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// SPDX-License-Identifier: LGPL-2.1
/*
*
* Copyright (C) International Business Machines Corp., 2007
* Author(s): Steve French (sfrench@us.ibm.com)
*
* Common Internet FileSystem (CIFS) client
*
* Operations related to support for exporting files via NFSD
*
*/
/*
* See Documentation/filesystems/nfs/exporting.rst
* and examples in fs/exportfs
*
* Since cifs is a network file system, an "fsid" must be included for
* any nfs exports file entries which refer to cifs paths. In addition
* the cifs mount must be mounted with the "serverino" option (ie use stable
* server inode numbers instead of locally generated temporary ones).
* Although cifs inodes do not use generation numbers (have generation number
* of zero) - the inode number alone should be good enough for simple cases
* in which users want to export cifs shares with NFS. The decode and encode
* could be improved by using a new routine which expects 64 bit inode numbers
* instead of the default 32 bit routines in fs/exportfs
*
*/
#include <linux/fs.h>
#include <linux/exportfs.h>
#include "cifsglob.h"
#include "cifs_debug.h"
#include "cifsfs.h"
#ifdef CONFIG_CIFS_NFSD_EXPORT
static struct dentry *cifs_get_parent(struct dentry *dentry)
{
/* BB need to add code here eventually to enable export via NFSD */
cifs_dbg(FYI, "get parent for %p\n", dentry);
return ERR_PTR(-EACCES);
}
const struct export_operations cifs_export_ops = {
.encode_fh = generic_encode_ino32_fh,
.get_parent = cifs_get_parent,
/*
* Following export operations are mandatory for NFS export support:
* .fh_to_dentry =
*/
};
#endif /* CONFIG_CIFS_NFSD_EXPORT */
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