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, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, 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                         default:
1318                                 goto out_drop;
1319                 }
1320         }
1321         if (state->inode == dentry->d_inode) {
1322                 nfs4_intent_set_file(nd, dentry, state);
1323                 return 1;
1324         }
1325         nfs4_close_state(state, openflags);
1326 out_drop:
1327         d_drop(dentry);
1328         return 0;
1329 }
1330
1331
1332 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1333 {
1334         struct nfs4_server_caps_res res = {};
1335         struct rpc_message msg = {
1336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1337                 .rpc_argp = fhandle,
1338                 .rpc_resp = &res,
1339         };
1340         int status;
1341
1342         status = rpc_call_sync(server->client, &msg, 0);
1343         if (status == 0) {
1344                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1345                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1346                         server->caps |= NFS_CAP_ACLS;
1347                 if (res.has_links != 0)
1348                         server->caps |= NFS_CAP_HARDLINKS;
1349                 if (res.has_symlinks != 0)
1350                         server->caps |= NFS_CAP_SYMLINKS;
1351                 server->acl_bitmask = res.acl_bitmask;
1352         }
1353         return status;
1354 }
1355
1356 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1357 {
1358         struct nfs4_exception exception = { };
1359         int err;
1360         do {
1361                 err = nfs4_handle_exception(server,
1362                                 _nfs4_server_capabilities(server, fhandle),
1363                                 &exception);
1364         } while (exception.retry);
1365         return err;
1366 }
1367
1368 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1369                 struct nfs_fsinfo *info)
1370 {
1371         struct nfs4_lookup_root_arg args = {
1372                 .bitmask = nfs4_fattr_bitmap,
1373         };
1374         struct nfs4_lookup_res res = {
1375                 .server = server,
1376                 .fattr = info->fattr,
1377                 .fh = fhandle,
1378         };
1379         struct rpc_message msg = {
1380                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1381                 .rpc_argp = &args,
1382                 .rpc_resp = &res,
1383         };
1384         nfs_fattr_init(info->fattr);
1385         return rpc_call_sync(server->client, &msg, 0);
1386 }
1387
1388 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1389                 struct nfs_fsinfo *info)
1390 {
1391         struct nfs4_exception exception = { };
1392         int err;
1393         do {
1394                 err = nfs4_handle_exception(server,
1395                                 _nfs4_lookup_root(server, fhandle, info),
1396                                 &exception);
1397         } while (exception.retry);
1398         return err;
1399 }
1400
1401 /*
1402  * get the file handle for the "/" directory on the server
1403  */
1404 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1405                               struct nfs_fsinfo *info)
1406 {
1407         int status;
1408
1409         status = nfs4_lookup_root(server, fhandle, info);
1410         if (status == 0)
1411                 status = nfs4_server_capabilities(server, fhandle);
1412         if (status == 0)
1413                 status = nfs4_do_fsinfo(server, fhandle, info);
1414         return nfs4_map_errors(status);
1415 }
1416
1417 /*
1418  * Get locations and (maybe) other attributes of a referral.
1419  * Note that we'll actually follow the referral later when
1420  * we detect fsid mismatch in inode revalidation
1421  */
1422 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1423 {
1424         int status = -ENOMEM;
1425         struct page *page = NULL;
1426         struct nfs4_fs_locations *locations = NULL;
1427         struct dentry dentry = {};
1428
1429         page = alloc_page(GFP_KERNEL);
1430         if (page == NULL)
1431                 goto out;
1432         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1433         if (locations == NULL)
1434                 goto out;
1435
1436         dentry.d_name.name = name->name;
1437         dentry.d_name.len = name->len;
1438         status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1439         if (status != 0)
1440                 goto out;
1441         /* Make sure server returned a different fsid for the referral */
1442         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1443                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1444                 status = -EIO;
1445                 goto out;
1446         }
1447
1448         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1449         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1450         if (!fattr->mode)
1451                 fattr->mode = S_IFDIR;
1452         memset(fhandle, 0, sizeof(struct nfs_fh));
1453 out:
1454         if (page)
1455                 __free_page(page);
1456         if (locations)
1457                 kfree(locations);
1458         return status;
1459 }
1460
1461 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1462 {
1463         struct nfs4_getattr_arg args = {
1464                 .fh = fhandle,
1465                 .bitmask = server->attr_bitmask,
1466         };
1467         struct nfs4_getattr_res res = {
1468                 .fattr = fattr,
1469                 .server = server,
1470         };
1471         struct rpc_message msg = {
1472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1473                 .rpc_argp = &args,
1474                 .rpc_resp = &res,
1475         };
1476
1477         nfs_fattr_init(fattr);
1478         return rpc_call_sync(server->client, &msg, 0);
1479 }
1480
1481 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1482 {
1483         struct nfs4_exception exception = { };
1484         int err;
1485         do {
1486                 err = nfs4_handle_exception(server,
1487                                 _nfs4_proc_getattr(server, fhandle, fattr),
1488                                 &exception);
1489         } while (exception.retry);
1490         return err;
1491 }
1492
1493 /*
1494  * The file is not closed if it is opened due to the a request to change
1495  * the size of the file. The open call will not be needed once the
1496  * VFS layer lookup-intents are implemented.
1497  *
1498  * Close is called when the inode is destroyed.
1499  * If we haven't opened the file for O_WRONLY, we
1500  * need to in the size_change case to obtain a stateid.
1501  *
1502  * Got race?
1503  * Because OPEN is always done by name in nfsv4, it is
1504  * possible that we opened a different file by the same
1505  * name.  We can recognize this race condition, but we
1506  * can't do anything about it besides returning an error.
1507  *
1508  * This will be fixed with VFS changes (lookup-intent).
1509  */
1510 static int
1511 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1512                   struct iattr *sattr)
1513 {
1514         struct rpc_cred *cred;
1515         struct inode *inode = dentry->d_inode;
1516         struct nfs_open_context *ctx;
1517         struct nfs4_state *state = NULL;
1518         int status;
1519
1520         nfs_fattr_init(fattr);
1521
1522         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1523         if (IS_ERR(cred))
1524                 return PTR_ERR(cred);
1525
1526         /* Search for an existing open(O_WRITE) file */
1527         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1528         if (ctx != NULL)
1529                 state = ctx->state;
1530
1531         status = nfs4_do_setattr(inode, fattr, sattr, state);
1532         if (status == 0)
1533                 nfs_setattr_update_inode(inode, sattr);
1534         if (ctx != NULL)
1535                 put_nfs_open_context(ctx);
1536         put_rpccred(cred);
1537         return status;
1538 }
1539
1540 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1541                 struct qstr *name, struct nfs_fh *fhandle,
1542                 struct nfs_fattr *fattr)
1543 {
1544         int                    status;
1545         struct nfs4_lookup_arg args = {
1546                 .bitmask = server->attr_bitmask,
1547                 .dir_fh = dirfh,
1548                 .name = name,
1549         };
1550         struct nfs4_lookup_res res = {
1551                 .server = server,
1552                 .fattr = fattr,
1553                 .fh = fhandle,
1554         };
1555         struct rpc_message msg = {
1556                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1557                 .rpc_argp = &args,
1558                 .rpc_resp = &res,
1559         };
1560
1561         nfs_fattr_init(fattr);
1562
1563         dprintk("NFS call  lookupfh %s\n", name->name);
1564         status = rpc_call_sync(server->client, &msg, 0);
1565         dprintk("NFS reply lookupfh: %d\n", status);
1566         if (status == -NFS4ERR_MOVED)
1567                 status = -EREMOTE;
1568         return status;
1569 }
1570
1571 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1572                               struct qstr *name, struct nfs_fh *fhandle,
1573                               struct nfs_fattr *fattr)
1574 {
1575         struct nfs4_exception exception = { };
1576         int err;
1577         do {
1578                 err = nfs4_handle_exception(server,
1579                                 _nfs4_proc_lookupfh(server, dirfh, name,
1580                                                     fhandle, fattr),
1581                                 &exception);
1582         } while (exception.retry);
1583         return err;
1584 }
1585
1586 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1587                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1588 {
1589         int                    status;
1590         struct nfs_server *server = NFS_SERVER(dir);
1591         struct nfs4_lookup_arg args = {
1592                 .bitmask = server->attr_bitmask,
1593                 .dir_fh = NFS_FH(dir),
1594                 .name = name,
1595         };
1596         struct nfs4_lookup_res res = {
1597                 .server = server,
1598                 .fattr = fattr,
1599                 .fh = fhandle,
1600         };
1601         struct rpc_message msg = {
1602                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1603                 .rpc_argp = &args,
1604                 .rpc_resp = &res,
1605         };
1606
1607         nfs_fattr_init(fattr);
1608
1609         dprintk("NFS call  lookup %s\n", name->name);
1610         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1611         if (status == -NFS4ERR_MOVED)
1612                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1613         dprintk("NFS reply lookup: %d\n", status);
1614         return status;
1615 }
1616
1617 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1618 {
1619         struct nfs4_exception exception = { };
1620         int err;
1621         do {
1622                 err = nfs4_handle_exception(NFS_SERVER(dir),
1623                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1624                                 &exception);
1625         } while (exception.retry);
1626         return err;
1627 }
1628
1629 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1630 {
1631         struct nfs4_accessargs args = {
1632                 .fh = NFS_FH(inode),
1633         };
1634         struct nfs4_accessres res = { 0 };
1635         struct rpc_message msg = {
1636                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1637                 .rpc_argp = &args,
1638                 .rpc_resp = &res,
1639                 .rpc_cred = entry->cred,
1640         };
1641         int mode = entry->mask;
1642         int status;
1643
1644         /*
1645          * Determine which access bits we want to ask for...
1646          */
1647         if (mode & MAY_READ)
1648                 args.access |= NFS4_ACCESS_READ;
1649         if (S_ISDIR(inode->i_mode)) {
1650                 if (mode & MAY_WRITE)
1651                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1652                 if (mode & MAY_EXEC)
1653                         args.access |= NFS4_ACCESS_LOOKUP;
1654         } else {
1655                 if (mode & MAY_WRITE)
1656                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1657                 if (mode & MAY_EXEC)
1658                         args.access |= NFS4_ACCESS_EXECUTE;
1659         }
1660         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1661         if (!status) {
1662                 entry->mask = 0;
1663                 if (res.access & NFS4_ACCESS_READ)
1664                         entry->mask |= MAY_READ;
1665                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1666                         entry->mask |= MAY_WRITE;
1667                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1668                         entry->mask |= MAY_EXEC;
1669         }
1670         return status;
1671 }
1672
1673 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1674 {
1675         struct nfs4_exception exception = { };
1676         int err;
1677         do {
1678                 err = nfs4_handle_exception(NFS_SERVER(inode),
1679                                 _nfs4_proc_access(inode, entry),
1680                                 &exception);
1681         } while (exception.retry);
1682         return err;
1683 }
1684
1685 /*
1686  * TODO: For the time being, we don't try to get any attributes
1687  * along with any of the zero-copy operations READ, READDIR,
1688  * READLINK, WRITE.
1689  *
1690  * In the case of the first three, we want to put the GETATTR
1691  * after the read-type operation -- this is because it is hard
1692  * to predict the length of a GETATTR response in v4, and thus
1693  * align the READ data correctly.  This means that the GETATTR
1694  * may end up partially falling into the page cache, and we should
1695  * shift it into the 'tail' of the xdr_buf before processing.
1696  * To do this efficiently, we need to know the total length
1697  * of data received, which doesn't seem to be available outside
1698  * of the RPC layer.
1699  *
1700  * In the case of WRITE, we also want to put the GETATTR after
1701  * the operation -- in this case because we want to make sure
1702  * we get the post-operation mtime and size.  This means that
1703  * we can't use xdr_encode_pages() as written: we need a variant
1704  * of it which would leave room in the 'tail' iovec.
1705  *
1706  * Both of these changes to the XDR layer would in fact be quite
1707  * minor, but I decided to leave them for a subsequent patch.
1708  */
1709 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1710                 unsigned int pgbase, unsigned int pglen)
1711 {
1712         struct nfs4_readlink args = {
1713                 .fh       = NFS_FH(inode),
1714                 .pgbase   = pgbase,
1715                 .pglen    = pglen,
1716                 .pages    = &page,
1717         };
1718         struct rpc_message msg = {
1719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1720                 .rpc_argp = &args,
1721                 .rpc_resp = NULL,
1722         };
1723
1724         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1725 }
1726
1727 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1728                 unsigned int pgbase, unsigned int pglen)
1729 {
1730         struct nfs4_exception exception = { };
1731         int err;
1732         do {
1733                 err = nfs4_handle_exception(NFS_SERVER(inode),
1734                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1735                                 &exception);
1736         } while (exception.retry);
1737         return err;
1738 }
1739
1740 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1741 {
1742         int flags = rdata->flags;
1743         struct inode *inode = rdata->inode;
1744         struct nfs_fattr *fattr = rdata->res.fattr;
1745         struct nfs_server *server = NFS_SERVER(inode);
1746         struct rpc_message msg = {
1747                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1748                 .rpc_argp       = &rdata->args,
1749                 .rpc_resp       = &rdata->res,
1750                 .rpc_cred       = rdata->cred,
1751         };
1752         unsigned long timestamp = jiffies;
1753         int status;
1754
1755         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1756                         (long long) rdata->args.offset);
1757
1758         nfs_fattr_init(fattr);
1759         status = rpc_call_sync(server->client, &msg, flags);
1760         if (!status)
1761                 renew_lease(server, timestamp);
1762         dprintk("NFS reply read: %d\n", status);
1763         return status;
1764 }
1765
1766 static int nfs4_proc_read(struct nfs_read_data *rdata)
1767 {
1768         struct nfs4_exception exception = { };
1769         int err;
1770         do {
1771                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1772                                 _nfs4_proc_read(rdata),
1773                                 &exception);
1774         } while (exception.retry);
1775         return err;
1776 }
1777
1778 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1779 {
1780         int rpcflags = wdata->flags;
1781         struct inode *inode = wdata->inode;
1782         struct nfs_fattr *fattr = wdata->res.fattr;
1783         struct nfs_server *server = NFS_SERVER(inode);
1784         struct rpc_message msg = {
1785                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1786                 .rpc_argp       = &wdata->args,
1787                 .rpc_resp       = &wdata->res,
1788                 .rpc_cred       = wdata->cred,
1789         };
1790         int status;
1791
1792         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1793                         (long long) wdata->args.offset);
1794
1795         wdata->args.bitmask = server->attr_bitmask;
1796         wdata->res.server = server;
1797         wdata->timestamp = jiffies;
1798         nfs_fattr_init(fattr);
1799         status = rpc_call_sync(server->client, &msg, rpcflags);
1800         dprintk("NFS reply write: %d\n", status);
1801         if (status < 0)
1802                 return status;
1803         renew_lease(server, wdata->timestamp);
1804         nfs_post_op_update_inode(inode, fattr);
1805         return wdata->res.count;
1806 }
1807
1808 static int nfs4_proc_write(struct nfs_write_data *wdata)
1809 {
1810         struct nfs4_exception exception = { };
1811         int err;
1812         do {
1813                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1814                                 _nfs4_proc_write(wdata),
1815                                 &exception);
1816         } while (exception.retry);
1817         return err;
1818 }
1819
1820 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1821 {
1822         struct inode *inode = cdata->inode;
1823         struct nfs_fattr *fattr = cdata->res.fattr;
1824         struct nfs_server *server = NFS_SERVER(inode);
1825         struct rpc_message msg = {
1826                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1827                 .rpc_argp       = &cdata->args,
1828                 .rpc_resp       = &cdata->res,
1829                 .rpc_cred       = cdata->cred,
1830         };
1831         int status;
1832
1833         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1834                         (long long) cdata->args.offset);
1835
1836         cdata->args.bitmask = server->attr_bitmask;
1837         cdata->res.server = server;
1838         cdata->timestamp = jiffies;
1839         nfs_fattr_init(fattr);
1840         status = rpc_call_sync(server->client, &msg, 0);
1841         if (status >= 0)
1842                 renew_lease(server, cdata->timestamp);
1843         dprintk("NFS reply commit: %d\n", status);
1844         if (status >= 0)
1845                 nfs_post_op_update_inode(inode, fattr);
1846         return status;
1847 }
1848
1849 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1850 {
1851         struct nfs4_exception exception = { };
1852         int err;
1853         do {
1854                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1855                                 _nfs4_proc_commit(cdata),
1856                                 &exception);
1857         } while (exception.retry);
1858         return err;
1859 }
1860
1861 /*
1862  * Got race?
1863  * We will need to arrange for the VFS layer to provide an atomic open.
1864  * Until then, this create/open method is prone to inefficiency and race
1865  * conditions due to the lookup, create, and open VFS calls from sys_open()
1866  * placed on the wire.
1867  *
1868  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1869  * The file will be opened again in the subsequent VFS open call
1870  * (nfs4_proc_file_open).
1871  *
1872  * The open for read will just hang around to be used by any process that
1873  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1874  */
1875
1876 static int
1877 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1878                  int flags, struct nameidata *nd)
1879 {
1880         struct nfs4_state *state;
1881         struct rpc_cred *cred;
1882         int status = 0;
1883
1884         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1885         if (IS_ERR(cred)) {
1886                 status = PTR_ERR(cred);
1887                 goto out;
1888         }
1889         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1890         put_rpccred(cred);
1891         if (IS_ERR(state)) {
1892                 status = PTR_ERR(state);
1893                 goto out;
1894         }
1895         d_instantiate(dentry, igrab(state->inode));
1896         if (flags & O_EXCL) {
1897                 struct nfs_fattr fattr;
1898                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1899                 if (status == 0)
1900                         nfs_setattr_update_inode(state->inode, sattr);
1901         }
1902         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1903                 status = nfs4_intent_set_file(nd, dentry, state);
1904         else
1905                 nfs4_close_state(state, flags);
1906 out:
1907         return status;
1908 }
1909
1910 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1911 {
1912         struct nfs_server *server = NFS_SERVER(dir);
1913         struct nfs4_remove_arg args = {
1914                 .fh = NFS_FH(dir),
1915                 .name = name,
1916                 .bitmask = server->attr_bitmask,
1917         };
1918         struct nfs_fattr dir_attr;
1919         struct nfs4_remove_res  res = {
1920                 .server = server,
1921                 .dir_attr = &dir_attr,
1922         };
1923         struct rpc_message msg = {
1924                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1925                 .rpc_argp       = &args,
1926                 .rpc_resp       = &res,
1927         };
1928         int                     status;
1929
1930         nfs_fattr_init(res.dir_attr);
1931         status = rpc_call_sync(server->client, &msg, 0);
1932         if (status == 0) {
1933                 update_changeattr(dir, &res.cinfo);
1934                 nfs_post_op_update_inode(dir, res.dir_attr);
1935         }
1936         return status;
1937 }
1938
1939 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1940 {
1941         struct nfs4_exception exception = { };
1942         int err;
1943         do {
1944                 err = nfs4_handle_exception(NFS_SERVER(dir),
1945                                 _nfs4_proc_remove(dir, name),
1946                                 &exception);
1947         } while (exception.retry);
1948         return err;
1949 }
1950
1951 struct unlink_desc {
1952         struct nfs4_remove_arg  args;
1953         struct nfs4_remove_res  res;
1954         struct nfs_fattr dir_attr;
1955 };
1956
1957 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1958                 struct qstr *name)
1959 {
1960         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1961         struct unlink_desc *up;
1962
1963         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1964         if (!up)
1965                 return -ENOMEM;
1966
1967         up->args.fh = NFS_FH(dir->d_inode);
1968         up->args.name = name;
1969         up->args.bitmask = server->attr_bitmask;
1970         up->res.server = server;
1971         up->res.dir_attr = &up->dir_attr;
1972
1973         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1974         msg->rpc_argp = &up->args;
1975         msg->rpc_resp = &up->res;
1976         return 0;
1977 }
1978
1979 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1980 {
1981         struct rpc_message *msg = &task->tk_msg;
1982         struct unlink_desc *up;
1983
1984         if (msg->rpc_resp != NULL) {
1985                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1986                 update_changeattr(dir->d_inode, &up->res.cinfo);
1987                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1988                 kfree(up);
1989                 msg->rpc_resp = NULL;
1990                 msg->rpc_argp = NULL;
1991         }
1992         return 0;
1993 }
1994
1995 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1996                 struct inode *new_dir, struct qstr *new_name)
1997 {
1998         struct nfs_server *server = NFS_SERVER(old_dir);
1999         struct nfs4_rename_arg arg = {
2000                 .old_dir = NFS_FH(old_dir),
2001                 .new_dir = NFS_FH(new_dir),
2002                 .old_name = old_name,
2003                 .new_name = new_name,
2004                 .bitmask = server->attr_bitmask,
2005         };
2006         struct nfs_fattr old_fattr, new_fattr;
2007         struct nfs4_rename_res res = {
2008                 .server = server,
2009                 .old_fattr = &old_fattr,
2010                 .new_fattr = &new_fattr,
2011         };
2012         struct rpc_message msg = {
2013                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2014                 .rpc_argp = &arg,
2015                 .rpc_resp = &res,
2016         };
2017         int                     status;
2018
2019         nfs_fattr_init(res.old_fattr);
2020         nfs_fattr_init(res.new_fattr);
2021         status = rpc_call_sync(server->client, &msg, 0);
2022
2023         if (!status) {
2024                 update_changeattr(old_dir, &res.old_cinfo);
2025                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2026                 update_changeattr(new_dir, &res.new_cinfo);
2027                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2028         }
2029         return status;
2030 }
2031
2032 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2033                 struct inode *new_dir, struct qstr *new_name)
2034 {
2035         struct nfs4_exception exception = { };
2036         int err;
2037         do {
2038                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2039                                 _nfs4_proc_rename(old_dir, old_name,
2040                                         new_dir, new_name),
2041                                 &exception);
2042         } while (exception.retry);
2043         return err;
2044 }
2045
2046 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2047 {
2048         struct nfs_server *server = NFS_SERVER(inode);
2049         struct nfs4_link_arg arg = {
2050                 .fh     = NFS_FH(inode),
2051                 .dir_fh = NFS_FH(dir),
2052                 .name   = name,
2053                 .bitmask = server->attr_bitmask,
2054         };
2055         struct nfs_fattr fattr, dir_attr;
2056         struct nfs4_link_res res = {
2057                 .server = server,
2058                 .fattr = &fattr,
2059                 .dir_attr = &dir_attr,
2060         };
2061         struct rpc_message msg = {
2062                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2063                 .rpc_argp = &arg,
2064                 .rpc_resp = &res,
2065         };
2066         int                     status;
2067
2068         nfs_fattr_init(res.fattr);
2069         nfs_fattr_init(res.dir_attr);
2070         status = rpc_call_sync(server->client, &msg, 0);
2071         if (!status) {
2072                 update_changeattr(dir, &res.cinfo);
2073                 nfs_post_op_update_inode(dir, res.dir_attr);
2074                 nfs_post_op_update_inode(inode, res.fattr);
2075         }
2076
2077         return status;
2078 }
2079
2080 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2081 {
2082         struct nfs4_exception exception = { };
2083         int err;
2084         do {
2085                 err = nfs4_handle_exception(NFS_SERVER(inode),
2086                                 _nfs4_proc_link(inode, dir, name),
2087                                 &exception);
2088         } while (exception.retry);
2089         return err;
2090 }
2091
2092 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2093                 struct page *page, unsigned int len, struct iattr *sattr)
2094 {
2095         struct nfs_server *server = NFS_SERVER(dir);
2096         struct nfs_fh fhandle;
2097         struct nfs_fattr fattr, dir_fattr;
2098         struct nfs4_create_arg arg = {
2099                 .dir_fh = NFS_FH(dir),
2100                 .server = server,
2101                 .name = &dentry->d_name,
2102                 .attrs = sattr,
2103                 .ftype = NF4LNK,
2104                 .bitmask = server->attr_bitmask,
2105         };
2106         struct nfs4_create_res res = {
2107                 .server = server,
2108                 .fh = &fhandle,
2109                 .fattr = &fattr,
2110                 .dir_fattr = &dir_fattr,
2111         };
2112         struct rpc_message msg = {
2113                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2114                 .rpc_argp = &arg,
2115                 .rpc_resp = &res,
2116         };
2117         int                     status;
2118
2119         if (len > NFS4_MAXPATHLEN)
2120                 return -ENAMETOOLONG;
2121
2122         arg.u.symlink.pages = &page;
2123         arg.u.symlink.len = len;
2124         nfs_fattr_init(&fattr);
2125         nfs_fattr_init(&dir_fattr);
2126
2127         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2128         if (!status) {
2129                 update_changeattr(dir, &res.dir_cinfo);
2130                 nfs_post_op_update_inode(dir, res.dir_fattr);
2131                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2132         }
2133         return status;
2134 }
2135
2136 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2137                 struct page *page, unsigned int len, struct iattr *sattr)
2138 {
2139         struct nfs4_exception exception = { };
2140         int err;
2141         do {
2142                 err = nfs4_handle_exception(NFS_SERVER(dir),
2143                                 _nfs4_proc_symlink(dir, dentry, page,
2144                                                         len, sattr),
2145                                 &exception);
2146         } while (exception.retry);
2147         return err;
2148 }
2149
2150 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2151                 struct iattr *sattr)
2152 {
2153         struct nfs_server *server = NFS_SERVER(dir);
2154         struct nfs_fh fhandle;
2155         struct nfs_fattr fattr, dir_fattr;
2156         struct nfs4_create_arg arg = {
2157                 .dir_fh = NFS_FH(dir),
2158                 .server = server,
2159                 .name = &dentry->d_name,
2160                 .attrs = sattr,
2161                 .ftype = NF4DIR,
2162                 .bitmask = server->attr_bitmask,
2163         };
2164         struct nfs4_create_res res = {
2165                 .server = server,
2166                 .fh = &fhandle,
2167                 .fattr = &fattr,
2168                 .dir_fattr = &dir_fattr,
2169         };
2170         struct rpc_message msg = {
2171                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2172                 .rpc_argp = &arg,
2173                 .rpc_resp = &res,
2174         };
2175         int                     status;
2176
2177         nfs_fattr_init(&fattr);
2178         nfs_fattr_init(&dir_fattr);
2179
2180         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2181         if (!status) {
2182                 update_changeattr(dir, &res.dir_cinfo);
2183                 nfs_post_op_update_inode(dir, res.dir_fattr);
2184                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2185         }
2186         return status;
2187 }
2188
2189 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2190                 struct iattr *sattr)
2191 {
2192         struct nfs4_exception exception = { };
2193         int err;
2194         do {
2195                 err = nfs4_handle_exception(NFS_SERVER(dir),
2196                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2197                                 &exception);
2198         } while (exception.retry);
2199         return err;
2200 }
2201
2202 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2203                   u64 cookie, struct page *page, unsigned int count, int plus)
2204 {
2205         struct inode            *dir = dentry->d_inode;
2206         struct nfs4_readdir_arg args = {
2207                 .fh = NFS_FH(dir),
2208                 .pages = &page,
2209                 .pgbase = 0,
2210                 .count = count,
2211                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2212         };
2213         struct nfs4_readdir_res res;
2214         struct rpc_message msg = {
2215                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2216                 .rpc_argp = &args,
2217                 .rpc_resp = &res,
2218                 .rpc_cred = cred,
2219         };
2220         int                     status;
2221
2222         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2223                         dentry->d_parent->d_name.name,
2224                         dentry->d_name.name,
2225                         (unsigned long long)cookie);
2226         lock_kernel();
2227         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2228         res.pgbase = args.pgbase;
2229         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2230         if (status == 0)
2231                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2232         unlock_kernel();
2233         dprintk("%s: returns %d\n", __FUNCTION__, status);
2234         return status;
2235 }
2236
2237 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2238                   u64 cookie, struct page *page, unsigned int count, int plus)
2239 {
2240         struct nfs4_exception exception = { };
2241         int err;
2242         do {
2243                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2244                                 _nfs4_proc_readdir(dentry, cred, cookie,
2245                                         page, count, plus),
2246                                 &exception);
2247         } while (exception.retry);
2248         return err;
2249 }
2250
2251 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2252                 struct iattr *sattr, dev_t rdev)
2253 {
2254         struct nfs_server *server = NFS_SERVER(dir);
2255         struct nfs_fh fh;
2256         struct nfs_fattr fattr, dir_fattr;
2257         struct nfs4_create_arg arg = {
2258                 .dir_fh = NFS_FH(dir),
2259                 .server = server,
2260                 .name = &dentry->d_name,
2261                 .attrs = sattr,
2262                 .bitmask = server->attr_bitmask,
2263         };
2264         struct nfs4_create_res res = {
2265                 .server = server,
2266                 .fh = &fh,
2267                 .fattr = &fattr,
2268                 .dir_fattr = &dir_fattr,
2269         };
2270         struct rpc_message msg = {
2271                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2272                 .rpc_argp = &arg,
2273                 .rpc_resp = &res,
2274         };
2275         int                     status;
2276         int                     mode = sattr->ia_mode;
2277
2278         nfs_fattr_init(&fattr);
2279         nfs_fattr_init(&dir_fattr);
2280
2281         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2282         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2283         if (S_ISFIFO(mode))
2284                 arg.ftype = NF4FIFO;
2285         else if (S_ISBLK(mode)) {
2286                 arg.ftype = NF4BLK;
2287                 arg.u.device.specdata1 = MAJOR(rdev);
2288                 arg.u.device.specdata2 = MINOR(rdev);
2289         }
2290         else if (S_ISCHR(mode)) {
2291                 arg.ftype = NF4CHR;
2292                 arg.u.device.specdata1 = MAJOR(rdev);
2293                 arg.u.device.specdata2 = MINOR(rdev);
2294         }
2295         else
2296                 arg.ftype = NF4SOCK;
2297
2298         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2299         if (status == 0) {
2300                 update_changeattr(dir, &res.dir_cinfo);
2301                 nfs_post_op_update_inode(dir, res.dir_fattr);
2302                 status = nfs_instantiate(dentry, &fh, &fattr);
2303         }
2304         return status;
2305 }
2306
2307 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2308                 struct iattr *sattr, dev_t rdev)
2309 {
2310         struct nfs4_exception exception = { };
2311         int err;
2312         do {
2313                 err = nfs4_handle_exception(NFS_SERVER(dir),
2314                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2315                                 &exception);
2316         } while (exception.retry);
2317         return err;
2318 }
2319
2320 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2321                  struct nfs_fsstat *fsstat)
2322 {
2323         struct nfs4_statfs_arg args = {
2324                 .fh = fhandle,
2325                 .bitmask = server->attr_bitmask,
2326         };
2327         struct rpc_message msg = {
2328                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2329                 .rpc_argp = &args,
2330                 .rpc_resp = fsstat,
2331         };
2332
2333         nfs_fattr_init(fsstat->fattr);
2334         return rpc_call_sync(server->client, &msg, 0);
2335 }
2336
2337 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2338 {
2339         struct nfs4_exception exception = { };
2340         int err;
2341         do {
2342                 err = nfs4_handle_exception(server,
2343                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2344                                 &exception);
2345         } while (exception.retry);
2346         return err;
2347 }
2348
2349 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2350                 struct nfs_fsinfo *fsinfo)
2351 {
2352         struct nfs4_fsinfo_arg args = {
2353                 .fh = fhandle,
2354                 .bitmask = server->attr_bitmask,
2355         };
2356         struct rpc_message msg = {
2357                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2358                 .rpc_argp = &args,
2359                 .rpc_resp = fsinfo,
2360         };
2361
2362         return rpc_call_sync(server->client, &msg, 0);
2363 }
2364
2365 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2366 {
2367         struct nfs4_exception exception = { };
2368         int err;
2369
2370         do {
2371                 err = nfs4_handle_exception(server,
2372                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2373                                 &exception);
2374         } while (exception.retry);
2375         return err;
2376 }
2377
2378 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2379 {
2380         nfs_fattr_init(fsinfo->fattr);
2381         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2382 }
2383
2384 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2385                 struct nfs_pathconf *pathconf)
2386 {
2387         struct nfs4_pathconf_arg args = {
2388                 .fh = fhandle,
2389                 .bitmask = server->attr_bitmask,
2390         };
2391         struct rpc_message msg = {
2392                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2393                 .rpc_argp = &args,
2394                 .rpc_resp = pathconf,
2395         };
2396
2397         /* None of the pathconf attributes are mandatory to implement */
2398         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2399                 memset(pathconf, 0, sizeof(*pathconf));
2400                 return 0;
2401         }
2402
2403         nfs_fattr_init(pathconf->fattr);
2404         return rpc_call_sync(server->client, &msg, 0);
2405 }
2406
2407 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2408                 struct nfs_pathconf *pathconf)
2409 {
2410         struct nfs4_exception exception = { };
2411         int err;
2412
2413         do {
2414                 err = nfs4_handle_exception(server,
2415                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2416                                 &exception);
2417         } while (exception.retry);
2418         return err;
2419 }
2420
2421 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2422 {
2423         struct nfs_server *server = NFS_SERVER(data->inode);
2424
2425         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2426                 rpc_restart_call(task);
2427                 return -EAGAIN;
2428         }
2429         if (task->tk_status > 0)
2430                 renew_lease(server, data->timestamp);
2431         return 0;
2432 }
2433
2434 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2435 {
2436         struct rpc_message msg = {
2437                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2438                 .rpc_argp = &data->args,
2439                 .rpc_resp = &data->res,
2440                 .rpc_cred = data->cred,
2441         };
2442
2443         data->timestamp   = jiffies;
2444
2445         rpc_call_setup(&data->task, &msg, 0);
2446 }
2447
2448 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2449 {
2450         struct inode *inode = data->inode;
2451
2452         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2453                 rpc_restart_call(task);
2454                 return -EAGAIN;
2455         }
2456         if (task->tk_status >= 0) {
2457                 renew_lease(NFS_SERVER(inode), data->timestamp);
2458                 nfs_post_op_update_inode(inode, data->res.fattr);
2459         }
2460         return 0;
2461 }
2462
2463 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2464 {
2465         struct rpc_message msg = {
2466                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2467                 .rpc_argp = &data->args,
2468                 .rpc_resp = &data->res,
2469                 .rpc_cred = data->cred,
2470         };
2471         struct inode *inode = data->inode;
2472         struct nfs_server *server = NFS_SERVER(inode);
2473         int stable;
2474
2475         if (how & FLUSH_STABLE) {
2476                 if (!NFS_I(inode)->ncommit)
2477                         stable = NFS_FILE_SYNC;
2478                 else
2479                         stable = NFS_DATA_SYNC;
2480         } else
2481                 stable = NFS_UNSTABLE;
2482         data->args.stable = stable;
2483         data->args.bitmask = server->attr_bitmask;
2484         data->res.server = server;
2485
2486         data->timestamp   = jiffies;
2487
2488         /* Finalize the task. */
2489         rpc_call_setup(&data->task, &msg, 0);
2490 }
2491
2492 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2493 {
2494         struct inode *inode = data->inode;
2495
2496         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2497                 rpc_restart_call(task);
2498                 return -EAGAIN;
2499         }
2500         if (task->tk_status >= 0)
2501                 nfs_post_op_update_inode(inode, data->res.fattr);
2502         return 0;
2503 }
2504
2505 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2506 {
2507         struct rpc_message msg = {
2508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2509                 .rpc_argp = &data->args,
2510                 .rpc_resp = &data->res,
2511                 .rpc_cred = data->cred,
2512         };
2513         struct nfs_server *server = NFS_SERVER(data->inode);
2514
2515         data->args.bitmask = server->attr_bitmask;
2516         data->res.server = server;
2517
2518         rpc_call_setup(&data->task, &msg, 0);
2519 }
2520
2521 /*
2522  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2523  * standalone procedure for queueing an asynchronous RENEW.
2524  */
2525 static void nfs4_renew_done(struct rpc_task *task, void *data)
2526 {
2527         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2528         unsigned long timestamp = (unsigned long)data;
2529
2530         if (task->tk_status < 0) {
2531                 switch (task->tk_status) {
2532                         case -NFS4ERR_STALE_CLIENTID:
2533                         case -NFS4ERR_EXPIRED:
2534                         case -NFS4ERR_CB_PATH_DOWN:
2535                                 nfs4_schedule_state_recovery(clp);
2536                 }
2537                 return;
2538         }
2539         spin_lock(&clp->cl_lock);
2540         if (time_before(clp->cl_last_renewal,timestamp))
2541                 clp->cl_last_renewal = timestamp;
2542         spin_unlock(&clp->cl_lock);
2543 }
2544
2545 static const struct rpc_call_ops nfs4_renew_ops = {
2546         .rpc_call_done = nfs4_renew_done,
2547 };
2548
2549 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2550 {
2551         struct rpc_message msg = {
2552                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2553                 .rpc_argp       = clp,
2554                 .rpc_cred       = cred,
2555         };
2556
2557         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2558                         &nfs4_renew_ops, (void *)jiffies);
2559 }
2560
2561 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2562 {
2563         struct rpc_message msg = {
2564                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2565                 .rpc_argp       = clp,
2566                 .rpc_cred       = cred,
2567         };
2568         unsigned long now = jiffies;
2569         int status;
2570
2571         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2572         if (status < 0)
2573                 return status;
2574         spin_lock(&clp->cl_lock);
2575         if (time_before(clp->cl_last_renewal,now))
2576                 clp->cl_last_renewal = now;
2577         spin_unlock(&clp->cl_lock);
2578         return 0;
2579 }
2580
2581 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2582 {
2583         return (server->caps & NFS_CAP_ACLS)
2584                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2585                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2586 }
2587
2588 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2589  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2590  * the stack.
2591  */
2592 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2593
2594 static void buf_to_pages(const void *buf, size_t buflen,
2595                 struct page **pages, unsigned int *pgbase)
2596 {
2597         const void *p = buf;
2598
2599         *pgbase = offset_in_page(buf);
2600         p -= *pgbase;
2601         while (p < buf + buflen) {
2602                 *(pages++) = virt_to_page(p);
2603                 p += PAGE_CACHE_SIZE;
2604         }
2605 }
2606
2607 struct nfs4_cached_acl {
2608         int cached;
2609         size_t len;
2610         char data[0];
2611 };
2612
2613 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2614 {
2615         struct nfs_inode *nfsi = NFS_I(inode);
2616
2617         spin_lock(&inode->i_lock);
2618         kfree(nfsi->nfs4_acl);
2619         nfsi->nfs4_acl = acl;
2620         spin_unlock(&inode->i_lock);
2621 }
2622
2623 static void nfs4_zap_acl_attr(struct inode *inode)
2624 {
2625         nfs4_set_cached_acl(inode, NULL);
2626 }
2627
2628 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2629 {
2630         struct nfs_inode *nfsi = NFS_I(inode);
2631         struct nfs4_cached_acl *acl;
2632         int ret = -ENOENT;
2633
2634         spin_lock(&inode->i_lock);
2635         acl = nfsi->nfs4_acl;
2636         if (acl == NULL)
2637                 goto out;
2638         if (buf == NULL) /* user is just asking for length */
2639                 goto out_len;
2640         if (acl->cached == 0)
2641                 goto out;
2642         ret = -ERANGE; /* see getxattr(2) man page */
2643         if (acl->len > buflen)
2644                 goto out;
2645         memcpy(buf, acl->data, acl->len);
2646 out_len:
2647         ret = acl->len;
2648 out:
2649         spin_unlock(&inode->i_lock);
2650         return ret;
2651 }
2652
2653 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2654 {
2655         struct nfs4_cached_acl *acl;
2656
2657         if (buf && acl_len <= PAGE_SIZE) {
2658                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2659                 if (acl == NULL)
2660                         goto out;
2661                 acl->cached = 1;
2662                 memcpy(acl->data, buf, acl_len);
2663         } else {
2664                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2665                 if (acl == NULL)
2666                         goto out;
2667                 acl->cached = 0;
2668         }
2669         acl->len = acl_len;
2670 out:
2671         nfs4_set_cached_acl(inode, acl);
2672 }
2673
2674 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2675 {
2676         struct page *pages[NFS4ACL_MAXPAGES];
2677         struct nfs_getaclargs args = {
2678                 .fh = NFS_FH(inode),
2679                 .acl_pages = pages,
2680                 .acl_len = buflen,
2681         };
2682         size_t resp_len = buflen;
2683         void *resp_buf;
2684         struct rpc_message msg = {
2685                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2686                 .rpc_argp = &args,
2687                 .rpc_resp = &resp_len,
2688         };
2689         struct page *localpage = NULL;
2690         int ret;
2691
2692         if (buflen < PAGE_SIZE) {
2693                 /* As long as we're doing a round trip to the server anyway,
2694                  * let's be prepared for a page of acl data. */
2695                 localpage = alloc_page(GFP_KERNEL);
2696                 resp_buf = page_address(localpage);
2697                 if (localpage == NULL)
2698                         return -ENOMEM;
2699                 args.acl_pages[0] = localpage;
2700                 args.acl_pgbase = 0;
2701                 resp_len = args.acl_len = PAGE_SIZE;
2702         } else {
2703                 resp_buf = buf;
2704                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2705         }
2706         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2707         if (ret)
2708                 goto out_free;
2709         if (resp_len > args.acl_len)
2710                 nfs4_write_cached_acl(inode, NULL, resp_len);
2711         else
2712                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2713         if (buf) {
2714                 ret = -ERANGE;
2715                 if (resp_len > buflen)
2716                         goto out_free;
2717                 if (localpage)
2718                         memcpy(buf, resp_buf, resp_len);
2719         }
2720         ret = resp_len;
2721 out_free:
2722         if (localpage)
2723                 __free_page(localpage);
2724         return ret;
2725 }
2726
2727 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2728 {
2729         struct nfs4_exception exception = { };
2730         ssize_t ret;
2731         do {
2732                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2733                 if (ret >= 0)
2734                         break;
2735                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2736         } while (exception.retry);
2737         return ret;
2738 }
2739
2740 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2741 {
2742         struct nfs_server *server = NFS_SERVER(inode);
2743         int ret;
2744
2745         if (!nfs4_server_supports_acls(server))
2746                 return -EOPNOTSUPP;
2747         ret = nfs_revalidate_inode(server, inode);
2748         if (ret < 0)
2749                 return ret;
2750         ret = nfs4_read_cached_acl(inode, buf, buflen);
2751         if (ret != -ENOENT)
2752                 return ret;
2753         return nfs4_get_acl_uncached(inode, buf, buflen);
2754 }
2755
2756 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2757 {
2758         struct nfs_server *server = NFS_SERVER(inode);
2759         struct page *pages[NFS4ACL_MAXPAGES];
2760         struct nfs_setaclargs arg = {
2761                 .fh             = NFS_FH(inode),
2762                 .acl_pages      = pages,
2763                 .acl_len        = buflen,
2764         };
2765         struct rpc_message msg = {
2766                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2767                 .rpc_argp       = &arg,
2768                 .rpc_resp       = NULL,
2769         };
2770         int ret;
2771
2772         if (!nfs4_server_supports_acls(server))
2773                 return -EOPNOTSUPP;
2774         nfs_inode_return_delegation(inode);
2775         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2776         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2777         if (ret == 0)
2778                 nfs4_write_cached_acl(inode, buf, buflen);
2779         return ret;
2780 }
2781
2782 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2783 {
2784         struct nfs4_exception exception = { };
2785         int err;
2786         do {
2787                 err = nfs4_handle_exception(NFS_SERVER(inode),
2788                                 __nfs4_proc_set_acl(inode, buf, buflen),
2789                                 &exception);
2790         } while (exception.retry);
2791         return err;
2792 }
2793
2794 static int
2795 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2796 {
2797         struct nfs_client *clp = server->nfs_client;
2798
2799         if (!clp || task->tk_status >= 0)
2800                 return 0;
2801         switch(task->tk_status) {
2802                 case -NFS4ERR_STALE_CLIENTID:
2803                 case -NFS4ERR_STALE_STATEID:
2804                 case -NFS4ERR_EXPIRED:
2805                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2806                         nfs4_schedule_state_recovery(clp);
2807                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2808                                 rpc_wake_up_task(task);
2809                         task->tk_status = 0;
2810                         return -EAGAIN;
2811                 case -NFS4ERR_DELAY:
2812                         nfs_inc_server_stats((struct nfs_server *) server,
2813                                                 NFSIOS_DELAY);
2814                 case -NFS4ERR_GRACE:
2815                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2816                         task->tk_status = 0;
2817                         return -EAGAIN;
2818                 case -NFS4ERR_OLD_STATEID:
2819                         task->tk_status = 0;
2820                         return -EAGAIN;
2821         }
2822         task->tk_status = nfs4_map_errors(task->tk_status);
2823         return 0;
2824 }
2825
2826 static int nfs4_wait_bit_interruptible(void *word)
2827 {
2828         if (signal_pending(current))
2829                 return -ERESTARTSYS;
2830         schedule();
2831         return 0;
2832 }
2833
2834 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2835 {
2836         sigset_t oldset;
2837         int res;
2838
2839         might_sleep();
2840
2841         rpc_clnt_sigmask(clnt, &oldset);
2842         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2843                         nfs4_wait_bit_interruptible,
2844                         TASK_INTERRUPTIBLE);
2845         rpc_clnt_sigunmask(clnt, &oldset);
2846         return res;
2847 }
2848
2849 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2850 {
2851         sigset_t oldset;
2852         int res = 0;
2853
2854         might_sleep();
2855
2856         if (*timeout <= 0)
2857                 *timeout = NFS4_POLL_RETRY_MIN;
2858         if (*timeout > NFS4_POLL_RETRY_MAX)
2859                 *timeout = NFS4_POLL_RETRY_MAX;
2860         rpc_clnt_sigmask(clnt, &oldset);
2861         if (clnt->cl_intr) {
2862                 schedule_timeout_interruptible(*timeout);
2863                 if (signalled())
2864                         res = -ERESTARTSYS;
2865         } else
2866                 schedule_timeout_uninterruptible(*timeout);
2867         rpc_clnt_sigunmask(clnt, &oldset);
2868         *timeout <<= 1;
2869         return res;
2870 }
2871
2872 /* This is the error handling routine for processes that are allowed
2873  * to sleep.
2874  */
2875 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2876 {
2877         struct nfs_client *clp = server->nfs_client;
2878         int ret = errorcode;
2879
2880         exception->retry = 0;
2881         switch(errorcode) {
2882                 case 0:
2883                         return 0;
2884                 case -NFS4ERR_STALE_CLIENTID:
2885                 case -NFS4ERR_STALE_STATEID:
2886                 case -NFS4ERR_EXPIRED:
2887                         nfs4_schedule_state_recovery(clp);
2888                         ret = nfs4_wait_clnt_recover(server->client, clp);
2889                         if (ret == 0)
2890                                 exception->retry = 1;
2891                         break;
2892                 case -NFS4ERR_FILE_OPEN:
2893                 case -NFS4ERR_GRACE:
2894                 case -NFS4ERR_DELAY:
2895                         ret = nfs4_delay(server->client, &exception->timeout);
2896                         if (ret != 0)
2897                                 break;
2898                 case -NFS4ERR_OLD_STATEID:
2899                         exception->retry = 1;
2900         }
2901         /* We failed to handle the error */
2902         return nfs4_map_errors(ret);
2903 }
2904
2905 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2906 {
2907         nfs4_verifier sc_verifier;
2908         struct nfs4_setclientid setclientid = {
2909                 .sc_verifier = &sc_verifier,
2910                 .sc_prog = program,
2911         };
2912         struct rpc_message msg = {
2913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2914                 .rpc_argp = &setclientid,
2915                 .rpc_resp = clp,
2916                 .rpc_cred = cred,
2917         };
2918         __be32 *p;
2919         int loop = 0;
2920         int status;
2921
2922         p = (__be32*)sc_verifier.data;
2923         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2924         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2925
2926         for(;;) {
2927                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2928                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2929                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2930                                 cred->cr_ops->cr_name,
2931                                 clp->cl_id_uniquifier);
2932                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2933                                 sizeof(setclientid.sc_netid), "tcp");
2934                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2935                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2936                                 clp->cl_ipaddr, port >> 8, port & 255);
2937
2938                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2939                 if (status != -NFS4ERR_CLID_INUSE)
2940                         break;
2941                 if (signalled())
2942                         break;
2943                 if (loop++ & 1)
2944                         ssleep(clp->cl_lease_time + 1);
2945                 else
2946                         if (++clp->cl_id_uniquifier == 0)
2947                                 break;
2948         }
2949         return status;
2950 }
2951
2952 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2953 {
2954         struct nfs_fsinfo fsinfo;
2955         struct rpc_message msg = {
2956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2957                 .rpc_argp = clp,
2958                 .rpc_resp = &fsinfo,
2959                 .rpc_cred = cred,
2960         };
2961         unsigned long now;
2962         int status;
2963
2964         now = jiffies;
2965         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2966         if (status == 0) {
2967                 spin_lock(&clp->cl_lock);
2968                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2969                 clp->cl_last_renewal = now;
2970                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2971                 spin_unlock(&clp->cl_lock);
2972         }
2973         return status;
2974 }
2975
2976 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2977 {
2978         long timeout;
2979         int err;
2980         do {
2981                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2982                 switch (err) {
2983                         case 0:
2984                                 return err;
2985                         case -NFS4ERR_RESOURCE:
2986                                 /* The IBM lawyers misread another document! */
2987                         case -NFS4ERR_DELAY:
2988                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2989                 }
2990         } while (err == 0);
2991         return err;
2992 }
2993
2994 struct nfs4_delegreturndata {
2995         struct nfs4_delegreturnargs args;
2996         struct nfs4_delegreturnres res;
2997         struct nfs_fh fh;
2998         nfs4_stateid stateid;
2999         struct rpc_cred *cred;
3000         unsigned long timestamp;
3001         struct nfs_fattr fattr;
3002         int rpc_status;
3003 };
3004
3005 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
3006 {
3007         struct nfs4_delegreturndata *data = calldata;
3008         struct rpc_message msg = {
3009                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3010                 .rpc_argp = &data->args,
3011                 .rpc_resp = &data->res,
3012                 .rpc_cred = data->cred,
3013         };
3014         nfs_fattr_init(data->res.fattr);
3015         rpc_call_setup(task, &msg, 0);
3016 }
3017
3018 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3019 {
3020         struct nfs4_delegreturndata *data = calldata;
3021         data->rpc_status = task->tk_status;
3022         if (data->rpc_status == 0)
3023                 renew_lease(data->res.server, data->timestamp);
3024 }
3025
3026 static void nfs4_delegreturn_release(void *calldata)
3027 {
3028         struct nfs4_delegreturndata *data = calldata;
3029
3030         put_rpccred(data->cred);
3031         kfree(calldata);
3032 }
3033
3034 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3035         .rpc_call_prepare = nfs4_delegreturn_prepare,
3036         .rpc_call_done = nfs4_delegreturn_done,
3037         .rpc_release = nfs4_delegreturn_release,
3038 };
3039
3040 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3041 {
3042         struct nfs4_delegreturndata *data;
3043         struct nfs_server *server = NFS_SERVER(inode);
3044         struct rpc_task *task;
3045         int status;
3046
3047         data = kmalloc(sizeof(*data), GFP_KERNEL);
3048         if (data == NULL)
3049                 return -ENOMEM;
3050         data->args.fhandle = &data->fh;
3051         data->args.stateid = &data->stateid;
3052         data->args.bitmask = server->attr_bitmask;
3053         nfs_copy_fh(&data->fh, NFS_FH(inode));
3054         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3055         data->res.fattr = &data->fattr;
3056         data->res.server = server;
3057         data->cred = get_rpccred(cred);
3058         data->timestamp = jiffies;
3059         data->rpc_status = 0;
3060
3061         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3062         if (IS_ERR(task))
3063                 return PTR_ERR(task);
3064         status = nfs4_wait_for_completion_rpc_task(task);
3065         if (status == 0) {
3066                 status = data->rpc_status;
3067                 if (status == 0)
3068                         nfs_post_op_update_inode(inode, &data->fattr);
3069         }
3070         rpc_release_task(task);
3071         return status;
3072 }
3073
3074 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3075 {
3076         struct nfs_server *server = NFS_SERVER(inode);
3077         struct nfs4_exception exception = { };
3078         int err;
3079         do {
3080                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3081                 switch (err) {
3082                         case -NFS4ERR_STALE_STATEID:
3083                         case -NFS4ERR_EXPIRED:
3084                                 nfs4_schedule_state_recovery(server->nfs_client);
3085                         case 0:
3086                                 return 0;
3087                 }
3088                 err = nfs4_handle_exception(server, err, &exception);
3089         } while (exception.retry);
3090         return err;
3091 }
3092
3093 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3094 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3095
3096 /*
3097  * sleep, with exponential backoff, and retry the LOCK operation.
3098  */
3099 static unsigned long
3100 nfs4_set_lock_task_retry(unsigned long timeout)
3101 {
3102         schedule_timeout_interruptible(timeout);
3103         timeout <<= 1;
3104         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3105                 return NFS4_LOCK_MAXTIMEOUT;
3106         return timeout;
3107 }
3108
3109 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3110 {
3111         struct inode *inode = state->inode;
3112         struct nfs_server *server = NFS_SERVER(inode);
3113         struct nfs_client *clp = server->nfs_client;
3114         struct nfs_lockt_args arg = {
3115                 .fh = NFS_FH(inode),
3116                 .fl = request,
3117         };
3118         struct nfs_lockt_res res = {
3119                 .denied = request,
3120         };
3121         struct rpc_message msg = {
3122                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3123                 .rpc_argp       = &arg,
3124                 .rpc_resp       = &res,
3125                 .rpc_cred       = state->owner->so_cred,
3126         };
3127         struct nfs4_lock_state *lsp;
3128         int status;
3129
3130         down_read(&clp->cl_sem);
3131         arg.lock_owner.clientid = clp->cl_clientid;
3132         status = nfs4_set_lock_state(state, request);
3133         if (status != 0)
3134                 goto out;
3135         lsp = request->fl_u.nfs4_fl.owner;
3136         arg.lock_owner.id = lsp->ls_id;
3137         status = rpc_call_sync(server->client, &msg, 0);
3138         switch (status) {
3139                 case 0:
3140                         request->fl_type = F_UNLCK;
3141                         break;
3142                 case -NFS4ERR_DENIED:
3143                         status = 0;
3144         }
3145 out:
3146         up_read(&clp->cl_sem);
3147         return status;
3148 }
3149
3150 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3151 {
3152         struct nfs4_exception exception = { };
3153         int err;
3154
3155         do {
3156                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3157                                 _nfs4_proc_getlk(state, cmd, request),
3158                                 &exception);
3159         } while (exception.retry);
3160         return err;
3161 }
3162
3163 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3164 {
3165         int res = 0;
3166         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3167                 case FL_POSIX:
3168                         res = posix_lock_file_wait(file, fl);
3169                         break;
3170                 case FL_FLOCK:
3171                         res = flock_lock_file_wait(file, fl);
3172                         break;
3173                 default:
3174                         BUG();
3175         }
3176         return res;
3177 }
3178
3179 struct nfs4_unlockdata {
3180         struct nfs_locku_args arg;
3181         struct nfs_locku_res res;
3182         struct nfs4_lock_state *lsp;
3183         struct nfs_open_context *ctx;
3184         struct file_lock fl;
3185         const struct nfs_server *server;
3186         unsigned long timestamp;
3187 };
3188
3189 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3190                 struct nfs_open_context *ctx,
3191                 struct nfs4_lock_state *lsp,
3192                 struct nfs_seqid *seqid)
3193 {
3194         struct nfs4_unlockdata *p;
3195         struct inode *inode = lsp->ls_state->inode;
3196
3197         p = kmalloc(sizeof(*p), GFP_KERNEL);
3198         if (p == NULL)
3199                 return NULL;
3200         p->arg.fh = NFS_FH(inode);
3201         p->arg.fl = &p->fl;
3202         p->arg.seqid = seqid;
3203         p->arg.stateid = &lsp->ls_stateid;
3204         p->lsp = lsp;
3205         atomic_inc(&lsp->ls_count);
3206         /* Ensure we don't close file until we're done freeing locks! */
3207         p->ctx = get_nfs_open_context(ctx);
3208         memcpy(&p->fl, fl, sizeof(p->fl));
3209         p->server = NFS_SERVER(inode);
3210         return p;
3211 }
3212
3213 static void nfs4_locku_release_calldata(void *data)
3214 {
3215         struct nfs4_unlockdata *calldata = data;
3216         nfs_free_seqid(calldata->arg.seqid);
3217         nfs4_put_lock_state(calldata->lsp);
3218         put_nfs_open_context(calldata->ctx);
3219         kfree(calldata);
3220 }
3221
3222 static void nfs4_locku_done(struct rpc_task *task, void *data)
3223 {
3224         struct nfs4_unlockdata *calldata = data;
3225
3226         if (RPC_ASSASSINATED(task))
3227                 return;
3228         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3229         switch (task->tk_status) {
3230                 case 0:
3231                         memcpy(calldata->lsp->ls_stateid.data,
3232                                         calldata->res.stateid.data,
3233                                         sizeof(calldata->lsp->ls_stateid.data));
3234                         renew_lease(calldata->server, calldata->timestamp);
3235                         break;
3236                 case -NFS4ERR_STALE_STATEID:
3237                 case -NFS4ERR_EXPIRED:
3238                         nfs4_schedule_state_recovery(calldata->server->nfs_client);
3239                         break;
3240                 default:
3241                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3242                                 rpc_restart_call(task);
3243                         }
3244         }
3245 }
3246
3247 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3248 {
3249         struct nfs4_unlockdata *calldata = data;
3250         struct rpc_message msg = {
3251                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3252                 .rpc_argp       = &calldata->arg,
3253                 .rpc_resp       = &calldata->res,
3254                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3255         };
3256
3257         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3258                 return;
3259         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3260                 /* Note: exit _without_ running nfs4_locku_done */
3261                 task->tk_action = NULL;
3262                 return;
3263         }
3264         calldata->timestamp = jiffies;
3265         rpc_call_setup(task, &msg, 0);
3266 }
3267
3268 static const struct rpc_call_ops nfs4_locku_ops = {
3269         .rpc_call_prepare = nfs4_locku_prepare,
3270         .rpc_call_done = nfs4_locku_done,
3271         .rpc_release = nfs4_locku_release_calldata,
3272 };
3273
3274 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3275                 struct nfs_open_context *ctx,
3276                 struct nfs4_lock_state *lsp,
3277                 struct nfs_seqid *seqid)
3278 {
3279         struct nfs4_unlockdata *data;
3280
3281         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3282         if (data == NULL) {
3283                 nfs_free_seqid(seqid);
3284                 return ERR_PTR(-ENOMEM);
3285         }
3286
3287         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3288 }
3289
3290 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3291 {
3292         struct nfs_seqid *seqid;
3293         struct nfs4_lock_state *lsp;
3294         struct rpc_task *task;
3295         int status = 0;
3296
3297         status = nfs4_set_lock_state(state, request);
3298         /* Unlock _before_ we do the RPC call */
3299         request->fl_flags |= FL_EXISTS;
3300         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3301                 goto out;
3302         if (status != 0)
3303                 goto out;
3304         /* Is this a delegated lock? */
3305         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3306                 goto out;
3307         lsp = request->fl_u.nfs4_fl.owner;
3308         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3309         status = -ENOMEM;
3310         if (seqid == NULL)
3311                 goto out;
3312         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3313         status = PTR_ERR(task);
3314         if (IS_ERR(task))
3315                 goto out;
3316         status = nfs4_wait_for_completion_rpc_task(task);
3317         rpc_release_task(task);
3318 out:
3319         return status;
3320 }
3321
3322 struct nfs4_lockdata {
3323         struct nfs_lock_args arg;
3324         struct nfs_lock_res res;
3325         struct nfs4_lock_state *lsp;
3326         struct nfs_open_context *ctx;
3327         struct file_lock fl;
3328         unsigned long timestamp;
3329         int rpc_status;
3330         int cancelled;
3331 };
3332
3333 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3334                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3335 {
3336         struct nfs4_lockdata *p;
3337         struct inode *inode = lsp->ls_state->inode;
3338         struct nfs_server *server = NFS_SERVER(inode);
3339
3340         p = kzalloc(sizeof(*p), GFP_KERNEL);
3341         if (p == NULL)
3342                 return NULL;
3343
3344         p->arg.fh = NFS_FH(inode);
3345         p->arg.fl = &p->fl;
3346         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3347         if (p->arg.lock_seqid == NULL)
3348                 goto out_free;
3349         p->arg.lock_stateid = &lsp->ls_stateid;
3350         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3351         p->arg.lock_owner.id = lsp->ls_id;
3352         p->lsp = lsp;
3353         atomic_inc(&lsp->ls_count);
3354         p->ctx = get_nfs_open_context(ctx);
3355         memcpy(&p->fl, fl, sizeof(p->fl));
3356         return p;
3357 out_free:
3358         kfree(p);
3359         return NULL;
3360 }
3361
3362 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3363 {
3364         struct nfs4_lockdata *data = calldata;
3365         struct nfs4_state *state = data->lsp->ls_state;
3366         struct nfs4_state_owner *sp = state->owner;
3367         struct rpc_message msg = {
3368                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3369                 .rpc_argp = &data->arg,
3370                 .rpc_resp = &data->res,
3371                 .rpc_cred = sp->so_cred,
3372         };
3373
3374         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3375                 return;
3376         dprintk("%s: begin!\n", __FUNCTION__);
3377         /* Do we need to do an open_to_lock_owner? */
3378         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3379                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3380                 if (data->arg.open_seqid == NULL) {
3381                         data->rpc_status = -ENOMEM;
3382                         task->tk_action = NULL;
3383                         goto out;
3384                 }
3385                 data->arg.open_stateid = &state->stateid;
3386                 data->arg.new_lock_owner = 1;
3387         }
3388         data->timestamp = jiffies;
3389         rpc_call_setup(task, &msg, 0);
3390 out:
3391         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3392 }
3393
3394 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3395 {
3396         struct nfs4_lockdata *data = calldata;
3397
3398         dprintk("%s: begin!\n", __FUNCTION__);
3399
3400         data->rpc_status = task->tk_status;
3401         if (RPC_ASSASSINATED(task))
3402                 goto out;
3403         if (data->arg.new_lock_owner != 0) {
3404                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3405                 if (data->rpc_status == 0)
3406                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3407                 else
3408                         goto out;
3409         }
3410         if (data->rpc_status == 0) {
3411                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3412                                         sizeof(data->lsp->ls_stateid.data));
3413                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3414                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3415         }
3416         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3417 out:
3418         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3419 }
3420
3421 static void nfs4_lock_release(void *calldata)
3422 {
3423         struct nfs4_lockdata *data = calldata;
3424
3425         dprintk("%s: begin!\n", __FUNCTION__);
3426         if (data->arg.open_seqid != NULL)
3427                 nfs_free_seqid(data->arg.open_seqid);
3428         if (data->cancelled != 0) {
3429                 struct rpc_task *task;
3430                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3431                                 data->arg.lock_seqid);
3432                 if (!IS_ERR(task))
3433                         rpc_release_task(task);
3434                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3435         } else
3436                 nfs_free_seqid(data->arg.lock_seqid);
3437         nfs4_put_lock_state(data->lsp);
3438         put_nfs_open_context(data->ctx);
3439         kfree(data);
3440         dprintk("%s: done!\n", __FUNCTION__);
3441 }
3442
3443 static const struct rpc_call_ops nfs4_lock_ops = {
3444         .rpc_call_prepare = nfs4_lock_prepare,
3445         .rpc_call_done = nfs4_lock_done,
3446         .rpc_release = nfs4_lock_release,
3447 };
3448
3449 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3450 {
3451         struct nfs4_lockdata *data;
3452         struct rpc_task *task;
3453         int ret;
3454
3455         dprintk("%s: begin!\n", __FUNCTION__);
3456         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3457                         fl->fl_u.nfs4_fl.owner);
3458         if (data == NULL)
3459                 return -ENOMEM;
3460         if (IS_SETLKW(cmd))
3461                 data->arg.block = 1;
3462         if (reclaim != 0)
3463                 data->arg.reclaim = 1;
3464         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3465                         &nfs4_lock_ops, data);
3466         if (IS_ERR(task))
3467                 return PTR_ERR(task);
3468         ret = nfs4_wait_for_completion_rpc_task(task);
3469         if (ret == 0) {
3470                 ret = data->rpc_status;
3471                 if (ret == -NFS4ERR_DENIED)
3472                         ret = -EAGAIN;
3473         } else
3474                 data->cancelled = 1;
3475         rpc_release_task(task);
3476         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3477         return ret;
3478 }
3479
3480 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3481 {
3482         struct nfs_server *server = NFS_SERVER(state->inode);
3483         struct nfs4_exception exception = { };
3484         int err;
3485
3486         do {
3487                 /* Cache the lock if possible... */
3488                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3489                         return 0;
3490                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3491                 if (err != -NFS4ERR_DELAY)
3492                         break;
3493                 nfs4_handle_exception(server, err, &exception);
3494         } while (exception.retry);
3495         return err;
3496 }
3497
3498 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3499 {
3500         struct nfs_server *server = NFS_SERVER(state->inode);
3501         struct nfs4_exception exception = { };
3502         int err;
3503
3504         err = nfs4_set_lock_state(state, request);
3505         if (err != 0)
3506                 return err;
3507         do {
3508                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3509                         return 0;
3510                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3511                 if (err != -NFS4ERR_DELAY)
3512                         break;
3513                 nfs4_handle_exception(server, err, &exception);
3514         } while (exception.retry);
3515         return err;
3516 }
3517
3518 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3519 {
3520         struct nfs_client *clp = state->owner->so_client;
3521         unsigned char fl_flags = request->fl_flags;
3522         int status;
3523
3524         /* Is this a delegated open? */
3525         status = nfs4_set_lock_state(state, request);
3526         if (status != 0)
3527                 goto out;
3528         request->fl_flags |= FL_ACCESS;
3529         status = do_vfs_lock(request->fl_file, request);
3530         if (status < 0)
3531                 goto out;
3532         down_read(&clp->cl_sem);
3533         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3534                 struct nfs_inode *nfsi = NFS_I(state->inode);
3535                 /* Yes: cache locks! */
3536                 down_read(&nfsi->rwsem);
3537                 /* ...but avoid races with delegation recall... */
3538                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3539                         request->fl_flags = fl_flags & ~FL_SLEEP;
3540                         status = do_vfs_lock(request->fl_file, request);
3541                         up_read(&nfsi->rwsem);
3542                         goto out_unlock;
3543                 }
3544                 up_read(&nfsi->rwsem);
3545         }
3546         status = _nfs4_do_setlk(state, cmd, request, 0);
3547         if (status != 0)
3548                 goto out_unlock;
3549         /* Note: we always want to sleep here! */
3550         request->fl_flags = fl_flags | FL_SLEEP;
3551         if (do_vfs_lock(request->fl_file, request) < 0)
3552                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3553 out_unlock:
3554         up_read(&clp->cl_sem);
3555 out:
3556         request->fl_flags = fl_flags;
3557         return status;
3558 }
3559
3560 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3561 {
3562         struct nfs4_exception exception = { };
3563         int err;
3564
3565         do {
3566                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3567                                 _nfs4_proc_setlk(state, cmd, request),
3568                                 &exception);
3569         } while (exception.retry);
3570         return err;
3571 }
3572
3573 static int
3574 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3575 {
3576         struct nfs_open_context *ctx;
3577         struct nfs4_state *state;
3578         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3579         int status;
3580
3581         /* verify open state */
3582         ctx = (struct nfs_open_context *)filp->private_data;
3583         state = ctx->state;
3584
3585         if (request->fl_start < 0 || request->fl_end < 0)
3586                 return -EINVAL;
3587
3588         if (IS_GETLK(cmd))
3589                 return nfs4_proc_getlk(state, F_GETLK, request);
3590
3591         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3592                 return -EINVAL;
3593
3594         if (request->fl_type == F_UNLCK)
3595                 return nfs4_proc_unlck(state, cmd, request);
3596
3597         do {
3598                 status = nfs4_proc_setlk(state, cmd, request);
3599                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3600                         break;
3601                 timeout = nfs4_set_lock_task_retry(timeout);
3602                 status = -ERESTARTSYS;
3603                 if (signalled())
3604                         break;
3605         } while(status < 0);
3606         return status;
3607 }
3608
3609 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3610 {
3611         struct nfs_server *server = NFS_SERVER(state->inode);
3612         struct nfs4_exception exception = { };
3613         int err;
3614
3615         err = nfs4_set_lock_state(state, fl);
3616         if (err != 0)
3617                 goto out;
3618         do {
3619                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3620                 if (err != -NFS4ERR_DELAY)
3621                         break;
3622                 err = nfs4_handle_exception(server, err, &exception);
3623         } while (exception.retry);
3624 out:
3625         return err;
3626 }
3627
3628 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3629
3630 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3631                 size_t buflen, int flags)
3632 {
3633         struct inode *inode = dentry->d_inode;
3634
3635         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3636                 return -EOPNOTSUPP;
3637
3638         if (!S_ISREG(inode->i_mode) &&
3639             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3640                 return -EPERM;
3641
3642         return nfs4_proc_set_acl(inode, buf, buflen);
3643 }
3644
3645 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3646  * and that's what we'll do for e.g. user attributes that haven't been set.
3647  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3648  * attributes in kernel-managed attribute namespaces. */
3649 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3650                 size_t buflen)
3651 {
3652         struct inode *inode = dentry->d_inode;
3653
3654         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3655                 return -EOPNOTSUPP;
3656
3657         return nfs4_proc_get_acl(inode, buf, buflen);
3658 }
3659
3660 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3661 {
3662         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3663
3664         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3665                 return 0;
3666         if (buf && buflen < len)
3667                 return -ERANGE;
3668         if (buf)
3669                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3670         return len;
3671 }
3672
3673 int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
3674                 struct nfs4_fs_locations *fs_locations, struct page *page)
3675 {
3676         struct nfs_server *server = NFS_SERVER(dir);
3677         u32 bitmask[2] = {
3678                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3679                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3680         };
3681         struct nfs4_fs_locations_arg args = {
3682                 .dir_fh = NFS_FH(dir),
3683                 .name = &dentry->d_name,
3684                 .page = page,
3685                 .bitmask = bitmask,
3686         };
3687         struct rpc_message msg = {
3688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3689                 .rpc_argp = &args,
3690                 .rpc_resp = fs_locations,
3691         };
3692         int status;
3693
3694         dprintk("%s: start\n", __FUNCTION__);
3695         fs_locations->fattr.valid = 0;
3696         fs_locations->server = server;
3697         fs_locations->nlocations = 0;
3698         status = rpc_call_sync(server->client, &msg, 0);
3699         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3700         return status;
3701 }
3702
3703 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3704         .recover_open   = nfs4_open_reclaim,
3705         .recover_lock   = nfs4_lock_reclaim,
3706 };
3707
3708 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3709         .recover_open   = nfs4_open_expired,
3710         .recover_lock   = nfs4_lock_expired,
3711 };
3712
3713 static struct inode_operations nfs4_file_inode_operations = {
3714         .permission     = nfs_permission,
3715         .getattr        = nfs_getattr,
3716         .setattr        = nfs_setattr,
3717         .getxattr       = nfs4_getxattr,
3718         .setxattr       = nfs4_setxattr,
3719         .listxattr      = nfs4_listxattr,
3720 };
3721
3722 const struct nfs_rpc_ops nfs_v4_clientops = {
3723         .version        = 4,                    /* protocol version */
3724         .dentry_ops     = &nfs4_dentry_operations,
3725         .dir_inode_ops  = &nfs4_dir_inode_operations,
3726         .file_inode_ops = &nfs4_file_inode_operations,
3727         .getroot        = nfs4_proc_get_root,
3728         .getattr        = nfs4_proc_getattr,
3729         .setattr        = nfs4_proc_setattr,
3730         .lookupfh       = nfs4_proc_lookupfh,
3731         .lookup         = nfs4_proc_lookup,
3732         .access         = nfs4_proc_access,
3733         .readlink       = nfs4_proc_readlink,
3734         .read           = nfs4_proc_read,
3735         .write          = nfs4_proc_write,
3736         .commit         = nfs4_proc_commit,
3737         .create         = nfs4_proc_create,
3738         .remove         = nfs4_proc_remove,
3739         .unlink_setup   = nfs4_proc_unlink_setup,
3740         .unlink_done    = nfs4_proc_unlink_done,
3741         .rename         = nfs4_proc_rename,
3742         .link           = nfs4_proc_link,
3743         .symlink        = nfs4_proc_symlink,
3744         .mkdir          = nfs4_proc_mkdir,
3745         .rmdir          = nfs4_proc_remove,
3746         .readdir        = nfs4_proc_readdir,
3747         .mknod          = nfs4_proc_mknod,
3748         .statfs         = nfs4_proc_statfs,
3749         .fsinfo         = nfs4_proc_fsinfo,
3750         .pathconf       = nfs4_proc_pathconf,
3751         .set_capabilities = nfs4_server_capabilities,
3752         .decode_dirent  = nfs4_decode_dirent,
3753         .read_setup     = nfs4_proc_read_setup,
3754         .read_done      = nfs4_read_done,
3755         .write_setup    = nfs4_proc_write_setup,
3756         .write_done     = nfs4_write_done,
3757         .commit_setup   = nfs4_proc_commit_setup,
3758         .commit_done    = nfs4_commit_done,
3759         .file_open      = nfs_open,
3760         .file_release   = nfs_release,
3761         .lock           = nfs4_proc_lock,
3762         .clear_acl_cache = nfs4_zap_acl_attr,
3763 };
3764
3765 /*
3766  * Local variables:
3767  *  c-basic-offset: 8
3768  * End:
3769  */