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 * Magic for persistent mirrors: "MiRr" 187 */ 188#define MIRROR_MAGIC 0x4D695272 189 190/* 191 * The on-disk version of the metadata. 192 */ 193#define MIRROR_DISK_VERSION 2 194#define LOG_OFFSET 2 195 196struct log_header { 197 uint32_t magic; 198 199 /* 200 * Simple, incrementing version. no backward 201 * compatibility. 202 */ 203 uint32_t version; 204 sector_t nr_regions; 205}; 206 207struct log_c { 208 struct dm_target *ti; 209 int touched_dirtied; 210 int touched_cleaned; 211 int flush_failed; 212 uint32_t region_size; 213 unsigned int region_count; 214 region_t sync_count; 215 216 unsigned bitset_uint32_count; 217 uint32_t *clean_bits; 218 uint32_t *sync_bits; 219 uint32_t *recovering_bits; 220 221 int sync_search; 222 223 /* Resync flag */ 224 enum sync { 225 DEFAULTSYNC, /* Synchronize if necessary */ 226 NOSYNC, /* Devices known to be already in sync */ 227 FORCESYNC, /* Force a sync to happen */ 228 } sync; 229 230 struct dm_io_request io_req; 231 232 /* 233 * Disk log fields 234 */ 235 int log_dev_failed; 236 int log_dev_flush_failed; 237 struct dm_dev *log_dev; 238 struct log_header header; 239 240 struct dm_io_region header_location; 241 struct log_header *disk_header; 242}; 243 244/* 245 * The touched member needs to be updated every time we access 246 * one of the bitsets. 247 */ 248static inline int log_test_bit(uint32_t *bs, unsigned bit) 249{ 250 return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0; 251} 252 253static inline void log_set_bit(struct log_c *l, 254 uint32_t *bs, unsigned bit) 255{ 256 ext2_set_bit(bit, (unsigned long *) bs); 257 l->touched_cleaned = 1; 258} 259 260static inline void log_clear_bit(struct log_c *l, 261 uint32_t *bs, unsigned bit) 262{ 263 ext2_clear_bit(bit, (unsigned long *) bs); 264 l->touched_dirtied = 1; 265} 266 267/*---------------------------------------------------------------- 268 * Header IO 269 *--------------------------------------------------------------*/ 270static void header_to_disk(struct log_header *core, struct log_header *disk) 271{ 272 disk->magic = cpu_to_le32(core->magic); 273 disk->version = cpu_to_le32(core->version); 274 disk->nr_regions = cpu_to_le64(core->nr_regions); 275} 276 277static void header_from_disk(struct log_header *core, struct log_header *disk) 278{ 279 core->magic = le32_to_cpu(disk->magic); 280 core->version = le32_to_cpu(disk->version); 281 core->nr_regions = le64_to_cpu(disk->nr_regions); 282} 283 284static int rw_header(struct log_c *lc, int rw) 285{ 286 lc->io_req.bi_rw = rw; 287 288 return dm_io(&lc->io_req, 1, &lc->header_location, NULL); 289} 290 291static int flush_header(struct log_c *lc) 292{ 293 struct dm_io_region null_location = { 294 .bdev = lc->header_location.bdev, 295 .sector = 0, 296 .count = 0, 297 }; 298 299 lc->io_req.bi_rw = WRITE_BARRIER; 300 301 return dm_io(&lc->io_req, 1, &null_location, NULL); 302} 303 304static int read_header(struct log_c *log) 305{ 306 int r; 307 308 r = rw_header(log, READ); 309 if (r) 310 return r; 311 312 header_from_disk(&log->header, log->disk_header); 313 314 /* New log required? */ 315 if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { 316 log->header.magic = MIRROR_MAGIC; 317 log->header.version = MIRROR_DISK_VERSION; 318 log->header.nr_regions = 0; 319 } 320 321#ifdef __LITTLE_ENDIAN 322 if (log->header.version == 1) 323 log->header.version = 2; 324#endif 325 326 if (log->header.version != MIRROR_DISK_VERSION) { 327 DMWARN("incompatible disk log version"); 328 return -EINVAL; 329 } 330 331 return 0; 332} 333 334static int _check_region_size(struct dm_target *ti, uint32_t region_size) 335{ 336 if (region_size < 2 || region_size > ti->len) 337 return 0; 338 339 if (!is_power_of_2(region_size)) 340 return 0; 341 342 return 1; 343} 344 345/*---------------------------------------------------------------- 346 * core log constructor/destructor 347 * 348 * argv contains region_size followed optionally by [no]sync 349 *--------------------------------------------------------------*/ 350#define BYTE_SHIFT 3 351static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, 352 unsigned int argc, char **argv, 353 struct dm_dev *dev) 354{ 355 enum sync sync = DEFAULTSYNC; 356 357 struct log_c *lc; 358 uint32_t region_size; 359 unsigned int region_count; 360 size_t bitset_size, buf_size; 361 int r; 362 363 if (argc < 1 || argc > 2) { 364 DMWARN("wrong number of arguments to dirty region log"); 365 return -EINVAL; 366 } 367 368 if (argc > 1) { 369 if (!strcmp(argv[1], "sync")) 370 sync = FORCESYNC; 371 else if (!strcmp(argv[1], "nosync")) 372 sync = NOSYNC; 373 else { 374 DMWARN("unrecognised sync argument to " 375 "dirty region log: %s", argv[1]); 376 return -EINVAL; 377 } 378 } 379 380 if (sscanf(argv[0], "%u", ®ion_size) != 1 || 381 !_check_region_size(ti, region_size)) { 382 DMWARN("invalid region size %s", argv[0]); 383 return -EINVAL; 384 } 385 386 region_count = dm_sector_div_up(ti->len, region_size); 387 388 lc = kmalloc(sizeof(*lc), GFP_KERNEL); 389 if (!lc) { 390 DMWARN("couldn't allocate core log"); 391 return -ENOMEM; 392 } 393 394 lc->ti = ti; 395 lc->touched_dirtied = 0; 396 lc->touched_cleaned = 0; 397 lc->flush_failed = 0; 398 lc->region_size = region_size; 399 lc->region_count = region_count; 400 lc->sync = sync; 401 402 /* 403 * Work out how many "unsigned long"s we need to hold the bitset. 404 */ 405 bitset_size = dm_round_up(region_count, 406 sizeof(*lc->clean_bits) << BYTE_SHIFT); 407 bitset_size >>= BYTE_SHIFT; 408 409 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); 410 411 /* 412 * Disk log? 413 */ 414 if (!dev) { 415 lc->clean_bits = vmalloc(bitset_size); 416 if (!lc->clean_bits) { 417 DMWARN("couldn't allocate clean bitset"); 418 kfree(lc); 419 return -ENOMEM; 420 } 421 lc->disk_header = NULL; 422 } else { 423 lc->log_dev = dev; 424 lc->log_dev_failed = 0; 425 lc->log_dev_flush_failed = 0; 426 lc->header_location.bdev = lc->log_dev->bdev; 427 lc->header_location.sector = 0; 428 429 /* 430 * Buffer holds both header and bitset. 431 */ 432 buf_size = 433 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, 434 bdev_logical_block_size(lc->header_location. 435 bdev)); 436 437 if (buf_size > i_size_read(dev->bdev->bd_inode)) { 438 DMWARN("log device %s too small: need %llu bytes", 439 dev->name, (unsigned long long)buf_size); 440 kfree(lc); 441 return -EINVAL; 442 } 443 444 lc->header_location.count = buf_size >> SECTOR_SHIFT; 445 446 lc->io_req.mem.type = DM_IO_VMA; 447 lc->io_req.notify.fn = NULL; 448 lc->io_req.client = dm_io_client_create(dm_div_up(buf_size, 449 PAGE_SIZE)); 450 if (IS_ERR(lc->io_req.client)) { 451 r = PTR_ERR(lc->io_req.client); 452 DMWARN("couldn't allocate disk io client"); 453 kfree(lc); 454 return -ENOMEM; 455 } 456 457 lc->disk_header = vmalloc(buf_size); 458 if (!lc->disk_header) { 459 DMWARN("couldn't allocate disk log buffer"); 460 dm_io_client_destroy(lc->io_req.client); 461 kfree(lc); 462 return -ENOMEM; 463 } 464 465 lc->io_req.mem.ptr.vma = lc->disk_header; 466 lc->clean_bits = (void *)lc->disk_header + 467 (LOG_OFFSET << SECTOR_SHIFT); 468 } 469 470 memset(lc->clean_bits, -1, bitset_size); 471 472 lc->sync_bits = vmalloc(bitset_size); 473 if (!lc->sync_bits) { 474 DMWARN("couldn't allocate sync bitset"); 475 if (!dev) 476 vfree(lc->clean_bits); 477 else 478 dm_io_client_destroy(lc->io_req.client); 479 vfree(lc->disk_header); 480 kfree(lc); 481 return -ENOMEM; 482 } 483 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); 484 lc->sync_count = (sync == NOSYNC) ? region_count : 0; 485 486 lc->recovering_bits = vmalloc(bitset_size); 487 if (!lc->recovering_bits) { 488 DMWARN("couldn't allocate sync bitset"); 489 vfree(lc->sync_bits); 490 if (!dev) 491 vfree(lc->clean_bits); 492 else 493 dm_io_client_destroy(lc->io_req.client); 494 vfree(lc->disk_header); 495 kfree(lc); 496 return -ENOMEM; 497 } 498 memset(lc->recovering_bits, 0, bitset_size); 499 lc->sync_search = 0; 500 log->context = lc; 501 502 return 0; 503} 504 505static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, 506 unsigned int argc, char **argv) 507{ 508 return create_log_context(log, ti, argc, argv, NULL); 509} 510 511static void destroy_log_context(struct log_c *lc) 512{ 513 vfree(lc->sync_bits); 514 vfree(lc->recovering_bits); 515 kfree(lc); 516} 517 518static void core_dtr(struct dm_dirty_log *log) 519{ 520 struct log_c *lc = (struct log_c *) log->context; 521 522 vfree(lc->clean_bits); 523 destroy_log_context(lc); 524} 525 526/*---------------------------------------------------------------- 527 * disk log constructor/destructor 528 * 529 * argv contains log_device region_size followed optionally by [no]sync 530 *--------------------------------------------------------------*/ 531static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, 532 unsigned int argc, char **argv) 533{ 534 int r; 535 struct dm_dev *dev; 536 537 if (argc < 2 || argc > 3) { 538 DMWARN("wrong number of arguments to disk dirty region log"); 539 return -EINVAL; 540 } 541 542 r = dm_get_device(ti, argv[0], FMODE_READ | FMODE_WRITE, &dev); 543 if (r) 544 return r; 545 546 r = create_log_context(log, ti, argc - 1, argv + 1, dev); 547 if (r) { 548 dm_put_device(ti, dev); 549 return r; 550 } 551 552 return 0; 553} 554 555static void disk_dtr(struct dm_dirty_log *log) 556{ 557 struct log_c *lc = (struct log_c *) log->context; 558 559 dm_put_device(lc->ti, lc->log_dev); 560 vfree(lc->disk_header); 561 dm_io_client_destroy(lc->io_req.client); 562 destroy_log_context(lc); 563} 564 565static int count_bits32(uint32_t *addr, unsigned size) 566{ 567 int count = 0, i; 568 569 for (i = 0; i < size; i++) { 570 count += hweight32(*(addr+i)); 571 } 572 return count; 573} 574 575static void fail_log_device(struct log_c *lc) 576{ 577 if (lc->log_dev_failed) 578 return; 579 580 lc->log_dev_failed = 1; 581 dm_table_event(lc->ti->table); 582} 583 584static int disk_resume(struct dm_dirty_log *log) 585{ 586 int r; 587 unsigned i; 588 struct log_c *lc = (struct log_c *) log->context; 589 size_t size = lc->bitset_uint32_count * sizeof(uint32_t); 590 591 /* read the disk header */ 592 r = read_header(lc); 593 if (r) { 594 DMWARN("%s: Failed to read header on dirty region log device", 595 lc->log_dev->name); 596 fail_log_device(lc); 597 /* 598 * If the log device cannot be read, we must assume 599 * all regions are out-of-sync. If we simply return 600 * here, the state will be uninitialized and could 601 * lead us to return 'in-sync' status for regions 602 * that are actually 'out-of-sync'. 603 */ 604 lc->header.nr_regions = 0; 605 } 606 607 /* set or clear any new bits -- device has grown */ 608 if (lc->sync == NOSYNC) 609 for (i = lc->header.nr_regions; i < lc->region_count; i++) 610 log_set_bit(lc, lc->clean_bits, i); 611 else 612 for (i = lc->header.nr_regions; i < lc->region_count; i++) 613 log_clear_bit(lc, lc->clean_bits, i); 614 615 /* clear any old bits -- device has shrunk */ 616 for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) 617 log_clear_bit(lc, lc->clean_bits, i); 618 619 /* copy clean across to sync */ 620 memcpy(lc->sync_bits, lc->clean_bits, size); 621 lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); 622 lc->sync_search = 0; 623 624 /* set the correct number of regions in the header */ 625 lc->header.nr_regions = lc->region_count; 626 627 header_to_disk(&lc->header, lc->disk_header); 628 629 /* write the new header */ 630 r = rw_header(lc, WRITE); 631 if (!r) { 632 r = flush_header(lc); 633 if (r) 634 lc->log_dev_flush_failed = 1; 635 } 636 if (r) { 637 DMWARN("%s: Failed to write header on dirty region log device", 638 lc->log_dev->name); 639 fail_log_device(lc); 640 } 641 642 return r; 643} 644 645static uint32_t core_get_region_size(struct dm_dirty_log *log) 646{ 647 struct log_c *lc = (struct log_c *) log->context; 648 return lc->region_size; 649} 650 651static int core_resume(struct dm_dirty_log *log) 652{ 653 struct log_c *lc = (struct log_c *) log->context; 654 lc->sync_search = 0; 655 return 0; 656} 657 658static int core_is_clean(struct dm_dirty_log *log, region_t region) 659{ 660 struct log_c *lc = (struct log_c *) log->context; 661 return log_test_bit(lc->clean_bits, region); 662} 663 664static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) 665{ 666 struct log_c *lc = (struct log_c *) log->context; 667 return log_test_bit(lc->sync_bits, region); 668} 669 670static int core_flush(struct dm_dirty_log *log) 671{ 672 /* no op */ 673 return 0; 674} 675 676static int disk_flush(struct dm_dirty_log *log) 677{ 678 int r, i; 679 struct log_c *lc = log->context; 680 681 /* only write if the log has changed */ 682 if (!lc->touched_cleaned && !lc->touched_dirtied) 683 return 0; 684 685 if (lc->touched_cleaned && log->flush_callback_fn && 686 log->flush_callback_fn(lc->ti)) { 687 /* 688 * At this point it is impossible to determine which 689 * regions are clean and which are dirty (without 690 * re-reading the log off disk). So mark all of them 691 * dirty. 692 */ 693 lc->flush_failed = 1; 694 for (i = 0; i < lc->region_count; i++) 695 log_clear_bit(lc, lc->clean_bits, i); 696 } 697 698 r = rw_header(lc, WRITE); 699 if (r) 700 fail_log_device(lc); 701 else { 702 if (lc->touched_dirtied) { 703 r = flush_header(lc); 704 if (r) { 705 lc->log_dev_flush_failed = 1; 706 fail_log_device(lc); 707 } else 708 lc->touched_dirtied = 0; 709 } 710 lc->touched_cleaned = 0; 711 } 712 713 return r; 714} 715 716static void core_mark_region(struct dm_dirty_log *log, region_t region) 717{ 718 struct log_c *lc = (struct log_c *) log->context; 719 log_clear_bit(lc, lc->clean_bits, region); 720} 721 722static void core_clear_region(struct dm_dirty_log *log, region_t region) 723{ 724 struct log_c *lc = (struct log_c *) log->context; 725 if (likely(!lc->flush_failed)) 726 log_set_bit(lc, lc->clean_bits, region); 727} 728 729static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) 730{ 731 struct log_c *lc = (struct log_c *) log->context; 732 733 if (lc->sync_search >= lc->region_count) 734 return 0; 735 736 do { 737 *region = ext2_find_next_zero_bit( 738 (unsigned long *) lc->sync_bits, 739 lc->region_count, 740 lc->sync_search); 741 lc->sync_search = *region + 1; 742 743 if (*region >= lc->region_count) 744 return 0; 745 746 } while (log_test_bit(lc->recovering_bits, *region)); 747 748 log_set_bit(lc, lc->recovering_bits, *region); 749 return 1; 750} 751 752static void core_set_region_sync(struct dm_dirty_log *log, region_t region, 753 int in_sync) 754{ 755 struct log_c *lc = (struct log_c *) log->context; 756 757 log_clear_bit(lc, lc->recovering_bits, region); 758 if (in_sync) { 759 log_set_bit(lc, lc->sync_bits, region); 760 lc->sync_count++; 761 } else if (log_test_bit(lc->sync_bits, region)) { 762 lc->sync_count--; 763 log_clear_bit(lc, lc->sync_bits, region); 764 } 765} 766 767static region_t core_get_sync_count(struct dm_dirty_log *log) 768{ 769 struct log_c *lc = (struct log_c *) log->context; 770 771 return lc->sync_count; 772} 773 774#define DMEMIT_SYNC \ 775 if (lc->sync != DEFAULTSYNC) \ 776 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") 777 778static int core_status(struct dm_dirty_log *log, status_type_t status, 779 char *result, unsigned int maxlen) 780{ 781 int sz = 0; 782 struct log_c *lc = log->context; 783 784 switch(status) { 785 case STATUSTYPE_INFO: 786 DMEMIT("1 %s", log->type->name); 787 break; 788 789 case STATUSTYPE_TABLE: 790 DMEMIT("%s %u %u ", log->type->name, 791 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); 792 DMEMIT_SYNC; 793 } 794 795 return sz; 796} 797 798static int disk_status(struct dm_dirty_log *log, status_type_t status, 799 char *result, unsigned int maxlen) 800{ 801 int sz = 0; 802 struct log_c *lc = log->context; 803 804 switch(status) { 805 case STATUSTYPE_INFO: 806 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, 807 lc->log_dev_flush_failed ? 'F' : 808 lc->log_dev_failed ? 'D' : 809 'A'); 810 break; 811 812 case STATUSTYPE_TABLE: 813 DMEMIT("%s %u %s %u ", log->type->name, 814 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, 815 lc->region_size); 816 DMEMIT_SYNC; 817 } 818 819 return sz; 820} 821 822static struct dm_dirty_log_type _core_type = { 823 .name = "core", 824 .module = THIS_MODULE, 825 .ctr = core_ctr, 826 .dtr = core_dtr, 827 .resume = core_resume, 828 .get_region_size = core_get_region_size, 829 .is_clean = core_is_clean, 830 .in_sync = core_in_sync, 831 .flush = core_flush, 832 .mark_region = core_mark_region, 833 .clear_region = core_clear_region, 834 .get_resync_work = core_get_resync_work, 835 .set_region_sync = core_set_region_sync, 836 .get_sync_count = core_get_sync_count, 837 .status = core_status, 838}; 839 840static struct dm_dirty_log_type _disk_type = { 841 .name = "disk", 842 .module = THIS_MODULE, 843 .ctr = disk_ctr, 844 .dtr = disk_dtr, 845 .postsuspend = disk_flush, 846 .resume = disk_resume, 847 .get_region_size = core_get_region_size, 848 .is_clean = core_is_clean, 849 .in_sync = core_in_sync, 850 .flush = disk_flush, 851 .mark_region = core_mark_region, 852 .clear_region = core_clear_region, 853 .get_resync_work = core_get_resync_work, 854 .set_region_sync = core_set_region_sync, 855 .get_sync_count = core_get_sync_count, 856 .status = disk_status, 857}; 858 859static int __init dm_dirty_log_init(void) 860{ 861 int r; 862 863 r = dm_dirty_log_type_register(&_core_type); 864 if (r) 865 DMWARN("couldn't register core log"); 866 867 r = dm_dirty_log_type_register(&_disk_type); 868 if (r) { 869 DMWARN("couldn't register disk type"); 870 dm_dirty_log_type_unregister(&_core_type); 871 } 872 873 return r; 874} 875 876static void __exit dm_dirty_log_exit(void) 877{ 878 dm_dirty_log_type_unregister(&_disk_type); 879 dm_dirty_log_type_unregister(&_core_type); 880} 881 882module_init(dm_dirty_log_init); 883module_exit(dm_dirty_log_exit); 884 885MODULE_DESCRIPTION(DM_NAME " dirty region log"); 886MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); 887MODULE_LICENSE("GPL"); 888