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 uint32_t *ext4fs_indir1_block;
37 int ext4fs_indir1_size;
38 int ext4fs_indir1_blkno = -1;
39 uint32_t *ext4fs_indir2_block;
40 int ext4fs_indir2_size;
41 int ext4fs_indir2_blkno = -1;
43 uint32_t *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 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
52 uint32_t res = size / n;
59 void put_ext4(uint64_t off, void *buf, uint32_t size)
63 unsigned char *temp_ptr = NULL;
64 struct ext_filesystem *fs = get_fs();
65 int log2blksz = fs->dev_desc->log2blksz;
66 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
68 startblock = off >> log2blksz;
69 startblock += part_offset;
70 remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
72 if (fs->dev_desc == NULL)
75 if ((startblock + (size >> log2blksz)) >
76 (part_offset + fs->total_sect)) {
77 printf("part_offset is " LBAFU "\n", part_offset);
78 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
79 printf("error: overflow occurs\n");
84 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
86 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
87 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
89 if (size >> log2blksz != 0) {
90 blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
91 (unsigned long *)buf);
93 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
95 memcpy(temp_ptr, buf, size);
96 blk_dwrite(fs->dev_desc, startblock, 1,
97 (unsigned long *)sec_buf);
102 static int _get_new_inode_no(unsigned char *buffer)
104 struct ext_filesystem *fs = get_fs();
110 /* get the blocksize of the filesystem */
111 unsigned char *ptr = buffer;
112 while (*ptr == 255) {
115 if (count > ext4fs_root->sblock.inodes_per_group)
119 for (j = 0; j < fs->blksz; j++) {
124 status = input & operand;
139 static int _get_new_blk_no(unsigned char *buffer)
145 unsigned char *ptr = buffer;
146 struct ext_filesystem *fs = get_fs();
148 if (fs->blksz != 1024)
153 while (*ptr == 255) {
156 if (count == (fs->blksz * 8))
160 for (j = 0; j < fs->blksz; j++) {
165 status = input & operand;
180 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
182 int i, remainder, status;
183 unsigned char *ptr = buffer;
184 unsigned char operand;
186 remainder = blockno % 8;
187 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
189 i = i - (index * blocksize);
190 if (blocksize != 1024) {
192 operand = 1 << remainder;
193 status = *ptr & operand;
197 *ptr = *ptr | operand;
200 if (remainder == 0) {
205 operand = (1 << (remainder - 1));
207 status = *ptr & operand;
211 *ptr = *ptr | operand;
216 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
218 int i, remainder, status;
219 unsigned char *ptr = buffer;
220 unsigned char operand;
222 remainder = blockno % 8;
223 int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
225 i = i - (index * blocksize);
226 if (blocksize != 1024) {
228 operand = (1 << remainder);
229 status = *ptr & operand;
231 *ptr = *ptr & ~(operand);
233 if (remainder == 0) {
238 operand = (1 << (remainder - 1));
240 status = *ptr & operand;
242 *ptr = *ptr & ~(operand);
246 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
248 int i, remainder, status;
249 unsigned char *ptr = buffer;
250 unsigned char operand;
252 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
254 remainder = inode_no % 8;
255 if (remainder == 0) {
260 operand = (1 << (remainder - 1));
262 status = *ptr & operand;
266 *ptr = *ptr | operand;
271 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
273 int i, remainder, status;
274 unsigned char *ptr = buffer;
275 unsigned char operand;
277 inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
279 remainder = inode_no % 8;
280 if (remainder == 0) {
285 operand = (1 << (remainder - 1));
287 status = *ptr & operand;
289 *ptr = *ptr & ~(operand);
292 int ext4fs_checksum_update(unsigned int i)
294 struct ext2_block_group *desc;
295 struct ext_filesystem *fs = get_fs();
298 desc = (struct ext2_block_group *)&fs->bgd[i];
299 if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
300 int offset = offsetof(struct ext2_block_group, bg_checksum);
302 crc = ext2fs_crc16(~0, fs->sb->unique_id,
303 sizeof(fs->sb->unique_id));
304 crc = ext2fs_crc16(crc, &i, sizeof(i));
305 crc = ext2fs_crc16(crc, desc, offset);
306 offset += sizeof(desc->bg_checksum); /* skip checksum */
307 assert(offset == sizeof(*desc));
313 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
316 int sizeof_void_space;
317 int new_entry_byte_reqd;
318 short padding_factor = 0;
320 if (dir->namelen % 4 != 0)
321 padding_factor = 4 - (dir->namelen % 4);
323 dentry_length = sizeof(struct ext2_dirent) +
324 dir->namelen + padding_factor;
325 sizeof_void_space = dir->direntlen - dentry_length;
326 if (sizeof_void_space == 0)
330 if (strlen(filename) % 4 != 0)
331 padding_factor = 4 - (strlen(filename) % 4);
333 new_entry_byte_reqd = strlen(filename) +
334 sizeof(struct ext2_dirent) + padding_factor;
335 if (sizeof_void_space >= new_entry_byte_reqd) {
336 dir->direntlen = dentry_length;
337 return sizeof_void_space;
343 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
345 unsigned int *zero_buffer = NULL;
346 char *root_first_block_buffer = NULL;
349 long int first_block_no_of_root = 0;
350 long int previous_blknr = -1;
352 short int padding_factor = 0;
353 unsigned int new_entry_byte_reqd;
354 unsigned int last_entry_dirlen;
355 int sizeof_void_space = 0;
359 struct ext_filesystem *fs = get_fs();
360 /* directory entry */
361 struct ext2_dirent *dir;
362 char *temp_dir = NULL;
364 zero_buffer = zalloc(fs->blksz);
366 printf("No Memory\n");
369 root_first_block_buffer = zalloc(fs->blksz);
370 if (!root_first_block_buffer) {
372 printf("No Memory\n");
377 /* read the block no allocated to a file */
378 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
380 root_blknr = read_allocated_block(g_parent_inode,
382 if (root_blknr == 0) {
383 first_block_no_of_root = previous_blknr;
386 previous_blknr = root_blknr;
389 status = ext4fs_devread((lbaint_t)first_block_no_of_root
391 0, fs->blksz, root_first_block_buffer);
395 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
397 dir = (struct ext2_dirent *)root_first_block_buffer;
399 while (dir->direntlen > 0) {
401 * blocksize-totalbytes because last directory length
402 * i.e. dir->direntlen is free availble space in the
403 * block that means it is a last entry of directory
407 /* traversing the each directory entry */
408 if (fs->blksz - totalbytes == dir->direntlen) {
409 if (strlen(filename) % 4 != 0)
410 padding_factor = 4 - (strlen(filename) % 4);
412 new_entry_byte_reqd = strlen(filename) +
413 sizeof(struct ext2_dirent) + padding_factor;
416 * update last directory entry length to its
417 * length because we are creating new directory
420 if (dir->namelen % 4 != 0)
421 padding_factor = 4 - (dir->namelen % 4);
423 last_entry_dirlen = dir->namelen +
424 sizeof(struct ext2_dirent) + padding_factor;
425 if ((fs->blksz - totalbytes - last_entry_dirlen) <
426 new_entry_byte_reqd) {
427 printf("1st Block Full:Allocate new block\n");
429 if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
430 printf("Directory exceeds limit\n");
433 g_parent_inode->b.blocks.dir_blocks
434 [direct_blk_idx] = ext4fs_get_new_blk_no();
435 if (g_parent_inode->b.blocks.dir_blocks
436 [direct_blk_idx] == -1) {
437 printf("no block left to assign\n");
441 ((uint64_t)g_parent_inode->b.
442 blocks.dir_blocks[direct_blk_idx] *
443 (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
444 g_parent_inode->size =
445 g_parent_inode->size + fs->blksz;
446 g_parent_inode->blockcnt =
447 g_parent_inode->blockcnt + fs->sect_perblk;
448 if (ext4fs_put_metadata
449 (root_first_block_buffer,
450 first_block_no_of_root))
454 dir->direntlen = last_entry_dirlen;
458 templength = dir->direntlen;
459 totalbytes = totalbytes + templength;
460 sizeof_void_space = check_void_in_dentry(dir, filename);
461 if (sizeof_void_space)
464 dir = (struct ext2_dirent *)((char *)dir + templength);
467 /* make a pointer ready for creating next directory entry */
468 templength = dir->direntlen;
469 totalbytes = totalbytes + templength;
470 dir = (struct ext2_dirent *)((char *)dir + templength);
472 /* get the next available inode number */
473 inodeno = ext4fs_get_new_inode_no();
475 printf("no inode left to assign\n");
478 dir->inode = inodeno;
479 if (sizeof_void_space)
480 dir->direntlen = sizeof_void_space;
482 dir->direntlen = fs->blksz - totalbytes;
484 dir->namelen = strlen(filename);
485 dir->filetype = FILETYPE_REG; /* regular file */
486 temp_dir = (char *)dir;
487 temp_dir = temp_dir + sizeof(struct ext2_dirent);
488 memcpy(temp_dir, filename, strlen(filename));
492 /* update or write the 1st block of root inode */
493 if (ext4fs_put_metadata(root_first_block_buffer,
494 first_block_no_of_root))
499 free(root_first_block_buffer);
502 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
512 unsigned char *block_buffer = NULL;
513 struct ext2_dirent *dir = NULL;
514 struct ext2_dirent *previous_dir = NULL;
515 struct ext_filesystem *fs = get_fs();
517 /* read the block no allocated to a file */
518 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
520 blknr = read_allocated_block(parent_inode, direct_blk_idx);
524 /* read the blocks of parenet inode */
525 block_buffer = zalloc(fs->blksz);
529 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
530 0, fs->blksz, (char *)block_buffer);
534 dir = (struct ext2_dirent *)block_buffer;
537 while (dir->direntlen >= 0) {
539 * blocksize-totalbytes because last directory
540 * length i.e.,*dir->direntlen is free availble
541 * space in the block that means
542 * it is a last entry of directory entry
544 if (strlen(dirname) == dir->namelen) {
545 if (strncmp(dirname, ptr +
546 sizeof(struct ext2_dirent),
547 dir->namelen) == 0) {
548 previous_dir->direntlen +=
550 inodeno = dir->inode;
557 if (fs->blksz - totalbytes == dir->direntlen)
560 /* traversing the each directory entry */
561 templength = dir->direntlen;
562 totalbytes = totalbytes + templength;
564 dir = (struct ext2_dirent *)((char *)dir + templength);
584 static int find_dir_depth(char *dirname)
586 char *token = strtok(dirname, "/");
588 while (token != NULL) {
589 token = strtok(NULL, "/");
592 return count + 1 + 1;
594 * for example for string /home/temp
595 * depth=home(1)+temp(1)+1 extra for NULL;
600 static int parse_path(char **arr, char *dirname)
602 char *token = strtok(dirname, "/");
606 arr[i] = zalloc(strlen("/") + 1);
609 memcpy(arr[i++], "/", strlen("/"));
611 /* add each path entry after root */
612 while (token != NULL) {
613 arr[i] = zalloc(strlen(token) + 1);
616 memcpy(arr[i++], token, strlen(token));
617 token = strtok(NULL, "/");
624 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
626 if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
633 * Function: ext4fs_get_parent_inode_num
634 * Return Value: inode Number of the parent directory of file/Directory to be
636 * dirname : Input parmater, input path name of the file/directory to be created
637 * dname : Output parameter, to be filled with the name of the directory
638 * extracted from dirname
640 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
644 int matched_inode_no;
645 int result_inode_no = -1;
647 char *depth_dirname = NULL;
648 char *parse_dirname = NULL;
649 struct ext2_inode *parent_inode = NULL;
650 struct ext2_inode *first_inode = NULL;
651 struct ext2_inode temp_inode;
653 if (*dirname != '/') {
654 printf("Please supply Absolute path\n");
658 /* TODO: input validation make equivalent to linux */
659 depth_dirname = zalloc(strlen(dirname) + 1);
663 memcpy(depth_dirname, dirname, strlen(dirname));
664 depth = find_dir_depth(depth_dirname);
665 parse_dirname = zalloc(strlen(dirname) + 1);
668 memcpy(parse_dirname, dirname, strlen(dirname));
670 /* allocate memory for each directory level */
671 ptr = zalloc((depth) * sizeof(char *));
674 if (parse_path(ptr, parse_dirname))
676 parent_inode = zalloc(sizeof(struct ext2_inode));
679 first_inode = zalloc(sizeof(struct ext2_inode));
682 memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
683 memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
685 result_inode_no = EXT2_ROOT_INO;
686 for (i = 1; i < depth; i++) {
687 matched_inode_no = search_dir(parent_inode, ptr[i]);
688 if (matched_inode_no == -1) {
689 if (ptr[i + 1] == NULL && i == 1) {
690 result_inode_no = EXT2_ROOT_INO;
693 if (ptr[i + 1] == NULL)
695 printf("Invalid path\n");
696 result_inode_no = -1;
700 if (ptr[i + 1] != NULL) {
701 memset(parent_inode, '\0',
702 sizeof(struct ext2_inode));
703 if (ext4fs_iget(matched_inode_no,
705 result_inode_no = -1;
708 result_inode_no = matched_inode_no;
717 matched_inode_no = search_dir(first_inode, ptr[i]);
719 matched_inode_no = search_dir(parent_inode, ptr[i]);
721 if (matched_inode_no != -1) {
722 ext4fs_iget(matched_inode_no, &temp_inode);
723 if (temp_inode.mode & S_IFDIR) {
724 printf("It is a Directory\n");
725 result_inode_no = -1;
730 if (strlen(ptr[i]) > 256) {
731 result_inode_no = -1;
734 memcpy(dname, ptr[i], strlen(ptr[i]));
739 for (i = 0; i < depth; i++) {
748 return result_inode_no;
751 static int check_filename(char *filename, unsigned int blknr)
753 unsigned int first_block_no_of_root;
758 char *root_first_block_buffer = NULL;
759 char *root_first_block_addr = NULL;
760 struct ext2_dirent *dir = NULL;
761 struct ext2_dirent *previous_dir = NULL;
763 struct ext_filesystem *fs = get_fs();
766 /* get the first block of root */
767 first_block_no_of_root = blknr;
768 root_first_block_buffer = zalloc(fs->blksz);
769 if (!root_first_block_buffer)
771 root_first_block_addr = root_first_block_buffer;
772 status = ext4fs_devread((lbaint_t)first_block_no_of_root *
774 fs->blksz, root_first_block_buffer);
778 if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
780 dir = (struct ext2_dirent *)root_first_block_buffer;
783 while (dir->direntlen >= 0) {
785 * blocksize-totalbytes because last
786 * directory length i.e., *dir->direntlen
787 * is free availble space in the block that
788 * means it is a last entry of directory entry
790 if (strlen(filename) == dir->namelen) {
791 if (strncmp(filename, ptr + sizeof(struct ext2_dirent),
792 dir->namelen) == 0) {
793 printf("file found deleting\n");
794 previous_dir->direntlen += dir->direntlen;
795 inodeno = dir->inode;
802 if (fs->blksz - totalbytes == dir->direntlen)
805 /* traversing the each directory entry */
806 templength = dir->direntlen;
807 totalbytes = totalbytes + templength;
809 dir = (struct ext2_dirent *)((char *)dir + templength);
815 if (ext4fs_put_metadata(root_first_block_addr,
816 first_block_no_of_root))
821 free(root_first_block_buffer);
826 int ext4fs_filename_check(char *filename)
828 short direct_blk_idx = 0;
832 /* read the block no allocated to a file */
833 for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
835 blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
838 inodeno = check_filename(filename, blknr);
846 long int ext4fs_get_new_blk_no(void)
852 static int prev_bg_bitmap_index = -1;
853 unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
854 struct ext_filesystem *fs = get_fs();
855 char *journal_buffer = zalloc(fs->blksz);
856 char *zero_buffer = zalloc(fs->blksz);
857 if (!journal_buffer || !zero_buffer)
859 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
861 if (fs->first_pass_bbmap == 0) {
862 for (i = 0; i < fs->no_blkgrp; i++) {
863 if (bgd[i].free_blocks) {
864 if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) {
865 put_ext4(((uint64_t) ((uint64_t)bgd[i].block_id *
866 (uint64_t)fs->blksz)),
867 zero_buffer, fs->blksz);
870 bg_flags & ~EXT4_BG_BLOCK_UNINIT;
871 memcpy(fs->blk_bmaps[i], zero_buffer,
875 _get_new_blk_no(fs->blk_bmaps[i]);
876 if (fs->curr_blkno == -1)
877 /* if block bitmap is completely fill */
879 fs->curr_blkno = fs->curr_blkno +
881 fs->first_pass_bbmap++;
882 bgd[i].free_blocks--;
883 fs->sb->free_blocks--;
884 status = ext4fs_devread((lbaint_t)
891 if (ext4fs_log_journal(journal_buffer,
896 debug("no space left on block group %d\n", i);
904 /* get the blockbitmap index respective to blockno */
905 bg_idx = fs->curr_blkno / blk_per_grp;
906 if (fs->blksz == 1024) {
907 remainder = fs->curr_blkno % blk_per_grp;
913 * To skip completely filled block group bitmaps
914 * Optimize the block allocation
916 if (bg_idx >= fs->no_blkgrp)
919 if (bgd[bg_idx].free_blocks == 0) {
920 debug("block group %u is full. Skipping\n", bg_idx);
921 fs->curr_blkno = fs->curr_blkno + blk_per_grp;
926 if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
927 memset(zero_buffer, '\0', fs->blksz);
928 put_ext4(((uint64_t) ((uint64_t)bgd[bg_idx].block_id *
929 (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
930 memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
931 bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags &
932 ~EXT4_BG_BLOCK_UNINIT;
935 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
937 debug("going for restart for the block no %ld %u\n",
938 fs->curr_blkno, bg_idx);
943 if (prev_bg_bitmap_index != bg_idx) {
944 memset(journal_buffer, '\0', fs->blksz);
945 status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id
947 0, fs->blksz, journal_buffer);
950 if (ext4fs_log_journal(journal_buffer,
951 bgd[bg_idx].block_id))
954 prev_bg_bitmap_index = bg_idx;
956 bgd[bg_idx].free_blocks--;
957 fs->sb->free_blocks--;
961 free(journal_buffer);
964 return fs->curr_blkno;
966 free(journal_buffer);
972 int ext4fs_get_new_inode_no(void)
976 unsigned int ibmap_idx;
977 static int prev_inode_bitmap_index = -1;
978 unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
979 struct ext_filesystem *fs = get_fs();
980 char *journal_buffer = zalloc(fs->blksz);
981 char *zero_buffer = zalloc(fs->blksz);
982 if (!journal_buffer || !zero_buffer)
984 struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
986 if (fs->first_pass_ibmap == 0) {
987 for (i = 0; i < fs->no_blkgrp; i++) {
988 if (bgd[i].free_inodes) {
989 if (bgd[i].bg_itable_unused !=
991 bgd[i].bg_itable_unused =
993 if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
995 ((uint64_t)bgd[i].inode_id *
996 (uint64_t)fs->blksz)),
997 zero_buffer, fs->blksz);
998 bgd[i].bg_flags = bgd[i].bg_flags &
999 ~EXT4_BG_INODE_UNINIT;
1000 memcpy(fs->inode_bmaps[i],
1001 zero_buffer, fs->blksz);
1004 _get_new_inode_no(fs->inode_bmaps[i]);
1005 if (fs->curr_inode_no == -1)
1006 /* if block bitmap is completely fill */
1008 fs->curr_inode_no = fs->curr_inode_no +
1009 (i * inodes_per_grp);
1010 fs->first_pass_ibmap++;
1011 bgd[i].free_inodes--;
1012 bgd[i].bg_itable_unused--;
1013 fs->sb->free_inodes--;
1014 status = ext4fs_devread((lbaint_t)
1021 if (ext4fs_log_journal(journal_buffer,
1026 debug("no inode left on block group %d\n", i);
1031 fs->curr_inode_no++;
1032 /* get the blockbitmap index respective to blockno */
1033 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1034 if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
1035 memset(zero_buffer, '\0', fs->blksz);
1036 put_ext4(((uint64_t) ((uint64_t)bgd[ibmap_idx].inode_id *
1037 (uint64_t)fs->blksz)), zero_buffer,
1039 bgd[ibmap_idx].bg_flags =
1040 bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
1041 memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1045 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1046 fs->inode_bmaps[ibmap_idx],
1048 debug("going for restart for the block no %d %u\n",
1049 fs->curr_inode_no, ibmap_idx);
1053 /* journal backup */
1054 if (prev_inode_bitmap_index != ibmap_idx) {
1055 memset(journal_buffer, '\0', fs->blksz);
1056 status = ext4fs_devread((lbaint_t)
1057 bgd[ibmap_idx].inode_id
1059 0, fs->blksz, journal_buffer);
1062 if (ext4fs_log_journal(journal_buffer,
1063 bgd[ibmap_idx].inode_id))
1065 prev_inode_bitmap_index = ibmap_idx;
1067 if (bgd[ibmap_idx].bg_itable_unused !=
1068 bgd[ibmap_idx].free_inodes)
1069 bgd[ibmap_idx].bg_itable_unused =
1070 bgd[ibmap_idx].free_inodes;
1071 bgd[ibmap_idx].free_inodes--;
1072 bgd[ibmap_idx].bg_itable_unused--;
1073 fs->sb->free_inodes--;
1078 free(journal_buffer);
1081 return fs->curr_inode_no;
1083 free(journal_buffer);
1091 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1092 unsigned int *total_remaining_blocks,
1093 unsigned int *no_blks_reqd)
1097 long int actual_block_no;
1098 long int si_blockno;
1099 /* si :single indirect */
1100 unsigned int *si_buffer = NULL;
1101 unsigned int *si_start_addr = NULL;
1102 struct ext_filesystem *fs = get_fs();
1104 if (*total_remaining_blocks != 0) {
1105 si_buffer = zalloc(fs->blksz);
1107 printf("No Memory\n");
1110 si_start_addr = si_buffer;
1111 si_blockno = ext4fs_get_new_blk_no();
1112 if (si_blockno == -1) {
1113 printf("no block left to assign\n");
1117 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1119 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1120 0, fs->blksz, (char *)si_buffer);
1121 memset(si_buffer, '\0', fs->blksz);
1125 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1126 actual_block_no = ext4fs_get_new_blk_no();
1127 if (actual_block_no == -1) {
1128 printf("no block left to assign\n");
1131 *si_buffer = actual_block_no;
1132 debug("SIAB %u: %u\n", *si_buffer,
1133 *total_remaining_blocks);
1136 (*total_remaining_blocks)--;
1137 if (*total_remaining_blocks == 0)
1141 /* write the block to disk */
1142 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1143 si_start_addr, fs->blksz);
1144 file_inode->b.blocks.indir_block = si_blockno;
1147 free(si_start_addr);
1150 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1151 unsigned int *total_remaining_blocks,
1152 unsigned int *no_blks_reqd)
1157 long int actual_block_no;
1158 /* di:double indirect */
1159 long int di_blockno_parent;
1160 long int di_blockno_child;
1161 unsigned int *di_parent_buffer = NULL;
1162 unsigned int *di_child_buff = NULL;
1163 unsigned int *di_block_start_addr = NULL;
1164 unsigned int *di_child_buff_start = NULL;
1165 struct ext_filesystem *fs = get_fs();
1167 if (*total_remaining_blocks != 0) {
1168 /* double indirect parent block connecting to inode */
1169 di_blockno_parent = ext4fs_get_new_blk_no();
1170 if (di_blockno_parent == -1) {
1171 printf("no block left to assign\n");
1174 di_parent_buffer = zalloc(fs->blksz);
1175 if (!di_parent_buffer)
1178 di_block_start_addr = di_parent_buffer;
1180 debug("DIPB %ld: %u\n", di_blockno_parent,
1181 *total_remaining_blocks);
1183 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1185 fs->blksz, (char *)di_parent_buffer);
1188 printf("%s: Device read error!\n", __func__);
1191 memset(di_parent_buffer, '\0', fs->blksz);
1194 * start:for each double indirect parent
1195 * block create one more block
1197 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1198 di_blockno_child = ext4fs_get_new_blk_no();
1199 if (di_blockno_child == -1) {
1200 printf("no block left to assign\n");
1203 di_child_buff = zalloc(fs->blksz);
1207 di_child_buff_start = di_child_buff;
1208 *di_parent_buffer = di_blockno_child;
1211 debug("DICB %ld: %u\n", di_blockno_child,
1212 *total_remaining_blocks);
1214 status = ext4fs_devread((lbaint_t)di_blockno_child *
1217 (char *)di_child_buff);
1220 printf("%s: Device read error!\n", __func__);
1223 memset(di_child_buff, '\0', fs->blksz);
1224 /* filling of actual datablocks for each child */
1225 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1226 actual_block_no = ext4fs_get_new_blk_no();
1227 if (actual_block_no == -1) {
1228 printf("no block left to assign\n");
1231 *di_child_buff = actual_block_no;
1232 debug("DIAB %ld: %u\n", actual_block_no,
1233 *total_remaining_blocks);
1236 (*total_remaining_blocks)--;
1237 if (*total_remaining_blocks == 0)
1240 /* write the block table */
1241 put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1242 di_child_buff_start, fs->blksz);
1243 free(di_child_buff_start);
1244 di_child_buff_start = NULL;
1246 if (*total_remaining_blocks == 0)
1249 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1250 di_block_start_addr, fs->blksz);
1251 file_inode->b.blocks.double_indir_block = di_blockno_parent;
1254 free(di_block_start_addr);
1257 static void alloc_triple_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 /* ti: Triple Indirect */
1266 long int ti_gp_blockno;
1267 long int ti_parent_blockno;
1268 long int ti_child_blockno;
1269 unsigned int *ti_gp_buff = NULL;
1270 unsigned int *ti_parent_buff = NULL;
1271 unsigned int *ti_child_buff = NULL;
1272 unsigned int *ti_gp_buff_start_addr = NULL;
1273 unsigned int *ti_pbuff_start_addr = NULL;
1274 unsigned int *ti_cbuff_start_addr = NULL;
1275 struct ext_filesystem *fs = get_fs();
1276 if (*total_remaining_blocks != 0) {
1277 /* triple indirect grand parent block connecting to inode */
1278 ti_gp_blockno = ext4fs_get_new_blk_no();
1279 if (ti_gp_blockno == -1) {
1280 printf("no block left to assign\n");
1283 ti_gp_buff = zalloc(fs->blksz);
1287 ti_gp_buff_start_addr = ti_gp_buff;
1289 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1290 *total_remaining_blocks);
1292 /* for each 4 byte grand parent entry create one more block */
1293 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1294 ti_parent_blockno = ext4fs_get_new_blk_no();
1295 if (ti_parent_blockno == -1) {
1296 printf("no block left to assign\n");
1299 ti_parent_buff = zalloc(fs->blksz);
1300 if (!ti_parent_buff)
1303 ti_pbuff_start_addr = ti_parent_buff;
1304 *ti_gp_buff = ti_parent_blockno;
1307 debug("TIPB %ld: %u\n", ti_parent_blockno,
1308 *total_remaining_blocks);
1310 /* for each 4 byte entry parent create one more block */
1311 for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1312 ti_child_blockno = ext4fs_get_new_blk_no();
1313 if (ti_child_blockno == -1) {
1314 printf("no block left assign\n");
1317 ti_child_buff = zalloc(fs->blksz);
1321 ti_cbuff_start_addr = ti_child_buff;
1322 *ti_parent_buff = ti_child_blockno;
1325 debug("TICB %ld: %u\n", ti_parent_blockno,
1326 *total_remaining_blocks);
1328 /* fill actual datablocks for each child */
1329 for (k = 0; k < (fs->blksz / sizeof(int));
1332 ext4fs_get_new_blk_no();
1333 if (actual_block_no == -1) {
1334 printf("no block left\n");
1335 free(ti_cbuff_start_addr);
1338 *ti_child_buff = actual_block_no;
1339 debug("TIAB %ld: %u\n", actual_block_no,
1340 *total_remaining_blocks);
1343 (*total_remaining_blocks)--;
1344 if (*total_remaining_blocks == 0)
1347 /* write the child block */
1348 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1349 (uint64_t)fs->blksz)),
1350 ti_cbuff_start_addr, fs->blksz);
1351 free(ti_cbuff_start_addr);
1353 if (*total_remaining_blocks == 0)
1356 /* write the parent block */
1357 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1358 ti_pbuff_start_addr, fs->blksz);
1359 free(ti_pbuff_start_addr);
1361 if (*total_remaining_blocks == 0)
1364 /* write the grand parent block */
1365 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1366 ti_gp_buff_start_addr, fs->blksz);
1367 file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
1368 free(ti_gp_buff_start_addr);
1372 free(ti_pbuff_start_addr);
1374 free(ti_gp_buff_start_addr);
1377 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1378 unsigned int total_remaining_blocks,
1379 unsigned int *total_no_of_block)
1382 long int direct_blockno;
1383 unsigned int no_blks_reqd = 0;
1385 /* allocation of direct blocks */
1386 for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1387 direct_blockno = ext4fs_get_new_blk_no();
1388 if (direct_blockno == -1) {
1389 printf("no block left to assign\n");
1392 file_inode->b.blocks.dir_blocks[i] = direct_blockno;
1393 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1395 total_remaining_blocks--;
1398 alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1400 alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1402 alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1404 *total_no_of_block += no_blks_reqd;
1409 static struct ext4_extent_header *ext4fs_get_extent_block
1410 (struct ext2_data *data, char *buf,
1411 struct ext4_extent_header *ext_block,
1412 uint32_t fileblock, int log2_blksz)
1414 struct ext4_extent_idx *index;
1415 unsigned long long block;
1416 int blksz = EXT2_BLOCK_SIZE(data);
1420 index = (struct ext4_extent_idx *)(ext_block + 1);
1422 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1425 if (ext_block->eh_depth == 0)
1430 if (i >= le16_to_cpu(ext_block->eh_entries))
1432 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1437 block = le16_to_cpu(index[i].ei_leaf_hi);
1438 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1440 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1442 ext_block = (struct ext4_extent_header *)buf;
1448 static int ext4fs_blockgroup
1449 (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1452 unsigned int blkoff, desc_per_blk;
1453 int log2blksz = get_fs()->dev_desc->log2blksz;
1455 desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1457 blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1458 group / desc_per_blk;
1459 blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1461 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1462 group, blkno, blkoff);
1464 return ext4fs_devread((lbaint_t)blkno <<
1465 (LOG2_BLOCK_SIZE(data) - log2blksz),
1466 blkoff, sizeof(struct ext2_block_group),
1470 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1472 struct ext2_block_group blkgrp;
1473 struct ext2_sblock *sblock = &data->sblock;
1474 struct ext_filesystem *fs = get_fs();
1475 int log2blksz = get_fs()->dev_desc->log2blksz;
1476 int inodes_per_block, status;
1478 unsigned int blkoff;
1480 /* It is easier to calculate if the first inode is 0. */
1482 status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1483 (sblock->inodes_per_group), &blkgrp);
1487 inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1488 blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1489 (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1490 blkoff = (ino % inodes_per_block) * fs->inodesz;
1491 /* Read the inode. */
1492 status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1494 sizeof(struct ext2_inode), (char *)inode);
1501 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1508 long int perblock_parent;
1509 long int perblock_child;
1510 unsigned long long start;
1511 /* get the blocksize of the filesystem */
1512 blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1513 log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1514 - get_fs()->dev_desc->log2blksz;
1516 if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1517 char *buf = zalloc(blksz);
1520 struct ext4_extent_header *ext_block;
1521 struct ext4_extent *extent;
1524 ext4fs_get_extent_block(ext4fs_root, buf,
1525 (struct ext4_extent_header *)
1526 inode->b.blocks.dir_blocks,
1527 fileblock, log2_blksz);
1529 printf("invalid extent block\n");
1534 extent = (struct ext4_extent *)(ext_block + 1);
1538 if (i >= le16_to_cpu(ext_block->eh_entries))
1540 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1542 fileblock -= le32_to_cpu(extent[i].ee_block);
1543 if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1548 start = le16_to_cpu(extent[i].ee_start_hi);
1549 start = (start << 32) +
1550 le32_to_cpu(extent[i].ee_start_lo);
1552 return fileblock + start;
1555 printf("Extent Error\n");
1560 /* Direct blocks. */
1561 if (fileblock < INDIRECT_BLOCKS)
1562 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1565 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1566 if (ext4fs_indir1_block == NULL) {
1567 ext4fs_indir1_block = zalloc(blksz);
1568 if (ext4fs_indir1_block == NULL) {
1569 printf("** SI ext2fs read block (indir 1)"
1570 "malloc failed. **\n");
1573 ext4fs_indir1_size = blksz;
1574 ext4fs_indir1_blkno = -1;
1576 if (blksz != ext4fs_indir1_size) {
1577 free(ext4fs_indir1_block);
1578 ext4fs_indir1_block = NULL;
1579 ext4fs_indir1_size = 0;
1580 ext4fs_indir1_blkno = -1;
1581 ext4fs_indir1_block = zalloc(blksz);
1582 if (ext4fs_indir1_block == NULL) {
1583 printf("** SI ext2fs read block (indir 1):"
1584 "malloc failed. **\n");
1587 ext4fs_indir1_size = blksz;
1589 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1590 log2_blksz) != ext4fs_indir1_blkno) {
1592 ext4fs_devread((lbaint_t)__le32_to_cpu
1594 indir_block) << log2_blksz, 0,
1595 blksz, (char *)ext4fs_indir1_block);
1597 printf("** SI ext2fs read block (indir 1)"
1601 ext4fs_indir1_blkno =
1602 __le32_to_cpu(inode->b.blocks.
1603 indir_block) << log2_blksz;
1605 blknr = __le32_to_cpu(ext4fs_indir1_block
1606 [fileblock - INDIRECT_BLOCKS]);
1608 /* Double indirect. */
1609 else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1610 (blksz / 4 + 1)))) {
1612 long int perblock = blksz / 4;
1613 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1615 if (ext4fs_indir1_block == NULL) {
1616 ext4fs_indir1_block = zalloc(blksz);
1617 if (ext4fs_indir1_block == NULL) {
1618 printf("** DI ext2fs read block (indir 2 1)"
1619 "malloc failed. **\n");
1622 ext4fs_indir1_size = blksz;
1623 ext4fs_indir1_blkno = -1;
1625 if (blksz != ext4fs_indir1_size) {
1626 free(ext4fs_indir1_block);
1627 ext4fs_indir1_block = NULL;
1628 ext4fs_indir1_size = 0;
1629 ext4fs_indir1_blkno = -1;
1630 ext4fs_indir1_block = zalloc(blksz);
1631 if (ext4fs_indir1_block == NULL) {
1632 printf("** DI ext2fs read block (indir 2 1)"
1633 "malloc failed. **\n");
1636 ext4fs_indir1_size = blksz;
1638 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1639 log2_blksz) != ext4fs_indir1_blkno) {
1641 ext4fs_devread((lbaint_t)__le32_to_cpu
1643 double_indir_block) << log2_blksz,
1645 (char *)ext4fs_indir1_block);
1647 printf("** DI ext2fs read block (indir 2 1)"
1651 ext4fs_indir1_blkno =
1652 __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1656 if (ext4fs_indir2_block == NULL) {
1657 ext4fs_indir2_block = zalloc(blksz);
1658 if (ext4fs_indir2_block == NULL) {
1659 printf("** DI ext2fs read block (indir 2 2)"
1660 "malloc failed. **\n");
1663 ext4fs_indir2_size = blksz;
1664 ext4fs_indir2_blkno = -1;
1666 if (blksz != ext4fs_indir2_size) {
1667 free(ext4fs_indir2_block);
1668 ext4fs_indir2_block = NULL;
1669 ext4fs_indir2_size = 0;
1670 ext4fs_indir2_blkno = -1;
1671 ext4fs_indir2_block = zalloc(blksz);
1672 if (ext4fs_indir2_block == NULL) {
1673 printf("** DI ext2fs read block (indir 2 2)"
1674 "malloc failed. **\n");
1677 ext4fs_indir2_size = blksz;
1679 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1680 log2_blksz) != ext4fs_indir2_blkno) {
1681 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1682 (ext4fs_indir1_block
1684 perblock]) << log2_blksz, 0,
1686 (char *)ext4fs_indir2_block);
1688 printf("** DI ext2fs read block (indir 2 2)"
1692 ext4fs_indir2_blkno =
1693 __le32_to_cpu(ext4fs_indir1_block[rblock
1698 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1700 /* Tripple indirect. */
1702 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1703 (blksz / 4 * blksz / 4));
1704 perblock_child = blksz / 4;
1705 perblock_parent = ((blksz / 4) * (blksz / 4));
1707 if (ext4fs_indir1_block == NULL) {
1708 ext4fs_indir1_block = zalloc(blksz);
1709 if (ext4fs_indir1_block == NULL) {
1710 printf("** TI ext2fs read block (indir 2 1)"
1711 "malloc failed. **\n");
1714 ext4fs_indir1_size = blksz;
1715 ext4fs_indir1_blkno = -1;
1717 if (blksz != ext4fs_indir1_size) {
1718 free(ext4fs_indir1_block);
1719 ext4fs_indir1_block = NULL;
1720 ext4fs_indir1_size = 0;
1721 ext4fs_indir1_blkno = -1;
1722 ext4fs_indir1_block = zalloc(blksz);
1723 if (ext4fs_indir1_block == NULL) {
1724 printf("** TI ext2fs read block (indir 2 1)"
1725 "malloc failed. **\n");
1728 ext4fs_indir1_size = blksz;
1730 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1731 log2_blksz) != ext4fs_indir1_blkno) {
1732 status = ext4fs_devread
1734 __le32_to_cpu(inode->b.blocks.triple_indir_block)
1735 << log2_blksz, 0, blksz,
1736 (char *)ext4fs_indir1_block);
1738 printf("** TI ext2fs read block (indir 2 1)"
1742 ext4fs_indir1_blkno =
1743 __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1747 if (ext4fs_indir2_block == NULL) {
1748 ext4fs_indir2_block = zalloc(blksz);
1749 if (ext4fs_indir2_block == NULL) {
1750 printf("** TI ext2fs read block (indir 2 2)"
1751 "malloc failed. **\n");
1754 ext4fs_indir2_size = blksz;
1755 ext4fs_indir2_blkno = -1;
1757 if (blksz != ext4fs_indir2_size) {
1758 free(ext4fs_indir2_block);
1759 ext4fs_indir2_block = NULL;
1760 ext4fs_indir2_size = 0;
1761 ext4fs_indir2_blkno = -1;
1762 ext4fs_indir2_block = zalloc(blksz);
1763 if (ext4fs_indir2_block == NULL) {
1764 printf("** TI ext2fs read block (indir 2 2)"
1765 "malloc failed. **\n");
1768 ext4fs_indir2_size = blksz;
1770 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1771 perblock_parent]) <<
1773 != ext4fs_indir2_blkno) {
1774 status = ext4fs_devread((lbaint_t)__le32_to_cpu
1775 (ext4fs_indir1_block
1777 perblock_parent]) <<
1778 log2_blksz, 0, blksz,
1779 (char *)ext4fs_indir2_block);
1781 printf("** TI ext2fs read block (indir 2 2)"
1785 ext4fs_indir2_blkno =
1786 __le32_to_cpu(ext4fs_indir1_block[rblock /
1791 if (ext4fs_indir3_block == NULL) {
1792 ext4fs_indir3_block = zalloc(blksz);
1793 if (ext4fs_indir3_block == NULL) {
1794 printf("** TI ext2fs read block (indir 2 2)"
1795 "malloc failed. **\n");
1798 ext4fs_indir3_size = blksz;
1799 ext4fs_indir3_blkno = -1;
1801 if (blksz != ext4fs_indir3_size) {
1802 free(ext4fs_indir3_block);
1803 ext4fs_indir3_block = NULL;
1804 ext4fs_indir3_size = 0;
1805 ext4fs_indir3_blkno = -1;
1806 ext4fs_indir3_block = zalloc(blksz);
1807 if (ext4fs_indir3_block == NULL) {
1808 printf("** TI ext2fs read block (indir 2 2)"
1809 "malloc failed. **\n");
1812 ext4fs_indir3_size = blksz;
1814 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1817 log2_blksz) != ext4fs_indir3_blkno) {
1819 ext4fs_devread((lbaint_t)__le32_to_cpu
1820 (ext4fs_indir2_block
1821 [(rblock / perblock_child)
1822 % (blksz / 4)]) << log2_blksz, 0,
1823 blksz, (char *)ext4fs_indir3_block);
1825 printf("** TI ext2fs read block (indir 2 2)"
1829 ext4fs_indir3_blkno =
1830 __le32_to_cpu(ext4fs_indir2_block[(rblock /
1837 blknr = __le32_to_cpu(ext4fs_indir3_block
1838 [rblock % perblock_child]);
1840 debug("read_allocated_block %ld\n", blknr);
1846 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1849 * This function assures that for a file with the same name but different size
1850 * the sequential store on the ext4 filesystem will be correct.
1852 * In this function the global data, responsible for internal representation
1853 * of the ext4 data are initialized to the reset state. Without this, during
1854 * replacement of the smaller file with the bigger truncation of new file was
1857 void ext4fs_reinit_global(void)
1859 if (ext4fs_indir1_block != NULL) {
1860 free(ext4fs_indir1_block);
1861 ext4fs_indir1_block = NULL;
1862 ext4fs_indir1_size = 0;
1863 ext4fs_indir1_blkno = -1;
1865 if (ext4fs_indir2_block != NULL) {
1866 free(ext4fs_indir2_block);
1867 ext4fs_indir2_block = NULL;
1868 ext4fs_indir2_size = 0;
1869 ext4fs_indir2_blkno = -1;
1871 if (ext4fs_indir3_block != NULL) {
1872 free(ext4fs_indir3_block);
1873 ext4fs_indir3_block = NULL;
1874 ext4fs_indir3_size = 0;
1875 ext4fs_indir3_blkno = -1;
1878 void ext4fs_close(void)
1880 if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1881 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1884 if (ext4fs_root != NULL) {
1889 ext4fs_reinit_global();
1892 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1893 struct ext2fs_node **fnode, int *ftype)
1895 unsigned int fpos = 0;
1898 struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1902 printf("Iterate dir %s\n", name);
1903 #endif /* of DEBUG */
1904 if (!diro->inode_read) {
1905 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1909 /* Search the file. */
1910 while (fpos < __le32_to_cpu(diro->inode.size)) {
1911 struct ext2_dirent dirent;
1913 status = ext4fs_read_file(diro, fpos,
1914 sizeof(struct ext2_dirent),
1915 (char *)&dirent, &actread);
1919 if (dirent.direntlen == 0) {
1920 printf("Failed to iterate over directory %s\n", name);
1924 if (dirent.namelen != 0) {
1925 char filename[dirent.namelen + 1];
1926 struct ext2fs_node *fdiro;
1927 int type = FILETYPE_UNKNOWN;
1929 status = ext4fs_read_file(diro,
1931 sizeof(struct ext2_dirent),
1932 dirent.namelen, filename,
1937 fdiro = zalloc(sizeof(struct ext2fs_node));
1941 fdiro->data = diro->data;
1942 fdiro->ino = __le32_to_cpu(dirent.inode);
1944 filename[dirent.namelen] = '\0';
1946 if (dirent.filetype != FILETYPE_UNKNOWN) {
1947 fdiro->inode_read = 0;
1949 if (dirent.filetype == FILETYPE_DIRECTORY)
1950 type = FILETYPE_DIRECTORY;
1951 else if (dirent.filetype == FILETYPE_SYMLINK)
1952 type = FILETYPE_SYMLINK;
1953 else if (dirent.filetype == FILETYPE_REG)
1954 type = FILETYPE_REG;
1956 status = ext4fs_read_inode(diro->data,
1964 fdiro->inode_read = 1;
1966 if ((__le16_to_cpu(fdiro->inode.mode) &
1967 FILETYPE_INO_MASK) ==
1968 FILETYPE_INO_DIRECTORY) {
1969 type = FILETYPE_DIRECTORY;
1970 } else if ((__le16_to_cpu(fdiro->inode.mode)
1971 & FILETYPE_INO_MASK) ==
1972 FILETYPE_INO_SYMLINK) {
1973 type = FILETYPE_SYMLINK;
1974 } else if ((__le16_to_cpu(fdiro->inode.mode)
1975 & FILETYPE_INO_MASK) ==
1977 type = FILETYPE_REG;
1981 printf("iterate >%s<\n", filename);
1982 #endif /* of DEBUG */
1983 if ((name != NULL) && (fnode != NULL)
1984 && (ftype != NULL)) {
1985 if (strcmp(filename, name) == 0) {
1991 if (fdiro->inode_read == 0) {
1992 status = ext4fs_read_inode(diro->data,
2000 fdiro->inode_read = 1;
2003 case FILETYPE_DIRECTORY:
2006 case FILETYPE_SYMLINK:
2017 __le32_to_cpu(fdiro->inode.size),
2022 fpos += __le16_to_cpu(dirent.direntlen);
2027 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2030 struct ext2fs_node *diro = node;
2034 if (!diro->inode_read) {
2035 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2039 symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2043 if (__le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2044 strncpy(symlink, diro->inode.b.symlink,
2045 __le32_to_cpu(diro->inode.size));
2047 status = ext4fs_read_file(diro, 0,
2048 __le32_to_cpu(diro->inode.size),
2050 if ((status < 0) || (actread == 0)) {
2055 symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2059 static int ext4fs_find_file1(const char *currpath,
2060 struct ext2fs_node *currroot,
2061 struct ext2fs_node **currfound, int *foundtype)
2063 char fpath[strlen(currpath) + 1];
2067 int type = FILETYPE_DIRECTORY;
2068 struct ext2fs_node *currnode = currroot;
2069 struct ext2fs_node *oldnode = currroot;
2071 strncpy(fpath, currpath, strlen(currpath) + 1);
2073 /* Remove all leading slashes. */
2074 while (*name == '/')
2078 *currfound = currnode;
2085 /* Extract the actual part from the pathname. */
2086 next = strchr(name, '/');
2088 /* Remove all leading slashes. */
2089 while (*next == '/')
2093 if (type != FILETYPE_DIRECTORY) {
2094 ext4fs_free_node(currnode, currroot);
2100 /* Iterate over the directory. */
2101 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2108 /* Read in the symlink and follow it. */
2109 if (type == FILETYPE_SYMLINK) {
2112 /* Test if the symlink does not loop. */
2113 if (++symlinknest == 8) {
2114 ext4fs_free_node(currnode, currroot);
2115 ext4fs_free_node(oldnode, currroot);
2119 symlink = ext4fs_read_symlink(currnode);
2120 ext4fs_free_node(currnode, currroot);
2123 ext4fs_free_node(oldnode, currroot);
2127 debug("Got symlink >%s<\n", symlink);
2129 if (symlink[0] == '/') {
2130 ext4fs_free_node(oldnode, currroot);
2131 oldnode = &ext4fs_root->diropen;
2134 /* Lookup the node the symlink points to. */
2135 status = ext4fs_find_file1(symlink, oldnode,
2141 ext4fs_free_node(oldnode, currroot);
2146 ext4fs_free_node(oldnode, currroot);
2148 /* Found the node! */
2149 if (!next || *next == '\0') {
2150 *currfound = currnode;
2159 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2160 struct ext2fs_node **foundnode, int expecttype)
2163 int foundtype = FILETYPE_DIRECTORY;
2169 status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2173 /* Check if the node that was found was of the expected type. */
2174 if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2176 else if ((expecttype == FILETYPE_DIRECTORY)
2177 && (foundtype != expecttype))
2183 int ext4fs_open(const char *filename, loff_t *len)
2185 struct ext2fs_node *fdiro = NULL;
2188 if (ext4fs_root == NULL)
2192 status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2197 if (!fdiro->inode_read) {
2198 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2203 *len = __le32_to_cpu(fdiro->inode.size);
2204 ext4fs_file = fdiro;
2208 ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2213 int ext4fs_mount(unsigned part_length)
2215 struct ext2_data *data;
2217 struct ext_filesystem *fs = get_fs();
2218 data = zalloc(SUPERBLOCK_SIZE);
2222 /* Read the superblock. */
2223 status = ext4_read_superblock((char *)&data->sblock);
2228 /* Make sure this is an ext2 filesystem. */
2229 if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2233 * The 64bit feature was enabled when metadata_csum was enabled
2234 * and we do not support metadata_csum (and cannot reliably find
2235 * files when it is set. Refuse to mount.
2237 if (data->sblock.feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) {
2238 printf("Unsupported feature found (64bit, possibly metadata_csum), not mounting\n");
2242 if (__le32_to_cpu(data->sblock.revision_level == 0))
2245 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2247 debug("EXT2 rev %d, inode_size %d\n",
2248 __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2250 data->diropen.data = data;
2251 data->diropen.ino = 2;
2252 data->diropen.inode_read = 1;
2253 data->inode = &data->diropen.inode;
2255 status = ext4fs_read_inode(data, 2, data->inode);
2263 printf("Failed to mount ext2 filesystem...\n");