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md: skip resync for raid array with journal

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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: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Shaohua Li 2015-09-02 13:49:50 -07:00 committed by NeilBrown
parent 828cbe989e
commit bd18f6462f
2 changed files with 5 additions and 0 deletions
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4
drivers/md/md.c
View file

@ -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);

1
drivers/md/md.h
View file

@ -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;