Commit bd18f646 authored by Shaohua Li's avatar Shaohua Li Committed by NeilBrown
Browse files

md: skip resync for raid array with journal 



If a raid array has journal, the journal can guarantee the consistency,
we can skip resync after a unclean shutdown. The exception is raid
creation or user initiated resync, which we still do a raid resync.

Signed-off-by: default avatarShaohua Li <shli@fb.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.com>
parent 828cbe98

drivers/md/md.c

+4 −0
Original line number Diff line number Diff line
@@ -1647,6 +1647,8 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) 
			}

			set_bit(Journal, &rdev->flags);

			rdev->journal_tail = le64_to_cpu(sb->journal_tail);

			if (mddev->recovery_cp == MaxSector)

				set_bit(MD_JOURNAL_CLEAN, &mddev->flags);

			break;

		default:

			rdev->saved_raid_disk = role;
@@ -1689,6 +1691,8 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) 
	sb->events = cpu_to_le64(mddev->events);

	if (mddev->in_sync)

		sb->resync_offset = cpu_to_le64(mddev->recovery_cp);

	else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags))

		sb->resync_offset = cpu_to_le64(MaxSector);

	else

		sb->resync_offset = cpu_to_le64(0);

drivers/md/md.h

+1 −0
Original line number Diff line number Diff line
@@ -232,6 +232,7 @@ struct mddev { 
#define MD_STILL_CLOSED	4	/* If set, then array has not been opened since

				 * md_ioctl checked on it.

				 */

#define MD_JOURNAL_CLEAN 5	/* A raid with journal is already clean */



	int				suspended;

	atomic_t			active_io;

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