From: Jens Axboe <jaxboe@fusionio.com>
Date: Fri, 25 Mar 2011 15:57:52 +0000 (+0100)
Subject: block: fix bug with inserting flush requests as sort/merge
X-Git-Tag: v2.6.39-rc1~74^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=401a18e92ce32cd0ddfa5738899ca2b8114f2bbf;p=pandora-kernel.git

block: fix bug with inserting flush requests as sort/merge

With the introduction of the on-stack plugging, we would assume
that any request being inserted was a normal file system request.
As flush/fua requires a special insert mode, this caused problems.

Fix this up by checking for this in flush_plug_list() and use
the appropriate insert mechanism.

Big thanks goes to Markus Tripplesdorf for tirelessly testing
patches, and to Sergey Senozhatsky for helping find the real
issue.

Reported-by: Markus Tripplesdorf <markus@trippelsdorf.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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