tree 1efd7430047b501cd9d5c234cc0ef329b39c2bd1
parent 8504eed3ac96457addfef7efc6aab2251073e8dc
author Jim Ramsay <jim_ramsay@dell.com> 1373496079 +0100
committer Alasdair G Kergon <agk@redhat.com> 1373496079 +0100

dm: add switch target

dm-switch is a new target that maps IO to underlying block devices
efficiently when there is a large number of fixed-sized address regions
but there is no simple pattern to allow for a compact mapping
representation such as dm-stripe.

Though we have developed this target for a specific storage device, Dell
EqualLogic, we have made an effort to keep it as general purpose as
possible in the hope that others may benefit.

Originally developed by Jim Ramsay. Simplified by Mikulas Patocka.

Signed-off-by: Jim Ramsay <jim_ramsay@dell.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>