4374 dn_free_ranges should use range_tree_t
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Max Grossman <max.grossman@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Dan McDonald <danmcd@omniti.com>

*** 18,28 ****
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2013 by Delphix. All rights reserved.
   */
  
  /*
   * The 512-byte leaf is broken into 32 16-byte chunks.
   * chunk number n means l_chunk[n], even though the header precedes it.
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2013, 2014 by Delphix. All rights reserved.
   */
  
  /*
   * The 512-byte leaf is broken into 32 16-byte chunks.
   * chunk number n means l_chunk[n], even though the header precedes it.
*** 103,113 ****
  void
  zap_leaf_byteswap(zap_leaf_phys_t *buf, int size)
  {
          int i;
          zap_leaf_t l;
!         l.l_bs = highbit(size)-1;
          l.l_phys = buf;
  
          buf->l_hdr.lh_block_type =      BSWAP_64(buf->l_hdr.lh_block_type);
          buf->l_hdr.lh_prefix =          BSWAP_64(buf->l_hdr.lh_prefix);
          buf->l_hdr.lh_magic =           BSWAP_32(buf->l_hdr.lh_magic);
--- 103,113 ----
  void
  zap_leaf_byteswap(zap_leaf_phys_t *buf, int size)
  {
          int i;
          zap_leaf_t l;
!         l.l_bs = highbit64(size) - 1;
          l.l_phys = buf;
  
          buf->l_hdr.lh_block_type =      BSWAP_64(buf->l_hdr.lh_block_type);
          buf->l_hdr.lh_prefix =          BSWAP_64(buf->l_hdr.lh_prefix);
          buf->l_hdr.lh_magic =           BSWAP_32(buf->l_hdr.lh_magic);
*** 155,165 ****
  void
  zap_leaf_init(zap_leaf_t *l, boolean_t sort)
  {
          int i;
  
!         l->l_bs = highbit(l->l_dbuf->db_size)-1;
          zap_memset(&l->l_phys->l_hdr, 0, sizeof (struct zap_leaf_header));
          zap_memset(l->l_phys->l_hash, CHAIN_END, 2*ZAP_LEAF_HASH_NUMENTRIES(l));
          for (i = 0; i < ZAP_LEAF_NUMCHUNKS(l); i++) {
                  ZAP_LEAF_CHUNK(l, i).l_free.lf_type = ZAP_CHUNK_FREE;
                  ZAP_LEAF_CHUNK(l, i).l_free.lf_next = i+1;
--- 155,165 ----
  void
  zap_leaf_init(zap_leaf_t *l, boolean_t sort)
  {
          int i;
  
!         l->l_bs = highbit64(l->l_dbuf->db_size) - 1;
          zap_memset(&l->l_phys->l_hdr, 0, sizeof (struct zap_leaf_header));
          zap_memset(l->l_phys->l_hash, CHAIN_END, 2*ZAP_LEAF_HASH_NUMENTRIES(l));
          for (i = 0; i < ZAP_LEAF_NUMCHUNKS(l); i++) {
                  ZAP_LEAF_CHUNK(l, i).l_free.lf_type = ZAP_CHUNK_FREE;
                  ZAP_LEAF_CHUNK(l, i).l_free.lf_next = i+1;