From: Josef Bacik <jbacik@fusionio.com>
Date: Wed, 14 Aug 2013 18:02:47 +0000 (-0400)
Subject: Btrfs: avoid starting a transaction in the write path
X-Git-Tag: v3.12-rc1~40^2~60
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=00361589d2eebd90fca022148c763e40d3e90871;p=pandora-kernel.git

Btrfs: avoid starting a transaction in the write path

I noticed while looking at a deadlock that we are always starting a transaction
in cow_file_range().  This isn't really needed since we only need a transaction
if we are doing an inline extent, or if the allocator needs to allocate a chunk.
So push down all the transaction start stuff to be closer to where we actually
need a transaction in all of these cases.  This will hopefully reduce our write
latency when we are committing often.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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