Commit 7eb41885 authored by NeilBrown's avatar NeilBrown
Browse files

md: allow a partially recovered device to be hot-added to an array.

When adding a new device into an array it is normally important to
clear any stale data from ->recovery_offset else the new device may
not be recovered properly.

However when re-adding a device which is known to be nearly in-sync,
this is not needed and can be detrimental.  The (bitmap-based)
resync will still happen, and further recovery is only needed from
where-ever it was already up to.

So if save_raid_disk is set, signifying a re-add, don't clear

Signed-off-by: default avatarNeilBrown <>
parent f466722c
......@@ -7736,7 +7736,8 @@ static int remove_and_add_spares(struct mddev *mddev,
!test_bit(Bitmap_sync, &rdev->flags)))
rdev->recovery_offset = 0;
if (rdev->saved_raid_disk < 0)
rdev->recovery_offset = 0;
if (mddev->pers->
hot_add_disk(mddev, rdev) == 0) {
if (sysfs_link_rdev(mddev, rdev))
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