1/* 2 * Copyright (C) 2015, SUSE 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2, or (at your option) 7 * any later version. 8 * 9 */ 10 11 12#include <linux/module.h> 13#include <linux/dlm.h> 14#include <linux/sched.h> 15#include <linux/raid/md_p.h> 16#include "md.h" 17#include "bitmap.h" 18#include "md-cluster.h" 19 20#define LVB_SIZE 64 21#define NEW_DEV_TIMEOUT 5000 22 23struct dlm_lock_resource { 24 dlm_lockspace_t *ls; 25 struct dlm_lksb lksb; 26 char *name; /* lock name. */ 27 uint32_t flags; /* flags to pass to dlm_lock() */ 28 struct completion completion; /* completion for synchronized locking */ 29 void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ 30 struct mddev *mddev; /* pointing back to mddev. */ 31}; 32 33struct suspend_info { 34 int slot; 35 sector_t lo; 36 sector_t hi; 37 struct list_head list; 38}; 39 40struct resync_info { 41 __le64 lo; 42 __le64 hi; 43}; 44 45/* md_cluster_info flags */ 46#define MD_CLUSTER_WAITING_FOR_NEWDISK 1 47 48 49struct md_cluster_info { 50 /* dlm lock space and resources for clustered raid. */ 51 dlm_lockspace_t *lockspace; 52 int slot_number; 53 struct completion completion; 54 struct dlm_lock_resource *sb_lock; 55 struct mutex sb_mutex; 56 struct dlm_lock_resource *bitmap_lockres; 57 struct list_head suspend_list; 58 spinlock_t suspend_lock; 59 struct md_thread *recovery_thread; 60 unsigned long recovery_map; 61 /* communication loc resources */ 62 struct dlm_lock_resource *ack_lockres; 63 struct dlm_lock_resource *message_lockres; 64 struct dlm_lock_resource *token_lockres; 65 struct dlm_lock_resource *no_new_dev_lockres; 66 struct md_thread *recv_thread; 67 struct completion newdisk_completion; 68 unsigned long state; 69}; 70 71enum msg_type { 72 METADATA_UPDATED = 0, 73 RESYNCING, 74 NEWDISK, 75 REMOVE, 76 RE_ADD, 77}; 78 79struct cluster_msg { 80 int type; 81 int slot; 82 /* TODO: Unionize this for smaller footprint */ 83 sector_t low; 84 sector_t high; 85 char uuid[16]; 86 int raid_slot; 87}; 88 89static void sync_ast(void *arg) 90{ 91 struct dlm_lock_resource *res; 92 93 res = (struct dlm_lock_resource *) arg; 94 complete(&res->completion); 95} 96 97static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) 98{ 99 int ret = 0; 100 101 init_completion(&res->completion); 102 ret = dlm_lock(res->ls, mode, &res->lksb, 103 res->flags, res->name, strlen(res->name), 104 0, sync_ast, res, res->bast); 105 if (ret) 106 return ret; 107 wait_for_completion(&res->completion); 108 return res->lksb.sb_status; 109} 110 111static int dlm_unlock_sync(struct dlm_lock_resource *res) 112{ 113 return dlm_lock_sync(res, DLM_LOCK_NL); 114} 115 116static struct dlm_lock_resource *lockres_init(struct mddev *mddev, 117 char *name, void (*bastfn)(void *arg, int mode), int with_lvb) 118{ 119 struct dlm_lock_resource *res = NULL; 120 int ret, namelen; 121 struct md_cluster_info *cinfo = mddev->cluster_info; 122 123 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); 124 if (!res) 125 return NULL; 126 res->ls = cinfo->lockspace; 127 res->mddev = mddev; 128 namelen = strlen(name); 129 res->name = kzalloc(namelen + 1, GFP_KERNEL); 130 if (!res->name) { 131 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); 132 goto out_err; 133 } 134 strlcpy(res->name, name, namelen + 1); 135 if (with_lvb) { 136 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL); 137 if (!res->lksb.sb_lvbptr) { 138 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name); 139 goto out_err; 140 } 141 res->flags = DLM_LKF_VALBLK; 142 } 143 144 if (bastfn) 145 res->bast = bastfn; 146 147 res->flags |= DLM_LKF_EXPEDITE; 148 149 ret = dlm_lock_sync(res, DLM_LOCK_NL); 150 if (ret) { 151 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name); 152 goto out_err; 153 } 154 res->flags &= ~DLM_LKF_EXPEDITE; 155 res->flags |= DLM_LKF_CONVERT; 156 157 return res; 158out_err: 159 kfree(res->lksb.sb_lvbptr); 160 kfree(res->name); 161 kfree(res); 162 return NULL; 163} 164 165static void lockres_free(struct dlm_lock_resource *res) 166{ 167 if (!res) 168 return; 169 170 init_completion(&res->completion); 171 dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res); 172 wait_for_completion(&res->completion); 173 174 kfree(res->name); 175 kfree(res->lksb.sb_lvbptr); 176 kfree(res); 177} 178 179static char *pretty_uuid(char *dest, char *src) 180{ 181 int i, len = 0; 182 183 for (i = 0; i < 16; i++) { 184 if (i == 4 || i == 6 || i == 8 || i == 10) 185 len += sprintf(dest + len, "-"); 186 len += sprintf(dest + len, "%02x", (__u8)src[i]); 187 } 188 return dest; 189} 190 191static void add_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres, 192 sector_t lo, sector_t hi) 193{ 194 struct resync_info *ri; 195 196 ri = (struct resync_info *)lockres->lksb.sb_lvbptr; 197 ri->lo = cpu_to_le64(lo); 198 ri->hi = cpu_to_le64(hi); 199} 200 201static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres) 202{ 203 struct resync_info ri; 204 struct suspend_info *s = NULL; 205 sector_t hi = 0; 206 207 dlm_lock_sync(lockres, DLM_LOCK_CR); 208 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); 209 hi = le64_to_cpu(ri.hi); 210 if (ri.hi > 0) { 211 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); 212 if (!s) 213 goto out; 214 s->hi = hi; 215 s->lo = le64_to_cpu(ri.lo); 216 } 217 dlm_unlock_sync(lockres); 218out: 219 return s; 220} 221 222static void recover_bitmaps(struct md_thread *thread) 223{ 224 struct mddev *mddev = thread->mddev; 225 struct md_cluster_info *cinfo = mddev->cluster_info; 226 struct dlm_lock_resource *bm_lockres; 227 char str[64]; 228 int slot, ret; 229 struct suspend_info *s, *tmp; 230 sector_t lo, hi; 231 232 while (cinfo->recovery_map) { 233 slot = fls64((u64)cinfo->recovery_map) - 1; 234 235 /* Clear suspend_area associated with the bitmap */ 236 spin_lock_irq(&cinfo->suspend_lock); 237 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) 238 if (slot == s->slot) { 239 list_del(&s->list); 240 kfree(s); 241 } 242 spin_unlock_irq(&cinfo->suspend_lock); 243 244 snprintf(str, 64, "bitmap%04d", slot); 245 bm_lockres = lockres_init(mddev, str, NULL, 1); 246 if (!bm_lockres) { 247 pr_err("md-cluster: Cannot initialize bitmaps\n"); 248 goto clear_bit; 249 } 250 251 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); 252 if (ret) { 253 pr_err("md-cluster: Could not DLM lock %s: %d\n", 254 str, ret); 255 goto clear_bit; 256 } 257 ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true); 258 if (ret) { 259 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot); 260 goto dlm_unlock; 261 } 262 if (hi > 0) { 263 /* TODO:Wait for current resync to get over */ 264 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 265 if (lo < mddev->recovery_cp) 266 mddev->recovery_cp = lo; 267 md_check_recovery(mddev); 268 } 269dlm_unlock: 270 dlm_unlock_sync(bm_lockres); 271clear_bit: 272 clear_bit(slot, &cinfo->recovery_map); 273 } 274} 275 276static void recover_prep(void *arg) 277{ 278} 279 280static void recover_slot(void *arg, struct dlm_slot *slot) 281{ 282 struct mddev *mddev = arg; 283 struct md_cluster_info *cinfo = mddev->cluster_info; 284 285 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", 286 mddev->bitmap_info.cluster_name, 287 slot->nodeid, slot->slot, 288 cinfo->slot_number); 289 set_bit(slot->slot - 1, &cinfo->recovery_map); 290 if (!cinfo->recovery_thread) { 291 cinfo->recovery_thread = md_register_thread(recover_bitmaps, 292 mddev, "recover"); 293 if (!cinfo->recovery_thread) { 294 pr_warn("md-cluster: Could not create recovery thread\n"); 295 return; 296 } 297 } 298 md_wakeup_thread(cinfo->recovery_thread); 299} 300 301static void recover_done(void *arg, struct dlm_slot *slots, 302 int num_slots, int our_slot, 303 uint32_t generation) 304{ 305 struct mddev *mddev = arg; 306 struct md_cluster_info *cinfo = mddev->cluster_info; 307 308 cinfo->slot_number = our_slot; 309 complete(&cinfo->completion); 310} 311 312static const struct dlm_lockspace_ops md_ls_ops = { 313 .recover_prep = recover_prep, 314 .recover_slot = recover_slot, 315 .recover_done = recover_done, 316}; 317 318/* 319 * The BAST function for the ack lock resource 320 * This function wakes up the receive thread in 321 * order to receive and process the message. 322 */ 323static void ack_bast(void *arg, int mode) 324{ 325 struct dlm_lock_resource *res = (struct dlm_lock_resource *)arg; 326 struct md_cluster_info *cinfo = res->mddev->cluster_info; 327 328 if (mode == DLM_LOCK_EX) 329 md_wakeup_thread(cinfo->recv_thread); 330} 331 332static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot) 333{ 334 struct suspend_info *s, *tmp; 335 336 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) 337 if (slot == s->slot) { 338 pr_info("%s:%d Deleting suspend_info: %d\n", 339 __func__, __LINE__, slot); 340 list_del(&s->list); 341 kfree(s); 342 break; 343 } 344} 345 346static void remove_suspend_info(struct md_cluster_info *cinfo, int slot) 347{ 348 spin_lock_irq(&cinfo->suspend_lock); 349 __remove_suspend_info(cinfo, slot); 350 spin_unlock_irq(&cinfo->suspend_lock); 351} 352 353 354static void process_suspend_info(struct md_cluster_info *cinfo, 355 int slot, sector_t lo, sector_t hi) 356{ 357 struct suspend_info *s; 358 359 if (!hi) { 360 remove_suspend_info(cinfo, slot); 361 return; 362 } 363 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); 364 if (!s) 365 return; 366 s->slot = slot; 367 s->lo = lo; 368 s->hi = hi; 369 spin_lock_irq(&cinfo->suspend_lock); 370 /* Remove existing entry (if exists) before adding */ 371 __remove_suspend_info(cinfo, slot); 372 list_add(&s->list, &cinfo->suspend_list); 373 spin_unlock_irq(&cinfo->suspend_lock); 374} 375 376static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg) 377{ 378 char disk_uuid[64]; 379 struct md_cluster_info *cinfo = mddev->cluster_info; 380 char event_name[] = "EVENT=ADD_DEVICE"; 381 char raid_slot[16]; 382 char *envp[] = {event_name, disk_uuid, raid_slot, NULL}; 383 int len; 384 385 len = snprintf(disk_uuid, 64, "DEVICE_UUID="); 386 pretty_uuid(disk_uuid + len, cmsg->uuid); 387 snprintf(raid_slot, 16, "RAID_DISK=%d", cmsg->raid_slot); 388 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot); 389 init_completion(&cinfo->newdisk_completion); 390 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); 391 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp); 392 wait_for_completion_timeout(&cinfo->newdisk_completion, 393 NEW_DEV_TIMEOUT); 394 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); 395} 396 397 398static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg) 399{ 400 struct md_cluster_info *cinfo = mddev->cluster_info; 401 402 md_reload_sb(mddev); 403 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); 404} 405 406static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg) 407{ 408 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot); 409 410 if (rdev) 411 md_kick_rdev_from_array(rdev); 412 else 413 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", __func__, __LINE__, msg->raid_slot); 414} 415 416static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg) 417{ 418 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot); 419 420 if (rdev && test_bit(Faulty, &rdev->flags)) 421 clear_bit(Faulty, &rdev->flags); 422 else 423 pr_warn("%s: %d Could not find disk(%d) which is faulty", __func__, __LINE__, msg->raid_slot); 424} 425 426static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) 427{ 428 switch (msg->type) { 429 case METADATA_UPDATED: 430 pr_info("%s: %d Received message: METADATA_UPDATE from %d\n", 431 __func__, __LINE__, msg->slot); 432 process_metadata_update(mddev, msg); 433 break; 434 case RESYNCING: 435 pr_info("%s: %d Received message: RESYNCING from %d\n", 436 __func__, __LINE__, msg->slot); 437 process_suspend_info(mddev->cluster_info, msg->slot, 438 msg->low, msg->high); 439 break; 440 case NEWDISK: 441 pr_info("%s: %d Received message: NEWDISK from %d\n", 442 __func__, __LINE__, msg->slot); 443 process_add_new_disk(mddev, msg); 444 break; 445 case REMOVE: 446 pr_info("%s: %d Received REMOVE from %d\n", 447 __func__, __LINE__, msg->slot); 448 process_remove_disk(mddev, msg); 449 break; 450 case RE_ADD: 451 pr_info("%s: %d Received RE_ADD from %d\n", 452 __func__, __LINE__, msg->slot); 453 process_readd_disk(mddev, msg); 454 break; 455 default: 456 pr_warn("%s:%d Received unknown message from %d\n", 457 __func__, __LINE__, msg->slot); 458 } 459} 460 461/* 462 * thread for receiving message 463 */ 464static void recv_daemon(struct md_thread *thread) 465{ 466 struct md_cluster_info *cinfo = thread->mddev->cluster_info; 467 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres; 468 struct dlm_lock_resource *message_lockres = cinfo->message_lockres; 469 struct cluster_msg msg; 470 471 /*get CR on Message*/ 472 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { 473 pr_err("md/raid1:failed to get CR on MESSAGE\n"); 474 return; 475 } 476 477 /* read lvb and wake up thread to process this message_lockres */ 478 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); 479 process_recvd_msg(thread->mddev, &msg); 480 481 /*release CR on ack_lockres*/ 482 dlm_unlock_sync(ack_lockres); 483 /*up-convert to EX on message_lockres*/ 484 dlm_lock_sync(message_lockres, DLM_LOCK_EX); 485 /*get CR on ack_lockres again*/ 486 dlm_lock_sync(ack_lockres, DLM_LOCK_CR); 487 /*release CR on message_lockres*/ 488 dlm_unlock_sync(message_lockres); 489} 490 491/* lock_comm() 492 * Takes the lock on the TOKEN lock resource so no other 493 * node can communicate while the operation is underway. 494 */ 495static int lock_comm(struct md_cluster_info *cinfo) 496{ 497 int error; 498 499 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); 500 if (error) 501 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n", 502 __func__, __LINE__, error); 503 return error; 504} 505 506static void unlock_comm(struct md_cluster_info *cinfo) 507{ 508 dlm_unlock_sync(cinfo->token_lockres); 509} 510 511/* __sendmsg() 512 * This function performs the actual sending of the message. This function is 513 * usually called after performing the encompassing operation 514 * The function: 515 * 1. Grabs the message lockresource in EX mode 516 * 2. Copies the message to the message LVB 517 * 3. Downconverts message lockresource to CR 518 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes 519 * and the other nodes read the message. The thread will wait here until all other 520 * nodes have released ack lock resource. 521 * 5. Downconvert ack lockresource to CR 522 */ 523static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) 524{ 525 int error; 526 int slot = cinfo->slot_number - 1; 527 528 cmsg->slot = cpu_to_le32(slot); 529 /*get EX on Message*/ 530 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX); 531 if (error) { 532 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error); 533 goto failed_message; 534 } 535 536 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, 537 sizeof(struct cluster_msg)); 538 /*down-convert EX to CR on Message*/ 539 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CR); 540 if (error) { 541 pr_err("md-cluster: failed to convert EX to CR on MESSAGE(%d)\n", 542 error); 543 goto failed_message; 544 } 545 546 /*up-convert CR to EX on Ack*/ 547 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX); 548 if (error) { 549 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n", 550 error); 551 goto failed_ack; 552 } 553 554 /*down-convert EX to CR on Ack*/ 555 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR); 556 if (error) { 557 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n", 558 error); 559 goto failed_ack; 560 } 561 562failed_ack: 563 dlm_unlock_sync(cinfo->message_lockres); 564failed_message: 565 return error; 566} 567 568static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) 569{ 570 int ret; 571 572 lock_comm(cinfo); 573 ret = __sendmsg(cinfo, cmsg); 574 unlock_comm(cinfo); 575 return ret; 576} 577 578static int gather_all_resync_info(struct mddev *mddev, int total_slots) 579{ 580 struct md_cluster_info *cinfo = mddev->cluster_info; 581 int i, ret = 0; 582 struct dlm_lock_resource *bm_lockres; 583 struct suspend_info *s; 584 char str[64]; 585 586 587 for (i = 0; i < total_slots; i++) { 588 memset(str, '\0', 64); 589 snprintf(str, 64, "bitmap%04d", i); 590 bm_lockres = lockres_init(mddev, str, NULL, 1); 591 if (!bm_lockres) 592 return -ENOMEM; 593 if (i == (cinfo->slot_number - 1)) 594 continue; 595 596 bm_lockres->flags |= DLM_LKF_NOQUEUE; 597 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); 598 if (ret == -EAGAIN) { 599 memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE); 600 s = read_resync_info(mddev, bm_lockres); 601 if (s) { 602 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", 603 __func__, __LINE__, 604 (unsigned long long) s->lo, 605 (unsigned long long) s->hi, i); 606 spin_lock_irq(&cinfo->suspend_lock); 607 s->slot = i; 608 list_add(&s->list, &cinfo->suspend_list); 609 spin_unlock_irq(&cinfo->suspend_lock); 610 } 611 ret = 0; 612 lockres_free(bm_lockres); 613 continue; 614 } 615 if (ret) 616 goto out; 617 /* TODO: Read the disk bitmap sb and check if it needs recovery */ 618 dlm_unlock_sync(bm_lockres); 619 lockres_free(bm_lockres); 620 } 621out: 622 return ret; 623} 624 625static int join(struct mddev *mddev, int nodes) 626{ 627 struct md_cluster_info *cinfo; 628 int ret, ops_rv; 629 char str[64]; 630 631 if (!try_module_get(THIS_MODULE)) 632 return -ENOENT; 633 634 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL); 635 if (!cinfo) 636 return -ENOMEM; 637 638 init_completion(&cinfo->completion); 639 640 mutex_init(&cinfo->sb_mutex); 641 mddev->cluster_info = cinfo; 642 643 memset(str, 0, 64); 644 pretty_uuid(str, mddev->uuid); 645 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name, 646 DLM_LSFL_FS, LVB_SIZE, 647 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace); 648 if (ret) 649 goto err; 650 wait_for_completion(&cinfo->completion); 651 if (nodes < cinfo->slot_number) { 652 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).", 653 cinfo->slot_number, nodes); 654 ret = -ERANGE; 655 goto err; 656 } 657 cinfo->sb_lock = lockres_init(mddev, "cmd-super", 658 NULL, 0); 659 if (!cinfo->sb_lock) { 660 ret = -ENOMEM; 661 goto err; 662 } 663 /* Initiate the communication resources */ 664 ret = -ENOMEM; 665 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv"); 666 if (!cinfo->recv_thread) { 667 pr_err("md-cluster: cannot allocate memory for recv_thread!\n"); 668 goto err; 669 } 670 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1); 671 if (!cinfo->message_lockres) 672 goto err; 673 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0); 674 if (!cinfo->token_lockres) 675 goto err; 676 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); 677 if (!cinfo->ack_lockres) 678 goto err; 679 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0); 680 if (!cinfo->no_new_dev_lockres) 681 goto err; 682 683 /* get sync CR lock on ACK. */ 684 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR)) 685 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n", 686 ret); 687 /* get sync CR lock on no-new-dev. */ 688 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR)) 689 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret); 690 691 692 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number); 693 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1); 694 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1); 695 if (!cinfo->bitmap_lockres) 696 goto err; 697 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { 698 pr_err("Failed to get bitmap lock\n"); 699 ret = -EINVAL; 700 goto err; 701 } 702 703 INIT_LIST_HEAD(&cinfo->suspend_list); 704 spin_lock_init(&cinfo->suspend_lock); 705 706 ret = gather_all_resync_info(mddev, nodes); 707 if (ret) 708 goto err; 709 710 return 0; 711err: 712 lockres_free(cinfo->message_lockres); 713 lockres_free(cinfo->token_lockres); 714 lockres_free(cinfo->ack_lockres); 715 lockres_free(cinfo->no_new_dev_lockres); 716 lockres_free(cinfo->bitmap_lockres); 717 lockres_free(cinfo->sb_lock); 718 if (cinfo->lockspace) 719 dlm_release_lockspace(cinfo->lockspace, 2); 720 mddev->cluster_info = NULL; 721 kfree(cinfo); 722 module_put(THIS_MODULE); 723 return ret; 724} 725 726static int leave(struct mddev *mddev) 727{ 728 struct md_cluster_info *cinfo = mddev->cluster_info; 729 730 if (!cinfo) 731 return 0; 732 md_unregister_thread(&cinfo->recovery_thread); 733 md_unregister_thread(&cinfo->recv_thread); 734 lockres_free(cinfo->message_lockres); 735 lockres_free(cinfo->token_lockres); 736 lockres_free(cinfo->ack_lockres); 737 lockres_free(cinfo->no_new_dev_lockres); 738 lockres_free(cinfo->sb_lock); 739 lockres_free(cinfo->bitmap_lockres); 740 dlm_release_lockspace(cinfo->lockspace, 2); 741 return 0; 742} 743 744/* slot_number(): Returns the MD slot number to use 745 * DLM starts the slot numbers from 1, wheras cluster-md 746 * wants the number to be from zero, so we deduct one 747 */ 748static int slot_number(struct mddev *mddev) 749{ 750 struct md_cluster_info *cinfo = mddev->cluster_info; 751 752 return cinfo->slot_number - 1; 753} 754 755static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) 756{ 757 struct md_cluster_info *cinfo = mddev->cluster_info; 758 759 add_resync_info(mddev, cinfo->bitmap_lockres, lo, hi); 760 /* Re-acquire the lock to refresh LVB */ 761 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); 762} 763 764static int metadata_update_start(struct mddev *mddev) 765{ 766 return lock_comm(mddev->cluster_info); 767} 768 769static int metadata_update_finish(struct mddev *mddev) 770{ 771 struct md_cluster_info *cinfo = mddev->cluster_info; 772 struct cluster_msg cmsg; 773 int ret; 774 775 memset(&cmsg, 0, sizeof(cmsg)); 776 cmsg.type = cpu_to_le32(METADATA_UPDATED); 777 ret = __sendmsg(cinfo, &cmsg); 778 unlock_comm(cinfo); 779 return ret; 780} 781 782static int metadata_update_cancel(struct mddev *mddev) 783{ 784 struct md_cluster_info *cinfo = mddev->cluster_info; 785 786 return dlm_unlock_sync(cinfo->token_lockres); 787} 788 789static int resync_send(struct mddev *mddev, enum msg_type type, 790 sector_t lo, sector_t hi) 791{ 792 struct md_cluster_info *cinfo = mddev->cluster_info; 793 struct cluster_msg cmsg; 794 int slot = cinfo->slot_number - 1; 795 796 pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__, 797 (unsigned long long)lo, 798 (unsigned long long)hi); 799 resync_info_update(mddev, lo, hi); 800 cmsg.type = cpu_to_le32(type); 801 cmsg.slot = cpu_to_le32(slot); 802 cmsg.low = cpu_to_le64(lo); 803 cmsg.high = cpu_to_le64(hi); 804 return sendmsg(cinfo, &cmsg); 805} 806 807static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi) 808{ 809 pr_info("%s:%d\n", __func__, __LINE__); 810 return resync_send(mddev, RESYNCING, lo, hi); 811} 812 813static void resync_finish(struct mddev *mddev) 814{ 815 pr_info("%s:%d\n", __func__, __LINE__); 816 resync_send(mddev, RESYNCING, 0, 0); 817} 818 819static int area_resyncing(struct mddev *mddev, sector_t lo, sector_t hi) 820{ 821 struct md_cluster_info *cinfo = mddev->cluster_info; 822 int ret = 0; 823 struct suspend_info *s; 824 825 spin_lock_irq(&cinfo->suspend_lock); 826 if (list_empty(&cinfo->suspend_list)) 827 goto out; 828 list_for_each_entry(s, &cinfo->suspend_list, list) 829 if (hi > s->lo && lo < s->hi) { 830 ret = 1; 831 break; 832 } 833out: 834 spin_unlock_irq(&cinfo->suspend_lock); 835 return ret; 836} 837 838static int add_new_disk_start(struct mddev *mddev, struct md_rdev *rdev) 839{ 840 struct md_cluster_info *cinfo = mddev->cluster_info; 841 struct cluster_msg cmsg; 842 int ret = 0; 843 struct mdp_superblock_1 *sb = page_address(rdev->sb_page); 844 char *uuid = sb->device_uuid; 845 846 memset(&cmsg, 0, sizeof(cmsg)); 847 cmsg.type = cpu_to_le32(NEWDISK); 848 memcpy(cmsg.uuid, uuid, 16); 849 cmsg.raid_slot = rdev->desc_nr; 850 lock_comm(cinfo); 851 ret = __sendmsg(cinfo, &cmsg); 852 if (ret) 853 return ret; 854 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE; 855 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX); 856 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE; 857 /* Some node does not "see" the device */ 858 if (ret == -EAGAIN) 859 ret = -ENOENT; 860 else 861 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); 862 return ret; 863} 864 865static int add_new_disk_finish(struct mddev *mddev) 866{ 867 struct cluster_msg cmsg; 868 struct md_cluster_info *cinfo = mddev->cluster_info; 869 int ret; 870 /* Write sb and inform others */ 871 md_update_sb(mddev, 1); 872 cmsg.type = METADATA_UPDATED; 873 ret = __sendmsg(cinfo, &cmsg); 874 unlock_comm(cinfo); 875 return ret; 876} 877 878static int new_disk_ack(struct mddev *mddev, bool ack) 879{ 880 struct md_cluster_info *cinfo = mddev->cluster_info; 881 882 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) { 883 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev)); 884 return -EINVAL; 885 } 886 887 if (ack) 888 dlm_unlock_sync(cinfo->no_new_dev_lockres); 889 complete(&cinfo->newdisk_completion); 890 return 0; 891} 892 893static int remove_disk(struct mddev *mddev, struct md_rdev *rdev) 894{ 895 struct cluster_msg cmsg; 896 struct md_cluster_info *cinfo = mddev->cluster_info; 897 cmsg.type = REMOVE; 898 cmsg.raid_slot = rdev->desc_nr; 899 return __sendmsg(cinfo, &cmsg); 900} 901 902static int gather_bitmaps(struct md_rdev *rdev) 903{ 904 int sn, err; 905 sector_t lo, hi; 906 struct cluster_msg cmsg; 907 struct mddev *mddev = rdev->mddev; 908 struct md_cluster_info *cinfo = mddev->cluster_info; 909 910 cmsg.type = RE_ADD; 911 cmsg.raid_slot = rdev->desc_nr; 912 err = sendmsg(cinfo, &cmsg); 913 if (err) 914 goto out; 915 916 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) { 917 if (sn == (cinfo->slot_number - 1)) 918 continue; 919 err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false); 920 if (err) { 921 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn); 922 goto out; 923 } 924 if ((hi > 0) && (lo < mddev->recovery_cp)) 925 mddev->recovery_cp = lo; 926 } 927out: 928 return err; 929} 930 931static struct md_cluster_operations cluster_ops = { 932 .join = join, 933 .leave = leave, 934 .slot_number = slot_number, 935 .resync_info_update = resync_info_update, 936 .resync_start = resync_start, 937 .resync_finish = resync_finish, 938 .metadata_update_start = metadata_update_start, 939 .metadata_update_finish = metadata_update_finish, 940 .metadata_update_cancel = metadata_update_cancel, 941 .area_resyncing = area_resyncing, 942 .add_new_disk_start = add_new_disk_start, 943 .add_new_disk_finish = add_new_disk_finish, 944 .new_disk_ack = new_disk_ack, 945 .remove_disk = remove_disk, 946 .gather_bitmaps = gather_bitmaps, 947}; 948 949static int __init cluster_init(void) 950{ 951 pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n"); 952 pr_info("Registering Cluster MD functions\n"); 953 register_md_cluster_operations(&cluster_ops, THIS_MODULE); 954 return 0; 955} 956 957static void cluster_exit(void) 958{ 959 unregister_md_cluster_operations(); 960} 961 962module_init(cluster_init); 963module_exit(cluster_exit); 964MODULE_LICENSE("GPL"); 965MODULE_DESCRIPTION("Clustering support for MD"); 966