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@xxxxxx>
---
drivers/md/md.c | 4 ++++
drivers/md/md.h | 1 +
2 files changed, 5 insertions(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index b3f9eed..95824fb 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1669,6 +1669,8 @@ 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;
@@ -1711,6 +1713,8 @@ 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);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 226f4ba..0288a0b 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -236,6 +236,7 @@ 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;
--
1.8.1
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