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ext2_ext_attr.h
/* File: linux/ext2_ext_attr.h On-disk format of extended attributes for the ext2 filesystem. (C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org> */ #ifndef _EXT2_EXT_ATTR_H #define _EXT2_EXT_ATTR_H /* 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_checksum; /* crc32c(uuid+id+xattrs) */ /* id = inum if refcount = 1, else blknum */ __u32 h_reserved[3]; /* 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_inum; /* inode in which the value is stored */ __u32 e_value_size; /* size of attribute value */ __u32 e_hash; /* hash value of name and value */ #if 0 char e_name[0]; /* attribute name */ #endif }; #define EXT2_EXT_ATTR_PAD_BITS 2 #define EXT2_EXT_ATTR_PAD ((unsigned) 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) #ifdef __KERNEL__ # ifdef CONFIG_EXT2_FS_EXT_ATTR extern int ext2_get_ext_attr(struct inode *, const char *, char *, size_t, int); extern int ext2_set_ext_attr(struct inode *, const char *, char *, size_t, int); extern void ext2_ext_attr_free_inode(struct inode *inode); extern void ext2_ext_attr_put_super(struct super_block *sb); extern int ext2_ext_attr_init(void); extern void ext2_ext_attr_done(void); # else # define ext2_get_ext_attr NULL # define ext2_set_ext_attr NULL # endif #endif /* __KERNEL__ */ #endif /* _EXT2_EXT_ATTR_H */
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