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>

@@ -20,10 +20,11 @@
  */
 /*
  * 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

@@ -130,19 +131,10 @@
 #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)              \