osd/OSDMap: add osd_is_valid_op_target()

Helper to check whether an osd is a given op target for a pg.  This
assumes that for EC we always send ops to the primary, while for
replicated we may target any replica.

Signed-off-by: Sage Weil <sage@redhat.com>
(cherry picked from commit 89c02637914ac7332e9dbdbfefc2049b2b6c127d)

diff --git a/src/osd/OSDMap.h b/src/osd/OSDMap.h
index aafadb6b6c0e0eddfaa5d8f2556829342298e3e5..b63705c03bd7a953fe3b8446ee48514834f1c1b4 100644 (file)
--- a/src/osd/OSDMap.h
+++ b/src/osd/OSDMap.h
@@ -771,6 +771,18 @@ public:
     return calc_pg_role(osd, group, nrep);
   }
 
+  bool osd_is_valid_op_target(pg_t pg, int osd) const {
+    int primary;
+    vector<int> group;
+    int nrep = pg_to_acting_osds(pg, &group, &primary);
+    if (osd == primary)
+      return true;
+    if (pg_is_ec(pg))
+      return false;
+
+    return calc_pg_role(osd, group, nrep) >= 0;
+  }
+
 
   /*
    * handy helpers to build simple maps...