source: mainline/uspace/lib/ext4/libext4_balloc.c@ a159c6a

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since a159c6a was a159c6a, checked in by Maurizio Lombardi <m.lombardi85@…>, 12 years ago

ext4: release the block group in case of error.
  • Property mode set to 100644
File size: 19.0 KB
Line 
1/*
2 * Copyright (c) 2012 Frantisek Princ
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libext4
30 * @{
31 */
32/**
33 * @file libext4_balloc.c
34 * @brief Physical block allocator.
35 */
36
37#include <errno.h>
38#include <sys/types.h>
39#include "libext4.h"
40
41/** Compute number of block group from block address.
42 *
43 * @param sb Superblock pointer.
44 * @param block_addr Absolute address of block.
45 *
46 * @return Block group index
47 *
48 */
49static uint32_t ext4_balloc_get_bgid_of_block(ext4_superblock_t *sb,
50 uint32_t block_addr)
51{
52 uint32_t blocks_per_group =
53 ext4_superblock_get_blocks_per_group(sb);
54 uint32_t first_block =
55 ext4_superblock_get_first_data_block(sb);
56
57 /* First block == 0 or 1 */
58 if (first_block == 0)
59 return block_addr / blocks_per_group;
60 else
61 return (block_addr - 1) / blocks_per_group;
62}
63
64/** Free block.
65 *
66 * @param inode_ref Inode, where the block is allocated
67 * @param block_addr Absolute block address to free
68 *
69 * @return Error code
70 *
71 */
72int ext4_balloc_free_block(ext4_inode_ref_t *inode_ref, uint32_t block_addr)
73{
74 ext4_filesystem_t *fs = inode_ref->fs;
75 ext4_superblock_t *sb = fs->superblock;
76
77 /* Compute indexes */
78 uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, block_addr);
79 uint32_t index_in_group =
80 ext4_filesystem_blockaddr2_index_in_group(sb, block_addr);
81
82 /* Load block group reference */
83 ext4_block_group_ref_t *bg_ref;
84 int rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
85 if (rc != EOK)
86 return rc;
87
88 /* Load block with bitmap */
89 uint32_t bitmap_block_addr =
90 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
91 block_t *bitmap_block;
92 rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
93 if (rc != EOK)
94 return rc;
95
96 /* Modify bitmap */
97 ext4_bitmap_free_bit(bitmap_block->data, index_in_group);
98 bitmap_block->dirty = true;
99
100 /* Release block with bitmap */
101 rc = block_put(bitmap_block);
102 if (rc != EOK) {
103 /* Error in saving bitmap */
104 ext4_filesystem_put_block_group_ref(bg_ref);
105 return rc;
106 }
107
108 uint32_t block_size = ext4_superblock_get_block_size(sb);
109
110 /* Update superblock free blocks count */
111 uint32_t sb_free_blocks =
112 ext4_superblock_get_free_blocks_count(sb);
113 sb_free_blocks++;
114 ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
115
116 /* Update inode blocks count */
117 uint64_t ino_blocks =
118 ext4_inode_get_blocks_count(sb, inode_ref->inode);
119 ino_blocks -= block_size / EXT4_INODE_BLOCK_SIZE;
120 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
121 inode_ref->dirty = true;
122
123 /* Update block group free blocks count */
124 uint32_t free_blocks =
125 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
126 free_blocks++;
127 ext4_block_group_set_free_blocks_count(bg_ref->block_group,
128 sb, free_blocks);
129 bg_ref->dirty = true;
130
131 /* Release block group reference */
132 return ext4_filesystem_put_block_group_ref(bg_ref);
133}
134
135/** Free continuous set of blocks.
136 *
137 * @param inode_ref Inode, where the blocks are allocated
138 * @param first First block to release
139 * @param count Number of blocks to release
140 *
141 */
142int ext4_balloc_free_blocks(ext4_inode_ref_t *inode_ref,
143 uint32_t first, uint32_t count)
144{
145 ext4_filesystem_t *fs = inode_ref->fs;
146 ext4_superblock_t *sb = fs->superblock;
147
148 /* Compute indexes */
149 uint32_t block_group_first =
150 ext4_balloc_get_bgid_of_block(sb, first);
151 uint32_t block_group_last =
152 ext4_balloc_get_bgid_of_block(sb, first + count - 1);
153
154 assert(block_group_first == block_group_last);
155
156 /* Load block group reference */
157 ext4_block_group_ref_t *bg_ref;
158 int rc = ext4_filesystem_get_block_group_ref(fs, block_group_first, &bg_ref);
159 if (rc != EOK)
160 return rc;
161
162 uint32_t index_in_group_first =
163 ext4_filesystem_blockaddr2_index_in_group(sb, first);
164
165 /* Load block with bitmap */
166 uint32_t bitmap_block_addr =
167 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
168
169 block_t *bitmap_block;
170 rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
171 if (rc != EOK) {
172 ext4_filesystem_put_block_group_ref(bg_ref);
173 return rc;
174 }
175
176 /* Modify bitmap */
177 ext4_bitmap_free_bits(bitmap_block->data, index_in_group_first, count);
178 bitmap_block->dirty = true;
179
180 /* Release block with bitmap */
181 rc = block_put(bitmap_block);
182 if (rc != EOK) {
183 /* Error in saving bitmap */
184 ext4_filesystem_put_block_group_ref(bg_ref);
185 return rc;
186 }
187
188 uint32_t block_size = ext4_superblock_get_block_size(sb);
189
190 /* Update superblock free blocks count */
191 uint32_t sb_free_blocks =
192 ext4_superblock_get_free_blocks_count(sb);
193 sb_free_blocks += count;
194 ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
195
196 /* Update inode blocks count */
197 uint64_t ino_blocks =
198 ext4_inode_get_blocks_count(sb, inode_ref->inode);
199 ino_blocks -= count * (block_size / EXT4_INODE_BLOCK_SIZE);
200 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
201 inode_ref->dirty = true;
202
203 /* Update block group free blocks count */
204 uint32_t free_blocks =
205 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
206 free_blocks += count;
207 ext4_block_group_set_free_blocks_count(bg_ref->block_group,
208 sb, free_blocks);
209 bg_ref->dirty = true;
210
211 /* Release block group reference */
212 return ext4_filesystem_put_block_group_ref(bg_ref);
213}
214
215/** Compute first block for data in block group.
216 *
217 * @param sb Pointer to superblock
218 * @param bg Pointer to block group
219 * @param bgid Index of block group
220 *
221 * @return Absolute block index of first block
222 *
223 */
224uint32_t ext4_balloc_get_first_data_block_in_group(ext4_superblock_t *sb,
225 ext4_block_group_ref_t *bg_ref)
226{
227 uint32_t block_group_count = ext4_superblock_get_block_group_count(sb);
228 uint32_t inode_table_first_block =
229 ext4_block_group_get_inode_table_first_block(bg_ref->block_group, sb);
230 uint16_t inode_table_item_size = ext4_superblock_get_inode_size(sb);
231 uint32_t inodes_per_group = ext4_superblock_get_inodes_per_group(sb);
232 uint32_t block_size = ext4_superblock_get_block_size(sb);
233 uint32_t inode_table_bytes;
234
235 if (bg_ref->index < block_group_count - 1) {
236 inode_table_bytes = inodes_per_group * inode_table_item_size;
237 } else {
238 /* Last block group could be smaller */
239 uint32_t inodes_count_total = ext4_superblock_get_inodes_count(sb);
240 inode_table_bytes =
241 (inodes_count_total - ((block_group_count - 1) * inodes_per_group)) *
242 inode_table_item_size;
243 }
244
245 uint32_t inode_table_blocks = inode_table_bytes / block_size;
246
247 if (inode_table_bytes % block_size)
248 inode_table_blocks++;
249
250 return inode_table_first_block + inode_table_blocks;
251}
252
253/** Compute 'goal' for allocation algorithm.
254 *
255 * @param inode_ref Reference to inode, to allocate block for
256 *
257 * @return Goal block number
258 *
259 */
260static int ext4_balloc_find_goal(ext4_inode_ref_t *inode_ref, uint32_t *goal)
261{
262 *goal = 0;
263 ext4_superblock_t *sb = inode_ref->fs->superblock;
264
265 uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
266 uint32_t block_size = ext4_superblock_get_block_size(sb);
267 uint32_t inode_block_count = inode_size / block_size;
268
269 if (inode_size % block_size != 0)
270 inode_block_count++;
271
272 /* If inode has some blocks, get last block address + 1 */
273 if (inode_block_count > 0) {
274 int rc = ext4_filesystem_get_inode_data_block_index(inode_ref,
275 inode_block_count - 1, goal);
276 if (rc != EOK)
277 return rc;
278
279 if (goal != 0) {
280 (*goal)++;
281 return EOK;
282 }
283
284 /* If goal == 0, sparse file -> continue */
285 }
286
287 /* Identify block group of inode */
288 uint32_t inodes_per_group = ext4_superblock_get_inodes_per_group(sb);
289 uint32_t block_group = (inode_ref->index - 1) / inodes_per_group;
290 block_size = ext4_superblock_get_block_size(sb);
291
292 /* Load block group reference */
293 ext4_block_group_ref_t *bg_ref;
294 int rc = ext4_filesystem_get_block_group_ref(inode_ref->fs,
295 block_group, &bg_ref);
296 if (rc != EOK)
297 return rc;
298
299 /* Compute indexes */
300 uint32_t block_group_count = ext4_superblock_get_block_group_count(sb);
301 uint32_t inode_table_first_block =
302 ext4_block_group_get_inode_table_first_block(bg_ref->block_group, sb);
303 uint16_t inode_table_item_size = ext4_superblock_get_inode_size(sb);
304 uint32_t inode_table_bytes;
305
306 /* Check for last block group */
307 if (block_group < block_group_count - 1) {
308 inode_table_bytes = inodes_per_group * inode_table_item_size;
309 } else {
310 /* Last block group could be smaller */
311 uint32_t inodes_count_total = ext4_superblock_get_inodes_count(sb);
312 inode_table_bytes =
313 (inodes_count_total - ((block_group_count - 1) * inodes_per_group)) *
314 inode_table_item_size;
315 }
316
317 uint32_t inode_table_blocks = inode_table_bytes / block_size;
318
319 if (inode_table_bytes % block_size)
320 inode_table_blocks++;
321
322 *goal = inode_table_first_block + inode_table_blocks;
323
324 return ext4_filesystem_put_block_group_ref(bg_ref);
325}
326
327/** Data block allocation algorithm.
328 *
329 * @param inode_ref Inode to allocate block for
330 * @param fblock Allocated block address
331 *
332 * @return Error code
333 *
334 */
335int ext4_balloc_alloc_block(ext4_inode_ref_t *inode_ref, uint32_t *fblock)
336{
337 uint32_t allocated_block = 0;
338
339 uint32_t bitmap_block_addr;
340 block_t *bitmap_block;
341 uint32_t rel_block_idx = 0;
342 uint32_t goal;
343
344 /* Find GOAL */
345 int rc = ext4_balloc_find_goal(inode_ref, &goal);
346 if (rc != EOK)
347 return rc;
348 else if (goal == 0) {
349 /* no goal found => partition is full */
350 return ENOMEM;
351 }
352
353 ext4_superblock_t *sb = inode_ref->fs->superblock;
354
355 /* Load block group number for goal and relative index */
356 uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, goal);
357 uint32_t index_in_group =
358 ext4_filesystem_blockaddr2_index_in_group(sb, goal);
359
360 /* Load block group reference */
361 ext4_block_group_ref_t *bg_ref;
362 rc = ext4_filesystem_get_block_group_ref(inode_ref->fs,
363 block_group, &bg_ref);
364 if (rc != EOK)
365 return rc;
366
367 /* Compute indexes */
368 uint32_t first_in_group =
369 ext4_balloc_get_first_data_block_in_group(sb, bg_ref);
370
371 uint32_t first_in_group_index =
372 ext4_filesystem_blockaddr2_index_in_group(sb, first_in_group);
373
374 if (index_in_group < first_in_group_index)
375 index_in_group = first_in_group_index;
376
377 /* Load block with bitmap */
378 bitmap_block_addr =
379 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
380
381 rc = block_get(&bitmap_block, inode_ref->fs->device,
382 bitmap_block_addr, BLOCK_FLAGS_NONE);
383 if (rc != EOK) {
384 ext4_filesystem_put_block_group_ref(bg_ref);
385 return rc;
386 }
387
388 /* Check if goal is free */
389 if (ext4_bitmap_is_free_bit(bitmap_block->data, index_in_group)) {
390 ext4_bitmap_set_bit(bitmap_block->data, index_in_group);
391 bitmap_block->dirty = true;
392 rc = block_put(bitmap_block);
393 if (rc != EOK) {
394 ext4_filesystem_put_block_group_ref(bg_ref);
395 return rc;
396 }
397
398 allocated_block =
399 ext4_filesystem_index_in_group2blockaddr(sb, index_in_group,
400 block_group);
401
402 goto success;
403 }
404
405 uint32_t blocks_in_group =
406 ext4_superblock_get_blocks_in_group(sb, block_group);
407
408 uint32_t end_idx = (index_in_group + 63) & ~63;
409 if (end_idx > blocks_in_group)
410 end_idx = blocks_in_group;
411
412 /* Try to find free block near to goal */
413 for (uint32_t tmp_idx = index_in_group + 1; tmp_idx < end_idx;
414 ++tmp_idx) {
415 if (ext4_bitmap_is_free_bit(bitmap_block->data, tmp_idx)) {
416 ext4_bitmap_set_bit(bitmap_block->data, tmp_idx);
417 bitmap_block->dirty = true;
418 rc = block_put(bitmap_block);
419 if (rc != EOK)
420 return rc;
421
422 allocated_block =
423 ext4_filesystem_index_in_group2blockaddr(sb, tmp_idx,
424 block_group);
425
426 goto success;
427 }
428 }
429
430 /* Find free BYTE in bitmap */
431 rc = ext4_bitmap_find_free_byte_and_set_bit(bitmap_block->data,
432 index_in_group, &rel_block_idx, blocks_in_group);
433 if (rc == EOK) {
434 bitmap_block->dirty = true;
435 rc = block_put(bitmap_block);
436 if (rc != EOK)
437 return rc;
438
439 allocated_block =
440 ext4_filesystem_index_in_group2blockaddr(sb, rel_block_idx,
441 block_group);
442
443 goto success;
444 }
445
446 /* Find free bit in bitmap */
447 rc = ext4_bitmap_find_free_bit_and_set(bitmap_block->data,
448 index_in_group, &rel_block_idx, blocks_in_group);
449 if (rc == EOK) {
450 bitmap_block->dirty = true;
451 rc = block_put(bitmap_block);
452 if (rc != EOK)
453 return rc;
454
455 allocated_block =
456 ext4_filesystem_index_in_group2blockaddr(sb, rel_block_idx,
457 block_group);
458
459 goto success;
460 }
461
462 /* No free block found yet */
463 rc = block_put(bitmap_block);
464 if (rc != EOK) {
465 ext4_filesystem_put_block_group_ref(bg_ref);
466 return rc;
467 }
468
469 rc = ext4_filesystem_put_block_group_ref(bg_ref);
470 if (rc != EOK)
471 return rc;
472
473 /* Try other block groups */
474 uint32_t block_group_count = ext4_superblock_get_block_group_count(sb);
475
476 uint32_t bgid = (block_group + 1) % block_group_count;
477 uint32_t count = block_group_count;
478
479 while (count > 0) {
480 rc = ext4_filesystem_get_block_group_ref(inode_ref->fs, bgid,
481 &bg_ref);
482 if (rc != EOK)
483 return rc;
484
485 /* Load block with bitmap */
486 bitmap_block_addr =
487 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
488
489 rc = block_get(&bitmap_block, inode_ref->fs->device,
490 bitmap_block_addr, 0);
491 if (rc != EOK) {
492 ext4_filesystem_put_block_group_ref(bg_ref);
493 return rc;
494 }
495
496 /* Compute indexes */
497 first_in_group =
498 ext4_balloc_get_first_data_block_in_group(sb, bg_ref);
499 index_in_group =
500 ext4_filesystem_blockaddr2_index_in_group(sb, first_in_group);
501 blocks_in_group = ext4_superblock_get_blocks_in_group(sb, bgid);
502
503 first_in_group_index =
504 ext4_filesystem_blockaddr2_index_in_group(sb, first_in_group);
505
506 if (index_in_group < first_in_group_index)
507 index_in_group = first_in_group_index;
508
509 /* Try to find free byte in bitmap */
510 rc = ext4_bitmap_find_free_byte_and_set_bit(bitmap_block->data,
511 index_in_group, &rel_block_idx, blocks_in_group);
512 if (rc == EOK) {
513 bitmap_block->dirty = true;
514 rc = block_put(bitmap_block);
515 if (rc != EOK)
516 return rc;
517
518 allocated_block =
519 ext4_filesystem_index_in_group2blockaddr(sb, rel_block_idx,
520 bgid);
521
522 goto success;
523 }
524
525 /* Try to find free bit in bitmap */
526 rc = ext4_bitmap_find_free_bit_and_set(bitmap_block->data,
527 index_in_group, &rel_block_idx, blocks_in_group);
528 if (rc == EOK) {
529 bitmap_block->dirty = true;
530 rc = block_put(bitmap_block);
531 if (rc != EOK)
532 return rc;
533
534 allocated_block =
535 ext4_filesystem_index_in_group2blockaddr(sb, rel_block_idx,
536 bgid);
537
538 goto success;
539 }
540
541 rc = block_put(bitmap_block);
542 if (rc != EOK) {
543 ext4_filesystem_put_block_group_ref(bg_ref);
544 return rc;
545 }
546
547 rc = ext4_filesystem_put_block_group_ref(bg_ref);
548 if (rc != EOK)
549 return rc;
550
551 /* Goto next group */
552 bgid = (bgid + 1) % block_group_count;
553 count--;
554 }
555
556 return ENOSPC;
557
558success:
559 /* Empty command - because of syntax */
560 ;
561
562 uint32_t block_size = ext4_superblock_get_block_size(sb);
563
564 /* Update superblock free blocks count */
565 uint32_t sb_free_blocks = ext4_superblock_get_free_blocks_count(sb);
566 sb_free_blocks--;
567 ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
568
569 /* Update inode blocks (different block size!) count */
570 uint64_t ino_blocks =
571 ext4_inode_get_blocks_count(sb, inode_ref->inode);
572 ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
573 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
574 inode_ref->dirty = true;
575
576 /* Update block group free blocks count */
577 uint32_t bg_free_blocks =
578 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
579 bg_free_blocks--;
580 ext4_block_group_set_free_blocks_count(bg_ref->block_group, sb,
581 bg_free_blocks);
582 bg_ref->dirty = true;
583
584 rc = ext4_filesystem_put_block_group_ref(bg_ref);
585
586 *fblock = allocated_block;
587 return rc;
588}
589
590/** Try to allocate concrete block.
591 *
592 * @param inode_ref Inode to allocate block for
593 * @param fblock Block address to allocate
594 * @param free Output value - if target block is free
595 *
596 * @return Error code
597 *
598 */
599int ext4_balloc_try_alloc_block(ext4_inode_ref_t *inode_ref, uint32_t fblock,
600 bool *free)
601{
602 int rc = EOK;
603
604 ext4_filesystem_t *fs = inode_ref->fs;
605 ext4_superblock_t *sb = fs->superblock;
606
607 /* Compute indexes */
608 uint32_t block_group = ext4_balloc_get_bgid_of_block(sb, fblock);
609 uint32_t index_in_group =
610 ext4_filesystem_blockaddr2_index_in_group(sb, fblock);
611
612 /* Load block group reference */
613 ext4_block_group_ref_t *bg_ref;
614 rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
615 if (rc != EOK)
616 return rc;
617
618 /* Load block with bitmap */
619 uint32_t bitmap_block_addr =
620 ext4_block_group_get_block_bitmap(bg_ref->block_group, sb);
621 block_t *bitmap_block;
622 rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
623 if (rc != EOK)
624 return rc;
625
626 /* Check if block is free */
627 *free = ext4_bitmap_is_free_bit(bitmap_block->data, index_in_group);
628
629 /* Allocate block if possible */
630 if (*free) {
631 ext4_bitmap_set_bit(bitmap_block->data, index_in_group);
632 bitmap_block->dirty = true;
633 }
634
635 /* Release block with bitmap */
636 rc = block_put(bitmap_block);
637 if (rc != EOK) {
638 /* Error in saving bitmap */
639 ext4_filesystem_put_block_group_ref(bg_ref);
640 return rc;
641 }
642
643 /* If block is not free, return */
644 if (!(*free))
645 goto terminate;
646
647 uint32_t block_size = ext4_superblock_get_block_size(sb);
648
649 /* Update superblock free blocks count */
650 uint32_t sb_free_blocks = ext4_superblock_get_free_blocks_count(sb);
651 sb_free_blocks--;
652 ext4_superblock_set_free_blocks_count(sb, sb_free_blocks);
653
654 /* Update inode blocks count */
655 uint64_t ino_blocks =
656 ext4_inode_get_blocks_count(sb, inode_ref->inode);
657 ino_blocks += block_size / EXT4_INODE_BLOCK_SIZE;
658 ext4_inode_set_blocks_count(sb, inode_ref->inode, ino_blocks);
659 inode_ref->dirty = true;
660
661 /* Update block group free blocks count */
662 uint32_t free_blocks =
663 ext4_block_group_get_free_blocks_count(bg_ref->block_group, sb);
664 free_blocks--;
665 ext4_block_group_set_free_blocks_count(bg_ref->block_group,
666 sb, free_blocks);
667 bg_ref->dirty = true;
668
669terminate:
670 return ext4_filesystem_put_block_group_ref(bg_ref);
671}
672
673/**
674 * @}
675 */
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