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Commit ae4647fb authored by Jan Kara's avatar Jan Kara Committed by Theodore Ts'o
Browse files

jbd2: reduce journal_head size 



Remove unused t_cow_tid field (ext4 copy-on-write support doesn't seem
to be happening) and change b_modified and b_jlist to bitfields thus
saving 8 bytes in the structure.

Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: default avatarZheng Liu <wenqing.lz@taobao.com>
parent 7b001d6a

include/linux/journal-head.h

+2 −9
Original line number Diff line number Diff line
@@ -31,21 +31,14 @@ struct journal_head { 
	/*

	 * Journalling list for this buffer [jbd_lock_bh_state()]

	 */

	unsigned b_jlist;

	unsigned b_jlist:4;



	/*

	 * This flag signals the buffer has been modified by

	 * the currently running transaction

	 * [jbd_lock_bh_state()]

	 */

	unsigned b_modified;



	/*

	 * This feild tracks the last transaction id in which this buffer

	 * has been cowed

	 * [jbd_lock_bh_state()]

	 */

	tid_t b_cow_tid;

	unsigned b_modified:1;



	/*

	 * Copy of the buffer data frozen for writing to the log.