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 19 static LIST_HEAD(_log_types); 20 static DEFINE_SPINLOCK(_lock); 21 22 static 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 33 static 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 */ 65 static 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 } 99 100 static 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); 110 111 out: 112 spin_unlock(&_lock); 113 } 114 115 int 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 } 128 EXPORT_SYMBOL(dm_dirty_log_type_register); 129 130 int 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 } 145 EXPORT_SYMBOL(dm_dirty_log_type_unregister); 146 147 struct 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 } 175 EXPORT_SYMBOL(dm_dirty_log_create); 176 177 void dm_dirty_log_destroy(struct dm_dirty_log *log) 178 { 179 log->type->dtr(log); 180 put_type(log->type); 181 kfree(log); 182 } 183 EXPORT_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 2 199 200 struct log_header { 201 uint32_t magic; 202 203 /* 204 * Simple, incrementing version. no backward 205 * compatibility. 206 */ 207 uint32_t version; 208 sector_t nr_regions; 209 }; 210 211 struct log_c { 212 struct dm_target *ti; 213 int touched_dirtied; 214 int touched_cleaned; 215 int flush_failed; 216 uint32_t region_size; 217 unsigned int region_count; 218 region_t sync_count; 219 220 unsigned bitset_uint32_count; 221 uint32_t *clean_bits; 222 uint32_t *sync_bits; 223 uint32_t *recovering_bits; /* FIXME: this seems excessive */ 224 225 int sync_search; 226 227 /* Resync flag */ 228 enum sync { 229 DEFAULTSYNC, /* Synchronize if necessary */ 230 NOSYNC, /* Devices known to be already in sync */ 231 FORCESYNC, /* Force a sync to happen */ 232 } sync; 233 234 struct dm_io_request io_req; 235 236 /* 237 * Disk log fields 238 */ 239 int log_dev_failed; 240 int log_dev_flush_failed; 241 struct dm_dev *log_dev; 242 struct log_header header; 243 244 struct dm_io_region header_location; 245 struct log_header *disk_header; 246 }; 247 248 /* 249 * The touched member needs to be updated every time we access 250 * one of the bitsets. 251 */ 252 static inline int log_test_bit(uint32_t *bs, unsigned bit) 253 { 254 return test_bit_le(bit, (unsigned long *) bs) ? 1 : 0; 255 } 256 257 static inline void log_set_bit(struct log_c *l, 258 uint32_t *bs, unsigned bit) 259 { 260 __test_and_set_bit_le(bit, (unsigned long *) bs); 261 l->touched_cleaned = 1; 262 } 263 264 static inline void log_clear_bit(struct log_c *l, 265 uint32_t *bs, unsigned bit) 266 { 267 __test_and_clear_bit_le(bit, (unsigned long *) bs); 268 l->touched_dirtied = 1; 269 } 270 271 /*---------------------------------------------------------------- 272 * Header IO 273 *--------------------------------------------------------------*/ 274 static void header_to_disk(struct log_header *core, struct log_header *disk) 275 { 276 disk->magic = cpu_to_le32(core->magic); 277 disk->version = cpu_to_le32(core->version); 278 disk->nr_regions = cpu_to_le64(core->nr_regions); 279 } 280 281 static void header_from_disk(struct log_header *core, struct log_header *disk) 282 { 283 core->magic = le32_to_cpu(disk->magic); 284 core->version = le32_to_cpu(disk->version); 285 core->nr_regions = le64_to_cpu(disk->nr_regions); 286 } 287 288 static int rw_header(struct log_c *lc, int rw) 289 { 290 lc->io_req.bi_rw = rw; 291 292 return dm_io(&lc->io_req, 1, &lc->header_location, NULL); 293 } 294 295 static int flush_header(struct log_c *lc) 296 { 297 struct dm_io_region null_location = { 298 .bdev = lc->header_location.bdev, 299 .sector = 0, 300 .count = 0, 301 }; 302 303 lc->io_req.bi_rw = WRITE_FLUSH; 304 305 return dm_io(&lc->io_req, 1, &null_location, NULL); 306 } 307 308 static int read_header(struct log_c *log) 309 { 310 int r; 311 312 r = rw_header(log, READ); 313 if (r) 314 return r; 315 316 header_from_disk(&log->header, log->disk_header); 317 318 /* New log required? */ 319 if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { 320 log->header.magic = MIRROR_MAGIC; 321 log->header.version = MIRROR_DISK_VERSION; 322 log->header.nr_regions = 0; 323 } 324 325 #ifdef __LITTLE_ENDIAN 326 if (log->header.version == 1) 327 log->header.version = 2; 328 #endif 329 330 if (log->header.version != MIRROR_DISK_VERSION) { 331 DMWARN("incompatible disk log version"); 332 return -EINVAL; 333 } 334 335 return 0; 336 } 337 338 static int _check_region_size(struct dm_target *ti, uint32_t region_size) 339 { 340 if (region_size < 2 || region_size > ti->len) 341 return 0; 342 343 if (!is_power_of_2(region_size)) 344 return 0; 345 346 return 1; 347 } 348 349 /*---------------------------------------------------------------- 350 * core log constructor/destructor 351 * 352 * argv contains region_size followed optionally by [no]sync 353 *--------------------------------------------------------------*/ 354 #define BYTE_SHIFT 3 355 static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, 356 unsigned int argc, char **argv, 357 struct dm_dev *dev) 358 { 359 enum sync sync = DEFAULTSYNC; 360 361 struct log_c *lc; 362 uint32_t region_size; 363 unsigned int region_count; 364 size_t bitset_size, buf_size; 365 int r; 366 367 if (argc < 1 || argc > 2) { 368 DMWARN("wrong number of arguments to dirty region log"); 369 return -EINVAL; 370 } 371 372 if (argc > 1) { 373 if (!strcmp(argv[1], "sync")) 374 sync = FORCESYNC; 375 else if (!strcmp(argv[1], "nosync")) 376 sync = NOSYNC; 377 else { 378 DMWARN("unrecognised sync argument to " 379 "dirty region log: %s", argv[1]); 380 return -EINVAL; 381 } 382 } 383 384 if (sscanf(argv[0], "%u", ®ion_size) != 1 || 385 !_check_region_size(ti, region_size)) { 386 DMWARN("invalid region size %s", argv[0]); 387 return -EINVAL; 388 } 389 390 region_count = dm_sector_div_up(ti->len, region_size); 391 392 lc = kmalloc(sizeof(*lc), GFP_KERNEL); 393 if (!lc) { 394 DMWARN("couldn't allocate core log"); 395 return -ENOMEM; 396 } 397 398 lc->ti = ti; 399 lc->touched_dirtied = 0; 400 lc->touched_cleaned = 0; 401 lc->flush_failed = 0; 402 lc->region_size = region_size; 403 lc->region_count = region_count; 404 lc->sync = sync; 405 406 /* 407 * Work out how many "unsigned long"s we need to hold the bitset. 408 */ 409 bitset_size = dm_round_up(region_count, 410 sizeof(*lc->clean_bits) << BYTE_SHIFT); 411 bitset_size >>= BYTE_SHIFT; 412 413 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); 414 415 /* 416 * Disk log? 417 */ 418 if (!dev) { 419 lc->clean_bits = vmalloc(bitset_size); 420 if (!lc->clean_bits) { 421 DMWARN("couldn't allocate clean bitset"); 422 kfree(lc); 423 return -ENOMEM; 424 } 425 lc->disk_header = NULL; 426 } else { 427 lc->log_dev = dev; 428 lc->log_dev_failed = 0; 429 lc->log_dev_flush_failed = 0; 430 lc->header_location.bdev = lc->log_dev->bdev; 431 lc->header_location.sector = 0; 432 433 /* 434 * Buffer holds both header and bitset. 435 */ 436 buf_size = 437 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, 438 bdev_logical_block_size(lc->header_location. 439 bdev)); 440 441 if (buf_size > i_size_read(dev->bdev->bd_inode)) { 442 DMWARN("log device %s too small: need %llu bytes", 443 dev->name, (unsigned long long)buf_size); 444 kfree(lc); 445 return -EINVAL; 446 } 447 448 lc->header_location.count = buf_size >> SECTOR_SHIFT; 449 450 lc->io_req.mem.type = DM_IO_VMA; 451 lc->io_req.notify.fn = NULL; 452 lc->io_req.client = dm_io_client_create(); 453 if (IS_ERR(lc->io_req.client)) { 454 r = PTR_ERR(lc->io_req.client); 455 DMWARN("couldn't allocate disk io client"); 456 kfree(lc); 457 return r; 458 } 459 460 lc->disk_header = vmalloc(buf_size); 461 if (!lc->disk_header) { 462 DMWARN("couldn't allocate disk log buffer"); 463 dm_io_client_destroy(lc->io_req.client); 464 kfree(lc); 465 return -ENOMEM; 466 } 467 468 lc->io_req.mem.ptr.vma = lc->disk_header; 469 lc->clean_bits = (void *)lc->disk_header + 470 (LOG_OFFSET << SECTOR_SHIFT); 471 } 472 473 memset(lc->clean_bits, -1, bitset_size); 474 475 lc->sync_bits = vmalloc(bitset_size); 476 if (!lc->sync_bits) { 477 DMWARN("couldn't allocate sync bitset"); 478 if (!dev) 479 vfree(lc->clean_bits); 480 else 481 dm_io_client_destroy(lc->io_req.client); 482 vfree(lc->disk_header); 483 kfree(lc); 484 return -ENOMEM; 485 } 486 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); 487 lc->sync_count = (sync == NOSYNC) ? region_count : 0; 488 489 lc->recovering_bits = vmalloc(bitset_size); 490 if (!lc->recovering_bits) { 491 DMWARN("couldn't allocate sync bitset"); 492 vfree(lc->sync_bits); 493 if (!dev) 494 vfree(lc->clean_bits); 495 else 496 dm_io_client_destroy(lc->io_req.client); 497 vfree(lc->disk_header); 498 kfree(lc); 499 return -ENOMEM; 500 } 501 memset(lc->recovering_bits, 0, bitset_size); 502 lc->sync_search = 0; 503 log->context = lc; 504 505 return 0; 506 } 507 508 static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, 509 unsigned int argc, char **argv) 510 { 511 return create_log_context(log, ti, argc, argv, NULL); 512 } 513 514 static void destroy_log_context(struct log_c *lc) 515 { 516 vfree(lc->sync_bits); 517 vfree(lc->recovering_bits); 518 kfree(lc); 519 } 520 521 static void core_dtr(struct dm_dirty_log *log) 522 { 523 struct log_c *lc = (struct log_c *) log->context; 524 525 vfree(lc->clean_bits); 526 destroy_log_context(lc); 527 } 528 529 /*---------------------------------------------------------------- 530 * disk log constructor/destructor 531 * 532 * argv contains log_device region_size followed optionally by [no]sync 533 *--------------------------------------------------------------*/ 534 static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, 535 unsigned int argc, char **argv) 536 { 537 int r; 538 struct dm_dev *dev; 539 540 if (argc < 2 || argc > 3) { 541 DMWARN("wrong number of arguments to disk dirty region log"); 542 return -EINVAL; 543 } 544 545 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); 546 if (r) 547 return r; 548 549 r = create_log_context(log, ti, argc - 1, argv + 1, dev); 550 if (r) { 551 dm_put_device(ti, dev); 552 return r; 553 } 554 555 return 0; 556 } 557 558 static void disk_dtr(struct dm_dirty_log *log) 559 { 560 struct log_c *lc = (struct log_c *) log->context; 561 562 dm_put_device(lc->ti, lc->log_dev); 563 vfree(lc->disk_header); 564 dm_io_client_destroy(lc->io_req.client); 565 destroy_log_context(lc); 566 } 567 568 static int count_bits32(uint32_t *addr, unsigned size) 569 { 570 int count = 0, i; 571 572 for (i = 0; i < size; i++) { 573 count += hweight32(*(addr+i)); 574 } 575 return count; 576 } 577 578 static void fail_log_device(struct log_c *lc) 579 { 580 if (lc->log_dev_failed) 581 return; 582 583 lc->log_dev_failed = 1; 584 dm_table_event(lc->ti->table); 585 } 586 587 static int disk_resume(struct dm_dirty_log *log) 588 { 589 int r; 590 unsigned i; 591 struct log_c *lc = (struct log_c *) log->context; 592 size_t size = lc->bitset_uint32_count * sizeof(uint32_t); 593 594 /* read the disk header */ 595 r = read_header(lc); 596 if (r) { 597 DMWARN("%s: Failed to read header on dirty region log device", 598 lc->log_dev->name); 599 fail_log_device(lc); 600 /* 601 * If the log device cannot be read, we must assume 602 * all regions are out-of-sync. If we simply return 603 * here, the state will be uninitialized and could 604 * lead us to return 'in-sync' status for regions 605 * that are actually 'out-of-sync'. 606 */ 607 lc->header.nr_regions = 0; 608 } 609 610 /* set or clear any new bits -- device has grown */ 611 if (lc->sync == NOSYNC) 612 for (i = lc->header.nr_regions; i < lc->region_count; i++) 613 /* FIXME: amazingly inefficient */ 614 log_set_bit(lc, lc->clean_bits, i); 615 else 616 for (i = lc->header.nr_regions; i < lc->region_count; i++) 617 /* FIXME: amazingly inefficient */ 618 log_clear_bit(lc, lc->clean_bits, i); 619 620 /* clear any old bits -- device has shrunk */ 621 for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) 622 log_clear_bit(lc, lc->clean_bits, i); 623 624 /* copy clean across to sync */ 625 memcpy(lc->sync_bits, lc->clean_bits, size); 626 lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); 627 lc->sync_search = 0; 628 629 /* set the correct number of regions in the header */ 630 lc->header.nr_regions = lc->region_count; 631 632 header_to_disk(&lc->header, lc->disk_header); 633 634 /* write the new header */ 635 r = rw_header(lc, WRITE); 636 if (!r) { 637 r = flush_header(lc); 638 if (r) 639 lc->log_dev_flush_failed = 1; 640 } 641 if (r) { 642 DMWARN("%s: Failed to write header on dirty region log device", 643 lc->log_dev->name); 644 fail_log_device(lc); 645 } 646 647 return r; 648 } 649 650 static uint32_t core_get_region_size(struct dm_dirty_log *log) 651 { 652 struct log_c *lc = (struct log_c *) log->context; 653 return lc->region_size; 654 } 655 656 static int core_resume(struct dm_dirty_log *log) 657 { 658 struct log_c *lc = (struct log_c *) log->context; 659 lc->sync_search = 0; 660 return 0; 661 } 662 663 static int core_is_clean(struct dm_dirty_log *log, region_t region) 664 { 665 struct log_c *lc = (struct log_c *) log->context; 666 return log_test_bit(lc->clean_bits, region); 667 } 668 669 static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) 670 { 671 struct log_c *lc = (struct log_c *) log->context; 672 return log_test_bit(lc->sync_bits, region); 673 } 674 675 static int core_flush(struct dm_dirty_log *log) 676 { 677 /* no op */ 678 return 0; 679 } 680 681 static int disk_flush(struct dm_dirty_log *log) 682 { 683 int r, i; 684 struct log_c *lc = log->context; 685 686 /* only write if the log has changed */ 687 if (!lc->touched_cleaned && !lc->touched_dirtied) 688 return 0; 689 690 if (lc->touched_cleaned && log->flush_callback_fn && 691 log->flush_callback_fn(lc->ti)) { 692 /* 693 * At this point it is impossible to determine which 694 * regions are clean and which are dirty (without 695 * re-reading the log off disk). So mark all of them 696 * dirty. 697 */ 698 lc->flush_failed = 1; 699 for (i = 0; i < lc->region_count; i++) 700 log_clear_bit(lc, lc->clean_bits, i); 701 } 702 703 r = rw_header(lc, WRITE); 704 if (r) 705 fail_log_device(lc); 706 else { 707 if (lc->touched_dirtied) { 708 r = flush_header(lc); 709 if (r) { 710 lc->log_dev_flush_failed = 1; 711 fail_log_device(lc); 712 } else 713 lc->touched_dirtied = 0; 714 } 715 lc->touched_cleaned = 0; 716 } 717 718 return r; 719 } 720 721 static void core_mark_region(struct dm_dirty_log *log, region_t region) 722 { 723 struct log_c *lc = (struct log_c *) log->context; 724 log_clear_bit(lc, lc->clean_bits, region); 725 } 726 727 static void core_clear_region(struct dm_dirty_log *log, region_t region) 728 { 729 struct log_c *lc = (struct log_c *) log->context; 730 if (likely(!lc->flush_failed)) 731 log_set_bit(lc, lc->clean_bits, region); 732 } 733 734 static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) 735 { 736 struct log_c *lc = (struct log_c *) log->context; 737 738 if (lc->sync_search >= lc->region_count) 739 return 0; 740 741 do { 742 *region = find_next_zero_bit_le( 743 (unsigned long *) lc->sync_bits, 744 lc->region_count, 745 lc->sync_search); 746 lc->sync_search = *region + 1; 747 748 if (*region >= lc->region_count) 749 return 0; 750 751 } while (log_test_bit(lc->recovering_bits, *region)); 752 753 log_set_bit(lc, lc->recovering_bits, *region); 754 return 1; 755 } 756 757 static void core_set_region_sync(struct dm_dirty_log *log, region_t region, 758 int in_sync) 759 { 760 struct log_c *lc = (struct log_c *) log->context; 761 762 log_clear_bit(lc, lc->recovering_bits, region); 763 if (in_sync) { 764 log_set_bit(lc, lc->sync_bits, region); 765 lc->sync_count++; 766 } else if (log_test_bit(lc->sync_bits, region)) { 767 lc->sync_count--; 768 log_clear_bit(lc, lc->sync_bits, region); 769 } 770 } 771 772 static region_t core_get_sync_count(struct dm_dirty_log *log) 773 { 774 struct log_c *lc = (struct log_c *) log->context; 775 776 return lc->sync_count; 777 } 778 779 #define DMEMIT_SYNC \ 780 if (lc->sync != DEFAULTSYNC) \ 781 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") 782 783 static int core_status(struct dm_dirty_log *log, status_type_t status, 784 char *result, unsigned int maxlen) 785 { 786 int sz = 0; 787 struct log_c *lc = log->context; 788 789 switch(status) { 790 case STATUSTYPE_INFO: 791 DMEMIT("1 %s", log->type->name); 792 break; 793 794 case STATUSTYPE_TABLE: 795 DMEMIT("%s %u %u ", log->type->name, 796 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); 797 DMEMIT_SYNC; 798 } 799 800 return sz; 801 } 802 803 static int disk_status(struct dm_dirty_log *log, status_type_t status, 804 char *result, unsigned int maxlen) 805 { 806 int sz = 0; 807 struct log_c *lc = log->context; 808 809 switch(status) { 810 case STATUSTYPE_INFO: 811 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, 812 lc->log_dev_flush_failed ? 'F' : 813 lc->log_dev_failed ? 'D' : 814 'A'); 815 break; 816 817 case STATUSTYPE_TABLE: 818 DMEMIT("%s %u %s %u ", log->type->name, 819 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, 820 lc->region_size); 821 DMEMIT_SYNC; 822 } 823 824 return sz; 825 } 826 827 static struct dm_dirty_log_type _core_type = { 828 .name = "core", 829 .module = THIS_MODULE, 830 .ctr = core_ctr, 831 .dtr = core_dtr, 832 .resume = core_resume, 833 .get_region_size = core_get_region_size, 834 .is_clean = core_is_clean, 835 .in_sync = core_in_sync, 836 .flush = core_flush, 837 .mark_region = core_mark_region, 838 .clear_region = core_clear_region, 839 .get_resync_work = core_get_resync_work, 840 .set_region_sync = core_set_region_sync, 841 .get_sync_count = core_get_sync_count, 842 .status = core_status, 843 }; 844 845 static struct dm_dirty_log_type _disk_type = { 846 .name = "disk", 847 .module = THIS_MODULE, 848 .ctr = disk_ctr, 849 .dtr = disk_dtr, 850 .postsuspend = disk_flush, 851 .resume = disk_resume, 852 .get_region_size = core_get_region_size, 853 .is_clean = core_is_clean, 854 .in_sync = core_in_sync, 855 .flush = disk_flush, 856 .mark_region = core_mark_region, 857 .clear_region = core_clear_region, 858 .get_resync_work = core_get_resync_work, 859 .set_region_sync = core_set_region_sync, 860 .get_sync_count = core_get_sync_count, 861 .status = disk_status, 862 }; 863 864 static int __init dm_dirty_log_init(void) 865 { 866 int r; 867 868 r = dm_dirty_log_type_register(&_core_type); 869 if (r) 870 DMWARN("couldn't register core log"); 871 872 r = dm_dirty_log_type_register(&_disk_type); 873 if (r) { 874 DMWARN("couldn't register disk type"); 875 dm_dirty_log_type_unregister(&_core_type); 876 } 877 878 return r; 879 } 880 881 static void __exit dm_dirty_log_exit(void) 882 { 883 dm_dirty_log_type_unregister(&_disk_type); 884 dm_dirty_log_type_unregister(&_core_type); 885 } 886 887 module_init(dm_dirty_log_init); 888 module_exit(dm_dirty_log_exit); 889 890 MODULE_DESCRIPTION(DM_NAME " dirty region log"); 891 MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); 892 MODULE_LICENSE("GPL"); 893