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     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_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         int ret;
 797
 798         for (;;) {
 799                 ret = nfs4_wait_clnt_recover(server->client, clp);
 800                 if (ret != 0)
 801                         return ret;
 802                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 803                         break;
 804                 nfs4_schedule_state_recovery(clp);
 805         }
 806         return 0;
 807 }
 808
 809 /*
 810  * OPEN_EXPIRED:
 811  *      reclaim state on the server after a network partition.
 812  *      Assumes caller holds the appropriate lock
 813  */
 814 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 815 {
 816         struct inode *inode = state->inode;
 817         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 818         struct nfs4_opendata *opendata;
 819         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 820         int ret;
 821
 822         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 823                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 824                 if (ret < 0)
 825                         return ret;
 826                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 827                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 828                 return 0;
 829         }
 830         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 831         if (opendata == NULL)
 832                 return -ENOMEM;
 833         ret = nfs4_open_recover(opendata, state);
 834         if (ret == -ESTALE) {
 835                 /* Invalidate the state owner so we don't ever use it again */
 836                 nfs4_drop_state_owner(sp);
 837                 d_drop(dentry);
 838         }
 839         nfs4_opendata_free(opendata);
 840         return ret;
 841 }
 842
 843 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 844 {
 845         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 846         struct nfs4_exception exception = { };
 847         int err;
 848
 849         do {
 850                 err = _nfs4_open_expired(sp, state, dentry);
 851                 if (err == -NFS4ERR_DELAY)
 852                         nfs4_handle_exception(server, err, &exception);
 853         } while (exception.retry);
 854         return err;
 855 }
 856
 857 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 858 {
 859         struct nfs_open_context *ctx;
 860         int ret;
 861
 862         ctx = nfs4_state_find_open_context(state);
 863         if (IS_ERR(ctx))
 864                 return PTR_ERR(ctx);
 865         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 866         put_nfs_open_context(ctx);
 867         return ret;
 868 }
 869
 870 /*
 871  * Returns a referenced nfs4_state if there is an open delegation on the file
 872  */
 873 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 874 {
 875         struct nfs_delegation *delegation;
 876         struct nfs_server *server = NFS_SERVER(inode);
 877         struct nfs_client *clp = server->nfs_client;
 878         struct nfs_inode *nfsi = NFS_I(inode);
 879         struct nfs4_state_owner *sp = NULL;
 880         struct nfs4_state *state = NULL;
 881         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 882         int err;
 883
 884         err = -ENOMEM;
 885         if (!(sp = nfs4_get_state_owner(server, cred))) {
 886                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 887                 return err;
 888         }
 889         err = nfs4_recover_expired_lease(server);
 890         if (err != 0)
 891                 goto out_put_state_owner;
 892         /* Protect against reboot recovery - NOTE ORDER! */
 893         down_read(&clp->cl_sem);
 894         /* Protect against delegation recall */
 895         down_read(&nfsi->rwsem);
 896         delegation = NFS_I(inode)->delegation;
 897         err = -ENOENT;
 898         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 899                 goto out_err;
 900         err = -ENOMEM;
 901         state = nfs4_get_open_state(inode, sp);
 902         if (state == NULL)
 903                 goto out_err;
 904
 905         err = -ENOENT;
 906         if ((state->state & open_flags) == open_flags) {
 907                 spin_lock(&inode->i_lock);
 908                 update_open_stateflags(state, open_flags);
 909                 spin_unlock(&inode->i_lock);
 910                 goto out_ok;
 911         } else if (state->state != 0)
 912                 goto out_put_open_state;
 913
 914         lock_kernel();
 915         err = _nfs4_do_access(inode, cred, open_flags);
 916         unlock_kernel();
 917         if (err != 0)
 918                 goto out_put_open_state;
 919         set_bit(NFS_DELEGATED_STATE, &state->flags);
 920         update_open_stateid(state, &delegation->stateid, open_flags);
 921 out_ok:
 922         nfs4_put_state_owner(sp);
 923         up_read(&nfsi->rwsem);
 924         up_read(&clp->cl_sem);
 925         *res = state;
 926         return 0;
 927 out_put_open_state:
 928         nfs4_put_open_state(state);
 929 out_err:
 930         up_read(&nfsi->rwsem);
 931         up_read(&clp->cl_sem);
 932         if (err != -EACCES)
 933                 nfs_inode_return_delegation(inode);
 934 out_put_state_owner:
 935         nfs4_put_state_owner(sp);
 936         return err;
 937 }
 938
 939 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 940 {
 941         struct nfs4_exception exception = { };
 942         struct nfs4_state *res = ERR_PTR(-EIO);
 943         int err;
 944
 945         do {
 946                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 947                 if (err == 0)
 948                         break;
 949                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 950                                         err, &exception));
 951         } while (exception.retry);
 952         return res;
 953 }
 954
 955 /*
 956  * Returns a referenced nfs4_state
 957  */
 958 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 959 {
 960         struct nfs4_state_owner  *sp;
 961         struct nfs4_state     *state = NULL;
 962         struct nfs_server       *server = NFS_SERVER(dir);
 963         struct nfs_client *clp = server->nfs_client;
 964         struct nfs4_opendata *opendata;
 965         int                     status;
 966
 967         /* Protect against reboot recovery conflicts */
 968         status = -ENOMEM;
 969         if (!(sp = nfs4_get_state_owner(server, cred))) {
 970                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 971                 goto out_err;
 972         }
 973         status = nfs4_recover_expired_lease(server);
 974         if (status != 0)
 975                 goto err_put_state_owner;
 976         down_read(&clp->cl_sem);
 977         status = -ENOMEM;
 978         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 979         if (opendata == NULL)
 980                 goto err_release_rwsem;
 981
 982         status = _nfs4_proc_open(opendata);
 983         if (status != 0)
 984                 goto err_opendata_free;
 985
 986         status = -ENOMEM;
 987         state = nfs4_opendata_to_nfs4_state(opendata);
 988         if (state == NULL)
 989                 goto err_opendata_free;
 990         if (opendata->o_res.delegation_type != 0)
 991                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 992         nfs4_opendata_free(opendata);
 993         nfs4_put_state_owner(sp);
 994         up_read(&clp->cl_sem);
 995         *res = state;
 996         return 0;
 997 err_opendata_free:
 998         nfs4_opendata_free(opendata);
 999 err_release_rwsem:
1000         up_read(&clp->cl_sem);
1001 err_put_state_owner:
1002         nfs4_put_state_owner(sp);
1003 out_err:
1004         *res = NULL;
1005         return status;
1006 }
1007
1008
1009 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1010 {
1011         struct nfs4_exception exception = { };
1012         struct nfs4_state *res;
1013         int status;
1014
1015         do {
1016                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1017                 if (status == 0)
1018                         break;
1019                 /* NOTE: BAD_SEQID means the server and client disagree about the
1020                  * book-keeping w.r.t. state-changing operations
1021                  * (OPEN/CLOSE/LOCK/LOCKU...)
1022                  * It is actually a sign of a bug on the client or on the server.
1023                  *
1024                  * If we receive a BAD_SEQID error in the particular case of
1025                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1026                  * have unhashed the old state_owner for us, and that we can
1027                  * therefore safely retry using a new one. We should still warn
1028                  * the user though...
1029                  */
1030                 if (status == -NFS4ERR_BAD_SEQID) {
1031                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1032                         exception.retry = 1;
1033                         continue;
1034                 }
1035                 /*
1036                  * BAD_STATEID on OPEN means that the server cancelled our
1037                  * state before it received the OPEN_CONFIRM.
1038                  * Recover by retrying the request as per the discussion
1039                  * on Page 181 of RFC3530.
1040                  */
1041                 if (status == -NFS4ERR_BAD_STATEID) {
1042                         exception.retry = 1;
1043                         continue;
1044                 }
1045                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1046                                         status, &exception));
1047         } while (exception.retry);
1048         return res;
1049 }
1050
1051 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1052                 struct iattr *sattr, struct nfs4_state *state)
1053 {
1054         struct nfs_server *server = NFS_SERVER(inode);
1055         struct nfs_setattrargs  arg = {
1056                 .fh             = NFS_FH(inode),
1057                 .iap            = sattr,
1058                 .server         = server,
1059                 .bitmask = server->attr_bitmask,
1060         };
1061         struct nfs_setattrres  res = {
1062                 .fattr          = fattr,
1063                 .server         = server,
1064         };
1065         struct rpc_message msg = {
1066                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1067                 .rpc_argp       = &arg,
1068                 .rpc_resp       = &res,
1069         };
1070         unsigned long timestamp = jiffies;
1071         int status;
1072
1073         nfs_fattr_init(fattr);
1074
1075         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1076                 /* Use that stateid */
1077         } else if (state != NULL) {
1078                 msg.rpc_cred = state->owner->so_cred;
1079                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1080         } else
1081                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1082
1083         status = rpc_call_sync(server->client, &msg, 0);
1084         if (status == 0 && state != NULL)
1085                 renew_lease(server, timestamp);
1086         return status;
1087 }
1088
1089 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1090                 struct iattr *sattr, struct nfs4_state *state)
1091 {
1092         struct nfs_server *server = NFS_SERVER(inode);
1093         struct nfs4_exception exception = { };
1094         int err;
1095         do {
1096                 err = nfs4_handle_exception(server,
1097                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1098                                 &exception);
1099         } while (exception.retry);
1100         return err;
1101 }
1102
1103 struct nfs4_closedata {
1104         struct inode *inode;
1105         struct nfs4_state *state;
1106         struct nfs_closeargs arg;
1107         struct nfs_closeres res;
1108         struct nfs_fattr fattr;
1109         unsigned long timestamp;
1110 };
1111
1112 static void nfs4_free_closedata(void *data)
1113 {
1114         struct nfs4_closedata *calldata = data;
1115         struct nfs4_state_owner *sp = calldata->state->owner;
1116
1117         nfs4_put_open_state(calldata->state);
1118         nfs_free_seqid(calldata->arg.seqid);
1119         nfs4_put_state_owner(sp);
1120         kfree(calldata);
1121 }
1122
1123 static void nfs4_close_done(struct rpc_task *task, void *data)
1124 {
1125         struct nfs4_closedata *calldata = data;
1126         struct nfs4_state *state = calldata->state;
1127         struct nfs_server *server = NFS_SERVER(calldata->inode);
1128
1129         if (RPC_ASSASSINATED(task))
1130                 return;
1131         /* hmm. we are done with the inode, and in the process of freeing
1132          * the state_owner. we keep this around to process errors
1133          */
1134         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1135         switch (task->tk_status) {
1136                 case 0:
1137                         memcpy(&state->stateid, &calldata->res.stateid,
1138                                         sizeof(state->stateid));
1139                         renew_lease(server, calldata->timestamp);
1140                         break;
1141                 case -NFS4ERR_STALE_STATEID:
1142                 case -NFS4ERR_EXPIRED:
1143                         nfs4_schedule_state_recovery(server->nfs_client);
1144                         break;
1145                 default:
1146                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1147                                 rpc_restart_call(task);
1148                                 return;
1149                         }
1150         }
1151         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1152 }
1153
1154 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1155 {
1156         struct nfs4_closedata *calldata = data;
1157         struct nfs4_state *state = calldata->state;
1158         struct rpc_message msg = {
1159                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1160                 .rpc_argp = &calldata->arg,
1161                 .rpc_resp = &calldata->res,
1162                 .rpc_cred = state->owner->so_cred,
1163         };
1164         int mode = 0, old_mode;
1165
1166         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1167                 return;
1168         /* Recalculate the new open mode in case someone reopened the file
1169          * while we were waiting in line to be scheduled.
1170          */
1171         spin_lock(&state->owner->so_lock);
1172         spin_lock(&calldata->inode->i_lock);
1173         mode = old_mode = state->state;
1174         if (state->n_rdwr == 0) {
1175                 if (state->n_rdonly == 0)
1176                         mode &= ~FMODE_READ;
1177                 if (state->n_wronly == 0)
1178                         mode &= ~FMODE_WRITE;
1179         }
1180         nfs4_state_set_mode_locked(state, mode);
1181         spin_unlock(&calldata->inode->i_lock);
1182         spin_unlock(&state->owner->so_lock);
1183         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1184                 /* Note: exit _without_ calling nfs4_close_done */
1185                 task->tk_action = NULL;
1186                 return;
1187         }
1188         nfs_fattr_init(calldata->res.fattr);
1189         if (mode != 0)
1190                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1191         calldata->arg.open_flags = mode;
1192         calldata->timestamp = jiffies;
1193         rpc_call_setup(task, &msg, 0);
1194 }
1195
1196 static const struct rpc_call_ops nfs4_close_ops = {
1197         .rpc_call_prepare = nfs4_close_prepare,
1198         .rpc_call_done = nfs4_close_done,
1199         .rpc_release = nfs4_free_closedata,
1200 };
1201
1202 /*
1203  * It is possible for data to be read/written from a mem-mapped file
1204  * after the sys_close call (which hits the vfs layer as a flush).
1205  * This means that we can't safely call nfsv4 close on a file until
1206  * the inode is cleared. This in turn means that we are not good
1207  * NFSv4 citizens - we do not indicate to the server to update the file's
1208  * share state even when we are done with one of the three share
1209  * stateid's in the inode.
1210  *
1211  * NOTE: Caller must be holding the sp->so_owner semaphore!
1212  */
1213 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1214 {
1215         struct nfs_server *server = NFS_SERVER(inode);
1216         struct nfs4_closedata *calldata;
1217         int status = -ENOMEM;
1218
1219         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1220         if (calldata == NULL)
1221                 goto out;
1222         calldata->inode = inode;
1223         calldata->state = state;
1224         calldata->arg.fh = NFS_FH(inode);
1225         calldata->arg.stateid = &state->stateid;
1226         /* Serialization for the sequence id */
1227         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1228         if (calldata->arg.seqid == NULL)
1229                 goto out_free_calldata;
1230         calldata->arg.bitmask = server->attr_bitmask;
1231         calldata->res.fattr = &calldata->fattr;
1232         calldata->res.server = server;
1233
1234         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1235         if (status == 0)
1236                 goto out;
1237
1238         nfs_free_seqid(calldata->arg.seqid);
1239 out_free_calldata:
1240         kfree(calldata);
1241 out:
1242         return status;
1243 }
1244
1245 static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1246 {
1247         struct file *filp;
1248
1249         filp = lookup_instantiate_filp(nd, dentry, NULL);
1250         if (!IS_ERR(filp)) {
1251                 struct nfs_open_context *ctx;
1252                 ctx = (struct nfs_open_context *)filp->private_data;
1253                 ctx->state = state;
1254                 return 0;
1255         }
1256         nfs4_close_state(state, nd->intent.open.flags);
1257         return PTR_ERR(filp);
1258 }
1259
1260 struct dentry *
1261 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1262 {
1263         struct iattr attr;
1264         struct rpc_cred *cred;
1265         struct nfs4_state *state;
1266         struct dentry *res;
1267
1268         if (nd->flags & LOOKUP_CREATE) {
1269                 attr.ia_mode = nd->intent.open.create_mode;
1270                 attr.ia_valid = ATTR_MODE;
1271                 if (!IS_POSIXACL(dir))
1272                         attr.ia_mode &= ~current->fs->umask;
1273         } else {
1274                 attr.ia_valid = 0;
1275                 BUG_ON(nd->intent.open.flags & O_CREAT);
1276         }
1277
1278         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1279         if (IS_ERR(cred))
1280                 return (struct dentry *)cred;
1281         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1282         put_rpccred(cred);
1283         if (IS_ERR(state)) {
1284                 if (PTR_ERR(state) == -ENOENT)
1285                         d_add(dentry, NULL);
1286                 return (struct dentry *)state;
1287         }
1288         res = d_add_unique(dentry, igrab(state->inode));
1289         if (res != NULL)
1290                 dentry = res;
1291         nfs4_intent_set_file(nd, dentry, state);
1292         return res;
1293 }
1294
1295 int
1296 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1297 {
1298         struct rpc_cred *cred;
1299         struct nfs4_state *state;
1300
1301         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1302         if (IS_ERR(cred))
1303                 return PTR_ERR(cred);
1304         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1305         if (IS_ERR(state))
1306                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1307         put_rpccred(cred);
1308         if (IS_ERR(state)) {
1309                 switch (PTR_ERR(state)) {
1310                         case -EPERM:
1311                         case -EACCES:
1312                         case -EDQUOT:
1313                         case -ENOSPC:
1314                         case -EROFS:
1315                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1316                                 return 1;
1317                         case -ENOENT:
1318                                 if (dentry->d_inode == NULL)
1319                                         return 1;
1320                 }
1321                 goto out_drop;
1322         }
1323         if (state->inode == dentry->d_inode) {
1324                 nfs4_intent_set_file(nd, dentry, state);
1325                 return 1;
1326         }
1327         nfs4_close_state(state, openflags);
1328 out_drop:
1329         d_drop(dentry);
1330         return 0;
1331 }
1332
1333
1334 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1335 {
1336         struct nfs4_server_caps_res res = {};
1337         struct rpc_message msg = {
1338                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1339                 .rpc_argp = fhandle,
1340                 .rpc_resp = &res,
1341         };
1342         int status;
1343
1344         status = rpc_call_sync(server->client, &msg, 0);
1345         if (status == 0) {
1346                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1347                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1348                         server->caps |= NFS_CAP_ACLS;
1349                 if (res.has_links != 0)
1350                         server->caps |= NFS_CAP_HARDLINKS;
1351                 if (res.has_symlinks != 0)
1352                         server->caps |= NFS_CAP_SYMLINKS;
1353                 server->acl_bitmask = res.acl_bitmask;
1354         }
1355         return status;
1356 }
1357
1358 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1359 {
1360         struct nfs4_exception exception = { };
1361         int err;
1362         do {
1363                 err = nfs4_handle_exception(server,
1364                                 _nfs4_server_capabilities(server, fhandle),
1365                                 &exception);
1366         } while (exception.retry);
1367         return err;
1368 }
1369
1370 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1371                 struct nfs_fsinfo *info)
1372 {
1373         struct nfs4_lookup_root_arg args = {
1374                 .bitmask = nfs4_fattr_bitmap,
1375         };
1376         struct nfs4_lookup_res res = {
1377                 .server = server,
1378                 .fattr = info->fattr,
1379                 .fh = fhandle,
1380         };
1381         struct rpc_message msg = {
1382                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1383                 .rpc_argp = &args,
1384                 .rpc_resp = &res,
1385         };
1386         nfs_fattr_init(info->fattr);
1387         return rpc_call_sync(server->client, &msg, 0);
1388 }
1389
1390 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1391                 struct nfs_fsinfo *info)
1392 {
1393         struct nfs4_exception exception = { };
1394         int err;
1395         do {
1396                 err = nfs4_handle_exception(server,
1397                                 _nfs4_lookup_root(server, fhandle, info),
1398                                 &exception);
1399         } while (exception.retry);
1400         return err;
1401 }
1402
1403 /*
1404  * get the file handle for the "/" directory on the server
1405  */
1406 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1407                               struct nfs_fsinfo *info)
1408 {
1409         int status;
1410
1411         status = nfs4_lookup_root(server, fhandle, info);
1412         if (status == 0)
1413                 status = nfs4_server_capabilities(server, fhandle);
1414         if (status == 0)
1415                 status = nfs4_do_fsinfo(server, fhandle, info);
1416         return nfs4_map_errors(status);
1417 }
1418
1419 /*
1420  * Get locations and (maybe) other attributes of a referral.
1421  * Note that we'll actually follow the referral later when
1422  * we detect fsid mismatch in inode revalidation
1423  */
1424 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1425 {
1426         int status = -ENOMEM;
1427         struct page *page = NULL;
1428         struct nfs4_fs_locations *locations = NULL;
1429         struct dentry dentry = {};
1430
1431         page = alloc_page(GFP_KERNEL);
1432         if (page == NULL)
1433                 goto out;
1434         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1435         if (locations == NULL)
1436                 goto out;
1437
1438         dentry.d_name.name = name->name;
1439         dentry.d_name.len = name->len;
1440         status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1441         if (status != 0)
1442                 goto out;
1443         /* Make sure server returned a different fsid for the referral */
1444         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1445                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1446                 status = -EIO;
1447                 goto out;
1448         }
1449
1450         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1451         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1452         if (!fattr->mode)
1453                 fattr->mode = S_IFDIR;
1454         memset(fhandle, 0, sizeof(struct nfs_fh));
1455 out:
1456         if (page)
1457                 __free_page(page);
1458         if (locations)
1459                 kfree(locations);
1460         return status;
1461 }
1462
1463 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1464 {
1465         struct nfs4_getattr_arg args = {
1466                 .fh = fhandle,
1467                 .bitmask = server->attr_bitmask,
1468         };
1469         struct nfs4_getattr_res res = {
1470                 .fattr = fattr,
1471                 .server = server,
1472         };
1473         struct rpc_message msg = {
1474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1475                 .rpc_argp = &args,
1476                 .rpc_resp = &res,
1477         };
1478
1479         nfs_fattr_init(fattr);
1480         return rpc_call_sync(server->client, &msg, 0);
1481 }
1482
1483 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1484 {
1485         struct nfs4_exception exception = { };
1486         int err;
1487         do {
1488                 err = nfs4_handle_exception(server,
1489                                 _nfs4_proc_getattr(server, fhandle, fattr),
1490                                 &exception);
1491         } while (exception.retry);
1492         return err;
1493 }
1494
1495 /*
1496  * The file is not closed if it is opened due to the a request to change
1497  * the size of the file. The open call will not be needed once the
1498  * VFS layer lookup-intents are implemented.
1499  *
1500  * Close is called when the inode is destroyed.
1501  * If we haven't opened the file for O_WRONLY, we
1502  * need to in the size_change case to obtain a stateid.
1503  *
1504  * Got race?
1505  * Because OPEN is always done by name in nfsv4, it is
1506  * possible that we opened a different file by the same
1507  * name.  We can recognize this race condition, but we
1508  * can't do anything about it besides returning an error.
1509  *
1510  * This will be fixed with VFS changes (lookup-intent).
1511  */
1512 static int
1513 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1514                   struct iattr *sattr)
1515 {
1516         struct rpc_cred *cred;
1517         struct inode *inode = dentry->d_inode;
1518         struct nfs_open_context *ctx;
1519         struct nfs4_state *state = NULL;
1520         int status;
1521
1522         nfs_fattr_init(fattr);
1523
1524         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1525         if (IS_ERR(cred))
1526                 return PTR_ERR(cred);
1527
1528         /* Search for an existing open(O_WRITE) file */
1529         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1530         if (ctx != NULL)
1531                 state = ctx->state;
1532
1533         status = nfs4_do_setattr(inode, fattr, sattr, state);
1534         if (status == 0)
1535                 nfs_setattr_update_inode(inode, sattr);
1536         if (ctx != NULL)
1537                 put_nfs_open_context(ctx);
1538         put_rpccred(cred);
1539         return status;
1540 }
1541
1542 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1543                 struct qstr *name, struct nfs_fh *fhandle,
1544                 struct nfs_fattr *fattr)
1545 {
1546         int                    status;
1547         struct nfs4_lookup_arg args = {
1548                 .bitmask = server->attr_bitmask,
1549                 .dir_fh = dirfh,
1550                 .name = name,
1551         };
1552         struct nfs4_lookup_res res = {
1553                 .server = server,
1554                 .fattr = fattr,
1555                 .fh = fhandle,
1556         };
1557         struct rpc_message msg = {
1558                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1559                 .rpc_argp = &args,
1560                 .rpc_resp = &res,
1561         };
1562
1563         nfs_fattr_init(fattr);
1564
1565         dprintk("NFS call  lookupfh %s\n", name->name);
1566         status = rpc_call_sync(server->client, &msg, 0);
1567         dprintk("NFS reply lookupfh: %d\n", status);
1568         if (status == -NFS4ERR_MOVED)
1569                 status = -EREMOTE;
1570         return status;
1571 }
1572
1573 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1574                               struct qstr *name, struct nfs_fh *fhandle,
1575                               struct nfs_fattr *fattr)
1576 {
1577         struct nfs4_exception exception = { };
1578         int err;
1579         do {
1580                 err = nfs4_handle_exception(server,
1581                                 _nfs4_proc_lookupfh(server, dirfh, name,
1582                                                     fhandle, fattr),
1583                                 &exception);
1584         } while (exception.retry);
1585         return err;
1586 }
1587
1588 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1589                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1590 {
1591         int                    status;
1592         struct nfs_server *server = NFS_SERVER(dir);
1593         struct nfs4_lookup_arg args = {
1594                 .bitmask = server->attr_bitmask,
1595                 .dir_fh = NFS_FH(dir),
1596                 .name = name,
1597         };
1598         struct nfs4_lookup_res res = {
1599                 .server = server,
1600                 .fattr = fattr,
1601                 .fh = fhandle,
1602         };
1603         struct rpc_message msg = {
1604                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1605                 .rpc_argp = &args,
1606                 .rpc_resp = &res,
1607         };
1608
1609         nfs_fattr_init(fattr);
1610
1611         dprintk("NFS call  lookup %s\n", name->name);
1612         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1613         if (status == -NFS4ERR_MOVED)
1614                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1615         dprintk("NFS reply lookup: %d\n", status);
1616         return status;
1617 }
1618
1619 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1620 {
1621         struct nfs4_exception exception = { };
1622         int err;
1623         do {
1624                 err = nfs4_handle_exception(NFS_SERVER(dir),
1625                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1626                                 &exception);
1627         } while (exception.retry);
1628         return err;
1629 }
1630
1631 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1632 {
1633         struct nfs4_accessargs args = {
1634                 .fh = NFS_FH(inode),
1635         };
1636         struct nfs4_accessres res = { 0 };
1637         struct rpc_message msg = {
1638                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1639                 .rpc_argp = &args,
1640                 .rpc_resp = &res,
1641                 .rpc_cred = entry->cred,
1642         };
1643         int mode = entry->mask;
1644         int status;
1645
1646         /*
1647          * Determine which access bits we want to ask for...
1648          */
1649         if (mode & MAY_READ)
1650                 args.access |= NFS4_ACCESS_READ;
1651         if (S_ISDIR(inode->i_mode)) {
1652                 if (mode & MAY_WRITE)
1653                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1654                 if (mode & MAY_EXEC)
1655                         args.access |= NFS4_ACCESS_LOOKUP;
1656         } else {
1657                 if (mode & MAY_WRITE)
1658                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1659                 if (mode & MAY_EXEC)
1660                         args.access |= NFS4_ACCESS_EXECUTE;
1661         }
1662         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1663         if (!status) {
1664                 entry->mask = 0;
1665                 if (res.access & NFS4_ACCESS_READ)
1666                         entry->mask |= MAY_READ;
1667                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1668                         entry->mask |= MAY_WRITE;
1669                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1670                         entry->mask |= MAY_EXEC;
1671         }
1672         return status;
1673 }
1674
1675 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1676 {
1677         struct nfs4_exception exception = { };
1678         int err;
1679         do {
1680                 err = nfs4_handle_exception(NFS_SERVER(inode),
1681                                 _nfs4_proc_access(inode, entry),
1682                                 &exception);
1683         } while (exception.retry);
1684         return err;
1685 }
1686
1687 /*
1688  * TODO: For the time being, we don't try to get any attributes
1689  * along with any of the zero-copy operations READ, READDIR,
1690  * READLINK, WRITE.
1691  *
1692  * In the case of the first three, we want to put the GETATTR
1693  * after the read-type operation -- this is because it is hard
1694  * to predict the length of a GETATTR response in v4, and thus
1695  * align the READ data correctly.  This means that the GETATTR
1696  * may end up partially falling into the page cache, and we should
1697  * shift it into the 'tail' of the xdr_buf before processing.
1698  * To do this efficiently, we need to know the total length
1699  * of data received, which doesn't seem to be available outside
1700  * of the RPC layer.
1701  *
1702  * In the case of WRITE, we also want to put the GETATTR after
1703  * the operation -- in this case because we want to make sure
1704  * we get the post-operation mtime and size.  This means that
1705  * we can't use xdr_encode_pages() as written: we need a variant
1706  * of it which would leave room in the 'tail' iovec.
1707  *
1708  * Both of these changes to the XDR layer would in fact be quite
1709  * minor, but I decided to leave them for a subsequent patch.
1710  */
1711 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1712                 unsigned int pgbase, unsigned int pglen)
1713 {
1714         struct nfs4_readlink args = {
1715                 .fh       = NFS_FH(inode),
1716                 .pgbase   = pgbase,
1717                 .pglen    = pglen,
1718                 .pages    = &page,
1719         };
1720         struct rpc_message msg = {
1721                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1722                 .rpc_argp = &args,
1723                 .rpc_resp = NULL,
1724         };
1725
1726         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1727 }
1728
1729 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1730                 unsigned int pgbase, unsigned int pglen)
1731 {
1732         struct nfs4_exception exception = { };
1733         int err;
1734         do {
1735                 err = nfs4_handle_exception(NFS_SERVER(inode),
1736                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1737                                 &exception);
1738         } while (exception.retry);
1739         return err;
1740 }
1741
1742 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1743 {
1744         int flags = rdata->flags;
1745         struct inode *inode = rdata->inode;
1746         struct nfs_fattr *fattr = rdata->res.fattr;
1747         struct nfs_server *server = NFS_SERVER(inode);
1748         struct rpc_message msg = {
1749                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1750                 .rpc_argp       = &rdata->args,
1751                 .rpc_resp       = &rdata->res,
1752                 .rpc_cred       = rdata->cred,
1753         };
1754         unsigned long timestamp = jiffies;
1755         int status;
1756
1757         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1758                         (long long) rdata->args.offset);
1759
1760         nfs_fattr_init(fattr);
1761         status = rpc_call_sync(server->client, &msg, flags);
1762         if (!status)
1763                 renew_lease(server, timestamp);
1764         dprintk("NFS reply read: %d\n", status);
1765         return status;
1766 }
1767
1768 static int nfs4_proc_read(struct nfs_read_data *rdata)
1769 {
1770         struct nfs4_exception exception = { };
1771         int err;
1772         do {
1773                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1774                                 _nfs4_proc_read(rdata),
1775                                 &exception);
1776         } while (exception.retry);
1777         return err;
1778 }
1779
1780 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1781 {
1782         int rpcflags = wdata->flags;
1783         struct inode *inode = wdata->inode;
1784         struct nfs_fattr *fattr = wdata->res.fattr;
1785         struct nfs_server *server = NFS_SERVER(inode);
1786         struct rpc_message msg = {
1787                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1788                 .rpc_argp       = &wdata->args,
1789                 .rpc_resp       = &wdata->res,
1790                 .rpc_cred       = wdata->cred,
1791         };
1792         int status;
1793
1794         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1795                         (long long) wdata->args.offset);
1796
1797         wdata->args.bitmask = server->attr_bitmask;
1798         wdata->res.server = server;
1799         wdata->timestamp = jiffies;
1800         nfs_fattr_init(fattr);
1801         status = rpc_call_sync(server->client, &msg, rpcflags);
1802         dprintk("NFS reply write: %d\n", status);
1803         if (status < 0)
1804                 return status;
1805         renew_lease(server, wdata->timestamp);
1806         nfs_post_op_update_inode(inode, fattr);
1807         return wdata->res.count;
1808 }
1809
1810 static int nfs4_proc_write(struct nfs_write_data *wdata)
1811 {
1812         struct nfs4_exception exception = { };
1813         int err;
1814         do {
1815                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1816                                 _nfs4_proc_write(wdata),
1817                                 &exception);
1818         } while (exception.retry);
1819         return err;
1820 }
1821
1822 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1823 {
1824         struct inode *inode = cdata->inode;
1825         struct nfs_fattr *fattr = cdata->res.fattr;
1826         struct nfs_server *server = NFS_SERVER(inode);
1827         struct rpc_message msg = {
1828                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1829                 .rpc_argp       = &cdata->args,
1830                 .rpc_resp       = &cdata->res,
1831                 .rpc_cred       = cdata->cred,
1832         };
1833         int status;
1834
1835         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1836                         (long long) cdata->args.offset);
1837
1838         cdata->args.bitmask = server->attr_bitmask;
1839         cdata->res.server = server;
1840         cdata->timestamp = jiffies;
1841         nfs_fattr_init(fattr);
1842         status = rpc_call_sync(server->client, &msg, 0);
1843         if (status >= 0)
1844                 renew_lease(server, cdata->timestamp);
1845         dprintk("NFS reply commit: %d\n", status);
1846         if (status >= 0)
1847                 nfs_post_op_update_inode(inode, fattr);
1848         return status;
1849 }
1850
1851 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1852 {
1853         struct nfs4_exception exception = { };
1854         int err;
1855         do {
1856                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1857                                 _nfs4_proc_commit(cdata),
1858                                 &exception);
1859         } while (exception.retry);
1860         return err;
1861 }
1862
1863 /*
1864  * Got race?
1865  * We will need to arrange for the VFS layer to provide an atomic open.
1866  * Until then, this create/open method is prone to inefficiency and race
1867  * conditions due to the lookup, create, and open VFS calls from sys_open()
1868  * placed on the wire.
1869  *
1870  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1871  * The file will be opened again in the subsequent VFS open call
1872  * (nfs4_proc_file_open).
1873  *
1874  * The open for read will just hang around to be used by any process that
1875  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1876  */
1877
1878 static int
1879 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1880                  int flags, struct nameidata *nd)
1881 {
1882         struct nfs4_state *state;
1883         struct rpc_cred *cred;
1884         int status = 0;
1885
1886         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1887         if (IS_ERR(cred)) {
1888                 status = PTR_ERR(cred);
1889                 goto out;
1890         }
1891         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1892         put_rpccred(cred);
1893         if (IS_ERR(state)) {
1894                 status = PTR_ERR(state);
1895                 goto out;
1896         }
1897         d_instantiate(dentry, igrab(state->inode));
1898         if (flags & O_EXCL) {
1899                 struct nfs_fattr fattr;
1900                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1901                 if (status == 0)
1902                         nfs_setattr_update_inode(state->inode, sattr);
1903         }
1904         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1905                 status = nfs4_intent_set_file(nd, dentry, state);
1906         else
1907                 nfs4_close_state(state, flags);
1908 out:
1909         return status;
1910 }
1911
1912 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1913 {
1914         struct nfs_server *server = NFS_SERVER(dir);
1915         struct nfs4_remove_arg args = {
1916                 .fh = NFS_FH(dir),
1917                 .name = name,
1918                 .bitmask = server->attr_bitmask,
1919         };
1920         struct nfs_fattr dir_attr;
1921         struct nfs4_remove_res  res = {
1922                 .server = server,
1923                 .dir_attr = &dir_attr,
1924         };
1925         struct rpc_message msg = {
1926                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1927                 .rpc_argp       = &args,
1928                 .rpc_resp       = &res,
1929         };
1930         int                     status;
1931
1932         nfs_fattr_init(res.dir_attr);
1933         status = rpc_call_sync(server->client, &msg, 0);
1934         if (status == 0) {
1935                 update_changeattr(dir, &res.cinfo);
1936                 nfs_post_op_update_inode(dir, res.dir_attr);
1937         }
1938         return status;
1939 }
1940
1941 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1942 {
1943         struct nfs4_exception exception = { };
1944         int err;
1945         do {
1946                 err = nfs4_handle_exception(NFS_SERVER(dir),
1947                                 _nfs4_proc_remove(dir, name),
1948                                 &exception);
1949         } while (exception.retry);
1950         return err;
1951 }
1952
1953 struct unlink_desc {
1954         struct nfs4_remove_arg  args;
1955         struct nfs4_remove_res  res;
1956         struct nfs_fattr dir_attr;
1957 };
1958
1959 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1960                 struct qstr *name)
1961 {
1962         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1963         struct unlink_desc *up;
1964
1965         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1966         if (!up)
1967                 return -ENOMEM;
1968
1969         up->args.fh = NFS_FH(dir->d_inode);
1970         up->args.name = name;
1971         up->args.bitmask = server->attr_bitmask;
1972         up->res.server = server;
1973         up->res.dir_attr = &up->dir_attr;
1974
1975         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1976         msg->rpc_argp = &up->args;
1977         msg->rpc_resp = &up->res;
1978         return 0;
1979 }
1980
1981 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1982 {
1983         struct rpc_message *msg = &task->tk_msg;
1984         struct unlink_desc *up;
1985
1986         if (msg->rpc_resp != NULL) {
1987                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1988                 update_changeattr(dir->d_inode, &up->res.cinfo);
1989                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1990                 kfree(up);
1991                 msg->rpc_resp = NULL;
1992                 msg->rpc_argp = NULL;
1993         }
1994         return 0;
1995 }
1996
1997 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1998                 struct inode *new_dir, struct qstr *new_name)
1999 {
2000         struct nfs_server *server = NFS_SERVER(old_dir);
2001         struct nfs4_rename_arg arg = {
2002                 .old_dir = NFS_FH(old_dir),
2003                 .new_dir = NFS_FH(new_dir),
2004                 .old_name = old_name,
2005                 .new_name = new_name,
2006                 .bitmask = server->attr_bitmask,
2007         };
2008         struct nfs_fattr old_fattr, new_fattr;
2009         struct nfs4_rename_res res = {
2010                 .server = server,
2011                 .old_fattr = &old_fattr,
2012                 .new_fattr = &new_fattr,
2013         };
2014         struct rpc_message msg = {
2015                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2016                 .rpc_argp = &arg,
2017                 .rpc_resp = &res,
2018         };
2019         int                     status;
2020
2021         nfs_fattr_init(res.old_fattr);
2022         nfs_fattr_init(res.new_fattr);
2023         status = rpc_call_sync(server->client, &msg, 0);
2024
2025         if (!status) {
2026                 update_changeattr(old_dir, &res.old_cinfo);
2027                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2028                 update_changeattr(new_dir, &res.new_cinfo);
2029                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2030         }
2031         return status;
2032 }
2033
2034 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2035                 struct inode *new_dir, struct qstr *new_name)
2036 {
2037         struct nfs4_exception exception = { };
2038         int err;
2039         do {
2040                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2041                                 _nfs4_proc_rename(old_dir, old_name,
2042                                         new_dir, new_name),
2043                                 &exception);
2044         } while (exception.retry);
2045         return err;
2046 }
2047
2048 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2049 {
2050         struct nfs_server *server = NFS_SERVER(inode);
2051         struct nfs4_link_arg arg = {
2052                 .fh     = NFS_FH(inode),
2053                 .dir_fh = NFS_FH(dir),
2054                 .name   = name,
2055                 .bitmask = server->attr_bitmask,
2056         };
2057         struct nfs_fattr fattr, dir_attr;
2058         struct nfs4_link_res res = {
2059                 .server = server,
2060                 .fattr = &fattr,
2061                 .dir_attr = &dir_attr,
2062         };
2063         struct rpc_message msg = {
2064                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2065                 .rpc_argp = &arg,
2066                 .rpc_resp = &res,
2067         };
2068         int                     status;
2069
2070         nfs_fattr_init(res.fattr);
2071         nfs_fattr_init(res.dir_attr);
2072         status = rpc_call_sync(server->client, &msg, 0);
2073         if (!status) {
2074                 update_changeattr(dir, &res.cinfo);
2075                 nfs_post_op_update_inode(dir, res.dir_attr);
2076                 nfs_post_op_update_inode(inode, res.fattr);
2077         }
2078
2079         return status;
2080 }
2081
2082 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2083 {
2084         struct nfs4_exception exception = { };
2085         int err;
2086         do {
2087                 err = nfs4_handle_exception(NFS_SERVER(inode),
2088                                 _nfs4_proc_link(inode, dir, name),
2089                                 &exception);
2090         } while (exception.retry);
2091         return err;
2092 }
2093
2094 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2095                 struct page *page, unsigned int len, struct iattr *sattr)
2096 {
2097         struct nfs_server *server = NFS_SERVER(dir);
2098         struct nfs_fh fhandle;
2099         struct nfs_fattr fattr, dir_fattr;
2100         struct nfs4_create_arg arg = {
2101                 .dir_fh = NFS_FH(dir),
2102                 .server = server,
2103                 .name = &dentry->d_name,
2104                 .attrs = sattr,
2105                 .ftype = NF4LNK,
2106                 .bitmask = server->attr_bitmask,
2107         };
2108         struct nfs4_create_res res = {
2109                 .server = server,
2110                 .fh = &fhandle,
2111                 .fattr = &fattr,
2112                 .dir_fattr = &dir_fattr,
2113         };
2114         struct rpc_message msg = {
2115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2116                 .rpc_argp = &arg,
2117                 .rpc_resp = &res,
2118         };
2119         int                     status;
2120
2121         if (len > NFS4_MAXPATHLEN)
2122                 return -ENAMETOOLONG;
2123
2124         arg.u.symlink.pages = &page;
2125         arg.u.symlink.len = len;
2126         nfs_fattr_init(&fattr);
2127         nfs_fattr_init(&dir_fattr);
2128
2129         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2130         if (!status) {
2131                 update_changeattr(dir, &res.dir_cinfo);
2132                 nfs_post_op_update_inode(dir, res.dir_fattr);
2133                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2134         }
2135         return status;
2136 }
2137
2138 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2139                 struct page *page, unsigned int len, struct iattr *sattr)
2140 {
2141         struct nfs4_exception exception = { };
2142         int err;
2143         do {
2144                 err = nfs4_handle_exception(NFS_SERVER(dir),
2145                                 _nfs4_proc_symlink(dir, dentry, page,
2146                                                         len, sattr),
2147                                 &exception);
2148         } while (exception.retry);
2149         return err;
2150 }
2151
2152 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2153                 struct iattr *sattr)
2154 {
2155         struct nfs_server *server = NFS_SERVER(dir);
2156         struct nfs_fh fhandle;
2157         struct nfs_fattr fattr, dir_fattr;
2158         struct nfs4_create_arg arg = {
2159                 .dir_fh = NFS_FH(dir),
2160                 .server = server,
2161                 .name = &dentry->d_name,
2162                 .attrs = sattr,
2163                 .ftype = NF4DIR,
2164                 .bitmask = server->attr_bitmask,
2165         };
2166         struct nfs4_create_res res = {
2167                 .server = server,
2168                 .fh = &fhandle,
2169                 .fattr = &fattr,
2170                 .dir_fattr = &dir_fattr,
2171         };
2172         struct rpc_message msg = {
2173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2174                 .rpc_argp = &arg,
2175                 .rpc_resp = &res,
2176         };
2177         int                     status;
2178
2179         nfs_fattr_init(&fattr);
2180         nfs_fattr_init(&dir_fattr);
2181
2182         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2183         if (!status) {
2184                 update_changeattr(dir, &res.dir_cinfo);
2185                 nfs_post_op_update_inode(dir, res.dir_fattr);
2186                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2187         }
2188         return status;
2189 }
2190
2191 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2192                 struct iattr *sattr)
2193 {
2194         struct nfs4_exception exception = { };
2195         int err;
2196         do {
2197                 err = nfs4_handle_exception(NFS_SERVER(dir),
2198                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2199                                 &exception);
2200         } while (exception.retry);
2201         return err;
2202 }
2203
2204 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2205                   u64 cookie, struct page *page, unsigned int count, int plus)
2206 {
2207         struct inode            *dir = dentry->d_inode;
2208         struct nfs4_readdir_arg args = {
2209                 .fh = NFS_FH(dir),
2210                 .pages = &page,
2211                 .pgbase = 0,
2212                 .count = count,
2213                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2214         };
2215         struct nfs4_readdir_res res;
2216         struct rpc_message msg = {
2217                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2218                 .rpc_argp = &args,
2219                 .rpc_resp = &res,
2220                 .rpc_cred = cred,
2221         };
2222         int                     status;
2223
2224         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2225                         dentry->d_parent->d_name.name,
2226                         dentry->d_name.name,
2227                         (unsigned long long)cookie);
2228         lock_kernel();
2229         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2230         res.pgbase = args.pgbase;
2231         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2232         if (status == 0)
2233                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2234         unlock_kernel();
2235         dprintk("%s: returns %d\n", __FUNCTION__, status);
2236         return status;
2237 }
2238
2239 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2240                   u64 cookie, struct page *page, unsigned int count, int plus)
2241 {
2242         struct nfs4_exception exception = { };
2243         int err;
2244         do {
2245                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2246                                 _nfs4_proc_readdir(dentry, cred, cookie,
2247                                         page, count, plus),
2248                                 &exception);
2249         } while (exception.retry);
2250         return err;
2251 }
2252
2253 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2254                 struct iattr *sattr, dev_t rdev)
2255 {
2256         struct nfs_server *server = NFS_SERVER(dir);
2257         struct nfs_fh fh;
2258         struct nfs_fattr fattr, dir_fattr;
2259         struct nfs4_create_arg arg = {
2260                 .dir_fh = NFS_FH(dir),
2261                 .server = server,
2262                 .name = &dentry->d_name,
2263                 .attrs = sattr,
2264                 .bitmask = server->attr_bitmask,
2265         };
2266         struct nfs4_create_res res = {
2267                 .server = server,
2268                 .fh = &fh,
2269                 .fattr = &fattr,
2270                 .dir_fattr = &dir_fattr,
2271         };
2272         struct rpc_message msg = {
2273                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2274                 .rpc_argp = &arg,
2275                 .rpc_resp = &res,
2276         };
2277         int                     status;
2278         int                     mode = sattr->ia_mode;
2279
2280         nfs_fattr_init(&fattr);
2281         nfs_fattr_init(&dir_fattr);
2282
2283         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2284         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2285         if (S_ISFIFO(mode))
2286                 arg.ftype = NF4FIFO;
2287         else if (S_ISBLK(mode)) {
2288                 arg.ftype = NF4BLK;
2289                 arg.u.device.specdata1 = MAJOR(rdev);
2290                 arg.u.device.specdata2 = MINOR(rdev);
2291         }
2292         else if (S_ISCHR(mode)) {
2293                 arg.ftype = NF4CHR;
2294                 arg.u.device.specdata1 = MAJOR(rdev);
2295                 arg.u.device.specdata2 = MINOR(rdev);
2296         }
2297         else
2298                 arg.ftype = NF4SOCK;
2299
2300         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2301         if (status == 0) {
2302                 update_changeattr(dir, &res.dir_cinfo);
2303                 nfs_post_op_update_inode(dir, res.dir_fattr);
2304                 status = nfs_instantiate(dentry, &fh, &fattr);
2305         }
2306         return status;
2307 }
2308
2309 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2310                 struct iattr *sattr, dev_t rdev)
2311 {
2312         struct nfs4_exception exception = { };
2313         int err;
2314         do {
2315                 err = nfs4_handle_exception(NFS_SERVER(dir),
2316                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2317                                 &exception);
2318         } while (exception.retry);
2319         return err;
2320 }
2321
2322 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2323                  struct nfs_fsstat *fsstat)
2324 {
2325         struct nfs4_statfs_arg args = {
2326                 .fh = fhandle,
2327                 .bitmask = server->attr_bitmask,
2328         };
2329         struct rpc_message msg = {
2330                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2331                 .rpc_argp = &args,
2332                 .rpc_resp = fsstat,
2333         };
2334
2335         nfs_fattr_init(fsstat->fattr);
2336         return rpc_call_sync(server->client, &msg, 0);
2337 }
2338
2339 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2340 {
2341         struct nfs4_exception exception = { };
2342         int err;
2343         do {
2344                 err = nfs4_handle_exception(server,
2345                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2346                                 &exception);
2347         } while (exception.retry);
2348         return err;
2349 }
2350
2351 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2352                 struct nfs_fsinfo *fsinfo)
2353 {
2354         struct nfs4_fsinfo_arg args = {
2355                 .fh = fhandle,
2356                 .bitmask = server->attr_bitmask,
2357         };
2358         struct rpc_message msg = {
2359                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2360                 .rpc_argp = &args,
2361                 .rpc_resp = fsinfo,
2362         };
2363
2364         return rpc_call_sync(server->client, &msg, 0);
2365 }
2366
2367 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2368 {
2369         struct nfs4_exception exception = { };
2370         int err;
2371
2372         do {
2373                 err = nfs4_handle_exception(server,
2374                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2375                                 &exception);
2376         } while (exception.retry);
2377         return err;
2378 }
2379
2380 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2381 {
2382         nfs_fattr_init(fsinfo->fattr);
2383         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2384 }
2385
2386 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2387                 struct nfs_pathconf *pathconf)
2388 {
2389         struct nfs4_pathconf_arg args = {
2390                 .fh = fhandle,
2391                 .bitmask = server->attr_bitmask,
2392         };
2393         struct rpc_message msg = {
2394                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2395                 .rpc_argp = &args,
2396                 .rpc_resp = pathconf,
2397         };
2398
2399         /* None of the pathconf attributes are mandatory to implement */
2400         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2401                 memset(pathconf, 0, sizeof(*pathconf));
2402                 return 0;
2403         }
2404
2405         nfs_fattr_init(pathconf->fattr);
2406         return rpc_call_sync(server->client, &msg, 0);
2407 }
2408
2409 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2410                 struct nfs_pathconf *pathconf)
2411 {
2412         struct nfs4_exception exception = { };
2413         int err;
2414
2415         do {
2416                 err = nfs4_handle_exception(server,
2417                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2418                                 &exception);
2419         } while (exception.retry);
2420         return err;
2421 }
2422
2423 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2424 {
2425         struct nfs_server *server = NFS_SERVER(data->inode);
2426
2427         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2428                 rpc_restart_call(task);
2429                 return -EAGAIN;
2430         }
2431         if (task->tk_status > 0)
2432                 renew_lease(server, data->timestamp);
2433         return 0;
2434 }
2435
2436 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2437 {
2438         struct rpc_message msg = {
2439                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2440                 .rpc_argp = &data->args,
2441                 .rpc_resp = &data->res,
2442                 .rpc_cred = data->cred,
2443         };
2444
2445         data->timestamp   = jiffies;
2446
2447         rpc_call_setup(&data->task, &msg, 0);
2448 }
2449
2450 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2451 {
2452         struct inode *inode = data->inode;
2453
2454         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2455                 rpc_restart_call(task);
2456                 return -EAGAIN;
2457         }
2458         if (task->tk_status >= 0) {
2459                 renew_lease(NFS_SERVER(inode), data->timestamp);
2460                 nfs_post_op_update_inode(inode, data->res.fattr);
2461         }
2462         return 0;
2463 }
2464
2465 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2466 {
2467         struct rpc_message msg = {
2468                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2469                 .rpc_argp = &data->args,
2470                 .rpc_resp = &data->res,
2471                 .rpc_cred = data->cred,
2472         };
2473         struct inode *inode = data->inode;
2474         struct nfs_server *server = NFS_SERVER(inode);
2475         int stable;
2476
2477         if (how & FLUSH_STABLE) {
2478                 if (!NFS_I(inode)->ncommit)
2479                         stable = NFS_FILE_SYNC;
2480                 else
2481                         stable = NFS_DATA_SYNC;
2482         } else
2483                 stable = NFS_UNSTABLE;
2484         data->args.stable = stable;
2485         data->args.bitmask = server->attr_bitmask;
2486         data->res.server = server;
2487
2488         data->timestamp   = jiffies;
2489
2490         /* Finalize the task. */
2491         rpc_call_setup(&data->task, &msg, 0);
2492 }
2493
2494 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2495 {
2496         struct inode *inode = data->inode;
2497
2498         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2499                 rpc_restart_call(task);
2500                 return -EAGAIN;
2501         }
2502         if (task->tk_status >= 0)
2503                 nfs_post_op_update_inode(inode, data->res.fattr);
2504         return 0;
2505 }
2506
2507 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2508 {
2509         struct rpc_message msg = {
2510                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2511                 .rpc_argp = &data->args,
2512                 .rpc_resp = &data->res,
2513                 .rpc_cred = data->cred,
2514         };
2515         struct nfs_server *server = NFS_SERVER(data->inode);
2516
2517         data->args.bitmask = server->attr_bitmask;
2518         data->res.server = server;
2519
2520         rpc_call_setup(&data->task, &msg, 0);
2521 }
2522
2523 /*
2524  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2525  * standalone procedure for queueing an asynchronous RENEW.
2526  */
2527 static void nfs4_renew_done(struct rpc_task *task, void *data)
2528 {
2529         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2530         unsigned long timestamp = (unsigned long)data;
2531
2532         if (task->tk_status < 0) {
2533                 switch (task->tk_status) {
2534                         case -NFS4ERR_STALE_CLIENTID:
2535                         case -NFS4ERR_EXPIRED:
2536                         case -NFS4ERR_CB_PATH_DOWN:
2537                                 nfs4_schedule_state_recovery(clp);
2538                 }
2539                 return;
2540         }
2541         spin_lock(&clp->cl_lock);
2542         if (time_before(clp->cl_last_renewal,timestamp))
2543                 clp->cl_last_renewal = timestamp;
2544         spin_unlock(&clp->cl_lock);
2545 }
2546
2547 static const struct rpc_call_ops nfs4_renew_ops = {
2548         .rpc_call_done = nfs4_renew_done,
2549 };
2550
2551 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2552 {
2553         struct rpc_message msg = {
2554                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2555                 .rpc_argp       = clp,
2556                 .rpc_cred       = cred,
2557         };
2558
2559         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2560                         &nfs4_renew_ops, (void *)jiffies);
2561 }
2562
2563 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2564 {
2565         struct rpc_message msg = {
2566                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2567                 .rpc_argp       = clp,
2568                 .rpc_cred       = cred,
2569         };
2570         unsigned long now = jiffies;
2571         int status;
2572
2573         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2574         if (status < 0)
2575                 return status;
2576         spin_lock(&clp->cl_lock);
2577         if (time_before(clp->cl_last_renewal,now))
2578                 clp->cl_last_renewal = now;
2579         spin_unlock(&clp->cl_lock);
2580         return 0;
2581 }
2582
2583 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2584 {
2585         return (server->caps & NFS_CAP_ACLS)
2586                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2587                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2588 }
2589
2590 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2591  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2592  * the stack.
2593  */
2594 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2595
2596 static void buf_to_pages(const void *buf, size_t buflen,
2597                 struct page **pages, unsigned int *pgbase)
2598 {
2599         const void *p = buf;
2600
2601         *pgbase = offset_in_page(buf);
2602         p -= *pgbase;
2603         while (p < buf + buflen) {
2604                 *(pages++) = virt_to_page(p);
2605                 p += PAGE_CACHE_SIZE;
2606         }
2607 }
2608
2609 struct nfs4_cached_acl {
2610         int cached;
2611         size_t len;
2612         char data[0];
2613 };
2614
2615 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2616 {
2617         struct nfs_inode *nfsi = NFS_I(inode);
2618
2619         spin_lock(&inode->i_lock);
2620         kfree(nfsi->nfs4_acl);
2621         nfsi->nfs4_acl = acl;
2622         spin_unlock(&inode->i_lock);
2623 }
2624
2625 static void nfs4_zap_acl_attr(struct inode *inode)
2626 {
2627         nfs4_set_cached_acl(inode, NULL);
2628 }
2629
2630 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2631 {
2632         struct nfs_inode *nfsi = NFS_I(inode);
2633         struct nfs4_cached_acl *acl;
2634         int ret = -ENOENT;
2635
2636         spin_lock(&inode->i_lock);
2637         acl = nfsi->nfs4_acl;
2638         if (acl == NULL)
2639                 goto out;
2640         if (buf == NULL) /* user is just asking for length */
2641                 goto out_len;
2642         if (acl->cached == 0)
2643                 goto out;
2644         ret = -ERANGE; /* see getxattr(2) man page */
2645         if (acl->len > buflen)
2646                 goto out;
2647         memcpy(buf, acl->data, acl->len);
2648 out_len:
2649         ret = acl->len;
2650 out:
2651         spin_unlock(&inode->i_lock);
2652         return ret;
2653 }
2654
2655 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2656 {
2657         struct nfs4_cached_acl *acl;
2658
2659         if (buf && acl_len <= PAGE_SIZE) {
2660                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2661                 if (acl == NULL)
2662                         goto out;
2663                 acl->cached = 1;
2664                 memcpy(acl->data, buf, acl_len);
2665         } else {
2666                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2667                 if (acl == NULL)
2668                         goto out;
2669                 acl->cached = 0;
2670         }
2671         acl->len = acl_len;
2672 out:
2673         nfs4_set_cached_acl(inode, acl);
2674 }
2675
2676 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2677 {
2678         struct page *pages[NFS4ACL_MAXPAGES];
2679         struct nfs_getaclargs args = {
2680                 .fh = NFS_FH(inode),
2681                 .acl_pages = pages,
2682                 .acl_len = buflen,
2683         };
2684         size_t resp_len = buflen;
2685         void *resp_buf;
2686         struct rpc_message msg = {
2687                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2688                 .rpc_argp = &args,
2689                 .rpc_resp = &resp_len,
2690         };
2691         struct page *localpage = NULL;
2692         int ret;
2693
2694         if (buflen < PAGE_SIZE) {
2695                 /* As long as we're doing a round trip to the server anyway,
2696                  * let's be prepared for a page of acl data. */
2697                 localpage = alloc_page(GFP_KERNEL);
2698                 resp_buf = page_address(localpage);
2699                 if (localpage == NULL)
2700                         return -ENOMEM;
2701                 args.acl_pages[0] = localpage;
2702                 args.acl_pgbase = 0;
2703                 resp_len = args.acl_len = PAGE_SIZE;
2704         } else {
2705                 resp_buf = buf;
2706                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2707         }
2708         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2709         if (ret)
2710                 goto out_free;
2711         if (resp_len > args.acl_len)
2712                 nfs4_write_cached_acl(inode, NULL, resp_len);
2713         else
2714                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2715         if (buf) {
2716                 ret = -ERANGE;
2717                 if (resp_len > buflen)
2718                         goto out_free;
2719                 if (localpage)
2720                         memcpy(buf, resp_buf, resp_len);
2721         }
2722         ret = resp_len;
2723 out_free:
2724         if (localpage)
2725                 __free_page(localpage);
2726         return ret;
2727 }
2728
2729 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2730 {
2731         struct nfs4_exception exception = { };
2732         ssize_t ret;
2733         do {
2734                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2735                 if (ret >= 0)
2736                         break;
2737                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2738         } while (exception.retry);
2739         return ret;
2740 }
2741
2742 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2743 {
2744         struct nfs_server *server = NFS_SERVER(inode);
2745         int ret;
2746
2747         if (!nfs4_server_supports_acls(server))
2748                 return -EOPNOTSUPP;
2749         ret = nfs_revalidate_inode(server, inode);
2750         if (ret < 0)
2751                 return ret;
2752         ret = nfs4_read_cached_acl(inode, buf, buflen);
2753         if (ret != -ENOENT)
2754                 return ret;
2755         return nfs4_get_acl_uncached(inode, buf, buflen);
2756 }
2757
2758 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2759 {
2760         struct nfs_server *server = NFS_SERVER(inode);
2761         struct page *pages[NFS4ACL_MAXPAGES];
2762         struct nfs_setaclargs arg = {
2763                 .fh             = NFS_FH(inode),
2764                 .acl_pages      = pages,
2765                 .acl_len        = buflen,
2766         };
2767         struct rpc_message msg = {
2768                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2769                 .rpc_argp       = &arg,
2770                 .rpc_resp       = NULL,
2771         };
2772         int ret;
2773
2774         if (!nfs4_server_supports_acls(server))
2775                 return -EOPNOTSUPP;
2776         nfs_inode_return_delegation(inode);
2777         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2778         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2779         if (ret == 0)
2780                 nfs4_write_cached_acl(inode, buf, buflen);
2781         return ret;
2782 }
2783
2784 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2785 {
2786         struct nfs4_exception exception = { };
2787         int err;
2788         do {
2789                 err = nfs4_handle_exception(NFS_SERVER(inode),
2790                                 __nfs4_proc_set_acl(inode, buf, buflen),
2791                                 &exception);
2792         } while (exception.retry);
2793         return err;
2794 }
2795
2796 static int
2797 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2798 {
2799         struct nfs_client *clp = server->nfs_client;
2800
2801         if (!clp || task->tk_status >= 0)
2802                 return 0;
2803         switch(task->tk_status) {
2804                 case -NFS4ERR_STALE_CLIENTID:
2805                 case -NFS4ERR_STALE_STATEID:
2806                 case -NFS4ERR_EXPIRED:
2807                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2808                         nfs4_schedule_state_recovery(clp);
2809                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2810                                 rpc_wake_up_task(task);
2811                         task->tk_status = 0;
2812                         return -EAGAIN;
2813                 case -NFS4ERR_DELAY:
2814                         nfs_inc_server_stats((struct nfs_server *) server,
2815                                                 NFSIOS_DELAY);
2816                 case -NFS4ERR_GRACE:
2817                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2818                         task->tk_status = 0;
2819                         return -EAGAIN;
2820                 case -NFS4ERR_OLD_STATEID:
2821                         task->tk_status = 0;
2822                         return -EAGAIN;
2823         }
2824         task->tk_status = nfs4_map_errors(task->tk_status);
2825         return 0;
2826 }
2827
2828 static int nfs4_wait_bit_interruptible(void *word)
2829 {
2830         if (signal_pending(current))
2831                 return -ERESTARTSYS;
2832         schedule();
2833         return 0;
2834 }
2835
2836 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2837 {
2838         sigset_t oldset;
2839         int res;
2840
2841         might_sleep();
2842
2843         rpc_clnt_sigmask(clnt, &oldset);
2844         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2845                         nfs4_wait_bit_interruptible,
2846                         TASK_INTERRUPTIBLE);
2847         rpc_clnt_sigunmask(clnt, &oldset);
2848         return res;
2849 }
2850
2851 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2852 {
2853         sigset_t oldset;
2854         int res = 0;
2855
2856         might_sleep();
2857
2858         if (*timeout <= 0)
2859                 *timeout = NFS4_POLL_RETRY_MIN;
2860         if (*timeout > NFS4_POLL_RETRY_MAX)
2861                 *timeout = NFS4_POLL_RETRY_MAX;
2862         rpc_clnt_sigmask(clnt, &oldset);
2863         if (clnt->cl_intr) {
2864                 schedule_timeout_interruptible(*timeout);
2865                 if (signalled())
2866                         res = -ERESTARTSYS;
2867         } else
2868                 schedule_timeout_uninterruptible(*timeout);
2869         rpc_clnt_sigunmask(clnt, &oldset);
2870         *timeout <<= 1;
2871         return res;
2872 }
2873
2874 /* This is the error handling routine for processes that are allowed
2875  * to sleep.
2876  */
2877 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2878 {
2879         struct nfs_client *clp = server->nfs_client;
2880         int ret = errorcode;
2881
2882         exception->retry = 0;
2883         switch(errorcode) {
2884                 case 0:
2885                         return 0;
2886                 case -NFS4ERR_STALE_CLIENTID:
2887                 case -NFS4ERR_STALE_STATEID:
2888                 case -NFS4ERR_EXPIRED:
2889                         nfs4_schedule_state_recovery(clp);
2890                         ret = nfs4_wait_clnt_recover(server->client, clp);
2891                         if (ret == 0)
2892                                 exception->retry = 1;
2893                         break;
2894                 case -NFS4ERR_FILE_OPEN:
2895                 case -NFS4ERR_GRACE:
2896                 case -NFS4ERR_DELAY:
2897                         ret = nfs4_delay(server->client, &exception->timeout);
2898                         if (ret != 0)
2899                                 break;
2900                 case -NFS4ERR_OLD_STATEID:
2901                         exception->retry = 1;
2902         }
2903         /* We failed to handle the error */
2904         return nfs4_map_errors(ret);
2905 }
2906
2907 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2908 {
2909         nfs4_verifier sc_verifier;
2910         struct nfs4_setclientid setclientid = {
2911                 .sc_verifier = &sc_verifier,
2912                 .sc_prog = program,
2913         };
2914         struct rpc_message msg = {
2915                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2916                 .rpc_argp = &setclientid,
2917                 .rpc_resp = clp,
2918                 .rpc_cred = cred,
2919         };
2920         u32 *p;
2921         int loop = 0;
2922         int status;
2923
2924         p = (u32*)sc_verifier.data;
2925         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2926         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2927
2928         for(;;) {
2929                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2930                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2931                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2932                                 cred->cr_ops->cr_name,
2933                                 clp->cl_id_uniquifier);
2934                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2935                                 sizeof(setclientid.sc_netid), "tcp");
2936                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2937                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2938                                 clp->cl_ipaddr, port >> 8, port & 255);
2939
2940                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2941                 if (status != -NFS4ERR_CLID_INUSE)
2942                         break;
2943                 if (signalled())
2944                         break;
2945                 if (loop++ & 1)
2946                         ssleep(clp->cl_lease_time + 1);
2947                 else
2948                         if (++clp->cl_id_uniquifier == 0)
2949                                 break;
2950         }
2951         return status;
2952 }
2953
2954 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2955 {
2956         struct nfs_fsinfo fsinfo;
2957         struct rpc_message msg = {
2958                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2959                 .rpc_argp = clp,
2960                 .rpc_resp = &fsinfo,
2961                 .rpc_cred = cred,
2962         };
2963         unsigned long now;
2964         int status;
2965
2966         now = jiffies;
2967         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2968         if (status == 0) {
2969                 spin_lock(&clp->cl_lock);
2970                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2971                 clp->cl_last_renewal = now;
2972                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2973                 spin_unlock(&clp->cl_lock);
2974         }
2975         return status;
2976 }
2977
2978 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2979 {
2980         long timeout;
2981         int err;
2982         do {
2983                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2984                 switch (err) {
2985                         case 0:
2986                                 return err;
2987                         case -NFS4ERR_RESOURCE:
2988                                 /* The IBM lawyers misread another document! */
2989                         case -NFS4ERR_DELAY:
2990                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2991                 }
2992         } while (err == 0);
2993         return err;
2994 }
2995
2996 struct nfs4_delegreturndata {
2997         struct nfs4_delegreturnargs args;
2998         struct nfs4_delegreturnres res;
2999         struct nfs_fh fh;
3000         nfs4_stateid stateid;
3001         struct rpc_cred *cred;
3002         unsigned long timestamp;
3003         struct nfs_fattr fattr;
3004         int rpc_status;
3005 };
3006
3007 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
3008 {
3009         struct nfs4_delegreturndata *data = calldata;
3010         struct rpc_message msg = {
3011                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3012                 .rpc_argp = &data->args,
3013                 .rpc_resp = &data->res,
3014                 .rpc_cred = data->cred,
3015         };
3016         nfs_fattr_init(data->res.fattr);
3017         rpc_call_setup(task, &msg, 0);
3018 }
3019
3020 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3021 {
3022         struct nfs4_delegreturndata *data = calldata;
3023         data->rpc_status = task->tk_status;
3024         if (data->rpc_status == 0)
3025                 renew_lease(data->res.server, data->timestamp);
3026 }
3027
3028 static void nfs4_delegreturn_release(void *calldata)
3029 {
3030         struct nfs4_delegreturndata *data = calldata;
3031
3032         put_rpccred(data->cred);
3033         kfree(calldata);
3034 }
3035
3036 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3037         .rpc_call_prepare = nfs4_delegreturn_prepare,
3038         .rpc_call_done = nfs4_delegreturn_done,
3039         .rpc_release = nfs4_delegreturn_release,
3040 };
3041
3042 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3043 {
3044         struct nfs4_delegreturndata *data;
3045         struct nfs_server *server = NFS_SERVER(inode);
3046         struct rpc_task *task;
3047         int status;
3048
3049         data = kmalloc(sizeof(*data), GFP_KERNEL);
3050         if (data == NULL)
3051                 return -ENOMEM;
3052         data->args.fhandle = &data->fh;
3053         data->args.stateid = &data->stateid;
3054         data->args.bitmask = server->attr_bitmask;
3055         nfs_copy_fh(&data->fh, NFS_FH(inode));
3056         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3057         data->res.fattr = &data->fattr;
3058         data->res.server = server;
3059         data->cred = get_rpccred(cred);
3060         data->timestamp = jiffies;
3061         data->rpc_status = 0;
3062
3063         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3064         if (IS_ERR(task))
3065                 return PTR_ERR(task);
3066         status = nfs4_wait_for_completion_rpc_task(task);
3067         if (status == 0) {
3068                 status = data->rpc_status;
3069                 if (status == 0)
3070                         nfs_post_op_update_inode(inode, &data->fattr);
3071         }
3072         rpc_release_task(task);
3073         return status;
3074 }
3075
3076 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3077 {
3078         struct nfs_server *server = NFS_SERVER(inode);
3079         struct nfs4_exception exception = { };
3080         int err;
3081         do {
3082                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3083                 switch (err) {
3084                         case -NFS4ERR_STALE_STATEID:
3085                         case -NFS4ERR_EXPIRED:
3086                                 nfs4_schedule_state_recovery(server->nfs_client);
3087                         case 0:
3088                                 return 0;
3089                 }
3090                 err = nfs4_handle_exception(server, err, &exception);
3091         } while (exception.retry);
3092         return err;
3093 }
3094
3095 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3096 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3097
3098 /*
3099  * sleep, with exponential backoff, and retry the LOCK operation.
3100  */
3101 static unsigned long
3102 nfs4_set_lock_task_retry(unsigned long timeout)
3103 {
3104         schedule_timeout_interruptible(timeout);
3105         timeout <<= 1;
3106         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3107                 return NFS4_LOCK_MAXTIMEOUT;
3108         return timeout;
3109 }
3110
3111 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3112 {
3113         struct inode *inode = state->inode;
3114         struct nfs_server *server = NFS_SERVER(inode);
3115         struct nfs_client *clp = server->nfs_client;
3116         struct nfs_lockt_args arg = {
3117                 .fh = NFS_FH(inode),
3118                 .fl = request,
3119         };
3120         struct nfs_lockt_res res = {
3121                 .denied = request,
3122         };
3123         struct rpc_message msg = {
3124                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3125                 .rpc_argp       = &arg,
3126                 .rpc_resp       = &res,
3127                 .rpc_cred       = state->owner->so_cred,
3128         };
3129         struct nfs4_lock_state *lsp;
3130         int status;
3131
3132         down_read(&clp->cl_sem);
3133         arg.lock_owner.clientid = clp->cl_clientid;
3134         status = nfs4_set_lock_state(state, request);
3135         if (status != 0)
3136                 goto out;
3137         lsp = request->fl_u.nfs4_fl.owner;
3138         arg.lock_owner.id = lsp->ls_id;
3139         status = rpc_call_sync(server->client, &msg, 0);
3140         switch (status) {
3141                 case 0:
3142                         request->fl_type = F_UNLCK;
3143                         break;
3144                 case -NFS4ERR_DENIED:
3145                         status = 0;
3146         }
3147 out:
3148         up_read(&clp->cl_sem);
3149         return status;
3150 }
3151
3152 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3153 {
3154         struct nfs4_exception exception = { };
3155         int err;
3156
3157         do {
3158                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3159                                 _nfs4_proc_getlk(state, cmd, request),
3160                                 &exception);
3161         } while (exception.retry);
3162         return err;
3163 }
3164
3165 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3166 {
3167         int res = 0;
3168         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3169                 case FL_POSIX:
3170                         res = posix_lock_file_wait(file, fl);
3171                         break;
3172                 case FL_FLOCK:
3173                         res = flock_lock_file_wait(file, fl);
3174                         break;
3175                 default:
3176                         BUG();
3177         }
3178         return res;
3179 }
3180
3181 struct nfs4_unlockdata {
3182         struct nfs_locku_args arg;
3183         struct nfs_locku_res res;
3184         struct nfs4_lock_state *lsp;
3185         struct nfs_open_context *ctx;
3186         struct file_lock fl;
3187         const struct nfs_server *server;
3188         unsigned long timestamp;
3189 };
3190
3191 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3192                 struct nfs_open_context *ctx,
3193                 struct nfs4_lock_state *lsp,
3194                 struct nfs_seqid *seqid)
3195 {
3196         struct nfs4_unlockdata *p;
3197         struct inode *inode = lsp->ls_state->inode;
3198
3199         p = kmalloc(sizeof(*p), GFP_KERNEL);
3200         if (p == NULL)
3201                 return NULL;
3202         p->arg.fh = NFS_FH(inode);
3203         p->arg.fl = &p->fl;
3204         p->arg.seqid = seqid;
3205         p->arg.stateid = &lsp->ls_stateid;
3206         p->lsp = lsp;
3207         atomic_inc(&lsp->ls_count);
3208         /* Ensure we don't close file until we're done freeing locks! */
3209         p->ctx = get_nfs_open_context(ctx);
3210         memcpy(&p->fl, fl, sizeof(p->fl));
3211         p->server = NFS_SERVER(inode);
3212         return p;
3213 }
3214
3215 static void nfs4_locku_release_calldata(void *data)
3216 {
3217         struct nfs4_unlockdata *calldata = data;
3218         nfs_free_seqid(calldata->arg.seqid);
3219         nfs4_put_lock_state(calldata->lsp);
3220         put_nfs_open_context(calldata->ctx);
3221         kfree(calldata);
3222 }
3223
3224 static void nfs4_locku_done(struct rpc_task *task, void *data)
3225 {
3226         struct nfs4_unlockdata *calldata = data;
3227
3228         if (RPC_ASSASSINATED(task))
3229                 return;
3230         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3231         switch (task->tk_status) {
3232                 case 0:
3233                         memcpy(calldata->lsp->ls_stateid.data,
3234                                         calldata->res.stateid.data,
3235                                         sizeof(calldata->lsp->ls_stateid.data));
3236                         renew_lease(calldata->server, calldata->timestamp);
3237                         break;
3238                 case -NFS4ERR_STALE_STATEID:
3239                 case -NFS4ERR_EXPIRED:
3240                         nfs4_schedule_state_recovery(calldata->server->nfs_client);
3241                         break;
3242                 default:
3243                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3244                                 rpc_restart_call(task);
3245                         }
3246         }
3247 }
3248
3249 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3250 {
3251         struct nfs4_unlockdata *calldata = data;
3252         struct rpc_message msg = {
3253                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3254                 .rpc_argp       = &calldata->arg,
3255                 .rpc_resp       = &calldata->res,
3256                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3257         };
3258
3259         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3260                 return;
3261         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3262                 /* Note: exit _without_ running nfs4_locku_done */
3263                 task->tk_action = NULL;
3264                 return;
3265         }
3266         calldata->timestamp = jiffies;
3267         rpc_call_setup(task, &msg, 0);
3268 }
3269
3270 static const struct rpc_call_ops nfs4_locku_ops = {
3271         .rpc_call_prepare = nfs4_locku_prepare,
3272         .rpc_call_done = nfs4_locku_done,
3273         .rpc_release = nfs4_locku_release_calldata,
3274 };
3275
3276 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3277                 struct nfs_open_context *ctx,
3278                 struct nfs4_lock_state *lsp,
3279                 struct nfs_seqid *seqid)
3280 {
3281         struct nfs4_unlockdata *data;
3282
3283         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3284         if (data == NULL) {
3285                 nfs_free_seqid(seqid);
3286                 return ERR_PTR(-ENOMEM);
3287         }
3288
3289         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3290 }
3291
3292 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3293 {
3294         struct nfs_seqid *seqid;
3295         struct nfs4_lock_state *lsp;
3296         struct rpc_task *task;
3297         int status = 0;
3298
3299         status = nfs4_set_lock_state(state, request);
3300         /* Unlock _before_ we do the RPC call */
3301         request->fl_flags |= FL_EXISTS;
3302         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3303                 goto out;
3304         if (status != 0)
3305                 goto out;
3306         /* Is this a delegated lock? */
3307         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3308                 goto out;
3309         lsp = request->fl_u.nfs4_fl.owner;
3310         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3311         status = -ENOMEM;
3312         if (seqid == NULL)
3313                 goto out;
3314         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3315         status = PTR_ERR(task);
3316         if (IS_ERR(task))
3317                 goto out;
3318         status = nfs4_wait_for_completion_rpc_task(task);
3319         rpc_release_task(task);
3320 out:
3321         return status;
3322 }
3323
3324 struct nfs4_lockdata {
3325         struct nfs_lock_args arg;
3326         struct nfs_lock_res res;
3327         struct nfs4_lock_state *lsp;
3328         struct nfs_open_context *ctx;
3329         struct file_lock fl;
3330         unsigned long timestamp;
3331         int rpc_status;
3332         int cancelled;
3333 };
3334
3335 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3336                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3337 {
3338         struct nfs4_lockdata *p;
3339         struct inode *inode = lsp->ls_state->inode;
3340         struct nfs_server *server = NFS_SERVER(inode);
3341
3342         p = kzalloc(sizeof(*p), GFP_KERNEL);
3343         if (p == NULL)
3344                 return NULL;
3345
3346         p->arg.fh = NFS_FH(inode);
3347         p->arg.fl = &p->fl;
3348         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3349         if (p->arg.lock_seqid == NULL)
3350                 goto out_free;
3351         p->arg.lock_stateid = &lsp->ls_stateid;
3352         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3353         p->arg.lock_owner.id = lsp->ls_id;
3354         p->lsp = lsp;
3355         atomic_inc(&lsp->ls_count);
3356         p->ctx = get_nfs_open_context(ctx);
3357         memcpy(&p->fl, fl, sizeof(p->fl));
3358         return p;
3359 out_free:
3360         kfree(p);
3361         return NULL;
3362 }
3363
3364 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3365 {
3366         struct nfs4_lockdata *data = calldata;
3367         struct nfs4_state *state = data->lsp->ls_state;
3368         struct nfs4_state_owner *sp = state->owner;
3369         struct rpc_message msg = {
3370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3371                 .rpc_argp = &data->arg,
3372                 .rpc_resp = &data->res,
3373                 .rpc_cred = sp->so_cred,
3374         };
3375
3376         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3377                 return;
3378         dprintk("%s: begin!\n", __FUNCTION__);
3379         /* Do we need to do an open_to_lock_owner? */
3380         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3381                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3382                 if (data->arg.open_seqid == NULL) {
3383                         data->rpc_status = -ENOMEM;
3384                         task->tk_action = NULL;
3385                         goto out;
3386                 }
3387                 data->arg.open_stateid = &state->stateid;
3388                 data->arg.new_lock_owner = 1;
3389         }
3390         data->timestamp = jiffies;
3391         rpc_call_setup(task, &msg, 0);
3392 out:
3393         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3394 }
3395
3396 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3397 {
3398         struct nfs4_lockdata *data = calldata;
3399
3400         dprintk("%s: begin!\n", __FUNCTION__);
3401
3402         data->rpc_status = task->tk_status;
3403         if (RPC_ASSASSINATED(task))
3404                 goto out;
3405         if (data->arg.new_lock_owner != 0) {
3406                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3407                 if (data->rpc_status == 0)
3408                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3409                 else
3410                         goto out;
3411         }
3412         if (data->rpc_status == 0) {
3413                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3414                                         sizeof(data->lsp->ls_stateid.data));
3415                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3416                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3417         }
3418         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3419 out:
3420         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3421 }
3422
3423 static void nfs4_lock_release(void *calldata)
3424 {
3425         struct nfs4_lockdata *data = calldata;
3426
3427         dprintk("%s: begin!\n", __FUNCTION__);
3428         if (data->arg.open_seqid != NULL)
3429                 nfs_free_seqid(data->arg.open_seqid);
3430         if (data->cancelled != 0) {
3431                 struct rpc_task *task;
3432                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3433                                 data->arg.lock_seqid);
3434                 if (!IS_ERR(task))
3435                         rpc_release_task(task);
3436                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3437         } else
3438                 nfs_free_seqid(data->arg.lock_seqid);
3439         nfs4_put_lock_state(data->lsp);
3440         put_nfs_open_context(data->ctx);
3441         kfree(data);
3442         dprintk("%s: done!\n", __FUNCTION__);
3443 }
3444
3445 static const struct rpc_call_ops nfs4_lock_ops = {
3446         .rpc_call_prepare = nfs4_lock_prepare,
3447         .rpc_call_done = nfs4_lock_done,
3448         .rpc_release = nfs4_lock_release,
3449 };
3450
3451 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3452 {
3453         struct nfs4_lockdata *data;
3454         struct rpc_task *task;
3455         int ret;
3456
3457         dprintk("%s: begin!\n", __FUNCTION__);
3458         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3459                         fl->fl_u.nfs4_fl.owner);
3460         if (data == NULL)
3461                 return -ENOMEM;
3462         if (IS_SETLKW(cmd))
3463                 data->arg.block = 1;
3464         if (reclaim != 0)
3465                 data->arg.reclaim = 1;
3466         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3467                         &nfs4_lock_ops, data);
3468         if (IS_ERR(task))
3469                 return PTR_ERR(task);
3470         ret = nfs4_wait_for_completion_rpc_task(task);
3471         if (ret == 0) {
3472                 ret = data->rpc_status;
3473                 if (ret == -NFS4ERR_DENIED)
3474                         ret = -EAGAIN;
3475         } else
3476                 data->cancelled = 1;
3477         rpc_release_task(task);
3478         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3479         return ret;
3480 }
3481
3482 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3483 {
3484         struct nfs_server *server = NFS_SERVER(state->inode);
3485         struct nfs4_exception exception = { };
3486         int err;
3487
3488         do {
3489                 /* Cache the lock if possible... */
3490                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3491                         return 0;
3492                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3493                 if (err != -NFS4ERR_DELAY)
3494                         break;
3495                 nfs4_handle_exception(server, err, &exception);
3496         } while (exception.retry);
3497         return err;
3498 }
3499
3500 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3501 {
3502         struct nfs_server *server = NFS_SERVER(state->inode);
3503         struct nfs4_exception exception = { };
3504         int err;
3505
3506         err = nfs4_set_lock_state(state, request);
3507         if (err != 0)
3508                 return err;
3509         do {
3510                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3511                         return 0;
3512                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3513                 if (err != -NFS4ERR_DELAY)
3514                         break;
3515                 nfs4_handle_exception(server, err, &exception);
3516         } while (exception.retry);
3517         return err;
3518 }
3519
3520 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3521 {
3522         struct nfs_client *clp = state->owner->so_client;
3523         unsigned char fl_flags = request->fl_flags;
3524         int status;
3525
3526         /* Is this a delegated open? */
3527         status = nfs4_set_lock_state(state, request);
3528         if (status != 0)
3529                 goto out;
3530         request->fl_flags |= FL_ACCESS;
3531         status = do_vfs_lock(request->fl_file, request);
3532         if (status < 0)
3533                 goto out;
3534         down_read(&clp->cl_sem);
3535         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3536                 struct nfs_inode *nfsi = NFS_I(state->inode);
3537                 /* Yes: cache locks! */
3538                 down_read(&nfsi->rwsem);
3539                 /* ...but avoid races with delegation recall... */
3540                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3541                         request->fl_flags = fl_flags & ~FL_SLEEP;
3542                         status = do_vfs_lock(request->fl_file, request);
3543                         up_read(&nfsi->rwsem);
3544                         goto out_unlock;
3545                 }
3546                 up_read(&nfsi->rwsem);
3547         }
3548         status = _nfs4_do_setlk(state, cmd, request, 0);
3549         if (status != 0)
3550                 goto out_unlock;
3551         /* Note: we always want to sleep here! */
3552         request->fl_flags = fl_flags | FL_SLEEP;
3553         if (do_vfs_lock(request->fl_file, request) < 0)
3554                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3555 out_unlock:
3556         up_read(&clp->cl_sem);
3557 out:
3558         request->fl_flags = fl_flags;
3559         return status;
3560 }
3561
3562 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3563 {
3564         struct nfs4_exception exception = { };
3565         int err;
3566
3567         do {
3568                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3569                                 _nfs4_proc_setlk(state, cmd, request),
3570                                 &exception);
3571         } while (exception.retry);
3572         return err;
3573 }
3574
3575 static int
3576 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3577 {
3578         struct nfs_open_context *ctx;
3579         struct nfs4_state *state;
3580         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3581         int status;
3582
3583         /* verify open state */
3584         ctx = (struct nfs_open_context *)filp->private_data;
3585         state = ctx->state;
3586
3587         if (request->fl_start < 0 || request->fl_end < 0)
3588                 return -EINVAL;
3589
3590         if (IS_GETLK(cmd))
3591                 return nfs4_proc_getlk(state, F_GETLK, request);
3592
3593         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3594                 return -EINVAL;
3595
3596         if (request->fl_type == F_UNLCK)
3597                 return nfs4_proc_unlck(state, cmd, request);
3598
3599         do {
3600                 status = nfs4_proc_setlk(state, cmd, request);
3601                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3602                         break;
3603                 timeout = nfs4_set_lock_task_retry(timeout);
3604                 status = -ERESTARTSYS;
3605                 if (signalled())
3606                         break;
3607         } while(status < 0);
3608         return status;
3609 }
3610
3611 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3612 {
3613         struct nfs_server *server = NFS_SERVER(state->inode);
3614         struct nfs4_exception exception = { };
3615         int err;
3616
3617         err = nfs4_set_lock_state(state, fl);
3618         if (err != 0)
3619                 goto out;
3620         do {
3621                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3622                 if (err != -NFS4ERR_DELAY)
3623                         break;
3624                 err = nfs4_handle_exception(server, err, &exception);
3625         } while (exception.retry);
3626 out:
3627         return err;
3628 }
3629
3630 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3631
3632 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3633                 size_t buflen, int flags)
3634 {
3635         struct inode *inode = dentry->d_inode;
3636
3637         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3638                 return -EOPNOTSUPP;
3639
3640         if (!S_ISREG(inode->i_mode) &&
3641             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3642                 return -EPERM;
3643
3644         return nfs4_proc_set_acl(inode, buf, buflen);
3645 }
3646
3647 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3648  * and that's what we'll do for e.g. user attributes that haven't been set.
3649  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3650  * attributes in kernel-managed attribute namespaces. */
3651 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3652                 size_t buflen)
3653 {
3654         struct inode *inode = dentry->d_inode;
3655
3656         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3657                 return -EOPNOTSUPP;
3658
3659         return nfs4_proc_get_acl(inode, buf, buflen);
3660 }
3661
3662 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3663 {
3664         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3665
3666         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3667                 return 0;
3668         if (buf && buflen < len)
3669                 return -ERANGE;
3670         if (buf)
3671                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3672         return len;
3673 }
3674
3675 int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
3676                 struct nfs4_fs_locations *fs_locations, struct page *page)
3677 {
3678         struct nfs_server *server = NFS_SERVER(dir);
3679         u32 bitmask[2] = {
3680                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3681                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3682         };
3683         struct nfs4_fs_locations_arg args = {
3684                 .dir_fh = NFS_FH(dir),
3685                 .name = &dentry->d_name,
3686                 .page = page,
3687                 .bitmask = bitmask,
3688         };
3689         struct rpc_message msg = {
3690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3691                 .rpc_argp = &args,
3692                 .rpc_resp = fs_locations,
3693         };
3694         int status;
3695
3696         dprintk("%s: start\n", __FUNCTION__);
3697         fs_locations->fattr.valid = 0;
3698         fs_locations->server = server;
3699         fs_locations->nlocations = 0;
3700         status = rpc_call_sync(server->client, &msg, 0);
3701         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3702         return status;
3703 }
3704
3705 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3706         .recover_open   = nfs4_open_reclaim,
3707         .recover_lock   = nfs4_lock_reclaim,
3708 };
3709
3710 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3711         .recover_open   = nfs4_open_expired,
3712         .recover_lock   = nfs4_lock_expired,
3713 };
3714
3715 static struct inode_operations nfs4_file_inode_operations = {
3716         .permission     = nfs_permission,
3717         .getattr        = nfs_getattr,
3718         .setattr        = nfs_setattr,
3719         .getxattr       = nfs4_getxattr,
3720         .setxattr       = nfs4_setxattr,
3721         .listxattr      = nfs4_listxattr,
3722 };
3723
3724 const struct nfs_rpc_ops nfs_v4_clientops = {
3725         .version        = 4,                    /* protocol version */
3726         .dentry_ops     = &nfs4_dentry_operations,
3727         .dir_inode_ops  = &nfs4_dir_inode_operations,
3728         .file_inode_ops = &nfs4_file_inode_operations,
3729         .getroot        = nfs4_proc_get_root,
3730         .getattr        = nfs4_proc_getattr,
3731         .setattr        = nfs4_proc_setattr,
3732         .lookupfh       = nfs4_proc_lookupfh,
3733         .lookup         = nfs4_proc_lookup,
3734         .access         = nfs4_proc_access,
3735         .readlink       = nfs4_proc_readlink,
3736         .read           = nfs4_proc_read,
3737         .write          = nfs4_proc_write,
3738         .commit         = nfs4_proc_commit,
3739         .create         = nfs4_proc_create,
3740         .remove         = nfs4_proc_remove,
3741         .unlink_setup   = nfs4_proc_unlink_setup,
3742         .unlink_done    = nfs4_proc_unlink_done,
3743         .rename         = nfs4_proc_rename,
3744         .link           = nfs4_proc_link,
3745         .symlink        = nfs4_proc_symlink,
3746         .mkdir          = nfs4_proc_mkdir,
3747         .rmdir          = nfs4_proc_remove,
3748         .readdir        = nfs4_proc_readdir,
3749         .mknod          = nfs4_proc_mknod,
3750         .statfs         = nfs4_proc_statfs,
3751         .fsinfo         = nfs4_proc_fsinfo,
3752         .pathconf       = nfs4_proc_pathconf,
3753         .set_capabilities = nfs4_server_capabilities,
3754         .decode_dirent  = nfs4_decode_dirent,
3755         .read_setup     = nfs4_proc_read_setup,
3756         .read_done      = nfs4_read_done,
3757         .write_setup    = nfs4_proc_write_setup,
3758         .write_done     = nfs4_write_done,
3759         .commit_setup   = nfs4_proc_commit_setup,
3760         .commit_done    = nfs4_commit_done,
3761         .file_open      = nfs_open,
3762         .file_release   = nfs_release,
3763         .lock           = nfs4_proc_lock,
3764         .clear_acl_cache = nfs4_zap_acl_attr,
3765 };
3766
3767 /*
3768  * Local variables:
3769  *  c-basic-offset: 8
3770  * End:
3771  */