[linux.git] / fs / ext3 / xattr.h

/*
  File: fs/ext3/xattr.h

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

  (C) 2001 Andreas Gruenbacher, <[email protected]>
*/

#include <linux/config.h>
#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 struct xattr_handler ext3_xattr_user_handler;
extern struct xattr_handler ext3_xattr_trusted_handler;
extern struct xattr_handler ext3_xattr_acl_access_handler;
extern struct xattr_handler ext3_xattr_acl_default_handler;
extern 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_list(struct inode *, char *, 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 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_list(struct inode *inode, void *buffer, size_t size)
{
	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, <[email protected]>
	7	*/
	8
	9	#include <linux/config.h>
	10	#include <linux/xattr.h>
	11
	12	/* Magic value in attribute blocks */
	13	#define EXT3_XATTR_MAGIC 0xEA020000
	14
	15	/* Maximum number of references to one attribute block */
	16	#define EXT3_XATTR_REFCOUNT_MAX 1024
	17
	18	/* Name indexes */
	19	#define EXT3_XATTR_INDEX_USER 1
	20	#define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS 2
	21	#define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT 3
	22	#define EXT3_XATTR_INDEX_TRUSTED 4
	23	#define EXT3_XATTR_INDEX_LUSTRE 5
	24	#define EXT3_XATTR_INDEX_SECURITY 6
	25
	26	struct ext3_xattr_header {
	27	__le32 h_magic; /* magic number for identification */
	28	__le32 h_refcount; /* reference count */
	29	__le32 h_blocks; /* number of disk blocks used */
	30	__le32 h_hash; /* hash value of all attributes */
	31	__u32 h_reserved[4]; /* zero right now */
	32	};
	33
	34	struct ext3_xattr_ibody_header {
	35	__le32 h_magic; /* magic number for identification */
	36	};
	37
	38	struct ext3_xattr_entry {
	39	__u8 e_name_len; /* length of name */
	40	__u8 e_name_index; /* attribute name index */
	41	__le16 e_value_offs; /* offset in disk block of value */
	42	__le32 e_value_block; /* disk block attribute is stored on (n/i) */
	43	__le32 e_value_size; /* size of attribute value */
	44	__le32 e_hash; /* hash value of name and value */
	45	char e_name[0]; /* attribute name */
	46	};
	47
	48	#define EXT3_XATTR_PAD_BITS 2
	49	#define EXT3_XATTR_PAD (1<<EXT3_XATTR_PAD_BITS)
	50	#define EXT3_XATTR_ROUND (EXT3_XATTR_PAD-1)
	51	#define EXT3_XATTR_LEN(name_len) \
	52	(((name_len) + EXT3_XATTR_ROUND + \
	53	sizeof(struct ext3_xattr_entry)) & ~EXT3_XATTR_ROUND)
	54	#define EXT3_XATTR_NEXT(entry) \
	55	( (struct ext3_xattr_entry *)( \
	56	(char *)(entry) + EXT3_XATTR_LEN((entry)->e_name_len)) )
	57	#define EXT3_XATTR_SIZE(size) \
	58	(((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND)
	59
	60	# ifdef CONFIG_EXT3_FS_XATTR
	61
	62	extern struct xattr_handler ext3_xattr_user_handler;
	63	extern struct xattr_handler ext3_xattr_trusted_handler;
	64	extern struct xattr_handler ext3_xattr_acl_access_handler;
65	extern struct xattr_handler ext3_xattr_acl_default_handler;
66	extern struct xattr_handler ext3_xattr_security_handler;
67
68	extern ssize_t ext3_listxattr(struct dentry , char , size_t);
69
70	extern int ext3_xattr_get(struct inode , int, const char , void *, size_t);
71	extern int ext3_xattr_list(struct inode , char , size_t);
72	extern int ext3_xattr_set(struct inode , int, const char , const void *, size_t, int);
73	extern int ext3_xattr_set_handle(handle_t , struct inode , int, const char , const void , size_t, int);
74
75	extern void ext3_xattr_delete_inode(handle_t , struct inode );
76	extern void ext3_xattr_put_super(struct super_block *);
77
78	extern int init_ext3_xattr(void);
79	extern void exit_ext3_xattr(void);
80
81	extern struct xattr_handler *ext3_xattr_handlers[];
82
83	# else /* CONFIG_EXT3_FS_XATTR */
84
85	static inline int
86	ext3_xattr_get(struct inode inode, int name_index, const char name,
87	void *buffer, size_t size, int flags)
88	{
89	return -EOPNOTSUPP;
90	}
91
92	static inline int
93	ext3_xattr_list(struct inode inode, void buffer, size_t size)
94	{
95	return -EOPNOTSUPP;
96	}
97
98	static inline int
99	ext3_xattr_set(struct inode inode, int name_index, const char name,
100	const void *value, size_t size, int flags)
101	{
102	return -EOPNOTSUPP;
103	}
104
105	static inline int
106	ext3_xattr_set_handle(handle_t handle, struct inode inode, int name_index,
107	const char name, const void value, size_t size, int flags)
108	{
109	return -EOPNOTSUPP;
110	}
111
112	static inline void
113	ext3_xattr_delete_inode(handle_t handle, struct inode inode)
114	{
115	}
116
117	static inline void
118	ext3_xattr_put_super(struct super_block *sb)
119	{
120	}
121
122	static inline int
123	init_ext3_xattr(void)
124	{
125	return 0;
126	}
127
128	static inline void
129	exit_ext3_xattr(void)
130	{
131	}
132
133	#define ext3_xattr_handlers NULL
134
135	# endif /* CONFIG_EXT3_FS_XATTR */
ac50960a SS	136
	137	#ifdef CONFIG_EXT3_FS_SECURITY
	138	extern int ext3_init_security(handle_t handle, struct inode inode,
	139	struct inode *dir);
	140	#else
	141	static inline int ext3_init_security(handle_t handle, struct inode inode,
	142	struct inode *dir)
	143	{
	144	return 0;
	145	}
	146	#endif