| /* vi: set sw=4 ts=4: */ |
| /* |
| File: linux/ext2_ext_attr.h |
| |
| On-disk format of extended attributes for the ext2 filesystem. |
| |
| (C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| */ |
| |
| /* Magic value in attribute blocks */ |
| #define EXT2_EXT_ATTR_MAGIC_v1 0xEA010000 |
| #define EXT2_EXT_ATTR_MAGIC 0xEA020000 |
| |
| /* Maximum number of references to one attribute block */ |
| #define EXT2_EXT_ATTR_REFCOUNT_MAX 1024 |
| |
| struct ext2_ext_attr_header { |
| __u32 h_magic; /* magic number for identification */ |
| __u32 h_refcount; /* reference count */ |
| __u32 h_blocks; /* number of disk blocks used */ |
| __u32 h_hash; /* hash value of all attributes */ |
| __u32 h_reserved[4]; /* zero right now */ |
| }; |
| |
| struct ext2_ext_attr_entry { |
| __u8 e_name_len; /* length of name */ |
| __u8 e_name_index; /* attribute name index */ |
| __u16 e_value_offs; /* offset in disk block of value */ |
| __u32 e_value_block; /* disk block attribute is stored on (n/i) */ |
| __u32 e_value_size; /* size of attribute value */ |
| __u32 e_hash; /* hash value of name and value */ |
| }; |
| |
| #define EXT2_EXT_ATTR_PAD_BITS 2 |
| #define EXT2_EXT_ATTR_PAD (1<<EXT2_EXT_ATTR_PAD_BITS) |
| #define EXT2_EXT_ATTR_ROUND (EXT2_EXT_ATTR_PAD-1) |
| #define EXT2_EXT_ATTR_LEN(name_len) \ |
| (((name_len) + EXT2_EXT_ATTR_ROUND + \ |
| sizeof(struct ext2_ext_attr_entry)) & ~EXT2_EXT_ATTR_ROUND) |
| #define EXT2_EXT_ATTR_NEXT(entry) \ |
| ( (struct ext2_ext_attr_entry *)( \ |
| (char *)(entry) + EXT2_EXT_ATTR_LEN((entry)->e_name_len)) ) |
| #define EXT2_EXT_ATTR_SIZE(size) \ |
| (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND) |
| #define EXT2_EXT_IS_LAST_ENTRY(entry) (*((__u32 *)(entry)) == 0UL) |
| #define EXT2_EXT_ATTR_NAME(entry) \ |
| (((char *) (entry)) + sizeof(struct ext2_ext_attr_entry)) |
| #define EXT2_XATTR_LEN(name_len) \ |
| (((name_len) + EXT2_EXT_ATTR_ROUND + \ |
| sizeof(struct ext2_xattr_entry)) & ~EXT2_EXT_ATTR_ROUND) |
| #define EXT2_XATTR_SIZE(size) \ |
| (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND) |
