4185 New hash algorithm support

@@ -20,10 +20,11 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012 by Delphix. All rights reserved.
  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright 2013 Saso Kiselkov. All rights reserved.
  */
 
 #ifndef _SYS_SPA_H
 #define _SYS_SPA_H
 

@@ -51,10 +52,11 @@
 typedef struct spa_aux_vdev spa_aux_vdev_t;
 typedef struct ddt ddt_t;
 typedef struct ddt_entry ddt_entry_t;
 struct dsl_pool;
 struct dsl_dataset;
+struct zfeature_info;
 
 /*
  * General-purpose 32-bit and 64-bit bitfield encodings.
  */
 #define BF32_DECODE(x, low, len)        P2PHASE((x) >> (low), 1U << (len))

@@ -122,10 +124,18 @@
 typedef struct zio_cksum {
         uint64_t        zc_word[4];
 } zio_cksum_t;
 
 /*
+ * Some checksums/hashes need a 256-bit initialization salt. This salt is kept
+ * secret and is suitable for use in MAC algorithms as the key.
+ */
+typedef struct zio_cksum_salt {
+        uint8_t         zcs_bytes[32];
+} zio_cksum_salt_t;
+
+/*
  * Each block is described by its DVAs, time of birth, checksum, etc.
  * The word-by-word, bit-by-bit layout of the blkptr is as follows:
  *
  *      64      56      48      40      32      24      16      8       0
  *      +-------+-------+-------+-------+-------+-------+-------+-------+

@@ -621,10 +631,13 @@
 extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp);
 extern boolean_t spa_has_slogs(spa_t *spa);
 extern boolean_t spa_is_root(spa_t *spa);
 extern boolean_t spa_writeable(spa_t *spa);
 
+/* Salted checksum handling */
+extern int spa_activate_salted_cksum(spa_t *spa, struct zfeature_info *feature);
+
 extern int spa_mode(spa_t *spa);
 extern uint64_t strtonum(const char *str, char **nptr);
 
 extern char *spa_his_ievent_table[];