1 /* 2 * fs/nfs/nfs4state.c 3 * 4 * Client-side XDR 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 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its 21 * contributors may be used to endorse or promote products derived 22 * from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 * 36 * Implementation of the NFSv4 state model. For the time being, 37 * this is minimal, but will be made much more complex in a 38 * subsequent patch. 39 */ 40 41 #include <linux/kernel.h> 42 #include <linux/slab.h> 43 #include <linux/smp_lock.h> 44 #include <linux/nfs_fs.h> 45 #include <linux/nfs_idmap.h> 46 #include <linux/kthread.h> 47 #include <linux/module.h> 48 #include <linux/random.h> 49 #include <linux/workqueue.h> 50 #include <linux/bitops.h> 51 52 #include "nfs4_fs.h" 53 #include "callback.h" 54 #include "delegation.h" 55 #include "internal.h" 56 57 #define OPENOWNER_POOL_SIZE 8 58 59 const nfs4_stateid zero_stateid; 60 61 static LIST_HEAD(nfs4_clientid_list); 62 63 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) 64 { 65 unsigned short port; 66 int status; 67 68 port = nfs_callback_tcpport; 69 if (clp->cl_addr.ss_family == AF_INET6) 70 port = nfs_callback_tcpport6; 71 72 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred); 73 if (status == 0) 74 status = nfs4_proc_setclientid_confirm(clp, cred); 75 if (status == 0) 76 nfs4_schedule_state_renewal(clp); 77 return status; 78 } 79 80 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) 81 { 82 struct rpc_cred *cred = NULL; 83 84 if (clp->cl_machine_cred != NULL) 85 cred = get_rpccred(clp->cl_machine_cred); 86 return cred; 87 } 88 89 static void nfs4_clear_machine_cred(struct nfs_client *clp) 90 { 91 struct rpc_cred *cred; 92 93 spin_lock(&clp->cl_lock); 94 cred = clp->cl_machine_cred; 95 clp->cl_machine_cred = NULL; 96 spin_unlock(&clp->cl_lock); 97 if (cred != NULL) 98 put_rpccred(cred); 99 } 100 101 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) 102 { 103 struct nfs4_state_owner *sp; 104 struct rb_node *pos; 105 struct rpc_cred *cred = NULL; 106 107 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { 108 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); 109 if (list_empty(&sp->so_states)) 110 continue; 111 cred = get_rpccred(sp->so_cred); 112 break; 113 } 114 return cred; 115 } 116 117 #if defined(CONFIG_NFS_V4_1) 118 119 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) 120 { 121 struct rpc_cred *cred; 122 123 spin_lock(&clp->cl_lock); 124 cred = nfs4_get_machine_cred_locked(clp); 125 spin_unlock(&clp->cl_lock); 126 return cred; 127 } 128 129 #endif /* CONFIG_NFS_V4_1 */ 130 131 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) 132 { 133 struct nfs4_state_owner *sp; 134 struct rb_node *pos; 135 struct rpc_cred *cred; 136 137 spin_lock(&clp->cl_lock); 138 cred = nfs4_get_machine_cred_locked(clp); 139 if (cred != NULL) 140 goto out; 141 pos = rb_first(&clp->cl_state_owners); 142 if (pos != NULL) { 143 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); 144 cred = get_rpccred(sp->so_cred); 145 } 146 out: 147 spin_unlock(&clp->cl_lock); 148 return cred; 149 } 150 151 static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, 152 __u64 minval, int maxbits) 153 { 154 struct rb_node **p, *parent; 155 struct nfs_unique_id *pos; 156 __u64 mask = ~0ULL; 157 158 if (maxbits < 64) 159 mask = (1ULL << maxbits) - 1ULL; 160 161 /* Ensure distribution is more or less flat */ 162 get_random_bytes(&new->id, sizeof(new->id)); 163 new->id &= mask; 164 if (new->id < minval) 165 new->id += minval; 166 retry: 167 p = &root->rb_node; 168 parent = NULL; 169 170 while (*p != NULL) { 171 parent = *p; 172 pos = rb_entry(parent, struct nfs_unique_id, rb_node); 173 174 if (new->id < pos->id) 175 p = &(*p)->rb_left; 176 else if (new->id > pos->id) 177 p = &(*p)->rb_right; 178 else 179 goto id_exists; 180 } 181 rb_link_node(&new->rb_node, parent, p); 182 rb_insert_color(&new->rb_node, root); 183 return; 184 id_exists: 185 for (;;) { 186 new->id++; 187 if (new->id < minval || (new->id & mask) != new->id) { 188 new->id = minval; 189 break; 190 } 191 parent = rb_next(parent); 192 if (parent == NULL) 193 break; 194 pos = rb_entry(parent, struct nfs_unique_id, rb_node); 195 if (new->id < pos->id) 196 break; 197 } 198 goto retry; 199 } 200 201 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) 202 { 203 rb_erase(&id->rb_node, root); 204 } 205 206 static struct nfs4_state_owner * 207 nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred) 208 { 209 struct nfs_client *clp = server->nfs_client; 210 struct rb_node **p = &clp->cl_state_owners.rb_node, 211 *parent = NULL; 212 struct nfs4_state_owner *sp, *res = NULL; 213 214 while (*p != NULL) { 215 parent = *p; 216 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); 217 218 if (server < sp->so_server) { 219 p = &parent->rb_left; 220 continue; 221 } 222 if (server > sp->so_server) { 223 p = &parent->rb_right; 224 continue; 225 } 226 if (cred < sp->so_cred) 227 p = &parent->rb_left; 228 else if (cred > sp->so_cred) 229 p = &parent->rb_right; 230 else { 231 atomic_inc(&sp->so_count); 232 res = sp; 233 break; 234 } 235 } 236 return res; 237 } 238 239 static struct nfs4_state_owner * 240 nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) 241 { 242 struct rb_node **p = &clp->cl_state_owners.rb_node, 243 *parent = NULL; 244 struct nfs4_state_owner *sp; 245 246 while (*p != NULL) { 247 parent = *p; 248 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); 249 250 if (new->so_server < sp->so_server) { 251 p = &parent->rb_left; 252 continue; 253 } 254 if (new->so_server > sp->so_server) { 255 p = &parent->rb_right; 256 continue; 257 } 258 if (new->so_cred < sp->so_cred) 259 p = &parent->rb_left; 260 else if (new->so_cred > sp->so_cred) 261 p = &parent->rb_right; 262 else { 263 atomic_inc(&sp->so_count); 264 return sp; 265 } 266 } 267 nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); 268 rb_link_node(&new->so_client_node, parent, p); 269 rb_insert_color(&new->so_client_node, &clp->cl_state_owners); 270 return new; 271 } 272 273 static void 274 nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) 275 { 276 if (!RB_EMPTY_NODE(&sp->so_client_node)) 277 rb_erase(&sp->so_client_node, &clp->cl_state_owners); 278 nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); 279 } 280 281 /* 282 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to 283 * create a new state_owner. 284 * 285 */ 286 static struct nfs4_state_owner * 287 nfs4_alloc_state_owner(void) 288 { 289 struct nfs4_state_owner *sp; 290 291 sp = kzalloc(sizeof(*sp),GFP_KERNEL); 292 if (!sp) 293 return NULL; 294 spin_lock_init(&sp->so_lock); 295 INIT_LIST_HEAD(&sp->so_states); 296 INIT_LIST_HEAD(&sp->so_delegations); 297 rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); 298 sp->so_seqid.sequence = &sp->so_sequence; 299 spin_lock_init(&sp->so_sequence.lock); 300 INIT_LIST_HEAD(&sp->so_sequence.list); 301 atomic_set(&sp->so_count, 1); 302 return sp; 303 } 304 305 static void 306 nfs4_drop_state_owner(struct nfs4_state_owner *sp) 307 { 308 if (!RB_EMPTY_NODE(&sp->so_client_node)) { 309 struct nfs_client *clp = sp->so_client; 310 311 spin_lock(&clp->cl_lock); 312 rb_erase(&sp->so_client_node, &clp->cl_state_owners); 313 RB_CLEAR_NODE(&sp->so_client_node); 314 spin_unlock(&clp->cl_lock); 315 } 316 } 317 318 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) 319 { 320 struct nfs_client *clp = server->nfs_client; 321 struct nfs4_state_owner *sp, *new; 322 323 spin_lock(&clp->cl_lock); 324 sp = nfs4_find_state_owner(server, cred); 325 spin_unlock(&clp->cl_lock); 326 if (sp != NULL) 327 return sp; 328 new = nfs4_alloc_state_owner(); 329 if (new == NULL) 330 return NULL; 331 new->so_client = clp; 332 new->so_server = server; 333 new->so_cred = cred; 334 spin_lock(&clp->cl_lock); 335 sp = nfs4_insert_state_owner(clp, new); 336 spin_unlock(&clp->cl_lock); 337 if (sp == new) 338 get_rpccred(cred); 339 else { 340 rpc_destroy_wait_queue(&new->so_sequence.wait); 341 kfree(new); 342 } 343 return sp; 344 } 345 346 void nfs4_put_state_owner(struct nfs4_state_owner *sp) 347 { 348 struct nfs_client *clp = sp->so_client; 349 struct rpc_cred *cred = sp->so_cred; 350 351 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) 352 return; 353 nfs4_remove_state_owner(clp, sp); 354 spin_unlock(&clp->cl_lock); 355 rpc_destroy_wait_queue(&sp->so_sequence.wait); 356 put_rpccred(cred); 357 kfree(sp); 358 } 359 360 static struct nfs4_state * 361 nfs4_alloc_open_state(void) 362 { 363 struct nfs4_state *state; 364 365 state = kzalloc(sizeof(*state), GFP_KERNEL); 366 if (!state) 367 return NULL; 368 atomic_set(&state->count, 1); 369 INIT_LIST_HEAD(&state->lock_states); 370 spin_lock_init(&state->state_lock); 371 seqlock_init(&state->seqlock); 372 return state; 373 } 374 375 void 376 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) 377 { 378 if (state->state == fmode) 379 return; 380 /* NB! List reordering - see the reclaim code for why. */ 381 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { 382 if (fmode & FMODE_WRITE) 383 list_move(&state->open_states, &state->owner->so_states); 384 else 385 list_move_tail(&state->open_states, &state->owner->so_states); 386 } 387 state->state = fmode; 388 } 389 390 static struct nfs4_state * 391 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) 392 { 393 struct nfs_inode *nfsi = NFS_I(inode); 394 struct nfs4_state *state; 395 396 list_for_each_entry(state, &nfsi->open_states, inode_states) { 397 if (state->owner != owner) 398 continue; 399 if (atomic_inc_not_zero(&state->count)) 400 return state; 401 } 402 return NULL; 403 } 404 405 static void 406 nfs4_free_open_state(struct nfs4_state *state) 407 { 408 kfree(state); 409 } 410 411 struct nfs4_state * 412 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) 413 { 414 struct nfs4_state *state, *new; 415 struct nfs_inode *nfsi = NFS_I(inode); 416 417 spin_lock(&inode->i_lock); 418 state = __nfs4_find_state_byowner(inode, owner); 419 spin_unlock(&inode->i_lock); 420 if (state) 421 goto out; 422 new = nfs4_alloc_open_state(); 423 spin_lock(&owner->so_lock); 424 spin_lock(&inode->i_lock); 425 state = __nfs4_find_state_byowner(inode, owner); 426 if (state == NULL && new != NULL) { 427 state = new; 428 state->owner = owner; 429 atomic_inc(&owner->so_count); 430 list_add(&state->inode_states, &nfsi->open_states); 431 state->inode = igrab(inode); 432 spin_unlock(&inode->i_lock); 433 /* Note: The reclaim code dictates that we add stateless 434 * and read-only stateids to the end of the list */ 435 list_add_tail(&state->open_states, &owner->so_states); 436 spin_unlock(&owner->so_lock); 437 } else { 438 spin_unlock(&inode->i_lock); 439 spin_unlock(&owner->so_lock); 440 if (new) 441 nfs4_free_open_state(new); 442 } 443 out: 444 return state; 445 } 446 447 void nfs4_put_open_state(struct nfs4_state *state) 448 { 449 struct inode *inode = state->inode; 450 struct nfs4_state_owner *owner = state->owner; 451 452 if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) 453 return; 454 spin_lock(&inode->i_lock); 455 list_del(&state->inode_states); 456 list_del(&state->open_states); 457 spin_unlock(&inode->i_lock); 458 spin_unlock(&owner->so_lock); 459 iput(inode); 460 nfs4_free_open_state(state); 461 nfs4_put_state_owner(owner); 462 } 463 464 /* 465 * Close the current file. 466 */ 467 static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait) 468 { 469 struct nfs4_state_owner *owner = state->owner; 470 int call_close = 0; 471 fmode_t newstate; 472 473 atomic_inc(&owner->so_count); 474 /* Protect against nfs4_find_state() */ 475 spin_lock(&owner->so_lock); 476 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 477 case FMODE_READ: 478 state->n_rdonly--; 479 break; 480 case FMODE_WRITE: 481 state->n_wronly--; 482 break; 483 case FMODE_READ|FMODE_WRITE: 484 state->n_rdwr--; 485 } 486 newstate = FMODE_READ|FMODE_WRITE; 487 if (state->n_rdwr == 0) { 488 if (state->n_rdonly == 0) { 489 newstate &= ~FMODE_READ; 490 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); 491 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 492 } 493 if (state->n_wronly == 0) { 494 newstate &= ~FMODE_WRITE; 495 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); 496 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); 497 } 498 if (newstate == 0) 499 clear_bit(NFS_DELEGATED_STATE, &state->flags); 500 } 501 nfs4_state_set_mode_locked(state, newstate); 502 spin_unlock(&owner->so_lock); 503 504 if (!call_close) { 505 nfs4_put_open_state(state); 506 nfs4_put_state_owner(owner); 507 } else 508 nfs4_do_close(path, state, wait); 509 } 510 511 void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) 512 { 513 __nfs4_close(path, state, fmode, 0); 514 } 515 516 void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) 517 { 518 __nfs4_close(path, state, fmode, 1); 519 } 520 521 /* 522 * Search the state->lock_states for an existing lock_owner 523 * that is compatible with current->files 524 */ 525 static struct nfs4_lock_state * 526 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) 527 { 528 struct nfs4_lock_state *pos; 529 list_for_each_entry(pos, &state->lock_states, ls_locks) { 530 if (pos->ls_owner != fl_owner) 531 continue; 532 atomic_inc(&pos->ls_count); 533 return pos; 534 } 535 return NULL; 536 } 537 538 /* 539 * Return a compatible lock_state. If no initialized lock_state structure 540 * exists, return an uninitialized one. 541 * 542 */ 543 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) 544 { 545 struct nfs4_lock_state *lsp; 546 struct nfs_client *clp = state->owner->so_client; 547 548 lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); 549 if (lsp == NULL) 550 return NULL; 551 rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); 552 spin_lock_init(&lsp->ls_sequence.lock); 553 INIT_LIST_HEAD(&lsp->ls_sequence.list); 554 lsp->ls_seqid.sequence = &lsp->ls_sequence; 555 atomic_set(&lsp->ls_count, 1); 556 lsp->ls_state = state; 557 lsp->ls_owner = fl_owner; 558 spin_lock(&clp->cl_lock); 559 nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); 560 spin_unlock(&clp->cl_lock); 561 INIT_LIST_HEAD(&lsp->ls_locks); 562 return lsp; 563 } 564 565 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) 566 { 567 struct nfs_client *clp = lsp->ls_state->owner->so_client; 568 569 spin_lock(&clp->cl_lock); 570 nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); 571 spin_unlock(&clp->cl_lock); 572 rpc_destroy_wait_queue(&lsp->ls_sequence.wait); 573 kfree(lsp); 574 } 575 576 /* 577 * Return a compatible lock_state. If no initialized lock_state structure 578 * exists, return an uninitialized one. 579 * 580 */ 581 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) 582 { 583 struct nfs4_lock_state *lsp, *new = NULL; 584 585 for(;;) { 586 spin_lock(&state->state_lock); 587 lsp = __nfs4_find_lock_state(state, owner); 588 if (lsp != NULL) 589 break; 590 if (new != NULL) { 591 list_add(&new->ls_locks, &state->lock_states); 592 set_bit(LK_STATE_IN_USE, &state->flags); 593 lsp = new; 594 new = NULL; 595 break; 596 } 597 spin_unlock(&state->state_lock); 598 new = nfs4_alloc_lock_state(state, owner); 599 if (new == NULL) 600 return NULL; 601 } 602 spin_unlock(&state->state_lock); 603 if (new != NULL) 604 nfs4_free_lock_state(new); 605 return lsp; 606 } 607 608 /* 609 * Release reference to lock_state, and free it if we see that 610 * it is no longer in use 611 */ 612 void nfs4_put_lock_state(struct nfs4_lock_state *lsp) 613 { 614 struct nfs4_state *state; 615 616 if (lsp == NULL) 617 return; 618 state = lsp->ls_state; 619 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) 620 return; 621 list_del(&lsp->ls_locks); 622 if (list_empty(&state->lock_states)) 623 clear_bit(LK_STATE_IN_USE, &state->flags); 624 spin_unlock(&state->state_lock); 625 nfs4_free_lock_state(lsp); 626 } 627 628 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) 629 { 630 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; 631 632 dst->fl_u.nfs4_fl.owner = lsp; 633 atomic_inc(&lsp->ls_count); 634 } 635 636 static void nfs4_fl_release_lock(struct file_lock *fl) 637 { 638 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); 639 } 640 641 static const struct file_lock_operations nfs4_fl_lock_ops = { 642 .fl_copy_lock = nfs4_fl_copy_lock, 643 .fl_release_private = nfs4_fl_release_lock, 644 }; 645 646 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) 647 { 648 struct nfs4_lock_state *lsp; 649 650 if (fl->fl_ops != NULL) 651 return 0; 652 lsp = nfs4_get_lock_state(state, fl->fl_owner); 653 if (lsp == NULL) 654 return -ENOMEM; 655 fl->fl_u.nfs4_fl.owner = lsp; 656 fl->fl_ops = &nfs4_fl_lock_ops; 657 return 0; 658 } 659 660 /* 661 * Byte-range lock aware utility to initialize the stateid of read/write 662 * requests. 663 */ 664 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) 665 { 666 struct nfs4_lock_state *lsp; 667 int seq; 668 669 do { 670 seq = read_seqbegin(&state->seqlock); 671 memcpy(dst, &state->stateid, sizeof(*dst)); 672 } while (read_seqretry(&state->seqlock, seq)); 673 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) 674 return; 675 676 spin_lock(&state->state_lock); 677 lsp = __nfs4_find_lock_state(state, fl_owner); 678 if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) 679 memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); 680 spin_unlock(&state->state_lock); 681 nfs4_put_lock_state(lsp); 682 } 683 684 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) 685 { 686 struct nfs_seqid *new; 687 688 new = kmalloc(sizeof(*new), GFP_KERNEL); 689 if (new != NULL) { 690 new->sequence = counter; 691 INIT_LIST_HEAD(&new->list); 692 } 693 return new; 694 } 695 696 void nfs_free_seqid(struct nfs_seqid *seqid) 697 { 698 if (!list_empty(&seqid->list)) { 699 struct rpc_sequence *sequence = seqid->sequence->sequence; 700 701 spin_lock(&sequence->lock); 702 list_del(&seqid->list); 703 spin_unlock(&sequence->lock); 704 rpc_wake_up(&sequence->wait); 705 } 706 kfree(seqid); 707 } 708 709 /* 710 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or 711 * failed with a seqid incrementing error - 712 * see comments nfs_fs.h:seqid_mutating_error() 713 */ 714 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) 715 { 716 BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); 717 switch (status) { 718 case 0: 719 break; 720 case -NFS4ERR_BAD_SEQID: 721 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) 722 return; 723 printk(KERN_WARNING "NFS: v4 server returned a bad" 724 " sequence-id error on an" 725 " unconfirmed sequence %p!\n", 726 seqid->sequence); 727 case -NFS4ERR_STALE_CLIENTID: 728 case -NFS4ERR_STALE_STATEID: 729 case -NFS4ERR_BAD_STATEID: 730 case -NFS4ERR_BADXDR: 731 case -NFS4ERR_RESOURCE: 732 case -NFS4ERR_NOFILEHANDLE: 733 /* Non-seqid mutating errors */ 734 return; 735 }; 736 /* 737 * Note: no locking needed as we are guaranteed to be first 738 * on the sequence list 739 */ 740 seqid->sequence->counter++; 741 } 742 743 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) 744 { 745 struct nfs4_state_owner *sp = container_of(seqid->sequence, 746 struct nfs4_state_owner, so_seqid); 747 struct nfs_server *server = sp->so_server; 748 749 if (status == -NFS4ERR_BAD_SEQID) 750 nfs4_drop_state_owner(sp); 751 if (!nfs4_has_session(server->nfs_client)) 752 nfs_increment_seqid(status, seqid); 753 } 754 755 /* 756 * Increment the seqid if the LOCK/LOCKU succeeded, or 757 * failed with a seqid incrementing error - 758 * see comments nfs_fs.h:seqid_mutating_error() 759 */ 760 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) 761 { 762 nfs_increment_seqid(status, seqid); 763 } 764 765 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) 766 { 767 struct rpc_sequence *sequence = seqid->sequence->sequence; 768 int status = 0; 769 770 spin_lock(&sequence->lock); 771 if (list_empty(&seqid->list)) 772 list_add_tail(&seqid->list, &sequence->list); 773 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) 774 goto unlock; 775 rpc_sleep_on(&sequence->wait, task, NULL); 776 status = -EAGAIN; 777 unlock: 778 spin_unlock(&sequence->lock); 779 return status; 780 } 781 782 static int nfs4_run_state_manager(void *); 783 784 static void nfs4_clear_state_manager_bit(struct nfs_client *clp) 785 { 786 smp_mb__before_clear_bit(); 787 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); 788 smp_mb__after_clear_bit(); 789 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); 790 rpc_wake_up(&clp->cl_rpcwaitq); 791 } 792 793 /* 794 * Schedule the nfs_client asynchronous state management routine 795 */ 796 void nfs4_schedule_state_manager(struct nfs_client *clp) 797 { 798 struct task_struct *task; 799 800 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) 801 return; 802 __module_get(THIS_MODULE); 803 atomic_inc(&clp->cl_count); 804 task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", 805 rpc_peeraddr2str(clp->cl_rpcclient, 806 RPC_DISPLAY_ADDR)); 807 if (!IS_ERR(task)) 808 return; 809 nfs4_clear_state_manager_bit(clp); 810 nfs_put_client(clp); 811 module_put(THIS_MODULE); 812 } 813 814 /* 815 * Schedule a state recovery attempt 816 */ 817 void nfs4_schedule_state_recovery(struct nfs_client *clp) 818 { 819 if (!clp) 820 return; 821 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) 822 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); 823 nfs4_schedule_state_manager(clp); 824 } 825 826 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) 827 { 828 829 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); 830 /* Don't recover state that expired before the reboot */ 831 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { 832 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); 833 return 0; 834 } 835 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); 836 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); 837 return 1; 838 } 839 840 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) 841 { 842 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); 843 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); 844 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); 845 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); 846 return 1; 847 } 848 849 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) 850 { 851 struct inode *inode = state->inode; 852 struct nfs_inode *nfsi = NFS_I(inode); 853 struct file_lock *fl; 854 int status = 0; 855 856 if (inode->i_flock == NULL) 857 return 0; 858 859 /* Guard against delegation returns and new lock/unlock calls */ 860 down_write(&nfsi->rwsem); 861 /* Protect inode->i_flock using the BKL */ 862 lock_kernel(); 863 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { 864 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) 865 continue; 866 if (nfs_file_open_context(fl->fl_file)->state != state) 867 continue; 868 unlock_kernel(); 869 status = ops->recover_lock(state, fl); 870 switch (status) { 871 case 0: 872 break; 873 case -ESTALE: 874 case -NFS4ERR_ADMIN_REVOKED: 875 case -NFS4ERR_STALE_STATEID: 876 case -NFS4ERR_BAD_STATEID: 877 case -NFS4ERR_EXPIRED: 878 case -NFS4ERR_NO_GRACE: 879 case -NFS4ERR_STALE_CLIENTID: 880 goto out; 881 default: 882 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", 883 __func__, status); 884 case -ENOMEM: 885 case -NFS4ERR_DENIED: 886 case -NFS4ERR_RECLAIM_BAD: 887 case -NFS4ERR_RECLAIM_CONFLICT: 888 /* kill_proc(fl->fl_pid, SIGLOST, 1); */ 889 status = 0; 890 } 891 lock_kernel(); 892 } 893 unlock_kernel(); 894 out: 895 up_write(&nfsi->rwsem); 896 return status; 897 } 898 899 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) 900 { 901 struct nfs4_state *state; 902 struct nfs4_lock_state *lock; 903 int status = 0; 904 905 /* Note: we rely on the sp->so_states list being ordered 906 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) 907 * states first. 908 * This is needed to ensure that the server won't give us any 909 * read delegations that we have to return if, say, we are 910 * recovering after a network partition or a reboot from a 911 * server that doesn't support a grace period. 912 */ 913 restart: 914 spin_lock(&sp->so_lock); 915 list_for_each_entry(state, &sp->so_states, open_states) { 916 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) 917 continue; 918 if (state->state == 0) 919 continue; 920 atomic_inc(&state->count); 921 spin_unlock(&sp->so_lock); 922 status = ops->recover_open(sp, state); 923 if (status >= 0) { 924 status = nfs4_reclaim_locks(state, ops); 925 if (status >= 0) { 926 list_for_each_entry(lock, &state->lock_states, ls_locks) { 927 if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) 928 printk("%s: Lock reclaim failed!\n", 929 __func__); 930 } 931 nfs4_put_open_state(state); 932 goto restart; 933 } 934 } 935 switch (status) { 936 default: 937 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", 938 __func__, status); 939 case -ENOENT: 940 case -ENOMEM: 941 case -ESTALE: 942 /* 943 * Open state on this file cannot be recovered 944 * All we can do is revert to using the zero stateid. 945 */ 946 memset(state->stateid.data, 0, 947 sizeof(state->stateid.data)); 948 /* Mark the file as being 'closed' */ 949 state->state = 0; 950 break; 951 case -NFS4ERR_ADMIN_REVOKED: 952 case -NFS4ERR_STALE_STATEID: 953 case -NFS4ERR_BAD_STATEID: 954 case -NFS4ERR_RECLAIM_BAD: 955 case -NFS4ERR_RECLAIM_CONFLICT: 956 nfs4_state_mark_reclaim_nograce(sp->so_client, state); 957 break; 958 case -NFS4ERR_EXPIRED: 959 case -NFS4ERR_NO_GRACE: 960 nfs4_state_mark_reclaim_nograce(sp->so_client, state); 961 case -NFS4ERR_STALE_CLIENTID: 962 goto out_err; 963 } 964 nfs4_put_open_state(state); 965 goto restart; 966 } 967 spin_unlock(&sp->so_lock); 968 return 0; 969 out_err: 970 nfs4_put_open_state(state); 971 return status; 972 } 973 974 static void nfs4_clear_open_state(struct nfs4_state *state) 975 { 976 struct nfs4_lock_state *lock; 977 978 clear_bit(NFS_DELEGATED_STATE, &state->flags); 979 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 980 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 981 clear_bit(NFS_O_RDWR_STATE, &state->flags); 982 list_for_each_entry(lock, &state->lock_states, ls_locks) { 983 lock->ls_seqid.flags = 0; 984 lock->ls_flags &= ~NFS_LOCK_INITIALIZED; 985 } 986 } 987 988 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) 989 { 990 struct nfs4_state_owner *sp; 991 struct rb_node *pos; 992 struct nfs4_state *state; 993 994 /* Reset all sequence ids to zero */ 995 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { 996 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); 997 sp->so_seqid.flags = 0; 998 spin_lock(&sp->so_lock); 999 list_for_each_entry(state, &sp->so_states, open_states) { 1000 if (mark_reclaim(clp, state)) 1001 nfs4_clear_open_state(state); 1002 } 1003 spin_unlock(&sp->so_lock); 1004 } 1005 } 1006 1007 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) 1008 { 1009 /* Mark all delegations for reclaim */ 1010 nfs_delegation_mark_reclaim(clp); 1011 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); 1012 } 1013 1014 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) 1015 { 1016 struct nfs4_state_owner *sp; 1017 struct rb_node *pos; 1018 struct nfs4_state *state; 1019 1020 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) 1021 return; 1022 1023 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { 1024 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); 1025 spin_lock(&sp->so_lock); 1026 list_for_each_entry(state, &sp->so_states, open_states) { 1027 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) 1028 continue; 1029 nfs4_state_mark_reclaim_nograce(clp, state); 1030 } 1031 spin_unlock(&sp->so_lock); 1032 } 1033 1034 nfs_delegation_reap_unclaimed(clp); 1035 } 1036 1037 static void nfs_delegation_clear_all(struct nfs_client *clp) 1038 { 1039 nfs_delegation_mark_reclaim(clp); 1040 nfs_delegation_reap_unclaimed(clp); 1041 } 1042 1043 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) 1044 { 1045 nfs_delegation_clear_all(clp); 1046 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); 1047 } 1048 1049 static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp) 1050 { 1051 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); 1052 } 1053 1054 static void nfs4_recovery_handle_error(struct nfs_client *clp, int error) 1055 { 1056 switch (error) { 1057 case -NFS4ERR_CB_PATH_DOWN: 1058 nfs_handle_cb_pathdown(clp); 1059 break; 1060 case -NFS4ERR_STALE_CLIENTID: 1061 case -NFS4ERR_LEASE_MOVED: 1062 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); 1063 nfs4_state_start_reclaim_reboot(clp); 1064 break; 1065 case -NFS4ERR_EXPIRED: 1066 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); 1067 nfs4_state_start_reclaim_nograce(clp); 1068 case -NFS4ERR_BADSESSION: 1069 case -NFS4ERR_BADSLOT: 1070 case -NFS4ERR_BAD_HIGH_SLOT: 1071 case -NFS4ERR_DEADSESSION: 1072 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1073 case -NFS4ERR_SEQ_FALSE_RETRY: 1074 case -NFS4ERR_SEQ_MISORDERED: 1075 set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); 1076 } 1077 } 1078 1079 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) 1080 { 1081 struct rb_node *pos; 1082 int status = 0; 1083 1084 restart: 1085 spin_lock(&clp->cl_lock); 1086 for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { 1087 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); 1088 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) 1089 continue; 1090 atomic_inc(&sp->so_count); 1091 spin_unlock(&clp->cl_lock); 1092 status = nfs4_reclaim_open_state(sp, ops); 1093 if (status < 0) { 1094 set_bit(ops->owner_flag_bit, &sp->so_flags); 1095 nfs4_put_state_owner(sp); 1096 nfs4_recovery_handle_error(clp, status); 1097 return status; 1098 } 1099 nfs4_put_state_owner(sp); 1100 goto restart; 1101 } 1102 spin_unlock(&clp->cl_lock); 1103 return status; 1104 } 1105 1106 static int nfs4_check_lease(struct nfs_client *clp) 1107 { 1108 struct rpc_cred *cred; 1109 struct nfs4_state_maintenance_ops *ops = 1110 nfs4_state_renewal_ops[clp->cl_minorversion]; 1111 int status = -NFS4ERR_EXPIRED; 1112 1113 /* Is the client already known to have an expired lease? */ 1114 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) 1115 return 0; 1116 spin_lock(&clp->cl_lock); 1117 cred = ops->get_state_renewal_cred_locked(clp); 1118 spin_unlock(&clp->cl_lock); 1119 if (cred == NULL) { 1120 cred = nfs4_get_setclientid_cred(clp); 1121 if (cred == NULL) 1122 goto out; 1123 } 1124 status = ops->renew_lease(clp, cred); 1125 put_rpccred(cred); 1126 out: 1127 nfs4_recovery_handle_error(clp, status); 1128 return status; 1129 } 1130 1131 static int nfs4_reclaim_lease(struct nfs_client *clp) 1132 { 1133 struct rpc_cred *cred; 1134 struct nfs4_state_recovery_ops *ops = 1135 nfs4_reboot_recovery_ops[clp->cl_minorversion]; 1136 int status = -ENOENT; 1137 1138 cred = ops->get_clid_cred(clp); 1139 if (cred != NULL) { 1140 status = ops->establish_clid(clp, cred); 1141 put_rpccred(cred); 1142 /* Handle case where the user hasn't set up machine creds */ 1143 if (status == -EACCES && cred == clp->cl_machine_cred) { 1144 nfs4_clear_machine_cred(clp); 1145 status = -EAGAIN; 1146 } 1147 if (status == -NFS4ERR_MINOR_VERS_MISMATCH) 1148 status = -EPROTONOSUPPORT; 1149 } 1150 return status; 1151 } 1152 1153 #ifdef CONFIG_NFS_V4_1 1154 static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err) 1155 { 1156 switch (err) { 1157 case -NFS4ERR_STALE_CLIENTID: 1158 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); 1159 set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); 1160 } 1161 } 1162 1163 static int nfs4_reset_session(struct nfs_client *clp) 1164 { 1165 int status; 1166 1167 status = nfs4_proc_destroy_session(clp->cl_session); 1168 if (status && status != -NFS4ERR_BADSESSION && 1169 status != -NFS4ERR_DEADSESSION) { 1170 nfs4_session_recovery_handle_error(clp, status); 1171 goto out; 1172 } 1173 1174 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); 1175 status = nfs4_proc_create_session(clp, 1); 1176 if (status) 1177 nfs4_session_recovery_handle_error(clp, status); 1178 /* fall through*/ 1179 out: 1180 /* Wake up the next rpc task even on error */ 1181 rpc_wake_up_next(&clp->cl_session->fc_slot_table.slot_tbl_waitq); 1182 return status; 1183 } 1184 1185 static int nfs4_initialize_session(struct nfs_client *clp) 1186 { 1187 int status; 1188 1189 status = nfs4_proc_create_session(clp, 0); 1190 if (!status) { 1191 nfs_mark_client_ready(clp, NFS_CS_READY); 1192 } else if (status == -NFS4ERR_STALE_CLIENTID) { 1193 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); 1194 set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state); 1195 } else { 1196 nfs_mark_client_ready(clp, status); 1197 } 1198 return status; 1199 } 1200 #else /* CONFIG_NFS_V4_1 */ 1201 static int nfs4_reset_session(struct nfs_client *clp) { return 0; } 1202 static int nfs4_initialize_session(struct nfs_client *clp) { return 0; } 1203 #endif /* CONFIG_NFS_V4_1 */ 1204 1205 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors 1206 * on EXCHANGE_ID for v4.1 1207 */ 1208 static void nfs4_set_lease_expired(struct nfs_client *clp, int status) 1209 { 1210 if (nfs4_has_session(clp)) { 1211 switch (status) { 1212 case -NFS4ERR_DELAY: 1213 case -NFS4ERR_CLID_INUSE: 1214 case -EAGAIN: 1215 break; 1216 1217 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery 1218 * in nfs4_exchange_id */ 1219 default: 1220 return; 1221 } 1222 } 1223 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); 1224 } 1225 1226 static void nfs4_state_manager(struct nfs_client *clp) 1227 { 1228 int status = 0; 1229 1230 /* Ensure exclusive access to NFSv4 state */ 1231 for(;;) { 1232 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { 1233 /* We're going to have to re-establish a clientid */ 1234 status = nfs4_reclaim_lease(clp); 1235 if (status) { 1236 nfs4_set_lease_expired(clp, status); 1237 if (status == -EAGAIN) 1238 continue; 1239 if (clp->cl_cons_state == 1240 NFS_CS_SESSION_INITING) 1241 nfs_mark_client_ready(clp, status); 1242 goto out_error; 1243 } 1244 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); 1245 } 1246 1247 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { 1248 status = nfs4_check_lease(clp); 1249 if (status != 0) 1250 continue; 1251 } 1252 /* Initialize or reset the session */ 1253 if (test_and_clear_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state) 1254 && nfs4_has_session(clp)) { 1255 if (clp->cl_cons_state == NFS_CS_SESSION_INITING) 1256 status = nfs4_initialize_session(clp); 1257 else 1258 status = nfs4_reset_session(clp); 1259 if (status) { 1260 if (status == -NFS4ERR_STALE_CLIENTID) 1261 continue; 1262 goto out_error; 1263 } 1264 } 1265 /* First recover reboot state... */ 1266 if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { 1267 status = nfs4_do_reclaim(clp, 1268 nfs4_reboot_recovery_ops[clp->cl_minorversion]); 1269 if (status == -NFS4ERR_STALE_CLIENTID) 1270 continue; 1271 if (test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) 1272 continue; 1273 nfs4_state_end_reclaim_reboot(clp); 1274 continue; 1275 } 1276 1277 /* Now recover expired state... */ 1278 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { 1279 status = nfs4_do_reclaim(clp, 1280 nfs4_nograce_recovery_ops[clp->cl_minorversion]); 1281 if (status < 0) { 1282 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); 1283 if (status == -NFS4ERR_STALE_CLIENTID) 1284 continue; 1285 if (status == -NFS4ERR_EXPIRED) 1286 continue; 1287 if (test_bit(NFS4CLNT_SESSION_SETUP, 1288 &clp->cl_state)) 1289 continue; 1290 goto out_error; 1291 } else 1292 nfs4_state_end_reclaim_nograce(clp); 1293 continue; 1294 } 1295 1296 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { 1297 nfs_client_return_marked_delegations(clp); 1298 continue; 1299 } 1300 1301 nfs4_clear_state_manager_bit(clp); 1302 /* Did we race with an attempt to give us more work? */ 1303 if (clp->cl_state == 0) 1304 break; 1305 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) 1306 break; 1307 } 1308 return; 1309 out_error: 1310 printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" 1311 " with error %d\n", clp->cl_hostname, -status); 1312 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) 1313 nfs4_state_end_reclaim_reboot(clp); 1314 nfs4_clear_state_manager_bit(clp); 1315 } 1316 1317 static int nfs4_run_state_manager(void *ptr) 1318 { 1319 struct nfs_client *clp = ptr; 1320 1321 allow_signal(SIGKILL); 1322 nfs4_state_manager(clp); 1323 nfs_put_client(clp); 1324 module_put_and_exit(0); 1325 return 0; 1326 } 1327 1328 /* 1329 * Local variables: 1330 * c-basic-offset: 8 1331 * End: 1332 */ 1333