tree af7b98d5ef57483cfac53cc4866194391c3ff7b7
parent 32fab448e5e86694beade415e750363538ea5f49
author Kiyoshi Ueda <k-ueda@ct.jp.nec.com> 1221749138 -0400
committer Jens Axboe <jens.axboe@oracle.com> 1223535378 +0200

block: add request submission interface

This patch adds blk_insert_cloned_request(), a generic request
submission interface for request stacking drivers.
Request-based dm will use it to submit their clones to underlying
devices.

blk_rq_check_limits() is also added because it is possible that
the lower queue has stronger limitations than the upper queue
if multiple drivers are stacking at request-level.
Not only for blk_insert_cloned_request()'s internal use, the function
will be used by request-based dm when the queue limitation is
modified (e.g. by replacing dm's table).

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>