2 * (C) Copyright 2011 - 2012 Samsung Electronics
3 * EXT4 filesystem implementation in Uboot by
4 * Uma Shankar <uma.shankar@samsung.com>
5 * Manjunatha C Achar <a.manjunatha@samsung.com>
7 * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
10 * esd gmbh <www.esd-electronics.com>
11 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
13 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
14 * GRUB -- GRand Unified Bootloader
15 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
17 * ext4write : Based on generic ext4 protocol.
19 * SPDX-License-Identifier: GPL-2.0+
23 #include <ext_common.h>
29 #include <linux/stat.h>
30 #include <linux/time.h>
31 #include <asm/byteorder.h>
32 #include "ext4_common.h"
34 struct ext2_data *ext4fs_root;
35 struct ext2fs_node *ext4fs_file;
36 __le32 *ext4fs_indir1_block;
37 int ext4fs_indir1_size;
38 int ext4fs_indir1_blkno = -1;
39 __le32 *ext4fs_indir2_block;
40 int ext4fs_indir2_size;
41 int ext4fs_indir2_blkno = -1;
43 __le32 *ext4fs_indir3_block;
44 int ext4fs_indir3_size;
45 int ext4fs_indir3_blkno = -1;
46 struct ext2_inode *g_parent_inode;
47 static int symlinknest;
49 #if defined(CONFIG_EXT4_WRITE)
50 struct ext2_block_group *ext4fs_get_group_descriptor
51 (const struct ext_filesystem *fs, uint32_t bg_idx)
53 return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
56 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
58 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
61 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
63 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
64 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
67 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
68 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
71 static inline void ext4fs_bg_free_inodes_dec
72 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
74 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
76 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
79 bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
81 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
84 static inline void ext4fs_bg_free_blocks_dec
85 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
87 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
89 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
92 bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
94 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
97 static inline void ext4fs_bg_itable_unused_dec
98 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
100 uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
101 if (fs->gdsize == 64)
102 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
105 bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
106 if (fs->gdsize == 64)
107 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
110 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
112 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
113 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
117 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
119 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
120 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
123 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
124 const struct ext_filesystem *fs)
126 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
127 if (fs->gdsize == 64)
128 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
133 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
134 const struct ext_filesystem *fs)
136 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
137 if (fs->gdsize == 64)
138 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
142 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
144 return le16_to_cpu(bg->bg_flags);
147 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
150 bg->bg_flags = cpu_to_le16(flags);
153 /* Block number of the block bitmap */
154 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
155 const struct ext_filesystem *fs)
157 uint64_t block_nr = le32_to_cpu(bg->block_id);
158 if (fs->gdsize == 64)
159 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
163 /* Block number of the inode bitmap */
164 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
165 const struct ext_filesystem *fs)
167 uint64_t block_nr = le32_to_cpu(bg->inode_id);
168 if (fs->gdsize == 64)
169 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
174 /* Block number of the inode table */
175 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
176 const struct ext_filesystem *fs)
178 uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
179 if (fs->gdsize == 64)
181 (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
185 #if defined(CONFIG_EXT4_WRITE)
186 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
188 uint32_t res = size / n;
195 void put_ext4(uint64_t off, void *buf, uint32_t size)
199 unsigned char *temp_ptr = NULL;
200 struct ext_filesystem *fs = get_fs();
201 int log2blksz = fs->dev_desc->log2blksz;
202 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
204 startblock = off >> log2blksz;
205 startblock += part_offset;
206 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
208 if (fs->dev_desc == NULL)
211 if ((startblock + (size >> log2blksz)) >
212 (part_offset + fs->total_sect)) {
213 printf("part_offset is " LBAFU "\n", part_offset);
214 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
215 printf("error: overflow occurs\n");
220 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
222 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
223 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
225 if (size >> log2blksz != 0) {
226 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
227 (unsigned long *)buf);
229 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
231 memcpy(temp_ptr, buf, size);
232 blk_dwrite(fs->dev_desc, startblock, 1,
233 (unsigned long *)sec_buf);
238 static int _get_new_inode_no(unsigned char *buffer)
240 struct ext_filesystem *fs = get_fs();
246 /* get the blocksize of the filesystem */
247 unsigned char *ptr = buffer;
248 while (*ptr == 255) {
251 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
255 for (j = 0; j < fs->blksz; j++) {
260 status = input & operand;
275 static int _get_new_blk_no(unsigned char *buffer)
280 unsigned char *ptr = buffer;
281 struct ext_filesystem *fs = get_fs();
283 while (*ptr == 255) {
286 if (count == (fs->blksz * 8))
290 if (fs->blksz == 1024)
293 for (i = 0; i <= 7; i++) {
295 if (*ptr & operand) {
306 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
308 int i, remainder, status;
309 unsigned char *ptr = buffer;
310 unsigned char operand;
312 remainder = blockno % 8;
313 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
315 i = i - (index * blocksize);
316 if (blocksize != 1024) {
318 operand = 1 << remainder;
319 status = *ptr & operand;
323 *ptr = *ptr | operand;
326 if (remainder == 0) {
331 operand = (1 << (remainder - 1));
333 status = *ptr & operand;
337 *ptr = *ptr | operand;
342 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
344 int i, remainder, status;
345 unsigned char *ptr = buffer;
346 unsigned char operand;
348 remainder = blockno % 8;
349 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
351 i = i - (index * blocksize);
352 if (blocksize != 1024) {
354 operand = (1 << remainder);
355 status = *ptr & operand;
357 *ptr = *ptr & ~(operand);
359 if (remainder == 0) {
364 operand = (1 << (remainder - 1));
366 status = *ptr & operand;
368 *ptr = *ptr & ~(operand);
372 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
374 int i, remainder, status;
375 unsigned char *ptr = buffer;
376 unsigned char operand;
378 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
380 remainder = inode_no % 8;
381 if (remainder == 0) {
386 operand = (1 << (remainder - 1));
388 status = *ptr & operand;
392 *ptr = *ptr | operand;
397 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
399 int i, remainder, status;
400 unsigned char *ptr = buffer;
401 unsigned char operand;
403 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
405 remainder = inode_no % 8;
406 if (remainder == 0) {
411 operand = (1 << (remainder - 1));
413 status = *ptr & operand;
415 *ptr = *ptr & ~(operand);
418 uint16_t ext4fs_checksum_update(uint32_t i)
420 struct ext2_block_group *desc;
421 struct ext_filesystem *fs = get_fs();
423 __le32 le32_i = cpu_to_le32(i);
425 desc = ext4fs_get_group_descriptor(fs, i);
426 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
427 int offset = offsetof(struct ext2_block_group, bg_checksum);
429 crc = ext2fs_crc16(~0, fs->sb->unique_id,
430 sizeof(fs->sb->unique_id));
431 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
432 crc = ext2fs_crc16(crc, desc, offset);
433 offset += sizeof(desc->bg_checksum); /* skip checksum */
434 assert(offset == sizeof(*desc));
435 if (offset < fs->gdsize) {
436 crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
437 fs->gdsize - offset);
444 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
447 int sizeof_void_space;
448 int new_entry_byte_reqd;
449 short padding_factor = 0;
451 if (dir->namelen % 4 != 0)
452 padding_factor = 4 - (dir->namelen % 4);
454 dentry_length = sizeof(struct ext2_dirent) +
455 dir->namelen + padding_factor;
456 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
457 if (sizeof_void_space == 0)
461 if (strlen(filename) % 4 != 0)
462 padding_factor = 4 - (strlen(filename) % 4);
464 new_entry_byte_reqd = strlen(filename) +
465 sizeof(struct ext2_dirent) + padding_factor;
466 if (sizeof_void_space >= new_entry_byte_reqd) {
467 dir->direntlen = cpu_to_le16(dentry_length);
468 return sizeof_void_space;
474 int ext4fs_update_parent_dentry(char *filename, int file_type)
476 unsigned int *zero_buffer = NULL;
477 char *root_first_block_buffer = NULL;
479 long int first_block_no_of_root = 0;
481 unsigned int new_entry_byte_reqd;
482 int sizeof_void_space = 0;
486 struct ext_filesystem *fs = get_fs();
487 /* directory entry */
488 struct ext2_dirent *dir;
489 char *temp_dir = NULL;
492 uint32_t new_blockcnt;
493 uint32_t directory_blocks;
495 zero_buffer = zalloc(fs->blksz);
497 printf("No Memory\n");
500 root_first_block_buffer = zalloc(fs->blksz);
501 if (!root_first_block_buffer) {
503 printf("No Memory\n");
506 new_entry_byte_reqd = ROUND(strlen(filename) +
507 sizeof(struct ext2_dirent), 4);
509 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
510 LOG2_BLOCK_SIZE(ext4fs_root);
511 blk_idx = directory_blocks - 1;
514 /* read the block no allocated to a file */
515 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx);
516 if (first_block_no_of_root <= 0)
519 status = ext4fs_devread((lbaint_t)first_block_no_of_root
521 0, fs->blksz, root_first_block_buffer);
525 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
527 dir = (struct ext2_dirent *)root_first_block_buffer;
530 while (le16_to_cpu(dir->direntlen) > 0) {
531 unsigned short used_len = ROUND(dir->namelen +
532 sizeof(struct ext2_dirent), 4);
534 /* last entry of block */
535 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
537 /* check if new entry fits */
538 if ((used_len + new_entry_byte_reqd) <=
539 le16_to_cpu(dir->direntlen)) {
540 dir->direntlen = cpu_to_le16(used_len);
544 printf("Block full, trying previous\n");
548 printf("All blocks full: Allocate new\n");
550 if (le32_to_cpu(g_parent_inode->flags) &
552 printf("Directory uses extents\n");
555 if (directory_blocks >= INDIRECT_BLOCKS) {
556 printf("Directory exceeds limit\n");
559 new_blk_no = ext4fs_get_new_blk_no();
560 if (new_blk_no == -1) {
561 printf("no block left to assign\n");
564 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
565 g_parent_inode->b.blocks.
566 dir_blocks[directory_blocks] =
567 cpu_to_le32(new_blk_no);
569 new_size = le32_to_cpu(g_parent_inode->size);
570 new_size += fs->blksz;
571 g_parent_inode->size = cpu_to_le32(new_size);
573 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
574 new_blockcnt += fs->sect_perblk;
575 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
577 if (ext4fs_put_metadata
578 (root_first_block_buffer,
579 first_block_no_of_root))
585 templength = le16_to_cpu(dir->direntlen);
586 totalbytes = totalbytes + templength;
587 sizeof_void_space = check_void_in_dentry(dir, filename);
588 if (sizeof_void_space)
591 dir = (struct ext2_dirent *)((char *)dir + templength);
594 /* make a pointer ready for creating next directory entry */
595 templength = le16_to_cpu(dir->direntlen);
596 totalbytes = totalbytes + templength;
597 dir = (struct ext2_dirent *)((char *)dir + templength);
599 /* get the next available inode number */
600 inodeno = ext4fs_get_new_inode_no();
602 printf("no inode left to assign\n");
605 dir->inode = cpu_to_le32(inodeno);
606 if (sizeof_void_space)
607 dir->direntlen = cpu_to_le16(sizeof_void_space);
609 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
611 dir->namelen = strlen(filename);
612 dir->filetype = FILETYPE_REG; /* regular file */
613 temp_dir = (char *)dir;
614 temp_dir = temp_dir + sizeof(struct ext2_dirent);
615 memcpy(temp_dir, filename, strlen(filename));
617 /* update or write the 1st block of root inode */
618 if (ext4fs_put_metadata(root_first_block_buffer,
619 first_block_no_of_root))
624 free(root_first_block_buffer);
629 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
636 char *block_buffer = NULL;
637 struct ext2_dirent *dir = NULL;
638 struct ext_filesystem *fs = get_fs();
639 uint32_t directory_blocks;
642 directory_blocks = le32_to_cpu(parent_inode->size) >>
643 LOG2_BLOCK_SIZE(ext4fs_root);
645 block_buffer = zalloc(fs->blksz);
649 /* get the block no allocated to a file */
650 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
651 blknr = read_allocated_block(parent_inode, blk_idx);
655 /* read the directory block */
656 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
657 0, fs->blksz, (char *)block_buffer);
663 dir = (struct ext2_dirent *)(block_buffer + offset);
664 direntname = (char*)(dir) + sizeof(struct ext2_dirent);
666 int direntlen = le16_to_cpu(dir->direntlen);
667 if (direntlen < sizeof(struct ext2_dirent))
670 if (dir->inode && (strlen(dirname) == dir->namelen) &&
671 (strncmp(dirname, direntname, dir->namelen) == 0)) {
672 inodeno = le32_to_cpu(dir->inode);
678 } while (offset < fs->blksz);
692 static int find_dir_depth(char *dirname)
694 char *token = strtok(dirname, "/");
696 while (token != NULL) {
697 token = strtok(NULL, "/");
700 return count + 1 + 1;
702 * for example for string /home/temp
703 * depth=home(1)+temp(1)+1 extra for NULL;
708 static int parse_path(char **arr, char *dirname)
710 char *token = strtok(dirname, "/");
714 arr[i] = zalloc(strlen("/") + 1);
717 memcpy(arr[i++], "/", strlen("/"));
719 /* add each path entry after root */
720 while (token != NULL) {
721 arr[i] = zalloc(strlen(token) + 1);
724 memcpy(arr[i++], token, strlen(token));
725 token = strtok(NULL, "/");
732 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
734 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
741 * Function: ext4fs_get_parent_inode_num
742 * Return Value: inode Number of the parent directory of file/Directory to be
744 * dirname : Input parmater, input path name of the file/directory to be created
745 * dname : Output parameter, to be filled with the name of the directory
746 * extracted from dirname
748 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
752 int matched_inode_no;
753 int result_inode_no = -1;
755 char *depth_dirname = NULL;
756 char *parse_dirname = NULL;
757 struct ext2_inode *parent_inode = NULL;
758 struct ext2_inode *first_inode = NULL;
759 struct ext2_inode temp_inode;
761 if (*dirname != '/') {
762 printf("Please supply Absolute path\n");
766 /* TODO: input validation make equivalent to linux */
767 depth_dirname = zalloc(strlen(dirname) + 1);
771 memcpy(depth_dirname, dirname, strlen(dirname));
772 depth = find_dir_depth(depth_dirname);
773 parse_dirname = zalloc(strlen(dirname) + 1);
776 memcpy(parse_dirname, dirname, strlen(dirname));
778 /* allocate memory for each directory level */
779 ptr = zalloc((depth) * sizeof(char *));
782 if (parse_path(ptr, parse_dirname))
784 parent_inode = zalloc(sizeof(struct ext2_inode));
787 first_inode = zalloc(sizeof(struct ext2_inode));
790 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
791 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
793 result_inode_no = EXT2_ROOT_INO;
794 for (i = 1; i < depth; i++) {
795 matched_inode_no = search_dir(parent_inode, ptr[i]);
796 if (matched_inode_no == -1) {
797 if (ptr[i + 1] == NULL && i == 1) {
798 result_inode_no = EXT2_ROOT_INO;
801 if (ptr[i + 1] == NULL)
803 printf("Invalid path\n");
804 result_inode_no = -1;
808 if (ptr[i + 1] != NULL) {
809 memset(parent_inode, '\0',
810 sizeof(struct ext2_inode));
811 if (ext4fs_iget(matched_inode_no,
813 result_inode_no = -1;
816 result_inode_no = matched_inode_no;
825 matched_inode_no = search_dir(first_inode, ptr[i]);
827 matched_inode_no = search_dir(parent_inode, ptr[i]);
829 if (matched_inode_no != -1) {
830 ext4fs_iget(matched_inode_no, &temp_inode);
831 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
832 printf("It is a Directory\n");
833 result_inode_no = -1;
838 if (strlen(ptr[i]) > 256) {
839 result_inode_no = -1;
842 memcpy(dname, ptr[i], strlen(ptr[i]));
847 for (i = 0; i < depth; i++) {
856 return result_inode_no;
859 static int unlink_filename(char *filename, unsigned int blknr)
864 char *block_buffer = NULL;
865 struct ext2_dirent *dir = NULL;
866 struct ext2_dirent *previous_dir;
867 struct ext_filesystem *fs = get_fs();
871 block_buffer = zalloc(fs->blksz);
875 /* read the directory block */
876 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
877 fs->blksz, block_buffer);
884 dir = (struct ext2_dirent *)(block_buffer + offset);
885 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
887 int direntlen = le16_to_cpu(dir->direntlen);
888 if (direntlen < sizeof(struct ext2_dirent))
891 if (dir->inode && (strlen(filename) == dir->namelen) &&
892 (strncmp(direntname, filename, dir->namelen) == 0)) {
893 inodeno = le32_to_cpu(dir->inode);
899 } while (offset < fs->blksz);
902 printf("file found, deleting\n");
903 if (ext4fs_log_journal(block_buffer, blknr))
907 /* merge dir entry with predecessor */
909 new_len = le16_to_cpu(previous_dir->direntlen);
910 new_len += le16_to_cpu(dir->direntlen);
911 previous_dir->direntlen = cpu_to_le16(new_len);
913 /* invalidate dir entry */
916 if (ext4fs_put_metadata(block_buffer, blknr))
926 int ext4fs_filename_unlink(char *filename)
931 uint32_t directory_blocks;
933 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
934 LOG2_BLOCK_SIZE(ext4fs_root);
936 /* read the block no allocated to a file */
937 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
938 blknr = read_allocated_block(g_parent_inode, blk_idx);
941 inodeno = unlink_filename(filename, blknr);
949 uint32_t ext4fs_get_new_blk_no(void)
955 static int prev_bg_bitmap_index = -1;
956 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
957 struct ext_filesystem *fs = get_fs();
958 char *journal_buffer = zalloc(fs->blksz);
959 char *zero_buffer = zalloc(fs->blksz);
960 if (!journal_buffer || !zero_buffer)
963 if (fs->first_pass_bbmap == 0) {
964 for (i = 0; i < fs->no_blkgrp; i++) {
965 struct ext2_block_group *bgd = NULL;
966 bgd = ext4fs_get_group_descriptor(fs, i);
967 if (ext4fs_bg_get_free_blocks(bgd, fs)) {
968 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
969 uint64_t b_bitmap_blk =
970 ext4fs_bg_get_block_id(bgd, fs);
971 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
972 memcpy(fs->blk_bmaps[i], zero_buffer,
974 put_ext4(b_bitmap_blk * fs->blksz,
975 fs->blk_bmaps[i], fs->blksz);
976 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
977 ext4fs_bg_set_flags(bgd, bg_flags);
980 _get_new_blk_no(fs->blk_bmaps[i]);
981 if (fs->curr_blkno == -1)
982 /* block bitmap is completely filled */
984 fs->curr_blkno = fs->curr_blkno +
986 fs->first_pass_bbmap++;
987 ext4fs_bg_free_blocks_dec(bgd, fs);
988 ext4fs_sb_free_blocks_dec(fs->sb);
989 status = ext4fs_devread(b_bitmap_blk *
995 if (ext4fs_log_journal(journal_buffer,
1000 debug("no space left on block group %d\n", i);
1008 /* get the blockbitmap index respective to blockno */
1009 bg_idx = fs->curr_blkno / blk_per_grp;
1010 if (fs->blksz == 1024) {
1011 remainder = fs->curr_blkno % blk_per_grp;
1017 * To skip completely filled block group bitmaps
1018 * Optimize the block allocation
1020 if (bg_idx >= fs->no_blkgrp)
1023 struct ext2_block_group *bgd = NULL;
1024 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1025 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1026 debug("block group %u is full. Skipping\n", bg_idx);
1027 fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1028 if (fs->blksz == 1024)
1029 fs->curr_blkno += 1;
1033 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1034 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1035 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1036 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1037 put_ext4(b_bitmap_blk * fs->blksz,
1038 zero_buffer, fs->blksz);
1039 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1040 ext4fs_bg_set_flags(bgd, bg_flags);
1043 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1045 debug("going for restart for the block no %ld %u\n",
1046 fs->curr_blkno, bg_idx);
1051 /* journal backup */
1052 if (prev_bg_bitmap_index != bg_idx) {
1053 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1054 0, fs->blksz, journal_buffer);
1057 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1060 prev_bg_bitmap_index = bg_idx;
1062 ext4fs_bg_free_blocks_dec(bgd, fs);
1063 ext4fs_sb_free_blocks_dec(fs->sb);
1067 free(journal_buffer);
1070 return fs->curr_blkno;
1072 free(journal_buffer);
1078 int ext4fs_get_new_inode_no(void)
1082 unsigned int ibmap_idx;
1083 static int prev_inode_bitmap_index = -1;
1084 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1085 struct ext_filesystem *fs = get_fs();
1086 char *journal_buffer = zalloc(fs->blksz);
1087 char *zero_buffer = zalloc(fs->blksz);
1088 if (!journal_buffer || !zero_buffer)
1090 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1091 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1093 if (fs->first_pass_ibmap == 0) {
1094 for (i = 0; i < fs->no_blkgrp; i++) {
1095 uint32_t free_inodes;
1096 struct ext2_block_group *bgd = NULL;
1097 bgd = ext4fs_get_group_descriptor(fs, i);
1098 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1100 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1101 uint64_t i_bitmap_blk =
1102 ext4fs_bg_get_inode_id(bgd, fs);
1104 bgd->bg_itable_unused = free_inodes;
1105 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1106 put_ext4(i_bitmap_blk * fs->blksz,
1107 zero_buffer, fs->blksz);
1108 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1109 ext4fs_bg_set_flags(bgd, bg_flags);
1110 memcpy(fs->inode_bmaps[i],
1111 zero_buffer, fs->blksz);
1114 _get_new_inode_no(fs->inode_bmaps[i]);
1115 if (fs->curr_inode_no == -1)
1116 /* inode bitmap is completely filled */
1118 fs->curr_inode_no = fs->curr_inode_no +
1119 (i * inodes_per_grp);
1120 fs->first_pass_ibmap++;
1121 ext4fs_bg_free_inodes_dec(bgd, fs);
1123 ext4fs_bg_itable_unused_dec(bgd, fs);
1124 ext4fs_sb_free_inodes_dec(fs->sb);
1125 status = ext4fs_devread(i_bitmap_blk *
1131 if (ext4fs_log_journal(journal_buffer,
1136 debug("no inode left on block group %d\n", i);
1141 fs->curr_inode_no++;
1142 /* get the blockbitmap index respective to blockno */
1143 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1144 struct ext2_block_group *bgd =
1145 ext4fs_get_group_descriptor(fs, ibmap_idx);
1146 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1147 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1149 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1150 put_ext4(i_bitmap_blk * fs->blksz,
1151 zero_buffer, fs->blksz);
1152 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1153 ext4fs_bg_set_flags(bgd, bg_flags);
1154 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1158 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1159 fs->inode_bmaps[ibmap_idx],
1161 debug("going for restart for the block no %d %u\n",
1162 fs->curr_inode_no, ibmap_idx);
1166 /* journal backup */
1167 if (prev_inode_bitmap_index != ibmap_idx) {
1168 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1169 0, fs->blksz, journal_buffer);
1172 if (ext4fs_log_journal(journal_buffer,
1173 le32_to_cpu(bgd->inode_id)))
1175 prev_inode_bitmap_index = ibmap_idx;
1177 ext4fs_bg_free_inodes_dec(bgd, fs);
1179 bgd->bg_itable_unused = bgd->free_inodes;
1180 ext4fs_sb_free_inodes_dec(fs->sb);
1185 free(journal_buffer);
1188 return fs->curr_inode_no;
1190 free(journal_buffer);
1198 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1199 unsigned int *total_remaining_blocks,
1200 unsigned int *no_blks_reqd)
1204 long int actual_block_no;
1205 long int si_blockno;
1206 /* si :single indirect */
1207 __le32 *si_buffer = NULL;
1208 __le32 *si_start_addr = NULL;
1209 struct ext_filesystem *fs = get_fs();
1211 if (*total_remaining_blocks != 0) {
1212 si_buffer = zalloc(fs->blksz);
1214 printf("No Memory\n");
1217 si_start_addr = si_buffer;
1218 si_blockno = ext4fs_get_new_blk_no();
1219 if (si_blockno == -1) {
1220 printf("no block left to assign\n");
1224 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1226 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1227 0, fs->blksz, (char *)si_buffer);
1228 memset(si_buffer, '\0', fs->blksz);
1232 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1233 actual_block_no = ext4fs_get_new_blk_no();
1234 if (actual_block_no == -1) {
1235 printf("no block left to assign\n");
1238 *si_buffer = cpu_to_le32(actual_block_no);
1239 debug("SIAB %u: %u\n", *si_buffer,
1240 *total_remaining_blocks);
1243 (*total_remaining_blocks)--;
1244 if (*total_remaining_blocks == 0)
1248 /* write the block to disk */
1249 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1250 si_start_addr, fs->blksz);
1251 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1254 free(si_start_addr);
1257 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1258 unsigned int *total_remaining_blocks,
1259 unsigned int *no_blks_reqd)
1264 long int actual_block_no;
1265 /* di:double indirect */
1266 long int di_blockno_parent;
1267 long int di_blockno_child;
1268 __le32 *di_parent_buffer = NULL;
1269 __le32 *di_child_buff = NULL;
1270 __le32 *di_block_start_addr = NULL;
1271 __le32 *di_child_buff_start = NULL;
1272 struct ext_filesystem *fs = get_fs();
1274 if (*total_remaining_blocks != 0) {
1275 /* double indirect parent block connecting to inode */
1276 di_blockno_parent = ext4fs_get_new_blk_no();
1277 if (di_blockno_parent == -1) {
1278 printf("no block left to assign\n");
1281 di_parent_buffer = zalloc(fs->blksz);
1282 if (!di_parent_buffer)
1285 di_block_start_addr = di_parent_buffer;
1287 debug("DIPB %ld: %u\n", di_blockno_parent,
1288 *total_remaining_blocks);
1290 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1292 fs->blksz, (char *)di_parent_buffer);
1295 printf("%s: Device read error!\n", __func__);
1298 memset(di_parent_buffer, '\0', fs->blksz);
1301 * start:for each double indirect parent
1302 * block create one more block
1304 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1305 di_blockno_child = ext4fs_get_new_blk_no();
1306 if (di_blockno_child == -1) {
1307 printf("no block left to assign\n");
1310 di_child_buff = zalloc(fs->blksz);
1314 di_child_buff_start = di_child_buff;
1315 *di_parent_buffer = cpu_to_le32(di_blockno_child);
1318 debug("DICB %ld: %u\n", di_blockno_child,
1319 *total_remaining_blocks);
1321 status = ext4fs_devread((lbaint_t)di_blockno_child *
1324 (char *)di_child_buff);
1327 printf("%s: Device read error!\n", __func__);
1330 memset(di_child_buff, '\0', fs->blksz);
1331 /* filling of actual datablocks for each child */
1332 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1333 actual_block_no = ext4fs_get_new_blk_no();
1334 if (actual_block_no == -1) {
1335 printf("no block left to assign\n");
1338 *di_child_buff = cpu_to_le32(actual_block_no);
1339 debug("DIAB %ld: %u\n", actual_block_no,
1340 *total_remaining_blocks);
1343 (*total_remaining_blocks)--;
1344 if (*total_remaining_blocks == 0)
1347 /* write the block table */
1348 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1349 di_child_buff_start, fs->blksz);
1350 free(di_child_buff_start);
1351 di_child_buff_start = NULL;
1353 if (*total_remaining_blocks == 0)
1356 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1357 di_block_start_addr, fs->blksz);
1358 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1361 free(di_block_start_addr);
1364 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1365 unsigned int *total_remaining_blocks,
1366 unsigned int *no_blks_reqd)
1371 long int actual_block_no;
1372 /* ti: Triple Indirect */
1373 long int ti_gp_blockno;
1374 long int ti_parent_blockno;
1375 long int ti_child_blockno;
1376 __le32 *ti_gp_buff = NULL;
1377 __le32 *ti_parent_buff = NULL;
1378 __le32 *ti_child_buff = NULL;
1379 __le32 *ti_gp_buff_start_addr = NULL;
1380 __le32 *ti_pbuff_start_addr = NULL;
1381 __le32 *ti_cbuff_start_addr = NULL;
1382 struct ext_filesystem *fs = get_fs();
1383 if (*total_remaining_blocks != 0) {
1384 /* triple indirect grand parent block connecting to inode */
1385 ti_gp_blockno = ext4fs_get_new_blk_no();
1386 if (ti_gp_blockno == -1) {
1387 printf("no block left to assign\n");
1390 ti_gp_buff = zalloc(fs->blksz);
1394 ti_gp_buff_start_addr = ti_gp_buff;
1396 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1397 *total_remaining_blocks);
1399 /* for each 4 byte grand parent entry create one more block */
1400 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1401 ti_parent_blockno = ext4fs_get_new_blk_no();
1402 if (ti_parent_blockno == -1) {
1403 printf("no block left to assign\n");
1406 ti_parent_buff = zalloc(fs->blksz);
1407 if (!ti_parent_buff)
1410 ti_pbuff_start_addr = ti_parent_buff;
1411 *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1414 debug("TIPB %ld: %u\n", ti_parent_blockno,
1415 *total_remaining_blocks);
1417 /* for each 4 byte entry parent create one more block */
1418 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1419 ti_child_blockno = ext4fs_get_new_blk_no();
1420 if (ti_child_blockno == -1) {
1421 printf("no block left assign\n");
1424 ti_child_buff = zalloc(fs->blksz);
1428 ti_cbuff_start_addr = ti_child_buff;
1429 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1432 debug("TICB %ld: %u\n", ti_parent_blockno,
1433 *total_remaining_blocks);
1435 /* fill actual datablocks for each child */
1436 for (k = 0; k < (fs->blksz / sizeof(int));
1439 ext4fs_get_new_blk_no();
1440 if (actual_block_no == -1) {
1441 printf("no block left\n");
1442 free(ti_cbuff_start_addr);
1445 *ti_child_buff = cpu_to_le32(actual_block_no);
1446 debug("TIAB %ld: %u\n", actual_block_no,
1447 *total_remaining_blocks);
1450 (*total_remaining_blocks)--;
1451 if (*total_remaining_blocks == 0)
1454 /* write the child block */
1455 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1456 (uint64_t)fs->blksz)),
1457 ti_cbuff_start_addr, fs->blksz);
1458 free(ti_cbuff_start_addr);
1460 if (*total_remaining_blocks == 0)
1463 /* write the parent block */
1464 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1465 ti_pbuff_start_addr, fs->blksz);
1466 free(ti_pbuff_start_addr);
1468 if (*total_remaining_blocks == 0)
1471 /* write the grand parent block */
1472 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1473 ti_gp_buff_start_addr, fs->blksz);
1474 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1475 free(ti_gp_buff_start_addr);
1479 free(ti_pbuff_start_addr);
1481 free(ti_gp_buff_start_addr);
1484 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1485 unsigned int total_remaining_blocks,
1486 unsigned int *total_no_of_block)
1489 long int direct_blockno;
1490 unsigned int no_blks_reqd = 0;
1492 /* allocation of direct blocks */
1493 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1494 direct_blockno = ext4fs_get_new_blk_no();
1495 if (direct_blockno == -1) {
1496 printf("no block left to assign\n");
1499 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1500 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1502 total_remaining_blocks--;
1505 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1507 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1509 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1511 *total_no_of_block += no_blks_reqd;
1516 static struct ext4_extent_header *ext4fs_get_extent_block
1517 (struct ext2_data *data, char *buf,
1518 struct ext4_extent_header *ext_block,
1519 uint32_t fileblock, int log2_blksz)
1521 struct ext4_extent_idx *index;
1522 unsigned long long block;
1523 int blksz = EXT2_BLOCK_SIZE(data);
1527 index = (struct ext4_extent_idx *)(ext_block + 1);
1529 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1532 if (ext_block->eh_depth == 0)
1537 if (i >= le16_to_cpu(ext_block->eh_entries))
1539 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1544 block = le16_to_cpu(index[i].ei_leaf_hi);
1545 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1547 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1549 ext_block = (struct ext4_extent_header *)buf;
1555 static int ext4fs_blockgroup
1556 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1559 unsigned int blkoff, desc_per_blk;
1560 int log2blksz = get_fs()->dev_desc->log2blksz;
1561 int desc_size = get_fs()->gdsize;
1563 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1565 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1566 group / desc_per_blk;
1567 blkoff = (group % desc_per_blk) * desc_size;
1569 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1570 group, blkno, blkoff);
1572 return ext4fs_devread((lbaint_t)blkno <<
1573 (LOG2_BLOCK_SIZE(data) - log2blksz),
1574 blkoff, desc_size, (char *)blkgrp);
1577 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1579 struct ext2_block_group blkgrp;
1580 struct ext2_sblock *sblock = &data->sblock;
1581 struct ext_filesystem *fs = get_fs();
1582 int log2blksz = get_fs()->dev_desc->log2blksz;
1583 int inodes_per_block, status;
1585 unsigned int blkoff;
1587 /* It is easier to calculate if the first inode is 0. */
1589 status = ext4fs_blockgroup(data, ino / le32_to_cpu
1590 (sblock->inodes_per_group), &blkgrp);
1594 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1595 blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
1596 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1597 blkoff = (ino % inodes_per_block) * fs->inodesz;
1598 /* Read the inode. */
1599 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1601 sizeof(struct ext2_inode), (char *)inode);
1608 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1615 long int perblock_parent;
1616 long int perblock_child;
1617 unsigned long long start;
1618 /* get the blocksize of the filesystem */
1619 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1620 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1621 - get_fs()->dev_desc->log2blksz;
1623 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1624 long int startblock, endblock;
1625 char *buf = zalloc(blksz);
1628 struct ext4_extent_header *ext_block;
1629 struct ext4_extent *extent;
1632 ext4fs_get_extent_block(ext4fs_root, buf,
1633 (struct ext4_extent_header *)
1634 inode->b.blocks.dir_blocks,
1635 fileblock, log2_blksz);
1637 printf("invalid extent block\n");
1642 extent = (struct ext4_extent *)(ext_block + 1);
1644 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1645 startblock = le32_to_cpu(extent[i].ee_block);
1646 endblock = startblock + le16_to_cpu(extent[i].ee_len);
1648 if (startblock > fileblock) {
1653 } else if (fileblock < endblock) {
1654 start = le16_to_cpu(extent[i].ee_start_hi);
1655 start = (start << 32) +
1656 le32_to_cpu(extent[i].ee_start_lo);
1658 return (fileblock - startblock) + start;
1666 /* Direct blocks. */
1667 if (fileblock < INDIRECT_BLOCKS)
1668 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1671 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1672 if (ext4fs_indir1_block == NULL) {
1673 ext4fs_indir1_block = zalloc(blksz);
1674 if (ext4fs_indir1_block == NULL) {
1675 printf("** SI ext2fs read block (indir 1)"
1676 "malloc failed. **\n");
1679 ext4fs_indir1_size = blksz;
1680 ext4fs_indir1_blkno = -1;
1682 if (blksz != ext4fs_indir1_size) {
1683 free(ext4fs_indir1_block);
1684 ext4fs_indir1_block = NULL;
1685 ext4fs_indir1_size = 0;
1686 ext4fs_indir1_blkno = -1;
1687 ext4fs_indir1_block = zalloc(blksz);
1688 if (ext4fs_indir1_block == NULL) {
1689 printf("** SI ext2fs read block (indir 1):"
1690 "malloc failed. **\n");
1693 ext4fs_indir1_size = blksz;
1695 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1696 log2_blksz) != ext4fs_indir1_blkno) {
1698 ext4fs_devread((lbaint_t)le32_to_cpu
1700 indir_block) << log2_blksz, 0,
1701 blksz, (char *)ext4fs_indir1_block);
1703 printf("** SI ext2fs read block (indir 1)"
1707 ext4fs_indir1_blkno =
1708 le32_to_cpu(inode->b.blocks.
1709 indir_block) << log2_blksz;
1711 blknr = le32_to_cpu(ext4fs_indir1_block
1712 [fileblock - INDIRECT_BLOCKS]);
1714 /* Double indirect. */
1715 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1716 (blksz / 4 + 1)))) {
1718 long int perblock = blksz / 4;
1719 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1721 if (ext4fs_indir1_block == NULL) {
1722 ext4fs_indir1_block = zalloc(blksz);
1723 if (ext4fs_indir1_block == NULL) {
1724 printf("** DI ext2fs read block (indir 2 1)"
1725 "malloc failed. **\n");
1728 ext4fs_indir1_size = blksz;
1729 ext4fs_indir1_blkno = -1;
1731 if (blksz != ext4fs_indir1_size) {
1732 free(ext4fs_indir1_block);
1733 ext4fs_indir1_block = NULL;
1734 ext4fs_indir1_size = 0;
1735 ext4fs_indir1_blkno = -1;
1736 ext4fs_indir1_block = zalloc(blksz);
1737 if (ext4fs_indir1_block == NULL) {
1738 printf("** DI ext2fs read block (indir 2 1)"
1739 "malloc failed. **\n");
1742 ext4fs_indir1_size = blksz;
1744 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1745 log2_blksz) != ext4fs_indir1_blkno) {
1747 ext4fs_devread((lbaint_t)le32_to_cpu
1749 double_indir_block) << log2_blksz,
1751 (char *)ext4fs_indir1_block);
1753 printf("** DI ext2fs read block (indir 2 1)"
1757 ext4fs_indir1_blkno =
1758 le32_to_cpu(inode->b.blocks.double_indir_block) <<
1762 if (ext4fs_indir2_block == NULL) {
1763 ext4fs_indir2_block = zalloc(blksz);
1764 if (ext4fs_indir2_block == NULL) {
1765 printf("** DI ext2fs read block (indir 2 2)"
1766 "malloc failed. **\n");
1769 ext4fs_indir2_size = blksz;
1770 ext4fs_indir2_blkno = -1;
1772 if (blksz != ext4fs_indir2_size) {
1773 free(ext4fs_indir2_block);
1774 ext4fs_indir2_block = NULL;
1775 ext4fs_indir2_size = 0;
1776 ext4fs_indir2_blkno = -1;
1777 ext4fs_indir2_block = zalloc(blksz);
1778 if (ext4fs_indir2_block == NULL) {
1779 printf("** DI ext2fs read block (indir 2 2)"
1780 "malloc failed. **\n");
1783 ext4fs_indir2_size = blksz;
1785 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1786 log2_blksz) != ext4fs_indir2_blkno) {
1787 status = ext4fs_devread((lbaint_t)le32_to_cpu
1788 (ext4fs_indir1_block
1790 perblock]) << log2_blksz, 0,
1792 (char *)ext4fs_indir2_block);
1794 printf("** DI ext2fs read block (indir 2 2)"
1798 ext4fs_indir2_blkno =
1799 le32_to_cpu(ext4fs_indir1_block[rblock
1804 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1806 /* Tripple indirect. */
1808 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1809 (blksz / 4 * blksz / 4));
1810 perblock_child = blksz / 4;
1811 perblock_parent = ((blksz / 4) * (blksz / 4));
1813 if (ext4fs_indir1_block == NULL) {
1814 ext4fs_indir1_block = zalloc(blksz);
1815 if (ext4fs_indir1_block == NULL) {
1816 printf("** TI ext2fs read block (indir 2 1)"
1817 "malloc failed. **\n");
1820 ext4fs_indir1_size = blksz;
1821 ext4fs_indir1_blkno = -1;
1823 if (blksz != ext4fs_indir1_size) {
1824 free(ext4fs_indir1_block);
1825 ext4fs_indir1_block = NULL;
1826 ext4fs_indir1_size = 0;
1827 ext4fs_indir1_blkno = -1;
1828 ext4fs_indir1_block = zalloc(blksz);
1829 if (ext4fs_indir1_block == NULL) {
1830 printf("** TI ext2fs read block (indir 2 1)"
1831 "malloc failed. **\n");
1834 ext4fs_indir1_size = blksz;
1836 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1837 log2_blksz) != ext4fs_indir1_blkno) {
1838 status = ext4fs_devread
1840 le32_to_cpu(inode->b.blocks.triple_indir_block)
1841 << log2_blksz, 0, blksz,
1842 (char *)ext4fs_indir1_block);
1844 printf("** TI ext2fs read block (indir 2 1)"
1848 ext4fs_indir1_blkno =
1849 le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1853 if (ext4fs_indir2_block == NULL) {
1854 ext4fs_indir2_block = zalloc(blksz);
1855 if (ext4fs_indir2_block == NULL) {
1856 printf("** TI ext2fs read block (indir 2 2)"
1857 "malloc failed. **\n");
1860 ext4fs_indir2_size = blksz;
1861 ext4fs_indir2_blkno = -1;
1863 if (blksz != ext4fs_indir2_size) {
1864 free(ext4fs_indir2_block);
1865 ext4fs_indir2_block = NULL;
1866 ext4fs_indir2_size = 0;
1867 ext4fs_indir2_blkno = -1;
1868 ext4fs_indir2_block = zalloc(blksz);
1869 if (ext4fs_indir2_block == NULL) {
1870 printf("** TI ext2fs read block (indir 2 2)"
1871 "malloc failed. **\n");
1874 ext4fs_indir2_size = blksz;
1876 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1877 perblock_parent]) <<
1879 != ext4fs_indir2_blkno) {
1880 status = ext4fs_devread((lbaint_t)le32_to_cpu
1881 (ext4fs_indir1_block
1883 perblock_parent]) <<
1884 log2_blksz, 0, blksz,
1885 (char *)ext4fs_indir2_block);
1887 printf("** TI ext2fs read block (indir 2 2)"
1891 ext4fs_indir2_blkno =
1892 le32_to_cpu(ext4fs_indir1_block[rblock /
1897 if (ext4fs_indir3_block == NULL) {
1898 ext4fs_indir3_block = zalloc(blksz);
1899 if (ext4fs_indir3_block == NULL) {
1900 printf("** TI ext2fs read block (indir 2 2)"
1901 "malloc failed. **\n");
1904 ext4fs_indir3_size = blksz;
1905 ext4fs_indir3_blkno = -1;
1907 if (blksz != ext4fs_indir3_size) {
1908 free(ext4fs_indir3_block);
1909 ext4fs_indir3_block = NULL;
1910 ext4fs_indir3_size = 0;
1911 ext4fs_indir3_blkno = -1;
1912 ext4fs_indir3_block = zalloc(blksz);
1913 if (ext4fs_indir3_block == NULL) {
1914 printf("** TI ext2fs read block (indir 2 2)"
1915 "malloc failed. **\n");
1918 ext4fs_indir3_size = blksz;
1920 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1923 log2_blksz) != ext4fs_indir3_blkno) {
1925 ext4fs_devread((lbaint_t)le32_to_cpu
1926 (ext4fs_indir2_block
1927 [(rblock / perblock_child)
1928 % (blksz / 4)]) << log2_blksz, 0,
1929 blksz, (char *)ext4fs_indir3_block);
1931 printf("** TI ext2fs read block (indir 2 2)"
1935 ext4fs_indir3_blkno =
1936 le32_to_cpu(ext4fs_indir2_block[(rblock /
1943 blknr = le32_to_cpu(ext4fs_indir3_block
1944 [rblock % perblock_child]);
1946 debug("read_allocated_block %ld\n", blknr);
1952 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1955 * This function assures that for a file with the same name but different size
1956 * the sequential store on the ext4 filesystem will be correct.
1958 * In this function the global data, responsible for internal representation
1959 * of the ext4 data are initialized to the reset state. Without this, during
1960 * replacement of the smaller file with the bigger truncation of new file was
1963 void ext4fs_reinit_global(void)
1965 if (ext4fs_indir1_block != NULL) {
1966 free(ext4fs_indir1_block);
1967 ext4fs_indir1_block = NULL;
1968 ext4fs_indir1_size = 0;
1969 ext4fs_indir1_blkno = -1;
1971 if (ext4fs_indir2_block != NULL) {
1972 free(ext4fs_indir2_block);
1973 ext4fs_indir2_block = NULL;
1974 ext4fs_indir2_size = 0;
1975 ext4fs_indir2_blkno = -1;
1977 if (ext4fs_indir3_block != NULL) {
1978 free(ext4fs_indir3_block);
1979 ext4fs_indir3_block = NULL;
1980 ext4fs_indir3_size = 0;
1981 ext4fs_indir3_blkno = -1;
1984 void ext4fs_close(void)
1986 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1987 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1990 if (ext4fs_root != NULL) {
1995 ext4fs_reinit_global();
1998 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1999 struct ext2fs_node **fnode, int *ftype)
2001 unsigned int fpos = 0;
2004 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2008 printf("Iterate dir %s\n", name);
2009 #endif /* of DEBUG */
2010 if (!diro->inode_read) {
2011 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2015 /* Search the file. */
2016 while (fpos < le32_to_cpu(diro->inode.size)) {
2017 struct ext2_dirent dirent;
2019 status = ext4fs_read_file(diro, fpos,
2020 sizeof(struct ext2_dirent),
2021 (char *)&dirent, &actread);
2025 if (dirent.direntlen == 0) {
2026 printf("Failed to iterate over directory %s\n", name);
2030 if (dirent.namelen != 0) {
2031 char filename[dirent.namelen + 1];
2032 struct ext2fs_node *fdiro;
2033 int type = FILETYPE_UNKNOWN;
2035 status = ext4fs_read_file(diro,
2037 sizeof(struct ext2_dirent),
2038 dirent.namelen, filename,
2043 fdiro = zalloc(sizeof(struct ext2fs_node));
2047 fdiro->data = diro->data;
2048 fdiro->ino = le32_to_cpu(dirent.inode);
2050 filename[dirent.namelen] = '\0';
2052 if (dirent.filetype != FILETYPE_UNKNOWN) {
2053 fdiro->inode_read = 0;
2055 if (dirent.filetype == FILETYPE_DIRECTORY)
2056 type = FILETYPE_DIRECTORY;
2057 else if (dirent.filetype == FILETYPE_SYMLINK)
2058 type = FILETYPE_SYMLINK;
2059 else if (dirent.filetype == FILETYPE_REG)
2060 type = FILETYPE_REG;
2062 status = ext4fs_read_inode(diro->data,
2070 fdiro->inode_read = 1;
2072 if ((le16_to_cpu(fdiro->inode.mode) &
2073 FILETYPE_INO_MASK) ==
2074 FILETYPE_INO_DIRECTORY) {
2075 type = FILETYPE_DIRECTORY;
2076 } else if ((le16_to_cpu(fdiro->inode.mode)
2077 & FILETYPE_INO_MASK) ==
2078 FILETYPE_INO_SYMLINK) {
2079 type = FILETYPE_SYMLINK;
2080 } else if ((le16_to_cpu(fdiro->inode.mode)
2081 & FILETYPE_INO_MASK) ==
2083 type = FILETYPE_REG;
2087 printf("iterate >%s<\n", filename);
2088 #endif /* of DEBUG */
2089 if ((name != NULL) && (fnode != NULL)
2090 && (ftype != NULL)) {
2091 if (strcmp(filename, name) == 0) {
2097 if (fdiro->inode_read == 0) {
2098 status = ext4fs_read_inode(diro->data,
2106 fdiro->inode_read = 1;
2109 case FILETYPE_DIRECTORY:
2112 case FILETYPE_SYMLINK:
2123 le32_to_cpu(fdiro->inode.size),
2128 fpos += le16_to_cpu(dirent.direntlen);
2133 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2136 struct ext2fs_node *diro = node;
2140 if (!diro->inode_read) {
2141 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2145 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2149 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2150 strncpy(symlink, diro->inode.b.symlink,
2151 le32_to_cpu(diro->inode.size));
2153 status = ext4fs_read_file(diro, 0,
2154 le32_to_cpu(diro->inode.size),
2156 if ((status < 0) || (actread == 0)) {
2161 symlink[le32_to_cpu(diro->inode.size)] = '\0';
2165 static int ext4fs_find_file1(const char *currpath,
2166 struct ext2fs_node *currroot,
2167 struct ext2fs_node **currfound, int *foundtype)
2169 char fpath[strlen(currpath) + 1];
2173 int type = FILETYPE_DIRECTORY;
2174 struct ext2fs_node *currnode = currroot;
2175 struct ext2fs_node *oldnode = currroot;
2177 strncpy(fpath, currpath, strlen(currpath) + 1);
2179 /* Remove all leading slashes. */
2180 while (*name == '/')
2184 *currfound = currnode;
2191 /* Extract the actual part from the pathname. */
2192 next = strchr(name, '/');
2194 /* Remove all leading slashes. */
2195 while (*next == '/')
2199 if (type != FILETYPE_DIRECTORY) {
2200 ext4fs_free_node(currnode, currroot);
2206 /* Iterate over the directory. */
2207 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2214 /* Read in the symlink and follow it. */
2215 if (type == FILETYPE_SYMLINK) {
2218 /* Test if the symlink does not loop. */
2219 if (++symlinknest == 8) {
2220 ext4fs_free_node(currnode, currroot);
2221 ext4fs_free_node(oldnode, currroot);
2225 symlink = ext4fs_read_symlink(currnode);
2226 ext4fs_free_node(currnode, currroot);
2229 ext4fs_free_node(oldnode, currroot);
2233 debug("Got symlink >%s<\n", symlink);
2235 if (symlink[0] == '/') {
2236 ext4fs_free_node(oldnode, currroot);
2237 oldnode = &ext4fs_root->diropen;
2240 /* Lookup the node the symlink points to. */
2241 status = ext4fs_find_file1(symlink, oldnode,
2247 ext4fs_free_node(oldnode, currroot);
2252 ext4fs_free_node(oldnode, currroot);
2254 /* Found the node! */
2255 if (!next || *next == '\0') {
2256 *currfound = currnode;
2265 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2266 struct ext2fs_node **foundnode, int expecttype)
2269 int foundtype = FILETYPE_DIRECTORY;
2275 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2279 /* Check if the node that was found was of the expected type. */
2280 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2282 else if ((expecttype == FILETYPE_DIRECTORY)
2283 && (foundtype != expecttype))
2289 int ext4fs_open(const char *filename, loff_t *len)
2291 struct ext2fs_node *fdiro = NULL;
2294 if (ext4fs_root == NULL)
2298 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2303 if (!fdiro->inode_read) {
2304 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2309 *len = le32_to_cpu(fdiro->inode.size);
2310 ext4fs_file = fdiro;
2314 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2319 int ext4fs_mount(unsigned part_length)
2321 struct ext2_data *data;
2323 struct ext_filesystem *fs = get_fs();
2324 data = zalloc(SUPERBLOCK_SIZE);
2328 /* Read the superblock. */
2329 status = ext4_read_superblock((char *)&data->sblock);
2334 /* Make sure this is an ext2 filesystem. */
2335 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2339 if (le32_to_cpu(data->sblock.revision_level) == 0) {
2343 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2344 __le32_to_cpu(data->sblock.feature_compatibility),
2345 __le32_to_cpu(data->sblock.feature_incompat),
2346 __le32_to_cpu(data->sblock.feature_ro_compat));
2348 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2349 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2350 EXT4_FEATURE_INCOMPAT_64BIT ?
2351 le16_to_cpu(data->sblock.descriptor_size) : 32;
2354 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2355 le32_to_cpu(data->sblock.revision_level),
2356 fs->inodesz, fs->gdsize);
2358 data->diropen.data = data;
2359 data->diropen.ino = 2;
2360 data->diropen.inode_read = 1;
2361 data->inode = &data->diropen.inode;
2363 status = ext4fs_read_inode(data, 2, data->inode);
2371 printf("Failed to mount ext2 filesystem...\n");