]>
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.
29 #include <ext_common.h>
30 #include "ext4_common.h"
34 static block_dev_desc_t
*ext4fs_block_dev_desc
;
35 static disk_partition_t
*part_info
;
37 void ext4fs_set_blk_dev(block_dev_desc_t
*rbdd
, disk_partition_t
*info
)
39 assert(rbdd
->blksz
== (1 << rbdd
->log2blksz
));
40 ext4fs_block_dev_desc
= rbdd
;
41 get_fs()->dev_desc
= rbdd
;
43 part_offset
= info
->start
;
44 get_fs()->total_sect
= ((uint64_t)info
->size
* info
->blksz
) >>
45 get_fs()->dev_desc
->log2blksz
;
48 int ext4fs_devread(lbaint_t sector
, int byte_offset
, int byte_len
, char *buf
)
51 int log2blksz
= ext4fs_block_dev_desc
->log2blksz
;
52 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf
, (ext4fs_block_dev_desc
?
53 ext4fs_block_dev_desc
->blksz
:
55 if (ext4fs_block_dev_desc
== NULL
) {
56 printf("** Invalid Block Device Descriptor (NULL)\n");
60 /* Check partition boundaries */
62 ((sector
+ ((byte_offset
+ byte_len
- 1) >> log2blksz
))
63 >= part_info
->size
)) {
64 printf("%s read outside partition " LBAFU
"\n", __func__
,
69 /* Get the read to the beginning of a partition */
70 sector
+= byte_offset
>> log2blksz
;
71 byte_offset
&= ext4fs_block_dev_desc
->blksz
- 1;
73 debug(" <" LBAFU
", %d, %d>\n", sector
, byte_offset
, byte_len
);
75 if (byte_offset
!= 0) {
77 /* read first part which isn't aligned with start of sector */
78 if (ext4fs_block_dev_desc
->
79 block_read(ext4fs_block_dev_desc
->dev
,
80 part_info
->start
+ sector
, 1,
81 (unsigned long *) sec_buf
) != 1) {
82 printf(" ** ext2fs_devread() read error **\n");
85 readlen
= min((int)ext4fs_block_dev_desc
->blksz
- byte_offset
,
87 memcpy(buf
, sec_buf
+ byte_offset
, readlen
);
96 /* read sector aligned part */
97 block_len
= byte_len
& ~(ext4fs_block_dev_desc
->blksz
- 1);
100 ALLOC_CACHE_ALIGN_BUFFER(u8
, p
, ext4fs_block_dev_desc
->blksz
);
102 block_len
= ext4fs_block_dev_desc
->blksz
;
103 ext4fs_block_dev_desc
->block_read(ext4fs_block_dev_desc
->dev
,
104 part_info
->start
+ sector
,
105 1, (unsigned long *)p
);
106 memcpy(buf
, p
, byte_len
);
110 if (ext4fs_block_dev_desc
->block_read(ext4fs_block_dev_desc
->dev
,
111 part_info
->start
+ sector
,
112 block_len
>> log2blksz
,
113 (unsigned long *) buf
) !=
114 block_len
>> log2blksz
) {
115 printf(" ** %s read error - block\n", __func__
);
118 block_len
= byte_len
& ~(ext4fs_block_dev_desc
->blksz
- 1);
120 byte_len
-= block_len
;
121 sector
+= block_len
/ ext4fs_block_dev_desc
->blksz
;
124 /* read rest of data which are not in whole sector */
125 if (ext4fs_block_dev_desc
->
126 block_read(ext4fs_block_dev_desc
->dev
,
127 part_info
->start
+ sector
, 1,
128 (unsigned long *) sec_buf
) != 1) {
129 printf("* %s read error - last part\n", __func__
);
132 memcpy(buf
, sec_buf
, byte_len
);
137 int ext4_read_superblock(char *buffer
)
139 struct ext_filesystem
*fs
= get_fs();
140 int sect
= SUPERBLOCK_START
>> fs
->dev_desc
->log2blksz
;
141 int off
= SUPERBLOCK_START
% fs
->dev_desc
->blksz
;
143 return ext4fs_devread(sect
, off
, SUPERBLOCK_SIZE
,