1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2011 - 2012 Samsung Electronics
4 * EXT4 filesystem implementation in Uboot by
5 * Uma Shankar <uma.shankar@samsung.com>
6 * Manjunatha C Achar <a.manjunatha@samsung.com>
8 * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
11 * esd gmbh <www.esd-electronics.com>
12 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
14 * based on code from grub2 fs/ext2.c and fs/fshelp.c by
15 * GRUB -- GRand Unified Bootloader
16 * Copyright (C) 2003, 2004 Free Software Foundation, Inc.
18 * ext4write : Based on generic ext4 protocol.
23 #include <ext_common.h>
30 #include <linux/stat.h>
31 #include <linux/time.h>
32 #include <asm/byteorder.h>
33 #include "ext4_common.h"
35 struct ext2_data *ext4fs_root;
36 struct ext2fs_node *ext4fs_file;
37 __le32 *ext4fs_indir1_block;
38 int ext4fs_indir1_size;
39 int ext4fs_indir1_blkno = -1;
40 __le32 *ext4fs_indir2_block;
41 int ext4fs_indir2_size;
42 int ext4fs_indir2_blkno = -1;
44 __le32 *ext4fs_indir3_block;
45 int ext4fs_indir3_size;
46 int ext4fs_indir3_blkno = -1;
47 struct ext2_inode *g_parent_inode;
48 static int symlinknest;
50 #if defined(CONFIG_EXT4_WRITE)
51 struct ext2_block_group *ext4fs_get_group_descriptor
52 (const struct ext_filesystem *fs, uint32_t bg_idx)
54 return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
57 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
59 sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
62 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
64 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
65 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
68 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
69 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
72 static inline void ext4fs_bg_free_inodes_dec
73 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
75 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
77 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
80 bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
82 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
85 static inline void ext4fs_bg_free_blocks_dec
86 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
88 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
90 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
93 bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
95 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
98 static inline void ext4fs_bg_itable_unused_dec
99 (struct ext2_block_group *bg, const struct ext_filesystem *fs)
101 uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
102 if (fs->gdsize == 64)
103 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
106 bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
107 if (fs->gdsize == 64)
108 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
111 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
113 uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
114 free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
118 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
120 sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
121 sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
124 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
125 const struct ext_filesystem *fs)
127 uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
128 if (fs->gdsize == 64)
129 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
134 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
135 const struct ext_filesystem *fs)
137 uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
138 if (fs->gdsize == 64)
139 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
143 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
145 return le16_to_cpu(bg->bg_flags);
148 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
151 bg->bg_flags = cpu_to_le16(flags);
154 /* Block number of the block bitmap */
155 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
156 const struct ext_filesystem *fs)
158 uint64_t block_nr = le32_to_cpu(bg->block_id);
159 if (fs->gdsize == 64)
160 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
164 /* Block number of the inode bitmap */
165 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
166 const struct ext_filesystem *fs)
168 uint64_t block_nr = le32_to_cpu(bg->inode_id);
169 if (fs->gdsize == 64)
170 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
175 /* Block number of the inode table */
176 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
177 const struct ext_filesystem *fs)
179 uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
180 if (fs->gdsize == 64)
182 (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
186 #if defined(CONFIG_EXT4_WRITE)
187 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
189 uint32_t res = size / n;
196 void put_ext4(uint64_t off, const void *buf, uint32_t size)
200 unsigned char *temp_ptr = NULL;
201 struct ext_filesystem *fs = get_fs();
202 int log2blksz = fs->dev_desc->log2blksz;
203 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
205 startblock = off >> log2blksz;
206 startblock += part_offset;
207 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
209 if (fs->dev_desc == NULL)
212 if ((startblock + (size >> log2blksz)) >
213 (part_offset + fs->total_sect)) {
214 printf("part_offset is " LBAFU "\n", part_offset);
215 printf("total_sector is %llu\n", fs->total_sect);
216 printf("error: overflow occurs\n");
221 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
223 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
224 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
226 if (size >> log2blksz != 0) {
227 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
228 (unsigned long *)buf);
230 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
232 memcpy(temp_ptr, buf, size);
233 blk_dwrite(fs->dev_desc, startblock, 1,
234 (unsigned long *)sec_buf);
239 static int _get_new_inode_no(unsigned char *buffer)
241 struct ext_filesystem *fs = get_fs();
247 /* get the blocksize of the filesystem */
248 unsigned char *ptr = buffer;
249 while (*ptr == 255) {
252 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
256 for (j = 0; j < fs->blksz; j++) {
261 status = input & operand;
276 static int _get_new_blk_no(unsigned char *buffer)
281 unsigned char *ptr = buffer;
282 struct ext_filesystem *fs = get_fs();
284 while (*ptr == 255) {
287 if (count == (fs->blksz * 8))
291 if (fs->blksz == 1024)
294 for (i = 0; i <= 7; i++) {
296 if (*ptr & operand) {
307 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
309 int i, remainder, status;
310 unsigned char *ptr = buffer;
311 unsigned char operand;
313 remainder = blockno % 8;
314 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
316 i = i - (index * blocksize);
317 if (blocksize != 1024) {
319 operand = 1 << remainder;
320 status = *ptr & operand;
324 *ptr = *ptr | operand;
327 if (remainder == 0) {
332 operand = (1 << (remainder - 1));
334 status = *ptr & operand;
338 *ptr = *ptr | operand;
343 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
345 int i, remainder, status;
346 unsigned char *ptr = buffer;
347 unsigned char operand;
349 remainder = blockno % 8;
350 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
352 i = i - (index * blocksize);
353 if (blocksize != 1024) {
355 operand = (1 << remainder);
356 status = *ptr & operand;
358 *ptr = *ptr & ~(operand);
360 if (remainder == 0) {
365 operand = (1 << (remainder - 1));
367 status = *ptr & operand;
369 *ptr = *ptr & ~(operand);
373 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
375 int i, remainder, status;
376 unsigned char *ptr = buffer;
377 unsigned char operand;
379 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
381 remainder = inode_no % 8;
382 if (remainder == 0) {
387 operand = (1 << (remainder - 1));
389 status = *ptr & operand;
393 *ptr = *ptr | operand;
398 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
400 int i, remainder, status;
401 unsigned char *ptr = buffer;
402 unsigned char operand;
404 inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
406 remainder = inode_no % 8;
407 if (remainder == 0) {
412 operand = (1 << (remainder - 1));
414 status = *ptr & operand;
416 *ptr = *ptr & ~(operand);
419 uint16_t ext4fs_checksum_update(uint32_t i)
421 struct ext2_block_group *desc;
422 struct ext_filesystem *fs = get_fs();
424 __le32 le32_i = cpu_to_le32(i);
426 desc = ext4fs_get_group_descriptor(fs, i);
427 if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
428 int offset = offsetof(struct ext2_block_group, bg_checksum);
430 crc = ext2fs_crc16(~0, fs->sb->unique_id,
431 sizeof(fs->sb->unique_id));
432 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
433 crc = ext2fs_crc16(crc, desc, offset);
434 offset += sizeof(desc->bg_checksum); /* skip checksum */
435 assert(offset == sizeof(*desc));
436 if (offset < fs->gdsize) {
437 crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
438 fs->gdsize - offset);
445 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
448 int sizeof_void_space;
449 int new_entry_byte_reqd;
450 short padding_factor = 0;
452 if (dir->namelen % 4 != 0)
453 padding_factor = 4 - (dir->namelen % 4);
455 dentry_length = sizeof(struct ext2_dirent) +
456 dir->namelen + padding_factor;
457 sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
458 if (sizeof_void_space == 0)
462 if (strlen(filename) % 4 != 0)
463 padding_factor = 4 - (strlen(filename) % 4);
465 new_entry_byte_reqd = strlen(filename) +
466 sizeof(struct ext2_dirent) + padding_factor;
467 if (sizeof_void_space >= new_entry_byte_reqd) {
468 dir->direntlen = cpu_to_le16(dentry_length);
469 return sizeof_void_space;
475 int ext4fs_update_parent_dentry(char *filename, int file_type)
477 unsigned int *zero_buffer = NULL;
478 char *root_first_block_buffer = NULL;
480 long int first_block_no_of_root = 0;
482 unsigned int new_entry_byte_reqd;
483 int sizeof_void_space = 0;
487 struct ext_filesystem *fs = get_fs();
488 /* directory entry */
489 struct ext2_dirent *dir;
490 char *temp_dir = NULL;
493 uint32_t new_blockcnt;
494 uint32_t directory_blocks;
496 zero_buffer = zalloc(fs->blksz);
498 printf("No Memory\n");
501 root_first_block_buffer = zalloc(fs->blksz);
502 if (!root_first_block_buffer) {
504 printf("No Memory\n");
507 new_entry_byte_reqd = ROUND(strlen(filename) +
508 sizeof(struct ext2_dirent), 4);
510 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
511 LOG2_BLOCK_SIZE(ext4fs_root);
512 blk_idx = directory_blocks - 1;
515 /* read the block no allocated to a file */
516 first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx,
518 if (first_block_no_of_root <= 0)
521 status = ext4fs_devread((lbaint_t)first_block_no_of_root
523 0, fs->blksz, root_first_block_buffer);
527 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
529 dir = (struct ext2_dirent *)root_first_block_buffer;
532 while (le16_to_cpu(dir->direntlen) > 0) {
533 unsigned short used_len = ROUND(dir->namelen +
534 sizeof(struct ext2_dirent), 4);
536 /* last entry of block */
537 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
539 /* check if new entry fits */
540 if ((used_len + new_entry_byte_reqd) <=
541 le16_to_cpu(dir->direntlen)) {
542 dir->direntlen = cpu_to_le16(used_len);
546 printf("Block full, trying previous\n");
550 printf("All blocks full: Allocate new\n");
552 if (le32_to_cpu(g_parent_inode->flags) &
554 printf("Directory uses extents\n");
557 if (directory_blocks >= INDIRECT_BLOCKS) {
558 printf("Directory exceeds limit\n");
561 new_blk_no = ext4fs_get_new_blk_no();
562 if (new_blk_no == -1) {
563 printf("no block left to assign\n");
566 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
567 g_parent_inode->b.blocks.
568 dir_blocks[directory_blocks] =
569 cpu_to_le32(new_blk_no);
571 new_size = le32_to_cpu(g_parent_inode->size);
572 new_size += fs->blksz;
573 g_parent_inode->size = cpu_to_le32(new_size);
575 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
576 new_blockcnt += fs->blksz >> LOG2_SECTOR_SIZE;
577 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
579 if (ext4fs_put_metadata
580 (root_first_block_buffer,
581 first_block_no_of_root))
587 templength = le16_to_cpu(dir->direntlen);
588 totalbytes = totalbytes + templength;
589 sizeof_void_space = check_void_in_dentry(dir, filename);
590 if (sizeof_void_space)
593 dir = (struct ext2_dirent *)((char *)dir + templength);
596 /* make a pointer ready for creating next directory entry */
597 templength = le16_to_cpu(dir->direntlen);
598 totalbytes = totalbytes + templength;
599 dir = (struct ext2_dirent *)((char *)dir + templength);
601 /* get the next available inode number */
602 inodeno = ext4fs_get_new_inode_no();
604 printf("no inode left to assign\n");
607 dir->inode = cpu_to_le32(inodeno);
608 if (sizeof_void_space)
609 dir->direntlen = cpu_to_le16(sizeof_void_space);
611 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
613 dir->namelen = strlen(filename);
614 dir->filetype = file_type;
615 temp_dir = (char *)dir;
616 temp_dir = temp_dir + sizeof(struct ext2_dirent);
617 memcpy(temp_dir, filename, strlen(filename));
619 /* update or write the 1st block of root inode */
620 if (ext4fs_put_metadata(root_first_block_buffer,
621 first_block_no_of_root))
626 free(root_first_block_buffer);
631 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
638 char *block_buffer = NULL;
639 struct ext2_dirent *dir = NULL;
640 struct ext_filesystem *fs = get_fs();
641 uint32_t directory_blocks;
644 directory_blocks = le32_to_cpu(parent_inode->size) >>
645 LOG2_BLOCK_SIZE(ext4fs_root);
647 block_buffer = zalloc(fs->blksz);
651 /* get the block no allocated to a file */
652 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
653 blknr = read_allocated_block(parent_inode, blk_idx, NULL);
657 /* read the directory block */
658 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
659 0, fs->blksz, (char *)block_buffer);
666 printf("Badly aligned ext2_dirent\n");
670 dir = (struct ext2_dirent *)(block_buffer + offset);
671 direntname = (char*)(dir) + sizeof(struct ext2_dirent);
673 int direntlen = le16_to_cpu(dir->direntlen);
674 if (direntlen < sizeof(struct ext2_dirent))
677 if (dir->inode && (strlen(dirname) == dir->namelen) &&
678 (strncmp(dirname, direntname, dir->namelen) == 0)) {
679 inodeno = le32_to_cpu(dir->inode);
685 } while (offset < fs->blksz);
699 static int find_dir_depth(char *dirname)
701 char *token = strtok(dirname, "/");
703 while (token != NULL) {
704 token = strtok(NULL, "/");
707 return count + 1 + 1;
709 * for example for string /home/temp
710 * depth=home(1)+temp(1)+1 extra for NULL;
715 static int parse_path(char **arr, char *dirname)
717 char *token = strtok(dirname, "/");
721 arr[i] = zalloc(strlen("/") + 1);
724 memcpy(arr[i++], "/", strlen("/"));
726 /* add each path entry after root */
727 while (token != NULL) {
728 arr[i] = zalloc(strlen(token) + 1);
731 memcpy(arr[i++], token, strlen(token));
732 token = strtok(NULL, "/");
739 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
741 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
748 * Function: ext4fs_get_parent_inode_num
749 * Return Value: inode Number of the parent directory of file/Directory to be
751 * dirname : Input parmater, input path name of the file/directory to be created
752 * dname : Output parameter, to be filled with the name of the directory
753 * extracted from dirname
755 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
759 int matched_inode_no;
760 int result_inode_no = -1;
762 char *depth_dirname = NULL;
763 char *parse_dirname = NULL;
764 struct ext2_inode *parent_inode = NULL;
765 struct ext2_inode *first_inode = NULL;
766 struct ext2_inode temp_inode;
768 if (*dirname != '/') {
769 printf("Please supply Absolute path\n");
773 /* TODO: input validation make equivalent to linux */
774 depth_dirname = zalloc(strlen(dirname) + 1);
778 memcpy(depth_dirname, dirname, strlen(dirname));
779 depth = find_dir_depth(depth_dirname);
780 parse_dirname = zalloc(strlen(dirname) + 1);
783 memcpy(parse_dirname, dirname, strlen(dirname));
785 /* allocate memory for each directory level */
786 ptr = zalloc((depth) * sizeof(char *));
789 if (parse_path(ptr, parse_dirname))
791 parent_inode = zalloc(sizeof(struct ext2_inode));
794 first_inode = zalloc(sizeof(struct ext2_inode));
797 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
798 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
800 result_inode_no = EXT2_ROOT_INO;
801 for (i = 1; i < depth; i++) {
802 matched_inode_no = search_dir(parent_inode, ptr[i]);
803 if (matched_inode_no == -1) {
804 if (ptr[i + 1] == NULL && i == 1) {
805 result_inode_no = EXT2_ROOT_INO;
808 if (ptr[i + 1] == NULL)
810 printf("Invalid path\n");
811 result_inode_no = -1;
815 if (ptr[i + 1] != NULL) {
816 memset(parent_inode, '\0',
817 sizeof(struct ext2_inode));
818 if (ext4fs_iget(matched_inode_no,
820 result_inode_no = -1;
823 result_inode_no = matched_inode_no;
832 matched_inode_no = search_dir(first_inode, ptr[i]);
834 matched_inode_no = search_dir(parent_inode, ptr[i]);
836 if (matched_inode_no != -1) {
837 ext4fs_iget(matched_inode_no, &temp_inode);
838 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
839 printf("It is a Directory\n");
840 result_inode_no = -1;
845 if (strlen(ptr[i]) > 256) {
846 result_inode_no = -1;
849 memcpy(dname, ptr[i], strlen(ptr[i]));
854 for (i = 0; i < depth; i++) {
863 return result_inode_no;
866 static int unlink_filename(char *filename, unsigned int blknr)
871 char *block_buffer = NULL;
872 struct ext2_dirent *dir = NULL;
873 struct ext2_dirent *previous_dir;
874 struct ext_filesystem *fs = get_fs();
878 block_buffer = zalloc(fs->blksz);
882 /* read the directory block */
883 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
884 fs->blksz, block_buffer);
891 printf("Badly aligned ext2_dirent\n");
896 dir = (struct ext2_dirent *)(block_buffer + offset);
897 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
899 int direntlen = le16_to_cpu(dir->direntlen);
900 if (direntlen < sizeof(struct ext2_dirent))
903 if (dir->inode && (strlen(filename) == dir->namelen) &&
904 (strncmp(direntname, filename, dir->namelen) == 0)) {
905 inodeno = le32_to_cpu(dir->inode);
911 } while (offset < fs->blksz);
914 printf("file found, deleting\n");
915 if (ext4fs_log_journal(block_buffer, blknr))
919 /* merge dir entry with predecessor */
921 new_len = le16_to_cpu(previous_dir->direntlen);
922 new_len += le16_to_cpu(dir->direntlen);
923 previous_dir->direntlen = cpu_to_le16(new_len);
925 /* invalidate dir entry */
928 if (ext4fs_put_metadata(block_buffer, blknr))
938 int ext4fs_filename_unlink(char *filename)
943 uint32_t directory_blocks;
945 directory_blocks = le32_to_cpu(g_parent_inode->size) >>
946 LOG2_BLOCK_SIZE(ext4fs_root);
948 /* read the block no allocated to a file */
949 for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
950 blknr = read_allocated_block(g_parent_inode, blk_idx, NULL);
953 inodeno = unlink_filename(filename, blknr);
961 uint32_t ext4fs_get_new_blk_no(void)
967 static int prev_bg_bitmap_index = -1;
968 unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
969 struct ext_filesystem *fs = get_fs();
970 char *journal_buffer = zalloc(fs->blksz);
971 char *zero_buffer = zalloc(fs->blksz);
972 if (!journal_buffer || !zero_buffer)
975 if (fs->first_pass_bbmap == 0) {
976 for (i = 0; i < fs->no_blkgrp; i++) {
977 struct ext2_block_group *bgd = NULL;
978 bgd = ext4fs_get_group_descriptor(fs, i);
979 if (ext4fs_bg_get_free_blocks(bgd, fs)) {
980 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
981 uint64_t b_bitmap_blk =
982 ext4fs_bg_get_block_id(bgd, fs);
983 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
984 memcpy(fs->blk_bmaps[i], zero_buffer,
986 put_ext4(b_bitmap_blk * fs->blksz,
987 fs->blk_bmaps[i], fs->blksz);
988 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
989 ext4fs_bg_set_flags(bgd, bg_flags);
992 _get_new_blk_no(fs->blk_bmaps[i]);
993 if (fs->curr_blkno == -1)
994 /* block bitmap is completely filled */
996 fs->curr_blkno = fs->curr_blkno +
998 fs->first_pass_bbmap++;
999 ext4fs_bg_free_blocks_dec(bgd, fs);
1000 ext4fs_sb_free_blocks_dec(fs->sb);
1001 status = ext4fs_devread(b_bitmap_blk *
1007 if (ext4fs_log_journal(journal_buffer,
1012 debug("no space left on block group %d\n", i);
1020 /* get the blockbitmap index respective to blockno */
1021 bg_idx = fs->curr_blkno / blk_per_grp;
1022 if (fs->blksz == 1024) {
1023 remainder = fs->curr_blkno % blk_per_grp;
1029 * To skip completely filled block group bitmaps
1030 * Optimize the block allocation
1032 if (bg_idx >= fs->no_blkgrp)
1035 struct ext2_block_group *bgd = NULL;
1036 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1037 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1038 debug("block group %u is full. Skipping\n", bg_idx);
1039 fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1040 if (fs->blksz == 1024)
1041 fs->curr_blkno += 1;
1045 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1046 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1047 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1048 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1049 put_ext4(b_bitmap_blk * fs->blksz,
1050 zero_buffer, fs->blksz);
1051 bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1052 ext4fs_bg_set_flags(bgd, bg_flags);
1055 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1057 debug("going for restart for the block no %ld %u\n",
1058 fs->curr_blkno, bg_idx);
1063 /* journal backup */
1064 if (prev_bg_bitmap_index != bg_idx) {
1065 status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1066 0, fs->blksz, journal_buffer);
1069 if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1072 prev_bg_bitmap_index = bg_idx;
1074 ext4fs_bg_free_blocks_dec(bgd, fs);
1075 ext4fs_sb_free_blocks_dec(fs->sb);
1079 free(journal_buffer);
1082 return fs->curr_blkno;
1084 free(journal_buffer);
1090 int ext4fs_get_new_inode_no(void)
1094 unsigned int ibmap_idx;
1095 static int prev_inode_bitmap_index = -1;
1096 unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1097 struct ext_filesystem *fs = get_fs();
1098 char *journal_buffer = zalloc(fs->blksz);
1099 char *zero_buffer = zalloc(fs->blksz);
1100 if (!journal_buffer || !zero_buffer)
1102 int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1103 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1105 if (fs->first_pass_ibmap == 0) {
1106 for (i = 0; i < fs->no_blkgrp; i++) {
1107 uint32_t free_inodes;
1108 struct ext2_block_group *bgd = NULL;
1109 bgd = ext4fs_get_group_descriptor(fs, i);
1110 free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1112 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1113 uint64_t i_bitmap_blk =
1114 ext4fs_bg_get_inode_id(bgd, fs);
1116 bgd->bg_itable_unused = free_inodes;
1117 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1118 put_ext4(i_bitmap_blk * fs->blksz,
1119 zero_buffer, fs->blksz);
1120 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1121 ext4fs_bg_set_flags(bgd, bg_flags);
1122 memcpy(fs->inode_bmaps[i],
1123 zero_buffer, fs->blksz);
1126 _get_new_inode_no(fs->inode_bmaps[i]);
1127 if (fs->curr_inode_no == -1)
1128 /* inode bitmap is completely filled */
1130 fs->curr_inode_no = fs->curr_inode_no +
1131 (i * inodes_per_grp);
1132 fs->first_pass_ibmap++;
1133 ext4fs_bg_free_inodes_dec(bgd, fs);
1135 ext4fs_bg_itable_unused_dec(bgd, fs);
1136 ext4fs_sb_free_inodes_dec(fs->sb);
1137 status = ext4fs_devread(i_bitmap_blk *
1143 if (ext4fs_log_journal(journal_buffer,
1148 debug("no inode left on block group %d\n", i);
1153 fs->curr_inode_no++;
1154 /* get the blockbitmap index respective to blockno */
1155 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1156 struct ext2_block_group *bgd =
1157 ext4fs_get_group_descriptor(fs, ibmap_idx);
1158 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1159 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1161 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1162 put_ext4(i_bitmap_blk * fs->blksz,
1163 zero_buffer, fs->blksz);
1164 bg_flags &= ~EXT4_BG_INODE_UNINIT;
1165 ext4fs_bg_set_flags(bgd, bg_flags);
1166 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1170 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1171 fs->inode_bmaps[ibmap_idx],
1173 debug("going for restart for the block no %d %u\n",
1174 fs->curr_inode_no, ibmap_idx);
1178 /* journal backup */
1179 if (prev_inode_bitmap_index != ibmap_idx) {
1180 status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1181 0, fs->blksz, journal_buffer);
1184 if (ext4fs_log_journal(journal_buffer,
1185 le32_to_cpu(bgd->inode_id)))
1187 prev_inode_bitmap_index = ibmap_idx;
1189 ext4fs_bg_free_inodes_dec(bgd, fs);
1191 bgd->bg_itable_unused = bgd->free_inodes;
1192 ext4fs_sb_free_inodes_dec(fs->sb);
1197 free(journal_buffer);
1200 return fs->curr_inode_no;
1202 free(journal_buffer);
1210 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1211 unsigned int *total_remaining_blocks,
1212 unsigned int *no_blks_reqd)
1216 long int actual_block_no;
1217 long int si_blockno;
1218 /* si :single indirect */
1219 __le32 *si_buffer = NULL;
1220 __le32 *si_start_addr = NULL;
1221 struct ext_filesystem *fs = get_fs();
1223 if (*total_remaining_blocks != 0) {
1224 si_buffer = zalloc(fs->blksz);
1226 printf("No Memory\n");
1229 si_start_addr = si_buffer;
1230 si_blockno = ext4fs_get_new_blk_no();
1231 if (si_blockno == -1) {
1232 printf("no block left to assign\n");
1236 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1238 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1239 0, fs->blksz, (char *)si_buffer);
1240 memset(si_buffer, '\0', fs->blksz);
1244 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1245 actual_block_no = ext4fs_get_new_blk_no();
1246 if (actual_block_no == -1) {
1247 printf("no block left to assign\n");
1250 *si_buffer = cpu_to_le32(actual_block_no);
1251 debug("SIAB %u: %u\n", *si_buffer,
1252 *total_remaining_blocks);
1255 (*total_remaining_blocks)--;
1256 if (*total_remaining_blocks == 0)
1260 /* write the block to disk */
1261 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1262 si_start_addr, fs->blksz);
1263 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1266 free(si_start_addr);
1269 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1270 unsigned int *total_remaining_blocks,
1271 unsigned int *no_blks_reqd)
1276 long int actual_block_no;
1277 /* di:double indirect */
1278 long int di_blockno_parent;
1279 long int di_blockno_child;
1280 __le32 *di_parent_buffer = NULL;
1281 __le32 *di_child_buff = NULL;
1282 __le32 *di_block_start_addr = NULL;
1283 __le32 *di_child_buff_start = NULL;
1284 struct ext_filesystem *fs = get_fs();
1286 if (*total_remaining_blocks != 0) {
1287 /* double indirect parent block connecting to inode */
1288 di_blockno_parent = ext4fs_get_new_blk_no();
1289 if (di_blockno_parent == -1) {
1290 printf("no block left to assign\n");
1293 di_parent_buffer = zalloc(fs->blksz);
1294 if (!di_parent_buffer)
1297 di_block_start_addr = di_parent_buffer;
1299 debug("DIPB %ld: %u\n", di_blockno_parent,
1300 *total_remaining_blocks);
1302 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1304 fs->blksz, (char *)di_parent_buffer);
1307 printf("%s: Device read error!\n", __func__);
1310 memset(di_parent_buffer, '\0', fs->blksz);
1313 * start:for each double indirect parent
1314 * block create one more block
1316 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1317 di_blockno_child = ext4fs_get_new_blk_no();
1318 if (di_blockno_child == -1) {
1319 printf("no block left to assign\n");
1322 di_child_buff = zalloc(fs->blksz);
1326 di_child_buff_start = di_child_buff;
1327 *di_parent_buffer = cpu_to_le32(di_blockno_child);
1330 debug("DICB %ld: %u\n", di_blockno_child,
1331 *total_remaining_blocks);
1333 status = ext4fs_devread((lbaint_t)di_blockno_child *
1336 (char *)di_child_buff);
1339 printf("%s: Device read error!\n", __func__);
1342 memset(di_child_buff, '\0', fs->blksz);
1343 /* filling of actual datablocks for each child */
1344 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1345 actual_block_no = ext4fs_get_new_blk_no();
1346 if (actual_block_no == -1) {
1347 printf("no block left to assign\n");
1350 *di_child_buff = cpu_to_le32(actual_block_no);
1351 debug("DIAB %ld: %u\n", actual_block_no,
1352 *total_remaining_blocks);
1355 (*total_remaining_blocks)--;
1356 if (*total_remaining_blocks == 0)
1359 /* write the block table */
1360 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1361 di_child_buff_start, fs->blksz);
1362 free(di_child_buff_start);
1363 di_child_buff_start = NULL;
1365 if (*total_remaining_blocks == 0)
1368 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1369 di_block_start_addr, fs->blksz);
1370 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1373 free(di_block_start_addr);
1376 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1377 unsigned int *total_remaining_blocks,
1378 unsigned int *no_blks_reqd)
1383 long int actual_block_no;
1384 /* ti: Triple Indirect */
1385 long int ti_gp_blockno;
1386 long int ti_parent_blockno;
1387 long int ti_child_blockno;
1388 __le32 *ti_gp_buff = NULL;
1389 __le32 *ti_parent_buff = NULL;
1390 __le32 *ti_child_buff = NULL;
1391 __le32 *ti_gp_buff_start_addr = NULL;
1392 __le32 *ti_pbuff_start_addr = NULL;
1393 __le32 *ti_cbuff_start_addr = NULL;
1394 struct ext_filesystem *fs = get_fs();
1395 if (*total_remaining_blocks != 0) {
1396 /* triple indirect grand parent block connecting to inode */
1397 ti_gp_blockno = ext4fs_get_new_blk_no();
1398 if (ti_gp_blockno == -1) {
1399 printf("no block left to assign\n");
1402 ti_gp_buff = zalloc(fs->blksz);
1406 ti_gp_buff_start_addr = ti_gp_buff;
1408 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1409 *total_remaining_blocks);
1411 /* for each 4 byte grand parent entry create one more block */
1412 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1413 ti_parent_blockno = ext4fs_get_new_blk_no();
1414 if (ti_parent_blockno == -1) {
1415 printf("no block left to assign\n");
1418 ti_parent_buff = zalloc(fs->blksz);
1419 if (!ti_parent_buff)
1422 ti_pbuff_start_addr = ti_parent_buff;
1423 *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1426 debug("TIPB %ld: %u\n", ti_parent_blockno,
1427 *total_remaining_blocks);
1429 /* for each 4 byte entry parent create one more block */
1430 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1431 ti_child_blockno = ext4fs_get_new_blk_no();
1432 if (ti_child_blockno == -1) {
1433 printf("no block left assign\n");
1436 ti_child_buff = zalloc(fs->blksz);
1440 ti_cbuff_start_addr = ti_child_buff;
1441 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1444 debug("TICB %ld: %u\n", ti_parent_blockno,
1445 *total_remaining_blocks);
1447 /* fill actual datablocks for each child */
1448 for (k = 0; k < (fs->blksz / sizeof(int));
1451 ext4fs_get_new_blk_no();
1452 if (actual_block_no == -1) {
1453 printf("no block left\n");
1454 free(ti_cbuff_start_addr);
1457 *ti_child_buff = cpu_to_le32(actual_block_no);
1458 debug("TIAB %ld: %u\n", actual_block_no,
1459 *total_remaining_blocks);
1462 (*total_remaining_blocks)--;
1463 if (*total_remaining_blocks == 0)
1466 /* write the child block */
1467 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1468 (uint64_t)fs->blksz)),
1469 ti_cbuff_start_addr, fs->blksz);
1470 free(ti_cbuff_start_addr);
1472 if (*total_remaining_blocks == 0)
1475 /* write the parent block */
1476 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1477 ti_pbuff_start_addr, fs->blksz);
1478 free(ti_pbuff_start_addr);
1480 if (*total_remaining_blocks == 0)
1483 /* write the grand parent block */
1484 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1485 ti_gp_buff_start_addr, fs->blksz);
1486 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1487 free(ti_gp_buff_start_addr);
1491 free(ti_pbuff_start_addr);
1493 free(ti_gp_buff_start_addr);
1496 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1497 unsigned int total_remaining_blocks,
1498 unsigned int *total_no_of_block)
1501 long int direct_blockno;
1502 unsigned int no_blks_reqd = 0;
1504 /* allocation of direct blocks */
1505 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1506 direct_blockno = ext4fs_get_new_blk_no();
1507 if (direct_blockno == -1) {
1508 printf("no block left to assign\n");
1511 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1512 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1514 total_remaining_blocks--;
1517 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1519 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1521 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1523 *total_no_of_block += no_blks_reqd;
1528 static struct ext4_extent_header *ext4fs_get_extent_block
1529 (struct ext2_data *data, struct ext_block_cache *cache,
1530 struct ext4_extent_header *ext_block,
1531 uint32_t fileblock, int log2_blksz)
1533 struct ext4_extent_idx *index;
1534 unsigned long long block;
1535 int blksz = EXT2_BLOCK_SIZE(data);
1539 index = (struct ext4_extent_idx *)(ext_block + 1);
1541 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1544 if (ext_block->eh_depth == 0)
1549 if (i >= le16_to_cpu(ext_block->eh_entries))
1551 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1554 * If first logical block number is higher than requested fileblock,
1555 * it is a sparse file. This is handled on upper layer.
1560 block = le16_to_cpu(index[i].ei_leaf_hi);
1561 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1562 block <<= log2_blksz;
1563 if (!ext_cache_read(cache, (lbaint_t)block, blksz))
1565 ext_block = (struct ext4_extent_header *)cache->buf;
1569 static int ext4fs_blockgroup
1570 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1573 unsigned int blkoff, desc_per_blk;
1574 int log2blksz = get_fs()->dev_desc->log2blksz;
1575 int desc_size = get_fs()->gdsize;
1579 desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1581 if (desc_per_blk == 0)
1583 blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1584 group / desc_per_blk;
1585 blkoff = (group % desc_per_blk) * desc_size;
1587 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1588 group, blkno, blkoff);
1590 return ext4fs_devread((lbaint_t)blkno <<
1591 (LOG2_BLOCK_SIZE(data) - log2blksz),
1592 blkoff, desc_size, (char *)blkgrp);
1595 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1597 struct ext2_block_group *blkgrp;
1598 struct ext2_sblock *sblock = &data->sblock;
1599 struct ext_filesystem *fs = get_fs();
1600 int log2blksz = get_fs()->dev_desc->log2blksz;
1601 int inodes_per_block, status;
1603 unsigned int blkoff;
1605 /* Allocate blkgrp based on gdsize (for 64-bit support). */
1606 blkgrp = zalloc(get_fs()->gdsize);
1610 /* It is easier to calculate if the first inode is 0. */
1612 if ( le32_to_cpu(sblock->inodes_per_group) == 0 || fs->inodesz == 0) {
1616 status = ext4fs_blockgroup(data, ino / le32_to_cpu
1617 (sblock->inodes_per_group), blkgrp);
1623 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1624 if ( inodes_per_block == 0 ) {
1628 blkno = ext4fs_bg_get_inode_table_id(blkgrp, fs) +
1629 (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1630 blkoff = (ino % inodes_per_block) * fs->inodesz;
1632 /* Free blkgrp as it is no longer required. */
1635 /* Read the inode. */
1636 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1638 sizeof(struct ext2_inode), (char *)inode);
1645 long int read_allocated_block(struct ext2_inode *inode, int fileblock,
1646 struct ext_block_cache *cache)
1653 long int perblock_parent;
1654 long int perblock_child;
1655 unsigned long long start;
1656 /* get the blocksize of the filesystem */
1657 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1658 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1659 - get_fs()->dev_desc->log2blksz;
1661 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1662 long int startblock, endblock;
1663 struct ext_block_cache *c, cd;
1664 struct ext4_extent_header *ext_block;
1665 struct ext4_extent *extent;
1675 ext4fs_get_extent_block(ext4fs_root, c,
1676 (struct ext4_extent_header *)
1677 inode->b.blocks.dir_blocks,
1678 fileblock, log2_blksz);
1680 printf("invalid extent block\n");
1686 extent = (struct ext4_extent *)(ext_block + 1);
1688 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1689 startblock = le32_to_cpu(extent[i].ee_block);
1690 endblock = startblock + le16_to_cpu(extent[i].ee_len);
1692 if (startblock > fileblock) {
1698 } else if (fileblock < endblock) {
1699 start = le16_to_cpu(extent[i].ee_start_hi);
1700 start = (start << 32) +
1701 le32_to_cpu(extent[i].ee_start_lo);
1704 return (fileblock - startblock) + start;
1713 /* Direct blocks. */
1714 if (fileblock < INDIRECT_BLOCKS)
1715 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1718 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1719 if (ext4fs_indir1_block == NULL) {
1720 ext4fs_indir1_block = zalloc(blksz);
1721 if (ext4fs_indir1_block == NULL) {
1722 printf("** SI ext2fs read block (indir 1)"
1723 "malloc failed. **\n");
1726 ext4fs_indir1_size = blksz;
1727 ext4fs_indir1_blkno = -1;
1729 if (blksz != ext4fs_indir1_size) {
1730 free(ext4fs_indir1_block);
1731 ext4fs_indir1_block = NULL;
1732 ext4fs_indir1_size = 0;
1733 ext4fs_indir1_blkno = -1;
1734 ext4fs_indir1_block = zalloc(blksz);
1735 if (ext4fs_indir1_block == NULL) {
1736 printf("** SI ext2fs read block (indir 1):"
1737 "malloc failed. **\n");
1740 ext4fs_indir1_size = blksz;
1742 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1743 log2_blksz) != ext4fs_indir1_blkno) {
1745 ext4fs_devread((lbaint_t)le32_to_cpu
1747 indir_block) << log2_blksz, 0,
1748 blksz, (char *)ext4fs_indir1_block);
1750 printf("** SI ext2fs read block (indir 1)"
1754 ext4fs_indir1_blkno =
1755 le32_to_cpu(inode->b.blocks.
1756 indir_block) << log2_blksz;
1758 blknr = le32_to_cpu(ext4fs_indir1_block
1759 [fileblock - INDIRECT_BLOCKS]);
1761 /* Double indirect. */
1762 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1763 (blksz / 4 + 1)))) {
1765 long int perblock = blksz / 4;
1766 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1768 if (ext4fs_indir1_block == NULL) {
1769 ext4fs_indir1_block = zalloc(blksz);
1770 if (ext4fs_indir1_block == NULL) {
1771 printf("** DI ext2fs read block (indir 2 1)"
1772 "malloc failed. **\n");
1775 ext4fs_indir1_size = blksz;
1776 ext4fs_indir1_blkno = -1;
1778 if (blksz != ext4fs_indir1_size) {
1779 free(ext4fs_indir1_block);
1780 ext4fs_indir1_block = NULL;
1781 ext4fs_indir1_size = 0;
1782 ext4fs_indir1_blkno = -1;
1783 ext4fs_indir1_block = zalloc(blksz);
1784 if (ext4fs_indir1_block == NULL) {
1785 printf("** DI ext2fs read block (indir 2 1)"
1786 "malloc failed. **\n");
1789 ext4fs_indir1_size = blksz;
1791 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1792 log2_blksz) != ext4fs_indir1_blkno) {
1794 ext4fs_devread((lbaint_t)le32_to_cpu
1796 double_indir_block) << log2_blksz,
1798 (char *)ext4fs_indir1_block);
1800 printf("** DI ext2fs read block (indir 2 1)"
1804 ext4fs_indir1_blkno =
1805 le32_to_cpu(inode->b.blocks.double_indir_block) <<
1809 if (ext4fs_indir2_block == NULL) {
1810 ext4fs_indir2_block = zalloc(blksz);
1811 if (ext4fs_indir2_block == NULL) {
1812 printf("** DI ext2fs read block (indir 2 2)"
1813 "malloc failed. **\n");
1816 ext4fs_indir2_size = blksz;
1817 ext4fs_indir2_blkno = -1;
1819 if (blksz != ext4fs_indir2_size) {
1820 free(ext4fs_indir2_block);
1821 ext4fs_indir2_block = NULL;
1822 ext4fs_indir2_size = 0;
1823 ext4fs_indir2_blkno = -1;
1824 ext4fs_indir2_block = zalloc(blksz);
1825 if (ext4fs_indir2_block == NULL) {
1826 printf("** DI ext2fs read block (indir 2 2)"
1827 "malloc failed. **\n");
1830 ext4fs_indir2_size = blksz;
1832 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1833 log2_blksz) != ext4fs_indir2_blkno) {
1834 status = ext4fs_devread((lbaint_t)le32_to_cpu
1835 (ext4fs_indir1_block
1837 perblock]) << log2_blksz, 0,
1839 (char *)ext4fs_indir2_block);
1841 printf("** DI ext2fs read block (indir 2 2)"
1845 ext4fs_indir2_blkno =
1846 le32_to_cpu(ext4fs_indir1_block[rblock
1851 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1853 /* Tripple indirect. */
1855 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1856 (blksz / 4 * blksz / 4));
1857 perblock_child = blksz / 4;
1858 perblock_parent = ((blksz / 4) * (blksz / 4));
1860 if (ext4fs_indir1_block == NULL) {
1861 ext4fs_indir1_block = zalloc(blksz);
1862 if (ext4fs_indir1_block == NULL) {
1863 printf("** TI ext2fs read block (indir 2 1)"
1864 "malloc failed. **\n");
1867 ext4fs_indir1_size = blksz;
1868 ext4fs_indir1_blkno = -1;
1870 if (blksz != ext4fs_indir1_size) {
1871 free(ext4fs_indir1_block);
1872 ext4fs_indir1_block = NULL;
1873 ext4fs_indir1_size = 0;
1874 ext4fs_indir1_blkno = -1;
1875 ext4fs_indir1_block = zalloc(blksz);
1876 if (ext4fs_indir1_block == NULL) {
1877 printf("** TI ext2fs read block (indir 2 1)"
1878 "malloc failed. **\n");
1881 ext4fs_indir1_size = blksz;
1883 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1884 log2_blksz) != ext4fs_indir1_blkno) {
1885 status = ext4fs_devread
1887 le32_to_cpu(inode->b.blocks.triple_indir_block)
1888 << log2_blksz, 0, blksz,
1889 (char *)ext4fs_indir1_block);
1891 printf("** TI ext2fs read block (indir 2 1)"
1895 ext4fs_indir1_blkno =
1896 le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1900 if (ext4fs_indir2_block == NULL) {
1901 ext4fs_indir2_block = zalloc(blksz);
1902 if (ext4fs_indir2_block == NULL) {
1903 printf("** TI ext2fs read block (indir 2 2)"
1904 "malloc failed. **\n");
1907 ext4fs_indir2_size = blksz;
1908 ext4fs_indir2_blkno = -1;
1910 if (blksz != ext4fs_indir2_size) {
1911 free(ext4fs_indir2_block);
1912 ext4fs_indir2_block = NULL;
1913 ext4fs_indir2_size = 0;
1914 ext4fs_indir2_blkno = -1;
1915 ext4fs_indir2_block = zalloc(blksz);
1916 if (ext4fs_indir2_block == NULL) {
1917 printf("** TI ext2fs read block (indir 2 2)"
1918 "malloc failed. **\n");
1921 ext4fs_indir2_size = blksz;
1923 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1924 perblock_parent]) <<
1926 != ext4fs_indir2_blkno) {
1927 status = ext4fs_devread((lbaint_t)le32_to_cpu
1928 (ext4fs_indir1_block
1930 perblock_parent]) <<
1931 log2_blksz, 0, blksz,
1932 (char *)ext4fs_indir2_block);
1934 printf("** TI ext2fs read block (indir 2 2)"
1938 ext4fs_indir2_blkno =
1939 le32_to_cpu(ext4fs_indir1_block[rblock /
1944 if (ext4fs_indir3_block == NULL) {
1945 ext4fs_indir3_block = zalloc(blksz);
1946 if (ext4fs_indir3_block == NULL) {
1947 printf("** TI ext2fs read block (indir 2 2)"
1948 "malloc failed. **\n");
1951 ext4fs_indir3_size = blksz;
1952 ext4fs_indir3_blkno = -1;
1954 if (blksz != ext4fs_indir3_size) {
1955 free(ext4fs_indir3_block);
1956 ext4fs_indir3_block = NULL;
1957 ext4fs_indir3_size = 0;
1958 ext4fs_indir3_blkno = -1;
1959 ext4fs_indir3_block = zalloc(blksz);
1960 if (ext4fs_indir3_block == NULL) {
1961 printf("** TI ext2fs read block (indir 2 2)"
1962 "malloc failed. **\n");
1965 ext4fs_indir3_size = blksz;
1967 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1970 log2_blksz) != ext4fs_indir3_blkno) {
1972 ext4fs_devread((lbaint_t)le32_to_cpu
1973 (ext4fs_indir2_block
1974 [(rblock / perblock_child)
1975 % (blksz / 4)]) << log2_blksz, 0,
1976 blksz, (char *)ext4fs_indir3_block);
1978 printf("** TI ext2fs read block (indir 2 2)"
1982 ext4fs_indir3_blkno =
1983 le32_to_cpu(ext4fs_indir2_block[(rblock /
1990 blknr = le32_to_cpu(ext4fs_indir3_block
1991 [rblock % perblock_child]);
1993 debug("read_allocated_block %ld\n", blknr);
1999 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
2002 * This function assures that for a file with the same name but different size
2003 * the sequential store on the ext4 filesystem will be correct.
2005 * In this function the global data, responsible for internal representation
2006 * of the ext4 data are initialized to the reset state. Without this, during
2007 * replacement of the smaller file with the bigger truncation of new file was
2010 void ext4fs_reinit_global(void)
2012 if (ext4fs_indir1_block != NULL) {
2013 free(ext4fs_indir1_block);
2014 ext4fs_indir1_block = NULL;
2015 ext4fs_indir1_size = 0;
2016 ext4fs_indir1_blkno = -1;
2018 if (ext4fs_indir2_block != NULL) {
2019 free(ext4fs_indir2_block);
2020 ext4fs_indir2_block = NULL;
2021 ext4fs_indir2_size = 0;
2022 ext4fs_indir2_blkno = -1;
2024 if (ext4fs_indir3_block != NULL) {
2025 free(ext4fs_indir3_block);
2026 ext4fs_indir3_block = NULL;
2027 ext4fs_indir3_size = 0;
2028 ext4fs_indir3_blkno = -1;
2031 void ext4fs_close(void)
2033 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
2034 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
2037 if (ext4fs_root != NULL) {
2042 ext4fs_reinit_global();
2045 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2046 struct ext2fs_node **fnode, int *ftype)
2048 unsigned int fpos = 0;
2051 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2055 printf("Iterate dir %s\n", name);
2056 #endif /* of DEBUG */
2057 if (!diro->inode_read) {
2058 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2062 /* Search the file. */
2063 while (fpos < le32_to_cpu(diro->inode.size)) {
2064 struct ext2_dirent dirent;
2066 status = ext4fs_read_file(diro, fpos,
2067 sizeof(struct ext2_dirent),
2068 (char *)&dirent, &actread);
2072 if (dirent.direntlen == 0) {
2073 printf("Failed to iterate over directory %s\n", name);
2077 if (dirent.namelen != 0) {
2078 char filename[dirent.namelen + 1];
2079 struct ext2fs_node *fdiro;
2080 int type = FILETYPE_UNKNOWN;
2082 status = ext4fs_read_file(diro,
2084 sizeof(struct ext2_dirent),
2085 dirent.namelen, filename,
2090 fdiro = zalloc(sizeof(struct ext2fs_node));
2094 fdiro->data = diro->data;
2095 fdiro->ino = le32_to_cpu(dirent.inode);
2097 filename[dirent.namelen] = '\0';
2099 if (dirent.filetype != FILETYPE_UNKNOWN) {
2100 fdiro->inode_read = 0;
2102 if (dirent.filetype == FILETYPE_DIRECTORY)
2103 type = FILETYPE_DIRECTORY;
2104 else if (dirent.filetype == FILETYPE_SYMLINK)
2105 type = FILETYPE_SYMLINK;
2106 else if (dirent.filetype == FILETYPE_REG)
2107 type = FILETYPE_REG;
2109 status = ext4fs_read_inode(diro->data,
2117 fdiro->inode_read = 1;
2119 if ((le16_to_cpu(fdiro->inode.mode) &
2120 FILETYPE_INO_MASK) ==
2121 FILETYPE_INO_DIRECTORY) {
2122 type = FILETYPE_DIRECTORY;
2123 } else if ((le16_to_cpu(fdiro->inode.mode)
2124 & FILETYPE_INO_MASK) ==
2125 FILETYPE_INO_SYMLINK) {
2126 type = FILETYPE_SYMLINK;
2127 } else if ((le16_to_cpu(fdiro->inode.mode)
2128 & FILETYPE_INO_MASK) ==
2130 type = FILETYPE_REG;
2134 printf("iterate >%s<\n", filename);
2135 #endif /* of DEBUG */
2136 if ((name != NULL) && (fnode != NULL)
2137 && (ftype != NULL)) {
2138 if (strcmp(filename, name) == 0) {
2144 if (fdiro->inode_read == 0) {
2145 status = ext4fs_read_inode(diro->data,
2153 fdiro->inode_read = 1;
2156 case FILETYPE_DIRECTORY:
2159 case FILETYPE_SYMLINK:
2170 le32_to_cpu(fdiro->inode.size),
2175 fpos += le16_to_cpu(dirent.direntlen);
2180 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2183 struct ext2fs_node *diro = node;
2187 if (!diro->inode_read) {
2188 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2192 symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2196 if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2197 strncpy(symlink, diro->inode.b.symlink,
2198 le32_to_cpu(diro->inode.size));
2200 status = ext4fs_read_file(diro, 0,
2201 le32_to_cpu(diro->inode.size),
2203 if ((status < 0) || (actread == 0)) {
2208 symlink[le32_to_cpu(diro->inode.size)] = '\0';
2212 static int ext4fs_find_file1(const char *currpath,
2213 struct ext2fs_node *currroot,
2214 struct ext2fs_node **currfound, int *foundtype)
2216 char fpath[strlen(currpath) + 1];
2220 int type = FILETYPE_DIRECTORY;
2221 struct ext2fs_node *currnode = currroot;
2222 struct ext2fs_node *oldnode = currroot;
2224 strncpy(fpath, currpath, strlen(currpath) + 1);
2226 /* Remove all leading slashes. */
2227 while (*name == '/')
2231 *currfound = currnode;
2238 /* Extract the actual part from the pathname. */
2239 next = strchr(name, '/');
2241 /* Remove all leading slashes. */
2242 while (*next == '/')
2246 if (type != FILETYPE_DIRECTORY) {
2247 ext4fs_free_node(currnode, currroot);
2253 /* Iterate over the directory. */
2254 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2261 /* Read in the symlink and follow it. */
2262 if (type == FILETYPE_SYMLINK) {
2265 /* Test if the symlink does not loop. */
2266 if (++symlinknest == 8) {
2267 ext4fs_free_node(currnode, currroot);
2268 ext4fs_free_node(oldnode, currroot);
2272 symlink = ext4fs_read_symlink(currnode);
2273 ext4fs_free_node(currnode, currroot);
2276 ext4fs_free_node(oldnode, currroot);
2280 debug("Got symlink >%s<\n", symlink);
2282 if (symlink[0] == '/') {
2283 ext4fs_free_node(oldnode, currroot);
2284 oldnode = &ext4fs_root->diropen;
2287 /* Lookup the node the symlink points to. */
2288 status = ext4fs_find_file1(symlink, oldnode,
2294 ext4fs_free_node(oldnode, currroot);
2299 ext4fs_free_node(oldnode, currroot);
2301 /* Found the node! */
2302 if (!next || *next == '\0') {
2303 *currfound = currnode;
2312 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2313 struct ext2fs_node **foundnode, int expecttype)
2316 int foundtype = FILETYPE_DIRECTORY;
2322 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2326 /* Check if the node that was found was of the expected type. */
2327 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2329 else if ((expecttype == FILETYPE_DIRECTORY)
2330 && (foundtype != expecttype))
2336 int ext4fs_open(const char *filename, loff_t *len)
2338 struct ext2fs_node *fdiro = NULL;
2341 if (ext4fs_root == NULL)
2345 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2350 if (!fdiro->inode_read) {
2351 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2356 *len = le32_to_cpu(fdiro->inode.size);
2357 ext4fs_file = fdiro;
2361 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2366 int ext4fs_mount(unsigned part_length)
2368 struct ext2_data *data;
2370 struct ext_filesystem *fs = get_fs();
2371 data = zalloc(SUPERBLOCK_SIZE);
2375 /* Read the superblock. */
2376 status = ext4_read_superblock((char *)&data->sblock);
2381 /* Make sure this is an ext2 filesystem. */
2382 if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2386 if (le32_to_cpu(data->sblock.revision_level) == 0) {
2390 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2391 __le32_to_cpu(data->sblock.feature_compatibility),
2392 __le32_to_cpu(data->sblock.feature_incompat),
2393 __le32_to_cpu(data->sblock.feature_ro_compat));
2395 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2396 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2397 EXT4_FEATURE_INCOMPAT_64BIT ?
2398 le16_to_cpu(data->sblock.descriptor_size) : 32;
2401 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2402 le32_to_cpu(data->sblock.revision_level),
2403 fs->inodesz, fs->gdsize);
2405 data->diropen.data = data;
2406 data->diropen.ino = 2;
2407 data->diropen.inode_read = 1;
2408 data->inode = &data->diropen.inode;
2410 status = ext4fs_read_inode(data, 2, data->inode);
2418 printf("Failed to mount ext2 filesystem...\n");