From 8f06b239f2a41310582f9d1932778afbc0c9c9f6 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sat, 4 Apr 2015 19:20:56 +0200
Subject: [PATCH] path-util: if parent can do name_to_handle() but relevant dir
 not, it's a mount point

---
 src/shared/path-util.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index 6a984fc1d82..e485c8e71e4 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -515,7 +515,12 @@ int fd_is_mount_point(int fd) {
                                 return 1;
                 } else
                         return -errno;
-        } else
+        } else if (nosupp)
+                /* The parent can do name_to_handle_at() but the
+                 * directory we are interested in can't? If so, it
+                 * must be a mount point. */
+                return 1;
+        else
                 return mount_id != mount_id_parent;
 
 fallback: