[net-next-2.6.git] / fs / ext3 / xattr.h

/*
  File: fs/ext3/xattr.h

  On-disk format of extended attributes for the ext3 filesystem.

  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/

#include <linux/xattr.h>

/* Magic value in attribute blocks */
#define EXT3_XATTR_MAGIC		0xEA020000

/* Maximum number of references to one attribute block */
#define EXT3_XATTR_REFCOUNT_MAX		1024

/* Name indexes */
#define EXT3_XATTR_INDEX_USER			1
#define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS	2
#define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT	3
#define EXT3_XATTR_INDEX_TRUSTED		4
#define	EXT3_XATTR_INDEX_LUSTRE			5
#define EXT3_XATTR_INDEX_SECURITY	        6

struct ext3_xattr_header {
	__le32	h_magic;	/* magic number for identification */
	__le32	h_refcount;	/* reference count */
	__le32	h_blocks;	/* number of disk blocks used */
	__le32	h_hash;		/* hash value of all attributes */
	__u32	h_reserved[4];	/* zero right now */
};

struct ext3_xattr_ibody_header {
	__le32	h_magic;	/* magic number for identification */
};

struct ext3_xattr_entry {
	__u8	e_name_len;	/* length of name */
	__u8	e_name_index;	/* attribute name index */
	__le16	e_value_offs;	/* offset in disk block of value */
	__le32	e_value_block;	/* disk block attribute is stored on (n/i) */
	__le32	e_value_size;	/* size of attribute value */
	__le32	e_hash;		/* hash value of name and value */
	char	e_name[0];	/* attribute name */
};

#define EXT3_XATTR_PAD_BITS		2
#define EXT3_XATTR_PAD		(1<<EXT3_XATTR_PAD_BITS)
#define EXT3_XATTR_ROUND		(EXT3_XATTR_PAD-1)
#define EXT3_XATTR_LEN(name_len) \
	(((name_len) + EXT3_XATTR_ROUND + \
	sizeof(struct ext3_xattr_entry)) & ~EXT3_XATTR_ROUND)
#define EXT3_XATTR_NEXT(entry) \
	( (struct ext3_xattr_entry *)( \
	  (char *)(entry) + EXT3_XATTR_LEN((entry)->e_name_len)) )
#define EXT3_XATTR_SIZE(size) \
	(((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND)

# ifdef CONFIG_EXT3_FS_XATTR

extern const struct xattr_handler ext3_xattr_user_handler;
extern const struct xattr_handler ext3_xattr_trusted_handler;
extern const struct xattr_handler ext3_xattr_acl_access_handler;
extern const struct xattr_handler ext3_xattr_acl_default_handler;
extern const struct xattr_handler ext3_xattr_security_handler;

extern ssize_t ext3_listxattr(struct dentry *, char *, size_t);

extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t);
extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);

extern void ext3_xattr_delete_inode(handle_t *, struct inode *);
extern void ext3_xattr_put_super(struct super_block *);

extern int init_ext3_xattr(void);
extern void exit_ext3_xattr(void);

extern const struct xattr_handler *ext3_xattr_handlers[];

# else  /* CONFIG_EXT3_FS_XATTR */

static inline int
ext3_xattr_get(struct inode *inode, int name_index, const char *name,
	       void *buffer, size_t size, int flags)
{
	return -EOPNOTSUPP;
}

static inline int
ext3_xattr_set(struct inode *inode, int name_index, const char *name,
	       const void *value, size_t size, int flags)
{
	return -EOPNOTSUPP;
}

static inline int
ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
	       const char *name, const void *value, size_t size, int flags)
{
	return -EOPNOTSUPP;
}

static inline void
ext3_xattr_delete_inode(handle_t *handle, struct inode *inode)
{
}

static inline void
ext3_xattr_put_super(struct super_block *sb)
{
}

static inline int
init_ext3_xattr(void)
{
	return 0;
}

static inline void
exit_ext3_xattr(void)
{
}

#define ext3_xattr_handlers	NULL

# endif  /* CONFIG_EXT3_FS_XATTR */

#ifdef CONFIG_EXT3_FS_SECURITY
extern int ext3_init_security(handle_t *handle, struct inode *inode,
				struct inode *dir);
#else
static inline int ext3_init_security(handle_t *handle, struct inode *inode,
				struct inode *dir)
{
	return 0;
}
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	File: fs/ext3/xattr.h
	3
	4	On-disk format of extended attributes for the ext3 filesystem.
	5
	6	(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
	7	*/
	8
1da177e4 LT	9	#include <linux/xattr.h>
	10
	11	/* Magic value in attribute blocks */
	12	#define EXT3_XATTR_MAGIC 0xEA020000
	13
	14	/* Maximum number of references to one attribute block */
	15	#define EXT3_XATTR_REFCOUNT_MAX 1024
	16
	17	/* Name indexes */
	18	#define EXT3_XATTR_INDEX_USER 1
	19	#define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS 2
	20	#define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT 3
	21	#define EXT3_XATTR_INDEX_TRUSTED 4
	22	#define EXT3_XATTR_INDEX_LUSTRE 5
	23	#define EXT3_XATTR_INDEX_SECURITY 6
	24
	25	struct ext3_xattr_header {
	26	__le32 h_magic; /* magic number for identification */
	27	__le32 h_refcount; /* reference count */
	28	__le32 h_blocks; /* number of disk blocks used */
	29	__le32 h_hash; /* hash value of all attributes */
	30	__u32 h_reserved[4]; /* zero right now */
	31	};
	32
	33	struct ext3_xattr_ibody_header {
	34	__le32 h_magic; /* magic number for identification */
	35	};
	36
	37	struct ext3_xattr_entry {
	38	__u8 e_name_len; /* length of name */
	39	__u8 e_name_index; /* attribute name index */
	40	__le16 e_value_offs; /* offset in disk block of value */
	41	__le32 e_value_block; /* disk block attribute is stored on (n/i) */
	42	__le32 e_value_size; /* size of attribute value */
	43	__le32 e_hash; /* hash value of name and value */
	44	char e_name[0]; /* attribute name */
	45	};
	46
	47	#define EXT3_XATTR_PAD_BITS 2
	48	#define EXT3_XATTR_PAD (1<<EXT3_XATTR_PAD_BITS)
	49	#define EXT3_XATTR_ROUND (EXT3_XATTR_PAD-1)
	50	#define EXT3_XATTR_LEN(name_len) \
	51	(((name_len) + EXT3_XATTR_ROUND + \
	52	sizeof(struct ext3_xattr_entry)) & ~EXT3_XATTR_ROUND)
	53	#define EXT3_XATTR_NEXT(entry) \
	54	( (struct ext3_xattr_entry *)( \
	55	(char *)(entry) + EXT3_XATTR_LEN((entry)->e_name_len)) )
	56	#define EXT3_XATTR_SIZE(size) \
	57	(((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND)
	58
	59	# ifdef CONFIG_EXT3_FS_XATTR
	60
d1f21049 SH	61	extern const struct xattr_handler ext3_xattr_user_handler;
	62	extern const struct xattr_handler ext3_xattr_trusted_handler;
	63	extern const struct xattr_handler ext3_xattr_acl_access_handler;
	64	extern const struct xattr_handler ext3_xattr_acl_default_handler;
	65	extern const struct xattr_handler ext3_xattr_security_handler;
1da177e4 LT	66
	67	extern ssize_t ext3_listxattr(struct dentry , char , size_t);
	68
	69	extern int ext3_xattr_get(struct inode , int, const char , void *, size_t);
1da177e4 LT	70	extern int ext3_xattr_set(struct inode , int, const char , const void *, size_t, int);
	71	extern int ext3_xattr_set_handle(handle_t , struct inode , int, const char , const void , size_t, int);
	72
	73	extern void ext3_xattr_delete_inode(handle_t , struct inode );
	74	extern void ext3_xattr_put_super(struct super_block *);
	75
	76	extern int init_ext3_xattr(void);
	77	extern void exit_ext3_xattr(void);
	78
d1f21049	79	extern const struct xattr_handler *ext3_xattr_handlers[];
1da177e4 LT	80
	81	# else /* CONFIG_EXT3_FS_XATTR */
	82
	83	static inline int
	84	ext3_xattr_get(struct inode inode, int name_index, const char name,
	85	void *buffer, size_t size, int flags)
	86	{
	87	return -EOPNOTSUPP;
	88	}
	89
1da177e4 LT	90	static inline int
	91	ext3_xattr_set(struct inode inode, int name_index, const char name,
	92	const void *value, size_t size, int flags)
	93	{
	94	return -EOPNOTSUPP;
	95	}
	96
	97	static inline int
	98	ext3_xattr_set_handle(handle_t handle, struct inode inode, int name_index,
	99	const char name, const void value, size_t size, int flags)
	100	{
	101	return -EOPNOTSUPP;
	102	}
	103
	104	static inline void
	105	ext3_xattr_delete_inode(handle_t handle, struct inode inode)
	106	{
	107	}
	108
	109	static inline void
	110	ext3_xattr_put_super(struct super_block *sb)
	111	{
	112	}
	113
	114	static inline int
	115	init_ext3_xattr(void)
	116	{
	117	return 0;
	118	}
	119
	120	static inline void
	121	exit_ext3_xattr(void)
	122	{
	123	}
	124
	125	#define ext3_xattr_handlers NULL
	126
	127	# endif /* CONFIG_EXT3_FS_XATTR */
ac50960a SS	128
	129	#ifdef CONFIG_EXT3_FS_SECURITY
	130	extern int ext3_init_security(handle_t handle, struct inode inode,
	131	struct inode *dir);
	132	#else
	133	static inline int ext3_init_security(handle_t handle, struct inode inode,
	134	struct inode *dir)
	135	{
	136	return 0;
	137	}
	138	#endif