fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/sunrpc/bc_xprt.h>
  56 #include <linux/xattr.h>
  57 #include <linux/utsname.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65
  66 #define NFSDBG_FACILITY         NFSDBG_PROC
  67
  68 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  69 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  70
  71 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  72
  73 struct nfs4_opendata;
  74 static int _nfs4_proc_open(struct nfs4_opendata *data);
  75 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  76 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  77 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  78 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  79 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  80                             struct nfs_fattr *fattr, struct iattr *sattr,
  81                             struct nfs4_state *state);
  82 #ifdef CONFIG_NFS_V4_1
  83 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  84 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  85 #endif
  86 /* Prevent leaks of NFSv4 errors into userland */
  87 static int nfs4_map_errors(int err)
  88 {
  89         if (err >= -1000)
  90                 return err;
  91         switch (err) {
  92         case -NFS4ERR_RESOURCE:
  93                 return -EREMOTEIO;
  94         case -NFS4ERR_WRONGSEC:
  95                 return -EPERM;
  96         case -NFS4ERR_BADOWNER:
  97         case -NFS4ERR_BADNAME:
  98                 return -EINVAL;
  99         default:
 100                 dprintk("%s could not handle NFSv4 error %d\n",
 101                                 __func__, -err);
 102                 break;
 103         }
 104         return -EIO;
 105 }
 106
 107 /*
 108  * This is our standard bitmap for GETATTR requests.
 109  */
 110 const u32 nfs4_fattr_bitmap[2] = {
 111         FATTR4_WORD0_TYPE
 112         | FATTR4_WORD0_CHANGE
 113         | FATTR4_WORD0_SIZE
 114         | FATTR4_WORD0_FSID
 115         | FATTR4_WORD0_FILEID,
 116         FATTR4_WORD1_MODE
 117         | FATTR4_WORD1_NUMLINKS
 118         | FATTR4_WORD1_OWNER
 119         | FATTR4_WORD1_OWNER_GROUP
 120         | FATTR4_WORD1_RAWDEV
 121         | FATTR4_WORD1_SPACE_USED
 122         | FATTR4_WORD1_TIME_ACCESS
 123         | FATTR4_WORD1_TIME_METADATA
 124         | FATTR4_WORD1_TIME_MODIFY
 125 };
 126
 127 const u32 nfs4_statfs_bitmap[2] = {
 128         FATTR4_WORD0_FILES_AVAIL
 129         | FATTR4_WORD0_FILES_FREE
 130         | FATTR4_WORD0_FILES_TOTAL,
 131         FATTR4_WORD1_SPACE_AVAIL
 132         | FATTR4_WORD1_SPACE_FREE
 133         | FATTR4_WORD1_SPACE_TOTAL
 134 };
 135
 136 const u32 nfs4_pathconf_bitmap[2] = {
 137         FATTR4_WORD0_MAXLINK
 138         | FATTR4_WORD0_MAXNAME,
 139         0
 140 };
 141
 142 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 143                         | FATTR4_WORD0_MAXREAD
 144                         | FATTR4_WORD0_MAXWRITE
 145                         | FATTR4_WORD0_LEASE_TIME,
 146                         FATTR4_WORD1_TIME_DELTA
 147                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 148                         FATTR4_WORD2_LAYOUT_BLKSIZE
 149 };
 150
 151 const u32 nfs4_fs_locations_bitmap[2] = {
 152         FATTR4_WORD0_TYPE
 153         | FATTR4_WORD0_CHANGE
 154         | FATTR4_WORD0_SIZE
 155         | FATTR4_WORD0_FSID
 156         | FATTR4_WORD0_FILEID
 157         | FATTR4_WORD0_FS_LOCATIONS,
 158         FATTR4_WORD1_MODE
 159         | FATTR4_WORD1_NUMLINKS
 160         | FATTR4_WORD1_OWNER
 161         | FATTR4_WORD1_OWNER_GROUP
 162         | FATTR4_WORD1_RAWDEV
 163         | FATTR4_WORD1_SPACE_USED
 164         | FATTR4_WORD1_TIME_ACCESS
 165         | FATTR4_WORD1_TIME_METADATA
 166         | FATTR4_WORD1_TIME_MODIFY
 167         | FATTR4_WORD1_MOUNTED_ON_FILEID
 168 };
 169
 170 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 171                 struct nfs4_readdir_arg *readdir)
 172 {
 173         __be32 *start, *p;
 174
 175         BUG_ON(readdir->count < 80);
 176         if (cookie > 2) {
 177                 readdir->cookie = cookie;
 178                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 179                 return;
 180         }
 181
 182         readdir->cookie = 0;
 183         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 184         if (cookie == 2)
 185                 return;
 186
 187         /*
 188          * NFSv4 servers do not return entries for '.' and '..'
 189          * Therefore, we fake these entries here.  We let '.'
 190          * have cookie 0 and '..' have cookie 1.  Note that
 191          * when talking to the server, we always send cookie 0
 192          * instead of 1 or 2.
 193          */
 194         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 195
 196         if (cookie == 0) {
 197                 *p++ = xdr_one;                                  /* next */
 198                 *p++ = xdr_zero;                   /* cookie, first word */
 199                 *p++ = xdr_one;                   /* cookie, second word */
 200                 *p++ = xdr_one;                             /* entry len */
 201                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 202                 p++;
 203                 *p++ = xdr_one;                         /* bitmap length */
 204                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 205                 *p++ = htonl(8);              /* attribute buffer length */
 206                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 207         }
 208
 209         *p++ = xdr_one;                                  /* next */
 210         *p++ = xdr_zero;                   /* cookie, first word */
 211         *p++ = xdr_two;                   /* cookie, second word */
 212         *p++ = xdr_two;                             /* entry len */
 213         memcpy(p, "..\0\0", 4);                         /* entry */
 214         p++;
 215         *p++ = xdr_one;                         /* bitmap length */
 216         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 217         *p++ = htonl(8);              /* attribute buffer length */
 218         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 219
 220         readdir->pgbase = (char *)p - (char *)start;
 221         readdir->count -= readdir->pgbase;
 222         kunmap_atomic(start, KM_USER0);
 223 }
 224
 225 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 226 {
 227         int res;
 228
 229         might_sleep();
 230
 231         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 232                         nfs_wait_bit_killable, TASK_KILLABLE);
 233         return res;
 234 }
 235
 236 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 237 {
 238         int res = 0;
 239
 240         might_sleep();
 241
 242         if (*timeout <= 0)
 243                 *timeout = NFS4_POLL_RETRY_MIN;
 244         if (*timeout > NFS4_POLL_RETRY_MAX)
 245                 *timeout = NFS4_POLL_RETRY_MAX;
 246         schedule_timeout_killable(*timeout);
 247         if (fatal_signal_pending(current))
 248                 res = -ERESTARTSYS;
 249         *timeout <<= 1;
 250         return res;
 251 }
 252
 253 /* This is the error handling routine for processes that are allowed
 254  * to sleep.
 255  */
 256 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 257 {
 258         struct nfs_client *clp = server->nfs_client;
 259         struct nfs4_state *state = exception->state;
 260         struct inode *inode = exception->inode;
 261         int ret = errorcode;
 262
 263         exception->retry = 0;
 264         switch(errorcode) {
 265                 case 0:
 266                         return 0;
 267                 case -NFS4ERR_OPENMODE:
 268                         if (nfs_have_delegation(inode, FMODE_READ)) {
 269                                 nfs_inode_return_delegation(inode);
 270                                 exception->retry = 1;
 271                                 return 0;
 272                         }
 273                         if (state == NULL)
 274                                 break;
 275                         nfs4_schedule_stateid_recovery(server, state);
 276                         goto wait_on_recovery;
 277                 case -NFS4ERR_DELEG_REVOKED:
 278                 case -NFS4ERR_ADMIN_REVOKED:
 279                 case -NFS4ERR_BAD_STATEID:
 280                         if (state != NULL)
 281                                 nfs_remove_bad_delegation(state->inode);
 282                         if (state == NULL)
 283                                 break;
 284                         nfs4_schedule_stateid_recovery(server, state);
 285                         goto wait_on_recovery;
 286                 case -NFS4ERR_EXPIRED:
 287                         if (state != NULL)
 288                                 nfs4_schedule_stateid_recovery(server, state);
 289                 case -NFS4ERR_STALE_STATEID:
 290                 case -NFS4ERR_STALE_CLIENTID:
 291                         nfs4_schedule_lease_recovery(clp);
 292                         goto wait_on_recovery;
 293 #if defined(CONFIG_NFS_V4_1)
 294                 case -NFS4ERR_BADSESSION:
 295                 case -NFS4ERR_BADSLOT:
 296                 case -NFS4ERR_BAD_HIGH_SLOT:
 297                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 298                 case -NFS4ERR_DEADSESSION:
 299                 case -NFS4ERR_SEQ_FALSE_RETRY:
 300                 case -NFS4ERR_SEQ_MISORDERED:
 301                         dprintk("%s ERROR: %d Reset session\n", __func__,
 302                                 errorcode);
 303                         nfs4_schedule_session_recovery(clp->cl_session);
 304                         exception->retry = 1;
 305                         break;
 306 #endif /* defined(CONFIG_NFS_V4_1) */
 307                 case -NFS4ERR_FILE_OPEN:
 308                         if (exception->timeout > HZ) {
 309                                 /* We have retried a decent amount, time to
 310                                  * fail
 311                                  */
 312                                 ret = -EBUSY;
 313                                 break;
 314                         }
 315                 case -NFS4ERR_GRACE:
 316                 case -NFS4ERR_DELAY:
 317                 case -EKEYEXPIRED:
 318                         ret = nfs4_delay(server->client, &exception->timeout);
 319                         if (ret != 0)
 320                                 break;
 321                 case -NFS4ERR_RETRY_UNCACHED_REP:
 322                 case -NFS4ERR_OLD_STATEID:
 323                         exception->retry = 1;
 324                         break;
 325                 case -NFS4ERR_BADOWNER:
 326                         /* The following works around a Linux server bug! */
 327                 case -NFS4ERR_BADNAME:
 328                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 329                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 330                                 exception->retry = 1;
 331                                 printk(KERN_WARNING "NFS: v4 server %s "
 332                                                 "does not accept raw "
 333                                                 "uid/gids. "
 334                                                 "Reenabling the idmapper.\n",
 335                                                 server->nfs_client->cl_hostname);
 336                         }
 337         }
 338         /* We failed to handle the error */
 339         return nfs4_map_errors(ret);
 340 wait_on_recovery:
 341         ret = nfs4_wait_clnt_recover(clp);
 342         if (ret == 0)
 343                 exception->retry = 1;
 344         return ret;
 345 }
 346
 347
 348 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 349 {
 350         spin_lock(&clp->cl_lock);
 351         if (time_before(clp->cl_last_renewal,timestamp))
 352                 clp->cl_last_renewal = timestamp;
 353         spin_unlock(&clp->cl_lock);
 354 }
 355
 356 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 357 {
 358         do_renew_lease(server->nfs_client, timestamp);
 359 }
 360
 361 #if defined(CONFIG_NFS_V4_1)
 362
 363 /*
 364  * nfs4_free_slot - free a slot and efficiently update slot table.
 365  *
 366  * freeing a slot is trivially done by clearing its respective bit
 367  * in the bitmap.
 368  * If the freed slotid equals highest_used_slotid we want to update it
 369  * so that the server would be able to size down the slot table if needed,
 370  * otherwise we know that the highest_used_slotid is still in use.
 371  * When updating highest_used_slotid there may be "holes" in the bitmap
 372  * so we need to scan down from highest_used_slotid to 0 looking for the now
 373  * highest slotid in use.
 374  * If none found, highest_used_slotid is set to -1.
 375  *
 376  * Must be called while holding tbl->slot_tbl_lock
 377  */
 378 static void
 379 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 380 {
 381         int free_slotid = free_slot - tbl->slots;
 382         int slotid = free_slotid;
 383
 384         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 385         /* clear used bit in bitmap */
 386         __clear_bit(slotid, tbl->used_slots);
 387
 388         /* update highest_used_slotid when it is freed */
 389         if (slotid == tbl->highest_used_slotid) {
 390                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 391                 if (slotid < tbl->max_slots)
 392                         tbl->highest_used_slotid = slotid;
 393                 else
 394                         tbl->highest_used_slotid = -1;
 395         }
 396         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 397                 free_slotid, tbl->highest_used_slotid);
 398 }
 399
 400 /*
 401  * Signal state manager thread if session fore channel is drained
 402  */
 403 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 404 {
 405         struct rpc_task *task;
 406
 407         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 408                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 409                 if (task)
 410                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 411                 return;
 412         }
 413
 414         if (ses->fc_slot_table.highest_used_slotid != -1)
 415                 return;
 416
 417         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 418         complete(&ses->fc_slot_table.complete);
 419 }
 420
 421 /*
 422  * Signal state manager thread if session back channel is drained
 423  */
 424 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 425 {
 426         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 427             ses->bc_slot_table.highest_used_slotid != -1)
 428                 return;
 429         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 430         complete(&ses->bc_slot_table.complete);
 431 }
 432
 433 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 434 {
 435         struct nfs4_slot_table *tbl;
 436
 437         tbl = &res->sr_session->fc_slot_table;
 438         if (!res->sr_slot) {
 439                 /* just wake up the next guy waiting since
 440                  * we may have not consumed a slot after all */
 441                 dprintk("%s: No slot\n", __func__);
 442                 return;
 443         }
 444
 445         spin_lock(&tbl->slot_tbl_lock);
 446         nfs4_free_slot(tbl, res->sr_slot);
 447         nfs4_check_drain_fc_complete(res->sr_session);
 448         spin_unlock(&tbl->slot_tbl_lock);
 449         res->sr_slot = NULL;
 450 }
 451
 452 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 453 {
 454         unsigned long timestamp;
 455         struct nfs_client *clp;
 456
 457         /*
 458          * sr_status remains 1 if an RPC level error occurred. The server
 459          * may or may not have processed the sequence operation..
 460          * Proceed as if the server received and processed the sequence
 461          * operation.
 462          */
 463         if (res->sr_status == 1)
 464                 res->sr_status = NFS_OK;
 465
 466         /* don't increment the sequence number if the task wasn't sent */
 467         if (!RPC_WAS_SENT(task))
 468                 goto out;
 469
 470         /* Check the SEQUENCE operation status */
 471         switch (res->sr_status) {
 472         case 0:
 473                 /* Update the slot's sequence and clientid lease timer */
 474                 ++res->sr_slot->seq_nr;
 475                 timestamp = res->sr_renewal_time;
 476                 clp = res->sr_session->clp;
 477                 do_renew_lease(clp, timestamp);
 478                 /* Check sequence flags */
 479                 if (res->sr_status_flags != 0)
 480                         nfs4_schedule_lease_recovery(clp);
 481                 break;
 482         case -NFS4ERR_DELAY:
 483                 /* The server detected a resend of the RPC call and
 484                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 485                  * of RFC5661.
 486                  */
 487                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 488                         __func__,
 489                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 490                         res->sr_slot->seq_nr);
 491                 goto out_retry;
 492         default:
 493                 /* Just update the slot sequence no. */
 494                 ++res->sr_slot->seq_nr;
 495         }
 496 out:
 497         /* The session may be reset by one of the error handlers. */
 498         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 499         nfs41_sequence_free_slot(res);
 500         return 1;
 501 out_retry:
 502         if (!rpc_restart_call(task))
 503                 goto out;
 504         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 505         return 0;
 506 }
 507
 508 static int nfs4_sequence_done(struct rpc_task *task,
 509                                struct nfs4_sequence_res *res)
 510 {
 511         if (res->sr_session == NULL)
 512                 return 1;
 513         return nfs41_sequence_done(task, res);
 514 }
 515
 516 /*
 517  * nfs4_find_slot - efficiently look for a free slot
 518  *
 519  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 520  * If found, we mark the slot as used, update the highest_used_slotid,
 521  * and respectively set up the sequence operation args.
 522  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 523  *
 524  * Note: must be called with under the slot_tbl_lock.
 525  */
 526 static u8
 527 nfs4_find_slot(struct nfs4_slot_table *tbl)
 528 {
 529         int slotid;
 530         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 531         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 532
 533         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 534                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 535                 tbl->max_slots);
 536         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 537         if (slotid >= tbl->max_slots)
 538                 goto out;
 539         __set_bit(slotid, tbl->used_slots);
 540         if (slotid > tbl->highest_used_slotid)
 541                 tbl->highest_used_slotid = slotid;
 542         ret_id = slotid;
 543 out:
 544         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 545                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 546         return ret_id;
 547 }
 548
 549 int nfs41_setup_sequence(struct nfs4_session *session,
 550                                 struct nfs4_sequence_args *args,
 551                                 struct nfs4_sequence_res *res,
 552                                 int cache_reply,
 553                                 struct rpc_task *task)
 554 {
 555         struct nfs4_slot *slot;
 556         struct nfs4_slot_table *tbl;
 557         u8 slotid;
 558
 559         dprintk("--> %s\n", __func__);
 560         /* slot already allocated? */
 561         if (res->sr_slot != NULL)
 562                 return 0;
 563
 564         tbl = &session->fc_slot_table;
 565
 566         spin_lock(&tbl->slot_tbl_lock);
 567         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 568             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 569                 /*
 570                  * The state manager will wait until the slot table is empty.
 571                  * Schedule the reset thread
 572                  */
 573                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 574                 spin_unlock(&tbl->slot_tbl_lock);
 575                 dprintk("%s Schedule Session Reset\n", __func__);
 576                 return -EAGAIN;
 577         }
 578
 579         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 580             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 581                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 582                 spin_unlock(&tbl->slot_tbl_lock);
 583                 dprintk("%s enforce FIFO order\n", __func__);
 584                 return -EAGAIN;
 585         }
 586
 587         slotid = nfs4_find_slot(tbl);
 588         if (slotid == NFS4_MAX_SLOT_TABLE) {
 589                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 590                 spin_unlock(&tbl->slot_tbl_lock);
 591                 dprintk("<-- %s: no free slots\n", __func__);
 592                 return -EAGAIN;
 593         }
 594         spin_unlock(&tbl->slot_tbl_lock);
 595
 596         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 597         slot = tbl->slots + slotid;
 598         args->sa_session = session;
 599         args->sa_slotid = slotid;
 600         args->sa_cache_this = cache_reply;
 601
 602         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 603
 604         res->sr_session = session;
 605         res->sr_slot = slot;
 606         res->sr_renewal_time = jiffies;
 607         res->sr_status_flags = 0;
 608         /*
 609          * sr_status is only set in decode_sequence, and so will remain
 610          * set to 1 if an rpc level failure occurs.
 611          */
 612         res->sr_status = 1;
 613         return 0;
 614 }
 615 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 616
 617 int nfs4_setup_sequence(const struct nfs_server *server,
 618                         struct nfs4_sequence_args *args,
 619                         struct nfs4_sequence_res *res,
 620                         int cache_reply,
 621                         struct rpc_task *task)
 622 {
 623         struct nfs4_session *session = nfs4_get_session(server);
 624         int ret = 0;
 625
 626         if (session == NULL) {
 627                 args->sa_session = NULL;
 628                 res->sr_session = NULL;
 629                 goto out;
 630         }
 631
 632         dprintk("--> %s clp %p session %p sr_slot %td\n",
 633                 __func__, session->clp, session, res->sr_slot ?
 634                         res->sr_slot - session->fc_slot_table.slots : -1);
 635
 636         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 637                                    task);
 638 out:
 639         dprintk("<-- %s status=%d\n", __func__, ret);
 640         return ret;
 641 }
 642
 643 struct nfs41_call_sync_data {
 644         const struct nfs_server *seq_server;
 645         struct nfs4_sequence_args *seq_args;
 646         struct nfs4_sequence_res *seq_res;
 647         int cache_reply;
 648 };
 649
 650 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 651 {
 652         struct nfs41_call_sync_data *data = calldata;
 653
 654         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 655
 656         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 657                                 data->seq_res, data->cache_reply, task))
 658                 return;
 659         rpc_call_start(task);
 660 }
 661
 662 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 663 {
 664         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 665         nfs41_call_sync_prepare(task, calldata);
 666 }
 667
 668 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 669 {
 670         struct nfs41_call_sync_data *data = calldata;
 671
 672         nfs41_sequence_done(task, data->seq_res);
 673 }
 674
 675 struct rpc_call_ops nfs41_call_sync_ops = {
 676         .rpc_call_prepare = nfs41_call_sync_prepare,
 677         .rpc_call_done = nfs41_call_sync_done,
 678 };
 679
 680 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 681         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 682         .rpc_call_done = nfs41_call_sync_done,
 683 };
 684
 685 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 686                                    struct nfs_server *server,
 687                                    struct rpc_message *msg,
 688                                    struct nfs4_sequence_args *args,
 689                                    struct nfs4_sequence_res *res,
 690                                    int cache_reply,
 691                                    int privileged)
 692 {
 693         int ret;
 694         struct rpc_task *task;
 695         struct nfs41_call_sync_data data = {
 696                 .seq_server = server,
 697                 .seq_args = args,
 698                 .seq_res = res,
 699                 .cache_reply = cache_reply,
 700         };
 701         struct rpc_task_setup task_setup = {
 702                 .rpc_client = clnt,
 703                 .rpc_message = msg,
 704                 .callback_ops = &nfs41_call_sync_ops,
 705                 .callback_data = &data
 706         };
 707
 708         res->sr_slot = NULL;
 709         if (privileged)
 710                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 711         task = rpc_run_task(&task_setup);
 712         if (IS_ERR(task))
 713                 ret = PTR_ERR(task);
 714         else {
 715                 ret = task->tk_status;
 716                 rpc_put_task(task);
 717         }
 718         return ret;
 719 }
 720
 721 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 722                             struct nfs_server *server,
 723                             struct rpc_message *msg,
 724                             struct nfs4_sequence_args *args,
 725                             struct nfs4_sequence_res *res,
 726                             int cache_reply)
 727 {
 728         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 729 }
 730
 731 #else
 732 static int nfs4_sequence_done(struct rpc_task *task,
 733                                struct nfs4_sequence_res *res)
 734 {
 735         return 1;
 736 }
 737 #endif /* CONFIG_NFS_V4_1 */
 738
 739 int _nfs4_call_sync(struct rpc_clnt *clnt,
 740                     struct nfs_server *server,
 741                     struct rpc_message *msg,
 742                     struct nfs4_sequence_args *args,
 743                     struct nfs4_sequence_res *res,
 744                     int cache_reply)
 745 {
 746         args->sa_session = res->sr_session = NULL;
 747         return rpc_call_sync(clnt, msg, 0);
 748 }
 749
 750 static inline
 751 int nfs4_call_sync(struct rpc_clnt *clnt,
 752                    struct nfs_server *server,
 753                    struct rpc_message *msg,
 754                    struct nfs4_sequence_args *args,
 755                    struct nfs4_sequence_res *res,
 756                    int cache_reply)
 757 {
 758         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 759                                                 args, res, cache_reply);
 760 }
 761
 762 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 763 {
 764         struct nfs_inode *nfsi = NFS_I(dir);
 765
 766         spin_lock(&dir->i_lock);
 767         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 768         if (!cinfo->atomic || cinfo->before != dir->i_version)
 769                 nfs_force_lookup_revalidate(dir);
 770         dir->i_version = cinfo->after;
 771         spin_unlock(&dir->i_lock);
 772 }
 773
 774 struct nfs4_opendata {
 775         struct kref kref;
 776         struct nfs_openargs o_arg;
 777         struct nfs_openres o_res;
 778         struct nfs_open_confirmargs c_arg;
 779         struct nfs_open_confirmres c_res;
 780         struct nfs_fattr f_attr;
 781         struct nfs_fattr dir_attr;
 782         struct dentry *dir;
 783         struct dentry *dentry;
 784         struct nfs4_state_owner *owner;
 785         struct nfs4_state *state;
 786         struct iattr attrs;
 787         unsigned long timestamp;
 788         unsigned int rpc_done : 1;
 789         int rpc_status;
 790         int cancelled;
 791 };
 792
 793
 794 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 795 {
 796         p->o_res.f_attr = &p->f_attr;
 797         p->o_res.dir_attr = &p->dir_attr;
 798         p->o_res.seqid = p->o_arg.seqid;
 799         p->c_res.seqid = p->c_arg.seqid;
 800         p->o_res.server = p->o_arg.server;
 801         nfs_fattr_init(&p->f_attr);
 802         nfs_fattr_init(&p->dir_attr);
 803 }
 804
 805 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 806                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 807                 const struct iattr *attrs,
 808                 gfp_t gfp_mask)
 809 {
 810         struct dentry *parent = dget_parent(dentry);
 811         struct inode *dir = parent->d_inode;
 812         struct nfs_server *server = NFS_SERVER(dir);
 813         struct nfs4_opendata *p;
 814
 815         p = kzalloc(sizeof(*p), gfp_mask);
 816         if (p == NULL)
 817                 goto err;
 818         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 819         if (p->o_arg.seqid == NULL)
 820                 goto err_free;
 821         nfs_sb_active(dentry->d_sb);
 822         p->dentry = dget(dentry);
 823         p->dir = parent;
 824         p->owner = sp;
 825         atomic_inc(&sp->so_count);
 826         p->o_arg.fh = NFS_FH(dir);
 827         p->o_arg.open_flags = flags;
 828         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 829         p->o_arg.clientid = server->nfs_client->cl_clientid;
 830         p->o_arg.id = sp->so_owner_id.id;
 831         p->o_arg.name = &dentry->d_name;
 832         p->o_arg.server = server;
 833         p->o_arg.bitmask = server->attr_bitmask;
 834         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 835         if (flags & O_CREAT) {
 836                 u32 *s;
 837
 838                 p->o_arg.u.attrs = &p->attrs;
 839                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 840                 s = (u32 *) p->o_arg.u.verifier.data;
 841                 s[0] = jiffies;
 842                 s[1] = current->pid;
 843         }
 844         p->c_arg.fh = &p->o_res.fh;
 845         p->c_arg.stateid = &p->o_res.stateid;
 846         p->c_arg.seqid = p->o_arg.seqid;
 847         nfs4_init_opendata_res(p);
 848         kref_init(&p->kref);
 849         return p;
 850 err_free:
 851         kfree(p);
 852 err:
 853         dput(parent);
 854         return NULL;
 855 }
 856
 857 static void nfs4_opendata_free(struct kref *kref)
 858 {
 859         struct nfs4_opendata *p = container_of(kref,
 860                         struct nfs4_opendata, kref);
 861         struct super_block *sb = p->dentry->d_sb;
 862
 863         nfs_free_seqid(p->o_arg.seqid);
 864         if (p->state != NULL)
 865                 nfs4_put_open_state(p->state);
 866         nfs4_put_state_owner(p->owner);
 867         dput(p->dir);
 868         dput(p->dentry);
 869         nfs_sb_deactive(sb);
 870         kfree(p);
 871 }
 872
 873 static void nfs4_opendata_put(struct nfs4_opendata *p)
 874 {
 875         if (p != NULL)
 876                 kref_put(&p->kref, nfs4_opendata_free);
 877 }
 878
 879 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 880 {
 881         int ret;
 882
 883         ret = rpc_wait_for_completion_task(task);
 884         return ret;
 885 }
 886
 887 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 888 {
 889         int ret = 0;
 890
 891         if (open_mode & O_EXCL)
 892                 goto out;
 893         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 894                 case FMODE_READ:
 895                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 896                                 && state->n_rdonly != 0;
 897                         break;
 898                 case FMODE_WRITE:
 899                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 900                                 && state->n_wronly != 0;
 901                         break;
 902                 case FMODE_READ|FMODE_WRITE:
 903                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 904                                 && state->n_rdwr != 0;
 905         }
 906 out:
 907         return ret;
 908 }
 909
 910 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 911 {
 912         if (delegation == NULL)
 913                 return 0;
 914         if ((delegation->type & fmode) != fmode)
 915                 return 0;
 916         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 917                 return 0;
 918         nfs_mark_delegation_referenced(delegation);
 919         return 1;
 920 }
 921
 922 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 923 {
 924         switch (fmode) {
 925                 case FMODE_WRITE:
 926                         state->n_wronly++;
 927                         break;
 928                 case FMODE_READ:
 929                         state->n_rdonly++;
 930                         break;
 931                 case FMODE_READ|FMODE_WRITE:
 932                         state->n_rdwr++;
 933         }
 934         nfs4_state_set_mode_locked(state, state->state | fmode);
 935 }
 936
 937 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 938 {
 939         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 940                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 941         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 942         switch (fmode) {
 943                 case FMODE_READ:
 944                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 945                         break;
 946                 case FMODE_WRITE:
 947                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 948                         break;
 949                 case FMODE_READ|FMODE_WRITE:
 950                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 951         }
 952 }
 953
 954 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 955 {
 956         write_seqlock(&state->seqlock);
 957         nfs_set_open_stateid_locked(state, stateid, fmode);
 958         write_sequnlock(&state->seqlock);
 959 }
 960
 961 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 962 {
 963         /*
 964          * Protect the call to nfs4_state_set_mode_locked and
 965          * serialise the stateid update
 966          */
 967         write_seqlock(&state->seqlock);
 968         if (deleg_stateid != NULL) {
 969                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 970                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 971         }
 972         if (open_stateid != NULL)
 973                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 974         write_sequnlock(&state->seqlock);
 975         spin_lock(&state->owner->so_lock);
 976         update_open_stateflags(state, fmode);
 977         spin_unlock(&state->owner->so_lock);
 978 }
 979
 980 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 981 {
 982         struct nfs_inode *nfsi = NFS_I(state->inode);
 983         struct nfs_delegation *deleg_cur;
 984         int ret = 0;
 985
 986         fmode &= (FMODE_READ|FMODE_WRITE);
 987
 988         rcu_read_lock();
 989         deleg_cur = rcu_dereference(nfsi->delegation);
 990         if (deleg_cur == NULL)
 991                 goto no_delegation;
 992
 993         spin_lock(&deleg_cur->lock);
 994         if (nfsi->delegation != deleg_cur ||
 995             (deleg_cur->type & fmode) != fmode)
 996                 goto no_delegation_unlock;
 997
 998         if (delegation == NULL)
 999                 delegation = &deleg_cur->stateid;
1000         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
1001                 goto no_delegation_unlock;
1002
1003         nfs_mark_delegation_referenced(deleg_cur);
1004         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1005         ret = 1;
1006 no_delegation_unlock:
1007         spin_unlock(&deleg_cur->lock);
1008 no_delegation:
1009         rcu_read_unlock();
1010
1011         if (!ret && open_stateid != NULL) {
1012                 __update_open_stateid(state, open_stateid, NULL, fmode);
1013                 ret = 1;
1014         }
1015
1016         return ret;
1017 }
1018
1019
1020 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1021 {
1022         struct nfs_delegation *delegation;
1023
1024         rcu_read_lock();
1025         delegation = rcu_dereference(NFS_I(inode)->delegation);
1026         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1027                 rcu_read_unlock();
1028                 return;
1029         }
1030         rcu_read_unlock();
1031         nfs_inode_return_delegation(inode);
1032 }
1033
1034 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1035 {
1036         struct nfs4_state *state = opendata->state;
1037         struct nfs_inode *nfsi = NFS_I(state->inode);
1038         struct nfs_delegation *delegation;
1039         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1040         fmode_t fmode = opendata->o_arg.fmode;
1041         nfs4_stateid stateid;
1042         int ret = -EAGAIN;
1043
1044         for (;;) {
1045                 if (can_open_cached(state, fmode, open_mode)) {
1046                         spin_lock(&state->owner->so_lock);
1047                         if (can_open_cached(state, fmode, open_mode)) {
1048                                 update_open_stateflags(state, fmode);
1049                                 spin_unlock(&state->owner->so_lock);
1050                                 goto out_return_state;
1051                         }
1052                         spin_unlock(&state->owner->so_lock);
1053                 }
1054                 rcu_read_lock();
1055                 delegation = rcu_dereference(nfsi->delegation);
1056                 if (!can_open_delegated(delegation, fmode)) {
1057                         rcu_read_unlock();
1058                         break;
1059                 }
1060                 /* Save the delegation */
1061                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1062                 rcu_read_unlock();
1063                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1064                 if (ret != 0)
1065                         goto out;
1066                 ret = -EAGAIN;
1067
1068                 /* Try to update the stateid using the delegation */
1069                 if (update_open_stateid(state, NULL, &stateid, fmode))
1070                         goto out_return_state;
1071         }
1072 out:
1073         return ERR_PTR(ret);
1074 out_return_state:
1075         atomic_inc(&state->count);
1076         return state;
1077 }
1078
1079 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1080 {
1081         struct inode *inode;
1082         struct nfs4_state *state = NULL;
1083         struct nfs_delegation *delegation;
1084         int ret;
1085
1086         if (!data->rpc_done) {
1087                 state = nfs4_try_open_cached(data);
1088                 goto out;
1089         }
1090
1091         ret = -EAGAIN;
1092         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1093                 goto err;
1094         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1095         ret = PTR_ERR(inode);
1096         if (IS_ERR(inode))
1097                 goto err;
1098         ret = -ENOMEM;
1099         state = nfs4_get_open_state(inode, data->owner);
1100         if (state == NULL)
1101                 goto err_put_inode;
1102         if (data->o_res.delegation_type != 0) {
1103                 int delegation_flags = 0;
1104
1105                 rcu_read_lock();
1106                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1107                 if (delegation)
1108                         delegation_flags = delegation->flags;
1109                 rcu_read_unlock();
1110                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1111                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1112                                         "returning a delegation for "
1113                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1114                                         NFS_CLIENT(inode)->cl_server);
1115                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1116                         nfs_inode_set_delegation(state->inode,
1117                                         data->owner->so_cred,
1118                                         &data->o_res);
1119                 else
1120                         nfs_inode_reclaim_delegation(state->inode,
1121                                         data->owner->so_cred,
1122                                         &data->o_res);
1123         }
1124
1125         update_open_stateid(state, &data->o_res.stateid, NULL,
1126                         data->o_arg.fmode);
1127         iput(inode);
1128 out:
1129         return state;
1130 err_put_inode:
1131         iput(inode);
1132 err:
1133         return ERR_PTR(ret);
1134 }
1135
1136 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1137 {
1138         struct nfs_inode *nfsi = NFS_I(state->inode);
1139         struct nfs_open_context *ctx;
1140
1141         spin_lock(&state->inode->i_lock);
1142         list_for_each_entry(ctx, &nfsi->open_files, list) {
1143                 if (ctx->state != state)
1144                         continue;
1145                 get_nfs_open_context(ctx);
1146                 spin_unlock(&state->inode->i_lock);
1147                 return ctx;
1148         }
1149         spin_unlock(&state->inode->i_lock);
1150         return ERR_PTR(-ENOENT);
1151 }
1152
1153 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1154 {
1155         struct nfs4_opendata *opendata;
1156
1157         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1158         if (opendata == NULL)
1159                 return ERR_PTR(-ENOMEM);
1160         opendata->state = state;
1161         atomic_inc(&state->count);
1162         return opendata;
1163 }
1164
1165 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1166 {
1167         struct nfs4_state *newstate;
1168         int ret;
1169
1170         opendata->o_arg.open_flags = 0;
1171         opendata->o_arg.fmode = fmode;
1172         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1173         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1174         nfs4_init_opendata_res(opendata);
1175         ret = _nfs4_recover_proc_open(opendata);
1176         if (ret != 0)
1177                 return ret;
1178         newstate = nfs4_opendata_to_nfs4_state(opendata);
1179         if (IS_ERR(newstate))
1180                 return PTR_ERR(newstate);
1181         nfs4_close_state(newstate, fmode);
1182         *res = newstate;
1183         return 0;
1184 }
1185
1186 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1187 {
1188         struct nfs4_state *newstate;
1189         int ret;
1190
1191         /* memory barrier prior to reading state->n_* */
1192         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1193         smp_rmb();
1194         if (state->n_rdwr != 0) {
1195                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1196                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1197                 if (ret != 0)
1198                         return ret;
1199                 if (newstate != state)
1200                         return -ESTALE;
1201         }
1202         if (state->n_wronly != 0) {
1203                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1204                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1205                 if (ret != 0)
1206                         return ret;
1207                 if (newstate != state)
1208                         return -ESTALE;
1209         }
1210         if (state->n_rdonly != 0) {
1211                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1212                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1213                 if (ret != 0)
1214                         return ret;
1215                 if (newstate != state)
1216                         return -ESTALE;
1217         }
1218         /*
1219          * We may have performed cached opens for all three recoveries.
1220          * Check if we need to update the current stateid.
1221          */
1222         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1223             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1224                 write_seqlock(&state->seqlock);
1225                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1226                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1227                 write_sequnlock(&state->seqlock);
1228         }
1229         return 0;
1230 }
1231
1232 /*
1233  * OPEN_RECLAIM:
1234  *      reclaim state on the server after a reboot.
1235  */
1236 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1237 {
1238         struct nfs_delegation *delegation;
1239         struct nfs4_opendata *opendata;
1240         fmode_t delegation_type = 0;
1241         int status;
1242
1243         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1244         if (IS_ERR(opendata))
1245                 return PTR_ERR(opendata);
1246         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1247         opendata->o_arg.fh = NFS_FH(state->inode);
1248         rcu_read_lock();
1249         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1250         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1251                 delegation_type = delegation->type;
1252         rcu_read_unlock();
1253         opendata->o_arg.u.delegation_type = delegation_type;
1254         status = nfs4_open_recover(opendata, state);
1255         nfs4_opendata_put(opendata);
1256         return status;
1257 }
1258
1259 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1260 {
1261         struct nfs_server *server = NFS_SERVER(state->inode);
1262         struct nfs4_exception exception = { };
1263         int err;
1264         do {
1265                 err = _nfs4_do_open_reclaim(ctx, state);
1266                 if (err != -NFS4ERR_DELAY)
1267                         break;
1268                 nfs4_handle_exception(server, err, &exception);
1269         } while (exception.retry);
1270         return err;
1271 }
1272
1273 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1274 {
1275         struct nfs_open_context *ctx;
1276         int ret;
1277
1278         ctx = nfs4_state_find_open_context(state);
1279         if (IS_ERR(ctx))
1280                 return PTR_ERR(ctx);
1281         ret = nfs4_do_open_reclaim(ctx, state);
1282         put_nfs_open_context(ctx);
1283         return ret;
1284 }
1285
1286 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1287 {
1288         struct nfs4_opendata *opendata;
1289         int ret;
1290
1291         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1292         if (IS_ERR(opendata))
1293                 return PTR_ERR(opendata);
1294         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1295         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1296                         sizeof(opendata->o_arg.u.delegation.data));
1297         ret = nfs4_open_recover(opendata, state);
1298         nfs4_opendata_put(opendata);
1299         return ret;
1300 }
1301
1302 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1303 {
1304         struct nfs4_exception exception = { };
1305         struct nfs_server *server = NFS_SERVER(state->inode);
1306         int err;
1307         do {
1308                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1309                 switch (err) {
1310                         case 0:
1311                         case -ENOENT:
1312                         case -ESTALE:
1313                                 goto out;
1314                         case -NFS4ERR_BADSESSION:
1315                         case -NFS4ERR_BADSLOT:
1316                         case -NFS4ERR_BAD_HIGH_SLOT:
1317                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1318                         case -NFS4ERR_DEADSESSION:
1319                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1320                                 goto out;
1321                         case -NFS4ERR_STALE_CLIENTID:
1322                         case -NFS4ERR_STALE_STATEID:
1323                         case -NFS4ERR_EXPIRED:
1324                                 /* Don't recall a delegation if it was lost */
1325                                 nfs4_schedule_lease_recovery(server->nfs_client);
1326                                 goto out;
1327                         case -ERESTARTSYS:
1328                                 /*
1329                                  * The show must go on: exit, but mark the
1330                                  * stateid as needing recovery.
1331                                  */
1332                         case -NFS4ERR_DELEG_REVOKED:
1333                         case -NFS4ERR_ADMIN_REVOKED:
1334                         case -NFS4ERR_BAD_STATEID:
1335                                 nfs_inode_find_state_and_recover(state->inode,
1336                                                 stateid);
1337                                 nfs4_schedule_stateid_recovery(server, state);
1338                         case -EKEYEXPIRED:
1339                                 /*
1340                                  * User RPCSEC_GSS context has expired.
1341                                  * We cannot recover this stateid now, so
1342                                  * skip it and allow recovery thread to
1343                                  * proceed.
1344                                  */
1345                         case -ENOMEM:
1346                                 err = 0;
1347                                 goto out;
1348                 }
1349                 err = nfs4_handle_exception(server, err, &exception);
1350         } while (exception.retry);
1351 out:
1352         return err;
1353 }
1354
1355 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1356 {
1357         struct nfs4_opendata *data = calldata;
1358
1359         data->rpc_status = task->tk_status;
1360         if (data->rpc_status == 0) {
1361                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1362                                 sizeof(data->o_res.stateid.data));
1363                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1364                 renew_lease(data->o_res.server, data->timestamp);
1365                 data->rpc_done = 1;
1366         }
1367 }
1368
1369 static void nfs4_open_confirm_release(void *calldata)
1370 {
1371         struct nfs4_opendata *data = calldata;
1372         struct nfs4_state *state = NULL;
1373
1374         /* If this request hasn't been cancelled, do nothing */
1375         if (data->cancelled == 0)
1376                 goto out_free;
1377         /* In case of error, no cleanup! */
1378         if (!data->rpc_done)
1379                 goto out_free;
1380         state = nfs4_opendata_to_nfs4_state(data);
1381         if (!IS_ERR(state))
1382                 nfs4_close_state(state, data->o_arg.fmode);
1383 out_free:
1384         nfs4_opendata_put(data);
1385 }
1386
1387 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1388         .rpc_call_done = nfs4_open_confirm_done,
1389         .rpc_release = nfs4_open_confirm_release,
1390 };
1391
1392 /*
1393  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1394  */
1395 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1396 {
1397         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1398         struct rpc_task *task;
1399         struct  rpc_message msg = {
1400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1401                 .rpc_argp = &data->c_arg,
1402                 .rpc_resp = &data->c_res,
1403                 .rpc_cred = data->owner->so_cred,
1404         };
1405         struct rpc_task_setup task_setup_data = {
1406                 .rpc_client = server->client,
1407                 .rpc_message = &msg,
1408                 .callback_ops = &nfs4_open_confirm_ops,
1409                 .callback_data = data,
1410                 .workqueue = nfsiod_workqueue,
1411                 .flags = RPC_TASK_ASYNC,
1412         };
1413         int status;
1414
1415         kref_get(&data->kref);
1416         data->rpc_done = 0;
1417         data->rpc_status = 0;
1418         data->timestamp = jiffies;
1419         task = rpc_run_task(&task_setup_data);
1420         if (IS_ERR(task))
1421                 return PTR_ERR(task);
1422         status = nfs4_wait_for_completion_rpc_task(task);
1423         if (status != 0) {
1424                 data->cancelled = 1;
1425                 smp_wmb();
1426         } else
1427                 status = data->rpc_status;
1428         rpc_put_task(task);
1429         return status;
1430 }
1431
1432 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1433 {
1434         struct nfs4_opendata *data = calldata;
1435         struct nfs4_state_owner *sp = data->owner;
1436
1437         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1438                 return;
1439         /*
1440          * Check if we still need to send an OPEN call, or if we can use
1441          * a delegation instead.
1442          */
1443         if (data->state != NULL) {
1444                 struct nfs_delegation *delegation;
1445
1446                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1447                         goto out_no_action;
1448                 rcu_read_lock();
1449                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1450                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1451                     can_open_delegated(delegation, data->o_arg.fmode))
1452                         goto unlock_no_action;
1453                 rcu_read_unlock();
1454         }
1455         /* Update sequence id. */
1456         data->o_arg.id = sp->so_owner_id.id;
1457         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1458         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1459                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1460                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1461         }
1462         data->timestamp = jiffies;
1463         if (nfs4_setup_sequence(data->o_arg.server,
1464                                 &data->o_arg.seq_args,
1465                                 &data->o_res.seq_res, 1, task))
1466                 return;
1467         rpc_call_start(task);
1468         return;
1469 unlock_no_action:
1470         rcu_read_unlock();
1471 out_no_action:
1472         task->tk_action = NULL;
1473
1474 }
1475
1476 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1477 {
1478         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1479         nfs4_open_prepare(task, calldata);
1480 }
1481
1482 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1483 {
1484         struct nfs4_opendata *data = calldata;
1485
1486         data->rpc_status = task->tk_status;
1487
1488         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1489                 return;
1490
1491         if (task->tk_status == 0) {
1492                 switch (data->o_res.f_attr->mode & S_IFMT) {
1493                         case S_IFREG:
1494                                 break;
1495                         case S_IFLNK:
1496                                 data->rpc_status = -ELOOP;
1497                                 break;
1498                         case S_IFDIR:
1499                                 data->rpc_status = -EISDIR;
1500                                 break;
1501                         default:
1502                                 data->rpc_status = -ENOTDIR;
1503                 }
1504                 renew_lease(data->o_res.server, data->timestamp);
1505                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1506                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1507         }
1508         data->rpc_done = 1;
1509 }
1510
1511 static void nfs4_open_release(void *calldata)
1512 {
1513         struct nfs4_opendata *data = calldata;
1514         struct nfs4_state *state = NULL;
1515
1516         /* If this request hasn't been cancelled, do nothing */
1517         if (data->cancelled == 0)
1518                 goto out_free;
1519         /* In case of error, no cleanup! */
1520         if (data->rpc_status != 0 || !data->rpc_done)
1521                 goto out_free;
1522         /* In case we need an open_confirm, no cleanup! */
1523         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1524                 goto out_free;
1525         state = nfs4_opendata_to_nfs4_state(data);
1526         if (!IS_ERR(state))
1527                 nfs4_close_state(state, data->o_arg.fmode);
1528 out_free:
1529         nfs4_opendata_put(data);
1530 }
1531
1532 static const struct rpc_call_ops nfs4_open_ops = {
1533         .rpc_call_prepare = nfs4_open_prepare,
1534         .rpc_call_done = nfs4_open_done,
1535         .rpc_release = nfs4_open_release,
1536 };
1537
1538 static const struct rpc_call_ops nfs4_recover_open_ops = {
1539         .rpc_call_prepare = nfs4_recover_open_prepare,
1540         .rpc_call_done = nfs4_open_done,
1541         .rpc_release = nfs4_open_release,
1542 };
1543
1544 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1545 {
1546         struct inode *dir = data->dir->d_inode;
1547         struct nfs_server *server = NFS_SERVER(dir);
1548         struct nfs_openargs *o_arg = &data->o_arg;
1549         struct nfs_openres *o_res = &data->o_res;
1550         struct rpc_task *task;
1551         struct rpc_message msg = {
1552                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1553                 .rpc_argp = o_arg,
1554                 .rpc_resp = o_res,
1555                 .rpc_cred = data->owner->so_cred,
1556         };
1557         struct rpc_task_setup task_setup_data = {
1558                 .rpc_client = server->client,
1559                 .rpc_message = &msg,
1560                 .callback_ops = &nfs4_open_ops,
1561                 .callback_data = data,
1562                 .workqueue = nfsiod_workqueue,
1563                 .flags = RPC_TASK_ASYNC,
1564         };
1565         int status;
1566
1567         kref_get(&data->kref);
1568         data->rpc_done = 0;
1569         data->rpc_status = 0;
1570         data->cancelled = 0;
1571         if (isrecover)
1572                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1573         task = rpc_run_task(&task_setup_data);
1574         if (IS_ERR(task))
1575                 return PTR_ERR(task);
1576         status = nfs4_wait_for_completion_rpc_task(task);
1577         if (status != 0) {
1578                 data->cancelled = 1;
1579                 smp_wmb();
1580         } else
1581                 status = data->rpc_status;
1582         rpc_put_task(task);
1583
1584         return status;
1585 }
1586
1587 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1588 {
1589         struct inode *dir = data->dir->d_inode;
1590         struct nfs_openres *o_res = &data->o_res;
1591         int status;
1592
1593         status = nfs4_run_open_task(data, 1);
1594         if (status != 0 || !data->rpc_done)
1595                 return status;
1596
1597         nfs_refresh_inode(dir, o_res->dir_attr);
1598
1599         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1600                 status = _nfs4_proc_open_confirm(data);
1601                 if (status != 0)
1602                         return status;
1603         }
1604
1605         return status;
1606 }
1607
1608 /*
1609  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1610  */
1611 static int _nfs4_proc_open(struct nfs4_opendata *data)
1612 {
1613         struct inode *dir = data->dir->d_inode;
1614         struct nfs_server *server = NFS_SERVER(dir);
1615         struct nfs_openargs *o_arg = &data->o_arg;
1616         struct nfs_openres *o_res = &data->o_res;
1617         int status;
1618
1619         status = nfs4_run_open_task(data, 0);
1620         if (!data->rpc_done)
1621                 return status;
1622         if (status != 0) {
1623                 if (status == -NFS4ERR_BADNAME &&
1624                                 !(o_arg->open_flags & O_CREAT))
1625                         return -ENOENT;
1626                 return status;
1627         }
1628
1629         if (o_arg->open_flags & O_CREAT) {
1630                 update_changeattr(dir, &o_res->cinfo);
1631                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1632         } else
1633                 nfs_refresh_inode(dir, o_res->dir_attr);
1634         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1635                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1636         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1637                 status = _nfs4_proc_open_confirm(data);
1638                 if (status != 0)
1639                         return status;
1640         }
1641         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1642                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1643         return 0;
1644 }
1645
1646 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1647 {
1648         unsigned int loop;
1649         int ret;
1650
1651         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1652                 ret = nfs4_wait_clnt_recover(clp);
1653                 if (ret != 0)
1654                         break;
1655                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1656                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1657                         break;
1658                 nfs4_schedule_state_manager(clp);
1659                 ret = -EIO;
1660         }
1661         return ret;
1662 }
1663
1664 static int nfs4_recover_expired_lease(struct nfs_server *server)
1665 {
1666         return nfs4_client_recover_expired_lease(server->nfs_client);
1667 }
1668
1669 /*
1670  * OPEN_EXPIRED:
1671  *      reclaim state on the server after a network partition.
1672  *      Assumes caller holds the appropriate lock
1673  */
1674 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1675 {
1676         struct nfs4_opendata *opendata;
1677         int ret;
1678
1679         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1680         if (IS_ERR(opendata))
1681                 return PTR_ERR(opendata);
1682         ret = nfs4_open_recover(opendata, state);
1683         if (ret == -ESTALE)
1684                 d_drop(ctx->dentry);
1685         nfs4_opendata_put(opendata);
1686         return ret;
1687 }
1688
1689 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1690 {
1691         struct nfs_server *server = NFS_SERVER(state->inode);
1692         struct nfs4_exception exception = { };
1693         int err;
1694
1695         do {
1696                 err = _nfs4_open_expired(ctx, state);
1697                 switch (err) {
1698                 default:
1699                         goto out;
1700                 case -NFS4ERR_GRACE:
1701                 case -NFS4ERR_DELAY:
1702                         nfs4_handle_exception(server, err, &exception);
1703                         err = 0;
1704                 }
1705         } while (exception.retry);
1706 out:
1707         return err;
1708 }
1709
1710 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1711 {
1712         struct nfs_open_context *ctx;
1713         int ret;
1714
1715         ctx = nfs4_state_find_open_context(state);
1716         if (IS_ERR(ctx))
1717                 return PTR_ERR(ctx);
1718         ret = nfs4_do_open_expired(ctx, state);
1719         put_nfs_open_context(ctx);
1720         return ret;
1721 }
1722
1723 #if defined(CONFIG_NFS_V4_1)
1724 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1725 {
1726         int status;
1727         struct nfs_server *server = NFS_SERVER(state->inode);
1728
1729         status = nfs41_test_stateid(server, state);
1730         if (status == NFS_OK)
1731                 return 0;
1732         nfs41_free_stateid(server, state);
1733         return nfs4_open_expired(sp, state);
1734 }
1735 #endif
1736
1737 /*
1738  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1739  * fields corresponding to attributes that were used to store the verifier.
1740  * Make sure we clobber those fields in the later setattr call
1741  */
1742 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1743 {
1744         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1745             !(sattr->ia_valid & ATTR_ATIME_SET))
1746                 sattr->ia_valid |= ATTR_ATIME;
1747
1748         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1749             !(sattr->ia_valid & ATTR_MTIME_SET))
1750                 sattr->ia_valid |= ATTR_MTIME;
1751 }
1752
1753 /*
1754  * Returns a referenced nfs4_state
1755  */
1756 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)
1757 {
1758         struct nfs4_state_owner  *sp;
1759         struct nfs4_state     *state = NULL;
1760         struct nfs_server       *server = NFS_SERVER(dir);
1761         struct nfs4_opendata *opendata;
1762         int status;
1763
1764         /* Protect against reboot recovery conflicts */
1765         status = -ENOMEM;
1766         if (!(sp = nfs4_get_state_owner(server, cred))) {
1767                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1768                 goto out_err;
1769         }
1770         status = nfs4_recover_expired_lease(server);
1771         if (status != 0)
1772                 goto err_put_state_owner;
1773         if (dentry->d_inode != NULL)
1774                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1775         status = -ENOMEM;
1776         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1777         if (opendata == NULL)
1778                 goto err_put_state_owner;
1779
1780         if (dentry->d_inode != NULL)
1781                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1782
1783         status = _nfs4_proc_open(opendata);
1784         if (status != 0)
1785                 goto err_opendata_put;
1786
1787         state = nfs4_opendata_to_nfs4_state(opendata);
1788         status = PTR_ERR(state);
1789         if (IS_ERR(state))
1790                 goto err_opendata_put;
1791         if (server->caps & NFS_CAP_POSIX_LOCK)
1792                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1793
1794         if (opendata->o_arg.open_flags & O_EXCL) {
1795                 nfs4_exclusive_attrset(opendata, sattr);
1796
1797                 nfs_fattr_init(opendata->o_res.f_attr);
1798                 status = nfs4_do_setattr(state->inode, cred,
1799                                 opendata->o_res.f_attr, sattr,
1800                                 state);
1801                 if (status == 0)
1802                         nfs_setattr_update_inode(state->inode, sattr);
1803                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1804         }
1805         nfs4_opendata_put(opendata);
1806         nfs4_put_state_owner(sp);
1807         *res = state;
1808         return 0;
1809 err_opendata_put:
1810         nfs4_opendata_put(opendata);
1811 err_put_state_owner:
1812         nfs4_put_state_owner(sp);
1813 out_err:
1814         *res = NULL;
1815         return status;
1816 }
1817
1818
1819 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)
1820 {
1821         struct nfs4_exception exception = { };
1822         struct nfs4_state *res;
1823         int status;
1824
1825         do {
1826                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1827                 if (status == 0)
1828                         break;
1829                 /* NOTE: BAD_SEQID means the server and client disagree about the
1830                  * book-keeping w.r.t. state-changing operations
1831                  * (OPEN/CLOSE/LOCK/LOCKU...)
1832                  * It is actually a sign of a bug on the client or on the server.
1833                  *
1834                  * If we receive a BAD_SEQID error in the particular case of
1835                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1836                  * have unhashed the old state_owner for us, and that we can
1837                  * therefore safely retry using a new one. We should still warn
1838                  * the user though...
1839                  */
1840                 if (status == -NFS4ERR_BAD_SEQID) {
1841                         printk(KERN_WARNING "NFS: v4 server %s "
1842                                         " returned a bad sequence-id error!\n",
1843                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1844                         exception.retry = 1;
1845                         continue;
1846                 }
1847                 /*
1848                  * BAD_STATEID on OPEN means that the server cancelled our
1849                  * state before it received the OPEN_CONFIRM.
1850                  * Recover by retrying the request as per the discussion
1851                  * on Page 181 of RFC3530.
1852                  */
1853                 if (status == -NFS4ERR_BAD_STATEID) {
1854                         exception.retry = 1;
1855                         continue;
1856                 }
1857                 if (status == -EAGAIN) {
1858                         /* We must have found a delegation */
1859                         exception.retry = 1;
1860                         continue;
1861                 }
1862                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1863                                         status, &exception));
1864         } while (exception.retry);
1865         return res;
1866 }
1867
1868 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1869                             struct nfs_fattr *fattr, struct iattr *sattr,
1870                             struct nfs4_state *state)
1871 {
1872         struct nfs_server *server = NFS_SERVER(inode);
1873         struct nfs_setattrargs  arg = {
1874                 .fh             = NFS_FH(inode),
1875                 .iap            = sattr,
1876                 .server         = server,
1877                 .bitmask = server->attr_bitmask,
1878         };
1879         struct nfs_setattrres  res = {
1880                 .fattr          = fattr,
1881                 .server         = server,
1882         };
1883         struct rpc_message msg = {
1884                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1885                 .rpc_argp       = &arg,
1886                 .rpc_resp       = &res,
1887                 .rpc_cred       = cred,
1888         };
1889         unsigned long timestamp = jiffies;
1890         int status;
1891
1892         nfs_fattr_init(fattr);
1893
1894         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1895                 /* Use that stateid */
1896         } else if (state != NULL) {
1897                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1898         } else
1899                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1900
1901         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1902         if (status == 0 && state != NULL)
1903                 renew_lease(server, timestamp);
1904         return status;
1905 }
1906
1907 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1908                            struct nfs_fattr *fattr, struct iattr *sattr,
1909                            struct nfs4_state *state)
1910 {
1911         struct nfs_server *server = NFS_SERVER(inode);
1912         struct nfs4_exception exception = {
1913                 .state = state,
1914                 .inode = inode,
1915         };
1916         int err;
1917         do {
1918                 err = nfs4_handle_exception(server,
1919                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1920                                 &exception);
1921         } while (exception.retry);
1922         return err;
1923 }
1924
1925 struct nfs4_closedata {
1926         struct inode *inode;
1927         struct nfs4_state *state;
1928         struct nfs_closeargs arg;
1929         struct nfs_closeres res;
1930         struct nfs_fattr fattr;
1931         unsigned long timestamp;
1932         bool roc;
1933         u32 roc_barrier;
1934 };
1935
1936 static void nfs4_free_closedata(void *data)
1937 {
1938         struct nfs4_closedata *calldata = data;
1939         struct nfs4_state_owner *sp = calldata->state->owner;
1940         struct super_block *sb = calldata->state->inode->i_sb;
1941
1942         if (calldata->roc)
1943                 pnfs_roc_release(calldata->state->inode);
1944         nfs4_put_open_state(calldata->state);
1945         nfs_free_seqid(calldata->arg.seqid);
1946         nfs4_put_state_owner(sp);
1947         nfs_sb_deactive(sb);
1948         kfree(calldata);
1949 }
1950
1951 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1952                 fmode_t fmode)
1953 {
1954         spin_lock(&state->owner->so_lock);
1955         if (!(fmode & FMODE_READ))
1956                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1957         if (!(fmode & FMODE_WRITE))
1958                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1959         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1960         spin_unlock(&state->owner->so_lock);
1961 }
1962
1963 static void nfs4_close_done(struct rpc_task *task, void *data)
1964 {
1965         struct nfs4_closedata *calldata = data;
1966         struct nfs4_state *state = calldata->state;
1967         struct nfs_server *server = NFS_SERVER(calldata->inode);
1968
1969         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1970                 return;
1971         /* hmm. we are done with the inode, and in the process of freeing
1972          * the state_owner. we keep this around to process errors
1973          */
1974         switch (task->tk_status) {
1975                 case 0:
1976                         if (calldata->roc)
1977                                 pnfs_roc_set_barrier(state->inode,
1978                                                      calldata->roc_barrier);
1979                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1980                         renew_lease(server, calldata->timestamp);
1981                         nfs4_close_clear_stateid_flags(state,
1982                                         calldata->arg.fmode);
1983                         break;
1984                 case -NFS4ERR_STALE_STATEID:
1985                 case -NFS4ERR_OLD_STATEID:
1986                 case -NFS4ERR_BAD_STATEID:
1987                 case -NFS4ERR_EXPIRED:
1988                         if (calldata->arg.fmode == 0)
1989                                 break;
1990                 default:
1991                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1992                                 rpc_restart_call_prepare(task);
1993         }
1994         nfs_release_seqid(calldata->arg.seqid);
1995         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1996 }
1997
1998 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1999 {
2000         struct nfs4_closedata *calldata = data;
2001         struct nfs4_state *state = calldata->state;
2002         int call_close = 0;
2003
2004         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2005                 return;
2006
2007         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2008         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2009         spin_lock(&state->owner->so_lock);
2010         /* Calculate the change in open mode */
2011         if (state->n_rdwr == 0) {
2012                 if (state->n_rdonly == 0) {
2013                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2014                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2015                         calldata->arg.fmode &= ~FMODE_READ;
2016                 }
2017                 if (state->n_wronly == 0) {
2018                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2019                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2020                         calldata->arg.fmode &= ~FMODE_WRITE;
2021                 }
2022         }
2023         spin_unlock(&state->owner->so_lock);
2024
2025         if (!call_close) {
2026                 /* Note: exit _without_ calling nfs4_close_done */
2027                 task->tk_action = NULL;
2028                 return;
2029         }
2030
2031         if (calldata->arg.fmode == 0) {
2032                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2033                 if (calldata->roc &&
2034                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2035                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2036                                      task, NULL);
2037                         return;
2038                 }
2039         }
2040
2041         nfs_fattr_init(calldata->res.fattr);
2042         calldata->timestamp = jiffies;
2043         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2044                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2045                                 1, task))
2046                 return;
2047         rpc_call_start(task);
2048 }
2049
2050 static const struct rpc_call_ops nfs4_close_ops = {
2051         .rpc_call_prepare = nfs4_close_prepare,
2052         .rpc_call_done = nfs4_close_done,
2053         .rpc_release = nfs4_free_closedata,
2054 };
2055
2056 /*
2057  * It is possible for data to be read/written from a mem-mapped file
2058  * after the sys_close call (which hits the vfs layer as a flush).
2059  * This means that we can't safely call nfsv4 close on a file until
2060  * the inode is cleared. This in turn means that we are not good
2061  * NFSv4 citizens - we do not indicate to the server to update the file's
2062  * share state even when we are done with one of the three share
2063  * stateid's in the inode.
2064  *
2065  * NOTE: Caller must be holding the sp->so_owner semaphore!
2066  */
2067 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2068 {
2069         struct nfs_server *server = NFS_SERVER(state->inode);
2070         struct nfs4_closedata *calldata;
2071         struct nfs4_state_owner *sp = state->owner;
2072         struct rpc_task *task;
2073         struct rpc_message msg = {
2074                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2075                 .rpc_cred = state->owner->so_cred,
2076         };
2077         struct rpc_task_setup task_setup_data = {
2078                 .rpc_client = server->client,
2079                 .rpc_message = &msg,
2080                 .callback_ops = &nfs4_close_ops,
2081                 .workqueue = nfsiod_workqueue,
2082                 .flags = RPC_TASK_ASYNC,
2083         };
2084         int status = -ENOMEM;
2085
2086         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2087         if (calldata == NULL)
2088                 goto out;
2089         calldata->inode = state->inode;
2090         calldata->state = state;
2091         calldata->arg.fh = NFS_FH(state->inode);
2092         calldata->arg.stateid = &state->open_stateid;
2093         /* Serialization for the sequence id */
2094         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2095         if (calldata->arg.seqid == NULL)
2096                 goto out_free_calldata;
2097         calldata->arg.fmode = 0;
2098         calldata->arg.bitmask = server->cache_consistency_bitmask;
2099         calldata->res.fattr = &calldata->fattr;
2100         calldata->res.seqid = calldata->arg.seqid;
2101         calldata->res.server = server;
2102         calldata->roc = roc;
2103         nfs_sb_active(calldata->inode->i_sb);
2104
2105         msg.rpc_argp = &calldata->arg;
2106         msg.rpc_resp = &calldata->res;
2107         task_setup_data.callback_data = calldata;
2108         task = rpc_run_task(&task_setup_data);
2109         if (IS_ERR(task))
2110                 return PTR_ERR(task);
2111         status = 0;
2112         if (wait)
2113                 status = rpc_wait_for_completion_task(task);
2114         rpc_put_task(task);
2115         return status;
2116 out_free_calldata:
2117         kfree(calldata);
2118 out:
2119         if (roc)
2120                 pnfs_roc_release(state->inode);
2121         nfs4_put_open_state(state);
2122         nfs4_put_state_owner(sp);
2123         return status;
2124 }
2125
2126 static struct inode *
2127 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2128 {
2129         struct nfs4_state *state;
2130
2131         /* Protect against concurrent sillydeletes */
2132         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2133         if (IS_ERR(state))
2134                 return ERR_CAST(state);
2135         ctx->state = state;
2136         return igrab(state->inode);
2137 }
2138
2139 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2140 {
2141         if (ctx->state == NULL)
2142                 return;
2143         if (is_sync)
2144                 nfs4_close_sync(ctx->state, ctx->mode);
2145         else
2146                 nfs4_close_state(ctx->state, ctx->mode);
2147 }
2148
2149 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2150 {
2151         struct nfs4_server_caps_arg args = {
2152                 .fhandle = fhandle,
2153         };
2154         struct nfs4_server_caps_res res = {};
2155         struct rpc_message msg = {
2156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2157                 .rpc_argp = &args,
2158                 .rpc_resp = &res,
2159         };
2160         int status;
2161
2162         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2163         if (status == 0) {
2164                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2165                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2166                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2167                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2168                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2169                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2170                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2171                         server->caps |= NFS_CAP_ACLS;
2172                 if (res.has_links != 0)
2173                         server->caps |= NFS_CAP_HARDLINKS;
2174                 if (res.has_symlinks != 0)
2175                         server->caps |= NFS_CAP_SYMLINKS;
2176                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2177                         server->caps |= NFS_CAP_FILEID;
2178                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2179                         server->caps |= NFS_CAP_MODE;
2180                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2181                         server->caps |= NFS_CAP_NLINK;
2182                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2183                         server->caps |= NFS_CAP_OWNER;
2184                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2185                         server->caps |= NFS_CAP_OWNER_GROUP;
2186                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2187                         server->caps |= NFS_CAP_ATIME;
2188                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2189                         server->caps |= NFS_CAP_CTIME;
2190                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2191                         server->caps |= NFS_CAP_MTIME;
2192
2193                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2194                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2195                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2196                 server->acl_bitmask = res.acl_bitmask;
2197         }
2198
2199         return status;
2200 }
2201
2202 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2203 {
2204         struct nfs4_exception exception = { };
2205         int err;
2206         do {
2207                 err = nfs4_handle_exception(server,
2208                                 _nfs4_server_capabilities(server, fhandle),
2209                                 &exception);
2210         } while (exception.retry);
2211         return err;
2212 }
2213
2214 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2215                 struct nfs_fsinfo *info)
2216 {
2217         struct nfs4_lookup_root_arg args = {
2218                 .bitmask = nfs4_fattr_bitmap,
2219         };
2220         struct nfs4_lookup_res res = {
2221                 .server = server,
2222                 .fattr = info->fattr,
2223                 .fh = fhandle,
2224         };
2225         struct rpc_message msg = {
2226                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2227                 .rpc_argp = &args,
2228                 .rpc_resp = &res,
2229         };
2230
2231         nfs_fattr_init(info->fattr);
2232         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2233 }
2234
2235 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2236                 struct nfs_fsinfo *info)
2237 {
2238         struct nfs4_exception exception = { };
2239         int err;
2240         do {
2241                 err = _nfs4_lookup_root(server, fhandle, info);
2242                 switch (err) {
2243                 case 0:
2244                 case -NFS4ERR_WRONGSEC:
2245                         break;
2246                 default:
2247                         err = nfs4_handle_exception(server, err, &exception);
2248                 }
2249         } while (exception.retry);
2250         return err;
2251 }
2252
2253 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2254                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2255 {
2256         struct rpc_auth *auth;
2257         int ret;
2258
2259         auth = rpcauth_create(flavor, server->client);
2260         if (!auth) {
2261                 ret = -EIO;
2262                 goto out;
2263         }
2264         ret = nfs4_lookup_root(server, fhandle, info);
2265 out:
2266         return ret;
2267 }
2268
2269 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2270                               struct nfs_fsinfo *info)
2271 {
2272         int i, len, status = 0;
2273         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2274
2275         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2276         flav_array[len] = RPC_AUTH_NULL;
2277         len += 1;
2278
2279         for (i = 0; i < len; i++) {
2280                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2281                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2282                         continue;
2283                 break;
2284         }
2285         /*
2286          * -EACCESS could mean that the user doesn't have correct permissions
2287          * to access the mount.  It could also mean that we tried to mount
2288          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2289          * existing mount programs don't handle -EACCES very well so it should
2290          * be mapped to -EPERM instead.
2291          */
2292         if (status == -EACCES)
2293                 status = -EPERM;
2294         return status;
2295 }
2296
2297 /*
2298  * get the file handle for the "/" directory on the server
2299  */
2300 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2301                               struct nfs_fsinfo *info)
2302 {
2303         int minor_version = server->nfs_client->cl_minorversion;
2304         int status = nfs4_lookup_root(server, fhandle, info);
2305         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2306                 /*
2307                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2308                  * by nfs4_map_errors() as this function exits.
2309                  */
2310                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2311         if (status == 0)
2312                 status = nfs4_server_capabilities(server, fhandle);
2313         if (status == 0)
2314                 status = nfs4_do_fsinfo(server, fhandle, info);
2315         return nfs4_map_errors(status);
2316 }
2317
2318 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2319 /*
2320  * Get locations and (maybe) other attributes of a referral.
2321  * Note that we'll actually follow the referral later when
2322  * we detect fsid mismatch in inode revalidation
2323  */
2324 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2325                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2326 {
2327         int status = -ENOMEM;
2328         struct page *page = NULL;
2329         struct nfs4_fs_locations *locations = NULL;
2330
2331         page = alloc_page(GFP_KERNEL);
2332         if (page == NULL)
2333                 goto out;
2334         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2335         if (locations == NULL)
2336                 goto out;
2337
2338         status = nfs4_proc_fs_locations(dir, name, locations, page);
2339         if (status != 0)
2340                 goto out;
2341         /* Make sure server returned a different fsid for the referral */
2342         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2343                 dprintk("%s: server did not return a different fsid for"
2344                         " a referral at %s\n", __func__, name->name);
2345                 status = -EIO;
2346                 goto out;
2347         }
2348         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2349         nfs_fixup_referral_attributes(&locations->fattr);
2350
2351         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2352         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2353         memset(fhandle, 0, sizeof(struct nfs_fh));
2354 out:
2355         if (page)
2356                 __free_page(page);
2357         kfree(locations);
2358         return status;
2359 }
2360
2361 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2362 {
2363         struct nfs4_getattr_arg args = {
2364                 .fh = fhandle,
2365                 .bitmask = server->attr_bitmask,
2366         };
2367         struct nfs4_getattr_res res = {
2368                 .fattr = fattr,
2369                 .server = server,
2370         };
2371         struct rpc_message msg = {
2372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2373                 .rpc_argp = &args,
2374                 .rpc_resp = &res,
2375         };
2376
2377         nfs_fattr_init(fattr);
2378         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2379 }
2380
2381 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2382 {
2383         struct nfs4_exception exception = { };
2384         int err;
2385         do {
2386                 err = nfs4_handle_exception(server,
2387                                 _nfs4_proc_getattr(server, fhandle, fattr),
2388                                 &exception);
2389         } while (exception.retry);
2390         return err;
2391 }
2392
2393 /*
2394  * The file is not closed if it is opened due to the a request to change
2395  * the size of the file. The open call will not be needed once the
2396  * VFS layer lookup-intents are implemented.
2397  *
2398  * Close is called when the inode is destroyed.
2399  * If we haven't opened the file for O_WRONLY, we
2400  * need to in the size_change case to obtain a stateid.
2401  *
2402  * Got race?
2403  * Because OPEN is always done by name in nfsv4, it is
2404  * possible that we opened a different file by the same
2405  * name.  We can recognize this race condition, but we
2406  * can't do anything about it besides returning an error.
2407  *
2408  * This will be fixed with VFS changes (lookup-intent).
2409  */
2410 static int
2411 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2412                   struct iattr *sattr)
2413 {
2414         struct inode *inode = dentry->d_inode;
2415         struct rpc_cred *cred = NULL;
2416         struct nfs4_state *state = NULL;
2417         int status;
2418
2419         if (pnfs_ld_layoutret_on_setattr(inode))
2420                 pnfs_return_layout(inode);
2421
2422         nfs_fattr_init(fattr);
2423
2424         /* Search for an existing open(O_WRITE) file */
2425         if (sattr->ia_valid & ATTR_FILE) {
2426                 struct nfs_open_context *ctx;
2427
2428                 ctx = nfs_file_open_context(sattr->ia_file);
2429                 if (ctx) {
2430                         cred = ctx->cred;
2431                         state = ctx->state;
2432                 }
2433         }
2434
2435         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2436         if (status == 0)
2437                 nfs_setattr_update_inode(inode, sattr);
2438         return status;
2439 }
2440
2441 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2442                 const struct qstr *name, struct nfs_fh *fhandle,
2443                 struct nfs_fattr *fattr)
2444 {
2445         struct nfs_server *server = NFS_SERVER(dir);
2446         int                    status;
2447         struct nfs4_lookup_arg args = {
2448                 .bitmask = server->attr_bitmask,
2449                 .dir_fh = NFS_FH(dir),
2450                 .name = name,
2451         };
2452         struct nfs4_lookup_res res = {
2453                 .server = server,
2454                 .fattr = fattr,
2455                 .fh = fhandle,
2456         };
2457         struct rpc_message msg = {
2458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2459                 .rpc_argp = &args,
2460                 .rpc_resp = &res,
2461         };
2462
2463         nfs_fattr_init(fattr);
2464
2465         dprintk("NFS call  lookup %s\n", name->name);
2466         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2467         dprintk("NFS reply lookup: %d\n", status);
2468         return status;
2469 }
2470
2471 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2472 {
2473         memset(fh, 0, sizeof(struct nfs_fh));
2474         fattr->fsid.major = 1;
2475         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2476                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2477         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2478         fattr->nlink = 2;
2479 }
2480
2481 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2482                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2483 {
2484         struct nfs4_exception exception = { };
2485         int err;
2486         do {
2487                 int status;
2488
2489                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2490                 switch (status) {
2491                 case -NFS4ERR_BADNAME:
2492                         return -ENOENT;
2493                 case -NFS4ERR_MOVED:
2494                         return nfs4_get_referral(dir, name, fattr, fhandle);
2495                 case -NFS4ERR_WRONGSEC:
2496                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2497                 }
2498                 err = nfs4_handle_exception(NFS_SERVER(dir),
2499                                 status, &exception);
2500         } while (exception.retry);
2501         return err;
2502 }
2503
2504 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2505 {
2506         struct nfs_server *server = NFS_SERVER(inode);
2507         struct nfs4_accessargs args = {
2508                 .fh = NFS_FH(inode),
2509                 .bitmask = server->attr_bitmask,
2510         };
2511         struct nfs4_accessres res = {
2512                 .server = server,
2513         };
2514         struct rpc_message msg = {
2515                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2516                 .rpc_argp = &args,
2517                 .rpc_resp = &res,
2518                 .rpc_cred = entry->cred,
2519         };
2520         int mode = entry->mask;
2521         int status;
2522
2523         /*
2524          * Determine which access bits we want to ask for...
2525          */
2526         if (mode & MAY_READ)
2527                 args.access |= NFS4_ACCESS_READ;
2528         if (S_ISDIR(inode->i_mode)) {
2529                 if (mode & MAY_WRITE)
2530                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2531                 if (mode & MAY_EXEC)
2532                         args.access |= NFS4_ACCESS_LOOKUP;
2533         } else {
2534                 if (mode & MAY_WRITE)
2535                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2536                 if (mode & MAY_EXEC)
2537                         args.access |= NFS4_ACCESS_EXECUTE;
2538         }
2539
2540         res.fattr = nfs_alloc_fattr();
2541         if (res.fattr == NULL)
2542                 return -ENOMEM;
2543
2544         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2545         if (!status) {
2546                 entry->mask = 0;
2547                 if (res.access & NFS4_ACCESS_READ)
2548                         entry->mask |= MAY_READ;
2549                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2550                         entry->mask |= MAY_WRITE;
2551                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2552                         entry->mask |= MAY_EXEC;
2553                 nfs_refresh_inode(inode, res.fattr);
2554         }
2555         nfs_free_fattr(res.fattr);
2556         return status;
2557 }
2558
2559 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2560 {
2561         struct nfs4_exception exception = { };
2562         int err;
2563         do {
2564                 err = nfs4_handle_exception(NFS_SERVER(inode),
2565                                 _nfs4_proc_access(inode, entry),
2566                                 &exception);
2567         } while (exception.retry);
2568         return err;
2569 }
2570
2571 /*
2572  * TODO: For the time being, we don't try to get any attributes
2573  * along with any of the zero-copy operations READ, READDIR,
2574  * READLINK, WRITE.
2575  *
2576  * In the case of the first three, we want to put the GETATTR
2577  * after the read-type operation -- this is because it is hard
2578  * to predict the length of a GETATTR response in v4, and thus
2579  * align the READ data correctly.  This means that the GETATTR
2580  * may end up partially falling into the page cache, and we should
2581  * shift it into the 'tail' of the xdr_buf before processing.
2582  * To do this efficiently, we need to know the total length
2583  * of data received, which doesn't seem to be available outside
2584  * of the RPC layer.
2585  *
2586  * In the case of WRITE, we also want to put the GETATTR after
2587  * the operation -- in this case because we want to make sure
2588  * we get the post-operation mtime and size.  This means that
2589  * we can't use xdr_encode_pages() as written: we need a variant
2590  * of it which would leave room in the 'tail' iovec.
2591  *
2592  * Both of these changes to the XDR layer would in fact be quite
2593  * minor, but I decided to leave them for a subsequent patch.
2594  */
2595 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2596                 unsigned int pgbase, unsigned int pglen)
2597 {
2598         struct nfs4_readlink args = {
2599                 .fh       = NFS_FH(inode),
2600                 .pgbase   = pgbase,
2601                 .pglen    = pglen,
2602                 .pages    = &page,
2603         };
2604         struct nfs4_readlink_res res;
2605         struct rpc_message msg = {
2606                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2607                 .rpc_argp = &args,
2608                 .rpc_resp = &res,
2609         };
2610
2611         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2612 }
2613
2614 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2615                 unsigned int pgbase, unsigned int pglen)
2616 {
2617         struct nfs4_exception exception = { };
2618         int err;
2619         do {
2620                 err = nfs4_handle_exception(NFS_SERVER(inode),
2621                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2622                                 &exception);
2623         } while (exception.retry);
2624         return err;
2625 }
2626
2627 /*
2628  * Got race?
2629  * We will need to arrange for the VFS layer to provide an atomic open.
2630  * Until then, this create/open method is prone to inefficiency and race
2631  * conditions due to the lookup, create, and open VFS calls from sys_open()
2632  * placed on the wire.
2633  *
2634  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2635  * The file will be opened again in the subsequent VFS open call
2636  * (nfs4_proc_file_open).
2637  *
2638  * The open for read will just hang around to be used by any process that
2639  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2640  */
2641
2642 static int
2643 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2644                  int flags, struct nfs_open_context *ctx)
2645 {
2646         struct dentry *de = dentry;
2647         struct nfs4_state *state;
2648         struct rpc_cred *cred = NULL;
2649         fmode_t fmode = 0;
2650         int status = 0;
2651
2652         if (ctx != NULL) {
2653                 cred = ctx->cred;
2654                 de = ctx->dentry;
2655                 fmode = ctx->mode;
2656         }
2657         sattr->ia_mode &= ~current_umask();
2658         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2659         d_drop(dentry);
2660         if (IS_ERR(state)) {
2661                 status = PTR_ERR(state);
2662                 goto out;
2663         }
2664         d_add(dentry, igrab(state->inode));
2665         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2666         if (ctx != NULL)
2667                 ctx->state = state;
2668         else
2669                 nfs4_close_sync(state, fmode);
2670 out:
2671         return status;
2672 }
2673
2674 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2675 {
2676         struct nfs_server *server = NFS_SERVER(dir);
2677         struct nfs_removeargs args = {
2678                 .fh = NFS_FH(dir),
2679                 .name.len = name->len,
2680                 .name.name = name->name,
2681                 .bitmask = server->attr_bitmask,
2682         };
2683         struct nfs_removeres res = {
2684                 .server = server,
2685         };
2686         struct rpc_message msg = {
2687                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2688                 .rpc_argp = &args,
2689                 .rpc_resp = &res,
2690         };
2691         int status = -ENOMEM;
2692
2693         res.dir_attr = nfs_alloc_fattr();
2694         if (res.dir_attr == NULL)
2695                 goto out;
2696
2697         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2698         if (status == 0) {
2699                 update_changeattr(dir, &res.cinfo);
2700                 nfs_post_op_update_inode(dir, res.dir_attr);
2701         }
2702         nfs_free_fattr(res.dir_attr);
2703 out:
2704         return status;
2705 }
2706
2707 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2708 {
2709         struct nfs4_exception exception = { };
2710         int err;
2711         do {
2712                 err = nfs4_handle_exception(NFS_SERVER(dir),
2713                                 _nfs4_proc_remove(dir, name),
2714                                 &exception);
2715         } while (exception.retry);
2716         return err;
2717 }
2718
2719 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2720 {
2721         struct nfs_server *server = NFS_SERVER(dir);
2722         struct nfs_removeargs *args = msg->rpc_argp;
2723         struct nfs_removeres *res = msg->rpc_resp;
2724
2725         args->bitmask = server->cache_consistency_bitmask;
2726         res->server = server;
2727         res->seq_res.sr_slot = NULL;
2728         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2729 }
2730
2731 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2732 {
2733         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2734
2735         if (!nfs4_sequence_done(task, &res->seq_res))
2736                 return 0;
2737         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2738                 return 0;
2739         update_changeattr(dir, &res->cinfo);
2740         nfs_post_op_update_inode(dir, res->dir_attr);
2741         return 1;
2742 }
2743
2744 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2745 {
2746         struct nfs_server *server = NFS_SERVER(dir);
2747         struct nfs_renameargs *arg = msg->rpc_argp;
2748         struct nfs_renameres *res = msg->rpc_resp;
2749
2750         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2751         arg->bitmask = server->attr_bitmask;
2752         res->server = server;
2753 }
2754
2755 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2756                                  struct inode *new_dir)
2757 {
2758         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2759
2760         if (!nfs4_sequence_done(task, &res->seq_res))
2761                 return 0;
2762         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2763                 return 0;
2764
2765         update_changeattr(old_dir, &res->old_cinfo);
2766         nfs_post_op_update_inode(old_dir, res->old_fattr);
2767         update_changeattr(new_dir, &res->new_cinfo);
2768         nfs_post_op_update_inode(new_dir, res->new_fattr);
2769         return 1;
2770 }
2771
2772 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2773                 struct inode *new_dir, struct qstr *new_name)
2774 {
2775         struct nfs_server *server = NFS_SERVER(old_dir);
2776         struct nfs_renameargs arg = {
2777                 .old_dir = NFS_FH(old_dir),
2778                 .new_dir = NFS_FH(new_dir),
2779                 .old_name = old_name,
2780                 .new_name = new_name,
2781                 .bitmask = server->attr_bitmask,
2782         };
2783         struct nfs_renameres res = {
2784                 .server = server,
2785         };
2786         struct rpc_message msg = {
2787                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2788                 .rpc_argp = &arg,
2789                 .rpc_resp = &res,
2790         };
2791         int status = -ENOMEM;
2792
2793         res.old_fattr = nfs_alloc_fattr();
2794         res.new_fattr = nfs_alloc_fattr();
2795         if (res.old_fattr == NULL || res.new_fattr == NULL)
2796                 goto out;
2797
2798         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2799         if (!status) {
2800                 update_changeattr(old_dir, &res.old_cinfo);
2801                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2802                 update_changeattr(new_dir, &res.new_cinfo);
2803                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2804         }
2805 out:
2806         nfs_free_fattr(res.new_fattr);
2807         nfs_free_fattr(res.old_fattr);
2808         return status;
2809 }
2810
2811 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2812                 struct inode *new_dir, struct qstr *new_name)
2813 {
2814         struct nfs4_exception exception = { };
2815         int err;
2816         do {
2817                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2818                                 _nfs4_proc_rename(old_dir, old_name,
2819                                         new_dir, new_name),
2820                                 &exception);
2821         } while (exception.retry);
2822         return err;
2823 }
2824
2825 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2826 {
2827         struct nfs_server *server = NFS_SERVER(inode);
2828         struct nfs4_link_arg arg = {
2829                 .fh     = NFS_FH(inode),
2830                 .dir_fh = NFS_FH(dir),
2831                 .name   = name,
2832                 .bitmask = server->attr_bitmask,
2833         };
2834         struct nfs4_link_res res = {
2835                 .server = server,
2836         };
2837         struct rpc_message msg = {
2838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2839                 .rpc_argp = &arg,
2840                 .rpc_resp = &res,
2841         };
2842         int status = -ENOMEM;
2843
2844         res.fattr = nfs_alloc_fattr();
2845         res.dir_attr = nfs_alloc_fattr();
2846         if (res.fattr == NULL || res.dir_attr == NULL)
2847                 goto out;
2848
2849         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2850         if (!status) {
2851                 update_changeattr(dir, &res.cinfo);
2852                 nfs_post_op_update_inode(dir, res.dir_attr);
2853                 nfs_post_op_update_inode(inode, res.fattr);
2854         }
2855 out:
2856         nfs_free_fattr(res.dir_attr);
2857         nfs_free_fattr(res.fattr);
2858         return status;
2859 }
2860
2861 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2862 {
2863         struct nfs4_exception exception = { };
2864         int err;
2865         do {
2866                 err = nfs4_handle_exception(NFS_SERVER(inode),
2867                                 _nfs4_proc_link(inode, dir, name),
2868                                 &exception);
2869         } while (exception.retry);
2870         return err;
2871 }
2872
2873 struct nfs4_createdata {
2874         struct rpc_message msg;
2875         struct nfs4_create_arg arg;
2876         struct nfs4_create_res res;
2877         struct nfs_fh fh;
2878         struct nfs_fattr fattr;
2879         struct nfs_fattr dir_fattr;
2880 };
2881
2882 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2883                 struct qstr *name, struct iattr *sattr, u32 ftype)
2884 {
2885         struct nfs4_createdata *data;
2886
2887         data = kzalloc(sizeof(*data), GFP_KERNEL);
2888         if (data != NULL) {
2889                 struct nfs_server *server = NFS_SERVER(dir);
2890
2891                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2892                 data->msg.rpc_argp = &data->arg;
2893                 data->msg.rpc_resp = &data->res;
2894                 data->arg.dir_fh = NFS_FH(dir);
2895                 data->arg.server = server;
2896                 data->arg.name = name;
2897                 data->arg.attrs = sattr;
2898                 data->arg.ftype = ftype;
2899                 data->arg.bitmask = server->attr_bitmask;
2900                 data->res.server = server;
2901                 data->res.fh = &data->fh;
2902                 data->res.fattr = &data->fattr;
2903                 data->res.dir_fattr = &data->dir_fattr;
2904                 nfs_fattr_init(data->res.fattr);
2905                 nfs_fattr_init(data->res.dir_fattr);
2906         }
2907         return data;
2908 }
2909
2910 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2911 {
2912         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2913                                     &data->arg.seq_args, &data->res.seq_res, 1);
2914         if (status == 0) {
2915                 update_changeattr(dir, &data->res.dir_cinfo);
2916                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2917                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2918         }
2919         return status;
2920 }
2921
2922 static void nfs4_free_createdata(struct nfs4_createdata *data)
2923 {
2924         kfree(data);
2925 }
2926
2927 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2928                 struct page *page, unsigned int len, struct iattr *sattr)
2929 {
2930         struct nfs4_createdata *data;
2931         int status = -ENAMETOOLONG;
2932
2933         if (len > NFS4_MAXPATHLEN)
2934                 goto out;
2935
2936         status = -ENOMEM;
2937         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2938         if (data == NULL)
2939                 goto out;
2940
2941         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2942         data->arg.u.symlink.pages = &page;
2943         data->arg.u.symlink.len = len;
2944
2945         status = nfs4_do_create(dir, dentry, data);
2946
2947         nfs4_free_createdata(data);
2948 out:
2949         return status;
2950 }
2951
2952 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2953                 struct page *page, unsigned int len, struct iattr *sattr)
2954 {
2955         struct nfs4_exception exception = { };
2956         int err;
2957         do {
2958                 err = nfs4_handle_exception(NFS_SERVER(dir),
2959                                 _nfs4_proc_symlink(dir, dentry, page,
2960                                                         len, sattr),
2961                                 &exception);
2962         } while (exception.retry);
2963         return err;
2964 }
2965
2966 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2967                 struct iattr *sattr)
2968 {
2969         struct nfs4_createdata *data;
2970         int status = -ENOMEM;
2971
2972         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2973         if (data == NULL)
2974                 goto out;
2975
2976         status = nfs4_do_create(dir, dentry, data);
2977
2978         nfs4_free_createdata(data);
2979 out:
2980         return status;
2981 }
2982
2983 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2984                 struct iattr *sattr)
2985 {
2986         struct nfs4_exception exception = { };
2987         int err;
2988
2989         sattr->ia_mode &= ~current_umask();
2990         do {
2991                 err = nfs4_handle_exception(NFS_SERVER(dir),
2992                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2993                                 &exception);
2994         } while (exception.retry);
2995         return err;
2996 }
2997
2998 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2999                 u64 cookie, struct page **pages, unsigned int count, int plus)
3000 {
3001         struct inode            *dir = dentry->d_inode;
3002         struct nfs4_readdir_arg args = {
3003                 .fh = NFS_FH(dir),
3004                 .pages = pages,
3005                 .pgbase = 0,
3006                 .count = count,
3007                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3008                 .plus = plus,
3009         };
3010         struct nfs4_readdir_res res;
3011         struct rpc_message msg = {
3012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3013                 .rpc_argp = &args,
3014                 .rpc_resp = &res,
3015                 .rpc_cred = cred,
3016         };
3017         int                     status;
3018
3019         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3020                         dentry->d_parent->d_name.name,
3021                         dentry->d_name.name,
3022                         (unsigned long long)cookie);
3023         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3024         res.pgbase = args.pgbase;
3025         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3026         if (status >= 0) {
3027                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3028                 status += args.pgbase;
3029         }
3030
3031         nfs_invalidate_atime(dir);
3032
3033         dprintk("%s: returns %d\n", __func__, status);
3034         return status;
3035 }
3036
3037 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3038                 u64 cookie, struct page **pages, unsigned int count, int plus)
3039 {
3040         struct nfs4_exception exception = { };
3041         int err;
3042         do {
3043                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3044                                 _nfs4_proc_readdir(dentry, cred, cookie,
3045                                         pages, count, plus),
3046                                 &exception);
3047         } while (exception.retry);
3048         return err;
3049 }
3050
3051 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3052                 struct iattr *sattr, dev_t rdev)
3053 {
3054         struct nfs4_createdata *data;
3055         int mode = sattr->ia_mode;
3056         int status = -ENOMEM;
3057
3058         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3059         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3060
3061         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3062         if (data == NULL)
3063                 goto out;
3064
3065         if (S_ISFIFO(mode))
3066                 data->arg.ftype = NF4FIFO;
3067         else if (S_ISBLK(mode)) {
3068                 data->arg.ftype = NF4BLK;
3069                 data->arg.u.device.specdata1 = MAJOR(rdev);
3070                 data->arg.u.device.specdata2 = MINOR(rdev);
3071         }
3072         else if (S_ISCHR(mode)) {
3073                 data->arg.ftype = NF4CHR;
3074                 data->arg.u.device.specdata1 = MAJOR(rdev);
3075                 data->arg.u.device.specdata2 = MINOR(rdev);
3076         }
3077
3078         status = nfs4_do_create(dir, dentry, data);
3079
3080         nfs4_free_createdata(data);
3081 out:
3082         return status;
3083 }
3084
3085 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3086                 struct iattr *sattr, dev_t rdev)
3087 {
3088         struct nfs4_exception exception = { };
3089         int err;
3090
3091         sattr->ia_mode &= ~current_umask();
3092         do {
3093                 err = nfs4_handle_exception(NFS_SERVER(dir),
3094                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3095                                 &exception);
3096         } while (exception.retry);
3097         return err;
3098 }
3099
3100 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3101                  struct nfs_fsstat *fsstat)
3102 {
3103         struct nfs4_statfs_arg args = {
3104                 .fh = fhandle,
3105                 .bitmask = server->attr_bitmask,
3106         };
3107         struct nfs4_statfs_res res = {
3108                 .fsstat = fsstat,
3109         };
3110         struct rpc_message msg = {
3111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3112                 .rpc_argp = &args,
3113                 .rpc_resp = &res,
3114         };
3115
3116         nfs_fattr_init(fsstat->fattr);
3117         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3118 }
3119
3120 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3121 {
3122         struct nfs4_exception exception = { };
3123         int err;
3124         do {
3125                 err = nfs4_handle_exception(server,
3126                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3127                                 &exception);
3128         } while (exception.retry);
3129         return err;
3130 }
3131
3132 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3133                 struct nfs_fsinfo *fsinfo)
3134 {
3135         struct nfs4_fsinfo_arg args = {
3136                 .fh = fhandle,
3137                 .bitmask = server->attr_bitmask,
3138         };
3139         struct nfs4_fsinfo_res res = {
3140                 .fsinfo = fsinfo,
3141         };
3142         struct rpc_message msg = {
3143                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3144                 .rpc_argp = &args,
3145                 .rpc_resp = &res,
3146         };
3147
3148         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3149 }
3150
3151 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3152 {
3153         struct nfs4_exception exception = { };
3154         int err;
3155
3156         do {
3157                 err = nfs4_handle_exception(server,
3158                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3159                                 &exception);
3160         } while (exception.retry);
3161         return err;
3162 }
3163
3164 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3165 {
3166         nfs_fattr_init(fsinfo->fattr);
3167         return nfs4_do_fsinfo(server, fhandle, fsinfo);
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_pathconf_arg args = {
3174                 .fh = fhandle,
3175                 .bitmask = server->attr_bitmask,
3176         };
3177         struct nfs4_pathconf_res res = {
3178                 .pathconf = pathconf,
3179         };
3180         struct rpc_message msg = {
3181                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3182                 .rpc_argp = &args,
3183                 .rpc_resp = &res,
3184         };
3185
3186         /* None of the pathconf attributes are mandatory to implement */
3187         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3188                 memset(pathconf, 0, sizeof(*pathconf));
3189                 return 0;
3190         }
3191
3192         nfs_fattr_init(pathconf->fattr);
3193         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3194 }
3195
3196 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3197                 struct nfs_pathconf *pathconf)
3198 {
3199         struct nfs4_exception exception = { };
3200         int err;
3201
3202         do {
3203                 err = nfs4_handle_exception(server,
3204                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3205                                 &exception);
3206         } while (exception.retry);
3207         return err;
3208 }
3209
3210 void __nfs4_read_done_cb(struct nfs_read_data *data)
3211 {
3212         nfs_invalidate_atime(data->inode);
3213 }
3214
3215 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3216 {
3217         struct nfs_server *server = NFS_SERVER(data->inode);
3218
3219         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3220                 rpc_restart_call_prepare(task);
3221                 return -EAGAIN;
3222         }
3223
3224         __nfs4_read_done_cb(data);
3225         if (task->tk_status > 0)
3226                 renew_lease(server, data->timestamp);
3227         return 0;
3228 }
3229
3230 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3231 {
3232
3233         dprintk("--> %s\n", __func__);
3234
3235         if (!nfs4_sequence_done(task, &data->res.seq_res))
3236                 return -EAGAIN;
3237
3238         return data->read_done_cb ? data->read_done_cb(task, data) :
3239                                     nfs4_read_done_cb(task, data);
3240 }
3241
3242 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3243 {
3244         data->timestamp   = jiffies;
3245         data->read_done_cb = nfs4_read_done_cb;
3246         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3247 }
3248
3249 /* Reset the the nfs_read_data to send the read to the MDS. */
3250 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3251 {
3252         dprintk("%s Reset task for i/o through\n", __func__);
3253         put_lseg(data->lseg);
3254         data->lseg = NULL;
3255         /* offsets will differ in the dense stripe case */
3256         data->args.offset = data->mds_offset;
3257         data->ds_clp = NULL;
3258         data->args.fh     = NFS_FH(data->inode);
3259         data->read_done_cb = nfs4_read_done_cb;
3260         task->tk_ops = data->mds_ops;
3261         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3262 }
3263 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3264
3265 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3266 {
3267         struct inode *inode = data->inode;
3268
3269         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3270                 rpc_restart_call_prepare(task);
3271                 return -EAGAIN;
3272         }
3273         if (task->tk_status >= 0) {
3274                 renew_lease(NFS_SERVER(inode), data->timestamp);
3275                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3276         }
3277         return 0;
3278 }
3279
3280 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3281 {
3282         if (!nfs4_sequence_done(task, &data->res.seq_res))
3283                 return -EAGAIN;
3284         return data->write_done_cb ? data->write_done_cb(task, data) :
3285                 nfs4_write_done_cb(task, data);
3286 }
3287
3288 /* Reset the the nfs_write_data to send the write to the MDS. */
3289 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3290 {
3291         dprintk("%s Reset task for i/o through\n", __func__);
3292         put_lseg(data->lseg);
3293         data->lseg          = NULL;
3294         data->ds_clp        = NULL;
3295         data->write_done_cb = nfs4_write_done_cb;
3296         data->args.fh       = NFS_FH(data->inode);
3297         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3298         data->args.offset   = data->mds_offset;
3299         data->res.fattr     = &data->fattr;
3300         task->tk_ops        = data->mds_ops;
3301         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3302 }
3303 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3304
3305 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3306 {
3307         struct nfs_server *server = NFS_SERVER(data->inode);
3308
3309         if (data->lseg) {
3310                 data->args.bitmask = NULL;
3311                 data->res.fattr = NULL;
3312         } else
3313                 data->args.bitmask = server->cache_consistency_bitmask;
3314         if (!data->write_done_cb)
3315                 data->write_done_cb = nfs4_write_done_cb;
3316         data->res.server = server;
3317         data->timestamp   = jiffies;
3318
3319         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3320 }
3321
3322 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3323 {
3324         struct inode *inode = data->inode;
3325
3326         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3327                 rpc_restart_call_prepare(task);
3328                 return -EAGAIN;
3329         }
3330         nfs_refresh_inode(inode, data->res.fattr);
3331         return 0;
3332 }
3333
3334 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3335 {
3336         if (!nfs4_sequence_done(task, &data->res.seq_res))
3337                 return -EAGAIN;
3338         return data->write_done_cb(task, data);
3339 }
3340
3341 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3342 {
3343         struct nfs_server *server = NFS_SERVER(data->inode);
3344
3345         if (data->lseg) {
3346                 data->args.bitmask = NULL;
3347                 data->res.fattr = NULL;
3348         } else
3349                 data->args.bitmask = server->cache_consistency_bitmask;
3350         if (!data->write_done_cb)
3351                 data->write_done_cb = nfs4_commit_done_cb;
3352         data->res.server = server;
3353         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3354 }
3355
3356 struct nfs4_renewdata {
3357         struct nfs_client       *client;
3358         unsigned long           timestamp;
3359 };
3360
3361 /*
3362  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3363  * standalone procedure for queueing an asynchronous RENEW.
3364  */
3365 static void nfs4_renew_release(void *calldata)
3366 {
3367         struct nfs4_renewdata *data = calldata;
3368         struct nfs_client *clp = data->client;
3369
3370         if (atomic_read(&clp->cl_count) > 1)
3371                 nfs4_schedule_state_renewal(clp);
3372         nfs_put_client(clp);
3373         kfree(data);
3374 }
3375
3376 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3377 {
3378         struct nfs4_renewdata *data = calldata;
3379         struct nfs_client *clp = data->client;
3380         unsigned long timestamp = data->timestamp;
3381
3382         if (task->tk_status < 0) {
3383                 /* Unless we're shutting down, schedule state recovery! */
3384                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3385                         return;
3386                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3387                         nfs4_schedule_lease_recovery(clp);
3388                         return;
3389                 }
3390                 nfs4_schedule_path_down_recovery(clp);
3391         }
3392         do_renew_lease(clp, timestamp);
3393 }
3394
3395 static const struct rpc_call_ops nfs4_renew_ops = {
3396         .rpc_call_done = nfs4_renew_done,
3397         .rpc_release = nfs4_renew_release,
3398 };
3399
3400 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3401 {
3402         struct rpc_message msg = {
3403                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3404                 .rpc_argp       = clp,
3405                 .rpc_cred       = cred,
3406         };
3407         struct nfs4_renewdata *data;
3408
3409         if (renew_flags == 0)
3410                 return 0;
3411         if (!atomic_inc_not_zero(&clp->cl_count))
3412                 return -EIO;
3413         data = kmalloc(sizeof(*data), GFP_NOFS);
3414         if (data == NULL)
3415                 return -ENOMEM;
3416         data->client = clp;
3417         data->timestamp = jiffies;
3418         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3419                         &nfs4_renew_ops, data);
3420 }
3421
3422 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3423 {
3424         struct rpc_message msg = {
3425                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3426                 .rpc_argp       = clp,
3427                 .rpc_cred       = cred,
3428         };
3429         unsigned long now = jiffies;
3430         int status;
3431
3432         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3433         if (status < 0)
3434                 return status;
3435         do_renew_lease(clp, now);
3436         return 0;
3437 }
3438
3439 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3440 {
3441         return (server->caps & NFS_CAP_ACLS)
3442                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3443                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3444 }
3445
3446 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3447  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3448  * the stack.
3449  */
3450 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3451
3452 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3453                 struct page **pages, unsigned int *pgbase)
3454 {
3455         struct page *newpage, **spages;
3456         int rc = 0;
3457         size_t len;
3458         spages = pages;
3459
3460         do {
3461                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3462                 newpage = alloc_page(GFP_KERNEL);
3463
3464                 if (newpage == NULL)
3465                         goto unwind;
3466                 memcpy(page_address(newpage), buf, len);
3467                 buf += len;
3468                 buflen -= len;
3469                 *pages++ = newpage;
3470                 rc++;
3471         } while (buflen != 0);
3472
3473         return rc;
3474
3475 unwind:
3476         for(; rc > 0; rc--)
3477                 __free_page(spages[rc-1]);
3478         return -ENOMEM;
3479 }
3480
3481 struct nfs4_cached_acl {
3482         int cached;
3483         size_t len;
3484         char data[0];
3485 };
3486
3487 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3488 {
3489         struct nfs_inode *nfsi = NFS_I(inode);
3490
3491         spin_lock(&inode->i_lock);
3492         kfree(nfsi->nfs4_acl);
3493         nfsi->nfs4_acl = acl;
3494         spin_unlock(&inode->i_lock);
3495 }
3496
3497 static void nfs4_zap_acl_attr(struct inode *inode)
3498 {
3499         nfs4_set_cached_acl(inode, NULL);
3500 }
3501
3502 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3503 {
3504         struct nfs_inode *nfsi = NFS_I(inode);
3505         struct nfs4_cached_acl *acl;
3506         int ret = -ENOENT;
3507
3508         spin_lock(&inode->i_lock);
3509         acl = nfsi->nfs4_acl;
3510         if (acl == NULL)
3511                 goto out;
3512         if (buf == NULL) /* user is just asking for length */
3513                 goto out_len;
3514         if (acl->cached == 0)
3515                 goto out;
3516         ret = -ERANGE; /* see getxattr(2) man page */
3517         if (acl->len > buflen)
3518                 goto out;
3519         memcpy(buf, acl->data, acl->len);
3520 out_len:
3521         ret = acl->len;
3522 out:
3523         spin_unlock(&inode->i_lock);
3524         return ret;
3525 }
3526
3527 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3528 {
3529         struct nfs4_cached_acl *acl;
3530
3531         if (buf && acl_len <= PAGE_SIZE) {
3532                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3533                 if (acl == NULL)
3534                         goto out;
3535                 acl->cached = 1;
3536                 memcpy(acl->data, buf, acl_len);
3537         } else {
3538                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3539                 if (acl == NULL)
3540                         goto out;
3541                 acl->cached = 0;
3542         }
3543         acl->len = acl_len;
3544 out:
3545         nfs4_set_cached_acl(inode, acl);
3546 }
3547
3548 /*
3549  * The getxattr API returns the required buffer length when called with a
3550  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3551  * the required buf.  On a NULL buf, we send a page of data to the server
3552  * guessing that the ACL request can be serviced by a page. If so, we cache
3553  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3554  * the cache. If not so, we throw away the page, and cache the required
3555  * length. The next getxattr call will then produce another round trip to
3556  * the server, this time with the input buf of the required size.
3557  */
3558 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3559 {
3560         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3561         struct nfs_getaclargs args = {
3562                 .fh = NFS_FH(inode),
3563                 .acl_pages = pages,
3564                 .acl_len = buflen,
3565         };
3566         struct nfs_getaclres res = {
3567                 .acl_len = buflen,
3568         };
3569         void *resp_buf;
3570         struct rpc_message msg = {
3571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3572                 .rpc_argp = &args,
3573                 .rpc_resp = &res,
3574         };
3575         int ret = -ENOMEM, npages, i, acl_len = 0;
3576
3577         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3578         /* As long as we're doing a round trip to the server anyway,
3579          * let's be prepared for a page of acl data. */
3580         if (npages == 0)
3581                 npages = 1;
3582
3583         for (i = 0; i < npages; i++) {
3584                 pages[i] = alloc_page(GFP_KERNEL);
3585                 if (!pages[i])
3586                         goto out_free;
3587         }
3588         if (npages > 1) {
3589                 /* for decoding across pages */
3590                 res.acl_scratch = alloc_page(GFP_KERNEL);
3591                 if (!res.acl_scratch)
3592                         goto out_free;
3593         }
3594         args.acl_len = npages * PAGE_SIZE;
3595         args.acl_pgbase = 0;
3596         /* Let decode_getfacl know not to fail if the ACL data is larger than
3597          * the page we send as a guess */
3598         if (buf == NULL)
3599                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3600         resp_buf = page_address(pages[0]);
3601
3602         dprintk("%s  buf %p buflen %ld npages %d args.acl_len %ld\n",
3603                 __func__, buf, buflen, npages, args.acl_len);
3604         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3605                              &msg, &args.seq_args, &res.seq_res, 0);
3606         if (ret)
3607                 goto out_free;
3608
3609         acl_len = res.acl_len - res.acl_data_offset;
3610         if (acl_len > args.acl_len)
3611                 nfs4_write_cached_acl(inode, NULL, acl_len);
3612         else
3613                 nfs4_write_cached_acl(inode, resp_buf + res.acl_data_offset,
3614                                       acl_len);
3615         if (buf) {
3616                 ret = -ERANGE;
3617                 if (acl_len > buflen)
3618                         goto out_free;
3619                 _copy_from_pages(buf, pages, res.acl_data_offset,
3620                                 res.acl_len);
3621         }
3622         ret = acl_len;
3623 out_free:
3624         for (i = 0; i < npages; i++)
3625                 if (pages[i])
3626                         __free_page(pages[i]);
3627         if (res.acl_scratch)
3628                 __free_page(res.acl_scratch);
3629         return ret;
3630 }
3631
3632 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3633 {
3634         struct nfs4_exception exception = { };
3635         ssize_t ret;
3636         do {
3637                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3638                 if (ret >= 0)
3639                         break;
3640                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3641         } while (exception.retry);
3642         return ret;
3643 }
3644
3645 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3646 {
3647         struct nfs_server *server = NFS_SERVER(inode);
3648         int ret;
3649
3650         if (!nfs4_server_supports_acls(server))
3651                 return -EOPNOTSUPP;
3652         ret = nfs_revalidate_inode(server, inode);
3653         if (ret < 0)
3654                 return ret;
3655         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3656                 nfs_zap_acl_cache(inode);
3657         ret = nfs4_read_cached_acl(inode, buf, buflen);
3658         if (ret != -ENOENT)
3659                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3660                  * but no cached acl data, just the acl length */
3661                 return ret;
3662         return nfs4_get_acl_uncached(inode, buf, buflen);
3663 }
3664
3665 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3666 {
3667         struct nfs_server *server = NFS_SERVER(inode);
3668         struct page *pages[NFS4ACL_MAXPAGES];
3669         struct nfs_setaclargs arg = {
3670                 .fh             = NFS_FH(inode),
3671                 .acl_pages      = pages,
3672                 .acl_len        = buflen,
3673         };
3674         struct nfs_setaclres res;
3675         struct rpc_message msg = {
3676                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3677                 .rpc_argp       = &arg,
3678                 .rpc_resp       = &res,
3679         };
3680         int ret, i;
3681
3682         if (!nfs4_server_supports_acls(server))
3683                 return -EOPNOTSUPP;
3684         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3685         if (i < 0)
3686                 return i;
3687         nfs_inode_return_delegation(inode);
3688         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3689
3690         /*
3691          * Free each page after tx, so the only ref left is
3692          * held by the network stack
3693          */
3694         for (; i > 0; i--)
3695                 put_page(pages[i-1]);
3696
3697         /*
3698          * Acl update can result in inode attribute update.
3699          * so mark the attribute cache invalid.
3700          */
3701         spin_lock(&inode->i_lock);
3702         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3703         spin_unlock(&inode->i_lock);
3704         nfs_access_zap_cache(inode);
3705         nfs_zap_acl_cache(inode);
3706         return ret;
3707 }
3708
3709 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3710 {
3711         struct nfs4_exception exception = { };
3712         int err;
3713         do {
3714                 err = nfs4_handle_exception(NFS_SERVER(inode),
3715                                 __nfs4_proc_set_acl(inode, buf, buflen),
3716                                 &exception);
3717         } while (exception.retry);
3718         return err;
3719 }
3720
3721 static int
3722 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3723 {
3724         struct nfs_client *clp = server->nfs_client;
3725
3726         if (task->tk_status >= 0)
3727                 return 0;
3728         switch(task->tk_status) {
3729                 case -NFS4ERR_DELEG_REVOKED:
3730                 case -NFS4ERR_ADMIN_REVOKED:
3731                 case -NFS4ERR_BAD_STATEID:
3732                         if (state != NULL)
3733                                 nfs_remove_bad_delegation(state->inode);
3734                 case -NFS4ERR_OPENMODE:
3735                         if (state == NULL)
3736                                 break;
3737                         nfs4_schedule_stateid_recovery(server, state);
3738                         goto wait_on_recovery;
3739                 case -NFS4ERR_EXPIRED:
3740                         if (state != NULL)
3741                                 nfs4_schedule_stateid_recovery(server, state);
3742                 case -NFS4ERR_STALE_STATEID:
3743                 case -NFS4ERR_STALE_CLIENTID:
3744                         nfs4_schedule_lease_recovery(clp);
3745                         goto wait_on_recovery;
3746 #if defined(CONFIG_NFS_V4_1)
3747                 case -NFS4ERR_BADSESSION:
3748                 case -NFS4ERR_BADSLOT:
3749                 case -NFS4ERR_BAD_HIGH_SLOT:
3750                 case -NFS4ERR_DEADSESSION:
3751                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3752                 case -NFS4ERR_SEQ_FALSE_RETRY:
3753                 case -NFS4ERR_SEQ_MISORDERED:
3754                         dprintk("%s ERROR %d, Reset session\n", __func__,
3755                                 task->tk_status);
3756                         nfs4_schedule_session_recovery(clp->cl_session);
3757                         task->tk_status = 0;
3758                         return -EAGAIN;
3759 #endif /* CONFIG_NFS_V4_1 */
3760                 case -NFS4ERR_DELAY:
3761                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3762                 case -NFS4ERR_GRACE:
3763                 case -EKEYEXPIRED:
3764                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3765                         task->tk_status = 0;
3766                         return -EAGAIN;
3767                 case -NFS4ERR_RETRY_UNCACHED_REP:
3768                 case -NFS4ERR_OLD_STATEID:
3769                         task->tk_status = 0;
3770                         return -EAGAIN;
3771         }
3772         task->tk_status = nfs4_map_errors(task->tk_status);
3773         return 0;
3774 wait_on_recovery:
3775         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3776         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3777                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3778         task->tk_status = 0;
3779         return -EAGAIN;
3780 }
3781
3782 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3783                 unsigned short port, struct rpc_cred *cred,
3784                 struct nfs4_setclientid_res *res)
3785 {
3786         nfs4_verifier sc_verifier;
3787         struct nfs4_setclientid setclientid = {
3788                 .sc_verifier = &sc_verifier,
3789                 .sc_prog = program,
3790                 .sc_cb_ident = clp->cl_cb_ident,
3791         };
3792         struct rpc_message msg = {
3793                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3794                 .rpc_argp = &setclientid,
3795                 .rpc_resp = res,
3796                 .rpc_cred = cred,
3797         };
3798         __be32 *p;
3799         int loop = 0;
3800         int status;
3801
3802         p = (__be32*)sc_verifier.data;
3803         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3804         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3805
3806         for(;;) {
3807                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3808                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3809                                 clp->cl_ipaddr,
3810                                 rpc_peeraddr2str(clp->cl_rpcclient,
3811                                                         RPC_DISPLAY_ADDR),
3812                                 rpc_peeraddr2str(clp->cl_rpcclient,
3813                                                         RPC_DISPLAY_PROTO),
3814                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3815                                 clp->cl_id_uniquifier);
3816                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3817                                 sizeof(setclientid.sc_netid),
3818                                 rpc_peeraddr2str(clp->cl_rpcclient,
3819                                                         RPC_DISPLAY_NETID));
3820                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3821                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3822                                 clp->cl_ipaddr, port >> 8, port & 255);
3823
3824                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3825                 if (status != -NFS4ERR_CLID_INUSE)
3826                         break;
3827                 if (loop != 0) {
3828                         ++clp->cl_id_uniquifier;
3829                         break;
3830                 }
3831                 ++loop;
3832                 ssleep(clp->cl_lease_time / HZ + 1);
3833         }
3834         return status;
3835 }
3836
3837 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3838                 struct nfs4_setclientid_res *arg,
3839                 struct rpc_cred *cred)
3840 {
3841         struct nfs_fsinfo fsinfo;
3842         struct rpc_message msg = {
3843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3844                 .rpc_argp = arg,
3845                 .rpc_resp = &fsinfo,
3846                 .rpc_cred = cred,
3847         };
3848         unsigned long now;
3849         int status;
3850
3851         now = jiffies;
3852         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3853         if (status == 0) {
3854                 spin_lock(&clp->cl_lock);
3855                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3856                 clp->cl_last_renewal = now;
3857                 spin_unlock(&clp->cl_lock);
3858         }
3859         return status;
3860 }
3861
3862 struct nfs4_delegreturndata {
3863         struct nfs4_delegreturnargs args;
3864         struct nfs4_delegreturnres res;
3865         struct nfs_fh fh;
3866         nfs4_stateid stateid;
3867         unsigned long timestamp;
3868         struct nfs_fattr fattr;
3869         int rpc_status;
3870 };
3871
3872 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3873 {
3874         struct nfs4_delegreturndata *data = calldata;
3875
3876         if (!nfs4_sequence_done(task, &data->res.seq_res))
3877                 return;
3878
3879         switch (task->tk_status) {
3880         case -NFS4ERR_STALE_STATEID:
3881         case -NFS4ERR_EXPIRED:
3882         case 0:
3883                 renew_lease(data->res.server, data->timestamp);
3884                 break;
3885         default:
3886                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3887                                 -EAGAIN) {
3888                         rpc_restart_call_prepare(task);
3889                         return;
3890                 }
3891         }
3892         data->rpc_status = task->tk_status;
3893 }
3894
3895 static void nfs4_delegreturn_release(void *calldata)
3896 {
3897         kfree(calldata);
3898 }
3899
3900 #if defined(CONFIG_NFS_V4_1)
3901 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3902 {
3903         struct nfs4_delegreturndata *d_data;
3904
3905         d_data = (struct nfs4_delegreturndata *)data;
3906
3907         if (nfs4_setup_sequence(d_data->res.server,
3908                                 &d_data->args.seq_args,
3909                                 &d_data->res.seq_res, 1, task))
3910                 return;
3911         rpc_call_start(task);
3912 }
3913 #endif /* CONFIG_NFS_V4_1 */
3914
3915 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3916 #if defined(CONFIG_NFS_V4_1)
3917         .rpc_call_prepare = nfs4_delegreturn_prepare,
3918 #endif /* CONFIG_NFS_V4_1 */
3919         .rpc_call_done = nfs4_delegreturn_done,
3920         .rpc_release = nfs4_delegreturn_release,
3921 };
3922
3923 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3924 {
3925         struct nfs4_delegreturndata *data;
3926         struct nfs_server *server = NFS_SERVER(inode);
3927         struct rpc_task *task;
3928         struct rpc_message msg = {
3929                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3930                 .rpc_cred = cred,
3931         };
3932         struct rpc_task_setup task_setup_data = {
3933                 .rpc_client = server->client,
3934                 .rpc_message = &msg,
3935                 .callback_ops = &nfs4_delegreturn_ops,
3936                 .flags = RPC_TASK_ASYNC,
3937         };
3938         int status = 0;
3939
3940         data = kzalloc(sizeof(*data), GFP_NOFS);
3941         if (data == NULL)
3942                 return -ENOMEM;
3943         data->args.fhandle = &data->fh;
3944         data->args.stateid = &data->stateid;
3945         data->args.bitmask = server->attr_bitmask;
3946         nfs_copy_fh(&data->fh, NFS_FH(inode));
3947         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3948         data->res.fattr = &data->fattr;
3949         data->res.server = server;
3950         nfs_fattr_init(data->res.fattr);
3951         data->timestamp = jiffies;
3952         data->rpc_status = 0;
3953
3954         task_setup_data.callback_data = data;
3955         msg.rpc_argp = &data->args;
3956         msg.rpc_resp = &data->res;
3957         task = rpc_run_task(&task_setup_data);
3958         if (IS_ERR(task))
3959                 return PTR_ERR(task);
3960         if (!issync)
3961                 goto out;
3962         status = nfs4_wait_for_completion_rpc_task(task);
3963         if (status != 0)
3964                 goto out;
3965         status = data->rpc_status;
3966         if (status != 0)
3967                 goto out;
3968         nfs_refresh_inode(inode, &data->fattr);
3969 out:
3970         rpc_put_task(task);
3971         return status;
3972 }
3973
3974 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3975 {
3976         struct nfs_server *server = NFS_SERVER(inode);
3977         struct nfs4_exception exception = { };
3978         int err;
3979         do {
3980                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3981                 switch (err) {
3982                         case -NFS4ERR_STALE_STATEID:
3983                         case -NFS4ERR_EXPIRED:
3984                         case 0:
3985                                 return 0;
3986                 }
3987                 err = nfs4_handle_exception(server, err, &exception);
3988         } while (exception.retry);
3989         return err;
3990 }
3991
3992 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3993 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3994
3995 /*
3996  * sleep, with exponential backoff, and retry the LOCK operation.
3997  */
3998 static unsigned long
3999 nfs4_set_lock_task_retry(unsigned long timeout)
4000 {
4001         schedule_timeout_killable(timeout);
4002         timeout <<= 1;
4003         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4004                 return NFS4_LOCK_MAXTIMEOUT;
4005         return timeout;
4006 }
4007
4008 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4009 {
4010         struct inode *inode = state->inode;
4011         struct nfs_server *server = NFS_SERVER(inode);
4012         struct nfs_client *clp = server->nfs_client;
4013         struct nfs_lockt_args arg = {
4014                 .fh = NFS_FH(inode),
4015                 .fl = request,
4016         };
4017         struct nfs_lockt_res res = {
4018                 .denied = request,
4019         };
4020         struct rpc_message msg = {
4021                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4022                 .rpc_argp       = &arg,
4023                 .rpc_resp       = &res,
4024                 .rpc_cred       = state->owner->so_cred,
4025         };
4026         struct nfs4_lock_state *lsp;
4027         int status;
4028
4029         arg.lock_owner.clientid = clp->cl_clientid;
4030         status = nfs4_set_lock_state(state, request);
4031         if (status != 0)
4032                 goto out;
4033         lsp = request->fl_u.nfs4_fl.owner;
4034         arg.lock_owner.id = lsp->ls_id.id;
4035         arg.lock_owner.s_dev = server->s_dev;
4036         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4037         switch (status) {
4038                 case 0:
4039                         request->fl_type = F_UNLCK;
4040                         break;
4041                 case -NFS4ERR_DENIED:
4042                         status = 0;
4043         }
4044         request->fl_ops->fl_release_private(request);
4045 out:
4046         return status;
4047 }
4048
4049 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4050 {
4051         struct nfs4_exception exception = { };
4052         int err;
4053
4054         do {
4055                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4056                                 _nfs4_proc_getlk(state, cmd, request),
4057                                 &exception);
4058         } while (exception.retry);
4059         return err;
4060 }
4061
4062 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4063 {
4064         int res = 0;
4065         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4066                 case FL_POSIX:
4067                         res = posix_lock_file_wait(file, fl);
4068                         break;
4069                 case FL_FLOCK:
4070                         res = flock_lock_file_wait(file, fl);
4071                         break;
4072                 default:
4073                         BUG();
4074         }
4075         return res;
4076 }
4077
4078 struct nfs4_unlockdata {
4079         struct nfs_locku_args arg;
4080         struct nfs_locku_res res;
4081         struct nfs4_lock_state *lsp;
4082         struct nfs_open_context *ctx;
4083         struct file_lock fl;
4084         const struct nfs_server *server;
4085         unsigned long timestamp;
4086 };
4087
4088 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4089                 struct nfs_open_context *ctx,
4090                 struct nfs4_lock_state *lsp,
4091                 struct nfs_seqid *seqid)
4092 {
4093         struct nfs4_unlockdata *p;
4094         struct inode *inode = lsp->ls_state->inode;
4095
4096         p = kzalloc(sizeof(*p), GFP_NOFS);
4097         if (p == NULL)
4098                 return NULL;
4099         p->arg.fh = NFS_FH(inode);
4100         p->arg.fl = &p->fl;
4101         p->arg.seqid = seqid;
4102         p->res.seqid = seqid;
4103         p->arg.stateid = &lsp->ls_stateid;
4104         p->lsp = lsp;
4105         atomic_inc(&lsp->ls_count);
4106         /* Ensure we don't close file until we're done freeing locks! */
4107         p->ctx = get_nfs_open_context(ctx);
4108         memcpy(&p->fl, fl, sizeof(p->fl));
4109         p->server = NFS_SERVER(inode);
4110         return p;
4111 }
4112
4113 static void nfs4_locku_release_calldata(void *data)
4114 {
4115         struct nfs4_unlockdata *calldata = data;
4116         nfs_free_seqid(calldata->arg.seqid);
4117         nfs4_put_lock_state(calldata->lsp);
4118         put_nfs_open_context(calldata->ctx);
4119         kfree(calldata);
4120 }
4121
4122 static void nfs4_locku_done(struct rpc_task *task, void *data)
4123 {
4124         struct nfs4_unlockdata *calldata = data;
4125
4126         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4127                 return;
4128         switch (task->tk_status) {
4129                 case 0:
4130                         memcpy(calldata->lsp->ls_stateid.data,
4131                                         calldata->res.stateid.data,
4132                                         sizeof(calldata->lsp->ls_stateid.data));
4133                         renew_lease(calldata->server, calldata->timestamp);
4134                         break;
4135                 case -NFS4ERR_BAD_STATEID:
4136                 case -NFS4ERR_OLD_STATEID:
4137                 case -NFS4ERR_STALE_STATEID:
4138                 case -NFS4ERR_EXPIRED:
4139                         break;
4140                 default:
4141                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4142                                 rpc_restart_call_prepare(task);
4143         }
4144 }
4145
4146 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4147 {
4148         struct nfs4_unlockdata *calldata = data;
4149
4150         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4151                 return;
4152         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4153                 /* Note: exit _without_ running nfs4_locku_done */
4154                 task->tk_action = NULL;
4155                 return;
4156         }
4157         calldata->timestamp = jiffies;
4158         if (nfs4_setup_sequence(calldata->server,
4159                                 &calldata->arg.seq_args,
4160                                 &calldata->res.seq_res, 1, task))
4161                 return;
4162         rpc_call_start(task);
4163 }
4164
4165 static const struct rpc_call_ops nfs4_locku_ops = {
4166         .rpc_call_prepare = nfs4_locku_prepare,
4167         .rpc_call_done = nfs4_locku_done,
4168         .rpc_release = nfs4_locku_release_calldata,
4169 };
4170
4171 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4172                 struct nfs_open_context *ctx,
4173                 struct nfs4_lock_state *lsp,
4174                 struct nfs_seqid *seqid)
4175 {
4176         struct nfs4_unlockdata *data;
4177         struct rpc_message msg = {
4178                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4179                 .rpc_cred = ctx->cred,
4180         };
4181         struct rpc_task_setup task_setup_data = {
4182                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4183                 .rpc_message = &msg,
4184                 .callback_ops = &nfs4_locku_ops,
4185                 .workqueue = nfsiod_workqueue,
4186                 .flags = RPC_TASK_ASYNC,
4187         };
4188
4189         /* Ensure this is an unlock - when canceling a lock, the
4190          * canceled lock is passed in, and it won't be an unlock.
4191          */
4192         fl->fl_type = F_UNLCK;
4193
4194         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4195         if (data == NULL) {
4196                 nfs_free_seqid(seqid);
4197                 return ERR_PTR(-ENOMEM);
4198         }
4199
4200         msg.rpc_argp = &data->arg;
4201         msg.rpc_resp = &data->res;
4202         task_setup_data.callback_data = data;
4203         return rpc_run_task(&task_setup_data);
4204 }
4205
4206 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4207 {
4208         struct nfs_inode *nfsi = NFS_I(state->inode);
4209         struct nfs_seqid *seqid;
4210         struct nfs4_lock_state *lsp;
4211         struct rpc_task *task;
4212         int status = 0;
4213         unsigned char fl_flags = request->fl_flags;
4214
4215         status = nfs4_set_lock_state(state, request);
4216         /* Unlock _before_ we do the RPC call */
4217         request->fl_flags |= FL_EXISTS;
4218         down_read(&nfsi->rwsem);
4219         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4220                 up_read(&nfsi->rwsem);
4221                 goto out;
4222         }
4223         up_read(&nfsi->rwsem);
4224         if (status != 0)
4225                 goto out;
4226         /* Is this a delegated lock? */
4227         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4228                 goto out;
4229         lsp = request->fl_u.nfs4_fl.owner;
4230         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4231         status = -ENOMEM;
4232         if (seqid == NULL)
4233                 goto out;
4234         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4235         status = PTR_ERR(task);
4236         if (IS_ERR(task))
4237                 goto out;
4238         status = nfs4_wait_for_completion_rpc_task(task);
4239         rpc_put_task(task);
4240 out:
4241         request->fl_flags = fl_flags;
4242         return status;
4243 }
4244
4245 struct nfs4_lockdata {
4246         struct nfs_lock_args arg;
4247         struct nfs_lock_res res;
4248         struct nfs4_lock_state *lsp;
4249         struct nfs_open_context *ctx;
4250         struct file_lock fl;
4251         unsigned long timestamp;
4252         int rpc_status;
4253         int cancelled;
4254         struct nfs_server *server;
4255 };
4256
4257 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4258                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4259                 gfp_t gfp_mask)
4260 {
4261         struct nfs4_lockdata *p;
4262         struct inode *inode = lsp->ls_state->inode;
4263         struct nfs_server *server = NFS_SERVER(inode);
4264
4265         p = kzalloc(sizeof(*p), gfp_mask);
4266         if (p == NULL)
4267                 return NULL;
4268
4269         p->arg.fh = NFS_FH(inode);
4270         p->arg.fl = &p->fl;
4271         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4272         if (p->arg.open_seqid == NULL)
4273                 goto out_free;
4274         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4275         if (p->arg.lock_seqid == NULL)
4276                 goto out_free_seqid;
4277         p->arg.lock_stateid = &lsp->ls_stateid;
4278         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4279         p->arg.lock_owner.id = lsp->ls_id.id;
4280         p->arg.lock_owner.s_dev = server->s_dev;
4281         p->res.lock_seqid = p->arg.lock_seqid;
4282         p->lsp = lsp;
4283         p->server = server;
4284         atomic_inc(&lsp->ls_count);
4285         p->ctx = get_nfs_open_context(ctx);
4286         memcpy(&p->fl, fl, sizeof(p->fl));
4287         return p;
4288 out_free_seqid:
4289         nfs_free_seqid(p->arg.open_seqid);
4290 out_free:
4291         kfree(p);
4292         return NULL;
4293 }
4294
4295 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4296 {
4297         struct nfs4_lockdata *data = calldata;
4298         struct nfs4_state *state = data->lsp->ls_state;
4299
4300         dprintk("%s: begin!\n", __func__);
4301         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4302                 return;
4303         /* Do we need to do an open_to_lock_owner? */
4304         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4305                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4306                         return;
4307                 data->arg.open_stateid = &state->stateid;
4308                 data->arg.new_lock_owner = 1;
4309                 data->res.open_seqid = data->arg.open_seqid;
4310         } else
4311                 data->arg.new_lock_owner = 0;
4312         data->timestamp = jiffies;
4313         if (nfs4_setup_sequence(data->server,
4314                                 &data->arg.seq_args,
4315                                 &data->res.seq_res, 1, task))
4316                 return;
4317         rpc_call_start(task);
4318         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4319 }
4320
4321 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4322 {
4323         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4324         nfs4_lock_prepare(task, calldata);
4325 }
4326
4327 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4328 {
4329         struct nfs4_lockdata *data = calldata;
4330
4331         dprintk("%s: begin!\n", __func__);
4332
4333         if (!nfs4_sequence_done(task, &data->res.seq_res))
4334                 return;
4335
4336         data->rpc_status = task->tk_status;
4337         if (data->arg.new_lock_owner != 0) {
4338                 if (data->rpc_status == 0)
4339                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4340                 else
4341                         goto out;
4342         }
4343         if (data->rpc_status == 0) {
4344                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4345                                         sizeof(data->lsp->ls_stateid.data));
4346                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4347                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4348         }
4349 out:
4350         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4351 }
4352
4353 static void nfs4_lock_release(void *calldata)
4354 {
4355         struct nfs4_lockdata *data = calldata;
4356
4357         dprintk("%s: begin!\n", __func__);
4358         nfs_free_seqid(data->arg.open_seqid);
4359         if (data->cancelled != 0) {
4360                 struct rpc_task *task;
4361                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4362                                 data->arg.lock_seqid);
4363                 if (!IS_ERR(task))
4364                         rpc_put_task_async(task);
4365                 dprintk("%s: cancelling lock!\n", __func__);
4366         } else
4367                 nfs_free_seqid(data->arg.lock_seqid);
4368         nfs4_put_lock_state(data->lsp);
4369         put_nfs_open_context(data->ctx);
4370         kfree(data);
4371         dprintk("%s: done!\n", __func__);
4372 }
4373
4374 static const struct rpc_call_ops nfs4_lock_ops = {
4375         .rpc_call_prepare = nfs4_lock_prepare,
4376         .rpc_call_done = nfs4_lock_done,
4377         .rpc_release = nfs4_lock_release,
4378 };
4379
4380 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4381         .rpc_call_prepare = nfs4_recover_lock_prepare,
4382         .rpc_call_done = nfs4_lock_done,
4383         .rpc_release = nfs4_lock_release,
4384 };
4385
4386 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4387 {
4388         switch (error) {
4389         case -NFS4ERR_ADMIN_REVOKED:
4390         case -NFS4ERR_BAD_STATEID:
4391                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4392                 if (new_lock_owner != 0 ||
4393                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4394                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4395                 break;
4396         case -NFS4ERR_STALE_STATEID:
4397                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4398         case -NFS4ERR_EXPIRED:
4399                 nfs4_schedule_lease_recovery(server->nfs_client);
4400         };
4401 }
4402
4403 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4404 {
4405         struct nfs4_lockdata *data;
4406         struct rpc_task *task;
4407         struct rpc_message msg = {
4408                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4409                 .rpc_cred = state->owner->so_cred,
4410         };
4411         struct rpc_task_setup task_setup_data = {
4412                 .rpc_client = NFS_CLIENT(state->inode),
4413                 .rpc_message = &msg,
4414                 .callback_ops = &nfs4_lock_ops,
4415                 .workqueue = nfsiod_workqueue,
4416                 .flags = RPC_TASK_ASYNC,
4417         };
4418         int ret;
4419
4420         dprintk("%s: begin!\n", __func__);
4421         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4422                         fl->fl_u.nfs4_fl.owner,
4423                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4424         if (data == NULL)
4425                 return -ENOMEM;
4426         if (IS_SETLKW(cmd))
4427                 data->arg.block = 1;
4428         if (recovery_type > NFS_LOCK_NEW) {
4429                 if (recovery_type == NFS_LOCK_RECLAIM)
4430                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4431                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4432         }
4433         msg.rpc_argp = &data->arg;
4434         msg.rpc_resp = &data->res;
4435         task_setup_data.callback_data = data;
4436         task = rpc_run_task(&task_setup_data);
4437         if (IS_ERR(task))
4438                 return PTR_ERR(task);
4439         ret = nfs4_wait_for_completion_rpc_task(task);
4440         if (ret == 0) {
4441                 ret = data->rpc_status;
4442                 if (ret)
4443                         nfs4_handle_setlk_error(data->server, data->lsp,
4444                                         data->arg.new_lock_owner, ret);
4445         } else
4446                 data->cancelled = 1;
4447         rpc_put_task(task);
4448         dprintk("%s: done, ret = %d!\n", __func__, ret);
4449         return ret;
4450 }
4451
4452 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4453 {
4454         struct nfs_server *server = NFS_SERVER(state->inode);
4455         struct nfs4_exception exception = { };
4456         int err;
4457
4458         do {
4459                 /* Cache the lock if possible... */
4460                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4461                         return 0;
4462                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4463                 if (err != -NFS4ERR_DELAY)
4464                         break;
4465                 nfs4_handle_exception(server, err, &exception);
4466         } while (exception.retry);
4467         return err;
4468 }
4469
4470 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4471 {
4472         struct nfs_server *server = NFS_SERVER(state->inode);
4473         struct nfs4_exception exception = { };
4474         int err;
4475
4476         err = nfs4_set_lock_state(state, request);
4477         if (err != 0)
4478                 return err;
4479         do {
4480                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4481                         return 0;
4482                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4483                 switch (err) {
4484                 default:
4485                         goto out;
4486                 case -NFS4ERR_GRACE:
4487                 case -NFS4ERR_DELAY:
4488                         nfs4_handle_exception(server, err, &exception);
4489                         err = 0;
4490                 }
4491         } while (exception.retry);
4492 out:
4493         return err;
4494 }
4495
4496 #if defined(CONFIG_NFS_V4_1)
4497 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4498 {
4499         int status;
4500         struct nfs_server *server = NFS_SERVER(state->inode);
4501
4502         status = nfs41_test_stateid(server, state);
4503         if (status == NFS_OK)
4504                 return 0;
4505         nfs41_free_stateid(server, state);
4506         return nfs4_lock_expired(state, request);
4507 }
4508 #endif
4509
4510 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4511 {
4512         struct nfs_inode *nfsi = NFS_I(state->inode);
4513         unsigned char fl_flags = request->fl_flags;
4514         int status = -ENOLCK;
4515
4516         if ((fl_flags & FL_POSIX) &&
4517                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4518                 goto out;
4519         /* Is this a delegated open? */
4520         status = nfs4_set_lock_state(state, request);
4521         if (status != 0)
4522                 goto out;
4523         request->fl_flags |= FL_ACCESS;
4524         status = do_vfs_lock(request->fl_file, request);
4525         if (status < 0)
4526                 goto out;
4527         down_read(&nfsi->rwsem);
4528         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4529                 /* Yes: cache locks! */
4530                 /* ...but avoid races with delegation recall... */
4531                 request->fl_flags = fl_flags & ~FL_SLEEP;
4532                 status = do_vfs_lock(request->fl_file, request);
4533                 goto out_unlock;
4534         }
4535         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4536         if (status != 0)
4537                 goto out_unlock;
4538         /* Note: we always want to sleep here! */
4539         request->fl_flags = fl_flags | FL_SLEEP;
4540         if (do_vfs_lock(request->fl_file, request) < 0)
4541                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4542 out_unlock:
4543         up_read(&nfsi->rwsem);
4544 out:
4545         request->fl_flags = fl_flags;
4546         return status;
4547 }
4548
4549 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4550 {
4551         struct nfs4_exception exception = {
4552                 .state = state,
4553         };
4554         int err;
4555
4556         do {
4557                 err = _nfs4_proc_setlk(state, cmd, request);
4558                 if (err == -NFS4ERR_DENIED)
4559                         err = -EAGAIN;
4560                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4561                                 err, &exception);
4562         } while (exception.retry);
4563         return err;
4564 }
4565
4566 static int
4567 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4568 {
4569         struct nfs_open_context *ctx;
4570         struct nfs4_state *state;
4571         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4572         int status;
4573
4574         /* verify open state */
4575         ctx = nfs_file_open_context(filp);
4576         state = ctx->state;
4577
4578         if (request->fl_start < 0 || request->fl_end < 0)
4579                 return -EINVAL;
4580
4581         if (IS_GETLK(cmd)) {
4582                 if (state != NULL)
4583                         return nfs4_proc_getlk(state, F_GETLK, request);
4584                 return 0;
4585         }
4586
4587         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4588                 return -EINVAL;
4589
4590         if (request->fl_type == F_UNLCK) {
4591                 if (state != NULL)
4592                         return nfs4_proc_unlck(state, cmd, request);
4593                 return 0;
4594         }
4595
4596         if (state == NULL)
4597                 return -ENOLCK;
4598         do {
4599                 status = nfs4_proc_setlk(state, cmd, request);
4600                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4601                         break;
4602                 timeout = nfs4_set_lock_task_retry(timeout);
4603                 status = -ERESTARTSYS;
4604                 if (signalled())
4605                         break;
4606         } while(status < 0);
4607         return status;
4608 }
4609
4610 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4611 {
4612         struct nfs_server *server = NFS_SERVER(state->inode);
4613         struct nfs4_exception exception = { };
4614         int err;
4615
4616         err = nfs4_set_lock_state(state, fl);
4617         if (err != 0)
4618                 goto out;
4619         do {
4620                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4621                 switch (err) {
4622                         default:
4623                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4624                                                 __func__, err);
4625                         case 0:
4626                         case -ESTALE:
4627                                 goto out;
4628                         case -NFS4ERR_EXPIRED:
4629                                 nfs4_schedule_stateid_recovery(server, state);
4630                         case -NFS4ERR_STALE_CLIENTID:
4631                         case -NFS4ERR_STALE_STATEID:
4632                                 nfs4_schedule_lease_recovery(server->nfs_client);
4633                                 goto out;
4634                         case -NFS4ERR_BADSESSION:
4635                         case -NFS4ERR_BADSLOT:
4636                         case -NFS4ERR_BAD_HIGH_SLOT:
4637                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4638                         case -NFS4ERR_DEADSESSION:
4639                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4640                                 goto out;
4641                         case -ERESTARTSYS:
4642                                 /*
4643                                  * The show must go on: exit, but mark the
4644                                  * stateid as needing recovery.
4645                                  */
4646                         case -NFS4ERR_DELEG_REVOKED:
4647                         case -NFS4ERR_ADMIN_REVOKED:
4648                         case -NFS4ERR_BAD_STATEID:
4649                         case -NFS4ERR_OPENMODE:
4650                                 nfs4_schedule_stateid_recovery(server, state);
4651                                 err = 0;
4652                                 goto out;
4653                         case -EKEYEXPIRED:
4654                                 /*
4655                                  * User RPCSEC_GSS context has expired.
4656                                  * We cannot recover this stateid now, so
4657                                  * skip it and allow recovery thread to
4658                                  * proceed.
4659                                  */
4660                                 err = 0;
4661                                 goto out;
4662                         case -ENOMEM:
4663                         case -NFS4ERR_DENIED:
4664                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4665                                 err = 0;
4666                                 goto out;
4667                         case -NFS4ERR_DELAY:
4668                                 break;
4669                 }
4670                 err = nfs4_handle_exception(server, err, &exception);
4671         } while (exception.retry);
4672 out:
4673         return err;
4674 }
4675
4676 static void nfs4_release_lockowner_release(void *calldata)
4677 {
4678         kfree(calldata);
4679 }
4680
4681 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4682         .rpc_release = nfs4_release_lockowner_release,
4683 };
4684
4685 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4686 {
4687         struct nfs_server *server = lsp->ls_state->owner->so_server;
4688         struct nfs_release_lockowner_args *args;
4689         struct rpc_message msg = {
4690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4691         };
4692
4693         if (server->nfs_client->cl_mvops->minor_version != 0)
4694                 return;
4695         args = kmalloc(sizeof(*args), GFP_NOFS);
4696         if (!args)
4697                 return;
4698         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4699         args->lock_owner.id = lsp->ls_id.id;
4700         args->lock_owner.s_dev = server->s_dev;
4701         msg.rpc_argp = args;
4702         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4703 }
4704
4705 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4706
4707 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4708                                    const void *buf, size_t buflen,
4709                                    int flags, int type)
4710 {
4711         if (strcmp(key, "") != 0)
4712                 return -EINVAL;
4713
4714         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4715 }
4716
4717 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4718                                    void *buf, size_t buflen, int type)
4719 {
4720         if (strcmp(key, "") != 0)
4721                 return -EINVAL;
4722
4723         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4724 }
4725
4726 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4727                                        size_t list_len, const char *name,
4728                                        size_t name_len, int type)
4729 {
4730         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4731
4732         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4733                 return 0;
4734
4735         if (list && len <= list_len)
4736                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4737         return len;
4738 }
4739
4740 /*
4741  * nfs_fhget will use either the mounted_on_fileid or the fileid
4742  */
4743 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4744 {
4745         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4746                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4747               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4748               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4749                 return;
4750
4751         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4752                 NFS_ATTR_FATTR_NLINK;
4753         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4754         fattr->nlink = 2;
4755 }
4756
4757 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4758                 struct nfs4_fs_locations *fs_locations, struct page *page)
4759 {
4760         struct nfs_server *server = NFS_SERVER(dir);
4761         u32 bitmask[2] = {
4762                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4763         };
4764         struct nfs4_fs_locations_arg args = {
4765                 .dir_fh = NFS_FH(dir),
4766                 .name = name,
4767                 .page = page,
4768                 .bitmask = bitmask,
4769         };
4770         struct nfs4_fs_locations_res res = {
4771                 .fs_locations = fs_locations,
4772         };
4773         struct rpc_message msg = {
4774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4775                 .rpc_argp = &args,
4776                 .rpc_resp = &res,
4777         };
4778         int status;
4779
4780         dprintk("%s: start\n", __func__);
4781
4782         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4783          * is not supported */
4784         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4785                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4786         else
4787                 bitmask[0] |= FATTR4_WORD0_FILEID;
4788
4789         nfs_fattr_init(&fs_locations->fattr);
4790         fs_locations->server = server;
4791         fs_locations->nlocations = 0;
4792         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4793         dprintk("%s: returned status = %d\n", __func__, status);
4794         return status;
4795 }
4796
4797 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4798 {
4799         int status;
4800         struct nfs4_secinfo_arg args = {
4801                 .dir_fh = NFS_FH(dir),
4802                 .name   = name,
4803         };
4804         struct nfs4_secinfo_res res = {
4805                 .flavors     = flavors,
4806         };
4807         struct rpc_message msg = {
4808                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4809                 .rpc_argp = &args,
4810                 .rpc_resp = &res,
4811         };
4812
4813         dprintk("NFS call  secinfo %s\n", name->name);
4814         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4815         dprintk("NFS reply  secinfo: %d\n", status);
4816         return status;
4817 }
4818
4819 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4820 {
4821         struct nfs4_exception exception = { };
4822         int err;
4823         do {
4824                 err = nfs4_handle_exception(NFS_SERVER(dir),
4825                                 _nfs4_proc_secinfo(dir, name, flavors),
4826                                 &exception);
4827         } while (exception.retry);
4828         return err;
4829 }
4830
4831 #ifdef CONFIG_NFS_V4_1
4832 /*
4833  * Check the exchange flags returned by the server for invalid flags, having
4834  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4835  * DS flags set.
4836  */
4837 static int nfs4_check_cl_exchange_flags(u32 flags)
4838 {
4839         if (flags & ~EXCHGID4_FLAG_MASK_R)
4840                 goto out_inval;
4841         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4842             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4843                 goto out_inval;
4844         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4845                 goto out_inval;
4846         return NFS_OK;
4847 out_inval:
4848         return -NFS4ERR_INVAL;
4849 }
4850
4851 static bool
4852 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4853 {
4854         if (a->server_scope_sz == b->server_scope_sz &&
4855             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4856                 return true;
4857
4858         return false;
4859 }
4860
4861 /*
4862  * nfs4_proc_exchange_id()
4863  *
4864  * Since the clientid has expired, all compounds using sessions
4865  * associated with the stale clientid will be returning
4866  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4867  * be in some phase of session reset.
4868  */
4869 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4870 {
4871         nfs4_verifier verifier;
4872         struct nfs41_exchange_id_args args = {
4873                 .client = clp,
4874                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4875         };
4876         struct nfs41_exchange_id_res res = {
4877                 .client = clp,
4878         };
4879         int status;
4880         struct rpc_message msg = {
4881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4882                 .rpc_argp = &args,
4883                 .rpc_resp = &res,
4884                 .rpc_cred = cred,
4885         };
4886         __be32 *p;
4887
4888         dprintk("--> %s\n", __func__);
4889         BUG_ON(clp == NULL);
4890
4891         p = (u32 *)verifier.data;
4892         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4893         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4894         args.verifier = &verifier;
4895
4896         args.id_len = scnprintf(args.id, sizeof(args.id),
4897                                 "%s/%s.%s/%u",
4898                                 clp->cl_ipaddr,
4899                                 init_utsname()->nodename,
4900                                 init_utsname()->domainname,
4901                                 clp->cl_rpcclient->cl_auth->au_flavor);
4902
4903         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4904         if (unlikely(!res.server_scope)) {
4905                 status = -ENOMEM;
4906                 goto out;
4907         }
4908
4909         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4910         if (!status)
4911                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4912
4913         if (!status) {
4914                 if (clp->server_scope &&
4915                     !nfs41_same_server_scope(clp->server_scope,
4916                                              res.server_scope)) {
4917                         dprintk("%s: server_scope mismatch detected\n",
4918                                 __func__);
4919                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4920                         kfree(clp->server_scope);
4921                         clp->server_scope = NULL;
4922                 }
4923
4924                 if (!clp->server_scope) {
4925                         clp->server_scope = res.server_scope;
4926                         goto out;
4927                 }
4928         }
4929         kfree(res.server_scope);
4930 out:
4931         dprintk("<-- %s status= %d\n", __func__, status);
4932         return status;
4933 }
4934
4935 struct nfs4_get_lease_time_data {
4936         struct nfs4_get_lease_time_args *args;
4937         struct nfs4_get_lease_time_res *res;
4938         struct nfs_client *clp;
4939 };
4940
4941 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4942                                         void *calldata)
4943 {
4944         int ret;
4945         struct nfs4_get_lease_time_data *data =
4946                         (struct nfs4_get_lease_time_data *)calldata;
4947
4948         dprintk("--> %s\n", __func__);
4949         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4950         /* just setup sequence, do not trigger session recovery
4951            since we're invoked within one */
4952         ret = nfs41_setup_sequence(data->clp->cl_session,
4953                                    &data->args->la_seq_args,
4954                                    &data->res->lr_seq_res, 0, task);
4955
4956         BUG_ON(ret == -EAGAIN);
4957         rpc_call_start(task);
4958         dprintk("<-- %s\n", __func__);
4959 }
4960
4961 /*
4962  * Called from nfs4_state_manager thread for session setup, so don't recover
4963  * from sequence operation or clientid errors.
4964  */
4965 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4966 {
4967         struct nfs4_get_lease_time_data *data =
4968                         (struct nfs4_get_lease_time_data *)calldata;
4969
4970         dprintk("--> %s\n", __func__);
4971         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4972                 return;
4973         switch (task->tk_status) {
4974         case -NFS4ERR_DELAY:
4975         case -NFS4ERR_GRACE:
4976                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4977                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4978                 task->tk_status = 0;
4979                 /* fall through */
4980         case -NFS4ERR_RETRY_UNCACHED_REP:
4981                 rpc_restart_call_prepare(task);
4982                 return;
4983         }
4984         dprintk("<-- %s\n", __func__);
4985 }
4986
4987 struct rpc_call_ops nfs4_get_lease_time_ops = {
4988         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4989         .rpc_call_done = nfs4_get_lease_time_done,
4990 };
4991
4992 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4993 {
4994         struct rpc_task *task;
4995         struct nfs4_get_lease_time_args args;
4996         struct nfs4_get_lease_time_res res = {
4997                 .lr_fsinfo = fsinfo,
4998         };
4999         struct nfs4_get_lease_time_data data = {
5000                 .args = &args,
5001                 .res = &res,
5002                 .clp = clp,
5003         };
5004         struct rpc_message msg = {
5005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5006                 .rpc_argp = &args,
5007                 .rpc_resp = &res,
5008         };
5009         struct rpc_task_setup task_setup = {
5010                 .rpc_client = clp->cl_rpcclient,
5011                 .rpc_message = &msg,
5012                 .callback_ops = &nfs4_get_lease_time_ops,
5013                 .callback_data = &data,
5014                 .flags = RPC_TASK_TIMEOUT,
5015         };
5016         int status;
5017
5018         dprintk("--> %s\n", __func__);
5019         task = rpc_run_task(&task_setup);
5020
5021         if (IS_ERR(task))
5022                 status = PTR_ERR(task);
5023         else {
5024                 status = task->tk_status;
5025                 rpc_put_task(task);
5026         }
5027         dprintk("<-- %s return %d\n", __func__, status);
5028
5029         return status;
5030 }
5031
5032 /*
5033  * Reset a slot table
5034  */
5035 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5036                                  int ivalue)
5037 {
5038         struct nfs4_slot *new = NULL;
5039         int i;
5040         int ret = 0;
5041
5042         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5043                 max_reqs, tbl->max_slots);
5044
5045         /* Does the newly negotiated max_reqs match the existing slot table? */
5046         if (max_reqs != tbl->max_slots) {
5047                 ret = -ENOMEM;
5048                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5049                               GFP_NOFS);
5050                 if (!new)
5051                         goto out;
5052                 ret = 0;
5053                 kfree(tbl->slots);
5054         }
5055         spin_lock(&tbl->slot_tbl_lock);
5056         if (new) {
5057                 tbl->slots = new;
5058                 tbl->max_slots = max_reqs;
5059         }
5060         for (i = 0; i < tbl->max_slots; ++i)
5061                 tbl->slots[i].seq_nr = ivalue;
5062         spin_unlock(&tbl->slot_tbl_lock);
5063         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5064                 tbl, tbl->slots, tbl->max_slots);
5065 out:
5066         dprintk("<-- %s: return %d\n", __func__, ret);
5067         return ret;
5068 }
5069
5070 /*
5071  * Reset the forechannel and backchannel slot tables
5072  */
5073 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5074 {
5075         int status;
5076
5077         status = nfs4_reset_slot_table(&session->fc_slot_table,
5078                         session->fc_attrs.max_reqs, 1);
5079         if (status)
5080                 return status;
5081
5082         status = nfs4_reset_slot_table(&session->bc_slot_table,
5083                         session->bc_attrs.max_reqs, 0);
5084         return status;
5085 }
5086
5087 /* Destroy the slot table */
5088 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5089 {
5090         if (session->fc_slot_table.slots != NULL) {
5091                 kfree(session->fc_slot_table.slots);
5092                 session->fc_slot_table.slots = NULL;
5093         }
5094         if (session->bc_slot_table.slots != NULL) {
5095                 kfree(session->bc_slot_table.slots);
5096                 session->bc_slot_table.slots = NULL;
5097         }
5098         return;
5099 }
5100
5101 /*
5102  * Initialize slot table
5103  */
5104 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5105                 int max_slots, int ivalue)
5106 {
5107         struct nfs4_slot *slot;
5108         int ret = -ENOMEM;
5109
5110         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5111
5112         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5113
5114         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5115         if (!slot)
5116                 goto out;
5117         ret = 0;
5118
5119         spin_lock(&tbl->slot_tbl_lock);
5120         tbl->max_slots = max_slots;
5121         tbl->slots = slot;
5122         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5123         spin_unlock(&tbl->slot_tbl_lock);
5124         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5125                 tbl, tbl->slots, tbl->max_slots);
5126 out:
5127         dprintk("<-- %s: return %d\n", __func__, ret);
5128         return ret;
5129 }
5130
5131 /*
5132  * Initialize the forechannel and backchannel tables
5133  */
5134 static int nfs4_init_slot_tables(struct nfs4_session *session)
5135 {
5136         struct nfs4_slot_table *tbl;
5137         int status = 0;
5138
5139         tbl = &session->fc_slot_table;
5140         if (tbl->slots == NULL) {
5141                 status = nfs4_init_slot_table(tbl,
5142                                 session->fc_attrs.max_reqs, 1);
5143                 if (status)
5144                         return status;
5145         }
5146
5147         tbl = &session->bc_slot_table;
5148         if (tbl->slots == NULL) {
5149                 status = nfs4_init_slot_table(tbl,
5150                                 session->bc_attrs.max_reqs, 0);
5151                 if (status)
5152                         nfs4_destroy_slot_tables(session);
5153         }
5154
5155         return status;
5156 }
5157
5158 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5159 {
5160         struct nfs4_session *session;
5161         struct nfs4_slot_table *tbl;
5162
5163         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5164         if (!session)
5165                 return NULL;
5166
5167         tbl = &session->fc_slot_table;
5168         tbl->highest_used_slotid = -1;
5169         spin_lock_init(&tbl->slot_tbl_lock);
5170         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5171         init_completion(&tbl->complete);
5172
5173         tbl = &session->bc_slot_table;
5174         tbl->highest_used_slotid = -1;
5175         spin_lock_init(&tbl->slot_tbl_lock);
5176         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5177         init_completion(&tbl->complete);
5178
5179         session->session_state = 1<<NFS4_SESSION_INITING;
5180
5181         session->clp = clp;
5182         return session;
5183 }
5184
5185 void nfs4_destroy_session(struct nfs4_session *session)
5186 {
5187         nfs4_proc_destroy_session(session);
5188         dprintk("%s Destroy backchannel for xprt %p\n",
5189                 __func__, session->clp->cl_rpcclient->cl_xprt);
5190         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5191                                 NFS41_BC_MIN_CALLBACKS);
5192         nfs4_destroy_slot_tables(session);
5193         kfree(session);
5194 }
5195
5196 /*
5197  * Initialize the values to be used by the client in CREATE_SESSION
5198  * If nfs4_init_session set the fore channel request and response sizes,
5199  * use them.
5200  *
5201  * Set the back channel max_resp_sz_cached to zero to force the client to
5202  * always set csa_cachethis to FALSE because the current implementation
5203  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5204  */
5205 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5206 {
5207         struct nfs4_session *session = args->client->cl_session;
5208         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5209                      mxresp_sz = session->fc_attrs.max_resp_sz;
5210
5211         if (mxrqst_sz == 0)
5212                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5213         if (mxresp_sz == 0)
5214                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5215         /* Fore channel attributes */
5216         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5217         args->fc_attrs.max_resp_sz = mxresp_sz;
5218         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5219         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5220
5221         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5222                 "max_ops=%u max_reqs=%u\n",
5223                 __func__,
5224                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5225                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5226
5227         /* Back channel attributes */
5228         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5229         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5230         args->bc_attrs.max_resp_sz_cached = 0;
5231         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5232         args->bc_attrs.max_reqs = 1;
5233
5234         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5235                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5236                 __func__,
5237                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5238                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5239                 args->bc_attrs.max_reqs);
5240 }
5241
5242 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5243 {
5244         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5245         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5246
5247         if (rcvd->max_resp_sz > sent->max_resp_sz)
5248                 return -EINVAL;
5249         /*
5250          * Our requested max_ops is the minimum we need; we're not
5251          * prepared to break up compounds into smaller pieces than that.
5252          * So, no point even trying to continue if the server won't
5253          * cooperate:
5254          */
5255         if (rcvd->max_ops < sent->max_ops)
5256                 return -EINVAL;
5257         if (rcvd->max_reqs == 0)
5258                 return -EINVAL;
5259         return 0;
5260 }
5261
5262 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5263 {
5264         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5265         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5266
5267         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5268                 return -EINVAL;
5269         if (rcvd->max_resp_sz < sent->max_resp_sz)
5270                 return -EINVAL;
5271         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5272                 return -EINVAL;
5273         /* These would render the backchannel useless: */
5274         if (rcvd->max_ops  == 0)
5275                 return -EINVAL;
5276         if (rcvd->max_reqs == 0)
5277                 return -EINVAL;
5278         return 0;
5279 }
5280
5281 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5282                                      struct nfs4_session *session)
5283 {
5284         int ret;
5285
5286         ret = nfs4_verify_fore_channel_attrs(args, session);
5287         if (ret)
5288                 return ret;
5289         return nfs4_verify_back_channel_attrs(args, session);
5290 }
5291
5292 static int _nfs4_proc_create_session(struct nfs_client *clp)
5293 {
5294         struct nfs4_session *session = clp->cl_session;
5295         struct nfs41_create_session_args args = {
5296                 .client = clp,
5297                 .cb_program = NFS4_CALLBACK,
5298         };
5299         struct nfs41_create_session_res res = {
5300                 .client = clp,
5301         };
5302         struct rpc_message msg = {
5303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5304                 .rpc_argp = &args,
5305                 .rpc_resp = &res,
5306         };
5307         int status;
5308
5309         nfs4_init_channel_attrs(&args);
5310         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5311
5312         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5313
5314         if (!status)
5315                 /* Verify the session's negotiated channel_attrs values */
5316                 status = nfs4_verify_channel_attrs(&args, session);
5317         if (!status) {
5318                 /* Increment the clientid slot sequence id */
5319                 clp->cl_seqid++;
5320         }
5321
5322         return status;
5323 }
5324
5325 /*
5326  * Issues a CREATE_SESSION operation to the server.
5327  * It is the responsibility of the caller to verify the session is
5328  * expired before calling this routine.
5329  */
5330 int nfs4_proc_create_session(struct nfs_client *clp)
5331 {
5332         int status;
5333         unsigned *ptr;
5334         struct nfs4_session *session = clp->cl_session;
5335
5336         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5337
5338         status = _nfs4_proc_create_session(clp);
5339         if (status)
5340                 goto out;
5341
5342         /* Init and reset the fore channel */
5343         status = nfs4_init_slot_tables(session);
5344         dprintk("slot table initialization returned %d\n", status);
5345         if (status)
5346                 goto out;
5347         status = nfs4_reset_slot_tables(session);
5348         dprintk("slot table reset returned %d\n", status);
5349         if (status)
5350                 goto out;
5351
5352         ptr = (unsigned *)&session->sess_id.data[0];
5353         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5354                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5355 out:
5356         dprintk("<-- %s\n", __func__);
5357         return status;
5358 }
5359
5360 /*
5361  * Issue the over-the-wire RPC DESTROY_SESSION.
5362  * The caller must serialize access to this routine.
5363  */
5364 int nfs4_proc_destroy_session(struct nfs4_session *session)
5365 {
5366         int status = 0;
5367         struct rpc_message msg;
5368
5369         dprintk("--> nfs4_proc_destroy_session\n");
5370
5371         /* session is still being setup */
5372         if (session->clp->cl_cons_state != NFS_CS_READY)
5373                 return status;
5374
5375         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5376         msg.rpc_argp = session;
5377         msg.rpc_resp = NULL;
5378         msg.rpc_cred = NULL;
5379         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5380
5381         if (status)
5382                 printk(KERN_WARNING
5383                         "Got error %d from the server on DESTROY_SESSION. "
5384                         "Session has been destroyed regardless...\n", status);
5385
5386         dprintk("<-- nfs4_proc_destroy_session\n");
5387         return status;
5388 }
5389
5390 int nfs4_init_session(struct nfs_server *server)
5391 {
5392         struct nfs_client *clp = server->nfs_client;
5393         struct nfs4_session *session;
5394         unsigned int rsize, wsize;
5395         int ret;
5396
5397         if (!nfs4_has_session(clp))
5398                 return 0;
5399
5400         session = clp->cl_session;
5401         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5402                 return 0;
5403
5404         rsize = server->rsize;
5405         if (rsize == 0)
5406                 rsize = NFS_MAX_FILE_IO_SIZE;
5407         wsize = server->wsize;
5408         if (wsize == 0)
5409                 wsize = NFS_MAX_FILE_IO_SIZE;
5410
5411         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5412         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5413
5414         ret = nfs4_recover_expired_lease(server);
5415         if (!ret)
5416                 ret = nfs4_check_client_ready(clp);
5417         return ret;
5418 }
5419
5420 int nfs4_init_ds_session(struct nfs_client *clp)
5421 {
5422         struct nfs4_session *session = clp->cl_session;
5423         int ret;
5424
5425         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5426                 return 0;
5427
5428         ret = nfs4_client_recover_expired_lease(clp);
5429         if (!ret)
5430                 /* Test for the DS role */
5431                 if (!is_ds_client(clp))
5432                         ret = -ENODEV;
5433         if (!ret)
5434                 ret = nfs4_check_client_ready(clp);
5435         return ret;
5436
5437 }
5438 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5439
5440
5441 /*
5442  * Renew the cl_session lease.
5443  */
5444 struct nfs4_sequence_data {
5445         struct nfs_client *clp;
5446         struct nfs4_sequence_args args;
5447         struct nfs4_sequence_res res;
5448 };
5449
5450 static void nfs41_sequence_release(void *data)
5451 {
5452         struct nfs4_sequence_data *calldata = data;
5453         struct nfs_client *clp = calldata->clp;
5454
5455         if (atomic_read(&clp->cl_count) > 1)
5456                 nfs4_schedule_state_renewal(clp);
5457         nfs_put_client(clp);
5458         kfree(calldata);
5459 }
5460
5461 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5462 {
5463         switch(task->tk_status) {
5464         case -NFS4ERR_DELAY:
5465                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5466                 return -EAGAIN;
5467         default:
5468                 nfs4_schedule_lease_recovery(clp);
5469         }
5470         return 0;
5471 }
5472
5473 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5474 {
5475         struct nfs4_sequence_data *calldata = data;
5476         struct nfs_client *clp = calldata->clp;
5477
5478         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5479                 return;
5480
5481         if (task->tk_status < 0) {
5482                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5483                 if (atomic_read(&clp->cl_count) == 1)
5484                         goto out;
5485
5486                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5487                         rpc_restart_call_prepare(task);
5488                         return;
5489                 }
5490         }
5491         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5492 out:
5493         dprintk("<-- %s\n", __func__);
5494 }
5495
5496 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5497 {
5498         struct nfs4_sequence_data *calldata = data;
5499         struct nfs_client *clp = calldata->clp;
5500         struct nfs4_sequence_args *args;
5501         struct nfs4_sequence_res *res;
5502
5503         args = task->tk_msg.rpc_argp;
5504         res = task->tk_msg.rpc_resp;
5505
5506         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5507                 return;
5508         rpc_call_start(task);
5509 }
5510
5511 static const struct rpc_call_ops nfs41_sequence_ops = {
5512         .rpc_call_done = nfs41_sequence_call_done,
5513         .rpc_call_prepare = nfs41_sequence_prepare,
5514         .rpc_release = nfs41_sequence_release,
5515 };
5516
5517 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5518 {
5519         struct nfs4_sequence_data *calldata;
5520         struct rpc_message msg = {
5521                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5522                 .rpc_cred = cred,
5523         };
5524         struct rpc_task_setup task_setup_data = {
5525                 .rpc_client = clp->cl_rpcclient,
5526                 .rpc_message = &msg,
5527                 .callback_ops = &nfs41_sequence_ops,
5528                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5529         };
5530
5531         if (!atomic_inc_not_zero(&clp->cl_count))
5532                 return ERR_PTR(-EIO);
5533         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5534         if (calldata == NULL) {
5535                 nfs_put_client(clp);
5536                 return ERR_PTR(-ENOMEM);
5537         }
5538         msg.rpc_argp = &calldata->args;
5539         msg.rpc_resp = &calldata->res;
5540         calldata->clp = clp;
5541         task_setup_data.callback_data = calldata;
5542
5543         return rpc_run_task(&task_setup_data);
5544 }
5545
5546 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5547 {
5548         struct rpc_task *task;
5549         int ret = 0;
5550
5551         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5552                 return 0;
5553         task = _nfs41_proc_sequence(clp, cred);
5554         if (IS_ERR(task))
5555                 ret = PTR_ERR(task);
5556         else
5557                 rpc_put_task_async(task);
5558         dprintk("<-- %s status=%d\n", __func__, ret);
5559         return ret;
5560 }
5561
5562 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5563 {
5564         struct rpc_task *task;
5565         int ret;
5566
5567         task = _nfs41_proc_sequence(clp, cred);
5568         if (IS_ERR(task)) {
5569                 ret = PTR_ERR(task);
5570                 goto out;
5571         }
5572         ret = rpc_wait_for_completion_task(task);
5573         if (!ret) {
5574                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5575
5576                 if (task->tk_status == 0)
5577                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5578                 ret = task->tk_status;
5579         }
5580         rpc_put_task(task);
5581 out:
5582         dprintk("<-- %s status=%d\n", __func__, ret);
5583         return ret;
5584 }
5585
5586 struct nfs4_reclaim_complete_data {
5587         struct nfs_client *clp;
5588         struct nfs41_reclaim_complete_args arg;
5589         struct nfs41_reclaim_complete_res res;
5590 };
5591
5592 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5593 {
5594         struct nfs4_reclaim_complete_data *calldata = data;
5595
5596         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5597         if (nfs41_setup_sequence(calldata->clp->cl_session,
5598                                 &calldata->arg.seq_args,
5599                                 &calldata->res.seq_res, 0, task))
5600                 return;
5601
5602         rpc_call_start(task);
5603 }
5604
5605 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5606 {
5607         switch(task->tk_status) {
5608         case 0:
5609         case -NFS4ERR_COMPLETE_ALREADY:
5610         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5611                 break;
5612         case -NFS4ERR_DELAY:
5613                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5614                 /* fall through */
5615         case -NFS4ERR_RETRY_UNCACHED_REP:
5616                 return -EAGAIN;
5617         default:
5618                 nfs4_schedule_lease_recovery(clp);
5619         }
5620         return 0;
5621 }
5622
5623 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5624 {
5625         struct nfs4_reclaim_complete_data *calldata = data;
5626         struct nfs_client *clp = calldata->clp;
5627         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5628
5629         dprintk("--> %s\n", __func__);
5630         if (!nfs41_sequence_done(task, res))
5631                 return;
5632
5633         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5634                 rpc_restart_call_prepare(task);
5635                 return;
5636         }
5637         dprintk("<-- %s\n", __func__);
5638 }
5639
5640 static void nfs4_free_reclaim_complete_data(void *data)
5641 {
5642         struct nfs4_reclaim_complete_data *calldata = data;
5643
5644         kfree(calldata);
5645 }
5646
5647 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5648         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5649         .rpc_call_done = nfs4_reclaim_complete_done,
5650         .rpc_release = nfs4_free_reclaim_complete_data,
5651 };
5652
5653 /*
5654  * Issue a global reclaim complete.
5655  */
5656 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5657 {
5658         struct nfs4_reclaim_complete_data *calldata;
5659         struct rpc_task *task;
5660         struct rpc_message msg = {
5661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5662         };
5663         struct rpc_task_setup task_setup_data = {
5664                 .rpc_client = clp->cl_rpcclient,
5665                 .rpc_message = &msg,
5666                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5667                 .flags = RPC_TASK_ASYNC,
5668         };
5669         int status = -ENOMEM;
5670
5671         dprintk("--> %s\n", __func__);
5672         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5673         if (calldata == NULL)
5674                 goto out;
5675         calldata->clp = clp;
5676         calldata->arg.one_fs = 0;
5677
5678         msg.rpc_argp = &calldata->arg;
5679         msg.rpc_resp = &calldata->res;
5680         task_setup_data.callback_data = calldata;
5681         task = rpc_run_task(&task_setup_data);
5682         if (IS_ERR(task)) {
5683                 status = PTR_ERR(task);
5684                 goto out;
5685         }
5686         status = nfs4_wait_for_completion_rpc_task(task);
5687         if (status == 0)
5688                 status = task->tk_status;
5689         rpc_put_task(task);
5690         return 0;
5691 out:
5692         dprintk("<-- %s status=%d\n", __func__, status);
5693         return status;
5694 }
5695
5696 static void
5697 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5698 {
5699         struct nfs4_layoutget *lgp = calldata;
5700         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5701
5702         dprintk("--> %s\n", __func__);
5703         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5704          * right now covering the LAYOUTGET we are about to send.
5705          * However, that is not so catastrophic, and there seems
5706          * to be no way to prevent it completely.
5707          */
5708         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5709                                 &lgp->res.seq_res, 0, task))
5710                 return;
5711         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5712                                           NFS_I(lgp->args.inode)->layout,
5713                                           lgp->args.ctx->state)) {
5714                 rpc_exit(task, NFS4_OK);
5715                 return;
5716         }
5717         rpc_call_start(task);
5718 }
5719
5720 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5721 {
5722         struct nfs4_layoutget *lgp = calldata;
5723         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5724
5725         dprintk("--> %s\n", __func__);
5726
5727         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5728                 return;
5729
5730         switch (task->tk_status) {
5731         case 0:
5732                 break;
5733         case -NFS4ERR_LAYOUTTRYLATER:
5734         case -NFS4ERR_RECALLCONFLICT:
5735                 task->tk_status = -NFS4ERR_DELAY;
5736                 /* Fall through */
5737         default:
5738                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5739                         rpc_restart_call_prepare(task);
5740                         return;
5741                 }
5742         }
5743         dprintk("<-- %s\n", __func__);
5744 }
5745
5746 static void nfs4_layoutget_release(void *calldata)
5747 {
5748         struct nfs4_layoutget *lgp = calldata;
5749
5750         dprintk("--> %s\n", __func__);
5751         put_nfs_open_context(lgp->args.ctx);
5752         kfree(calldata);
5753         dprintk("<-- %s\n", __func__);
5754 }
5755
5756 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5757         .rpc_call_prepare = nfs4_layoutget_prepare,
5758         .rpc_call_done = nfs4_layoutget_done,
5759         .rpc_release = nfs4_layoutget_release,
5760 };
5761
5762 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5763 {
5764         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5765         struct rpc_task *task;
5766         struct rpc_message msg = {
5767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5768                 .rpc_argp = &lgp->args,
5769                 .rpc_resp = &lgp->res,
5770         };
5771         struct rpc_task_setup task_setup_data = {
5772                 .rpc_client = server->client,
5773                 .rpc_message = &msg,
5774                 .callback_ops = &nfs4_layoutget_call_ops,
5775                 .callback_data = lgp,
5776                 .flags = RPC_TASK_ASYNC,
5777         };
5778         int status = 0;
5779
5780         dprintk("--> %s\n", __func__);
5781
5782         lgp->res.layoutp = &lgp->args.layout;
5783         lgp->res.seq_res.sr_slot = NULL;
5784         task = rpc_run_task(&task_setup_data);
5785         if (IS_ERR(task))
5786                 return PTR_ERR(task);
5787         status = nfs4_wait_for_completion_rpc_task(task);
5788         if (status == 0)
5789                 status = task->tk_status;
5790         if (status == 0)
5791                 status = pnfs_layout_process(lgp);
5792         rpc_put_task(task);
5793         dprintk("<-- %s status=%d\n", __func__, status);
5794         return status;
5795 }
5796
5797 static void
5798 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5799 {
5800         struct nfs4_layoutreturn *lrp = calldata;
5801
5802         dprintk("--> %s\n", __func__);
5803         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5804                                 &lrp->res.seq_res, 0, task))
5805                 return;
5806         rpc_call_start(task);
5807 }
5808
5809 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5810 {
5811         struct nfs4_layoutreturn *lrp = calldata;
5812         struct nfs_server *server;
5813         struct pnfs_layout_hdr *lo = lrp->args.layout;
5814
5815         dprintk("--> %s\n", __func__);
5816
5817         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5818                 return;
5819
5820         server = NFS_SERVER(lrp->args.inode);
5821         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5822                 rpc_restart_call_prepare(task);
5823                 return;
5824         }
5825         spin_lock(&lo->plh_inode->i_lock);
5826         if (task->tk_status == 0) {
5827                 if (lrp->res.lrs_present) {
5828                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5829                 } else
5830                         BUG_ON(!list_empty(&lo->plh_segs));
5831         }
5832         lo->plh_block_lgets--;
5833         spin_unlock(&lo->plh_inode->i_lock);
5834         dprintk("<-- %s\n", __func__);
5835 }
5836
5837 static void nfs4_layoutreturn_release(void *calldata)
5838 {
5839         struct nfs4_layoutreturn *lrp = calldata;
5840
5841         dprintk("--> %s\n", __func__);
5842         put_layout_hdr(lrp->args.layout);
5843         kfree(calldata);
5844         dprintk("<-- %s\n", __func__);
5845 }
5846
5847 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5848         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5849         .rpc_call_done = nfs4_layoutreturn_done,
5850         .rpc_release = nfs4_layoutreturn_release,
5851 };
5852
5853 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5854 {
5855         struct rpc_task *task;
5856         struct rpc_message msg = {
5857                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5858                 .rpc_argp = &lrp->args,
5859                 .rpc_resp = &lrp->res,
5860         };
5861         struct rpc_task_setup task_setup_data = {
5862                 .rpc_client = lrp->clp->cl_rpcclient,
5863                 .rpc_message = &msg,
5864                 .callback_ops = &nfs4_layoutreturn_call_ops,
5865                 .callback_data = lrp,
5866         };
5867         int status;
5868
5869         dprintk("--> %s\n", __func__);
5870         task = rpc_run_task(&task_setup_data);
5871         if (IS_ERR(task))
5872                 return PTR_ERR(task);
5873         status = task->tk_status;
5874         dprintk("<-- %s status=%d\n", __func__, status);
5875         rpc_put_task(task);
5876         return status;
5877 }
5878
5879 /*
5880  * Retrieve the list of Data Server devices from the MDS.
5881  */
5882 static int _nfs4_getdevicelist(struct nfs_server *server,
5883                                     const struct nfs_fh *fh,
5884                                     struct pnfs_devicelist *devlist)
5885 {
5886         struct nfs4_getdevicelist_args args = {
5887                 .fh = fh,
5888                 .layoutclass = server->pnfs_curr_ld->id,
5889         };
5890         struct nfs4_getdevicelist_res res = {
5891                 .devlist = devlist,
5892         };
5893         struct rpc_message msg = {
5894                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5895                 .rpc_argp = &args,
5896                 .rpc_resp = &res,
5897         };
5898         int status;
5899
5900         dprintk("--> %s\n", __func__);
5901         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5902                                 &res.seq_res, 0);
5903         dprintk("<-- %s status=%d\n", __func__, status);
5904         return status;
5905 }
5906
5907 int nfs4_proc_getdevicelist(struct nfs_server *server,
5908                             const struct nfs_fh *fh,
5909                             struct pnfs_devicelist *devlist)
5910 {
5911         struct nfs4_exception exception = { };
5912         int err;
5913
5914         do {
5915                 err = nfs4_handle_exception(server,
5916                                 _nfs4_getdevicelist(server, fh, devlist),
5917                                 &exception);
5918         } while (exception.retry);
5919
5920         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5921                 err, devlist->num_devs);
5922
5923         return err;
5924 }
5925 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5926
5927 static int
5928 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5929 {
5930         struct nfs4_getdeviceinfo_args args = {
5931                 .pdev = pdev,
5932         };
5933         struct nfs4_getdeviceinfo_res res = {
5934                 .pdev = pdev,
5935         };
5936         struct rpc_message msg = {
5937                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5938                 .rpc_argp = &args,
5939                 .rpc_resp = &res,
5940         };
5941         int status;
5942
5943         dprintk("--> %s\n", __func__);
5944         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5945         dprintk("<-- %s status=%d\n", __func__, status);
5946
5947         return status;
5948 }
5949
5950 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5951 {
5952         struct nfs4_exception exception = { };
5953         int err;
5954
5955         do {
5956                 err = nfs4_handle_exception(server,
5957                                         _nfs4_proc_getdeviceinfo(server, pdev),
5958                                         &exception);
5959         } while (exception.retry);
5960         return err;
5961 }
5962 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5963
5964 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5965 {
5966         struct nfs4_layoutcommit_data *data = calldata;
5967         struct nfs_server *server = NFS_SERVER(data->args.inode);
5968
5969         if (nfs4_setup_sequence(server, &data->args.seq_args,
5970                                 &data->res.seq_res, 1, task))
5971                 return;
5972         rpc_call_start(task);
5973 }
5974
5975 static void
5976 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5977 {
5978         struct nfs4_layoutcommit_data *data = calldata;
5979         struct nfs_server *server = NFS_SERVER(data->args.inode);
5980
5981         if (!nfs4_sequence_done(task, &data->res.seq_res))
5982                 return;
5983
5984         switch (task->tk_status) { /* Just ignore these failures */
5985         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5986         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5987         case NFS4ERR_BADLAYOUT:     /* no layout */
5988         case NFS4ERR_GRACE:         /* loca_recalim always false */
5989                 task->tk_status = 0;
5990         }
5991
5992         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5993                 rpc_restart_call_prepare(task);
5994                 return;
5995         }
5996
5997         if (task->tk_status == 0)
5998                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5999                                                    data->res.fattr);
6000 }
6001
6002 static void nfs4_layoutcommit_release(void *calldata)
6003 {
6004         struct nfs4_layoutcommit_data *data = calldata;
6005         struct pnfs_layout_segment *lseg, *tmp;
6006         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6007
6008         pnfs_cleanup_layoutcommit(data);
6009         /* Matched by references in pnfs_set_layoutcommit */
6010         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6011                 list_del_init(&lseg->pls_lc_list);
6012                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6013                                        &lseg->pls_flags))
6014                         put_lseg(lseg);
6015         }
6016
6017         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6018         smp_mb__after_clear_bit();
6019         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6020
6021         put_rpccred(data->cred);
6022         kfree(data);
6023 }
6024
6025 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6026         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6027         .rpc_call_done = nfs4_layoutcommit_done,
6028         .rpc_release = nfs4_layoutcommit_release,
6029 };
6030
6031 int
6032 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6033 {
6034         struct rpc_message msg = {
6035                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6036                 .rpc_argp = &data->args,
6037                 .rpc_resp = &data->res,
6038                 .rpc_cred = data->cred,
6039         };
6040         struct rpc_task_setup task_setup_data = {
6041                 .task = &data->task,
6042                 .rpc_client = NFS_CLIENT(data->args.inode),
6043                 .rpc_message = &msg,
6044                 .callback_ops = &nfs4_layoutcommit_ops,
6045                 .callback_data = data,
6046                 .flags = RPC_TASK_ASYNC,
6047         };
6048         struct rpc_task *task;
6049         int status = 0;
6050
6051         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6052                 "lbw: %llu inode %lu\n",
6053                 data->task.tk_pid, sync,
6054                 data->args.lastbytewritten,
6055                 data->args.inode->i_ino);
6056
6057         task = rpc_run_task(&task_setup_data);
6058         if (IS_ERR(task))
6059                 return PTR_ERR(task);
6060         if (sync == false)
6061                 goto out;
6062         status = nfs4_wait_for_completion_rpc_task(task);
6063         if (status != 0)
6064                 goto out;
6065         status = task->tk_status;
6066 out:
6067         dprintk("%s: status %d\n", __func__, status);
6068         rpc_put_task(task);
6069         return status;
6070 }
6071
6072 static int
6073 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6074                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6075 {
6076         struct nfs41_secinfo_no_name_args args = {
6077                 .style = SECINFO_STYLE_CURRENT_FH,
6078         };
6079         struct nfs4_secinfo_res res = {
6080                 .flavors = flavors,
6081         };
6082         struct rpc_message msg = {
6083                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6084                 .rpc_argp = &args,
6085                 .rpc_resp = &res,
6086         };
6087         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6088 }
6089
6090 static int
6091 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6092                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6093 {
6094         struct nfs4_exception exception = { };
6095         int err;
6096         do {
6097                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6098                 switch (err) {
6099                 case 0:
6100                 case -NFS4ERR_WRONGSEC:
6101                 case -NFS4ERR_NOTSUPP:
6102                         break;
6103                 default:
6104                         err = nfs4_handle_exception(server, err, &exception);
6105                 }
6106         } while (exception.retry);
6107         return err;
6108 }
6109
6110 static int
6111 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6112                     struct nfs_fsinfo *info)
6113 {
6114         int err;
6115         struct page *page;
6116         rpc_authflavor_t flavor;
6117         struct nfs4_secinfo_flavors *flavors;
6118
6119         page = alloc_page(GFP_KERNEL);
6120         if (!page) {
6121                 err = -ENOMEM;
6122                 goto out;
6123         }
6124
6125         flavors = page_address(page);
6126         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6127
6128         /*
6129          * Fall back on "guess and check" method if
6130          * the server doesn't support SECINFO_NO_NAME
6131          */
6132         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6133                 err = nfs4_find_root_sec(server, fhandle, info);
6134                 goto out_freepage;
6135         }
6136         if (err)
6137                 goto out_freepage;
6138
6139         flavor = nfs_find_best_sec(flavors);
6140         if (err == 0)
6141                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6142
6143 out_freepage:
6144         put_page(page);
6145         if (err == -EACCES)
6146                 return -EPERM;
6147 out:
6148         return err;
6149 }
6150 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6151 {
6152         int status;
6153         struct nfs41_test_stateid_args args = {
6154                 .stateid = &state->stateid,
6155         };
6156         struct nfs41_test_stateid_res res;
6157         struct rpc_message msg = {
6158                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6159                 .rpc_argp = &args,
6160                 .rpc_resp = &res,
6161         };
6162         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6163         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6164         return status;
6165 }
6166
6167 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6168 {
6169         struct nfs4_exception exception = { };
6170         int err;
6171         do {
6172                 err = nfs4_handle_exception(server,
6173                                 _nfs41_test_stateid(server, state),
6174                                 &exception);
6175         } while (exception.retry);
6176         return err;
6177 }
6178
6179 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6180 {
6181         int status;
6182         struct nfs41_free_stateid_args args = {
6183                 .stateid = &state->stateid,
6184         };
6185         struct nfs41_free_stateid_res res;
6186         struct rpc_message msg = {
6187                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6188                 .rpc_argp = &args,
6189                 .rpc_resp = &res,
6190         };
6191
6192         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6193         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6194         return status;
6195 }
6196
6197 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6198 {
6199         struct nfs4_exception exception = { };
6200         int err;
6201         do {
6202                 err = nfs4_handle_exception(server,
6203                                 _nfs4_free_stateid(server, state),
6204                                 &exception);
6205         } while (exception.retry);
6206         return err;
6207 }
6208 #endif /* CONFIG_NFS_V4_1 */
6209
6210 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6211         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6212         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6213         .recover_open   = nfs4_open_reclaim,
6214         .recover_lock   = nfs4_lock_reclaim,
6215         .establish_clid = nfs4_init_clientid,
6216         .get_clid_cred  = nfs4_get_setclientid_cred,
6217 };
6218
6219 #if defined(CONFIG_NFS_V4_1)
6220 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6221         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6222         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6223         .recover_open   = nfs4_open_reclaim,
6224         .recover_lock   = nfs4_lock_reclaim,
6225         .establish_clid = nfs41_init_clientid,
6226         .get_clid_cred  = nfs4_get_exchange_id_cred,
6227         .reclaim_complete = nfs41_proc_reclaim_complete,
6228 };
6229 #endif /* CONFIG_NFS_V4_1 */
6230
6231 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6232         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6233         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6234         .recover_open   = nfs4_open_expired,
6235         .recover_lock   = nfs4_lock_expired,
6236         .establish_clid = nfs4_init_clientid,
6237         .get_clid_cred  = nfs4_get_setclientid_cred,
6238 };
6239
6240 #if defined(CONFIG_NFS_V4_1)
6241 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6242         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6243         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6244         .recover_open   = nfs41_open_expired,
6245         .recover_lock   = nfs41_lock_expired,
6246         .establish_clid = nfs41_init_clientid,
6247         .get_clid_cred  = nfs4_get_exchange_id_cred,
6248 };
6249 #endif /* CONFIG_NFS_V4_1 */
6250
6251 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6252         .sched_state_renewal = nfs4_proc_async_renew,
6253         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6254         .renew_lease = nfs4_proc_renew,
6255 };
6256
6257 #if defined(CONFIG_NFS_V4_1)
6258 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6259         .sched_state_renewal = nfs41_proc_async_sequence,
6260         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6261         .renew_lease = nfs4_proc_sequence,
6262 };
6263 #endif
6264
6265 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6266         .minor_version = 0,
6267         .call_sync = _nfs4_call_sync,
6268         .validate_stateid = nfs4_validate_delegation_stateid,
6269         .find_root_sec = nfs4_find_root_sec,
6270         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6271         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6272         .state_renewal_ops = &nfs40_state_renewal_ops,
6273 };
6274
6275 #if defined(CONFIG_NFS_V4_1)
6276 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6277         .minor_version = 1,
6278         .call_sync = _nfs4_call_sync_session,
6279         .validate_stateid = nfs41_validate_delegation_stateid,
6280         .find_root_sec = nfs41_find_root_sec,
6281         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6282         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6283         .state_renewal_ops = &nfs41_state_renewal_ops,
6284 };
6285 #endif
6286
6287 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6288         [0] = &nfs_v4_0_minor_ops,
6289 #if defined(CONFIG_NFS_V4_1)
6290         [1] = &nfs_v4_1_minor_ops,
6291 #endif
6292 };
6293
6294 static const struct inode_operations nfs4_file_inode_operations = {
6295         .permission     = nfs_permission,
6296         .getattr        = nfs_getattr,
6297         .setattr        = nfs_setattr,
6298         .getxattr       = generic_getxattr,
6299         .setxattr       = generic_setxattr,
6300         .listxattr      = generic_listxattr,
6301         .removexattr    = generic_removexattr,
6302 };
6303
6304 const struct nfs_rpc_ops nfs_v4_clientops = {
6305         .version        = 4,                    /* protocol version */
6306         .dentry_ops     = &nfs4_dentry_operations,
6307         .dir_inode_ops  = &nfs4_dir_inode_operations,
6308         .file_inode_ops = &nfs4_file_inode_operations,
6309         .file_ops       = &nfs4_file_operations,
6310         .getroot        = nfs4_proc_get_root,
6311         .getattr        = nfs4_proc_getattr,
6312         .setattr        = nfs4_proc_setattr,
6313         .lookup         = nfs4_proc_lookup,
6314         .access         = nfs4_proc_access,
6315         .readlink       = nfs4_proc_readlink,
6316         .create         = nfs4_proc_create,
6317         .remove         = nfs4_proc_remove,
6318         .unlink_setup   = nfs4_proc_unlink_setup,
6319         .unlink_done    = nfs4_proc_unlink_done,
6320         .rename         = nfs4_proc_rename,
6321         .rename_setup   = nfs4_proc_rename_setup,
6322         .rename_done    = nfs4_proc_rename_done,
6323         .link           = nfs4_proc_link,
6324         .symlink        = nfs4_proc_symlink,
6325         .mkdir          = nfs4_proc_mkdir,
6326         .rmdir          = nfs4_proc_remove,
6327         .readdir        = nfs4_proc_readdir,
6328         .mknod          = nfs4_proc_mknod,
6329         .statfs         = nfs4_proc_statfs,
6330         .fsinfo         = nfs4_proc_fsinfo,
6331         .pathconf       = nfs4_proc_pathconf,
6332         .set_capabilities = nfs4_server_capabilities,
6333         .decode_dirent  = nfs4_decode_dirent,
6334         .read_setup     = nfs4_proc_read_setup,
6335         .read_done      = nfs4_read_done,
6336         .write_setup    = nfs4_proc_write_setup,
6337         .write_done     = nfs4_write_done,
6338         .commit_setup   = nfs4_proc_commit_setup,
6339         .commit_done    = nfs4_commit_done,
6340         .lock           = nfs4_proc_lock,
6341         .clear_acl_cache = nfs4_zap_acl_attr,
6342         .close_context  = nfs4_close_context,
6343         .open_context   = nfs4_atomic_open,
6344         .init_client    = nfs4_init_client,
6345         .secinfo        = nfs4_proc_secinfo,
6346 };
6347
6348 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6349         .prefix = XATTR_NAME_NFSV4_ACL,
6350         .list   = nfs4_xattr_list_nfs4_acl,
6351         .get    = nfs4_xattr_get_nfs4_acl,
6352         .set    = nfs4_xattr_set_nfs4_acl,
6353 };
6354
6355 const struct xattr_handler *nfs4_xattr_handlers[] = {
6356         &nfs4_xattr_nfs4_acl_handler,
6357         NULL
6358 };
6359
6360 /*
6361  * Local variables:
6362  *  c-basic-offset: 8
6363  * End:
6364  */