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/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  66 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  67 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 static int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __func__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static int nfs4_wait_bit_killable(void *word)
 197 {
 198         if (fatal_signal_pending(current))
 199                 return -ERESTARTSYS;
 200         schedule();
 201         return 0;
 202 }
 203
 204 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 205 {
 206         int res;
 207
 208         might_sleep();
 209
 210         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 211                         nfs4_wait_bit_killable, TASK_KILLABLE);
 212         return res;
 213 }
 214
 215 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 216 {
 217         int res = 0;
 218
 219         might_sleep();
 220
 221         if (*timeout <= 0)
 222                 *timeout = NFS4_POLL_RETRY_MIN;
 223         if (*timeout > NFS4_POLL_RETRY_MAX)
 224                 *timeout = NFS4_POLL_RETRY_MAX;
 225         schedule_timeout_killable(*timeout);
 226         if (fatal_signal_pending(current))
 227                 res = -ERESTARTSYS;
 228         *timeout <<= 1;
 229         return res;
 230 }
 231
 232 /* This is the error handling routine for processes that are allowed
 233  * to sleep.
 234  */
 235 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 236 {
 237         struct nfs_client *clp = server->nfs_client;
 238         struct nfs4_state *state = exception->state;
 239         int ret = errorcode;
 240
 241         exception->retry = 0;
 242         switch(errorcode) {
 243                 case 0:
 244                         return 0;
 245                 case -NFS4ERR_ADMIN_REVOKED:
 246                 case -NFS4ERR_BAD_STATEID:
 247                 case -NFS4ERR_OPENMODE:
 248                         if (state == NULL)
 249                                 break;
 250                         nfs4_state_mark_reclaim_nograce(clp, state);
 251                 case -NFS4ERR_STALE_CLIENTID:
 252                 case -NFS4ERR_STALE_STATEID:
 253                 case -NFS4ERR_EXPIRED:
 254                         nfs4_schedule_state_recovery(clp);
 255                         ret = nfs4_wait_clnt_recover(clp);
 256                         if (ret == 0)
 257                                 exception->retry = 1;
 258                         break;
 259                 case -NFS4ERR_FILE_OPEN:
 260                 case -NFS4ERR_GRACE:
 261                 case -NFS4ERR_DELAY:
 262                         ret = nfs4_delay(server->client, &exception->timeout);
 263                         if (ret != 0)
 264                                 break;
 265                 case -NFS4ERR_OLD_STATEID:
 266                         exception->retry = 1;
 267         }
 268         /* We failed to handle the error */
 269         return nfs4_map_errors(ret);
 270 }
 271
 272
 273 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 274 {
 275         struct nfs_client *clp = server->nfs_client;
 276         spin_lock(&clp->cl_lock);
 277         if (time_before(clp->cl_last_renewal,timestamp))
 278                 clp->cl_last_renewal = timestamp;
 279         spin_unlock(&clp->cl_lock);
 280 }
 281
 282 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 283 {
 284         struct nfs_inode *nfsi = NFS_I(dir);
 285
 286         spin_lock(&dir->i_lock);
 287         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 288         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 289                 nfs_force_lookup_revalidate(dir);
 290         nfsi->change_attr = cinfo->after;
 291         spin_unlock(&dir->i_lock);
 292 }
 293
 294 struct nfs4_opendata {
 295         struct kref kref;
 296         struct nfs_openargs o_arg;
 297         struct nfs_openres o_res;
 298         struct nfs_open_confirmargs c_arg;
 299         struct nfs_open_confirmres c_res;
 300         struct nfs_fattr f_attr;
 301         struct nfs_fattr dir_attr;
 302         struct path path;
 303         struct dentry *dir;
 304         struct nfs4_state_owner *owner;
 305         struct nfs4_state *state;
 306         struct iattr attrs;
 307         unsigned long timestamp;
 308         unsigned int rpc_done : 1;
 309         int rpc_status;
 310         int cancelled;
 311 };
 312
 313
 314 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 315 {
 316         p->o_res.f_attr = &p->f_attr;
 317         p->o_res.dir_attr = &p->dir_attr;
 318         p->o_res.seqid = p->o_arg.seqid;
 319         p->c_res.seqid = p->c_arg.seqid;
 320         p->o_res.server = p->o_arg.server;
 321         nfs_fattr_init(&p->f_attr);
 322         nfs_fattr_init(&p->dir_attr);
 323 }
 324
 325 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 326                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 327                 const struct iattr *attrs)
 328 {
 329         struct dentry *parent = dget_parent(path->dentry);
 330         struct inode *dir = parent->d_inode;
 331         struct nfs_server *server = NFS_SERVER(dir);
 332         struct nfs4_opendata *p;
 333
 334         p = kzalloc(sizeof(*p), GFP_KERNEL);
 335         if (p == NULL)
 336                 goto err;
 337         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 338         if (p->o_arg.seqid == NULL)
 339                 goto err_free;
 340         p->path.mnt = mntget(path->mnt);
 341         p->path.dentry = dget(path->dentry);
 342         p->dir = parent;
 343         p->owner = sp;
 344         atomic_inc(&sp->so_count);
 345         p->o_arg.fh = NFS_FH(dir);
 346         p->o_arg.open_flags = flags;
 347         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 348         p->o_arg.clientid = server->nfs_client->cl_clientid;
 349         p->o_arg.id = sp->so_owner_id.id;
 350         p->o_arg.name = &p->path.dentry->d_name;
 351         p->o_arg.server = server;
 352         p->o_arg.bitmask = server->attr_bitmask;
 353         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 354         if (flags & O_EXCL) {
 355                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 356                 s[0] = jiffies;
 357                 s[1] = current->pid;
 358         } else if (flags & O_CREAT) {
 359                 p->o_arg.u.attrs = &p->attrs;
 360                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 361         }
 362         p->c_arg.fh = &p->o_res.fh;
 363         p->c_arg.stateid = &p->o_res.stateid;
 364         p->c_arg.seqid = p->o_arg.seqid;
 365         nfs4_init_opendata_res(p);
 366         kref_init(&p->kref);
 367         return p;
 368 err_free:
 369         kfree(p);
 370 err:
 371         dput(parent);
 372         return NULL;
 373 }
 374
 375 static void nfs4_opendata_free(struct kref *kref)
 376 {
 377         struct nfs4_opendata *p = container_of(kref,
 378                         struct nfs4_opendata, kref);
 379
 380         nfs_free_seqid(p->o_arg.seqid);
 381         if (p->state != NULL)
 382                 nfs4_put_open_state(p->state);
 383         nfs4_put_state_owner(p->owner);
 384         dput(p->dir);
 385         path_put(&p->path);
 386         kfree(p);
 387 }
 388
 389 static void nfs4_opendata_put(struct nfs4_opendata *p)
 390 {
 391         if (p != NULL)
 392                 kref_put(&p->kref, nfs4_opendata_free);
 393 }
 394
 395 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 396 {
 397         int ret;
 398
 399         ret = rpc_wait_for_completion_task(task);
 400         return ret;
 401 }
 402
 403 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 404 {
 405         int ret = 0;
 406
 407         if (open_mode & O_EXCL)
 408                 goto out;
 409         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 410                 case FMODE_READ:
 411                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 412                         break;
 413                 case FMODE_WRITE:
 414                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 415                         break;
 416                 case FMODE_READ|FMODE_WRITE:
 417                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 418         }
 419 out:
 420         return ret;
 421 }
 422
 423 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 424 {
 425         if ((delegation->type & fmode) != fmode)
 426                 return 0;
 427         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 428                 return 0;
 429         nfs_mark_delegation_referenced(delegation);
 430         return 1;
 431 }
 432
 433 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 434 {
 435         switch (fmode) {
 436                 case FMODE_WRITE:
 437                         state->n_wronly++;
 438                         break;
 439                 case FMODE_READ:
 440                         state->n_rdonly++;
 441                         break;
 442                 case FMODE_READ|FMODE_WRITE:
 443                         state->n_rdwr++;
 444         }
 445         nfs4_state_set_mode_locked(state, state->state | fmode);
 446 }
 447
 448 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 449 {
 450         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 451                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 452         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 453         switch (fmode) {
 454                 case FMODE_READ:
 455                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 456                         break;
 457                 case FMODE_WRITE:
 458                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 459                         break;
 460                 case FMODE_READ|FMODE_WRITE:
 461                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 462         }
 463 }
 464
 465 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 466 {
 467         write_seqlock(&state->seqlock);
 468         nfs_set_open_stateid_locked(state, stateid, fmode);
 469         write_sequnlock(&state->seqlock);
 470 }
 471
 472 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 473 {
 474         /*
 475          * Protect the call to nfs4_state_set_mode_locked and
 476          * serialise the stateid update
 477          */
 478         write_seqlock(&state->seqlock);
 479         if (deleg_stateid != NULL) {
 480                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 481                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 482         }
 483         if (open_stateid != NULL)
 484                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 485         write_sequnlock(&state->seqlock);
 486         spin_lock(&state->owner->so_lock);
 487         update_open_stateflags(state, fmode);
 488         spin_unlock(&state->owner->so_lock);
 489 }
 490
 491 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 492 {
 493         struct nfs_inode *nfsi = NFS_I(state->inode);
 494         struct nfs_delegation *deleg_cur;
 495         int ret = 0;
 496
 497         fmode &= (FMODE_READ|FMODE_WRITE);
 498
 499         rcu_read_lock();
 500         deleg_cur = rcu_dereference(nfsi->delegation);
 501         if (deleg_cur == NULL)
 502                 goto no_delegation;
 503
 504         spin_lock(&deleg_cur->lock);
 505         if (nfsi->delegation != deleg_cur ||
 506             (deleg_cur->type & fmode) != fmode)
 507                 goto no_delegation_unlock;
 508
 509         if (delegation == NULL)
 510                 delegation = &deleg_cur->stateid;
 511         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 512                 goto no_delegation_unlock;
 513
 514         nfs_mark_delegation_referenced(deleg_cur);
 515         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 516         ret = 1;
 517 no_delegation_unlock:
 518         spin_unlock(&deleg_cur->lock);
 519 no_delegation:
 520         rcu_read_unlock();
 521
 522         if (!ret && open_stateid != NULL) {
 523                 __update_open_stateid(state, open_stateid, NULL, fmode);
 524                 ret = 1;
 525         }
 526
 527         return ret;
 528 }
 529
 530
 531 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 532 {
 533         struct nfs_delegation *delegation;
 534
 535         rcu_read_lock();
 536         delegation = rcu_dereference(NFS_I(inode)->delegation);
 537         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 538                 rcu_read_unlock();
 539                 return;
 540         }
 541         rcu_read_unlock();
 542         nfs_inode_return_delegation(inode);
 543 }
 544
 545 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 546 {
 547         struct nfs4_state *state = opendata->state;
 548         struct nfs_inode *nfsi = NFS_I(state->inode);
 549         struct nfs_delegation *delegation;
 550         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 551         fmode_t fmode = opendata->o_arg.fmode;
 552         nfs4_stateid stateid;
 553         int ret = -EAGAIN;
 554
 555         for (;;) {
 556                 if (can_open_cached(state, fmode, open_mode)) {
 557                         spin_lock(&state->owner->so_lock);
 558                         if (can_open_cached(state, fmode, open_mode)) {
 559                                 update_open_stateflags(state, fmode);
 560                                 spin_unlock(&state->owner->so_lock);
 561                                 goto out_return_state;
 562                         }
 563                         spin_unlock(&state->owner->so_lock);
 564                 }
 565                 rcu_read_lock();
 566                 delegation = rcu_dereference(nfsi->delegation);
 567                 if (delegation == NULL ||
 568                     !can_open_delegated(delegation, fmode)) {
 569                         rcu_read_unlock();
 570                         break;
 571                 }
 572                 /* Save the delegation */
 573                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 574                 rcu_read_unlock();
 575                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 576                 if (ret != 0)
 577                         goto out;
 578                 ret = -EAGAIN;
 579
 580                 /* Try to update the stateid using the delegation */
 581                 if (update_open_stateid(state, NULL, &stateid, fmode))
 582                         goto out_return_state;
 583         }
 584 out:
 585         return ERR_PTR(ret);
 586 out_return_state:
 587         atomic_inc(&state->count);
 588         return state;
 589 }
 590
 591 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 592 {
 593         struct inode *inode;
 594         struct nfs4_state *state = NULL;
 595         struct nfs_delegation *delegation;
 596         int ret;
 597
 598         if (!data->rpc_done) {
 599                 state = nfs4_try_open_cached(data);
 600                 goto out;
 601         }
 602
 603         ret = -EAGAIN;
 604         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 605                 goto err;
 606         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 607         ret = PTR_ERR(inode);
 608         if (IS_ERR(inode))
 609                 goto err;
 610         ret = -ENOMEM;
 611         state = nfs4_get_open_state(inode, data->owner);
 612         if (state == NULL)
 613                 goto err_put_inode;
 614         if (data->o_res.delegation_type != 0) {
 615                 int delegation_flags = 0;
 616
 617                 rcu_read_lock();
 618                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 619                 if (delegation)
 620                         delegation_flags = delegation->flags;
 621                 rcu_read_unlock();
 622                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 623                         nfs_inode_set_delegation(state->inode,
 624                                         data->owner->so_cred,
 625                                         &data->o_res);
 626                 else
 627                         nfs_inode_reclaim_delegation(state->inode,
 628                                         data->owner->so_cred,
 629                                         &data->o_res);
 630         }
 631
 632         update_open_stateid(state, &data->o_res.stateid, NULL,
 633                         data->o_arg.fmode);
 634         iput(inode);
 635 out:
 636         return state;
 637 err_put_inode:
 638         iput(inode);
 639 err:
 640         return ERR_PTR(ret);
 641 }
 642
 643 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 644 {
 645         struct nfs_inode *nfsi = NFS_I(state->inode);
 646         struct nfs_open_context *ctx;
 647
 648         spin_lock(&state->inode->i_lock);
 649         list_for_each_entry(ctx, &nfsi->open_files, list) {
 650                 if (ctx->state != state)
 651                         continue;
 652                 get_nfs_open_context(ctx);
 653                 spin_unlock(&state->inode->i_lock);
 654                 return ctx;
 655         }
 656         spin_unlock(&state->inode->i_lock);
 657         return ERR_PTR(-ENOENT);
 658 }
 659
 660 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 661 {
 662         struct nfs4_opendata *opendata;
 663
 664         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
 665         if (opendata == NULL)
 666                 return ERR_PTR(-ENOMEM);
 667         opendata->state = state;
 668         atomic_inc(&state->count);
 669         return opendata;
 670 }
 671
 672 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
 673 {
 674         struct nfs4_state *newstate;
 675         int ret;
 676
 677         opendata->o_arg.open_flags = 0;
 678         opendata->o_arg.fmode = fmode;
 679         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 680         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 681         nfs4_init_opendata_res(opendata);
 682         ret = _nfs4_proc_open(opendata);
 683         if (ret != 0)
 684                 return ret;
 685         newstate = nfs4_opendata_to_nfs4_state(opendata);
 686         if (IS_ERR(newstate))
 687                 return PTR_ERR(newstate);
 688         nfs4_close_state(&opendata->path, newstate, fmode);
 689         *res = newstate;
 690         return 0;
 691 }
 692
 693 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 694 {
 695         struct nfs4_state *newstate;
 696         int ret;
 697
 698         /* memory barrier prior to reading state->n_* */
 699         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 700         smp_rmb();
 701         if (state->n_rdwr != 0) {
 702                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 703                 if (ret != 0)
 704                         return ret;
 705                 if (newstate != state)
 706                         return -ESTALE;
 707         }
 708         if (state->n_wronly != 0) {
 709                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 710                 if (ret != 0)
 711                         return ret;
 712                 if (newstate != state)
 713                         return -ESTALE;
 714         }
 715         if (state->n_rdonly != 0) {
 716                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 717                 if (ret != 0)
 718                         return ret;
 719                 if (newstate != state)
 720                         return -ESTALE;
 721         }
 722         /*
 723          * We may have performed cached opens for all three recoveries.
 724          * Check if we need to update the current stateid.
 725          */
 726         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 727             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 728                 write_seqlock(&state->seqlock);
 729                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 730                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 731                 write_sequnlock(&state->seqlock);
 732         }
 733         return 0;
 734 }
 735
 736 /*
 737  * OPEN_RECLAIM:
 738  *      reclaim state on the server after a reboot.
 739  */
 740 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 741 {
 742         struct nfs_delegation *delegation;
 743         struct nfs4_opendata *opendata;
 744         fmode_t delegation_type = 0;
 745         int status;
 746
 747         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 748         if (IS_ERR(opendata))
 749                 return PTR_ERR(opendata);
 750         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 751         opendata->o_arg.fh = NFS_FH(state->inode);
 752         rcu_read_lock();
 753         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 754         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
 755                 delegation_type = delegation->type;
 756         rcu_read_unlock();
 757         opendata->o_arg.u.delegation_type = delegation_type;
 758         status = nfs4_open_recover(opendata, state);
 759         nfs4_opendata_put(opendata);
 760         return status;
 761 }
 762
 763 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 764 {
 765         struct nfs_server *server = NFS_SERVER(state->inode);
 766         struct nfs4_exception exception = { };
 767         int err;
 768         do {
 769                 err = _nfs4_do_open_reclaim(ctx, state);
 770                 if (err != -NFS4ERR_DELAY)
 771                         break;
 772                 nfs4_handle_exception(server, err, &exception);
 773         } while (exception.retry);
 774         return err;
 775 }
 776
 777 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 778 {
 779         struct nfs_open_context *ctx;
 780         int ret;
 781
 782         ctx = nfs4_state_find_open_context(state);
 783         if (IS_ERR(ctx))
 784                 return PTR_ERR(ctx);
 785         ret = nfs4_do_open_reclaim(ctx, state);
 786         put_nfs_open_context(ctx);
 787         return ret;
 788 }
 789
 790 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 791 {
 792         struct nfs4_opendata *opendata;
 793         int ret;
 794
 795         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 796         if (IS_ERR(opendata))
 797                 return PTR_ERR(opendata);
 798         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 799         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 800                         sizeof(opendata->o_arg.u.delegation.data));
 801         ret = nfs4_open_recover(opendata, state);
 802         nfs4_opendata_put(opendata);
 803         return ret;
 804 }
 805
 806 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 807 {
 808         struct nfs4_exception exception = { };
 809         struct nfs_server *server = NFS_SERVER(state->inode);
 810         int err;
 811         do {
 812                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 813                 switch (err) {
 814                         case 0:
 815                                 return err;
 816                         case -NFS4ERR_STALE_CLIENTID:
 817                         case -NFS4ERR_STALE_STATEID:
 818                         case -NFS4ERR_EXPIRED:
 819                                 /* Don't recall a delegation if it was lost */
 820                                 nfs4_schedule_state_recovery(server->nfs_client);
 821                                 return err;
 822                 }
 823                 err = nfs4_handle_exception(server, err, &exception);
 824         } while (exception.retry);
 825         return err;
 826 }
 827
 828 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 829 {
 830         struct nfs4_opendata *data = calldata;
 831
 832         data->rpc_status = task->tk_status;
 833         if (RPC_ASSASSINATED(task))
 834                 return;
 835         if (data->rpc_status == 0) {
 836                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 837                                 sizeof(data->o_res.stateid.data));
 838                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 839                 renew_lease(data->o_res.server, data->timestamp);
 840                 data->rpc_done = 1;
 841         }
 842 }
 843
 844 static void nfs4_open_confirm_release(void *calldata)
 845 {
 846         struct nfs4_opendata *data = calldata;
 847         struct nfs4_state *state = NULL;
 848
 849         /* If this request hasn't been cancelled, do nothing */
 850         if (data->cancelled == 0)
 851                 goto out_free;
 852         /* In case of error, no cleanup! */
 853         if (!data->rpc_done)
 854                 goto out_free;
 855         state = nfs4_opendata_to_nfs4_state(data);
 856         if (!IS_ERR(state))
 857                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 858 out_free:
 859         nfs4_opendata_put(data);
 860 }
 861
 862 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 863         .rpc_call_done = nfs4_open_confirm_done,
 864         .rpc_release = nfs4_open_confirm_release,
 865 };
 866
 867 /*
 868  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 869  */
 870 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 871 {
 872         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 873         struct rpc_task *task;
 874         struct  rpc_message msg = {
 875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 876                 .rpc_argp = &data->c_arg,
 877                 .rpc_resp = &data->c_res,
 878                 .rpc_cred = data->owner->so_cred,
 879         };
 880         struct rpc_task_setup task_setup_data = {
 881                 .rpc_client = server->client,
 882                 .rpc_message = &msg,
 883                 .callback_ops = &nfs4_open_confirm_ops,
 884                 .callback_data = data,
 885                 .workqueue = nfsiod_workqueue,
 886                 .flags = RPC_TASK_ASYNC,
 887         };
 888         int status;
 889
 890         kref_get(&data->kref);
 891         data->rpc_done = 0;
 892         data->rpc_status = 0;
 893         data->timestamp = jiffies;
 894         task = rpc_run_task(&task_setup_data);
 895         if (IS_ERR(task))
 896                 return PTR_ERR(task);
 897         status = nfs4_wait_for_completion_rpc_task(task);
 898         if (status != 0) {
 899                 data->cancelled = 1;
 900                 smp_wmb();
 901         } else
 902                 status = data->rpc_status;
 903         rpc_put_task(task);
 904         return status;
 905 }
 906
 907 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 908 {
 909         struct nfs4_opendata *data = calldata;
 910         struct nfs4_state_owner *sp = data->owner;
 911
 912         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 913                 return;
 914         /*
 915          * Check if we still need to send an OPEN call, or if we can use
 916          * a delegation instead.
 917          */
 918         if (data->state != NULL) {
 919                 struct nfs_delegation *delegation;
 920
 921                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
 922                         goto out_no_action;
 923                 rcu_read_lock();
 924                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 925                 if (delegation != NULL &&
 926                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
 927                         rcu_read_unlock();
 928                         goto out_no_action;
 929                 }
 930                 rcu_read_unlock();
 931         }
 932         /* Update sequence id. */
 933         data->o_arg.id = sp->so_owner_id.id;
 934         data->o_arg.clientid = sp->so_client->cl_clientid;
 935         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 936                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 937                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 938         }
 939         data->timestamp = jiffies;
 940         rpc_call_start(task);
 941         return;
 942 out_no_action:
 943         task->tk_action = NULL;
 944
 945 }
 946
 947 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 948 {
 949         struct nfs4_opendata *data = calldata;
 950
 951         data->rpc_status = task->tk_status;
 952         if (RPC_ASSASSINATED(task))
 953                 return;
 954         if (task->tk_status == 0) {
 955                 switch (data->o_res.f_attr->mode & S_IFMT) {
 956                         case S_IFREG:
 957                                 break;
 958                         case S_IFLNK:
 959                                 data->rpc_status = -ELOOP;
 960                                 break;
 961                         case S_IFDIR:
 962                                 data->rpc_status = -EISDIR;
 963                                 break;
 964                         default:
 965                                 data->rpc_status = -ENOTDIR;
 966                 }
 967                 renew_lease(data->o_res.server, data->timestamp);
 968                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 969                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 970         }
 971         data->rpc_done = 1;
 972 }
 973
 974 static void nfs4_open_release(void *calldata)
 975 {
 976         struct nfs4_opendata *data = calldata;
 977         struct nfs4_state *state = NULL;
 978
 979         /* If this request hasn't been cancelled, do nothing */
 980         if (data->cancelled == 0)
 981                 goto out_free;
 982         /* In case of error, no cleanup! */
 983         if (data->rpc_status != 0 || !data->rpc_done)
 984                 goto out_free;
 985         /* In case we need an open_confirm, no cleanup! */
 986         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 987                 goto out_free;
 988         state = nfs4_opendata_to_nfs4_state(data);
 989         if (!IS_ERR(state))
 990                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 991 out_free:
 992         nfs4_opendata_put(data);
 993 }
 994
 995 static const struct rpc_call_ops nfs4_open_ops = {
 996         .rpc_call_prepare = nfs4_open_prepare,
 997         .rpc_call_done = nfs4_open_done,
 998         .rpc_release = nfs4_open_release,
 999 };
1000
1001 /*
1002  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1003  */
1004 static int _nfs4_proc_open(struct nfs4_opendata *data)
1005 {
1006         struct inode *dir = data->dir->d_inode;
1007         struct nfs_server *server = NFS_SERVER(dir);
1008         struct nfs_openargs *o_arg = &data->o_arg;
1009         struct nfs_openres *o_res = &data->o_res;
1010         struct rpc_task *task;
1011         struct rpc_message msg = {
1012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1013                 .rpc_argp = o_arg,
1014                 .rpc_resp = o_res,
1015                 .rpc_cred = data->owner->so_cred,
1016         };
1017         struct rpc_task_setup task_setup_data = {
1018                 .rpc_client = server->client,
1019                 .rpc_message = &msg,
1020                 .callback_ops = &nfs4_open_ops,
1021                 .callback_data = data,
1022                 .workqueue = nfsiod_workqueue,
1023                 .flags = RPC_TASK_ASYNC,
1024         };
1025         int status;
1026
1027         kref_get(&data->kref);
1028         data->rpc_done = 0;
1029         data->rpc_status = 0;
1030         data->cancelled = 0;
1031         task = rpc_run_task(&task_setup_data);
1032         if (IS_ERR(task))
1033                 return PTR_ERR(task);
1034         status = nfs4_wait_for_completion_rpc_task(task);
1035         if (status != 0) {
1036                 data->cancelled = 1;
1037                 smp_wmb();
1038         } else
1039                 status = data->rpc_status;
1040         rpc_put_task(task);
1041         if (status != 0 || !data->rpc_done)
1042                 return status;
1043
1044         if (o_res->fh.size == 0)
1045                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1046
1047         if (o_arg->open_flags & O_CREAT) {
1048                 update_changeattr(dir, &o_res->cinfo);
1049                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1050         } else
1051                 nfs_refresh_inode(dir, o_res->dir_attr);
1052         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1053                 status = _nfs4_proc_open_confirm(data);
1054                 if (status != 0)
1055                         return status;
1056         }
1057         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1058                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1059         return 0;
1060 }
1061
1062 static int nfs4_recover_expired_lease(struct nfs_server *server)
1063 {
1064         struct nfs_client *clp = server->nfs_client;
1065         int ret;
1066
1067         for (;;) {
1068                 ret = nfs4_wait_clnt_recover(clp);
1069                 if (ret != 0)
1070                         return ret;
1071                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1072                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1073                         break;
1074                 nfs4_schedule_state_recovery(clp);
1075         }
1076         return 0;
1077 }
1078
1079 /*
1080  * OPEN_EXPIRED:
1081  *      reclaim state on the server after a network partition.
1082  *      Assumes caller holds the appropriate lock
1083  */
1084 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1085 {
1086         struct nfs4_opendata *opendata;
1087         int ret;
1088
1089         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1090         if (IS_ERR(opendata))
1091                 return PTR_ERR(opendata);
1092         ret = nfs4_open_recover(opendata, state);
1093         if (ret == -ESTALE)
1094                 d_drop(ctx->path.dentry);
1095         nfs4_opendata_put(opendata);
1096         return ret;
1097 }
1098
1099 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1100 {
1101         struct nfs_server *server = NFS_SERVER(state->inode);
1102         struct nfs4_exception exception = { };
1103         int err;
1104
1105         do {
1106                 err = _nfs4_open_expired(ctx, state);
1107                 if (err != -NFS4ERR_DELAY)
1108                         break;
1109                 nfs4_handle_exception(server, err, &exception);
1110         } while (exception.retry);
1111         return err;
1112 }
1113
1114 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1115 {
1116         struct nfs_open_context *ctx;
1117         int ret;
1118
1119         ctx = nfs4_state_find_open_context(state);
1120         if (IS_ERR(ctx))
1121                 return PTR_ERR(ctx);
1122         ret = nfs4_do_open_expired(ctx, state);
1123         put_nfs_open_context(ctx);
1124         return ret;
1125 }
1126
1127 /*
1128  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1129  * fields corresponding to attributes that were used to store the verifier.
1130  * Make sure we clobber those fields in the later setattr call
1131  */
1132 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1133 {
1134         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1135             !(sattr->ia_valid & ATTR_ATIME_SET))
1136                 sattr->ia_valid |= ATTR_ATIME;
1137
1138         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1139             !(sattr->ia_valid & ATTR_MTIME_SET))
1140                 sattr->ia_valid |= ATTR_MTIME;
1141 }
1142
1143 /*
1144  * Returns a referenced nfs4_state
1145  */
1146 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)
1147 {
1148         struct nfs4_state_owner  *sp;
1149         struct nfs4_state     *state = NULL;
1150         struct nfs_server       *server = NFS_SERVER(dir);
1151         struct nfs4_opendata *opendata;
1152         int status;
1153
1154         /* Protect against reboot recovery conflicts */
1155         status = -ENOMEM;
1156         if (!(sp = nfs4_get_state_owner(server, cred))) {
1157                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1158                 goto out_err;
1159         }
1160         status = nfs4_recover_expired_lease(server);
1161         if (status != 0)
1162                 goto err_put_state_owner;
1163         if (path->dentry->d_inode != NULL)
1164                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1165         status = -ENOMEM;
1166         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1167         if (opendata == NULL)
1168                 goto err_put_state_owner;
1169
1170         if (path->dentry->d_inode != NULL)
1171                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1172
1173         status = _nfs4_proc_open(opendata);
1174         if (status != 0)
1175                 goto err_opendata_put;
1176
1177         if (opendata->o_arg.open_flags & O_EXCL)
1178                 nfs4_exclusive_attrset(opendata, sattr);
1179
1180         state = nfs4_opendata_to_nfs4_state(opendata);
1181         status = PTR_ERR(state);
1182         if (IS_ERR(state))
1183                 goto err_opendata_put;
1184         nfs4_opendata_put(opendata);
1185         nfs4_put_state_owner(sp);
1186         *res = state;
1187         return 0;
1188 err_opendata_put:
1189         nfs4_opendata_put(opendata);
1190 err_put_state_owner:
1191         nfs4_put_state_owner(sp);
1192 out_err:
1193         *res = NULL;
1194         return status;
1195 }
1196
1197
1198 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)
1199 {
1200         struct nfs4_exception exception = { };
1201         struct nfs4_state *res;
1202         int status;
1203
1204         do {
1205                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1206                 if (status == 0)
1207                         break;
1208                 /* NOTE: BAD_SEQID means the server and client disagree about the
1209                  * book-keeping w.r.t. state-changing operations
1210                  * (OPEN/CLOSE/LOCK/LOCKU...)
1211                  * It is actually a sign of a bug on the client or on the server.
1212                  *
1213                  * If we receive a BAD_SEQID error in the particular case of
1214                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1215                  * have unhashed the old state_owner for us, and that we can
1216                  * therefore safely retry using a new one. We should still warn
1217                  * the user though...
1218                  */
1219                 if (status == -NFS4ERR_BAD_SEQID) {
1220                         printk(KERN_WARNING "NFS: v4 server %s "
1221                                         " returned a bad sequence-id error!\n",
1222                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1223                         exception.retry = 1;
1224                         continue;
1225                 }
1226                 /*
1227                  * BAD_STATEID on OPEN means that the server cancelled our
1228                  * state before it received the OPEN_CONFIRM.
1229                  * Recover by retrying the request as per the discussion
1230                  * on Page 181 of RFC3530.
1231                  */
1232                 if (status == -NFS4ERR_BAD_STATEID) {
1233                         exception.retry = 1;
1234                         continue;
1235                 }
1236                 if (status == -EAGAIN) {
1237                         /* We must have found a delegation */
1238                         exception.retry = 1;
1239                         continue;
1240                 }
1241                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1242                                         status, &exception));
1243         } while (exception.retry);
1244         return res;
1245 }
1246
1247 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1248                             struct nfs_fattr *fattr, struct iattr *sattr,
1249                             struct nfs4_state *state)
1250 {
1251         struct nfs_server *server = NFS_SERVER(inode);
1252         struct nfs_setattrargs  arg = {
1253                 .fh             = NFS_FH(inode),
1254                 .iap            = sattr,
1255                 .server         = server,
1256                 .bitmask = server->attr_bitmask,
1257         };
1258         struct nfs_setattrres  res = {
1259                 .fattr          = fattr,
1260                 .server         = server,
1261         };
1262         struct rpc_message msg = {
1263                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1264                 .rpc_argp       = &arg,
1265                 .rpc_resp       = &res,
1266                 .rpc_cred       = cred,
1267         };
1268         unsigned long timestamp = jiffies;
1269         int status;
1270
1271         nfs_fattr_init(fattr);
1272
1273         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1274                 /* Use that stateid */
1275         } else if (state != NULL) {
1276                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1277         } else
1278                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1279
1280         status = rpc_call_sync(server->client, &msg, 0);
1281         if (status == 0 && state != NULL)
1282                 renew_lease(server, timestamp);
1283         return status;
1284 }
1285
1286 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1287                            struct nfs_fattr *fattr, struct iattr *sattr,
1288                            struct nfs4_state *state)
1289 {
1290         struct nfs_server *server = NFS_SERVER(inode);
1291         struct nfs4_exception exception = { };
1292         int err;
1293         do {
1294                 err = nfs4_handle_exception(server,
1295                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1296                                 &exception);
1297         } while (exception.retry);
1298         return err;
1299 }
1300
1301 struct nfs4_closedata {
1302         struct path path;
1303         struct inode *inode;
1304         struct nfs4_state *state;
1305         struct nfs_closeargs arg;
1306         struct nfs_closeres res;
1307         struct nfs_fattr fattr;
1308         unsigned long timestamp;
1309 };
1310
1311 static void nfs4_free_closedata(void *data)
1312 {
1313         struct nfs4_closedata *calldata = data;
1314         struct nfs4_state_owner *sp = calldata->state->owner;
1315
1316         nfs4_put_open_state(calldata->state);
1317         nfs_free_seqid(calldata->arg.seqid);
1318         nfs4_put_state_owner(sp);
1319         path_put(&calldata->path);
1320         kfree(calldata);
1321 }
1322
1323 static void nfs4_close_done(struct rpc_task *task, void *data)
1324 {
1325         struct nfs4_closedata *calldata = data;
1326         struct nfs4_state *state = calldata->state;
1327         struct nfs_server *server = NFS_SERVER(calldata->inode);
1328
1329         if (RPC_ASSASSINATED(task))
1330                 return;
1331         /* hmm. we are done with the inode, and in the process of freeing
1332          * the state_owner. we keep this around to process errors
1333          */
1334         switch (task->tk_status) {
1335                 case 0:
1336                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1337                         renew_lease(server, calldata->timestamp);
1338                         break;
1339                 case -NFS4ERR_STALE_STATEID:
1340                 case -NFS4ERR_OLD_STATEID:
1341                 case -NFS4ERR_BAD_STATEID:
1342                 case -NFS4ERR_EXPIRED:
1343                         if (calldata->arg.fmode == 0)
1344                                 break;
1345                 default:
1346                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1347                                 rpc_restart_call(task);
1348                                 return;
1349                         }
1350         }
1351         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1352 }
1353
1354 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1355 {
1356         struct nfs4_closedata *calldata = data;
1357         struct nfs4_state *state = calldata->state;
1358         int clear_rd, clear_wr, clear_rdwr;
1359
1360         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1361                 return;
1362
1363         clear_rd = clear_wr = clear_rdwr = 0;
1364         spin_lock(&state->owner->so_lock);
1365         /* Calculate the change in open mode */
1366         if (state->n_rdwr == 0) {
1367                 if (state->n_rdonly == 0) {
1368                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1369                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1370                 }
1371                 if (state->n_wronly == 0) {
1372                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1373                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1374                 }
1375         }
1376         spin_unlock(&state->owner->so_lock);
1377         if (!clear_rd && !clear_wr && !clear_rdwr) {
1378                 /* Note: exit _without_ calling nfs4_close_done */
1379                 task->tk_action = NULL;
1380                 return;
1381         }
1382         nfs_fattr_init(calldata->res.fattr);
1383         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1384                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1385                 calldata->arg.fmode = FMODE_READ;
1386         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1387                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1388                 calldata->arg.fmode = FMODE_WRITE;
1389         }
1390         calldata->timestamp = jiffies;
1391         rpc_call_start(task);
1392 }
1393
1394 static const struct rpc_call_ops nfs4_close_ops = {
1395         .rpc_call_prepare = nfs4_close_prepare,
1396         .rpc_call_done = nfs4_close_done,
1397         .rpc_release = nfs4_free_closedata,
1398 };
1399
1400 /*
1401  * It is possible for data to be read/written from a mem-mapped file
1402  * after the sys_close call (which hits the vfs layer as a flush).
1403  * This means that we can't safely call nfsv4 close on a file until
1404  * the inode is cleared. This in turn means that we are not good
1405  * NFSv4 citizens - we do not indicate to the server to update the file's
1406  * share state even when we are done with one of the three share
1407  * stateid's in the inode.
1408  *
1409  * NOTE: Caller must be holding the sp->so_owner semaphore!
1410  */
1411 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1412 {
1413         struct nfs_server *server = NFS_SERVER(state->inode);
1414         struct nfs4_closedata *calldata;
1415         struct nfs4_state_owner *sp = state->owner;
1416         struct rpc_task *task;
1417         struct rpc_message msg = {
1418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1419                 .rpc_cred = state->owner->so_cred,
1420         };
1421         struct rpc_task_setup task_setup_data = {
1422                 .rpc_client = server->client,
1423                 .rpc_message = &msg,
1424                 .callback_ops = &nfs4_close_ops,
1425                 .workqueue = nfsiod_workqueue,
1426                 .flags = RPC_TASK_ASYNC,
1427         };
1428         int status = -ENOMEM;
1429
1430         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1431         if (calldata == NULL)
1432                 goto out;
1433         calldata->inode = state->inode;
1434         calldata->state = state;
1435         calldata->arg.fh = NFS_FH(state->inode);
1436         calldata->arg.stateid = &state->open_stateid;
1437         /* Serialization for the sequence id */
1438         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1439         if (calldata->arg.seqid == NULL)
1440                 goto out_free_calldata;
1441         calldata->arg.fmode = 0;
1442         calldata->arg.bitmask = server->attr_bitmask;
1443         calldata->res.fattr = &calldata->fattr;
1444         calldata->res.seqid = calldata->arg.seqid;
1445         calldata->res.server = server;
1446         calldata->path.mnt = mntget(path->mnt);
1447         calldata->path.dentry = dget(path->dentry);
1448
1449         msg.rpc_argp = &calldata->arg,
1450         msg.rpc_resp = &calldata->res,
1451         task_setup_data.callback_data = calldata;
1452         task = rpc_run_task(&task_setup_data);
1453         if (IS_ERR(task))
1454                 return PTR_ERR(task);
1455         status = 0;
1456         if (wait)
1457                 status = rpc_wait_for_completion_task(task);
1458         rpc_put_task(task);
1459         return status;
1460 out_free_calldata:
1461         kfree(calldata);
1462 out:
1463         nfs4_put_open_state(state);
1464         nfs4_put_state_owner(sp);
1465         return status;
1466 }
1467
1468 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1469 {
1470         struct file *filp;
1471         int ret;
1472
1473         /* If the open_intent is for execute, we have an extra check to make */
1474         if (fmode & FMODE_EXEC) {
1475                 ret = nfs_may_open(state->inode,
1476                                 state->owner->so_cred,
1477                                 nd->intent.open.flags);
1478                 if (ret < 0)
1479                         goto out_close;
1480         }
1481         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1482         if (!IS_ERR(filp)) {
1483                 struct nfs_open_context *ctx;
1484                 ctx = nfs_file_open_context(filp);
1485                 ctx->state = state;
1486                 return 0;
1487         }
1488         ret = PTR_ERR(filp);
1489 out_close:
1490         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1491         return ret;
1492 }
1493
1494 struct dentry *
1495 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1496 {
1497         struct path path = {
1498                 .mnt = nd->path.mnt,
1499                 .dentry = dentry,
1500         };
1501         struct dentry *parent;
1502         struct iattr attr;
1503         struct rpc_cred *cred;
1504         struct nfs4_state *state;
1505         struct dentry *res;
1506         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1507
1508         if (nd->flags & LOOKUP_CREATE) {
1509                 attr.ia_mode = nd->intent.open.create_mode;
1510                 attr.ia_valid = ATTR_MODE;
1511                 if (!IS_POSIXACL(dir))
1512                         attr.ia_mode &= ~current->fs->umask;
1513         } else {
1514                 attr.ia_valid = 0;
1515                 BUG_ON(nd->intent.open.flags & O_CREAT);
1516         }
1517
1518         cred = rpc_lookup_cred();
1519         if (IS_ERR(cred))
1520                 return (struct dentry *)cred;
1521         parent = dentry->d_parent;
1522         /* Protect against concurrent sillydeletes */
1523         nfs_block_sillyrename(parent);
1524         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1525         put_rpccred(cred);
1526         if (IS_ERR(state)) {
1527                 if (PTR_ERR(state) == -ENOENT) {
1528                         d_add(dentry, NULL);
1529                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1530                 }
1531                 nfs_unblock_sillyrename(parent);
1532                 return (struct dentry *)state;
1533         }
1534         res = d_add_unique(dentry, igrab(state->inode));
1535         if (res != NULL)
1536                 path.dentry = res;
1537         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1538         nfs_unblock_sillyrename(parent);
1539         nfs4_intent_set_file(nd, &path, state, fmode);
1540         return res;
1541 }
1542
1543 int
1544 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1545 {
1546         struct path path = {
1547                 .mnt = nd->path.mnt,
1548                 .dentry = dentry,
1549         };
1550         struct rpc_cred *cred;
1551         struct nfs4_state *state;
1552         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1553
1554         cred = rpc_lookup_cred();
1555         if (IS_ERR(cred))
1556                 return PTR_ERR(cred);
1557         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1558         put_rpccred(cred);
1559         if (IS_ERR(state)) {
1560                 switch (PTR_ERR(state)) {
1561                         case -EPERM:
1562                         case -EACCES:
1563                         case -EDQUOT:
1564                         case -ENOSPC:
1565                         case -EROFS:
1566                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1567                                 return 1;
1568                         default:
1569                                 goto out_drop;
1570                 }
1571         }
1572         if (state->inode == dentry->d_inode) {
1573                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1574                 nfs4_intent_set_file(nd, &path, state, fmode);
1575                 return 1;
1576         }
1577         nfs4_close_sync(&path, state, fmode);
1578 out_drop:
1579         d_drop(dentry);
1580         return 0;
1581 }
1582
1583
1584 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1585 {
1586         struct nfs4_server_caps_res res = {};
1587         struct rpc_message msg = {
1588                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1589                 .rpc_argp = fhandle,
1590                 .rpc_resp = &res,
1591         };
1592         int status;
1593
1594         status = rpc_call_sync(server->client, &msg, 0);
1595         if (status == 0) {
1596                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1597                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1598                         server->caps |= NFS_CAP_ACLS;
1599                 if (res.has_links != 0)
1600                         server->caps |= NFS_CAP_HARDLINKS;
1601                 if (res.has_symlinks != 0)
1602                         server->caps |= NFS_CAP_SYMLINKS;
1603                 server->acl_bitmask = res.acl_bitmask;
1604         }
1605         return status;
1606 }
1607
1608 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1609 {
1610         struct nfs4_exception exception = { };
1611         int err;
1612         do {
1613                 err = nfs4_handle_exception(server,
1614                                 _nfs4_server_capabilities(server, fhandle),
1615                                 &exception);
1616         } while (exception.retry);
1617         return err;
1618 }
1619
1620 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1621                 struct nfs_fsinfo *info)
1622 {
1623         struct nfs4_lookup_root_arg args = {
1624                 .bitmask = nfs4_fattr_bitmap,
1625         };
1626         struct nfs4_lookup_res res = {
1627                 .server = server,
1628                 .fattr = info->fattr,
1629                 .fh = fhandle,
1630         };
1631         struct rpc_message msg = {
1632                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1633                 .rpc_argp = &args,
1634                 .rpc_resp = &res,
1635         };
1636         nfs_fattr_init(info->fattr);
1637         return rpc_call_sync(server->client, &msg, 0);
1638 }
1639
1640 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1641                 struct nfs_fsinfo *info)
1642 {
1643         struct nfs4_exception exception = { };
1644         int err;
1645         do {
1646                 err = nfs4_handle_exception(server,
1647                                 _nfs4_lookup_root(server, fhandle, info),
1648                                 &exception);
1649         } while (exception.retry);
1650         return err;
1651 }
1652
1653 /*
1654  * get the file handle for the "/" directory on the server
1655  */
1656 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1657                               struct nfs_fsinfo *info)
1658 {
1659         int status;
1660
1661         status = nfs4_lookup_root(server, fhandle, info);
1662         if (status == 0)
1663                 status = nfs4_server_capabilities(server, fhandle);
1664         if (status == 0)
1665                 status = nfs4_do_fsinfo(server, fhandle, info);
1666         return nfs4_map_errors(status);
1667 }
1668
1669 /*
1670  * Get locations and (maybe) other attributes of a referral.
1671  * Note that we'll actually follow the referral later when
1672  * we detect fsid mismatch in inode revalidation
1673  */
1674 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1675 {
1676         int status = -ENOMEM;
1677         struct page *page = NULL;
1678         struct nfs4_fs_locations *locations = NULL;
1679
1680         page = alloc_page(GFP_KERNEL);
1681         if (page == NULL)
1682                 goto out;
1683         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1684         if (locations == NULL)
1685                 goto out;
1686
1687         status = nfs4_proc_fs_locations(dir, name, locations, page);
1688         if (status != 0)
1689                 goto out;
1690         /* Make sure server returned a different fsid for the referral */
1691         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1692                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1693                 status = -EIO;
1694                 goto out;
1695         }
1696
1697         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1698         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1699         if (!fattr->mode)
1700                 fattr->mode = S_IFDIR;
1701         memset(fhandle, 0, sizeof(struct nfs_fh));
1702 out:
1703         if (page)
1704                 __free_page(page);
1705         if (locations)
1706                 kfree(locations);
1707         return status;
1708 }
1709
1710 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1711 {
1712         struct nfs4_getattr_arg args = {
1713                 .fh = fhandle,
1714                 .bitmask = server->attr_bitmask,
1715         };
1716         struct nfs4_getattr_res res = {
1717                 .fattr = fattr,
1718                 .server = server,
1719         };
1720         struct rpc_message msg = {
1721                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1722                 .rpc_argp = &args,
1723                 .rpc_resp = &res,
1724         };
1725
1726         nfs_fattr_init(fattr);
1727         return rpc_call_sync(server->client, &msg, 0);
1728 }
1729
1730 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1731 {
1732         struct nfs4_exception exception = { };
1733         int err;
1734         do {
1735                 err = nfs4_handle_exception(server,
1736                                 _nfs4_proc_getattr(server, fhandle, fattr),
1737                                 &exception);
1738         } while (exception.retry);
1739         return err;
1740 }
1741
1742 /*
1743  * The file is not closed if it is opened due to the a request to change
1744  * the size of the file. The open call will not be needed once the
1745  * VFS layer lookup-intents are implemented.
1746  *
1747  * Close is called when the inode is destroyed.
1748  * If we haven't opened the file for O_WRONLY, we
1749  * need to in the size_change case to obtain a stateid.
1750  *
1751  * Got race?
1752  * Because OPEN is always done by name in nfsv4, it is
1753  * possible that we opened a different file by the same
1754  * name.  We can recognize this race condition, but we
1755  * can't do anything about it besides returning an error.
1756  *
1757  * This will be fixed with VFS changes (lookup-intent).
1758  */
1759 static int
1760 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1761                   struct iattr *sattr)
1762 {
1763         struct inode *inode = dentry->d_inode;
1764         struct rpc_cred *cred = NULL;
1765         struct nfs4_state *state = NULL;
1766         int status;
1767
1768         nfs_fattr_init(fattr);
1769
1770         /* Search for an existing open(O_WRITE) file */
1771         if (sattr->ia_valid & ATTR_FILE) {
1772                 struct nfs_open_context *ctx;
1773
1774                 ctx = nfs_file_open_context(sattr->ia_file);
1775                 if (ctx) {
1776                         cred = ctx->cred;
1777                         state = ctx->state;
1778                 }
1779         }
1780
1781         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1782         if (status == 0)
1783                 nfs_setattr_update_inode(inode, sattr);
1784         return status;
1785 }
1786
1787 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1788                 const struct qstr *name, struct nfs_fh *fhandle,
1789                 struct nfs_fattr *fattr)
1790 {
1791         int                    status;
1792         struct nfs4_lookup_arg args = {
1793                 .bitmask = server->attr_bitmask,
1794                 .dir_fh = dirfh,
1795                 .name = name,
1796         };
1797         struct nfs4_lookup_res res = {
1798                 .server = server,
1799                 .fattr = fattr,
1800                 .fh = fhandle,
1801         };
1802         struct rpc_message msg = {
1803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1804                 .rpc_argp = &args,
1805                 .rpc_resp = &res,
1806         };
1807
1808         nfs_fattr_init(fattr);
1809
1810         dprintk("NFS call  lookupfh %s\n", name->name);
1811         status = rpc_call_sync(server->client, &msg, 0);
1812         dprintk("NFS reply lookupfh: %d\n", status);
1813         return status;
1814 }
1815
1816 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1817                               struct qstr *name, struct nfs_fh *fhandle,
1818                               struct nfs_fattr *fattr)
1819 {
1820         struct nfs4_exception exception = { };
1821         int err;
1822         do {
1823                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1824                 /* FIXME: !!!! */
1825                 if (err == -NFS4ERR_MOVED) {
1826                         err = -EREMOTE;
1827                         break;
1828                 }
1829                 err = nfs4_handle_exception(server, err, &exception);
1830         } while (exception.retry);
1831         return err;
1832 }
1833
1834 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1835                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1836 {
1837         int status;
1838
1839         dprintk("NFS call  lookup %s\n", name->name);
1840         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1841         if (status == -NFS4ERR_MOVED)
1842                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1843         dprintk("NFS reply lookup: %d\n", status);
1844         return status;
1845 }
1846
1847 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1848 {
1849         struct nfs4_exception exception = { };
1850         int err;
1851         do {
1852                 err = nfs4_handle_exception(NFS_SERVER(dir),
1853                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1854                                 &exception);
1855         } while (exception.retry);
1856         return err;
1857 }
1858
1859 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1860 {
1861         struct nfs_server *server = NFS_SERVER(inode);
1862         struct nfs_fattr fattr;
1863         struct nfs4_accessargs args = {
1864                 .fh = NFS_FH(inode),
1865                 .bitmask = server->attr_bitmask,
1866         };
1867         struct nfs4_accessres res = {
1868                 .server = server,
1869                 .fattr = &fattr,
1870         };
1871         struct rpc_message msg = {
1872                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1873                 .rpc_argp = &args,
1874                 .rpc_resp = &res,
1875                 .rpc_cred = entry->cred,
1876         };
1877         int mode = entry->mask;
1878         int status;
1879
1880         /*
1881          * Determine which access bits we want to ask for...
1882          */
1883         if (mode & MAY_READ)
1884                 args.access |= NFS4_ACCESS_READ;
1885         if (S_ISDIR(inode->i_mode)) {
1886                 if (mode & MAY_WRITE)
1887                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1888                 if (mode & MAY_EXEC)
1889                         args.access |= NFS4_ACCESS_LOOKUP;
1890         } else {
1891                 if (mode & MAY_WRITE)
1892                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1893                 if (mode & MAY_EXEC)
1894                         args.access |= NFS4_ACCESS_EXECUTE;
1895         }
1896         nfs_fattr_init(&fattr);
1897         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1898         if (!status) {
1899                 entry->mask = 0;
1900                 if (res.access & NFS4_ACCESS_READ)
1901                         entry->mask |= MAY_READ;
1902                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1903                         entry->mask |= MAY_WRITE;
1904                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1905                         entry->mask |= MAY_EXEC;
1906                 nfs_refresh_inode(inode, &fattr);
1907         }
1908         return status;
1909 }
1910
1911 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1912 {
1913         struct nfs4_exception exception = { };
1914         int err;
1915         do {
1916                 err = nfs4_handle_exception(NFS_SERVER(inode),
1917                                 _nfs4_proc_access(inode, entry),
1918                                 &exception);
1919         } while (exception.retry);
1920         return err;
1921 }
1922
1923 /*
1924  * TODO: For the time being, we don't try to get any attributes
1925  * along with any of the zero-copy operations READ, READDIR,
1926  * READLINK, WRITE.
1927  *
1928  * In the case of the first three, we want to put the GETATTR
1929  * after the read-type operation -- this is because it is hard
1930  * to predict the length of a GETATTR response in v4, and thus
1931  * align the READ data correctly.  This means that the GETATTR
1932  * may end up partially falling into the page cache, and we should
1933  * shift it into the 'tail' of the xdr_buf before processing.
1934  * To do this efficiently, we need to know the total length
1935  * of data received, which doesn't seem to be available outside
1936  * of the RPC layer.
1937  *
1938  * In the case of WRITE, we also want to put the GETATTR after
1939  * the operation -- in this case because we want to make sure
1940  * we get the post-operation mtime and size.  This means that
1941  * we can't use xdr_encode_pages() as written: we need a variant
1942  * of it which would leave room in the 'tail' iovec.
1943  *
1944  * Both of these changes to the XDR layer would in fact be quite
1945  * minor, but I decided to leave them for a subsequent patch.
1946  */
1947 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1948                 unsigned int pgbase, unsigned int pglen)
1949 {
1950         struct nfs4_readlink args = {
1951                 .fh       = NFS_FH(inode),
1952                 .pgbase   = pgbase,
1953                 .pglen    = pglen,
1954                 .pages    = &page,
1955         };
1956         struct rpc_message msg = {
1957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1958                 .rpc_argp = &args,
1959                 .rpc_resp = NULL,
1960         };
1961
1962         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1963 }
1964
1965 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1966                 unsigned int pgbase, unsigned int pglen)
1967 {
1968         struct nfs4_exception exception = { };
1969         int err;
1970         do {
1971                 err = nfs4_handle_exception(NFS_SERVER(inode),
1972                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1973                                 &exception);
1974         } while (exception.retry);
1975         return err;
1976 }
1977
1978 /*
1979  * Got race?
1980  * We will need to arrange for the VFS layer to provide an atomic open.
1981  * Until then, this create/open method is prone to inefficiency and race
1982  * conditions due to the lookup, create, and open VFS calls from sys_open()
1983  * placed on the wire.
1984  *
1985  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1986  * The file will be opened again in the subsequent VFS open call
1987  * (nfs4_proc_file_open).
1988  *
1989  * The open for read will just hang around to be used by any process that
1990  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1991  */
1992
1993 static int
1994 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1995                  int flags, struct nameidata *nd)
1996 {
1997         struct path path = {
1998                 .mnt = nd->path.mnt,
1999                 .dentry = dentry,
2000         };
2001         struct nfs4_state *state;
2002         struct rpc_cred *cred;
2003         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2004         int status = 0;
2005
2006         cred = rpc_lookup_cred();
2007         if (IS_ERR(cred)) {
2008                 status = PTR_ERR(cred);
2009                 goto out;
2010         }
2011         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2012         d_drop(dentry);
2013         if (IS_ERR(state)) {
2014                 status = PTR_ERR(state);
2015                 goto out_putcred;
2016         }
2017         d_add(dentry, igrab(state->inode));
2018         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2019         if (flags & O_EXCL) {
2020                 struct nfs_fattr fattr;
2021                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2022                 if (status == 0)
2023                         nfs_setattr_update_inode(state->inode, sattr);
2024                 nfs_post_op_update_inode(state->inode, &fattr);
2025         }
2026         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2027                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2028         else
2029                 nfs4_close_sync(&path, state, fmode);
2030 out_putcred:
2031         put_rpccred(cred);
2032 out:
2033         return status;
2034 }
2035
2036 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2037 {
2038         struct nfs_server *server = NFS_SERVER(dir);
2039         struct nfs_removeargs args = {
2040                 .fh = NFS_FH(dir),
2041                 .name.len = name->len,
2042                 .name.name = name->name,
2043                 .bitmask = server->attr_bitmask,
2044         };
2045         struct nfs_removeres res = {
2046                 .server = server,
2047         };
2048         struct rpc_message msg = {
2049                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2050                 .rpc_argp = &args,
2051                 .rpc_resp = &res,
2052         };
2053         int                     status;
2054
2055         nfs_fattr_init(&res.dir_attr);
2056         status = rpc_call_sync(server->client, &msg, 0);
2057         if (status == 0) {
2058                 update_changeattr(dir, &res.cinfo);
2059                 nfs_post_op_update_inode(dir, &res.dir_attr);
2060         }
2061         return status;
2062 }
2063
2064 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2065 {
2066         struct nfs4_exception exception = { };
2067         int err;
2068         do {
2069                 err = nfs4_handle_exception(NFS_SERVER(dir),
2070                                 _nfs4_proc_remove(dir, name),
2071                                 &exception);
2072         } while (exception.retry);
2073         return err;
2074 }
2075
2076 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2077 {
2078         struct nfs_server *server = NFS_SERVER(dir);
2079         struct nfs_removeargs *args = msg->rpc_argp;
2080         struct nfs_removeres *res = msg->rpc_resp;
2081
2082         args->bitmask = server->attr_bitmask;
2083         res->server = server;
2084         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2085 }
2086
2087 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2088 {
2089         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2090
2091         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2092                 return 0;
2093         update_changeattr(dir, &res->cinfo);
2094         nfs_post_op_update_inode(dir, &res->dir_attr);
2095         return 1;
2096 }
2097
2098 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2099                 struct inode *new_dir, struct qstr *new_name)
2100 {
2101         struct nfs_server *server = NFS_SERVER(old_dir);
2102         struct nfs4_rename_arg arg = {
2103                 .old_dir = NFS_FH(old_dir),
2104                 .new_dir = NFS_FH(new_dir),
2105                 .old_name = old_name,
2106                 .new_name = new_name,
2107                 .bitmask = server->attr_bitmask,
2108         };
2109         struct nfs_fattr old_fattr, new_fattr;
2110         struct nfs4_rename_res res = {
2111                 .server = server,
2112                 .old_fattr = &old_fattr,
2113                 .new_fattr = &new_fattr,
2114         };
2115         struct rpc_message msg = {
2116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2117                 .rpc_argp = &arg,
2118                 .rpc_resp = &res,
2119         };
2120         int                     status;
2121
2122         nfs_fattr_init(res.old_fattr);
2123         nfs_fattr_init(res.new_fattr);
2124         status = rpc_call_sync(server->client, &msg, 0);
2125
2126         if (!status) {
2127                 update_changeattr(old_dir, &res.old_cinfo);
2128                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2129                 update_changeattr(new_dir, &res.new_cinfo);
2130                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2131         }
2132         return status;
2133 }
2134
2135 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2136                 struct inode *new_dir, struct qstr *new_name)
2137 {
2138         struct nfs4_exception exception = { };
2139         int err;
2140         do {
2141                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2142                                 _nfs4_proc_rename(old_dir, old_name,
2143                                         new_dir, new_name),
2144                                 &exception);
2145         } while (exception.retry);
2146         return err;
2147 }
2148
2149 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2150 {
2151         struct nfs_server *server = NFS_SERVER(inode);
2152         struct nfs4_link_arg arg = {
2153                 .fh     = NFS_FH(inode),
2154                 .dir_fh = NFS_FH(dir),
2155                 .name   = name,
2156                 .bitmask = server->attr_bitmask,
2157         };
2158         struct nfs_fattr fattr, dir_attr;
2159         struct nfs4_link_res res = {
2160                 .server = server,
2161                 .fattr = &fattr,
2162                 .dir_attr = &dir_attr,
2163         };
2164         struct rpc_message msg = {
2165                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2166                 .rpc_argp = &arg,
2167                 .rpc_resp = &res,
2168         };
2169         int                     status;
2170
2171         nfs_fattr_init(res.fattr);
2172         nfs_fattr_init(res.dir_attr);
2173         status = rpc_call_sync(server->client, &msg, 0);
2174         if (!status) {
2175                 update_changeattr(dir, &res.cinfo);
2176                 nfs_post_op_update_inode(dir, res.dir_attr);
2177                 nfs_post_op_update_inode(inode, res.fattr);
2178         }
2179
2180         return status;
2181 }
2182
2183 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2184 {
2185         struct nfs4_exception exception = { };
2186         int err;
2187         do {
2188                 err = nfs4_handle_exception(NFS_SERVER(inode),
2189                                 _nfs4_proc_link(inode, dir, name),
2190                                 &exception);
2191         } while (exception.retry);
2192         return err;
2193 }
2194
2195 struct nfs4_createdata {
2196         struct rpc_message msg;
2197         struct nfs4_create_arg arg;
2198         struct nfs4_create_res res;
2199         struct nfs_fh fh;
2200         struct nfs_fattr fattr;
2201         struct nfs_fattr dir_fattr;
2202 };
2203
2204 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2205                 struct qstr *name, struct iattr *sattr, u32 ftype)
2206 {
2207         struct nfs4_createdata *data;
2208
2209         data = kzalloc(sizeof(*data), GFP_KERNEL);
2210         if (data != NULL) {
2211                 struct nfs_server *server = NFS_SERVER(dir);
2212
2213                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2214                 data->msg.rpc_argp = &data->arg;
2215                 data->msg.rpc_resp = &data->res;
2216                 data->arg.dir_fh = NFS_FH(dir);
2217                 data->arg.server = server;
2218                 data->arg.name = name;
2219                 data->arg.attrs = sattr;
2220                 data->arg.ftype = ftype;
2221                 data->arg.bitmask = server->attr_bitmask;
2222                 data->res.server = server;
2223                 data->res.fh = &data->fh;
2224                 data->res.fattr = &data->fattr;
2225                 data->res.dir_fattr = &data->dir_fattr;
2226                 nfs_fattr_init(data->res.fattr);
2227                 nfs_fattr_init(data->res.dir_fattr);
2228         }
2229         return data;
2230 }
2231
2232 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2233 {
2234         int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2235         if (status == 0) {
2236                 update_changeattr(dir, &data->res.dir_cinfo);
2237                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2238                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2239         }
2240         return status;
2241 }
2242
2243 static void nfs4_free_createdata(struct nfs4_createdata *data)
2244 {
2245         kfree(data);
2246 }
2247
2248 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2249                 struct page *page, unsigned int len, struct iattr *sattr)
2250 {
2251         struct nfs4_createdata *data;
2252         int status = -ENAMETOOLONG;
2253
2254         if (len > NFS4_MAXPATHLEN)
2255                 goto out;
2256
2257         status = -ENOMEM;
2258         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2259         if (data == NULL)
2260                 goto out;
2261
2262         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2263         data->arg.u.symlink.pages = &page;
2264         data->arg.u.symlink.len = len;
2265
2266         status = nfs4_do_create(dir, dentry, data);
2267
2268         nfs4_free_createdata(data);
2269 out:
2270         return status;
2271 }
2272
2273 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2274                 struct page *page, unsigned int len, struct iattr *sattr)
2275 {
2276         struct nfs4_exception exception = { };
2277         int err;
2278         do {
2279                 err = nfs4_handle_exception(NFS_SERVER(dir),
2280                                 _nfs4_proc_symlink(dir, dentry, page,
2281                                                         len, sattr),
2282                                 &exception);
2283         } while (exception.retry);
2284         return err;
2285 }
2286
2287 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2288                 struct iattr *sattr)
2289 {
2290         struct nfs4_createdata *data;
2291         int status = -ENOMEM;
2292
2293         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2294         if (data == NULL)
2295                 goto out;
2296
2297         status = nfs4_do_create(dir, dentry, data);
2298
2299         nfs4_free_createdata(data);
2300 out:
2301         return status;
2302 }
2303
2304 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2305                 struct iattr *sattr)
2306 {
2307         struct nfs4_exception exception = { };
2308         int err;
2309         do {
2310                 err = nfs4_handle_exception(NFS_SERVER(dir),
2311                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2312                                 &exception);
2313         } while (exception.retry);
2314         return err;
2315 }
2316
2317 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2318                   u64 cookie, struct page *page, unsigned int count, int plus)
2319 {
2320         struct inode            *dir = dentry->d_inode;
2321         struct nfs4_readdir_arg args = {
2322                 .fh = NFS_FH(dir),
2323                 .pages = &page,
2324                 .pgbase = 0,
2325                 .count = count,
2326                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2327         };
2328         struct nfs4_readdir_res res;
2329         struct rpc_message msg = {
2330                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2331                 .rpc_argp = &args,
2332                 .rpc_resp = &res,
2333                 .rpc_cred = cred,
2334         };
2335         int                     status;
2336
2337         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2338                         dentry->d_parent->d_name.name,
2339                         dentry->d_name.name,
2340                         (unsigned long long)cookie);
2341         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2342         res.pgbase = args.pgbase;
2343         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2344         if (status == 0)
2345                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2346
2347         nfs_invalidate_atime(dir);
2348
2349         dprintk("%s: returns %d\n", __func__, status);
2350         return status;
2351 }
2352
2353 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2354                   u64 cookie, struct page *page, unsigned int count, int plus)
2355 {
2356         struct nfs4_exception exception = { };
2357         int err;
2358         do {
2359                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2360                                 _nfs4_proc_readdir(dentry, cred, cookie,
2361                                         page, count, plus),
2362                                 &exception);
2363         } while (exception.retry);
2364         return err;
2365 }
2366
2367 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2368                 struct iattr *sattr, dev_t rdev)
2369 {
2370         struct nfs4_createdata *data;
2371         int mode = sattr->ia_mode;
2372         int status = -ENOMEM;
2373
2374         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2375         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2376
2377         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2378         if (data == NULL)
2379                 goto out;
2380
2381         if (S_ISFIFO(mode))
2382                 data->arg.ftype = NF4FIFO;
2383         else if (S_ISBLK(mode)) {
2384                 data->arg.ftype = NF4BLK;
2385                 data->arg.u.device.specdata1 = MAJOR(rdev);
2386                 data->arg.u.device.specdata2 = MINOR(rdev);
2387         }
2388         else if (S_ISCHR(mode)) {
2389                 data->arg.ftype = NF4CHR;
2390                 data->arg.u.device.specdata1 = MAJOR(rdev);
2391                 data->arg.u.device.specdata2 = MINOR(rdev);
2392         }
2393
2394         status = nfs4_do_create(dir, dentry, data);
2395
2396         nfs4_free_createdata(data);
2397 out:
2398         return status;
2399 }
2400
2401 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2402                 struct iattr *sattr, dev_t rdev)
2403 {
2404         struct nfs4_exception exception = { };
2405         int err;
2406         do {
2407                 err = nfs4_handle_exception(NFS_SERVER(dir),
2408                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2409                                 &exception);
2410         } while (exception.retry);
2411         return err;
2412 }
2413
2414 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2415                  struct nfs_fsstat *fsstat)
2416 {
2417         struct nfs4_statfs_arg args = {
2418                 .fh = fhandle,
2419                 .bitmask = server->attr_bitmask,
2420         };
2421         struct rpc_message msg = {
2422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2423                 .rpc_argp = &args,
2424                 .rpc_resp = fsstat,
2425         };
2426
2427         nfs_fattr_init(fsstat->fattr);
2428         return rpc_call_sync(server->client, &msg, 0);
2429 }
2430
2431 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2432 {
2433         struct nfs4_exception exception = { };
2434         int err;
2435         do {
2436                 err = nfs4_handle_exception(server,
2437                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2438                                 &exception);
2439         } while (exception.retry);
2440         return err;
2441 }
2442
2443 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2444                 struct nfs_fsinfo *fsinfo)
2445 {
2446         struct nfs4_fsinfo_arg args = {
2447                 .fh = fhandle,
2448                 .bitmask = server->attr_bitmask,
2449         };
2450         struct rpc_message msg = {
2451                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2452                 .rpc_argp = &args,
2453                 .rpc_resp = fsinfo,
2454         };
2455
2456         return rpc_call_sync(server->client, &msg, 0);
2457 }
2458
2459 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2460 {
2461         struct nfs4_exception exception = { };
2462         int err;
2463
2464         do {
2465                 err = nfs4_handle_exception(server,
2466                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2467                                 &exception);
2468         } while (exception.retry);
2469         return err;
2470 }
2471
2472 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2473 {
2474         nfs_fattr_init(fsinfo->fattr);
2475         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2476 }
2477
2478 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2479                 struct nfs_pathconf *pathconf)
2480 {
2481         struct nfs4_pathconf_arg args = {
2482                 .fh = fhandle,
2483                 .bitmask = server->attr_bitmask,
2484         };
2485         struct rpc_message msg = {
2486                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2487                 .rpc_argp = &args,
2488                 .rpc_resp = pathconf,
2489         };
2490
2491         /* None of the pathconf attributes are mandatory to implement */
2492         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2493                 memset(pathconf, 0, sizeof(*pathconf));
2494                 return 0;
2495         }
2496
2497         nfs_fattr_init(pathconf->fattr);
2498         return rpc_call_sync(server->client, &msg, 0);
2499 }
2500
2501 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2502                 struct nfs_pathconf *pathconf)
2503 {
2504         struct nfs4_exception exception = { };
2505         int err;
2506
2507         do {
2508                 err = nfs4_handle_exception(server,
2509                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2510                                 &exception);
2511         } while (exception.retry);
2512         return err;
2513 }
2514
2515 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2516 {
2517         struct nfs_server *server = NFS_SERVER(data->inode);
2518
2519         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2520                 rpc_restart_call(task);
2521                 return -EAGAIN;
2522         }
2523
2524         nfs_invalidate_atime(data->inode);
2525         if (task->tk_status > 0)
2526                 renew_lease(server, data->timestamp);
2527         return 0;
2528 }
2529
2530 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2531 {
2532         data->timestamp   = jiffies;
2533         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2534 }
2535
2536 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2537 {
2538         struct inode *inode = data->inode;
2539
2540         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2541                 rpc_restart_call(task);
2542                 return -EAGAIN;
2543         }
2544         if (task->tk_status >= 0) {
2545                 renew_lease(NFS_SERVER(inode), data->timestamp);
2546                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2547         }
2548         return 0;
2549 }
2550
2551 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2552 {
2553         struct nfs_server *server = NFS_SERVER(data->inode);
2554
2555         data->args.bitmask = server->attr_bitmask;
2556         data->res.server = server;
2557         data->timestamp   = jiffies;
2558
2559         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2560 }
2561
2562 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2563 {
2564         struct inode *inode = data->inode;
2565
2566         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2567                 rpc_restart_call(task);
2568                 return -EAGAIN;
2569         }
2570         nfs_refresh_inode(inode, data->res.fattr);
2571         return 0;
2572 }
2573
2574 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2575 {
2576         struct nfs_server *server = NFS_SERVER(data->inode);
2577
2578         data->args.bitmask = server->attr_bitmask;
2579         data->res.server = server;
2580         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2581 }
2582
2583 /*
2584  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2585  * standalone procedure for queueing an asynchronous RENEW.
2586  */
2587 static void nfs4_renew_done(struct rpc_task *task, void *data)
2588 {
2589         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2590         unsigned long timestamp = (unsigned long)data;
2591
2592         if (task->tk_status < 0) {
2593                 switch (task->tk_status) {
2594                         case -NFS4ERR_STALE_CLIENTID:
2595                         case -NFS4ERR_EXPIRED:
2596                         case -NFS4ERR_CB_PATH_DOWN:
2597                                 nfs4_schedule_state_recovery(clp);
2598                 }
2599                 return;
2600         }
2601         spin_lock(&clp->cl_lock);
2602         if (time_before(clp->cl_last_renewal,timestamp))
2603                 clp->cl_last_renewal = timestamp;
2604         spin_unlock(&clp->cl_lock);
2605 }
2606
2607 static const struct rpc_call_ops nfs4_renew_ops = {
2608         .rpc_call_done = nfs4_renew_done,
2609 };
2610
2611 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2612 {
2613         struct rpc_message msg = {
2614                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2615                 .rpc_argp       = clp,
2616                 .rpc_cred       = cred,
2617         };
2618
2619         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2620                         &nfs4_renew_ops, (void *)jiffies);
2621 }
2622
2623 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2624 {
2625         struct rpc_message msg = {
2626                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2627                 .rpc_argp       = clp,
2628                 .rpc_cred       = cred,
2629         };
2630         unsigned long now = jiffies;
2631         int status;
2632
2633         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2634         if (status < 0)
2635                 return status;
2636         spin_lock(&clp->cl_lock);
2637         if (time_before(clp->cl_last_renewal,now))
2638                 clp->cl_last_renewal = now;
2639         spin_unlock(&clp->cl_lock);
2640         return 0;
2641 }
2642
2643 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2644 {
2645         return (server->caps & NFS_CAP_ACLS)
2646                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2647                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2648 }
2649
2650 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2651  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2652  * the stack.
2653  */
2654 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2655
2656 static void buf_to_pages(const void *buf, size_t buflen,
2657                 struct page **pages, unsigned int *pgbase)
2658 {
2659         const void *p = buf;
2660
2661         *pgbase = offset_in_page(buf);
2662         p -= *pgbase;
2663         while (p < buf + buflen) {
2664                 *(pages++) = virt_to_page(p);
2665                 p += PAGE_CACHE_SIZE;
2666         }
2667 }
2668
2669 struct nfs4_cached_acl {
2670         int cached;
2671         size_t len;
2672         char data[0];
2673 };
2674
2675 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2676 {
2677         struct nfs_inode *nfsi = NFS_I(inode);
2678
2679         spin_lock(&inode->i_lock);
2680         kfree(nfsi->nfs4_acl);
2681         nfsi->nfs4_acl = acl;
2682         spin_unlock(&inode->i_lock);
2683 }
2684
2685 static void nfs4_zap_acl_attr(struct inode *inode)
2686 {
2687         nfs4_set_cached_acl(inode, NULL);
2688 }
2689
2690 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2691 {
2692         struct nfs_inode *nfsi = NFS_I(inode);
2693         struct nfs4_cached_acl *acl;
2694         int ret = -ENOENT;
2695
2696         spin_lock(&inode->i_lock);
2697         acl = nfsi->nfs4_acl;
2698         if (acl == NULL)
2699                 goto out;
2700         if (buf == NULL) /* user is just asking for length */
2701                 goto out_len;
2702         if (acl->cached == 0)
2703                 goto out;
2704         ret = -ERANGE; /* see getxattr(2) man page */
2705         if (acl->len > buflen)
2706                 goto out;
2707         memcpy(buf, acl->data, acl->len);
2708 out_len:
2709         ret = acl->len;
2710 out:
2711         spin_unlock(&inode->i_lock);
2712         return ret;
2713 }
2714
2715 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2716 {
2717         struct nfs4_cached_acl *acl;
2718
2719         if (buf && acl_len <= PAGE_SIZE) {
2720                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2721                 if (acl == NULL)
2722                         goto out;
2723                 acl->cached = 1;
2724                 memcpy(acl->data, buf, acl_len);
2725         } else {
2726                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2727                 if (acl == NULL)
2728                         goto out;
2729                 acl->cached = 0;
2730         }
2731         acl->len = acl_len;
2732 out:
2733         nfs4_set_cached_acl(inode, acl);
2734 }
2735
2736 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2737 {
2738         struct page *pages[NFS4ACL_MAXPAGES];
2739         struct nfs_getaclargs args = {
2740                 .fh = NFS_FH(inode),
2741                 .acl_pages = pages,
2742                 .acl_len = buflen,
2743         };
2744         size_t resp_len = buflen;
2745         void *resp_buf;
2746         struct rpc_message msg = {
2747                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2748                 .rpc_argp = &args,
2749                 .rpc_resp = &resp_len,
2750         };
2751         struct page *localpage = NULL;
2752         int ret;
2753
2754         if (buflen < PAGE_SIZE) {
2755                 /* As long as we're doing a round trip to the server anyway,
2756                  * let's be prepared for a page of acl data. */
2757                 localpage = alloc_page(GFP_KERNEL);
2758                 resp_buf = page_address(localpage);
2759                 if (localpage == NULL)
2760                         return -ENOMEM;
2761                 args.acl_pages[0] = localpage;
2762                 args.acl_pgbase = 0;
2763                 resp_len = args.acl_len = PAGE_SIZE;
2764         } else {
2765                 resp_buf = buf;
2766                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2767         }
2768         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2769         if (ret)
2770                 goto out_free;
2771         if (resp_len > args.acl_len)
2772                 nfs4_write_cached_acl(inode, NULL, resp_len);
2773         else
2774                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2775         if (buf) {
2776                 ret = -ERANGE;
2777                 if (resp_len > buflen)
2778                         goto out_free;
2779                 if (localpage)
2780                         memcpy(buf, resp_buf, resp_len);
2781         }
2782         ret = resp_len;
2783 out_free:
2784         if (localpage)
2785                 __free_page(localpage);
2786         return ret;
2787 }
2788
2789 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2790 {
2791         struct nfs4_exception exception = { };
2792         ssize_t ret;
2793         do {
2794                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2795                 if (ret >= 0)
2796                         break;
2797                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2798         } while (exception.retry);
2799         return ret;
2800 }
2801
2802 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2803 {
2804         struct nfs_server *server = NFS_SERVER(inode);
2805         int ret;
2806
2807         if (!nfs4_server_supports_acls(server))
2808                 return -EOPNOTSUPP;
2809         ret = nfs_revalidate_inode(server, inode);
2810         if (ret < 0)
2811                 return ret;
2812         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2813                 nfs_zap_acl_cache(inode);
2814         ret = nfs4_read_cached_acl(inode, buf, buflen);
2815         if (ret != -ENOENT)
2816                 return ret;
2817         return nfs4_get_acl_uncached(inode, buf, buflen);
2818 }
2819
2820 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2821 {
2822         struct nfs_server *server = NFS_SERVER(inode);
2823         struct page *pages[NFS4ACL_MAXPAGES];
2824         struct nfs_setaclargs arg = {
2825                 .fh             = NFS_FH(inode),
2826                 .acl_pages      = pages,
2827                 .acl_len        = buflen,
2828         };
2829         struct rpc_message msg = {
2830                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2831                 .rpc_argp       = &arg,
2832                 .rpc_resp       = NULL,
2833         };
2834         int ret;
2835
2836         if (!nfs4_server_supports_acls(server))
2837                 return -EOPNOTSUPP;
2838         nfs_inode_return_delegation(inode);
2839         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2840         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2841         nfs_access_zap_cache(inode);
2842         nfs_zap_acl_cache(inode);
2843         return ret;
2844 }
2845
2846 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2847 {
2848         struct nfs4_exception exception = { };
2849         int err;
2850         do {
2851                 err = nfs4_handle_exception(NFS_SERVER(inode),
2852                                 __nfs4_proc_set_acl(inode, buf, buflen),
2853                                 &exception);
2854         } while (exception.retry);
2855         return err;
2856 }
2857
2858 static int
2859 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
2860 {
2861         struct nfs_client *clp = server->nfs_client;
2862
2863         if (!clp || task->tk_status >= 0)
2864                 return 0;
2865         switch(task->tk_status) {
2866                 case -NFS4ERR_ADMIN_REVOKED:
2867                 case -NFS4ERR_BAD_STATEID:
2868                 case -NFS4ERR_OPENMODE:
2869                         if (state == NULL)
2870                                 break;
2871                         nfs4_state_mark_reclaim_nograce(clp, state);
2872                 case -NFS4ERR_STALE_CLIENTID:
2873                 case -NFS4ERR_STALE_STATEID:
2874                 case -NFS4ERR_EXPIRED:
2875                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2876                         nfs4_schedule_state_recovery(clp);
2877                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
2878                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2879                         task->tk_status = 0;
2880                         return -EAGAIN;
2881                 case -NFS4ERR_DELAY:
2882                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2883                 case -NFS4ERR_GRACE:
2884                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2885                         task->tk_status = 0;
2886                         return -EAGAIN;
2887                 case -NFS4ERR_OLD_STATEID:
2888                         task->tk_status = 0;
2889                         return -EAGAIN;
2890         }
2891         task->tk_status = nfs4_map_errors(task->tk_status);
2892         return 0;
2893 }
2894
2895 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2896 {
2897         nfs4_verifier sc_verifier;
2898         struct nfs4_setclientid setclientid = {
2899                 .sc_verifier = &sc_verifier,
2900                 .sc_prog = program,
2901         };
2902         struct rpc_message msg = {
2903                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2904                 .rpc_argp = &setclientid,
2905                 .rpc_resp = clp,
2906                 .rpc_cred = cred,
2907         };
2908         __be32 *p;
2909         int loop = 0;
2910         int status;
2911
2912         p = (__be32*)sc_verifier.data;
2913         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2914         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2915
2916         for(;;) {
2917                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2918                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2919                                 clp->cl_ipaddr,
2920                                 rpc_peeraddr2str(clp->cl_rpcclient,
2921                                                         RPC_DISPLAY_ADDR),
2922                                 rpc_peeraddr2str(clp->cl_rpcclient,
2923                                                         RPC_DISPLAY_PROTO),
2924                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2925                                 clp->cl_id_uniquifier);
2926                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2927                                 sizeof(setclientid.sc_netid),
2928                                 rpc_peeraddr2str(clp->cl_rpcclient,
2929                                                         RPC_DISPLAY_NETID));
2930                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2931                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2932                                 clp->cl_ipaddr, port >> 8, port & 255);
2933
2934                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2935                 if (status != -NFS4ERR_CLID_INUSE)
2936                         break;
2937                 if (signalled())
2938                         break;
2939                 if (loop++ & 1)
2940                         ssleep(clp->cl_lease_time + 1);
2941                 else
2942                         if (++clp->cl_id_uniquifier == 0)
2943                                 break;
2944         }
2945         return status;
2946 }
2947
2948 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2949 {
2950         struct nfs_fsinfo fsinfo;
2951         struct rpc_message msg = {
2952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2953                 .rpc_argp = clp,
2954                 .rpc_resp = &fsinfo,
2955                 .rpc_cred = cred,
2956         };
2957         unsigned long now;
2958         int status;
2959
2960         now = jiffies;
2961         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2962         if (status == 0) {
2963                 spin_lock(&clp->cl_lock);
2964                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2965                 clp->cl_last_renewal = now;
2966                 spin_unlock(&clp->cl_lock);
2967         }
2968         return status;
2969 }
2970
2971 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2972 {
2973         long timeout = 0;
2974         int err;
2975         do {
2976                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2977                 switch (err) {
2978                         case 0:
2979                                 return err;
2980                         case -NFS4ERR_RESOURCE:
2981                                 /* The IBM lawyers misread another document! */
2982                         case -NFS4ERR_DELAY:
2983                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2984                 }
2985         } while (err == 0);
2986         return err;
2987 }
2988
2989 struct nfs4_delegreturndata {
2990         struct nfs4_delegreturnargs args;
2991         struct nfs4_delegreturnres res;
2992         struct nfs_fh fh;
2993         nfs4_stateid stateid;
2994         unsigned long timestamp;
2995         struct nfs_fattr fattr;
2996         int rpc_status;
2997 };
2998
2999 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3000 {
3001         struct nfs4_delegreturndata *data = calldata;
3002         data->rpc_status = task->tk_status;
3003         if (data->rpc_status == 0)
3004                 renew_lease(data->res.server, data->timestamp);
3005 }
3006
3007 static void nfs4_delegreturn_release(void *calldata)
3008 {
3009         kfree(calldata);
3010 }
3011
3012 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3013         .rpc_call_done = nfs4_delegreturn_done,
3014         .rpc_release = nfs4_delegreturn_release,
3015 };
3016
3017 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3018 {
3019         struct nfs4_delegreturndata *data;
3020         struct nfs_server *server = NFS_SERVER(inode);
3021         struct rpc_task *task;
3022         struct rpc_message msg = {
3023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3024                 .rpc_cred = cred,
3025         };
3026         struct rpc_task_setup task_setup_data = {
3027                 .rpc_client = server->client,
3028                 .rpc_message = &msg,
3029                 .callback_ops = &nfs4_delegreturn_ops,
3030                 .flags = RPC_TASK_ASYNC,
3031         };
3032         int status = 0;
3033
3034         data = kmalloc(sizeof(*data), GFP_KERNEL);
3035         if (data == NULL)
3036                 return -ENOMEM;
3037         data->args.fhandle = &data->fh;
3038         data->args.stateid = &data->stateid;
3039         data->args.bitmask = server->attr_bitmask;
3040         nfs_copy_fh(&data->fh, NFS_FH(inode));
3041         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3042         data->res.fattr = &data->fattr;
3043         data->res.server = server;
3044         nfs_fattr_init(data->res.fattr);
3045         data->timestamp = jiffies;
3046         data->rpc_status = 0;
3047
3048         task_setup_data.callback_data = data;
3049         msg.rpc_argp = &data->args,
3050         msg.rpc_resp = &data->res,
3051         task = rpc_run_task(&task_setup_data);
3052         if (IS_ERR(task))
3053                 return PTR_ERR(task);
3054         if (!issync)
3055                 goto out;
3056         status = nfs4_wait_for_completion_rpc_task(task);
3057         if (status != 0)
3058                 goto out;
3059         status = data->rpc_status;
3060         if (status != 0)
3061                 goto out;
3062         nfs_refresh_inode(inode, &data->fattr);
3063 out:
3064         rpc_put_task(task);
3065         return status;
3066 }
3067
3068 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3069 {
3070         struct nfs_server *server = NFS_SERVER(inode);
3071         struct nfs4_exception exception = { };
3072         int err;
3073         do {
3074                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3075                 switch (err) {
3076                         case -NFS4ERR_STALE_STATEID:
3077                         case -NFS4ERR_EXPIRED:
3078                         case 0:
3079                                 return 0;
3080                 }
3081                 err = nfs4_handle_exception(server, err, &exception);
3082         } while (exception.retry);
3083         return err;
3084 }
3085
3086 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3087 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3088
3089 /*
3090  * sleep, with exponential backoff, and retry the LOCK operation.
3091  */
3092 static unsigned long
3093 nfs4_set_lock_task_retry(unsigned long timeout)
3094 {
3095         schedule_timeout_killable(timeout);
3096         timeout <<= 1;
3097         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3098                 return NFS4_LOCK_MAXTIMEOUT;
3099         return timeout;
3100 }
3101
3102 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3103 {
3104         struct inode *inode = state->inode;
3105         struct nfs_server *server = NFS_SERVER(inode);
3106         struct nfs_client *clp = server->nfs_client;
3107         struct nfs_lockt_args arg = {
3108                 .fh = NFS_FH(inode),
3109                 .fl = request,
3110         };
3111         struct nfs_lockt_res res = {
3112                 .denied = request,
3113         };
3114         struct rpc_message msg = {
3115                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3116                 .rpc_argp       = &arg,
3117                 .rpc_resp       = &res,
3118                 .rpc_cred       = state->owner->so_cred,
3119         };
3120         struct nfs4_lock_state *lsp;
3121         int status;
3122
3123         arg.lock_owner.clientid = clp->cl_clientid;
3124         status = nfs4_set_lock_state(state, request);
3125         if (status != 0)
3126                 goto out;
3127         lsp = request->fl_u.nfs4_fl.owner;
3128         arg.lock_owner.id = lsp->ls_id.id;
3129         status = rpc_call_sync(server->client, &msg, 0);
3130         switch (status) {
3131                 case 0:
3132                         request->fl_type = F_UNLCK;
3133                         break;
3134                 case -NFS4ERR_DENIED:
3135                         status = 0;
3136         }
3137         request->fl_ops->fl_release_private(request);
3138 out:
3139         return status;
3140 }
3141
3142 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3143 {
3144         struct nfs4_exception exception = { };
3145         int err;
3146
3147         do {
3148                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3149                                 _nfs4_proc_getlk(state, cmd, request),
3150                                 &exception);
3151         } while (exception.retry);
3152         return err;
3153 }
3154
3155 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3156 {
3157         int res = 0;
3158         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3159                 case FL_POSIX:
3160                         res = posix_lock_file_wait(file, fl);
3161                         break;
3162                 case FL_FLOCK:
3163                         res = flock_lock_file_wait(file, fl);
3164                         break;
3165                 default:
3166                         BUG();
3167         }
3168         return res;
3169 }
3170
3171 struct nfs4_unlockdata {
3172         struct nfs_locku_args arg;
3173         struct nfs_locku_res res;
3174         struct nfs4_lock_state *lsp;
3175         struct nfs_open_context *ctx;
3176         struct file_lock fl;
3177         const struct nfs_server *server;
3178         unsigned long timestamp;
3179 };
3180
3181 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3182                 struct nfs_open_context *ctx,
3183                 struct nfs4_lock_state *lsp,
3184                 struct nfs_seqid *seqid)
3185 {
3186         struct nfs4_unlockdata *p;
3187         struct inode *inode = lsp->ls_state->inode;
3188
3189         p = kmalloc(sizeof(*p), GFP_KERNEL);
3190         if (p == NULL)
3191                 return NULL;
3192         p->arg.fh = NFS_FH(inode);
3193         p->arg.fl = &p->fl;
3194         p->arg.seqid = seqid;
3195         p->res.seqid = seqid;
3196         p->arg.stateid = &lsp->ls_stateid;
3197         p->lsp = lsp;
3198         atomic_inc(&lsp->ls_count);
3199         /* Ensure we don't close file until we're done freeing locks! */
3200         p->ctx = get_nfs_open_context(ctx);
3201         memcpy(&p->fl, fl, sizeof(p->fl));
3202         p->server = NFS_SERVER(inode);
3203         return p;
3204 }
3205
3206 static void nfs4_locku_release_calldata(void *data)
3207 {
3208         struct nfs4_unlockdata *calldata = data;
3209         nfs_free_seqid(calldata->arg.seqid);
3210         nfs4_put_lock_state(calldata->lsp);
3211         put_nfs_open_context(calldata->ctx);
3212         kfree(calldata);
3213 }
3214
3215 static void nfs4_locku_done(struct rpc_task *task, void *data)
3216 {
3217         struct nfs4_unlockdata *calldata = data;
3218
3219         if (RPC_ASSASSINATED(task))
3220                 return;
3221         switch (task->tk_status) {
3222                 case 0:
3223                         memcpy(calldata->lsp->ls_stateid.data,
3224                                         calldata->res.stateid.data,
3225                                         sizeof(calldata->lsp->ls_stateid.data));
3226                         renew_lease(calldata->server, calldata->timestamp);
3227                         break;
3228                 case -NFS4ERR_BAD_STATEID:
3229                 case -NFS4ERR_OLD_STATEID:
3230                 case -NFS4ERR_STALE_STATEID:
3231                 case -NFS4ERR_EXPIRED:
3232                         break;
3233                 default:
3234                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3235                                 rpc_restart_call(task);
3236         }
3237 }
3238
3239 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3240 {
3241         struct nfs4_unlockdata *calldata = data;
3242
3243         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3244                 return;
3245         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3246                 /* Note: exit _without_ running nfs4_locku_done */
3247                 task->tk_action = NULL;
3248                 return;
3249         }
3250         calldata->timestamp = jiffies;
3251         rpc_call_start(task);
3252 }
3253
3254 static const struct rpc_call_ops nfs4_locku_ops = {
3255         .rpc_call_prepare = nfs4_locku_prepare,
3256         .rpc_call_done = nfs4_locku_done,
3257         .rpc_release = nfs4_locku_release_calldata,
3258 };
3259
3260 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3261                 struct nfs_open_context *ctx,
3262                 struct nfs4_lock_state *lsp,
3263                 struct nfs_seqid *seqid)
3264 {
3265         struct nfs4_unlockdata *data;
3266         struct rpc_message msg = {
3267                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3268                 .rpc_cred = ctx->cred,
3269         };
3270         struct rpc_task_setup task_setup_data = {
3271                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3272                 .rpc_message = &msg,
3273                 .callback_ops = &nfs4_locku_ops,
3274                 .workqueue = nfsiod_workqueue,
3275                 .flags = RPC_TASK_ASYNC,
3276         };
3277
3278         /* Ensure this is an unlock - when canceling a lock, the
3279          * canceled lock is passed in, and it won't be an unlock.
3280          */
3281         fl->fl_type = F_UNLCK;
3282
3283         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3284         if (data == NULL) {
3285                 nfs_free_seqid(seqid);
3286                 return ERR_PTR(-ENOMEM);
3287         }
3288
3289         msg.rpc_argp = &data->arg,
3290         msg.rpc_resp = &data->res,
3291         task_setup_data.callback_data = data;
3292         return rpc_run_task(&task_setup_data);
3293 }
3294
3295 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3296 {
3297         struct nfs_inode *nfsi = NFS_I(state->inode);
3298         struct nfs_seqid *seqid;
3299         struct nfs4_lock_state *lsp;
3300         struct rpc_task *task;
3301         int status = 0;
3302         unsigned char fl_flags = request->fl_flags;
3303
3304         status = nfs4_set_lock_state(state, request);
3305         /* Unlock _before_ we do the RPC call */
3306         request->fl_flags |= FL_EXISTS;
3307         down_read(&nfsi->rwsem);
3308         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3309                 up_read(&nfsi->rwsem);
3310                 goto out;
3311         }
3312         up_read(&nfsi->rwsem);
3313         if (status != 0)
3314                 goto out;
3315         /* Is this a delegated lock? */
3316         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3317                 goto out;
3318         lsp = request->fl_u.nfs4_fl.owner;
3319         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3320         status = -ENOMEM;
3321         if (seqid == NULL)
3322                 goto out;
3323         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3324         status = PTR_ERR(task);
3325         if (IS_ERR(task))
3326                 goto out;
3327         status = nfs4_wait_for_completion_rpc_task(task);
3328         rpc_put_task(task);
3329 out:
3330         request->fl_flags = fl_flags;
3331         return status;
3332 }
3333
3334 struct nfs4_lockdata {
3335         struct nfs_lock_args arg;
3336         struct nfs_lock_res res;
3337         struct nfs4_lock_state *lsp;
3338         struct nfs_open_context *ctx;
3339         struct file_lock fl;
3340         unsigned long timestamp;
3341         int rpc_status;
3342         int cancelled;
3343 };
3344
3345 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3346                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3347 {
3348         struct nfs4_lockdata *p;
3349         struct inode *inode = lsp->ls_state->inode;
3350         struct nfs_server *server = NFS_SERVER(inode);
3351
3352         p = kzalloc(sizeof(*p), GFP_KERNEL);
3353         if (p == NULL)
3354                 return NULL;
3355
3356         p->arg.fh = NFS_FH(inode);
3357         p->arg.fl = &p->fl;
3358         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3359         if (p->arg.open_seqid == NULL)
3360                 goto out_free;
3361         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3362         if (p->arg.lock_seqid == NULL)
3363                 goto out_free_seqid;
3364         p->arg.lock_stateid = &lsp->ls_stateid;
3365         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3366         p->arg.lock_owner.id = lsp->ls_id.id;
3367         p->res.lock_seqid = p->arg.lock_seqid;
3368         p->lsp = lsp;
3369         atomic_inc(&lsp->ls_count);
3370         p->ctx = get_nfs_open_context(ctx);
3371         memcpy(&p->fl, fl, sizeof(p->fl));
3372         return p;
3373 out_free_seqid:
3374         nfs_free_seqid(p->arg.open_seqid);
3375 out_free:
3376         kfree(p);
3377         return NULL;
3378 }
3379
3380 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3381 {
3382         struct nfs4_lockdata *data = calldata;
3383         struct nfs4_state *state = data->lsp->ls_state;
3384
3385         dprintk("%s: begin!\n", __func__);
3386         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3387                 return;
3388         /* Do we need to do an open_to_lock_owner? */
3389         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3390                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3391                         return;
3392                 data->arg.open_stateid = &state->stateid;
3393                 data->arg.new_lock_owner = 1;
3394                 data->res.open_seqid = data->arg.open_seqid;
3395         } else
3396                 data->arg.new_lock_owner = 0;
3397         data->timestamp = jiffies;
3398         rpc_call_start(task);
3399         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3400 }
3401
3402 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3403 {
3404         struct nfs4_lockdata *data = calldata;
3405
3406         dprintk("%s: begin!\n", __func__);
3407
3408         data->rpc_status = task->tk_status;
3409         if (RPC_ASSASSINATED(task))
3410                 goto out;
3411         if (data->arg.new_lock_owner != 0) {
3412                 if (data->rpc_status == 0)
3413                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3414                 else
3415                         goto out;
3416         }
3417         if (data->rpc_status == 0) {
3418                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3419                                         sizeof(data->lsp->ls_stateid.data));
3420                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3421                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3422         }
3423 out:
3424         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3425 }
3426
3427 static void nfs4_lock_release(void *calldata)
3428 {
3429         struct nfs4_lockdata *data = calldata;
3430
3431         dprintk("%s: begin!\n", __func__);
3432         nfs_free_seqid(data->arg.open_seqid);
3433         if (data->cancelled != 0) {
3434                 struct rpc_task *task;
3435                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3436                                 data->arg.lock_seqid);
3437                 if (!IS_ERR(task))
3438                         rpc_put_task(task);
3439                 dprintk("%s: cancelling lock!\n", __func__);
3440         } else
3441                 nfs_free_seqid(data->arg.lock_seqid);
3442         nfs4_put_lock_state(data->lsp);
3443         put_nfs_open_context(data->ctx);
3444         kfree(data);
3445         dprintk("%s: done!\n", __func__);
3446 }
3447
3448 static const struct rpc_call_ops nfs4_lock_ops = {
3449         .rpc_call_prepare = nfs4_lock_prepare,
3450         .rpc_call_done = nfs4_lock_done,
3451         .rpc_release = nfs4_lock_release,
3452 };
3453
3454 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3455 {
3456         struct nfs4_lockdata *data;
3457         struct rpc_task *task;
3458         struct rpc_message msg = {
3459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3460                 .rpc_cred = state->owner->so_cred,
3461         };
3462         struct rpc_task_setup task_setup_data = {
3463                 .rpc_client = NFS_CLIENT(state->inode),
3464                 .rpc_message = &msg,
3465                 .callback_ops = &nfs4_lock_ops,
3466                 .workqueue = nfsiod_workqueue,
3467                 .flags = RPC_TASK_ASYNC,
3468         };
3469         int ret;
3470
3471         dprintk("%s: begin!\n", __func__);
3472         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3473                         fl->fl_u.nfs4_fl.owner);
3474         if (data == NULL)
3475                 return -ENOMEM;
3476         if (IS_SETLKW(cmd))
3477                 data->arg.block = 1;
3478         if (reclaim != 0)
3479                 data->arg.reclaim = 1;
3480         msg.rpc_argp = &data->arg,
3481         msg.rpc_resp = &data->res,
3482         task_setup_data.callback_data = data;
3483         task = rpc_run_task(&task_setup_data);
3484         if (IS_ERR(task))
3485                 return PTR_ERR(task);
3486         ret = nfs4_wait_for_completion_rpc_task(task);
3487         if (ret == 0) {
3488                 ret = data->rpc_status;
3489                 if (ret == -NFS4ERR_DENIED)
3490                         ret = -EAGAIN;
3491         } else
3492                 data->cancelled = 1;
3493         rpc_put_task(task);
3494         dprintk("%s: done, ret = %d!\n", __func__, ret);
3495         return ret;
3496 }
3497
3498 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3499 {
3500         struct nfs_server *server = NFS_SERVER(state->inode);
3501         struct nfs4_exception exception = { };
3502         int err;
3503
3504         do {
3505                 /* Cache the lock if possible... */
3506                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3507                         return 0;
3508                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3509                 if (err != -NFS4ERR_DELAY)
3510                         break;
3511                 nfs4_handle_exception(server, err, &exception);
3512         } while (exception.retry);
3513         return err;
3514 }
3515
3516 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3517 {
3518         struct nfs_server *server = NFS_SERVER(state->inode);
3519         struct nfs4_exception exception = { };
3520         int err;
3521
3522         err = nfs4_set_lock_state(state, request);
3523         if (err != 0)
3524                 return err;
3525         do {
3526                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3527                         return 0;
3528                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3529                 if (err != -NFS4ERR_DELAY)
3530                         break;
3531                 nfs4_handle_exception(server, err, &exception);
3532         } while (exception.retry);
3533         return err;
3534 }
3535
3536 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3537 {
3538         struct nfs_inode *nfsi = NFS_I(state->inode);
3539         unsigned char fl_flags = request->fl_flags;
3540         int status;
3541
3542         /* Is this a delegated open? */
3543         status = nfs4_set_lock_state(state, request);
3544         if (status != 0)
3545                 goto out;
3546         request->fl_flags |= FL_ACCESS;
3547         status = do_vfs_lock(request->fl_file, request);
3548         if (status < 0)
3549                 goto out;
3550         down_read(&nfsi->rwsem);
3551         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3552                 /* Yes: cache locks! */
3553                 /* ...but avoid races with delegation recall... */
3554                 request->fl_flags = fl_flags & ~FL_SLEEP;
3555                 status = do_vfs_lock(request->fl_file, request);
3556                 goto out_unlock;
3557         }
3558         status = _nfs4_do_setlk(state, cmd, request, 0);
3559         if (status != 0)
3560                 goto out_unlock;
3561         /* Note: we always want to sleep here! */
3562         request->fl_flags = fl_flags | FL_SLEEP;
3563         if (do_vfs_lock(request->fl_file, request) < 0)
3564                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3565 out_unlock:
3566         up_read(&nfsi->rwsem);
3567 out:
3568         request->fl_flags = fl_flags;
3569         return status;
3570 }
3571
3572 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3573 {
3574         struct nfs4_exception exception = { };
3575         int err;
3576
3577         do {
3578                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3579                                 _nfs4_proc_setlk(state, cmd, request),
3580                                 &exception);
3581         } while (exception.retry);
3582         return err;
3583 }
3584
3585 static int
3586 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3587 {
3588         struct nfs_open_context *ctx;
3589         struct nfs4_state *state;
3590         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3591         int status;
3592
3593         /* verify open state */
3594         ctx = nfs_file_open_context(filp);
3595         state = ctx->state;
3596
3597         if (request->fl_start < 0 || request->fl_end < 0)
3598                 return -EINVAL;
3599
3600         if (IS_GETLK(cmd))
3601                 return nfs4_proc_getlk(state, F_GETLK, request);
3602
3603         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3604                 return -EINVAL;
3605
3606         if (request->fl_type == F_UNLCK)
3607                 return nfs4_proc_unlck(state, cmd, request);
3608
3609         do {
3610                 status = nfs4_proc_setlk(state, cmd, request);
3611                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3612                         break;
3613                 timeout = nfs4_set_lock_task_retry(timeout);
3614                 status = -ERESTARTSYS;
3615                 if (signalled())
3616                         break;
3617         } while(status < 0);
3618         return status;
3619 }
3620
3621 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3622 {
3623         struct nfs_server *server = NFS_SERVER(state->inode);
3624         struct nfs4_exception exception = { };
3625         int err;
3626
3627         err = nfs4_set_lock_state(state, fl);
3628         if (err != 0)
3629                 goto out;
3630         do {
3631                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3632                 if (err != -NFS4ERR_DELAY)
3633                         break;
3634                 err = nfs4_handle_exception(server, err, &exception);
3635         } while (exception.retry);
3636 out:
3637         return err;
3638 }
3639
3640 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3641
3642 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3643                 size_t buflen, int flags)
3644 {
3645         struct inode *inode = dentry->d_inode;
3646
3647         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3648                 return -EOPNOTSUPP;
3649
3650         return nfs4_proc_set_acl(inode, buf, buflen);
3651 }
3652
3653 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3654  * and that's what we'll do for e.g. user attributes that haven't been set.
3655  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3656  * attributes in kernel-managed attribute namespaces. */
3657 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3658                 size_t buflen)
3659 {
3660         struct inode *inode = dentry->d_inode;
3661
3662         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3663                 return -EOPNOTSUPP;
3664
3665         return nfs4_proc_get_acl(inode, buf, buflen);
3666 }
3667
3668 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3669 {
3670         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3671
3672         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3673                 return 0;
3674         if (buf && buflen < len)
3675                 return -ERANGE;
3676         if (buf)
3677                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3678         return len;
3679 }
3680
3681 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3682                 struct nfs4_fs_locations *fs_locations, struct page *page)
3683 {
3684         struct nfs_server *server = NFS_SERVER(dir);
3685         u32 bitmask[2] = {
3686                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3687                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3688         };
3689         struct nfs4_fs_locations_arg args = {
3690                 .dir_fh = NFS_FH(dir),
3691                 .name = name,
3692                 .page = page,
3693                 .bitmask = bitmask,
3694         };
3695         struct rpc_message msg = {
3696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3697                 .rpc_argp = &args,
3698                 .rpc_resp = fs_locations,
3699         };
3700         int status;
3701
3702         dprintk("%s: start\n", __func__);
3703         nfs_fattr_init(&fs_locations->fattr);
3704         fs_locations->server = server;
3705         fs_locations->nlocations = 0;
3706         status = rpc_call_sync(server->client, &msg, 0);
3707         dprintk("%s: returned status = %d\n", __func__, status);
3708         return status;
3709 }
3710
3711 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3712         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
3713         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
3714         .recover_open   = nfs4_open_reclaim,
3715         .recover_lock   = nfs4_lock_reclaim,
3716 };
3717
3718 struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
3719         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
3720         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
3721         .recover_open   = nfs4_open_expired,
3722         .recover_lock   = nfs4_lock_expired,
3723 };
3724
3725 static const struct inode_operations nfs4_file_inode_operations = {
3726         .permission     = nfs_permission,
3727         .getattr        = nfs_getattr,
3728         .setattr        = nfs_setattr,
3729         .getxattr       = nfs4_getxattr,
3730         .setxattr       = nfs4_setxattr,
3731         .listxattr      = nfs4_listxattr,
3732 };
3733
3734 const struct nfs_rpc_ops nfs_v4_clientops = {
3735         .version        = 4,                    /* protocol version */
3736         .dentry_ops     = &nfs4_dentry_operations,
3737         .dir_inode_ops  = &nfs4_dir_inode_operations,
3738         .file_inode_ops = &nfs4_file_inode_operations,
3739         .getroot        = nfs4_proc_get_root,
3740         .getattr        = nfs4_proc_getattr,
3741         .setattr        = nfs4_proc_setattr,
3742         .lookupfh       = nfs4_proc_lookupfh,
3743         .lookup         = nfs4_proc_lookup,
3744         .access         = nfs4_proc_access,
3745         .readlink       = nfs4_proc_readlink,
3746         .create         = nfs4_proc_create,
3747         .remove         = nfs4_proc_remove,
3748         .unlink_setup   = nfs4_proc_unlink_setup,
3749         .unlink_done    = nfs4_proc_unlink_done,
3750         .rename         = nfs4_proc_rename,
3751         .link           = nfs4_proc_link,
3752         .symlink        = nfs4_proc_symlink,
3753         .mkdir          = nfs4_proc_mkdir,
3754         .rmdir          = nfs4_proc_remove,
3755         .readdir        = nfs4_proc_readdir,
3756         .mknod          = nfs4_proc_mknod,
3757         .statfs         = nfs4_proc_statfs,
3758         .fsinfo         = nfs4_proc_fsinfo,
3759         .pathconf       = nfs4_proc_pathconf,
3760         .set_capabilities = nfs4_server_capabilities,
3761         .decode_dirent  = nfs4_decode_dirent,
3762         .read_setup     = nfs4_proc_read_setup,
3763         .read_done      = nfs4_read_done,
3764         .write_setup    = nfs4_proc_write_setup,
3765         .write_done     = nfs4_write_done,
3766         .commit_setup   = nfs4_proc_commit_setup,
3767         .commit_done    = nfs4_commit_done,
3768         .lock           = nfs4_proc_lock,
3769         .clear_acl_cache = nfs4_zap_acl_attr,
3770 };
3771
3772 /*
3773  * Local variables:
3774  *  c-basic-offset: 8
3775  * End:
3776  */