linux-kernel - [PATCH 5.6 018/166] rbd: dont test rbd_dev->opts in rbd_dev_image

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Date:   Wed, 22 Apr 2020 11:55:45 +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, Ilya Dryomov <idryomov@...il.com>,
        Jason Dillaman <dillaman@...hat.com>
Subject: [PATCH 5.6 018/166] rbd: dont test rbd_dev->opts in rbd_dev_image_release()

From: Ilya Dryomov <idryomov@...il.com>

commit b8776051529230f76e464d5ffc5d1cf8465576bf upstream.

rbd_dev->opts is used to distinguish between the image that is being
mapped and a parent.  However, because we no longer establish watch for
read-only mappings, this test is imprecise and results in unnecessary
rbd_unregister_watch() calls.

Make it consistent with need_watch in rbd_dev_image_probe().

Fixes: b9ef2b8858a0 ("rbd: don't establish watch for read-only mappings")
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Reviewed-by: Jason Dillaman <dillaman@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/block/rbd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -6955,7 +6955,7 @@ static void rbd_print_dne(struct rbd_dev
 
 static void rbd_dev_image_release(struct rbd_device *rbd_dev)
 {
-	if (rbd_dev->opts)
+	if (!rbd_is_ro(rbd_dev))
 		rbd_unregister_watch(rbd_dev);
 
 	rbd_dev_unprobe(rbd_dev);