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/highmem.h> 32 #include <linux/init.h> 33 #include <linux/sysctl.h> 34 #include <linux/random.h> 35 #include <linux/blkdev.h> 36 #include <linux/socket.h> 37 #include <linux/inet.h> 38 #include <linux/spinlock.h> 39 #include <linux/delay.h> 40 41 #include "cluster/heartbeat.h" 42 #include "cluster/nodemanager.h" 43 #include "cluster/tcp.h" 44 45 #include "dlmapi.h" 46 #include "dlmcommon.h" 47 48 #define MLOG_MASK_PREFIX ML_DLM 49 #include "cluster/masklog.h" 50 51 #define DLM_UNLOCK_FREE_LOCK 0x00000001 52 #define DLM_UNLOCK_CALL_AST 0x00000002 53 #define DLM_UNLOCK_REMOVE_LOCK 0x00000004 54 #define DLM_UNLOCK_REGRANT_LOCK 0x00000008 55 #define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010 56 57 58 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 59 struct dlm_lock_resource *res, 60 struct dlm_lock *lock, 61 struct dlm_lockstatus *lksb, 62 int *actions); 63 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 64 struct dlm_lock_resource *res, 65 struct dlm_lock *lock, 66 struct dlm_lockstatus *lksb, 67 int *actions); 68 69 static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, 70 struct dlm_lock_resource *res, 71 struct dlm_lock *lock, 72 struct dlm_lockstatus *lksb, 73 int flags, 74 u8 owner); 75 76 77 /* 78 * according to the spec: 79 * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf 80 * 81 * flags & LKM_CANCEL != 0: must be converting or blocked 82 * flags & LKM_CANCEL == 0: must be granted 83 * 84 * So to unlock a converting lock, you must first cancel the 85 * convert (passing LKM_CANCEL in flags), then call the unlock 86 * again (with no LKM_CANCEL in flags). 87 */ 88 89 90 /* 91 * locking: 92 * caller needs: none 93 * taken: res->spinlock and lock->spinlock taken and dropped 94 * held on exit: none 95 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network 96 * all callers should have taken an extra ref on lock coming in 97 */ 98 static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm, 99 struct dlm_lock_resource *res, 100 struct dlm_lock *lock, 101 struct dlm_lockstatus *lksb, 102 int flags, int *call_ast, 103 int master_node) 104 { 105 enum dlm_status status; 106 int actions = 0; 107 int in_use; 108 u8 owner; 109 110 mlog(0, "master_node = %d, valblk = %d\n", master_node, 111 flags & LKM_VALBLK); 112 113 if (master_node) 114 BUG_ON(res->owner != dlm->node_num); 115 else 116 BUG_ON(res->owner == dlm->node_num); 117 118 spin_lock(&dlm->ast_lock); 119 /* We want to be sure that we're not freeing a lock 120 * that still has AST's pending... */ 121 in_use = !list_empty(&lock->ast_list); 122 spin_unlock(&dlm->ast_lock); 123 if (in_use && !(flags & LKM_CANCEL)) { 124 mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock " 125 "while waiting for an ast!", res->lockname.len, 126 res->lockname.name); 127 return DLM_BADPARAM; 128 } 129 130 spin_lock(&res->spinlock); 131 if (res->state & DLM_LOCK_RES_IN_PROGRESS) { 132 if (master_node && !(flags & LKM_CANCEL)) { 133 mlog(ML_ERROR, "lockres in progress!\n"); 134 spin_unlock(&res->spinlock); 135 return DLM_FORWARD; 136 } 137 /* ok for this to sleep if not in a network handler */ 138 __dlm_wait_on_lockres(res); 139 res->state |= DLM_LOCK_RES_IN_PROGRESS; 140 } 141 spin_lock(&lock->spinlock); 142 143 if (res->state & DLM_LOCK_RES_RECOVERING) { 144 status = DLM_RECOVERING; 145 goto leave; 146 } 147 148 if (res->state & DLM_LOCK_RES_MIGRATING) { 149 status = DLM_MIGRATING; 150 goto leave; 151 } 152 153 /* see above for what the spec says about 154 * LKM_CANCEL and the lock queue state */ 155 if (flags & LKM_CANCEL) 156 status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions); 157 else 158 status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions); 159 160 if (status != DLM_NORMAL && (status != DLM_CANCELGRANT || !master_node)) 161 goto leave; 162 163 /* By now this has been masked out of cancel requests. */ 164 if (flags & LKM_VALBLK) { 165 /* make the final update to the lvb */ 166 if (master_node) 167 memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN); 168 else 169 flags |= LKM_PUT_LVB; /* let the send function 170 * handle it. */ 171 } 172 173 if (!master_node) { 174 owner = res->owner; 175 /* drop locks and send message */ 176 if (flags & LKM_CANCEL) 177 lock->cancel_pending = 1; 178 else 179 lock->unlock_pending = 1; 180 spin_unlock(&lock->spinlock); 181 spin_unlock(&res->spinlock); 182 status = dlm_send_remote_unlock_request(dlm, res, lock, lksb, 183 flags, owner); 184 spin_lock(&res->spinlock); 185 spin_lock(&lock->spinlock); 186 /* if the master told us the lock was already granted, 187 * let the ast handle all of these actions */ 188 if (status == DLM_CANCELGRANT) { 189 actions &= ~(DLM_UNLOCK_REMOVE_LOCK| 190 DLM_UNLOCK_REGRANT_LOCK| 191 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 192 } else if (status == DLM_RECOVERING || 193 status == DLM_MIGRATING || 194 status == DLM_FORWARD) { 195 /* must clear the actions because this unlock 196 * is about to be retried. cannot free or do 197 * any list manipulation. */ 198 mlog(0, "%s:%.*s: clearing actions, %s\n", 199 dlm->name, res->lockname.len, 200 res->lockname.name, 201 status==DLM_RECOVERING?"recovering": 202 (status==DLM_MIGRATING?"migrating": 203 "forward")); 204 actions = 0; 205 } 206 if (flags & LKM_CANCEL) 207 lock->cancel_pending = 0; 208 else 209 lock->unlock_pending = 0; 210 211 } 212 213 /* get an extra ref on lock. if we are just switching 214 * lists here, we dont want the lock to go away. */ 215 dlm_lock_get(lock); 216 217 if (actions & DLM_UNLOCK_REMOVE_LOCK) { 218 list_del_init(&lock->list); 219 dlm_lock_put(lock); 220 } 221 if (actions & DLM_UNLOCK_REGRANT_LOCK) { 222 dlm_lock_get(lock); 223 list_add_tail(&lock->list, &res->granted); 224 } 225 if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) { 226 mlog(0, "clearing convert_type at %smaster node\n", 227 master_node ? "" : "non-"); 228 lock->ml.convert_type = LKM_IVMODE; 229 } 230 231 /* remove the extra ref on lock */ 232 dlm_lock_put(lock); 233 234 leave: 235 res->state &= ~DLM_LOCK_RES_IN_PROGRESS; 236 if (!dlm_lock_on_list(&res->converting, lock)) 237 BUG_ON(lock->ml.convert_type != LKM_IVMODE); 238 else 239 BUG_ON(lock->ml.convert_type == LKM_IVMODE); 240 spin_unlock(&lock->spinlock); 241 spin_unlock(&res->spinlock); 242 wake_up(&res->wq); 243 244 /* let the caller's final dlm_lock_put handle the actual kfree */ 245 if (actions & DLM_UNLOCK_FREE_LOCK) { 246 /* this should always be coupled with list removal */ 247 BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK)); 248 mlog(0, "lock %u:%llu should be gone now! refs=%d\n", 249 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), 250 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), 251 atomic_read(&lock->lock_refs.refcount)-1); 252 dlm_lock_put(lock); 253 } 254 if (actions & DLM_UNLOCK_CALL_AST) 255 *call_ast = 1; 256 257 /* if cancel or unlock succeeded, lvb work is done */ 258 if (status == DLM_NORMAL) 259 lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB); 260 261 return status; 262 } 263 264 void dlm_commit_pending_unlock(struct dlm_lock_resource *res, 265 struct dlm_lock *lock) 266 { 267 /* leave DLM_LKSB_PUT_LVB on the lksb so any final 268 * update of the lvb will be sent to the new master */ 269 list_del_init(&lock->list); 270 } 271 272 void dlm_commit_pending_cancel(struct dlm_lock_resource *res, 273 struct dlm_lock *lock) 274 { 275 list_move_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 if (owner == dlm->node_num) { 323 /* ended up trying to contact ourself. this means 324 * that the lockres had been remote but became local 325 * via a migration. just retry it, now as local */ 326 mlog(0, "%s:%.*s: this node became the master due to a " 327 "migration, re-evaluate now\n", dlm->name, 328 res->lockname.len, res->lockname.name); 329 return DLM_FORWARD; 330 } 331 332 memset(&unlock, 0, sizeof(unlock)); 333 unlock.node_idx = dlm->node_num; 334 unlock.flags = cpu_to_be32(flags); 335 unlock.cookie = lock->ml.cookie; 336 unlock.namelen = res->lockname.len; 337 memcpy(unlock.name, res->lockname.name, unlock.namelen); 338 339 vec[0].iov_len = sizeof(struct dlm_unlock_lock); 340 vec[0].iov_base = &unlock; 341 342 if (flags & LKM_PUT_LVB) { 343 /* extra data to send if we are updating lvb */ 344 vec[1].iov_len = DLM_LVB_LEN; 345 vec[1].iov_base = lock->lksb->lvb; 346 veclen++; 347 } 348 349 tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key, 350 vec, veclen, owner, &status); 351 if (tmpret >= 0) { 352 // successfully sent and received 353 if (status == DLM_FORWARD) 354 mlog(0, "master was in-progress. retry\n"); 355 ret = status; 356 } else { 357 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " 358 "node %u\n", tmpret, DLM_UNLOCK_LOCK_MSG, dlm->key, owner); 359 if (dlm_is_host_down(tmpret)) { 360 /* NOTE: this seems strange, but it is what we want. 361 * when the master goes down during a cancel or 362 * unlock, the recovery code completes the operation 363 * as if the master had not died, then passes the 364 * updated state to the recovery master. this thread 365 * just needs to finish out the operation and call 366 * the unlockast. */ 367 ret = DLM_NORMAL; 368 } else { 369 /* something bad. this will BUG in ocfs2 */ 370 ret = dlm_err_to_dlm_status(tmpret); 371 } 372 } 373 374 return ret; 375 } 376 377 /* 378 * locking: 379 * caller needs: none 380 * taken: takes and drops res->spinlock 381 * held on exit: none 382 * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID, 383 * return value from dlmunlock_master 384 */ 385 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data, 386 void **ret_data) 387 { 388 struct dlm_ctxt *dlm = data; 389 struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf; 390 struct dlm_lock_resource *res = NULL; 391 struct list_head *iter; 392 struct dlm_lock *lock = NULL; 393 enum dlm_status status = DLM_NORMAL; 394 int found = 0, i; 395 struct dlm_lockstatus *lksb = NULL; 396 int ignore; 397 u32 flags; 398 struct list_head *queue; 399 400 flags = be32_to_cpu(unlock->flags); 401 402 if (flags & LKM_GET_LVB) { 403 mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n"); 404 return DLM_BADARGS; 405 } 406 407 if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) { 408 mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL " 409 "request!\n"); 410 return DLM_BADARGS; 411 } 412 413 if (unlock->namelen > DLM_LOCKID_NAME_MAX) { 414 mlog(ML_ERROR, "Invalid name length in unlock handler!\n"); 415 return DLM_IVBUFLEN; 416 } 417 418 if (!dlm_grab(dlm)) 419 return DLM_REJECTED; 420 421 mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), 422 "Domain %s not fully joined!\n", dlm->name); 423 424 mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none"); 425 426 res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen); 427 if (!res) { 428 /* We assume here that a no lock resource simply means 429 * it was migrated away and destroyed before the other 430 * node could detect it. */ 431 mlog(0, "returning DLM_FORWARD -- res no longer exists\n"); 432 status = DLM_FORWARD; 433 goto not_found; 434 } 435 436 queue=&res->granted; 437 found = 0; 438 spin_lock(&res->spinlock); 439 if (res->state & DLM_LOCK_RES_RECOVERING) { 440 spin_unlock(&res->spinlock); 441 mlog(0, "returning DLM_RECOVERING\n"); 442 status = DLM_RECOVERING; 443 goto leave; 444 } 445 446 if (res->state & DLM_LOCK_RES_MIGRATING) { 447 spin_unlock(&res->spinlock); 448 mlog(0, "returning DLM_MIGRATING\n"); 449 status = DLM_MIGRATING; 450 goto leave; 451 } 452 453 if (res->owner != dlm->node_num) { 454 spin_unlock(&res->spinlock); 455 mlog(0, "returning DLM_FORWARD -- not master\n"); 456 status = DLM_FORWARD; 457 goto leave; 458 } 459 460 for (i=0; i<3; i++) { 461 list_for_each(iter, queue) { 462 lock = list_entry(iter, struct dlm_lock, list); 463 if (lock->ml.cookie == unlock->cookie && 464 lock->ml.node == unlock->node_idx) { 465 dlm_lock_get(lock); 466 found = 1; 467 break; 468 } 469 } 470 if (found) 471 break; 472 /* scan granted -> converting -> blocked queues */ 473 queue++; 474 } 475 spin_unlock(&res->spinlock); 476 if (!found) { 477 status = DLM_IVLOCKID; 478 goto not_found; 479 } 480 481 /* lock was found on queue */ 482 lksb = lock->lksb; 483 if (flags & (LKM_VALBLK|LKM_PUT_LVB) && 484 lock->ml.type != LKM_EXMODE) 485 flags &= ~(LKM_VALBLK|LKM_PUT_LVB); 486 487 /* unlockast only called on originating node */ 488 if (flags & LKM_PUT_LVB) { 489 lksb->flags |= DLM_LKSB_PUT_LVB; 490 memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN); 491 } 492 493 /* if this is in-progress, propagate the DLM_FORWARD 494 * all the way back out */ 495 status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore); 496 if (status == DLM_FORWARD) 497 mlog(0, "lockres is in progress\n"); 498 499 if (flags & LKM_PUT_LVB) 500 lksb->flags &= ~DLM_LKSB_PUT_LVB; 501 502 dlm_lockres_calc_usage(dlm, res); 503 dlm_kick_thread(dlm, res); 504 505 not_found: 506 if (!found) 507 mlog(ML_ERROR, "failed to find lock to unlock! " 508 "cookie=%u:%llu\n", 509 dlm_get_lock_cookie_node(be64_to_cpu(unlock->cookie)), 510 dlm_get_lock_cookie_seq(be64_to_cpu(unlock->cookie))); 511 else 512 dlm_lock_put(lock); 513 514 leave: 515 if (res) 516 dlm_lockres_put(res); 517 518 dlm_put(dlm); 519 520 return status; 521 } 522 523 524 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 525 struct dlm_lock_resource *res, 526 struct dlm_lock *lock, 527 struct dlm_lockstatus *lksb, 528 int *actions) 529 { 530 enum dlm_status status; 531 532 if (dlm_lock_on_list(&res->blocked, lock)) { 533 /* cancel this outright */ 534 status = DLM_NORMAL; 535 *actions = (DLM_UNLOCK_CALL_AST | 536 DLM_UNLOCK_REMOVE_LOCK); 537 } else if (dlm_lock_on_list(&res->converting, lock)) { 538 /* cancel the request, put back on granted */ 539 status = DLM_NORMAL; 540 *actions = (DLM_UNLOCK_CALL_AST | 541 DLM_UNLOCK_REMOVE_LOCK | 542 DLM_UNLOCK_REGRANT_LOCK | 543 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 544 } else if (dlm_lock_on_list(&res->granted, lock)) { 545 /* too late, already granted. */ 546 status = DLM_CANCELGRANT; 547 *actions = DLM_UNLOCK_CALL_AST; 548 } else { 549 mlog(ML_ERROR, "lock to cancel is not on any list!\n"); 550 status = DLM_IVLOCKID; 551 *actions = 0; 552 } 553 return status; 554 } 555 556 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 557 struct dlm_lock_resource *res, 558 struct dlm_lock *lock, 559 struct dlm_lockstatus *lksb, 560 int *actions) 561 { 562 enum dlm_status status; 563 564 /* unlock request */ 565 if (!dlm_lock_on_list(&res->granted, lock)) { 566 status = DLM_DENIED; 567 dlm_error(status); 568 *actions = 0; 569 } else { 570 /* unlock granted lock */ 571 status = DLM_NORMAL; 572 *actions = (DLM_UNLOCK_FREE_LOCK | 573 DLM_UNLOCK_CALL_AST | 574 DLM_UNLOCK_REMOVE_LOCK); 575 } 576 return status; 577 } 578 579 /* there seems to be no point in doing this async 580 * since (even for the remote case) there is really 581 * no work to queue up... so just do it and fire the 582 * unlockast by hand when done... */ 583 enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb, 584 int flags, dlm_astunlockfunc_t *unlockast, void *data) 585 { 586 enum dlm_status status; 587 struct dlm_lock_resource *res; 588 struct dlm_lock *lock = NULL; 589 int call_ast, is_master; 590 591 mlog_entry_void(); 592 593 if (!lksb) { 594 dlm_error(DLM_BADARGS); 595 return DLM_BADARGS; 596 } 597 598 if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) { 599 dlm_error(DLM_BADPARAM); 600 return DLM_BADPARAM; 601 } 602 603 if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) { 604 mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n"); 605 flags &= ~LKM_VALBLK; 606 } 607 608 if (!lksb->lockid || !lksb->lockid->lockres) { 609 dlm_error(DLM_BADPARAM); 610 return DLM_BADPARAM; 611 } 612 613 lock = lksb->lockid; 614 BUG_ON(!lock); 615 dlm_lock_get(lock); 616 617 res = lock->lockres; 618 BUG_ON(!res); 619 dlm_lockres_get(res); 620 retry: 621 call_ast = 0; 622 /* need to retry up here because owner may have changed */ 623 mlog(0, "lock=%p res=%p\n", lock, res); 624 625 spin_lock(&res->spinlock); 626 is_master = (res->owner == dlm->node_num); 627 if (flags & LKM_VALBLK && lock->ml.type != LKM_EXMODE) 628 flags &= ~LKM_VALBLK; 629 spin_unlock(&res->spinlock); 630 631 if (is_master) { 632 status = dlmunlock_master(dlm, res, lock, lksb, flags, 633 &call_ast); 634 mlog(0, "done calling dlmunlock_master: returned %d, " 635 "call_ast is %d\n", status, call_ast); 636 } else { 637 status = dlmunlock_remote(dlm, res, lock, lksb, flags, 638 &call_ast); 639 mlog(0, "done calling dlmunlock_remote: returned %d, " 640 "call_ast is %d\n", status, call_ast); 641 } 642 643 if (status == DLM_RECOVERING || 644 status == DLM_MIGRATING || 645 status == DLM_FORWARD) { 646 /* We want to go away for a tiny bit to allow recovery 647 * / migration to complete on this resource. I don't 648 * know of any wait queue we could sleep on as this 649 * may be happening on another node. Perhaps the 650 * proper solution is to queue up requests on the 651 * other end? */ 652 653 /* do we want to yield(); ?? */ 654 msleep(50); 655 656 mlog(0, "retrying unlock due to pending recovery/" 657 "migration/in-progress\n"); 658 goto retry; 659 } 660 661 if (call_ast) { 662 mlog(0, "calling unlockast(%p, %d)\n", data, status); 663 if (is_master) { 664 /* it is possible that there is one last bast 665 * pending. make sure it is flushed, then 666 * call the unlockast. 667 * not an issue if this is a mastered remotely, 668 * since this lock has been removed from the 669 * lockres queues and cannot be found. */ 670 dlm_kick_thread(dlm, NULL); 671 wait_event(dlm->ast_wq, 672 dlm_lock_basts_flushed(dlm, lock)); 673 } 674 (*unlockast)(data, status); 675 } 676 677 if (status == DLM_CANCELGRANT) 678 status = DLM_NORMAL; 679 680 if (status == DLM_NORMAL) { 681 mlog(0, "kicking the thread\n"); 682 dlm_kick_thread(dlm, res); 683 } else 684 dlm_error(status); 685 686 dlm_lockres_calc_usage(dlm, res); 687 dlm_lockres_put(res); 688 dlm_lock_put(lock); 689 690 mlog(0, "returning status=%d!\n", status); 691 return status; 692 } 693 EXPORT_SYMBOL_GPL(dlmunlock); 694 695