commit 414b4ff5eecff0097d09c4a7da12e435fd503692
author Tejun Heo <tj@kernel.org> Tue Jan 25 12:43:49 2011 +0100
committer Jens Axboe <jaxboe@fusionio.com> Tue Jan 25 12:43:49 2011 +0100
tree cc7cd46c1455712af672b3ff872800b3da895837
parent 3c0eee3fe6a3a1c745379547c7e7c904aa64f6d5

block: add REQ_FLUSH_SEQ

rq == &q->flush_rq was used to determine whether a rq is part of a
flush sequence, which worked because all requests in a flush sequence
were sequenced using the single dedicated request.  This is about to
change, so introduce REQ_FLUSH_SEQ flag to distinguish flush sequence
requests.

This patch doesn't cause any behavior change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>