XXXX don't fail device detach when it's physically removed

*** 16,30 ****
--- 16,35 ----
   * fields enclosed by brackets "[]" replaced with your own identifying
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
+ 
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
+ /*
+  * Copyright 2018 Nexenta Systems, Inc.
+  */
+ 
  #ifndef _SYS_DV_NODE_H
  #define _SYS_DV_NODE_H
  
  /*
   * dv_nodes are the file-system specific part of the
*** 108,117 ****
--- 113,123 ----
  
  /* flags for devfs_clean() */
  #define DV_CLEAN_FORCE  0x01    /* force clean of refed directories */
  #define DV_RESET_PERM   0x02    /* force resetting of node permission */
  #define DV_CLEANDIR_LCK 0x04    /* dv_contents already held */
+ #define DV_DEVI_GONE    0x08    /* force clean of refed files */
  
  struct devfs_data {
          struct  dv_node *devfs_root;
          struct  vfs     *devfs_vfsp;
  };