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_disk { 201 __le32 magic; 202 203 /* 204 * Simple, incrementing version. no backward 205 * compatibility. 206 */ 207 __le32 version; 208 __le64 nr_regions; 209 } __packed; 210 211 struct log_header_core { 212 uint32_t magic; 213 uint32_t version; 214 uint64_t nr_regions; 215 }; 216 217 struct 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 */ 258 static inline int log_test_bit(uint32_t *bs, unsigned bit) 259 { 260 return test_bit_le(bit, bs) ? 1 : 0; 261 } 262 263 static 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 } 269 270 static 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 *--------------------------------------------------------------*/ 280 static 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 } 286 287 static 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 } 293 294 static 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 } 300 301 static 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 } 313 314 static 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 } 343 344 static 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 3 361 static 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; 372 373 if (argc < 1 || argc > 2) { 374 DMWARN("wrong number of arguments to dirty region log"); 375 return -EINVAL; 376 } 377 378 if (argc > 1) { 379 if (!strcmp(argv[1], "sync")) 380 sync = FORCESYNC; 381 else if (!strcmp(argv[1], "nosync")) 382 sync = NOSYNC; 383 else { 384 DMWARN("unrecognised sync argument to " 385 "dirty region log: %s", argv[1]); 386 return -EINVAL; 387 } 388 } 389 390 if (sscanf(argv[0], "%u", ®ion_size) != 1 || 391 !_check_region_size(ti, region_size)) { 392 DMWARN("invalid region size %s", argv[0]); 393 return -EINVAL; 394 } 395 396 region_count = dm_sector_div_up(ti->len, region_size); 397 398 lc = kmalloc(sizeof(*lc), GFP_KERNEL); 399 if (!lc) { 400 DMWARN("couldn't allocate core log"); 401 return -ENOMEM; 402 } 403 404 lc->ti = ti; 405 lc->touched_dirtied = 0; 406 lc->touched_cleaned = 0; 407 lc->flush_failed = 0; 408 lc->region_size = region_size; 409 lc->region_count = region_count; 410 lc->sync = sync; 411 412 /* 413 * Work out how many "unsigned long"s we need to hold the bitset. 414 */ 415 bitset_size = dm_round_up(region_count, 416 sizeof(*lc->clean_bits) << BYTE_SHIFT); 417 bitset_size >>= BYTE_SHIFT; 418 419 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); 420 421 /* 422 * Disk log? 423 */ 424 if (!dev) { 425 lc->clean_bits = vmalloc(bitset_size); 426 if (!lc->clean_bits) { 427 DMWARN("couldn't allocate clean bitset"); 428 kfree(lc); 429 return -ENOMEM; 430 } 431 lc->disk_header = NULL; 432 } else { 433 lc->log_dev = dev; 434 lc->log_dev_failed = 0; 435 lc->log_dev_flush_failed = 0; 436 lc->header_location.bdev = lc->log_dev->bdev; 437 lc->header_location.sector = 0; 438 439 /* 440 * Buffer holds both header and bitset. 441 */ 442 buf_size = 443 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, 444 bdev_logical_block_size(lc->header_location. 445 bdev)); 446 447 if (buf_size > i_size_read(dev->bdev->bd_inode)) { 448 DMWARN("log device %s too small: need %llu bytes", 449 dev->name, (unsigned long long)buf_size); 450 kfree(lc); 451 return -EINVAL; 452 } 453 454 lc->header_location.count = buf_size >> SECTOR_SHIFT; 455 456 lc->io_req.mem.type = DM_IO_VMA; 457 lc->io_req.notify.fn = NULL; 458 lc->io_req.client = dm_io_client_create(); 459 if (IS_ERR(lc->io_req.client)) { 460 r = PTR_ERR(lc->io_req.client); 461 DMWARN("couldn't allocate disk io client"); 462 kfree(lc); 463 return r; 464 } 465 466 lc->disk_header = vmalloc(buf_size); 467 if (!lc->disk_header) { 468 DMWARN("couldn't allocate disk log buffer"); 469 dm_io_client_destroy(lc->io_req.client); 470 kfree(lc); 471 return -ENOMEM; 472 } 473 474 lc->io_req.mem.ptr.vma = lc->disk_header; 475 lc->clean_bits = (void *)lc->disk_header + 476 (LOG_OFFSET << SECTOR_SHIFT); 477 } 478 479 memset(lc->clean_bits, -1, bitset_size); 480 481 lc->sync_bits = vmalloc(bitset_size); 482 if (!lc->sync_bits) { 483 DMWARN("couldn't allocate sync bitset"); 484 if (!dev) 485 vfree(lc->clean_bits); 486 else 487 dm_io_client_destroy(lc->io_req.client); 488 vfree(lc->disk_header); 489 kfree(lc); 490 return -ENOMEM; 491 } 492 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); 493 lc->sync_count = (sync == NOSYNC) ? region_count : 0; 494 495 lc->recovering_bits = vzalloc(bitset_size); 496 if (!lc->recovering_bits) { 497 DMWARN("couldn't allocate sync bitset"); 498 vfree(lc->sync_bits); 499 if (!dev) 500 vfree(lc->clean_bits); 501 else 502 dm_io_client_destroy(lc->io_req.client); 503 vfree(lc->disk_header); 504 kfree(lc); 505 return -ENOMEM; 506 } 507 lc->sync_search = 0; 508 log->context = lc; 509 510 return 0; 511 } 512 513 static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, 514 unsigned int argc, char **argv) 515 { 516 return create_log_context(log, ti, argc, argv, NULL); 517 } 518 519 static void destroy_log_context(struct log_c *lc) 520 { 521 vfree(lc->sync_bits); 522 vfree(lc->recovering_bits); 523 kfree(lc); 524 } 525 526 static void core_dtr(struct dm_dirty_log *log) 527 { 528 struct log_c *lc = (struct log_c *) log->context; 529 530 vfree(lc->clean_bits); 531 destroy_log_context(lc); 532 } 533 534 /*---------------------------------------------------------------- 535 * disk log constructor/destructor 536 * 537 * argv contains log_device region_size followed optionally by [no]sync 538 *--------------------------------------------------------------*/ 539 static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, 540 unsigned int argc, char **argv) 541 { 542 int r; 543 struct dm_dev *dev; 544 545 if (argc < 2 || argc > 3) { 546 DMWARN("wrong number of arguments to disk dirty region log"); 547 return -EINVAL; 548 } 549 550 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); 551 if (r) 552 return r; 553 554 r = create_log_context(log, ti, argc - 1, argv + 1, dev); 555 if (r) { 556 dm_put_device(ti, dev); 557 return r; 558 } 559 560 return 0; 561 } 562 563 static void disk_dtr(struct dm_dirty_log *log) 564 { 565 struct log_c *lc = (struct log_c *) log->context; 566 567 dm_put_device(lc->ti, lc->log_dev); 568 vfree(lc->disk_header); 569 dm_io_client_destroy(lc->io_req.client); 570 destroy_log_context(lc); 571 } 572 573 static int count_bits32(uint32_t *addr, unsigned size) 574 { 575 int count = 0, i; 576 577 for (i = 0; i < size; i++) { 578 count += hweight32(*(addr+i)); 579 } 580 return count; 581 } 582 583 static void fail_log_device(struct log_c *lc) 584 { 585 if (lc->log_dev_failed) 586 return; 587 588 lc->log_dev_failed = 1; 589 dm_table_event(lc->ti->table); 590 } 591 592 static int disk_resume(struct dm_dirty_log *log) 593 { 594 int r; 595 unsigned i; 596 struct log_c *lc = (struct log_c *) log->context; 597 size_t size = lc->bitset_uint32_count * sizeof(uint32_t); 598 599 /* read the disk header */ 600 r = read_header(lc); 601 if (r) { 602 DMWARN("%s: Failed to read header on dirty region log device", 603 lc->log_dev->name); 604 fail_log_device(lc); 605 /* 606 * If the log device cannot be read, we must assume 607 * all regions are out-of-sync. If we simply return 608 * here, the state will be uninitialized and could 609 * lead us to return 'in-sync' status for regions 610 * that are actually 'out-of-sync'. 611 */ 612 lc->header.nr_regions = 0; 613 } 614 615 /* set or clear any new bits -- device has grown */ 616 if (lc->sync == NOSYNC) 617 for (i = lc->header.nr_regions; i < lc->region_count; i++) 618 /* FIXME: amazingly inefficient */ 619 log_set_bit(lc, lc->clean_bits, i); 620 else 621 for (i = lc->header.nr_regions; i < lc->region_count; i++) 622 /* FIXME: amazingly inefficient */ 623 log_clear_bit(lc, lc->clean_bits, i); 624 625 /* clear any old bits -- device has shrunk */ 626 for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) 627 log_clear_bit(lc, lc->clean_bits, i); 628 629 /* copy clean across to sync */ 630 memcpy(lc->sync_bits, lc->clean_bits, size); 631 lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); 632 lc->sync_search = 0; 633 634 /* set the correct number of regions in the header */ 635 lc->header.nr_regions = lc->region_count; 636 637 header_to_disk(&lc->header, lc->disk_header); 638 639 /* write the new header */ 640 r = rw_header(lc, WRITE); 641 if (!r) { 642 r = flush_header(lc); 643 if (r) 644 lc->log_dev_flush_failed = 1; 645 } 646 if (r) { 647 DMWARN("%s: Failed to write header on dirty region log device", 648 lc->log_dev->name); 649 fail_log_device(lc); 650 } 651 652 return r; 653 } 654 655 static uint32_t core_get_region_size(struct dm_dirty_log *log) 656 { 657 struct log_c *lc = (struct log_c *) log->context; 658 return lc->region_size; 659 } 660 661 static int core_resume(struct dm_dirty_log *log) 662 { 663 struct log_c *lc = (struct log_c *) log->context; 664 lc->sync_search = 0; 665 return 0; 666 } 667 668 static int core_is_clean(struct dm_dirty_log *log, region_t region) 669 { 670 struct log_c *lc = (struct log_c *) log->context; 671 return log_test_bit(lc->clean_bits, region); 672 } 673 674 static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) 675 { 676 struct log_c *lc = (struct log_c *) log->context; 677 return log_test_bit(lc->sync_bits, region); 678 } 679 680 static int core_flush(struct dm_dirty_log *log) 681 { 682 /* no op */ 683 return 0; 684 } 685 686 static int disk_flush(struct dm_dirty_log *log) 687 { 688 int r, i; 689 struct log_c *lc = log->context; 690 691 /* only write if the log has changed */ 692 if (!lc->touched_cleaned && !lc->touched_dirtied) 693 return 0; 694 695 if (lc->touched_cleaned && log->flush_callback_fn && 696 log->flush_callback_fn(lc->ti)) { 697 /* 698 * At this point it is impossible to determine which 699 * regions are clean and which are dirty (without 700 * re-reading the log off disk). So mark all of them 701 * dirty. 702 */ 703 lc->flush_failed = 1; 704 for (i = 0; i < lc->region_count; i++) 705 log_clear_bit(lc, lc->clean_bits, i); 706 } 707 708 r = rw_header(lc, WRITE); 709 if (r) 710 fail_log_device(lc); 711 else { 712 if (lc->touched_dirtied) { 713 r = flush_header(lc); 714 if (r) { 715 lc->log_dev_flush_failed = 1; 716 fail_log_device(lc); 717 } else 718 lc->touched_dirtied = 0; 719 } 720 lc->touched_cleaned = 0; 721 } 722 723 return r; 724 } 725 726 static void core_mark_region(struct dm_dirty_log *log, region_t region) 727 { 728 struct log_c *lc = (struct log_c *) log->context; 729 log_clear_bit(lc, lc->clean_bits, region); 730 } 731 732 static void core_clear_region(struct dm_dirty_log *log, region_t region) 733 { 734 struct log_c *lc = (struct log_c *) log->context; 735 if (likely(!lc->flush_failed)) 736 log_set_bit(lc, lc->clean_bits, region); 737 } 738 739 static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) 740 { 741 struct log_c *lc = (struct log_c *) log->context; 742 743 if (lc->sync_search >= lc->region_count) 744 return 0; 745 746 do { 747 *region = find_next_zero_bit_le(lc->sync_bits, 748 lc->region_count, 749 lc->sync_search); 750 lc->sync_search = *region + 1; 751 752 if (*region >= lc->region_count) 753 return 0; 754 755 } while (log_test_bit(lc->recovering_bits, *region)); 756 757 log_set_bit(lc, lc->recovering_bits, *region); 758 return 1; 759 } 760 761 static void core_set_region_sync(struct dm_dirty_log *log, region_t region, 762 int in_sync) 763 { 764 struct log_c *lc = (struct log_c *) log->context; 765 766 log_clear_bit(lc, lc->recovering_bits, region); 767 if (in_sync) { 768 log_set_bit(lc, lc->sync_bits, region); 769 lc->sync_count++; 770 } else if (log_test_bit(lc->sync_bits, region)) { 771 lc->sync_count--; 772 log_clear_bit(lc, lc->sync_bits, region); 773 } 774 } 775 776 static region_t core_get_sync_count(struct dm_dirty_log *log) 777 { 778 struct log_c *lc = (struct log_c *) log->context; 779 780 return lc->sync_count; 781 } 782 783 #define DMEMIT_SYNC \ 784 if (lc->sync != DEFAULTSYNC) \ 785 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") 786 787 static int core_status(struct dm_dirty_log *log, status_type_t status, 788 char *result, unsigned int maxlen) 789 { 790 int sz = 0; 791 struct log_c *lc = log->context; 792 793 switch(status) { 794 case STATUSTYPE_INFO: 795 DMEMIT("1 %s", log->type->name); 796 break; 797 798 case STATUSTYPE_TABLE: 799 DMEMIT("%s %u %u ", log->type->name, 800 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); 801 DMEMIT_SYNC; 802 } 803 804 return sz; 805 } 806 807 static int disk_status(struct dm_dirty_log *log, status_type_t status, 808 char *result, unsigned int maxlen) 809 { 810 int sz = 0; 811 struct log_c *lc = log->context; 812 813 switch(status) { 814 case STATUSTYPE_INFO: 815 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, 816 lc->log_dev_flush_failed ? 'F' : 817 lc->log_dev_failed ? 'D' : 818 'A'); 819 break; 820 821 case STATUSTYPE_TABLE: 822 DMEMIT("%s %u %s %u ", log->type->name, 823 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, 824 lc->region_size); 825 DMEMIT_SYNC; 826 } 827 828 return sz; 829 } 830 831 static struct dm_dirty_log_type _core_type = { 832 .name = "core", 833 .module = THIS_MODULE, 834 .ctr = core_ctr, 835 .dtr = core_dtr, 836 .resume = core_resume, 837 .get_region_size = core_get_region_size, 838 .is_clean = core_is_clean, 839 .in_sync = core_in_sync, 840 .flush = core_flush, 841 .mark_region = core_mark_region, 842 .clear_region = core_clear_region, 843 .get_resync_work = core_get_resync_work, 844 .set_region_sync = core_set_region_sync, 845 .get_sync_count = core_get_sync_count, 846 .status = core_status, 847 }; 848 849 static struct dm_dirty_log_type _disk_type = { 850 .name = "disk", 851 .module = THIS_MODULE, 852 .ctr = disk_ctr, 853 .dtr = disk_dtr, 854 .postsuspend = disk_flush, 855 .resume = disk_resume, 856 .get_region_size = core_get_region_size, 857 .is_clean = core_is_clean, 858 .in_sync = core_in_sync, 859 .flush = disk_flush, 860 .mark_region = core_mark_region, 861 .clear_region = core_clear_region, 862 .get_resync_work = core_get_resync_work, 863 .set_region_sync = core_set_region_sync, 864 .get_sync_count = core_get_sync_count, 865 .status = disk_status, 866 }; 867 868 static int __init dm_dirty_log_init(void) 869 { 870 int r; 871 872 r = dm_dirty_log_type_register(&_core_type); 873 if (r) 874 DMWARN("couldn't register core log"); 875 876 r = dm_dirty_log_type_register(&_disk_type); 877 if (r) { 878 DMWARN("couldn't register disk type"); 879 dm_dirty_log_type_unregister(&_core_type); 880 } 881 882 return r; 883 } 884 885 static void __exit dm_dirty_log_exit(void) 886 { 887 dm_dirty_log_type_unregister(&_disk_type); 888 dm_dirty_log_type_unregister(&_core_type); 889 } 890 891 module_init(dm_dirty_log_init); 892 module_exit(dm_dirty_log_exit); 893 894 MODULE_DESCRIPTION(DM_NAME " dirty region log"); 895 MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); 896 MODULE_LICENSE("GPL"); 897