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
|
/* Some of the source code in this file came from "linux/fs/fat/fat.h". */
/*
* 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.
*/
#ifndef _EXFAT_LINUX_H
#define _EXFAT_LINUX_H
#include <linux/buffer_head.h>
#include <linux/string.h>
#include <linux/nls.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/swap.h>
#include "exfat_config.h"
#include "exfat_data.h"
#include "exfat_oal.h"
#include "exfat_blkdev.h"
#include "exfat_cache.h"
#include "exfat_nls.h"
#include "exfat_api.h"
#include "exfat_core.h"
#define EXFAT_ERRORS_CONT 1 /* ignore error and continue */
#define EXFAT_ERRORS_PANIC 2 /* panic on error */
#define EXFAT_ERRORS_RO 3 /* remount r/o on error */
/* ioctl command */
#define EXFAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x12, __u32)
struct exfat_mount_options {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
kuid_t fs_uid;
kgid_t fs_gid;
#else
uid_t fs_uid;
gid_t fs_gid;
#endif
unsigned short fs_fmask;
unsigned short fs_dmask;
unsigned short allow_utime; /* permission for setting the [am]time */
unsigned short codepage; /* codepage for shortname conversions */
char *iocharset; /* charset for filename input/display */
unsigned char casesensitive;
unsigned char errors; /* on error: continue, panic, remount-ro */
#ifdef CONFIG_EXFAT_DISCARD
unsigned char discard; /* flag on if -o dicard specified and device support discard() */
#endif /* CONFIG_EXFAT_DISCARD */
};
#define EXFAT_HASH_BITS 8
#define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS)
/*
* EXFAT file system in-core superblock data
*/
struct exfat_sb_info {
FS_INFO_T fs_info;
BD_INFO_T bd_info;
struct exfat_mount_options options;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
int s_dirt;
struct mutex s_lock;
#endif
struct nls_table *nls_disk; /* Codepage used on disk */
struct nls_table *nls_io; /* Charset used for input and display */
struct inode *fat_inode;
spinlock_t inode_hash_lock;
struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];
#ifdef CONFIG_EXFAT_KERNEL_DEBUG
long debug_flags;
#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
};
/*
* EXFAT file system inode data in memory
*/
struct exfat_inode_info {
FILE_ID_T fid;
char *target;
/* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
loff_t mmu_private; /* physically allocated size */
loff_t i_pos; /* on-disk position of directory entry or 0 */
struct hlist_node i_hash_fat; /* hash by i_location */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00)
struct rw_semaphore truncate_lock;
#endif
struct inode vfs_inode;
struct rw_semaphore i_alloc_sem; /* protect bmap against truncate */
};
#define EXFAT_SB(sb) ((struct exfat_sb_info *)((sb)->s_fs_info))
static inline struct exfat_inode_info *EXFAT_I(struct inode *inode)
{
return container_of(inode, struct exfat_inode_info, vfs_inode);
}
/*
* If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
* save ATTR_RO instead of ->i_mode.
*
* If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
* bit, it's just used as flag for app.
*/
static inline int exfat_mode_can_hold_ro(struct inode *inode)
{
struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
if (S_ISDIR(inode->i_mode))
return 0;
if ((~sbi->options.fs_fmask) & S_IWUGO)
return 1;
return 0;
}
/* Convert attribute bits and a mask to the UNIX mode. */
static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi,
u32 attr, mode_t mode)
{
if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR))
mode &= ~S_IWUGO;
if (attr & ATTR_SUBDIR)
return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
else if (attr & ATTR_SYMLINK)
return (mode & ~sbi->options.fs_dmask) | S_IFLNK;
else
return (mode & ~sbi->options.fs_fmask) | S_IFREG;
}
/* Return the FAT attribute byte for this inode */
static inline u32 exfat_make_attr(struct inode *inode)
{
if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
return (EXFAT_I(inode)->fid.attr) | ATTR_READONLY;
else
return EXFAT_I(inode)->fid.attr;
}
static inline void exfat_save_attr(struct inode *inode, u32 attr)
{
if (exfat_mode_can_hold_ro(inode))
EXFAT_I(inode)->fid.attr = attr & ATTR_RWMASK;
else
EXFAT_I(inode)->fid.attr = attr & (ATTR_RWMASK | ATTR_READONLY);
}
#endif /* _EXFAT_LINUX_H */
|
