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 = -EEXIST; 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(sizeof(*log), GFP_KERNEL); 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); 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); 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 unsigned int 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); 404 405 lc = kmalloc(sizeof(*lc), GFP_KERNEL); 406 if (!lc) { 407 DMWARN("couldn't allocate core log"); 408 return -ENOMEM; 409 } 410 411 lc->ti = ti; 412 lc->touched_dirtied = 0; 413 lc->touched_cleaned = 0; 414 lc->flush_failed = 0; 415 lc->region_size = region_size; 416 lc->region_count = region_count; 417 lc->sync = sync; 418 419 /* 420 * Work out how many "unsigned long"s we need to hold the bitset. 421 */ 422 bitset_size = dm_round_up(region_count, BITS_PER_LONG); 423 bitset_size >>= BYTE_SHIFT; 424 425 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); 426 427 /* 428 * Disk log? 429 */ 430 if (!dev) { 431 lc->clean_bits = vmalloc(bitset_size); 432 if (!lc->clean_bits) { 433 DMWARN("couldn't allocate clean bitset"); 434 kfree(lc); 435 return -ENOMEM; 436 } 437 lc->disk_header = NULL; 438 } else { 439 lc->log_dev = dev; 440 lc->log_dev_failed = 0; 441 lc->log_dev_flush_failed = 0; 442 lc->header_location.bdev = lc->log_dev->bdev; 443 lc->header_location.sector = 0; 444 445 /* 446 * Buffer holds both header and bitset. 447 */ 448 buf_size = 449 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, 450 bdev_logical_block_size(lc->header_location.bdev)); 451 452 if (buf_size > bdev_nr_bytes(dev->bdev)) { 453 DMWARN("log device %s too small: need %llu bytes", 454 dev->name, (unsigned long long)buf_size); 455 kfree(lc); 456 return -EINVAL; 457 } 458 459 lc->header_location.count = buf_size >> SECTOR_SHIFT; 460 461 lc->io_req.mem.type = DM_IO_VMA; 462 lc->io_req.notify.fn = NULL; 463 lc->io_req.client = dm_io_client_create(); 464 if (IS_ERR(lc->io_req.client)) { 465 r = PTR_ERR(lc->io_req.client); 466 DMWARN("couldn't allocate disk io client"); 467 kfree(lc); 468 return r; 469 } 470 471 lc->disk_header = vmalloc(buf_size); 472 if (!lc->disk_header) { 473 DMWARN("couldn't allocate disk log buffer"); 474 dm_io_client_destroy(lc->io_req.client); 475 kfree(lc); 476 return -ENOMEM; 477 } 478 479 lc->io_req.mem.ptr.vma = lc->disk_header; 480 lc->clean_bits = (void *)lc->disk_header + 481 (LOG_OFFSET << SECTOR_SHIFT); 482 } 483 484 memset(lc->clean_bits, -1, bitset_size); 485 486 lc->sync_bits = vmalloc(bitset_size); 487 if (!lc->sync_bits) { 488 DMWARN("couldn't allocate sync bitset"); 489 if (!dev) 490 vfree(lc->clean_bits); 491 else 492 dm_io_client_destroy(lc->io_req.client); 493 vfree(lc->disk_header); 494 kfree(lc); 495 return -ENOMEM; 496 } 497 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); 498 lc->sync_count = (sync == NOSYNC) ? region_count : 0; 499 500 lc->recovering_bits = vzalloc(bitset_size); 501 if (!lc->recovering_bits) { 502 DMWARN("couldn't allocate sync bitset"); 503 vfree(lc->sync_bits); 504 if (!dev) 505 vfree(lc->clean_bits); 506 else 507 dm_io_client_destroy(lc->io_req.client); 508 vfree(lc->disk_header); 509 kfree(lc); 510 return -ENOMEM; 511 } 512 lc->sync_search = 0; 513 log->context = lc; 514 515 return 0; 516 } 517 518 static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, 519 unsigned int argc, char **argv) 520 { 521 return create_log_context(log, ti, argc, argv, NULL); 522 } 523 524 static void destroy_log_context(struct log_c *lc) 525 { 526 vfree(lc->sync_bits); 527 vfree(lc->recovering_bits); 528 kfree(lc); 529 } 530 531 static void core_dtr(struct dm_dirty_log *log) 532 { 533 struct log_c *lc = log->context; 534 535 vfree(lc->clean_bits); 536 destroy_log_context(lc); 537 } 538 539 /* 540 *--------------------------------------------------------------------- 541 * disk log constructor/destructor 542 * 543 * argv contains log_device region_size followed optionally by [no]sync 544 *--------------------------------------------------------------------- 545 */ 546 static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, 547 unsigned int argc, char **argv) 548 { 549 int r; 550 struct dm_dev *dev; 551 552 if (argc < 2 || argc > 3) { 553 DMWARN("wrong number of arguments to disk dirty region log"); 554 return -EINVAL; 555 } 556 557 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); 558 if (r) 559 return r; 560 561 r = create_log_context(log, ti, argc - 1, argv + 1, dev); 562 if (r) { 563 dm_put_device(ti, dev); 564 return r; 565 } 566 567 return 0; 568 } 569 570 static void disk_dtr(struct dm_dirty_log *log) 571 { 572 struct log_c *lc = log->context; 573 574 dm_put_device(lc->ti, lc->log_dev); 575 vfree(lc->disk_header); 576 dm_io_client_destroy(lc->io_req.client); 577 destroy_log_context(lc); 578 } 579 580 static void fail_log_device(struct log_c *lc) 581 { 582 if (lc->log_dev_failed) 583 return; 584 585 lc->log_dev_failed = 1; 586 dm_table_event(lc->ti->table); 587 } 588 589 static int disk_resume(struct dm_dirty_log *log) 590 { 591 int r; 592 unsigned int i; 593 struct log_c *lc = log->context; 594 size_t size = lc->bitset_uint32_count * sizeof(uint32_t); 595 596 /* read the disk header */ 597 r = read_header(lc); 598 if (r) { 599 DMWARN("%s: Failed to read header on dirty region log device", 600 lc->log_dev->name); 601 fail_log_device(lc); 602 /* 603 * If the log device cannot be read, we must assume 604 * all regions are out-of-sync. If we simply return 605 * here, the state will be uninitialized and could 606 * lead us to return 'in-sync' status for regions 607 * that are actually 'out-of-sync'. 608 */ 609 lc->header.nr_regions = 0; 610 } 611 612 /* set or clear any new bits -- device has grown */ 613 if (lc->sync == NOSYNC) 614 for (i = lc->header.nr_regions; i < lc->region_count; i++) 615 /* FIXME: amazingly inefficient */ 616 log_set_bit(lc, lc->clean_bits, i); 617 else 618 for (i = lc->header.nr_regions; i < lc->region_count; i++) 619 /* FIXME: amazingly inefficient */ 620 log_clear_bit(lc, lc->clean_bits, i); 621 622 /* clear any old bits -- device has shrunk */ 623 for (i = lc->region_count; i % BITS_PER_LONG; i++) 624 log_clear_bit(lc, lc->clean_bits, i); 625 626 /* copy clean across to sync */ 627 memcpy(lc->sync_bits, lc->clean_bits, size); 628 lc->sync_count = memweight(lc->clean_bits, 629 lc->bitset_uint32_count * sizeof(uint32_t)); 630 lc->sync_search = 0; 631 632 /* set the correct number of regions in the header */ 633 lc->header.nr_regions = lc->region_count; 634 635 header_to_disk(&lc->header, lc->disk_header); 636 637 /* write the new header */ 638 r = rw_header(lc, REQ_OP_WRITE); 639 if (!r) { 640 r = flush_header(lc); 641 if (r) 642 lc->log_dev_flush_failed = 1; 643 } 644 if (r) { 645 DMWARN("%s: Failed to write header on dirty region log device", 646 lc->log_dev->name); 647 fail_log_device(lc); 648 } 649 650 return r; 651 } 652 653 static uint32_t core_get_region_size(struct dm_dirty_log *log) 654 { 655 struct log_c *lc = log->context; 656 657 return lc->region_size; 658 } 659 660 static int core_resume(struct dm_dirty_log *log) 661 { 662 struct log_c *lc = log->context; 663 664 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 = log->context; 671 672 return log_test_bit(lc->clean_bits, region); 673 } 674 675 static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) 676 { 677 struct log_c *lc = log->context; 678 679 return log_test_bit(lc->sync_bits, region); 680 } 681 682 static int core_flush(struct dm_dirty_log *log) 683 { 684 /* no op */ 685 return 0; 686 } 687 688 static int disk_flush(struct dm_dirty_log *log) 689 { 690 int r, i; 691 struct log_c *lc = log->context; 692 693 /* only write if the log has changed */ 694 if (!lc->touched_cleaned && !lc->touched_dirtied) 695 return 0; 696 697 if (lc->touched_cleaned && log->flush_callback_fn && 698 log->flush_callback_fn(lc->ti)) { 699 /* 700 * At this point it is impossible to determine which 701 * regions are clean and which are dirty (without 702 * re-reading the log off disk). So mark all of them 703 * dirty. 704 */ 705 lc->flush_failed = 1; 706 for (i = 0; i < lc->region_count; i++) 707 log_clear_bit(lc, lc->clean_bits, i); 708 } 709 710 r = rw_header(lc, REQ_OP_WRITE); 711 if (r) 712 fail_log_device(lc); 713 else { 714 if (lc->touched_dirtied) { 715 r = flush_header(lc); 716 if (r) { 717 lc->log_dev_flush_failed = 1; 718 fail_log_device(lc); 719 } else 720 lc->touched_dirtied = 0; 721 } 722 lc->touched_cleaned = 0; 723 } 724 725 return r; 726 } 727 728 static void core_mark_region(struct dm_dirty_log *log, region_t region) 729 { 730 struct log_c *lc = log->context; 731 732 log_clear_bit(lc, lc->clean_bits, region); 733 } 734 735 static void core_clear_region(struct dm_dirty_log *log, region_t region) 736 { 737 struct log_c *lc = log->context; 738 739 if (likely(!lc->flush_failed)) 740 log_set_bit(lc, lc->clean_bits, region); 741 } 742 743 static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) 744 { 745 struct log_c *lc = log->context; 746 747 if (lc->sync_search >= lc->region_count) 748 return 0; 749 750 do { 751 *region = find_next_zero_bit_le(lc->sync_bits, 752 lc->region_count, 753 lc->sync_search); 754 lc->sync_search = *region + 1; 755 756 if (*region >= lc->region_count) 757 return 0; 758 759 } while (log_test_bit(lc->recovering_bits, *region)); 760 761 log_set_bit(lc, lc->recovering_bits, *region); 762 return 1; 763 } 764 765 static void core_set_region_sync(struct dm_dirty_log *log, region_t region, 766 int in_sync) 767 { 768 struct log_c *lc = log->context; 769 770 log_clear_bit(lc, lc->recovering_bits, region); 771 if (in_sync) { 772 log_set_bit(lc, lc->sync_bits, region); 773 lc->sync_count++; 774 } else if (log_test_bit(lc->sync_bits, region)) { 775 lc->sync_count--; 776 log_clear_bit(lc, lc->sync_bits, region); 777 } 778 } 779 780 static region_t core_get_sync_count(struct dm_dirty_log *log) 781 { 782 struct log_c *lc = log->context; 783 784 return lc->sync_count; 785 } 786 787 #define DMEMIT_SYNC \ 788 do { \ 789 if (lc->sync != DEFAULTSYNC) \ 790 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : ""); \ 791 } while (0) 792 793 static int core_status(struct dm_dirty_log *log, status_type_t status, 794 char *result, unsigned int maxlen) 795 { 796 int sz = 0; 797 struct log_c *lc = log->context; 798 799 switch (status) { 800 case STATUSTYPE_INFO: 801 DMEMIT("1 %s", log->type->name); 802 break; 803 804 case STATUSTYPE_TABLE: 805 DMEMIT("%s %u %u ", log->type->name, 806 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); 807 DMEMIT_SYNC; 808 break; 809 810 case STATUSTYPE_IMA: 811 *result = '\0'; 812 break; 813 } 814 815 return sz; 816 } 817 818 static int disk_status(struct dm_dirty_log *log, status_type_t status, 819 char *result, unsigned int maxlen) 820 { 821 int sz = 0; 822 struct log_c *lc = log->context; 823 824 switch (status) { 825 case STATUSTYPE_INFO: 826 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, 827 lc->log_dev_flush_failed ? 'F' : 828 lc->log_dev_failed ? 'D' : 829 'A'); 830 break; 831 832 case STATUSTYPE_TABLE: 833 DMEMIT("%s %u %s %u ", log->type->name, 834 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, 835 lc->region_size); 836 DMEMIT_SYNC; 837 break; 838 839 case STATUSTYPE_IMA: 840 *result = '\0'; 841 break; 842 } 843 844 return sz; 845 } 846 847 static struct dm_dirty_log_type _core_type = { 848 .name = "core", 849 .module = THIS_MODULE, 850 .ctr = core_ctr, 851 .dtr = core_dtr, 852 .resume = core_resume, 853 .get_region_size = core_get_region_size, 854 .is_clean = core_is_clean, 855 .in_sync = core_in_sync, 856 .flush = core_flush, 857 .mark_region = core_mark_region, 858 .clear_region = core_clear_region, 859 .get_resync_work = core_get_resync_work, 860 .set_region_sync = core_set_region_sync, 861 .get_sync_count = core_get_sync_count, 862 .status = core_status, 863 }; 864 865 static struct dm_dirty_log_type _disk_type = { 866 .name = "disk", 867 .module = THIS_MODULE, 868 .ctr = disk_ctr, 869 .dtr = disk_dtr, 870 .postsuspend = disk_flush, 871 .resume = disk_resume, 872 .get_region_size = core_get_region_size, 873 .is_clean = core_is_clean, 874 .in_sync = core_in_sync, 875 .flush = disk_flush, 876 .mark_region = core_mark_region, 877 .clear_region = core_clear_region, 878 .get_resync_work = core_get_resync_work, 879 .set_region_sync = core_set_region_sync, 880 .get_sync_count = core_get_sync_count, 881 .status = disk_status, 882 }; 883 884 static int __init dm_dirty_log_init(void) 885 { 886 int r; 887 888 r = dm_dirty_log_type_register(&_core_type); 889 if (r) 890 DMWARN("couldn't register core log"); 891 892 r = dm_dirty_log_type_register(&_disk_type); 893 if (r) { 894 DMWARN("couldn't register disk type"); 895 dm_dirty_log_type_unregister(&_core_type); 896 } 897 898 return r; 899 } 900 901 static void __exit dm_dirty_log_exit(void) 902 { 903 dm_dirty_log_type_unregister(&_disk_type); 904 dm_dirty_log_type_unregister(&_core_type); 905 } 906 907 module_init(dm_dirty_log_init); 908 module_exit(dm_dirty_log_exit); 909 910 MODULE_DESCRIPTION(DM_NAME " dirty region log"); 911 MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); 912 MODULE_LICENSE("GPL"); 913