diff options
Diffstat (limited to 'include/linux/msdos_fs.h')
| -rw-r--r-- | include/linux/msdos_fs.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/include/linux/msdos_fs.h b/include/linux/msdos_fs.h new file mode 100644 index 000000000..dd6699a0d --- /dev/null +++ b/include/linux/msdos_fs.h @@ -0,0 +1,194 @@ +#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) /* 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_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) + +#ifdef __KERNEL__ + +static inline struct buffer_head *msdos_sread(int dev,int sector) +{ + return bread(dev,sector,SECTOR_SIZE); +} + + +/* 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,loff_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_unlink_umsdos(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(struct inode *,struct iattr *); + +/* dir.c */ + +extern struct inode_operations msdos_dir_inode_operations; +extern int msdos_readdir (struct inode *inode, struct file *filp, + struct dirent *dirent, int count); +/* file.c */ + +extern struct inode_operations msdos_file_inode_operations; +extern int msdos_file_read(struct inode *, struct file *, char *, int); +extern int msdos_file_write(struct inode *, struct file *, char *, int); +extern struct inode_operations msdos_file_inode_operations_no_bmap; + +extern void msdos_truncate(struct inode *inode); + +/* mmap.c */ +extern int msdos_mmap(struct inode *, struct file *, struct vm_area_struct *); + +#endif /* __KERNEL__ */ + +#endif |