From 854fbb9c699e34fe4889e6907c4fc73889192223 Mon Sep 17 00:00:00 2001
From: Keith Busch <keith.busch@intel.com>
Date: Wed, 11 Feb 2015 08:20:13 -0700
Subject: [PATCH] block: prevent request-to-request merging with gaps if not
 allowed

If the queue has SG_GAPS set, we must not merge across an sg gap.
This is caught for the bio case, but currently not for the
more rare case of merging two requests directly.

Signed-off-by: Keith Busch <keith.busch@intel.com>

Cut the dm bits, those will go through the dm tree, and fixed
the test_bit() test.

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