1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) 2015, SUSE 4 */ 5 6 7#include <linux/module.h> 8#include <linux/kthread.h> 9#include <linux/dlm.h> 10#include <linux/sched.h> 11#include <linux/raid/md_p.h> 12#include "md.h" 13#include "md-bitmap.h" 14#include "md-cluster.h" 15 16#define LVB_SIZE 64 17#define NEW_DEV_TIMEOUT 5000 18 19struct dlm_lock_resource { 20 dlm_lockspace_t *ls; 21 struct dlm_lksb lksb; 22 char *name; /* lock name. */ 23 uint32_t flags; /* flags to pass to dlm_lock() */ 24 wait_queue_head_t sync_locking; /* wait queue for synchronized locking */ 25 bool sync_locking_done; 26 void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ 27 struct mddev *mddev; /* pointing back to mddev. */ 28 int mode; 29}; 30 31struct resync_info { 32 __le64 lo; 33 __le64 hi; 34}; 35 36/* md_cluster_info flags */ 37#define MD_CLUSTER_WAITING_FOR_NEWDISK 1 38#define MD_CLUSTER_SUSPEND_READ_BALANCING 2 39#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3 40 41/* Lock the send communication. This is done through 42 * bit manipulation as opposed to a mutex in order to 43 * accommodate lock and hold. See next comment. 44 */ 45#define MD_CLUSTER_SEND_LOCK 4 46/* If cluster operations (such as adding a disk) must lock the 47 * communication channel, so as to perform extra operations 48 * (update metadata) and no other operation is allowed on the 49 * MD. Token needs to be locked and held until the operation 50 * completes witha md_update_sb(), which would eventually release 51 * the lock. 52 */ 53#define MD_CLUSTER_SEND_LOCKED_ALREADY 5 54/* We should receive message after node joined cluster and 55 * set up all the related infos such as bitmap and personality */ 56#define MD_CLUSTER_ALREADY_IN_CLUSTER 6 57#define MD_CLUSTER_PENDING_RECV_EVENT 7 58#define MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD 8 59 60struct md_cluster_info { 61 struct mddev *mddev; /* the md device which md_cluster_info belongs to */ 62 /* dlm lock space and resources for clustered raid. */ 63 dlm_lockspace_t *lockspace; 64 int slot_number; 65 struct completion completion; 66 struct mutex recv_mutex; 67 struct dlm_lock_resource *bitmap_lockres; 68 struct dlm_lock_resource **other_bitmap_lockres; 69 struct dlm_lock_resource *resync_lockres; 70 struct list_head suspend_list; 71 72 spinlock_t suspend_lock; 73 /* record the region which write should be suspended */ 74 sector_t suspend_lo; 75 sector_t suspend_hi; 76 int suspend_from; /* the slot which broadcast suspend_lo/hi */ 77 78 struct md_thread __rcu *recovery_thread; 79 unsigned long recovery_map; 80 /* communication loc resources */ 81 struct dlm_lock_resource *ack_lockres; 82 struct dlm_lock_resource *message_lockres; 83 struct dlm_lock_resource *token_lockres; 84 struct dlm_lock_resource *no_new_dev_lockres; 85 struct md_thread __rcu *recv_thread; 86 struct completion newdisk_completion; 87 wait_queue_head_t wait; 88 unsigned long state; 89 /* record the region in RESYNCING message */ 90 sector_t sync_low; 91 sector_t sync_hi; 92}; 93 94enum msg_type { 95 METADATA_UPDATED = 0, 96 RESYNCING, 97 NEWDISK, 98 REMOVE, 99 RE_ADD, 100 BITMAP_NEEDS_SYNC, 101 CHANGE_CAPACITY, 102 BITMAP_RESIZE, 103}; 104 105struct cluster_msg { 106 __le32 type; 107 __le32 slot; 108 /* TODO: Unionize this for smaller footprint */ 109 __le64 low; 110 __le64 high; 111 char uuid[16]; 112 __le32 raid_slot; 113}; 114 115static void sync_ast(void *arg) 116{ 117 struct dlm_lock_resource *res; 118 119 res = arg; 120 res->sync_locking_done = true; 121 wake_up(&res->sync_locking); 122} 123 124static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) 125{ 126 int ret = 0; 127 128 ret = dlm_lock(res->ls, mode, &res->lksb, 129 res->flags, res->name, strlen(res->name), 130 0, sync_ast, res, res->bast); 131 if (ret) 132 return ret; 133 wait_event(res->sync_locking, res->sync_locking_done); 134 res->sync_locking_done = false; 135 if (res->lksb.sb_status == 0) 136 res->mode = mode; 137 return res->lksb.sb_status; 138} 139 140static int dlm_unlock_sync(struct dlm_lock_resource *res) 141{ 142 return dlm_lock_sync(res, DLM_LOCK_NL); 143} 144 145/* 146 * An variation of dlm_lock_sync, which make lock request could 147 * be interrupted 148 */ 149static int dlm_lock_sync_interruptible(struct dlm_lock_resource *res, int mode, 150 struct mddev *mddev) 151{ 152 int ret = 0; 153 154 ret = dlm_lock(res->ls, mode, &res->lksb, 155 res->flags, res->name, strlen(res->name), 156 0, sync_ast, res, res->bast); 157 if (ret) 158 return ret; 159 160 wait_event(res->sync_locking, res->sync_locking_done 161 || kthread_should_stop() 162 || test_bit(MD_CLOSING, &mddev->flags)); 163 if (!res->sync_locking_done) { 164 /* 165 * the convert queue contains the lock request when request is 166 * interrupted, and sync_ast could still be run, so need to 167 * cancel the request and reset completion 168 */ 169 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_CANCEL, 170 &res->lksb, res); 171 res->sync_locking_done = false; 172 if (unlikely(ret != 0)) 173 pr_info("failed to cancel previous lock request " 174 "%s return %d\n", res->name, ret); 175 return -EPERM; 176 } else 177 res->sync_locking_done = false; 178 if (res->lksb.sb_status == 0) 179 res->mode = mode; 180 return res->lksb.sb_status; 181} 182 183static struct dlm_lock_resource *lockres_init(struct mddev *mddev, 184 char *name, void (*bastfn)(void *arg, int mode), int with_lvb) 185{ 186 struct dlm_lock_resource *res = NULL; 187 int ret, namelen; 188 struct md_cluster_info *cinfo = mddev->cluster_info; 189 190 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); 191 if (!res) 192 return NULL; 193 init_waitqueue_head(&res->sync_locking); 194 res->sync_locking_done = false; 195 res->ls = cinfo->lockspace; 196 res->mddev = mddev; 197 res->mode = DLM_LOCK_IV; 198 namelen = strlen(name); 199 res->name = kzalloc(namelen + 1, GFP_KERNEL); 200 if (!res->name) { 201 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); 202 goto out_err; 203 } 204 strscpy(res->name, name, namelen + 1); 205 if (with_lvb) { 206 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL); 207 if (!res->lksb.sb_lvbptr) { 208 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name); 209 goto out_err; 210 } 211 res->flags = DLM_LKF_VALBLK; 212 } 213 214 if (bastfn) 215 res->bast = bastfn; 216 217 res->flags |= DLM_LKF_EXPEDITE; 218 219 ret = dlm_lock_sync(res, DLM_LOCK_NL); 220 if (ret) { 221 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name); 222 goto out_err; 223 } 224 res->flags &= ~DLM_LKF_EXPEDITE; 225 res->flags |= DLM_LKF_CONVERT; 226 227 return res; 228out_err: 229 kfree(res->lksb.sb_lvbptr); 230 kfree(res->name); 231 kfree(res); 232 return NULL; 233} 234 235static void lockres_free(struct dlm_lock_resource *res) 236{ 237 int ret = 0; 238 239 if (!res) 240 return; 241 242 /* 243 * use FORCEUNLOCK flag, so we can unlock even the lock is on the 244 * waiting or convert queue 245 */ 246 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_FORCEUNLOCK, 247 &res->lksb, res); 248 if (unlikely(ret != 0)) 249 pr_err("failed to unlock %s return %d\n", res->name, ret); 250 else 251 wait_event(res->sync_locking, res->sync_locking_done); 252 253 kfree(res->name); 254 kfree(res->lksb.sb_lvbptr); 255 kfree(res); 256} 257 258static void add_resync_info(struct dlm_lock_resource *lockres, 259 sector_t lo, sector_t hi) 260{ 261 struct resync_info *ri; 262 263 ri = (struct resync_info *)lockres->lksb.sb_lvbptr; 264 ri->lo = cpu_to_le64(lo); 265 ri->hi = cpu_to_le64(hi); 266} 267 268static int read_resync_info(struct mddev *mddev, 269 struct dlm_lock_resource *lockres) 270{ 271 struct resync_info ri; 272 struct md_cluster_info *cinfo = mddev->cluster_info; 273 int ret = 0; 274 275 dlm_lock_sync(lockres, DLM_LOCK_CR); 276 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); 277 if (le64_to_cpu(ri.hi) > 0) { 278 cinfo->suspend_hi = le64_to_cpu(ri.hi); 279 cinfo->suspend_lo = le64_to_cpu(ri.lo); 280 ret = 1; 281 } 282 dlm_unlock_sync(lockres); 283 return ret; 284} 285 286static void recover_bitmaps(struct md_thread *thread) 287{ 288 struct mddev *mddev = thread->mddev; 289 struct md_cluster_info *cinfo = mddev->cluster_info; 290 struct dlm_lock_resource *bm_lockres; 291 char str[64]; 292 int slot, ret; 293 sector_t lo, hi; 294 295 while (cinfo->recovery_map) { 296 slot = fls64((u64)cinfo->recovery_map) - 1; 297 298 snprintf(str, 64, "bitmap%04d", slot); 299 bm_lockres = lockres_init(mddev, str, NULL, 1); 300 if (!bm_lockres) { 301 pr_err("md-cluster: Cannot initialize bitmaps\n"); 302 goto clear_bit; 303 } 304 305 ret = dlm_lock_sync_interruptible(bm_lockres, DLM_LOCK_PW, mddev); 306 if (ret) { 307 pr_err("md-cluster: Could not DLM lock %s: %d\n", 308 str, ret); 309 goto clear_bit; 310 } 311 ret = md_bitmap_copy_from_slot(mddev, slot, &lo, &hi, true); 312 if (ret) { 313 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot); 314 goto clear_bit; 315 } 316 317 /* Clear suspend_area associated with the bitmap */ 318 spin_lock_irq(&cinfo->suspend_lock); 319 cinfo->suspend_hi = 0; 320 cinfo->suspend_lo = 0; 321 cinfo->suspend_from = -1; 322 spin_unlock_irq(&cinfo->suspend_lock); 323 324 /* Kick off a reshape if needed */ 325 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && 326 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && 327 mddev->reshape_position != MaxSector) 328 md_wakeup_thread(mddev->sync_thread); 329 330 if (hi > 0) { 331 if (lo < mddev->recovery_cp) 332 mddev->recovery_cp = lo; 333 /* wake up thread to continue resync in case resync 334 * is not finished */ 335 if (mddev->recovery_cp != MaxSector) { 336 /* 337 * clear the REMOTE flag since we will launch 338 * resync thread in current node. 339 */ 340 clear_bit(MD_RESYNCING_REMOTE, 341 &mddev->recovery); 342 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 343 md_wakeup_thread(mddev->thread); 344 } 345 } 346clear_bit: 347 lockres_free(bm_lockres); 348 clear_bit(slot, &cinfo->recovery_map); 349 } 350} 351 352static void recover_prep(void *arg) 353{ 354 struct mddev *mddev = arg; 355 struct md_cluster_info *cinfo = mddev->cluster_info; 356 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); 357} 358 359static void __recover_slot(struct mddev *mddev, int slot) 360{ 361 struct md_cluster_info *cinfo = mddev->cluster_info; 362 363 set_bit(slot, &cinfo->recovery_map); 364 if (!cinfo->recovery_thread) { 365 rcu_assign_pointer(cinfo->recovery_thread, 366 md_register_thread(recover_bitmaps, mddev, "recover")); 367 if (!cinfo->recovery_thread) { 368 pr_warn("md-cluster: Could not create recovery thread\n"); 369 return; 370 } 371 } 372 md_wakeup_thread(cinfo->recovery_thread); 373} 374 375static void recover_slot(void *arg, struct dlm_slot *slot) 376{ 377 struct mddev *mddev = arg; 378 struct md_cluster_info *cinfo = mddev->cluster_info; 379 380 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", 381 mddev->bitmap_info.cluster_name, 382 slot->nodeid, slot->slot, 383 cinfo->slot_number); 384 /* deduct one since dlm slot starts from one while the num of 385 * cluster-md begins with 0 */ 386 __recover_slot(mddev, slot->slot - 1); 387} 388 389static void recover_done(void *arg, struct dlm_slot *slots, 390 int num_slots, int our_slot, 391 uint32_t generation) 392{ 393 struct mddev *mddev = arg; 394 struct md_cluster_info *cinfo = mddev->cluster_info; 395 396 cinfo->slot_number = our_slot; 397 /* completion is only need to be complete when node join cluster, 398 * it doesn't need to run during another node's failure */ 399 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) { 400 complete(&cinfo->completion); 401 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); 402 } 403 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); 404} 405 406/* the ops is called when node join the cluster, and do lock recovery 407 * if node failure occurs */ 408static const struct dlm_lockspace_ops md_ls_ops = { 409 .recover_prep = recover_prep, 410 .recover_slot = recover_slot, 411 .recover_done = recover_done, 412}; 413 414/* 415 * The BAST function for the ack lock resource 416 * This function wakes up the receive thread in 417 * order to receive and process the message. 418 */ 419static void ack_bast(void *arg, int mode) 420{ 421 struct dlm_lock_resource *res = arg; 422 struct md_cluster_info *cinfo = res->mddev->cluster_info; 423 424 if (mode == DLM_LOCK_EX) { 425 if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state)) 426 md_wakeup_thread(cinfo->recv_thread); 427 else 428 set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state); 429 } 430} 431 432static void remove_suspend_info(struct mddev *mddev, int slot) 433{ 434 struct md_cluster_info *cinfo = mddev->cluster_info; 435 mddev->pers->quiesce(mddev, 1); 436 spin_lock_irq(&cinfo->suspend_lock); 437 cinfo->suspend_hi = 0; 438 cinfo->suspend_lo = 0; 439 spin_unlock_irq(&cinfo->suspend_lock); 440 mddev->pers->quiesce(mddev, 0); 441} 442 443static void process_suspend_info(struct mddev *mddev, 444 int slot, sector_t lo, sector_t hi) 445{ 446 struct md_cluster_info *cinfo = mddev->cluster_info; 447 struct mdp_superblock_1 *sb = NULL; 448 struct md_rdev *rdev; 449 450 if (!hi) { 451 /* 452 * clear the REMOTE flag since resync or recovery is finished 453 * in remote node. 454 */ 455 clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery); 456 remove_suspend_info(mddev, slot); 457 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 458 md_wakeup_thread(mddev->thread); 459 return; 460 } 461 462 rdev_for_each(rdev, mddev) 463 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) { 464 sb = page_address(rdev->sb_page); 465 break; 466 } 467 468 /* 469 * The bitmaps are not same for different nodes 470 * if RESYNCING is happening in one node, then 471 * the node which received the RESYNCING message 472 * probably will perform resync with the region 473 * [lo, hi] again, so we could reduce resync time 474 * a lot if we can ensure that the bitmaps among 475 * different nodes are match up well. 476 * 477 * sync_low/hi is used to record the region which 478 * arrived in the previous RESYNCING message, 479 * 480 * Call md_bitmap_sync_with_cluster to clear NEEDED_MASK 481 * and set RESYNC_MASK since resync thread is running 482 * in another node, so we don't need to do the resync 483 * again with the same section. 484 * 485 * Skip md_bitmap_sync_with_cluster in case reshape 486 * happening, because reshaping region is small and 487 * we don't want to trigger lots of WARN. 488 */ 489 if (sb && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) 490 md_bitmap_sync_with_cluster(mddev, cinfo->sync_low, 491 cinfo->sync_hi, lo, hi); 492 cinfo->sync_low = lo; 493 cinfo->sync_hi = hi; 494 495 mddev->pers->quiesce(mddev, 1); 496 spin_lock_irq(&cinfo->suspend_lock); 497 cinfo->suspend_from = slot; 498 cinfo->suspend_lo = lo; 499 cinfo->suspend_hi = hi; 500 spin_unlock_irq(&cinfo->suspend_lock); 501 mddev->pers->quiesce(mddev, 0); 502} 503 504static int process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg) 505{ 506 char disk_uuid[64]; 507 struct md_cluster_info *cinfo = mddev->cluster_info; 508 char event_name[] = "EVENT=ADD_DEVICE"; 509 char raid_slot[16]; 510 char *envp[] = {event_name, disk_uuid, raid_slot, NULL}; 511 int len; 512 int res = 0; 513 514 len = snprintf(disk_uuid, 64, "DEVICE_UUID="); 515 sprintf(disk_uuid + len, "%pU", cmsg->uuid); 516 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot)); 517 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot); 518 init_completion(&cinfo->newdisk_completion); 519 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); 520 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp); 521 if (!wait_for_completion_timeout(&cinfo->newdisk_completion, 522 NEW_DEV_TIMEOUT)) { 523 pr_err("md-cluster(%s:%d): timeout on a new disk adding\n", 524 __func__, __LINE__); 525 res = -1; 526 } 527 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); 528 return res; 529} 530 531 532static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg) 533{ 534 int got_lock = 0; 535 struct md_thread *thread; 536 struct md_cluster_info *cinfo = mddev->cluster_info; 537 mddev->good_device_nr = le32_to_cpu(msg->raid_slot); 538 539 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); 540 541 /* daemaon thread must exist */ 542 thread = rcu_dereference_protected(mddev->thread, true); 543 wait_event(thread->wqueue, 544 (got_lock = mddev_trylock(mddev)) || 545 test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state)); 546 md_reload_sb(mddev, mddev->good_device_nr); 547 if (got_lock) 548 mddev_unlock(mddev); 549} 550 551static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg) 552{ 553 struct md_rdev *rdev; 554 555 rcu_read_lock(); 556 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot)); 557 if (rdev) { 558 set_bit(ClusterRemove, &rdev->flags); 559 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 560 md_wakeup_thread(mddev->thread); 561 } 562 else 563 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", 564 __func__, __LINE__, le32_to_cpu(msg->raid_slot)); 565 rcu_read_unlock(); 566} 567 568static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg) 569{ 570 struct md_rdev *rdev; 571 572 rcu_read_lock(); 573 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot)); 574 if (rdev && test_bit(Faulty, &rdev->flags)) 575 clear_bit(Faulty, &rdev->flags); 576 else 577 pr_warn("%s: %d Could not find disk(%d) which is faulty", 578 __func__, __LINE__, le32_to_cpu(msg->raid_slot)); 579 rcu_read_unlock(); 580} 581 582static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) 583{ 584 int ret = 0; 585 586 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot), 587 "node %d received its own msg\n", le32_to_cpu(msg->slot))) 588 return -1; 589 switch (le32_to_cpu(msg->type)) { 590 case METADATA_UPDATED: 591 process_metadata_update(mddev, msg); 592 break; 593 case CHANGE_CAPACITY: 594 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); 595 break; 596 case RESYNCING: 597 set_bit(MD_RESYNCING_REMOTE, &mddev->recovery); 598 process_suspend_info(mddev, le32_to_cpu(msg->slot), 599 le64_to_cpu(msg->low), 600 le64_to_cpu(msg->high)); 601 break; 602 case NEWDISK: 603 if (process_add_new_disk(mddev, msg)) 604 ret = -1; 605 break; 606 case REMOVE: 607 process_remove_disk(mddev, msg); 608 break; 609 case RE_ADD: 610 process_readd_disk(mddev, msg); 611 break; 612 case BITMAP_NEEDS_SYNC: 613 __recover_slot(mddev, le32_to_cpu(msg->slot)); 614 break; 615 case BITMAP_RESIZE: 616 if (le64_to_cpu(msg->high) != mddev->pers->size(mddev, 0, 0)) 617 ret = md_bitmap_resize(mddev->bitmap, 618 le64_to_cpu(msg->high), 0, 0); 619 break; 620 default: 621 ret = -1; 622 pr_warn("%s:%d Received unknown message from %d\n", 623 __func__, __LINE__, msg->slot); 624 } 625 return ret; 626} 627 628/* 629 * thread for receiving message 630 */ 631static void recv_daemon(struct md_thread *thread) 632{ 633 struct md_cluster_info *cinfo = thread->mddev->cluster_info; 634 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres; 635 struct dlm_lock_resource *message_lockres = cinfo->message_lockres; 636 struct cluster_msg msg; 637 int ret; 638 639 mutex_lock(&cinfo->recv_mutex); 640 /*get CR on Message*/ 641 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { 642 pr_err("md/raid1:failed to get CR on MESSAGE\n"); 643 mutex_unlock(&cinfo->recv_mutex); 644 return; 645 } 646 647 /* read lvb and wake up thread to process this message_lockres */ 648 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); 649 ret = process_recvd_msg(thread->mddev, &msg); 650 if (ret) 651 goto out; 652 653 /*release CR on ack_lockres*/ 654 ret = dlm_unlock_sync(ack_lockres); 655 if (unlikely(ret != 0)) 656 pr_info("unlock ack failed return %d\n", ret); 657 /*up-convert to PR on message_lockres*/ 658 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR); 659 if (unlikely(ret != 0)) 660 pr_info("lock PR on msg failed return %d\n", ret); 661 /*get CR on ack_lockres again*/ 662 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR); 663 if (unlikely(ret != 0)) 664 pr_info("lock CR on ack failed return %d\n", ret); 665out: 666 /*release CR on message_lockres*/ 667 ret = dlm_unlock_sync(message_lockres); 668 if (unlikely(ret != 0)) 669 pr_info("unlock msg failed return %d\n", ret); 670 mutex_unlock(&cinfo->recv_mutex); 671} 672 673/* lock_token() 674 * Takes the lock on the TOKEN lock resource so no other 675 * node can communicate while the operation is underway. 676 */ 677static int lock_token(struct md_cluster_info *cinfo) 678{ 679 int error; 680 681 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); 682 if (error) { 683 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n", 684 __func__, __LINE__, error); 685 } else { 686 /* Lock the receive sequence */ 687 mutex_lock(&cinfo->recv_mutex); 688 } 689 return error; 690} 691 692/* lock_comm() 693 * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel. 694 */ 695static int lock_comm(struct md_cluster_info *cinfo, bool mddev_locked) 696{ 697 int rv, set_bit = 0; 698 struct mddev *mddev = cinfo->mddev; 699 700 /* 701 * If resync thread run after raid1d thread, then process_metadata_update 702 * could not continue if raid1d held reconfig_mutex (and raid1d is blocked 703 * since another node already got EX on Token and waiting the EX of Ack), 704 * so let resync wake up thread in case flag is set. 705 */ 706 if (mddev_locked && !test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, 707 &cinfo->state)) { 708 rv = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, 709 &cinfo->state); 710 WARN_ON_ONCE(rv); 711 md_wakeup_thread(mddev->thread); 712 set_bit = 1; 713 } 714 715 wait_event(cinfo->wait, 716 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state)); 717 rv = lock_token(cinfo); 718 if (set_bit) 719 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); 720 return rv; 721} 722 723static void unlock_comm(struct md_cluster_info *cinfo) 724{ 725 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX); 726 mutex_unlock(&cinfo->recv_mutex); 727 dlm_unlock_sync(cinfo->token_lockres); 728 clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state); 729 wake_up(&cinfo->wait); 730} 731 732/* __sendmsg() 733 * This function performs the actual sending of the message. This function is 734 * usually called after performing the encompassing operation 735 * The function: 736 * 1. Grabs the message lockresource in EX mode 737 * 2. Copies the message to the message LVB 738 * 3. Downconverts message lockresource to CW 739 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes 740 * and the other nodes read the message. The thread will wait here until all other 741 * nodes have released ack lock resource. 742 * 5. Downconvert ack lockresource to CR 743 */ 744static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) 745{ 746 int error; 747 int slot = cinfo->slot_number - 1; 748 749 cmsg->slot = cpu_to_le32(slot); 750 /*get EX on Message*/ 751 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX); 752 if (error) { 753 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error); 754 goto failed_message; 755 } 756 757 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, 758 sizeof(struct cluster_msg)); 759 /*down-convert EX to CW on Message*/ 760 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW); 761 if (error) { 762 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n", 763 error); 764 goto failed_ack; 765 } 766 767 /*up-convert CR to EX on Ack*/ 768 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX); 769 if (error) { 770 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n", 771 error); 772 goto failed_ack; 773 } 774 775 /*down-convert EX to CR on Ack*/ 776 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR); 777 if (error) { 778 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n", 779 error); 780 goto failed_ack; 781 } 782 783failed_ack: 784 error = dlm_unlock_sync(cinfo->message_lockres); 785 if (unlikely(error != 0)) { 786 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n", 787 error); 788 /* in case the message can't be released due to some reason */ 789 goto failed_ack; 790 } 791failed_message: 792 return error; 793} 794 795static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg, 796 bool mddev_locked) 797{ 798 int ret; 799 800 ret = lock_comm(cinfo, mddev_locked); 801 if (!ret) { 802 ret = __sendmsg(cinfo, cmsg); 803 unlock_comm(cinfo); 804 } 805 return ret; 806} 807 808static int gather_all_resync_info(struct mddev *mddev, int total_slots) 809{ 810 struct md_cluster_info *cinfo = mddev->cluster_info; 811 int i, ret = 0; 812 struct dlm_lock_resource *bm_lockres; 813 char str[64]; 814 sector_t lo, hi; 815 816 817 for (i = 0; i < total_slots; i++) { 818 memset(str, '\0', 64); 819 snprintf(str, 64, "bitmap%04d", i); 820 bm_lockres = lockres_init(mddev, str, NULL, 1); 821 if (!bm_lockres) 822 return -ENOMEM; 823 if (i == (cinfo->slot_number - 1)) { 824 lockres_free(bm_lockres); 825 continue; 826 } 827 828 bm_lockres->flags |= DLM_LKF_NOQUEUE; 829 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); 830 if (ret == -EAGAIN) { 831 if (read_resync_info(mddev, bm_lockres)) { 832 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", 833 __func__, __LINE__, 834 (unsigned long long) cinfo->suspend_lo, 835 (unsigned long long) cinfo->suspend_hi, 836 i); 837 cinfo->suspend_from = i; 838 } 839 ret = 0; 840 lockres_free(bm_lockres); 841 continue; 842 } 843 if (ret) { 844 lockres_free(bm_lockres); 845 goto out; 846 } 847 848 /* Read the disk bitmap sb and check if it needs recovery */ 849 ret = md_bitmap_copy_from_slot(mddev, i, &lo, &hi, false); 850 if (ret) { 851 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i); 852 lockres_free(bm_lockres); 853 continue; 854 } 855 if ((hi > 0) && (lo < mddev->recovery_cp)) { 856 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 857 mddev->recovery_cp = lo; 858 md_check_recovery(mddev); 859 } 860 861 lockres_free(bm_lockres); 862 } 863out: 864 return ret; 865} 866 867static int join(struct mddev *mddev, int nodes) 868{ 869 struct md_cluster_info *cinfo; 870 int ret, ops_rv; 871 char str[64]; 872 873 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL); 874 if (!cinfo) 875 return -ENOMEM; 876 877 INIT_LIST_HEAD(&cinfo->suspend_list); 878 spin_lock_init(&cinfo->suspend_lock); 879 init_completion(&cinfo->completion); 880 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); 881 init_waitqueue_head(&cinfo->wait); 882 mutex_init(&cinfo->recv_mutex); 883 884 mddev->cluster_info = cinfo; 885 cinfo->mddev = mddev; 886 887 memset(str, 0, 64); 888 sprintf(str, "%pU", mddev->uuid); 889 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name, 890 0, LVB_SIZE, &md_ls_ops, mddev, 891 &ops_rv, &cinfo->lockspace); 892 if (ret) 893 goto err; 894 wait_for_completion(&cinfo->completion); 895 if (nodes < cinfo->slot_number) { 896 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).", 897 cinfo->slot_number, nodes); 898 ret = -ERANGE; 899 goto err; 900 } 901 /* Initiate the communication resources */ 902 ret = -ENOMEM; 903 rcu_assign_pointer(cinfo->recv_thread, 904 md_register_thread(recv_daemon, mddev, "cluster_recv")); 905 if (!cinfo->recv_thread) { 906 pr_err("md-cluster: cannot allocate memory for recv_thread!\n"); 907 goto err; 908 } 909 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1); 910 if (!cinfo->message_lockres) 911 goto err; 912 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0); 913 if (!cinfo->token_lockres) 914 goto err; 915 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0); 916 if (!cinfo->no_new_dev_lockres) 917 goto err; 918 919 ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); 920 if (ret) { 921 ret = -EAGAIN; 922 pr_err("md-cluster: can't join cluster to avoid lock issue\n"); 923 goto err; 924 } 925 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); 926 if (!cinfo->ack_lockres) { 927 ret = -ENOMEM; 928 goto err; 929 } 930 /* get sync CR lock on ACK. */ 931 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR)) 932 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n", 933 ret); 934 dlm_unlock_sync(cinfo->token_lockres); 935 /* get sync CR lock on no-new-dev. */ 936 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR)) 937 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret); 938 939 940 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number); 941 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1); 942 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1); 943 if (!cinfo->bitmap_lockres) { 944 ret = -ENOMEM; 945 goto err; 946 } 947 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { 948 pr_err("Failed to get bitmap lock\n"); 949 ret = -EINVAL; 950 goto err; 951 } 952 953 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0); 954 if (!cinfo->resync_lockres) { 955 ret = -ENOMEM; 956 goto err; 957 } 958 959 return 0; 960err: 961 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); 962 md_unregister_thread(mddev, &cinfo->recovery_thread); 963 md_unregister_thread(mddev, &cinfo->recv_thread); 964 lockres_free(cinfo->message_lockres); 965 lockres_free(cinfo->token_lockres); 966 lockres_free(cinfo->ack_lockres); 967 lockres_free(cinfo->no_new_dev_lockres); 968 lockres_free(cinfo->resync_lockres); 969 lockres_free(cinfo->bitmap_lockres); 970 if (cinfo->lockspace) 971 dlm_release_lockspace(cinfo->lockspace, 2); 972 mddev->cluster_info = NULL; 973 kfree(cinfo); 974 return ret; 975} 976 977static void load_bitmaps(struct mddev *mddev, int total_slots) 978{ 979 struct md_cluster_info *cinfo = mddev->cluster_info; 980 981 /* load all the node's bitmap info for resync */ 982 if (gather_all_resync_info(mddev, total_slots)) 983 pr_err("md-cluster: failed to gather all resyn infos\n"); 984 set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state); 985 /* wake up recv thread in case something need to be handled */ 986 if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state)) 987 md_wakeup_thread(cinfo->recv_thread); 988} 989 990static void resync_bitmap(struct mddev *mddev) 991{ 992 struct md_cluster_info *cinfo = mddev->cluster_info; 993 struct cluster_msg cmsg = {0}; 994 int err; 995 996 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC); 997 err = sendmsg(cinfo, &cmsg, 1); 998 if (err) 999 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n", 1000 __func__, __LINE__, err); 1001} 1002 1003static void unlock_all_bitmaps(struct mddev *mddev); 1004static int leave(struct mddev *mddev) 1005{ 1006 struct md_cluster_info *cinfo = mddev->cluster_info; 1007 1008 if (!cinfo) 1009 return 0; 1010 1011 /* 1012 * BITMAP_NEEDS_SYNC message should be sent when node 1013 * is leaving the cluster with dirty bitmap, also we 1014 * can only deliver it when dlm connection is available. 1015 * 1016 * Also, we should send BITMAP_NEEDS_SYNC message in 1017 * case reshaping is interrupted. 1018 */ 1019 if ((cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector) || 1020 (mddev->reshape_position != MaxSector && 1021 test_bit(MD_CLOSING, &mddev->flags))) 1022 resync_bitmap(mddev); 1023 1024 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); 1025 md_unregister_thread(mddev, &cinfo->recovery_thread); 1026 md_unregister_thread(mddev, &cinfo->recv_thread); 1027 lockres_free(cinfo->message_lockres); 1028 lockres_free(cinfo->token_lockres); 1029 lockres_free(cinfo->ack_lockres); 1030 lockres_free(cinfo->no_new_dev_lockres); 1031 lockres_free(cinfo->resync_lockres); 1032 lockres_free(cinfo->bitmap_lockres); 1033 unlock_all_bitmaps(mddev); 1034 dlm_release_lockspace(cinfo->lockspace, 2); 1035 kfree(cinfo); 1036 return 0; 1037} 1038 1039/* slot_number(): Returns the MD slot number to use 1040 * DLM starts the slot numbers from 1, wheras cluster-md 1041 * wants the number to be from zero, so we deduct one 1042 */ 1043static int slot_number(struct mddev *mddev) 1044{ 1045 struct md_cluster_info *cinfo = mddev->cluster_info; 1046 1047 return cinfo->slot_number - 1; 1048} 1049 1050/* 1051 * Check if the communication is already locked, else lock the communication 1052 * channel. 1053 * If it is already locked, token is in EX mode, and hence lock_token() 1054 * should not be called. 1055 */ 1056static int metadata_update_start(struct mddev *mddev) 1057{ 1058 struct md_cluster_info *cinfo = mddev->cluster_info; 1059 int ret; 1060 1061 /* 1062 * metadata_update_start is always called with the protection of 1063 * reconfig_mutex, so set WAITING_FOR_TOKEN here. 1064 */ 1065 ret = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, 1066 &cinfo->state); 1067 WARN_ON_ONCE(ret); 1068 md_wakeup_thread(mddev->thread); 1069 1070 wait_event(cinfo->wait, 1071 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) || 1072 test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state)); 1073 1074 /* If token is already locked, return 0 */ 1075 if (cinfo->token_lockres->mode == DLM_LOCK_EX) { 1076 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); 1077 return 0; 1078 } 1079 1080 ret = lock_token(cinfo); 1081 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); 1082 return ret; 1083} 1084 1085static int metadata_update_finish(struct mddev *mddev) 1086{ 1087 struct md_cluster_info *cinfo = mddev->cluster_info; 1088 struct cluster_msg cmsg; 1089 struct md_rdev *rdev; 1090 int ret = 0; 1091 int raid_slot = -1; 1092 1093 memset(&cmsg, 0, sizeof(cmsg)); 1094 cmsg.type = cpu_to_le32(METADATA_UPDATED); 1095 /* Pick up a good active device number to send. 1096 */ 1097 rdev_for_each(rdev, mddev) 1098 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) { 1099 raid_slot = rdev->desc_nr; 1100 break; 1101 } 1102 if (raid_slot >= 0) { 1103 cmsg.raid_slot = cpu_to_le32(raid_slot); 1104 ret = __sendmsg(cinfo, &cmsg); 1105 } else 1106 pr_warn("md-cluster: No good device id found to send\n"); 1107 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); 1108 unlock_comm(cinfo); 1109 return ret; 1110} 1111 1112static void metadata_update_cancel(struct mddev *mddev) 1113{ 1114 struct md_cluster_info *cinfo = mddev->cluster_info; 1115 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); 1116 unlock_comm(cinfo); 1117} 1118 1119static int update_bitmap_size(struct mddev *mddev, sector_t size) 1120{ 1121 struct md_cluster_info *cinfo = mddev->cluster_info; 1122 struct cluster_msg cmsg = {0}; 1123 int ret; 1124 1125 cmsg.type = cpu_to_le32(BITMAP_RESIZE); 1126 cmsg.high = cpu_to_le64(size); 1127 ret = sendmsg(cinfo, &cmsg, 0); 1128 if (ret) 1129 pr_err("%s:%d: failed to send BITMAP_RESIZE message (%d)\n", 1130 __func__, __LINE__, ret); 1131 return ret; 1132} 1133 1134static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize) 1135{ 1136 struct bitmap_counts *counts; 1137 char str[64]; 1138 struct dlm_lock_resource *bm_lockres; 1139 struct bitmap *bitmap = mddev->bitmap; 1140 unsigned long my_pages = bitmap->counts.pages; 1141 int i, rv; 1142 1143 /* 1144 * We need to ensure all the nodes can grow to a larger 1145 * bitmap size before make the reshaping. 1146 */ 1147 rv = update_bitmap_size(mddev, newsize); 1148 if (rv) 1149 return rv; 1150 1151 for (i = 0; i < mddev->bitmap_info.nodes; i++) { 1152 if (i == md_cluster_ops->slot_number(mddev)) 1153 continue; 1154 1155 bitmap = get_bitmap_from_slot(mddev, i); 1156 if (IS_ERR(bitmap)) { 1157 pr_err("can't get bitmap from slot %d\n", i); 1158 bitmap = NULL; 1159 goto out; 1160 } 1161 counts = &bitmap->counts; 1162 1163 /* 1164 * If we can hold the bitmap lock of one node then 1165 * the slot is not occupied, update the pages. 1166 */ 1167 snprintf(str, 64, "bitmap%04d", i); 1168 bm_lockres = lockres_init(mddev, str, NULL, 1); 1169 if (!bm_lockres) { 1170 pr_err("Cannot initialize %s lock\n", str); 1171 goto out; 1172 } 1173 bm_lockres->flags |= DLM_LKF_NOQUEUE; 1174 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); 1175 if (!rv) 1176 counts->pages = my_pages; 1177 lockres_free(bm_lockres); 1178 1179 if (my_pages != counts->pages) 1180 /* 1181 * Let's revert the bitmap size if one node 1182 * can't resize bitmap 1183 */ 1184 goto out; 1185 md_bitmap_free(bitmap); 1186 } 1187 1188 return 0; 1189out: 1190 md_bitmap_free(bitmap); 1191 update_bitmap_size(mddev, oldsize); 1192 return -1; 1193} 1194 1195/* 1196 * return 0 if all the bitmaps have the same sync_size 1197 */ 1198static int cluster_check_sync_size(struct mddev *mddev) 1199{ 1200 int i, rv; 1201 bitmap_super_t *sb; 1202 unsigned long my_sync_size, sync_size = 0; 1203 int node_num = mddev->bitmap_info.nodes; 1204 int current_slot = md_cluster_ops->slot_number(mddev); 1205 struct bitmap *bitmap = mddev->bitmap; 1206 char str[64]; 1207 struct dlm_lock_resource *bm_lockres; 1208 1209 sb = kmap_atomic(bitmap->storage.sb_page); 1210 my_sync_size = sb->sync_size; 1211 kunmap_atomic(sb); 1212 1213 for (i = 0; i < node_num; i++) { 1214 if (i == current_slot) 1215 continue; 1216 1217 bitmap = get_bitmap_from_slot(mddev, i); 1218 if (IS_ERR(bitmap)) { 1219 pr_err("can't get bitmap from slot %d\n", i); 1220 return -1; 1221 } 1222 1223 /* 1224 * If we can hold the bitmap lock of one node then 1225 * the slot is not occupied, update the sb. 1226 */ 1227 snprintf(str, 64, "bitmap%04d", i); 1228 bm_lockres = lockres_init(mddev, str, NULL, 1); 1229 if (!bm_lockres) { 1230 pr_err("md-cluster: Cannot initialize %s\n", str); 1231 md_bitmap_free(bitmap); 1232 return -1; 1233 } 1234 bm_lockres->flags |= DLM_LKF_NOQUEUE; 1235 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); 1236 if (!rv) 1237 md_bitmap_update_sb(bitmap); 1238 lockres_free(bm_lockres); 1239 1240 sb = kmap_atomic(bitmap->storage.sb_page); 1241 if (sync_size == 0) 1242 sync_size = sb->sync_size; 1243 else if (sync_size != sb->sync_size) { 1244 kunmap_atomic(sb); 1245 md_bitmap_free(bitmap); 1246 return -1; 1247 } 1248 kunmap_atomic(sb); 1249 md_bitmap_free(bitmap); 1250 } 1251 1252 return (my_sync_size == sync_size) ? 0 : -1; 1253} 1254 1255/* 1256 * Update the size for cluster raid is a little more complex, we perform it 1257 * by the steps: 1258 * 1. hold token lock and update superblock in initiator node. 1259 * 2. send METADATA_UPDATED msg to other nodes. 1260 * 3. The initiator node continues to check each bitmap's sync_size, if all 1261 * bitmaps have the same value of sync_size, then we can set capacity and 1262 * let other nodes to perform it. If one node can't update sync_size 1263 * accordingly, we need to revert to previous value. 1264 */ 1265static void update_size(struct mddev *mddev, sector_t old_dev_sectors) 1266{ 1267 struct md_cluster_info *cinfo = mddev->cluster_info; 1268 struct cluster_msg cmsg; 1269 struct md_rdev *rdev; 1270 int ret = 0; 1271 int raid_slot = -1; 1272 1273 md_update_sb(mddev, 1); 1274 if (lock_comm(cinfo, 1)) { 1275 pr_err("%s: lock_comm failed\n", __func__); 1276 return; 1277 } 1278 1279 memset(&cmsg, 0, sizeof(cmsg)); 1280 cmsg.type = cpu_to_le32(METADATA_UPDATED); 1281 rdev_for_each(rdev, mddev) 1282 if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) { 1283 raid_slot = rdev->desc_nr; 1284 break; 1285 } 1286 if (raid_slot >= 0) { 1287 cmsg.raid_slot = cpu_to_le32(raid_slot); 1288 /* 1289 * We can only change capiticy after all the nodes can do it, 1290 * so need to wait after other nodes already received the msg 1291 * and handled the change 1292 */ 1293 ret = __sendmsg(cinfo, &cmsg); 1294 if (ret) { 1295 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n", 1296 __func__, __LINE__); 1297 unlock_comm(cinfo); 1298 return; 1299 } 1300 } else { 1301 pr_err("md-cluster: No good device id found to send\n"); 1302 unlock_comm(cinfo); 1303 return; 1304 } 1305 1306 /* 1307 * check the sync_size from other node's bitmap, if sync_size 1308 * have already updated in other nodes as expected, send an 1309 * empty metadata msg to permit the change of capacity 1310 */ 1311 if (cluster_check_sync_size(mddev) == 0) { 1312 memset(&cmsg, 0, sizeof(cmsg)); 1313 cmsg.type = cpu_to_le32(CHANGE_CAPACITY); 1314 ret = __sendmsg(cinfo, &cmsg); 1315 if (ret) 1316 pr_err("%s:%d: failed to send CHANGE_CAPACITY msg\n", 1317 __func__, __LINE__); 1318 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors); 1319 } else { 1320 /* revert to previous sectors */ 1321 ret = mddev->pers->resize(mddev, old_dev_sectors); 1322 ret = __sendmsg(cinfo, &cmsg); 1323 if (ret) 1324 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n", 1325 __func__, __LINE__); 1326 } 1327 unlock_comm(cinfo); 1328} 1329 1330static int resync_start(struct mddev *mddev) 1331{ 1332 struct md_cluster_info *cinfo = mddev->cluster_info; 1333 return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev); 1334} 1335 1336static void resync_info_get(struct mddev *mddev, sector_t *lo, sector_t *hi) 1337{ 1338 struct md_cluster_info *cinfo = mddev->cluster_info; 1339 1340 spin_lock_irq(&cinfo->suspend_lock); 1341 *lo = cinfo->suspend_lo; 1342 *hi = cinfo->suspend_hi; 1343 spin_unlock_irq(&cinfo->suspend_lock); 1344} 1345 1346static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) 1347{ 1348 struct md_cluster_info *cinfo = mddev->cluster_info; 1349 struct resync_info ri; 1350 struct cluster_msg cmsg = {0}; 1351 1352 /* do not send zero again, if we have sent before */ 1353 if (hi == 0) { 1354 memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); 1355 if (le64_to_cpu(ri.hi) == 0) 1356 return 0; 1357 } 1358 1359 add_resync_info(cinfo->bitmap_lockres, lo, hi); 1360 /* Re-acquire the lock to refresh LVB */ 1361 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); 1362 cmsg.type = cpu_to_le32(RESYNCING); 1363 cmsg.low = cpu_to_le64(lo); 1364 cmsg.high = cpu_to_le64(hi); 1365 1366 /* 1367 * mddev_lock is held if resync_info_update is called from 1368 * resync_finish (md_reap_sync_thread -> resync_finish) 1369 */ 1370 if (lo == 0 && hi == 0) 1371 return sendmsg(cinfo, &cmsg, 1); 1372 else 1373 return sendmsg(cinfo, &cmsg, 0); 1374} 1375 1376static int resync_finish(struct mddev *mddev) 1377{ 1378 struct md_cluster_info *cinfo = mddev->cluster_info; 1379 int ret = 0; 1380 1381 clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery); 1382 1383 /* 1384 * If resync thread is interrupted so we can't say resync is finished, 1385 * another node will launch resync thread to continue. 1386 */ 1387 if (!test_bit(MD_CLOSING, &mddev->flags)) 1388 ret = resync_info_update(mddev, 0, 0); 1389 dlm_unlock_sync(cinfo->resync_lockres); 1390 return ret; 1391} 1392 1393static int area_resyncing(struct mddev *mddev, int direction, 1394 sector_t lo, sector_t hi) 1395{ 1396 struct md_cluster_info *cinfo = mddev->cluster_info; 1397 int ret = 0; 1398 1399 if ((direction == READ) && 1400 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state)) 1401 return 1; 1402 1403 spin_lock_irq(&cinfo->suspend_lock); 1404 if (hi > cinfo->suspend_lo && lo < cinfo->suspend_hi) 1405 ret = 1; 1406 spin_unlock_irq(&cinfo->suspend_lock); 1407 return ret; 1408} 1409 1410/* add_new_disk() - initiates a disk add 1411 * However, if this fails before writing md_update_sb(), 1412 * add_new_disk_cancel() must be called to release token lock 1413 */ 1414static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev) 1415{ 1416 struct md_cluster_info *cinfo = mddev->cluster_info; 1417 struct cluster_msg cmsg; 1418 int ret = 0; 1419 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 1420 char *uuid = sb->device_uuid; 1421 1422 memset(&cmsg, 0, sizeof(cmsg)); 1423 cmsg.type = cpu_to_le32(NEWDISK); 1424 memcpy(cmsg.uuid, uuid, 16); 1425 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); 1426 if (lock_comm(cinfo, 1)) 1427 return -EAGAIN; 1428 ret = __sendmsg(cinfo, &cmsg); 1429 if (ret) { 1430 unlock_comm(cinfo); 1431 return ret; 1432 } 1433 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE; 1434 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX); 1435 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE; 1436 /* Some node does not "see" the device */ 1437 if (ret == -EAGAIN) 1438 ret = -ENOENT; 1439 if (ret) 1440 unlock_comm(cinfo); 1441 else { 1442 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); 1443 /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which 1444 * will run soon after add_new_disk, the below path will be 1445 * invoked: 1446 * md_wakeup_thread(mddev->thread) 1447 * -> conf->thread (raid1d) 1448 * -> md_check_recovery -> md_update_sb 1449 * -> metadata_update_start/finish 1450 * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually. 1451 * 1452 * For other failure cases, metadata_update_cancel and 1453 * add_new_disk_cancel also clear below bit as well. 1454 * */ 1455 set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); 1456 wake_up(&cinfo->wait); 1457 } 1458 return ret; 1459} 1460 1461static void add_new_disk_cancel(struct mddev *mddev) 1462{ 1463 struct md_cluster_info *cinfo = mddev->cluster_info; 1464 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); 1465 unlock_comm(cinfo); 1466} 1467 1468static int new_disk_ack(struct mddev *mddev, bool ack) 1469{ 1470 struct md_cluster_info *cinfo = mddev->cluster_info; 1471 1472 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) { 1473 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev)); 1474 return -EINVAL; 1475 } 1476 1477 if (ack) 1478 dlm_unlock_sync(cinfo->no_new_dev_lockres); 1479 complete(&cinfo->newdisk_completion); 1480 return 0; 1481} 1482 1483static int remove_disk(struct mddev *mddev, struct md_rdev *rdev) 1484{ 1485 struct cluster_msg cmsg = {0}; 1486 struct md_cluster_info *cinfo = mddev->cluster_info; 1487 cmsg.type = cpu_to_le32(REMOVE); 1488 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); 1489 return sendmsg(cinfo, &cmsg, 1); 1490} 1491 1492static int lock_all_bitmaps(struct mddev *mddev) 1493{ 1494 int slot, my_slot, ret, held = 1, i = 0; 1495 char str[64]; 1496 struct md_cluster_info *cinfo = mddev->cluster_info; 1497 1498 cinfo->other_bitmap_lockres = 1499 kcalloc(mddev->bitmap_info.nodes - 1, 1500 sizeof(struct dlm_lock_resource *), GFP_KERNEL); 1501 if (!cinfo->other_bitmap_lockres) { 1502 pr_err("md: can't alloc mem for other bitmap locks\n"); 1503 return 0; 1504 } 1505 1506 my_slot = slot_number(mddev); 1507 for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) { 1508 if (slot == my_slot) 1509 continue; 1510 1511 memset(str, '\0', 64); 1512 snprintf(str, 64, "bitmap%04d", slot); 1513 cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1); 1514 if (!cinfo->other_bitmap_lockres[i]) 1515 return -ENOMEM; 1516 1517 cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE; 1518 ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW); 1519 if (ret) 1520 held = -1; 1521 i++; 1522 } 1523 1524 return held; 1525} 1526 1527static void unlock_all_bitmaps(struct mddev *mddev) 1528{ 1529 struct md_cluster_info *cinfo = mddev->cluster_info; 1530 int i; 1531 1532 /* release other node's bitmap lock if they are existed */ 1533 if (cinfo->other_bitmap_lockres) { 1534 for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) { 1535 if (cinfo->other_bitmap_lockres[i]) { 1536 lockres_free(cinfo->other_bitmap_lockres[i]); 1537 } 1538 } 1539 kfree(cinfo->other_bitmap_lockres); 1540 cinfo->other_bitmap_lockres = NULL; 1541 } 1542} 1543 1544static int gather_bitmaps(struct md_rdev *rdev) 1545{ 1546 int sn, err; 1547 sector_t lo, hi; 1548 struct cluster_msg cmsg = {0}; 1549 struct mddev *mddev = rdev->mddev; 1550 struct md_cluster_info *cinfo = mddev->cluster_info; 1551 1552 cmsg.type = cpu_to_le32(RE_ADD); 1553 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); 1554 err = sendmsg(cinfo, &cmsg, 1); 1555 if (err) 1556 goto out; 1557 1558 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) { 1559 if (sn == (cinfo->slot_number - 1)) 1560 continue; 1561 err = md_bitmap_copy_from_slot(mddev, sn, &lo, &hi, false); 1562 if (err) { 1563 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn); 1564 goto out; 1565 } 1566 if ((hi > 0) && (lo < mddev->recovery_cp)) 1567 mddev->recovery_cp = lo; 1568 } 1569out: 1570 return err; 1571} 1572 1573static struct md_cluster_operations cluster_ops = { 1574 .join = join, 1575 .leave = leave, 1576 .slot_number = slot_number, 1577 .resync_start = resync_start, 1578 .resync_finish = resync_finish, 1579 .resync_info_update = resync_info_update, 1580 .resync_info_get = resync_info_get, 1581 .metadata_update_start = metadata_update_start, 1582 .metadata_update_finish = metadata_update_finish, 1583 .metadata_update_cancel = metadata_update_cancel, 1584 .area_resyncing = area_resyncing, 1585 .add_new_disk = add_new_disk, 1586 .add_new_disk_cancel = add_new_disk_cancel, 1587 .new_disk_ack = new_disk_ack, 1588 .remove_disk = remove_disk, 1589 .load_bitmaps = load_bitmaps, 1590 .gather_bitmaps = gather_bitmaps, 1591 .resize_bitmaps = resize_bitmaps, 1592 .lock_all_bitmaps = lock_all_bitmaps, 1593 .unlock_all_bitmaps = unlock_all_bitmaps, 1594 .update_size = update_size, 1595}; 1596 1597static int __init cluster_init(void) 1598{ 1599 pr_warn("md-cluster: support raid1 and raid10 (limited support)\n"); 1600 pr_info("Registering Cluster MD functions\n"); 1601 register_md_cluster_operations(&cluster_ops, THIS_MODULE); 1602 return 0; 1603} 1604 1605static void cluster_exit(void) 1606{ 1607 unregister_md_cluster_operations(); 1608} 1609 1610module_init(cluster_init); 1611module_exit(cluster_exit); 1612MODULE_AUTHOR("SUSE"); 1613MODULE_LICENSE("GPL"); 1614MODULE_DESCRIPTION("Clustering support for MD"); 1615