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 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <ext_common.h>
39 #include <linux/stat.h>
40 #include <linux/time.h>
41 #include <asm/byteorder.h>
42 #include "ext4_common.h"
44 struct ext2_data
*ext4fs_root
;
45 struct ext2fs_node
*ext4fs_file
;
46 uint32_t *ext4fs_indir1_block
;
47 int ext4fs_indir1_size
;
48 int ext4fs_indir1_blkno
= -1;
49 uint32_t *ext4fs_indir2_block
;
50 int ext4fs_indir2_size
;
51 int ext4fs_indir2_blkno
= -1;
53 uint32_t *ext4fs_indir3_block
;
54 int ext4fs_indir3_size
;
55 int ext4fs_indir3_blkno
= -1;
56 struct ext2_inode
*g_parent_inode
;
57 static int symlinknest
;
59 #if defined(CONFIG_EXT4_WRITE)
60 uint32_t ext4fs_div_roundup(uint32_t size
, uint32_t n
)
62 uint32_t res
= size
/ n
;
69 void put_ext4(uint64_t off
, void *buf
, uint32_t size
)
73 unsigned char *temp_ptr
= NULL
;
74 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf
, SECTOR_SIZE
);
75 struct ext_filesystem
*fs
= get_fs();
77 startblock
= off
/ (uint64_t)SECTOR_SIZE
;
78 startblock
+= part_offset
;
79 remainder
= off
% (uint64_t)SECTOR_SIZE
;
80 remainder
&= SECTOR_SIZE
- 1;
82 if (fs
->dev_desc
== NULL
)
85 if ((startblock
+ (size
/ SECTOR_SIZE
)) >
86 (part_offset
+ fs
->total_sect
)) {
87 printf("part_offset is %lu\n", part_offset
);
88 printf("total_sector is %llu\n", fs
->total_sect
);
89 printf("error: overflow occurs\n");
94 if (fs
->dev_desc
->block_read
) {
95 fs
->dev_desc
->block_read(fs
->dev_desc
->dev
,
96 startblock
, 1, sec_buf
);
98 memcpy((temp_ptr
+ remainder
),
99 (unsigned char *)buf
, size
);
100 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
101 startblock
, 1, sec_buf
);
104 if (size
/ SECTOR_SIZE
!= 0) {
105 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
108 (unsigned long *)buf
);
110 fs
->dev_desc
->block_read(fs
->dev_desc
->dev
,
111 startblock
, 1, sec_buf
);
113 memcpy(temp_ptr
, buf
, size
);
114 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
116 (unsigned long *)sec_buf
);
121 static int _get_new_inode_no(unsigned char *buffer
)
123 struct ext_filesystem
*fs
= get_fs();
129 /* get the blocksize of the filesystem */
130 unsigned char *ptr
= buffer
;
131 while (*ptr
== 255) {
134 if (count
> ext4fs_root
->sblock
.inodes_per_group
)
138 for (j
= 0; j
< fs
->blksz
; j
++) {
143 status
= input
& operand
;
158 static int _get_new_blk_no(unsigned char *buffer
)
164 unsigned char *ptr
= buffer
;
165 struct ext_filesystem
*fs
= get_fs();
167 if (fs
->blksz
!= 1024)
172 while (*ptr
== 255) {
175 if (count
== (fs
->blksz
* 8))
179 for (j
= 0; j
< fs
->blksz
; j
++) {
184 status
= input
& operand
;
199 int ext4fs_set_block_bmap(long int blockno
, unsigned char *buffer
, int index
)
201 int i
, remainder
, status
;
202 unsigned char *ptr
= buffer
;
203 unsigned char operand
;
205 remainder
= blockno
% 8;
206 int blocksize
= EXT2_BLOCK_SIZE(ext4fs_root
);
208 i
= i
- (index
* blocksize
);
209 if (blocksize
!= 1024) {
211 operand
= 1 << remainder
;
212 status
= *ptr
& operand
;
216 *ptr
= *ptr
| operand
;
219 if (remainder
== 0) {
224 operand
= (1 << (remainder
- 1));
226 status
= *ptr
& operand
;
230 *ptr
= *ptr
| operand
;
235 void ext4fs_reset_block_bmap(long int blockno
, unsigned char *buffer
, int index
)
237 int i
, remainder
, status
;
238 unsigned char *ptr
= buffer
;
239 unsigned char operand
;
241 remainder
= blockno
% 8;
242 int blocksize
= EXT2_BLOCK_SIZE(ext4fs_root
);
244 i
= i
- (index
* blocksize
);
245 if (blocksize
!= 1024) {
247 operand
= (1 << remainder
);
248 status
= *ptr
& operand
;
250 *ptr
= *ptr
& ~(operand
);
252 if (remainder
== 0) {
257 operand
= (1 << (remainder
- 1));
259 status
= *ptr
& operand
;
261 *ptr
= *ptr
& ~(operand
);
265 int ext4fs_set_inode_bmap(int inode_no
, unsigned char *buffer
, int index
)
267 int i
, remainder
, status
;
268 unsigned char *ptr
= buffer
;
269 unsigned char operand
;
271 inode_no
-= (index
* ext4fs_root
->sblock
.inodes_per_group
);
273 remainder
= inode_no
% 8;
274 if (remainder
== 0) {
279 operand
= (1 << (remainder
- 1));
281 status
= *ptr
& operand
;
285 *ptr
= *ptr
| operand
;
290 void ext4fs_reset_inode_bmap(int inode_no
, unsigned char *buffer
, int index
)
292 int i
, remainder
, status
;
293 unsigned char *ptr
= buffer
;
294 unsigned char operand
;
296 inode_no
-= (index
* ext4fs_root
->sblock
.inodes_per_group
);
298 remainder
= inode_no
% 8;
299 if (remainder
== 0) {
304 operand
= (1 << (remainder
- 1));
306 status
= *ptr
& operand
;
308 *ptr
= *ptr
& ~(operand
);
311 int ext4fs_checksum_update(unsigned int i
)
313 struct ext2_block_group
*desc
;
314 struct ext_filesystem
*fs
= get_fs();
317 desc
= (struct ext2_block_group
*)&fs
->bgd
[i
];
318 if (fs
->sb
->feature_ro_compat
& EXT4_FEATURE_RO_COMPAT_GDT_CSUM
) {
319 int offset
= offsetof(struct ext2_block_group
, bg_checksum
);
321 crc
= ext2fs_crc16(~0, fs
->sb
->unique_id
,
322 sizeof(fs
->sb
->unique_id
));
323 crc
= ext2fs_crc16(crc
, &i
, sizeof(i
));
324 crc
= ext2fs_crc16(crc
, desc
, offset
);
325 offset
+= sizeof(desc
->bg_checksum
); /* skip checksum */
326 assert(offset
== sizeof(*desc
));
332 static int check_void_in_dentry(struct ext2_dirent
*dir
, char *filename
)
335 int sizeof_void_space
;
336 int new_entry_byte_reqd
;
337 short padding_factor
= 0;
339 if (dir
->namelen
% 4 != 0)
340 padding_factor
= 4 - (dir
->namelen
% 4);
342 dentry_length
= sizeof(struct ext2_dirent
) +
343 dir
->namelen
+ padding_factor
;
344 sizeof_void_space
= dir
->direntlen
- dentry_length
;
345 if (sizeof_void_space
== 0)
349 if (strlen(filename
) % 4 != 0)
350 padding_factor
= 4 - (strlen(filename
) % 4);
352 new_entry_byte_reqd
= strlen(filename
) +
353 sizeof(struct ext2_dirent
) + padding_factor
;
354 if (sizeof_void_space
>= new_entry_byte_reqd
) {
355 dir
->direntlen
= dentry_length
;
356 return sizeof_void_space
;
362 void ext4fs_update_parent_dentry(char *filename
, int *p_ino
, int file_type
)
364 unsigned int *zero_buffer
= NULL
;
365 char *root_first_block_buffer
= NULL
;
368 long int first_block_no_of_root
= 0;
369 long int previous_blknr
= -1;
371 short int padding_factor
= 0;
372 unsigned int new_entry_byte_reqd
;
373 unsigned int last_entry_dirlen
;
374 int sizeof_void_space
= 0;
378 struct ext_filesystem
*fs
= get_fs();
379 /* directory entry */
380 struct ext2_dirent
*dir
;
382 char *temp_dir
= NULL
;
384 zero_buffer
= zalloc(fs
->blksz
);
386 printf("No Memory\n");
389 root_first_block_buffer
= zalloc(fs
->blksz
);
390 if (!root_first_block_buffer
) {
392 printf("No Memory\n");
397 /* read the block no allocated to a file */
398 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
400 root_blknr
= read_allocated_block(g_parent_inode
,
402 if (root_blknr
== 0) {
403 first_block_no_of_root
= previous_blknr
;
406 previous_blknr
= root_blknr
;
409 status
= ext4fs_devread(first_block_no_of_root
411 0, fs
->blksz
, root_first_block_buffer
);
415 if (ext4fs_log_journal(root_first_block_buffer
, first_block_no_of_root
))
417 dir
= (struct ext2_dirent
*)root_first_block_buffer
;
420 while (dir
->direntlen
> 0) {
422 * blocksize-totalbytes because last directory length
423 * i.e. dir->direntlen is free availble space in the
424 * block that means it is a last entry of directory
428 /* traversing the each directory entry */
429 if (fs
->blksz
- totalbytes
== dir
->direntlen
) {
430 if (strlen(filename
) % 4 != 0)
431 padding_factor
= 4 - (strlen(filename
) % 4);
433 new_entry_byte_reqd
= strlen(filename
) +
434 sizeof(struct ext2_dirent
) + padding_factor
;
437 * update last directory entry length to its
438 * length because we are creating new directory
441 if (dir
->namelen
% 4 != 0)
442 padding_factor
= 4 - (dir
->namelen
% 4);
444 last_entry_dirlen
= dir
->namelen
+
445 sizeof(struct ext2_dirent
) + padding_factor
;
446 if ((fs
->blksz
- totalbytes
- last_entry_dirlen
) <
447 new_entry_byte_reqd
) {
448 printf("1st Block Full:Allocate new block\n");
450 if (direct_blk_idx
== INDIRECT_BLOCKS
- 1) {
451 printf("Directory exceeds limit\n");
454 g_parent_inode
->b
.blocks
.dir_blocks
455 [direct_blk_idx
] = ext4fs_get_new_blk_no();
456 if (g_parent_inode
->b
.blocks
.dir_blocks
457 [direct_blk_idx
] == -1) {
458 printf("no block left to assign\n");
463 blocks
.dir_blocks
[direct_blk_idx
] *
464 fs
->blksz
)), zero_buffer
, fs
->blksz
);
465 g_parent_inode
->size
=
466 g_parent_inode
->size
+ fs
->blksz
;
467 g_parent_inode
->blockcnt
=
468 g_parent_inode
->blockcnt
+ fs
->sect_perblk
;
469 if (ext4fs_put_metadata
470 (root_first_block_buffer
,
471 first_block_no_of_root
))
475 dir
->direntlen
= last_entry_dirlen
;
479 templength
= dir
->direntlen
;
480 totalbytes
= totalbytes
+ templength
;
481 sizeof_void_space
= check_void_in_dentry(dir
, filename
);
482 if (sizeof_void_space
)
485 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
489 /* make a pointer ready for creating next directory entry */
490 templength
= dir
->direntlen
;
491 totalbytes
= totalbytes
+ templength
;
492 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
495 /* get the next available inode number */
496 inodeno
= ext4fs_get_new_inode_no();
498 printf("no inode left to assign\n");
501 dir
->inode
= inodeno
;
502 if (sizeof_void_space
)
503 dir
->direntlen
= sizeof_void_space
;
505 dir
->direntlen
= fs
->blksz
- totalbytes
;
507 dir
->namelen
= strlen(filename
);
508 dir
->filetype
= FILETYPE_REG
; /* regular file */
509 temp_dir
= (char *)dir
;
510 temp_dir
= temp_dir
+ sizeof(struct ext2_dirent
);
511 memcpy(temp_dir
, filename
, strlen(filename
));
515 /* update or write the 1st block of root inode */
516 if (ext4fs_put_metadata(root_first_block_buffer
,
517 first_block_no_of_root
))
522 free(root_first_block_buffer
);
525 static int search_dir(struct ext2_inode
*parent_inode
, char *dirname
)
535 unsigned char *block_buffer
= NULL
;
536 struct ext2_dirent
*dir
= NULL
;
537 struct ext2_dirent
*previous_dir
= NULL
;
538 struct ext_filesystem
*fs
= get_fs();
540 /* read the block no allocated to a file */
541 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
543 blknr
= read_allocated_block(parent_inode
, direct_blk_idx
);
547 /* read the blocks of parenet inode */
548 block_buffer
= zalloc(fs
->blksz
);
552 status
= ext4fs_devread(blknr
* fs
->sect_perblk
,
553 0, fs
->blksz
, (char *)block_buffer
);
557 dir
= (struct ext2_dirent
*)block_buffer
;
560 while (dir
->direntlen
>= 0) {
562 * blocksize-totalbytes because last directory
563 * length i.e.,*dir->direntlen is free availble
564 * space in the block that means
565 * it is a last entry of directory entry
567 if (strlen(dirname
) == dir
->namelen
) {
568 if (strncmp(dirname
, ptr
+
569 sizeof(struct ext2_dirent
),
570 dir
->namelen
) == 0) {
571 previous_dir
->direntlen
+=
573 inodeno
= dir
->inode
;
580 if (fs
->blksz
- totalbytes
== dir
->direntlen
)
583 /* traversing the each directory entry */
584 templength
= dir
->direntlen
;
585 totalbytes
= totalbytes
+ templength
;
587 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
607 static int find_dir_depth(char *dirname
)
609 char *token
= strtok(dirname
, "/");
611 while (token
!= NULL
) {
612 token
= strtok(NULL
, "/");
615 return count
+ 1 + 1;
617 * for example for string /home/temp
618 * depth=home(1)+temp(1)+1 extra for NULL;
623 static int parse_path(char **arr
, char *dirname
)
625 char *token
= strtok(dirname
, "/");
629 arr
[i
] = zalloc(strlen("/") + 1);
635 /* add each path entry after root */
636 while (token
!= NULL
) {
637 arr
[i
] = zalloc(strlen(token
) + 1);
640 memcpy(arr
[i
++], token
, strlen(token
));
641 token
= strtok(NULL
, "/");
648 int ext4fs_iget(int inode_no
, struct ext2_inode
*inode
)
650 if (ext4fs_read_inode(ext4fs_root
, inode_no
, inode
) == 0)
657 * Function: ext4fs_get_parent_inode_num
658 * Return Value: inode Number of the parent directory of file/Directory to be
660 * dirname : Input parmater, input path name of the file/directory to be created
661 * dname : Output parameter, to be filled with the name of the directory
662 * extracted from dirname
664 int ext4fs_get_parent_inode_num(const char *dirname
, char *dname
, int flags
)
668 int matched_inode_no
;
669 int result_inode_no
= -1;
671 char *depth_dirname
= NULL
;
672 char *parse_dirname
= NULL
;
673 struct ext2_inode
*parent_inode
= NULL
;
674 struct ext2_inode
*first_inode
= NULL
;
675 struct ext2_inode temp_inode
;
677 if (*dirname
!= '/') {
678 printf("Please supply Absolute path\n");
682 /* TODO: input validation make equivalent to linux */
683 depth_dirname
= zalloc(strlen(dirname
) + 1);
687 memcpy(depth_dirname
, dirname
, strlen(dirname
));
688 depth
= find_dir_depth(depth_dirname
);
689 parse_dirname
= zalloc(strlen(dirname
) + 1);
692 memcpy(parse_dirname
, dirname
, strlen(dirname
));
694 /* allocate memory for each directory level */
695 ptr
= zalloc((depth
) * sizeof(char *));
698 if (parse_path(ptr
, parse_dirname
))
700 parent_inode
= zalloc(sizeof(struct ext2_inode
));
703 first_inode
= zalloc(sizeof(struct ext2_inode
));
706 memcpy(parent_inode
, ext4fs_root
->inode
, sizeof(struct ext2_inode
));
707 memcpy(first_inode
, parent_inode
, sizeof(struct ext2_inode
));
709 result_inode_no
= EXT2_ROOT_INO
;
710 for (i
= 1; i
< depth
; i
++) {
711 matched_inode_no
= search_dir(parent_inode
, ptr
[i
]);
712 if (matched_inode_no
== -1) {
713 if (ptr
[i
+ 1] == NULL
&& i
== 1) {
714 result_inode_no
= EXT2_ROOT_INO
;
717 if (ptr
[i
+ 1] == NULL
)
719 printf("Invalid path\n");
720 result_inode_no
= -1;
724 if (ptr
[i
+ 1] != NULL
) {
725 memset(parent_inode
, '\0',
726 sizeof(struct ext2_inode
));
727 if (ext4fs_iget(matched_inode_no
,
729 result_inode_no
= -1;
732 result_inode_no
= matched_inode_no
;
741 matched_inode_no
= search_dir(first_inode
, ptr
[i
]);
743 matched_inode_no
= search_dir(parent_inode
, ptr
[i
]);
745 if (matched_inode_no
!= -1) {
746 ext4fs_iget(matched_inode_no
, &temp_inode
);
747 if (temp_inode
.mode
& S_IFDIR
) {
748 printf("It is a Directory\n");
749 result_inode_no
= -1;
754 if (strlen(ptr
[i
]) > 256) {
755 result_inode_no
= -1;
758 memcpy(dname
, ptr
[i
], strlen(ptr
[i
]));
767 return result_inode_no
;
770 static int check_filename(char *filename
, unsigned int blknr
)
772 unsigned int first_block_no_of_root
;
777 char *root_first_block_buffer
= NULL
;
778 char *root_first_block_addr
= NULL
;
779 struct ext2_dirent
*dir
= NULL
;
780 struct ext2_dirent
*previous_dir
= NULL
;
782 struct ext_filesystem
*fs
= get_fs();
784 /* get the first block of root */
785 first_block_no_of_root
= blknr
;
786 root_first_block_buffer
= zalloc(fs
->blksz
);
787 if (!root_first_block_buffer
)
789 root_first_block_addr
= root_first_block_buffer
;
790 status
= ext4fs_devread(first_block_no_of_root
*
792 fs
->blksz
, root_first_block_buffer
);
796 if (ext4fs_log_journal(root_first_block_buffer
, first_block_no_of_root
))
798 dir
= (struct ext2_dirent
*)root_first_block_buffer
;
801 while (dir
->direntlen
>= 0) {
803 * blocksize-totalbytes because last
804 * directory length i.e., *dir->direntlen
805 * is free availble space in the block that
806 * means it is a last entry of directory entry
808 if (strlen(filename
) == dir
->namelen
) {
809 if (strncmp(filename
, ptr
+ sizeof(struct ext2_dirent
),
810 dir
->namelen
) == 0) {
811 printf("file found deleting\n");
812 previous_dir
->direntlen
+= dir
->direntlen
;
813 inodeno
= dir
->inode
;
820 if (fs
->blksz
- totalbytes
== dir
->direntlen
)
823 /* traversing the each directory entry */
824 templength
= dir
->direntlen
;
825 totalbytes
= totalbytes
+ templength
;
827 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
833 if (ext4fs_put_metadata(root_first_block_addr
,
834 first_block_no_of_root
))
839 free(root_first_block_buffer
);
844 int ext4fs_filename_check(char *filename
)
846 short direct_blk_idx
= 0;
850 /* read the block no allocated to a file */
851 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
853 blknr
= read_allocated_block(g_parent_inode
, direct_blk_idx
);
856 inodeno
= check_filename(filename
, blknr
);
864 long int ext4fs_get_new_blk_no(void)
870 static int prev_bg_bitmap_index
= -1;
871 unsigned int blk_per_grp
= ext4fs_root
->sblock
.blocks_per_group
;
872 struct ext_filesystem
*fs
= get_fs();
873 char *journal_buffer
= zalloc(fs
->blksz
);
874 char *zero_buffer
= zalloc(fs
->blksz
);
875 if (!journal_buffer
|| !zero_buffer
)
877 struct ext2_block_group
*bgd
= (struct ext2_block_group
*)fs
->gdtable
;
879 if (fs
->first_pass_bbmap
== 0) {
880 for (i
= 0; i
< fs
->no_blkgrp
; i
++) {
881 if (bgd
[i
].free_blocks
) {
882 if (bgd
[i
].bg_flags
& EXT4_BG_BLOCK_UNINIT
) {
883 put_ext4(((uint64_t) (bgd
[i
].block_id
*
885 zero_buffer
, fs
->blksz
);
888 bg_flags
& ~EXT4_BG_BLOCK_UNINIT
;
889 memcpy(fs
->blk_bmaps
[i
], zero_buffer
,
893 _get_new_blk_no(fs
->blk_bmaps
[i
]);
894 if (fs
->curr_blkno
== -1)
895 /* if block bitmap is completely fill */
897 fs
->curr_blkno
= fs
->curr_blkno
+
899 fs
->first_pass_bbmap
++;
900 bgd
[i
].free_blocks
--;
901 fs
->sb
->free_blocks
--;
902 status
= ext4fs_devread(bgd
[i
].block_id
*
908 if (ext4fs_log_journal(journal_buffer
,
913 debug("no space left on block group %d\n", i
);
921 /* get the blockbitmap index respective to blockno */
922 if (fs
->blksz
!= 1024) {
923 bg_idx
= fs
->curr_blkno
/ blk_per_grp
;
925 bg_idx
= fs
->curr_blkno
/ blk_per_grp
;
926 remainder
= fs
->curr_blkno
% blk_per_grp
;
932 * To skip completely filled block group bitmaps
933 * Optimize the block allocation
935 if (bg_idx
>= fs
->no_blkgrp
)
938 if (bgd
[bg_idx
].free_blocks
== 0) {
939 debug("block group %u is full. Skipping\n", bg_idx
);
940 fs
->curr_blkno
= fs
->curr_blkno
+ blk_per_grp
;
945 if (bgd
[bg_idx
].bg_flags
& EXT4_BG_BLOCK_UNINIT
) {
946 memset(zero_buffer
, '\0', fs
->blksz
);
947 put_ext4(((uint64_t) (bgd
[bg_idx
].block_id
*
948 fs
->blksz
)), zero_buffer
, fs
->blksz
);
949 memcpy(fs
->blk_bmaps
[bg_idx
], zero_buffer
, fs
->blksz
);
950 bgd
[bg_idx
].bg_flags
= bgd
[bg_idx
].bg_flags
&
951 ~EXT4_BG_BLOCK_UNINIT
;
954 if (ext4fs_set_block_bmap(fs
->curr_blkno
, fs
->blk_bmaps
[bg_idx
],
956 debug("going for restart for the block no %ld %u\n",
957 fs
->curr_blkno
, bg_idx
);
962 if (prev_bg_bitmap_index
!= bg_idx
) {
963 memset(journal_buffer
, '\0', fs
->blksz
);
964 status
= ext4fs_devread(bgd
[bg_idx
].block_id
966 0, fs
->blksz
, journal_buffer
);
969 if (ext4fs_log_journal(journal_buffer
,
970 bgd
[bg_idx
].block_id
))
973 prev_bg_bitmap_index
= bg_idx
;
975 bgd
[bg_idx
].free_blocks
--;
976 fs
->sb
->free_blocks
--;
980 free(journal_buffer
);
983 return fs
->curr_blkno
;
985 free(journal_buffer
);
991 int ext4fs_get_new_inode_no(void)
995 unsigned int ibmap_idx
;
996 static int prev_inode_bitmap_index
= -1;
997 unsigned int inodes_per_grp
= ext4fs_root
->sblock
.inodes_per_group
;
998 struct ext_filesystem
*fs
= get_fs();
999 char *journal_buffer
= zalloc(fs
->blksz
);
1000 char *zero_buffer
= zalloc(fs
->blksz
);
1001 if (!journal_buffer
|| !zero_buffer
)
1003 struct ext2_block_group
*bgd
= (struct ext2_block_group
*)fs
->gdtable
;
1005 if (fs
->first_pass_ibmap
== 0) {
1006 for (i
= 0; i
< fs
->no_blkgrp
; i
++) {
1007 if (bgd
[i
].free_inodes
) {
1008 if (bgd
[i
].bg_itable_unused
!=
1010 bgd
[i
].bg_itable_unused
=
1012 if (bgd
[i
].bg_flags
& EXT4_BG_INODE_UNINIT
) {
1013 put_ext4(((uint64_t)
1016 zero_buffer
, fs
->blksz
);
1017 bgd
[i
].bg_flags
= bgd
[i
].bg_flags
&
1018 ~EXT4_BG_INODE_UNINIT
;
1019 memcpy(fs
->inode_bmaps
[i
],
1020 zero_buffer
, fs
->blksz
);
1023 _get_new_inode_no(fs
->inode_bmaps
[i
]);
1024 if (fs
->curr_inode_no
== -1)
1025 /* if block bitmap is completely fill */
1027 fs
->curr_inode_no
= fs
->curr_inode_no
+
1028 (i
* inodes_per_grp
);
1029 fs
->first_pass_ibmap
++;
1030 bgd
[i
].free_inodes
--;
1031 bgd
[i
].bg_itable_unused
--;
1032 fs
->sb
->free_inodes
--;
1033 status
= ext4fs_devread(bgd
[i
].inode_id
*
1039 if (ext4fs_log_journal(journal_buffer
,
1044 debug("no inode left on block group %d\n", i
);
1049 fs
->curr_inode_no
++;
1050 /* get the blockbitmap index respective to blockno */
1051 ibmap_idx
= fs
->curr_inode_no
/ inodes_per_grp
;
1052 if (bgd
[ibmap_idx
].bg_flags
& EXT4_BG_INODE_UNINIT
) {
1053 memset(zero_buffer
, '\0', fs
->blksz
);
1054 put_ext4(((uint64_t) (bgd
[ibmap_idx
].inode_id
*
1055 fs
->blksz
)), zero_buffer
,
1057 bgd
[ibmap_idx
].bg_flags
=
1058 bgd
[ibmap_idx
].bg_flags
& ~EXT4_BG_INODE_UNINIT
;
1059 memcpy(fs
->inode_bmaps
[ibmap_idx
], zero_buffer
,
1063 if (ext4fs_set_inode_bmap(fs
->curr_inode_no
,
1064 fs
->inode_bmaps
[ibmap_idx
],
1066 debug("going for restart for the block no %d %u\n",
1067 fs
->curr_inode_no
, ibmap_idx
);
1071 /* journal backup */
1072 if (prev_inode_bitmap_index
!= ibmap_idx
) {
1073 memset(journal_buffer
, '\0', fs
->blksz
);
1074 status
= ext4fs_devread(bgd
[ibmap_idx
].inode_id
1076 0, fs
->blksz
, journal_buffer
);
1079 if (ext4fs_log_journal(journal_buffer
,
1080 bgd
[ibmap_idx
].inode_id
))
1082 prev_inode_bitmap_index
= ibmap_idx
;
1084 if (bgd
[ibmap_idx
].bg_itable_unused
!=
1085 bgd
[ibmap_idx
].free_inodes
)
1086 bgd
[ibmap_idx
].bg_itable_unused
=
1087 bgd
[ibmap_idx
].free_inodes
;
1088 bgd
[ibmap_idx
].free_inodes
--;
1089 bgd
[ibmap_idx
].bg_itable_unused
--;
1090 fs
->sb
->free_inodes
--;
1095 free(journal_buffer
);
1098 return fs
->curr_inode_no
;
1100 free(journal_buffer
);
1108 static void alloc_single_indirect_block(struct ext2_inode
*file_inode
,
1109 unsigned int *total_remaining_blocks
,
1110 unsigned int *no_blks_reqd
)
1114 long int actual_block_no
;
1115 long int si_blockno
;
1116 /* si :single indirect */
1117 unsigned int *si_buffer
= NULL
;
1118 unsigned int *si_start_addr
= NULL
;
1119 struct ext_filesystem
*fs
= get_fs();
1121 if (*total_remaining_blocks
!= 0) {
1122 si_buffer
= zalloc(fs
->blksz
);
1124 printf("No Memory\n");
1127 si_start_addr
= si_buffer
;
1128 si_blockno
= ext4fs_get_new_blk_no();
1129 if (si_blockno
== -1) {
1130 printf("no block left to assign\n");
1134 debug("SIPB %ld: %u\n", si_blockno
, *total_remaining_blocks
);
1136 status
= ext4fs_devread(si_blockno
* fs
->sect_perblk
,
1137 0, fs
->blksz
, (char *)si_buffer
);
1138 memset(si_buffer
, '\0', fs
->blksz
);
1142 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1143 actual_block_no
= ext4fs_get_new_blk_no();
1144 if (actual_block_no
== -1) {
1145 printf("no block left to assign\n");
1148 *si_buffer
= actual_block_no
;
1149 debug("SIAB %u: %u\n", *si_buffer
,
1150 *total_remaining_blocks
);
1153 (*total_remaining_blocks
)--;
1154 if (*total_remaining_blocks
== 0)
1158 /* write the block to disk */
1159 put_ext4(((uint64_t) (si_blockno
* fs
->blksz
)),
1160 si_start_addr
, fs
->blksz
);
1161 file_inode
->b
.blocks
.indir_block
= si_blockno
;
1164 free(si_start_addr
);
1167 static void alloc_double_indirect_block(struct ext2_inode
*file_inode
,
1168 unsigned int *total_remaining_blocks
,
1169 unsigned int *no_blks_reqd
)
1174 long int actual_block_no
;
1175 /* di:double indirect */
1176 long int di_blockno_parent
;
1177 long int di_blockno_child
;
1178 unsigned int *di_parent_buffer
= NULL
;
1179 unsigned int *di_child_buff
= NULL
;
1180 unsigned int *di_block_start_addr
= NULL
;
1181 unsigned int *di_child_buff_start
= NULL
;
1182 struct ext_filesystem
*fs
= get_fs();
1184 if (*total_remaining_blocks
!= 0) {
1185 /* double indirect parent block connecting to inode */
1186 di_blockno_parent
= ext4fs_get_new_blk_no();
1187 if (di_blockno_parent
== -1) {
1188 printf("no block left to assign\n");
1191 di_parent_buffer
= zalloc(fs
->blksz
);
1192 if (!di_parent_buffer
)
1195 di_block_start_addr
= di_parent_buffer
;
1197 debug("DIPB %ld: %u\n", di_blockno_parent
,
1198 *total_remaining_blocks
);
1200 status
= ext4fs_devread(di_blockno_parent
*
1202 fs
->blksz
, (char *)di_parent_buffer
);
1203 memset(di_parent_buffer
, '\0', fs
->blksz
);
1206 * start:for each double indirect parent
1207 * block create one more block
1209 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1210 di_blockno_child
= ext4fs_get_new_blk_no();
1211 if (di_blockno_child
== -1) {
1212 printf("no block left to assign\n");
1215 di_child_buff
= zalloc(fs
->blksz
);
1219 di_child_buff_start
= di_child_buff
;
1220 *di_parent_buffer
= di_blockno_child
;
1223 debug("DICB %ld: %u\n", di_blockno_child
,
1224 *total_remaining_blocks
);
1226 status
= ext4fs_devread(di_blockno_child
*
1229 (char *)di_child_buff
);
1230 memset(di_child_buff
, '\0', fs
->blksz
);
1231 /* filling of actual datablocks for each child */
1232 for (j
= 0; j
< (fs
->blksz
/ sizeof(int)); j
++) {
1233 actual_block_no
= ext4fs_get_new_blk_no();
1234 if (actual_block_no
== -1) {
1235 printf("no block left to assign\n");
1238 *di_child_buff
= actual_block_no
;
1239 debug("DIAB %ld: %u\n", actual_block_no
,
1240 *total_remaining_blocks
);
1243 (*total_remaining_blocks
)--;
1244 if (*total_remaining_blocks
== 0)
1247 /* write the block table */
1248 put_ext4(((uint64_t) (di_blockno_child
* fs
->blksz
)),
1249 di_child_buff_start
, fs
->blksz
);
1250 free(di_child_buff_start
);
1251 di_child_buff_start
= NULL
;
1253 if (*total_remaining_blocks
== 0)
1256 put_ext4(((uint64_t) (di_blockno_parent
* fs
->blksz
)),
1257 di_block_start_addr
, fs
->blksz
);
1258 file_inode
->b
.blocks
.double_indir_block
= di_blockno_parent
;
1261 free(di_block_start_addr
);
1264 static void alloc_triple_indirect_block(struct ext2_inode
*file_inode
,
1265 unsigned int *total_remaining_blocks
,
1266 unsigned int *no_blks_reqd
)
1271 long int actual_block_no
;
1272 /* ti: Triple Indirect */
1273 long int ti_gp_blockno
;
1274 long int ti_parent_blockno
;
1275 long int ti_child_blockno
;
1276 unsigned int *ti_gp_buff
= NULL
;
1277 unsigned int *ti_parent_buff
= NULL
;
1278 unsigned int *ti_child_buff
= NULL
;
1279 unsigned int *ti_gp_buff_start_addr
= NULL
;
1280 unsigned int *ti_pbuff_start_addr
= NULL
;
1281 unsigned int *ti_cbuff_start_addr
= NULL
;
1282 struct ext_filesystem
*fs
= get_fs();
1283 if (*total_remaining_blocks
!= 0) {
1284 /* triple indirect grand parent block connecting to inode */
1285 ti_gp_blockno
= ext4fs_get_new_blk_no();
1286 if (ti_gp_blockno
== -1) {
1287 printf("no block left to assign\n");
1290 ti_gp_buff
= zalloc(fs
->blksz
);
1294 ti_gp_buff_start_addr
= ti_gp_buff
;
1296 debug("TIGPB %ld: %u\n", ti_gp_blockno
,
1297 *total_remaining_blocks
);
1299 /* for each 4 byte grand parent entry create one more block */
1300 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1301 ti_parent_blockno
= ext4fs_get_new_blk_no();
1302 if (ti_parent_blockno
== -1) {
1303 printf("no block left to assign\n");
1306 ti_parent_buff
= zalloc(fs
->blksz
);
1307 if (!ti_parent_buff
)
1310 ti_pbuff_start_addr
= ti_parent_buff
;
1311 *ti_gp_buff
= ti_parent_blockno
;
1314 debug("TIPB %ld: %u\n", ti_parent_blockno
,
1315 *total_remaining_blocks
);
1317 /* for each 4 byte entry parent create one more block */
1318 for (j
= 0; j
< (fs
->blksz
/ sizeof(int)); j
++) {
1319 ti_child_blockno
= ext4fs_get_new_blk_no();
1320 if (ti_child_blockno
== -1) {
1321 printf("no block left assign\n");
1324 ti_child_buff
= zalloc(fs
->blksz
);
1328 ti_cbuff_start_addr
= ti_child_buff
;
1329 *ti_parent_buff
= ti_child_blockno
;
1332 debug("TICB %ld: %u\n", ti_parent_blockno
,
1333 *total_remaining_blocks
);
1335 /* fill actual datablocks for each child */
1336 for (k
= 0; k
< (fs
->blksz
/ sizeof(int));
1339 ext4fs_get_new_blk_no();
1340 if (actual_block_no
== -1) {
1341 printf("no block left\n");
1344 *ti_child_buff
= actual_block_no
;
1345 debug("TIAB %ld: %u\n", actual_block_no
,
1346 *total_remaining_blocks
);
1349 (*total_remaining_blocks
)--;
1350 if (*total_remaining_blocks
== 0)
1353 /* write the child block */
1354 put_ext4(((uint64_t) (ti_child_blockno
*
1356 ti_cbuff_start_addr
, fs
->blksz
);
1357 free(ti_cbuff_start_addr
);
1359 if (*total_remaining_blocks
== 0)
1362 /* write the parent block */
1363 put_ext4(((uint64_t) (ti_parent_blockno
* fs
->blksz
)),
1364 ti_pbuff_start_addr
, fs
->blksz
);
1365 free(ti_pbuff_start_addr
);
1367 if (*total_remaining_blocks
== 0)
1370 /* write the grand parent block */
1371 put_ext4(((uint64_t) (ti_gp_blockno
* fs
->blksz
)),
1372 ti_gp_buff_start_addr
, fs
->blksz
);
1373 file_inode
->b
.blocks
.triple_indir_block
= ti_gp_blockno
;
1376 free(ti_gp_buff_start_addr
);
1379 void ext4fs_allocate_blocks(struct ext2_inode
*file_inode
,
1380 unsigned int total_remaining_blocks
,
1381 unsigned int *total_no_of_block
)
1384 long int direct_blockno
;
1385 unsigned int no_blks_reqd
= 0;
1387 /* allocation of direct blocks */
1388 for (i
= 0; i
< INDIRECT_BLOCKS
; i
++) {
1389 direct_blockno
= ext4fs_get_new_blk_no();
1390 if (direct_blockno
== -1) {
1391 printf("no block left to assign\n");
1394 file_inode
->b
.blocks
.dir_blocks
[i
] = direct_blockno
;
1395 debug("DB %ld: %u\n", direct_blockno
, total_remaining_blocks
);
1397 total_remaining_blocks
--;
1398 if (total_remaining_blocks
== 0)
1402 alloc_single_indirect_block(file_inode
, &total_remaining_blocks
,
1404 alloc_double_indirect_block(file_inode
, &total_remaining_blocks
,
1406 alloc_triple_indirect_block(file_inode
, &total_remaining_blocks
,
1408 *total_no_of_block
+= no_blks_reqd
;
1413 static struct ext4_extent_header
*ext4fs_get_extent_block
1414 (struct ext2_data
*data
, char *buf
,
1415 struct ext4_extent_header
*ext_block
,
1416 uint32_t fileblock
, int log2_blksz
)
1418 struct ext4_extent_idx
*index
;
1419 unsigned long long block
;
1420 struct ext_filesystem
*fs
= get_fs();
1424 index
= (struct ext4_extent_idx
*)(ext_block
+ 1);
1426 if (le32_to_cpu(ext_block
->eh_magic
) != EXT4_EXT_MAGIC
)
1429 if (ext_block
->eh_depth
== 0)
1434 if (i
>= le32_to_cpu(ext_block
->eh_entries
))
1436 } while (fileblock
> le32_to_cpu(index
[i
].ei_block
));
1441 block
= le32_to_cpu(index
[i
].ei_leaf_hi
);
1442 block
= (block
<< 32) + le32_to_cpu(index
[i
].ei_leaf_lo
);
1444 if (ext4fs_devread(block
<< log2_blksz
, 0, fs
->blksz
, buf
))
1445 ext_block
= (struct ext4_extent_header
*)buf
;
1451 static int ext4fs_blockgroup
1452 (struct ext2_data
*data
, int group
, struct ext2_block_group
*blkgrp
)
1455 unsigned int blkoff
, desc_per_blk
;
1457 desc_per_blk
= EXT2_BLOCK_SIZE(data
) / sizeof(struct ext2_block_group
);
1459 blkno
= __le32_to_cpu(data
->sblock
.first_data_block
) + 1 +
1460 group
/ desc_per_blk
;
1461 blkoff
= (group
% desc_per_blk
) * sizeof(struct ext2_block_group
);
1463 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1464 group
, blkno
, blkoff
);
1466 return ext4fs_devread(blkno
<< LOG2_EXT2_BLOCK_SIZE(data
),
1467 blkoff
, sizeof(struct ext2_block_group
),
1471 int ext4fs_read_inode(struct ext2_data
*data
, int ino
, struct ext2_inode
*inode
)
1473 struct ext2_block_group blkgrp
;
1474 struct ext2_sblock
*sblock
= &data
->sblock
;
1475 struct ext_filesystem
*fs
= get_fs();
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(blkno
<< LOG2_EXT2_BLOCK_SIZE(data
), blkoff
,
1493 sizeof(struct ext2_inode
), (char *)inode
);
1500 long int read_allocated_block(struct ext2_inode
*inode
, int fileblock
)
1507 long int perblock_parent
;
1508 long int perblock_child
;
1509 unsigned long long start
;
1510 /* get the blocksize of the filesystem */
1511 blksz
= EXT2_BLOCK_SIZE(ext4fs_root
);
1512 log2_blksz
= LOG2_EXT2_BLOCK_SIZE(ext4fs_root
);
1513 if (le32_to_cpu(inode
->flags
) & EXT4_EXTENTS_FL
) {
1514 char *buf
= zalloc(blksz
);
1517 struct ext4_extent_header
*ext_block
;
1518 struct ext4_extent
*extent
;
1520 ext_block
= ext4fs_get_extent_block(ext4fs_root
, buf
,
1521 (struct ext4_extent_header
1524 fileblock
, log2_blksz
);
1526 printf("invalid extent block\n");
1531 extent
= (struct ext4_extent
*)(ext_block
+ 1);
1535 if (i
>= le32_to_cpu(ext_block
->eh_entries
))
1537 } while (fileblock
>= le32_to_cpu(extent
[i
].ee_block
));
1539 fileblock
-= le32_to_cpu(extent
[i
].ee_block
);
1540 if (fileblock
>= le32_to_cpu(extent
[i
].ee_len
)) {
1545 start
= le32_to_cpu(extent
[i
].ee_start_hi
);
1546 start
= (start
<< 32) +
1547 le32_to_cpu(extent
[i
].ee_start_lo
);
1549 return fileblock
+ start
;
1552 printf("Extent Error\n");
1557 /* Direct blocks. */
1558 if (fileblock
< INDIRECT_BLOCKS
)
1559 blknr
= __le32_to_cpu(inode
->b
.blocks
.dir_blocks
[fileblock
]);
1562 else if (fileblock
< (INDIRECT_BLOCKS
+ (blksz
/ 4))) {
1563 if (ext4fs_indir1_block
== NULL
) {
1564 ext4fs_indir1_block
= zalloc(blksz
);
1565 if (ext4fs_indir1_block
== NULL
) {
1566 printf("** SI ext2fs read block (indir 1)"
1567 "malloc failed. **\n");
1570 ext4fs_indir1_size
= blksz
;
1571 ext4fs_indir1_blkno
= -1;
1573 if (blksz
!= ext4fs_indir1_size
) {
1574 free(ext4fs_indir1_block
);
1575 ext4fs_indir1_block
= NULL
;
1576 ext4fs_indir1_size
= 0;
1577 ext4fs_indir1_blkno
= -1;
1578 ext4fs_indir1_block
= zalloc(blksz
);
1579 if (ext4fs_indir1_block
== NULL
) {
1580 printf("** SI ext2fs read block (indir 1):"
1581 "malloc failed. **\n");
1584 ext4fs_indir1_size
= blksz
;
1586 if ((__le32_to_cpu(inode
->b
.blocks
.indir_block
) <<
1587 log2_blksz
) != ext4fs_indir1_blkno
) {
1589 ext4fs_devread(__le32_to_cpu
1591 indir_block
) << log2_blksz
, 0,
1592 blksz
, (char *)ext4fs_indir1_block
);
1594 printf("** SI ext2fs read block (indir 1)"
1598 ext4fs_indir1_blkno
=
1599 __le32_to_cpu(inode
->b
.blocks
.
1600 indir_block
) << log2_blksz
;
1602 blknr
= __le32_to_cpu(ext4fs_indir1_block
1603 [fileblock
- INDIRECT_BLOCKS
]);
1605 /* Double indirect. */
1606 else if (fileblock
< (INDIRECT_BLOCKS
+ (blksz
/ 4 *
1607 (blksz
/ 4 + 1)))) {
1609 long int perblock
= blksz
/ 4;
1610 long int rblock
= fileblock
- (INDIRECT_BLOCKS
+ blksz
/ 4);
1612 if (ext4fs_indir1_block
== NULL
) {
1613 ext4fs_indir1_block
= zalloc(blksz
);
1614 if (ext4fs_indir1_block
== NULL
) {
1615 printf("** DI ext2fs read block (indir 2 1)"
1616 "malloc failed. **\n");
1619 ext4fs_indir1_size
= blksz
;
1620 ext4fs_indir1_blkno
= -1;
1622 if (blksz
!= ext4fs_indir1_size
) {
1623 free(ext4fs_indir1_block
);
1624 ext4fs_indir1_block
= NULL
;
1625 ext4fs_indir1_size
= 0;
1626 ext4fs_indir1_blkno
= -1;
1627 ext4fs_indir1_block
= zalloc(blksz
);
1628 if (ext4fs_indir1_block
== NULL
) {
1629 printf("** DI ext2fs read block (indir 2 1)"
1630 "malloc failed. **\n");
1633 ext4fs_indir1_size
= blksz
;
1635 if ((__le32_to_cpu(inode
->b
.blocks
.double_indir_block
) <<
1636 log2_blksz
) != ext4fs_indir1_blkno
) {
1638 ext4fs_devread(__le32_to_cpu
1640 double_indir_block
) << log2_blksz
,
1642 (char *)ext4fs_indir1_block
);
1644 printf("** DI ext2fs read block (indir 2 1)"
1648 ext4fs_indir1_blkno
=
1649 __le32_to_cpu(inode
->b
.blocks
.double_indir_block
) <<
1653 if (ext4fs_indir2_block
== NULL
) {
1654 ext4fs_indir2_block
= zalloc(blksz
);
1655 if (ext4fs_indir2_block
== NULL
) {
1656 printf("** DI ext2fs read block (indir 2 2)"
1657 "malloc failed. **\n");
1660 ext4fs_indir2_size
= blksz
;
1661 ext4fs_indir2_blkno
= -1;
1663 if (blksz
!= ext4fs_indir2_size
) {
1664 free(ext4fs_indir2_block
);
1665 ext4fs_indir2_block
= NULL
;
1666 ext4fs_indir2_size
= 0;
1667 ext4fs_indir2_blkno
= -1;
1668 ext4fs_indir2_block
= zalloc(blksz
);
1669 if (ext4fs_indir2_block
== NULL
) {
1670 printf("** DI ext2fs read block (indir 2 2)"
1671 "malloc failed. **\n");
1674 ext4fs_indir2_size
= blksz
;
1676 if ((__le32_to_cpu(ext4fs_indir1_block
[rblock
/ perblock
]) <<
1677 log2_blksz
) != ext4fs_indir2_blkno
) {
1678 status
= ext4fs_devread(__le32_to_cpu
1679 (ext4fs_indir1_block
1681 perblock
]) << log2_blksz
, 0,
1683 (char *)ext4fs_indir2_block
);
1685 printf("** DI ext2fs read block (indir 2 2)"
1689 ext4fs_indir2_blkno
=
1690 __le32_to_cpu(ext4fs_indir1_block
[rblock
1695 blknr
= __le32_to_cpu(ext4fs_indir2_block
[rblock
% perblock
]);
1697 /* Tripple indirect. */
1699 rblock
= fileblock
- (INDIRECT_BLOCKS
+ blksz
/ 4 +
1700 (blksz
/ 4 * blksz
/ 4));
1701 perblock_child
= blksz
/ 4;
1702 perblock_parent
= ((blksz
/ 4) * (blksz
/ 4));
1704 if (ext4fs_indir1_block
== NULL
) {
1705 ext4fs_indir1_block
= zalloc(blksz
);
1706 if (ext4fs_indir1_block
== NULL
) {
1707 printf("** TI ext2fs read block (indir 2 1)"
1708 "malloc failed. **\n");
1711 ext4fs_indir1_size
= blksz
;
1712 ext4fs_indir1_blkno
= -1;
1714 if (blksz
!= ext4fs_indir1_size
) {
1715 free(ext4fs_indir1_block
);
1716 ext4fs_indir1_block
= NULL
;
1717 ext4fs_indir1_size
= 0;
1718 ext4fs_indir1_blkno
= -1;
1719 ext4fs_indir1_block
= zalloc(blksz
);
1720 if (ext4fs_indir1_block
== NULL
) {
1721 printf("** TI ext2fs read block (indir 2 1)"
1722 "malloc failed. **\n");
1725 ext4fs_indir1_size
= blksz
;
1727 if ((__le32_to_cpu(inode
->b
.blocks
.triple_indir_block
) <<
1728 log2_blksz
) != ext4fs_indir1_blkno
) {
1729 status
= ext4fs_devread
1730 (__le32_to_cpu(inode
->b
.blocks
.triple_indir_block
)
1731 << log2_blksz
, 0, blksz
,
1732 (char *)ext4fs_indir1_block
);
1734 printf("** TI ext2fs read block (indir 2 1)"
1738 ext4fs_indir1_blkno
=
1739 __le32_to_cpu(inode
->b
.blocks
.triple_indir_block
) <<
1743 if (ext4fs_indir2_block
== NULL
) {
1744 ext4fs_indir2_block
= zalloc(blksz
);
1745 if (ext4fs_indir2_block
== NULL
) {
1746 printf("** TI ext2fs read block (indir 2 2)"
1747 "malloc failed. **\n");
1750 ext4fs_indir2_size
= blksz
;
1751 ext4fs_indir2_blkno
= -1;
1753 if (blksz
!= ext4fs_indir2_size
) {
1754 free(ext4fs_indir2_block
);
1755 ext4fs_indir2_block
= NULL
;
1756 ext4fs_indir2_size
= 0;
1757 ext4fs_indir2_blkno
= -1;
1758 ext4fs_indir2_block
= zalloc(blksz
);
1759 if (ext4fs_indir2_block
== NULL
) {
1760 printf("** TI ext2fs read block (indir 2 2)"
1761 "malloc failed. **\n");
1764 ext4fs_indir2_size
= blksz
;
1766 if ((__le32_to_cpu(ext4fs_indir1_block
[rblock
/
1767 perblock_parent
]) <<
1769 != ext4fs_indir2_blkno
) {
1770 status
= ext4fs_devread(__le32_to_cpu
1771 (ext4fs_indir1_block
1773 perblock_parent
]) <<
1774 log2_blksz
, 0, blksz
,
1775 (char *)ext4fs_indir2_block
);
1777 printf("** TI ext2fs read block (indir 2 2)"
1781 ext4fs_indir2_blkno
=
1782 __le32_to_cpu(ext4fs_indir1_block
[rblock
/
1787 if (ext4fs_indir3_block
== NULL
) {
1788 ext4fs_indir3_block
= zalloc(blksz
);
1789 if (ext4fs_indir3_block
== NULL
) {
1790 printf("** TI ext2fs read block (indir 2 2)"
1791 "malloc failed. **\n");
1794 ext4fs_indir3_size
= blksz
;
1795 ext4fs_indir3_blkno
= -1;
1797 if (blksz
!= ext4fs_indir3_size
) {
1798 free(ext4fs_indir3_block
);
1799 ext4fs_indir3_block
= NULL
;
1800 ext4fs_indir3_size
= 0;
1801 ext4fs_indir3_blkno
= -1;
1802 ext4fs_indir3_block
= zalloc(blksz
);
1803 if (ext4fs_indir3_block
== NULL
) {
1804 printf("** TI ext2fs read block (indir 2 2)"
1805 "malloc failed. **\n");
1808 ext4fs_indir3_size
= blksz
;
1810 if ((__le32_to_cpu(ext4fs_indir2_block
[rblock
1813 log2_blksz
) != ext4fs_indir3_blkno
) {
1815 ext4fs_devread(__le32_to_cpu
1816 (ext4fs_indir2_block
1817 [(rblock
/ perblock_child
)
1818 % (blksz
/ 4)]) << log2_blksz
, 0,
1819 blksz
, (char *)ext4fs_indir3_block
);
1821 printf("** TI ext2fs read block (indir 2 2)"
1825 ext4fs_indir3_blkno
=
1826 __le32_to_cpu(ext4fs_indir2_block
[(rblock
/
1833 blknr
= __le32_to_cpu(ext4fs_indir3_block
1834 [rblock
% perblock_child
]);
1836 debug("ext4fs_read_block %ld\n", blknr
);
1841 void ext4fs_close(void)
1843 if ((ext4fs_file
!= NULL
) && (ext4fs_root
!= NULL
)) {
1844 ext4fs_free_node(ext4fs_file
, &ext4fs_root
->diropen
);
1847 if (ext4fs_root
!= NULL
) {
1851 if (ext4fs_indir1_block
!= NULL
) {
1852 free(ext4fs_indir1_block
);
1853 ext4fs_indir1_block
= NULL
;
1854 ext4fs_indir1_size
= 0;
1855 ext4fs_indir1_blkno
= -1;
1857 if (ext4fs_indir2_block
!= NULL
) {
1858 free(ext4fs_indir2_block
);
1859 ext4fs_indir2_block
= NULL
;
1860 ext4fs_indir2_size
= 0;
1861 ext4fs_indir2_blkno
= -1;
1863 if (ext4fs_indir3_block
!= NULL
) {
1864 free(ext4fs_indir3_block
);
1865 ext4fs_indir3_block
= NULL
;
1866 ext4fs_indir3_size
= 0;
1867 ext4fs_indir3_blkno
= -1;
1871 int ext4fs_iterate_dir(struct ext2fs_node
*dir
, char *name
,
1872 struct ext2fs_node
**fnode
, int *ftype
)
1874 unsigned int fpos
= 0;
1876 struct ext2fs_node
*diro
= (struct ext2fs_node
*) dir
;
1880 printf("Iterate dir %s\n", name
);
1881 #endif /* of DEBUG */
1882 if (!diro
->inode_read
) {
1883 status
= ext4fs_read_inode(diro
->data
, diro
->ino
, &diro
->inode
);
1887 /* Search the file. */
1888 while (fpos
< __le32_to_cpu(diro
->inode
.size
)) {
1889 struct ext2_dirent dirent
;
1891 status
= ext4fs_read_file(diro
, fpos
,
1892 sizeof(struct ext2_dirent
),
1897 if (dirent
.namelen
!= 0) {
1898 char filename
[dirent
.namelen
+ 1];
1899 struct ext2fs_node
*fdiro
;
1900 int type
= FILETYPE_UNKNOWN
;
1902 status
= ext4fs_read_file(diro
,
1904 sizeof(struct ext2_dirent
),
1905 dirent
.namelen
, filename
);
1909 fdiro
= zalloc(sizeof(struct ext2fs_node
));
1913 fdiro
->data
= diro
->data
;
1914 fdiro
->ino
= __le32_to_cpu(dirent
.inode
);
1916 filename
[dirent
.namelen
] = '\0';
1918 if (dirent
.filetype
!= FILETYPE_UNKNOWN
) {
1919 fdiro
->inode_read
= 0;
1921 if (dirent
.filetype
== FILETYPE_DIRECTORY
)
1922 type
= FILETYPE_DIRECTORY
;
1923 else if (dirent
.filetype
== FILETYPE_SYMLINK
)
1924 type
= FILETYPE_SYMLINK
;
1925 else if (dirent
.filetype
== FILETYPE_REG
)
1926 type
= FILETYPE_REG
;
1928 status
= ext4fs_read_inode(diro
->data
,
1936 fdiro
->inode_read
= 1;
1938 if ((__le16_to_cpu(fdiro
->inode
.mode
) &
1939 FILETYPE_INO_MASK
) ==
1940 FILETYPE_INO_DIRECTORY
) {
1941 type
= FILETYPE_DIRECTORY
;
1942 } else if ((__le16_to_cpu(fdiro
->inode
.mode
)
1943 & FILETYPE_INO_MASK
) ==
1944 FILETYPE_INO_SYMLINK
) {
1945 type
= FILETYPE_SYMLINK
;
1946 } else if ((__le16_to_cpu(fdiro
->inode
.mode
)
1947 & FILETYPE_INO_MASK
) ==
1949 type
= FILETYPE_REG
;
1953 printf("iterate >%s<\n", filename
);
1954 #endif /* of DEBUG */
1955 if ((name
!= NULL
) && (fnode
!= NULL
)
1956 && (ftype
!= NULL
)) {
1957 if (strcmp(filename
, name
) == 0) {
1963 if (fdiro
->inode_read
== 0) {
1964 status
= ext4fs_read_inode(diro
->data
,
1972 fdiro
->inode_read
= 1;
1975 case FILETYPE_DIRECTORY
:
1978 case FILETYPE_SYMLINK
:
1989 __le32_to_cpu(fdiro
->inode
.size
),
1994 fpos
+= __le16_to_cpu(dirent
.direntlen
);
1999 static char *ext4fs_read_symlink(struct ext2fs_node
*node
)
2002 struct ext2fs_node
*diro
= node
;
2005 if (!diro
->inode_read
) {
2006 status
= ext4fs_read_inode(diro
->data
, diro
->ino
, &diro
->inode
);
2010 symlink
= zalloc(__le32_to_cpu(diro
->inode
.size
) + 1);
2014 if (__le32_to_cpu(diro
->inode
.size
) <= 60) {
2015 strncpy(symlink
, diro
->inode
.b
.symlink
,
2016 __le32_to_cpu(diro
->inode
.size
));
2018 status
= ext4fs_read_file(diro
, 0,
2019 __le32_to_cpu(diro
->inode
.size
),
2026 symlink
[__le32_to_cpu(diro
->inode
.size
)] = '\0';
2030 static int ext4fs_find_file1(const char *currpath
,
2031 struct ext2fs_node
*currroot
,
2032 struct ext2fs_node
**currfound
, int *foundtype
)
2034 char fpath
[strlen(currpath
) + 1];
2038 int type
= FILETYPE_DIRECTORY
;
2039 struct ext2fs_node
*currnode
= currroot
;
2040 struct ext2fs_node
*oldnode
= currroot
;
2042 strncpy(fpath
, currpath
, strlen(currpath
) + 1);
2044 /* Remove all leading slashes. */
2045 while (*name
== '/')
2049 *currfound
= currnode
;
2056 /* Extract the actual part from the pathname. */
2057 next
= strchr(name
, '/');
2059 /* Remove all leading slashes. */
2060 while (*next
== '/')
2064 if (type
!= FILETYPE_DIRECTORY
) {
2065 ext4fs_free_node(currnode
, currroot
);
2071 /* Iterate over the directory. */
2072 found
= ext4fs_iterate_dir(currnode
, name
, &currnode
, &type
);
2079 /* Read in the symlink and follow it. */
2080 if (type
== FILETYPE_SYMLINK
) {
2083 /* Test if the symlink does not loop. */
2084 if (++symlinknest
== 8) {
2085 ext4fs_free_node(currnode
, currroot
);
2086 ext4fs_free_node(oldnode
, currroot
);
2090 symlink
= ext4fs_read_symlink(currnode
);
2091 ext4fs_free_node(currnode
, currroot
);
2094 ext4fs_free_node(oldnode
, currroot
);
2098 debug("Got symlink >%s<\n", symlink
);
2100 if (symlink
[0] == '/') {
2101 ext4fs_free_node(oldnode
, currroot
);
2102 oldnode
= &ext4fs_root
->diropen
;
2105 /* Lookup the node the symlink points to. */
2106 status
= ext4fs_find_file1(symlink
, oldnode
,
2112 ext4fs_free_node(oldnode
, currroot
);
2117 ext4fs_free_node(oldnode
, currroot
);
2119 /* Found the node! */
2120 if (!next
|| *next
== '\0') {
2121 *currfound
= currnode
;
2130 int ext4fs_find_file(const char *path
, struct ext2fs_node
*rootnode
,
2131 struct ext2fs_node
**foundnode
, int expecttype
)
2134 int foundtype
= FILETYPE_DIRECTORY
;
2140 status
= ext4fs_find_file1(path
, rootnode
, foundnode
, &foundtype
);
2144 /* Check if the node that was found was of the expected type. */
2145 if ((expecttype
== FILETYPE_REG
) && (foundtype
!= expecttype
))
2147 else if ((expecttype
== FILETYPE_DIRECTORY
)
2148 && (foundtype
!= expecttype
))
2154 int ext4fs_open(const char *filename
)
2156 struct ext2fs_node
*fdiro
= NULL
;
2160 if (ext4fs_root
== NULL
)
2164 status
= ext4fs_find_file(filename
, &ext4fs_root
->diropen
, &fdiro
,
2169 if (!fdiro
->inode_read
) {
2170 status
= ext4fs_read_inode(fdiro
->data
, fdiro
->ino
,
2175 len
= __le32_to_cpu(fdiro
->inode
.size
);
2176 ext4fs_file
= fdiro
;
2180 ext4fs_free_node(fdiro
, &ext4fs_root
->diropen
);
2185 int ext4fs_mount(unsigned part_length
)
2187 struct ext2_data
*data
;
2189 struct ext_filesystem
*fs
= get_fs();
2190 data
= zalloc(sizeof(struct ext2_data
));
2194 /* Read the superblock. */
2195 status
= ext4fs_devread(1 * 2, 0, sizeof(struct ext2_sblock
),
2196 (char *)&data
->sblock
);
2201 /* Make sure this is an ext2 filesystem. */
2202 if (__le16_to_cpu(data
->sblock
.magic
) != EXT2_MAGIC
)
2205 if (__le32_to_cpu(data
->sblock
.revision_level
== 0))
2208 fs
->inodesz
= __le16_to_cpu(data
->sblock
.inode_size
);
2210 debug("EXT2 rev %d, inode_size %d\n",
2211 __le32_to_cpu(data
->sblock
.revision_level
), fs
->inodesz
);
2213 data
->diropen
.data
= data
;
2214 data
->diropen
.ino
= 2;
2215 data
->diropen
.inode_read
= 1;
2216 data
->inode
= &data
->diropen
.inode
;
2218 status
= ext4fs_read_inode(data
, 2, data
->inode
);
2226 printf("Failed to mount ext2 filesystem...\n");