From: Martin Wilck <mwilck@xxxxxxxx>
When an array is assembled incrementally with mdadm -I -R
and the array switches to "active" mode, md starts a recovery.
If the array was clean, the "fullsync" flag will be 0. Skip
the full recovery in this case, as RAID1 does (the code was
actually copied from the sync_request() method of RAID1).
---
drivers/md/raid10.c | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 64d4824..e373d88 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2863,6 +2863,22 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
if (init_resync(conf))
return 0;
+ /*
+ * Allow skipping a full rebuild for incremental assembly
+ * of a clean array, like RAID1 does.
+ */
+ if (mddev->bitmap == NULL &&
+ mddev->recovery_cp == MaxSector &&
+ !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
+ conf->fullsync == 0) {
+ *skipped = 1;
+ max_sector = mddev->dev_sectors;
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
+ test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
+ max_sector = mddev->resync_max_sectors;
+ return max_sector - sector_nr;
+ }
+
skipped:
max_sector = mddev->dev_sectors;
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
--
1.7.1
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