Can a NFS mount be shared out via Samba under Red Hat Enterprise Linux?

Solution Verified - Updated -

Issue

  • Using CIFS/SMB/Samba to share a directory that is also an NFS mount point results in file corruption, stale file locks, and various file access issues including high cpu usage.

  • Stale locks can be found via smbstatus and lsof after files within the share have been closed.

  • The following errors may appear in /var/log/samba/smbd.log or /var/log/messages:

    [2010/02/09 17:37:19, 0] smbd/dfree.c:sys_disk_free(148) WARNING: dfree is broken on this system
[2010/02/08 11:56:49, 0] lib/sysquotas.c:sys_get_quota(421) sys_path_to_bdev() failed for path [.]!

  • A tcpdump taken during a file open operation may contain the following Locking AndX Response:

    NT Status: STATUS_FILE_LOCK_CONFLICT (0xc0000054)</code></span>

Environment

  • Red Hat Enterprise Linux (all versions)
  • NFS3/NFS4 mountpoint or Samba3/Samba4/SMB/CIFS mountpoint
  • Sharing the mountpoint out via the alternate network filesystem method (ie: NFS shared as CIFS, CIFS shared as NFS)

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