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/* 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 */
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