ext2_fs.h

嵌入式ARM的一些源代码

#define i_uid_high	osd2.hurd2.h_i_uid_high
#define i_gid_high	osd2.hurd2.h_i_gid_high
#define i_author	osd2.hurd2.h_i_author
#endif

#ifdef	__masix__
#define i_reserved1	osd1.masix1.m_i_reserved1
#define i_frag		osd2.masix2.m_i_frag
#define i_fsize		osd2.masix2.m_i_fsize
#define i_reserved2	osd2.masix2.m_i_reserved2
#endif

/*
 * File system states
 */
#define	EXT2_VALID_FS			0x0001	/* Unmounted cleanly */
#define	EXT2_ERROR_FS			0x0002	/* Errors detected */

/*
 * Mount flags
 */
#define EXT2_MOUNT_CHECK_NORMAL		0x0001	/* Do some more checks */
#define EXT2_MOUNT_CHECK_STRICT		0x0002	/* Do again more checks */
#define EXT2_MOUNT_CHECK		(EXT2_MOUNT_CHECK_NORMAL | \
					 EXT2_MOUNT_CHECK_STRICT)
#define EXT2_MOUNT_GRPID		0x0004	/* Create files with directory's group */
#define EXT2_MOUNT_DEBUG		0x0008	/* Some debugging messages */
#define EXT2_MOUNT_ERRORS_CONT		0x0010	/* Continue on errors */
#define EXT2_MOUNT_ERRORS_RO		0x0020	/* Remount fs ro on errors */
#define EXT2_MOUNT_ERRORS_PANIC		0x0040	/* Panic on errors */
#define EXT2_MOUNT_MINIX_DF		0x0080	/* Mimics the Minix statfs */
#define EXT2_MOUNT_NO_ATIME		0x0100  /* Don't update the atime */

#define clear_opt(o, opt)		o &= ~EXT2_MOUNT_##opt
#define set_opt(o, opt)			o |= EXT2_MOUNT_##opt
#define test_opt(sb, opt)		((sb)->u.ext2_sb.s_mount_opt & \
					 EXT2_MOUNT_##opt)
/*
 * Maximal mount counts between two filesystem checks
 */
#define EXT2_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
#define EXT2_DFL_CHECKINTERVAL		0	/* Don't use interval check */

/*
 * Behaviour when detecting errors
 */
#define EXT2_ERRORS_CONTINUE		1	/* Continue execution */
#define EXT2_ERRORS_RO			2	/* Remount fs read-only */
#define EXT2_ERRORS_PANIC		3	/* Panic */
#define EXT2_ERRORS_DEFAULT		EXT2_ERRORS_CONTINUE

/*
 * Structure of the super block
 */
struct ext2_super_block {
	__u32	s_inodes_count;		/* Inodes count */
	__u32	s_blocks_count;		/* Blocks count */
	__u32	s_r_blocks_count;	/* Reserved blocks count */
	__u32	s_free_blocks_count;	/* Free blocks count */
	__u32	s_free_inodes_count;	/* Free inodes count */
	__u32	s_first_data_block;	/* First Data Block */
	__u32	s_log_block_size;	/* Block size */
	__s32	s_log_frag_size;	/* Fragment size */
	__u32	s_blocks_per_group;	/* # Blocks per group */
	__u32	s_frags_per_group;	/* # Fragments per group */
	__u32	s_inodes_per_group;	/* # Inodes per group */
	__u32	s_mtime;		/* Mount time */
	__u32	s_wtime;		/* Write time */
	__u16	s_mnt_count;		/* Mount count */
	__s16	s_max_mnt_count;	/* Maximal mount count */
	__u16	s_magic;		/* Magic signature */
	__u16	s_state;		/* File system state */
	__u16	s_errors;		/* Behaviour when detecting errors */
	__u16	s_minor_rev_level; 	/* minor revision level */
	__u32	s_lastcheck;		/* time of last check */
	__u32	s_checkinterval;	/* max. time between checks */
	__u32	s_creator_os;		/* OS */
	__u32	s_rev_level;		/* Revision level */
	__u16	s_def_resuid;		/* Default uid for reserved blocks */
	__u16	s_def_resgid;		/* Default gid for reserved blocks */
	/*
	 * These fields are for EXT2_DYNAMIC_REV superblocks only.
	 *
	 * Note: the difference between the compatible feature set and
	 * the incompatible feature set is that if there is a bit set
	 * in the incompatible feature set that the kernel doesn't
	 * know about, it should refuse to mount the filesystem.
	 * 
	 * e2fsck's requirements are more strict; if it doesn't know
	 * about a feature in either the compatible or incompatible
	 * feature set, it must abort and not try to meddle with
	 * things it doesn't understand...
	 */
	__u32	s_first_ino; 		/* First non-reserved inode */
	__u16   s_inode_size; 		/* size of inode structure */
	__u16	s_block_group_nr; 	/* block group # of this superblock */
	__u32	s_feature_compat; 	/* compatible feature set */
	__u32	s_feature_incompat; 	/* incompatible feature set */
	__u32	s_feature_ro_compat; 	/* readonly-compatible feature set */
	__u32	s_reserved[230];	/* Padding to the end of the block */
};

/*
 * Codes for operating systems
 */
#define EXT2_OS_LINUX		0
#define EXT2_OS_HURD		1
#define EXT2_OS_MASIX		2
#define EXT2_OS_FREEBSD		3
#define EXT2_OS_LITES		4

/*
 * Revision levels
 */
#define EXT2_GOOD_OLD_REV	0	/* The good old (original) format */
#define EXT2_DYNAMIC_REV	1 	/* V2 format w/ dynamic inode sizes */

#define EXT2_CURRENT_REV	EXT2_GOOD_OLD_REV
#define EXT2_MAX_SUPP_REV	EXT2_DYNAMIC_REV

#define EXT2_GOOD_OLD_INODE_SIZE 128

/*
 * Default values for user and/or group using reserved blocks
 */
#define	EXT2_DEF_RESUID		0
#define	EXT2_DEF_RESGID		0

/*
 * Structure of a directory entry
 */
#define EXT2_NAME_LEN 255

struct ext2_dir_entry {
	__u32	inode;			/* Inode number */
	__u16	rec_len;		/* Directory entry length */
	__u16	name_len;		/* Name length */
	char	name[EXT2_NAME_LEN];	/* File name */
};

/*
 * EXT2_DIR_PAD defines the directory entries boundaries
 *
 * NOTE: It must be a multiple of 4
 */
#define EXT2_DIR_PAD		 	4
#define EXT2_DIR_ROUND 			(EXT2_DIR_PAD - 1)
#define EXT2_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT2_DIR_ROUND) & \
					 ~EXT2_DIR_ROUND)

/*
 * Feature set definitions --- none are defined as of now
 */
#define EXT2_FEATURE_COMPAT_SUPP	0
#define EXT2_FEATURE_INCOMPAT_SUPP	0
#define EXT2_FEATURE_RO_COMPAT_SUPP	0

#ifdef __KERNEL__
/*
 * Function prototypes
 */

/*
 * Ok, these declarations are also in <linux/kernel.h> but none of the
 * ext2 source programs needs to include it so they are duplicated here.
 */
# define NORET_TYPE    /**/
# define ATTRIB_NORET  __attribute__((noreturn))
# define NORET_AND     noreturn,

/* acl.c */
extern int ext2_permission (struct inode *, int);

/* balloc.c */
extern int ext2_new_block (const struct inode *, unsigned long,
			   __u32 *, __u32 *, int *);
extern void ext2_free_blocks (const struct inode *, unsigned long,
			      unsigned long);
extern unsigned long ext2_count_free_blocks (struct super_block *);
extern void ext2_check_blocks_bitmap (struct super_block *);

/* bitmap.c */
extern unsigned long ext2_count_free (struct buffer_head *, unsigned);

/* dir.c */
extern int ext2_check_dir_entry (const char *, struct inode *,
				 struct ext2_dir_entry *, struct buffer_head *,
				 unsigned long);

/* file.c */
extern int ext2_read (struct inode *, struct file *, char *, int);
extern int ext2_write (struct inode *, struct file *, char *, int);

/* fsync.c */
extern int ext2_sync_file (struct inode *, struct file *);

/* ialloc.c */
extern struct inode * ext2_new_inode (const struct inode *, int, int *);
extern void ext2_free_inode (struct inode *);
extern unsigned long ext2_count_free_inodes (struct super_block *);
extern void ext2_check_inodes_bitmap (struct super_block *);

/* inode.c */
extern int ext2_bmap (struct inode *, int);

extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *);
extern struct buffer_head * ext2_bread (struct inode *, int, int, int *);

extern int ext2_getcluster (struct inode * inode, long block);
extern void ext2_read_inode (struct inode *);
extern void ext2_write_inode (struct inode *);
extern void ext2_put_inode (struct inode *);
extern int ext2_sync_inode (struct inode *);
extern void ext2_discard_prealloc (struct inode *);

/* ioctl.c */
extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
		       unsigned long);

/* namei.c */
extern void ext2_release (struct inode *, struct file *);
extern int ext2_lookup (struct inode *,const char *, int, struct inode **);
extern int ext2_create (struct inode *,const char *, int, int,
			struct inode **);
extern int ext2_mkdir (struct inode *, const char *, int, int);
extern int ext2_rmdir (struct inode *, const char *, int);
extern int ext2_unlink (struct inode *, const char *, int);
extern int ext2_symlink (struct inode *, const char *, int, const char *);
extern int ext2_link (struct inode *, struct inode *, const char *, int);
extern int ext2_mknod (struct inode *, const char *, int, int, int);
extern int ext2_rename (struct inode *, const char *, int,
			struct inode *, const char *, int, int);

/* super.c */
extern void ext2_error (struct super_block *, const char *, const char *, ...)
	__attribute__ ((format (printf, 3, 4)));
extern NORET_TYPE void ext2_panic (struct super_block *, const char *,
				   const char *, ...)
	__attribute__ ((NORET_AND format (printf, 3, 4)));
extern void ext2_warning (struct super_block *, const char *, const char *, ...)
	__attribute__ ((format (printf, 3, 4)));
extern void ext2_put_super (struct super_block *);
extern void ext2_write_super (struct super_block *);
extern int ext2_remount (struct super_block *, int *, char *);
extern struct super_block * ext2_read_super (struct super_block *,void *,int);
extern int init_ext2_fs(void);
extern void ext2_statfs (struct super_block *, struct statfs *, int);

/* truncate.c */
extern void ext2_truncate (struct inode *);

/*
 * Inodes and files operations
 */

/* dir.c */
extern struct inode_operations ext2_dir_inode_operations;

/* file.c */
extern struct inode_operations ext2_file_inode_operations;

/* symlink.c */
extern struct inode_operations ext2_symlink_inode_operations;

#endif	/* __KERNEL__ */

#endif	/* _LINUX_EXT2_FS_H */