441 lines
15 KiB
C
441 lines
15 KiB
C
#ifndef _LINUX_MSDOS_FS_H
|
|
#define _LINUX_MSDOS_FS_H
|
|
|
|
#include <linux/magic.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_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))
|
|
|
|
#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 */
|
|
|
|
#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
|
|
|
|
/* standard EOF */
|
|
#define EOF_FAT12 0xFFF
|
|
#define EOF_FAT16 0xFFFF
|
|
#define EOF_FAT32 0x0FFFFFFF
|
|
|
|
#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])
|
|
/* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */
|
|
#define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32)
|
|
#define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32)
|
|
|
|
/*
|
|
* 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[MSDOS_NAME];/* name and extension */
|
|
__u8 attr; /* attribute bits */
|
|
__u8 lcase; /* Case for base and extension */
|
|
__u8 ctime_cs; /* Creation time, centiseconds (0-199) */
|
|
__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 fat_slot_info {
|
|
loff_t i_pos; /* on-disk position of directory entry */
|
|
loff_t slot_off; /* offset for slot or de start */
|
|
int nr_slots; /* number of slots + 1(de) in filename */
|
|
struct msdos_dir_entry *de;
|
|
struct buffer_head *bh;
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/string.h>
|
|
#include <linux/nls.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mutex.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 short allow_utime;/* permission for setting the [am]time */
|
|
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 UTF-8 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 */
|
|
flush:1, /* write things quickly */
|
|
nocase:1, /* Does this need case conversion? 0=need case conversion*/
|
|
usefree:1; /* Use free_clusters for FAT32 */
|
|
};
|
|
|
|
#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 mutex fat_lock;
|
|
unsigned int prev_free; /* previously allocated cluster number */
|
|
unsigned int free_clusters; /* -1 if undefined */
|
|
unsigned int free_clus_valid; /* is free_clusters valid? */
|
|
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 */
|
|
const void *dir_ops; /* Opaque; default directory operations */
|
|
int dir_per_block; /* dir entries per block */
|
|
int dir_per_block_bits; /* log2(dir_per_block) */
|
|
|
|
int fatent_shift;
|
|
struct fatent_operations *fatent_ops;
|
|
|
|
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 */
|
|
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);
|
|
}
|
|
|
|
/* Return the FAT attribute byte for this inode */
|
|
static inline u8 fat_attr(struct inode *inode)
|
|
{
|
|
return ((inode->i_mode & S_IWUGO) ? ATTR_NONE : ATTR_RO) |
|
|
(S_ISDIR(inode->i_mode) ? ATTR_DIR : ATTR_NONE) |
|
|
MSDOS_I(inode)->i_attrs;
|
|
}
|
|
|
|
static inline unsigned char fat_checksum(const __u8 *name)
|
|
{
|
|
unsigned char s = name[0];
|
|
s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
|
|
s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
|
|
s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
|
|
s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
|
|
s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
|
|
return s;
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
/* media of boot sector */
|
|
static inline int fat_valid_media(u8 media)
|
|
{
|
|
return 0xf8 <= media || media == 0xf0;
|
|
}
|
|
|
|
/* fat/cache.c */
|
|
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_bmap(struct inode *inode, sector_t sector, sector_t *phys,
|
|
unsigned long *mapped_blocks);
|
|
|
|
/* fat/dir.c */
|
|
extern const struct file_operations fat_dir_operations;
|
|
extern int fat_search_long(struct inode *inode, const unsigned char *name,
|
|
int name_len, struct fat_slot_info *sinfo);
|
|
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 fat_slot_info *sinfo);
|
|
extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
|
|
struct msdos_dir_entry **de, loff_t *i_pos);
|
|
extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
|
|
extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
|
|
struct fat_slot_info *sinfo);
|
|
extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
|
|
|
|
/* fat/fatent.c */
|
|
struct fat_entry {
|
|
int entry;
|
|
union {
|
|
u8 *ent12_p[2];
|
|
__le16 *ent16_p;
|
|
__le32 *ent32_p;
|
|
} u;
|
|
int nr_bhs;
|
|
struct buffer_head *bhs[2];
|
|
};
|
|
|
|
static inline void fatent_init(struct fat_entry *fatent)
|
|
{
|
|
fatent->nr_bhs = 0;
|
|
fatent->entry = 0;
|
|
fatent->u.ent32_p = NULL;
|
|
fatent->bhs[0] = fatent->bhs[1] = NULL;
|
|
}
|
|
|
|
static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
|
|
{
|
|
fatent->entry = entry;
|
|
fatent->u.ent32_p = NULL;
|
|
}
|
|
|
|
static inline void fatent_brelse(struct fat_entry *fatent)
|
|
{
|
|
int i;
|
|
fatent->u.ent32_p = NULL;
|
|
for (i = 0; i < fatent->nr_bhs; i++)
|
|
brelse(fatent->bhs[i]);
|
|
fatent->nr_bhs = 0;
|
|
fatent->bhs[0] = fatent->bhs[1] = NULL;
|
|
}
|
|
|
|
extern void fat_ent_access_init(struct super_block *sb);
|
|
extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
|
|
int entry);
|
|
extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
|
|
int new, int wait);
|
|
extern int fat_alloc_clusters(struct inode *inode, int *cluster,
|
|
int nr_cluster);
|
|
extern int fat_free_clusters(struct inode *inode, int cluster);
|
|
extern int fat_count_free_clusters(struct super_block *sb);
|
|
|
|
/* fat/file.c */
|
|
extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
|
|
unsigned int cmd, unsigned long arg);
|
|
extern const struct file_operations fat_file_operations;
|
|
extern const struct inode_operations fat_file_inode_operations;
|
|
extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
|
|
extern void fat_truncate(struct inode *inode);
|
|
extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat);
|
|
|
|
/* 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);
|
|
extern int fat_sync_inode(struct inode *inode);
|
|
extern int fat_fill_super(struct super_block *sb, void *data, int silent,
|
|
const struct inode_operations *fs_dir_inode_ops, int isvfat);
|
|
|
|
extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
|
|
struct inode *i2);
|
|
/* fat/misc.c */
|
|
extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
|
|
extern void fat_clusters_flush(struct super_block *sb);
|
|
extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
|
|
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_sync_bhs(struct buffer_head **bhs, int nr_bhs);
|
|
|
|
int fat_cache_init(void);
|
|
void fat_cache_destroy(void);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|