1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * dlmlock.c 5 * 6 * underlying calls for lock creation 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 44 #include "cluster/heartbeat.h" 45 #include "cluster/nodemanager.h" 46 #include "cluster/tcp.h" 47 48 #include "dlmapi.h" 49 #include "dlmcommon.h" 50 51 #include "dlmconvert.h" 52 53 #define MLOG_MASK_PREFIX ML_DLM 54 #include "cluster/masklog.h" 55 56 static DEFINE_SPINLOCK(dlm_cookie_lock); 57 static u64 dlm_next_cookie = 1; 58 59 static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, 60 struct dlm_lock_resource *res, 61 struct dlm_lock *lock, int flags); 62 static void dlm_init_lock(struct dlm_lock *newlock, int type, 63 u8 node, u64 cookie); 64 static void dlm_lock_release(struct kref *kref); 65 static void dlm_lock_detach_lockres(struct dlm_lock *lock); 66 67 /* Tell us whether we can grant a new lock request. 68 * locking: 69 * caller needs: res->spinlock 70 * taken: none 71 * held on exit: none 72 * returns: 1 if the lock can be granted, 0 otherwise. 73 */ 74 static int dlm_can_grant_new_lock(struct dlm_lock_resource *res, 75 struct dlm_lock *lock) 76 { 77 struct list_head *iter; 78 struct dlm_lock *tmplock; 79 80 list_for_each(iter, &res->granted) { 81 tmplock = list_entry(iter, struct dlm_lock, list); 82 83 if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) 84 return 0; 85 } 86 87 list_for_each(iter, &res->converting) { 88 tmplock = list_entry(iter, struct dlm_lock, list); 89 90 if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) 91 return 0; 92 } 93 94 return 1; 95 } 96 97 /* performs lock creation at the lockres master site 98 * locking: 99 * caller needs: none 100 * taken: takes and drops res->spinlock 101 * held on exit: none 102 * returns: DLM_NORMAL, DLM_NOTQUEUED 103 */ 104 static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm, 105 struct dlm_lock_resource *res, 106 struct dlm_lock *lock, int flags) 107 { 108 int call_ast = 0, kick_thread = 0; 109 enum dlm_status status = DLM_NORMAL; 110 111 mlog_entry("type=%d\n", lock->ml.type); 112 113 spin_lock(&res->spinlock); 114 /* if called from dlm_create_lock_handler, need to 115 * ensure it will not sleep in dlm_wait_on_lockres */ 116 status = __dlm_lockres_state_to_status(res); 117 if (status != DLM_NORMAL && 118 lock->ml.node != dlm->node_num) { 119 /* erf. state changed after lock was dropped. */ 120 spin_unlock(&res->spinlock); 121 dlm_error(status); 122 return status; 123 } 124 __dlm_wait_on_lockres(res); 125 __dlm_lockres_reserve_ast(res); 126 127 if (dlm_can_grant_new_lock(res, lock)) { 128 mlog(0, "I can grant this lock right away\n"); 129 /* got it right away */ 130 lock->lksb->status = DLM_NORMAL; 131 status = DLM_NORMAL; 132 dlm_lock_get(lock); 133 list_add_tail(&lock->list, &res->granted); 134 135 /* for the recovery lock, we can't allow the ast 136 * to be queued since the dlmthread is already 137 * frozen. but the recovery lock is always locked 138 * with LKM_NOQUEUE so we do not need the ast in 139 * this special case */ 140 if (!dlm_is_recovery_lock(res->lockname.name, 141 res->lockname.len)) { 142 kick_thread = 1; 143 call_ast = 1; 144 } else { 145 mlog(0, "%s: returning DLM_NORMAL to " 146 "node %u for reco lock\n", dlm->name, 147 lock->ml.node); 148 } 149 } else { 150 /* for NOQUEUE request, unless we get the 151 * lock right away, return DLM_NOTQUEUED */ 152 if (flags & LKM_NOQUEUE) { 153 status = DLM_NOTQUEUED; 154 if (dlm_is_recovery_lock(res->lockname.name, 155 res->lockname.len)) { 156 mlog(0, "%s: returning NOTQUEUED to " 157 "node %u for reco lock\n", dlm->name, 158 lock->ml.node); 159 } 160 } else { 161 dlm_lock_get(lock); 162 list_add_tail(&lock->list, &res->blocked); 163 kick_thread = 1; 164 } 165 } 166 167 spin_unlock(&res->spinlock); 168 wake_up(&res->wq); 169 170 /* either queue the ast or release it */ 171 if (call_ast) 172 dlm_queue_ast(dlm, lock); 173 else 174 dlm_lockres_release_ast(dlm, res); 175 176 dlm_lockres_calc_usage(dlm, res); 177 if (kick_thread) 178 dlm_kick_thread(dlm, res); 179 180 return status; 181 } 182 183 void dlm_revert_pending_lock(struct dlm_lock_resource *res, 184 struct dlm_lock *lock) 185 { 186 /* remove from local queue if it failed */ 187 list_del_init(&lock->list); 188 lock->lksb->flags &= ~DLM_LKSB_GET_LVB; 189 } 190 191 192 /* 193 * locking: 194 * caller needs: none 195 * taken: takes and drops res->spinlock 196 * held on exit: none 197 * returns: DLM_DENIED, DLM_RECOVERING, or net status 198 */ 199 static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm, 200 struct dlm_lock_resource *res, 201 struct dlm_lock *lock, int flags) 202 { 203 enum dlm_status status = DLM_DENIED; 204 int lockres_changed = 1; 205 206 mlog_entry("type=%d\n", lock->ml.type); 207 mlog(0, "lockres %.*s, flags = 0x%x\n", res->lockname.len, 208 res->lockname.name, flags); 209 210 spin_lock(&res->spinlock); 211 212 /* will exit this call with spinlock held */ 213 __dlm_wait_on_lockres(res); 214 res->state |= DLM_LOCK_RES_IN_PROGRESS; 215 216 /* add lock to local (secondary) queue */ 217 dlm_lock_get(lock); 218 list_add_tail(&lock->list, &res->blocked); 219 lock->lock_pending = 1; 220 spin_unlock(&res->spinlock); 221 222 /* spec seems to say that you will get DLM_NORMAL when the lock 223 * has been queued, meaning we need to wait for a reply here. */ 224 status = dlm_send_remote_lock_request(dlm, res, lock, flags); 225 226 spin_lock(&res->spinlock); 227 res->state &= ~DLM_LOCK_RES_IN_PROGRESS; 228 lock->lock_pending = 0; 229 if (status != DLM_NORMAL) { 230 if (status == DLM_RECOVERING && 231 dlm_is_recovery_lock(res->lockname.name, 232 res->lockname.len)) { 233 /* recovery lock was mastered by dead node. 234 * we need to have calc_usage shoot down this 235 * lockres and completely remaster it. */ 236 mlog(0, "%s: recovery lock was owned by " 237 "dead node %u, remaster it now.\n", 238 dlm->name, res->owner); 239 } else if (status != DLM_NOTQUEUED) { 240 /* 241 * DO NOT call calc_usage, as this would unhash 242 * the remote lockres before we ever get to use 243 * it. treat as if we never made any change to 244 * the lockres. 245 */ 246 lockres_changed = 0; 247 dlm_error(status); 248 } 249 dlm_revert_pending_lock(res, lock); 250 dlm_lock_put(lock); 251 } else if (dlm_is_recovery_lock(res->lockname.name, 252 res->lockname.len)) { 253 /* special case for the $RECOVERY lock. 254 * there will never be an AST delivered to put 255 * this lock on the proper secondary queue 256 * (granted), so do it manually. */ 257 mlog(0, "%s: $RECOVERY lock for this node (%u) is " 258 "mastered by %u; got lock, manually granting (no ast)\n", 259 dlm->name, dlm->node_num, res->owner); 260 list_move_tail(&lock->list, &res->granted); 261 } 262 spin_unlock(&res->spinlock); 263 264 if (lockres_changed) 265 dlm_lockres_calc_usage(dlm, res); 266 267 wake_up(&res->wq); 268 return status; 269 } 270 271 272 /* for remote lock creation. 273 * locking: 274 * caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS 275 * taken: none 276 * held on exit: none 277 * returns: DLM_NOLOCKMGR, or net status 278 */ 279 static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, 280 struct dlm_lock_resource *res, 281 struct dlm_lock *lock, int flags) 282 { 283 struct dlm_create_lock create; 284 int tmpret, status = 0; 285 enum dlm_status ret; 286 287 mlog_entry_void(); 288 289 memset(&create, 0, sizeof(create)); 290 create.node_idx = dlm->node_num; 291 create.requested_type = lock->ml.type; 292 create.cookie = lock->ml.cookie; 293 create.namelen = res->lockname.len; 294 create.flags = cpu_to_be32(flags); 295 memcpy(create.name, res->lockname.name, create.namelen); 296 297 tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create, 298 sizeof(create), res->owner, &status); 299 if (tmpret >= 0) { 300 // successfully sent and received 301 ret = status; // this is already a dlm_status 302 if (ret == DLM_REJECTED) { 303 mlog(ML_ERROR, "%s:%.*s: BUG. this is a stale lockres " 304 "no longer owned by %u. that node is coming back " 305 "up currently.\n", dlm->name, create.namelen, 306 create.name, res->owner); 307 dlm_print_one_lock_resource(res); 308 BUG(); 309 } 310 } else { 311 mlog_errno(tmpret); 312 if (dlm_is_host_down(tmpret)) { 313 ret = DLM_RECOVERING; 314 mlog(0, "node %u died so returning DLM_RECOVERING " 315 "from lock message!\n", res->owner); 316 } else { 317 ret = dlm_err_to_dlm_status(tmpret); 318 } 319 } 320 321 return ret; 322 } 323 324 void dlm_lock_get(struct dlm_lock *lock) 325 { 326 kref_get(&lock->lock_refs); 327 } 328 329 void dlm_lock_put(struct dlm_lock *lock) 330 { 331 kref_put(&lock->lock_refs, dlm_lock_release); 332 } 333 334 static void dlm_lock_release(struct kref *kref) 335 { 336 struct dlm_lock *lock; 337 338 lock = container_of(kref, struct dlm_lock, lock_refs); 339 340 BUG_ON(!list_empty(&lock->list)); 341 BUG_ON(!list_empty(&lock->ast_list)); 342 BUG_ON(!list_empty(&lock->bast_list)); 343 BUG_ON(lock->ast_pending); 344 BUG_ON(lock->bast_pending); 345 346 dlm_lock_detach_lockres(lock); 347 348 if (lock->lksb_kernel_allocated) { 349 mlog(0, "freeing kernel-allocated lksb\n"); 350 kfree(lock->lksb); 351 } 352 kfree(lock); 353 } 354 355 /* associate a lock with it's lockres, getting a ref on the lockres */ 356 void dlm_lock_attach_lockres(struct dlm_lock *lock, 357 struct dlm_lock_resource *res) 358 { 359 dlm_lockres_get(res); 360 lock->lockres = res; 361 } 362 363 /* drop ref on lockres, if there is still one associated with lock */ 364 static void dlm_lock_detach_lockres(struct dlm_lock *lock) 365 { 366 struct dlm_lock_resource *res; 367 368 res = lock->lockres; 369 if (res) { 370 lock->lockres = NULL; 371 mlog(0, "removing lock's lockres reference\n"); 372 dlm_lockres_put(res); 373 } 374 } 375 376 static void dlm_init_lock(struct dlm_lock *newlock, int type, 377 u8 node, u64 cookie) 378 { 379 INIT_LIST_HEAD(&newlock->list); 380 INIT_LIST_HEAD(&newlock->ast_list); 381 INIT_LIST_HEAD(&newlock->bast_list); 382 spin_lock_init(&newlock->spinlock); 383 newlock->ml.type = type; 384 newlock->ml.convert_type = LKM_IVMODE; 385 newlock->ml.highest_blocked = LKM_IVMODE; 386 newlock->ml.node = node; 387 newlock->ml.pad1 = 0; 388 newlock->ml.list = 0; 389 newlock->ml.flags = 0; 390 newlock->ast = NULL; 391 newlock->bast = NULL; 392 newlock->astdata = NULL; 393 newlock->ml.cookie = cpu_to_be64(cookie); 394 newlock->ast_pending = 0; 395 newlock->bast_pending = 0; 396 newlock->convert_pending = 0; 397 newlock->lock_pending = 0; 398 newlock->unlock_pending = 0; 399 newlock->cancel_pending = 0; 400 newlock->lksb_kernel_allocated = 0; 401 402 kref_init(&newlock->lock_refs); 403 } 404 405 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, 406 struct dlm_lockstatus *lksb) 407 { 408 struct dlm_lock *lock; 409 int kernel_allocated = 0; 410 411 lock = kcalloc(1, sizeof(*lock), GFP_NOFS); 412 if (!lock) 413 return NULL; 414 415 if (!lksb) { 416 /* zero memory only if kernel-allocated */ 417 lksb = kcalloc(1, sizeof(*lksb), GFP_NOFS); 418 if (!lksb) { 419 kfree(lock); 420 return NULL; 421 } 422 kernel_allocated = 1; 423 } 424 425 dlm_init_lock(lock, type, node, cookie); 426 if (kernel_allocated) 427 lock->lksb_kernel_allocated = 1; 428 lock->lksb = lksb; 429 lksb->lockid = lock; 430 return lock; 431 } 432 433 /* handler for lock creation net message 434 * locking: 435 * caller needs: none 436 * taken: takes and drops res->spinlock 437 * held on exit: none 438 * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED 439 */ 440 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data) 441 { 442 struct dlm_ctxt *dlm = data; 443 struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf; 444 struct dlm_lock_resource *res = NULL; 445 struct dlm_lock *newlock = NULL; 446 struct dlm_lockstatus *lksb = NULL; 447 enum dlm_status status = DLM_NORMAL; 448 char *name; 449 unsigned int namelen; 450 451 BUG_ON(!dlm); 452 453 mlog_entry_void(); 454 455 if (!dlm_grab(dlm)) 456 return DLM_REJECTED; 457 458 name = create->name; 459 namelen = create->namelen; 460 status = DLM_REJECTED; 461 if (!dlm_domain_fully_joined(dlm)) { 462 mlog(ML_ERROR, "Domain %s not fully joined, but node %u is " 463 "sending a create_lock message for lock %.*s!\n", 464 dlm->name, create->node_idx, namelen, name); 465 dlm_error(status); 466 goto leave; 467 } 468 469 status = DLM_IVBUFLEN; 470 if (namelen > DLM_LOCKID_NAME_MAX) { 471 dlm_error(status); 472 goto leave; 473 } 474 475 status = DLM_SYSERR; 476 newlock = dlm_new_lock(create->requested_type, 477 create->node_idx, 478 be64_to_cpu(create->cookie), NULL); 479 if (!newlock) { 480 dlm_error(status); 481 goto leave; 482 } 483 484 lksb = newlock->lksb; 485 486 if (be32_to_cpu(create->flags) & LKM_GET_LVB) { 487 lksb->flags |= DLM_LKSB_GET_LVB; 488 mlog(0, "set DLM_LKSB_GET_LVB flag\n"); 489 } 490 491 status = DLM_IVLOCKID; 492 res = dlm_lookup_lockres(dlm, name, namelen); 493 if (!res) { 494 dlm_error(status); 495 goto leave; 496 } 497 498 spin_lock(&res->spinlock); 499 status = __dlm_lockres_state_to_status(res); 500 spin_unlock(&res->spinlock); 501 502 if (status != DLM_NORMAL) { 503 mlog(0, "lockres recovering/migrating/in-progress\n"); 504 goto leave; 505 } 506 507 dlm_lock_attach_lockres(newlock, res); 508 509 status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags)); 510 leave: 511 if (status != DLM_NORMAL) 512 if (newlock) 513 dlm_lock_put(newlock); 514 515 if (res) 516 dlm_lockres_put(res); 517 518 dlm_put(dlm); 519 520 return status; 521 } 522 523 524 /* fetch next node-local (u8 nodenum + u56 cookie) into u64 */ 525 static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie) 526 { 527 u64 tmpnode = node_num; 528 529 /* shift single byte of node num into top 8 bits */ 530 tmpnode <<= 56; 531 532 spin_lock(&dlm_cookie_lock); 533 *cookie = (dlm_next_cookie | tmpnode); 534 if (++dlm_next_cookie & 0xff00000000000000ull) { 535 mlog(0, "This node's cookie will now wrap!\n"); 536 dlm_next_cookie = 1; 537 } 538 spin_unlock(&dlm_cookie_lock); 539 } 540 541 enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode, 542 struct dlm_lockstatus *lksb, int flags, 543 const char *name, dlm_astlockfunc_t *ast, void *data, 544 dlm_bastlockfunc_t *bast) 545 { 546 enum dlm_status status; 547 struct dlm_lock_resource *res = NULL; 548 struct dlm_lock *lock = NULL; 549 int convert = 0, recovery = 0; 550 551 /* yes this function is a mess. 552 * TODO: clean this up. lots of common code in the 553 * lock and convert paths, especially in the retry blocks */ 554 if (!lksb) { 555 dlm_error(DLM_BADARGS); 556 return DLM_BADARGS; 557 } 558 559 status = DLM_BADPARAM; 560 if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) { 561 dlm_error(status); 562 goto error; 563 } 564 565 if (flags & ~LKM_VALID_FLAGS) { 566 dlm_error(status); 567 goto error; 568 } 569 570 convert = (flags & LKM_CONVERT); 571 recovery = (flags & LKM_RECOVERY); 572 573 if (recovery && 574 (!dlm_is_recovery_lock(name, strlen(name)) || convert) ) { 575 dlm_error(status); 576 goto error; 577 } 578 if (convert && (flags & LKM_LOCAL)) { 579 mlog(ML_ERROR, "strange LOCAL convert request!\n"); 580 goto error; 581 } 582 583 if (convert) { 584 /* CONVERT request */ 585 586 /* if converting, must pass in a valid dlm_lock */ 587 lock = lksb->lockid; 588 if (!lock) { 589 mlog(ML_ERROR, "NULL lock pointer in convert " 590 "request\n"); 591 goto error; 592 } 593 594 res = lock->lockres; 595 if (!res) { 596 mlog(ML_ERROR, "NULL lockres pointer in convert " 597 "request\n"); 598 goto error; 599 } 600 dlm_lockres_get(res); 601 602 /* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are 603 * static after the original lock call. convert requests will 604 * ensure that everything is the same, or return DLM_BADARGS. 605 * this means that DLM_DENIED_NOASTS will never be returned. 606 */ 607 if (lock->lksb != lksb || lock->ast != ast || 608 lock->bast != bast || lock->astdata != data) { 609 status = DLM_BADARGS; 610 mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, " 611 "astdata=%p\n", lksb, ast, bast, data); 612 mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, " 613 "astdata=%p\n", lock->lksb, lock->ast, 614 lock->bast, lock->astdata); 615 goto error; 616 } 617 retry_convert: 618 dlm_wait_for_recovery(dlm); 619 620 if (res->owner == dlm->node_num) 621 status = dlmconvert_master(dlm, res, lock, flags, mode); 622 else 623 status = dlmconvert_remote(dlm, res, lock, flags, mode); 624 if (status == DLM_RECOVERING || status == DLM_MIGRATING || 625 status == DLM_FORWARD) { 626 /* for now, see how this works without sleeping 627 * and just retry right away. I suspect the reco 628 * or migration will complete fast enough that 629 * no waiting will be necessary */ 630 mlog(0, "retrying convert with migration/recovery/" 631 "in-progress\n"); 632 msleep(100); 633 goto retry_convert; 634 } 635 } else { 636 u64 tmpcookie; 637 638 /* LOCK request */ 639 status = DLM_BADARGS; 640 if (!name) { 641 dlm_error(status); 642 goto error; 643 } 644 645 status = DLM_IVBUFLEN; 646 if (strlen(name) > DLM_LOCKID_NAME_MAX || strlen(name) < 1) { 647 dlm_error(status); 648 goto error; 649 } 650 651 dlm_get_next_cookie(dlm->node_num, &tmpcookie); 652 lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb); 653 if (!lock) { 654 dlm_error(status); 655 goto error; 656 } 657 658 if (!recovery) 659 dlm_wait_for_recovery(dlm); 660 661 /* find or create the lock resource */ 662 res = dlm_get_lock_resource(dlm, name, flags); 663 if (!res) { 664 status = DLM_IVLOCKID; 665 dlm_error(status); 666 goto error; 667 } 668 669 mlog(0, "type=%d, flags = 0x%x\n", mode, flags); 670 mlog(0, "creating lock: lock=%p res=%p\n", lock, res); 671 672 dlm_lock_attach_lockres(lock, res); 673 lock->ast = ast; 674 lock->bast = bast; 675 lock->astdata = data; 676 677 retry_lock: 678 if (flags & LKM_VALBLK) { 679 mlog(0, "LKM_VALBLK passed by caller\n"); 680 681 /* LVB requests for non PR, PW or EX locks are 682 * ignored. */ 683 if (mode < LKM_PRMODE) 684 flags &= ~LKM_VALBLK; 685 else { 686 flags |= LKM_GET_LVB; 687 lock->lksb->flags |= DLM_LKSB_GET_LVB; 688 } 689 } 690 691 if (res->owner == dlm->node_num) 692 status = dlmlock_master(dlm, res, lock, flags); 693 else 694 status = dlmlock_remote(dlm, res, lock, flags); 695 696 if (status == DLM_RECOVERING || status == DLM_MIGRATING || 697 status == DLM_FORWARD) { 698 mlog(0, "retrying lock with migration/" 699 "recovery/in progress\n"); 700 msleep(100); 701 /* no waiting for dlm_reco_thread */ 702 if (recovery) { 703 if (status != DLM_RECOVERING) 704 goto retry_lock; 705 706 mlog(0, "%s: got RECOVERING " 707 "for $RECOVERY lock, master " 708 "was %u\n", dlm->name, 709 res->owner); 710 /* wait to see the node go down, then 711 * drop down and allow the lockres to 712 * get cleaned up. need to remaster. */ 713 dlm_wait_for_node_death(dlm, res->owner, 714 DLM_NODE_DEATH_WAIT_MAX); 715 } else { 716 dlm_wait_for_recovery(dlm); 717 goto retry_lock; 718 } 719 } 720 721 if (status != DLM_NORMAL) { 722 lock->lksb->flags &= ~DLM_LKSB_GET_LVB; 723 if (status != DLM_NOTQUEUED) 724 dlm_error(status); 725 goto error; 726 } 727 } 728 729 error: 730 if (status != DLM_NORMAL) { 731 if (lock && !convert) 732 dlm_lock_put(lock); 733 // this is kind of unnecessary 734 lksb->status = status; 735 } 736 737 /* put lockres ref from the convert path 738 * or from dlm_get_lock_resource */ 739 if (res) 740 dlm_lockres_put(res); 741 742 return status; 743 } 744 EXPORT_SYMBOL_GPL(dlmlock); 745