1/* vi: set sw=4 ts=4: */ 2/* 3 File: linux/ext2_ext_attr.h 4 5 On-disk format of extended attributes for the ext2 filesystem. 6 7 (C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org> 8*/ 9 10/* Magic value in attribute blocks */ 11#define EXT2_EXT_ATTR_MAGIC_v1 0xEA010000 12#define EXT2_EXT_ATTR_MAGIC 0xEA020000 13 14/* Maximum number of references to one attribute block */ 15#define EXT2_EXT_ATTR_REFCOUNT_MAX 1024 16 17struct ext2_ext_attr_header { 18 __u32 h_magic; /* magic number for identification */ 19 __u32 h_refcount; /* reference count */ 20 __u32 h_blocks; /* number of disk blocks used */ 21 __u32 h_hash; /* hash value of all attributes */ 22 __u32 h_reserved[4]; /* zero right now */ 23}; 24 25struct ext2_ext_attr_entry { 26 __u8 e_name_len; /* length of name */ 27 __u8 e_name_index; /* attribute name index */ 28 __u16 e_value_offs; /* offset in disk block of value */ 29 __u32 e_value_block; /* disk block attribute is stored on (n/i) */ 30 __u32 e_value_size; /* size of attribute value */ 31 __u32 e_hash; /* hash value of name and value */ 32}; 33 34#define EXT2_EXT_ATTR_PAD_BITS 2 35#define EXT2_EXT_ATTR_PAD (1<<EXT2_EXT_ATTR_PAD_BITS) 36#define EXT2_EXT_ATTR_ROUND (EXT2_EXT_ATTR_PAD-1) 37#define EXT2_EXT_ATTR_LEN(name_len) \ 38 (((name_len) + EXT2_EXT_ATTR_ROUND + \ 39 sizeof(struct ext2_ext_attr_entry)) & ~EXT2_EXT_ATTR_ROUND) 40#define EXT2_EXT_ATTR_NEXT(entry) \ 41 ( (struct ext2_ext_attr_entry *)( \ 42 (char *)(entry) + EXT2_EXT_ATTR_LEN((entry)->e_name_len)) ) 43#define EXT2_EXT_ATTR_SIZE(size) \ 44 (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND) 45#define EXT2_EXT_IS_LAST_ENTRY(entry) (*((__u32 *)(entry)) == 0UL) 46#define EXT2_EXT_ATTR_NAME(entry) \ 47 (((char *) (entry)) + sizeof(struct ext2_ext_attr_entry)) 48#define EXT2_XATTR_LEN(name_len) \ 49 (((name_len) + EXT2_EXT_ATTR_ROUND + \ 50 sizeof(struct ext2_xattr_entry)) & ~EXT2_EXT_ATTR_ROUND) 51#define EXT2_XATTR_SIZE(size) \ 52 (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND) 53