export.c 2.4 KB

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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. * See Documentation/filesystems/nfs/exporting.rst
  27. * and examples in fs/exportfs
  28. *
  29. * Since cifs is a network file system, an "fsid" must be included for
  30. * any nfs exports file entries which refer to cifs paths. In addition
  31. * the cifs mount must be mounted with the "serverino" option (ie use stable
  32. * server inode numbers instead of locally generated temporary ones).
  33. * Although cifs inodes do not use generation numbers (have generation number
  34. * of zero) - the inode number alone should be good enough for simple cases
  35. * in which users want to export cifs shares with NFS. The decode and encode
  36. * could be improved by using a new routine which expects 64 bit inode numbers
  37. * instead of the default 32 bit routines in fs/exportfs
  38. *
  39. */
  40. #include <linux/fs.h>
  41. #include <linux/exportfs.h>
  42. #include "cifsglob.h"
  43. #include "cifs_debug.h"
  44. #include "cifsfs.h"
  45. #ifdef CONFIG_CIFS_NFSD_EXPORT
  46. static struct dentry *cifs_get_parent(struct dentry *dentry)
  47. {
  48. /* BB need to add code here eventually to enable export via NFSD */
  49. cifs_dbg(FYI, "get parent for %p\n", dentry);
  50. return ERR_PTR(-EACCES);
  51. }
  52. const struct export_operations cifs_export_ops = {
  53. .get_parent = cifs_get_parent,
  54. /* Following five export operations are unneeded so far and can default:
  55. .get_dentry =
  56. .get_name =
  57. .find_exported_dentry =
  58. .decode_fh =
  59. .encode_fs = */
  60. };
  61. #endif /* CONFIG_CIFS_NFSD_EXPORT */