source: mainline/uspace/lib/ext4/src/balloc.c@ aab85d90

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since aab85d90 was aab85d90, checked in by Jiri Svoboda <jiri@…>, 7 years ago

Basic Ext4 filesystem creation (can only create Ext2-old, 1K blocks).
  • Property mode set to 100644
File size: 19.1 KB
Line 
1/*
2 * Copyright (c) 2018 Jiri Svoboda
3 * Copyright (c) 2012 Frantisek Princ
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * - The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30/** @addtogroup libext4
31 * @{
32 */
33/**
34 * @file balloc.c
35 * @brief Physical block allocator.
36 */
37
38#include <errno.h>
39#include <stdbool.h>
40#include <stdint.h>
41#include "ext4/balloc.h"
42#include "ext4/bitmap.h"
43#include "ext4/block_group.h"
44#include "ext4/filesystem.h"
45#include "ext4/inode.h"
46#include "ext4/superblock.h"
47#include "ext4/types.h"
48
49/** Free block.
50 *
51 * @param inode_ref Inode, where the block is allocated
52 * @param block_addr Absolute block address to free
53 *
54 * @return Error code
55 *
56 */
57errno_t ext4_balloc_free_block(ext4_inode_ref_t *inode_ref, uint32_t block_addr)
58{
59 ext4_filesystem_t *fs = inode_ref->fs;
60 ext4_superblock_t *sb = fs->superblock;
61
62 /* Compute indexes */
63 uint32_t block_group = ext4_filesystem_blockaddr2group(sb, block_addr);
64 uint32_t index_in_group =
65 ext4_filesystem_blockaddr2_index_in_group(sb, block_addr);
66
67 /* Load block group reference */
68 ext4_block_group_ref_t *bg_ref;
69 errno_t rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
70 if (rc != EOK)
71 return rc;
72
73 /* Load block with bitmap */
74 uint32_t bitmap_block_addr =
75 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
76 block_t *bitmap_block;
77 rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
78 if (rc != EOK) {
79 ext4_filesystem_put_block_group_ref(bg_ref);
80 return rc;
81 }
82
83 /* Modify bitmap */
84 ext4_bitmap_free_bit(bitmap_block->data, index_in_group);
85 bitmap_block->dirty = true;
86
87 /* Release block with bitmap */
88 rc = block_put(bitmap_block);
89 if (rc != EOK) {
90 /* Error in saving bitmap */
91 ext4_filesystem_put_block_group_ref(bg_ref);
92 return rc;
93 }
94
95 uint32_t block_size = ext4_superblock_get_block_size(sb);
96
97 /* Update superblock free blocks count */
98 uint32_t sb_free_blocks =
99 ext4_superblock_get_free_blocks_count(sb);
100 sb_free_blocks++;
101 ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
102
103 /* Update inode blocks count */
104 uint64_t ino_blocks =
105 ext4_inode_get_blocks_count(sb, inode_ref->inode);
106 ino_blocks -= block_size / EXT4_INODE_BLOCK_SIZE;
107 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
108 inode_ref->dirty = true;
109
110 /* Update block group free blocks count */
111 uint32_t free_blocks =
112 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
113 free_blocks++;
114 ext4_block_group_set_free_blocks_count(bg_ref->block_group,
115 sb, free_blocks);
116 bg_ref->dirty = true;
117
118 /* Release block group reference */
119 return ext4_filesystem_put_block_group_ref(bg_ref);
120}
121
122static errno_t ext4_balloc_free_blocks_internal(ext4_inode_ref_t *inode_ref,
123 uint32_t first, uint32_t count)
124{
125 ext4_filesystem_t *fs = inode_ref->fs;
126 ext4_superblock_t *sb = fs->superblock;
127
128 /* Compute indexes */
129 uint32_t block_group_first = ext4_filesystem_blockaddr2group(sb,
130 first);
131 uint32_t block_group_last = ext4_filesystem_blockaddr2group(sb,
132 first + count - 1);
133
134 assert(block_group_first == block_group_last);
135
136 /* Load block group reference */
137 ext4_block_group_ref_t *bg_ref;
138 errno_t rc = ext4_filesystem_get_block_group_ref(fs, block_group_first, &bg_ref);
139 if (rc != EOK)
140 return rc;
141
142 uint32_t index_in_group_first =
143 ext4_filesystem_blockaddr2_index_in_group(sb, first);
144
145 /* Load block with bitmap */
146 uint32_t bitmap_block_addr =
147 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
148
149 block_t *bitmap_block;
150 rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
151 if (rc != EOK) {
152 ext4_filesystem_put_block_group_ref(bg_ref);
153 return rc;
154 }
155
156 /* Modify bitmap */
157 ext4_bitmap_free_bits(bitmap_block->data, index_in_group_first, count);
158 bitmap_block->dirty = true;
159
160 /* Release block with bitmap */
161 rc = block_put(bitmap_block);
162 if (rc != EOK) {
163 /* Error in saving bitmap */
164 ext4_filesystem_put_block_group_ref(bg_ref);
165 return rc;
166 }
167
168 uint32_t block_size = ext4_superblock_get_block_size(sb);
169
170 /* Update superblock free blocks count */
171 uint32_t sb_free_blocks =
172 ext4_superblock_get_free_blocks_count(sb);
173 sb_free_blocks += count;
174 ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
175
176 /* Update inode blocks count */
177 uint64_t ino_blocks =
178 ext4_inode_get_blocks_count(sb, inode_ref->inode);
179 ino_blocks -= count * (block_size / EXT4_INODE_BLOCK_SIZE);
180 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
181 inode_ref->dirty = true;
182
183 /* Update block group free blocks count */
184 uint32_t free_blocks =
185 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
186 free_blocks += count;
187 ext4_block_group_set_free_blocks_count(bg_ref->block_group,
188 sb, free_blocks);
189 bg_ref->dirty = true;
190
191 /* Release block group reference */
192 return ext4_filesystem_put_block_group_ref(bg_ref);
193}
194
195/** Free continuous set of blocks.
196 *
197 * @param inode_ref Inode, where the blocks are allocated
198 * @param first First block to release
199 * @param count Number of blocks to release
200 *
201 */
202errno_t ext4_balloc_free_blocks(ext4_inode_ref_t *inode_ref,
203 uint32_t first, uint32_t count)
204{
205 errno_t r;
206 uint32_t gid;
207 uint64_t limit;
208 ext4_filesystem_t *fs = inode_ref->fs;
209 ext4_superblock_t *sb = fs->superblock;
210
211 while (count) {
212 gid = ext4_filesystem_blockaddr2group(sb, first);
213 limit = ext4_filesystem_index_in_group2blockaddr(sb, 0,
214 gid + 1);
215
216 if ((first + count) >= limit) {
217 /*
218 * This extent spans over 2 or more block groups,
219 * we'll break it into smaller parts.
220 */
221 uint32_t s = limit - first;
222
223 r = ext4_balloc_free_blocks_internal(inode_ref,
224 first, s);
225 if (r != EOK)
226 return r;
227
228 first = limit;
229 count -= s;
230 } else {
231 return ext4_balloc_free_blocks_internal(inode_ref,
232 first, count);
233 }
234 }
235
236 return EOK;
237}
238
239/** Compute first block for data in block group.
240 *
241 * @param sb Pointer to superblock
242 * @param bg Pointer to block group
243 * @param bgid Index of block group
244 *
245 * @return Absolute block index of first block
246 *
247 */
248uint32_t ext4_balloc_get_first_data_block_in_group(ext4_superblock_t *sb,
249 ext4_block_group_ref_t *bg_ref)
250{
251 uint32_t r;
252 uint64_t itable = ext4_block_group_get_inode_table_first_block(
253 bg_ref->block_group, sb);
254 uint32_t itable_sz = ext4_filesystem_bg_get_itable_size(sb,
255 bg_ref->index);
256
257 if (!ext4_superblock_has_feature_incompatible(sb,
258 EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
259 /*
260 * If we are not using FLEX_BG, the first data block
261 * is always after the inode table.
262 */
263 r = itable + itable_sz;
264 return ext4_filesystem_blockaddr2_index_in_group(sb, r);
265 }
266
267 uint64_t bbmap = ext4_block_group_get_block_bitmap(bg_ref->block_group,
268 sb);
269 uint64_t ibmap = ext4_block_group_get_inode_bitmap(bg_ref->block_group,
270 sb);
271
272 r = ext4_filesystem_index_in_group2blockaddr(sb, 0, bg_ref->index);
273 r += ext4_filesystem_bg_get_backup_blocks(bg_ref);
274
275 if (ext4_filesystem_blockaddr2group(sb, bbmap) != bg_ref->index)
276 bbmap = -1; /* Invalid */
277
278 if (ext4_filesystem_blockaddr2group(sb, ibmap) != bg_ref->index)
279 ibmap = -1;
280
281 while (true) {
282 if (r == bbmap || r == ibmap)
283 r++;
284 else if (r >= itable && r < (itable + itable_sz))
285 r = itable + itable_sz;
286 else
287 break;
288 }
289
290 return r;
291}
292
293/** Compute 'goal' for allocation algorithm.
294 *
295 * @param inode_ref Reference to inode, to allocate block for
296 *
297 * @return Goal block number
298 *
299 */
300static errno_t ext4_balloc_find_goal(ext4_inode_ref_t *inode_ref, uint32_t *goal)
301{
302 *goal = 0;
303 ext4_superblock_t *sb = inode_ref->fs->superblock;
304
305 uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
306 uint32_t block_size = ext4_superblock_get_block_size(sb);
307 uint32_t inode_block_count = inode_size / block_size;
308
309 if (inode_size % block_size != 0)
310 inode_block_count++;
311
312 /* If inode has some blocks, get last block address + 1 */
313 if (inode_block_count > 0) {
314 errno_t rc = ext4_filesystem_get_inode_data_block_index(inode_ref,
315 inode_block_count - 1, goal);
316 if (rc != EOK)
317 return rc;
318
319 if (goal != 0) {
320 (*goal)++;
321 return EOK;
322 }
323 /* If goal == 0, sparse file -> continue */
324 }
325
326 /* Identify block group of inode */
327 uint32_t inodes_per_group = ext4_superblock_get_inodes_per_group(sb);
328 uint32_t block_group = (inode_ref->index - 1) / inodes_per_group;
329
330 /* Load block group reference */
331 ext4_block_group_ref_t *bg_ref;
332 errno_t rc = ext4_filesystem_get_block_group_ref(inode_ref->fs,
333 block_group, &bg_ref);
334 if (rc != EOK)
335 return rc;
336
337 *goal = ext4_balloc_get_first_data_block_in_group(sb, bg_ref);
338
339 return ext4_filesystem_put_block_group_ref(bg_ref);
340}
341
342/** Data block allocation algorithm.
343 *
344 * @param inode_ref Inode to allocate block for
345 * @param fblock Allocated block address
346 *
347 * @return Error code
348 *
349 */
350errno_t ext4_balloc_alloc_block(ext4_inode_ref_t *inode_ref, uint32_t *fblock)
351{
352 uint32_t allocated_block = 0;
353
354 uint32_t bitmap_block_addr;
355 block_t *bitmap_block;
356 uint32_t rel_block_idx = 0;
357 uint32_t free_blocks;
358 uint32_t goal;
359 uint32_t block_size;
360
361 /* Find GOAL */
362 errno_t rc = ext4_balloc_find_goal(inode_ref, &goal);
363 if (rc != EOK)
364 return rc;
365
366 ext4_superblock_t *sb = inode_ref->fs->superblock;
367
368 /* Load block group number for goal and relative index */
369 uint32_t block_group = ext4_filesystem_blockaddr2group(sb, goal);
370 uint32_t index_in_group =
371 ext4_filesystem_blockaddr2_index_in_group(sb, goal);
372
373 /* Load block group reference */
374 ext4_block_group_ref_t *bg_ref;
375 rc = ext4_filesystem_get_block_group_ref(inode_ref->fs,
376 block_group, &bg_ref);
377 if (rc != EOK)
378 return rc;
379
380 free_blocks =
381 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
382 if (free_blocks == 0) {
383 /* This group has no free blocks */
384 goto goal_failed;
385 }
386
387 /* Compute indexes */
388 uint32_t first_in_group =
389 ext4_balloc_get_first_data_block_in_group(sb, bg_ref);
390
391 uint32_t first_in_group_index =
392 ext4_filesystem_blockaddr2_index_in_group(sb, first_in_group);
393
394 if (index_in_group < first_in_group_index)
395 index_in_group = first_in_group_index;
396
397 /* Load block with bitmap */
398 bitmap_block_addr =
399 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
400
401 rc = block_get(&bitmap_block, inode_ref->fs->device,
402 bitmap_block_addr, BLOCK_FLAGS_NONE);
403 if (rc != EOK) {
404 ext4_filesystem_put_block_group_ref(bg_ref);
405 return rc;
406 }
407
408 /* Check if goal is free */
409 if (ext4_bitmap_is_free_bit(bitmap_block->data, index_in_group)) {
410 ext4_bitmap_set_bit(bitmap_block->data, index_in_group);
411 bitmap_block->dirty = true;
412 rc = block_put(bitmap_block);
413 if (rc != EOK) {
414 ext4_filesystem_put_block_group_ref(bg_ref);
415 return rc;
416 }
417
418 allocated_block =
419 ext4_filesystem_index_in_group2blockaddr(sb, index_in_group,
420 block_group);
421
422 goto success;
423 }
424
425 uint32_t blocks_in_group =
426 ext4_superblock_get_blocks_in_group(sb, block_group);
427
428 uint32_t end_idx = (index_in_group + 63) & ~63;
429 if (end_idx > blocks_in_group)
430 end_idx = blocks_in_group;
431
432 /* Try to find free block near to goal */
433 for (uint32_t tmp_idx = index_in_group + 1; tmp_idx < end_idx;
434 ++tmp_idx) {
435 if (ext4_bitmap_is_free_bit(bitmap_block->data, tmp_idx)) {
436 ext4_bitmap_set_bit(bitmap_block->data, tmp_idx);
437 bitmap_block->dirty = true;
438 rc = block_put(bitmap_block);
439 if (rc != EOK)
440 return rc;
441
442 allocated_block =
443 ext4_filesystem_index_in_group2blockaddr(sb, tmp_idx,
444 block_group);
445
446 goto success;
447 }
448 }
449
450 /* Find free BYTE in bitmap */
451 rc = ext4_bitmap_find_free_byte_and_set_bit(bitmap_block->data,
452 index_in_group, &rel_block_idx, blocks_in_group);
453 if (rc == EOK) {
454 bitmap_block->dirty = true;
455 rc = block_put(bitmap_block);
456 if (rc != EOK)
457 return rc;
458
459 allocated_block =
460 ext4_filesystem_index_in_group2blockaddr(sb, rel_block_idx,
461 block_group);
462
463 goto success;
464 }
465
466 /* Find free bit in bitmap */
467 rc = ext4_bitmap_find_free_bit_and_set(bitmap_block->data,
468 index_in_group, &rel_block_idx, blocks_in_group);
469 if (rc == EOK) {
470 bitmap_block->dirty = true;
471 rc = block_put(bitmap_block);
472 if (rc != EOK)
473 return rc;
474
475 allocated_block =
476 ext4_filesystem_index_in_group2blockaddr(sb, rel_block_idx,
477 block_group);
478
479 goto success;
480 }
481
482 /* No free block found yet */
483 rc = block_put(bitmap_block);
484 if (rc != EOK) {
485 ext4_filesystem_put_block_group_ref(bg_ref);
486 return rc;
487 }
488
489goal_failed:
490
491 rc = ext4_filesystem_put_block_group_ref(bg_ref);
492 if (rc != EOK)
493 return rc;
494
495 /* Try other block groups */
496 uint32_t block_group_count = ext4_superblock_get_block_group_count(sb);
497
498 uint32_t bgid = (block_group + 1) % block_group_count;
499 uint32_t count = block_group_count;
500
501 while (count > 0) {
502 rc = ext4_filesystem_get_block_group_ref(inode_ref->fs, bgid,
503 &bg_ref);
504 if (rc != EOK)
505 return rc;
506
507 free_blocks =
508 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
509 if (free_blocks == 0) {
510 /* This group has no free blocks */
511 goto next_group;
512 }
513
514 /* Load block with bitmap */
515 bitmap_block_addr =
516 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
517
518 rc = block_get(&bitmap_block, inode_ref->fs->device,
519 bitmap_block_addr, 0);
520 if (rc != EOK) {
521 ext4_filesystem_put_block_group_ref(bg_ref);
522 return rc;
523 }
524
525 /* Compute indexes */
526 first_in_group =
527 ext4_balloc_get_first_data_block_in_group(sb, bg_ref);
528 index_in_group =
529 ext4_filesystem_blockaddr2_index_in_group(sb, first_in_group);
530 blocks_in_group = ext4_superblock_get_blocks_in_group(sb, bgid);
531
532 first_in_group_index =
533 ext4_filesystem_blockaddr2_index_in_group(sb, first_in_group);
534
535 if (index_in_group < first_in_group_index)
536 index_in_group = first_in_group_index;
537
538 /* Try to find free byte in bitmap */
539 rc = ext4_bitmap_find_free_byte_and_set_bit(bitmap_block->data,
540 index_in_group, &rel_block_idx, blocks_in_group);
541 if (rc == EOK) {
542 bitmap_block->dirty = true;
543 rc = block_put(bitmap_block);
544 if (rc != EOK) {
545 ext4_filesystem_put_block_group_ref(bg_ref);
546 return rc;
547 }
548
549 allocated_block =
550 ext4_filesystem_index_in_group2blockaddr(sb, rel_block_idx,
551 bgid);
552
553 goto success;
554 }
555
556 /* Try to find free bit in bitmap */
557 rc = ext4_bitmap_find_free_bit_and_set(bitmap_block->data,
558 index_in_group, &rel_block_idx, blocks_in_group);
559 if (rc == EOK) {
560 bitmap_block->dirty = true;
561 rc = block_put(bitmap_block);
562 if (rc != EOK) {
563 ext4_filesystem_put_block_group_ref(bg_ref);
564 return rc;
565 }
566
567 allocated_block =
568 ext4_filesystem_index_in_group2blockaddr(sb, rel_block_idx,
569 bgid);
570
571 goto success;
572 }
573
574 rc = block_put(bitmap_block);
575 if (rc != EOK) {
576 ext4_filesystem_put_block_group_ref(bg_ref);
577 return rc;
578 }
579
580 next_group:
581 rc = ext4_filesystem_put_block_group_ref(bg_ref);
582 if (rc != EOK)
583 return rc;
584
585 /* Goto next group */
586 bgid = (bgid + 1) % block_group_count;
587 count--;
588 }
589
590 return ENOSPC;
591
592success:
593 block_size = ext4_superblock_get_block_size(sb);
594
595 /* Update superblock free blocks count */
596 uint32_t sb_free_blocks = ext4_superblock_get_free_blocks_count(sb);
597 sb_free_blocks--;
598 ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
599
600 /* Update inode blocks (different block size!) count */
601 uint64_t ino_blocks =
602 ext4_inode_get_blocks_count(sb, inode_ref->inode);
603 ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
604 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
605 inode_ref->dirty = true;
606
607 /* Update block group free blocks count */
608 uint32_t bg_free_blocks =
609 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
610 bg_free_blocks--;
611 ext4_block_group_set_free_blocks_count(bg_ref->block_group, sb,
612 bg_free_blocks);
613 bg_ref->dirty = true;
614
615 rc = ext4_filesystem_put_block_group_ref(bg_ref);
616
617 *fblock = allocated_block;
618 return rc;
619}
620
621/** Try to allocate concrete block.
622 *
623 * @param inode_ref Inode to allocate block for
624 * @param fblock Block address to allocate
625 * @param free Output value - if target block is free
626 *
627 * @return Error code
628 *
629 */
630errno_t ext4_balloc_try_alloc_block(ext4_inode_ref_t *inode_ref, uint32_t fblock,
631 bool *free)
632{
633 errno_t rc;
634
635 ext4_filesystem_t *fs = inode_ref->fs;
636 ext4_superblock_t *sb = fs->superblock;
637
638 /* Compute indexes */
639 uint32_t block_group = ext4_filesystem_blockaddr2group(sb, fblock);
640 uint32_t index_in_group =
641 ext4_filesystem_blockaddr2_index_in_group(sb, fblock);
642
643 /* Load block group reference */
644 ext4_block_group_ref_t *bg_ref;
645 rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
646 if (rc != EOK)
647 return rc;
648
649 /* Load block with bitmap */
650 uint32_t bitmap_block_addr =
651 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
652 block_t *bitmap_block;
653 rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
654 if (rc != EOK) {
655 ext4_filesystem_put_block_group_ref(bg_ref);
656 return rc;
657 }
658
659 /* Check if block is free */
660 *free = ext4_bitmap_is_free_bit(bitmap_block->data, index_in_group);
661
662 /* Allocate block if possible */
663 if (*free) {
664 ext4_bitmap_set_bit(bitmap_block->data, index_in_group);
665 bitmap_block->dirty = true;
666 }
667
668 /* Release block with bitmap */
669 rc = block_put(bitmap_block);
670 if (rc != EOK) {
671 /* Error in saving bitmap */
672 ext4_filesystem_put_block_group_ref(bg_ref);
673 return rc;
674 }
675
676 /* If block is not free, return */
677 if (!(*free))
678 goto terminate;
679
680 uint32_t block_size = ext4_superblock_get_block_size(sb);
681
682 /* Update superblock free blocks count */
683 uint32_t sb_free_blocks = ext4_superblock_get_free_blocks_count(sb);
684 sb_free_blocks--;
685 ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
686
687 /* Update inode blocks count */
688 uint64_t ino_blocks =
689 ext4_inode_get_blocks_count(sb, inode_ref->inode);
690 ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
691 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
692 inode_ref->dirty = true;
693
694 /* Update block group free blocks count */
695 uint32_t free_blocks =
696 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
697 free_blocks--;
698 ext4_block_group_set_free_blocks_count(bg_ref->block_group,
699 sb, free_blocks);
700 bg_ref->dirty = true;
701
702terminate:
703 return ext4_filesystem_put_block_group_ref(bg_ref);
704}
705
706/**
707 * @}
708 */
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