1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 ******************************************************************************* 4 ** 5 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 6 ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 7 ** 8 ** 9 ******************************************************************************* 10 ******************************************************************************/ 11 12 #include <linux/module.h> 13 14 #include "dlm_internal.h" 15 #include "lockspace.h" 16 #include "member.h" 17 #include "recoverd.h" 18 #include "dir.h" 19 #include "midcomms.h" 20 #include "lowcomms.h" 21 #include "config.h" 22 #include "memory.h" 23 #include "lock.h" 24 #include "recover.h" 25 #include "requestqueue.h" 26 #include "user.h" 27 #include "ast.h" 28 29 static int ls_count; 30 static struct mutex ls_lock; 31 static struct list_head lslist; 32 static spinlock_t lslist_lock; 33 static struct task_struct * scand_task; 34 35 36 static ssize_t dlm_control_store(struct dlm_ls *ls, const char *buf, size_t len) 37 { 38 ssize_t ret = len; 39 int n; 40 int rc = kstrtoint(buf, 0, &n); 41 42 if (rc) 43 return rc; 44 ls = dlm_find_lockspace_local(ls->ls_local_handle); 45 if (!ls) 46 return -EINVAL; 47 48 switch (n) { 49 case 0: 50 dlm_ls_stop(ls); 51 break; 52 case 1: 53 dlm_ls_start(ls); 54 break; 55 default: 56 ret = -EINVAL; 57 } 58 dlm_put_lockspace(ls); 59 return ret; 60 } 61 62 static ssize_t dlm_event_store(struct dlm_ls *ls, const char *buf, size_t len) 63 { 64 int rc = kstrtoint(buf, 0, &ls->ls_uevent_result); 65 66 if (rc) 67 return rc; 68 set_bit(LSFL_UEVENT_WAIT, &ls->ls_flags); 69 wake_up(&ls->ls_uevent_wait); 70 return len; 71 } 72 73 static ssize_t dlm_id_show(struct dlm_ls *ls, char *buf) 74 { 75 return snprintf(buf, PAGE_SIZE, "%u\n", ls->ls_global_id); 76 } 77 78 static ssize_t dlm_id_store(struct dlm_ls *ls, const char *buf, size_t len) 79 { 80 int rc = kstrtouint(buf, 0, &ls->ls_global_id); 81 82 if (rc) 83 return rc; 84 return len; 85 } 86 87 static ssize_t dlm_nodir_show(struct dlm_ls *ls, char *buf) 88 { 89 return snprintf(buf, PAGE_SIZE, "%u\n", dlm_no_directory(ls)); 90 } 91 92 static ssize_t dlm_nodir_store(struct dlm_ls *ls, const char *buf, size_t len) 93 { 94 int val; 95 int rc = kstrtoint(buf, 0, &val); 96 97 if (rc) 98 return rc; 99 if (val == 1) 100 set_bit(LSFL_NODIR, &ls->ls_flags); 101 return len; 102 } 103 104 static ssize_t dlm_recover_status_show(struct dlm_ls *ls, char *buf) 105 { 106 uint32_t status = dlm_recover_status(ls); 107 return snprintf(buf, PAGE_SIZE, "%x\n", status); 108 } 109 110 static ssize_t dlm_recover_nodeid_show(struct dlm_ls *ls, char *buf) 111 { 112 return snprintf(buf, PAGE_SIZE, "%d\n", ls->ls_recover_nodeid); 113 } 114 115 struct dlm_attr { 116 struct attribute attr; 117 ssize_t (*show)(struct dlm_ls *, char *); 118 ssize_t (*store)(struct dlm_ls *, const char *, size_t); 119 }; 120 121 static struct dlm_attr dlm_attr_control = { 122 .attr = {.name = "control", .mode = S_IWUSR}, 123 .store = dlm_control_store 124 }; 125 126 static struct dlm_attr dlm_attr_event = { 127 .attr = {.name = "event_done", .mode = S_IWUSR}, 128 .store = dlm_event_store 129 }; 130 131 static struct dlm_attr dlm_attr_id = { 132 .attr = {.name = "id", .mode = S_IRUGO | S_IWUSR}, 133 .show = dlm_id_show, 134 .store = dlm_id_store 135 }; 136 137 static struct dlm_attr dlm_attr_nodir = { 138 .attr = {.name = "nodir", .mode = S_IRUGO | S_IWUSR}, 139 .show = dlm_nodir_show, 140 .store = dlm_nodir_store 141 }; 142 143 static struct dlm_attr dlm_attr_recover_status = { 144 .attr = {.name = "recover_status", .mode = S_IRUGO}, 145 .show = dlm_recover_status_show 146 }; 147 148 static struct dlm_attr dlm_attr_recover_nodeid = { 149 .attr = {.name = "recover_nodeid", .mode = S_IRUGO}, 150 .show = dlm_recover_nodeid_show 151 }; 152 153 static struct attribute *dlm_attrs[] = { 154 &dlm_attr_control.attr, 155 &dlm_attr_event.attr, 156 &dlm_attr_id.attr, 157 &dlm_attr_nodir.attr, 158 &dlm_attr_recover_status.attr, 159 &dlm_attr_recover_nodeid.attr, 160 NULL, 161 }; 162 ATTRIBUTE_GROUPS(dlm); 163 164 static ssize_t dlm_attr_show(struct kobject *kobj, struct attribute *attr, 165 char *buf) 166 { 167 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj); 168 struct dlm_attr *a = container_of(attr, struct dlm_attr, attr); 169 return a->show ? a->show(ls, buf) : 0; 170 } 171 172 static ssize_t dlm_attr_store(struct kobject *kobj, struct attribute *attr, 173 const char *buf, size_t len) 174 { 175 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj); 176 struct dlm_attr *a = container_of(attr, struct dlm_attr, attr); 177 return a->store ? a->store(ls, buf, len) : len; 178 } 179 180 static void lockspace_kobj_release(struct kobject *k) 181 { 182 struct dlm_ls *ls = container_of(k, struct dlm_ls, ls_kobj); 183 kfree(ls); 184 } 185 186 static const struct sysfs_ops dlm_attr_ops = { 187 .show = dlm_attr_show, 188 .store = dlm_attr_store, 189 }; 190 191 static struct kobj_type dlm_ktype = { 192 .default_groups = dlm_groups, 193 .sysfs_ops = &dlm_attr_ops, 194 .release = lockspace_kobj_release, 195 }; 196 197 static struct kset *dlm_kset; 198 199 static int do_uevent(struct dlm_ls *ls, int in) 200 { 201 if (in) 202 kobject_uevent(&ls->ls_kobj, KOBJ_ONLINE); 203 else 204 kobject_uevent(&ls->ls_kobj, KOBJ_OFFLINE); 205 206 log_rinfo(ls, "%s the lockspace group...", in ? "joining" : "leaving"); 207 208 /* dlm_controld will see the uevent, do the necessary group management 209 and then write to sysfs to wake us */ 210 211 wait_event(ls->ls_uevent_wait, 212 test_and_clear_bit(LSFL_UEVENT_WAIT, &ls->ls_flags)); 213 214 log_rinfo(ls, "group event done %d", ls->ls_uevent_result); 215 216 return ls->ls_uevent_result; 217 } 218 219 static int dlm_uevent(struct kset *kset, struct kobject *kobj, 220 struct kobj_uevent_env *env) 221 { 222 struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj); 223 224 add_uevent_var(env, "LOCKSPACE=%s", ls->ls_name); 225 return 0; 226 } 227 228 static const struct kset_uevent_ops dlm_uevent_ops = { 229 .uevent = dlm_uevent, 230 }; 231 232 int __init dlm_lockspace_init(void) 233 { 234 ls_count = 0; 235 mutex_init(&ls_lock); 236 INIT_LIST_HEAD(&lslist); 237 spin_lock_init(&lslist_lock); 238 239 dlm_kset = kset_create_and_add("dlm", &dlm_uevent_ops, kernel_kobj); 240 if (!dlm_kset) { 241 printk(KERN_WARNING "%s: can not create kset\n", __func__); 242 return -ENOMEM; 243 } 244 return 0; 245 } 246 247 void dlm_lockspace_exit(void) 248 { 249 kset_unregister(dlm_kset); 250 } 251 252 static struct dlm_ls *find_ls_to_scan(void) 253 { 254 struct dlm_ls *ls; 255 256 spin_lock(&lslist_lock); 257 list_for_each_entry(ls, &lslist, ls_list) { 258 if (time_after_eq(jiffies, ls->ls_scan_time + 259 dlm_config.ci_scan_secs * HZ)) { 260 spin_unlock(&lslist_lock); 261 return ls; 262 } 263 } 264 spin_unlock(&lslist_lock); 265 return NULL; 266 } 267 268 static int dlm_scand(void *data) 269 { 270 struct dlm_ls *ls; 271 272 while (!kthread_should_stop()) { 273 ls = find_ls_to_scan(); 274 if (ls) { 275 if (dlm_lock_recovery_try(ls)) { 276 ls->ls_scan_time = jiffies; 277 dlm_scan_rsbs(ls); 278 dlm_scan_timeout(ls); 279 dlm_scan_waiters(ls); 280 dlm_unlock_recovery(ls); 281 } else { 282 ls->ls_scan_time += HZ; 283 } 284 continue; 285 } 286 schedule_timeout_interruptible(dlm_config.ci_scan_secs * HZ); 287 } 288 return 0; 289 } 290 291 static int dlm_scand_start(void) 292 { 293 struct task_struct *p; 294 int error = 0; 295 296 p = kthread_run(dlm_scand, NULL, "dlm_scand"); 297 if (IS_ERR(p)) 298 error = PTR_ERR(p); 299 else 300 scand_task = p; 301 return error; 302 } 303 304 static void dlm_scand_stop(void) 305 { 306 kthread_stop(scand_task); 307 } 308 309 struct dlm_ls *dlm_find_lockspace_global(uint32_t id) 310 { 311 struct dlm_ls *ls; 312 313 spin_lock(&lslist_lock); 314 315 list_for_each_entry(ls, &lslist, ls_list) { 316 if (ls->ls_global_id == id) { 317 ls->ls_count++; 318 goto out; 319 } 320 } 321 ls = NULL; 322 out: 323 spin_unlock(&lslist_lock); 324 return ls; 325 } 326 327 struct dlm_ls *dlm_find_lockspace_local(dlm_lockspace_t *lockspace) 328 { 329 struct dlm_ls *ls; 330 331 spin_lock(&lslist_lock); 332 list_for_each_entry(ls, &lslist, ls_list) { 333 if (ls->ls_local_handle == lockspace) { 334 ls->ls_count++; 335 goto out; 336 } 337 } 338 ls = NULL; 339 out: 340 spin_unlock(&lslist_lock); 341 return ls; 342 } 343 344 struct dlm_ls *dlm_find_lockspace_device(int minor) 345 { 346 struct dlm_ls *ls; 347 348 spin_lock(&lslist_lock); 349 list_for_each_entry(ls, &lslist, ls_list) { 350 if (ls->ls_device.minor == minor) { 351 ls->ls_count++; 352 goto out; 353 } 354 } 355 ls = NULL; 356 out: 357 spin_unlock(&lslist_lock); 358 return ls; 359 } 360 361 void dlm_put_lockspace(struct dlm_ls *ls) 362 { 363 spin_lock(&lslist_lock); 364 ls->ls_count--; 365 spin_unlock(&lslist_lock); 366 } 367 368 static void remove_lockspace(struct dlm_ls *ls) 369 { 370 for (;;) { 371 spin_lock(&lslist_lock); 372 if (ls->ls_count == 0) { 373 WARN_ON(ls->ls_create_count != 0); 374 list_del(&ls->ls_list); 375 spin_unlock(&lslist_lock); 376 return; 377 } 378 spin_unlock(&lslist_lock); 379 ssleep(1); 380 } 381 } 382 383 static int threads_start(void) 384 { 385 int error; 386 387 error = dlm_scand_start(); 388 if (error) { 389 log_print("cannot start dlm_scand thread %d", error); 390 goto fail; 391 } 392 393 /* Thread for sending/receiving messages for all lockspace's */ 394 error = dlm_midcomms_start(); 395 if (error) { 396 log_print("cannot start dlm lowcomms %d", error); 397 goto scand_fail; 398 } 399 400 return 0; 401 402 scand_fail: 403 dlm_scand_stop(); 404 fail: 405 return error; 406 } 407 408 static int new_lockspace(const char *name, const char *cluster, 409 uint32_t flags, int lvblen, 410 const struct dlm_lockspace_ops *ops, void *ops_arg, 411 int *ops_result, dlm_lockspace_t **lockspace) 412 { 413 struct dlm_ls *ls; 414 int i, size, error; 415 int do_unreg = 0; 416 int namelen = strlen(name); 417 418 if (namelen > DLM_LOCKSPACE_LEN || namelen == 0) 419 return -EINVAL; 420 421 if (!lvblen || (lvblen % 8)) 422 return -EINVAL; 423 424 if (!try_module_get(THIS_MODULE)) 425 return -EINVAL; 426 427 if (!dlm_user_daemon_available()) { 428 log_print("dlm user daemon not available"); 429 error = -EUNATCH; 430 goto out; 431 } 432 433 if (ops && ops_result) { 434 if (!dlm_config.ci_recover_callbacks) 435 *ops_result = -EOPNOTSUPP; 436 else 437 *ops_result = 0; 438 } 439 440 if (!cluster) 441 log_print("dlm cluster name '%s' is being used without an application provided cluster name", 442 dlm_config.ci_cluster_name); 443 444 if (dlm_config.ci_recover_callbacks && cluster && 445 strncmp(cluster, dlm_config.ci_cluster_name, DLM_LOCKSPACE_LEN)) { 446 log_print("dlm cluster name '%s' does not match " 447 "the application cluster name '%s'", 448 dlm_config.ci_cluster_name, cluster); 449 error = -EBADR; 450 goto out; 451 } 452 453 error = 0; 454 455 spin_lock(&lslist_lock); 456 list_for_each_entry(ls, &lslist, ls_list) { 457 WARN_ON(ls->ls_create_count <= 0); 458 if (ls->ls_namelen != namelen) 459 continue; 460 if (memcmp(ls->ls_name, name, namelen)) 461 continue; 462 if (flags & DLM_LSFL_NEWEXCL) { 463 error = -EEXIST; 464 break; 465 } 466 ls->ls_create_count++; 467 *lockspace = ls; 468 error = 1; 469 break; 470 } 471 spin_unlock(&lslist_lock); 472 473 if (error) 474 goto out; 475 476 error = -ENOMEM; 477 478 ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_NOFS); 479 if (!ls) 480 goto out; 481 memcpy(ls->ls_name, name, namelen); 482 ls->ls_namelen = namelen; 483 ls->ls_lvblen = lvblen; 484 ls->ls_count = 0; 485 ls->ls_flags = 0; 486 ls->ls_scan_time = jiffies; 487 488 if (ops && dlm_config.ci_recover_callbacks) { 489 ls->ls_ops = ops; 490 ls->ls_ops_arg = ops_arg; 491 } 492 493 if (flags & DLM_LSFL_TIMEWARN) 494 set_bit(LSFL_TIMEWARN, &ls->ls_flags); 495 496 /* ls_exflags are forced to match among nodes, and we don't 497 need to require all nodes to have some flags set */ 498 ls->ls_exflags = (flags & ~(DLM_LSFL_TIMEWARN | DLM_LSFL_FS | 499 DLM_LSFL_NEWEXCL)); 500 501 size = READ_ONCE(dlm_config.ci_rsbtbl_size); 502 ls->ls_rsbtbl_size = size; 503 504 ls->ls_rsbtbl = vmalloc(array_size(size, sizeof(struct dlm_rsbtable))); 505 if (!ls->ls_rsbtbl) 506 goto out_lsfree; 507 for (i = 0; i < size; i++) { 508 ls->ls_rsbtbl[i].keep.rb_node = NULL; 509 ls->ls_rsbtbl[i].toss.rb_node = NULL; 510 spin_lock_init(&ls->ls_rsbtbl[i].lock); 511 } 512 513 spin_lock_init(&ls->ls_remove_spin); 514 515 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) { 516 ls->ls_remove_names[i] = kzalloc(DLM_RESNAME_MAXLEN+1, 517 GFP_KERNEL); 518 if (!ls->ls_remove_names[i]) 519 goto out_rsbtbl; 520 } 521 522 idr_init(&ls->ls_lkbidr); 523 spin_lock_init(&ls->ls_lkbidr_spin); 524 525 INIT_LIST_HEAD(&ls->ls_waiters); 526 mutex_init(&ls->ls_waiters_mutex); 527 INIT_LIST_HEAD(&ls->ls_orphans); 528 mutex_init(&ls->ls_orphans_mutex); 529 INIT_LIST_HEAD(&ls->ls_timeout); 530 mutex_init(&ls->ls_timeout_mutex); 531 532 INIT_LIST_HEAD(&ls->ls_new_rsb); 533 spin_lock_init(&ls->ls_new_rsb_spin); 534 535 INIT_LIST_HEAD(&ls->ls_nodes); 536 INIT_LIST_HEAD(&ls->ls_nodes_gone); 537 ls->ls_num_nodes = 0; 538 ls->ls_low_nodeid = 0; 539 ls->ls_total_weight = 0; 540 ls->ls_node_array = NULL; 541 542 memset(&ls->ls_stub_rsb, 0, sizeof(struct dlm_rsb)); 543 ls->ls_stub_rsb.res_ls = ls; 544 545 ls->ls_debug_rsb_dentry = NULL; 546 ls->ls_debug_waiters_dentry = NULL; 547 548 init_waitqueue_head(&ls->ls_uevent_wait); 549 ls->ls_uevent_result = 0; 550 init_completion(&ls->ls_members_done); 551 ls->ls_members_result = -1; 552 553 mutex_init(&ls->ls_cb_mutex); 554 INIT_LIST_HEAD(&ls->ls_cb_delay); 555 556 ls->ls_recoverd_task = NULL; 557 mutex_init(&ls->ls_recoverd_active); 558 spin_lock_init(&ls->ls_recover_lock); 559 spin_lock_init(&ls->ls_rcom_spin); 560 get_random_bytes(&ls->ls_rcom_seq, sizeof(uint64_t)); 561 ls->ls_recover_status = 0; 562 ls->ls_recover_seq = 0; 563 ls->ls_recover_args = NULL; 564 init_rwsem(&ls->ls_in_recovery); 565 init_rwsem(&ls->ls_recv_active); 566 INIT_LIST_HEAD(&ls->ls_requestqueue); 567 mutex_init(&ls->ls_requestqueue_mutex); 568 mutex_init(&ls->ls_clear_proc_locks); 569 570 /* Due backwards compatibility with 3.1 we need to use maximum 571 * possible dlm message size to be sure the message will fit and 572 * not having out of bounds issues. However on sending side 3.2 573 * might send less. 574 */ 575 ls->ls_recover_buf = kmalloc(DLM_MAX_SOCKET_BUFSIZE, GFP_NOFS); 576 if (!ls->ls_recover_buf) 577 goto out_lkbidr; 578 579 ls->ls_slot = 0; 580 ls->ls_num_slots = 0; 581 ls->ls_slots_size = 0; 582 ls->ls_slots = NULL; 583 584 INIT_LIST_HEAD(&ls->ls_recover_list); 585 spin_lock_init(&ls->ls_recover_list_lock); 586 idr_init(&ls->ls_recover_idr); 587 spin_lock_init(&ls->ls_recover_idr_lock); 588 ls->ls_recover_list_count = 0; 589 ls->ls_local_handle = ls; 590 init_waitqueue_head(&ls->ls_wait_general); 591 INIT_LIST_HEAD(&ls->ls_root_list); 592 init_rwsem(&ls->ls_root_sem); 593 594 spin_lock(&lslist_lock); 595 ls->ls_create_count = 1; 596 list_add(&ls->ls_list, &lslist); 597 spin_unlock(&lslist_lock); 598 599 if (flags & DLM_LSFL_FS) { 600 error = dlm_callback_start(ls); 601 if (error) { 602 log_error(ls, "can't start dlm_callback %d", error); 603 goto out_delist; 604 } 605 } 606 607 init_waitqueue_head(&ls->ls_recover_lock_wait); 608 609 /* 610 * Once started, dlm_recoverd first looks for ls in lslist, then 611 * initializes ls_in_recovery as locked in "down" mode. We need 612 * to wait for the wakeup from dlm_recoverd because in_recovery 613 * has to start out in down mode. 614 */ 615 616 error = dlm_recoverd_start(ls); 617 if (error) { 618 log_error(ls, "can't start dlm_recoverd %d", error); 619 goto out_callback; 620 } 621 622 wait_event(ls->ls_recover_lock_wait, 623 test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags)); 624 625 /* let kobject handle freeing of ls if there's an error */ 626 do_unreg = 1; 627 628 ls->ls_kobj.kset = dlm_kset; 629 error = kobject_init_and_add(&ls->ls_kobj, &dlm_ktype, NULL, 630 "%s", ls->ls_name); 631 if (error) 632 goto out_recoverd; 633 kobject_uevent(&ls->ls_kobj, KOBJ_ADD); 634 635 /* This uevent triggers dlm_controld in userspace to add us to the 636 group of nodes that are members of this lockspace (managed by the 637 cluster infrastructure.) Once it's done that, it tells us who the 638 current lockspace members are (via configfs) and then tells the 639 lockspace to start running (via sysfs) in dlm_ls_start(). */ 640 641 error = do_uevent(ls, 1); 642 if (error) 643 goto out_recoverd; 644 645 wait_for_completion(&ls->ls_members_done); 646 error = ls->ls_members_result; 647 if (error) 648 goto out_members; 649 650 dlm_create_debug_file(ls); 651 652 log_rinfo(ls, "join complete"); 653 *lockspace = ls; 654 return 0; 655 656 out_members: 657 do_uevent(ls, 0); 658 dlm_clear_members(ls); 659 kfree(ls->ls_node_array); 660 out_recoverd: 661 dlm_recoverd_stop(ls); 662 out_callback: 663 dlm_callback_stop(ls); 664 out_delist: 665 spin_lock(&lslist_lock); 666 list_del(&ls->ls_list); 667 spin_unlock(&lslist_lock); 668 idr_destroy(&ls->ls_recover_idr); 669 kfree(ls->ls_recover_buf); 670 out_lkbidr: 671 idr_destroy(&ls->ls_lkbidr); 672 out_rsbtbl: 673 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) 674 kfree(ls->ls_remove_names[i]); 675 vfree(ls->ls_rsbtbl); 676 out_lsfree: 677 if (do_unreg) 678 kobject_put(&ls->ls_kobj); 679 else 680 kfree(ls); 681 out: 682 module_put(THIS_MODULE); 683 return error; 684 } 685 686 int dlm_new_lockspace(const char *name, const char *cluster, 687 uint32_t flags, int lvblen, 688 const struct dlm_lockspace_ops *ops, void *ops_arg, 689 int *ops_result, dlm_lockspace_t **lockspace) 690 { 691 int error = 0; 692 693 mutex_lock(&ls_lock); 694 if (!ls_count) 695 error = threads_start(); 696 if (error) 697 goto out; 698 699 error = new_lockspace(name, cluster, flags, lvblen, ops, ops_arg, 700 ops_result, lockspace); 701 if (!error) 702 ls_count++; 703 if (error > 0) 704 error = 0; 705 if (!ls_count) { 706 dlm_scand_stop(); 707 dlm_midcomms_shutdown(); 708 dlm_lowcomms_stop(); 709 } 710 out: 711 mutex_unlock(&ls_lock); 712 return error; 713 } 714 715 static int lkb_idr_is_local(int id, void *p, void *data) 716 { 717 struct dlm_lkb *lkb = p; 718 719 return lkb->lkb_nodeid == 0 && lkb->lkb_grmode != DLM_LOCK_IV; 720 } 721 722 static int lkb_idr_is_any(int id, void *p, void *data) 723 { 724 return 1; 725 } 726 727 static int lkb_idr_free(int id, void *p, void *data) 728 { 729 struct dlm_lkb *lkb = p; 730 731 if (lkb->lkb_lvbptr && lkb->lkb_flags & DLM_IFL_MSTCPY) 732 dlm_free_lvb(lkb->lkb_lvbptr); 733 734 dlm_free_lkb(lkb); 735 return 0; 736 } 737 738 /* NOTE: We check the lkbidr here rather than the resource table. 739 This is because there may be LKBs queued as ASTs that have been unlinked 740 from their RSBs and are pending deletion once the AST has been delivered */ 741 742 static int lockspace_busy(struct dlm_ls *ls, int force) 743 { 744 int rv; 745 746 spin_lock(&ls->ls_lkbidr_spin); 747 if (force == 0) { 748 rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_any, ls); 749 } else if (force == 1) { 750 rv = idr_for_each(&ls->ls_lkbidr, lkb_idr_is_local, ls); 751 } else { 752 rv = 0; 753 } 754 spin_unlock(&ls->ls_lkbidr_spin); 755 return rv; 756 } 757 758 static int release_lockspace(struct dlm_ls *ls, int force) 759 { 760 struct dlm_rsb *rsb; 761 struct rb_node *n; 762 int i, busy, rv; 763 764 busy = lockspace_busy(ls, force); 765 766 spin_lock(&lslist_lock); 767 if (ls->ls_create_count == 1) { 768 if (busy) { 769 rv = -EBUSY; 770 } else { 771 /* remove_lockspace takes ls off lslist */ 772 ls->ls_create_count = 0; 773 rv = 0; 774 } 775 } else if (ls->ls_create_count > 1) { 776 rv = --ls->ls_create_count; 777 } else { 778 rv = -EINVAL; 779 } 780 spin_unlock(&lslist_lock); 781 782 if (rv) { 783 log_debug(ls, "release_lockspace no remove %d", rv); 784 return rv; 785 } 786 787 dlm_device_deregister(ls); 788 789 if (force < 3 && dlm_user_daemon_available()) 790 do_uevent(ls, 0); 791 792 dlm_recoverd_stop(ls); 793 794 if (ls_count == 1) { 795 dlm_scand_stop(); 796 dlm_clear_members(ls); 797 dlm_midcomms_shutdown(); 798 } 799 800 dlm_callback_stop(ls); 801 802 remove_lockspace(ls); 803 804 dlm_delete_debug_file(ls); 805 806 idr_destroy(&ls->ls_recover_idr); 807 kfree(ls->ls_recover_buf); 808 809 /* 810 * Free all lkb's in idr 811 */ 812 813 idr_for_each(&ls->ls_lkbidr, lkb_idr_free, ls); 814 idr_destroy(&ls->ls_lkbidr); 815 816 /* 817 * Free all rsb's on rsbtbl[] lists 818 */ 819 820 for (i = 0; i < ls->ls_rsbtbl_size; i++) { 821 while ((n = rb_first(&ls->ls_rsbtbl[i].keep))) { 822 rsb = rb_entry(n, struct dlm_rsb, res_hashnode); 823 rb_erase(n, &ls->ls_rsbtbl[i].keep); 824 dlm_free_rsb(rsb); 825 } 826 827 while ((n = rb_first(&ls->ls_rsbtbl[i].toss))) { 828 rsb = rb_entry(n, struct dlm_rsb, res_hashnode); 829 rb_erase(n, &ls->ls_rsbtbl[i].toss); 830 dlm_free_rsb(rsb); 831 } 832 } 833 834 vfree(ls->ls_rsbtbl); 835 836 for (i = 0; i < DLM_REMOVE_NAMES_MAX; i++) 837 kfree(ls->ls_remove_names[i]); 838 839 while (!list_empty(&ls->ls_new_rsb)) { 840 rsb = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb, 841 res_hashchain); 842 list_del(&rsb->res_hashchain); 843 dlm_free_rsb(rsb); 844 } 845 846 /* 847 * Free structures on any other lists 848 */ 849 850 dlm_purge_requestqueue(ls); 851 kfree(ls->ls_recover_args); 852 dlm_clear_members(ls); 853 dlm_clear_members_gone(ls); 854 kfree(ls->ls_node_array); 855 log_rinfo(ls, "release_lockspace final free"); 856 kobject_put(&ls->ls_kobj); 857 /* The ls structure will be freed when the kobject is done with */ 858 859 module_put(THIS_MODULE); 860 return 0; 861 } 862 863 /* 864 * Called when a system has released all its locks and is not going to use the 865 * lockspace any longer. We free everything we're managing for this lockspace. 866 * Remaining nodes will go through the recovery process as if we'd died. The 867 * lockspace must continue to function as usual, participating in recoveries, 868 * until this returns. 869 * 870 * Force has 4 possible values: 871 * 0 - don't destroy locksapce if it has any LKBs 872 * 1 - destroy lockspace if it has remote LKBs but not if it has local LKBs 873 * 2 - destroy lockspace regardless of LKBs 874 * 3 - destroy lockspace as part of a forced shutdown 875 */ 876 877 int dlm_release_lockspace(void *lockspace, int force) 878 { 879 struct dlm_ls *ls; 880 int error; 881 882 ls = dlm_find_lockspace_local(lockspace); 883 if (!ls) 884 return -EINVAL; 885 dlm_put_lockspace(ls); 886 887 mutex_lock(&ls_lock); 888 error = release_lockspace(ls, force); 889 if (!error) 890 ls_count--; 891 if (!ls_count) 892 dlm_lowcomms_stop(); 893 mutex_unlock(&ls_lock); 894 895 return error; 896 } 897 898 void dlm_stop_lockspaces(void) 899 { 900 struct dlm_ls *ls; 901 int count; 902 903 restart: 904 count = 0; 905 spin_lock(&lslist_lock); 906 list_for_each_entry(ls, &lslist, ls_list) { 907 if (!test_bit(LSFL_RUNNING, &ls->ls_flags)) { 908 count++; 909 continue; 910 } 911 spin_unlock(&lslist_lock); 912 log_error(ls, "no userland control daemon, stopping lockspace"); 913 dlm_ls_stop(ls); 914 goto restart; 915 } 916 spin_unlock(&lslist_lock); 917 918 if (count) 919 log_print("dlm user daemon left %d lockspaces", count); 920 } 921 922