2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
6 * Copyright (c) 2012 Martin Sucha
7 * Copyright (c) 2012 Frantisek Princ
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
33 /** @addtogroup lwext4
38 * @brief More complex filesystem functions.
41 #include "ext4_config.h"
42 #include "ext4_types.h"
43 #include "ext4_misc.h"
44 #include "ext4_errno.h"
45 #include "ext4_debug.h"
47 #include "ext4_trans.h"
49 #include "ext4_blockdev.h"
50 #include "ext4_super.h"
51 #include "ext4_crc32.h"
52 #include "ext4_block_group.h"
53 #include "ext4_balloc.h"
54 #include "ext4_bitmap.h"
55 #include "ext4_inode.h"
56 #include "ext4_ialloc.h"
57 #include "ext4_extent.h"
61 int ext4_fs_init(struct ext4_fs *fs, struct ext4_blockdev *bdev,
68 ext4_assert(fs && bdev);
72 fs->read_only = read_only;
74 r = ext4_sb_read(fs->bdev, &fs->sb);
78 if (!ext4_sb_check(&fs->sb))
81 bsize = ext4_sb_get_block_size(&fs->sb);
82 if (bsize > EXT4_MAX_BLOCK_SIZE)
85 r = ext4_fs_check_features(fs, &read_only);
90 fs->read_only = read_only;
92 /* Compute limits for indirect block levels */
93 uint32_t blocks_id = bsize / sizeof(uint32_t);
95 fs->inode_block_limits[0] = EXT4_INODE_DIRECT_BLOCK_COUNT;
96 fs->inode_blocks_per_level[0] = 1;
98 for (i = 1; i < 4; i++) {
99 fs->inode_blocks_per_level[i] =
100 fs->inode_blocks_per_level[i - 1] * blocks_id;
101 fs->inode_block_limits[i] = fs->inode_block_limits[i - 1] +
102 fs->inode_blocks_per_level[i];
106 tmp = ext4_get16(&fs->sb, state);
107 if (tmp & EXT4_SUPERBLOCK_STATE_ERROR_FS)
108 ext4_dbg(DEBUG_FS, DBG_WARN
109 "last umount error: superblock fs_error flag\n");
112 if (!fs->read_only) {
113 /* Mark system as mounted */
114 ext4_set16(&fs->sb, state, EXT4_SUPERBLOCK_STATE_ERROR_FS);
115 r = ext4_sb_write(fs->bdev, &fs->sb);
119 /*Update mount count*/
120 ext4_set16(&fs->sb, mount_count, ext4_get16(&fs->sb, mount_count) + 1);
126 int ext4_fs_fini(struct ext4_fs *fs)
130 /*Set superblock state*/
131 ext4_set16(&fs->sb, state, EXT4_SUPERBLOCK_STATE_VALID_FS);
134 return ext4_sb_write(fs->bdev, &fs->sb);
139 static void ext4_fs_debug_features_inc(uint32_t features_incompatible)
141 if (features_incompatible & EXT4_FINCOM_COMPRESSION)
142 ext4_dbg(DEBUG_FS, DBG_NONE "compression\n");
143 if (features_incompatible & EXT4_FINCOM_FILETYPE)
144 ext4_dbg(DEBUG_FS, DBG_NONE "filetype\n");
145 if (features_incompatible & EXT4_FINCOM_RECOVER)
146 ext4_dbg(DEBUG_FS, DBG_NONE "recover\n");
147 if (features_incompatible & EXT4_FINCOM_JOURNAL_DEV)
148 ext4_dbg(DEBUG_FS, DBG_NONE "journal_dev\n");
149 if (features_incompatible & EXT4_FINCOM_META_BG)
150 ext4_dbg(DEBUG_FS, DBG_NONE "meta_bg\n");
151 if (features_incompatible & EXT4_FINCOM_EXTENTS)
152 ext4_dbg(DEBUG_FS, DBG_NONE "extents\n");
153 if (features_incompatible & EXT4_FINCOM_64BIT)
154 ext4_dbg(DEBUG_FS, DBG_NONE "64bit\n");
155 if (features_incompatible & EXT4_FINCOM_MMP)
156 ext4_dbg(DEBUG_FS, DBG_NONE "mnp\n");
157 if (features_incompatible & EXT4_FINCOM_FLEX_BG)
158 ext4_dbg(DEBUG_FS, DBG_NONE "flex_bg\n");
159 if (features_incompatible & EXT4_FINCOM_EA_INODE)
160 ext4_dbg(DEBUG_FS, DBG_NONE "ea_inode\n");
161 if (features_incompatible & EXT4_FINCOM_DIRDATA)
162 ext4_dbg(DEBUG_FS, DBG_NONE "dirdata\n");
163 if (features_incompatible & EXT4_FINCOM_BG_USE_META_CSUM)
164 ext4_dbg(DEBUG_FS, DBG_NONE "meta_csum\n");
165 if (features_incompatible & EXT4_FINCOM_LARGEDIR)
166 ext4_dbg(DEBUG_FS, DBG_NONE "largedir\n");
167 if (features_incompatible & EXT4_FINCOM_INLINE_DATA)
168 ext4_dbg(DEBUG_FS, DBG_NONE "inline_data\n");
170 static void ext4_fs_debug_features_comp(uint32_t features_compatible)
172 if (features_compatible & EXT4_FCOM_DIR_PREALLOC)
173 ext4_dbg(DEBUG_FS, DBG_NONE "dir_prealloc\n");
174 if (features_compatible & EXT4_FCOM_IMAGIC_INODES)
175 ext4_dbg(DEBUG_FS, DBG_NONE "imagic_inodes\n");
176 if (features_compatible & EXT4_FCOM_HAS_JOURNAL)
177 ext4_dbg(DEBUG_FS, DBG_NONE "has_journal\n");
178 if (features_compatible & EXT4_FCOM_EXT_ATTR)
179 ext4_dbg(DEBUG_FS, DBG_NONE "ext_attr\n");
180 if (features_compatible & EXT4_FCOM_RESIZE_INODE)
181 ext4_dbg(DEBUG_FS, DBG_NONE "resize_inode\n");
182 if (features_compatible & EXT4_FCOM_DIR_INDEX)
183 ext4_dbg(DEBUG_FS, DBG_NONE "dir_index\n");
186 static void ext4_fs_debug_features_ro(uint32_t features_ro)
188 if (features_ro & EXT4_FRO_COM_SPARSE_SUPER)
189 ext4_dbg(DEBUG_FS, DBG_NONE "sparse_super\n");
190 if (features_ro & EXT4_FRO_COM_LARGE_FILE)
191 ext4_dbg(DEBUG_FS, DBG_NONE "large_file\n");
192 if (features_ro & EXT4_FRO_COM_BTREE_DIR)
193 ext4_dbg(DEBUG_FS, DBG_NONE "btree_dir\n");
194 if (features_ro & EXT4_FRO_COM_HUGE_FILE)
195 ext4_dbg(DEBUG_FS, DBG_NONE "huge_file\n");
196 if (features_ro & EXT4_FRO_COM_GDT_CSUM)
197 ext4_dbg(DEBUG_FS, DBG_NONE "gtd_csum\n");
198 if (features_ro & EXT4_FRO_COM_DIR_NLINK)
199 ext4_dbg(DEBUG_FS, DBG_NONE "dir_nlink\n");
200 if (features_ro & EXT4_FRO_COM_EXTRA_ISIZE)
201 ext4_dbg(DEBUG_FS, DBG_NONE "extra_isize\n");
202 if (features_ro & EXT4_FRO_COM_QUOTA)
203 ext4_dbg(DEBUG_FS, DBG_NONE "quota\n");
204 if (features_ro & EXT4_FRO_COM_BIGALLOC)
205 ext4_dbg(DEBUG_FS, DBG_NONE "bigalloc\n");
206 if (features_ro & EXT4_FRO_COM_METADATA_CSUM)
207 ext4_dbg(DEBUG_FS, DBG_NONE "metadata_csum\n");
210 int ext4_fs_check_features(struct ext4_fs *fs, bool *read_only)
212 ext4_assert(fs && read_only);
214 if (ext4_get32(&fs->sb, rev_level) == 0) {
219 ext4_dbg(DEBUG_FS, DBG_INFO "sblock features_incompatible:\n");
220 ext4_fs_debug_features_inc(ext4_get32(&fs->sb, features_incompatible));
222 ext4_dbg(DEBUG_FS, DBG_INFO "sblock features_compatible:\n");
223 ext4_fs_debug_features_comp(ext4_get32(&fs->sb, features_compatible));
225 ext4_dbg(DEBUG_FS, DBG_INFO "sblock features_read_only:\n");
226 ext4_fs_debug_features_ro(ext4_get32(&fs->sb, features_read_only));
228 /*Check features_incompatible*/
229 v = (ext4_get32(&fs->sb, features_incompatible) &
230 (~CONFIG_SUPPORTED_FINCOM));
232 ext4_dbg(DEBUG_FS, DBG_ERROR
233 "sblock has unsupported features incompatible:\n");
234 ext4_fs_debug_features_inc(v);
238 /*Check features_read_only*/
239 v = ext4_get32(&fs->sb, features_read_only);
240 v &= ~CONFIG_SUPPORTED_FRO_COM;
242 ext4_dbg(DEBUG_FS, DBG_WARN
243 "sblock has unsupported features read only:\n");
244 ext4_fs_debug_features_ro(v);
253 /**@brief Determine whether the block is inside the group.
254 * @param baddr block address
255 * @param bgid block group id
258 static bool ext4_block_in_group(struct ext4_sblock *s, ext4_fsblk_t baddr,
261 uint32_t actual_bgid;
262 actual_bgid = ext4_balloc_get_bgid_of_block(s, baddr);
263 if (actual_bgid == bgid)
268 /**@brief To avoid calling the atomic setbit hundreds or thousands of times, we only
269 * need to use it within a single byte (to ensure we get endianness right).
270 * We can use memset for the rest of the bitmap as there are no other users.
272 static void ext4_fs_mark_bitmap_end(int start_bit, int end_bit, void *bitmap)
276 if (start_bit >= end_bit)
279 for (i = start_bit; (unsigned)i < ((start_bit + 7) & ~7UL); i++)
280 ext4_bmap_bit_set(bitmap, i);
283 memset((char *)bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
286 /**@brief Initialize block bitmap in block group.
287 * @param bg_ref Reference to block group
290 static int ext4_fs_init_block_bitmap(struct ext4_block_group_ref *bg_ref)
292 struct ext4_sblock *sb = &bg_ref->fs->sb;
293 struct ext4_bgroup *bg = bg_ref->block_group;
296 uint32_t bit, bit_max;
297 uint32_t group_blocks;
298 uint16_t inode_size = ext4_get16(sb, inode_size);
299 uint32_t block_size = ext4_sb_get_block_size(sb);
300 uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
303 ext4_fsblk_t bmp_blk = ext4_bg_get_block_bitmap(bg, sb);
304 ext4_fsblk_t bmp_inode = ext4_bg_get_inode_bitmap(bg, sb);
305 ext4_fsblk_t inode_table = ext4_bg_get_inode_table_first_block(bg, sb);
306 ext4_fsblk_t first_bg = ext4_balloc_get_block_of_bgid(sb, bg_ref->index);
308 uint32_t dsc_per_block = block_size / ext4_sb_get_desc_size(sb);
310 bool flex_bg = ext4_sb_feature_incom(sb, EXT4_FINCOM_FLEX_BG);
311 bool meta_bg = ext4_sb_feature_incom(sb, EXT4_FINCOM_META_BG);
313 uint32_t inode_table_bcnt = inodes_per_group * inode_size / block_size;
315 struct ext4_block block_bitmap;
316 rc = ext4_trans_block_get_noread(bg_ref->fs->bdev, &block_bitmap, bmp_blk);
320 memset(block_bitmap.data, 0, block_size);
321 bit_max = ext4_sb_is_super_in_bg(sb, bg_ref->index);
323 uint32_t count = ext4_sb_first_meta_bg(sb) * dsc_per_block;
324 if (!meta_bg || bg_ref->index < count) {
326 bit_max += ext4_bg_num_gdb(sb, bg_ref->index);
327 bit_max += ext4_get16(sb, s_reserved_gdt_blocks);
329 } else { /* For META_BG_BLOCK_GROUPS */
330 bit_max += ext4_bg_num_gdb(sb, bg_ref->index);
332 for (bit = 0; bit < bit_max; bit++)
333 ext4_bmap_bit_set(block_bitmap.data, bit);
335 if (bg_ref->index == ext4_block_group_cnt(sb) - 1) {
337 * Even though mke2fs always initialize first and last group
338 * if some other tool enabled the EXT4_BG_BLOCK_UNINIT we need
339 * to make sure we calculate the right free blocks
342 group_blocks = (uint32_t)(ext4_sb_get_blocks_cnt(sb) -
343 ext4_get32(sb, first_data_block) -
344 ext4_get32(sb, blocks_per_group) *
345 (ext4_block_group_cnt(sb) - 1));
347 group_blocks = ext4_get32(sb, blocks_per_group);
351 in_bg = ext4_block_in_group(sb, bmp_blk, bg_ref->index);
352 if (!flex_bg || in_bg)
353 ext4_bmap_bit_set(block_bitmap.data,
354 (uint32_t)(bmp_blk - first_bg));
356 in_bg = ext4_block_in_group(sb, bmp_inode, bg_ref->index);
357 if (!flex_bg || in_bg)
358 ext4_bmap_bit_set(block_bitmap.data,
359 (uint32_t)(bmp_inode - first_bg));
361 for (i = inode_table; i < inode_table + inode_table_bcnt; i++) {
362 in_bg = ext4_block_in_group(sb, i, bg_ref->index);
363 if (!flex_bg || in_bg)
364 ext4_bmap_bit_set(block_bitmap.data,
365 (uint32_t)(i - first_bg));
368 * Also if the number of blocks within the group is
369 * less than the blocksize * 8 ( which is the size
370 * of bitmap ), set rest of the block bitmap to 1
372 ext4_fs_mark_bitmap_end(group_blocks, block_size * 8, block_bitmap.data);
373 ext4_trans_set_block_dirty(block_bitmap.buf);
375 ext4_balloc_set_bitmap_csum(sb, bg_ref->block_group, block_bitmap.data);
376 bg_ref->dirty = true;
379 return ext4_block_set(bg_ref->fs->bdev, &block_bitmap);
382 /**@brief Initialize i-node bitmap in block group.
383 * @param bg_ref Reference to block group
386 static int ext4_fs_init_inode_bitmap(struct ext4_block_group_ref *bg_ref)
389 struct ext4_sblock *sb = &bg_ref->fs->sb;
390 struct ext4_bgroup *bg = bg_ref->block_group;
393 ext4_fsblk_t bitmap_block_addr = ext4_bg_get_inode_bitmap(bg, sb);
396 rc = ext4_trans_block_get_noread(bg_ref->fs->bdev, &b, bitmap_block_addr);
400 /* Initialize all bitmap bits to zero */
401 uint32_t block_size = ext4_sb_get_block_size(sb);
402 uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
404 memset(b.data, 0, (inodes_per_group + 7) / 8);
406 uint32_t start_bit = inodes_per_group;
407 uint32_t end_bit = block_size * 8;
410 for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++)
411 ext4_bmap_bit_set(b.data, i);
414 memset(b.data + (i >> 3), 0xff, (end_bit - i) >> 3);
416 ext4_trans_set_block_dirty(b.buf);
418 ext4_ialloc_set_bitmap_csum(sb, bg, b.data);
419 bg_ref->dirty = true;
422 return ext4_block_set(bg_ref->fs->bdev, &b);
425 /**@brief Initialize i-node table in block group.
426 * @param bg_ref Reference to block group
429 static int ext4_fs_init_inode_table(struct ext4_block_group_ref *bg_ref)
431 struct ext4_sblock *sb = &bg_ref->fs->sb;
432 struct ext4_bgroup *bg = bg_ref->block_group;
434 uint32_t inode_size = ext4_get32(sb, inode_size);
435 uint32_t block_size = ext4_sb_get_block_size(sb);
436 uint32_t inodes_per_block = block_size / inode_size;
437 uint32_t inodes_in_group = ext4_inodes_in_group_cnt(sb, bg_ref->index);
438 uint32_t table_blocks = inodes_in_group / inodes_per_block;
441 if (inodes_in_group % inodes_per_block)
444 /* Compute initialization bounds */
445 ext4_fsblk_t first_block = ext4_bg_get_inode_table_first_block(bg, sb);
447 ext4_fsblk_t last_block = first_block + table_blocks - 1;
449 /* Initialization of all itable blocks */
450 for (fblock = first_block; fblock <= last_block; ++fblock) {
452 int rc = ext4_trans_block_get_noread(bg_ref->fs->bdev, &b, fblock);
456 memset(b.data, 0, block_size);
457 ext4_trans_set_block_dirty(b.buf);
459 ext4_block_set(bg_ref->fs->bdev, &b);
467 static ext4_fsblk_t ext4_fs_get_descriptor_block(struct ext4_sblock *s,
469 uint32_t dsc_per_block)
471 uint32_t first_meta_bg, dsc_id;
473 dsc_id = bgid / dsc_per_block;
474 first_meta_bg = ext4_sb_first_meta_bg(s);
476 bool meta_bg = ext4_sb_feature_incom(s, EXT4_FINCOM_META_BG);
478 if (!meta_bg || dsc_id < first_meta_bg)
479 return ext4_get32(s, first_data_block) + dsc_id + 1;
481 if (ext4_sb_is_super_in_bg(s, bgid))
484 return (has_super + ext4_fs_first_bg_block_no(s, bgid));
487 /**@brief Compute checksum of block group descriptor.
488 * @param sb Superblock
489 * @param bgid Index of block group in the filesystem
490 * @param bg Block group to compute checksum for
491 * @return Checksum value
493 static uint16_t ext4_fs_bg_checksum(struct ext4_sblock *sb, uint32_t bgid,
494 struct ext4_bgroup *bg)
496 /* If checksum not supported, 0 will be returned */
498 #if CONFIG_META_CSUM_ENABLE
499 /* Compute the checksum only if the filesystem supports it */
500 if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
501 /* Use metadata_csum algorithm instead */
502 uint32_t le32_bgid = to_le32(bgid);
503 uint32_t orig_checksum, checksum;
505 /* Preparation: temporarily set bg checksum to 0 */
506 orig_checksum = bg->checksum;
509 /* First calculate crc32 checksum against fs uuid */
510 checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid,
512 /* Then calculate crc32 checksum against bgid */
513 checksum = ext4_crc32c(checksum, &le32_bgid, sizeof(bgid));
514 /* Finally calculate crc32 checksum against block_group_desc */
515 checksum = ext4_crc32c(checksum, bg, ext4_sb_get_desc_size(sb));
516 bg->checksum = orig_checksum;
518 crc = checksum & 0xFFFF;
522 if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_GDT_CSUM)) {
523 uint8_t *base = (uint8_t *)bg;
524 uint8_t *checksum = (uint8_t *)&bg->checksum;
526 uint32_t offset = (uint32_t)(checksum - base);
528 /* Convert block group index to little endian */
529 uint32_t group = to_le32(bgid);
532 crc = ext4_bg_crc16(~0, sb->uuid, sizeof(sb->uuid));
534 /* Include index of block group */
535 crc = ext4_bg_crc16(crc, (uint8_t *)&group, sizeof(group));
537 /* Compute crc from the first part (stop before checksum field)
539 crc = ext4_bg_crc16(crc, (uint8_t *)bg, offset);
542 offset += sizeof(bg->checksum);
544 /* Checksum of the rest of block group descriptor */
545 if ((ext4_sb_feature_incom(sb, EXT4_FINCOM_64BIT)) &&
546 (offset < ext4_sb_get_desc_size(sb))) {
548 const uint8_t *start = ((uint8_t *)bg) + offset;
549 size_t len = ext4_sb_get_desc_size(sb) - offset;
550 crc = ext4_bg_crc16(crc, start, len);
556 #if CONFIG_META_CSUM_ENABLE
557 static bool ext4_fs_verify_bg_csum(struct ext4_sblock *sb,
559 struct ext4_bgroup *bg)
561 if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
564 return ext4_fs_bg_checksum(sb, bgid, bg) == to_le16(bg->checksum);
567 #define ext4_fs_verify_bg_csum(...) true
570 int ext4_fs_get_block_group_ref(struct ext4_fs *fs, uint32_t bgid,
571 struct ext4_block_group_ref *ref)
573 /* Compute number of descriptors, that fits in one data block */
574 uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
575 uint32_t dsc_cnt = block_size / ext4_sb_get_desc_size(&fs->sb);
577 /* Block group descriptor table starts at the next block after
579 uint64_t block_id = ext4_fs_get_descriptor_block(&fs->sb, bgid, dsc_cnt);
581 uint32_t offset = (bgid % dsc_cnt) * ext4_sb_get_desc_size(&fs->sb);
583 int rc = ext4_trans_block_get(fs->bdev, &ref->block, block_id);
587 ref->block_group = (void *)(ref->block.data + offset);
591 struct ext4_bgroup *bg = ref->block_group;
593 if (!ext4_fs_verify_bg_csum(&fs->sb, bgid, bg)) {
595 DBG_WARN "Block group descriptor checksum failed."
596 "Block group index: %" PRIu32"\n",
600 if (ext4_bg_has_flag(bg, EXT4_BLOCK_GROUP_BLOCK_UNINIT)) {
601 rc = ext4_fs_init_block_bitmap(ref);
603 ext4_block_set(fs->bdev, &ref->block);
606 ext4_bg_clear_flag(bg, EXT4_BLOCK_GROUP_BLOCK_UNINIT);
610 if (ext4_bg_has_flag(bg, EXT4_BLOCK_GROUP_INODE_UNINIT)) {
611 rc = ext4_fs_init_inode_bitmap(ref);
613 ext4_block_set(ref->fs->bdev, &ref->block);
617 ext4_bg_clear_flag(bg, EXT4_BLOCK_GROUP_INODE_UNINIT);
619 if (!ext4_bg_has_flag(bg, EXT4_BLOCK_GROUP_ITABLE_ZEROED)) {
620 rc = ext4_fs_init_inode_table(ref);
622 ext4_block_set(fs->bdev, &ref->block);
626 ext4_bg_set_flag(bg, EXT4_BLOCK_GROUP_ITABLE_ZEROED);
635 int ext4_fs_put_block_group_ref(struct ext4_block_group_ref *ref)
637 /* Check if reference modified */
639 /* Compute new checksum of block group */
641 cs = ext4_fs_bg_checksum(&ref->fs->sb, ref->index,
643 ref->block_group->checksum = to_le16(cs);
645 /* Mark block dirty for writing changes to physical device */
646 ext4_trans_set_block_dirty(ref->block.buf);
649 /* Put back block, that contains block group descriptor */
650 return ext4_block_set(ref->fs->bdev, &ref->block);
653 #if CONFIG_META_CSUM_ENABLE
654 static uint32_t ext4_fs_inode_checksum(struct ext4_inode_ref *inode_ref)
656 uint32_t checksum = 0;
657 struct ext4_sblock *sb = &inode_ref->fs->sb;
658 uint16_t inode_size = ext4_get16(sb, inode_size);
660 if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
661 uint32_t orig_checksum;
663 uint32_t ino_index = to_le32(inode_ref->index);
665 to_le32(ext4_inode_get_generation(inode_ref->inode));
667 /* Preparation: temporarily set bg checksum to 0 */
668 orig_checksum = ext4_inode_get_csum(sb, inode_ref->inode);
669 ext4_inode_set_csum(sb, inode_ref->inode, 0);
671 /* First calculate crc32 checksum against fs uuid */
672 checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid,
674 /* Then calculate crc32 checksum against inode number
675 * and inode generation */
676 checksum = ext4_crc32c(checksum, &ino_index, sizeof(ino_index));
677 checksum = ext4_crc32c(checksum, &ino_gen, sizeof(ino_gen));
678 /* Finally calculate crc32 checksum against
679 * the entire inode */
680 checksum = ext4_crc32c(checksum, inode_ref->inode, inode_size);
681 ext4_inode_set_csum(sb, inode_ref->inode, orig_checksum);
683 /* If inode size is not large enough to hold the
684 * upper 16bit of the checksum */
685 if (inode_size == EXT4_GOOD_OLD_INODE_SIZE)
692 #define ext4_fs_inode_checksum(...) 0
695 static void ext4_fs_set_inode_checksum(struct ext4_inode_ref *inode_ref)
697 struct ext4_sblock *sb = &inode_ref->fs->sb;
698 if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
701 uint32_t csum = ext4_fs_inode_checksum(inode_ref);
702 ext4_inode_set_csum(sb, inode_ref->inode, csum);
705 #if CONFIG_META_CSUM_ENABLE
706 static bool ext4_fs_verify_inode_csum(struct ext4_inode_ref *inode_ref)
708 struct ext4_sblock *sb = &inode_ref->fs->sb;
709 if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
712 return ext4_inode_get_csum(sb, inode_ref->inode) ==
713 ext4_fs_inode_checksum(inode_ref);
716 #define ext4_fs_verify_inode_csum(...) true
720 __ext4_fs_get_inode_ref(struct ext4_fs *fs, uint32_t index,
721 struct ext4_inode_ref *ref,
724 /* Compute number of i-nodes, that fits in one data block */
725 uint32_t inodes_per_group = ext4_get32(&fs->sb, inodes_per_group);
728 * Inode numbers are 1-based, but it is simpler to work with 0-based
729 * when computing indices
732 uint32_t block_group = index / inodes_per_group;
733 uint32_t offset_in_group = index % inodes_per_group;
735 /* Load block group, where i-node is located */
736 struct ext4_block_group_ref bg_ref;
738 int rc = ext4_fs_get_block_group_ref(fs, block_group, &bg_ref);
743 /* Load block address, where i-node table is located */
744 ext4_fsblk_t inode_table_start =
745 ext4_bg_get_inode_table_first_block(bg_ref.block_group, &fs->sb);
747 /* Put back block group reference (not needed more) */
748 rc = ext4_fs_put_block_group_ref(&bg_ref);
753 /* Compute position of i-node in the block group */
754 uint16_t inode_size = ext4_get16(&fs->sb, inode_size);
755 uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
756 uint32_t byte_offset_in_group = offset_in_group * inode_size;
758 /* Compute block address */
759 ext4_fsblk_t block_id =
760 inode_table_start + (byte_offset_in_group / block_size);
762 rc = ext4_trans_block_get(fs->bdev, &ref->block, block_id);
767 /* Compute position of i-node in the data block */
768 uint32_t offset_in_block = byte_offset_in_group % block_size;
769 ref->inode = (struct ext4_inode *)(ref->block.data + offset_in_block);
771 /* We need to store the original value of index in the reference */
772 ref->index = index + 1;
776 if (initialized && !ext4_fs_verify_inode_csum(ref)) {
778 DBG_WARN "Inode checksum failed."
779 "Inode: %" PRIu32"\n",
786 int ext4_fs_get_inode_ref(struct ext4_fs *fs, uint32_t index,
787 struct ext4_inode_ref *ref)
789 return __ext4_fs_get_inode_ref(fs, index, ref, true);
792 int ext4_fs_put_inode_ref(struct ext4_inode_ref *ref)
794 /* Check if reference modified */
796 /* Mark block dirty for writing changes to physical device */
797 ext4_fs_set_inode_checksum(ref);
798 ext4_trans_set_block_dirty(ref->block.buf);
801 /* Put back block, that contains i-node */
802 return ext4_block_set(ref->fs->bdev, &ref->block);
805 void ext4_fs_inode_blocks_init(struct ext4_fs *fs,
806 struct ext4_inode_ref *inode_ref)
809 struct ext4_inode *inode = inode_ref->inode;
811 for (i = 0; i < EXT4_INODE_BLOCKS; i++)
812 inode->blocks[i] = 0;
815 #if CONFIG_EXTENT_ENABLE
816 /* Initialize extents if needed */
817 if (ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS)) {
818 ext4_inode_set_flag(inode, EXT4_INODE_FLAG_EXTENTS);
820 /* Initialize extent root header */
821 ext4_extent_tree_init(inode_ref);
826 uint32_t ext4_fs_correspond_inode_mode(int filetype)
830 return EXT4_INODE_MODE_DIRECTORY;
831 case EXT4_DE_REG_FILE:
832 return EXT4_INODE_MODE_FILE;
833 case EXT4_DE_SYMLINK:
834 return EXT4_INODE_MODE_SOFTLINK;
836 /* FIXME: right now we only support 3 file type. */
842 int ext4_fs_alloc_inode(struct ext4_fs *fs, struct ext4_inode_ref *inode_ref,
845 /* Check if newly allocated i-node will be a directory */
847 uint16_t inode_size = ext4_get16(&fs->sb, inode_size);
849 is_dir = (filetype == EXT4_DE_DIR);
851 /* Allocate inode by allocation algorithm */
853 int rc = ext4_ialloc_alloc_inode(fs, &index, is_dir);
857 /* Load i-node from on-disk i-node table */
858 rc = __ext4_fs_get_inode_ref(fs, index, inode_ref, false);
860 ext4_ialloc_free_inode(fs, index, is_dir);
864 /* Initialize i-node */
865 struct ext4_inode *inode = inode_ref->inode;
870 * Default directory permissions to be compatible with other
872 * 0777 (octal) == rwxrwxrwx
876 mode |= EXT4_INODE_MODE_DIRECTORY;
879 * Default file permissions to be compatible with other systems
880 * 0666 (octal) == rw-rw-rw-
884 mode |= ext4_fs_correspond_inode_mode(filetype);
886 ext4_inode_set_mode(&fs->sb, inode, mode);
888 ext4_inode_set_links_cnt(inode, 0);
889 ext4_inode_set_uid(inode, 0);
890 ext4_inode_set_gid(inode, 0);
891 ext4_inode_set_size(inode, 0);
892 ext4_inode_set_access_time(inode, 0);
893 ext4_inode_set_change_inode_time(inode, 0);
894 ext4_inode_set_modif_time(inode, 0);
895 ext4_inode_set_del_time(inode, 0);
896 ext4_inode_set_blocks_count(&fs->sb, inode, 0);
897 ext4_inode_set_flags(inode, 0);
898 ext4_inode_set_generation(inode, 0);
899 if (inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
900 uint16_t off = offsetof(struct ext4_inode, extra_isize);
901 uint16_t size = sizeof(struct ext4_inode) - off;
902 ext4_inode_set_extra_isize(inode, size);
905 /* Reset blocks array. For symbolic link inode, just
906 * fill in blocks with 0 */
907 if (ext4_inode_is_type(&fs->sb, inode, EXT4_INODE_MODE_SOFTLINK)) {
908 for (int i = 0; i < EXT4_INODE_BLOCKS; i++)
909 inode->blocks[i] = 0;
912 ext4_fs_inode_blocks_init(fs, inode_ref);
915 inode_ref->dirty = true;
920 int ext4_fs_free_inode(struct ext4_inode_ref *inode_ref)
922 struct ext4_fs *fs = inode_ref->fs;
926 #if CONFIG_EXTENT_ENABLE
927 /* For extents must be data block destroyed by other way */
928 if ((ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS)) &&
929 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
930 /* Data structures are released during truncate operation... */
934 /* Release all indirect (no data) blocks */
936 /* 1) Single indirect */
937 ext4_fsblk_t fblock = ext4_inode_get_indirect_block(inode_ref->inode, 0);
939 int rc = ext4_balloc_free_block(inode_ref, fblock);
943 ext4_inode_set_indirect_block(inode_ref->inode, 0, 0);
946 uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
947 uint32_t count = block_size / sizeof(uint32_t);
949 struct ext4_block block;
951 /* 2) Double indirect */
952 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 1);
954 int rc = ext4_trans_block_get(fs->bdev, &block, fblock);
958 ext4_fsblk_t ind_block;
959 for (offset = 0; offset < count; ++offset) {
960 ind_block = to_le32(((uint32_t *)block.data)[offset]);
964 rc = ext4_balloc_free_block(inode_ref, ind_block);
966 ext4_block_set(fs->bdev, &block);
972 ext4_block_set(fs->bdev, &block);
973 rc = ext4_balloc_free_block(inode_ref, fblock);
977 ext4_inode_set_indirect_block(inode_ref->inode, 1, 0);
980 /* 3) Tripple indirect */
981 struct ext4_block subblock;
982 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 2);
985 rc = ext4_trans_block_get(fs->bdev, &block, fblock);
989 ext4_fsblk_t ind_block;
990 for (offset = 0; offset < count; ++offset) {
991 ind_block = to_le32(((uint32_t *)block.data)[offset]);
995 rc = ext4_trans_block_get(fs->bdev, &subblock,
998 ext4_block_set(fs->bdev, &block);
1002 ext4_fsblk_t ind_subblk;
1003 for (suboff = 0; suboff < count; ++suboff) {
1004 ind_subblk = to_le32(((uint32_t *)subblock.data)[suboff]);
1006 if (ind_subblk == 0)
1008 rc = ext4_balloc_free_block(inode_ref, ind_subblk);
1010 ext4_block_set(fs->bdev, &subblock);
1011 ext4_block_set(fs->bdev, &block);
1017 ext4_block_set(fs->bdev, &subblock);
1019 rc = ext4_balloc_free_block(inode_ref,
1022 ext4_block_set(fs->bdev, &block);
1028 ext4_block_set(fs->bdev, &block);
1029 rc = ext4_balloc_free_block(inode_ref, fblock);
1033 ext4_inode_set_indirect_block(inode_ref->inode, 2, 0);
1035 /* Mark inode dirty for writing to the physical device */
1036 inode_ref->dirty = true;
1038 /* Free block with extended attributes if present */
1039 ext4_fsblk_t xattr_block =
1040 ext4_inode_get_file_acl(inode_ref->inode, &fs->sb);
1042 int rc = ext4_balloc_free_block(inode_ref, xattr_block);
1046 ext4_inode_set_file_acl(inode_ref->inode, &fs->sb, 0);
1049 /* Free inode by allocator */
1050 if (ext4_inode_is_type(&fs->sb, inode_ref->inode,
1051 EXT4_INODE_MODE_DIRECTORY))
1052 rc = ext4_ialloc_free_inode(fs, inode_ref->index, true);
1054 rc = ext4_ialloc_free_inode(fs, inode_ref->index, false);
1060 /**@brief Release data block from i-node
1061 * @param inode_ref I-node to release block from
1062 * @param iblock Logical block to be released
1063 * @return Error code
1065 static int ext4_fs_release_inode_block(struct ext4_inode_ref *inode_ref,
1068 ext4_fsblk_t fblock;
1070 struct ext4_fs *fs = inode_ref->fs;
1072 /* Extents are handled otherwise = there is not support in this function
1075 ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS) &&
1076 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))));
1078 struct ext4_inode *inode = inode_ref->inode;
1080 /* Handle simple case when we are dealing with direct reference */
1081 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
1082 fblock = ext4_inode_get_direct_block(inode, iblock);
1088 ext4_inode_set_direct_block(inode, iblock, 0);
1089 return ext4_balloc_free_block(inode_ref, fblock);
1092 /* Determine the indirection level needed to get the desired block */
1093 unsigned int level = 0;
1095 for (i = 1; i < 4; i++) {
1096 if (iblock < fs->inode_block_limits[i]) {
1105 /* Compute offsets for the topmost level */
1106 uint32_t block_offset_in_level =
1107 (uint32_t)(iblock - fs->inode_block_limits[level - 1]);
1108 ext4_fsblk_t current_block =
1109 ext4_inode_get_indirect_block(inode, level - 1);
1110 uint32_t offset_in_block =
1111 (uint32_t)(block_offset_in_level / fs->inode_blocks_per_level[level - 1]);
1114 * Navigate through other levels, until we find the block number
1115 * or find null reference meaning we are dealing with sparse file
1117 struct ext4_block block;
1122 if (current_block == 0)
1125 int rc = ext4_trans_block_get(fs->bdev, &block, current_block);
1130 to_le32(((uint32_t *)block.data)[offset_in_block]);
1132 /* Set zero if physical data block address found */
1134 ((uint32_t *)block.data)[offset_in_block] = to_le32(0);
1135 ext4_trans_set_block_dirty(block.buf);
1138 rc = ext4_block_set(fs->bdev, &block);
1145 * If we are on the last level, break here as
1146 * there is no next level to visit
1151 /* Visit the next level */
1152 block_offset_in_level %= fs->inode_blocks_per_level[level];
1153 offset_in_block = (uint32_t)(block_offset_in_level /
1154 fs->inode_blocks_per_level[level - 1]);
1157 fblock = current_block;
1161 /* Physical block is not referenced, it can be released */
1162 return ext4_balloc_free_block(inode_ref, fblock);
1165 int ext4_fs_truncate_inode(struct ext4_inode_ref *inode_ref, uint64_t new_size)
1167 struct ext4_sblock *sb = &inode_ref->fs->sb;
1171 /* Check flags, if i-node can be truncated */
1172 if (!ext4_inode_can_truncate(sb, inode_ref->inode))
1175 /* If sizes are equal, nothing has to be done. */
1176 uint64_t old_size = ext4_inode_get_size(sb, inode_ref->inode);
1177 if (old_size == new_size)
1180 /* It's not supported to make the larger file by truncate operation */
1181 if (old_size < new_size)
1185 v = ext4_inode_is_type(sb, inode_ref->inode, EXT4_INODE_MODE_SOFTLINK);
1186 if (v && old_size < sizeof(inode_ref->inode->blocks) &&
1187 !ext4_inode_get_blocks_count(sb, inode_ref->inode)) {
1188 char *content = (char *)inode_ref->inode->blocks + new_size;
1190 sizeof(inode_ref->inode->blocks) - (uint32_t)new_size);
1191 ext4_inode_set_size(inode_ref->inode, new_size);
1192 inode_ref->dirty = true;
1197 /* Compute how many blocks will be released */
1198 uint32_t block_size = ext4_sb_get_block_size(sb);
1199 uint32_t new_blocks_cnt = (uint32_t)((new_size + block_size - 1) / block_size);
1200 uint32_t old_blocks_cnt = (uint32_t)((old_size + block_size - 1) / block_size);
1201 uint32_t diff_blocks_cnt = old_blocks_cnt - new_blocks_cnt;
1202 #if CONFIG_EXTENT_ENABLE
1203 if ((ext4_sb_feature_incom(sb, EXT4_FINCOM_EXTENTS)) &&
1204 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
1206 /* Extents require special operation */
1207 if (diff_blocks_cnt) {
1208 r = ext4_extent_remove_space(inode_ref, new_blocks_cnt,
1217 /* Release data blocks from the end of file */
1219 /* Starting from 1 because of logical blocks are numbered from 0
1221 for (i = 0; i < diff_blocks_cnt; ++i) {
1222 r = ext4_fs_release_inode_block(inode_ref,
1223 new_blocks_cnt + i);
1230 ext4_inode_set_size(inode_ref->inode, new_size);
1231 inode_ref->dirty = true;
1236 /**@brief Compute 'goal' for inode index
1237 * @param inode_ref Reference to inode, to allocate block for
1240 ext4_fsblk_t ext4_fs_inode_to_goal_block(struct ext4_inode_ref *inode_ref)
1242 uint32_t grp_inodes = ext4_get32(&inode_ref->fs->sb, inodes_per_group);
1243 return (inode_ref->index - 1) / grp_inodes;
1246 /**@brief Compute 'goal' for allocation algorithm (For blockmap).
1247 * @param inode_ref Reference to inode, to allocate block for
1249 * @return error code
1251 int ext4_fs_indirect_find_goal(struct ext4_inode_ref *inode_ref,
1255 struct ext4_sblock *sb = &inode_ref->fs->sb;
1258 uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
1259 uint32_t block_size = ext4_sb_get_block_size(sb);
1260 uint32_t iblock_cnt = (uint32_t)(inode_size / block_size);
1262 if (inode_size % block_size != 0)
1265 /* If inode has some blocks, get last block address + 1 */
1266 if (iblock_cnt > 0) {
1267 r = ext4_fs_get_inode_dblk_idx(inode_ref, iblock_cnt - 1,
1277 /* If goal == 0, sparse file -> continue */
1280 /* Identify block group of inode */
1282 uint32_t inodes_per_bg = ext4_get32(sb, inodes_per_group);
1283 uint32_t block_group = (inode_ref->index - 1) / inodes_per_bg;
1284 block_size = ext4_sb_get_block_size(sb);
1286 /* Load block group reference */
1287 struct ext4_block_group_ref bg_ref;
1288 r = ext4_fs_get_block_group_ref(inode_ref->fs, block_group, &bg_ref);
1292 struct ext4_bgroup *bg = bg_ref.block_group;
1294 /* Compute indexes */
1295 uint32_t bg_count = ext4_block_group_cnt(sb);
1296 ext4_fsblk_t itab_first_block = ext4_bg_get_inode_table_first_block(bg, sb);
1297 uint16_t itab_item_size = ext4_get16(sb, inode_size);
1298 uint32_t itab_bytes;
1300 /* Check for last block group */
1301 if (block_group < bg_count - 1) {
1302 itab_bytes = inodes_per_bg * itab_item_size;
1304 /* Last block group could be smaller */
1305 uint32_t inodes_cnt = ext4_get32(sb, inodes_count);
1307 itab_bytes = (inodes_cnt - ((bg_count - 1) * inodes_per_bg));
1308 itab_bytes *= itab_item_size;
1311 ext4_fsblk_t inode_table_blocks = itab_bytes / block_size;
1313 if (itab_bytes % block_size)
1314 inode_table_blocks++;
1316 *goal = itab_first_block + inode_table_blocks;
1318 return ext4_fs_put_block_group_ref(&bg_ref);
1321 static int ext4_fs_get_inode_dblk_idx_internal(struct ext4_inode_ref *inode_ref,
1322 ext4_lblk_t iblock, ext4_fsblk_t *fblock,
1324 bool support_unwritten __unused)
1326 struct ext4_fs *fs = inode_ref->fs;
1328 /* For empty file is situation simple */
1329 if (ext4_inode_get_size(&fs->sb, inode_ref->inode) == 0) {
1334 ext4_fsblk_t current_block;
1336 (void)extent_create;
1337 #if CONFIG_EXTENT_ENABLE
1338 /* Handle i-node using extents */
1339 if ((ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS)) &&
1340 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
1342 ext4_fsblk_t current_fsblk;
1343 int rc = ext4_extent_get_blocks(inode_ref, iblock, 1,
1344 ¤t_fsblk, extent_create, NULL);
1348 current_block = current_fsblk;
1349 *fblock = current_block;
1351 ext4_assert(*fblock || support_unwritten);
1356 struct ext4_inode *inode = inode_ref->inode;
1358 /* Direct block are read directly from array in i-node structure */
1359 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
1361 ext4_inode_get_direct_block(inode, (uint32_t)iblock);
1362 *fblock = current_block;
1366 /* Determine indirection level of the target block */
1369 for (i = 1; i < 4; i++) {
1370 if (iblock < fs->inode_block_limits[i]) {
1379 /* Compute offsets for the topmost level */
1380 uint32_t blk_off_in_lvl = (uint32_t)(iblock - fs->inode_block_limits[l - 1]);
1381 current_block = ext4_inode_get_indirect_block(inode, l - 1);
1382 uint32_t off_in_blk = (uint32_t)(blk_off_in_lvl / fs->inode_blocks_per_level[l - 1]);
1385 if (current_block == 0) {
1390 struct ext4_block block;
1393 * Navigate through other levels, until we find the block number
1394 * or find null reference meaning we are dealing with sparse file
1397 /* Load indirect block */
1398 int rc = ext4_trans_block_get(fs->bdev, &block, current_block);
1402 /* Read block address from indirect block */
1404 to_le32(((uint32_t *)block.data)[off_in_blk]);
1406 /* Put back indirect block untouched */
1407 rc = ext4_block_set(fs->bdev, &block);
1411 /* Check for sparse file */
1412 if (current_block == 0) {
1417 /* Jump to the next level */
1420 /* Termination condition - we have address of data block loaded
1425 /* Visit the next level */
1426 blk_off_in_lvl %= fs->inode_blocks_per_level[l];
1427 off_in_blk = (uint32_t)(blk_off_in_lvl / fs->inode_blocks_per_level[l - 1]);
1430 *fblock = current_block;
1436 int ext4_fs_get_inode_dblk_idx(struct ext4_inode_ref *inode_ref,
1437 ext4_lblk_t iblock, ext4_fsblk_t *fblock,
1438 bool support_unwritten)
1440 return ext4_fs_get_inode_dblk_idx_internal(inode_ref, iblock, fblock,
1441 false, support_unwritten);
1444 int ext4_fs_init_inode_dblk_idx(struct ext4_inode_ref *inode_ref,
1445 ext4_lblk_t iblock, ext4_fsblk_t *fblock)
1447 return ext4_fs_get_inode_dblk_idx_internal(inode_ref, iblock, fblock,
1451 static int ext4_fs_set_inode_data_block_index(struct ext4_inode_ref *inode_ref,
1452 ext4_lblk_t iblock, ext4_fsblk_t fblock)
1454 struct ext4_fs *fs = inode_ref->fs;
1456 #if CONFIG_EXTENT_ENABLE
1457 /* Handle inode using extents */
1458 if ((ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS)) &&
1459 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
1465 /* Handle simple case when we are dealing with direct reference */
1466 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
1467 ext4_inode_set_direct_block(inode_ref->inode, (uint32_t)iblock,
1469 inode_ref->dirty = true;
1474 /* Determine the indirection level needed to get the desired block */
1477 for (i = 1; i < 4; i++) {
1478 if (iblock < fs->inode_block_limits[i]) {
1487 uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
1489 /* Compute offsets for the topmost level */
1490 uint32_t blk_off_in_lvl = (uint32_t)(iblock - fs->inode_block_limits[l - 1]);
1491 ext4_fsblk_t current_block =
1492 ext4_inode_get_indirect_block(inode_ref->inode, l - 1);
1493 uint32_t off_in_blk = (uint32_t)(blk_off_in_lvl / fs->inode_blocks_per_level[l - 1]);
1495 ext4_fsblk_t new_blk;
1497 struct ext4_block block;
1498 struct ext4_block new_block;
1500 /* Is needed to allocate indirect block on the i-node level */
1501 if (current_block == 0) {
1502 /* Allocate new indirect block */
1504 int rc = ext4_fs_indirect_find_goal(inode_ref, &goal);
1508 rc = ext4_balloc_alloc_block(inode_ref, goal, &new_blk);
1513 ext4_inode_set_indirect_block(inode_ref->inode, l - 1,
1515 inode_ref->dirty = true;
1517 /* Load newly allocated block */
1518 rc = ext4_trans_block_get_noread(fs->bdev, &new_block, new_blk);
1520 ext4_balloc_free_block(inode_ref, new_blk);
1524 /* Initialize new block */
1525 memset(new_block.data, 0, block_size);
1526 ext4_trans_set_block_dirty(new_block.buf);
1528 /* Put back the allocated block */
1529 rc = ext4_block_set(fs->bdev, &new_block);
1533 current_block = new_blk;
1537 * Navigate through other levels, until we find the block number
1538 * or find null reference meaning we are dealing with sparse file
1541 int rc = ext4_trans_block_get(fs->bdev, &block, current_block);
1545 current_block = to_le32(((uint32_t *)block.data)[off_in_blk]);
1546 if ((l > 1) && (current_block == 0)) {
1548 rc = ext4_fs_indirect_find_goal(inode_ref, &goal);
1550 ext4_block_set(fs->bdev, &block);
1554 /* Allocate new block */
1556 ext4_balloc_alloc_block(inode_ref, goal, &new_blk);
1558 ext4_block_set(fs->bdev, &block);
1562 /* Load newly allocated block */
1563 rc = ext4_trans_block_get_noread(fs->bdev, &new_block,
1567 ext4_block_set(fs->bdev, &block);
1571 /* Initialize allocated block */
1572 memset(new_block.data, 0, block_size);
1573 ext4_trans_set_block_dirty(new_block.buf);
1575 rc = ext4_block_set(fs->bdev, &new_block);
1577 ext4_block_set(fs->bdev, &block);
1581 /* Write block address to the parent */
1582 uint32_t * p = (uint32_t * )block.data;
1583 p[off_in_blk] = to_le32((uint32_t)new_blk);
1584 ext4_trans_set_block_dirty(block.buf);
1585 current_block = new_blk;
1588 /* Will be finished, write the fblock address */
1590 uint32_t * p = (uint32_t * )block.data;
1591 p[off_in_blk] = to_le32((uint32_t)fblock);
1592 ext4_trans_set_block_dirty(block.buf);
1595 rc = ext4_block_set(fs->bdev, &block);
1602 * If we are on the last level, break here as
1603 * there is no next level to visit
1608 /* Visit the next level */
1609 blk_off_in_lvl %= fs->inode_blocks_per_level[l];
1610 off_in_blk = (uint32_t)(blk_off_in_lvl / fs->inode_blocks_per_level[l - 1]);
1617 int ext4_fs_append_inode_dblk(struct ext4_inode_ref *inode_ref,
1618 ext4_fsblk_t *fblock, ext4_lblk_t *iblock)
1620 #if CONFIG_EXTENT_ENABLE
1621 /* Handle extents separately */
1622 if ((ext4_sb_feature_incom(&inode_ref->fs->sb, EXT4_FINCOM_EXTENTS)) &&
1623 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
1625 ext4_fsblk_t current_fsblk;
1626 struct ext4_sblock *sb = &inode_ref->fs->sb;
1627 uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
1628 uint32_t block_size = ext4_sb_get_block_size(sb);
1629 *iblock = (uint32_t)((inode_size + block_size - 1) / block_size);
1631 rc = ext4_extent_get_blocks(inode_ref, *iblock, 1,
1632 ¤t_fsblk, true, NULL);
1634 *fblock = current_fsblk;
1635 ext4_assert(*fblock);
1637 ext4_inode_set_size(inode_ref->inode, inode_size + block_size);
1638 inode_ref->dirty = true;
1644 struct ext4_sblock *sb = &inode_ref->fs->sb;
1646 /* Compute next block index and allocate data block */
1647 uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
1648 uint32_t block_size = ext4_sb_get_block_size(sb);
1650 /* Align size i-node size */
1651 if ((inode_size % block_size) != 0)
1652 inode_size += block_size - (inode_size % block_size);
1654 /* Logical blocks are numbered from 0 */
1655 uint32_t new_block_idx = (uint32_t)(inode_size / block_size);
1657 /* Allocate new physical block */
1658 ext4_fsblk_t goal, phys_block;
1659 int rc = ext4_fs_indirect_find_goal(inode_ref, &goal);
1663 rc = ext4_balloc_alloc_block(inode_ref, goal, &phys_block);
1667 /* Add physical block address to the i-node */
1668 rc = ext4_fs_set_inode_data_block_index(inode_ref, new_block_idx,
1671 ext4_balloc_free_block(inode_ref, phys_block);
1676 ext4_inode_set_size(inode_ref->inode, inode_size + block_size);
1677 inode_ref->dirty = true;
1679 *fblock = phys_block;
1680 *iblock = new_block_idx;
1685 void ext4_fs_inode_links_count_inc(struct ext4_inode_ref *inode_ref)
1689 link = ext4_inode_get_links_cnt(inode_ref->inode);
1691 ext4_inode_set_links_cnt(inode_ref->inode, link);
1693 is_dx = ext4_sb_feature_com(&inode_ref->fs->sb, EXT4_FCOM_DIR_INDEX) &&
1694 ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_INDEX);
1696 if (is_dx && link > 1) {
1697 if (link >= EXT4_LINK_MAX || link == 2) {
1698 ext4_inode_set_links_cnt(inode_ref->inode, 1);
1701 v = ext4_get32(&inode_ref->fs->sb, features_read_only);
1702 v |= EXT4_FRO_COM_DIR_NLINK;
1703 ext4_set32(&inode_ref->fs->sb, features_read_only, v);
1708 void ext4_fs_inode_links_count_dec(struct ext4_inode_ref *inode_ref)
1710 uint16_t links = ext4_inode_get_links_cnt(inode_ref->inode);
1711 if (!ext4_inode_is_type(&inode_ref->fs->sb, inode_ref->inode,
1712 EXT4_INODE_MODE_DIRECTORY)) {
1714 ext4_inode_set_links_cnt(inode_ref->inode, links - 1);
1719 ext4_inode_set_links_cnt(inode_ref->inode, links - 1);