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 if (fs
->dev_desc
->block_read
) {
85 fs
->dev_desc
->block_read(fs
->dev_desc
->dev
,
86 startblock
, 1, sec_buf
);
88 memcpy((temp_ptr
+ remainder
),
89 (unsigned char *)buf
, size
);
90 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
91 startblock
, 1, sec_buf
);
94 if (size
>> log2blksz
!= 0) {
95 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
98 (unsigned long *)buf
);
100 fs
->dev_desc
->block_read(fs
->dev_desc
->dev
,
101 startblock
, 1, sec_buf
);
103 memcpy(temp_ptr
, buf
, size
);
104 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
106 (unsigned long *)sec_buf
);
111 static int _get_new_inode_no(unsigned char *buffer
)
113 struct ext_filesystem
*fs
= get_fs();
119 /* get the blocksize of the filesystem */
120 unsigned char *ptr
= buffer
;
121 while (*ptr
== 255) {
124 if (count
> ext4fs_root
->sblock
.inodes_per_group
)
128 for (j
= 0; j
< fs
->blksz
; j
++) {
133 status
= input
& operand
;
148 static int _get_new_blk_no(unsigned char *buffer
)
154 unsigned char *ptr
= buffer
;
155 struct ext_filesystem
*fs
= get_fs();
157 if (fs
->blksz
!= 1024)
162 while (*ptr
== 255) {
165 if (count
== (fs
->blksz
* 8))
169 for (j
= 0; j
< fs
->blksz
; j
++) {
174 status
= input
& operand
;
189 int ext4fs_set_block_bmap(long int blockno
, unsigned char *buffer
, int index
)
191 int i
, remainder
, status
;
192 unsigned char *ptr
= buffer
;
193 unsigned char operand
;
195 remainder
= blockno
% 8;
196 int blocksize
= EXT2_BLOCK_SIZE(ext4fs_root
);
198 i
= i
- (index
* blocksize
);
199 if (blocksize
!= 1024) {
201 operand
= 1 << remainder
;
202 status
= *ptr
& operand
;
206 *ptr
= *ptr
| operand
;
209 if (remainder
== 0) {
214 operand
= (1 << (remainder
- 1));
216 status
= *ptr
& operand
;
220 *ptr
= *ptr
| operand
;
225 void ext4fs_reset_block_bmap(long int blockno
, unsigned char *buffer
, int index
)
227 int i
, remainder
, status
;
228 unsigned char *ptr
= buffer
;
229 unsigned char operand
;
231 remainder
= blockno
% 8;
232 int blocksize
= EXT2_BLOCK_SIZE(ext4fs_root
);
234 i
= i
- (index
* blocksize
);
235 if (blocksize
!= 1024) {
237 operand
= (1 << remainder
);
238 status
= *ptr
& operand
;
240 *ptr
= *ptr
& ~(operand
);
242 if (remainder
== 0) {
247 operand
= (1 << (remainder
- 1));
249 status
= *ptr
& operand
;
251 *ptr
= *ptr
& ~(operand
);
255 int ext4fs_set_inode_bmap(int inode_no
, unsigned char *buffer
, int index
)
257 int i
, remainder
, status
;
258 unsigned char *ptr
= buffer
;
259 unsigned char operand
;
261 inode_no
-= (index
* ext4fs_root
->sblock
.inodes_per_group
);
263 remainder
= inode_no
% 8;
264 if (remainder
== 0) {
269 operand
= (1 << (remainder
- 1));
271 status
= *ptr
& operand
;
275 *ptr
= *ptr
| operand
;
280 void ext4fs_reset_inode_bmap(int inode_no
, unsigned char *buffer
, int index
)
282 int i
, remainder
, status
;
283 unsigned char *ptr
= buffer
;
284 unsigned char operand
;
286 inode_no
-= (index
* ext4fs_root
->sblock
.inodes_per_group
);
288 remainder
= inode_no
% 8;
289 if (remainder
== 0) {
294 operand
= (1 << (remainder
- 1));
296 status
= *ptr
& operand
;
298 *ptr
= *ptr
& ~(operand
);
301 int ext4fs_checksum_update(unsigned int i
)
303 struct ext2_block_group
*desc
;
304 struct ext_filesystem
*fs
= get_fs();
307 desc
= (struct ext2_block_group
*)&fs
->bgd
[i
];
308 if (fs
->sb
->feature_ro_compat
& EXT4_FEATURE_RO_COMPAT_GDT_CSUM
) {
309 int offset
= offsetof(struct ext2_block_group
, bg_checksum
);
311 crc
= ext2fs_crc16(~0, fs
->sb
->unique_id
,
312 sizeof(fs
->sb
->unique_id
));
313 crc
= ext2fs_crc16(crc
, &i
, sizeof(i
));
314 crc
= ext2fs_crc16(crc
, desc
, offset
);
315 offset
+= sizeof(desc
->bg_checksum
); /* skip checksum */
316 assert(offset
== sizeof(*desc
));
322 static int check_void_in_dentry(struct ext2_dirent
*dir
, char *filename
)
325 int sizeof_void_space
;
326 int new_entry_byte_reqd
;
327 short padding_factor
= 0;
329 if (dir
->namelen
% 4 != 0)
330 padding_factor
= 4 - (dir
->namelen
% 4);
332 dentry_length
= sizeof(struct ext2_dirent
) +
333 dir
->namelen
+ padding_factor
;
334 sizeof_void_space
= dir
->direntlen
- dentry_length
;
335 if (sizeof_void_space
== 0)
339 if (strlen(filename
) % 4 != 0)
340 padding_factor
= 4 - (strlen(filename
) % 4);
342 new_entry_byte_reqd
= strlen(filename
) +
343 sizeof(struct ext2_dirent
) + padding_factor
;
344 if (sizeof_void_space
>= new_entry_byte_reqd
) {
345 dir
->direntlen
= dentry_length
;
346 return sizeof_void_space
;
352 void ext4fs_update_parent_dentry(char *filename
, int *p_ino
, int file_type
)
354 unsigned int *zero_buffer
= NULL
;
355 char *root_first_block_buffer
= NULL
;
358 long int first_block_no_of_root
= 0;
359 long int previous_blknr
= -1;
361 short int padding_factor
= 0;
362 unsigned int new_entry_byte_reqd
;
363 unsigned int last_entry_dirlen
;
364 int sizeof_void_space
= 0;
368 struct ext_filesystem
*fs
= get_fs();
369 /* directory entry */
370 struct ext2_dirent
*dir
;
371 char *temp_dir
= NULL
;
373 zero_buffer
= zalloc(fs
->blksz
);
375 printf("No Memory\n");
378 root_first_block_buffer
= zalloc(fs
->blksz
);
379 if (!root_first_block_buffer
) {
381 printf("No Memory\n");
386 /* read the block no allocated to a file */
387 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
389 root_blknr
= read_allocated_block(g_parent_inode
,
391 if (root_blknr
== 0) {
392 first_block_no_of_root
= previous_blknr
;
395 previous_blknr
= root_blknr
;
398 status
= ext4fs_devread((lbaint_t
)first_block_no_of_root
400 0, fs
->blksz
, root_first_block_buffer
);
404 if (ext4fs_log_journal(root_first_block_buffer
, first_block_no_of_root
))
406 dir
= (struct ext2_dirent
*)root_first_block_buffer
;
408 while (dir
->direntlen
> 0) {
410 * blocksize-totalbytes because last directory length
411 * i.e. dir->direntlen is free availble space in the
412 * block that means it is a last entry of directory
416 /* traversing the each directory entry */
417 if (fs
->blksz
- totalbytes
== dir
->direntlen
) {
418 if (strlen(filename
) % 4 != 0)
419 padding_factor
= 4 - (strlen(filename
) % 4);
421 new_entry_byte_reqd
= strlen(filename
) +
422 sizeof(struct ext2_dirent
) + padding_factor
;
425 * update last directory entry length to its
426 * length because we are creating new directory
429 if (dir
->namelen
% 4 != 0)
430 padding_factor
= 4 - (dir
->namelen
% 4);
432 last_entry_dirlen
= dir
->namelen
+
433 sizeof(struct ext2_dirent
) + padding_factor
;
434 if ((fs
->blksz
- totalbytes
- last_entry_dirlen
) <
435 new_entry_byte_reqd
) {
436 printf("1st Block Full:Allocate new block\n");
438 if (direct_blk_idx
== INDIRECT_BLOCKS
- 1) {
439 printf("Directory exceeds limit\n");
442 g_parent_inode
->b
.blocks
.dir_blocks
443 [direct_blk_idx
] = ext4fs_get_new_blk_no();
444 if (g_parent_inode
->b
.blocks
.dir_blocks
445 [direct_blk_idx
] == -1) {
446 printf("no block left to assign\n");
450 ((uint64_t)g_parent_inode
->b
.
451 blocks
.dir_blocks
[direct_blk_idx
] *
452 (uint64_t)fs
->blksz
)), zero_buffer
, fs
->blksz
);
453 g_parent_inode
->size
=
454 g_parent_inode
->size
+ fs
->blksz
;
455 g_parent_inode
->blockcnt
=
456 g_parent_inode
->blockcnt
+ fs
->sect_perblk
;
457 if (ext4fs_put_metadata
458 (root_first_block_buffer
,
459 first_block_no_of_root
))
463 dir
->direntlen
= last_entry_dirlen
;
467 templength
= dir
->direntlen
;
468 totalbytes
= totalbytes
+ templength
;
469 sizeof_void_space
= check_void_in_dentry(dir
, filename
);
470 if (sizeof_void_space
)
473 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
476 /* make a pointer ready for creating next directory entry */
477 templength
= dir
->direntlen
;
478 totalbytes
= totalbytes
+ templength
;
479 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
481 /* get the next available inode number */
482 inodeno
= ext4fs_get_new_inode_no();
484 printf("no inode left to assign\n");
487 dir
->inode
= inodeno
;
488 if (sizeof_void_space
)
489 dir
->direntlen
= sizeof_void_space
;
491 dir
->direntlen
= fs
->blksz
- totalbytes
;
493 dir
->namelen
= strlen(filename
);
494 dir
->filetype
= FILETYPE_REG
; /* regular file */
495 temp_dir
= (char *)dir
;
496 temp_dir
= temp_dir
+ sizeof(struct ext2_dirent
);
497 memcpy(temp_dir
, filename
, strlen(filename
));
501 /* update or write the 1st block of root inode */
502 if (ext4fs_put_metadata(root_first_block_buffer
,
503 first_block_no_of_root
))
508 free(root_first_block_buffer
);
511 static int search_dir(struct ext2_inode
*parent_inode
, char *dirname
)
521 unsigned char *block_buffer
= NULL
;
522 struct ext2_dirent
*dir
= NULL
;
523 struct ext2_dirent
*previous_dir
= NULL
;
524 struct ext_filesystem
*fs
= get_fs();
526 /* read the block no allocated to a file */
527 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
529 blknr
= read_allocated_block(parent_inode
, direct_blk_idx
);
533 /* read the blocks of parenet inode */
534 block_buffer
= zalloc(fs
->blksz
);
538 status
= ext4fs_devread((lbaint_t
)blknr
* fs
->sect_perblk
,
539 0, fs
->blksz
, (char *)block_buffer
);
543 dir
= (struct ext2_dirent
*)block_buffer
;
546 while (dir
->direntlen
>= 0) {
548 * blocksize-totalbytes because last directory
549 * length i.e.,*dir->direntlen is free availble
550 * space in the block that means
551 * it is a last entry of directory entry
553 if (strlen(dirname
) == dir
->namelen
) {
554 if (strncmp(dirname
, ptr
+
555 sizeof(struct ext2_dirent
),
556 dir
->namelen
) == 0) {
557 previous_dir
->direntlen
+=
559 inodeno
= dir
->inode
;
566 if (fs
->blksz
- totalbytes
== dir
->direntlen
)
569 /* traversing the each directory entry */
570 templength
= dir
->direntlen
;
571 totalbytes
= totalbytes
+ templength
;
573 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
593 static int find_dir_depth(char *dirname
)
595 char *token
= strtok(dirname
, "/");
597 while (token
!= NULL
) {
598 token
= strtok(NULL
, "/");
601 return count
+ 1 + 1;
603 * for example for string /home/temp
604 * depth=home(1)+temp(1)+1 extra for NULL;
609 static int parse_path(char **arr
, char *dirname
)
611 char *token
= strtok(dirname
, "/");
615 arr
[i
] = zalloc(strlen("/") + 1);
618 memcpy(arr
[i
++], "/", strlen("/"));
620 /* add each path entry after root */
621 while (token
!= NULL
) {
622 arr
[i
] = zalloc(strlen(token
) + 1);
625 memcpy(arr
[i
++], token
, strlen(token
));
626 token
= strtok(NULL
, "/");
633 int ext4fs_iget(int inode_no
, struct ext2_inode
*inode
)
635 if (ext4fs_read_inode(ext4fs_root
, inode_no
, inode
) == 0)
642 * Function: ext4fs_get_parent_inode_num
643 * Return Value: inode Number of the parent directory of file/Directory to be
645 * dirname : Input parmater, input path name of the file/directory to be created
646 * dname : Output parameter, to be filled with the name of the directory
647 * extracted from dirname
649 int ext4fs_get_parent_inode_num(const char *dirname
, char *dname
, int flags
)
653 int matched_inode_no
;
654 int result_inode_no
= -1;
656 char *depth_dirname
= NULL
;
657 char *parse_dirname
= NULL
;
658 struct ext2_inode
*parent_inode
= NULL
;
659 struct ext2_inode
*first_inode
= NULL
;
660 struct ext2_inode temp_inode
;
662 if (*dirname
!= '/') {
663 printf("Please supply Absolute path\n");
667 /* TODO: input validation make equivalent to linux */
668 depth_dirname
= zalloc(strlen(dirname
) + 1);
672 memcpy(depth_dirname
, dirname
, strlen(dirname
));
673 depth
= find_dir_depth(depth_dirname
);
674 parse_dirname
= zalloc(strlen(dirname
) + 1);
677 memcpy(parse_dirname
, dirname
, strlen(dirname
));
679 /* allocate memory for each directory level */
680 ptr
= zalloc((depth
) * sizeof(char *));
683 if (parse_path(ptr
, parse_dirname
))
685 parent_inode
= zalloc(sizeof(struct ext2_inode
));
688 first_inode
= zalloc(sizeof(struct ext2_inode
));
691 memcpy(parent_inode
, ext4fs_root
->inode
, sizeof(struct ext2_inode
));
692 memcpy(first_inode
, parent_inode
, sizeof(struct ext2_inode
));
694 result_inode_no
= EXT2_ROOT_INO
;
695 for (i
= 1; i
< depth
; i
++) {
696 matched_inode_no
= search_dir(parent_inode
, ptr
[i
]);
697 if (matched_inode_no
== -1) {
698 if (ptr
[i
+ 1] == NULL
&& i
== 1) {
699 result_inode_no
= EXT2_ROOT_INO
;
702 if (ptr
[i
+ 1] == NULL
)
704 printf("Invalid path\n");
705 result_inode_no
= -1;
709 if (ptr
[i
+ 1] != NULL
) {
710 memset(parent_inode
, '\0',
711 sizeof(struct ext2_inode
));
712 if (ext4fs_iget(matched_inode_no
,
714 result_inode_no
= -1;
717 result_inode_no
= matched_inode_no
;
726 matched_inode_no
= search_dir(first_inode
, ptr
[i
]);
728 matched_inode_no
= search_dir(parent_inode
, ptr
[i
]);
730 if (matched_inode_no
!= -1) {
731 ext4fs_iget(matched_inode_no
, &temp_inode
);
732 if (temp_inode
.mode
& S_IFDIR
) {
733 printf("It is a Directory\n");
734 result_inode_no
= -1;
739 if (strlen(ptr
[i
]) > 256) {
740 result_inode_no
= -1;
743 memcpy(dname
, ptr
[i
], strlen(ptr
[i
]));
748 for (i
= 0; i
< depth
; i
++) {
757 return result_inode_no
;
760 static int check_filename(char *filename
, unsigned int blknr
)
762 unsigned int first_block_no_of_root
;
767 char *root_first_block_buffer
= NULL
;
768 char *root_first_block_addr
= NULL
;
769 struct ext2_dirent
*dir
= NULL
;
770 struct ext2_dirent
*previous_dir
= NULL
;
772 struct ext_filesystem
*fs
= get_fs();
775 /* get the first block of root */
776 first_block_no_of_root
= blknr
;
777 root_first_block_buffer
= zalloc(fs
->blksz
);
778 if (!root_first_block_buffer
)
780 root_first_block_addr
= root_first_block_buffer
;
781 status
= ext4fs_devread((lbaint_t
)first_block_no_of_root
*
783 fs
->blksz
, root_first_block_buffer
);
787 if (ext4fs_log_journal(root_first_block_buffer
, first_block_no_of_root
))
789 dir
= (struct ext2_dirent
*)root_first_block_buffer
;
792 while (dir
->direntlen
>= 0) {
794 * blocksize-totalbytes because last
795 * directory length i.e., *dir->direntlen
796 * is free availble space in the block that
797 * means it is a last entry of directory entry
799 if (strlen(filename
) == dir
->namelen
) {
800 if (strncmp(filename
, ptr
+ sizeof(struct ext2_dirent
),
801 dir
->namelen
) == 0) {
802 printf("file found deleting\n");
803 previous_dir
->direntlen
+= dir
->direntlen
;
804 inodeno
= dir
->inode
;
811 if (fs
->blksz
- totalbytes
== dir
->direntlen
)
814 /* traversing the each directory entry */
815 templength
= dir
->direntlen
;
816 totalbytes
= totalbytes
+ templength
;
818 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
824 if (ext4fs_put_metadata(root_first_block_addr
,
825 first_block_no_of_root
))
830 free(root_first_block_buffer
);
835 int ext4fs_filename_check(char *filename
)
837 short direct_blk_idx
= 0;
841 /* read the block no allocated to a file */
842 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
844 blknr
= read_allocated_block(g_parent_inode
, direct_blk_idx
);
847 inodeno
= check_filename(filename
, blknr
);
855 long int ext4fs_get_new_blk_no(void)
861 static int prev_bg_bitmap_index
= -1;
862 unsigned int blk_per_grp
= ext4fs_root
->sblock
.blocks_per_group
;
863 struct ext_filesystem
*fs
= get_fs();
864 char *journal_buffer
= zalloc(fs
->blksz
);
865 char *zero_buffer
= zalloc(fs
->blksz
);
866 if (!journal_buffer
|| !zero_buffer
)
868 struct ext2_block_group
*bgd
= (struct ext2_block_group
*)fs
->gdtable
;
870 if (fs
->first_pass_bbmap
== 0) {
871 for (i
= 0; i
< fs
->no_blkgrp
; i
++) {
872 if (bgd
[i
].free_blocks
) {
873 if (bgd
[i
].bg_flags
& EXT4_BG_BLOCK_UNINIT
) {
874 put_ext4(((uint64_t) ((uint64_t)bgd
[i
].block_id
*
875 (uint64_t)fs
->blksz
)),
876 zero_buffer
, fs
->blksz
);
879 bg_flags
& ~EXT4_BG_BLOCK_UNINIT
;
880 memcpy(fs
->blk_bmaps
[i
], zero_buffer
,
884 _get_new_blk_no(fs
->blk_bmaps
[i
]);
885 if (fs
->curr_blkno
== -1)
886 /* if block bitmap is completely fill */
888 fs
->curr_blkno
= fs
->curr_blkno
+
890 fs
->first_pass_bbmap
++;
891 bgd
[i
].free_blocks
--;
892 fs
->sb
->free_blocks
--;
893 status
= ext4fs_devread((lbaint_t
)
900 if (ext4fs_log_journal(journal_buffer
,
905 debug("no space left on block group %d\n", i
);
913 /* get the blockbitmap index respective to blockno */
914 bg_idx
= fs
->curr_blkno
/ blk_per_grp
;
915 if (fs
->blksz
== 1024) {
916 remainder
= fs
->curr_blkno
% blk_per_grp
;
922 * To skip completely filled block group bitmaps
923 * Optimize the block allocation
925 if (bg_idx
>= fs
->no_blkgrp
)
928 if (bgd
[bg_idx
].free_blocks
== 0) {
929 debug("block group %u is full. Skipping\n", bg_idx
);
930 fs
->curr_blkno
= fs
->curr_blkno
+ blk_per_grp
;
935 if (bgd
[bg_idx
].bg_flags
& EXT4_BG_BLOCK_UNINIT
) {
936 memset(zero_buffer
, '\0', fs
->blksz
);
937 put_ext4(((uint64_t) ((uint64_t)bgd
[bg_idx
].block_id
*
938 (uint64_t)fs
->blksz
)), zero_buffer
, fs
->blksz
);
939 memcpy(fs
->blk_bmaps
[bg_idx
], zero_buffer
, fs
->blksz
);
940 bgd
[bg_idx
].bg_flags
= bgd
[bg_idx
].bg_flags
&
941 ~EXT4_BG_BLOCK_UNINIT
;
944 if (ext4fs_set_block_bmap(fs
->curr_blkno
, fs
->blk_bmaps
[bg_idx
],
946 debug("going for restart for the block no %ld %u\n",
947 fs
->curr_blkno
, bg_idx
);
952 if (prev_bg_bitmap_index
!= bg_idx
) {
953 memset(journal_buffer
, '\0', fs
->blksz
);
954 status
= ext4fs_devread((lbaint_t
)bgd
[bg_idx
].block_id
956 0, fs
->blksz
, journal_buffer
);
959 if (ext4fs_log_journal(journal_buffer
,
960 bgd
[bg_idx
].block_id
))
963 prev_bg_bitmap_index
= bg_idx
;
965 bgd
[bg_idx
].free_blocks
--;
966 fs
->sb
->free_blocks
--;
970 free(journal_buffer
);
973 return fs
->curr_blkno
;
975 free(journal_buffer
);
981 int ext4fs_get_new_inode_no(void)
985 unsigned int ibmap_idx
;
986 static int prev_inode_bitmap_index
= -1;
987 unsigned int inodes_per_grp
= ext4fs_root
->sblock
.inodes_per_group
;
988 struct ext_filesystem
*fs
= get_fs();
989 char *journal_buffer
= zalloc(fs
->blksz
);
990 char *zero_buffer
= zalloc(fs
->blksz
);
991 if (!journal_buffer
|| !zero_buffer
)
993 struct ext2_block_group
*bgd
= (struct ext2_block_group
*)fs
->gdtable
;
995 if (fs
->first_pass_ibmap
== 0) {
996 for (i
= 0; i
< fs
->no_blkgrp
; i
++) {
997 if (bgd
[i
].free_inodes
) {
998 if (bgd
[i
].bg_itable_unused
!=
1000 bgd
[i
].bg_itable_unused
=
1002 if (bgd
[i
].bg_flags
& EXT4_BG_INODE_UNINIT
) {
1003 put_ext4(((uint64_t)
1004 ((uint64_t)bgd
[i
].inode_id
*
1005 (uint64_t)fs
->blksz
)),
1006 zero_buffer
, fs
->blksz
);
1007 bgd
[i
].bg_flags
= bgd
[i
].bg_flags
&
1008 ~EXT4_BG_INODE_UNINIT
;
1009 memcpy(fs
->inode_bmaps
[i
],
1010 zero_buffer
, fs
->blksz
);
1013 _get_new_inode_no(fs
->inode_bmaps
[i
]);
1014 if (fs
->curr_inode_no
== -1)
1015 /* if block bitmap is completely fill */
1017 fs
->curr_inode_no
= fs
->curr_inode_no
+
1018 (i
* inodes_per_grp
);
1019 fs
->first_pass_ibmap
++;
1020 bgd
[i
].free_inodes
--;
1021 bgd
[i
].bg_itable_unused
--;
1022 fs
->sb
->free_inodes
--;
1023 status
= ext4fs_devread((lbaint_t
)
1030 if (ext4fs_log_journal(journal_buffer
,
1035 debug("no inode left on block group %d\n", i
);
1040 fs
->curr_inode_no
++;
1041 /* get the blockbitmap index respective to blockno */
1042 ibmap_idx
= fs
->curr_inode_no
/ inodes_per_grp
;
1043 if (bgd
[ibmap_idx
].bg_flags
& EXT4_BG_INODE_UNINIT
) {
1044 memset(zero_buffer
, '\0', fs
->blksz
);
1045 put_ext4(((uint64_t) ((uint64_t)bgd
[ibmap_idx
].inode_id
*
1046 (uint64_t)fs
->blksz
)), zero_buffer
,
1048 bgd
[ibmap_idx
].bg_flags
=
1049 bgd
[ibmap_idx
].bg_flags
& ~EXT4_BG_INODE_UNINIT
;
1050 memcpy(fs
->inode_bmaps
[ibmap_idx
], zero_buffer
,
1054 if (ext4fs_set_inode_bmap(fs
->curr_inode_no
,
1055 fs
->inode_bmaps
[ibmap_idx
],
1057 debug("going for restart for the block no %d %u\n",
1058 fs
->curr_inode_no
, ibmap_idx
);
1062 /* journal backup */
1063 if (prev_inode_bitmap_index
!= ibmap_idx
) {
1064 memset(journal_buffer
, '\0', fs
->blksz
);
1065 status
= ext4fs_devread((lbaint_t
)
1066 bgd
[ibmap_idx
].inode_id
1068 0, fs
->blksz
, journal_buffer
);
1071 if (ext4fs_log_journal(journal_buffer
,
1072 bgd
[ibmap_idx
].inode_id
))
1074 prev_inode_bitmap_index
= ibmap_idx
;
1076 if (bgd
[ibmap_idx
].bg_itable_unused
!=
1077 bgd
[ibmap_idx
].free_inodes
)
1078 bgd
[ibmap_idx
].bg_itable_unused
=
1079 bgd
[ibmap_idx
].free_inodes
;
1080 bgd
[ibmap_idx
].free_inodes
--;
1081 bgd
[ibmap_idx
].bg_itable_unused
--;
1082 fs
->sb
->free_inodes
--;
1087 free(journal_buffer
);
1090 return fs
->curr_inode_no
;
1092 free(journal_buffer
);
1100 static void alloc_single_indirect_block(struct ext2_inode
*file_inode
,
1101 unsigned int *total_remaining_blocks
,
1102 unsigned int *no_blks_reqd
)
1106 long int actual_block_no
;
1107 long int si_blockno
;
1108 /* si :single indirect */
1109 unsigned int *si_buffer
= NULL
;
1110 unsigned int *si_start_addr
= NULL
;
1111 struct ext_filesystem
*fs
= get_fs();
1113 if (*total_remaining_blocks
!= 0) {
1114 si_buffer
= zalloc(fs
->blksz
);
1116 printf("No Memory\n");
1119 si_start_addr
= si_buffer
;
1120 si_blockno
= ext4fs_get_new_blk_no();
1121 if (si_blockno
== -1) {
1122 printf("no block left to assign\n");
1126 debug("SIPB %ld: %u\n", si_blockno
, *total_remaining_blocks
);
1128 status
= ext4fs_devread((lbaint_t
)si_blockno
* fs
->sect_perblk
,
1129 0, fs
->blksz
, (char *)si_buffer
);
1130 memset(si_buffer
, '\0', fs
->blksz
);
1134 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1135 actual_block_no
= ext4fs_get_new_blk_no();
1136 if (actual_block_no
== -1) {
1137 printf("no block left to assign\n");
1140 *si_buffer
= actual_block_no
;
1141 debug("SIAB %u: %u\n", *si_buffer
,
1142 *total_remaining_blocks
);
1145 (*total_remaining_blocks
)--;
1146 if (*total_remaining_blocks
== 0)
1150 /* write the block to disk */
1151 put_ext4(((uint64_t) ((uint64_t)si_blockno
* (uint64_t)fs
->blksz
)),
1152 si_start_addr
, fs
->blksz
);
1153 file_inode
->b
.blocks
.indir_block
= si_blockno
;
1156 free(si_start_addr
);
1159 static void alloc_double_indirect_block(struct ext2_inode
*file_inode
,
1160 unsigned int *total_remaining_blocks
,
1161 unsigned int *no_blks_reqd
)
1166 long int actual_block_no
;
1167 /* di:double indirect */
1168 long int di_blockno_parent
;
1169 long int di_blockno_child
;
1170 unsigned int *di_parent_buffer
= NULL
;
1171 unsigned int *di_child_buff
= NULL
;
1172 unsigned int *di_block_start_addr
= NULL
;
1173 unsigned int *di_child_buff_start
= NULL
;
1174 struct ext_filesystem
*fs
= get_fs();
1176 if (*total_remaining_blocks
!= 0) {
1177 /* double indirect parent block connecting to inode */
1178 di_blockno_parent
= ext4fs_get_new_blk_no();
1179 if (di_blockno_parent
== -1) {
1180 printf("no block left to assign\n");
1183 di_parent_buffer
= zalloc(fs
->blksz
);
1184 if (!di_parent_buffer
)
1187 di_block_start_addr
= di_parent_buffer
;
1189 debug("DIPB %ld: %u\n", di_blockno_parent
,
1190 *total_remaining_blocks
);
1192 status
= ext4fs_devread((lbaint_t
)di_blockno_parent
*
1194 fs
->blksz
, (char *)di_parent_buffer
);
1197 printf("%s: Device read error!\n", __func__
);
1200 memset(di_parent_buffer
, '\0', fs
->blksz
);
1203 * start:for each double indirect parent
1204 * block create one more block
1206 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1207 di_blockno_child
= ext4fs_get_new_blk_no();
1208 if (di_blockno_child
== -1) {
1209 printf("no block left to assign\n");
1212 di_child_buff
= zalloc(fs
->blksz
);
1216 di_child_buff_start
= di_child_buff
;
1217 *di_parent_buffer
= di_blockno_child
;
1220 debug("DICB %ld: %u\n", di_blockno_child
,
1221 *total_remaining_blocks
);
1223 status
= ext4fs_devread((lbaint_t
)di_blockno_child
*
1226 (char *)di_child_buff
);
1229 printf("%s: Device read error!\n", __func__
);
1232 memset(di_child_buff
, '\0', fs
->blksz
);
1233 /* filling of actual datablocks for each child */
1234 for (j
= 0; j
< (fs
->blksz
/ sizeof(int)); j
++) {
1235 actual_block_no
= ext4fs_get_new_blk_no();
1236 if (actual_block_no
== -1) {
1237 printf("no block left to assign\n");
1240 *di_child_buff
= actual_block_no
;
1241 debug("DIAB %ld: %u\n", actual_block_no
,
1242 *total_remaining_blocks
);
1245 (*total_remaining_blocks
)--;
1246 if (*total_remaining_blocks
== 0)
1249 /* write the block table */
1250 put_ext4(((uint64_t) ((uint64_t)di_blockno_child
* (uint64_t)fs
->blksz
)),
1251 di_child_buff_start
, fs
->blksz
);
1252 free(di_child_buff_start
);
1253 di_child_buff_start
= NULL
;
1255 if (*total_remaining_blocks
== 0)
1258 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent
* (uint64_t)fs
->blksz
)),
1259 di_block_start_addr
, fs
->blksz
);
1260 file_inode
->b
.blocks
.double_indir_block
= di_blockno_parent
;
1263 free(di_block_start_addr
);
1266 static void alloc_triple_indirect_block(struct ext2_inode
*file_inode
,
1267 unsigned int *total_remaining_blocks
,
1268 unsigned int *no_blks_reqd
)
1273 long int actual_block_no
;
1274 /* ti: Triple Indirect */
1275 long int ti_gp_blockno
;
1276 long int ti_parent_blockno
;
1277 long int ti_child_blockno
;
1278 unsigned int *ti_gp_buff
= NULL
;
1279 unsigned int *ti_parent_buff
= NULL
;
1280 unsigned int *ti_child_buff
= NULL
;
1281 unsigned int *ti_gp_buff_start_addr
= NULL
;
1282 unsigned int *ti_pbuff_start_addr
= NULL
;
1283 unsigned int *ti_cbuff_start_addr
= NULL
;
1284 struct ext_filesystem
*fs
= get_fs();
1285 if (*total_remaining_blocks
!= 0) {
1286 /* triple indirect grand parent block connecting to inode */
1287 ti_gp_blockno
= ext4fs_get_new_blk_no();
1288 if (ti_gp_blockno
== -1) {
1289 printf("no block left to assign\n");
1292 ti_gp_buff
= zalloc(fs
->blksz
);
1296 ti_gp_buff_start_addr
= ti_gp_buff
;
1298 debug("TIGPB %ld: %u\n", ti_gp_blockno
,
1299 *total_remaining_blocks
);
1301 /* for each 4 byte grand parent entry create one more block */
1302 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1303 ti_parent_blockno
= ext4fs_get_new_blk_no();
1304 if (ti_parent_blockno
== -1) {
1305 printf("no block left to assign\n");
1308 ti_parent_buff
= zalloc(fs
->blksz
);
1309 if (!ti_parent_buff
)
1312 ti_pbuff_start_addr
= ti_parent_buff
;
1313 *ti_gp_buff
= ti_parent_blockno
;
1316 debug("TIPB %ld: %u\n", ti_parent_blockno
,
1317 *total_remaining_blocks
);
1319 /* for each 4 byte entry parent create one more block */
1320 for (j
= 0; j
< (fs
->blksz
/ sizeof(int)); j
++) {
1321 ti_child_blockno
= ext4fs_get_new_blk_no();
1322 if (ti_child_blockno
== -1) {
1323 printf("no block left assign\n");
1326 ti_child_buff
= zalloc(fs
->blksz
);
1330 ti_cbuff_start_addr
= ti_child_buff
;
1331 *ti_parent_buff
= ti_child_blockno
;
1334 debug("TICB %ld: %u\n", ti_parent_blockno
,
1335 *total_remaining_blocks
);
1337 /* fill actual datablocks for each child */
1338 for (k
= 0; k
< (fs
->blksz
/ sizeof(int));
1341 ext4fs_get_new_blk_no();
1342 if (actual_block_no
== -1) {
1343 printf("no block left\n");
1346 *ti_child_buff
= actual_block_no
;
1347 debug("TIAB %ld: %u\n", actual_block_no
,
1348 *total_remaining_blocks
);
1351 (*total_remaining_blocks
)--;
1352 if (*total_remaining_blocks
== 0)
1355 /* write the child block */
1356 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno
*
1357 (uint64_t)fs
->blksz
)),
1358 ti_cbuff_start_addr
, fs
->blksz
);
1359 free(ti_cbuff_start_addr
);
1361 if (*total_remaining_blocks
== 0)
1364 /* write the parent block */
1365 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno
* (uint64_t)fs
->blksz
)),
1366 ti_pbuff_start_addr
, fs
->blksz
);
1367 free(ti_pbuff_start_addr
);
1369 if (*total_remaining_blocks
== 0)
1372 /* write the grand parent block */
1373 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno
* (uint64_t)fs
->blksz
)),
1374 ti_gp_buff_start_addr
, fs
->blksz
);
1375 file_inode
->b
.blocks
.triple_indir_block
= ti_gp_blockno
;
1378 free(ti_gp_buff_start_addr
);
1381 void ext4fs_allocate_blocks(struct ext2_inode
*file_inode
,
1382 unsigned int total_remaining_blocks
,
1383 unsigned int *total_no_of_block
)
1386 long int direct_blockno
;
1387 unsigned int no_blks_reqd
= 0;
1389 /* allocation of direct blocks */
1390 for (i
= 0; total_remaining_blocks
&& i
< INDIRECT_BLOCKS
; i
++) {
1391 direct_blockno
= ext4fs_get_new_blk_no();
1392 if (direct_blockno
== -1) {
1393 printf("no block left to assign\n");
1396 file_inode
->b
.blocks
.dir_blocks
[i
] = direct_blockno
;
1397 debug("DB %ld: %u\n", direct_blockno
, total_remaining_blocks
);
1399 total_remaining_blocks
--;
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 int blksz
= EXT2_BLOCK_SIZE(data
);
1424 index
= (struct ext4_extent_idx
*)(ext_block
+ 1);
1426 if (le16_to_cpu(ext_block
->eh_magic
) != EXT4_EXT_MAGIC
)
1429 if (ext_block
->eh_depth
== 0)
1434 if (i
>= le16_to_cpu(ext_block
->eh_entries
))
1436 } while (fileblock
>= le32_to_cpu(index
[i
].ei_block
));
1441 block
= le16_to_cpu(index
[i
].ei_leaf_hi
);
1442 block
= (block
<< 32) + le32_to_cpu(index
[i
].ei_leaf_lo
);
1444 if (ext4fs_devread((lbaint_t
)block
<< log2_blksz
, 0, blksz
,
1446 ext_block
= (struct ext4_extent_header
*)buf
;
1452 static int ext4fs_blockgroup
1453 (struct ext2_data
*data
, int group
, struct ext2_block_group
*blkgrp
)
1456 unsigned int blkoff
, desc_per_blk
;
1457 int log2blksz
= get_fs()->dev_desc
->log2blksz
;
1459 desc_per_blk
= EXT2_BLOCK_SIZE(data
) / sizeof(struct ext2_block_group
);
1461 blkno
= __le32_to_cpu(data
->sblock
.first_data_block
) + 1 +
1462 group
/ desc_per_blk
;
1463 blkoff
= (group
% desc_per_blk
) * sizeof(struct ext2_block_group
);
1465 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1466 group
, blkno
, blkoff
);
1468 return ext4fs_devread((lbaint_t
)blkno
<<
1469 (LOG2_BLOCK_SIZE(data
) - log2blksz
),
1470 blkoff
, sizeof(struct ext2_block_group
),
1474 int ext4fs_read_inode(struct ext2_data
*data
, int ino
, struct ext2_inode
*inode
)
1476 struct ext2_block_group blkgrp
;
1477 struct ext2_sblock
*sblock
= &data
->sblock
;
1478 struct ext_filesystem
*fs
= get_fs();
1479 int log2blksz
= get_fs()->dev_desc
->log2blksz
;
1480 int inodes_per_block
, status
;
1482 unsigned int blkoff
;
1484 /* It is easier to calculate if the first inode is 0. */
1486 status
= ext4fs_blockgroup(data
, ino
/ __le32_to_cpu
1487 (sblock
->inodes_per_group
), &blkgrp
);
1491 inodes_per_block
= EXT2_BLOCK_SIZE(data
) / fs
->inodesz
;
1492 blkno
= __le32_to_cpu(blkgrp
.inode_table_id
) +
1493 (ino
% __le32_to_cpu(sblock
->inodes_per_group
)) / inodes_per_block
;
1494 blkoff
= (ino
% inodes_per_block
) * fs
->inodesz
;
1495 /* Read the inode. */
1496 status
= ext4fs_devread((lbaint_t
)blkno
<< (LOG2_BLOCK_SIZE(data
) -
1498 sizeof(struct ext2_inode
), (char *)inode
);
1505 long int read_allocated_block(struct ext2_inode
*inode
, int fileblock
)
1512 long int perblock_parent
;
1513 long int perblock_child
;
1514 unsigned long long start
;
1515 /* get the blocksize of the filesystem */
1516 blksz
= EXT2_BLOCK_SIZE(ext4fs_root
);
1517 log2_blksz
= LOG2_BLOCK_SIZE(ext4fs_root
)
1518 - get_fs()->dev_desc
->log2blksz
;
1520 if (le32_to_cpu(inode
->flags
) & EXT4_EXTENTS_FL
) {
1521 char *buf
= zalloc(blksz
);
1524 struct ext4_extent_header
*ext_block
;
1525 struct ext4_extent
*extent
;
1528 ext4fs_get_extent_block(ext4fs_root
, buf
,
1529 (struct ext4_extent_header
*)
1530 inode
->b
.blocks
.dir_blocks
,
1531 fileblock
, log2_blksz
);
1533 printf("invalid extent block\n");
1538 extent
= (struct ext4_extent
*)(ext_block
+ 1);
1542 if (i
>= le16_to_cpu(ext_block
->eh_entries
))
1544 } while (fileblock
>= le32_to_cpu(extent
[i
].ee_block
));
1546 fileblock
-= le32_to_cpu(extent
[i
].ee_block
);
1547 if (fileblock
>= le16_to_cpu(extent
[i
].ee_len
)) {
1552 start
= le16_to_cpu(extent
[i
].ee_start_hi
);
1553 start
= (start
<< 32) +
1554 le32_to_cpu(extent
[i
].ee_start_lo
);
1556 return fileblock
+ start
;
1559 printf("Extent Error\n");
1564 /* Direct blocks. */
1565 if (fileblock
< INDIRECT_BLOCKS
)
1566 blknr
= __le32_to_cpu(inode
->b
.blocks
.dir_blocks
[fileblock
]);
1569 else if (fileblock
< (INDIRECT_BLOCKS
+ (blksz
/ 4))) {
1570 if (ext4fs_indir1_block
== NULL
) {
1571 ext4fs_indir1_block
= zalloc(blksz
);
1572 if (ext4fs_indir1_block
== NULL
) {
1573 printf("** SI ext2fs read block (indir 1)"
1574 "malloc failed. **\n");
1577 ext4fs_indir1_size
= blksz
;
1578 ext4fs_indir1_blkno
= -1;
1580 if (blksz
!= ext4fs_indir1_size
) {
1581 free(ext4fs_indir1_block
);
1582 ext4fs_indir1_block
= NULL
;
1583 ext4fs_indir1_size
= 0;
1584 ext4fs_indir1_blkno
= -1;
1585 ext4fs_indir1_block
= zalloc(blksz
);
1586 if (ext4fs_indir1_block
== NULL
) {
1587 printf("** SI ext2fs read block (indir 1):"
1588 "malloc failed. **\n");
1591 ext4fs_indir1_size
= blksz
;
1593 if ((__le32_to_cpu(inode
->b
.blocks
.indir_block
) <<
1594 log2_blksz
) != ext4fs_indir1_blkno
) {
1596 ext4fs_devread((lbaint_t
)__le32_to_cpu
1598 indir_block
) << log2_blksz
, 0,
1599 blksz
, (char *)ext4fs_indir1_block
);
1601 printf("** SI ext2fs read block (indir 1)"
1605 ext4fs_indir1_blkno
=
1606 __le32_to_cpu(inode
->b
.blocks
.
1607 indir_block
) << log2_blksz
;
1609 blknr
= __le32_to_cpu(ext4fs_indir1_block
1610 [fileblock
- INDIRECT_BLOCKS
]);
1612 /* Double indirect. */
1613 else if (fileblock
< (INDIRECT_BLOCKS
+ (blksz
/ 4 *
1614 (blksz
/ 4 + 1)))) {
1616 long int perblock
= blksz
/ 4;
1617 long int rblock
= fileblock
- (INDIRECT_BLOCKS
+ blksz
/ 4);
1619 if (ext4fs_indir1_block
== NULL
) {
1620 ext4fs_indir1_block
= zalloc(blksz
);
1621 if (ext4fs_indir1_block
== NULL
) {
1622 printf("** DI ext2fs read block (indir 2 1)"
1623 "malloc failed. **\n");
1626 ext4fs_indir1_size
= blksz
;
1627 ext4fs_indir1_blkno
= -1;
1629 if (blksz
!= ext4fs_indir1_size
) {
1630 free(ext4fs_indir1_block
);
1631 ext4fs_indir1_block
= NULL
;
1632 ext4fs_indir1_size
= 0;
1633 ext4fs_indir1_blkno
= -1;
1634 ext4fs_indir1_block
= zalloc(blksz
);
1635 if (ext4fs_indir1_block
== NULL
) {
1636 printf("** DI ext2fs read block (indir 2 1)"
1637 "malloc failed. **\n");
1640 ext4fs_indir1_size
= blksz
;
1642 if ((__le32_to_cpu(inode
->b
.blocks
.double_indir_block
) <<
1643 log2_blksz
) != ext4fs_indir1_blkno
) {
1645 ext4fs_devread((lbaint_t
)__le32_to_cpu
1647 double_indir_block
) << log2_blksz
,
1649 (char *)ext4fs_indir1_block
);
1651 printf("** DI ext2fs read block (indir 2 1)"
1655 ext4fs_indir1_blkno
=
1656 __le32_to_cpu(inode
->b
.blocks
.double_indir_block
) <<
1660 if (ext4fs_indir2_block
== NULL
) {
1661 ext4fs_indir2_block
= zalloc(blksz
);
1662 if (ext4fs_indir2_block
== NULL
) {
1663 printf("** DI ext2fs read block (indir 2 2)"
1664 "malloc failed. **\n");
1667 ext4fs_indir2_size
= blksz
;
1668 ext4fs_indir2_blkno
= -1;
1670 if (blksz
!= ext4fs_indir2_size
) {
1671 free(ext4fs_indir2_block
);
1672 ext4fs_indir2_block
= NULL
;
1673 ext4fs_indir2_size
= 0;
1674 ext4fs_indir2_blkno
= -1;
1675 ext4fs_indir2_block
= zalloc(blksz
);
1676 if (ext4fs_indir2_block
== NULL
) {
1677 printf("** DI ext2fs read block (indir 2 2)"
1678 "malloc failed. **\n");
1681 ext4fs_indir2_size
= blksz
;
1683 if ((__le32_to_cpu(ext4fs_indir1_block
[rblock
/ perblock
]) <<
1684 log2_blksz
) != ext4fs_indir2_blkno
) {
1685 status
= ext4fs_devread((lbaint_t
)__le32_to_cpu
1686 (ext4fs_indir1_block
1688 perblock
]) << log2_blksz
, 0,
1690 (char *)ext4fs_indir2_block
);
1692 printf("** DI ext2fs read block (indir 2 2)"
1696 ext4fs_indir2_blkno
=
1697 __le32_to_cpu(ext4fs_indir1_block
[rblock
1702 blknr
= __le32_to_cpu(ext4fs_indir2_block
[rblock
% perblock
]);
1704 /* Tripple indirect. */
1706 rblock
= fileblock
- (INDIRECT_BLOCKS
+ blksz
/ 4 +
1707 (blksz
/ 4 * blksz
/ 4));
1708 perblock_child
= blksz
/ 4;
1709 perblock_parent
= ((blksz
/ 4) * (blksz
/ 4));
1711 if (ext4fs_indir1_block
== NULL
) {
1712 ext4fs_indir1_block
= zalloc(blksz
);
1713 if (ext4fs_indir1_block
== NULL
) {
1714 printf("** TI ext2fs read block (indir 2 1)"
1715 "malloc failed. **\n");
1718 ext4fs_indir1_size
= blksz
;
1719 ext4fs_indir1_blkno
= -1;
1721 if (blksz
!= ext4fs_indir1_size
) {
1722 free(ext4fs_indir1_block
);
1723 ext4fs_indir1_block
= NULL
;
1724 ext4fs_indir1_size
= 0;
1725 ext4fs_indir1_blkno
= -1;
1726 ext4fs_indir1_block
= zalloc(blksz
);
1727 if (ext4fs_indir1_block
== NULL
) {
1728 printf("** TI ext2fs read block (indir 2 1)"
1729 "malloc failed. **\n");
1732 ext4fs_indir1_size
= blksz
;
1734 if ((__le32_to_cpu(inode
->b
.blocks
.triple_indir_block
) <<
1735 log2_blksz
) != ext4fs_indir1_blkno
) {
1736 status
= ext4fs_devread
1738 __le32_to_cpu(inode
->b
.blocks
.triple_indir_block
)
1739 << log2_blksz
, 0, blksz
,
1740 (char *)ext4fs_indir1_block
);
1742 printf("** TI ext2fs read block (indir 2 1)"
1746 ext4fs_indir1_blkno
=
1747 __le32_to_cpu(inode
->b
.blocks
.triple_indir_block
) <<
1751 if (ext4fs_indir2_block
== NULL
) {
1752 ext4fs_indir2_block
= zalloc(blksz
);
1753 if (ext4fs_indir2_block
== NULL
) {
1754 printf("** TI ext2fs read block (indir 2 2)"
1755 "malloc failed. **\n");
1758 ext4fs_indir2_size
= blksz
;
1759 ext4fs_indir2_blkno
= -1;
1761 if (blksz
!= ext4fs_indir2_size
) {
1762 free(ext4fs_indir2_block
);
1763 ext4fs_indir2_block
= NULL
;
1764 ext4fs_indir2_size
= 0;
1765 ext4fs_indir2_blkno
= -1;
1766 ext4fs_indir2_block
= zalloc(blksz
);
1767 if (ext4fs_indir2_block
== NULL
) {
1768 printf("** TI ext2fs read block (indir 2 2)"
1769 "malloc failed. **\n");
1772 ext4fs_indir2_size
= blksz
;
1774 if ((__le32_to_cpu(ext4fs_indir1_block
[rblock
/
1775 perblock_parent
]) <<
1777 != ext4fs_indir2_blkno
) {
1778 status
= ext4fs_devread((lbaint_t
)__le32_to_cpu
1779 (ext4fs_indir1_block
1781 perblock_parent
]) <<
1782 log2_blksz
, 0, blksz
,
1783 (char *)ext4fs_indir2_block
);
1785 printf("** TI ext2fs read block (indir 2 2)"
1789 ext4fs_indir2_blkno
=
1790 __le32_to_cpu(ext4fs_indir1_block
[rblock
/
1795 if (ext4fs_indir3_block
== NULL
) {
1796 ext4fs_indir3_block
= zalloc(blksz
);
1797 if (ext4fs_indir3_block
== NULL
) {
1798 printf("** TI ext2fs read block (indir 2 2)"
1799 "malloc failed. **\n");
1802 ext4fs_indir3_size
= blksz
;
1803 ext4fs_indir3_blkno
= -1;
1805 if (blksz
!= ext4fs_indir3_size
) {
1806 free(ext4fs_indir3_block
);
1807 ext4fs_indir3_block
= NULL
;
1808 ext4fs_indir3_size
= 0;
1809 ext4fs_indir3_blkno
= -1;
1810 ext4fs_indir3_block
= zalloc(blksz
);
1811 if (ext4fs_indir3_block
== NULL
) {
1812 printf("** TI ext2fs read block (indir 2 2)"
1813 "malloc failed. **\n");
1816 ext4fs_indir3_size
= blksz
;
1818 if ((__le32_to_cpu(ext4fs_indir2_block
[rblock
1821 log2_blksz
) != ext4fs_indir3_blkno
) {
1823 ext4fs_devread((lbaint_t
)__le32_to_cpu
1824 (ext4fs_indir2_block
1825 [(rblock
/ perblock_child
)
1826 % (blksz
/ 4)]) << log2_blksz
, 0,
1827 blksz
, (char *)ext4fs_indir3_block
);
1829 printf("** TI ext2fs read block (indir 2 2)"
1833 ext4fs_indir3_blkno
=
1834 __le32_to_cpu(ext4fs_indir2_block
[(rblock
/
1841 blknr
= __le32_to_cpu(ext4fs_indir3_block
1842 [rblock
% perblock_child
]);
1844 debug("read_allocated_block %ld\n", blknr
);
1850 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1853 * This function assures that for a file with the same name but different size
1854 * the sequential store on the ext4 filesystem will be correct.
1856 * In this function the global data, responsible for internal representation
1857 * of the ext4 data are initialized to the reset state. Without this, during
1858 * replacement of the smaller file with the bigger truncation of new file was
1861 void ext4fs_reinit_global(void)
1863 if (ext4fs_indir1_block
!= NULL
) {
1864 free(ext4fs_indir1_block
);
1865 ext4fs_indir1_block
= NULL
;
1866 ext4fs_indir1_size
= 0;
1867 ext4fs_indir1_blkno
= -1;
1869 if (ext4fs_indir2_block
!= NULL
) {
1870 free(ext4fs_indir2_block
);
1871 ext4fs_indir2_block
= NULL
;
1872 ext4fs_indir2_size
= 0;
1873 ext4fs_indir2_blkno
= -1;
1875 if (ext4fs_indir3_block
!= NULL
) {
1876 free(ext4fs_indir3_block
);
1877 ext4fs_indir3_block
= NULL
;
1878 ext4fs_indir3_size
= 0;
1879 ext4fs_indir3_blkno
= -1;
1882 void ext4fs_close(void)
1884 if ((ext4fs_file
!= NULL
) && (ext4fs_root
!= NULL
)) {
1885 ext4fs_free_node(ext4fs_file
, &ext4fs_root
->diropen
);
1888 if (ext4fs_root
!= NULL
) {
1893 ext4fs_reinit_global();
1896 int ext4fs_iterate_dir(struct ext2fs_node
*dir
, char *name
,
1897 struct ext2fs_node
**fnode
, int *ftype
)
1899 unsigned int fpos
= 0;
1902 struct ext2fs_node
*diro
= (struct ext2fs_node
*) dir
;
1906 printf("Iterate dir %s\n", name
);
1907 #endif /* of DEBUG */
1908 if (!diro
->inode_read
) {
1909 status
= ext4fs_read_inode(diro
->data
, diro
->ino
, &diro
->inode
);
1913 /* Search the file. */
1914 while (fpos
< __le32_to_cpu(diro
->inode
.size
)) {
1915 struct ext2_dirent dirent
;
1917 status
= ext4fs_read_file(diro
, fpos
,
1918 sizeof(struct ext2_dirent
),
1919 (char *)&dirent
, &actread
);
1923 if (dirent
.namelen
!= 0) {
1924 char filename
[dirent
.namelen
+ 1];
1925 struct ext2fs_node
*fdiro
;
1926 int type
= FILETYPE_UNKNOWN
;
1928 status
= ext4fs_read_file(diro
,
1930 sizeof(struct ext2_dirent
),
1931 dirent
.namelen
, filename
,
1936 fdiro
= zalloc(sizeof(struct ext2fs_node
));
1940 fdiro
->data
= diro
->data
;
1941 fdiro
->ino
= __le32_to_cpu(dirent
.inode
);
1943 filename
[dirent
.namelen
] = '\0';
1945 if (dirent
.filetype
!= FILETYPE_UNKNOWN
) {
1946 fdiro
->inode_read
= 0;
1948 if (dirent
.filetype
== FILETYPE_DIRECTORY
)
1949 type
= FILETYPE_DIRECTORY
;
1950 else if (dirent
.filetype
== FILETYPE_SYMLINK
)
1951 type
= FILETYPE_SYMLINK
;
1952 else if (dirent
.filetype
== FILETYPE_REG
)
1953 type
= FILETYPE_REG
;
1955 status
= ext4fs_read_inode(diro
->data
,
1963 fdiro
->inode_read
= 1;
1965 if ((__le16_to_cpu(fdiro
->inode
.mode
) &
1966 FILETYPE_INO_MASK
) ==
1967 FILETYPE_INO_DIRECTORY
) {
1968 type
= FILETYPE_DIRECTORY
;
1969 } else if ((__le16_to_cpu(fdiro
->inode
.mode
)
1970 & FILETYPE_INO_MASK
) ==
1971 FILETYPE_INO_SYMLINK
) {
1972 type
= FILETYPE_SYMLINK
;
1973 } else if ((__le16_to_cpu(fdiro
->inode
.mode
)
1974 & FILETYPE_INO_MASK
) ==
1976 type
= FILETYPE_REG
;
1980 printf("iterate >%s<\n", filename
);
1981 #endif /* of DEBUG */
1982 if ((name
!= NULL
) && (fnode
!= NULL
)
1983 && (ftype
!= NULL
)) {
1984 if (strcmp(filename
, name
) == 0) {
1990 if (fdiro
->inode_read
== 0) {
1991 status
= ext4fs_read_inode(diro
->data
,
1999 fdiro
->inode_read
= 1;
2002 case FILETYPE_DIRECTORY
:
2005 case FILETYPE_SYMLINK
:
2016 __le32_to_cpu(fdiro
->inode
.size
),
2021 fpos
+= __le16_to_cpu(dirent
.direntlen
);
2026 static char *ext4fs_read_symlink(struct ext2fs_node
*node
)
2029 struct ext2fs_node
*diro
= node
;
2033 if (!diro
->inode_read
) {
2034 status
= ext4fs_read_inode(diro
->data
, diro
->ino
, &diro
->inode
);
2038 symlink
= zalloc(__le32_to_cpu(diro
->inode
.size
) + 1);
2042 if (__le32_to_cpu(diro
->inode
.size
) <= 60) {
2043 strncpy(symlink
, diro
->inode
.b
.symlink
,
2044 __le32_to_cpu(diro
->inode
.size
));
2046 status
= ext4fs_read_file(diro
, 0,
2047 __le32_to_cpu(diro
->inode
.size
),
2049 if ((status
< 0) || (actread
== 0)) {
2054 symlink
[__le32_to_cpu(diro
->inode
.size
)] = '\0';
2058 static int ext4fs_find_file1(const char *currpath
,
2059 struct ext2fs_node
*currroot
,
2060 struct ext2fs_node
**currfound
, int *foundtype
)
2062 char fpath
[strlen(currpath
) + 1];
2066 int type
= FILETYPE_DIRECTORY
;
2067 struct ext2fs_node
*currnode
= currroot
;
2068 struct ext2fs_node
*oldnode
= currroot
;
2070 strncpy(fpath
, currpath
, strlen(currpath
) + 1);
2072 /* Remove all leading slashes. */
2073 while (*name
== '/')
2077 *currfound
= currnode
;
2084 /* Extract the actual part from the pathname. */
2085 next
= strchr(name
, '/');
2087 /* Remove all leading slashes. */
2088 while (*next
== '/')
2092 if (type
!= FILETYPE_DIRECTORY
) {
2093 ext4fs_free_node(currnode
, currroot
);
2099 /* Iterate over the directory. */
2100 found
= ext4fs_iterate_dir(currnode
, name
, &currnode
, &type
);
2107 /* Read in the symlink and follow it. */
2108 if (type
== FILETYPE_SYMLINK
) {
2111 /* Test if the symlink does not loop. */
2112 if (++symlinknest
== 8) {
2113 ext4fs_free_node(currnode
, currroot
);
2114 ext4fs_free_node(oldnode
, currroot
);
2118 symlink
= ext4fs_read_symlink(currnode
);
2119 ext4fs_free_node(currnode
, currroot
);
2122 ext4fs_free_node(oldnode
, currroot
);
2126 debug("Got symlink >%s<\n", symlink
);
2128 if (symlink
[0] == '/') {
2129 ext4fs_free_node(oldnode
, currroot
);
2130 oldnode
= &ext4fs_root
->diropen
;
2133 /* Lookup the node the symlink points to. */
2134 status
= ext4fs_find_file1(symlink
, oldnode
,
2140 ext4fs_free_node(oldnode
, currroot
);
2145 ext4fs_free_node(oldnode
, currroot
);
2147 /* Found the node! */
2148 if (!next
|| *next
== '\0') {
2149 *currfound
= currnode
;
2158 int ext4fs_find_file(const char *path
, struct ext2fs_node
*rootnode
,
2159 struct ext2fs_node
**foundnode
, int expecttype
)
2162 int foundtype
= FILETYPE_DIRECTORY
;
2168 status
= ext4fs_find_file1(path
, rootnode
, foundnode
, &foundtype
);
2172 /* Check if the node that was found was of the expected type. */
2173 if ((expecttype
== FILETYPE_REG
) && (foundtype
!= expecttype
))
2175 else if ((expecttype
== FILETYPE_DIRECTORY
)
2176 && (foundtype
!= expecttype
))
2182 int ext4fs_open(const char *filename
, loff_t
*len
)
2184 struct ext2fs_node
*fdiro
= NULL
;
2187 if (ext4fs_root
== NULL
)
2191 status
= ext4fs_find_file(filename
, &ext4fs_root
->diropen
, &fdiro
,
2196 if (!fdiro
->inode_read
) {
2197 status
= ext4fs_read_inode(fdiro
->data
, fdiro
->ino
,
2202 *len
= __le32_to_cpu(fdiro
->inode
.size
);
2203 ext4fs_file
= fdiro
;
2207 ext4fs_free_node(fdiro
, &ext4fs_root
->diropen
);
2212 int ext4fs_mount(unsigned part_length
)
2214 struct ext2_data
*data
;
2216 struct ext_filesystem
*fs
= get_fs();
2217 data
= zalloc(SUPERBLOCK_SIZE
);
2221 /* Read the superblock. */
2222 status
= ext4_read_superblock((char *)&data
->sblock
);
2227 /* Make sure this is an ext2 filesystem. */
2228 if (__le16_to_cpu(data
->sblock
.magic
) != EXT2_MAGIC
)
2231 if (__le32_to_cpu(data
->sblock
.revision_level
== 0))
2234 fs
->inodesz
= __le16_to_cpu(data
->sblock
.inode_size
);
2236 debug("EXT2 rev %d, inode_size %d\n",
2237 __le32_to_cpu(data
->sblock
.revision_level
), fs
->inodesz
);
2239 data
->diropen
.data
= data
;
2240 data
->diropen
.ino
= 2;
2241 data
->diropen
.inode_read
= 1;
2242 data
->inode
= &data
->diropen
.inode
;
2244 status
= ext4fs_read_inode(data
, 2, data
->inode
);
2252 printf("Failed to mount ext2 filesystem...\n");