From 2230237500821aedfcf2bba2a79d9cbca389233c Mon Sep 17 00:00:00 2001
From: Shaohua Li <shli@kernel.org>
Date: Fri, 30 May 2014 08:06:42 -0600
Subject: [PATCH] blk-mq: blk_mq_tag_to_rq should handle flush request

flush request is special, which borrows the tag from the parent
request. Hence blk_mq_tag_to_rq needs special handling to return
the flush request from the tag.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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