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"
44 #include "ext4_errno.h"
45 #include "ext4_blockdev.h"
46 #include "ext4_super.h"
47 #include "ext4_crc32c.h"
48 #include "ext4_debug.h"
49 #include "ext4_block_group.h"
50 #include "ext4_balloc.h"
51 #include "ext4_bitmap.h"
52 #include "ext4_inode.h"
53 #include "ext4_ialloc.h"
54 #include "ext4_extent.h"
58 int ext4_fs_init(struct ext4_fs *fs, struct ext4_blockdev *bdev)
63 bool read_only = false;
65 ext4_assert(fs && bdev);
69 r = ext4_sb_read(fs->bdev, &fs->sb);
73 if (!ext4_sb_check(&fs->sb))
76 bsize = ext4_sb_get_block_size(&fs->sb);
77 if (bsize > EXT4_MAX_BLOCK_SIZE)
80 r = ext4_fs_check_features(fs, &read_only);
87 /* Compute limits for indirect block levels */
88 uint32_t blocks_id = bsize / sizeof(uint32_t);
90 fs->inode_block_limits[0] = EXT4_INODE_DIRECT_BLOCK_COUNT;
91 fs->inode_blocks_per_level[0] = 1;
93 for (i = 1; i < 4; i++) {
94 fs->inode_blocks_per_level[i] =
95 fs->inode_blocks_per_level[i - 1] * blocks_id;
96 fs->inode_block_limits[i] = fs->inode_block_limits[i - 1] +
97 fs->inode_blocks_per_level[i];
101 tmp = ext4_get16(&fs->sb, state);
102 if (tmp & EXT4_SUPERBLOCK_STATE_ERROR_FS)
103 ext4_dbg(DEBUG_FS, DBG_WARN
104 "last umount error: superblock fs_error flag\n");
107 /* Mark system as mounted */
108 ext4_set16(&fs->sb, state, EXT4_SUPERBLOCK_STATE_ERROR_FS);
109 r = ext4_sb_write(fs->bdev, &fs->sb);
113 /*Update mount count*/
114 ext4_set16(&fs->sb, mount_count, ext4_get16(&fs->sb, mount_count) + 1);
119 int ext4_fs_fini(struct ext4_fs *fs)
123 /*Set superblock state*/
124 ext4_set16(&fs->sb, state, EXT4_SUPERBLOCK_STATE_VALID_FS);
126 return ext4_sb_write(fs->bdev, &fs->sb);
129 static void ext4_fs_debug_features_inc(uint32_t features_incompatible)
131 if (features_incompatible & EXT4_FINCOM_COMPRESSION)
132 ext4_dbg(DEBUG_FS, DBG_NONE "compression\n");
133 if (features_incompatible & EXT4_FINCOM_FILETYPE)
134 ext4_dbg(DEBUG_FS, DBG_NONE "filetype\n");
135 if (features_incompatible & EXT4_FINCOM_RECOVER)
136 ext4_dbg(DEBUG_FS, DBG_NONE "recover\n");
137 if (features_incompatible & EXT4_FINCOM_JOURNAL_DEV)
138 ext4_dbg(DEBUG_FS, DBG_NONE "journal_dev\n");
139 if (features_incompatible & EXT4_FINCOM_META_BG)
140 ext4_dbg(DEBUG_FS, DBG_NONE "meta_bg\n");
141 if (features_incompatible & EXT4_FINCOM_EXTENTS)
142 ext4_dbg(DEBUG_FS, DBG_NONE "extents\n");
143 if (features_incompatible & EXT4_FINCOM_64BIT)
144 ext4_dbg(DEBUG_FS, DBG_NONE "64bit\n");
145 if (features_incompatible & EXT4_FINCOM_MMP)
146 ext4_dbg(DEBUG_FS, DBG_NONE "mnp\n");
147 if (features_incompatible & EXT4_FINCOM_FLEX_BG)
148 ext4_dbg(DEBUG_FS, DBG_NONE "flex_bg\n");
149 if (features_incompatible & EXT4_FINCOM_EA_INODE)
150 ext4_dbg(DEBUG_FS, DBG_NONE "ea_inode\n");
151 if (features_incompatible & EXT4_FINCOM_DIRDATA)
152 ext4_dbg(DEBUG_FS, DBG_NONE "dirdata\n");
153 if (features_incompatible & EXT4_FINCOM_BG_USE_META_CSUM)
154 ext4_dbg(DEBUG_FS, DBG_NONE "meta_csum\n");
155 if (features_incompatible & EXT4_FINCOM_LARGEDIR)
156 ext4_dbg(DEBUG_FS, DBG_NONE "largedir\n");
157 if (features_incompatible & EXT4_FINCOM_INLINE_DATA)
158 ext4_dbg(DEBUG_FS, DBG_NONE "inline_data\n");
160 static void ext4_fs_debug_features_comp(uint32_t features_compatible)
162 if (features_compatible & EXT4_FCOM_DIR_PREALLOC)
163 ext4_dbg(DEBUG_FS, DBG_NONE "dir_prealloc\n");
164 if (features_compatible & EXT4_FCOM_IMAGIC_INODES)
165 ext4_dbg(DEBUG_FS, DBG_NONE "imagic_inodes\n");
166 if (features_compatible & EXT4_FCOM_HAS_JOURNAL)
167 ext4_dbg(DEBUG_FS, DBG_NONE "has_journal\n");
168 if (features_compatible & EXT4_FCOM_EXT_ATTR)
169 ext4_dbg(DEBUG_FS, DBG_NONE "ext_attr\n");
170 if (features_compatible & EXT4_FCOM_RESIZE_INODE)
171 ext4_dbg(DEBUG_FS, DBG_NONE "resize_inode\n");
172 if (features_compatible & EXT4_FCOM_DIR_INDEX)
173 ext4_dbg(DEBUG_FS, DBG_NONE "dir_index\n");
176 static void ext4_fs_debug_features_ro(uint32_t features_ro)
178 if (features_ro & EXT4_FRO_COM_SPARSE_SUPER)
179 ext4_dbg(DEBUG_FS, DBG_NONE "sparse_super\n");
180 if (features_ro & EXT4_FRO_COM_LARGE_FILE)
181 ext4_dbg(DEBUG_FS, DBG_NONE "large_file\n");
182 if (features_ro & EXT4_FRO_COM_BTREE_DIR)
183 ext4_dbg(DEBUG_FS, DBG_NONE "btree_dir\n");
184 if (features_ro & EXT4_FRO_COM_HUGE_FILE)
185 ext4_dbg(DEBUG_FS, DBG_NONE "huge_file\n");
186 if (features_ro & EXT4_FRO_COM_GDT_CSUM)
187 ext4_dbg(DEBUG_FS, DBG_NONE "gtd_csum\n");
188 if (features_ro & EXT4_FRO_COM_DIR_NLINK)
189 ext4_dbg(DEBUG_FS, DBG_NONE "dir_nlink\n");
190 if (features_ro & EXT4_FRO_COM_EXTRA_ISIZE)
191 ext4_dbg(DEBUG_FS, DBG_NONE "extra_isize\n");
192 if (features_ro & EXT4_FRO_COM_QUOTA)
193 ext4_dbg(DEBUG_FS, DBG_NONE "quota\n");
194 if (features_ro & EXT4_FRO_COM_BIGALLOC)
195 ext4_dbg(DEBUG_FS, DBG_NONE "bigalloc\n");
196 if (features_ro & EXT4_FRO_COM_METADATA_CSUM)
197 ext4_dbg(DEBUG_FS, DBG_NONE "metadata_csum\n");
200 int ext4_fs_check_features(struct ext4_fs *fs, bool *read_only)
202 ext4_assert(fs && read_only);
204 if (ext4_get32(&fs->sb, rev_level) == 0) {
209 ext4_dbg(DEBUG_FS, DBG_INFO "sblock features_incompatible:\n");
210 ext4_fs_debug_features_inc(ext4_get32(&fs->sb, features_incompatible));
212 ext4_dbg(DEBUG_FS, DBG_INFO "sblock features_compatible:\n");
213 ext4_fs_debug_features_comp(ext4_get32(&fs->sb, features_compatible));
215 ext4_dbg(DEBUG_FS, DBG_INFO "sblock features_read_only:\n");
216 ext4_fs_debug_features_ro(ext4_get32(&fs->sb, features_read_only));
218 /*Check features_incompatible*/
219 v = (ext4_get32(&fs->sb, features_incompatible) &
220 (~CONFIG_SUPPORTED_FINCOM));
222 ext4_dbg(DEBUG_FS, DBG_ERROR
223 "sblock has unsupported features incompatible:\n");
224 ext4_fs_debug_features_inc(v);
228 /*Check features_read_only*/
229 v = ext4_get32(&fs->sb, features_read_only);
230 v &= ~CONFIG_SUPPORTED_FRO_COM;
232 ext4_dbg(DEBUG_FS, DBG_WARN
233 "sblock has unsupported features read only:\n");
234 ext4_fs_debug_features_ro(v);
243 /**@brief Determine whether the block is inside the group.
244 * @param baddr block address
245 * @param bgid block group id
248 static bool ext4_block_in_group(struct ext4_sblock *s, ext4_fsblk_t baddr,
251 uint32_t actual_bgid;
252 actual_bgid = ext4_balloc_get_bgid_of_block(s, baddr);
253 if (actual_bgid == bgid)
258 /**@brief To avoid calling the atomic setbit hundreds or thousands of times, we only
259 * need to use it within a single byte (to ensure we get endianness right).
260 * We can use memset for the rest of the bitmap as there are no other users.
262 static void ext4_fs_mark_bitmap_end(int start_bit, int end_bit, void *bitmap)
266 if (start_bit >= end_bit)
269 for (i = start_bit; (unsigned)i < ((start_bit + 7) & ~7UL); i++)
270 ext4_bmap_bit_set(bitmap, i);
273 memset((char *)bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
276 /**@brief Initialize block bitmap in block group.
277 * @param bg_ref Reference to block group
280 static int ext4_fs_init_block_bitmap(struct ext4_block_group_ref *bg_ref)
282 struct ext4_sblock *sb = &bg_ref->fs->sb;
283 struct ext4_bgroup *bg = bg_ref->block_group;
286 uint32_t i, bit, bit_max;
287 uint32_t group_blocks;
288 uint16_t inode_size = ext4_get16(sb, inode_size);
289 uint32_t block_size = ext4_sb_get_block_size(sb);
290 uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
292 ext4_fsblk_t bmp_blk = ext4_bg_get_block_bitmap(bg, sb);
293 ext4_fsblk_t bmp_inode = ext4_bg_get_inode_bitmap(bg, sb);
294 ext4_fsblk_t inode_table = ext4_bg_get_inode_table_first_block(bg, sb);
295 ext4_fsblk_t first_bg = ext4_balloc_get_block_of_bgid(sb, bg_ref->index);
297 uint32_t dsc_per_block = block_size / ext4_sb_get_desc_size(sb);
299 bool flex_bg = ext4_sb_feature_incom(sb, EXT4_FINCOM_FLEX_BG);
300 bool meta_bg = ext4_sb_feature_incom(sb, EXT4_FINCOM_META_BG);
302 uint32_t inode_table_bcnt = inodes_per_group * inode_size / block_size;
304 struct ext4_block block_bitmap;
305 rc = ext4_block_get_noread(bg_ref->fs->bdev, &block_bitmap, bmp_blk);
309 memset(block_bitmap.data, 0, block_size);
310 bit_max = ext4_sb_is_super_in_bg(sb, bg_ref->index);
312 uint32_t count = ext4_sb_first_meta_bg(sb) * dsc_per_block;
313 if (!meta_bg || bg_ref->index < count) {
315 bit_max += ext4_bg_num_gdb(sb, bg_ref->index);
316 bit_max += ext4_get16(sb, s_reserved_gdt_blocks);
318 } else { /* For META_BG_BLOCK_GROUPS */
319 bit_max += ext4_bg_num_gdb(sb, bg_ref->index);
321 for (bit = 0; bit < bit_max; bit++)
322 ext4_bmap_bit_set(block_bitmap.data, bit);
324 if (bg_ref->index == ext4_block_group_cnt(sb) - 1) {
326 * Even though mke2fs always initialize first and last group
327 * if some other tool enabled the EXT4_BG_BLOCK_UNINIT we need
328 * to make sure we calculate the right free blocks
331 group_blocks = ext4_sb_get_blocks_cnt(sb);
332 group_blocks -= ext4_get32(sb, first_data_block);
333 group_blocks -= ext4_get32(sb, blocks_per_group) *
334 (ext4_block_group_cnt(sb) - 1);
336 group_blocks = ext4_get32(sb, blocks_per_group);
340 in_bg = ext4_block_in_group(sb, bmp_blk, bg_ref->index);
341 if (!flex_bg || in_bg)
342 ext4_bmap_bit_set(block_bitmap.data, bmp_blk - first_bg);
344 in_bg = ext4_block_in_group(sb, bmp_inode, bg_ref->index);
345 if (!flex_bg || in_bg)
346 ext4_bmap_bit_set(block_bitmap.data, bmp_inode - first_bg);
348 for (i = inode_table; i < inode_table + inode_table_bcnt; i++) {
349 in_bg = ext4_block_in_group(sb, i, bg_ref->index);
350 if (!flex_bg || in_bg)
351 ext4_bmap_bit_set(block_bitmap.data, i - first_bg);
354 * Also if the number of blocks within the group is
355 * less than the blocksize * 8 ( which is the size
356 * of bitmap ), set rest of the block bitmap to 1
358 ext4_fs_mark_bitmap_end(group_blocks, block_size * 8, block_bitmap.data);
359 block_bitmap.dirty = true;
361 ext4_balloc_set_bitmap_csum(sb, bg_ref->block_group, block_bitmap.data);
362 bg_ref->dirty = true;
365 return ext4_block_set(bg_ref->fs->bdev, &block_bitmap);
368 /**@brief Initialize i-node bitmap in block group.
369 * @param bg_ref Reference to block group
372 static int ext4_fs_init_inode_bitmap(struct ext4_block_group_ref *bg_ref)
375 struct ext4_sblock *sb = &bg_ref->fs->sb;
376 struct ext4_bgroup *bg = bg_ref->block_group;
379 ext4_fsblk_t bitmap_block_addr = ext4_bg_get_inode_bitmap(bg, sb);
382 rc = ext4_block_get_noread(bg_ref->fs->bdev, &b, bitmap_block_addr);
386 /* Initialize all bitmap bits to zero */
387 uint32_t block_size = ext4_sb_get_block_size(sb);
388 uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
390 memset(b.data, 0, (inodes_per_group + 7) / 8);
392 uint32_t start_bit = inodes_per_group;
393 uint32_t end_bit = block_size * 8;
396 for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++)
397 ext4_bmap_bit_set(b.data, i);
400 memset(b.data + (i >> 3), 0xff, (end_bit - i) >> 3);
404 ext4_ialloc_set_bitmap_csum(sb, bg, b.data);
405 bg_ref->dirty = true;
408 return ext4_block_set(bg_ref->fs->bdev, &b);
411 /**@brief Initialize i-node table in block group.
412 * @param bg_ref Reference to block group
415 static int ext4_fs_init_inode_table(struct ext4_block_group_ref *bg_ref)
417 struct ext4_sblock *sb = &bg_ref->fs->sb;
418 struct ext4_bgroup *bg = bg_ref->block_group;
420 uint32_t inode_size = ext4_get32(sb, inode_size);
421 uint32_t block_size = ext4_sb_get_block_size(sb);
422 uint32_t inodes_per_block = block_size / inode_size;
423 uint32_t inodes_in_group = ext4_inodes_in_group_cnt(sb, bg_ref->index);
424 uint32_t table_blocks = inodes_in_group / inodes_per_block;
427 if (inodes_in_group % inodes_per_block)
430 /* Compute initialization bounds */
431 ext4_fsblk_t first_block = ext4_bg_get_inode_table_first_block(bg, sb);
433 ext4_fsblk_t last_block = first_block + table_blocks - 1;
435 /* Initialization of all itable blocks */
436 for (fblock = first_block; fblock <= last_block; ++fblock) {
438 int rc = ext4_block_get_noread(bg_ref->fs->bdev, &b, fblock);
442 memset(b.data, 0, block_size);
445 ext4_block_set(bg_ref->fs->bdev, &b);
453 static ext4_fsblk_t ext4_fs_get_descriptor_block(struct ext4_sblock *s,
455 uint32_t dsc_per_block)
457 uint32_t first_meta_bg, dsc_id;
459 dsc_id = bgid / dsc_per_block;
460 first_meta_bg = ext4_sb_first_meta_bg(s);
462 bool meta_bg = ext4_sb_feature_incom(s, EXT4_FINCOM_META_BG);
464 if (!meta_bg || dsc_id < first_meta_bg)
465 return ext4_get32(s, first_data_block) + dsc_id + 1;
467 if (ext4_sb_is_super_in_bg(s, bgid))
470 return (has_super + ext4_fs_first_bg_block_no(s, bgid));
473 /**@brief Compute checksum of block group descriptor.
474 * @param sb Superblock
475 * @param bgid Index of block group in the filesystem
476 * @param bg Block group to compute checksum for
477 * @return Checksum value
479 static uint16_t ext4_fs_bg_checksum(struct ext4_sblock *sb, uint32_t bgid,
480 struct ext4_bgroup *bg)
482 /* If checksum not supported, 0 will be returned */
484 #if CONFIG_META_CSUM_ENABLE
485 /* Compute the checksum only if the filesystem supports it */
486 if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
487 /* Use metadata_csum algorithm instead */
488 uint32_t le32_bgid = to_le32(bgid);
489 uint32_t orig_checksum, checksum;
491 /* Preparation: temporarily set bg checksum to 0 */
492 orig_checksum = bg->checksum;
495 /* First calculate crc32 checksum against fs uuid */
496 checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid,
498 /* Then calculate crc32 checksum against bgid */
499 checksum = ext4_crc32c(checksum, &le32_bgid, sizeof(bgid));
500 /* Finally calculate crc32 checksum against block_group_desc */
501 checksum = ext4_crc32c(checksum, bg, ext4_sb_get_desc_size(sb));
502 bg->checksum = orig_checksum;
504 crc = checksum & 0xFFFF;
508 if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_GDT_CSUM)) {
509 uint8_t *base = (uint8_t *)bg;
510 uint8_t *checksum = (uint8_t *)&bg->checksum;
512 uint32_t offset = (uint32_t)(checksum - base);
514 /* Convert block group index to little endian */
515 uint32_t group = to_le32(bgid);
518 crc = ext4_bg_crc16(~0, sb->uuid, sizeof(sb->uuid));
520 /* Include index of block group */
521 crc = ext4_bg_crc16(crc, (uint8_t *)&group, sizeof(group));
523 /* Compute crc from the first part (stop before checksum field)
525 crc = ext4_bg_crc16(crc, (uint8_t *)bg, offset);
528 offset += sizeof(bg->checksum);
530 /* Checksum of the rest of block group descriptor */
531 if ((ext4_sb_feature_incom(sb, EXT4_FINCOM_64BIT)) &&
532 (offset < ext4_sb_get_desc_size(sb))) {
534 const uint8_t *start = ((uint8_t *)bg) + offset;
535 size_t len = ext4_sb_get_desc_size(sb) - offset;
536 crc = ext4_bg_crc16(crc, start, len);
542 #if CONFIG_META_CSUM_ENABLE
543 static bool ext4_fs_verify_bg_csum(struct ext4_sblock *sb,
545 struct ext4_bgroup *bg)
547 if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
550 return ext4_fs_bg_checksum(sb, bgid, bg) == to_le16(bg->checksum);
553 #define ext4_fs_verify_bg_csum(...) true
556 int ext4_fs_get_block_group_ref(struct ext4_fs *fs, uint32_t bgid,
557 struct ext4_block_group_ref *ref)
559 /* Compute number of descriptors, that fits in one data block */
560 uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
561 uint32_t dsc_cnt = block_size / ext4_sb_get_desc_size(&fs->sb);
563 /* Block group descriptor table starts at the next block after
565 uint64_t block_id = ext4_fs_get_descriptor_block(&fs->sb, bgid, dsc_cnt);
567 uint32_t offset = (bgid % dsc_cnt) * ext4_sb_get_desc_size(&fs->sb);
569 int rc = ext4_block_get(fs->bdev, &ref->block, block_id);
573 ref->block_group = (void *)(ref->block.data + offset);
577 struct ext4_bgroup *bg = ref->block_group;
579 if (!ext4_fs_verify_bg_csum(&fs->sb, bgid, bg)) {
581 DBG_WARN "Block group descriptor checksum failed."
582 "Block group index: %" PRIu32"\n",
586 if (ext4_bg_has_flag(bg, EXT4_BLOCK_GROUP_BLOCK_UNINIT)) {
587 rc = ext4_fs_init_block_bitmap(ref);
589 ext4_block_set(fs->bdev, &ref->block);
592 ext4_bg_clear_flag(bg, EXT4_BLOCK_GROUP_BLOCK_UNINIT);
596 if (ext4_bg_has_flag(bg, EXT4_BLOCK_GROUP_INODE_UNINIT)) {
597 rc = ext4_fs_init_inode_bitmap(ref);
599 ext4_block_set(ref->fs->bdev, &ref->block);
603 ext4_bg_clear_flag(bg, EXT4_BLOCK_GROUP_INODE_UNINIT);
605 if (!ext4_bg_has_flag(bg, EXT4_BLOCK_GROUP_ITABLE_ZEROED)) {
606 rc = ext4_fs_init_inode_table(ref);
608 ext4_block_set(fs->bdev, &ref->block);
612 ext4_bg_set_flag(bg, EXT4_BLOCK_GROUP_ITABLE_ZEROED);
621 int ext4_fs_put_block_group_ref(struct ext4_block_group_ref *ref)
623 /* Check if reference modified */
625 /* Compute new checksum of block group */
627 cs = ext4_fs_bg_checksum(&ref->fs->sb, ref->index,
629 ref->block_group->checksum = to_le16(cs);
631 /* Mark block dirty for writing changes to physical device */
632 ref->block.dirty = true;
635 /* Put back block, that contains block group descriptor */
636 return ext4_block_set(ref->fs->bdev, &ref->block);
639 #if CONFIG_META_CSUM_ENABLE
640 static uint32_t ext4_fs_inode_checksum(struct ext4_inode_ref *inode_ref)
642 uint32_t checksum = 0;
643 struct ext4_sblock *sb = &inode_ref->fs->sb;
644 uint16_t inode_size = ext4_get16(sb, inode_size);
646 if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
647 uint32_t orig_checksum;
649 uint32_t ino_index = to_le32(inode_ref->index);
651 to_le32(ext4_inode_get_generation(inode_ref->inode));
653 /* Preparation: temporarily set bg checksum to 0 */
654 orig_checksum = ext4_inode_get_csum(sb, inode_ref->inode);
655 ext4_inode_set_csum(sb, inode_ref->inode, 0);
657 /* First calculate crc32 checksum against fs uuid */
658 checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid,
660 /* Then calculate crc32 checksum against inode number
661 * and inode generation */
662 checksum = ext4_crc32c(checksum, &ino_index, sizeof(ino_index));
663 checksum = ext4_crc32c(checksum, &ino_gen, sizeof(ino_gen));
664 /* Finally calculate crc32 checksum against
665 * the entire inode */
666 checksum = ext4_crc32c(checksum, inode_ref->inode, inode_size);
667 ext4_inode_set_csum(sb, inode_ref->inode, orig_checksum);
669 /* If inode size is not large enough to hold the
670 * upper 16bit of the checksum */
671 if (inode_size == EXT4_GOOD_OLD_INODE_SIZE)
678 #define ext4_fs_inode_checksum(...) 0
681 static void ext4_fs_set_inode_checksum(struct ext4_inode_ref *inode_ref)
683 struct ext4_sblock *sb = &inode_ref->fs->sb;
684 if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
687 uint32_t csum = ext4_fs_inode_checksum(inode_ref);
688 ext4_inode_set_csum(sb, inode_ref->inode, csum);
691 #if CONFIG_META_CSUM_ENABLE
692 static bool ext4_fs_verify_inode_csum(struct ext4_inode_ref *inode_ref)
694 struct ext4_sblock *sb = &inode_ref->fs->sb;
695 if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
698 return ext4_inode_get_csum(sb, inode_ref->inode) ==
699 ext4_fs_inode_checksum(inode_ref);
702 #define ext4_fs_verify_inode_csum(...) true
706 __ext4_fs_get_inode_ref(struct ext4_fs *fs, uint32_t index,
707 struct ext4_inode_ref *ref,
710 /* Compute number of i-nodes, that fits in one data block */
711 uint32_t inodes_per_group = ext4_get32(&fs->sb, inodes_per_group);
714 * Inode numbers are 1-based, but it is simpler to work with 0-based
715 * when computing indices
718 uint32_t block_group = index / inodes_per_group;
719 uint32_t offset_in_group = index % inodes_per_group;
721 /* Load block group, where i-node is located */
722 struct ext4_block_group_ref bg_ref;
724 int rc = ext4_fs_get_block_group_ref(fs, block_group, &bg_ref);
729 /* Load block address, where i-node table is located */
730 uint32_t inode_table_start =
731 ext4_bg_get_inode_table_first_block(bg_ref.block_group, &fs->sb);
733 /* Put back block group reference (not needed more) */
734 rc = ext4_fs_put_block_group_ref(&bg_ref);
739 /* Compute position of i-node in the block group */
740 uint16_t inode_size = ext4_get16(&fs->sb, inode_size);
741 uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
742 uint32_t byte_offset_in_group = offset_in_group * inode_size;
744 /* Compute block address */
745 ext4_fsblk_t block_id =
746 inode_table_start + (byte_offset_in_group / block_size);
748 rc = ext4_block_get(fs->bdev, &ref->block, block_id);
753 /* Compute position of i-node in the data block */
754 uint32_t offset_in_block = byte_offset_in_group % block_size;
755 ref->inode = (struct ext4_inode *)(ref->block.data + offset_in_block);
757 /* We need to store the original value of index in the reference */
758 ref->index = index + 1;
762 if (initialized && !ext4_fs_verify_inode_csum(ref)) {
764 DBG_WARN "Inode checksum failed."
765 "Inode: %" PRIu32"\n",
772 int ext4_fs_get_inode_ref(struct ext4_fs *fs, uint32_t index,
773 struct ext4_inode_ref *ref)
775 return __ext4_fs_get_inode_ref(fs, index, ref, true);
778 int ext4_fs_put_inode_ref(struct ext4_inode_ref *ref)
780 /* Check if reference modified */
782 /* Mark block dirty for writing changes to physical device */
783 ext4_fs_set_inode_checksum(ref);
784 ref->block.dirty = true;
787 /* Put back block, that contains i-node */
788 return ext4_block_set(ref->fs->bdev, &ref->block);
791 void ext4_fs_inode_blocks_init(struct ext4_fs *fs,
792 struct ext4_inode_ref *inode_ref)
795 struct ext4_inode *inode = inode_ref->inode;
797 for (i = 0; i < EXT4_INODE_BLOCKS; i++)
798 inode->blocks[i] = 0;
801 #if CONFIG_EXTENT_ENABLE
802 /* Initialize extents if needed */
803 if (ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS)) {
804 ext4_inode_set_flag(inode, EXT4_INODE_FLAG_EXTENTS);
806 /* Initialize extent root header */
807 ext4_extent_tree_init(inode_ref);
812 uint32_t ext4_fs_correspond_inode_mode(int filetype)
816 return EXT4_INODE_MODE_DIRECTORY;
817 case EXT4_DE_REG_FILE:
818 return EXT4_INODE_MODE_FILE;
819 case EXT4_DE_SYMLINK:
820 return EXT4_INODE_MODE_SOFTLINK;
822 /* FIXME: right now we only support 3 file type. */
828 int ext4_fs_alloc_inode(struct ext4_fs *fs, struct ext4_inode_ref *inode_ref,
831 /* Check if newly allocated i-node will be a directory */
833 uint16_t inode_size = ext4_get16(&fs->sb, inode_size);
835 is_dir = (filetype == EXT4_DE_DIR);
837 /* Allocate inode by allocation algorithm */
839 int rc = ext4_ialloc_alloc_inode(fs, &index, is_dir);
843 /* Load i-node from on-disk i-node table */
844 rc = __ext4_fs_get_inode_ref(fs, index, inode_ref, false);
846 ext4_ialloc_free_inode(fs, index, is_dir);
850 /* Initialize i-node */
851 struct ext4_inode *inode = inode_ref->inode;
856 * Default directory permissions to be compatible with other
858 * 0777 (octal) == rwxrwxrwx
862 mode |= EXT4_INODE_MODE_DIRECTORY;
865 * Default file permissions to be compatible with other systems
866 * 0666 (octal) == rw-rw-rw-
870 mode |= ext4_fs_correspond_inode_mode(filetype);
872 ext4_inode_set_mode(&fs->sb, inode, mode);
874 ext4_inode_set_links_cnt(inode, 0);
875 ext4_inode_set_uid(inode, 0);
876 ext4_inode_set_gid(inode, 0);
877 ext4_inode_set_size(inode, 0);
878 ext4_inode_set_access_time(inode, 0);
879 ext4_inode_set_change_inode_time(inode, 0);
880 ext4_inode_set_modif_time(inode, 0);
881 ext4_inode_set_del_time(inode, 0);
882 ext4_inode_set_blocks_count(&fs->sb, inode, 0);
883 ext4_inode_set_flags(inode, 0);
884 ext4_inode_set_generation(inode, 0);
885 if (inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
886 uint16_t off = offsetof(struct ext4_inode, extra_isize);
887 uint16_t size = sizeof(struct ext4_inode) - off;
888 ext4_inode_set_extra_isize(inode, size);
891 /* Reset blocks array. For symbolic link inode, just
892 * fill in blocks with 0 */
893 if (ext4_inode_is_type(&fs->sb, inode, EXT4_INODE_MODE_SOFTLINK)) {
894 for (int i = 0; i < EXT4_INODE_BLOCKS; i++)
895 inode->blocks[i] = 0;
898 ext4_fs_inode_blocks_init(fs, inode_ref);
901 inode_ref->dirty = true;
906 int ext4_fs_free_inode(struct ext4_inode_ref *inode_ref)
908 struct ext4_fs *fs = inode_ref->fs;
912 #if CONFIG_EXTENT_ENABLE
913 /* For extents must be data block destroyed by other way */
914 if ((ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS)) &&
915 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
916 /* Data structures are released during truncate operation... */
920 /* Release all indirect (no data) blocks */
922 /* 1) Single indirect */
923 ext4_fsblk_t fblock = ext4_inode_get_indirect_block(inode_ref->inode, 0);
925 int rc = ext4_balloc_free_block(inode_ref, fblock);
929 ext4_inode_set_indirect_block(inode_ref->inode, 0, 0);
932 uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
933 uint32_t count = block_size / sizeof(uint32_t);
935 struct ext4_block block;
937 /* 2) Double indirect */
938 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 1);
940 int rc = ext4_block_get(fs->bdev, &block, fblock);
944 ext4_fsblk_t ind_block;
945 for (offset = 0; offset < count; ++offset) {
946 ind_block = to_le32(((uint32_t *)block.data)[offset]);
950 rc = ext4_balloc_free_block(inode_ref, ind_block);
952 ext4_block_set(fs->bdev, &block);
958 ext4_block_set(fs->bdev, &block);
959 rc = ext4_balloc_free_block(inode_ref, fblock);
963 ext4_inode_set_indirect_block(inode_ref->inode, 1, 0);
966 /* 3) Tripple indirect */
967 struct ext4_block subblock;
968 fblock = ext4_inode_get_indirect_block(inode_ref->inode, 2);
971 rc = ext4_block_get(fs->bdev, &block, fblock);
975 ext4_fsblk_t ind_block;
976 for (offset = 0; offset < count; ++offset) {
977 ind_block = to_le32(((uint32_t *)block.data)[offset]);
981 rc = ext4_block_get(fs->bdev, &subblock,
984 ext4_block_set(fs->bdev, &block);
988 ext4_fsblk_t ind_subblk;
989 for (suboff = 0; suboff < count; ++suboff) {
990 ind_subblk = to_le32(((uint32_t *)subblock.data)[suboff]);
994 rc = ext4_balloc_free_block(inode_ref, ind_subblk);
996 ext4_block_set(fs->bdev, &subblock);
997 ext4_block_set(fs->bdev, &block);
1003 ext4_block_set(fs->bdev, &subblock);
1005 rc = ext4_balloc_free_block(inode_ref,
1008 ext4_block_set(fs->bdev, &block);
1014 ext4_block_set(fs->bdev, &block);
1015 rc = ext4_balloc_free_block(inode_ref, fblock);
1019 ext4_inode_set_indirect_block(inode_ref->inode, 2, 0);
1021 /* Mark inode dirty for writing to the physical device */
1022 inode_ref->dirty = true;
1024 /* Free block with extended attributes if present */
1025 ext4_fsblk_t xattr_block =
1026 ext4_inode_get_file_acl(inode_ref->inode, &fs->sb);
1028 int rc = ext4_balloc_free_block(inode_ref, xattr_block);
1032 ext4_inode_set_file_acl(inode_ref->inode, &fs->sb, 0);
1035 /* Free inode by allocator */
1036 if (ext4_inode_is_type(&fs->sb, inode_ref->inode,
1037 EXT4_INODE_MODE_DIRECTORY))
1038 rc = ext4_ialloc_free_inode(fs, inode_ref->index, true);
1040 rc = ext4_ialloc_free_inode(fs, inode_ref->index, false);
1046 /**@brief Release data block from i-node
1047 * @param inode_ref I-node to release block from
1048 * @param iblock Logical block to be released
1049 * @return Error code
1051 static int ext4_fs_release_inode_block(struct ext4_inode_ref *inode_ref,
1054 ext4_fsblk_t fblock;
1056 struct ext4_fs *fs = inode_ref->fs;
1058 /* Extents are handled otherwise = there is not support in this function
1061 ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS) &&
1062 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))));
1064 struct ext4_inode *inode = inode_ref->inode;
1066 /* Handle simple case when we are dealing with direct reference */
1067 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
1068 fblock = ext4_inode_get_direct_block(inode, iblock);
1074 ext4_inode_set_direct_block(inode, iblock, 0);
1075 return ext4_balloc_free_block(inode_ref, fblock);
1078 /* Determine the indirection level needed to get the desired block */
1079 unsigned int level = 0;
1081 for (i = 1; i < 4; i++) {
1082 if (iblock < fs->inode_block_limits[i]) {
1091 /* Compute offsets for the topmost level */
1092 uint64_t block_offset_in_level =
1093 iblock - fs->inode_block_limits[level - 1];
1094 ext4_fsblk_t current_block =
1095 ext4_inode_get_indirect_block(inode, level - 1);
1096 uint32_t offset_in_block =
1097 block_offset_in_level / fs->inode_blocks_per_level[level - 1];
1100 * Navigate through other levels, until we find the block number
1101 * or find null reference meaning we are dealing with sparse file
1103 struct ext4_block block;
1108 if (current_block == 0)
1111 int rc = ext4_block_get(fs->bdev, &block, current_block);
1116 to_le32(((uint32_t *)block.data)[offset_in_block]);
1118 /* Set zero if physical data block address found */
1120 ((uint32_t *)block.data)[offset_in_block] = to_le32(0);
1124 rc = ext4_block_set(fs->bdev, &block);
1131 * If we are on the last level, break here as
1132 * there is no next level to visit
1137 /* Visit the next level */
1138 block_offset_in_level %= fs->inode_blocks_per_level[level];
1139 offset_in_block = block_offset_in_level /
1140 fs->inode_blocks_per_level[level - 1];
1143 fblock = current_block;
1147 /* Physical block is not referenced, it can be released */
1148 return ext4_balloc_free_block(inode_ref, fblock);
1151 int ext4_fs_truncate_inode(struct ext4_inode_ref *inode_ref, uint64_t new_size)
1153 struct ext4_sblock *sb = &inode_ref->fs->sb;
1157 /* Check flags, if i-node can be truncated */
1158 if (!ext4_inode_can_truncate(sb, inode_ref->inode))
1161 /* If sizes are equal, nothing has to be done. */
1162 uint64_t old_size = ext4_inode_get_size(sb, inode_ref->inode);
1163 if (old_size == new_size)
1166 /* It's not supported to make the larger file by truncate operation */
1167 if (old_size < new_size)
1171 v = ext4_inode_is_type(sb, inode_ref->inode, EXT4_INODE_MODE_SOFTLINK);
1172 if (v && old_size < sizeof(inode_ref->inode->blocks) &&
1173 !ext4_inode_get_blocks_count(sb, inode_ref->inode)) {
1174 char *content = (char *)inode_ref->inode->blocks + new_size;
1175 memset(content , 0, sizeof(inode_ref->inode->blocks) - new_size);
1176 ext4_inode_set_size(inode_ref->inode, new_size);
1177 inode_ref->dirty = true;
1182 /* Compute how many blocks will be released */
1183 uint32_t block_size = ext4_sb_get_block_size(sb);
1184 uint32_t new_blocks_cnt = (new_size + block_size - 1) / block_size;
1185 uint32_t old_blocks_cnt = (old_size + block_size - 1) / block_size;
1186 uint32_t diff_blocks_cnt = old_blocks_cnt - new_blocks_cnt;
1187 #if CONFIG_EXTENT_ENABLE
1188 if ((ext4_sb_feature_incom(sb, EXT4_FINCOM_EXTENTS)) &&
1189 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
1191 /* Extents require special operation */
1192 if (diff_blocks_cnt) {
1193 r = ext4_extent_remove_space(inode_ref, new_blocks_cnt,
1202 /* Release data blocks from the end of file */
1204 /* Starting from 1 because of logical blocks are numbered from 0
1206 for (i = 0; i < diff_blocks_cnt; ++i) {
1207 r = ext4_fs_release_inode_block(inode_ref,
1208 new_blocks_cnt + i);
1215 ext4_inode_set_size(inode_ref->inode, new_size);
1216 inode_ref->dirty = true;
1221 /**@brief Compute 'goal' for inode index
1222 * @param inode_ref Reference to inode, to allocate block for
1225 ext4_fsblk_t ext4_fs_inode_to_goal_block(struct ext4_inode_ref *inode_ref)
1227 uint32_t grp_inodes = ext4_get32(&inode_ref->fs->sb, inodes_per_group);
1228 return (inode_ref->index - 1) / grp_inodes;
1231 /**@brief Compute 'goal' for allocation algorithm (For blockmap).
1232 * @param inode_ref Reference to inode, to allocate block for
1234 * @return error code
1236 int ext4_fs_indirect_find_goal(struct ext4_inode_ref *inode_ref,
1240 struct ext4_sblock *sb = &inode_ref->fs->sb;
1243 uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
1244 uint32_t block_size = ext4_sb_get_block_size(sb);
1245 uint32_t iblock_cnt = inode_size / block_size;
1247 if (inode_size % block_size != 0)
1250 /* If inode has some blocks, get last block address + 1 */
1251 if (iblock_cnt > 0) {
1252 r = ext4_fs_get_inode_data_block_index(inode_ref, iblock_cnt - 1,
1262 /* If goal == 0, sparse file -> continue */
1265 /* Identify block group of inode */
1267 uint32_t inodes_per_bg = ext4_get32(sb, inodes_per_group);
1268 uint32_t block_group = (inode_ref->index - 1) / inodes_per_bg;
1269 block_size = ext4_sb_get_block_size(sb);
1271 /* Load block group reference */
1272 struct ext4_block_group_ref bg_ref;
1273 r = ext4_fs_get_block_group_ref(inode_ref->fs, block_group, &bg_ref);
1277 struct ext4_bgroup *bg = bg_ref.block_group;
1279 /* Compute indexes */
1280 uint32_t bg_count = ext4_block_group_cnt(sb);
1281 ext4_fsblk_t itab_first_block = ext4_bg_get_inode_table_first_block(bg, sb);
1282 uint16_t itab_item_size = ext4_get16(sb, inode_size);
1283 uint32_t itab_bytes;
1285 /* Check for last block group */
1286 if (block_group < bg_count - 1) {
1287 itab_bytes = inodes_per_bg * itab_item_size;
1289 /* Last block group could be smaller */
1290 uint32_t inodes_cnt = ext4_get32(sb, inodes_count);
1292 itab_bytes = (inodes_cnt - ((bg_count - 1) * inodes_per_bg));
1293 itab_bytes *= itab_item_size;
1296 ext4_fsblk_t inode_table_blocks = itab_bytes / block_size;
1298 if (itab_bytes % block_size)
1299 inode_table_blocks++;
1301 *goal = itab_first_block + inode_table_blocks;
1303 return ext4_fs_put_block_group_ref(&bg_ref);
1306 static int ext4_fs_get_inode_data_block_idx(struct ext4_inode_ref *inode_ref,
1307 uint64_t iblock, ext4_fsblk_t *fblock,
1309 bool support_unwritten __unused)
1311 struct ext4_fs *fs = inode_ref->fs;
1313 /* For empty file is situation simple */
1314 if (ext4_inode_get_size(&fs->sb, inode_ref->inode) == 0) {
1319 ext4_fsblk_t current_block;
1321 (void)extent_create;
1322 #if CONFIG_EXTENT_ENABLE
1323 /* Handle i-node using extents */
1324 if ((ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS)) &&
1325 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
1327 ext4_fsblk_t current_fsblk;
1328 int rc = ext4_extent_get_blocks(inode_ref, iblock, 1,
1329 ¤t_fsblk, extent_create, NULL);
1333 current_block = current_fsblk;
1334 *fblock = current_block;
1336 ext4_assert(*fblock || support_unwritten);
1341 struct ext4_inode *inode = inode_ref->inode;
1343 /* Direct block are read directly from array in i-node structure */
1344 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
1346 ext4_inode_get_direct_block(inode, (uint32_t)iblock);
1347 *fblock = current_block;
1351 /* Determine indirection level of the target block */
1354 for (i = 1; i < 4; i++) {
1355 if (iblock < fs->inode_block_limits[i]) {
1364 /* Compute offsets for the topmost level */
1365 uint64_t blk_off_in_lvl = iblock - fs->inode_block_limits[l - 1];
1366 current_block = ext4_inode_get_indirect_block(inode, l - 1);
1367 uint32_t off_in_blk = blk_off_in_lvl / fs->inode_blocks_per_level[l - 1];
1370 if (current_block == 0) {
1375 struct ext4_block block;
1378 * Navigate through other levels, until we find the block number
1379 * or find null reference meaning we are dealing with sparse file
1382 /* Load indirect block */
1383 int rc = ext4_block_get(fs->bdev, &block, current_block);
1387 /* Read block address from indirect block */
1389 to_le32(((uint32_t *)block.data)[off_in_blk]);
1391 /* Put back indirect block untouched */
1392 rc = ext4_block_set(fs->bdev, &block);
1396 /* Check for sparse file */
1397 if (current_block == 0) {
1402 /* Jump to the next level */
1405 /* Termination condition - we have address of data block loaded
1410 /* Visit the next level */
1411 blk_off_in_lvl %= fs->inode_blocks_per_level[l];
1412 off_in_blk = blk_off_in_lvl / fs->inode_blocks_per_level[l - 1];
1415 *fblock = current_block;
1421 int ext4_fs_get_inode_data_block_index(struct ext4_inode_ref *inode_ref,
1422 uint64_t iblock, ext4_fsblk_t *fblock,
1423 bool support_unwritten)
1425 return ext4_fs_get_inode_data_block_idx(inode_ref, iblock, fblock,
1426 false, support_unwritten);
1429 int ext4_fs_init_inode_data_block_index(struct ext4_inode_ref *inode_ref,
1430 uint64_t iblock, ext4_fsblk_t *fblock)
1432 return ext4_fs_get_inode_data_block_idx(inode_ref, iblock, fblock,
1436 static int ext4_fs_set_inode_data_block_index(struct ext4_inode_ref *inode_ref,
1437 uint64_t iblock, ext4_fsblk_t fblock)
1439 struct ext4_fs *fs = inode_ref->fs;
1441 #if CONFIG_EXTENT_ENABLE
1442 /* Handle inode using extents */
1443 if ((ext4_sb_feature_incom(&fs->sb, EXT4_FINCOM_EXTENTS)) &&
1444 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
1450 /* Handle simple case when we are dealing with direct reference */
1451 if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
1452 ext4_inode_set_direct_block(inode_ref->inode, (uint32_t)iblock,
1454 inode_ref->dirty = true;
1459 /* Determine the indirection level needed to get the desired block */
1462 for (i = 1; i < 4; i++) {
1463 if (iblock < fs->inode_block_limits[i]) {
1472 uint32_t block_size = ext4_sb_get_block_size(&fs->sb);
1474 /* Compute offsets for the topmost level */
1475 uint64_t blk_off_in_lvl = iblock - fs->inode_block_limits[l - 1];
1476 ext4_fsblk_t current_block =
1477 ext4_inode_get_indirect_block(inode_ref->inode, l - 1);
1478 uint32_t off_in_blk = blk_off_in_lvl / fs->inode_blocks_per_level[l - 1];
1480 ext4_fsblk_t new_blk;
1482 struct ext4_block block;
1483 struct ext4_block new_block;
1485 /* Is needed to allocate indirect block on the i-node level */
1486 if (current_block == 0) {
1487 /* Allocate new indirect block */
1489 int rc = ext4_fs_indirect_find_goal(inode_ref, &goal);
1493 rc = ext4_balloc_alloc_block(inode_ref, goal, &new_blk);
1498 ext4_inode_set_indirect_block(inode_ref->inode, l - 1, new_blk);
1499 inode_ref->dirty = true;
1501 /* Load newly allocated block */
1502 rc = ext4_block_get_noread(fs->bdev, &new_block, new_blk);
1504 ext4_balloc_free_block(inode_ref, new_blk);
1508 /* Initialize new block */
1509 memset(new_block.data, 0, block_size);
1510 new_block.dirty = true;
1512 /* Put back the allocated block */
1513 rc = ext4_block_set(fs->bdev, &new_block);
1517 current_block = new_blk;
1521 * Navigate through other levels, until we find the block number
1522 * or find null reference meaning we are dealing with sparse file
1525 int rc = ext4_block_get(fs->bdev, &block, current_block);
1529 current_block = to_le32(((uint32_t *)block.data)[off_in_blk]);
1530 if ((l > 1) && (current_block == 0)) {
1532 rc = ext4_fs_indirect_find_goal(inode_ref, &goal);
1534 ext4_block_set(fs->bdev, &block);
1538 /* Allocate new block */
1540 ext4_balloc_alloc_block(inode_ref, goal, &new_blk);
1542 ext4_block_set(fs->bdev, &block);
1546 /* Load newly allocated block */
1547 rc = ext4_block_get_noread(fs->bdev, &new_block,
1551 ext4_block_set(fs->bdev, &block);
1555 /* Initialize allocated block */
1556 memset(new_block.data, 0, block_size);
1557 new_block.dirty = true;
1559 rc = ext4_block_set(fs->bdev, &new_block);
1561 ext4_block_set(fs->bdev, &block);
1565 /* Write block address to the parent */
1566 uint32_t * p = (uint32_t * )block.data;
1567 p[off_in_blk] = to_le32((uint32_t)new_blk);
1569 current_block = new_blk;
1572 /* Will be finished, write the fblock address */
1574 uint32_t * p = (uint32_t * )block.data;
1575 p[off_in_blk] = to_le32((uint32_t)fblock);
1579 rc = ext4_block_set(fs->bdev, &block);
1586 * If we are on the last level, break here as
1587 * there is no next level to visit
1592 /* Visit the next level */
1593 blk_off_in_lvl %= fs->inode_blocks_per_level[l];
1594 off_in_blk = blk_off_in_lvl / fs->inode_blocks_per_level[l - 1];
1601 int ext4_fs_append_inode_block(struct ext4_inode_ref *inode_ref,
1602 ext4_fsblk_t *fblock, uint32_t *iblock)
1604 #if CONFIG_EXTENT_ENABLE
1605 /* Handle extents separately */
1606 if ((ext4_sb_feature_incom(&inode_ref->fs->sb, EXT4_FINCOM_EXTENTS)) &&
1607 (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
1609 ext4_fsblk_t current_fsblk;
1610 struct ext4_sblock *sb = &inode_ref->fs->sb;
1611 uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
1612 uint32_t block_size = ext4_sb_get_block_size(sb);
1613 *iblock = (inode_size + block_size - 1) / block_size;
1615 rc = ext4_extent_get_blocks(inode_ref, *iblock, 1,
1616 ¤t_fsblk, true, NULL);
1619 *fblock = current_fsblk;
1620 ext4_assert(*fblock);
1622 ext4_inode_set_size(inode_ref->inode, inode_size + block_size);
1623 inode_ref->dirty = true;
1629 struct ext4_sblock *sb = &inode_ref->fs->sb;
1631 /* Compute next block index and allocate data block */
1632 uint64_t inode_size = ext4_inode_get_size(sb, inode_ref->inode);
1633 uint32_t block_size = ext4_sb_get_block_size(sb);
1635 /* Align size i-node size */
1636 if ((inode_size % block_size) != 0)
1637 inode_size += block_size - (inode_size % block_size);
1639 /* Logical blocks are numbered from 0 */
1640 uint32_t new_block_idx = inode_size / block_size;
1642 /* Allocate new physical block */
1643 ext4_fsblk_t goal, phys_block;
1644 int rc = ext4_fs_indirect_find_goal(inode_ref, &goal);
1648 rc = ext4_balloc_alloc_block(inode_ref, goal, &phys_block);
1652 /* Add physical block address to the i-node */
1653 rc = ext4_fs_set_inode_data_block_index(inode_ref, new_block_idx,
1656 ext4_balloc_free_block(inode_ref, phys_block);
1661 ext4_inode_set_size(inode_ref->inode, inode_size + block_size);
1662 inode_ref->dirty = true;
1664 *fblock = phys_block;
1665 *iblock = new_block_idx;
1670 void ext4_fs_inode_links_count_inc(struct ext4_inode_ref *inode_ref)
1674 link = ext4_inode_get_links_cnt(inode_ref->inode);
1676 ext4_inode_set_links_cnt(inode_ref->inode, link);
1678 is_dx = ext4_sb_feature_com(&inode_ref->fs->sb, EXT4_FCOM_DIR_INDEX) &&
1679 ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_INDEX);
1681 if (is_dx && link > 1) {
1682 if (link >= EXT4_LINK_MAX || link == 2) {
1683 ext4_inode_set_links_cnt(inode_ref->inode, 1);
1686 v = ext4_get32(&inode_ref->fs->sb, features_read_only);
1687 v |= EXT4_FRO_COM_DIR_NLINK;
1688 ext4_set32(&inode_ref->fs->sb, features_read_only, v);
1693 void ext4_fs_inode_links_count_dec(struct ext4_inode_ref *inode_ref)
1695 uint16_t links = ext4_inode_get_links_cnt(inode_ref->inode);
1696 if (!ext4_inode_is_type(&inode_ref->fs->sb, inode_ref->inode,
1697 EXT4_INODE_MODE_DIRECTORY)) {
1699 ext4_inode_set_links_cnt(inode_ref->inode, links - 1);
1704 ext4_inode_set_links_cnt(inode_ref->inode, links - 1);