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md: allow re-add to failed arrays. 

When an array is failed (some data inaccessible) then there is no
point attempting to add a spare as it could not possibly be recovered.

However that may be value in re-adding a recently removed device.
e.g. if there is a write-intent-bitmap and it is clear, then access
to the data could be restored by this action.

So don't reject a re-add to a failed array for RAID10 and RAID5 (the
only arrays  types that check for a failed array).

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-03-19 12:46:37 +11:00
parent 41fe75f60b
commit dc10c643e8
2 changed files with 2 additions and 2 deletions
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2
drivers/md/raid10.c
View File

@ -1483,7 +1483,7 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
* very different from resync * very different from resync
*/ */
return -EBUSY; return -EBUSY;
if (!enough(conf, -1)) if (rdev->saved_raid_disk < 0 && !enough(conf, -1))
return -EINVAL; return -EINVAL;
if (rdev->raid_disk >= 0) if (rdev->raid_disk >= 0)

2
drivers/md/raid5.c
View File

@ -5361,7 +5361,7 @@ static int raid5_add_disk(struct mddev *mddev, struct md_rdev *rdev)
if (mddev->recovery_disabled == conf->recovery_disabled) if (mddev->recovery_disabled == conf->recovery_disabled)
return -EBUSY; return -EBUSY;
if (has_failed(conf)) if (rdev->saved_raid_disk < 0 && has_failed(conf))
/* no point adding a device */ /* no point adding a device */
return -EINVAL; return -EINVAL;