From: NeilBrown Date: Mon, 5 Mar 2007 08:30:44 +0000 (-0800) Subject: [PATCH] md: fix for raid6 reshape X-Git-Tag: v2.6.21-rc3~72 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=6d3baf2eb8bd680b2d4f509bc3dbf4dcd6e27a40;p=linux-2.6-omap-h63xx.git [PATCH] md: fix for raid6 reshape Recent patch for raid6 reshape had a change missing that showed up in subsequent review. Many places in the raid5 code used "conf->raid_disks-1" to mean "number of data disks". With raid6 that had to be changed to "conf->raid_disk - conf->max_degraded" or similar. One place was missed. This bug means that if a raid6 reshape were aborted in the middle the recorded position would be wrong. On restart it would either fail (as the position wasn't on an appropriate boundary) or would leave a section of the array unreshaped, causing data corruption. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index d247429ee5e..54a1ad5eef4 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3071,7 +3071,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped release_stripe(sh); } spin_lock_irq(&conf->device_lock); - conf->expand_progress = (sector_nr + i)*(conf->raid_disks-1); + conf->expand_progress = (sector_nr + i) * new_data_disks; spin_unlock_irq(&conf->device_lock); /* Ok, those stripe are ready. We can start scheduling * reads on the source stripes.