fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  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_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __FUNCTION__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         u32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 197 {
 198         struct nfs_client *clp = server->nfs_client;
 199         spin_lock(&clp->cl_lock);
 200         if (time_before(clp->cl_last_renewal,timestamp))
 201                 clp->cl_last_renewal = timestamp;
 202         spin_unlock(&clp->cl_lock);
 203 }
 204
 205 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 206 {
 207         struct nfs_inode *nfsi = NFS_I(dir);
 208
 209         spin_lock(&dir->i_lock);
 210         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 211         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 212                 nfsi->change_attr = cinfo->after;
 213         spin_unlock(&dir->i_lock);
 214 }
 215
 216 struct nfs4_opendata {
 217         atomic_t count;
 218         struct nfs_openargs o_arg;
 219         struct nfs_openres o_res;
 220         struct nfs_open_confirmargs c_arg;
 221         struct nfs_open_confirmres c_res;
 222         struct nfs_fattr f_attr;
 223         struct nfs_fattr dir_attr;
 224         struct dentry *dentry;
 225         struct dentry *dir;
 226         struct nfs4_state_owner *owner;
 227         struct iattr attrs;
 228         unsigned long timestamp;
 229         int rpc_status;
 230         int cancelled;
 231 };
 232
 233 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 234                 struct nfs4_state_owner *sp, int flags,
 235                 const struct iattr *attrs)
 236 {
 237         struct dentry *parent = dget_parent(dentry);
 238         struct inode *dir = parent->d_inode;
 239         struct nfs_server *server = NFS_SERVER(dir);
 240         struct nfs4_opendata *p;
 241
 242         p = kzalloc(sizeof(*p), GFP_KERNEL);
 243         if (p == NULL)
 244                 goto err;
 245         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 246         if (p->o_arg.seqid == NULL)
 247                 goto err_free;
 248         atomic_set(&p->count, 1);
 249         p->dentry = dget(dentry);
 250         p->dir = parent;
 251         p->owner = sp;
 252         atomic_inc(&sp->so_count);
 253         p->o_arg.fh = NFS_FH(dir);
 254         p->o_arg.open_flags = flags,
 255         p->o_arg.clientid = server->nfs_client->cl_clientid;
 256         p->o_arg.id = sp->so_id;
 257         p->o_arg.name = &dentry->d_name;
 258         p->o_arg.server = server;
 259         p->o_arg.bitmask = server->attr_bitmask;
 260         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 261         p->o_res.f_attr = &p->f_attr;
 262         p->o_res.dir_attr = &p->dir_attr;
 263         p->o_res.server = server;
 264         nfs_fattr_init(&p->f_attr);
 265         nfs_fattr_init(&p->dir_attr);
 266         if (flags & O_EXCL) {
 267                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 268                 s[0] = jiffies;
 269                 s[1] = current->pid;
 270         } else if (flags & O_CREAT) {
 271                 p->o_arg.u.attrs = &p->attrs;
 272                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 273         }
 274         p->c_arg.fh = &p->o_res.fh;
 275         p->c_arg.stateid = &p->o_res.stateid;
 276         p->c_arg.seqid = p->o_arg.seqid;
 277         return p;
 278 err_free:
 279         kfree(p);
 280 err:
 281         dput(parent);
 282         return NULL;
 283 }
 284
 285 static void nfs4_opendata_free(struct nfs4_opendata *p)
 286 {
 287         if (p != NULL && atomic_dec_and_test(&p->count)) {
 288                 nfs_free_seqid(p->o_arg.seqid);
 289                 nfs4_put_state_owner(p->owner);
 290                 dput(p->dir);
 291                 dput(p->dentry);
 292                 kfree(p);
 293         }
 294 }
 295
 296 /* Helper for asynchronous RPC calls */
 297 static int nfs4_call_async(struct rpc_clnt *clnt,
 298                 const struct rpc_call_ops *tk_ops, void *calldata)
 299 {
 300         struct rpc_task *task;
 301
 302         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 303                 return -ENOMEM;
 304         rpc_execute(task);
 305         return 0;
 306 }
 307
 308 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 309 {
 310         sigset_t oldset;
 311         int ret;
 312
 313         rpc_clnt_sigmask(task->tk_client, &oldset);
 314         ret = rpc_wait_for_completion_task(task);
 315         rpc_clnt_sigunmask(task->tk_client, &oldset);
 316         return ret;
 317 }
 318
 319 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 320 {
 321         switch (open_flags) {
 322                 case FMODE_WRITE:
 323                         state->n_wronly++;
 324                         break;
 325                 case FMODE_READ:
 326                         state->n_rdonly++;
 327                         break;
 328                 case FMODE_READ|FMODE_WRITE:
 329                         state->n_rdwr++;
 330         }
 331 }
 332
 333 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 334 {
 335         struct inode *inode = state->inode;
 336
 337         open_flags &= (FMODE_READ|FMODE_WRITE);
 338         /* Protect against nfs4_find_state_byowner() */
 339         spin_lock(&state->owner->so_lock);
 340         spin_lock(&inode->i_lock);
 341         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 342         update_open_stateflags(state, open_flags);
 343         nfs4_state_set_mode_locked(state, state->state | open_flags);
 344         spin_unlock(&inode->i_lock);
 345         spin_unlock(&state->owner->so_lock);
 346 }
 347
 348 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 349 {
 350         struct inode *inode;
 351         struct nfs4_state *state = NULL;
 352
 353         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 354                 goto out;
 355         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 356         if (IS_ERR(inode))
 357                 goto out;
 358         state = nfs4_get_open_state(inode, data->owner);
 359         if (state == NULL)
 360                 goto put_inode;
 361         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 362 put_inode:
 363         iput(inode);
 364 out:
 365         return state;
 366 }
 367
 368 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 369 {
 370         struct nfs_inode *nfsi = NFS_I(state->inode);
 371         struct nfs_open_context *ctx;
 372
 373         spin_lock(&state->inode->i_lock);
 374         list_for_each_entry(ctx, &nfsi->open_files, list) {
 375                 if (ctx->state != state)
 376                         continue;
 377                 get_nfs_open_context(ctx);
 378                 spin_unlock(&state->inode->i_lock);
 379                 return ctx;
 380         }
 381         spin_unlock(&state->inode->i_lock);
 382         return ERR_PTR(-ENOENT);
 383 }
 384
 385 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 386 {
 387         int ret;
 388
 389         opendata->o_arg.open_flags = openflags;
 390         ret = _nfs4_proc_open(opendata);
 391         if (ret != 0)
 392                 return ret;
 393         memcpy(stateid->data, opendata->o_res.stateid.data,
 394                         sizeof(stateid->data));
 395         return 0;
 396 }
 397
 398 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 399 {
 400         nfs4_stateid stateid;
 401         struct nfs4_state *newstate;
 402         int mode = 0;
 403         int delegation = 0;
 404         int ret;
 405
 406         /* memory barrier prior to reading state->n_* */
 407         smp_rmb();
 408         if (state->n_rdwr != 0) {
 409                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 410                 if (ret != 0)
 411                         return ret;
 412                 mode |= FMODE_READ|FMODE_WRITE;
 413                 if (opendata->o_res.delegation_type != 0)
 414                         delegation = opendata->o_res.delegation_type;
 415                 smp_rmb();
 416         }
 417         if (state->n_wronly != 0) {
 418                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 419                 if (ret != 0)
 420                         return ret;
 421                 mode |= FMODE_WRITE;
 422                 if (opendata->o_res.delegation_type != 0)
 423                         delegation = opendata->o_res.delegation_type;
 424                 smp_rmb();
 425         }
 426         if (state->n_rdonly != 0) {
 427                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 428                 if (ret != 0)
 429                         return ret;
 430                 mode |= FMODE_READ;
 431         }
 432         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 433         if (mode == 0)
 434                 return 0;
 435         if (opendata->o_res.delegation_type == 0)
 436                 opendata->o_res.delegation_type = delegation;
 437         opendata->o_arg.open_flags |= mode;
 438         newstate = nfs4_opendata_to_nfs4_state(opendata);
 439         if (newstate != NULL) {
 440                 if (opendata->o_res.delegation_type != 0) {
 441                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 442                         int delegation_flags = 0;
 443                         if (nfsi->delegation)
 444                                 delegation_flags = nfsi->delegation->flags;
 445                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 446                                 nfs_inode_set_delegation(newstate->inode,
 447                                                 opendata->owner->so_cred,
 448                                                 &opendata->o_res);
 449                         else
 450                                 nfs_inode_reclaim_delegation(newstate->inode,
 451                                                 opendata->owner->so_cred,
 452                                                 &opendata->o_res);
 453                 }
 454                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
 455         }
 456         if (newstate != state)
 457                 return -ESTALE;
 458         return 0;
 459 }
 460
 461 /*
 462  * OPEN_RECLAIM:
 463  *      reclaim state on the server after a reboot.
 464  */
 465 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 466 {
 467         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 468         struct nfs4_opendata *opendata;
 469         int delegation_type = 0;
 470         int status;
 471
 472         if (delegation != NULL) {
 473                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 474                         memcpy(&state->stateid, &delegation->stateid,
 475                                         sizeof(state->stateid));
 476                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 477                         return 0;
 478                 }
 479                 delegation_type = delegation->type;
 480         }
 481         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 482         if (opendata == NULL)
 483                 return -ENOMEM;
 484         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 485         opendata->o_arg.fh = NFS_FH(state->inode);
 486         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 487         opendata->o_arg.u.delegation_type = delegation_type;
 488         status = nfs4_open_recover(opendata, state);
 489         nfs4_opendata_free(opendata);
 490         return status;
 491 }
 492
 493 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 494 {
 495         struct nfs_server *server = NFS_SERVER(state->inode);
 496         struct nfs4_exception exception = { };
 497         int err;
 498         do {
 499                 err = _nfs4_do_open_reclaim(sp, state, dentry);
 500                 if (err != -NFS4ERR_DELAY)
 501                         break;
 502                 nfs4_handle_exception(server, err, &exception);
 503         } while (exception.retry);
 504         return err;
 505 }
 506
 507 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 508 {
 509         struct nfs_open_context *ctx;
 510         int ret;
 511
 512         ctx = nfs4_state_find_open_context(state);
 513         if (IS_ERR(ctx))
 514                 return PTR_ERR(ctx);
 515         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
 516         put_nfs_open_context(ctx);
 517         return ret;
 518 }
 519
 520 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 521 {
 522         struct nfs4_state_owner  *sp  = state->owner;
 523         struct nfs4_opendata *opendata;
 524         int ret;
 525
 526         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 527                 return 0;
 528         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 529         if (opendata == NULL)
 530                 return -ENOMEM;
 531         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 532         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 533                         sizeof(opendata->o_arg.u.delegation.data));
 534         ret = nfs4_open_recover(opendata, state);
 535         nfs4_opendata_free(opendata);
 536         return ret;
 537 }
 538
 539 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 540 {
 541         struct nfs4_exception exception = { };
 542         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 543         int err;
 544         do {
 545                 err = _nfs4_open_delegation_recall(dentry, state);
 546                 switch (err) {
 547                         case 0:
 548                                 return err;
 549                         case -NFS4ERR_STALE_CLIENTID:
 550                         case -NFS4ERR_STALE_STATEID:
 551                         case -NFS4ERR_EXPIRED:
 552                                 /* Don't recall a delegation if it was lost */
 553                                 nfs4_schedule_state_recovery(server->nfs_client);
 554                                 return err;
 555                 }
 556                 err = nfs4_handle_exception(server, err, &exception);
 557         } while (exception.retry);
 558         return err;
 559 }
 560
 561 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 562 {
 563         struct nfs4_opendata *data = calldata;
 564         struct  rpc_message msg = {
 565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 566                 .rpc_argp = &data->c_arg,
 567                 .rpc_resp = &data->c_res,
 568                 .rpc_cred = data->owner->so_cred,
 569         };
 570         data->timestamp = jiffies;
 571         rpc_call_setup(task, &msg, 0);
 572 }
 573
 574 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 575 {
 576         struct nfs4_opendata *data = calldata;
 577
 578         data->rpc_status = task->tk_status;
 579         if (RPC_ASSASSINATED(task))
 580                 return;
 581         if (data->rpc_status == 0) {
 582                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 583                                 sizeof(data->o_res.stateid.data));
 584                 renew_lease(data->o_res.server, data->timestamp);
 585         }
 586         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 587         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 588 }
 589
 590 static void nfs4_open_confirm_release(void *calldata)
 591 {
 592         struct nfs4_opendata *data = calldata;
 593         struct nfs4_state *state = NULL;
 594
 595         /* If this request hasn't been cancelled, do nothing */
 596         if (data->cancelled == 0)
 597                 goto out_free;
 598         /* In case of error, no cleanup! */
 599         if (data->rpc_status != 0)
 600                 goto out_free;
 601         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 602         state = nfs4_opendata_to_nfs4_state(data);
 603         if (state != NULL)
 604                 nfs4_close_state(state, data->o_arg.open_flags);
 605 out_free:
 606         nfs4_opendata_free(data);
 607 }
 608
 609 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 610         .rpc_call_prepare = nfs4_open_confirm_prepare,
 611         .rpc_call_done = nfs4_open_confirm_done,
 612         .rpc_release = nfs4_open_confirm_release,
 613 };
 614
 615 /*
 616  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 617  */
 618 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 619 {
 620         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 621         struct rpc_task *task;
 622         int status;
 623
 624         atomic_inc(&data->count);
 625         /*
 626          * If rpc_run_task() ends up calling ->rpc_release(), we
 627          * want to ensure that it takes the 'error' code path.
 628          */
 629         data->rpc_status = -ENOMEM;
 630         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 631         if (IS_ERR(task))
 632                 return PTR_ERR(task);
 633         status = nfs4_wait_for_completion_rpc_task(task);
 634         if (status != 0) {
 635                 data->cancelled = 1;
 636                 smp_wmb();
 637         } else
 638                 status = data->rpc_status;
 639         rpc_release_task(task);
 640         return status;
 641 }
 642
 643 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 644 {
 645         struct nfs4_opendata *data = calldata;
 646         struct nfs4_state_owner *sp = data->owner;
 647         struct rpc_message msg = {
 648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 649                 .rpc_argp = &data->o_arg,
 650                 .rpc_resp = &data->o_res,
 651                 .rpc_cred = sp->so_cred,
 652         };
 653
 654         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 655                 return;
 656         /* Update sequence id. */
 657         data->o_arg.id = sp->so_id;
 658         data->o_arg.clientid = sp->so_client->cl_clientid;
 659         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 660                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 661         data->timestamp = jiffies;
 662         rpc_call_setup(task, &msg, 0);
 663 }
 664
 665 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 666 {
 667         struct nfs4_opendata *data = calldata;
 668
 669         data->rpc_status = task->tk_status;
 670         if (RPC_ASSASSINATED(task))
 671                 return;
 672         if (task->tk_status == 0) {
 673                 switch (data->o_res.f_attr->mode & S_IFMT) {
 674                         case S_IFREG:
 675                                 break;
 676                         case S_IFLNK:
 677                                 data->rpc_status = -ELOOP;
 678                                 break;
 679                         case S_IFDIR:
 680                                 data->rpc_status = -EISDIR;
 681                                 break;
 682                         default:
 683                                 data->rpc_status = -ENOTDIR;
 684                 }
 685                 renew_lease(data->o_res.server, data->timestamp);
 686         }
 687         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 688 }
 689
 690 static void nfs4_open_release(void *calldata)
 691 {
 692         struct nfs4_opendata *data = calldata;
 693         struct nfs4_state *state = NULL;
 694
 695         /* If this request hasn't been cancelled, do nothing */
 696         if (data->cancelled == 0)
 697                 goto out_free;
 698         /* In case of error, no cleanup! */
 699         if (data->rpc_status != 0)
 700                 goto out_free;
 701         /* In case we need an open_confirm, no cleanup! */
 702         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 703                 goto out_free;
 704         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 705         state = nfs4_opendata_to_nfs4_state(data);
 706         if (state != NULL)
 707                 nfs4_close_state(state, data->o_arg.open_flags);
 708 out_free:
 709         nfs4_opendata_free(data);
 710 }
 711
 712 static const struct rpc_call_ops nfs4_open_ops = {
 713         .rpc_call_prepare = nfs4_open_prepare,
 714         .rpc_call_done = nfs4_open_done,
 715         .rpc_release = nfs4_open_release,
 716 };
 717
 718 /*
 719  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 720  */
 721 static int _nfs4_proc_open(struct nfs4_opendata *data)
 722 {
 723         struct inode *dir = data->dir->d_inode;
 724         struct nfs_server *server = NFS_SERVER(dir);
 725         struct nfs_openargs *o_arg = &data->o_arg;
 726         struct nfs_openres *o_res = &data->o_res;
 727         struct rpc_task *task;
 728         int status;
 729
 730         atomic_inc(&data->count);
 731         /*
 732          * If rpc_run_task() ends up calling ->rpc_release(), we
 733          * want to ensure that it takes the 'error' code path.
 734          */
 735         data->rpc_status = -ENOMEM;
 736         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 737         if (IS_ERR(task))
 738                 return PTR_ERR(task);
 739         status = nfs4_wait_for_completion_rpc_task(task);
 740         if (status != 0) {
 741                 data->cancelled = 1;
 742                 smp_wmb();
 743         } else
 744                 status = data->rpc_status;
 745         rpc_release_task(task);
 746         if (status != 0)
 747                 return status;
 748
 749         if (o_arg->open_flags & O_CREAT) {
 750                 update_changeattr(dir, &o_res->cinfo);
 751                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 752         } else
 753                 nfs_refresh_inode(dir, o_res->dir_attr);
 754         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 755                 status = _nfs4_proc_open_confirm(data);
 756                 if (status != 0)
 757                         return status;
 758         }
 759         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 760         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 761                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 762         return 0;
 763 }
 764
 765 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 766 {
 767         struct nfs_access_entry cache;
 768         int mask = 0;
 769         int status;
 770
 771         if (openflags & FMODE_READ)
 772                 mask |= MAY_READ;
 773         if (openflags & FMODE_WRITE)
 774                 mask |= MAY_WRITE;
 775         status = nfs_access_get_cached(inode, cred, &cache);
 776         if (status == 0)
 777                 goto out;
 778
 779         /* Be clever: ask server to check for all possible rights */
 780         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 781         cache.cred = cred;
 782         cache.jiffies = jiffies;
 783         status = _nfs4_proc_access(inode, &cache);
 784         if (status != 0)
 785                 return status;
 786         nfs_access_add_cache(inode, &cache);
 787 out:
 788         if ((cache.mask & mask) == mask)
 789                 return 0;
 790         return -EACCES;
 791 }
 792
 793 int nfs4_recover_expired_lease(struct nfs_server *server)
 794 {
 795         struct nfs_client *clp = server->nfs_client;
 796
 797         if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 798                 nfs4_schedule_state_recovery(clp);
 799         return nfs4_wait_clnt_recover(server->client, clp);
 800 }
 801
 802 /*
 803  * OPEN_EXPIRED:
 804  *      reclaim state on the server after a network partition.
 805  *      Assumes caller holds the appropriate lock
 806  */
 807 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 808 {
 809         struct inode *inode = state->inode;
 810         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 811         struct nfs4_opendata *opendata;
 812         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 813         int ret;
 814
 815         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 816                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 817                 if (ret < 0)
 818                         return ret;
 819                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 820                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 821                 return 0;
 822         }
 823         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 824         if (opendata == NULL)
 825                 return -ENOMEM;
 826         ret = nfs4_open_recover(opendata, state);
 827         if (ret == -ESTALE) {
 828                 /* Invalidate the state owner so we don't ever use it again */
 829                 nfs4_drop_state_owner(sp);
 830                 d_drop(dentry);
 831         }
 832         nfs4_opendata_free(opendata);
 833         return ret;
 834 }
 835
 836 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 837 {
 838         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 839         struct nfs4_exception exception = { };
 840         int err;
 841
 842         do {
 843                 err = _nfs4_open_expired(sp, state, dentry);
 844                 if (err == -NFS4ERR_DELAY)
 845                         nfs4_handle_exception(server, err, &exception);
 846         } while (exception.retry);
 847         return err;
 848 }
 849
 850 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 851 {
 852         struct nfs_open_context *ctx;
 853         int ret;
 854
 855         ctx = nfs4_state_find_open_context(state);
 856         if (IS_ERR(ctx))
 857                 return PTR_ERR(ctx);
 858         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 859         put_nfs_open_context(ctx);
 860         return ret;
 861 }
 862
 863 /*
 864  * Returns a referenced nfs4_state if there is an open delegation on the file
 865  */
 866 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 867 {
 868         struct nfs_delegation *delegation;
 869         struct nfs_server *server = NFS_SERVER(inode);
 870         struct nfs_client *clp = server->nfs_client;
 871         struct nfs_inode *nfsi = NFS_I(inode);
 872         struct nfs4_state_owner *sp = NULL;
 873         struct nfs4_state *state = NULL;
 874         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 875         int err;
 876
 877         err = -ENOMEM;
 878         if (!(sp = nfs4_get_state_owner(server, cred))) {
 879                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 880                 return err;
 881         }
 882         err = nfs4_recover_expired_lease(server);
 883         if (err != 0)
 884                 goto out_put_state_owner;
 885         /* Protect against reboot recovery - NOTE ORDER! */
 886         down_read(&clp->cl_sem);
 887         /* Protect against delegation recall */
 888         down_read(&nfsi->rwsem);
 889         delegation = NFS_I(inode)->delegation;
 890         err = -ENOENT;
 891         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 892                 goto out_err;
 893         err = -ENOMEM;
 894         state = nfs4_get_open_state(inode, sp);
 895         if (state == NULL)
 896                 goto out_err;
 897
 898         err = -ENOENT;
 899         if ((state->state & open_flags) == open_flags) {
 900                 spin_lock(&inode->i_lock);
 901                 update_open_stateflags(state, open_flags);
 902                 spin_unlock(&inode->i_lock);
 903                 goto out_ok;
 904         } else if (state->state != 0)
 905                 goto out_put_open_state;
 906
 907         lock_kernel();
 908         err = _nfs4_do_access(inode, cred, open_flags);
 909         unlock_kernel();
 910         if (err != 0)
 911                 goto out_put_open_state;
 912         set_bit(NFS_DELEGATED_STATE, &state->flags);
 913         update_open_stateid(state, &delegation->stateid, open_flags);
 914 out_ok:
 915         nfs4_put_state_owner(sp);
 916         up_read(&nfsi->rwsem);
 917         up_read(&clp->cl_sem);
 918         *res = state;
 919         return 0;
 920 out_put_open_state:
 921         nfs4_put_open_state(state);
 922 out_err:
 923         up_read(&nfsi->rwsem);
 924         up_read(&clp->cl_sem);
 925         if (err != -EACCES)
 926                 nfs_inode_return_delegation(inode);
 927 out_put_state_owner:
 928         nfs4_put_state_owner(sp);
 929         return err;
 930 }
 931
 932 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 933 {
 934         struct nfs4_exception exception = { };
 935         struct nfs4_state *res = ERR_PTR(-EIO);
 936         int err;
 937
 938         do {
 939                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 940                 if (err == 0)
 941                         break;
 942                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 943                                         err, &exception));
 944         } while (exception.retry);
 945         return res;
 946 }
 947
 948 /*
 949  * Returns a referenced nfs4_state
 950  */
 951 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 952 {
 953         struct nfs4_state_owner  *sp;
 954         struct nfs4_state     *state = NULL;
 955         struct nfs_server       *server = NFS_SERVER(dir);
 956         struct nfs_client *clp = server->nfs_client;
 957         struct nfs4_opendata *opendata;
 958         int                     status;
 959
 960         /* Protect against reboot recovery conflicts */
 961         status = -ENOMEM;
 962         if (!(sp = nfs4_get_state_owner(server, cred))) {
 963                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 964                 goto out_err;
 965         }
 966         status = nfs4_recover_expired_lease(server);
 967         if (status != 0)
 968                 goto err_put_state_owner;
 969         down_read(&clp->cl_sem);
 970         status = -ENOMEM;
 971         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 972         if (opendata == NULL)
 973                 goto err_release_rwsem;
 974
 975         status = _nfs4_proc_open(opendata);
 976         if (status != 0)
 977                 goto err_opendata_free;
 978
 979         status = -ENOMEM;
 980         state = nfs4_opendata_to_nfs4_state(opendata);
 981         if (state == NULL)
 982                 goto err_opendata_free;
 983         if (opendata->o_res.delegation_type != 0)
 984                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 985         nfs4_opendata_free(opendata);
 986         nfs4_put_state_owner(sp);
 987         up_read(&clp->cl_sem);
 988         *res = state;
 989         return 0;
 990 err_opendata_free:
 991         nfs4_opendata_free(opendata);
 992 err_release_rwsem:
 993         up_read(&clp->cl_sem);
 994 err_put_state_owner:
 995         nfs4_put_state_owner(sp);
 996 out_err:
 997         *res = NULL;
 998         return status;
 999 }
1000
1001
1002 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1003 {
1004         struct nfs4_exception exception = { };
1005         struct nfs4_state *res;
1006         int status;
1007
1008         do {
1009                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1010                 if (status == 0)
1011                         break;
1012                 /* NOTE: BAD_SEQID means the server and client disagree about the
1013                  * book-keeping w.r.t. state-changing operations
1014                  * (OPEN/CLOSE/LOCK/LOCKU...)
1015                  * It is actually a sign of a bug on the client or on the server.
1016                  *
1017                  * If we receive a BAD_SEQID error in the particular case of
1018                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1019                  * have unhashed the old state_owner for us, and that we can
1020                  * therefore safely retry using a new one. We should still warn
1021                  * the user though...
1022                  */
1023                 if (status == -NFS4ERR_BAD_SEQID) {
1024                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1025                         exception.retry = 1;
1026                         continue;
1027                 }
1028                 /*
1029                  * BAD_STATEID on OPEN means that the server cancelled our
1030                  * state before it received the OPEN_CONFIRM.
1031                  * Recover by retrying the request as per the discussion
1032                  * on Page 181 of RFC3530.
1033                  */
1034                 if (status == -NFS4ERR_BAD_STATEID) {
1035                         exception.retry = 1;
1036                         continue;
1037                 }
1038                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1039                                         status, &exception));
1040         } while (exception.retry);
1041         return res;
1042 }
1043
1044 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1045                 struct iattr *sattr, struct nfs4_state *state)
1046 {
1047         struct nfs_server *server = NFS_SERVER(inode);
1048         struct nfs_setattrargs  arg = {
1049                 .fh             = NFS_FH(inode),
1050                 .iap            = sattr,
1051                 .server         = server,
1052                 .bitmask = server->attr_bitmask,
1053         };
1054         struct nfs_setattrres  res = {
1055                 .fattr          = fattr,
1056                 .server         = server,
1057         };
1058         struct rpc_message msg = {
1059                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1060                 .rpc_argp       = &arg,
1061                 .rpc_resp       = &res,
1062         };
1063         unsigned long timestamp = jiffies;
1064         int status;
1065
1066         nfs_fattr_init(fattr);
1067
1068         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1069                 /* Use that stateid */
1070         } else if (state != NULL) {
1071                 msg.rpc_cred = state->owner->so_cred;
1072                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1073         } else
1074                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1075
1076         status = rpc_call_sync(server->client, &msg, 0);
1077         if (status == 0 && state != NULL)
1078                 renew_lease(server, timestamp);
1079         return status;
1080 }
1081
1082 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1083                 struct iattr *sattr, struct nfs4_state *state)
1084 {
1085         struct nfs_server *server = NFS_SERVER(inode);
1086         struct nfs4_exception exception = { };
1087         int err;
1088         do {
1089                 err = nfs4_handle_exception(server,
1090                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1091                                 &exception);
1092         } while (exception.retry);
1093         return err;
1094 }
1095
1096 struct nfs4_closedata {
1097         struct inode *inode;
1098         struct nfs4_state *state;
1099         struct nfs_closeargs arg;
1100         struct nfs_closeres res;
1101         struct nfs_fattr fattr;
1102         unsigned long timestamp;
1103 };
1104
1105 static void nfs4_free_closedata(void *data)
1106 {
1107         struct nfs4_closedata *calldata = data;
1108         struct nfs4_state_owner *sp = calldata->state->owner;
1109
1110         nfs4_put_open_state(calldata->state);
1111         nfs_free_seqid(calldata->arg.seqid);
1112         nfs4_put_state_owner(sp);
1113         kfree(calldata);
1114 }
1115
1116 static void nfs4_close_done(struct rpc_task *task, void *data)
1117 {
1118         struct nfs4_closedata *calldata = data;
1119         struct nfs4_state *state = calldata->state;
1120         struct nfs_server *server = NFS_SERVER(calldata->inode);
1121
1122         if (RPC_ASSASSINATED(task))
1123                 return;
1124         /* hmm. we are done with the inode, and in the process of freeing
1125          * the state_owner. we keep this around to process errors
1126          */
1127         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1128         switch (task->tk_status) {
1129                 case 0:
1130                         memcpy(&state->stateid, &calldata->res.stateid,
1131                                         sizeof(state->stateid));
1132                         renew_lease(server, calldata->timestamp);
1133                         break;
1134                 case -NFS4ERR_STALE_STATEID:
1135                 case -NFS4ERR_EXPIRED:
1136                         nfs4_schedule_state_recovery(server->nfs_client);
1137                         break;
1138                 default:
1139                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1140                                 rpc_restart_call(task);
1141                                 return;
1142                         }
1143         }
1144         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1145 }
1146
1147 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1148 {
1149         struct nfs4_closedata *calldata = data;
1150         struct nfs4_state *state = calldata->state;
1151         struct rpc_message msg = {
1152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1153                 .rpc_argp = &calldata->arg,
1154                 .rpc_resp = &calldata->res,
1155                 .rpc_cred = state->owner->so_cred,
1156         };
1157         int mode = 0, old_mode;
1158
1159         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1160                 return;
1161         /* Recalculate the new open mode in case someone reopened the file
1162          * while we were waiting in line to be scheduled.
1163          */
1164         spin_lock(&state->owner->so_lock);
1165         spin_lock(&calldata->inode->i_lock);
1166         mode = old_mode = state->state;
1167         if (state->n_rdwr == 0) {
1168                 if (state->n_rdonly == 0)
1169                         mode &= ~FMODE_READ;
1170                 if (state->n_wronly == 0)
1171                         mode &= ~FMODE_WRITE;
1172         }
1173         nfs4_state_set_mode_locked(state, mode);
1174         spin_unlock(&calldata->inode->i_lock);
1175         spin_unlock(&state->owner->so_lock);
1176         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1177                 /* Note: exit _without_ calling nfs4_close_done */
1178                 task->tk_action = NULL;
1179                 return;
1180         }
1181         nfs_fattr_init(calldata->res.fattr);
1182         if (mode != 0)
1183                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1184         calldata->arg.open_flags = mode;
1185         calldata->timestamp = jiffies;
1186         rpc_call_setup(task, &msg, 0);
1187 }
1188
1189 static const struct rpc_call_ops nfs4_close_ops = {
1190         .rpc_call_prepare = nfs4_close_prepare,
1191         .rpc_call_done = nfs4_close_done,
1192         .rpc_release = nfs4_free_closedata,
1193 };
1194
1195 /*
1196  * It is possible for data to be read/written from a mem-mapped file
1197  * after the sys_close call (which hits the vfs layer as a flush).
1198  * This means that we can't safely call nfsv4 close on a file until
1199  * the inode is cleared. This in turn means that we are not good
1200  * NFSv4 citizens - we do not indicate to the server to update the file's
1201  * share state even when we are done with one of the three share
1202  * stateid's in the inode.
1203  *
1204  * NOTE: Caller must be holding the sp->so_owner semaphore!
1205  */
1206 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1207 {
1208         struct nfs_server *server = NFS_SERVER(inode);
1209         struct nfs4_closedata *calldata;
1210         int status = -ENOMEM;
1211
1212         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1213         if (calldata == NULL)
1214                 goto out;
1215         calldata->inode = inode;
1216         calldata->state = state;
1217         calldata->arg.fh = NFS_FH(inode);
1218         calldata->arg.stateid = &state->stateid;
1219         /* Serialization for the sequence id */
1220         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1221         if (calldata->arg.seqid == NULL)
1222                 goto out_free_calldata;
1223         calldata->arg.bitmask = server->attr_bitmask;
1224         calldata->res.fattr = &calldata->fattr;
1225         calldata->res.server = server;
1226
1227         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1228         if (status == 0)
1229                 goto out;
1230
1231         nfs_free_seqid(calldata->arg.seqid);
1232 out_free_calldata:
1233         kfree(calldata);
1234 out:
1235         return status;
1236 }
1237
1238 static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1239 {
1240         struct file *filp;
1241
1242         filp = lookup_instantiate_filp(nd, dentry, NULL);
1243         if (!IS_ERR(filp)) {
1244                 struct nfs_open_context *ctx;
1245                 ctx = (struct nfs_open_context *)filp->private_data;
1246                 ctx->state = state;
1247                 return 0;
1248         }
1249         nfs4_close_state(state, nd->intent.open.flags);
1250         return PTR_ERR(filp);
1251 }
1252
1253 struct dentry *
1254 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1255 {
1256         struct iattr attr;
1257         struct rpc_cred *cred;
1258         struct nfs4_state *state;
1259         struct dentry *res;
1260
1261         if (nd->flags & LOOKUP_CREATE) {
1262                 attr.ia_mode = nd->intent.open.create_mode;
1263                 attr.ia_valid = ATTR_MODE;
1264                 if (!IS_POSIXACL(dir))
1265                         attr.ia_mode &= ~current->fs->umask;
1266         } else {
1267                 attr.ia_valid = 0;
1268                 BUG_ON(nd->intent.open.flags & O_CREAT);
1269         }
1270
1271         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1272         if (IS_ERR(cred))
1273                 return (struct dentry *)cred;
1274         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1275         put_rpccred(cred);
1276         if (IS_ERR(state)) {
1277                 if (PTR_ERR(state) == -ENOENT)
1278                         d_add(dentry, NULL);
1279                 return (struct dentry *)state;
1280         }
1281         res = d_add_unique(dentry, igrab(state->inode));
1282         if (res != NULL)
1283                 dentry = res;
1284         nfs4_intent_set_file(nd, dentry, state);
1285         return res;
1286 }
1287
1288 int
1289 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1290 {
1291         struct rpc_cred *cred;
1292         struct nfs4_state *state;
1293
1294         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1295         if (IS_ERR(cred))
1296                 return PTR_ERR(cred);
1297         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1298         if (IS_ERR(state))
1299                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1300         put_rpccred(cred);
1301         if (IS_ERR(state)) {
1302                 switch (PTR_ERR(state)) {
1303                         case -EPERM:
1304                         case -EACCES:
1305                         case -EDQUOT:
1306                         case -ENOSPC:
1307                         case -EROFS:
1308                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1309                                 return 1;
1310                         case -ENOENT:
1311                                 if (dentry->d_inode == NULL)
1312                                         return 1;
1313                 }
1314                 goto out_drop;
1315         }
1316         if (state->inode == dentry->d_inode) {
1317                 nfs4_intent_set_file(nd, dentry, state);
1318                 return 1;
1319         }
1320         nfs4_close_state(state, openflags);
1321 out_drop:
1322         d_drop(dentry);
1323         return 0;
1324 }
1325
1326
1327 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1328 {
1329         struct nfs4_server_caps_res res = {};
1330         struct rpc_message msg = {
1331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1332                 .rpc_argp = fhandle,
1333                 .rpc_resp = &res,
1334         };
1335         int status;
1336
1337         status = rpc_call_sync(server->client, &msg, 0);
1338         if (status == 0) {
1339                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1340                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1341                         server->caps |= NFS_CAP_ACLS;
1342                 if (res.has_links != 0)
1343                         server->caps |= NFS_CAP_HARDLINKS;
1344                 if (res.has_symlinks != 0)
1345                         server->caps |= NFS_CAP_SYMLINKS;
1346                 server->acl_bitmask = res.acl_bitmask;
1347         }
1348         return status;
1349 }
1350
1351 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1352 {
1353         struct nfs4_exception exception = { };
1354         int err;
1355         do {
1356                 err = nfs4_handle_exception(server,
1357                                 _nfs4_server_capabilities(server, fhandle),
1358                                 &exception);
1359         } while (exception.retry);
1360         return err;
1361 }
1362
1363 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1364                 struct nfs_fsinfo *info)
1365 {
1366         struct nfs4_lookup_root_arg args = {
1367                 .bitmask = nfs4_fattr_bitmap,
1368         };
1369         struct nfs4_lookup_res res = {
1370                 .server = server,
1371                 .fattr = info->fattr,
1372                 .fh = fhandle,
1373         };
1374         struct rpc_message msg = {
1375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1376                 .rpc_argp = &args,
1377                 .rpc_resp = &res,
1378         };
1379         nfs_fattr_init(info->fattr);
1380         return rpc_call_sync(server->client, &msg, 0);
1381 }
1382
1383 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1384                 struct nfs_fsinfo *info)
1385 {
1386         struct nfs4_exception exception = { };
1387         int err;
1388         do {
1389                 err = nfs4_handle_exception(server,
1390                                 _nfs4_lookup_root(server, fhandle, info),
1391                                 &exception);
1392         } while (exception.retry);
1393         return err;
1394 }
1395
1396 /*
1397  * get the file handle for the "/" directory on the server
1398  */
1399 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1400                               struct nfs_fsinfo *info)
1401 {
1402         int status;
1403
1404         status = nfs4_lookup_root(server, fhandle, info);
1405         if (status == 0)
1406                 status = nfs4_server_capabilities(server, fhandle);
1407         if (status == 0)
1408                 status = nfs4_do_fsinfo(server, fhandle, info);
1409         return nfs4_map_errors(status);
1410 }
1411
1412 /*
1413  * Get locations and (maybe) other attributes of a referral.
1414  * Note that we'll actually follow the referral later when
1415  * we detect fsid mismatch in inode revalidation
1416  */
1417 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1418 {
1419         int status = -ENOMEM;
1420         struct page *page = NULL;
1421         struct nfs4_fs_locations *locations = NULL;
1422         struct dentry dentry = {};
1423
1424         page = alloc_page(GFP_KERNEL);
1425         if (page == NULL)
1426                 goto out;
1427         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1428         if (locations == NULL)
1429                 goto out;
1430
1431         dentry.d_name.name = name->name;
1432         dentry.d_name.len = name->len;
1433         status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1434         if (status != 0)
1435                 goto out;
1436         /* Make sure server returned a different fsid for the referral */
1437         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1438                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1439                 status = -EIO;
1440                 goto out;
1441         }
1442
1443         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1444         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1445         if (!fattr->mode)
1446                 fattr->mode = S_IFDIR;
1447         memset(fhandle, 0, sizeof(struct nfs_fh));
1448 out:
1449         if (page)
1450                 __free_page(page);
1451         if (locations)
1452                 kfree(locations);
1453         return status;
1454 }
1455
1456 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1457 {
1458         struct nfs4_getattr_arg args = {
1459                 .fh = fhandle,
1460                 .bitmask = server->attr_bitmask,
1461         };
1462         struct nfs4_getattr_res res = {
1463                 .fattr = fattr,
1464                 .server = server,
1465         };
1466         struct rpc_message msg = {
1467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1468                 .rpc_argp = &args,
1469                 .rpc_resp = &res,
1470         };
1471
1472         nfs_fattr_init(fattr);
1473         return rpc_call_sync(server->client, &msg, 0);
1474 }
1475
1476 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1477 {
1478         struct nfs4_exception exception = { };
1479         int err;
1480         do {
1481                 err = nfs4_handle_exception(server,
1482                                 _nfs4_proc_getattr(server, fhandle, fattr),
1483                                 &exception);
1484         } while (exception.retry);
1485         return err;
1486 }
1487
1488 /*
1489  * The file is not closed if it is opened due to the a request to change
1490  * the size of the file. The open call will not be needed once the
1491  * VFS layer lookup-intents are implemented.
1492  *
1493  * Close is called when the inode is destroyed.
1494  * If we haven't opened the file for O_WRONLY, we
1495  * need to in the size_change case to obtain a stateid.
1496  *
1497  * Got race?
1498  * Because OPEN is always done by name in nfsv4, it is
1499  * possible that we opened a different file by the same
1500  * name.  We can recognize this race condition, but we
1501  * can't do anything about it besides returning an error.
1502  *
1503  * This will be fixed with VFS changes (lookup-intent).
1504  */
1505 static int
1506 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1507                   struct iattr *sattr)
1508 {
1509         struct rpc_cred *cred;
1510         struct inode *inode = dentry->d_inode;
1511         struct nfs_open_context *ctx;
1512         struct nfs4_state *state = NULL;
1513         int status;
1514
1515         nfs_fattr_init(fattr);
1516
1517         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1518         if (IS_ERR(cred))
1519                 return PTR_ERR(cred);
1520
1521         /* Search for an existing open(O_WRITE) file */
1522         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1523         if (ctx != NULL)
1524                 state = ctx->state;
1525
1526         status = nfs4_do_setattr(inode, fattr, sattr, state);
1527         if (status == 0)
1528                 nfs_setattr_update_inode(inode, sattr);
1529         if (ctx != NULL)
1530                 put_nfs_open_context(ctx);
1531         put_rpccred(cred);
1532         return status;
1533 }
1534
1535 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1536                 struct qstr *name, struct nfs_fh *fhandle,
1537                 struct nfs_fattr *fattr)
1538 {
1539         int                    status;
1540         struct nfs4_lookup_arg args = {
1541                 .bitmask = server->attr_bitmask,
1542                 .dir_fh = dirfh,
1543                 .name = name,
1544         };
1545         struct nfs4_lookup_res res = {
1546                 .server = server,
1547                 .fattr = fattr,
1548                 .fh = fhandle,
1549         };
1550         struct rpc_message msg = {
1551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1552                 .rpc_argp = &args,
1553                 .rpc_resp = &res,
1554         };
1555
1556         nfs_fattr_init(fattr);
1557
1558         dprintk("NFS call  lookupfh %s\n", name->name);
1559         status = rpc_call_sync(server->client, &msg, 0);
1560         dprintk("NFS reply lookupfh: %d\n", status);
1561         if (status == -NFS4ERR_MOVED)
1562                 status = -EREMOTE;
1563         return status;
1564 }
1565
1566 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1567                               struct qstr *name, struct nfs_fh *fhandle,
1568                               struct nfs_fattr *fattr)
1569 {
1570         struct nfs4_exception exception = { };
1571         int err;
1572         do {
1573                 err = nfs4_handle_exception(server,
1574                                 _nfs4_proc_lookupfh(server, dirfh, name,
1575                                                     fhandle, fattr),
1576                                 &exception);
1577         } while (exception.retry);
1578         return err;
1579 }
1580
1581 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1582                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1583 {
1584         int                    status;
1585         struct nfs_server *server = NFS_SERVER(dir);
1586         struct nfs4_lookup_arg args = {
1587                 .bitmask = server->attr_bitmask,
1588                 .dir_fh = NFS_FH(dir),
1589                 .name = name,
1590         };
1591         struct nfs4_lookup_res res = {
1592                 .server = server,
1593                 .fattr = fattr,
1594                 .fh = fhandle,
1595         };
1596         struct rpc_message msg = {
1597                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1598                 .rpc_argp = &args,
1599                 .rpc_resp = &res,
1600         };
1601
1602         nfs_fattr_init(fattr);
1603
1604         dprintk("NFS call  lookup %s\n", name->name);
1605         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1606         if (status == -NFS4ERR_MOVED)
1607                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1608         dprintk("NFS reply lookup: %d\n", status);
1609         return status;
1610 }
1611
1612 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1613 {
1614         struct nfs4_exception exception = { };
1615         int err;
1616         do {
1617                 err = nfs4_handle_exception(NFS_SERVER(dir),
1618                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1619                                 &exception);
1620         } while (exception.retry);
1621         return err;
1622 }
1623
1624 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1625 {
1626         struct nfs4_accessargs args = {
1627                 .fh = NFS_FH(inode),
1628         };
1629         struct nfs4_accessres res = { 0 };
1630         struct rpc_message msg = {
1631                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1632                 .rpc_argp = &args,
1633                 .rpc_resp = &res,
1634                 .rpc_cred = entry->cred,
1635         };
1636         int mode = entry->mask;
1637         int status;
1638
1639         /*
1640          * Determine which access bits we want to ask for...
1641          */
1642         if (mode & MAY_READ)
1643                 args.access |= NFS4_ACCESS_READ;
1644         if (S_ISDIR(inode->i_mode)) {
1645                 if (mode & MAY_WRITE)
1646                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1647                 if (mode & MAY_EXEC)
1648                         args.access |= NFS4_ACCESS_LOOKUP;
1649         } else {
1650                 if (mode & MAY_WRITE)
1651                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1652                 if (mode & MAY_EXEC)
1653                         args.access |= NFS4_ACCESS_EXECUTE;
1654         }
1655         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1656         if (!status) {
1657                 entry->mask = 0;
1658                 if (res.access & NFS4_ACCESS_READ)
1659                         entry->mask |= MAY_READ;
1660                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1661                         entry->mask |= MAY_WRITE;
1662                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1663                         entry->mask |= MAY_EXEC;
1664         }
1665         return status;
1666 }
1667
1668 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1669 {
1670         struct nfs4_exception exception = { };
1671         int err;
1672         do {
1673                 err = nfs4_handle_exception(NFS_SERVER(inode),
1674                                 _nfs4_proc_access(inode, entry),
1675                                 &exception);
1676         } while (exception.retry);
1677         return err;
1678 }
1679
1680 /*
1681  * TODO: For the time being, we don't try to get any attributes
1682  * along with any of the zero-copy operations READ, READDIR,
1683  * READLINK, WRITE.
1684  *
1685  * In the case of the first three, we want to put the GETATTR
1686  * after the read-type operation -- this is because it is hard
1687  * to predict the length of a GETATTR response in v4, and thus
1688  * align the READ data correctly.  This means that the GETATTR
1689  * may end up partially falling into the page cache, and we should
1690  * shift it into the 'tail' of the xdr_buf before processing.
1691  * To do this efficiently, we need to know the total length
1692  * of data received, which doesn't seem to be available outside
1693  * of the RPC layer.
1694  *
1695  * In the case of WRITE, we also want to put the GETATTR after
1696  * the operation -- in this case because we want to make sure
1697  * we get the post-operation mtime and size.  This means that
1698  * we can't use xdr_encode_pages() as written: we need a variant
1699  * of it which would leave room in the 'tail' iovec.
1700  *
1701  * Both of these changes to the XDR layer would in fact be quite
1702  * minor, but I decided to leave them for a subsequent patch.
1703  */
1704 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1705                 unsigned int pgbase, unsigned int pglen)
1706 {
1707         struct nfs4_readlink args = {
1708                 .fh       = NFS_FH(inode),
1709                 .pgbase   = pgbase,
1710                 .pglen    = pglen,
1711                 .pages    = &page,
1712         };
1713         struct rpc_message msg = {
1714                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1715                 .rpc_argp = &args,
1716                 .rpc_resp = NULL,
1717         };
1718
1719         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1720 }
1721
1722 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1723                 unsigned int pgbase, unsigned int pglen)
1724 {
1725         struct nfs4_exception exception = { };
1726         int err;
1727         do {
1728                 err = nfs4_handle_exception(NFS_SERVER(inode),
1729                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1730                                 &exception);
1731         } while (exception.retry);
1732         return err;
1733 }
1734
1735 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1736 {
1737         int flags = rdata->flags;
1738         struct inode *inode = rdata->inode;
1739         struct nfs_fattr *fattr = rdata->res.fattr;
1740         struct nfs_server *server = NFS_SERVER(inode);
1741         struct rpc_message msg = {
1742                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1743                 .rpc_argp       = &rdata->args,
1744                 .rpc_resp       = &rdata->res,
1745                 .rpc_cred       = rdata->cred,
1746         };
1747         unsigned long timestamp = jiffies;
1748         int status;
1749
1750         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1751                         (long long) rdata->args.offset);
1752
1753         nfs_fattr_init(fattr);
1754         status = rpc_call_sync(server->client, &msg, flags);
1755         if (!status)
1756                 renew_lease(server, timestamp);
1757         dprintk("NFS reply read: %d\n", status);
1758         return status;
1759 }
1760
1761 static int nfs4_proc_read(struct nfs_read_data *rdata)
1762 {
1763         struct nfs4_exception exception = { };
1764         int err;
1765         do {
1766                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1767                                 _nfs4_proc_read(rdata),
1768                                 &exception);
1769         } while (exception.retry);
1770         return err;
1771 }
1772
1773 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1774 {
1775         int rpcflags = wdata->flags;
1776         struct inode *inode = wdata->inode;
1777         struct nfs_fattr *fattr = wdata->res.fattr;
1778         struct nfs_server *server = NFS_SERVER(inode);
1779         struct rpc_message msg = {
1780                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1781                 .rpc_argp       = &wdata->args,
1782                 .rpc_resp       = &wdata->res,
1783                 .rpc_cred       = wdata->cred,
1784         };
1785         int status;
1786
1787         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1788                         (long long) wdata->args.offset);
1789
1790         wdata->args.bitmask = server->attr_bitmask;
1791         wdata->res.server = server;
1792         wdata->timestamp = jiffies;
1793         nfs_fattr_init(fattr);
1794         status = rpc_call_sync(server->client, &msg, rpcflags);
1795         dprintk("NFS reply write: %d\n", status);
1796         if (status < 0)
1797                 return status;
1798         renew_lease(server, wdata->timestamp);
1799         nfs_post_op_update_inode(inode, fattr);
1800         return wdata->res.count;
1801 }
1802
1803 static int nfs4_proc_write(struct nfs_write_data *wdata)
1804 {
1805         struct nfs4_exception exception = { };
1806         int err;
1807         do {
1808                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1809                                 _nfs4_proc_write(wdata),
1810                                 &exception);
1811         } while (exception.retry);
1812         return err;
1813 }
1814
1815 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1816 {
1817         struct inode *inode = cdata->inode;
1818         struct nfs_fattr *fattr = cdata->res.fattr;
1819         struct nfs_server *server = NFS_SERVER(inode);
1820         struct rpc_message msg = {
1821                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1822                 .rpc_argp       = &cdata->args,
1823                 .rpc_resp       = &cdata->res,
1824                 .rpc_cred       = cdata->cred,
1825         };
1826         int status;
1827
1828         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1829                         (long long) cdata->args.offset);
1830
1831         cdata->args.bitmask = server->attr_bitmask;
1832         cdata->res.server = server;
1833         cdata->timestamp = jiffies;
1834         nfs_fattr_init(fattr);
1835         status = rpc_call_sync(server->client, &msg, 0);
1836         if (status >= 0)
1837                 renew_lease(server, cdata->timestamp);
1838         dprintk("NFS reply commit: %d\n", status);
1839         if (status >= 0)
1840                 nfs_post_op_update_inode(inode, fattr);
1841         return status;
1842 }
1843
1844 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1845 {
1846         struct nfs4_exception exception = { };
1847         int err;
1848         do {
1849                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1850                                 _nfs4_proc_commit(cdata),
1851                                 &exception);
1852         } while (exception.retry);
1853         return err;
1854 }
1855
1856 /*
1857  * Got race?
1858  * We will need to arrange for the VFS layer to provide an atomic open.
1859  * Until then, this create/open method is prone to inefficiency and race
1860  * conditions due to the lookup, create, and open VFS calls from sys_open()
1861  * placed on the wire.
1862  *
1863  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1864  * The file will be opened again in the subsequent VFS open call
1865  * (nfs4_proc_file_open).
1866  *
1867  * The open for read will just hang around to be used by any process that
1868  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1869  */
1870
1871 static int
1872 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1873                  int flags, struct nameidata *nd)
1874 {
1875         struct nfs4_state *state;
1876         struct rpc_cred *cred;
1877         int status = 0;
1878
1879         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1880         if (IS_ERR(cred)) {
1881                 status = PTR_ERR(cred);
1882                 goto out;
1883         }
1884         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1885         put_rpccred(cred);
1886         if (IS_ERR(state)) {
1887                 status = PTR_ERR(state);
1888                 goto out;
1889         }
1890         d_instantiate(dentry, igrab(state->inode));
1891         if (flags & O_EXCL) {
1892                 struct nfs_fattr fattr;
1893                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1894                 if (status == 0)
1895                         nfs_setattr_update_inode(state->inode, sattr);
1896         }
1897         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1898                 status = nfs4_intent_set_file(nd, dentry, state);
1899         else
1900                 nfs4_close_state(state, flags);
1901 out:
1902         return status;
1903 }
1904
1905 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1906 {
1907         struct nfs_server *server = NFS_SERVER(dir);
1908         struct nfs4_remove_arg args = {
1909                 .fh = NFS_FH(dir),
1910                 .name = name,
1911                 .bitmask = server->attr_bitmask,
1912         };
1913         struct nfs_fattr dir_attr;
1914         struct nfs4_remove_res  res = {
1915                 .server = server,
1916                 .dir_attr = &dir_attr,
1917         };
1918         struct rpc_message msg = {
1919                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1920                 .rpc_argp       = &args,
1921                 .rpc_resp       = &res,
1922         };
1923         int                     status;
1924
1925         nfs_fattr_init(res.dir_attr);
1926         status = rpc_call_sync(server->client, &msg, 0);
1927         if (status == 0) {
1928                 update_changeattr(dir, &res.cinfo);
1929                 nfs_post_op_update_inode(dir, res.dir_attr);
1930         }
1931         return status;
1932 }
1933
1934 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1935 {
1936         struct nfs4_exception exception = { };
1937         int err;
1938         do {
1939                 err = nfs4_handle_exception(NFS_SERVER(dir),
1940                                 _nfs4_proc_remove(dir, name),
1941                                 &exception);
1942         } while (exception.retry);
1943         return err;
1944 }
1945
1946 struct unlink_desc {
1947         struct nfs4_remove_arg  args;
1948         struct nfs4_remove_res  res;
1949         struct nfs_fattr dir_attr;
1950 };
1951
1952 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1953                 struct qstr *name)
1954 {
1955         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1956         struct unlink_desc *up;
1957
1958         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1959         if (!up)
1960                 return -ENOMEM;
1961
1962         up->args.fh = NFS_FH(dir->d_inode);
1963         up->args.name = name;
1964         up->args.bitmask = server->attr_bitmask;
1965         up->res.server = server;
1966         up->res.dir_attr = &up->dir_attr;
1967
1968         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1969         msg->rpc_argp = &up->args;
1970         msg->rpc_resp = &up->res;
1971         return 0;
1972 }
1973
1974 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1975 {
1976         struct rpc_message *msg = &task->tk_msg;
1977         struct unlink_desc *up;
1978
1979         if (msg->rpc_resp != NULL) {
1980                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1981                 update_changeattr(dir->d_inode, &up->res.cinfo);
1982                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1983                 kfree(up);
1984                 msg->rpc_resp = NULL;
1985                 msg->rpc_argp = NULL;
1986         }
1987         return 0;
1988 }
1989
1990 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1991                 struct inode *new_dir, struct qstr *new_name)
1992 {
1993         struct nfs_server *server = NFS_SERVER(old_dir);
1994         struct nfs4_rename_arg arg = {
1995                 .old_dir = NFS_FH(old_dir),
1996                 .new_dir = NFS_FH(new_dir),
1997                 .old_name = old_name,
1998                 .new_name = new_name,
1999                 .bitmask = server->attr_bitmask,
2000         };
2001         struct nfs_fattr old_fattr, new_fattr;
2002         struct nfs4_rename_res res = {
2003                 .server = server,
2004                 .old_fattr = &old_fattr,
2005                 .new_fattr = &new_fattr,
2006         };
2007         struct rpc_message msg = {
2008                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2009                 .rpc_argp = &arg,
2010                 .rpc_resp = &res,
2011         };
2012         int                     status;
2013
2014         nfs_fattr_init(res.old_fattr);
2015         nfs_fattr_init(res.new_fattr);
2016         status = rpc_call_sync(server->client, &msg, 0);
2017
2018         if (!status) {
2019                 update_changeattr(old_dir, &res.old_cinfo);
2020                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2021                 update_changeattr(new_dir, &res.new_cinfo);
2022                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2023         }
2024         return status;
2025 }
2026
2027 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2028                 struct inode *new_dir, struct qstr *new_name)
2029 {
2030         struct nfs4_exception exception = { };
2031         int err;
2032         do {
2033                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2034                                 _nfs4_proc_rename(old_dir, old_name,
2035                                         new_dir, new_name),
2036                                 &exception);
2037         } while (exception.retry);
2038         return err;
2039 }
2040
2041 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2042 {
2043         struct nfs_server *server = NFS_SERVER(inode);
2044         struct nfs4_link_arg arg = {
2045                 .fh     = NFS_FH(inode),
2046                 .dir_fh = NFS_FH(dir),
2047                 .name   = name,
2048                 .bitmask = server->attr_bitmask,
2049         };
2050         struct nfs_fattr fattr, dir_attr;
2051         struct nfs4_link_res res = {
2052                 .server = server,
2053                 .fattr = &fattr,
2054                 .dir_attr = &dir_attr,
2055         };
2056         struct rpc_message msg = {
2057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2058                 .rpc_argp = &arg,
2059                 .rpc_resp = &res,
2060         };
2061         int                     status;
2062
2063         nfs_fattr_init(res.fattr);
2064         nfs_fattr_init(res.dir_attr);
2065         status = rpc_call_sync(server->client, &msg, 0);
2066         if (!status) {
2067                 update_changeattr(dir, &res.cinfo);
2068                 nfs_post_op_update_inode(dir, res.dir_attr);
2069                 nfs_post_op_update_inode(inode, res.fattr);
2070         }
2071
2072         return status;
2073 }
2074
2075 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2076 {
2077         struct nfs4_exception exception = { };
2078         int err;
2079         do {
2080                 err = nfs4_handle_exception(NFS_SERVER(inode),
2081                                 _nfs4_proc_link(inode, dir, name),
2082                                 &exception);
2083         } while (exception.retry);
2084         return err;
2085 }
2086
2087 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2088                 struct qstr *path, struct iattr *sattr)
2089 {
2090         struct nfs_server *server = NFS_SERVER(dir);
2091         struct nfs_fh fhandle;
2092         struct nfs_fattr fattr, dir_fattr;
2093         struct nfs4_create_arg arg = {
2094                 .dir_fh = NFS_FH(dir),
2095                 .server = server,
2096                 .name = &dentry->d_name,
2097                 .attrs = sattr,
2098                 .ftype = NF4LNK,
2099                 .bitmask = server->attr_bitmask,
2100         };
2101         struct nfs4_create_res res = {
2102                 .server = server,
2103                 .fh = &fhandle,
2104                 .fattr = &fattr,
2105                 .dir_fattr = &dir_fattr,
2106         };
2107         struct rpc_message msg = {
2108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2109                 .rpc_argp = &arg,
2110                 .rpc_resp = &res,
2111         };
2112         int                     status;
2113
2114         if (path->len > NFS4_MAXPATHLEN)
2115                 return -ENAMETOOLONG;
2116
2117         arg.u.symlink = path;
2118         nfs_fattr_init(&fattr);
2119         nfs_fattr_init(&dir_fattr);
2120
2121         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2122         if (!status) {
2123                 update_changeattr(dir, &res.dir_cinfo);
2124                 nfs_post_op_update_inode(dir, res.dir_fattr);
2125                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2126         }
2127         return status;
2128 }
2129
2130 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2131                 struct qstr *path, struct iattr *sattr)
2132 {
2133         struct nfs4_exception exception = { };
2134         int err;
2135         do {
2136                 err = nfs4_handle_exception(NFS_SERVER(dir),
2137                                 _nfs4_proc_symlink(dir, dentry, path, sattr),
2138                                 &exception);
2139         } while (exception.retry);
2140         return err;
2141 }
2142
2143 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2144                 struct iattr *sattr)
2145 {
2146         struct nfs_server *server = NFS_SERVER(dir);
2147         struct nfs_fh fhandle;
2148         struct nfs_fattr fattr, dir_fattr;
2149         struct nfs4_create_arg arg = {
2150                 .dir_fh = NFS_FH(dir),
2151                 .server = server,
2152                 .name = &dentry->d_name,
2153                 .attrs = sattr,
2154                 .ftype = NF4DIR,
2155                 .bitmask = server->attr_bitmask,
2156         };
2157         struct nfs4_create_res res = {
2158                 .server = server,
2159                 .fh = &fhandle,
2160                 .fattr = &fattr,
2161                 .dir_fattr = &dir_fattr,
2162         };
2163         struct rpc_message msg = {
2164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2165                 .rpc_argp = &arg,
2166                 .rpc_resp = &res,
2167         };
2168         int                     status;
2169
2170         nfs_fattr_init(&fattr);
2171         nfs_fattr_init(&dir_fattr);
2172
2173         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2174         if (!status) {
2175                 update_changeattr(dir, &res.dir_cinfo);
2176                 nfs_post_op_update_inode(dir, res.dir_fattr);
2177                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2178         }
2179         return status;
2180 }
2181
2182 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2183                 struct iattr *sattr)
2184 {
2185         struct nfs4_exception exception = { };
2186         int err;
2187         do {
2188                 err = nfs4_handle_exception(NFS_SERVER(dir),
2189                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2190                                 &exception);
2191         } while (exception.retry);
2192         return err;
2193 }
2194
2195 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2196                   u64 cookie, struct page *page, unsigned int count, int plus)
2197 {
2198         struct inode            *dir = dentry->d_inode;
2199         struct nfs4_readdir_arg args = {
2200                 .fh = NFS_FH(dir),
2201                 .pages = &page,
2202                 .pgbase = 0,
2203                 .count = count,
2204                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2205         };
2206         struct nfs4_readdir_res res;
2207         struct rpc_message msg = {
2208                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2209                 .rpc_argp = &args,
2210                 .rpc_resp = &res,
2211                 .rpc_cred = cred,
2212         };
2213         int                     status;
2214
2215         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2216                         dentry->d_parent->d_name.name,
2217                         dentry->d_name.name,
2218                         (unsigned long long)cookie);
2219         lock_kernel();
2220         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2221         res.pgbase = args.pgbase;
2222         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2223         if (status == 0)
2224                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2225         unlock_kernel();
2226         dprintk("%s: returns %d\n", __FUNCTION__, status);
2227         return status;
2228 }
2229
2230 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2231                   u64 cookie, struct page *page, unsigned int count, int plus)
2232 {
2233         struct nfs4_exception exception = { };
2234         int err;
2235         do {
2236                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2237                                 _nfs4_proc_readdir(dentry, cred, cookie,
2238                                         page, count, plus),
2239                                 &exception);
2240         } while (exception.retry);
2241         return err;
2242 }
2243
2244 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2245                 struct iattr *sattr, dev_t rdev)
2246 {
2247         struct nfs_server *server = NFS_SERVER(dir);
2248         struct nfs_fh fh;
2249         struct nfs_fattr fattr, dir_fattr;
2250         struct nfs4_create_arg arg = {
2251                 .dir_fh = NFS_FH(dir),
2252                 .server = server,
2253                 .name = &dentry->d_name,
2254                 .attrs = sattr,
2255                 .bitmask = server->attr_bitmask,
2256         };
2257         struct nfs4_create_res res = {
2258                 .server = server,
2259                 .fh = &fh,
2260                 .fattr = &fattr,
2261                 .dir_fattr = &dir_fattr,
2262         };
2263         struct rpc_message msg = {
2264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2265                 .rpc_argp = &arg,
2266                 .rpc_resp = &res,
2267         };
2268         int                     status;
2269         int                     mode = sattr->ia_mode;
2270
2271         nfs_fattr_init(&fattr);
2272         nfs_fattr_init(&dir_fattr);
2273
2274         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2275         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2276         if (S_ISFIFO(mode))
2277                 arg.ftype = NF4FIFO;
2278         else if (S_ISBLK(mode)) {
2279                 arg.ftype = NF4BLK;
2280                 arg.u.device.specdata1 = MAJOR(rdev);
2281                 arg.u.device.specdata2 = MINOR(rdev);
2282         }
2283         else if (S_ISCHR(mode)) {
2284                 arg.ftype = NF4CHR;
2285                 arg.u.device.specdata1 = MAJOR(rdev);
2286                 arg.u.device.specdata2 = MINOR(rdev);
2287         }
2288         else
2289                 arg.ftype = NF4SOCK;
2290
2291         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2292         if (status == 0) {
2293                 update_changeattr(dir, &res.dir_cinfo);
2294                 nfs_post_op_update_inode(dir, res.dir_fattr);
2295                 status = nfs_instantiate(dentry, &fh, &fattr);
2296         }
2297         return status;
2298 }
2299
2300 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2301                 struct iattr *sattr, dev_t rdev)
2302 {
2303         struct nfs4_exception exception = { };
2304         int err;
2305         do {
2306                 err = nfs4_handle_exception(NFS_SERVER(dir),
2307                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2308                                 &exception);
2309         } while (exception.retry);
2310         return err;
2311 }
2312
2313 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2314                  struct nfs_fsstat *fsstat)
2315 {
2316         struct nfs4_statfs_arg args = {
2317                 .fh = fhandle,
2318                 .bitmask = server->attr_bitmask,
2319         };
2320         struct rpc_message msg = {
2321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2322                 .rpc_argp = &args,
2323                 .rpc_resp = fsstat,
2324         };
2325
2326         nfs_fattr_init(fsstat->fattr);
2327         return rpc_call_sync(server->client, &msg, 0);
2328 }
2329
2330 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2331 {
2332         struct nfs4_exception exception = { };
2333         int err;
2334         do {
2335                 err = nfs4_handle_exception(server,
2336                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2337                                 &exception);
2338         } while (exception.retry);
2339         return err;
2340 }
2341
2342 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2343                 struct nfs_fsinfo *fsinfo)
2344 {
2345         struct nfs4_fsinfo_arg args = {
2346                 .fh = fhandle,
2347                 .bitmask = server->attr_bitmask,
2348         };
2349         struct rpc_message msg = {
2350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2351                 .rpc_argp = &args,
2352                 .rpc_resp = fsinfo,
2353         };
2354
2355         return rpc_call_sync(server->client, &msg, 0);
2356 }
2357
2358 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2359 {
2360         struct nfs4_exception exception = { };
2361         int err;
2362
2363         do {
2364                 err = nfs4_handle_exception(server,
2365                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2366                                 &exception);
2367         } while (exception.retry);
2368         return err;
2369 }
2370
2371 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2372 {
2373         nfs_fattr_init(fsinfo->fattr);
2374         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2375 }
2376
2377 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2378                 struct nfs_pathconf *pathconf)
2379 {
2380         struct nfs4_pathconf_arg args = {
2381                 .fh = fhandle,
2382                 .bitmask = server->attr_bitmask,
2383         };
2384         struct rpc_message msg = {
2385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2386                 .rpc_argp = &args,
2387                 .rpc_resp = pathconf,
2388         };
2389
2390         /* None of the pathconf attributes are mandatory to implement */
2391         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2392                 memset(pathconf, 0, sizeof(*pathconf));
2393                 return 0;
2394         }
2395
2396         nfs_fattr_init(pathconf->fattr);
2397         return rpc_call_sync(server->client, &msg, 0);
2398 }
2399
2400 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2401                 struct nfs_pathconf *pathconf)
2402 {
2403         struct nfs4_exception exception = { };
2404         int err;
2405
2406         do {
2407                 err = nfs4_handle_exception(server,
2408                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2409                                 &exception);
2410         } while (exception.retry);
2411         return err;
2412 }
2413
2414 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2415 {
2416         struct nfs_server *server = NFS_SERVER(data->inode);
2417
2418         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2419                 rpc_restart_call(task);
2420                 return -EAGAIN;
2421         }
2422         if (task->tk_status > 0)
2423                 renew_lease(server, data->timestamp);
2424         return 0;
2425 }
2426
2427 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2428 {
2429         struct rpc_message msg = {
2430                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2431                 .rpc_argp = &data->args,
2432                 .rpc_resp = &data->res,
2433                 .rpc_cred = data->cred,
2434         };
2435
2436         data->timestamp   = jiffies;
2437
2438         rpc_call_setup(&data->task, &msg, 0);
2439 }
2440
2441 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2442 {
2443         struct inode *inode = data->inode;
2444
2445         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2446                 rpc_restart_call(task);
2447                 return -EAGAIN;
2448         }
2449         if (task->tk_status >= 0) {
2450                 renew_lease(NFS_SERVER(inode), data->timestamp);
2451                 nfs_post_op_update_inode(inode, data->res.fattr);
2452         }
2453         return 0;
2454 }
2455
2456 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2457 {
2458         struct rpc_message msg = {
2459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2460                 .rpc_argp = &data->args,
2461                 .rpc_resp = &data->res,
2462                 .rpc_cred = data->cred,
2463         };
2464         struct inode *inode = data->inode;
2465         struct nfs_server *server = NFS_SERVER(inode);
2466         int stable;
2467
2468         if (how & FLUSH_STABLE) {
2469                 if (!NFS_I(inode)->ncommit)
2470                         stable = NFS_FILE_SYNC;
2471                 else
2472                         stable = NFS_DATA_SYNC;
2473         } else
2474                 stable = NFS_UNSTABLE;
2475         data->args.stable = stable;
2476         data->args.bitmask = server->attr_bitmask;
2477         data->res.server = server;
2478
2479         data->timestamp   = jiffies;
2480
2481         /* Finalize the task. */
2482         rpc_call_setup(&data->task, &msg, 0);
2483 }
2484
2485 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2486 {
2487         struct inode *inode = data->inode;
2488
2489         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2490                 rpc_restart_call(task);
2491                 return -EAGAIN;
2492         }
2493         if (task->tk_status >= 0)
2494                 nfs_post_op_update_inode(inode, data->res.fattr);
2495         return 0;
2496 }
2497
2498 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2499 {
2500         struct rpc_message msg = {
2501                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2502                 .rpc_argp = &data->args,
2503                 .rpc_resp = &data->res,
2504                 .rpc_cred = data->cred,
2505         };
2506         struct nfs_server *server = NFS_SERVER(data->inode);
2507
2508         data->args.bitmask = server->attr_bitmask;
2509         data->res.server = server;
2510
2511         rpc_call_setup(&data->task, &msg, 0);
2512 }
2513
2514 /*
2515  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2516  * standalone procedure for queueing an asynchronous RENEW.
2517  */
2518 static void nfs4_renew_done(struct rpc_task *task, void *data)
2519 {
2520         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2521         unsigned long timestamp = (unsigned long)data;
2522
2523         if (task->tk_status < 0) {
2524                 switch (task->tk_status) {
2525                         case -NFS4ERR_STALE_CLIENTID:
2526                         case -NFS4ERR_EXPIRED:
2527                         case -NFS4ERR_CB_PATH_DOWN:
2528                                 nfs4_schedule_state_recovery(clp);
2529                 }
2530                 return;
2531         }
2532         spin_lock(&clp->cl_lock);
2533         if (time_before(clp->cl_last_renewal,timestamp))
2534                 clp->cl_last_renewal = timestamp;
2535         spin_unlock(&clp->cl_lock);
2536 }
2537
2538 static const struct rpc_call_ops nfs4_renew_ops = {
2539         .rpc_call_done = nfs4_renew_done,
2540 };
2541
2542 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2543 {
2544         struct rpc_message msg = {
2545                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2546                 .rpc_argp       = clp,
2547                 .rpc_cred       = cred,
2548         };
2549
2550         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2551                         &nfs4_renew_ops, (void *)jiffies);
2552 }
2553
2554 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2555 {
2556         struct rpc_message msg = {
2557                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2558                 .rpc_argp       = clp,
2559                 .rpc_cred       = cred,
2560         };
2561         unsigned long now = jiffies;
2562         int status;
2563
2564         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2565         if (status < 0)
2566                 return status;
2567         spin_lock(&clp->cl_lock);
2568         if (time_before(clp->cl_last_renewal,now))
2569                 clp->cl_last_renewal = now;
2570         spin_unlock(&clp->cl_lock);
2571         return 0;
2572 }
2573
2574 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2575 {
2576         return (server->caps & NFS_CAP_ACLS)
2577                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2578                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2579 }
2580
2581 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2582  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2583  * the stack.
2584  */
2585 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2586
2587 static void buf_to_pages(const void *buf, size_t buflen,
2588                 struct page **pages, unsigned int *pgbase)
2589 {
2590         const void *p = buf;
2591
2592         *pgbase = offset_in_page(buf);
2593         p -= *pgbase;
2594         while (p < buf + buflen) {
2595                 *(pages++) = virt_to_page(p);
2596                 p += PAGE_CACHE_SIZE;
2597         }
2598 }
2599
2600 struct nfs4_cached_acl {
2601         int cached;
2602         size_t len;
2603         char data[0];
2604 };
2605
2606 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2607 {
2608         struct nfs_inode *nfsi = NFS_I(inode);
2609
2610         spin_lock(&inode->i_lock);
2611         kfree(nfsi->nfs4_acl);
2612         nfsi->nfs4_acl = acl;
2613         spin_unlock(&inode->i_lock);
2614 }
2615
2616 static void nfs4_zap_acl_attr(struct inode *inode)
2617 {
2618         nfs4_set_cached_acl(inode, NULL);
2619 }
2620
2621 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2622 {
2623         struct nfs_inode *nfsi = NFS_I(inode);
2624         struct nfs4_cached_acl *acl;
2625         int ret = -ENOENT;
2626
2627         spin_lock(&inode->i_lock);
2628         acl = nfsi->nfs4_acl;
2629         if (acl == NULL)
2630                 goto out;
2631         if (buf == NULL) /* user is just asking for length */
2632                 goto out_len;
2633         if (acl->cached == 0)
2634                 goto out;
2635         ret = -ERANGE; /* see getxattr(2) man page */
2636         if (acl->len > buflen)
2637                 goto out;
2638         memcpy(buf, acl->data, acl->len);
2639 out_len:
2640         ret = acl->len;
2641 out:
2642         spin_unlock(&inode->i_lock);
2643         return ret;
2644 }
2645
2646 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2647 {
2648         struct nfs4_cached_acl *acl;
2649
2650         if (buf && acl_len <= PAGE_SIZE) {
2651                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2652                 if (acl == NULL)
2653                         goto out;
2654                 acl->cached = 1;
2655                 memcpy(acl->data, buf, acl_len);
2656         } else {
2657                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2658                 if (acl == NULL)
2659                         goto out;
2660                 acl->cached = 0;
2661         }
2662         acl->len = acl_len;
2663 out:
2664         nfs4_set_cached_acl(inode, acl);
2665 }
2666
2667 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2668 {
2669         struct page *pages[NFS4ACL_MAXPAGES];
2670         struct nfs_getaclargs args = {
2671                 .fh = NFS_FH(inode),
2672                 .acl_pages = pages,
2673                 .acl_len = buflen,
2674         };
2675         size_t resp_len = buflen;
2676         void *resp_buf;
2677         struct rpc_message msg = {
2678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2679                 .rpc_argp = &args,
2680                 .rpc_resp = &resp_len,
2681         };
2682         struct page *localpage = NULL;
2683         int ret;
2684
2685         if (buflen < PAGE_SIZE) {
2686                 /* As long as we're doing a round trip to the server anyway,
2687                  * let's be prepared for a page of acl data. */
2688                 localpage = alloc_page(GFP_KERNEL);
2689                 resp_buf = page_address(localpage);
2690                 if (localpage == NULL)
2691                         return -ENOMEM;
2692                 args.acl_pages[0] = localpage;
2693                 args.acl_pgbase = 0;
2694                 resp_len = args.acl_len = PAGE_SIZE;
2695         } else {
2696                 resp_buf = buf;
2697                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2698         }
2699         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2700         if (ret)
2701                 goto out_free;
2702         if (resp_len > args.acl_len)
2703                 nfs4_write_cached_acl(inode, NULL, resp_len);
2704         else
2705                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2706         if (buf) {
2707                 ret = -ERANGE;
2708                 if (resp_len > buflen)
2709                         goto out_free;
2710                 if (localpage)
2711                         memcpy(buf, resp_buf, resp_len);
2712         }
2713         ret = resp_len;
2714 out_free:
2715         if (localpage)
2716                 __free_page(localpage);
2717         return ret;
2718 }
2719
2720 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2721 {
2722         struct nfs4_exception exception = { };
2723         ssize_t ret;
2724         do {
2725                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2726                 if (ret >= 0)
2727                         break;
2728                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2729         } while (exception.retry);
2730         return ret;
2731 }
2732
2733 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2734 {
2735         struct nfs_server *server = NFS_SERVER(inode);
2736         int ret;
2737
2738         if (!nfs4_server_supports_acls(server))
2739                 return -EOPNOTSUPP;
2740         ret = nfs_revalidate_inode(server, inode);
2741         if (ret < 0)
2742                 return ret;
2743         ret = nfs4_read_cached_acl(inode, buf, buflen);
2744         if (ret != -ENOENT)
2745                 return ret;
2746         return nfs4_get_acl_uncached(inode, buf, buflen);
2747 }
2748
2749 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2750 {
2751         struct nfs_server *server = NFS_SERVER(inode);
2752         struct page *pages[NFS4ACL_MAXPAGES];
2753         struct nfs_setaclargs arg = {
2754                 .fh             = NFS_FH(inode),
2755                 .acl_pages      = pages,
2756                 .acl_len        = buflen,
2757         };
2758         struct rpc_message msg = {
2759                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2760                 .rpc_argp       = &arg,
2761                 .rpc_resp       = NULL,
2762         };
2763         int ret;
2764
2765         if (!nfs4_server_supports_acls(server))
2766                 return -EOPNOTSUPP;
2767         nfs_inode_return_delegation(inode);
2768         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2769         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2770         if (ret == 0)
2771                 nfs4_write_cached_acl(inode, buf, buflen);
2772         return ret;
2773 }
2774
2775 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2776 {
2777         struct nfs4_exception exception = { };
2778         int err;
2779         do {
2780                 err = nfs4_handle_exception(NFS_SERVER(inode),
2781                                 __nfs4_proc_set_acl(inode, buf, buflen),
2782                                 &exception);
2783         } while (exception.retry);
2784         return err;
2785 }
2786
2787 static int
2788 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2789 {
2790         struct nfs_client *clp = server->nfs_client;
2791
2792         if (!clp || task->tk_status >= 0)
2793                 return 0;
2794         switch(task->tk_status) {
2795                 case -NFS4ERR_STALE_CLIENTID:
2796                 case -NFS4ERR_STALE_STATEID:
2797                 case -NFS4ERR_EXPIRED:
2798                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2799                         nfs4_schedule_state_recovery(clp);
2800                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2801                                 rpc_wake_up_task(task);
2802                         task->tk_status = 0;
2803                         return -EAGAIN;
2804                 case -NFS4ERR_DELAY:
2805                         nfs_inc_server_stats((struct nfs_server *) server,
2806                                                 NFSIOS_DELAY);
2807                 case -NFS4ERR_GRACE:
2808                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2809                         task->tk_status = 0;
2810                         return -EAGAIN;
2811                 case -NFS4ERR_OLD_STATEID:
2812                         task->tk_status = 0;
2813                         return -EAGAIN;
2814         }
2815         task->tk_status = nfs4_map_errors(task->tk_status);
2816         return 0;
2817 }
2818
2819 static int nfs4_wait_bit_interruptible(void *word)
2820 {
2821         if (signal_pending(current))
2822                 return -ERESTARTSYS;
2823         schedule();
2824         return 0;
2825 }
2826
2827 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2828 {
2829         sigset_t oldset;
2830         int res;
2831
2832         might_sleep();
2833
2834         rpc_clnt_sigmask(clnt, &oldset);
2835         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2836                         nfs4_wait_bit_interruptible,
2837                         TASK_INTERRUPTIBLE);
2838         rpc_clnt_sigunmask(clnt, &oldset);
2839         return res;
2840 }
2841
2842 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2843 {
2844         sigset_t oldset;
2845         int res = 0;
2846
2847         might_sleep();
2848
2849         if (*timeout <= 0)
2850                 *timeout = NFS4_POLL_RETRY_MIN;
2851         if (*timeout > NFS4_POLL_RETRY_MAX)
2852                 *timeout = NFS4_POLL_RETRY_MAX;
2853         rpc_clnt_sigmask(clnt, &oldset);
2854         if (clnt->cl_intr) {
2855                 schedule_timeout_interruptible(*timeout);
2856                 if (signalled())
2857                         res = -ERESTARTSYS;
2858         } else
2859                 schedule_timeout_uninterruptible(*timeout);
2860         rpc_clnt_sigunmask(clnt, &oldset);
2861         *timeout <<= 1;
2862         return res;
2863 }
2864
2865 /* This is the error handling routine for processes that are allowed
2866  * to sleep.
2867  */
2868 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2869 {
2870         struct nfs_client *clp = server->nfs_client;
2871         int ret = errorcode;
2872
2873         exception->retry = 0;
2874         switch(errorcode) {
2875                 case 0:
2876                         return 0;
2877                 case -NFS4ERR_STALE_CLIENTID:
2878                 case -NFS4ERR_STALE_STATEID:
2879                 case -NFS4ERR_EXPIRED:
2880                         nfs4_schedule_state_recovery(clp);
2881                         ret = nfs4_wait_clnt_recover(server->client, clp);
2882                         if (ret == 0)
2883                                 exception->retry = 1;
2884                         break;
2885                 case -NFS4ERR_GRACE:
2886                 case -NFS4ERR_DELAY:
2887                         ret = nfs4_delay(server->client, &exception->timeout);
2888                         if (ret != 0)
2889                                 break;
2890                 case -NFS4ERR_OLD_STATEID:
2891                         exception->retry = 1;
2892         }
2893         /* We failed to handle the error */
2894         return nfs4_map_errors(ret);
2895 }
2896
2897 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2898 {
2899         nfs4_verifier sc_verifier;
2900         struct nfs4_setclientid setclientid = {
2901                 .sc_verifier = &sc_verifier,
2902                 .sc_prog = program,
2903         };
2904         struct rpc_message msg = {
2905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2906                 .rpc_argp = &setclientid,
2907                 .rpc_resp = clp,
2908                 .rpc_cred = cred,
2909         };
2910         u32 *p;
2911         int loop = 0;
2912         int status;
2913
2914         p = (u32*)sc_verifier.data;
2915         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2916         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2917
2918         for(;;) {
2919                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2920                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2921                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2922                                 cred->cr_ops->cr_name,
2923                                 clp->cl_id_uniquifier);
2924                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2925                                 sizeof(setclientid.sc_netid), "tcp");
2926                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2927                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2928                                 clp->cl_ipaddr, port >> 8, port & 255);
2929
2930                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2931                 if (status != -NFS4ERR_CLID_INUSE)
2932                         break;
2933                 if (signalled())
2934                         break;
2935                 if (loop++ & 1)
2936                         ssleep(clp->cl_lease_time + 1);
2937                 else
2938                         if (++clp->cl_id_uniquifier == 0)
2939                                 break;
2940         }
2941         return status;
2942 }
2943
2944 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2945 {
2946         struct nfs_fsinfo fsinfo;
2947         struct rpc_message msg = {
2948                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2949                 .rpc_argp = clp,
2950                 .rpc_resp = &fsinfo,
2951                 .rpc_cred = cred,
2952         };
2953         unsigned long now;
2954         int status;
2955
2956         now = jiffies;
2957         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2958         if (status == 0) {
2959                 spin_lock(&clp->cl_lock);
2960                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2961                 clp->cl_last_renewal = now;
2962                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2963                 spin_unlock(&clp->cl_lock);
2964         }
2965         return status;
2966 }
2967
2968 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2969 {
2970         long timeout;
2971         int err;
2972         do {
2973                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2974                 switch (err) {
2975                         case 0:
2976                                 return err;
2977                         case -NFS4ERR_RESOURCE:
2978                                 /* The IBM lawyers misread another document! */
2979                         case -NFS4ERR_DELAY:
2980                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2981                 }
2982         } while (err == 0);
2983         return err;
2984 }
2985
2986 struct nfs4_delegreturndata {
2987         struct nfs4_delegreturnargs args;
2988         struct nfs4_delegreturnres res;
2989         struct nfs_fh fh;
2990         nfs4_stateid stateid;
2991         struct rpc_cred *cred;
2992         unsigned long timestamp;
2993         struct nfs_fattr fattr;
2994         int rpc_status;
2995 };
2996
2997 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2998 {
2999         struct nfs4_delegreturndata *data = calldata;
3000         struct rpc_message msg = {
3001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3002                 .rpc_argp = &data->args,
3003                 .rpc_resp = &data->res,
3004                 .rpc_cred = data->cred,
3005         };
3006         nfs_fattr_init(data->res.fattr);
3007         rpc_call_setup(task, &msg, 0);
3008 }
3009
3010 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3011 {
3012         struct nfs4_delegreturndata *data = calldata;
3013         data->rpc_status = task->tk_status;
3014         if (data->rpc_status == 0)
3015                 renew_lease(data->res.server, data->timestamp);
3016 }
3017
3018 static void nfs4_delegreturn_release(void *calldata)
3019 {
3020         struct nfs4_delegreturndata *data = calldata;
3021
3022         put_rpccred(data->cred);
3023         kfree(calldata);
3024 }
3025
3026 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3027         .rpc_call_prepare = nfs4_delegreturn_prepare,
3028         .rpc_call_done = nfs4_delegreturn_done,
3029         .rpc_release = nfs4_delegreturn_release,
3030 };
3031
3032 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3033 {
3034         struct nfs4_delegreturndata *data;
3035         struct nfs_server *server = NFS_SERVER(inode);
3036         struct rpc_task *task;
3037         int status;
3038
3039         data = kmalloc(sizeof(*data), GFP_KERNEL);
3040         if (data == NULL)
3041                 return -ENOMEM;
3042         data->args.fhandle = &data->fh;
3043         data->args.stateid = &data->stateid;
3044         data->args.bitmask = server->attr_bitmask;
3045         nfs_copy_fh(&data->fh, NFS_FH(inode));
3046         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3047         data->res.fattr = &data->fattr;
3048         data->res.server = server;
3049         data->cred = get_rpccred(cred);
3050         data->timestamp = jiffies;
3051         data->rpc_status = 0;
3052
3053         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3054         if (IS_ERR(task))
3055                 return PTR_ERR(task);
3056         status = nfs4_wait_for_completion_rpc_task(task);
3057         if (status == 0) {
3058                 status = data->rpc_status;
3059                 if (status == 0)
3060                         nfs_post_op_update_inode(inode, &data->fattr);
3061         }
3062         rpc_release_task(task);
3063         return status;
3064 }
3065
3066 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3067 {
3068         struct nfs_server *server = NFS_SERVER(inode);
3069         struct nfs4_exception exception = { };
3070         int err;
3071         do {
3072                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3073                 switch (err) {
3074                         case -NFS4ERR_STALE_STATEID:
3075                         case -NFS4ERR_EXPIRED:
3076                                 nfs4_schedule_state_recovery(server->nfs_client);
3077                         case 0:
3078                                 return 0;
3079                 }
3080                 err = nfs4_handle_exception(server, err, &exception);
3081         } while (exception.retry);
3082         return err;
3083 }
3084
3085 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3086 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3087
3088 /*
3089  * sleep, with exponential backoff, and retry the LOCK operation.
3090  */
3091 static unsigned long
3092 nfs4_set_lock_task_retry(unsigned long timeout)
3093 {
3094         schedule_timeout_interruptible(timeout);
3095         timeout <<= 1;
3096         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3097                 return NFS4_LOCK_MAXTIMEOUT;
3098         return timeout;
3099 }
3100
3101 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3102 {
3103         struct inode *inode = state->inode;
3104         struct nfs_server *server = NFS_SERVER(inode);
3105         struct nfs_client *clp = server->nfs_client;
3106         struct nfs_lockt_args arg = {
3107                 .fh = NFS_FH(inode),
3108                 .fl = request,
3109         };
3110         struct nfs_lockt_res res = {
3111                 .denied = request,
3112         };
3113         struct rpc_message msg = {
3114                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3115                 .rpc_argp       = &arg,
3116                 .rpc_resp       = &res,
3117                 .rpc_cred       = state->owner->so_cred,
3118         };
3119         struct nfs4_lock_state *lsp;
3120         int status;
3121
3122         down_read(&clp->cl_sem);
3123         arg.lock_owner.clientid = clp->cl_clientid;
3124         status = nfs4_set_lock_state(state, request);
3125         if (status != 0)
3126                 goto out;
3127         lsp = request->fl_u.nfs4_fl.owner;
3128         arg.lock_owner.id = lsp->ls_id;
3129         status = rpc_call_sync(server->client, &msg, 0);
3130         switch (status) {
3131                 case 0:
3132                         request->fl_type = F_UNLCK;
3133                         break;
3134                 case -NFS4ERR_DENIED:
3135                         status = 0;
3136         }
3137 out:
3138         up_read(&clp->cl_sem);
3139         return status;
3140 }
3141
3142 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3143 {
3144         struct nfs4_exception exception = { };
3145         int err;
3146
3147         do {
3148                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3149                                 _nfs4_proc_getlk(state, cmd, request),
3150                                 &exception);
3151         } while (exception.retry);
3152         return err;
3153 }
3154
3155 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3156 {
3157         int res = 0;
3158         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3159                 case FL_POSIX:
3160                         res = posix_lock_file_wait(file, fl);
3161                         break;
3162                 case FL_FLOCK:
3163                         res = flock_lock_file_wait(file, fl);
3164                         break;
3165                 default:
3166                         BUG();
3167         }
3168         return res;
3169 }
3170
3171 struct nfs4_unlockdata {
3172         struct nfs_locku_args arg;
3173         struct nfs_locku_res res;
3174         struct nfs4_lock_state *lsp;
3175         struct nfs_open_context *ctx;
3176         struct file_lock fl;
3177         const struct nfs_server *server;
3178         unsigned long timestamp;
3179 };
3180
3181 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3182                 struct nfs_open_context *ctx,
3183                 struct nfs4_lock_state *lsp,
3184                 struct nfs_seqid *seqid)
3185 {
3186         struct nfs4_unlockdata *p;
3187         struct inode *inode = lsp->ls_state->inode;
3188
3189         p = kmalloc(sizeof(*p), GFP_KERNEL);
3190         if (p == NULL)
3191                 return NULL;
3192         p->arg.fh = NFS_FH(inode);
3193         p->arg.fl = &p->fl;
3194         p->arg.seqid = seqid;
3195         p->arg.stateid = &lsp->ls_stateid;
3196         p->lsp = lsp;
3197         atomic_inc(&lsp->ls_count);
3198         /* Ensure we don't close file until we're done freeing locks! */
3199         p->ctx = get_nfs_open_context(ctx);
3200         memcpy(&p->fl, fl, sizeof(p->fl));
3201         p->server = NFS_SERVER(inode);
3202         return p;
3203 }
3204
3205 static void nfs4_locku_release_calldata(void *data)
3206 {
3207         struct nfs4_unlockdata *calldata = data;
3208         nfs_free_seqid(calldata->arg.seqid);
3209         nfs4_put_lock_state(calldata->lsp);
3210         put_nfs_open_context(calldata->ctx);
3211         kfree(calldata);
3212 }
3213
3214 static void nfs4_locku_done(struct rpc_task *task, void *data)
3215 {
3216         struct nfs4_unlockdata *calldata = data;
3217
3218         if (RPC_ASSASSINATED(task))
3219                 return;
3220         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3221         switch (task->tk_status) {
3222                 case 0:
3223                         memcpy(calldata->lsp->ls_stateid.data,
3224                                         calldata->res.stateid.data,
3225                                         sizeof(calldata->lsp->ls_stateid.data));
3226                         renew_lease(calldata->server, calldata->timestamp);
3227                         break;
3228                 case -NFS4ERR_STALE_STATEID:
3229                 case -NFS4ERR_EXPIRED:
3230                         nfs4_schedule_state_recovery(calldata->server->nfs_client);
3231                         break;
3232                 default:
3233                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3234                                 rpc_restart_call(task);
3235                         }
3236         }
3237 }
3238
3239 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3240 {
3241         struct nfs4_unlockdata *calldata = data;
3242         struct rpc_message msg = {
3243                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3244                 .rpc_argp       = &calldata->arg,
3245                 .rpc_resp       = &calldata->res,
3246                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3247         };
3248
3249         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3250                 return;
3251         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3252                 /* Note: exit _without_ running nfs4_locku_done */
3253                 task->tk_action = NULL;
3254                 return;
3255         }
3256         calldata->timestamp = jiffies;
3257         rpc_call_setup(task, &msg, 0);
3258 }
3259
3260 static const struct rpc_call_ops nfs4_locku_ops = {
3261         .rpc_call_prepare = nfs4_locku_prepare,
3262         .rpc_call_done = nfs4_locku_done,
3263         .rpc_release = nfs4_locku_release_calldata,
3264 };
3265
3266 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3267                 struct nfs_open_context *ctx,
3268                 struct nfs4_lock_state *lsp,
3269                 struct nfs_seqid *seqid)
3270 {
3271         struct nfs4_unlockdata *data;
3272
3273         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3274         if (data == NULL) {
3275                 nfs_free_seqid(seqid);
3276                 return ERR_PTR(-ENOMEM);
3277         }
3278
3279         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3280 }
3281
3282 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3283 {
3284         struct nfs_seqid *seqid;
3285         struct nfs4_lock_state *lsp;
3286         struct rpc_task *task;
3287         int status = 0;
3288
3289         status = nfs4_set_lock_state(state, request);
3290         /* Unlock _before_ we do the RPC call */
3291         request->fl_flags |= FL_EXISTS;
3292         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3293                 goto out;
3294         if (status != 0)
3295                 goto out;
3296         /* Is this a delegated lock? */
3297         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3298                 goto out;
3299         lsp = request->fl_u.nfs4_fl.owner;
3300         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3301         status = -ENOMEM;
3302         if (seqid == NULL)
3303                 goto out;
3304         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3305         status = PTR_ERR(task);
3306         if (IS_ERR(task))
3307                 goto out;
3308         status = nfs4_wait_for_completion_rpc_task(task);
3309         rpc_release_task(task);
3310 out:
3311         return status;
3312 }
3313
3314 struct nfs4_lockdata {
3315         struct nfs_lock_args arg;
3316         struct nfs_lock_res res;
3317         struct nfs4_lock_state *lsp;
3318         struct nfs_open_context *ctx;
3319         struct file_lock fl;
3320         unsigned long timestamp;
3321         int rpc_status;
3322         int cancelled;
3323 };
3324
3325 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3326                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3327 {
3328         struct nfs4_lockdata *p;
3329         struct inode *inode = lsp->ls_state->inode;
3330         struct nfs_server *server = NFS_SERVER(inode);
3331
3332         p = kzalloc(sizeof(*p), GFP_KERNEL);
3333         if (p == NULL)
3334                 return NULL;
3335
3336         p->arg.fh = NFS_FH(inode);
3337         p->arg.fl = &p->fl;
3338         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3339         if (p->arg.lock_seqid == NULL)
3340                 goto out_free;
3341         p->arg.lock_stateid = &lsp->ls_stateid;
3342         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3343         p->arg.lock_owner.id = lsp->ls_id;
3344         p->lsp = lsp;
3345         atomic_inc(&lsp->ls_count);
3346         p->ctx = get_nfs_open_context(ctx);
3347         memcpy(&p->fl, fl, sizeof(p->fl));
3348         return p;
3349 out_free:
3350         kfree(p);
3351         return NULL;
3352 }
3353
3354 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3355 {
3356         struct nfs4_lockdata *data = calldata;
3357         struct nfs4_state *state = data->lsp->ls_state;
3358         struct nfs4_state_owner *sp = state->owner;
3359         struct rpc_message msg = {
3360                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3361                 .rpc_argp = &data->arg,
3362                 .rpc_resp = &data->res,
3363                 .rpc_cred = sp->so_cred,
3364         };
3365
3366         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3367                 return;
3368         dprintk("%s: begin!\n", __FUNCTION__);
3369         /* Do we need to do an open_to_lock_owner? */
3370         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3371                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3372                 if (data->arg.open_seqid == NULL) {
3373                         data->rpc_status = -ENOMEM;
3374                         task->tk_action = NULL;
3375                         goto out;
3376                 }
3377                 data->arg.open_stateid = &state->stateid;
3378                 data->arg.new_lock_owner = 1;
3379         }
3380         data->timestamp = jiffies;
3381         rpc_call_setup(task, &msg, 0);
3382 out:
3383         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3384 }
3385
3386 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3387 {
3388         struct nfs4_lockdata *data = calldata;
3389
3390         dprintk("%s: begin!\n", __FUNCTION__);
3391
3392         data->rpc_status = task->tk_status;
3393         if (RPC_ASSASSINATED(task))
3394                 goto out;
3395         if (data->arg.new_lock_owner != 0) {
3396                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3397                 if (data->rpc_status == 0)
3398                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3399                 else
3400                         goto out;
3401         }
3402         if (data->rpc_status == 0) {
3403                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3404                                         sizeof(data->lsp->ls_stateid.data));
3405                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3406                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3407         }
3408         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3409 out:
3410         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3411 }
3412
3413 static void nfs4_lock_release(void *calldata)
3414 {
3415         struct nfs4_lockdata *data = calldata;
3416
3417         dprintk("%s: begin!\n", __FUNCTION__);
3418         if (data->arg.open_seqid != NULL)
3419                 nfs_free_seqid(data->arg.open_seqid);
3420         if (data->cancelled != 0) {
3421                 struct rpc_task *task;
3422                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3423                                 data->arg.lock_seqid);
3424                 if (!IS_ERR(task))
3425                         rpc_release_task(task);
3426                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3427         } else
3428                 nfs_free_seqid(data->arg.lock_seqid);
3429         nfs4_put_lock_state(data->lsp);
3430         put_nfs_open_context(data->ctx);
3431         kfree(data);
3432         dprintk("%s: done!\n", __FUNCTION__);
3433 }
3434
3435 static const struct rpc_call_ops nfs4_lock_ops = {
3436         .rpc_call_prepare = nfs4_lock_prepare,
3437         .rpc_call_done = nfs4_lock_done,
3438         .rpc_release = nfs4_lock_release,
3439 };
3440
3441 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3442 {
3443         struct nfs4_lockdata *data;
3444         struct rpc_task *task;
3445         int ret;
3446
3447         dprintk("%s: begin!\n", __FUNCTION__);
3448         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3449                         fl->fl_u.nfs4_fl.owner);
3450         if (data == NULL)
3451                 return -ENOMEM;
3452         if (IS_SETLKW(cmd))
3453                 data->arg.block = 1;
3454         if (reclaim != 0)
3455                 data->arg.reclaim = 1;
3456         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3457                         &nfs4_lock_ops, data);
3458         if (IS_ERR(task))
3459                 return PTR_ERR(task);
3460         ret = nfs4_wait_for_completion_rpc_task(task);
3461         if (ret == 0) {
3462                 ret = data->rpc_status;
3463                 if (ret == -NFS4ERR_DENIED)
3464                         ret = -EAGAIN;
3465         } else
3466                 data->cancelled = 1;
3467         rpc_release_task(task);
3468         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3469         return ret;
3470 }
3471
3472 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3473 {
3474         struct nfs_server *server = NFS_SERVER(state->inode);
3475         struct nfs4_exception exception = { };
3476         int err;
3477
3478         do {
3479                 /* Cache the lock if possible... */
3480                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3481                         return 0;
3482                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3483                 if (err != -NFS4ERR_DELAY)
3484                         break;
3485                 nfs4_handle_exception(server, err, &exception);
3486         } while (exception.retry);
3487         return err;
3488 }
3489
3490 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3491 {
3492         struct nfs_server *server = NFS_SERVER(state->inode);
3493         struct nfs4_exception exception = { };
3494         int err;
3495
3496         err = nfs4_set_lock_state(state, request);
3497         if (err != 0)
3498                 return err;
3499         do {
3500                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3501                         return 0;
3502                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3503                 if (err != -NFS4ERR_DELAY)
3504                         break;
3505                 nfs4_handle_exception(server, err, &exception);
3506         } while (exception.retry);
3507         return err;
3508 }
3509
3510 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3511 {
3512         struct nfs_client *clp = state->owner->so_client;
3513         unsigned char fl_flags = request->fl_flags;
3514         int status;
3515
3516         /* Is this a delegated open? */
3517         status = nfs4_set_lock_state(state, request);
3518         if (status != 0)
3519                 goto out;
3520         request->fl_flags |= FL_ACCESS;
3521         status = do_vfs_lock(request->fl_file, request);
3522         if (status < 0)
3523                 goto out;
3524         down_read(&clp->cl_sem);
3525         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3526                 struct nfs_inode *nfsi = NFS_I(state->inode);
3527                 /* Yes: cache locks! */
3528                 down_read(&nfsi->rwsem);
3529                 /* ...but avoid races with delegation recall... */
3530                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3531                         request->fl_flags = fl_flags & ~FL_SLEEP;
3532                         status = do_vfs_lock(request->fl_file, request);
3533                         up_read(&nfsi->rwsem);
3534                         goto out_unlock;
3535                 }
3536                 up_read(&nfsi->rwsem);
3537         }
3538         status = _nfs4_do_setlk(state, cmd, request, 0);
3539         if (status != 0)
3540                 goto out_unlock;
3541         /* Note: we always want to sleep here! */
3542         request->fl_flags = fl_flags | FL_SLEEP;
3543         if (do_vfs_lock(request->fl_file, request) < 0)
3544                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3545 out_unlock:
3546         up_read(&clp->cl_sem);
3547 out:
3548         request->fl_flags = fl_flags;
3549         return status;
3550 }
3551
3552 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3553 {
3554         struct nfs4_exception exception = { };
3555         int err;
3556
3557         do {
3558                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3559                                 _nfs4_proc_setlk(state, cmd, request),
3560                                 &exception);
3561         } while (exception.retry);
3562         return err;
3563 }
3564
3565 static int
3566 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3567 {
3568         struct nfs_open_context *ctx;
3569         struct nfs4_state *state;
3570         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3571         int status;
3572
3573         /* verify open state */
3574         ctx = (struct nfs_open_context *)filp->private_data;
3575         state = ctx->state;
3576
3577         if (request->fl_start < 0 || request->fl_end < 0)
3578                 return -EINVAL;
3579
3580         if (IS_GETLK(cmd))
3581                 return nfs4_proc_getlk(state, F_GETLK, request);
3582
3583         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3584                 return -EINVAL;
3585
3586         if (request->fl_type == F_UNLCK)
3587                 return nfs4_proc_unlck(state, cmd, request);
3588
3589         do {
3590                 status = nfs4_proc_setlk(state, cmd, request);
3591                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3592                         break;
3593                 timeout = nfs4_set_lock_task_retry(timeout);
3594                 status = -ERESTARTSYS;
3595                 if (signalled())
3596                         break;
3597         } while(status < 0);
3598         return status;
3599 }
3600
3601 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3602 {
3603         struct nfs_server *server = NFS_SERVER(state->inode);
3604         struct nfs4_exception exception = { };
3605         int err;
3606
3607         err = nfs4_set_lock_state(state, fl);
3608         if (err != 0)
3609                 goto out;
3610         do {
3611                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3612                 if (err != -NFS4ERR_DELAY)
3613                         break;
3614                 err = nfs4_handle_exception(server, err, &exception);
3615         } while (exception.retry);
3616 out:
3617         return err;
3618 }
3619
3620 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3621
3622 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3623                 size_t buflen, int flags)
3624 {
3625         struct inode *inode = dentry->d_inode;
3626
3627         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3628                 return -EOPNOTSUPP;
3629
3630         if (!S_ISREG(inode->i_mode) &&
3631             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3632                 return -EPERM;
3633
3634         return nfs4_proc_set_acl(inode, buf, buflen);
3635 }
3636
3637 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3638  * and that's what we'll do for e.g. user attributes that haven't been set.
3639  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3640  * attributes in kernel-managed attribute namespaces. */
3641 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3642                 size_t buflen)
3643 {
3644         struct inode *inode = dentry->d_inode;
3645
3646         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3647                 return -EOPNOTSUPP;
3648
3649         return nfs4_proc_get_acl(inode, buf, buflen);
3650 }
3651
3652 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3653 {
3654         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3655
3656         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3657                 return 0;
3658         if (buf && buflen < len)
3659                 return -ERANGE;
3660         if (buf)
3661                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3662         return len;
3663 }
3664
3665 int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
3666                 struct nfs4_fs_locations *fs_locations, struct page *page)
3667 {
3668         struct nfs_server *server = NFS_SERVER(dir);
3669         u32 bitmask[2] = {
3670                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3671                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3672         };
3673         struct nfs4_fs_locations_arg args = {
3674                 .dir_fh = NFS_FH(dir),
3675                 .name = &dentry->d_name,
3676                 .page = page,
3677                 .bitmask = bitmask,
3678         };
3679         struct rpc_message msg = {
3680                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3681                 .rpc_argp = &args,
3682                 .rpc_resp = fs_locations,
3683         };
3684         int status;
3685
3686         dprintk("%s: start\n", __FUNCTION__);
3687         fs_locations->fattr.valid = 0;
3688         fs_locations->server = server;
3689         fs_locations->nlocations = 0;
3690         status = rpc_call_sync(server->client, &msg, 0);
3691         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3692         return status;
3693 }
3694
3695 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3696         .recover_open   = nfs4_open_reclaim,
3697         .recover_lock   = nfs4_lock_reclaim,
3698 };
3699
3700 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3701         .recover_open   = nfs4_open_expired,
3702         .recover_lock   = nfs4_lock_expired,
3703 };
3704
3705 static struct inode_operations nfs4_file_inode_operations = {
3706         .permission     = nfs_permission,
3707         .getattr        = nfs_getattr,
3708         .setattr        = nfs_setattr,
3709         .getxattr       = nfs4_getxattr,
3710         .setxattr       = nfs4_setxattr,
3711         .listxattr      = nfs4_listxattr,
3712 };
3713
3714 const struct nfs_rpc_ops nfs_v4_clientops = {
3715         .version        = 4,                    /* protocol version */
3716         .dentry_ops     = &nfs4_dentry_operations,
3717         .dir_inode_ops  = &nfs4_dir_inode_operations,
3718         .file_inode_ops = &nfs4_file_inode_operations,
3719         .getroot        = nfs4_proc_get_root,
3720         .getattr        = nfs4_proc_getattr,
3721         .setattr        = nfs4_proc_setattr,
3722         .lookupfh       = nfs4_proc_lookupfh,
3723         .lookup         = nfs4_proc_lookup,
3724         .access         = nfs4_proc_access,
3725         .readlink       = nfs4_proc_readlink,
3726         .read           = nfs4_proc_read,
3727         .write          = nfs4_proc_write,
3728         .commit         = nfs4_proc_commit,
3729         .create         = nfs4_proc_create,
3730         .remove         = nfs4_proc_remove,
3731         .unlink_setup   = nfs4_proc_unlink_setup,
3732         .unlink_done    = nfs4_proc_unlink_done,
3733         .rename         = nfs4_proc_rename,
3734         .link           = nfs4_proc_link,
3735         .symlink        = nfs4_proc_symlink,
3736         .mkdir          = nfs4_proc_mkdir,
3737         .rmdir          = nfs4_proc_remove,
3738         .readdir        = nfs4_proc_readdir,
3739         .mknod          = nfs4_proc_mknod,
3740         .statfs         = nfs4_proc_statfs,
3741         .fsinfo         = nfs4_proc_fsinfo,
3742         .pathconf       = nfs4_proc_pathconf,
3743         .set_capabilities = nfs4_server_capabilities,
3744         .decode_dirent  = nfs4_decode_dirent,
3745         .read_setup     = nfs4_proc_read_setup,
3746         .read_done      = nfs4_read_done,
3747         .write_setup    = nfs4_proc_write_setup,
3748         .write_done     = nfs4_write_done,
3749         .commit_setup   = nfs4_proc_commit_setup,
3750         .commit_done    = nfs4_commit_done,
3751         .file_open      = nfs_open,
3752         .file_release   = nfs_release,
3753         .lock           = nfs4_proc_lock,
3754         .clear_acl_cache = nfs4_zap_acl_attr,
3755 };
3756
3757 /*
3758  * Local variables:
3759  *  c-basic-offset: 8
3760  * End:
3761  */