ceph: warn on missing snap realm

Well, this Shouldn't Happen, so it would be helpful to know the caller when
it does.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index e3b848d7698d..30acc7b046ee 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -586,6 +586,7 @@ retry:
                 } else {
                         pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
                                realmino);
+                        WARN_ON(!realm);
                 }
         }