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 static int sm_ll_mutate(struct ll_disk *ll, dm_block_t b,
 384                         int (*mutator)(void *context, uint32_t old, uint32_t *new),
 385                         void *context, enum allocation_event *ev)
 386 {
 387         int r;
 388         uint32_t bit, old, ref_count;
 389         struct dm_block *nb;
 390         dm_block_t index = b;
 391         struct disk_index_entry ie_disk;
 392         void *bm_le;
 393         int inc;
 394
 395         bit = do_div(index, ll->entries_per_block);
 396         r = ll->load_ie(ll, index, &ie_disk);
 397         if (r < 0)
 398                 return r;
 399
 400         r = dm_tm_shadow_block(ll->tm, le64_to_cpu(ie_disk.blocknr),
 401                                &dm_sm_bitmap_validator, &nb, &inc);
 402         if (r < 0) {
 403                 DMERR("dm_tm_shadow_block() failed");
 404                 return r;
 405         }
 406         ie_disk.blocknr = cpu_to_le64(dm_block_location(nb));
 407
 408         bm_le = dm_bitmap_data(nb);
 409         old = sm_lookup_bitmap(bm_le, bit);
 410
 411         if (old > 2) {
 412                 r = sm_ll_lookup_big_ref_count(ll, b, &old);
 413                 if (r < 0) {
 414                         dm_tm_unlock(ll->tm, nb);
 415                         return r;
 416                 }
 417         }
 418
 419         r = mutator(context, old, &ref_count);
 420         if (r) {
 421                 dm_tm_unlock(ll->tm, nb);
 422                 return r;
 423         }
 424
 425         if (ref_count <= 2) {
 426                 sm_set_bitmap(bm_le, bit, ref_count);
 427
 428                 dm_tm_unlock(ll->tm, nb);
 429
 430                 if (old > 2) {
 431                         r = dm_btree_remove(&ll->ref_count_info,
 432                                             ll->ref_count_root,
 433                                             &b, &ll->ref_count_root);
 434                         if (r)
 435                                 return r;
 436                 }
 437
 438         } else {
 439                 __le32 le_rc = cpu_to_le32(ref_count);
 440
 441                 sm_set_bitmap(bm_le, bit, 3);
 442                 dm_tm_unlock(ll->tm, nb);
 443
 444                 __dm_bless_for_disk(&le_rc);
 445                 r = dm_btree_insert(&ll->ref_count_info, ll->ref_count_root,
 446                                     &b, &le_rc, &ll->ref_count_root);
 447                 if (r < 0) {
 448                         DMERR("ref count insert failed");
 449                         return r;
 450                 }
 451         }
 452
 453         if (ref_count && !old) {
 454                 *ev = SM_ALLOC;
 455                 ll->nr_allocated++;
 456                 le32_add_cpu(&ie_disk.nr_free, -1);
 457                 if (le32_to_cpu(ie_disk.none_free_before) == bit)
 458                         ie_disk.none_free_before = cpu_to_le32(bit + 1);
 459
 460         } else if (old && !ref_count) {
 461                 *ev = SM_FREE;
 462                 ll->nr_allocated--;
 463                 le32_add_cpu(&ie_disk.nr_free, 1);
 464                 ie_disk.none_free_before = cpu_to_le32(min(le32_to_cpu(ie_disk.none_free_before), bit));
 465         } else
 466                 *ev = SM_NONE;
 467
 468         return ll->save_ie(ll, index, &ie_disk);
 469 }
 470
 471 static int set_ref_count(void *context, uint32_t old, uint32_t *new)
 472 {
 473         *new = *((uint32_t *) context);
 474         return 0;
 475 }
 476
 477 int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
 478                  uint32_t ref_count, enum allocation_event *ev)
 479 {
 480         return sm_ll_mutate(ll, b, set_ref_count, &ref_count, ev);
 481 }
 482
 483 static int inc_ref_count(void *context, uint32_t old, uint32_t *new)
 484 {
 485         *new = old + 1;
 486         return 0;
 487 }
 488
 489 int sm_ll_inc(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
 490 {
 491         return sm_ll_mutate(ll, b, inc_ref_count, NULL, ev);
 492 }
 493
 494 static int dec_ref_count(void *context, uint32_t old, uint32_t *new)
 495 {
 496         if (!old) {
 497                 DMERR_LIMIT("unable to decrement a reference count below 0");
 498                 return -EINVAL;
 499         }
 500
 501         *new = old - 1;
 502         return 0;
 503 }
 504
 505 int sm_ll_dec(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
 506 {
 507         return sm_ll_mutate(ll, b, dec_ref_count, NULL, ev);
 508 }
 509
 510 int sm_ll_commit(struct ll_disk *ll)
 511 {
 512         int r = 0;
 513
 514         if (ll->bitmap_index_changed) {
 515                 r = ll->commit(ll);
 516                 if (!r)
 517                         ll->bitmap_index_changed = false;
 518         }
 519
 520         return r;
 521 }
 522
 523 /*----------------------------------------------------------------*/
 524
 525 static int metadata_ll_load_ie(struct ll_disk *ll, dm_block_t index,
 526                                struct disk_index_entry *ie)
 527 {
 528         memcpy(ie, ll->mi_le.index + index, sizeof(*ie));
 529         return 0;
 530 }
 531
 532 static int metadata_ll_save_ie(struct ll_disk *ll, dm_block_t index,
 533                                struct disk_index_entry *ie)
 534 {
 535         ll->bitmap_index_changed = true;
 536         memcpy(ll->mi_le.index + index, ie, sizeof(*ie));
 537         return 0;
 538 }
 539
 540 static int metadata_ll_init_index(struct ll_disk *ll)
 541 {
 542         int r;
 543         struct dm_block *b;
 544
 545         r = dm_tm_new_block(ll->tm, &index_validator, &b);
 546         if (r < 0)
 547                 return r;
 548
 549         ll->bitmap_root = dm_block_location(b);
 550
 551         dm_tm_unlock(ll->tm, b);
 552
 553         return 0;
 554 }
 555
 556 static int metadata_ll_open(struct ll_disk *ll)
 557 {
 558         int r;
 559         struct dm_block *block;
 560
 561         r = dm_tm_read_lock(ll->tm, ll->bitmap_root,
 562                             &index_validator, &block);
 563         if (r)
 564                 return r;
 565
 566         memcpy(&ll->mi_le, dm_block_data(block), sizeof(ll->mi_le));
 567         dm_tm_unlock(ll->tm, block);
 568
 569         return 0;
 570 }
 571
 572 static dm_block_t metadata_ll_max_entries(struct ll_disk *ll)
 573 {
 574         return MAX_METADATA_BITMAPS;
 575 }
 576
 577 static int metadata_ll_commit(struct ll_disk *ll)
 578 {
 579         int r, inc;
 580         struct dm_block *b;
 581
 582         r = dm_tm_shadow_block(ll->tm, ll->bitmap_root, &index_validator, &b, &inc);
 583         if (r)
 584                 return r;
 585
 586         memcpy(dm_block_data(b), &ll->mi_le, sizeof(ll->mi_le));
 587         ll->bitmap_root = dm_block_location(b);
 588
 589         dm_tm_unlock(ll->tm, b);
 590
 591         return 0;
 592 }
 593
 594 int sm_ll_new_metadata(struct ll_disk *ll, struct dm_transaction_manager *tm)
 595 {
 596         int r;
 597
 598         r = sm_ll_init(ll, tm);
 599         if (r < 0)
 600                 return r;
 601
 602         ll->load_ie = metadata_ll_load_ie;
 603         ll->save_ie = metadata_ll_save_ie;
 604         ll->init_index = metadata_ll_init_index;
 605         ll->open_index = metadata_ll_open;
 606         ll->max_entries = metadata_ll_max_entries;
 607         ll->commit = metadata_ll_commit;
 608
 609         ll->nr_blocks = 0;
 610         ll->nr_allocated = 0;
 611
 612         r = ll->init_index(ll);
 613         if (r < 0)
 614                 return r;
 615
 616         r = dm_btree_empty(&ll->ref_count_info, &ll->ref_count_root);
 617         if (r < 0)
 618                 return r;
 619
 620         return 0;
 621 }
 622
 623 int sm_ll_open_metadata(struct ll_disk *ll, struct dm_transaction_manager *tm,
 624                         void *root_le, size_t len)
 625 {
 626         int r;
 627         struct disk_sm_root smr;
 628
 629         if (len < sizeof(struct disk_sm_root)) {
 630                 DMERR("sm_metadata root too small");
 631                 return -ENOMEM;
 632         }
 633
 634         /*
 635          * We don't know the alignment of the root_le buffer, so need to
 636          * copy into a new structure.
 637          */
 638         memcpy(&smr, root_le, sizeof(smr));
 639
 640         r = sm_ll_init(ll, tm);
 641         if (r < 0)
 642                 return r;
 643
 644         ll->load_ie = metadata_ll_load_ie;
 645         ll->save_ie = metadata_ll_save_ie;
 646         ll->init_index = metadata_ll_init_index;
 647         ll->open_index = metadata_ll_open;
 648         ll->max_entries = metadata_ll_max_entries;
 649         ll->commit = metadata_ll_commit;
 650
 651         ll->nr_blocks = le64_to_cpu(smr.nr_blocks);
 652         ll->nr_allocated = le64_to_cpu(smr.nr_allocated);
 653         ll->bitmap_root = le64_to_cpu(smr.bitmap_root);
 654         ll->ref_count_root = le64_to_cpu(smr.ref_count_root);
 655
 656         return ll->open_index(ll);
 657 }
 658
 659 /*----------------------------------------------------------------*/
 660
 661 static int disk_ll_load_ie(struct ll_disk *ll, dm_block_t index,
 662                            struct disk_index_entry *ie)
 663 {
 664         return dm_btree_lookup(&ll->bitmap_info, ll->bitmap_root, &index, ie);
 665 }
 666
 667 static int disk_ll_save_ie(struct ll_disk *ll, dm_block_t index,
 668                            struct disk_index_entry *ie)
 669 {
 670         __dm_bless_for_disk(ie);
 671         return dm_btree_insert(&ll->bitmap_info, ll->bitmap_root,
 672                                &index, ie, &ll->bitmap_root);
 673 }
 674
 675 static int disk_ll_init_index(struct ll_disk *ll)
 676 {
 677         return dm_btree_empty(&ll->bitmap_info, &ll->bitmap_root);
 678 }
 679
 680 static int disk_ll_open(struct ll_disk *ll)
 681 {
 682         /* nothing to do */
 683         return 0;
 684 }
 685
 686 static dm_block_t disk_ll_max_entries(struct ll_disk *ll)
 687 {
 688         return -1ULL;
 689 }
 690
 691 static int disk_ll_commit(struct ll_disk *ll)
 692 {
 693         return 0;
 694 }
 695
 696 int sm_ll_new_disk(struct ll_disk *ll, struct dm_transaction_manager *tm)
 697 {
 698         int r;
 699
 700         r = sm_ll_init(ll, tm);
 701         if (r < 0)
 702                 return r;
 703
 704         ll->load_ie = disk_ll_load_ie;
 705         ll->save_ie = disk_ll_save_ie;
 706         ll->init_index = disk_ll_init_index;
 707         ll->open_index = disk_ll_open;
 708         ll->max_entries = disk_ll_max_entries;
 709         ll->commit = disk_ll_commit;
 710
 711         ll->nr_blocks = 0;
 712         ll->nr_allocated = 0;
 713
 714         r = ll->init_index(ll);
 715         if (r < 0)
 716                 return r;
 717
 718         r = dm_btree_empty(&ll->ref_count_info, &ll->ref_count_root);
 719         if (r < 0)
 720                 return r;
 721
 722         return 0;
 723 }
 724
 725 int sm_ll_open_disk(struct ll_disk *ll, struct dm_transaction_manager *tm,
 726                     void *root_le, size_t len)
 727 {
 728         int r;
 729         struct disk_sm_root *smr = root_le;
 730
 731         if (len < sizeof(struct disk_sm_root)) {
 732                 DMERR("sm_metadata root too small");
 733                 return -ENOMEM;
 734         }
 735
 736         r = sm_ll_init(ll, tm);
 737         if (r < 0)
 738                 return r;
 739
 740         ll->load_ie = disk_ll_load_ie;
 741         ll->save_ie = disk_ll_save_ie;
 742         ll->init_index = disk_ll_init_index;
 743         ll->open_index = disk_ll_open;
 744         ll->max_entries = disk_ll_max_entries;
 745         ll->commit = disk_ll_commit;
 746
 747         ll->nr_blocks = le64_to_cpu(smr->nr_blocks);
 748         ll->nr_allocated = le64_to_cpu(smr->nr_allocated);
 749         ll->bitmap_root = le64_to_cpu(smr->bitmap_root);
 750         ll->ref_count_root = le64_to_cpu(smr->ref_count_root);
 751
 752         return ll->open_index(ll);
 753 }
 754
 755 /*----------------------------------------------------------------*/