rbd: whitelist RBD_FEATURE_OPERATIONS feature bit

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@vger.kernel.org
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 6092272..fe4fd8a 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -124,11 +124,13 @@ static int atomic_dec_return_safe(atomic_t *v)
 #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. */