5857 lofiadm should ask passphrase once if the crypto is already set up
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Toomas Soome <tsoome@me.com>

*** 20,29 ****
--- 20,30 ----
   */
  /*
   * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   *
   * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
+  * Copyright (c) 2016 Andrey Sokolov
   */
  
  /*
   * lofi (loopback file) driver - allows you to attach a file to a device,
   * which can then be accessed through that device. The simple model is that
*** 130,148 ****
  #include <sys/crypto/common.h>
  #include <sys/crypto/api.h>
  #include <sys/rctl.h>
  #include <LzmaDec.h>
  
- /*
-  * The basis for CRYOFF is derived from usr/src/uts/common/sys/fs/ufs_fs.h.
-  * Crypto metadata, if it exists, is located at the end of the boot block
-  * (BBOFF + BBSIZE, which is SBOFF).  The super block and everything after
-  * is offset by the size of the crypto metadata which is handled by
-  * lsp->ls_crypto_offset.
-  */
- #define CRYOFF  ((off_t)8192)
- 
  #define NBLOCKS_PROP_NAME       "Nblocks"
  #define SIZE_PROP_NAME          "Size"
  #define ZONE_PROP_NAME          "zone"
  
  #define SETUP_C_DATA(cd, buf, len)              \
--- 131,140 ----