Newer
Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/*
* (C) Copyright 2004
* esd gmbh <www.esd-electronics.com>
* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
*
* based on code of fs/reiserfs/dev.c by
*
* (C) Copyright 2003 - 2004
* Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <common.h>
#if (CONFIG_COMMANDS & CFG_CMD_EXT2)
#include <config.h>
#include <ext2fs.h>
static block_dev_desc_t *ext2fs_block_dev_desc;
static disk_partition_t part_info;
#undef DEBUG
int ext2fs_set_blk_dev
(
block_dev_desc_t *rbdd,
int part
)
{
ext2fs_block_dev_desc = rbdd;
if (part == 0)
{
/* disk doesn't use partition table */
part_info.start = 0;
part_info.size = rbdd->lba;
part_info.blksz = rbdd->blksz;
}
else
{
if (get_partition_info (ext2fs_block_dev_desc, part, &part_info))
{
return 0;
}
}
return (part_info.size);
}
int ext2fs_devread
(
int sector,
int byte_offset,
int byte_len,
char *buf
)
{
char sec_buf[SECTOR_SIZE];
unsigned block_len;
/*
* Check partition boundaries
*/
if ((sector < 0) || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >= part_info.size))
{
/* errnum = ERR_OUTSIDE_PART; */
printf (" ** ext2fs_devread() read outside partition sector %d\n", sector);
return(0);
}
/*
* Get the read to the beginning of a partition.
*/
sector += byte_offset >> SECTOR_BITS;
byte_offset &= SECTOR_SIZE - 1;
#if defined(DEBUG)
printf (" <%d, %d, %d>\n", sector, byte_offset, byte_len);
#endif
if (ext2fs_block_dev_desc == NULL)
{
printf("** Invalid Block Device Descriptor (NULL)\n");
return(0);
}
if (byte_offset != 0)
{
/* read first part which isn't aligned with start of sector */
if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev, part_info.start+sector, 1, (unsigned long *)sec_buf) != 1)
{
printf (" ** ext2fs_devread() read error **\n");
return(0);
}
memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len));
buf+=min(SECTOR_SIZE-byte_offset, byte_len);
byte_len-=min(SECTOR_SIZE-byte_offset, byte_len);
sector++;
}
/* read sector aligned part */
block_len = byte_len & ~(SECTOR_SIZE-1);
if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev,
part_info.start+sector,
block_len/SECTOR_SIZE,
(unsigned long *)buf) != block_len/SECTOR_SIZE)
{
printf (" ** ext2fs_devread() read error - block\n");
return(0);
}
buf+=block_len;
byte_len-=block_len;
sector+= block_len/SECTOR_SIZE;
if (byte_len != 0)
{
/* read rest of data which are not in whole sector */
if (ext2fs_block_dev_desc->block_read(ext2fs_block_dev_desc->dev,
part_info.start+sector,
1,
(unsigned long *)sec_buf) != 1)
{
printf (" ** ext2fs_devread() read error - last part\n");
return(0);
}
memcpy(buf, sec_buf, byte_len);
}
return(1);
}
#endif /* CFG_CMD_EXT2FS */