minix_fs.h

LINUX1.0内核源代码,学习LINUX编程的一定要看。

#ifndef _LINUX_MINIX_FS_H
#define _LINUX_MINIX_FS_H

/*
 * The minix filesystem constants/structures
 */

/*
 * Thanks to Kees J Bot for sending me the definitions of the new
 * minix filesystem (aka V2) with bigger inodes and 32-bit block
 * pointers. It's not actually implemented yet, but I'll look into
 * it.
 */

#define MINIX_ROOT_INO 1

/* Not the same as the bogus LINK_MAX in <linux/limits.h>. Oh well. */
#define MINIX_LINK_MAX	250

#define MINIX_I_MAP_SLOTS	8
#define MINIX_Z_MAP_SLOTS	8
#define MINIX_SUPER_MAGIC	0x137F		/* original minix fs */
#define MINIX_SUPER_MAGIC2	0x138F		/* minix fs, 30 char names */
#define NEW_MINIX_SUPER_MAGIC	0x2468		/* minix V2 - not implemented */
#define MINIX_VALID_FS		0x0001		/* Clean fs. */
#define MINIX_ERROR_FS		0x0002		/* fs has errors. */

#define MINIX_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct minix_inode)))

struct minix_inode {
	unsigned short i_mode;
	unsigned short i_uid;
	unsigned long i_size;
	unsigned long i_time;
	unsigned char i_gid;
	unsigned char i_nlinks;
	unsigned short i_zone[9];
};

/*
 * The new minix inode has all the time entries, as well as
 * long block numbers and a third indirect block (7+1+1+1
 * instead of 7+1+1). Also, some previously 8-bit values are
 * now 16-bit. The inode is now 64 bytes instead of 32.
 */
struct new_minix_inode {
	unsigned short i_mode;
	unsigned short i_nlinks;
	unsigned short i_uid;
	unsigned short i_gid;
	unsigned long i_size;
	unsigned long i_atime;
	unsigned long i_mtime;
	unsigned long i_ctime;
	unsigned long i_zone[10];
};

/*
 * minix super-block data on disk
 */
struct minix_super_block {
	unsigned short s_ninodes;
	unsigned short s_nzones;
	unsigned short s_imap_blocks;
	unsigned short s_zmap_blocks;
	unsigned short s_firstdatazone;
	unsigned short s_log_zone_size;
	unsigned long s_max_size;
	unsigned short s_magic;
	unsigned short s_state;
};

struct minix_dir_entry {
	unsigned short inode;
	char name[0];
};

extern int minix_lookup(struct inode * dir,const char * name, int len,
	struct inode ** result);
extern int minix_create(struct inode * dir,const char * name, int len, int mode,
	struct inode ** result);
extern int minix_mkdir(struct inode * dir, const char * name, int len, int mode);
extern int minix_rmdir(struct inode * dir, const char * name, int len);
extern int minix_unlink(struct inode * dir, const char * name, int len);
extern int minix_symlink(struct inode * inode, const char * name, int len,
	const char * symname);
extern int minix_link(struct inode * oldinode, struct inode * dir, const char * name, int len);
extern int minix_mknod(struct inode * dir, const char * name, int len, int mode, int rdev);
extern int minix_rename(struct inode * old_dir, const char * old_name, int old_len,
	struct inode * new_dir, const char * new_name, int new_len);
extern struct inode * minix_new_inode(const struct inode * dir);
extern void minix_free_inode(struct inode * inode);
extern unsigned long minix_count_free_inodes(struct super_block *sb);
extern int minix_new_block(struct super_block * sb);
extern void minix_free_block(struct super_block * sb, int block);
extern unsigned long minix_count_free_blocks(struct super_block *sb);

extern int minix_bmap(struct inode *,int);

extern struct buffer_head * minix_getblk(struct inode *, int, int);
extern struct buffer_head * minix_bread(struct inode *, int, int);

extern void minix_truncate(struct inode *);
extern void minix_put_super(struct super_block *);
extern struct super_block *minix_read_super(struct super_block *,void *,int);
extern void minix_write_super(struct super_block *);
extern int minix_remount (struct super_block * sb, int * flags, char * data);
extern void minix_read_inode(struct inode *);
extern void minix_write_inode(struct inode *);
extern void minix_put_inode(struct inode *);
extern void minix_statfs(struct super_block *, struct statfs *);
extern int minix_sync_inode(struct inode *);
extern int minix_sync_file(struct inode *, struct file *);

extern struct inode_operations minix_file_inode_operations;
extern struct inode_operations minix_dir_inode_operations;
extern struct inode_operations minix_symlink_inode_operations;

#endif