tree 8b5bff17f77c995099d93b2b4a32bc306962a0bf
parent 1e5554c8428bc7209a83e2d07ca724be4d981ce3
author Mikulas Patocka <mpatocka@redhat.com> 1281582831 +0100
committer Alasdair G Kergon <agk@redhat.com> 1281582831 +0100

dm snapshot: test chunk size against both origin and snapshot

Validate chunk size against both origin and snapshot sector size

Don't allow chunk size smaller than either origin or snapshot logical
sector size. Reading or writing data not aligned to sector size is not
allowed and causes immediate errors.

This requires us to open the origin before initialising the
exception store and to export dm_snap_origin.

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>