linux-kernel - [PATCH 5.8 098/232] dm ebs: Fix incorrect checking for REQ_OP

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Date:   Thu, 20 Aug 2020 11:19:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, John Dorminy <jdorminy@...hat.com>,
        Heinz Mauelshagen <heinzm@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 5.8 098/232] dm ebs: Fix incorrect checking for REQ_OP_FLUSH

From: John Dorminy <jdorminy@...hat.com>

commit 4cb6f22612511ff2aba4c33fb0f281cae7c23772 upstream.

REQ_OP_FLUSH was being treated as a flag, but the operation
part of bio->bi_opf must be treated as a whole. Change to
accessing the operation part via bio_op(bio) and checking
for equality.

Signed-off-by: John Dorminy <jdorminy@...hat.com>
Acked-by: Heinz Mauelshagen <heinzm@...hat.com>
Fixes: d3c7b35c20d60 ("dm: add emulated block size target")
Cc: stable@...r.kernel.org
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-ebs-target.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/dm-ebs-target.c
+++ b/drivers/md/dm-ebs-target.c
@@ -363,7 +363,7 @@ static int ebs_map(struct dm_target *ti,
 	bio_set_dev(bio, ec->dev->bdev);
 	bio->bi_iter.bi_sector = ec->start + dm_target_offset(ti, bio->bi_iter.bi_sector);
 
-	if (unlikely(bio->bi_opf & REQ_OP_FLUSH))
+	if (unlikely(bio_op(bio) == REQ_OP_FLUSH))
 		return DM_MAPIO_REMAPPED;
 	/*
 	 * Only queue for bufio processing in case of partial or overlapping buffers