osd: make note about when we get MBackfillReserve REJECT messages

Signed-off-by: Sage Weil <sage@redhat.com>
(cherry picked from commit 6e829a3a7c7aaff78142514fde7703cad48953fd)

diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index ae5d30f9393b75de9e6ec89d0075fb0a6d736f20..02b91358fe34b64ab563d6918605c49132e0a74d 100644 (file)
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -8923,6 +8923,8 @@ void OSD::handle_pg_backfill_reserve(OpRequestRef op)
        m->query_epoch,
        PG::RemoteBackfillReserved()));
   } else if (m->type == MBackfillReserve::REJECT) {
+    // NOTE: this is replica -> primary "i reject your request"
+    //      and also primary -> replica "cancel my previously-granted request"
     evt = PG::CephPeeringEvtRef(
       new PG::CephPeeringEvt(
        m->query_epoch,