tree e6f2d8b7d9808cfbfb0b67a088b182776518a797
parent 9d74e25737d73e93ccddeb5a61bcd56b7b8eb57b
author Christoph Hellwig <hch@lst.de> 1397464208 +0200
committer Jens Axboe <axboe@fb.com> 1397592182 -0600

blk-mq: make ->flush_rq fully transparent to drivers

Drivers shouldn't have to care about the block layer setting aside a
request to implement the flush state machine.  We already override the
mq context and tag to make it more transparent, but so far haven't deal
with the driver private data in the request.  Make sure to override this
as well, and while we're at it add a proper helper sitting in blk-mq.c
that implements the full impersonation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>