NEX-1142 move rwlock to vdev to protect vdev_tsd
not just ldi handle.
This way we serialize open/close, yet allow parallel I/O.
NEX-1065 Added serialization to avoid race
between ldi notification and I/O path.
Also fixes OS-124, NEX-1051, NEX-1062.

@@ -20,11 +20,11 @@
  */
 /*
  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  * Copyright (c) 2013 Joyent, Inc. All rights reserved.
- * Copyright 2012 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
  */
 
 #ifndef _SYS_VDEV_DISK_H
 #define _SYS_VDEV_DISK_H
 

@@ -44,11 +44,10 @@
 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, boolean_t);