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Commit 049d6c1e authored by Maciej Trela's avatar Maciej Trela Committed by NeilBrown
Browse files

md: enable raid4->raid0 takeover 



Only level 5 with layout=PARITY_N can be taken over to raid0 now.
Lets allow level 4 either.

Signed-off-by: default avatarMaciej Trela <maciej.trela@intel.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 001048a3

drivers/md/raid0.c

+6 −2
Original line number Diff line number Diff line
@@ -569,7 +569,7 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev) 
	return;

}



static void *raid0_takeover_raid5(mddev_t *mddev)

static void *raid0_takeover_raid45(mddev_t *mddev)

{

	mdk_rdev_t *rdev;

	raid0_conf_t *priv_conf;
@@ -647,12 +647,16 @@ static void *raid0_takeover_raid10(mddev_t *mddev) 
static void *raid0_takeover(mddev_t *mddev)

{

	/* raid0 can take over:

	 *  raid4 - if all data disks are active.

	 *  raid5 - providing it is Raid4 layout and one disk is faulty

	 *  raid10 - assuming we have all necessary active disks

	 */

	if (mddev->level == 4)

		return raid0_takeover_raid45(mddev);



	if (mddev->level == 5) {

		if (mddev->layout == ALGORITHM_PARITY_N)

			return raid0_takeover_raid5(mddev);

			return raid0_takeover_raid45(mddev);



		printk(KERN_ERR "md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n",

		       mdname(mddev), ALGORITHM_PARITY_N);