1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/utsname.h> 40 #include <linux/delay.h> 41 #include <linux/errno.h> 42 #include <linux/string.h> 43 #include <linux/sunrpc/clnt.h> 44 #include <linux/nfs.h> 45 #include <linux/nfs4.h> 46 #include <linux/nfs_fs.h> 47 #include <linux/nfs_page.h> 48 #include <linux/smp_lock.h> 49 #include <linux/namei.h> 50 #include <linux/mount.h> 51 52 #include "nfs4_fs.h" 53 #include "delegation.h" 54 #include "iostat.h" 55 56 #define NFSDBG_FACILITY NFSDBG_PROC 57 58 #define NFS4_POLL_RETRY_MIN (HZ/10) 59 #define NFS4_POLL_RETRY_MAX (15*HZ) 60 61 struct nfs4_opendata; 62 static int _nfs4_proc_open(struct nfs4_opendata *data); 63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *); 65 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception); 66 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp); 67 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr); 68 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr); 69 70 /* Prevent leaks of NFSv4 errors into userland */ 71 int nfs4_map_errors(int err) 72 { 73 if (err < -1000) { 74 dprintk("%s could not handle NFSv4 error %d\n", 75 __FUNCTION__, -err); 76 return -EIO; 77 } 78 return err; 79 } 80 81 /* 82 * This is our standard bitmap for GETATTR requests. 83 */ 84 const u32 nfs4_fattr_bitmap[2] = { 85 FATTR4_WORD0_TYPE 86 | FATTR4_WORD0_CHANGE 87 | FATTR4_WORD0_SIZE 88 | FATTR4_WORD0_FSID 89 | FATTR4_WORD0_FILEID, 90 FATTR4_WORD1_MODE 91 | FATTR4_WORD1_NUMLINKS 92 | FATTR4_WORD1_OWNER 93 | FATTR4_WORD1_OWNER_GROUP 94 | FATTR4_WORD1_RAWDEV 95 | FATTR4_WORD1_SPACE_USED 96 | FATTR4_WORD1_TIME_ACCESS 97 | FATTR4_WORD1_TIME_METADATA 98 | FATTR4_WORD1_TIME_MODIFY 99 }; 100 101 const u32 nfs4_statfs_bitmap[2] = { 102 FATTR4_WORD0_FILES_AVAIL 103 | FATTR4_WORD0_FILES_FREE 104 | FATTR4_WORD0_FILES_TOTAL, 105 FATTR4_WORD1_SPACE_AVAIL 106 | FATTR4_WORD1_SPACE_FREE 107 | FATTR4_WORD1_SPACE_TOTAL 108 }; 109 110 const u32 nfs4_pathconf_bitmap[2] = { 111 FATTR4_WORD0_MAXLINK 112 | FATTR4_WORD0_MAXNAME, 113 0 114 }; 115 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE 117 | FATTR4_WORD0_MAXREAD 118 | FATTR4_WORD0_MAXWRITE 119 | FATTR4_WORD0_LEASE_TIME, 120 0 121 }; 122 123 const u32 nfs4_fs_locations_bitmap[2] = { 124 FATTR4_WORD0_TYPE 125 | FATTR4_WORD0_CHANGE 126 | FATTR4_WORD0_SIZE 127 | FATTR4_WORD0_FSID 128 | FATTR4_WORD0_FILEID 129 | FATTR4_WORD0_FS_LOCATIONS, 130 FATTR4_WORD1_MODE 131 | FATTR4_WORD1_NUMLINKS 132 | FATTR4_WORD1_OWNER 133 | FATTR4_WORD1_OWNER_GROUP 134 | FATTR4_WORD1_RAWDEV 135 | FATTR4_WORD1_SPACE_USED 136 | FATTR4_WORD1_TIME_ACCESS 137 | FATTR4_WORD1_TIME_METADATA 138 | FATTR4_WORD1_TIME_MODIFY 139 | FATTR4_WORD1_MOUNTED_ON_FILEID 140 }; 141 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 143 struct nfs4_readdir_arg *readdir) 144 { 145 __be32 *start, *p; 146 147 BUG_ON(readdir->count < 80); 148 if (cookie > 2) { 149 readdir->cookie = cookie; 150 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 151 return; 152 } 153 154 readdir->cookie = 0; 155 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 156 if (cookie == 2) 157 return; 158 159 /* 160 * NFSv4 servers do not return entries for '.' and '..' 161 * Therefore, we fake these entries here. We let '.' 162 * have cookie 0 and '..' have cookie 1. Note that 163 * when talking to the server, we always send cookie 0 164 * instead of 1 or 2. 165 */ 166 start = p = kmap_atomic(*readdir->pages, KM_USER0); 167 168 if (cookie == 0) { 169 *p++ = xdr_one; /* next */ 170 *p++ = xdr_zero; /* cookie, first word */ 171 *p++ = xdr_one; /* cookie, second word */ 172 *p++ = xdr_one; /* entry len */ 173 memcpy(p, ".\0\0\0", 4); /* entry */ 174 p++; 175 *p++ = xdr_one; /* bitmap length */ 176 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 177 *p++ = htonl(8); /* attribute buffer length */ 178 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode)); 179 } 180 181 *p++ = xdr_one; /* next */ 182 *p++ = xdr_zero; /* cookie, first word */ 183 *p++ = xdr_two; /* cookie, second word */ 184 *p++ = xdr_two; /* entry len */ 185 memcpy(p, "..\0\0", 4); /* entry */ 186 p++; 187 *p++ = xdr_one; /* bitmap length */ 188 *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ 189 *p++ = htonl(8); /* attribute buffer length */ 190 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode)); 191 192 readdir->pgbase = (char *)p - (char *)start; 193 readdir->count -= readdir->pgbase; 194 kunmap_atomic(start, KM_USER0); 195 } 196 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 198 { 199 struct nfs_client *clp = server->nfs_client; 200 spin_lock(&clp->cl_lock); 201 if (time_before(clp->cl_last_renewal,timestamp)) 202 clp->cl_last_renewal = timestamp; 203 spin_unlock(&clp->cl_lock); 204 } 205 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) 207 { 208 struct nfs_inode *nfsi = NFS_I(dir); 209 210 spin_lock(&dir->i_lock); 211 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA; 212 if (!cinfo->atomic || cinfo->before != nfsi->change_attr) 213 nfs_force_lookup_revalidate(dir); 214 nfsi->change_attr = cinfo->after; 215 spin_unlock(&dir->i_lock); 216 } 217 218 struct nfs4_opendata { 219 struct kref kref; 220 struct nfs_openargs o_arg; 221 struct nfs_openres o_res; 222 struct nfs_open_confirmargs c_arg; 223 struct nfs_open_confirmres c_res; 224 struct nfs_fattr f_attr; 225 struct nfs_fattr dir_attr; 226 struct path path; 227 struct dentry *dir; 228 struct nfs4_state_owner *owner; 229 struct nfs4_state *state; 230 struct iattr attrs; 231 unsigned long timestamp; 232 unsigned int rpc_done : 1; 233 int rpc_status; 234 int cancelled; 235 }; 236 237 238 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 239 { 240 p->o_res.f_attr = &p->f_attr; 241 p->o_res.dir_attr = &p->dir_attr; 242 p->o_res.server = p->o_arg.server; 243 nfs_fattr_init(&p->f_attr); 244 nfs_fattr_init(&p->dir_attr); 245 } 246 247 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path, 248 struct nfs4_state_owner *sp, int flags, 249 const struct iattr *attrs) 250 { 251 struct dentry *parent = dget_parent(path->dentry); 252 struct inode *dir = parent->d_inode; 253 struct nfs_server *server = NFS_SERVER(dir); 254 struct nfs4_opendata *p; 255 256 p = kzalloc(sizeof(*p), GFP_KERNEL); 257 if (p == NULL) 258 goto err; 259 p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid); 260 if (p->o_arg.seqid == NULL) 261 goto err_free; 262 p->path.mnt = mntget(path->mnt); 263 p->path.dentry = dget(path->dentry); 264 p->dir = parent; 265 p->owner = sp; 266 atomic_inc(&sp->so_count); 267 p->o_arg.fh = NFS_FH(dir); 268 p->o_arg.open_flags = flags, 269 p->o_arg.clientid = server->nfs_client->cl_clientid; 270 p->o_arg.id = sp->so_owner_id.id; 271 p->o_arg.name = &p->path.dentry->d_name; 272 p->o_arg.server = server; 273 p->o_arg.bitmask = server->attr_bitmask; 274 p->o_arg.claim = NFS4_OPEN_CLAIM_NULL; 275 if (flags & O_EXCL) { 276 u32 *s = (u32 *) p->o_arg.u.verifier.data; 277 s[0] = jiffies; 278 s[1] = current->pid; 279 } else if (flags & O_CREAT) { 280 p->o_arg.u.attrs = &p->attrs; 281 memcpy(&p->attrs, attrs, sizeof(p->attrs)); 282 } 283 p->c_arg.fh = &p->o_res.fh; 284 p->c_arg.stateid = &p->o_res.stateid; 285 p->c_arg.seqid = p->o_arg.seqid; 286 nfs4_init_opendata_res(p); 287 kref_init(&p->kref); 288 return p; 289 err_free: 290 kfree(p); 291 err: 292 dput(parent); 293 return NULL; 294 } 295 296 static void nfs4_opendata_free(struct kref *kref) 297 { 298 struct nfs4_opendata *p = container_of(kref, 299 struct nfs4_opendata, kref); 300 301 nfs_free_seqid(p->o_arg.seqid); 302 if (p->state != NULL) 303 nfs4_put_open_state(p->state); 304 nfs4_put_state_owner(p->owner); 305 dput(p->dir); 306 dput(p->path.dentry); 307 mntput(p->path.mnt); 308 kfree(p); 309 } 310 311 static void nfs4_opendata_put(struct nfs4_opendata *p) 312 { 313 if (p != NULL) 314 kref_put(&p->kref, nfs4_opendata_free); 315 } 316 317 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) 318 { 319 int ret; 320 321 ret = rpc_wait_for_completion_task(task); 322 return ret; 323 } 324 325 static int can_open_cached(struct nfs4_state *state, int mode) 326 { 327 int ret = 0; 328 switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) { 329 case FMODE_READ: 330 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0; 331 break; 332 case FMODE_WRITE: 333 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0; 334 break; 335 case FMODE_READ|FMODE_WRITE: 336 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0; 337 } 338 return ret; 339 } 340 341 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags) 342 { 343 if ((delegation->type & open_flags) != open_flags) 344 return 0; 345 if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) 346 return 0; 347 return 1; 348 } 349 350 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags) 351 { 352 switch (open_flags) { 353 case FMODE_WRITE: 354 state->n_wronly++; 355 break; 356 case FMODE_READ: 357 state->n_rdonly++; 358 break; 359 case FMODE_READ|FMODE_WRITE: 360 state->n_rdwr++; 361 } 362 nfs4_state_set_mode_locked(state, state->state | open_flags); 363 } 364 365 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) 366 { 367 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 368 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data)); 369 memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data)); 370 switch (open_flags) { 371 case FMODE_READ: 372 set_bit(NFS_O_RDONLY_STATE, &state->flags); 373 break; 374 case FMODE_WRITE: 375 set_bit(NFS_O_WRONLY_STATE, &state->flags); 376 break; 377 case FMODE_READ|FMODE_WRITE: 378 set_bit(NFS_O_RDWR_STATE, &state->flags); 379 } 380 } 381 382 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) 383 { 384 write_seqlock(&state->seqlock); 385 nfs_set_open_stateid_locked(state, stateid, open_flags); 386 write_sequnlock(&state->seqlock); 387 } 388 389 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags) 390 { 391 open_flags &= (FMODE_READ|FMODE_WRITE); 392 /* 393 * Protect the call to nfs4_state_set_mode_locked and 394 * serialise the stateid update 395 */ 396 write_seqlock(&state->seqlock); 397 if (deleg_stateid != NULL) { 398 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data)); 399 set_bit(NFS_DELEGATED_STATE, &state->flags); 400 } 401 if (open_stateid != NULL) 402 nfs_set_open_stateid_locked(state, open_stateid, open_flags); 403 write_sequnlock(&state->seqlock); 404 spin_lock(&state->owner->so_lock); 405 update_open_stateflags(state, open_flags); 406 spin_unlock(&state->owner->so_lock); 407 } 408 409 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags) 410 { 411 struct nfs_delegation *delegation; 412 413 rcu_read_lock(); 414 delegation = rcu_dereference(NFS_I(inode)->delegation); 415 if (delegation == NULL || (delegation->type & open_flags) == open_flags) { 416 rcu_read_unlock(); 417 return; 418 } 419 rcu_read_unlock(); 420 nfs_inode_return_delegation(inode); 421 } 422 423 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 424 { 425 struct nfs4_state *state = opendata->state; 426 struct nfs_inode *nfsi = NFS_I(state->inode); 427 struct nfs_delegation *delegation; 428 int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL); 429 nfs4_stateid stateid; 430 int ret = -EAGAIN; 431 432 rcu_read_lock(); 433 delegation = rcu_dereference(nfsi->delegation); 434 for (;;) { 435 if (can_open_cached(state, open_mode)) { 436 spin_lock(&state->owner->so_lock); 437 if (can_open_cached(state, open_mode)) { 438 update_open_stateflags(state, open_mode); 439 spin_unlock(&state->owner->so_lock); 440 rcu_read_unlock(); 441 goto out_return_state; 442 } 443 spin_unlock(&state->owner->so_lock); 444 } 445 if (delegation == NULL) 446 break; 447 if (!can_open_delegated(delegation, open_mode)) 448 break; 449 /* Save the delegation */ 450 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data)); 451 rcu_read_unlock(); 452 lock_kernel(); 453 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 454 unlock_kernel(); 455 if (ret != 0) 456 goto out; 457 ret = -EAGAIN; 458 rcu_read_lock(); 459 delegation = rcu_dereference(nfsi->delegation); 460 /* If no delegation, try a cached open */ 461 if (delegation == NULL) 462 continue; 463 /* Is the delegation still valid? */ 464 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0) 465 continue; 466 rcu_read_unlock(); 467 update_open_stateid(state, NULL, &stateid, open_mode); 468 goto out_return_state; 469 } 470 rcu_read_unlock(); 471 out: 472 return ERR_PTR(ret); 473 out_return_state: 474 atomic_inc(&state->count); 475 return state; 476 } 477 478 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 479 { 480 struct inode *inode; 481 struct nfs4_state *state = NULL; 482 struct nfs_delegation *delegation; 483 nfs4_stateid *deleg_stateid = NULL; 484 int ret; 485 486 if (!data->rpc_done) { 487 state = nfs4_try_open_cached(data); 488 goto out; 489 } 490 491 ret = -EAGAIN; 492 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 493 goto err; 494 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr); 495 ret = PTR_ERR(inode); 496 if (IS_ERR(inode)) 497 goto err; 498 ret = -ENOMEM; 499 state = nfs4_get_open_state(inode, data->owner); 500 if (state == NULL) 501 goto err_put_inode; 502 if (data->o_res.delegation_type != 0) { 503 int delegation_flags = 0; 504 505 rcu_read_lock(); 506 delegation = rcu_dereference(NFS_I(inode)->delegation); 507 if (delegation) 508 delegation_flags = delegation->flags; 509 rcu_read_unlock(); 510 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM)) 511 nfs_inode_set_delegation(state->inode, 512 data->owner->so_cred, 513 &data->o_res); 514 else 515 nfs_inode_reclaim_delegation(state->inode, 516 data->owner->so_cred, 517 &data->o_res); 518 } 519 rcu_read_lock(); 520 delegation = rcu_dereference(NFS_I(inode)->delegation); 521 if (delegation != NULL) 522 deleg_stateid = &delegation->stateid; 523 update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags); 524 rcu_read_unlock(); 525 iput(inode); 526 out: 527 return state; 528 err_put_inode: 529 iput(inode); 530 err: 531 return ERR_PTR(ret); 532 } 533 534 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) 535 { 536 struct nfs_inode *nfsi = NFS_I(state->inode); 537 struct nfs_open_context *ctx; 538 539 spin_lock(&state->inode->i_lock); 540 list_for_each_entry(ctx, &nfsi->open_files, list) { 541 if (ctx->state != state) 542 continue; 543 get_nfs_open_context(ctx); 544 spin_unlock(&state->inode->i_lock); 545 return ctx; 546 } 547 spin_unlock(&state->inode->i_lock); 548 return ERR_PTR(-ENOENT); 549 } 550 551 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state) 552 { 553 struct nfs4_opendata *opendata; 554 555 opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL); 556 if (opendata == NULL) 557 return ERR_PTR(-ENOMEM); 558 opendata->state = state; 559 atomic_inc(&state->count); 560 return opendata; 561 } 562 563 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res) 564 { 565 struct nfs4_state *newstate; 566 int ret; 567 568 opendata->o_arg.open_flags = openflags; 569 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 570 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 571 nfs4_init_opendata_res(opendata); 572 ret = _nfs4_proc_open(opendata); 573 if (ret != 0) 574 return ret; 575 newstate = nfs4_opendata_to_nfs4_state(opendata); 576 if (IS_ERR(newstate)) 577 return PTR_ERR(newstate); 578 nfs4_close_state(&opendata->path, newstate, openflags); 579 *res = newstate; 580 return 0; 581 } 582 583 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 584 { 585 struct nfs4_state *newstate; 586 int ret; 587 588 /* memory barrier prior to reading state->n_* */ 589 clear_bit(NFS_DELEGATED_STATE, &state->flags); 590 smp_rmb(); 591 if (state->n_rdwr != 0) { 592 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate); 593 if (ret != 0) 594 return ret; 595 if (newstate != state) 596 return -ESTALE; 597 } 598 if (state->n_wronly != 0) { 599 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate); 600 if (ret != 0) 601 return ret; 602 if (newstate != state) 603 return -ESTALE; 604 } 605 if (state->n_rdonly != 0) { 606 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate); 607 if (ret != 0) 608 return ret; 609 if (newstate != state) 610 return -ESTALE; 611 } 612 /* 613 * We may have performed cached opens for all three recoveries. 614 * Check if we need to update the current stateid. 615 */ 616 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 617 memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) { 618 write_seqlock(&state->seqlock); 619 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 620 memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)); 621 write_sequnlock(&state->seqlock); 622 } 623 return 0; 624 } 625 626 /* 627 * OPEN_RECLAIM: 628 * reclaim state on the server after a reboot. 629 */ 630 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 631 { 632 struct nfs_delegation *delegation; 633 struct nfs4_opendata *opendata; 634 int delegation_type = 0; 635 int status; 636 637 opendata = nfs4_open_recoverdata_alloc(ctx, state); 638 if (IS_ERR(opendata)) 639 return PTR_ERR(opendata); 640 opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS; 641 opendata->o_arg.fh = NFS_FH(state->inode); 642 rcu_read_lock(); 643 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 644 if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0) 645 delegation_type = delegation->type; 646 rcu_read_unlock(); 647 opendata->o_arg.u.delegation_type = delegation_type; 648 status = nfs4_open_recover(opendata, state); 649 nfs4_opendata_put(opendata); 650 return status; 651 } 652 653 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 654 { 655 struct nfs_server *server = NFS_SERVER(state->inode); 656 struct nfs4_exception exception = { }; 657 int err; 658 do { 659 err = _nfs4_do_open_reclaim(ctx, state); 660 if (err != -NFS4ERR_DELAY) 661 break; 662 nfs4_handle_exception(server, err, &exception); 663 } while (exception.retry); 664 return err; 665 } 666 667 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 668 { 669 struct nfs_open_context *ctx; 670 int ret; 671 672 ctx = nfs4_state_find_open_context(state); 673 if (IS_ERR(ctx)) 674 return PTR_ERR(ctx); 675 ret = nfs4_do_open_reclaim(ctx, state); 676 put_nfs_open_context(ctx); 677 return ret; 678 } 679 680 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 681 { 682 struct nfs4_opendata *opendata; 683 int ret; 684 685 opendata = nfs4_open_recoverdata_alloc(ctx, state); 686 if (IS_ERR(opendata)) 687 return PTR_ERR(opendata); 688 opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR; 689 memcpy(opendata->o_arg.u.delegation.data, stateid->data, 690 sizeof(opendata->o_arg.u.delegation.data)); 691 ret = nfs4_open_recover(opendata, state); 692 nfs4_opendata_put(opendata); 693 return ret; 694 } 695 696 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid) 697 { 698 struct nfs4_exception exception = { }; 699 struct nfs_server *server = NFS_SERVER(state->inode); 700 int err; 701 do { 702 err = _nfs4_open_delegation_recall(ctx, state, stateid); 703 switch (err) { 704 case 0: 705 return err; 706 case -NFS4ERR_STALE_CLIENTID: 707 case -NFS4ERR_STALE_STATEID: 708 case -NFS4ERR_EXPIRED: 709 /* Don't recall a delegation if it was lost */ 710 nfs4_schedule_state_recovery(server->nfs_client); 711 return err; 712 } 713 err = nfs4_handle_exception(server, err, &exception); 714 } while (exception.retry); 715 return err; 716 } 717 718 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 719 { 720 struct nfs4_opendata *data = calldata; 721 722 data->rpc_status = task->tk_status; 723 if (RPC_ASSASSINATED(task)) 724 return; 725 if (data->rpc_status == 0) { 726 memcpy(data->o_res.stateid.data, data->c_res.stateid.data, 727 sizeof(data->o_res.stateid.data)); 728 nfs_confirm_seqid(&data->owner->so_seqid, 0); 729 renew_lease(data->o_res.server, data->timestamp); 730 data->rpc_done = 1; 731 } 732 nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid); 733 } 734 735 static void nfs4_open_confirm_release(void *calldata) 736 { 737 struct nfs4_opendata *data = calldata; 738 struct nfs4_state *state = NULL; 739 740 /* If this request hasn't been cancelled, do nothing */ 741 if (data->cancelled == 0) 742 goto out_free; 743 /* In case of error, no cleanup! */ 744 if (!data->rpc_done) 745 goto out_free; 746 state = nfs4_opendata_to_nfs4_state(data); 747 if (!IS_ERR(state)) 748 nfs4_close_state(&data->path, state, data->o_arg.open_flags); 749 out_free: 750 nfs4_opendata_put(data); 751 } 752 753 static const struct rpc_call_ops nfs4_open_confirm_ops = { 754 .rpc_call_done = nfs4_open_confirm_done, 755 .rpc_release = nfs4_open_confirm_release, 756 }; 757 758 /* 759 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 760 */ 761 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 762 { 763 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 764 struct rpc_task *task; 765 struct rpc_message msg = { 766 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 767 .rpc_argp = &data->c_arg, 768 .rpc_resp = &data->c_res, 769 .rpc_cred = data->owner->so_cred, 770 }; 771 struct rpc_task_setup task_setup_data = { 772 .rpc_client = server->client, 773 .rpc_message = &msg, 774 .callback_ops = &nfs4_open_confirm_ops, 775 .callback_data = data, 776 .flags = RPC_TASK_ASYNC, 777 }; 778 int status; 779 780 kref_get(&data->kref); 781 data->rpc_done = 0; 782 data->rpc_status = 0; 783 data->timestamp = jiffies; 784 task = rpc_run_task(&task_setup_data); 785 if (IS_ERR(task)) 786 return PTR_ERR(task); 787 status = nfs4_wait_for_completion_rpc_task(task); 788 if (status != 0) { 789 data->cancelled = 1; 790 smp_wmb(); 791 } else 792 status = data->rpc_status; 793 rpc_put_task(task); 794 return status; 795 } 796 797 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 798 { 799 struct nfs4_opendata *data = calldata; 800 struct nfs4_state_owner *sp = data->owner; 801 802 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 803 return; 804 /* 805 * Check if we still need to send an OPEN call, or if we can use 806 * a delegation instead. 807 */ 808 if (data->state != NULL) { 809 struct nfs_delegation *delegation; 810 811 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL))) 812 goto out_no_action; 813 rcu_read_lock(); 814 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); 815 if (delegation != NULL && 816 (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) { 817 rcu_read_unlock(); 818 goto out_no_action; 819 } 820 rcu_read_unlock(); 821 } 822 /* Update sequence id. */ 823 data->o_arg.id = sp->so_owner_id.id; 824 data->o_arg.clientid = sp->so_client->cl_clientid; 825 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) { 826 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 827 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh); 828 } 829 data->timestamp = jiffies; 830 rpc_call_start(task); 831 return; 832 out_no_action: 833 task->tk_action = NULL; 834 835 } 836 837 static void nfs4_open_done(struct rpc_task *task, void *calldata) 838 { 839 struct nfs4_opendata *data = calldata; 840 841 data->rpc_status = task->tk_status; 842 if (RPC_ASSASSINATED(task)) 843 return; 844 if (task->tk_status == 0) { 845 switch (data->o_res.f_attr->mode & S_IFMT) { 846 case S_IFREG: 847 break; 848 case S_IFLNK: 849 data->rpc_status = -ELOOP; 850 break; 851 case S_IFDIR: 852 data->rpc_status = -EISDIR; 853 break; 854 default: 855 data->rpc_status = -ENOTDIR; 856 } 857 renew_lease(data->o_res.server, data->timestamp); 858 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 859 nfs_confirm_seqid(&data->owner->so_seqid, 0); 860 } 861 nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid); 862 data->rpc_done = 1; 863 } 864 865 static void nfs4_open_release(void *calldata) 866 { 867 struct nfs4_opendata *data = calldata; 868 struct nfs4_state *state = NULL; 869 870 /* If this request hasn't been cancelled, do nothing */ 871 if (data->cancelled == 0) 872 goto out_free; 873 /* In case of error, no cleanup! */ 874 if (data->rpc_status != 0 || !data->rpc_done) 875 goto out_free; 876 /* In case we need an open_confirm, no cleanup! */ 877 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 878 goto out_free; 879 state = nfs4_opendata_to_nfs4_state(data); 880 if (!IS_ERR(state)) 881 nfs4_close_state(&data->path, state, data->o_arg.open_flags); 882 out_free: 883 nfs4_opendata_put(data); 884 } 885 886 static const struct rpc_call_ops nfs4_open_ops = { 887 .rpc_call_prepare = nfs4_open_prepare, 888 .rpc_call_done = nfs4_open_done, 889 .rpc_release = nfs4_open_release, 890 }; 891 892 /* 893 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 894 */ 895 static int _nfs4_proc_open(struct nfs4_opendata *data) 896 { 897 struct inode *dir = data->dir->d_inode; 898 struct nfs_server *server = NFS_SERVER(dir); 899 struct nfs_openargs *o_arg = &data->o_arg; 900 struct nfs_openres *o_res = &data->o_res; 901 struct rpc_task *task; 902 struct rpc_message msg = { 903 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 904 .rpc_argp = o_arg, 905 .rpc_resp = o_res, 906 .rpc_cred = data->owner->so_cred, 907 }; 908 struct rpc_task_setup task_setup_data = { 909 .rpc_client = server->client, 910 .rpc_message = &msg, 911 .callback_ops = &nfs4_open_ops, 912 .callback_data = data, 913 .flags = RPC_TASK_ASYNC, 914 }; 915 int status; 916 917 kref_get(&data->kref); 918 data->rpc_done = 0; 919 data->rpc_status = 0; 920 data->cancelled = 0; 921 task = rpc_run_task(&task_setup_data); 922 if (IS_ERR(task)) 923 return PTR_ERR(task); 924 status = nfs4_wait_for_completion_rpc_task(task); 925 if (status != 0) { 926 data->cancelled = 1; 927 smp_wmb(); 928 } else 929 status = data->rpc_status; 930 rpc_put_task(task); 931 if (status != 0 || !data->rpc_done) 932 return status; 933 934 if (o_res->fh.size == 0) 935 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr); 936 937 if (o_arg->open_flags & O_CREAT) { 938 update_changeattr(dir, &o_res->cinfo); 939 nfs_post_op_update_inode(dir, o_res->dir_attr); 940 } else 941 nfs_refresh_inode(dir, o_res->dir_attr); 942 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 943 status = _nfs4_proc_open_confirm(data); 944 if (status != 0) 945 return status; 946 } 947 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) 948 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr); 949 return 0; 950 } 951 952 static int nfs4_recover_expired_lease(struct nfs_server *server) 953 { 954 struct nfs_client *clp = server->nfs_client; 955 int ret; 956 957 for (;;) { 958 ret = nfs4_wait_clnt_recover(server->client, clp); 959 if (ret != 0) 960 return ret; 961 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) 962 break; 963 nfs4_schedule_state_recovery(clp); 964 } 965 return 0; 966 } 967 968 /* 969 * OPEN_EXPIRED: 970 * reclaim state on the server after a network partition. 971 * Assumes caller holds the appropriate lock 972 */ 973 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 974 { 975 struct nfs4_opendata *opendata; 976 int ret; 977 978 opendata = nfs4_open_recoverdata_alloc(ctx, state); 979 if (IS_ERR(opendata)) 980 return PTR_ERR(opendata); 981 ret = nfs4_open_recover(opendata, state); 982 if (ret == -ESTALE) { 983 /* Invalidate the state owner so we don't ever use it again */ 984 nfs4_drop_state_owner(state->owner); 985 d_drop(ctx->path.dentry); 986 } 987 nfs4_opendata_put(opendata); 988 return ret; 989 } 990 991 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 992 { 993 struct nfs_server *server = NFS_SERVER(state->inode); 994 struct nfs4_exception exception = { }; 995 int err; 996 997 do { 998 err = _nfs4_open_expired(ctx, state); 999 if (err == -NFS4ERR_DELAY) 1000 nfs4_handle_exception(server, err, &exception); 1001 } while (exception.retry); 1002 return err; 1003 } 1004 1005 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 1006 { 1007 struct nfs_open_context *ctx; 1008 int ret; 1009 1010 ctx = nfs4_state_find_open_context(state); 1011 if (IS_ERR(ctx)) 1012 return PTR_ERR(ctx); 1013 ret = nfs4_do_open_expired(ctx, state); 1014 put_nfs_open_context(ctx); 1015 return ret; 1016 } 1017 1018 /* 1019 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 1020 * fields corresponding to attributes that were used to store the verifier. 1021 * Make sure we clobber those fields in the later setattr call 1022 */ 1023 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr) 1024 { 1025 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) && 1026 !(sattr->ia_valid & ATTR_ATIME_SET)) 1027 sattr->ia_valid |= ATTR_ATIME; 1028 1029 if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) && 1030 !(sattr->ia_valid & ATTR_MTIME_SET)) 1031 sattr->ia_valid |= ATTR_MTIME; 1032 } 1033 1034 /* 1035 * Returns a referenced nfs4_state 1036 */ 1037 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res) 1038 { 1039 struct nfs4_state_owner *sp; 1040 struct nfs4_state *state = NULL; 1041 struct nfs_server *server = NFS_SERVER(dir); 1042 struct nfs_client *clp = server->nfs_client; 1043 struct nfs4_opendata *opendata; 1044 int status; 1045 1046 /* Protect against reboot recovery conflicts */ 1047 status = -ENOMEM; 1048 if (!(sp = nfs4_get_state_owner(server, cred))) { 1049 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 1050 goto out_err; 1051 } 1052 status = nfs4_recover_expired_lease(server); 1053 if (status != 0) 1054 goto err_put_state_owner; 1055 if (path->dentry->d_inode != NULL) 1056 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE)); 1057 down_read(&clp->cl_sem); 1058 status = -ENOMEM; 1059 opendata = nfs4_opendata_alloc(path, sp, flags, sattr); 1060 if (opendata == NULL) 1061 goto err_release_rwsem; 1062 1063 if (path->dentry->d_inode != NULL) 1064 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp); 1065 1066 status = _nfs4_proc_open(opendata); 1067 if (status != 0) 1068 goto err_opendata_put; 1069 1070 if (opendata->o_arg.open_flags & O_EXCL) 1071 nfs4_exclusive_attrset(opendata, sattr); 1072 1073 state = nfs4_opendata_to_nfs4_state(opendata); 1074 status = PTR_ERR(state); 1075 if (IS_ERR(state)) 1076 goto err_opendata_put; 1077 nfs4_opendata_put(opendata); 1078 nfs4_put_state_owner(sp); 1079 up_read(&clp->cl_sem); 1080 *res = state; 1081 return 0; 1082 err_opendata_put: 1083 nfs4_opendata_put(opendata); 1084 err_release_rwsem: 1085 up_read(&clp->cl_sem); 1086 err_put_state_owner: 1087 nfs4_put_state_owner(sp); 1088 out_err: 1089 *res = NULL; 1090 return status; 1091 } 1092 1093 1094 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred) 1095 { 1096 struct nfs4_exception exception = { }; 1097 struct nfs4_state *res; 1098 int status; 1099 1100 do { 1101 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res); 1102 if (status == 0) 1103 break; 1104 /* NOTE: BAD_SEQID means the server and client disagree about the 1105 * book-keeping w.r.t. state-changing operations 1106 * (OPEN/CLOSE/LOCK/LOCKU...) 1107 * It is actually a sign of a bug on the client or on the server. 1108 * 1109 * If we receive a BAD_SEQID error in the particular case of 1110 * doing an OPEN, we assume that nfs_increment_open_seqid() will 1111 * have unhashed the old state_owner for us, and that we can 1112 * therefore safely retry using a new one. We should still warn 1113 * the user though... 1114 */ 1115 if (status == -NFS4ERR_BAD_SEQID) { 1116 printk(KERN_WARNING "NFS: v4 server %s " 1117 " returned a bad sequence-id error!\n", 1118 NFS_SERVER(dir)->nfs_client->cl_hostname); 1119 exception.retry = 1; 1120 continue; 1121 } 1122 /* 1123 * BAD_STATEID on OPEN means that the server cancelled our 1124 * state before it received the OPEN_CONFIRM. 1125 * Recover by retrying the request as per the discussion 1126 * on Page 181 of RFC3530. 1127 */ 1128 if (status == -NFS4ERR_BAD_STATEID) { 1129 exception.retry = 1; 1130 continue; 1131 } 1132 if (status == -EAGAIN) { 1133 /* We must have found a delegation */ 1134 exception.retry = 1; 1135 continue; 1136 } 1137 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir), 1138 status, &exception)); 1139 } while (exception.retry); 1140 return res; 1141 } 1142 1143 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr, 1144 struct iattr *sattr, struct nfs4_state *state) 1145 { 1146 struct nfs_server *server = NFS_SERVER(inode); 1147 struct nfs_setattrargs arg = { 1148 .fh = NFS_FH(inode), 1149 .iap = sattr, 1150 .server = server, 1151 .bitmask = server->attr_bitmask, 1152 }; 1153 struct nfs_setattrres res = { 1154 .fattr = fattr, 1155 .server = server, 1156 }; 1157 struct rpc_message msg = { 1158 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 1159 .rpc_argp = &arg, 1160 .rpc_resp = &res, 1161 }; 1162 unsigned long timestamp = jiffies; 1163 int status; 1164 1165 nfs_fattr_init(fattr); 1166 1167 if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) { 1168 /* Use that stateid */ 1169 } else if (state != NULL) { 1170 msg.rpc_cred = state->owner->so_cred; 1171 nfs4_copy_stateid(&arg.stateid, state, current->files); 1172 } else 1173 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid)); 1174 1175 status = rpc_call_sync(server->client, &msg, 0); 1176 if (status == 0 && state != NULL) 1177 renew_lease(server, timestamp); 1178 return status; 1179 } 1180 1181 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr, 1182 struct iattr *sattr, struct nfs4_state *state) 1183 { 1184 struct nfs_server *server = NFS_SERVER(inode); 1185 struct nfs4_exception exception = { }; 1186 int err; 1187 do { 1188 err = nfs4_handle_exception(server, 1189 _nfs4_do_setattr(inode, fattr, sattr, state), 1190 &exception); 1191 } while (exception.retry); 1192 return err; 1193 } 1194 1195 struct nfs4_closedata { 1196 struct path path; 1197 struct inode *inode; 1198 struct nfs4_state *state; 1199 struct nfs_closeargs arg; 1200 struct nfs_closeres res; 1201 struct nfs_fattr fattr; 1202 unsigned long timestamp; 1203 }; 1204 1205 static void nfs4_free_closedata(void *data) 1206 { 1207 struct nfs4_closedata *calldata = data; 1208 struct nfs4_state_owner *sp = calldata->state->owner; 1209 1210 nfs4_put_open_state(calldata->state); 1211 nfs_free_seqid(calldata->arg.seqid); 1212 nfs4_put_state_owner(sp); 1213 dput(calldata->path.dentry); 1214 mntput(calldata->path.mnt); 1215 kfree(calldata); 1216 } 1217 1218 static void nfs4_close_done(struct rpc_task *task, void *data) 1219 { 1220 struct nfs4_closedata *calldata = data; 1221 struct nfs4_state *state = calldata->state; 1222 struct nfs_server *server = NFS_SERVER(calldata->inode); 1223 1224 if (RPC_ASSASSINATED(task)) 1225 return; 1226 /* hmm. we are done with the inode, and in the process of freeing 1227 * the state_owner. we keep this around to process errors 1228 */ 1229 nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid); 1230 switch (task->tk_status) { 1231 case 0: 1232 nfs_set_open_stateid(state, &calldata->res.stateid, 0); 1233 renew_lease(server, calldata->timestamp); 1234 break; 1235 case -NFS4ERR_STALE_STATEID: 1236 case -NFS4ERR_EXPIRED: 1237 break; 1238 default: 1239 if (nfs4_async_handle_error(task, server) == -EAGAIN) { 1240 rpc_restart_call(task); 1241 return; 1242 } 1243 } 1244 nfs_refresh_inode(calldata->inode, calldata->res.fattr); 1245 } 1246 1247 static void nfs4_close_prepare(struct rpc_task *task, void *data) 1248 { 1249 struct nfs4_closedata *calldata = data; 1250 struct nfs4_state *state = calldata->state; 1251 int clear_rd, clear_wr, clear_rdwr; 1252 1253 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 1254 return; 1255 1256 clear_rd = clear_wr = clear_rdwr = 0; 1257 spin_lock(&state->owner->so_lock); 1258 /* Calculate the change in open mode */ 1259 if (state->n_rdwr == 0) { 1260 if (state->n_rdonly == 0) { 1261 clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1262 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags); 1263 } 1264 if (state->n_wronly == 0) { 1265 clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1266 clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags); 1267 } 1268 } 1269 spin_unlock(&state->owner->so_lock); 1270 if (!clear_rd && !clear_wr && !clear_rdwr) { 1271 /* Note: exit _without_ calling nfs4_close_done */ 1272 task->tk_action = NULL; 1273 return; 1274 } 1275 nfs_fattr_init(calldata->res.fattr); 1276 if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) { 1277 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 1278 calldata->arg.open_flags = FMODE_READ; 1279 } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) { 1280 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 1281 calldata->arg.open_flags = FMODE_WRITE; 1282 } 1283 calldata->timestamp = jiffies; 1284 rpc_call_start(task); 1285 } 1286 1287 static const struct rpc_call_ops nfs4_close_ops = { 1288 .rpc_call_prepare = nfs4_close_prepare, 1289 .rpc_call_done = nfs4_close_done, 1290 .rpc_release = nfs4_free_closedata, 1291 }; 1292 1293 /* 1294 * It is possible for data to be read/written from a mem-mapped file 1295 * after the sys_close call (which hits the vfs layer as a flush). 1296 * This means that we can't safely call nfsv4 close on a file until 1297 * the inode is cleared. This in turn means that we are not good 1298 * NFSv4 citizens - we do not indicate to the server to update the file's 1299 * share state even when we are done with one of the three share 1300 * stateid's in the inode. 1301 * 1302 * NOTE: Caller must be holding the sp->so_owner semaphore! 1303 */ 1304 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait) 1305 { 1306 struct nfs_server *server = NFS_SERVER(state->inode); 1307 struct nfs4_closedata *calldata; 1308 struct nfs4_state_owner *sp = state->owner; 1309 struct rpc_task *task; 1310 struct rpc_message msg = { 1311 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 1312 .rpc_cred = state->owner->so_cred, 1313 }; 1314 struct rpc_task_setup task_setup_data = { 1315 .rpc_client = server->client, 1316 .rpc_message = &msg, 1317 .callback_ops = &nfs4_close_ops, 1318 .flags = RPC_TASK_ASYNC, 1319 }; 1320 int status = -ENOMEM; 1321 1322 calldata = kmalloc(sizeof(*calldata), GFP_KERNEL); 1323 if (calldata == NULL) 1324 goto out; 1325 calldata->inode = state->inode; 1326 calldata->state = state; 1327 calldata->arg.fh = NFS_FH(state->inode); 1328 calldata->arg.stateid = &state->open_stateid; 1329 /* Serialization for the sequence id */ 1330 calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid); 1331 if (calldata->arg.seqid == NULL) 1332 goto out_free_calldata; 1333 calldata->arg.bitmask = server->attr_bitmask; 1334 calldata->res.fattr = &calldata->fattr; 1335 calldata->res.server = server; 1336 calldata->path.mnt = mntget(path->mnt); 1337 calldata->path.dentry = dget(path->dentry); 1338 1339 msg.rpc_argp = &calldata->arg, 1340 msg.rpc_resp = &calldata->res, 1341 task_setup_data.callback_data = calldata; 1342 task = rpc_run_task(&task_setup_data); 1343 if (IS_ERR(task)) 1344 return PTR_ERR(task); 1345 status = 0; 1346 if (wait) 1347 status = rpc_wait_for_completion_task(task); 1348 rpc_put_task(task); 1349 return status; 1350 out_free_calldata: 1351 kfree(calldata); 1352 out: 1353 nfs4_put_open_state(state); 1354 nfs4_put_state_owner(sp); 1355 return status; 1356 } 1357 1358 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state) 1359 { 1360 struct file *filp; 1361 int ret; 1362 1363 /* If the open_intent is for execute, we have an extra check to make */ 1364 if (nd->intent.open.flags & FMODE_EXEC) { 1365 ret = nfs_may_open(state->inode, 1366 state->owner->so_cred, 1367 nd->intent.open.flags); 1368 if (ret < 0) 1369 goto out_close; 1370 } 1371 filp = lookup_instantiate_filp(nd, path->dentry, NULL); 1372 if (!IS_ERR(filp)) { 1373 struct nfs_open_context *ctx; 1374 ctx = nfs_file_open_context(filp); 1375 ctx->state = state; 1376 return 0; 1377 } 1378 ret = PTR_ERR(filp); 1379 out_close: 1380 nfs4_close_sync(path, state, nd->intent.open.flags); 1381 return ret; 1382 } 1383 1384 struct dentry * 1385 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 1386 { 1387 struct path path = { 1388 .mnt = nd->path.mnt, 1389 .dentry = dentry, 1390 }; 1391 struct dentry *parent; 1392 struct iattr attr; 1393 struct rpc_cred *cred; 1394 struct nfs4_state *state; 1395 struct dentry *res; 1396 1397 if (nd->flags & LOOKUP_CREATE) { 1398 attr.ia_mode = nd->intent.open.create_mode; 1399 attr.ia_valid = ATTR_MODE; 1400 if (!IS_POSIXACL(dir)) 1401 attr.ia_mode &= ~current->fs->umask; 1402 } else { 1403 attr.ia_valid = 0; 1404 BUG_ON(nd->intent.open.flags & O_CREAT); 1405 } 1406 1407 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); 1408 if (IS_ERR(cred)) 1409 return (struct dentry *)cred; 1410 parent = dentry->d_parent; 1411 /* Protect against concurrent sillydeletes */ 1412 nfs_block_sillyrename(parent); 1413 state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred); 1414 put_rpccred(cred); 1415 if (IS_ERR(state)) { 1416 if (PTR_ERR(state) == -ENOENT) { 1417 d_add(dentry, NULL); 1418 nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 1419 } 1420 nfs_unblock_sillyrename(parent); 1421 return (struct dentry *)state; 1422 } 1423 res = d_add_unique(dentry, igrab(state->inode)); 1424 if (res != NULL) 1425 path.dentry = res; 1426 nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir)); 1427 nfs_unblock_sillyrename(parent); 1428 nfs4_intent_set_file(nd, &path, state); 1429 return res; 1430 } 1431 1432 int 1433 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd) 1434 { 1435 struct path path = { 1436 .mnt = nd->path.mnt, 1437 .dentry = dentry, 1438 }; 1439 struct rpc_cred *cred; 1440 struct nfs4_state *state; 1441 1442 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); 1443 if (IS_ERR(cred)) 1444 return PTR_ERR(cred); 1445 state = nfs4_do_open(dir, &path, openflags, NULL, cred); 1446 put_rpccred(cred); 1447 if (IS_ERR(state)) { 1448 switch (PTR_ERR(state)) { 1449 case -EPERM: 1450 case -EACCES: 1451 case -EDQUOT: 1452 case -ENOSPC: 1453 case -EROFS: 1454 lookup_instantiate_filp(nd, (struct dentry *)state, NULL); 1455 return 1; 1456 default: 1457 goto out_drop; 1458 } 1459 } 1460 if (state->inode == dentry->d_inode) { 1461 nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 1462 nfs4_intent_set_file(nd, &path, state); 1463 return 1; 1464 } 1465 nfs4_close_sync(&path, state, openflags); 1466 out_drop: 1467 d_drop(dentry); 1468 return 0; 1469 } 1470 1471 1472 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 1473 { 1474 struct nfs4_server_caps_res res = {}; 1475 struct rpc_message msg = { 1476 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 1477 .rpc_argp = fhandle, 1478 .rpc_resp = &res, 1479 }; 1480 int status; 1481 1482 status = rpc_call_sync(server->client, &msg, 0); 1483 if (status == 0) { 1484 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 1485 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) 1486 server->caps |= NFS_CAP_ACLS; 1487 if (res.has_links != 0) 1488 server->caps |= NFS_CAP_HARDLINKS; 1489 if (res.has_symlinks != 0) 1490 server->caps |= NFS_CAP_SYMLINKS; 1491 server->acl_bitmask = res.acl_bitmask; 1492 } 1493 return status; 1494 } 1495 1496 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 1497 { 1498 struct nfs4_exception exception = { }; 1499 int err; 1500 do { 1501 err = nfs4_handle_exception(server, 1502 _nfs4_server_capabilities(server, fhandle), 1503 &exception); 1504 } while (exception.retry); 1505 return err; 1506 } 1507 1508 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 1509 struct nfs_fsinfo *info) 1510 { 1511 struct nfs4_lookup_root_arg args = { 1512 .bitmask = nfs4_fattr_bitmap, 1513 }; 1514 struct nfs4_lookup_res res = { 1515 .server = server, 1516 .fattr = info->fattr, 1517 .fh = fhandle, 1518 }; 1519 struct rpc_message msg = { 1520 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 1521 .rpc_argp = &args, 1522 .rpc_resp = &res, 1523 }; 1524 nfs_fattr_init(info->fattr); 1525 return rpc_call_sync(server->client, &msg, 0); 1526 } 1527 1528 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 1529 struct nfs_fsinfo *info) 1530 { 1531 struct nfs4_exception exception = { }; 1532 int err; 1533 do { 1534 err = nfs4_handle_exception(server, 1535 _nfs4_lookup_root(server, fhandle, info), 1536 &exception); 1537 } while (exception.retry); 1538 return err; 1539 } 1540 1541 /* 1542 * get the file handle for the "/" directory on the server 1543 */ 1544 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, 1545 struct nfs_fsinfo *info) 1546 { 1547 int status; 1548 1549 status = nfs4_lookup_root(server, fhandle, info); 1550 if (status == 0) 1551 status = nfs4_server_capabilities(server, fhandle); 1552 if (status == 0) 1553 status = nfs4_do_fsinfo(server, fhandle, info); 1554 return nfs4_map_errors(status); 1555 } 1556 1557 /* 1558 * Get locations and (maybe) other attributes of a referral. 1559 * Note that we'll actually follow the referral later when 1560 * we detect fsid mismatch in inode revalidation 1561 */ 1562 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle) 1563 { 1564 int status = -ENOMEM; 1565 struct page *page = NULL; 1566 struct nfs4_fs_locations *locations = NULL; 1567 1568 page = alloc_page(GFP_KERNEL); 1569 if (page == NULL) 1570 goto out; 1571 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 1572 if (locations == NULL) 1573 goto out; 1574 1575 status = nfs4_proc_fs_locations(dir, name, locations, page); 1576 if (status != 0) 1577 goto out; 1578 /* Make sure server returned a different fsid for the referral */ 1579 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { 1580 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name); 1581 status = -EIO; 1582 goto out; 1583 } 1584 1585 memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); 1586 fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL; 1587 if (!fattr->mode) 1588 fattr->mode = S_IFDIR; 1589 memset(fhandle, 0, sizeof(struct nfs_fh)); 1590 out: 1591 if (page) 1592 __free_page(page); 1593 if (locations) 1594 kfree(locations); 1595 return status; 1596 } 1597 1598 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1599 { 1600 struct nfs4_getattr_arg args = { 1601 .fh = fhandle, 1602 .bitmask = server->attr_bitmask, 1603 }; 1604 struct nfs4_getattr_res res = { 1605 .fattr = fattr, 1606 .server = server, 1607 }; 1608 struct rpc_message msg = { 1609 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 1610 .rpc_argp = &args, 1611 .rpc_resp = &res, 1612 }; 1613 1614 nfs_fattr_init(fattr); 1615 return rpc_call_sync(server->client, &msg, 0); 1616 } 1617 1618 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1619 { 1620 struct nfs4_exception exception = { }; 1621 int err; 1622 do { 1623 err = nfs4_handle_exception(server, 1624 _nfs4_proc_getattr(server, fhandle, fattr), 1625 &exception); 1626 } while (exception.retry); 1627 return err; 1628 } 1629 1630 /* 1631 * The file is not closed if it is opened due to the a request to change 1632 * the size of the file. The open call will not be needed once the 1633 * VFS layer lookup-intents are implemented. 1634 * 1635 * Close is called when the inode is destroyed. 1636 * If we haven't opened the file for O_WRONLY, we 1637 * need to in the size_change case to obtain a stateid. 1638 * 1639 * Got race? 1640 * Because OPEN is always done by name in nfsv4, it is 1641 * possible that we opened a different file by the same 1642 * name. We can recognize this race condition, but we 1643 * can't do anything about it besides returning an error. 1644 * 1645 * This will be fixed with VFS changes (lookup-intent). 1646 */ 1647 static int 1648 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 1649 struct iattr *sattr) 1650 { 1651 struct rpc_cred *cred; 1652 struct inode *inode = dentry->d_inode; 1653 struct nfs_open_context *ctx; 1654 struct nfs4_state *state = NULL; 1655 int status; 1656 1657 nfs_fattr_init(fattr); 1658 1659 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); 1660 if (IS_ERR(cred)) 1661 return PTR_ERR(cred); 1662 1663 /* Search for an existing open(O_WRITE) file */ 1664 ctx = nfs_find_open_context(inode, cred, FMODE_WRITE); 1665 if (ctx != NULL) 1666 state = ctx->state; 1667 1668 status = nfs4_do_setattr(inode, fattr, sattr, state); 1669 if (status == 0) 1670 nfs_setattr_update_inode(inode, sattr); 1671 if (ctx != NULL) 1672 put_nfs_open_context(ctx); 1673 put_rpccred(cred); 1674 return status; 1675 } 1676 1677 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh, 1678 const struct qstr *name, struct nfs_fh *fhandle, 1679 struct nfs_fattr *fattr) 1680 { 1681 int status; 1682 struct nfs4_lookup_arg args = { 1683 .bitmask = server->attr_bitmask, 1684 .dir_fh = dirfh, 1685 .name = name, 1686 }; 1687 struct nfs4_lookup_res res = { 1688 .server = server, 1689 .fattr = fattr, 1690 .fh = fhandle, 1691 }; 1692 struct rpc_message msg = { 1693 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 1694 .rpc_argp = &args, 1695 .rpc_resp = &res, 1696 }; 1697 1698 nfs_fattr_init(fattr); 1699 1700 dprintk("NFS call lookupfh %s\n", name->name); 1701 status = rpc_call_sync(server->client, &msg, 0); 1702 dprintk("NFS reply lookupfh: %d\n", status); 1703 return status; 1704 } 1705 1706 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh, 1707 struct qstr *name, struct nfs_fh *fhandle, 1708 struct nfs_fattr *fattr) 1709 { 1710 struct nfs4_exception exception = { }; 1711 int err; 1712 do { 1713 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr); 1714 /* FIXME: !!!! */ 1715 if (err == -NFS4ERR_MOVED) { 1716 err = -EREMOTE; 1717 break; 1718 } 1719 err = nfs4_handle_exception(server, err, &exception); 1720 } while (exception.retry); 1721 return err; 1722 } 1723 1724 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, 1725 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1726 { 1727 int status; 1728 1729 dprintk("NFS call lookup %s\n", name->name); 1730 status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr); 1731 if (status == -NFS4ERR_MOVED) 1732 status = nfs4_get_referral(dir, name, fattr, fhandle); 1733 dprintk("NFS reply lookup: %d\n", status); 1734 return status; 1735 } 1736 1737 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr) 1738 { 1739 struct nfs4_exception exception = { }; 1740 int err; 1741 do { 1742 err = nfs4_handle_exception(NFS_SERVER(dir), 1743 _nfs4_proc_lookup(dir, name, fhandle, fattr), 1744 &exception); 1745 } while (exception.retry); 1746 return err; 1747 } 1748 1749 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 1750 { 1751 struct nfs_server *server = NFS_SERVER(inode); 1752 struct nfs_fattr fattr; 1753 struct nfs4_accessargs args = { 1754 .fh = NFS_FH(inode), 1755 .bitmask = server->attr_bitmask, 1756 }; 1757 struct nfs4_accessres res = { 1758 .server = server, 1759 .fattr = &fattr, 1760 }; 1761 struct rpc_message msg = { 1762 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 1763 .rpc_argp = &args, 1764 .rpc_resp = &res, 1765 .rpc_cred = entry->cred, 1766 }; 1767 int mode = entry->mask; 1768 int status; 1769 1770 /* 1771 * Determine which access bits we want to ask for... 1772 */ 1773 if (mode & MAY_READ) 1774 args.access |= NFS4_ACCESS_READ; 1775 if (S_ISDIR(inode->i_mode)) { 1776 if (mode & MAY_WRITE) 1777 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; 1778 if (mode & MAY_EXEC) 1779 args.access |= NFS4_ACCESS_LOOKUP; 1780 } else { 1781 if (mode & MAY_WRITE) 1782 args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; 1783 if (mode & MAY_EXEC) 1784 args.access |= NFS4_ACCESS_EXECUTE; 1785 } 1786 nfs_fattr_init(&fattr); 1787 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 1788 if (!status) { 1789 entry->mask = 0; 1790 if (res.access & NFS4_ACCESS_READ) 1791 entry->mask |= MAY_READ; 1792 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) 1793 entry->mask |= MAY_WRITE; 1794 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) 1795 entry->mask |= MAY_EXEC; 1796 nfs_refresh_inode(inode, &fattr); 1797 } 1798 return status; 1799 } 1800 1801 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) 1802 { 1803 struct nfs4_exception exception = { }; 1804 int err; 1805 do { 1806 err = nfs4_handle_exception(NFS_SERVER(inode), 1807 _nfs4_proc_access(inode, entry), 1808 &exception); 1809 } while (exception.retry); 1810 return err; 1811 } 1812 1813 /* 1814 * TODO: For the time being, we don't try to get any attributes 1815 * along with any of the zero-copy operations READ, READDIR, 1816 * READLINK, WRITE. 1817 * 1818 * In the case of the first three, we want to put the GETATTR 1819 * after the read-type operation -- this is because it is hard 1820 * to predict the length of a GETATTR response in v4, and thus 1821 * align the READ data correctly. This means that the GETATTR 1822 * may end up partially falling into the page cache, and we should 1823 * shift it into the 'tail' of the xdr_buf before processing. 1824 * To do this efficiently, we need to know the total length 1825 * of data received, which doesn't seem to be available outside 1826 * of the RPC layer. 1827 * 1828 * In the case of WRITE, we also want to put the GETATTR after 1829 * the operation -- in this case because we want to make sure 1830 * we get the post-operation mtime and size. This means that 1831 * we can't use xdr_encode_pages() as written: we need a variant 1832 * of it which would leave room in the 'tail' iovec. 1833 * 1834 * Both of these changes to the XDR layer would in fact be quite 1835 * minor, but I decided to leave them for a subsequent patch. 1836 */ 1837 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 1838 unsigned int pgbase, unsigned int pglen) 1839 { 1840 struct nfs4_readlink args = { 1841 .fh = NFS_FH(inode), 1842 .pgbase = pgbase, 1843 .pglen = pglen, 1844 .pages = &page, 1845 }; 1846 struct rpc_message msg = { 1847 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 1848 .rpc_argp = &args, 1849 .rpc_resp = NULL, 1850 }; 1851 1852 return rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 1853 } 1854 1855 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 1856 unsigned int pgbase, unsigned int pglen) 1857 { 1858 struct nfs4_exception exception = { }; 1859 int err; 1860 do { 1861 err = nfs4_handle_exception(NFS_SERVER(inode), 1862 _nfs4_proc_readlink(inode, page, pgbase, pglen), 1863 &exception); 1864 } while (exception.retry); 1865 return err; 1866 } 1867 1868 /* 1869 * Got race? 1870 * We will need to arrange for the VFS layer to provide an atomic open. 1871 * Until then, this create/open method is prone to inefficiency and race 1872 * conditions due to the lookup, create, and open VFS calls from sys_open() 1873 * placed on the wire. 1874 * 1875 * Given the above sorry state of affairs, I'm simply sending an OPEN. 1876 * The file will be opened again in the subsequent VFS open call 1877 * (nfs4_proc_file_open). 1878 * 1879 * The open for read will just hang around to be used by any process that 1880 * opens the file O_RDONLY. This will all be resolved with the VFS changes. 1881 */ 1882 1883 static int 1884 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 1885 int flags, struct nameidata *nd) 1886 { 1887 struct path path = { 1888 .mnt = nd->path.mnt, 1889 .dentry = dentry, 1890 }; 1891 struct nfs4_state *state; 1892 struct rpc_cred *cred; 1893 int status = 0; 1894 1895 cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); 1896 if (IS_ERR(cred)) { 1897 status = PTR_ERR(cred); 1898 goto out; 1899 } 1900 state = nfs4_do_open(dir, &path, flags, sattr, cred); 1901 put_rpccred(cred); 1902 d_drop(dentry); 1903 if (IS_ERR(state)) { 1904 status = PTR_ERR(state); 1905 goto out; 1906 } 1907 d_add(dentry, igrab(state->inode)); 1908 nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 1909 if (flags & O_EXCL) { 1910 struct nfs_fattr fattr; 1911 status = nfs4_do_setattr(state->inode, &fattr, sattr, state); 1912 if (status == 0) 1913 nfs_setattr_update_inode(state->inode, sattr); 1914 nfs_post_op_update_inode(state->inode, &fattr); 1915 } 1916 if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0) 1917 status = nfs4_intent_set_file(nd, &path, state); 1918 else 1919 nfs4_close_sync(&path, state, flags); 1920 out: 1921 return status; 1922 } 1923 1924 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) 1925 { 1926 struct nfs_server *server = NFS_SERVER(dir); 1927 struct nfs_removeargs args = { 1928 .fh = NFS_FH(dir), 1929 .name.len = name->len, 1930 .name.name = name->name, 1931 .bitmask = server->attr_bitmask, 1932 }; 1933 struct nfs_removeres res = { 1934 .server = server, 1935 }; 1936 struct rpc_message msg = { 1937 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 1938 .rpc_argp = &args, 1939 .rpc_resp = &res, 1940 }; 1941 int status; 1942 1943 nfs_fattr_init(&res.dir_attr); 1944 status = rpc_call_sync(server->client, &msg, 0); 1945 if (status == 0) { 1946 update_changeattr(dir, &res.cinfo); 1947 nfs_post_op_update_inode(dir, &res.dir_attr); 1948 } 1949 return status; 1950 } 1951 1952 static int nfs4_proc_remove(struct inode *dir, struct qstr *name) 1953 { 1954 struct nfs4_exception exception = { }; 1955 int err; 1956 do { 1957 err = nfs4_handle_exception(NFS_SERVER(dir), 1958 _nfs4_proc_remove(dir, name), 1959 &exception); 1960 } while (exception.retry); 1961 return err; 1962 } 1963 1964 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir) 1965 { 1966 struct nfs_server *server = NFS_SERVER(dir); 1967 struct nfs_removeargs *args = msg->rpc_argp; 1968 struct nfs_removeres *res = msg->rpc_resp; 1969 1970 args->bitmask = server->attr_bitmask; 1971 res->server = server; 1972 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 1973 } 1974 1975 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 1976 { 1977 struct nfs_removeres *res = task->tk_msg.rpc_resp; 1978 1979 if (nfs4_async_handle_error(task, res->server) == -EAGAIN) 1980 return 0; 1981 update_changeattr(dir, &res->cinfo); 1982 nfs_post_op_update_inode(dir, &res->dir_attr); 1983 return 1; 1984 } 1985 1986 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 1987 struct inode *new_dir, struct qstr *new_name) 1988 { 1989 struct nfs_server *server = NFS_SERVER(old_dir); 1990 struct nfs4_rename_arg arg = { 1991 .old_dir = NFS_FH(old_dir), 1992 .new_dir = NFS_FH(new_dir), 1993 .old_name = old_name, 1994 .new_name = new_name, 1995 .bitmask = server->attr_bitmask, 1996 }; 1997 struct nfs_fattr old_fattr, new_fattr; 1998 struct nfs4_rename_res res = { 1999 .server = server, 2000 .old_fattr = &old_fattr, 2001 .new_fattr = &new_fattr, 2002 }; 2003 struct rpc_message msg = { 2004 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME], 2005 .rpc_argp = &arg, 2006 .rpc_resp = &res, 2007 }; 2008 int status; 2009 2010 nfs_fattr_init(res.old_fattr); 2011 nfs_fattr_init(res.new_fattr); 2012 status = rpc_call_sync(server->client, &msg, 0); 2013 2014 if (!status) { 2015 update_changeattr(old_dir, &res.old_cinfo); 2016 nfs_post_op_update_inode(old_dir, res.old_fattr); 2017 update_changeattr(new_dir, &res.new_cinfo); 2018 nfs_post_op_update_inode(new_dir, res.new_fattr); 2019 } 2020 return status; 2021 } 2022 2023 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, 2024 struct inode *new_dir, struct qstr *new_name) 2025 { 2026 struct nfs4_exception exception = { }; 2027 int err; 2028 do { 2029 err = nfs4_handle_exception(NFS_SERVER(old_dir), 2030 _nfs4_proc_rename(old_dir, old_name, 2031 new_dir, new_name), 2032 &exception); 2033 } while (exception.retry); 2034 return err; 2035 } 2036 2037 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 2038 { 2039 struct nfs_server *server = NFS_SERVER(inode); 2040 struct nfs4_link_arg arg = { 2041 .fh = NFS_FH(inode), 2042 .dir_fh = NFS_FH(dir), 2043 .name = name, 2044 .bitmask = server->attr_bitmask, 2045 }; 2046 struct nfs_fattr fattr, dir_attr; 2047 struct nfs4_link_res res = { 2048 .server = server, 2049 .fattr = &fattr, 2050 .dir_attr = &dir_attr, 2051 }; 2052 struct rpc_message msg = { 2053 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 2054 .rpc_argp = &arg, 2055 .rpc_resp = &res, 2056 }; 2057 int status; 2058 2059 nfs_fattr_init(res.fattr); 2060 nfs_fattr_init(res.dir_attr); 2061 status = rpc_call_sync(server->client, &msg, 0); 2062 if (!status) { 2063 update_changeattr(dir, &res.cinfo); 2064 nfs_post_op_update_inode(dir, res.dir_attr); 2065 nfs_post_op_update_inode(inode, res.fattr); 2066 } 2067 2068 return status; 2069 } 2070 2071 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) 2072 { 2073 struct nfs4_exception exception = { }; 2074 int err; 2075 do { 2076 err = nfs4_handle_exception(NFS_SERVER(inode), 2077 _nfs4_proc_link(inode, dir, name), 2078 &exception); 2079 } while (exception.retry); 2080 return err; 2081 } 2082 2083 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 2084 struct page *page, unsigned int len, struct iattr *sattr) 2085 { 2086 struct nfs_server *server = NFS_SERVER(dir); 2087 struct nfs_fh fhandle; 2088 struct nfs_fattr fattr, dir_fattr; 2089 struct nfs4_create_arg arg = { 2090 .dir_fh = NFS_FH(dir), 2091 .server = server, 2092 .name = &dentry->d_name, 2093 .attrs = sattr, 2094 .ftype = NF4LNK, 2095 .bitmask = server->attr_bitmask, 2096 }; 2097 struct nfs4_create_res res = { 2098 .server = server, 2099 .fh = &fhandle, 2100 .fattr = &fattr, 2101 .dir_fattr = &dir_fattr, 2102 }; 2103 struct rpc_message msg = { 2104 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK], 2105 .rpc_argp = &arg, 2106 .rpc_resp = &res, 2107 }; 2108 int status; 2109 2110 if (len > NFS4_MAXPATHLEN) 2111 return -ENAMETOOLONG; 2112 2113 arg.u.symlink.pages = &page; 2114 arg.u.symlink.len = len; 2115 nfs_fattr_init(&fattr); 2116 nfs_fattr_init(&dir_fattr); 2117 2118 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 2119 if (!status) { 2120 update_changeattr(dir, &res.dir_cinfo); 2121 nfs_post_op_update_inode(dir, res.dir_fattr); 2122 status = nfs_instantiate(dentry, &fhandle, &fattr); 2123 } 2124 return status; 2125 } 2126 2127 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 2128 struct page *page, unsigned int len, struct iattr *sattr) 2129 { 2130 struct nfs4_exception exception = { }; 2131 int err; 2132 do { 2133 err = nfs4_handle_exception(NFS_SERVER(dir), 2134 _nfs4_proc_symlink(dir, dentry, page, 2135 len, sattr), 2136 &exception); 2137 } while (exception.retry); 2138 return err; 2139 } 2140 2141 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 2142 struct iattr *sattr) 2143 { 2144 struct nfs_server *server = NFS_SERVER(dir); 2145 struct nfs_fh fhandle; 2146 struct nfs_fattr fattr, dir_fattr; 2147 struct nfs4_create_arg arg = { 2148 .dir_fh = NFS_FH(dir), 2149 .server = server, 2150 .name = &dentry->d_name, 2151 .attrs = sattr, 2152 .ftype = NF4DIR, 2153 .bitmask = server->attr_bitmask, 2154 }; 2155 struct nfs4_create_res res = { 2156 .server = server, 2157 .fh = &fhandle, 2158 .fattr = &fattr, 2159 .dir_fattr = &dir_fattr, 2160 }; 2161 struct rpc_message msg = { 2162 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], 2163 .rpc_argp = &arg, 2164 .rpc_resp = &res, 2165 }; 2166 int status; 2167 2168 nfs_fattr_init(&fattr); 2169 nfs_fattr_init(&dir_fattr); 2170 2171 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 2172 if (!status) { 2173 update_changeattr(dir, &res.dir_cinfo); 2174 nfs_post_op_update_inode(dir, res.dir_fattr); 2175 status = nfs_instantiate(dentry, &fhandle, &fattr); 2176 } 2177 return status; 2178 } 2179 2180 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 2181 struct iattr *sattr) 2182 { 2183 struct nfs4_exception exception = { }; 2184 int err; 2185 do { 2186 err = nfs4_handle_exception(NFS_SERVER(dir), 2187 _nfs4_proc_mkdir(dir, dentry, sattr), 2188 &exception); 2189 } while (exception.retry); 2190 return err; 2191 } 2192 2193 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 2194 u64 cookie, struct page *page, unsigned int count, int plus) 2195 { 2196 struct inode *dir = dentry->d_inode; 2197 struct nfs4_readdir_arg args = { 2198 .fh = NFS_FH(dir), 2199 .pages = &page, 2200 .pgbase = 0, 2201 .count = count, 2202 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, 2203 }; 2204 struct nfs4_readdir_res res; 2205 struct rpc_message msg = { 2206 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 2207 .rpc_argp = &args, 2208 .rpc_resp = &res, 2209 .rpc_cred = cred, 2210 }; 2211 int status; 2212 2213 dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__, 2214 dentry->d_parent->d_name.name, 2215 dentry->d_name.name, 2216 (unsigned long long)cookie); 2217 nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args); 2218 res.pgbase = args.pgbase; 2219 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 2220 if (status == 0) 2221 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE); 2222 2223 nfs_invalidate_atime(dir); 2224 2225 dprintk("%s: returns %d\n", __FUNCTION__, status); 2226 return status; 2227 } 2228 2229 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, 2230 u64 cookie, struct page *page, unsigned int count, int plus) 2231 { 2232 struct nfs4_exception exception = { }; 2233 int err; 2234 do { 2235 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), 2236 _nfs4_proc_readdir(dentry, cred, cookie, 2237 page, count, plus), 2238 &exception); 2239 } while (exception.retry); 2240 return err; 2241 } 2242 2243 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 2244 struct iattr *sattr, dev_t rdev) 2245 { 2246 struct nfs_server *server = NFS_SERVER(dir); 2247 struct nfs_fh fh; 2248 struct nfs_fattr fattr, dir_fattr; 2249 struct nfs4_create_arg arg = { 2250 .dir_fh = NFS_FH(dir), 2251 .server = server, 2252 .name = &dentry->d_name, 2253 .attrs = sattr, 2254 .bitmask = server->attr_bitmask, 2255 }; 2256 struct nfs4_create_res res = { 2257 .server = server, 2258 .fh = &fh, 2259 .fattr = &fattr, 2260 .dir_fattr = &dir_fattr, 2261 }; 2262 struct rpc_message msg = { 2263 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], 2264 .rpc_argp = &arg, 2265 .rpc_resp = &res, 2266 }; 2267 int status; 2268 int mode = sattr->ia_mode; 2269 2270 nfs_fattr_init(&fattr); 2271 nfs_fattr_init(&dir_fattr); 2272 2273 BUG_ON(!(sattr->ia_valid & ATTR_MODE)); 2274 BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode)); 2275 if (S_ISFIFO(mode)) 2276 arg.ftype = NF4FIFO; 2277 else if (S_ISBLK(mode)) { 2278 arg.ftype = NF4BLK; 2279 arg.u.device.specdata1 = MAJOR(rdev); 2280 arg.u.device.specdata2 = MINOR(rdev); 2281 } 2282 else if (S_ISCHR(mode)) { 2283 arg.ftype = NF4CHR; 2284 arg.u.device.specdata1 = MAJOR(rdev); 2285 arg.u.device.specdata2 = MINOR(rdev); 2286 } 2287 else 2288 arg.ftype = NF4SOCK; 2289 2290 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); 2291 if (status == 0) { 2292 update_changeattr(dir, &res.dir_cinfo); 2293 nfs_post_op_update_inode(dir, res.dir_fattr); 2294 status = nfs_instantiate(dentry, &fh, &fattr); 2295 } 2296 return status; 2297 } 2298 2299 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 2300 struct iattr *sattr, dev_t rdev) 2301 { 2302 struct nfs4_exception exception = { }; 2303 int err; 2304 do { 2305 err = nfs4_handle_exception(NFS_SERVER(dir), 2306 _nfs4_proc_mknod(dir, dentry, sattr, rdev), 2307 &exception); 2308 } while (exception.retry); 2309 return err; 2310 } 2311 2312 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 2313 struct nfs_fsstat *fsstat) 2314 { 2315 struct nfs4_statfs_arg args = { 2316 .fh = fhandle, 2317 .bitmask = server->attr_bitmask, 2318 }; 2319 struct rpc_message msg = { 2320 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 2321 .rpc_argp = &args, 2322 .rpc_resp = fsstat, 2323 }; 2324 2325 nfs_fattr_init(fsstat->fattr); 2326 return rpc_call_sync(server->client, &msg, 0); 2327 } 2328 2329 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 2330 { 2331 struct nfs4_exception exception = { }; 2332 int err; 2333 do { 2334 err = nfs4_handle_exception(server, 2335 _nfs4_proc_statfs(server, fhandle, fsstat), 2336 &exception); 2337 } while (exception.retry); 2338 return err; 2339 } 2340 2341 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 2342 struct nfs_fsinfo *fsinfo) 2343 { 2344 struct nfs4_fsinfo_arg args = { 2345 .fh = fhandle, 2346 .bitmask = server->attr_bitmask, 2347 }; 2348 struct rpc_message msg = { 2349 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 2350 .rpc_argp = &args, 2351 .rpc_resp = fsinfo, 2352 }; 2353 2354 return rpc_call_sync(server->client, &msg, 0); 2355 } 2356 2357 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 2358 { 2359 struct nfs4_exception exception = { }; 2360 int err; 2361 2362 do { 2363 err = nfs4_handle_exception(server, 2364 _nfs4_do_fsinfo(server, fhandle, fsinfo), 2365 &exception); 2366 } while (exception.retry); 2367 return err; 2368 } 2369 2370 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 2371 { 2372 nfs_fattr_init(fsinfo->fattr); 2373 return nfs4_do_fsinfo(server, fhandle, fsinfo); 2374 } 2375 2376 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 2377 struct nfs_pathconf *pathconf) 2378 { 2379 struct nfs4_pathconf_arg args = { 2380 .fh = fhandle, 2381 .bitmask = server->attr_bitmask, 2382 }; 2383 struct rpc_message msg = { 2384 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 2385 .rpc_argp = &args, 2386 .rpc_resp = pathconf, 2387 }; 2388 2389 /* None of the pathconf attributes are mandatory to implement */ 2390 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 2391 memset(pathconf, 0, sizeof(*pathconf)); 2392 return 0; 2393 } 2394 2395 nfs_fattr_init(pathconf->fattr); 2396 return rpc_call_sync(server->client, &msg, 0); 2397 } 2398 2399 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 2400 struct nfs_pathconf *pathconf) 2401 { 2402 struct nfs4_exception exception = { }; 2403 int err; 2404 2405 do { 2406 err = nfs4_handle_exception(server, 2407 _nfs4_proc_pathconf(server, fhandle, pathconf), 2408 &exception); 2409 } while (exception.retry); 2410 return err; 2411 } 2412 2413 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data) 2414 { 2415 struct nfs_server *server = NFS_SERVER(data->inode); 2416 2417 if (nfs4_async_handle_error(task, server) == -EAGAIN) { 2418 rpc_restart_call(task); 2419 return -EAGAIN; 2420 } 2421 2422 nfs_invalidate_atime(data->inode); 2423 if (task->tk_status > 0) 2424 renew_lease(server, data->timestamp); 2425 return 0; 2426 } 2427 2428 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg) 2429 { 2430 data->timestamp = jiffies; 2431 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 2432 } 2433 2434 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) 2435 { 2436 struct inode *inode = data->inode; 2437 2438 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { 2439 rpc_restart_call(task); 2440 return -EAGAIN; 2441 } 2442 if (task->tk_status >= 0) { 2443 renew_lease(NFS_SERVER(inode), data->timestamp); 2444 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr); 2445 } 2446 return 0; 2447 } 2448 2449 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg) 2450 { 2451 struct nfs_server *server = NFS_SERVER(data->inode); 2452 2453 data->args.bitmask = server->attr_bitmask; 2454 data->res.server = server; 2455 data->timestamp = jiffies; 2456 2457 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 2458 } 2459 2460 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data) 2461 { 2462 struct inode *inode = data->inode; 2463 2464 if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { 2465 rpc_restart_call(task); 2466 return -EAGAIN; 2467 } 2468 nfs_refresh_inode(inode, data->res.fattr); 2469 return 0; 2470 } 2471 2472 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg) 2473 { 2474 struct nfs_server *server = NFS_SERVER(data->inode); 2475 2476 data->args.bitmask = server->attr_bitmask; 2477 data->res.server = server; 2478 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 2479 } 2480 2481 /* 2482 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 2483 * standalone procedure for queueing an asynchronous RENEW. 2484 */ 2485 static void nfs4_renew_done(struct rpc_task *task, void *data) 2486 { 2487 struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp; 2488 unsigned long timestamp = (unsigned long)data; 2489 2490 if (task->tk_status < 0) { 2491 switch (task->tk_status) { 2492 case -NFS4ERR_STALE_CLIENTID: 2493 case -NFS4ERR_EXPIRED: 2494 case -NFS4ERR_CB_PATH_DOWN: 2495 nfs4_schedule_state_recovery(clp); 2496 } 2497 return; 2498 } 2499 spin_lock(&clp->cl_lock); 2500 if (time_before(clp->cl_last_renewal,timestamp)) 2501 clp->cl_last_renewal = timestamp; 2502 spin_unlock(&clp->cl_lock); 2503 } 2504 2505 static const struct rpc_call_ops nfs4_renew_ops = { 2506 .rpc_call_done = nfs4_renew_done, 2507 }; 2508 2509 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred) 2510 { 2511 struct rpc_message msg = { 2512 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 2513 .rpc_argp = clp, 2514 .rpc_cred = cred, 2515 }; 2516 2517 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, 2518 &nfs4_renew_ops, (void *)jiffies); 2519 } 2520 2521 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) 2522 { 2523 struct rpc_message msg = { 2524 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 2525 .rpc_argp = clp, 2526 .rpc_cred = cred, 2527 }; 2528 unsigned long now = jiffies; 2529 int status; 2530 2531 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2532 if (status < 0) 2533 return status; 2534 spin_lock(&clp->cl_lock); 2535 if (time_before(clp->cl_last_renewal,now)) 2536 clp->cl_last_renewal = now; 2537 spin_unlock(&clp->cl_lock); 2538 return 0; 2539 } 2540 2541 static inline int nfs4_server_supports_acls(struct nfs_server *server) 2542 { 2543 return (server->caps & NFS_CAP_ACLS) 2544 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 2545 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL); 2546 } 2547 2548 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that 2549 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on 2550 * the stack. 2551 */ 2552 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT) 2553 2554 static void buf_to_pages(const void *buf, size_t buflen, 2555 struct page **pages, unsigned int *pgbase) 2556 { 2557 const void *p = buf; 2558 2559 *pgbase = offset_in_page(buf); 2560 p -= *pgbase; 2561 while (p < buf + buflen) { 2562 *(pages++) = virt_to_page(p); 2563 p += PAGE_CACHE_SIZE; 2564 } 2565 } 2566 2567 struct nfs4_cached_acl { 2568 int cached; 2569 size_t len; 2570 char data[0]; 2571 }; 2572 2573 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 2574 { 2575 struct nfs_inode *nfsi = NFS_I(inode); 2576 2577 spin_lock(&inode->i_lock); 2578 kfree(nfsi->nfs4_acl); 2579 nfsi->nfs4_acl = acl; 2580 spin_unlock(&inode->i_lock); 2581 } 2582 2583 static void nfs4_zap_acl_attr(struct inode *inode) 2584 { 2585 nfs4_set_cached_acl(inode, NULL); 2586 } 2587 2588 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) 2589 { 2590 struct nfs_inode *nfsi = NFS_I(inode); 2591 struct nfs4_cached_acl *acl; 2592 int ret = -ENOENT; 2593 2594 spin_lock(&inode->i_lock); 2595 acl = nfsi->nfs4_acl; 2596 if (acl == NULL) 2597 goto out; 2598 if (buf == NULL) /* user is just asking for length */ 2599 goto out_len; 2600 if (acl->cached == 0) 2601 goto out; 2602 ret = -ERANGE; /* see getxattr(2) man page */ 2603 if (acl->len > buflen) 2604 goto out; 2605 memcpy(buf, acl->data, acl->len); 2606 out_len: 2607 ret = acl->len; 2608 out: 2609 spin_unlock(&inode->i_lock); 2610 return ret; 2611 } 2612 2613 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len) 2614 { 2615 struct nfs4_cached_acl *acl; 2616 2617 if (buf && acl_len <= PAGE_SIZE) { 2618 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL); 2619 if (acl == NULL) 2620 goto out; 2621 acl->cached = 1; 2622 memcpy(acl->data, buf, acl_len); 2623 } else { 2624 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 2625 if (acl == NULL) 2626 goto out; 2627 acl->cached = 0; 2628 } 2629 acl->len = acl_len; 2630 out: 2631 nfs4_set_cached_acl(inode, acl); 2632 } 2633 2634 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 2635 { 2636 struct page *pages[NFS4ACL_MAXPAGES]; 2637 struct nfs_getaclargs args = { 2638 .fh = NFS_FH(inode), 2639 .acl_pages = pages, 2640 .acl_len = buflen, 2641 }; 2642 size_t resp_len = buflen; 2643 void *resp_buf; 2644 struct rpc_message msg = { 2645 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 2646 .rpc_argp = &args, 2647 .rpc_resp = &resp_len, 2648 }; 2649 struct page *localpage = NULL; 2650 int ret; 2651 2652 if (buflen < PAGE_SIZE) { 2653 /* As long as we're doing a round trip to the server anyway, 2654 * let's be prepared for a page of acl data. */ 2655 localpage = alloc_page(GFP_KERNEL); 2656 resp_buf = page_address(localpage); 2657 if (localpage == NULL) 2658 return -ENOMEM; 2659 args.acl_pages[0] = localpage; 2660 args.acl_pgbase = 0; 2661 resp_len = args.acl_len = PAGE_SIZE; 2662 } else { 2663 resp_buf = buf; 2664 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase); 2665 } 2666 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 2667 if (ret) 2668 goto out_free; 2669 if (resp_len > args.acl_len) 2670 nfs4_write_cached_acl(inode, NULL, resp_len); 2671 else 2672 nfs4_write_cached_acl(inode, resp_buf, resp_len); 2673 if (buf) { 2674 ret = -ERANGE; 2675 if (resp_len > buflen) 2676 goto out_free; 2677 if (localpage) 2678 memcpy(buf, resp_buf, resp_len); 2679 } 2680 ret = resp_len; 2681 out_free: 2682 if (localpage) 2683 __free_page(localpage); 2684 return ret; 2685 } 2686 2687 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) 2688 { 2689 struct nfs4_exception exception = { }; 2690 ssize_t ret; 2691 do { 2692 ret = __nfs4_get_acl_uncached(inode, buf, buflen); 2693 if (ret >= 0) 2694 break; 2695 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 2696 } while (exception.retry); 2697 return ret; 2698 } 2699 2700 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) 2701 { 2702 struct nfs_server *server = NFS_SERVER(inode); 2703 int ret; 2704 2705 if (!nfs4_server_supports_acls(server)) 2706 return -EOPNOTSUPP; 2707 ret = nfs_revalidate_inode(server, inode); 2708 if (ret < 0) 2709 return ret; 2710 ret = nfs4_read_cached_acl(inode, buf, buflen); 2711 if (ret != -ENOENT) 2712 return ret; 2713 return nfs4_get_acl_uncached(inode, buf, buflen); 2714 } 2715 2716 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 2717 { 2718 struct nfs_server *server = NFS_SERVER(inode); 2719 struct page *pages[NFS4ACL_MAXPAGES]; 2720 struct nfs_setaclargs arg = { 2721 .fh = NFS_FH(inode), 2722 .acl_pages = pages, 2723 .acl_len = buflen, 2724 }; 2725 struct rpc_message msg = { 2726 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 2727 .rpc_argp = &arg, 2728 .rpc_resp = NULL, 2729 }; 2730 int ret; 2731 2732 if (!nfs4_server_supports_acls(server)) 2733 return -EOPNOTSUPP; 2734 nfs_inode_return_delegation(inode); 2735 buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase); 2736 ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); 2737 nfs_zap_caches(inode); 2738 return ret; 2739 } 2740 2741 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) 2742 { 2743 struct nfs4_exception exception = { }; 2744 int err; 2745 do { 2746 err = nfs4_handle_exception(NFS_SERVER(inode), 2747 __nfs4_proc_set_acl(inode, buf, buflen), 2748 &exception); 2749 } while (exception.retry); 2750 return err; 2751 } 2752 2753 static int 2754 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server) 2755 { 2756 struct nfs_client *clp = server->nfs_client; 2757 2758 if (!clp || task->tk_status >= 0) 2759 return 0; 2760 switch(task->tk_status) { 2761 case -NFS4ERR_STALE_CLIENTID: 2762 case -NFS4ERR_STALE_STATEID: 2763 case -NFS4ERR_EXPIRED: 2764 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL); 2765 nfs4_schedule_state_recovery(clp); 2766 if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) 2767 rpc_wake_up_task(task); 2768 task->tk_status = 0; 2769 return -EAGAIN; 2770 case -NFS4ERR_DELAY: 2771 nfs_inc_server_stats((struct nfs_server *) server, 2772 NFSIOS_DELAY); 2773 case -NFS4ERR_GRACE: 2774 rpc_delay(task, NFS4_POLL_RETRY_MAX); 2775 task->tk_status = 0; 2776 return -EAGAIN; 2777 case -NFS4ERR_OLD_STATEID: 2778 task->tk_status = 0; 2779 return -EAGAIN; 2780 } 2781 task->tk_status = nfs4_map_errors(task->tk_status); 2782 return 0; 2783 } 2784 2785 static int nfs4_wait_bit_killable(void *word) 2786 { 2787 if (fatal_signal_pending(current)) 2788 return -ERESTARTSYS; 2789 schedule(); 2790 return 0; 2791 } 2792 2793 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp) 2794 { 2795 int res; 2796 2797 might_sleep(); 2798 2799 rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_); 2800 2801 res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER, 2802 nfs4_wait_bit_killable, TASK_KILLABLE); 2803 2804 rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_); 2805 return res; 2806 } 2807 2808 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) 2809 { 2810 int res = 0; 2811 2812 might_sleep(); 2813 2814 if (*timeout <= 0) 2815 *timeout = NFS4_POLL_RETRY_MIN; 2816 if (*timeout > NFS4_POLL_RETRY_MAX) 2817 *timeout = NFS4_POLL_RETRY_MAX; 2818 schedule_timeout_killable(*timeout); 2819 if (fatal_signal_pending(current)) 2820 res = -ERESTARTSYS; 2821 *timeout <<= 1; 2822 return res; 2823 } 2824 2825 /* This is the error handling routine for processes that are allowed 2826 * to sleep. 2827 */ 2828 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 2829 { 2830 struct nfs_client *clp = server->nfs_client; 2831 int ret = errorcode; 2832 2833 exception->retry = 0; 2834 switch(errorcode) { 2835 case 0: 2836 return 0; 2837 case -NFS4ERR_STALE_CLIENTID: 2838 case -NFS4ERR_STALE_STATEID: 2839 case -NFS4ERR_EXPIRED: 2840 nfs4_schedule_state_recovery(clp); 2841 ret = nfs4_wait_clnt_recover(server->client, clp); 2842 if (ret == 0) 2843 exception->retry = 1; 2844 break; 2845 case -NFS4ERR_FILE_OPEN: 2846 case -NFS4ERR_GRACE: 2847 case -NFS4ERR_DELAY: 2848 ret = nfs4_delay(server->client, &exception->timeout); 2849 if (ret != 0) 2850 break; 2851 case -NFS4ERR_OLD_STATEID: 2852 exception->retry = 1; 2853 } 2854 /* We failed to handle the error */ 2855 return nfs4_map_errors(ret); 2856 } 2857 2858 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred) 2859 { 2860 nfs4_verifier sc_verifier; 2861 struct nfs4_setclientid setclientid = { 2862 .sc_verifier = &sc_verifier, 2863 .sc_prog = program, 2864 }; 2865 struct rpc_message msg = { 2866 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 2867 .rpc_argp = &setclientid, 2868 .rpc_resp = clp, 2869 .rpc_cred = cred, 2870 }; 2871 __be32 *p; 2872 int loop = 0; 2873 int status; 2874 2875 p = (__be32*)sc_verifier.data; 2876 *p++ = htonl((u32)clp->cl_boot_time.tv_sec); 2877 *p = htonl((u32)clp->cl_boot_time.tv_nsec); 2878 2879 for(;;) { 2880 setclientid.sc_name_len = scnprintf(setclientid.sc_name, 2881 sizeof(setclientid.sc_name), "%s/%s %s %s %u", 2882 clp->cl_ipaddr, 2883 rpc_peeraddr2str(clp->cl_rpcclient, 2884 RPC_DISPLAY_ADDR), 2885 rpc_peeraddr2str(clp->cl_rpcclient, 2886 RPC_DISPLAY_PROTO), 2887 cred->cr_ops->cr_name, 2888 clp->cl_id_uniquifier); 2889 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid, 2890 sizeof(setclientid.sc_netid), 2891 rpc_peeraddr2str(clp->cl_rpcclient, 2892 RPC_DISPLAY_NETID)); 2893 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 2894 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 2895 clp->cl_ipaddr, port >> 8, port & 255); 2896 2897 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2898 if (status != -NFS4ERR_CLID_INUSE) 2899 break; 2900 if (signalled()) 2901 break; 2902 if (loop++ & 1) 2903 ssleep(clp->cl_lease_time + 1); 2904 else 2905 if (++clp->cl_id_uniquifier == 0) 2906 break; 2907 } 2908 return status; 2909 } 2910 2911 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred) 2912 { 2913 struct nfs_fsinfo fsinfo; 2914 struct rpc_message msg = { 2915 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 2916 .rpc_argp = clp, 2917 .rpc_resp = &fsinfo, 2918 .rpc_cred = cred, 2919 }; 2920 unsigned long now; 2921 int status; 2922 2923 now = jiffies; 2924 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); 2925 if (status == 0) { 2926 spin_lock(&clp->cl_lock); 2927 clp->cl_lease_time = fsinfo.lease_time * HZ; 2928 clp->cl_last_renewal = now; 2929 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); 2930 spin_unlock(&clp->cl_lock); 2931 } 2932 return status; 2933 } 2934 2935 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred) 2936 { 2937 long timeout; 2938 int err; 2939 do { 2940 err = _nfs4_proc_setclientid_confirm(clp, cred); 2941 switch (err) { 2942 case 0: 2943 return err; 2944 case -NFS4ERR_RESOURCE: 2945 /* The IBM lawyers misread another document! */ 2946 case -NFS4ERR_DELAY: 2947 err = nfs4_delay(clp->cl_rpcclient, &timeout); 2948 } 2949 } while (err == 0); 2950 return err; 2951 } 2952 2953 struct nfs4_delegreturndata { 2954 struct nfs4_delegreturnargs args; 2955 struct nfs4_delegreturnres res; 2956 struct nfs_fh fh; 2957 nfs4_stateid stateid; 2958 unsigned long timestamp; 2959 struct nfs_fattr fattr; 2960 int rpc_status; 2961 }; 2962 2963 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 2964 { 2965 struct nfs4_delegreturndata *data = calldata; 2966 data->rpc_status = task->tk_status; 2967 if (data->rpc_status == 0) 2968 renew_lease(data->res.server, data->timestamp); 2969 } 2970 2971 static void nfs4_delegreturn_release(void *calldata) 2972 { 2973 kfree(calldata); 2974 } 2975 2976 static const struct rpc_call_ops nfs4_delegreturn_ops = { 2977 .rpc_call_done = nfs4_delegreturn_done, 2978 .rpc_release = nfs4_delegreturn_release, 2979 }; 2980 2981 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 2982 { 2983 struct nfs4_delegreturndata *data; 2984 struct nfs_server *server = NFS_SERVER(inode); 2985 struct rpc_task *task; 2986 struct rpc_message msg = { 2987 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 2988 .rpc_cred = cred, 2989 }; 2990 struct rpc_task_setup task_setup_data = { 2991 .rpc_client = server->client, 2992 .rpc_message = &msg, 2993 .callback_ops = &nfs4_delegreturn_ops, 2994 .flags = RPC_TASK_ASYNC, 2995 }; 2996 int status = 0; 2997 2998 data = kmalloc(sizeof(*data), GFP_KERNEL); 2999 if (data == NULL) 3000 return -ENOMEM; 3001 data->args.fhandle = &data->fh; 3002 data->args.stateid = &data->stateid; 3003 data->args.bitmask = server->attr_bitmask; 3004 nfs_copy_fh(&data->fh, NFS_FH(inode)); 3005 memcpy(&data->stateid, stateid, sizeof(data->stateid)); 3006 data->res.fattr = &data->fattr; 3007 data->res.server = server; 3008 nfs_fattr_init(data->res.fattr); 3009 data->timestamp = jiffies; 3010 data->rpc_status = 0; 3011 3012 task_setup_data.callback_data = data; 3013 msg.rpc_argp = &data->args, 3014 msg.rpc_resp = &data->res, 3015 task = rpc_run_task(&task_setup_data); 3016 if (IS_ERR(task)) 3017 return PTR_ERR(task); 3018 if (!issync) 3019 goto out; 3020 status = nfs4_wait_for_completion_rpc_task(task); 3021 if (status != 0) 3022 goto out; 3023 status = data->rpc_status; 3024 if (status != 0) 3025 goto out; 3026 nfs_refresh_inode(inode, &data->fattr); 3027 out: 3028 rpc_put_task(task); 3029 return status; 3030 } 3031 3032 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync) 3033 { 3034 struct nfs_server *server = NFS_SERVER(inode); 3035 struct nfs4_exception exception = { }; 3036 int err; 3037 do { 3038 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 3039 switch (err) { 3040 case -NFS4ERR_STALE_STATEID: 3041 case -NFS4ERR_EXPIRED: 3042 case 0: 3043 return 0; 3044 } 3045 err = nfs4_handle_exception(server, err, &exception); 3046 } while (exception.retry); 3047 return err; 3048 } 3049 3050 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 3051 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 3052 3053 /* 3054 * sleep, with exponential backoff, and retry the LOCK operation. 3055 */ 3056 static unsigned long 3057 nfs4_set_lock_task_retry(unsigned long timeout) 3058 { 3059 schedule_timeout_killable(timeout); 3060 timeout <<= 1; 3061 if (timeout > NFS4_LOCK_MAXTIMEOUT) 3062 return NFS4_LOCK_MAXTIMEOUT; 3063 return timeout; 3064 } 3065 3066 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3067 { 3068 struct inode *inode = state->inode; 3069 struct nfs_server *server = NFS_SERVER(inode); 3070 struct nfs_client *clp = server->nfs_client; 3071 struct nfs_lockt_args arg = { 3072 .fh = NFS_FH(inode), 3073 .fl = request, 3074 }; 3075 struct nfs_lockt_res res = { 3076 .denied = request, 3077 }; 3078 struct rpc_message msg = { 3079 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 3080 .rpc_argp = &arg, 3081 .rpc_resp = &res, 3082 .rpc_cred = state->owner->so_cred, 3083 }; 3084 struct nfs4_lock_state *lsp; 3085 int status; 3086 3087 down_read(&clp->cl_sem); 3088 arg.lock_owner.clientid = clp->cl_clientid; 3089 status = nfs4_set_lock_state(state, request); 3090 if (status != 0) 3091 goto out; 3092 lsp = request->fl_u.nfs4_fl.owner; 3093 arg.lock_owner.id = lsp->ls_id.id; 3094 status = rpc_call_sync(server->client, &msg, 0); 3095 switch (status) { 3096 case 0: 3097 request->fl_type = F_UNLCK; 3098 break; 3099 case -NFS4ERR_DENIED: 3100 status = 0; 3101 } 3102 request->fl_ops->fl_release_private(request); 3103 out: 3104 up_read(&clp->cl_sem); 3105 return status; 3106 } 3107 3108 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3109 { 3110 struct nfs4_exception exception = { }; 3111 int err; 3112 3113 do { 3114 err = nfs4_handle_exception(NFS_SERVER(state->inode), 3115 _nfs4_proc_getlk(state, cmd, request), 3116 &exception); 3117 } while (exception.retry); 3118 return err; 3119 } 3120 3121 static int do_vfs_lock(struct file *file, struct file_lock *fl) 3122 { 3123 int res = 0; 3124 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 3125 case FL_POSIX: 3126 res = posix_lock_file_wait(file, fl); 3127 break; 3128 case FL_FLOCK: 3129 res = flock_lock_file_wait(file, fl); 3130 break; 3131 default: 3132 BUG(); 3133 } 3134 return res; 3135 } 3136 3137 struct nfs4_unlockdata { 3138 struct nfs_locku_args arg; 3139 struct nfs_locku_res res; 3140 struct nfs4_lock_state *lsp; 3141 struct nfs_open_context *ctx; 3142 struct file_lock fl; 3143 const struct nfs_server *server; 3144 unsigned long timestamp; 3145 }; 3146 3147 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 3148 struct nfs_open_context *ctx, 3149 struct nfs4_lock_state *lsp, 3150 struct nfs_seqid *seqid) 3151 { 3152 struct nfs4_unlockdata *p; 3153 struct inode *inode = lsp->ls_state->inode; 3154 3155 p = kmalloc(sizeof(*p), GFP_KERNEL); 3156 if (p == NULL) 3157 return NULL; 3158 p->arg.fh = NFS_FH(inode); 3159 p->arg.fl = &p->fl; 3160 p->arg.seqid = seqid; 3161 p->arg.stateid = &lsp->ls_stateid; 3162 p->lsp = lsp; 3163 atomic_inc(&lsp->ls_count); 3164 /* Ensure we don't close file until we're done freeing locks! */ 3165 p->ctx = get_nfs_open_context(ctx); 3166 memcpy(&p->fl, fl, sizeof(p->fl)); 3167 p->server = NFS_SERVER(inode); 3168 return p; 3169 } 3170 3171 static void nfs4_locku_release_calldata(void *data) 3172 { 3173 struct nfs4_unlockdata *calldata = data; 3174 nfs_free_seqid(calldata->arg.seqid); 3175 nfs4_put_lock_state(calldata->lsp); 3176 put_nfs_open_context(calldata->ctx); 3177 kfree(calldata); 3178 } 3179 3180 static void nfs4_locku_done(struct rpc_task *task, void *data) 3181 { 3182 struct nfs4_unlockdata *calldata = data; 3183 3184 if (RPC_ASSASSINATED(task)) 3185 return; 3186 nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid); 3187 switch (task->tk_status) { 3188 case 0: 3189 memcpy(calldata->lsp->ls_stateid.data, 3190 calldata->res.stateid.data, 3191 sizeof(calldata->lsp->ls_stateid.data)); 3192 renew_lease(calldata->server, calldata->timestamp); 3193 break; 3194 case -NFS4ERR_STALE_STATEID: 3195 case -NFS4ERR_EXPIRED: 3196 break; 3197 default: 3198 if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) 3199 rpc_restart_call(task); 3200 } 3201 } 3202 3203 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 3204 { 3205 struct nfs4_unlockdata *calldata = data; 3206 3207 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3208 return; 3209 if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) { 3210 /* Note: exit _without_ running nfs4_locku_done */ 3211 task->tk_action = NULL; 3212 return; 3213 } 3214 calldata->timestamp = jiffies; 3215 rpc_call_start(task); 3216 } 3217 3218 static const struct rpc_call_ops nfs4_locku_ops = { 3219 .rpc_call_prepare = nfs4_locku_prepare, 3220 .rpc_call_done = nfs4_locku_done, 3221 .rpc_release = nfs4_locku_release_calldata, 3222 }; 3223 3224 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 3225 struct nfs_open_context *ctx, 3226 struct nfs4_lock_state *lsp, 3227 struct nfs_seqid *seqid) 3228 { 3229 struct nfs4_unlockdata *data; 3230 struct rpc_message msg = { 3231 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 3232 .rpc_cred = ctx->cred, 3233 }; 3234 struct rpc_task_setup task_setup_data = { 3235 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 3236 .rpc_message = &msg, 3237 .callback_ops = &nfs4_locku_ops, 3238 .flags = RPC_TASK_ASYNC, 3239 }; 3240 3241 /* Ensure this is an unlock - when canceling a lock, the 3242 * canceled lock is passed in, and it won't be an unlock. 3243 */ 3244 fl->fl_type = F_UNLCK; 3245 3246 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 3247 if (data == NULL) { 3248 nfs_free_seqid(seqid); 3249 return ERR_PTR(-ENOMEM); 3250 } 3251 3252 msg.rpc_argp = &data->arg, 3253 msg.rpc_resp = &data->res, 3254 task_setup_data.callback_data = data; 3255 return rpc_run_task(&task_setup_data); 3256 } 3257 3258 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 3259 { 3260 struct nfs_seqid *seqid; 3261 struct nfs4_lock_state *lsp; 3262 struct rpc_task *task; 3263 int status = 0; 3264 3265 status = nfs4_set_lock_state(state, request); 3266 /* Unlock _before_ we do the RPC call */ 3267 request->fl_flags |= FL_EXISTS; 3268 if (do_vfs_lock(request->fl_file, request) == -ENOENT) 3269 goto out; 3270 if (status != 0) 3271 goto out; 3272 /* Is this a delegated lock? */ 3273 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) 3274 goto out; 3275 lsp = request->fl_u.nfs4_fl.owner; 3276 seqid = nfs_alloc_seqid(&lsp->ls_seqid); 3277 status = -ENOMEM; 3278 if (seqid == NULL) 3279 goto out; 3280 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 3281 status = PTR_ERR(task); 3282 if (IS_ERR(task)) 3283 goto out; 3284 status = nfs4_wait_for_completion_rpc_task(task); 3285 rpc_put_task(task); 3286 out: 3287 return status; 3288 } 3289 3290 struct nfs4_lockdata { 3291 struct nfs_lock_args arg; 3292 struct nfs_lock_res res; 3293 struct nfs4_lock_state *lsp; 3294 struct nfs_open_context *ctx; 3295 struct file_lock fl; 3296 unsigned long timestamp; 3297 int rpc_status; 3298 int cancelled; 3299 }; 3300 3301 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 3302 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp) 3303 { 3304 struct nfs4_lockdata *p; 3305 struct inode *inode = lsp->ls_state->inode; 3306 struct nfs_server *server = NFS_SERVER(inode); 3307 3308 p = kzalloc(sizeof(*p), GFP_KERNEL); 3309 if (p == NULL) 3310 return NULL; 3311 3312 p->arg.fh = NFS_FH(inode); 3313 p->arg.fl = &p->fl; 3314 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid); 3315 if (p->arg.open_seqid == NULL) 3316 goto out_free; 3317 p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid); 3318 if (p->arg.lock_seqid == NULL) 3319 goto out_free_seqid; 3320 p->arg.lock_stateid = &lsp->ls_stateid; 3321 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 3322 p->arg.lock_owner.id = lsp->ls_id.id; 3323 p->lsp = lsp; 3324 atomic_inc(&lsp->ls_count); 3325 p->ctx = get_nfs_open_context(ctx); 3326 memcpy(&p->fl, fl, sizeof(p->fl)); 3327 return p; 3328 out_free_seqid: 3329 nfs_free_seqid(p->arg.open_seqid); 3330 out_free: 3331 kfree(p); 3332 return NULL; 3333 } 3334 3335 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 3336 { 3337 struct nfs4_lockdata *data = calldata; 3338 struct nfs4_state *state = data->lsp->ls_state; 3339 3340 dprintk("%s: begin!\n", __FUNCTION__); 3341 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 3342 return; 3343 /* Do we need to do an open_to_lock_owner? */ 3344 if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { 3345 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) 3346 return; 3347 data->arg.open_stateid = &state->stateid; 3348 data->arg.new_lock_owner = 1; 3349 } else 3350 data->arg.new_lock_owner = 0; 3351 data->timestamp = jiffies; 3352 rpc_call_start(task); 3353 dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status); 3354 } 3355 3356 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 3357 { 3358 struct nfs4_lockdata *data = calldata; 3359 3360 dprintk("%s: begin!\n", __FUNCTION__); 3361 3362 data->rpc_status = task->tk_status; 3363 if (RPC_ASSASSINATED(task)) 3364 goto out; 3365 if (data->arg.new_lock_owner != 0) { 3366 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid); 3367 if (data->rpc_status == 0) 3368 nfs_confirm_seqid(&data->lsp->ls_seqid, 0); 3369 else 3370 goto out; 3371 } 3372 if (data->rpc_status == 0) { 3373 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data, 3374 sizeof(data->lsp->ls_stateid.data)); 3375 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED; 3376 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp); 3377 } 3378 nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid); 3379 out: 3380 dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status); 3381 } 3382 3383 static void nfs4_lock_release(void *calldata) 3384 { 3385 struct nfs4_lockdata *data = calldata; 3386 3387 dprintk("%s: begin!\n", __FUNCTION__); 3388 nfs_free_seqid(data->arg.open_seqid); 3389 if (data->cancelled != 0) { 3390 struct rpc_task *task; 3391 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 3392 data->arg.lock_seqid); 3393 if (!IS_ERR(task)) 3394 rpc_put_task(task); 3395 dprintk("%s: cancelling lock!\n", __FUNCTION__); 3396 } else 3397 nfs_free_seqid(data->arg.lock_seqid); 3398 nfs4_put_lock_state(data->lsp); 3399 put_nfs_open_context(data->ctx); 3400 kfree(data); 3401 dprintk("%s: done!\n", __FUNCTION__); 3402 } 3403 3404 static const struct rpc_call_ops nfs4_lock_ops = { 3405 .rpc_call_prepare = nfs4_lock_prepare, 3406 .rpc_call_done = nfs4_lock_done, 3407 .rpc_release = nfs4_lock_release, 3408 }; 3409 3410 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim) 3411 { 3412 struct nfs4_lockdata *data; 3413 struct rpc_task *task; 3414 struct rpc_message msg = { 3415 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 3416 .rpc_cred = state->owner->so_cred, 3417 }; 3418 struct rpc_task_setup task_setup_data = { 3419 .rpc_client = NFS_CLIENT(state->inode), 3420 .rpc_message = &msg, 3421 .callback_ops = &nfs4_lock_ops, 3422 .flags = RPC_TASK_ASYNC, 3423 }; 3424 int ret; 3425 3426 dprintk("%s: begin!\n", __FUNCTION__); 3427 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 3428 fl->fl_u.nfs4_fl.owner); 3429 if (data == NULL) 3430 return -ENOMEM; 3431 if (IS_SETLKW(cmd)) 3432 data->arg.block = 1; 3433 if (reclaim != 0) 3434 data->arg.reclaim = 1; 3435 msg.rpc_argp = &data->arg, 3436 msg.rpc_resp = &data->res, 3437 task_setup_data.callback_data = data; 3438 task = rpc_run_task(&task_setup_data); 3439 if (IS_ERR(task)) 3440 return PTR_ERR(task); 3441 ret = nfs4_wait_for_completion_rpc_task(task); 3442 if (ret == 0) { 3443 ret = data->rpc_status; 3444 if (ret == -NFS4ERR_DENIED) 3445 ret = -EAGAIN; 3446 } else 3447 data->cancelled = 1; 3448 rpc_put_task(task); 3449 dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret); 3450 return ret; 3451 } 3452 3453 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 3454 { 3455 struct nfs_server *server = NFS_SERVER(state->inode); 3456 struct nfs4_exception exception = { }; 3457 int err; 3458 3459 do { 3460 /* Cache the lock if possible... */ 3461 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 3462 return 0; 3463 err = _nfs4_do_setlk(state, F_SETLK, request, 1); 3464 if (err != -NFS4ERR_DELAY) 3465 break; 3466 nfs4_handle_exception(server, err, &exception); 3467 } while (exception.retry); 3468 return err; 3469 } 3470 3471 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 3472 { 3473 struct nfs_server *server = NFS_SERVER(state->inode); 3474 struct nfs4_exception exception = { }; 3475 int err; 3476 3477 err = nfs4_set_lock_state(state, request); 3478 if (err != 0) 3479 return err; 3480 do { 3481 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 3482 return 0; 3483 err = _nfs4_do_setlk(state, F_SETLK, request, 0); 3484 if (err != -NFS4ERR_DELAY) 3485 break; 3486 nfs4_handle_exception(server, err, &exception); 3487 } while (exception.retry); 3488 return err; 3489 } 3490 3491 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3492 { 3493 struct nfs_client *clp = state->owner->so_client; 3494 unsigned char fl_flags = request->fl_flags; 3495 int status; 3496 3497 /* Is this a delegated open? */ 3498 status = nfs4_set_lock_state(state, request); 3499 if (status != 0) 3500 goto out; 3501 request->fl_flags |= FL_ACCESS; 3502 status = do_vfs_lock(request->fl_file, request); 3503 if (status < 0) 3504 goto out; 3505 down_read(&clp->cl_sem); 3506 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 3507 struct nfs_inode *nfsi = NFS_I(state->inode); 3508 /* Yes: cache locks! */ 3509 down_read(&nfsi->rwsem); 3510 /* ...but avoid races with delegation recall... */ 3511 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 3512 request->fl_flags = fl_flags & ~FL_SLEEP; 3513 status = do_vfs_lock(request->fl_file, request); 3514 up_read(&nfsi->rwsem); 3515 goto out_unlock; 3516 } 3517 up_read(&nfsi->rwsem); 3518 } 3519 status = _nfs4_do_setlk(state, cmd, request, 0); 3520 if (status != 0) 3521 goto out_unlock; 3522 /* Note: we always want to sleep here! */ 3523 request->fl_flags = fl_flags | FL_SLEEP; 3524 if (do_vfs_lock(request->fl_file, request) < 0) 3525 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); 3526 out_unlock: 3527 up_read(&clp->cl_sem); 3528 out: 3529 request->fl_flags = fl_flags; 3530 return status; 3531 } 3532 3533 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 3534 { 3535 struct nfs4_exception exception = { }; 3536 int err; 3537 3538 do { 3539 err = nfs4_handle_exception(NFS_SERVER(state->inode), 3540 _nfs4_proc_setlk(state, cmd, request), 3541 &exception); 3542 } while (exception.retry); 3543 return err; 3544 } 3545 3546 static int 3547 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 3548 { 3549 struct nfs_open_context *ctx; 3550 struct nfs4_state *state; 3551 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 3552 int status; 3553 3554 /* verify open state */ 3555 ctx = nfs_file_open_context(filp); 3556 state = ctx->state; 3557 3558 if (request->fl_start < 0 || request->fl_end < 0) 3559 return -EINVAL; 3560 3561 if (IS_GETLK(cmd)) 3562 return nfs4_proc_getlk(state, F_GETLK, request); 3563 3564 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 3565 return -EINVAL; 3566 3567 if (request->fl_type == F_UNLCK) 3568 return nfs4_proc_unlck(state, cmd, request); 3569 3570 do { 3571 status = nfs4_proc_setlk(state, cmd, request); 3572 if ((status != -EAGAIN) || IS_SETLK(cmd)) 3573 break; 3574 timeout = nfs4_set_lock_task_retry(timeout); 3575 status = -ERESTARTSYS; 3576 if (signalled()) 3577 break; 3578 } while(status < 0); 3579 return status; 3580 } 3581 3582 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl) 3583 { 3584 struct nfs_server *server = NFS_SERVER(state->inode); 3585 struct nfs4_exception exception = { }; 3586 int err; 3587 3588 err = nfs4_set_lock_state(state, fl); 3589 if (err != 0) 3590 goto out; 3591 do { 3592 err = _nfs4_do_setlk(state, F_SETLK, fl, 0); 3593 if (err != -NFS4ERR_DELAY) 3594 break; 3595 err = nfs4_handle_exception(server, err, &exception); 3596 } while (exception.retry); 3597 out: 3598 return err; 3599 } 3600 3601 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 3602 3603 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf, 3604 size_t buflen, int flags) 3605 { 3606 struct inode *inode = dentry->d_inode; 3607 3608 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) 3609 return -EOPNOTSUPP; 3610 3611 return nfs4_proc_set_acl(inode, buf, buflen); 3612 } 3613 3614 /* The getxattr man page suggests returning -ENODATA for unknown attributes, 3615 * and that's what we'll do for e.g. user attributes that haven't been set. 3616 * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported 3617 * attributes in kernel-managed attribute namespaces. */ 3618 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf, 3619 size_t buflen) 3620 { 3621 struct inode *inode = dentry->d_inode; 3622 3623 if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) 3624 return -EOPNOTSUPP; 3625 3626 return nfs4_proc_get_acl(inode, buf, buflen); 3627 } 3628 3629 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen) 3630 { 3631 size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1; 3632 3633 if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode))) 3634 return 0; 3635 if (buf && buflen < len) 3636 return -ERANGE; 3637 if (buf) 3638 memcpy(buf, XATTR_NAME_NFSV4_ACL, len); 3639 return len; 3640 } 3641 3642 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name, 3643 struct nfs4_fs_locations *fs_locations, struct page *page) 3644 { 3645 struct nfs_server *server = NFS_SERVER(dir); 3646 u32 bitmask[2] = { 3647 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 3648 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID, 3649 }; 3650 struct nfs4_fs_locations_arg args = { 3651 .dir_fh = NFS_FH(dir), 3652 .name = name, 3653 .page = page, 3654 .bitmask = bitmask, 3655 }; 3656 struct rpc_message msg = { 3657 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 3658 .rpc_argp = &args, 3659 .rpc_resp = fs_locations, 3660 }; 3661 int status; 3662 3663 dprintk("%s: start\n", __FUNCTION__); 3664 nfs_fattr_init(&fs_locations->fattr); 3665 fs_locations->server = server; 3666 fs_locations->nlocations = 0; 3667 status = rpc_call_sync(server->client, &msg, 0); 3668 dprintk("%s: returned status = %d\n", __FUNCTION__, status); 3669 return status; 3670 } 3671 3672 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = { 3673 .recover_open = nfs4_open_reclaim, 3674 .recover_lock = nfs4_lock_reclaim, 3675 }; 3676 3677 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = { 3678 .recover_open = nfs4_open_expired, 3679 .recover_lock = nfs4_lock_expired, 3680 }; 3681 3682 static const struct inode_operations nfs4_file_inode_operations = { 3683 .permission = nfs_permission, 3684 .getattr = nfs_getattr, 3685 .setattr = nfs_setattr, 3686 .getxattr = nfs4_getxattr, 3687 .setxattr = nfs4_setxattr, 3688 .listxattr = nfs4_listxattr, 3689 }; 3690 3691 const struct nfs_rpc_ops nfs_v4_clientops = { 3692 .version = 4, /* protocol version */ 3693 .dentry_ops = &nfs4_dentry_operations, 3694 .dir_inode_ops = &nfs4_dir_inode_operations, 3695 .file_inode_ops = &nfs4_file_inode_operations, 3696 .getroot = nfs4_proc_get_root, 3697 .getattr = nfs4_proc_getattr, 3698 .setattr = nfs4_proc_setattr, 3699 .lookupfh = nfs4_proc_lookupfh, 3700 .lookup = nfs4_proc_lookup, 3701 .access = nfs4_proc_access, 3702 .readlink = nfs4_proc_readlink, 3703 .create = nfs4_proc_create, 3704 .remove = nfs4_proc_remove, 3705 .unlink_setup = nfs4_proc_unlink_setup, 3706 .unlink_done = nfs4_proc_unlink_done, 3707 .rename = nfs4_proc_rename, 3708 .link = nfs4_proc_link, 3709 .symlink = nfs4_proc_symlink, 3710 .mkdir = nfs4_proc_mkdir, 3711 .rmdir = nfs4_proc_remove, 3712 .readdir = nfs4_proc_readdir, 3713 .mknod = nfs4_proc_mknod, 3714 .statfs = nfs4_proc_statfs, 3715 .fsinfo = nfs4_proc_fsinfo, 3716 .pathconf = nfs4_proc_pathconf, 3717 .set_capabilities = nfs4_server_capabilities, 3718 .decode_dirent = nfs4_decode_dirent, 3719 .read_setup = nfs4_proc_read_setup, 3720 .read_done = nfs4_read_done, 3721 .write_setup = nfs4_proc_write_setup, 3722 .write_done = nfs4_write_done, 3723 .commit_setup = nfs4_proc_commit_setup, 3724 .commit_done = nfs4_commit_done, 3725 .file_open = nfs_open, 3726 .file_release = nfs_release, 3727 .lock = nfs4_proc_lock, 3728 .clear_acl_cache = nfs4_zap_acl_attr, 3729 }; 3730 3731 /* 3732 * Local variables: 3733 * c-basic-offset: 8 3734 * End: 3735 */ 3736