+/* Extended Attribute(EA) */
+
+/* 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
+#define EXT4_XATTR_INDEX_RICHACL 8
+#define EXT4_XATTR_INDEX_ENCRYPTION 9
+
+#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 EXT4_XATTR_NAME(entry) ((char *)((entry) + 1))
+
+#define EXT4_XATTR_IHDR(sb, raw_inode) \
+ ((struct ext4_xattr_ibody_header *)((char *)raw_inode + \
+ EXT4_GOOD_OLD_INODE_SIZE + \
+ ext4_inode_get_extra_isize( \
+ sb, raw_inode)))
+#define EXT4_XATTR_IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr) + 1))
+
+#define EXT4_XATTR_BHDR(block) ((struct ext4_xattr_header *)((block)->data))
+#define EXT4_XATTR_ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
+#define EXT4_XATTR_BFIRST(block) EXT4_XATTR_ENTRY(EXT4_XATTR_BHDR(block) + 1)
+#define EXT4_XATTR_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
+
+#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
+
+#pragma pack(push, 1)
+
+struct ext4_xattr_header {
+ uint32_t h_magic; /* magic number for identification */
+ uint32_t h_refcount; /* reference count */
+ uint32_t h_blocks; /* number of disk blocks used */
+ uint32_t h_hash; /* hash value of all attributes */
+ uint32_t h_checksum; /* crc32c(uuid+id+xattrblock) */
+ /* id = inum if refcount=1, blknum otherwise */
+ uint32_t h_reserved[3]; /* zero right now */
+};
+
+struct ext4_xattr_ibody_header {
+ uint32_t h_magic; /* magic number for identification */
+};
+
+struct ext4_xattr_entry {
+ uint8_t e_name_len; /* length of name */
+ uint8_t e_name_index; /* attribute name index */
+ uint16_t e_value_offs; /* offset in disk block of value */
+ uint32_t e_value_block; /* disk block attribute is stored on (n/i) */
+ uint32_t e_value_size; /* size of attribute value */
+ uint32_t e_hash; /* hash value of name and value */
+};
+
+#pragma pack(pop)
+
+