drivers/md/persistent-data/dm-space-map-common.c

   1 /*
   2  * Copyright (C) 2011 Red Hat, Inc.
   3  *
   4  * This file is released under the GPL.
   5  */
   6
   7 #include "dm-space-map-common.h"
   8 #include "dm-transaction-manager.h"
   9
  10 #include <linux/bitops.h>
  11 #include <linux/device-mapper.h>
  12
  13 #define DM_MSG_PREFIX "space map common"
  14
  15 /*----------------------------------------------------------------*/
  16
  17 /*
  18  * Index validator.
  19  */
  20 #define INDEX_CSUM_XOR 160478
  21
  22 static void index_prepare_for_write(struct dm_block_validator *v,
  23                                     struct dm_block *b,
  24                                     size_t block_size)
  25 {
  26         struct disk_metadata_index *mi_le = dm_block_data(b);
  27
  28         mi_le->blocknr = cpu_to_le64(dm_block_location(b));
  29         mi_le->csum = cpu_to_le32(dm_bm_checksum(&mi_le->padding,
  30                                                  block_size - sizeof(__le32),
  31                                                  INDEX_CSUM_XOR));
  32 }
  33
  34 static int index_check(struct dm_block_validator *v,
  35                        struct dm_block *b,
  36                        size_t block_size)
  37 {
  38         struct disk_metadata_index *mi_le = dm_block_data(b);
  39         __le32 csum_disk;
  40
  41         if (dm_block_location(b) != le64_to_cpu(mi_le->blocknr)) {
  42                 DMERR_LIMIT("index_check failed: blocknr %llu != wanted %llu",
  43                             le64_to_cpu(mi_le->blocknr), dm_block_location(b));
  44                 return -ENOTBLK;
  45         }
  46
  47         csum_disk = cpu_to_le32(dm_bm_checksum(&mi_le->padding,
  48                                                block_size - sizeof(__le32),
  49                                                INDEX_CSUM_XOR));
  50         if (csum_disk != mi_le->csum) {
  51                 DMERR_LIMIT("index_check failed: csum %u != wanted %u",
  52                             le32_to_cpu(csum_disk), le32_to_cpu(mi_le->csum));
  53                 return -EILSEQ;
  54         }
  55
  56         return 0;
  57 }
  58
  59 static struct dm_block_validator index_validator = {
  60         .name = "index",
  61         .prepare_for_write = index_prepare_for_write,
  62         .check = index_check
  63 };
  64
  65 /*----------------------------------------------------------------*/
  66
  67 /*
  68  * Bitmap validator
  69  */
  70 #define BITMAP_CSUM_XOR 240779
  71
  72 static void dm_bitmap_prepare_for_write(struct dm_block_validator *v,
  73                                         struct dm_block *b,
  74                                         size_t block_size)
  75 {
  76         struct disk_bitmap_header *disk_header = dm_block_data(b);
  77
  78         disk_header->blocknr = cpu_to_le64(dm_block_location(b));
  79         disk_header->csum = cpu_to_le32(dm_bm_checksum(&disk_header->not_used,
  80                                                        block_size - sizeof(__le32),
  81                                                        BITMAP_CSUM_XOR));
  82 }
  83
  84 static int dm_bitmap_check(struct dm_block_validator *v,
  85                            struct dm_block *b,
  86                            size_t block_size)
  87 {
  88         struct disk_bitmap_header *disk_header = dm_block_data(b);
  89         __le32 csum_disk;
  90
  91         if (dm_block_location(b) != le64_to_cpu(disk_header->blocknr)) {
  92                 DMERR_LIMIT("bitmap check failed: blocknr %llu != wanted %llu",
  93                             le64_to_cpu(disk_header->blocknr), dm_block_location(b));
  94                 return -ENOTBLK;
  95         }
  96
  97         csum_disk = cpu_to_le32(dm_bm_checksum(&disk_header->not_used,
  98                                                block_size - sizeof(__le32),
  99                                                BITMAP_CSUM_XOR));
 100         if (csum_disk != disk_header->csum) {
 101                 DMERR_LIMIT("bitmap check failed: csum %u != wanted %u",
 102                             le32_to_cpu(csum_disk), le32_to_cpu(disk_header->csum));
 103                 return -EILSEQ;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static struct dm_block_validator dm_sm_bitmap_validator = {
 110         .name = "sm_bitmap",
 111         .prepare_for_write = dm_bitmap_prepare_for_write,
 112         .check = dm_bitmap_check,
 113 };
 114
 115 /*----------------------------------------------------------------*/
 116
 117 #define ENTRIES_PER_WORD 32
 118 #define ENTRIES_SHIFT   5
 119
 120 static void *dm_bitmap_data(struct dm_block *b)
 121 {
 122         return dm_block_data(b) + sizeof(struct disk_bitmap_header);
 123 }
 124
 125 #define WORD_MASK_HIGH 0xAAAAAAAAAAAAAAAAULL
 126
 127 static unsigned dm_bitmap_word_used(void *addr, unsigned b)
 128 {
 129         __le64 *words_le = addr;
 130         __le64 *w_le = words_le + (b >> ENTRIES_SHIFT);
 131
 132         uint64_t bits = le64_to_cpu(*w_le);
 133         uint64_t mask = (bits + WORD_MASK_HIGH + 1) & WORD_MASK_HIGH;
 134
 135         return !(~bits & mask);
 136 }
 137
 138 static unsigned sm_lookup_bitmap(void *addr, unsigned b)
 139 {
 140         __le64 *words_le = addr;
 141         __le64 *w_le = words_le + (b >> ENTRIES_SHIFT);
 142         unsigned hi, lo;
 143
 144         b = (b & (ENTRIES_PER_WORD - 1)) << 1;
 145         hi = !!test_bit_le(b, (void *) w_le);
 146         lo = !!test_bit_le(b + 1, (void *) w_le);
 147         return (hi << 1) | lo;
 148 }
 149
 150 static void sm_set_bitmap(void *addr, unsigned b, unsigned val)
 151 {
 152         __le64 *words_le = addr;
 153         __le64 *w_le = words_le + (b >> ENTRIES_SHIFT);
 154
 155         b = (b & (ENTRIES_PER_WORD - 1)) << 1;
 156
 157         if (val & 2)
 158                 __set_bit_le(b, (void *) w_le);
 159         else
 160                 __clear_bit_le(b, (void *) w_le);
 161
 162         if (val & 1)
 163                 __set_bit_le(b + 1, (void *) w_le);
 164         else
 165                 __clear_bit_le(b + 1, (void *) w_le);
 166 }
 167
 168 static int sm_find_free(void *addr, unsigned begin, unsigned end,
 169                         unsigned *result)
 170 {
 171         while (begin < end) {
 172                 if (!(begin & (ENTRIES_PER_WORD - 1)) &&
 173                     dm_bitmap_word_used(addr, begin)) {
 174                         begin += ENTRIES_PER_WORD;
 175                         continue;
 176                 }
 177
 178                 if (!sm_lookup_bitmap(addr, begin)) {
 179                         *result = begin;
 180                         return 0;
 181                 }
 182
 183                 begin++;
 184         }
 185
 186         return -ENOSPC;
 187 }
 188
 189 /*----------------------------------------------------------------*/
 190
 191 static int sm_ll_init(struct ll_disk *ll, struct dm_transaction_manager *tm)
 192 {
 193         memset(ll, 0, sizeof(struct ll_disk));
 194
 195         ll->tm = tm;
 196
 197         ll->bitmap_info.tm = tm;
 198         ll->bitmap_info.levels = 1;
 199
 200         /*
 201          * Because the new bitmap blocks are created via a shadow
 202          * operation, the old entry has already had its reference count
 203          * decremented and we don't need the btree to do any bookkeeping.
 204          */
 205         ll->bitmap_info.value_type.size = sizeof(struct disk_index_entry);
 206         ll->bitmap_info.value_type.inc = NULL;
 207         ll->bitmap_info.value_type.dec = NULL;
 208         ll->bitmap_info.value_type.equal = NULL;
 209
 210         ll->ref_count_info.tm = tm;
 211         ll->ref_count_info.levels = 1;
 212         ll->ref_count_info.value_type.size = sizeof(uint32_t);
 213         ll->ref_count_info.value_type.inc = NULL;
 214         ll->ref_count_info.value_type.dec = NULL;
 215         ll->ref_count_info.value_type.equal = NULL;
 216
 217         ll->block_size = dm_bm_block_size(dm_tm_get_bm(tm));
 218
 219         if (ll->block_size > (1 << 30)) {
 220                 DMERR("block size too big to hold bitmaps");
 221                 return -EINVAL;
 222         }
 223
 224         ll->entries_per_block = (ll->block_size - sizeof(struct disk_bitmap_header)) *
 225                 ENTRIES_PER_BYTE;
 226         ll->nr_blocks = 0;
 227         ll->bitmap_root = 0;
 228         ll->ref_count_root = 0;
 229         ll->bitmap_index_changed = false;
 230
 231         return 0;
 232 }
 233
 234 int sm_ll_extend(struct ll_disk *ll, dm_block_t extra_blocks)
 235 {
 236         int r;
 237         dm_block_t i, nr_blocks, nr_indexes;
 238         unsigned old_blocks, blocks;
 239
 240         nr_blocks = ll->nr_blocks + extra_blocks;
 241         old_blocks = dm_sector_div_up(ll->nr_blocks, ll->entries_per_block);
 242         blocks = dm_sector_div_up(nr_blocks, ll->entries_per_block);
 243
 244         nr_indexes = dm_sector_div_up(nr_blocks, ll->entries_per_block);
 245         if (nr_indexes > ll->max_entries(ll)) {
 246                 DMERR("space map too large");
 247                 return -EINVAL;
 248         }
 249
 250         /*
 251          * We need to set this before the dm_tm_new_block() call below.
 252          */
 253         ll->nr_blocks = nr_blocks;
 254         for (i = old_blocks; i < blocks; i++) {
 255                 struct dm_block *b;
 256                 struct disk_index_entry idx;
 257
 258                 r = dm_tm_new_block(ll->tm, &dm_sm_bitmap_validator, &b);
 259                 if (r < 0)
 260                         return r;
 261
 262                 idx.blocknr = cpu_to_le64(dm_block_location(b));
 263
 264                 dm_tm_unlock(ll->tm, b);
 265
 266                 idx.nr_free = cpu_to_le32(ll->entries_per_block);
 267                 idx.none_free_before = 0;
 268
 269                 r = ll->save_ie(ll, i, &idx);
 270                 if (r < 0)
 271                         return r;
 272         }
 273
 274         return 0;
 275 }
 276
 277 int sm_ll_lookup_bitmap(struct ll_disk *ll, dm_block_t b, uint32_t *result)
 278 {
 279         int r;
 280         dm_block_t index = b;
 281         struct disk_index_entry ie_disk;
 282         struct dm_block *blk;
 283
 284         b = do_div(index, ll->entries_per_block);
 285         r = ll->load_ie(ll, index, &ie_disk);
 286         if (r < 0)
 287                 return r;
 288
 289         r = dm_tm_read_lock(ll->tm, le64_to_cpu(ie_disk.blocknr),
 290                             &dm_sm_bitmap_validator, &blk);
 291         if (r < 0)
 292                 return r;
 293
 294         *result = sm_lookup_bitmap(dm_bitmap_data(blk), b);
 295
 296         dm_tm_unlock(ll->tm, blk);
 297
 298         return 0;
 299 }
 300
 301 static int sm_ll_lookup_big_ref_count(struct ll_disk *ll, dm_block_t b,
 302                                       uint32_t *result)
 303 {
 304         __le32 le_rc;
 305         int r;
 306
 307         r = dm_btree_lookup(&ll->ref_count_info, ll->ref_count_root, &b, &le_rc);
 308         if (r < 0)
 309                 return r;
 310
 311         *result = le32_to_cpu(le_rc);
 312
 313         return r;
 314 }
 315
 316 int sm_ll_lookup(struct ll_disk *ll, dm_block_t b, uint32_t *result)
 317 {
 318         int r = sm_ll_lookup_bitmap(ll, b, result);
 319
 320         if (r)
 321                 return r;
 322
 323         if (*result != 3)
 324                 return r;
 325
 326         return sm_ll_lookup_big_ref_count(ll, b, result);
 327 }
 328
 329 int sm_ll_find_free_block(struct ll_disk *ll, dm_block_t begin,
 330                           dm_block_t end, dm_block_t *result)
 331 {
 332         int r;
 333         struct disk_index_entry ie_disk;
 334         dm_block_t i, index_begin = begin;
 335         dm_block_t index_end = dm_sector_div_up(end, ll->entries_per_block);
 336
 337         /*
 338          * FIXME: Use shifts
 339          */
 340         begin = do_div(index_begin, ll->entries_per_block);
 341         end = do_div(end, ll->entries_per_block);
 342
 343         for (i = index_begin; i < index_end; i++, begin = 0) {
 344                 struct dm_block *blk;
 345                 unsigned position;
 346                 uint32_t bit_end;
 347
 348                 r = ll->load_ie(ll, i, &ie_disk);
 349                 if (r < 0)
 350                         return r;
 351
 352                 if (le32_to_cpu(ie_disk.nr_free) == 0)
 353                         continue;
 354
 355                 r = dm_tm_read_lock(ll->tm, le64_to_cpu(ie_disk.blocknr),
 356                                     &dm_sm_bitmap_validator, &blk);
 357                 if (r < 0)
 358                         return r;
 359
 360                 bit_end = (i == index_end - 1) ?  end : ll->entries_per_block;
 361
 362                 r = sm_find_free(dm_bitmap_data(blk),
 363                                  max_t(unsigned, begin, le32_to_cpu(ie_disk.none_free_before)),
 364                                  bit_end, &position);
 365                 if (r == -ENOSPC) {
 366                         /*
 367                          * This might happen because we started searching
 368                          * part way through the bitmap.
 369                          */
 370                         dm_tm_unlock(ll->tm, blk);
 371                         continue;
 372                 }
 373
 374                 dm_tm_unlock(ll->tm, blk);
 375
 376                 *result = i * ll->entries_per_block + (dm_block_t) position;
 377                 return 0;
 378         }
 379
 380         return -ENOSPC;
 381 }
 382
 383 int sm_ll_find_common_free_block(struct ll_disk *old_ll, struct ll_disk *new_ll,
 384                                  dm_block_t begin, dm_block_t end, dm_block_t *b)
 385 {
 386         int r;
 387         uint32_t count;
 388
 389         do {
 390                 r = sm_ll_find_free_block(new_ll, begin, new_ll->nr_blocks, b);
 391                 if (r)
 392                         break;
 393
 394                 /* double check this block wasn't used in the old transaction */
 395                 if (*b >= old_ll->nr_blocks)
 396                         count = 0;
 397                 else {
 398                         r = sm_ll_lookup(old_ll, *b, &count);
 399                         if (r)
 400                                 break;
 401
 402                         if (count)
 403                                 begin = *b + 1;
 404                 }
 405         } while (count);
 406
 407         return r;
 408 }
 409
 410 static int sm_ll_mutate(struct ll_disk *ll, dm_block_t b,
 411                         int (*mutator)(void *context, uint32_t old, uint32_t *new),
 412                         void *context, enum allocation_event *ev)
 413 {
 414         int r;
 415         uint32_t bit, old, ref_count;
 416         struct dm_block *nb;
 417         dm_block_t index = b;
 418         struct disk_index_entry ie_disk;
 419         void *bm_le;
 420         int inc;
 421
 422         bit = do_div(index, ll->entries_per_block);
 423         r = ll->load_ie(ll, index, &ie_disk);
 424         if (r < 0)
 425                 return r;
 426
 427         r = dm_tm_shadow_block(ll->tm, le64_to_cpu(ie_disk.blocknr),
 428                                &dm_sm_bitmap_validator, &nb, &inc);
 429         if (r < 0) {
 430                 DMERR("dm_tm_shadow_block() failed");
 431                 return r;
 432         }
 433         ie_disk.blocknr = cpu_to_le64(dm_block_location(nb));
 434
 435         bm_le = dm_bitmap_data(nb);
 436         old = sm_lookup_bitmap(bm_le, bit);
 437
 438         if (old > 2) {
 439                 r = sm_ll_lookup_big_ref_count(ll, b, &old);
 440                 if (r < 0) {
 441                         dm_tm_unlock(ll->tm, nb);
 442                         return r;
 443                 }
 444         }
 445
 446         r = mutator(context, old, &ref_count);
 447         if (r) {
 448                 dm_tm_unlock(ll->tm, nb);
 449                 return r;
 450         }
 451
 452         if (ref_count <= 2) {
 453                 sm_set_bitmap(bm_le, bit, ref_count);
 454
 455                 dm_tm_unlock(ll->tm, nb);
 456
 457                 if (old > 2) {
 458                         r = dm_btree_remove(&ll->ref_count_info,
 459                                             ll->ref_count_root,
 460                                             &b, &ll->ref_count_root);
 461                         if (r)
 462                                 return r;
 463                 }
 464
 465         } else {
 466                 __le32 le_rc = cpu_to_le32(ref_count);
 467
 468                 sm_set_bitmap(bm_le, bit, 3);
 469                 dm_tm_unlock(ll->tm, nb);
 470
 471                 __dm_bless_for_disk(&le_rc);
 472                 r = dm_btree_insert(&ll->ref_count_info, ll->ref_count_root,
 473                                     &b, &le_rc, &ll->ref_count_root);
 474                 if (r < 0) {
 475                         DMERR("ref count insert failed");
 476                         return r;
 477                 }
 478         }
 479
 480         if (ref_count && !old) {
 481                 *ev = SM_ALLOC;
 482                 ll->nr_allocated++;
 483                 le32_add_cpu(&ie_disk.nr_free, -1);
 484                 if (le32_to_cpu(ie_disk.none_free_before) == bit)
 485                         ie_disk.none_free_before = cpu_to_le32(bit + 1);
 486
 487         } else if (old && !ref_count) {
 488                 *ev = SM_FREE;
 489                 ll->nr_allocated--;
 490                 le32_add_cpu(&ie_disk.nr_free, 1);
 491                 ie_disk.none_free_before = cpu_to_le32(min(le32_to_cpu(ie_disk.none_free_before), bit));
 492         } else
 493                 *ev = SM_NONE;
 494
 495         return ll->save_ie(ll, index, &ie_disk);
 496 }
 497
 498 static int set_ref_count(void *context, uint32_t old, uint32_t *new)
 499 {
 500         *new = *((uint32_t *) context);
 501         return 0;
 502 }
 503
 504 int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
 505                  uint32_t ref_count, enum allocation_event *ev)
 506 {
 507         return sm_ll_mutate(ll, b, set_ref_count, &ref_count, ev);
 508 }
 509
 510 static int inc_ref_count(void *context, uint32_t old, uint32_t *new)
 511 {
 512         *new = old + 1;
 513         return 0;
 514 }
 515
 516 int sm_ll_inc(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
 517 {
 518         return sm_ll_mutate(ll, b, inc_ref_count, NULL, ev);
 519 }
 520
 521 static int dec_ref_count(void *context, uint32_t old, uint32_t *new)
 522 {
 523         if (!old) {
 524                 DMERR_LIMIT("unable to decrement a reference count below 0");
 525                 return -EINVAL;
 526         }
 527
 528         *new = old - 1;
 529         return 0;
 530 }
 531
 532 int sm_ll_dec(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
 533 {
 534         return sm_ll_mutate(ll, b, dec_ref_count, NULL, ev);
 535 }
 536
 537 int sm_ll_commit(struct ll_disk *ll)
 538 {
 539         int r = 0;
 540
 541         if (ll->bitmap_index_changed) {
 542                 r = ll->commit(ll);
 543                 if (!r)
 544                         ll->bitmap_index_changed = false;
 545         }
 546
 547         return r;
 548 }
 549
 550 /*----------------------------------------------------------------*/
 551
 552 static int metadata_ll_load_ie(struct ll_disk *ll, dm_block_t index,
 553                                struct disk_index_entry *ie)
 554 {
 555         memcpy(ie, ll->mi_le.index + index, sizeof(*ie));
 556         return 0;
 557 }
 558
 559 static int metadata_ll_save_ie(struct ll_disk *ll, dm_block_t index,
 560                                struct disk_index_entry *ie)
 561 {
 562         ll->bitmap_index_changed = true;
 563         memcpy(ll->mi_le.index + index, ie, sizeof(*ie));
 564         return 0;
 565 }
 566
 567 static int metadata_ll_init_index(struct ll_disk *ll)
 568 {
 569         int r;
 570         struct dm_block *b;
 571
 572         r = dm_tm_new_block(ll->tm, &index_validator, &b);
 573         if (r < 0)
 574                 return r;
 575
 576         ll->bitmap_root = dm_block_location(b);
 577
 578         dm_tm_unlock(ll->tm, b);
 579
 580         return 0;
 581 }
 582
 583 static int metadata_ll_open(struct ll_disk *ll)
 584 {
 585         int r;
 586         struct dm_block *block;
 587
 588         r = dm_tm_read_lock(ll->tm, ll->bitmap_root,
 589                             &index_validator, &block);
 590         if (r)
 591                 return r;
 592
 593         memcpy(&ll->mi_le, dm_block_data(block), sizeof(ll->mi_le));
 594         dm_tm_unlock(ll->tm, block);
 595
 596         return 0;
 597 }
 598
 599 static dm_block_t metadata_ll_max_entries(struct ll_disk *ll)
 600 {
 601         return MAX_METADATA_BITMAPS;
 602 }
 603
 604 static int metadata_ll_commit(struct ll_disk *ll)
 605 {
 606         int r, inc;
 607         struct dm_block *b;
 608
 609         r = dm_tm_shadow_block(ll->tm, ll->bitmap_root, &index_validator, &b, &inc);
 610         if (r)
 611                 return r;
 612
 613         memcpy(dm_block_data(b), &ll->mi_le, sizeof(ll->mi_le));
 614         ll->bitmap_root = dm_block_location(b);
 615
 616         dm_tm_unlock(ll->tm, b);
 617
 618         return 0;
 619 }
 620
 621 int sm_ll_new_metadata(struct ll_disk *ll, struct dm_transaction_manager *tm)
 622 {
 623         int r;
 624
 625         r = sm_ll_init(ll, tm);
 626         if (r < 0)
 627                 return r;
 628
 629         ll->load_ie = metadata_ll_load_ie;
 630         ll->save_ie = metadata_ll_save_ie;
 631         ll->init_index = metadata_ll_init_index;
 632         ll->open_index = metadata_ll_open;
 633         ll->max_entries = metadata_ll_max_entries;
 634         ll->commit = metadata_ll_commit;
 635
 636         ll->nr_blocks = 0;
 637         ll->nr_allocated = 0;
 638
 639         r = ll->init_index(ll);
 640         if (r < 0)
 641                 return r;
 642
 643         r = dm_btree_empty(&ll->ref_count_info, &ll->ref_count_root);
 644         if (r < 0)
 645                 return r;
 646
 647         return 0;
 648 }
 649
 650 int sm_ll_open_metadata(struct ll_disk *ll, struct dm_transaction_manager *tm,
 651                         void *root_le, size_t len)
 652 {
 653         int r;
 654         struct disk_sm_root smr;
 655
 656         if (len < sizeof(struct disk_sm_root)) {
 657                 DMERR("sm_metadata root too small");
 658                 return -ENOMEM;
 659         }
 660
 661         /*
 662          * We don't know the alignment of the root_le buffer, so need to
 663          * copy into a new structure.
 664          */
 665         memcpy(&smr, root_le, sizeof(smr));
 666
 667         r = sm_ll_init(ll, tm);
 668         if (r < 0)
 669                 return r;
 670
 671         ll->load_ie = metadata_ll_load_ie;
 672         ll->save_ie = metadata_ll_save_ie;
 673         ll->init_index = metadata_ll_init_index;
 674         ll->open_index = metadata_ll_open;
 675         ll->max_entries = metadata_ll_max_entries;
 676         ll->commit = metadata_ll_commit;
 677
 678         ll->nr_blocks = le64_to_cpu(smr.nr_blocks);
 679         ll->nr_allocated = le64_to_cpu(smr.nr_allocated);
 680         ll->bitmap_root = le64_to_cpu(smr.bitmap_root);
 681         ll->ref_count_root = le64_to_cpu(smr.ref_count_root);
 682
 683         return ll->open_index(ll);
 684 }
 685
 686 /*----------------------------------------------------------------*/
 687
 688 static int disk_ll_load_ie(struct ll_disk *ll, dm_block_t index,
 689                            struct disk_index_entry *ie)
 690 {
 691         return dm_btree_lookup(&ll->bitmap_info, ll->bitmap_root, &index, ie);
 692 }
 693
 694 static int disk_ll_save_ie(struct ll_disk *ll, dm_block_t index,
 695                            struct disk_index_entry *ie)
 696 {
 697         __dm_bless_for_disk(ie);
 698         return dm_btree_insert(&ll->bitmap_info, ll->bitmap_root,
 699                                &index, ie, &ll->bitmap_root);
 700 }
 701
 702 static int disk_ll_init_index(struct ll_disk *ll)
 703 {
 704         return dm_btree_empty(&ll->bitmap_info, &ll->bitmap_root);
 705 }
 706
 707 static int disk_ll_open(struct ll_disk *ll)
 708 {
 709         /* nothing to do */
 710         return 0;
 711 }
 712
 713 static dm_block_t disk_ll_max_entries(struct ll_disk *ll)
 714 {
 715         return -1ULL;
 716 }
 717
 718 static int disk_ll_commit(struct ll_disk *ll)
 719 {
 720         return 0;
 721 }
 722
 723 int sm_ll_new_disk(struct ll_disk *ll, struct dm_transaction_manager *tm)
 724 {
 725         int r;
 726
 727         r = sm_ll_init(ll, tm);
 728         if (r < 0)
 729                 return r;
 730
 731         ll->load_ie = disk_ll_load_ie;
 732         ll->save_ie = disk_ll_save_ie;
 733         ll->init_index = disk_ll_init_index;
 734         ll->open_index = disk_ll_open;
 735         ll->max_entries = disk_ll_max_entries;
 736         ll->commit = disk_ll_commit;
 737
 738         ll->nr_blocks = 0;
 739         ll->nr_allocated = 0;
 740
 741         r = ll->init_index(ll);
 742         if (r < 0)
 743                 return r;
 744
 745         r = dm_btree_empty(&ll->ref_count_info, &ll->ref_count_root);
 746         if (r < 0)
 747                 return r;
 748
 749         return 0;
 750 }
 751
 752 int sm_ll_open_disk(struct ll_disk *ll, struct dm_transaction_manager *tm,
 753                     void *root_le, size_t len)
 754 {
 755         int r;
 756         struct disk_sm_root *smr = root_le;
 757
 758         if (len < sizeof(struct disk_sm_root)) {
 759                 DMERR("sm_metadata root too small");
 760                 return -ENOMEM;
 761         }
 762
 763         r = sm_ll_init(ll, tm);
 764         if (r < 0)
 765                 return r;
 766
 767         ll->load_ie = disk_ll_load_ie;
 768         ll->save_ie = disk_ll_save_ie;
 769         ll->init_index = disk_ll_init_index;
 770         ll->open_index = disk_ll_open;
 771         ll->max_entries = disk_ll_max_entries;
 772         ll->commit = disk_ll_commit;
 773
 774         ll->nr_blocks = le64_to_cpu(smr->nr_blocks);
 775         ll->nr_allocated = le64_to_cpu(smr->nr_allocated);
 776         ll->bitmap_root = le64_to_cpu(smr->bitmap_root);
 777         ll->ref_count_root = le64_to_cpu(smr->ref_count_root);
 778
 779         return ll->open_index(ll);
 780 }
 781
 782 /*----------------------------------------------------------------*/