source: mainline/uspace/lib/ext4/libext4_filesystem.c@ 5b0a3946

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 5b0a3946 was 5b0a3946, checked in by Frantisek Princ <frantisek.princ@…>, 14 years ago

developement version of releasing more complex extent tree with nontrivial depth (> 0)
  • Property mode set to 100644
File size: 22.7 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 More complex filesystem operations.
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
47 fs->device = service_id;
48
49 rc = block_init(EXCHANGE_SERIALIZE, fs->device, 4096);
50 if (rc != EOK) {
51 return rc;
52 }
53
54 /* Read superblock from device */
55 ext4_superblock_t *temp_superblock;
56 rc = ext4_superblock_read_direct(fs->device, &temp_superblock);
57 if (rc != EOK) {
58 block_fini(fs->device);
59 return rc;
60 }
61
62 /* Read block size from superblock and check */
63 uint32_t block_size = ext4_superblock_get_block_size(temp_superblock);
64 if (block_size > EXT4_MAX_BLOCK_SIZE) {
65 block_fini(fs->device);
66 return ENOTSUP;
67 }
68
69 /* Initialize block caching */
70 rc = block_cache_init(service_id, block_size, 0, CACHE_MODE_WT);
71 if (rc != EOK) {
72 block_fini(fs->device);
73 return rc;
74 }
75
76 uint32_t block_ids_per_block = block_size / sizeof(uint32_t);
77 fs->inode_block_limits[0] = EXT4_INODE_DIRECT_BLOCK_COUNT;
78 fs->inode_blocks_per_level[0] = 1;
79 for (int i = 1; i < 4; i++) {
80 fs->inode_blocks_per_level[i] = fs->inode_blocks_per_level[i-1] *
81 block_ids_per_block;
82 fs->inode_block_limits[i] = fs->inode_block_limits[i-1] +
83 fs->inode_blocks_per_level[i];
84 }
85
86 /* Return loaded superblock */
87 fs->superblock = temp_superblock;
88
89 return EOK;
90}
91
92int ext4_filesystem_fini(ext4_filesystem_t *fs, bool write_sb)
93{
94 int rc = EOK;
95
96 if (write_sb) {
97 rc = ext4_superblock_write_direct(fs->device, fs->superblock);
98 }
99
100 free(fs->superblock);
101 block_fini(fs->device);
102
103 return rc;
104}
105
106int ext4_filesystem_check_sanity(ext4_filesystem_t *fs)
107{
108 int rc;
109
110 rc = ext4_superblock_check_sanity(fs->superblock);
111 if (rc != EOK) {
112 return rc;
113 }
114
115 return EOK;
116}
117
118int ext4_filesystem_check_features(ext4_filesystem_t *fs, bool *o_read_only)
119{
120 /* Feature flags are present in rev 1 and later */
121 if (ext4_superblock_get_rev_level(fs->superblock) == 0) {
122 *o_read_only = false;
123 return EOK;
124 }
125
126 uint32_t incompatible_features;
127 incompatible_features = ext4_superblock_get_features_incompatible(fs->superblock);
128 incompatible_features &= ~EXT4_FEATURE_INCOMPAT_SUPP;
129 if (incompatible_features > 0) {
130 *o_read_only = true;
131 return ENOTSUP;
132 }
133
134 uint32_t compatible_read_only;
135 compatible_read_only = ext4_superblock_get_features_read_only(fs->superblock);
136 compatible_read_only &= ~EXT4_FEATURE_RO_COMPAT_SUPP;
137 if (compatible_read_only > 0) {
138 *o_read_only = true;
139 }
140
141 return EOK;
142}
143
144int ext4_filesystem_get_block_group_ref(ext4_filesystem_t *fs, uint32_t bgid,
145 ext4_block_group_ref_t **ref)
146{
147 int rc;
148
149 ext4_block_group_ref_t *newref = malloc(sizeof(ext4_block_group_ref_t));
150 if (newref == NULL) {
151 return ENOMEM;
152 }
153
154 uint32_t descriptors_per_block = ext4_superblock_get_block_size(fs->superblock)
155 / ext4_superblock_get_desc_size(fs->superblock);
156
157 /* Block group descriptor table starts at the next block after superblock */
158 aoff64_t block_id = ext4_superblock_get_first_data_block(fs->superblock) + 1;
159
160 /* Find the block containing the descriptor we are looking for */
161 block_id += bgid / descriptors_per_block;
162 uint32_t offset = (bgid % descriptors_per_block) * ext4_superblock_get_desc_size(fs->superblock);
163
164 rc = block_get(&newref->block, fs->device, block_id, 0);
165 if (rc != EOK) {
166 free(newref);
167 return rc;
168 }
169
170 newref->block_group = newref->block->data + offset;
171 newref->fs = fs;
172 newref->index = bgid;
173 newref->dirty = false;
174
175 *ref = newref;
176
177 return EOK;
178}
179
180static uint16_t ext4_filesystem_bg_checksum(ext4_superblock_t *sb, uint32_t bgid,
181 ext4_block_group_t *bg)
182{
183 uint16_t crc = 0;
184
185 if (ext4_superblock_has_feature_read_only(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
186
187 void *base = bg;
188 void *checksum = &bg->checksum;
189
190 uint32_t offset = (uint32_t)(checksum - base);
191
192 uint32_t le_group = host2uint32_t_le(bgid);
193
194 crc = crc16(~0, sb->uuid, sizeof(sb->uuid));
195 crc = crc16(crc, (uint8_t *)&le_group, sizeof(le_group));
196 crc = crc16(crc, (uint8_t *)bg, offset);
197
198 offset += sizeof(bg->checksum); /* skip checksum */
199
200 /* for checksum of struct ext4_group_desc do the rest...*/
201 if ((ext4_superblock_has_feature_incompatible(sb, EXT4_FEATURE_INCOMPAT_64BIT)) &&
202 offset < ext4_superblock_get_desc_size(sb)) {
203
204 crc = crc16(crc, ((uint8_t *)bg) + offset, ext4_superblock_get_desc_size(sb) - offset);
205 }
206 }
207
208 return crc;
209
210}
211
212
213int ext4_filesystem_put_block_group_ref(ext4_block_group_ref_t *ref)
214{
215 int rc;
216
217 if (ref->dirty) {
218 uint16_t checksum = ext4_filesystem_bg_checksum(
219 ref->fs->superblock, ref->index, ref->block_group);
220
221 ext4_block_group_set_checksum(ref->block_group, checksum);
222
223 ref->block->dirty = true;
224 }
225
226 rc = block_put(ref->block);
227 free(ref);
228
229 return rc;
230}
231
232int ext4_filesystem_get_inode_ref(ext4_filesystem_t *fs, uint32_t index,
233 ext4_inode_ref_t **ref)
234{
235 int rc;
236
237 ext4_inode_ref_t *newref = malloc(sizeof(ext4_inode_ref_t));
238 if (newref == NULL) {
239 return ENOMEM;
240 }
241
242 uint32_t inodes_per_group =
243 ext4_superblock_get_inodes_per_group(fs->superblock);
244
245 /* inode numbers are 1-based, but it is simpler to work with 0-based
246 * when computing indices
247 */
248 index -= 1;
249 uint32_t block_group = index / inodes_per_group;
250 uint32_t offset_in_group = index % inodes_per_group;
251
252 ext4_block_group_ref_t *bg_ref;
253 rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
254 if (rc != EOK) {
255 free(newref);
256 return rc;
257 }
258
259 uint32_t inode_table_start = ext4_block_group_get_inode_table_first_block(
260 bg_ref->block_group, fs->superblock);
261
262 rc = ext4_filesystem_put_block_group_ref(bg_ref);
263 if (rc != EOK) {
264 free(newref);
265 return rc;
266 }
267
268 uint16_t inode_size = ext4_superblock_get_inode_size(fs->superblock);
269 uint32_t block_size = ext4_superblock_get_block_size(fs->superblock);
270 uint32_t byte_offset_in_group = offset_in_group * inode_size;
271
272 aoff64_t block_id = inode_table_start + (byte_offset_in_group / block_size);
273 rc = block_get(&newref->block, fs->device, block_id, 0);
274 if (rc != EOK) {
275 free(newref);
276 return rc;
277 }
278
279 uint32_t offset_in_block = byte_offset_in_group % block_size;
280 newref->inode = newref->block->data + offset_in_block;
281 /* we decremented index above, but need to store the original value
282 * in the reference
283 */
284 newref->index = index + 1;
285 newref->fs = fs;
286 newref->dirty = false;
287
288 *ref = newref;
289
290 return EOK;
291}
292
293
294int ext4_filesystem_put_inode_ref(ext4_inode_ref_t *ref)
295{
296 int rc;
297
298 if (ref->dirty) {
299 ref->block->dirty = true;
300 }
301
302 rc = block_put(ref->block);
303 free(ref);
304
305 return rc;
306}
307
308int ext4_filesystem_alloc_inode(ext4_filesystem_t *fs,
309 ext4_inode_ref_t **inode_ref, int flags)
310{
311 int rc;
312
313 bool is_dir = false;
314 if (flags & L_DIRECTORY) {
315 is_dir = true;
316 }
317
318 // allocate inode
319 uint32_t index;
320 rc = ext4_ialloc_alloc_inode(fs, &index, is_dir);
321 if (rc != EOK) {
322 return rc;
323 }
324
325 // TODO extents, dir_index etc...
326
327 rc = ext4_filesystem_get_inode_ref(fs, index, inode_ref);
328 if (rc != EOK) {
329 ext4_ialloc_free_inode(fs, index, is_dir);
330 return rc;
331 }
332
333 // init inode
334 ext4_inode_t *inode = (*inode_ref)->inode;
335
336 if (is_dir) {
337 ext4_inode_set_mode(fs->superblock, inode, EXT4_INODE_MODE_DIRECTORY);
338 ext4_inode_set_links_count(inode, 1); // '.' entry
339 } else {
340 ext4_inode_set_mode(fs->superblock, inode, EXT4_INODE_MODE_FILE);
341 ext4_inode_set_links_count(inode, 0);
342 }
343
344 ext4_inode_set_uid(inode, 0);
345 ext4_inode_set_gid(inode, 0);
346 ext4_inode_set_size(inode, 0);
347 ext4_inode_set_access_time(inode, 0);
348 ext4_inode_set_change_inode_time(inode, 0);
349 ext4_inode_set_modification_time(inode, 0);
350 ext4_inode_set_deletion_time(inode, 0);
351 ext4_inode_set_blocks_count(fs->superblock, inode, 0);
352 ext4_inode_set_flags(inode, 0);
353 ext4_inode_set_generation(inode, 0);
354
355 for (uint32_t i = 0; i < EXT4_INODE_BLOCKS; i++) {
356 inode->blocks[i] = 0;
357 }
358
359 (*inode_ref)->dirty = true;
360
361 return EOK;
362}
363
364int ext4_filesystem_free_inode(ext4_inode_ref_t *inode_ref)
365{
366 int rc;
367
368 // release all indirect (no data) blocks
369
370 // 1) Single indirect
371 uint32_t fblock = ext4_inode_get_indirect_block(inode_ref->inode, 0);
372 if (fblock != 0) {
373 rc = ext4_balloc_free_block(inode_ref, fblock);
374 if (rc != EOK) {
375 return rc;
376 }
377
378 ext4_inode_set_indirect_block(inode_ref->inode, 0, 0);
379 }
380
381 ext4_filesystem_t *fs = inode_ref->fs;
382
383 block_t *block;
384 uint32_t block_size = ext4_superblock_get_block_size(fs->superblock);
385 uint32_t count = block_size / sizeof(uint32_t);
386
387 // 2) Double indirect
388 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 1);
389 if (fblock != 0) {
390 rc = block_get(&block, fs->device, fblock, BLOCK_FLAGS_NONE);
391 if (rc != EOK) {
392 return rc;
393 }
394
395 uint32_t ind_block;
396 for (uint32_t offset = 0; offset < count; ++offset) {
397 ind_block = uint32_t_le2host(((uint32_t*)block->data)[offset]);
398
399 if (ind_block != 0) {
400 rc = ext4_balloc_free_block(inode_ref, ind_block);
401 if (rc != EOK) {
402 block_put(block);
403 return rc;
404 }
405 }
406 }
407
408 block_put(block);
409 rc = ext4_balloc_free_block(inode_ref, fblock);
410 if (rc != EOK) {
411 return rc;
412 }
413
414 ext4_inode_set_indirect_block(inode_ref->inode, 1, 0);
415 }
416
417
418 // 3) Tripple indirect
419 block_t *subblock;
420 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 2);
421 if (fblock != 0) {
422 rc = block_get(&block, fs->device, fblock, BLOCK_FLAGS_NONE);
423 if (rc != EOK) {
424 return rc;
425 }
426
427 uint32_t ind_block;
428 for (uint32_t offset = 0; offset < count; ++offset) {
429 ind_block = uint32_t_le2host(((uint32_t*)block->data)[offset]);
430
431 if (ind_block != 0) {
432 rc = block_get(&subblock, fs->device, ind_block, BLOCK_FLAGS_NONE);
433 if (rc != EOK) {
434 block_put(block);
435 return rc;
436 }
437
438 uint32_t ind_subblock;
439 for (uint32_t suboffset = 0; suboffset < count; ++suboffset) {
440 ind_subblock = uint32_t_le2host(((uint32_t*)subblock->data)[suboffset]);
441
442 if (ind_subblock != 0) {
443 rc = ext4_balloc_free_block(inode_ref, ind_subblock);
444 if (rc != EOK) {
445 block_put(subblock);
446 block_put(block);
447 return rc;
448 }
449 }
450
451 }
452 block_put(subblock);
453
454 }
455
456 rc = ext4_balloc_free_block(inode_ref, ind_block);
457 if (rc != EOK) {
458 block_put(block);
459 return rc;
460 }
461
462
463 }
464
465 block_put(block);
466 rc = ext4_balloc_free_block(inode_ref, fblock);
467 if (rc != EOK) {
468 return rc;
469 }
470
471 ext4_inode_set_indirect_block(inode_ref->inode, 2, 0);
472 }
473
474 inode_ref->dirty = true;
475
476 // Free inode
477 if (ext4_inode_is_type(fs->superblock, inode_ref->inode,
478 EXT4_INODE_MODE_DIRECTORY)) {
479 rc = ext4_ialloc_free_inode(fs, inode_ref->index, true);
480 } else {
481 rc = ext4_ialloc_free_inode(fs, inode_ref->index, false);
482 }
483 if (rc != EOK) {
484 return rc;
485 }
486
487 return EOK;
488}
489
490int ext4_filesystem_truncate_inode(
491 ext4_inode_ref_t *inode_ref, aoff64_t new_size)
492{
493 int rc;
494
495 ext4_superblock_t *sb = inode_ref->fs->superblock;
496
497 if (! ext4_inode_can_truncate(sb, inode_ref->inode)) {
498 // Unable to truncate
499 return EINVAL;
500 }
501
502 aoff64_t old_size = ext4_inode_get_size(sb, inode_ref->inode);
503 if (old_size == new_size) {
504 // Nothing to do
505 return EOK;
506 }
507
508 // It's not suppported to make the larger file
509 if (old_size < new_size) {
510 return EINVAL;
511 }
512
513 aoff64_t size_diff = old_size - new_size;
514 uint32_t block_size = ext4_superblock_get_block_size(sb);
515 uint32_t diff_blocks_count = size_diff / block_size;
516 if (size_diff % block_size != 0) {
517 diff_blocks_count++;
518 }
519
520 uint32_t old_blocks_count = old_size / block_size;
521 if (old_size % block_size != 0) {
522 old_blocks_count++;
523 }
524
525 if (ext4_superblock_has_feature_incompatible(
526 inode_ref->fs->superblock, EXT4_FEATURE_INCOMPAT_EXTENTS) &&
527 ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS)) {
528
529 rc = ext4_extent_release_blocks_from(inode_ref, old_blocks_count - diff_blocks_count);
530 if (rc != EOK) {
531 return rc;
532 }
533 } else {
534 // starting from 1 because of logical blocks are numbered from 0
535 for (uint32_t i = 1; i <= diff_blocks_count; ++i) {
536 rc = ext4_filesystem_release_inode_block(inode_ref, old_blocks_count - i);
537 if (rc != EOK) {
538 return rc;
539 }
540 }
541 }
542
543 ext4_inode_set_size(inode_ref->inode, new_size);
544
545 inode_ref->dirty = true;
546
547 return EOK;
548}
549
550int ext4_filesystem_get_inode_data_block_index(ext4_inode_ref_t *inode_ref,
551 aoff64_t iblock, uint32_t* fblock)
552{
553 int rc;
554
555 ext4_filesystem_t *fs = inode_ref->fs;
556
557 uint32_t current_block;
558
559 /* Handle inode using extents */
560 if (ext4_superblock_has_feature_incompatible(fs->superblock, EXT4_FEATURE_INCOMPAT_EXTENTS) &&
561 ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS)) {
562 rc = ext4_extent_find_block(inode_ref, iblock, &current_block);
563
564 if (rc != EOK) {
565 return rc;
566 }
567
568 *fblock = current_block;
569 return EOK;
570
571 }
572
573 ext4_inode_t *inode = inode_ref->inode;
574
575 /* Handle simple case when we are dealing with direct reference */
576 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
577 current_block = ext4_inode_get_direct_block(inode, (uint32_t)iblock);
578 *fblock = current_block;
579 return EOK;
580 }
581
582 /* Determine the indirection level needed to get the desired block */
583 int level = -1;
584 for (int i = 1; i < 4; i++) {
585 if (iblock < fs->inode_block_limits[i]) {
586 level = i;
587 break;
588 }
589 }
590
591 if (level == -1) {
592 return EIO;
593 }
594
595 /* Compute offsets for the topmost level */
596 aoff64_t block_offset_in_level = iblock - fs->inode_block_limits[level-1];
597 current_block = ext4_inode_get_indirect_block(inode, level-1);
598 uint32_t offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
599
600 if (current_block == 0) {
601 *fblock = 0;
602 return EOK;
603 }
604
605 block_t *block;
606
607 /* Navigate through other levels, until we find the block number
608 * or find null reference meaning we are dealing with sparse file
609 */
610 while (level > 0) {
611 rc = block_get(&block, fs->device, current_block, 0);
612 if (rc != EOK) {
613 return rc;
614 }
615
616 current_block = uint32_t_le2host(((uint32_t*)block->data)[offset_in_block]);
617
618 rc = block_put(block);
619 if (rc != EOK) {
620 return rc;
621 }
622
623 if (current_block == 0) {
624 /* This is a sparse file */
625 *fblock = 0;
626 return EOK;
627 }
628
629 level -= 1;
630
631 /* If we are on the last level, break here as
632 * there is no next level to visit
633 */
634 if (level == 0) {
635 break;
636 }
637
638 /* Visit the next level */
639 block_offset_in_level %= fs->inode_blocks_per_level[level];
640 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
641 }
642
643 *fblock = current_block;
644
645 return EOK;
646}
647
648
649int ext4_filesystem_set_inode_data_block_index(ext4_inode_ref_t *inode_ref,
650 aoff64_t iblock, uint32_t fblock)
651{
652 int rc;
653
654 ext4_filesystem_t *fs = inode_ref->fs;
655
656 /* Handle inode using extents */
657 if (ext4_superblock_has_feature_compatible(fs->superblock, EXT4_FEATURE_INCOMPAT_EXTENTS) &&
658 ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS)) {
659 // TODO
660 return ENOTSUP;
661 }
662
663 /* Handle simple case when we are dealing with direct reference */
664 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
665 ext4_inode_set_direct_block(inode_ref->inode, (uint32_t)iblock, fblock);
666 inode_ref->dirty = true;
667 return EOK;
668 }
669
670 /* Determine the indirection level needed to get the desired block */
671 int level = -1;
672 for (int i = 1; i < 4; i++) {
673 if (iblock < fs->inode_block_limits[i]) {
674 level = i;
675 break;
676 }
677 }
678
679 if (level == -1) {
680 return EIO;
681 }
682
683 uint32_t block_size = ext4_superblock_get_block_size(fs->superblock);
684
685 /* Compute offsets for the topmost level */
686 aoff64_t block_offset_in_level = iblock - fs->inode_block_limits[level-1];
687 uint32_t current_block = ext4_inode_get_indirect_block(inode_ref->inode, level-1);
688 uint32_t offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
689
690 uint32_t new_block_addr;
691 block_t *block, *new_block;
692
693 if (current_block == 0) {
694 rc = ext4_balloc_alloc_block(inode_ref, &new_block_addr);
695 if (rc != EOK) {
696 return rc;
697 }
698
699 ext4_inode_set_indirect_block(inode_ref->inode, level - 1, new_block_addr);
700
701 inode_ref->dirty = true;
702
703 rc = block_get(&new_block, fs->device, new_block_addr, BLOCK_FLAGS_NOREAD);
704 if (rc != EOK) {
705 ext4_balloc_free_block(inode_ref, new_block_addr);
706 return rc;
707 }
708
709 memset(new_block->data, 0, block_size);
710 new_block->dirty = true;
711
712 rc = block_put(new_block);
713 if (rc != EOK) {
714 return rc;
715 }
716
717 current_block = new_block_addr;
718 }
719
720 /* Navigate through other levels, until we find the block number
721 * or find null reference meaning we are dealing with sparse file
722 */
723 while (level > 0) {
724
725 rc = block_get(&block, fs->device, current_block, 0);
726 if (rc != EOK) {
727 return rc;
728 }
729
730 current_block = uint32_t_le2host(((uint32_t*)block->data)[offset_in_block]);
731
732 if ((level > 1) && (current_block == 0)) {
733 rc = ext4_balloc_alloc_block(inode_ref, &new_block_addr);
734 if (rc != EOK) {
735 block_put(block);
736 return rc;
737 }
738
739 rc = block_get(&new_block, fs->device, new_block_addr, BLOCK_FLAGS_NOREAD);
740 if (rc != EOK) {
741 block_put(block);
742 return rc;
743 }
744
745 memset(new_block->data, 0, block_size);
746 new_block->dirty = true;
747
748 rc = block_put(new_block);
749 if (rc != EOK) {
750 block_put(block);
751 return rc;
752 }
753
754 ((uint32_t*)block->data)[offset_in_block] = host2uint32_t_le(new_block_addr);
755 block->dirty = true;
756 current_block = new_block_addr;
757 }
758
759 if (level == 1) {
760 ((uint32_t*)block->data)[offset_in_block] = host2uint32_t_le(fblock);
761 block->dirty = true;
762 }
763
764 rc = block_put(block);
765 if (rc != EOK) {
766 return rc;
767 }
768
769 level -= 1;
770
771 /* If we are on the last level, break here as
772 * there is no next level to visit
773 */
774 if (level == 0) {
775 break;
776 }
777
778 /* Visit the next level */
779 block_offset_in_level %= fs->inode_blocks_per_level[level];
780 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
781 }
782
783 return EOK;
784}
785
786int ext4_filesystem_release_inode_block(
787 ext4_inode_ref_t *inode_ref, uint32_t iblock)
788{
789 int rc;
790
791 uint32_t fblock;
792
793 ext4_filesystem_t *fs = inode_ref->fs;
794
795 // EXTENTS are handled
796 assert(! (ext4_superblock_has_feature_incompatible(fs->superblock,
797 EXT4_FEATURE_INCOMPAT_EXTENTS) &&
798 ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS)));
799
800 ext4_inode_t *inode = inode_ref->inode;
801
802 /* Handle simple case when we are dealing with direct reference */
803 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
804 fblock = ext4_inode_get_direct_block(inode, iblock);
805 // Sparse file
806 if (fblock == 0) {
807 return EOK;
808 }
809
810 ext4_inode_set_direct_block(inode, iblock, 0);
811 return ext4_balloc_free_block(inode_ref, fblock);
812 }
813
814
815 /* Determine the indirection level needed to get the desired block */
816 int level = -1;
817 for (int i = 1; i < 4; i++) {
818 if (iblock < fs->inode_block_limits[i]) {
819 level = i;
820 break;
821 }
822 }
823
824 if (level == -1) {
825 return EIO;
826 }
827
828 /* Compute offsets for the topmost level */
829 aoff64_t block_offset_in_level = iblock - fs->inode_block_limits[level-1];
830 uint32_t current_block = ext4_inode_get_indirect_block(inode, level-1);
831 uint32_t offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
832
833 /* Navigate through other levels, until we find the block number
834 * or find null reference meaning we are dealing with sparse file
835 */
836 block_t *block;
837 while (level > 0) {
838 rc = block_get(&block, fs->device, current_block, 0);
839 if (rc != EOK) {
840 return rc;
841 }
842
843 current_block = uint32_t_le2host(((uint32_t*)block->data)[offset_in_block]);
844
845 // Set zero
846 if (level == 1) {
847 ((uint32_t*)block->data)[offset_in_block] = host2uint32_t_le(0);
848 block->dirty = true;
849 }
850
851 rc = block_put(block);
852 if (rc != EOK) {
853 return rc;
854 }
855
856 level -= 1;
857
858 /* If we are on the last level, break here as
859 * there is no next level to visit
860 */
861 if (level == 0) {
862 break;
863 }
864
865 /* Visit the next level */
866 block_offset_in_level %= fs->inode_blocks_per_level[level];
867 offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
868 }
869
870 fblock = current_block;
871
872 if (fblock == 0) {
873 return EOK;
874 }
875
876 return ext4_balloc_free_block(inode_ref, fblock);
877
878}
879
880int ext4_filesystem_add_orphan(ext4_inode_ref_t *inode_ref)
881{
882 uint32_t next_orphan = ext4_superblock_get_last_orphan(
883 inode_ref->fs->superblock);
884 ext4_inode_set_deletion_time(inode_ref->inode, next_orphan);
885 ext4_superblock_set_last_orphan(
886 inode_ref->fs->superblock, inode_ref->index);
887 inode_ref->dirty = true;
888
889 return EOK;
890}
891
892int ext4_filesystem_delete_orphan(ext4_inode_ref_t *inode_ref)
893{
894 int rc;
895
896 uint32_t last_orphan = ext4_superblock_get_last_orphan(
897 inode_ref->fs->superblock);
898 assert(last_orphan > 0);
899
900 uint32_t next_orphan = ext4_inode_get_deletion_time(inode_ref->inode);
901
902 if (last_orphan == inode_ref->index) {
903 ext4_superblock_set_last_orphan(inode_ref->fs->superblock, next_orphan);
904 ext4_inode_set_deletion_time(inode_ref->inode, 0);
905 inode_ref->dirty = true;
906 return EOK;
907 }
908
909 ext4_inode_ref_t *current;
910 rc = ext4_filesystem_get_inode_ref(inode_ref->fs, last_orphan, &current);
911 if (rc != EOK) {
912 return rc;
913 }
914 next_orphan = ext4_inode_get_deletion_time(current->inode);
915
916 bool found;
917
918 while (next_orphan != 0) {
919 if (next_orphan == inode_ref->index) {
920 next_orphan = ext4_inode_get_deletion_time(inode_ref->inode);
921 ext4_inode_set_deletion_time(current->inode, next_orphan);
922 current->dirty = true;
923 found = true;
924 break;
925 }
926
927 ext4_filesystem_put_inode_ref(current);
928
929 rc = ext4_filesystem_get_inode_ref(inode_ref->fs, next_orphan, &current);
930 if (rc != EOK) {
931 return rc;
932 }
933 next_orphan = ext4_inode_get_deletion_time(current->inode);
934
935 }
936
937 ext4_inode_set_deletion_time(inode_ref->inode, 0);
938
939 rc = ext4_filesystem_put_inode_ref(current);
940 if (rc != EOK) {
941 return rc;
942 }
943
944 if (!found) {
945 return ENOENT;
946 }
947
948 return EOK;
949}
950
951/**
952 * @}
953 */
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