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.rst
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
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