1 files changed, 58 insertions, 0 deletions
diff --git a/c/src/libfs/src/imfs/imfs_unmount.c b/c/src/libfs/src/imfs/imfs_unmount.c
new file mode 100644
index 0000000000..f29d720ab3
--- /dev/null
+++ b/c/src/libfs/src/imfs/imfs_unmount.c
@@ -0,0 +1,58 @@
+/*
+ *  IMFS_unmount
+ *
+ *  This routine will look at a mount table entry that we are going to
+ *  add to the mount table. If the mount point
+ *  rtems_filesystem_location_info_t struct refers to a node that is a
+ *  directory that has a file system mounted on it, the node will be
+ *  marked as a mount point by * setting its directory.mt_fs pointer
+ *  to NULL. This indicates that a directory is no longer mounted on
+ *  this node.
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <errno.h>
+
+#include "imfs.h"
+#include "libio_.h"
+
+int IMFS_unmount(
+  rtems_filesystem_mount_table_entry_t *mt_entry
+)
+{
+  IMFS_jnode_t  *node;
+
+  node = mt_entry->mt_point_node.node_access;
+
+  /* 
+   * Is the node that we are mounting onto a directory node ? 
+   */
+
+  if ( node->type != IMFS_DIRECTORY )
+    set_errno_and_return_minus_one( ENOTDIR );
+
+  /* 
+   * Did the node indicate that there was a directory mounted here? 
+   */
+
+  if ( node->info.directory.mt_fs == NULL )
+    set_errno_and_return_minus_one( EINVAL );  /* XXX */
+
+  /* 
+   * Set the mt_fs pointer to indicate that there is no longer 
+   * a file system mounted to this point.
+   */
+  
+  node->info.directory.mt_fs = NULL;
+
+  return 0; 
+}