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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : exfat_blkdev.c */
/* PURPOSE : exFAT Block Device Driver Glue Layer */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/*----------------------------------------------------------------------*/
/* REVISION HISTORY (Ver 0.9) */
/* */
/* - 2010.11.15 [Joosun Hahn] : first writing */
/* */
/************************************************************************/
#include <linux/blkdev.h>
#include "exfat_config.h"
#include "exfat_global.h"
#include "exfat_blkdev.h"
#include "exfat_data.h"
#include "exfat_api.h"
#include "exfat_super.h"
/*----------------------------------------------------------------------*/
/* Constant & Macro Definitions */
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
/* Global Variable Definitions */
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
/* Local Variable Definitions */
/*----------------------------------------------------------------------*/
/*======================================================================*/
/* Function Definitions */
/*======================================================================*/
INT32 bdev_init(void)
{
return(FFS_SUCCESS);
}
INT32 bdev_shutdown(void)
{
return(FFS_SUCCESS);
}
INT32 bdev_open(struct super_block *sb)
{
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
if (p_bd->opened) return(FFS_SUCCESS);
p_bd->sector_size = bdev_logical_block_size(sb->s_bdev);
p_bd->sector_size_bits = my_log2(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;
return(FFS_SUCCESS);
}
INT32 bdev_close(struct super_block *sb)
{
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
if (!p_bd->opened) return(FFS_SUCCESS);
p_bd->opened = FALSE;
return(FFS_SUCCESS);
}
INT32 bdev_read(struct super_block *sb, UINT32 secno, struct buffer_head **bh, UINT32 num_secs, INT32 read)
{
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
#if EXFAT_CONFIG_KERNEL_DEBUG
struct exfat_sb_info *sbi = EXFAT_SB(sb);
long flags = sbi->debug_flags;
if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) return (FFS_MEDIAERR);
#endif /* EXFAT_CONFIG_KERNEL_DEBUG */
if (!p_bd->opened) return(FFS_MEDIAERR);
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(FFS_SUCCESS);
WARN(!p_fs->dev_ejected,
"[EXFAT] No bh, device seems wrong or to be ejected.\n");
return(FFS_MEDIAERR);
}
INT32 bdev_write(struct super_block *sb, UINT32 secno, struct buffer_head *bh, UINT32 num_secs, INT32 sync)
{
INT32 count;
struct buffer_head *bh2;
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
#if EXFAT_CONFIG_KERNEL_DEBUG
struct exfat_sb_info *sbi = EXFAT_SB(sb);
long flags = sbi->debug_flags;
if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) return (FFS_MEDIAERR);
#endif /* EXFAT_CONFIG_KERNEL_DEBUG */
if (!p_bd->opened) return(FFS_MEDIAERR);
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 (FFS_MEDIAERR);
} else {
count = num_secs << p_bd->sector_size_bits;
bh2 = __getblk(sb->s_bdev, secno, count);
if (bh2 == NULL)
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(FFS_SUCCESS);
no_bh:
WARN(!p_fs->dev_ejected,
"[EXFAT] No bh, device seems wrong or to be ejected.\n");
return (FFS_MEDIAERR);
}
INT32 bdev_sync(struct super_block *sb)
{
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
#if EXFAT_CONFIG_KERNEL_DEBUG
struct exfat_sb_info *sbi = EXFAT_SB(sb);
long flags = sbi->debug_flags;
if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) return (FFS_MEDIAERR);
#endif /* EXFAT_CONFIG_KERNEL_DEBUG */
if (!p_bd->opened) return(FFS_MEDIAERR);
return sync_blockdev(sb->s_bdev);
}
/* end of exfat_blkdev.c */
|
