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("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("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 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 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("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("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 = bitmap_prepare_for_write,
 112         .check = 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 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                     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         ll->tm = tm;
 194
 195         ll->bitmap_info.tm = tm;
 196         ll->bitmap_info.levels = 1;
 197
 198         /*
 199          * Because the new bitmap blocks are created via a shadow
 200          * operation, the old entry has already had its reference count
 201          * decremented and we don't need the btree to do any bookkeeping.
 202          */
 203         ll->bitmap_info.value_type.size = sizeof(struct disk_index_entry);
 204         ll->bitmap_info.value_type.inc = NULL;
 205         ll->bitmap_info.value_type.dec = NULL;
 206         ll->bitmap_info.value_type.equal = NULL;
 207
 208         ll->ref_count_info.tm = tm;
 209         ll->ref_count_info.levels = 1;
 210         ll->ref_count_info.value_type.size = sizeof(uint32_t);
 211         ll->ref_count_info.value_type.inc = NULL;
 212         ll->ref_count_info.value_type.dec = NULL;
 213         ll->ref_count_info.value_type.equal = NULL;
 214
 215         ll->block_size = dm_bm_block_size(dm_tm_get_bm(tm));
 216
 217         if (ll->block_size > (1 << 30)) {
 218                 DMERR("block size too big to hold bitmaps");
 219                 return -EINVAL;
 220         }
 221
 222         ll->entries_per_block = (ll->block_size - sizeof(struct disk_bitmap_header)) *
 223                 ENTRIES_PER_BYTE;
 224         ll->nr_blocks = 0;
 225         ll->bitmap_root = 0;
 226         ll->ref_count_root = 0;
 227         ll->bitmap_index_changed = false;
 228
 229         return 0;
 230 }
 231
 232 int sm_ll_extend(struct ll_disk *ll, dm_block_t extra_blocks)
 233 {
 234         int r;
 235         dm_block_t i, nr_blocks, nr_indexes;
 236         unsigned old_blocks, blocks;
 237
 238         nr_blocks = ll->nr_blocks + extra_blocks;
 239         old_blocks = dm_sector_div_up(ll->nr_blocks, ll->entries_per_block);
 240         blocks = dm_sector_div_up(nr_blocks, ll->entries_per_block);
 241
 242         nr_indexes = dm_sector_div_up(nr_blocks, ll->entries_per_block);
 243         if (nr_indexes > ll->max_entries(ll)) {
 244                 DMERR("space map too large");
 245                 return -EINVAL;
 246         }
 247
 248         for (i = old_blocks; i < blocks; i++) {
 249                 struct dm_block *b;
 250                 struct disk_index_entry idx;
 251
 252                 r = dm_tm_new_block(ll->tm, &dm_sm_bitmap_validator, &b);
 253                 if (r < 0)
 254                         return r;
 255                 idx.blocknr = cpu_to_le64(dm_block_location(b));
 256
 257                 r = dm_tm_unlock(ll->tm, b);
 258                 if (r < 0)
 259                         return r;
 260
 261                 idx.nr_free = cpu_to_le32(ll->entries_per_block);
 262                 idx.none_free_before = 0;
 263
 264                 r = ll->save_ie(ll, i, &idx);
 265                 if (r < 0)
 266                         return r;
 267         }
 268
 269         ll->nr_blocks = nr_blocks;
 270         return 0;
 271 }
 272
 273 int sm_ll_lookup_bitmap(struct ll_disk *ll, dm_block_t b, uint32_t *result)
 274 {
 275         int r;
 276         dm_block_t index = b;
 277         struct disk_index_entry ie_disk;
 278         struct dm_block *blk;
 279
 280         b = do_div(index, ll->entries_per_block);
 281         r = ll->load_ie(ll, index, &ie_disk);
 282         if (r < 0)
 283                 return r;
 284
 285         r = dm_tm_read_lock(ll->tm, le64_to_cpu(ie_disk.blocknr),
 286                             &dm_sm_bitmap_validator, &blk);
 287         if (r < 0)
 288                 return r;
 289
 290         *result = sm_lookup_bitmap(dm_bitmap_data(blk), b);
 291
 292         return dm_tm_unlock(ll->tm, blk);
 293 }
 294
 295 int sm_ll_lookup(struct ll_disk *ll, dm_block_t b, uint32_t *result)
 296 {
 297         __le32 le_rc;
 298         int r = sm_ll_lookup_bitmap(ll, b, result);
 299
 300         if (r)
 301                 return r;
 302
 303         if (*result != 3)
 304                 return r;
 305
 306         r = dm_btree_lookup(&ll->ref_count_info, ll->ref_count_root, &b, &le_rc);
 307         if (r < 0)
 308                 return r;
 309
 310         *result = le32_to_cpu(le_rc);
 311
 312         return r;
 313 }
 314
 315 int sm_ll_find_free_block(struct ll_disk *ll, dm_block_t begin,
 316                           dm_block_t end, dm_block_t *result)
 317 {
 318         int r;
 319         struct disk_index_entry ie_disk;
 320         dm_block_t i, index_begin = begin;
 321         dm_block_t index_end = dm_sector_div_up(end, ll->entries_per_block);
 322
 323         /*
 324          * FIXME: Use shifts
 325          */
 326         begin = do_div(index_begin, ll->entries_per_block);
 327         end = do_div(end, ll->entries_per_block);
 328
 329         for (i = index_begin; i < index_end; i++, begin = 0) {
 330                 struct dm_block *blk;
 331                 unsigned position;
 332                 uint32_t bit_end;
 333
 334                 r = ll->load_ie(ll, i, &ie_disk);
 335                 if (r < 0)
 336                         return r;
 337
 338                 if (le32_to_cpu(ie_disk.nr_free) == 0)
 339                         continue;
 340
 341                 r = dm_tm_read_lock(ll->tm, le64_to_cpu(ie_disk.blocknr),
 342                                     &dm_sm_bitmap_validator, &blk);
 343                 if (r < 0)
 344                         return r;
 345
 346                 bit_end = (i == index_end - 1) ?  end : ll->entries_per_block;
 347
 348                 r = sm_find_free(dm_bitmap_data(blk),
 349                                  max_t(unsigned, begin, le32_to_cpu(ie_disk.none_free_before)),
 350                                  bit_end, &position);
 351                 if (r == -ENOSPC) {
 352                         /*
 353                          * This might happen because we started searching
 354                          * part way through the bitmap.
 355                          */
 356                         dm_tm_unlock(ll->tm, blk);
 357                         continue;
 358
 359                 } else if (r < 0) {
 360                         dm_tm_unlock(ll->tm, blk);
 361                         return r;
 362                 }
 363
 364                 r = dm_tm_unlock(ll->tm, blk);
 365                 if (r < 0)
 366                         return r;
 367
 368                 *result = i * ll->entries_per_block + (dm_block_t) position;
 369                 return 0;
 370         }
 371
 372         return -ENOSPC;
 373 }
 374
 375 int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
 376                  uint32_t ref_count, enum allocation_event *ev)
 377 {
 378         int r;
 379         uint32_t bit, old;
 380         struct dm_block *nb;
 381         dm_block_t index = b;
 382         struct disk_index_entry ie_disk;
 383         void *bm_le;
 384         int inc;
 385
 386         bit = do_div(index, ll->entries_per_block);
 387         r = ll->load_ie(ll, index, &ie_disk);
 388         if (r < 0)
 389                 return r;
 390
 391         r = dm_tm_shadow_block(ll->tm, le64_to_cpu(ie_disk.blocknr),
 392                                &dm_sm_bitmap_validator, &nb, &inc);
 393         if (r < 0) {
 394                 DMERR("dm_tm_shadow_block() failed");
 395                 return r;
 396         }
 397         ie_disk.blocknr = cpu_to_le64(dm_block_location(nb));
 398
 399         bm_le = dm_bitmap_data(nb);
 400         old = sm_lookup_bitmap(bm_le, bit);
 401
 402         if (ref_count <= 2) {
 403                 sm_set_bitmap(bm_le, bit, ref_count);
 404
 405                 r = dm_tm_unlock(ll->tm, nb);
 406                 if (r < 0)
 407                         return r;
 408
 409                 if (old > 2) {
 410                         r = dm_btree_remove(&ll->ref_count_info,
 411                                             ll->ref_count_root,
 412                                             &b, &ll->ref_count_root);
 413                         if (r)
 414                                 return r;
 415                 }
 416
 417         } else {
 418                 __le32 le_rc = cpu_to_le32(ref_count);
 419
 420                 sm_set_bitmap(bm_le, bit, 3);
 421                 r = dm_tm_unlock(ll->tm, nb);
 422                 if (r < 0)
 423                         return r;
 424
 425                 __dm_bless_for_disk(&le_rc);
 426                 r = dm_btree_insert(&ll->ref_count_info, ll->ref_count_root,
 427                                     &b, &le_rc, &ll->ref_count_root);
 428                 if (r < 0) {
 429                         DMERR("ref count insert failed");
 430                         return r;
 431                 }
 432         }
 433
 434         if (ref_count && !old) {
 435                 *ev = SM_ALLOC;
 436                 ll->nr_allocated++;
 437                 ie_disk.nr_free = cpu_to_le32(le32_to_cpu(ie_disk.nr_free) - 1);
 438                 if (le32_to_cpu(ie_disk.none_free_before) == bit)
 439                         ie_disk.none_free_before = cpu_to_le32(bit + 1);
 440
 441         } else if (old && !ref_count) {
 442                 *ev = SM_FREE;
 443                 ll->nr_allocated--;
 444                 ie_disk.nr_free = cpu_to_le32(le32_to_cpu(ie_disk.nr_free) + 1);
 445                 ie_disk.none_free_before = cpu_to_le32(min(le32_to_cpu(ie_disk.none_free_before), bit));
 446         }
 447
 448         return ll->save_ie(ll, index, &ie_disk);
 449 }
 450
 451 int sm_ll_inc(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
 452 {
 453         int r;
 454         uint32_t rc;
 455
 456         r = sm_ll_lookup(ll, b, &rc);
 457         if (r)
 458                 return r;
 459
 460         return sm_ll_insert(ll, b, rc + 1, ev);
 461 }
 462
 463 int sm_ll_dec(struct ll_disk *ll, dm_block_t b, enum allocation_event *ev)
 464 {
 465         int r;
 466         uint32_t rc;
 467
 468         r = sm_ll_lookup(ll, b, &rc);
 469         if (r)
 470                 return r;
 471
 472         if (!rc)
 473                 return -EINVAL;
 474
 475         return sm_ll_insert(ll, b, rc - 1, ev);
 476 }
 477
 478 int sm_ll_commit(struct ll_disk *ll)
 479 {
 480         int r = 0;
 481
 482         if (ll->bitmap_index_changed) {
 483                 r = ll->commit(ll);
 484                 if (!r)
 485                         ll->bitmap_index_changed = false;
 486         }
 487
 488         return r;
 489 }
 490
 491 /*----------------------------------------------------------------*/
 492
 493 static int metadata_ll_load_ie(struct ll_disk *ll, dm_block_t index,
 494                                struct disk_index_entry *ie)
 495 {
 496         memcpy(ie, ll->mi_le.index + index, sizeof(*ie));
 497         return 0;
 498 }
 499
 500 static int metadata_ll_save_ie(struct ll_disk *ll, dm_block_t index,
 501                                struct disk_index_entry *ie)
 502 {
 503         ll->bitmap_index_changed = true;
 504         memcpy(ll->mi_le.index + index, ie, sizeof(*ie));
 505         return 0;
 506 }
 507
 508 static int metadata_ll_init_index(struct ll_disk *ll)
 509 {
 510         int r;
 511         struct dm_block *b;
 512
 513         r = dm_tm_new_block(ll->tm, &index_validator, &b);
 514         if (r < 0)
 515                 return r;
 516
 517         memcpy(dm_block_data(b), &ll->mi_le, sizeof(ll->mi_le));
 518         ll->bitmap_root = dm_block_location(b);
 519
 520         return dm_tm_unlock(ll->tm, b);
 521 }
 522
 523 static int metadata_ll_open(struct ll_disk *ll)
 524 {
 525         int r;
 526         struct dm_block *block;
 527
 528         r = dm_tm_read_lock(ll->tm, ll->bitmap_root,
 529                             &index_validator, &block);
 530         if (r)
 531                 return r;
 532
 533         memcpy(&ll->mi_le, dm_block_data(block), sizeof(ll->mi_le));
 534         return dm_tm_unlock(ll->tm, block);
 535 }
 536
 537 static dm_block_t metadata_ll_max_entries(struct ll_disk *ll)
 538 {
 539         return MAX_METADATA_BITMAPS;
 540 }
 541
 542 static int metadata_ll_commit(struct ll_disk *ll)
 543 {
 544         int r, inc;
 545         struct dm_block *b;
 546
 547         r = dm_tm_shadow_block(ll->tm, ll->bitmap_root, &index_validator, &b, &inc);
 548         if (r)
 549                 return r;
 550
 551         memcpy(dm_block_data(b), &ll->mi_le, sizeof(ll->mi_le));
 552         ll->bitmap_root = dm_block_location(b);
 553
 554         return dm_tm_unlock(ll->tm, b);
 555 }
 556
 557 int sm_ll_new_metadata(struct ll_disk *ll, struct dm_transaction_manager *tm)
 558 {
 559         int r;
 560
 561         r = sm_ll_init(ll, tm);
 562         if (r < 0)
 563                 return r;
 564
 565         ll->load_ie = metadata_ll_load_ie;
 566         ll->save_ie = metadata_ll_save_ie;
 567         ll->init_index = metadata_ll_init_index;
 568         ll->open_index = metadata_ll_open;
 569         ll->max_entries = metadata_ll_max_entries;
 570         ll->commit = metadata_ll_commit;
 571
 572         ll->nr_blocks = 0;
 573         ll->nr_allocated = 0;
 574
 575         r = ll->init_index(ll);
 576         if (r < 0)
 577                 return r;
 578
 579         r = dm_btree_empty(&ll->ref_count_info, &ll->ref_count_root);
 580         if (r < 0)
 581                 return r;
 582
 583         return 0;
 584 }
 585
 586 int sm_ll_open_metadata(struct ll_disk *ll, struct dm_transaction_manager *tm,
 587                         void *root_le, size_t len)
 588 {
 589         int r;
 590         struct disk_sm_root *smr = root_le;
 591
 592         if (len < sizeof(struct disk_sm_root)) {
 593                 DMERR("sm_metadata root too small");
 594                 return -ENOMEM;
 595         }
 596
 597         r = sm_ll_init(ll, tm);
 598         if (r < 0)
 599                 return r;
 600
 601         ll->load_ie = metadata_ll_load_ie;
 602         ll->save_ie = metadata_ll_save_ie;
 603         ll->init_index = metadata_ll_init_index;
 604         ll->open_index = metadata_ll_open;
 605         ll->max_entries = metadata_ll_max_entries;
 606         ll->commit = metadata_ll_commit;
 607
 608         ll->nr_blocks = le64_to_cpu(smr->nr_blocks);
 609         ll->nr_allocated = le64_to_cpu(smr->nr_allocated);
 610         ll->bitmap_root = le64_to_cpu(smr->bitmap_root);
 611         ll->ref_count_root = le64_to_cpu(smr->ref_count_root);
 612
 613         return ll->open_index(ll);
 614 }
 615
 616 /*----------------------------------------------------------------*/
 617
 618 static int disk_ll_load_ie(struct ll_disk *ll, dm_block_t index,
 619                            struct disk_index_entry *ie)
 620 {
 621         return dm_btree_lookup(&ll->bitmap_info, ll->bitmap_root, &index, ie);
 622 }
 623
 624 static int disk_ll_save_ie(struct ll_disk *ll, dm_block_t index,
 625                            struct disk_index_entry *ie)
 626 {
 627         __dm_bless_for_disk(ie);
 628         return dm_btree_insert(&ll->bitmap_info, ll->bitmap_root,
 629                                &index, ie, &ll->bitmap_root);
 630 }
 631
 632 static int disk_ll_init_index(struct ll_disk *ll)
 633 {
 634         return dm_btree_empty(&ll->bitmap_info, &ll->bitmap_root);
 635 }
 636
 637 static int disk_ll_open(struct ll_disk *ll)
 638 {
 639         /* nothing to do */
 640         return 0;
 641 }
 642
 643 static dm_block_t disk_ll_max_entries(struct ll_disk *ll)
 644 {
 645         return -1ULL;
 646 }
 647
 648 static int disk_ll_commit(struct ll_disk *ll)
 649 {
 650         return 0;
 651 }
 652
 653 int sm_ll_new_disk(struct ll_disk *ll, struct dm_transaction_manager *tm)
 654 {
 655         int r;
 656
 657         r = sm_ll_init(ll, tm);
 658         if (r < 0)
 659                 return r;
 660
 661         ll->load_ie = disk_ll_load_ie;
 662         ll->save_ie = disk_ll_save_ie;
 663         ll->init_index = disk_ll_init_index;
 664         ll->open_index = disk_ll_open;
 665         ll->max_entries = disk_ll_max_entries;
 666         ll->commit = disk_ll_commit;
 667
 668         ll->nr_blocks = 0;
 669         ll->nr_allocated = 0;
 670
 671         r = ll->init_index(ll);
 672         if (r < 0)
 673                 return r;
 674
 675         r = dm_btree_empty(&ll->ref_count_info, &ll->ref_count_root);
 676         if (r < 0)
 677                 return r;
 678
 679         return 0;
 680 }
 681
 682 int sm_ll_open_disk(struct ll_disk *ll, struct dm_transaction_manager *tm,
 683                     void *root_le, size_t len)
 684 {
 685         int r;
 686         struct disk_sm_root *smr = root_le;
 687
 688         if (len < sizeof(struct disk_sm_root)) {
 689                 DMERR("sm_metadata root too small");
 690                 return -ENOMEM;
 691         }
 692
 693         r = sm_ll_init(ll, tm);
 694         if (r < 0)
 695                 return r;
 696
 697         ll->load_ie = disk_ll_load_ie;
 698         ll->save_ie = disk_ll_save_ie;
 699         ll->init_index = disk_ll_init_index;
 700         ll->open_index = disk_ll_open;
 701         ll->max_entries = disk_ll_max_entries;
 702         ll->commit = disk_ll_commit;
 703
 704         ll->nr_blocks = le64_to_cpu(smr->nr_blocks);
 705         ll->nr_allocated = le64_to_cpu(smr->nr_allocated);
 706         ll->bitmap_root = le64_to_cpu(smr->bitmap_root);
 707         ll->ref_count_root = le64_to_cpu(smr->ref_count_root);
 708
 709         return ll->open_index(ll);
 710 }
 711
 712 /*----------------------------------------------------------------*/