rbd: advertise support for RBD_FEATURE_DEEP_FLATTEN

All copyups perform deep-copyup regardless of whether deep-flatten
feature is enabled.  The feature bit is used to ensure that image is
written to only by new-enough clients that always perform deep-copyup.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index ccfbed8741b8..8dbfc5e54ae3 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -115,12 +115,14 @@ static int atomic_dec_return_safe(atomic_t *v)
 #define RBD_FEATURE_LAYERING            (1ULL<<0)
 #define RBD_FEATURE_STRIPINGV2          (1ULL<<1)
 #define RBD_FEATURE_EXCLUSIVE_LOCK      (1ULL<<2)
+#define RBD_FEATURE_DEEP_FLATTEN        (1ULL<<5)
 #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_DEEP_FLATTEN |     \
                                  RBD_FEATURE_DATA_POOL |        \
                                  RBD_FEATURE_OPERATIONS)