1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* -*- mode: c; c-basic-offset: 8; -*- 3 * vim: noexpandtab sw=8 ts=8 sts=0: 4 * 5 * dlmunlock.c 6 * 7 * underlying calls for unlocking locks 8 * 9 * Copyright (C) 2004 Oracle. All rights reserved. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/fs.h> 15 #include <linux/types.h> 16 #include <linux/highmem.h> 17 #include <linux/init.h> 18 #include <linux/sysctl.h> 19 #include <linux/random.h> 20 #include <linux/blkdev.h> 21 #include <linux/socket.h> 22 #include <linux/inet.h> 23 #include <linux/spinlock.h> 24 #include <linux/delay.h> 25 26 #include "cluster/heartbeat.h" 27 #include "cluster/nodemanager.h" 28 #include "cluster/tcp.h" 29 30 #include "dlmapi.h" 31 #include "dlmcommon.h" 32 33 #define MLOG_MASK_PREFIX ML_DLM 34 #include "cluster/masklog.h" 35 36 #define DLM_UNLOCK_FREE_LOCK 0x00000001 37 #define DLM_UNLOCK_CALL_AST 0x00000002 38 #define DLM_UNLOCK_REMOVE_LOCK 0x00000004 39 #define DLM_UNLOCK_REGRANT_LOCK 0x00000008 40 #define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010 41 42 43 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 44 struct dlm_lock_resource *res, 45 struct dlm_lock *lock, 46 struct dlm_lockstatus *lksb, 47 int *actions); 48 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 49 struct dlm_lock_resource *res, 50 struct dlm_lock *lock, 51 struct dlm_lockstatus *lksb, 52 int *actions); 53 54 static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, 55 struct dlm_lock_resource *res, 56 struct dlm_lock *lock, 57 struct dlm_lockstatus *lksb, 58 int flags, 59 u8 owner); 60 61 62 /* 63 * according to the spec: 64 * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf 65 * 66 * flags & LKM_CANCEL != 0: must be converting or blocked 67 * flags & LKM_CANCEL == 0: must be granted 68 * 69 * So to unlock a converting lock, you must first cancel the 70 * convert (passing LKM_CANCEL in flags), then call the unlock 71 * again (with no LKM_CANCEL in flags). 72 */ 73 74 75 /* 76 * locking: 77 * caller needs: none 78 * taken: res->spinlock and lock->spinlock taken and dropped 79 * held on exit: none 80 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network 81 * all callers should have taken an extra ref on lock coming in 82 */ 83 static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm, 84 struct dlm_lock_resource *res, 85 struct dlm_lock *lock, 86 struct dlm_lockstatus *lksb, 87 int flags, int *call_ast, 88 int master_node) 89 { 90 enum dlm_status status; 91 int actions = 0; 92 int in_use; 93 u8 owner; 94 95 mlog(0, "master_node = %d, valblk = %d\n", master_node, 96 flags & LKM_VALBLK); 97 98 if (master_node) 99 BUG_ON(res->owner != dlm->node_num); 100 else 101 BUG_ON(res->owner == dlm->node_num); 102 103 spin_lock(&dlm->ast_lock); 104 /* We want to be sure that we're not freeing a lock 105 * that still has AST's pending... */ 106 in_use = !list_empty(&lock->ast_list); 107 spin_unlock(&dlm->ast_lock); 108 if (in_use && !(flags & LKM_CANCEL)) { 109 mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock " 110 "while waiting for an ast!", res->lockname.len, 111 res->lockname.name); 112 return DLM_BADPARAM; 113 } 114 115 spin_lock(&res->spinlock); 116 if (res->state & DLM_LOCK_RES_IN_PROGRESS) { 117 if (master_node && !(flags & LKM_CANCEL)) { 118 mlog(ML_ERROR, "lockres in progress!\n"); 119 spin_unlock(&res->spinlock); 120 return DLM_FORWARD; 121 } 122 /* ok for this to sleep if not in a network handler */ 123 __dlm_wait_on_lockres(res); 124 res->state |= DLM_LOCK_RES_IN_PROGRESS; 125 } 126 spin_lock(&lock->spinlock); 127 128 if (res->state & DLM_LOCK_RES_RECOVERING) { 129 status = DLM_RECOVERING; 130 goto leave; 131 } 132 133 if (res->state & DLM_LOCK_RES_MIGRATING) { 134 status = DLM_MIGRATING; 135 goto leave; 136 } 137 138 /* see above for what the spec says about 139 * LKM_CANCEL and the lock queue state */ 140 if (flags & LKM_CANCEL) 141 status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions); 142 else 143 status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions); 144 145 if (status != DLM_NORMAL && (status != DLM_CANCELGRANT || !master_node)) 146 goto leave; 147 148 /* By now this has been masked out of cancel requests. */ 149 if (flags & LKM_VALBLK) { 150 /* make the final update to the lvb */ 151 if (master_node) 152 memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN); 153 else 154 flags |= LKM_PUT_LVB; /* let the send function 155 * handle it. */ 156 } 157 158 if (!master_node) { 159 owner = res->owner; 160 /* drop locks and send message */ 161 if (flags & LKM_CANCEL) 162 lock->cancel_pending = 1; 163 else 164 lock->unlock_pending = 1; 165 spin_unlock(&lock->spinlock); 166 spin_unlock(&res->spinlock); 167 status = dlm_send_remote_unlock_request(dlm, res, lock, lksb, 168 flags, owner); 169 spin_lock(&res->spinlock); 170 spin_lock(&lock->spinlock); 171 /* if the master told us the lock was already granted, 172 * let the ast handle all of these actions */ 173 if (status == DLM_CANCELGRANT) { 174 actions &= ~(DLM_UNLOCK_REMOVE_LOCK| 175 DLM_UNLOCK_REGRANT_LOCK| 176 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 177 } else if (status == DLM_RECOVERING || 178 status == DLM_MIGRATING || 179 status == DLM_FORWARD || 180 status == DLM_NOLOCKMGR 181 ) { 182 /* must clear the actions because this unlock 183 * is about to be retried. cannot free or do 184 * any list manipulation. */ 185 mlog(0, "%s:%.*s: clearing actions, %s\n", 186 dlm->name, res->lockname.len, 187 res->lockname.name, 188 status==DLM_RECOVERING?"recovering": 189 (status==DLM_MIGRATING?"migrating": 190 (status == DLM_FORWARD ? "forward" : 191 "nolockmanager"))); 192 actions = 0; 193 } 194 if (flags & LKM_CANCEL) 195 lock->cancel_pending = 0; 196 else 197 lock->unlock_pending = 0; 198 199 } 200 201 /* get an extra ref on lock. if we are just switching 202 * lists here, we dont want the lock to go away. */ 203 dlm_lock_get(lock); 204 205 if (actions & DLM_UNLOCK_REMOVE_LOCK) { 206 list_del_init(&lock->list); 207 dlm_lock_put(lock); 208 } 209 if (actions & DLM_UNLOCK_REGRANT_LOCK) { 210 dlm_lock_get(lock); 211 list_add_tail(&lock->list, &res->granted); 212 } 213 if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) { 214 mlog(0, "clearing convert_type at %smaster node\n", 215 master_node ? "" : "non-"); 216 lock->ml.convert_type = LKM_IVMODE; 217 } 218 219 /* remove the extra ref on lock */ 220 dlm_lock_put(lock); 221 222 leave: 223 res->state &= ~DLM_LOCK_RES_IN_PROGRESS; 224 if (!dlm_lock_on_list(&res->converting, lock)) 225 BUG_ON(lock->ml.convert_type != LKM_IVMODE); 226 else 227 BUG_ON(lock->ml.convert_type == LKM_IVMODE); 228 spin_unlock(&lock->spinlock); 229 spin_unlock(&res->spinlock); 230 wake_up(&res->wq); 231 232 /* let the caller's final dlm_lock_put handle the actual kfree */ 233 if (actions & DLM_UNLOCK_FREE_LOCK) { 234 /* this should always be coupled with list removal */ 235 BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK)); 236 mlog(0, "lock %u:%llu should be gone now! refs=%d\n", 237 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), 238 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), 239 kref_read(&lock->lock_refs)-1); 240 dlm_lock_put(lock); 241 } 242 if (actions & DLM_UNLOCK_CALL_AST) 243 *call_ast = 1; 244 245 /* if cancel or unlock succeeded, lvb work is done */ 246 if (status == DLM_NORMAL) 247 lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB); 248 249 return status; 250 } 251 252 void dlm_commit_pending_unlock(struct dlm_lock_resource *res, 253 struct dlm_lock *lock) 254 { 255 /* leave DLM_LKSB_PUT_LVB on the lksb so any final 256 * update of the lvb will be sent to the new master */ 257 list_del_init(&lock->list); 258 } 259 260 void dlm_commit_pending_cancel(struct dlm_lock_resource *res, 261 struct dlm_lock *lock) 262 { 263 list_move_tail(&lock->list, &res->granted); 264 lock->ml.convert_type = LKM_IVMODE; 265 } 266 267 268 static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm, 269 struct dlm_lock_resource *res, 270 struct dlm_lock *lock, 271 struct dlm_lockstatus *lksb, 272 int flags, 273 int *call_ast) 274 { 275 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1); 276 } 277 278 static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm, 279 struct dlm_lock_resource *res, 280 struct dlm_lock *lock, 281 struct dlm_lockstatus *lksb, 282 int flags, int *call_ast) 283 { 284 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0); 285 } 286 287 /* 288 * locking: 289 * caller needs: none 290 * taken: none 291 * held on exit: none 292 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network 293 */ 294 static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, 295 struct dlm_lock_resource *res, 296 struct dlm_lock *lock, 297 struct dlm_lockstatus *lksb, 298 int flags, 299 u8 owner) 300 { 301 struct dlm_unlock_lock unlock; 302 int tmpret; 303 enum dlm_status ret; 304 int status = 0; 305 struct kvec vec[2]; 306 size_t veclen = 1; 307 308 mlog(0, "%.*s\n", res->lockname.len, res->lockname.name); 309 310 if (owner == dlm->node_num) { 311 /* ended up trying to contact ourself. this means 312 * that the lockres had been remote but became local 313 * via a migration. just retry it, now as local */ 314 mlog(0, "%s:%.*s: this node became the master due to a " 315 "migration, re-evaluate now\n", dlm->name, 316 res->lockname.len, res->lockname.name); 317 return DLM_FORWARD; 318 } 319 320 memset(&unlock, 0, sizeof(unlock)); 321 unlock.node_idx = dlm->node_num; 322 unlock.flags = cpu_to_be32(flags); 323 unlock.cookie = lock->ml.cookie; 324 unlock.namelen = res->lockname.len; 325 memcpy(unlock.name, res->lockname.name, unlock.namelen); 326 327 vec[0].iov_len = sizeof(struct dlm_unlock_lock); 328 vec[0].iov_base = &unlock; 329 330 if (flags & LKM_PUT_LVB) { 331 /* extra data to send if we are updating lvb */ 332 vec[1].iov_len = DLM_LVB_LEN; 333 vec[1].iov_base = lock->lksb->lvb; 334 veclen++; 335 } 336 337 tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key, 338 vec, veclen, owner, &status); 339 if (tmpret >= 0) { 340 // successfully sent and received 341 if (status == DLM_FORWARD) 342 mlog(0, "master was in-progress. retry\n"); 343 ret = status; 344 } else { 345 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " 346 "node %u\n", tmpret, DLM_UNLOCK_LOCK_MSG, dlm->key, owner); 347 if (dlm_is_host_down(tmpret)) { 348 /* NOTE: this seems strange, but it is what we want. 349 * when the master goes down during a cancel or 350 * unlock, the recovery code completes the operation 351 * as if the master had not died, then passes the 352 * updated state to the recovery master. this thread 353 * just needs to finish out the operation and call 354 * the unlockast. */ 355 if (dlm_is_node_dead(dlm, owner)) 356 ret = DLM_NORMAL; 357 else 358 ret = DLM_NOLOCKMGR; 359 } else { 360 /* something bad. this will BUG in ocfs2 */ 361 ret = dlm_err_to_dlm_status(tmpret); 362 } 363 } 364 365 return ret; 366 } 367 368 /* 369 * locking: 370 * caller needs: none 371 * taken: takes and drops res->spinlock 372 * held on exit: none 373 * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID, 374 * return value from dlmunlock_master 375 */ 376 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data, 377 void **ret_data) 378 { 379 struct dlm_ctxt *dlm = data; 380 struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf; 381 struct dlm_lock_resource *res = NULL; 382 struct dlm_lock *lock = NULL; 383 enum dlm_status status = DLM_NORMAL; 384 int found = 0, i; 385 struct dlm_lockstatus *lksb = NULL; 386 int ignore; 387 u32 flags; 388 struct list_head *queue; 389 390 flags = be32_to_cpu(unlock->flags); 391 392 if (flags & LKM_GET_LVB) { 393 mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n"); 394 return DLM_BADARGS; 395 } 396 397 if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) { 398 mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL " 399 "request!\n"); 400 return DLM_BADARGS; 401 } 402 403 if (unlock->namelen > DLM_LOCKID_NAME_MAX) { 404 mlog(ML_ERROR, "Invalid name length in unlock handler!\n"); 405 return DLM_IVBUFLEN; 406 } 407 408 if (!dlm_grab(dlm)) 409 return DLM_FORWARD; 410 411 mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), 412 "Domain %s not fully joined!\n", dlm->name); 413 414 mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none"); 415 416 res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen); 417 if (!res) { 418 /* We assume here that a no lock resource simply means 419 * it was migrated away and destroyed before the other 420 * node could detect it. */ 421 mlog(0, "returning DLM_FORWARD -- res no longer exists\n"); 422 status = DLM_FORWARD; 423 goto not_found; 424 } 425 426 queue=&res->granted; 427 found = 0; 428 spin_lock(&res->spinlock); 429 if (res->state & DLM_LOCK_RES_RECOVERING) { 430 spin_unlock(&res->spinlock); 431 mlog(0, "returning DLM_RECOVERING\n"); 432 status = DLM_RECOVERING; 433 goto leave; 434 } 435 436 if (res->state & DLM_LOCK_RES_MIGRATING) { 437 spin_unlock(&res->spinlock); 438 mlog(0, "returning DLM_MIGRATING\n"); 439 status = DLM_MIGRATING; 440 goto leave; 441 } 442 443 if (res->owner != dlm->node_num) { 444 spin_unlock(&res->spinlock); 445 mlog(0, "returning DLM_FORWARD -- not master\n"); 446 status = DLM_FORWARD; 447 goto leave; 448 } 449 450 for (i=0; i<3; i++) { 451 list_for_each_entry(lock, queue, list) { 452 if (lock->ml.cookie == unlock->cookie && 453 lock->ml.node == unlock->node_idx) { 454 dlm_lock_get(lock); 455 found = 1; 456 break; 457 } 458 } 459 if (found) 460 break; 461 /* scan granted -> converting -> blocked queues */ 462 queue++; 463 } 464 spin_unlock(&res->spinlock); 465 if (!found) { 466 status = DLM_IVLOCKID; 467 goto not_found; 468 } 469 470 /* lock was found on queue */ 471 lksb = lock->lksb; 472 if (flags & (LKM_VALBLK|LKM_PUT_LVB) && 473 lock->ml.type != LKM_EXMODE) 474 flags &= ~(LKM_VALBLK|LKM_PUT_LVB); 475 476 /* unlockast only called on originating node */ 477 if (flags & LKM_PUT_LVB) { 478 lksb->flags |= DLM_LKSB_PUT_LVB; 479 memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN); 480 } 481 482 /* if this is in-progress, propagate the DLM_FORWARD 483 * all the way back out */ 484 status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore); 485 if (status == DLM_FORWARD) 486 mlog(0, "lockres is in progress\n"); 487 488 if (flags & LKM_PUT_LVB) 489 lksb->flags &= ~DLM_LKSB_PUT_LVB; 490 491 dlm_lockres_calc_usage(dlm, res); 492 dlm_kick_thread(dlm, res); 493 494 not_found: 495 if (!found) 496 mlog(ML_ERROR, "failed to find lock to unlock! " 497 "cookie=%u:%llu\n", 498 dlm_get_lock_cookie_node(be64_to_cpu(unlock->cookie)), 499 dlm_get_lock_cookie_seq(be64_to_cpu(unlock->cookie))); 500 else 501 dlm_lock_put(lock); 502 503 leave: 504 if (res) 505 dlm_lockres_put(res); 506 507 dlm_put(dlm); 508 509 return status; 510 } 511 512 513 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 514 struct dlm_lock_resource *res, 515 struct dlm_lock *lock, 516 struct dlm_lockstatus *lksb, 517 int *actions) 518 { 519 enum dlm_status status; 520 521 if (dlm_lock_on_list(&res->blocked, lock)) { 522 /* cancel this outright */ 523 status = DLM_NORMAL; 524 *actions = (DLM_UNLOCK_CALL_AST | 525 DLM_UNLOCK_REMOVE_LOCK); 526 } else if (dlm_lock_on_list(&res->converting, lock)) { 527 /* cancel the request, put back on granted */ 528 status = DLM_NORMAL; 529 *actions = (DLM_UNLOCK_CALL_AST | 530 DLM_UNLOCK_REMOVE_LOCK | 531 DLM_UNLOCK_REGRANT_LOCK | 532 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 533 } else if (dlm_lock_on_list(&res->granted, lock)) { 534 /* too late, already granted. */ 535 status = DLM_CANCELGRANT; 536 *actions = DLM_UNLOCK_CALL_AST; 537 } else { 538 mlog(ML_ERROR, "lock to cancel is not on any list!\n"); 539 status = DLM_IVLOCKID; 540 *actions = 0; 541 } 542 return status; 543 } 544 545 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 546 struct dlm_lock_resource *res, 547 struct dlm_lock *lock, 548 struct dlm_lockstatus *lksb, 549 int *actions) 550 { 551 enum dlm_status status; 552 553 /* unlock request */ 554 if (!dlm_lock_on_list(&res->granted, lock)) { 555 status = DLM_DENIED; 556 dlm_error(status); 557 *actions = 0; 558 } else { 559 /* unlock granted lock */ 560 status = DLM_NORMAL; 561 *actions = (DLM_UNLOCK_FREE_LOCK | 562 DLM_UNLOCK_CALL_AST | 563 DLM_UNLOCK_REMOVE_LOCK); 564 } 565 return status; 566 } 567 568 /* there seems to be no point in doing this async 569 * since (even for the remote case) there is really 570 * no work to queue up... so just do it and fire the 571 * unlockast by hand when done... */ 572 enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb, 573 int flags, dlm_astunlockfunc_t *unlockast, void *data) 574 { 575 enum dlm_status status; 576 struct dlm_lock_resource *res; 577 struct dlm_lock *lock = NULL; 578 int call_ast, is_master; 579 580 if (!lksb) { 581 dlm_error(DLM_BADARGS); 582 return DLM_BADARGS; 583 } 584 585 if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) { 586 dlm_error(DLM_BADPARAM); 587 return DLM_BADPARAM; 588 } 589 590 if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) { 591 mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n"); 592 flags &= ~LKM_VALBLK; 593 } 594 595 if (!lksb->lockid || !lksb->lockid->lockres) { 596 dlm_error(DLM_BADPARAM); 597 return DLM_BADPARAM; 598 } 599 600 lock = lksb->lockid; 601 BUG_ON(!lock); 602 dlm_lock_get(lock); 603 604 res = lock->lockres; 605 BUG_ON(!res); 606 dlm_lockres_get(res); 607 retry: 608 call_ast = 0; 609 /* need to retry up here because owner may have changed */ 610 mlog(0, "lock=%p res=%p\n", lock, res); 611 612 spin_lock(&res->spinlock); 613 is_master = (res->owner == dlm->node_num); 614 if (flags & LKM_VALBLK && lock->ml.type != LKM_EXMODE) 615 flags &= ~LKM_VALBLK; 616 spin_unlock(&res->spinlock); 617 618 if (is_master) { 619 status = dlmunlock_master(dlm, res, lock, lksb, flags, 620 &call_ast); 621 mlog(0, "done calling dlmunlock_master: returned %d, " 622 "call_ast is %d\n", status, call_ast); 623 } else { 624 status = dlmunlock_remote(dlm, res, lock, lksb, flags, 625 &call_ast); 626 mlog(0, "done calling dlmunlock_remote: returned %d, " 627 "call_ast is %d\n", status, call_ast); 628 } 629 630 if (status == DLM_RECOVERING || 631 status == DLM_MIGRATING || 632 status == DLM_FORWARD || 633 status == DLM_NOLOCKMGR) { 634 635 /* We want to go away for a tiny bit to allow recovery 636 * / migration to complete on this resource. I don't 637 * know of any wait queue we could sleep on as this 638 * may be happening on another node. Perhaps the 639 * proper solution is to queue up requests on the 640 * other end? */ 641 642 /* do we want to yield(); ?? */ 643 msleep(50); 644 645 mlog(0, "retrying unlock due to pending recovery/" 646 "migration/in-progress/reconnect\n"); 647 goto retry; 648 } 649 650 if (call_ast) { 651 mlog(0, "calling unlockast(%p, %d)\n", data, status); 652 if (is_master) { 653 /* it is possible that there is one last bast 654 * pending. make sure it is flushed, then 655 * call the unlockast. 656 * not an issue if this is a mastered remotely, 657 * since this lock has been removed from the 658 * lockres queues and cannot be found. */ 659 dlm_kick_thread(dlm, NULL); 660 wait_event(dlm->ast_wq, 661 dlm_lock_basts_flushed(dlm, lock)); 662 } 663 (*unlockast)(data, status); 664 } 665 666 if (status == DLM_CANCELGRANT) 667 status = DLM_NORMAL; 668 669 if (status == DLM_NORMAL) { 670 mlog(0, "kicking the thread\n"); 671 dlm_kick_thread(dlm, res); 672 } else 673 dlm_error(status); 674 675 dlm_lockres_calc_usage(dlm, res); 676 dlm_lockres_put(res); 677 dlm_lock_put(lock); 678 679 mlog(0, "returning status=%d!\n", status); 680 return status; 681 } 682 EXPORT_SYMBOL_GPL(dlmunlock); 683 684