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_move_tail(&lock->list, &res->granted); 275 lock->ml.convert_type = LKM_IVMODE; 276 } 277 278 279 static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm, 280 struct dlm_lock_resource *res, 281 struct dlm_lock *lock, 282 struct dlm_lockstatus *lksb, 283 int flags, 284 int *call_ast) 285 { 286 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1); 287 } 288 289 static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm, 290 struct dlm_lock_resource *res, 291 struct dlm_lock *lock, 292 struct dlm_lockstatus *lksb, 293 int flags, int *call_ast) 294 { 295 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0); 296 } 297 298 /* 299 * locking: 300 * caller needs: none 301 * taken: none 302 * held on exit: none 303 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network 304 */ 305 static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, 306 struct dlm_lock_resource *res, 307 struct dlm_lock *lock, 308 struct dlm_lockstatus *lksb, 309 int flags, 310 u8 owner) 311 { 312 struct dlm_unlock_lock unlock; 313 int tmpret; 314 enum dlm_status ret; 315 int status = 0; 316 struct kvec vec[2]; 317 size_t veclen = 1; 318 319 mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); 320 321 if (owner == dlm->node_num) { 322 /* ended up trying to contact ourself. this means 323 * that the lockres had been remote but became local 324 * via a migration. just retry it, now as local */ 325 mlog(0, "%s:%.*s: this node became the master due to a " 326 "migration, re-evaluate now\n", dlm->name, 327 res->lockname.len, res->lockname.name); 328 return DLM_FORWARD; 329 } 330 331 memset(&unlock, 0, sizeof(unlock)); 332 unlock.node_idx = dlm->node_num; 333 unlock.flags = cpu_to_be32(flags); 334 unlock.cookie = lock->ml.cookie; 335 unlock.namelen = res->lockname.len; 336 memcpy(unlock.name, res->lockname.name, unlock.namelen); 337 338 vec[0].iov_len = sizeof(struct dlm_unlock_lock); 339 vec[0].iov_base = &unlock; 340 341 if (flags & LKM_PUT_LVB) { 342 /* extra data to send if we are updating lvb */ 343 vec[1].iov_len = DLM_LVB_LEN; 344 vec[1].iov_base = lock->lksb->lvb; 345 veclen++; 346 } 347 348 tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key, 349 vec, veclen, owner, &status); 350 if (tmpret >= 0) { 351 // successfully sent and received 352 if (status == DLM_CANCELGRANT) 353 ret = DLM_NORMAL; 354 else if (status == DLM_FORWARD) { 355 mlog(0, "master was in-progress. retry\n"); 356 ret = DLM_FORWARD; 357 } else 358 ret = status; 359 lksb->status = status; 360 } else { 361 mlog_errno(tmpret); 362 if (dlm_is_host_down(tmpret)) { 363 /* NOTE: this seems strange, but it is what we want. 364 * when the master goes down during a cancel or 365 * unlock, the recovery code completes the operation 366 * as if the master had not died, then passes the 367 * updated state to the recovery master. this thread 368 * just needs to finish out the operation and call 369 * the unlockast. */ 370 ret = DLM_NORMAL; 371 } else { 372 /* something bad. this will BUG in ocfs2 */ 373 ret = dlm_err_to_dlm_status(tmpret); 374 } 375 lksb->status = ret; 376 } 377 378 return ret; 379 } 380 381 /* 382 * locking: 383 * caller needs: none 384 * taken: takes and drops res->spinlock 385 * held on exit: none 386 * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID, 387 * return value from dlmunlock_master 388 */ 389 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data) 390 { 391 struct dlm_ctxt *dlm = data; 392 struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf; 393 struct dlm_lock_resource *res = NULL; 394 struct list_head *iter; 395 struct dlm_lock *lock = NULL; 396 enum dlm_status status = DLM_NORMAL; 397 int found = 0, i; 398 struct dlm_lockstatus *lksb = NULL; 399 int ignore; 400 u32 flags; 401 struct list_head *queue; 402 403 flags = be32_to_cpu(unlock->flags); 404 405 if (flags & LKM_GET_LVB) { 406 mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n"); 407 return DLM_BADARGS; 408 } 409 410 if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) { 411 mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL " 412 "request!\n"); 413 return DLM_BADARGS; 414 } 415 416 if (unlock->namelen > DLM_LOCKID_NAME_MAX) { 417 mlog(ML_ERROR, "Invalid name length in unlock handler!\n"); 418 return DLM_IVBUFLEN; 419 } 420 421 if (!dlm_grab(dlm)) 422 return DLM_REJECTED; 423 424 mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), 425 "Domain %s not fully joined!\n", dlm->name); 426 427 mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none"); 428 429 res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen); 430 if (!res) { 431 /* We assume here that a no lock resource simply means 432 * it was migrated away and destroyed before the other 433 * node could detect it. */ 434 mlog(0, "returning DLM_FORWARD -- res no longer exists\n"); 435 status = DLM_FORWARD; 436 goto not_found; 437 } 438 439 queue=&res->granted; 440 found = 0; 441 spin_lock(&res->spinlock); 442 if (res->state & DLM_LOCK_RES_RECOVERING) { 443 spin_unlock(&res->spinlock); 444 mlog(0, "returning DLM_RECOVERING\n"); 445 status = DLM_RECOVERING; 446 goto leave; 447 } 448 449 if (res->state & DLM_LOCK_RES_MIGRATING) { 450 spin_unlock(&res->spinlock); 451 mlog(0, "returning DLM_MIGRATING\n"); 452 status = DLM_MIGRATING; 453 goto leave; 454 } 455 456 if (res->owner != dlm->node_num) { 457 spin_unlock(&res->spinlock); 458 mlog(0, "returning DLM_FORWARD -- not master\n"); 459 status = DLM_FORWARD; 460 goto leave; 461 } 462 463 for (i=0; i<3; i++) { 464 list_for_each(iter, queue) { 465 lock = list_entry(iter, struct dlm_lock, list); 466 if (lock->ml.cookie == unlock->cookie && 467 lock->ml.node == unlock->node_idx) { 468 dlm_lock_get(lock); 469 found = 1; 470 break; 471 } 472 } 473 if (found) 474 break; 475 /* scan granted -> converting -> blocked queues */ 476 queue++; 477 } 478 spin_unlock(&res->spinlock); 479 if (!found) { 480 status = DLM_IVLOCKID; 481 goto not_found; 482 } 483 484 /* lock was found on queue */ 485 lksb = lock->lksb; 486 /* unlockast only called on originating node */ 487 if (flags & LKM_PUT_LVB) { 488 lksb->flags |= DLM_LKSB_PUT_LVB; 489 memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN); 490 } 491 492 /* if this is in-progress, propagate the DLM_FORWARD 493 * all the way back out */ 494 status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore); 495 if (status == DLM_FORWARD) 496 mlog(0, "lockres is in progress\n"); 497 498 if (flags & LKM_PUT_LVB) 499 lksb->flags &= ~DLM_LKSB_PUT_LVB; 500 501 dlm_lockres_calc_usage(dlm, res); 502 dlm_kick_thread(dlm, res); 503 504 not_found: 505 if (!found) 506 mlog(ML_ERROR, "failed to find lock to unlock! " 507 "cookie=%u:%llu\n", 508 dlm_get_lock_cookie_node(unlock->cookie), 509 dlm_get_lock_cookie_seq(unlock->cookie)); 510 else { 511 /* send the lksb->status back to the other node */ 512 status = lksb->status; 513 dlm_lock_put(lock); 514 } 515 516 leave: 517 if (res) 518 dlm_lockres_put(res); 519 520 dlm_put(dlm); 521 522 return status; 523 } 524 525 526 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 527 struct dlm_lock_resource *res, 528 struct dlm_lock *lock, 529 struct dlm_lockstatus *lksb, 530 int *actions) 531 { 532 enum dlm_status status; 533 534 if (dlm_lock_on_list(&res->blocked, lock)) { 535 /* cancel this outright */ 536 lksb->status = DLM_NORMAL; 537 status = DLM_NORMAL; 538 *actions = (DLM_UNLOCK_CALL_AST | 539 DLM_UNLOCK_REMOVE_LOCK); 540 } else if (dlm_lock_on_list(&res->converting, lock)) { 541 /* cancel the request, put back on granted */ 542 lksb->status = DLM_NORMAL; 543 status = DLM_NORMAL; 544 *actions = (DLM_UNLOCK_CALL_AST | 545 DLM_UNLOCK_REMOVE_LOCK | 546 DLM_UNLOCK_REGRANT_LOCK | 547 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 548 } else if (dlm_lock_on_list(&res->granted, lock)) { 549 /* too late, already granted. DLM_CANCELGRANT */ 550 lksb->status = DLM_CANCELGRANT; 551 status = DLM_NORMAL; 552 *actions = DLM_UNLOCK_CALL_AST; 553 } else { 554 mlog(ML_ERROR, "lock to cancel is not on any list!\n"); 555 lksb->status = DLM_IVLOCKID; 556 status = DLM_IVLOCKID; 557 *actions = 0; 558 } 559 return status; 560 } 561 562 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 563 struct dlm_lock_resource *res, 564 struct dlm_lock *lock, 565 struct dlm_lockstatus *lksb, 566 int *actions) 567 { 568 enum dlm_status status; 569 570 /* unlock request */ 571 if (!dlm_lock_on_list(&res->granted, lock)) { 572 lksb->status = DLM_DENIED; 573 status = DLM_DENIED; 574 dlm_error(status); 575 *actions = 0; 576 } else { 577 /* unlock granted lock */ 578 lksb->status = DLM_NORMAL; 579 status = DLM_NORMAL; 580 *actions = (DLM_UNLOCK_FREE_LOCK | 581 DLM_UNLOCK_CALL_AST | 582 DLM_UNLOCK_REMOVE_LOCK); 583 } 584 return status; 585 } 586 587 /* there seems to be no point in doing this async 588 * since (even for the remote case) there is really 589 * no work to queue up... so just do it and fire the 590 * unlockast by hand when done... */ 591 enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb, 592 int flags, dlm_astunlockfunc_t *unlockast, void *data) 593 { 594 enum dlm_status status; 595 struct dlm_lock_resource *res; 596 struct dlm_lock *lock = NULL; 597 int call_ast, is_master; 598 599 mlog_entry_void(); 600 601 if (!lksb) { 602 dlm_error(DLM_BADARGS); 603 return DLM_BADARGS; 604 } 605 606 if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) { 607 dlm_error(DLM_BADPARAM); 608 return DLM_BADPARAM; 609 } 610 611 if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) { 612 mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n"); 613 flags &= ~LKM_VALBLK; 614 } 615 616 if (!lksb->lockid || !lksb->lockid->lockres) { 617 dlm_error(DLM_BADPARAM); 618 return DLM_BADPARAM; 619 } 620 621 lock = lksb->lockid; 622 BUG_ON(!lock); 623 dlm_lock_get(lock); 624 625 res = lock->lockres; 626 BUG_ON(!res); 627 dlm_lockres_get(res); 628 retry: 629 call_ast = 0; 630 /* need to retry up here because owner may have changed */ 631 mlog(0, "lock=%p res=%p\n", lock, res); 632 633 spin_lock(&res->spinlock); 634 is_master = (res->owner == dlm->node_num); 635 spin_unlock(&res->spinlock); 636 637 if (is_master) { 638 status = dlmunlock_master(dlm, res, lock, lksb, flags, 639 &call_ast); 640 mlog(0, "done calling dlmunlock_master: returned %d, " 641 "call_ast is %d\n", status, call_ast); 642 } else { 643 status = dlmunlock_remote(dlm, res, lock, lksb, flags, 644 &call_ast); 645 mlog(0, "done calling dlmunlock_remote: returned %d, " 646 "call_ast is %d\n", status, call_ast); 647 } 648 649 if (status == DLM_RECOVERING || 650 status == DLM_MIGRATING || 651 status == DLM_FORWARD) { 652 /* We want to go away for a tiny bit to allow recovery 653 * / migration to complete on this resource. I don't 654 * know of any wait queue we could sleep on as this 655 * may be happening on another node. Perhaps the 656 * proper solution is to queue up requests on the 657 * other end? */ 658 659 /* do we want to yield(); ?? */ 660 msleep(50); 661 662 mlog(0, "retrying unlock due to pending recovery/" 663 "migration/in-progress\n"); 664 goto retry; 665 } 666 667 if (call_ast) { 668 mlog(0, "calling unlockast(%p, %d)\n", data, lksb->status); 669 if (is_master) { 670 /* it is possible that there is one last bast 671 * pending. make sure it is flushed, then 672 * call the unlockast. 673 * not an issue if this is a mastered remotely, 674 * since this lock has been removed from the 675 * lockres queues and cannot be found. */ 676 dlm_kick_thread(dlm, NULL); 677 wait_event(dlm->ast_wq, 678 dlm_lock_basts_flushed(dlm, lock)); 679 } 680 (*unlockast)(data, lksb->status); 681 } 682 683 if (status == DLM_NORMAL) { 684 mlog(0, "kicking the thread\n"); 685 dlm_kick_thread(dlm, res); 686 } else 687 dlm_error(status); 688 689 dlm_lockres_calc_usage(dlm, res); 690 dlm_lockres_put(res); 691 dlm_lock_put(lock); 692 693 mlog(0, "returning status=%d!\n", status); 694 return status; 695 } 696 EXPORT_SYMBOL_GPL(dlmunlock); 697 698