]>
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.
30 #include <ext_common.h>
31 #include "ext4_common.h"
35 static block_dev_desc_t
*ext4fs_block_dev_desc
;
36 static disk_partition_t
*part_info
;
38 void ext4fs_set_blk_dev(block_dev_desc_t
*rbdd
, disk_partition_t
*info
)
40 assert(rbdd
->blksz
== (1 << rbdd
->log2blksz
));
41 ext4fs_block_dev_desc
= rbdd
;
42 get_fs()->dev_desc
= rbdd
;
44 part_offset
= info
->start
;
45 get_fs()->total_sect
= ((uint64_t)info
->size
* info
->blksz
) >>
46 get_fs()->dev_desc
->log2blksz
;
49 int ext4fs_devread(lbaint_t sector
, int byte_offset
, int byte_len
, char *buf
)
52 int log2blksz
= ext4fs_block_dev_desc
->log2blksz
;
53 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf
, (ext4fs_block_dev_desc
?
54 ext4fs_block_dev_desc
->blksz
:
56 if (ext4fs_block_dev_desc
== NULL
) {
57 printf("** Invalid Block Device Descriptor (NULL)\n");
61 /* Check partition boundaries */
63 ((sector
+ ((byte_offset
+ byte_len
- 1) >> log2blksz
))
64 >= part_info
->size
)) {
65 printf("%s read outside partition " LBAFU
"\n", __func__
,
70 /* Get the read to the beginning of a partition */
71 sector
+= byte_offset
>> log2blksz
;
72 byte_offset
&= ext4fs_block_dev_desc
->blksz
- 1;
74 debug(" <" LBAFU
", %d, %d>\n", sector
, byte_offset
, byte_len
);
76 if (byte_offset
!= 0) {
78 /* read first part which isn't aligned with start of sector */
79 if (ext4fs_block_dev_desc
->block_read(ext4fs_block_dev_desc
,
80 part_info
->start
+ sector
,
83 printf(" ** ext2fs_devread() read error **\n");
86 readlen
= min((int)ext4fs_block_dev_desc
->blksz
- byte_offset
,
88 memcpy(buf
, sec_buf
+ byte_offset
, readlen
);
97 /* read sector aligned part */
98 block_len
= byte_len
& ~(ext4fs_block_dev_desc
->blksz
- 1);
100 if (block_len
== 0) {
101 ALLOC_CACHE_ALIGN_BUFFER(u8
, p
, ext4fs_block_dev_desc
->blksz
);
103 block_len
= ext4fs_block_dev_desc
->blksz
;
104 ext4fs_block_dev_desc
->block_read(ext4fs_block_dev_desc
,
105 part_info
->start
+ sector
,
107 memcpy(buf
, p
, byte_len
);
111 if (ext4fs_block_dev_desc
->block_read(ext4fs_block_dev_desc
,
112 part_info
->start
+ sector
,
113 block_len
>> log2blksz
,
115 block_len
>> log2blksz
) {
116 printf(" ** %s read error - block\n", __func__
);
119 block_len
= byte_len
& ~(ext4fs_block_dev_desc
->blksz
- 1);
121 byte_len
-= block_len
;
122 sector
+= block_len
/ ext4fs_block_dev_desc
->blksz
;
125 /* read rest of data which are not in whole sector */
126 if (ext4fs_block_dev_desc
->block_read(ext4fs_block_dev_desc
,
127 part_info
->start
+ sector
,
130 printf("* %s read error - last part\n", __func__
);
133 memcpy(buf
, sec_buf
, byte_len
);
138 int ext4_read_superblock(char *buffer
)
140 struct ext_filesystem
*fs
= get_fs();
141 int sect
= SUPERBLOCK_START
>> fs
->dev_desc
->log2blksz
;
142 int off
= SUPERBLOCK_START
% fs
->dev_desc
->blksz
;
144 return ext4fs_devread(sect
, off
, SUPERBLOCK_SIZE
,