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 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 } 301 302 static 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 } 315 316 static 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 } 345 346 static 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 3 363 static 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, 419 sizeof(*lc->clean_bits) << BYTE_SHIFT); 420 bitset_size >>= BYTE_SHIFT; 421 422 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); 423 424 /* 425 * Disk log? 426 */ 427 if (!dev) { 428 lc->clean_bits = vmalloc(bitset_size); 429 if (!lc->clean_bits) { 430 DMWARN("couldn't allocate clean bitset"); 431 kfree(lc); 432 return -ENOMEM; 433 } 434 lc->disk_header = NULL; 435 } else { 436 lc->log_dev = dev; 437 lc->log_dev_failed = 0; 438 lc->log_dev_flush_failed = 0; 439 lc->header_location.bdev = lc->log_dev->bdev; 440 lc->header_location.sector = 0; 441 442 /* 443 * Buffer holds both header and bitset. 444 */ 445 buf_size = 446 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, 447 bdev_logical_block_size(lc->header_location. 448 bdev)); 449 450 if (buf_size > bdev_nr_bytes(dev->bdev)) { 451 DMWARN("log device %s too small: need %llu bytes", 452 dev->name, (unsigned long long)buf_size); 453 kfree(lc); 454 return -EINVAL; 455 } 456 457 lc->header_location.count = buf_size >> SECTOR_SHIFT; 458 459 lc->io_req.mem.type = DM_IO_VMA; 460 lc->io_req.notify.fn = NULL; 461 lc->io_req.client = dm_io_client_create(); 462 if (IS_ERR(lc->io_req.client)) { 463 r = PTR_ERR(lc->io_req.client); 464 DMWARN("couldn't allocate disk io client"); 465 kfree(lc); 466 return r; 467 } 468 469 lc->disk_header = vmalloc(buf_size); 470 if (!lc->disk_header) { 471 DMWARN("couldn't allocate disk log buffer"); 472 dm_io_client_destroy(lc->io_req.client); 473 kfree(lc); 474 return -ENOMEM; 475 } 476 477 lc->io_req.mem.ptr.vma = lc->disk_header; 478 lc->clean_bits = (void *)lc->disk_header + 479 (LOG_OFFSET << SECTOR_SHIFT); 480 } 481 482 memset(lc->clean_bits, -1, bitset_size); 483 484 lc->sync_bits = vmalloc(bitset_size); 485 if (!lc->sync_bits) { 486 DMWARN("couldn't allocate sync bitset"); 487 if (!dev) 488 vfree(lc->clean_bits); 489 else 490 dm_io_client_destroy(lc->io_req.client); 491 vfree(lc->disk_header); 492 kfree(lc); 493 return -ENOMEM; 494 } 495 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); 496 lc->sync_count = (sync == NOSYNC) ? region_count : 0; 497 498 lc->recovering_bits = vzalloc(bitset_size); 499 if (!lc->recovering_bits) { 500 DMWARN("couldn't allocate sync bitset"); 501 vfree(lc->sync_bits); 502 if (!dev) 503 vfree(lc->clean_bits); 504 else 505 dm_io_client_destroy(lc->io_req.client); 506 vfree(lc->disk_header); 507 kfree(lc); 508 return -ENOMEM; 509 } 510 lc->sync_search = 0; 511 log->context = lc; 512 513 return 0; 514 } 515 516 static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, 517 unsigned int argc, char **argv) 518 { 519 return create_log_context(log, ti, argc, argv, NULL); 520 } 521 522 static void destroy_log_context(struct log_c *lc) 523 { 524 vfree(lc->sync_bits); 525 vfree(lc->recovering_bits); 526 kfree(lc); 527 } 528 529 static void core_dtr(struct dm_dirty_log *log) 530 { 531 struct log_c *lc = (struct log_c *) log->context; 532 533 vfree(lc->clean_bits); 534 destroy_log_context(lc); 535 } 536 537 /*---------------------------------------------------------------- 538 * disk log constructor/destructor 539 * 540 * argv contains log_device region_size followed optionally by [no]sync 541 *--------------------------------------------------------------*/ 542 static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, 543 unsigned int argc, char **argv) 544 { 545 int r; 546 struct dm_dev *dev; 547 548 if (argc < 2 || argc > 3) { 549 DMWARN("wrong number of arguments to disk dirty region log"); 550 return -EINVAL; 551 } 552 553 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); 554 if (r) 555 return r; 556 557 r = create_log_context(log, ti, argc - 1, argv + 1, dev); 558 if (r) { 559 dm_put_device(ti, dev); 560 return r; 561 } 562 563 return 0; 564 } 565 566 static void disk_dtr(struct dm_dirty_log *log) 567 { 568 struct log_c *lc = (struct log_c *) log->context; 569 570 dm_put_device(lc->ti, lc->log_dev); 571 vfree(lc->disk_header); 572 dm_io_client_destroy(lc->io_req.client); 573 destroy_log_context(lc); 574 } 575 576 static void fail_log_device(struct log_c *lc) 577 { 578 if (lc->log_dev_failed) 579 return; 580 581 lc->log_dev_failed = 1; 582 dm_table_event(lc->ti->table); 583 } 584 585 static int disk_resume(struct dm_dirty_log *log) 586 { 587 int r; 588 unsigned i; 589 struct log_c *lc = (struct log_c *) log->context; 590 size_t size = lc->bitset_uint32_count * sizeof(uint32_t); 591 592 /* read the disk header */ 593 r = read_header(lc); 594 if (r) { 595 DMWARN("%s: Failed to read header on dirty region log device", 596 lc->log_dev->name); 597 fail_log_device(lc); 598 /* 599 * If the log device cannot be read, we must assume 600 * all regions are out-of-sync. If we simply return 601 * here, the state will be uninitialized and could 602 * lead us to return 'in-sync' status for regions 603 * that are actually 'out-of-sync'. 604 */ 605 lc->header.nr_regions = 0; 606 } 607 608 /* set or clear any new bits -- device has grown */ 609 if (lc->sync == NOSYNC) 610 for (i = lc->header.nr_regions; i < lc->region_count; i++) 611 /* FIXME: amazingly inefficient */ 612 log_set_bit(lc, lc->clean_bits, i); 613 else 614 for (i = lc->header.nr_regions; i < lc->region_count; i++) 615 /* FIXME: amazingly inefficient */ 616 log_clear_bit(lc, lc->clean_bits, i); 617 618 /* clear any old bits -- device has shrunk */ 619 for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) 620 log_clear_bit(lc, lc->clean_bits, i); 621 622 /* copy clean across to sync */ 623 memcpy(lc->sync_bits, lc->clean_bits, size); 624 lc->sync_count = memweight(lc->clean_bits, 625 lc->bitset_uint32_count * sizeof(uint32_t)); 626 lc->sync_search = 0; 627 628 /* set the correct number of regions in the header */ 629 lc->header.nr_regions = lc->region_count; 630 631 header_to_disk(&lc->header, lc->disk_header); 632 633 /* write the new header */ 634 r = rw_header(lc, REQ_OP_WRITE); 635 if (!r) { 636 r = flush_header(lc); 637 if (r) 638 lc->log_dev_flush_failed = 1; 639 } 640 if (r) { 641 DMWARN("%s: Failed to write header on dirty region log device", 642 lc->log_dev->name); 643 fail_log_device(lc); 644 } 645 646 return r; 647 } 648 649 static uint32_t core_get_region_size(struct dm_dirty_log *log) 650 { 651 struct log_c *lc = (struct log_c *) log->context; 652 return lc->region_size; 653 } 654 655 static int core_resume(struct dm_dirty_log *log) 656 { 657 struct log_c *lc = (struct log_c *) log->context; 658 lc->sync_search = 0; 659 return 0; 660 } 661 662 static int core_is_clean(struct dm_dirty_log *log, region_t region) 663 { 664 struct log_c *lc = (struct log_c *) log->context; 665 return log_test_bit(lc->clean_bits, region); 666 } 667 668 static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) 669 { 670 struct log_c *lc = (struct log_c *) log->context; 671 return log_test_bit(lc->sync_bits, region); 672 } 673 674 static int core_flush(struct dm_dirty_log *log) 675 { 676 /* no op */ 677 return 0; 678 } 679 680 static int disk_flush(struct dm_dirty_log *log) 681 { 682 int r, i; 683 struct log_c *lc = log->context; 684 685 /* only write if the log has changed */ 686 if (!lc->touched_cleaned && !lc->touched_dirtied) 687 return 0; 688 689 if (lc->touched_cleaned && log->flush_callback_fn && 690 log->flush_callback_fn(lc->ti)) { 691 /* 692 * At this point it is impossible to determine which 693 * regions are clean and which are dirty (without 694 * re-reading the log off disk). So mark all of them 695 * dirty. 696 */ 697 lc->flush_failed = 1; 698 for (i = 0; i < lc->region_count; i++) 699 log_clear_bit(lc, lc->clean_bits, i); 700 } 701 702 r = rw_header(lc, REQ_OP_WRITE); 703 if (r) 704 fail_log_device(lc); 705 else { 706 if (lc->touched_dirtied) { 707 r = flush_header(lc); 708 if (r) { 709 lc->log_dev_flush_failed = 1; 710 fail_log_device(lc); 711 } else 712 lc->touched_dirtied = 0; 713 } 714 lc->touched_cleaned = 0; 715 } 716 717 return r; 718 } 719 720 static void core_mark_region(struct dm_dirty_log *log, region_t region) 721 { 722 struct log_c *lc = (struct log_c *) log->context; 723 log_clear_bit(lc, lc->clean_bits, region); 724 } 725 726 static void core_clear_region(struct dm_dirty_log *log, region_t region) 727 { 728 struct log_c *lc = (struct log_c *) log->context; 729 if (likely(!lc->flush_failed)) 730 log_set_bit(lc, lc->clean_bits, region); 731 } 732 733 static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) 734 { 735 struct log_c *lc = (struct log_c *) log->context; 736 737 if (lc->sync_search >= lc->region_count) 738 return 0; 739 740 do { 741 *region = find_next_zero_bit_le(lc->sync_bits, 742 lc->region_count, 743 lc->sync_search); 744 lc->sync_search = *region + 1; 745 746 if (*region >= lc->region_count) 747 return 0; 748 749 } while (log_test_bit(lc->recovering_bits, *region)); 750 751 log_set_bit(lc, lc->recovering_bits, *region); 752 return 1; 753 } 754 755 static void core_set_region_sync(struct dm_dirty_log *log, region_t region, 756 int in_sync) 757 { 758 struct log_c *lc = (struct log_c *) log->context; 759 760 log_clear_bit(lc, lc->recovering_bits, region); 761 if (in_sync) { 762 log_set_bit(lc, lc->sync_bits, region); 763 lc->sync_count++; 764 } else if (log_test_bit(lc->sync_bits, region)) { 765 lc->sync_count--; 766 log_clear_bit(lc, lc->sync_bits, region); 767 } 768 } 769 770 static region_t core_get_sync_count(struct dm_dirty_log *log) 771 { 772 struct log_c *lc = (struct log_c *) log->context; 773 774 return lc->sync_count; 775 } 776 777 #define DMEMIT_SYNC \ 778 if (lc->sync != DEFAULTSYNC) \ 779 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") 780 781 static int core_status(struct dm_dirty_log *log, status_type_t status, 782 char *result, unsigned int maxlen) 783 { 784 int sz = 0; 785 struct log_c *lc = log->context; 786 787 switch(status) { 788 case STATUSTYPE_INFO: 789 DMEMIT("1 %s", log->type->name); 790 break; 791 792 case STATUSTYPE_TABLE: 793 DMEMIT("%s %u %u ", log->type->name, 794 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); 795 DMEMIT_SYNC; 796 break; 797 798 case STATUSTYPE_IMA: 799 *result = '\0'; 800 break; 801 } 802 803 return sz; 804 } 805 806 static int disk_status(struct dm_dirty_log *log, status_type_t status, 807 char *result, unsigned int maxlen) 808 { 809 int sz = 0; 810 struct log_c *lc = log->context; 811 812 switch(status) { 813 case STATUSTYPE_INFO: 814 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, 815 lc->log_dev_flush_failed ? 'F' : 816 lc->log_dev_failed ? 'D' : 817 'A'); 818 break; 819 820 case STATUSTYPE_TABLE: 821 DMEMIT("%s %u %s %u ", log->type->name, 822 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, 823 lc->region_size); 824 DMEMIT_SYNC; 825 break; 826 827 case STATUSTYPE_IMA: 828 *result = '\0'; 829 break; 830 } 831 832 return sz; 833 } 834 835 static struct dm_dirty_log_type _core_type = { 836 .name = "core", 837 .module = THIS_MODULE, 838 .ctr = core_ctr, 839 .dtr = core_dtr, 840 .resume = core_resume, 841 .get_region_size = core_get_region_size, 842 .is_clean = core_is_clean, 843 .in_sync = core_in_sync, 844 .flush = core_flush, 845 .mark_region = core_mark_region, 846 .clear_region = core_clear_region, 847 .get_resync_work = core_get_resync_work, 848 .set_region_sync = core_set_region_sync, 849 .get_sync_count = core_get_sync_count, 850 .status = core_status, 851 }; 852 853 static struct dm_dirty_log_type _disk_type = { 854 .name = "disk", 855 .module = THIS_MODULE, 856 .ctr = disk_ctr, 857 .dtr = disk_dtr, 858 .postsuspend = disk_flush, 859 .resume = disk_resume, 860 .get_region_size = core_get_region_size, 861 .is_clean = core_is_clean, 862 .in_sync = core_in_sync, 863 .flush = disk_flush, 864 .mark_region = core_mark_region, 865 .clear_region = core_clear_region, 866 .get_resync_work = core_get_resync_work, 867 .set_region_sync = core_set_region_sync, 868 .get_sync_count = core_get_sync_count, 869 .status = disk_status, 870 }; 871 872 static int __init dm_dirty_log_init(void) 873 { 874 int r; 875 876 r = dm_dirty_log_type_register(&_core_type); 877 if (r) 878 DMWARN("couldn't register core log"); 879 880 r = dm_dirty_log_type_register(&_disk_type); 881 if (r) { 882 DMWARN("couldn't register disk type"); 883 dm_dirty_log_type_unregister(&_core_type); 884 } 885 886 return r; 887 } 888 889 static void __exit dm_dirty_log_exit(void) 890 { 891 dm_dirty_log_type_unregister(&_disk_type); 892 dm_dirty_log_type_unregister(&_core_type); 893 } 894 895 module_init(dm_dirty_log_init); 896 module_exit(dm_dirty_log_exit); 897 898 MODULE_DESCRIPTION(DM_NAME " dirty region log"); 899 MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); 900 MODULE_LICENSE("GPL"); 901