8277159: Fix java/nio/file/FileStore/Basic.java test by ignoring /run/user/* mount points

Reviewed-by: bpb, shade

Author: akashche

test/jdk/java/nio/file/FileStore/Basic.java

@@ -145,6 +145,16 @@ static void doTests(Path dir) throws IOException {
                     // reflect whether the space attributes would be accessible
                     // were access to be permitted
                     System.err.format("%s is inaccessible\n", store);
+                } catch (FileSystemException fse) {
+                    // On Linux, ignore the FSE if the path is one of the
+                    // /run/user/$UID mounts created by pam_systemd(8) as it
+                    // might be mounted as a fuse.portal filesystem and
+                    // its access attempt might fail with EPERM
+                    if (!Platform.isLinux() || store.toString().indexOf("/run/user") == -1) {
+                        throw new RuntimeException(fse);
+                    } else {
+                        System.err.format("%s error: %s\n", store, fse);
+                    }
                 }
 
                 // two distinct FileStores should not be equal