]>
git.ipfire.org Git - people/ms/u-boot.git/blob - fs/ext4/dev.c
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 * made from existing ext2/dev.c file of Uboot
9 * esd gmbh <www.esd-electronics.com>
10 * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
12 * based on code of fs/reiserfs/dev.c by
14 * (C) Copyright 2003 - 2004
15 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
17 * SPDX-License-Identifier: GPL-2.0+
22 * 0.1 - Newly created file for ext4fs support. Taken from
23 * fs/ext2/dev.c file in uboot.
31 #include <ext_common.h>
32 #include "ext4_common.h"
36 static struct blk_desc
*ext4fs_blk_desc
;
37 static disk_partition_t
*part_info
;
39 void ext4fs_set_blk_dev(struct blk_desc
*rbdd
, disk_partition_t
*info
)
41 assert(rbdd
->blksz
== (1 << rbdd
->log2blksz
));
42 ext4fs_blk_desc
= rbdd
;
43 get_fs()->dev_desc
= rbdd
;
45 part_offset
= info
->start
;
46 get_fs()->total_sect
= ((uint64_t)info
->size
* info
->blksz
) >>
47 get_fs()->dev_desc
->log2blksz
;
50 int ext4fs_devread(lbaint_t sector
, int byte_offset
, int byte_len
, char *buf
)
53 int log2blksz
= ext4fs_blk_desc
->log2blksz
;
54 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf
, (ext4fs_blk_desc
?
55 ext4fs_blk_desc
->blksz
:
57 if (ext4fs_blk_desc
== NULL
) {
58 printf("** Invalid Block Device Descriptor (NULL)\n");
62 /* Check partition boundaries */
64 ((sector
+ ((byte_offset
+ byte_len
- 1) >> log2blksz
))
65 >= part_info
->size
)) {
66 printf("%s read outside partition " LBAFU
"\n", __func__
,
71 /* Get the read to the beginning of a partition */
72 sector
+= byte_offset
>> log2blksz
;
73 byte_offset
&= ext4fs_blk_desc
->blksz
- 1;
75 debug(" <" LBAFU
", %d, %d>\n", sector
, byte_offset
, byte_len
);
77 if (byte_offset
!= 0) {
79 /* read first part which isn't aligned with start of sector */
80 if (blk_dread(ext4fs_blk_desc
, part_info
->start
+ sector
, 1,
81 (void *)sec_buf
) != 1) {
82 printf(" ** ext2fs_devread() read error **\n");
85 readlen
= min((int)ext4fs_blk_desc
->blksz
- byte_offset
,
87 memcpy(buf
, sec_buf
+ byte_offset
, readlen
);
96 /* read sector aligned part */
97 block_len
= byte_len
& ~(ext4fs_blk_desc
->blksz
- 1);
100 ALLOC_CACHE_ALIGN_BUFFER(u8
, p
, ext4fs_blk_desc
->blksz
);
102 block_len
= ext4fs_blk_desc
->blksz
;
103 blk_dread(ext4fs_blk_desc
, part_info
->start
+ sector
, 1,
105 memcpy(buf
, p
, byte_len
);
109 if (blk_dread(ext4fs_blk_desc
, part_info
->start
+ sector
,
110 block_len
>> log2blksz
, (void *)buf
) !=
111 block_len
>> log2blksz
) {
112 printf(" ** %s read error - block\n", __func__
);
115 block_len
= byte_len
& ~(ext4fs_blk_desc
->blksz
- 1);
117 byte_len
-= block_len
;
118 sector
+= block_len
/ ext4fs_blk_desc
->blksz
;
121 /* read rest of data which are not in whole sector */
122 if (blk_dread(ext4fs_blk_desc
, part_info
->start
+ sector
, 1,
123 (void *)sec_buf
) != 1) {
124 printf("* %s read error - last part\n", __func__
);
127 memcpy(buf
, sec_buf
, byte_len
);
132 int ext4_read_superblock(char *buffer
)
134 struct ext_filesystem
*fs
= get_fs();
135 int sect
= SUPERBLOCK_START
>> fs
->dev_desc
->log2blksz
;
136 int off
= SUPERBLOCK_START
% fs
->dev_desc
->blksz
;
138 return ext4fs_devread(sect
, off
, SUPERBLOCK_SIZE
,