linux-kernel - [PATCH 4.15 121/163] rbd: whitelist RBD_FEATURE

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Date:   Wed, 21 Feb 2018 13:49:10 +0100
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 4.15 121/163] rbd: whitelist RBD_FEATURE_OPERATIONS feature bit

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit e573427a440fd67d3f522357d7ac901d59281948 upstream.

This feature bit restricts older clients from performing certain
maintenance operations against an image (e.g. clone, snap create).
krbd does not perform maintenance operations.

Cc: stable@...r.kernel.org
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 |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -124,11 +124,13 @@ static int atomic_dec_return_safe(atomic
 #define RBD_FEATURE_STRIPINGV2		(1ULL<<1)
 #define RBD_FEATURE_EXCLUSIVE_LOCK	(1ULL<<2)
 #define RBD_FEATURE_DATA_POOL		(1ULL<<7)
+#define RBD_FEATURE_OPERATIONS		(1ULL<<8)
 
 #define RBD_FEATURES_ALL	(RBD_FEATURE_LAYERING |		\
 				 RBD_FEATURE_STRIPINGV2 |	\
 				 RBD_FEATURE_EXCLUSIVE_LOCK |	\
-				 RBD_FEATURE_DATA_POOL)
+				 RBD_FEATURE_DATA_POOL |	\
+				 RBD_FEATURE_OPERATIONS)
 
 /* Features supported by this (client software) implementation. */