crush: add SET_CHOOSE_TRIES rule step

Since we can specify the recursive retries in a rule, we may as well also
specify the non-recursive tries too for completeness.

Reflects ceph.git commit d1b97462cffccc871914859eaee562f2786abfd1.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
diff --git a/include/linux/crush/crush.h b/include/linux/crush/crush.h
index 07b8fd4..5f95969 100644
--- a/include/linux/crush/crush.h
+++ b/include/linux/crush/crush.h
@@ -47,7 +47,8 @@
 	CRUSH_RULE_CHOOSE_LEAF_FIRSTN = 6,
 	CRUSH_RULE_CHOOSE_LEAF_INDEP = 7,
 
-	CRUSH_RULE_SET_CHOOSE_LEAF_TRIES = 9,
+	CRUSH_RULE_SET_CHOOSE_TRIES = 8, /* override choose_total_tries */
+	CRUSH_RULE_SET_CHOOSE_LEAF_TRIES = 9, /* override chooseleaf_descend_once */
 };
 
 /*