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>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index ccfbed8741b8dd56bdc29a774019896b21c85a57..8dbfc5e54ae3af971c4028209b9e16156f6e2137 100644 (file)
--- 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)