From c6d600c65ebfa10a2a10d3e9183a24527ebe2aa4 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Wed, 30 Apr 2014 13:43:56 -0600
Subject: [PATCH] blk-mq: refactor request insertion/merging

Refactor the logic around adding a new bio to a software queue,
so we nest the ctx->lock where we really need it (merge and
insertion) and don't hold it when we don't (init and IO start
accounting).

Signed-off-by: Jens Axboe <axboe@fb.com>
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