1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * dlmunlock.c 5 * 6 * underlying calls for unlocking locks 7 * 8 * Copyright (C) 2004 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 * 25 */ 26 27 28 #include <linux/module.h> 29 #include <linux/fs.h> 30 #include <linux/types.h> 31 #include <linux/slab.h> 32 #include <linux/highmem.h> 33 #include <linux/utsname.h> 34 #include <linux/init.h> 35 #include <linux/sysctl.h> 36 #include <linux/random.h> 37 #include <linux/blkdev.h> 38 #include <linux/socket.h> 39 #include <linux/inet.h> 40 #include <linux/spinlock.h> 41 #include <linux/delay.h> 42 43 #include "cluster/heartbeat.h" 44 #include "cluster/nodemanager.h" 45 #include "cluster/tcp.h" 46 47 #include "dlmapi.h" 48 #include "dlmcommon.h" 49 50 #define MLOG_MASK_PREFIX ML_DLM 51 #include "cluster/masklog.h" 52 53 #define DLM_UNLOCK_FREE_LOCK 0x00000001 54 #define DLM_UNLOCK_CALL_AST 0x00000002 55 #define DLM_UNLOCK_REMOVE_LOCK 0x00000004 56 #define DLM_UNLOCK_REGRANT_LOCK 0x00000008 57 #define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010 58 59 60 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 61 struct dlm_lock_resource *res, 62 struct dlm_lock *lock, 63 struct dlm_lockstatus *lksb, 64 int *actions); 65 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 66 struct dlm_lock_resource *res, 67 struct dlm_lock *lock, 68 struct dlm_lockstatus *lksb, 69 int *actions); 70 71 static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, 72 struct dlm_lock_resource *res, 73 struct dlm_lock *lock, 74 struct dlm_lockstatus *lksb, 75 int flags, 76 u8 owner); 77 78 79 /* 80 * according to the spec: 81 * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf 82 * 83 * flags & LKM_CANCEL != 0: must be converting or blocked 84 * flags & LKM_CANCEL == 0: must be granted 85 * 86 * So to unlock a converting lock, you must first cancel the 87 * convert (passing LKM_CANCEL in flags), then call the unlock 88 * again (with no LKM_CANCEL in flags). 89 */ 90 91 92 /* 93 * locking: 94 * caller needs: none 95 * taken: res->spinlock and lock->spinlock taken and dropped 96 * held on exit: none 97 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network 98 * all callers should have taken an extra ref on lock coming in 99 */ 100 static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm, 101 struct dlm_lock_resource *res, 102 struct dlm_lock *lock, 103 struct dlm_lockstatus *lksb, 104 int flags, int *call_ast, 105 int master_node) 106 { 107 enum dlm_status status; 108 int actions = 0; 109 int in_use; 110 u8 owner; 111 112 mlog(0, "master_node = %d, valblk = %d\n", master_node, 113 flags & LKM_VALBLK); 114 115 if (master_node) 116 BUG_ON(res->owner != dlm->node_num); 117 else 118 BUG_ON(res->owner == dlm->node_num); 119 120 spin_lock(&dlm->spinlock); 121 /* We want to be sure that we're not freeing a lock 122 * that still has AST's pending... */ 123 in_use = !list_empty(&lock->ast_list); 124 spin_unlock(&dlm->spinlock); 125 if (in_use) { 126 mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock " 127 "while waiting for an ast!", res->lockname.len, 128 res->lockname.name); 129 return DLM_BADPARAM; 130 } 131 132 spin_lock(&res->spinlock); 133 if (res->state & DLM_LOCK_RES_IN_PROGRESS) { 134 if (master_node) { 135 mlog(ML_ERROR, "lockres in progress!\n"); 136 spin_unlock(&res->spinlock); 137 return DLM_FORWARD; 138 } 139 /* ok for this to sleep if not in a network handler */ 140 __dlm_wait_on_lockres(res); 141 res->state |= DLM_LOCK_RES_IN_PROGRESS; 142 } 143 spin_lock(&lock->spinlock); 144 145 if (res->state & DLM_LOCK_RES_RECOVERING) { 146 status = DLM_RECOVERING; 147 goto leave; 148 } 149 150 151 /* see above for what the spec says about 152 * LKM_CANCEL and the lock queue state */ 153 if (flags & LKM_CANCEL) 154 status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions); 155 else 156 status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions); 157 158 if (status != DLM_NORMAL) 159 goto leave; 160 161 /* By now this has been masked out of cancel requests. */ 162 if (flags & LKM_VALBLK) { 163 /* make the final update to the lvb */ 164 if (master_node) 165 memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN); 166 else 167 flags |= LKM_PUT_LVB; /* let the send function 168 * handle it. */ 169 } 170 171 if (!master_node) { 172 owner = res->owner; 173 /* drop locks and send message */ 174 if (flags & LKM_CANCEL) 175 lock->cancel_pending = 1; 176 else 177 lock->unlock_pending = 1; 178 spin_unlock(&lock->spinlock); 179 spin_unlock(&res->spinlock); 180 status = dlm_send_remote_unlock_request(dlm, res, lock, lksb, 181 flags, owner); 182 spin_lock(&res->spinlock); 183 spin_lock(&lock->spinlock); 184 /* if the master told us the lock was already granted, 185 * let the ast handle all of these actions */ 186 if (status == DLM_NORMAL && 187 lksb->status == DLM_CANCELGRANT) { 188 actions &= ~(DLM_UNLOCK_REMOVE_LOCK| 189 DLM_UNLOCK_REGRANT_LOCK| 190 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 191 } else if (status == DLM_RECOVERING || 192 status == DLM_MIGRATING || 193 status == DLM_FORWARD) { 194 /* must clear the actions because this unlock 195 * is about to be retried. cannot free or do 196 * any list manipulation. */ 197 mlog(0, "%s:%.*s: clearing actions, %s\n", 198 dlm->name, res->lockname.len, 199 res->lockname.name, 200 status==DLM_RECOVERING?"recovering": 201 (status==DLM_MIGRATING?"migrating": 202 "forward")); 203 actions = 0; 204 } 205 if (flags & LKM_CANCEL) 206 lock->cancel_pending = 0; 207 else 208 lock->unlock_pending = 0; 209 210 } 211 212 /* get an extra ref on lock. if we are just switching 213 * lists here, we dont want the lock to go away. */ 214 dlm_lock_get(lock); 215 216 if (actions & DLM_UNLOCK_REMOVE_LOCK) { 217 list_del_init(&lock->list); 218 dlm_lock_put(lock); 219 } 220 if (actions & DLM_UNLOCK_REGRANT_LOCK) { 221 dlm_lock_get(lock); 222 list_add_tail(&lock->list, &res->granted); 223 } 224 if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) { 225 mlog(0, "clearing convert_type at %smaster node\n", 226 master_node ? "" : "non-"); 227 lock->ml.convert_type = LKM_IVMODE; 228 } 229 230 /* remove the extra ref on lock */ 231 dlm_lock_put(lock); 232 233 leave: 234 res->state &= ~DLM_LOCK_RES_IN_PROGRESS; 235 if (!dlm_lock_on_list(&res->converting, lock)) 236 BUG_ON(lock->ml.convert_type != LKM_IVMODE); 237 else 238 BUG_ON(lock->ml.convert_type == LKM_IVMODE); 239 spin_unlock(&lock->spinlock); 240 spin_unlock(&res->spinlock); 241 wake_up(&res->wq); 242 243 /* let the caller's final dlm_lock_put handle the actual kfree */ 244 if (actions & DLM_UNLOCK_FREE_LOCK) { 245 /* this should always be coupled with list removal */ 246 BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK)); 247 mlog(0, "lock %u:%llu should be gone now! refs=%d\n", 248 dlm_get_lock_cookie_node(lock->ml.cookie), 249 dlm_get_lock_cookie_seq(lock->ml.cookie), 250 atomic_read(&lock->lock_refs.refcount)-1); 251 dlm_lock_put(lock); 252 } 253 if (actions & DLM_UNLOCK_CALL_AST) 254 *call_ast = 1; 255 256 /* if cancel or unlock succeeded, lvb work is done */ 257 if (status == DLM_NORMAL) 258 lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB); 259 260 return status; 261 } 262 263 void dlm_commit_pending_unlock(struct dlm_lock_resource *res, 264 struct dlm_lock *lock) 265 { 266 /* leave DLM_LKSB_PUT_LVB on the lksb so any final 267 * update of the lvb will be sent to the new master */ 268 list_del_init(&lock->list); 269 } 270 271 void dlm_commit_pending_cancel(struct dlm_lock_resource *res, 272 struct dlm_lock *lock) 273 { 274 list_del_init(&lock->list); 275 list_add_tail(&lock->list, &res->granted); 276 lock->ml.convert_type = LKM_IVMODE; 277 } 278 279 280 static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm, 281 struct dlm_lock_resource *res, 282 struct dlm_lock *lock, 283 struct dlm_lockstatus *lksb, 284 int flags, 285 int *call_ast) 286 { 287 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1); 288 } 289 290 static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm, 291 struct dlm_lock_resource *res, 292 struct dlm_lock *lock, 293 struct dlm_lockstatus *lksb, 294 int flags, int *call_ast) 295 { 296 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0); 297 } 298 299 /* 300 * locking: 301 * caller needs: none 302 * taken: none 303 * held on exit: none 304 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network 305 */ 306 static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, 307 struct dlm_lock_resource *res, 308 struct dlm_lock *lock, 309 struct dlm_lockstatus *lksb, 310 int flags, 311 u8 owner) 312 { 313 struct dlm_unlock_lock unlock; 314 int tmpret; 315 enum dlm_status ret; 316 int status = 0; 317 struct kvec vec[2]; 318 size_t veclen = 1; 319 320 mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); 321 322 memset(&unlock, 0, sizeof(unlock)); 323 unlock.node_idx = dlm->node_num; 324 unlock.flags = cpu_to_be32(flags); 325 unlock.cookie = lock->ml.cookie; 326 unlock.namelen = res->lockname.len; 327 memcpy(unlock.name, res->lockname.name, unlock.namelen); 328 329 vec[0].iov_len = sizeof(struct dlm_unlock_lock); 330 vec[0].iov_base = &unlock; 331 332 if (flags & LKM_PUT_LVB) { 333 /* extra data to send if we are updating lvb */ 334 vec[1].iov_len = DLM_LVB_LEN; 335 vec[1].iov_base = lock->lksb->lvb; 336 veclen++; 337 } 338 339 tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key, 340 vec, veclen, owner, &status); 341 if (tmpret >= 0) { 342 // successfully sent and received 343 if (status == DLM_CANCELGRANT) 344 ret = DLM_NORMAL; 345 else if (status == DLM_FORWARD) { 346 mlog(0, "master was in-progress. retry\n"); 347 ret = DLM_FORWARD; 348 } else 349 ret = status; 350 lksb->status = status; 351 } else { 352 mlog_errno(tmpret); 353 if (dlm_is_host_down(tmpret)) { 354 /* NOTE: this seems strange, but it is what we want. 355 * when the master goes down during a cancel or 356 * unlock, the recovery code completes the operation 357 * as if the master had not died, then passes the 358 * updated state to the recovery master. this thread 359 * just needs to finish out the operation and call 360 * the unlockast. */ 361 ret = DLM_NORMAL; 362 } else { 363 /* something bad. this will BUG in ocfs2 */ 364 ret = dlm_err_to_dlm_status(tmpret); 365 } 366 lksb->status = ret; 367 } 368 369 return ret; 370 } 371 372 /* 373 * locking: 374 * caller needs: none 375 * taken: takes and drops res->spinlock 376 * held on exit: none 377 * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID, 378 * return value from dlmunlock_master 379 */ 380 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data) 381 { 382 struct dlm_ctxt *dlm = data; 383 struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf; 384 struct dlm_lock_resource *res = NULL; 385 struct list_head *iter; 386 struct dlm_lock *lock = NULL; 387 enum dlm_status status = DLM_NORMAL; 388 int found = 0, i; 389 struct dlm_lockstatus *lksb = NULL; 390 int ignore; 391 u32 flags; 392 struct list_head *queue; 393 394 flags = be32_to_cpu(unlock->flags); 395 396 if (flags & LKM_GET_LVB) { 397 mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n"); 398 return DLM_BADARGS; 399 } 400 401 if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) { 402 mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL " 403 "request!\n"); 404 return DLM_BADARGS; 405 } 406 407 if (unlock->namelen > DLM_LOCKID_NAME_MAX) { 408 mlog(ML_ERROR, "Invalid name length in unlock handler!\n"); 409 return DLM_IVBUFLEN; 410 } 411 412 if (!dlm_grab(dlm)) 413 return DLM_REJECTED; 414 415 mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), 416 "Domain %s not fully joined!\n", dlm->name); 417 418 mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none"); 419 420 res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen); 421 if (!res) { 422 /* We assume here that a no lock resource simply means 423 * it was migrated away and destroyed before the other 424 * node could detect it. */ 425 mlog(0, "returning DLM_FORWARD -- res no longer exists\n"); 426 status = DLM_FORWARD; 427 goto not_found; 428 } 429 430 queue=&res->granted; 431 found = 0; 432 spin_lock(&res->spinlock); 433 if (res->state & DLM_LOCK_RES_RECOVERING) { 434 spin_unlock(&res->spinlock); 435 mlog(0, "returning DLM_RECOVERING\n"); 436 status = DLM_RECOVERING; 437 goto leave; 438 } 439 440 if (res->state & DLM_LOCK_RES_MIGRATING) { 441 spin_unlock(&res->spinlock); 442 mlog(0, "returning DLM_MIGRATING\n"); 443 status = DLM_MIGRATING; 444 goto leave; 445 } 446 447 if (res->owner != dlm->node_num) { 448 spin_unlock(&res->spinlock); 449 mlog(0, "returning DLM_FORWARD -- not master\n"); 450 status = DLM_FORWARD; 451 goto leave; 452 } 453 454 for (i=0; i<3; i++) { 455 list_for_each(iter, queue) { 456 lock = list_entry(iter, struct dlm_lock, list); 457 if (lock->ml.cookie == unlock->cookie && 458 lock->ml.node == unlock->node_idx) { 459 dlm_lock_get(lock); 460 found = 1; 461 break; 462 } 463 } 464 if (found) 465 break; 466 /* scan granted -> converting -> blocked queues */ 467 queue++; 468 } 469 spin_unlock(&res->spinlock); 470 if (!found) { 471 status = DLM_IVLOCKID; 472 goto not_found; 473 } 474 475 /* lock was found on queue */ 476 lksb = lock->lksb; 477 /* unlockast only called on originating node */ 478 if (flags & LKM_PUT_LVB) { 479 lksb->flags |= DLM_LKSB_PUT_LVB; 480 memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN); 481 } 482 483 /* if this is in-progress, propagate the DLM_FORWARD 484 * all the way back out */ 485 status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore); 486 if (status == DLM_FORWARD) 487 mlog(0, "lockres is in progress\n"); 488 489 if (flags & LKM_PUT_LVB) 490 lksb->flags &= ~DLM_LKSB_PUT_LVB; 491 492 dlm_lockres_calc_usage(dlm, res); 493 dlm_kick_thread(dlm, res); 494 495 not_found: 496 if (!found) 497 mlog(ML_ERROR, "failed to find lock to unlock! " 498 "cookie=%u:%llu\n", 499 dlm_get_lock_cookie_node(unlock->cookie), 500 dlm_get_lock_cookie_seq(unlock->cookie)); 501 else { 502 /* send the lksb->status back to the other node */ 503 status = lksb->status; 504 dlm_lock_put(lock); 505 } 506 507 leave: 508 if (res) 509 dlm_lockres_put(res); 510 511 dlm_put(dlm); 512 513 return status; 514 } 515 516 517 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 518 struct dlm_lock_resource *res, 519 struct dlm_lock *lock, 520 struct dlm_lockstatus *lksb, 521 int *actions) 522 { 523 enum dlm_status status; 524 525 if (dlm_lock_on_list(&res->blocked, lock)) { 526 /* cancel this outright */ 527 lksb->status = DLM_NORMAL; 528 status = DLM_NORMAL; 529 *actions = (DLM_UNLOCK_CALL_AST | 530 DLM_UNLOCK_REMOVE_LOCK); 531 } else if (dlm_lock_on_list(&res->converting, lock)) { 532 /* cancel the request, put back on granted */ 533 lksb->status = DLM_NORMAL; 534 status = DLM_NORMAL; 535 *actions = (DLM_UNLOCK_CALL_AST | 536 DLM_UNLOCK_REMOVE_LOCK | 537 DLM_UNLOCK_REGRANT_LOCK | 538 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 539 } else if (dlm_lock_on_list(&res->granted, lock)) { 540 /* too late, already granted. DLM_CANCELGRANT */ 541 lksb->status = DLM_CANCELGRANT; 542 status = DLM_NORMAL; 543 *actions = DLM_UNLOCK_CALL_AST; 544 } else { 545 mlog(ML_ERROR, "lock to cancel is not on any list!\n"); 546 lksb->status = DLM_IVLOCKID; 547 status = DLM_IVLOCKID; 548 *actions = 0; 549 } 550 return status; 551 } 552 553 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 554 struct dlm_lock_resource *res, 555 struct dlm_lock *lock, 556 struct dlm_lockstatus *lksb, 557 int *actions) 558 { 559 enum dlm_status status; 560 561 /* unlock request */ 562 if (!dlm_lock_on_list(&res->granted, lock)) { 563 lksb->status = DLM_DENIED; 564 status = DLM_DENIED; 565 dlm_error(status); 566 *actions = 0; 567 } else { 568 /* unlock granted lock */ 569 lksb->status = DLM_NORMAL; 570 status = DLM_NORMAL; 571 *actions = (DLM_UNLOCK_FREE_LOCK | 572 DLM_UNLOCK_CALL_AST | 573 DLM_UNLOCK_REMOVE_LOCK); 574 } 575 return status; 576 } 577 578 /* there seems to be no point in doing this async 579 * since (even for the remote case) there is really 580 * no work to queue up... so just do it and fire the 581 * unlockast by hand when done... */ 582 enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb, 583 int flags, dlm_astunlockfunc_t *unlockast, void *data) 584 { 585 enum dlm_status status; 586 struct dlm_lock_resource *res; 587 struct dlm_lock *lock = NULL; 588 int call_ast, is_master; 589 590 mlog_entry_void(); 591 592 if (!lksb) { 593 dlm_error(DLM_BADARGS); 594 return DLM_BADARGS; 595 } 596 597 if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) { 598 dlm_error(DLM_BADPARAM); 599 return DLM_BADPARAM; 600 } 601 602 if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) { 603 mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n"); 604 flags &= ~LKM_VALBLK; 605 } 606 607 if (!lksb->lockid || !lksb->lockid->lockres) { 608 dlm_error(DLM_BADPARAM); 609 return DLM_BADPARAM; 610 } 611 612 lock = lksb->lockid; 613 BUG_ON(!lock); 614 dlm_lock_get(lock); 615 616 res = lock->lockres; 617 BUG_ON(!res); 618 dlm_lockres_get(res); 619 retry: 620 call_ast = 0; 621 /* need to retry up here because owner may have changed */ 622 mlog(0, "lock=%p res=%p\n", lock, res); 623 624 spin_lock(&res->spinlock); 625 is_master = (res->owner == dlm->node_num); 626 spin_unlock(&res->spinlock); 627 628 if (is_master) { 629 status = dlmunlock_master(dlm, res, lock, lksb, flags, 630 &call_ast); 631 mlog(0, "done calling dlmunlock_master: returned %d, " 632 "call_ast is %d\n", status, call_ast); 633 } else { 634 status = dlmunlock_remote(dlm, res, lock, lksb, flags, 635 &call_ast); 636 mlog(0, "done calling dlmunlock_remote: returned %d, " 637 "call_ast is %d\n", status, call_ast); 638 } 639 640 if (status == DLM_RECOVERING || 641 status == DLM_MIGRATING || 642 status == DLM_FORWARD) { 643 /* We want to go away for a tiny bit to allow recovery 644 * / migration to complete on this resource. I don't 645 * know of any wait queue we could sleep on as this 646 * may be happening on another node. Perhaps the 647 * proper solution is to queue up requests on the 648 * other end? */ 649 650 /* do we want to yield(); ?? */ 651 msleep(50); 652 653 mlog(0, "retrying unlock due to pending recovery/" 654 "migration/in-progress\n"); 655 goto retry; 656 } 657 658 if (call_ast) { 659 mlog(0, "calling unlockast(%p, %d)\n", data, lksb->status); 660 if (is_master) { 661 /* it is possible that there is one last bast 662 * pending. make sure it is flushed, then 663 * call the unlockast. 664 * not an issue if this is a mastered remotely, 665 * since this lock has been removed from the 666 * lockres queues and cannot be found. */ 667 dlm_kick_thread(dlm, NULL); 668 wait_event(dlm->ast_wq, 669 dlm_lock_basts_flushed(dlm, lock)); 670 } 671 (*unlockast)(data, lksb->status); 672 } 673 674 if (status == DLM_NORMAL) { 675 mlog(0, "kicking the thread\n"); 676 dlm_kick_thread(dlm, res); 677 } else 678 dlm_error(status); 679 680 dlm_lockres_calc_usage(dlm, res); 681 dlm_lockres_put(res); 682 dlm_lock_put(lock); 683 684 mlog(0, "returning status=%d!\n", status); 685 return status; 686 } 687 EXPORT_SYMBOL_GPL(dlmunlock); 688 689