lib/nfs/Base: kludge to reduce number of NFS mounts

Creating a NfsStorage sets its own export_name as the "base".  Now
NfsFileReader can use this information to derive the export_name to be
mounted, instead of guessing.  This solves the "too many connection"
problem on the NFS server while updating the database.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/lib/nfs/Base.hxx b/src/lib/nfs/Base.hxx
new file mode 100644
index 000000000..3a92a86d3
--- /dev/null
+++ b/src/lib/nfs/Base.hxx
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_NFS_BASE_HXX
+#define MPD_NFS_BASE_HXX
+
+#include "check.h"
+#include "Compiler.h"
+
+/**
+ * Set the "base" NFS server and export name.  This will be the
+ * default export that will be mounted if a file within this export is
+ * being opened, instead of guessing the mount point.
+ *
+ * This is a kludge that is not truly thread-safe.
+ */
+void
+nfs_set_base(const char *server, const char *export_name);
+
+/**
+ * Check if the given server and path are inside the "base"
+ * server/export_name.  If yes, then a pointer to the portion of
+ * "path" after the export_name is returned; otherwise, nullptr is
+ * returned.
+ */
+gcc_pure
+const char *
+nfs_check_base(const char *server, const char *path);
+
+#endif