NeilBrown eea136d69f
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 >
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