1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2003 Sistina Software 4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 5 * 6 * This file is released under the LGPL. 7 */ 8 9 #include <linux/init.h> 10 #include <linux/slab.h> 11 #include <linux/module.h> 12 #include <linux/vmalloc.h> 13 #include <linux/dm-io.h> 14 #include <linux/dm-dirty-log.h> 15 16 #include <linux/device-mapper.h> 17 18 #define DM_MSG_PREFIX "dirty region log" 19 20 static LIST_HEAD(_log_types); 21 static DEFINE_SPINLOCK(_lock); 22 23 static struct dm_dirty_log_type *__find_dirty_log_type(const char *name) 24 { 25 struct dm_dirty_log_type *log_type; 26 27 list_for_each_entry(log_type, &_log_types, list) 28 if (!strcmp(name, log_type->name)) 29 return log_type; 30 31 return NULL; 32 } 33 34 static struct dm_dirty_log_type *_get_dirty_log_type(const char *name) 35 { 36 struct dm_dirty_log_type *log_type; 37 38 spin_lock(&_lock); 39 40 log_type = __find_dirty_log_type(name); 41 if (log_type && !try_module_get(log_type->module)) 42 log_type = NULL; 43 44 spin_unlock(&_lock); 45 46 return log_type; 47 } 48 49 /* 50 * get_type 51 * @type_name 52 * 53 * Attempt to retrieve the dm_dirty_log_type by name. If not already 54 * available, attempt to load the appropriate module. 55 * 56 * Log modules are named "dm-log-" followed by the 'type_name'. 57 * Modules may contain multiple types. 58 * This function will first try the module "dm-log-<type_name>", 59 * then truncate 'type_name' on the last '-' and try again. 60 * 61 * For example, if type_name was "clustered-disk", it would search 62 * 'dm-log-clustered-disk' then 'dm-log-clustered'. 63 * 64 * Returns: dirty_log_type* on success, NULL on failure 65 */ 66 static struct dm_dirty_log_type *get_type(const char *type_name) 67 { 68 char *p, *type_name_dup; 69 struct dm_dirty_log_type *log_type; 70 71 if (!type_name) 72 return NULL; 73 74 log_type = _get_dirty_log_type(type_name); 75 if (log_type) 76 return log_type; 77 78 type_name_dup = kstrdup(type_name, GFP_KERNEL); 79 if (!type_name_dup) { 80 DMWARN("No memory left to attempt log module load for \"%s\"", 81 type_name); 82 return NULL; 83 } 84 85 while (request_module("dm-log-%s", type_name_dup) || 86 !(log_type = _get_dirty_log_type(type_name))) { 87 p = strrchr(type_name_dup, '-'); 88 if (!p) 89 break; 90 p[0] = '\0'; 91 } 92 93 if (!log_type) 94 DMWARN("Module for logging type \"%s\" not found.", type_name); 95 96 kfree(type_name_dup); 97 98 return log_type; 99 } 100 101 static void put_type(struct dm_dirty_log_type *type) 102 { 103 if (!type) 104 return; 105 106 spin_lock(&_lock); 107 if (!__find_dirty_log_type(type->name)) 108 goto out; 109 110 module_put(type->module); 111 112 out: 113 spin_unlock(&_lock); 114 } 115 116 int dm_dirty_log_type_register(struct dm_dirty_log_type *type) 117 { 118 int r = 0; 119 120 spin_lock(&_lock); 121 if (!__find_dirty_log_type(type->name)) 122 list_add(&type->list, &_log_types); 123 else 124 r = -EBUSY; 125 spin_unlock(&_lock); 126 127 return r; 128 } 129 EXPORT_SYMBOL(dm_dirty_log_type_register); 130 131 int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type) 132 { 133 spin_lock(&_lock); 134 135 if (!__find_dirty_log_type(type->name)) { 136 spin_unlock(&_lock); 137 return -EINVAL; 138 } 139 140 list_del(&type->list); 141 142 spin_unlock(&_lock); 143 144 return 0; 145 } 146 EXPORT_SYMBOL(dm_dirty_log_type_unregister); 147 148 struct dm_dirty_log *dm_dirty_log_create(const char *type_name, 149 struct dm_target *ti, 150 int (*flush_callback_fn)(struct dm_target *ti), 151 unsigned int argc, char **argv) 152 { 153 struct dm_dirty_log_type *type; 154 struct dm_dirty_log *log; 155 156 log = kmalloc_obj(*log); 157 if (!log) 158 return NULL; 159 160 type = get_type(type_name); 161 if (!type) { 162 kfree(log); 163 return NULL; 164 } 165 166 log->flush_callback_fn = flush_callback_fn; 167 log->type = type; 168 if (type->ctr(log, ti, argc, argv)) { 169 kfree(log); 170 put_type(type); 171 return NULL; 172 } 173 174 return log; 175 } 176 EXPORT_SYMBOL(dm_dirty_log_create); 177 178 void dm_dirty_log_destroy(struct dm_dirty_log *log) 179 { 180 log->type->dtr(log); 181 put_type(log->type); 182 kfree(log); 183 } 184 EXPORT_SYMBOL(dm_dirty_log_destroy); 185 186 /* 187 *--------------------------------------------------------------- 188 * Persistent and core logs share a lot of their implementation. 189 * FIXME: need a reload method to be called from a resume 190 *--------------------------------------------------------------- 191 */ 192 /* 193 * Magic for persistent mirrors: "MiRr" 194 */ 195 #define MIRROR_MAGIC 0x4D695272 196 197 /* 198 * The on-disk version of the metadata. 199 */ 200 #define MIRROR_DISK_VERSION 2 201 #define LOG_OFFSET 2 202 203 struct log_header_disk { 204 __le32 magic; 205 206 /* 207 * Simple, incrementing version. no backward 208 * compatibility. 209 */ 210 __le32 version; 211 __le64 nr_regions; 212 } __packed; 213 214 struct log_header_core { 215 uint32_t magic; 216 uint32_t version; 217 uint64_t nr_regions; 218 }; 219 220 struct log_c { 221 struct dm_target *ti; 222 int touched_dirtied; 223 int touched_cleaned; 224 int flush_failed; 225 uint32_t region_size; 226 unsigned int region_count; 227 region_t sync_count; 228 229 unsigned int bitset_uint32_count; 230 uint32_t *clean_bits; 231 uint32_t *sync_bits; 232 uint32_t *recovering_bits; /* FIXME: this seems excessive */ 233 234 int sync_search; 235 236 /* Resync flag */ 237 enum sync { 238 DEFAULTSYNC, /* Synchronize if necessary */ 239 NOSYNC, /* Devices known to be already in sync */ 240 FORCESYNC, /* Force a sync to happen */ 241 } sync; 242 243 struct dm_io_request io_req; 244 245 /* 246 * Disk log fields 247 */ 248 int log_dev_failed; 249 int log_dev_flush_failed; 250 struct dm_dev *log_dev; 251 struct log_header_core header; 252 253 struct dm_io_region header_location; 254 struct log_header_disk *disk_header; 255 }; 256 257 /* 258 * The touched member needs to be updated every time we access 259 * one of the bitsets. 260 */ 261 static inline int log_test_bit(uint32_t *bs, unsigned int bit) 262 { 263 return test_bit_le(bit, bs) ? 1 : 0; 264 } 265 266 static inline void log_set_bit(struct log_c *l, 267 uint32_t *bs, unsigned int bit) 268 { 269 __set_bit_le(bit, bs); 270 l->touched_cleaned = 1; 271 } 272 273 static inline void log_clear_bit(struct log_c *l, 274 uint32_t *bs, unsigned int bit) 275 { 276 __clear_bit_le(bit, bs); 277 l->touched_dirtied = 1; 278 } 279 280 /* 281 *--------------------------------------------------------------- 282 * Header IO 283 *-------------------------------------------------------------- 284 */ 285 static void header_to_disk(struct log_header_core *core, struct log_header_disk *disk) 286 { 287 disk->magic = cpu_to_le32(core->magic); 288 disk->version = cpu_to_le32(core->version); 289 disk->nr_regions = cpu_to_le64(core->nr_regions); 290 } 291 292 static void header_from_disk(struct log_header_core *core, struct log_header_disk *disk) 293 { 294 core->magic = le32_to_cpu(disk->magic); 295 core->version = le32_to_cpu(disk->version); 296 core->nr_regions = le64_to_cpu(disk->nr_regions); 297 } 298 299 static int rw_header(struct log_c *lc, enum req_op op) 300 { 301 lc->io_req.bi_opf = op; 302 303 return dm_io(&lc->io_req, 1, &lc->header_location, NULL, IOPRIO_DEFAULT); 304 } 305 306 static int flush_header(struct log_c *lc) 307 { 308 struct dm_io_region null_location = { 309 .bdev = lc->header_location.bdev, 310 .sector = 0, 311 .count = 0, 312 }; 313 314 lc->io_req.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; 315 316 return dm_io(&lc->io_req, 1, &null_location, NULL, IOPRIO_DEFAULT); 317 } 318 319 static int read_header(struct log_c *log) 320 { 321 int r; 322 323 r = rw_header(log, REQ_OP_READ); 324 if (r) 325 return r; 326 327 header_from_disk(&log->header, log->disk_header); 328 329 /* New log required? */ 330 if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { 331 log->header.magic = MIRROR_MAGIC; 332 log->header.version = MIRROR_DISK_VERSION; 333 log->header.nr_regions = 0; 334 } 335 336 #ifdef __LITTLE_ENDIAN 337 if (log->header.version == 1) 338 log->header.version = 2; 339 #endif 340 341 if (log->header.version != MIRROR_DISK_VERSION) { 342 DMWARN("incompatible disk log version"); 343 return -EINVAL; 344 } 345 346 return 0; 347 } 348 349 static int _check_region_size(struct dm_target *ti, uint32_t region_size) 350 { 351 if (region_size < 2 || region_size > ti->len) 352 return 0; 353 354 if (!is_power_of_2(region_size)) 355 return 0; 356 357 return 1; 358 } 359 360 /* 361 *-------------------------------------------------------------- 362 * core log constructor/destructor 363 * 364 * argv contains region_size followed optionally by [no]sync 365 *-------------------------------------------------------------- 366 */ 367 #define BYTE_SHIFT 3 368 static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, 369 unsigned int argc, char **argv, 370 struct dm_dev *dev) 371 { 372 enum sync sync = DEFAULTSYNC; 373 374 struct log_c *lc; 375 uint32_t region_size; 376 sector_t region_count; 377 size_t bitset_size, buf_size; 378 int r; 379 char dummy; 380 381 if (argc < 1 || argc > 2) { 382 DMWARN("wrong number of arguments to dirty region log"); 383 return -EINVAL; 384 } 385 386 if (argc > 1) { 387 if (!strcmp(argv[1], "sync")) 388 sync = FORCESYNC; 389 else if (!strcmp(argv[1], "nosync")) 390 sync = NOSYNC; 391 else { 392 DMWARN("unrecognised sync argument to dirty region log: %s", argv[1]); 393 return -EINVAL; 394 } 395 } 396 397 if (sscanf(argv[0], "%u%c", ®ion_size, &dummy) != 1 || 398 !_check_region_size(ti, region_size)) { 399 DMWARN("invalid region size %s", argv[0]); 400 return -EINVAL; 401 } 402 403 region_count = dm_sector_div_up(ti->len, region_size); 404 if (region_count > UINT_MAX) { 405 DMWARN("region count exceeds limit of %u", UINT_MAX); 406 return -EINVAL; 407 } 408 409 lc = kmalloc_obj(*lc); 410 if (!lc) { 411 DMWARN("couldn't allocate core log"); 412 return -ENOMEM; 413 } 414 415 lc->ti = ti; 416 lc->touched_dirtied = 0; 417 lc->touched_cleaned = 0; 418 lc->flush_failed = 0; 419 lc->region_size = region_size; 420 lc->region_count = region_count; 421 lc->sync = sync; 422 423 /* 424 * Work out how many "unsigned long"s we need to hold the bitset. 425 */ 426 bitset_size = dm_round_up(region_count, BITS_PER_LONG); 427 bitset_size >>= BYTE_SHIFT; 428 429 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); 430 431 /* 432 * Disk log? 433 */ 434 if (!dev) { 435 lc->clean_bits = vmalloc(bitset_size); 436 if (!lc->clean_bits) { 437 DMWARN("couldn't allocate clean bitset"); 438 kfree(lc); 439 return -ENOMEM; 440 } 441 lc->disk_header = NULL; 442 } else { 443 lc->log_dev = dev; 444 lc->log_dev_failed = 0; 445 lc->log_dev_flush_failed = 0; 446 lc->header_location.bdev = lc->log_dev->bdev; 447 lc->header_location.sector = 0; 448 449 /* 450 * Buffer holds both header and bitset. 451 */ 452 buf_size = 453 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, 454 bdev_logical_block_size(lc->header_location.bdev)); 455 456 if (buf_size > bdev_nr_bytes(dev->bdev)) { 457 DMWARN("log device %s too small: need %llu bytes", 458 dev->name, (unsigned long long)buf_size); 459 kfree(lc); 460 return -EINVAL; 461 } 462 463 lc->header_location.count = buf_size >> SECTOR_SHIFT; 464 465 lc->io_req.mem.type = DM_IO_VMA; 466 lc->io_req.notify.fn = NULL; 467 lc->io_req.client = dm_io_client_create(); 468 if (IS_ERR(lc->io_req.client)) { 469 r = PTR_ERR(lc->io_req.client); 470 DMWARN("couldn't allocate disk io client"); 471 kfree(lc); 472 return r; 473 } 474 475 lc->disk_header = vmalloc(buf_size); 476 if (!lc->disk_header) { 477 DMWARN("couldn't allocate disk log buffer"); 478 dm_io_client_destroy(lc->io_req.client); 479 kfree(lc); 480 return -ENOMEM; 481 } 482 483 lc->io_req.mem.ptr.vma = lc->disk_header; 484 lc->clean_bits = (void *)lc->disk_header + 485 (LOG_OFFSET << SECTOR_SHIFT); 486 } 487 488 memset(lc->clean_bits, -1, bitset_size); 489 490 lc->sync_bits = vmalloc(bitset_size); 491 if (!lc->sync_bits) { 492 DMWARN("couldn't allocate sync bitset"); 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->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); 502 lc->sync_count = (sync == NOSYNC) ? region_count : 0; 503 504 lc->recovering_bits = vzalloc(bitset_size); 505 if (!lc->recovering_bits) { 506 DMWARN("couldn't allocate sync bitset"); 507 vfree(lc->sync_bits); 508 if (!dev) 509 vfree(lc->clean_bits); 510 else 511 dm_io_client_destroy(lc->io_req.client); 512 vfree(lc->disk_header); 513 kfree(lc); 514 return -ENOMEM; 515 } 516 lc->sync_search = 0; 517 log->context = lc; 518 519 return 0; 520 } 521 522 static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, 523 unsigned int argc, char **argv) 524 { 525 return create_log_context(log, ti, argc, argv, NULL); 526 } 527 528 static void destroy_log_context(struct log_c *lc) 529 { 530 vfree(lc->sync_bits); 531 vfree(lc->recovering_bits); 532 kfree(lc); 533 } 534 535 static void core_dtr(struct dm_dirty_log *log) 536 { 537 struct log_c *lc = log->context; 538 539 vfree(lc->clean_bits); 540 destroy_log_context(lc); 541 } 542 543 /* 544 *--------------------------------------------------------------------- 545 * disk log constructor/destructor 546 * 547 * argv contains log_device region_size followed optionally by [no]sync 548 *--------------------------------------------------------------------- 549 */ 550 static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, 551 unsigned int argc, char **argv) 552 { 553 int r; 554 struct dm_dev *dev; 555 556 if (argc < 2 || argc > 3) { 557 DMWARN("wrong number of arguments to disk dirty region log"); 558 return -EINVAL; 559 } 560 561 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); 562 if (r) 563 return r; 564 565 r = create_log_context(log, ti, argc - 1, argv + 1, dev); 566 if (r) { 567 dm_put_device(ti, dev); 568 return r; 569 } 570 571 return 0; 572 } 573 574 static void disk_dtr(struct dm_dirty_log *log) 575 { 576 struct log_c *lc = log->context; 577 578 dm_put_device(lc->ti, lc->log_dev); 579 vfree(lc->disk_header); 580 dm_io_client_destroy(lc->io_req.client); 581 destroy_log_context(lc); 582 } 583 584 static void fail_log_device(struct log_c *lc) 585 { 586 if (lc->log_dev_failed) 587 return; 588 589 lc->log_dev_failed = 1; 590 dm_table_event(lc->ti->table); 591 } 592 593 static int disk_resume(struct dm_dirty_log *log) 594 { 595 int r; 596 unsigned int i; 597 struct log_c *lc = log->context; 598 size_t size = lc->bitset_uint32_count * sizeof(uint32_t); 599 600 /* read the disk header */ 601 r = read_header(lc); 602 if (r) { 603 DMWARN("%s: Failed to read header on dirty region log device", 604 lc->log_dev->name); 605 fail_log_device(lc); 606 /* 607 * If the log device cannot be read, we must assume 608 * all regions are out-of-sync. If we simply return 609 * here, the state will be uninitialized and could 610 * lead us to return 'in-sync' status for regions 611 * that are actually 'out-of-sync'. 612 */ 613 lc->header.nr_regions = 0; 614 } 615 616 /* set or clear any new bits -- device has grown */ 617 if (lc->sync == NOSYNC) 618 for (i = lc->header.nr_regions; i < lc->region_count; i++) 619 /* FIXME: amazingly inefficient */ 620 log_set_bit(lc, lc->clean_bits, i); 621 else 622 for (i = lc->header.nr_regions; i < lc->region_count; i++) 623 /* FIXME: amazingly inefficient */ 624 log_clear_bit(lc, lc->clean_bits, i); 625 626 /* clear any old bits -- device has shrunk */ 627 for (i = lc->region_count; i % BITS_PER_LONG; i++) 628 log_clear_bit(lc, lc->clean_bits, i); 629 630 /* copy clean across to sync */ 631 memcpy(lc->sync_bits, lc->clean_bits, size); 632 lc->sync_count = memweight(lc->clean_bits, 633 lc->bitset_uint32_count * sizeof(uint32_t)); 634 lc->sync_search = 0; 635 636 /* set the correct number of regions in the header */ 637 lc->header.nr_regions = lc->region_count; 638 639 header_to_disk(&lc->header, lc->disk_header); 640 641 /* write the new header */ 642 r = rw_header(lc, REQ_OP_WRITE); 643 if (!r) { 644 r = flush_header(lc); 645 if (r) 646 lc->log_dev_flush_failed = 1; 647 } 648 if (r) { 649 DMWARN("%s: Failed to write header on dirty region log device", 650 lc->log_dev->name); 651 fail_log_device(lc); 652 } 653 654 return r; 655 } 656 657 static uint32_t core_get_region_size(struct dm_dirty_log *log) 658 { 659 struct log_c *lc = log->context; 660 661 return lc->region_size; 662 } 663 664 static int core_resume(struct dm_dirty_log *log) 665 { 666 struct log_c *lc = log->context; 667 668 lc->sync_search = 0; 669 return 0; 670 } 671 672 static int core_is_clean(struct dm_dirty_log *log, region_t region) 673 { 674 struct log_c *lc = log->context; 675 676 return log_test_bit(lc->clean_bits, region); 677 } 678 679 static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) 680 { 681 struct log_c *lc = log->context; 682 683 return log_test_bit(lc->sync_bits, region); 684 } 685 686 static int core_flush(struct dm_dirty_log *log) 687 { 688 /* no op */ 689 return 0; 690 } 691 692 static int disk_flush(struct dm_dirty_log *log) 693 { 694 int r, i; 695 struct log_c *lc = log->context; 696 697 /* only write if the log has changed */ 698 if (!lc->touched_cleaned && !lc->touched_dirtied) 699 return 0; 700 701 if (lc->touched_cleaned && log->flush_callback_fn && 702 log->flush_callback_fn(lc->ti)) { 703 /* 704 * At this point it is impossible to determine which 705 * regions are clean and which are dirty (without 706 * re-reading the log off disk). So mark all of them 707 * dirty. 708 */ 709 lc->flush_failed = 1; 710 for (i = 0; i < lc->region_count; i++) 711 log_clear_bit(lc, lc->clean_bits, i); 712 } 713 714 r = rw_header(lc, REQ_OP_WRITE); 715 if (r) 716 fail_log_device(lc); 717 else { 718 if (lc->touched_dirtied) { 719 r = flush_header(lc); 720 if (r) { 721 lc->log_dev_flush_failed = 1; 722 fail_log_device(lc); 723 } else 724 lc->touched_dirtied = 0; 725 } 726 lc->touched_cleaned = 0; 727 } 728 729 return r; 730 } 731 732 static void core_mark_region(struct dm_dirty_log *log, region_t region) 733 { 734 struct log_c *lc = log->context; 735 736 log_clear_bit(lc, lc->clean_bits, region); 737 } 738 739 static void core_clear_region(struct dm_dirty_log *log, region_t region) 740 { 741 struct log_c *lc = log->context; 742 743 if (likely(!lc->flush_failed)) 744 log_set_bit(lc, lc->clean_bits, region); 745 } 746 747 static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) 748 { 749 struct log_c *lc = log->context; 750 751 if (lc->sync_search >= lc->region_count) 752 return 0; 753 754 do { 755 *region = find_next_zero_bit_le(lc->sync_bits, 756 lc->region_count, 757 lc->sync_search); 758 lc->sync_search = *region + 1; 759 760 if (*region >= lc->region_count) 761 return 0; 762 763 } while (log_test_bit(lc->recovering_bits, *region)); 764 765 log_set_bit(lc, lc->recovering_bits, *region); 766 return 1; 767 } 768 769 static void core_set_region_sync(struct dm_dirty_log *log, region_t region, 770 int in_sync) 771 { 772 struct log_c *lc = log->context; 773 774 log_clear_bit(lc, lc->recovering_bits, region); 775 if (in_sync) { 776 log_set_bit(lc, lc->sync_bits, region); 777 lc->sync_count++; 778 } else if (log_test_bit(lc->sync_bits, region)) { 779 lc->sync_count--; 780 log_clear_bit(lc, lc->sync_bits, region); 781 } 782 } 783 784 static region_t core_get_sync_count(struct dm_dirty_log *log) 785 { 786 struct log_c *lc = log->context; 787 788 return lc->sync_count; 789 } 790 791 #define DMEMIT_SYNC \ 792 do { \ 793 if (lc->sync != DEFAULTSYNC) \ 794 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : ""); \ 795 } while (0) 796 797 static int core_status(struct dm_dirty_log *log, status_type_t status, 798 char *result, unsigned int maxlen) 799 { 800 int sz = 0; 801 struct log_c *lc = log->context; 802 803 switch (status) { 804 case STATUSTYPE_INFO: 805 DMEMIT("1 %s", log->type->name); 806 break; 807 808 case STATUSTYPE_TABLE: 809 DMEMIT("%s %u %u ", log->type->name, 810 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); 811 DMEMIT_SYNC; 812 break; 813 814 case STATUSTYPE_IMA: 815 *result = '\0'; 816 break; 817 } 818 819 return sz; 820 } 821 822 static int disk_status(struct dm_dirty_log *log, status_type_t status, 823 char *result, unsigned int maxlen) 824 { 825 int sz = 0; 826 struct log_c *lc = log->context; 827 828 switch (status) { 829 case STATUSTYPE_INFO: 830 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, 831 lc->log_dev_flush_failed ? 'F' : 832 lc->log_dev_failed ? 'D' : 833 'A'); 834 break; 835 836 case STATUSTYPE_TABLE: 837 DMEMIT("%s %u %s %u ", log->type->name, 838 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, 839 lc->region_size); 840 DMEMIT_SYNC; 841 break; 842 843 case STATUSTYPE_IMA: 844 *result = '\0'; 845 break; 846 } 847 848 return sz; 849 } 850 851 static struct dm_dirty_log_type _core_type = { 852 .name = "core", 853 .module = THIS_MODULE, 854 .ctr = core_ctr, 855 .dtr = core_dtr, 856 .resume = core_resume, 857 .get_region_size = core_get_region_size, 858 .is_clean = core_is_clean, 859 .in_sync = core_in_sync, 860 .flush = core_flush, 861 .mark_region = core_mark_region, 862 .clear_region = core_clear_region, 863 .get_resync_work = core_get_resync_work, 864 .set_region_sync = core_set_region_sync, 865 .get_sync_count = core_get_sync_count, 866 .status = core_status, 867 }; 868 869 static struct dm_dirty_log_type _disk_type = { 870 .name = "disk", 871 .module = THIS_MODULE, 872 .ctr = disk_ctr, 873 .dtr = disk_dtr, 874 .postsuspend = disk_flush, 875 .resume = disk_resume, 876 .get_region_size = core_get_region_size, 877 .is_clean = core_is_clean, 878 .in_sync = core_in_sync, 879 .flush = disk_flush, 880 .mark_region = core_mark_region, 881 .clear_region = core_clear_region, 882 .get_resync_work = core_get_resync_work, 883 .set_region_sync = core_set_region_sync, 884 .get_sync_count = core_get_sync_count, 885 .status = disk_status, 886 }; 887 888 static int __init dm_dirty_log_init(void) 889 { 890 int r; 891 892 r = dm_dirty_log_type_register(&_core_type); 893 if (r) 894 DMWARN("couldn't register core log"); 895 896 r = dm_dirty_log_type_register(&_disk_type); 897 if (r) { 898 DMWARN("couldn't register disk type"); 899 dm_dirty_log_type_unregister(&_core_type); 900 } 901 902 return r; 903 } 904 905 static void __exit dm_dirty_log_exit(void) 906 { 907 dm_dirty_log_type_unregister(&_disk_type); 908 dm_dirty_log_type_unregister(&_core_type); 909 } 910 911 module_init(dm_dirty_log_init); 912 module_exit(dm_dirty_log_exit); 913 914 MODULE_DESCRIPTION(DM_NAME " dirty region log"); 915 MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@lists.linux.dev>"); 916 MODULE_LICENSE("GPL"); 917