osd/ReplicatedPG: allow reads to proxy etc even if blocked

If we are not write ordered, continue with cache checks so that we can
(among other things) proxy reads while promoting.

Note that this may reorder reads for clients, but we've decided that's okay.

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/osd/ReplicatedPG.cc b/src/osd/ReplicatedPG.cc
index de677e38a47a30bafaf5180685efb663fd9a43e6..46ec6eccb08cd42db8fdd9e45e681e67cd175c20 100644 (file)
--- a/src/osd/ReplicatedPG.cc
+++ b/src/osd/ReplicatedPG.cc
@@ -1751,7 +1751,8 @@ bool ReplicatedPG::maybe_handle_cache(OpRequestRef op,
             << " missing_oid " << missing_oid
             << dendl;
 
-  if (obc.get() && obc->is_blocked()) {
+  // if it is write-ordered and blocked, stop now
+  if (obc.get() && obc->is_blocked() && write_ordered) {
     // we're already doing something with this object
     dout(20) << __func__ << " blocked on " << obc->obs.oi.soid << dendl;
     return false;