From 049d6c1ef983c9ac43aa423dfd752071a5b0002d Mon Sep 17 00:00:00 2001 From: Maciej Trela Date: Wed, 16 Jun 2010 11:56:12 +0100 Subject: [PATCH] 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: Maciej Trela Signed-off-by: NeilBrown --- drivers/md/raid0.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index ac09b7d..563abed 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -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); -- 2.7.4