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 struct nfs4_opendata;
  61 static int _nfs4_proc_open(struct nfs4_opendata *data);
  62 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  63 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  64 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  66 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  67 extern struct rpc_procinfo nfs4_procedures[];
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __FUNCTION__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry,
 123                 struct nfs4_readdir_arg *readdir)
 124 {
 125         u32 *start, *p;
 126
 127         BUG_ON(readdir->count < 80);
 128         if (cookie > 2) {
 129                 readdir->cookie = cookie;
 130                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 131                 return;
 132         }
 133
 134         readdir->cookie = 0;
 135         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 136         if (cookie == 2)
 137                 return;
 138
 139         /*
 140          * NFSv4 servers do not return entries for '.' and '..'
 141          * Therefore, we fake these entries here.  We let '.'
 142          * have cookie 0 and '..' have cookie 1.  Note that
 143          * when talking to the server, we always send cookie 0
 144          * instead of 1 or 2.
 145          */
 146         start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0);
 147
 148         if (cookie == 0) {
 149                 *p++ = xdr_one;                                  /* next */
 150                 *p++ = xdr_zero;                   /* cookie, first word */
 151                 *p++ = xdr_one;                   /* cookie, second word */
 152                 *p++ = xdr_one;                             /* entry len */
 153                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 154                 p++;
 155                 *p++ = xdr_one;                         /* bitmap length */
 156                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 157                 *p++ = htonl(8);              /* attribute buffer length */
 158                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 159         }
 160
 161         *p++ = xdr_one;                                  /* next */
 162         *p++ = xdr_zero;                   /* cookie, first word */
 163         *p++ = xdr_two;                   /* cookie, second word */
 164         *p++ = xdr_two;                             /* entry len */
 165         memcpy(p, "..\0\0", 4);                         /* entry */
 166         p++;
 167         *p++ = xdr_one;                         /* bitmap length */
 168         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 169         *p++ = htonl(8);              /* attribute buffer length */
 170         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 171
 172         readdir->pgbase = (char *)p - (char *)start;
 173         readdir->count -= readdir->pgbase;
 174         kunmap_atomic(start, KM_USER0);
 175 }
 176
 177 static void
 178 renew_lease(struct nfs_server *server, unsigned long timestamp)
 179 {
 180         struct nfs4_client *clp = server->nfs4_state;
 181         spin_lock(&clp->cl_lock);
 182         if (time_before(clp->cl_last_renewal,timestamp))
 183                 clp->cl_last_renewal = timestamp;
 184         spin_unlock(&clp->cl_lock);
 185 }
 186
 187 static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo)
 188 {
 189         struct nfs_inode *nfsi = NFS_I(inode);
 190
 191         spin_lock(&inode->i_lock);
 192         nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
 193         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 194                 nfsi->change_attr = cinfo->after;
 195         spin_unlock(&inode->i_lock);
 196 }
 197
 198 struct nfs4_opendata {
 199         atomic_t count;
 200         struct nfs_openargs o_arg;
 201         struct nfs_openres o_res;
 202         struct nfs_open_confirmargs c_arg;
 203         struct nfs_open_confirmres c_res;
 204         struct nfs_fattr f_attr;
 205         struct nfs_fattr dir_attr;
 206         struct dentry *dentry;
 207         struct dentry *dir;
 208         struct nfs4_state_owner *owner;
 209         struct iattr attrs;
 210         int rpc_status;
 211         int cancelled;
 212 };
 213
 214 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 215                 struct nfs4_state_owner *sp, int flags,
 216                 const struct iattr *attrs)
 217 {
 218         struct dentry *parent = dget_parent(dentry);
 219         struct inode *dir = parent->d_inode;
 220         struct nfs_server *server = NFS_SERVER(dir);
 221         struct nfs4_opendata *p;
 222
 223         p = kzalloc(sizeof(*p), GFP_KERNEL);
 224         if (p == NULL)
 225                 goto err;
 226         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 227         if (p->o_arg.seqid == NULL)
 228                 goto err_free;
 229         atomic_set(&p->count, 1);
 230         p->dentry = dget(dentry);
 231         p->dir = parent;
 232         p->owner = sp;
 233         atomic_inc(&sp->so_count);
 234         p->o_arg.fh = NFS_FH(dir);
 235         p->o_arg.open_flags = flags,
 236         p->o_arg.clientid = server->nfs4_state->cl_clientid;
 237         p->o_arg.id = sp->so_id;
 238         p->o_arg.name = &dentry->d_name;
 239         p->o_arg.server = server;
 240         p->o_arg.bitmask = server->attr_bitmask;
 241         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 242         p->o_res.f_attr = &p->f_attr;
 243         p->o_res.dir_attr = &p->dir_attr;
 244         p->o_res.server = server;
 245         nfs_fattr_init(&p->f_attr);
 246         nfs_fattr_init(&p->dir_attr);
 247         if (flags & O_EXCL) {
 248                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 249                 s[0] = jiffies;
 250                 s[1] = current->pid;
 251         } else if (flags & O_CREAT) {
 252                 p->o_arg.u.attrs = &p->attrs;
 253                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 254         }
 255         p->c_arg.fh = &p->o_res.fh;
 256         p->c_arg.stateid = &p->o_res.stateid;
 257         p->c_arg.seqid = p->o_arg.seqid;
 258         return p;
 259 err_free:
 260         kfree(p);
 261 err:
 262         dput(parent);
 263         return NULL;
 264 }
 265
 266 static void nfs4_opendata_free(struct nfs4_opendata *p)
 267 {
 268         if (p != NULL && atomic_dec_and_test(&p->count)) {
 269                 nfs_free_seqid(p->o_arg.seqid);
 270                 nfs4_put_state_owner(p->owner);
 271                 dput(p->dir);
 272                 dput(p->dentry);
 273                 kfree(p);
 274         }
 275 }
 276
 277 /* Helper for asynchronous RPC calls */
 278 static int nfs4_call_async(struct rpc_clnt *clnt,
 279                 const struct rpc_call_ops *tk_ops, void *calldata)
 280 {
 281         struct rpc_task *task;
 282
 283         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 284                 return -ENOMEM;
 285         rpc_execute(task);
 286         return 0;
 287 }
 288
 289 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 290 {
 291         sigset_t oldset;
 292         int ret;
 293
 294         rpc_clnt_sigmask(task->tk_client, &oldset);
 295         ret = rpc_wait_for_completion_task(task);
 296         rpc_clnt_sigunmask(task->tk_client, &oldset);
 297         return ret;
 298 }
 299
 300 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 301 {
 302         switch (open_flags) {
 303                 case FMODE_WRITE:
 304                         state->n_wronly++;
 305                         break;
 306                 case FMODE_READ:
 307                         state->n_rdonly++;
 308                         break;
 309                 case FMODE_READ|FMODE_WRITE:
 310                         state->n_rdwr++;
 311         }
 312 }
 313
 314 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 315 {
 316         struct inode *inode = state->inode;
 317
 318         open_flags &= (FMODE_READ|FMODE_WRITE);
 319         /* Protect against nfs4_find_state_byowner() */
 320         spin_lock(&state->owner->so_lock);
 321         spin_lock(&inode->i_lock);
 322         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 323         update_open_stateflags(state, open_flags);
 324         nfs4_state_set_mode_locked(state, state->state | open_flags);
 325         spin_unlock(&inode->i_lock);
 326         spin_unlock(&state->owner->so_lock);
 327 }
 328
 329 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 330 {
 331         struct inode *inode;
 332         struct nfs4_state *state = NULL;
 333
 334         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 335                 goto out;
 336         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 337         if (inode == NULL)
 338                 goto out;
 339         state = nfs4_get_open_state(inode, data->owner);
 340         if (state == NULL)
 341                 goto put_inode;
 342         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 343 put_inode:
 344         iput(inode);
 345 out:
 346         return state;
 347 }
 348
 349 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 350 {
 351         struct nfs_inode *nfsi = NFS_I(state->inode);
 352         struct nfs_open_context *ctx;
 353
 354         spin_lock(&state->inode->i_lock);
 355         list_for_each_entry(ctx, &nfsi->open_files, list) {
 356                 if (ctx->state != state)
 357                         continue;
 358                 get_nfs_open_context(ctx);
 359                 spin_unlock(&state->inode->i_lock);
 360                 return ctx;
 361         }
 362         spin_unlock(&state->inode->i_lock);
 363         return ERR_PTR(-ENOENT);
 364 }
 365
 366 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 367 {
 368         int ret;
 369
 370         opendata->o_arg.open_flags = openflags;
 371         ret = _nfs4_proc_open(opendata);
 372         if (ret != 0)
 373                 return ret;
 374         memcpy(stateid->data, opendata->o_res.stateid.data,
 375                         sizeof(stateid->data));
 376         return 0;
 377 }
 378
 379 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 380 {
 381         nfs4_stateid stateid;
 382         struct nfs4_state *newstate;
 383         int mode = 0;
 384         int delegation = 0;
 385         int ret;
 386
 387         /* memory barrier prior to reading state->n_* */
 388         smp_rmb();
 389         if (state->n_rdwr != 0) {
 390                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 391                 if (ret != 0)
 392                         return ret;
 393                 mode |= FMODE_READ|FMODE_WRITE;
 394                 if (opendata->o_res.delegation_type != 0)
 395                         delegation = opendata->o_res.delegation_type;
 396                 smp_rmb();
 397         }
 398         if (state->n_wronly != 0) {
 399                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 400                 if (ret != 0)
 401                         return ret;
 402                 mode |= FMODE_WRITE;
 403                 if (opendata->o_res.delegation_type != 0)
 404                         delegation = opendata->o_res.delegation_type;
 405                 smp_rmb();
 406         }
 407         if (state->n_rdonly != 0) {
 408                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 409                 if (ret != 0)
 410                         return ret;
 411                 mode |= FMODE_READ;
 412         }
 413         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 414         if (mode == 0)
 415                 return 0;
 416         if (opendata->o_res.delegation_type == 0)
 417                 opendata->o_res.delegation_type = delegation;
 418         opendata->o_arg.open_flags |= mode;
 419         newstate = nfs4_opendata_to_nfs4_state(opendata);
 420         if (newstate != NULL) {
 421                 if (opendata->o_res.delegation_type != 0) {
 422                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 423                         int delegation_flags = 0;
 424                         if (nfsi->delegation)
 425                                 delegation_flags = nfsi->delegation->flags;
 426                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 427                                 nfs_inode_set_delegation(newstate->inode,
 428                                                 opendata->owner->so_cred,
 429                                                 &opendata->o_res);
 430                         else
 431                                 nfs_inode_reclaim_delegation(newstate->inode,
 432                                                 opendata->owner->so_cred,
 433                                                 &opendata->o_res);
 434                 }
 435                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
 436         }
 437         if (newstate != state)
 438                 return -ESTALE;
 439         return 0;
 440 }
 441
 442 /*
 443  * OPEN_RECLAIM:
 444  *      reclaim state on the server after a reboot.
 445  */
 446 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 447 {
 448         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 449         struct nfs4_opendata *opendata;
 450         int delegation_type = 0;
 451         int status;
 452
 453         if (delegation != NULL) {
 454                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 455                         memcpy(&state->stateid, &delegation->stateid,
 456                                         sizeof(state->stateid));
 457                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 458                         return 0;
 459                 }
 460                 delegation_type = delegation->type;
 461         }
 462         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 463         if (opendata == NULL)
 464                 return -ENOMEM;
 465         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 466         opendata->o_arg.fh = NFS_FH(state->inode);
 467         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 468         opendata->o_arg.u.delegation_type = delegation_type;
 469         status = nfs4_open_recover(opendata, state);
 470         nfs4_opendata_free(opendata);
 471         return status;
 472 }
 473
 474 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 475 {
 476         struct nfs_server *server = NFS_SERVER(state->inode);
 477         struct nfs4_exception exception = { };
 478         int err;
 479         do {
 480                 err = _nfs4_do_open_reclaim(sp, state, dentry);
 481                 if (err != -NFS4ERR_DELAY)
 482                         break;
 483                 nfs4_handle_exception(server, err, &exception);
 484         } while (exception.retry);
 485         return err;
 486 }
 487
 488 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 489 {
 490         struct nfs_open_context *ctx;
 491         int ret;
 492
 493         ctx = nfs4_state_find_open_context(state);
 494         if (IS_ERR(ctx))
 495                 return PTR_ERR(ctx);
 496         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
 497         put_nfs_open_context(ctx);
 498         return ret;
 499 }
 500
 501 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 502 {
 503         struct nfs4_state_owner  *sp  = state->owner;
 504         struct nfs4_opendata *opendata;
 505         int ret;
 506
 507         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 508                 return 0;
 509         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 510         if (opendata == NULL)
 511                 return -ENOMEM;
 512         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 513         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 514                         sizeof(opendata->o_arg.u.delegation.data));
 515         ret = nfs4_open_recover(opendata, state);
 516         nfs4_opendata_free(opendata);
 517         return ret;
 518 }
 519
 520 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 521 {
 522         struct nfs4_exception exception = { };
 523         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 524         int err;
 525         do {
 526                 err = _nfs4_open_delegation_recall(dentry, state);
 527                 switch (err) {
 528                         case 0:
 529                                 return err;
 530                         case -NFS4ERR_STALE_CLIENTID:
 531                         case -NFS4ERR_STALE_STATEID:
 532                         case -NFS4ERR_EXPIRED:
 533                                 /* Don't recall a delegation if it was lost */
 534                                 nfs4_schedule_state_recovery(server->nfs4_state);
 535                                 return err;
 536                 }
 537                 err = nfs4_handle_exception(server, err, &exception);
 538         } while (exception.retry);
 539         return err;
 540 }
 541
 542 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 543 {
 544         struct nfs4_opendata *data = calldata;
 545         struct  rpc_message msg = {
 546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 547                 .rpc_argp = &data->c_arg,
 548                 .rpc_resp = &data->c_res,
 549                 .rpc_cred = data->owner->so_cred,
 550         };
 551         rpc_call_setup(task, &msg, 0);
 552 }
 553
 554 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 555 {
 556         struct nfs4_opendata *data = calldata;
 557
 558         data->rpc_status = task->tk_status;
 559         if (RPC_ASSASSINATED(task))
 560                 return;
 561         if (data->rpc_status == 0)
 562                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 563                                 sizeof(data->o_res.stateid.data));
 564         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 565         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 566 }
 567
 568 static void nfs4_open_confirm_release(void *calldata)
 569 {
 570         struct nfs4_opendata *data = calldata;
 571         struct nfs4_state *state = NULL;
 572
 573         /* If this request hasn't been cancelled, do nothing */
 574         if (data->cancelled == 0)
 575                 goto out_free;
 576         /* In case of error, no cleanup! */
 577         if (data->rpc_status != 0)
 578                 goto out_free;
 579         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 580         state = nfs4_opendata_to_nfs4_state(data);
 581         if (state != NULL)
 582                 nfs4_close_state(state, data->o_arg.open_flags);
 583 out_free:
 584         nfs4_opendata_free(data);
 585 }
 586
 587 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 588         .rpc_call_prepare = nfs4_open_confirm_prepare,
 589         .rpc_call_done = nfs4_open_confirm_done,
 590         .rpc_release = nfs4_open_confirm_release,
 591 };
 592
 593 /*
 594  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 595  */
 596 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 597 {
 598         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 599         struct rpc_task *task;
 600         int status;
 601
 602         atomic_inc(&data->count);
 603         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 604         if (IS_ERR(task)) {
 605                 nfs4_opendata_free(data);
 606                 return PTR_ERR(task);
 607         }
 608         status = nfs4_wait_for_completion_rpc_task(task);
 609         if (status != 0) {
 610                 data->cancelled = 1;
 611                 smp_wmb();
 612         } else
 613                 status = data->rpc_status;
 614         rpc_release_task(task);
 615         return status;
 616 }
 617
 618 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 619 {
 620         struct nfs4_opendata *data = calldata;
 621         struct nfs4_state_owner *sp = data->owner;
 622         struct rpc_message msg = {
 623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 624                 .rpc_argp = &data->o_arg,
 625                 .rpc_resp = &data->o_res,
 626                 .rpc_cred = sp->so_cred,
 627         };
 628
 629         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 630                 return;
 631         /* Update sequence id. */
 632         data->o_arg.id = sp->so_id;
 633         data->o_arg.clientid = sp->so_client->cl_clientid;
 634         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 635                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 636         rpc_call_setup(task, &msg, 0);
 637 }
 638
 639 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 640 {
 641         struct nfs4_opendata *data = calldata;
 642
 643         data->rpc_status = task->tk_status;
 644         if (RPC_ASSASSINATED(task))
 645                 return;
 646         if (task->tk_status == 0) {
 647                 switch (data->o_res.f_attr->mode & S_IFMT) {
 648                         case S_IFREG:
 649                                 break;
 650                         case S_IFLNK:
 651                                 data->rpc_status = -ELOOP;
 652                                 break;
 653                         case S_IFDIR:
 654                                 data->rpc_status = -EISDIR;
 655                                 break;
 656                         default:
 657                                 data->rpc_status = -ENOTDIR;
 658                 }
 659         }
 660         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 661 }
 662
 663 static void nfs4_open_release(void *calldata)
 664 {
 665         struct nfs4_opendata *data = calldata;
 666         struct nfs4_state *state = NULL;
 667
 668         /* If this request hasn't been cancelled, do nothing */
 669         if (data->cancelled == 0)
 670                 goto out_free;
 671         /* In case of error, no cleanup! */
 672         if (data->rpc_status != 0)
 673                 goto out_free;
 674         /* In case we need an open_confirm, no cleanup! */
 675         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 676                 goto out_free;
 677         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 678         state = nfs4_opendata_to_nfs4_state(data);
 679         if (state != NULL)
 680                 nfs4_close_state(state, data->o_arg.open_flags);
 681 out_free:
 682         nfs4_opendata_free(data);
 683 }
 684
 685 static const struct rpc_call_ops nfs4_open_ops = {
 686         .rpc_call_prepare = nfs4_open_prepare,
 687         .rpc_call_done = nfs4_open_done,
 688         .rpc_release = nfs4_open_release,
 689 };
 690
 691 /*
 692  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 693  */
 694 static int _nfs4_proc_open(struct nfs4_opendata *data)
 695 {
 696         struct inode *dir = data->dir->d_inode;
 697         struct nfs_server *server = NFS_SERVER(dir);
 698         struct nfs_openargs *o_arg = &data->o_arg;
 699         struct nfs_openres *o_res = &data->o_res;
 700         struct rpc_task *task;
 701         int status;
 702
 703         atomic_inc(&data->count);
 704         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 705         if (IS_ERR(task)) {
 706                 nfs4_opendata_free(data);
 707                 return PTR_ERR(task);
 708         }
 709         status = nfs4_wait_for_completion_rpc_task(task);
 710         if (status != 0) {
 711                 data->cancelled = 1;
 712                 smp_wmb();
 713         } else
 714                 status = data->rpc_status;
 715         rpc_release_task(task);
 716         if (status != 0)
 717                 return status;
 718
 719         if (o_arg->open_flags & O_CREAT) {
 720                 update_changeattr(dir, &o_res->cinfo);
 721                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 722         } else
 723                 nfs_refresh_inode(dir, o_res->dir_attr);
 724         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 725                 status = _nfs4_proc_open_confirm(data);
 726                 if (status != 0)
 727                         return status;
 728         }
 729         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 730         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 731                 return server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 732         return 0;
 733 }
 734
 735 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 736 {
 737         struct nfs_access_entry cache;
 738         int mask = 0;
 739         int status;
 740
 741         if (openflags & FMODE_READ)
 742                 mask |= MAY_READ;
 743         if (openflags & FMODE_WRITE)
 744                 mask |= MAY_WRITE;
 745         status = nfs_access_get_cached(inode, cred, &cache);
 746         if (status == 0)
 747                 goto out;
 748
 749         /* Be clever: ask server to check for all possible rights */
 750         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 751         cache.cred = cred;
 752         cache.jiffies = jiffies;
 753         status = _nfs4_proc_access(inode, &cache);
 754         if (status != 0)
 755                 return status;
 756         nfs_access_add_cache(inode, &cache);
 757 out:
 758         if ((cache.mask & mask) == mask)
 759                 return 0;
 760         return -EACCES;
 761 }
 762
 763 /*
 764  * OPEN_EXPIRED:
 765  *      reclaim state on the server after a network partition.
 766  *      Assumes caller holds the appropriate lock
 767  */
 768 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 769 {
 770         struct inode *inode = state->inode;
 771         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 772         struct nfs4_opendata *opendata;
 773         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 774         int ret;
 775
 776         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 777                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 778                 if (ret < 0)
 779                         return ret;
 780                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 781                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 782                 return 0;
 783         }
 784         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 785         if (opendata == NULL)
 786                 return -ENOMEM;
 787         ret = nfs4_open_recover(opendata, state);
 788         if (ret == -ESTALE) {
 789                 /* Invalidate the state owner so we don't ever use it again */
 790                 nfs4_drop_state_owner(sp);
 791                 d_drop(dentry);
 792         }
 793         nfs4_opendata_free(opendata);
 794         return ret;
 795 }
 796
 797 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 798 {
 799         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 800         struct nfs4_exception exception = { };
 801         int err;
 802
 803         do {
 804                 err = _nfs4_open_expired(sp, state, dentry);
 805                 if (err == -NFS4ERR_DELAY)
 806                         nfs4_handle_exception(server, err, &exception);
 807         } while (exception.retry);
 808         return err;
 809 }
 810
 811 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 812 {
 813         struct nfs_open_context *ctx;
 814         int ret;
 815
 816         ctx = nfs4_state_find_open_context(state);
 817         if (IS_ERR(ctx))
 818                 return PTR_ERR(ctx);
 819         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 820         put_nfs_open_context(ctx);
 821         return ret;
 822 }
 823
 824 /*
 825  * Returns a referenced nfs4_state if there is an open delegation on the file
 826  */
 827 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 828 {
 829         struct nfs_delegation *delegation;
 830         struct nfs_server *server = NFS_SERVER(inode);
 831         struct nfs4_client *clp = server->nfs4_state;
 832         struct nfs_inode *nfsi = NFS_I(inode);
 833         struct nfs4_state_owner *sp = NULL;
 834         struct nfs4_state *state = NULL;
 835         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 836         int err;
 837
 838         /* Protect against reboot recovery - NOTE ORDER! */
 839         down_read(&clp->cl_sem);
 840         /* Protect against delegation recall */
 841         down_read(&nfsi->rwsem);
 842         delegation = NFS_I(inode)->delegation;
 843         err = -ENOENT;
 844         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 845                 goto out_err;
 846         err = -ENOMEM;
 847         if (!(sp = nfs4_get_state_owner(server, cred))) {
 848                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 849                 goto out_err;
 850         }
 851         state = nfs4_get_open_state(inode, sp);
 852         if (state == NULL)
 853                 goto out_err;
 854
 855         err = -ENOENT;
 856         if ((state->state & open_flags) == open_flags) {
 857                 spin_lock(&inode->i_lock);
 858                 update_open_stateflags(state, open_flags);
 859                 spin_unlock(&inode->i_lock);
 860                 goto out_ok;
 861         } else if (state->state != 0)
 862                 goto out_err;
 863
 864         lock_kernel();
 865         err = _nfs4_do_access(inode, cred, open_flags);
 866         unlock_kernel();
 867         if (err != 0)
 868                 goto out_err;
 869         set_bit(NFS_DELEGATED_STATE, &state->flags);
 870         update_open_stateid(state, &delegation->stateid, open_flags);
 871 out_ok:
 872         nfs4_put_state_owner(sp);
 873         up_read(&nfsi->rwsem);
 874         up_read(&clp->cl_sem);
 875         *res = state;
 876         return 0;
 877 out_err:
 878         if (sp != NULL) {
 879                 if (state != NULL)
 880                         nfs4_put_open_state(state);
 881                 nfs4_put_state_owner(sp);
 882         }
 883         up_read(&nfsi->rwsem);
 884         up_read(&clp->cl_sem);
 885         if (err != -EACCES)
 886                 nfs_inode_return_delegation(inode);
 887         return err;
 888 }
 889
 890 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 891 {
 892         struct nfs4_exception exception = { };
 893         struct nfs4_state *res;
 894         int err;
 895
 896         do {
 897                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 898                 if (err == 0)
 899                         break;
 900                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 901                                         err, &exception));
 902         } while (exception.retry);
 903         return res;
 904 }
 905
 906 /*
 907  * Returns a referenced nfs4_state
 908  */
 909 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 910 {
 911         struct nfs4_state_owner  *sp;
 912         struct nfs4_state     *state = NULL;
 913         struct nfs_server       *server = NFS_SERVER(dir);
 914         struct nfs4_client *clp = server->nfs4_state;
 915         struct nfs4_opendata *opendata;
 916         int                     status;
 917
 918         /* Protect against reboot recovery conflicts */
 919         down_read(&clp->cl_sem);
 920         status = -ENOMEM;
 921         if (!(sp = nfs4_get_state_owner(server, cred))) {
 922                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 923                 goto out_err;
 924         }
 925         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 926         if (opendata == NULL)
 927                 goto err_put_state_owner;
 928
 929         status = _nfs4_proc_open(opendata);
 930         if (status != 0)
 931                 goto err_opendata_free;
 932
 933         status = -ENOMEM;
 934         state = nfs4_opendata_to_nfs4_state(opendata);
 935         if (state == NULL)
 936                 goto err_opendata_free;
 937         if (opendata->o_res.delegation_type != 0)
 938                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 939         nfs4_opendata_free(opendata);
 940         nfs4_put_state_owner(sp);
 941         up_read(&clp->cl_sem);
 942         *res = state;
 943         return 0;
 944 err_opendata_free:
 945         nfs4_opendata_free(opendata);
 946 err_put_state_owner:
 947         nfs4_put_state_owner(sp);
 948 out_err:
 949         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 950         up_read(&clp->cl_sem);
 951         *res = NULL;
 952         return status;
 953 }
 954
 955
 956 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
 957 {
 958         struct nfs4_exception exception = { };
 959         struct nfs4_state *res;
 960         int status;
 961
 962         do {
 963                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
 964                 if (status == 0)
 965                         break;
 966                 /* NOTE: BAD_SEQID means the server and client disagree about the
 967                  * book-keeping w.r.t. state-changing operations
 968                  * (OPEN/CLOSE/LOCK/LOCKU...)
 969                  * It is actually a sign of a bug on the client or on the server.
 970                  *
 971                  * If we receive a BAD_SEQID error in the particular case of
 972                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
 973                  * have unhashed the old state_owner for us, and that we can
 974                  * therefore safely retry using a new one. We should still warn
 975                  * the user though...
 976                  */
 977                 if (status == -NFS4ERR_BAD_SEQID) {
 978                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
 979                         exception.retry = 1;
 980                         continue;
 981                 }
 982                 /*
 983                  * BAD_STATEID on OPEN means that the server cancelled our
 984                  * state before it received the OPEN_CONFIRM.
 985                  * Recover by retrying the request as per the discussion
 986                  * on Page 181 of RFC3530.
 987                  */
 988                 if (status == -NFS4ERR_BAD_STATEID) {
 989                         exception.retry = 1;
 990                         continue;
 991                 }
 992                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
 993                                         status, &exception));
 994         } while (exception.retry);
 995         return res;
 996 }
 997
 998 static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
 999                 struct nfs_fh *fhandle, struct iattr *sattr,
1000                 struct nfs4_state *state)
1001 {
1002         struct nfs_setattrargs  arg = {
1003                 .fh             = fhandle,
1004                 .iap            = sattr,
1005                 .server         = server,
1006                 .bitmask = server->attr_bitmask,
1007         };
1008         struct nfs_setattrres  res = {
1009                 .fattr          = fattr,
1010                 .server         = server,
1011         };
1012         struct rpc_message msg = {
1013                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1014                 .rpc_argp       = &arg,
1015                 .rpc_resp       = &res,
1016         };
1017         int status;
1018
1019         nfs_fattr_init(fattr);
1020
1021         if (state != NULL) {
1022                 msg.rpc_cred = state->owner->so_cred;
1023                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1024         } else
1025                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1026
1027         status = rpc_call_sync(server->client, &msg, 0);
1028         return status;
1029 }
1030
1031 static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr,
1032                 struct nfs_fh *fhandle, struct iattr *sattr,
1033                 struct nfs4_state *state)
1034 {
1035         struct nfs4_exception exception = { };
1036         int err;
1037         do {
1038                 err = nfs4_handle_exception(server,
1039                                 _nfs4_do_setattr(server, fattr, fhandle, sattr,
1040                                         state),
1041                                 &exception);
1042         } while (exception.retry);
1043         return err;
1044 }
1045
1046 struct nfs4_closedata {
1047         struct inode *inode;
1048         struct nfs4_state *state;
1049         struct nfs_closeargs arg;
1050         struct nfs_closeres res;
1051         struct nfs_fattr fattr;
1052 };
1053
1054 static void nfs4_free_closedata(void *data)
1055 {
1056         struct nfs4_closedata *calldata = data;
1057         struct nfs4_state_owner *sp = calldata->state->owner;
1058
1059         nfs4_put_open_state(calldata->state);
1060         nfs_free_seqid(calldata->arg.seqid);
1061         nfs4_put_state_owner(sp);
1062         kfree(calldata);
1063 }
1064
1065 static void nfs4_close_done(struct rpc_task *task, void *data)
1066 {
1067         struct nfs4_closedata *calldata = data;
1068         struct nfs4_state *state = calldata->state;
1069         struct nfs_server *server = NFS_SERVER(calldata->inode);
1070
1071         if (RPC_ASSASSINATED(task))
1072                 return;
1073         /* hmm. we are done with the inode, and in the process of freeing
1074          * the state_owner. we keep this around to process errors
1075          */
1076         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1077         switch (task->tk_status) {
1078                 case 0:
1079                         memcpy(&state->stateid, &calldata->res.stateid,
1080                                         sizeof(state->stateid));
1081                         break;
1082                 case -NFS4ERR_STALE_STATEID:
1083                 case -NFS4ERR_EXPIRED:
1084                         nfs4_schedule_state_recovery(server->nfs4_state);
1085                         break;
1086                 default:
1087                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1088                                 rpc_restart_call(task);
1089                                 return;
1090                         }
1091         }
1092         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1093 }
1094
1095 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1096 {
1097         struct nfs4_closedata *calldata = data;
1098         struct nfs4_state *state = calldata->state;
1099         struct rpc_message msg = {
1100                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1101                 .rpc_argp = &calldata->arg,
1102                 .rpc_resp = &calldata->res,
1103                 .rpc_cred = state->owner->so_cred,
1104         };
1105         int mode = 0, old_mode;
1106
1107         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1108                 return;
1109         /* Recalculate the new open mode in case someone reopened the file
1110          * while we were waiting in line to be scheduled.
1111          */
1112         spin_lock(&state->owner->so_lock);
1113         spin_lock(&calldata->inode->i_lock);
1114         mode = old_mode = state->state;
1115         if (state->n_rdwr == 0) {
1116                 if (state->n_rdonly == 0)
1117                         mode &= ~FMODE_READ;
1118                 if (state->n_wronly == 0)
1119                         mode &= ~FMODE_WRITE;
1120         }
1121         nfs4_state_set_mode_locked(state, mode);
1122         spin_unlock(&calldata->inode->i_lock);
1123         spin_unlock(&state->owner->so_lock);
1124         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1125                 /* Note: exit _without_ calling nfs4_close_done */
1126                 task->tk_action = NULL;
1127                 return;
1128         }
1129         nfs_fattr_init(calldata->res.fattr);
1130         if (mode != 0)
1131                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1132         calldata->arg.open_flags = mode;
1133         rpc_call_setup(task, &msg, 0);
1134 }
1135
1136 static const struct rpc_call_ops nfs4_close_ops = {
1137         .rpc_call_prepare = nfs4_close_prepare,
1138         .rpc_call_done = nfs4_close_done,
1139         .rpc_release = nfs4_free_closedata,
1140 };
1141
1142 /*
1143  * It is possible for data to be read/written from a mem-mapped file
1144  * after the sys_close call (which hits the vfs layer as a flush).
1145  * This means that we can't safely call nfsv4 close on a file until
1146  * the inode is cleared. This in turn means that we are not good
1147  * NFSv4 citizens - we do not indicate to the server to update the file's
1148  * share state even when we are done with one of the three share
1149  * stateid's in the inode.
1150  *
1151  * NOTE: Caller must be holding the sp->so_owner semaphore!
1152  */
1153 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1154 {
1155         struct nfs_server *server = NFS_SERVER(inode);
1156         struct nfs4_closedata *calldata;
1157         int status = -ENOMEM;
1158
1159         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1160         if (calldata == NULL)
1161                 goto out;
1162         calldata->inode = inode;
1163         calldata->state = state;
1164         calldata->arg.fh = NFS_FH(inode);
1165         calldata->arg.stateid = &state->stateid;
1166         /* Serialization for the sequence id */
1167         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1168         if (calldata->arg.seqid == NULL)
1169                 goto out_free_calldata;
1170         calldata->arg.bitmask = server->attr_bitmask;
1171         calldata->res.fattr = &calldata->fattr;
1172         calldata->res.server = server;
1173
1174         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1175         if (status == 0)
1176                 goto out;
1177
1178         nfs_free_seqid(calldata->arg.seqid);
1179 out_free_calldata:
1180         kfree(calldata);
1181 out:
1182         return status;
1183 }
1184
1185 static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1186 {
1187         struct file *filp;
1188
1189         filp = lookup_instantiate_filp(nd, dentry, NULL);
1190         if (!IS_ERR(filp)) {
1191                 struct nfs_open_context *ctx;
1192                 ctx = (struct nfs_open_context *)filp->private_data;
1193                 ctx->state = state;
1194         } else
1195                 nfs4_close_state(state, nd->intent.open.flags);
1196 }
1197
1198 struct dentry *
1199 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1200 {
1201         struct iattr attr;
1202         struct rpc_cred *cred;
1203         struct nfs4_state *state;
1204         struct dentry *res;
1205
1206         if (nd->flags & LOOKUP_CREATE) {
1207                 attr.ia_mode = nd->intent.open.create_mode;
1208                 attr.ia_valid = ATTR_MODE;
1209                 if (!IS_POSIXACL(dir))
1210                         attr.ia_mode &= ~current->fs->umask;
1211         } else {
1212                 attr.ia_valid = 0;
1213                 BUG_ON(nd->intent.open.flags & O_CREAT);
1214         }
1215
1216         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1217         if (IS_ERR(cred))
1218                 return (struct dentry *)cred;
1219         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1220         put_rpccred(cred);
1221         if (IS_ERR(state)) {
1222                 if (PTR_ERR(state) == -ENOENT)
1223                         d_add(dentry, NULL);
1224                 return (struct dentry *)state;
1225         }
1226         res = d_add_unique(dentry, igrab(state->inode));
1227         if (res != NULL)
1228                 dentry = res;
1229         nfs4_intent_set_file(nd, dentry, state);
1230         return res;
1231 }
1232
1233 int
1234 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1235 {
1236         struct rpc_cred *cred;
1237         struct nfs4_state *state;
1238
1239         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1240         if (IS_ERR(cred))
1241                 return PTR_ERR(cred);
1242         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1243         if (IS_ERR(state))
1244                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1245         put_rpccred(cred);
1246         if (IS_ERR(state)) {
1247                 switch (PTR_ERR(state)) {
1248                         case -EPERM:
1249                         case -EACCES:
1250                         case -EDQUOT:
1251                         case -ENOSPC:
1252                         case -EROFS:
1253                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1254                                 return 1;
1255                         case -ENOENT:
1256                                 if (dentry->d_inode == NULL)
1257                                         return 1;
1258                 }
1259                 goto out_drop;
1260         }
1261         if (state->inode == dentry->d_inode) {
1262                 nfs4_intent_set_file(nd, dentry, state);
1263                 return 1;
1264         }
1265         nfs4_close_state(state, openflags);
1266 out_drop:
1267         d_drop(dentry);
1268         return 0;
1269 }
1270
1271
1272 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1273 {
1274         struct nfs4_server_caps_res res = {};
1275         struct rpc_message msg = {
1276                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1277                 .rpc_argp = fhandle,
1278                 .rpc_resp = &res,
1279         };
1280         int status;
1281
1282         status = rpc_call_sync(server->client, &msg, 0);
1283         if (status == 0) {
1284                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1285                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1286                         server->caps |= NFS_CAP_ACLS;
1287                 if (res.has_links != 0)
1288                         server->caps |= NFS_CAP_HARDLINKS;
1289                 if (res.has_symlinks != 0)
1290                         server->caps |= NFS_CAP_SYMLINKS;
1291                 server->acl_bitmask = res.acl_bitmask;
1292         }
1293         return status;
1294 }
1295
1296 static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1297 {
1298         struct nfs4_exception exception = { };
1299         int err;
1300         do {
1301                 err = nfs4_handle_exception(server,
1302                                 _nfs4_server_capabilities(server, fhandle),
1303                                 &exception);
1304         } while (exception.retry);
1305         return err;
1306 }
1307
1308 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1309                 struct nfs_fsinfo *info)
1310 {
1311         struct nfs4_lookup_root_arg args = {
1312                 .bitmask = nfs4_fattr_bitmap,
1313         };
1314         struct nfs4_lookup_res res = {
1315                 .server = server,
1316                 .fattr = info->fattr,
1317                 .fh = fhandle,
1318         };
1319         struct rpc_message msg = {
1320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1321                 .rpc_argp = &args,
1322                 .rpc_resp = &res,
1323         };
1324         nfs_fattr_init(info->fattr);
1325         return rpc_call_sync(server->client, &msg, 0);
1326 }
1327
1328 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1329                 struct nfs_fsinfo *info)
1330 {
1331         struct nfs4_exception exception = { };
1332         int err;
1333         do {
1334                 err = nfs4_handle_exception(server,
1335                                 _nfs4_lookup_root(server, fhandle, info),
1336                                 &exception);
1337         } while (exception.retry);
1338         return err;
1339 }
1340
1341 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1342                 struct nfs_fsinfo *info)
1343 {
1344         struct nfs_fattr *      fattr = info->fattr;
1345         unsigned char *         p;
1346         struct qstr             q;
1347         struct nfs4_lookup_arg args = {
1348                 .dir_fh = fhandle,
1349                 .name = &q,
1350                 .bitmask = nfs4_fattr_bitmap,
1351         };
1352         struct nfs4_lookup_res res = {
1353                 .server = server,
1354                 .fattr = fattr,
1355                 .fh = fhandle,
1356         };
1357         struct rpc_message msg = {
1358                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1359                 .rpc_argp = &args,
1360                 .rpc_resp = &res,
1361         };
1362         int status;
1363
1364         /*
1365          * Now we do a separate LOOKUP for each component of the mount path.
1366          * The LOOKUPs are done separately so that we can conveniently
1367          * catch an ERR_WRONGSEC if it occurs along the way...
1368          */
1369         status = nfs4_lookup_root(server, fhandle, info);
1370         if (status)
1371                 goto out;
1372
1373         p = server->mnt_path;
1374         for (;;) {
1375                 struct nfs4_exception exception = { };
1376
1377                 while (*p == '/')
1378                         p++;
1379                 if (!*p)
1380                         break;
1381                 q.name = p;
1382                 while (*p && (*p != '/'))
1383                         p++;
1384                 q.len = p - q.name;
1385
1386                 do {
1387                         nfs_fattr_init(fattr);
1388                         status = nfs4_handle_exception(server,
1389                                         rpc_call_sync(server->client, &msg, 0),
1390                                         &exception);
1391                 } while (exception.retry);
1392                 if (status == 0)
1393                         continue;
1394                 if (status == -ENOENT) {
1395                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1396                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1397                 }
1398                 break;
1399         }
1400         if (status == 0)
1401                 status = nfs4_server_capabilities(server, fhandle);
1402         if (status == 0)
1403                 status = nfs4_do_fsinfo(server, fhandle, info);
1404 out:
1405         return status;
1406 }
1407
1408 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1409 {
1410         struct nfs4_getattr_arg args = {
1411                 .fh = fhandle,
1412                 .bitmask = server->attr_bitmask,
1413         };
1414         struct nfs4_getattr_res res = {
1415                 .fattr = fattr,
1416                 .server = server,
1417         };
1418         struct rpc_message msg = {
1419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1420                 .rpc_argp = &args,
1421                 .rpc_resp = &res,
1422         };
1423
1424         nfs_fattr_init(fattr);
1425         return rpc_call_sync(server->client, &msg, 0);
1426 }
1427
1428 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1429 {
1430         struct nfs4_exception exception = { };
1431         int err;
1432         do {
1433                 err = nfs4_handle_exception(server,
1434                                 _nfs4_proc_getattr(server, fhandle, fattr),
1435                                 &exception);
1436         } while (exception.retry);
1437         return err;
1438 }
1439
1440 /*
1441  * The file is not closed if it is opened due to the a request to change
1442  * the size of the file. The open call will not be needed once the
1443  * VFS layer lookup-intents are implemented.
1444  *
1445  * Close is called when the inode is destroyed.
1446  * If we haven't opened the file for O_WRONLY, we
1447  * need to in the size_change case to obtain a stateid.
1448  *
1449  * Got race?
1450  * Because OPEN is always done by name in nfsv4, it is
1451  * possible that we opened a different file by the same
1452  * name.  We can recognize this race condition, but we
1453  * can't do anything about it besides returning an error.
1454  *
1455  * This will be fixed with VFS changes (lookup-intent).
1456  */
1457 static int
1458 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1459                   struct iattr *sattr)
1460 {
1461         struct rpc_cred *cred;
1462         struct inode *inode = dentry->d_inode;
1463         struct nfs_open_context *ctx;
1464         struct nfs4_state *state = NULL;
1465         int status;
1466
1467         nfs_fattr_init(fattr);
1468
1469         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1470         if (IS_ERR(cred))
1471                 return PTR_ERR(cred);
1472
1473         /* Search for an existing open(O_WRITE) file */
1474         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1475         if (ctx != NULL)
1476                 state = ctx->state;
1477
1478         status = nfs4_do_setattr(NFS_SERVER(inode), fattr,
1479                         NFS_FH(inode), sattr, state);
1480         if (status == 0)
1481                 nfs_setattr_update_inode(inode, sattr);
1482         if (ctx != NULL)
1483                 put_nfs_open_context(ctx);
1484         put_rpccred(cred);
1485         return status;
1486 }
1487
1488 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1489                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1490 {
1491         int                    status;
1492         struct nfs_server *server = NFS_SERVER(dir);
1493         struct nfs4_lookup_arg args = {
1494                 .bitmask = server->attr_bitmask,
1495                 .dir_fh = NFS_FH(dir),
1496                 .name = name,
1497         };
1498         struct nfs4_lookup_res res = {
1499                 .server = server,
1500                 .fattr = fattr,
1501                 .fh = fhandle,
1502         };
1503         struct rpc_message msg = {
1504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1505                 .rpc_argp = &args,
1506                 .rpc_resp = &res,
1507         };
1508
1509         nfs_fattr_init(fattr);
1510
1511         dprintk("NFS call  lookup %s\n", name->name);
1512         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1513         dprintk("NFS reply lookup: %d\n", status);
1514         return status;
1515 }
1516
1517 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1518 {
1519         struct nfs4_exception exception = { };
1520         int err;
1521         do {
1522                 err = nfs4_handle_exception(NFS_SERVER(dir),
1523                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1524                                 &exception);
1525         } while (exception.retry);
1526         return err;
1527 }
1528
1529 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1530 {
1531         struct nfs4_accessargs args = {
1532                 .fh = NFS_FH(inode),
1533         };
1534         struct nfs4_accessres res = { 0 };
1535         struct rpc_message msg = {
1536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1537                 .rpc_argp = &args,
1538                 .rpc_resp = &res,
1539                 .rpc_cred = entry->cred,
1540         };
1541         int mode = entry->mask;
1542         int status;
1543
1544         /*
1545          * Determine which access bits we want to ask for...
1546          */
1547         if (mode & MAY_READ)
1548                 args.access |= NFS4_ACCESS_READ;
1549         if (S_ISDIR(inode->i_mode)) {
1550                 if (mode & MAY_WRITE)
1551                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1552                 if (mode & MAY_EXEC)
1553                         args.access |= NFS4_ACCESS_LOOKUP;
1554         } else {
1555                 if (mode & MAY_WRITE)
1556                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1557                 if (mode & MAY_EXEC)
1558                         args.access |= NFS4_ACCESS_EXECUTE;
1559         }
1560         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1561         if (!status) {
1562                 entry->mask = 0;
1563                 if (res.access & NFS4_ACCESS_READ)
1564                         entry->mask |= MAY_READ;
1565                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1566                         entry->mask |= MAY_WRITE;
1567                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1568                         entry->mask |= MAY_EXEC;
1569         }
1570         return status;
1571 }
1572
1573 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1574 {
1575         struct nfs4_exception exception = { };
1576         int err;
1577         do {
1578                 err = nfs4_handle_exception(NFS_SERVER(inode),
1579                                 _nfs4_proc_access(inode, entry),
1580                                 &exception);
1581         } while (exception.retry);
1582         return err;
1583 }
1584
1585 /*
1586  * TODO: For the time being, we don't try to get any attributes
1587  * along with any of the zero-copy operations READ, READDIR,
1588  * READLINK, WRITE.
1589  *
1590  * In the case of the first three, we want to put the GETATTR
1591  * after the read-type operation -- this is because it is hard
1592  * to predict the length of a GETATTR response in v4, and thus
1593  * align the READ data correctly.  This means that the GETATTR
1594  * may end up partially falling into the page cache, and we should
1595  * shift it into the 'tail' of the xdr_buf before processing.
1596  * To do this efficiently, we need to know the total length
1597  * of data received, which doesn't seem to be available outside
1598  * of the RPC layer.
1599  *
1600  * In the case of WRITE, we also want to put the GETATTR after
1601  * the operation -- in this case because we want to make sure
1602  * we get the post-operation mtime and size.  This means that
1603  * we can't use xdr_encode_pages() as written: we need a variant
1604  * of it which would leave room in the 'tail' iovec.
1605  *
1606  * Both of these changes to the XDR layer would in fact be quite
1607  * minor, but I decided to leave them for a subsequent patch.
1608  */
1609 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1610                 unsigned int pgbase, unsigned int pglen)
1611 {
1612         struct nfs4_readlink args = {
1613                 .fh       = NFS_FH(inode),
1614                 .pgbase   = pgbase,
1615                 .pglen    = pglen,
1616                 .pages    = &page,
1617         };
1618         struct rpc_message msg = {
1619                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1620                 .rpc_argp = &args,
1621                 .rpc_resp = NULL,
1622         };
1623
1624         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1625 }
1626
1627 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1628                 unsigned int pgbase, unsigned int pglen)
1629 {
1630         struct nfs4_exception exception = { };
1631         int err;
1632         do {
1633                 err = nfs4_handle_exception(NFS_SERVER(inode),
1634                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1635                                 &exception);
1636         } while (exception.retry);
1637         return err;
1638 }
1639
1640 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1641 {
1642         int flags = rdata->flags;
1643         struct inode *inode = rdata->inode;
1644         struct nfs_fattr *fattr = rdata->res.fattr;
1645         struct nfs_server *server = NFS_SERVER(inode);
1646         struct rpc_message msg = {
1647                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1648                 .rpc_argp       = &rdata->args,
1649                 .rpc_resp       = &rdata->res,
1650                 .rpc_cred       = rdata->cred,
1651         };
1652         unsigned long timestamp = jiffies;
1653         int status;
1654
1655         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1656                         (long long) rdata->args.offset);
1657
1658         nfs_fattr_init(fattr);
1659         status = rpc_call_sync(server->client, &msg, flags);
1660         if (!status)
1661                 renew_lease(server, timestamp);
1662         dprintk("NFS reply read: %d\n", status);
1663         return status;
1664 }
1665
1666 static int nfs4_proc_read(struct nfs_read_data *rdata)
1667 {
1668         struct nfs4_exception exception = { };
1669         int err;
1670         do {
1671                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1672                                 _nfs4_proc_read(rdata),
1673                                 &exception);
1674         } while (exception.retry);
1675         return err;
1676 }
1677
1678 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1679 {
1680         int rpcflags = wdata->flags;
1681         struct inode *inode = wdata->inode;
1682         struct nfs_fattr *fattr = wdata->res.fattr;
1683         struct nfs_server *server = NFS_SERVER(inode);
1684         struct rpc_message msg = {
1685                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1686                 .rpc_argp       = &wdata->args,
1687                 .rpc_resp       = &wdata->res,
1688                 .rpc_cred       = wdata->cred,
1689         };
1690         int status;
1691
1692         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1693                         (long long) wdata->args.offset);
1694
1695         wdata->args.bitmask = server->attr_bitmask;
1696         wdata->res.server = server;
1697         nfs_fattr_init(fattr);
1698         status = rpc_call_sync(server->client, &msg, rpcflags);
1699         dprintk("NFS reply write: %d\n", status);
1700         if (status < 0)
1701                 return status;
1702         nfs_post_op_update_inode(inode, fattr);
1703         return wdata->res.count;
1704 }
1705
1706 static int nfs4_proc_write(struct nfs_write_data *wdata)
1707 {
1708         struct nfs4_exception exception = { };
1709         int err;
1710         do {
1711                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1712                                 _nfs4_proc_write(wdata),
1713                                 &exception);
1714         } while (exception.retry);
1715         return err;
1716 }
1717
1718 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1719 {
1720         struct inode *inode = cdata->inode;
1721         struct nfs_fattr *fattr = cdata->res.fattr;
1722         struct nfs_server *server = NFS_SERVER(inode);
1723         struct rpc_message msg = {
1724                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1725                 .rpc_argp       = &cdata->args,
1726                 .rpc_resp       = &cdata->res,
1727                 .rpc_cred       = cdata->cred,
1728         };
1729         int status;
1730
1731         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1732                         (long long) cdata->args.offset);
1733
1734         cdata->args.bitmask = server->attr_bitmask;
1735         cdata->res.server = server;
1736         nfs_fattr_init(fattr);
1737         status = rpc_call_sync(server->client, &msg, 0);
1738         dprintk("NFS reply commit: %d\n", status);
1739         if (status >= 0)
1740                 nfs_post_op_update_inode(inode, fattr);
1741         return status;
1742 }
1743
1744 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1745 {
1746         struct nfs4_exception exception = { };
1747         int err;
1748         do {
1749                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1750                                 _nfs4_proc_commit(cdata),
1751                                 &exception);
1752         } while (exception.retry);
1753         return err;
1754 }
1755
1756 /*
1757  * Got race?
1758  * We will need to arrange for the VFS layer to provide an atomic open.
1759  * Until then, this create/open method is prone to inefficiency and race
1760  * conditions due to the lookup, create, and open VFS calls from sys_open()
1761  * placed on the wire.
1762  *
1763  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1764  * The file will be opened again in the subsequent VFS open call
1765  * (nfs4_proc_file_open).
1766  *
1767  * The open for read will just hang around to be used by any process that
1768  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1769  */
1770
1771 static int
1772 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1773                  int flags, struct nameidata *nd)
1774 {
1775         struct nfs4_state *state;
1776         struct rpc_cred *cred;
1777         int status = 0;
1778
1779         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1780         if (IS_ERR(cred)) {
1781                 status = PTR_ERR(cred);
1782                 goto out;
1783         }
1784         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1785         put_rpccred(cred);
1786         if (IS_ERR(state)) {
1787                 status = PTR_ERR(state);
1788                 goto out;
1789         }
1790         d_instantiate(dentry, igrab(state->inode));
1791         if (flags & O_EXCL) {
1792                 struct nfs_fattr fattr;
1793                 status = nfs4_do_setattr(NFS_SERVER(dir), &fattr,
1794                                      NFS_FH(state->inode), sattr, state);
1795                 if (status == 0)
1796                         nfs_setattr_update_inode(state->inode, sattr);
1797         }
1798         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1799                 nfs4_intent_set_file(nd, dentry, state);
1800         else
1801                 nfs4_close_state(state, flags);
1802 out:
1803         return status;
1804 }
1805
1806 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1807 {
1808         struct nfs_server *server = NFS_SERVER(dir);
1809         struct nfs4_remove_arg args = {
1810                 .fh = NFS_FH(dir),
1811                 .name = name,
1812                 .bitmask = server->attr_bitmask,
1813         };
1814         struct nfs_fattr dir_attr;
1815         struct nfs4_remove_res  res = {
1816                 .server = server,
1817                 .dir_attr = &dir_attr,
1818         };
1819         struct rpc_message msg = {
1820                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1821                 .rpc_argp       = &args,
1822                 .rpc_resp       = &res,
1823         };
1824         int                     status;
1825
1826         nfs_fattr_init(res.dir_attr);
1827         status = rpc_call_sync(server->client, &msg, 0);
1828         if (status == 0) {
1829                 update_changeattr(dir, &res.cinfo);
1830                 nfs_post_op_update_inode(dir, res.dir_attr);
1831         }
1832         return status;
1833 }
1834
1835 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1836 {
1837         struct nfs4_exception exception = { };
1838         int err;
1839         do {
1840                 err = nfs4_handle_exception(NFS_SERVER(dir),
1841                                 _nfs4_proc_remove(dir, name),
1842                                 &exception);
1843         } while (exception.retry);
1844         return err;
1845 }
1846
1847 struct unlink_desc {
1848         struct nfs4_remove_arg  args;
1849         struct nfs4_remove_res  res;
1850         struct nfs_fattr dir_attr;
1851 };
1852
1853 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1854                 struct qstr *name)
1855 {
1856         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1857         struct unlink_desc *up;
1858
1859         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1860         if (!up)
1861                 return -ENOMEM;
1862
1863         up->args.fh = NFS_FH(dir->d_inode);
1864         up->args.name = name;
1865         up->args.bitmask = server->attr_bitmask;
1866         up->res.server = server;
1867         up->res.dir_attr = &up->dir_attr;
1868
1869         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1870         msg->rpc_argp = &up->args;
1871         msg->rpc_resp = &up->res;
1872         return 0;
1873 }
1874
1875 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1876 {
1877         struct rpc_message *msg = &task->tk_msg;
1878         struct unlink_desc *up;
1879
1880         if (msg->rpc_resp != NULL) {
1881                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1882                 update_changeattr(dir->d_inode, &up->res.cinfo);
1883                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1884                 kfree(up);
1885                 msg->rpc_resp = NULL;
1886                 msg->rpc_argp = NULL;
1887         }
1888         return 0;
1889 }
1890
1891 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1892                 struct inode *new_dir, struct qstr *new_name)
1893 {
1894         struct nfs_server *server = NFS_SERVER(old_dir);
1895         struct nfs4_rename_arg arg = {
1896                 .old_dir = NFS_FH(old_dir),
1897                 .new_dir = NFS_FH(new_dir),
1898                 .old_name = old_name,
1899                 .new_name = new_name,
1900                 .bitmask = server->attr_bitmask,
1901         };
1902         struct nfs_fattr old_fattr, new_fattr;
1903         struct nfs4_rename_res res = {
1904                 .server = server,
1905                 .old_fattr = &old_fattr,
1906                 .new_fattr = &new_fattr,
1907         };
1908         struct rpc_message msg = {
1909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1910                 .rpc_argp = &arg,
1911                 .rpc_resp = &res,
1912         };
1913         int                     status;
1914
1915         nfs_fattr_init(res.old_fattr);
1916         nfs_fattr_init(res.new_fattr);
1917         status = rpc_call_sync(server->client, &msg, 0);
1918
1919         if (!status) {
1920                 update_changeattr(old_dir, &res.old_cinfo);
1921                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1922                 update_changeattr(new_dir, &res.new_cinfo);
1923                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1924         }
1925         return status;
1926 }
1927
1928 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1929                 struct inode *new_dir, struct qstr *new_name)
1930 {
1931         struct nfs4_exception exception = { };
1932         int err;
1933         do {
1934                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1935                                 _nfs4_proc_rename(old_dir, old_name,
1936                                         new_dir, new_name),
1937                                 &exception);
1938         } while (exception.retry);
1939         return err;
1940 }
1941
1942 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1943 {
1944         struct nfs_server *server = NFS_SERVER(inode);
1945         struct nfs4_link_arg arg = {
1946                 .fh     = NFS_FH(inode),
1947                 .dir_fh = NFS_FH(dir),
1948                 .name   = name,
1949                 .bitmask = server->attr_bitmask,
1950         };
1951         struct nfs_fattr fattr, dir_attr;
1952         struct nfs4_link_res res = {
1953                 .server = server,
1954                 .fattr = &fattr,
1955                 .dir_attr = &dir_attr,
1956         };
1957         struct rpc_message msg = {
1958                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
1959                 .rpc_argp = &arg,
1960                 .rpc_resp = &res,
1961         };
1962         int                     status;
1963
1964         nfs_fattr_init(res.fattr);
1965         nfs_fattr_init(res.dir_attr);
1966         status = rpc_call_sync(server->client, &msg, 0);
1967         if (!status) {
1968                 update_changeattr(dir, &res.cinfo);
1969                 nfs_post_op_update_inode(dir, res.dir_attr);
1970                 nfs_refresh_inode(inode, res.fattr);
1971         }
1972
1973         return status;
1974 }
1975
1976 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
1977 {
1978         struct nfs4_exception exception = { };
1979         int err;
1980         do {
1981                 err = nfs4_handle_exception(NFS_SERVER(inode),
1982                                 _nfs4_proc_link(inode, dir, name),
1983                                 &exception);
1984         } while (exception.retry);
1985         return err;
1986 }
1987
1988 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
1989                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
1990                 struct nfs_fattr *fattr)
1991 {
1992         struct nfs_server *server = NFS_SERVER(dir);
1993         struct nfs_fattr dir_fattr;
1994         struct nfs4_create_arg arg = {
1995                 .dir_fh = NFS_FH(dir),
1996                 .server = server,
1997                 .name = name,
1998                 .attrs = sattr,
1999                 .ftype = NF4LNK,
2000                 .bitmask = server->attr_bitmask,
2001         };
2002         struct nfs4_create_res res = {
2003                 .server = server,
2004                 .fh = fhandle,
2005                 .fattr = fattr,
2006                 .dir_fattr = &dir_fattr,
2007         };
2008         struct rpc_message msg = {
2009                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2010                 .rpc_argp = &arg,
2011                 .rpc_resp = &res,
2012         };
2013         int                     status;
2014
2015         if (path->len > NFS4_MAXPATHLEN)
2016                 return -ENAMETOOLONG;
2017         arg.u.symlink = path;
2018         nfs_fattr_init(fattr);
2019         nfs_fattr_init(&dir_fattr);
2020
2021         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2022         if (!status)
2023                 update_changeattr(dir, &res.dir_cinfo);
2024         nfs_post_op_update_inode(dir, res.dir_fattr);
2025         return status;
2026 }
2027
2028 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2029                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2030                 struct nfs_fattr *fattr)
2031 {
2032         struct nfs4_exception exception = { };
2033         int err;
2034         do {
2035                 err = nfs4_handle_exception(NFS_SERVER(dir),
2036                                 _nfs4_proc_symlink(dir, name, path, sattr,
2037                                         fhandle, fattr),
2038                                 &exception);
2039         } while (exception.retry);
2040         return err;
2041 }
2042
2043 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2044                 struct iattr *sattr)
2045 {
2046         struct nfs_server *server = NFS_SERVER(dir);
2047         struct nfs_fh fhandle;
2048         struct nfs_fattr fattr, dir_fattr;
2049         struct nfs4_create_arg arg = {
2050                 .dir_fh = NFS_FH(dir),
2051                 .server = server,
2052                 .name = &dentry->d_name,
2053                 .attrs = sattr,
2054                 .ftype = NF4DIR,
2055                 .bitmask = server->attr_bitmask,
2056         };
2057         struct nfs4_create_res res = {
2058                 .server = server,
2059                 .fh = &fhandle,
2060                 .fattr = &fattr,
2061                 .dir_fattr = &dir_fattr,
2062         };
2063         struct rpc_message msg = {
2064                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2065                 .rpc_argp = &arg,
2066                 .rpc_resp = &res,
2067         };
2068         int                     status;
2069
2070         nfs_fattr_init(&fattr);
2071         nfs_fattr_init(&dir_fattr);
2072
2073         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2074         if (!status) {
2075                 update_changeattr(dir, &res.dir_cinfo);
2076                 nfs_post_op_update_inode(dir, res.dir_fattr);
2077                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2078         }
2079         return status;
2080 }
2081
2082 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2083                 struct iattr *sattr)
2084 {
2085         struct nfs4_exception exception = { };
2086         int err;
2087         do {
2088                 err = nfs4_handle_exception(NFS_SERVER(dir),
2089                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2090                                 &exception);
2091         } while (exception.retry);
2092         return err;
2093 }
2094
2095 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2096                   u64 cookie, struct page *page, unsigned int count, int plus)
2097 {
2098         struct inode            *dir = dentry->d_inode;
2099         struct nfs4_readdir_arg args = {
2100                 .fh = NFS_FH(dir),
2101                 .pages = &page,
2102                 .pgbase = 0,
2103                 .count = count,
2104                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2105         };
2106         struct nfs4_readdir_res res;
2107         struct rpc_message msg = {
2108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2109                 .rpc_argp = &args,
2110                 .rpc_resp = &res,
2111                 .rpc_cred = cred,
2112         };
2113         int                     status;
2114
2115         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2116                         dentry->d_parent->d_name.name,
2117                         dentry->d_name.name,
2118                         (unsigned long long)cookie);
2119         lock_kernel();
2120         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2121         res.pgbase = args.pgbase;
2122         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2123         if (status == 0)
2124                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2125         unlock_kernel();
2126         dprintk("%s: returns %d\n", __FUNCTION__, status);
2127         return status;
2128 }
2129
2130 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2131                   u64 cookie, struct page *page, unsigned int count, int plus)
2132 {
2133         struct nfs4_exception exception = { };
2134         int err;
2135         do {
2136                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2137                                 _nfs4_proc_readdir(dentry, cred, cookie,
2138                                         page, count, plus),
2139                                 &exception);
2140         } while (exception.retry);
2141         return err;
2142 }
2143
2144 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2145                 struct iattr *sattr, dev_t rdev)
2146 {
2147         struct nfs_server *server = NFS_SERVER(dir);
2148         struct nfs_fh fh;
2149         struct nfs_fattr fattr, dir_fattr;
2150         struct nfs4_create_arg arg = {
2151                 .dir_fh = NFS_FH(dir),
2152                 .server = server,
2153                 .name = &dentry->d_name,
2154                 .attrs = sattr,
2155                 .bitmask = server->attr_bitmask,
2156         };
2157         struct nfs4_create_res res = {
2158                 .server = server,
2159                 .fh = &fh,
2160                 .fattr = &fattr,
2161                 .dir_fattr = &dir_fattr,
2162         };
2163         struct rpc_message msg = {
2164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2165                 .rpc_argp = &arg,
2166                 .rpc_resp = &res,
2167         };
2168         int                     status;
2169         int                     mode = sattr->ia_mode;
2170
2171         nfs_fattr_init(&fattr);
2172         nfs_fattr_init(&dir_fattr);
2173
2174         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2175         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2176         if (S_ISFIFO(mode))
2177                 arg.ftype = NF4FIFO;
2178         else if (S_ISBLK(mode)) {
2179                 arg.ftype = NF4BLK;
2180                 arg.u.device.specdata1 = MAJOR(rdev);
2181                 arg.u.device.specdata2 = MINOR(rdev);
2182         }
2183         else if (S_ISCHR(mode)) {
2184                 arg.ftype = NF4CHR;
2185                 arg.u.device.specdata1 = MAJOR(rdev);
2186                 arg.u.device.specdata2 = MINOR(rdev);
2187         }
2188         else
2189                 arg.ftype = NF4SOCK;
2190
2191         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2192         if (status == 0) {
2193                 update_changeattr(dir, &res.dir_cinfo);
2194                 nfs_post_op_update_inode(dir, res.dir_fattr);
2195                 status = nfs_instantiate(dentry, &fh, &fattr);
2196         }
2197         return status;
2198 }
2199
2200 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2201                 struct iattr *sattr, dev_t rdev)
2202 {
2203         struct nfs4_exception exception = { };
2204         int err;
2205         do {
2206                 err = nfs4_handle_exception(NFS_SERVER(dir),
2207                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2208                                 &exception);
2209         } while (exception.retry);
2210         return err;
2211 }
2212
2213 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2214                  struct nfs_fsstat *fsstat)
2215 {
2216         struct nfs4_statfs_arg args = {
2217                 .fh = fhandle,
2218                 .bitmask = server->attr_bitmask,
2219         };
2220         struct rpc_message msg = {
2221                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2222                 .rpc_argp = &args,
2223                 .rpc_resp = fsstat,
2224         };
2225
2226         nfs_fattr_init(fsstat->fattr);
2227         return rpc_call_sync(server->client, &msg, 0);
2228 }
2229
2230 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2231 {
2232         struct nfs4_exception exception = { };
2233         int err;
2234         do {
2235                 err = nfs4_handle_exception(server,
2236                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2237                                 &exception);
2238         } while (exception.retry);
2239         return err;
2240 }
2241
2242 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2243                 struct nfs_fsinfo *fsinfo)
2244 {
2245         struct nfs4_fsinfo_arg args = {
2246                 .fh = fhandle,
2247                 .bitmask = server->attr_bitmask,
2248         };
2249         struct rpc_message msg = {
2250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2251                 .rpc_argp = &args,
2252                 .rpc_resp = fsinfo,
2253         };
2254
2255         return rpc_call_sync(server->client, &msg, 0);
2256 }
2257
2258 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2259 {
2260         struct nfs4_exception exception = { };
2261         int err;
2262
2263         do {
2264                 err = nfs4_handle_exception(server,
2265                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2266                                 &exception);
2267         } while (exception.retry);
2268         return err;
2269 }
2270
2271 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2272 {
2273         nfs_fattr_init(fsinfo->fattr);
2274         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2275 }
2276
2277 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2278                 struct nfs_pathconf *pathconf)
2279 {
2280         struct nfs4_pathconf_arg args = {
2281                 .fh = fhandle,
2282                 .bitmask = server->attr_bitmask,
2283         };
2284         struct rpc_message msg = {
2285                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2286                 .rpc_argp = &args,
2287                 .rpc_resp = pathconf,
2288         };
2289
2290         /* None of the pathconf attributes are mandatory to implement */
2291         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2292                 memset(pathconf, 0, sizeof(*pathconf));
2293                 return 0;
2294         }
2295
2296         nfs_fattr_init(pathconf->fattr);
2297         return rpc_call_sync(server->client, &msg, 0);
2298 }
2299
2300 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2301                 struct nfs_pathconf *pathconf)
2302 {
2303         struct nfs4_exception exception = { };
2304         int err;
2305
2306         do {
2307                 err = nfs4_handle_exception(server,
2308                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2309                                 &exception);
2310         } while (exception.retry);
2311         return err;
2312 }
2313
2314 static void nfs4_read_done(struct rpc_task *task, void *calldata)
2315 {
2316         struct nfs_read_data *data = calldata;
2317         struct inode *inode = data->inode;
2318
2319         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2320                 rpc_restart_call(task);
2321                 return;
2322         }
2323         if (task->tk_status > 0)
2324                 renew_lease(NFS_SERVER(inode), data->timestamp);
2325         /* Call back common NFS readpage processing */
2326         nfs_readpage_result(task, calldata);
2327 }
2328
2329 static const struct rpc_call_ops nfs4_read_ops = {
2330         .rpc_call_done = nfs4_read_done,
2331         .rpc_release = nfs_readdata_release,
2332 };
2333
2334 static void
2335 nfs4_proc_read_setup(struct nfs_read_data *data)
2336 {
2337         struct rpc_task *task = &data->task;
2338         struct rpc_message msg = {
2339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2340                 .rpc_argp = &data->args,
2341                 .rpc_resp = &data->res,
2342                 .rpc_cred = data->cred,
2343         };
2344         struct inode *inode = data->inode;
2345         int flags;
2346
2347         data->timestamp   = jiffies;
2348
2349         /* N.B. Do we need to test? Never called for swapfile inode */
2350         flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
2351
2352         /* Finalize the task. */
2353         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_read_ops, data);
2354         rpc_call_setup(task, &msg, 0);
2355 }
2356
2357 static void nfs4_write_done(struct rpc_task *task, void *calldata)
2358 {
2359         struct nfs_write_data *data = calldata;
2360         struct inode *inode = data->inode;
2361
2362         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2363                 rpc_restart_call(task);
2364                 return;
2365         }
2366         if (task->tk_status >= 0) {
2367                 renew_lease(NFS_SERVER(inode), data->timestamp);
2368                 nfs_post_op_update_inode(inode, data->res.fattr);
2369         }
2370         /* Call back common NFS writeback processing */
2371         nfs_writeback_done(task, calldata);
2372 }
2373
2374 static const struct rpc_call_ops nfs4_write_ops = {
2375         .rpc_call_done = nfs4_write_done,
2376         .rpc_release = nfs_writedata_release,
2377 };
2378
2379 static void
2380 nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2381 {
2382         struct rpc_task *task = &data->task;
2383         struct rpc_message msg = {
2384                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2385                 .rpc_argp = &data->args,
2386                 .rpc_resp = &data->res,
2387                 .rpc_cred = data->cred,
2388         };
2389         struct inode *inode = data->inode;
2390         struct nfs_server *server = NFS_SERVER(inode);
2391         int stable;
2392         int flags;
2393
2394         if (how & FLUSH_STABLE) {
2395                 if (!NFS_I(inode)->ncommit)
2396                         stable = NFS_FILE_SYNC;
2397                 else
2398                         stable = NFS_DATA_SYNC;
2399         } else
2400                 stable = NFS_UNSTABLE;
2401         data->args.stable = stable;
2402         data->args.bitmask = server->attr_bitmask;
2403         data->res.server = server;
2404
2405         data->timestamp   = jiffies;
2406
2407         /* Set the initial flags for the task.  */
2408         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2409
2410         /* Finalize the task. */
2411         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_write_ops, data);
2412         rpc_call_setup(task, &msg, 0);
2413 }
2414
2415 static void nfs4_commit_done(struct rpc_task *task, void *calldata)
2416 {
2417         struct nfs_write_data *data = calldata;
2418         struct inode *inode = data->inode;
2419
2420         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2421                 rpc_restart_call(task);
2422                 return;
2423         }
2424         if (task->tk_status >= 0)
2425                 nfs_post_op_update_inode(inode, data->res.fattr);
2426         /* Call back common NFS writeback processing */
2427         nfs_commit_done(task, calldata);
2428 }
2429
2430 static const struct rpc_call_ops nfs4_commit_ops = {
2431         .rpc_call_done = nfs4_commit_done,
2432         .rpc_release = nfs_commit_release,
2433 };
2434
2435 static void
2436 nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2437 {
2438         struct rpc_task *task = &data->task;
2439         struct rpc_message msg = {
2440                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2441                 .rpc_argp = &data->args,
2442                 .rpc_resp = &data->res,
2443                 .rpc_cred = data->cred,
2444         };
2445         struct inode *inode = data->inode;
2446         struct nfs_server *server = NFS_SERVER(inode);
2447         int flags;
2448
2449         data->args.bitmask = server->attr_bitmask;
2450         data->res.server = server;
2451
2452         /* Set the initial flags for the task.  */
2453         flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
2454
2455         /* Finalize the task. */
2456         rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_commit_ops, data);
2457         rpc_call_setup(task, &msg, 0);
2458 }
2459
2460 /*
2461  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2462  * standalone procedure for queueing an asynchronous RENEW.
2463  */
2464 static void nfs4_renew_done(struct rpc_task *task, void *data)
2465 {
2466         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2467         unsigned long timestamp = (unsigned long)data;
2468
2469         if (task->tk_status < 0) {
2470                 switch (task->tk_status) {
2471                         case -NFS4ERR_STALE_CLIENTID:
2472                         case -NFS4ERR_EXPIRED:
2473                         case -NFS4ERR_CB_PATH_DOWN:
2474                                 nfs4_schedule_state_recovery(clp);
2475                 }
2476                 return;
2477         }
2478         spin_lock(&clp->cl_lock);
2479         if (time_before(clp->cl_last_renewal,timestamp))
2480                 clp->cl_last_renewal = timestamp;
2481         spin_unlock(&clp->cl_lock);
2482 }
2483
2484 static const struct rpc_call_ops nfs4_renew_ops = {
2485         .rpc_call_done = nfs4_renew_done,
2486 };
2487
2488 int
2489 nfs4_proc_async_renew(struct nfs4_client *clp)
2490 {
2491         struct rpc_message msg = {
2492                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2493                 .rpc_argp       = clp,
2494                 .rpc_cred       = clp->cl_cred,
2495         };
2496
2497         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2498                         &nfs4_renew_ops, (void *)jiffies);
2499 }
2500
2501 int
2502 nfs4_proc_renew(struct nfs4_client *clp)
2503 {
2504         struct rpc_message msg = {
2505                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2506                 .rpc_argp       = clp,
2507                 .rpc_cred       = clp->cl_cred,
2508         };
2509         unsigned long now = jiffies;
2510         int status;
2511
2512         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2513         if (status < 0)
2514                 return status;
2515         spin_lock(&clp->cl_lock);
2516         if (time_before(clp->cl_last_renewal,now))
2517                 clp->cl_last_renewal = now;
2518         spin_unlock(&clp->cl_lock);
2519         return 0;
2520 }
2521
2522 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2523 {
2524         return (server->caps & NFS_CAP_ACLS)
2525                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2526                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2527 }
2528
2529 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2530  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2531  * the stack.
2532  */
2533 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2534
2535 static void buf_to_pages(const void *buf, size_t buflen,
2536                 struct page **pages, unsigned int *pgbase)
2537 {
2538         const void *p = buf;
2539
2540         *pgbase = offset_in_page(buf);
2541         p -= *pgbase;
2542         while (p < buf + buflen) {
2543                 *(pages++) = virt_to_page(p);
2544                 p += PAGE_CACHE_SIZE;
2545         }
2546 }
2547
2548 struct nfs4_cached_acl {
2549         int cached;
2550         size_t len;
2551         char data[0];
2552 };
2553
2554 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2555 {
2556         struct nfs_inode *nfsi = NFS_I(inode);
2557
2558         spin_lock(&inode->i_lock);
2559         kfree(nfsi->nfs4_acl);
2560         nfsi->nfs4_acl = acl;
2561         spin_unlock(&inode->i_lock);
2562 }
2563
2564 static void nfs4_zap_acl_attr(struct inode *inode)
2565 {
2566         nfs4_set_cached_acl(inode, NULL);
2567 }
2568
2569 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2570 {
2571         struct nfs_inode *nfsi = NFS_I(inode);
2572         struct nfs4_cached_acl *acl;
2573         int ret = -ENOENT;
2574
2575         spin_lock(&inode->i_lock);
2576         acl = nfsi->nfs4_acl;
2577         if (acl == NULL)
2578                 goto out;
2579         if (buf == NULL) /* user is just asking for length */
2580                 goto out_len;
2581         if (acl->cached == 0)
2582                 goto out;
2583         ret = -ERANGE; /* see getxattr(2) man page */
2584         if (acl->len > buflen)
2585                 goto out;
2586         memcpy(buf, acl->data, acl->len);
2587 out_len:
2588         ret = acl->len;
2589 out:
2590         spin_unlock(&inode->i_lock);
2591         return ret;
2592 }
2593
2594 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2595 {
2596         struct nfs4_cached_acl *acl;
2597
2598         if (buf && acl_len <= PAGE_SIZE) {
2599                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2600                 if (acl == NULL)
2601                         goto out;
2602                 acl->cached = 1;
2603                 memcpy(acl->data, buf, acl_len);
2604         } else {
2605                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2606                 if (acl == NULL)
2607                         goto out;
2608                 acl->cached = 0;
2609         }
2610         acl->len = acl_len;
2611 out:
2612         nfs4_set_cached_acl(inode, acl);
2613 }
2614
2615 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2616 {
2617         struct page *pages[NFS4ACL_MAXPAGES];
2618         struct nfs_getaclargs args = {
2619                 .fh = NFS_FH(inode),
2620                 .acl_pages = pages,
2621                 .acl_len = buflen,
2622         };
2623         size_t resp_len = buflen;
2624         void *resp_buf;
2625         struct rpc_message msg = {
2626                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2627                 .rpc_argp = &args,
2628                 .rpc_resp = &resp_len,
2629         };
2630         struct page *localpage = NULL;
2631         int ret;
2632
2633         if (buflen < PAGE_SIZE) {
2634                 /* As long as we're doing a round trip to the server anyway,
2635                  * let's be prepared for a page of acl data. */
2636                 localpage = alloc_page(GFP_KERNEL);
2637                 resp_buf = page_address(localpage);
2638                 if (localpage == NULL)
2639                         return -ENOMEM;
2640                 args.acl_pages[0] = localpage;
2641                 args.acl_pgbase = 0;
2642                 resp_len = args.acl_len = PAGE_SIZE;
2643         } else {
2644                 resp_buf = buf;
2645                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2646         }
2647         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2648         if (ret)
2649                 goto out_free;
2650         if (resp_len > args.acl_len)
2651                 nfs4_write_cached_acl(inode, NULL, resp_len);
2652         else
2653                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2654         if (buf) {
2655                 ret = -ERANGE;
2656                 if (resp_len > buflen)
2657                         goto out_free;
2658                 if (localpage)
2659                         memcpy(buf, resp_buf, resp_len);
2660         }
2661         ret = resp_len;
2662 out_free:
2663         if (localpage)
2664                 __free_page(localpage);
2665         return ret;
2666 }
2667
2668 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2669 {
2670         struct nfs_server *server = NFS_SERVER(inode);
2671         int ret;
2672
2673         if (!nfs4_server_supports_acls(server))
2674                 return -EOPNOTSUPP;
2675         ret = nfs_revalidate_inode(server, inode);
2676         if (ret < 0)
2677                 return ret;
2678         ret = nfs4_read_cached_acl(inode, buf, buflen);
2679         if (ret != -ENOENT)
2680                 return ret;
2681         return nfs4_get_acl_uncached(inode, buf, buflen);
2682 }
2683
2684 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2685 {
2686         struct nfs_server *server = NFS_SERVER(inode);
2687         struct page *pages[NFS4ACL_MAXPAGES];
2688         struct nfs_setaclargs arg = {
2689                 .fh             = NFS_FH(inode),
2690                 .acl_pages      = pages,
2691                 .acl_len        = buflen,
2692         };
2693         struct rpc_message msg = {
2694                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2695                 .rpc_argp       = &arg,
2696                 .rpc_resp       = NULL,
2697         };
2698         int ret;
2699
2700         if (!nfs4_server_supports_acls(server))
2701                 return -EOPNOTSUPP;
2702         nfs_inode_return_delegation(inode);
2703         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2704         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2705         if (ret == 0)
2706                 nfs4_write_cached_acl(inode, buf, buflen);
2707         return ret;
2708 }
2709
2710 static int
2711 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2712 {
2713         struct nfs4_client *clp = server->nfs4_state;
2714
2715         if (!clp || task->tk_status >= 0)
2716                 return 0;
2717         switch(task->tk_status) {
2718                 case -NFS4ERR_STALE_CLIENTID:
2719                 case -NFS4ERR_STALE_STATEID:
2720                 case -NFS4ERR_EXPIRED:
2721                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2722                         nfs4_schedule_state_recovery(clp);
2723                         if (test_bit(NFS4CLNT_OK, &clp->cl_state))
2724                                 rpc_wake_up_task(task);
2725                         task->tk_status = 0;
2726                         return -EAGAIN;
2727                 case -NFS4ERR_GRACE:
2728                 case -NFS4ERR_DELAY:
2729                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2730                         task->tk_status = 0;
2731                         return -EAGAIN;
2732                 case -NFS4ERR_OLD_STATEID:
2733                         task->tk_status = 0;
2734                         return -EAGAIN;
2735         }
2736         task->tk_status = nfs4_map_errors(task->tk_status);
2737         return 0;
2738 }
2739
2740 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2741 {
2742         DEFINE_WAIT(wait);
2743         sigset_t oldset;
2744         int interruptible, res = 0;
2745
2746         might_sleep();
2747
2748         rpc_clnt_sigmask(clnt, &oldset);
2749         interruptible = TASK_UNINTERRUPTIBLE;
2750         if (clnt->cl_intr)
2751                 interruptible = TASK_INTERRUPTIBLE;
2752         prepare_to_wait(&clp->cl_waitq, &wait, interruptible);
2753         nfs4_schedule_state_recovery(clp);
2754         if (clnt->cl_intr && signalled())
2755                 res = -ERESTARTSYS;
2756         else if (!test_bit(NFS4CLNT_OK, &clp->cl_state))
2757                 schedule();
2758         finish_wait(&clp->cl_waitq, &wait);
2759         rpc_clnt_sigunmask(clnt, &oldset);
2760         return res;
2761 }
2762
2763 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2764 {
2765         sigset_t oldset;
2766         int res = 0;
2767
2768         might_sleep();
2769
2770         if (*timeout <= 0)
2771                 *timeout = NFS4_POLL_RETRY_MIN;
2772         if (*timeout > NFS4_POLL_RETRY_MAX)
2773                 *timeout = NFS4_POLL_RETRY_MAX;
2774         rpc_clnt_sigmask(clnt, &oldset);
2775         if (clnt->cl_intr) {
2776                 schedule_timeout_interruptible(*timeout);
2777                 if (signalled())
2778                         res = -ERESTARTSYS;
2779         } else
2780                 schedule_timeout_uninterruptible(*timeout);
2781         rpc_clnt_sigunmask(clnt, &oldset);
2782         *timeout <<= 1;
2783         return res;
2784 }
2785
2786 /* This is the error handling routine for processes that are allowed
2787  * to sleep.
2788  */
2789 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2790 {
2791         struct nfs4_client *clp = server->nfs4_state;
2792         int ret = errorcode;
2793
2794         exception->retry = 0;
2795         switch(errorcode) {
2796                 case 0:
2797                         return 0;
2798                 case -NFS4ERR_STALE_CLIENTID:
2799                 case -NFS4ERR_STALE_STATEID:
2800                 case -NFS4ERR_EXPIRED:
2801                         ret = nfs4_wait_clnt_recover(server->client, clp);
2802                         if (ret == 0)
2803                                 exception->retry = 1;
2804                         break;
2805                 case -NFS4ERR_GRACE:
2806                 case -NFS4ERR_DELAY:
2807                         ret = nfs4_delay(server->client, &exception->timeout);
2808                         if (ret != 0)
2809                                 break;
2810                 case -NFS4ERR_OLD_STATEID:
2811                         exception->retry = 1;
2812         }
2813         /* We failed to handle the error */
2814         return nfs4_map_errors(ret);
2815 }
2816
2817 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
2818 {
2819         nfs4_verifier sc_verifier;
2820         struct nfs4_setclientid setclientid = {
2821                 .sc_verifier = &sc_verifier,
2822                 .sc_prog = program,
2823         };
2824         struct rpc_message msg = {
2825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2826                 .rpc_argp = &setclientid,
2827                 .rpc_resp = clp,
2828                 .rpc_cred = clp->cl_cred,
2829         };
2830         u32 *p;
2831         int loop = 0;
2832         int status;
2833
2834         p = (u32*)sc_verifier.data;
2835         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2836         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2837
2838         for(;;) {
2839                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2840                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2841                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2842                                 clp->cl_cred->cr_ops->cr_name,
2843                                 clp->cl_id_uniquifier);
2844                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2845                                 sizeof(setclientid.sc_netid), "tcp");
2846                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2847                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2848                                 clp->cl_ipaddr, port >> 8, port & 255);
2849
2850                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2851                 if (status != -NFS4ERR_CLID_INUSE)
2852                         break;
2853                 if (signalled())
2854                         break;
2855                 if (loop++ & 1)
2856                         ssleep(clp->cl_lease_time + 1);
2857                 else
2858                         if (++clp->cl_id_uniquifier == 0)
2859                                 break;
2860         }
2861         return status;
2862 }
2863
2864 int
2865 nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
2866 {
2867         struct nfs_fsinfo fsinfo;
2868         struct rpc_message msg = {
2869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2870                 .rpc_argp = clp,
2871                 .rpc_resp = &fsinfo,
2872                 .rpc_cred = clp->cl_cred,
2873         };
2874         unsigned long now;
2875         int status;
2876
2877         now = jiffies;
2878         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2879         if (status == 0) {
2880                 spin_lock(&clp->cl_lock);
2881                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2882                 clp->cl_last_renewal = now;
2883                 spin_unlock(&clp->cl_lock);
2884         }
2885         return status;
2886 }
2887
2888 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2889 {
2890         struct nfs4_delegreturnargs args = {
2891                 .fhandle = NFS_FH(inode),
2892                 .stateid = stateid,
2893         };
2894         struct rpc_message msg = {
2895                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2896                 .rpc_argp = &args,
2897                 .rpc_cred = cred,
2898         };
2899
2900         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2901 }
2902
2903 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2904 {
2905         struct nfs_server *server = NFS_SERVER(inode);
2906         struct nfs4_exception exception = { };
2907         int err;
2908         do {
2909                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
2910                 switch (err) {
2911                         case -NFS4ERR_STALE_STATEID:
2912                         case -NFS4ERR_EXPIRED:
2913                                 nfs4_schedule_state_recovery(server->nfs4_state);
2914                         case 0:
2915                                 return 0;
2916                 }
2917                 err = nfs4_handle_exception(server, err, &exception);
2918         } while (exception.retry);
2919         return err;
2920 }
2921
2922 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
2923 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
2924
2925 /*
2926  * sleep, with exponential backoff, and retry the LOCK operation.
2927  */
2928 static unsigned long
2929 nfs4_set_lock_task_retry(unsigned long timeout)
2930 {
2931         schedule_timeout_interruptible(timeout);
2932         timeout <<= 1;
2933         if (timeout > NFS4_LOCK_MAXTIMEOUT)
2934                 return NFS4_LOCK_MAXTIMEOUT;
2935         return timeout;
2936 }
2937
2938 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2939 {
2940         struct inode *inode = state->inode;
2941         struct nfs_server *server = NFS_SERVER(inode);
2942         struct nfs4_client *clp = server->nfs4_state;
2943         struct nfs_lockt_args arg = {
2944                 .fh = NFS_FH(inode),
2945                 .fl = request,
2946         };
2947         struct nfs_lockt_res res = {
2948                 .denied = request,
2949         };
2950         struct rpc_message msg = {
2951                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
2952                 .rpc_argp       = &arg,
2953                 .rpc_resp       = &res,
2954                 .rpc_cred       = state->owner->so_cred,
2955         };
2956         struct nfs4_lock_state *lsp;
2957         int status;
2958
2959         down_read(&clp->cl_sem);
2960         arg.lock_owner.clientid = clp->cl_clientid;
2961         status = nfs4_set_lock_state(state, request);
2962         if (status != 0)
2963                 goto out;
2964         lsp = request->fl_u.nfs4_fl.owner;
2965         arg.lock_owner.id = lsp->ls_id;
2966         status = rpc_call_sync(server->client, &msg, 0);
2967         switch (status) {
2968                 case 0:
2969                         request->fl_type = F_UNLCK;
2970                         break;
2971                 case -NFS4ERR_DENIED:
2972                         status = 0;
2973         }
2974 out:
2975         up_read(&clp->cl_sem);
2976         return status;
2977 }
2978
2979 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
2980 {
2981         struct nfs4_exception exception = { };
2982         int err;
2983
2984         do {
2985                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
2986                                 _nfs4_proc_getlk(state, cmd, request),
2987                                 &exception);
2988         } while (exception.retry);
2989         return err;
2990 }
2991
2992 static int do_vfs_lock(struct file *file, struct file_lock *fl)
2993 {
2994         int res = 0;
2995         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
2996                 case FL_POSIX:
2997                         res = posix_lock_file_wait(file, fl);
2998                         break;
2999                 case FL_FLOCK:
3000                         res = flock_lock_file_wait(file, fl);
3001                         break;
3002                 default:
3003                         BUG();
3004         }
3005         if (res < 0)
3006                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
3007                                 __FUNCTION__);
3008         return res;
3009 }
3010
3011 struct nfs4_unlockdata {
3012         struct nfs_locku_args arg;
3013         struct nfs_locku_res res;
3014         struct nfs4_lock_state *lsp;
3015         struct nfs_open_context *ctx;
3016         struct file_lock fl;
3017         const struct nfs_server *server;
3018 };
3019
3020 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3021                 struct nfs_open_context *ctx,
3022                 struct nfs4_lock_state *lsp,
3023                 struct nfs_seqid *seqid)
3024 {
3025         struct nfs4_unlockdata *p;
3026         struct inode *inode = lsp->ls_state->inode;
3027
3028         p = kmalloc(sizeof(*p), GFP_KERNEL);
3029         if (p == NULL)
3030                 return NULL;
3031         p->arg.fh = NFS_FH(inode);
3032         p->arg.fl = &p->fl;
3033         p->arg.seqid = seqid;
3034         p->arg.stateid = &lsp->ls_stateid;
3035         p->lsp = lsp;
3036         atomic_inc(&lsp->ls_count);
3037         /* Ensure we don't close file until we're done freeing locks! */
3038         p->ctx = get_nfs_open_context(ctx);
3039         memcpy(&p->fl, fl, sizeof(p->fl));
3040         p->server = NFS_SERVER(inode);
3041         return p;
3042 }
3043
3044 static void nfs4_locku_release_calldata(void *data)
3045 {
3046         struct nfs4_unlockdata *calldata = data;
3047         nfs_free_seqid(calldata->arg.seqid);
3048         nfs4_put_lock_state(calldata->lsp);
3049         put_nfs_open_context(calldata->ctx);
3050         kfree(calldata);
3051 }
3052
3053 static void nfs4_locku_done(struct rpc_task *task, void *data)
3054 {
3055         struct nfs4_unlockdata *calldata = data;
3056
3057         if (RPC_ASSASSINATED(task))
3058                 return;
3059         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3060         switch (task->tk_status) {
3061                 case 0:
3062                         memcpy(calldata->lsp->ls_stateid.data,
3063                                         calldata->res.stateid.data,
3064                                         sizeof(calldata->lsp->ls_stateid.data));
3065                         break;
3066                 case -NFS4ERR_STALE_STATEID:
3067                 case -NFS4ERR_EXPIRED:
3068                         nfs4_schedule_state_recovery(calldata->server->nfs4_state);
3069                         break;
3070                 default:
3071                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3072                                 rpc_restart_call(task);
3073                         }
3074         }
3075 }
3076
3077 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3078 {
3079         struct nfs4_unlockdata *calldata = data;
3080         struct rpc_message msg = {
3081                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3082                 .rpc_argp       = &calldata->arg,
3083                 .rpc_resp       = &calldata->res,
3084                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3085         };
3086
3087         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3088                 return;
3089         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3090                 /* Note: exit _without_ running nfs4_locku_done */
3091                 task->tk_action = NULL;
3092                 return;
3093         }
3094         rpc_call_setup(task, &msg, 0);
3095 }
3096
3097 static const struct rpc_call_ops nfs4_locku_ops = {
3098         .rpc_call_prepare = nfs4_locku_prepare,
3099         .rpc_call_done = nfs4_locku_done,
3100         .rpc_release = nfs4_locku_release_calldata,
3101 };
3102
3103 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3104                 struct nfs_open_context *ctx,
3105                 struct nfs4_lock_state *lsp,
3106                 struct nfs_seqid *seqid)
3107 {
3108         struct nfs4_unlockdata *data;
3109         struct rpc_task *task;
3110
3111         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3112         if (data == NULL) {
3113                 nfs_free_seqid(seqid);
3114                 return ERR_PTR(-ENOMEM);
3115         }
3116
3117         /* Unlock _before_ we do the RPC call */
3118         do_vfs_lock(fl->fl_file, fl);
3119         task = rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3120         if (IS_ERR(task))
3121                 nfs4_locku_release_calldata(data);
3122         return task;
3123 }
3124
3125 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3126 {
3127         struct nfs_seqid *seqid;
3128         struct nfs4_lock_state *lsp;
3129         struct rpc_task *task;
3130         int status = 0;
3131
3132         /* Is this a delegated lock? */
3133         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3134                 goto out_unlock;
3135         /* Is this open_owner holding any locks on the server? */
3136         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
3137                 goto out_unlock;
3138
3139         status = nfs4_set_lock_state(state, request);
3140         if (status != 0)
3141                 goto out_unlock;
3142         lsp = request->fl_u.nfs4_fl.owner;
3143         status = -ENOMEM;
3144         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3145         if (seqid == NULL)
3146                 goto out_unlock;
3147         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3148         status = PTR_ERR(task);
3149         if (IS_ERR(task))
3150                 goto out_unlock;
3151         status = nfs4_wait_for_completion_rpc_task(task);
3152         rpc_release_task(task);
3153         return status;
3154 out_unlock:
3155         do_vfs_lock(request->fl_file, request);
3156         return status;
3157 }
3158
3159 struct nfs4_lockdata {
3160         struct nfs_lock_args arg;
3161         struct nfs_lock_res res;
3162         struct nfs4_lock_state *lsp;
3163         struct nfs_open_context *ctx;
3164         struct file_lock fl;
3165         int rpc_status;
3166         int cancelled;
3167 };
3168
3169 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3170                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3171 {
3172         struct nfs4_lockdata *p;
3173         struct inode *inode = lsp->ls_state->inode;
3174         struct nfs_server *server = NFS_SERVER(inode);
3175
3176         p = kzalloc(sizeof(*p), GFP_KERNEL);
3177         if (p == NULL)
3178                 return NULL;
3179
3180         p->arg.fh = NFS_FH(inode);
3181         p->arg.fl = &p->fl;
3182         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3183         if (p->arg.lock_seqid == NULL)
3184                 goto out_free;
3185         p->arg.lock_stateid = &lsp->ls_stateid;
3186         p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid;
3187         p->arg.lock_owner.id = lsp->ls_id;
3188         p->lsp = lsp;
3189         atomic_inc(&lsp->ls_count);
3190         p->ctx = get_nfs_open_context(ctx);
3191         memcpy(&p->fl, fl, sizeof(p->fl));
3192         return p;
3193 out_free:
3194         kfree(p);
3195         return NULL;
3196 }
3197
3198 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3199 {
3200         struct nfs4_lockdata *data = calldata;
3201         struct nfs4_state *state = data->lsp->ls_state;
3202         struct nfs4_state_owner *sp = state->owner;
3203         struct rpc_message msg = {
3204                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3205                 .rpc_argp = &data->arg,
3206                 .rpc_resp = &data->res,
3207                 .rpc_cred = sp->so_cred,
3208         };
3209
3210         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3211                 return;
3212         dprintk("%s: begin!\n", __FUNCTION__);
3213         /* Do we need to do an open_to_lock_owner? */
3214         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3215                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3216                 if (data->arg.open_seqid == NULL) {
3217                         data->rpc_status = -ENOMEM;
3218                         task->tk_action = NULL;
3219                         goto out;
3220                 }
3221                 data->arg.open_stateid = &state->stateid;
3222                 data->arg.new_lock_owner = 1;
3223         }
3224         rpc_call_setup(task, &msg, 0);
3225 out:
3226         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3227 }
3228
3229 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3230 {
3231         struct nfs4_lockdata *data = calldata;
3232
3233         dprintk("%s: begin!\n", __FUNCTION__);
3234
3235         data->rpc_status = task->tk_status;
3236         if (RPC_ASSASSINATED(task))
3237                 goto out;
3238         if (data->arg.new_lock_owner != 0) {
3239                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3240                 if (data->rpc_status == 0)
3241                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3242                 else
3243                         goto out;
3244         }
3245         if (data->rpc_status == 0) {
3246                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3247                                         sizeof(data->lsp->ls_stateid.data));
3248                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3249         }
3250         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3251 out:
3252         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3253 }
3254
3255 static void nfs4_lock_release(void *calldata)
3256 {
3257         struct nfs4_lockdata *data = calldata;
3258
3259         dprintk("%s: begin!\n", __FUNCTION__);
3260         if (data->arg.open_seqid != NULL)
3261                 nfs_free_seqid(data->arg.open_seqid);
3262         if (data->cancelled != 0) {
3263                 struct rpc_task *task;
3264                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3265                                 data->arg.lock_seqid);
3266                 if (!IS_ERR(task))
3267                         rpc_release_task(task);
3268                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3269         } else
3270                 nfs_free_seqid(data->arg.lock_seqid);
3271         nfs4_put_lock_state(data->lsp);
3272         put_nfs_open_context(data->ctx);
3273         kfree(data);
3274         dprintk("%s: done!\n", __FUNCTION__);
3275 }
3276
3277 static const struct rpc_call_ops nfs4_lock_ops = {
3278         .rpc_call_prepare = nfs4_lock_prepare,
3279         .rpc_call_done = nfs4_lock_done,
3280         .rpc_release = nfs4_lock_release,
3281 };
3282
3283 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3284 {
3285         struct nfs4_lockdata *data;
3286         struct rpc_task *task;
3287         int ret;
3288
3289         dprintk("%s: begin!\n", __FUNCTION__);
3290         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3291                         fl->fl_u.nfs4_fl.owner);
3292         if (data == NULL)
3293                 return -ENOMEM;
3294         if (IS_SETLKW(cmd))
3295                 data->arg.block = 1;
3296         if (reclaim != 0)
3297                 data->arg.reclaim = 1;
3298         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3299                         &nfs4_lock_ops, data);
3300         if (IS_ERR(task)) {
3301                 nfs4_lock_release(data);
3302                 return PTR_ERR(task);
3303         }
3304         ret = nfs4_wait_for_completion_rpc_task(task);
3305         if (ret == 0) {
3306                 ret = data->rpc_status;
3307                 if (ret == -NFS4ERR_DENIED)
3308                         ret = -EAGAIN;
3309         } else
3310                 data->cancelled = 1;
3311         rpc_release_task(task);
3312         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3313         return ret;
3314 }
3315
3316 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3317 {
3318         struct nfs_server *server = NFS_SERVER(state->inode);
3319         struct nfs4_exception exception = { };
3320         int err;
3321
3322         /* Cache the lock if possible... */
3323         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3324                 return 0;
3325         do {
3326                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3327                 if (err != -NFS4ERR_DELAY)
3328                         break;
3329                 nfs4_handle_exception(server, err, &exception);
3330         } while (exception.retry);
3331         return err;
3332 }
3333
3334 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3335 {
3336         struct nfs_server *server = NFS_SERVER(state->inode);
3337         struct nfs4_exception exception = { };
3338         int err;
3339
3340         err = nfs4_set_lock_state(state, request);
3341         if (err != 0)
3342                 return err;
3343         do {
3344                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3345                 if (err != -NFS4ERR_DELAY)
3346                         break;
3347                 nfs4_handle_exception(server, err, &exception);
3348         } while (exception.retry);
3349         return err;
3350 }
3351
3352 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3353 {
3354         struct nfs4_client *clp = state->owner->so_client;
3355         int status;
3356
3357         /* Is this a delegated open? */
3358         if (NFS_I(state->inode)->delegation_state != 0) {
3359                 /* Yes: cache locks! */
3360                 status = do_vfs_lock(request->fl_file, request);
3361                 /* ...but avoid races with delegation recall... */
3362                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3363                         return status;
3364         }
3365         down_read(&clp->cl_sem);
3366         status = nfs4_set_lock_state(state, request);
3367         if (status != 0)
3368                 goto out;
3369         status = _nfs4_do_setlk(state, cmd, request, 0);
3370         if (status != 0)
3371                 goto out;
3372         /* Note: we always want to sleep here! */
3373         request->fl_flags |= FL_SLEEP;
3374         if (do_vfs_lock(request->fl_file, request) < 0)
3375                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3376 out:
3377         up_read(&clp->cl_sem);
3378         return status;
3379 }
3380
3381 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3382 {
3383         struct nfs4_exception exception = { };
3384         int err;
3385
3386         do {
3387                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3388                                 _nfs4_proc_setlk(state, cmd, request),
3389                                 &exception);
3390         } while (exception.retry);
3391         return err;
3392 }
3393
3394 static int
3395 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3396 {
3397         struct nfs_open_context *ctx;
3398         struct nfs4_state *state;
3399         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3400         int status;
3401
3402         /* verify open state */
3403         ctx = (struct nfs_open_context *)filp->private_data;
3404         state = ctx->state;
3405
3406         if (request->fl_start < 0 || request->fl_end < 0)
3407                 return -EINVAL;
3408
3409         if (IS_GETLK(cmd))
3410                 return nfs4_proc_getlk(state, F_GETLK, request);
3411
3412         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3413                 return -EINVAL;
3414
3415         if (request->fl_type == F_UNLCK)
3416                 return nfs4_proc_unlck(state, cmd, request);
3417
3418         do {
3419                 status = nfs4_proc_setlk(state, cmd, request);
3420                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3421                         break;
3422                 timeout = nfs4_set_lock_task_retry(timeout);
3423                 status = -ERESTARTSYS;
3424                 if (signalled())
3425                         break;
3426         } while(status < 0);
3427         return status;
3428 }
3429
3430 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3431 {
3432         struct nfs_server *server = NFS_SERVER(state->inode);
3433         struct nfs4_exception exception = { };
3434         int err;
3435
3436         err = nfs4_set_lock_state(state, fl);
3437         if (err != 0)
3438                 goto out;
3439         do {
3440                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3441                 if (err != -NFS4ERR_DELAY)
3442                         break;
3443                 err = nfs4_handle_exception(server, err, &exception);
3444         } while (exception.retry);
3445 out:
3446         return err;
3447 }
3448
3449 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3450
3451 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3452                 size_t buflen, int flags)
3453 {
3454         struct inode *inode = dentry->d_inode;
3455
3456         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3457                 return -EOPNOTSUPP;
3458
3459         if (!S_ISREG(inode->i_mode) &&
3460             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3461                 return -EPERM;
3462
3463         return nfs4_proc_set_acl(inode, buf, buflen);
3464 }
3465
3466 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3467  * and that's what we'll do for e.g. user attributes that haven't been set.
3468  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3469  * attributes in kernel-managed attribute namespaces. */
3470 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3471                 size_t buflen)
3472 {
3473         struct inode *inode = dentry->d_inode;
3474
3475         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3476                 return -EOPNOTSUPP;
3477
3478         return nfs4_proc_get_acl(inode, buf, buflen);
3479 }
3480
3481 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3482 {
3483         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3484
3485         if (buf && buflen < len)
3486                 return -ERANGE;
3487         if (buf)
3488                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3489         return len;
3490 }
3491
3492 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3493         .recover_open   = nfs4_open_reclaim,
3494         .recover_lock   = nfs4_lock_reclaim,
3495 };
3496
3497 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3498         .recover_open   = nfs4_open_expired,
3499         .recover_lock   = nfs4_lock_expired,
3500 };
3501
3502 static struct inode_operations nfs4_file_inode_operations = {
3503         .permission     = nfs_permission,
3504         .getattr        = nfs_getattr,
3505         .setattr        = nfs_setattr,
3506         .getxattr       = nfs4_getxattr,
3507         .setxattr       = nfs4_setxattr,
3508         .listxattr      = nfs4_listxattr,
3509 };
3510
3511 struct nfs_rpc_ops      nfs_v4_clientops = {
3512         .version        = 4,                    /* protocol version */
3513         .dentry_ops     = &nfs4_dentry_operations,
3514         .dir_inode_ops  = &nfs4_dir_inode_operations,
3515         .file_inode_ops = &nfs4_file_inode_operations,
3516         .getroot        = nfs4_proc_get_root,
3517         .getattr        = nfs4_proc_getattr,
3518         .setattr        = nfs4_proc_setattr,
3519         .lookup         = nfs4_proc_lookup,
3520         .access         = nfs4_proc_access,
3521         .readlink       = nfs4_proc_readlink,
3522         .read           = nfs4_proc_read,
3523         .write          = nfs4_proc_write,
3524         .commit         = nfs4_proc_commit,
3525         .create         = nfs4_proc_create,
3526         .remove         = nfs4_proc_remove,
3527         .unlink_setup   = nfs4_proc_unlink_setup,
3528         .unlink_done    = nfs4_proc_unlink_done,
3529         .rename         = nfs4_proc_rename,
3530         .link           = nfs4_proc_link,
3531         .symlink        = nfs4_proc_symlink,
3532         .mkdir          = nfs4_proc_mkdir,
3533         .rmdir          = nfs4_proc_remove,
3534         .readdir        = nfs4_proc_readdir,
3535         .mknod          = nfs4_proc_mknod,
3536         .statfs         = nfs4_proc_statfs,
3537         .fsinfo         = nfs4_proc_fsinfo,
3538         .pathconf       = nfs4_proc_pathconf,
3539         .decode_dirent  = nfs4_decode_dirent,
3540         .read_setup     = nfs4_proc_read_setup,
3541         .write_setup    = nfs4_proc_write_setup,
3542         .commit_setup   = nfs4_proc_commit_setup,
3543         .file_open      = nfs_open,
3544         .file_release   = nfs_release,
3545         .lock           = nfs4_proc_lock,
3546         .clear_acl_cache = nfs4_zap_acl_attr,
3547 };
3548
3549 /*
3550  * Local variables:
3551  *  c-basic-offset: 8
3552  * End:
3553  */