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
  55 #define NFSDBG_FACILITY         NFSDBG_PROC
  56
  57 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  58 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  59
  60 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid);
  61 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  62 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  63 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  64 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  65 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  66 extern struct rpc_procinfo nfs4_procedures[];
  67
  68 /* Prevent leaks of NFSv4 errors into userland */
  69 int nfs4_map_errors(int err)
  70 {
  71         if (err < -1000) {
  72                 dprintk("%s could not handle NFSv4 error %d\n",
  73                                 __FUNCTION__, -err);
  74                 return -EIO;
  75         }
  76         return err;
  77 }
  78
  79 /*
  80  * This is our standard bitmap for GETATTR requests.
  81  */
  82 const u32 nfs4_fattr_bitmap[2] = {
  83         FATTR4_WORD0_TYPE
  84         | FATTR4_WORD0_CHANGE
  85         | FATTR4_WORD0_SIZE
  86         | FATTR4_WORD0_FSID
  87         | FATTR4_WORD0_FILEID,
  88         FATTR4_WORD1_MODE
  89         | FATTR4_WORD1_NUMLINKS
  90         | FATTR4_WORD1_OWNER
  91         | FATTR4_WORD1_OWNER_GROUP
  92         | FATTR4_WORD1_RAWDEV
  93         | FATTR4_WORD1_SPACE_USED
  94         | FATTR4_WORD1_TIME_ACCESS
  95         | FATTR4_WORD1_TIME_METADATA
  96         | FATTR4_WORD1_TIME_MODIFY
  97 };
  98
  99 const u32 nfs4_statfs_bitmap[2] = {
 100         FATTR4_WORD0_FILES_AVAIL
 101         | FATTR4_WORD0_FILES_FREE
 102         | FATTR4_WORD0_FILES_TOTAL,
 103         FATTR4_WORD1_SPACE_AVAIL
 104         | FATTR4_WORD1_SPACE_FREE
 105         | FATTR4_WORD1_SPACE_TOTAL
 106 };
 107
 108 const u32 nfs4_pathconf_bitmap[2] = {
 109         FATTR4_WORD0_MAXLINK
 110         | FATTR4_WORD0_MAXNAME,
 111         0
 112 };
 113
 114 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 115                         | FATTR4_WORD0_MAXREAD
 116                         | FATTR4_WORD0_MAXWRITE
 117                         | FATTR4_WORD0_LEASE_TIME,
 118                         0
 119 };
 120
 121 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 122                 struct nfs4_readdir_arg *readdir)
 123 {
 124         u32 *start, *p;
 125
 126         BUG_ON(readdir->count < 80);
 127         if (cookie > 2) {
 128                 readdir->cookie = cookie;
 129                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 130                 return;
 131         }
 132
 133         readdir->cookie = 0;
 134         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 135         if (cookie == 2)
 136                 return;
 137
 138         /*
 139          * NFSv4 servers do not return entries for '.' and '..'
 140          * Therefore, we fake these entries here.  We let '.'
 141          * have cookie 0 and '..' have cookie 1.  Note that
 142          * when talking to the server, we always send cookie 0
 143          * instead of 1 or 2.
 144          */
 145         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 146
 147         if (cookie == 0) {
 148                 *p++ = xdr_one;                                  /* next */
 149                 *p++ = xdr_zero;                   /* cookie, first word */
 150                 *p++ = xdr_one;                   /* cookie, second word */
 151                 *p++ = xdr_one;                             /* entry len */
 152                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 153                 p++;
 154                 *p++ = xdr_one;                         /* bitmap length */
 155                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 156                 *p++ = htonl(8);              /* attribute buffer length */
 157                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 158         }
 159
 160         *p++ = xdr_one;                                  /* next */
 161         *p++ = xdr_zero;                   /* cookie, first word */
 162         *p++ = xdr_two;                   /* cookie, second word */
 163         *p++ = xdr_two;                             /* entry len */
 164         memcpy(p, "..\0\0", 4);                         /* entry */
 165         p++;
 166         *p++ = xdr_one;                         /* bitmap length */
 167         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 168         *p++ = htonl(8);              /* attribute buffer length */
 169         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 170
 171         readdir->pgbase = (char *)p - (char *)start;
 172         readdir->count -= readdir->pgbase;
 173         kunmap_atomic(start, KM_USER0);
 174 }
 175
 176 static void
 177 renew_lease(struct nfs_server *server, unsigned long timestamp)
 178 {
 179         struct nfs4_client *clp = server->nfs4_state;
 180         spin_lock(&clp->cl_lock);
 181         if (time_before(clp->cl_last_renewal,timestamp))
 182                 clp->cl_last_renewal = timestamp;
 183         spin_unlock(&clp->cl_lock);
 184 }
 185
 186 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 187 {
 188         struct nfs_inode *nfsi = NFS_I(inode);
 189
 190         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 191                 nfsi->change_attr = cinfo->after;
 192 }
 193
 194 /* Helper for asynchronous RPC calls */
 195 static int nfs4_call_async(struct rpc_clnt *clnt, rpc_action tk_begin,
 196                 rpc_action tk_exit, void *calldata)
 197 {
 198         struct rpc_task *task;
 199
 200         if (!(task = rpc_new_task(clnt, tk_exit, RPC_TASK_ASYNC)))
 201                 return -ENOMEM;
 202
 203         task->tk_calldata = calldata;
 204         task->tk_action = tk_begin;
 205         rpc_execute(task);
 206         return 0;
 207 }
 208
 209 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 210 {
 211         struct inode *inode = state->inode;
 212
 213         open_flags &= (FMODE_READ|FMODE_WRITE);
 214         /* Protect against nfs4_find_state() */
 215         spin_lock(&inode->i_lock);
 216         state->state |= open_flags;
 217         /* NB! List reordering - see the reclaim code for why.  */
 218         if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++)
 219                 list_move(&state->open_states, &state->owner->so_states);
 220         if (open_flags & FMODE_READ)
 221                 state->nreaders++;
 222         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 223         spin_unlock(&inode->i_lock);
 224 }
 225
 226 /*
 227  * OPEN_RECLAIM:
 228  *      reclaim state on the server after a reboot.
 229  */
 230 static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 231 {
 232         struct inode *inode = state->inode;
 233         struct nfs_server *server = NFS_SERVER(inode);
 234         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 235         struct nfs_openargs o_arg = {
 236                 .fh = NFS_FH(inode),
 237                 .id = sp->so_id,
 238                 .open_flags = state->state,
 239                 .clientid = server->nfs4_state->cl_clientid,
 240                 .claim = NFS4_OPEN_CLAIM_PREVIOUS,
 241                 .bitmask = server->attr_bitmask,
 242         };
 243         struct nfs_openres o_res = {
 244                 .server = server,       /* Grrr */
 245         };
 246         struct rpc_message msg = {
 247                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 248                 .rpc_argp       = &o_arg,
 249                 .rpc_resp       = &o_res,
 250                 .rpc_cred       = sp->so_cred,
 251         };
 252         int status;
 253
 254         if (delegation != NULL) {
 255                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 256                         memcpy(&state->stateid, &delegation->stateid,
 257                                         sizeof(state->stateid));
 258                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 259                         return 0;
 260                 }
 261                 o_arg.u.delegation_type = delegation->type;
 262         }
 263         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 264         if (o_arg.seqid == NULL)
 265                 return -ENOMEM;
 266         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 267         /* Confirm the sequence as being established */
 268         nfs_confirm_seqid(&sp->so_seqid, status);
 269         nfs_increment_open_seqid(status, o_arg.seqid);
 270         if (status == 0) {
 271                 memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 272                 if (o_res.delegation_type != 0) {
 273                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 274                         /* Did the server issue an immediate delegation recall? */
 275                         if (o_res.do_recall)
 276                                 nfs_async_inode_return_delegation(inode, &o_res.stateid);
 277                 }
 278         }
 279         nfs_free_seqid(o_arg.seqid);
 280         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 281         /* Ensure we update the inode attributes */
 282         NFS_CACHEINV(inode);
 283         return status;
 284 }
 285
 286 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 287 {
 288         struct nfs_server *server = NFS_SERVER(state->inode);
 289         struct nfs4_exception exception = { };
 290         int err;
 291         do {
 292                 err = _nfs4_open_reclaim(sp, state);
 293                 if (err != -NFS4ERR_DELAY)
 294                         break;
 295                 nfs4_handle_exception(server, err, &exception);
 296         } while (exception.retry);
 297         return err;
 298 }
 299
 300 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 301 {
 302         struct nfs4_state_owner  *sp  = state->owner;
 303         struct inode *inode = dentry->d_inode;
 304         struct nfs_server *server = NFS_SERVER(inode);
 305         struct dentry *parent = dget_parent(dentry);
 306         struct nfs_openargs arg = {
 307                 .fh = NFS_FH(parent->d_inode),
 308                 .clientid = server->nfs4_state->cl_clientid,
 309                 .name = &dentry->d_name,
 310                 .id = sp->so_id,
 311                 .server = server,
 312                 .bitmask = server->attr_bitmask,
 313                 .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR,
 314         };
 315         struct nfs_openres res = {
 316                 .server = server,
 317         };
 318         struct  rpc_message msg = {
 319                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR],
 320                 .rpc_argp       = &arg,
 321                 .rpc_resp       = &res,
 322                 .rpc_cred       = sp->so_cred,
 323         };
 324         int status = 0;
 325
 326         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 327                 goto out;
 328         if (state->state == 0)
 329                 goto out;
 330         arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 331         status = -ENOMEM;
 332         if (arg.seqid == NULL)
 333                 goto out;
 334         arg.open_flags = state->state;
 335         memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data));
 336         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 337         nfs_increment_open_seqid(status, arg.seqid);
 338         if (status != 0)
 339                 goto out_free;
 340         if(res.rflags & NFS4_OPEN_RESULT_CONFIRM) {
 341                 status = _nfs4_proc_open_confirm(server->client, NFS_FH(inode),
 342                                 sp, &res.stateid, arg.seqid);
 343                 if (status != 0)
 344                         goto out_free;
 345         }
 346         nfs_confirm_seqid(&sp->so_seqid, 0);
 347         if (status >= 0) {
 348                 memcpy(state->stateid.data, res.stateid.data,
 349                                 sizeof(state->stateid.data));
 350                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
 351         }
 352 out_free:
 353         nfs_free_seqid(arg.seqid);
 354 out:
 355         dput(parent);
 356         return status;
 357 }
 358
 359 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 360 {
 361         struct nfs4_exception exception = { };
 362         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 363         int err;
 364         do {
 365                 err = _nfs4_open_delegation_recall(dentry, state);
 366                 switch (err) {
 367                         case 0:
 368                                 return err;
 369                         case -NFS4ERR_STALE_CLIENTID:
 370                         case -NFS4ERR_STALE_STATEID:
 371                         case -NFS4ERR_EXPIRED:
 372                                 /* Don't recall a delegation if it was lost */
 373                                 nfs4_schedule_state_recovery(server->nfs4_state);
 374                                 return err;
 375                 }
 376                 err = nfs4_handle_exception(server, err, &exception);
 377         } while (exception.retry);
 378         return err;
 379 }
 380
 381 static int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid, struct nfs_seqid *seqid)
 382 {
 383         struct nfs_open_confirmargs arg = {
 384                 .fh             = fh,
 385                 .seqid          = seqid,
 386                 .stateid        = *stateid,
 387         };
 388         struct nfs_open_confirmres res;
 389         struct  rpc_message msg = {
 390                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 391                 .rpc_argp       = &arg,
 392                 .rpc_resp       = &res,
 393                 .rpc_cred       = sp->so_cred,
 394         };
 395         int status;
 396
 397         status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR);
 398         /* Confirm the sequence as being established */
 399         nfs_confirm_seqid(&sp->so_seqid, status);
 400         nfs_increment_open_seqid(status, seqid);
 401         if (status >= 0)
 402                 memcpy(stateid, &res.stateid, sizeof(*stateid));
 403         return status;
 404 }
 405
 406 static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner  *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res)
 407 {
 408         struct nfs_server *server = NFS_SERVER(dir);
 409         struct rpc_message msg = {
 410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 411                 .rpc_argp = o_arg,
 412                 .rpc_resp = o_res,
 413                 .rpc_cred = sp->so_cred,
 414         };
 415         int status;
 416
 417         /* Update sequence id. The caller must serialize! */
 418         o_arg->id = sp->so_id;
 419         o_arg->clientid = sp->so_client->cl_clientid;
 420
 421         status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
 422         if (status == 0) {
 423                 /* OPEN on anything except a regular file is disallowed in NFSv4 */
 424                 switch (o_res->f_attr->mode & S_IFMT) {
 425                         case S_IFREG:
 426                                 break;
 427                         case S_IFLNK:
 428                                 status = -ELOOP;
 429                                 break;
 430                         case S_IFDIR:
 431                                 status = -EISDIR;
 432                                 break;
 433                         default:
 434                                 status = -ENOTDIR;
 435                 }
 436         }
 437
 438         nfs_increment_open_seqid(status, o_arg->seqid);
 439         if (status != 0)
 440                 goto out;
 441         update_changeattr(dir, &o_res->cinfo);
 442         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 443                 status = _nfs4_proc_open_confirm(server->client, &o_res->fh,
 444                                 sp, &o_res->stateid, o_arg->seqid);
 445                 if (status != 0)
 446                         goto out;
 447         }
 448         nfs_confirm_seqid(&sp->so_seqid, 0);
 449         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 450                 status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 451 out:
 452         return status;
 453 }
 454
 455 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 456 {
 457         struct nfs_access_entry cache;
 458         int mask = 0;
 459         int status;
 460
 461         if (openflags & FMODE_READ)
 462                 mask |= MAY_READ;
 463         if (openflags & FMODE_WRITE)
 464                 mask |= MAY_WRITE;
 465         status = nfs_access_get_cached(inode, cred, &cache);
 466         if (status == 0)
 467                 goto out;
 468
 469         /* Be clever: ask server to check for all possible rights */
 470         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 471         cache.cred = cred;
 472         cache.jiffies = jiffies;
 473         status = _nfs4_proc_access(inode, &cache);
 474         if (status != 0)
 475                 return status;
 476         nfs_access_add_cache(inode, &cache);
 477 out:
 478         if ((cache.mask & mask) == mask)
 479                 return 0;
 480         return -EACCES;
 481 }
 482
 483 /*
 484  * OPEN_EXPIRED:
 485  *      reclaim state on the server after a network partition.
 486  *      Assumes caller holds the appropriate lock
 487  */
 488 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 489 {
 490         struct dentry *parent = dget_parent(dentry);
 491         struct inode *dir = parent->d_inode;
 492         struct inode *inode = state->inode;
 493         struct nfs_server *server = NFS_SERVER(dir);
 494         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 495         struct nfs_fattr        f_attr = {
 496                 .valid = 0,
 497         };
 498         struct nfs_openargs o_arg = {
 499                 .fh = NFS_FH(dir),
 500                 .open_flags = state->state,
 501                 .name = &dentry->d_name,
 502                 .bitmask = server->attr_bitmask,
 503                 .claim = NFS4_OPEN_CLAIM_NULL,
 504         };
 505         struct nfs_openres o_res = {
 506                 .f_attr = &f_attr,
 507                 .server = server,
 508         };
 509         int status = 0;
 510
 511         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 512                 status = _nfs4_do_access(inode, sp->so_cred, state->state);
 513                 if (status < 0)
 514                         goto out;
 515                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 516                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 517                 goto out;
 518         }
 519         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 520         status = -ENOMEM;
 521         if (o_arg.seqid == NULL)
 522                 goto out;
 523         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 524         if (status != 0)
 525                 goto out_nodeleg;
 526         /* Check if files differ */
 527         if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT))
 528                 goto out_stale;
 529         /* Has the file handle changed? */
 530         if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) {
 531                 /* Verify if the change attributes are the same */
 532                 if (f_attr.change_attr != NFS_I(inode)->change_attr)
 533                         goto out_stale;
 534                 if (nfs_size_to_loff_t(f_attr.size) != inode->i_size)
 535                         goto out_stale;
 536                 /* Lets just pretend that this is the same file */
 537                 nfs_copy_fh(NFS_FH(inode), &o_res.fh);
 538                 NFS_I(inode)->fileid = f_attr.fileid;
 539         }
 540         memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid));
 541         if (o_res.delegation_type != 0) {
 542                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM))
 543                         nfs_inode_set_delegation(inode, sp->so_cred, &o_res);
 544                 else
 545                         nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res);
 546         }
 547 out_nodeleg:
 548         nfs_free_seqid(o_arg.seqid);
 549         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 550 out:
 551         dput(parent);
 552         return status;
 553 out_stale:
 554         status = -ESTALE;
 555         /* Invalidate the state owner so we don't ever use it again */
 556         nfs4_drop_state_owner(sp);
 557         d_drop(dentry);
 558         /* Should we be trying to close that stateid? */
 559         goto out_nodeleg;
 560 }
 561
 562 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 563 {
 564         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 565         struct nfs4_exception exception = { };
 566         int err;
 567
 568         do {
 569                 err = _nfs4_open_expired(sp, state, dentry);
 570                 if (err == -NFS4ERR_DELAY)
 571                         nfs4_handle_exception(server, err, &exception);
 572         } while (exception.retry);
 573         return err;
 574 }
 575
 576 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 577 {
 578         struct nfs_inode *nfsi = NFS_I(state->inode);
 579         struct nfs_open_context *ctx;
 580         int status;
 581
 582         spin_lock(&state->inode->i_lock);
 583         list_for_each_entry(ctx, &nfsi->open_files, list) {
 584                 if (ctx->state != state)
 585                         continue;
 586                 get_nfs_open_context(ctx);
 587                 spin_unlock(&state->inode->i_lock);
 588                 status = nfs4_do_open_expired(sp, state, ctx->dentry);
 589                 put_nfs_open_context(ctx);
 590                 return status;
 591         }
 592         spin_unlock(&state->inode->i_lock);
 593         return -ENOENT;
 594 }
 595
 596 /*
 597  * Returns an nfs4_state + an extra reference to the inode
 598  */
 599 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 600 {
 601         struct nfs_delegation *delegation;
 602         struct nfs_server *server = NFS_SERVER(inode);
 603         struct nfs4_client *clp = server->nfs4_state;
 604         struct nfs_inode *nfsi = NFS_I(inode);
 605         struct nfs4_state_owner *sp = NULL;
 606         struct nfs4_state *state = NULL;
 607         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 608         int err;
 609
 610         /* Protect against reboot recovery - NOTE ORDER! */
 611         down_read(&clp->cl_sem);
 612         /* Protect against delegation recall */
 613         down_read(&nfsi->rwsem);
 614         delegation = NFS_I(inode)->delegation;
 615         err = -ENOENT;
 616         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 617                 goto out_err;
 618         err = -ENOMEM;
 619         if (!(sp = nfs4_get_state_owner(server, cred))) {
 620                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 621                 goto out_err;
 622         }
 623         state = nfs4_get_open_state(inode, sp);
 624         if (state == NULL)
 625                 goto out_err;
 626
 627         err = -ENOENT;
 628         if ((state->state & open_flags) == open_flags) {
 629                 spin_lock(&inode->i_lock);
 630                 if (open_flags & FMODE_READ)
 631                         state->nreaders++;
 632                 if (open_flags & FMODE_WRITE)
 633                         state->nwriters++;
 634                 spin_unlock(&inode->i_lock);
 635                 goto out_ok;
 636         } else if (state->state != 0)
 637                 goto out_err;
 638
 639         lock_kernel();
 640         err = _nfs4_do_access(inode, cred, open_flags);
 641         unlock_kernel();
 642         if (err != 0)
 643                 goto out_err;
 644         set_bit(NFS_DELEGATED_STATE, &state->flags);
 645         update_open_stateid(state, &delegation->stateid, open_flags);
 646 out_ok:
 647         nfs4_put_state_owner(sp);
 648         up_read(&nfsi->rwsem);
 649         up_read(&clp->cl_sem);
 650         igrab(inode);
 651         *res = state;
 652         return 0;
 653 out_err:
 654         if (sp != NULL) {
 655                 if (state != NULL)
 656                         nfs4_put_open_state(state);
 657                 nfs4_put_state_owner(sp);
 658         }
 659         up_read(&nfsi->rwsem);
 660         up_read(&clp->cl_sem);
 661         return err;
 662 }
 663
 664 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 665 {
 666         struct nfs4_exception exception = { };
 667         struct nfs4_state *res;
 668         int err;
 669
 670         do {
 671                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 672                 if (err == 0)
 673                         break;
 674                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 675                                         err, &exception));
 676         } while (exception.retry);
 677         return res;
 678 }
 679
 680 /*
 681  * Returns an nfs4_state + an referenced inode
 682  */
 683 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 684 {
 685         struct nfs4_state_owner  *sp;
 686         struct nfs4_state     *state = NULL;
 687         struct nfs_server       *server = NFS_SERVER(dir);
 688         struct nfs4_client *clp = server->nfs4_state;
 689         struct inode *inode = NULL;
 690         int                     status;
 691         struct nfs_fattr        f_attr = {
 692                 .valid          = 0,
 693         };
 694         struct nfs_openargs o_arg = {
 695                 .fh             = NFS_FH(dir),
 696                 .open_flags     = flags,
 697                 .name           = &dentry->d_name,
 698                 .server         = server,
 699                 .bitmask = server->attr_bitmask,
 700                 .claim = NFS4_OPEN_CLAIM_NULL,
 701         };
 702         struct nfs_openres o_res = {
 703                 .f_attr         = &f_attr,
 704                 .server         = server,
 705         };
 706
 707         /* Protect against reboot recovery conflicts */
 708         down_read(&clp->cl_sem);
 709         status = -ENOMEM;
 710         if (!(sp = nfs4_get_state_owner(server, cred))) {
 711                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 712                 goto out_err;
 713         }
 714         if (flags & O_EXCL) {
 715                 u32 *p = (u32 *) o_arg.u.verifier.data;
 716                 p[0] = jiffies;
 717                 p[1] = current->pid;
 718         } else
 719                 o_arg.u.attrs = sattr;
 720         /* Serialization for the sequence id */
 721
 722         o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 723         if (o_arg.seqid == NULL)
 724                 return -ENOMEM;
 725         status = _nfs4_proc_open(dir, sp, &o_arg, &o_res);
 726         if (status != 0)
 727                 goto out_err;
 728
 729         status = -ENOMEM;
 730         inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr);
 731         if (!inode)
 732                 goto out_err;
 733         state = nfs4_get_open_state(inode, sp);
 734         if (!state)
 735                 goto out_err;
 736         update_open_stateid(state, &o_res.stateid, flags);
 737         if (o_res.delegation_type != 0)
 738                 nfs_inode_set_delegation(inode, cred, &o_res);
 739         nfs_free_seqid(o_arg.seqid);
 740         nfs4_put_state_owner(sp);
 741         up_read(&clp->cl_sem);
 742         *res = state;
 743         return 0;
 744 out_err:
 745         if (sp != NULL) {
 746                 if (state != NULL)
 747                         nfs4_put_open_state(state);
 748                 nfs_free_seqid(o_arg.seqid);
 749                 nfs4_put_state_owner(sp);
 750         }
 751         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 752         up_read(&clp->cl_sem);
 753         if (inode != NULL)
 754                 iput(inode);
 755         *res = NULL;
 756         return status;
 757 }
 758
 759
 760 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 761 {
 762         struct nfs4_exception exception = { };
 763         struct nfs4_state *res;
 764         int status;
 765
 766         do {
 767                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 768                 if (status == 0)
 769                         break;
 770                 /* NOTE: BAD_SEQID means the server and client disagree about the
 771                  * book-keeping w.r.t. state-changing operations
 772                  * (OPEN/CLOSE/LOCK/LOCKU...)
 773                  * It is actually a sign of a bug on the client or on the server.
 774                  *
 775                  * If we receive a BAD_SEQID error in the particular case of
 776                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 777                  * have unhashed the old state_owner for us, and that we can
 778                  * therefore safely retry using a new one. We should still warn
 779                  * the user though...
 780                  */
 781                 if (status == -NFS4ERR_BAD_SEQID) {
 782                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 783                         exception.retry = 1;
 784                         continue;
 785                 }
 786                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 787                                         status, &exception));
 788         } while (exception.retry);
 789         return res;
 790 }
 791
 792 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 793                 struct nfs_fh *fhandle, struct iattr *sattr,
 794                 struct nfs4_state *state)
 795 {
 796         struct nfs_setattrargs  arg = {
 797                 .fh             = fhandle,
 798                 .iap            = sattr,
 799                 .server         = server,
 800                 .bitmask = server->attr_bitmask,
 801         };
 802         struct nfs_setattrres  res = {
 803                 .fattr          = fattr,
 804                 .server         = server,
 805         };
 806         struct rpc_message msg = {
 807                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
 808                 .rpc_argp       = &arg,
 809                 .rpc_resp       = &res,
 810         };
 811         int status;
 812
 813         fattr->valid = 0;
 814
 815         if (state != NULL) {
 816                 msg.rpc_cred = state->owner->so_cred;
 817                 nfs4_copy_stateid(&arg.stateid, state, current->files);
 818         } else
 819                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
 820
 821         status = rpc_call_sync(server->client, &msg, 0);
 822         return status;
 823 }
 824
 825 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 826                 struct nfs_fh *fhandle, struct iattr *sattr,
 827                 struct nfs4_state *state)
 828 {
 829         struct nfs4_exception exception = { };
 830         int err;
 831         do {
 832                 err = nfs4_handle_exception(server,
 833                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
 834                                         state),
 835                                 &exception);
 836         } while (exception.retry);
 837         return err;
 838 }
 839
 840 struct nfs4_closedata {
 841         struct inode *inode;
 842         struct nfs4_state *state;
 843         struct nfs_closeargs arg;
 844         struct nfs_closeres res;
 845 };
 846
 847 static void nfs4_free_closedata(struct nfs4_closedata *calldata)
 848 {
 849         struct nfs4_state *state = calldata->state;
 850         struct nfs4_state_owner *sp = state->owner;
 851
 852         nfs4_put_open_state(calldata->state);
 853         nfs_free_seqid(calldata->arg.seqid);
 854         nfs4_put_state_owner(sp);
 855         kfree(calldata);
 856 }
 857
 858 static void nfs4_close_done(struct rpc_task *task)
 859 {
 860         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 861         struct nfs4_state *state = calldata->state;
 862         struct nfs_server *server = NFS_SERVER(calldata->inode);
 863
 864         /* hmm. we are done with the inode, and in the process of freeing
 865          * the state_owner. we keep this around to process errors
 866          */
 867         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
 868         switch (task->tk_status) {
 869                 case 0:
 870                         memcpy(&state->stateid, &calldata->res.stateid,
 871                                         sizeof(state->stateid));
 872                         break;
 873                 case -NFS4ERR_STALE_STATEID:
 874                 case -NFS4ERR_EXPIRED:
 875                         state->state = calldata->arg.open_flags;
 876                         nfs4_schedule_state_recovery(server->nfs4_state);
 877                         break;
 878                 default:
 879                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
 880                                 rpc_restart_call(task);
 881                                 return;
 882                         }
 883         }
 884         state->state = calldata->arg.open_flags;
 885         nfs4_free_closedata(calldata);
 886 }
 887
 888 static void nfs4_close_begin(struct rpc_task *task)
 889 {
 890         struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata;
 891         struct nfs4_state *state = calldata->state;
 892         struct rpc_message msg = {
 893                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
 894                 .rpc_argp = &calldata->arg,
 895                 .rpc_resp = &calldata->res,
 896                 .rpc_cred = state->owner->so_cred,
 897         };
 898         int mode = 0;
 899         int status;
 900
 901         status = nfs_wait_on_sequence(calldata->arg.seqid, task);
 902         if (status != 0)
 903                 return;
 904         /* Don't reorder reads */
 905         smp_rmb();
 906         /* Recalculate the new open mode in case someone reopened the file
 907          * while we were waiting in line to be scheduled.
 908          */
 909         if (state->nreaders != 0)
 910                 mode |= FMODE_READ;
 911         if (state->nwriters != 0)
 912                 mode |= FMODE_WRITE;
 913         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
 914                 state->state = mode;
 915         if (mode == state->state) {
 916                 nfs4_free_closedata(calldata);
 917                 task->tk_exit = NULL;
 918                 rpc_exit(task, 0);
 919                 return;
 920         }
 921         if (mode != 0)
 922                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
 923         calldata->arg.open_flags = mode;
 924         rpc_call_setup(task, &msg, 0);
 925 }
 926
 927 /*
 928  * It is possible for data to be read/written from a mem-mapped file
 929  * after the sys_close call (which hits the vfs layer as a flush).
 930  * This means that we can't safely call nfsv4 close on a file until
 931  * the inode is cleared. This in turn means that we are not good
 932  * NFSv4 citizens - we do not indicate to the server to update the file's
 933  * share state even when we are done with one of the three share
 934  * stateid's in the inode.
 935  *
 936  * NOTE: Caller must be holding the sp->so_owner semaphore!
 937  */
 938 int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode)
 939 {
 940         struct nfs4_closedata *calldata;
 941         int status = -ENOMEM;
 942
 943         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
 944         if (calldata == NULL)
 945                 goto out;
 946         calldata->inode = inode;
 947         calldata->state = state;
 948         calldata->arg.fh = NFS_FH(inode);
 949         calldata->arg.stateid = &state->stateid;
 950         /* Serialization for the sequence id */
 951         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
 952         if (calldata->arg.seqid == NULL)
 953                 goto out_free_calldata;
 954
 955         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_close_begin,
 956                         nfs4_close_done, calldata);
 957         if (status == 0)
 958                 goto out;
 959
 960         nfs_free_seqid(calldata->arg.seqid);
 961 out_free_calldata:
 962         kfree(calldata);
 963 out:
 964         return status;
 965 }
 966
 967 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
 968 {
 969         struct file *filp;
 970
 971         filp = lookup_instantiate_filp(nd, dentry, NULL);
 972         if (!IS_ERR(filp)) {
 973                 struct nfs_open_context *ctx;
 974                 ctx = (struct nfs_open_context *)filp->private_data;
 975                 ctx->state = state;
 976         } else
 977                 nfs4_close_state(state, nd->intent.open.flags);
 978 }
 979
 980 struct dentry *
 981 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 982 {
 983         struct iattr attr;
 984         struct rpc_cred *cred;
 985         struct nfs4_state *state;
 986         struct dentry *res;
 987
 988         if (nd->flags & LOOKUP_CREATE) {
 989                 attr.ia_mode = nd->intent.open.create_mode;
 990                 attr.ia_valid = ATTR_MODE;
 991                 if (!IS_POSIXACL(dir))
 992                         attr.ia_mode &= ~current->fs->umask;
 993         } else {
 994                 attr.ia_valid = 0;
 995                 BUG_ON(nd->intent.open.flags & O_CREAT);
 996         }
 997
 998         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
 999         if (IS_ERR(cred))
1000                 return (struct dentry *)cred;
1001         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1002         put_rpccred(cred);
1003         if (IS_ERR(state)) {
1004                 if (PTR_ERR(state) == -ENOENT)
1005                         d_add(dentry, NULL);
1006                 return (struct dentry *)state;
1007         }
1008         res = d_add_unique(dentry, state->inode);
1009         if (res != NULL)
1010                 dentry = res;
1011         nfs4_intent_set_file(nd, dentry, state);
1012         return res;
1013 }
1014
1015 int
1016 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1017 {
1018         struct rpc_cred *cred;
1019         struct nfs4_state *state;
1020         struct inode *inode;
1021
1022         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1023         if (IS_ERR(cred))
1024                 return PTR_ERR(cred);
1025         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1026         if (IS_ERR(state))
1027                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1028         put_rpccred(cred);
1029         if (IS_ERR(state)) {
1030                 switch (PTR_ERR(state)) {
1031                         case -EPERM:
1032                         case -EACCES:
1033                         case -EDQUOT:
1034                         case -ENOSPC:
1035                         case -EROFS:
1036                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1037                                 return 1;
1038                         case -ENOENT:
1039                                 if (dentry->d_inode == NULL)
1040                                         return 1;
1041                 }
1042                 goto out_drop;
1043         }
1044         inode = state->inode;
1045         iput(inode);
1046         if (inode == dentry->d_inode) {
1047                 nfs4_intent_set_file(nd, dentry, state);
1048                 return 1;
1049         }
1050         nfs4_close_state(state, openflags);
1051 out_drop:
1052         d_drop(dentry);
1053         return 0;
1054 }
1055
1056
1057 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1058 {
1059         struct nfs4_server_caps_res res = {};
1060         struct rpc_message msg = {
1061                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1062                 .rpc_argp = fhandle,
1063                 .rpc_resp = &res,
1064         };
1065         int status;
1066
1067         status = rpc_call_sync(server->client, &msg, 0);
1068         if (status == 0) {
1069                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1070                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1071                         server->caps |= NFS_CAP_ACLS;
1072                 if (res.has_links != 0)
1073                         server->caps |= NFS_CAP_HARDLINKS;
1074                 if (res.has_symlinks != 0)
1075                         server->caps |= NFS_CAP_SYMLINKS;
1076                 server->acl_bitmask = res.acl_bitmask;
1077         }
1078         return status;
1079 }
1080
1081 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1082 {
1083         struct nfs4_exception exception = { };
1084         int err;
1085         do {
1086                 err = nfs4_handle_exception(server,
1087                                 _nfs4_server_capabilities(server, fhandle),
1088                                 &exception);
1089         } while (exception.retry);
1090         return err;
1091 }
1092
1093 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1094                 struct nfs_fsinfo *info)
1095 {
1096         struct nfs_fattr *      fattr = info->fattr;
1097         struct nfs4_lookup_root_arg args = {
1098                 .bitmask = nfs4_fattr_bitmap,
1099         };
1100         struct nfs4_lookup_res res = {
1101                 .server = server,
1102                 .fattr = fattr,
1103                 .fh = fhandle,
1104         };
1105         struct rpc_message msg = {
1106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1107                 .rpc_argp = &args,
1108                 .rpc_resp = &res,
1109         };
1110         fattr->valid = 0;
1111         return rpc_call_sync(server->client, &msg, 0);
1112 }
1113
1114 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1115                 struct nfs_fsinfo *info)
1116 {
1117         struct nfs4_exception exception = { };
1118         int err;
1119         do {
1120                 err = nfs4_handle_exception(server,
1121                                 _nfs4_lookup_root(server, fhandle, info),
1122                                 &exception);
1123         } while (exception.retry);
1124         return err;
1125 }
1126
1127 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1128                 struct nfs_fsinfo *info)
1129 {
1130         struct nfs_fattr *      fattr = info->fattr;
1131         unsigned char *         p;
1132         struct qstr             q;
1133         struct nfs4_lookup_arg args = {
1134                 .dir_fh = fhandle,
1135                 .name = &q,
1136                 .bitmask = nfs4_fattr_bitmap,
1137         };
1138         struct nfs4_lookup_res res = {
1139                 .server = server,
1140                 .fattr = fattr,
1141                 .fh = fhandle,
1142         };
1143         struct rpc_message msg = {
1144                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1145                 .rpc_argp = &args,
1146                 .rpc_resp = &res,
1147         };
1148         int status;
1149
1150         /*
1151          * Now we do a separate LOOKUP for each component of the mount path.
1152          * The LOOKUPs are done separately so that we can conveniently
1153          * catch an ERR_WRONGSEC if it occurs along the way...
1154          */
1155         status = nfs4_lookup_root(server, fhandle, info);
1156         if (status)
1157                 goto out;
1158
1159         p = server->mnt_path;
1160         for (;;) {
1161                 struct nfs4_exception exception = { };
1162
1163                 while (*p == '/')
1164                         p++;
1165                 if (!*p)
1166                         break;
1167                 q.name = p;
1168                 while (*p && (*p != '/'))
1169                         p++;
1170                 q.len = p - q.name;
1171
1172                 do {
1173                         fattr->valid = 0;
1174                         status = nfs4_handle_exception(server,
1175                                         rpc_call_sync(server->client, &msg, 0),
1176                                         &exception);
1177                 } while (exception.retry);
1178                 if (status == 0)
1179                         continue;
1180                 if (status == -ENOENT) {
1181                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1182                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1183                 }
1184                 break;
1185         }
1186         if (status == 0)
1187                 status = nfs4_server_capabilities(server, fhandle);
1188         if (status == 0)
1189                 status = nfs4_do_fsinfo(server, fhandle, info);
1190 out:
1191         return status;
1192 }
1193
1194 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1195 {
1196         struct nfs4_getattr_arg args = {
1197                 .fh = fhandle,
1198                 .bitmask = server->attr_bitmask,
1199         };
1200         struct nfs4_getattr_res res = {
1201                 .fattr = fattr,
1202                 .server = server,
1203         };
1204         struct rpc_message msg = {
1205                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1206                 .rpc_argp = &args,
1207                 .rpc_resp = &res,
1208         };
1209
1210         fattr->valid = 0;
1211         return rpc_call_sync(server->client, &msg, 0);
1212 }
1213
1214 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1215 {
1216         struct nfs4_exception exception = { };
1217         int err;
1218         do {
1219                 err = nfs4_handle_exception(server,
1220                                 _nfs4_proc_getattr(server, fhandle, fattr),
1221                                 &exception);
1222         } while (exception.retry);
1223         return err;
1224 }
1225
1226 /*
1227  * The file is not closed if it is opened due to the a request to change
1228  * the size of the file. The open call will not be needed once the
1229  * VFS layer lookup-intents are implemented.
1230  *
1231  * Close is called when the inode is destroyed.
1232  * If we haven't opened the file for O_WRONLY, we
1233  * need to in the size_change case to obtain a stateid.
1234  *
1235  * Got race?
1236  * Because OPEN is always done by name in nfsv4, it is
1237  * possible that we opened a different file by the same
1238  * name.  We can recognize this race condition, but we
1239  * can't do anything about it besides returning an error.
1240  *
1241  * This will be fixed with VFS changes (lookup-intent).
1242  */
1243 static int
1244 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1245                   struct iattr *sattr)
1246 {
1247         struct rpc_cred *cred;
1248         struct inode *inode = dentry->d_inode;
1249         struct nfs4_state *state;
1250         int status;
1251
1252         fattr->valid = 0;
1253
1254         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1255         if (IS_ERR(cred))
1256                 return PTR_ERR(cred);
1257         /* Search for an existing WRITE delegation first */
1258         state = nfs4_open_delegated(inode, FMODE_WRITE, cred);
1259         if (!IS_ERR(state)) {
1260                 /* NB: nfs4_open_delegated() bumps the inode->i_count */
1261                 iput(inode);
1262         } else {
1263                 /* Search for an existing open(O_WRITE) stateid */
1264                 state = nfs4_find_state(inode, cred, FMODE_WRITE);
1265         }
1266
1267         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1268                         NFS_FH(inode), sattr, state);
1269         if (status == 0)
1270                 nfs_setattr_update_inode(inode, sattr);
1271         if (state != NULL)
1272                 nfs4_close_state(state, FMODE_WRITE);
1273         put_rpccred(cred);
1274         return status;
1275 }
1276
1277 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1278                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1279 {
1280         int                    status;
1281         struct nfs_server *server = NFS_SERVER(dir);
1282         struct nfs4_lookup_arg args = {
1283                 .bitmask = server->attr_bitmask,
1284                 .dir_fh = NFS_FH(dir),
1285                 .name = name,
1286         };
1287         struct nfs4_lookup_res res = {
1288                 .server = server,
1289                 .fattr = fattr,
1290                 .fh = fhandle,
1291         };
1292         struct rpc_message msg = {
1293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1294                 .rpc_argp = &args,
1295                 .rpc_resp = &res,
1296         };
1297
1298         fattr->valid = 0;
1299
1300         dprintk("NFS call  lookup %s\n", name->name);
1301         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1302         dprintk("NFS reply lookup: %d\n", status);
1303         return status;
1304 }
1305
1306 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1307 {
1308         struct nfs4_exception exception = { };
1309         int err;
1310         do {
1311                 err = nfs4_handle_exception(NFS_SERVER(dir),
1312                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1313                                 &exception);
1314         } while (exception.retry);
1315         return err;
1316 }
1317
1318 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1319 {
1320         struct nfs4_accessargs args = {
1321                 .fh = NFS_FH(inode),
1322         };
1323         struct nfs4_accessres res = { 0 };
1324         struct rpc_message msg = {
1325                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1326                 .rpc_argp = &args,
1327                 .rpc_resp = &res,
1328                 .rpc_cred = entry->cred,
1329         };
1330         int mode = entry->mask;
1331         int status;
1332
1333         /*
1334          * Determine which access bits we want to ask for...
1335          */
1336         if (mode & MAY_READ)
1337                 args.access |= NFS4_ACCESS_READ;
1338         if (S_ISDIR(inode->i_mode)) {
1339                 if (mode & MAY_WRITE)
1340                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1341                 if (mode & MAY_EXEC)
1342                         args.access |= NFS4_ACCESS_LOOKUP;
1343         } else {
1344                 if (mode & MAY_WRITE)
1345                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1346                 if (mode & MAY_EXEC)
1347                         args.access |= NFS4_ACCESS_EXECUTE;
1348         }
1349         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1350         if (!status) {
1351                 entry->mask = 0;
1352                 if (res.access & NFS4_ACCESS_READ)
1353                         entry->mask |= MAY_READ;
1354                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1355                         entry->mask |= MAY_WRITE;
1356                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1357                         entry->mask |= MAY_EXEC;
1358         }
1359         return status;
1360 }
1361
1362 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1363 {
1364         struct nfs4_exception exception = { };
1365         int err;
1366         do {
1367                 err = nfs4_handle_exception(NFS_SERVER(inode),
1368                                 _nfs4_proc_access(inode, entry),
1369                                 &exception);
1370         } while (exception.retry);
1371         return err;
1372 }
1373
1374 /*
1375  * TODO: For the time being, we don't try to get any attributes
1376  * along with any of the zero-copy operations READ, READDIR,
1377  * READLINK, WRITE.
1378  *
1379  * In the case of the first three, we want to put the GETATTR
1380  * after the read-type operation -- this is because it is hard
1381  * to predict the length of a GETATTR response in v4, and thus
1382  * align the READ data correctly.  This means that the GETATTR
1383  * may end up partially falling into the page cache, and we should
1384  * shift it into the 'tail' of the xdr_buf before processing.
1385  * To do this efficiently, we need to know the total length
1386  * of data received, which doesn't seem to be available outside
1387  * of the RPC layer.
1388  *
1389  * In the case of WRITE, we also want to put the GETATTR after
1390  * the operation -- in this case because we want to make sure
1391  * we get the post-operation mtime and size.  This means that
1392  * we can't use xdr_encode_pages() as written: we need a variant
1393  * of it which would leave room in the 'tail' iovec.
1394  *
1395  * Both of these changes to the XDR layer would in fact be quite
1396  * minor, but I decided to leave them for a subsequent patch.
1397  */
1398 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1399                 unsigned int pgbase, unsigned int pglen)
1400 {
1401         struct nfs4_readlink args = {
1402                 .fh       = NFS_FH(inode),
1403                 .pgbase   = pgbase,
1404                 .pglen    = pglen,
1405                 .pages    = &page,
1406         };
1407         struct rpc_message msg = {
1408                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1409                 .rpc_argp = &args,
1410                 .rpc_resp = NULL,
1411         };
1412
1413         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1414 }
1415
1416 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1417                 unsigned int pgbase, unsigned int pglen)
1418 {
1419         struct nfs4_exception exception = { };
1420         int err;
1421         do {
1422                 err = nfs4_handle_exception(NFS_SERVER(inode),
1423                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1424                                 &exception);
1425         } while (exception.retry);
1426         return err;
1427 }
1428
1429 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1430 {
1431         int flags = rdata->flags;
1432         struct inode *inode = rdata->inode;
1433         struct nfs_fattr *fattr = rdata->res.fattr;
1434         struct nfs_server *server = NFS_SERVER(inode);
1435         struct rpc_message msg = {
1436                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1437                 .rpc_argp       = &rdata->args,
1438                 .rpc_resp       = &rdata->res,
1439                 .rpc_cred       = rdata->cred,
1440         };
1441         unsigned long timestamp = jiffies;
1442         int status;
1443
1444         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1445                         (long long) rdata->args.offset);
1446
1447         fattr->valid = 0;
1448         status = rpc_call_sync(server->client, &msg, flags);
1449         if (!status)
1450                 renew_lease(server, timestamp);
1451         dprintk("NFS reply read: %d\n", status);
1452         return status;
1453 }
1454
1455 static int nfs4_proc_read(struct nfs_read_data *rdata)
1456 {
1457         struct nfs4_exception exception = { };
1458         int err;
1459         do {
1460                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1461                                 _nfs4_proc_read(rdata),
1462                                 &exception);
1463         } while (exception.retry);
1464         return err;
1465 }
1466
1467 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1468 {
1469         int rpcflags = wdata->flags;
1470         struct inode *inode = wdata->inode;
1471         struct nfs_fattr *fattr = wdata->res.fattr;
1472         struct nfs_server *server = NFS_SERVER(inode);
1473         struct rpc_message msg = {
1474                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1475                 .rpc_argp       = &wdata->args,
1476                 .rpc_resp       = &wdata->res,
1477                 .rpc_cred       = wdata->cred,
1478         };
1479         int status;
1480
1481         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1482                         (long long) wdata->args.offset);
1483
1484         fattr->valid = 0;
1485         status = rpc_call_sync(server->client, &msg, rpcflags);
1486         dprintk("NFS reply write: %d\n", status);
1487         return status;
1488 }
1489
1490 static int nfs4_proc_write(struct nfs_write_data *wdata)
1491 {
1492         struct nfs4_exception exception = { };
1493         int err;
1494         do {
1495                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1496                                 _nfs4_proc_write(wdata),
1497                                 &exception);
1498         } while (exception.retry);
1499         return err;
1500 }
1501
1502 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1503 {
1504         struct inode *inode = cdata->inode;
1505         struct nfs_fattr *fattr = cdata->res.fattr;
1506         struct nfs_server *server = NFS_SERVER(inode);
1507         struct rpc_message msg = {
1508                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1509                 .rpc_argp       = &cdata->args,
1510                 .rpc_resp       = &cdata->res,
1511                 .rpc_cred       = cdata->cred,
1512         };
1513         int status;
1514
1515         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1516                         (long long) cdata->args.offset);
1517
1518         fattr->valid = 0;
1519         status = rpc_call_sync(server->client, &msg, 0);
1520         dprintk("NFS reply commit: %d\n", status);
1521         return status;
1522 }
1523
1524 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1525 {
1526         struct nfs4_exception exception = { };
1527         int err;
1528         do {
1529                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1530                                 _nfs4_proc_commit(cdata),
1531                                 &exception);
1532         } while (exception.retry);
1533         return err;
1534 }
1535
1536 /*
1537  * Got race?
1538  * We will need to arrange for the VFS layer to provide an atomic open.
1539  * Until then, this create/open method is prone to inefficiency and race
1540  * conditions due to the lookup, create, and open VFS calls from sys_open()
1541  * placed on the wire.
1542  *
1543  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1544  * The file will be opened again in the subsequent VFS open call
1545  * (nfs4_proc_file_open).
1546  *
1547  * The open for read will just hang around to be used by any process that
1548  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1549  */
1550
1551 static int
1552 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1553                  int flags, struct nameidata *nd)
1554 {
1555         struct nfs4_state *state;
1556         struct rpc_cred *cred;
1557         int status = 0;
1558
1559         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1560         if (IS_ERR(cred)) {
1561                 status = PTR_ERR(cred);
1562                 goto out;
1563         }
1564         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1565         put_rpccred(cred);
1566         if (IS_ERR(state)) {
1567                 status = PTR_ERR(state);
1568                 goto out;
1569         }
1570         d_instantiate(dentry, state->inode);
1571         if (flags & O_EXCL) {
1572                 struct nfs_fattr fattr;
1573                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1574                                      NFS_FH(state->inode), sattr, state);
1575                 if (status == 0)
1576                         nfs_setattr_update_inode(state->inode, sattr);
1577         }
1578         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1579                 nfs4_intent_set_file(nd, dentry, state);
1580         else
1581                 nfs4_close_state(state, flags);
1582 out:
1583         return status;
1584 }
1585
1586 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1587 {
1588         struct nfs4_remove_arg args = {
1589                 .fh = NFS_FH(dir),
1590                 .name = name,
1591         };
1592         struct nfs4_change_info res;
1593         struct rpc_message msg = {
1594                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1595                 .rpc_argp       = &args,
1596                 .rpc_resp       = &res,
1597         };
1598         int                     status;
1599
1600         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1601         if (status == 0)
1602                 update_changeattr(dir, &res);
1603         return status;
1604 }
1605
1606 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1607 {
1608         struct nfs4_exception exception = { };
1609         int err;
1610         do {
1611                 err = nfs4_handle_exception(NFS_SERVER(dir),
1612                                 _nfs4_proc_remove(dir, name),
1613                                 &exception);
1614         } while (exception.retry);
1615         return err;
1616 }
1617
1618 struct unlink_desc {
1619         struct nfs4_remove_arg  args;
1620         struct nfs4_change_info res;
1621 };
1622
1623 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1624                 struct qstr *name)
1625 {
1626         struct unlink_desc *up;
1627
1628         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1629         if (!up)
1630                 return -ENOMEM;
1631
1632         up->args.fh = NFS_FH(dir->d_inode);
1633         up->args.name = name;
1634
1635         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1636         msg->rpc_argp = &up->args;
1637         msg->rpc_resp = &up->res;
1638         return 0;
1639 }
1640
1641 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1642 {
1643         struct rpc_message *msg = &task->tk_msg;
1644         struct unlink_desc *up;
1645
1646         if (msg->rpc_resp != NULL) {
1647                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1648                 update_changeattr(dir->d_inode, &up->res);
1649                 kfree(up);
1650                 msg->rpc_resp = NULL;
1651                 msg->rpc_argp = NULL;
1652         }
1653         return 0;
1654 }
1655
1656 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1657                 struct inode *new_dir, struct qstr *new_name)
1658 {
1659         struct nfs4_rename_arg arg = {
1660                 .old_dir = NFS_FH(old_dir),
1661                 .new_dir = NFS_FH(new_dir),
1662                 .old_name = old_name,
1663                 .new_name = new_name,
1664         };
1665         struct nfs4_rename_res res = { };
1666         struct rpc_message msg = {
1667                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1668                 .rpc_argp = &arg,
1669                 .rpc_resp = &res,
1670         };
1671         int                     status;
1672
1673         status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
1674
1675         if (!status) {
1676                 update_changeattr(old_dir, &res.old_cinfo);
1677                 update_changeattr(new_dir, &res.new_cinfo);
1678         }
1679         return status;
1680 }
1681
1682 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1683                 struct inode *new_dir, struct qstr *new_name)
1684 {
1685         struct nfs4_exception exception = { };
1686         int err;
1687         do {
1688                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1689                                 _nfs4_proc_rename(old_dir, old_name,
1690                                         new_dir, new_name),
1691                                 &exception);
1692         } while (exception.retry);
1693         return err;
1694 }
1695
1696 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1697 {
1698         struct nfs4_link_arg arg = {
1699                 .fh     = NFS_FH(inode),
1700                 .dir_fh = NFS_FH(dir),
1701                 .name   = name,
1702         };
1703         struct nfs4_change_info cinfo = { };
1704         struct rpc_message msg = {
1705                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1706                 .rpc_argp = &arg,
1707                 .rpc_resp = &cinfo,
1708         };
1709         int                     status;
1710
1711         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1712         if (!status)
1713                 update_changeattr(dir, &cinfo);
1714
1715         return status;
1716 }
1717
1718 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1719 {
1720         struct nfs4_exception exception = { };
1721         int err;
1722         do {
1723                 err = nfs4_handle_exception(NFS_SERVER(inode),
1724                                 _nfs4_proc_link(inode, dir, name),
1725                                 &exception);
1726         } while (exception.retry);
1727         return err;
1728 }
1729
1730 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1731                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1732                 struct nfs_fattr *fattr)
1733 {
1734         struct nfs_server *server = NFS_SERVER(dir);
1735         struct nfs4_create_arg arg = {
1736                 .dir_fh = NFS_FH(dir),
1737                 .server = server,
1738                 .name = name,
1739                 .attrs = sattr,
1740                 .ftype = NF4LNK,
1741                 .bitmask = server->attr_bitmask,
1742         };
1743         struct nfs4_create_res res = {
1744                 .server = server,
1745                 .fh = fhandle,
1746                 .fattr = fattr,
1747         };
1748         struct rpc_message msg = {
1749                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
1750                 .rpc_argp = &arg,
1751                 .rpc_resp = &res,
1752         };
1753         int                     status;
1754
1755         if (path->len > NFS4_MAXPATHLEN)
1756                 return -ENAMETOOLONG;
1757         arg.u.symlink = path;
1758         fattr->valid = 0;
1759
1760         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1761         if (!status)
1762                 update_changeattr(dir, &res.dir_cinfo);
1763         return status;
1764 }
1765
1766 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1767                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1768                 struct nfs_fattr *fattr)
1769 {
1770         struct nfs4_exception exception = { };
1771         int err;
1772         do {
1773                 err = nfs4_handle_exception(NFS_SERVER(dir),
1774                                 _nfs4_proc_symlink(dir, name, path, sattr,
1775                                         fhandle, fattr),
1776                                 &exception);
1777         } while (exception.retry);
1778         return err;
1779 }
1780
1781 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1782                 struct iattr *sattr)
1783 {
1784         struct nfs_server *server = NFS_SERVER(dir);
1785         struct nfs_fh fhandle;
1786         struct nfs_fattr fattr;
1787         struct nfs4_create_arg arg = {
1788                 .dir_fh = NFS_FH(dir),
1789                 .server = server,
1790                 .name = &dentry->d_name,
1791                 .attrs = sattr,
1792                 .ftype = NF4DIR,
1793                 .bitmask = server->attr_bitmask,
1794         };
1795         struct nfs4_create_res res = {
1796                 .server = server,
1797                 .fh = &fhandle,
1798                 .fattr = &fattr,
1799         };
1800         struct rpc_message msg = {
1801                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1802                 .rpc_argp = &arg,
1803                 .rpc_resp = &res,
1804         };
1805         int                     status;
1806
1807         fattr.valid = 0;
1808
1809         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1810         if (!status) {
1811                 update_changeattr(dir, &res.dir_cinfo);
1812                 status = nfs_instantiate(dentry, &fhandle, &fattr);
1813         }
1814         return status;
1815 }
1816
1817 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
1818                 struct iattr *sattr)
1819 {
1820         struct nfs4_exception exception = { };
1821         int err;
1822         do {
1823                 err = nfs4_handle_exception(NFS_SERVER(dir),
1824                                 _nfs4_proc_mkdir(dir, dentry, sattr),
1825                                 &exception);
1826         } while (exception.retry);
1827         return err;
1828 }
1829
1830 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1831                   u64 cookie, struct page *page, unsigned int count, int plus)
1832 {
1833         struct inode            *dir = dentry->d_inode;
1834         struct nfs4_readdir_arg args = {
1835                 .fh = NFS_FH(dir),
1836                 .pages = &page,
1837                 .pgbase = 0,
1838                 .count = count,
1839                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
1840         };
1841         struct nfs4_readdir_res res;
1842         struct rpc_message msg = {
1843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
1844                 .rpc_argp = &args,
1845                 .rpc_resp = &res,
1846                 .rpc_cred = cred,
1847         };
1848         int                     status;
1849
1850         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
1851                         dentry->d_parent->d_name.name,
1852                         dentry->d_name.name,
1853                         (unsigned long long)cookie);
1854         lock_kernel();
1855         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
1856         res.pgbase = args.pgbase;
1857         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1858         if (status == 0)
1859                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
1860         unlock_kernel();
1861         dprintk("%s: returns %d\n", __FUNCTION__, status);
1862         return status;
1863 }
1864
1865 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
1866                   u64 cookie, struct page *page, unsigned int count, int plus)
1867 {
1868         struct nfs4_exception exception = { };
1869         int err;
1870         do {
1871                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
1872                                 _nfs4_proc_readdir(dentry, cred, cookie,
1873                                         page, count, plus),
1874                                 &exception);
1875         } while (exception.retry);
1876         return err;
1877 }
1878
1879 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1880                 struct iattr *sattr, dev_t rdev)
1881 {
1882         struct nfs_server *server = NFS_SERVER(dir);
1883         struct nfs_fh fh;
1884         struct nfs_fattr fattr;
1885         struct nfs4_create_arg arg = {
1886                 .dir_fh = NFS_FH(dir),
1887                 .server = server,
1888                 .name = &dentry->d_name,
1889                 .attrs = sattr,
1890                 .bitmask = server->attr_bitmask,
1891         };
1892         struct nfs4_create_res res = {
1893                 .server = server,
1894                 .fh = &fh,
1895                 .fattr = &fattr,
1896         };
1897         struct rpc_message msg = {
1898                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
1899                 .rpc_argp = &arg,
1900                 .rpc_resp = &res,
1901         };
1902         int                     status;
1903         int                     mode = sattr->ia_mode;
1904
1905         fattr.valid = 0;
1906
1907         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
1908         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
1909         if (S_ISFIFO(mode))
1910                 arg.ftype = NF4FIFO;
1911         else if (S_ISBLK(mode)) {
1912                 arg.ftype = NF4BLK;
1913                 arg.u.device.specdata1 = MAJOR(rdev);
1914                 arg.u.device.specdata2 = MINOR(rdev);
1915         }
1916         else if (S_ISCHR(mode)) {
1917                 arg.ftype = NF4CHR;
1918                 arg.u.device.specdata1 = MAJOR(rdev);
1919                 arg.u.device.specdata2 = MINOR(rdev);
1920         }
1921         else
1922                 arg.ftype = NF4SOCK;
1923
1924         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1925         if (status == 0) {
1926                 update_changeattr(dir, &res.dir_cinfo);
1927                 status = nfs_instantiate(dentry, &fh, &fattr);
1928         }
1929         return status;
1930 }
1931
1932 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
1933                 struct iattr *sattr, dev_t rdev)
1934 {
1935         struct nfs4_exception exception = { };
1936         int err;
1937         do {
1938                 err = nfs4_handle_exception(NFS_SERVER(dir),
1939                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
1940                                 &exception);
1941         } while (exception.retry);
1942         return err;
1943 }
1944
1945 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
1946                  struct nfs_fsstat *fsstat)
1947 {
1948         struct nfs4_statfs_arg args = {
1949                 .fh = fhandle,
1950                 .bitmask = server->attr_bitmask,
1951         };
1952         struct rpc_message msg = {
1953                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
1954                 .rpc_argp = &args,
1955                 .rpc_resp = fsstat,
1956         };
1957
1958         fsstat->fattr->valid = 0;
1959         return rpc_call_sync(server->client, &msg, 0);
1960 }
1961
1962 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
1963 {
1964         struct nfs4_exception exception = { };
1965         int err;
1966         do {
1967                 err = nfs4_handle_exception(server,
1968                                 _nfs4_proc_statfs(server, fhandle, fsstat),
1969                                 &exception);
1970         } while (exception.retry);
1971         return err;
1972 }
1973
1974 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
1975                 struct nfs_fsinfo *fsinfo)
1976 {
1977         struct nfs4_fsinfo_arg args = {
1978                 .fh = fhandle,
1979                 .bitmask = server->attr_bitmask,
1980         };
1981         struct rpc_message msg = {
1982                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
1983                 .rpc_argp = &args,
1984                 .rpc_resp = fsinfo,
1985         };
1986
1987         return rpc_call_sync(server->client, &msg, 0);
1988 }
1989
1990 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
1991 {
1992         struct nfs4_exception exception = { };
1993         int err;
1994
1995         do {
1996                 err = nfs4_handle_exception(server,
1997                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
1998                                 &exception);
1999         } while (exception.retry);
2000         return err;
2001 }
2002
2003 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2004 {
2005         fsinfo->fattr->valid = 0;
2006         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2007 }
2008
2009 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2010                 struct nfs_pathconf *pathconf)
2011 {
2012         struct nfs4_pathconf_arg args = {
2013                 .fh = fhandle,
2014                 .bitmask = server->attr_bitmask,
2015         };
2016         struct rpc_message msg = {
2017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2018                 .rpc_argp = &args,
2019                 .rpc_resp = pathconf,
2020         };
2021
2022         /* None of the pathconf attributes are mandatory to implement */
2023         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2024                 memset(pathconf, 0, sizeof(*pathconf));
2025                 return 0;
2026         }
2027
2028         pathconf->fattr->valid = 0;
2029         return rpc_call_sync(server->client, &msg, 0);
2030 }
2031
2032 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2033                 struct nfs_pathconf *pathconf)
2034 {
2035         struct nfs4_exception exception = { };
2036         int err;
2037
2038         do {
2039                 err = nfs4_handle_exception(server,
2040                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2041                                 &exception);
2042         } while (exception.retry);
2043         return err;
2044 }
2045
2046 static void
2047 nfs4_read_done(struct rpc_task *task)
2048 {
2049         struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata;
2050         struct inode *inode = data->inode;
2051
2052         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2053                 rpc_restart_call(task);
2054                 return;
2055         }
2056         if (task->tk_status > 0)
2057                 renew_lease(NFS_SERVER(inode), data->timestamp);
2058         /* Call back common NFS readpage processing */
2059         nfs_readpage_result(task);
2060 }
2061
2062 static void
2063 nfs4_proc_read_setup(struct nfs_read_data *data)
2064 {
2065         struct rpc_task *task = &data->task;
2066         struct rpc_message msg = {
2067                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2068                 .rpc_argp = &data->args,
2069                 .rpc_resp = &data->res,
2070                 .rpc_cred = data->cred,
2071         };
2072         struct inode *inode = data->inode;
2073         int flags;
2074
2075         data->timestamp   = jiffies;
2076
2077         /* N.B. Do we need to test? Never called for swapfile inode */
2078         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2079
2080         /* Finalize the task. */
2081         rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags);
2082         rpc_call_setup(task, &msg, 0);
2083 }
2084
2085 static void
2086 nfs4_write_done(struct rpc_task *task)
2087 {
2088         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2089         struct inode *inode = data->inode;
2090
2091         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2092                 rpc_restart_call(task);
2093                 return;
2094         }
2095         if (task->tk_status >= 0)
2096                 renew_lease(NFS_SERVER(inode), data->timestamp);
2097         /* Call back common NFS writeback processing */
2098         nfs_writeback_done(task);
2099 }
2100
2101 static void
2102 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2103 {
2104         struct rpc_task *task = &data->task;
2105         struct rpc_message msg = {
2106                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2107                 .rpc_argp = &data->args,
2108                 .rpc_resp = &data->res,
2109                 .rpc_cred = data->cred,
2110         };
2111         struct inode *inode = data->inode;
2112         int stable;
2113         int flags;
2114
2115         if (how & FLUSH_STABLE) {
2116                 if (!NFS_I(inode)->ncommit)
2117                         stable = NFS_FILE_SYNC;
2118                 else
2119                         stable = NFS_DATA_SYNC;
2120         } else
2121                 stable = NFS_UNSTABLE;
2122         data->args.stable = stable;
2123
2124         data->timestamp   = jiffies;
2125
2126         /* Set the initial flags for the task.  */
2127         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2128
2129         /* Finalize the task. */
2130         rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags);
2131         rpc_call_setup(task, &msg, 0);
2132 }
2133
2134 static void
2135 nfs4_commit_done(struct rpc_task *task)
2136 {
2137         struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;
2138         struct inode *inode = data->inode;
2139
2140         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2141                 rpc_restart_call(task);
2142                 return;
2143         }
2144         /* Call back common NFS writeback processing */
2145         nfs_commit_done(task);
2146 }
2147
2148 static void
2149 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2150 {
2151         struct rpc_task *task = &data->task;
2152         struct rpc_message msg = {
2153                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2154                 .rpc_argp = &data->args,
2155                 .rpc_resp = &data->res,
2156                 .rpc_cred = data->cred,
2157         };
2158         struct inode *inode = data->inode;
2159         int flags;
2160
2161         /* Set the initial flags for the task.  */
2162         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2163
2164         /* Finalize the task. */
2165         rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags);
2166         rpc_call_setup(task, &msg, 0);
2167 }
2168
2169 /*
2170  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2171  * standalone procedure for queueing an asynchronous RENEW.
2172  */
2173 static void
2174 renew_done(struct rpc_task *task)
2175 {
2176         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2177         unsigned long timestamp = (unsigned long)task->tk_calldata;
2178
2179         if (task->tk_status < 0) {
2180                 switch (task->tk_status) {
2181                         case -NFS4ERR_STALE_CLIENTID:
2182                         case -NFS4ERR_EXPIRED:
2183                         case -NFS4ERR_CB_PATH_DOWN:
2184                                 nfs4_schedule_state_recovery(clp);
2185                 }
2186                 return;
2187         }
2188         spin_lock(&clp->cl_lock);
2189         if (time_before(clp->cl_last_renewal,timestamp))
2190                 clp->cl_last_renewal = timestamp;
2191         spin_unlock(&clp->cl_lock);
2192 }
2193
2194 int
2195 nfs4_proc_async_renew(struct nfs4_client *clp)
2196 {
2197         struct rpc_message msg = {
2198                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2199                 .rpc_argp       = clp,
2200                 .rpc_cred       = clp->cl_cred,
2201         };
2202
2203         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2204                         renew_done, (void *)jiffies);
2205 }
2206
2207 int
2208 nfs4_proc_renew(struct nfs4_client *clp)
2209 {
2210         struct rpc_message msg = {
2211                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2212                 .rpc_argp       = clp,
2213                 .rpc_cred       = clp->cl_cred,
2214         };
2215         unsigned long now = jiffies;
2216         int status;
2217
2218         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2219         if (status < 0)
2220                 return status;
2221         spin_lock(&clp->cl_lock);
2222         if (time_before(clp->cl_last_renewal,now))
2223                 clp->cl_last_renewal = now;
2224         spin_unlock(&clp->cl_lock);
2225         return 0;
2226 }
2227
2228 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2229 {
2230         return (server->caps & NFS_CAP_ACLS)
2231                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2232                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2233 }
2234
2235 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2236  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2237  * the stack.
2238  */
2239 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2240
2241 static void buf_to_pages(const void *buf, size_t buflen,
2242                 struct page **pages, unsigned int *pgbase)
2243 {
2244         const void *p = buf;
2245
2246         *pgbase = offset_in_page(buf);
2247         p -= *pgbase;
2248         while (p < buf + buflen) {
2249                 *(pages++) = virt_to_page(p);
2250                 p += PAGE_CACHE_SIZE;
2251         }
2252 }
2253
2254 struct nfs4_cached_acl {
2255         int cached;
2256         size_t len;
2257         char data[0];
2258 };
2259
2260 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2261 {
2262         struct nfs_inode *nfsi = NFS_I(inode);
2263
2264         spin_lock(&inode->i_lock);
2265         kfree(nfsi->nfs4_acl);
2266         nfsi->nfs4_acl = acl;
2267         spin_unlock(&inode->i_lock);
2268 }
2269
2270 static void nfs4_zap_acl_attr(struct inode *inode)
2271 {
2272         nfs4_set_cached_acl(inode, NULL);
2273 }
2274
2275 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2276 {
2277         struct nfs_inode *nfsi = NFS_I(inode);
2278         struct nfs4_cached_acl *acl;
2279         int ret = -ENOENT;
2280
2281         spin_lock(&inode->i_lock);
2282         acl = nfsi->nfs4_acl;
2283         if (acl == NULL)
2284                 goto out;
2285         if (buf == NULL) /* user is just asking for length */
2286                 goto out_len;
2287         if (acl->cached == 0)
2288                 goto out;
2289         ret = -ERANGE; /* see getxattr(2) man page */
2290         if (acl->len > buflen)
2291                 goto out;
2292         memcpy(buf, acl->data, acl->len);
2293 out_len:
2294         ret = acl->len;
2295 out:
2296         spin_unlock(&inode->i_lock);
2297         return ret;
2298 }
2299
2300 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2301 {
2302         struct nfs4_cached_acl *acl;
2303
2304         if (buf && acl_len <= PAGE_SIZE) {
2305                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2306                 if (acl == NULL)
2307                         goto out;
2308                 acl->cached = 1;
2309                 memcpy(acl->data, buf, acl_len);
2310         } else {
2311                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2312                 if (acl == NULL)
2313                         goto out;
2314                 acl->cached = 0;
2315         }
2316         acl->len = acl_len;
2317 out:
2318         nfs4_set_cached_acl(inode, acl);
2319 }
2320
2321 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2322 {
2323         struct page *pages[NFS4ACL_MAXPAGES];
2324         struct nfs_getaclargs args = {
2325                 .fh = NFS_FH(inode),
2326                 .acl_pages = pages,
2327                 .acl_len = buflen,
2328         };
2329         size_t resp_len = buflen;
2330         void *resp_buf;
2331         struct rpc_message msg = {
2332                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2333                 .rpc_argp = &args,
2334                 .rpc_resp = &resp_len,
2335         };
2336         struct page *localpage = NULL;
2337         int ret;
2338
2339         if (buflen < PAGE_SIZE) {
2340                 /* As long as we're doing a round trip to the server anyway,
2341                  * let's be prepared for a page of acl data. */
2342                 localpage = alloc_page(GFP_KERNEL);
2343                 resp_buf = page_address(localpage);
2344                 if (localpage == NULL)
2345                         return -ENOMEM;
2346                 args.acl_pages[0] = localpage;
2347                 args.acl_pgbase = 0;
2348                 args.acl_len = PAGE_SIZE;
2349         } else {
2350                 resp_buf = buf;
2351                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2352         }
2353         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2354         if (ret)
2355                 goto out_free;
2356         if (resp_len > args.acl_len)
2357                 nfs4_write_cached_acl(inode, NULL, resp_len);
2358         else
2359                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2360         if (buf) {
2361                 ret = -ERANGE;
2362                 if (resp_len > buflen)
2363                         goto out_free;
2364                 if (localpage)
2365                         memcpy(buf, resp_buf, resp_len);
2366         }
2367         ret = resp_len;
2368 out_free:
2369         if (localpage)
2370                 __free_page(localpage);
2371         return ret;
2372 }
2373
2374 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2375 {
2376         struct nfs_server *server = NFS_SERVER(inode);
2377         int ret;
2378
2379         if (!nfs4_server_supports_acls(server))
2380                 return -EOPNOTSUPP;
2381         ret = nfs_revalidate_inode(server, inode);
2382         if (ret < 0)
2383                 return ret;
2384         ret = nfs4_read_cached_acl(inode, buf, buflen);
2385         if (ret != -ENOENT)
2386                 return ret;
2387         return nfs4_get_acl_uncached(inode, buf, buflen);
2388 }
2389
2390 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2391 {
2392         struct nfs_server *server = NFS_SERVER(inode);
2393         struct page *pages[NFS4ACL_MAXPAGES];
2394         struct nfs_setaclargs arg = {
2395                 .fh             = NFS_FH(inode),
2396                 .acl_pages      = pages,
2397                 .acl_len        = buflen,
2398         };
2399         struct rpc_message msg = {
2400                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2401                 .rpc_argp       = &arg,
2402                 .rpc_resp       = NULL,
2403         };
2404         int ret;
2405
2406         if (!nfs4_server_supports_acls(server))
2407                 return -EOPNOTSUPP;
2408         nfs_inode_return_delegation(inode);
2409         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2410         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2411         if (ret == 0)
2412                 nfs4_write_cached_acl(inode, buf, buflen);
2413         return ret;
2414 }
2415
2416 static int
2417 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2418 {
2419         struct nfs4_client *clp = server->nfs4_state;
2420
2421         if (!clp || task->tk_status >= 0)
2422                 return 0;
2423         switch(task->tk_status) {
2424                 case -NFS4ERR_STALE_CLIENTID:
2425                 case -NFS4ERR_STALE_STATEID:
2426                 case -NFS4ERR_EXPIRED:
2427                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2428                         nfs4_schedule_state_recovery(clp);
2429                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2430                                 rpc_wake_up_task(task);
2431                         task->tk_status = 0;
2432                         return -EAGAIN;
2433                 case -NFS4ERR_GRACE:
2434                 case -NFS4ERR_DELAY:
2435                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2436                         task->tk_status = 0;
2437                         return -EAGAIN;
2438                 case -NFS4ERR_OLD_STATEID:
2439                         task->tk_status = 0;
2440                         return -EAGAIN;
2441         }
2442         task->tk_status = nfs4_map_errors(task->tk_status);
2443         return 0;
2444 }
2445
2446 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2447 {
2448         DEFINE_WAIT(wait);
2449         sigset_t oldset;
2450         int interruptible, res = 0;
2451
2452         might_sleep();
2453
2454         rpc_clnt_sigmask(clnt, &oldset);
2455         interruptible = TASK_UNINTERRUPTIBLE;
2456         if (clnt->cl_intr)
2457                 interruptible = TASK_INTERRUPTIBLE;
2458         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2459         nfs4_schedule_state_recovery(clp);
2460         if (clnt->cl_intr && signalled())
2461                 res = -ERESTARTSYS;
2462         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2463                 schedule();
2464         finish_wait(&clp->cl_waitq, &wait);
2465         rpc_clnt_sigunmask(clnt, &oldset);
2466         return res;
2467 }
2468
2469 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2470 {
2471         sigset_t oldset;
2472         int res = 0;
2473
2474         might_sleep();
2475
2476         if (*timeout <= 0)
2477                 *timeout = NFS4_POLL_RETRY_MIN;
2478         if (*timeout > NFS4_POLL_RETRY_MAX)
2479                 *timeout = NFS4_POLL_RETRY_MAX;
2480         rpc_clnt_sigmask(clnt, &oldset);
2481         if (clnt->cl_intr) {
2482                 schedule_timeout_interruptible(*timeout);
2483                 if (signalled())
2484                         res = -ERESTARTSYS;
2485         } else
2486                 schedule_timeout_uninterruptible(*timeout);
2487         rpc_clnt_sigunmask(clnt, &oldset);
2488         *timeout <<= 1;
2489         return res;
2490 }
2491
2492 /* This is the error handling routine for processes that are allowed
2493  * to sleep.
2494  */
2495 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2496 {
2497         struct nfs4_client *clp = server->nfs4_state;
2498         int ret = errorcode;
2499
2500         exception->retry = 0;
2501         switch(errorcode) {
2502                 case 0:
2503                         return 0;
2504                 case -NFS4ERR_STALE_CLIENTID:
2505                 case -NFS4ERR_STALE_STATEID:
2506                 case -NFS4ERR_EXPIRED:
2507                         ret = nfs4_wait_clnt_recover(server->client, clp);
2508                         if (ret == 0)
2509                                 exception->retry = 1;
2510                         break;
2511                 case -NFS4ERR_GRACE:
2512                 case -NFS4ERR_DELAY:
2513                         ret = nfs4_delay(server->client, &exception->timeout);
2514                         if (ret == 0)
2515                                 exception->retry = 1;
2516                         break;
2517                 case -NFS4ERR_OLD_STATEID:
2518                         if (ret == 0)
2519                                 exception->retry = 1;
2520         }
2521         /* We failed to handle the error */
2522         return nfs4_map_errors(ret);
2523 }
2524
2525 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2526 {
2527         nfs4_verifier sc_verifier;
2528         struct nfs4_setclientid setclientid = {
2529                 .sc_verifier = &sc_verifier,
2530                 .sc_prog = program,
2531         };
2532         struct rpc_message msg = {
2533                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2534                 .rpc_argp = &setclientid,
2535                 .rpc_resp = clp,
2536                 .rpc_cred = clp->cl_cred,
2537         };
2538         u32 *p;
2539         int loop = 0;
2540         int status;
2541
2542         p = (u32*)sc_verifier.data;
2543         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2544         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2545
2546         for(;;) {
2547                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2548                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2549                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2550                                 clp->cl_cred->cr_ops->cr_name,
2551                                 clp->cl_id_uniquifier);
2552                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2553                                 sizeof(setclientid.sc_netid), "tcp");
2554                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2555                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2556                                 clp->cl_ipaddr, port >> 8, port & 255);
2557
2558                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2559                 if (status != -NFS4ERR_CLID_INUSE)
2560                         break;
2561                 if (signalled())
2562                         break;
2563                 if (loop++ & 1)
2564                         ssleep(clp->cl_lease_time + 1);
2565                 else
2566                         if (++clp->cl_id_uniquifier == 0)
2567                                 break;
2568         }
2569         return status;
2570 }
2571
2572 int
2573 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2574 {
2575         struct nfs_fsinfo fsinfo;
2576         struct rpc_message msg = {
2577                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2578                 .rpc_argp = clp,
2579                 .rpc_resp = &fsinfo,
2580                 .rpc_cred = clp->cl_cred,
2581         };
2582         unsigned long now;
2583         int status;
2584
2585         now = jiffies;
2586         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2587         if (status == 0) {
2588                 spin_lock(&clp->cl_lock);
2589                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2590                 clp->cl_last_renewal = now;
2591                 spin_unlock(&clp->cl_lock);
2592         }
2593         return status;
2594 }
2595
2596 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2597 {
2598         struct nfs4_delegreturnargs args = {
2599                 .fhandle = NFS_FH(inode),
2600                 .stateid = stateid,
2601         };
2602         struct rpc_message msg = {
2603                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2604                 .rpc_argp = &args,
2605                 .rpc_cred = cred,
2606         };
2607
2608         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2609 }
2610
2611 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2612 {
2613         struct nfs_server *server = NFS_SERVER(inode);
2614         struct nfs4_exception exception = { };
2615         int err;
2616         do {
2617                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2618                 switch (err) {
2619                         case -NFS4ERR_STALE_STATEID:
2620                         case -NFS4ERR_EXPIRED:
2621                                 nfs4_schedule_state_recovery(server->nfs4_state);
2622                         case 0:
2623                                 return 0;
2624                 }
2625                 err = nfs4_handle_exception(server, err, &exception);
2626         } while (exception.retry);
2627         return err;
2628 }
2629
2630 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2631 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2632
2633 /*
2634  * sleep, with exponential backoff, and retry the LOCK operation.
2635  */
2636 static unsigned long
2637 nfs4_set_lock_task_retry(unsigned long timeout)
2638 {
2639         schedule_timeout_interruptible(timeout);
2640         timeout <<= 1;
2641         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2642                 return NFS4_LOCK_MAXTIMEOUT;
2643         return timeout;
2644 }
2645
2646 static inline int
2647 nfs4_lck_type(int cmd, struct file_lock *request)
2648 {
2649         /* set lock type */
2650         switch (request->fl_type) {
2651                 case F_RDLCK:
2652                         return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT;
2653                 case F_WRLCK:
2654                         return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
2655                 case F_UNLCK:
2656                         return NFS4_WRITE_LT;
2657         }
2658         BUG();
2659         return 0;
2660 }
2661
2662 static inline uint64_t
2663 nfs4_lck_length(struct file_lock *request)
2664 {
2665         if (request->fl_end == OFFSET_MAX)
2666                 return ~(uint64_t)0;
2667         return request->fl_end - request->fl_start + 1;
2668 }
2669
2670 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2671 {
2672         struct inode *inode = state->inode;
2673         struct nfs_server *server = NFS_SERVER(inode);
2674         struct nfs4_client *clp = server->nfs4_state;
2675         struct nfs_lockargs arg = {
2676                 .fh = NFS_FH(inode),
2677                 .type = nfs4_lck_type(cmd, request),
2678                 .offset = request->fl_start,
2679                 .length = nfs4_lck_length(request),
2680         };
2681         struct nfs_lockres res = {
2682                 .server = server,
2683         };
2684         struct rpc_message msg = {
2685                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2686                 .rpc_argp       = &arg,
2687                 .rpc_resp       = &res,
2688                 .rpc_cred       = state->owner->so_cred,
2689         };
2690         struct nfs_lowner nlo;
2691         struct nfs4_lock_state *lsp;
2692         int status;
2693
2694         down_read(&clp->cl_sem);
2695         nlo.clientid = clp->cl_clientid;
2696         status = nfs4_set_lock_state(state, request);
2697         if (status != 0)
2698                 goto out;
2699         lsp = request->fl_u.nfs4_fl.owner;
2700         nlo.id = lsp->ls_id;
2701         arg.u.lockt = &nlo;
2702         status = rpc_call_sync(server->client, &msg, 0);
2703         if (!status) {
2704                 request->fl_type = F_UNLCK;
2705         } else if (status == -NFS4ERR_DENIED) {
2706                 int64_t len, start, end;
2707                 start = res.u.denied.offset;
2708                 len = res.u.denied.length;
2709                 end = start + len - 1;
2710                 if (end < 0 || len == 0)
2711                         request->fl_end = OFFSET_MAX;
2712                 else
2713                         request->fl_end = (loff_t)end;
2714                 request->fl_start = (loff_t)start;
2715                 request->fl_type = F_WRLCK;
2716                 if (res.u.denied.type & 1)
2717                         request->fl_type = F_RDLCK;
2718                 request->fl_pid = 0;
2719                 status = 0;
2720         }
2721 out:
2722         up_read(&clp->cl_sem);
2723         return status;
2724 }
2725
2726 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2727 {
2728         struct nfs4_exception exception = { };
2729         int err;
2730
2731         do {
2732                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2733                                 _nfs4_proc_getlk(state, cmd, request),
2734                                 &exception);
2735         } while (exception.retry);
2736         return err;
2737 }
2738
2739 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2740 {
2741         int res = 0;
2742         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2743                 case FL_POSIX:
2744                         res = posix_lock_file_wait(file, fl);
2745                         break;
2746                 case FL_FLOCK:
2747                         res = flock_lock_file_wait(file, fl);
2748                         break;
2749                 default:
2750                         BUG();
2751         }
2752         if (res < 0)
2753                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
2754                                 __FUNCTION__);
2755         return res;
2756 }
2757
2758 struct nfs4_unlockdata {
2759         struct nfs_lockargs arg;
2760         struct nfs_locku_opargs luargs;
2761         struct nfs_lockres res;
2762         struct nfs4_lock_state *lsp;
2763         struct nfs_open_context *ctx;
2764         atomic_t refcount;
2765         struct completion completion;
2766 };
2767
2768 static void nfs4_locku_release_calldata(struct nfs4_unlockdata *calldata)
2769 {
2770         if (atomic_dec_and_test(&calldata->refcount)) {
2771                 nfs_free_seqid(calldata->luargs.seqid);
2772                 nfs4_put_lock_state(calldata->lsp);
2773                 put_nfs_open_context(calldata->ctx);
2774                 kfree(calldata);
2775         }
2776 }
2777
2778 static void nfs4_locku_complete(struct nfs4_unlockdata *calldata)
2779 {
2780         complete(&calldata->completion);
2781         nfs4_locku_release_calldata(calldata);
2782 }
2783
2784 static void nfs4_locku_done(struct rpc_task *task)
2785 {
2786         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2787
2788         nfs_increment_lock_seqid(task->tk_status, calldata->luargs.seqid);
2789         switch (task->tk_status) {
2790                 case 0:
2791                         memcpy(calldata->lsp->ls_stateid.data,
2792                                         calldata->res.u.stateid.data,
2793                                         sizeof(calldata->lsp->ls_stateid.data));
2794                         break;
2795                 case -NFS4ERR_STALE_STATEID:
2796                 case -NFS4ERR_EXPIRED:
2797                         nfs4_schedule_state_recovery(calldata->res.server->nfs4_state);
2798                         break;
2799                 default:
2800                         if (nfs4_async_handle_error(task, calldata->res.server) == -EAGAIN) {
2801                                 rpc_restart_call(task);
2802                                 return;
2803                         }
2804         }
2805         nfs4_locku_complete(calldata);
2806 }
2807
2808 static void nfs4_locku_begin(struct rpc_task *task)
2809 {
2810         struct nfs4_unlockdata *calldata = (struct nfs4_unlockdata *)task->tk_calldata;
2811         struct rpc_message msg = {
2812                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
2813                 .rpc_argp       = &calldata->arg,
2814                 .rpc_resp       = &calldata->res,
2815                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
2816         };
2817         int status;
2818
2819         status = nfs_wait_on_sequence(calldata->luargs.seqid, task);
2820         if (status != 0)
2821                 return;
2822         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
2823                 nfs4_locku_complete(calldata);
2824                 task->tk_exit = NULL;
2825                 rpc_exit(task, 0);
2826                 return;
2827         }
2828         rpc_call_setup(task, &msg, 0);
2829 }
2830
2831 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
2832 {
2833         struct nfs4_unlockdata *calldata;
2834         struct inode *inode = state->inode;
2835         struct nfs_server *server = NFS_SERVER(inode);
2836         struct nfs4_lock_state *lsp;
2837         int status;
2838
2839         status = nfs4_set_lock_state(state, request);
2840         if (status != 0)
2841                 return status;
2842         lsp = request->fl_u.nfs4_fl.owner;
2843         /* We might have lost the locks! */
2844         if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0)
2845                 return 0;
2846         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
2847         if (calldata == NULL)
2848                 return -ENOMEM;
2849         calldata->luargs.seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2850         if (calldata->luargs.seqid == NULL) {
2851                 kfree(calldata);
2852                 return -ENOMEM;
2853         }
2854         calldata->luargs.stateid = &lsp->ls_stateid;
2855         calldata->arg.fh = NFS_FH(inode);
2856         calldata->arg.type = nfs4_lck_type(cmd, request);
2857         calldata->arg.offset = request->fl_start;
2858         calldata->arg.length = nfs4_lck_length(request);
2859         calldata->arg.u.locku = &calldata->luargs;
2860         calldata->res.server = server;
2861         calldata->lsp = lsp;
2862         atomic_inc(&lsp->ls_count);
2863
2864         /* Ensure we don't close file until we're done freeing locks! */
2865         calldata->ctx = get_nfs_open_context((struct nfs_open_context*)request->fl_file->private_data);
2866
2867         atomic_set(&calldata->refcount, 2);
2868         init_completion(&calldata->completion);
2869
2870         status = nfs4_call_async(NFS_SERVER(inode)->client, nfs4_locku_begin,
2871                         nfs4_locku_done, calldata);
2872         if (status == 0)
2873                 wait_for_completion_interruptible(&calldata->completion);
2874         do_vfs_lock(request->fl_file, request);
2875         nfs4_locku_release_calldata(calldata);
2876         return status;
2877 }
2878
2879 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim)
2880 {
2881         struct inode *inode = state->inode;
2882         struct nfs_server *server = NFS_SERVER(inode);
2883         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
2884         struct nfs_lock_opargs largs = {
2885                 .lock_stateid = &lsp->ls_stateid,
2886                 .open_stateid = &state->stateid,
2887                 .lock_owner = {
2888                         .clientid = server->nfs4_state->cl_clientid,
2889                         .id = lsp->ls_id,
2890                 },
2891                 .reclaim = reclaim,
2892         };
2893         struct nfs_lockargs arg = {
2894                 .fh = NFS_FH(inode),
2895                 .type = nfs4_lck_type(cmd, request),
2896                 .offset = request->fl_start,
2897                 .length = nfs4_lck_length(request),
2898                 .u = {
2899                         .lock = &largs,
2900                 },
2901         };
2902         struct nfs_lockres res = {
2903                 .server = server,
2904         };
2905         struct rpc_message msg = {
2906                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
2907                 .rpc_argp       = &arg,
2908                 .rpc_resp       = &res,
2909                 .rpc_cred       = state->owner->so_cred,
2910         };
2911         int status = -ENOMEM;
2912
2913         largs.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
2914         if (largs.lock_seqid == NULL)
2915                 return -ENOMEM;
2916         if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
2917                 struct nfs4_state_owner *owner = state->owner;
2918
2919                 largs.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
2920                 if (largs.open_seqid == NULL)
2921                         goto out;
2922                 largs.new_lock_owner = 1;
2923                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2924                 /* increment open seqid on success, and seqid mutating errors */
2925                 if (largs.new_lock_owner != 0) {
2926                         nfs_increment_open_seqid(status, largs.open_seqid);
2927                         if (status == 0)
2928                                 nfs_confirm_seqid(&lsp->ls_seqid, 0);
2929                 }
2930                 nfs_free_seqid(largs.open_seqid);
2931         } else
2932                 status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
2933         /* increment lock seqid on success, and seqid mutating errors*/
2934         nfs_increment_lock_seqid(status, largs.lock_seqid);
2935         /* save the returned stateid. */
2936         if (status == 0) {
2937                 memcpy(lsp->ls_stateid.data, res.u.stateid.data,
2938                                 sizeof(lsp->ls_stateid.data));
2939                 lsp->ls_flags |= NFS_LOCK_INITIALIZED;
2940         } else if (status == -NFS4ERR_DENIED)
2941                 status = -EAGAIN;
2942 out:
2943         nfs_free_seqid(largs.lock_seqid);
2944         return status;
2945 }
2946
2947 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
2948 {
2949         struct nfs_server *server = NFS_SERVER(state->inode);
2950         struct nfs4_exception exception = { };
2951         int err;
2952
2953         do {
2954                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
2955                 if (err != -NFS4ERR_DELAY)
2956                         break;
2957                 nfs4_handle_exception(server, err, &exception);
2958         } while (exception.retry);
2959         return err;
2960 }
2961
2962 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
2963 {
2964         struct nfs_server *server = NFS_SERVER(state->inode);
2965         struct nfs4_exception exception = { };
2966         int err;
2967
2968         do {
2969                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
2970                 if (err != -NFS4ERR_DELAY)
2971                         break;
2972                 nfs4_handle_exception(server, err, &exception);
2973         } while (exception.retry);
2974         return err;
2975 }
2976
2977 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2978 {
2979         struct nfs4_client *clp = state->owner->so_client;
2980         int status;
2981
2982         down_read(&clp->cl_sem);
2983         status = nfs4_set_lock_state(state, request);
2984         if (status == 0)
2985                 status = _nfs4_do_setlk(state, cmd, request, 0);
2986         if (status == 0) {
2987                 /* Note: we always want to sleep here! */
2988                 request->fl_flags |= FL_SLEEP;
2989                 if (do_vfs_lock(request->fl_file, request) < 0)
2990                         printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
2991         }
2992         up_read(&clp->cl_sem);
2993         return status;
2994 }
2995
2996 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2997 {
2998         struct nfs4_exception exception = { };
2999         int err;
3000
3001         do {
3002                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3003                                 _nfs4_proc_setlk(state, cmd, request),
3004                                 &exception);
3005         } while (exception.retry);
3006         return err;
3007 }
3008
3009 static int
3010 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3011 {
3012         struct nfs_open_context *ctx;
3013         struct nfs4_state *state;
3014         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3015         int status;
3016
3017         /* verify open state */
3018         ctx = (struct nfs_open_context *)filp->private_data;
3019         state = ctx->state;
3020
3021         if (request->fl_start < 0 || request->fl_end < 0)
3022                 return -EINVAL;
3023
3024         if (IS_GETLK(cmd))
3025                 return nfs4_proc_getlk(state, F_GETLK, request);
3026
3027         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3028                 return -EINVAL;
3029
3030         if (request->fl_type == F_UNLCK)
3031                 return nfs4_proc_unlck(state, cmd, request);
3032
3033         do {
3034                 status = nfs4_proc_setlk(state, cmd, request);
3035                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3036                         break;
3037                 timeout = nfs4_set_lock_task_retry(timeout);
3038                 status = -ERESTARTSYS;
3039                 if (signalled())
3040                         break;
3041         } while(status < 0);
3042         return status;
3043 }
3044
3045
3046 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3047
3048 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3049                 size_t buflen, int flags)
3050 {
3051         struct inode *inode = dentry->d_inode;
3052
3053         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3054                 return -EOPNOTSUPP;
3055
3056         if (!S_ISREG(inode->i_mode) &&
3057             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3058                 return -EPERM;
3059
3060         return nfs4_proc_set_acl(inode, buf, buflen);
3061 }
3062
3063 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3064  * and that's what we'll do for e.g. user attributes that haven't been set.
3065  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3066  * attributes in kernel-managed attribute namespaces. */
3067 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3068                 size_t buflen)
3069 {
3070         struct inode *inode = dentry->d_inode;
3071
3072         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3073                 return -EOPNOTSUPP;
3074
3075         return nfs4_proc_get_acl(inode, buf, buflen);
3076 }
3077
3078 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3079 {
3080         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3081
3082         if (buf && buflen < len)
3083                 return -ERANGE;
3084         if (buf)
3085                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3086         return len;
3087 }
3088
3089 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3090         .recover_open   = nfs4_open_reclaim,
3091         .recover_lock   = nfs4_lock_reclaim,
3092 };
3093
3094 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3095         .recover_open   = nfs4_open_expired,
3096         .recover_lock   = nfs4_lock_expired,
3097 };
3098
3099 static struct inode_operations nfs4_file_inode_operations = {
3100         .permission     = nfs_permission,
3101         .getattr        = nfs_getattr,
3102         .setattr        = nfs_setattr,
3103         .getxattr       = nfs4_getxattr,
3104         .setxattr       = nfs4_setxattr,
3105         .listxattr      = nfs4_listxattr,
3106 };
3107
3108 struct nfs_rpc_ops      nfs_v4_clientops = {
3109         .version        = 4,                    /* protocol version */
3110         .dentry_ops     = &nfs4_dentry_operations,
3111         .dir_inode_ops  = &nfs4_dir_inode_operations,
3112         .file_inode_ops = &nfs4_file_inode_operations,
3113         .getroot        = nfs4_proc_get_root,
3114         .getattr        = nfs4_proc_getattr,
3115         .setattr        = nfs4_proc_setattr,
3116         .lookup         = nfs4_proc_lookup,
3117         .access         = nfs4_proc_access,
3118         .readlink       = nfs4_proc_readlink,
3119         .read           = nfs4_proc_read,
3120         .write          = nfs4_proc_write,
3121         .commit         = nfs4_proc_commit,
3122         .create         = nfs4_proc_create,
3123         .remove         = nfs4_proc_remove,
3124         .unlink_setup   = nfs4_proc_unlink_setup,
3125         .unlink_done    = nfs4_proc_unlink_done,
3126         .rename         = nfs4_proc_rename,
3127         .link           = nfs4_proc_link,
3128         .symlink        = nfs4_proc_symlink,
3129         .mkdir          = nfs4_proc_mkdir,
3130         .rmdir          = nfs4_proc_remove,
3131         .readdir        = nfs4_proc_readdir,
3132         .mknod          = nfs4_proc_mknod,
3133         .statfs         = nfs4_proc_statfs,
3134         .fsinfo         = nfs4_proc_fsinfo,
3135         .pathconf       = nfs4_proc_pathconf,
3136         .decode_dirent  = nfs4_decode_dirent,
3137         .read_setup     = nfs4_proc_read_setup,
3138         .write_setup    = nfs4_proc_write_setup,
3139         .commit_setup   = nfs4_proc_commit_setup,
3140         .file_open      = nfs_open,
3141         .file_release   = nfs_release,
3142         .lock           = nfs4_proc_lock,
3143         .clear_acl_cache = nfs4_zap_acl_attr,
3144 };
3145
3146 /*
3147  * Local variables:
3148  *  c-basic-offset: 8
3149  * End:
3150  */