1 /* Some of the source code in this file came from "linux/fs/fat/fat.h". */
4 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 #ifndef _EXFAT_LINUX_H
22 #define _EXFAT_LINUX_H
24 #include <linux/buffer_head.h>
25 #include <linux/string.h>
26 #include <linux/nls.h>
28 #include <linux/mutex.h>
29 #include <linux/swap.h>
31 #include "exfat_config.h"
32 #include "exfat_global.h"
33 #include "exfat_data.h"
34 #include "exfat_oal.h"
36 #include "exfat_blkdev.h"
37 #include "exfat_cache.h"
38 #include "exfat_part.h"
39 #include "exfat_nls.h"
40 #include "exfat_api.h"
43 #define EXFAT_ERRORS_CONT 1 /* ignore error and continue */
44 #define EXFAT_ERRORS_PANIC 2 /* panic on error */
45 #define EXFAT_ERRORS_RO 3 /* remount r/o on error */
48 #define EXFAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x12, __u32)
50 struct exfat_mount_options
{
51 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
58 unsigned short fs_fmask
;
59 unsigned short fs_dmask
;
60 unsigned short allow_utime
; /* permission for setting the [am]time */
61 unsigned short codepage
; /* codepage for shortname conversions */
62 char *iocharset
; /* charset for filename input/display */
63 unsigned char casesensitive
;
64 unsigned char errors
; /* on error: continue, panic, remount-ro */
65 #if EXFAT_CONFIG_DISCARD
66 unsigned char discard
; /* flag on if -o dicard specified and device support discard() */
67 #endif /* EXFAT_CONFIG_DISCARD */
70 #define EXFAT_HASH_BITS 8
71 #define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS)
74 * EXFAT file system in-core superblock data
76 struct exfat_sb_info
{
80 struct exfat_mount_options options
;
82 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
86 struct nls_table
*nls_disk
; /* Codepage used on disk */
87 struct nls_table
*nls_io
; /* Charset used for input and display */
89 struct inode
*fat_inode
;
91 spinlock_t inode_hash_lock
;
92 struct hlist_head inode_hashtable
[EXFAT_HASH_SIZE
];
93 #if EXFAT_CONFIG_KERNEL_DEBUG
95 #endif /* EXFAT_CONFIG_KERNEL_DEBUG */
99 * EXFAT file system inode data in memory
101 struct exfat_inode_info
{
104 /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
105 loff_t mmu_private
; /* physically allocated size */
106 loff_t i_pos
; /* on-disk position of directory entry or 0 */
107 struct hlist_node i_hash_fat
; /* hash by i_location */
108 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00)
109 struct rw_semaphore truncate_lock
;
111 struct inode vfs_inode
;
112 struct rw_semaphore i_alloc_sem
; /* protect bmap against truncate */
115 #define EXFAT_SB(sb) ((struct exfat_sb_info *)((sb)->s_fs_info))
117 static inline struct exfat_inode_info
*EXFAT_I(struct inode
*inode
) {
118 return container_of(inode
, struct exfat_inode_info
, vfs_inode
);
122 * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
123 * save ATTR_RO instead of ->i_mode.
125 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
126 * bit, it's just used as flag for app.
128 static inline int exfat_mode_can_hold_ro(struct inode
*inode
)
130 struct exfat_sb_info
*sbi
= EXFAT_SB(inode
->i_sb
);
132 if (S_ISDIR(inode
->i_mode
))
135 if ((~sbi
->options
.fs_fmask
) & S_IWUGO
)
140 /* Convert attribute bits and a mask to the UNIX mode. */
141 static inline mode_t
exfat_make_mode(struct exfat_sb_info
*sbi
,
142 u32 attr
, mode_t mode
)
144 if ((attr
& ATTR_READONLY
) && !(attr
& ATTR_SUBDIR
))
147 if (attr
& ATTR_SUBDIR
)
148 return (mode
& ~sbi
->options
.fs_dmask
) | S_IFDIR
;
149 else if (attr
& ATTR_SYMLINK
)
150 return (mode
& ~sbi
->options
.fs_dmask
) | S_IFLNK
;
152 return (mode
& ~sbi
->options
.fs_fmask
) | S_IFREG
;
155 /* Return the FAT attribute byte for this inode */
156 static inline u32
exfat_make_attr(struct inode
*inode
)
158 if (exfat_mode_can_hold_ro(inode
) && !(inode
->i_mode
& S_IWUGO
))
159 return ((EXFAT_I(inode
)->fid
.attr
) | ATTR_READONLY
);
161 return (EXFAT_I(inode
)->fid
.attr
);
164 static inline void exfat_save_attr(struct inode
*inode
, u32 attr
)
166 if (exfat_mode_can_hold_ro(inode
))
167 EXFAT_I(inode
)->fid
.attr
= attr
& ATTR_RWMASK
;
169 EXFAT_I(inode
)->fid
.attr
= attr
& (ATTR_RWMASK
| ATTR_READONLY
);
172 #endif /* _EXFAT_LINUX_H */