4185 New hash algorithm support

*** 20,29 ****
--- 20,32 ----
   */
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
+ /*
+  * Copyright 2013 Saso Kiselkov. All rights reserved.
+  */
  
  /*
   * Fletcher Checksums
   * ------------------
   *
*** 129,140 ****
  #include <sys/sysmacros.h>
  #include <sys/byteorder.h>
  #include <sys/zio.h>
  #include <sys/spa.h>
  
  void
! fletcher_2_native(const void *buf, uint64_t size, zio_cksum_t *zcp)
  {
          const uint64_t *ip = buf;
          const uint64_t *ipend = ip + (size / sizeof (uint64_t));
          uint64_t a0, b0, a1, b1;
  
--- 132,145 ----
  #include <sys/sysmacros.h>
  #include <sys/byteorder.h>
  #include <sys/zio.h>
  #include <sys/spa.h>
  
+ /*ARGSUSED*/
  void
! fletcher_2_native(const void *buf, uint64_t size, const zio_cksum_salt_t *salt,
!     const void *ctx_template, zio_cksum_t *zcp)
  {
          const uint64_t *ip = buf;
          const uint64_t *ipend = ip + (size / sizeof (uint64_t));
          uint64_t a0, b0, a1, b1;
  
*** 146,157 ****
          }
  
          ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
  }
  
  void
! fletcher_2_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp)
  {
          const uint64_t *ip = buf;
          const uint64_t *ipend = ip + (size / sizeof (uint64_t));
          uint64_t a0, b0, a1, b1;
  
--- 151,164 ----
          }
  
          ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
  }
  
+ /*ARGSUSED*/
  void
! fletcher_2_byteswap(const void *buf, uint64_t size,
!     const zio_cksum_salt_t *salt, const void *ctx_template, zio_cksum_t *zcp)
  {
          const uint64_t *ip = buf;
          const uint64_t *ipend = ip + (size / sizeof (uint64_t));
          uint64_t a0, b0, a1, b1;
  
*** 163,174 ****
          }
  
          ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
  }
  
  void
! fletcher_4_native(const void *buf, uint64_t size, zio_cksum_t *zcp)
  {
          const uint32_t *ip = buf;
          const uint32_t *ipend = ip + (size / sizeof (uint32_t));
          uint64_t a, b, c, d;
  
--- 170,183 ----
          }
  
          ZIO_SET_CHECKSUM(zcp, a0, a1, b0, b1);
  }
  
+ /*ARGSUSED*/
  void
! fletcher_4_native(const void *buf, uint64_t size, const zio_cksum_salt_t *salt,
!     const void *ctx_template, zio_cksum_t *zcp)
  {
          const uint32_t *ip = buf;
          const uint32_t *ipend = ip + (size / sizeof (uint32_t));
          uint64_t a, b, c, d;
  
*** 180,191 ****
          }
  
          ZIO_SET_CHECKSUM(zcp, a, b, c, d);
  }
  
  void
! fletcher_4_byteswap(const void *buf, uint64_t size, zio_cksum_t *zcp)
  {
          const uint32_t *ip = buf;
          const uint32_t *ipend = ip + (size / sizeof (uint32_t));
          uint64_t a, b, c, d;
  
--- 189,202 ----
          }
  
          ZIO_SET_CHECKSUM(zcp, a, b, c, d);
  }
  
+ /*ARGSUSED*/
  void
! fletcher_4_byteswap(const void *buf, uint64_t size,
!     const zio_cksum_salt_t *salt, const void *ctx_template, zio_cksum_t *zcp)
  {
          const uint32_t *ip = buf;
          const uint32_t *ipend = ip + (size / sizeof (uint32_t));
          uint64_t a, b, c, d;