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>
27 #include <linux/stat.h>
28 #include <linux/time.h>
29 #include <asm/byteorder.h>
30 #include "ext4_common.h"
32 struct ext2_data
*ext4fs_root
;
33 struct ext2fs_node
*ext4fs_file
;
34 uint32_t *ext4fs_indir1_block
;
35 int ext4fs_indir1_size
;
36 int ext4fs_indir1_blkno
= -1;
37 uint32_t *ext4fs_indir2_block
;
38 int ext4fs_indir2_size
;
39 int ext4fs_indir2_blkno
= -1;
41 uint32_t *ext4fs_indir3_block
;
42 int ext4fs_indir3_size
;
43 int ext4fs_indir3_blkno
= -1;
44 struct ext2_inode
*g_parent_inode
;
45 static int symlinknest
;
47 #if defined(CONFIG_EXT4_WRITE)
48 uint32_t ext4fs_div_roundup(uint32_t size
, uint32_t n
)
50 uint32_t res
= size
/ n
;
57 void put_ext4(uint64_t off
, void *buf
, uint32_t size
)
61 unsigned char *temp_ptr
= NULL
;
62 struct ext_filesystem
*fs
= get_fs();
63 int log2blksz
= fs
->dev_desc
->log2blksz
;
64 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf
, fs
->dev_desc
->blksz
);
66 startblock
= off
>> log2blksz
;
67 startblock
+= part_offset
;
68 remainder
= off
& (uint64_t)(fs
->dev_desc
->blksz
- 1);
70 if (fs
->dev_desc
== NULL
)
73 if ((startblock
+ (size
>> log2blksz
)) >
74 (part_offset
+ fs
->total_sect
)) {
75 printf("part_offset is " LBAFU
"\n", part_offset
);
76 printf("total_sector is %llu\n", fs
->total_sect
);
77 printf("error: overflow occurs\n");
82 if (fs
->dev_desc
->block_read
) {
83 fs
->dev_desc
->block_read(fs
->dev_desc
->dev
,
84 startblock
, 1, sec_buf
);
86 memcpy((temp_ptr
+ remainder
),
87 (unsigned char *)buf
, size
);
88 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
89 startblock
, 1, sec_buf
);
92 if (size
>> log2blksz
!= 0) {
93 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
96 (unsigned long *)buf
);
98 fs
->dev_desc
->block_read(fs
->dev_desc
->dev
,
99 startblock
, 1, sec_buf
);
101 memcpy(temp_ptr
, buf
, size
);
102 fs
->dev_desc
->block_write(fs
->dev_desc
->dev
,
104 (unsigned long *)sec_buf
);
109 static int _get_new_inode_no(unsigned char *buffer
)
111 struct ext_filesystem
*fs
= get_fs();
117 /* get the blocksize of the filesystem */
118 unsigned char *ptr
= buffer
;
119 while (*ptr
== 255) {
122 if (count
> ext4fs_root
->sblock
.inodes_per_group
)
126 for (j
= 0; j
< fs
->blksz
; j
++) {
131 status
= input
& operand
;
146 static int _get_new_blk_no(unsigned char *buffer
)
152 unsigned char *ptr
= buffer
;
153 struct ext_filesystem
*fs
= get_fs();
155 if (fs
->blksz
!= 1024)
160 while (*ptr
== 255) {
163 if (count
== (fs
->blksz
* 8))
167 for (j
= 0; j
< fs
->blksz
; j
++) {
172 status
= input
& operand
;
187 int ext4fs_set_block_bmap(long int blockno
, unsigned char *buffer
, int index
)
189 int i
, remainder
, status
;
190 unsigned char *ptr
= buffer
;
191 unsigned char operand
;
193 remainder
= blockno
% 8;
194 int blocksize
= EXT2_BLOCK_SIZE(ext4fs_root
);
196 i
= i
- (index
* blocksize
);
197 if (blocksize
!= 1024) {
199 operand
= 1 << remainder
;
200 status
= *ptr
& operand
;
204 *ptr
= *ptr
| operand
;
207 if (remainder
== 0) {
212 operand
= (1 << (remainder
- 1));
214 status
= *ptr
& operand
;
218 *ptr
= *ptr
| operand
;
223 void ext4fs_reset_block_bmap(long int blockno
, unsigned char *buffer
, int index
)
225 int i
, remainder
, status
;
226 unsigned char *ptr
= buffer
;
227 unsigned char operand
;
229 remainder
= blockno
% 8;
230 int blocksize
= EXT2_BLOCK_SIZE(ext4fs_root
);
232 i
= i
- (index
* blocksize
);
233 if (blocksize
!= 1024) {
235 operand
= (1 << remainder
);
236 status
= *ptr
& operand
;
238 *ptr
= *ptr
& ~(operand
);
240 if (remainder
== 0) {
245 operand
= (1 << (remainder
- 1));
247 status
= *ptr
& operand
;
249 *ptr
= *ptr
& ~(operand
);
253 int ext4fs_set_inode_bmap(int inode_no
, unsigned char *buffer
, int index
)
255 int i
, remainder
, status
;
256 unsigned char *ptr
= buffer
;
257 unsigned char operand
;
259 inode_no
-= (index
* ext4fs_root
->sblock
.inodes_per_group
);
261 remainder
= inode_no
% 8;
262 if (remainder
== 0) {
267 operand
= (1 << (remainder
- 1));
269 status
= *ptr
& operand
;
273 *ptr
= *ptr
| operand
;
278 void ext4fs_reset_inode_bmap(int inode_no
, unsigned char *buffer
, int index
)
280 int i
, remainder
, status
;
281 unsigned char *ptr
= buffer
;
282 unsigned char operand
;
284 inode_no
-= (index
* ext4fs_root
->sblock
.inodes_per_group
);
286 remainder
= inode_no
% 8;
287 if (remainder
== 0) {
292 operand
= (1 << (remainder
- 1));
294 status
= *ptr
& operand
;
296 *ptr
= *ptr
& ~(operand
);
299 int ext4fs_checksum_update(unsigned int i
)
301 struct ext2_block_group
*desc
;
302 struct ext_filesystem
*fs
= get_fs();
305 desc
= (struct ext2_block_group
*)&fs
->bgd
[i
];
306 if (fs
->sb
->feature_ro_compat
& EXT4_FEATURE_RO_COMPAT_GDT_CSUM
) {
307 int offset
= offsetof(struct ext2_block_group
, bg_checksum
);
309 crc
= ext2fs_crc16(~0, fs
->sb
->unique_id
,
310 sizeof(fs
->sb
->unique_id
));
311 crc
= ext2fs_crc16(crc
, &i
, sizeof(i
));
312 crc
= ext2fs_crc16(crc
, desc
, offset
);
313 offset
+= sizeof(desc
->bg_checksum
); /* skip checksum */
314 assert(offset
== sizeof(*desc
));
320 static int check_void_in_dentry(struct ext2_dirent
*dir
, char *filename
)
323 int sizeof_void_space
;
324 int new_entry_byte_reqd
;
325 short padding_factor
= 0;
327 if (dir
->namelen
% 4 != 0)
328 padding_factor
= 4 - (dir
->namelen
% 4);
330 dentry_length
= sizeof(struct ext2_dirent
) +
331 dir
->namelen
+ padding_factor
;
332 sizeof_void_space
= dir
->direntlen
- dentry_length
;
333 if (sizeof_void_space
== 0)
337 if (strlen(filename
) % 4 != 0)
338 padding_factor
= 4 - (strlen(filename
) % 4);
340 new_entry_byte_reqd
= strlen(filename
) +
341 sizeof(struct ext2_dirent
) + padding_factor
;
342 if (sizeof_void_space
>= new_entry_byte_reqd
) {
343 dir
->direntlen
= dentry_length
;
344 return sizeof_void_space
;
350 void ext4fs_update_parent_dentry(char *filename
, int *p_ino
, int file_type
)
352 unsigned int *zero_buffer
= NULL
;
353 char *root_first_block_buffer
= NULL
;
356 long int first_block_no_of_root
= 0;
357 long int previous_blknr
= -1;
359 short int padding_factor
= 0;
360 unsigned int new_entry_byte_reqd
;
361 unsigned int last_entry_dirlen
;
362 int sizeof_void_space
= 0;
366 struct ext_filesystem
*fs
= get_fs();
367 /* directory entry */
368 struct ext2_dirent
*dir
;
369 char *temp_dir
= NULL
;
371 zero_buffer
= zalloc(fs
->blksz
);
373 printf("No Memory\n");
376 root_first_block_buffer
= zalloc(fs
->blksz
);
377 if (!root_first_block_buffer
) {
379 printf("No Memory\n");
384 /* read the block no allocated to a file */
385 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
387 root_blknr
= read_allocated_block(g_parent_inode
,
389 if (root_blknr
== 0) {
390 first_block_no_of_root
= previous_blknr
;
393 previous_blknr
= root_blknr
;
396 status
= ext4fs_devread((lbaint_t
)first_block_no_of_root
398 0, fs
->blksz
, root_first_block_buffer
);
402 if (ext4fs_log_journal(root_first_block_buffer
, first_block_no_of_root
))
404 dir
= (struct ext2_dirent
*)root_first_block_buffer
;
406 while (dir
->direntlen
> 0) {
408 * blocksize-totalbytes because last directory length
409 * i.e. dir->direntlen is free availble space in the
410 * block that means it is a last entry of directory
414 /* traversing the each directory entry */
415 if (fs
->blksz
- totalbytes
== dir
->direntlen
) {
416 if (strlen(filename
) % 4 != 0)
417 padding_factor
= 4 - (strlen(filename
) % 4);
419 new_entry_byte_reqd
= strlen(filename
) +
420 sizeof(struct ext2_dirent
) + padding_factor
;
423 * update last directory entry length to its
424 * length because we are creating new directory
427 if (dir
->namelen
% 4 != 0)
428 padding_factor
= 4 - (dir
->namelen
% 4);
430 last_entry_dirlen
= dir
->namelen
+
431 sizeof(struct ext2_dirent
) + padding_factor
;
432 if ((fs
->blksz
- totalbytes
- last_entry_dirlen
) <
433 new_entry_byte_reqd
) {
434 printf("1st Block Full:Allocate new block\n");
436 if (direct_blk_idx
== INDIRECT_BLOCKS
- 1) {
437 printf("Directory exceeds limit\n");
440 g_parent_inode
->b
.blocks
.dir_blocks
441 [direct_blk_idx
] = ext4fs_get_new_blk_no();
442 if (g_parent_inode
->b
.blocks
.dir_blocks
443 [direct_blk_idx
] == -1) {
444 printf("no block left to assign\n");
449 blocks
.dir_blocks
[direct_blk_idx
] *
450 fs
->blksz
)), zero_buffer
, fs
->blksz
);
451 g_parent_inode
->size
=
452 g_parent_inode
->size
+ fs
->blksz
;
453 g_parent_inode
->blockcnt
=
454 g_parent_inode
->blockcnt
+ fs
->sect_perblk
;
455 if (ext4fs_put_metadata
456 (root_first_block_buffer
,
457 first_block_no_of_root
))
461 dir
->direntlen
= last_entry_dirlen
;
465 templength
= dir
->direntlen
;
466 totalbytes
= totalbytes
+ templength
;
467 sizeof_void_space
= check_void_in_dentry(dir
, filename
);
468 if (sizeof_void_space
)
471 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
474 /* make a pointer ready for creating next directory entry */
475 templength
= dir
->direntlen
;
476 totalbytes
= totalbytes
+ templength
;
477 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
479 /* get the next available inode number */
480 inodeno
= ext4fs_get_new_inode_no();
482 printf("no inode left to assign\n");
485 dir
->inode
= inodeno
;
486 if (sizeof_void_space
)
487 dir
->direntlen
= sizeof_void_space
;
489 dir
->direntlen
= fs
->blksz
- totalbytes
;
491 dir
->namelen
= strlen(filename
);
492 dir
->filetype
= FILETYPE_REG
; /* regular file */
493 temp_dir
= (char *)dir
;
494 temp_dir
= temp_dir
+ sizeof(struct ext2_dirent
);
495 memcpy(temp_dir
, filename
, strlen(filename
));
499 /* update or write the 1st block of root inode */
500 if (ext4fs_put_metadata(root_first_block_buffer
,
501 first_block_no_of_root
))
506 free(root_first_block_buffer
);
509 static int search_dir(struct ext2_inode
*parent_inode
, char *dirname
)
519 unsigned char *block_buffer
= NULL
;
520 struct ext2_dirent
*dir
= NULL
;
521 struct ext2_dirent
*previous_dir
= NULL
;
522 struct ext_filesystem
*fs
= get_fs();
524 /* read the block no allocated to a file */
525 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
527 blknr
= read_allocated_block(parent_inode
, direct_blk_idx
);
531 /* read the blocks of parenet inode */
532 block_buffer
= zalloc(fs
->blksz
);
536 status
= ext4fs_devread((lbaint_t
)blknr
* fs
->sect_perblk
,
537 0, fs
->blksz
, (char *)block_buffer
);
541 dir
= (struct ext2_dirent
*)block_buffer
;
544 while (dir
->direntlen
>= 0) {
546 * blocksize-totalbytes because last directory
547 * length i.e.,*dir->direntlen is free availble
548 * space in the block that means
549 * it is a last entry of directory entry
551 if (strlen(dirname
) == dir
->namelen
) {
552 if (strncmp(dirname
, ptr
+
553 sizeof(struct ext2_dirent
),
554 dir
->namelen
) == 0) {
555 previous_dir
->direntlen
+=
557 inodeno
= dir
->inode
;
564 if (fs
->blksz
- totalbytes
== dir
->direntlen
)
567 /* traversing the each directory entry */
568 templength
= dir
->direntlen
;
569 totalbytes
= totalbytes
+ templength
;
571 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
591 static int find_dir_depth(char *dirname
)
593 char *token
= strtok(dirname
, "/");
595 while (token
!= NULL
) {
596 token
= strtok(NULL
, "/");
599 return count
+ 1 + 1;
601 * for example for string /home/temp
602 * depth=home(1)+temp(1)+1 extra for NULL;
607 static int parse_path(char **arr
, char *dirname
)
609 char *token
= strtok(dirname
, "/");
613 arr
[i
] = zalloc(strlen("/") + 1);
619 /* add each path entry after root */
620 while (token
!= NULL
) {
621 arr
[i
] = zalloc(strlen(token
) + 1);
624 memcpy(arr
[i
++], token
, strlen(token
));
625 token
= strtok(NULL
, "/");
632 int ext4fs_iget(int inode_no
, struct ext2_inode
*inode
)
634 if (ext4fs_read_inode(ext4fs_root
, inode_no
, inode
) == 0)
641 * Function: ext4fs_get_parent_inode_num
642 * Return Value: inode Number of the parent directory of file/Directory to be
644 * dirname : Input parmater, input path name of the file/directory to be created
645 * dname : Output parameter, to be filled with the name of the directory
646 * extracted from dirname
648 int ext4fs_get_parent_inode_num(const char *dirname
, char *dname
, int flags
)
652 int matched_inode_no
;
653 int result_inode_no
= -1;
655 char *depth_dirname
= NULL
;
656 char *parse_dirname
= NULL
;
657 struct ext2_inode
*parent_inode
= NULL
;
658 struct ext2_inode
*first_inode
= NULL
;
659 struct ext2_inode temp_inode
;
661 if (*dirname
!= '/') {
662 printf("Please supply Absolute path\n");
666 /* TODO: input validation make equivalent to linux */
667 depth_dirname
= zalloc(strlen(dirname
) + 1);
671 memcpy(depth_dirname
, dirname
, strlen(dirname
));
672 depth
= find_dir_depth(depth_dirname
);
673 parse_dirname
= zalloc(strlen(dirname
) + 1);
676 memcpy(parse_dirname
, dirname
, strlen(dirname
));
678 /* allocate memory for each directory level */
679 ptr
= zalloc((depth
) * sizeof(char *));
682 if (parse_path(ptr
, parse_dirname
))
684 parent_inode
= zalloc(sizeof(struct ext2_inode
));
687 first_inode
= zalloc(sizeof(struct ext2_inode
));
690 memcpy(parent_inode
, ext4fs_root
->inode
, sizeof(struct ext2_inode
));
691 memcpy(first_inode
, parent_inode
, sizeof(struct ext2_inode
));
693 result_inode_no
= EXT2_ROOT_INO
;
694 for (i
= 1; i
< depth
; i
++) {
695 matched_inode_no
= search_dir(parent_inode
, ptr
[i
]);
696 if (matched_inode_no
== -1) {
697 if (ptr
[i
+ 1] == NULL
&& i
== 1) {
698 result_inode_no
= EXT2_ROOT_INO
;
701 if (ptr
[i
+ 1] == NULL
)
703 printf("Invalid path\n");
704 result_inode_no
= -1;
708 if (ptr
[i
+ 1] != NULL
) {
709 memset(parent_inode
, '\0',
710 sizeof(struct ext2_inode
));
711 if (ext4fs_iget(matched_inode_no
,
713 result_inode_no
= -1;
716 result_inode_no
= matched_inode_no
;
725 matched_inode_no
= search_dir(first_inode
, ptr
[i
]);
727 matched_inode_no
= search_dir(parent_inode
, ptr
[i
]);
729 if (matched_inode_no
!= -1) {
730 ext4fs_iget(matched_inode_no
, &temp_inode
);
731 if (temp_inode
.mode
& S_IFDIR
) {
732 printf("It is a Directory\n");
733 result_inode_no
= -1;
738 if (strlen(ptr
[i
]) > 256) {
739 result_inode_no
= -1;
742 memcpy(dname
, ptr
[i
], strlen(ptr
[i
]));
751 return result_inode_no
;
754 static int check_filename(char *filename
, unsigned int blknr
)
756 unsigned int first_block_no_of_root
;
761 char *root_first_block_buffer
= NULL
;
762 char *root_first_block_addr
= NULL
;
763 struct ext2_dirent
*dir
= NULL
;
764 struct ext2_dirent
*previous_dir
= NULL
;
766 struct ext_filesystem
*fs
= get_fs();
768 /* get the first block of root */
769 first_block_no_of_root
= blknr
;
770 root_first_block_buffer
= zalloc(fs
->blksz
);
771 if (!root_first_block_buffer
)
773 root_first_block_addr
= root_first_block_buffer
;
774 status
= ext4fs_devread((lbaint_t
)first_block_no_of_root
*
776 fs
->blksz
, root_first_block_buffer
);
780 if (ext4fs_log_journal(root_first_block_buffer
, first_block_no_of_root
))
782 dir
= (struct ext2_dirent
*)root_first_block_buffer
;
785 while (dir
->direntlen
>= 0) {
787 * blocksize-totalbytes because last
788 * directory length i.e., *dir->direntlen
789 * is free availble space in the block that
790 * means it is a last entry of directory entry
792 if (strlen(filename
) == dir
->namelen
) {
793 if (strncmp(filename
, ptr
+ sizeof(struct ext2_dirent
),
794 dir
->namelen
) == 0) {
795 printf("file found deleting\n");
796 previous_dir
->direntlen
+= dir
->direntlen
;
797 inodeno
= dir
->inode
;
804 if (fs
->blksz
- totalbytes
== dir
->direntlen
)
807 /* traversing the each directory entry */
808 templength
= dir
->direntlen
;
809 totalbytes
= totalbytes
+ templength
;
811 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
817 if (ext4fs_put_metadata(root_first_block_addr
,
818 first_block_no_of_root
))
823 free(root_first_block_buffer
);
828 int ext4fs_filename_check(char *filename
)
830 short direct_blk_idx
= 0;
834 /* read the block no allocated to a file */
835 for (direct_blk_idx
= 0; direct_blk_idx
< INDIRECT_BLOCKS
;
837 blknr
= read_allocated_block(g_parent_inode
, direct_blk_idx
);
840 inodeno
= check_filename(filename
, blknr
);
848 long int ext4fs_get_new_blk_no(void)
854 static int prev_bg_bitmap_index
= -1;
855 unsigned int blk_per_grp
= ext4fs_root
->sblock
.blocks_per_group
;
856 struct ext_filesystem
*fs
= get_fs();
857 char *journal_buffer
= zalloc(fs
->blksz
);
858 char *zero_buffer
= zalloc(fs
->blksz
);
859 if (!journal_buffer
|| !zero_buffer
)
861 struct ext2_block_group
*bgd
= (struct ext2_block_group
*)fs
->gdtable
;
863 if (fs
->first_pass_bbmap
== 0) {
864 for (i
= 0; i
< fs
->no_blkgrp
; i
++) {
865 if (bgd
[i
].free_blocks
) {
866 if (bgd
[i
].bg_flags
& EXT4_BG_BLOCK_UNINIT
) {
867 put_ext4(((uint64_t) (bgd
[i
].block_id
*
869 zero_buffer
, fs
->blksz
);
872 bg_flags
& ~EXT4_BG_BLOCK_UNINIT
;
873 memcpy(fs
->blk_bmaps
[i
], zero_buffer
,
877 _get_new_blk_no(fs
->blk_bmaps
[i
]);
878 if (fs
->curr_blkno
== -1)
879 /* if block bitmap is completely fill */
881 fs
->curr_blkno
= fs
->curr_blkno
+
883 fs
->first_pass_bbmap
++;
884 bgd
[i
].free_blocks
--;
885 fs
->sb
->free_blocks
--;
886 status
= ext4fs_devread((lbaint_t
)
893 if (ext4fs_log_journal(journal_buffer
,
898 debug("no space left on block group %d\n", i
);
906 /* get the blockbitmap index respective to blockno */
907 if (fs
->blksz
!= 1024) {
908 bg_idx
= fs
->curr_blkno
/ blk_per_grp
;
910 bg_idx
= fs
->curr_blkno
/ blk_per_grp
;
911 remainder
= fs
->curr_blkno
% blk_per_grp
;
917 * To skip completely filled block group bitmaps
918 * Optimize the block allocation
920 if (bg_idx
>= fs
->no_blkgrp
)
923 if (bgd
[bg_idx
].free_blocks
== 0) {
924 debug("block group %u is full. Skipping\n", bg_idx
);
925 fs
->curr_blkno
= fs
->curr_blkno
+ blk_per_grp
;
930 if (bgd
[bg_idx
].bg_flags
& EXT4_BG_BLOCK_UNINIT
) {
931 memset(zero_buffer
, '\0', fs
->blksz
);
932 put_ext4(((uint64_t) (bgd
[bg_idx
].block_id
*
933 fs
->blksz
)), zero_buffer
, fs
->blksz
);
934 memcpy(fs
->blk_bmaps
[bg_idx
], zero_buffer
, fs
->blksz
);
935 bgd
[bg_idx
].bg_flags
= bgd
[bg_idx
].bg_flags
&
936 ~EXT4_BG_BLOCK_UNINIT
;
939 if (ext4fs_set_block_bmap(fs
->curr_blkno
, fs
->blk_bmaps
[bg_idx
],
941 debug("going for restart for the block no %ld %u\n",
942 fs
->curr_blkno
, bg_idx
);
947 if (prev_bg_bitmap_index
!= bg_idx
) {
948 memset(journal_buffer
, '\0', fs
->blksz
);
949 status
= ext4fs_devread((lbaint_t
)bgd
[bg_idx
].block_id
951 0, fs
->blksz
, journal_buffer
);
954 if (ext4fs_log_journal(journal_buffer
,
955 bgd
[bg_idx
].block_id
))
958 prev_bg_bitmap_index
= bg_idx
;
960 bgd
[bg_idx
].free_blocks
--;
961 fs
->sb
->free_blocks
--;
965 free(journal_buffer
);
968 return fs
->curr_blkno
;
970 free(journal_buffer
);
976 int ext4fs_get_new_inode_no(void)
980 unsigned int ibmap_idx
;
981 static int prev_inode_bitmap_index
= -1;
982 unsigned int inodes_per_grp
= ext4fs_root
->sblock
.inodes_per_group
;
983 struct ext_filesystem
*fs
= get_fs();
984 char *journal_buffer
= zalloc(fs
->blksz
);
985 char *zero_buffer
= zalloc(fs
->blksz
);
986 if (!journal_buffer
|| !zero_buffer
)
988 struct ext2_block_group
*bgd
= (struct ext2_block_group
*)fs
->gdtable
;
990 if (fs
->first_pass_ibmap
== 0) {
991 for (i
= 0; i
< fs
->no_blkgrp
; i
++) {
992 if (bgd
[i
].free_inodes
) {
993 if (bgd
[i
].bg_itable_unused
!=
995 bgd
[i
].bg_itable_unused
=
997 if (bgd
[i
].bg_flags
& EXT4_BG_INODE_UNINIT
) {
1001 zero_buffer
, fs
->blksz
);
1002 bgd
[i
].bg_flags
= bgd
[i
].bg_flags
&
1003 ~EXT4_BG_INODE_UNINIT
;
1004 memcpy(fs
->inode_bmaps
[i
],
1005 zero_buffer
, fs
->blksz
);
1008 _get_new_inode_no(fs
->inode_bmaps
[i
]);
1009 if (fs
->curr_inode_no
== -1)
1010 /* if block bitmap is completely fill */
1012 fs
->curr_inode_no
= fs
->curr_inode_no
+
1013 (i
* inodes_per_grp
);
1014 fs
->first_pass_ibmap
++;
1015 bgd
[i
].free_inodes
--;
1016 bgd
[i
].bg_itable_unused
--;
1017 fs
->sb
->free_inodes
--;
1018 status
= ext4fs_devread((lbaint_t
)
1025 if (ext4fs_log_journal(journal_buffer
,
1030 debug("no inode left on block group %d\n", i
);
1035 fs
->curr_inode_no
++;
1036 /* get the blockbitmap index respective to blockno */
1037 ibmap_idx
= fs
->curr_inode_no
/ inodes_per_grp
;
1038 if (bgd
[ibmap_idx
].bg_flags
& EXT4_BG_INODE_UNINIT
) {
1039 memset(zero_buffer
, '\0', fs
->blksz
);
1040 put_ext4(((uint64_t) (bgd
[ibmap_idx
].inode_id
*
1041 fs
->blksz
)), zero_buffer
,
1043 bgd
[ibmap_idx
].bg_flags
=
1044 bgd
[ibmap_idx
].bg_flags
& ~EXT4_BG_INODE_UNINIT
;
1045 memcpy(fs
->inode_bmaps
[ibmap_idx
], zero_buffer
,
1049 if (ext4fs_set_inode_bmap(fs
->curr_inode_no
,
1050 fs
->inode_bmaps
[ibmap_idx
],
1052 debug("going for restart for the block no %d %u\n",
1053 fs
->curr_inode_no
, ibmap_idx
);
1057 /* journal backup */
1058 if (prev_inode_bitmap_index
!= ibmap_idx
) {
1059 memset(journal_buffer
, '\0', fs
->blksz
);
1060 status
= ext4fs_devread((lbaint_t
)
1061 bgd
[ibmap_idx
].inode_id
1063 0, fs
->blksz
, journal_buffer
);
1066 if (ext4fs_log_journal(journal_buffer
,
1067 bgd
[ibmap_idx
].inode_id
))
1069 prev_inode_bitmap_index
= ibmap_idx
;
1071 if (bgd
[ibmap_idx
].bg_itable_unused
!=
1072 bgd
[ibmap_idx
].free_inodes
)
1073 bgd
[ibmap_idx
].bg_itable_unused
=
1074 bgd
[ibmap_idx
].free_inodes
;
1075 bgd
[ibmap_idx
].free_inodes
--;
1076 bgd
[ibmap_idx
].bg_itable_unused
--;
1077 fs
->sb
->free_inodes
--;
1082 free(journal_buffer
);
1085 return fs
->curr_inode_no
;
1087 free(journal_buffer
);
1095 static void alloc_single_indirect_block(struct ext2_inode
*file_inode
,
1096 unsigned int *total_remaining_blocks
,
1097 unsigned int *no_blks_reqd
)
1101 long int actual_block_no
;
1102 long int si_blockno
;
1103 /* si :single indirect */
1104 unsigned int *si_buffer
= NULL
;
1105 unsigned int *si_start_addr
= NULL
;
1106 struct ext_filesystem
*fs
= get_fs();
1108 if (*total_remaining_blocks
!= 0) {
1109 si_buffer
= zalloc(fs
->blksz
);
1111 printf("No Memory\n");
1114 si_start_addr
= si_buffer
;
1115 si_blockno
= ext4fs_get_new_blk_no();
1116 if (si_blockno
== -1) {
1117 printf("no block left to assign\n");
1121 debug("SIPB %ld: %u\n", si_blockno
, *total_remaining_blocks
);
1123 status
= ext4fs_devread((lbaint_t
)si_blockno
* fs
->sect_perblk
,
1124 0, fs
->blksz
, (char *)si_buffer
);
1125 memset(si_buffer
, '\0', fs
->blksz
);
1129 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1130 actual_block_no
= ext4fs_get_new_blk_no();
1131 if (actual_block_no
== -1) {
1132 printf("no block left to assign\n");
1135 *si_buffer
= actual_block_no
;
1136 debug("SIAB %u: %u\n", *si_buffer
,
1137 *total_remaining_blocks
);
1140 (*total_remaining_blocks
)--;
1141 if (*total_remaining_blocks
== 0)
1145 /* write the block to disk */
1146 put_ext4(((uint64_t) (si_blockno
* fs
->blksz
)),
1147 si_start_addr
, fs
->blksz
);
1148 file_inode
->b
.blocks
.indir_block
= si_blockno
;
1151 free(si_start_addr
);
1154 static void alloc_double_indirect_block(struct ext2_inode
*file_inode
,
1155 unsigned int *total_remaining_blocks
,
1156 unsigned int *no_blks_reqd
)
1161 long int actual_block_no
;
1162 /* di:double indirect */
1163 long int di_blockno_parent
;
1164 long int di_blockno_child
;
1165 unsigned int *di_parent_buffer
= NULL
;
1166 unsigned int *di_child_buff
= NULL
;
1167 unsigned int *di_block_start_addr
= NULL
;
1168 unsigned int *di_child_buff_start
= NULL
;
1169 struct ext_filesystem
*fs
= get_fs();
1171 if (*total_remaining_blocks
!= 0) {
1172 /* double indirect parent block connecting to inode */
1173 di_blockno_parent
= ext4fs_get_new_blk_no();
1174 if (di_blockno_parent
== -1) {
1175 printf("no block left to assign\n");
1178 di_parent_buffer
= zalloc(fs
->blksz
);
1179 if (!di_parent_buffer
)
1182 di_block_start_addr
= di_parent_buffer
;
1184 debug("DIPB %ld: %u\n", di_blockno_parent
,
1185 *total_remaining_blocks
);
1187 status
= ext4fs_devread((lbaint_t
)di_blockno_parent
*
1189 fs
->blksz
, (char *)di_parent_buffer
);
1192 printf("%s: Device read error!\n", __func__
);
1195 memset(di_parent_buffer
, '\0', fs
->blksz
);
1198 * start:for each double indirect parent
1199 * block create one more block
1201 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1202 di_blockno_child
= ext4fs_get_new_blk_no();
1203 if (di_blockno_child
== -1) {
1204 printf("no block left to assign\n");
1207 di_child_buff
= zalloc(fs
->blksz
);
1211 di_child_buff_start
= di_child_buff
;
1212 *di_parent_buffer
= di_blockno_child
;
1215 debug("DICB %ld: %u\n", di_blockno_child
,
1216 *total_remaining_blocks
);
1218 status
= ext4fs_devread((lbaint_t
)di_blockno_child
*
1221 (char *)di_child_buff
);
1224 printf("%s: Device read error!\n", __func__
);
1227 memset(di_child_buff
, '\0', fs
->blksz
);
1228 /* filling of actual datablocks for each child */
1229 for (j
= 0; j
< (fs
->blksz
/ sizeof(int)); j
++) {
1230 actual_block_no
= ext4fs_get_new_blk_no();
1231 if (actual_block_no
== -1) {
1232 printf("no block left to assign\n");
1235 *di_child_buff
= actual_block_no
;
1236 debug("DIAB %ld: %u\n", actual_block_no
,
1237 *total_remaining_blocks
);
1240 (*total_remaining_blocks
)--;
1241 if (*total_remaining_blocks
== 0)
1244 /* write the block table */
1245 put_ext4(((uint64_t) (di_blockno_child
* fs
->blksz
)),
1246 di_child_buff_start
, fs
->blksz
);
1247 free(di_child_buff_start
);
1248 di_child_buff_start
= NULL
;
1250 if (*total_remaining_blocks
== 0)
1253 put_ext4(((uint64_t) (di_blockno_parent
* fs
->blksz
)),
1254 di_block_start_addr
, fs
->blksz
);
1255 file_inode
->b
.blocks
.double_indir_block
= di_blockno_parent
;
1258 free(di_block_start_addr
);
1261 static void alloc_triple_indirect_block(struct ext2_inode
*file_inode
,
1262 unsigned int *total_remaining_blocks
,
1263 unsigned int *no_blks_reqd
)
1268 long int actual_block_no
;
1269 /* ti: Triple Indirect */
1270 long int ti_gp_blockno
;
1271 long int ti_parent_blockno
;
1272 long int ti_child_blockno
;
1273 unsigned int *ti_gp_buff
= NULL
;
1274 unsigned int *ti_parent_buff
= NULL
;
1275 unsigned int *ti_child_buff
= NULL
;
1276 unsigned int *ti_gp_buff_start_addr
= NULL
;
1277 unsigned int *ti_pbuff_start_addr
= NULL
;
1278 unsigned int *ti_cbuff_start_addr
= NULL
;
1279 struct ext_filesystem
*fs
= get_fs();
1280 if (*total_remaining_blocks
!= 0) {
1281 /* triple indirect grand parent block connecting to inode */
1282 ti_gp_blockno
= ext4fs_get_new_blk_no();
1283 if (ti_gp_blockno
== -1) {
1284 printf("no block left to assign\n");
1287 ti_gp_buff
= zalloc(fs
->blksz
);
1291 ti_gp_buff_start_addr
= ti_gp_buff
;
1293 debug("TIGPB %ld: %u\n", ti_gp_blockno
,
1294 *total_remaining_blocks
);
1296 /* for each 4 byte grand parent entry create one more block */
1297 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1298 ti_parent_blockno
= ext4fs_get_new_blk_no();
1299 if (ti_parent_blockno
== -1) {
1300 printf("no block left to assign\n");
1303 ti_parent_buff
= zalloc(fs
->blksz
);
1304 if (!ti_parent_buff
)
1307 ti_pbuff_start_addr
= ti_parent_buff
;
1308 *ti_gp_buff
= ti_parent_blockno
;
1311 debug("TIPB %ld: %u\n", ti_parent_blockno
,
1312 *total_remaining_blocks
);
1314 /* for each 4 byte entry parent create one more block */
1315 for (j
= 0; j
< (fs
->blksz
/ sizeof(int)); j
++) {
1316 ti_child_blockno
= ext4fs_get_new_blk_no();
1317 if (ti_child_blockno
== -1) {
1318 printf("no block left assign\n");
1321 ti_child_buff
= zalloc(fs
->blksz
);
1325 ti_cbuff_start_addr
= ti_child_buff
;
1326 *ti_parent_buff
= ti_child_blockno
;
1329 debug("TICB %ld: %u\n", ti_parent_blockno
,
1330 *total_remaining_blocks
);
1332 /* fill actual datablocks for each child */
1333 for (k
= 0; k
< (fs
->blksz
/ sizeof(int));
1336 ext4fs_get_new_blk_no();
1337 if (actual_block_no
== -1) {
1338 printf("no block left\n");
1341 *ti_child_buff
= actual_block_no
;
1342 debug("TIAB %ld: %u\n", actual_block_no
,
1343 *total_remaining_blocks
);
1346 (*total_remaining_blocks
)--;
1347 if (*total_remaining_blocks
== 0)
1350 /* write the child block */
1351 put_ext4(((uint64_t) (ti_child_blockno
*
1353 ti_cbuff_start_addr
, fs
->blksz
);
1354 free(ti_cbuff_start_addr
);
1356 if (*total_remaining_blocks
== 0)
1359 /* write the parent block */
1360 put_ext4(((uint64_t) (ti_parent_blockno
* fs
->blksz
)),
1361 ti_pbuff_start_addr
, fs
->blksz
);
1362 free(ti_pbuff_start_addr
);
1364 if (*total_remaining_blocks
== 0)
1367 /* write the grand parent block */
1368 put_ext4(((uint64_t) (ti_gp_blockno
* fs
->blksz
)),
1369 ti_gp_buff_start_addr
, fs
->blksz
);
1370 file_inode
->b
.blocks
.triple_indir_block
= ti_gp_blockno
;
1373 free(ti_gp_buff_start_addr
);
1376 void ext4fs_allocate_blocks(struct ext2_inode
*file_inode
,
1377 unsigned int total_remaining_blocks
,
1378 unsigned int *total_no_of_block
)
1381 long int direct_blockno
;
1382 unsigned int no_blks_reqd
= 0;
1384 /* allocation of direct blocks */
1385 for (i
= 0; i
< INDIRECT_BLOCKS
; i
++) {
1386 direct_blockno
= ext4fs_get_new_blk_no();
1387 if (direct_blockno
== -1) {
1388 printf("no block left to assign\n");
1391 file_inode
->b
.blocks
.dir_blocks
[i
] = direct_blockno
;
1392 debug("DB %ld: %u\n", direct_blockno
, total_remaining_blocks
);
1394 total_remaining_blocks
--;
1395 if (total_remaining_blocks
== 0)
1399 alloc_single_indirect_block(file_inode
, &total_remaining_blocks
,
1401 alloc_double_indirect_block(file_inode
, &total_remaining_blocks
,
1403 alloc_triple_indirect_block(file_inode
, &total_remaining_blocks
,
1405 *total_no_of_block
+= no_blks_reqd
;
1410 static struct ext4_extent_header
*ext4fs_get_extent_block
1411 (struct ext2_data
*data
, char *buf
,
1412 struct ext4_extent_header
*ext_block
,
1413 uint32_t fileblock
, int log2_blksz
)
1415 struct ext4_extent_idx
*index
;
1416 unsigned long long block
;
1417 struct ext_filesystem
*fs
= get_fs();
1421 index
= (struct ext4_extent_idx
*)(ext_block
+ 1);
1423 if (le16_to_cpu(ext_block
->eh_magic
) != EXT4_EXT_MAGIC
)
1426 if (ext_block
->eh_depth
== 0)
1431 if (i
>= le16_to_cpu(ext_block
->eh_entries
))
1433 } while (fileblock
> le32_to_cpu(index
[i
].ei_block
));
1438 block
= le16_to_cpu(index
[i
].ei_leaf_hi
);
1439 block
= (block
<< 32) + le32_to_cpu(index
[i
].ei_leaf_lo
);
1441 if (ext4fs_devread((lbaint_t
)block
<< log2_blksz
, 0, fs
->blksz
,
1443 ext_block
= (struct ext4_extent_header
*)buf
;
1449 static int ext4fs_blockgroup
1450 (struct ext2_data
*data
, int group
, struct ext2_block_group
*blkgrp
)
1453 unsigned int blkoff
, desc_per_blk
;
1454 int log2blksz
= get_fs()->dev_desc
->log2blksz
;
1456 desc_per_blk
= EXT2_BLOCK_SIZE(data
) / sizeof(struct ext2_block_group
);
1458 blkno
= __le32_to_cpu(data
->sblock
.first_data_block
) + 1 +
1459 group
/ desc_per_blk
;
1460 blkoff
= (group
% desc_per_blk
) * sizeof(struct ext2_block_group
);
1462 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1463 group
, blkno
, blkoff
);
1465 return ext4fs_devread((lbaint_t
)blkno
<<
1466 (LOG2_BLOCK_SIZE(data
) - log2blksz
),
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 log2blksz
= get_fs()->dev_desc
->log2blksz
;
1477 int inodes_per_block
, status
;
1479 unsigned int blkoff
;
1481 /* It is easier to calculate if the first inode is 0. */
1483 status
= ext4fs_blockgroup(data
, ino
/ __le32_to_cpu
1484 (sblock
->inodes_per_group
), &blkgrp
);
1488 inodes_per_block
= EXT2_BLOCK_SIZE(data
) / fs
->inodesz
;
1489 blkno
= __le32_to_cpu(blkgrp
.inode_table_id
) +
1490 (ino
% __le32_to_cpu(sblock
->inodes_per_group
)) / inodes_per_block
;
1491 blkoff
= (ino
% inodes_per_block
) * fs
->inodesz
;
1492 /* Read the inode. */
1493 status
= ext4fs_devread((lbaint_t
)blkno
<< (LOG2_BLOCK_SIZE(data
) -
1495 sizeof(struct ext2_inode
), (char *)inode
);
1502 long int read_allocated_block(struct ext2_inode
*inode
, int fileblock
)
1509 long int perblock_parent
;
1510 long int perblock_child
;
1511 unsigned long long start
;
1512 /* get the blocksize of the filesystem */
1513 blksz
= EXT2_BLOCK_SIZE(ext4fs_root
);
1514 log2_blksz
= LOG2_BLOCK_SIZE(ext4fs_root
)
1515 - get_fs()->dev_desc
->log2blksz
;
1517 if (le32_to_cpu(inode
->flags
) & EXT4_EXTENTS_FL
) {
1518 char *buf
= zalloc(blksz
);
1521 struct ext4_extent_header
*ext_block
;
1522 struct ext4_extent
*extent
;
1525 ext4fs_get_extent_block(ext4fs_root
, buf
,
1526 (struct ext4_extent_header
*)
1527 inode
->b
.blocks
.dir_blocks
,
1528 fileblock
, log2_blksz
);
1530 printf("invalid extent block\n");
1535 extent
= (struct ext4_extent
*)(ext_block
+ 1);
1539 if (i
>= le16_to_cpu(ext_block
->eh_entries
))
1541 } while (fileblock
>= le32_to_cpu(extent
[i
].ee_block
));
1543 fileblock
-= le32_to_cpu(extent
[i
].ee_block
);
1544 if (fileblock
>= le16_to_cpu(extent
[i
].ee_len
)) {
1549 start
= le16_to_cpu(extent
[i
].ee_start_hi
);
1550 start
= (start
<< 32) +
1551 le32_to_cpu(extent
[i
].ee_start_lo
);
1553 return fileblock
+ start
;
1556 printf("Extent Error\n");
1561 /* Direct blocks. */
1562 if (fileblock
< INDIRECT_BLOCKS
)
1563 blknr
= __le32_to_cpu(inode
->b
.blocks
.dir_blocks
[fileblock
]);
1566 else if (fileblock
< (INDIRECT_BLOCKS
+ (blksz
/ 4))) {
1567 if (ext4fs_indir1_block
== NULL
) {
1568 ext4fs_indir1_block
= zalloc(blksz
);
1569 if (ext4fs_indir1_block
== NULL
) {
1570 printf("** SI ext2fs read block (indir 1)"
1571 "malloc failed. **\n");
1574 ext4fs_indir1_size
= blksz
;
1575 ext4fs_indir1_blkno
= -1;
1577 if (blksz
!= ext4fs_indir1_size
) {
1578 free(ext4fs_indir1_block
);
1579 ext4fs_indir1_block
= NULL
;
1580 ext4fs_indir1_size
= 0;
1581 ext4fs_indir1_blkno
= -1;
1582 ext4fs_indir1_block
= zalloc(blksz
);
1583 if (ext4fs_indir1_block
== NULL
) {
1584 printf("** SI ext2fs read block (indir 1):"
1585 "malloc failed. **\n");
1588 ext4fs_indir1_size
= blksz
;
1590 if ((__le32_to_cpu(inode
->b
.blocks
.indir_block
) <<
1591 log2_blksz
) != ext4fs_indir1_blkno
) {
1593 ext4fs_devread((lbaint_t
)__le32_to_cpu
1595 indir_block
) << log2_blksz
, 0,
1596 blksz
, (char *)ext4fs_indir1_block
);
1598 printf("** SI ext2fs read block (indir 1)"
1602 ext4fs_indir1_blkno
=
1603 __le32_to_cpu(inode
->b
.blocks
.
1604 indir_block
) << log2_blksz
;
1606 blknr
= __le32_to_cpu(ext4fs_indir1_block
1607 [fileblock
- INDIRECT_BLOCKS
]);
1609 /* Double indirect. */
1610 else if (fileblock
< (INDIRECT_BLOCKS
+ (blksz
/ 4 *
1611 (blksz
/ 4 + 1)))) {
1613 long int perblock
= blksz
/ 4;
1614 long int rblock
= fileblock
- (INDIRECT_BLOCKS
+ blksz
/ 4);
1616 if (ext4fs_indir1_block
== NULL
) {
1617 ext4fs_indir1_block
= zalloc(blksz
);
1618 if (ext4fs_indir1_block
== NULL
) {
1619 printf("** DI ext2fs read block (indir 2 1)"
1620 "malloc failed. **\n");
1623 ext4fs_indir1_size
= blksz
;
1624 ext4fs_indir1_blkno
= -1;
1626 if (blksz
!= ext4fs_indir1_size
) {
1627 free(ext4fs_indir1_block
);
1628 ext4fs_indir1_block
= NULL
;
1629 ext4fs_indir1_size
= 0;
1630 ext4fs_indir1_blkno
= -1;
1631 ext4fs_indir1_block
= zalloc(blksz
);
1632 if (ext4fs_indir1_block
== NULL
) {
1633 printf("** DI ext2fs read block (indir 2 1)"
1634 "malloc failed. **\n");
1637 ext4fs_indir1_size
= blksz
;
1639 if ((__le32_to_cpu(inode
->b
.blocks
.double_indir_block
) <<
1640 log2_blksz
) != ext4fs_indir1_blkno
) {
1642 ext4fs_devread((lbaint_t
)__le32_to_cpu
1644 double_indir_block
) << log2_blksz
,
1646 (char *)ext4fs_indir1_block
);
1648 printf("** DI ext2fs read block (indir 2 1)"
1652 ext4fs_indir1_blkno
=
1653 __le32_to_cpu(inode
->b
.blocks
.double_indir_block
) <<
1657 if (ext4fs_indir2_block
== NULL
) {
1658 ext4fs_indir2_block
= zalloc(blksz
);
1659 if (ext4fs_indir2_block
== NULL
) {
1660 printf("** DI ext2fs read block (indir 2 2)"
1661 "malloc failed. **\n");
1664 ext4fs_indir2_size
= blksz
;
1665 ext4fs_indir2_blkno
= -1;
1667 if (blksz
!= ext4fs_indir2_size
) {
1668 free(ext4fs_indir2_block
);
1669 ext4fs_indir2_block
= NULL
;
1670 ext4fs_indir2_size
= 0;
1671 ext4fs_indir2_blkno
= -1;
1672 ext4fs_indir2_block
= zalloc(blksz
);
1673 if (ext4fs_indir2_block
== NULL
) {
1674 printf("** DI ext2fs read block (indir 2 2)"
1675 "malloc failed. **\n");
1678 ext4fs_indir2_size
= blksz
;
1680 if ((__le32_to_cpu(ext4fs_indir1_block
[rblock
/ perblock
]) <<
1681 log2_blksz
) != ext4fs_indir2_blkno
) {
1682 status
= ext4fs_devread((lbaint_t
)__le32_to_cpu
1683 (ext4fs_indir1_block
1685 perblock
]) << log2_blksz
, 0,
1687 (char *)ext4fs_indir2_block
);
1689 printf("** DI ext2fs read block (indir 2 2)"
1693 ext4fs_indir2_blkno
=
1694 __le32_to_cpu(ext4fs_indir1_block
[rblock
1699 blknr
= __le32_to_cpu(ext4fs_indir2_block
[rblock
% perblock
]);
1701 /* Tripple indirect. */
1703 rblock
= fileblock
- (INDIRECT_BLOCKS
+ blksz
/ 4 +
1704 (blksz
/ 4 * blksz
/ 4));
1705 perblock_child
= blksz
/ 4;
1706 perblock_parent
= ((blksz
/ 4) * (blksz
/ 4));
1708 if (ext4fs_indir1_block
== NULL
) {
1709 ext4fs_indir1_block
= zalloc(blksz
);
1710 if (ext4fs_indir1_block
== NULL
) {
1711 printf("** TI ext2fs read block (indir 2 1)"
1712 "malloc failed. **\n");
1715 ext4fs_indir1_size
= blksz
;
1716 ext4fs_indir1_blkno
= -1;
1718 if (blksz
!= ext4fs_indir1_size
) {
1719 free(ext4fs_indir1_block
);
1720 ext4fs_indir1_block
= NULL
;
1721 ext4fs_indir1_size
= 0;
1722 ext4fs_indir1_blkno
= -1;
1723 ext4fs_indir1_block
= zalloc(blksz
);
1724 if (ext4fs_indir1_block
== NULL
) {
1725 printf("** TI ext2fs read block (indir 2 1)"
1726 "malloc failed. **\n");
1729 ext4fs_indir1_size
= blksz
;
1731 if ((__le32_to_cpu(inode
->b
.blocks
.triple_indir_block
) <<
1732 log2_blksz
) != ext4fs_indir1_blkno
) {
1733 status
= ext4fs_devread
1735 __le32_to_cpu(inode
->b
.blocks
.triple_indir_block
)
1736 << log2_blksz
, 0, blksz
,
1737 (char *)ext4fs_indir1_block
);
1739 printf("** TI ext2fs read block (indir 2 1)"
1743 ext4fs_indir1_blkno
=
1744 __le32_to_cpu(inode
->b
.blocks
.triple_indir_block
) <<
1748 if (ext4fs_indir2_block
== NULL
) {
1749 ext4fs_indir2_block
= zalloc(blksz
);
1750 if (ext4fs_indir2_block
== NULL
) {
1751 printf("** TI ext2fs read block (indir 2 2)"
1752 "malloc failed. **\n");
1755 ext4fs_indir2_size
= blksz
;
1756 ext4fs_indir2_blkno
= -1;
1758 if (blksz
!= ext4fs_indir2_size
) {
1759 free(ext4fs_indir2_block
);
1760 ext4fs_indir2_block
= NULL
;
1761 ext4fs_indir2_size
= 0;
1762 ext4fs_indir2_blkno
= -1;
1763 ext4fs_indir2_block
= zalloc(blksz
);
1764 if (ext4fs_indir2_block
== NULL
) {
1765 printf("** TI ext2fs read block (indir 2 2)"
1766 "malloc failed. **\n");
1769 ext4fs_indir2_size
= blksz
;
1771 if ((__le32_to_cpu(ext4fs_indir1_block
[rblock
/
1772 perblock_parent
]) <<
1774 != ext4fs_indir2_blkno
) {
1775 status
= ext4fs_devread((lbaint_t
)__le32_to_cpu
1776 (ext4fs_indir1_block
1778 perblock_parent
]) <<
1779 log2_blksz
, 0, blksz
,
1780 (char *)ext4fs_indir2_block
);
1782 printf("** TI ext2fs read block (indir 2 2)"
1786 ext4fs_indir2_blkno
=
1787 __le32_to_cpu(ext4fs_indir1_block
[rblock
/
1792 if (ext4fs_indir3_block
== NULL
) {
1793 ext4fs_indir3_block
= zalloc(blksz
);
1794 if (ext4fs_indir3_block
== NULL
) {
1795 printf("** TI ext2fs read block (indir 2 2)"
1796 "malloc failed. **\n");
1799 ext4fs_indir3_size
= blksz
;
1800 ext4fs_indir3_blkno
= -1;
1802 if (blksz
!= ext4fs_indir3_size
) {
1803 free(ext4fs_indir3_block
);
1804 ext4fs_indir3_block
= NULL
;
1805 ext4fs_indir3_size
= 0;
1806 ext4fs_indir3_blkno
= -1;
1807 ext4fs_indir3_block
= zalloc(blksz
);
1808 if (ext4fs_indir3_block
== NULL
) {
1809 printf("** TI ext2fs read block (indir 2 2)"
1810 "malloc failed. **\n");
1813 ext4fs_indir3_size
= blksz
;
1815 if ((__le32_to_cpu(ext4fs_indir2_block
[rblock
1818 log2_blksz
) != ext4fs_indir3_blkno
) {
1820 ext4fs_devread((lbaint_t
)__le32_to_cpu
1821 (ext4fs_indir2_block
1822 [(rblock
/ perblock_child
)
1823 % (blksz
/ 4)]) << log2_blksz
, 0,
1824 blksz
, (char *)ext4fs_indir3_block
);
1826 printf("** TI ext2fs read block (indir 2 2)"
1830 ext4fs_indir3_blkno
=
1831 __le32_to_cpu(ext4fs_indir2_block
[(rblock
/
1838 blknr
= __le32_to_cpu(ext4fs_indir3_block
1839 [rblock
% perblock_child
]);
1841 debug("read_allocated_block %ld\n", blknr
);
1846 void ext4fs_close(void)
1848 if ((ext4fs_file
!= NULL
) && (ext4fs_root
!= NULL
)) {
1849 ext4fs_free_node(ext4fs_file
, &ext4fs_root
->diropen
);
1852 if (ext4fs_root
!= NULL
) {
1856 if (ext4fs_indir1_block
!= NULL
) {
1857 free(ext4fs_indir1_block
);
1858 ext4fs_indir1_block
= NULL
;
1859 ext4fs_indir1_size
= 0;
1860 ext4fs_indir1_blkno
= -1;
1862 if (ext4fs_indir2_block
!= NULL
) {
1863 free(ext4fs_indir2_block
);
1864 ext4fs_indir2_block
= NULL
;
1865 ext4fs_indir2_size
= 0;
1866 ext4fs_indir2_blkno
= -1;
1868 if (ext4fs_indir3_block
!= NULL
) {
1869 free(ext4fs_indir3_block
);
1870 ext4fs_indir3_block
= NULL
;
1871 ext4fs_indir3_size
= 0;
1872 ext4fs_indir3_blkno
= -1;
1876 int ext4fs_iterate_dir(struct ext2fs_node
*dir
, char *name
,
1877 struct ext2fs_node
**fnode
, int *ftype
)
1879 unsigned int fpos
= 0;
1881 struct ext2fs_node
*diro
= (struct ext2fs_node
*) dir
;
1885 printf("Iterate dir %s\n", name
);
1886 #endif /* of DEBUG */
1887 if (!diro
->inode_read
) {
1888 status
= ext4fs_read_inode(diro
->data
, diro
->ino
, &diro
->inode
);
1892 /* Search the file. */
1893 while (fpos
< __le32_to_cpu(diro
->inode
.size
)) {
1894 struct ext2_dirent dirent
;
1896 status
= ext4fs_read_file(diro
, fpos
,
1897 sizeof(struct ext2_dirent
),
1902 if (dirent
.namelen
!= 0) {
1903 char filename
[dirent
.namelen
+ 1];
1904 struct ext2fs_node
*fdiro
;
1905 int type
= FILETYPE_UNKNOWN
;
1907 status
= ext4fs_read_file(diro
,
1909 sizeof(struct ext2_dirent
),
1910 dirent
.namelen
, filename
);
1914 fdiro
= zalloc(sizeof(struct ext2fs_node
));
1918 fdiro
->data
= diro
->data
;
1919 fdiro
->ino
= __le32_to_cpu(dirent
.inode
);
1921 filename
[dirent
.namelen
] = '\0';
1923 if (dirent
.filetype
!= FILETYPE_UNKNOWN
) {
1924 fdiro
->inode_read
= 0;
1926 if (dirent
.filetype
== FILETYPE_DIRECTORY
)
1927 type
= FILETYPE_DIRECTORY
;
1928 else if (dirent
.filetype
== FILETYPE_SYMLINK
)
1929 type
= FILETYPE_SYMLINK
;
1930 else if (dirent
.filetype
== FILETYPE_REG
)
1931 type
= FILETYPE_REG
;
1933 status
= ext4fs_read_inode(diro
->data
,
1941 fdiro
->inode_read
= 1;
1943 if ((__le16_to_cpu(fdiro
->inode
.mode
) &
1944 FILETYPE_INO_MASK
) ==
1945 FILETYPE_INO_DIRECTORY
) {
1946 type
= FILETYPE_DIRECTORY
;
1947 } else if ((__le16_to_cpu(fdiro
->inode
.mode
)
1948 & FILETYPE_INO_MASK
) ==
1949 FILETYPE_INO_SYMLINK
) {
1950 type
= FILETYPE_SYMLINK
;
1951 } else if ((__le16_to_cpu(fdiro
->inode
.mode
)
1952 & FILETYPE_INO_MASK
) ==
1954 type
= FILETYPE_REG
;
1958 printf("iterate >%s<\n", filename
);
1959 #endif /* of DEBUG */
1960 if ((name
!= NULL
) && (fnode
!= NULL
)
1961 && (ftype
!= NULL
)) {
1962 if (strcmp(filename
, name
) == 0) {
1968 if (fdiro
->inode_read
== 0) {
1969 status
= ext4fs_read_inode(diro
->data
,
1977 fdiro
->inode_read
= 1;
1980 case FILETYPE_DIRECTORY
:
1983 case FILETYPE_SYMLINK
:
1994 __le32_to_cpu(fdiro
->inode
.size
),
1999 fpos
+= __le16_to_cpu(dirent
.direntlen
);
2004 static char *ext4fs_read_symlink(struct ext2fs_node
*node
)
2007 struct ext2fs_node
*diro
= node
;
2010 if (!diro
->inode_read
) {
2011 status
= ext4fs_read_inode(diro
->data
, diro
->ino
, &diro
->inode
);
2015 symlink
= zalloc(__le32_to_cpu(diro
->inode
.size
) + 1);
2019 if (__le32_to_cpu(diro
->inode
.size
) <= 60) {
2020 strncpy(symlink
, diro
->inode
.b
.symlink
,
2021 __le32_to_cpu(diro
->inode
.size
));
2023 status
= ext4fs_read_file(diro
, 0,
2024 __le32_to_cpu(diro
->inode
.size
),
2031 symlink
[__le32_to_cpu(diro
->inode
.size
)] = '\0';
2035 static int ext4fs_find_file1(const char *currpath
,
2036 struct ext2fs_node
*currroot
,
2037 struct ext2fs_node
**currfound
, int *foundtype
)
2039 char fpath
[strlen(currpath
) + 1];
2043 int type
= FILETYPE_DIRECTORY
;
2044 struct ext2fs_node
*currnode
= currroot
;
2045 struct ext2fs_node
*oldnode
= currroot
;
2047 strncpy(fpath
, currpath
, strlen(currpath
) + 1);
2049 /* Remove all leading slashes. */
2050 while (*name
== '/')
2054 *currfound
= currnode
;
2061 /* Extract the actual part from the pathname. */
2062 next
= strchr(name
, '/');
2064 /* Remove all leading slashes. */
2065 while (*next
== '/')
2069 if (type
!= FILETYPE_DIRECTORY
) {
2070 ext4fs_free_node(currnode
, currroot
);
2076 /* Iterate over the directory. */
2077 found
= ext4fs_iterate_dir(currnode
, name
, &currnode
, &type
);
2084 /* Read in the symlink and follow it. */
2085 if (type
== FILETYPE_SYMLINK
) {
2088 /* Test if the symlink does not loop. */
2089 if (++symlinknest
== 8) {
2090 ext4fs_free_node(currnode
, currroot
);
2091 ext4fs_free_node(oldnode
, currroot
);
2095 symlink
= ext4fs_read_symlink(currnode
);
2096 ext4fs_free_node(currnode
, currroot
);
2099 ext4fs_free_node(oldnode
, currroot
);
2103 debug("Got symlink >%s<\n", symlink
);
2105 if (symlink
[0] == '/') {
2106 ext4fs_free_node(oldnode
, currroot
);
2107 oldnode
= &ext4fs_root
->diropen
;
2110 /* Lookup the node the symlink points to. */
2111 status
= ext4fs_find_file1(symlink
, oldnode
,
2117 ext4fs_free_node(oldnode
, currroot
);
2122 ext4fs_free_node(oldnode
, currroot
);
2124 /* Found the node! */
2125 if (!next
|| *next
== '\0') {
2126 *currfound
= currnode
;
2135 int ext4fs_find_file(const char *path
, struct ext2fs_node
*rootnode
,
2136 struct ext2fs_node
**foundnode
, int expecttype
)
2139 int foundtype
= FILETYPE_DIRECTORY
;
2145 status
= ext4fs_find_file1(path
, rootnode
, foundnode
, &foundtype
);
2149 /* Check if the node that was found was of the expected type. */
2150 if ((expecttype
== FILETYPE_REG
) && (foundtype
!= expecttype
))
2152 else if ((expecttype
== FILETYPE_DIRECTORY
)
2153 && (foundtype
!= expecttype
))
2159 int ext4fs_open(const char *filename
)
2161 struct ext2fs_node
*fdiro
= NULL
;
2165 if (ext4fs_root
== NULL
)
2169 status
= ext4fs_find_file(filename
, &ext4fs_root
->diropen
, &fdiro
,
2174 if (!fdiro
->inode_read
) {
2175 status
= ext4fs_read_inode(fdiro
->data
, fdiro
->ino
,
2180 len
= __le32_to_cpu(fdiro
->inode
.size
);
2181 ext4fs_file
= fdiro
;
2185 ext4fs_free_node(fdiro
, &ext4fs_root
->diropen
);
2190 int ext4fs_mount(unsigned part_length
)
2192 struct ext2_data
*data
;
2194 struct ext_filesystem
*fs
= get_fs();
2195 data
= zalloc(SUPERBLOCK_SIZE
);
2199 /* Read the superblock. */
2200 status
= ext4_read_superblock((char *)&data
->sblock
);
2205 /* Make sure this is an ext2 filesystem. */
2206 if (__le16_to_cpu(data
->sblock
.magic
) != EXT2_MAGIC
)
2209 if (__le32_to_cpu(data
->sblock
.revision_level
== 0))
2212 fs
->inodesz
= __le16_to_cpu(data
->sblock
.inode_size
);
2214 debug("EXT2 rev %d, inode_size %d\n",
2215 __le32_to_cpu(data
->sblock
.revision_level
), fs
->inodesz
);
2217 data
->diropen
.data
= data
;
2218 data
->diropen
.ino
= 2;
2219 data
->diropen
.inode_read
= 1;
2220 data
->inode
= &data
->diropen
.inode
;
2222 status
= ext4fs_read_inode(data
, 2, data
->inode
);
2230 printf("Failed to mount ext2 filesystem...\n");