From: Jens Axboe <axboe@fb.com>
Date: Fri, 29 May 2015 19:10:23 +0000 (-0600)
Subject: block: only honor SG gap prevention for merges that contain data
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~149^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=beefa6ba7bf304d3de3a02cb7366fb0a7d6b27ab;p=pandora-kernel.git

block: only honor SG gap prevention for merges that contain data

We can safely merge anything that wont generate an SG list entry,
so if the bio is data-less (discard), don't look at potential
SG gaps.

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