#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>#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*2) /* dir entries per block */#define MSDOS_DPB_BITS	5 /* 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 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 DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */#define IS_FREE(n) (!*(n) || *(unsigned char *) (n) == DELETED_FLAG || \  *(unsigned char *) (n) == FD_FILL_BYTE)#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_DOT    ".          " /* ".", padded to MSDOS_NAME chars */#define MSDOS_DOTDOT "..         " /* "..", padded to MSDOS_NAME chars */#define MSDOS_FAT12 4078 /* maximum number of clusters in a 12 bit FAT *//* * 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) (v)#define CF_LE_L(v) (v)#define CT_LE_W(v) (v)#define CT_LE_L(v) (v)struct msdos_boot_sector {	char ignored[3];	    /* Boot strap short or near jump */	char system_id[8];	    /* Name - can be used to special case				       partition manager volumes */	unsigned char sector_size[2];/* bytes per logical sector */	unsigned char cluster_size; /* sectors/cluster */	unsigned short reserved;    /* reserved sectors */	unsigned char fats;	    /* number of FATs */	unsigned char dir_entries[2];/* root directory entries */	unsigned char sectors[2];   /* number of sectors */	unsigned char media;	    /* media code (unused) */	unsigned short fat_length;  /* sectors/FAT */	unsigned short secs_track;  /* sectors per track */	unsigned short heads;	    /* number of heads */	unsigned long hidden;	    /* hidden sectors (unused) */	unsigned long total_sect;   /* number of sectors (if sectors == 0) */};struct msdos_dir_entry {	char name[8],ext[3]; /* name and extension */	unsigned char attr;  /* attribute bits */	char unused[10];	unsigned short time,date,start; /* time, date and first cluster */	unsigned long size;  /* file size (in bytes) */};struct fat_cache {	int device; /* device number. 0 means unused. */	int ino; /* inode number. */	int file_cluster; /* cluster number in the file. */	int disk_cluster; /* cluster number on disk. */	struct fat_cache *next; /* next cache entry */};/* 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)static inline struct buffer_head *msdos_sread(int dev,int sector,void **start){ 	struct buffer_head *bh;	if (!(bh = bread(dev,sector >> 1, 1024)))		return NULL;    	*start = bh->b_data+((sector & 1) << SECTOR_BITS);	return bh;}/* misc.c */extern void fs_panic(struct super_block *s,char *msg);extern int is_binary(char conversion,char *extension);extern void lock_creation(void);extern void unlock_creation(void);extern void lock_fat(struct super_block *sb);extern void unlock_fat(struct super_block *sb);extern int msdos_add_cluster(struct inode *inode);extern int date_dos2unix(unsigned short time,unsigned short date);extern void date_unix2dos(int unix_date,unsigned short *time,    unsigned short *date);extern int msdos_get_entry(struct inode *dir,off_t *pos,struct buffer_head **bh,    struct msdos_dir_entry **de);extern int msdos_scan(struct inode *dir,char *name,struct buffer_head **res_bh,    struct msdos_dir_entry **res_de,int *ino);extern int msdos_parent_ino(struct inode *dir,int locked);extern int msdos_subdirs(struct inode *dir);/* fat.c */extern int fat_access(struct super_block *sb,int nr,int new_value);extern int msdos_smap(struct inode *inode,int sector);extern int fat_free(struct inode *inode,int skip);extern void cache_init(void);void cache_lookup(struct inode *inode,int cluster,int *f_clu,int *d_clu);void cache_add(struct inode *inode,int f_clu,int d_clu);void cache_inval_inode(struct inode *inode);void cache_inval_dev(int device);int get_cluster(struct inode *inode,int cluster);/* namei.c */extern int msdos_lookup(struct inode *dir,const char *name,int len,	struct inode **result);extern int msdos_create(struct inode *dir,const char *name,int len,int mode,	struct inode **result);extern int msdos_mkdir(struct inode *dir,const char *name,int len,int mode);extern int msdos_rmdir(struct inode *dir,const char *name,int len);extern int msdos_unlink(struct inode *dir,const char *name,int len);extern int msdos_rename(struct inode *old_dir,const char *old_name,int old_len,	struct inode *new_dir,const char *new_name,int new_len);/* inode.c */extern void msdos_put_inode(struct inode *inode);extern void msdos_put_super(struct super_block *sb);extern struct super_block *msdos_read_super(struct super_block *s,					    void *data,int);extern void msdos_statfs(struct super_block *sb,struct statfs *buf);extern int msdos_bmap(struct inode *inode,int block);extern void msdos_read_inode(struct inode *inode);extern void msdos_write_inode(struct inode *inode);extern int msdos_notify_change(int flags,struct inode *inode);/* dir.c */extern struct inode_operations msdos_dir_inode_operations;/* file.c */extern struct inode_operations msdos_file_inode_operations;extern struct inode_operations msdos_file_inode_operations_no_bmap;extern void msdos_truncate(struct inode *inode);#endif