From 59d276fe02d7e887a4825ef05c80b8f8c54ba60a Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kmo@daterainc.com>
Date: Sat, 23 Nov 2013 18:19:27 -0800
Subject: [PATCH] block: Add bio_clone_fast()

bio_clone() just got more expensive - however, most users of bio_clone()
don't actually need to modify the biovec. If they aren't modifying the
biovec, and they can guarantee that the original bio isn't freed before
the clone (also true in most cases), we can just point the clone at the
original bio's biovec.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
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