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md/raid10: Allow skipping recovery when clean arrays are assembled 

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).

Signed-off-by: Martin Wilck <mwilck@arcor.de>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Martin Wilck 2013-04-24 11:42:42 +10:00 committed by NeilBrown
parent b6fec069af
commit 7e83ccbecd
1 changed files with 16 additions and 0 deletions
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16
drivers/md/raid10.c
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@ -2913,6 +2913,22 @@ 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) ||