rbd: whitelist RBD_FEATURE_OPERATIONS feature bit

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>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 4a886d8c4a3c46305216a26262229fd0173cef0d..8e40da0937667a2e621814f02910adc158809487 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. */