138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
/*
|
|
File: fs/ext4/xattr.h
|
|
|
|
On-disk format of extended attributes for the ext4 filesystem.
|
|
|
|
(C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
|
|
*/
|
|
|
|
#include <linux/xattr.h>
|
|
|
|
/* Magic value in attribute blocks */
|
|
#define EXT4_XATTR_MAGIC 0xEA020000
|
|
|
|
/* Maximum number of references to one attribute block */
|
|
#define EXT4_XATTR_REFCOUNT_MAX 1024
|
|
|
|
/* Name indexes */
|
|
#define EXT4_XATTR_INDEX_USER 1
|
|
#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
|
|
#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
|
|
#define EXT4_XATTR_INDEX_TRUSTED 4
|
|
#define EXT4_XATTR_INDEX_LUSTRE 5
|
|
#define EXT4_XATTR_INDEX_SECURITY 6
|
|
#define EXT4_XATTR_INDEX_SYSTEM 7
|
|
|
|
struct ext4_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 */
|
|
__le32 h_checksum; /* crc32c(uuid+id+xattrblock) */
|
|
/* id = inum if refcount=1, blknum otherwise */
|
|
__u32 h_reserved[3]; /* zero right now */
|
|
};
|
|
|
|
struct ext4_xattr_ibody_header {
|
|
__le32 h_magic; /* magic number for identification */
|
|
};
|
|
|
|
struct ext4_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 EXT4_XATTR_PAD_BITS 2
|
|
#define EXT4_XATTR_PAD (1<<EXT4_XATTR_PAD_BITS)
|
|
#define EXT4_XATTR_ROUND (EXT4_XATTR_PAD-1)
|
|
#define EXT4_XATTR_LEN(name_len) \
|
|
(((name_len) + EXT4_XATTR_ROUND + \
|
|
sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)
|
|
#define EXT4_XATTR_NEXT(entry) \
|
|
((struct ext4_xattr_entry *)( \
|
|
(char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))
|
|
#define EXT4_XATTR_SIZE(size) \
|
|
(((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
|
|
|
|
#define IHDR(inode, raw_inode) \
|
|
((struct ext4_xattr_ibody_header *) \
|
|
((void *)raw_inode + \
|
|
EXT4_GOOD_OLD_INODE_SIZE + \
|
|
EXT4_I(inode)->i_extra_isize))
|
|
#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
|
|
|
|
#define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
|
|
#define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
|
|
#define BFIRST(bh) ENTRY(BHDR(bh)+1)
|
|
#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
|
|
|
|
#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
|
|
|
|
struct ext4_xattr_info {
|
|
int name_index;
|
|
const char *name;
|
|
const void *value;
|
|
size_t value_len;
|
|
};
|
|
|
|
struct ext4_xattr_search {
|
|
struct ext4_xattr_entry *first;
|
|
void *base;
|
|
void *end;
|
|
struct ext4_xattr_entry *here;
|
|
int not_found;
|
|
};
|
|
|
|
struct ext4_xattr_ibody_find {
|
|
struct ext4_xattr_search s;
|
|
struct ext4_iloc iloc;
|
|
};
|
|
|
|
extern const struct xattr_handler ext4_xattr_user_handler;
|
|
extern const struct xattr_handler ext4_xattr_trusted_handler;
|
|
extern const struct xattr_handler ext4_xattr_acl_access_handler;
|
|
extern const struct xattr_handler ext4_xattr_acl_default_handler;
|
|
extern const struct xattr_handler ext4_xattr_security_handler;
|
|
|
|
extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);
|
|
|
|
extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
|
|
extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
|
|
extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
|
|
|
|
extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
|
|
extern void ext4_xattr_put_super(struct super_block *);
|
|
|
|
extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
|
|
struct ext4_inode *raw_inode, handle_t *handle);
|
|
|
|
extern int __init ext4_init_xattr(void);
|
|
extern void ext4_exit_xattr(void);
|
|
|
|
extern const struct xattr_handler *ext4_xattr_handlers[];
|
|
|
|
extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
|
|
struct ext4_xattr_ibody_find *is);
|
|
extern int ext4_xattr_ibody_get(struct inode *inode, int name_index,
|
|
const char *name,
|
|
void *buffer, size_t buffer_size);
|
|
extern int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
|
|
struct ext4_xattr_info *i,
|
|
struct ext4_xattr_ibody_find *is);
|
|
|
|
#ifdef CONFIG_EXT4_FS_SECURITY
|
|
extern int ext4_init_security(handle_t *handle, struct inode *inode,
|
|
struct inode *dir, const struct qstr *qstr);
|
|
#else
|
|
static inline int ext4_init_security(handle_t *handle, struct inode *inode,
|
|
struct inode *dir, const struct qstr *qstr)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|