From 8a12c4a456c7ee261a85c2cbec835601e6aae05a Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Fri, 8 May 2009 11:54:02 +0900
Subject: [PATCH] hd: dequeue and track in-flight request

hd has at most single request in flight.  Till now, whenever it needs
to access the in-flight request it called elv_next_request().  This
patch makes hd track the in-flight request directly and dequeue it
when processing starts.  The added complexity is minimal and this will
help future block layer changes.

[ Impact: dequeue in-flight request, one elv_next_request() per request ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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