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 op) 295{ 296 lc->io_req.bi_op = op; 297 lc->io_req.bi_op_flags = 0; 298 299 return dm_io(&lc->io_req, 1, &lc->header_location, NULL); 300} 301 302static int flush_header(struct log_c *lc) 303{ 304 struct dm_io_region null_location = { 305 .bdev = lc->header_location.bdev, 306 .sector = 0, 307 .count = 0, 308 }; 309 310 lc->io_req.bi_op = REQ_OP_WRITE; 311 lc->io_req.bi_op_flags = REQ_PREFLUSH; 312 313 return dm_io(&lc->io_req, 1, &null_location, NULL); 314} 315 316static int read_header(struct log_c *log) 317{ 318 int r; 319 320 r = rw_header(log, REQ_OP_READ); 321 if (r) 322 return r; 323 324 header_from_disk(&log->header, log->disk_header); 325 326 /* New log required? */ 327 if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { 328 log->header.magic = MIRROR_MAGIC; 329 log->header.version = MIRROR_DISK_VERSION; 330 log->header.nr_regions = 0; 331 } 332 333#ifdef __LITTLE_ENDIAN 334 if (log->header.version == 1) 335 log->header.version = 2; 336#endif 337 338 if (log->header.version != MIRROR_DISK_VERSION) { 339 DMWARN("incompatible disk log version"); 340 return -EINVAL; 341 } 342 343 return 0; 344} 345 346static int _check_region_size(struct dm_target *ti, uint32_t region_size) 347{ 348 if (region_size < 2 || region_size > ti->len) 349 return 0; 350 351 if (!is_power_of_2(region_size)) 352 return 0; 353 354 return 1; 355} 356 357/*---------------------------------------------------------------- 358 * core log constructor/destructor 359 * 360 * argv contains region_size followed optionally by [no]sync 361 *--------------------------------------------------------------*/ 362#define BYTE_SHIFT 3 363static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, 364 unsigned int argc, char **argv, 365 struct dm_dev *dev) 366{ 367 enum sync sync = DEFAULTSYNC; 368 369 struct log_c *lc; 370 uint32_t region_size; 371 unsigned int region_count; 372 size_t bitset_size, buf_size; 373 int r; 374 char dummy; 375 376 if (argc < 1 || argc > 2) { 377 DMWARN("wrong number of arguments to dirty region log"); 378 return -EINVAL; 379 } 380 381 if (argc > 1) { 382 if (!strcmp(argv[1], "sync")) 383 sync = FORCESYNC; 384 else if (!strcmp(argv[1], "nosync")) 385 sync = NOSYNC; 386 else { 387 DMWARN("unrecognised sync argument to " 388 "dirty region log: %s", argv[1]); 389 return -EINVAL; 390 } 391 } 392 393 if (sscanf(argv[0], "%u%c", ®ion_size, &dummy) != 1 || 394 !_check_region_size(ti, region_size)) { 395 DMWARN("invalid region size %s", argv[0]); 396 return -EINVAL; 397 } 398 399 region_count = dm_sector_div_up(ti->len, region_size); 400 401 lc = kmalloc(sizeof(*lc), GFP_KERNEL); 402 if (!lc) { 403 DMWARN("couldn't allocate core log"); 404 return -ENOMEM; 405 } 406 407 lc->ti = ti; 408 lc->touched_dirtied = 0; 409 lc->touched_cleaned = 0; 410 lc->flush_failed = 0; 411 lc->region_size = region_size; 412 lc->region_count = region_count; 413 lc->sync = sync; 414 415 /* 416 * Work out how many "unsigned long"s we need to hold the bitset. 417 */ 418 bitset_size = dm_round_up(region_count, BITS_PER_LONG); 419 bitset_size >>= BYTE_SHIFT; 420 421 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); 422 423 /* 424 * Disk log? 425 */ 426 if (!dev) { 427 lc->clean_bits = vmalloc(bitset_size); 428 if (!lc->clean_bits) { 429 DMWARN("couldn't allocate clean bitset"); 430 kfree(lc); 431 return -ENOMEM; 432 } 433 lc->disk_header = NULL; 434 } else { 435 lc->log_dev = dev; 436 lc->log_dev_failed = 0; 437 lc->log_dev_flush_failed = 0; 438 lc->header_location.bdev = lc->log_dev->bdev; 439 lc->header_location.sector = 0; 440 441 /* 442 * Buffer holds both header and bitset. 443 */ 444 buf_size = 445 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, 446 bdev_logical_block_size(lc->header_location. 447 bdev)); 448 449 if (buf_size > i_size_read(dev->bdev->bd_inode)) { 450 DMWARN("log device %s too small: need %llu bytes", 451 dev->name, (unsigned long long)buf_size); 452 kfree(lc); 453 return -EINVAL; 454 } 455 456 lc->header_location.count = buf_size >> SECTOR_SHIFT; 457 458 lc->io_req.mem.type = DM_IO_VMA; 459 lc->io_req.notify.fn = NULL; 460 lc->io_req.client = dm_io_client_create(); 461 if (IS_ERR(lc->io_req.client)) { 462 r = PTR_ERR(lc->io_req.client); 463 DMWARN("couldn't allocate disk io client"); 464 kfree(lc); 465 return r; 466 } 467 468 lc->disk_header = vmalloc(buf_size); 469 if (!lc->disk_header) { 470 DMWARN("couldn't allocate disk log buffer"); 471 dm_io_client_destroy(lc->io_req.client); 472 kfree(lc); 473 return -ENOMEM; 474 } 475 476 lc->io_req.mem.ptr.vma = lc->disk_header; 477 lc->clean_bits = (void *)lc->disk_header + 478 (LOG_OFFSET << SECTOR_SHIFT); 479 } 480 481 memset(lc->clean_bits, -1, bitset_size); 482 483 lc->sync_bits = vmalloc(bitset_size); 484 if (!lc->sync_bits) { 485 DMWARN("couldn't allocate sync bitset"); 486 if (!dev) 487 vfree(lc->clean_bits); 488 else 489 dm_io_client_destroy(lc->io_req.client); 490 vfree(lc->disk_header); 491 kfree(lc); 492 return -ENOMEM; 493 } 494 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); 495 lc->sync_count = (sync == NOSYNC) ? region_count : 0; 496 497 lc->recovering_bits = vzalloc(bitset_size); 498 if (!lc->recovering_bits) { 499 DMWARN("couldn't allocate sync bitset"); 500 vfree(lc->sync_bits); 501 if (!dev) 502 vfree(lc->clean_bits); 503 else 504 dm_io_client_destroy(lc->io_req.client); 505 vfree(lc->disk_header); 506 kfree(lc); 507 return -ENOMEM; 508 } 509 lc->sync_search = 0; 510 log->context = lc; 511 512 return 0; 513} 514 515static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, 516 unsigned int argc, char **argv) 517{ 518 return create_log_context(log, ti, argc, argv, NULL); 519} 520 521static void destroy_log_context(struct log_c *lc) 522{ 523 vfree(lc->sync_bits); 524 vfree(lc->recovering_bits); 525 kfree(lc); 526} 527 528static void core_dtr(struct dm_dirty_log *log) 529{ 530 struct log_c *lc = (struct log_c *) log->context; 531 532 vfree(lc->clean_bits); 533 destroy_log_context(lc); 534} 535 536/*---------------------------------------------------------------- 537 * disk log constructor/destructor 538 * 539 * argv contains log_device region_size followed optionally by [no]sync 540 *--------------------------------------------------------------*/ 541static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, 542 unsigned int argc, char **argv) 543{ 544 int r; 545 struct dm_dev *dev; 546 547 if (argc < 2 || argc > 3) { 548 DMWARN("wrong number of arguments to disk dirty region log"); 549 return -EINVAL; 550 } 551 552 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); 553 if (r) 554 return r; 555 556 r = create_log_context(log, ti, argc - 1, argv + 1, dev); 557 if (r) { 558 dm_put_device(ti, dev); 559 return r; 560 } 561 562 return 0; 563} 564 565static void disk_dtr(struct dm_dirty_log *log) 566{ 567 struct log_c *lc = (struct log_c *) log->context; 568 569 dm_put_device(lc->ti, lc->log_dev); 570 vfree(lc->disk_header); 571 dm_io_client_destroy(lc->io_req.client); 572 destroy_log_context(lc); 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 /* FIXME: amazingly inefficient */ 611 log_set_bit(lc, lc->clean_bits, i); 612 else 613 for (i = lc->header.nr_regions; i < lc->region_count; i++) 614 /* FIXME: amazingly inefficient */ 615 log_clear_bit(lc, lc->clean_bits, i); 616 617 /* clear any old bits -- device has shrunk */ 618 for (i = lc->region_count; i % BITS_PER_LONG; i++) 619 log_clear_bit(lc, lc->clean_bits, i); 620 621 /* copy clean across to sync */ 622 memcpy(lc->sync_bits, lc->clean_bits, size); 623 lc->sync_count = memweight(lc->clean_bits, 624 lc->bitset_uint32_count * sizeof(uint32_t)); 625 lc->sync_search = 0; 626 627 /* set the correct number of regions in the header */ 628 lc->header.nr_regions = lc->region_count; 629 630 header_to_disk(&lc->header, lc->disk_header); 631 632 /* write the new header */ 633 r = rw_header(lc, REQ_OP_WRITE); 634 if (!r) { 635 r = flush_header(lc); 636 if (r) 637 lc->log_dev_flush_failed = 1; 638 } 639 if (r) { 640 DMWARN("%s: Failed to write header on dirty region log device", 641 lc->log_dev->name); 642 fail_log_device(lc); 643 } 644 645 return r; 646} 647 648static uint32_t core_get_region_size(struct dm_dirty_log *log) 649{ 650 struct log_c *lc = (struct log_c *) log->context; 651 return lc->region_size; 652} 653 654static int core_resume(struct dm_dirty_log *log) 655{ 656 struct log_c *lc = (struct log_c *) log->context; 657 lc->sync_search = 0; 658 return 0; 659} 660 661static int core_is_clean(struct dm_dirty_log *log, region_t region) 662{ 663 struct log_c *lc = (struct log_c *) log->context; 664 return log_test_bit(lc->clean_bits, region); 665} 666 667static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) 668{ 669 struct log_c *lc = (struct log_c *) log->context; 670 return log_test_bit(lc->sync_bits, region); 671} 672 673static int core_flush(struct dm_dirty_log *log) 674{ 675 /* no op */ 676 return 0; 677} 678 679static int disk_flush(struct dm_dirty_log *log) 680{ 681 int r, i; 682 struct log_c *lc = log->context; 683 684 /* only write if the log has changed */ 685 if (!lc->touched_cleaned && !lc->touched_dirtied) 686 return 0; 687 688 if (lc->touched_cleaned && log->flush_callback_fn && 689 log->flush_callback_fn(lc->ti)) { 690 /* 691 * At this point it is impossible to determine which 692 * regions are clean and which are dirty (without 693 * re-reading the log off disk). So mark all of them 694 * dirty. 695 */ 696 lc->flush_failed = 1; 697 for (i = 0; i < lc->region_count; i++) 698 log_clear_bit(lc, lc->clean_bits, i); 699 } 700 701 r = rw_header(lc, REQ_OP_WRITE); 702 if (r) 703 fail_log_device(lc); 704 else { 705 if (lc->touched_dirtied) { 706 r = flush_header(lc); 707 if (r) { 708 lc->log_dev_flush_failed = 1; 709 fail_log_device(lc); 710 } else 711 lc->touched_dirtied = 0; 712 } 713 lc->touched_cleaned = 0; 714 } 715 716 return r; 717} 718 719static void core_mark_region(struct dm_dirty_log *log, region_t region) 720{ 721 struct log_c *lc = (struct log_c *) log->context; 722 log_clear_bit(lc, lc->clean_bits, region); 723} 724 725static void core_clear_region(struct dm_dirty_log *log, region_t region) 726{ 727 struct log_c *lc = (struct log_c *) log->context; 728 if (likely(!lc->flush_failed)) 729 log_set_bit(lc, lc->clean_bits, region); 730} 731 732static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) 733{ 734 struct log_c *lc = (struct log_c *) log->context; 735 736 if (lc->sync_search >= lc->region_count) 737 return 0; 738 739 do { 740 *region = find_next_zero_bit_le(lc->sync_bits, 741 lc->region_count, 742 lc->sync_search); 743 lc->sync_search = *region + 1; 744 745 if (*region >= lc->region_count) 746 return 0; 747 748 } while (log_test_bit(lc->recovering_bits, *region)); 749 750 log_set_bit(lc, lc->recovering_bits, *region); 751 return 1; 752} 753 754static void core_set_region_sync(struct dm_dirty_log *log, region_t region, 755 int in_sync) 756{ 757 struct log_c *lc = (struct log_c *) log->context; 758 759 log_clear_bit(lc, lc->recovering_bits, region); 760 if (in_sync) { 761 log_set_bit(lc, lc->sync_bits, region); 762 lc->sync_count++; 763 } else if (log_test_bit(lc->sync_bits, region)) { 764 lc->sync_count--; 765 log_clear_bit(lc, lc->sync_bits, region); 766 } 767} 768 769static region_t core_get_sync_count(struct dm_dirty_log *log) 770{ 771 struct log_c *lc = (struct log_c *) log->context; 772 773 return lc->sync_count; 774} 775 776#define DMEMIT_SYNC \ 777 if (lc->sync != DEFAULTSYNC) \ 778 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") 779 780static int core_status(struct dm_dirty_log *log, status_type_t status, 781 char *result, unsigned int maxlen) 782{ 783 int sz = 0; 784 struct log_c *lc = log->context; 785 786 switch(status) { 787 case STATUSTYPE_INFO: 788 DMEMIT("1 %s", log->type->name); 789 break; 790 791 case STATUSTYPE_TABLE: 792 DMEMIT("%s %u %u ", log->type->name, 793 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); 794 DMEMIT_SYNC; 795 } 796 797 return sz; 798} 799 800static int disk_status(struct dm_dirty_log *log, status_type_t status, 801 char *result, unsigned int maxlen) 802{ 803 int sz = 0; 804 struct log_c *lc = log->context; 805 806 switch(status) { 807 case STATUSTYPE_INFO: 808 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, 809 lc->log_dev_flush_failed ? 'F' : 810 lc->log_dev_failed ? 'D' : 811 'A'); 812 break; 813 814 case STATUSTYPE_TABLE: 815 DMEMIT("%s %u %s %u ", log->type->name, 816 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, 817 lc->region_size); 818 DMEMIT_SYNC; 819 } 820 821 return sz; 822} 823 824static struct dm_dirty_log_type _core_type = { 825 .name = "core", 826 .module = THIS_MODULE, 827 .ctr = core_ctr, 828 .dtr = core_dtr, 829 .resume = core_resume, 830 .get_region_size = core_get_region_size, 831 .is_clean = core_is_clean, 832 .in_sync = core_in_sync, 833 .flush = core_flush, 834 .mark_region = core_mark_region, 835 .clear_region = core_clear_region, 836 .get_resync_work = core_get_resync_work, 837 .set_region_sync = core_set_region_sync, 838 .get_sync_count = core_get_sync_count, 839 .status = core_status, 840}; 841 842static struct dm_dirty_log_type _disk_type = { 843 .name = "disk", 844 .module = THIS_MODULE, 845 .ctr = disk_ctr, 846 .dtr = disk_dtr, 847 .postsuspend = disk_flush, 848 .resume = disk_resume, 849 .get_region_size = core_get_region_size, 850 .is_clean = core_is_clean, 851 .in_sync = core_in_sync, 852 .flush = disk_flush, 853 .mark_region = core_mark_region, 854 .clear_region = core_clear_region, 855 .get_resync_work = core_get_resync_work, 856 .set_region_sync = core_set_region_sync, 857 .get_sync_count = core_get_sync_count, 858 .status = disk_status, 859}; 860 861static int __init dm_dirty_log_init(void) 862{ 863 int r; 864 865 r = dm_dirty_log_type_register(&_core_type); 866 if (r) 867 DMWARN("couldn't register core log"); 868 869 r = dm_dirty_log_type_register(&_disk_type); 870 if (r) { 871 DMWARN("couldn't register disk type"); 872 dm_dirty_log_type_unregister(&_core_type); 873 } 874 875 return r; 876} 877 878static void __exit dm_dirty_log_exit(void) 879{ 880 dm_dirty_log_type_unregister(&_disk_type); 881 dm_dirty_log_type_unregister(&_core_type); 882} 883 884module_init(dm_dirty_log_init); 885module_exit(dm_dirty_log_exit); 886 887MODULE_DESCRIPTION(DM_NAME " dirty region log"); 888MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); 889MODULE_LICENSE("GPL"); 890