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/* SPDX-License-Identifier: GPL-2.0 */
/*
File: linux/ext2_xattr.h
On-disk format of extended attributes for the ext2 filesystem.
(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/
#include <linux/init.h>
#include <linux/xattr.h>
/* 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[]; /* attribute name */
};
#define EXT2_XATTR_PAD_BITS 2
#define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS)
#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)
struct mb_cache;
# ifdef CONFIG_EXT2_FS_XATTR
extern const struct xattr_handler ext2_xattr_user_handler;
extern const struct xattr_handler ext2_xattr_trusted_handler;
extern const 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 struct mb_cache *ext2_xattr_create_cache(void);
extern void ext2_xattr_destroy_cache(struct mb_cache *cache);
extern const struct xattr_handler * const 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_destroy_cache(struct mb_cache *cache)
{
}
#define ext2_xattr_handlers NULL
#define ext2_listxattr NULL
# endif /* CONFIG_EXT2_FS_XATTR */
#ifdef CONFIG_EXT2_FS_SECURITY
extern int ext2_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr);
#else
static inline int ext2_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr)
{
return 0;
}
#endif
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