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 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                         nfs4_handle_exception(server, err, &exception);
1109         } while (exception.retry);
1110         return err;
1111 }
1112
1113 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1114 {
1115         struct nfs_open_context *ctx;
1116         int ret;
1117
1118         ctx = nfs4_state_find_open_context(state);
1119         if (IS_ERR(ctx))
1120                 return PTR_ERR(ctx);
1121         ret = nfs4_do_open_expired(ctx, state);
1122         put_nfs_open_context(ctx);
1123         return ret;
1124 }
1125
1126 /*
1127  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1128  * fields corresponding to attributes that were used to store the verifier.
1129  * Make sure we clobber those fields in the later setattr call
1130  */
1131 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1132 {
1133         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1134             !(sattr->ia_valid & ATTR_ATIME_SET))
1135                 sattr->ia_valid |= ATTR_ATIME;
1136
1137         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1138             !(sattr->ia_valid & ATTR_MTIME_SET))
1139                 sattr->ia_valid |= ATTR_MTIME;
1140 }
1141
1142 /*
1143  * Returns a referenced nfs4_state
1144  */
1145 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)
1146 {
1147         struct nfs4_state_owner  *sp;
1148         struct nfs4_state     *state = NULL;
1149         struct nfs_server       *server = NFS_SERVER(dir);
1150         struct nfs4_opendata *opendata;
1151         int status;
1152
1153         /* Protect against reboot recovery conflicts */
1154         status = -ENOMEM;
1155         if (!(sp = nfs4_get_state_owner(server, cred))) {
1156                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1157                 goto out_err;
1158         }
1159         status = nfs4_recover_expired_lease(server);
1160         if (status != 0)
1161                 goto err_put_state_owner;
1162         if (path->dentry->d_inode != NULL)
1163                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1164         status = -ENOMEM;
1165         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1166         if (opendata == NULL)
1167                 goto err_put_state_owner;
1168
1169         if (path->dentry->d_inode != NULL)
1170                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1171
1172         status = _nfs4_proc_open(opendata);
1173         if (status != 0)
1174                 goto err_opendata_put;
1175
1176         if (opendata->o_arg.open_flags & O_EXCL)
1177                 nfs4_exclusive_attrset(opendata, sattr);
1178
1179         state = nfs4_opendata_to_nfs4_state(opendata);
1180         status = PTR_ERR(state);
1181         if (IS_ERR(state))
1182                 goto err_opendata_put;
1183         nfs4_opendata_put(opendata);
1184         nfs4_put_state_owner(sp);
1185         *res = state;
1186         return 0;
1187 err_opendata_put:
1188         nfs4_opendata_put(opendata);
1189 err_put_state_owner:
1190         nfs4_put_state_owner(sp);
1191 out_err:
1192         *res = NULL;
1193         return status;
1194 }
1195
1196
1197 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)
1198 {
1199         struct nfs4_exception exception = { };
1200         struct nfs4_state *res;
1201         int status;
1202
1203         do {
1204                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1205                 if (status == 0)
1206                         break;
1207                 /* NOTE: BAD_SEQID means the server and client disagree about the
1208                  * book-keeping w.r.t. state-changing operations
1209                  * (OPEN/CLOSE/LOCK/LOCKU...)
1210                  * It is actually a sign of a bug on the client or on the server.
1211                  *
1212                  * If we receive a BAD_SEQID error in the particular case of
1213                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1214                  * have unhashed the old state_owner for us, and that we can
1215                  * therefore safely retry using a new one. We should still warn
1216                  * the user though...
1217                  */
1218                 if (status == -NFS4ERR_BAD_SEQID) {
1219                         printk(KERN_WARNING "NFS: v4 server %s "
1220                                         " returned a bad sequence-id error!\n",
1221                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1222                         exception.retry = 1;
1223                         continue;
1224                 }
1225                 /*
1226                  * BAD_STATEID on OPEN means that the server cancelled our
1227                  * state before it received the OPEN_CONFIRM.
1228                  * Recover by retrying the request as per the discussion
1229                  * on Page 181 of RFC3530.
1230                  */
1231                 if (status == -NFS4ERR_BAD_STATEID) {
1232                         exception.retry = 1;
1233                         continue;
1234                 }
1235                 if (status == -EAGAIN) {
1236                         /* We must have found a delegation */
1237                         exception.retry = 1;
1238                         continue;
1239                 }
1240                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1241                                         status, &exception));
1242         } while (exception.retry);
1243         return res;
1244 }
1245
1246 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1247                             struct nfs_fattr *fattr, struct iattr *sattr,
1248                             struct nfs4_state *state)
1249 {
1250         struct nfs_server *server = NFS_SERVER(inode);
1251         struct nfs_setattrargs  arg = {
1252                 .fh             = NFS_FH(inode),
1253                 .iap            = sattr,
1254                 .server         = server,
1255                 .bitmask = server->attr_bitmask,
1256         };
1257         struct nfs_setattrres  res = {
1258                 .fattr          = fattr,
1259                 .server         = server,
1260         };
1261         struct rpc_message msg = {
1262                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1263                 .rpc_argp       = &arg,
1264                 .rpc_resp       = &res,
1265                 .rpc_cred       = cred,
1266         };
1267         unsigned long timestamp = jiffies;
1268         int status;
1269
1270         nfs_fattr_init(fattr);
1271
1272         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1273                 /* Use that stateid */
1274         } else if (state != NULL) {
1275                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1276         } else
1277                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1278
1279         status = rpc_call_sync(server->client, &msg, 0);
1280         if (status == 0 && state != NULL)
1281                 renew_lease(server, timestamp);
1282         return status;
1283 }
1284
1285 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1286                            struct nfs_fattr *fattr, struct iattr *sattr,
1287                            struct nfs4_state *state)
1288 {
1289         struct nfs_server *server = NFS_SERVER(inode);
1290         struct nfs4_exception exception = { };
1291         int err;
1292         do {
1293                 err = nfs4_handle_exception(server,
1294                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1295                                 &exception);
1296         } while (exception.retry);
1297         return err;
1298 }
1299
1300 struct nfs4_closedata {
1301         struct path path;
1302         struct inode *inode;
1303         struct nfs4_state *state;
1304         struct nfs_closeargs arg;
1305         struct nfs_closeres res;
1306         struct nfs_fattr fattr;
1307         unsigned long timestamp;
1308 };
1309
1310 static void nfs4_free_closedata(void *data)
1311 {
1312         struct nfs4_closedata *calldata = data;
1313         struct nfs4_state_owner *sp = calldata->state->owner;
1314
1315         nfs4_put_open_state(calldata->state);
1316         nfs_free_seqid(calldata->arg.seqid);
1317         nfs4_put_state_owner(sp);
1318         path_put(&calldata->path);
1319         kfree(calldata);
1320 }
1321
1322 static void nfs4_close_done(struct rpc_task *task, void *data)
1323 {
1324         struct nfs4_closedata *calldata = data;
1325         struct nfs4_state *state = calldata->state;
1326         struct nfs_server *server = NFS_SERVER(calldata->inode);
1327
1328         if (RPC_ASSASSINATED(task))
1329                 return;
1330         /* hmm. we are done with the inode, and in the process of freeing
1331          * the state_owner. we keep this around to process errors
1332          */
1333         switch (task->tk_status) {
1334                 case 0:
1335                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1336                         renew_lease(server, calldata->timestamp);
1337                         break;
1338                 case -NFS4ERR_STALE_STATEID:
1339                 case -NFS4ERR_OLD_STATEID:
1340                 case -NFS4ERR_BAD_STATEID:
1341                 case -NFS4ERR_EXPIRED:
1342                         if (calldata->arg.fmode == 0)
1343                                 break;
1344                 default:
1345                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1346                                 rpc_restart_call(task);
1347                                 return;
1348                         }
1349         }
1350         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1351 }
1352
1353 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1354 {
1355         struct nfs4_closedata *calldata = data;
1356         struct nfs4_state *state = calldata->state;
1357         int clear_rd, clear_wr, clear_rdwr;
1358
1359         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1360                 return;
1361
1362         clear_rd = clear_wr = clear_rdwr = 0;
1363         spin_lock(&state->owner->so_lock);
1364         /* Calculate the change in open mode */
1365         if (state->n_rdwr == 0) {
1366                 if (state->n_rdonly == 0) {
1367                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1368                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1369                 }
1370                 if (state->n_wronly == 0) {
1371                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1372                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1373                 }
1374         }
1375         spin_unlock(&state->owner->so_lock);
1376         if (!clear_rd && !clear_wr && !clear_rdwr) {
1377                 /* Note: exit _without_ calling nfs4_close_done */
1378                 task->tk_action = NULL;
1379                 return;
1380         }
1381         nfs_fattr_init(calldata->res.fattr);
1382         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1383                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1384                 calldata->arg.fmode = FMODE_READ;
1385         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1386                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1387                 calldata->arg.fmode = FMODE_WRITE;
1388         }
1389         calldata->timestamp = jiffies;
1390         rpc_call_start(task);
1391 }
1392
1393 static const struct rpc_call_ops nfs4_close_ops = {
1394         .rpc_call_prepare = nfs4_close_prepare,
1395         .rpc_call_done = nfs4_close_done,
1396         .rpc_release = nfs4_free_closedata,
1397 };
1398
1399 /*
1400  * It is possible for data to be read/written from a mem-mapped file
1401  * after the sys_close call (which hits the vfs layer as a flush).
1402  * This means that we can't safely call nfsv4 close on a file until
1403  * the inode is cleared. This in turn means that we are not good
1404  * NFSv4 citizens - we do not indicate to the server to update the file's
1405  * share state even when we are done with one of the three share
1406  * stateid's in the inode.
1407  *
1408  * NOTE: Caller must be holding the sp->so_owner semaphore!
1409  */
1410 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1411 {
1412         struct nfs_server *server = NFS_SERVER(state->inode);
1413         struct nfs4_closedata *calldata;
1414         struct nfs4_state_owner *sp = state->owner;
1415         struct rpc_task *task;
1416         struct rpc_message msg = {
1417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1418                 .rpc_cred = state->owner->so_cred,
1419         };
1420         struct rpc_task_setup task_setup_data = {
1421                 .rpc_client = server->client,
1422                 .rpc_message = &msg,
1423                 .callback_ops = &nfs4_close_ops,
1424                 .workqueue = nfsiod_workqueue,
1425                 .flags = RPC_TASK_ASYNC,
1426         };
1427         int status = -ENOMEM;
1428
1429         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1430         if (calldata == NULL)
1431                 goto out;
1432         calldata->inode = state->inode;
1433         calldata->state = state;
1434         calldata->arg.fh = NFS_FH(state->inode);
1435         calldata->arg.stateid = &state->open_stateid;
1436         /* Serialization for the sequence id */
1437         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1438         if (calldata->arg.seqid == NULL)
1439                 goto out_free_calldata;
1440         calldata->arg.fmode = 0;
1441         calldata->arg.bitmask = server->attr_bitmask;
1442         calldata->res.fattr = &calldata->fattr;
1443         calldata->res.seqid = calldata->arg.seqid;
1444         calldata->res.server = server;
1445         calldata->path.mnt = mntget(path->mnt);
1446         calldata->path.dentry = dget(path->dentry);
1447
1448         msg.rpc_argp = &calldata->arg,
1449         msg.rpc_resp = &calldata->res,
1450         task_setup_data.callback_data = calldata;
1451         task = rpc_run_task(&task_setup_data);
1452         if (IS_ERR(task))
1453                 return PTR_ERR(task);
1454         status = 0;
1455         if (wait)
1456                 status = rpc_wait_for_completion_task(task);
1457         rpc_put_task(task);
1458         return status;
1459 out_free_calldata:
1460         kfree(calldata);
1461 out:
1462         nfs4_put_open_state(state);
1463         nfs4_put_state_owner(sp);
1464         return status;
1465 }
1466
1467 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1468 {
1469         struct file *filp;
1470         int ret;
1471
1472         /* If the open_intent is for execute, we have an extra check to make */
1473         if (fmode & FMODE_EXEC) {
1474                 ret = nfs_may_open(state->inode,
1475                                 state->owner->so_cred,
1476                                 nd->intent.open.flags);
1477                 if (ret < 0)
1478                         goto out_close;
1479         }
1480         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1481         if (!IS_ERR(filp)) {
1482                 struct nfs_open_context *ctx;
1483                 ctx = nfs_file_open_context(filp);
1484                 ctx->state = state;
1485                 return 0;
1486         }
1487         ret = PTR_ERR(filp);
1488 out_close:
1489         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1490         return ret;
1491 }
1492
1493 struct dentry *
1494 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1495 {
1496         struct path path = {
1497                 .mnt = nd->path.mnt,
1498                 .dentry = dentry,
1499         };
1500         struct dentry *parent;
1501         struct iattr attr;
1502         struct rpc_cred *cred;
1503         struct nfs4_state *state;
1504         struct dentry *res;
1505         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1506
1507         if (nd->flags & LOOKUP_CREATE) {
1508                 attr.ia_mode = nd->intent.open.create_mode;
1509                 attr.ia_valid = ATTR_MODE;
1510                 if (!IS_POSIXACL(dir))
1511                         attr.ia_mode &= ~current->fs->umask;
1512         } else {
1513                 attr.ia_valid = 0;
1514                 BUG_ON(nd->intent.open.flags & O_CREAT);
1515         }
1516
1517         cred = rpc_lookup_cred();
1518         if (IS_ERR(cred))
1519                 return (struct dentry *)cred;
1520         parent = dentry->d_parent;
1521         /* Protect against concurrent sillydeletes */
1522         nfs_block_sillyrename(parent);
1523         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1524         put_rpccred(cred);
1525         if (IS_ERR(state)) {
1526                 if (PTR_ERR(state) == -ENOENT) {
1527                         d_add(dentry, NULL);
1528                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1529                 }
1530                 nfs_unblock_sillyrename(parent);
1531                 return (struct dentry *)state;
1532         }
1533         res = d_add_unique(dentry, igrab(state->inode));
1534         if (res != NULL)
1535                 path.dentry = res;
1536         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1537         nfs_unblock_sillyrename(parent);
1538         nfs4_intent_set_file(nd, &path, state, fmode);
1539         return res;
1540 }
1541
1542 int
1543 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1544 {
1545         struct path path = {
1546                 .mnt = nd->path.mnt,
1547                 .dentry = dentry,
1548         };
1549         struct rpc_cred *cred;
1550         struct nfs4_state *state;
1551         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1552
1553         cred = rpc_lookup_cred();
1554         if (IS_ERR(cred))
1555                 return PTR_ERR(cred);
1556         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1557         put_rpccred(cred);
1558         if (IS_ERR(state)) {
1559                 switch (PTR_ERR(state)) {
1560                         case -EPERM:
1561                         case -EACCES:
1562                         case -EDQUOT:
1563                         case -ENOSPC:
1564                         case -EROFS:
1565                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1566                                 return 1;
1567                         default:
1568                                 goto out_drop;
1569                 }
1570         }
1571         if (state->inode == dentry->d_inode) {
1572                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1573                 nfs4_intent_set_file(nd, &path, state, fmode);
1574                 return 1;
1575         }
1576         nfs4_close_sync(&path, state, fmode);
1577 out_drop:
1578         d_drop(dentry);
1579         return 0;
1580 }
1581
1582
1583 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1584 {
1585         struct nfs4_server_caps_res res = {};
1586         struct rpc_message msg = {
1587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1588                 .rpc_argp = fhandle,
1589                 .rpc_resp = &res,
1590         };
1591         int status;
1592
1593         status = rpc_call_sync(server->client, &msg, 0);
1594         if (status == 0) {
1595                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1596                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1597                         server->caps |= NFS_CAP_ACLS;
1598                 if (res.has_links != 0)
1599                         server->caps |= NFS_CAP_HARDLINKS;
1600                 if (res.has_symlinks != 0)
1601                         server->caps |= NFS_CAP_SYMLINKS;
1602                 server->acl_bitmask = res.acl_bitmask;
1603         }
1604         return status;
1605 }
1606
1607 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1608 {
1609         struct nfs4_exception exception = { };
1610         int err;
1611         do {
1612                 err = nfs4_handle_exception(server,
1613                                 _nfs4_server_capabilities(server, fhandle),
1614                                 &exception);
1615         } while (exception.retry);
1616         return err;
1617 }
1618
1619 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1620                 struct nfs_fsinfo *info)
1621 {
1622         struct nfs4_lookup_root_arg args = {
1623                 .bitmask = nfs4_fattr_bitmap,
1624         };
1625         struct nfs4_lookup_res res = {
1626                 .server = server,
1627                 .fattr = info->fattr,
1628                 .fh = fhandle,
1629         };
1630         struct rpc_message msg = {
1631                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1632                 .rpc_argp = &args,
1633                 .rpc_resp = &res,
1634         };
1635         nfs_fattr_init(info->fattr);
1636         return rpc_call_sync(server->client, &msg, 0);
1637 }
1638
1639 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1640                 struct nfs_fsinfo *info)
1641 {
1642         struct nfs4_exception exception = { };
1643         int err;
1644         do {
1645                 err = nfs4_handle_exception(server,
1646                                 _nfs4_lookup_root(server, fhandle, info),
1647                                 &exception);
1648         } while (exception.retry);
1649         return err;
1650 }
1651
1652 /*
1653  * get the file handle for the "/" directory on the server
1654  */
1655 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1656                               struct nfs_fsinfo *info)
1657 {
1658         int status;
1659
1660         status = nfs4_lookup_root(server, fhandle, info);
1661         if (status == 0)
1662                 status = nfs4_server_capabilities(server, fhandle);
1663         if (status == 0)
1664                 status = nfs4_do_fsinfo(server, fhandle, info);
1665         return nfs4_map_errors(status);
1666 }
1667
1668 /*
1669  * Get locations and (maybe) other attributes of a referral.
1670  * Note that we'll actually follow the referral later when
1671  * we detect fsid mismatch in inode revalidation
1672  */
1673 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1674 {
1675         int status = -ENOMEM;
1676         struct page *page = NULL;
1677         struct nfs4_fs_locations *locations = NULL;
1678
1679         page = alloc_page(GFP_KERNEL);
1680         if (page == NULL)
1681                 goto out;
1682         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1683         if (locations == NULL)
1684                 goto out;
1685
1686         status = nfs4_proc_fs_locations(dir, name, locations, page);
1687         if (status != 0)
1688                 goto out;
1689         /* Make sure server returned a different fsid for the referral */
1690         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1691                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1692                 status = -EIO;
1693                 goto out;
1694         }
1695
1696         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1697         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1698         if (!fattr->mode)
1699                 fattr->mode = S_IFDIR;
1700         memset(fhandle, 0, sizeof(struct nfs_fh));
1701 out:
1702         if (page)
1703                 __free_page(page);
1704         if (locations)
1705                 kfree(locations);
1706         return status;
1707 }
1708
1709 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1710 {
1711         struct nfs4_getattr_arg args = {
1712                 .fh = fhandle,
1713                 .bitmask = server->attr_bitmask,
1714         };
1715         struct nfs4_getattr_res res = {
1716                 .fattr = fattr,
1717                 .server = server,
1718         };
1719         struct rpc_message msg = {
1720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1721                 .rpc_argp = &args,
1722                 .rpc_resp = &res,
1723         };
1724
1725         nfs_fattr_init(fattr);
1726         return rpc_call_sync(server->client, &msg, 0);
1727 }
1728
1729 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1730 {
1731         struct nfs4_exception exception = { };
1732         int err;
1733         do {
1734                 err = nfs4_handle_exception(server,
1735                                 _nfs4_proc_getattr(server, fhandle, fattr),
1736                                 &exception);
1737         } while (exception.retry);
1738         return err;
1739 }
1740
1741 /*
1742  * The file is not closed if it is opened due to the a request to change
1743  * the size of the file. The open call will not be needed once the
1744  * VFS layer lookup-intents are implemented.
1745  *
1746  * Close is called when the inode is destroyed.
1747  * If we haven't opened the file for O_WRONLY, we
1748  * need to in the size_change case to obtain a stateid.
1749  *
1750  * Got race?
1751  * Because OPEN is always done by name in nfsv4, it is
1752  * possible that we opened a different file by the same
1753  * name.  We can recognize this race condition, but we
1754  * can't do anything about it besides returning an error.
1755  *
1756  * This will be fixed with VFS changes (lookup-intent).
1757  */
1758 static int
1759 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1760                   struct iattr *sattr)
1761 {
1762         struct inode *inode = dentry->d_inode;
1763         struct rpc_cred *cred = NULL;
1764         struct nfs4_state *state = NULL;
1765         int status;
1766
1767         nfs_fattr_init(fattr);
1768
1769         /* Search for an existing open(O_WRITE) file */
1770         if (sattr->ia_valid & ATTR_FILE) {
1771                 struct nfs_open_context *ctx;
1772
1773                 ctx = nfs_file_open_context(sattr->ia_file);
1774                 if (ctx) {
1775                         cred = ctx->cred;
1776                         state = ctx->state;
1777                 }
1778         }
1779
1780         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1781         if (status == 0)
1782                 nfs_setattr_update_inode(inode, sattr);
1783         return status;
1784 }
1785
1786 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1787                 const struct qstr *name, struct nfs_fh *fhandle,
1788                 struct nfs_fattr *fattr)
1789 {
1790         int                    status;
1791         struct nfs4_lookup_arg args = {
1792                 .bitmask = server->attr_bitmask,
1793                 .dir_fh = dirfh,
1794                 .name = name,
1795         };
1796         struct nfs4_lookup_res res = {
1797                 .server = server,
1798                 .fattr = fattr,
1799                 .fh = fhandle,
1800         };
1801         struct rpc_message msg = {
1802                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1803                 .rpc_argp = &args,
1804                 .rpc_resp = &res,
1805         };
1806
1807         nfs_fattr_init(fattr);
1808
1809         dprintk("NFS call  lookupfh %s\n", name->name);
1810         status = rpc_call_sync(server->client, &msg, 0);
1811         dprintk("NFS reply lookupfh: %d\n", status);
1812         return status;
1813 }
1814
1815 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1816                               struct qstr *name, struct nfs_fh *fhandle,
1817                               struct nfs_fattr *fattr)
1818 {
1819         struct nfs4_exception exception = { };
1820         int err;
1821         do {
1822                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1823                 /* FIXME: !!!! */
1824                 if (err == -NFS4ERR_MOVED) {
1825                         err = -EREMOTE;
1826                         break;
1827                 }
1828                 err = nfs4_handle_exception(server, err, &exception);
1829         } while (exception.retry);
1830         return err;
1831 }
1832
1833 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1834                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1835 {
1836         int status;
1837
1838         dprintk("NFS call  lookup %s\n", name->name);
1839         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1840         if (status == -NFS4ERR_MOVED)
1841                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1842         dprintk("NFS reply lookup: %d\n", status);
1843         return status;
1844 }
1845
1846 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1847 {
1848         struct nfs4_exception exception = { };
1849         int err;
1850         do {
1851                 err = nfs4_handle_exception(NFS_SERVER(dir),
1852                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1853                                 &exception);
1854         } while (exception.retry);
1855         return err;
1856 }
1857
1858 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1859 {
1860         struct nfs_server *server = NFS_SERVER(inode);
1861         struct nfs_fattr fattr;
1862         struct nfs4_accessargs args = {
1863                 .fh = NFS_FH(inode),
1864                 .bitmask = server->attr_bitmask,
1865         };
1866         struct nfs4_accessres res = {
1867                 .server = server,
1868                 .fattr = &fattr,
1869         };
1870         struct rpc_message msg = {
1871                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1872                 .rpc_argp = &args,
1873                 .rpc_resp = &res,
1874                 .rpc_cred = entry->cred,
1875         };
1876         int mode = entry->mask;
1877         int status;
1878
1879         /*
1880          * Determine which access bits we want to ask for...
1881          */
1882         if (mode & MAY_READ)
1883                 args.access |= NFS4_ACCESS_READ;
1884         if (S_ISDIR(inode->i_mode)) {
1885                 if (mode & MAY_WRITE)
1886                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1887                 if (mode & MAY_EXEC)
1888                         args.access |= NFS4_ACCESS_LOOKUP;
1889         } else {
1890                 if (mode & MAY_WRITE)
1891                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1892                 if (mode & MAY_EXEC)
1893                         args.access |= NFS4_ACCESS_EXECUTE;
1894         }
1895         nfs_fattr_init(&fattr);
1896         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1897         if (!status) {
1898                 entry->mask = 0;
1899                 if (res.access & NFS4_ACCESS_READ)
1900                         entry->mask |= MAY_READ;
1901                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1902                         entry->mask |= MAY_WRITE;
1903                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1904                         entry->mask |= MAY_EXEC;
1905                 nfs_refresh_inode(inode, &fattr);
1906         }
1907         return status;
1908 }
1909
1910 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1911 {
1912         struct nfs4_exception exception = { };
1913         int err;
1914         do {
1915                 err = nfs4_handle_exception(NFS_SERVER(inode),
1916                                 _nfs4_proc_access(inode, entry),
1917                                 &exception);
1918         } while (exception.retry);
1919         return err;
1920 }
1921
1922 /*
1923  * TODO: For the time being, we don't try to get any attributes
1924  * along with any of the zero-copy operations READ, READDIR,
1925  * READLINK, WRITE.
1926  *
1927  * In the case of the first three, we want to put the GETATTR
1928  * after the read-type operation -- this is because it is hard
1929  * to predict the length of a GETATTR response in v4, and thus
1930  * align the READ data correctly.  This means that the GETATTR
1931  * may end up partially falling into the page cache, and we should
1932  * shift it into the 'tail' of the xdr_buf before processing.
1933  * To do this efficiently, we need to know the total length
1934  * of data received, which doesn't seem to be available outside
1935  * of the RPC layer.
1936  *
1937  * In the case of WRITE, we also want to put the GETATTR after
1938  * the operation -- in this case because we want to make sure
1939  * we get the post-operation mtime and size.  This means that
1940  * we can't use xdr_encode_pages() as written: we need a variant
1941  * of it which would leave room in the 'tail' iovec.
1942  *
1943  * Both of these changes to the XDR layer would in fact be quite
1944  * minor, but I decided to leave them for a subsequent patch.
1945  */
1946 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1947                 unsigned int pgbase, unsigned int pglen)
1948 {
1949         struct nfs4_readlink args = {
1950                 .fh       = NFS_FH(inode),
1951                 .pgbase   = pgbase,
1952                 .pglen    = pglen,
1953                 .pages    = &page,
1954         };
1955         struct rpc_message msg = {
1956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1957                 .rpc_argp = &args,
1958                 .rpc_resp = NULL,
1959         };
1960
1961         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1962 }
1963
1964 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1965                 unsigned int pgbase, unsigned int pglen)
1966 {
1967         struct nfs4_exception exception = { };
1968         int err;
1969         do {
1970                 err = nfs4_handle_exception(NFS_SERVER(inode),
1971                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1972                                 &exception);
1973         } while (exception.retry);
1974         return err;
1975 }
1976
1977 /*
1978  * Got race?
1979  * We will need to arrange for the VFS layer to provide an atomic open.
1980  * Until then, this create/open method is prone to inefficiency and race
1981  * conditions due to the lookup, create, and open VFS calls from sys_open()
1982  * placed on the wire.
1983  *
1984  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1985  * The file will be opened again in the subsequent VFS open call
1986  * (nfs4_proc_file_open).
1987  *
1988  * The open for read will just hang around to be used by any process that
1989  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1990  */
1991
1992 static int
1993 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1994                  int flags, struct nameidata *nd)
1995 {
1996         struct path path = {
1997                 .mnt = nd->path.mnt,
1998                 .dentry = dentry,
1999         };
2000         struct nfs4_state *state;
2001         struct rpc_cred *cred;
2002         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2003         int status = 0;
2004
2005         cred = rpc_lookup_cred();
2006         if (IS_ERR(cred)) {
2007                 status = PTR_ERR(cred);
2008                 goto out;
2009         }
2010         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2011         d_drop(dentry);
2012         if (IS_ERR(state)) {
2013                 status = PTR_ERR(state);
2014                 goto out_putcred;
2015         }
2016         d_add(dentry, igrab(state->inode));
2017         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2018         if (flags & O_EXCL) {
2019                 struct nfs_fattr fattr;
2020                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2021                 if (status == 0)
2022                         nfs_setattr_update_inode(state->inode, sattr);
2023                 nfs_post_op_update_inode(state->inode, &fattr);
2024         }
2025         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2026                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2027         else
2028                 nfs4_close_sync(&path, state, fmode);
2029 out_putcred:
2030         put_rpccred(cred);
2031 out:
2032         return status;
2033 }
2034
2035 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2036 {
2037         struct nfs_server *server = NFS_SERVER(dir);
2038         struct nfs_removeargs args = {
2039                 .fh = NFS_FH(dir),
2040                 .name.len = name->len,
2041                 .name.name = name->name,
2042                 .bitmask = server->attr_bitmask,
2043         };
2044         struct nfs_removeres res = {
2045                 .server = server,
2046         };
2047         struct rpc_message msg = {
2048                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2049                 .rpc_argp = &args,
2050                 .rpc_resp = &res,
2051         };
2052         int                     status;
2053
2054         nfs_fattr_init(&res.dir_attr);
2055         status = rpc_call_sync(server->client, &msg, 0);
2056         if (status == 0) {
2057                 update_changeattr(dir, &res.cinfo);
2058                 nfs_post_op_update_inode(dir, &res.dir_attr);
2059         }
2060         return status;
2061 }
2062
2063 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2064 {
2065         struct nfs4_exception exception = { };
2066         int err;
2067         do {
2068                 err = nfs4_handle_exception(NFS_SERVER(dir),
2069                                 _nfs4_proc_remove(dir, name),
2070                                 &exception);
2071         } while (exception.retry);
2072         return err;
2073 }
2074
2075 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2076 {
2077         struct nfs_server *server = NFS_SERVER(dir);
2078         struct nfs_removeargs *args = msg->rpc_argp;
2079         struct nfs_removeres *res = msg->rpc_resp;
2080
2081         args->bitmask = server->attr_bitmask;
2082         res->server = server;
2083         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2084 }
2085
2086 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2087 {
2088         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2089
2090         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2091                 return 0;
2092         update_changeattr(dir, &res->cinfo);
2093         nfs_post_op_update_inode(dir, &res->dir_attr);
2094         return 1;
2095 }
2096
2097 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2098                 struct inode *new_dir, struct qstr *new_name)
2099 {
2100         struct nfs_server *server = NFS_SERVER(old_dir);
2101         struct nfs4_rename_arg arg = {
2102                 .old_dir = NFS_FH(old_dir),
2103                 .new_dir = NFS_FH(new_dir),
2104                 .old_name = old_name,
2105                 .new_name = new_name,
2106                 .bitmask = server->attr_bitmask,
2107         };
2108         struct nfs_fattr old_fattr, new_fattr;
2109         struct nfs4_rename_res res = {
2110                 .server = server,
2111                 .old_fattr = &old_fattr,
2112                 .new_fattr = &new_fattr,
2113         };
2114         struct rpc_message msg = {
2115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2116                 .rpc_argp = &arg,
2117                 .rpc_resp = &res,
2118         };
2119         int                     status;
2120
2121         nfs_fattr_init(res.old_fattr);
2122         nfs_fattr_init(res.new_fattr);
2123         status = rpc_call_sync(server->client, &msg, 0);
2124
2125         if (!status) {
2126                 update_changeattr(old_dir, &res.old_cinfo);
2127                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2128                 update_changeattr(new_dir, &res.new_cinfo);
2129                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2130         }
2131         return status;
2132 }
2133
2134 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2135                 struct inode *new_dir, struct qstr *new_name)
2136 {
2137         struct nfs4_exception exception = { };
2138         int err;
2139         do {
2140                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2141                                 _nfs4_proc_rename(old_dir, old_name,
2142                                         new_dir, new_name),
2143                                 &exception);
2144         } while (exception.retry);
2145         return err;
2146 }
2147
2148 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2149 {
2150         struct nfs_server *server = NFS_SERVER(inode);
2151         struct nfs4_link_arg arg = {
2152                 .fh     = NFS_FH(inode),
2153                 .dir_fh = NFS_FH(dir),
2154                 .name   = name,
2155                 .bitmask = server->attr_bitmask,
2156         };
2157         struct nfs_fattr fattr, dir_attr;
2158         struct nfs4_link_res res = {
2159                 .server = server,
2160                 .fattr = &fattr,
2161                 .dir_attr = &dir_attr,
2162         };
2163         struct rpc_message msg = {
2164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2165                 .rpc_argp = &arg,
2166                 .rpc_resp = &res,
2167         };
2168         int                     status;
2169
2170         nfs_fattr_init(res.fattr);
2171         nfs_fattr_init(res.dir_attr);
2172         status = rpc_call_sync(server->client, &msg, 0);
2173         if (!status) {
2174                 update_changeattr(dir, &res.cinfo);
2175                 nfs_post_op_update_inode(dir, res.dir_attr);
2176                 nfs_post_op_update_inode(inode, res.fattr);
2177         }
2178
2179         return status;
2180 }
2181
2182 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2183 {
2184         struct nfs4_exception exception = { };
2185         int err;
2186         do {
2187                 err = nfs4_handle_exception(NFS_SERVER(inode),
2188                                 _nfs4_proc_link(inode, dir, name),
2189                                 &exception);
2190         } while (exception.retry);
2191         return err;
2192 }
2193
2194 struct nfs4_createdata {
2195         struct rpc_message msg;
2196         struct nfs4_create_arg arg;
2197         struct nfs4_create_res res;
2198         struct nfs_fh fh;
2199         struct nfs_fattr fattr;
2200         struct nfs_fattr dir_fattr;
2201 };
2202
2203 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2204                 struct qstr *name, struct iattr *sattr, u32 ftype)
2205 {
2206         struct nfs4_createdata *data;
2207
2208         data = kzalloc(sizeof(*data), GFP_KERNEL);
2209         if (data != NULL) {
2210                 struct nfs_server *server = NFS_SERVER(dir);
2211
2212                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2213                 data->msg.rpc_argp = &data->arg;
2214                 data->msg.rpc_resp = &data->res;
2215                 data->arg.dir_fh = NFS_FH(dir);
2216                 data->arg.server = server;
2217                 data->arg.name = name;
2218                 data->arg.attrs = sattr;
2219                 data->arg.ftype = ftype;
2220                 data->arg.bitmask = server->attr_bitmask;
2221                 data->res.server = server;
2222                 data->res.fh = &data->fh;
2223                 data->res.fattr = &data->fattr;
2224                 data->res.dir_fattr = &data->dir_fattr;
2225                 nfs_fattr_init(data->res.fattr);
2226                 nfs_fattr_init(data->res.dir_fattr);
2227         }
2228         return data;
2229 }
2230
2231 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2232 {
2233         int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2234         if (status == 0) {
2235                 update_changeattr(dir, &data->res.dir_cinfo);
2236                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2237                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2238         }
2239         return status;
2240 }
2241
2242 static void nfs4_free_createdata(struct nfs4_createdata *data)
2243 {
2244         kfree(data);
2245 }
2246
2247 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2248                 struct page *page, unsigned int len, struct iattr *sattr)
2249 {
2250         struct nfs4_createdata *data;
2251         int status = -ENAMETOOLONG;
2252
2253         if (len > NFS4_MAXPATHLEN)
2254                 goto out;
2255
2256         status = -ENOMEM;
2257         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2258         if (data == NULL)
2259                 goto out;
2260
2261         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2262         data->arg.u.symlink.pages = &page;
2263         data->arg.u.symlink.len = len;
2264
2265         status = nfs4_do_create(dir, dentry, data);
2266
2267         nfs4_free_createdata(data);
2268 out:
2269         return status;
2270 }
2271
2272 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2273                 struct page *page, unsigned int len, struct iattr *sattr)
2274 {
2275         struct nfs4_exception exception = { };
2276         int err;
2277         do {
2278                 err = nfs4_handle_exception(NFS_SERVER(dir),
2279                                 _nfs4_proc_symlink(dir, dentry, page,
2280                                                         len, sattr),
2281                                 &exception);
2282         } while (exception.retry);
2283         return err;
2284 }
2285
2286 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2287                 struct iattr *sattr)
2288 {
2289         struct nfs4_createdata *data;
2290         int status = -ENOMEM;
2291
2292         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2293         if (data == NULL)
2294                 goto out;
2295
2296         status = nfs4_do_create(dir, dentry, data);
2297
2298         nfs4_free_createdata(data);
2299 out:
2300         return status;
2301 }
2302
2303 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2304                 struct iattr *sattr)
2305 {
2306         struct nfs4_exception exception = { };
2307         int err;
2308         do {
2309                 err = nfs4_handle_exception(NFS_SERVER(dir),
2310                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2311                                 &exception);
2312         } while (exception.retry);
2313         return err;
2314 }
2315
2316 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2317                   u64 cookie, struct page *page, unsigned int count, int plus)
2318 {
2319         struct inode            *dir = dentry->d_inode;
2320         struct nfs4_readdir_arg args = {
2321                 .fh = NFS_FH(dir),
2322                 .pages = &page,
2323                 .pgbase = 0,
2324                 .count = count,
2325                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2326         };
2327         struct nfs4_readdir_res res;
2328         struct rpc_message msg = {
2329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2330                 .rpc_argp = &args,
2331                 .rpc_resp = &res,
2332                 .rpc_cred = cred,
2333         };
2334         int                     status;
2335
2336         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2337                         dentry->d_parent->d_name.name,
2338                         dentry->d_name.name,
2339                         (unsigned long long)cookie);
2340         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2341         res.pgbase = args.pgbase;
2342         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2343         if (status == 0)
2344                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2345
2346         nfs_invalidate_atime(dir);
2347
2348         dprintk("%s: returns %d\n", __func__, status);
2349         return status;
2350 }
2351
2352 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2353                   u64 cookie, struct page *page, unsigned int count, int plus)
2354 {
2355         struct nfs4_exception exception = { };
2356         int err;
2357         do {
2358                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2359                                 _nfs4_proc_readdir(dentry, cred, cookie,
2360                                         page, count, plus),
2361                                 &exception);
2362         } while (exception.retry);
2363         return err;
2364 }
2365
2366 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2367                 struct iattr *sattr, dev_t rdev)
2368 {
2369         struct nfs4_createdata *data;
2370         int mode = sattr->ia_mode;
2371         int status = -ENOMEM;
2372
2373         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2374         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2375
2376         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2377         if (data == NULL)
2378                 goto out;
2379
2380         if (S_ISFIFO(mode))
2381                 data->arg.ftype = NF4FIFO;
2382         else if (S_ISBLK(mode)) {
2383                 data->arg.ftype = NF4BLK;
2384                 data->arg.u.device.specdata1 = MAJOR(rdev);
2385                 data->arg.u.device.specdata2 = MINOR(rdev);
2386         }
2387         else if (S_ISCHR(mode)) {
2388                 data->arg.ftype = NF4CHR;
2389                 data->arg.u.device.specdata1 = MAJOR(rdev);
2390                 data->arg.u.device.specdata2 = MINOR(rdev);
2391         }
2392
2393         status = nfs4_do_create(dir, dentry, data);
2394
2395         nfs4_free_createdata(data);
2396 out:
2397         return status;
2398 }
2399
2400 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2401                 struct iattr *sattr, dev_t rdev)
2402 {
2403         struct nfs4_exception exception = { };
2404         int err;
2405         do {
2406                 err = nfs4_handle_exception(NFS_SERVER(dir),
2407                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2408                                 &exception);
2409         } while (exception.retry);
2410         return err;
2411 }
2412
2413 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2414                  struct nfs_fsstat *fsstat)
2415 {
2416         struct nfs4_statfs_arg args = {
2417                 .fh = fhandle,
2418                 .bitmask = server->attr_bitmask,
2419         };
2420         struct rpc_message msg = {
2421                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2422                 .rpc_argp = &args,
2423                 .rpc_resp = fsstat,
2424         };
2425
2426         nfs_fattr_init(fsstat->fattr);
2427         return rpc_call_sync(server->client, &msg, 0);
2428 }
2429
2430 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2431 {
2432         struct nfs4_exception exception = { };
2433         int err;
2434         do {
2435                 err = nfs4_handle_exception(server,
2436                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2437                                 &exception);
2438         } while (exception.retry);
2439         return err;
2440 }
2441
2442 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2443                 struct nfs_fsinfo *fsinfo)
2444 {
2445         struct nfs4_fsinfo_arg args = {
2446                 .fh = fhandle,
2447                 .bitmask = server->attr_bitmask,
2448         };
2449         struct rpc_message msg = {
2450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2451                 .rpc_argp = &args,
2452                 .rpc_resp = fsinfo,
2453         };
2454
2455         return rpc_call_sync(server->client, &msg, 0);
2456 }
2457
2458 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2459 {
2460         struct nfs4_exception exception = { };
2461         int err;
2462
2463         do {
2464                 err = nfs4_handle_exception(server,
2465                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2466                                 &exception);
2467         } while (exception.retry);
2468         return err;
2469 }
2470
2471 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2472 {
2473         nfs_fattr_init(fsinfo->fattr);
2474         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2475 }
2476
2477 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2478                 struct nfs_pathconf *pathconf)
2479 {
2480         struct nfs4_pathconf_arg args = {
2481                 .fh = fhandle,
2482                 .bitmask = server->attr_bitmask,
2483         };
2484         struct rpc_message msg = {
2485                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2486                 .rpc_argp = &args,
2487                 .rpc_resp = pathconf,
2488         };
2489
2490         /* None of the pathconf attributes are mandatory to implement */
2491         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2492                 memset(pathconf, 0, sizeof(*pathconf));
2493                 return 0;
2494         }
2495
2496         nfs_fattr_init(pathconf->fattr);
2497         return rpc_call_sync(server->client, &msg, 0);
2498 }
2499
2500 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2501                 struct nfs_pathconf *pathconf)
2502 {
2503         struct nfs4_exception exception = { };
2504         int err;
2505
2506         do {
2507                 err = nfs4_handle_exception(server,
2508                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2509                                 &exception);
2510         } while (exception.retry);
2511         return err;
2512 }
2513
2514 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2515 {
2516         struct nfs_server *server = NFS_SERVER(data->inode);
2517
2518         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2519                 rpc_restart_call(task);
2520                 return -EAGAIN;
2521         }
2522
2523         nfs_invalidate_atime(data->inode);
2524         if (task->tk_status > 0)
2525                 renew_lease(server, data->timestamp);
2526         return 0;
2527 }
2528
2529 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2530 {
2531         data->timestamp   = jiffies;
2532         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2533 }
2534
2535 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2536 {
2537         struct inode *inode = data->inode;
2538
2539         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2540                 rpc_restart_call(task);
2541                 return -EAGAIN;
2542         }
2543         if (task->tk_status >= 0) {
2544                 renew_lease(NFS_SERVER(inode), data->timestamp);
2545                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2546         }
2547         return 0;
2548 }
2549
2550 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2551 {
2552         struct nfs_server *server = NFS_SERVER(data->inode);
2553
2554         data->args.bitmask = server->attr_bitmask;
2555         data->res.server = server;
2556         data->timestamp   = jiffies;
2557
2558         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2559 }
2560
2561 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2562 {
2563         struct inode *inode = data->inode;
2564
2565         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2566                 rpc_restart_call(task);
2567                 return -EAGAIN;
2568         }
2569         nfs_refresh_inode(inode, data->res.fattr);
2570         return 0;
2571 }
2572
2573 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2574 {
2575         struct nfs_server *server = NFS_SERVER(data->inode);
2576
2577         data->args.bitmask = server->attr_bitmask;
2578         data->res.server = server;
2579         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2580 }
2581
2582 /*
2583  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2584  * standalone procedure for queueing an asynchronous RENEW.
2585  */
2586 static void nfs4_renew_done(struct rpc_task *task, void *data)
2587 {
2588         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2589         unsigned long timestamp = (unsigned long)data;
2590
2591         if (task->tk_status < 0) {
2592                 switch (task->tk_status) {
2593                         case -NFS4ERR_STALE_CLIENTID:
2594                         case -NFS4ERR_EXPIRED:
2595                         case -NFS4ERR_CB_PATH_DOWN:
2596                                 nfs4_schedule_state_recovery(clp);
2597                 }
2598                 return;
2599         }
2600         spin_lock(&clp->cl_lock);
2601         if (time_before(clp->cl_last_renewal,timestamp))
2602                 clp->cl_last_renewal = timestamp;
2603         spin_unlock(&clp->cl_lock);
2604 }
2605
2606 static const struct rpc_call_ops nfs4_renew_ops = {
2607         .rpc_call_done = nfs4_renew_done,
2608 };
2609
2610 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2611 {
2612         struct rpc_message msg = {
2613                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2614                 .rpc_argp       = clp,
2615                 .rpc_cred       = cred,
2616         };
2617
2618         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2619                         &nfs4_renew_ops, (void *)jiffies);
2620 }
2621
2622 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2623 {
2624         struct rpc_message msg = {
2625                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2626                 .rpc_argp       = clp,
2627                 .rpc_cred       = cred,
2628         };
2629         unsigned long now = jiffies;
2630         int status;
2631
2632         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2633         if (status < 0)
2634                 return status;
2635         spin_lock(&clp->cl_lock);
2636         if (time_before(clp->cl_last_renewal,now))
2637                 clp->cl_last_renewal = now;
2638         spin_unlock(&clp->cl_lock);
2639         return 0;
2640 }
2641
2642 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2643 {
2644         return (server->caps & NFS_CAP_ACLS)
2645                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2646                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2647 }
2648
2649 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2650  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2651  * the stack.
2652  */
2653 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2654
2655 static void buf_to_pages(const void *buf, size_t buflen,
2656                 struct page **pages, unsigned int *pgbase)
2657 {
2658         const void *p = buf;
2659
2660         *pgbase = offset_in_page(buf);
2661         p -= *pgbase;
2662         while (p < buf + buflen) {
2663                 *(pages++) = virt_to_page(p);
2664                 p += PAGE_CACHE_SIZE;
2665         }
2666 }
2667
2668 struct nfs4_cached_acl {
2669         int cached;
2670         size_t len;
2671         char data[0];
2672 };
2673
2674 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2675 {
2676         struct nfs_inode *nfsi = NFS_I(inode);
2677
2678         spin_lock(&inode->i_lock);
2679         kfree(nfsi->nfs4_acl);
2680         nfsi->nfs4_acl = acl;
2681         spin_unlock(&inode->i_lock);
2682 }
2683
2684 static void nfs4_zap_acl_attr(struct inode *inode)
2685 {
2686         nfs4_set_cached_acl(inode, NULL);
2687 }
2688
2689 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2690 {
2691         struct nfs_inode *nfsi = NFS_I(inode);
2692         struct nfs4_cached_acl *acl;
2693         int ret = -ENOENT;
2694
2695         spin_lock(&inode->i_lock);
2696         acl = nfsi->nfs4_acl;
2697         if (acl == NULL)
2698                 goto out;
2699         if (buf == NULL) /* user is just asking for length */
2700                 goto out_len;
2701         if (acl->cached == 0)
2702                 goto out;
2703         ret = -ERANGE; /* see getxattr(2) man page */
2704         if (acl->len > buflen)
2705                 goto out;
2706         memcpy(buf, acl->data, acl->len);
2707 out_len:
2708         ret = acl->len;
2709 out:
2710         spin_unlock(&inode->i_lock);
2711         return ret;
2712 }
2713
2714 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2715 {
2716         struct nfs4_cached_acl *acl;
2717
2718         if (buf && acl_len <= PAGE_SIZE) {
2719                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2720                 if (acl == NULL)
2721                         goto out;
2722                 acl->cached = 1;
2723                 memcpy(acl->data, buf, acl_len);
2724         } else {
2725                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2726                 if (acl == NULL)
2727                         goto out;
2728                 acl->cached = 0;
2729         }
2730         acl->len = acl_len;
2731 out:
2732         nfs4_set_cached_acl(inode, acl);
2733 }
2734
2735 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2736 {
2737         struct page *pages[NFS4ACL_MAXPAGES];
2738         struct nfs_getaclargs args = {
2739                 .fh = NFS_FH(inode),
2740                 .acl_pages = pages,
2741                 .acl_len = buflen,
2742         };
2743         size_t resp_len = buflen;
2744         void *resp_buf;
2745         struct rpc_message msg = {
2746                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2747                 .rpc_argp = &args,
2748                 .rpc_resp = &resp_len,
2749         };
2750         struct page *localpage = NULL;
2751         int ret;
2752
2753         if (buflen < PAGE_SIZE) {
2754                 /* As long as we're doing a round trip to the server anyway,
2755                  * let's be prepared for a page of acl data. */
2756                 localpage = alloc_page(GFP_KERNEL);
2757                 resp_buf = page_address(localpage);
2758                 if (localpage == NULL)
2759                         return -ENOMEM;
2760                 args.acl_pages[0] = localpage;
2761                 args.acl_pgbase = 0;
2762                 resp_len = args.acl_len = PAGE_SIZE;
2763         } else {
2764                 resp_buf = buf;
2765                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2766         }
2767         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2768         if (ret)
2769                 goto out_free;
2770         if (resp_len > args.acl_len)
2771                 nfs4_write_cached_acl(inode, NULL, resp_len);
2772         else
2773                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2774         if (buf) {
2775                 ret = -ERANGE;
2776                 if (resp_len > buflen)
2777                         goto out_free;
2778                 if (localpage)
2779                         memcpy(buf, resp_buf, resp_len);
2780         }
2781         ret = resp_len;
2782 out_free:
2783         if (localpage)
2784                 __free_page(localpage);
2785         return ret;
2786 }
2787
2788 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2789 {
2790         struct nfs4_exception exception = { };
2791         ssize_t ret;
2792         do {
2793                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2794                 if (ret >= 0)
2795                         break;
2796                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2797         } while (exception.retry);
2798         return ret;
2799 }
2800
2801 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2802 {
2803         struct nfs_server *server = NFS_SERVER(inode);
2804         int ret;
2805
2806         if (!nfs4_server_supports_acls(server))
2807                 return -EOPNOTSUPP;
2808         ret = nfs_revalidate_inode(server, inode);
2809         if (ret < 0)
2810                 return ret;
2811         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2812                 nfs_zap_acl_cache(inode);
2813         ret = nfs4_read_cached_acl(inode, buf, buflen);
2814         if (ret != -ENOENT)
2815                 return ret;
2816         return nfs4_get_acl_uncached(inode, buf, buflen);
2817 }
2818
2819 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2820 {
2821         struct nfs_server *server = NFS_SERVER(inode);
2822         struct page *pages[NFS4ACL_MAXPAGES];
2823         struct nfs_setaclargs arg = {
2824                 .fh             = NFS_FH(inode),
2825                 .acl_pages      = pages,
2826                 .acl_len        = buflen,
2827         };
2828         struct rpc_message msg = {
2829                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2830                 .rpc_argp       = &arg,
2831                 .rpc_resp       = NULL,
2832         };
2833         int ret;
2834
2835         if (!nfs4_server_supports_acls(server))
2836                 return -EOPNOTSUPP;
2837         nfs_inode_return_delegation(inode);
2838         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2839         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2840         nfs_access_zap_cache(inode);
2841         nfs_zap_acl_cache(inode);
2842         return ret;
2843 }
2844
2845 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2846 {
2847         struct nfs4_exception exception = { };
2848         int err;
2849         do {
2850                 err = nfs4_handle_exception(NFS_SERVER(inode),
2851                                 __nfs4_proc_set_acl(inode, buf, buflen),
2852                                 &exception);
2853         } while (exception.retry);
2854         return err;
2855 }
2856
2857 static int
2858 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
2859 {
2860         struct nfs_client *clp = server->nfs_client;
2861
2862         if (!clp || task->tk_status >= 0)
2863                 return 0;
2864         switch(task->tk_status) {
2865                 case -NFS4ERR_ADMIN_REVOKED:
2866                 case -NFS4ERR_BAD_STATEID:
2867                 case -NFS4ERR_OPENMODE:
2868                         if (state == NULL)
2869                                 break;
2870                         nfs4_state_mark_reclaim_nograce(clp, state);
2871                 case -NFS4ERR_STALE_CLIENTID:
2872                 case -NFS4ERR_STALE_STATEID:
2873                 case -NFS4ERR_EXPIRED:
2874                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2875                         nfs4_schedule_state_recovery(clp);
2876                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
2877                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2878                         task->tk_status = 0;
2879                         return -EAGAIN;
2880                 case -NFS4ERR_DELAY:
2881                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2882                 case -NFS4ERR_GRACE:
2883                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2884                         task->tk_status = 0;
2885                         return -EAGAIN;
2886                 case -NFS4ERR_OLD_STATEID:
2887                         task->tk_status = 0;
2888                         return -EAGAIN;
2889         }
2890         task->tk_status = nfs4_map_errors(task->tk_status);
2891         return 0;
2892 }
2893
2894 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2895 {
2896         nfs4_verifier sc_verifier;
2897         struct nfs4_setclientid setclientid = {
2898                 .sc_verifier = &sc_verifier,
2899                 .sc_prog = program,
2900         };
2901         struct rpc_message msg = {
2902                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2903                 .rpc_argp = &setclientid,
2904                 .rpc_resp = clp,
2905                 .rpc_cred = cred,
2906         };
2907         __be32 *p;
2908         int loop = 0;
2909         int status;
2910
2911         p = (__be32*)sc_verifier.data;
2912         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2913         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2914
2915         for(;;) {
2916                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2917                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2918                                 clp->cl_ipaddr,
2919                                 rpc_peeraddr2str(clp->cl_rpcclient,
2920                                                         RPC_DISPLAY_ADDR),
2921                                 rpc_peeraddr2str(clp->cl_rpcclient,
2922                                                         RPC_DISPLAY_PROTO),
2923                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2924                                 clp->cl_id_uniquifier);
2925                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2926                                 sizeof(setclientid.sc_netid),
2927                                 rpc_peeraddr2str(clp->cl_rpcclient,
2928                                                         RPC_DISPLAY_NETID));
2929                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2930                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2931                                 clp->cl_ipaddr, port >> 8, port & 255);
2932
2933                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2934                 if (status != -NFS4ERR_CLID_INUSE)
2935                         break;
2936                 if (signalled())
2937                         break;
2938                 if (loop++ & 1)
2939                         ssleep(clp->cl_lease_time + 1);
2940                 else
2941                         if (++clp->cl_id_uniquifier == 0)
2942                                 break;
2943         }
2944         return status;
2945 }
2946
2947 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2948 {
2949         struct nfs_fsinfo fsinfo;
2950         struct rpc_message msg = {
2951                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2952                 .rpc_argp = clp,
2953                 .rpc_resp = &fsinfo,
2954                 .rpc_cred = cred,
2955         };
2956         unsigned long now;
2957         int status;
2958
2959         now = jiffies;
2960         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2961         if (status == 0) {
2962                 spin_lock(&clp->cl_lock);
2963                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2964                 clp->cl_last_renewal = now;
2965                 spin_unlock(&clp->cl_lock);
2966         }
2967         return status;
2968 }
2969
2970 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2971 {
2972         long timeout = 0;
2973         int err;
2974         do {
2975                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2976                 switch (err) {
2977                         case 0:
2978                                 return err;
2979                         case -NFS4ERR_RESOURCE:
2980                                 /* The IBM lawyers misread another document! */
2981                         case -NFS4ERR_DELAY:
2982                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2983                 }
2984         } while (err == 0);
2985         return err;
2986 }
2987
2988 struct nfs4_delegreturndata {
2989         struct nfs4_delegreturnargs args;
2990         struct nfs4_delegreturnres res;
2991         struct nfs_fh fh;
2992         nfs4_stateid stateid;
2993         unsigned long timestamp;
2994         struct nfs_fattr fattr;
2995         int rpc_status;
2996 };
2997
2998 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2999 {
3000         struct nfs4_delegreturndata *data = calldata;
3001         data->rpc_status = task->tk_status;
3002         if (data->rpc_status == 0)
3003                 renew_lease(data->res.server, data->timestamp);
3004 }
3005
3006 static void nfs4_delegreturn_release(void *calldata)
3007 {
3008         kfree(calldata);
3009 }
3010
3011 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3012         .rpc_call_done = nfs4_delegreturn_done,
3013         .rpc_release = nfs4_delegreturn_release,
3014 };
3015
3016 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3017 {
3018         struct nfs4_delegreturndata *data;
3019         struct nfs_server *server = NFS_SERVER(inode);
3020         struct rpc_task *task;
3021         struct rpc_message msg = {
3022                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3023                 .rpc_cred = cred,
3024         };
3025         struct rpc_task_setup task_setup_data = {
3026                 .rpc_client = server->client,
3027                 .rpc_message = &msg,
3028                 .callback_ops = &nfs4_delegreturn_ops,
3029                 .flags = RPC_TASK_ASYNC,
3030         };
3031         int status = 0;
3032
3033         data = kmalloc(sizeof(*data), GFP_KERNEL);
3034         if (data == NULL)
3035                 return -ENOMEM;
3036         data->args.fhandle = &data->fh;
3037         data->args.stateid = &data->stateid;
3038         data->args.bitmask = server->attr_bitmask;
3039         nfs_copy_fh(&data->fh, NFS_FH(inode));
3040         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3041         data->res.fattr = &data->fattr;
3042         data->res.server = server;
3043         nfs_fattr_init(data->res.fattr);
3044         data->timestamp = jiffies;
3045         data->rpc_status = 0;
3046
3047         task_setup_data.callback_data = data;
3048         msg.rpc_argp = &data->args,
3049         msg.rpc_resp = &data->res,
3050         task = rpc_run_task(&task_setup_data);
3051         if (IS_ERR(task))
3052                 return PTR_ERR(task);
3053         if (!issync)
3054                 goto out;
3055         status = nfs4_wait_for_completion_rpc_task(task);
3056         if (status != 0)
3057                 goto out;
3058         status = data->rpc_status;
3059         if (status != 0)
3060                 goto out;
3061         nfs_refresh_inode(inode, &data->fattr);
3062 out:
3063         rpc_put_task(task);
3064         return status;
3065 }
3066
3067 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3068 {
3069         struct nfs_server *server = NFS_SERVER(inode);
3070         struct nfs4_exception exception = { };
3071         int err;
3072         do {
3073                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3074                 switch (err) {
3075                         case -NFS4ERR_STALE_STATEID:
3076                         case -NFS4ERR_EXPIRED:
3077                         case 0:
3078                                 return 0;
3079                 }
3080                 err = nfs4_handle_exception(server, err, &exception);
3081         } while (exception.retry);
3082         return err;
3083 }
3084
3085 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3086 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3087
3088 /*
3089  * sleep, with exponential backoff, and retry the LOCK operation.
3090  */
3091 static unsigned long
3092 nfs4_set_lock_task_retry(unsigned long timeout)
3093 {
3094         schedule_timeout_killable(timeout);
3095         timeout <<= 1;
3096         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3097                 return NFS4_LOCK_MAXTIMEOUT;
3098         return timeout;
3099 }
3100
3101 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3102 {
3103         struct inode *inode = state->inode;
3104         struct nfs_server *server = NFS_SERVER(inode);
3105         struct nfs_client *clp = server->nfs_client;
3106         struct nfs_lockt_args arg = {
3107                 .fh = NFS_FH(inode),
3108                 .fl = request,
3109         };
3110         struct nfs_lockt_res res = {
3111                 .denied = request,
3112         };
3113         struct rpc_message msg = {
3114                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3115                 .rpc_argp       = &arg,
3116                 .rpc_resp       = &res,
3117                 .rpc_cred       = state->owner->so_cred,
3118         };
3119         struct nfs4_lock_state *lsp;
3120         int status;
3121
3122         arg.lock_owner.clientid = clp->cl_clientid;
3123         status = nfs4_set_lock_state(state, request);
3124         if (status != 0)
3125                 goto out;
3126         lsp = request->fl_u.nfs4_fl.owner;
3127         arg.lock_owner.id = lsp->ls_id.id;
3128         status = rpc_call_sync(server->client, &msg, 0);
3129         switch (status) {
3130                 case 0:
3131                         request->fl_type = F_UNLCK;
3132                         break;
3133                 case -NFS4ERR_DENIED:
3134                         status = 0;
3135         }
3136         request->fl_ops->fl_release_private(request);
3137 out:
3138         return status;
3139 }
3140
3141 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3142 {
3143         struct nfs4_exception exception = { };
3144         int err;
3145
3146         do {
3147                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3148                                 _nfs4_proc_getlk(state, cmd, request),
3149                                 &exception);
3150         } while (exception.retry);
3151         return err;
3152 }
3153
3154 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3155 {
3156         int res = 0;
3157         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3158                 case FL_POSIX:
3159                         res = posix_lock_file_wait(file, fl);
3160                         break;
3161                 case FL_FLOCK:
3162                         res = flock_lock_file_wait(file, fl);
3163                         break;
3164                 default:
3165                         BUG();
3166         }
3167         return res;
3168 }
3169
3170 struct nfs4_unlockdata {
3171         struct nfs_locku_args arg;
3172         struct nfs_locku_res res;
3173         struct nfs4_lock_state *lsp;
3174         struct nfs_open_context *ctx;
3175         struct file_lock fl;
3176         const struct nfs_server *server;
3177         unsigned long timestamp;
3178 };
3179
3180 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3181                 struct nfs_open_context *ctx,
3182                 struct nfs4_lock_state *lsp,
3183                 struct nfs_seqid *seqid)
3184 {
3185         struct nfs4_unlockdata *p;
3186         struct inode *inode = lsp->ls_state->inode;
3187
3188         p = kmalloc(sizeof(*p), GFP_KERNEL);
3189         if (p == NULL)
3190                 return NULL;
3191         p->arg.fh = NFS_FH(inode);
3192         p->arg.fl = &p->fl;
3193         p->arg.seqid = seqid;
3194         p->res.seqid = seqid;
3195         p->arg.stateid = &lsp->ls_stateid;
3196         p->lsp = lsp;
3197         atomic_inc(&lsp->ls_count);
3198         /* Ensure we don't close file until we're done freeing locks! */
3199         p->ctx = get_nfs_open_context(ctx);
3200         memcpy(&p->fl, fl, sizeof(p->fl));
3201         p->server = NFS_SERVER(inode);
3202         return p;
3203 }
3204
3205 static void nfs4_locku_release_calldata(void *data)
3206 {
3207         struct nfs4_unlockdata *calldata = data;
3208         nfs_free_seqid(calldata->arg.seqid);
3209         nfs4_put_lock_state(calldata->lsp);
3210         put_nfs_open_context(calldata->ctx);
3211         kfree(calldata);
3212 }
3213
3214 static void nfs4_locku_done(struct rpc_task *task, void *data)
3215 {
3216         struct nfs4_unlockdata *calldata = data;
3217
3218         if (RPC_ASSASSINATED(task))
3219                 return;
3220         switch (task->tk_status) {
3221                 case 0:
3222                         memcpy(calldata->lsp->ls_stateid.data,
3223                                         calldata->res.stateid.data,
3224                                         sizeof(calldata->lsp->ls_stateid.data));
3225                         renew_lease(calldata->server, calldata->timestamp);
3226                         break;
3227                 case -NFS4ERR_BAD_STATEID:
3228                 case -NFS4ERR_OLD_STATEID:
3229                 case -NFS4ERR_STALE_STATEID:
3230                 case -NFS4ERR_EXPIRED:
3231                         break;
3232                 default:
3233                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3234                                 rpc_restart_call(task);
3235         }
3236 }
3237
3238 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3239 {
3240         struct nfs4_unlockdata *calldata = data;
3241
3242         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3243                 return;
3244         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3245                 /* Note: exit _without_ running nfs4_locku_done */
3246                 task->tk_action = NULL;
3247                 return;
3248         }
3249         calldata->timestamp = jiffies;
3250         rpc_call_start(task);
3251 }
3252
3253 static const struct rpc_call_ops nfs4_locku_ops = {
3254         .rpc_call_prepare = nfs4_locku_prepare,
3255         .rpc_call_done = nfs4_locku_done,
3256         .rpc_release = nfs4_locku_release_calldata,
3257 };
3258
3259 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3260                 struct nfs_open_context *ctx,
3261                 struct nfs4_lock_state *lsp,
3262                 struct nfs_seqid *seqid)
3263 {
3264         struct nfs4_unlockdata *data;
3265         struct rpc_message msg = {
3266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3267                 .rpc_cred = ctx->cred,
3268         };
3269         struct rpc_task_setup task_setup_data = {
3270                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3271                 .rpc_message = &msg,
3272                 .callback_ops = &nfs4_locku_ops,
3273                 .workqueue = nfsiod_workqueue,
3274                 .flags = RPC_TASK_ASYNC,
3275         };
3276
3277         /* Ensure this is an unlock - when canceling a lock, the
3278          * canceled lock is passed in, and it won't be an unlock.
3279          */
3280         fl->fl_type = F_UNLCK;
3281
3282         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3283         if (data == NULL) {
3284                 nfs_free_seqid(seqid);
3285                 return ERR_PTR(-ENOMEM);
3286         }
3287
3288         msg.rpc_argp = &data->arg,
3289         msg.rpc_resp = &data->res,
3290         task_setup_data.callback_data = data;
3291         return rpc_run_task(&task_setup_data);
3292 }
3293
3294 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3295 {
3296         struct nfs_inode *nfsi = NFS_I(state->inode);
3297         struct nfs_seqid *seqid;
3298         struct nfs4_lock_state *lsp;
3299         struct rpc_task *task;
3300         int status = 0;
3301         unsigned char fl_flags = request->fl_flags;
3302
3303         status = nfs4_set_lock_state(state, request);
3304         /* Unlock _before_ we do the RPC call */
3305         request->fl_flags |= FL_EXISTS;
3306         down_read(&nfsi->rwsem);
3307         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3308                 up_read(&nfsi->rwsem);
3309                 goto out;
3310         }
3311         up_read(&nfsi->rwsem);
3312         if (status != 0)
3313                 goto out;
3314         /* Is this a delegated lock? */
3315         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3316                 goto out;
3317         lsp = request->fl_u.nfs4_fl.owner;
3318         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3319         status = -ENOMEM;
3320         if (seqid == NULL)
3321                 goto out;
3322         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3323         status = PTR_ERR(task);
3324         if (IS_ERR(task))
3325                 goto out;
3326         status = nfs4_wait_for_completion_rpc_task(task);
3327         rpc_put_task(task);
3328 out:
3329         request->fl_flags = fl_flags;
3330         return status;
3331 }
3332
3333 struct nfs4_lockdata {
3334         struct nfs_lock_args arg;
3335         struct nfs_lock_res res;
3336         struct nfs4_lock_state *lsp;
3337         struct nfs_open_context *ctx;
3338         struct file_lock fl;
3339         unsigned long timestamp;
3340         int rpc_status;
3341         int cancelled;
3342 };
3343
3344 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3345                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3346 {
3347         struct nfs4_lockdata *p;
3348         struct inode *inode = lsp->ls_state->inode;
3349         struct nfs_server *server = NFS_SERVER(inode);
3350
3351         p = kzalloc(sizeof(*p), GFP_KERNEL);
3352         if (p == NULL)
3353                 return NULL;
3354
3355         p->arg.fh = NFS_FH(inode);
3356         p->arg.fl = &p->fl;
3357         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3358         if (p->arg.open_seqid == NULL)
3359                 goto out_free;
3360         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3361         if (p->arg.lock_seqid == NULL)
3362                 goto out_free_seqid;
3363         p->arg.lock_stateid = &lsp->ls_stateid;
3364         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3365         p->arg.lock_owner.id = lsp->ls_id.id;
3366         p->res.lock_seqid = p->arg.lock_seqid;
3367         p->lsp = lsp;
3368         atomic_inc(&lsp->ls_count);
3369         p->ctx = get_nfs_open_context(ctx);
3370         memcpy(&p->fl, fl, sizeof(p->fl));
3371         return p;
3372 out_free_seqid:
3373         nfs_free_seqid(p->arg.open_seqid);
3374 out_free:
3375         kfree(p);
3376         return NULL;
3377 }
3378
3379 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3380 {
3381         struct nfs4_lockdata *data = calldata;
3382         struct nfs4_state *state = data->lsp->ls_state;
3383
3384         dprintk("%s: begin!\n", __func__);
3385         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3386                 return;
3387         /* Do we need to do an open_to_lock_owner? */
3388         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3389                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3390                         return;
3391                 data->arg.open_stateid = &state->stateid;
3392                 data->arg.new_lock_owner = 1;
3393                 data->res.open_seqid = data->arg.open_seqid;
3394         } else
3395                 data->arg.new_lock_owner = 0;
3396         data->timestamp = jiffies;
3397         rpc_call_start(task);
3398         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3399 }
3400
3401 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3402 {
3403         struct nfs4_lockdata *data = calldata;
3404
3405         dprintk("%s: begin!\n", __func__);
3406
3407         data->rpc_status = task->tk_status;
3408         if (RPC_ASSASSINATED(task))
3409                 goto out;
3410         if (data->arg.new_lock_owner != 0) {
3411                 if (data->rpc_status == 0)
3412                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3413                 else
3414                         goto out;
3415         }
3416         if (data->rpc_status == 0) {
3417                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3418                                         sizeof(data->lsp->ls_stateid.data));
3419                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3420                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3421         }
3422 out:
3423         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3424 }
3425
3426 static void nfs4_lock_release(void *calldata)
3427 {
3428         struct nfs4_lockdata *data = calldata;
3429
3430         dprintk("%s: begin!\n", __func__);
3431         nfs_free_seqid(data->arg.open_seqid);
3432         if (data->cancelled != 0) {
3433                 struct rpc_task *task;
3434                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3435                                 data->arg.lock_seqid);
3436                 if (!IS_ERR(task))
3437                         rpc_put_task(task);
3438                 dprintk("%s: cancelling lock!\n", __func__);
3439         } else
3440                 nfs_free_seqid(data->arg.lock_seqid);
3441         nfs4_put_lock_state(data->lsp);
3442         put_nfs_open_context(data->ctx);
3443         kfree(data);
3444         dprintk("%s: done!\n", __func__);
3445 }
3446
3447 static const struct rpc_call_ops nfs4_lock_ops = {
3448         .rpc_call_prepare = nfs4_lock_prepare,
3449         .rpc_call_done = nfs4_lock_done,
3450         .rpc_release = nfs4_lock_release,
3451 };
3452
3453 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3454 {
3455         struct nfs4_lockdata *data;
3456         struct rpc_task *task;
3457         struct rpc_message msg = {
3458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3459                 .rpc_cred = state->owner->so_cred,
3460         };
3461         struct rpc_task_setup task_setup_data = {
3462                 .rpc_client = NFS_CLIENT(state->inode),
3463                 .rpc_message = &msg,
3464                 .callback_ops = &nfs4_lock_ops,
3465                 .workqueue = nfsiod_workqueue,
3466                 .flags = RPC_TASK_ASYNC,
3467         };
3468         int ret;
3469
3470         dprintk("%s: begin!\n", __func__);
3471         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3472                         fl->fl_u.nfs4_fl.owner);
3473         if (data == NULL)
3474                 return -ENOMEM;
3475         if (IS_SETLKW(cmd))
3476                 data->arg.block = 1;
3477         if (reclaim != 0)
3478                 data->arg.reclaim = 1;
3479         msg.rpc_argp = &data->arg,
3480         msg.rpc_resp = &data->res,
3481         task_setup_data.callback_data = data;
3482         task = rpc_run_task(&task_setup_data);
3483         if (IS_ERR(task))
3484                 return PTR_ERR(task);
3485         ret = nfs4_wait_for_completion_rpc_task(task);
3486         if (ret == 0) {
3487                 ret = data->rpc_status;
3488                 if (ret == -NFS4ERR_DENIED)
3489                         ret = -EAGAIN;
3490         } else
3491                 data->cancelled = 1;
3492         rpc_put_task(task);
3493         dprintk("%s: done, ret = %d!\n", __func__, ret);
3494         return ret;
3495 }
3496
3497 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3498 {
3499         struct nfs_server *server = NFS_SERVER(state->inode);
3500         struct nfs4_exception exception = { };
3501         int err;
3502
3503         do {
3504                 /* Cache the lock if possible... */
3505                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3506                         return 0;
3507                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3508                 if (err != -NFS4ERR_DELAY)
3509                         break;
3510                 nfs4_handle_exception(server, err, &exception);
3511         } while (exception.retry);
3512         return err;
3513 }
3514
3515 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3516 {
3517         struct nfs_server *server = NFS_SERVER(state->inode);
3518         struct nfs4_exception exception = { };
3519         int err;
3520
3521         err = nfs4_set_lock_state(state, request);
3522         if (err != 0)
3523                 return err;
3524         do {
3525                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3526                         return 0;
3527                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3528                 if (err != -NFS4ERR_DELAY)
3529                         break;
3530                 nfs4_handle_exception(server, err, &exception);
3531         } while (exception.retry);
3532         return err;
3533 }
3534
3535 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3536 {
3537         struct nfs_inode *nfsi = NFS_I(state->inode);
3538         unsigned char fl_flags = request->fl_flags;
3539         int status;
3540
3541         /* Is this a delegated open? */
3542         status = nfs4_set_lock_state(state, request);
3543         if (status != 0)
3544                 goto out;
3545         request->fl_flags |= FL_ACCESS;
3546         status = do_vfs_lock(request->fl_file, request);
3547         if (status < 0)
3548                 goto out;
3549         down_read(&nfsi->rwsem);
3550         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3551                 /* Yes: cache locks! */
3552                 /* ...but avoid races with delegation recall... */
3553                 request->fl_flags = fl_flags & ~FL_SLEEP;
3554                 status = do_vfs_lock(request->fl_file, request);
3555                 goto out_unlock;
3556         }
3557         status = _nfs4_do_setlk(state, cmd, request, 0);
3558         if (status != 0)
3559                 goto out_unlock;
3560         /* Note: we always want to sleep here! */
3561         request->fl_flags = fl_flags | FL_SLEEP;
3562         if (do_vfs_lock(request->fl_file, request) < 0)
3563                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3564 out_unlock:
3565         up_read(&nfsi->rwsem);
3566 out:
3567         request->fl_flags = fl_flags;
3568         return status;
3569 }
3570
3571 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3572 {
3573         struct nfs4_exception exception = { };
3574         int err;
3575
3576         do {
3577                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3578                                 _nfs4_proc_setlk(state, cmd, request),
3579                                 &exception);
3580         } while (exception.retry);
3581         return err;
3582 }
3583
3584 static int
3585 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3586 {
3587         struct nfs_open_context *ctx;
3588         struct nfs4_state *state;
3589         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3590         int status;
3591
3592         /* verify open state */
3593         ctx = nfs_file_open_context(filp);
3594         state = ctx->state;
3595
3596         if (request->fl_start < 0 || request->fl_end < 0)
3597                 return -EINVAL;
3598
3599         if (IS_GETLK(cmd))
3600                 return nfs4_proc_getlk(state, F_GETLK, request);
3601
3602         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3603                 return -EINVAL;
3604
3605         if (request->fl_type == F_UNLCK)
3606                 return nfs4_proc_unlck(state, cmd, request);
3607
3608         do {
3609                 status = nfs4_proc_setlk(state, cmd, request);
3610                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3611                         break;
3612                 timeout = nfs4_set_lock_task_retry(timeout);
3613                 status = -ERESTARTSYS;
3614                 if (signalled())
3615                         break;
3616         } while(status < 0);
3617         return status;
3618 }
3619
3620 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3621 {
3622         struct nfs_server *server = NFS_SERVER(state->inode);
3623         struct nfs4_exception exception = { };
3624         int err;
3625
3626         err = nfs4_set_lock_state(state, fl);
3627         if (err != 0)
3628                 goto out;
3629         do {
3630                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3631                 if (err != -NFS4ERR_DELAY)
3632                         break;
3633                 err = nfs4_handle_exception(server, err, &exception);
3634         } while (exception.retry);
3635 out:
3636         return err;
3637 }
3638
3639 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3640
3641 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3642                 size_t buflen, int flags)
3643 {
3644         struct inode *inode = dentry->d_inode;
3645
3646         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3647                 return -EOPNOTSUPP;
3648
3649         return nfs4_proc_set_acl(inode, buf, buflen);
3650 }
3651
3652 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3653  * and that's what we'll do for e.g. user attributes that haven't been set.
3654  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3655  * attributes in kernel-managed attribute namespaces. */
3656 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3657                 size_t buflen)
3658 {
3659         struct inode *inode = dentry->d_inode;
3660
3661         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3662                 return -EOPNOTSUPP;
3663
3664         return nfs4_proc_get_acl(inode, buf, buflen);
3665 }
3666
3667 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3668 {
3669         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3670
3671         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3672                 return 0;
3673         if (buf && buflen < len)
3674                 return -ERANGE;
3675         if (buf)
3676                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3677         return len;
3678 }
3679
3680 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3681                 struct nfs4_fs_locations *fs_locations, struct page *page)
3682 {
3683         struct nfs_server *server = NFS_SERVER(dir);
3684         u32 bitmask[2] = {
3685                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3686                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3687         };
3688         struct nfs4_fs_locations_arg args = {
3689                 .dir_fh = NFS_FH(dir),
3690                 .name = name,
3691                 .page = page,
3692                 .bitmask = bitmask,
3693         };
3694         struct rpc_message msg = {
3695                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3696                 .rpc_argp = &args,
3697                 .rpc_resp = fs_locations,
3698         };
3699         int status;
3700
3701         dprintk("%s: start\n", __func__);
3702         nfs_fattr_init(&fs_locations->fattr);
3703         fs_locations->server = server;
3704         fs_locations->nlocations = 0;
3705         status = rpc_call_sync(server->client, &msg, 0);
3706         dprintk("%s: returned status = %d\n", __func__, status);
3707         return status;
3708 }
3709
3710 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3711         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
3712         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
3713         .recover_open   = nfs4_open_reclaim,
3714         .recover_lock   = nfs4_lock_reclaim,
3715 };
3716
3717 struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
3718         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
3719         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
3720         .recover_open   = nfs4_open_expired,
3721         .recover_lock   = nfs4_lock_expired,
3722 };
3723
3724 static const struct inode_operations nfs4_file_inode_operations = {
3725         .permission     = nfs_permission,
3726         .getattr        = nfs_getattr,
3727         .setattr        = nfs_setattr,
3728         .getxattr       = nfs4_getxattr,
3729         .setxattr       = nfs4_setxattr,
3730         .listxattr      = nfs4_listxattr,
3731 };
3732
3733 const struct nfs_rpc_ops nfs_v4_clientops = {
3734         .version        = 4,                    /* protocol version */
3735         .dentry_ops     = &nfs4_dentry_operations,
3736         .dir_inode_ops  = &nfs4_dir_inode_operations,
3737         .file_inode_ops = &nfs4_file_inode_operations,
3738         .getroot        = nfs4_proc_get_root,
3739         .getattr        = nfs4_proc_getattr,
3740         .setattr        = nfs4_proc_setattr,
3741         .lookupfh       = nfs4_proc_lookupfh,
3742         .lookup         = nfs4_proc_lookup,
3743         .access         = nfs4_proc_access,
3744         .readlink       = nfs4_proc_readlink,
3745         .create         = nfs4_proc_create,
3746         .remove         = nfs4_proc_remove,
3747         .unlink_setup   = nfs4_proc_unlink_setup,
3748         .unlink_done    = nfs4_proc_unlink_done,
3749         .rename         = nfs4_proc_rename,
3750         .link           = nfs4_proc_link,
3751         .symlink        = nfs4_proc_symlink,
3752         .mkdir          = nfs4_proc_mkdir,
3753         .rmdir          = nfs4_proc_remove,
3754         .readdir        = nfs4_proc_readdir,
3755         .mknod          = nfs4_proc_mknod,
3756         .statfs         = nfs4_proc_statfs,
3757         .fsinfo         = nfs4_proc_fsinfo,
3758         .pathconf       = nfs4_proc_pathconf,
3759         .set_capabilities = nfs4_server_capabilities,
3760         .decode_dirent  = nfs4_decode_dirent,
3761         .read_setup     = nfs4_proc_read_setup,
3762         .read_done      = nfs4_read_done,
3763         .write_setup    = nfs4_proc_write_setup,
3764         .write_done     = nfs4_write_done,
3765         .commit_setup   = nfs4_proc_commit_setup,
3766         .commit_done    = nfs4_commit_done,
3767         .lock           = nfs4_proc_lock,
3768         .clear_acl_cache = nfs4_zap_acl_attr,
3769 };
3770
3771 /*
3772  * Local variables:
3773  *  c-basic-offset: 8
3774  * End:
3775  */