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 __le32
*ext4fs_indir1_block
;
37 int ext4fs_indir1_size
;
38 int ext4fs_indir1_blkno
= -1;
39 __le32
*ext4fs_indir2_block
;
40 int ext4fs_indir2_size
;
41 int ext4fs_indir2_blkno
= -1;
43 __le32
*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 struct ext2_block_group
*ext4fs_get_group_descriptor
51 (const struct ext_filesystem
*fs
, uint32_t bg_idx
)
53 return (struct ext2_block_group
*)(fs
->gdtable
+ (bg_idx
* fs
->gdsize
));
56 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock
*sb
)
58 sb
->free_inodes
= cpu_to_le32(le32_to_cpu(sb
->free_inodes
) - 1);
61 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock
*sb
)
63 uint64_t free_blocks
= le32_to_cpu(sb
->free_blocks
);
64 free_blocks
+= (uint64_t)le32_to_cpu(sb
->free_blocks_high
) << 32;
67 sb
->free_blocks
= cpu_to_le32(free_blocks
& 0xffffffff);
68 sb
->free_blocks_high
= cpu_to_le16(free_blocks
>> 32);
71 static inline void ext4fs_bg_free_inodes_dec
72 (struct ext2_block_group
*bg
, const struct ext_filesystem
*fs
)
74 uint32_t free_inodes
= le16_to_cpu(bg
->free_inodes
);
76 free_inodes
+= le16_to_cpu(bg
->free_inodes_high
) << 16;
79 bg
->free_inodes
= cpu_to_le16(free_inodes
& 0xffff);
81 bg
->free_inodes_high
= cpu_to_le16(free_inodes
>> 16);
84 static inline void ext4fs_bg_free_blocks_dec
85 (struct ext2_block_group
*bg
, const struct ext_filesystem
*fs
)
87 uint32_t free_blocks
= le16_to_cpu(bg
->free_blocks
);
89 free_blocks
+= le16_to_cpu(bg
->free_blocks_high
) << 16;
92 bg
->free_blocks
= cpu_to_le16(free_blocks
& 0xffff);
94 bg
->free_blocks_high
= cpu_to_le16(free_blocks
>> 16);
97 static inline void ext4fs_bg_itable_unused_dec
98 (struct ext2_block_group
*bg
, const struct ext_filesystem
*fs
)
100 uint32_t free_inodes
= le16_to_cpu(bg
->bg_itable_unused
);
101 if (fs
->gdsize
== 64)
102 free_inodes
+= le16_to_cpu(bg
->bg_itable_unused_high
) << 16;
105 bg
->bg_itable_unused
= cpu_to_le16(free_inodes
& 0xffff);
106 if (fs
->gdsize
== 64)
107 bg
->bg_itable_unused_high
= cpu_to_le16(free_inodes
>> 16);
110 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock
*sb
)
112 uint64_t free_blocks
= le32_to_cpu(sb
->free_blocks
);
113 free_blocks
+= (uint64_t)le32_to_cpu(sb
->free_blocks_high
) << 32;
117 void ext4fs_sb_set_free_blocks(struct ext2_sblock
*sb
, uint64_t free_blocks
)
119 sb
->free_blocks
= cpu_to_le32(free_blocks
& 0xffffffff);
120 sb
->free_blocks_high
= cpu_to_le16(free_blocks
>> 32);
123 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group
*bg
,
124 const struct ext_filesystem
*fs
)
126 uint32_t free_blocks
= le16_to_cpu(bg
->free_blocks
);
127 if (fs
->gdsize
== 64)
128 free_blocks
+= le16_to_cpu(bg
->free_blocks_high
) << 16;
133 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group
*bg
,
134 const struct ext_filesystem
*fs
)
136 uint32_t free_inodes
= le16_to_cpu(bg
->free_inodes
);
137 if (fs
->gdsize
== 64)
138 free_inodes
+= le16_to_cpu(bg
->free_inodes_high
) << 16;
142 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group
*bg
)
144 return le16_to_cpu(bg
->bg_flags
);
147 static inline void ext4fs_bg_set_flags(struct ext2_block_group
*bg
,
150 bg
->bg_flags
= cpu_to_le16(flags
);
153 /* Block number of the block bitmap */
154 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group
*bg
,
155 const struct ext_filesystem
*fs
)
157 uint64_t block_nr
= le32_to_cpu(bg
->block_id
);
158 if (fs
->gdsize
== 64)
159 block_nr
+= (uint64_t)le32_to_cpu(bg
->block_id_high
) << 32;
163 /* Block number of the inode bitmap */
164 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group
*bg
,
165 const struct ext_filesystem
*fs
)
167 uint64_t block_nr
= le32_to_cpu(bg
->inode_id
);
168 if (fs
->gdsize
== 64)
169 block_nr
+= (uint64_t)le32_to_cpu(bg
->inode_id_high
) << 32;
174 /* Block number of the inode table */
175 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group
*bg
,
176 const struct ext_filesystem
*fs
)
178 uint64_t block_nr
= le32_to_cpu(bg
->inode_table_id
);
179 if (fs
->gdsize
== 64)
181 (uint64_t)le32_to_cpu(bg
->inode_table_id_high
) << 32;
185 #if defined(CONFIG_EXT4_WRITE)
186 uint32_t ext4fs_div_roundup(uint32_t size
, uint32_t n
)
188 uint32_t res
= size
/ n
;
195 void put_ext4(uint64_t off
, void *buf
, uint32_t size
)
199 unsigned char *temp_ptr
= NULL
;
200 struct ext_filesystem
*fs
= get_fs();
201 int log2blksz
= fs
->dev_desc
->log2blksz
;
202 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf
, fs
->dev_desc
->blksz
);
204 startblock
= off
>> log2blksz
;
205 startblock
+= part_offset
;
206 remainder
= off
& (uint64_t)(fs
->dev_desc
->blksz
- 1);
208 if (fs
->dev_desc
== NULL
)
211 if ((startblock
+ (size
>> log2blksz
)) >
212 (part_offset
+ fs
->total_sect
)) {
213 printf("part_offset is " LBAFU
"\n", part_offset
);
214 printf("total_sector is %" PRIu64
"\n", fs
->total_sect
);
215 printf("error: overflow occurs\n");
220 blk_dread(fs
->dev_desc
, startblock
, 1, sec_buf
);
222 memcpy((temp_ptr
+ remainder
), (unsigned char *)buf
, size
);
223 blk_dwrite(fs
->dev_desc
, startblock
, 1, sec_buf
);
225 if (size
>> log2blksz
!= 0) {
226 blk_dwrite(fs
->dev_desc
, startblock
, size
>> log2blksz
,
227 (unsigned long *)buf
);
229 blk_dread(fs
->dev_desc
, startblock
, 1, sec_buf
);
231 memcpy(temp_ptr
, buf
, size
);
232 blk_dwrite(fs
->dev_desc
, startblock
, 1,
233 (unsigned long *)sec_buf
);
238 static int _get_new_inode_no(unsigned char *buffer
)
240 struct ext_filesystem
*fs
= get_fs();
246 /* get the blocksize of the filesystem */
247 unsigned char *ptr
= buffer
;
248 while (*ptr
== 255) {
251 if (count
> le32_to_cpu(ext4fs_root
->sblock
.inodes_per_group
))
255 for (j
= 0; j
< fs
->blksz
; j
++) {
260 status
= input
& operand
;
275 static int _get_new_blk_no(unsigned char *buffer
)
280 unsigned char *ptr
= buffer
;
281 struct ext_filesystem
*fs
= get_fs();
283 while (*ptr
== 255) {
286 if (count
== (fs
->blksz
* 8))
290 if (fs
->blksz
== 1024)
293 for (i
= 0; i
<= 7; i
++) {
295 if (*ptr
& operand
) {
306 int ext4fs_set_block_bmap(long int blockno
, unsigned char *buffer
, int index
)
308 int i
, remainder
, status
;
309 unsigned char *ptr
= buffer
;
310 unsigned char operand
;
312 remainder
= blockno
% 8;
313 int blocksize
= EXT2_BLOCK_SIZE(ext4fs_root
);
315 i
= i
- (index
* blocksize
);
316 if (blocksize
!= 1024) {
318 operand
= 1 << remainder
;
319 status
= *ptr
& operand
;
323 *ptr
= *ptr
| operand
;
326 if (remainder
== 0) {
331 operand
= (1 << (remainder
- 1));
333 status
= *ptr
& operand
;
337 *ptr
= *ptr
| operand
;
342 void ext4fs_reset_block_bmap(long int blockno
, unsigned char *buffer
, int index
)
344 int i
, remainder
, status
;
345 unsigned char *ptr
= buffer
;
346 unsigned char operand
;
348 remainder
= blockno
% 8;
349 int blocksize
= EXT2_BLOCK_SIZE(ext4fs_root
);
351 i
= i
- (index
* blocksize
);
352 if (blocksize
!= 1024) {
354 operand
= (1 << remainder
);
355 status
= *ptr
& operand
;
357 *ptr
= *ptr
& ~(operand
);
359 if (remainder
== 0) {
364 operand
= (1 << (remainder
- 1));
366 status
= *ptr
& operand
;
368 *ptr
= *ptr
& ~(operand
);
372 int ext4fs_set_inode_bmap(int inode_no
, unsigned char *buffer
, int index
)
374 int i
, remainder
, status
;
375 unsigned char *ptr
= buffer
;
376 unsigned char operand
;
378 inode_no
-= (index
* le32_to_cpu(ext4fs_root
->sblock
.inodes_per_group
));
380 remainder
= inode_no
% 8;
381 if (remainder
== 0) {
386 operand
= (1 << (remainder
- 1));
388 status
= *ptr
& operand
;
392 *ptr
= *ptr
| operand
;
397 void ext4fs_reset_inode_bmap(int inode_no
, unsigned char *buffer
, int index
)
399 int i
, remainder
, status
;
400 unsigned char *ptr
= buffer
;
401 unsigned char operand
;
403 inode_no
-= (index
* le32_to_cpu(ext4fs_root
->sblock
.inodes_per_group
));
405 remainder
= inode_no
% 8;
406 if (remainder
== 0) {
411 operand
= (1 << (remainder
- 1));
413 status
= *ptr
& operand
;
415 *ptr
= *ptr
& ~(operand
);
418 uint16_t ext4fs_checksum_update(uint32_t i
)
420 struct ext2_block_group
*desc
;
421 struct ext_filesystem
*fs
= get_fs();
423 __le32 le32_i
= cpu_to_le32(i
);
425 desc
= ext4fs_get_group_descriptor(fs
, i
);
426 if (le32_to_cpu(fs
->sb
->feature_ro_compat
) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM
) {
427 int offset
= offsetof(struct ext2_block_group
, bg_checksum
);
429 crc
= ext2fs_crc16(~0, fs
->sb
->unique_id
,
430 sizeof(fs
->sb
->unique_id
));
431 crc
= ext2fs_crc16(crc
, &le32_i
, sizeof(le32_i
));
432 crc
= ext2fs_crc16(crc
, desc
, offset
);
433 offset
+= sizeof(desc
->bg_checksum
); /* skip checksum */
434 assert(offset
== sizeof(*desc
));
440 static int check_void_in_dentry(struct ext2_dirent
*dir
, char *filename
)
443 int sizeof_void_space
;
444 int new_entry_byte_reqd
;
445 short padding_factor
= 0;
447 if (dir
->namelen
% 4 != 0)
448 padding_factor
= 4 - (dir
->namelen
% 4);
450 dentry_length
= sizeof(struct ext2_dirent
) +
451 dir
->namelen
+ padding_factor
;
452 sizeof_void_space
= le16_to_cpu(dir
->direntlen
) - dentry_length
;
453 if (sizeof_void_space
== 0)
457 if (strlen(filename
) % 4 != 0)
458 padding_factor
= 4 - (strlen(filename
) % 4);
460 new_entry_byte_reqd
= strlen(filename
) +
461 sizeof(struct ext2_dirent
) + padding_factor
;
462 if (sizeof_void_space
>= new_entry_byte_reqd
) {
463 dir
->direntlen
= cpu_to_le16(dentry_length
);
464 return sizeof_void_space
;
470 int ext4fs_update_parent_dentry(char *filename
, int file_type
)
472 unsigned int *zero_buffer
= NULL
;
473 char *root_first_block_buffer
= NULL
;
475 long int first_block_no_of_root
= 0;
477 unsigned int new_entry_byte_reqd
;
478 int sizeof_void_space
= 0;
482 struct ext_filesystem
*fs
= get_fs();
483 /* directory entry */
484 struct ext2_dirent
*dir
;
485 char *temp_dir
= NULL
;
488 uint32_t new_blockcnt
;
489 uint32_t directory_blocks
;
491 zero_buffer
= zalloc(fs
->blksz
);
493 printf("No Memory\n");
496 root_first_block_buffer
= zalloc(fs
->blksz
);
497 if (!root_first_block_buffer
) {
499 printf("No Memory\n");
502 new_entry_byte_reqd
= ROUND(strlen(filename
) +
503 sizeof(struct ext2_dirent
), 4);
505 directory_blocks
= le32_to_cpu(g_parent_inode
->size
) >>
506 LOG2_BLOCK_SIZE(ext4fs_root
);
507 blk_idx
= directory_blocks
- 1;
510 /* read the block no allocated to a file */
511 first_block_no_of_root
= read_allocated_block(g_parent_inode
, blk_idx
);
512 if (first_block_no_of_root
<= 0)
515 status
= ext4fs_devread((lbaint_t
)first_block_no_of_root
517 0, fs
->blksz
, root_first_block_buffer
);
521 if (ext4fs_log_journal(root_first_block_buffer
, first_block_no_of_root
))
523 dir
= (struct ext2_dirent
*)root_first_block_buffer
;
526 while (le16_to_cpu(dir
->direntlen
) > 0) {
527 unsigned short used_len
= ROUND(dir
->namelen
+
528 sizeof(struct ext2_dirent
), 4);
530 /* last entry of block */
531 if (fs
->blksz
- totalbytes
== le16_to_cpu(dir
->direntlen
)) {
533 /* check if new entry fits */
534 if ((used_len
+ new_entry_byte_reqd
) <=
535 le16_to_cpu(dir
->direntlen
)) {
536 dir
->direntlen
= cpu_to_le16(used_len
);
540 printf("Block full, trying previous\n");
544 printf("All blocks full: Allocate new\n");
546 if (le32_to_cpu(g_parent_inode
->flags
) &
548 printf("Directory uses extents\n");
551 if (directory_blocks
>= INDIRECT_BLOCKS
) {
552 printf("Directory exceeds limit\n");
555 new_blk_no
= ext4fs_get_new_blk_no();
556 if (new_blk_no
== -1) {
557 printf("no block left to assign\n");
560 put_ext4((uint64_t)new_blk_no
* fs
->blksz
, zero_buffer
, fs
->blksz
);
561 g_parent_inode
->b
.blocks
.
562 dir_blocks
[directory_blocks
] =
563 cpu_to_le32(new_blk_no
);
565 new_size
= le32_to_cpu(g_parent_inode
->size
);
566 new_size
+= fs
->blksz
;
567 g_parent_inode
->size
= cpu_to_le32(new_size
);
569 new_blockcnt
= le32_to_cpu(g_parent_inode
->blockcnt
);
570 new_blockcnt
+= fs
->sect_perblk
;
571 g_parent_inode
->blockcnt
= cpu_to_le32(new_blockcnt
);
573 if (ext4fs_put_metadata
574 (root_first_block_buffer
,
575 first_block_no_of_root
))
581 templength
= le16_to_cpu(dir
->direntlen
);
582 totalbytes
= totalbytes
+ templength
;
583 sizeof_void_space
= check_void_in_dentry(dir
, filename
);
584 if (sizeof_void_space
)
587 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
590 /* make a pointer ready for creating next directory entry */
591 templength
= le16_to_cpu(dir
->direntlen
);
592 totalbytes
= totalbytes
+ templength
;
593 dir
= (struct ext2_dirent
*)((char *)dir
+ templength
);
595 /* get the next available inode number */
596 inodeno
= ext4fs_get_new_inode_no();
598 printf("no inode left to assign\n");
601 dir
->inode
= cpu_to_le32(inodeno
);
602 if (sizeof_void_space
)
603 dir
->direntlen
= cpu_to_le16(sizeof_void_space
);
605 dir
->direntlen
= cpu_to_le16(fs
->blksz
- totalbytes
);
607 dir
->namelen
= strlen(filename
);
608 dir
->filetype
= FILETYPE_REG
; /* regular file */
609 temp_dir
= (char *)dir
;
610 temp_dir
= temp_dir
+ sizeof(struct ext2_dirent
);
611 memcpy(temp_dir
, filename
, strlen(filename
));
613 /* update or write the 1st block of root inode */
614 if (ext4fs_put_metadata(root_first_block_buffer
,
615 first_block_no_of_root
))
620 free(root_first_block_buffer
);
625 static int search_dir(struct ext2_inode
*parent_inode
, char *dirname
)
632 char *block_buffer
= NULL
;
633 struct ext2_dirent
*dir
= NULL
;
634 struct ext_filesystem
*fs
= get_fs();
635 uint32_t directory_blocks
;
638 directory_blocks
= le32_to_cpu(parent_inode
->size
) >>
639 LOG2_BLOCK_SIZE(ext4fs_root
);
641 block_buffer
= zalloc(fs
->blksz
);
645 /* get the block no allocated to a file */
646 for (blk_idx
= 0; blk_idx
< directory_blocks
; blk_idx
++) {
647 blknr
= read_allocated_block(parent_inode
, blk_idx
);
651 /* read the directory block */
652 status
= ext4fs_devread((lbaint_t
)blknr
* fs
->sect_perblk
,
653 0, fs
->blksz
, (char *)block_buffer
);
659 dir
= (struct ext2_dirent
*)(block_buffer
+ offset
);
660 direntname
= (char*)(dir
) + sizeof(struct ext2_dirent
);
662 int direntlen
= le16_to_cpu(dir
->direntlen
);
663 if (direntlen
< sizeof(struct ext2_dirent
))
666 if (dir
->inode
&& (strlen(dirname
) == dir
->namelen
) &&
667 (strncmp(dirname
, direntname
, dir
->namelen
) == 0)) {
668 inodeno
= le32_to_cpu(dir
->inode
);
674 } while (offset
< fs
->blksz
);
688 static int find_dir_depth(char *dirname
)
690 char *token
= strtok(dirname
, "/");
692 while (token
!= NULL
) {
693 token
= strtok(NULL
, "/");
696 return count
+ 1 + 1;
698 * for example for string /home/temp
699 * depth=home(1)+temp(1)+1 extra for NULL;
704 static int parse_path(char **arr
, char *dirname
)
706 char *token
= strtok(dirname
, "/");
710 arr
[i
] = zalloc(strlen("/") + 1);
713 memcpy(arr
[i
++], "/", strlen("/"));
715 /* add each path entry after root */
716 while (token
!= NULL
) {
717 arr
[i
] = zalloc(strlen(token
) + 1);
720 memcpy(arr
[i
++], token
, strlen(token
));
721 token
= strtok(NULL
, "/");
728 int ext4fs_iget(int inode_no
, struct ext2_inode
*inode
)
730 if (ext4fs_read_inode(ext4fs_root
, inode_no
, inode
) == 0)
737 * Function: ext4fs_get_parent_inode_num
738 * Return Value: inode Number of the parent directory of file/Directory to be
740 * dirname : Input parmater, input path name of the file/directory to be created
741 * dname : Output parameter, to be filled with the name of the directory
742 * extracted from dirname
744 int ext4fs_get_parent_inode_num(const char *dirname
, char *dname
, int flags
)
748 int matched_inode_no
;
749 int result_inode_no
= -1;
751 char *depth_dirname
= NULL
;
752 char *parse_dirname
= NULL
;
753 struct ext2_inode
*parent_inode
= NULL
;
754 struct ext2_inode
*first_inode
= NULL
;
755 struct ext2_inode temp_inode
;
757 if (*dirname
!= '/') {
758 printf("Please supply Absolute path\n");
762 /* TODO: input validation make equivalent to linux */
763 depth_dirname
= zalloc(strlen(dirname
) + 1);
767 memcpy(depth_dirname
, dirname
, strlen(dirname
));
768 depth
= find_dir_depth(depth_dirname
);
769 parse_dirname
= zalloc(strlen(dirname
) + 1);
772 memcpy(parse_dirname
, dirname
, strlen(dirname
));
774 /* allocate memory for each directory level */
775 ptr
= zalloc((depth
) * sizeof(char *));
778 if (parse_path(ptr
, parse_dirname
))
780 parent_inode
= zalloc(sizeof(struct ext2_inode
));
783 first_inode
= zalloc(sizeof(struct ext2_inode
));
786 memcpy(parent_inode
, ext4fs_root
->inode
, sizeof(struct ext2_inode
));
787 memcpy(first_inode
, parent_inode
, sizeof(struct ext2_inode
));
789 result_inode_no
= EXT2_ROOT_INO
;
790 for (i
= 1; i
< depth
; i
++) {
791 matched_inode_no
= search_dir(parent_inode
, ptr
[i
]);
792 if (matched_inode_no
== -1) {
793 if (ptr
[i
+ 1] == NULL
&& i
== 1) {
794 result_inode_no
= EXT2_ROOT_INO
;
797 if (ptr
[i
+ 1] == NULL
)
799 printf("Invalid path\n");
800 result_inode_no
= -1;
804 if (ptr
[i
+ 1] != NULL
) {
805 memset(parent_inode
, '\0',
806 sizeof(struct ext2_inode
));
807 if (ext4fs_iget(matched_inode_no
,
809 result_inode_no
= -1;
812 result_inode_no
= matched_inode_no
;
821 matched_inode_no
= search_dir(first_inode
, ptr
[i
]);
823 matched_inode_no
= search_dir(parent_inode
, ptr
[i
]);
825 if (matched_inode_no
!= -1) {
826 ext4fs_iget(matched_inode_no
, &temp_inode
);
827 if (le16_to_cpu(temp_inode
.mode
) & S_IFDIR
) {
828 printf("It is a Directory\n");
829 result_inode_no
= -1;
834 if (strlen(ptr
[i
]) > 256) {
835 result_inode_no
= -1;
838 memcpy(dname
, ptr
[i
], strlen(ptr
[i
]));
843 for (i
= 0; i
< depth
; i
++) {
852 return result_inode_no
;
855 static int unlink_filename(char *filename
, unsigned int blknr
)
860 char *block_buffer
= NULL
;
861 struct ext2_dirent
*dir
= NULL
;
862 struct ext2_dirent
*previous_dir
;
863 struct ext_filesystem
*fs
= get_fs();
867 block_buffer
= zalloc(fs
->blksz
);
871 /* read the directory block */
872 status
= ext4fs_devread((lbaint_t
)blknr
* fs
->sect_perblk
, 0,
873 fs
->blksz
, block_buffer
);
880 dir
= (struct ext2_dirent
*)(block_buffer
+ offset
);
881 direntname
= (char *)(dir
) + sizeof(struct ext2_dirent
);
883 int direntlen
= le16_to_cpu(dir
->direntlen
);
884 if (direntlen
< sizeof(struct ext2_dirent
))
887 if (dir
->inode
&& (strlen(filename
) == dir
->namelen
) &&
888 (strncmp(direntname
, filename
, dir
->namelen
) == 0)) {
889 inodeno
= le32_to_cpu(dir
->inode
);
895 } while (offset
< fs
->blksz
);
898 printf("file found, deleting\n");
899 if (ext4fs_log_journal(block_buffer
, blknr
))
903 /* merge dir entry with predecessor */
905 new_len
= le16_to_cpu(previous_dir
->direntlen
);
906 new_len
+= le16_to_cpu(dir
->direntlen
);
907 previous_dir
->direntlen
= cpu_to_le16(new_len
);
909 /* invalidate dir entry */
912 if (ext4fs_put_metadata(block_buffer
, blknr
))
922 int ext4fs_filename_unlink(char *filename
)
927 uint32_t directory_blocks
;
929 directory_blocks
= le32_to_cpu(g_parent_inode
->size
) >>
930 LOG2_BLOCK_SIZE(ext4fs_root
);
932 /* read the block no allocated to a file */
933 for (blk_idx
= 0; blk_idx
< directory_blocks
; blk_idx
++) {
934 blknr
= read_allocated_block(g_parent_inode
, blk_idx
);
937 inodeno
= unlink_filename(filename
, blknr
);
945 uint32_t ext4fs_get_new_blk_no(void)
951 static int prev_bg_bitmap_index
= -1;
952 unsigned int blk_per_grp
= le32_to_cpu(ext4fs_root
->sblock
.blocks_per_group
);
953 struct ext_filesystem
*fs
= get_fs();
954 char *journal_buffer
= zalloc(fs
->blksz
);
955 char *zero_buffer
= zalloc(fs
->blksz
);
956 if (!journal_buffer
|| !zero_buffer
)
959 if (fs
->first_pass_bbmap
== 0) {
960 for (i
= 0; i
< fs
->no_blkgrp
; i
++) {
961 struct ext2_block_group
*bgd
= NULL
;
962 bgd
= ext4fs_get_group_descriptor(fs
, i
);
963 if (ext4fs_bg_get_free_blocks(bgd
, fs
)) {
964 uint16_t bg_flags
= ext4fs_bg_get_flags(bgd
);
965 uint64_t b_bitmap_blk
=
966 ext4fs_bg_get_block_id(bgd
, fs
);
967 if (bg_flags
& EXT4_BG_BLOCK_UNINIT
) {
968 memcpy(fs
->blk_bmaps
[i
], zero_buffer
,
970 put_ext4(b_bitmap_blk
* fs
->blksz
,
971 fs
->blk_bmaps
[i
], fs
->blksz
);
972 bg_flags
&= ~EXT4_BG_BLOCK_UNINIT
;
973 ext4fs_bg_set_flags(bgd
, bg_flags
);
976 _get_new_blk_no(fs
->blk_bmaps
[i
]);
977 if (fs
->curr_blkno
== -1)
978 /* block bitmap is completely filled */
980 fs
->curr_blkno
= fs
->curr_blkno
+
982 fs
->first_pass_bbmap
++;
983 ext4fs_bg_free_blocks_dec(bgd
, fs
);
984 ext4fs_sb_free_blocks_dec(fs
->sb
);
985 status
= ext4fs_devread(b_bitmap_blk
*
991 if (ext4fs_log_journal(journal_buffer
,
996 debug("no space left on block group %d\n", i
);
1004 /* get the blockbitmap index respective to blockno */
1005 bg_idx
= fs
->curr_blkno
/ blk_per_grp
;
1006 if (fs
->blksz
== 1024) {
1007 remainder
= fs
->curr_blkno
% blk_per_grp
;
1013 * To skip completely filled block group bitmaps
1014 * Optimize the block allocation
1016 if (bg_idx
>= fs
->no_blkgrp
)
1019 struct ext2_block_group
*bgd
= NULL
;
1020 bgd
= ext4fs_get_group_descriptor(fs
, bg_idx
);
1021 if (ext4fs_bg_get_free_blocks(bgd
, fs
) == 0) {
1022 debug("block group %u is full. Skipping\n", bg_idx
);
1023 fs
->curr_blkno
= (bg_idx
+ 1) * blk_per_grp
;
1024 if (fs
->blksz
== 1024)
1025 fs
->curr_blkno
+= 1;
1029 uint16_t bg_flags
= ext4fs_bg_get_flags(bgd
);
1030 uint64_t b_bitmap_blk
= ext4fs_bg_get_block_id(bgd
, fs
);
1031 if (bg_flags
& EXT4_BG_BLOCK_UNINIT
) {
1032 memcpy(fs
->blk_bmaps
[bg_idx
], zero_buffer
, fs
->blksz
);
1033 put_ext4(b_bitmap_blk
* fs
->blksz
,
1034 zero_buffer
, fs
->blksz
);
1035 bg_flags
&= ~EXT4_BG_BLOCK_UNINIT
;
1036 ext4fs_bg_set_flags(bgd
, bg_flags
);
1039 if (ext4fs_set_block_bmap(fs
->curr_blkno
, fs
->blk_bmaps
[bg_idx
],
1041 debug("going for restart for the block no %ld %u\n",
1042 fs
->curr_blkno
, bg_idx
);
1047 /* journal backup */
1048 if (prev_bg_bitmap_index
!= bg_idx
) {
1049 status
= ext4fs_devread(b_bitmap_blk
* fs
->sect_perblk
,
1050 0, fs
->blksz
, journal_buffer
);
1053 if (ext4fs_log_journal(journal_buffer
, b_bitmap_blk
))
1056 prev_bg_bitmap_index
= bg_idx
;
1058 ext4fs_bg_free_blocks_dec(bgd
, fs
);
1059 ext4fs_sb_free_blocks_dec(fs
->sb
);
1063 free(journal_buffer
);
1066 return fs
->curr_blkno
;
1068 free(journal_buffer
);
1074 int ext4fs_get_new_inode_no(void)
1078 unsigned int ibmap_idx
;
1079 static int prev_inode_bitmap_index
= -1;
1080 unsigned int inodes_per_grp
= le32_to_cpu(ext4fs_root
->sblock
.inodes_per_group
);
1081 struct ext_filesystem
*fs
= get_fs();
1082 char *journal_buffer
= zalloc(fs
->blksz
);
1083 char *zero_buffer
= zalloc(fs
->blksz
);
1084 if (!journal_buffer
|| !zero_buffer
)
1086 int has_gdt_chksum
= le32_to_cpu(fs
->sb
->feature_ro_compat
) &
1087 EXT4_FEATURE_RO_COMPAT_GDT_CSUM
? 1 : 0;
1089 if (fs
->first_pass_ibmap
== 0) {
1090 for (i
= 0; i
< fs
->no_blkgrp
; i
++) {
1091 uint32_t free_inodes
;
1092 struct ext2_block_group
*bgd
= NULL
;
1093 bgd
= ext4fs_get_group_descriptor(fs
, i
);
1094 free_inodes
= ext4fs_bg_get_free_inodes(bgd
, fs
);
1096 uint16_t bg_flags
= ext4fs_bg_get_flags(bgd
);
1097 uint64_t i_bitmap_blk
=
1098 ext4fs_bg_get_inode_id(bgd
, fs
);
1100 bgd
->bg_itable_unused
= free_inodes
;
1101 if (bg_flags
& EXT4_BG_INODE_UNINIT
) {
1102 put_ext4(i_bitmap_blk
* fs
->blksz
,
1103 zero_buffer
, fs
->blksz
);
1104 bg_flags
&= ~EXT4_BG_INODE_UNINIT
;
1105 ext4fs_bg_set_flags(bgd
, bg_flags
);
1106 memcpy(fs
->inode_bmaps
[i
],
1107 zero_buffer
, fs
->blksz
);
1110 _get_new_inode_no(fs
->inode_bmaps
[i
]);
1111 if (fs
->curr_inode_no
== -1)
1112 /* inode bitmap is completely filled */
1114 fs
->curr_inode_no
= fs
->curr_inode_no
+
1115 (i
* inodes_per_grp
);
1116 fs
->first_pass_ibmap
++;
1117 ext4fs_bg_free_inodes_dec(bgd
, fs
);
1119 ext4fs_bg_itable_unused_dec(bgd
, fs
);
1120 ext4fs_sb_free_inodes_dec(fs
->sb
);
1121 status
= ext4fs_devread(i_bitmap_blk
*
1127 if (ext4fs_log_journal(journal_buffer
,
1132 debug("no inode left on block group %d\n", i
);
1137 fs
->curr_inode_no
++;
1138 /* get the blockbitmap index respective to blockno */
1139 ibmap_idx
= fs
->curr_inode_no
/ inodes_per_grp
;
1140 struct ext2_block_group
*bgd
=
1141 ext4fs_get_group_descriptor(fs
, ibmap_idx
);
1142 uint16_t bg_flags
= ext4fs_bg_get_flags(bgd
);
1143 uint64_t i_bitmap_blk
= ext4fs_bg_get_inode_id(bgd
, fs
);
1145 if (bg_flags
& EXT4_BG_INODE_UNINIT
) {
1146 put_ext4(i_bitmap_blk
* fs
->blksz
,
1147 zero_buffer
, fs
->blksz
);
1148 bg_flags
&= ~EXT4_BG_INODE_UNINIT
;
1149 ext4fs_bg_set_flags(bgd
, bg_flags
);
1150 memcpy(fs
->inode_bmaps
[ibmap_idx
], zero_buffer
,
1154 if (ext4fs_set_inode_bmap(fs
->curr_inode_no
,
1155 fs
->inode_bmaps
[ibmap_idx
],
1157 debug("going for restart for the block no %d %u\n",
1158 fs
->curr_inode_no
, ibmap_idx
);
1162 /* journal backup */
1163 if (prev_inode_bitmap_index
!= ibmap_idx
) {
1164 status
= ext4fs_devread(i_bitmap_blk
* fs
->sect_perblk
,
1165 0, fs
->blksz
, journal_buffer
);
1168 if (ext4fs_log_journal(journal_buffer
,
1169 le32_to_cpu(bgd
->inode_id
)))
1171 prev_inode_bitmap_index
= ibmap_idx
;
1173 ext4fs_bg_free_inodes_dec(bgd
, fs
);
1175 bgd
->bg_itable_unused
= bgd
->free_inodes
;
1176 ext4fs_sb_free_inodes_dec(fs
->sb
);
1181 free(journal_buffer
);
1184 return fs
->curr_inode_no
;
1186 free(journal_buffer
);
1194 static void alloc_single_indirect_block(struct ext2_inode
*file_inode
,
1195 unsigned int *total_remaining_blocks
,
1196 unsigned int *no_blks_reqd
)
1200 long int actual_block_no
;
1201 long int si_blockno
;
1202 /* si :single indirect */
1203 __le32
*si_buffer
= NULL
;
1204 __le32
*si_start_addr
= NULL
;
1205 struct ext_filesystem
*fs
= get_fs();
1207 if (*total_remaining_blocks
!= 0) {
1208 si_buffer
= zalloc(fs
->blksz
);
1210 printf("No Memory\n");
1213 si_start_addr
= si_buffer
;
1214 si_blockno
= ext4fs_get_new_blk_no();
1215 if (si_blockno
== -1) {
1216 printf("no block left to assign\n");
1220 debug("SIPB %ld: %u\n", si_blockno
, *total_remaining_blocks
);
1222 status
= ext4fs_devread((lbaint_t
)si_blockno
* fs
->sect_perblk
,
1223 0, fs
->blksz
, (char *)si_buffer
);
1224 memset(si_buffer
, '\0', fs
->blksz
);
1228 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1229 actual_block_no
= ext4fs_get_new_blk_no();
1230 if (actual_block_no
== -1) {
1231 printf("no block left to assign\n");
1234 *si_buffer
= cpu_to_le32(actual_block_no
);
1235 debug("SIAB %u: %u\n", *si_buffer
,
1236 *total_remaining_blocks
);
1239 (*total_remaining_blocks
)--;
1240 if (*total_remaining_blocks
== 0)
1244 /* write the block to disk */
1245 put_ext4(((uint64_t) ((uint64_t)si_blockno
* (uint64_t)fs
->blksz
)),
1246 si_start_addr
, fs
->blksz
);
1247 file_inode
->b
.blocks
.indir_block
= cpu_to_le32(si_blockno
);
1250 free(si_start_addr
);
1253 static void alloc_double_indirect_block(struct ext2_inode
*file_inode
,
1254 unsigned int *total_remaining_blocks
,
1255 unsigned int *no_blks_reqd
)
1260 long int actual_block_no
;
1261 /* di:double indirect */
1262 long int di_blockno_parent
;
1263 long int di_blockno_child
;
1264 __le32
*di_parent_buffer
= NULL
;
1265 __le32
*di_child_buff
= NULL
;
1266 __le32
*di_block_start_addr
= NULL
;
1267 __le32
*di_child_buff_start
= NULL
;
1268 struct ext_filesystem
*fs
= get_fs();
1270 if (*total_remaining_blocks
!= 0) {
1271 /* double indirect parent block connecting to inode */
1272 di_blockno_parent
= ext4fs_get_new_blk_no();
1273 if (di_blockno_parent
== -1) {
1274 printf("no block left to assign\n");
1277 di_parent_buffer
= zalloc(fs
->blksz
);
1278 if (!di_parent_buffer
)
1281 di_block_start_addr
= di_parent_buffer
;
1283 debug("DIPB %ld: %u\n", di_blockno_parent
,
1284 *total_remaining_blocks
);
1286 status
= ext4fs_devread((lbaint_t
)di_blockno_parent
*
1288 fs
->blksz
, (char *)di_parent_buffer
);
1291 printf("%s: Device read error!\n", __func__
);
1294 memset(di_parent_buffer
, '\0', fs
->blksz
);
1297 * start:for each double indirect parent
1298 * block create one more block
1300 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1301 di_blockno_child
= ext4fs_get_new_blk_no();
1302 if (di_blockno_child
== -1) {
1303 printf("no block left to assign\n");
1306 di_child_buff
= zalloc(fs
->blksz
);
1310 di_child_buff_start
= di_child_buff
;
1311 *di_parent_buffer
= cpu_to_le32(di_blockno_child
);
1314 debug("DICB %ld: %u\n", di_blockno_child
,
1315 *total_remaining_blocks
);
1317 status
= ext4fs_devread((lbaint_t
)di_blockno_child
*
1320 (char *)di_child_buff
);
1323 printf("%s: Device read error!\n", __func__
);
1326 memset(di_child_buff
, '\0', fs
->blksz
);
1327 /* filling of actual datablocks for each child */
1328 for (j
= 0; j
< (fs
->blksz
/ sizeof(int)); j
++) {
1329 actual_block_no
= ext4fs_get_new_blk_no();
1330 if (actual_block_no
== -1) {
1331 printf("no block left to assign\n");
1334 *di_child_buff
= cpu_to_le32(actual_block_no
);
1335 debug("DIAB %ld: %u\n", actual_block_no
,
1336 *total_remaining_blocks
);
1339 (*total_remaining_blocks
)--;
1340 if (*total_remaining_blocks
== 0)
1343 /* write the block table */
1344 put_ext4(((uint64_t) ((uint64_t)di_blockno_child
* (uint64_t)fs
->blksz
)),
1345 di_child_buff_start
, fs
->blksz
);
1346 free(di_child_buff_start
);
1347 di_child_buff_start
= NULL
;
1349 if (*total_remaining_blocks
== 0)
1352 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent
* (uint64_t)fs
->blksz
)),
1353 di_block_start_addr
, fs
->blksz
);
1354 file_inode
->b
.blocks
.double_indir_block
= cpu_to_le32(di_blockno_parent
);
1357 free(di_block_start_addr
);
1360 static void alloc_triple_indirect_block(struct ext2_inode
*file_inode
,
1361 unsigned int *total_remaining_blocks
,
1362 unsigned int *no_blks_reqd
)
1367 long int actual_block_no
;
1368 /* ti: Triple Indirect */
1369 long int ti_gp_blockno
;
1370 long int ti_parent_blockno
;
1371 long int ti_child_blockno
;
1372 __le32
*ti_gp_buff
= NULL
;
1373 __le32
*ti_parent_buff
= NULL
;
1374 __le32
*ti_child_buff
= NULL
;
1375 __le32
*ti_gp_buff_start_addr
= NULL
;
1376 __le32
*ti_pbuff_start_addr
= NULL
;
1377 __le32
*ti_cbuff_start_addr
= NULL
;
1378 struct ext_filesystem
*fs
= get_fs();
1379 if (*total_remaining_blocks
!= 0) {
1380 /* triple indirect grand parent block connecting to inode */
1381 ti_gp_blockno
= ext4fs_get_new_blk_no();
1382 if (ti_gp_blockno
== -1) {
1383 printf("no block left to assign\n");
1386 ti_gp_buff
= zalloc(fs
->blksz
);
1390 ti_gp_buff_start_addr
= ti_gp_buff
;
1392 debug("TIGPB %ld: %u\n", ti_gp_blockno
,
1393 *total_remaining_blocks
);
1395 /* for each 4 byte grand parent entry create one more block */
1396 for (i
= 0; i
< (fs
->blksz
/ sizeof(int)); i
++) {
1397 ti_parent_blockno
= ext4fs_get_new_blk_no();
1398 if (ti_parent_blockno
== -1) {
1399 printf("no block left to assign\n");
1402 ti_parent_buff
= zalloc(fs
->blksz
);
1403 if (!ti_parent_buff
)
1406 ti_pbuff_start_addr
= ti_parent_buff
;
1407 *ti_gp_buff
= cpu_to_le32(ti_parent_blockno
);
1410 debug("TIPB %ld: %u\n", ti_parent_blockno
,
1411 *total_remaining_blocks
);
1413 /* for each 4 byte entry parent create one more block */
1414 for (j
= 0; j
< (fs
->blksz
/ sizeof(int)); j
++) {
1415 ti_child_blockno
= ext4fs_get_new_blk_no();
1416 if (ti_child_blockno
== -1) {
1417 printf("no block left assign\n");
1420 ti_child_buff
= zalloc(fs
->blksz
);
1424 ti_cbuff_start_addr
= ti_child_buff
;
1425 *ti_parent_buff
= cpu_to_le32(ti_child_blockno
);
1428 debug("TICB %ld: %u\n", ti_parent_blockno
,
1429 *total_remaining_blocks
);
1431 /* fill actual datablocks for each child */
1432 for (k
= 0; k
< (fs
->blksz
/ sizeof(int));
1435 ext4fs_get_new_blk_no();
1436 if (actual_block_no
== -1) {
1437 printf("no block left\n");
1438 free(ti_cbuff_start_addr
);
1441 *ti_child_buff
= cpu_to_le32(actual_block_no
);
1442 debug("TIAB %ld: %u\n", actual_block_no
,
1443 *total_remaining_blocks
);
1446 (*total_remaining_blocks
)--;
1447 if (*total_remaining_blocks
== 0)
1450 /* write the child block */
1451 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno
*
1452 (uint64_t)fs
->blksz
)),
1453 ti_cbuff_start_addr
, fs
->blksz
);
1454 free(ti_cbuff_start_addr
);
1456 if (*total_remaining_blocks
== 0)
1459 /* write the parent block */
1460 put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno
* (uint64_t)fs
->blksz
)),
1461 ti_pbuff_start_addr
, fs
->blksz
);
1462 free(ti_pbuff_start_addr
);
1464 if (*total_remaining_blocks
== 0)
1467 /* write the grand parent block */
1468 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno
* (uint64_t)fs
->blksz
)),
1469 ti_gp_buff_start_addr
, fs
->blksz
);
1470 file_inode
->b
.blocks
.triple_indir_block
= cpu_to_le32(ti_gp_blockno
);
1471 free(ti_gp_buff_start_addr
);
1475 free(ti_pbuff_start_addr
);
1477 free(ti_gp_buff_start_addr
);
1480 void ext4fs_allocate_blocks(struct ext2_inode
*file_inode
,
1481 unsigned int total_remaining_blocks
,
1482 unsigned int *total_no_of_block
)
1485 long int direct_blockno
;
1486 unsigned int no_blks_reqd
= 0;
1488 /* allocation of direct blocks */
1489 for (i
= 0; total_remaining_blocks
&& i
< INDIRECT_BLOCKS
; i
++) {
1490 direct_blockno
= ext4fs_get_new_blk_no();
1491 if (direct_blockno
== -1) {
1492 printf("no block left to assign\n");
1495 file_inode
->b
.blocks
.dir_blocks
[i
] = cpu_to_le32(direct_blockno
);
1496 debug("DB %ld: %u\n", direct_blockno
, total_remaining_blocks
);
1498 total_remaining_blocks
--;
1501 alloc_single_indirect_block(file_inode
, &total_remaining_blocks
,
1503 alloc_double_indirect_block(file_inode
, &total_remaining_blocks
,
1505 alloc_triple_indirect_block(file_inode
, &total_remaining_blocks
,
1507 *total_no_of_block
+= no_blks_reqd
;
1512 static struct ext4_extent_header
*ext4fs_get_extent_block
1513 (struct ext2_data
*data
, char *buf
,
1514 struct ext4_extent_header
*ext_block
,
1515 uint32_t fileblock
, int log2_blksz
)
1517 struct ext4_extent_idx
*index
;
1518 unsigned long long block
;
1519 int blksz
= EXT2_BLOCK_SIZE(data
);
1523 index
= (struct ext4_extent_idx
*)(ext_block
+ 1);
1525 if (le16_to_cpu(ext_block
->eh_magic
) != EXT4_EXT_MAGIC
)
1528 if (ext_block
->eh_depth
== 0)
1533 if (i
>= le16_to_cpu(ext_block
->eh_entries
))
1535 } while (fileblock
>= le32_to_cpu(index
[i
].ei_block
));
1540 block
= le16_to_cpu(index
[i
].ei_leaf_hi
);
1541 block
= (block
<< 32) + le32_to_cpu(index
[i
].ei_leaf_lo
);
1543 if (ext4fs_devread((lbaint_t
)block
<< log2_blksz
, 0, blksz
,
1545 ext_block
= (struct ext4_extent_header
*)buf
;
1551 static int ext4fs_blockgroup
1552 (struct ext2_data
*data
, int group
, struct ext2_block_group
*blkgrp
)
1555 unsigned int blkoff
, desc_per_blk
;
1556 int log2blksz
= get_fs()->dev_desc
->log2blksz
;
1557 int desc_size
= get_fs()->gdsize
;
1559 desc_per_blk
= EXT2_BLOCK_SIZE(data
) / desc_size
;
1561 blkno
= le32_to_cpu(data
->sblock
.first_data_block
) + 1 +
1562 group
/ desc_per_blk
;
1563 blkoff
= (group
% desc_per_blk
) * desc_size
;
1565 debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1566 group
, blkno
, blkoff
);
1568 return ext4fs_devread((lbaint_t
)blkno
<<
1569 (LOG2_BLOCK_SIZE(data
) - log2blksz
),
1570 blkoff
, desc_size
, (char *)blkgrp
);
1573 int ext4fs_read_inode(struct ext2_data
*data
, int ino
, struct ext2_inode
*inode
)
1575 struct ext2_block_group blkgrp
;
1576 struct ext2_sblock
*sblock
= &data
->sblock
;
1577 struct ext_filesystem
*fs
= get_fs();
1578 int log2blksz
= get_fs()->dev_desc
->log2blksz
;
1579 int inodes_per_block
, status
;
1581 unsigned int blkoff
;
1583 /* It is easier to calculate if the first inode is 0. */
1585 status
= ext4fs_blockgroup(data
, ino
/ le32_to_cpu
1586 (sblock
->inodes_per_group
), &blkgrp
);
1590 inodes_per_block
= EXT2_BLOCK_SIZE(data
) / fs
->inodesz
;
1591 blkno
= ext4fs_bg_get_inode_table_id(&blkgrp
, fs
) +
1592 (ino
% le32_to_cpu(sblock
->inodes_per_group
)) / inodes_per_block
;
1593 blkoff
= (ino
% inodes_per_block
) * fs
->inodesz
;
1594 /* Read the inode. */
1595 status
= ext4fs_devread((lbaint_t
)blkno
<< (LOG2_BLOCK_SIZE(data
) -
1597 sizeof(struct ext2_inode
), (char *)inode
);
1604 long int read_allocated_block(struct ext2_inode
*inode
, int fileblock
)
1611 long int perblock_parent
;
1612 long int perblock_child
;
1613 unsigned long long start
;
1614 /* get the blocksize of the filesystem */
1615 blksz
= EXT2_BLOCK_SIZE(ext4fs_root
);
1616 log2_blksz
= LOG2_BLOCK_SIZE(ext4fs_root
)
1617 - get_fs()->dev_desc
->log2blksz
;
1619 if (le32_to_cpu(inode
->flags
) & EXT4_EXTENTS_FL
) {
1620 long int startblock
, endblock
;
1621 char *buf
= zalloc(blksz
);
1624 struct ext4_extent_header
*ext_block
;
1625 struct ext4_extent
*extent
;
1628 ext4fs_get_extent_block(ext4fs_root
, buf
,
1629 (struct ext4_extent_header
*)
1630 inode
->b
.blocks
.dir_blocks
,
1631 fileblock
, log2_blksz
);
1633 printf("invalid extent block\n");
1638 extent
= (struct ext4_extent
*)(ext_block
+ 1);
1640 for (i
= 0; i
< le16_to_cpu(ext_block
->eh_entries
); i
++) {
1641 startblock
= le32_to_cpu(extent
[i
].ee_block
);
1642 endblock
= startblock
+ le16_to_cpu(extent
[i
].ee_len
);
1644 if (startblock
> fileblock
) {
1649 } else if (fileblock
< endblock
) {
1650 start
= le16_to_cpu(extent
[i
].ee_start_hi
);
1651 start
= (start
<< 32) +
1652 le32_to_cpu(extent
[i
].ee_start_lo
);
1654 return (fileblock
- startblock
) + start
;
1662 /* Direct blocks. */
1663 if (fileblock
< INDIRECT_BLOCKS
)
1664 blknr
= le32_to_cpu(inode
->b
.blocks
.dir_blocks
[fileblock
]);
1667 else if (fileblock
< (INDIRECT_BLOCKS
+ (blksz
/ 4))) {
1668 if (ext4fs_indir1_block
== NULL
) {
1669 ext4fs_indir1_block
= zalloc(blksz
);
1670 if (ext4fs_indir1_block
== NULL
) {
1671 printf("** SI ext2fs read block (indir 1)"
1672 "malloc failed. **\n");
1675 ext4fs_indir1_size
= blksz
;
1676 ext4fs_indir1_blkno
= -1;
1678 if (blksz
!= ext4fs_indir1_size
) {
1679 free(ext4fs_indir1_block
);
1680 ext4fs_indir1_block
= NULL
;
1681 ext4fs_indir1_size
= 0;
1682 ext4fs_indir1_blkno
= -1;
1683 ext4fs_indir1_block
= zalloc(blksz
);
1684 if (ext4fs_indir1_block
== NULL
) {
1685 printf("** SI ext2fs read block (indir 1):"
1686 "malloc failed. **\n");
1689 ext4fs_indir1_size
= blksz
;
1691 if ((le32_to_cpu(inode
->b
.blocks
.indir_block
) <<
1692 log2_blksz
) != ext4fs_indir1_blkno
) {
1694 ext4fs_devread((lbaint_t
)le32_to_cpu
1696 indir_block
) << log2_blksz
, 0,
1697 blksz
, (char *)ext4fs_indir1_block
);
1699 printf("** SI ext2fs read block (indir 1)"
1703 ext4fs_indir1_blkno
=
1704 le32_to_cpu(inode
->b
.blocks
.
1705 indir_block
) << log2_blksz
;
1707 blknr
= le32_to_cpu(ext4fs_indir1_block
1708 [fileblock
- INDIRECT_BLOCKS
]);
1710 /* Double indirect. */
1711 else if (fileblock
< (INDIRECT_BLOCKS
+ (blksz
/ 4 *
1712 (blksz
/ 4 + 1)))) {
1714 long int perblock
= blksz
/ 4;
1715 long int rblock
= fileblock
- (INDIRECT_BLOCKS
+ blksz
/ 4);
1717 if (ext4fs_indir1_block
== NULL
) {
1718 ext4fs_indir1_block
= zalloc(blksz
);
1719 if (ext4fs_indir1_block
== NULL
) {
1720 printf("** DI ext2fs read block (indir 2 1)"
1721 "malloc failed. **\n");
1724 ext4fs_indir1_size
= blksz
;
1725 ext4fs_indir1_blkno
= -1;
1727 if (blksz
!= ext4fs_indir1_size
) {
1728 free(ext4fs_indir1_block
);
1729 ext4fs_indir1_block
= NULL
;
1730 ext4fs_indir1_size
= 0;
1731 ext4fs_indir1_blkno
= -1;
1732 ext4fs_indir1_block
= zalloc(blksz
);
1733 if (ext4fs_indir1_block
== NULL
) {
1734 printf("** DI ext2fs read block (indir 2 1)"
1735 "malloc failed. **\n");
1738 ext4fs_indir1_size
= blksz
;
1740 if ((le32_to_cpu(inode
->b
.blocks
.double_indir_block
) <<
1741 log2_blksz
) != ext4fs_indir1_blkno
) {
1743 ext4fs_devread((lbaint_t
)le32_to_cpu
1745 double_indir_block
) << log2_blksz
,
1747 (char *)ext4fs_indir1_block
);
1749 printf("** DI ext2fs read block (indir 2 1)"
1753 ext4fs_indir1_blkno
=
1754 le32_to_cpu(inode
->b
.blocks
.double_indir_block
) <<
1758 if (ext4fs_indir2_block
== NULL
) {
1759 ext4fs_indir2_block
= zalloc(blksz
);
1760 if (ext4fs_indir2_block
== NULL
) {
1761 printf("** DI ext2fs read block (indir 2 2)"
1762 "malloc failed. **\n");
1765 ext4fs_indir2_size
= blksz
;
1766 ext4fs_indir2_blkno
= -1;
1768 if (blksz
!= ext4fs_indir2_size
) {
1769 free(ext4fs_indir2_block
);
1770 ext4fs_indir2_block
= NULL
;
1771 ext4fs_indir2_size
= 0;
1772 ext4fs_indir2_blkno
= -1;
1773 ext4fs_indir2_block
= zalloc(blksz
);
1774 if (ext4fs_indir2_block
== NULL
) {
1775 printf("** DI ext2fs read block (indir 2 2)"
1776 "malloc failed. **\n");
1779 ext4fs_indir2_size
= blksz
;
1781 if ((le32_to_cpu(ext4fs_indir1_block
[rblock
/ perblock
]) <<
1782 log2_blksz
) != ext4fs_indir2_blkno
) {
1783 status
= ext4fs_devread((lbaint_t
)le32_to_cpu
1784 (ext4fs_indir1_block
1786 perblock
]) << log2_blksz
, 0,
1788 (char *)ext4fs_indir2_block
);
1790 printf("** DI ext2fs read block (indir 2 2)"
1794 ext4fs_indir2_blkno
=
1795 le32_to_cpu(ext4fs_indir1_block
[rblock
1800 blknr
= le32_to_cpu(ext4fs_indir2_block
[rblock
% perblock
]);
1802 /* Tripple indirect. */
1804 rblock
= fileblock
- (INDIRECT_BLOCKS
+ blksz
/ 4 +
1805 (blksz
/ 4 * blksz
/ 4));
1806 perblock_child
= blksz
/ 4;
1807 perblock_parent
= ((blksz
/ 4) * (blksz
/ 4));
1809 if (ext4fs_indir1_block
== NULL
) {
1810 ext4fs_indir1_block
= zalloc(blksz
);
1811 if (ext4fs_indir1_block
== NULL
) {
1812 printf("** TI ext2fs read block (indir 2 1)"
1813 "malloc failed. **\n");
1816 ext4fs_indir1_size
= blksz
;
1817 ext4fs_indir1_blkno
= -1;
1819 if (blksz
!= ext4fs_indir1_size
) {
1820 free(ext4fs_indir1_block
);
1821 ext4fs_indir1_block
= NULL
;
1822 ext4fs_indir1_size
= 0;
1823 ext4fs_indir1_blkno
= -1;
1824 ext4fs_indir1_block
= zalloc(blksz
);
1825 if (ext4fs_indir1_block
== NULL
) {
1826 printf("** TI ext2fs read block (indir 2 1)"
1827 "malloc failed. **\n");
1830 ext4fs_indir1_size
= blksz
;
1832 if ((le32_to_cpu(inode
->b
.blocks
.triple_indir_block
) <<
1833 log2_blksz
) != ext4fs_indir1_blkno
) {
1834 status
= ext4fs_devread
1836 le32_to_cpu(inode
->b
.blocks
.triple_indir_block
)
1837 << log2_blksz
, 0, blksz
,
1838 (char *)ext4fs_indir1_block
);
1840 printf("** TI ext2fs read block (indir 2 1)"
1844 ext4fs_indir1_blkno
=
1845 le32_to_cpu(inode
->b
.blocks
.triple_indir_block
) <<
1849 if (ext4fs_indir2_block
== NULL
) {
1850 ext4fs_indir2_block
= zalloc(blksz
);
1851 if (ext4fs_indir2_block
== NULL
) {
1852 printf("** TI ext2fs read block (indir 2 2)"
1853 "malloc failed. **\n");
1856 ext4fs_indir2_size
= blksz
;
1857 ext4fs_indir2_blkno
= -1;
1859 if (blksz
!= ext4fs_indir2_size
) {
1860 free(ext4fs_indir2_block
);
1861 ext4fs_indir2_block
= NULL
;
1862 ext4fs_indir2_size
= 0;
1863 ext4fs_indir2_blkno
= -1;
1864 ext4fs_indir2_block
= zalloc(blksz
);
1865 if (ext4fs_indir2_block
== NULL
) {
1866 printf("** TI ext2fs read block (indir 2 2)"
1867 "malloc failed. **\n");
1870 ext4fs_indir2_size
= blksz
;
1872 if ((le32_to_cpu(ext4fs_indir1_block
[rblock
/
1873 perblock_parent
]) <<
1875 != ext4fs_indir2_blkno
) {
1876 status
= ext4fs_devread((lbaint_t
)le32_to_cpu
1877 (ext4fs_indir1_block
1879 perblock_parent
]) <<
1880 log2_blksz
, 0, blksz
,
1881 (char *)ext4fs_indir2_block
);
1883 printf("** TI ext2fs read block (indir 2 2)"
1887 ext4fs_indir2_blkno
=
1888 le32_to_cpu(ext4fs_indir1_block
[rblock
/
1893 if (ext4fs_indir3_block
== NULL
) {
1894 ext4fs_indir3_block
= zalloc(blksz
);
1895 if (ext4fs_indir3_block
== NULL
) {
1896 printf("** TI ext2fs read block (indir 2 2)"
1897 "malloc failed. **\n");
1900 ext4fs_indir3_size
= blksz
;
1901 ext4fs_indir3_blkno
= -1;
1903 if (blksz
!= ext4fs_indir3_size
) {
1904 free(ext4fs_indir3_block
);
1905 ext4fs_indir3_block
= NULL
;
1906 ext4fs_indir3_size
= 0;
1907 ext4fs_indir3_blkno
= -1;
1908 ext4fs_indir3_block
= zalloc(blksz
);
1909 if (ext4fs_indir3_block
== NULL
) {
1910 printf("** TI ext2fs read block (indir 2 2)"
1911 "malloc failed. **\n");
1914 ext4fs_indir3_size
= blksz
;
1916 if ((le32_to_cpu(ext4fs_indir2_block
[rblock
1919 log2_blksz
) != ext4fs_indir3_blkno
) {
1921 ext4fs_devread((lbaint_t
)le32_to_cpu
1922 (ext4fs_indir2_block
1923 [(rblock
/ perblock_child
)
1924 % (blksz
/ 4)]) << log2_blksz
, 0,
1925 blksz
, (char *)ext4fs_indir3_block
);
1927 printf("** TI ext2fs read block (indir 2 2)"
1931 ext4fs_indir3_blkno
=
1932 le32_to_cpu(ext4fs_indir2_block
[(rblock
/
1939 blknr
= le32_to_cpu(ext4fs_indir3_block
1940 [rblock
% perblock_child
]);
1942 debug("read_allocated_block %ld\n", blknr
);
1948 * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1951 * This function assures that for a file with the same name but different size
1952 * the sequential store on the ext4 filesystem will be correct.
1954 * In this function the global data, responsible for internal representation
1955 * of the ext4 data are initialized to the reset state. Without this, during
1956 * replacement of the smaller file with the bigger truncation of new file was
1959 void ext4fs_reinit_global(void)
1961 if (ext4fs_indir1_block
!= NULL
) {
1962 free(ext4fs_indir1_block
);
1963 ext4fs_indir1_block
= NULL
;
1964 ext4fs_indir1_size
= 0;
1965 ext4fs_indir1_blkno
= -1;
1967 if (ext4fs_indir2_block
!= NULL
) {
1968 free(ext4fs_indir2_block
);
1969 ext4fs_indir2_block
= NULL
;
1970 ext4fs_indir2_size
= 0;
1971 ext4fs_indir2_blkno
= -1;
1973 if (ext4fs_indir3_block
!= NULL
) {
1974 free(ext4fs_indir3_block
);
1975 ext4fs_indir3_block
= NULL
;
1976 ext4fs_indir3_size
= 0;
1977 ext4fs_indir3_blkno
= -1;
1980 void ext4fs_close(void)
1982 if ((ext4fs_file
!= NULL
) && (ext4fs_root
!= NULL
)) {
1983 ext4fs_free_node(ext4fs_file
, &ext4fs_root
->diropen
);
1986 if (ext4fs_root
!= NULL
) {
1991 ext4fs_reinit_global();
1994 int ext4fs_iterate_dir(struct ext2fs_node
*dir
, char *name
,
1995 struct ext2fs_node
**fnode
, int *ftype
)
1997 unsigned int fpos
= 0;
2000 struct ext2fs_node
*diro
= (struct ext2fs_node
*) dir
;
2004 printf("Iterate dir %s\n", name
);
2005 #endif /* of DEBUG */
2006 if (!diro
->inode_read
) {
2007 status
= ext4fs_read_inode(diro
->data
, diro
->ino
, &diro
->inode
);
2011 /* Search the file. */
2012 while (fpos
< le32_to_cpu(diro
->inode
.size
)) {
2013 struct ext2_dirent dirent
;
2015 status
= ext4fs_read_file(diro
, fpos
,
2016 sizeof(struct ext2_dirent
),
2017 (char *)&dirent
, &actread
);
2021 if (dirent
.direntlen
== 0) {
2022 printf("Failed to iterate over directory %s\n", name
);
2026 if (dirent
.namelen
!= 0) {
2027 char filename
[dirent
.namelen
+ 1];
2028 struct ext2fs_node
*fdiro
;
2029 int type
= FILETYPE_UNKNOWN
;
2031 status
= ext4fs_read_file(diro
,
2033 sizeof(struct ext2_dirent
),
2034 dirent
.namelen
, filename
,
2039 fdiro
= zalloc(sizeof(struct ext2fs_node
));
2043 fdiro
->data
= diro
->data
;
2044 fdiro
->ino
= le32_to_cpu(dirent
.inode
);
2046 filename
[dirent
.namelen
] = '\0';
2048 if (dirent
.filetype
!= FILETYPE_UNKNOWN
) {
2049 fdiro
->inode_read
= 0;
2051 if (dirent
.filetype
== FILETYPE_DIRECTORY
)
2052 type
= FILETYPE_DIRECTORY
;
2053 else if (dirent
.filetype
== FILETYPE_SYMLINK
)
2054 type
= FILETYPE_SYMLINK
;
2055 else if (dirent
.filetype
== FILETYPE_REG
)
2056 type
= FILETYPE_REG
;
2058 status
= ext4fs_read_inode(diro
->data
,
2066 fdiro
->inode_read
= 1;
2068 if ((le16_to_cpu(fdiro
->inode
.mode
) &
2069 FILETYPE_INO_MASK
) ==
2070 FILETYPE_INO_DIRECTORY
) {
2071 type
= FILETYPE_DIRECTORY
;
2072 } else if ((le16_to_cpu(fdiro
->inode
.mode
)
2073 & FILETYPE_INO_MASK
) ==
2074 FILETYPE_INO_SYMLINK
) {
2075 type
= FILETYPE_SYMLINK
;
2076 } else if ((le16_to_cpu(fdiro
->inode
.mode
)
2077 & FILETYPE_INO_MASK
) ==
2079 type
= FILETYPE_REG
;
2083 printf("iterate >%s<\n", filename
);
2084 #endif /* of DEBUG */
2085 if ((name
!= NULL
) && (fnode
!= NULL
)
2086 && (ftype
!= NULL
)) {
2087 if (strcmp(filename
, name
) == 0) {
2093 if (fdiro
->inode_read
== 0) {
2094 status
= ext4fs_read_inode(diro
->data
,
2102 fdiro
->inode_read
= 1;
2105 case FILETYPE_DIRECTORY
:
2108 case FILETYPE_SYMLINK
:
2119 le32_to_cpu(fdiro
->inode
.size
),
2124 fpos
+= le16_to_cpu(dirent
.direntlen
);
2129 static char *ext4fs_read_symlink(struct ext2fs_node
*node
)
2132 struct ext2fs_node
*diro
= node
;
2136 if (!diro
->inode_read
) {
2137 status
= ext4fs_read_inode(diro
->data
, diro
->ino
, &diro
->inode
);
2141 symlink
= zalloc(le32_to_cpu(diro
->inode
.size
) + 1);
2145 if (le32_to_cpu(diro
->inode
.size
) < sizeof(diro
->inode
.b
.symlink
)) {
2146 strncpy(symlink
, diro
->inode
.b
.symlink
,
2147 le32_to_cpu(diro
->inode
.size
));
2149 status
= ext4fs_read_file(diro
, 0,
2150 le32_to_cpu(diro
->inode
.size
),
2152 if ((status
< 0) || (actread
== 0)) {
2157 symlink
[le32_to_cpu(diro
->inode
.size
)] = '\0';
2161 static int ext4fs_find_file1(const char *currpath
,
2162 struct ext2fs_node
*currroot
,
2163 struct ext2fs_node
**currfound
, int *foundtype
)
2165 char fpath
[strlen(currpath
) + 1];
2169 int type
= FILETYPE_DIRECTORY
;
2170 struct ext2fs_node
*currnode
= currroot
;
2171 struct ext2fs_node
*oldnode
= currroot
;
2173 strncpy(fpath
, currpath
, strlen(currpath
) + 1);
2175 /* Remove all leading slashes. */
2176 while (*name
== '/')
2180 *currfound
= currnode
;
2187 /* Extract the actual part from the pathname. */
2188 next
= strchr(name
, '/');
2190 /* Remove all leading slashes. */
2191 while (*next
== '/')
2195 if (type
!= FILETYPE_DIRECTORY
) {
2196 ext4fs_free_node(currnode
, currroot
);
2202 /* Iterate over the directory. */
2203 found
= ext4fs_iterate_dir(currnode
, name
, &currnode
, &type
);
2210 /* Read in the symlink and follow it. */
2211 if (type
== FILETYPE_SYMLINK
) {
2214 /* Test if the symlink does not loop. */
2215 if (++symlinknest
== 8) {
2216 ext4fs_free_node(currnode
, currroot
);
2217 ext4fs_free_node(oldnode
, currroot
);
2221 symlink
= ext4fs_read_symlink(currnode
);
2222 ext4fs_free_node(currnode
, currroot
);
2225 ext4fs_free_node(oldnode
, currroot
);
2229 debug("Got symlink >%s<\n", symlink
);
2231 if (symlink
[0] == '/') {
2232 ext4fs_free_node(oldnode
, currroot
);
2233 oldnode
= &ext4fs_root
->diropen
;
2236 /* Lookup the node the symlink points to. */
2237 status
= ext4fs_find_file1(symlink
, oldnode
,
2243 ext4fs_free_node(oldnode
, currroot
);
2248 ext4fs_free_node(oldnode
, currroot
);
2250 /* Found the node! */
2251 if (!next
|| *next
== '\0') {
2252 *currfound
= currnode
;
2261 int ext4fs_find_file(const char *path
, struct ext2fs_node
*rootnode
,
2262 struct ext2fs_node
**foundnode
, int expecttype
)
2265 int foundtype
= FILETYPE_DIRECTORY
;
2271 status
= ext4fs_find_file1(path
, rootnode
, foundnode
, &foundtype
);
2275 /* Check if the node that was found was of the expected type. */
2276 if ((expecttype
== FILETYPE_REG
) && (foundtype
!= expecttype
))
2278 else if ((expecttype
== FILETYPE_DIRECTORY
)
2279 && (foundtype
!= expecttype
))
2285 int ext4fs_open(const char *filename
, loff_t
*len
)
2287 struct ext2fs_node
*fdiro
= NULL
;
2290 if (ext4fs_root
== NULL
)
2294 status
= ext4fs_find_file(filename
, &ext4fs_root
->diropen
, &fdiro
,
2299 if (!fdiro
->inode_read
) {
2300 status
= ext4fs_read_inode(fdiro
->data
, fdiro
->ino
,
2305 *len
= le32_to_cpu(fdiro
->inode
.size
);
2306 ext4fs_file
= fdiro
;
2310 ext4fs_free_node(fdiro
, &ext4fs_root
->diropen
);
2315 int ext4fs_mount(unsigned part_length
)
2317 struct ext2_data
*data
;
2319 struct ext_filesystem
*fs
= get_fs();
2320 data
= zalloc(SUPERBLOCK_SIZE
);
2324 /* Read the superblock. */
2325 status
= ext4_read_superblock((char *)&data
->sblock
);
2330 /* Make sure this is an ext2 filesystem. */
2331 if (le16_to_cpu(data
->sblock
.magic
) != EXT2_MAGIC
)
2335 if (le32_to_cpu(data
->sblock
.revision_level
) == 0) {
2338 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2339 __le32_to_cpu(data
->sblock
.feature_compatibility
),
2340 __le32_to_cpu(data
->sblock
.feature_incompat
),
2341 __le32_to_cpu(data
->sblock
.feature_ro_compat
));
2343 fs
->inodesz
= le16_to_cpu(data
->sblock
.inode_size
);
2344 fs
->gdsize
= le32_to_cpu(data
->sblock
.feature_incompat
) &
2345 EXT4_FEATURE_INCOMPAT_64BIT
?
2346 le16_to_cpu(data
->sblock
.descriptor_size
) : 32;
2349 debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2350 le32_to_cpu(data
->sblock
.revision_level
),
2351 fs
->inodesz
, fs
->gdsize
);
2353 data
->diropen
.data
= data
;
2354 data
->diropen
.ino
= 2;
2355 data
->diropen
.inode_read
= 1;
2356 data
->inode
= &data
->diropen
.inode
;
2358 status
= ext4fs_read_inode(data
, 2, data
->inode
);
2366 printf("Failed to mount ext2 filesystem...\n");