5819 want dumpadm(1m) option to print estimated dump size

@@ -18,10 +18,11 @@
  *
  * CDDL HEADER END
  */
 /*
  * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
  */
 
 #ifndef _DCONF_H
 #define _DCONF_H
 

@@ -69,10 +70,11 @@
 extern int dconf_close(dumpconf_t *);
 extern int dconf_write(dumpconf_t *);
 extern int dconf_update(dumpconf_t *, int);
 extern void dconf_print(dumpconf_t *, FILE *);
 extern int dconf_write_uuid(dumpconf_t *);
+extern int dconf_get_dumpsize(dumpconf_t *);
 
 extern int dconf_str2device(dumpconf_t *, char *);
 extern int dconf_str2savdir(dumpconf_t *, char *);
 extern int dconf_str2content(dumpconf_t *, char *);
 extern int dconf_str2enable(dumpconf_t *, char *);