patch-2.3.46 linux/fs/tunnel.c

• Lines: 51
• Date: Wed Feb 16 15:42:06 2000
• Orig file: v2.3.45/linux/fs/tunnel.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.45/linux/fs/tunnel.c linux/fs/tunnel.c
@@ -0,0 +1,50 @@
+/*  fs/tunnel.c: utility functions to support VFS tunnelling
+
+    Copyright (C) 1999  Richard Gooch
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    Richard Gooch may be reached by email at  rgooch@atnf.csiro.au
+    The postal address is:
+      Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
+
+    ChangeLog
+
+    19991121   Richard Gooch <rgooch@atnf.csiro.au>
+               Created.
+*/
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+
+
+/*PUBLIC_FUNCTION*/
+struct dentry *vfs_tunnel_lookup (const struct dentry *dentry,
+				  const struct dentry *parent,
+				  const struct dentry *covered)
+/*  [SUMMARY] Lookup the corresponding dentry in the mounted-over FS.
+    <dentry> The dentry which is in the overmounting FS.
+    <parent> The parent of the dentry in the mounted-over FS. This may be NULL.
+    <covered> The dentry covered by the root dentry of the overmounting FS.
+    [RETURNS] A dentry on success, else NULL.
+*/
+{
+    struct dentry *root = dentry->d_sb->s_root;
+
+    if (covered == root) return NULL;
+    if (parent) return lookup_dentry (dentry->d_name.name, parent, 0);
+}   /*  End Function vfs_tunnel_lookup  */