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   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 "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 212         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 213                 nfs_force_lookup_revalidate(dir);
 214         nfsi->change_attr = cinfo->after;
 215         spin_unlock(&dir->i_lock);
 216 }
 217
 218 struct nfs4_opendata {
 219         struct kref kref;
 220         struct nfs_openargs o_arg;
 221         struct nfs_openres o_res;
 222         struct nfs_open_confirmargs c_arg;
 223         struct nfs_open_confirmres c_res;
 224         struct nfs_fattr f_attr;
 225         struct nfs_fattr dir_attr;
 226         struct path path;
 227         struct dentry *dir;
 228         struct nfs4_state_owner *owner;
 229         struct nfs4_state *state;
 230         struct iattr attrs;
 231         unsigned long timestamp;
 232         unsigned int rpc_done : 1;
 233         int rpc_status;
 234         int cancelled;
 235 };
 236
 237
 238 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 239 {
 240         p->o_res.f_attr = &p->f_attr;
 241         p->o_res.dir_attr = &p->dir_attr;
 242         p->o_res.server = p->o_arg.server;
 243         nfs_fattr_init(&p->f_attr);
 244         nfs_fattr_init(&p->dir_attr);
 245 }
 246
 247 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 248                 struct nfs4_state_owner *sp, int flags,
 249                 const struct iattr *attrs)
 250 {
 251         struct dentry *parent = dget_parent(path->dentry);
 252         struct inode *dir = parent->d_inode;
 253         struct nfs_server *server = NFS_SERVER(dir);
 254         struct nfs4_opendata *p;
 255
 256         p = kzalloc(sizeof(*p), GFP_KERNEL);
 257         if (p == NULL)
 258                 goto err;
 259         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 260         if (p->o_arg.seqid == NULL)
 261                 goto err_free;
 262         p->path.mnt = mntget(path->mnt);
 263         p->path.dentry = dget(path->dentry);
 264         p->dir = parent;
 265         p->owner = sp;
 266         atomic_inc(&sp->so_count);
 267         p->o_arg.fh = NFS_FH(dir);
 268         p->o_arg.open_flags = flags,
 269         p->o_arg.clientid = server->nfs_client->cl_clientid;
 270         p->o_arg.id = sp->so_owner_id.id;
 271         p->o_arg.name = &p->path.dentry->d_name;
 272         p->o_arg.server = server;
 273         p->o_arg.bitmask = server->attr_bitmask;
 274         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 275         if (flags & O_EXCL) {
 276                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 277                 s[0] = jiffies;
 278                 s[1] = current->pid;
 279         } else if (flags & O_CREAT) {
 280                 p->o_arg.u.attrs = &p->attrs;
 281                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 282         }
 283         p->c_arg.fh = &p->o_res.fh;
 284         p->c_arg.stateid = &p->o_res.stateid;
 285         p->c_arg.seqid = p->o_arg.seqid;
 286         nfs4_init_opendata_res(p);
 287         kref_init(&p->kref);
 288         return p;
 289 err_free:
 290         kfree(p);
 291 err:
 292         dput(parent);
 293         return NULL;
 294 }
 295
 296 static void nfs4_opendata_free(struct kref *kref)
 297 {
 298         struct nfs4_opendata *p = container_of(kref,
 299                         struct nfs4_opendata, kref);
 300
 301         nfs_free_seqid(p->o_arg.seqid);
 302         if (p->state != NULL)
 303                 nfs4_put_open_state(p->state);
 304         nfs4_put_state_owner(p->owner);
 305         dput(p->dir);
 306         dput(p->path.dentry);
 307         mntput(p->path.mnt);
 308         kfree(p);
 309 }
 310
 311 static void nfs4_opendata_put(struct nfs4_opendata *p)
 312 {
 313         if (p != NULL)
 314                 kref_put(&p->kref, nfs4_opendata_free);
 315 }
 316
 317 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 318 {
 319         int ret;
 320
 321         ret = rpc_wait_for_completion_task(task);
 322         return ret;
 323 }
 324
 325 static int can_open_cached(struct nfs4_state *state, int mode)
 326 {
 327         int ret = 0;
 328         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 329                 case FMODE_READ:
 330                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 331                         break;
 332                 case FMODE_WRITE:
 333                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_READ|FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 337         }
 338         return ret;
 339 }
 340
 341 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 342 {
 343         if ((delegation->type & open_flags) != open_flags)
 344                 return 0;
 345         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 346                 return 0;
 347         return 1;
 348 }
 349
 350 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 351 {
 352         switch (open_flags) {
 353                 case FMODE_WRITE:
 354                         state->n_wronly++;
 355                         break;
 356                 case FMODE_READ:
 357                         state->n_rdonly++;
 358                         break;
 359                 case FMODE_READ|FMODE_WRITE:
 360                         state->n_rdwr++;
 361         }
 362         nfs4_state_set_mode_locked(state, state->state | open_flags);
 363 }
 364
 365 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 366 {
 367         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 368                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 369         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 370         switch (open_flags) {
 371                 case FMODE_READ:
 372                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 373                         break;
 374                 case FMODE_WRITE:
 375                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 376                         break;
 377                 case FMODE_READ|FMODE_WRITE:
 378                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 379         }
 380 }
 381
 382 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 383 {
 384         write_seqlock(&state->seqlock);
 385         nfs_set_open_stateid_locked(state, stateid, open_flags);
 386         write_sequnlock(&state->seqlock);
 387 }
 388
 389 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 390 {
 391         open_flags &= (FMODE_READ|FMODE_WRITE);
 392         /*
 393          * Protect the call to nfs4_state_set_mode_locked and
 394          * serialise the stateid update
 395          */
 396         write_seqlock(&state->seqlock);
 397         if (deleg_stateid != NULL) {
 398                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 399                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 400         }
 401         if (open_stateid != NULL)
 402                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 403         write_sequnlock(&state->seqlock);
 404         spin_lock(&state->owner->so_lock);
 405         update_open_stateflags(state, open_flags);
 406         spin_unlock(&state->owner->so_lock);
 407 }
 408
 409 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 410 {
 411         struct nfs_delegation *delegation;
 412
 413         rcu_read_lock();
 414         delegation = rcu_dereference(NFS_I(inode)->delegation);
 415         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 416                 rcu_read_unlock();
 417                 return;
 418         }
 419         rcu_read_unlock();
 420         nfs_inode_return_delegation(inode);
 421 }
 422
 423 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 424 {
 425         struct nfs4_state *state = opendata->state;
 426         struct nfs_inode *nfsi = NFS_I(state->inode);
 427         struct nfs_delegation *delegation;
 428         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 429         nfs4_stateid stateid;
 430         int ret = -EAGAIN;
 431
 432         rcu_read_lock();
 433         delegation = rcu_dereference(nfsi->delegation);
 434         for (;;) {
 435                 if (can_open_cached(state, open_mode)) {
 436                         spin_lock(&state->owner->so_lock);
 437                         if (can_open_cached(state, open_mode)) {
 438                                 update_open_stateflags(state, open_mode);
 439                                 spin_unlock(&state->owner->so_lock);
 440                                 rcu_read_unlock();
 441                                 goto out_return_state;
 442                         }
 443                         spin_unlock(&state->owner->so_lock);
 444                 }
 445                 if (delegation == NULL)
 446                         break;
 447                 if (!can_open_delegated(delegation, open_mode))
 448                         break;
 449                 /* Save the delegation */
 450                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 451                 rcu_read_unlock();
 452                 lock_kernel();
 453                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 454                 unlock_kernel();
 455                 if (ret != 0)
 456                         goto out;
 457                 ret = -EAGAIN;
 458                 rcu_read_lock();
 459                 delegation = rcu_dereference(nfsi->delegation);
 460                 /* If no delegation, try a cached open */
 461                 if (delegation == NULL)
 462                         continue;
 463                 /* Is the delegation still valid? */
 464                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 465                         continue;
 466                 rcu_read_unlock();
 467                 update_open_stateid(state, NULL, &stateid, open_mode);
 468                 goto out_return_state;
 469         }
 470         rcu_read_unlock();
 471 out:
 472         return ERR_PTR(ret);
 473 out_return_state:
 474         atomic_inc(&state->count);
 475         return state;
 476 }
 477
 478 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 479 {
 480         struct inode *inode;
 481         struct nfs4_state *state = NULL;
 482         struct nfs_delegation *delegation;
 483         nfs4_stateid *deleg_stateid = NULL;
 484         int ret;
 485
 486         if (!data->rpc_done) {
 487                 state = nfs4_try_open_cached(data);
 488                 goto out;
 489         }
 490
 491         ret = -EAGAIN;
 492         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 493                 goto err;
 494         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 495         ret = PTR_ERR(inode);
 496         if (IS_ERR(inode))
 497                 goto err;
 498         ret = -ENOMEM;
 499         state = nfs4_get_open_state(inode, data->owner);
 500         if (state == NULL)
 501                 goto err_put_inode;
 502         if (data->o_res.delegation_type != 0) {
 503                 int delegation_flags = 0;
 504
 505                 rcu_read_lock();
 506                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 507                 if (delegation)
 508                         delegation_flags = delegation->flags;
 509                 rcu_read_unlock();
 510                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 511                         nfs_inode_set_delegation(state->inode,
 512                                         data->owner->so_cred,
 513                                         &data->o_res);
 514                 else
 515                         nfs_inode_reclaim_delegation(state->inode,
 516                                         data->owner->so_cred,
 517                                         &data->o_res);
 518         }
 519         rcu_read_lock();
 520         delegation = rcu_dereference(NFS_I(inode)->delegation);
 521         if (delegation != NULL)
 522                 deleg_stateid = &delegation->stateid;
 523         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 524         rcu_read_unlock();
 525         iput(inode);
 526 out:
 527         return state;
 528 err_put_inode:
 529         iput(inode);
 530 err:
 531         return ERR_PTR(ret);
 532 }
 533
 534 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 535 {
 536         struct nfs_inode *nfsi = NFS_I(state->inode);
 537         struct nfs_open_context *ctx;
 538
 539         spin_lock(&state->inode->i_lock);
 540         list_for_each_entry(ctx, &nfsi->open_files, list) {
 541                 if (ctx->state != state)
 542                         continue;
 543                 get_nfs_open_context(ctx);
 544                 spin_unlock(&state->inode->i_lock);
 545                 return ctx;
 546         }
 547         spin_unlock(&state->inode->i_lock);
 548         return ERR_PTR(-ENOENT);
 549 }
 550
 551 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 552 {
 553         struct nfs4_opendata *opendata;
 554
 555         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 556         if (opendata == NULL)
 557                 return ERR_PTR(-ENOMEM);
 558         opendata->state = state;
 559         atomic_inc(&state->count);
 560         return opendata;
 561 }
 562
 563 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 564 {
 565         struct nfs4_state *newstate;
 566         int ret;
 567
 568         opendata->o_arg.open_flags = openflags;
 569         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 570         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 571         nfs4_init_opendata_res(opendata);
 572         ret = _nfs4_proc_open(opendata);
 573         if (ret != 0)
 574                 return ret;
 575         newstate = nfs4_opendata_to_nfs4_state(opendata);
 576         if (IS_ERR(newstate))
 577                 return PTR_ERR(newstate);
 578         nfs4_close_state(&opendata->path, newstate, openflags);
 579         *res = newstate;
 580         return 0;
 581 }
 582
 583 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 584 {
 585         struct nfs4_state *newstate;
 586         int ret;
 587
 588         /* memory barrier prior to reading state->n_* */
 589         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 590         smp_rmb();
 591         if (state->n_rdwr != 0) {
 592                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 593                 if (ret != 0)
 594                         return ret;
 595                 if (newstate != state)
 596                         return -ESTALE;
 597         }
 598         if (state->n_wronly != 0) {
 599                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 600                 if (ret != 0)
 601                         return ret;
 602                 if (newstate != state)
 603                         return -ESTALE;
 604         }
 605         if (state->n_rdonly != 0) {
 606                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 607                 if (ret != 0)
 608                         return ret;
 609                 if (newstate != state)
 610                         return -ESTALE;
 611         }
 612         /*
 613          * We may have performed cached opens for all three recoveries.
 614          * Check if we need to update the current stateid.
 615          */
 616         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 617             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 618                 write_seqlock(&state->seqlock);
 619                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 620                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 621                 write_sequnlock(&state->seqlock);
 622         }
 623         return 0;
 624 }
 625
 626 /*
 627  * OPEN_RECLAIM:
 628  *      reclaim state on the server after a reboot.
 629  */
 630 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 631 {
 632         struct nfs_delegation *delegation;
 633         struct nfs4_opendata *opendata;
 634         int delegation_type = 0;
 635         int status;
 636
 637         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 638         if (IS_ERR(opendata))
 639                 return PTR_ERR(opendata);
 640         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 641         opendata->o_arg.fh = NFS_FH(state->inode);
 642         rcu_read_lock();
 643         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 644         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 645                 delegation_type = delegation->type;
 646         rcu_read_unlock();
 647         opendata->o_arg.u.delegation_type = delegation_type;
 648         status = nfs4_open_recover(opendata, state);
 649         nfs4_opendata_put(opendata);
 650         return status;
 651 }
 652
 653 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 654 {
 655         struct nfs_server *server = NFS_SERVER(state->inode);
 656         struct nfs4_exception exception = { };
 657         int err;
 658         do {
 659                 err = _nfs4_do_open_reclaim(ctx, state);
 660                 if (err != -NFS4ERR_DELAY)
 661                         break;
 662                 nfs4_handle_exception(server, err, &exception);
 663         } while (exception.retry);
 664         return err;
 665 }
 666
 667 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 668 {
 669         struct nfs_open_context *ctx;
 670         int ret;
 671
 672         ctx = nfs4_state_find_open_context(state);
 673         if (IS_ERR(ctx))
 674                 return PTR_ERR(ctx);
 675         ret = nfs4_do_open_reclaim(ctx, state);
 676         put_nfs_open_context(ctx);
 677         return ret;
 678 }
 679
 680 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 681 {
 682         struct nfs4_opendata *opendata;
 683         int ret;
 684
 685         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 686         if (IS_ERR(opendata))
 687                 return PTR_ERR(opendata);
 688         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 689         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 690                         sizeof(opendata->o_arg.u.delegation.data));
 691         ret = nfs4_open_recover(opendata, state);
 692         nfs4_opendata_put(opendata);
 693         return ret;
 694 }
 695
 696 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 697 {
 698         struct nfs4_exception exception = { };
 699         struct nfs_server *server = NFS_SERVER(state->inode);
 700         int err;
 701         do {
 702                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 703                 switch (err) {
 704                         case 0:
 705                                 return err;
 706                         case -NFS4ERR_STALE_CLIENTID:
 707                         case -NFS4ERR_STALE_STATEID:
 708                         case -NFS4ERR_EXPIRED:
 709                                 /* Don't recall a delegation if it was lost */
 710                                 nfs4_schedule_state_recovery(server->nfs_client);
 711                                 return err;
 712                 }
 713                 err = nfs4_handle_exception(server, err, &exception);
 714         } while (exception.retry);
 715         return err;
 716 }
 717
 718 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 719 {
 720         struct nfs4_opendata *data = calldata;
 721
 722         data->rpc_status = task->tk_status;
 723         if (RPC_ASSASSINATED(task))
 724                 return;
 725         if (data->rpc_status == 0) {
 726                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 727                                 sizeof(data->o_res.stateid.data));
 728                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 729                 renew_lease(data->o_res.server, data->timestamp);
 730                 data->rpc_done = 1;
 731         }
 732         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 733 }
 734
 735 static void nfs4_open_confirm_release(void *calldata)
 736 {
 737         struct nfs4_opendata *data = calldata;
 738         struct nfs4_state *state = NULL;
 739
 740         /* If this request hasn't been cancelled, do nothing */
 741         if (data->cancelled == 0)
 742                 goto out_free;
 743         /* In case of error, no cleanup! */
 744         if (!data->rpc_done)
 745                 goto out_free;
 746         state = nfs4_opendata_to_nfs4_state(data);
 747         if (!IS_ERR(state))
 748                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 749 out_free:
 750         nfs4_opendata_put(data);
 751 }
 752
 753 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 754         .rpc_call_done = nfs4_open_confirm_done,
 755         .rpc_release = nfs4_open_confirm_release,
 756 };
 757
 758 /*
 759  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 760  */
 761 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 762 {
 763         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 764         struct rpc_task *task;
 765         struct  rpc_message msg = {
 766                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 767                 .rpc_argp = &data->c_arg,
 768                 .rpc_resp = &data->c_res,
 769                 .rpc_cred = data->owner->so_cred,
 770         };
 771         struct rpc_task_setup task_setup_data = {
 772                 .rpc_client = server->client,
 773                 .rpc_message = &msg,
 774                 .callback_ops = &nfs4_open_confirm_ops,
 775                 .callback_data = data,
 776                 .flags = RPC_TASK_ASYNC,
 777         };
 778         int status;
 779
 780         kref_get(&data->kref);
 781         data->rpc_done = 0;
 782         data->rpc_status = 0;
 783         data->timestamp = jiffies;
 784         task = rpc_run_task(&task_setup_data);
 785         if (IS_ERR(task))
 786                 return PTR_ERR(task);
 787         status = nfs4_wait_for_completion_rpc_task(task);
 788         if (status != 0) {
 789                 data->cancelled = 1;
 790                 smp_wmb();
 791         } else
 792                 status = data->rpc_status;
 793         rpc_put_task(task);
 794         return status;
 795 }
 796
 797 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 798 {
 799         struct nfs4_opendata *data = calldata;
 800         struct nfs4_state_owner *sp = data->owner;
 801
 802         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 803                 return;
 804         /*
 805          * Check if we still need to send an OPEN call, or if we can use
 806          * a delegation instead.
 807          */
 808         if (data->state != NULL) {
 809                 struct nfs_delegation *delegation;
 810
 811                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 812                         goto out_no_action;
 813                 rcu_read_lock();
 814                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 815                 if (delegation != NULL &&
 816                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 817                         rcu_read_unlock();
 818                         goto out_no_action;
 819                 }
 820                 rcu_read_unlock();
 821         }
 822         /* Update sequence id. */
 823         data->o_arg.id = sp->so_owner_id.id;
 824         data->o_arg.clientid = sp->so_client->cl_clientid;
 825         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 826                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 827                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 828         }
 829         data->timestamp = jiffies;
 830         rpc_call_start(task);
 831         return;
 832 out_no_action:
 833         task->tk_action = NULL;
 834
 835 }
 836
 837 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 838 {
 839         struct nfs4_opendata *data = calldata;
 840
 841         data->rpc_status = task->tk_status;
 842         if (RPC_ASSASSINATED(task))
 843                 return;
 844         if (task->tk_status == 0) {
 845                 switch (data->o_res.f_attr->mode & S_IFMT) {
 846                         case S_IFREG:
 847                                 break;
 848                         case S_IFLNK:
 849                                 data->rpc_status = -ELOOP;
 850                                 break;
 851                         case S_IFDIR:
 852                                 data->rpc_status = -EISDIR;
 853                                 break;
 854                         default:
 855                                 data->rpc_status = -ENOTDIR;
 856                 }
 857                 renew_lease(data->o_res.server, data->timestamp);
 858                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 859                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 860         }
 861         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 862         data->rpc_done = 1;
 863 }
 864
 865 static void nfs4_open_release(void *calldata)
 866 {
 867         struct nfs4_opendata *data = calldata;
 868         struct nfs4_state *state = NULL;
 869
 870         /* If this request hasn't been cancelled, do nothing */
 871         if (data->cancelled == 0)
 872                 goto out_free;
 873         /* In case of error, no cleanup! */
 874         if (data->rpc_status != 0 || !data->rpc_done)
 875                 goto out_free;
 876         /* In case we need an open_confirm, no cleanup! */
 877         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 878                 goto out_free;
 879         state = nfs4_opendata_to_nfs4_state(data);
 880         if (!IS_ERR(state))
 881                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 882 out_free:
 883         nfs4_opendata_put(data);
 884 }
 885
 886 static const struct rpc_call_ops nfs4_open_ops = {
 887         .rpc_call_prepare = nfs4_open_prepare,
 888         .rpc_call_done = nfs4_open_done,
 889         .rpc_release = nfs4_open_release,
 890 };
 891
 892 /*
 893  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 894  */
 895 static int _nfs4_proc_open(struct nfs4_opendata *data)
 896 {
 897         struct inode *dir = data->dir->d_inode;
 898         struct nfs_server *server = NFS_SERVER(dir);
 899         struct nfs_openargs *o_arg = &data->o_arg;
 900         struct nfs_openres *o_res = &data->o_res;
 901         struct rpc_task *task;
 902         struct rpc_message msg = {
 903                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 904                 .rpc_argp = o_arg,
 905                 .rpc_resp = o_res,
 906                 .rpc_cred = data->owner->so_cred,
 907         };
 908         struct rpc_task_setup task_setup_data = {
 909                 .rpc_client = server->client,
 910                 .rpc_message = &msg,
 911                 .callback_ops = &nfs4_open_ops,
 912                 .callback_data = data,
 913                 .flags = RPC_TASK_ASYNC,
 914         };
 915         int status;
 916
 917         kref_get(&data->kref);
 918         data->rpc_done = 0;
 919         data->rpc_status = 0;
 920         data->cancelled = 0;
 921         task = rpc_run_task(&task_setup_data);
 922         if (IS_ERR(task))
 923                 return PTR_ERR(task);
 924         status = nfs4_wait_for_completion_rpc_task(task);
 925         if (status != 0) {
 926                 data->cancelled = 1;
 927                 smp_wmb();
 928         } else
 929                 status = data->rpc_status;
 930         rpc_put_task(task);
 931         if (status != 0 || !data->rpc_done)
 932                 return status;
 933
 934         if (o_res->fh.size == 0)
 935                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 936
 937         if (o_arg->open_flags & O_CREAT) {
 938                 update_changeattr(dir, &o_res->cinfo);
 939                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 940         } else
 941                 nfs_refresh_inode(dir, o_res->dir_attr);
 942         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 943                 status = _nfs4_proc_open_confirm(data);
 944                 if (status != 0)
 945                         return status;
 946         }
 947         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 948                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 949         return 0;
 950 }
 951
 952 static int nfs4_recover_expired_lease(struct nfs_server *server)
 953 {
 954         struct nfs_client *clp = server->nfs_client;
 955         int ret;
 956
 957         for (;;) {
 958                 ret = nfs4_wait_clnt_recover(server->client, clp);
 959                 if (ret != 0)
 960                         return ret;
 961                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 962                         break;
 963                 nfs4_schedule_state_recovery(clp);
 964         }
 965         return 0;
 966 }
 967
 968 /*
 969  * OPEN_EXPIRED:
 970  *      reclaim state on the server after a network partition.
 971  *      Assumes caller holds the appropriate lock
 972  */
 973 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 974 {
 975         struct nfs4_opendata *opendata;
 976         int ret;
 977
 978         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 979         if (IS_ERR(opendata))
 980                 return PTR_ERR(opendata);
 981         ret = nfs4_open_recover(opendata, state);
 982         if (ret == -ESTALE) {
 983                 /* Invalidate the state owner so we don't ever use it again */
 984                 nfs4_drop_state_owner(state->owner);
 985                 d_drop(ctx->path.dentry);
 986         }
 987         nfs4_opendata_put(opendata);
 988         return ret;
 989 }
 990
 991 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 992 {
 993         struct nfs_server *server = NFS_SERVER(state->inode);
 994         struct nfs4_exception exception = { };
 995         int err;
 996
 997         do {
 998                 err = _nfs4_open_expired(ctx, state);
 999                 if (err == -NFS4ERR_DELAY)
1000                         nfs4_handle_exception(server, err, &exception);
1001         } while (exception.retry);
1002         return err;
1003 }
1004
1005 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1006 {
1007         struct nfs_open_context *ctx;
1008         int ret;
1009
1010         ctx = nfs4_state_find_open_context(state);
1011         if (IS_ERR(ctx))
1012                 return PTR_ERR(ctx);
1013         ret = nfs4_do_open_expired(ctx, state);
1014         put_nfs_open_context(ctx);
1015         return ret;
1016 }
1017
1018 /*
1019  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1020  * fields corresponding to attributes that were used to store the verifier.
1021  * Make sure we clobber those fields in the later setattr call
1022  */
1023 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1024 {
1025         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1026             !(sattr->ia_valid & ATTR_ATIME_SET))
1027                 sattr->ia_valid |= ATTR_ATIME;
1028
1029         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1030             !(sattr->ia_valid & ATTR_MTIME_SET))
1031                 sattr->ia_valid |= ATTR_MTIME;
1032 }
1033
1034 /*
1035  * Returns a referenced nfs4_state
1036  */
1037 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1038 {
1039         struct nfs4_state_owner  *sp;
1040         struct nfs4_state     *state = NULL;
1041         struct nfs_server       *server = NFS_SERVER(dir);
1042         struct nfs_client *clp = server->nfs_client;
1043         struct nfs4_opendata *opendata;
1044         int status;
1045
1046         /* Protect against reboot recovery conflicts */
1047         status = -ENOMEM;
1048         if (!(sp = nfs4_get_state_owner(server, cred))) {
1049                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1050                 goto out_err;
1051         }
1052         status = nfs4_recover_expired_lease(server);
1053         if (status != 0)
1054                 goto err_put_state_owner;
1055         if (path->dentry->d_inode != NULL)
1056                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1057         down_read(&clp->cl_sem);
1058         status = -ENOMEM;
1059         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1060         if (opendata == NULL)
1061                 goto err_release_rwsem;
1062
1063         if (path->dentry->d_inode != NULL)
1064                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1065
1066         status = _nfs4_proc_open(opendata);
1067         if (status != 0)
1068                 goto err_opendata_put;
1069
1070         if (opendata->o_arg.open_flags & O_EXCL)
1071                 nfs4_exclusive_attrset(opendata, sattr);
1072
1073         state = nfs4_opendata_to_nfs4_state(opendata);
1074         status = PTR_ERR(state);
1075         if (IS_ERR(state))
1076                 goto err_opendata_put;
1077         nfs4_opendata_put(opendata);
1078         nfs4_put_state_owner(sp);
1079         up_read(&clp->cl_sem);
1080         *res = state;
1081         return 0;
1082 err_opendata_put:
1083         nfs4_opendata_put(opendata);
1084 err_release_rwsem:
1085         up_read(&clp->cl_sem);
1086 err_put_state_owner:
1087         nfs4_put_state_owner(sp);
1088 out_err:
1089         *res = NULL;
1090         return status;
1091 }
1092
1093
1094 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1095 {
1096         struct nfs4_exception exception = { };
1097         struct nfs4_state *res;
1098         int status;
1099
1100         do {
1101                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1102                 if (status == 0)
1103                         break;
1104                 /* NOTE: BAD_SEQID means the server and client disagree about the
1105                  * book-keeping w.r.t. state-changing operations
1106                  * (OPEN/CLOSE/LOCK/LOCKU...)
1107                  * It is actually a sign of a bug on the client or on the server.
1108                  *
1109                  * If we receive a BAD_SEQID error in the particular case of
1110                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1111                  * have unhashed the old state_owner for us, and that we can
1112                  * therefore safely retry using a new one. We should still warn
1113                  * the user though...
1114                  */
1115                 if (status == -NFS4ERR_BAD_SEQID) {
1116                         printk(KERN_WARNING "NFS: v4 server %s "
1117                                         " returned a bad sequence-id error!\n",
1118                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1119                         exception.retry = 1;
1120                         continue;
1121                 }
1122                 /*
1123                  * BAD_STATEID on OPEN means that the server cancelled our
1124                  * state before it received the OPEN_CONFIRM.
1125                  * Recover by retrying the request as per the discussion
1126                  * on Page 181 of RFC3530.
1127                  */
1128                 if (status == -NFS4ERR_BAD_STATEID) {
1129                         exception.retry = 1;
1130                         continue;
1131                 }
1132                 if (status == -EAGAIN) {
1133                         /* We must have found a delegation */
1134                         exception.retry = 1;
1135                         continue;
1136                 }
1137                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1138                                         status, &exception));
1139         } while (exception.retry);
1140         return res;
1141 }
1142
1143 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1144                 struct iattr *sattr, struct nfs4_state *state)
1145 {
1146         struct nfs_server *server = NFS_SERVER(inode);
1147         struct nfs_setattrargs  arg = {
1148                 .fh             = NFS_FH(inode),
1149                 .iap            = sattr,
1150                 .server         = server,
1151                 .bitmask = server->attr_bitmask,
1152         };
1153         struct nfs_setattrres  res = {
1154                 .fattr          = fattr,
1155                 .server         = server,
1156         };
1157         struct rpc_message msg = {
1158                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1159                 .rpc_argp       = &arg,
1160                 .rpc_resp       = &res,
1161         };
1162         unsigned long timestamp = jiffies;
1163         int status;
1164
1165         nfs_fattr_init(fattr);
1166
1167         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1168                 /* Use that stateid */
1169         } else if (state != NULL) {
1170                 msg.rpc_cred = state->owner->so_cred;
1171                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1172         } else
1173                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1174
1175         status = rpc_call_sync(server->client, &msg, 0);
1176         if (status == 0 && state != NULL)
1177                 renew_lease(server, timestamp);
1178         return status;
1179 }
1180
1181 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1182                 struct iattr *sattr, struct nfs4_state *state)
1183 {
1184         struct nfs_server *server = NFS_SERVER(inode);
1185         struct nfs4_exception exception = { };
1186         int err;
1187         do {
1188                 err = nfs4_handle_exception(server,
1189                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1190                                 &exception);
1191         } while (exception.retry);
1192         return err;
1193 }
1194
1195 struct nfs4_closedata {
1196         struct path path;
1197         struct inode *inode;
1198         struct nfs4_state *state;
1199         struct nfs_closeargs arg;
1200         struct nfs_closeres res;
1201         struct nfs_fattr fattr;
1202         unsigned long timestamp;
1203 };
1204
1205 static void nfs4_free_closedata(void *data)
1206 {
1207         struct nfs4_closedata *calldata = data;
1208         struct nfs4_state_owner *sp = calldata->state->owner;
1209
1210         nfs4_put_open_state(calldata->state);
1211         nfs_free_seqid(calldata->arg.seqid);
1212         nfs4_put_state_owner(sp);
1213         dput(calldata->path.dentry);
1214         mntput(calldata->path.mnt);
1215         kfree(calldata);
1216 }
1217
1218 static void nfs4_close_done(struct rpc_task *task, void *data)
1219 {
1220         struct nfs4_closedata *calldata = data;
1221         struct nfs4_state *state = calldata->state;
1222         struct nfs_server *server = NFS_SERVER(calldata->inode);
1223
1224         if (RPC_ASSASSINATED(task))
1225                 return;
1226         /* hmm. we are done with the inode, and in the process of freeing
1227          * the state_owner. we keep this around to process errors
1228          */
1229         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1230         switch (task->tk_status) {
1231                 case 0:
1232                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1233                         renew_lease(server, calldata->timestamp);
1234                         break;
1235                 case -NFS4ERR_STALE_STATEID:
1236                 case -NFS4ERR_EXPIRED:
1237                         break;
1238                 default:
1239                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1240                                 rpc_restart_call(task);
1241                                 return;
1242                         }
1243         }
1244         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1245 }
1246
1247 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1248 {
1249         struct nfs4_closedata *calldata = data;
1250         struct nfs4_state *state = calldata->state;
1251         int clear_rd, clear_wr, clear_rdwr;
1252
1253         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1254                 return;
1255
1256         clear_rd = clear_wr = clear_rdwr = 0;
1257         spin_lock(&state->owner->so_lock);
1258         /* Calculate the change in open mode */
1259         if (state->n_rdwr == 0) {
1260                 if (state->n_rdonly == 0) {
1261                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1262                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1263                 }
1264                 if (state->n_wronly == 0) {
1265                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1266                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1267                 }
1268         }
1269         spin_unlock(&state->owner->so_lock);
1270         if (!clear_rd && !clear_wr && !clear_rdwr) {
1271                 /* Note: exit _without_ calling nfs4_close_done */
1272                 task->tk_action = NULL;
1273                 return;
1274         }
1275         nfs_fattr_init(calldata->res.fattr);
1276         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1277                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1278                 calldata->arg.open_flags = FMODE_READ;
1279         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1280                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1281                 calldata->arg.open_flags = FMODE_WRITE;
1282         }
1283         calldata->timestamp = jiffies;
1284         rpc_call_start(task);
1285 }
1286
1287 static const struct rpc_call_ops nfs4_close_ops = {
1288         .rpc_call_prepare = nfs4_close_prepare,
1289         .rpc_call_done = nfs4_close_done,
1290         .rpc_release = nfs4_free_closedata,
1291 };
1292
1293 /*
1294  * It is possible for data to be read/written from a mem-mapped file
1295  * after the sys_close call (which hits the vfs layer as a flush).
1296  * This means that we can't safely call nfsv4 close on a file until
1297  * the inode is cleared. This in turn means that we are not good
1298  * NFSv4 citizens - we do not indicate to the server to update the file's
1299  * share state even when we are done with one of the three share
1300  * stateid's in the inode.
1301  *
1302  * NOTE: Caller must be holding the sp->so_owner semaphore!
1303  */
1304 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1305 {
1306         struct nfs_server *server = NFS_SERVER(state->inode);
1307         struct nfs4_closedata *calldata;
1308         struct nfs4_state_owner *sp = state->owner;
1309         struct rpc_task *task;
1310         struct rpc_message msg = {
1311                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1312                 .rpc_cred = state->owner->so_cred,
1313         };
1314         struct rpc_task_setup task_setup_data = {
1315                 .rpc_client = server->client,
1316                 .rpc_message = &msg,
1317                 .callback_ops = &nfs4_close_ops,
1318                 .flags = RPC_TASK_ASYNC,
1319         };
1320         int status = -ENOMEM;
1321
1322         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1323         if (calldata == NULL)
1324                 goto out;
1325         calldata->inode = state->inode;
1326         calldata->state = state;
1327         calldata->arg.fh = NFS_FH(state->inode);
1328         calldata->arg.stateid = &state->open_stateid;
1329         /* Serialization for the sequence id */
1330         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1331         if (calldata->arg.seqid == NULL)
1332                 goto out_free_calldata;
1333         calldata->arg.bitmask = server->attr_bitmask;
1334         calldata->res.fattr = &calldata->fattr;
1335         calldata->res.server = server;
1336         calldata->path.mnt = mntget(path->mnt);
1337         calldata->path.dentry = dget(path->dentry);
1338
1339         msg.rpc_argp = &calldata->arg,
1340         msg.rpc_resp = &calldata->res,
1341         task_setup_data.callback_data = calldata;
1342         task = rpc_run_task(&task_setup_data);
1343         if (IS_ERR(task))
1344                 return PTR_ERR(task);
1345         status = 0;
1346         if (wait)
1347                 status = rpc_wait_for_completion_task(task);
1348         rpc_put_task(task);
1349         return status;
1350 out_free_calldata:
1351         kfree(calldata);
1352 out:
1353         nfs4_put_open_state(state);
1354         nfs4_put_state_owner(sp);
1355         return status;
1356 }
1357
1358 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1359 {
1360         struct file *filp;
1361         int ret;
1362
1363         /* If the open_intent is for execute, we have an extra check to make */
1364         if (nd->intent.open.flags & FMODE_EXEC) {
1365                 ret = nfs_may_open(state->inode,
1366                                 state->owner->so_cred,
1367                                 nd->intent.open.flags);
1368                 if (ret < 0)
1369                         goto out_close;
1370         }
1371         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1372         if (!IS_ERR(filp)) {
1373                 struct nfs_open_context *ctx;
1374                 ctx = nfs_file_open_context(filp);
1375                 ctx->state = state;
1376                 return 0;
1377         }
1378         ret = PTR_ERR(filp);
1379 out_close:
1380         nfs4_close_sync(path, state, nd->intent.open.flags);
1381         return ret;
1382 }
1383
1384 struct dentry *
1385 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1386 {
1387         struct path path = {
1388                 .mnt = nd->path.mnt,
1389                 .dentry = dentry,
1390         };
1391         struct dentry *parent;
1392         struct iattr attr;
1393         struct rpc_cred *cred;
1394         struct nfs4_state *state;
1395         struct dentry *res;
1396
1397         if (nd->flags & LOOKUP_CREATE) {
1398                 attr.ia_mode = nd->intent.open.create_mode;
1399                 attr.ia_valid = ATTR_MODE;
1400                 if (!IS_POSIXACL(dir))
1401                         attr.ia_mode &= ~current->fs->umask;
1402         } else {
1403                 attr.ia_valid = 0;
1404                 BUG_ON(nd->intent.open.flags & O_CREAT);
1405         }
1406
1407         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1408         if (IS_ERR(cred))
1409                 return (struct dentry *)cred;
1410         parent = dentry->d_parent;
1411         /* Protect against concurrent sillydeletes */
1412         nfs_block_sillyrename(parent);
1413         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1414         put_rpccred(cred);
1415         if (IS_ERR(state)) {
1416                 if (PTR_ERR(state) == -ENOENT) {
1417                         d_add(dentry, NULL);
1418                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1419                 }
1420                 nfs_unblock_sillyrename(parent);
1421                 return (struct dentry *)state;
1422         }
1423         res = d_add_unique(dentry, igrab(state->inode));
1424         if (res != NULL)
1425                 path.dentry = res;
1426         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1427         nfs_unblock_sillyrename(parent);
1428         nfs4_intent_set_file(nd, &path, state);
1429         return res;
1430 }
1431
1432 int
1433 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1434 {
1435         struct path path = {
1436                 .mnt = nd->path.mnt,
1437                 .dentry = dentry,
1438         };
1439         struct rpc_cred *cred;
1440         struct nfs4_state *state;
1441
1442         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1443         if (IS_ERR(cred))
1444                 return PTR_ERR(cred);
1445         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1446         put_rpccred(cred);
1447         if (IS_ERR(state)) {
1448                 switch (PTR_ERR(state)) {
1449                         case -EPERM:
1450                         case -EACCES:
1451                         case -EDQUOT:
1452                         case -ENOSPC:
1453                         case -EROFS:
1454                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1455                                 return 1;
1456                         default:
1457                                 goto out_drop;
1458                 }
1459         }
1460         if (state->inode == dentry->d_inode) {
1461                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1462                 nfs4_intent_set_file(nd, &path, state);
1463                 return 1;
1464         }
1465         nfs4_close_sync(&path, state, openflags);
1466 out_drop:
1467         d_drop(dentry);
1468         return 0;
1469 }
1470
1471
1472 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1473 {
1474         struct nfs4_server_caps_res res = {};
1475         struct rpc_message msg = {
1476                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1477                 .rpc_argp = fhandle,
1478                 .rpc_resp = &res,
1479         };
1480         int status;
1481
1482         status = rpc_call_sync(server->client, &msg, 0);
1483         if (status == 0) {
1484                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1485                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1486                         server->caps |= NFS_CAP_ACLS;
1487                 if (res.has_links != 0)
1488                         server->caps |= NFS_CAP_HARDLINKS;
1489                 if (res.has_symlinks != 0)
1490                         server->caps |= NFS_CAP_SYMLINKS;
1491                 server->acl_bitmask = res.acl_bitmask;
1492         }
1493         return status;
1494 }
1495
1496 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1497 {
1498         struct nfs4_exception exception = { };
1499         int err;
1500         do {
1501                 err = nfs4_handle_exception(server,
1502                                 _nfs4_server_capabilities(server, fhandle),
1503                                 &exception);
1504         } while (exception.retry);
1505         return err;
1506 }
1507
1508 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1509                 struct nfs_fsinfo *info)
1510 {
1511         struct nfs4_lookup_root_arg args = {
1512                 .bitmask = nfs4_fattr_bitmap,
1513         };
1514         struct nfs4_lookup_res res = {
1515                 .server = server,
1516                 .fattr = info->fattr,
1517                 .fh = fhandle,
1518         };
1519         struct rpc_message msg = {
1520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1521                 .rpc_argp = &args,
1522                 .rpc_resp = &res,
1523         };
1524         nfs_fattr_init(info->fattr);
1525         return rpc_call_sync(server->client, &msg, 0);
1526 }
1527
1528 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1529                 struct nfs_fsinfo *info)
1530 {
1531         struct nfs4_exception exception = { };
1532         int err;
1533         do {
1534                 err = nfs4_handle_exception(server,
1535                                 _nfs4_lookup_root(server, fhandle, info),
1536                                 &exception);
1537         } while (exception.retry);
1538         return err;
1539 }
1540
1541 /*
1542  * get the file handle for the "/" directory on the server
1543  */
1544 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1545                               struct nfs_fsinfo *info)
1546 {
1547         int status;
1548
1549         status = nfs4_lookup_root(server, fhandle, info);
1550         if (status == 0)
1551                 status = nfs4_server_capabilities(server, fhandle);
1552         if (status == 0)
1553                 status = nfs4_do_fsinfo(server, fhandle, info);
1554         return nfs4_map_errors(status);
1555 }
1556
1557 /*
1558  * Get locations and (maybe) other attributes of a referral.
1559  * Note that we'll actually follow the referral later when
1560  * we detect fsid mismatch in inode revalidation
1561  */
1562 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1563 {
1564         int status = -ENOMEM;
1565         struct page *page = NULL;
1566         struct nfs4_fs_locations *locations = NULL;
1567
1568         page = alloc_page(GFP_KERNEL);
1569         if (page == NULL)
1570                 goto out;
1571         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1572         if (locations == NULL)
1573                 goto out;
1574
1575         status = nfs4_proc_fs_locations(dir, name, locations, page);
1576         if (status != 0)
1577                 goto out;
1578         /* Make sure server returned a different fsid for the referral */
1579         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1580                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1581                 status = -EIO;
1582                 goto out;
1583         }
1584
1585         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1586         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1587         if (!fattr->mode)
1588                 fattr->mode = S_IFDIR;
1589         memset(fhandle, 0, sizeof(struct nfs_fh));
1590 out:
1591         if (page)
1592                 __free_page(page);
1593         if (locations)
1594                 kfree(locations);
1595         return status;
1596 }
1597
1598 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1599 {
1600         struct nfs4_getattr_arg args = {
1601                 .fh = fhandle,
1602                 .bitmask = server->attr_bitmask,
1603         };
1604         struct nfs4_getattr_res res = {
1605                 .fattr = fattr,
1606                 .server = server,
1607         };
1608         struct rpc_message msg = {
1609                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1610                 .rpc_argp = &args,
1611                 .rpc_resp = &res,
1612         };
1613
1614         nfs_fattr_init(fattr);
1615         return rpc_call_sync(server->client, &msg, 0);
1616 }
1617
1618 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1619 {
1620         struct nfs4_exception exception = { };
1621         int err;
1622         do {
1623                 err = nfs4_handle_exception(server,
1624                                 _nfs4_proc_getattr(server, fhandle, fattr),
1625                                 &exception);
1626         } while (exception.retry);
1627         return err;
1628 }
1629
1630 /*
1631  * The file is not closed if it is opened due to the a request to change
1632  * the size of the file. The open call will not be needed once the
1633  * VFS layer lookup-intents are implemented.
1634  *
1635  * Close is called when the inode is destroyed.
1636  * If we haven't opened the file for O_WRONLY, we
1637  * need to in the size_change case to obtain a stateid.
1638  *
1639  * Got race?
1640  * Because OPEN is always done by name in nfsv4, it is
1641  * possible that we opened a different file by the same
1642  * name.  We can recognize this race condition, but we
1643  * can't do anything about it besides returning an error.
1644  *
1645  * This will be fixed with VFS changes (lookup-intent).
1646  */
1647 static int
1648 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1649                   struct iattr *sattr)
1650 {
1651         struct rpc_cred *cred;
1652         struct inode *inode = dentry->d_inode;
1653         struct nfs_open_context *ctx;
1654         struct nfs4_state *state = NULL;
1655         int status;
1656
1657         nfs_fattr_init(fattr);
1658
1659         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1660         if (IS_ERR(cred))
1661                 return PTR_ERR(cred);
1662
1663         /* Search for an existing open(O_WRITE) file */
1664         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1665         if (ctx != NULL)
1666                 state = ctx->state;
1667
1668         status = nfs4_do_setattr(inode, fattr, sattr, state);
1669         if (status == 0)
1670                 nfs_setattr_update_inode(inode, sattr);
1671         if (ctx != NULL)
1672                 put_nfs_open_context(ctx);
1673         put_rpccred(cred);
1674         return status;
1675 }
1676
1677 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1678                 const struct qstr *name, struct nfs_fh *fhandle,
1679                 struct nfs_fattr *fattr)
1680 {
1681         int                    status;
1682         struct nfs4_lookup_arg args = {
1683                 .bitmask = server->attr_bitmask,
1684                 .dir_fh = dirfh,
1685                 .name = name,
1686         };
1687         struct nfs4_lookup_res res = {
1688                 .server = server,
1689                 .fattr = fattr,
1690                 .fh = fhandle,
1691         };
1692         struct rpc_message msg = {
1693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1694                 .rpc_argp = &args,
1695                 .rpc_resp = &res,
1696         };
1697
1698         nfs_fattr_init(fattr);
1699
1700         dprintk("NFS call  lookupfh %s\n", name->name);
1701         status = rpc_call_sync(server->client, &msg, 0);
1702         dprintk("NFS reply lookupfh: %d\n", status);
1703         return status;
1704 }
1705
1706 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1707                               struct qstr *name, struct nfs_fh *fhandle,
1708                               struct nfs_fattr *fattr)
1709 {
1710         struct nfs4_exception exception = { };
1711         int err;
1712         do {
1713                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1714                 /* FIXME: !!!! */
1715                 if (err == -NFS4ERR_MOVED) {
1716                         err = -EREMOTE;
1717                         break;
1718                 }
1719                 err = nfs4_handle_exception(server, err, &exception);
1720         } while (exception.retry);
1721         return err;
1722 }
1723
1724 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1725                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1726 {
1727         int status;
1728
1729         dprintk("NFS call  lookup %s\n", name->name);
1730         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1731         if (status == -NFS4ERR_MOVED)
1732                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1733         dprintk("NFS reply lookup: %d\n", status);
1734         return status;
1735 }
1736
1737 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1738 {
1739         struct nfs4_exception exception = { };
1740         int err;
1741         do {
1742                 err = nfs4_handle_exception(NFS_SERVER(dir),
1743                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1744                                 &exception);
1745         } while (exception.retry);
1746         return err;
1747 }
1748
1749 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1750 {
1751         struct nfs_server *server = NFS_SERVER(inode);
1752         struct nfs_fattr fattr;
1753         struct nfs4_accessargs args = {
1754                 .fh = NFS_FH(inode),
1755                 .bitmask = server->attr_bitmask,
1756         };
1757         struct nfs4_accessres res = {
1758                 .server = server,
1759                 .fattr = &fattr,
1760         };
1761         struct rpc_message msg = {
1762                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1763                 .rpc_argp = &args,
1764                 .rpc_resp = &res,
1765                 .rpc_cred = entry->cred,
1766         };
1767         int mode = entry->mask;
1768         int status;
1769
1770         /*
1771          * Determine which access bits we want to ask for...
1772          */
1773         if (mode & MAY_READ)
1774                 args.access |= NFS4_ACCESS_READ;
1775         if (S_ISDIR(inode->i_mode)) {
1776                 if (mode & MAY_WRITE)
1777                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1778                 if (mode & MAY_EXEC)
1779                         args.access |= NFS4_ACCESS_LOOKUP;
1780         } else {
1781                 if (mode & MAY_WRITE)
1782                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1783                 if (mode & MAY_EXEC)
1784                         args.access |= NFS4_ACCESS_EXECUTE;
1785         }
1786         nfs_fattr_init(&fattr);
1787         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1788         if (!status) {
1789                 entry->mask = 0;
1790                 if (res.access & NFS4_ACCESS_READ)
1791                         entry->mask |= MAY_READ;
1792                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1793                         entry->mask |= MAY_WRITE;
1794                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1795                         entry->mask |= MAY_EXEC;
1796                 nfs_refresh_inode(inode, &fattr);
1797         }
1798         return status;
1799 }
1800
1801 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1802 {
1803         struct nfs4_exception exception = { };
1804         int err;
1805         do {
1806                 err = nfs4_handle_exception(NFS_SERVER(inode),
1807                                 _nfs4_proc_access(inode, entry),
1808                                 &exception);
1809         } while (exception.retry);
1810         return err;
1811 }
1812
1813 /*
1814  * TODO: For the time being, we don't try to get any attributes
1815  * along with any of the zero-copy operations READ, READDIR,
1816  * READLINK, WRITE.
1817  *
1818  * In the case of the first three, we want to put the GETATTR
1819  * after the read-type operation -- this is because it is hard
1820  * to predict the length of a GETATTR response in v4, and thus
1821  * align the READ data correctly.  This means that the GETATTR
1822  * may end up partially falling into the page cache, and we should
1823  * shift it into the 'tail' of the xdr_buf before processing.
1824  * To do this efficiently, we need to know the total length
1825  * of data received, which doesn't seem to be available outside
1826  * of the RPC layer.
1827  *
1828  * In the case of WRITE, we also want to put the GETATTR after
1829  * the operation -- in this case because we want to make sure
1830  * we get the post-operation mtime and size.  This means that
1831  * we can't use xdr_encode_pages() as written: we need a variant
1832  * of it which would leave room in the 'tail' iovec.
1833  *
1834  * Both of these changes to the XDR layer would in fact be quite
1835  * minor, but I decided to leave them for a subsequent patch.
1836  */
1837 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1838                 unsigned int pgbase, unsigned int pglen)
1839 {
1840         struct nfs4_readlink args = {
1841                 .fh       = NFS_FH(inode),
1842                 .pgbase   = pgbase,
1843                 .pglen    = pglen,
1844                 .pages    = &page,
1845         };
1846         struct rpc_message msg = {
1847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1848                 .rpc_argp = &args,
1849                 .rpc_resp = NULL,
1850         };
1851
1852         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1853 }
1854
1855 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1856                 unsigned int pgbase, unsigned int pglen)
1857 {
1858         struct nfs4_exception exception = { };
1859         int err;
1860         do {
1861                 err = nfs4_handle_exception(NFS_SERVER(inode),
1862                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1863                                 &exception);
1864         } while (exception.retry);
1865         return err;
1866 }
1867
1868 /*
1869  * Got race?
1870  * We will need to arrange for the VFS layer to provide an atomic open.
1871  * Until then, this create/open method is prone to inefficiency and race
1872  * conditions due to the lookup, create, and open VFS calls from sys_open()
1873  * placed on the wire.
1874  *
1875  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1876  * The file will be opened again in the subsequent VFS open call
1877  * (nfs4_proc_file_open).
1878  *
1879  * The open for read will just hang around to be used by any process that
1880  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1881  */
1882
1883 static int
1884 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1885                  int flags, struct nameidata *nd)
1886 {
1887         struct path path = {
1888                 .mnt = nd->path.mnt,
1889                 .dentry = dentry,
1890         };
1891         struct nfs4_state *state;
1892         struct rpc_cred *cred;
1893         int status = 0;
1894
1895         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1896         if (IS_ERR(cred)) {
1897                 status = PTR_ERR(cred);
1898                 goto out;
1899         }
1900         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1901         put_rpccred(cred);
1902         d_drop(dentry);
1903         if (IS_ERR(state)) {
1904                 status = PTR_ERR(state);
1905                 goto out;
1906         }
1907         d_add(dentry, igrab(state->inode));
1908         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1909         if (flags & O_EXCL) {
1910                 struct nfs_fattr fattr;
1911                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1912                 if (status == 0)
1913                         nfs_setattr_update_inode(state->inode, sattr);
1914                 nfs_post_op_update_inode(state->inode, &fattr);
1915         }
1916         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1917                 status = nfs4_intent_set_file(nd, &path, state);
1918         else
1919                 nfs4_close_sync(&path, state, flags);
1920 out:
1921         return status;
1922 }
1923
1924 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1925 {
1926         struct nfs_server *server = NFS_SERVER(dir);
1927         struct nfs_removeargs args = {
1928                 .fh = NFS_FH(dir),
1929                 .name.len = name->len,
1930                 .name.name = name->name,
1931                 .bitmask = server->attr_bitmask,
1932         };
1933         struct nfs_removeres res = {
1934                 .server = server,
1935         };
1936         struct rpc_message msg = {
1937                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1938                 .rpc_argp = &args,
1939                 .rpc_resp = &res,
1940         };
1941         int                     status;
1942
1943         nfs_fattr_init(&res.dir_attr);
1944         status = rpc_call_sync(server->client, &msg, 0);
1945         if (status == 0) {
1946                 update_changeattr(dir, &res.cinfo);
1947                 nfs_post_op_update_inode(dir, &res.dir_attr);
1948         }
1949         return status;
1950 }
1951
1952 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1953 {
1954         struct nfs4_exception exception = { };
1955         int err;
1956         do {
1957                 err = nfs4_handle_exception(NFS_SERVER(dir),
1958                                 _nfs4_proc_remove(dir, name),
1959                                 &exception);
1960         } while (exception.retry);
1961         return err;
1962 }
1963
1964 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1965 {
1966         struct nfs_server *server = NFS_SERVER(dir);
1967         struct nfs_removeargs *args = msg->rpc_argp;
1968         struct nfs_removeres *res = msg->rpc_resp;
1969
1970         args->bitmask = server->attr_bitmask;
1971         res->server = server;
1972         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1973 }
1974
1975 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1976 {
1977         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1978
1979         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1980                 return 0;
1981         update_changeattr(dir, &res->cinfo);
1982         nfs_post_op_update_inode(dir, &res->dir_attr);
1983         return 1;
1984 }
1985
1986 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1987                 struct inode *new_dir, struct qstr *new_name)
1988 {
1989         struct nfs_server *server = NFS_SERVER(old_dir);
1990         struct nfs4_rename_arg arg = {
1991                 .old_dir = NFS_FH(old_dir),
1992                 .new_dir = NFS_FH(new_dir),
1993                 .old_name = old_name,
1994                 .new_name = new_name,
1995                 .bitmask = server->attr_bitmask,
1996         };
1997         struct nfs_fattr old_fattr, new_fattr;
1998         struct nfs4_rename_res res = {
1999                 .server = server,
2000                 .old_fattr = &old_fattr,
2001                 .new_fattr = &new_fattr,
2002         };
2003         struct rpc_message msg = {
2004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2005                 .rpc_argp = &arg,
2006                 .rpc_resp = &res,
2007         };
2008         int                     status;
2009
2010         nfs_fattr_init(res.old_fattr);
2011         nfs_fattr_init(res.new_fattr);
2012         status = rpc_call_sync(server->client, &msg, 0);
2013
2014         if (!status) {
2015                 update_changeattr(old_dir, &res.old_cinfo);
2016                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2017                 update_changeattr(new_dir, &res.new_cinfo);
2018                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2019         }
2020         return status;
2021 }
2022
2023 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2024                 struct inode *new_dir, struct qstr *new_name)
2025 {
2026         struct nfs4_exception exception = { };
2027         int err;
2028         do {
2029                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2030                                 _nfs4_proc_rename(old_dir, old_name,
2031                                         new_dir, new_name),
2032                                 &exception);
2033         } while (exception.retry);
2034         return err;
2035 }
2036
2037 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2038 {
2039         struct nfs_server *server = NFS_SERVER(inode);
2040         struct nfs4_link_arg arg = {
2041                 .fh     = NFS_FH(inode),
2042                 .dir_fh = NFS_FH(dir),
2043                 .name   = name,
2044                 .bitmask = server->attr_bitmask,
2045         };
2046         struct nfs_fattr fattr, dir_attr;
2047         struct nfs4_link_res res = {
2048                 .server = server,
2049                 .fattr = &fattr,
2050                 .dir_attr = &dir_attr,
2051         };
2052         struct rpc_message msg = {
2053                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2054                 .rpc_argp = &arg,
2055                 .rpc_resp = &res,
2056         };
2057         int                     status;
2058
2059         nfs_fattr_init(res.fattr);
2060         nfs_fattr_init(res.dir_attr);
2061         status = rpc_call_sync(server->client, &msg, 0);
2062         if (!status) {
2063                 update_changeattr(dir, &res.cinfo);
2064                 nfs_post_op_update_inode(dir, res.dir_attr);
2065                 nfs_post_op_update_inode(inode, res.fattr);
2066         }
2067
2068         return status;
2069 }
2070
2071 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2072 {
2073         struct nfs4_exception exception = { };
2074         int err;
2075         do {
2076                 err = nfs4_handle_exception(NFS_SERVER(inode),
2077                                 _nfs4_proc_link(inode, dir, name),
2078                                 &exception);
2079         } while (exception.retry);
2080         return err;
2081 }
2082
2083 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2084                 struct page *page, unsigned int len, struct iattr *sattr)
2085 {
2086         struct nfs_server *server = NFS_SERVER(dir);
2087         struct nfs_fh fhandle;
2088         struct nfs_fattr fattr, dir_fattr;
2089         struct nfs4_create_arg arg = {
2090                 .dir_fh = NFS_FH(dir),
2091                 .server = server,
2092                 .name = &dentry->d_name,
2093                 .attrs = sattr,
2094                 .ftype = NF4LNK,
2095                 .bitmask = server->attr_bitmask,
2096         };
2097         struct nfs4_create_res res = {
2098                 .server = server,
2099                 .fh = &fhandle,
2100                 .fattr = &fattr,
2101                 .dir_fattr = &dir_fattr,
2102         };
2103         struct rpc_message msg = {
2104                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2105                 .rpc_argp = &arg,
2106                 .rpc_resp = &res,
2107         };
2108         int                     status;
2109
2110         if (len > NFS4_MAXPATHLEN)
2111                 return -ENAMETOOLONG;
2112
2113         arg.u.symlink.pages = &page;
2114         arg.u.symlink.len = len;
2115         nfs_fattr_init(&fattr);
2116         nfs_fattr_init(&dir_fattr);
2117
2118         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2119         if (!status) {
2120                 update_changeattr(dir, &res.dir_cinfo);
2121                 nfs_post_op_update_inode(dir, res.dir_fattr);
2122                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2123         }
2124         return status;
2125 }
2126
2127 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2128                 struct page *page, unsigned int len, struct iattr *sattr)
2129 {
2130         struct nfs4_exception exception = { };
2131         int err;
2132         do {
2133                 err = nfs4_handle_exception(NFS_SERVER(dir),
2134                                 _nfs4_proc_symlink(dir, dentry, page,
2135                                                         len, sattr),
2136                                 &exception);
2137         } while (exception.retry);
2138         return err;
2139 }
2140
2141 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2142                 struct iattr *sattr)
2143 {
2144         struct nfs_server *server = NFS_SERVER(dir);
2145         struct nfs_fh fhandle;
2146         struct nfs_fattr fattr, dir_fattr;
2147         struct nfs4_create_arg arg = {
2148                 .dir_fh = NFS_FH(dir),
2149                 .server = server,
2150                 .name = &dentry->d_name,
2151                 .attrs = sattr,
2152                 .ftype = NF4DIR,
2153                 .bitmask = server->attr_bitmask,
2154         };
2155         struct nfs4_create_res res = {
2156                 .server = server,
2157                 .fh = &fhandle,
2158                 .fattr = &fattr,
2159                 .dir_fattr = &dir_fattr,
2160         };
2161         struct rpc_message msg = {
2162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2163                 .rpc_argp = &arg,
2164                 .rpc_resp = &res,
2165         };
2166         int                     status;
2167
2168         nfs_fattr_init(&fattr);
2169         nfs_fattr_init(&dir_fattr);
2170
2171         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2172         if (!status) {
2173                 update_changeattr(dir, &res.dir_cinfo);
2174                 nfs_post_op_update_inode(dir, res.dir_fattr);
2175                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2176         }
2177         return status;
2178 }
2179
2180 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2181                 struct iattr *sattr)
2182 {
2183         struct nfs4_exception exception = { };
2184         int err;
2185         do {
2186                 err = nfs4_handle_exception(NFS_SERVER(dir),
2187                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2188                                 &exception);
2189         } while (exception.retry);
2190         return err;
2191 }
2192
2193 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2194                   u64 cookie, struct page *page, unsigned int count, int plus)
2195 {
2196         struct inode            *dir = dentry->d_inode;
2197         struct nfs4_readdir_arg args = {
2198                 .fh = NFS_FH(dir),
2199                 .pages = &page,
2200                 .pgbase = 0,
2201                 .count = count,
2202                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2203         };
2204         struct nfs4_readdir_res res;
2205         struct rpc_message msg = {
2206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2207                 .rpc_argp = &args,
2208                 .rpc_resp = &res,
2209                 .rpc_cred = cred,
2210         };
2211         int                     status;
2212
2213         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2214                         dentry->d_parent->d_name.name,
2215                         dentry->d_name.name,
2216                         (unsigned long long)cookie);
2217         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2218         res.pgbase = args.pgbase;
2219         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2220         if (status == 0)
2221                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2222
2223         nfs_invalidate_atime(dir);
2224
2225         dprintk("%s: returns %d\n", __FUNCTION__, status);
2226         return status;
2227 }
2228
2229 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2230                   u64 cookie, struct page *page, unsigned int count, int plus)
2231 {
2232         struct nfs4_exception exception = { };
2233         int err;
2234         do {
2235                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2236                                 _nfs4_proc_readdir(dentry, cred, cookie,
2237                                         page, count, plus),
2238                                 &exception);
2239         } while (exception.retry);
2240         return err;
2241 }
2242
2243 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2244                 struct iattr *sattr, dev_t rdev)
2245 {
2246         struct nfs_server *server = NFS_SERVER(dir);
2247         struct nfs_fh fh;
2248         struct nfs_fattr fattr, dir_fattr;
2249         struct nfs4_create_arg arg = {
2250                 .dir_fh = NFS_FH(dir),
2251                 .server = server,
2252                 .name = &dentry->d_name,
2253                 .attrs = sattr,
2254                 .bitmask = server->attr_bitmask,
2255         };
2256         struct nfs4_create_res res = {
2257                 .server = server,
2258                 .fh = &fh,
2259                 .fattr = &fattr,
2260                 .dir_fattr = &dir_fattr,
2261         };
2262         struct rpc_message msg = {
2263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2264                 .rpc_argp = &arg,
2265                 .rpc_resp = &res,
2266         };
2267         int                     status;
2268         int                     mode = sattr->ia_mode;
2269
2270         nfs_fattr_init(&fattr);
2271         nfs_fattr_init(&dir_fattr);
2272
2273         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2274         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2275         if (S_ISFIFO(mode))
2276                 arg.ftype = NF4FIFO;
2277         else if (S_ISBLK(mode)) {
2278                 arg.ftype = NF4BLK;
2279                 arg.u.device.specdata1 = MAJOR(rdev);
2280                 arg.u.device.specdata2 = MINOR(rdev);
2281         }
2282         else if (S_ISCHR(mode)) {
2283                 arg.ftype = NF4CHR;
2284                 arg.u.device.specdata1 = MAJOR(rdev);
2285                 arg.u.device.specdata2 = MINOR(rdev);
2286         }
2287         else
2288                 arg.ftype = NF4SOCK;
2289
2290         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2291         if (status == 0) {
2292                 update_changeattr(dir, &res.dir_cinfo);
2293                 nfs_post_op_update_inode(dir, res.dir_fattr);
2294                 status = nfs_instantiate(dentry, &fh, &fattr);
2295         }
2296         return status;
2297 }
2298
2299 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2300                 struct iattr *sattr, dev_t rdev)
2301 {
2302         struct nfs4_exception exception = { };
2303         int err;
2304         do {
2305                 err = nfs4_handle_exception(NFS_SERVER(dir),
2306                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2307                                 &exception);
2308         } while (exception.retry);
2309         return err;
2310 }
2311
2312 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2313                  struct nfs_fsstat *fsstat)
2314 {
2315         struct nfs4_statfs_arg args = {
2316                 .fh = fhandle,
2317                 .bitmask = server->attr_bitmask,
2318         };
2319         struct rpc_message msg = {
2320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2321                 .rpc_argp = &args,
2322                 .rpc_resp = fsstat,
2323         };
2324
2325         nfs_fattr_init(fsstat->fattr);
2326         return rpc_call_sync(server->client, &msg, 0);
2327 }
2328
2329 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2330 {
2331         struct nfs4_exception exception = { };
2332         int err;
2333         do {
2334                 err = nfs4_handle_exception(server,
2335                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2336                                 &exception);
2337         } while (exception.retry);
2338         return err;
2339 }
2340
2341 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2342                 struct nfs_fsinfo *fsinfo)
2343 {
2344         struct nfs4_fsinfo_arg args = {
2345                 .fh = fhandle,
2346                 .bitmask = server->attr_bitmask,
2347         };
2348         struct rpc_message msg = {
2349                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2350                 .rpc_argp = &args,
2351                 .rpc_resp = fsinfo,
2352         };
2353
2354         return rpc_call_sync(server->client, &msg, 0);
2355 }
2356
2357 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2358 {
2359         struct nfs4_exception exception = { };
2360         int err;
2361
2362         do {
2363                 err = nfs4_handle_exception(server,
2364                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2365                                 &exception);
2366         } while (exception.retry);
2367         return err;
2368 }
2369
2370 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2371 {
2372         nfs_fattr_init(fsinfo->fattr);
2373         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2374 }
2375
2376 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2377                 struct nfs_pathconf *pathconf)
2378 {
2379         struct nfs4_pathconf_arg args = {
2380                 .fh = fhandle,
2381                 .bitmask = server->attr_bitmask,
2382         };
2383         struct rpc_message msg = {
2384                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2385                 .rpc_argp = &args,
2386                 .rpc_resp = pathconf,
2387         };
2388
2389         /* None of the pathconf attributes are mandatory to implement */
2390         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2391                 memset(pathconf, 0, sizeof(*pathconf));
2392                 return 0;
2393         }
2394
2395         nfs_fattr_init(pathconf->fattr);
2396         return rpc_call_sync(server->client, &msg, 0);
2397 }
2398
2399 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2400                 struct nfs_pathconf *pathconf)
2401 {
2402         struct nfs4_exception exception = { };
2403         int err;
2404
2405         do {
2406                 err = nfs4_handle_exception(server,
2407                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2408                                 &exception);
2409         } while (exception.retry);
2410         return err;
2411 }
2412
2413 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2414 {
2415         struct nfs_server *server = NFS_SERVER(data->inode);
2416
2417         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2418                 rpc_restart_call(task);
2419                 return -EAGAIN;
2420         }
2421
2422         nfs_invalidate_atime(data->inode);
2423         if (task->tk_status > 0)
2424                 renew_lease(server, data->timestamp);
2425         return 0;
2426 }
2427
2428 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2429 {
2430         data->timestamp   = jiffies;
2431         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2432 }
2433
2434 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2435 {
2436         struct inode *inode = data->inode;
2437
2438         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2439                 rpc_restart_call(task);
2440                 return -EAGAIN;
2441         }
2442         if (task->tk_status >= 0) {
2443                 renew_lease(NFS_SERVER(inode), data->timestamp);
2444                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2445         }
2446         return 0;
2447 }
2448
2449 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2450 {
2451         struct nfs_server *server = NFS_SERVER(data->inode);
2452
2453         data->args.bitmask = server->attr_bitmask;
2454         data->res.server = server;
2455         data->timestamp   = jiffies;
2456
2457         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2458 }
2459
2460 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2461 {
2462         struct inode *inode = data->inode;
2463
2464         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2465                 rpc_restart_call(task);
2466                 return -EAGAIN;
2467         }
2468         nfs_refresh_inode(inode, data->res.fattr);
2469         return 0;
2470 }
2471
2472 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2473 {
2474         struct nfs_server *server = NFS_SERVER(data->inode);
2475
2476         data->args.bitmask = server->attr_bitmask;
2477         data->res.server = server;
2478         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2479 }
2480
2481 /*
2482  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2483  * standalone procedure for queueing an asynchronous RENEW.
2484  */
2485 static void nfs4_renew_done(struct rpc_task *task, void *data)
2486 {
2487         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2488         unsigned long timestamp = (unsigned long)data;
2489
2490         if (task->tk_status < 0) {
2491                 switch (task->tk_status) {
2492                         case -NFS4ERR_STALE_CLIENTID:
2493                         case -NFS4ERR_EXPIRED:
2494                         case -NFS4ERR_CB_PATH_DOWN:
2495                                 nfs4_schedule_state_recovery(clp);
2496                 }
2497                 return;
2498         }
2499         spin_lock(&clp->cl_lock);
2500         if (time_before(clp->cl_last_renewal,timestamp))
2501                 clp->cl_last_renewal = timestamp;
2502         spin_unlock(&clp->cl_lock);
2503 }
2504
2505 static const struct rpc_call_ops nfs4_renew_ops = {
2506         .rpc_call_done = nfs4_renew_done,
2507 };
2508
2509 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2510 {
2511         struct rpc_message msg = {
2512                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2513                 .rpc_argp       = clp,
2514                 .rpc_cred       = cred,
2515         };
2516
2517         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2518                         &nfs4_renew_ops, (void *)jiffies);
2519 }
2520
2521 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2522 {
2523         struct rpc_message msg = {
2524                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2525                 .rpc_argp       = clp,
2526                 .rpc_cred       = cred,
2527         };
2528         unsigned long now = jiffies;
2529         int status;
2530
2531         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2532         if (status < 0)
2533                 return status;
2534         spin_lock(&clp->cl_lock);
2535         if (time_before(clp->cl_last_renewal,now))
2536                 clp->cl_last_renewal = now;
2537         spin_unlock(&clp->cl_lock);
2538         return 0;
2539 }
2540
2541 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2542 {
2543         return (server->caps & NFS_CAP_ACLS)
2544                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2545                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2546 }
2547
2548 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2549  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2550  * the stack.
2551  */
2552 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2553
2554 static void buf_to_pages(const void *buf, size_t buflen,
2555                 struct page **pages, unsigned int *pgbase)
2556 {
2557         const void *p = buf;
2558
2559         *pgbase = offset_in_page(buf);
2560         p -= *pgbase;
2561         while (p < buf + buflen) {
2562                 *(pages++) = virt_to_page(p);
2563                 p += PAGE_CACHE_SIZE;
2564         }
2565 }
2566
2567 struct nfs4_cached_acl {
2568         int cached;
2569         size_t len;
2570         char data[0];
2571 };
2572
2573 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2574 {
2575         struct nfs_inode *nfsi = NFS_I(inode);
2576
2577         spin_lock(&inode->i_lock);
2578         kfree(nfsi->nfs4_acl);
2579         nfsi->nfs4_acl = acl;
2580         spin_unlock(&inode->i_lock);
2581 }
2582
2583 static void nfs4_zap_acl_attr(struct inode *inode)
2584 {
2585         nfs4_set_cached_acl(inode, NULL);
2586 }
2587
2588 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2589 {
2590         struct nfs_inode *nfsi = NFS_I(inode);
2591         struct nfs4_cached_acl *acl;
2592         int ret = -ENOENT;
2593
2594         spin_lock(&inode->i_lock);
2595         acl = nfsi->nfs4_acl;
2596         if (acl == NULL)
2597                 goto out;
2598         if (buf == NULL) /* user is just asking for length */
2599                 goto out_len;
2600         if (acl->cached == 0)
2601                 goto out;
2602         ret = -ERANGE; /* see getxattr(2) man page */
2603         if (acl->len > buflen)
2604                 goto out;
2605         memcpy(buf, acl->data, acl->len);
2606 out_len:
2607         ret = acl->len;
2608 out:
2609         spin_unlock(&inode->i_lock);
2610         return ret;
2611 }
2612
2613 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2614 {
2615         struct nfs4_cached_acl *acl;
2616
2617         if (buf && acl_len <= PAGE_SIZE) {
2618                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2619                 if (acl == NULL)
2620                         goto out;
2621                 acl->cached = 1;
2622                 memcpy(acl->data, buf, acl_len);
2623         } else {
2624                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2625                 if (acl == NULL)
2626                         goto out;
2627                 acl->cached = 0;
2628         }
2629         acl->len = acl_len;
2630 out:
2631         nfs4_set_cached_acl(inode, acl);
2632 }
2633
2634 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2635 {
2636         struct page *pages[NFS4ACL_MAXPAGES];
2637         struct nfs_getaclargs args = {
2638                 .fh = NFS_FH(inode),
2639                 .acl_pages = pages,
2640                 .acl_len = buflen,
2641         };
2642         size_t resp_len = buflen;
2643         void *resp_buf;
2644         struct rpc_message msg = {
2645                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2646                 .rpc_argp = &args,
2647                 .rpc_resp = &resp_len,
2648         };
2649         struct page *localpage = NULL;
2650         int ret;
2651
2652         if (buflen < PAGE_SIZE) {
2653                 /* As long as we're doing a round trip to the server anyway,
2654                  * let's be prepared for a page of acl data. */
2655                 localpage = alloc_page(GFP_KERNEL);
2656                 resp_buf = page_address(localpage);
2657                 if (localpage == NULL)
2658                         return -ENOMEM;
2659                 args.acl_pages[0] = localpage;
2660                 args.acl_pgbase = 0;
2661                 resp_len = args.acl_len = PAGE_SIZE;
2662         } else {
2663                 resp_buf = buf;
2664                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2665         }
2666         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2667         if (ret)
2668                 goto out_free;
2669         if (resp_len > args.acl_len)
2670                 nfs4_write_cached_acl(inode, NULL, resp_len);
2671         else
2672                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2673         if (buf) {
2674                 ret = -ERANGE;
2675                 if (resp_len > buflen)
2676                         goto out_free;
2677                 if (localpage)
2678                         memcpy(buf, resp_buf, resp_len);
2679         }
2680         ret = resp_len;
2681 out_free:
2682         if (localpage)
2683                 __free_page(localpage);
2684         return ret;
2685 }
2686
2687 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2688 {
2689         struct nfs4_exception exception = { };
2690         ssize_t ret;
2691         do {
2692                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2693                 if (ret >= 0)
2694                         break;
2695                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2696         } while (exception.retry);
2697         return ret;
2698 }
2699
2700 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2701 {
2702         struct nfs_server *server = NFS_SERVER(inode);
2703         int ret;
2704
2705         if (!nfs4_server_supports_acls(server))
2706                 return -EOPNOTSUPP;
2707         ret = nfs_revalidate_inode(server, inode);
2708         if (ret < 0)
2709                 return ret;
2710         ret = nfs4_read_cached_acl(inode, buf, buflen);
2711         if (ret != -ENOENT)
2712                 return ret;
2713         return nfs4_get_acl_uncached(inode, buf, buflen);
2714 }
2715
2716 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2717 {
2718         struct nfs_server *server = NFS_SERVER(inode);
2719         struct page *pages[NFS4ACL_MAXPAGES];
2720         struct nfs_setaclargs arg = {
2721                 .fh             = NFS_FH(inode),
2722                 .acl_pages      = pages,
2723                 .acl_len        = buflen,
2724         };
2725         struct rpc_message msg = {
2726                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2727                 .rpc_argp       = &arg,
2728                 .rpc_resp       = NULL,
2729         };
2730         int ret;
2731
2732         if (!nfs4_server_supports_acls(server))
2733                 return -EOPNOTSUPP;
2734         nfs_inode_return_delegation(inode);
2735         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2736         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2737         nfs_zap_caches(inode);
2738         return ret;
2739 }
2740
2741 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2742 {
2743         struct nfs4_exception exception = { };
2744         int err;
2745         do {
2746                 err = nfs4_handle_exception(NFS_SERVER(inode),
2747                                 __nfs4_proc_set_acl(inode, buf, buflen),
2748                                 &exception);
2749         } while (exception.retry);
2750         return err;
2751 }
2752
2753 static int
2754 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2755 {
2756         struct nfs_client *clp = server->nfs_client;
2757
2758         if (!clp || task->tk_status >= 0)
2759                 return 0;
2760         switch(task->tk_status) {
2761                 case -NFS4ERR_STALE_CLIENTID:
2762                 case -NFS4ERR_STALE_STATEID:
2763                 case -NFS4ERR_EXPIRED:
2764                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2765                         nfs4_schedule_state_recovery(clp);
2766                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2767                                 rpc_wake_up_task(task);
2768                         task->tk_status = 0;
2769                         return -EAGAIN;
2770                 case -NFS4ERR_DELAY:
2771                         nfs_inc_server_stats((struct nfs_server *) server,
2772                                                 NFSIOS_DELAY);
2773                 case -NFS4ERR_GRACE:
2774                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2775                         task->tk_status = 0;
2776                         return -EAGAIN;
2777                 case -NFS4ERR_OLD_STATEID:
2778                         task->tk_status = 0;
2779                         return -EAGAIN;
2780         }
2781         task->tk_status = nfs4_map_errors(task->tk_status);
2782         return 0;
2783 }
2784
2785 static int nfs4_wait_bit_killable(void *word)
2786 {
2787         if (fatal_signal_pending(current))
2788                 return -ERESTARTSYS;
2789         schedule();
2790         return 0;
2791 }
2792
2793 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2794 {
2795         int res;
2796
2797         might_sleep();
2798
2799         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2800
2801         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2802                         nfs4_wait_bit_killable, TASK_KILLABLE);
2803
2804         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2805         return res;
2806 }
2807
2808 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2809 {
2810         int res = 0;
2811
2812         might_sleep();
2813
2814         if (*timeout <= 0)
2815                 *timeout = NFS4_POLL_RETRY_MIN;
2816         if (*timeout > NFS4_POLL_RETRY_MAX)
2817                 *timeout = NFS4_POLL_RETRY_MAX;
2818         schedule_timeout_killable(*timeout);
2819         if (fatal_signal_pending(current))
2820                 res = -ERESTARTSYS;
2821         *timeout <<= 1;
2822         return res;
2823 }
2824
2825 /* This is the error handling routine for processes that are allowed
2826  * to sleep.
2827  */
2828 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2829 {
2830         struct nfs_client *clp = server->nfs_client;
2831         int ret = errorcode;
2832
2833         exception->retry = 0;
2834         switch(errorcode) {
2835                 case 0:
2836                         return 0;
2837                 case -NFS4ERR_STALE_CLIENTID:
2838                 case -NFS4ERR_STALE_STATEID:
2839                 case -NFS4ERR_EXPIRED:
2840                         nfs4_schedule_state_recovery(clp);
2841                         ret = nfs4_wait_clnt_recover(server->client, clp);
2842                         if (ret == 0)
2843                                 exception->retry = 1;
2844                         break;
2845                 case -NFS4ERR_FILE_OPEN:
2846                 case -NFS4ERR_GRACE:
2847                 case -NFS4ERR_DELAY:
2848                         ret = nfs4_delay(server->client, &exception->timeout);
2849                         if (ret != 0)
2850                                 break;
2851                 case -NFS4ERR_OLD_STATEID:
2852                         exception->retry = 1;
2853         }
2854         /* We failed to handle the error */
2855         return nfs4_map_errors(ret);
2856 }
2857
2858 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2859 {
2860         nfs4_verifier sc_verifier;
2861         struct nfs4_setclientid setclientid = {
2862                 .sc_verifier = &sc_verifier,
2863                 .sc_prog = program,
2864         };
2865         struct rpc_message msg = {
2866                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2867                 .rpc_argp = &setclientid,
2868                 .rpc_resp = clp,
2869                 .rpc_cred = cred,
2870         };
2871         __be32 *p;
2872         int loop = 0;
2873         int status;
2874
2875         p = (__be32*)sc_verifier.data;
2876         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2877         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2878
2879         for(;;) {
2880                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2881                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2882                                 clp->cl_ipaddr,
2883                                 rpc_peeraddr2str(clp->cl_rpcclient,
2884                                                         RPC_DISPLAY_ADDR),
2885                                 rpc_peeraddr2str(clp->cl_rpcclient,
2886                                                         RPC_DISPLAY_PROTO),
2887                                 cred->cr_ops->cr_name,
2888                                 clp->cl_id_uniquifier);
2889                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2890                                 sizeof(setclientid.sc_netid),
2891                                 rpc_peeraddr2str(clp->cl_rpcclient,
2892                                                         RPC_DISPLAY_NETID));
2893                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2894                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2895                                 clp->cl_ipaddr, port >> 8, port & 255);
2896
2897                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2898                 if (status != -NFS4ERR_CLID_INUSE)
2899                         break;
2900                 if (signalled())
2901                         break;
2902                 if (loop++ & 1)
2903                         ssleep(clp->cl_lease_time + 1);
2904                 else
2905                         if (++clp->cl_id_uniquifier == 0)
2906                                 break;
2907         }
2908         return status;
2909 }
2910
2911 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2912 {
2913         struct nfs_fsinfo fsinfo;
2914         struct rpc_message msg = {
2915                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2916                 .rpc_argp = clp,
2917                 .rpc_resp = &fsinfo,
2918                 .rpc_cred = cred,
2919         };
2920         unsigned long now;
2921         int status;
2922
2923         now = jiffies;
2924         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2925         if (status == 0) {
2926                 spin_lock(&clp->cl_lock);
2927                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2928                 clp->cl_last_renewal = now;
2929                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2930                 spin_unlock(&clp->cl_lock);
2931         }
2932         return status;
2933 }
2934
2935 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2936 {
2937         long timeout;
2938         int err;
2939         do {
2940                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2941                 switch (err) {
2942                         case 0:
2943                                 return err;
2944                         case -NFS4ERR_RESOURCE:
2945                                 /* The IBM lawyers misread another document! */
2946                         case -NFS4ERR_DELAY:
2947                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2948                 }
2949         } while (err == 0);
2950         return err;
2951 }
2952
2953 struct nfs4_delegreturndata {
2954         struct nfs4_delegreturnargs args;
2955         struct nfs4_delegreturnres res;
2956         struct nfs_fh fh;
2957         nfs4_stateid stateid;
2958         unsigned long timestamp;
2959         struct nfs_fattr fattr;
2960         int rpc_status;
2961 };
2962
2963 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2964 {
2965         struct nfs4_delegreturndata *data = calldata;
2966         data->rpc_status = task->tk_status;
2967         if (data->rpc_status == 0)
2968                 renew_lease(data->res.server, data->timestamp);
2969 }
2970
2971 static void nfs4_delegreturn_release(void *calldata)
2972 {
2973         kfree(calldata);
2974 }
2975
2976 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2977         .rpc_call_done = nfs4_delegreturn_done,
2978         .rpc_release = nfs4_delegreturn_release,
2979 };
2980
2981 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
2982 {
2983         struct nfs4_delegreturndata *data;
2984         struct nfs_server *server = NFS_SERVER(inode);
2985         struct rpc_task *task;
2986         struct rpc_message msg = {
2987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2988                 .rpc_cred = cred,
2989         };
2990         struct rpc_task_setup task_setup_data = {
2991                 .rpc_client = server->client,
2992                 .rpc_message = &msg,
2993                 .callback_ops = &nfs4_delegreturn_ops,
2994                 .flags = RPC_TASK_ASYNC,
2995         };
2996         int status = 0;
2997
2998         data = kmalloc(sizeof(*data), GFP_KERNEL);
2999         if (data == NULL)
3000                 return -ENOMEM;
3001         data->args.fhandle = &data->fh;
3002         data->args.stateid = &data->stateid;
3003         data->args.bitmask = server->attr_bitmask;
3004         nfs_copy_fh(&data->fh, NFS_FH(inode));
3005         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3006         data->res.fattr = &data->fattr;
3007         data->res.server = server;
3008         nfs_fattr_init(data->res.fattr);
3009         data->timestamp = jiffies;
3010         data->rpc_status = 0;
3011
3012         task_setup_data.callback_data = data;
3013         msg.rpc_argp = &data->args,
3014         msg.rpc_resp = &data->res,
3015         task = rpc_run_task(&task_setup_data);
3016         if (IS_ERR(task))
3017                 return PTR_ERR(task);
3018         if (!issync)
3019                 goto out;
3020         status = nfs4_wait_for_completion_rpc_task(task);
3021         if (status != 0)
3022                 goto out;
3023         status = data->rpc_status;
3024         if (status != 0)
3025                 goto out;
3026         nfs_refresh_inode(inode, &data->fattr);
3027 out:
3028         rpc_put_task(task);
3029         return status;
3030 }
3031
3032 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3033 {
3034         struct nfs_server *server = NFS_SERVER(inode);
3035         struct nfs4_exception exception = { };
3036         int err;
3037         do {
3038                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3039                 switch (err) {
3040                         case -NFS4ERR_STALE_STATEID:
3041                         case -NFS4ERR_EXPIRED:
3042                         case 0:
3043                                 return 0;
3044                 }
3045                 err = nfs4_handle_exception(server, err, &exception);
3046         } while (exception.retry);
3047         return err;
3048 }
3049
3050 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3051 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3052
3053 /*
3054  * sleep, with exponential backoff, and retry the LOCK operation.
3055  */
3056 static unsigned long
3057 nfs4_set_lock_task_retry(unsigned long timeout)
3058 {
3059         schedule_timeout_killable(timeout);
3060         timeout <<= 1;
3061         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3062                 return NFS4_LOCK_MAXTIMEOUT;
3063         return timeout;
3064 }
3065
3066 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3067 {
3068         struct inode *inode = state->inode;
3069         struct nfs_server *server = NFS_SERVER(inode);
3070         struct nfs_client *clp = server->nfs_client;
3071         struct nfs_lockt_args arg = {
3072                 .fh = NFS_FH(inode),
3073                 .fl = request,
3074         };
3075         struct nfs_lockt_res res = {
3076                 .denied = request,
3077         };
3078         struct rpc_message msg = {
3079                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3080                 .rpc_argp       = &arg,
3081                 .rpc_resp       = &res,
3082                 .rpc_cred       = state->owner->so_cred,
3083         };
3084         struct nfs4_lock_state *lsp;
3085         int status;
3086
3087         down_read(&clp->cl_sem);
3088         arg.lock_owner.clientid = clp->cl_clientid;
3089         status = nfs4_set_lock_state(state, request);
3090         if (status != 0)
3091                 goto out;
3092         lsp = request->fl_u.nfs4_fl.owner;
3093         arg.lock_owner.id = lsp->ls_id.id;
3094         status = rpc_call_sync(server->client, &msg, 0);
3095         switch (status) {
3096                 case 0:
3097                         request->fl_type = F_UNLCK;
3098                         break;
3099                 case -NFS4ERR_DENIED:
3100                         status = 0;
3101         }
3102         request->fl_ops->fl_release_private(request);
3103 out:
3104         up_read(&clp->cl_sem);
3105         return status;
3106 }
3107
3108 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3109 {
3110         struct nfs4_exception exception = { };
3111         int err;
3112
3113         do {
3114                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3115                                 _nfs4_proc_getlk(state, cmd, request),
3116                                 &exception);
3117         } while (exception.retry);
3118         return err;
3119 }
3120
3121 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3122 {
3123         int res = 0;
3124         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3125                 case FL_POSIX:
3126                         res = posix_lock_file_wait(file, fl);
3127                         break;
3128                 case FL_FLOCK:
3129                         res = flock_lock_file_wait(file, fl);
3130                         break;
3131                 default:
3132                         BUG();
3133         }
3134         return res;
3135 }
3136
3137 struct nfs4_unlockdata {
3138         struct nfs_locku_args arg;
3139         struct nfs_locku_res res;
3140         struct nfs4_lock_state *lsp;
3141         struct nfs_open_context *ctx;
3142         struct file_lock fl;
3143         const struct nfs_server *server;
3144         unsigned long timestamp;
3145 };
3146
3147 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3148                 struct nfs_open_context *ctx,
3149                 struct nfs4_lock_state *lsp,
3150                 struct nfs_seqid *seqid)
3151 {
3152         struct nfs4_unlockdata *p;
3153         struct inode *inode = lsp->ls_state->inode;
3154
3155         p = kmalloc(sizeof(*p), GFP_KERNEL);
3156         if (p == NULL)
3157                 return NULL;
3158         p->arg.fh = NFS_FH(inode);
3159         p->arg.fl = &p->fl;
3160         p->arg.seqid = seqid;
3161         p->arg.stateid = &lsp->ls_stateid;
3162         p->lsp = lsp;
3163         atomic_inc(&lsp->ls_count);
3164         /* Ensure we don't close file until we're done freeing locks! */
3165         p->ctx = get_nfs_open_context(ctx);
3166         memcpy(&p->fl, fl, sizeof(p->fl));
3167         p->server = NFS_SERVER(inode);
3168         return p;
3169 }
3170
3171 static void nfs4_locku_release_calldata(void *data)
3172 {
3173         struct nfs4_unlockdata *calldata = data;
3174         nfs_free_seqid(calldata->arg.seqid);
3175         nfs4_put_lock_state(calldata->lsp);
3176         put_nfs_open_context(calldata->ctx);
3177         kfree(calldata);
3178 }
3179
3180 static void nfs4_locku_done(struct rpc_task *task, void *data)
3181 {
3182         struct nfs4_unlockdata *calldata = data;
3183
3184         if (RPC_ASSASSINATED(task))
3185                 return;
3186         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3187         switch (task->tk_status) {
3188                 case 0:
3189                         memcpy(calldata->lsp->ls_stateid.data,
3190                                         calldata->res.stateid.data,
3191                                         sizeof(calldata->lsp->ls_stateid.data));
3192                         renew_lease(calldata->server, calldata->timestamp);
3193                         break;
3194                 case -NFS4ERR_STALE_STATEID:
3195                 case -NFS4ERR_EXPIRED:
3196                         break;
3197                 default:
3198                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3199                                 rpc_restart_call(task);
3200         }
3201 }
3202
3203 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3204 {
3205         struct nfs4_unlockdata *calldata = data;
3206
3207         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3208                 return;
3209         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3210                 /* Note: exit _without_ running nfs4_locku_done */
3211                 task->tk_action = NULL;
3212                 return;
3213         }
3214         calldata->timestamp = jiffies;
3215         rpc_call_start(task);
3216 }
3217
3218 static const struct rpc_call_ops nfs4_locku_ops = {
3219         .rpc_call_prepare = nfs4_locku_prepare,
3220         .rpc_call_done = nfs4_locku_done,
3221         .rpc_release = nfs4_locku_release_calldata,
3222 };
3223
3224 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3225                 struct nfs_open_context *ctx,
3226                 struct nfs4_lock_state *lsp,
3227                 struct nfs_seqid *seqid)
3228 {
3229         struct nfs4_unlockdata *data;
3230         struct rpc_message msg = {
3231                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3232                 .rpc_cred = ctx->cred,
3233         };
3234         struct rpc_task_setup task_setup_data = {
3235                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3236                 .rpc_message = &msg,
3237                 .callback_ops = &nfs4_locku_ops,
3238                 .flags = RPC_TASK_ASYNC,
3239         };
3240
3241         /* Ensure this is an unlock - when canceling a lock, the
3242          * canceled lock is passed in, and it won't be an unlock.
3243          */
3244         fl->fl_type = F_UNLCK;
3245
3246         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3247         if (data == NULL) {
3248                 nfs_free_seqid(seqid);
3249                 return ERR_PTR(-ENOMEM);
3250         }
3251
3252         msg.rpc_argp = &data->arg,
3253         msg.rpc_resp = &data->res,
3254         task_setup_data.callback_data = data;
3255         return rpc_run_task(&task_setup_data);
3256 }
3257
3258 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3259 {
3260         struct nfs_seqid *seqid;
3261         struct nfs4_lock_state *lsp;
3262         struct rpc_task *task;
3263         int status = 0;
3264
3265         status = nfs4_set_lock_state(state, request);
3266         /* Unlock _before_ we do the RPC call */
3267         request->fl_flags |= FL_EXISTS;
3268         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3269                 goto out;
3270         if (status != 0)
3271                 goto out;
3272         /* Is this a delegated lock? */
3273         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3274                 goto out;
3275         lsp = request->fl_u.nfs4_fl.owner;
3276         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3277         status = -ENOMEM;
3278         if (seqid == NULL)
3279                 goto out;
3280         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3281         status = PTR_ERR(task);
3282         if (IS_ERR(task))
3283                 goto out;
3284         status = nfs4_wait_for_completion_rpc_task(task);
3285         rpc_put_task(task);
3286 out:
3287         return status;
3288 }
3289
3290 struct nfs4_lockdata {
3291         struct nfs_lock_args arg;
3292         struct nfs_lock_res res;
3293         struct nfs4_lock_state *lsp;
3294         struct nfs_open_context *ctx;
3295         struct file_lock fl;
3296         unsigned long timestamp;
3297         int rpc_status;
3298         int cancelled;
3299 };
3300
3301 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3302                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3303 {
3304         struct nfs4_lockdata *p;
3305         struct inode *inode = lsp->ls_state->inode;
3306         struct nfs_server *server = NFS_SERVER(inode);
3307
3308         p = kzalloc(sizeof(*p), GFP_KERNEL);
3309         if (p == NULL)
3310                 return NULL;
3311
3312         p->arg.fh = NFS_FH(inode);
3313         p->arg.fl = &p->fl;
3314         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3315         if (p->arg.open_seqid == NULL)
3316                 goto out_free;
3317         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3318         if (p->arg.lock_seqid == NULL)
3319                 goto out_free_seqid;
3320         p->arg.lock_stateid = &lsp->ls_stateid;
3321         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3322         p->arg.lock_owner.id = lsp->ls_id.id;
3323         p->lsp = lsp;
3324         atomic_inc(&lsp->ls_count);
3325         p->ctx = get_nfs_open_context(ctx);
3326         memcpy(&p->fl, fl, sizeof(p->fl));
3327         return p;
3328 out_free_seqid:
3329         nfs_free_seqid(p->arg.open_seqid);
3330 out_free:
3331         kfree(p);
3332         return NULL;
3333 }
3334
3335 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3336 {
3337         struct nfs4_lockdata *data = calldata;
3338         struct nfs4_state *state = data->lsp->ls_state;
3339
3340         dprintk("%s: begin!\n", __FUNCTION__);
3341         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3342                 return;
3343         /* Do we need to do an open_to_lock_owner? */
3344         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3345                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3346                         return;
3347                 data->arg.open_stateid = &state->stateid;
3348                 data->arg.new_lock_owner = 1;
3349         } else
3350                 data->arg.new_lock_owner = 0;
3351         data->timestamp = jiffies;
3352         rpc_call_start(task);
3353         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3354 }
3355
3356 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3357 {
3358         struct nfs4_lockdata *data = calldata;
3359
3360         dprintk("%s: begin!\n", __FUNCTION__);
3361
3362         data->rpc_status = task->tk_status;
3363         if (RPC_ASSASSINATED(task))
3364                 goto out;
3365         if (data->arg.new_lock_owner != 0) {
3366                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3367                 if (data->rpc_status == 0)
3368                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3369                 else
3370                         goto out;
3371         }
3372         if (data->rpc_status == 0) {
3373                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3374                                         sizeof(data->lsp->ls_stateid.data));
3375                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3376                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3377         }
3378         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3379 out:
3380         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3381 }
3382
3383 static void nfs4_lock_release(void *calldata)
3384 {
3385         struct nfs4_lockdata *data = calldata;
3386
3387         dprintk("%s: begin!\n", __FUNCTION__);
3388         nfs_free_seqid(data->arg.open_seqid);
3389         if (data->cancelled != 0) {
3390                 struct rpc_task *task;
3391                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3392                                 data->arg.lock_seqid);
3393                 if (!IS_ERR(task))
3394                         rpc_put_task(task);
3395                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3396         } else
3397                 nfs_free_seqid(data->arg.lock_seqid);
3398         nfs4_put_lock_state(data->lsp);
3399         put_nfs_open_context(data->ctx);
3400         kfree(data);
3401         dprintk("%s: done!\n", __FUNCTION__);
3402 }
3403
3404 static const struct rpc_call_ops nfs4_lock_ops = {
3405         .rpc_call_prepare = nfs4_lock_prepare,
3406         .rpc_call_done = nfs4_lock_done,
3407         .rpc_release = nfs4_lock_release,
3408 };
3409
3410 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3411 {
3412         struct nfs4_lockdata *data;
3413         struct rpc_task *task;
3414         struct rpc_message msg = {
3415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3416                 .rpc_cred = state->owner->so_cred,
3417         };
3418         struct rpc_task_setup task_setup_data = {
3419                 .rpc_client = NFS_CLIENT(state->inode),
3420                 .rpc_message = &msg,
3421                 .callback_ops = &nfs4_lock_ops,
3422                 .flags = RPC_TASK_ASYNC,
3423         };
3424         int ret;
3425
3426         dprintk("%s: begin!\n", __FUNCTION__);
3427         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3428                         fl->fl_u.nfs4_fl.owner);
3429         if (data == NULL)
3430                 return -ENOMEM;
3431         if (IS_SETLKW(cmd))
3432                 data->arg.block = 1;
3433         if (reclaim != 0)
3434                 data->arg.reclaim = 1;
3435         msg.rpc_argp = &data->arg,
3436         msg.rpc_resp = &data->res,
3437         task_setup_data.callback_data = data;
3438         task = rpc_run_task(&task_setup_data);
3439         if (IS_ERR(task))
3440                 return PTR_ERR(task);
3441         ret = nfs4_wait_for_completion_rpc_task(task);
3442         if (ret == 0) {
3443                 ret = data->rpc_status;
3444                 if (ret == -NFS4ERR_DENIED)
3445                         ret = -EAGAIN;
3446         } else
3447                 data->cancelled = 1;
3448         rpc_put_task(task);
3449         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3450         return ret;
3451 }
3452
3453 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3454 {
3455         struct nfs_server *server = NFS_SERVER(state->inode);
3456         struct nfs4_exception exception = { };
3457         int err;
3458
3459         do {
3460                 /* Cache the lock if possible... */
3461                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3462                         return 0;
3463                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3464                 if (err != -NFS4ERR_DELAY)
3465                         break;
3466                 nfs4_handle_exception(server, err, &exception);
3467         } while (exception.retry);
3468         return err;
3469 }
3470
3471 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3472 {
3473         struct nfs_server *server = NFS_SERVER(state->inode);
3474         struct nfs4_exception exception = { };
3475         int err;
3476
3477         err = nfs4_set_lock_state(state, request);
3478         if (err != 0)
3479                 return err;
3480         do {
3481                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3482                         return 0;
3483                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3484                 if (err != -NFS4ERR_DELAY)
3485                         break;
3486                 nfs4_handle_exception(server, err, &exception);
3487         } while (exception.retry);
3488         return err;
3489 }
3490
3491 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3492 {
3493         struct nfs_client *clp = state->owner->so_client;
3494         unsigned char fl_flags = request->fl_flags;
3495         int status;
3496
3497         /* Is this a delegated open? */
3498         status = nfs4_set_lock_state(state, request);
3499         if (status != 0)
3500                 goto out;
3501         request->fl_flags |= FL_ACCESS;
3502         status = do_vfs_lock(request->fl_file, request);
3503         if (status < 0)
3504                 goto out;
3505         down_read(&clp->cl_sem);
3506         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3507                 struct nfs_inode *nfsi = NFS_I(state->inode);
3508                 /* Yes: cache locks! */
3509                 down_read(&nfsi->rwsem);
3510                 /* ...but avoid races with delegation recall... */
3511                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3512                         request->fl_flags = fl_flags & ~FL_SLEEP;
3513                         status = do_vfs_lock(request->fl_file, request);
3514                         up_read(&nfsi->rwsem);
3515                         goto out_unlock;
3516                 }
3517                 up_read(&nfsi->rwsem);
3518         }
3519         status = _nfs4_do_setlk(state, cmd, request, 0);
3520         if (status != 0)
3521                 goto out_unlock;
3522         /* Note: we always want to sleep here! */
3523         request->fl_flags = fl_flags | FL_SLEEP;
3524         if (do_vfs_lock(request->fl_file, request) < 0)
3525                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3526 out_unlock:
3527         up_read(&clp->cl_sem);
3528 out:
3529         request->fl_flags = fl_flags;
3530         return status;
3531 }
3532
3533 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3534 {
3535         struct nfs4_exception exception = { };
3536         int err;
3537
3538         do {
3539                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3540                                 _nfs4_proc_setlk(state, cmd, request),
3541                                 &exception);
3542         } while (exception.retry);
3543         return err;
3544 }
3545
3546 static int
3547 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3548 {
3549         struct nfs_open_context *ctx;
3550         struct nfs4_state *state;
3551         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3552         int status;
3553
3554         /* verify open state */
3555         ctx = nfs_file_open_context(filp);
3556         state = ctx->state;
3557
3558         if (request->fl_start < 0 || request->fl_end < 0)
3559                 return -EINVAL;
3560
3561         if (IS_GETLK(cmd))
3562                 return nfs4_proc_getlk(state, F_GETLK, request);
3563
3564         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3565                 return -EINVAL;
3566
3567         if (request->fl_type == F_UNLCK)
3568                 return nfs4_proc_unlck(state, cmd, request);
3569
3570         do {
3571                 status = nfs4_proc_setlk(state, cmd, request);
3572                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3573                         break;
3574                 timeout = nfs4_set_lock_task_retry(timeout);
3575                 status = -ERESTARTSYS;
3576                 if (signalled())
3577                         break;
3578         } while(status < 0);
3579         return status;
3580 }
3581
3582 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3583 {
3584         struct nfs_server *server = NFS_SERVER(state->inode);
3585         struct nfs4_exception exception = { };
3586         int err;
3587
3588         err = nfs4_set_lock_state(state, fl);
3589         if (err != 0)
3590                 goto out;
3591         do {
3592                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3593                 if (err != -NFS4ERR_DELAY)
3594                         break;
3595                 err = nfs4_handle_exception(server, err, &exception);
3596         } while (exception.retry);
3597 out:
3598         return err;
3599 }
3600
3601 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3602
3603 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3604                 size_t buflen, int flags)
3605 {
3606         struct inode *inode = dentry->d_inode;
3607
3608         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3609                 return -EOPNOTSUPP;
3610
3611         return nfs4_proc_set_acl(inode, buf, buflen);
3612 }
3613
3614 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3615  * and that's what we'll do for e.g. user attributes that haven't been set.
3616  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3617  * attributes in kernel-managed attribute namespaces. */
3618 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3619                 size_t buflen)
3620 {
3621         struct inode *inode = dentry->d_inode;
3622
3623         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3624                 return -EOPNOTSUPP;
3625
3626         return nfs4_proc_get_acl(inode, buf, buflen);
3627 }
3628
3629 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3630 {
3631         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3632
3633         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3634                 return 0;
3635         if (buf && buflen < len)
3636                 return -ERANGE;
3637         if (buf)
3638                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3639         return len;
3640 }
3641
3642 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3643                 struct nfs4_fs_locations *fs_locations, struct page *page)
3644 {
3645         struct nfs_server *server = NFS_SERVER(dir);
3646         u32 bitmask[2] = {
3647                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3648                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3649         };
3650         struct nfs4_fs_locations_arg args = {
3651                 .dir_fh = NFS_FH(dir),
3652                 .name = name,
3653                 .page = page,
3654                 .bitmask = bitmask,
3655         };
3656         struct rpc_message msg = {
3657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3658                 .rpc_argp = &args,
3659                 .rpc_resp = fs_locations,
3660         };
3661         int status;
3662
3663         dprintk("%s: start\n", __FUNCTION__);
3664         nfs_fattr_init(&fs_locations->fattr);
3665         fs_locations->server = server;
3666         fs_locations->nlocations = 0;
3667         status = rpc_call_sync(server->client, &msg, 0);
3668         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3669         return status;
3670 }
3671
3672 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3673         .recover_open   = nfs4_open_reclaim,
3674         .recover_lock   = nfs4_lock_reclaim,
3675 };
3676
3677 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3678         .recover_open   = nfs4_open_expired,
3679         .recover_lock   = nfs4_lock_expired,
3680 };
3681
3682 static const struct inode_operations nfs4_file_inode_operations = {
3683         .permission     = nfs_permission,
3684         .getattr        = nfs_getattr,
3685         .setattr        = nfs_setattr,
3686         .getxattr       = nfs4_getxattr,
3687         .setxattr       = nfs4_setxattr,
3688         .listxattr      = nfs4_listxattr,
3689 };
3690
3691 const struct nfs_rpc_ops nfs_v4_clientops = {
3692         .version        = 4,                    /* protocol version */
3693         .dentry_ops     = &nfs4_dentry_operations,
3694         .dir_inode_ops  = &nfs4_dir_inode_operations,
3695         .file_inode_ops = &nfs4_file_inode_operations,
3696         .getroot        = nfs4_proc_get_root,
3697         .getattr        = nfs4_proc_getattr,
3698         .setattr        = nfs4_proc_setattr,
3699         .lookupfh       = nfs4_proc_lookupfh,
3700         .lookup         = nfs4_proc_lookup,
3701         .access         = nfs4_proc_access,
3702         .readlink       = nfs4_proc_readlink,
3703         .create         = nfs4_proc_create,
3704         .remove         = nfs4_proc_remove,
3705         .unlink_setup   = nfs4_proc_unlink_setup,
3706         .unlink_done    = nfs4_proc_unlink_done,
3707         .rename         = nfs4_proc_rename,
3708         .link           = nfs4_proc_link,
3709         .symlink        = nfs4_proc_symlink,
3710         .mkdir          = nfs4_proc_mkdir,
3711         .rmdir          = nfs4_proc_remove,
3712         .readdir        = nfs4_proc_readdir,
3713         .mknod          = nfs4_proc_mknod,
3714         .statfs         = nfs4_proc_statfs,
3715         .fsinfo         = nfs4_proc_fsinfo,
3716         .pathconf       = nfs4_proc_pathconf,
3717         .set_capabilities = nfs4_server_capabilities,
3718         .decode_dirent  = nfs4_decode_dirent,
3719         .read_setup     = nfs4_proc_read_setup,
3720         .read_done      = nfs4_read_done,
3721         .write_setup    = nfs4_proc_write_setup,
3722         .write_done     = nfs4_write_done,
3723         .commit_setup   = nfs4_proc_commit_setup,
3724         .commit_done    = nfs4_commit_done,
3725         .file_open      = nfs_open,
3726         .file_release   = nfs_release,
3727         .lock           = nfs4_proc_lock,
3728         .clear_acl_cache = nfs4_zap_acl_attr,
3729 };
3730
3731 /*
3732  * Local variables:
3733  *  c-basic-offset: 8
3734  * End:
3735  */