構造体定義書 - journal

struct journal_params

No.	名称	属性	説明
1	journal_params
	jp_journal_1st_block	__u32	where does journal start from on its
	jp_journal_dev	__u32	journal device st_rdev
	jp_journal_size	__u32	size of the journal on FS creation. used to
	jp_journal_trans_max	__u32	max number of blocks in a transaction.
	jp_journal_magic	__u32	random value made on fs creation (this was
	jp_journal_max_batch	__u32	max number of blocks to batch into a trans
	jp_journal_max_commit_age	__u32	in seconds, how old can an async commit be
	jp_journal_max_trans_age	__u32	in seconds, how old can a transaction be

journal_params