source: mainline/uspace/lib/ext4/libext4_filesystem.c@ 5f6cb14

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 5f6cb14 was 3d4fd2c, checked in by Frantisek Princ <frantisek.princ@…>, 14 years ago

deleting regular files (directories is not debugged)
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File size: 18.6 KB
Line 
1/*
2 * Copyright (c) 2011 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/**
34 * @file libext4_filesystem.c
35 * @brief TODO
36 */
37
38#include <byteorder.h>
39#include <errno.h>
40#include <malloc.h>
41#include "libext4.h"
42
43int ext4_filesystem_init(ext4_filesystem_t *fs, service_id_t service_id)
44{
45 int rc;
46 ext4_superblock_t *temp_superblock;
47 size_t block_size;
48 uint32_t block_ids_per_block;
49 int i;
50
51 fs->device = service_id;
52
53 // TODO what does constant 2048 mean?
54 rc = block_init(EXCHANGE_SERIALIZE, fs->device, 2048);
55 if (rc != EOK) {
56 return rc;
57 }
58
59 /* Read superblock from device */
60 rc = ext4_superblock_read_direct(fs->device, &temp_superblock);
61 if (rc != EOK) {
62 block_fini(fs->device);
63 return rc;
64 }
65
66 /* Read block size from superblock and check */
67 block_size = ext4_superblock_get_block_size(temp_superblock);
68 if (block_size > EXT4_MAX_BLOCK_SIZE) {
69 block_fini(fs->device);
70 return ENOTSUP;
71 }
72
73 /* Initialize block caching */
74 rc = block_cache_init(service_id, block_size, 0, CACHE_MODE_WT);
75 if (rc != EOK) {
76 block_fini(fs->device);
77 return rc;
78 }
79
80 block_ids_per_block = block_size / sizeof(uint32_t);
81 fs->inode_block_limits[0] = EXT4_INODE_DIRECT_BLOCK_COUNT;
82 fs->inode_blocks_per_level[0] = 1;
83 for (i = 1; i < 4; i++) {
84 fs->inode_blocks_per_level[i] = fs->inode_blocks_per_level[i-1] *
85 block_ids_per_block;
86 fs->inode_block_limits[i] = fs->inode_block_limits[i-1] +
87 fs->inode_blocks_per_level[i];
88 }
89
90 /* Return loaded superblock */
91 fs->superblock = temp_superblock;
92
93 return EOK;
94}
95
96int ext4_filesystem_fini(ext4_filesystem_t *fs, bool write_sb)
97{
98 int rc = EOK;
99 if (write_sb) {
100 rc = ext4_superblock_write_direct(fs->device, fs->superblock);
101 }
102
103 free(fs->superblock);
104 block_fini(fs->device);
105
106 return rc;
107}
108
109int ext4_filesystem_check_sanity(ext4_filesystem_t *fs)
110{
111 int rc;
112
113 rc = ext4_superblock_check_sanity(fs->superblock);
114 if (rc != EOK) {
115 return rc;
116 }
117
118 return EOK;
119}
120
121int ext4_filesystem_check_features(ext4_filesystem_t *fs, bool *o_read_only)
122{
123 /* Feature flags are present in rev 1 and later */
124 if (ext4_superblock_get_rev_level(fs->superblock) == 0) {
125 *o_read_only = false;
126 return EOK;
127 }
128
129 uint32_t incompatible_features;
130 incompatible_features = ext4_superblock_get_features_incompatible(fs->superblock);
131 incompatible_features &= ~EXT4_FEATURE_INCOMPAT_SUPP;
132 if (incompatible_features > 0) {
133 *o_read_only = true;
134 return ENOTSUP;
135 }
136
137 uint32_t compatible_read_only;
138 compatible_read_only = ext4_superblock_get_features_read_only(fs->superblock);
139 compatible_read_only &= ~EXT4_FEATURE_RO_COMPAT_SUPP;
140 if (compatible_read_only > 0) {
141 *o_read_only = true;
142 }
143
144 return EOK;
145}
146
147int ext4_filesystem_get_block_group_ref(ext4_filesystem_t *fs, uint32_t bgid,
148 ext4_block_group_ref_t **ref)
149{
150 int rc;
151 aoff64_t block_id;
152 uint32_t descriptors_per_block;
153 size_t offset;
154 ext4_block_group_ref_t *newref;
155
156 newref = malloc(sizeof(ext4_block_group_ref_t));
157 if (newref == NULL) {
158 return ENOMEM;
159 }
160
161 descriptors_per_block = ext4_superblock_get_block_size(fs->superblock)
162 / ext4_superblock_get_desc_size(fs->superblock);
163
164 /* Block group descriptor table starts at the next block after superblock */
165 block_id = ext4_superblock_get_first_data_block(fs->superblock) + 1;
166
167 /* Find the block containing the descriptor we are looking for */
168 block_id += bgid / descriptors_per_block;
169 offset = (bgid % descriptors_per_block) * ext4_superblock_get_desc_size(fs->superblock);
170
171 rc = block_get(&newref->block, fs->device, block_id, 0);
172 if (rc != EOK) {
173 free(newref);
174 return rc;
175 }
176
177 newref->block_group = newref->block->data + offset;
178 newref->dirty = false;
179
180 *ref = newref;
181
182 return EOK;
183}
184
185int ext4_filesystem_put_block_group_ref(ext4_block_group_ref_t *ref)
186{
187 int rc;
188
189 if (ref->dirty) {
190 ref->block->dirty = true;
191 }
192
193 rc = block_put(ref->block);
194 free(ref);
195
196 return rc;
197}
198
199int ext4_filesystem_get_inode_ref(ext4_filesystem_t *fs, uint32_t index,
200 ext4_inode_ref_t **ref)
201{
202 int rc;
203 aoff64_t block_id;
204 uint32_t block_group;
205 uint32_t offset_in_group;
206 uint32_t byte_offset_in_group;
207 size_t offset_in_block;
208 uint32_t inodes_per_group;
209 uint32_t inode_table_start;
210 uint16_t inode_size;
211 uint32_t block_size;
212 ext4_block_group_ref_t *bg_ref;
213 ext4_inode_ref_t *newref;
214
215 newref = malloc(sizeof(ext4_inode_ref_t));
216 if (newref == NULL) {
217 return ENOMEM;
218 }
219
220 inodes_per_group = ext4_superblock_get_inodes_per_group(fs->superblock);
221
222 /* inode numbers are 1-based, but it is simpler to work with 0-based
223 * when computing indices
224 */
225 index -= 1;
226 block_group = index / inodes_per_group;
227 offset_in_group = index % inodes_per_group;
228
229 rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
230 if (rc != EOK) {
231 free(newref);
232 return rc;
233 }
234
235 inode_table_start = ext4_block_group_get_inode_table_first_block(
236 bg_ref->block_group, fs->superblock);
237
238 rc = ext4_filesystem_put_block_group_ref(bg_ref);
239 if (rc != EOK) {
240 free(newref);
241 return rc;
242 }
243
244 inode_size = ext4_superblock_get_inode_size(fs->superblock);
245 block_size = ext4_superblock_get_block_size(fs->superblock);
246
247 byte_offset_in_group = offset_in_group * inode_size;
248
249 block_id = inode_table_start + (byte_offset_in_group / block_size);
250 offset_in_block = byte_offset_in_group % block_size;
251
252 rc = block_get(&newref->block, fs->device, block_id, 0);
253 if (rc != EOK) {
254 free(newref);
255 return rc;
256 }
257
258 newref->inode = newref->block->data + offset_in_block;
259 /* we decremented index above, but need to store the original value
260 * in the reference
261 */
262 newref->index = index+1;
263 newref->dirty = false;
264
265 *ref = newref;
266
267 return EOK;
268}
269
270
271int ext4_filesystem_put_inode_ref(ext4_inode_ref_t *ref)
272{
273 int rc;
274
275 if (ref->dirty) {
276 ref->block->dirty = true;
277 }
278
279 rc = block_put(ref->block);
280 free(ref);
281
282 return rc;
283}
284
285int ext4_filesystem_free_inode(ext4_filesystem_t *fs, ext4_inode_ref_t *inode_ref)
286{
287 int rc;
288 // release all indirect blocks
289
290 uint32_t fblock;
291
292 // 1) Single indirect
293 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 0);
294 if (fblock != 0) {
295 rc = ext4_balloc_free_block(fs, inode_ref, fblock);
296 if (rc != EOK) {
297 // TODO error
298 }
299
300 ext4_inode_set_indirect_block(inode_ref->inode, 0, 0);
301 }
302
303 block_t *block;
304 uint32_t block_size = ext4_superblock_get_block_size(fs->superblock);
305 uint32_t count = block_size / sizeof(uint32_t);
306
307 // 2) Double indirect
308 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 1);
309 if (fblock != 0) {
310 rc = block_get(&block, fs->device, fblock, BLOCK_FLAGS_NONE);
311 if (rc != EOK) {
312 // TODO error
313 }
314
315 uint32_t ind_block;
316 for (uint32_t offset = 0; offset < count; ++offset) {
317 ind_block = uint32_t_le2host(((uint32_t*)block->data)[offset]);
318
319 if (ind_block != 0) {
320 rc = ext4_balloc_free_block(fs, inode_ref, ind_block);
321 if (rc != EOK) {
322 // TODO error
323 }
324 }
325 }
326
327 block_put(block);
328 rc = ext4_balloc_free_block(fs, inode_ref, fblock);
329 if (rc != EOK) {
330 // TODO error
331 }
332
333 ext4_inode_set_indirect_block(inode_ref->inode, 1, 0);
334 }
335
336
337 // 3) Tripple indirect
338 block_t *subblock;
339 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 2);
340 if (fblock != 0) {
341 rc = block_get(&block, fs->device, fblock, BLOCK_FLAGS_NONE);
342 if (rc != EOK) {
343 // TODO error
344 }
345
346 uint32_t ind_block;
347 for (uint32_t offset = 0; offset < count; ++offset) {
348 ind_block = uint32_t_le2host(((uint32_t*)block->data)[offset]);
349
350 if (ind_block != 0) {
351 rc = block_get(&subblock, fs->device, ind_block, BLOCK_FLAGS_NONE);
352 if (rc != EOK) {
353 // TODO error
354 }
355
356 uint32_t ind_subblock;
357 for (uint32_t suboffset = 0; suboffset < count; ++suboffset) {
358 ind_subblock = uint32_t_le2host(((uint32_t*)subblock->data)[suboffset]);
359
360 if (ind_subblock != 0) {
361 rc = ext4_balloc_free_block(fs, inode_ref, ind_subblock);
362 if (rc != EOK) {
363 // TODO error
364 }
365 }
366
367 }
368 block_put(subblock);
369
370 }
371
372 rc = ext4_balloc_free_block(fs, inode_ref, ind_block);
373 if (rc != EOK) {
374 // TODO error
375 }
376
377
378 }
379
380 block_put(block);
381 rc = ext4_balloc_free_block(fs, inode_ref, fblock);
382 if (rc != EOK) {
383 // TODO error
384 }
385
386 ext4_inode_set_indirect_block(inode_ref->inode, 2, 0);
387 }
388
389 // Free inode
390 rc = ext4_ialloc_free_inode(fs, inode_ref);
391 if (rc != EOK) {
392 return rc;
393 }
394
395 return EOK;
396}
397
398int ext4_filesystem_truncate_inode(ext4_filesystem_t *fs,
399 ext4_inode_ref_t *inode_ref, aoff64_t new_size)
400{
401 aoff64_t old_size;
402 aoff64_t size_diff;
403
404 if (! ext4_inode_can_truncate(fs->superblock, inode_ref->inode)) {
405 // Unable to truncate
406 return EINVAL;
407 }
408
409 old_size = ext4_inode_get_size(fs->superblock, inode_ref->inode);
410
411 if (old_size == new_size) {
412 // Nothing to do
413 return EOK;
414 }
415
416 uint32_t block_size;
417 uint32_t blocks_count, total_blocks;
418 uint32_t i;
419
420 block_size = ext4_superblock_get_block_size(fs->superblock);
421
422 if (old_size < new_size) {
423 // Currently not supported to expand the file
424 // TODO
425 EXT4FS_DBG("trying to expand the file");
426 return EINVAL;
427 }
428
429 size_diff = old_size - new_size;
430 blocks_count = size_diff / block_size;
431 if (size_diff % block_size != 0) {
432 blocks_count++;
433 }
434
435 total_blocks = old_size / block_size;
436 if (old_size % block_size != 0) {
437 total_blocks++;
438 }
439
440 // starting from 1 because of logical blocks are numbered from 0
441 for (i = 1; i <= blocks_count; ++i) {
442 // TODO check retval
443 // TODO decrement inode->blocks_count
444
445 ext4_filesystem_release_inode_block(fs, inode_ref, total_blocks - i);
446 }
447
448 ext4_inode_set_size(inode_ref->inode, new_size);
449
450 inode_ref->dirty = true;
451
452 return EOK;
453}
454
455int ext4_filesystem_get_inode_data_block_index(ext4_filesystem_t *fs, ext4_inode_t* inode,
456 aoff64_t iblock, uint32_t* fblock)
457{
458 int rc;
459 uint32_t offset_in_block;
460 uint32_t current_block;
461 aoff64_t block_offset_in_level;
462 int i;
463 int level;
464 block_t *block;
465
466 /* Handle inode using extents */
467 if (ext4_superblock_has_feature_compatible(fs->superblock, EXT4_FEATURE_INCOMPAT_EXTENTS) &&
468 ext4_inode_has_flag(inode, EXT4_INODE_FLAG_EXTENTS)) {
469 current_block = ext4_inode_get_extent_block(inode, iblock, fs->device);
470 *fblock = current_block;
471 return EOK;
472
473 }
474
475 /* Handle simple case when we are dealing with direct reference */
476 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
477 current_block = ext4_inode_get_direct_block(inode, (uint32_t)iblock);
478 *fblock = current_block;
479 return EOK;
480 }
481
482 /* Determine the indirection level needed to get the desired block */
483 level = -1;
484 for (i = 1; i < 4; i++) {
485 if (iblock < fs->inode_block_limits[i]) {
486 level = i;
487 break;
488 }
489 }
490
491 if (level == -1) {
492 return EIO;
493 }
494
495 /* Compute offsets for the topmost level */
496 block_offset_in_level = iblock - fs->inode_block_limits[level-1];
497 current_block = ext4_inode_get_indirect_block(inode, level-1);
498 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
499
500 if (current_block == 0) {
501 *fblock = 0;
502 return EOK;
503 }
504
505 /* Navigate through other levels, until we find the block number
506 * or find null reference meaning we are dealing with sparse file
507 */
508 while (level > 0) {
509 rc = block_get(&block, fs->device, current_block, 0);
510 if (rc != EOK) {
511 return rc;
512 }
513
514 current_block = uint32_t_le2host(((uint32_t*)block->data)[offset_in_block]);
515
516 rc = block_put(block);
517 if (rc != EOK) {
518 return rc;
519 }
520
521 if (current_block == 0) {
522 /* This is a sparse file */
523 *fblock = 0;
524 return EOK;
525 }
526
527 level -= 1;
528
529 /* If we are on the last level, break here as
530 * there is no next level to visit
531 */
532 if (level == 0) {
533 break;
534 }
535
536 /* Visit the next level */
537 block_offset_in_level %= fs->inode_blocks_per_level[level];
538 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
539 }
540
541 *fblock = current_block;
542
543 return EOK;
544}
545
546
547int ext4_filesystem_set_inode_data_block_index(ext4_filesystem_t *fs,
548 ext4_inode_ref_t *inode_ref, aoff64_t iblock, uint32_t fblock)
549{
550
551 int rc;
552 uint32_t offset_in_block;
553 uint32_t current_block, new_block_addr;
554 uint32_t block_size;
555 aoff64_t block_offset_in_level;
556 int i;
557 int level;
558 block_t *block, *new_block;
559
560 /* Handle inode using extents */
561 if (ext4_superblock_has_feature_compatible(fs->superblock, EXT4_FEATURE_INCOMPAT_EXTENTS) &&
562 ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS)) {
563 // TODO
564 return ENOTSUP;
565 }
566
567 /* Handle simple case when we are dealing with direct reference */
568 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
569 ext4_inode_set_direct_block(inode_ref->inode, (uint32_t)iblock, fblock);
570 inode_ref->dirty = true;
571 return EOK;
572 }
573
574 /* Determine the indirection level needed to get the desired block */
575 level = -1;
576 for (i = 1; i < 4; i++) {
577 if (iblock < fs->inode_block_limits[i]) {
578 level = i;
579 break;
580 }
581 }
582
583 if (level == -1) {
584 return EIO;
585 }
586
587 block_size = ext4_superblock_get_block_size(fs->superblock);
588
589 /* Compute offsets for the topmost level */
590 block_offset_in_level = iblock - fs->inode_block_limits[level-1];
591 current_block = ext4_inode_get_indirect_block(inode_ref->inode, level-1);
592 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
593
594 if (current_block == 0) {
595 rc = ext4_balloc_alloc_block(fs, inode_ref, &new_block_addr);
596 if (rc != EOK) {
597 // TODO error
598 EXT4FS_DBG("error in allocation");
599 }
600// EXT4FS_DBG("AAA: new addr \%u, level = \%u", new_block_addr, level);
601
602 ext4_inode_set_indirect_block(inode_ref->inode, level - 1, new_block_addr);
603
604 inode_ref->dirty = true;
605
606 rc = block_get(&new_block, fs->device, new_block_addr, BLOCK_FLAGS_NOREAD);
607 if (rc != EOK) {
608 EXT4FS_DBG("block load error");
609 // TODO error
610 }
611
612 memset(new_block->data, 0, block_size);
613 new_block->dirty = true;
614
615 rc = block_put(new_block);
616 if (rc != EOK) {
617 EXT4FS_DBG("block put error");
618 }
619
620// EXT4FS_DBG("allocated indirect block for level \%u, during setting iblock \%u", level, (uint32_t)iblock);
621
622 current_block = new_block_addr;
623 }
624
625 /* Navigate through other levels, until we find the block number
626 * or find null reference meaning we are dealing with sparse file
627 */
628 while (level > 0) {
629
630 rc = block_get(&block, fs->device, current_block, 0);
631 if (rc != EOK) {
632 return rc;
633 }
634
635 current_block = uint32_t_le2host(((uint32_t*)block->data)[offset_in_block]);
636
637 if ((level > 1) && (current_block == 0)) {
638 rc = ext4_balloc_alloc_block(fs, inode_ref, &new_block_addr);
639 if (rc != EOK) {
640 // TODO error
641 EXT4FS_DBG("allocation error");
642 }
643// EXT4FS_DBG("BBB: new addr \%u, offset = \%u, level = \%u", new_block_addr, offset_in_block, level);
644
645 rc = block_get(&new_block, fs->device, new_block_addr, BLOCK_FLAGS_NOREAD);
646 if (rc != EOK) {
647 // TODO error
648
649 EXT4FS_DBG("BBB: error block loading");
650
651 }
652 memset(new_block->data, 0, block_size);
653 new_block->dirty = true;
654
655 rc = block_put(new_block);
656 if (rc != EOK) {
657 EXT4FS_DBG("BBB: error indirect block saving");
658 }
659
660 ((uint32_t*)block->data)[offset_in_block] = host2uint32_t_le(new_block_addr);
661 block->dirty = true;
662 current_block = new_block_addr;
663 }
664
665 if (level == 1) {
666 ((uint32_t*)block->data)[offset_in_block] = host2uint32_t_le(fblock);
667 block->dirty = true;
668 }
669
670 rc = block_put(block);
671 if (rc != EOK) {
672 return rc;
673 }
674
675 level -= 1;
676
677 /* If we are on the last level, break here as
678 * there is no next level to visit
679 */
680 if (level == 0) {
681 break;
682 }
683
684 /* Visit the next level */
685 block_offset_in_level %= fs->inode_blocks_per_level[level];
686 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
687 }
688
689 return EOK;
690}
691
692int ext4_filesystem_release_inode_block(ext4_filesystem_t *fs,
693 ext4_inode_ref_t *inode_ref, uint32_t iblock)
694{
695 int rc;
696 uint32_t fblock;
697 int i;
698 int level;
699 aoff64_t block_offset_in_level;
700 uint32_t current_block;
701 uint32_t offset_in_block;
702 block_t *block;
703 ext4_inode_t *inode = inode_ref->inode;
704
705 /* TODO handle extents */
706
707
708 /* Handle simple case when we are dealing with direct reference */
709 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
710 fblock = ext4_inode_get_direct_block(inode, iblock);
711 // Sparse file
712 if (fblock == 0) {
713 return EOK;
714 }
715
716 ext4_inode_set_direct_block(inode, iblock, 0);
717 return ext4_balloc_free_block(fs, inode_ref, fblock);
718 }
719
720
721 /* Determine the indirection level needed to get the desired block */
722 level = -1;
723 for (i = 1; i < 4; i++) {
724 if (iblock < fs->inode_block_limits[i]) {
725 level = i;
726 break;
727 }
728 }
729
730 if (level == -1) {
731 return EIO;
732 }
733
734 /* Compute offsets for the topmost level */
735 block_offset_in_level = iblock - fs->inode_block_limits[level-1];
736 current_block = ext4_inode_get_indirect_block(inode, level-1);
737 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
738
739 /* Navigate through other levels, until we find the block number
740 * or find null reference meaning we are dealing with sparse file
741 */
742 while (level > 0) {
743 rc = block_get(&block, fs->device, current_block, 0);
744 if (rc != EOK) {
745 return rc;
746 }
747
748 current_block = uint32_t_le2host(((uint32_t*)block->data)[offset_in_block]);
749
750 // Set zero
751 if (level == 1) {
752 ((uint32_t*)block->data)[offset_in_block] = host2uint32_t_le(0);
753 block->dirty = true;
754 }
755
756 rc = block_put(block);
757 if (rc != EOK) {
758 return rc;
759 }
760
761 level -= 1;
762
763 /* If we are on the last level, break here as
764 * there is no next level to visit
765 */
766 if (level == 0) {
767 break;
768 }
769
770 /* Visit the next level */
771 block_offset_in_level %= fs->inode_blocks_per_level[level];
772 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
773 }
774
775 fblock = current_block;
776
777 if (fblock == 0) {
778 return EOK;
779 }
780
781 return ext4_balloc_free_block(fs, inode_ref, fblock);
782
783}
784
785/**
786 * @}
787 */
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