tree 19e9c438300cfee59abc6e499ab6bfaa872a9de5
parent 599cdf3bfbe21fe94f4416c9e54363b285c9532a
author Mikulas Patocka <mpatocka@redhat.com> 1394836987 -0400
committer Mike Snitzer <snitzer@redhat.com> 1401817447 -0400

dm snapshot: do not split read bios sent to snapshot-origin target

Change the snapshot-origin target so that only write bios are split on
chunk boundary.  Read bios are passed unchanged to the underlying
device, so they don't have to be split.

Later, we could change the target so that it accepts a larger write bio
if it spans an area that is completely covered by snapshot exceptions.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>