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Linux/fs/cifs/export.c

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  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
 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 

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