LOCAL: listen for ldi notifications of disk offline/degrade

@@ -19,11 +19,12 @@
  * CDDL HEADER END
  */
 /*
  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
- * Copyright 2011 Joyent, Inc. All rights reserved.
+ * Copyright (c) 2012 Joyent, Inc. All rights reserved.
+ * Copyright 2012 Nexenta Systems, Inc.  All rights reserved.
  */
 
 #ifndef _SYS_VDEV_DISK_H
 #define _SYS_VDEV_DISK_H
 

@@ -42,10 +43,12 @@
 #ifdef _KERNEL
 typedef struct vdev_disk {
         ddi_devid_t     vd_devid;
         char            *vd_minor;
         ldi_handle_t    vd_lh;
+        list_t          vd_ldi_cbs;
+        boolean_t       vd_ldi_offline;
 } vdev_disk_t;
 #endif
 
 extern int vdev_disk_physio(vdev_t *, caddr_t, size_t, uint64_t, int);