fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  66 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  67 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 static int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __func__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 197 {
 198         int res;
 199
 200         might_sleep();
 201
 202         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 203                         nfs_wait_bit_killable, TASK_KILLABLE);
 204         return res;
 205 }
 206
 207 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 208 {
 209         int res = 0;
 210
 211         might_sleep();
 212
 213         if (*timeout <= 0)
 214                 *timeout = NFS4_POLL_RETRY_MIN;
 215         if (*timeout > NFS4_POLL_RETRY_MAX)
 216                 *timeout = NFS4_POLL_RETRY_MAX;
 217         schedule_timeout_killable(*timeout);
 218         if (fatal_signal_pending(current))
 219                 res = -ERESTARTSYS;
 220         *timeout <<= 1;
 221         return res;
 222 }
 223
 224 /* This is the error handling routine for processes that are allowed
 225  * to sleep.
 226  */
 227 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 228 {
 229         struct nfs_client *clp = server->nfs_client;
 230         struct nfs4_state *state = exception->state;
 231         int ret = errorcode;
 232
 233         exception->retry = 0;
 234         switch(errorcode) {
 235                 case 0:
 236                         return 0;
 237                 case -NFS4ERR_ADMIN_REVOKED:
 238                 case -NFS4ERR_BAD_STATEID:
 239                 case -NFS4ERR_OPENMODE:
 240                         if (state == NULL)
 241                                 break;
 242                         nfs4_state_mark_reclaim_nograce(clp, state);
 243                 case -NFS4ERR_STALE_CLIENTID:
 244                 case -NFS4ERR_STALE_STATEID:
 245                 case -NFS4ERR_EXPIRED:
 246                         nfs4_schedule_state_recovery(clp);
 247                         ret = nfs4_wait_clnt_recover(clp);
 248                         if (ret == 0)
 249                                 exception->retry = 1;
 250                         break;
 251                 case -NFS4ERR_FILE_OPEN:
 252                 case -NFS4ERR_GRACE:
 253                 case -NFS4ERR_DELAY:
 254                         ret = nfs4_delay(server->client, &exception->timeout);
 255                         if (ret != 0)
 256                                 break;
 257                 case -NFS4ERR_OLD_STATEID:
 258                         exception->retry = 1;
 259         }
 260         /* We failed to handle the error */
 261         return nfs4_map_errors(ret);
 262 }
 263
 264
 265 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 266 {
 267         struct nfs_client *clp = server->nfs_client;
 268         spin_lock(&clp->cl_lock);
 269         if (time_before(clp->cl_last_renewal,timestamp))
 270                 clp->cl_last_renewal = timestamp;
 271         spin_unlock(&clp->cl_lock);
 272 }
 273
 274 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 275 {
 276         struct nfs_inode *nfsi = NFS_I(dir);
 277
 278         spin_lock(&dir->i_lock);
 279         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 280         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 281                 nfs_force_lookup_revalidate(dir);
 282         nfsi->change_attr = cinfo->after;
 283         spin_unlock(&dir->i_lock);
 284 }
 285
 286 struct nfs4_opendata {
 287         struct kref kref;
 288         struct nfs_openargs o_arg;
 289         struct nfs_openres o_res;
 290         struct nfs_open_confirmargs c_arg;
 291         struct nfs_open_confirmres c_res;
 292         struct nfs_fattr f_attr;
 293         struct nfs_fattr dir_attr;
 294         struct path path;
 295         struct dentry *dir;
 296         struct nfs4_state_owner *owner;
 297         struct nfs4_state *state;
 298         struct iattr attrs;
 299         unsigned long timestamp;
 300         unsigned int rpc_done : 1;
 301         int rpc_status;
 302         int cancelled;
 303 };
 304
 305
 306 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 307 {
 308         p->o_res.f_attr = &p->f_attr;
 309         p->o_res.dir_attr = &p->dir_attr;
 310         p->o_res.seqid = p->o_arg.seqid;
 311         p->c_res.seqid = p->c_arg.seqid;
 312         p->o_res.server = p->o_arg.server;
 313         nfs_fattr_init(&p->f_attr);
 314         nfs_fattr_init(&p->dir_attr);
 315 }
 316
 317 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 318                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 319                 const struct iattr *attrs)
 320 {
 321         struct dentry *parent = dget_parent(path->dentry);
 322         struct inode *dir = parent->d_inode;
 323         struct nfs_server *server = NFS_SERVER(dir);
 324         struct nfs4_opendata *p;
 325
 326         p = kzalloc(sizeof(*p), GFP_KERNEL);
 327         if (p == NULL)
 328                 goto err;
 329         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 330         if (p->o_arg.seqid == NULL)
 331                 goto err_free;
 332         p->path.mnt = mntget(path->mnt);
 333         p->path.dentry = dget(path->dentry);
 334         p->dir = parent;
 335         p->owner = sp;
 336         atomic_inc(&sp->so_count);
 337         p->o_arg.fh = NFS_FH(dir);
 338         p->o_arg.open_flags = flags;
 339         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 340         p->o_arg.clientid = server->nfs_client->cl_clientid;
 341         p->o_arg.id = sp->so_owner_id.id;
 342         p->o_arg.name = &p->path.dentry->d_name;
 343         p->o_arg.server = server;
 344         p->o_arg.bitmask = server->attr_bitmask;
 345         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 346         if (flags & O_EXCL) {
 347                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 348                 s[0] = jiffies;
 349                 s[1] = current->pid;
 350         } else if (flags & O_CREAT) {
 351                 p->o_arg.u.attrs = &p->attrs;
 352                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 353         }
 354         p->c_arg.fh = &p->o_res.fh;
 355         p->c_arg.stateid = &p->o_res.stateid;
 356         p->c_arg.seqid = p->o_arg.seqid;
 357         nfs4_init_opendata_res(p);
 358         kref_init(&p->kref);
 359         return p;
 360 err_free:
 361         kfree(p);
 362 err:
 363         dput(parent);
 364         return NULL;
 365 }
 366
 367 static void nfs4_opendata_free(struct kref *kref)
 368 {
 369         struct nfs4_opendata *p = container_of(kref,
 370                         struct nfs4_opendata, kref);
 371
 372         nfs_free_seqid(p->o_arg.seqid);
 373         if (p->state != NULL)
 374                 nfs4_put_open_state(p->state);
 375         nfs4_put_state_owner(p->owner);
 376         dput(p->dir);
 377         path_put(&p->path);
 378         kfree(p);
 379 }
 380
 381 static void nfs4_opendata_put(struct nfs4_opendata *p)
 382 {
 383         if (p != NULL)
 384                 kref_put(&p->kref, nfs4_opendata_free);
 385 }
 386
 387 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 388 {
 389         int ret;
 390
 391         ret = rpc_wait_for_completion_task(task);
 392         return ret;
 393 }
 394
 395 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 396 {
 397         int ret = 0;
 398
 399         if (open_mode & O_EXCL)
 400                 goto out;
 401         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 402                 case FMODE_READ:
 403                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 404                         break;
 405                 case FMODE_WRITE:
 406                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 407                         break;
 408                 case FMODE_READ|FMODE_WRITE:
 409                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 410         }
 411 out:
 412         return ret;
 413 }
 414
 415 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 416 {
 417         if ((delegation->type & fmode) != fmode)
 418                 return 0;
 419         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 420                 return 0;
 421         nfs_mark_delegation_referenced(delegation);
 422         return 1;
 423 }
 424
 425 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 426 {
 427         switch (fmode) {
 428                 case FMODE_WRITE:
 429                         state->n_wronly++;
 430                         break;
 431                 case FMODE_READ:
 432                         state->n_rdonly++;
 433                         break;
 434                 case FMODE_READ|FMODE_WRITE:
 435                         state->n_rdwr++;
 436         }
 437         nfs4_state_set_mode_locked(state, state->state | fmode);
 438 }
 439
 440 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 441 {
 442         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 443                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 444         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 445         switch (fmode) {
 446                 case FMODE_READ:
 447                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 448                         break;
 449                 case FMODE_WRITE:
 450                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 451                         break;
 452                 case FMODE_READ|FMODE_WRITE:
 453                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 454         }
 455 }
 456
 457 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 458 {
 459         write_seqlock(&state->seqlock);
 460         nfs_set_open_stateid_locked(state, stateid, fmode);
 461         write_sequnlock(&state->seqlock);
 462 }
 463
 464 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 465 {
 466         /*
 467          * Protect the call to nfs4_state_set_mode_locked and
 468          * serialise the stateid update
 469          */
 470         write_seqlock(&state->seqlock);
 471         if (deleg_stateid != NULL) {
 472                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 473                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 474         }
 475         if (open_stateid != NULL)
 476                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 477         write_sequnlock(&state->seqlock);
 478         spin_lock(&state->owner->so_lock);
 479         update_open_stateflags(state, fmode);
 480         spin_unlock(&state->owner->so_lock);
 481 }
 482
 483 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 484 {
 485         struct nfs_inode *nfsi = NFS_I(state->inode);
 486         struct nfs_delegation *deleg_cur;
 487         int ret = 0;
 488
 489         fmode &= (FMODE_READ|FMODE_WRITE);
 490
 491         rcu_read_lock();
 492         deleg_cur = rcu_dereference(nfsi->delegation);
 493         if (deleg_cur == NULL)
 494                 goto no_delegation;
 495
 496         spin_lock(&deleg_cur->lock);
 497         if (nfsi->delegation != deleg_cur ||
 498             (deleg_cur->type & fmode) != fmode)
 499                 goto no_delegation_unlock;
 500
 501         if (delegation == NULL)
 502                 delegation = &deleg_cur->stateid;
 503         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 504                 goto no_delegation_unlock;
 505
 506         nfs_mark_delegation_referenced(deleg_cur);
 507         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 508         ret = 1;
 509 no_delegation_unlock:
 510         spin_unlock(&deleg_cur->lock);
 511 no_delegation:
 512         rcu_read_unlock();
 513
 514         if (!ret && open_stateid != NULL) {
 515                 __update_open_stateid(state, open_stateid, NULL, fmode);
 516                 ret = 1;
 517         }
 518
 519         return ret;
 520 }
 521
 522
 523 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 524 {
 525         struct nfs_delegation *delegation;
 526
 527         rcu_read_lock();
 528         delegation = rcu_dereference(NFS_I(inode)->delegation);
 529         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 530                 rcu_read_unlock();
 531                 return;
 532         }
 533         rcu_read_unlock();
 534         nfs_inode_return_delegation(inode);
 535 }
 536
 537 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 538 {
 539         struct nfs4_state *state = opendata->state;
 540         struct nfs_inode *nfsi = NFS_I(state->inode);
 541         struct nfs_delegation *delegation;
 542         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 543         fmode_t fmode = opendata->o_arg.fmode;
 544         nfs4_stateid stateid;
 545         int ret = -EAGAIN;
 546
 547         for (;;) {
 548                 if (can_open_cached(state, fmode, open_mode)) {
 549                         spin_lock(&state->owner->so_lock);
 550                         if (can_open_cached(state, fmode, open_mode)) {
 551                                 update_open_stateflags(state, fmode);
 552                                 spin_unlock(&state->owner->so_lock);
 553                                 goto out_return_state;
 554                         }
 555                         spin_unlock(&state->owner->so_lock);
 556                 }
 557                 rcu_read_lock();
 558                 delegation = rcu_dereference(nfsi->delegation);
 559                 if (delegation == NULL ||
 560                     !can_open_delegated(delegation, fmode)) {
 561                         rcu_read_unlock();
 562                         break;
 563                 }
 564                 /* Save the delegation */
 565                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 566                 rcu_read_unlock();
 567                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 568                 if (ret != 0)
 569                         goto out;
 570                 ret = -EAGAIN;
 571
 572                 /* Try to update the stateid using the delegation */
 573                 if (update_open_stateid(state, NULL, &stateid, fmode))
 574                         goto out_return_state;
 575         }
 576 out:
 577         return ERR_PTR(ret);
 578 out_return_state:
 579         atomic_inc(&state->count);
 580         return state;
 581 }
 582
 583 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 584 {
 585         struct inode *inode;
 586         struct nfs4_state *state = NULL;
 587         struct nfs_delegation *delegation;
 588         int ret;
 589
 590         if (!data->rpc_done) {
 591                 state = nfs4_try_open_cached(data);
 592                 goto out;
 593         }
 594
 595         ret = -EAGAIN;
 596         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 597                 goto err;
 598         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 599         ret = PTR_ERR(inode);
 600         if (IS_ERR(inode))
 601                 goto err;
 602         ret = -ENOMEM;
 603         state = nfs4_get_open_state(inode, data->owner);
 604         if (state == NULL)
 605                 goto err_put_inode;
 606         if (data->o_res.delegation_type != 0) {
 607                 int delegation_flags = 0;
 608
 609                 rcu_read_lock();
 610                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 611                 if (delegation)
 612                         delegation_flags = delegation->flags;
 613                 rcu_read_unlock();
 614                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 615                         nfs_inode_set_delegation(state->inode,
 616                                         data->owner->so_cred,
 617                                         &data->o_res);
 618                 else
 619                         nfs_inode_reclaim_delegation(state->inode,
 620                                         data->owner->so_cred,
 621                                         &data->o_res);
 622         }
 623
 624         update_open_stateid(state, &data->o_res.stateid, NULL,
 625                         data->o_arg.fmode);
 626         iput(inode);
 627 out:
 628         return state;
 629 err_put_inode:
 630         iput(inode);
 631 err:
 632         return ERR_PTR(ret);
 633 }
 634
 635 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 636 {
 637         struct nfs_inode *nfsi = NFS_I(state->inode);
 638         struct nfs_open_context *ctx;
 639
 640         spin_lock(&state->inode->i_lock);
 641         list_for_each_entry(ctx, &nfsi->open_files, list) {
 642                 if (ctx->state != state)
 643                         continue;
 644                 get_nfs_open_context(ctx);
 645                 spin_unlock(&state->inode->i_lock);
 646                 return ctx;
 647         }
 648         spin_unlock(&state->inode->i_lock);
 649         return ERR_PTR(-ENOENT);
 650 }
 651
 652 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 653 {
 654         struct nfs4_opendata *opendata;
 655
 656         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
 657         if (opendata == NULL)
 658                 return ERR_PTR(-ENOMEM);
 659         opendata->state = state;
 660         atomic_inc(&state->count);
 661         return opendata;
 662 }
 663
 664 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
 665 {
 666         struct nfs4_state *newstate;
 667         int ret;
 668
 669         opendata->o_arg.open_flags = 0;
 670         opendata->o_arg.fmode = fmode;
 671         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 672         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 673         nfs4_init_opendata_res(opendata);
 674         ret = _nfs4_proc_open(opendata);
 675         if (ret != 0)
 676                 return ret;
 677         newstate = nfs4_opendata_to_nfs4_state(opendata);
 678         if (IS_ERR(newstate))
 679                 return PTR_ERR(newstate);
 680         nfs4_close_state(&opendata->path, newstate, fmode);
 681         *res = newstate;
 682         return 0;
 683 }
 684
 685 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 686 {
 687         struct nfs4_state *newstate;
 688         int ret;
 689
 690         /* memory barrier prior to reading state->n_* */
 691         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 692         smp_rmb();
 693         if (state->n_rdwr != 0) {
 694                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 695                 if (ret != 0)
 696                         return ret;
 697                 if (newstate != state)
 698                         return -ESTALE;
 699         }
 700         if (state->n_wronly != 0) {
 701                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 702                 if (ret != 0)
 703                         return ret;
 704                 if (newstate != state)
 705                         return -ESTALE;
 706         }
 707         if (state->n_rdonly != 0) {
 708                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 709                 if (ret != 0)
 710                         return ret;
 711                 if (newstate != state)
 712                         return -ESTALE;
 713         }
 714         /*
 715          * We may have performed cached opens for all three recoveries.
 716          * Check if we need to update the current stateid.
 717          */
 718         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 719             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 720                 write_seqlock(&state->seqlock);
 721                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 722                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 723                 write_sequnlock(&state->seqlock);
 724         }
 725         return 0;
 726 }
 727
 728 /*
 729  * OPEN_RECLAIM:
 730  *      reclaim state on the server after a reboot.
 731  */
 732 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 733 {
 734         struct nfs_delegation *delegation;
 735         struct nfs4_opendata *opendata;
 736         fmode_t delegation_type = 0;
 737         int status;
 738
 739         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 740         if (IS_ERR(opendata))
 741                 return PTR_ERR(opendata);
 742         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 743         opendata->o_arg.fh = NFS_FH(state->inode);
 744         rcu_read_lock();
 745         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 746         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
 747                 delegation_type = delegation->type;
 748         rcu_read_unlock();
 749         opendata->o_arg.u.delegation_type = delegation_type;
 750         status = nfs4_open_recover(opendata, state);
 751         nfs4_opendata_put(opendata);
 752         return status;
 753 }
 754
 755 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 756 {
 757         struct nfs_server *server = NFS_SERVER(state->inode);
 758         struct nfs4_exception exception = { };
 759         int err;
 760         do {
 761                 err = _nfs4_do_open_reclaim(ctx, state);
 762                 if (err != -NFS4ERR_DELAY)
 763                         break;
 764                 nfs4_handle_exception(server, err, &exception);
 765         } while (exception.retry);
 766         return err;
 767 }
 768
 769 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 770 {
 771         struct nfs_open_context *ctx;
 772         int ret;
 773
 774         ctx = nfs4_state_find_open_context(state);
 775         if (IS_ERR(ctx))
 776                 return PTR_ERR(ctx);
 777         ret = nfs4_do_open_reclaim(ctx, state);
 778         put_nfs_open_context(ctx);
 779         return ret;
 780 }
 781
 782 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 783 {
 784         struct nfs4_opendata *opendata;
 785         int ret;
 786
 787         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 788         if (IS_ERR(opendata))
 789                 return PTR_ERR(opendata);
 790         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 791         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 792                         sizeof(opendata->o_arg.u.delegation.data));
 793         ret = nfs4_open_recover(opendata, state);
 794         nfs4_opendata_put(opendata);
 795         return ret;
 796 }
 797
 798 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 799 {
 800         struct nfs4_exception exception = { };
 801         struct nfs_server *server = NFS_SERVER(state->inode);
 802         int err;
 803         do {
 804                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 805                 switch (err) {
 806                         case 0:
 807                         case -ENOENT:
 808                         case -ESTALE:
 809                                 goto out;
 810                         case -NFS4ERR_STALE_CLIENTID:
 811                         case -NFS4ERR_STALE_STATEID:
 812                         case -NFS4ERR_EXPIRED:
 813                                 /* Don't recall a delegation if it was lost */
 814                                 nfs4_schedule_state_recovery(server->nfs_client);
 815                                 goto out;
 816                         case -ERESTARTSYS:
 817                                 /*
 818                                  * The show must go on: exit, but mark the
 819                                  * stateid as needing recovery.
 820                                  */
 821                         case -NFS4ERR_ADMIN_REVOKED:
 822                         case -NFS4ERR_BAD_STATEID:
 823                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
 824                         case -ENOMEM:
 825                                 err = 0;
 826                                 goto out;
 827                 }
 828                 err = nfs4_handle_exception(server, err, &exception);
 829         } while (exception.retry);
 830 out:
 831         return err;
 832 }
 833
 834 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 835 {
 836         struct nfs4_opendata *data = calldata;
 837
 838         data->rpc_status = task->tk_status;
 839         if (RPC_ASSASSINATED(task))
 840                 return;
 841         if (data->rpc_status == 0) {
 842                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 843                                 sizeof(data->o_res.stateid.data));
 844                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 845                 renew_lease(data->o_res.server, data->timestamp);
 846                 data->rpc_done = 1;
 847         }
 848 }
 849
 850 static void nfs4_open_confirm_release(void *calldata)
 851 {
 852         struct nfs4_opendata *data = calldata;
 853         struct nfs4_state *state = NULL;
 854
 855         /* If this request hasn't been cancelled, do nothing */
 856         if (data->cancelled == 0)
 857                 goto out_free;
 858         /* In case of error, no cleanup! */
 859         if (!data->rpc_done)
 860                 goto out_free;
 861         state = nfs4_opendata_to_nfs4_state(data);
 862         if (!IS_ERR(state))
 863                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 864 out_free:
 865         nfs4_opendata_put(data);
 866 }
 867
 868 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 869         .rpc_call_done = nfs4_open_confirm_done,
 870         .rpc_release = nfs4_open_confirm_release,
 871 };
 872
 873 /*
 874  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 875  */
 876 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 877 {
 878         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 879         struct rpc_task *task;
 880         struct  rpc_message msg = {
 881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 882                 .rpc_argp = &data->c_arg,
 883                 .rpc_resp = &data->c_res,
 884                 .rpc_cred = data->owner->so_cred,
 885         };
 886         struct rpc_task_setup task_setup_data = {
 887                 .rpc_client = server->client,
 888                 .rpc_message = &msg,
 889                 .callback_ops = &nfs4_open_confirm_ops,
 890                 .callback_data = data,
 891                 .workqueue = nfsiod_workqueue,
 892                 .flags = RPC_TASK_ASYNC,
 893         };
 894         int status;
 895
 896         kref_get(&data->kref);
 897         data->rpc_done = 0;
 898         data->rpc_status = 0;
 899         data->timestamp = jiffies;
 900         task = rpc_run_task(&task_setup_data);
 901         if (IS_ERR(task))
 902                 return PTR_ERR(task);
 903         status = nfs4_wait_for_completion_rpc_task(task);
 904         if (status != 0) {
 905                 data->cancelled = 1;
 906                 smp_wmb();
 907         } else
 908                 status = data->rpc_status;
 909         rpc_put_task(task);
 910         return status;
 911 }
 912
 913 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 914 {
 915         struct nfs4_opendata *data = calldata;
 916         struct nfs4_state_owner *sp = data->owner;
 917
 918         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 919                 return;
 920         /*
 921          * Check if we still need to send an OPEN call, or if we can use
 922          * a delegation instead.
 923          */
 924         if (data->state != NULL) {
 925                 struct nfs_delegation *delegation;
 926
 927                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
 928                         goto out_no_action;
 929                 rcu_read_lock();
 930                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 931                 if (delegation != NULL &&
 932                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
 933                         rcu_read_unlock();
 934                         goto out_no_action;
 935                 }
 936                 rcu_read_unlock();
 937         }
 938         /* Update sequence id. */
 939         data->o_arg.id = sp->so_owner_id.id;
 940         data->o_arg.clientid = sp->so_client->cl_clientid;
 941         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 942                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 943                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 944         }
 945         data->timestamp = jiffies;
 946         rpc_call_start(task);
 947         return;
 948 out_no_action:
 949         task->tk_action = NULL;
 950
 951 }
 952
 953 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 954 {
 955         struct nfs4_opendata *data = calldata;
 956
 957         data->rpc_status = task->tk_status;
 958         if (RPC_ASSASSINATED(task))
 959                 return;
 960         if (task->tk_status == 0) {
 961                 switch (data->o_res.f_attr->mode & S_IFMT) {
 962                         case S_IFREG:
 963                                 break;
 964                         case S_IFLNK:
 965                                 data->rpc_status = -ELOOP;
 966                                 break;
 967                         case S_IFDIR:
 968                                 data->rpc_status = -EISDIR;
 969                                 break;
 970                         default:
 971                                 data->rpc_status = -ENOTDIR;
 972                 }
 973                 renew_lease(data->o_res.server, data->timestamp);
 974                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 975                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 976         }
 977         data->rpc_done = 1;
 978 }
 979
 980 static void nfs4_open_release(void *calldata)
 981 {
 982         struct nfs4_opendata *data = calldata;
 983         struct nfs4_state *state = NULL;
 984
 985         /* If this request hasn't been cancelled, do nothing */
 986         if (data->cancelled == 0)
 987                 goto out_free;
 988         /* In case of error, no cleanup! */
 989         if (data->rpc_status != 0 || !data->rpc_done)
 990                 goto out_free;
 991         /* In case we need an open_confirm, no cleanup! */
 992         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 993                 goto out_free;
 994         state = nfs4_opendata_to_nfs4_state(data);
 995         if (!IS_ERR(state))
 996                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 997 out_free:
 998         nfs4_opendata_put(data);
 999 }
1000
1001 static const struct rpc_call_ops nfs4_open_ops = {
1002         .rpc_call_prepare = nfs4_open_prepare,
1003         .rpc_call_done = nfs4_open_done,
1004         .rpc_release = nfs4_open_release,
1005 };
1006
1007 /*
1008  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1009  */
1010 static int _nfs4_proc_open(struct nfs4_opendata *data)
1011 {
1012         struct inode *dir = data->dir->d_inode;
1013         struct nfs_server *server = NFS_SERVER(dir);
1014         struct nfs_openargs *o_arg = &data->o_arg;
1015         struct nfs_openres *o_res = &data->o_res;
1016         struct rpc_task *task;
1017         struct rpc_message msg = {
1018                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1019                 .rpc_argp = o_arg,
1020                 .rpc_resp = o_res,
1021                 .rpc_cred = data->owner->so_cred,
1022         };
1023         struct rpc_task_setup task_setup_data = {
1024                 .rpc_client = server->client,
1025                 .rpc_message = &msg,
1026                 .callback_ops = &nfs4_open_ops,
1027                 .callback_data = data,
1028                 .workqueue = nfsiod_workqueue,
1029                 .flags = RPC_TASK_ASYNC,
1030         };
1031         int status;
1032
1033         kref_get(&data->kref);
1034         data->rpc_done = 0;
1035         data->rpc_status = 0;
1036         data->cancelled = 0;
1037         task = rpc_run_task(&task_setup_data);
1038         if (IS_ERR(task))
1039                 return PTR_ERR(task);
1040         status = nfs4_wait_for_completion_rpc_task(task);
1041         if (status != 0) {
1042                 data->cancelled = 1;
1043                 smp_wmb();
1044         } else
1045                 status = data->rpc_status;
1046         rpc_put_task(task);
1047         if (status != 0 || !data->rpc_done)
1048                 return status;
1049
1050         if (o_res->fh.size == 0)
1051                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1052
1053         if (o_arg->open_flags & O_CREAT) {
1054                 update_changeattr(dir, &o_res->cinfo);
1055                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1056         } else
1057                 nfs_refresh_inode(dir, o_res->dir_attr);
1058         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1059                 status = _nfs4_proc_open_confirm(data);
1060                 if (status != 0)
1061                         return status;
1062         }
1063         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1064                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1065         return 0;
1066 }
1067
1068 static int nfs4_recover_expired_lease(struct nfs_server *server)
1069 {
1070         struct nfs_client *clp = server->nfs_client;
1071         int ret;
1072
1073         for (;;) {
1074                 ret = nfs4_wait_clnt_recover(clp);
1075                 if (ret != 0)
1076                         return ret;
1077                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1078                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1079                         break;
1080                 nfs4_schedule_state_recovery(clp);
1081         }
1082         return 0;
1083 }
1084
1085 /*
1086  * OPEN_EXPIRED:
1087  *      reclaim state on the server after a network partition.
1088  *      Assumes caller holds the appropriate lock
1089  */
1090 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1091 {
1092         struct nfs4_opendata *opendata;
1093         int ret;
1094
1095         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1096         if (IS_ERR(opendata))
1097                 return PTR_ERR(opendata);
1098         ret = nfs4_open_recover(opendata, state);
1099         if (ret == -ESTALE)
1100                 d_drop(ctx->path.dentry);
1101         nfs4_opendata_put(opendata);
1102         return ret;
1103 }
1104
1105 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1106 {
1107         struct nfs_server *server = NFS_SERVER(state->inode);
1108         struct nfs4_exception exception = { };
1109         int err;
1110
1111         do {
1112                 err = _nfs4_open_expired(ctx, state);
1113                 if (err != -NFS4ERR_DELAY)
1114                         break;
1115                 nfs4_handle_exception(server, err, &exception);
1116         } while (exception.retry);
1117         return err;
1118 }
1119
1120 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1121 {
1122         struct nfs_open_context *ctx;
1123         int ret;
1124
1125         ctx = nfs4_state_find_open_context(state);
1126         if (IS_ERR(ctx))
1127                 return PTR_ERR(ctx);
1128         ret = nfs4_do_open_expired(ctx, state);
1129         put_nfs_open_context(ctx);
1130         return ret;
1131 }
1132
1133 /*
1134  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1135  * fields corresponding to attributes that were used to store the verifier.
1136  * Make sure we clobber those fields in the later setattr call
1137  */
1138 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1139 {
1140         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1141             !(sattr->ia_valid & ATTR_ATIME_SET))
1142                 sattr->ia_valid |= ATTR_ATIME;
1143
1144         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1145             !(sattr->ia_valid & ATTR_MTIME_SET))
1146                 sattr->ia_valid |= ATTR_MTIME;
1147 }
1148
1149 /*
1150  * Returns a referenced nfs4_state
1151  */
1152 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)
1153 {
1154         struct nfs4_state_owner  *sp;
1155         struct nfs4_state     *state = NULL;
1156         struct nfs_server       *server = NFS_SERVER(dir);
1157         struct nfs4_opendata *opendata;
1158         int status;
1159
1160         /* Protect against reboot recovery conflicts */
1161         status = -ENOMEM;
1162         if (!(sp = nfs4_get_state_owner(server, cred))) {
1163                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1164                 goto out_err;
1165         }
1166         status = nfs4_recover_expired_lease(server);
1167         if (status != 0)
1168                 goto err_put_state_owner;
1169         if (path->dentry->d_inode != NULL)
1170                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1171         status = -ENOMEM;
1172         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1173         if (opendata == NULL)
1174                 goto err_put_state_owner;
1175
1176         if (path->dentry->d_inode != NULL)
1177                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1178
1179         status = _nfs4_proc_open(opendata);
1180         if (status != 0)
1181                 goto err_opendata_put;
1182
1183         if (opendata->o_arg.open_flags & O_EXCL)
1184                 nfs4_exclusive_attrset(opendata, sattr);
1185
1186         state = nfs4_opendata_to_nfs4_state(opendata);
1187         status = PTR_ERR(state);
1188         if (IS_ERR(state))
1189                 goto err_opendata_put;
1190         nfs4_opendata_put(opendata);
1191         nfs4_put_state_owner(sp);
1192         *res = state;
1193         return 0;
1194 err_opendata_put:
1195         nfs4_opendata_put(opendata);
1196 err_put_state_owner:
1197         nfs4_put_state_owner(sp);
1198 out_err:
1199         *res = NULL;
1200         return status;
1201 }
1202
1203
1204 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)
1205 {
1206         struct nfs4_exception exception = { };
1207         struct nfs4_state *res;
1208         int status;
1209
1210         do {
1211                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1212                 if (status == 0)
1213                         break;
1214                 /* NOTE: BAD_SEQID means the server and client disagree about the
1215                  * book-keeping w.r.t. state-changing operations
1216                  * (OPEN/CLOSE/LOCK/LOCKU...)
1217                  * It is actually a sign of a bug on the client or on the server.
1218                  *
1219                  * If we receive a BAD_SEQID error in the particular case of
1220                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1221                  * have unhashed the old state_owner for us, and that we can
1222                  * therefore safely retry using a new one. We should still warn
1223                  * the user though...
1224                  */
1225                 if (status == -NFS4ERR_BAD_SEQID) {
1226                         printk(KERN_WARNING "NFS: v4 server %s "
1227                                         " returned a bad sequence-id error!\n",
1228                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1229                         exception.retry = 1;
1230                         continue;
1231                 }
1232                 /*
1233                  * BAD_STATEID on OPEN means that the server cancelled our
1234                  * state before it received the OPEN_CONFIRM.
1235                  * Recover by retrying the request as per the discussion
1236                  * on Page 181 of RFC3530.
1237                  */
1238                 if (status == -NFS4ERR_BAD_STATEID) {
1239                         exception.retry = 1;
1240                         continue;
1241                 }
1242                 if (status == -EAGAIN) {
1243                         /* We must have found a delegation */
1244                         exception.retry = 1;
1245                         continue;
1246                 }
1247                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1248                                         status, &exception));
1249         } while (exception.retry);
1250         return res;
1251 }
1252
1253 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1254                             struct nfs_fattr *fattr, struct iattr *sattr,
1255                             struct nfs4_state *state)
1256 {
1257         struct nfs_server *server = NFS_SERVER(inode);
1258         struct nfs_setattrargs  arg = {
1259                 .fh             = NFS_FH(inode),
1260                 .iap            = sattr,
1261                 .server         = server,
1262                 .bitmask = server->attr_bitmask,
1263         };
1264         struct nfs_setattrres  res = {
1265                 .fattr          = fattr,
1266                 .server         = server,
1267         };
1268         struct rpc_message msg = {
1269                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1270                 .rpc_argp       = &arg,
1271                 .rpc_resp       = &res,
1272                 .rpc_cred       = cred,
1273         };
1274         unsigned long timestamp = jiffies;
1275         int status;
1276
1277         nfs_fattr_init(fattr);
1278
1279         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1280                 /* Use that stateid */
1281         } else if (state != NULL) {
1282                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1283         } else
1284                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1285
1286         status = rpc_call_sync(server->client, &msg, 0);
1287         if (status == 0 && state != NULL)
1288                 renew_lease(server, timestamp);
1289         return status;
1290 }
1291
1292 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1293                            struct nfs_fattr *fattr, struct iattr *sattr,
1294                            struct nfs4_state *state)
1295 {
1296         struct nfs_server *server = NFS_SERVER(inode);
1297         struct nfs4_exception exception = { };
1298         int err;
1299         do {
1300                 err = nfs4_handle_exception(server,
1301                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1302                                 &exception);
1303         } while (exception.retry);
1304         return err;
1305 }
1306
1307 struct nfs4_closedata {
1308         struct path path;
1309         struct inode *inode;
1310         struct nfs4_state *state;
1311         struct nfs_closeargs arg;
1312         struct nfs_closeres res;
1313         struct nfs_fattr fattr;
1314         unsigned long timestamp;
1315 };
1316
1317 static void nfs4_free_closedata(void *data)
1318 {
1319         struct nfs4_closedata *calldata = data;
1320         struct nfs4_state_owner *sp = calldata->state->owner;
1321
1322         nfs4_put_open_state(calldata->state);
1323         nfs_free_seqid(calldata->arg.seqid);
1324         nfs4_put_state_owner(sp);
1325         path_put(&calldata->path);
1326         kfree(calldata);
1327 }
1328
1329 static void nfs4_close_done(struct rpc_task *task, void *data)
1330 {
1331         struct nfs4_closedata *calldata = data;
1332         struct nfs4_state *state = calldata->state;
1333         struct nfs_server *server = NFS_SERVER(calldata->inode);
1334
1335         if (RPC_ASSASSINATED(task))
1336                 return;
1337         /* hmm. we are done with the inode, and in the process of freeing
1338          * the state_owner. we keep this around to process errors
1339          */
1340         switch (task->tk_status) {
1341                 case 0:
1342                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1343                         renew_lease(server, calldata->timestamp);
1344                         break;
1345                 case -NFS4ERR_STALE_STATEID:
1346                 case -NFS4ERR_OLD_STATEID:
1347                 case -NFS4ERR_BAD_STATEID:
1348                 case -NFS4ERR_EXPIRED:
1349                         if (calldata->arg.fmode == 0)
1350                                 break;
1351                 default:
1352                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1353                                 rpc_restart_call(task);
1354                                 return;
1355                         }
1356         }
1357         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1358 }
1359
1360 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1361 {
1362         struct nfs4_closedata *calldata = data;
1363         struct nfs4_state *state = calldata->state;
1364         int clear_rd, clear_wr, clear_rdwr;
1365
1366         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1367                 return;
1368
1369         clear_rd = clear_wr = clear_rdwr = 0;
1370         spin_lock(&state->owner->so_lock);
1371         /* Calculate the change in open mode */
1372         if (state->n_rdwr == 0) {
1373                 if (state->n_rdonly == 0) {
1374                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1375                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1376                 }
1377                 if (state->n_wronly == 0) {
1378                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1379                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1380                 }
1381         }
1382         spin_unlock(&state->owner->so_lock);
1383         if (!clear_rd && !clear_wr && !clear_rdwr) {
1384                 /* Note: exit _without_ calling nfs4_close_done */
1385                 task->tk_action = NULL;
1386                 return;
1387         }
1388         nfs_fattr_init(calldata->res.fattr);
1389         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1390                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1391                 calldata->arg.fmode = FMODE_READ;
1392         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1393                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1394                 calldata->arg.fmode = FMODE_WRITE;
1395         }
1396         calldata->timestamp = jiffies;
1397         rpc_call_start(task);
1398 }
1399
1400 static const struct rpc_call_ops nfs4_close_ops = {
1401         .rpc_call_prepare = nfs4_close_prepare,
1402         .rpc_call_done = nfs4_close_done,
1403         .rpc_release = nfs4_free_closedata,
1404 };
1405
1406 /*
1407  * It is possible for data to be read/written from a mem-mapped file
1408  * after the sys_close call (which hits the vfs layer as a flush).
1409  * This means that we can't safely call nfsv4 close on a file until
1410  * the inode is cleared. This in turn means that we are not good
1411  * NFSv4 citizens - we do not indicate to the server to update the file's
1412  * share state even when we are done with one of the three share
1413  * stateid's in the inode.
1414  *
1415  * NOTE: Caller must be holding the sp->so_owner semaphore!
1416  */
1417 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1418 {
1419         struct nfs_server *server = NFS_SERVER(state->inode);
1420         struct nfs4_closedata *calldata;
1421         struct nfs4_state_owner *sp = state->owner;
1422         struct rpc_task *task;
1423         struct rpc_message msg = {
1424                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1425                 .rpc_cred = state->owner->so_cred,
1426         };
1427         struct rpc_task_setup task_setup_data = {
1428                 .rpc_client = server->client,
1429                 .rpc_message = &msg,
1430                 .callback_ops = &nfs4_close_ops,
1431                 .workqueue = nfsiod_workqueue,
1432                 .flags = RPC_TASK_ASYNC,
1433         };
1434         int status = -ENOMEM;
1435
1436         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1437         if (calldata == NULL)
1438                 goto out;
1439         calldata->inode = state->inode;
1440         calldata->state = state;
1441         calldata->arg.fh = NFS_FH(state->inode);
1442         calldata->arg.stateid = &state->open_stateid;
1443         /* Serialization for the sequence id */
1444         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1445         if (calldata->arg.seqid == NULL)
1446                 goto out_free_calldata;
1447         calldata->arg.fmode = 0;
1448         calldata->arg.bitmask = server->cache_consistency_bitmask;
1449         calldata->res.fattr = &calldata->fattr;
1450         calldata->res.seqid = calldata->arg.seqid;
1451         calldata->res.server = server;
1452         calldata->path.mnt = mntget(path->mnt);
1453         calldata->path.dentry = dget(path->dentry);
1454
1455         msg.rpc_argp = &calldata->arg,
1456         msg.rpc_resp = &calldata->res,
1457         task_setup_data.callback_data = calldata;
1458         task = rpc_run_task(&task_setup_data);
1459         if (IS_ERR(task))
1460                 return PTR_ERR(task);
1461         status = 0;
1462         if (wait)
1463                 status = rpc_wait_for_completion_task(task);
1464         rpc_put_task(task);
1465         return status;
1466 out_free_calldata:
1467         kfree(calldata);
1468 out:
1469         nfs4_put_open_state(state);
1470         nfs4_put_state_owner(sp);
1471         return status;
1472 }
1473
1474 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1475 {
1476         struct file *filp;
1477         int ret;
1478
1479         /* If the open_intent is for execute, we have an extra check to make */
1480         if (fmode & FMODE_EXEC) {
1481                 ret = nfs_may_open(state->inode,
1482                                 state->owner->so_cred,
1483                                 nd->intent.open.flags);
1484                 if (ret < 0)
1485                         goto out_close;
1486         }
1487         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1488         if (!IS_ERR(filp)) {
1489                 struct nfs_open_context *ctx;
1490                 ctx = nfs_file_open_context(filp);
1491                 ctx->state = state;
1492                 return 0;
1493         }
1494         ret = PTR_ERR(filp);
1495 out_close:
1496         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1497         return ret;
1498 }
1499
1500 struct dentry *
1501 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1502 {
1503         struct path path = {
1504                 .mnt = nd->path.mnt,
1505                 .dentry = dentry,
1506         };
1507         struct dentry *parent;
1508         struct iattr attr;
1509         struct rpc_cred *cred;
1510         struct nfs4_state *state;
1511         struct dentry *res;
1512         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1513
1514         if (nd->flags & LOOKUP_CREATE) {
1515                 attr.ia_mode = nd->intent.open.create_mode;
1516                 attr.ia_valid = ATTR_MODE;
1517                 if (!IS_POSIXACL(dir))
1518                         attr.ia_mode &= ~current_umask();
1519         } else {
1520                 attr.ia_valid = 0;
1521                 BUG_ON(nd->intent.open.flags & O_CREAT);
1522         }
1523
1524         cred = rpc_lookup_cred();
1525         if (IS_ERR(cred))
1526                 return (struct dentry *)cred;
1527         parent = dentry->d_parent;
1528         /* Protect against concurrent sillydeletes */
1529         nfs_block_sillyrename(parent);
1530         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1531         put_rpccred(cred);
1532         if (IS_ERR(state)) {
1533                 if (PTR_ERR(state) == -ENOENT) {
1534                         d_add(dentry, NULL);
1535                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1536                 }
1537                 nfs_unblock_sillyrename(parent);
1538                 return (struct dentry *)state;
1539         }
1540         res = d_add_unique(dentry, igrab(state->inode));
1541         if (res != NULL)
1542                 path.dentry = res;
1543         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1544         nfs_unblock_sillyrename(parent);
1545         nfs4_intent_set_file(nd, &path, state, fmode);
1546         return res;
1547 }
1548
1549 int
1550 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1551 {
1552         struct path path = {
1553                 .mnt = nd->path.mnt,
1554                 .dentry = dentry,
1555         };
1556         struct rpc_cred *cred;
1557         struct nfs4_state *state;
1558         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1559
1560         cred = rpc_lookup_cred();
1561         if (IS_ERR(cred))
1562                 return PTR_ERR(cred);
1563         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1564         put_rpccred(cred);
1565         if (IS_ERR(state)) {
1566                 switch (PTR_ERR(state)) {
1567                         case -EPERM:
1568                         case -EACCES:
1569                         case -EDQUOT:
1570                         case -ENOSPC:
1571                         case -EROFS:
1572                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1573                                 return 1;
1574                         default:
1575                                 goto out_drop;
1576                 }
1577         }
1578         if (state->inode == dentry->d_inode) {
1579                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1580                 nfs4_intent_set_file(nd, &path, state, fmode);
1581                 return 1;
1582         }
1583         nfs4_close_sync(&path, state, fmode);
1584 out_drop:
1585         d_drop(dentry);
1586         return 0;
1587 }
1588
1589 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1590 {
1591         if (ctx->state == NULL)
1592                 return;
1593         if (is_sync)
1594                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1595         else
1596                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1597 }
1598
1599 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1600 {
1601         struct nfs4_server_caps_res res = {};
1602         struct rpc_message msg = {
1603                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1604                 .rpc_argp = fhandle,
1605                 .rpc_resp = &res,
1606         };
1607         int status;
1608
1609         status = rpc_call_sync(server->client, &msg, 0);
1610         if (status == 0) {
1611                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1612                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1613                         server->caps |= NFS_CAP_ACLS;
1614                 if (res.has_links != 0)
1615                         server->caps |= NFS_CAP_HARDLINKS;
1616                 if (res.has_symlinks != 0)
1617                         server->caps |= NFS_CAP_SYMLINKS;
1618                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
1619                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
1620                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1621                 server->acl_bitmask = res.acl_bitmask;
1622         }
1623         return status;
1624 }
1625
1626 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1627 {
1628         struct nfs4_exception exception = { };
1629         int err;
1630         do {
1631                 err = nfs4_handle_exception(server,
1632                                 _nfs4_server_capabilities(server, fhandle),
1633                                 &exception);
1634         } while (exception.retry);
1635         return err;
1636 }
1637
1638 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1639                 struct nfs_fsinfo *info)
1640 {
1641         struct nfs4_lookup_root_arg args = {
1642                 .bitmask = nfs4_fattr_bitmap,
1643         };
1644         struct nfs4_lookup_res res = {
1645                 .server = server,
1646                 .fattr = info->fattr,
1647                 .fh = fhandle,
1648         };
1649         struct rpc_message msg = {
1650                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1651                 .rpc_argp = &args,
1652                 .rpc_resp = &res,
1653         };
1654         nfs_fattr_init(info->fattr);
1655         return rpc_call_sync(server->client, &msg, 0);
1656 }
1657
1658 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1659                 struct nfs_fsinfo *info)
1660 {
1661         struct nfs4_exception exception = { };
1662         int err;
1663         do {
1664                 err = nfs4_handle_exception(server,
1665                                 _nfs4_lookup_root(server, fhandle, info),
1666                                 &exception);
1667         } while (exception.retry);
1668         return err;
1669 }
1670
1671 /*
1672  * get the file handle for the "/" directory on the server
1673  */
1674 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1675                               struct nfs_fsinfo *info)
1676 {
1677         int status;
1678
1679         status = nfs4_lookup_root(server, fhandle, info);
1680         if (status == 0)
1681                 status = nfs4_server_capabilities(server, fhandle);
1682         if (status == 0)
1683                 status = nfs4_do_fsinfo(server, fhandle, info);
1684         return nfs4_map_errors(status);
1685 }
1686
1687 /*
1688  * Get locations and (maybe) other attributes of a referral.
1689  * Note that we'll actually follow the referral later when
1690  * we detect fsid mismatch in inode revalidation
1691  */
1692 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1693 {
1694         int status = -ENOMEM;
1695         struct page *page = NULL;
1696         struct nfs4_fs_locations *locations = NULL;
1697
1698         page = alloc_page(GFP_KERNEL);
1699         if (page == NULL)
1700                 goto out;
1701         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1702         if (locations == NULL)
1703                 goto out;
1704
1705         status = nfs4_proc_fs_locations(dir, name, locations, page);
1706         if (status != 0)
1707                 goto out;
1708         /* Make sure server returned a different fsid for the referral */
1709         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1710                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1711                 status = -EIO;
1712                 goto out;
1713         }
1714
1715         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1716         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1717         if (!fattr->mode)
1718                 fattr->mode = S_IFDIR;
1719         memset(fhandle, 0, sizeof(struct nfs_fh));
1720 out:
1721         if (page)
1722                 __free_page(page);
1723         if (locations)
1724                 kfree(locations);
1725         return status;
1726 }
1727
1728 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1729 {
1730         struct nfs4_getattr_arg args = {
1731                 .fh = fhandle,
1732                 .bitmask = server->attr_bitmask,
1733         };
1734         struct nfs4_getattr_res res = {
1735                 .fattr = fattr,
1736                 .server = server,
1737         };
1738         struct rpc_message msg = {
1739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1740                 .rpc_argp = &args,
1741                 .rpc_resp = &res,
1742         };
1743
1744         nfs_fattr_init(fattr);
1745         return rpc_call_sync(server->client, &msg, 0);
1746 }
1747
1748 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1749 {
1750         struct nfs4_exception exception = { };
1751         int err;
1752         do {
1753                 err = nfs4_handle_exception(server,
1754                                 _nfs4_proc_getattr(server, fhandle, fattr),
1755                                 &exception);
1756         } while (exception.retry);
1757         return err;
1758 }
1759
1760 /*
1761  * The file is not closed if it is opened due to the a request to change
1762  * the size of the file. The open call will not be needed once the
1763  * VFS layer lookup-intents are implemented.
1764  *
1765  * Close is called when the inode is destroyed.
1766  * If we haven't opened the file for O_WRONLY, we
1767  * need to in the size_change case to obtain a stateid.
1768  *
1769  * Got race?
1770  * Because OPEN is always done by name in nfsv4, it is
1771  * possible that we opened a different file by the same
1772  * name.  We can recognize this race condition, but we
1773  * can't do anything about it besides returning an error.
1774  *
1775  * This will be fixed with VFS changes (lookup-intent).
1776  */
1777 static int
1778 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1779                   struct iattr *sattr)
1780 {
1781         struct inode *inode = dentry->d_inode;
1782         struct rpc_cred *cred = NULL;
1783         struct nfs4_state *state = NULL;
1784         int status;
1785
1786         nfs_fattr_init(fattr);
1787
1788         /* Search for an existing open(O_WRITE) file */
1789         if (sattr->ia_valid & ATTR_FILE) {
1790                 struct nfs_open_context *ctx;
1791
1792                 ctx = nfs_file_open_context(sattr->ia_file);
1793                 if (ctx) {
1794                         cred = ctx->cred;
1795                         state = ctx->state;
1796                 }
1797         }
1798
1799         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1800         if (status == 0)
1801                 nfs_setattr_update_inode(inode, sattr);
1802         return status;
1803 }
1804
1805 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1806                 const struct qstr *name, struct nfs_fh *fhandle,
1807                 struct nfs_fattr *fattr)
1808 {
1809         int                    status;
1810         struct nfs4_lookup_arg args = {
1811                 .bitmask = server->attr_bitmask,
1812                 .dir_fh = dirfh,
1813                 .name = name,
1814         };
1815         struct nfs4_lookup_res res = {
1816                 .server = server,
1817                 .fattr = fattr,
1818                 .fh = fhandle,
1819         };
1820         struct rpc_message msg = {
1821                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1822                 .rpc_argp = &args,
1823                 .rpc_resp = &res,
1824         };
1825
1826         nfs_fattr_init(fattr);
1827
1828         dprintk("NFS call  lookupfh %s\n", name->name);
1829         status = rpc_call_sync(server->client, &msg, 0);
1830         dprintk("NFS reply lookupfh: %d\n", status);
1831         return status;
1832 }
1833
1834 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1835                               struct qstr *name, struct nfs_fh *fhandle,
1836                               struct nfs_fattr *fattr)
1837 {
1838         struct nfs4_exception exception = { };
1839         int err;
1840         do {
1841                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1842                 /* FIXME: !!!! */
1843                 if (err == -NFS4ERR_MOVED) {
1844                         err = -EREMOTE;
1845                         break;
1846                 }
1847                 err = nfs4_handle_exception(server, err, &exception);
1848         } while (exception.retry);
1849         return err;
1850 }
1851
1852 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1853                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1854 {
1855         int status;
1856
1857         dprintk("NFS call  lookup %s\n", name->name);
1858         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1859         if (status == -NFS4ERR_MOVED)
1860                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1861         dprintk("NFS reply lookup: %d\n", status);
1862         return status;
1863 }
1864
1865 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1866 {
1867         struct nfs4_exception exception = { };
1868         int err;
1869         do {
1870                 err = nfs4_handle_exception(NFS_SERVER(dir),
1871                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1872                                 &exception);
1873         } while (exception.retry);
1874         return err;
1875 }
1876
1877 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1878 {
1879         struct nfs_server *server = NFS_SERVER(inode);
1880         struct nfs_fattr fattr;
1881         struct nfs4_accessargs args = {
1882                 .fh = NFS_FH(inode),
1883                 .bitmask = server->attr_bitmask,
1884         };
1885         struct nfs4_accessres res = {
1886                 .server = server,
1887                 .fattr = &fattr,
1888         };
1889         struct rpc_message msg = {
1890                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1891                 .rpc_argp = &args,
1892                 .rpc_resp = &res,
1893                 .rpc_cred = entry->cred,
1894         };
1895         int mode = entry->mask;
1896         int status;
1897
1898         /*
1899          * Determine which access bits we want to ask for...
1900          */
1901         if (mode & MAY_READ)
1902                 args.access |= NFS4_ACCESS_READ;
1903         if (S_ISDIR(inode->i_mode)) {
1904                 if (mode & MAY_WRITE)
1905                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1906                 if (mode & MAY_EXEC)
1907                         args.access |= NFS4_ACCESS_LOOKUP;
1908         } else {
1909                 if (mode & MAY_WRITE)
1910                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1911                 if (mode & MAY_EXEC)
1912                         args.access |= NFS4_ACCESS_EXECUTE;
1913         }
1914         nfs_fattr_init(&fattr);
1915         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1916         if (!status) {
1917                 entry->mask = 0;
1918                 if (res.access & NFS4_ACCESS_READ)
1919                         entry->mask |= MAY_READ;
1920                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1921                         entry->mask |= MAY_WRITE;
1922                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1923                         entry->mask |= MAY_EXEC;
1924                 nfs_refresh_inode(inode, &fattr);
1925         }
1926         return status;
1927 }
1928
1929 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1930 {
1931         struct nfs4_exception exception = { };
1932         int err;
1933         do {
1934                 err = nfs4_handle_exception(NFS_SERVER(inode),
1935                                 _nfs4_proc_access(inode, entry),
1936                                 &exception);
1937         } while (exception.retry);
1938         return err;
1939 }
1940
1941 /*
1942  * TODO: For the time being, we don't try to get any attributes
1943  * along with any of the zero-copy operations READ, READDIR,
1944  * READLINK, WRITE.
1945  *
1946  * In the case of the first three, we want to put the GETATTR
1947  * after the read-type operation -- this is because it is hard
1948  * to predict the length of a GETATTR response in v4, and thus
1949  * align the READ data correctly.  This means that the GETATTR
1950  * may end up partially falling into the page cache, and we should
1951  * shift it into the 'tail' of the xdr_buf before processing.
1952  * To do this efficiently, we need to know the total length
1953  * of data received, which doesn't seem to be available outside
1954  * of the RPC layer.
1955  *
1956  * In the case of WRITE, we also want to put the GETATTR after
1957  * the operation -- in this case because we want to make sure
1958  * we get the post-operation mtime and size.  This means that
1959  * we can't use xdr_encode_pages() as written: we need a variant
1960  * of it which would leave room in the 'tail' iovec.
1961  *
1962  * Both of these changes to the XDR layer would in fact be quite
1963  * minor, but I decided to leave them for a subsequent patch.
1964  */
1965 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1966                 unsigned int pgbase, unsigned int pglen)
1967 {
1968         struct nfs4_readlink args = {
1969                 .fh       = NFS_FH(inode),
1970                 .pgbase   = pgbase,
1971                 .pglen    = pglen,
1972                 .pages    = &page,
1973         };
1974         struct rpc_message msg = {
1975                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1976                 .rpc_argp = &args,
1977                 .rpc_resp = NULL,
1978         };
1979
1980         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1981 }
1982
1983 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1984                 unsigned int pgbase, unsigned int pglen)
1985 {
1986         struct nfs4_exception exception = { };
1987         int err;
1988         do {
1989                 err = nfs4_handle_exception(NFS_SERVER(inode),
1990                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1991                                 &exception);
1992         } while (exception.retry);
1993         return err;
1994 }
1995
1996 /*
1997  * Got race?
1998  * We will need to arrange for the VFS layer to provide an atomic open.
1999  * Until then, this create/open method is prone to inefficiency and race
2000  * conditions due to the lookup, create, and open VFS calls from sys_open()
2001  * placed on the wire.
2002  *
2003  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2004  * The file will be opened again in the subsequent VFS open call
2005  * (nfs4_proc_file_open).
2006  *
2007  * The open for read will just hang around to be used by any process that
2008  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2009  */
2010
2011 static int
2012 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2013                  int flags, struct nameidata *nd)
2014 {
2015         struct path path = {
2016                 .mnt = nd->path.mnt,
2017                 .dentry = dentry,
2018         };
2019         struct nfs4_state *state;
2020         struct rpc_cred *cred;
2021         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2022         int status = 0;
2023
2024         cred = rpc_lookup_cred();
2025         if (IS_ERR(cred)) {
2026                 status = PTR_ERR(cred);
2027                 goto out;
2028         }
2029         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2030         d_drop(dentry);
2031         if (IS_ERR(state)) {
2032                 status = PTR_ERR(state);
2033                 goto out_putcred;
2034         }
2035         d_add(dentry, igrab(state->inode));
2036         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2037         if (flags & O_EXCL) {
2038                 struct nfs_fattr fattr;
2039                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2040                 if (status == 0)
2041                         nfs_setattr_update_inode(state->inode, sattr);
2042                 nfs_post_op_update_inode(state->inode, &fattr);
2043         }
2044         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2045                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2046         else
2047                 nfs4_close_sync(&path, state, fmode);
2048 out_putcred:
2049         put_rpccred(cred);
2050 out:
2051         return status;
2052 }
2053
2054 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2055 {
2056         struct nfs_server *server = NFS_SERVER(dir);
2057         struct nfs_removeargs args = {
2058                 .fh = NFS_FH(dir),
2059                 .name.len = name->len,
2060                 .name.name = name->name,
2061                 .bitmask = server->attr_bitmask,
2062         };
2063         struct nfs_removeres res = {
2064                 .server = server,
2065         };
2066         struct rpc_message msg = {
2067                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2068                 .rpc_argp = &args,
2069                 .rpc_resp = &res,
2070         };
2071         int                     status;
2072
2073         nfs_fattr_init(&res.dir_attr);
2074         status = rpc_call_sync(server->client, &msg, 0);
2075         if (status == 0) {
2076                 update_changeattr(dir, &res.cinfo);
2077                 nfs_post_op_update_inode(dir, &res.dir_attr);
2078         }
2079         return status;
2080 }
2081
2082 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2083 {
2084         struct nfs4_exception exception = { };
2085         int err;
2086         do {
2087                 err = nfs4_handle_exception(NFS_SERVER(dir),
2088                                 _nfs4_proc_remove(dir, name),
2089                                 &exception);
2090         } while (exception.retry);
2091         return err;
2092 }
2093
2094 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2095 {
2096         struct nfs_server *server = NFS_SERVER(dir);
2097         struct nfs_removeargs *args = msg->rpc_argp;
2098         struct nfs_removeres *res = msg->rpc_resp;
2099
2100         args->bitmask = server->cache_consistency_bitmask;
2101         res->server = server;
2102         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2103 }
2104
2105 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2106 {
2107         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2108
2109         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2110                 return 0;
2111         update_changeattr(dir, &res->cinfo);
2112         nfs_post_op_update_inode(dir, &res->dir_attr);
2113         return 1;
2114 }
2115
2116 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2117                 struct inode *new_dir, struct qstr *new_name)
2118 {
2119         struct nfs_server *server = NFS_SERVER(old_dir);
2120         struct nfs4_rename_arg arg = {
2121                 .old_dir = NFS_FH(old_dir),
2122                 .new_dir = NFS_FH(new_dir),
2123                 .old_name = old_name,
2124                 .new_name = new_name,
2125                 .bitmask = server->attr_bitmask,
2126         };
2127         struct nfs_fattr old_fattr, new_fattr;
2128         struct nfs4_rename_res res = {
2129                 .server = server,
2130                 .old_fattr = &old_fattr,
2131                 .new_fattr = &new_fattr,
2132         };
2133         struct rpc_message msg = {
2134                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2135                 .rpc_argp = &arg,
2136                 .rpc_resp = &res,
2137         };
2138         int                     status;
2139
2140         nfs_fattr_init(res.old_fattr);
2141         nfs_fattr_init(res.new_fattr);
2142         status = rpc_call_sync(server->client, &msg, 0);
2143
2144         if (!status) {
2145                 update_changeattr(old_dir, &res.old_cinfo);
2146                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2147                 update_changeattr(new_dir, &res.new_cinfo);
2148                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2149         }
2150         return status;
2151 }
2152
2153 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2154                 struct inode *new_dir, struct qstr *new_name)
2155 {
2156         struct nfs4_exception exception = { };
2157         int err;
2158         do {
2159                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2160                                 _nfs4_proc_rename(old_dir, old_name,
2161                                         new_dir, new_name),
2162                                 &exception);
2163         } while (exception.retry);
2164         return err;
2165 }
2166
2167 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2168 {
2169         struct nfs_server *server = NFS_SERVER(inode);
2170         struct nfs4_link_arg arg = {
2171                 .fh     = NFS_FH(inode),
2172                 .dir_fh = NFS_FH(dir),
2173                 .name   = name,
2174                 .bitmask = server->attr_bitmask,
2175         };
2176         struct nfs_fattr fattr, dir_attr;
2177         struct nfs4_link_res res = {
2178                 .server = server,
2179                 .fattr = &fattr,
2180                 .dir_attr = &dir_attr,
2181         };
2182         struct rpc_message msg = {
2183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2184                 .rpc_argp = &arg,
2185                 .rpc_resp = &res,
2186         };
2187         int                     status;
2188
2189         nfs_fattr_init(res.fattr);
2190         nfs_fattr_init(res.dir_attr);
2191         status = rpc_call_sync(server->client, &msg, 0);
2192         if (!status) {
2193                 update_changeattr(dir, &res.cinfo);
2194                 nfs_post_op_update_inode(dir, res.dir_attr);
2195                 nfs_post_op_update_inode(inode, res.fattr);
2196         }
2197
2198         return status;
2199 }
2200
2201 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2202 {
2203         struct nfs4_exception exception = { };
2204         int err;
2205         do {
2206                 err = nfs4_handle_exception(NFS_SERVER(inode),
2207                                 _nfs4_proc_link(inode, dir, name),
2208                                 &exception);
2209         } while (exception.retry);
2210         return err;
2211 }
2212
2213 struct nfs4_createdata {
2214         struct rpc_message msg;
2215         struct nfs4_create_arg arg;
2216         struct nfs4_create_res res;
2217         struct nfs_fh fh;
2218         struct nfs_fattr fattr;
2219         struct nfs_fattr dir_fattr;
2220 };
2221
2222 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2223                 struct qstr *name, struct iattr *sattr, u32 ftype)
2224 {
2225         struct nfs4_createdata *data;
2226
2227         data = kzalloc(sizeof(*data), GFP_KERNEL);
2228         if (data != NULL) {
2229                 struct nfs_server *server = NFS_SERVER(dir);
2230
2231                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2232                 data->msg.rpc_argp = &data->arg;
2233                 data->msg.rpc_resp = &data->res;
2234                 data->arg.dir_fh = NFS_FH(dir);
2235                 data->arg.server = server;
2236                 data->arg.name = name;
2237                 data->arg.attrs = sattr;
2238                 data->arg.ftype = ftype;
2239                 data->arg.bitmask = server->attr_bitmask;
2240                 data->res.server = server;
2241                 data->res.fh = &data->fh;
2242                 data->res.fattr = &data->fattr;
2243                 data->res.dir_fattr = &data->dir_fattr;
2244                 nfs_fattr_init(data->res.fattr);
2245                 nfs_fattr_init(data->res.dir_fattr);
2246         }
2247         return data;
2248 }
2249
2250 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2251 {
2252         int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2253         if (status == 0) {
2254                 update_changeattr(dir, &data->res.dir_cinfo);
2255                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2256                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2257         }
2258         return status;
2259 }
2260
2261 static void nfs4_free_createdata(struct nfs4_createdata *data)
2262 {
2263         kfree(data);
2264 }
2265
2266 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2267                 struct page *page, unsigned int len, struct iattr *sattr)
2268 {
2269         struct nfs4_createdata *data;
2270         int status = -ENAMETOOLONG;
2271
2272         if (len > NFS4_MAXPATHLEN)
2273                 goto out;
2274
2275         status = -ENOMEM;
2276         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2277         if (data == NULL)
2278                 goto out;
2279
2280         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2281         data->arg.u.symlink.pages = &page;
2282         data->arg.u.symlink.len = len;
2283
2284         status = nfs4_do_create(dir, dentry, data);
2285
2286         nfs4_free_createdata(data);
2287 out:
2288         return status;
2289 }
2290
2291 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2292                 struct page *page, unsigned int len, struct iattr *sattr)
2293 {
2294         struct nfs4_exception exception = { };
2295         int err;
2296         do {
2297                 err = nfs4_handle_exception(NFS_SERVER(dir),
2298                                 _nfs4_proc_symlink(dir, dentry, page,
2299                                                         len, sattr),
2300                                 &exception);
2301         } while (exception.retry);
2302         return err;
2303 }
2304
2305 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2306                 struct iattr *sattr)
2307 {
2308         struct nfs4_createdata *data;
2309         int status = -ENOMEM;
2310
2311         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2312         if (data == NULL)
2313                 goto out;
2314
2315         status = nfs4_do_create(dir, dentry, data);
2316
2317         nfs4_free_createdata(data);
2318 out:
2319         return status;
2320 }
2321
2322 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2323                 struct iattr *sattr)
2324 {
2325         struct nfs4_exception exception = { };
2326         int err;
2327         do {
2328                 err = nfs4_handle_exception(NFS_SERVER(dir),
2329                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2330                                 &exception);
2331         } while (exception.retry);
2332         return err;
2333 }
2334
2335 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2336                   u64 cookie, struct page *page, unsigned int count, int plus)
2337 {
2338         struct inode            *dir = dentry->d_inode;
2339         struct nfs4_readdir_arg args = {
2340                 .fh = NFS_FH(dir),
2341                 .pages = &page,
2342                 .pgbase = 0,
2343                 .count = count,
2344                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2345         };
2346         struct nfs4_readdir_res res;
2347         struct rpc_message msg = {
2348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2349                 .rpc_argp = &args,
2350                 .rpc_resp = &res,
2351                 .rpc_cred = cred,
2352         };
2353         int                     status;
2354
2355         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2356                         dentry->d_parent->d_name.name,
2357                         dentry->d_name.name,
2358                         (unsigned long long)cookie);
2359         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2360         res.pgbase = args.pgbase;
2361         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2362         if (status == 0)
2363                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2364
2365         nfs_invalidate_atime(dir);
2366
2367         dprintk("%s: returns %d\n", __func__, status);
2368         return status;
2369 }
2370
2371 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2372                   u64 cookie, struct page *page, unsigned int count, int plus)
2373 {
2374         struct nfs4_exception exception = { };
2375         int err;
2376         do {
2377                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2378                                 _nfs4_proc_readdir(dentry, cred, cookie,
2379                                         page, count, plus),
2380                                 &exception);
2381         } while (exception.retry);
2382         return err;
2383 }
2384
2385 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2386                 struct iattr *sattr, dev_t rdev)
2387 {
2388         struct nfs4_createdata *data;
2389         int mode = sattr->ia_mode;
2390         int status = -ENOMEM;
2391
2392         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2393         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2394
2395         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2396         if (data == NULL)
2397                 goto out;
2398
2399         if (S_ISFIFO(mode))
2400                 data->arg.ftype = NF4FIFO;
2401         else if (S_ISBLK(mode)) {
2402                 data->arg.ftype = NF4BLK;
2403                 data->arg.u.device.specdata1 = MAJOR(rdev);
2404                 data->arg.u.device.specdata2 = MINOR(rdev);
2405         }
2406         else if (S_ISCHR(mode)) {
2407                 data->arg.ftype = NF4CHR;
2408                 data->arg.u.device.specdata1 = MAJOR(rdev);
2409                 data->arg.u.device.specdata2 = MINOR(rdev);
2410         }
2411
2412         status = nfs4_do_create(dir, dentry, data);
2413
2414         nfs4_free_createdata(data);
2415 out:
2416         return status;
2417 }
2418
2419 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2420                 struct iattr *sattr, dev_t rdev)
2421 {
2422         struct nfs4_exception exception = { };
2423         int err;
2424         do {
2425                 err = nfs4_handle_exception(NFS_SERVER(dir),
2426                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2427                                 &exception);
2428         } while (exception.retry);
2429         return err;
2430 }
2431
2432 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2433                  struct nfs_fsstat *fsstat)
2434 {
2435         struct nfs4_statfs_arg args = {
2436                 .fh = fhandle,
2437                 .bitmask = server->attr_bitmask,
2438         };
2439         struct rpc_message msg = {
2440                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2441                 .rpc_argp = &args,
2442                 .rpc_resp = fsstat,
2443         };
2444
2445         nfs_fattr_init(fsstat->fattr);
2446         return rpc_call_sync(server->client, &msg, 0);
2447 }
2448
2449 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2450 {
2451         struct nfs4_exception exception = { };
2452         int err;
2453         do {
2454                 err = nfs4_handle_exception(server,
2455                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2456                                 &exception);
2457         } while (exception.retry);
2458         return err;
2459 }
2460
2461 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2462                 struct nfs_fsinfo *fsinfo)
2463 {
2464         struct nfs4_fsinfo_arg args = {
2465                 .fh = fhandle,
2466                 .bitmask = server->attr_bitmask,
2467         };
2468         struct rpc_message msg = {
2469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2470                 .rpc_argp = &args,
2471                 .rpc_resp = fsinfo,
2472         };
2473
2474         return rpc_call_sync(server->client, &msg, 0);
2475 }
2476
2477 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2478 {
2479         struct nfs4_exception exception = { };
2480         int err;
2481
2482         do {
2483                 err = nfs4_handle_exception(server,
2484                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2485                                 &exception);
2486         } while (exception.retry);
2487         return err;
2488 }
2489
2490 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2491 {
2492         nfs_fattr_init(fsinfo->fattr);
2493         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2494 }
2495
2496 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2497                 struct nfs_pathconf *pathconf)
2498 {
2499         struct nfs4_pathconf_arg args = {
2500                 .fh = fhandle,
2501                 .bitmask = server->attr_bitmask,
2502         };
2503         struct rpc_message msg = {
2504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2505                 .rpc_argp = &args,
2506                 .rpc_resp = pathconf,
2507         };
2508
2509         /* None of the pathconf attributes are mandatory to implement */
2510         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2511                 memset(pathconf, 0, sizeof(*pathconf));
2512                 return 0;
2513         }
2514
2515         nfs_fattr_init(pathconf->fattr);
2516         return rpc_call_sync(server->client, &msg, 0);
2517 }
2518
2519 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2520                 struct nfs_pathconf *pathconf)
2521 {
2522         struct nfs4_exception exception = { };
2523         int err;
2524
2525         do {
2526                 err = nfs4_handle_exception(server,
2527                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2528                                 &exception);
2529         } while (exception.retry);
2530         return err;
2531 }
2532
2533 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2534 {
2535         struct nfs_server *server = NFS_SERVER(data->inode);
2536
2537         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2538                 rpc_restart_call(task);
2539                 return -EAGAIN;
2540         }
2541
2542         nfs_invalidate_atime(data->inode);
2543         if (task->tk_status > 0)
2544                 renew_lease(server, data->timestamp);
2545         return 0;
2546 }
2547
2548 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2549 {
2550         data->timestamp   = jiffies;
2551         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2552 }
2553
2554 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2555 {
2556         struct inode *inode = data->inode;
2557
2558         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2559                 rpc_restart_call(task);
2560                 return -EAGAIN;
2561         }
2562         if (task->tk_status >= 0) {
2563                 renew_lease(NFS_SERVER(inode), data->timestamp);
2564                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2565         }
2566         return 0;
2567 }
2568
2569 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2570 {
2571         struct nfs_server *server = NFS_SERVER(data->inode);
2572
2573         data->args.bitmask = server->cache_consistency_bitmask;
2574         data->res.server = server;
2575         data->timestamp   = jiffies;
2576
2577         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2578 }
2579
2580 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2581 {
2582         struct inode *inode = data->inode;
2583
2584         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2585                 rpc_restart_call(task);
2586                 return -EAGAIN;
2587         }
2588         nfs_refresh_inode(inode, data->res.fattr);
2589         return 0;
2590 }
2591
2592 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2593 {
2594         struct nfs_server *server = NFS_SERVER(data->inode);
2595
2596         data->args.bitmask = server->cache_consistency_bitmask;
2597         data->res.server = server;
2598         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2599 }
2600
2601 /*
2602  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2603  * standalone procedure for queueing an asynchronous RENEW.
2604  */
2605 static void nfs4_renew_done(struct rpc_task *task, void *data)
2606 {
2607         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2608         unsigned long timestamp = (unsigned long)data;
2609
2610         if (task->tk_status < 0) {
2611                 /* Unless we're shutting down, schedule state recovery! */
2612                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
2613                         nfs4_schedule_state_recovery(clp);
2614                 return;
2615         }
2616         spin_lock(&clp->cl_lock);
2617         if (time_before(clp->cl_last_renewal,timestamp))
2618                 clp->cl_last_renewal = timestamp;
2619         spin_unlock(&clp->cl_lock);
2620 }
2621
2622 static const struct rpc_call_ops nfs4_renew_ops = {
2623         .rpc_call_done = nfs4_renew_done,
2624 };
2625
2626 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2627 {
2628         struct rpc_message msg = {
2629                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2630                 .rpc_argp       = clp,
2631                 .rpc_cred       = cred,
2632         };
2633
2634         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2635                         &nfs4_renew_ops, (void *)jiffies);
2636 }
2637
2638 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2639 {
2640         struct rpc_message msg = {
2641                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2642                 .rpc_argp       = clp,
2643                 .rpc_cred       = cred,
2644         };
2645         unsigned long now = jiffies;
2646         int status;
2647
2648         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2649         if (status < 0)
2650                 return status;
2651         spin_lock(&clp->cl_lock);
2652         if (time_before(clp->cl_last_renewal,now))
2653                 clp->cl_last_renewal = now;
2654         spin_unlock(&clp->cl_lock);
2655         return 0;
2656 }
2657
2658 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2659 {
2660         return (server->caps & NFS_CAP_ACLS)
2661                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2662                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2663 }
2664
2665 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2666  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2667  * the stack.
2668  */
2669 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2670
2671 static void buf_to_pages(const void *buf, size_t buflen,
2672                 struct page **pages, unsigned int *pgbase)
2673 {
2674         const void *p = buf;
2675
2676         *pgbase = offset_in_page(buf);
2677         p -= *pgbase;
2678         while (p < buf + buflen) {
2679                 *(pages++) = virt_to_page(p);
2680                 p += PAGE_CACHE_SIZE;
2681         }
2682 }
2683
2684 struct nfs4_cached_acl {
2685         int cached;
2686         size_t len;
2687         char data[0];
2688 };
2689
2690 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2691 {
2692         struct nfs_inode *nfsi = NFS_I(inode);
2693
2694         spin_lock(&inode->i_lock);
2695         kfree(nfsi->nfs4_acl);
2696         nfsi->nfs4_acl = acl;
2697         spin_unlock(&inode->i_lock);
2698 }
2699
2700 static void nfs4_zap_acl_attr(struct inode *inode)
2701 {
2702         nfs4_set_cached_acl(inode, NULL);
2703 }
2704
2705 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2706 {
2707         struct nfs_inode *nfsi = NFS_I(inode);
2708         struct nfs4_cached_acl *acl;
2709         int ret = -ENOENT;
2710
2711         spin_lock(&inode->i_lock);
2712         acl = nfsi->nfs4_acl;
2713         if (acl == NULL)
2714                 goto out;
2715         if (buf == NULL) /* user is just asking for length */
2716                 goto out_len;
2717         if (acl->cached == 0)
2718                 goto out;
2719         ret = -ERANGE; /* see getxattr(2) man page */
2720         if (acl->len > buflen)
2721                 goto out;
2722         memcpy(buf, acl->data, acl->len);
2723 out_len:
2724         ret = acl->len;
2725 out:
2726         spin_unlock(&inode->i_lock);
2727         return ret;
2728 }
2729
2730 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2731 {
2732         struct nfs4_cached_acl *acl;
2733
2734         if (buf && acl_len <= PAGE_SIZE) {
2735                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2736                 if (acl == NULL)
2737                         goto out;
2738                 acl->cached = 1;
2739                 memcpy(acl->data, buf, acl_len);
2740         } else {
2741                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2742                 if (acl == NULL)
2743                         goto out;
2744                 acl->cached = 0;
2745         }
2746         acl->len = acl_len;
2747 out:
2748         nfs4_set_cached_acl(inode, acl);
2749 }
2750
2751 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2752 {
2753         struct page *pages[NFS4ACL_MAXPAGES];
2754         struct nfs_getaclargs args = {
2755                 .fh = NFS_FH(inode),
2756                 .acl_pages = pages,
2757                 .acl_len = buflen,
2758         };
2759         size_t resp_len = buflen;
2760         void *resp_buf;
2761         struct rpc_message msg = {
2762                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2763                 .rpc_argp = &args,
2764                 .rpc_resp = &resp_len,
2765         };
2766         struct page *localpage = NULL;
2767         int ret;
2768
2769         if (buflen < PAGE_SIZE) {
2770                 /* As long as we're doing a round trip to the server anyway,
2771                  * let's be prepared for a page of acl data. */
2772                 localpage = alloc_page(GFP_KERNEL);
2773                 resp_buf = page_address(localpage);
2774                 if (localpage == NULL)
2775                         return -ENOMEM;
2776                 args.acl_pages[0] = localpage;
2777                 args.acl_pgbase = 0;
2778                 resp_len = args.acl_len = PAGE_SIZE;
2779         } else {
2780                 resp_buf = buf;
2781                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2782         }
2783         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2784         if (ret)
2785                 goto out_free;
2786         if (resp_len > args.acl_len)
2787                 nfs4_write_cached_acl(inode, NULL, resp_len);
2788         else
2789                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2790         if (buf) {
2791                 ret = -ERANGE;
2792                 if (resp_len > buflen)
2793                         goto out_free;
2794                 if (localpage)
2795                         memcpy(buf, resp_buf, resp_len);
2796         }
2797         ret = resp_len;
2798 out_free:
2799         if (localpage)
2800                 __free_page(localpage);
2801         return ret;
2802 }
2803
2804 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2805 {
2806         struct nfs4_exception exception = { };
2807         ssize_t ret;
2808         do {
2809                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2810                 if (ret >= 0)
2811                         break;
2812                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2813         } while (exception.retry);
2814         return ret;
2815 }
2816
2817 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2818 {
2819         struct nfs_server *server = NFS_SERVER(inode);
2820         int ret;
2821
2822         if (!nfs4_server_supports_acls(server))
2823                 return -EOPNOTSUPP;
2824         ret = nfs_revalidate_inode(server, inode);
2825         if (ret < 0)
2826                 return ret;
2827         ret = nfs4_read_cached_acl(inode, buf, buflen);
2828         if (ret != -ENOENT)
2829                 return ret;
2830         return nfs4_get_acl_uncached(inode, buf, buflen);
2831 }
2832
2833 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2834 {
2835         struct nfs_server *server = NFS_SERVER(inode);
2836         struct page *pages[NFS4ACL_MAXPAGES];
2837         struct nfs_setaclargs arg = {
2838                 .fh             = NFS_FH(inode),
2839                 .acl_pages      = pages,
2840                 .acl_len        = buflen,
2841         };
2842         struct rpc_message msg = {
2843                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2844                 .rpc_argp       = &arg,
2845                 .rpc_resp       = NULL,
2846         };
2847         int ret;
2848
2849         if (!nfs4_server_supports_acls(server))
2850                 return -EOPNOTSUPP;
2851         nfs_inode_return_delegation(inode);
2852         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2853         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2854         nfs_access_zap_cache(inode);
2855         nfs_zap_acl_cache(inode);
2856         return ret;
2857 }
2858
2859 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2860 {
2861         struct nfs4_exception exception = { };
2862         int err;
2863         do {
2864                 err = nfs4_handle_exception(NFS_SERVER(inode),
2865                                 __nfs4_proc_set_acl(inode, buf, buflen),
2866                                 &exception);
2867         } while (exception.retry);
2868         return err;
2869 }
2870
2871 static int
2872 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
2873 {
2874         struct nfs_client *clp = server->nfs_client;
2875
2876         if (!clp || task->tk_status >= 0)
2877                 return 0;
2878         switch(task->tk_status) {
2879                 case -NFS4ERR_ADMIN_REVOKED:
2880                 case -NFS4ERR_BAD_STATEID:
2881                 case -NFS4ERR_OPENMODE:
2882                         if (state == NULL)
2883                                 break;
2884                         nfs4_state_mark_reclaim_nograce(clp, state);
2885                 case -NFS4ERR_STALE_CLIENTID:
2886                 case -NFS4ERR_STALE_STATEID:
2887                 case -NFS4ERR_EXPIRED:
2888                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2889                         nfs4_schedule_state_recovery(clp);
2890                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
2891                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2892                         task->tk_status = 0;
2893                         return -EAGAIN;
2894                 case -NFS4ERR_DELAY:
2895                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2896                 case -NFS4ERR_GRACE:
2897                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2898                         task->tk_status = 0;
2899                         return -EAGAIN;
2900                 case -NFS4ERR_OLD_STATEID:
2901                         task->tk_status = 0;
2902                         return -EAGAIN;
2903         }
2904         task->tk_status = nfs4_map_errors(task->tk_status);
2905         return 0;
2906 }
2907
2908 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2909 {
2910         nfs4_verifier sc_verifier;
2911         struct nfs4_setclientid setclientid = {
2912                 .sc_verifier = &sc_verifier,
2913                 .sc_prog = program,
2914         };
2915         struct rpc_message msg = {
2916                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2917                 .rpc_argp = &setclientid,
2918                 .rpc_resp = clp,
2919                 .rpc_cred = cred,
2920         };
2921         __be32 *p;
2922         int loop = 0;
2923         int status;
2924
2925         p = (__be32*)sc_verifier.data;
2926         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2927         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2928
2929         for(;;) {
2930                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2931                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2932                                 clp->cl_ipaddr,
2933                                 rpc_peeraddr2str(clp->cl_rpcclient,
2934                                                         RPC_DISPLAY_ADDR),
2935                                 rpc_peeraddr2str(clp->cl_rpcclient,
2936                                                         RPC_DISPLAY_PROTO),
2937                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2938                                 clp->cl_id_uniquifier);
2939                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2940                                 sizeof(setclientid.sc_netid),
2941                                 rpc_peeraddr2str(clp->cl_rpcclient,
2942                                                         RPC_DISPLAY_NETID));
2943                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2944                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2945                                 clp->cl_ipaddr, port >> 8, port & 255);
2946
2947                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2948                 if (status != -NFS4ERR_CLID_INUSE)
2949                         break;
2950                 if (signalled())
2951                         break;
2952                 if (loop++ & 1)
2953                         ssleep(clp->cl_lease_time + 1);
2954                 else
2955                         if (++clp->cl_id_uniquifier == 0)
2956                                 break;
2957         }
2958         return status;
2959 }
2960
2961 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2962 {
2963         struct nfs_fsinfo fsinfo;
2964         struct rpc_message msg = {
2965                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2966                 .rpc_argp = clp,
2967                 .rpc_resp = &fsinfo,
2968                 .rpc_cred = cred,
2969         };
2970         unsigned long now;
2971         int status;
2972
2973         now = jiffies;
2974         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2975         if (status == 0) {
2976                 spin_lock(&clp->cl_lock);
2977                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2978                 clp->cl_last_renewal = now;
2979                 spin_unlock(&clp->cl_lock);
2980         }
2981         return status;
2982 }
2983
2984 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2985 {
2986         long timeout = 0;
2987         int err;
2988         do {
2989                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2990                 switch (err) {
2991                         case 0:
2992                                 return err;
2993                         case -NFS4ERR_RESOURCE:
2994                                 /* The IBM lawyers misread another document! */
2995                         case -NFS4ERR_DELAY:
2996                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2997                 }
2998         } while (err == 0);
2999         return err;
3000 }
3001
3002 struct nfs4_delegreturndata {
3003         struct nfs4_delegreturnargs args;
3004         struct nfs4_delegreturnres res;
3005         struct nfs_fh fh;
3006         nfs4_stateid stateid;
3007         unsigned long timestamp;
3008         struct nfs_fattr fattr;
3009         int rpc_status;
3010 };
3011
3012 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3013 {
3014         struct nfs4_delegreturndata *data = calldata;
3015         data->rpc_status = task->tk_status;
3016         if (data->rpc_status == 0)
3017                 renew_lease(data->res.server, data->timestamp);
3018 }
3019
3020 static void nfs4_delegreturn_release(void *calldata)
3021 {
3022         kfree(calldata);
3023 }
3024
3025 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3026         .rpc_call_done = nfs4_delegreturn_done,
3027         .rpc_release = nfs4_delegreturn_release,
3028 };
3029
3030 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3031 {
3032         struct nfs4_delegreturndata *data;
3033         struct nfs_server *server = NFS_SERVER(inode);
3034         struct rpc_task *task;
3035         struct rpc_message msg = {
3036                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3037                 .rpc_cred = cred,
3038         };
3039         struct rpc_task_setup task_setup_data = {
3040                 .rpc_client = server->client,
3041                 .rpc_message = &msg,
3042                 .callback_ops = &nfs4_delegreturn_ops,
3043                 .flags = RPC_TASK_ASYNC,
3044         };
3045         int status = 0;
3046
3047         data = kmalloc(sizeof(*data), GFP_KERNEL);
3048         if (data == NULL)
3049                 return -ENOMEM;
3050         data->args.fhandle = &data->fh;
3051         data->args.stateid = &data->stateid;
3052         data->args.bitmask = server->attr_bitmask;
3053         nfs_copy_fh(&data->fh, NFS_FH(inode));
3054         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3055         data->res.fattr = &data->fattr;
3056         data->res.server = server;
3057         nfs_fattr_init(data->res.fattr);
3058         data->timestamp = jiffies;
3059         data->rpc_status = 0;
3060
3061         task_setup_data.callback_data = data;
3062         msg.rpc_argp = &data->args,
3063         msg.rpc_resp = &data->res,
3064         task = rpc_run_task(&task_setup_data);
3065         if (IS_ERR(task))
3066                 return PTR_ERR(task);
3067         if (!issync)
3068                 goto out;
3069         status = nfs4_wait_for_completion_rpc_task(task);
3070         if (status != 0)
3071                 goto out;
3072         status = data->rpc_status;
3073         if (status != 0)
3074                 goto out;
3075         nfs_refresh_inode(inode, &data->fattr);
3076 out:
3077         rpc_put_task(task);
3078         return status;
3079 }
3080
3081 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3082 {
3083         struct nfs_server *server = NFS_SERVER(inode);
3084         struct nfs4_exception exception = { };
3085         int err;
3086         do {
3087                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3088                 switch (err) {
3089                         case -NFS4ERR_STALE_STATEID:
3090                         case -NFS4ERR_EXPIRED:
3091                         case 0:
3092                                 return 0;
3093                 }
3094                 err = nfs4_handle_exception(server, err, &exception);
3095         } while (exception.retry);
3096         return err;
3097 }
3098
3099 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3100 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3101
3102 /*
3103  * sleep, with exponential backoff, and retry the LOCK operation.
3104  */
3105 static unsigned long
3106 nfs4_set_lock_task_retry(unsigned long timeout)
3107 {
3108         schedule_timeout_killable(timeout);
3109         timeout <<= 1;
3110         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3111                 return NFS4_LOCK_MAXTIMEOUT;
3112         return timeout;
3113 }
3114
3115 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3116 {
3117         struct inode *inode = state->inode;
3118         struct nfs_server *server = NFS_SERVER(inode);
3119         struct nfs_client *clp = server->nfs_client;
3120         struct nfs_lockt_args arg = {
3121                 .fh = NFS_FH(inode),
3122                 .fl = request,
3123         };
3124         struct nfs_lockt_res res = {
3125                 .denied = request,
3126         };
3127         struct rpc_message msg = {
3128                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3129                 .rpc_argp       = &arg,
3130                 .rpc_resp       = &res,
3131                 .rpc_cred       = state->owner->so_cred,
3132         };
3133         struct nfs4_lock_state *lsp;
3134         int status;
3135
3136         arg.lock_owner.clientid = clp->cl_clientid;
3137         status = nfs4_set_lock_state(state, request);
3138         if (status != 0)
3139                 goto out;
3140         lsp = request->fl_u.nfs4_fl.owner;
3141         arg.lock_owner.id = lsp->ls_id.id;
3142         status = rpc_call_sync(server->client, &msg, 0);
3143         switch (status) {
3144                 case 0:
3145                         request->fl_type = F_UNLCK;
3146                         break;
3147                 case -NFS4ERR_DENIED:
3148                         status = 0;
3149         }
3150         request->fl_ops->fl_release_private(request);
3151 out:
3152         return status;
3153 }
3154
3155 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3156 {
3157         struct nfs4_exception exception = { };
3158         int err;
3159
3160         do {
3161                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3162                                 _nfs4_proc_getlk(state, cmd, request),
3163                                 &exception);
3164         } while (exception.retry);
3165         return err;
3166 }
3167
3168 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3169 {
3170         int res = 0;
3171         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3172                 case FL_POSIX:
3173                         res = posix_lock_file_wait(file, fl);
3174                         break;
3175                 case FL_FLOCK:
3176                         res = flock_lock_file_wait(file, fl);
3177                         break;
3178                 default:
3179                         BUG();
3180         }
3181         return res;
3182 }
3183
3184 struct nfs4_unlockdata {
3185         struct nfs_locku_args arg;
3186         struct nfs_locku_res res;
3187         struct nfs4_lock_state *lsp;
3188         struct nfs_open_context *ctx;
3189         struct file_lock fl;
3190         const struct nfs_server *server;
3191         unsigned long timestamp;
3192 };
3193
3194 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3195                 struct nfs_open_context *ctx,
3196                 struct nfs4_lock_state *lsp,
3197                 struct nfs_seqid *seqid)
3198 {
3199         struct nfs4_unlockdata *p;
3200         struct inode *inode = lsp->ls_state->inode;
3201
3202         p = kmalloc(sizeof(*p), GFP_KERNEL);
3203         if (p == NULL)
3204                 return NULL;
3205         p->arg.fh = NFS_FH(inode);
3206         p->arg.fl = &p->fl;
3207         p->arg.seqid = seqid;
3208         p->res.seqid = seqid;
3209         p->arg.stateid = &lsp->ls_stateid;
3210         p->lsp = lsp;
3211         atomic_inc(&lsp->ls_count);
3212         /* Ensure we don't close file until we're done freeing locks! */
3213         p->ctx = get_nfs_open_context(ctx);
3214         memcpy(&p->fl, fl, sizeof(p->fl));
3215         p->server = NFS_SERVER(inode);
3216         return p;
3217 }
3218
3219 static void nfs4_locku_release_calldata(void *data)
3220 {
3221         struct nfs4_unlockdata *calldata = data;
3222         nfs_free_seqid(calldata->arg.seqid);
3223         nfs4_put_lock_state(calldata->lsp);
3224         put_nfs_open_context(calldata->ctx);
3225         kfree(calldata);
3226 }
3227
3228 static void nfs4_locku_done(struct rpc_task *task, void *data)
3229 {
3230         struct nfs4_unlockdata *calldata = data;
3231
3232         if (RPC_ASSASSINATED(task))
3233                 return;
3234         switch (task->tk_status) {
3235                 case 0:
3236                         memcpy(calldata->lsp->ls_stateid.data,
3237                                         calldata->res.stateid.data,
3238                                         sizeof(calldata->lsp->ls_stateid.data));
3239                         renew_lease(calldata->server, calldata->timestamp);
3240                         break;
3241                 case -NFS4ERR_BAD_STATEID:
3242                 case -NFS4ERR_OLD_STATEID:
3243                 case -NFS4ERR_STALE_STATEID:
3244                 case -NFS4ERR_EXPIRED:
3245                         break;
3246                 default:
3247                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3248                                 rpc_restart_call(task);
3249         }
3250 }
3251
3252 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3253 {
3254         struct nfs4_unlockdata *calldata = data;
3255
3256         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3257                 return;
3258         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3259                 /* Note: exit _without_ running nfs4_locku_done */
3260                 task->tk_action = NULL;
3261                 return;
3262         }
3263         calldata->timestamp = jiffies;
3264         rpc_call_start(task);
3265 }
3266
3267 static const struct rpc_call_ops nfs4_locku_ops = {
3268         .rpc_call_prepare = nfs4_locku_prepare,
3269         .rpc_call_done = nfs4_locku_done,
3270         .rpc_release = nfs4_locku_release_calldata,
3271 };
3272
3273 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3274                 struct nfs_open_context *ctx,
3275                 struct nfs4_lock_state *lsp,
3276                 struct nfs_seqid *seqid)
3277 {
3278         struct nfs4_unlockdata *data;
3279         struct rpc_message msg = {
3280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3281                 .rpc_cred = ctx->cred,
3282         };
3283         struct rpc_task_setup task_setup_data = {
3284                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3285                 .rpc_message = &msg,
3286                 .callback_ops = &nfs4_locku_ops,
3287                 .workqueue = nfsiod_workqueue,
3288                 .flags = RPC_TASK_ASYNC,
3289         };
3290
3291         /* Ensure this is an unlock - when canceling a lock, the
3292          * canceled lock is passed in, and it won't be an unlock.
3293          */
3294         fl->fl_type = F_UNLCK;
3295
3296         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3297         if (data == NULL) {
3298                 nfs_free_seqid(seqid);
3299                 return ERR_PTR(-ENOMEM);
3300         }
3301
3302         msg.rpc_argp = &data->arg,
3303         msg.rpc_resp = &data->res,
3304         task_setup_data.callback_data = data;
3305         return rpc_run_task(&task_setup_data);
3306 }
3307
3308 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3309 {
3310         struct nfs_inode *nfsi = NFS_I(state->inode);
3311         struct nfs_seqid *seqid;
3312         struct nfs4_lock_state *lsp;
3313         struct rpc_task *task;
3314         int status = 0;
3315         unsigned char fl_flags = request->fl_flags;
3316
3317         status = nfs4_set_lock_state(state, request);
3318         /* Unlock _before_ we do the RPC call */
3319         request->fl_flags |= FL_EXISTS;
3320         down_read(&nfsi->rwsem);
3321         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3322                 up_read(&nfsi->rwsem);
3323                 goto out;
3324         }
3325         up_read(&nfsi->rwsem);
3326         if (status != 0)
3327                 goto out;
3328         /* Is this a delegated lock? */
3329         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3330                 goto out;
3331         lsp = request->fl_u.nfs4_fl.owner;
3332         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3333         status = -ENOMEM;
3334         if (seqid == NULL)
3335                 goto out;
3336         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3337         status = PTR_ERR(task);
3338         if (IS_ERR(task))
3339                 goto out;
3340         status = nfs4_wait_for_completion_rpc_task(task);
3341         rpc_put_task(task);
3342 out:
3343         request->fl_flags = fl_flags;
3344         return status;
3345 }
3346
3347 struct nfs4_lockdata {
3348         struct nfs_lock_args arg;
3349         struct nfs_lock_res res;
3350         struct nfs4_lock_state *lsp;
3351         struct nfs_open_context *ctx;
3352         struct file_lock fl;
3353         unsigned long timestamp;
3354         int rpc_status;
3355         int cancelled;
3356 };
3357
3358 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3359                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3360 {
3361         struct nfs4_lockdata *p;
3362         struct inode *inode = lsp->ls_state->inode;
3363         struct nfs_server *server = NFS_SERVER(inode);
3364
3365         p = kzalloc(sizeof(*p), GFP_KERNEL);
3366         if (p == NULL)
3367                 return NULL;
3368
3369         p->arg.fh = NFS_FH(inode);
3370         p->arg.fl = &p->fl;
3371         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3372         if (p->arg.open_seqid == NULL)
3373                 goto out_free;
3374         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3375         if (p->arg.lock_seqid == NULL)
3376                 goto out_free_seqid;
3377         p->arg.lock_stateid = &lsp->ls_stateid;
3378         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3379         p->arg.lock_owner.id = lsp->ls_id.id;
3380         p->res.lock_seqid = p->arg.lock_seqid;
3381         p->lsp = lsp;
3382         atomic_inc(&lsp->ls_count);
3383         p->ctx = get_nfs_open_context(ctx);
3384         memcpy(&p->fl, fl, sizeof(p->fl));
3385         return p;
3386 out_free_seqid:
3387         nfs_free_seqid(p->arg.open_seqid);
3388 out_free:
3389         kfree(p);
3390         return NULL;
3391 }
3392
3393 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3394 {
3395         struct nfs4_lockdata *data = calldata;
3396         struct nfs4_state *state = data->lsp->ls_state;
3397
3398         dprintk("%s: begin!\n", __func__);
3399         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3400                 return;
3401         /* Do we need to do an open_to_lock_owner? */
3402         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3403                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3404                         return;
3405                 data->arg.open_stateid = &state->stateid;
3406                 data->arg.new_lock_owner = 1;
3407                 data->res.open_seqid = data->arg.open_seqid;
3408         } else
3409                 data->arg.new_lock_owner = 0;
3410         data->timestamp = jiffies;
3411         rpc_call_start(task);
3412         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3413 }
3414
3415 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3416 {
3417         struct nfs4_lockdata *data = calldata;
3418
3419         dprintk("%s: begin!\n", __func__);
3420
3421         data->rpc_status = task->tk_status;
3422         if (RPC_ASSASSINATED(task))
3423                 goto out;
3424         if (data->arg.new_lock_owner != 0) {
3425                 if (data->rpc_status == 0)
3426                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3427                 else
3428                         goto out;
3429         }
3430         if (data->rpc_status == 0) {
3431                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3432                                         sizeof(data->lsp->ls_stateid.data));
3433                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3434                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3435         }
3436 out:
3437         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3438 }
3439
3440 static void nfs4_lock_release(void *calldata)
3441 {
3442         struct nfs4_lockdata *data = calldata;
3443
3444         dprintk("%s: begin!\n", __func__);
3445         nfs_free_seqid(data->arg.open_seqid);
3446         if (data->cancelled != 0) {
3447                 struct rpc_task *task;
3448                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3449                                 data->arg.lock_seqid);
3450                 if (!IS_ERR(task))
3451                         rpc_put_task(task);
3452                 dprintk("%s: cancelling lock!\n", __func__);
3453         } else
3454                 nfs_free_seqid(data->arg.lock_seqid);
3455         nfs4_put_lock_state(data->lsp);
3456         put_nfs_open_context(data->ctx);
3457         kfree(data);
3458         dprintk("%s: done!\n", __func__);
3459 }
3460
3461 static const struct rpc_call_ops nfs4_lock_ops = {
3462         .rpc_call_prepare = nfs4_lock_prepare,
3463         .rpc_call_done = nfs4_lock_done,
3464         .rpc_release = nfs4_lock_release,
3465 };
3466
3467 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3468 {
3469         struct nfs4_lockdata *data;
3470         struct rpc_task *task;
3471         struct rpc_message msg = {
3472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3473                 .rpc_cred = state->owner->so_cred,
3474         };
3475         struct rpc_task_setup task_setup_data = {
3476                 .rpc_client = NFS_CLIENT(state->inode),
3477                 .rpc_message = &msg,
3478                 .callback_ops = &nfs4_lock_ops,
3479                 .workqueue = nfsiod_workqueue,
3480                 .flags = RPC_TASK_ASYNC,
3481         };
3482         int ret;
3483
3484         dprintk("%s: begin!\n", __func__);
3485         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3486                         fl->fl_u.nfs4_fl.owner);
3487         if (data == NULL)
3488                 return -ENOMEM;
3489         if (IS_SETLKW(cmd))
3490                 data->arg.block = 1;
3491         if (reclaim != 0)
3492                 data->arg.reclaim = 1;
3493         msg.rpc_argp = &data->arg,
3494         msg.rpc_resp = &data->res,
3495         task_setup_data.callback_data = data;
3496         task = rpc_run_task(&task_setup_data);
3497         if (IS_ERR(task))
3498                 return PTR_ERR(task);
3499         ret = nfs4_wait_for_completion_rpc_task(task);
3500         if (ret == 0) {
3501                 ret = data->rpc_status;
3502         } else
3503                 data->cancelled = 1;
3504         rpc_put_task(task);
3505         dprintk("%s: done, ret = %d!\n", __func__, ret);
3506         return ret;
3507 }
3508
3509 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3510 {
3511         struct nfs_server *server = NFS_SERVER(state->inode);
3512         struct nfs4_exception exception = { };
3513         int err;
3514
3515         do {
3516                 /* Cache the lock if possible... */
3517                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3518                         return 0;
3519                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3520                 if (err != -NFS4ERR_DELAY)
3521                         break;
3522                 nfs4_handle_exception(server, err, &exception);
3523         } while (exception.retry);
3524         return err;
3525 }
3526
3527 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3528 {
3529         struct nfs_server *server = NFS_SERVER(state->inode);
3530         struct nfs4_exception exception = { };
3531         int err;
3532
3533         err = nfs4_set_lock_state(state, request);
3534         if (err != 0)
3535                 return err;
3536         do {
3537                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3538                         return 0;
3539                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3540                 if (err != -NFS4ERR_DELAY)
3541                         break;
3542                 nfs4_handle_exception(server, err, &exception);
3543         } while (exception.retry);
3544         return err;
3545 }
3546
3547 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3548 {
3549         struct nfs_inode *nfsi = NFS_I(state->inode);
3550         unsigned char fl_flags = request->fl_flags;
3551         int status;
3552
3553         /* Is this a delegated open? */
3554         status = nfs4_set_lock_state(state, request);
3555         if (status != 0)
3556                 goto out;
3557         request->fl_flags |= FL_ACCESS;
3558         status = do_vfs_lock(request->fl_file, request);
3559         if (status < 0)
3560                 goto out;
3561         down_read(&nfsi->rwsem);
3562         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3563                 /* Yes: cache locks! */
3564                 /* ...but avoid races with delegation recall... */
3565                 request->fl_flags = fl_flags & ~FL_SLEEP;
3566                 status = do_vfs_lock(request->fl_file, request);
3567                 goto out_unlock;
3568         }
3569         status = _nfs4_do_setlk(state, cmd, request, 0);
3570         if (status != 0)
3571                 goto out_unlock;
3572         /* Note: we always want to sleep here! */
3573         request->fl_flags = fl_flags | FL_SLEEP;
3574         if (do_vfs_lock(request->fl_file, request) < 0)
3575                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3576 out_unlock:
3577         up_read(&nfsi->rwsem);
3578 out:
3579         request->fl_flags = fl_flags;
3580         return status;
3581 }
3582
3583 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3584 {
3585         struct nfs4_exception exception = { };
3586         int err;
3587
3588         do {
3589                 err = _nfs4_proc_setlk(state, cmd, request);
3590                 if (err == -NFS4ERR_DENIED)
3591                         err = -EAGAIN;
3592                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3593                                 err, &exception);
3594         } while (exception.retry);
3595         return err;
3596 }
3597
3598 static int
3599 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3600 {
3601         struct nfs_open_context *ctx;
3602         struct nfs4_state *state;
3603         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3604         int status;
3605
3606         /* verify open state */
3607         ctx = nfs_file_open_context(filp);
3608         state = ctx->state;
3609
3610         if (request->fl_start < 0 || request->fl_end < 0)
3611                 return -EINVAL;
3612
3613         if (IS_GETLK(cmd))
3614                 return nfs4_proc_getlk(state, F_GETLK, request);
3615
3616         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3617                 return -EINVAL;
3618
3619         if (request->fl_type == F_UNLCK)
3620                 return nfs4_proc_unlck(state, cmd, request);
3621
3622         do {
3623                 status = nfs4_proc_setlk(state, cmd, request);
3624                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3625                         break;
3626                 timeout = nfs4_set_lock_task_retry(timeout);
3627                 status = -ERESTARTSYS;
3628                 if (signalled())
3629                         break;
3630         } while(status < 0);
3631         return status;
3632 }
3633
3634 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3635 {
3636         struct nfs_server *server = NFS_SERVER(state->inode);
3637         struct nfs4_exception exception = { };
3638         int err;
3639
3640         err = nfs4_set_lock_state(state, fl);
3641         if (err != 0)
3642                 goto out;
3643         do {
3644                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3645                 switch (err) {
3646                         default:
3647                                 printk(KERN_ERR "%s: unhandled error %d.\n",
3648                                                 __func__, err);
3649                         case 0:
3650                         case -ESTALE:
3651                                 goto out;
3652                         case -NFS4ERR_EXPIRED:
3653                         case -NFS4ERR_STALE_CLIENTID:
3654                         case -NFS4ERR_STALE_STATEID:
3655                                 nfs4_schedule_state_recovery(server->nfs_client);
3656                                 goto out;
3657                         case -ERESTARTSYS:
3658                                 /*
3659                                  * The show must go on: exit, but mark the
3660                                  * stateid as needing recovery.
3661                                  */
3662                         case -NFS4ERR_ADMIN_REVOKED:
3663                         case -NFS4ERR_BAD_STATEID:
3664                         case -NFS4ERR_OPENMODE:
3665                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
3666                                 err = 0;
3667                                 goto out;
3668                         case -ENOMEM:
3669                         case -NFS4ERR_DENIED:
3670                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
3671                                 err = 0;
3672                                 goto out;
3673                         case -NFS4ERR_DELAY:
3674                                 break;
3675                 }
3676                 err = nfs4_handle_exception(server, err, &exception);
3677         } while (exception.retry);
3678 out:
3679         return err;
3680 }
3681
3682 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3683
3684 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3685                 size_t buflen, int flags)
3686 {
3687         struct inode *inode = dentry->d_inode;
3688
3689         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3690                 return -EOPNOTSUPP;
3691
3692         return nfs4_proc_set_acl(inode, buf, buflen);
3693 }
3694
3695 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3696  * and that's what we'll do for e.g. user attributes that haven't been set.
3697  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3698  * attributes in kernel-managed attribute namespaces. */
3699 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3700                 size_t buflen)
3701 {
3702         struct inode *inode = dentry->d_inode;
3703
3704         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3705                 return -EOPNOTSUPP;
3706
3707         return nfs4_proc_get_acl(inode, buf, buflen);
3708 }
3709
3710 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3711 {
3712         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3713
3714         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3715                 return 0;
3716         if (buf && buflen < len)
3717                 return -ERANGE;
3718         if (buf)
3719                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3720         return len;
3721 }
3722
3723 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
3724 {
3725         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
3726                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
3727                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
3728                 return;
3729
3730         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3731                 NFS_ATTR_FATTR_NLINK;
3732         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3733         fattr->nlink = 2;
3734 }
3735
3736 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3737                 struct nfs4_fs_locations *fs_locations, struct page *page)
3738 {
3739         struct nfs_server *server = NFS_SERVER(dir);
3740         u32 bitmask[2] = {
3741                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3742                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3743         };
3744         struct nfs4_fs_locations_arg args = {
3745                 .dir_fh = NFS_FH(dir),
3746                 .name = name,
3747                 .page = page,
3748                 .bitmask = bitmask,
3749         };
3750         struct rpc_message msg = {
3751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3752                 .rpc_argp = &args,
3753                 .rpc_resp = fs_locations,
3754         };
3755         int status;
3756
3757         dprintk("%s: start\n", __func__);
3758         nfs_fattr_init(&fs_locations->fattr);
3759         fs_locations->server = server;
3760         fs_locations->nlocations = 0;
3761         status = rpc_call_sync(server->client, &msg, 0);
3762         nfs_fixup_referral_attributes(&fs_locations->fattr);
3763         dprintk("%s: returned status = %d\n", __func__, status);
3764         return status;
3765 }
3766
3767 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3768         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
3769         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
3770         .recover_open   = nfs4_open_reclaim,
3771         .recover_lock   = nfs4_lock_reclaim,
3772 };
3773
3774 struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
3775         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
3776         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
3777         .recover_open   = nfs4_open_expired,
3778         .recover_lock   = nfs4_lock_expired,
3779 };
3780
3781 static const struct inode_operations nfs4_file_inode_operations = {
3782         .permission     = nfs_permission,
3783         .getattr        = nfs_getattr,
3784         .setattr        = nfs_setattr,
3785         .getxattr       = nfs4_getxattr,
3786         .setxattr       = nfs4_setxattr,
3787         .listxattr      = nfs4_listxattr,
3788 };
3789
3790 const struct nfs_rpc_ops nfs_v4_clientops = {
3791         .version        = 4,                    /* protocol version */
3792         .dentry_ops     = &nfs4_dentry_operations,
3793         .dir_inode_ops  = &nfs4_dir_inode_operations,
3794         .file_inode_ops = &nfs4_file_inode_operations,
3795         .getroot        = nfs4_proc_get_root,
3796         .getattr        = nfs4_proc_getattr,
3797         .setattr        = nfs4_proc_setattr,
3798         .lookupfh       = nfs4_proc_lookupfh,
3799         .lookup         = nfs4_proc_lookup,
3800         .access         = nfs4_proc_access,
3801         .readlink       = nfs4_proc_readlink,
3802         .create         = nfs4_proc_create,
3803         .remove         = nfs4_proc_remove,
3804         .unlink_setup   = nfs4_proc_unlink_setup,
3805         .unlink_done    = nfs4_proc_unlink_done,
3806         .rename         = nfs4_proc_rename,
3807         .link           = nfs4_proc_link,
3808         .symlink        = nfs4_proc_symlink,
3809         .mkdir          = nfs4_proc_mkdir,
3810         .rmdir          = nfs4_proc_remove,
3811         .readdir        = nfs4_proc_readdir,
3812         .mknod          = nfs4_proc_mknod,
3813         .statfs         = nfs4_proc_statfs,
3814         .fsinfo         = nfs4_proc_fsinfo,
3815         .pathconf       = nfs4_proc_pathconf,
3816         .set_capabilities = nfs4_server_capabilities,
3817         .decode_dirent  = nfs4_decode_dirent,
3818         .read_setup     = nfs4_proc_read_setup,
3819         .read_done      = nfs4_read_done,
3820         .write_setup    = nfs4_proc_write_setup,
3821         .write_done     = nfs4_write_done,
3822         .commit_setup   = nfs4_proc_commit_setup,
3823         .commit_done    = nfs4_commit_done,
3824         .lock           = nfs4_proc_lock,
3825         .clear_acl_cache = nfs4_zap_acl_attr,
3826         .close_context  = nfs4_close_context,
3827 };
3828
3829 /*
3830  * Local variables:
3831  *  c-basic-offset: 8
3832  * End:
3833  */