tree c434fd684132ae502880dc745b1982fc3ca94db0
parent 6bbf79a14080a0c61212f53b4b87dc1a99fedf9c
author Mikulas Patocka <mpatocka@redhat.com> 1281582830 +0100
committer Alasdair G Kergon <agk@redhat.com> 1281582830 +0100

dm snapshot: iterate origin and cow devices

Iterate both origin and snapshot devices

iterate_devices method should call the callback for all the devices where
the bio may be remapped. Thus, snapshot_iterate_devices should call the callback
for both snapshot and origin underlying devices because it remaps some bios
to the snapshot and some to the origin.

snapshot_iterate_devices called the callback only for the origin device.
This led to badly calculated device limits if snapshot and origin were placed
on different types of disks.

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>