crush: support chooseleaf_vary_r tunable (tunables3) by default

Add TUNABLES3 feature (chooseleaf_vary_r tunable) to a set of features
supported by default.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

include/linux/ceph/ceph_features.h

@@ -43,6 +43,13 @@
 #define CEPH_FEATURE_CRUSH_V2      (1ULL<<36)  /* new indep; SET_* steps */
 #define CEPH_FEATURE_EXPORT_PEER   (1ULL<<37)
 #define CEPH_FEATURE_OSD_ERASURE_CODES (1ULL<<38)
+#define CEPH_FEATURE_OSD_TMAP2OMAP (1ULL<<38)   /* overlap with EC */
+/* The process supports new-style OSDMap encoding. Monitors also use
+   this bit to determine if peers support NAK messages. */
+#define CEPH_FEATURE_OSDMAP_ENC    (1ULL<<39)
+#define CEPH_FEATURE_MDS_INLINE_DATA     (1ULL<<40)
+#define CEPH_FEATURE_CRUSH_TUNABLES3     (1ULL<<41)
+#define CEPH_FEATURE_OSD_PRIMARY_AFFINITY (1ULL<<41)  /* overlap w/ tunables3 */
 
 /*
  * The introduction of CEPH_FEATURE_OSD_SNAPMAPPER caused the feature
@@ -82,7 +89,8 @@ static inline u64 ceph_sanitize_features(u64 features)
 	 CEPH_FEATURE_OSDHASHPSPOOL |		\
 	 CEPH_FEATURE_OSD_CACHEPOOL |		\
 	 CEPH_FEATURE_CRUSH_V2 |		\
-	 CEPH_FEATURE_EXPORT_PEER)
+	 CEPH_FEATURE_EXPORT_PEER |		\
+	 CEPH_FEATURE_CRUSH_TUNABLES3)
 
 #define CEPH_FEATURES_REQUIRED_DEFAULT   \
 	(CEPH_FEATURE_NOSRCADDR |	 \