Commit eea136d6 authored Jun 26, 2013 by NeilBrown

md: fix buglet in RAID5 -> RAID0 conversion.



RAID5 uses a 'per-array' value for the 'size' of each device.
RAID0 uses a 'per-device' value - it can be different for each device.

When converting a RAID5 to a RAID0 we must ensure that the per-device
size of each device matches the per-array size for the RAID5, else
the array will change size.

If the metadata cannot record a changed per-device size (as is the
case with v0.90 metadata) the array could get bigger on restart.  This
does not cause data corruption, so it not a big issue and is mainly
yet another a reason to not use 0.90.

Signed-off-by: NeilBrown <neilb@suse.de>

parent 725d6e57

drivers/md/raid0.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -597,6 +597,7 @@ static void raid0_takeover_raid45(struct mddev mddev)
		mdname(mddev));
		return ERR_PTR(-EINVAL);
		}
		rdev->sectors = mddev->dev_sectors;
		}

		/* Set new parameters */