lwext4/ext4_balloc.c

   1 /*
   2  * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
   3  *
   4  *
   5  * HelenOS:
   6  * Copyright (c) 2012 Martin Sucha
   7  * Copyright (c) 2012 Frantisek Princ
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  *
  14  * - Redistributions of source code must retain the above copyright
  15  *   notice, this list of conditions and the following disclaimer.
  16  * - Redistributions in binary form must reproduce the above copyright
  17  *   notice, this list of conditions and the following disclaimer in the
  18  *   documentation and/or other materials provided with the distribution.
  19  * - The name of the author may not be used to endorse or promote products
  20  *   derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /** @addtogroup lwext4
  35  * @{
  36  */
  37 /**
  38  * @file  ext4_balloc.c
  39  * @brief Physical block allocator.
  40  */
  41
  42 #include "ext4_config.h"
  43 #include "ext4_balloc.h"
  44 #include "ext4_super.h"
  45 #include "ext4_crc32c.h"
  46 #include "ext4_block_group.h"
  47 #include "ext4_fs.h"
  48 #include "ext4_bitmap.h"
  49 #include "ext4_inode.h"
  50
  51 /**@brief Compute number of block group from block address.
  52  * @param sb superblock pointer.
  53  * @param baddr Absolute address of block.
  54  * @return Block group index
  55  */
  56 uint32_t ext4_balloc_get_bgid_of_block(struct ext4_sblock *s,
  57                                        uint64_t baddr)
  58 {
  59         if (ext4_get32(s, first_data_block) && baddr)
  60                 baddr--;
  61
  62         return baddr / ext4_get32(s, blocks_per_group);
  63 }
  64
  65 /**@brief Compute the starting block address of a block group
  66  * @param sb   superblock pointer.
  67  * @param bgid block group index
  68  * @return Block address
  69  */
  70 uint64_t ext4_balloc_get_block_of_bgid(struct ext4_sblock *s,
  71                                        uint32_t bgid)
  72 {
  73         uint64_t baddr = 0;
  74         if (ext4_get32(s, first_data_block))
  75                 baddr++;
  76
  77         baddr += bgid * ext4_get32(s, blocks_per_group);
  78         return baddr;
  79 }
  80
  81 static uint32_t ext4_balloc_bitmap_csum(struct ext4_sblock *sb,
  82                                         void *bitmap)
  83 {
  84         uint32_t checksum = 0;
  85         if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
  86                 uint32_t blocks_per_group =
  87                         ext4_get32(sb, blocks_per_group);
  88
  89                 /* First calculate crc32 checksum against fs uuid */
  90                 checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid,
  91                                 sizeof(sb->uuid));
  92                 /* Then calculate crc32 checksum against block_group_desc */
  93                 checksum = ext4_crc32c(checksum, bitmap,
  94                                      blocks_per_group / 8);
  95         }
  96         return checksum;
  97 }
  98
  99 /*
 100  * BIG FAT NOTES:
 101  *       Currently we do not verify the checksum of bitmaps.
 102  */
 103
 104 void ext4_balloc_set_bitmap_csum(struct ext4_sblock *sb,
 105                                  struct ext4_bgroup *bg,
 106                                  void *bitmap)
 107 {
 108         int desc_size = ext4_sb_get_desc_size(sb);
 109         uint32_t checksum = ext4_balloc_bitmap_csum(sb, bitmap);
 110         uint16_t lo_checksum = to_le16(checksum & 0xFFFF),
 111                  hi_checksum = to_le16(checksum >> 16);
 112
 113         /* See if we need to assign a 32bit checksum */
 114         bg->block_bitmap_csum_lo = lo_checksum;
 115         if (desc_size == EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE)
 116                 bg->block_bitmap_csum_hi = hi_checksum;
 117
 118 }
 119
 120 int ext4_balloc_free_block(struct ext4_inode_ref *inode_ref, ext4_fsblk_t baddr)
 121 {
 122         struct ext4_fs *fs = inode_ref->fs;
 123         struct ext4_sblock *sb = &fs->sb;
 124
 125         uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, baddr);
 126         uint32_t index_in_group = ext4_fs_baddr2_index_in_group(sb, baddr);
 127
 128         /* Load block group reference */
 129         struct ext4_block_group_ref bg_ref;
 130         int rc = ext4_fs_get_block_group_ref(fs, block_group, &bg_ref);
 131         if (rc != EOK)
 132                 return rc;
 133
 134         /* Load block with bitmap */
 135         ext4_fsblk_t bitmap_block_addr =
 136             ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 137
 138         struct ext4_block bitmap_block;
 139
 140         rc = ext4_block_get(fs->bdev, &bitmap_block, bitmap_block_addr);
 141         if (rc != EOK) {
 142                 ext4_fs_put_block_group_ref(&bg_ref);
 143                 return rc;
 144         }
 145
 146         /* Modify bitmap */
 147         ext4_bmap_bit_clr(bitmap_block.data, index_in_group);
 148         ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 149                                     bitmap_block.data);
 150         bitmap_block.dirty = true;
 151
 152         /* Release block with bitmap */
 153         rc = ext4_block_set(fs->bdev, &bitmap_block);
 154         if (rc != EOK) {
 155                 /* Error in saving bitmap */
 156                 ext4_fs_put_block_group_ref(&bg_ref);
 157                 return rc;
 158         }
 159
 160         uint32_t block_size = ext4_sb_get_block_size(sb);
 161
 162         /* Update superblock free blocks count */
 163         uint64_t sb_free_blocks = ext4_sb_get_free_blocks_cnt(sb);
 164         sb_free_blocks++;
 165         ext4_sb_set_free_blocks_cnt(sb, sb_free_blocks);
 166
 167         /* Update inode blocks count */
 168         uint64_t ino_blocks = ext4_inode_get_blocks_count(sb, inode_ref->inode);
 169         ino_blocks -= block_size / EXT4_INODE_BLOCK_SIZE;
 170         ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
 171         inode_ref->dirty = true;
 172
 173         /* Update block group free blocks count */
 174         uint32_t free_blocks =
 175             ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 176         free_blocks++;
 177         ext4_bg_set_free_blocks_count(bg_ref.block_group, sb, free_blocks);
 178
 179         bg_ref.dirty = true;
 180
 181         /* Release block group reference */
 182         return ext4_fs_put_block_group_ref(&bg_ref);
 183 }
 184
 185 int ext4_balloc_free_blocks(struct ext4_inode_ref *inode_ref, ext4_fsblk_t first,
 186                             uint32_t count)
 187 {
 188         int rc = EOK;
 189         struct ext4_fs *fs = inode_ref->fs;
 190         struct ext4_sblock *sb = &fs->sb;
 191
 192         /* Compute indexes */
 193         uint32_t block_group_first = ext4_balloc_get_bgid_of_block(sb, first);
 194
 195         /* Compute indexes */
 196         uint32_t block_group_last =
 197             ext4_balloc_get_bgid_of_block(sb, first + count - 1);
 198
 199         if (!ext4_sb_feature_incom(sb, EXT4_FINCOM_FLEX_BG)) {
 200                 /*It is not possible without flex_bg that blocks are continuous
 201                  * and and last block belongs to other bg.*/
 202                 ext4_assert(block_group_first == ext4_balloc_get_bgid_of_block(
 203                                                      sb, first + count - 1));
 204         }
 205
 206         /* Load block group reference */
 207         struct ext4_block_group_ref bg_ref;
 208         while (block_group_first <= block_group_last) {
 209
 210                 rc =
 211                     ext4_fs_get_block_group_ref(fs, block_group_first, &bg_ref);
 212                 if (rc != EOK)
 213                         return rc;
 214
 215                 uint32_t index_in_group_first =
 216                     ext4_fs_baddr2_index_in_group(sb, first);
 217
 218                 /* Load block with bitmap */
 219                 ext4_fsblk_t bitmap_block_addr =
 220                     ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 221
 222                 struct ext4_block bitmap_block;
 223
 224                 rc = ext4_block_get(fs->bdev, &bitmap_block, bitmap_block_addr);
 225                 if (rc != EOK) {
 226                         ext4_fs_put_block_group_ref(&bg_ref);
 227                         return rc;
 228                 }
 229
 230                 uint32_t free_cnt =
 231                     ext4_sb_get_block_size(sb) * 8 - index_in_group_first;
 232
 233                 /*If last block, free only count blocks*/
 234                 free_cnt = count > free_cnt ? free_cnt : count;
 235
 236                 /* Modify bitmap */
 237                 ext4_bmap_bits_free(bitmap_block.data, index_in_group_first,
 238                                     free_cnt);
 239                 ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 240                                             bitmap_block.data);
 241                 bitmap_block.dirty = true;
 242
 243                 count -= free_cnt;
 244                 first += free_cnt;
 245
 246                 /* Release block with bitmap */
 247                 rc = ext4_block_set(fs->bdev, &bitmap_block);
 248                 if (rc != EOK) {
 249                         ext4_fs_put_block_group_ref(&bg_ref);
 250                         return rc;
 251                 }
 252
 253                 uint32_t block_size = ext4_sb_get_block_size(sb);
 254
 255                 /* Update superblock free blocks count */
 256                 uint64_t sb_free_blocks = ext4_sb_get_free_blocks_cnt(sb);
 257                 sb_free_blocks += free_cnt;
 258                 ext4_sb_set_free_blocks_cnt(sb, sb_free_blocks);
 259
 260                 /* Update inode blocks count */
 261                 uint64_t ino_blocks =
 262                     ext4_inode_get_blocks_count(sb, inode_ref->inode);
 263                 ino_blocks -= free_cnt * (block_size / EXT4_INODE_BLOCK_SIZE);
 264                 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
 265                 inode_ref->dirty = true;
 266
 267                 /* Update block group free blocks count */
 268                 uint32_t free_blocks =
 269                     ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 270                 free_blocks += free_cnt;
 271                 ext4_bg_set_free_blocks_count(bg_ref.block_group, sb,
 272                                               free_blocks);
 273                 bg_ref.dirty = true;
 274
 275                 /* Release block group reference */
 276                 rc = ext4_fs_put_block_group_ref(&bg_ref);
 277                 if (rc != EOK)
 278                         break;
 279
 280                 block_group_first++;
 281         }
 282
 283         /*All blocks should be released*/
 284         ext4_assert(count == 0);
 285         return rc;
 286 }
 287
 288 int ext4_balloc_alloc_block(struct ext4_inode_ref *inode_ref,
 289                             ext4_fsblk_t goal,
 290                             ext4_fsblk_t *fblock)
 291 {
 292         ext4_fsblk_t allocated_block = 0;
 293         ext4_fsblk_t bitmap_block_addr;
 294         uint32_t rel_block_idx = 0;
 295         uint64_t free_blocks;
 296         struct ext4_block bitmap_block;
 297         int rc;
 298
 299         struct ext4_sblock *sb = &inode_ref->fs->sb;
 300
 301         /* Load block group number for goal and relative index */
 302         uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, goal);
 303         uint32_t index_in_group = ext4_fs_baddr2_index_in_group(sb, goal);
 304
 305         /* Load block group reference */
 306         struct ext4_block_group_ref bg_ref;
 307         rc = ext4_fs_get_block_group_ref(inode_ref->fs, block_group, &bg_ref);
 308         if (rc != EOK)
 309                 return rc;
 310
 311         free_blocks = ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 312         if (free_blocks == 0) {
 313                 /* This group has no free blocks */
 314                 goto goal_failed;
 315         }
 316
 317         /* Compute indexes */
 318         ext4_fsblk_t first_in_group = ext4_balloc_get_block_of_bgid(sb, bg_ref.index);
 319
 320         uint32_t first_in_group_index =
 321             ext4_fs_baddr2_index_in_group(sb, first_in_group);
 322
 323         if (index_in_group < first_in_group_index)
 324                 index_in_group = first_in_group_index;
 325
 326         /* Load block with bitmap */
 327         bitmap_block_addr = ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 328
 329         rc = ext4_block_get(inode_ref->fs->bdev, &bitmap_block,
 330                             bitmap_block_addr);
 331         if (rc != EOK) {
 332                 ext4_fs_put_block_group_ref(&bg_ref);
 333                 return rc;
 334         }
 335
 336         /* Check if goal is free */
 337         if (ext4_bmap_is_bit_clr(bitmap_block.data, index_in_group)) {
 338                 ext4_bmap_bit_set(bitmap_block.data, index_in_group);
 339                 ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 340                                             bitmap_block.data);
 341                 bitmap_block.dirty = true;
 342                 rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 343                 if (rc != EOK) {
 344                         ext4_fs_put_block_group_ref(&bg_ref);
 345                         return rc;
 346                 }
 347
 348                 allocated_block = ext4_fs_index_in_group2_baddr(
 349                     sb, index_in_group, block_group);
 350
 351                 goto success;
 352         }
 353
 354         uint32_t blocks_in_group = ext4_blocks_in_group_cnt(sb, block_group);
 355
 356         uint32_t end_idx = (index_in_group + 63) & ~63;
 357         if (end_idx > blocks_in_group)
 358                 end_idx = blocks_in_group;
 359
 360         /* Try to find free block near to goal */
 361         uint32_t tmp_idx;
 362         for (tmp_idx = index_in_group + 1; tmp_idx < end_idx; ++tmp_idx) {
 363                 if (ext4_bmap_is_bit_clr(bitmap_block.data, tmp_idx)) {
 364                         ext4_bmap_bit_set(bitmap_block.data, tmp_idx);
 365
 366                         ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 367                                                     bitmap_block.data);
 368                         bitmap_block.dirty = true;
 369                         rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 370                         if (rc != EOK)
 371                                 return rc;
 372
 373                         allocated_block = ext4_fs_index_in_group2_baddr(
 374                             sb, tmp_idx, block_group);
 375
 376                         goto success;
 377                 }
 378         }
 379
 380         /* Find free bit in bitmap */
 381         rc = ext4_bmap_bit_find_clr(bitmap_block.data, index_in_group,
 382                                     blocks_in_group, &rel_block_idx);
 383         if (rc == EOK) {
 384                 ext4_bmap_bit_set(bitmap_block.data, rel_block_idx);
 385                 ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 386                                             bitmap_block.data);
 387                 bitmap_block.dirty = true;
 388                 rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 389                 if (rc != EOK)
 390                         return rc;
 391
 392                 allocated_block = ext4_fs_index_in_group2_baddr(
 393                     sb, rel_block_idx, block_group);
 394
 395                 goto success;
 396         }
 397
 398         /* No free block found yet */
 399         rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 400         if (rc != EOK) {
 401                 ext4_fs_put_block_group_ref(&bg_ref);
 402                 return rc;
 403         }
 404
 405 goal_failed:
 406
 407         rc = ext4_fs_put_block_group_ref(&bg_ref);
 408         if (rc != EOK)
 409                 return rc;
 410
 411         /* Try other block groups */
 412         uint32_t block_group_count = ext4_block_group_cnt(sb);
 413
 414         uint32_t bgid = (block_group + 1) % block_group_count;
 415         uint32_t count = block_group_count;
 416
 417         while (count > 0) {
 418                 rc = ext4_fs_get_block_group_ref(inode_ref->fs, bgid, &bg_ref);
 419                 if (rc != EOK)
 420                         return rc;
 421
 422                 free_blocks =
 423                     ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 424                 if (free_blocks == 0) {
 425                         /* This group has no free blocks */
 426                         goto next_group;
 427                 }
 428
 429                 /* Load block with bitmap */
 430                 bitmap_block_addr =
 431                     ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 432
 433                 rc = ext4_block_get(inode_ref->fs->bdev, &bitmap_block,
 434                                     bitmap_block_addr);
 435
 436                 if (rc != EOK) {
 437                         ext4_fs_put_block_group_ref(&bg_ref);
 438                         return rc;
 439                 }
 440
 441                 /* Compute indexes */
 442                 first_in_group = ext4_balloc_get_block_of_bgid(sb, bgid);
 443                 index_in_group =
 444                     ext4_fs_baddr2_index_in_group(sb, first_in_group);
 445                 blocks_in_group = ext4_blocks_in_group_cnt(sb, bgid);
 446
 447                 first_in_group_index =
 448                     ext4_fs_baddr2_index_in_group(sb, first_in_group);
 449
 450                 if (index_in_group < first_in_group_index)
 451                         index_in_group = first_in_group_index;
 452
 453                 rc = ext4_bmap_bit_find_clr(bitmap_block.data, index_in_group,
 454                                             blocks_in_group, &rel_block_idx);
 455
 456                 if (rc == EOK) {
 457
 458                         ext4_bmap_bit_set(bitmap_block.data, rel_block_idx);
 459
 460                         ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 461                                                     bitmap_block.data);
 462                         bitmap_block.dirty = true;
 463                         rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 464                         if (rc != EOK) {
 465                                 ext4_fs_put_block_group_ref(&bg_ref);
 466                                 return rc;
 467                         }
 468
 469                         allocated_block = ext4_fs_index_in_group2_baddr(
 470                             sb, rel_block_idx, bgid);
 471
 472                         goto success;
 473                 }
 474
 475                 rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 476                 if (rc != EOK) {
 477                         ext4_fs_put_block_group_ref(&bg_ref);
 478                         return rc;
 479                 }
 480
 481         next_group:
 482                 rc = ext4_fs_put_block_group_ref(&bg_ref);
 483                 if (rc != EOK) {
 484                         return rc;
 485                 }
 486
 487                 /* Goto next group */
 488                 bgid = (bgid + 1) % block_group_count;
 489                 count--;
 490         }
 491
 492         return ENOSPC;
 493
 494 success:
 495     /* Empty command - because of syntax */
 496     ;
 497
 498         uint32_t block_size = ext4_sb_get_block_size(sb);
 499
 500         /* Update superblock free blocks count */
 501         uint64_t sb_free_blocks = ext4_sb_get_free_blocks_cnt(sb);
 502         sb_free_blocks--;
 503         ext4_sb_set_free_blocks_cnt(sb, sb_free_blocks);
 504
 505         /* Update inode blocks (different block size!) count */
 506         uint64_t ino_blocks = ext4_inode_get_blocks_count(sb, inode_ref->inode);
 507         ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
 508         ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
 509         inode_ref->dirty = true;
 510
 511         /* Update block group free blocks count */
 512         uint64_t bg_free_blocks =
 513             ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 514         bg_free_blocks--;
 515         ext4_bg_set_free_blocks_count(bg_ref.block_group, sb, bg_free_blocks);
 516
 517         bg_ref.dirty = true;
 518
 519         rc = ext4_fs_put_block_group_ref(&bg_ref);
 520
 521         *fblock = allocated_block;
 522         return rc;
 523 }
 524
 525 int ext4_balloc_try_alloc_block(struct ext4_inode_ref *inode_ref,
 526                                 ext4_fsblk_t baddr, bool *free)
 527 {
 528         int rc;
 529
 530         struct ext4_fs *fs = inode_ref->fs;
 531         struct ext4_sblock *sb = &fs->sb;
 532
 533         /* Compute indexes */
 534         uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, baddr);
 535         uint32_t index_in_group = ext4_fs_baddr2_index_in_group(sb, baddr);
 536
 537         /* Load block group reference */
 538         struct ext4_block_group_ref bg_ref;
 539         rc = ext4_fs_get_block_group_ref(fs, block_group, &bg_ref);
 540         if (rc != EOK)
 541                 return rc;
 542
 543         /* Load block with bitmap */
 544         ext4_fsblk_t bitmap_block_addr =
 545             ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 546
 547         struct ext4_block bitmap_block;
 548
 549         rc = ext4_block_get(fs->bdev, &bitmap_block, bitmap_block_addr);
 550         if (rc != EOK) {
 551                 ext4_fs_put_block_group_ref(&bg_ref);
 552                 return rc;
 553         }
 554
 555         /* Check if block is free */
 556         *free = ext4_bmap_is_bit_clr(bitmap_block.data, index_in_group);
 557
 558         /* Allocate block if possible */
 559         if (*free) {
 560                 ext4_bmap_bit_set(bitmap_block.data, index_in_group);
 561                 ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 562                                             bitmap_block.data);
 563                 bitmap_block.dirty = true;
 564         }
 565
 566         /* Release block with bitmap */
 567         rc = ext4_block_set(fs->bdev, &bitmap_block);
 568         if (rc != EOK) {
 569                 /* Error in saving bitmap */
 570                 ext4_fs_put_block_group_ref(&bg_ref);
 571                 return rc;
 572         }
 573
 574         /* If block is not free, return */
 575         if (!(*free))
 576                 goto terminate;
 577
 578         uint32_t block_size = ext4_sb_get_block_size(sb);
 579
 580         /* Update superblock free blocks count */
 581         uint64_t sb_free_blocks = ext4_sb_get_free_blocks_cnt(sb);
 582         sb_free_blocks--;
 583         ext4_sb_set_free_blocks_cnt(sb, sb_free_blocks);
 584
 585         /* Update inode blocks count */
 586         uint64_t ino_blocks = ext4_inode_get_blocks_count(sb, inode_ref->inode);
 587         ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
 588         ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
 589         inode_ref->dirty = true;
 590
 591         /* Update block group free blocks count */
 592         uint32_t free_blocks =
 593             ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 594         free_blocks--;
 595         ext4_bg_set_free_blocks_count(bg_ref.block_group, sb, free_blocks);
 596
 597         bg_ref.dirty = true;
 598
 599 terminate:
 600         return ext4_fs_put_block_group_ref(&bg_ref);
 601 }
 602
 603 /**
 604  * @}
 605  */