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_has_feature_read_only(sb,
  86                                 EXT4_FRO_COM_METADATA_CSUM)) {
  87                 uint32_t blocks_per_group =
  88                         ext4_get32(sb, blocks_per_group);
  89
  90                 /* First calculate crc32 checksum against fs uuid */
  91                 checksum = ext4_crc32c(~0, sb->uuid, 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_has_feature_incompatible(sb,
 200                                               EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
 201                 /*It is not possible without flex_bg that blocks are continuous
 202                  * and and last block belongs to other bg.*/
 203                 ext4_assert(block_group_first == ext4_balloc_get_bgid_of_block(
 204                                                      sb, first + count - 1));
 205         }
 206
 207         /* Load block group reference */
 208         struct ext4_block_group_ref bg_ref;
 209         while (block_group_first <= block_group_last) {
 210
 211                 rc =
 212                     ext4_fs_get_block_group_ref(fs, block_group_first, &bg_ref);
 213                 if (rc != EOK)
 214                         return rc;
 215
 216                 uint32_t index_in_group_first =
 217                     ext4_fs_baddr2_index_in_group(sb, first);
 218
 219                 /* Load block with bitmap */
 220                 ext4_fsblk_t bitmap_block_addr =
 221                     ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 222
 223                 struct ext4_block bitmap_block;
 224
 225                 rc = ext4_block_get(fs->bdev, &bitmap_block, bitmap_block_addr);
 226                 if (rc != EOK) {
 227                         ext4_fs_put_block_group_ref(&bg_ref);
 228                         return rc;
 229                 }
 230
 231                 uint32_t free_cnt =
 232                     ext4_sb_get_block_size(sb) * 8 - index_in_group_first;
 233
 234                 /*If last block, free only count blocks*/
 235                 free_cnt = count > free_cnt ? free_cnt : count;
 236
 237                 /* Modify bitmap */
 238                 ext4_bmap_bits_free(bitmap_block.data, index_in_group_first,
 239                                     free_cnt);
 240                 ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 241                                             bitmap_block.data);
 242                 bitmap_block.dirty = true;
 243
 244                 count -= free_cnt;
 245                 first += free_cnt;
 246
 247                 /* Release block with bitmap */
 248                 rc = ext4_block_set(fs->bdev, &bitmap_block);
 249                 if (rc != EOK) {
 250                         ext4_fs_put_block_group_ref(&bg_ref);
 251                         return rc;
 252                 }
 253
 254                 uint32_t block_size = ext4_sb_get_block_size(sb);
 255
 256                 /* Update superblock free blocks count */
 257                 uint64_t sb_free_blocks = ext4_sb_get_free_blocks_cnt(sb);
 258                 sb_free_blocks += free_cnt;
 259                 ext4_sb_set_free_blocks_cnt(sb, sb_free_blocks);
 260
 261                 /* Update inode blocks count */
 262                 uint64_t ino_blocks =
 263                     ext4_inode_get_blocks_count(sb, inode_ref->inode);
 264                 ino_blocks -= free_cnt * (block_size / EXT4_INODE_BLOCK_SIZE);
 265                 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
 266                 inode_ref->dirty = true;
 267
 268                 /* Update block group free blocks count */
 269                 uint32_t free_blocks =
 270                     ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 271                 free_blocks += free_cnt;
 272                 ext4_bg_set_free_blocks_count(bg_ref.block_group, sb,
 273                                               free_blocks);
 274                 bg_ref.dirty = true;
 275
 276                 /* Release block group reference */
 277                 rc = ext4_fs_put_block_group_ref(&bg_ref);
 278                 if (rc != EOK)
 279                         break;
 280
 281                 block_group_first++;
 282         }
 283
 284         /*All blocks should be released*/
 285         ext4_assert(count == 0);
 286         return rc;
 287 }
 288
 289 int ext4_balloc_alloc_block(struct ext4_inode_ref *inode_ref,
 290                             ext4_fsblk_t goal,
 291                             ext4_fsblk_t *fblock)
 292 {
 293         ext4_fsblk_t allocated_block = 0;
 294         ext4_fsblk_t bitmap_block_addr;
 295         uint32_t rel_block_idx = 0;
 296         uint64_t free_blocks;
 297         struct ext4_block bitmap_block;
 298         int rc;
 299
 300         struct ext4_sblock *sb = &inode_ref->fs->sb;
 301
 302         /* Load block group number for goal and relative index */
 303         uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, goal);
 304         uint32_t index_in_group = ext4_fs_baddr2_index_in_group(sb, goal);
 305
 306         /* Load block group reference */
 307         struct ext4_block_group_ref bg_ref;
 308         rc = ext4_fs_get_block_group_ref(inode_ref->fs, block_group, &bg_ref);
 309         if (rc != EOK)
 310                 return rc;
 311
 312         free_blocks = ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 313         if (free_blocks == 0) {
 314                 /* This group has no free blocks */
 315                 goto goal_failed;
 316         }
 317
 318         /* Compute indexes */
 319         ext4_fsblk_t first_in_group = ext4_balloc_get_block_of_bgid(sb, bg_ref.index);
 320
 321         uint32_t first_in_group_index =
 322             ext4_fs_baddr2_index_in_group(sb, first_in_group);
 323
 324         if (index_in_group < first_in_group_index)
 325                 index_in_group = first_in_group_index;
 326
 327         /* Load block with bitmap */
 328         bitmap_block_addr = ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 329
 330         rc = ext4_block_get(inode_ref->fs->bdev, &bitmap_block,
 331                             bitmap_block_addr);
 332         if (rc != EOK) {
 333                 ext4_fs_put_block_group_ref(&bg_ref);
 334                 return rc;
 335         }
 336
 337         /* Check if goal is free */
 338         if (ext4_bmap_is_bit_clr(bitmap_block.data, index_in_group)) {
 339                 ext4_bmap_bit_set(bitmap_block.data, index_in_group);
 340                 ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 341                                             bitmap_block.data);
 342                 bitmap_block.dirty = true;
 343                 rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 344                 if (rc != EOK) {
 345                         ext4_fs_put_block_group_ref(&bg_ref);
 346                         return rc;
 347                 }
 348
 349                 allocated_block = ext4_fs_index_in_group2_baddr(
 350                     sb, index_in_group, block_group);
 351
 352                 goto success;
 353         }
 354
 355         uint32_t blocks_in_group = ext4_blocks_in_group_cnt(sb, block_group);
 356
 357         uint32_t end_idx = (index_in_group + 63) & ~63;
 358         if (end_idx > blocks_in_group)
 359                 end_idx = blocks_in_group;
 360
 361         /* Try to find free block near to goal */
 362         uint32_t tmp_idx;
 363         for (tmp_idx = index_in_group + 1; tmp_idx < end_idx; ++tmp_idx) {
 364                 if (ext4_bmap_is_bit_clr(bitmap_block.data, tmp_idx)) {
 365                         ext4_bmap_bit_set(bitmap_block.data, tmp_idx);
 366
 367                         ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 368                                                     bitmap_block.data);
 369                         bitmap_block.dirty = true;
 370                         rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 371                         if (rc != EOK)
 372                                 return rc;
 373
 374                         allocated_block = ext4_fs_index_in_group2_baddr(
 375                             sb, tmp_idx, block_group);
 376
 377                         goto success;
 378                 }
 379         }
 380
 381         /* Find free bit in bitmap */
 382         rc = ext4_bmap_bit_find_clr(bitmap_block.data, index_in_group,
 383                                     blocks_in_group, &rel_block_idx);
 384         if (rc == EOK) {
 385                 ext4_bmap_bit_set(bitmap_block.data, rel_block_idx);
 386                 ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 387                                             bitmap_block.data);
 388                 bitmap_block.dirty = true;
 389                 rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 390                 if (rc != EOK)
 391                         return rc;
 392
 393                 allocated_block = ext4_fs_index_in_group2_baddr(
 394                     sb, rel_block_idx, block_group);
 395
 396                 goto success;
 397         }
 398
 399         /* No free block found yet */
 400         rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 401         if (rc != EOK) {
 402                 ext4_fs_put_block_group_ref(&bg_ref);
 403                 return rc;
 404         }
 405
 406 goal_failed:
 407
 408         rc = ext4_fs_put_block_group_ref(&bg_ref);
 409         if (rc != EOK)
 410                 return rc;
 411
 412         /* Try other block groups */
 413         uint32_t block_group_count = ext4_block_group_cnt(sb);
 414
 415         uint32_t bgid = (block_group + 1) % block_group_count;
 416         uint32_t count = block_group_count;
 417
 418         while (count > 0) {
 419                 rc = ext4_fs_get_block_group_ref(inode_ref->fs, bgid, &bg_ref);
 420                 if (rc != EOK)
 421                         return rc;
 422
 423                 free_blocks =
 424                     ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 425                 if (free_blocks == 0) {
 426                         /* This group has no free blocks */
 427                         goto next_group;
 428                 }
 429
 430                 /* Load block with bitmap */
 431                 bitmap_block_addr =
 432                     ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 433
 434                 rc = ext4_block_get(inode_ref->fs->bdev, &bitmap_block,
 435                                     bitmap_block_addr);
 436
 437                 if (rc != EOK) {
 438                         ext4_fs_put_block_group_ref(&bg_ref);
 439                         return rc;
 440                 }
 441
 442                 /* Compute indexes */
 443                 first_in_group = ext4_balloc_get_block_of_bgid(sb, bgid);
 444                 index_in_group =
 445                     ext4_fs_baddr2_index_in_group(sb, first_in_group);
 446                 blocks_in_group = ext4_blocks_in_group_cnt(sb, bgid);
 447
 448                 first_in_group_index =
 449                     ext4_fs_baddr2_index_in_group(sb, first_in_group);
 450
 451                 if (index_in_group < first_in_group_index)
 452                         index_in_group = first_in_group_index;
 453
 454                 rc = ext4_bmap_bit_find_clr(bitmap_block.data, index_in_group,
 455                                             blocks_in_group, &rel_block_idx);
 456
 457                 if (rc == EOK) {
 458
 459                         ext4_bmap_bit_set(bitmap_block.data, rel_block_idx);
 460
 461                         ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 462                                                     bitmap_block.data);
 463                         bitmap_block.dirty = true;
 464                         rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 465                         if (rc != EOK) {
 466                                 ext4_fs_put_block_group_ref(&bg_ref);
 467                                 return rc;
 468                         }
 469
 470                         allocated_block = ext4_fs_index_in_group2_baddr(
 471                             sb, rel_block_idx, bgid);
 472
 473                         goto success;
 474                 }
 475
 476                 rc = ext4_block_set(inode_ref->fs->bdev, &bitmap_block);
 477                 if (rc != EOK) {
 478                         ext4_fs_put_block_group_ref(&bg_ref);
 479                         return rc;
 480                 }
 481
 482         next_group:
 483                 rc = ext4_fs_put_block_group_ref(&bg_ref);
 484                 if (rc != EOK) {
 485                         return rc;
 486                 }
 487
 488                 /* Goto next group */
 489                 bgid = (bgid + 1) % block_group_count;
 490                 count--;
 491         }
 492
 493         return ENOSPC;
 494
 495 success:
 496     /* Empty command - because of syntax */
 497     ;
 498
 499         uint32_t block_size = ext4_sb_get_block_size(sb);
 500
 501         /* Update superblock free blocks count */
 502         uint64_t sb_free_blocks = ext4_sb_get_free_blocks_cnt(sb);
 503         sb_free_blocks--;
 504         ext4_sb_set_free_blocks_cnt(sb, sb_free_blocks);
 505
 506         /* Update inode blocks (different block size!) count */
 507         uint64_t ino_blocks = ext4_inode_get_blocks_count(sb, inode_ref->inode);
 508         ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
 509         ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
 510         inode_ref->dirty = true;
 511
 512         /* Update block group free blocks count */
 513         uint64_t bg_free_blocks =
 514             ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 515         bg_free_blocks--;
 516         ext4_bg_set_free_blocks_count(bg_ref.block_group, sb, bg_free_blocks);
 517
 518         bg_ref.dirty = true;
 519
 520         rc = ext4_fs_put_block_group_ref(&bg_ref);
 521
 522         *fblock = allocated_block;
 523         return rc;
 524 }
 525
 526 int ext4_balloc_try_alloc_block(struct ext4_inode_ref *inode_ref,
 527                                 ext4_fsblk_t baddr, bool *free)
 528 {
 529         int rc;
 530
 531         struct ext4_fs *fs = inode_ref->fs;
 532         struct ext4_sblock *sb = &fs->sb;
 533
 534         /* Compute indexes */
 535         uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, baddr);
 536         uint32_t index_in_group = ext4_fs_baddr2_index_in_group(sb, baddr);
 537
 538         /* Load block group reference */
 539         struct ext4_block_group_ref bg_ref;
 540         rc = ext4_fs_get_block_group_ref(fs, block_group, &bg_ref);
 541         if (rc != EOK)
 542                 return rc;
 543
 544         /* Load block with bitmap */
 545         ext4_fsblk_t bitmap_block_addr =
 546             ext4_bg_get_block_bitmap(bg_ref.block_group, sb);
 547
 548         struct ext4_block bitmap_block;
 549
 550         rc = ext4_block_get(fs->bdev, &bitmap_block, bitmap_block_addr);
 551         if (rc != EOK) {
 552                 ext4_fs_put_block_group_ref(&bg_ref);
 553                 return rc;
 554         }
 555
 556         /* Check if block is free */
 557         *free = ext4_bmap_is_bit_clr(bitmap_block.data, index_in_group);
 558
 559         /* Allocate block if possible */
 560         if (*free) {
 561                 ext4_bmap_bit_set(bitmap_block.data, index_in_group);
 562                 ext4_balloc_set_bitmap_csum(sb, bg_ref.block_group,
 563                                             bitmap_block.data);
 564                 bitmap_block.dirty = true;
 565         }
 566
 567         /* Release block with bitmap */
 568         rc = ext4_block_set(fs->bdev, &bitmap_block);
 569         if (rc != EOK) {
 570                 /* Error in saving bitmap */
 571                 ext4_fs_put_block_group_ref(&bg_ref);
 572                 return rc;
 573         }
 574
 575         /* If block is not free, return */
 576         if (!(*free))
 577                 goto terminate;
 578
 579         uint32_t block_size = ext4_sb_get_block_size(sb);
 580
 581         /* Update superblock free blocks count */
 582         uint64_t sb_free_blocks = ext4_sb_get_free_blocks_cnt(sb);
 583         sb_free_blocks--;
 584         ext4_sb_set_free_blocks_cnt(sb, sb_free_blocks);
 585
 586         /* Update inode blocks count */
 587         uint64_t ino_blocks = ext4_inode_get_blocks_count(sb, inode_ref->inode);
 588         ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
 589         ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
 590         inode_ref->dirty = true;
 591
 592         /* Update block group free blocks count */
 593         uint32_t free_blocks =
 594             ext4_bg_get_free_blocks_count(bg_ref.block_group, sb);
 595         free_blocks--;
 596         ext4_bg_set_free_blocks_count(bg_ref.block_group, sb, free_blocks);
 597
 598         bg_ref.dirty = true;
 599
 600 terminate:
 601         return ext4_fs_put_block_group_ref(&bg_ref);
 602 }
 603
 604 /**
 605  * @}
 606  */