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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*/
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include "exfat.h"
void exfat_bdev_open(struct super_block *sb)
{
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
if (p_bd->opened)
return;
p_bd->sector_size = bdev_logical_block_size(sb->s_bdev);
p_bd->sector_size_bits = ilog2(p_bd->sector_size);
p_bd->sector_size_mask = p_bd->sector_size - 1;
p_bd->num_sectors = i_size_read(sb->s_bdev->bd_inode) >>
p_bd->sector_size_bits;
p_bd->opened = true;
}
void exfat_bdev_close(struct super_block *sb)
{
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
p_bd->opened = false;
}
int exfat_bdev_read(struct super_block *sb, sector_t secno, struct buffer_head **bh,
u32 num_secs, bool read)
{
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
#ifdef CONFIG_EXFAT_KERNEL_DEBUG
struct exfat_sb_info *sbi = EXFAT_SB(sb);
long flags = sbi->debug_flags;
if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
return -EIO;
#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
if (!p_bd->opened)
return -ENODEV;
if (*bh)
__brelse(*bh);
if (read)
*bh = __bread(sb->s_bdev, secno,
num_secs << p_bd->sector_size_bits);
else
*bh = __getblk(sb->s_bdev, secno,
num_secs << p_bd->sector_size_bits);
if (*bh)
return 0;
WARN(!p_fs->dev_ejected,
"[EXFAT] No bh, device seems wrong or to be ejected.\n");
return -EIO;
}
int exfat_bdev_write(struct super_block *sb, sector_t secno, struct buffer_head *bh,
u32 num_secs, bool sync)
{
s32 count;
struct buffer_head *bh2;
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
#ifdef CONFIG_EXFAT_KERNEL_DEBUG
struct exfat_sb_info *sbi = EXFAT_SB(sb);
long flags = sbi->debug_flags;
if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
return -EIO;
#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
if (!p_bd->opened)
return -ENODEV;
if (secno == bh->b_blocknr) {
lock_buffer(bh);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
unlock_buffer(bh);
if (sync && (sync_dirty_buffer(bh) != 0))
return -EIO;
} else {
count = num_secs << p_bd->sector_size_bits;
bh2 = __getblk(sb->s_bdev, secno, count);
if (!bh2)
goto no_bh;
lock_buffer(bh2);
memcpy(bh2->b_data, bh->b_data, count);
set_buffer_uptodate(bh2);
mark_buffer_dirty(bh2);
unlock_buffer(bh2);
if (sync && (sync_dirty_buffer(bh2) != 0)) {
__brelse(bh2);
goto no_bh;
}
__brelse(bh2);
}
return 0;
no_bh:
WARN(!p_fs->dev_ejected,
"[EXFAT] No bh, device seems wrong or to be ejected.\n");
return -EIO;
}
int exfat_bdev_sync(struct super_block *sb)
{
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
#ifdef CONFIG_EXFAT_KERNEL_DEBUG
struct exfat_sb_info *sbi = EXFAT_SB(sb);
long flags = sbi->debug_flags;
if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
return -EIO;
#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
if (!p_bd->opened)
return -ENODEV;
return sync_blockdev(sb->s_bdev);
}
|
