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- #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 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)
-
-
- #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 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))
-
- /* start of data cluster's entry (number of reserved clusters) */
- #define FAT_START_ENT 2
-
- /* 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) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
- && le32_to_cpu((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 */
-
- 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 */
- __le16 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 */
- __le16 fat_length; /* sectors/FAT */
- __le16 secs_track; /* sectors per track */
- __le16 heads; /* number of heads */
- __le32 hidden; /* hidden sectors (unused) */
- __le32 total_sect; /* number of sectors (if sectors == 0) */
-
- /* The following fields are only used by FAT32 */
- __le32 fat32_length; /* sectors/FAT */
- __le16 flags; /* bit 8: fat mirroring, low 4: active fat */
- __u8 version[2]; /* major, minor filesystem version */
- __le32 root_cluster; /* first cluster in root directory */
- __le16 info_sector; /* filesystem info sector */
- __le16 backup_boot; /* backup boot sector */
- __le16 reserved2[6]; /* Unused */
- };
-
- struct fat_boot_fsinfo {
- __le32 signature1; /* 0x41615252L */
- __le32 reserved1[120]; /* Nothing as far as I can tell */
- __le32 signature2; /* 0x61417272L */
- __le32 free_clusters; /* Free cluster count. -1 if unknown */
- __le32 next_cluster; /* Most recently allocated cluster */
- __le32 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 */
- __le16 ctime; /* Creation time */
- __le16 cdate; /* Creation date */
- __le16 adate; /* Last access date */
- __le16 starthi; /* High 16 bits of cluster in FAT32 */
- __le16 time,date,start;/* time, date and first cluster */
- __le32 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 */
- __le16 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/fs.h>
-
- struct fat_mount_options {
- uid_t fs_uid;
- gid_t fs_gid;
- unsigned short fs_fmask;
- unsigned short fs_dmask;
- unsigned short codepage; /* Codepage for shortname conversions */
- char *iocharset; /* Charset used for filename input/display */
- unsigned short shortname; /* flags for shortname display/create rule */
- unsigned char name_check; /* r = relaxed, n = normal, s = strict */
- unsigned quiet:1, /* set = fake successful chmods and chowns */
- showexec:1, /* set = only set x bit for com/exe/bat */
- sys_immutable:1, /* set = system files are immutable */
- dotsOK:1, /* set = hidden and system files are named '.filename' */
- isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
- utf8:1, /* Use of UTF8 character set (Default) */
- unicode_xlate:1, /* create escape sequences for unhandled Unicode */
- numtail:1, /* Does first alias have a numeric '~1' type tail? */
- atari:1, /* Use Atari GEMDOS variation of MS-DOS fs */
- nocase:1; /* Does this need case conversion? 0=need case conversion*/
- };
-
- #define FAT_HASH_BITS 8
- #define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
- #define FAT_HASH_MASK (FAT_HASH_SIZE-1)
-
- /*
- * MS-DOS file system in-core superblock data
- */
- struct msdos_sb_info {
- unsigned short sec_per_clus; /* sectors/cluster */
- unsigned short cluster_bits; /* log2(cluster_size) */
- unsigned int cluster_size; /* cluster size */
- unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
- unsigned short fat_start;
- unsigned long fat_length; /* FAT start & length (sec.) */
- unsigned long dir_start;
- unsigned short dir_entries; /* root dir start & entries */
- unsigned long data_start; /* first data sector */
- unsigned long max_cluster; /* maximum cluster number */
- unsigned long root_cluster; /* first cluster of the root directory */
- unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
- struct semaphore fat_lock;
- int prev_free; /* previously allocated cluster number */
- int free_clusters; /* -1 if undefined */
- struct fat_mount_options options;
- struct nls_table *nls_disk; /* Codepage used on disk */
- struct nls_table *nls_io; /* Charset used for input and display */
- void *dir_ops; /* Opaque; default directory operations */
- int dir_per_block; /* dir entries per block */
- int dir_per_block_bits; /* log2(dir_per_block) */
-
- spinlock_t inode_hash_lock;
- struct hlist_head inode_hashtable[FAT_HASH_SIZE];
- };
-
- #define FAT_CACHE_VALID 0 /* special case for valid cache */
-
- /*
- * MS-DOS file system inode data in memory
- */
- struct msdos_inode_info {
- spinlock_t cache_lru_lock;
- struct list_head cache_lru;
- int nr_caches;
- /* for avoiding the race between fat_free() and fat_get_cluster() */
- unsigned int cache_valid_id;
-
- loff_t mmu_private;
- int i_start; /* first cluster or 0 */
- int i_logstart; /* logical first cluster */
- int i_attrs; /* unused attribute bits */
- int i_ctime_ms; /* unused change time in milliseconds */
- loff_t i_pos; /* on-disk position of directory entry or 0 */
- struct hlist_node i_fat_hash; /* hash by i_location */
- struct inode vfs_inode;
- };
-
- 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 sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
- {
- return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
- + sbi->data_start;
- }
-
- 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 void fat_cache_inval_inode(struct inode *inode);
- extern int fat_access(struct super_block *sb, int nr, int new_value);
- extern int fat_get_cluster(struct inode *inode, int cluster,
- int *fclus, int *dclus);
- extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys);
-
- /* 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_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_notify_change(struct dentry * dentry, struct iattr * attr);
- extern void fat_truncate(struct inode *inode);
-
- /* fat/inode.c */
- 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);
- int fat_fill_super(struct super_block *sb, void *data, int silent,
- struct inode_operations *fs_dir_inode_ops, int isvfat);
-
- /* 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 int date_dos2unix(unsigned short time, unsigned short date);
- extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *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
-