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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
|
#ifndef _LINUX_MSDOS_FS_H
#define _LINUX_MSDOS_FS_H
/*
* The MS-DOS filesystem constants/structures
*/
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/fd.h>
#include <asm/byteorder.h>
#define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */
#define SECTOR_SIZE 512 /* sector size (bytes) */
#define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */
#define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */
#define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */
#define MSDOS_DPS (SECTOR_SIZE/sizeof(struct msdos_dir_entry))
#define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */
#define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */
#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
#define FAT_CACHE 8 /* FAT cache size */
#define MSDOS_MAX_EXTRA 3 /* tolerate up to that number of clusters which are
inaccessible because the FAT is too short */
#define ATTR_RO 1 /* read-only */
#define ATTR_HIDDEN 2 /* hidden */
#define ATTR_SYS 4 /* system */
#define ATTR_VOLUME 8 /* volume label */
#define ATTR_DIR 16 /* directory */
#define ATTR_ARCH 32 /* archived */
#define ATTR_NONE 0 /* no attribute bits */
#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
/* attribute bits that are copied "as is" */
#define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
/* bits that are used by the Windows 95/Windows NT extended FAT */
#define ATTR_DIR_READ_BOTH 512 /* read both short and long names from the
* vfat filesystem. This is used by Samba
* to export the vfat filesystem with correct
* shortnames. */
#define ATTR_DIR_READ_SHORT 1024
#define CASE_LOWER_BASE 8 /* base is lower case */
#define CASE_LOWER_EXT 16 /* extension is lower case */
#define SCAN_ANY 0 /* either hidden or not */
#define SCAN_HID 1 /* only hidden */
#define SCAN_NOTHID 2 /* only not hidden */
#define SCAN_NOTANY 3 /* test name, then use SCAN_HID or SCAN_NOTHID */
#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
#define IS_FREE(n) (!*(n) || *(const unsigned char *) (n) == DELETED_FLAG)
#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
/* valid file mode bits */
#define MSDOS_SB(s) (&((s)->u.msdos_sb))
#define MSDOS_I(i) (&((i)->u.msdos_i))
#define MSDOS_NAME 11 /* maximum name length */
#define MSDOS_LONGNAME 256 /* maximum name length */
#define MSDOS_SLOTS 21 /* max # of slots needed for short and long names */
#define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */
#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
#define MSDOS_FAT12 4084 /* maximum number of clusters in a 12 bit FAT */
#define EOF_FAT12 0xFF8 /* standard EOF */
#define EOF_FAT16 0xFFF8
#define EOF_FAT32 0xFFFFFF8
#define EOF_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? EOF_FAT32 : \
MSDOS_SB(s)->fat_bits == 16 ? EOF_FAT16 : EOF_FAT12)
#define FAT_FSINFO_SIG1 0x41615252
#define FAT_FSINFO_SIG2 0x61417272
#define IS_FSINFO(x) (CF_LE_L((x)->signature1) == FAT_FSINFO_SIG1 \
&& CF_LE_L((x)->signature2) == FAT_FSINFO_SIG2)
/*
* Inode flags
*/
#define FAT_BINARY_FL 0x00000001 /* File contains binary data */
/*
* ioctl commands
*/
#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2])
#define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct dirent [2])
/*
* vfat shortname flags
*/
#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
#define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
#define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
/*
* Conversion from and to little-endian byte order. (no-op on i386/i486)
*
* Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian,
* BE = big-endian, c: W = word (16 bits), L = longword (32 bits)
*/
#define CF_LE_W(v) le16_to_cpu(v)
#define CF_LE_L(v) le32_to_cpu(v)
#define CT_LE_W(v) cpu_to_le16(v)
#define CT_LE_L(v) cpu_to_le32(v)
struct fat_boot_sector {
__s8 ignored[3]; /* Boot strap short or near jump */
__s8 system_id[8]; /* Name - can be used to special case
partition manager volumes */
__u8 sector_size[2]; /* bytes per logical sector */
__u8 cluster_size; /* sectors/cluster */
__u16 reserved; /* reserved sectors */
__u8 fats; /* number of FATs */
__u8 dir_entries[2]; /* root directory entries */
__u8 sectors[2]; /* number of sectors */
__u8 media; /* media code (unused) */
__u16 fat_length; /* sectors/FAT */
__u16 secs_track; /* sectors per track */
__u16 heads; /* number of heads */
__u32 hidden; /* hidden sectors (unused) */
__u32 total_sect; /* number of sectors (if sectors == 0) */
/* The following fields are only used by FAT32 */
__u32 fat32_length; /* sectors/FAT */
__u16 flags; /* bit 8: fat mirroring, low 4: active fat */
__u8 version[2]; /* major, minor filesystem version */
__u32 root_cluster; /* first cluster in root directory */
__u16 info_sector; /* filesystem info sector */
__u16 backup_boot; /* backup boot sector */
__u16 reserved2[6]; /* Unused */
};
struct fat_boot_fsinfo {
__u32 signature1; /* 0x41615252L */
__u32 reserved1[120]; /* Nothing as far as I can tell */
__u32 signature2; /* 0x61417272L */
__u32 free_clusters; /* Free cluster count. -1 if unknown */
__u32 next_cluster; /* Most recently allocated cluster.
* Unused under Linux. */
__u32 reserved2[4];
};
struct msdos_dir_entry {
__s8 name[8],ext[3]; /* name and extension */
__u8 attr; /* attribute bits */
__u8 lcase; /* Case for base and extension */
__u8 ctime_ms; /* Creation time, milliseconds */
__u16 ctime; /* Creation time */
__u16 cdate; /* Creation date */
__u16 adate; /* Last access date */
__u16 starthi; /* High 16 bits of cluster in FAT32 */
__u16 time,date,start;/* time, date and first cluster */
__u32 size; /* file size (in bytes) */
};
/* Up to 13 characters of the name */
struct msdos_dir_slot {
__u8 id; /* sequence number for slot */
__u8 name0_4[10]; /* first 5 characters in name */
__u8 attr; /* attribute byte */
__u8 reserved; /* always 0 */
__u8 alias_checksum; /* checksum for 8.3 alias */
__u8 name5_10[12]; /* 6 more characters in name */
__u16 start; /* starting cluster number, 0 in long slots */
__u8 name11_12[4]; /* last 2 characters in name */
};
struct vfat_slot_info {
int is_long; /* was the found entry long */
int long_slots; /* number of long slots in filename */
int total_slots; /* total slots (long and short) */
loff_t longname_offset; /* dir offset for longname start */
loff_t shortname_offset; /* dir offset for shortname start */
int ino; /* ino for the file */
};
/* Determine whether this FS has kB-aligned data. */
#define MSDOS_CAN_BMAP(mib) (!(((mib)->cluster_size & 1) || \
((mib)->data_start & 1)))
/* Convert attribute bits and a mask to the UNIX mode. */
#define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
/* Convert the UNIX mode to MS-DOS attribute bits. */
#define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
#ifdef __KERNEL__
#include <linux/nls.h>
struct fat_cache {
kdev_t device; /* device number. 0 means unused. */
int start_cluster; /* first cluster of the chain. */
int file_cluster; /* cluster number in the file. */
int disk_cluster; /* cluster number on disk. */
struct fat_cache *next; /* next cache entry */
};
static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
{
#ifdef __BIG_ENDIAN
while (len--) {
*dst++ = src[0] | (src[1] << 8);
src += 2;
}
#else
memcpy(dst, src, len * 2);
#endif
}
static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
{
#ifdef __BIG_ENDIAN
while (len--) {
dst[0] = *src & 0x00FF;
dst[1] = (*src & 0xFF00) >> 8;
dst += 2;
src++;
}
#else
memcpy(dst, src, len * 2);
#endif
}
/* fat/buffer.c */
extern struct buffer_head *fat_bread(struct super_block *sb, int block);
extern struct buffer_head *fat_getblk(struct super_block *sb, int block);
extern void fat_brelse(struct super_block *sb, struct buffer_head *bh);
extern void fat_mark_buffer_dirty(struct super_block *sb, struct buffer_head *bh);
extern void fat_set_uptodate(struct super_block *sb, struct buffer_head *bh,
int val);
extern int fat_is_uptodate(struct super_block *sb, struct buffer_head *bh);
extern void fat_ll_rw_block(struct super_block *sb, int opr, int nbreq,
struct buffer_head *bh[32]);
/* fat/cache.c */
extern int fat_access(struct super_block *sb, int nr, int new_value);
extern int fat_bmap(struct inode *inode, int sector);
extern void fat_cache_init(void);
extern void fat_cache_lookup(struct inode *inode, int cluster, int *f_clu,
int *d_clu);
extern void fat_cache_add(struct inode *inode, int f_clu, int d_clu);
extern void fat_cache_inval_inode(struct inode *inode);
extern void fat_cache_inval_dev(kdev_t device);
extern int fat_get_cluster(struct inode *inode, int cluster);
extern int fat_free(struct inode *inode, int skip);
/* fat/dir.c */
extern struct file_operations fat_dir_operations;
extern int fat_search_long(struct inode *inode, const char *name, int name_len,
int anycase, loff_t *spos, loff_t *lpos);
extern int fat_readdir(struct file *filp, void *dirent, filldir_t filldir);
extern int fat_dir_ioctl(struct inode * inode, struct file * filp,
unsigned int cmd, unsigned long arg);
extern int fat_dir_empty(struct inode *dir);
extern int fat_add_entries(struct inode *dir, int slots, struct buffer_head **bh,
struct msdos_dir_entry **de, int *ino);
extern int fat_new_dir(struct inode *dir, struct inode *parent, int is_vfat);
/* fat/file.c */
extern struct file_operations fat_file_operations;
extern struct inode_operations fat_file_inode_operations;
extern ssize_t fat_file_read(struct file *filp, char *buf, size_t count,
loff_t *ppos);
extern int fat_get_block(struct inode *inode, long iblock,
struct buffer_head *bh_result, int create);
extern ssize_t fat_file_write(struct file *filp, const char *buf, size_t count,
loff_t *ppos);
extern void fat_truncate(struct inode *inode);
/* fat/inode.c */
extern void fat_hash_init(void);
extern void fat_attach(struct inode *inode, int i_pos);
extern void fat_detach(struct inode *inode);
extern struct inode *fat_iget(struct super_block *sb, int i_pos);
extern struct inode *fat_build_inode(struct super_block *sb,
struct msdos_dir_entry *de, int ino, int *res);
extern void fat_delete_inode(struct inode *inode);
extern void fat_clear_inode(struct inode *inode);
extern void fat_put_super(struct super_block *sb);
extern struct super_block *
fat_read_super(struct super_block *sb, void *data, int silent,
struct inode_operations *fs_dir_inode_ops);
extern int fat_statfs(struct super_block *sb, struct statfs *buf);
extern void fat_write_inode(struct inode *inode, int wait);
extern int fat_notify_change(struct dentry * dentry, struct iattr * attr);
/* fat/misc.c */
extern void fat_fs_panic(struct super_block *s, const char *msg);
extern int fat_is_binary(char conversion, char *extension);
extern void lock_fat(struct super_block *sb);
extern void unlock_fat(struct super_block *sb);
extern void fat_clusters_flush(struct super_block *sb);
extern int fat_add_cluster(struct inode *inode);
extern struct buffer_head *fat_extend_dir(struct inode *inode);
extern int date_dos2unix(unsigned short time, unsigned short date);
extern void fat_date_unix2dos(int unix_date, unsigned short *time,
unsigned short *date);
extern int fat__get_entry(struct inode *dir, loff_t *pos, struct buffer_head **bh,
struct msdos_dir_entry **de, int *ino);
static __inline__ int fat_get_entry(struct inode *dir, loff_t *pos,
struct buffer_head **bh,
struct msdos_dir_entry **de, int *ino)
{
/* Fast stuff first */
if (*bh && *de &&
(*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
*pos += sizeof(struct msdos_dir_entry);
(*de)++;
(*ino)++;
return 0;
}
return fat__get_entry(dir,pos,bh,de,ino);
}
extern int fat_subdirs(struct inode *dir);
extern int fat_scan(struct inode *dir, const char *name,
struct buffer_head **res_bh,
struct msdos_dir_entry **res_de, int *ino);
/* msdos/namei.c - these are for Umsdos */
extern void msdos_put_super(struct super_block *sb);
extern struct dentry *msdos_lookup(struct inode *dir, struct dentry *);
extern int msdos_create(struct inode *dir, struct dentry *dentry, int mode);
extern int msdos_rmdir(struct inode *dir, struct dentry *dentry);
extern int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode);
extern int msdos_unlink(struct inode *dir, struct dentry *dentry);
extern int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
extern struct super_block *msdos_read_super(struct super_block *sb,
void *data, int silent);
/* vfat/namei.c - these are for dmsdos */
extern struct dentry *vfat_lookup(struct inode *dir, struct dentry *);
extern int vfat_create(struct inode *dir, struct dentry *dentry, int mode);
extern int vfat_rmdir(struct inode *dir, struct dentry *dentry);
extern int vfat_unlink(struct inode *dir, struct dentry *dentry);
extern int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode);
extern int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
extern struct super_block *vfat_read_super(struct super_block *sb, void *data,
int silent);
/* vfat/vfatfs_syms.c */
extern struct file_system_type vfat_fs_type;
#endif /* __KERNEL__ */
#endif
|
