Commit 3a981b03 authored by NeilBrown's avatar NeilBrown
Browse files

md: when a level change reduces the number of devices, remove the excess. 



When an array is changed from RAID6 to RAID5, fewer drives are
needed.  So any device that is made superfluous by the level
conversion must be marked as not-active.
For the RAID6->RAID5 conversion, this will be a drive which only
has 'Q' blocks on it.

Cc: stable@kernel.org
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent ac5e7113

drivers/md/md.c

+7 −0
Original line number Diff line number Diff line
@@ -2695,6 +2695,7 @@ level_store(mddev_t *mddev, const char *buf, size_t len) 
	ssize_t rv = len;

	struct mdk_personality *pers;

	void *priv;

	mdk_rdev_t *rdev;



	if (mddev->pers == NULL) {

		if (len == 0)
@@ -2774,6 +2775,12 @@ level_store(mddev_t *mddev, const char *buf, size_t len) 
	mddev_suspend(mddev);

	mddev->pers->stop(mddev);

	module_put(mddev->pers->owner);

	/* Invalidate devices that are now superfluous */

	list_for_each_entry(rdev, &mddev->disks, same_set)

		if (rdev->raid_disk >= mddev->raid_disks) {

			rdev->raid_disk = -1;

			clear_bit(In_sync, &rdev->flags);

		}

	mddev->pers = pers;

	mddev->private = priv;

	strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));