fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83
  84 /* Prevent leaks of NFSv4 errors into userland */
  85 static int nfs4_map_errors(int err)
  86 {
  87         if (err >= -1000)
  88                 return err;
  89         switch (err) {
  90         case -NFS4ERR_RESOURCE:
  91                 return -EREMOTEIO;
  92         case -NFS4ERR_WRONGSEC:
  93                 return -EPERM;
  94         case -NFS4ERR_BADOWNER:
  95         case -NFS4ERR_BADNAME:
  96                 return -EINVAL;
  97         default:
  98                 dprintk("%s could not handle NFSv4 error %d\n",
  99                                 __func__, -err);
 100                 break;
 101         }
 102         return -EIO;
 103 }
 104
 105 /*
 106  * This is our standard bitmap for GETATTR requests.
 107  */
 108 const u32 nfs4_fattr_bitmap[2] = {
 109         FATTR4_WORD0_TYPE
 110         | FATTR4_WORD0_CHANGE
 111         | FATTR4_WORD0_SIZE
 112         | FATTR4_WORD0_FSID
 113         | FATTR4_WORD0_FILEID,
 114         FATTR4_WORD1_MODE
 115         | FATTR4_WORD1_NUMLINKS
 116         | FATTR4_WORD1_OWNER
 117         | FATTR4_WORD1_OWNER_GROUP
 118         | FATTR4_WORD1_RAWDEV
 119         | FATTR4_WORD1_SPACE_USED
 120         | FATTR4_WORD1_TIME_ACCESS
 121         | FATTR4_WORD1_TIME_METADATA
 122         | FATTR4_WORD1_TIME_MODIFY
 123 };
 124
 125 const u32 nfs4_statfs_bitmap[2] = {
 126         FATTR4_WORD0_FILES_AVAIL
 127         | FATTR4_WORD0_FILES_FREE
 128         | FATTR4_WORD0_FILES_TOTAL,
 129         FATTR4_WORD1_SPACE_AVAIL
 130         | FATTR4_WORD1_SPACE_FREE
 131         | FATTR4_WORD1_SPACE_TOTAL
 132 };
 133
 134 const u32 nfs4_pathconf_bitmap[2] = {
 135         FATTR4_WORD0_MAXLINK
 136         | FATTR4_WORD0_MAXNAME,
 137         0
 138 };
 139
 140 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 141                         | FATTR4_WORD0_MAXREAD
 142                         | FATTR4_WORD0_MAXWRITE
 143                         | FATTR4_WORD0_LEASE_TIME,
 144                         FATTR4_WORD1_TIME_DELTA
 145                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 146 };
 147
 148 const u32 nfs4_fs_locations_bitmap[2] = {
 149         FATTR4_WORD0_TYPE
 150         | FATTR4_WORD0_CHANGE
 151         | FATTR4_WORD0_SIZE
 152         | FATTR4_WORD0_FSID
 153         | FATTR4_WORD0_FILEID
 154         | FATTR4_WORD0_FS_LOCATIONS,
 155         FATTR4_WORD1_MODE
 156         | FATTR4_WORD1_NUMLINKS
 157         | FATTR4_WORD1_OWNER
 158         | FATTR4_WORD1_OWNER_GROUP
 159         | FATTR4_WORD1_RAWDEV
 160         | FATTR4_WORD1_SPACE_USED
 161         | FATTR4_WORD1_TIME_ACCESS
 162         | FATTR4_WORD1_TIME_METADATA
 163         | FATTR4_WORD1_TIME_MODIFY
 164         | FATTR4_WORD1_MOUNTED_ON_FILEID
 165 };
 166
 167 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 168                 struct nfs4_readdir_arg *readdir)
 169 {
 170         __be32 *start, *p;
 171
 172         BUG_ON(readdir->count < 80);
 173         if (cookie > 2) {
 174                 readdir->cookie = cookie;
 175                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 176                 return;
 177         }
 178
 179         readdir->cookie = 0;
 180         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 181         if (cookie == 2)
 182                 return;
 183
 184         /*
 185          * NFSv4 servers do not return entries for '.' and '..'
 186          * Therefore, we fake these entries here.  We let '.'
 187          * have cookie 0 and '..' have cookie 1.  Note that
 188          * when talking to the server, we always send cookie 0
 189          * instead of 1 or 2.
 190          */
 191         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 192
 193         if (cookie == 0) {
 194                 *p++ = xdr_one;                                  /* next */
 195                 *p++ = xdr_zero;                   /* cookie, first word */
 196                 *p++ = xdr_one;                   /* cookie, second word */
 197                 *p++ = xdr_one;                             /* entry len */
 198                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 199                 p++;
 200                 *p++ = xdr_one;                         /* bitmap length */
 201                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 202                 *p++ = htonl(8);              /* attribute buffer length */
 203                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 204         }
 205
 206         *p++ = xdr_one;                                  /* next */
 207         *p++ = xdr_zero;                   /* cookie, first word */
 208         *p++ = xdr_two;                   /* cookie, second word */
 209         *p++ = xdr_two;                             /* entry len */
 210         memcpy(p, "..\0\0", 4);                         /* entry */
 211         p++;
 212         *p++ = xdr_one;                         /* bitmap length */
 213         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 214         *p++ = htonl(8);              /* attribute buffer length */
 215         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 216
 217         readdir->pgbase = (char *)p - (char *)start;
 218         readdir->count -= readdir->pgbase;
 219         kunmap_atomic(start, KM_USER0);
 220 }
 221
 222 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 223 {
 224         int res;
 225
 226         might_sleep();
 227
 228         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 229                         nfs_wait_bit_killable, TASK_KILLABLE);
 230         return res;
 231 }
 232
 233 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 234 {
 235         int res = 0;
 236
 237         might_sleep();
 238
 239         if (*timeout <= 0)
 240                 *timeout = NFS4_POLL_RETRY_MIN;
 241         if (*timeout > NFS4_POLL_RETRY_MAX)
 242                 *timeout = NFS4_POLL_RETRY_MAX;
 243         schedule_timeout_killable(*timeout);
 244         if (fatal_signal_pending(current))
 245                 res = -ERESTARTSYS;
 246         *timeout <<= 1;
 247         return res;
 248 }
 249
 250 /* This is the error handling routine for processes that are allowed
 251  * to sleep.
 252  */
 253 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 254 {
 255         struct nfs_client *clp = server->nfs_client;
 256         struct nfs4_state *state = exception->state;
 257         struct inode *inode = exception->inode;
 258         int ret = errorcode;
 259
 260         exception->retry = 0;
 261         switch(errorcode) {
 262                 case 0:
 263                         return 0;
 264                 case -NFS4ERR_OPENMODE:
 265                         if (nfs_have_delegation(inode, FMODE_READ)) {
 266                                 nfs_inode_return_delegation(inode);
 267                                 exception->retry = 1;
 268                                 return 0;
 269                         }
 270                         if (state == NULL)
 271                                 break;
 272                         nfs4_schedule_stateid_recovery(server, state);
 273                         goto wait_on_recovery;
 274                 case -NFS4ERR_DELEG_REVOKED:
 275                 case -NFS4ERR_ADMIN_REVOKED:
 276                 case -NFS4ERR_BAD_STATEID:
 277                         if (state != NULL)
 278                                 nfs_remove_bad_delegation(state->inode);
 279                         if (state == NULL)
 280                                 break;
 281                         nfs4_schedule_stateid_recovery(server, state);
 282                         goto wait_on_recovery;
 283                 case -NFS4ERR_EXPIRED:
 284                         if (state != NULL)
 285                                 nfs4_schedule_stateid_recovery(server, state);
 286                 case -NFS4ERR_STALE_STATEID:
 287                 case -NFS4ERR_STALE_CLIENTID:
 288                         nfs4_schedule_lease_recovery(clp);
 289                         goto wait_on_recovery;
 290 #if defined(CONFIG_NFS_V4_1)
 291                 case -NFS4ERR_BADSESSION:
 292                 case -NFS4ERR_BADSLOT:
 293                 case -NFS4ERR_BAD_HIGH_SLOT:
 294                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 295                 case -NFS4ERR_DEADSESSION:
 296                 case -NFS4ERR_SEQ_FALSE_RETRY:
 297                 case -NFS4ERR_SEQ_MISORDERED:
 298                         dprintk("%s ERROR: %d Reset session\n", __func__,
 299                                 errorcode);
 300                         nfs4_schedule_session_recovery(clp->cl_session);
 301                         exception->retry = 1;
 302                         break;
 303 #endif /* defined(CONFIG_NFS_V4_1) */
 304                 case -NFS4ERR_FILE_OPEN:
 305                         if (exception->timeout > HZ) {
 306                                 /* We have retried a decent amount, time to
 307                                  * fail
 308                                  */
 309                                 ret = -EBUSY;
 310                                 break;
 311                         }
 312                 case -NFS4ERR_GRACE:
 313                 case -NFS4ERR_DELAY:
 314                 case -EKEYEXPIRED:
 315                         ret = nfs4_delay(server->client, &exception->timeout);
 316                         if (ret != 0)
 317                                 break;
 318                 case -NFS4ERR_RETRY_UNCACHED_REP:
 319                 case -NFS4ERR_OLD_STATEID:
 320                         exception->retry = 1;
 321                         break;
 322                 case -NFS4ERR_BADOWNER:
 323                         /* The following works around a Linux server bug! */
 324                 case -NFS4ERR_BADNAME:
 325                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 326                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 327                                 exception->retry = 1;
 328                                 printk(KERN_WARNING "NFS: v4 server %s "
 329                                                 "does not accept raw "
 330                                                 "uid/gids. "
 331                                                 "Reenabling the idmapper.\n",
 332                                                 server->nfs_client->cl_hostname);
 333                         }
 334         }
 335         /* We failed to handle the error */
 336         return nfs4_map_errors(ret);
 337 wait_on_recovery:
 338         ret = nfs4_wait_clnt_recover(clp);
 339         if (ret == 0)
 340                 exception->retry = 1;
 341         return ret;
 342 }
 343
 344
 345 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 346 {
 347         spin_lock(&clp->cl_lock);
 348         if (time_before(clp->cl_last_renewal,timestamp))
 349                 clp->cl_last_renewal = timestamp;
 350         spin_unlock(&clp->cl_lock);
 351 }
 352
 353 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 354 {
 355         do_renew_lease(server->nfs_client, timestamp);
 356 }
 357
 358 #if defined(CONFIG_NFS_V4_1)
 359
 360 /*
 361  * nfs4_free_slot - free a slot and efficiently update slot table.
 362  *
 363  * freeing a slot is trivially done by clearing its respective bit
 364  * in the bitmap.
 365  * If the freed slotid equals highest_used_slotid we want to update it
 366  * so that the server would be able to size down the slot table if needed,
 367  * otherwise we know that the highest_used_slotid is still in use.
 368  * When updating highest_used_slotid there may be "holes" in the bitmap
 369  * so we need to scan down from highest_used_slotid to 0 looking for the now
 370  * highest slotid in use.
 371  * If none found, highest_used_slotid is set to -1.
 372  *
 373  * Must be called while holding tbl->slot_tbl_lock
 374  */
 375 static void
 376 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 377 {
 378         int free_slotid = free_slot - tbl->slots;
 379         int slotid = free_slotid;
 380
 381         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 382         /* clear used bit in bitmap */
 383         __clear_bit(slotid, tbl->used_slots);
 384
 385         /* update highest_used_slotid when it is freed */
 386         if (slotid == tbl->highest_used_slotid) {
 387                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 388                 if (slotid < tbl->max_slots)
 389                         tbl->highest_used_slotid = slotid;
 390                 else
 391                         tbl->highest_used_slotid = -1;
 392         }
 393         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 394                 free_slotid, tbl->highest_used_slotid);
 395 }
 396
 397 /*
 398  * Signal state manager thread if session fore channel is drained
 399  */
 400 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 401 {
 402         struct rpc_task *task;
 403
 404         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 405                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 406                 if (task)
 407                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 408                 return;
 409         }
 410
 411         if (ses->fc_slot_table.highest_used_slotid != -1)
 412                 return;
 413
 414         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 415         complete(&ses->fc_slot_table.complete);
 416 }
 417
 418 /*
 419  * Signal state manager thread if session back channel is drained
 420  */
 421 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 422 {
 423         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 424             ses->bc_slot_table.highest_used_slotid != -1)
 425                 return;
 426         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 427         complete(&ses->bc_slot_table.complete);
 428 }
 429
 430 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 431 {
 432         struct nfs4_slot_table *tbl;
 433
 434         tbl = &res->sr_session->fc_slot_table;
 435         if (!res->sr_slot) {
 436                 /* just wake up the next guy waiting since
 437                  * we may have not consumed a slot after all */
 438                 dprintk("%s: No slot\n", __func__);
 439                 return;
 440         }
 441
 442         spin_lock(&tbl->slot_tbl_lock);
 443         nfs4_free_slot(tbl, res->sr_slot);
 444         nfs4_check_drain_fc_complete(res->sr_session);
 445         spin_unlock(&tbl->slot_tbl_lock);
 446         res->sr_slot = NULL;
 447 }
 448
 449 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 450 {
 451         unsigned long timestamp;
 452         struct nfs_client *clp;
 453
 454         /*
 455          * sr_status remains 1 if an RPC level error occurred. The server
 456          * may or may not have processed the sequence operation..
 457          * Proceed as if the server received and processed the sequence
 458          * operation.
 459          */
 460         if (res->sr_status == 1)
 461                 res->sr_status = NFS_OK;
 462
 463         /* don't increment the sequence number if the task wasn't sent */
 464         if (!RPC_WAS_SENT(task))
 465                 goto out;
 466
 467         /* Check the SEQUENCE operation status */
 468         switch (res->sr_status) {
 469         case 0:
 470                 /* Update the slot's sequence and clientid lease timer */
 471                 ++res->sr_slot->seq_nr;
 472                 timestamp = res->sr_renewal_time;
 473                 clp = res->sr_session->clp;
 474                 do_renew_lease(clp, timestamp);
 475                 /* Check sequence flags */
 476                 if (res->sr_status_flags != 0)
 477                         nfs4_schedule_lease_recovery(clp);
 478                 break;
 479         case -NFS4ERR_DELAY:
 480                 /* The server detected a resend of the RPC call and
 481                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 482                  * of RFC5661.
 483                  */
 484                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 485                         __func__,
 486                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 487                         res->sr_slot->seq_nr);
 488                 goto out_retry;
 489         default:
 490                 /* Just update the slot sequence no. */
 491                 ++res->sr_slot->seq_nr;
 492         }
 493 out:
 494         /* The session may be reset by one of the error handlers. */
 495         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 496         nfs41_sequence_free_slot(res);
 497         return 1;
 498 out_retry:
 499         if (!rpc_restart_call(task))
 500                 goto out;
 501         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 502         return 0;
 503 }
 504
 505 static int nfs4_sequence_done(struct rpc_task *task,
 506                                struct nfs4_sequence_res *res)
 507 {
 508         if (res->sr_session == NULL)
 509                 return 1;
 510         return nfs41_sequence_done(task, res);
 511 }
 512
 513 /*
 514  * nfs4_find_slot - efficiently look for a free slot
 515  *
 516  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 517  * If found, we mark the slot as used, update the highest_used_slotid,
 518  * and respectively set up the sequence operation args.
 519  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 520  *
 521  * Note: must be called with under the slot_tbl_lock.
 522  */
 523 static u8
 524 nfs4_find_slot(struct nfs4_slot_table *tbl)
 525 {
 526         int slotid;
 527         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 528         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 529
 530         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 531                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 532                 tbl->max_slots);
 533         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 534         if (slotid >= tbl->max_slots)
 535                 goto out;
 536         __set_bit(slotid, tbl->used_slots);
 537         if (slotid > tbl->highest_used_slotid)
 538                 tbl->highest_used_slotid = slotid;
 539         ret_id = slotid;
 540 out:
 541         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 542                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 543         return ret_id;
 544 }
 545
 546 int nfs41_setup_sequence(struct nfs4_session *session,
 547                                 struct nfs4_sequence_args *args,
 548                                 struct nfs4_sequence_res *res,
 549                                 int cache_reply,
 550                                 struct rpc_task *task)
 551 {
 552         struct nfs4_slot *slot;
 553         struct nfs4_slot_table *tbl;
 554         u8 slotid;
 555
 556         dprintk("--> %s\n", __func__);
 557         /* slot already allocated? */
 558         if (res->sr_slot != NULL)
 559                 return 0;
 560
 561         tbl = &session->fc_slot_table;
 562
 563         spin_lock(&tbl->slot_tbl_lock);
 564         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 565             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 566                 /*
 567                  * The state manager will wait until the slot table is empty.
 568                  * Schedule the reset thread
 569                  */
 570                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 571                 spin_unlock(&tbl->slot_tbl_lock);
 572                 dprintk("%s Schedule Session Reset\n", __func__);
 573                 return -EAGAIN;
 574         }
 575
 576         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 577             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 578                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 579                 spin_unlock(&tbl->slot_tbl_lock);
 580                 dprintk("%s enforce FIFO order\n", __func__);
 581                 return -EAGAIN;
 582         }
 583
 584         slotid = nfs4_find_slot(tbl);
 585         if (slotid == NFS4_MAX_SLOT_TABLE) {
 586                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 587                 spin_unlock(&tbl->slot_tbl_lock);
 588                 dprintk("<-- %s: no free slots\n", __func__);
 589                 return -EAGAIN;
 590         }
 591         spin_unlock(&tbl->slot_tbl_lock);
 592
 593         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 594         slot = tbl->slots + slotid;
 595         args->sa_session = session;
 596         args->sa_slotid = slotid;
 597         args->sa_cache_this = cache_reply;
 598
 599         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 600
 601         res->sr_session = session;
 602         res->sr_slot = slot;
 603         res->sr_renewal_time = jiffies;
 604         res->sr_status_flags = 0;
 605         /*
 606          * sr_status is only set in decode_sequence, and so will remain
 607          * set to 1 if an rpc level failure occurs.
 608          */
 609         res->sr_status = 1;
 610         return 0;
 611 }
 612 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 613
 614 int nfs4_setup_sequence(const struct nfs_server *server,
 615                         struct nfs4_sequence_args *args,
 616                         struct nfs4_sequence_res *res,
 617                         int cache_reply,
 618                         struct rpc_task *task)
 619 {
 620         struct nfs4_session *session = nfs4_get_session(server);
 621         int ret = 0;
 622
 623         if (session == NULL) {
 624                 args->sa_session = NULL;
 625                 res->sr_session = NULL;
 626                 goto out;
 627         }
 628
 629         dprintk("--> %s clp %p session %p sr_slot %td\n",
 630                 __func__, session->clp, session, res->sr_slot ?
 631                         res->sr_slot - session->fc_slot_table.slots : -1);
 632
 633         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 634                                    task);
 635 out:
 636         dprintk("<-- %s status=%d\n", __func__, ret);
 637         return ret;
 638 }
 639
 640 struct nfs41_call_sync_data {
 641         const struct nfs_server *seq_server;
 642         struct nfs4_sequence_args *seq_args;
 643         struct nfs4_sequence_res *seq_res;
 644         int cache_reply;
 645 };
 646
 647 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 648 {
 649         struct nfs41_call_sync_data *data = calldata;
 650
 651         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 652
 653         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 654                                 data->seq_res, data->cache_reply, task))
 655                 return;
 656         rpc_call_start(task);
 657 }
 658
 659 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 660 {
 661         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 662         nfs41_call_sync_prepare(task, calldata);
 663 }
 664
 665 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 666 {
 667         struct nfs41_call_sync_data *data = calldata;
 668
 669         nfs41_sequence_done(task, data->seq_res);
 670 }
 671
 672 struct rpc_call_ops nfs41_call_sync_ops = {
 673         .rpc_call_prepare = nfs41_call_sync_prepare,
 674         .rpc_call_done = nfs41_call_sync_done,
 675 };
 676
 677 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 678         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 679         .rpc_call_done = nfs41_call_sync_done,
 680 };
 681
 682 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 683                                    struct nfs_server *server,
 684                                    struct rpc_message *msg,
 685                                    struct nfs4_sequence_args *args,
 686                                    struct nfs4_sequence_res *res,
 687                                    int cache_reply,
 688                                    int privileged)
 689 {
 690         int ret;
 691         struct rpc_task *task;
 692         struct nfs41_call_sync_data data = {
 693                 .seq_server = server,
 694                 .seq_args = args,
 695                 .seq_res = res,
 696                 .cache_reply = cache_reply,
 697         };
 698         struct rpc_task_setup task_setup = {
 699                 .rpc_client = clnt,
 700                 .rpc_message = msg,
 701                 .callback_ops = &nfs41_call_sync_ops,
 702                 .callback_data = &data
 703         };
 704
 705         res->sr_slot = NULL;
 706         if (privileged)
 707                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 708         task = rpc_run_task(&task_setup);
 709         if (IS_ERR(task))
 710                 ret = PTR_ERR(task);
 711         else {
 712                 ret = task->tk_status;
 713                 rpc_put_task(task);
 714         }
 715         return ret;
 716 }
 717
 718 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 719                             struct nfs_server *server,
 720                             struct rpc_message *msg,
 721                             struct nfs4_sequence_args *args,
 722                             struct nfs4_sequence_res *res,
 723                             int cache_reply)
 724 {
 725         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 726 }
 727
 728 #else
 729 static int nfs4_sequence_done(struct rpc_task *task,
 730                                struct nfs4_sequence_res *res)
 731 {
 732         return 1;
 733 }
 734 #endif /* CONFIG_NFS_V4_1 */
 735
 736 int _nfs4_call_sync(struct rpc_clnt *clnt,
 737                     struct nfs_server *server,
 738                     struct rpc_message *msg,
 739                     struct nfs4_sequence_args *args,
 740                     struct nfs4_sequence_res *res,
 741                     int cache_reply)
 742 {
 743         args->sa_session = res->sr_session = NULL;
 744         return rpc_call_sync(clnt, msg, 0);
 745 }
 746
 747 static inline
 748 int nfs4_call_sync(struct rpc_clnt *clnt,
 749                    struct nfs_server *server,
 750                    struct rpc_message *msg,
 751                    struct nfs4_sequence_args *args,
 752                    struct nfs4_sequence_res *res,
 753                    int cache_reply)
 754 {
 755         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 756                                                 args, res, cache_reply);
 757 }
 758
 759 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 760 {
 761         struct nfs_inode *nfsi = NFS_I(dir);
 762
 763         spin_lock(&dir->i_lock);
 764         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 765         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 766                 nfs_force_lookup_revalidate(dir);
 767         nfsi->change_attr = cinfo->after;
 768         spin_unlock(&dir->i_lock);
 769 }
 770
 771 struct nfs4_opendata {
 772         struct kref kref;
 773         struct nfs_openargs o_arg;
 774         struct nfs_openres o_res;
 775         struct nfs_open_confirmargs c_arg;
 776         struct nfs_open_confirmres c_res;
 777         struct nfs_fattr f_attr;
 778         struct nfs_fattr dir_attr;
 779         struct path path;
 780         struct dentry *dir;
 781         struct nfs4_state_owner *owner;
 782         struct nfs4_state *state;
 783         struct iattr attrs;
 784         unsigned long timestamp;
 785         unsigned int rpc_done : 1;
 786         int rpc_status;
 787         int cancelled;
 788 };
 789
 790
 791 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 792 {
 793         p->o_res.f_attr = &p->f_attr;
 794         p->o_res.dir_attr = &p->dir_attr;
 795         p->o_res.seqid = p->o_arg.seqid;
 796         p->c_res.seqid = p->c_arg.seqid;
 797         p->o_res.server = p->o_arg.server;
 798         nfs_fattr_init(&p->f_attr);
 799         nfs_fattr_init(&p->dir_attr);
 800 }
 801
 802 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 803                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 804                 const struct iattr *attrs,
 805                 gfp_t gfp_mask)
 806 {
 807         struct dentry *parent = dget_parent(path->dentry);
 808         struct inode *dir = parent->d_inode;
 809         struct nfs_server *server = NFS_SERVER(dir);
 810         struct nfs4_opendata *p;
 811
 812         p = kzalloc(sizeof(*p), gfp_mask);
 813         if (p == NULL)
 814                 goto err;
 815         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 816         if (p->o_arg.seqid == NULL)
 817                 goto err_free;
 818         path_get(path);
 819         p->path = *path;
 820         p->dir = parent;
 821         p->owner = sp;
 822         atomic_inc(&sp->so_count);
 823         p->o_arg.fh = NFS_FH(dir);
 824         p->o_arg.open_flags = flags;
 825         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 826         p->o_arg.clientid = server->nfs_client->cl_clientid;
 827         p->o_arg.id = sp->so_owner_id.id;
 828         p->o_arg.name = &p->path.dentry->d_name;
 829         p->o_arg.server = server;
 830         p->o_arg.bitmask = server->attr_bitmask;
 831         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 832         if (flags & O_CREAT) {
 833                 u32 *s;
 834
 835                 p->o_arg.u.attrs = &p->attrs;
 836                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 837                 s = (u32 *) p->o_arg.u.verifier.data;
 838                 s[0] = jiffies;
 839                 s[1] = current->pid;
 840         }
 841         p->c_arg.fh = &p->o_res.fh;
 842         p->c_arg.stateid = &p->o_res.stateid;
 843         p->c_arg.seqid = p->o_arg.seqid;
 844         nfs4_init_opendata_res(p);
 845         kref_init(&p->kref);
 846         return p;
 847 err_free:
 848         kfree(p);
 849 err:
 850         dput(parent);
 851         return NULL;
 852 }
 853
 854 static void nfs4_opendata_free(struct kref *kref)
 855 {
 856         struct nfs4_opendata *p = container_of(kref,
 857                         struct nfs4_opendata, kref);
 858
 859         nfs_free_seqid(p->o_arg.seqid);
 860         if (p->state != NULL)
 861                 nfs4_put_open_state(p->state);
 862         nfs4_put_state_owner(p->owner);
 863         dput(p->dir);
 864         path_put(&p->path);
 865         kfree(p);
 866 }
 867
 868 static void nfs4_opendata_put(struct nfs4_opendata *p)
 869 {
 870         if (p != NULL)
 871                 kref_put(&p->kref, nfs4_opendata_free);
 872 }
 873
 874 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 875 {
 876         int ret;
 877
 878         ret = rpc_wait_for_completion_task(task);
 879         return ret;
 880 }
 881
 882 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 883 {
 884         int ret = 0;
 885
 886         if (open_mode & O_EXCL)
 887                 goto out;
 888         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 889                 case FMODE_READ:
 890                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 891                                 && state->n_rdonly != 0;
 892                         break;
 893                 case FMODE_WRITE:
 894                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 895                                 && state->n_wronly != 0;
 896                         break;
 897                 case FMODE_READ|FMODE_WRITE:
 898                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 899                                 && state->n_rdwr != 0;
 900         }
 901 out:
 902         return ret;
 903 }
 904
 905 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 906 {
 907         if ((delegation->type & fmode) != fmode)
 908                 return 0;
 909         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 910                 return 0;
 911         nfs_mark_delegation_referenced(delegation);
 912         return 1;
 913 }
 914
 915 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 916 {
 917         switch (fmode) {
 918                 case FMODE_WRITE:
 919                         state->n_wronly++;
 920                         break;
 921                 case FMODE_READ:
 922                         state->n_rdonly++;
 923                         break;
 924                 case FMODE_READ|FMODE_WRITE:
 925                         state->n_rdwr++;
 926         }
 927         nfs4_state_set_mode_locked(state, state->state | fmode);
 928 }
 929
 930 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 931 {
 932         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 933                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 934         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 935         switch (fmode) {
 936                 case FMODE_READ:
 937                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 938                         break;
 939                 case FMODE_WRITE:
 940                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 941                         break;
 942                 case FMODE_READ|FMODE_WRITE:
 943                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 944         }
 945 }
 946
 947 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 948 {
 949         write_seqlock(&state->seqlock);
 950         nfs_set_open_stateid_locked(state, stateid, fmode);
 951         write_sequnlock(&state->seqlock);
 952 }
 953
 954 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 955 {
 956         /*
 957          * Protect the call to nfs4_state_set_mode_locked and
 958          * serialise the stateid update
 959          */
 960         write_seqlock(&state->seqlock);
 961         if (deleg_stateid != NULL) {
 962                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 963                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 964         }
 965         if (open_stateid != NULL)
 966                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 967         write_sequnlock(&state->seqlock);
 968         spin_lock(&state->owner->so_lock);
 969         update_open_stateflags(state, fmode);
 970         spin_unlock(&state->owner->so_lock);
 971 }
 972
 973 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 974 {
 975         struct nfs_inode *nfsi = NFS_I(state->inode);
 976         struct nfs_delegation *deleg_cur;
 977         int ret = 0;
 978
 979         fmode &= (FMODE_READ|FMODE_WRITE);
 980
 981         rcu_read_lock();
 982         deleg_cur = rcu_dereference(nfsi->delegation);
 983         if (deleg_cur == NULL)
 984                 goto no_delegation;
 985
 986         spin_lock(&deleg_cur->lock);
 987         if (nfsi->delegation != deleg_cur ||
 988             (deleg_cur->type & fmode) != fmode)
 989                 goto no_delegation_unlock;
 990
 991         if (delegation == NULL)
 992                 delegation = &deleg_cur->stateid;
 993         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 994                 goto no_delegation_unlock;
 995
 996         nfs_mark_delegation_referenced(deleg_cur);
 997         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 998         ret = 1;
 999 no_delegation_unlock:
1000         spin_unlock(&deleg_cur->lock);
1001 no_delegation:
1002         rcu_read_unlock();
1003
1004         if (!ret && open_stateid != NULL) {
1005                 __update_open_stateid(state, open_stateid, NULL, fmode);
1006                 ret = 1;
1007         }
1008
1009         return ret;
1010 }
1011
1012
1013 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1014 {
1015         struct nfs_delegation *delegation;
1016
1017         rcu_read_lock();
1018         delegation = rcu_dereference(NFS_I(inode)->delegation);
1019         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1020                 rcu_read_unlock();
1021                 return;
1022         }
1023         rcu_read_unlock();
1024         nfs_inode_return_delegation(inode);
1025 }
1026
1027 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1028 {
1029         struct nfs4_state *state = opendata->state;
1030         struct nfs_inode *nfsi = NFS_I(state->inode);
1031         struct nfs_delegation *delegation;
1032         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1033         fmode_t fmode = opendata->o_arg.fmode;
1034         nfs4_stateid stateid;
1035         int ret = -EAGAIN;
1036
1037         for (;;) {
1038                 if (can_open_cached(state, fmode, open_mode)) {
1039                         spin_lock(&state->owner->so_lock);
1040                         if (can_open_cached(state, fmode, open_mode)) {
1041                                 update_open_stateflags(state, fmode);
1042                                 spin_unlock(&state->owner->so_lock);
1043                                 goto out_return_state;
1044                         }
1045                         spin_unlock(&state->owner->so_lock);
1046                 }
1047                 rcu_read_lock();
1048                 delegation = rcu_dereference(nfsi->delegation);
1049                 if (delegation == NULL ||
1050                     !can_open_delegated(delegation, fmode)) {
1051                         rcu_read_unlock();
1052                         break;
1053                 }
1054                 /* Save the delegation */
1055                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1056                 rcu_read_unlock();
1057                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1058                 if (ret != 0)
1059                         goto out;
1060                 ret = -EAGAIN;
1061
1062                 /* Try to update the stateid using the delegation */
1063                 if (update_open_stateid(state, NULL, &stateid, fmode))
1064                         goto out_return_state;
1065         }
1066 out:
1067         return ERR_PTR(ret);
1068 out_return_state:
1069         atomic_inc(&state->count);
1070         return state;
1071 }
1072
1073 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1074 {
1075         struct inode *inode;
1076         struct nfs4_state *state = NULL;
1077         struct nfs_delegation *delegation;
1078         int ret;
1079
1080         if (!data->rpc_done) {
1081                 state = nfs4_try_open_cached(data);
1082                 goto out;
1083         }
1084
1085         ret = -EAGAIN;
1086         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1087                 goto err;
1088         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1089         ret = PTR_ERR(inode);
1090         if (IS_ERR(inode))
1091                 goto err;
1092         ret = -ENOMEM;
1093         state = nfs4_get_open_state(inode, data->owner);
1094         if (state == NULL)
1095                 goto err_put_inode;
1096         if (data->o_res.delegation_type != 0) {
1097                 int delegation_flags = 0;
1098
1099                 rcu_read_lock();
1100                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1101                 if (delegation)
1102                         delegation_flags = delegation->flags;
1103                 rcu_read_unlock();
1104                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1105                         nfs_inode_set_delegation(state->inode,
1106                                         data->owner->so_cred,
1107                                         &data->o_res);
1108                 else
1109                         nfs_inode_reclaim_delegation(state->inode,
1110                                         data->owner->so_cred,
1111                                         &data->o_res);
1112         }
1113
1114         update_open_stateid(state, &data->o_res.stateid, NULL,
1115                         data->o_arg.fmode);
1116         iput(inode);
1117 out:
1118         return state;
1119 err_put_inode:
1120         iput(inode);
1121 err:
1122         return ERR_PTR(ret);
1123 }
1124
1125 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1126 {
1127         struct nfs_inode *nfsi = NFS_I(state->inode);
1128         struct nfs_open_context *ctx;
1129
1130         spin_lock(&state->inode->i_lock);
1131         list_for_each_entry(ctx, &nfsi->open_files, list) {
1132                 if (ctx->state != state)
1133                         continue;
1134                 get_nfs_open_context(ctx);
1135                 spin_unlock(&state->inode->i_lock);
1136                 return ctx;
1137         }
1138         spin_unlock(&state->inode->i_lock);
1139         return ERR_PTR(-ENOENT);
1140 }
1141
1142 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1143 {
1144         struct nfs4_opendata *opendata;
1145
1146         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1147         if (opendata == NULL)
1148                 return ERR_PTR(-ENOMEM);
1149         opendata->state = state;
1150         atomic_inc(&state->count);
1151         return opendata;
1152 }
1153
1154 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1155 {
1156         struct nfs4_state *newstate;
1157         int ret;
1158
1159         opendata->o_arg.open_flags = 0;
1160         opendata->o_arg.fmode = fmode;
1161         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1162         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1163         nfs4_init_opendata_res(opendata);
1164         ret = _nfs4_recover_proc_open(opendata);
1165         if (ret != 0)
1166                 return ret;
1167         newstate = nfs4_opendata_to_nfs4_state(opendata);
1168         if (IS_ERR(newstate))
1169                 return PTR_ERR(newstate);
1170         nfs4_close_state(&opendata->path, newstate, fmode);
1171         *res = newstate;
1172         return 0;
1173 }
1174
1175 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1176 {
1177         struct nfs4_state *newstate;
1178         int ret;
1179
1180         /* memory barrier prior to reading state->n_* */
1181         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1182         smp_rmb();
1183         if (state->n_rdwr != 0) {
1184                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1185                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1186                 if (ret != 0)
1187                         return ret;
1188                 if (newstate != state)
1189                         return -ESTALE;
1190         }
1191         if (state->n_wronly != 0) {
1192                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1193                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1194                 if (ret != 0)
1195                         return ret;
1196                 if (newstate != state)
1197                         return -ESTALE;
1198         }
1199         if (state->n_rdonly != 0) {
1200                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1201                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1202                 if (ret != 0)
1203                         return ret;
1204                 if (newstate != state)
1205                         return -ESTALE;
1206         }
1207         /*
1208          * We may have performed cached opens for all three recoveries.
1209          * Check if we need to update the current stateid.
1210          */
1211         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1212             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1213                 write_seqlock(&state->seqlock);
1214                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1215                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1216                 write_sequnlock(&state->seqlock);
1217         }
1218         return 0;
1219 }
1220
1221 /*
1222  * OPEN_RECLAIM:
1223  *      reclaim state on the server after a reboot.
1224  */
1225 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1226 {
1227         struct nfs_delegation *delegation;
1228         struct nfs4_opendata *opendata;
1229         fmode_t delegation_type = 0;
1230         int status;
1231
1232         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1233         if (IS_ERR(opendata))
1234                 return PTR_ERR(opendata);
1235         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1236         opendata->o_arg.fh = NFS_FH(state->inode);
1237         rcu_read_lock();
1238         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1239         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1240                 delegation_type = delegation->type;
1241         rcu_read_unlock();
1242         opendata->o_arg.u.delegation_type = delegation_type;
1243         status = nfs4_open_recover(opendata, state);
1244         nfs4_opendata_put(opendata);
1245         return status;
1246 }
1247
1248 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1249 {
1250         struct nfs_server *server = NFS_SERVER(state->inode);
1251         struct nfs4_exception exception = { };
1252         int err;
1253         do {
1254                 err = _nfs4_do_open_reclaim(ctx, state);
1255                 if (err != -NFS4ERR_DELAY)
1256                         break;
1257                 nfs4_handle_exception(server, err, &exception);
1258         } while (exception.retry);
1259         return err;
1260 }
1261
1262 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1263 {
1264         struct nfs_open_context *ctx;
1265         int ret;
1266
1267         ctx = nfs4_state_find_open_context(state);
1268         if (IS_ERR(ctx))
1269                 return PTR_ERR(ctx);
1270         ret = nfs4_do_open_reclaim(ctx, state);
1271         put_nfs_open_context(ctx);
1272         return ret;
1273 }
1274
1275 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1276 {
1277         struct nfs4_opendata *opendata;
1278         int ret;
1279
1280         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1281         if (IS_ERR(opendata))
1282                 return PTR_ERR(opendata);
1283         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1284         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1285                         sizeof(opendata->o_arg.u.delegation.data));
1286         ret = nfs4_open_recover(opendata, state);
1287         nfs4_opendata_put(opendata);
1288         return ret;
1289 }
1290
1291 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1292 {
1293         struct nfs4_exception exception = { };
1294         struct nfs_server *server = NFS_SERVER(state->inode);
1295         int err;
1296         do {
1297                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1298                 switch (err) {
1299                         case 0:
1300                         case -ENOENT:
1301                         case -ESTALE:
1302                                 goto out;
1303                         case -NFS4ERR_BADSESSION:
1304                         case -NFS4ERR_BADSLOT:
1305                         case -NFS4ERR_BAD_HIGH_SLOT:
1306                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1307                         case -NFS4ERR_DEADSESSION:
1308                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1309                                 goto out;
1310                         case -NFS4ERR_STALE_CLIENTID:
1311                         case -NFS4ERR_STALE_STATEID:
1312                         case -NFS4ERR_EXPIRED:
1313                                 /* Don't recall a delegation if it was lost */
1314                                 nfs4_schedule_lease_recovery(server->nfs_client);
1315                                 goto out;
1316                         case -ERESTARTSYS:
1317                                 /*
1318                                  * The show must go on: exit, but mark the
1319                                  * stateid as needing recovery.
1320                                  */
1321                         case -NFS4ERR_DELEG_REVOKED:
1322                         case -NFS4ERR_ADMIN_REVOKED:
1323                         case -NFS4ERR_BAD_STATEID:
1324                                 nfs_inode_find_state_and_recover(state->inode,
1325                                                 stateid);
1326                                 nfs4_schedule_stateid_recovery(server, state);
1327                         case -EKEYEXPIRED:
1328                                 /*
1329                                  * User RPCSEC_GSS context has expired.
1330                                  * We cannot recover this stateid now, so
1331                                  * skip it and allow recovery thread to
1332                                  * proceed.
1333                                  */
1334                         case -ENOMEM:
1335                                 err = 0;
1336                                 goto out;
1337                 }
1338                 err = nfs4_handle_exception(server, err, &exception);
1339         } while (exception.retry);
1340 out:
1341         return err;
1342 }
1343
1344 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1345 {
1346         struct nfs4_opendata *data = calldata;
1347
1348         data->rpc_status = task->tk_status;
1349         if (data->rpc_status == 0) {
1350                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1351                                 sizeof(data->o_res.stateid.data));
1352                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1353                 renew_lease(data->o_res.server, data->timestamp);
1354                 data->rpc_done = 1;
1355         }
1356 }
1357
1358 static void nfs4_open_confirm_release(void *calldata)
1359 {
1360         struct nfs4_opendata *data = calldata;
1361         struct nfs4_state *state = NULL;
1362
1363         /* If this request hasn't been cancelled, do nothing */
1364         if (data->cancelled == 0)
1365                 goto out_free;
1366         /* In case of error, no cleanup! */
1367         if (!data->rpc_done)
1368                 goto out_free;
1369         state = nfs4_opendata_to_nfs4_state(data);
1370         if (!IS_ERR(state))
1371                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1372 out_free:
1373         nfs4_opendata_put(data);
1374 }
1375
1376 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1377         .rpc_call_done = nfs4_open_confirm_done,
1378         .rpc_release = nfs4_open_confirm_release,
1379 };
1380
1381 /*
1382  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1383  */
1384 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1385 {
1386         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1387         struct rpc_task *task;
1388         struct  rpc_message msg = {
1389                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1390                 .rpc_argp = &data->c_arg,
1391                 .rpc_resp = &data->c_res,
1392                 .rpc_cred = data->owner->so_cred,
1393         };
1394         struct rpc_task_setup task_setup_data = {
1395                 .rpc_client = server->client,
1396                 .rpc_message = &msg,
1397                 .callback_ops = &nfs4_open_confirm_ops,
1398                 .callback_data = data,
1399                 .workqueue = nfsiod_workqueue,
1400                 .flags = RPC_TASK_ASYNC,
1401         };
1402         int status;
1403
1404         kref_get(&data->kref);
1405         data->rpc_done = 0;
1406         data->rpc_status = 0;
1407         data->timestamp = jiffies;
1408         task = rpc_run_task(&task_setup_data);
1409         if (IS_ERR(task))
1410                 return PTR_ERR(task);
1411         status = nfs4_wait_for_completion_rpc_task(task);
1412         if (status != 0) {
1413                 data->cancelled = 1;
1414                 smp_wmb();
1415         } else
1416                 status = data->rpc_status;
1417         rpc_put_task(task);
1418         return status;
1419 }
1420
1421 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1422 {
1423         struct nfs4_opendata *data = calldata;
1424         struct nfs4_state_owner *sp = data->owner;
1425
1426         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1427                 return;
1428         /*
1429          * Check if we still need to send an OPEN call, or if we can use
1430          * a delegation instead.
1431          */
1432         if (data->state != NULL) {
1433                 struct nfs_delegation *delegation;
1434
1435                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1436                         goto out_no_action;
1437                 rcu_read_lock();
1438                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1439                 if (delegation != NULL &&
1440                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1441                         rcu_read_unlock();
1442                         goto out_no_action;
1443                 }
1444                 rcu_read_unlock();
1445         }
1446         /* Update sequence id. */
1447         data->o_arg.id = sp->so_owner_id.id;
1448         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1449         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1450                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1451                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1452         }
1453         data->timestamp = jiffies;
1454         if (nfs4_setup_sequence(data->o_arg.server,
1455                                 &data->o_arg.seq_args,
1456                                 &data->o_res.seq_res, 1, task))
1457                 return;
1458         rpc_call_start(task);
1459         return;
1460 out_no_action:
1461         task->tk_action = NULL;
1462
1463 }
1464
1465 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1466 {
1467         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1468         nfs4_open_prepare(task, calldata);
1469 }
1470
1471 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1472 {
1473         struct nfs4_opendata *data = calldata;
1474
1475         data->rpc_status = task->tk_status;
1476
1477         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1478                 return;
1479
1480         if (task->tk_status == 0) {
1481                 switch (data->o_res.f_attr->mode & S_IFMT) {
1482                         case S_IFREG:
1483                                 break;
1484                         case S_IFLNK:
1485                                 data->rpc_status = -ELOOP;
1486                                 break;
1487                         case S_IFDIR:
1488                                 data->rpc_status = -EISDIR;
1489                                 break;
1490                         default:
1491                                 data->rpc_status = -ENOTDIR;
1492                 }
1493                 renew_lease(data->o_res.server, data->timestamp);
1494                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1495                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1496         }
1497         data->rpc_done = 1;
1498 }
1499
1500 static void nfs4_open_release(void *calldata)
1501 {
1502         struct nfs4_opendata *data = calldata;
1503         struct nfs4_state *state = NULL;
1504
1505         /* If this request hasn't been cancelled, do nothing */
1506         if (data->cancelled == 0)
1507                 goto out_free;
1508         /* In case of error, no cleanup! */
1509         if (data->rpc_status != 0 || !data->rpc_done)
1510                 goto out_free;
1511         /* In case we need an open_confirm, no cleanup! */
1512         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1513                 goto out_free;
1514         state = nfs4_opendata_to_nfs4_state(data);
1515         if (!IS_ERR(state))
1516                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1517 out_free:
1518         nfs4_opendata_put(data);
1519 }
1520
1521 static const struct rpc_call_ops nfs4_open_ops = {
1522         .rpc_call_prepare = nfs4_open_prepare,
1523         .rpc_call_done = nfs4_open_done,
1524         .rpc_release = nfs4_open_release,
1525 };
1526
1527 static const struct rpc_call_ops nfs4_recover_open_ops = {
1528         .rpc_call_prepare = nfs4_recover_open_prepare,
1529         .rpc_call_done = nfs4_open_done,
1530         .rpc_release = nfs4_open_release,
1531 };
1532
1533 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1534 {
1535         struct inode *dir = data->dir->d_inode;
1536         struct nfs_server *server = NFS_SERVER(dir);
1537         struct nfs_openargs *o_arg = &data->o_arg;
1538         struct nfs_openres *o_res = &data->o_res;
1539         struct rpc_task *task;
1540         struct rpc_message msg = {
1541                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1542                 .rpc_argp = o_arg,
1543                 .rpc_resp = o_res,
1544                 .rpc_cred = data->owner->so_cred,
1545         };
1546         struct rpc_task_setup task_setup_data = {
1547                 .rpc_client = server->client,
1548                 .rpc_message = &msg,
1549                 .callback_ops = &nfs4_open_ops,
1550                 .callback_data = data,
1551                 .workqueue = nfsiod_workqueue,
1552                 .flags = RPC_TASK_ASYNC,
1553         };
1554         int status;
1555
1556         kref_get(&data->kref);
1557         data->rpc_done = 0;
1558         data->rpc_status = 0;
1559         data->cancelled = 0;
1560         if (isrecover)
1561                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1562         task = rpc_run_task(&task_setup_data);
1563         if (IS_ERR(task))
1564                 return PTR_ERR(task);
1565         status = nfs4_wait_for_completion_rpc_task(task);
1566         if (status != 0) {
1567                 data->cancelled = 1;
1568                 smp_wmb();
1569         } else
1570                 status = data->rpc_status;
1571         rpc_put_task(task);
1572
1573         return status;
1574 }
1575
1576 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1577 {
1578         struct inode *dir = data->dir->d_inode;
1579         struct nfs_openres *o_res = &data->o_res;
1580         int status;
1581
1582         status = nfs4_run_open_task(data, 1);
1583         if (status != 0 || !data->rpc_done)
1584                 return status;
1585
1586         nfs_refresh_inode(dir, o_res->dir_attr);
1587
1588         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1589                 status = _nfs4_proc_open_confirm(data);
1590                 if (status != 0)
1591                         return status;
1592         }
1593
1594         return status;
1595 }
1596
1597 /*
1598  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1599  */
1600 static int _nfs4_proc_open(struct nfs4_opendata *data)
1601 {
1602         struct inode *dir = data->dir->d_inode;
1603         struct nfs_server *server = NFS_SERVER(dir);
1604         struct nfs_openargs *o_arg = &data->o_arg;
1605         struct nfs_openres *o_res = &data->o_res;
1606         int status;
1607
1608         status = nfs4_run_open_task(data, 0);
1609         if (status != 0 || !data->rpc_done)
1610                 return status;
1611
1612         if (o_arg->open_flags & O_CREAT) {
1613                 update_changeattr(dir, &o_res->cinfo);
1614                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1615         } else
1616                 nfs_refresh_inode(dir, o_res->dir_attr);
1617         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1618                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1619         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1620                 status = _nfs4_proc_open_confirm(data);
1621                 if (status != 0)
1622                         return status;
1623         }
1624         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1625                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1626         return 0;
1627 }
1628
1629 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1630 {
1631         unsigned int loop;
1632         int ret;
1633
1634         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1635                 ret = nfs4_wait_clnt_recover(clp);
1636                 if (ret != 0)
1637                         break;
1638                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1639                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1640                         break;
1641                 nfs4_schedule_state_manager(clp);
1642                 ret = -EIO;
1643         }
1644         return ret;
1645 }
1646
1647 static int nfs4_recover_expired_lease(struct nfs_server *server)
1648 {
1649         return nfs4_client_recover_expired_lease(server->nfs_client);
1650 }
1651
1652 /*
1653  * OPEN_EXPIRED:
1654  *      reclaim state on the server after a network partition.
1655  *      Assumes caller holds the appropriate lock
1656  */
1657 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1658 {
1659         struct nfs4_opendata *opendata;
1660         int ret;
1661
1662         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1663         if (IS_ERR(opendata))
1664                 return PTR_ERR(opendata);
1665         ret = nfs4_open_recover(opendata, state);
1666         if (ret == -ESTALE)
1667                 d_drop(ctx->path.dentry);
1668         nfs4_opendata_put(opendata);
1669         return ret;
1670 }
1671
1672 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1673 {
1674         struct nfs_server *server = NFS_SERVER(state->inode);
1675         struct nfs4_exception exception = { };
1676         int err;
1677
1678         do {
1679                 err = _nfs4_open_expired(ctx, state);
1680                 switch (err) {
1681                 default:
1682                         goto out;
1683                 case -NFS4ERR_GRACE:
1684                 case -NFS4ERR_DELAY:
1685                         nfs4_handle_exception(server, err, &exception);
1686                         err = 0;
1687                 }
1688         } while (exception.retry);
1689 out:
1690         return err;
1691 }
1692
1693 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1694 {
1695         struct nfs_open_context *ctx;
1696         int ret;
1697
1698         ctx = nfs4_state_find_open_context(state);
1699         if (IS_ERR(ctx))
1700                 return PTR_ERR(ctx);
1701         ret = nfs4_do_open_expired(ctx, state);
1702         put_nfs_open_context(ctx);
1703         return ret;
1704 }
1705
1706 /*
1707  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1708  * fields corresponding to attributes that were used to store the verifier.
1709  * Make sure we clobber those fields in the later setattr call
1710  */
1711 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1712 {
1713         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1714             !(sattr->ia_valid & ATTR_ATIME_SET))
1715                 sattr->ia_valid |= ATTR_ATIME;
1716
1717         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1718             !(sattr->ia_valid & ATTR_MTIME_SET))
1719                 sattr->ia_valid |= ATTR_MTIME;
1720 }
1721
1722 /*
1723  * Returns a referenced nfs4_state
1724  */
1725 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1726 {
1727         struct nfs4_state_owner  *sp;
1728         struct nfs4_state     *state = NULL;
1729         struct nfs_server       *server = NFS_SERVER(dir);
1730         struct nfs4_opendata *opendata;
1731         int status;
1732
1733         /* Protect against reboot recovery conflicts */
1734         status = -ENOMEM;
1735         if (!(sp = nfs4_get_state_owner(server, cred))) {
1736                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1737                 goto out_err;
1738         }
1739         status = nfs4_recover_expired_lease(server);
1740         if (status != 0)
1741                 goto err_put_state_owner;
1742         if (path->dentry->d_inode != NULL)
1743                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1744         status = -ENOMEM;
1745         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1746         if (opendata == NULL)
1747                 goto err_put_state_owner;
1748
1749         if (path->dentry->d_inode != NULL)
1750                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1751
1752         status = _nfs4_proc_open(opendata);
1753         if (status != 0)
1754                 goto err_opendata_put;
1755
1756         state = nfs4_opendata_to_nfs4_state(opendata);
1757         status = PTR_ERR(state);
1758         if (IS_ERR(state))
1759                 goto err_opendata_put;
1760         if (server->caps & NFS_CAP_POSIX_LOCK)
1761                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1762
1763         if (opendata->o_arg.open_flags & O_EXCL) {
1764                 nfs4_exclusive_attrset(opendata, sattr);
1765
1766                 nfs_fattr_init(opendata->o_res.f_attr);
1767                 status = nfs4_do_setattr(state->inode, cred,
1768                                 opendata->o_res.f_attr, sattr,
1769                                 state);
1770                 if (status == 0)
1771                         nfs_setattr_update_inode(state->inode, sattr);
1772                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1773         }
1774         nfs4_opendata_put(opendata);
1775         nfs4_put_state_owner(sp);
1776         *res = state;
1777         return 0;
1778 err_opendata_put:
1779         nfs4_opendata_put(opendata);
1780 err_put_state_owner:
1781         nfs4_put_state_owner(sp);
1782 out_err:
1783         *res = NULL;
1784         return status;
1785 }
1786
1787
1788 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1789 {
1790         struct nfs4_exception exception = { };
1791         struct nfs4_state *res;
1792         int status;
1793
1794         do {
1795                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1796                 if (status == 0)
1797                         break;
1798                 /* NOTE: BAD_SEQID means the server and client disagree about the
1799                  * book-keeping w.r.t. state-changing operations
1800                  * (OPEN/CLOSE/LOCK/LOCKU...)
1801                  * It is actually a sign of a bug on the client or on the server.
1802                  *
1803                  * If we receive a BAD_SEQID error in the particular case of
1804                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1805                  * have unhashed the old state_owner for us, and that we can
1806                  * therefore safely retry using a new one. We should still warn
1807                  * the user though...
1808                  */
1809                 if (status == -NFS4ERR_BAD_SEQID) {
1810                         printk(KERN_WARNING "NFS: v4 server %s "
1811                                         " returned a bad sequence-id error!\n",
1812                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1813                         exception.retry = 1;
1814                         continue;
1815                 }
1816                 /*
1817                  * BAD_STATEID on OPEN means that the server cancelled our
1818                  * state before it received the OPEN_CONFIRM.
1819                  * Recover by retrying the request as per the discussion
1820                  * on Page 181 of RFC3530.
1821                  */
1822                 if (status == -NFS4ERR_BAD_STATEID) {
1823                         exception.retry = 1;
1824                         continue;
1825                 }
1826                 if (status == -EAGAIN) {
1827                         /* We must have found a delegation */
1828                         exception.retry = 1;
1829                         continue;
1830                 }
1831                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1832                                         status, &exception));
1833         } while (exception.retry);
1834         return res;
1835 }
1836
1837 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1838                             struct nfs_fattr *fattr, struct iattr *sattr,
1839                             struct nfs4_state *state)
1840 {
1841         struct nfs_server *server = NFS_SERVER(inode);
1842         struct nfs_setattrargs  arg = {
1843                 .fh             = NFS_FH(inode),
1844                 .iap            = sattr,
1845                 .server         = server,
1846                 .bitmask = server->attr_bitmask,
1847         };
1848         struct nfs_setattrres  res = {
1849                 .fattr          = fattr,
1850                 .server         = server,
1851         };
1852         struct rpc_message msg = {
1853                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1854                 .rpc_argp       = &arg,
1855                 .rpc_resp       = &res,
1856                 .rpc_cred       = cred,
1857         };
1858         unsigned long timestamp = jiffies;
1859         int status;
1860
1861         nfs_fattr_init(fattr);
1862
1863         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1864                 /* Use that stateid */
1865         } else if (state != NULL) {
1866                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1867         } else
1868                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1869
1870         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1871         if (status == 0 && state != NULL)
1872                 renew_lease(server, timestamp);
1873         return status;
1874 }
1875
1876 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1877                            struct nfs_fattr *fattr, struct iattr *sattr,
1878                            struct nfs4_state *state)
1879 {
1880         struct nfs_server *server = NFS_SERVER(inode);
1881         struct nfs4_exception exception = {
1882                 .state = state,
1883                 .inode = inode,
1884         };
1885         int err;
1886         do {
1887                 err = nfs4_handle_exception(server,
1888                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1889                                 &exception);
1890         } while (exception.retry);
1891         return err;
1892 }
1893
1894 struct nfs4_closedata {
1895         struct path path;
1896         struct inode *inode;
1897         struct nfs4_state *state;
1898         struct nfs_closeargs arg;
1899         struct nfs_closeres res;
1900         struct nfs_fattr fattr;
1901         unsigned long timestamp;
1902         bool roc;
1903         u32 roc_barrier;
1904 };
1905
1906 static void nfs4_free_closedata(void *data)
1907 {
1908         struct nfs4_closedata *calldata = data;
1909         struct nfs4_state_owner *sp = calldata->state->owner;
1910
1911         if (calldata->roc)
1912                 pnfs_roc_release(calldata->state->inode);
1913         nfs4_put_open_state(calldata->state);
1914         nfs_free_seqid(calldata->arg.seqid);
1915         nfs4_put_state_owner(sp);
1916         path_put(&calldata->path);
1917         kfree(calldata);
1918 }
1919
1920 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1921                 fmode_t fmode)
1922 {
1923         spin_lock(&state->owner->so_lock);
1924         if (!(fmode & FMODE_READ))
1925                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1926         if (!(fmode & FMODE_WRITE))
1927                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1928         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1929         spin_unlock(&state->owner->so_lock);
1930 }
1931
1932 static void nfs4_close_done(struct rpc_task *task, void *data)
1933 {
1934         struct nfs4_closedata *calldata = data;
1935         struct nfs4_state *state = calldata->state;
1936         struct nfs_server *server = NFS_SERVER(calldata->inode);
1937
1938         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1939                 return;
1940         /* hmm. we are done with the inode, and in the process of freeing
1941          * the state_owner. we keep this around to process errors
1942          */
1943         switch (task->tk_status) {
1944                 case 0:
1945                         if (calldata->roc)
1946                                 pnfs_roc_set_barrier(state->inode,
1947                                                      calldata->roc_barrier);
1948                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1949                         renew_lease(server, calldata->timestamp);
1950                         nfs4_close_clear_stateid_flags(state,
1951                                         calldata->arg.fmode);
1952                         break;
1953                 case -NFS4ERR_STALE_STATEID:
1954                 case -NFS4ERR_OLD_STATEID:
1955                 case -NFS4ERR_BAD_STATEID:
1956                 case -NFS4ERR_EXPIRED:
1957                         if (calldata->arg.fmode == 0)
1958                                 break;
1959                 default:
1960                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1961                                 rpc_restart_call_prepare(task);
1962         }
1963         nfs_release_seqid(calldata->arg.seqid);
1964         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1965 }
1966
1967 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1968 {
1969         struct nfs4_closedata *calldata = data;
1970         struct nfs4_state *state = calldata->state;
1971         int call_close = 0;
1972
1973         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1974                 return;
1975
1976         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1977         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1978         spin_lock(&state->owner->so_lock);
1979         /* Calculate the change in open mode */
1980         if (state->n_rdwr == 0) {
1981                 if (state->n_rdonly == 0) {
1982                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1983                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1984                         calldata->arg.fmode &= ~FMODE_READ;
1985                 }
1986                 if (state->n_wronly == 0) {
1987                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1988                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1989                         calldata->arg.fmode &= ~FMODE_WRITE;
1990                 }
1991         }
1992         spin_unlock(&state->owner->so_lock);
1993
1994         if (!call_close) {
1995                 /* Note: exit _without_ calling nfs4_close_done */
1996                 task->tk_action = NULL;
1997                 return;
1998         }
1999
2000         if (calldata->arg.fmode == 0) {
2001                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2002                 if (calldata->roc &&
2003                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2004                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2005                                      task, NULL);
2006                         return;
2007                 }
2008         }
2009
2010         nfs_fattr_init(calldata->res.fattr);
2011         calldata->timestamp = jiffies;
2012         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2013                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2014                                 1, task))
2015                 return;
2016         rpc_call_start(task);
2017 }
2018
2019 static const struct rpc_call_ops nfs4_close_ops = {
2020         .rpc_call_prepare = nfs4_close_prepare,
2021         .rpc_call_done = nfs4_close_done,
2022         .rpc_release = nfs4_free_closedata,
2023 };
2024
2025 /*
2026  * It is possible for data to be read/written from a mem-mapped file
2027  * after the sys_close call (which hits the vfs layer as a flush).
2028  * This means that we can't safely call nfsv4 close on a file until
2029  * the inode is cleared. This in turn means that we are not good
2030  * NFSv4 citizens - we do not indicate to the server to update the file's
2031  * share state even when we are done with one of the three share
2032  * stateid's in the inode.
2033  *
2034  * NOTE: Caller must be holding the sp->so_owner semaphore!
2035  */
2036 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2037 {
2038         struct nfs_server *server = NFS_SERVER(state->inode);
2039         struct nfs4_closedata *calldata;
2040         struct nfs4_state_owner *sp = state->owner;
2041         struct rpc_task *task;
2042         struct rpc_message msg = {
2043                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2044                 .rpc_cred = state->owner->so_cred,
2045         };
2046         struct rpc_task_setup task_setup_data = {
2047                 .rpc_client = server->client,
2048                 .rpc_message = &msg,
2049                 .callback_ops = &nfs4_close_ops,
2050                 .workqueue = nfsiod_workqueue,
2051                 .flags = RPC_TASK_ASYNC,
2052         };
2053         int status = -ENOMEM;
2054
2055         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2056         if (calldata == NULL)
2057                 goto out;
2058         calldata->inode = state->inode;
2059         calldata->state = state;
2060         calldata->arg.fh = NFS_FH(state->inode);
2061         calldata->arg.stateid = &state->open_stateid;
2062         /* Serialization for the sequence id */
2063         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2064         if (calldata->arg.seqid == NULL)
2065                 goto out_free_calldata;
2066         calldata->arg.fmode = 0;
2067         calldata->arg.bitmask = server->cache_consistency_bitmask;
2068         calldata->res.fattr = &calldata->fattr;
2069         calldata->res.seqid = calldata->arg.seqid;
2070         calldata->res.server = server;
2071         calldata->roc = roc;
2072         path_get(path);
2073         calldata->path = *path;
2074
2075         msg.rpc_argp = &calldata->arg;
2076         msg.rpc_resp = &calldata->res;
2077         task_setup_data.callback_data = calldata;
2078         task = rpc_run_task(&task_setup_data);
2079         if (IS_ERR(task))
2080                 return PTR_ERR(task);
2081         status = 0;
2082         if (wait)
2083                 status = rpc_wait_for_completion_task(task);
2084         rpc_put_task(task);
2085         return status;
2086 out_free_calldata:
2087         kfree(calldata);
2088 out:
2089         if (roc)
2090                 pnfs_roc_release(state->inode);
2091         nfs4_put_open_state(state);
2092         nfs4_put_state_owner(sp);
2093         return status;
2094 }
2095
2096 static struct inode *
2097 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2098 {
2099         struct nfs4_state *state;
2100
2101         /* Protect against concurrent sillydeletes */
2102         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2103         if (IS_ERR(state))
2104                 return ERR_CAST(state);
2105         ctx->state = state;
2106         return igrab(state->inode);
2107 }
2108
2109 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2110 {
2111         if (ctx->state == NULL)
2112                 return;
2113         if (is_sync)
2114                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2115         else
2116                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2117 }
2118
2119 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2120 {
2121         struct nfs4_server_caps_arg args = {
2122                 .fhandle = fhandle,
2123         };
2124         struct nfs4_server_caps_res res = {};
2125         struct rpc_message msg = {
2126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2127                 .rpc_argp = &args,
2128                 .rpc_resp = &res,
2129         };
2130         int status;
2131
2132         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2133         if (status == 0) {
2134                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2135                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2136                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2137                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2138                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2139                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2140                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2141                         server->caps |= NFS_CAP_ACLS;
2142                 if (res.has_links != 0)
2143                         server->caps |= NFS_CAP_HARDLINKS;
2144                 if (res.has_symlinks != 0)
2145                         server->caps |= NFS_CAP_SYMLINKS;
2146                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2147                         server->caps |= NFS_CAP_FILEID;
2148                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2149                         server->caps |= NFS_CAP_MODE;
2150                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2151                         server->caps |= NFS_CAP_NLINK;
2152                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2153                         server->caps |= NFS_CAP_OWNER;
2154                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2155                         server->caps |= NFS_CAP_OWNER_GROUP;
2156                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2157                         server->caps |= NFS_CAP_ATIME;
2158                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2159                         server->caps |= NFS_CAP_CTIME;
2160                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2161                         server->caps |= NFS_CAP_MTIME;
2162
2163                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2164                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2165                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2166                 server->acl_bitmask = res.acl_bitmask;
2167         }
2168
2169         return status;
2170 }
2171
2172 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2173 {
2174         struct nfs4_exception exception = { };
2175         int err;
2176         do {
2177                 err = nfs4_handle_exception(server,
2178                                 _nfs4_server_capabilities(server, fhandle),
2179                                 &exception);
2180         } while (exception.retry);
2181         return err;
2182 }
2183
2184 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2185                 struct nfs_fsinfo *info)
2186 {
2187         struct nfs4_lookup_root_arg args = {
2188                 .bitmask = nfs4_fattr_bitmap,
2189         };
2190         struct nfs4_lookup_res res = {
2191                 .server = server,
2192                 .fattr = info->fattr,
2193                 .fh = fhandle,
2194         };
2195         struct rpc_message msg = {
2196                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2197                 .rpc_argp = &args,
2198                 .rpc_resp = &res,
2199         };
2200
2201         nfs_fattr_init(info->fattr);
2202         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2203 }
2204
2205 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2206                 struct nfs_fsinfo *info)
2207 {
2208         struct nfs4_exception exception = { };
2209         int err;
2210         do {
2211                 err = _nfs4_lookup_root(server, fhandle, info);
2212                 switch (err) {
2213                 case 0:
2214                 case -NFS4ERR_WRONGSEC:
2215                         break;
2216                 default:
2217                         err = nfs4_handle_exception(server, err, &exception);
2218                 }
2219         } while (exception.retry);
2220         return err;
2221 }
2222
2223 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2224                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2225 {
2226         struct rpc_auth *auth;
2227         int ret;
2228
2229         auth = rpcauth_create(flavor, server->client);
2230         if (!auth) {
2231                 ret = -EIO;
2232                 goto out;
2233         }
2234         ret = nfs4_lookup_root(server, fhandle, info);
2235 out:
2236         return ret;
2237 }
2238
2239 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2240                               struct nfs_fsinfo *info)
2241 {
2242         int i, len, status = 0;
2243         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2244
2245         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2246         flav_array[len] = RPC_AUTH_NULL;
2247         len += 1;
2248
2249         for (i = 0; i < len; i++) {
2250                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2251                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2252                         continue;
2253                 break;
2254         }
2255         /*
2256          * -EACCESS could mean that the user doesn't have correct permissions
2257          * to access the mount.  It could also mean that we tried to mount
2258          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2259          * existing mount programs don't handle -EACCES very well so it should
2260          * be mapped to -EPERM instead.
2261          */
2262         if (status == -EACCES)
2263                 status = -EPERM;
2264         return status;
2265 }
2266
2267 /*
2268  * get the file handle for the "/" directory on the server
2269  */
2270 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2271                               struct nfs_fsinfo *info)
2272 {
2273         int status = nfs4_lookup_root(server, fhandle, info);
2274         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2275                 /*
2276                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2277                  * by nfs4_map_errors() as this function exits.
2278                  */
2279                 status = nfs4_find_root_sec(server, fhandle, info);
2280         if (status == 0)
2281                 status = nfs4_server_capabilities(server, fhandle);
2282         if (status == 0)
2283                 status = nfs4_do_fsinfo(server, fhandle, info);
2284         return nfs4_map_errors(status);
2285 }
2286
2287 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2288 /*
2289  * Get locations and (maybe) other attributes of a referral.
2290  * Note that we'll actually follow the referral later when
2291  * we detect fsid mismatch in inode revalidation
2292  */
2293 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2294                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2295 {
2296         int status = -ENOMEM;
2297         struct page *page = NULL;
2298         struct nfs4_fs_locations *locations = NULL;
2299
2300         page = alloc_page(GFP_KERNEL);
2301         if (page == NULL)
2302                 goto out;
2303         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2304         if (locations == NULL)
2305                 goto out;
2306
2307         status = nfs4_proc_fs_locations(dir, name, locations, page);
2308         if (status != 0)
2309                 goto out;
2310         /* Make sure server returned a different fsid for the referral */
2311         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2312                 dprintk("%s: server did not return a different fsid for"
2313                         " a referral at %s\n", __func__, name->name);
2314                 status = -EIO;
2315                 goto out;
2316         }
2317         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2318         nfs_fixup_referral_attributes(&locations->fattr);
2319
2320         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2321         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2322         memset(fhandle, 0, sizeof(struct nfs_fh));
2323 out:
2324         if (page)
2325                 __free_page(page);
2326         kfree(locations);
2327         return status;
2328 }
2329
2330 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2331 {
2332         struct nfs4_getattr_arg args = {
2333                 .fh = fhandle,
2334                 .bitmask = server->attr_bitmask,
2335         };
2336         struct nfs4_getattr_res res = {
2337                 .fattr = fattr,
2338                 .server = server,
2339         };
2340         struct rpc_message msg = {
2341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2342                 .rpc_argp = &args,
2343                 .rpc_resp = &res,
2344         };
2345
2346         nfs_fattr_init(fattr);
2347         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2348 }
2349
2350 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2351 {
2352         struct nfs4_exception exception = { };
2353         int err;
2354         do {
2355                 err = nfs4_handle_exception(server,
2356                                 _nfs4_proc_getattr(server, fhandle, fattr),
2357                                 &exception);
2358         } while (exception.retry);
2359         return err;
2360 }
2361
2362 /*
2363  * The file is not closed if it is opened due to the a request to change
2364  * the size of the file. The open call will not be needed once the
2365  * VFS layer lookup-intents are implemented.
2366  *
2367  * Close is called when the inode is destroyed.
2368  * If we haven't opened the file for O_WRONLY, we
2369  * need to in the size_change case to obtain a stateid.
2370  *
2371  * Got race?
2372  * Because OPEN is always done by name in nfsv4, it is
2373  * possible that we opened a different file by the same
2374  * name.  We can recognize this race condition, but we
2375  * can't do anything about it besides returning an error.
2376  *
2377  * This will be fixed with VFS changes (lookup-intent).
2378  */
2379 static int
2380 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2381                   struct iattr *sattr)
2382 {
2383         struct inode *inode = dentry->d_inode;
2384         struct rpc_cred *cred = NULL;
2385         struct nfs4_state *state = NULL;
2386         int status;
2387
2388         if (pnfs_ld_layoutret_on_setattr(inode))
2389                 pnfs_return_layout(inode);
2390
2391         nfs_fattr_init(fattr);
2392
2393         /* Search for an existing open(O_WRITE) file */
2394         if (sattr->ia_valid & ATTR_FILE) {
2395                 struct nfs_open_context *ctx;
2396
2397                 ctx = nfs_file_open_context(sattr->ia_file);
2398                 if (ctx) {
2399                         cred = ctx->cred;
2400                         state = ctx->state;
2401                 }
2402         }
2403
2404         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2405         if (status == 0)
2406                 nfs_setattr_update_inode(inode, sattr);
2407         return status;
2408 }
2409
2410 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2411                 const struct nfs_fh *dirfh, const struct qstr *name,
2412                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2413 {
2414         int                    status;
2415         struct nfs4_lookup_arg args = {
2416                 .bitmask = server->attr_bitmask,
2417                 .dir_fh = dirfh,
2418                 .name = name,
2419         };
2420         struct nfs4_lookup_res res = {
2421                 .server = server,
2422                 .fattr = fattr,
2423                 .fh = fhandle,
2424         };
2425         struct rpc_message msg = {
2426                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2427                 .rpc_argp = &args,
2428                 .rpc_resp = &res,
2429         };
2430
2431         nfs_fattr_init(fattr);
2432
2433         dprintk("NFS call  lookupfh %s\n", name->name);
2434         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2435         dprintk("NFS reply lookupfh: %d\n", status);
2436         return status;
2437 }
2438
2439 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2440                               struct qstr *name, struct nfs_fh *fhandle,
2441                               struct nfs_fattr *fattr)
2442 {
2443         struct nfs4_exception exception = { };
2444         int err;
2445         do {
2446                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2447                 /* FIXME: !!!! */
2448                 if (err == -NFS4ERR_MOVED) {
2449                         err = -EREMOTE;
2450                         break;
2451                 }
2452                 err = nfs4_handle_exception(server, err, &exception);
2453         } while (exception.retry);
2454         return err;
2455 }
2456
2457 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2458                 const struct qstr *name, struct nfs_fh *fhandle,
2459                 struct nfs_fattr *fattr)
2460 {
2461         int status;
2462
2463         dprintk("NFS call  lookup %s\n", name->name);
2464         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2465         if (status == -NFS4ERR_MOVED)
2466                 status = nfs4_get_referral(dir, name, fattr, fhandle);
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                 err = nfs4_handle_exception(NFS_SERVER(dir),
2488                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2489                                 &exception);
2490                 if (err == -EPERM)
2491                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2492         } while (exception.retry);
2493         return err;
2494 }
2495
2496 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2497 {
2498         struct nfs_server *server = NFS_SERVER(inode);
2499         struct nfs4_accessargs args = {
2500                 .fh = NFS_FH(inode),
2501                 .bitmask = server->attr_bitmask,
2502         };
2503         struct nfs4_accessres res = {
2504                 .server = server,
2505         };
2506         struct rpc_message msg = {
2507                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2508                 .rpc_argp = &args,
2509                 .rpc_resp = &res,
2510                 .rpc_cred = entry->cred,
2511         };
2512         int mode = entry->mask;
2513         int status;
2514
2515         /*
2516          * Determine which access bits we want to ask for...
2517          */
2518         if (mode & MAY_READ)
2519                 args.access |= NFS4_ACCESS_READ;
2520         if (S_ISDIR(inode->i_mode)) {
2521                 if (mode & MAY_WRITE)
2522                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2523                 if (mode & MAY_EXEC)
2524                         args.access |= NFS4_ACCESS_LOOKUP;
2525         } else {
2526                 if (mode & MAY_WRITE)
2527                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2528                 if (mode & MAY_EXEC)
2529                         args.access |= NFS4_ACCESS_EXECUTE;
2530         }
2531
2532         res.fattr = nfs_alloc_fattr();
2533         if (res.fattr == NULL)
2534                 return -ENOMEM;
2535
2536         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2537         if (!status) {
2538                 entry->mask = 0;
2539                 if (res.access & NFS4_ACCESS_READ)
2540                         entry->mask |= MAY_READ;
2541                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2542                         entry->mask |= MAY_WRITE;
2543                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2544                         entry->mask |= MAY_EXEC;
2545                 nfs_refresh_inode(inode, res.fattr);
2546         }
2547         nfs_free_fattr(res.fattr);
2548         return status;
2549 }
2550
2551 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2552 {
2553         struct nfs4_exception exception = { };
2554         int err;
2555         do {
2556                 err = nfs4_handle_exception(NFS_SERVER(inode),
2557                                 _nfs4_proc_access(inode, entry),
2558                                 &exception);
2559         } while (exception.retry);
2560         return err;
2561 }
2562
2563 /*
2564  * TODO: For the time being, we don't try to get any attributes
2565  * along with any of the zero-copy operations READ, READDIR,
2566  * READLINK, WRITE.
2567  *
2568  * In the case of the first three, we want to put the GETATTR
2569  * after the read-type operation -- this is because it is hard
2570  * to predict the length of a GETATTR response in v4, and thus
2571  * align the READ data correctly.  This means that the GETATTR
2572  * may end up partially falling into the page cache, and we should
2573  * shift it into the 'tail' of the xdr_buf before processing.
2574  * To do this efficiently, we need to know the total length
2575  * of data received, which doesn't seem to be available outside
2576  * of the RPC layer.
2577  *
2578  * In the case of WRITE, we also want to put the GETATTR after
2579  * the operation -- in this case because we want to make sure
2580  * we get the post-operation mtime and size.  This means that
2581  * we can't use xdr_encode_pages() as written: we need a variant
2582  * of it which would leave room in the 'tail' iovec.
2583  *
2584  * Both of these changes to the XDR layer would in fact be quite
2585  * minor, but I decided to leave them for a subsequent patch.
2586  */
2587 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2588                 unsigned int pgbase, unsigned int pglen)
2589 {
2590         struct nfs4_readlink args = {
2591                 .fh       = NFS_FH(inode),
2592                 .pgbase   = pgbase,
2593                 .pglen    = pglen,
2594                 .pages    = &page,
2595         };
2596         struct nfs4_readlink_res res;
2597         struct rpc_message msg = {
2598                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2599                 .rpc_argp = &args,
2600                 .rpc_resp = &res,
2601         };
2602
2603         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2604 }
2605
2606 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2607                 unsigned int pgbase, unsigned int pglen)
2608 {
2609         struct nfs4_exception exception = { };
2610         int err;
2611         do {
2612                 err = nfs4_handle_exception(NFS_SERVER(inode),
2613                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2614                                 &exception);
2615         } while (exception.retry);
2616         return err;
2617 }
2618
2619 /*
2620  * Got race?
2621  * We will need to arrange for the VFS layer to provide an atomic open.
2622  * Until then, this create/open method is prone to inefficiency and race
2623  * conditions due to the lookup, create, and open VFS calls from sys_open()
2624  * placed on the wire.
2625  *
2626  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2627  * The file will be opened again in the subsequent VFS open call
2628  * (nfs4_proc_file_open).
2629  *
2630  * The open for read will just hang around to be used by any process that
2631  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2632  */
2633
2634 static int
2635 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2636                  int flags, struct nfs_open_context *ctx)
2637 {
2638         struct path my_path = {
2639                 .dentry = dentry,
2640         };
2641         struct path *path = &my_path;
2642         struct nfs4_state *state;
2643         struct rpc_cred *cred = NULL;
2644         fmode_t fmode = 0;
2645         int status = 0;
2646
2647         if (ctx != NULL) {
2648                 cred = ctx->cred;
2649                 path = &ctx->path;
2650                 fmode = ctx->mode;
2651         }
2652         sattr->ia_mode &= ~current_umask();
2653         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2654         d_drop(dentry);
2655         if (IS_ERR(state)) {
2656                 status = PTR_ERR(state);
2657                 goto out;
2658         }
2659         d_add(dentry, igrab(state->inode));
2660         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2661         if (ctx != NULL)
2662                 ctx->state = state;
2663         else
2664                 nfs4_close_sync(path, state, fmode);
2665 out:
2666         return status;
2667 }
2668
2669 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2670 {
2671         struct nfs_server *server = NFS_SERVER(dir);
2672         struct nfs_removeargs args = {
2673                 .fh = NFS_FH(dir),
2674                 .name.len = name->len,
2675                 .name.name = name->name,
2676                 .bitmask = server->attr_bitmask,
2677         };
2678         struct nfs_removeres res = {
2679                 .server = server,
2680         };
2681         struct rpc_message msg = {
2682                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2683                 .rpc_argp = &args,
2684                 .rpc_resp = &res,
2685         };
2686         int status = -ENOMEM;
2687
2688         res.dir_attr = nfs_alloc_fattr();
2689         if (res.dir_attr == NULL)
2690                 goto out;
2691
2692         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2693         if (status == 0) {
2694                 update_changeattr(dir, &res.cinfo);
2695                 nfs_post_op_update_inode(dir, res.dir_attr);
2696         }
2697         nfs_free_fattr(res.dir_attr);
2698 out:
2699         return status;
2700 }
2701
2702 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2703 {
2704         struct nfs4_exception exception = { };
2705         int err;
2706         do {
2707                 err = nfs4_handle_exception(NFS_SERVER(dir),
2708                                 _nfs4_proc_remove(dir, name),
2709                                 &exception);
2710         } while (exception.retry);
2711         return err;
2712 }
2713
2714 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2715 {
2716         struct nfs_server *server = NFS_SERVER(dir);
2717         struct nfs_removeargs *args = msg->rpc_argp;
2718         struct nfs_removeres *res = msg->rpc_resp;
2719
2720         args->bitmask = server->cache_consistency_bitmask;
2721         res->server = server;
2722         res->seq_res.sr_slot = NULL;
2723         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2724 }
2725
2726 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2727 {
2728         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2729
2730         if (!nfs4_sequence_done(task, &res->seq_res))
2731                 return 0;
2732         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2733                 return 0;
2734         update_changeattr(dir, &res->cinfo);
2735         nfs_post_op_update_inode(dir, res->dir_attr);
2736         return 1;
2737 }
2738
2739 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2740 {
2741         struct nfs_server *server = NFS_SERVER(dir);
2742         struct nfs_renameargs *arg = msg->rpc_argp;
2743         struct nfs_renameres *res = msg->rpc_resp;
2744
2745         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2746         arg->bitmask = server->attr_bitmask;
2747         res->server = server;
2748 }
2749
2750 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2751                                  struct inode *new_dir)
2752 {
2753         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2754
2755         if (!nfs4_sequence_done(task, &res->seq_res))
2756                 return 0;
2757         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2758                 return 0;
2759
2760         update_changeattr(old_dir, &res->old_cinfo);
2761         nfs_post_op_update_inode(old_dir, res->old_fattr);
2762         update_changeattr(new_dir, &res->new_cinfo);
2763         nfs_post_op_update_inode(new_dir, res->new_fattr);
2764         return 1;
2765 }
2766
2767 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2768                 struct inode *new_dir, struct qstr *new_name)
2769 {
2770         struct nfs_server *server = NFS_SERVER(old_dir);
2771         struct nfs_renameargs arg = {
2772                 .old_dir = NFS_FH(old_dir),
2773                 .new_dir = NFS_FH(new_dir),
2774                 .old_name = old_name,
2775                 .new_name = new_name,
2776                 .bitmask = server->attr_bitmask,
2777         };
2778         struct nfs_renameres res = {
2779                 .server = server,
2780         };
2781         struct rpc_message msg = {
2782                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2783                 .rpc_argp = &arg,
2784                 .rpc_resp = &res,
2785         };
2786         int status = -ENOMEM;
2787
2788         res.old_fattr = nfs_alloc_fattr();
2789         res.new_fattr = nfs_alloc_fattr();
2790         if (res.old_fattr == NULL || res.new_fattr == NULL)
2791                 goto out;
2792
2793         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2794         if (!status) {
2795                 update_changeattr(old_dir, &res.old_cinfo);
2796                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2797                 update_changeattr(new_dir, &res.new_cinfo);
2798                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2799         }
2800 out:
2801         nfs_free_fattr(res.new_fattr);
2802         nfs_free_fattr(res.old_fattr);
2803         return status;
2804 }
2805
2806 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2807                 struct inode *new_dir, struct qstr *new_name)
2808 {
2809         struct nfs4_exception exception = { };
2810         int err;
2811         do {
2812                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2813                                 _nfs4_proc_rename(old_dir, old_name,
2814                                         new_dir, new_name),
2815                                 &exception);
2816         } while (exception.retry);
2817         return err;
2818 }
2819
2820 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2821 {
2822         struct nfs_server *server = NFS_SERVER(inode);
2823         struct nfs4_link_arg arg = {
2824                 .fh     = NFS_FH(inode),
2825                 .dir_fh = NFS_FH(dir),
2826                 .name   = name,
2827                 .bitmask = server->attr_bitmask,
2828         };
2829         struct nfs4_link_res res = {
2830                 .server = server,
2831         };
2832         struct rpc_message msg = {
2833                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2834                 .rpc_argp = &arg,
2835                 .rpc_resp = &res,
2836         };
2837         int status = -ENOMEM;
2838
2839         res.fattr = nfs_alloc_fattr();
2840         res.dir_attr = nfs_alloc_fattr();
2841         if (res.fattr == NULL || res.dir_attr == NULL)
2842                 goto out;
2843
2844         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2845         if (!status) {
2846                 update_changeattr(dir, &res.cinfo);
2847                 nfs_post_op_update_inode(dir, res.dir_attr);
2848                 nfs_post_op_update_inode(inode, res.fattr);
2849         }
2850 out:
2851         nfs_free_fattr(res.dir_attr);
2852         nfs_free_fattr(res.fattr);
2853         return status;
2854 }
2855
2856 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2857 {
2858         struct nfs4_exception exception = { };
2859         int err;
2860         do {
2861                 err = nfs4_handle_exception(NFS_SERVER(inode),
2862                                 _nfs4_proc_link(inode, dir, name),
2863                                 &exception);
2864         } while (exception.retry);
2865         return err;
2866 }
2867
2868 struct nfs4_createdata {
2869         struct rpc_message msg;
2870         struct nfs4_create_arg arg;
2871         struct nfs4_create_res res;
2872         struct nfs_fh fh;
2873         struct nfs_fattr fattr;
2874         struct nfs_fattr dir_fattr;
2875 };
2876
2877 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2878                 struct qstr *name, struct iattr *sattr, u32 ftype)
2879 {
2880         struct nfs4_createdata *data;
2881
2882         data = kzalloc(sizeof(*data), GFP_KERNEL);
2883         if (data != NULL) {
2884                 struct nfs_server *server = NFS_SERVER(dir);
2885
2886                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2887                 data->msg.rpc_argp = &data->arg;
2888                 data->msg.rpc_resp = &data->res;
2889                 data->arg.dir_fh = NFS_FH(dir);
2890                 data->arg.server = server;
2891                 data->arg.name = name;
2892                 data->arg.attrs = sattr;
2893                 data->arg.ftype = ftype;
2894                 data->arg.bitmask = server->attr_bitmask;
2895                 data->res.server = server;
2896                 data->res.fh = &data->fh;
2897                 data->res.fattr = &data->fattr;
2898                 data->res.dir_fattr = &data->dir_fattr;
2899                 nfs_fattr_init(data->res.fattr);
2900                 nfs_fattr_init(data->res.dir_fattr);
2901         }
2902         return data;
2903 }
2904
2905 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2906 {
2907         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2908                                     &data->arg.seq_args, &data->res.seq_res, 1);
2909         if (status == 0) {
2910                 update_changeattr(dir, &data->res.dir_cinfo);
2911                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2912                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2913         }
2914         return status;
2915 }
2916
2917 static void nfs4_free_createdata(struct nfs4_createdata *data)
2918 {
2919         kfree(data);
2920 }
2921
2922 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2923                 struct page *page, unsigned int len, struct iattr *sattr)
2924 {
2925         struct nfs4_createdata *data;
2926         int status = -ENAMETOOLONG;
2927
2928         if (len > NFS4_MAXPATHLEN)
2929                 goto out;
2930
2931         status = -ENOMEM;
2932         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2933         if (data == NULL)
2934                 goto out;
2935
2936         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2937         data->arg.u.symlink.pages = &page;
2938         data->arg.u.symlink.len = len;
2939
2940         status = nfs4_do_create(dir, dentry, data);
2941
2942         nfs4_free_createdata(data);
2943 out:
2944         return status;
2945 }
2946
2947 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2948                 struct page *page, unsigned int len, struct iattr *sattr)
2949 {
2950         struct nfs4_exception exception = { };
2951         int err;
2952         do {
2953                 err = nfs4_handle_exception(NFS_SERVER(dir),
2954                                 _nfs4_proc_symlink(dir, dentry, page,
2955                                                         len, sattr),
2956                                 &exception);
2957         } while (exception.retry);
2958         return err;
2959 }
2960
2961 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2962                 struct iattr *sattr)
2963 {
2964         struct nfs4_createdata *data;
2965         int status = -ENOMEM;
2966
2967         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2968         if (data == NULL)
2969                 goto out;
2970
2971         status = nfs4_do_create(dir, dentry, data);
2972
2973         nfs4_free_createdata(data);
2974 out:
2975         return status;
2976 }
2977
2978 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2979                 struct iattr *sattr)
2980 {
2981         struct nfs4_exception exception = { };
2982         int err;
2983
2984         sattr->ia_mode &= ~current_umask();
2985         do {
2986                 err = nfs4_handle_exception(NFS_SERVER(dir),
2987                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2988                                 &exception);
2989         } while (exception.retry);
2990         return err;
2991 }
2992
2993 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2994                 u64 cookie, struct page **pages, unsigned int count, int plus)
2995 {
2996         struct inode            *dir = dentry->d_inode;
2997         struct nfs4_readdir_arg args = {
2998                 .fh = NFS_FH(dir),
2999                 .pages = pages,
3000                 .pgbase = 0,
3001                 .count = count,
3002                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3003                 .plus = plus,
3004         };
3005         struct nfs4_readdir_res res;
3006         struct rpc_message msg = {
3007                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3008                 .rpc_argp = &args,
3009                 .rpc_resp = &res,
3010                 .rpc_cred = cred,
3011         };
3012         int                     status;
3013
3014         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3015                         dentry->d_parent->d_name.name,
3016                         dentry->d_name.name,
3017                         (unsigned long long)cookie);
3018         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3019         res.pgbase = args.pgbase;
3020         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3021         if (status >= 0) {
3022                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3023                 status += args.pgbase;
3024         }
3025
3026         nfs_invalidate_atime(dir);
3027
3028         dprintk("%s: returns %d\n", __func__, status);
3029         return status;
3030 }
3031
3032 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3033                 u64 cookie, struct page **pages, unsigned int count, int plus)
3034 {
3035         struct nfs4_exception exception = { };
3036         int err;
3037         do {
3038                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3039                                 _nfs4_proc_readdir(dentry, cred, cookie,
3040                                         pages, count, plus),
3041                                 &exception);
3042         } while (exception.retry);
3043         return err;
3044 }
3045
3046 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3047                 struct iattr *sattr, dev_t rdev)
3048 {
3049         struct nfs4_createdata *data;
3050         int mode = sattr->ia_mode;
3051         int status = -ENOMEM;
3052
3053         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3054         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3055
3056         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3057         if (data == NULL)
3058                 goto out;
3059
3060         if (S_ISFIFO(mode))
3061                 data->arg.ftype = NF4FIFO;
3062         else if (S_ISBLK(mode)) {
3063                 data->arg.ftype = NF4BLK;
3064                 data->arg.u.device.specdata1 = MAJOR(rdev);
3065                 data->arg.u.device.specdata2 = MINOR(rdev);
3066         }
3067         else if (S_ISCHR(mode)) {
3068                 data->arg.ftype = NF4CHR;
3069                 data->arg.u.device.specdata1 = MAJOR(rdev);
3070                 data->arg.u.device.specdata2 = MINOR(rdev);
3071         }
3072
3073         status = nfs4_do_create(dir, dentry, data);
3074
3075         nfs4_free_createdata(data);
3076 out:
3077         return status;
3078 }
3079
3080 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3081                 struct iattr *sattr, dev_t rdev)
3082 {
3083         struct nfs4_exception exception = { };
3084         int err;
3085
3086         sattr->ia_mode &= ~current_umask();
3087         do {
3088                 err = nfs4_handle_exception(NFS_SERVER(dir),
3089                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3090                                 &exception);
3091         } while (exception.retry);
3092         return err;
3093 }
3094
3095 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3096                  struct nfs_fsstat *fsstat)
3097 {
3098         struct nfs4_statfs_arg args = {
3099                 .fh = fhandle,
3100                 .bitmask = server->attr_bitmask,
3101         };
3102         struct nfs4_statfs_res res = {
3103                 .fsstat = fsstat,
3104         };
3105         struct rpc_message msg = {
3106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3107                 .rpc_argp = &args,
3108                 .rpc_resp = &res,
3109         };
3110
3111         nfs_fattr_init(fsstat->fattr);
3112         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3113 }
3114
3115 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3116 {
3117         struct nfs4_exception exception = { };
3118         int err;
3119         do {
3120                 err = nfs4_handle_exception(server,
3121                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3122                                 &exception);
3123         } while (exception.retry);
3124         return err;
3125 }
3126
3127 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3128                 struct nfs_fsinfo *fsinfo)
3129 {
3130         struct nfs4_fsinfo_arg args = {
3131                 .fh = fhandle,
3132                 .bitmask = server->attr_bitmask,
3133         };
3134         struct nfs4_fsinfo_res res = {
3135                 .fsinfo = fsinfo,
3136         };
3137         struct rpc_message msg = {
3138                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3139                 .rpc_argp = &args,
3140                 .rpc_resp = &res,
3141         };
3142
3143         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3144 }
3145
3146 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3147 {
3148         struct nfs4_exception exception = { };
3149         int err;
3150
3151         do {
3152                 err = nfs4_handle_exception(server,
3153                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3154                                 &exception);
3155         } while (exception.retry);
3156         return err;
3157 }
3158
3159 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3160 {
3161         nfs_fattr_init(fsinfo->fattr);
3162         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3163 }
3164
3165 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3166                 struct nfs_pathconf *pathconf)
3167 {
3168         struct nfs4_pathconf_arg args = {
3169                 .fh = fhandle,
3170                 .bitmask = server->attr_bitmask,
3171         };
3172         struct nfs4_pathconf_res res = {
3173                 .pathconf = pathconf,
3174         };
3175         struct rpc_message msg = {
3176                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3177                 .rpc_argp = &args,
3178                 .rpc_resp = &res,
3179         };
3180
3181         /* None of the pathconf attributes are mandatory to implement */
3182         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3183                 memset(pathconf, 0, sizeof(*pathconf));
3184                 return 0;
3185         }
3186
3187         nfs_fattr_init(pathconf->fattr);
3188         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3189 }
3190
3191 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3192                 struct nfs_pathconf *pathconf)
3193 {
3194         struct nfs4_exception exception = { };
3195         int err;
3196
3197         do {
3198                 err = nfs4_handle_exception(server,
3199                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3200                                 &exception);
3201         } while (exception.retry);
3202         return err;
3203 }
3204
3205 void __nfs4_read_done_cb(struct nfs_read_data *data)
3206 {
3207         nfs_invalidate_atime(data->inode);
3208 }
3209
3210 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3211 {
3212         struct nfs_server *server = NFS_SERVER(data->inode);
3213
3214         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3215                 nfs_restart_rpc(task, server->nfs_client);
3216                 return -EAGAIN;
3217         }
3218
3219         __nfs4_read_done_cb(data);
3220         if (task->tk_status > 0)
3221                 renew_lease(server, data->timestamp);
3222         return 0;
3223 }
3224
3225 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3226 {
3227
3228         dprintk("--> %s\n", __func__);
3229
3230         if (!nfs4_sequence_done(task, &data->res.seq_res))
3231                 return -EAGAIN;
3232
3233         return data->read_done_cb ? data->read_done_cb(task, data) :
3234                                     nfs4_read_done_cb(task, data);
3235 }
3236
3237 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3238 {
3239         data->timestamp   = jiffies;
3240         data->read_done_cb = nfs4_read_done_cb;
3241         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3242 }
3243
3244 /* Reset the the nfs_read_data to send the read to the MDS. */
3245 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3246 {
3247         dprintk("%s Reset task for i/o through\n", __func__);
3248         put_lseg(data->lseg);
3249         data->lseg = NULL;
3250         /* offsets will differ in the dense stripe case */
3251         data->args.offset = data->mds_offset;
3252         data->ds_clp = NULL;
3253         data->args.fh     = NFS_FH(data->inode);
3254         data->read_done_cb = nfs4_read_done_cb;
3255         task->tk_ops = data->mds_ops;
3256         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3257 }
3258 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3259
3260 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3261 {
3262         struct inode *inode = data->inode;
3263
3264         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3265                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3266                 return -EAGAIN;
3267         }
3268         if (task->tk_status >= 0) {
3269                 renew_lease(NFS_SERVER(inode), data->timestamp);
3270                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3271         }
3272         return 0;
3273 }
3274
3275 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3276 {
3277         if (!nfs4_sequence_done(task, &data->res.seq_res))
3278                 return -EAGAIN;
3279         return data->write_done_cb ? data->write_done_cb(task, data) :
3280                 nfs4_write_done_cb(task, data);
3281 }
3282
3283 /* Reset the the nfs_write_data to send the write to the MDS. */
3284 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3285 {
3286         dprintk("%s Reset task for i/o through\n", __func__);
3287         put_lseg(data->lseg);
3288         data->lseg          = NULL;
3289         data->ds_clp        = NULL;
3290         data->write_done_cb = nfs4_write_done_cb;
3291         data->args.fh       = NFS_FH(data->inode);
3292         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3293         data->args.offset   = data->mds_offset;
3294         data->res.fattr     = &data->fattr;
3295         task->tk_ops        = data->mds_ops;
3296         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3297 }
3298 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3299
3300 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3301 {
3302         struct nfs_server *server = NFS_SERVER(data->inode);
3303
3304         if (data->lseg) {
3305                 data->args.bitmask = NULL;
3306                 data->res.fattr = NULL;
3307         } else
3308                 data->args.bitmask = server->cache_consistency_bitmask;
3309         if (!data->write_done_cb)
3310                 data->write_done_cb = nfs4_write_done_cb;
3311         data->res.server = server;
3312         data->timestamp   = jiffies;
3313
3314         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3315 }
3316
3317 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3318 {
3319         struct inode *inode = data->inode;
3320
3321         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3322                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3323                 return -EAGAIN;
3324         }
3325         nfs_refresh_inode(inode, data->res.fattr);
3326         return 0;
3327 }
3328
3329 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3330 {
3331         if (!nfs4_sequence_done(task, &data->res.seq_res))
3332                 return -EAGAIN;
3333         return data->write_done_cb(task, data);
3334 }
3335
3336 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3337 {
3338         struct nfs_server *server = NFS_SERVER(data->inode);
3339
3340         if (data->lseg) {
3341                 data->args.bitmask = NULL;
3342                 data->res.fattr = NULL;
3343         } else
3344                 data->args.bitmask = server->cache_consistency_bitmask;
3345         if (!data->write_done_cb)
3346                 data->write_done_cb = nfs4_commit_done_cb;
3347         data->res.server = server;
3348         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3349 }
3350
3351 struct nfs4_renewdata {
3352         struct nfs_client       *client;
3353         unsigned long           timestamp;
3354 };
3355
3356 /*
3357  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3358  * standalone procedure for queueing an asynchronous RENEW.
3359  */
3360 static void nfs4_renew_release(void *calldata)
3361 {
3362         struct nfs4_renewdata *data = calldata;
3363         struct nfs_client *clp = data->client;
3364
3365         if (atomic_read(&clp->cl_count) > 1)
3366                 nfs4_schedule_state_renewal(clp);
3367         nfs_put_client(clp);
3368         kfree(data);
3369 }
3370
3371 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3372 {
3373         struct nfs4_renewdata *data = calldata;
3374         struct nfs_client *clp = data->client;
3375         unsigned long timestamp = data->timestamp;
3376
3377         if (task->tk_status < 0) {
3378                 /* Unless we're shutting down, schedule state recovery! */
3379                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3380                         nfs4_schedule_lease_recovery(clp);
3381                 return;
3382         }
3383         do_renew_lease(clp, timestamp);
3384 }
3385
3386 static const struct rpc_call_ops nfs4_renew_ops = {
3387         .rpc_call_done = nfs4_renew_done,
3388         .rpc_release = nfs4_renew_release,
3389 };
3390
3391 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3392 {
3393         struct rpc_message msg = {
3394                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3395                 .rpc_argp       = clp,
3396                 .rpc_cred       = cred,
3397         };
3398         struct nfs4_renewdata *data;
3399
3400         if (!atomic_inc_not_zero(&clp->cl_count))
3401                 return -EIO;
3402         data = kmalloc(sizeof(*data), GFP_KERNEL);
3403         if (data == NULL)
3404                 return -ENOMEM;
3405         data->client = clp;
3406         data->timestamp = jiffies;
3407         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3408                         &nfs4_renew_ops, data);
3409 }
3410
3411 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3412 {
3413         struct rpc_message msg = {
3414                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3415                 .rpc_argp       = clp,
3416                 .rpc_cred       = cred,
3417         };
3418         unsigned long now = jiffies;
3419         int status;
3420
3421         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3422         if (status < 0)
3423                 return status;
3424         do_renew_lease(clp, now);
3425         return 0;
3426 }
3427
3428 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3429 {
3430         return (server->caps & NFS_CAP_ACLS)
3431                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3432                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3433 }
3434
3435 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3436  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3437  * the stack.
3438  */
3439 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3440
3441 static void buf_to_pages(const void *buf, size_t buflen,
3442                 struct page **pages, unsigned int *pgbase)
3443 {
3444         const void *p = buf;
3445
3446         *pgbase = offset_in_page(buf);
3447         p -= *pgbase;
3448         while (p < buf + buflen) {
3449                 *(pages++) = virt_to_page(p);
3450                 p += PAGE_CACHE_SIZE;
3451         }
3452 }
3453
3454 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3455                 struct page **pages, unsigned int *pgbase)
3456 {
3457         struct page *newpage, **spages;
3458         int rc = 0;
3459         size_t len;
3460         spages = pages;
3461
3462         do {
3463                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3464                 newpage = alloc_page(GFP_KERNEL);
3465
3466                 if (newpage == NULL)
3467                         goto unwind;
3468                 memcpy(page_address(newpage), buf, len);
3469                 buf += len;
3470                 buflen -= len;
3471                 *pages++ = newpage;
3472                 rc++;
3473         } while (buflen != 0);
3474
3475         return rc;
3476
3477 unwind:
3478         for(; rc > 0; rc--)
3479                 __free_page(spages[rc-1]);
3480         return -ENOMEM;
3481 }
3482
3483 struct nfs4_cached_acl {
3484         int cached;
3485         size_t len;
3486         char data[0];
3487 };
3488
3489 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3490 {
3491         struct nfs_inode *nfsi = NFS_I(inode);
3492
3493         spin_lock(&inode->i_lock);
3494         kfree(nfsi->nfs4_acl);
3495         nfsi->nfs4_acl = acl;
3496         spin_unlock(&inode->i_lock);
3497 }
3498
3499 static void nfs4_zap_acl_attr(struct inode *inode)
3500 {
3501         nfs4_set_cached_acl(inode, NULL);
3502 }
3503
3504 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3505 {
3506         struct nfs_inode *nfsi = NFS_I(inode);
3507         struct nfs4_cached_acl *acl;
3508         int ret = -ENOENT;
3509
3510         spin_lock(&inode->i_lock);
3511         acl = nfsi->nfs4_acl;
3512         if (acl == NULL)
3513                 goto out;
3514         if (buf == NULL) /* user is just asking for length */
3515                 goto out_len;
3516         if (acl->cached == 0)
3517                 goto out;
3518         ret = -ERANGE; /* see getxattr(2) man page */
3519         if (acl->len > buflen)
3520                 goto out;
3521         memcpy(buf, acl->data, acl->len);
3522 out_len:
3523         ret = acl->len;
3524 out:
3525         spin_unlock(&inode->i_lock);
3526         return ret;
3527 }
3528
3529 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3530 {
3531         struct nfs4_cached_acl *acl;
3532
3533         if (buf && acl_len <= PAGE_SIZE) {
3534                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3535                 if (acl == NULL)
3536                         goto out;
3537                 acl->cached = 1;
3538                 memcpy(acl->data, buf, acl_len);
3539         } else {
3540                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3541                 if (acl == NULL)
3542                         goto out;
3543                 acl->cached = 0;
3544         }
3545         acl->len = acl_len;
3546 out:
3547         nfs4_set_cached_acl(inode, acl);
3548 }
3549
3550 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3551 {
3552         struct page *pages[NFS4ACL_MAXPAGES];
3553         struct nfs_getaclargs args = {
3554                 .fh = NFS_FH(inode),
3555                 .acl_pages = pages,
3556                 .acl_len = buflen,
3557         };
3558         struct nfs_getaclres res = {
3559                 .acl_len = buflen,
3560         };
3561         void *resp_buf;
3562         struct rpc_message msg = {
3563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3564                 .rpc_argp = &args,
3565                 .rpc_resp = &res,
3566         };
3567         struct page *localpage = NULL;
3568         int ret;
3569
3570         if (buflen < PAGE_SIZE) {
3571                 /* As long as we're doing a round trip to the server anyway,
3572                  * let's be prepared for a page of acl data. */
3573                 localpage = alloc_page(GFP_KERNEL);
3574                 resp_buf = page_address(localpage);
3575                 if (localpage == NULL)
3576                         return -ENOMEM;
3577                 args.acl_pages[0] = localpage;
3578                 args.acl_pgbase = 0;
3579                 args.acl_len = PAGE_SIZE;
3580         } else {
3581                 resp_buf = buf;
3582                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3583         }
3584         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3585         if (ret)
3586                 goto out_free;
3587         if (res.acl_len > args.acl_len)
3588                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3589         else
3590                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3591         if (buf) {
3592                 ret = -ERANGE;
3593                 if (res.acl_len > buflen)
3594                         goto out_free;
3595                 if (localpage)
3596                         memcpy(buf, resp_buf, res.acl_len);
3597         }
3598         ret = res.acl_len;
3599 out_free:
3600         if (localpage)
3601                 __free_page(localpage);
3602         return ret;
3603 }
3604
3605 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3606 {
3607         struct nfs4_exception exception = { };
3608         ssize_t ret;
3609         do {
3610                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3611                 if (ret >= 0)
3612                         break;
3613                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3614         } while (exception.retry);
3615         return ret;
3616 }
3617
3618 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3619 {
3620         struct nfs_server *server = NFS_SERVER(inode);
3621         int ret;
3622
3623         if (!nfs4_server_supports_acls(server))
3624                 return -EOPNOTSUPP;
3625         ret = nfs_revalidate_inode(server, inode);
3626         if (ret < 0)
3627                 return ret;
3628         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3629                 nfs_zap_acl_cache(inode);
3630         ret = nfs4_read_cached_acl(inode, buf, buflen);
3631         if (ret != -ENOENT)
3632                 return ret;
3633         return nfs4_get_acl_uncached(inode, buf, buflen);
3634 }
3635
3636 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3637 {
3638         struct nfs_server *server = NFS_SERVER(inode);
3639         struct page *pages[NFS4ACL_MAXPAGES];
3640         struct nfs_setaclargs arg = {
3641                 .fh             = NFS_FH(inode),
3642                 .acl_pages      = pages,
3643                 .acl_len        = buflen,
3644         };
3645         struct nfs_setaclres res;
3646         struct rpc_message msg = {
3647                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3648                 .rpc_argp       = &arg,
3649                 .rpc_resp       = &res,
3650         };
3651         int ret, i;
3652
3653         if (!nfs4_server_supports_acls(server))
3654                 return -EOPNOTSUPP;
3655         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3656         if (i < 0)
3657                 return i;
3658         nfs_inode_return_delegation(inode);
3659         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3660
3661         /*
3662          * Free each page after tx, so the only ref left is
3663          * held by the network stack
3664          */
3665         for (; i > 0; i--)
3666                 put_page(pages[i-1]);
3667
3668         /*
3669          * Acl update can result in inode attribute update.
3670          * so mark the attribute cache invalid.
3671          */
3672         spin_lock(&inode->i_lock);
3673         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3674         spin_unlock(&inode->i_lock);
3675         nfs_access_zap_cache(inode);
3676         nfs_zap_acl_cache(inode);
3677         return ret;
3678 }
3679
3680 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3681 {
3682         struct nfs4_exception exception = { };
3683         int err;
3684         do {
3685                 err = nfs4_handle_exception(NFS_SERVER(inode),
3686                                 __nfs4_proc_set_acl(inode, buf, buflen),
3687                                 &exception);
3688         } while (exception.retry);
3689         return err;
3690 }
3691
3692 static int
3693 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3694 {
3695         struct nfs_client *clp = server->nfs_client;
3696
3697         if (task->tk_status >= 0)
3698                 return 0;
3699         switch(task->tk_status) {
3700                 case -NFS4ERR_DELEG_REVOKED:
3701                 case -NFS4ERR_ADMIN_REVOKED:
3702                 case -NFS4ERR_BAD_STATEID:
3703                         if (state != NULL)
3704                                 nfs_remove_bad_delegation(state->inode);
3705                 case -NFS4ERR_OPENMODE:
3706                         if (state == NULL)
3707                                 break;
3708                         nfs4_schedule_stateid_recovery(server, state);
3709                         goto wait_on_recovery;
3710                 case -NFS4ERR_EXPIRED:
3711                         if (state != NULL)
3712                                 nfs4_schedule_stateid_recovery(server, state);
3713                 case -NFS4ERR_STALE_STATEID:
3714                 case -NFS4ERR_STALE_CLIENTID:
3715                         nfs4_schedule_lease_recovery(clp);
3716                         goto wait_on_recovery;
3717 #if defined(CONFIG_NFS_V4_1)
3718                 case -NFS4ERR_BADSESSION:
3719                 case -NFS4ERR_BADSLOT:
3720                 case -NFS4ERR_BAD_HIGH_SLOT:
3721                 case -NFS4ERR_DEADSESSION:
3722                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3723                 case -NFS4ERR_SEQ_FALSE_RETRY:
3724                 case -NFS4ERR_SEQ_MISORDERED:
3725                         dprintk("%s ERROR %d, Reset session\n", __func__,
3726                                 task->tk_status);
3727                         nfs4_schedule_session_recovery(clp->cl_session);
3728                         task->tk_status = 0;
3729                         return -EAGAIN;
3730 #endif /* CONFIG_NFS_V4_1 */
3731                 case -NFS4ERR_DELAY:
3732                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3733                 case -NFS4ERR_GRACE:
3734                 case -EKEYEXPIRED:
3735                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3736                         task->tk_status = 0;
3737                         return -EAGAIN;
3738                 case -NFS4ERR_RETRY_UNCACHED_REP:
3739                 case -NFS4ERR_OLD_STATEID:
3740                         task->tk_status = 0;
3741                         return -EAGAIN;
3742         }
3743         task->tk_status = nfs4_map_errors(task->tk_status);
3744         return 0;
3745 wait_on_recovery:
3746         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3747         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3748                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3749         task->tk_status = 0;
3750         return -EAGAIN;
3751 }
3752
3753 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3754                 unsigned short port, struct rpc_cred *cred,
3755                 struct nfs4_setclientid_res *res)
3756 {
3757         nfs4_verifier sc_verifier;
3758         struct nfs4_setclientid setclientid = {
3759                 .sc_verifier = &sc_verifier,
3760                 .sc_prog = program,
3761                 .sc_cb_ident = clp->cl_cb_ident,
3762         };
3763         struct rpc_message msg = {
3764                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3765                 .rpc_argp = &setclientid,
3766                 .rpc_resp = res,
3767                 .rpc_cred = cred,
3768         };
3769         __be32 *p;
3770         int loop = 0;
3771         int status;
3772
3773         p = (__be32*)sc_verifier.data;
3774         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3775         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3776
3777         for(;;) {
3778                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3779                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3780                                 clp->cl_ipaddr,
3781                                 rpc_peeraddr2str(clp->cl_rpcclient,
3782                                                         RPC_DISPLAY_ADDR),
3783                                 rpc_peeraddr2str(clp->cl_rpcclient,
3784                                                         RPC_DISPLAY_PROTO),
3785                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3786                                 clp->cl_id_uniquifier);
3787                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3788                                 sizeof(setclientid.sc_netid),
3789                                 rpc_peeraddr2str(clp->cl_rpcclient,
3790                                                         RPC_DISPLAY_NETID));
3791                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3792                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3793                                 clp->cl_ipaddr, port >> 8, port & 255);
3794
3795                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3796                 if (status != -NFS4ERR_CLID_INUSE)
3797                         break;
3798                 if (loop != 0) {
3799                         ++clp->cl_id_uniquifier;
3800                         break;
3801                 }
3802                 ++loop;
3803                 ssleep(clp->cl_lease_time / HZ + 1);
3804         }
3805         return status;
3806 }
3807
3808 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3809                 struct nfs4_setclientid_res *arg,
3810                 struct rpc_cred *cred)
3811 {
3812         struct nfs_fsinfo fsinfo;
3813         struct rpc_message msg = {
3814                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3815                 .rpc_argp = arg,
3816                 .rpc_resp = &fsinfo,
3817                 .rpc_cred = cred,
3818         };
3819         unsigned long now;
3820         int status;
3821
3822         now = jiffies;
3823         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3824         if (status == 0) {
3825                 spin_lock(&clp->cl_lock);
3826                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3827                 clp->cl_last_renewal = now;
3828                 spin_unlock(&clp->cl_lock);
3829         }
3830         return status;
3831 }
3832
3833 struct nfs4_delegreturndata {
3834         struct nfs4_delegreturnargs args;
3835         struct nfs4_delegreturnres res;
3836         struct nfs_fh fh;
3837         nfs4_stateid stateid;
3838         unsigned long timestamp;
3839         struct nfs_fattr fattr;
3840         int rpc_status;
3841 };
3842
3843 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3844 {
3845         struct nfs4_delegreturndata *data = calldata;
3846
3847         if (!nfs4_sequence_done(task, &data->res.seq_res))
3848                 return;
3849
3850         switch (task->tk_status) {
3851         case -NFS4ERR_STALE_STATEID:
3852         case -NFS4ERR_EXPIRED:
3853         case 0:
3854                 renew_lease(data->res.server, data->timestamp);
3855                 break;
3856         default:
3857                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3858                                 -EAGAIN) {
3859                         nfs_restart_rpc(task, data->res.server->nfs_client);
3860                         return;
3861                 }
3862         }
3863         data->rpc_status = task->tk_status;
3864 }
3865
3866 static void nfs4_delegreturn_release(void *calldata)
3867 {
3868         kfree(calldata);
3869 }
3870
3871 #if defined(CONFIG_NFS_V4_1)
3872 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3873 {
3874         struct nfs4_delegreturndata *d_data;
3875
3876         d_data = (struct nfs4_delegreturndata *)data;
3877
3878         if (nfs4_setup_sequence(d_data->res.server,
3879                                 &d_data->args.seq_args,
3880                                 &d_data->res.seq_res, 1, task))
3881                 return;
3882         rpc_call_start(task);
3883 }
3884 #endif /* CONFIG_NFS_V4_1 */
3885
3886 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3887 #if defined(CONFIG_NFS_V4_1)
3888         .rpc_call_prepare = nfs4_delegreturn_prepare,
3889 #endif /* CONFIG_NFS_V4_1 */
3890         .rpc_call_done = nfs4_delegreturn_done,
3891         .rpc_release = nfs4_delegreturn_release,
3892 };
3893
3894 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3895 {
3896         struct nfs4_delegreturndata *data;
3897         struct nfs_server *server = NFS_SERVER(inode);
3898         struct rpc_task *task;
3899         struct rpc_message msg = {
3900                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3901                 .rpc_cred = cred,
3902         };
3903         struct rpc_task_setup task_setup_data = {
3904                 .rpc_client = server->client,
3905                 .rpc_message = &msg,
3906                 .callback_ops = &nfs4_delegreturn_ops,
3907                 .flags = RPC_TASK_ASYNC,
3908         };
3909         int status = 0;
3910
3911         data = kzalloc(sizeof(*data), GFP_NOFS);
3912         if (data == NULL)
3913                 return -ENOMEM;
3914         data->args.fhandle = &data->fh;
3915         data->args.stateid = &data->stateid;
3916         data->args.bitmask = server->attr_bitmask;
3917         nfs_copy_fh(&data->fh, NFS_FH(inode));
3918         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3919         data->res.fattr = &data->fattr;
3920         data->res.server = server;
3921         nfs_fattr_init(data->res.fattr);
3922         data->timestamp = jiffies;
3923         data->rpc_status = 0;
3924
3925         task_setup_data.callback_data = data;
3926         msg.rpc_argp = &data->args;
3927         msg.rpc_resp = &data->res;
3928         task = rpc_run_task(&task_setup_data);
3929         if (IS_ERR(task))
3930                 return PTR_ERR(task);
3931         if (!issync)
3932                 goto out;
3933         status = nfs4_wait_for_completion_rpc_task(task);
3934         if (status != 0)
3935                 goto out;
3936         status = data->rpc_status;
3937         if (status != 0)
3938                 goto out;
3939         nfs_refresh_inode(inode, &data->fattr);
3940 out:
3941         rpc_put_task(task);
3942         return status;
3943 }
3944
3945 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3946 {
3947         struct nfs_server *server = NFS_SERVER(inode);
3948         struct nfs4_exception exception = { };
3949         int err;
3950         do {
3951                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3952                 switch (err) {
3953                         case -NFS4ERR_STALE_STATEID:
3954                         case -NFS4ERR_EXPIRED:
3955                         case 0:
3956                                 return 0;
3957                 }
3958                 err = nfs4_handle_exception(server, err, &exception);
3959         } while (exception.retry);
3960         return err;
3961 }
3962
3963 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3964 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3965
3966 /*
3967  * sleep, with exponential backoff, and retry the LOCK operation.
3968  */
3969 static unsigned long
3970 nfs4_set_lock_task_retry(unsigned long timeout)
3971 {
3972         schedule_timeout_killable(timeout);
3973         timeout <<= 1;
3974         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3975                 return NFS4_LOCK_MAXTIMEOUT;
3976         return timeout;
3977 }
3978
3979 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3980 {
3981         struct inode *inode = state->inode;
3982         struct nfs_server *server = NFS_SERVER(inode);
3983         struct nfs_client *clp = server->nfs_client;
3984         struct nfs_lockt_args arg = {
3985                 .fh = NFS_FH(inode),
3986                 .fl = request,
3987         };
3988         struct nfs_lockt_res res = {
3989                 .denied = request,
3990         };
3991         struct rpc_message msg = {
3992                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3993                 .rpc_argp       = &arg,
3994                 .rpc_resp       = &res,
3995                 .rpc_cred       = state->owner->so_cred,
3996         };
3997         struct nfs4_lock_state *lsp;
3998         int status;
3999
4000         arg.lock_owner.clientid = clp->cl_clientid;
4001         status = nfs4_set_lock_state(state, request);
4002         if (status != 0)
4003                 goto out;
4004         lsp = request->fl_u.nfs4_fl.owner;
4005         arg.lock_owner.id = lsp->ls_id.id;
4006         arg.lock_owner.s_dev = server->s_dev;
4007         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4008         switch (status) {
4009                 case 0:
4010                         request->fl_type = F_UNLCK;
4011                         break;
4012                 case -NFS4ERR_DENIED:
4013                         status = 0;
4014         }
4015         request->fl_ops->fl_release_private(request);
4016 out:
4017         return status;
4018 }
4019
4020 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4021 {
4022         struct nfs4_exception exception = { };
4023         int err;
4024
4025         do {
4026                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4027                                 _nfs4_proc_getlk(state, cmd, request),
4028                                 &exception);
4029         } while (exception.retry);
4030         return err;
4031 }
4032
4033 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4034 {
4035         int res = 0;
4036         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4037                 case FL_POSIX:
4038                         res = posix_lock_file_wait(file, fl);
4039                         break;
4040                 case FL_FLOCK:
4041                         res = flock_lock_file_wait(file, fl);
4042                         break;
4043                 default:
4044                         BUG();
4045         }
4046         return res;
4047 }
4048
4049 struct nfs4_unlockdata {
4050         struct nfs_locku_args arg;
4051         struct nfs_locku_res res;
4052         struct nfs4_lock_state *lsp;
4053         struct nfs_open_context *ctx;
4054         struct file_lock fl;
4055         const struct nfs_server *server;
4056         unsigned long timestamp;
4057 };
4058
4059 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4060                 struct nfs_open_context *ctx,
4061                 struct nfs4_lock_state *lsp,
4062                 struct nfs_seqid *seqid)
4063 {
4064         struct nfs4_unlockdata *p;
4065         struct inode *inode = lsp->ls_state->inode;
4066
4067         p = kzalloc(sizeof(*p), GFP_NOFS);
4068         if (p == NULL)
4069                 return NULL;
4070         p->arg.fh = NFS_FH(inode);
4071         p->arg.fl = &p->fl;
4072         p->arg.seqid = seqid;
4073         p->res.seqid = seqid;
4074         p->arg.stateid = &lsp->ls_stateid;
4075         p->lsp = lsp;
4076         atomic_inc(&lsp->ls_count);
4077         /* Ensure we don't close file until we're done freeing locks! */
4078         p->ctx = get_nfs_open_context(ctx);
4079         memcpy(&p->fl, fl, sizeof(p->fl));
4080         p->server = NFS_SERVER(inode);
4081         return p;
4082 }
4083
4084 static void nfs4_locku_release_calldata(void *data)
4085 {
4086         struct nfs4_unlockdata *calldata = data;
4087         nfs_free_seqid(calldata->arg.seqid);
4088         nfs4_put_lock_state(calldata->lsp);
4089         put_nfs_open_context(calldata->ctx);
4090         kfree(calldata);
4091 }
4092
4093 static void nfs4_locku_done(struct rpc_task *task, void *data)
4094 {
4095         struct nfs4_unlockdata *calldata = data;
4096
4097         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4098                 return;
4099         switch (task->tk_status) {
4100                 case 0:
4101                         memcpy(calldata->lsp->ls_stateid.data,
4102                                         calldata->res.stateid.data,
4103                                         sizeof(calldata->lsp->ls_stateid.data));
4104                         renew_lease(calldata->server, calldata->timestamp);
4105                         break;
4106                 case -NFS4ERR_BAD_STATEID:
4107                 case -NFS4ERR_OLD_STATEID:
4108                 case -NFS4ERR_STALE_STATEID:
4109                 case -NFS4ERR_EXPIRED:
4110                         break;
4111                 default:
4112                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4113                                 nfs_restart_rpc(task,
4114                                                  calldata->server->nfs_client);
4115         }
4116 }
4117
4118 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4119 {
4120         struct nfs4_unlockdata *calldata = data;
4121
4122         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4123                 return;
4124         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4125                 /* Note: exit _without_ running nfs4_locku_done */
4126                 task->tk_action = NULL;
4127                 return;
4128         }
4129         calldata->timestamp = jiffies;
4130         if (nfs4_setup_sequence(calldata->server,
4131                                 &calldata->arg.seq_args,
4132                                 &calldata->res.seq_res, 1, task))
4133                 return;
4134         rpc_call_start(task);
4135 }
4136
4137 static const struct rpc_call_ops nfs4_locku_ops = {
4138         .rpc_call_prepare = nfs4_locku_prepare,
4139         .rpc_call_done = nfs4_locku_done,
4140         .rpc_release = nfs4_locku_release_calldata,
4141 };
4142
4143 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4144                 struct nfs_open_context *ctx,
4145                 struct nfs4_lock_state *lsp,
4146                 struct nfs_seqid *seqid)
4147 {
4148         struct nfs4_unlockdata *data;
4149         struct rpc_message msg = {
4150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4151                 .rpc_cred = ctx->cred,
4152         };
4153         struct rpc_task_setup task_setup_data = {
4154                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4155                 .rpc_message = &msg,
4156                 .callback_ops = &nfs4_locku_ops,
4157                 .workqueue = nfsiod_workqueue,
4158                 .flags = RPC_TASK_ASYNC,
4159         };
4160
4161         /* Ensure this is an unlock - when canceling a lock, the
4162          * canceled lock is passed in, and it won't be an unlock.
4163          */
4164         fl->fl_type = F_UNLCK;
4165
4166         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4167         if (data == NULL) {
4168                 nfs_free_seqid(seqid);
4169                 return ERR_PTR(-ENOMEM);
4170         }
4171
4172         msg.rpc_argp = &data->arg;
4173         msg.rpc_resp = &data->res;
4174         task_setup_data.callback_data = data;
4175         return rpc_run_task(&task_setup_data);
4176 }
4177
4178 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4179 {
4180         struct nfs_inode *nfsi = NFS_I(state->inode);
4181         struct nfs_seqid *seqid;
4182         struct nfs4_lock_state *lsp;
4183         struct rpc_task *task;
4184         int status = 0;
4185         unsigned char fl_flags = request->fl_flags;
4186
4187         status = nfs4_set_lock_state(state, request);
4188         /* Unlock _before_ we do the RPC call */
4189         request->fl_flags |= FL_EXISTS;
4190         down_read(&nfsi->rwsem);
4191         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4192                 up_read(&nfsi->rwsem);
4193                 goto out;
4194         }
4195         up_read(&nfsi->rwsem);
4196         if (status != 0)
4197                 goto out;
4198         /* Is this a delegated lock? */
4199         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4200                 goto out;
4201         lsp = request->fl_u.nfs4_fl.owner;
4202         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4203         status = -ENOMEM;
4204         if (seqid == NULL)
4205                 goto out;
4206         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4207         status = PTR_ERR(task);
4208         if (IS_ERR(task))
4209                 goto out;
4210         status = nfs4_wait_for_completion_rpc_task(task);
4211         rpc_put_task(task);
4212 out:
4213         request->fl_flags = fl_flags;
4214         return status;
4215 }
4216
4217 struct nfs4_lockdata {
4218         struct nfs_lock_args arg;
4219         struct nfs_lock_res res;
4220         struct nfs4_lock_state *lsp;
4221         struct nfs_open_context *ctx;
4222         struct file_lock fl;
4223         unsigned long timestamp;
4224         int rpc_status;
4225         int cancelled;
4226         struct nfs_server *server;
4227 };
4228
4229 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4230                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4231                 gfp_t gfp_mask)
4232 {
4233         struct nfs4_lockdata *p;
4234         struct inode *inode = lsp->ls_state->inode;
4235         struct nfs_server *server = NFS_SERVER(inode);
4236
4237         p = kzalloc(sizeof(*p), gfp_mask);
4238         if (p == NULL)
4239                 return NULL;
4240
4241         p->arg.fh = NFS_FH(inode);
4242         p->arg.fl = &p->fl;
4243         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4244         if (p->arg.open_seqid == NULL)
4245                 goto out_free;
4246         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4247         if (p->arg.lock_seqid == NULL)
4248                 goto out_free_seqid;
4249         p->arg.lock_stateid = &lsp->ls_stateid;
4250         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4251         p->arg.lock_owner.id = lsp->ls_id.id;
4252         p->arg.lock_owner.s_dev = server->s_dev;
4253         p->res.lock_seqid = p->arg.lock_seqid;
4254         p->lsp = lsp;
4255         p->server = server;
4256         atomic_inc(&lsp->ls_count);
4257         p->ctx = get_nfs_open_context(ctx);
4258         memcpy(&p->fl, fl, sizeof(p->fl));
4259         return p;
4260 out_free_seqid:
4261         nfs_free_seqid(p->arg.open_seqid);
4262 out_free:
4263         kfree(p);
4264         return NULL;
4265 }
4266
4267 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4268 {
4269         struct nfs4_lockdata *data = calldata;
4270         struct nfs4_state *state = data->lsp->ls_state;
4271
4272         dprintk("%s: begin!\n", __func__);
4273         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4274                 return;
4275         /* Do we need to do an open_to_lock_owner? */
4276         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4277                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4278                         return;
4279                 data->arg.open_stateid = &state->stateid;
4280                 data->arg.new_lock_owner = 1;
4281                 data->res.open_seqid = data->arg.open_seqid;
4282         } else
4283                 data->arg.new_lock_owner = 0;
4284         data->timestamp = jiffies;
4285         if (nfs4_setup_sequence(data->server,
4286                                 &data->arg.seq_args,
4287                                 &data->res.seq_res, 1, task))
4288                 return;
4289         rpc_call_start(task);
4290         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4291 }
4292
4293 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4294 {
4295         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4296         nfs4_lock_prepare(task, calldata);
4297 }
4298
4299 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4300 {
4301         struct nfs4_lockdata *data = calldata;
4302
4303         dprintk("%s: begin!\n", __func__);
4304
4305         if (!nfs4_sequence_done(task, &data->res.seq_res))
4306                 return;
4307
4308         data->rpc_status = task->tk_status;
4309         if (data->arg.new_lock_owner != 0) {
4310                 if (data->rpc_status == 0)
4311                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4312                 else
4313                         goto out;
4314         }
4315         if (data->rpc_status == 0) {
4316                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4317                                         sizeof(data->lsp->ls_stateid.data));
4318                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4319                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4320         }
4321 out:
4322         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4323 }
4324
4325 static void nfs4_lock_release(void *calldata)
4326 {
4327         struct nfs4_lockdata *data = calldata;
4328
4329         dprintk("%s: begin!\n", __func__);
4330         nfs_free_seqid(data->arg.open_seqid);
4331         if (data->cancelled != 0) {
4332                 struct rpc_task *task;
4333                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4334                                 data->arg.lock_seqid);
4335                 if (!IS_ERR(task))
4336                         rpc_put_task_async(task);
4337                 dprintk("%s: cancelling lock!\n", __func__);
4338         } else
4339                 nfs_free_seqid(data->arg.lock_seqid);
4340         nfs4_put_lock_state(data->lsp);
4341         put_nfs_open_context(data->ctx);
4342         kfree(data);
4343         dprintk("%s: done!\n", __func__);
4344 }
4345
4346 static const struct rpc_call_ops nfs4_lock_ops = {
4347         .rpc_call_prepare = nfs4_lock_prepare,
4348         .rpc_call_done = nfs4_lock_done,
4349         .rpc_release = nfs4_lock_release,
4350 };
4351
4352 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4353         .rpc_call_prepare = nfs4_recover_lock_prepare,
4354         .rpc_call_done = nfs4_lock_done,
4355         .rpc_release = nfs4_lock_release,
4356 };
4357
4358 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4359 {
4360         switch (error) {
4361         case -NFS4ERR_ADMIN_REVOKED:
4362         case -NFS4ERR_BAD_STATEID:
4363                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4364                 if (new_lock_owner != 0 ||
4365                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4366                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4367                 break;
4368         case -NFS4ERR_STALE_STATEID:
4369                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4370         case -NFS4ERR_EXPIRED:
4371                 nfs4_schedule_lease_recovery(server->nfs_client);
4372         };
4373 }
4374
4375 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4376 {
4377         struct nfs4_lockdata *data;
4378         struct rpc_task *task;
4379         struct rpc_message msg = {
4380                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4381                 .rpc_cred = state->owner->so_cred,
4382         };
4383         struct rpc_task_setup task_setup_data = {
4384                 .rpc_client = NFS_CLIENT(state->inode),
4385                 .rpc_message = &msg,
4386                 .callback_ops = &nfs4_lock_ops,
4387                 .workqueue = nfsiod_workqueue,
4388                 .flags = RPC_TASK_ASYNC,
4389         };
4390         int ret;
4391
4392         dprintk("%s: begin!\n", __func__);
4393         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4394                         fl->fl_u.nfs4_fl.owner,
4395                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4396         if (data == NULL)
4397                 return -ENOMEM;
4398         if (IS_SETLKW(cmd))
4399                 data->arg.block = 1;
4400         if (recovery_type > NFS_LOCK_NEW) {
4401                 if (recovery_type == NFS_LOCK_RECLAIM)
4402                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4403                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4404         }
4405         msg.rpc_argp = &data->arg;
4406         msg.rpc_resp = &data->res;
4407         task_setup_data.callback_data = data;
4408         task = rpc_run_task(&task_setup_data);
4409         if (IS_ERR(task))
4410                 return PTR_ERR(task);
4411         ret = nfs4_wait_for_completion_rpc_task(task);
4412         if (ret == 0) {
4413                 ret = data->rpc_status;
4414                 if (ret)
4415                         nfs4_handle_setlk_error(data->server, data->lsp,
4416                                         data->arg.new_lock_owner, ret);
4417         } else
4418                 data->cancelled = 1;
4419         rpc_put_task(task);
4420         dprintk("%s: done, ret = %d!\n", __func__, ret);
4421         return ret;
4422 }
4423
4424 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4425 {
4426         struct nfs_server *server = NFS_SERVER(state->inode);
4427         struct nfs4_exception exception = { };
4428         int err;
4429
4430         do {
4431                 /* Cache the lock if possible... */
4432                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4433                         return 0;
4434                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4435                 if (err != -NFS4ERR_DELAY)
4436                         break;
4437                 nfs4_handle_exception(server, err, &exception);
4438         } while (exception.retry);
4439         return err;
4440 }
4441
4442 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4443 {
4444         struct nfs_server *server = NFS_SERVER(state->inode);
4445         struct nfs4_exception exception = { };
4446         int err;
4447
4448         err = nfs4_set_lock_state(state, request);
4449         if (err != 0)
4450                 return err;
4451         do {
4452                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4453                         return 0;
4454                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4455                 switch (err) {
4456                 default:
4457                         goto out;
4458                 case -NFS4ERR_GRACE:
4459                 case -NFS4ERR_DELAY:
4460                         nfs4_handle_exception(server, err, &exception);
4461                         err = 0;
4462                 }
4463         } while (exception.retry);
4464 out:
4465         return err;
4466 }
4467
4468 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4469 {
4470         struct nfs_inode *nfsi = NFS_I(state->inode);
4471         unsigned char fl_flags = request->fl_flags;
4472         int status = -ENOLCK;
4473
4474         if ((fl_flags & FL_POSIX) &&
4475                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4476                 goto out;
4477         /* Is this a delegated open? */
4478         status = nfs4_set_lock_state(state, request);
4479         if (status != 0)
4480                 goto out;
4481         request->fl_flags |= FL_ACCESS;
4482         status = do_vfs_lock(request->fl_file, request);
4483         if (status < 0)
4484                 goto out;
4485         down_read(&nfsi->rwsem);
4486         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4487                 /* Yes: cache locks! */
4488                 /* ...but avoid races with delegation recall... */
4489                 request->fl_flags = fl_flags & ~FL_SLEEP;
4490                 status = do_vfs_lock(request->fl_file, request);
4491                 goto out_unlock;
4492         }
4493         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4494         if (status != 0)
4495                 goto out_unlock;
4496         /* Note: we always want to sleep here! */
4497         request->fl_flags = fl_flags | FL_SLEEP;
4498         if (do_vfs_lock(request->fl_file, request) < 0)
4499                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4500 out_unlock:
4501         up_read(&nfsi->rwsem);
4502 out:
4503         request->fl_flags = fl_flags;
4504         return status;
4505 }
4506
4507 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4508 {
4509         struct nfs4_exception exception = {
4510                 .state = state,
4511         };
4512         int err;
4513
4514         do {
4515                 err = _nfs4_proc_setlk(state, cmd, request);
4516                 if (err == -NFS4ERR_DENIED)
4517                         err = -EAGAIN;
4518                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4519                                 err, &exception);
4520         } while (exception.retry);
4521         return err;
4522 }
4523
4524 static int
4525 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4526 {
4527         struct nfs_open_context *ctx;
4528         struct nfs4_state *state;
4529         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4530         int status;
4531
4532         /* verify open state */
4533         ctx = nfs_file_open_context(filp);
4534         state = ctx->state;
4535
4536         if (request->fl_start < 0 || request->fl_end < 0)
4537                 return -EINVAL;
4538
4539         if (IS_GETLK(cmd)) {
4540                 if (state != NULL)
4541                         return nfs4_proc_getlk(state, F_GETLK, request);
4542                 return 0;
4543         }
4544
4545         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4546                 return -EINVAL;
4547
4548         if (request->fl_type == F_UNLCK) {
4549                 if (state != NULL)
4550                         return nfs4_proc_unlck(state, cmd, request);
4551                 return 0;
4552         }
4553
4554         if (state == NULL)
4555                 return -ENOLCK;
4556         do {
4557                 status = nfs4_proc_setlk(state, cmd, request);
4558                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4559                         break;
4560                 timeout = nfs4_set_lock_task_retry(timeout);
4561                 status = -ERESTARTSYS;
4562                 if (signalled())
4563                         break;
4564         } while(status < 0);
4565         return status;
4566 }
4567
4568 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4569 {
4570         struct nfs_server *server = NFS_SERVER(state->inode);
4571         struct nfs4_exception exception = { };
4572         int err;
4573
4574         err = nfs4_set_lock_state(state, fl);
4575         if (err != 0)
4576                 goto out;
4577         do {
4578                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4579                 switch (err) {
4580                         default:
4581                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4582                                                 __func__, err);
4583                         case 0:
4584                         case -ESTALE:
4585                                 goto out;
4586                         case -NFS4ERR_EXPIRED:
4587                                 nfs4_schedule_stateid_recovery(server, state);
4588                         case -NFS4ERR_STALE_CLIENTID:
4589                         case -NFS4ERR_STALE_STATEID:
4590                                 nfs4_schedule_lease_recovery(server->nfs_client);
4591                                 goto out;
4592                         case -NFS4ERR_BADSESSION:
4593                         case -NFS4ERR_BADSLOT:
4594                         case -NFS4ERR_BAD_HIGH_SLOT:
4595                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4596                         case -NFS4ERR_DEADSESSION:
4597                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4598                                 goto out;
4599                         case -ERESTARTSYS:
4600                                 /*
4601                                  * The show must go on: exit, but mark the
4602                                  * stateid as needing recovery.
4603                                  */
4604                         case -NFS4ERR_DELEG_REVOKED:
4605                         case -NFS4ERR_ADMIN_REVOKED:
4606                         case -NFS4ERR_BAD_STATEID:
4607                         case -NFS4ERR_OPENMODE:
4608                                 nfs4_schedule_stateid_recovery(server, state);
4609                                 err = 0;
4610                                 goto out;
4611                         case -EKEYEXPIRED:
4612                                 /*
4613                                  * User RPCSEC_GSS context has expired.
4614                                  * We cannot recover this stateid now, so
4615                                  * skip it and allow recovery thread to
4616                                  * proceed.
4617                                  */
4618                                 err = 0;
4619                                 goto out;
4620                         case -ENOMEM:
4621                         case -NFS4ERR_DENIED:
4622                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4623                                 err = 0;
4624                                 goto out;
4625                         case -NFS4ERR_DELAY:
4626                                 break;
4627                 }
4628                 err = nfs4_handle_exception(server, err, &exception);
4629         } while (exception.retry);
4630 out:
4631         return err;
4632 }
4633
4634 static void nfs4_release_lockowner_release(void *calldata)
4635 {
4636         kfree(calldata);
4637 }
4638
4639 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4640         .rpc_release = nfs4_release_lockowner_release,
4641 };
4642
4643 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4644 {
4645         struct nfs_server *server = lsp->ls_state->owner->so_server;
4646         struct nfs_release_lockowner_args *args;
4647         struct rpc_message msg = {
4648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4649         };
4650
4651         if (server->nfs_client->cl_mvops->minor_version != 0)
4652                 return;
4653         args = kmalloc(sizeof(*args), GFP_NOFS);
4654         if (!args)
4655                 return;
4656         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4657         args->lock_owner.id = lsp->ls_id.id;
4658         args->lock_owner.s_dev = server->s_dev;
4659         msg.rpc_argp = args;
4660         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4661 }
4662
4663 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4664
4665 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4666                                    const void *buf, size_t buflen,
4667                                    int flags, int type)
4668 {
4669         if (strcmp(key, "") != 0)
4670                 return -EINVAL;
4671
4672         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4673 }
4674
4675 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4676                                    void *buf, size_t buflen, int type)
4677 {
4678         if (strcmp(key, "") != 0)
4679                 return -EINVAL;
4680
4681         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4682 }
4683
4684 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4685                                        size_t list_len, const char *name,
4686                                        size_t name_len, int type)
4687 {
4688         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4689
4690         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4691                 return 0;
4692
4693         if (list && len <= list_len)
4694                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4695         return len;
4696 }
4697
4698 /*
4699  * nfs_fhget will use either the mounted_on_fileid or the fileid
4700  */
4701 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4702 {
4703         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4704                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4705               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4706               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4707                 return;
4708
4709         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4710                 NFS_ATTR_FATTR_NLINK;
4711         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4712         fattr->nlink = 2;
4713 }
4714
4715 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4716                 struct nfs4_fs_locations *fs_locations, struct page *page)
4717 {
4718         struct nfs_server *server = NFS_SERVER(dir);
4719         u32 bitmask[2] = {
4720                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4721         };
4722         struct nfs4_fs_locations_arg args = {
4723                 .dir_fh = NFS_FH(dir),
4724                 .name = name,
4725                 .page = page,
4726                 .bitmask = bitmask,
4727         };
4728         struct nfs4_fs_locations_res res = {
4729                 .fs_locations = fs_locations,
4730         };
4731         struct rpc_message msg = {
4732                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4733                 .rpc_argp = &args,
4734                 .rpc_resp = &res,
4735         };
4736         int status;
4737
4738         dprintk("%s: start\n", __func__);
4739
4740         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4741          * is not supported */
4742         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4743                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4744         else
4745                 bitmask[0] |= FATTR4_WORD0_FILEID;
4746
4747         nfs_fattr_init(&fs_locations->fattr);
4748         fs_locations->server = server;
4749         fs_locations->nlocations = 0;
4750         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4751         dprintk("%s: returned status = %d\n", __func__, status);
4752         return status;
4753 }
4754
4755 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4756 {
4757         int status;
4758         struct nfs4_secinfo_arg args = {
4759                 .dir_fh = NFS_FH(dir),
4760                 .name   = name,
4761         };
4762         struct nfs4_secinfo_res res = {
4763                 .flavors     = flavors,
4764         };
4765         struct rpc_message msg = {
4766                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4767                 .rpc_argp = &args,
4768                 .rpc_resp = &res,
4769         };
4770
4771         dprintk("NFS call  secinfo %s\n", name->name);
4772         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4773         dprintk("NFS reply  secinfo: %d\n", status);
4774         return status;
4775 }
4776
4777 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4778 {
4779         struct nfs4_exception exception = { };
4780         int err;
4781         do {
4782                 err = nfs4_handle_exception(NFS_SERVER(dir),
4783                                 _nfs4_proc_secinfo(dir, name, flavors),
4784                                 &exception);
4785         } while (exception.retry);
4786         return err;
4787 }
4788
4789 #ifdef CONFIG_NFS_V4_1
4790 /*
4791  * Check the exchange flags returned by the server for invalid flags, having
4792  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4793  * DS flags set.
4794  */
4795 static int nfs4_check_cl_exchange_flags(u32 flags)
4796 {
4797         if (flags & ~EXCHGID4_FLAG_MASK_R)
4798                 goto out_inval;
4799         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4800             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4801                 goto out_inval;
4802         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4803                 goto out_inval;
4804         return NFS_OK;
4805 out_inval:
4806         return -NFS4ERR_INVAL;
4807 }
4808
4809 /*
4810  * nfs4_proc_exchange_id()
4811  *
4812  * Since the clientid has expired, all compounds using sessions
4813  * associated with the stale clientid will be returning
4814  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4815  * be in some phase of session reset.
4816  */
4817 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4818 {
4819         nfs4_verifier verifier;
4820         struct nfs41_exchange_id_args args = {
4821                 .client = clp,
4822                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4823         };
4824         struct nfs41_exchange_id_res res = {
4825                 .client = clp,
4826         };
4827         int status;
4828         struct rpc_message msg = {
4829                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4830                 .rpc_argp = &args,
4831                 .rpc_resp = &res,
4832                 .rpc_cred = cred,
4833         };
4834         __be32 *p;
4835
4836         dprintk("--> %s\n", __func__);
4837         BUG_ON(clp == NULL);
4838
4839         p = (u32 *)verifier.data;
4840         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4841         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4842         args.verifier = &verifier;
4843
4844         args.id_len = scnprintf(args.id, sizeof(args.id),
4845                                 "%s/%s.%s/%u",
4846                                 clp->cl_ipaddr,
4847                                 init_utsname()->nodename,
4848                                 init_utsname()->domainname,
4849                                 clp->cl_rpcclient->cl_auth->au_flavor);
4850
4851         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4852         if (!status)
4853                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4854         dprintk("<-- %s status= %d\n", __func__, status);
4855         return status;
4856 }
4857
4858 struct nfs4_get_lease_time_data {
4859         struct nfs4_get_lease_time_args *args;
4860         struct nfs4_get_lease_time_res *res;
4861         struct nfs_client *clp;
4862 };
4863
4864 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4865                                         void *calldata)
4866 {
4867         int ret;
4868         struct nfs4_get_lease_time_data *data =
4869                         (struct nfs4_get_lease_time_data *)calldata;
4870
4871         dprintk("--> %s\n", __func__);
4872         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4873         /* just setup sequence, do not trigger session recovery
4874            since we're invoked within one */
4875         ret = nfs41_setup_sequence(data->clp->cl_session,
4876                                    &data->args->la_seq_args,
4877                                    &data->res->lr_seq_res, 0, task);
4878
4879         BUG_ON(ret == -EAGAIN);
4880         rpc_call_start(task);
4881         dprintk("<-- %s\n", __func__);
4882 }
4883
4884 /*
4885  * Called from nfs4_state_manager thread for session setup, so don't recover
4886  * from sequence operation or clientid errors.
4887  */
4888 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4889 {
4890         struct nfs4_get_lease_time_data *data =
4891                         (struct nfs4_get_lease_time_data *)calldata;
4892
4893         dprintk("--> %s\n", __func__);
4894         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4895                 return;
4896         switch (task->tk_status) {
4897         case -NFS4ERR_DELAY:
4898         case -NFS4ERR_GRACE:
4899                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4900                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4901                 task->tk_status = 0;
4902                 /* fall through */
4903         case -NFS4ERR_RETRY_UNCACHED_REP:
4904                 nfs_restart_rpc(task, data->clp);
4905                 return;
4906         }
4907         dprintk("<-- %s\n", __func__);
4908 }
4909
4910 struct rpc_call_ops nfs4_get_lease_time_ops = {
4911         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4912         .rpc_call_done = nfs4_get_lease_time_done,
4913 };
4914
4915 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4916 {
4917         struct rpc_task *task;
4918         struct nfs4_get_lease_time_args args;
4919         struct nfs4_get_lease_time_res res = {
4920                 .lr_fsinfo = fsinfo,
4921         };
4922         struct nfs4_get_lease_time_data data = {
4923                 .args = &args,
4924                 .res = &res,
4925                 .clp = clp,
4926         };
4927         struct rpc_message msg = {
4928                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4929                 .rpc_argp = &args,
4930                 .rpc_resp = &res,
4931         };
4932         struct rpc_task_setup task_setup = {
4933                 .rpc_client = clp->cl_rpcclient,
4934                 .rpc_message = &msg,
4935                 .callback_ops = &nfs4_get_lease_time_ops,
4936                 .callback_data = &data,
4937                 .flags = RPC_TASK_TIMEOUT,
4938         };
4939         int status;
4940
4941         dprintk("--> %s\n", __func__);
4942         task = rpc_run_task(&task_setup);
4943
4944         if (IS_ERR(task))
4945                 status = PTR_ERR(task);
4946         else {
4947                 status = task->tk_status;
4948                 rpc_put_task(task);
4949         }
4950         dprintk("<-- %s return %d\n", __func__, status);
4951
4952         return status;
4953 }
4954
4955 /*
4956  * Reset a slot table
4957  */
4958 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4959                                  int ivalue)
4960 {
4961         struct nfs4_slot *new = NULL;
4962         int i;
4963         int ret = 0;
4964
4965         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4966                 max_reqs, tbl->max_slots);
4967
4968         /* Does the newly negotiated max_reqs match the existing slot table? */
4969         if (max_reqs != tbl->max_slots) {
4970                 ret = -ENOMEM;
4971                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4972                               GFP_NOFS);
4973                 if (!new)
4974                         goto out;
4975                 ret = 0;
4976                 kfree(tbl->slots);
4977         }
4978         spin_lock(&tbl->slot_tbl_lock);
4979         if (new) {
4980                 tbl->slots = new;
4981                 tbl->max_slots = max_reqs;
4982         }
4983         for (i = 0; i < tbl->max_slots; ++i)
4984                 tbl->slots[i].seq_nr = ivalue;
4985         spin_unlock(&tbl->slot_tbl_lock);
4986         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4987                 tbl, tbl->slots, tbl->max_slots);
4988 out:
4989         dprintk("<-- %s: return %d\n", __func__, ret);
4990         return ret;
4991 }
4992
4993 /*
4994  * Reset the forechannel and backchannel slot tables
4995  */
4996 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4997 {
4998         int status;
4999
5000         status = nfs4_reset_slot_table(&session->fc_slot_table,
5001                         session->fc_attrs.max_reqs, 1);
5002         if (status)
5003                 return status;
5004
5005         status = nfs4_reset_slot_table(&session->bc_slot_table,
5006                         session->bc_attrs.max_reqs, 0);
5007         return status;
5008 }
5009
5010 /* Destroy the slot table */
5011 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5012 {
5013         if (session->fc_slot_table.slots != NULL) {
5014                 kfree(session->fc_slot_table.slots);
5015                 session->fc_slot_table.slots = NULL;
5016         }
5017         if (session->bc_slot_table.slots != NULL) {
5018                 kfree(session->bc_slot_table.slots);
5019                 session->bc_slot_table.slots = NULL;
5020         }
5021         return;
5022 }
5023
5024 /*
5025  * Initialize slot table
5026  */
5027 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5028                 int max_slots, int ivalue)
5029 {
5030         struct nfs4_slot *slot;
5031         int ret = -ENOMEM;
5032
5033         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5034
5035         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5036
5037         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5038         if (!slot)
5039                 goto out;
5040         ret = 0;
5041
5042         spin_lock(&tbl->slot_tbl_lock);
5043         tbl->max_slots = max_slots;
5044         tbl->slots = slot;
5045         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5046         spin_unlock(&tbl->slot_tbl_lock);
5047         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5048                 tbl, tbl->slots, tbl->max_slots);
5049 out:
5050         dprintk("<-- %s: return %d\n", __func__, ret);
5051         return ret;
5052 }
5053
5054 /*
5055  * Initialize the forechannel and backchannel tables
5056  */
5057 static int nfs4_init_slot_tables(struct nfs4_session *session)
5058 {
5059         struct nfs4_slot_table *tbl;
5060         int status = 0;
5061
5062         tbl = &session->fc_slot_table;
5063         if (tbl->slots == NULL) {
5064                 status = nfs4_init_slot_table(tbl,
5065                                 session->fc_attrs.max_reqs, 1);
5066                 if (status)
5067                         return status;
5068         }
5069
5070         tbl = &session->bc_slot_table;
5071         if (tbl->slots == NULL) {
5072                 status = nfs4_init_slot_table(tbl,
5073                                 session->bc_attrs.max_reqs, 0);
5074                 if (status)
5075                         nfs4_destroy_slot_tables(session);
5076         }
5077
5078         return status;
5079 }
5080
5081 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5082 {
5083         struct nfs4_session *session;
5084         struct nfs4_slot_table *tbl;
5085
5086         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5087         if (!session)
5088                 return NULL;
5089
5090         tbl = &session->fc_slot_table;
5091         tbl->highest_used_slotid = -1;
5092         spin_lock_init(&tbl->slot_tbl_lock);
5093         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5094         init_completion(&tbl->complete);
5095
5096         tbl = &session->bc_slot_table;
5097         tbl->highest_used_slotid = -1;
5098         spin_lock_init(&tbl->slot_tbl_lock);
5099         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5100         init_completion(&tbl->complete);
5101
5102         session->session_state = 1<<NFS4_SESSION_INITING;
5103
5104         session->clp = clp;
5105         return session;
5106 }
5107
5108 void nfs4_destroy_session(struct nfs4_session *session)
5109 {
5110         nfs4_proc_destroy_session(session);
5111         dprintk("%s Destroy backchannel for xprt %p\n",
5112                 __func__, session->clp->cl_rpcclient->cl_xprt);
5113         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5114                                 NFS41_BC_MIN_CALLBACKS);
5115         nfs4_destroy_slot_tables(session);
5116         kfree(session);
5117 }
5118
5119 /*
5120  * Initialize the values to be used by the client in CREATE_SESSION
5121  * If nfs4_init_session set the fore channel request and response sizes,
5122  * use them.
5123  *
5124  * Set the back channel max_resp_sz_cached to zero to force the client to
5125  * always set csa_cachethis to FALSE because the current implementation
5126  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5127  */
5128 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5129 {
5130         struct nfs4_session *session = args->client->cl_session;
5131         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5132                      mxresp_sz = session->fc_attrs.max_resp_sz;
5133
5134         if (mxrqst_sz == 0)
5135                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5136         if (mxresp_sz == 0)
5137                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5138         /* Fore channel attributes */
5139         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5140         args->fc_attrs.max_resp_sz = mxresp_sz;
5141         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5142         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5143
5144         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5145                 "max_ops=%u max_reqs=%u\n",
5146                 __func__,
5147                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5148                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5149
5150         /* Back channel attributes */
5151         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5152         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5153         args->bc_attrs.max_resp_sz_cached = 0;
5154         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5155         args->bc_attrs.max_reqs = 1;
5156
5157         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5158                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5159                 __func__,
5160                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5161                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5162                 args->bc_attrs.max_reqs);
5163 }
5164
5165 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5166 {
5167         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5168         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5169
5170         if (rcvd->max_resp_sz > sent->max_resp_sz)
5171                 return -EINVAL;
5172         /*
5173          * Our requested max_ops is the minimum we need; we're not
5174          * prepared to break up compounds into smaller pieces than that.
5175          * So, no point even trying to continue if the server won't
5176          * cooperate:
5177          */
5178         if (rcvd->max_ops < sent->max_ops)
5179                 return -EINVAL;
5180         if (rcvd->max_reqs == 0)
5181                 return -EINVAL;
5182         return 0;
5183 }
5184
5185 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5186 {
5187         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5188         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5189
5190         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5191                 return -EINVAL;
5192         if (rcvd->max_resp_sz < sent->max_resp_sz)
5193                 return -EINVAL;
5194         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5195                 return -EINVAL;
5196         /* These would render the backchannel useless: */
5197         if (rcvd->max_ops  == 0)
5198                 return -EINVAL;
5199         if (rcvd->max_reqs == 0)
5200                 return -EINVAL;
5201         return 0;
5202 }
5203
5204 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5205                                      struct nfs4_session *session)
5206 {
5207         int ret;
5208
5209         ret = nfs4_verify_fore_channel_attrs(args, session);
5210         if (ret)
5211                 return ret;
5212         return nfs4_verify_back_channel_attrs(args, session);
5213 }
5214
5215 static int _nfs4_proc_create_session(struct nfs_client *clp)
5216 {
5217         struct nfs4_session *session = clp->cl_session;
5218         struct nfs41_create_session_args args = {
5219                 .client = clp,
5220                 .cb_program = NFS4_CALLBACK,
5221         };
5222         struct nfs41_create_session_res res = {
5223                 .client = clp,
5224         };
5225         struct rpc_message msg = {
5226                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5227                 .rpc_argp = &args,
5228                 .rpc_resp = &res,
5229         };
5230         int status;
5231
5232         nfs4_init_channel_attrs(&args);
5233         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5234
5235         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5236
5237         if (!status)
5238                 /* Verify the session's negotiated channel_attrs values */
5239                 status = nfs4_verify_channel_attrs(&args, session);
5240         if (!status) {
5241                 /* Increment the clientid slot sequence id */
5242                 clp->cl_seqid++;
5243         }
5244
5245         return status;
5246 }
5247
5248 /*
5249  * Issues a CREATE_SESSION operation to the server.
5250  * It is the responsibility of the caller to verify the session is
5251  * expired before calling this routine.
5252  */
5253 int nfs4_proc_create_session(struct nfs_client *clp)
5254 {
5255         int status;
5256         unsigned *ptr;
5257         struct nfs4_session *session = clp->cl_session;
5258
5259         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5260
5261         status = _nfs4_proc_create_session(clp);
5262         if (status)
5263                 goto out;
5264
5265         /* Init and reset the fore channel */
5266         status = nfs4_init_slot_tables(session);
5267         dprintk("slot table initialization returned %d\n", status);
5268         if (status)
5269                 goto out;
5270         status = nfs4_reset_slot_tables(session);
5271         dprintk("slot table reset returned %d\n", status);
5272         if (status)
5273                 goto out;
5274
5275         ptr = (unsigned *)&session->sess_id.data[0];
5276         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5277                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5278 out:
5279         dprintk("<-- %s\n", __func__);
5280         return status;
5281 }
5282
5283 /*
5284  * Issue the over-the-wire RPC DESTROY_SESSION.
5285  * The caller must serialize access to this routine.
5286  */
5287 int nfs4_proc_destroy_session(struct nfs4_session *session)
5288 {
5289         int status = 0;
5290         struct rpc_message msg;
5291
5292         dprintk("--> nfs4_proc_destroy_session\n");
5293
5294         /* session is still being setup */
5295         if (session->clp->cl_cons_state != NFS_CS_READY)
5296                 return status;
5297
5298         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5299         msg.rpc_argp = session;
5300         msg.rpc_resp = NULL;
5301         msg.rpc_cred = NULL;
5302         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5303
5304         if (status)
5305                 printk(KERN_WARNING
5306                         "Got error %d from the server on DESTROY_SESSION. "
5307                         "Session has been destroyed regardless...\n", status);
5308
5309         dprintk("<-- nfs4_proc_destroy_session\n");
5310         return status;
5311 }
5312
5313 int nfs4_init_session(struct nfs_server *server)
5314 {
5315         struct nfs_client *clp = server->nfs_client;
5316         struct nfs4_session *session;
5317         unsigned int rsize, wsize;
5318         int ret;
5319
5320         if (!nfs4_has_session(clp))
5321                 return 0;
5322
5323         session = clp->cl_session;
5324         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5325                 return 0;
5326
5327         rsize = server->rsize;
5328         if (rsize == 0)
5329                 rsize = NFS_MAX_FILE_IO_SIZE;
5330         wsize = server->wsize;
5331         if (wsize == 0)
5332                 wsize = NFS_MAX_FILE_IO_SIZE;
5333
5334         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5335         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5336
5337         ret = nfs4_recover_expired_lease(server);
5338         if (!ret)
5339                 ret = nfs4_check_client_ready(clp);
5340         return ret;
5341 }
5342
5343 int nfs4_init_ds_session(struct nfs_client *clp)
5344 {
5345         struct nfs4_session *session = clp->cl_session;
5346         int ret;
5347
5348         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5349                 return 0;
5350
5351         ret = nfs4_client_recover_expired_lease(clp);
5352         if (!ret)
5353                 /* Test for the DS role */
5354                 if (!is_ds_client(clp))
5355                         ret = -ENODEV;
5356         if (!ret)
5357                 ret = nfs4_check_client_ready(clp);
5358         return ret;
5359
5360 }
5361 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5362
5363
5364 /*
5365  * Renew the cl_session lease.
5366  */
5367 struct nfs4_sequence_data {
5368         struct nfs_client *clp;
5369         struct nfs4_sequence_args args;
5370         struct nfs4_sequence_res res;
5371 };
5372
5373 static void nfs41_sequence_release(void *data)
5374 {
5375         struct nfs4_sequence_data *calldata = data;
5376         struct nfs_client *clp = calldata->clp;
5377
5378         if (atomic_read(&clp->cl_count) > 1)
5379                 nfs4_schedule_state_renewal(clp);
5380         nfs_put_client(clp);
5381         kfree(calldata);
5382 }
5383
5384 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5385 {
5386         switch(task->tk_status) {
5387         case -NFS4ERR_DELAY:
5388                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5389                 return -EAGAIN;
5390         default:
5391                 nfs4_schedule_lease_recovery(clp);
5392         }
5393         return 0;
5394 }
5395
5396 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5397 {
5398         struct nfs4_sequence_data *calldata = data;
5399         struct nfs_client *clp = calldata->clp;
5400
5401         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5402                 return;
5403
5404         if (task->tk_status < 0) {
5405                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5406                 if (atomic_read(&clp->cl_count) == 1)
5407                         goto out;
5408
5409                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5410                         rpc_restart_call_prepare(task);
5411                         return;
5412                 }
5413         }
5414         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5415 out:
5416         dprintk("<-- %s\n", __func__);
5417 }
5418
5419 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5420 {
5421         struct nfs4_sequence_data *calldata = data;
5422         struct nfs_client *clp = calldata->clp;
5423         struct nfs4_sequence_args *args;
5424         struct nfs4_sequence_res *res;
5425
5426         args = task->tk_msg.rpc_argp;
5427         res = task->tk_msg.rpc_resp;
5428
5429         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5430                 return;
5431         rpc_call_start(task);
5432 }
5433
5434 static const struct rpc_call_ops nfs41_sequence_ops = {
5435         .rpc_call_done = nfs41_sequence_call_done,
5436         .rpc_call_prepare = nfs41_sequence_prepare,
5437         .rpc_release = nfs41_sequence_release,
5438 };
5439
5440 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5441 {
5442         struct nfs4_sequence_data *calldata;
5443         struct rpc_message msg = {
5444                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5445                 .rpc_cred = cred,
5446         };
5447         struct rpc_task_setup task_setup_data = {
5448                 .rpc_client = clp->cl_rpcclient,
5449                 .rpc_message = &msg,
5450                 .callback_ops = &nfs41_sequence_ops,
5451                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5452         };
5453
5454         if (!atomic_inc_not_zero(&clp->cl_count))
5455                 return ERR_PTR(-EIO);
5456         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5457         if (calldata == NULL) {
5458                 nfs_put_client(clp);
5459                 return ERR_PTR(-ENOMEM);
5460         }
5461         msg.rpc_argp = &calldata->args;
5462         msg.rpc_resp = &calldata->res;
5463         calldata->clp = clp;
5464         task_setup_data.callback_data = calldata;
5465
5466         return rpc_run_task(&task_setup_data);
5467 }
5468
5469 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5470 {
5471         struct rpc_task *task;
5472         int ret = 0;
5473
5474         task = _nfs41_proc_sequence(clp, cred);
5475         if (IS_ERR(task))
5476                 ret = PTR_ERR(task);
5477         else
5478                 rpc_put_task_async(task);
5479         dprintk("<-- %s status=%d\n", __func__, ret);
5480         return ret;
5481 }
5482
5483 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5484 {
5485         struct rpc_task *task;
5486         int ret;
5487
5488         task = _nfs41_proc_sequence(clp, cred);
5489         if (IS_ERR(task)) {
5490                 ret = PTR_ERR(task);
5491                 goto out;
5492         }
5493         ret = rpc_wait_for_completion_task(task);
5494         if (!ret) {
5495                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5496
5497                 if (task->tk_status == 0)
5498                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5499                 ret = task->tk_status;
5500         }
5501         rpc_put_task(task);
5502 out:
5503         dprintk("<-- %s status=%d\n", __func__, ret);
5504         return ret;
5505 }
5506
5507 struct nfs4_reclaim_complete_data {
5508         struct nfs_client *clp;
5509         struct nfs41_reclaim_complete_args arg;
5510         struct nfs41_reclaim_complete_res res;
5511 };
5512
5513 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5514 {
5515         struct nfs4_reclaim_complete_data *calldata = data;
5516
5517         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5518         if (nfs41_setup_sequence(calldata->clp->cl_session,
5519                                 &calldata->arg.seq_args,
5520                                 &calldata->res.seq_res, 0, task))
5521                 return;
5522
5523         rpc_call_start(task);
5524 }
5525
5526 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5527 {
5528         switch(task->tk_status) {
5529         case 0:
5530         case -NFS4ERR_COMPLETE_ALREADY:
5531         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5532                 break;
5533         case -NFS4ERR_DELAY:
5534                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5535                 /* fall through */
5536         case -NFS4ERR_RETRY_UNCACHED_REP:
5537                 return -EAGAIN;
5538         default:
5539                 nfs4_schedule_lease_recovery(clp);
5540         }
5541         return 0;
5542 }
5543
5544 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5545 {
5546         struct nfs4_reclaim_complete_data *calldata = data;
5547         struct nfs_client *clp = calldata->clp;
5548         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5549
5550         dprintk("--> %s\n", __func__);
5551         if (!nfs41_sequence_done(task, res))
5552                 return;
5553
5554         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5555                 rpc_restart_call_prepare(task);
5556                 return;
5557         }
5558         dprintk("<-- %s\n", __func__);
5559 }
5560
5561 static void nfs4_free_reclaim_complete_data(void *data)
5562 {
5563         struct nfs4_reclaim_complete_data *calldata = data;
5564
5565         kfree(calldata);
5566 }
5567
5568 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5569         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5570         .rpc_call_done = nfs4_reclaim_complete_done,
5571         .rpc_release = nfs4_free_reclaim_complete_data,
5572 };
5573
5574 /*
5575  * Issue a global reclaim complete.
5576  */
5577 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5578 {
5579         struct nfs4_reclaim_complete_data *calldata;
5580         struct rpc_task *task;
5581         struct rpc_message msg = {
5582                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5583         };
5584         struct rpc_task_setup task_setup_data = {
5585                 .rpc_client = clp->cl_rpcclient,
5586                 .rpc_message = &msg,
5587                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5588                 .flags = RPC_TASK_ASYNC,
5589         };
5590         int status = -ENOMEM;
5591
5592         dprintk("--> %s\n", __func__);
5593         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5594         if (calldata == NULL)
5595                 goto out;
5596         calldata->clp = clp;
5597         calldata->arg.one_fs = 0;
5598
5599         msg.rpc_argp = &calldata->arg;
5600         msg.rpc_resp = &calldata->res;
5601         task_setup_data.callback_data = calldata;
5602         task = rpc_run_task(&task_setup_data);
5603         if (IS_ERR(task)) {
5604                 status = PTR_ERR(task);
5605                 goto out;
5606         }
5607         status = nfs4_wait_for_completion_rpc_task(task);
5608         if (status == 0)
5609                 status = task->tk_status;
5610         rpc_put_task(task);
5611         return 0;
5612 out:
5613         dprintk("<-- %s status=%d\n", __func__, status);
5614         return status;
5615 }
5616
5617 static void
5618 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5619 {
5620         struct nfs4_layoutget *lgp = calldata;
5621         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5622
5623         dprintk("--> %s\n", __func__);
5624         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5625          * right now covering the LAYOUTGET we are about to send.
5626          * However, that is not so catastrophic, and there seems
5627          * to be no way to prevent it completely.
5628          */
5629         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5630                                 &lgp->res.seq_res, 0, task))
5631                 return;
5632         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5633                                           NFS_I(lgp->args.inode)->layout,
5634                                           lgp->args.ctx->state)) {
5635                 rpc_exit(task, NFS4_OK);
5636                 return;
5637         }
5638         rpc_call_start(task);
5639 }
5640
5641 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5642 {
5643         struct nfs4_layoutget *lgp = calldata;
5644         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5645
5646         dprintk("--> %s\n", __func__);
5647
5648         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5649                 return;
5650
5651         switch (task->tk_status) {
5652         case 0:
5653                 break;
5654         case -NFS4ERR_LAYOUTTRYLATER:
5655         case -NFS4ERR_RECALLCONFLICT:
5656                 task->tk_status = -NFS4ERR_DELAY;
5657                 /* Fall through */
5658         default:
5659                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5660                         rpc_restart_call_prepare(task);
5661                         return;
5662                 }
5663         }
5664         dprintk("<-- %s\n", __func__);
5665 }
5666
5667 static void nfs4_layoutget_release(void *calldata)
5668 {
5669         struct nfs4_layoutget *lgp = calldata;
5670
5671         dprintk("--> %s\n", __func__);
5672         put_nfs_open_context(lgp->args.ctx);
5673         kfree(calldata);
5674         dprintk("<-- %s\n", __func__);
5675 }
5676
5677 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5678         .rpc_call_prepare = nfs4_layoutget_prepare,
5679         .rpc_call_done = nfs4_layoutget_done,
5680         .rpc_release = nfs4_layoutget_release,
5681 };
5682
5683 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5684 {
5685         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5686         struct rpc_task *task;
5687         struct rpc_message msg = {
5688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5689                 .rpc_argp = &lgp->args,
5690                 .rpc_resp = &lgp->res,
5691         };
5692         struct rpc_task_setup task_setup_data = {
5693                 .rpc_client = server->client,
5694                 .rpc_message = &msg,
5695                 .callback_ops = &nfs4_layoutget_call_ops,
5696                 .callback_data = lgp,
5697                 .flags = RPC_TASK_ASYNC,
5698         };
5699         int status = 0;
5700
5701         dprintk("--> %s\n", __func__);
5702
5703         lgp->res.layoutp = &lgp->args.layout;
5704         lgp->res.seq_res.sr_slot = NULL;
5705         task = rpc_run_task(&task_setup_data);
5706         if (IS_ERR(task))
5707                 return PTR_ERR(task);
5708         status = nfs4_wait_for_completion_rpc_task(task);
5709         if (status == 0)
5710                 status = task->tk_status;
5711         if (status == 0)
5712                 status = pnfs_layout_process(lgp);
5713         rpc_put_task(task);
5714         dprintk("<-- %s status=%d\n", __func__, status);
5715         return status;
5716 }
5717
5718 static void
5719 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5720 {
5721         struct nfs4_layoutreturn *lrp = calldata;
5722
5723         dprintk("--> %s\n", __func__);
5724         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5725                                 &lrp->res.seq_res, 0, task))
5726                 return;
5727         rpc_call_start(task);
5728 }
5729
5730 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5731 {
5732         struct nfs4_layoutreturn *lrp = calldata;
5733         struct nfs_server *server;
5734         struct pnfs_layout_hdr *lo = NFS_I(lrp->args.inode)->layout;
5735
5736         dprintk("--> %s\n", __func__);
5737
5738         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5739                 return;
5740
5741         server = NFS_SERVER(lrp->args.inode);
5742         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5743                 nfs_restart_rpc(task, lrp->clp);
5744                 return;
5745         }
5746         spin_lock(&lo->plh_inode->i_lock);
5747         if (task->tk_status == 0) {
5748                 if (lrp->res.lrs_present) {
5749                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5750                 } else
5751                         BUG_ON(!list_empty(&lo->plh_segs));
5752         }
5753         lo->plh_block_lgets--;
5754         spin_unlock(&lo->plh_inode->i_lock);
5755         dprintk("<-- %s\n", __func__);
5756 }
5757
5758 static void nfs4_layoutreturn_release(void *calldata)
5759 {
5760         struct nfs4_layoutreturn *lrp = calldata;
5761
5762         dprintk("--> %s\n", __func__);
5763         put_layout_hdr(NFS_I(lrp->args.inode)->layout);
5764         kfree(calldata);
5765         dprintk("<-- %s\n", __func__);
5766 }
5767
5768 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5769         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5770         .rpc_call_done = nfs4_layoutreturn_done,
5771         .rpc_release = nfs4_layoutreturn_release,
5772 };
5773
5774 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5775 {
5776         struct rpc_task *task;
5777         struct rpc_message msg = {
5778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5779                 .rpc_argp = &lrp->args,
5780                 .rpc_resp = &lrp->res,
5781         };
5782         struct rpc_task_setup task_setup_data = {
5783                 .rpc_client = lrp->clp->cl_rpcclient,
5784                 .rpc_message = &msg,
5785                 .callback_ops = &nfs4_layoutreturn_call_ops,
5786                 .callback_data = lrp,
5787         };
5788         int status;
5789
5790         dprintk("--> %s\n", __func__);
5791         task = rpc_run_task(&task_setup_data);
5792         if (IS_ERR(task))
5793                 return PTR_ERR(task);
5794         status = task->tk_status;
5795         dprintk("<-- %s status=%d\n", __func__, status);
5796         rpc_put_task(task);
5797         return status;
5798 }
5799
5800 static int
5801 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5802 {
5803         struct nfs4_getdeviceinfo_args args = {
5804                 .pdev = pdev,
5805         };
5806         struct nfs4_getdeviceinfo_res res = {
5807                 .pdev = pdev,
5808         };
5809         struct rpc_message msg = {
5810                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5811                 .rpc_argp = &args,
5812                 .rpc_resp = &res,
5813         };
5814         int status;
5815
5816         dprintk("--> %s\n", __func__);
5817         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5818         dprintk("<-- %s status=%d\n", __func__, status);
5819
5820         return status;
5821 }
5822
5823 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5824 {
5825         struct nfs4_exception exception = { };
5826         int err;
5827
5828         do {
5829                 err = nfs4_handle_exception(server,
5830                                         _nfs4_proc_getdeviceinfo(server, pdev),
5831                                         &exception);
5832         } while (exception.retry);
5833         return err;
5834 }
5835 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5836
5837 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5838 {
5839         struct nfs4_layoutcommit_data *data = calldata;
5840         struct nfs_server *server = NFS_SERVER(data->args.inode);
5841
5842         if (nfs4_setup_sequence(server, &data->args.seq_args,
5843                                 &data->res.seq_res, 1, task))
5844                 return;
5845         rpc_call_start(task);
5846 }
5847
5848 static void
5849 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5850 {
5851         struct nfs4_layoutcommit_data *data = calldata;
5852         struct nfs_server *server = NFS_SERVER(data->args.inode);
5853
5854         if (!nfs4_sequence_done(task, &data->res.seq_res))
5855                 return;
5856
5857         switch (task->tk_status) { /* Just ignore these failures */
5858         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5859         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5860         case NFS4ERR_BADLAYOUT:     /* no layout */
5861         case NFS4ERR_GRACE:         /* loca_recalim always false */
5862                 task->tk_status = 0;
5863         }
5864
5865         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5866                 nfs_restart_rpc(task, server->nfs_client);
5867                 return;
5868         }
5869
5870         if (task->tk_status == 0)
5871                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5872                                                    data->res.fattr);
5873 }
5874
5875 static void nfs4_layoutcommit_release(void *calldata)
5876 {
5877         struct nfs4_layoutcommit_data *data = calldata;
5878         struct pnfs_layout_segment *lseg, *tmp;
5879
5880         /* Matched by references in pnfs_set_layoutcommit */
5881         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5882                 list_del_init(&lseg->pls_lc_list);
5883                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5884                                        &lseg->pls_flags))
5885                         put_lseg(lseg);
5886         }
5887         put_rpccred(data->cred);
5888         kfree(data);
5889 }
5890
5891 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5892         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5893         .rpc_call_done = nfs4_layoutcommit_done,
5894         .rpc_release = nfs4_layoutcommit_release,
5895 };
5896
5897 int
5898 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5899 {
5900         struct rpc_message msg = {
5901                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5902                 .rpc_argp = &data->args,
5903                 .rpc_resp = &data->res,
5904                 .rpc_cred = data->cred,
5905         };
5906         struct rpc_task_setup task_setup_data = {
5907                 .task = &data->task,
5908                 .rpc_client = NFS_CLIENT(data->args.inode),
5909                 .rpc_message = &msg,
5910                 .callback_ops = &nfs4_layoutcommit_ops,
5911                 .callback_data = data,
5912                 .flags = RPC_TASK_ASYNC,
5913         };
5914         struct rpc_task *task;
5915         int status = 0;
5916
5917         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5918                 "lbw: %llu inode %lu\n",
5919                 data->task.tk_pid, sync,
5920                 data->args.lastbytewritten,
5921                 data->args.inode->i_ino);
5922
5923         task = rpc_run_task(&task_setup_data);
5924         if (IS_ERR(task))
5925                 return PTR_ERR(task);
5926         if (sync == false)
5927                 goto out;
5928         status = nfs4_wait_for_completion_rpc_task(task);
5929         if (status != 0)
5930                 goto out;
5931         status = task->tk_status;
5932 out:
5933         dprintk("%s: status %d\n", __func__, status);
5934         rpc_put_task(task);
5935         return status;
5936 }
5937 #endif /* CONFIG_NFS_V4_1 */
5938
5939 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5940         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5941         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5942         .recover_open   = nfs4_open_reclaim,
5943         .recover_lock   = nfs4_lock_reclaim,
5944         .establish_clid = nfs4_init_clientid,
5945         .get_clid_cred  = nfs4_get_setclientid_cred,
5946 };
5947
5948 #if defined(CONFIG_NFS_V4_1)
5949 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5950         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5951         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5952         .recover_open   = nfs4_open_reclaim,
5953         .recover_lock   = nfs4_lock_reclaim,
5954         .establish_clid = nfs41_init_clientid,
5955         .get_clid_cred  = nfs4_get_exchange_id_cred,
5956         .reclaim_complete = nfs41_proc_reclaim_complete,
5957 };
5958 #endif /* CONFIG_NFS_V4_1 */
5959
5960 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5961         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5962         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5963         .recover_open   = nfs4_open_expired,
5964         .recover_lock   = nfs4_lock_expired,
5965         .establish_clid = nfs4_init_clientid,
5966         .get_clid_cred  = nfs4_get_setclientid_cred,
5967 };
5968
5969 #if defined(CONFIG_NFS_V4_1)
5970 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5971         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5972         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5973         .recover_open   = nfs4_open_expired,
5974         .recover_lock   = nfs4_lock_expired,
5975         .establish_clid = nfs41_init_clientid,
5976         .get_clid_cred  = nfs4_get_exchange_id_cred,
5977 };
5978 #endif /* CONFIG_NFS_V4_1 */
5979
5980 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5981         .sched_state_renewal = nfs4_proc_async_renew,
5982         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5983         .renew_lease = nfs4_proc_renew,
5984 };
5985
5986 #if defined(CONFIG_NFS_V4_1)
5987 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5988         .sched_state_renewal = nfs41_proc_async_sequence,
5989         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5990         .renew_lease = nfs4_proc_sequence,
5991 };
5992 #endif
5993
5994 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5995         .minor_version = 0,
5996         .call_sync = _nfs4_call_sync,
5997         .validate_stateid = nfs4_validate_delegation_stateid,
5998         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5999         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6000         .state_renewal_ops = &nfs40_state_renewal_ops,
6001 };
6002
6003 #if defined(CONFIG_NFS_V4_1)
6004 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6005         .minor_version = 1,
6006         .call_sync = _nfs4_call_sync_session,
6007         .validate_stateid = nfs41_validate_delegation_stateid,
6008         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6009         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6010         .state_renewal_ops = &nfs41_state_renewal_ops,
6011 };
6012 #endif
6013
6014 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6015         [0] = &nfs_v4_0_minor_ops,
6016 #if defined(CONFIG_NFS_V4_1)
6017         [1] = &nfs_v4_1_minor_ops,
6018 #endif
6019 };
6020
6021 static const struct inode_operations nfs4_file_inode_operations = {
6022         .permission     = nfs_permission,
6023         .getattr        = nfs_getattr,
6024         .setattr        = nfs_setattr,
6025         .getxattr       = generic_getxattr,
6026         .setxattr       = generic_setxattr,
6027         .listxattr      = generic_listxattr,
6028         .removexattr    = generic_removexattr,
6029 };
6030
6031 const struct nfs_rpc_ops nfs_v4_clientops = {
6032         .version        = 4,                    /* protocol version */
6033         .dentry_ops     = &nfs4_dentry_operations,
6034         .dir_inode_ops  = &nfs4_dir_inode_operations,
6035         .file_inode_ops = &nfs4_file_inode_operations,
6036         .file_ops       = &nfs4_file_operations,
6037         .getroot        = nfs4_proc_get_root,
6038         .getattr        = nfs4_proc_getattr,
6039         .setattr        = nfs4_proc_setattr,
6040         .lookupfh       = nfs4_proc_lookupfh,
6041         .lookup         = nfs4_proc_lookup,
6042         .access         = nfs4_proc_access,
6043         .readlink       = nfs4_proc_readlink,
6044         .create         = nfs4_proc_create,
6045         .remove         = nfs4_proc_remove,
6046         .unlink_setup   = nfs4_proc_unlink_setup,
6047         .unlink_done    = nfs4_proc_unlink_done,
6048         .rename         = nfs4_proc_rename,
6049         .rename_setup   = nfs4_proc_rename_setup,
6050         .rename_done    = nfs4_proc_rename_done,
6051         .link           = nfs4_proc_link,
6052         .symlink        = nfs4_proc_symlink,
6053         .mkdir          = nfs4_proc_mkdir,
6054         .rmdir          = nfs4_proc_remove,
6055         .readdir        = nfs4_proc_readdir,
6056         .mknod          = nfs4_proc_mknod,
6057         .statfs         = nfs4_proc_statfs,
6058         .fsinfo         = nfs4_proc_fsinfo,
6059         .pathconf       = nfs4_proc_pathconf,
6060         .set_capabilities = nfs4_server_capabilities,
6061         .decode_dirent  = nfs4_decode_dirent,
6062         .read_setup     = nfs4_proc_read_setup,
6063         .read_done      = nfs4_read_done,
6064         .write_setup    = nfs4_proc_write_setup,
6065         .write_done     = nfs4_write_done,
6066         .commit_setup   = nfs4_proc_commit_setup,
6067         .commit_done    = nfs4_commit_done,
6068         .lock           = nfs4_proc_lock,
6069         .clear_acl_cache = nfs4_zap_acl_attr,
6070         .close_context  = nfs4_close_context,
6071         .open_context   = nfs4_atomic_open,
6072         .init_client    = nfs4_init_client,
6073         .secinfo        = nfs4_proc_secinfo,
6074 };
6075
6076 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6077         .prefix = XATTR_NAME_NFSV4_ACL,
6078         .list   = nfs4_xattr_list_nfs4_acl,
6079         .get    = nfs4_xattr_get_nfs4_acl,
6080         .set    = nfs4_xattr_set_nfs4_acl,
6081 };
6082
6083 const struct xattr_handler *nfs4_xattr_handlers[] = {
6084         &nfs4_xattr_nfs4_acl_handler,
6085         NULL
6086 };
6087
6088 /*
6089  * Local variables:
6090  *  c-basic-offset: 8
6091  * End:
6092  */