1 /*
2  *   fs/cifs/export.c
3  *
4  *   Copyright (C) International Business Machines  Corp., 2007
5  *   Author(s): Steve French (sfrench@us.ibm.com)
6  *
7  *   Common Internet FileSystem (CIFS) client
8  *
9  *   Operations related to support for exporting files via NFSD
10  *
11  *   This library is free software; you can redistribute it and/or modify
12  *   it under the terms of the GNU Lesser General Public License as published
13  *   by the Free Software Foundation; either version 2.1 of the License, or
14  *   (at your option) any later version.
15  *
16  *   This library is distributed in the hope that it will be useful,
17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
19  *   the GNU Lesser General Public License for more details.
20  *
21  *   You should have received a copy of the GNU Lesser General Public License
22  *   along with this library; if not, write to the Free Software
23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24  */
25 
26  /*
27   * See Documentation/filesystems/nfs/Exporting
28   * and examples in fs/exportfs
29   *
30   * Since cifs is a network file system, an "fsid" must be included for
31   * any nfs exports file entries which refer to cifs paths.  In addition
32   * the cifs mount must be mounted with the "serverino" option (ie use stable
33   * server inode numbers instead of locally generated temporary ones).
34   * Although cifs inodes do not use generation numbers (have generation number
35   * of zero) - the inode number alone should be good enough for simple cases
36   * in which users want to export cifs shares with NFS. The decode and encode
37   * could be improved by using a new routine which expects 64 bit inode numbers
38   * instead of the default 32 bit routines in fs/exportfs
39   *
40   */
41 
42 #include <linux/fs.h>
43 #include <linux/exportfs.h>
44 #include "cifsglob.h"
45 #include "cifs_debug.h"
46 #include "cifsfs.h"
47 
48 #ifdef CONFIG_CIFS_NFSD_EXPORT
cifs_get_parent(struct dentry * dentry)49 static struct dentry *cifs_get_parent(struct dentry *dentry)
50 {
51 	/* BB need to add code here eventually to enable export via NFSD */
52 	cifs_dbg(FYI, "get parent for %p\n", dentry);
53 	return ERR_PTR(-EACCES);
54 }
55 
56 const struct export_operations cifs_export_ops = {
57 	.get_parent = cifs_get_parent,
58 /*	Following five export operations are unneeded so far and can default:
59 	.get_dentry =
60 	.get_name =
61 	.find_exported_dentry =
62 	.decode_fh =
63 	.encode_fs =  */
64 };
65 
66 #endif /* CONFIG_CIFS_NFSD_EXPORT */
67 
68