From 53a6ab4d3f6d6dc87ec8f14998b4b5536ee2968c Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 12 Feb 2015 14:09:57 +1100 Subject: [PATCH] md/raid10: fix conversion from RAID0 to RAID10 A RAID0 array (like a LINEAR array) does not have a concept of 'size' being the amount of each device that is in use. Rather, as much of each device as is available is used. So the 'size' is set to 0 and ignored. RAID10 does have this concept and needs it to be set correctly. So when we convert RAID0 to RAID10 we must determine the 'size' (that being the size of the first 'strip_zone' in the RAID0), and set it correctly. Reported-and-tested-by: Xiao Ni Signed-off-by: NeilBrown --- drivers/md/raid10.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index d1203cd..b8d76b1 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3872,7 +3872,7 @@ static int raid10_resize(struct mddev *mddev, sector_t sectors) return 0; } -static void *raid10_takeover_raid0(struct mddev *mddev) +static void *raid10_takeover_raid0(struct mddev *mddev, sector_t size, int devs) { struct md_rdev *rdev; struct r10conf *conf; @@ -3882,6 +3882,7 @@ static void *raid10_takeover_raid0(struct mddev *mddev) mdname(mddev)); return ERR_PTR(-EINVAL); } + sector_div(size, devs); /* Set new parameters */ mddev->new_level = 10; @@ -3892,12 +3893,15 @@ static void *raid10_takeover_raid0(struct mddev *mddev) mddev->raid_disks *= 2; /* make sure it will be not marked as dirty */ mddev->recovery_cp = MaxSector; + mddev->dev_sectors = size; conf = setup_conf(mddev); if (!IS_ERR(conf)) { rdev_for_each(rdev, mddev) - if (rdev->raid_disk >= 0) + if (rdev->raid_disk >= 0) { rdev->new_raid_disk = rdev->raid_disk * 2; + rdev->sectors = size; + } conf->barrier = 1; } @@ -3920,7 +3924,9 @@ static void *raid10_takeover(struct mddev *mddev) mdname(mddev)); return ERR_PTR(-EINVAL); } - return raid10_takeover_raid0(mddev); + return raid10_takeover_raid0(mddev, + raid0_conf->strip_zone->zone_end, + raid0_conf->strip_zone->nb_dev); } return ERR_PTR(-EINVAL); } -- 2.7.4