/*
File: linux/ext2_xattr.h

On-disk format of extended attributes for the ext2 filesystem.

(C) 2001 Andreas Gruenbacher,
*/

#include #include

/* Magic value in attribute blocks */
#define EXT2_XATTR_MAGIC 0xEA020000

/* Maximum number of references to one attribute block */
#define EXT2_XATTR_REFCOUNT_MAX 1024

/* Name indexes */
#define EXT2_XATTR_INDEX_USER 1
#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2
#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3
#define EXT2_XATTR_INDEX_TRUSTED 4
#define EXT2_XATTR_INDEX_LUSTRE 5
#define EXT2_XATTR_INDEX_SECURITY 6

struct ext2_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 ext2_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 EXT2_XATTR_PAD_BITS 2
#define EXT2_XATTR_PAD (1< #define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1)
#define EXT2_XATTR_LEN(name_len) \
(((name_len) + EXT2_XATTR_ROUND + \
sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
#define EXT2_XATTR_NEXT(entry) \
( (struct ext2_xattr_entry *)( \
(char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
#define EXT2_XATTR_SIZE(size) \
(((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)

# ifdef CONFIG_EXT2_FS_XATTR

extern struct xattr_handler ext2_xattr_user_handler;
extern struct xattr_handler ext2_xattr_trusted_handler;
extern struct xattr_handler ext2_xattr_acl_access_handler;
extern struct xattr_handler ext2_xattr_acl_default_handler;
extern struct xattr_handler ext2_xattr_security_handler;

extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);

extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t);
extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int);

extern void ext2_xattr_delete_inode(struct inode *);
extern void ext2_xattr_put_super(struct super_block *);

extern int init_ext2_xattr(void);
extern void exit_ext2_xattr(void);

extern struct xattr_handler *ext2_xattr_handlers[];

# else /* CONFIG_EXT2_FS_XATTR */

static inline int
ext2_xattr_get(struct inode *inode, int name_index,
const char *name, void *buffer, size_t size)
{
return -EOPNOTSUPP;
}

static inline int
ext2_xattr_set(struct inode *inode, int name_index, const char *name,
const void *value, size_t size, int flags)
{
return -EOPNOTSUPP;
}

static inline void
ext2_xattr_delete_inode(struct inode *inode)
{
}

static inline void
ext2_xattr_put_super(struct super_block *sb)
{
}

static inline int
init_ext2_xattr(void)
{
return 0;
}

static inline void
exit_ext2_xattr(void)
{
}

#define ext2_xattr_handlers NULL

# endif /* CONFIG_EXT2_FS_XATTR */

#ifdef CONFIG_EXT2_FS_SECURITY
extern int ext2_init_security(struct inode *inode, struct inode *dir);
#else
static inline int ext2_init_security(struct inode *inode, struct inode *dir)
{
return 0;
}
#endif

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