190 lines
6.5 KiB
C
190 lines
6.5 KiB
C
#ifndef _LINUX_MSDOS_FS_H
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#define _LINUX_MSDOS_FS_H
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/*
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* The MS-DOS filesystem constants/structures
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*/
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/fd.h>
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#define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */
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#define SECTOR_SIZE 512 /* sector size (bytes) */
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#define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */
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#define MSDOS_DPB (MSDOS_DPS*2) /* dir entries per block */
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#define MSDOS_DPB_BITS 5 /* log2(MSDOS_DPB) */
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#define MSDOS_DPS (SECTOR_SIZE/sizeof(struct msdos_dir_entry))
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#define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */
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#define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */
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#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
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#define FAT_CACHE 8 /* FAT cache size */
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#define ATTR_RO 1 /* read-only */
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#define ATTR_HIDDEN 2 /* hidden */
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#define ATTR_SYS 4 /* system */
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#define ATTR_VOLUME 8 /* volume label */
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#define ATTR_DIR 16 /* directory */
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#define ATTR_ARCH 32 /* archived */
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#define ATTR_NONE 0 /* no attribute bits */
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#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
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/* attribute bits that are copied "as is" */
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#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
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#define IS_FREE(n) (!*(n) || *(unsigned char *) (n) == DELETED_FLAG || \
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*(unsigned char *) (n) == FD_FILL_BYTE)
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#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
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/* valid file mode bits */
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#define MSDOS_SB(s) (&((s)->u.msdos_sb))
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#define MSDOS_I(i) (&((i)->u.msdos_i))
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#define MSDOS_NAME 11 /* maximum name length */
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#define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */
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#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
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#define MSDOS_FAT12 4078 /* maximum number of clusters in a 12 bit FAT */
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/*
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* Conversion from and to little-endian byte order. (no-op on i386/i486)
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*
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* Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian, BE = big-
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* endian, c: W = word (16 bits), L = longword (32 bits)
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*/
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#define CF_LE_W(v) (v)
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#define CF_LE_L(v) (v)
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#define CT_LE_W(v) (v)
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#define CT_LE_L(v) (v)
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struct msdos_boot_sector {
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char ignored[3]; /* Boot strap short or near jump */
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char system_id[8]; /* Name - can be used to special case
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partition manager volumes */
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unsigned char sector_size[2];/* bytes per logical sector */
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unsigned char cluster_size; /* sectors/cluster */
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unsigned short reserved; /* reserved sectors */
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unsigned char fats; /* number of FATs */
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unsigned char dir_entries[2];/* root directory entries */
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unsigned char sectors[2]; /* number of sectors */
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unsigned char media; /* media code (unused) */
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unsigned short fat_length; /* sectors/FAT */
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unsigned short secs_track; /* sectors per track */
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unsigned short heads; /* number of heads */
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unsigned long hidden; /* hidden sectors (unused) */
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unsigned long total_sect; /* number of sectors (if sectors == 0) */
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};
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struct msdos_dir_entry {
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char name[8],ext[3]; /* name and extension */
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unsigned char attr; /* attribute bits */
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char unused[10];
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unsigned short time,date,start; /* time, date and first cluster */
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unsigned long size; /* file size (in bytes) */
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};
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struct fat_cache {
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int device; /* device number. 0 means unused. */
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int ino; /* inode number. */
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int file_cluster; /* cluster number in the file. */
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int disk_cluster; /* cluster number on disk. */
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struct fat_cache *next; /* next cache entry */
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};
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/* Determine whether this FS has kB-aligned data. */
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#define MSDOS_CAN_BMAP(mib) (!(((mib)->cluster_size & 1) || \
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((mib)->data_start & 1)))
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/* Convert attribute bits and a mask to the UNIX mode. */
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#define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
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/* Convert the UNIX mode to MS-DOS attribute bits. */
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#define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
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static inline struct buffer_head *msdos_sread(int dev,int sector,void **start)
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{
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struct buffer_head *bh;
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if (!(bh = bread(dev,sector >> 1, 1024)))
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return NULL;
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*start = bh->b_data+((sector & 1) << SECTOR_BITS);
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return bh;
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}
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/* misc.c */
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extern void fs_panic(struct super_block *s,char *msg);
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extern int is_binary(char conversion,char *extension);
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extern void lock_creation(void);
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extern void unlock_creation(void);
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extern void lock_fat(struct super_block *sb);
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extern void unlock_fat(struct super_block *sb);
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extern int msdos_add_cluster(struct inode *inode);
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extern int date_dos2unix(unsigned short time,unsigned short date);
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extern void date_unix2dos(int unix_date,unsigned short *time,
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unsigned short *date);
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extern int msdos_get_entry(struct inode *dir,off_t *pos,struct buffer_head **bh,
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struct msdos_dir_entry **de);
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extern int msdos_scan(struct inode *dir,char *name,struct buffer_head **res_bh,
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struct msdos_dir_entry **res_de,int *ino);
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extern int msdos_parent_ino(struct inode *dir,int locked);
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extern int msdos_subdirs(struct inode *dir);
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/* fat.c */
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extern int fat_access(struct super_block *sb,int nr,int new_value);
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extern int msdos_smap(struct inode *inode,int sector);
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extern int fat_free(struct inode *inode,int skip);
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extern void cache_init(void);
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void cache_lookup(struct inode *inode,int cluster,int *f_clu,int *d_clu);
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void cache_add(struct inode *inode,int f_clu,int d_clu);
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void cache_inval_inode(struct inode *inode);
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void cache_inval_dev(int device);
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int get_cluster(struct inode *inode,int cluster);
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/* namei.c */
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extern int msdos_lookup(struct inode *dir,const char *name,int len,
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struct inode **result);
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extern int msdos_create(struct inode *dir,const char *name,int len,int mode,
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struct inode **result);
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extern int msdos_mkdir(struct inode *dir,const char *name,int len,int mode);
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extern int msdos_rmdir(struct inode *dir,const char *name,int len);
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extern int msdos_unlink(struct inode *dir,const char *name,int len);
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extern int msdos_rename(struct inode *old_dir,const char *old_name,int old_len,
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struct inode *new_dir,const char *new_name,int new_len);
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/* inode.c */
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extern void msdos_put_inode(struct inode *inode);
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extern void msdos_put_super(struct super_block *sb);
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extern struct super_block *msdos_read_super(struct super_block *s,
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void *data,int);
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extern void msdos_statfs(struct super_block *sb,struct statfs *buf);
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extern int msdos_bmap(struct inode *inode,int block);
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extern void msdos_read_inode(struct inode *inode);
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extern void msdos_write_inode(struct inode *inode);
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extern int msdos_notify_change(int flags,struct inode *inode);
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/* dir.c */
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extern struct inode_operations msdos_dir_inode_operations;
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/* file.c */
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extern struct inode_operations msdos_file_inode_operations;
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extern struct inode_operations msdos_file_inode_operations_no_bmap;
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extern void msdos_truncate(struct inode *inode);
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#endif
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