tree 814820430d00128cb5f3fc0d44bb579c19d5d2a9
parent 2ac06c3332898103210b478c5a17c20e28929287
author raz ben yehuda <raziebe@gmail.com> 1245135725 +1000
committer NeilBrown <neilb@suse.de> 1245135725 +1000

md: raid0 :Enables chunk size other than powers of 2.

Maintain two flows, one for pow2 chunk sizes (which uses masks and
shift), and a flow for the general case (which uses sector_div).
This is for the sake of performance.

 - introduce map_sector and is_io_in_chunk_boundary to encapsulate
   those two flows better for raid0_make_request
 - fix blk_mergeable to support the two flows.

Signed-off-by: raziebe@gmail.com
Signed-off-by: NeilBrown <neilb@suse.de>