1 files changed, 67 insertions, 0 deletions
diff --git a/libnetfs/file-reparent.c b/libnetfs/file-reparent.c
new file mode 100644
index 00000000..6397951e
--- /dev/null
+++ b/libnetfs/file-reparent.c
@@ -0,0 +1,67 @@
+/* Reparent a file
+
+   Copyright (C) 1997 Free Software Foundation
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   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 the GNU Hurd; see the file COPYING.  If not, write to
+   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "fs_S.h"
+
+error_t
+netfs_S_file_reparent (struct protid *cred, mach_port_t parent,
+		       mach_port_t *new_file, mach_msg_type_name_t *new_file_type)
+{
+  struct node *node;
+  struct protid *new_cred;
+
+  if (! cred)
+    return EOPNOTSUPP;
+  
+  node = cred->po->np;
+
+  mutex_lock (&node->lock);
+  new_cred =
+    netfs_make_protid (netfs_make_peropen (node, cred->po->openstat, cred->po),
+		       iohelp_dup_iouser (cred->user));
+  mutex_unlock (&node->lock);
+
+  if (new_cred)
+    {
+      /* Remove old shadow root state.  */
+      if (new_cred->po->shadow_root && new_cred->po->shadow_root != node)
+	{
+	  mutex_lock (&new_cred->po->shadow_root->lock);
+	  netfs_nput (new_cred->po->shadow_root);
+	}
+      if (new_cred->po->shadow_root_parent)
+	mach_port_deallocate (mach_task_self (), new_cred->po->shadow_root_parent);
+
+      /* And install PARENT instead.  */
+      new_cred->po->shadow_root = node;
+      new_cred->po->shadow_root_parent = parent;
+
+      *new_file = ports_get_right (new_cred);
+      *new_file_type = MACH_MSG_TYPE_MAKE_SEND;
+
+      ports_port_deref (new_cred);
+
+      return 0;
+    }
+  else
+    return errno;
+}