1 files changed, 36 insertions, 0 deletions
diff --git a/ufs/mapbuf.c b/ufs/mapbuf.c
new file mode 100644
index 00000000..edf432a5
--- /dev/null
+++ b/ufs/mapbuf.c
@@ -0,0 +1,36 @@
+/* Cache mappings of the disk
+   Copyright (C) 1994 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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, or (at
+   your option) any later version.
+
+   The GNU Hurd 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+#include "ufs.h"
+
+struct mapbuf *mblist;
+spin_lock_t mblistlock = SPIN_LOCK_INITIALIZER;
+
+struct mapbuf *
+map_region (vm_offset_t diskloc, vm_size_t length)
+{
+  struct mapbuf *mb;
+  
+  /* Check to see if we are already mapping this region */
+  spin_lock (&mblistlock);
+  for (mb = mblist; mb; mb = mb->next)
+    {
+