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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 | #ifndef _LINUX_MSDOS_FS_H #define _LINUX_MSDOS_FS_H /* * The MS-DOS filesystem constants/structures */ #include <asm/byteorder.h> #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_SUPER_MAGIC 0x4d44 /* MD */ #define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */ #define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */ /* directory limit */ #define FAT_MAX_DIR_ENTRIES (65536) #define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS) #define ATTR_NONE 0 /* no attribute bits */ #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 */ /* attribute bits that are copied "as is" */ #define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN) /* bits that are used by the Windows 95/Windows NT extended FAT */ #define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME) #define CASE_LOWER_BASE 8 /* base is lower case */ #define CASE_LOWER_EXT 16 /* extension is lower case */ #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ #define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) /* valid file mode bits */ #define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO) /* 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) #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 */ /* media of boot sector */ #define FAT_VALID_MEDIA(x) ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0) #define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \ MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x)) /* maximum number of clusters */ #define MAX_FAT12 0xFF4 #define MAX_FAT16 0xFFF4 #define MAX_FAT32 0x0FFFFFF6 #define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \ MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12) /* bad cluster mark */ #define BAD_FAT12 0xFF7 #define BAD_FAT16 0xFFF7 #define BAD_FAT32 0x0FFFFFF7 #define BAD_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? BAD_FAT32 : \ MSDOS_SB(s)->fat_bits == 16 ? BAD_FAT16 : BAD_FAT12) /* standard EOF */ #define EOF_FAT12 0xFFF #define EOF_FAT16 0xFFFF #define EOF_FAT32 0x0FFFFFFF #define EOF_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? EOF_FAT32 : \ MSDOS_SB(s)->fat_bits == 16 ? EOF_FAT16 : EOF_FAT12) #define FAT_ENT_FREE (0) #define FAT_ENT_BAD (BAD_FAT32) #define FAT_ENT_EOF (EOF_FAT32) #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) /* * 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 { __u8 ignored[3]; /* Boot strap short or near jump */ __u8 system_id[8]; /* Name - can be used to special case partition manager volumes */ __u8 sector_size[2]; /* bytes per logical sector */ __u8 sec_per_clus; /* 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 */ __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 */ __u32 reserved2[4]; }; struct msdos_dir_entry { __u8 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 long_slots; /* number of long slots in filename */ loff_t longname_offset; /* dir offset for longname start */ loff_t i_pos; /* on-disk position of directory entry */ }; #ifdef __KERNEL__ #include <linux/buffer_head.h> #include <linux/string.h> #include <linux/nls.h> #include <linux/msdos_fs_i.h> #include <linux/msdos_fs_sb.h> static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) { return sb->s_fs_info; } static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) { return container_of(inode, struct msdos_inode_info, vfs_inode); } 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/cache.c */ extern int fat_access(struct super_block *sb, int nr, int new_value); extern int __fat_access(struct super_block *sb, int nr, int new_value); extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys); extern void fat_cache_init(struct super_block *sb); 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 int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus); 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 unsigned 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_add_entries(struct inode *dir, int slots, struct buffer_head **bh, struct msdos_dir_entry **de, loff_t *i_pos); extern int fat_new_dir(struct inode *dir, struct inode *parent, int is_vfat); extern int fat_dir_empty(struct inode *dir); extern int fat_subdirs(struct inode *dir); extern int fat_scan(struct inode *dir, const unsigned char *name, struct buffer_head **res_bh, struct msdos_dir_entry **res_de, loff_t *i_pos); /* fat/file.c */ extern struct file_operations fat_file_operations; extern struct inode_operations fat_file_inode_operations; extern int fat_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create); extern void fat_truncate(struct inode *inode); /* fat/inode.c */ extern void fat_hash_init(void); extern void fat_attach(struct inode *inode, loff_t i_pos); extern void fat_detach(struct inode *inode); extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos); extern struct inode *fat_build_inode(struct super_block *sb, struct msdos_dir_entry *de, loff_t i_pos, 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); int fat_fill_super(struct super_block *sb, void *data, int silent, struct inode_operations *fs_dir_inode_ops, int isvfat); extern int fat_statfs(struct super_block *sb, struct kstatfs *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 *fmt, ...); 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, loff_t *i_pos); static __inline__ int fat_get_entry(struct inode *dir, loff_t *pos, struct buffer_head **bh, struct msdos_dir_entry **de, loff_t *i_pos) { /* 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)++; (*i_pos)++; return 0; } return fat__get_entry(dir, pos, bh, de, i_pos); } #endif /* __KERNEL__ */ #endif |