *data)
1938 {
1939         struct nfs4_closedata *calldata = data;
1940         struct nfs4_state *state = calldata->state;
1941         struct nfs_server *server = NFS_SERVER(calldata->inode);
1942
1943         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1944                 return;
1945         /* hmm. we are done with the inode, and in the process of freeing
1946          * the state_owner. we keep this around to process errors
1947          */
1948         switch (task->tk_status) {
1949                 case 0:
1950                         if (calldata->roc)
1951                                 pnfs_roc_set_barrier(state->inode,
1952                                                      calldata->roc_barrier);
1953                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1954                         renew_lease(server, calldata->timestamp);
1955                         nfs4_close_clear_stateid_flags(state,
1956                                         calldata->arg.fmode);
1957                         break;
1958                 case -NFS4ERR_STALE_STATEID:
1959                 case -NFS4ERR_OLD_STATEID:
1960                 case -NFS4ERR_BAD_STATEID:
1961                 case -NFS4ERR_EXPIRED:
1962                         if (calldata->arg.fmode == 0)
1963                                 break;
1964                 default:
1965                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1966                                 rpc_restart_call_prepare(task);
1967         }
1968         nfs_release_seqid(calldata->arg.seqid);
1969         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1970 }
1971
1972 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1973 {
1974         struct nfs4_closedata *calldata = data;
1975         struct nfs4_state *state = calldata->state;
1976         int call_close = 0;
1977
1978         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1979                 return;
1980
1981         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1982         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1983         spin_lock(&state->owner->so_lock);
1984         /* Calculate the change in open mode */
1985         if (state->n_rdwr == 0) {
1986                 if (state->n_rdonly == 0) {
1987                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1988                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1989                         calldata->arg.fmode &= ~FMODE_READ;
1990                 }
1991                 if (state->n_wronly == 0) {
1992                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1993                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1994                         calldata->arg.fmode &= ~FMODE_WRITE;
1995                 }
1996         }
1997         spin_unlock(&state->owner->so_lock);
1998
1999         if (!call_close) {
2000                 /* Note: exit _without_ calling nfs4_close_done */
2001                 task->tk_action = NULL;
2002                 return;
2003         }
2004
2005         if (calldata->arg.fmode == 0) {
2006                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2007                 if (calldata->roc &&
2008                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2009                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2010                                      task, NULL);
2011                         return;
2012                 }
2013         }
2014
2015         nfs_fattr_init(calldata->res.fattr);
2016         calldata->timestamp = jiffies;
2017         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2018                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2019                                 1, task))
2020                 return;
2021         rpc_call_start(task);
2022 }
2023
2024 static const struct rpc_call_ops nfs4_close_ops = {
2025         .rpc_call_prepare = nfs4_close_prepare,
2026         .rpc_call_done = nfs4_close_done,
2027         .rpc_release = nfs4_free_closedata,
2028 };
2029
2030 /*
2031  * It is possible for data to be read/written from a mem-mapped file
2032  * after the sys_close call (which hits the vfs layer as a flush).
2033  * This means that we can't safely call nfsv4 close on a file until
2034  * the inode is cleared. This in turn means that we are not good
2035  * NFSv4 citizens - we do not indicate to the server to update the file's
2036  * share state even when we are done with one of the three share
2037  * stateid's in the inode.
2038  *
2039  * NOTE: Caller must be holding the sp->so_owner semaphore!
2040  */
2041 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2042 {
2043         struct nfs_server *server = NFS_SERVER(state->inode);
2044         struct nfs4_closedata *calldata;
2045         struct nfs4_state_owner *sp = state->owner;
2046         struct rpc_task *task;
2047         struct rpc_message msg = {
2048                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2049                 .rpc_cred = state->owner->so_cred,
2050         };
2051         struct rpc_task_setup task_setup_data = {
2052                 .rpc_client = server->client,
2053                 .rpc_message = &msg,
2054                 .callback_ops = &nfs4_close_ops,
2055                 .workqueue = nfsiod_workqueue,
2056                 .flags = RPC_TASK_ASYNC,
2057         };
2058         int status = -ENOMEM;
2059
2060         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2061         if (calldata == NULL)
2062                 goto out;
2063         calldata->inode = state->inode;
2064         calldata->state = state;
2065         calldata->arg.fh = NFS_FH(state->inode);
2066         calldata->arg.stateid = &state->open_stateid;
2067         /* Serialization for the sequence id */
2068         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2069         if (calldata->arg.seqid == NULL)
2070                 goto out_free_calldata;
2071         calldata->arg.fmode = 0;
2072         calldata->arg.bitmask = server->cache_consistency_bitmask;
2073         calldata->res.fattr = &calldata->fattr;
2074         calldata->res.seqid = calldata->arg.seqid;
2075         calldata->res.server = server;
2076         calldata->roc = roc;
2077         nfs_sb_active(calldata->inode->i_sb);
2078
2079         msg.rpc_argp = &calldata->arg;
2080         msg.rpc_resp = &calldata->res;
2081         task_setup_data.callback_data = calldata;
2082         task = rpc_run_task(&task_setup_data);
2083         if (IS_ERR(task))
2084                 return PTR_ERR(task);
2085         status = 0;
2086         if (wait)
2087                 status = rpc_wait_for_completion_task(task);
2088         rpc_put_task(task);
2089         return status;
2090 out_free_calldata:
2091         kfree(calldata);
2092 out:
2093         if (roc)
2094                 pnfs_roc_release(state->inode);
2095         nfs4_put_open_state(state);
2096         nfs4_put_state_owner(sp);
2097         return status;
2098 }
2099
2100 static struct inode *
2101 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2102 {
2103         struct nfs4_state *state;
2104
2105         /* Protect against concurrent sillydeletes */
2106         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2107         if (IS_ERR(state))
2108                 return ERR_CAST(state);
2109         ctx->state = state;
2110         return igrab(state->inode);
2111 }
2112
2113 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2114 {
2115         if (ctx->state == NULL)
2116                 return;
2117         if (is_sync)
2118                 nfs4_close_sync(ctx->state, ctx->mode);
2119         else
2120                 nfs4_close_state(ctx->state, ctx->mode);
2121 }
2122
2123 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2124 {
2125         struct nfs4_server_caps_arg args = {
2126                 .fhandle = fhandle,
2127         };
2128         struct nfs4_server_caps_res res = {};
2129         struct rpc_message msg = {
2130                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2131                 .rpc_argp = &args,
2132                 .rpc_resp = &res,
2133         };
2134         int status;
2135
2136         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2137         if (status == 0) {
2138                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2139                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2140                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2141                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2142                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2143                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2144                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2145                         server->caps |= NFS_CAP_ACLS;
2146                 if (res.has_links != 0)
2147                         server->caps |= NFS_CAP_HARDLINKS;
2148                 if (res.has_symlinks != 0)
2149                         server->caps |= NFS_CAP_SYMLINKS;
2150                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2151                         server->caps |= NFS_CAP_FILEID;
2152                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2153                         server->caps |= NFS_CAP_MODE;
2154                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2155                         server->caps |= NFS_CAP_NLINK;
2156                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2157                         server->caps |= NFS_CAP_OWNER;
2158                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2159                         server->caps |= NFS_CAP_OWNER_GROUP;
2160                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2161                         server->caps |= NFS_CAP_ATIME;
2162                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2163                         server->caps |= NFS_CAP_CTIME;
2164                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2165                         server->caps |= NFS_CAP_MTIME;
2166
2167                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2168                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2169                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2170                 server->acl_bitmask = res.acl_bitmask;
2171         }
2172
2173         return status;
2174 }
2175
2176 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2177 {
2178         struct nfs4_exception exception = { };
2179         int err;
2180         do {
2181                 err = nfs4_handle_exception(server,
2182                                 _nfs4_server_capabilities(server, fhandle),
2183                                 &exception);
2184         } while (exception.retry);
2185         return err;
2186 }
2187
2188 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2189                 struct nfs_fsinfo *info)
2190 {
2191         struct nfs4_lookup_root_arg args = {
2192                 .bitmask = nfs4_fattr_bitmap,
2193         };
2194         struct nfs4_lookup_res res = {
2195                 .server = server,
2196                 .fattr = info->fattr,
2197                 .fh = fhandle,
2198         };
2199         struct rpc_message msg = {
2200                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2201                 .rpc_argp = &args,
2202                 .rpc_resp = &res,
2203         };
2204
2205         nfs_fattr_init(info->fattr);
2206         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2207 }
2208
2209 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2210                 struct nfs_fsinfo *info)
2211 {
2212         struct nfs4_exception exception = { };
2213         int err;
2214         do {
2215                 err = _nfs4_lookup_root(server, fhandle, info);
2216                 switch (err) {
2217                 case 0:
2218                 case -NFS4ERR_WRONGSEC:
2219                         break;
2220                 default:
2221                         err = nfs4_handle_exception(server, err, &exception);
2222                 }
2223         } while (exception.retry);
2224         return err;
2225 }
2226
2227 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2228                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2229 {
2230         struct rpc_auth *auth;
2231         int ret;
2232
2233         auth = rpcauth_create(flavor, server->client);
2234         if (!auth) {
2235                 ret = -EIO;
2236                 goto out;
2237         }
2238         ret = nfs4_lookup_root(server, fhandle, info);
2239 out:
2240         return ret;
2241 }
2242
2243 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2244                               struct nfs_fsinfo *info)
2245 {
2246         int i, len, status = 0;
2247         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2248
2249         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2250         flav_array[len] = RPC_AUTH_NULL;
2251         len += 1;
2252
2253         for (i = 0; i < len; i++) {
2254                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2255                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2256                         continue;
2257                 break;
2258         }
2259         /*
2260          * -EACCESS could mean that the user doesn't have correct permissions
2261          * to access the mount.  It could also mean that we tried to mount
2262          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2263          * existing mount programs don't handle -EACCES very well so it should
2264          * be mapped to -EPERM instead.
2265          */
2266         if (status == -EACCES)
2267                 status = -EPERM;
2268         return status;
2269 }
2270
2271 /*
2272  * get the file handle for the "/" directory on the server
2273  */
2274 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2275                               struct nfs_fsinfo *info)
2276 {
2277         int minor_version = server->nfs_client->cl_minorversion;
2278         int status = nfs4_lookup_root(server, fhandle, info);
2279         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2280                 /*
2281                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2282                  * by nfs4_map_errors() as this function exits.
2283                  */
2284                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2285         if (status == 0)
2286                 status = nfs4_server_capabilities(server, fhandle);
2287         if (status == 0)
2288                 status = nfs4_do_fsinfo(server, fhandle, info);
2289         return nfs4_map_errors(status);
2290 }
2291
2292 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2293 /*
2294  * Get locations and (maybe) other attributes of a referral.
2295  * Note that we'll actually follow the referral later when
2296  * we detect fsid mismatch in inode revalidation
2297  */
2298 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2299                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2300 {
2301         int status = -ENOMEM;
2302         struct page *page = NULL;
2303         struct nfs4_fs_locations *locations = NULL;
2304
2305         page = alloc_page(GFP_KERNEL);
2306         if (page == NULL)
2307                 goto out;
2308         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2309         if (locations == NULL)
2310                 goto out;
2311
2312         status = nfs4_proc_fs_locations(dir, name, locations, page);
2313         if (status != 0)
2314                 goto out;
2315         /* Make sure server returned a different fsid for the referral */
2316         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2317                 dprintk("%s: server did not return a different fsid for"
2318                         " a referral at %s\n", __func__, name->name);
2319                 status = -EIO;
2320                 goto out;
2321         }
2322         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2323         nfs_fixup_referral_attributes(&locations->fattr);
2324
2325         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2326         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2327         memset(fhandle, 0, sizeof(struct nfs_fh));
2328 out:
2329         if (page)
2330                 __free_page(page);
2331         kfree(locations);
2332         return status;
2333 }
2334
2335 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2336 {
2337         struct nfs4_getattr_arg args = {
2338                 .fh = fhandle,
2339                 .bitmask = server->attr_bitmask,
2340         };
2341         struct nfs4_getattr_res res = {
2342                 .fattr = fattr,
2343                 .server = server,
2344         };
2345         struct rpc_message msg = {
2346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2347                 .rpc_argp = &args,
2348                 .rpc_resp = &res,
2349         };
2350
2351         nfs_fattr_init(fattr);
2352         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2353 }
2354
2355 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2356 {
2357         struct nfs4_exception exception = { };
2358         int err;
2359         do {
2360                 err = nfs4_handle_exception(server,
2361                                 _nfs4_proc_getattr(server, fhandle, fattr),
2362                                 &exception);
2363         } while (exception.retry);
2364         return err;
2365 }
2366
2367 /*
2368  * The file is not closed if it is opened due to the a request to change
2369  * the size of the file. The open call will not be needed once the
2370  * VFS layer lookup-intents are implemented.
2371  *
2372  * Close is called when the inode is destroyed.
2373  * If we haven't opened the file for O_WRONLY, we
2374  * need to in the size_change case to obtain a stateid.
2375  *
2376  * Got race?
2377  * Because OPEN is always done by name in nfsv4, it is
2378  * possible that we opened a different file by the same
2379  * name.  We can recognize this race condition, but we
2380  * can't do anything about it besides returning an error.
2381  *
2382  * This will be fixed with VFS changes (lookup-intent).
2383  */
2384 static int
2385 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2386                   struct iattr *sattr)
2387 {
2388         struct inode *inode = dentry->d_inode;
2389         struct rpc_cred *cred = NULL;
2390         struct nfs4_state *state = NULL;
2391         int status;
2392
2393         if (pnfs_ld_layoutret_on_setattr(inode))
2394                 pnfs_return_layout(inode);
2395
2396         nfs_fattr_init(fattr);
2397
2398         /* Search for an existing open(O_WRITE) file */
2399         if (sattr->ia_valid & ATTR_FILE) {
2400                 struct nfs_open_context *ctx;
2401
2402                 ctx = nfs_file_open_context(sattr->ia_file);
2403                 if (ctx) {
2404                         cred = ctx->cred;
2405                         state = ctx->state;
2406                 }
2407         }
2408
2409         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2410         if (status == 0)
2411                 nfs_setattr_update_inode(inode, sattr);
2412         return status;
2413 }
2414
2415 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2416                 const struct qstr *name, struct nfs_fh *fhandle,
2417                 struct nfs_fattr *fattr)
2418 {
2419         struct nfs_server *server = NFS_SERVER(dir);
2420         int                    status;
2421         struct nfs4_lookup_arg args = {
2422                 .bitmask = server->attr_bitmask,
2423                 .dir_fh = NFS_FH(dir),
2424                 .name = name,
2425         };
2426         struct nfs4_lookup_res res = {
2427                 .server = server,
2428                 .fattr = fattr,
2429                 .fh = fhandle,
2430         };
2431         struct rpc_message msg = {
2432                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2433                 .rpc_argp = &args,
2434                 .rpc_resp = &res,
2435         };
2436
2437         nfs_fattr_init(fattr);
2438
2439         dprintk("NFS call  lookup %s\n", name->name);
2440         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2441         dprintk("NFS reply lookup: %d\n", status);
2442         return status;
2443 }
2444
2445 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2446 {
2447         memset(fh, 0, sizeof(struct nfs_fh));
2448         fattr->fsid.major = 1;
2449         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2450                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2451         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2452         fattr->nlink = 2;
2453 }
2454
2455 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2456                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2457 {
2458         struct nfs4_exception exception = { };
2459         int err;
2460         do {
2461                 int status;
2462
2463                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2464                 switch (status) {
2465                 case -NFS4ERR_BADNAME:
2466                         return -ENOENT;
2467                 case -NFS4ERR_MOVED:
2468                         return nfs4_get_referral(dir, name, fattr, fhandle);
2469                 case -NFS4ERR_WRONGSEC:
2470                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2471                 }
2472                 err = nfs4_handle_exception(NFS_SERVER(dir),
2473                                 status, &exception);
2474         } while (exception.retry);
2475         return err;
2476 }
2477
2478 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2479 {
2480         struct nfs_server *server = NFS_SERVER(inode);
2481         struct nfs4_accessargs args = {
2482                 .fh = NFS_FH(inode),
2483                 .bitmask = server->attr_bitmask,
2484         };
2485         struct nfs4_accessres res = {
2486                 .server = server,
2487         };
2488         struct rpc_message msg = {
2489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2490                 .rpc_argp = &args,
2491                 .rpc_resp = &res,
2492                 .rpc_cred = entry->cred,
2493         };
2494         int mode = entry->mask;
2495         int status;
2496
2497         /*
2498          * Determine which access bits we want to ask for...
2499          */
2500         if (mode & MAY_READ)
2501                 args.access |= NFS4_ACCESS_READ;
2502         if (S_ISDIR(inode->i_mode)) {
2503                 if (mode & MAY_WRITE)
2504                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2505                 if (mode & MAY_EXEC)
2506                         args.access |= NFS4_ACCESS_LOOKUP;
2507         } else {
2508                 if (mode & MAY_WRITE)
2509                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2510                 if (mode & MAY_EXEC)
2511                         args.access |= NFS4_ACCESS_EXECUTE;
2512         }
2513
2514         res.fattr = nfs_alloc_fattr();
2515         if (res.fattr == NULL)
2516                 return -ENOMEM;
2517
2518         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2519         if (!status) {
2520                 entry->mask = 0;
2521                 if (res.access & NFS4_ACCESS_READ)
2522                         entry->mask |= MAY_READ;
2523                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2524                         entry->mask |= MAY_WRITE;
2525                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2526                         entry->mask |= MAY_EXEC;
2527                 nfs_refresh_inode(inode, res.fattr);
2528         }
2529         nfs_free_fattr(res.fattr);
2530         return status;
2531 }
2532
2533 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2534 {
2535         struct nfs4_exception exception = { };
2536         int err;
2537         do {
2538                 err = nfs4_handle_exception(NFS_SERVER(inode),
2539                                 _nfs4_proc_access(inode, entry),
2540                                 &exception);
2541         } while (exception.retry);
2542         return err;
2543 }
2544
2545 /*
2546  * TODO: For the time being, we don't try to get any attributes
2547  * along with any of the zero-copy operations READ, READDIR,
2548  * READLINK, WRITE.
2549  *
2550  * In the case of the first three, we want to put the GETATTR
2551  * after the read-type operation -- this is because it is hard
2552  * to predict the length of a GETATTR response in v4, and thus
2553  * align the READ data correctly.  This means that the GETATTR
2554  * may end up partially falling into the page cache, and we should
2555  * shift it into the 'tail' of the xdr_buf before processing.
2556  * To do this efficiently, we need to know the total length
2557  * of data received, which doesn't seem to be available outside
2558  * of the RPC layer.
2559  *
2560  * In the case of WRITE, we also want to put the GETATTR after
2561  * the operation -- in this case because we want to make sure
2562  * we get the post-operation mtime and size.  This means that
2563  * we can't use xdr_encode_pages() as written: we need a variant
2564  * of it which would leave room in the 'tail' iovec.
2565  *
2566  * Both of these changes to the XDR layer would in fact be quite
2567  * minor, but I decided to leave them for a subsequent patch.
2568  */
2569 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2570                 unsigned int pgbase, unsigned int pglen)
2571 {
2572         struct nfs4_readlink args = {
2573                 .fh       = NFS_FH(inode),
2574                 .pgbase   = pgbase,
2575                 .pglen    = pglen,
2576                 .pages    = &page,
2577         };
2578         struct nfs4_readlink_res res;
2579         struct rpc_message msg = {
2580                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2581                 .rpc_argp = &args,
2582                 .rpc_resp = &res,
2583         };
2584
2585         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2586 }
2587
2588 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2589                 unsigned int pgbase, unsigned int pglen)
2590 {
2591         struct nfs4_exception exception = { };
2592         int err;
2593         do {
2594                 err = nfs4_handle_exception(NFS_SERVER(inode),
2595                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2596                                 &exception);
2597         } while (exception.retry);
2598         return err;
2599 }
2600
2601 /*
2602  * Got race?
2603  * We will need to arrange for the VFS layer to provide an atomic open.
2604  * Until then, this create/open method is prone to inefficiency and race
2605  * conditions due to the lookup, create, and open VFS calls from sys_open()
2606  * placed on the wire.
2607  *
2608  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2609  * The file will be opened again in the subsequent VFS open call
2610  * (nfs4_proc_file_open).
2611  *
2612  * The open for read will just hang around to be used by any process that
2613  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2614  */
2615
2616 static int
2617 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2618                  int flags, struct nfs_open_context *ctx)
2619 {
2620         struct dentry *de = dentry;
2621         struct nfs4_state *state;
2622         struct rpc_cred *cred = NULL;
2623         fmode_t fmode = 0;
2624         int status = 0;
2625
2626         if (ctx != NULL) {
2627                 cred = ctx->cred;
2628                 de = ctx->dentry;
2629                 fmode = ctx->mode;
2630         }
2631         sattr->ia_mode &= ~current_umask();
2632         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2633         d_drop(dentry);
2634         if (IS_ERR(state)) {
2635                 status = PTR_ERR(state);
2636                 goto out;
2637         }
2638         d_add(dentry, igrab(state->inode));
2639         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2640         if (ctx != NULL)
2641                 ctx->state = state;
2642         else
2643                 nfs4_close_sync(state, fmode);
2644 out:
2645         return status;
2646 }
2647
2648 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2649 {
2650         struct nfs_server *server = NFS_SERVER(dir);
2651         struct nfs_removeargs args = {
2652                 .fh = NFS_FH(dir),
2653                 .name.len = name->len,
2654                 .name.name = name->name,
2655                 .bitmask = server->attr_bitmask,
2656         };
2657         struct nfs_removeres res = {
2658                 .server = server,
2659         };
2660         struct rpc_message msg = {
2661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2662                 .rpc_argp = &args,
2663                 .rpc_resp = &res,
2664         };
2665         int status = -ENOMEM;
2666
2667         res.dir_attr = nfs_alloc_fattr();
2668         if (res.dir_attr == NULL)
2669                 goto out;
2670
2671         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2672         if (status == 0) {
2673                 update_changeattr(dir, &res.cinfo);
2674                 nfs_post_op_update_inode(dir, res.dir_attr);
2675         }
2676         nfs_free_fattr(res.dir_attr);
2677 out:
2678         return status;
2679 }
2680
2681 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2682 {
2683         struct nfs4_exception exception = { };
2684         int err;
2685         do {
2686                 err = nfs4_handle_exception(NFS_SERVER(dir),
2687                                 _nfs4_proc_remove(dir, name),
2688                                 &exception);
2689         } while (exception.retry);
2690         return err;
2691 }
2692
2693 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2694 {
2695         struct nfs_server *server = NFS_SERVER(dir);
2696         struct nfs_removeargs *args = msg->rpc_argp;
2697         struct nfs_removeres *res = msg->rpc_resp;
2698
2699         args->bitmask = server->cache_consistency_bitmask;
2700         res->server = server;
2701         res->seq_res.sr_slot = NULL;
2702         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2703 }
2704
2705 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2706 {
2707         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2708
2709         if (!nfs4_sequence_done(task, &res->seq_res))
2710                 return 0;
2711         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2712                 return 0;
2713         update_changeattr(dir, &res->cinfo);
2714         nfs_post_op_update_inode(dir, res->dir_attr);
2715         return 1;
2716 }
2717
2718 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2719 {
2720         struct nfs_server *server = NFS_SERVER(dir);
2721         struct nfs_renameargs *arg = msg->rpc_argp;
2722         struct nfs_renameres *res = msg->rpc_resp;
2723
2724         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2725         arg->bitmask = server->attr_bitmask;
2726         res->server = server;
2727 }
2728
2729 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2730                                  struct inode *new_dir)
2731 {
2732         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2733
2734         if (!nfs4_sequence_done(task, &res->seq_res))
2735                 return 0;
2736         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2737                 return 0;
2738
2739         update_changeattr(old_dir, &res->old_cinfo);
2740         nfs_post_op_update_inode(old_dir, res->old_fattr);
2741         update_changeattr(new_dir, &res->new_cinfo);
2742         nfs_post_op_update_inode(new_dir, res->new_fattr);
2743         return 1;
2744 }
2745
2746 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2747                 struct inode *new_dir, struct qstr *new_name)
2748 {
2749         struct nfs_server *server = NFS_SERVER(old_dir);
2750         struct nfs_renameargs arg = {
2751                 .old_dir = NFS_FH(old_dir),
2752                 .new_dir = NFS_FH(new_dir),
2753                 .old_name = old_name,
2754                 .new_name = new_name,
2755                 .bitmask = server->attr_bitmask,
2756         };
2757         struct nfs_renameres res = {
2758                 .server = server,
2759         };
2760         struct rpc_message msg = {
2761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2762                 .rpc_argp = &arg,
2763                 .rpc_resp = &res,
2764         };
2765         int status = -ENOMEM;
2766
2767         res.old_fattr = nfs_alloc_fattr();
2768         res.new_fattr = nfs_alloc_fattr();
2769         if (res.old_fattr == NULL || res.new_fattr == NULL)
2770                 goto out;
2771
2772         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2773         if (!status) {
2774                 update_changeattr(old_dir, &res.old_cinfo);
2775                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2776                 update_changeattr(new_dir, &res.new_cinfo);
2777                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2778         }
2779 out:
2780         nfs_free_fattr(res.new_fattr);
2781         nfs_free_fattr(res.old_fattr);
2782         return status;
2783 }
2784
2785 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2786                 struct inode *new_dir, struct qstr *new_name)
2787 {
2788         struct nfs4_exception exception = { };
2789         int err;
2790         do {
2791                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2792                                 _nfs4_proc_rename(old_dir, old_name,
2793                                         new_dir, new_name),
2794                                 &exception);
2795         } while (exception.retry);
2796         return err;
2797 }
2798
2799 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2800 {
2801         struct nfs_server *server = NFS_SERVER(inode);
2802         struct nfs4_link_arg arg = {
2803                 .fh     = NFS_FH(inode),
2804                 .dir_fh = NFS_FH(dir),
2805                 .name   = name,
2806                 .bitmask = server->attr_bitmask,
2807         };
2808         struct nfs4_link_res res = {
2809                 .server = server,
2810         };
2811         struct rpc_message msg = {
2812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2813                 .rpc_argp = &arg,
2814                 .rpc_resp = &res,
2815         };
2816         int status = -ENOMEM;
2817
2818         res.fattr = nfs_alloc_fattr();
2819         res.dir_attr = nfs_alloc_fattr();
2820         if (res.fattr == NULL || res.dir_attr == NULL)
2821                 goto out;
2822
2823         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2824         if (!status) {
2825                 update_changeattr(dir, &res.cinfo);
2826                 nfs_post_op_update_inode(dir, res.dir_attr);
2827                 nfs_post_op_update_inode(inode, res.fattr);
2828         }
2829 out:
2830         nfs_free_fattr(res.dir_attr);
2831         nfs_free_fattr(res.fattr);
2832         return status;
2833 }
2834
2835 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2836 {
2837         struct nfs4_exception exception = { };
2838         int err;
2839         do {
2840                 err = nfs4_handle_exception(NFS_SERVER(inode),
2841                                 _nfs4_proc_link(inode, dir, name),
2842                                 &exception);
2843         } while (exception.retry);
2844         return err;
2845 }
2846
2847 struct nfs4_createdata {
2848         struct rpc_message msg;
2849         struct nfs4_create_arg arg;
2850         struct nfs4_create_res res;
2851         struct nfs_fh fh;
2852         struct nfs_fattr fattr;
2853         struct nfs_fattr dir_fattr;
2854 };
2855
2856 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2857                 struct qstr *name, struct iattr *sattr, u32 ftype)
2858 {
2859         struct nfs4_createdata *data;
2860
2861         data = kzalloc(sizeof(*data), GFP_KERNEL);
2862         if (data != NULL) {
2863                 struct nfs_server *server = NFS_SERVER(dir);
2864
2865                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2866                 data->msg.rpc_argp = &data->arg;
2867                 data->msg.rpc_resp = &data->res;
2868                 data->arg.dir_fh = NFS_FH(dir);
2869                 data->arg.server = server;
2870                 data->arg.name = name;
2871                 data->arg.attrs = sattr;
2872                 data->arg.ftype = ftype;
2873                 data->arg.bitmask = server->attr_bitmask;
2874                 data->res.server = server;
2875                 data->res.fh = &data->fh;
2876                 data->res.fattr = &data->fattr;
2877                 data->res.dir_fattr = &data->dir_fattr;
2878                 nfs_fattr_init(data->res.fattr);
2879                 nfs_fattr_init(data->res.dir_fattr);
2880         }
2881         return data;
2882 }
2883
2884 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2885 {
2886         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2887                                     &data->arg.seq_args, &data->res.seq_res, 1);
2888         if (status == 0) {
2889                 update_changeattr(dir, &data->res.dir_cinfo);
2890                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2891                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2892         }
2893         return status;
2894 }
2895
2896 static void nfs4_free_createdata(struct nfs4_createdata *data)
2897 {
2898         kfree(data);
2899 }
2900
2901 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2902                 struct page *page, unsigned int len, struct iattr *sattr)
2903 {
2904         struct nfs4_createdata *data;
2905         int status = -ENAMETOOLONG;
2906
2907         if (len > NFS4_MAXPATHLEN)
2908                 goto out;
2909
2910         status = -ENOMEM;
2911         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2912         if (data == NULL)
2913                 goto out;
2914
2915         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2916         data->arg.u.symlink.pages = &page;
2917         data->arg.u.symlink.len = len;
2918
2919         status = nfs4_do_create(dir, dentry, data);
2920
2921         nfs4_free_createdata(data);
2922 out:
2923         return status;
2924 }
2925
2926 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2927                 struct page *page, unsigned int len, struct iattr *sattr)
2928 {
2929         struct nfs4_exception exception = { };
2930         int err;
2931         do {
2932                 err = nfs4_handle_exception(NFS_SERVER(dir),
2933                                 _nfs4_proc_symlink(dir, dentry, page,
2934                                                         len, sattr),
2935                                 &exception);
2936         } while (exception.retry);
2937         return err;
2938 }
2939
2940 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2941                 struct iattr *sattr)
2942 {
2943         struct nfs4_createdata *data;
2944         int status = -ENOMEM;
2945
2946         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2947         if (data == NULL)
2948                 goto out;
2949
2950         status = nfs4_do_create(dir, dentry, data);
2951
2952         nfs4_free_createdata(data);
2953 out:
2954         return status;
2955 }
2956
2957 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2958                 struct iattr *sattr)
2959 {
2960         struct nfs4_exception exception = { };
2961         int err;
2962
2963         sattr->ia_mode &= ~current_umask();
2964         do {
2965                 err = nfs4_handle_exception(NFS_SERVER(dir),
2966                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2967                                 &exception);
2968         } while (exception.retry);
2969         return err;
2970 }
2971
2972 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2973                 u64 cookie, struct page **pages, unsigned int count, int plus)
2974 {
2975         struct inode            *dir = dentry->d_inode;
2976         struct nfs4_readdir_arg args = {
2977                 .fh = NFS_FH(dir),
2978                 .pages = pages,
2979                 .pgbase = 0,
2980                 .count = count,
2981                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2982                 .plus = plus,
2983         };
2984         struct nfs4_readdir_res res;
2985         struct rpc_message msg = {
2986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2987                 .rpc_argp = &args,
2988                 .rpc_resp = &res,
2989                 .rpc_cred = cred,
2990         };
2991         int                     status;
2992
2993         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2994                         dentry->d_parent->d_name.name,
2995                         dentry->d_name.name,
2996                         (unsigned long long)cookie);
2997         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2998         res.pgbase = args.pgbase;
2999         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3000         if (status >= 0) {
3001                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3002                 status += args.pgbase;
3003         }
3004
3005         nfs_invalidate_atime(dir);
3006
3007         dprintk("%s: returns %d\n", __func__, status);
3008         return status;
3009 }
3010
3011 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3012                 u64 cookie, struct page **pages, unsigned int count, int plus)
3013 {
3014         struct nfs4_exception exception = { };
3015         int err;
3016         do {
3017                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3018                                 _nfs4_proc_readdir(dentry, cred, cookie,
3019                                         pages, count, plus),
3020                                 &exception);
3021         } while (exception.retry);
3022         return err;
3023 }
3024
3025 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3026                 struct iattr *sattr, dev_t rdev)
3027 {
3028         struct nfs4_createdata *data;
3029         int mode = sattr->ia_mode;
3030         int status = -ENOMEM;
3031
3032         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3033         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3034
3035         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3036         if (data == NULL)
3037                 goto out;
3038
3039         if (S_ISFIFO(mode))
3040                 data->arg.ftype = NF4FIFO;
3041         else if (S_ISBLK(mode)) {
3042                 data->arg.ftype = NF4BLK;
3043                 data->arg.u.device.specdata1 = MAJOR(rdev);
3044                 data->arg.u.device.specdata2 = MINOR(rdev);
3045         }
3046         else if (S_ISCHR(mode)) {
3047                 data->arg.ftype = NF4CHR;
3048                 data->arg.u.device.specdata1 = MAJOR(rdev);
3049                 data->arg.u.device.specdata2 = MINOR(rdev);
3050         }
3051
3052         status = nfs4_do_create(dir, dentry, data);
3053
3054         nfs4_free_createdata(data);
3055 out:
3056         return status;
3057 }
3058
3059 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3060                 struct iattr *sattr, dev_t rdev)
3061 {
3062         struct nfs4_exception exception = { };
3063         int err;
3064
3065         sattr->ia_mode &= ~current_umask();
3066         do {
3067                 err = nfs4_handle_exception(NFS_SERVER(dir),
3068                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3069                                 &exception);
3070         } while (exception.retry);
3071         return err;
3072 }
3073
3074 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3075                  struct nfs_fsstat *fsstat)
3076 {
3077         struct nfs4_statfs_arg args = {
3078                 .fh = fhandle,
3079                 .bitmask = server->attr_bitmask,
3080         };
3081         struct nfs4_statfs_res res = {
3082                 .fsstat = fsstat,
3083         };
3084         struct rpc_message msg = {
3085                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3086                 .rpc_argp = &args,
3087                 .rpc_resp = &res,
3088         };
3089
3090         nfs_fattr_init(fsstat->fattr);
3091         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3092 }
3093
3094 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3095 {
3096         struct nfs4_exception exception = { };
3097         int err;
3098         do {
3099                 err = nfs4_handle_exception(server,
3100                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3101                                 &exception);
3102         } while (exception.retry);
3103         return err;
3104 }
3105
3106 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3107                 struct nfs_fsinfo *fsinfo)
3108 {
3109         struct nfs4_fsinfo_arg args = {
3110                 .fh = fhandle,
3111                 .bitmask = server->attr_bitmask,
3112         };
3113         struct nfs4_fsinfo_res res = {
3114                 .fsinfo = fsinfo,
3115         };
3116         struct rpc_message msg = {
3117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3118                 .rpc_argp = &args,
3119                 .rpc_resp = &res,
3120         };
3121
3122         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3123 }
3124
3125 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3126 {
3127         struct nfs4_exception exception = { };
3128         int err;
3129
3130         do {
3131                 err = nfs4_handle_exception(server,
3132                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3133                                 &exception);
3134         } while (exception.retry);
3135         return err;
3136 }
3137
3138 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3139 {
3140         nfs_fattr_init(fsinfo->fattr);
3141         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3142 }
3143
3144 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3145                 struct nfs_pathconf *pathconf)
3146 {
3147         struct nfs4_pathconf_arg args = {
3148                 .fh = fhandle,
3149                 .bitmask = server->attr_bitmask,
3150         };
3151         struct nfs4_pathconf_res res = {
3152                 .pathconf = pathconf,
3153         };
3154         struct rpc_message msg = {
3155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3156                 .rpc_argp = &args,
3157                 .rpc_resp = &res,
3158         };
3159
3160         /* None of the pathconf attributes are mandatory to implement */
3161         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3162                 memset(pathconf, 0, sizeof(*pathconf));
3163                 return 0;
3164         }
3165
3166         nfs_fattr_init(pathconf->fattr);
3167         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3168 }
3169
3170 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3171                 struct nfs_pathconf *pathconf)
3172 {
3173         struct nfs4_exception exception = { };
3174         int err;
3175
3176         do {
3177                 err = nfs4_handle_exception(server,
3178                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3179                                 &exception);
3180         } while (exception.retry);
3181         return err;
3182 }
3183
3184 void __nfs4_read_done_cb(struct nfs_read_data *data)
3185 {
3186         nfs_invalidate_atime(data->inode);
3187 }
3188
3189 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3190 {
3191         struct nfs_server *server = NFS_SERVER(data->inode);
3192
3193         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3194                 rpc_restart_call_prepare(task);
3195                 return -EAGAIN;
3196         }
3197
3198         __nfs4_read_done_cb(data);
3199         if (task->tk_status > 0)
3200                 renew_lease(server, data->timestamp);
3201         return 0;
3202 }
3203
3204 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3205 {
3206
3207         dprintk("--> %s\n", __func__);
3208
3209         if (!nfs4_sequence_done(task, &data->res.seq_res))
3210                 return -EAGAIN;
3211
3212         return data->read_done_cb ? data->read_done_cb(task, data) :
3213                                     nfs4_read_done_cb(task, data);
3214 }
3215
3216 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3217 {
3218         data->timestamp   = jiffies;
3219         data->read_done_cb = nfs4_read_done_cb;
3220         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3221 }
3222
3223 /* Reset the the nfs_read_data to send the read to the MDS. */
3224 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3225 {
3226         dprintk("%s Reset task for i/o through\n", __func__);
3227         put_lseg(data->lseg);
3228         data->lseg = NULL;
3229         /* offsets will differ in the dense stripe case */
3230         data->args.offset = data->mds_offset;
3231         data->ds_clp = NULL;
3232         data->args.fh     = NFS_FH(data->inode);
3233         data->read_done_cb = nfs4_read_done_cb;
3234         task->tk_ops = data->mds_ops;
3235         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3236 }
3237 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3238
3239 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3240 {
3241         struct inode *inode = data->inode;
3242
3243         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3244                 rpc_restart_call_prepare(task);
3245                 return -EAGAIN;
3246         }
3247         if (task->tk_status >= 0) {
3248                 renew_lease(NFS_SERVER(inode), data->timestamp);
3249                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3250         }
3251         return 0;
3252 }
3253
3254 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3255 {
3256         if (!nfs4_sequence_done(task, &data->res.seq_res))
3257                 return -EAGAIN;
3258         return data->write_done_cb ? data->write_done_cb(task, data) :
3259                 nfs4_write_done_cb(task, data);
3260 }
3261
3262 /* Reset the the nfs_write_data to send the write to the MDS. */
3263 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3264 {
3265         dprintk("%s Reset task for i/o through\n", __func__);
3266         put_lseg(data->lseg);
3267         data->lseg          = NULL;
3268         data->ds_clp        = NULL;
3269         data->write_done_cb = nfs4_write_done_cb;
3270         data->args.fh       = NFS_FH(data->inode);
3271         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3272         data->args.offset   = data->mds_offset;
3273         data->res.fattr     = &data->fattr;
3274         task->tk_ops        = data->mds_ops;
3275         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3276 }
3277 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3278
3279 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3280 {
3281         struct nfs_server *server = NFS_SERVER(data->inode);
3282
3283         if (data->lseg) {
3284                 data->args.bitmask = NULL;
3285                 data->res.fattr = NULL;
3286         } else
3287                 data->args.bitmask = server->cache_consistency_bitmask;
3288         if (!data->write_done_cb)
3289                 data->write_done_cb = nfs4_write_done_cb;
3290         data->res.server = server;
3291         data->timestamp   = jiffies;
3292
3293         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3294 }
3295
3296 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3297 {
3298         struct inode *inode = data->inode;
3299
3300         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3301                 rpc_restart_call_prepare(task);
3302                 return -EAGAIN;
3303         }
3304         nfs_refresh_inode(inode, data->res.fattr);
3305         return 0;
3306 }
3307
3308 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3309 {
3310         if (!nfs4_sequence_done(task, &data->res.seq_res))
3311                 return -EAGAIN;
3312         return data->write_done_cb(task, data);
3313 }
3314
3315 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3316 {
3317         struct nfs_server *server = NFS_SERVER(data->inode);
3318
3319         if (data->lseg) {
3320                 data->args.bitmask = NULL;
3321                 data->res.fattr = NULL;
3322         } else
3323                 data->args.bitmask = server->cache_consistency_bitmask;
3324         if (!data->write_done_cb)
3325                 data->write_done_cb = nfs4_commit_done_cb;
3326         data->res.server = server;
3327         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3328 }
3329
3330 struct nfs4_renewdata {
3331         struct nfs_client       *client;
3332         unsigned long           timestamp;
3333 };
3334
3335 /*
3336  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3337  * standalone procedure for queueing an asynchronous RENEW.
3338  */
3339 static void nfs4_renew_release(void *calldata)
3340 {
3341         struct nfs4_renewdata *data = calldata;
3342         struct nfs_client *clp = data->client;
3343
3344         if (atomic_read(&clp->cl_count) > 1)
3345                 nfs4_schedule_state_renewal(clp);
3346         nfs_put_client(clp);
3347         kfree(data);
3348 }
3349
3350 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3351 {
3352         struct nfs4_renewdata *data = calldata;
3353         struct nfs_client *clp = data->client;
3354         unsigned long timestamp = data->timestamp;
3355
3356         if (task->tk_status < 0) {
3357                 /* Unless we're shutting down, schedule state recovery! */
3358                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3359                         return;
3360                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3361                         nfs4_schedule_lease_recovery(clp);
3362                         return;
3363                 }
3364                 nfs4_schedule_path_down_recovery(clp);
3365         }
3366         do_renew_lease(clp, timestamp);
3367 }
3368
3369 static const struct rpc_call_ops nfs4_renew_ops = {
3370         .rpc_call_done = nfs4_renew_done,
3371         .rpc_release = nfs4_renew_release,
3372 };
3373
3374 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3375 {
3376         struct rpc_message msg = {
3377                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3378                 .rpc_argp       = clp,
3379                 .rpc_cred       = cred,
3380         };
3381         struct nfs4_renewdata *data;
3382
3383         if (renew_flags == 0)
3384                 return 0;
3385         if (!atomic_inc_not_zero(&clp->cl_count))
3386                 return -EIO;
3387         data = kmalloc(sizeof(*data), GFP_NOFS);
3388         if (data == NULL)
3389                 return -ENOMEM;
3390         data->client = clp;
3391         data->timestamp = jiffies;
3392         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3393                         &nfs4_renew_ops, data);
3394 }
3395
3396 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3397 {
3398         struct rpc_message msg = {
3399                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3400                 .rpc_argp       = clp,
3401                 .rpc_cred       = cred,
3402         };
3403         unsigned long now = jiffies;
3404         int status;
3405
3406         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3407         if (status < 0)
3408                 return status;
3409         do_renew_lease(clp, now);
3410         return 0;
3411 }
3412
3413 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3414 {
3415         return (server->caps & NFS_CAP_ACLS)
3416                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3417                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3418 }
3419
3420 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3421  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3422  * the stack.
3423  */
3424 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3425
3426 static void buf_to_pages(const void *buf, size_t buflen,
3427                 struct page **pages, unsigned int *pgbase)
3428 {
3429         const void *p = buf;
3430
3431         *pgbase = offset_in_page(buf);
3432         p -= *pgbase;
3433         while (p < buf + buflen) {
3434                 *(pages++) = virt_to_page(p);
3435                 p += PAGE_CACHE_SIZE;
3436         }
3437 }
3438
3439 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3440                 struct page **pages, unsigned int *pgbase)
3441 {
3442         struct page *newpage, **spages;
3443         int rc = 0;
3444         size_t len;
3445         spages = pages;
3446
3447         do {
3448                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3449                 newpage = alloc_page(GFP_KERNEL);
3450
3451                 if (newpage == NULL)
3452                         goto unwind;
3453                 memcpy(page_address(newpage), buf, len);
3454                 buf += len;
3455                 buflen -= len;
3456                 *pages++ = newpage;
3457                 rc++;
3458         } while (buflen != 0);
3459
3460         return rc;
3461
3462 unwind:
3463         for(; rc > 0; rc--)
3464                 __free_page(spages[rc-1]);
3465         return -ENOMEM;
3466 }
3467
3468 struct nfs4_cached_acl {
3469         int cached;
3470         size_t len;
3471         char data[0];
3472 };
3473
3474 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3475 {
3476         struct nfs_inode *nfsi = NFS_I(inode);
3477
3478         spin_lock(&inode->i_lock);
3479         kfree(nfsi->nfs4_acl);
3480         nfsi->nfs4_acl = acl;
3481         spin_unlock(&inode->i_lock);
3482 }
3483
3484 static void nfs4_zap_acl_attr(struct inode *inode)
3485 {
3486         nfs4_set_cached_acl(inode, NULL);
3487 }
3488
3489 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3490 {
3491         struct nfs_inode *nfsi = NFS_I(inode);
3492         struct nfs4_cached_acl *acl;
3493         int ret = -ENOENT;
3494
3495         spin_lock(&inode->i_lock);
3496         acl = nfsi->nfs4_acl;
3497         if (acl == NULL)
3498                 goto out;
3499         if (buf == NULL) /* user is just asking for length */
3500                 goto out_len;
3501         if (acl->cached == 0)
3502                 goto out;
3503         ret = -ERANGE; /* see getxattr(2) man page */
3504         if (acl->len > buflen)
3505                 goto out;
3506         memcpy(buf, acl->data, acl->len);
3507 out_len:
3508         ret = acl->len;
3509 out:
3510         spin_unlock(&inode->i_lock);
3511         return ret;
3512 }
3513
3514 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3515 {
3516         struct nfs4_cached_acl *acl;
3517
3518         if (buf && acl_len <= PAGE_SIZE) {
3519                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3520                 if (acl == NULL)
3521                         goto out;
3522                 acl->cached = 1;
3523                 memcpy(acl->data, buf, acl_len);
3524         } else {
3525                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3526                 if (acl == NULL)
3527                         goto out;
3528                 acl->cached = 0;
3529         }
3530         acl->len = acl_len;
3531 out:
3532         nfs4_set_cached_acl(inode, acl);
3533 }
3534
3535 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3536 {
3537         struct page *pages[NFS4ACL_MAXPAGES];
3538         struct nfs_getaclargs args = {
3539                 .fh = NFS_FH(inode),
3540                 .acl_pages = pages,
3541                 .acl_len = buflen,
3542         };
3543         struct nfs_getaclres res = {
3544                 .acl_len = buflen,
3545         };
3546         void *resp_buf;
3547         struct rpc_message msg = {
3548                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3549                 .rpc_argp = &args,
3550                 .rpc_resp = &res,
3551         };
3552         struct page *localpage = NULL;
3553         int ret;
3554
3555         if (buflen < PAGE_SIZE) {
3556                 /* As long as we're doing a round trip to the server anyway,
3557                  * let's be prepared for a page of acl data. */
3558                 localpage = alloc_page(GFP_KERNEL);
3559                 resp_buf = page_address(localpage);
3560                 if (localpage == NULL)
3561                         return -ENOMEM;
3562                 args.acl_pages[0] = localpage;
3563                 args.acl_pgbase = 0;
3564                 args.acl_len = PAGE_SIZE;
3565         } else {
3566                 resp_buf = buf;
3567                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3568         }
3569         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3570         if (ret)
3571                 goto out_free;
3572         if (res.acl_len > args.acl_len)
3573                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3574         else
3575                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3576         if (buf) {
3577                 ret = -ERANGE;
3578                 if (res.acl_len > buflen)
3579                         goto out_free;
3580                 if (localpage)
3581                         memcpy(buf, resp_buf, res.acl_len);
3582         }
3583         ret = res.acl_len;
3584 out_free:
3585         if (localpage)
3586                 __free_page(localpage);
3587         return ret;
3588 }
3589
3590 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3591 {
3592         struct nfs4_exception exception = { };
3593         ssize_t ret;
3594         do {
3595                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3596                 if (ret >= 0)
3597                         break;
3598                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3599         } while (exception.retry);
3600         return ret;
3601 }
3602
3603 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3604 {
3605         struct nfs_server *server = NFS_SERVER(inode);
3606         int ret;
3607
3608         if (!nfs4_server_supports_acls(server))
3609                 return -EOPNOTSUPP;
3610         ret = nfs_revalidate_inode(server, inode);
3611         if (ret < 0)
3612                 return ret;
3613         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3614                 nfs_zap_acl_cache(inode);
3615         ret = nfs4_read_cached_acl(inode, buf, buflen);
3616         if (ret != -ENOENT)
3617                 return ret;
3618         return nfs4_get_acl_uncached(inode, buf, buflen);
3619 }
3620
3621 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3622 {
3623         struct nfs_server *server = NFS_SERVER(inode);
3624         struct page *pages[NFS4ACL_MAXPAGES];
3625         struct nfs_setaclargs arg = {
3626                 .fh             = NFS_FH(inode),
3627                 .acl_pages      = pages,
3628                 .acl_len        = buflen,
3629         };
3630         struct nfs_setaclres res;
3631         struct rpc_message msg = {
3632                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3633                 .rpc_argp       = &arg,
3634                 .rpc_resp       = &res,
3635         };
3636         int ret, i;
3637
3638         if (!nfs4_server_supports_acls(server))
3639                 return -EOPNOTSUPP;
3640         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3641         if (i < 0)
3642                 return i;
3643         nfs_inode_return_delegation(inode);
3644         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3645
3646         /*
3647          * Free each page after tx, so the only ref left is
3648          * held by the network stack
3649          */
3650         for (; i > 0; i--)
3651                 put_page(pages[i-1]);
3652
3653         /*
3654          * Acl update can result in inode attribute update.
3655          * so mark the attribute cache invalid.
3656          */
3657         spin_lock(&inode->i_lock);
3658         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3659         spin_unlock(&inode->i_lock);
3660         nfs_access_zap_cache(inode);
3661         nfs_zap_acl_cache(inode);
3662         return ret;
3663 }
3664
3665 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3666 {
3667         struct nfs4_exception exception = { };
3668         int err;
3669         do {
3670                 err = nfs4_handle_exception(NFS_SERVER(inode),
3671                                 __nfs4_proc_set_acl(inode, buf, buflen),
3672                                 &exception);
3673         } while (exception.retry);
3674         return err;
3675 }
3676
3677 static int
3678 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3679 {
3680         struct nfs_client *clp = server->nfs_client;
3681
3682         if (task->tk_status >= 0)
3683                 return 0;
3684         switch(task->tk_status) {
3685                 case -NFS4ERR_ADMIN_REVOKED:
3686                 case -NFS4ERR_BAD_STATEID:
3687                 case -NFS4ERR_OPENMODE:
3688                         if (state == NULL)
3689                                 break;
3690                         nfs4_schedule_stateid_recovery(server, state);
3691                         goto wait_on_recovery;
3692                 case -NFS4ERR_EXPIRED:
3693                         if (state != NULL)
3694                                 nfs4_schedule_stateid_recovery(server, state);
3695                 case -NFS4ERR_STALE_STATEID:
3696                 case -NFS4ERR_STALE_CLIENTID:
3697                         nfs4_schedule_lease_recovery(clp);
3698                         goto wait_on_recovery;
3699 #if defined(CONFIG_NFS_V4_1)
3700                 case -NFS4ERR_BADSESSION:
3701                 case -NFS4ERR_BADSLOT:
3702                 case -NFS4ERR_BAD_HIGH_SLOT:
3703                 case -NFS4ERR_DEADSESSION:
3704                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3705                 case -NFS4ERR_SEQ_FALSE_RETRY:
3706                 case -NFS4ERR_SEQ_MISORDERED:
3707                         dprintk("%s ERROR %d, Reset session\n", __func__,
3708                                 task->tk_status);
3709                         nfs4_schedule_session_recovery(clp->cl_session);
3710                         task->tk_status = 0;
3711                         return -EAGAIN;
3712 #endif /* CONFIG_NFS_V4_1 */
3713                 case -NFS4ERR_DELAY:
3714                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3715                 case -NFS4ERR_GRACE:
3716                 case -EKEYEXPIRED:
3717                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3718                         task->tk_status = 0;
3719                         return -EAGAIN;
3720                 case -NFS4ERR_RETRY_UNCACHED_REP:
3721                 case -NFS4ERR_OLD_STATEID:
3722                         task->tk_status = 0;
3723                         return -EAGAIN;
3724         }
3725         task->tk_status = nfs4_map_errors(task->tk_status);
3726         return 0;
3727 wait_on_recovery:
3728         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3729         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3730                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3731         task->tk_status = 0;
3732         return -EAGAIN;
3733 }
3734
3735 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3736                 unsigned short port, struct rpc_cred *cred,
3737                 struct nfs4_setclientid_res *res)
3738 {
3739         nfs4_verifier sc_verifier;
3740         struct nfs4_setclientid setclientid = {
3741                 .sc_verifier = &sc_verifier,
3742                 .sc_prog = program,
3743                 .sc_cb_ident = clp->cl_cb_ident,
3744         };
3745         struct rpc_message msg = {
3746                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3747                 .rpc_argp = &setclientid,
3748                 .rpc_resp = res,
3749                 .rpc_cred = cred,
3750         };
3751         __be32 *p;
3752         int loop = 0;
3753         int status;
3754
3755         p = (__be32*)sc_verifier.data;
3756         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3757         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3758
3759         for(;;) {
3760                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3761                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3762                                 clp->cl_ipaddr,
3763                                 rpc_peeraddr2str(clp->cl_rpcclient,
3764                                                         RPC_DISPLAY_ADDR),
3765                                 rpc_peeraddr2str(clp->cl_rpcclient,
3766                                                         RPC_DISPLAY_PROTO),
3767                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3768                                 clp->cl_id_uniquifier);
3769                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3770                                 sizeof(setclientid.sc_netid),
3771                                 rpc_peeraddr2str(clp->cl_rpcclient,
3772                                                         RPC_DISPLAY_NETID));
3773                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3774                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3775                                 clp->cl_ipaddr, port >> 8, port & 255);
3776
3777                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3778                 if (status != -NFS4ERR_CLID_INUSE)
3779                         break;
3780                 if (loop != 0) {
3781                         ++clp->cl_id_uniquifier;
3782                         break;
3783                 }
3784                 ++loop;
3785                 ssleep(clp->cl_lease_time / HZ + 1);
3786         }
3787         return status;
3788 }
3789
3790 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3791                 struct nfs4_setclientid_res *arg,
3792                 struct rpc_cred *cred)
3793 {
3794         struct nfs_fsinfo fsinfo;
3795         struct rpc_message msg = {
3796                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3797                 .rpc_argp = arg,
3798                 .rpc_resp = &fsinfo,
3799                 .rpc_cred = cred,
3800         };
3801         unsigned long now;
3802         int status;
3803
3804         now = jiffies;
3805         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3806         if (status == 0) {
3807                 spin_lock(&clp->cl_lock);
3808                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3809                 clp->cl_last_renewal = now;
3810                 spin_unlock(&clp->cl_lock);
3811         }
3812         return status;
3813 }
3814
3815 struct nfs4_delegreturndata {
3816         struct nfs4_delegreturnargs args;
3817         struct nfs4_delegreturnres res;
3818         struct nfs_fh fh;
3819         nfs4_stateid stateid;
3820         unsigned long timestamp;
3821         struct nfs_fattr fattr;
3822         int rpc_status;
3823 };
3824
3825 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3826 {
3827         struct nfs4_delegreturndata *data = calldata;
3828
3829         if (!nfs4_sequence_done(task, &data->res.seq_res))
3830                 return;
3831
3832         switch (task->tk_status) {
3833         case -NFS4ERR_STALE_STATEID:
3834         case -NFS4ERR_EXPIRED:
3835         case 0:
3836                 renew_lease(data->res.server, data->timestamp);
3837                 break;
3838         default:
3839                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3840                                 -EAGAIN) {
3841                         rpc_restart_call_prepare(task);
3842                         return;
3843                 }
3844         }
3845         data->rpc_status = task->tk_status;
3846 }
3847
3848 static void nfs4_delegreturn_release(void *calldata)
3849 {
3850         kfree(calldata);
3851 }
3852
3853 #if defined(CONFIG_NFS_V4_1)
3854 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3855 {
3856         struct nfs4_delegreturndata *d_data;
3857
3858         d_data = (struct nfs4_delegreturndata *)data;
3859
3860         if (nfs4_setup_sequence(d_data->res.server,
3861                                 &d_data->args.seq_args,
3862                                 &d_data->res.seq_res, 1, task))
3863                 return;
3864         rpc_call_start(task);
3865 }
3866 #endif /* CONFIG_NFS_V4_1 */
3867
3868 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3869 #if defined(CONFIG_NFS_V4_1)
3870         .rpc_call_prepare = nfs4_delegreturn_prepare,
3871 #endif /* CONFIG_NFS_V4_1 */
3872         .rpc_call_done = nfs4_delegreturn_done,
3873         .rpc_release = nfs4_delegreturn_release,
3874 };
3875
3876 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3877 {
3878         struct nfs4_delegreturndata *data;
3879         struct nfs_server *server = NFS_SERVER(inode);
3880         struct rpc_task *task;
3881         struct rpc_message msg = {
3882                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3883                 .rpc_cred = cred,
3884         };
3885         struct rpc_task_setup task_setup_data = {
3886                 .rpc_client = server->client,
3887                 .rpc_message = &msg,
3888                 .callback_ops = &nfs4_delegreturn_ops,
3889                 .flags = RPC_TASK_ASYNC,
3890         };
3891         int status = 0;
3892
3893         data = kzalloc(sizeof(*data), GFP_NOFS);
3894         if (data == NULL)
3895                 return -ENOMEM;
3896         data->args.fhandle = &data->fh;
3897         data->args.stateid = &data->stateid;
3898         data->args.bitmask = server->attr_bitmask;
3899         nfs_copy_fh(&data->fh, NFS_FH(inode));
3900         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3901         data->res.fattr = &data->fattr;
3902         data->res.server = server;
3903         nfs_fattr_init(data->res.fattr);
3904         data->timestamp = jiffies;
3905         data->rpc_status = 0;
3906
3907         task_setup_data.callback_data = data;
3908         msg.rpc_argp = &data->args;
3909         msg.rpc_resp = &data->res;
3910         task = rpc_run_task(&task_setup_data);
3911         if (IS_ERR(task))
3912                 return PTR_ERR(task);
3913         if (!issync)
3914                 goto out;
3915         status = nfs4_wait_for_completion_rpc_task(task);
3916         if (status != 0)
3917                 goto out;
3918         status = data->rpc_status;
3919         if (status != 0)
3920                 goto out;
3921         nfs_refresh_inode(inode, &data->fattr);
3922 out:
3923         rpc_put_task(task);
3924         return status;
3925 }
3926
3927 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3928 {
3929         struct nfs_server *server = NFS_SERVER(inode);
3930         struct nfs4_exception exception = { };
3931         int err;
3932         do {
3933                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3934                 switch (err) {
3935                         case -NFS4ERR_STALE_STATEID:
3936                         case -NFS4ERR_EXPIRED:
3937                         case 0:
3938                                 return 0;
3939                 }
3940                 err = nfs4_handle_exception(server, err, &exception);
3941         } while (exception.retry);
3942         return err;
3943 }
3944
3945 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3946 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3947
3948 /*
3949  * sleep, with exponential backoff, and retry the LOCK operation.
3950  */
3951 static unsigned long
3952 nfs4_set_lock_task_retry(unsigned long timeout)
3953 {
3954         freezable_schedule_timeout_killable(timeout);
3955         timeout <<= 1;
3956         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3957                 return NFS4_LOCK_MAXTIMEOUT;
3958         return timeout;
3959 }
3960
3961 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3962 {
3963         struct inode *inode = state->inode;
3964         struct nfs_server *server = NFS_SERVER(inode);
3965         struct nfs_client *clp = server->nfs_client;
3966         struct nfs_lockt_args arg = {
3967                 .fh = NFS_FH(inode),
3968                 .fl = request,
3969         };
3970         struct nfs_lockt_res res = {
3971                 .denied = request,
3972         };
3973         struct rpc_message msg = {
3974                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3975                 .rpc_argp       = &arg,
3976                 .rpc_resp       = &res,
3977                 .rpc_cred       = state->owner->so_cred,
3978         };
3979         struct nfs4_lock_state *lsp;
3980         int status;
3981
3982         arg.lock_owner.clientid = clp->cl_clientid;
3983         status = nfs4_set_lock_state(state, request);
3984         if (status != 0)
3985                 goto out;
3986         lsp = request->fl_u.nfs4_fl.owner;
3987         arg.lock_owner.id = lsp->ls_id.id;
3988         arg.lock_owner.s_dev = server->s_dev;
3989         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3990         switch (status) {
3991                 case 0:
3992                         request->fl_type = F_UNLCK;
3993                         break;
3994                 case -NFS4ERR_DENIED:
3995                         status = 0;
3996         }
3997         request->fl_ops->fl_release_private(request);
3998 out:
3999         return status;
4000 }
4001
4002 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4003 {
4004         struct nfs4_exception exception = { };
4005         int err;
4006
4007         do {
4008                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4009                                 _nfs4_proc_getlk(state, cmd, request),
4010                                 &exception);
4011         } while (exception.retry);
4012         return err;
4013 }
4014
4015 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4016 {
4017         int res = 0;
4018         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4019                 case FL_POSIX:
4020                         res = posix_lock_file_wait(file, fl);
4021                         break;
4022                 case FL_FLOCK:
4023                         res = flock_lock_file_wait(file, fl);
4024                         break;
4025                 default:
4026                         BUG();
4027         }
4028         return res;
4029 }
4030
4031 struct nfs4_unlockdata {
4032         struct nfs_locku_args arg;
4033         struct nfs_locku_res res;
4034         struct nfs4_lock_state *lsp;
4035         struct nfs_open_context *ctx;
4036         struct file_lock fl;
4037         const struct nfs_server *server;
4038         unsigned long timestamp;
4039 };
4040
4041 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4042                 struct nfs_open_context *ctx,
4043                 struct nfs4_lock_state *lsp,
4044                 struct nfs_seqid *seqid)
4045 {
4046         struct nfs4_unlockdata *p;
4047         struct inode *inode = lsp->ls_state->inode;
4048
4049         p = kzalloc(sizeof(*p), GFP_NOFS);
4050         if (p == NULL)
4051                 return NULL;
4052         p->arg.fh = NFS_FH(inode);
4053         p->arg.fl = &p->fl;
4054         p->arg.seqid = seqid;
4055         p->res.seqid = seqid;
4056         p->arg.stateid = &lsp->ls_stateid;
4057         p->lsp = lsp;
4058         atomic_inc(&lsp->ls_count);
4059         /* Ensure we don't close file until we're done freeing locks! */
4060         p->ctx = get_nfs_open_context(ctx);
4061         memcpy(&p->fl, fl, sizeof(p->fl));
4062         p->server = NFS_SERVER(inode);
4063         return p;
4064 }
4065
4066 static void nfs4_locku_release_calldata(void *data)
4067 {
4068         struct nfs4_unlockdata *calldata = data;
4069         nfs_free_seqid(calldata->arg.seqid);
4070         nfs4_put_lock_state(calldata->lsp);
4071         put_nfs_open_context(calldata->ctx);
4072         kfree(calldata);
4073 }
4074
4075 static void nfs4_locku_done(struct rpc_task *task, void *data)
4076 {
4077         struct nfs4_unlockdata *calldata = data;
4078
4079         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4080                 return;
4081         switch (task->tk_status) {
4082                 case 0:
4083                         memcpy(calldata->lsp->ls_stateid.data,
4084                                         calldata->res.stateid.data,
4085                                         sizeof(calldata->lsp->ls_stateid.data));
4086                         renew_lease(calldata->server, calldata->timestamp);
4087                         break;
4088                 case -NFS4ERR_BAD_STATEID:
4089                 case -NFS4ERR_OLD_STATEID:
4090                 case -NFS4ERR_STALE_STATEID:
4091                 case -NFS4ERR_EXPIRED:
4092                         break;
4093                 default:
4094                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4095                                 rpc_restart_call_prepare(task);
4096         }
4097 }
4098
4099 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4100 {
4101         struct nfs4_unlockdata *calldata = data;
4102
4103         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4104                 return;
4105         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4106                 /* Note: exit _without_ running nfs4_locku_done */
4107                 task->tk_action = NULL;
4108                 return;
4109         }
4110         calldata->timestamp = jiffies;
4111         if (nfs4_setup_sequence(calldata->server,
4112                                 &calldata->arg.seq_args,
4113                                 &calldata->res.seq_res, 1, task))
4114                 return;
4115         rpc_call_start(task);
4116 }
4117
4118 static const struct rpc_call_ops nfs4_locku_ops = {
4119         .rpc_call_prepare = nfs4_locku_prepare,
4120         .rpc_call_done = nfs4_locku_done,
4121         .rpc_release = nfs4_locku_release_calldata,
4122 };
4123
4124 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4125                 struct nfs_open_context *ctx,
4126                 struct nfs4_lock_state *lsp,
4127                 struct nfs_seqid *seqid)
4128 {
4129         struct nfs4_unlockdata *data;
4130         struct rpc_message msg = {
4131                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4132                 .rpc_cred = ctx->cred,
4133         };
4134         struct rpc_task_setup task_setup_data = {
4135                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4136                 .rpc_message = &msg,
4137                 .callback_ops = &nfs4_locku_ops,
4138                 .workqueue = nfsiod_workqueue,
4139                 .flags = RPC_TASK_ASYNC,
4140         };
4141
4142         /* Ensure this is an unlock - when canceling a lock, the
4143          * canceled lock is passed in, and it won't be an unlock.
4144          */
4145         fl->fl_type = F_UNLCK;
4146
4147         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4148         if (data == NULL) {
4149                 nfs_free_seqid(seqid);
4150                 return ERR_PTR(-ENOMEM);
4151         }
4152
4153         msg.rpc_argp = &data->arg;
4154         msg.rpc_resp = &data->res;
4155         task_setup_data.callback_data = data;
4156         return rpc_run_task(&task_setup_data);
4157 }
4158
4159 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4160 {
4161         struct nfs_inode *nfsi = NFS_I(state->inode);
4162         struct nfs_seqid *seqid;
4163         struct nfs4_lock_state *lsp;
4164         struct rpc_task *task;
4165         int status = 0;
4166         unsigned char fl_flags = request->fl_flags;
4167
4168         status = nfs4_set_lock_state(state, request);
4169         /* Unlock _before_ we do the RPC call */
4170         request->fl_flags |= FL_EXISTS;
4171         down_read(&nfsi->rwsem);
4172         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4173                 up_read(&nfsi->rwsem);
4174                 goto out;
4175         }
4176         up_read(&nfsi->rwsem);
4177         if (status != 0)
4178                 goto out;
4179         /* Is this a delegated lock? */
4180         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4181                 goto out;
4182         lsp = request->fl_u.nfs4_fl.owner;
4183         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4184         status = -ENOMEM;
4185         if (seqid == NULL)
4186                 goto out;
4187         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4188         status = PTR_ERR(task);
4189         if (IS_ERR(task))
4190                 goto out;
4191         status = nfs4_wait_for_completion_rpc_task(task);
4192         rpc_put_task(task);
4193 out:
4194         request->fl_flags = fl_flags;
4195         return status;
4196 }
4197
4198 struct nfs4_lockdata {
4199         struct nfs_lock_args arg;
4200         struct nfs_lock_res res;
4201         struct nfs4_lock_state *lsp;
4202         struct nfs_open_context *ctx;
4203         struct file_lock fl;
4204         unsigned long timestamp;
4205         int rpc_status;
4206         int cancelled;
4207         struct nfs_server *server;
4208 };
4209
4210 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4211                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4212                 gfp_t gfp_mask)
4213 {
4214         struct nfs4_lockdata *p;
4215         struct inode *inode = lsp->ls_state->inode;
4216         struct nfs_server *server = NFS_SERVER(inode);
4217
4218         p = kzalloc(sizeof(*p), gfp_mask);
4219         if (p == NULL)
4220                 return NULL;
4221
4222         p->arg.fh = NFS_FH(inode);
4223         p->arg.fl = &p->fl;
4224         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4225         if (p->arg.open_seqid == NULL)
4226                 goto out_free;
4227         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4228         if (p->arg.lock_seqid == NULL)
4229                 goto out_free_seqid;
4230         p->arg.lock_stateid = &lsp->ls_stateid;
4231         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4232         p->arg.lock_owner.id = lsp->ls_id.id;
4233         p->arg.lock_owner.s_dev = server->s_dev;
4234         p->res.lock_seqid = p->arg.lock_seqid;
4235         p->lsp = lsp;
4236         p->server = server;
4237         atomic_inc(&lsp->ls_count);
4238         p->ctx = get_nfs_open_context(ctx);
4239         memcpy(&p->fl, fl, sizeof(p->fl));
4240         return p;
4241 out_free_seqid:
4242         nfs_free_seqid(p->arg.open_seqid);
4243 out_free:
4244         kfree(p);
4245         return NULL;
4246 }
4247
4248 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4249 {
4250         struct nfs4_lockdata *data = calldata;
4251         struct nfs4_state *state = data->lsp->ls_state;
4252
4253         dprintk("%s: begin!\n", __func__);
4254         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4255                 return;
4256         /* Do we need to do an open_to_lock_owner? */
4257         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4258                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4259                         return;
4260                 data->arg.open_stateid = &state->stateid;
4261                 data->arg.new_lock_owner = 1;
4262                 data->res.open_seqid = data->arg.open_seqid;
4263         } else
4264                 data->arg.new_lock_owner = 0;
4265         data->timestamp = jiffies;
4266         if (nfs4_setup_sequence(data->server,
4267                                 &data->arg.seq_args,
4268                                 &data->res.seq_res, 1, task))
4269                 return;
4270         rpc_call_start(task);
4271         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4272 }
4273
4274 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4275 {
4276         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4277         nfs4_lock_prepare(task, calldata);
4278 }
4279
4280 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4281 {
4282         struct nfs4_lockdata *data = calldata;
4283
4284         dprintk("%s: begin!\n", __func__);
4285
4286         if (!nfs4_sequence_done(task, &data->res.seq_res))
4287                 return;
4288
4289         data->rpc_status = task->tk_status;
4290         if (data->arg.new_lock_owner != 0) {
4291                 if (data->rpc_status == 0)
4292                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4293                 else
4294                         goto out;
4295         }
4296         if (data->rpc_status == 0) {
4297                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4298                                         sizeof(data->lsp->ls_stateid.data));
4299                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4300                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4301         }
4302 out:
4303         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4304 }
4305
4306 static void nfs4_lock_release(void *calldata)
4307 {
4308         struct nfs4_lockdata *data = calldata;
4309
4310         dprintk("%s: begin!\n", __func__);
4311         nfs_free_seqid(data->arg.open_seqid);
4312         if (data->cancelled != 0) {
4313                 struct rpc_task *task;
4314                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4315                                 data->arg.lock_seqid);
4316                 if (!IS_ERR(task))
4317                         rpc_put_task_async(task);
4318                 dprintk("%s: cancelling lock!\n", __func__);
4319         } else
4320                 nfs_free_seqid(data->arg.lock_seqid);
4321         nfs4_put_lock_state(data->lsp);
4322         put_nfs_open_context(data->ctx);
4323         kfree(data);
4324         dprintk("%s: done!\n", __func__);
4325 }
4326
4327 static const struct rpc_call_ops nfs4_lock_ops = {
4328         .rpc_call_prepare = nfs4_lock_prepare,
4329         .rpc_call_done = nfs4_lock_done,
4330         .rpc_release = nfs4_lock_release,
4331 };
4332
4333 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4334         .rpc_call_prepare = nfs4_recover_lock_prepare,
4335         .rpc_call_done = nfs4_lock_done,
4336         .rpc_release = nfs4_lock_release,
4337 };
4338
4339 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4340 {
4341         switch (error) {
4342         case -NFS4ERR_ADMIN_REVOKED:
4343         case -NFS4ERR_BAD_STATEID:
4344                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4345                 if (new_lock_owner != 0 ||
4346                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4347                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4348                 break;
4349         case -NFS4ERR_STALE_STATEID:
4350                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4351         case -NFS4ERR_EXPIRED:
4352                 nfs4_schedule_lease_recovery(server->nfs_client);
4353         };
4354 }
4355
4356 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4357 {
4358         struct nfs4_lockdata *data;
4359         struct rpc_task *task;
4360         struct rpc_message msg = {
4361                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4362                 .rpc_cred = state->owner->so_cred,
4363         };
4364         struct rpc_task_setup task_setup_data = {
4365                 .rpc_client = NFS_CLIENT(state->inode),
4366                 .rpc_message = &msg,
4367                 .callback_ops = &nfs4_lock_ops,
4368                 .workqueue = nfsiod_workqueue,
4369                 .flags = RPC_TASK_ASYNC,
4370         };
4371         int ret;
4372
4373         dprintk("%s: begin!\n", __func__);
4374         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4375                         fl->fl_u.nfs4_fl.owner,
4376                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4377         if (data == NULL)
4378                 return -ENOMEM;
4379         if (IS_SETLKW(cmd))
4380                 data->arg.block = 1;
4381         if (recovery_type > NFS_LOCK_NEW) {
4382                 if (recovery_type == NFS_LOCK_RECLAIM)
4383                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4384                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4385         }
4386         msg.rpc_argp = &data->arg;
4387         msg.rpc_resp = &data->res;
4388         task_setup_data.callback_data = data;
4389         task = rpc_run_task(&task_setup_data);
4390         if (IS_ERR(task))
4391                 return PTR_ERR(task);
4392         ret = nfs4_wait_for_completion_rpc_task(task);
4393         if (ret == 0) {
4394                 ret = data->rpc_status;
4395                 if (ret)
4396                         nfs4_handle_setlk_error(data->server, data->lsp,
4397                                         data->arg.new_lock_owner, ret);
4398         } else
4399                 data->cancelled = 1;
4400         rpc_put_task(task);
4401         dprintk("%s: done, ret = %d!\n", __func__, ret);
4402         return ret;
4403 }
4404
4405 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4406 {
4407         struct nfs_server *server = NFS_SERVER(state->inode);
4408         struct nfs4_exception exception = { };
4409         int err;
4410
4411         do {
4412                 /* Cache the lock if possible... */
4413                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4414                         return 0;
4415                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4416                 if (err != -NFS4ERR_DELAY)
4417                         break;
4418                 nfs4_handle_exception(server, err, &exception);
4419         } while (exception.retry);
4420         return err;
4421 }
4422
4423 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4424 {
4425         struct nfs_server *server = NFS_SERVER(state->inode);
4426         struct nfs4_exception exception = { };
4427         int err;
4428
4429         err = nfs4_set_lock_state(state, request);
4430         if (err != 0)
4431                 return err;
4432         do {
4433                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4434                         return 0;
4435                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4436                 switch (err) {
4437                 default:
4438                         goto out;
4439                 case -NFS4ERR_GRACE:
4440                 case -NFS4ERR_DELAY:
4441                         nfs4_handle_exception(server, err, &exception);
4442                         err = 0;
4443                 }
4444         } while (exception.retry);
4445 out:
4446         return err;
4447 }
4448
4449 #if defined(CONFIG_NFS_V4_1)
4450 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4451 {
4452         int status;
4453         struct nfs_server *server = NFS_SERVER(state->inode);
4454
4455         status = nfs41_test_stateid(server, state);
4456         if (status == NFS_OK)
4457                 return 0;
4458         nfs41_free_stateid(server, state);
4459         return nfs4_lock_expired(state, request);
4460 }
4461 #endif
4462
4463 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4464 {
4465         struct nfs_inode *nfsi = NFS_I(state->inode);
4466         unsigned char fl_flags = request->fl_flags;
4467         int status = -ENOLCK;
4468
4469         if ((fl_flags & FL_POSIX) &&
4470                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4471                 goto out;
4472         /* Is this a delegated open? */
4473         status = nfs4_set_lock_state(state, request);
4474         if (status != 0)
4475                 goto out;
4476         request->fl_flags |= FL_ACCESS;
4477         status = do_vfs_lock(request->fl_file, request);
4478         if (status < 0)
4479                 goto out;
4480         down_read(&nfsi->rwsem);
4481         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4482                 /* Yes: cache locks! */
4483                 /* ...but avoid races with delegation recall... */
4484                 request->fl_flags = fl_flags & ~FL_SLEEP;
4485                 status = do_vfs_lock(request->fl_file, request);
4486                 goto out_unlock;
4487         }
4488         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4489         if (status != 0)
4490                 goto out_unlock;
4491         /* Note: we always want to sleep here! */
4492         request->fl_flags = fl_flags | FL_SLEEP;
4493         if (do_vfs_lock(request->fl_file, request) < 0)
4494                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4495 out_unlock:
4496         up_read(&nfsi->rwsem);
4497 out:
4498         request->fl_flags = fl_flags;
4499         return status;
4500 }
4501
4502 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4503 {
4504         struct nfs4_exception exception = { };
4505         int err;
4506
4507         do {
4508                 err = _nfs4_proc_setlk(state, cmd, request);
4509                 if (err == -NFS4ERR_DENIED)
4510                         err = -EAGAIN;
4511                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4512                                 err, &exception);
4513         } while (exception.retry);
4514         return err;
4515 }
4516
4517 static int
4518 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4519 {
4520         struct nfs_open_context *ctx;
4521         struct nfs4_state *state;
4522         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4523         int status;
4524
4525         /* verify open state */
4526         ctx = nfs_file_open_context(filp);
4527         state = ctx->state;
4528
4529         if (request->fl_start < 0 || request->fl_end < 0)
4530                 return -EINVAL;
4531
4532         if (IS_GETLK(cmd)) {
4533                 if (state != NULL)
4534                         return nfs4_proc_getlk(state, F_GETLK, request);
4535                 return 0;
4536         }
4537
4538         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4539                 return -EINVAL;
4540
4541         if (request->fl_type == F_UNLCK) {
4542                 if (state != NULL)
4543                         return nfs4_proc_unlck(state, cmd, request);
4544                 return 0;
4545         }
4546
4547         if (state == NULL)
4548                 return -ENOLCK;
4549         do {
4550                 status = nfs4_proc_setlk(state, cmd, request);
4551                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4552                         break;
4553                 timeout = nfs4_set_lock_task_retry(timeout);
4554                 status = -ERESTARTSYS;
4555                 if (signalled())
4556                         break;
4557         } while(status < 0);
4558         return status;
4559 }
4560
4561 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4562 {
4563         struct nfs_server *server = NFS_SERVER(state->inode);
4564         struct nfs4_exception exception = { };
4565         int err;
4566
4567         err = nfs4_set_lock_state(state, fl);
4568         if (err != 0)
4569                 goto out;
4570         do {
4571                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4572                 switch (err) {
4573                         default:
4574                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4575                                                 __func__, err);
4576                         case 0:
4577                         case -ESTALE:
4578                                 goto out;
4579                         case -NFS4ERR_EXPIRED:
4580                                 nfs4_schedule_stateid_recovery(server, state);
4581                         case -NFS4ERR_STALE_CLIENTID:
4582                         case -NFS4ERR_STALE_STATEID:
4583                                 nfs4_schedule_lease_recovery(server->nfs_client);
4584                                 goto out;
4585                         case -NFS4ERR_BADSESSION:
4586                         case -NFS4ERR_BADSLOT:
4587                         case -NFS4ERR_BAD_HIGH_SLOT:
4588                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4589                         case -NFS4ERR_DEADSESSION:
4590                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4591                                 goto out;
4592                         case -ERESTARTSYS:
4593                                 /*
4594                                  * The show must go on: exit, but mark the
4595                                  * stateid as needing recovery.
4596                                  */
4597                         case -NFS4ERR_ADMIN_REVOKED:
4598                         case -NFS4ERR_BAD_STATEID:
4599                         case -NFS4ERR_OPENMODE:
4600                                 nfs4_schedule_stateid_recovery(server, state);
4601                                 err = 0;
4602                                 goto out;
4603                         case -EKEYEXPIRED:
4604                                 /*
4605                                  * User RPCSEC_GSS context has expired.
4606                                  * We cannot recover this stateid now, so
4607                                  * skip it and allow recovery thread to
4608                                  * proceed.
4609                                  */
4610                                 err = 0;
4611                                 goto out;
4612                         case -ENOMEM:
4613                         case -NFS4ERR_DENIED:
4614                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4615                                 err = 0;
4616                                 goto out;
4617                         case -NFS4ERR_DELAY:
4618                                 break;
4619                 }
4620                 err = nfs4_handle_exception(server, err, &exception);
4621         } while (exception.retry);
4622 out:
4623         return err;
4624 }
4625
4626 static void nfs4_release_lockowner_release(void *calldata)
4627 {
4628         kfree(calldata);
4629 }
4630
4631 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4632         .rpc_release = nfs4_release_lockowner_release,
4633 };
4634
4635 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4636 {
4637         struct nfs_server *server = lsp->ls_state->owner->so_server;
4638         struct nfs_release_lockowner_args *args;
4639         struct rpc_message msg = {
4640                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4641         };
4642
4643         if (server->nfs_client->cl_mvops->minor_version != 0)
4644                 return;
4645         args = kmalloc(sizeof(*args), GFP_NOFS);
4646         if (!args)
4647                 return;
4648         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4649         args->lock_owner.id = lsp->ls_id.id;
4650         args->lock_owner.s_dev = server->s_dev;
4651         msg.rpc_argp = args;
4652         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4653 }
4654
4655 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4656
4657 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4658                                    const void *buf, size_t buflen,
4659                                    int flags, int type)
4660 {
4661         if (strcmp(key, "") != 0)
4662                 return -EINVAL;
4663
4664         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4665 }
4666
4667 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4668                                    void *buf, size_t buflen, int type)
4669 {
4670         if (strcmp(key, "") != 0)
4671                 return -EINVAL;
4672
4673         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4674 }
4675
4676 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4677                                        size_t list_len, const char *name,
4678                                        size_t name_len, int type)
4679 {
4680         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4681
4682         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4683                 return 0;
4684
4685         if (list && len <= list_len)
4686                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4687         return len;
4688 }
4689
4690 /*
4691  * nfs_fhget will use either the mounted_on_fileid or the fileid
4692  */
4693 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4694 {
4695         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4696                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4697               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4698               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4699                 return;
4700
4701         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4702                 NFS_ATTR_FATTR_NLINK;
4703         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4704         fattr->nlink = 2;
4705 }
4706
4707 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4708                 struct nfs4_fs_locations *fs_locations, struct page *page)
4709 {
4710         struct nfs_server *server = NFS_SERVER(dir);
4711         u32 bitmask[2] = {
4712                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4713         };
4714         struct nfs4_fs_locations_arg args = {
4715                 .dir_fh = NFS_FH(dir),
4716                 .name = name,
4717                 .page = page,
4718                 .bitmask = bitmask,
4719         };
4720         struct nfs4_fs_locations_res res = {
4721                 .fs_locations = fs_locations,
4722         };
4723         struct rpc_message msg = {
4724                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4725                 .rpc_argp = &args,
4726                 .rpc_resp = &res,
4727         };
4728         int status;
4729
4730         dprintk("%s: start\n", __func__);
4731
4732         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4733          * is not supported */
4734         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4735                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4736         else
4737                 bitmask[0] |= FATTR4_WORD0_FILEID;
4738
4739         nfs_fattr_init(&fs_locations->fattr);
4740         fs_locations->server = server;
4741         fs_locations->nlocations = 0;
4742         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4743         dprintk("%s: returned status = %d\n", __func__, status);
4744         return status;
4745 }
4746
4747 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4748 {
4749         int status;
4750         struct nfs4_secinfo_arg args = {
4751                 .dir_fh = NFS_FH(dir),
4752                 .name   = name,
4753         };
4754         struct nfs4_secinfo_res res = {
4755                 .flavors     = flavors,
4756         };
4757         struct rpc_message msg = {
4758                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4759                 .rpc_argp = &args,
4760                 .rpc_resp = &res,
4761         };
4762
4763         dprintk("NFS call  secinfo %s\n", name->name);
4764         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4765         dprintk("NFS reply  secinfo: %d\n", status);
4766         return status;
4767 }
4768
4769 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4770 {
4771         struct nfs4_exception exception = { };
4772         int err;
4773         do {
4774                 err = nfs4_handle_exception(NFS_SERVER(dir),
4775                                 _nfs4_proc_secinfo(dir, name, flavors),
4776                                 &exception);
4777         } while (exception.retry);
4778         return err;
4779 }
4780
4781 #ifdef CONFIG_NFS_V4_1
4782 /*
4783  * Check the exchange flags returned by the server for invalid flags, having
4784  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4785  * DS flags set.
4786  */
4787 static int nfs4_check_cl_exchange_flags(u32 flags)
4788 {
4789         if (flags & ~EXCHGID4_FLAG_MASK_R)
4790                 goto out_inval;
4791         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4792             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4793                 goto out_inval;
4794         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4795                 goto out_inval;
4796         return NFS_OK;
4797 out_inval:
4798         return -NFS4ERR_INVAL;
4799 }
4800
4801 static bool
4802 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4803 {
4804         if (a->server_scope_sz == b->server_scope_sz &&
4805             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4806                 return true;
4807
4808         return false;
4809 }
4810
4811 /*
4812  * nfs4_proc_exchange_id()
4813  *
4814  * Since the clientid has expired, all compounds using sessions
4815  * associated with the stale clientid will be returning
4816  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4817  * be in some phase of session reset.
4818  */
4819 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4820 {
4821         nfs4_verifier verifier;
4822         struct nfs41_exchange_id_args args = {
4823                 .client = clp,
4824                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4825         };
4826         struct nfs41_exchange_id_res res = {
4827                 .client = clp,
4828         };
4829         int status;
4830         struct rpc_message msg = {
4831                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4832                 .rpc_argp = &args,
4833                 .rpc_resp = &res,
4834                 .rpc_cred = cred,
4835         };
4836         __be32 *p;
4837
4838         dprintk("--> %s\n", __func__);
4839         BUG_ON(clp == NULL);
4840
4841         p = (u32 *)verifier.data;
4842         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4843         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4844         args.verifier = &verifier;
4845
4846         args.id_len = scnprintf(args.id, sizeof(args.id),
4847                                 "%s/%s.%s/%u",
4848                                 clp->cl_ipaddr,
4849                                 init_utsname()->nodename,
4850                                 init_utsname()->domainname,
4851                                 clp->cl_rpcclient->cl_auth->au_flavor);
4852
4853         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4854         if (unlikely(!res.server_scope))
4855                 return -ENOMEM;
4856
4857         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4858         if (!status)
4859                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4860
4861         if (!status) {
4862                 if (clp->server_scope &&
4863                     !nfs41_same_server_scope(clp->server_scope,
4864                                              res.server_scope)) {
4865                         dprintk("%s: server_scope mismatch detected\n",
4866                                 __func__);
4867                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4868                         kfree(clp->server_scope);
4869                         clp->server_scope = NULL;
4870                 }
4871
4872                 if (!clp->server_scope)
4873                         clp->server_scope = res.server_scope;
4874                 else
4875                         kfree(res.server_scope);
4876         }
4877
4878         dprintk("<-- %s status= %d\n", __func__, status);
4879         return status;
4880 }
4881
4882 struct nfs4_get_lease_time_data {
4883         struct nfs4_get_lease_time_args *args;
4884         struct nfs4_get_lease_time_res *res;
4885         struct nfs_client *clp;
4886 };
4887
4888 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4889                                         void *calldata)
4890 {
4891         int ret;
4892         struct nfs4_get_lease_time_data *data =
4893                         (struct nfs4_get_lease_time_data *)calldata;
4894
4895         dprintk("--> %s\n", __func__);
4896         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4897         /* just setup sequence, do not trigger session recovery
4898            since we're invoked within one */
4899         ret = nfs41_setup_sequence(data->clp->cl_session,
4900                                    &data->args->la_seq_args,
4901                                    &data->res->lr_seq_res, 0, task);
4902
4903         BUG_ON(ret == -EAGAIN);
4904         rpc_call_start(task);
4905         dprintk("<-- %s\n", __func__);
4906 }
4907
4908 /*
4909  * Called from nfs4_state_manager thread for session setup, so don't recover
4910  * from sequence operation or clientid errors.
4911  */
4912 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4913 {
4914         struct nfs4_get_lease_time_data *data =
4915                         (struct nfs4_get_lease_time_data *)calldata;
4916
4917         dprintk("--> %s\n", __func__);
4918         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4919                 return;
4920         switch (task->tk_status) {
4921         case -NFS4ERR_DELAY:
4922         case -NFS4ERR_GRACE:
4923                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4924                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4925                 task->tk_status = 0;
4926                 /* fall through */
4927         case -NFS4ERR_RETRY_UNCACHED_REP:
4928                 rpc_restart_call_prepare(task);
4929                 return;
4930         }
4931         dprintk("<-- %s\n", __func__);
4932 }
4933
4934 struct rpc_call_ops nfs4_get_lease_time_ops = {
4935         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4936         .rpc_call_done = nfs4_get_lease_time_done,
4937 };
4938
4939 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4940 {
4941         struct rpc_task *task;
4942         struct nfs4_get_lease_time_args args;
4943         struct nfs4_get_lease_time_res res = {
4944                 .lr_fsinfo = fsinfo,
4945         };
4946         struct nfs4_get_lease_time_data data = {
4947                 .args = &args,
4948                 .res = &res,
4949                 .clp = clp,
4950         };
4951         struct rpc_message msg = {
4952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4953                 .rpc_argp = &args,
4954                 .rpc_resp = &res,
4955         };
4956         struct rpc_task_setup task_setup = {
4957                 .rpc_client = clp->cl_rpcclient,
4958                 .rpc_message = &msg,
4959                 .callback_ops = &nfs4_get_lease_time_ops,
4960                 .callback_data = &data,
4961                 .flags = RPC_TASK_TIMEOUT,
4962         };
4963         int status;
4964
4965         dprintk("--> %s\n", __func__);
4966         task = rpc_run_task(&task_setup);
4967
4968         if (IS_ERR(task))
4969                 status = PTR_ERR(task);
4970         else {
4971                 status = task->tk_status;
4972                 rpc_put_task(task);
4973         }
4974         dprintk("<-- %s return %d\n", __func__, status);
4975
4976         return status;
4977 }
4978
4979 /*
4980  * Reset a slot table
4981  */
4982 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4983                                  int ivalue)
4984 {
4985         struct nfs4_slot *new = NULL;
4986         int i;
4987         int ret = 0;
4988
4989         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4990                 max_reqs, tbl->max_slots);
4991
4992         /* Does the newly negotiated max_reqs match the existing slot table? */
4993         if (max_reqs != tbl->max_slots) {
4994                 ret = -ENOMEM;
4995                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4996                               GFP_NOFS);
4997                 if (!new)
4998                         goto out;
4999                 ret = 0;
5000                 kfree(tbl->slots);
5001         }
5002         spin_lock(&tbl->slot_tbl_lock);
5003         if (new) {
5004                 tbl->slots = new;
5005                 tbl->max_slots = max_reqs;
5006         }
5007         for (i = 0; i < tbl->max_slots; ++i)
5008                 tbl->slots[i].seq_nr = ivalue;
5009         spin_unlock(&tbl->slot_tbl_lock);
5010         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5011                 tbl, tbl->slots, tbl->max_slots);
5012 out:
5013         dprintk("<-- %s: return %d\n", __func__, ret);
5014         return ret;
5015 }
5016
5017 /*
5018  * Reset the forechannel and backchannel slot tables
5019  */
5020 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5021 {
5022         int status;
5023
5024         status = nfs4_reset_slot_table(&session->fc_slot_table,
5025                         session->fc_attrs.max_reqs, 1);
5026         if (status)
5027                 return status;
5028
5029         status = nfs4_reset_slot_table(&session->bc_slot_table,
5030                         session->bc_attrs.max_reqs, 0);
5031         return status;
5032 }
5033
5034 /* Destroy the slot table */
5035 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5036 {
5037         if (session->fc_slot_table.slots != NULL) {
5038                 kfree(session->fc_slot_table.slots);
5039                 session->fc_slot_table.slots = NULL;
5040         }
5041         if (session->bc_slot_table.slots != NULL) {
5042                 kfree(session->bc_slot_table.slots);
5043                 session->bc_slot_table.slots = NULL;
5044         }
5045         return;
5046 }
5047
5048 /*
5049  * Initialize slot table
5050  */
5051 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5052                 int max_slots, int ivalue)
5053 {
5054         struct nfs4_slot *slot;
5055         int ret = -ENOMEM;
5056
5057         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5058
5059         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5060
5061         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5062         if (!slot)
5063                 goto out;
5064         ret = 0;
5065
5066         spin_lock(&tbl->slot_tbl_lock);
5067         tbl->max_slots = max_slots;
5068         tbl->slots = slot;
5069         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5070         spin_unlock(&tbl->slot_tbl_lock);
5071         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5072                 tbl, tbl->slots, tbl->max_slots);
5073 out:
5074         dprintk("<-- %s: return %d\n", __func__, ret);
5075         return ret;
5076 }
5077
5078 /*
5079  * Initialize the forechannel and backchannel tables
5080  */
5081 static int nfs4_init_slot_tables(struct nfs4_session *session)
5082 {
5083         struct nfs4_slot_table *tbl;
5084         int status = 0;
5085
5086         tbl = &session->fc_slot_table;
5087         if (tbl->slots == NULL) {
5088                 status = nfs4_init_slot_table(tbl,
5089                                 session->fc_attrs.max_reqs, 1);
5090                 if (status)
5091                         return status;
5092         }
5093
5094         tbl = &session->bc_slot_table;
5095         if (tbl->slots == NULL) {
5096                 status = nfs4_init_slot_table(tbl,
5097                                 session->bc_attrs.max_reqs, 0);
5098                 if (status)
5099                         nfs4_destroy_slot_tables(session);
5100         }
5101
5102         return status;
5103 }
5104
5105 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5106 {
5107         struct nfs4_session *session;
5108         struct nfs4_slot_table *tbl;
5109
5110         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5111         if (!session)
5112                 return NULL;
5113
5114         tbl = &session->fc_slot_table;
5115         tbl->highest_used_slotid = -1;
5116         spin_lock_init(&tbl->slot_tbl_lock);
5117         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5118         init_completion(&tbl->complete);
5119
5120         tbl = &session->bc_slot_table;
5121         tbl->highest_used_slotid = -1;
5122         spin_lock_init(&tbl->slot_tbl_lock);
5123         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5124         init_completion(&tbl->complete);
5125
5126         session->session_state = 1<<NFS4_SESSION_INITING;
5127
5128         session->clp = clp;
5129         return session;
5130 }
5131
5132 void nfs4_destroy_session(struct nfs4_session *session)
5133 {
5134         nfs4_proc_destroy_session(session);
5135         dprintk("%s Destroy backchannel for xprt %p\n",
5136                 __func__, session->clp->cl_rpcclient->cl_xprt);
5137         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5138                                 NFS41_BC_MIN_CALLBACKS);
5139         nfs4_destroy_slot_tables(session);
5140         kfree(session);
5141 }
5142
5143 /*
5144  * Initialize the values to be used by the client in CREATE_SESSION
5145  * If nfs4_init_session set the fore channel request and response sizes,
5146  * use them.
5147  *
5148  * Set the back channel max_resp_sz_cached to zero to force the client to
5149  * always set csa_cachethis to FALSE because the current implementation
5150  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5151  */
5152 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5153 {
5154         struct nfs4_session *session = args->client->cl_session;
5155         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5156                      mxresp_sz = session->fc_attrs.max_resp_sz;
5157
5158         if (mxrqst_sz == 0)
5159                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5160         if (mxresp_sz == 0)
5161                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5162         /* Fore channel attributes */
5163         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5164         args->fc_attrs.max_resp_sz = mxresp_sz;
5165         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5166         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5167
5168         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5169                 "max_ops=%u max_reqs=%u\n",
5170                 __func__,
5171                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5172                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5173
5174         /* Back channel attributes */
5175         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5176         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5177         args->bc_attrs.max_resp_sz_cached = 0;
5178         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5179         args->bc_attrs.max_reqs = 1;
5180
5181         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5182                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5183                 __func__,
5184                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5185                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5186                 args->bc_attrs.max_reqs);
5187 }
5188
5189 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5190 {
5191         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5192         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5193
5194         if (rcvd->max_resp_sz > sent->max_resp_sz)
5195                 return -EINVAL;
5196         /*
5197          * Our requested max_ops is the minimum we need; we're not
5198          * prepared to break up compounds into smaller pieces than that.
5199          * So, no point even trying to continue if the server won't
5200          * cooperate:
5201          */
5202         if (rcvd->max_ops < sent->max_ops)
5203                 return -EINVAL;
5204         if (rcvd->max_reqs == 0)
5205                 return -EINVAL;
5206         return 0;
5207 }
5208
5209 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5210 {
5211         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5212         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5213
5214         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5215                 return -EINVAL;
5216         if (rcvd->max_resp_sz < sent->max_resp_sz)
5217                 return -EINVAL;
5218         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5219                 return -EINVAL;
5220         /* These would render the backchannel useless: */
5221         if (rcvd->max_ops  == 0)
5222                 return -EINVAL;
5223         if (rcvd->max_reqs == 0)
5224                 return -EINVAL;
5225         return 0;
5226 }
5227
5228 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5229                                      struct nfs4_session *session)
5230 {
5231         int ret;
5232
5233         ret = nfs4_verify_fore_channel_attrs(args, session);
5234         if (ret)
5235                 return ret;
5236         return nfs4_verify_back_channel_attrs(args, session);
5237 }
5238
5239 static int _nfs4_proc_create_session(struct nfs_client *clp)
5240 {
5241         struct nfs4_session *session = clp->cl_session;
5242         struct nfs41_create_session_args args = {
5243                 .client = clp,
5244                 .cb_program = NFS4_CALLBACK,
5245         };
5246         struct nfs41_create_session_res res = {
5247                 .client = clp,
5248         };
5249         struct rpc_message msg = {
5250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5251                 .rpc_argp = &args,
5252                 .rpc_resp = &res,
5253         };
5254         int status;
5255
5256         nfs4_init_channel_attrs(&args);
5257         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5258
5259         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5260
5261         if (!status)
5262                 /* Verify the session's negotiated channel_attrs values */
5263                 status = nfs4_verify_channel_attrs(&args, session);
5264         if (!status) {
5265                 /* Increment the clientid slot sequence id */
5266                 clp->cl_seqid++;
5267         }
5268
5269         return status;
5270 }
5271
5272 /*
5273  * Issues a CREATE_SESSION operation to the server.
5274  * It is the responsibility of the caller to verify the session is
5275  * expired before calling this routine.
5276  */
5277 int nfs4_proc_create_session(struct nfs_client *clp)
5278 {
5279         int status;
5280         unsigned *ptr;
5281         struct nfs4_session *session = clp->cl_session;
5282
5283         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5284
5285         status = _nfs4_proc_create_session(clp);
5286         if (status)
5287                 goto out;
5288
5289         /* Init and reset the fore channel */
5290         status = nfs4_init_slot_tables(session);
5291         dprintk("slot table initialization returned %d\n", status);
5292         if (status)
5293                 goto out;
5294         status = nfs4_reset_slot_tables(session);
5295         dprintk("slot table reset returned %d\n", status);
5296         if (status)
5297                 goto out;
5298
5299         ptr = (unsigned *)&session->sess_id.data[0];
5300         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5301                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5302 out:
5303         dprintk("<-- %s\n", __func__);
5304         return status;
5305 }
5306
5307 /*
5308  * Issue the over-the-wire RPC DESTROY_SESSION.
5309  * The caller must serialize access to this routine.
5310  */
5311 int nfs4_proc_destroy_session(struct nfs4_session *session)
5312 {
5313         int status = 0;
5314         struct rpc_message msg;
5315
5316         dprintk("--> nfs4_proc_destroy_session\n");
5317
5318         /* session is still being setup */
5319         if (session->clp->cl_cons_state != NFS_CS_READY)
5320                 return status;
5321
5322         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5323         msg.rpc_argp = session;
5324         msg.rpc_resp = NULL;
5325         msg.rpc_cred = NULL;
5326         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5327
5328         if (status)
5329                 printk(KERN_WARNING
5330                         "Got error %d from the server on DESTROY_SESSION. "
5331                         "Session has been destroyed regardless...\n", status);
5332
5333         dprintk("<-- nfs4_proc_destroy_session\n");
5334         return status;
5335 }
5336
5337 int nfs4_init_session(struct nfs_server *server)
5338 {
5339         struct nfs_client *clp = server->nfs_client;
5340         struct nfs4_session *session;
5341         unsigned int rsize, wsize;
5342         int ret;
5343
5344         if (!nfs4_has_session(clp))
5345                 return 0;
5346
5347         session = clp->cl_session;
5348         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5349                 return 0;
5350
5351         rsize = server->rsize;
5352         if (rsize == 0)
5353                 rsize = NFS_MAX_FILE_IO_SIZE;
5354         wsize = server->wsize;
5355         if (wsize == 0)
5356                 wsize = NFS_MAX_FILE_IO_SIZE;
5357
5358         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5359         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5360
5361         ret = nfs4_recover_expired_lease(server);
5362         if (!ret)
5363                 ret = nfs4_check_client_ready(clp);
5364         return ret;
5365 }
5366
5367 int nfs4_init_ds_session(struct nfs_client *clp)
5368 {
5369         struct nfs4_session *session = clp->cl_session;
5370         int ret;
5371
5372         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5373                 return 0;
5374
5375         ret = nfs4_client_recover_expired_lease(clp);
5376         if (!ret)
5377                 /* Test for the DS role */
5378                 if (!is_ds_client(clp))
5379                         ret = -ENODEV;
5380         if (!ret)
5381                 ret = nfs4_check_client_ready(clp);
5382         return ret;
5383
5384 }
5385 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5386
5387
5388 /*
5389  * Renew the cl_session lease.
5390  */
5391 struct nfs4_sequence_data {
5392         struct nfs_client *clp;
5393         struct nfs4_sequence_args args;
5394         struct nfs4_sequence_res res;
5395 };
5396
5397 static void nfs41_sequence_release(void *data)
5398 {
5399         struct nfs4_sequence_data *calldata = data;
5400         struct nfs_client *clp = calldata->clp;
5401
5402         if (atomic_read(&clp->cl_count) > 1)
5403                 nfs4_schedule_state_renewal(clp);
5404         nfs_put_client(clp);
5405         kfree(calldata);
5406 }
5407
5408 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5409 {
5410         switch(task->tk_status) {
5411         case -NFS4ERR_DELAY:
5412                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5413                 return -EAGAIN;
5414         default:
5415                 nfs4_schedule_lease_recovery(clp);
5416         }
5417         return 0;
5418 }
5419
5420 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5421 {
5422         struct nfs4_sequence_data *calldata = data;
5423         struct nfs_client *clp = calldata->clp;
5424
5425         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5426                 return;
5427
5428         if (task->tk_status < 0) {
5429                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5430                 if (atomic_read(&clp->cl_count) == 1)
5431                         goto out;
5432
5433                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5434                         rpc_restart_call_prepare(task);
5435                         return;
5436                 }
5437         }
5438         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5439 out:
5440         dprintk("<-- %s\n", __func__);
5441 }
5442
5443 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5444 {
5445         struct nfs4_sequence_data *calldata = data;
5446         struct nfs_client *clp = calldata->clp;
5447         struct nfs4_sequence_args *args;
5448         struct nfs4_sequence_res *res;
5449
5450         args = task->tk_msg.rpc_argp;
5451         res = task->tk_msg.rpc_resp;
5452
5453         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5454                 return;
5455         rpc_call_start(task);
5456 }
5457
5458 static const struct rpc_call_ops nfs41_sequence_ops = {
5459         .rpc_call_done = nfs41_sequence_call_done,
5460         .rpc_call_prepare = nfs41_sequence_prepare,
5461         .rpc_release = nfs41_sequence_release,
5462 };
5463
5464 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5465 {
5466         struct nfs4_sequence_data *calldata;
5467         struct rpc_message msg = {
5468                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5469                 .rpc_cred = cred,
5470         };
5471         struct rpc_task_setup task_setup_data = {
5472                 .rpc_client = clp->cl_rpcclient,
5473                 .rpc_message = &msg,
5474                 .callback_ops = &nfs41_sequence_ops,
5475                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5476         };
5477
5478         if (!atomic_inc_not_zero(&clp->cl_count))
5479                 return ERR_PTR(-EIO);
5480         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5481         if (calldata == NULL) {
5482                 nfs_put_client(clp);
5483                 return ERR_PTR(-ENOMEM);
5484         }
5485         msg.rpc_argp = &calldata->args;
5486         msg.rpc_resp = &calldata->res;
5487         calldata->clp = clp;
5488         task_setup_data.callback_data = calldata;
5489
5490         return rpc_run_task(&task_setup_data);
5491 }
5492
5493 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5494 {
5495         struct rpc_task *task;
5496         int ret = 0;
5497
5498         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5499                 return 0;
5500         task = _nfs41_proc_sequence(clp, cred);
5501         if (IS_ERR(task))
5502                 ret = PTR_ERR(task);
5503         else
5504                 rpc_put_task_async(task);
5505         dprintk("<-- %s status=%d\n", __func__, ret);
5506         return ret;
5507 }
5508
5509 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5510 {
5511         struct rpc_task *task;
5512         int ret;
5513
5514         task = _nfs41_proc_sequence(clp, cred);
5515         if (IS_ERR(task)) {
5516                 ret = PTR_ERR(task);
5517                 goto out;
5518         }
5519         ret = rpc_wait_for_completion_task(task);
5520         if (!ret) {
5521                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5522
5523                 if (task->tk_status == 0)
5524                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5525                 ret = task->tk_status;
5526         }
5527         rpc_put_task(task);
5528 out:
5529         dprintk("<-- %s status=%d\n", __func__, ret);
5530         return ret;
5531 }
5532
5533 struct nfs4_reclaim_complete_data {
5534         struct nfs_client *clp;
5535         struct nfs41_reclaim_complete_args arg;
5536         struct nfs41_reclaim_complete_res res;
5537 };
5538
5539 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5540 {
5541         struct nfs4_reclaim_complete_data *calldata = data;
5542
5543         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5544         if (nfs41_setup_sequence(calldata->clp->cl_session,
5545                                 &calldata->arg.seq_args,
5546                                 &calldata->res.seq_res, 0, task))
5547                 return;
5548
5549         rpc_call_start(task);
5550 }
5551
5552 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5553 {
5554         switch(task->tk_status) {
5555         case 0:
5556         case -NFS4ERR_COMPLETE_ALREADY:
5557         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5558                 break;
5559         case -NFS4ERR_DELAY:
5560                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5561                 /* fall through */
5562         case -NFS4ERR_RETRY_UNCACHED_REP:
5563                 return -EAGAIN;
5564         default:
5565                 nfs4_schedule_lease_recovery(clp);
5566         }
5567         return 0;
5568 }
5569
5570 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5571 {
5572         struct nfs4_reclaim_complete_data *calldata = data;
5573         struct nfs_client *clp = calldata->clp;
5574         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5575
5576         dprintk("--> %s\n", __func__);
5577         if (!nfs41_sequence_done(task, res))
5578                 return;
5579
5580         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5581                 rpc_restart_call_prepare(task);
5582                 return;
5583         }
5584         dprintk("<-- %s\n", __func__);
5585 }
5586
5587 static void nfs4_free_reclaim_complete_data(void *data)
5588 {
5589         struct nfs4_reclaim_complete_data *calldata = data;
5590
5591         kfree(calldata);
5592 }
5593
5594 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5595         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5596         .rpc_call_done = nfs4_reclaim_complete_done,
5597         .rpc_release = nfs4_free_reclaim_complete_data,
5598 };
5599
5600 /*
5601  * Issue a global reclaim complete.
5602  */
5603 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5604 {
5605         struct nfs4_reclaim_complete_data *calldata;
5606         struct rpc_task *task;
5607         struct rpc_message msg = {
5608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5609         };
5610         struct rpc_task_setup task_setup_data = {
5611                 .rpc_client = clp->cl_rpcclient,
5612                 .rpc_message = &msg,
5613                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5614                 .flags = RPC_TASK_ASYNC,
5615         };
5616         int status = -ENOMEM;
5617
5618         dprintk("--> %s\n", __func__);
5619         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5620         if (calldata == NULL)
5621                 goto out;
5622         calldata->clp = clp;
5623         calldata->arg.one_fs = 0;
5624
5625         msg.rpc_argp = &calldata->arg;
5626         msg.rpc_resp = &calldata->res;
5627         task_setup_data.callback_data = calldata;
5628         task = rpc_run_task(&task_setup_data);
5629         if (IS_ERR(task)) {
5630                 status = PTR_ERR(task);
5631                 goto out;
5632         }
5633         status = nfs4_wait_for_completion_rpc_task(task);
5634         if (status == 0)
5635                 status = task->tk_status;
5636         rpc_put_task(task);
5637         return 0;
5638 out:
5639         dprintk("<-- %s status=%d\n", __func__, status);
5640         return status;
5641 }
5642
5643 static void
5644 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5645 {
5646         struct nfs4_layoutget *lgp = calldata;
5647         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5648
5649         dprintk("--> %s\n", __func__);
5650         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5651          * right now covering the LAYOUTGET we are about to send.
5652          * However, that is not so catastrophic, and there seems
5653          * to be no way to prevent it completely.
5654          */
5655         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5656                                 &lgp->res.seq_res, 0, task))
5657                 return;
5658         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5659                                           NFS_I(lgp->args.inode)->layout,
5660                                           lgp->args.ctx->state)) {
5661                 rpc_exit(task, NFS4_OK);
5662                 return;
5663         }
5664         rpc_call_start(task);
5665 }
5666
5667 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5668 {
5669         struct nfs4_layoutget *lgp = calldata;
5670         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5671
5672         dprintk("--> %s\n", __func__);
5673
5674         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5675                 return;
5676
5677         switch (task->tk_status) {
5678         case 0:
5679                 break;
5680         case -NFS4ERR_LAYOUTTRYLATER:
5681         case -NFS4ERR_RECALLCONFLICT:
5682                 task->tk_status = -NFS4ERR_DELAY;
5683                 /* Fall through */
5684         default:
5685                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5686                         rpc_restart_call_prepare(task);
5687                         return;
5688                 }
5689         }
5690         dprintk("<-- %s\n", __func__);
5691 }
5692
5693 static void nfs4_layoutget_release(void *calldata)
5694 {
5695         struct nfs4_layoutget *lgp = calldata;
5696
5697         dprintk("--> %s\n", __func__);
5698         put_nfs_open_context(lgp->args.ctx);
5699         kfree(calldata);
5700         dprintk("<-- %s\n", __func__);
5701 }
5702
5703 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5704         .rpc_call_prepare = nfs4_layoutget_prepare,
5705         .rpc_call_done = nfs4_layoutget_done,
5706         .rpc_release = nfs4_layoutget_release,
5707 };
5708
5709 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5710 {
5711         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5712         struct rpc_task *task;
5713         struct rpc_message msg = {
5714                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5715                 .rpc_argp = &lgp->args,
5716                 .rpc_resp = &lgp->res,
5717         };
5718         struct rpc_task_setup task_setup_data = {
5719                 .rpc_client = server->client,
5720                 .rpc_message = &msg,
5721                 .callback_ops = &nfs4_layoutget_call_ops,
5722                 .callback_data = lgp,
5723                 .flags = RPC_TASK_ASYNC,
5724         };
5725         int status = 0;
5726
5727         dprintk("--> %s\n", __func__);
5728
5729         lgp->res.layoutp = &lgp->args.layout;
5730         lgp->res.seq_res.sr_slot = NULL;
5731         task = rpc_run_task(&task_setup_data);
5732         if (IS_ERR(task))
5733                 return PTR_ERR(task);
5734         status = nfs4_wait_for_completion_rpc_task(task);
5735         if (status == 0)
5736                 status = task->tk_status;
5737         if (status == 0)
5738                 status = pnfs_layout_process(lgp);
5739         rpc_put_task(task);
5740         dprintk("<-- %s status=%d\n", __func__, status);
5741         return status;
5742 }
5743
5744 static void
5745 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5746 {
5747         struct nfs4_layoutreturn *lrp = calldata;
5748
5749         dprintk("--> %s\n", __func__);
5750         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5751                                 &lrp->res.seq_res, 0, task))
5752                 return;
5753         rpc_call_start(task);
5754 }
5755
5756 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5757 {
5758         struct nfs4_layoutreturn *lrp = calldata;
5759         struct nfs_server *server;
5760         struct pnfs_layout_hdr *lo = lrp->args.layout;
5761
5762         dprintk("--> %s\n", __func__);
5763
5764         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5765                 return;
5766
5767         server = NFS_SERVER(lrp->args.inode);
5768         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5769                 rpc_restart_call_prepare(task);
5770                 return;
5771         }
5772         spin_lock(&lo->plh_inode->i_lock);
5773         if (task->tk_status == 0) {
5774                 if (lrp->res.lrs_present) {
5775                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5776                 } else
5777                         BUG_ON(!list_empty(&lo->plh_segs));
5778         }
5779         lo->plh_block_lgets--;
5780         spin_unlock(&lo->plh_inode->i_lock);
5781         dprintk("<-- %s\n", __func__);
5782 }
5783
5784 static void nfs4_layoutreturn_release(void *calldata)
5785 {
5786         struct nfs4_layoutreturn *lrp = calldata;
5787
5788         dprintk("--> %s\n", __func__);
5789         put_layout_hdr(lrp->args.layout);
5790         kfree(calldata);
5791         dprintk("<-- %s\n", __func__);
5792 }
5793
5794 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5795         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5796         .rpc_call_done = nfs4_layoutreturn_done,
5797         .rpc_release = nfs4_layoutreturn_release,
5798 };
5799
5800 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5801 {
5802         struct rpc_task *task;
5803         struct rpc_message msg = {
5804                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5805                 .rpc_argp = &lrp->args,
5806                 .rpc_resp = &lrp->res,
5807         };
5808         struct rpc_task_setup task_setup_data = {
5809                 .rpc_client = lrp->clp->cl_rpcclient,
5810                 .rpc_message = &msg,
5811                 .callback_ops = &nfs4_layoutreturn_call_ops,
5812                 .callback_data = lrp,
5813         };
5814         int status;
5815
5816         dprintk("--> %s\n", __func__);
5817         task = rpc_run_task(&task_setup_data);
5818         if (IS_ERR(task))
5819                 return PTR_ERR(task);
5820         status = task->tk_status;
5821         dprintk("<-- %s status=%d\n", __func__, status);
5822         rpc_put_task(task);
5823         return status;
5824 }
5825
5826 /*
5827  * Retrieve the list of Data Server devices from the MDS.
5828  */
5829 static int _nfs4_getdevicelist(struct nfs_server *server,
5830                                     const struct nfs_fh *fh,
5831                                     struct pnfs_devicelist *devlist)
5832 {
5833         struct nfs4_getdevicelist_args args = {
5834                 .fh = fh,
5835                 .layoutclass = server->pnfs_curr_ld->id,
5836         };
5837         struct nfs4_getdevicelist_res res = {
5838                 .devlist = devlist,
5839         };
5840         struct rpc_message msg = {
5841                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5842                 .rpc_argp = &args,
5843                 .rpc_resp = &res,
5844         };
5845         int status;
5846
5847         dprintk("--> %s\n", __func__);
5848         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5849                                 &res.seq_res, 0);
5850         dprintk("<-- %s status=%d\n", __func__, status);
5851         return status;
5852 }
5853
5854 int nfs4_proc_getdevicelist(struct nfs_server *server,
5855                             const struct nfs_fh *fh,
5856                             struct pnfs_devicelist *devlist)
5857 {
5858         struct nfs4_exception exception = { };
5859         int err;
5860
5861         do {
5862                 err = nfs4_handle_exception(server,
5863                                 _nfs4_getdevicelist(server, fh, devlist),
5864                                 &exception);
5865         } while (exception.retry);
5866
5867         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5868                 err, devlist->num_devs);
5869
5870         return err;
5871 }
5872 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5873
5874 static int
5875 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5876 {
5877         struct nfs4_getdeviceinfo_args args = {
5878                 .pdev = pdev,
5879         };
5880         struct nfs4_getdeviceinfo_res res = {
5881                 .pdev = pdev,
5882         };
5883         struct rpc_message msg = {
5884                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5885                 .rpc_argp = &args,
5886                 .rpc_resp = &res,
5887         };
5888         int status;
5889
5890         dprintk("--> %s\n", __func__);
5891         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5892         dprintk("<-- %s status=%d\n", __func__, status);
5893
5894         return status;
5895 }
5896
5897 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5898 {
5899         struct nfs4_exception exception = { };
5900         int err;
5901
5902         do {
5903                 err = nfs4_handle_exception(server,
5904                                         _nfs4_proc_getdeviceinfo(server, pdev),
5905                                         &exception);
5906         } while (exception.retry);
5907         return err;
5908 }
5909 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5910
5911 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5912 {
5913         struct nfs4_layoutcommit_data *data = calldata;
5914         struct nfs_server *server = NFS_SERVER(data->args.inode);
5915
5916         if (nfs4_setup_sequence(server, &data->args.seq_args,
5917                                 &data->res.seq_res, 1, task))
5918                 return;
5919         rpc_call_start(task);
5920 }
5921
5922 static void
5923 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5924 {
5925         struct nfs4_layoutcommit_data *data = calldata;
5926         struct nfs_server *server = NFS_SERVER(data->args.inode);
5927
5928         if (!nfs4_sequence_done(task, &data->res.seq_res))
5929                 return;
5930
5931         switch (task->tk_status) { /* Just ignore these failures */
5932         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5933         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5934         case NFS4ERR_BADLAYOUT:     /* no layout */
5935         case NFS4ERR_GRACE:         /* loca_recalim always false */
5936                 task->tk_status = 0;
5937         }
5938
5939         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5940                 rpc_restart_call_prepare(task);
5941                 return;
5942         }
5943
5944         if (task->tk_status == 0)
5945                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5946                                                    data->res.fattr);
5947 }
5948
5949 static void nfs4_layoutcommit_release(void *calldata)
5950 {
5951         struct nfs4_layoutcommit_data *data = calldata;
5952         struct pnfs_layout_segment *lseg, *tmp;
5953         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
5954
5955         pnfs_cleanup_layoutcommit(data);
5956         /* Matched by references in pnfs_set_layoutcommit */
5957         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5958                 list_del_init(&lseg->pls_lc_list);
5959                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5960                                        &lseg->pls_flags))
5961                         put_lseg(lseg);
5962         }
5963
5964         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
5965         smp_mb__after_clear_bit();
5966         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
5967
5968         put_rpccred(data->cred);
5969         kfree(data);
5970 }
5971
5972 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5973         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5974         .rpc_call_done = nfs4_layoutcommit_done,
5975         .rpc_release = nfs4_layoutcommit_release,
5976 };
5977
5978 int
5979 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5980 {
5981         struct rpc_message msg = {
5982                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5983                 .rpc_argp = &data->args,
5984                 .rpc_resp = &data->res,
5985                 .rpc_cred = data->cred,
5986         };
5987         struct rpc_task_setup task_setup_data = {
5988                 .task = &data->task,
5989                 .rpc_client = NFS_CLIENT(data->args.inode),
5990                 .rpc_message = &msg,
5991                 .callback_ops = &nfs4_layoutcommit_ops,
5992                 .callback_data = data,
5993                 .flags = RPC_TASK_ASYNC,
5994         };
5995         struct rpc_task *task;
5996         int status = 0;
5997
5998         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5999                 "lbw: %llu inode %lu\n",
6000                 data->task.tk_pid, sync,
6001                 data->args.lastbytewritten,
6002                 data->args.inode->i_ino);
6003
6004         task = rpc_run_task(&task_setup_data);
6005         if (IS_ERR(task))
6006                 return PTR_ERR(task);
6007         if (sync == false)
6008                 goto out;
6009         status = nfs4_wait_for_completion_rpc_task(task);
6010         if (status != 0)
6011                 goto out;
6012         status = task->tk_status;
6013 out:
6014         dprintk("%s: status %d\n", __func__, status);
6015         rpc_put_task(task);
6016         return status;
6017 }
6018
6019 static int
6020 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6021                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6022 {
6023         struct nfs41_secinfo_no_name_args args = {
6024                 .style = SECINFO_STYLE_CURRENT_FH,
6025         };
6026         struct nfs4_secinfo_res res = {
6027                 .flavors = flavors,
6028         };
6029         struct rpc_message msg = {
6030                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6031                 .rpc_argp = &args,
6032                 .rpc_resp = &res,
6033         };
6034         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6035 }
6036
6037 static int
6038 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6039                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6040 {
6041         struct nfs4_exception exception = { };
6042         int err;
6043         do {
6044                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6045                 switch (err) {
6046                 case 0:
6047                 case -NFS4ERR_WRONGSEC:
6048                 case -NFS4ERR_NOTSUPP:
6049                         break;
6050                 default:
6051                         err = nfs4_handle_exception(server, err, &exception);
6052                 }
6053         } while (exception.retry);
6054         return err;
6055 }
6056
6057 static int
6058 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6059                     struct nfs_fsinfo *info)
6060 {
6061         int err;
6062         struct page *page;
6063         rpc_authflavor_t flavor;
6064         struct nfs4_secinfo_flavors *flavors;
6065
6066         page = alloc_page(GFP_KERNEL);
6067         if (!page) {
6068                 err = -ENOMEM;
6069                 goto out;
6070         }
6071
6072         flavors = page_address(page);
6073         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6074
6075         /*
6076          * Fall back on "guess and check" method if
6077          * the server doesn't support SECINFO_NO_NAME
6078          */
6079         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6080                 err = nfs4_find_root_sec(server, fhandle, info);
6081                 goto out_freepage;
6082         }
6083         if (err)
6084                 goto out_freepage;
6085
6086         flavor = nfs_find_best_sec(flavors);
6087         if (err == 0)
6088                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6089
6090 out_freepage:
6091         put_page(page);
6092         if (err == -EACCES)
6093                 return -EPERM;
6094 out:
6095         return err;
6096 }
6097 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6098 {
6099         int status;
6100         struct nfs41_test_stateid_args args = {
6101                 .stateid = &state->stateid,
6102         };
6103         struct nfs41_test_stateid_res res;
6104         struct rpc_message msg = {
6105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6106                 .rpc_argp = &args,
6107                 .rpc_resp = &res,
6108         };
6109         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6110         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6111         return status;
6112 }
6113
6114 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6115 {
6116         struct nfs4_exception exception = { };
6117         int err;
6118         do {
6119                 err = nfs4_handle_exception(server,
6120                                 _nfs41_test_stateid(server, state),
6121                                 &exception);
6122         } while (exception.retry);
6123         return err;
6124 }
6125
6126 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6127 {
6128         int status;
6129         struct nfs41_free_stateid_args args = {
6130                 .stateid = &state->stateid,
6131         };
6132         struct nfs41_free_stateid_res res;
6133         struct rpc_message msg = {
6134                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6135                 .rpc_argp = &args,
6136                 .rpc_resp = &res,
6137         };
6138
6139         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6140         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6141         return status;
6142 }
6143
6144 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6145 {
6146         struct nfs4_exception exception = { };
6147         int err;
6148         do {
6149                 err = nfs4_handle_exception(server,
6150                                 _nfs4_free_stateid(server, state),
6151                                 &exception);
6152         } while (exception.retry);
6153         return err;
6154 }
6155 #endif /* CONFIG_NFS_V4_1 */
6156
6157 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6158         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6159         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6160         .recover_open   = nfs4_open_reclaim,
6161         .recover_lock   = nfs4_lock_reclaim,
6162         .establish_clid = nfs4_init_clientid,
6163         .get_clid_cred  = nfs4_get_setclientid_cred,
6164 };
6165
6166 #if defined(CONFIG_NFS_V4_1)
6167 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6168         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6169         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6170         .recover_open   = nfs4_open_reclaim,
6171         .recover_lock   = nfs4_lock_reclaim,
6172         .establish_clid = nfs41_init_clientid,
6173         .get_clid_cred  = nfs4_get_exchange_id_cred,
6174         .reclaim_complete = nfs41_proc_reclaim_complete,
6175 };
6176 #endif /* CONFIG_NFS_V4_1 */
6177
6178 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6179         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6180         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6181         .recover_open   = nfs4_open_expired,
6182         .recover_lock   = nfs4_lock_expired,
6183         .establish_clid = nfs4_init_clientid,
6184         .get_clid_cred  = nfs4_get_setclientid_cred,
6185 };
6186
6187 #if defined(CONFIG_NFS_V4_1)
6188 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6189         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6190         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6191         .recover_open   = nfs41_open_expired,
6192         .recover_lock   = nfs41_lock_expired,
6193         .establish_clid = nfs41_init_clientid,
6194         .get_clid_cred  = nfs4_get_exchange_id_cred,
6195 };
6196 #endif /* CONFIG_NFS_V4_1 */
6197
6198 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6199         .sched_state_renewal = nfs4_proc_async_renew,
6200         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6201         .renew_lease = nfs4_proc_renew,
6202 };
6203
6204 #if defined(CONFIG_NFS_V4_1)
6205 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6206         .sched_state_renewal = nfs41_proc_async_sequence,
6207         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6208         .renew_lease = nfs4_proc_sequence,
6209 };
6210 #endif
6211
6212 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6213         .minor_version = 0,
6214         .call_sync = _nfs4_call_sync,
6215         .validate_stateid = nfs4_validate_delegation_stateid,
6216         .find_root_sec = nfs4_find_root_sec,
6217         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6218         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6219         .state_renewal_ops = &nfs40_state_renewal_ops,
6220 };
6221
6222 #if defined(CONFIG_NFS_V4_1)
6223 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6224         .minor_version = 1,
6225         .call_sync = _nfs4_call_sync_session,
6226         .validate_stateid = nfs41_validate_delegation_stateid,
6227         .find_root_sec = nfs41_find_root_sec,
6228         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6229         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6230         .state_renewal_ops = &nfs41_state_renewal_ops,
6231 };
6232 #endif
6233
6234 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6235         [0] = &nfs_v4_0_minor_ops,
6236 #if defined(CONFIG_NFS_V4_1)
6237         [1] = &nfs_v4_1_minor_ops,
6238 #endif
6239 };
6240
6241 static const struct inode_operations nfs4_file_inode_operations = {
6242         .permission     = nfs_permission,
6243         .getattr        = nfs_getattr,
6244         .setattr        = nfs_setattr,
6245         .getxattr       = generic_getxattr,
6246         .setxattr       = generic_setxattr,
6247         .listxattr      = generic_listxattr,
6248         .removexattr    = generic_removexattr,
6249 };
6250
6251 const struct nfs_rpc_ops nfs_v4_clientops = {
6252         .version        = 4,                    /* protocol version */
6253         .dentry_ops     = &nfs4_dentry_operations,
6254         .dir_inode_ops  = &nfs4_dir_inode_operations,
6255         .file_inode_ops = &nfs4_file_inode_operations,
6256         .file_ops       = &nfs4_file_operations,
6257         .getroot        = nfs4_proc_get_root,
6258         .getattr        = nfs4_proc_getattr,
6259         .setattr        = nfs4_proc_setattr,
6260         .lookup         = nfs4_proc_lookup,
6261         .access         = nfs4_proc_access,
6262         .readlink       = nfs4_proc_readlink,
6263         .create         = nfs4_proc_create,
6264         .remove         = nfs4_proc_remove,
6265         .unlink_setup   = nfs4_proc_unlink_setup,
6266         .unlink_done    = nfs4_proc_unlink_done,
6267         .rename         = nfs4_proc_rename,
6268         .rename_setup   = nfs4_proc_rename_setup,
6269         .rename_done    = nfs4_proc_rename_done,
6270         .link           = nfs4_proc_link,
6271         .symlink        = nfs4_proc_symlink,
6272         .mkdir          = nfs4_proc_mkdir,
6273         .rmdir          = nfs4_proc_remove,
6274         .readdir        = nfs4_proc_readdir,
6275         .mknod          = nfs4_proc_mknod,
6276         .statfs         = nfs4_proc_statfs,
6277         .fsinfo         = nfs4_proc_fsinfo,
6278         .pathconf       = nfs4_proc_pathconf,
6279         .set_capabilities = nfs4_server_capabilities,
6280         .decode_dirent  = nfs4_decode_dirent,
6281         .read_setup     = nfs4_proc_read_setup,
6282         .read_done      = nfs4_read_done,
6283         .write_setup    = nfs4_proc_write_setup,
6284         .write_done     = nfs4_write_done,
6285         .commit_setup   = nfs4_proc_commit_setup,
6286         .commit_done    = nfs4_commit_done,
6287         .lock           = nfs4_proc_lock,
6288         .clear_acl_cache = nfs4_zap_acl_attr,
6289         .close_context  = nfs4_close_context,
6290         .open_context   = nfs4_atomic_open,
6291         .init_client    = nfs4_init_client,
6292         .secinfo        = nfs4_proc_secinfo,
6293 };
6294
6295 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6296         .prefix = XATTR_NAME_NFSV4_ACL,
6297         .list   = nfs4_xattr_list_nfs4_acl,
6298         .get    = nfs4_xattr_get_nfs4_acl,
6299         .set    = nfs4_xattr_set_nfs4_acl,
6300 };
6301
6302 const struct xattr_handler *nfs4_xattr_handlers[] = {
6303         &nfs4_xattr_nfs4_acl_handler,
6304         NULL
6305 };
6306
6307 /*
6308  * Local variables:
6309  *  c-basic-offset: 8
6310  * End:
6311  */