From e69f18f06b97ed29645d020500222bfcec2b42b2 Mon Sep 17 00:00:00 2001
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Date: Tue, 8 Apr 2014 22:59:31 -0400
Subject: [PATCH] block: Ensure we only enable integrity metadata for reads and
 writes

We'd occasionally attempt to generate protection information for flushes
and other requests with a zero payload. Make sure we only attempt to
enable integrity for reads and writes.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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