構造体定義書

struct item_head

No.	名称	属性	説明
1	item_head
	ih_key	key	Everything in the tree is found by searching for it
	ih2_free_space	__u16	The free space in the last unformatted node
	ih2_entry_count	__u16	Iff this is a directory item, this field
	u	} __attribute__ ((__packed__))
	ih2_item_len	__u16	total size of the item body
	ih2_item_location	__u16	an offset to the item body within the
	ih_format	__u16	key format is stored in bits 0-11 of this item
	key_format	__u16	KEY_FORMAT_1 or KEY_FORMAT_2. This is not
	flags	__u16	fsck set here its flag (reachable/unreachable)
	ih2_format	} __attribute__ ((__packed__))

item_head