4 On-disk format of extended attributes for the ext3 filesystem.
6 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
9 #include <linux/xattr.h>
11 /* Magic value in attribute blocks */
12 #define EXT3_XATTR_MAGIC 0xEA020000
14 /* Maximum number of references to one attribute block */
15 #define EXT3_XATTR_REFCOUNT_MAX 1024
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
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 */
33 struct ext3_xattr_ibody_header
{
34 __le32 h_magic
; /* magic number for identification */
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 */
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)
59 # ifdef CONFIG_EXT3_FS_XATTR
61 extern struct xattr_handler ext3_xattr_user_handler
;
62 extern struct xattr_handler ext3_xattr_trusted_handler
;
63 extern struct xattr_handler ext3_xattr_acl_access_handler
;
64 extern struct xattr_handler ext3_xattr_acl_default_handler
;
65 extern struct xattr_handler ext3_xattr_security_handler
;
67 extern ssize_t
ext3_listxattr(struct dentry
*, char *, size_t);
69 extern int ext3_xattr_get(struct inode
*, int, const char *, void *, size_t);
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);
73 extern void ext3_xattr_delete_inode(handle_t
*, struct inode
*);
74 extern void ext3_xattr_put_super(struct super_block
*);
76 extern int init_ext3_xattr(void);
77 extern void exit_ext3_xattr(void);
79 extern struct xattr_handler
*ext3_xattr_handlers
[];
81 # else /* CONFIG_EXT3_FS_XATTR */
84 ext3_xattr_get(struct inode
*inode
, int name_index
, const char *name
,
85 void *buffer
, size_t size
, int flags
)
91 ext3_xattr_set(struct inode
*inode
, int name_index
, const char *name
,
92 const void *value
, size_t size
, int flags
)
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
)
105 ext3_xattr_delete_inode(handle_t
*handle
, struct inode
*inode
)
110 ext3_xattr_put_super(struct super_block
*sb
)
115 init_ext3_xattr(void)
121 exit_ext3_xattr(void)
125 #define ext3_xattr_handlers NULL
127 # endif /* CONFIG_EXT3_FS_XATTR */
129 #ifdef CONFIG_EXT3_FS_SECURITY
130 extern int ext3_init_security(handle_t
*handle
, struct inode
*inode
,
133 static inline int ext3_init_security(handle_t
*handle
, struct inode
*inode
,