[PATCH 4.15 121/163] rbd: whitelist RBD_FEATURE_OPERATIONS feature bit

Greg Kroah-Hartman
2018-02-21T12:49:10Z

From: Ilya Dryomov <idryomov@gmail.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@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>

---
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. */