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>
---
 fs/bio-integrity.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index b355b98dbf1b4..1c2ce0c877113 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -182,6 +182,9 @@ static int bdev_integrity_enabled(struct block_device *bdev, int rw)
  */
 int bio_integrity_enabled(struct bio *bio)
 {
+	if (!bio_is_rw(bio))
+		return 0;
+
 	/* Already protected? */
 	if (bio_integrity(bio))
 		return 0;
-- 
2.39.5