1 #ifndef _LINUX_MSDOS_FS_H
2 #define _LINUX_MSDOS_FS_H
5 * The MS-DOS filesystem constants/structures
7 #include <linux/buffer_head.h>
8 #include <linux/string.h>
9 #include <asm/byteorder.h>
14 #define SECTOR_SIZE 512 /* sector size (bytes) */
15 #define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */
16 #define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */
17 #define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */
18 #define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
19 #define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */
21 #define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */
22 #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */
25 #define FAT_MAX_DIR_ENTRIES (65536)
26 #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)
28 #define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
30 #define ATTR_NONE 0 /* no attribute bits */
31 #define ATTR_RO 1 /* read-only */
32 #define ATTR_HIDDEN 2 /* hidden */
33 #define ATTR_SYS 4 /* system */
34 #define ATTR_VOLUME 8 /* volume label */
35 #define ATTR_DIR 16 /* directory */
36 #define ATTR_ARCH 32 /* archived */
38 #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
39 /* attribute bits that are copied "as is" */
40 #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
41 /* bits that are used by the Windows 95/Windows NT extended FAT */
43 #define CASE_LOWER_BASE 8 /* base is lower case */
44 #define CASE_LOWER_EXT 16 /* extension is lower case */
46 #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
47 #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
49 #define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
50 /* valid file mode bits */
52 #define MSDOS_NAME 11 /* maximum name length */
53 #define MSDOS_LONGNAME 256 /* maximum name length */
54 #define MSDOS_SLOTS 21 /* max # of slots needed for short and long names */
55 #define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */
56 #define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
58 #define MSDOS_FAT12 4084 /* maximum number of clusters in a 12 bit FAT */
60 /* media of boot sector */
61 #define FAT_VALID_MEDIA(x) ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0)
62 #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
63 MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))
65 /* bad cluster mark */
66 #define BAD_FAT12 0xFF7
67 #define BAD_FAT16 0xFFF7
68 #define BAD_FAT32 0xFFFFFF7
69 #define BAD_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? BAD_FAT32 : \
70 MSDOS_SB(s)->fat_bits == 16 ? BAD_FAT16 : BAD_FAT12)
73 #define EOF_FAT12 0xFFF
74 #define EOF_FAT16 0xFFFF
75 #define EOF_FAT32 0xFFFFFFF
76 #define EOF_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? EOF_FAT32 : \
77 MSDOS_SB(s)->fat_bits == 16 ? EOF_FAT16 : EOF_FAT12)
79 #define FAT_ENT_FREE (0)
80 #define FAT_ENT_BAD (BAD_FAT32)
81 #define FAT_ENT_EOF (EOF_FAT32)
83 #define FAT_FSINFO_SIG1 0x41615252
84 #define FAT_FSINFO_SIG2 0x61417272
85 #define IS_FSINFO(x) (CF_LE_L((x)->signature1) == FAT_FSINFO_SIG1 \
86 && CF_LE_L((x)->signature2) == FAT_FSINFO_SIG2)
91 #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2])
92 #define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct dirent [2])
95 * vfat shortname flags
97 #define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
98 #define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
99 #define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
100 #define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
101 #define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
104 * Conversion from and to little-endian byte order. (no-op on i386/i486)
106 * Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian,
107 * BE = big-endian, c: W = word (16 bits), L = longword (32 bits)
110 #define CF_LE_W(v) le16_to_cpu(v)
111 #define CF_LE_L(v) le32_to_cpu(v)
112 #define CT_LE_W(v) cpu_to_le16(v)
113 #define CT_LE_L(v) cpu_to_le32(v)
115 struct fat_boot_sector {
116 __u8 ignored[3]; /* Boot strap short or near jump */
117 __u8 system_id[8]; /* Name - can be used to special case
118 partition manager volumes */
119 __u8 sector_size[2]; /* bytes per logical sector */
120 __u8 sec_per_clus; /* sectors/cluster */
121 __u16 reserved; /* reserved sectors */
122 __u8 fats; /* number of FATs */
123 __u8 dir_entries[2]; /* root directory entries */
124 __u8 sectors[2]; /* number of sectors */
125 __u8 media; /* media code */
126 __u16 fat_length; /* sectors/FAT */
127 __u16 secs_track; /* sectors per track */
128 __u16 heads; /* number of heads */
129 __u32 hidden; /* hidden sectors (unused) */
130 __u32 total_sect; /* number of sectors (if sectors == 0) */
132 /* The following fields are only used by FAT32 */
133 __u32 fat32_length; /* sectors/FAT */
134 __u16 flags; /* bit 8: fat mirroring, low 4: active fat */
135 __u8 version[2]; /* major, minor filesystem version */
136 __u32 root_cluster; /* first cluster in root directory */
137 __u16 info_sector; /* filesystem info sector */
138 __u16 backup_boot; /* backup boot sector */
139 __u16 reserved2[6]; /* Unused */
142 struct fat_boot_fsinfo {
143 __u32 signature1; /* 0x41615252L */
144 __u32 reserved1[120]; /* Nothing as far as I can tell */
145 __u32 signature2; /* 0x61417272L */
146 __u32 free_clusters; /* Free cluster count. -1 if unknown */
147 __u32 next_cluster; /* Most recently allocated cluster */
151 struct msdos_dir_entry {
152 __u8 name[8],ext[3]; /* name and extension */
153 __u8 attr; /* attribute bits */
154 __u8 lcase; /* Case for base and extension */
155 __u8 ctime_ms; /* Creation time, milliseconds */
156 __u16 ctime; /* Creation time */
157 __u16 cdate; /* Creation date */
158 __u16 adate; /* Last access date */
159 __u16 starthi; /* High 16 bits of cluster in FAT32 */
160 __u16 time,date,start;/* time, date and first cluster */
161 __u32 size; /* file size (in bytes) */
164 /* Up to 13 characters of the name */
165 struct msdos_dir_slot {
166 __u8 id; /* sequence number for slot */
167 __u8 name0_4[10]; /* first 5 characters in name */
168 __u8 attr; /* attribute byte */
169 __u8 reserved; /* always 0 */
170 __u8 alias_checksum; /* checksum for 8.3 alias */
171 __u8 name5_10[12]; /* 6 more characters in name */
172 __u16 start; /* starting cluster number, 0 in long slots */
173 __u8 name11_12[4]; /* last 2 characters in name */
176 struct vfat_slot_info {
177 int long_slots; /* number of long slots in filename */
178 loff_t longname_offset; /* dir offset for longname start */
179 loff_t i_pos; /* on-disk position of directory entry */
182 /* Convert attribute bits and a mask to the UNIX mode. */
183 #define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
185 /* Convert the UNIX mode to MS-DOS attribute bits. */
186 #define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
191 #include <linux/nls.h>
192 #include <linux/msdos_fs_i.h>
193 #include <linux/msdos_fs_sb.h>
195 static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
197 return sb->s_fs_info;
200 static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
202 return container_of(inode, struct msdos_inode_info, vfs_inode);
205 static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
209 *dst++ = src[0] | (src[1] << 8);
213 memcpy(dst, src, len * 2);
217 static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
221 dst[0] = *src & 0x00FF;
222 dst[1] = (*src & 0xFF00) >> 8;
227 memcpy(dst, src, len * 2);
232 extern int fat_access(struct super_block *sb, int nr, int new_value);
233 extern int __fat_access(struct super_block *sb, int nr, int new_value);
234 extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys);
235 extern void fat_cache_init(struct super_block *sb);
236 extern void fat_cache_lookup(struct inode *inode, int cluster, int *f_clu,
238 extern void fat_cache_add(struct inode *inode, int f_clu, int d_clu);
239 extern void fat_cache_inval_inode(struct inode *inode);
240 extern int fat_get_cluster(struct inode *inode, int cluster,
241 int *fclus, int *dclus);
242 extern int fat_free(struct inode *inode, int skip);
245 extern struct file_operations fat_dir_operations;
246 extern int fat_search_long(struct inode *inode, const unsigned char *name,
247 int name_len, int anycase,
248 loff_t *spos, loff_t *lpos);
249 extern int fat_readdir(struct file *filp, void *dirent, filldir_t filldir);
250 extern int fat_dir_ioctl(struct inode * inode, struct file * filp,
251 unsigned int cmd, unsigned long arg);
252 extern int fat_dir_empty(struct inode *dir);
253 extern int fat_add_entries(struct inode *dir, int slots, struct buffer_head **bh,
254 struct msdos_dir_entry **de, loff_t *i_pos);
255 extern int fat_new_dir(struct inode *dir, struct inode *parent, int is_vfat);
258 extern struct file_operations fat_file_operations;
259 extern struct inode_operations fat_file_inode_operations;
260 extern int fat_get_block(struct inode *inode, sector_t iblock,
261 struct buffer_head *bh_result, int create);
262 extern void fat_truncate(struct inode *inode);
265 extern void fat_hash_init(void);
266 extern void fat_attach(struct inode *inode, loff_t i_pos);
267 extern void fat_detach(struct inode *inode);
268 extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
269 extern struct inode *fat_build_inode(struct super_block *sb,
270 struct msdos_dir_entry *de, loff_t i_pos, int *res);
271 extern void fat_delete_inode(struct inode *inode);
272 extern void fat_clear_inode(struct inode *inode);
273 extern void fat_put_super(struct super_block *sb);
274 int fat_fill_super(struct super_block *sb, void *data, int silent,
275 struct inode_operations *fs_dir_inode_ops, int isvfat);
276 extern int fat_statfs(struct super_block *sb, struct kstatfs *buf);
277 extern void fat_write_inode(struct inode *inode, int wait);
278 extern int fat_notify_change(struct dentry * dentry, struct iattr * attr);
281 extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
282 extern void lock_fat(struct super_block *sb);
283 extern void unlock_fat(struct super_block *sb);
284 extern void fat_clusters_flush(struct super_block *sb);
285 extern int fat_add_cluster(struct inode *inode);
286 extern struct buffer_head *fat_extend_dir(struct inode *inode);
287 extern int date_dos2unix(unsigned short time, unsigned short date);
288 extern void fat_date_unix2dos(int unix_date, unsigned short *time,
289 unsigned short *date);
290 extern int fat__get_entry(struct inode *dir, loff_t *pos,
291 struct buffer_head **bh,
292 struct msdos_dir_entry **de, loff_t *i_pos);
293 static __inline__ int fat_get_entry(struct inode *dir, loff_t *pos,
294 struct buffer_head **bh,
295 struct msdos_dir_entry **de, loff_t *i_pos)
297 /* Fast stuff first */
299 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
300 *pos += sizeof(struct msdos_dir_entry);
305 return fat__get_entry(dir, pos, bh, de, i_pos);
307 extern int fat_subdirs(struct inode *dir);
308 extern int fat_scan(struct inode *dir, const unsigned char *name,
309 struct buffer_head **res_bh,
310 struct msdos_dir_entry **res_de, loff_t *i_pos);
312 /* msdos/namei.c - these are for Umsdos */
313 extern struct dentry *msdos_lookup(struct inode *dir, struct dentry *, struct nameidata *);
314 extern int msdos_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
315 extern int msdos_rmdir(struct inode *dir, struct dentry *dentry);
316 extern int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode);
317 extern int msdos_unlink(struct inode *dir, struct dentry *dentry);
318 extern int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
319 struct inode *new_dir, struct dentry *new_dentry);
320 extern int msdos_fill_super(struct super_block *sb, void *data, int silent);
322 /* vfat/namei.c - these are for dmsdos */
323 extern struct dentry *vfat_lookup(struct inode *dir, struct dentry *, struct nameidata *);
324 extern int vfat_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
325 extern int vfat_rmdir(struct inode *dir, struct dentry *dentry);
326 extern int vfat_unlink(struct inode *dir, struct dentry *dentry);
327 extern int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode);
328 extern int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
329 struct inode *new_dir, struct dentry *new_dentry);
330 extern int vfat_fill_super(struct super_block *sb, void *data, int silent);
332 /* vfat/vfatfs_syms.c */
333 extern struct file_system_type vfat_fs_type;
335 #endif /* __KERNEL__ */