1/* 2 * Copyright (C) 2003 Sistina Software 3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 4 * 5 * This file is released under the LGPL. 6 */ 7 8#include <linux/init.h> 9#include <linux/slab.h> 10#include <linux/module.h> 11#include <linux/vmalloc.h> 12#include <linux/dm-io.h> 13#include <linux/dm-dirty-log.h> 14 15#include <linux/device-mapper.h> 16 17#define DM_MSG_PREFIX "dirty region log" 18 19static LIST_HEAD(_log_types); 20static DEFINE_SPINLOCK(_lock); 21 22static struct dm_dirty_log_type *__find_dirty_log_type(const char *name) 23{ 24 struct dm_dirty_log_type *log_type; 25 26 list_for_each_entry(log_type, &_log_types, list) 27 if (!strcmp(name, log_type->name)) 28 return log_type; 29 30 return NULL; 31} 32 33static struct dm_dirty_log_type *_get_dirty_log_type(const char *name) 34{ 35 struct dm_dirty_log_type *log_type; 36 37 spin_lock(&_lock); 38 39 log_type = __find_dirty_log_type(name); 40 if (log_type && !try_module_get(log_type->module)) 41 log_type = NULL; 42 43 spin_unlock(&_lock); 44 45 return log_type; 46} 47 48/* 49 * get_type 50 * @type_name 51 * 52 * Attempt to retrieve the dm_dirty_log_type by name. If not already 53 * available, attempt to load the appropriate module. 54 * 55 * Log modules are named "dm-log-" followed by the 'type_name'. 56 * Modules may contain multiple types. 57 * This function will first try the module "dm-log-<type_name>", 58 * then truncate 'type_name' on the last '-' and try again. 59 * 60 * For example, if type_name was "clustered-disk", it would search 61 * 'dm-log-clustered-disk' then 'dm-log-clustered'. 62 * 63 * Returns: dirty_log_type* on success, NULL on failure 64 */ 65static struct dm_dirty_log_type *get_type(const char *type_name) 66{ 67 char *p, *type_name_dup; 68 struct dm_dirty_log_type *log_type; 69 70 if (!type_name) 71 return NULL; 72 73 log_type = _get_dirty_log_type(type_name); 74 if (log_type) 75 return log_type; 76 77 type_name_dup = kstrdup(type_name, GFP_KERNEL); 78 if (!type_name_dup) { 79 DMWARN("No memory left to attempt log module load for \"%s\"", 80 type_name); 81 return NULL; 82 } 83 84 while (request_module("dm-log-%s", type_name_dup) || 85 !(log_type = _get_dirty_log_type(type_name))) { 86 p = strrchr(type_name_dup, '-'); 87 if (!p) 88 break; 89 p[0] = '\0'; 90 } 91 92 if (!log_type) 93 DMWARN("Module for logging type \"%s\" not found.", type_name); 94 95 kfree(type_name_dup); 96 97 return log_type; 98} 99 100static void put_type(struct dm_dirty_log_type *type) 101{ 102 if (!type) 103 return; 104 105 spin_lock(&_lock); 106 if (!__find_dirty_log_type(type->name)) 107 goto out; 108 109 module_put(type->module); 110 111out: 112 spin_unlock(&_lock); 113} 114 115int dm_dirty_log_type_register(struct dm_dirty_log_type *type) 116{ 117 int r = 0; 118 119 spin_lock(&_lock); 120 if (!__find_dirty_log_type(type->name)) 121 list_add(&type->list, &_log_types); 122 else 123 r = -EEXIST; 124 spin_unlock(&_lock); 125 126 return r; 127} 128EXPORT_SYMBOL(dm_dirty_log_type_register); 129 130int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type) 131{ 132 spin_lock(&_lock); 133 134 if (!__find_dirty_log_type(type->name)) { 135 spin_unlock(&_lock); 136 return -EINVAL; 137 } 138 139 list_del(&type->list); 140 141 spin_unlock(&_lock); 142 143 return 0; 144} 145EXPORT_SYMBOL(dm_dirty_log_type_unregister); 146 147struct dm_dirty_log *dm_dirty_log_create(const char *type_name, 148 struct dm_target *ti, 149 int (*flush_callback_fn)(struct dm_target *ti), 150 unsigned int argc, char **argv) 151{ 152 struct dm_dirty_log_type *type; 153 struct dm_dirty_log *log; 154 155 log = kmalloc(sizeof(*log), GFP_KERNEL); 156 if (!log) 157 return NULL; 158 159 type = get_type(type_name); 160 if (!type) { 161 kfree(log); 162 return NULL; 163 } 164 165 log->flush_callback_fn = flush_callback_fn; 166 log->type = type; 167 if (type->ctr(log, ti, argc, argv)) { 168 kfree(log); 169 put_type(type); 170 return NULL; 171 } 172 173 return log; 174} 175EXPORT_SYMBOL(dm_dirty_log_create); 176 177void dm_dirty_log_destroy(struct dm_dirty_log *log) 178{ 179 log->type->dtr(log); 180 put_type(log->type); 181 kfree(log); 182} 183EXPORT_SYMBOL(dm_dirty_log_destroy); 184 185/*----------------------------------------------------------------- 186 * Persistent and core logs share a lot of their implementation. 187 * FIXME: need a reload method to be called from a resume 188 *---------------------------------------------------------------*/ 189/* 190 * Magic for persistent mirrors: "MiRr" 191 */ 192#define MIRROR_MAGIC 0x4D695272 193 194/* 195 * The on-disk version of the metadata. 196 */ 197#define MIRROR_DISK_VERSION 2 198#define LOG_OFFSET 2 199 200struct log_header_disk { 201 __le32 magic; 202 203 /* 204 * Simple, incrementing version. no backward 205 * compatibility. 206 */ 207 __le32 version; 208 __le64 nr_regions; 209} __packed; 210 211struct log_header_core { 212 uint32_t magic; 213 uint32_t version; 214 uint64_t nr_regions; 215}; 216 217struct log_c { 218 struct dm_target *ti; 219 int touched_dirtied; 220 int touched_cleaned; 221 int flush_failed; 222 uint32_t region_size; 223 unsigned int region_count; 224 region_t sync_count; 225 226 unsigned bitset_uint32_count; 227 uint32_t *clean_bits; 228 uint32_t *sync_bits; 229 uint32_t *recovering_bits; /* FIXME: this seems excessive */ 230 231 int sync_search; 232 233 /* Resync flag */ 234 enum sync { 235 DEFAULTSYNC, /* Synchronize if necessary */ 236 NOSYNC, /* Devices known to be already in sync */ 237 FORCESYNC, /* Force a sync to happen */ 238 } sync; 239 240 struct dm_io_request io_req; 241 242 /* 243 * Disk log fields 244 */ 245 int log_dev_failed; 246 int log_dev_flush_failed; 247 struct dm_dev *log_dev; 248 struct log_header_core header; 249 250 struct dm_io_region header_location; 251 struct log_header_disk *disk_header; 252}; 253 254/* 255 * The touched member needs to be updated every time we access 256 * one of the bitsets. 257 */ 258static inline int log_test_bit(uint32_t *bs, unsigned bit) 259{ 260 return test_bit_le(bit, bs) ? 1 : 0; 261} 262 263static inline void log_set_bit(struct log_c *l, 264 uint32_t *bs, unsigned bit) 265{ 266 __set_bit_le(bit, bs); 267 l->touched_cleaned = 1; 268} 269 270static inline void log_clear_bit(struct log_c *l, 271 uint32_t *bs, unsigned bit) 272{ 273 __clear_bit_le(bit, bs); 274 l->touched_dirtied = 1; 275} 276 277/*---------------------------------------------------------------- 278 * Header IO 279 *--------------------------------------------------------------*/ 280static void header_to_disk(struct log_header_core *core, struct log_header_disk *disk) 281{ 282 disk->magic = cpu_to_le32(core->magic); 283 disk->version = cpu_to_le32(core->version); 284 disk->nr_regions = cpu_to_le64(core->nr_regions); 285} 286 287static void header_from_disk(struct log_header_core *core, struct log_header_disk *disk) 288{ 289 core->magic = le32_to_cpu(disk->magic); 290 core->version = le32_to_cpu(disk->version); 291 core->nr_regions = le64_to_cpu(disk->nr_regions); 292} 293 294static int rw_header(struct log_c *lc, int rw) 295{ 296 lc->io_req.bi_rw = rw; 297 298 return dm_io(&lc->io_req, 1, &lc->header_location, NULL); 299} 300 301static int flush_header(struct log_c *lc) 302{ 303 struct dm_io_region null_location = { 304 .bdev = lc->header_location.bdev, 305 .sector = 0, 306 .count = 0, 307 }; 308 309 lc->io_req.bi_rw = WRITE_FLUSH; 310 311 return dm_io(&lc->io_req, 1, &null_location, NULL); 312} 313 314static int read_header(struct log_c *log) 315{ 316 int r; 317 318 r = rw_header(log, READ); 319 if (r) 320 return r; 321 322 header_from_disk(&log->header, log->disk_header); 323 324 /* New log required? */ 325 if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { 326 log->header.magic = MIRROR_MAGIC; 327 log->header.version = MIRROR_DISK_VERSION; 328 log->header.nr_regions = 0; 329 } 330 331#ifdef __LITTLE_ENDIAN 332 if (log->header.version == 1) 333 log->header.version = 2; 334#endif 335 336 if (log->header.version != MIRROR_DISK_VERSION) { 337 DMWARN("incompatible disk log version"); 338 return -EINVAL; 339 } 340 341 return 0; 342} 343 344static int _check_region_size(struct dm_target *ti, uint32_t region_size) 345{ 346 if (region_size < 2 || region_size > ti->len) 347 return 0; 348 349 if (!is_power_of_2(region_size)) 350 return 0; 351 352 return 1; 353} 354 355/*---------------------------------------------------------------- 356 * core log constructor/destructor 357 * 358 * argv contains region_size followed optionally by [no]sync 359 *--------------------------------------------------------------*/ 360#define BYTE_SHIFT 3 361static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, 362 unsigned int argc, char **argv, 363 struct dm_dev *dev) 364{ 365 enum sync sync = DEFAULTSYNC; 366 367 struct log_c *lc; 368 uint32_t region_size; 369 unsigned int region_count; 370 size_t bitset_size, buf_size; 371 int r; 372 char dummy; 373 374 if (argc < 1 || argc > 2) { 375 DMWARN("wrong number of arguments to dirty region log"); 376 return -EINVAL; 377 } 378 379 if (argc > 1) { 380 if (!strcmp(argv[1], "sync")) 381 sync = FORCESYNC; 382 else if (!strcmp(argv[1], "nosync")) 383 sync = NOSYNC; 384 else { 385 DMWARN("unrecognised sync argument to " 386 "dirty region log: %s", argv[1]); 387 return -EINVAL; 388 } 389 } 390 391 if (sscanf(argv[0], "%u%c", ®ion_size, &dummy) != 1 || 392 !_check_region_size(ti, region_size)) { 393 DMWARN("invalid region size %s", argv[0]); 394 return -EINVAL; 395 } 396 397 region_count = dm_sector_div_up(ti->len, region_size); 398 399 lc = kmalloc(sizeof(*lc), GFP_KERNEL); 400 if (!lc) { 401 DMWARN("couldn't allocate core log"); 402 return -ENOMEM; 403 } 404 405 lc->ti = ti; 406 lc->touched_dirtied = 0; 407 lc->touched_cleaned = 0; 408 lc->flush_failed = 0; 409 lc->region_size = region_size; 410 lc->region_count = region_count; 411 lc->sync = sync; 412 413 /* 414 * Work out how many "unsigned long"s we need to hold the bitset. 415 */ 416 bitset_size = dm_round_up(region_count, 417 sizeof(*lc->clean_bits) << BYTE_SHIFT); 418 bitset_size >>= BYTE_SHIFT; 419 420 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); 421 422 /* 423 * Disk log? 424 */ 425 if (!dev) { 426 lc->clean_bits = vmalloc(bitset_size); 427 if (!lc->clean_bits) { 428 DMWARN("couldn't allocate clean bitset"); 429 kfree(lc); 430 return -ENOMEM; 431 } 432 lc->disk_header = NULL; 433 } else { 434 lc->log_dev = dev; 435 lc->log_dev_failed = 0; 436 lc->log_dev_flush_failed = 0; 437 lc->header_location.bdev = lc->log_dev->bdev; 438 lc->header_location.sector = 0; 439 440 /* 441 * Buffer holds both header and bitset. 442 */ 443 buf_size = 444 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, 445 bdev_logical_block_size(lc->header_location. 446 bdev)); 447 448 if (buf_size > i_size_read(dev->bdev->bd_inode)) { 449 DMWARN("log device %s too small: need %llu bytes", 450 dev->name, (unsigned long long)buf_size); 451 kfree(lc); 452 return -EINVAL; 453 } 454 455 lc->header_location.count = buf_size >> SECTOR_SHIFT; 456 457 lc->io_req.mem.type = DM_IO_VMA; 458 lc->io_req.notify.fn = NULL; 459 lc->io_req.client = dm_io_client_create(); 460 if (IS_ERR(lc->io_req.client)) { 461 r = PTR_ERR(lc->io_req.client); 462 DMWARN("couldn't allocate disk io client"); 463 kfree(lc); 464 return r; 465 } 466 467 lc->disk_header = vmalloc(buf_size); 468 if (!lc->disk_header) { 469 DMWARN("couldn't allocate disk log buffer"); 470 dm_io_client_destroy(lc->io_req.client); 471 kfree(lc); 472 return -ENOMEM; 473 } 474 475 lc->io_req.mem.ptr.vma = lc->disk_header; 476 lc->clean_bits = (void *)lc->disk_header + 477 (LOG_OFFSET << SECTOR_SHIFT); 478 } 479 480 memset(lc->clean_bits, -1, bitset_size); 481 482 lc->sync_bits = vmalloc(bitset_size); 483 if (!lc->sync_bits) { 484 DMWARN("couldn't allocate sync bitset"); 485 if (!dev) 486 vfree(lc->clean_bits); 487 else 488 dm_io_client_destroy(lc->io_req.client); 489 vfree(lc->disk_header); 490 kfree(lc); 491 return -ENOMEM; 492 } 493 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); 494 lc->sync_count = (sync == NOSYNC) ? region_count : 0; 495 496 lc->recovering_bits = vzalloc(bitset_size); 497 if (!lc->recovering_bits) { 498 DMWARN("couldn't allocate sync bitset"); 499 vfree(lc->sync_bits); 500 if (!dev) 501 vfree(lc->clean_bits); 502 else 503 dm_io_client_destroy(lc->io_req.client); 504 vfree(lc->disk_header); 505 kfree(lc); 506 return -ENOMEM; 507 } 508 lc->sync_search = 0; 509 log->context = lc; 510 511 return 0; 512} 513 514static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, 515 unsigned int argc, char **argv) 516{ 517 return create_log_context(log, ti, argc, argv, NULL); 518} 519 520static void destroy_log_context(struct log_c *lc) 521{ 522 vfree(lc->sync_bits); 523 vfree(lc->recovering_bits); 524 kfree(lc); 525} 526 527static void core_dtr(struct dm_dirty_log *log) 528{ 529 struct log_c *lc = (struct log_c *) log->context; 530 531 vfree(lc->clean_bits); 532 destroy_log_context(lc); 533} 534 535/*---------------------------------------------------------------- 536 * disk log constructor/destructor 537 * 538 * argv contains log_device region_size followed optionally by [no]sync 539 *--------------------------------------------------------------*/ 540static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, 541 unsigned int argc, char **argv) 542{ 543 int r; 544 struct dm_dev *dev; 545 546 if (argc < 2 || argc > 3) { 547 DMWARN("wrong number of arguments to disk dirty region log"); 548 return -EINVAL; 549 } 550 551 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); 552 if (r) 553 return r; 554 555 r = create_log_context(log, ti, argc - 1, argv + 1, dev); 556 if (r) { 557 dm_put_device(ti, dev); 558 return r; 559 } 560 561 return 0; 562} 563 564static void disk_dtr(struct dm_dirty_log *log) 565{ 566 struct log_c *lc = (struct log_c *) log->context; 567 568 dm_put_device(lc->ti, lc->log_dev); 569 vfree(lc->disk_header); 570 dm_io_client_destroy(lc->io_req.client); 571 destroy_log_context(lc); 572} 573 574static void fail_log_device(struct log_c *lc) 575{ 576 if (lc->log_dev_failed) 577 return; 578 579 lc->log_dev_failed = 1; 580 dm_table_event(lc->ti->table); 581} 582 583static int disk_resume(struct dm_dirty_log *log) 584{ 585 int r; 586 unsigned i; 587 struct log_c *lc = (struct log_c *) log->context; 588 size_t size = lc->bitset_uint32_count * sizeof(uint32_t); 589 590 /* read the disk header */ 591 r = read_header(lc); 592 if (r) { 593 DMWARN("%s: Failed to read header on dirty region log device", 594 lc->log_dev->name); 595 fail_log_device(lc); 596 /* 597 * If the log device cannot be read, we must assume 598 * all regions are out-of-sync. If we simply return 599 * here, the state will be uninitialized and could 600 * lead us to return 'in-sync' status for regions 601 * that are actually 'out-of-sync'. 602 */ 603 lc->header.nr_regions = 0; 604 } 605 606 /* set or clear any new bits -- device has grown */ 607 if (lc->sync == NOSYNC) 608 for (i = lc->header.nr_regions; i < lc->region_count; i++) 609 /* FIXME: amazingly inefficient */ 610 log_set_bit(lc, lc->clean_bits, i); 611 else 612 for (i = lc->header.nr_regions; i < lc->region_count; i++) 613 /* FIXME: amazingly inefficient */ 614 log_clear_bit(lc, lc->clean_bits, i); 615 616 /* clear any old bits -- device has shrunk */ 617 for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) 618 log_clear_bit(lc, lc->clean_bits, i); 619 620 /* copy clean across to sync */ 621 memcpy(lc->sync_bits, lc->clean_bits, size); 622 lc->sync_count = memweight(lc->clean_bits, 623 lc->bitset_uint32_count * sizeof(uint32_t)); 624 lc->sync_search = 0; 625 626 /* set the correct number of regions in the header */ 627 lc->header.nr_regions = lc->region_count; 628 629 header_to_disk(&lc->header, lc->disk_header); 630 631 /* write the new header */ 632 r = rw_header(lc, WRITE); 633 if (!r) { 634 r = flush_header(lc); 635 if (r) 636 lc->log_dev_flush_failed = 1; 637 } 638 if (r) { 639 DMWARN("%s: Failed to write header on dirty region log device", 640 lc->log_dev->name); 641 fail_log_device(lc); 642 } 643 644 return r; 645} 646 647static uint32_t core_get_region_size(struct dm_dirty_log *log) 648{ 649 struct log_c *lc = (struct log_c *) log->context; 650 return lc->region_size; 651} 652 653static int core_resume(struct dm_dirty_log *log) 654{ 655 struct log_c *lc = (struct log_c *) log->context; 656 lc->sync_search = 0; 657 return 0; 658} 659 660static int core_is_clean(struct dm_dirty_log *log, region_t region) 661{ 662 struct log_c *lc = (struct log_c *) log->context; 663 return log_test_bit(lc->clean_bits, region); 664} 665 666static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) 667{ 668 struct log_c *lc = (struct log_c *) log->context; 669 return log_test_bit(lc->sync_bits, region); 670} 671 672static int core_flush(struct dm_dirty_log *log) 673{ 674 /* no op */ 675 return 0; 676} 677 678static int disk_flush(struct dm_dirty_log *log) 679{ 680 int r, i; 681 struct log_c *lc = log->context; 682 683 /* only write if the log has changed */ 684 if (!lc->touched_cleaned && !lc->touched_dirtied) 685 return 0; 686 687 if (lc->touched_cleaned && log->flush_callback_fn && 688 log->flush_callback_fn(lc->ti)) { 689 /* 690 * At this point it is impossible to determine which 691 * regions are clean and which are dirty (without 692 * re-reading the log off disk). So mark all of them 693 * dirty. 694 */ 695 lc->flush_failed = 1; 696 for (i = 0; i < lc->region_count; i++) 697 log_clear_bit(lc, lc->clean_bits, i); 698 } 699 700 r = rw_header(lc, WRITE); 701 if (r) 702 fail_log_device(lc); 703 else { 704 if (lc->touched_dirtied) { 705 r = flush_header(lc); 706 if (r) { 707 lc->log_dev_flush_failed = 1; 708 fail_log_device(lc); 709 } else 710 lc->touched_dirtied = 0; 711 } 712 lc->touched_cleaned = 0; 713 } 714 715 return r; 716} 717 718static void core_mark_region(struct dm_dirty_log *log, region_t region) 719{ 720 struct log_c *lc = (struct log_c *) log->context; 721 log_clear_bit(lc, lc->clean_bits, region); 722} 723 724static void core_clear_region(struct dm_dirty_log *log, region_t region) 725{ 726 struct log_c *lc = (struct log_c *) log->context; 727 if (likely(!lc->flush_failed)) 728 log_set_bit(lc, lc->clean_bits, region); 729} 730 731static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) 732{ 733 struct log_c *lc = (struct log_c *) log->context; 734 735 if (lc->sync_search >= lc->region_count) 736 return 0; 737 738 do { 739 *region = find_next_zero_bit_le(lc->sync_bits, 740 lc->region_count, 741 lc->sync_search); 742 lc->sync_search = *region + 1; 743 744 if (*region >= lc->region_count) 745 return 0; 746 747 } while (log_test_bit(lc->recovering_bits, *region)); 748 749 log_set_bit(lc, lc->recovering_bits, *region); 750 return 1; 751} 752 753static void core_set_region_sync(struct dm_dirty_log *log, region_t region, 754 int in_sync) 755{ 756 struct log_c *lc = (struct log_c *) log->context; 757 758 log_clear_bit(lc, lc->recovering_bits, region); 759 if (in_sync) { 760 log_set_bit(lc, lc->sync_bits, region); 761 lc->sync_count++; 762 } else if (log_test_bit(lc->sync_bits, region)) { 763 lc->sync_count--; 764 log_clear_bit(lc, lc->sync_bits, region); 765 } 766} 767 768static region_t core_get_sync_count(struct dm_dirty_log *log) 769{ 770 struct log_c *lc = (struct log_c *) log->context; 771 772 return lc->sync_count; 773} 774 775#define DMEMIT_SYNC \ 776 if (lc->sync != DEFAULTSYNC) \ 777 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") 778 779static int core_status(struct dm_dirty_log *log, status_type_t status, 780 char *result, unsigned int maxlen) 781{ 782 int sz = 0; 783 struct log_c *lc = log->context; 784 785 switch(status) { 786 case STATUSTYPE_INFO: 787 DMEMIT("1 %s", log->type->name); 788 break; 789 790 case STATUSTYPE_TABLE: 791 DMEMIT("%s %u %u ", log->type->name, 792 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); 793 DMEMIT_SYNC; 794 } 795 796 return sz; 797} 798 799static int disk_status(struct dm_dirty_log *log, status_type_t status, 800 char *result, unsigned int maxlen) 801{ 802 int sz = 0; 803 struct log_c *lc = log->context; 804 805 switch(status) { 806 case STATUSTYPE_INFO: 807 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, 808 lc->log_dev_flush_failed ? 'F' : 809 lc->log_dev_failed ? 'D' : 810 'A'); 811 break; 812 813 case STATUSTYPE_TABLE: 814 DMEMIT("%s %u %s %u ", log->type->name, 815 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, 816 lc->region_size); 817 DMEMIT_SYNC; 818 } 819 820 return sz; 821} 822 823static struct dm_dirty_log_type _core_type = { 824 .name = "core", 825 .module = THIS_MODULE, 826 .ctr = core_ctr, 827 .dtr = core_dtr, 828 .resume = core_resume, 829 .get_region_size = core_get_region_size, 830 .is_clean = core_is_clean, 831 .in_sync = core_in_sync, 832 .flush = core_flush, 833 .mark_region = core_mark_region, 834 .clear_region = core_clear_region, 835 .get_resync_work = core_get_resync_work, 836 .set_region_sync = core_set_region_sync, 837 .get_sync_count = core_get_sync_count, 838 .status = core_status, 839}; 840 841static struct dm_dirty_log_type _disk_type = { 842 .name = "disk", 843 .module = THIS_MODULE, 844 .ctr = disk_ctr, 845 .dtr = disk_dtr, 846 .postsuspend = disk_flush, 847 .resume = disk_resume, 848 .get_region_size = core_get_region_size, 849 .is_clean = core_is_clean, 850 .in_sync = core_in_sync, 851 .flush = disk_flush, 852 .mark_region = core_mark_region, 853 .clear_region = core_clear_region, 854 .get_resync_work = core_get_resync_work, 855 .set_region_sync = core_set_region_sync, 856 .get_sync_count = core_get_sync_count, 857 .status = disk_status, 858}; 859 860static int __init dm_dirty_log_init(void) 861{ 862 int r; 863 864 r = dm_dirty_log_type_register(&_core_type); 865 if (r) 866 DMWARN("couldn't register core log"); 867 868 r = dm_dirty_log_type_register(&_disk_type); 869 if (r) { 870 DMWARN("couldn't register disk type"); 871 dm_dirty_log_type_unregister(&_core_type); 872 } 873 874 return r; 875} 876 877static void __exit dm_dirty_log_exit(void) 878{ 879 dm_dirty_log_type_unregister(&_disk_type); 880 dm_dirty_log_type_unregister(&_core_type); 881} 882 883module_init(dm_dirty_log_init); 884module_exit(dm_dirty_log_exit); 885 886MODULE_DESCRIPTION(DM_NAME " dirty region log"); 887MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); 888MODULE_LICENSE("GPL"); 889