path: root/src/H5B2.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:		H5B2.c
 *			Jan 31 2005
 *			Quincey Koziol <koziol@ncsa.uiuc.edu>
 *
 * Purpose:		Implements a B-tree, with several modifications from
 *                      the "standard" methods.
 *
 *                      Please see the documentation in:
 *                      doc/html/TechNotes/Btrees.html for a full description
 *                      of how they work, etc.
 *
 *-------------------------------------------------------------------------
 */

#define H5B2_PACKAGE		/*suppress error about including H5B2pkg  */

/* Private headers */
#include "H5private.h"		/* Generic Functions			*/
#include "H5B2pkg.h"		/* B-trees				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5MFprivate.h"	/* File memory management		*/

/* Local macros */

/* Format overhead for each node (on disk) */
#define H5B2_OVERHEAD_SIZE              (H5B2_SIZEOF_MAGIC+1)   /* Signature + version # */

/* Number of records that fit into internal node */
#define H5B2_NUM_INT_REC(f,n,r)         (((n)-(H5B2_OVERHEAD_SIZE+H5B2_NODE_POINTER_SIZE(f)))/((r)+H5B2_NODE_POINTER_SIZE(f)))

/* Number of records that fit into leaf node */
#define H5B2_NUM_LEAF_REC(n,r)          (((n)-H5B2_OVERHEAD_SIZE)/(r))


/* Local typedefs */

/* Local prototypes */

/* Helper functions */
static herr_t H5B2_create_leaf(H5F_t *f, hid_t dxpl_id, H5RC_t *bt2_shared,
    H5B2_node_ptr_t *node_ptr);
static herr_t H5B2_create_internal(H5F_t *f, hid_t dxpl_id, H5RC_t *bt2_shared,
    H5B2_node_ptr_t *node_ptr);
static int H5B2_locate_record(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type,
    unsigned nrec, size_t *rec_off, const uint8_t *native,
    const void *udata);
static herr_t H5B2_split_root(H5F_t *f, hid_t dxpl_id, H5B2_t *bt2,
    H5RC_t *bt2_shared);
static herr_t H5B2_redistribute2(H5F_t *f, hid_t dxpl_id, unsigned depth,
    H5B2_internal_t *internal, unsigned idx);
static herr_t H5B2_split2(H5F_t *f, hid_t dxpl_id, unsigned depth,
    H5B2_node_ptr_t *curr_node_ptr, H5AC_info_t *parent_cache_info,
    H5B2_internal_t *internal, unsigned idx);
static herr_t H5B2_redistribute3(H5F_t *f, hid_t dxpl_id, unsigned depth,
    H5B2_internal_t *internal, unsigned idx);
static herr_t H5B2_iterate_node(H5F_t *f, hid_t dxpl_id, H5RC_t *bt2_shared,
    unsigned depth, const H5B2_node_ptr_t *curr_node, H5B2_operator_t op,
    void *op_data);


/* Package variables */

/* Declare a free list to manage the H5B2_t struct */
H5FL_DEFINE(H5B2_t);

/* Declare a free list to manage the H5B2_internal_t struct */
H5FL_DEFINE(H5B2_internal_t);

/* Declare a free list to manage the H5B2_leaf_t struct */
H5FL_DEFINE(H5B2_leaf_t);


/* Static variables */

/* Declare a free list to manage B-tree node pages to/from disk */
H5FL_BLK_DEFINE_STATIC(node_page);

/* Declare a free list to manage the 'size_t' sequence information */
H5FL_SEQ_DEFINE_STATIC(size_t);

/* Declare a free list to manage the H5B2_shared_t struct */
H5FL_DEFINE_STATIC(H5B2_shared_t);



/*-------------------------------------------------------------------------
 * Function:	H5B2_shared_init
 *
 * Purpose:	Allocate & initialize shared B-tree info
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  2 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5B2_shared_init (H5F_t *f, H5B2_t *bt2, const H5B2_class_t *type,
    size_t node_size, size_t rrec_size,
    unsigned split_percent, unsigned merge_percent)
{
    H5B2_shared_t *shared = NULL;       /* Shared B-tree information */
    unsigned u;                         /* Local index variable */
    herr_t ret_value=SUCCEED;           /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5B2_shared_init)

    /* Allocate space for the shared information */
    if(NULL==(shared = H5FL_CALLOC(H5B2_shared_t)))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree shared information")

    /* Assign user's information */
    shared->split_percent = split_percent;
    shared->merge_percent = merge_percent;
    shared->node_size = node_size;
    shared->rrec_size = rrec_size;

    /* Compute derived information */
    shared->internal_nrec = H5B2_NUM_INT_REC(f,shared->node_size,shared->rrec_size);
    shared->split_int_nrec = (shared->internal_nrec * shared->split_percent)/100;
    shared->merge_int_nrec = (shared->internal_nrec * shared->merge_percent)/100;

    shared->leaf_nrec = H5B2_NUM_LEAF_REC(shared->node_size,shared->rrec_size);
    shared->split_leaf_nrec = (shared->leaf_nrec * shared->split_percent)/100;
    shared->merge_leaf_nrec = (shared->leaf_nrec * shared->merge_percent)/100;

    /* Assign common type information */
    shared->type = type;

    /* Allocate "page" for node I/O */
    if((shared->page=H5FL_BLK_MALLOC(node_page,shared->node_size))==NULL)
        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");
#ifdef H5_USING_PURIFY
HDmemset(shared->page,0,shared->node_size);
#endif /* H5_USING_PURIFY */

    /* Create factory for internal node native record storage */
    if((shared->int_fac=H5FL_fac_init(type->nrec_size*shared->internal_nrec))==NULL)
	HGOTO_ERROR (H5E_RESOURCE, H5E_CANTINIT, NULL, "can't create internal node native key block factory")

    /* Create factory for leaf node native record storage */
    if((shared->leaf_fac=H5FL_fac_init(type->nrec_size*shared->leaf_nrec))==NULL)
	HGOTO_ERROR (H5E_RESOURCE, H5E_CANTINIT, NULL, "can't create leaf node native key block factory")

    /* Create factory for internal node node pointer storage */
    if((shared->node_ptr_fac=H5FL_fac_init(sizeof(H5B2_node_ptr_t)*(shared->internal_nrec+1)))==NULL)
	HGOTO_ERROR (H5E_RESOURCE, H5E_CANTINIT, NULL, "can't create internal node node pointer block factory")

    /* Allocate array of pointers to internal node native keys */
    if((shared->nat_off=H5FL_SEQ_MALLOC(size_t,MAX(shared->internal_nrec,shared->leaf_nrec)))==NULL)
        HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed");

    /* Initialize offsets in native key block */
    for(u=0; u<MAX(shared->internal_nrec,shared->leaf_nrec); u++)
        shared->nat_off[u]=type->nrec_size*u;

    /* Make shared B-tree info reference counted */
    if(NULL==(bt2->shared=H5RC_create(shared,H5B2_shared_free)))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "can't create ref-count wrapper for shared B-tree info")

done:
    if(ret_value<0)
        if(shared)
            H5B2_shared_free(shared);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5B2_shared_init() */


/*-------------------------------------------------------------------------
 * Function:	H5B2_shared_free
 *
 * Purpose:	Free shared B-tree info
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  2 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5B2_shared_free (void *_shared)
{
    H5B2_shared_t *shared = (H5B2_shared_t *)_shared;
    herr_t ret_value=SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT(H5B2_shared_free)

    /* Sanity check */
    HDassert(shared);

    /* Free the B-tree node buffer */
    if(shared->page)
        H5FL_BLK_FREE(node_page,shared->page);

    /* Destroy factory for internal node native record storage */
    if(shared->int_fac)
        if(H5FL_fac_term(shared->int_fac)<0)
            HGOTO_ERROR (H5E_RESOURCE, H5E_CANTRELEASE, FAIL, "can't destroy internal node native key block factory")

    /* Destroy factory for leaf node native record storage */
    if(shared->leaf_fac)
        if(H5FL_fac_term(shared->leaf_fac)<0)
            HGOTO_ERROR (H5E_RESOURCE, H5E_CANTRELEASE, FAIL, "can't destroy leaf node native key block factory")

    /* Destroy factory for internal node node pointer storage */
    if(shared->node_ptr_fac)
        if(H5FL_fac_term(shared->node_ptr_fac)<0)
            HGOTO_ERROR (H5E_RESOURCE, H5E_CANTRELEASE, FAIL, "can't destroy internal node node pointer block factory")

    /* Free the array of offsets into the native key block */
    if(shared->nat_off)
        H5FL_SEQ_FREE(size_t,shared->nat_off);

    /* Free the shared B-tree info itself */
    H5FL_FREE(H5B2_shared_t,shared);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5B2_shared_free() */


/*-------------------------------------------------------------------------
 * Function:	H5B2_create
 *
 * Purpose:	Creates a new empty B-tree in the file.
 *
 * Return:	Success:	Pointer to a new B-tree.
 *
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Jan 31 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5B2_create(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type,
    size_t node_size, size_t rrec_size,
    unsigned split_percent, unsigned merge_percent, haddr_t *addr_p)
{
    H5B2_t *bt2 = NULL;                 /* The new B-tree header information */
    herr_t ret_value=SUCCEED;

    FUNC_ENTER_NOAPI(H5B2_create, FAIL)

    /*
     * Check arguments.
     */
    HDassert(f);
    HDassert(type);
    HDassert(node_size>0);
    HDassert(rrec_size>0);
    HDassert(merge_percent>0 && merge_percent<=100);
    HDassert(split_percent>0 && split_percent<=100);
    HDassert(merge_percent<(split_percent/2));

    /*
     * Allocate file and memory data structures.
     */
    if (NULL==(bt2 = H5FL_MALLOC(H5B2_t)))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree header")

    /* Assign internal information */
    HDmemset(&bt2->cache_info,0,sizeof(H5AC_info_t));
    bt2->cache_info.is_dirty = TRUE;
    bt2->depth = 0;
    bt2->root.addr = HADDR_UNDEF;
    bt2->root.node_nrec = bt2->root.all_nrec = 0;

    /* Initialize shared B-tree info */
    if(H5B2_shared_init(f, bt2, type, node_size, rrec_size, split_percent, merge_percent)<0)
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "can't create shared B-tree info")

    /* Allocate space for the header on disk */
    if (HADDR_UNDEF==(*addr_p=H5MF_alloc(f, H5FD_MEM_BTREE, dxpl_id, (hsize_t)H5B2_HEADER_SIZE(f))))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for B-tree header")

    /* Cache the new B-tree node */
    if (H5AC_set(f, dxpl_id, H5AC_BT2_HDR, *addr_p, bt2, H5AC__NO_FLAGS_SET) < 0)
	HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "can't add B-tree header to cache")

done:
    if (ret_value<0) {
	if (bt2)
            (void)H5B2_cache_hdr_dest(f,bt2);
    } /* end if */
    
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5B2_create() */


/*-------------------------------------------------------------------------
 * Function:	H5B2_locate_record
 *
 * Purpose:	Performs a binary search to locate a record in a sorted
 *              array of records.
 *
 * Return:	Success:	Non-negative array index where new record
 *                              should be inserted
 *
 *		Failure:	Negative, if record already is in array of
 *                              records.
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  3 2005
 *
 *-------------------------------------------------------------------------
 */
static int
H5B2_locate_record(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type,
    unsigned nrec, size_t *rec_off, const uint8_t *native,
    const void *udata)
{
    unsigned	lo = 0, hi;     /* Low & high index values */
    int         idx = 0;        /* Final index value */
    int         cmp = -1;       /* Key comparison value */

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5B2_locate_record)

    hi = nrec;
    while (lo < hi && cmp) {
	idx = (lo + hi) / 2;
	if ((cmp = (type->compare)(f, dxpl_id, udata, native+rec_off[idx])) < 0)
	    hi = idx;
	else
	    lo = idx + 1;
    }
    if(cmp==0)
        idx=(-1);
    else if(cmp>0)
        idx++;

    FUNC_LEAVE_NOAPI(idx);
} /* end H5B2_locate_record */


/*-------------------------------------------------------------------------
 * Function:	H5B2_split_root
 *
 * Purpose:	Split the root node
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  3 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5B2_split_root(H5F_t *f, hid_t dxpl_id, H5B2_t *bt2, H5RC_t *bt2_shared)
{
    const H5AC_class_t *child_class;    /* Pointer to child node's class info */
    H5B2_internal_t *new_root;          /* Pointer to new root node */
    haddr_t left_addr, right_addr;      /* Addresses of left & right child nodes */
    void *left_child, *right_child;     /* Pointers to child nodes */
    unsigned *left_nrec, *right_nrec;   /* Pointers to child # of records */
    uint8_t *left_native, *right_native;/* Pointers to childs' native records */
    H5B2_node_ptr_t *left_node_ptrs=NULL, *right_node_ptrs=NULL;/* Pointers to childs' node pointer info */
    H5B2_shared_t *shared;              /* B-tree's shared info */
    unsigned mid_record;                /* Index of "middle" record in current node */
    unsigned old_root_nrec;             /* Number of records in root node */
    herr_t ret_value=SUCCEED;           /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5B2_split_root)

    HDassert(f);
    HDassert(bt2);
    HDassert(bt2_shared);

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(bt2_shared);
    HDassert(shared);

    if(bt2->depth>0) {
        H5B2_internal_t *old_int=NULL, *new_int=NULL;       /* Pointers to old & new internal nodes */
        H5B2_node_ptr_t new_int_ptr;   /* Node pointer to manage new internal node */

        /* Create new internal node */
        new_int_ptr.all_nrec=new_int_ptr.node_nrec=0;
        if(H5B2_create_internal(f, dxpl_id, bt2_shared, &new_int_ptr)<0)
	    HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "unable to create new internal node")

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_INT;
        left_addr = bt2->root.addr;
        right_addr = new_int_ptr.addr;

        /* Protect both leafs */
        if (NULL == (old_int = H5AC_protect(f, dxpl_id, H5AC_BT2_INT, left_addr, &(bt2->root.node_nrec), bt2_shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")
        if (NULL == (new_int = H5AC_protect(f, dxpl_id, H5AC_BT2_INT, right_addr, &(new_int_ptr.node_nrec), bt2_shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")

        /* More setup for child nodes */
        left_child = old_int;
        right_child = new_int;
        left_nrec = &(old_int->nrec);
        right_nrec = &(new_int->nrec);
        left_native = old_int->int_native;
        right_native = new_int->int_native;
        left_node_ptrs = old_int->node_ptrs;
        right_node_ptrs = new_int->node_ptrs;

        /* Mark child nodes as dirty now */
        old_int->cache_info.is_dirty = TRUE;
        new_int->cache_info.is_dirty = TRUE;
    } /* end if */
    else {
        H5B2_leaf_t *old_leaf=NULL, *new_leaf=NULL;       /* Pointers to old & new leaf nodes */
        H5B2_node_ptr_t new_leaf_ptr;   /* Node pointer to manage new leaf node */

        /* Create new leaf node */
        new_leaf_ptr.all_nrec=new_leaf_ptr.node_nrec=0;
        if(H5B2_create_leaf(f, dxpl_id, bt2_shared, &new_leaf_ptr)<0)
	    HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "unable to create new leaf node")

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_LEAF;
        left_addr = bt2->root.addr;
        right_addr = new_leaf_ptr.addr;

        /* Protect both leafs */
        if (NULL == (old_leaf = H5AC_protect(f, dxpl_id, H5AC_BT2_LEAF, left_addr, &(bt2->root.node_nrec), bt2_shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
        if (NULL == (new_leaf = H5AC_protect(f, dxpl_id, H5AC_BT2_LEAF, right_addr, &(new_leaf_ptr.node_nrec), bt2_shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* More setup for child nodes */
        left_child = old_leaf;
        right_child = new_leaf;
        left_nrec = &(old_leaf->nrec);
        right_nrec = &(new_leaf->nrec);
        left_native = old_leaf->leaf_native;
        right_native = new_leaf->leaf_native;

        /* Mark child nodes as dirty now */
        old_leaf->cache_info.is_dirty = TRUE;
        new_leaf->cache_info.is_dirty = TRUE;
    } /* end if */

    /* Set the old number of records in root node */
    old_root_nrec = bt2->root.node_nrec;

    /* Determine "middle" record to promote to new root */
    mid_record = old_root_nrec/2;

    /* Copy "upper half" of records to new child */
    HDmemcpy(H5B2_NAT_NREC(right_native,shared,0),H5B2_NAT_NREC(left_native,shared,mid_record+1),shared->type->nrec_size*(old_root_nrec-(mid_record+1)));

    /* Copy "upper half" of format root's node pointers, if the children of the root are internal nodes */
    if(bt2->depth>0)
        HDmemcpy(&(right_node_ptrs[0]),&(left_node_ptrs[mid_record+1]),sizeof(H5B2_node_ptr_t)*(old_root_nrec-mid_record));

    /* Create new internal node to use as root */
    if(H5B2_create_internal(f, dxpl_id, bt2_shared, &(bt2->root))<0)
        HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "unable to create new internal node")

    /* Protect new internal node */
    if (NULL == (new_root = H5AC_protect(f, dxpl_id, H5AC_BT2_INT, bt2->root.addr, &(bt2->root.node_nrec), bt2_shared, H5AC_WRITE)))
        HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")

    /* Copy "middle" record to new internal node */
    HDmemcpy(H5B2_INT_NREC(new_root,shared,0),H5B2_NAT_NREC(left_native,shared,mid_record),shared->type->nrec_size);

    /* Set internal node pointers to child nodes */
    new_root->node_ptrs[0].addr = left_addr;
    new_root->node_ptrs[1].addr = right_addr;

    /* Update record counts in child nodes */
    new_root->node_ptrs[0].node_nrec = *left_nrec = mid_record;
    new_root->node_ptrs[1].node_nrec = *right_nrec = old_root_nrec-(mid_record+1);

    /* Determine total number of records in new child nodes */
    if(bt2->depth>0) {
        unsigned u;             /* Local index variable */
        unsigned new_left_all_nrec;     /* New total number of records in left child */
        unsigned new_right_all_nrec;    /* New total number of records in right child */

        /* Compute total of all records in each child node */
        new_left_all_nrec = new_root->node_ptrs[0].node_nrec;
        for(u=0; u<(*left_nrec+1); u++)
            new_left_all_nrec += left_node_ptrs[u].all_nrec;

        new_right_all_nrec = new_root->node_ptrs[1].node_nrec;
        for(u=0; u<(*right_nrec+1); u++)
            new_right_all_nrec += right_node_ptrs[u].all_nrec;

        new_root->node_ptrs[0].all_nrec = new_left_all_nrec;
        new_root->node_ptrs[1].all_nrec = new_right_all_nrec;
    } /* end if */
    else {
        new_root->node_ptrs[0].all_nrec = new_root->node_ptrs[0].node_nrec;
        new_root->node_ptrs[1].all_nrec = new_root->node_ptrs[1].node_nrec;
    } /* end else */

    /* Update record count in new internal node */
    new_root->nrec = 1;

    /* Mark new internal node as dirty */
    new_root->cache_info.is_dirty = TRUE;

    /* Release new internal node */
    if (H5AC_unprotect(f, dxpl_id, H5AC_BT2_INT, bt2->root.addr, new_root, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree internal node")

    /* Release child nodes */
    if (H5AC_unprotect(f, dxpl_id, child_class, left_addr, left_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree leaf node")
    if (H5AC_unprotect(f, dxpl_id, child_class, right_addr, right_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree leaf node")

    /* Update depth of B-tree */
    bt2->depth++;

    /* Update pointer to B-tree's root node to pointer to new internal node */
    bt2->root.node_nrec = 1;

    /* Mark B-tree header as dirty */
    bt2->cache_info.is_dirty = TRUE;

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5B2_split_root */


/*-------------------------------------------------------------------------
 * Function:	H5B2_redistribute2
 *
 * Purpose:	Redistribute records between two nodes
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  9 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5B2_redistribute2(H5F_t *f, hid_t dxpl_id, unsigned depth, H5B2_internal_t *internal, unsigned idx)
{
    const H5AC_class_t *child_class;    /* Pointer to child node's class info */
    haddr_t left_addr, right_addr;      /* Addresses of left & right child nodes */
    void *left_child, *right_child;     /* Pointers to child nodes */
    unsigned *left_nrec, *right_nrec;   /* Pointers to child # of records */
    uint8_t *left_native, *right_native;    /* Pointers to childs' native records */
    H5B2_node_ptr_t *left_node_ptrs=NULL, *right_node_ptrs=NULL;/* Pointers to childs' node pointer info */
    H5B2_shared_t *shared;              /* B-tree's shared info */
    int left_moved_nrec=0, right_moved_nrec=0; /* Number of records moved, for internal redistrib */
    herr_t ret_value=SUCCEED;           /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5B2_redistribute2)

    HDassert(f);
    HDassert(internal);

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(internal->shared);
    HDassert(shared);

    /* Check for the kind of B-tree node to redistribute */
    if(depth>1) {
        H5B2_internal_t *left_internal;         /* Pointer to left internal node */
        H5B2_internal_t *right_internal;        /* Pointer to right internal node */

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_INT;
        left_addr = internal->node_ptrs[idx].addr;
        right_addr = internal->node_ptrs[idx+1].addr;

        /* Lock left & right B-tree child nodes */
        if (NULL == (left_internal = H5AC_protect(f, dxpl_id, child_class, left_addr, &(internal->node_ptrs[idx].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
        if (NULL == (right_internal = H5AC_protect(f, dxpl_id, child_class, right_addr, &(internal->node_ptrs[idx+1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* More setup for child nodes */
        left_child = left_internal;
        right_child = right_internal;
        left_nrec = &(left_internal->nrec);
        right_nrec = &(right_internal->nrec);
        left_native = left_internal->int_native;
        right_native = right_internal->int_native;
        left_node_ptrs = left_internal->node_ptrs;
        right_node_ptrs = right_internal->node_ptrs;

        /* Mark child nodes as dirty now */
        left_internal->cache_info.is_dirty = TRUE;
        right_internal->cache_info.is_dirty = TRUE;
    } /* end if */
    else {
        H5B2_leaf_t *left_leaf;         /* Pointer to left leaf node */
        H5B2_leaf_t *right_leaf;        /* Pointer to right leaf node */

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_LEAF;
        left_addr = internal->node_ptrs[idx].addr;
        right_addr = internal->node_ptrs[idx+1].addr;

        /* Lock left & right B-tree child nodes */
        if (NULL == (left_leaf = H5AC_protect(f, dxpl_id, child_class, left_addr, &(internal->node_ptrs[idx].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
        if (NULL == (right_leaf = H5AC_protect(f, dxpl_id, child_class, right_addr, &(internal->node_ptrs[idx+1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* More setup for child nodes */
        left_child = left_leaf;
        right_child = right_leaf;
        left_nrec = &(left_leaf->nrec);
        right_nrec = &(right_leaf->nrec);
        left_native = left_leaf->leaf_native;
        right_native = right_leaf->leaf_native;

        /* Mark child nodes as dirty now */
        left_leaf->cache_info.is_dirty = TRUE;
        right_leaf->cache_info.is_dirty = TRUE;
    } /* end else */

    /* Determine whether to shuffle records left or right */
    if(*left_nrec<*right_nrec) {
        /* Moving record from right node to left */

        unsigned new_right_nrec = (*left_nrec+*right_nrec)/2;             /* New number of records for right child */
        unsigned move_nrec = *right_nrec - new_right_nrec;      /* Number of records to move from right node to left */

        /* Copy record from parent node down into left child */
        HDmemcpy(H5B2_NAT_NREC(left_native,shared,*left_nrec),H5B2_INT_NREC(internal,shared,idx),shared->type->nrec_size);

        /* See if we need to move records from right node */
        if(move_nrec>1)
            HDmemcpy(H5B2_NAT_NREC(left_native,shared,(*left_nrec+1)),H5B2_NAT_NREC(right_native,shared,0),shared->type->nrec_size*(move_nrec-1));

        /* Move record from right node into parent node */
        HDmemcpy(H5B2_INT_NREC(internal,shared,idx),H5B2_NAT_NREC(right_native,shared,(move_nrec-1)),shared->type->nrec_size);

        /* Slide records in right node down */
        HDmemmove(H5B2_NAT_NREC(right_native,shared,0),H5B2_NAT_NREC(right_native,shared,move_nrec),shared->type->nrec_size*new_right_nrec);

        /* Handle node pointers, if we have an internal node */
        if(depth>1) {
            int moved_nrec=move_nrec;   /* Total number of records moved, for internal redistrib */
            unsigned u;             /* Local index variable */

            /* Count the number of records being moved */
            for(u=0; u<move_nrec; u++)
                moved_nrec += right_node_ptrs[u].all_nrec;
            left_moved_nrec = moved_nrec;
            right_moved_nrec = -moved_nrec;

            /* Copy node pointers from right node to left */
            HDmemcpy(&(left_node_ptrs[*left_nrec+1]),&(right_node_ptrs[0]),sizeof(H5B2_node_ptr_t)*move_nrec);

            /* Slide node pointers in right node down */
            HDmemmove(&(right_node_ptrs[0]),&(right_node_ptrs[move_nrec]),sizeof(H5B2_node_ptr_t)*(new_right_nrec+1));
        } /* end if */

        /* Update number of records in child nodes */
        *left_nrec += move_nrec;
        *right_nrec = new_right_nrec;
    } /* end if */
    else {
        /* Moving record from left node to right */

        unsigned new_left_nrec = (*left_nrec+*right_nrec)/2;    /* New number of records for left child */
        unsigned move_nrec = *left_nrec - new_left_nrec;        /* Number of records to move from left node to right */

        /* Slide records in right node up */
        HDmemmove(H5B2_NAT_NREC(right_native,shared,move_nrec),
                H5B2_NAT_NREC(right_native,shared,0),
                shared->type->nrec_size*(*right_nrec));

        /* Copy record from parent node down into right child */
        HDmemcpy(H5B2_NAT_NREC(right_native,shared,(move_nrec-1)),H5B2_INT_NREC(internal,shared,idx),shared->type->nrec_size);

        /* See if we need to move records from left node */
        if(move_nrec>1)
            HDmemcpy(H5B2_NAT_NREC(right_native,shared,0),H5B2_NAT_NREC(left_native,shared,((*left_nrec-move_nrec)+1)),shared->type->nrec_size*(move_nrec-1));

        /* Move record from left node into parent node */
        HDmemcpy(H5B2_INT_NREC(internal,shared,idx),H5B2_NAT_NREC(left_native,shared,(*left_nrec-move_nrec)),shared->type->nrec_size);

        /* Handle node pointers, if we have an internal node */
        if(depth>1) {
            int moved_nrec=move_nrec;   /* Total number of records moved, for internal redistrib */
            unsigned u;             /* Local index variable */

            /* Slide node pointers in right node up */
            HDmemmove(&(right_node_ptrs[move_nrec]),&(right_node_ptrs[0]),sizeof(H5B2_node_ptr_t)*(*right_nrec+1));

            /* Copy node pointers from left node to right */
            HDmemcpy(&(right_node_ptrs[0]),&(left_node_ptrs[new_left_nrec+1]),sizeof(H5B2_node_ptr_t)*move_nrec);

            /* Count the number of records being moved */
            for(u=0; u<move_nrec; u++)
                moved_nrec += right_node_ptrs[u].all_nrec;
            left_moved_nrec = -moved_nrec;
            right_moved_nrec = moved_nrec;
        } /* end if */

        /* Update number of records in child nodes */
        *left_nrec = new_left_nrec;
        *right_nrec += move_nrec;
    } /* end else */

    /* Update # of records in child nodes */
    internal->node_ptrs[idx].node_nrec = *left_nrec;
    internal->node_ptrs[idx+1].node_nrec = *right_nrec;

    /* Update total # of records in child B-trees */
    if(depth>1) {
        internal->node_ptrs[idx].all_nrec += left_moved_nrec;
        internal->node_ptrs[idx+1].all_nrec += right_moved_nrec;
    } /* end if */
    else {
        internal->node_ptrs[idx].all_nrec = internal->node_ptrs[idx].node_nrec;
        internal->node_ptrs[idx+1].all_nrec = internal->node_ptrs[idx+1].node_nrec;
    } /* end else */

    /* Unlock child nodes */
    if (H5AC_unprotect(f, dxpl_id, child_class, left_addr, left_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")
    if (H5AC_unprotect(f, dxpl_id, child_class, right_addr, right_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5B2_redistribute2 */


/*-------------------------------------------------------------------------
 * Function:	H5B2_split2
 *
 * Purpose:	Perform a 2->3 node split
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  9 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5B2_split2(H5F_t *f, hid_t dxpl_id, unsigned depth, H5B2_node_ptr_t *curr_node_ptr,
    H5AC_info_t *parent_cache_info, H5B2_internal_t *internal, unsigned idx)
{
    const H5AC_class_t *child_class;    /* Pointer to child node's class info */
    haddr_t left_addr, right_addr;      /* Addresses of left & right child nodes */
    haddr_t middle_addr;                /* Address of middle child node */
    void *left_child, *right_child;     /* Pointers to left & right child nodes */
    void *middle_child;                 /* Pointer to middle child node */
    unsigned *left_nrec, *right_nrec;   /* Pointers to left & right child # of records */
    unsigned *middle_nrec;              /* Pointer to middle child # of records */
    uint8_t *left_native, *right_native;    /* Pointers to left & right children's native records */
    uint8_t *middle_native;             /* Pointer to middle child's native records */
    H5B2_node_ptr_t *left_node_ptrs=NULL, *right_node_ptrs=NULL;/* Pointers to childs' node pointer info */
    H5B2_node_ptr_t *middle_node_ptrs=NULL;/* Pointers to childs' node pointer info */
    H5B2_shared_t *shared;              /* B-tree's shared info */
    int left_moved_nrec=0, right_moved_nrec=0; /* Number of records moved, for internal split */
    int middle_moved_nrec=0;            /* Number of records moved, for internal split */
    herr_t ret_value=SUCCEED;           /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5B2_split2)

    HDassert(f);
    HDassert(internal);

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(internal->shared);
    HDassert(shared);

    /* Slide records in parent node up one space, to make room for promoted record */
    HDmemmove(H5B2_INT_NREC(internal,shared,idx+2),H5B2_INT_NREC(internal,shared,idx+1),shared->type->nrec_size*(internal->nrec-(idx+1)));
    HDmemmove(&(internal->node_ptrs[idx+2]),&(internal->node_ptrs[idx+1]),sizeof(H5B2_node_ptr_t)*(internal->nrec-idx));

    /* Check for the kind of B-tree node to split */
    if(depth>1) {
        H5B2_internal_t *left_internal;         /* Pointer to left internal node */
        H5B2_internal_t *middle_internal;       /* Pointer to middle internal node */
        H5B2_internal_t *right_internal;        /* Pointer to right internal node */

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_INT;
        left_addr = internal->node_ptrs[idx].addr;
        right_addr = internal->node_ptrs[idx+2].addr;

        /* Lock left & right B-tree child nodes */
        if (NULL == (left_internal = H5AC_protect(f, dxpl_id, child_class, left_addr, &(internal->node_ptrs[idx].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")
        if (NULL == (right_internal = H5AC_protect(f, dxpl_id, child_class, right_addr, &(internal->node_ptrs[idx+2].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")

        /* Create new empty "middle" internal node */
        internal->node_ptrs[idx+1].all_nrec=internal->node_ptrs[idx+1].node_nrec=0;
        if(H5B2_create_internal(f, dxpl_id, internal->shared, &(internal->node_ptrs[idx+1]))<0)
	    HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "unable to create new internal node")

        /* Setup information for unlocking middle child node */
        middle_addr = internal->node_ptrs[idx+1].addr;

        /* Lock "middle" internal node */
        if (NULL == (middle_internal = H5AC_protect(f, dxpl_id, child_class, middle_addr, &(internal->node_ptrs[idx+1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")

        /* More setup for accessing child node information */
        left_child = left_internal;
        middle_child = middle_internal;
        right_child = right_internal;
        left_nrec = &(left_internal->nrec);
        middle_nrec = &(middle_internal->nrec);
        right_nrec = &(right_internal->nrec);
        left_native = left_internal->int_native;
        middle_native = middle_internal->int_native;
        right_native = right_internal->int_native;
        left_node_ptrs = left_internal->node_ptrs;
        middle_node_ptrs = middle_internal->node_ptrs;
        right_node_ptrs = right_internal->node_ptrs;

        /* Mark child nodes as dirty now */
        left_internal->cache_info.is_dirty = TRUE;
        middle_internal->cache_info.is_dirty = TRUE;
        right_internal->cache_info.is_dirty = TRUE;
    } /* end if */
    else {
        H5B2_leaf_t *left_leaf;         /* Pointer to left leaf node */
        H5B2_leaf_t *middle_leaf;       /* Pointer to middle leaf node */
        H5B2_leaf_t *right_leaf;        /* Pointer to right leaf node */

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_LEAF;
        left_addr = internal->node_ptrs[idx].addr;
        right_addr = internal->node_ptrs[idx+2].addr;

        /* Lock left & right B-tree child nodes */
        if (NULL == (left_leaf = H5AC_protect(f, dxpl_id, child_class, left_addr, &(internal->node_ptrs[idx].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
        if (NULL == (right_leaf = H5AC_protect(f, dxpl_id, child_class, right_addr, &(internal->node_ptrs[idx+2].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* Create new empty "middle" leaf node */
        internal->node_ptrs[idx+1].all_nrec=internal->node_ptrs[idx+1].node_nrec=0;
        if(H5B2_create_leaf(f, dxpl_id, internal->shared, &(internal->node_ptrs[idx+1]))<0)
	    HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "unable to create new leaf node")

        /* Setup information for unlocking middle child node */
        middle_addr = internal->node_ptrs[idx+1].addr;

        /* Lock "middle" leaf node */
        if (NULL == (middle_leaf = H5AC_protect(f, dxpl_id, child_class, middle_addr, &(internal->node_ptrs[idx+1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* More setup for accessing child node information */
        left_child = left_leaf;
        middle_child = middle_leaf;
        right_child = right_leaf;
        left_nrec = &(left_leaf->nrec);
        middle_nrec = &(middle_leaf->nrec);
        right_nrec = &(right_leaf->nrec);
        left_native = left_leaf->leaf_native;
        middle_native = middle_leaf->leaf_native;
        right_native = right_leaf->leaf_native;

        /* Mark child nodes as dirty now */
        left_leaf->cache_info.is_dirty = TRUE;
        middle_leaf->cache_info.is_dirty = TRUE;
        right_leaf->cache_info.is_dirty = TRUE;
    } /* end else */

    /* Sanity check */
    HDassert(*left_nrec==*right_nrec);

    /* Redistribute records */
    {
        /* Compute new # of records in each node */
        unsigned total_nrec = *left_nrec + *right_nrec + 1;
        unsigned new_middle_nrec = (total_nrec-2)/3;
        unsigned new_left_nrec = ((total_nrec-2)-new_middle_nrec)/2;
        unsigned new_right_nrec = (total_nrec-2)-(new_left_nrec+new_middle_nrec);

        /* Fill new middle node */
        {
            unsigned curr_middle_idx=0;

            /* Copy record(s) from left node to proper location */
            if(new_left_nrec<(*left_nrec-1)) {
                curr_middle_idx=*left_nrec-(new_left_nrec+1);
                HDmemcpy(H5B2_NAT_NREC(middle_native,shared,0),H5B2_NAT_NREC(left_native,shared,(new_left_nrec+1)),shared->type->nrec_size*curr_middle_idx);
            } /* end if */

            /* Copy record from parent node to proper location */
            HDmemcpy(H5B2_NAT_NREC(middle_native,shared,curr_middle_idx),H5B2_INT_NREC(internal,shared,idx),shared->type->nrec_size);
            curr_middle_idx++;

            /* Copy record(s) from right node to proper location */
            if(new_right_nrec<(*right_nrec-1))
                HDmemcpy(H5B2_NAT_NREC(middle_native,shared,curr_middle_idx),H5B2_NAT_NREC(right_native,shared,0),shared->type->nrec_size*(*right_nrec-(new_right_nrec+1)));

            /* Copy node pointers from left and right nodes into middle node */
            if(depth>1) {
                int moved_nrec;         /* Total number of records moved, for internal redistrib */
                unsigned move_nptrs;    /* Number of node pointers to move */
                unsigned u;             /* Local index variable */

                /* Start tracking the total number of records in middle node */
                middle_moved_nrec = new_middle_nrec;

                /* Copy node pointers from left node */
                move_nptrs = (*left_nrec-new_left_nrec);
                HDmemcpy(&(middle_node_ptrs[0]),&(left_node_ptrs[new_left_nrec+1]),sizeof(H5B2_node_ptr_t)*move_nptrs);

                /* Count the number of records being moved from the left node */
                for(u=0, moved_nrec=0; u<move_nptrs; u++)
                    moved_nrec += middle_node_ptrs[u].all_nrec;
                left_moved_nrec = -(moved_nrec+(*left_nrec-new_left_nrec));
                middle_moved_nrec += moved_nrec;

                /* Copy node pointers from right node */
                move_nptrs = (*right_nrec-new_right_nrec);
                HDmemcpy(&(middle_node_ptrs[(*left_nrec-new_left_nrec)]),&(right_node_ptrs[0]),sizeof(H5B2_node_ptr_t)*move_nptrs);

                /* Count the number of records being moved from the right node */
                for(u=0, moved_nrec=0; u<move_nptrs; u++)
                    moved_nrec += right_node_ptrs[u].all_nrec;
                right_moved_nrec = -(moved_nrec+(*right_nrec-new_right_nrec));
                middle_moved_nrec += moved_nrec;

                /* Slide node pointers in right node down */
                HDmemmove(&(right_node_ptrs[0]),&(right_node_ptrs[move_nptrs]),sizeof(H5B2_node_ptr_t)*(new_right_nrec+1));
            } /* end if */

        } /* end block */

        /* Update # of records in middle node */
        *middle_nrec=new_middle_nrec;

        /* Promote records to parent node from left & right nodes */
        HDmemcpy(H5B2_INT_NREC(internal,shared,idx),H5B2_NAT_NREC(left_native,shared,new_left_nrec),shared->type->nrec_size);
        HDmemcpy(H5B2_INT_NREC(internal,shared,idx+1),H5B2_NAT_NREC(right_native,shared,(*right_nrec-(new_right_nrec+1))),shared->type->nrec_size);

        /* Update # of records in left node */
        *left_nrec = new_left_nrec;

        /* Slide records in right node to proper position */
        HDmemmove(H5B2_NAT_NREC(right_native,shared,0),H5B2_NAT_NREC(right_native,shared,(*right_nrec-new_right_nrec)),shared->type->nrec_size*new_right_nrec);

        /* Update # of records in right node */
        *right_nrec = new_right_nrec;
    } /* end block */

    /* Update # of records in child nodes */
    internal->node_ptrs[idx].node_nrec = *left_nrec;
    internal->node_ptrs[idx+1].node_nrec = *middle_nrec;
    internal->node_ptrs[idx+2].node_nrec = *right_nrec;

    /* Update total # of records in child B-trees */
    if(depth>1) {
        internal->node_ptrs[idx].all_nrec += left_moved_nrec;
        internal->node_ptrs[idx+1].all_nrec = middle_moved_nrec;
        internal->node_ptrs[idx+2].all_nrec += right_moved_nrec;
    } /* end if */
    else {
        internal->node_ptrs[idx].all_nrec = internal->node_ptrs[idx].node_nrec;
        internal->node_ptrs[idx+1].all_nrec = internal->node_ptrs[idx+1].node_nrec;
        internal->node_ptrs[idx+2].all_nrec = internal->node_ptrs[idx+2].node_nrec;
    } /* end else */


    /* Update # of records in parent node */
    internal->nrec++;

    /* Mark parent as dirty */
    internal->cache_info.is_dirty = TRUE;

    /* Update grandparent info */
    curr_node_ptr->node_nrec++;

    /* Mark grandparent as dirty */
    parent_cache_info->is_dirty = TRUE;

    /* Unlock child nodes */
    if (H5AC_unprotect(f, dxpl_id, child_class, left_addr, left_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")
    if (H5AC_unprotect(f, dxpl_id, child_class, middle_addr, middle_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")
    if (H5AC_unprotect(f, dxpl_id, child_class, right_addr, right_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5B2_split2 */


/*-------------------------------------------------------------------------
 * Function:	H5B2_redistribute3
 *
 * Purpose:	Redistribute records between three nodes
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  9 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5B2_redistribute3(H5F_t *f, hid_t dxpl_id, unsigned depth, H5B2_internal_t *internal, unsigned idx)
{
    const H5AC_class_t *child_class;    /* Pointer to child node's class info */
    haddr_t left_addr, right_addr;      /* Addresses of left & right child nodes */
    haddr_t middle_addr;                /* Address of middle child node */
    void *left_child, *right_child;     /* Pointers to child nodes */
    void *middle_child;                 /* Pointers to middle child node */
    unsigned *left_nrec, *right_nrec;   /* Pointers to child # of records */
    unsigned *middle_nrec;              /* Pointers to middle child # of records */
    uint8_t *left_native, *right_native;    /* Pointers to childs' native records */
    uint8_t *middle_native;             /* Pointers to middle child's native records */
    H5B2_shared_t *shared;              /* B-tree's shared info */
    H5B2_node_ptr_t *left_node_ptrs=NULL, *right_node_ptrs=NULL;/* Pointers to childs' node pointer info */
    H5B2_node_ptr_t *middle_node_ptrs=NULL;/* Pointers to childs' node pointer info */
    int left_moved_nrec=0, right_moved_nrec=0; /* Number of records moved, for internal split */
    int middle_moved_nrec=0;            /* Number of records moved, for internal split */
    herr_t ret_value=SUCCEED;           /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5B2_redistribute3)

    HDassert(f);
    HDassert(internal);

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(internal->shared);
    HDassert(shared);

    /* Check for the kind of B-tree node to redistribute */
    if(depth>1) {
        H5B2_internal_t *left_internal;         /* Pointer to left internal node */
        H5B2_internal_t *middle_internal;       /* Pointer to middle internal node */
        H5B2_internal_t *right_internal;        /* Pointer to right internal node */

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_INT;
        left_addr = internal->node_ptrs[idx-1].addr;
        middle_addr = internal->node_ptrs[idx].addr;
        right_addr = internal->node_ptrs[idx+1].addr;

        /* Lock B-tree child nodes */
        if (NULL == (left_internal = H5AC_protect(f, dxpl_id, child_class, left_addr, &(internal->node_ptrs[idx-1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")
        if (NULL == (middle_internal = H5AC_protect(f, dxpl_id, child_class, middle_addr, &(internal->node_ptrs[idx].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")
        if (NULL == (right_internal = H5AC_protect(f, dxpl_id, child_class, right_addr, &(internal->node_ptrs[idx+1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")

        /* More setup for child nodes */
        left_child = left_internal;
        middle_child = middle_internal;
        right_child = right_internal;
        left_nrec = &(left_internal->nrec);
        middle_nrec = &(middle_internal->nrec);
        right_nrec = &(right_internal->nrec);
        left_native = left_internal->int_native;
        middle_native = middle_internal->int_native;
        right_native = right_internal->int_native;
        left_node_ptrs = left_internal->node_ptrs;
        middle_node_ptrs = middle_internal->node_ptrs;
        right_node_ptrs = right_internal->node_ptrs;

        /* Mark child nodes as dirty now */
        left_internal->cache_info.is_dirty = TRUE;
        middle_internal->cache_info.is_dirty = TRUE;
        right_internal->cache_info.is_dirty = TRUE;
    } /* end if */
    else {
        H5B2_leaf_t *left_leaf;         /* Pointer to left leaf node */
        H5B2_leaf_t *middle_leaf;       /* Pointer to middle leaf node */
        H5B2_leaf_t *right_leaf;        /* Pointer to right leaf node */

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_LEAF;
        left_addr = internal->node_ptrs[idx-1].addr;
        middle_addr = internal->node_ptrs[idx].addr;
        right_addr = internal->node_ptrs[idx+1].addr;

        /* Lock B-tree child nodes */
        if (NULL == (left_leaf = H5AC_protect(f, dxpl_id, child_class, left_addr, &(internal->node_ptrs[idx-1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
        if (NULL == (middle_leaf = H5AC_protect(f, dxpl_id, child_class, middle_addr, &(internal->node_ptrs[idx].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
        if (NULL == (right_leaf = H5AC_protect(f, dxpl_id, child_class, right_addr, &(internal->node_ptrs[idx+1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* More setup for child nodes */
        left_child = left_leaf;
        middle_child = middle_leaf;
        right_child = right_leaf;
        left_nrec = &(left_leaf->nrec);
        middle_nrec = &(middle_leaf->nrec);
        right_nrec = &(right_leaf->nrec);
        left_native = left_leaf->leaf_native;
        middle_native = middle_leaf->leaf_native;
        right_native = right_leaf->leaf_native;

        /* Mark child nodes as dirty now */
        left_leaf->cache_info.is_dirty = TRUE;
        middle_leaf->cache_info.is_dirty = TRUE;
        right_leaf->cache_info.is_dirty = TRUE;
    } /* end else */

    /* Redistribute records */
    {
        /* Compute new # of records in each node */
        unsigned total_nrec = *left_nrec + *middle_nrec + *right_nrec + 2;
        unsigned new_middle_nrec = (total_nrec-2)/3;
        unsigned new_left_nrec = ((total_nrec-2)-new_middle_nrec)/2;
        unsigned new_right_nrec = (total_nrec-2)-(new_left_nrec+new_middle_nrec);

        /* Move records into left node */
        if(new_left_nrec>*left_nrec) {
            unsigned moved_middle_nrec=0;      /* Number of records moved into left node */

            /* Move left parent record down to left node */
            HDmemcpy(H5B2_NAT_NREC(left_native,shared,*left_nrec),H5B2_INT_NREC(internal,shared,idx-1),shared->type->nrec_size);

            /* Move records from middle node into left node */
            if((new_left_nrec-1)>*left_nrec) {
                moved_middle_nrec = new_left_nrec-(*left_nrec+1);
                HDmemcpy(H5B2_NAT_NREC(left_native,shared,*left_nrec+1),H5B2_NAT_NREC(middle_native,shared,0),shared->type->nrec_size*moved_middle_nrec);
            } /* end if */

            /* Move record from middle node up to parent node */
            HDmemcpy(H5B2_INT_NREC(internal,shared,idx-1),H5B2_NAT_NREC(middle_native,shared,moved_middle_nrec),shared->type->nrec_size);
            moved_middle_nrec++;

            /* Slide records in middle node down */
            HDmemmove(H5B2_NAT_NREC(middle_native,shared,0),H5B2_NAT_NREC(middle_native,shared,moved_middle_nrec),shared->type->nrec_size*(*middle_nrec-moved_middle_nrec));

            /* Move node pointers also if this is an internal node */
            if(depth>1) {
                int moved_nrec;         /* Total number of records moved, for internal redistrib */
                unsigned move_nptrs;    /* Number of node pointers to move */
                unsigned u;             /* Local index variable */

                /* Move middle node pointers into left node */
                move_nptrs = new_left_nrec - *left_nrec;
                HDmemcpy(&(left_node_ptrs[*left_nrec+1]),&(middle_node_ptrs[0]),sizeof(H5B2_node_ptr_t)*move_nptrs);

                /* Count the number of records being moved into the left node */
                for(u=0, moved_nrec=0; u<move_nptrs; u++)
                    moved_nrec += middle_node_ptrs[u].all_nrec;
                left_moved_nrec = moved_nrec+move_nptrs;
                middle_moved_nrec -= moved_nrec+move_nptrs;

                /* Slide the node pointers in middle node down */
                HDmemmove(&(middle_node_ptrs[0]),&(middle_node_ptrs[move_nptrs]),sizeof(H5B2_node_ptr_t)*((*middle_nrec-move_nptrs)+1));
            } /* end if */
        } /* end if */

        /* Move records into right node */
        if(new_right_nrec>*right_nrec) {

            /* Slide records in right node up */
            HDmemmove(H5B2_NAT_NREC(right_native,shared,(new_right_nrec-*right_nrec)),H5B2_NAT_NREC(right_native,shared,0),shared->type->nrec_size*(*right_nrec));

            /* Move right parent record down to right node */
            HDmemcpy(H5B2_NAT_NREC(right_native,shared,(new_right_nrec-(*right_nrec+1))),H5B2_INT_NREC(internal,shared,idx),shared->type->nrec_size);

            /* Move records from middle node into right node */
            if((new_right_nrec-1)>*right_nrec)
                HDmemcpy(H5B2_NAT_NREC(right_native,shared,0),H5B2_NAT_NREC(middle_native,shared,new_middle_nrec+1),shared->type->nrec_size*(new_right_nrec-(*right_nrec+1)));

            /* Move record from middle node up to parent node */
            HDmemcpy(H5B2_INT_NREC(internal,shared,idx),H5B2_NAT_NREC(middle_native,shared,new_middle_nrec),shared->type->nrec_size);

            /* Move node pointers also if this is an internal node */
            if(depth>1) {
                int moved_nrec;         /* Total number of records moved, for internal redistrib */
                unsigned move_nptrs;    /* Number of node pointers to move */
                unsigned u;             /* Local index variable */

                /* Slide the node pointers in right node up */
                move_nptrs = new_right_nrec - *right_nrec;
                HDmemmove(&(right_node_ptrs[move_nptrs]),&(right_node_ptrs[0]),sizeof(H5B2_node_ptr_t)*(*right_nrec+1));

                /* Move middle node pointers into right node */
                HDmemcpy(&(right_node_ptrs[0]),&(middle_node_ptrs[new_middle_nrec+1]),sizeof(H5B2_node_ptr_t)*move_nptrs);

                /* Count the number of records being moved into the right node */
                for(u=0, moved_nrec=0; u<move_nptrs; u++)
                    moved_nrec += right_node_ptrs[u].all_nrec;
                right_moved_nrec = moved_nrec+move_nptrs;
                middle_moved_nrec -= moved_nrec+move_nptrs;
            } /* end if */
        } /* end if */

        /* Update # of records in nodes */
        *left_nrec = new_left_nrec;
        *middle_nrec = new_middle_nrec;
        *right_nrec = new_right_nrec;
    } /* end block */

    /* Update # of records in child nodes */
    internal->node_ptrs[idx-1].node_nrec = *left_nrec;
    internal->node_ptrs[idx].node_nrec = *middle_nrec;
    internal->node_ptrs[idx+1].node_nrec = *right_nrec;

    /* Update total # of records in child B-trees */
    if(depth>1) {
        internal->node_ptrs[idx-1].all_nrec += left_moved_nrec;
        internal->node_ptrs[idx].all_nrec += middle_moved_nrec;
        internal->node_ptrs[idx+1].all_nrec += right_moved_nrec;
    } /* end if */
    else {
        internal->node_ptrs[idx-1].all_nrec = internal->node_ptrs[idx-1].node_nrec;
        internal->node_ptrs[idx].all_nrec = internal->node_ptrs[idx].node_nrec;
        internal->node_ptrs[idx+1].all_nrec = internal->node_ptrs[idx+1].node_nrec;
    } /* end else */

    /* Mark parent as dirty */
    internal->cache_info.is_dirty = TRUE;

    /* Unlock child nodes */
    if (H5AC_unprotect(f, dxpl_id, child_class, left_addr, left_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")
    if (H5AC_unprotect(f, dxpl_id, child_class, middle_addr, middle_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")
    if (H5AC_unprotect(f, dxpl_id, child_class, right_addr, right_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5B2_redistribute3 */


/*-------------------------------------------------------------------------
 * Function:	H5B2_split3
 *
 * Purpose:	Perform a 3->4 node split
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb 10 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5B2_split3(H5F_t *f, hid_t dxpl_id, unsigned depth, H5B2_node_ptr_t *curr_node_ptr,
    H5AC_info_t *parent_cache_info, H5B2_internal_t *internal, unsigned idx)
{
    const H5AC_class_t *child_class;    /* Pointer to child node's class info */
    haddr_t left_addr, right_addr;      /* Addresses of left & right child nodes */
    haddr_t middle_addr;                /* Address of middle child node */
    haddr_t new_addr;                   /* Address of new child node */
    void *left_child, *right_child;     /* Pointers to left & right child nodes */
    void *middle_child;                 /* Pointer to middle child node */
    void *new_child;                    /* Pointer to new child node */
    unsigned *left_nrec, *right_nrec;   /* Pointers to left & right child # of records */
    unsigned *middle_nrec;              /* Pointer to middle child # of records */
    unsigned *new_nrec;                 /* Pointer to new child # of records */
    uint8_t *left_native, *right_native;    /* Pointers to left & right children's native records */
    uint8_t *middle_native;             /* Pointer to middle child's native records */
    uint8_t *new_native;                /* Pointer to new child's native records */
    H5B2_shared_t *shared;              /* B-tree's shared info */
    herr_t ret_value=SUCCEED;           /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5B2_split3)

    HDassert(f);
    HDassert(internal);

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(internal->shared);
    HDassert(shared);

    /* Slide records in parent node up one space, to make room for promoted record */
    HDmemmove(H5B2_INT_NREC(internal,shared,idx+2),H5B2_INT_NREC(internal,shared,idx+1),shared->type->nrec_size*(internal->nrec-(idx+1)));
    HDmemmove(&(internal->node_ptrs[idx+2]),&(internal->node_ptrs[idx+1]),sizeof(H5B2_node_ptr_t)*(internal->nrec-idx));

    /* Check for the kind of B-tree node to split */
    if(depth>1) {
HDfprintf(stderr,"%s: splitting internal node! (need to handle node_ptrs)\n",FUNC);
HGOTO_ERROR(H5E_BTREE, H5E_CANTSPLIT, FAIL, "unable to split nodes")
    } /* end if */
    else {
        H5B2_leaf_t *left_leaf;         /* Pointer to left leaf node */
        H5B2_leaf_t *right_leaf;        /* Pointer to right leaf node */
        H5B2_leaf_t *middle_leaf;       /* Pointer to middle leaf node */
        H5B2_leaf_t *new_leaf;          /* Pointer to new leaf node */

        /* Setup information for unlocking child nodes */
        child_class = H5AC_BT2_LEAF;
        left_addr = internal->node_ptrs[idx-1].addr;
        middle_addr = internal->node_ptrs[idx].addr;
        right_addr = internal->node_ptrs[idx+2].addr;

        /* Lock left & right B-tree child nodes */
        if (NULL == (left_leaf = H5AC_protect(f, dxpl_id, child_class, left_addr, &(internal->node_ptrs[idx-1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
        if (NULL == (middle_leaf = H5AC_protect(f, dxpl_id, child_class, middle_addr, &(internal->node_ptrs[idx].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")
        if (NULL == (right_leaf = H5AC_protect(f, dxpl_id, child_class, right_addr, &(internal->node_ptrs[idx+2].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* Create new empty leaf node */
        internal->node_ptrs[idx+1].all_nrec=internal->node_ptrs[idx+1].node_nrec=0;
        if(H5B2_create_leaf(f, dxpl_id, internal->shared, &(internal->node_ptrs[idx+1]))<0)
	    HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "unable to create new leaf node")

        /* Setup information for unlocking middle child node */
        new_addr = internal->node_ptrs[idx+1].addr;

        /* Lock "new" leaf node */
        if (NULL == (new_leaf = H5AC_protect(f, dxpl_id, child_class, new_addr, &(internal->node_ptrs[idx+1].node_nrec), internal->shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* More setup for accessing child node information */
        left_child = left_leaf;
        middle_child = middle_leaf;
        new_child = new_leaf;
        right_child = right_leaf;
        left_nrec = &(left_leaf->nrec);
        middle_nrec = &(middle_leaf->nrec);
        new_nrec = &(new_leaf->nrec);
        right_nrec = &(right_leaf->nrec);
        left_native = left_leaf->leaf_native;
        middle_native = middle_leaf->leaf_native;
        new_native = new_leaf->leaf_native;
        right_native = right_leaf->leaf_native;

        /* Mark child nodes as dirty now */
        left_leaf->cache_info.is_dirty = TRUE;
        middle_leaf->cache_info.is_dirty = TRUE;
        new_leaf->cache_info.is_dirty = TRUE;
        right_leaf->cache_info.is_dirty = TRUE;
    } /* end else */

    /* Sanity check */
    HDassert(*left_nrec==*right_nrec);
    HDassert(*left_nrec==*middle_nrec);

    /* Redistribute records */
    {
        /* Compute new # of records in each node */
        unsigned total_nrec = *left_nrec + *middle_nrec + *right_nrec + 2;
        unsigned new_new_nrec = (total_nrec-3)/4;
        unsigned new_middle_nrec = ((total_nrec-3)-new_new_nrec)/3;
        unsigned new_left_nrec = ((total_nrec-3)-(new_middle_nrec+new_new_nrec))/2;
        unsigned new_right_nrec = (total_nrec-3)-(new_left_nrec+new_middle_nrec+new_new_nrec);

        /* Partially fill new node from right node */
        {
            unsigned right_nrec_move = *right_nrec-new_right_nrec;

            /* Move right record down from parent into new node */
            HDmemcpy(H5B2_NAT_NREC(new_native,shared,(new_new_nrec-right_nrec_move)),H5B2_INT_NREC(internal,shared,idx),shared->type->nrec_size);

            /* Move records from right node to new node */
            HDmemcpy(H5B2_NAT_NREC(new_native,shared,((new_new_nrec-right_nrec_move)+1)),H5B2_NAT_NREC(right_native,shared,0),shared->type->nrec_size*(right_nrec_move-1));

            /* Move record from right node up to parent node */
            HDmemcpy(H5B2_INT_NREC(internal,shared,idx+1),H5B2_NAT_NREC(right_native,shared,(right_nrec_move-1)),shared->type->nrec_size);

            /* Slide records in right node down */
            HDmemmove(H5B2_NAT_NREC(right_native,shared,0),H5B2_NAT_NREC(right_native,shared,right_nrec_move),shared->type->nrec_size*new_right_nrec);
        } /* end block */

        /* Finish filling new node from middle node */
        {
            unsigned new_nrec_move = new_new_nrec-(*right_nrec-new_right_nrec);

            /* Move records from middle node to new node */
            HDmemcpy(H5B2_NAT_NREC(new_native,shared,0),H5B2_NAT_NREC(middle_native,shared,(*middle_nrec-new_nrec_move)),shared->type->nrec_size*new_nrec_move);
            
            /* Move record from middle node up to parent node */
            HDmemcpy(H5B2_INT_NREC(internal,shared,idx),H5B2_NAT_NREC(middle_native,shared,((*middle_nrec-new_nrec_move)-1)),shared->type->nrec_size);

            /* Slide records in middle node up */
            HDmemmove(H5B2_NAT_NREC(middle_native,shared,(new_middle_nrec-((*middle_nrec-new_nrec_move)-1))),H5B2_NAT_NREC(middle_native,shared,0),shared->type->nrec_size*(*middle_nrec-(new_nrec_move+1)));
        } /* end block */

        /* Fill middle node from left node */
        {
            unsigned left_nrec_move = *left_nrec - new_left_nrec;

            /* Move record from parent node down to middle node */
            HDmemcpy(H5B2_NAT_NREC(middle_native,shared,(left_nrec_move-1)),H5B2_INT_NREC(internal,shared,idx-1),shared->type->nrec_size);

            /* Move records from left node to middle node */
            HDmemcpy(H5B2_NAT_NREC(middle_native,shared,0),H5B2_NAT_NREC(left_native,shared,(new_left_nrec+1)),shared->type->nrec_size*(left_nrec_move-1));
        }

        /* Move record from left node to parent node */
        HDmemcpy(H5B2_INT_NREC(internal,shared,idx-1),H5B2_NAT_NREC(left_native,shared,new_left_nrec),shared->type->nrec_size);

        /* Update # of records in nodes */
        *left_nrec = new_left_nrec;
        *middle_nrec = new_middle_nrec;
        *new_nrec = new_new_nrec;
        *right_nrec = new_right_nrec;
    } /* end block */

    /* Update # of records in parent node */
/* Hmm, this value for 'all_rec' wont' be right for internal nodes... */
    internal->node_ptrs[idx-1].all_nrec = internal->node_ptrs[idx-1].node_nrec = *left_nrec;
    internal->node_ptrs[idx].all_nrec = internal->node_ptrs[idx].node_nrec = *middle_nrec;
    internal->node_ptrs[idx+1].all_nrec = internal->node_ptrs[idx+1].node_nrec = *new_nrec;
    internal->node_ptrs[idx+2].all_nrec = internal->node_ptrs[idx+2].node_nrec = *right_nrec;
    internal->nrec++;

    /* Mark parent as dirty */
    internal->cache_info.is_dirty = TRUE;

    /* Update grandparent info */
    curr_node_ptr->node_nrec++;

    /* Mark grandparent as dirty */
    parent_cache_info->is_dirty = TRUE;

    /* Unlock child nodes */
    if (H5AC_unprotect(f, dxpl_id, child_class, left_addr, left_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")
    if (H5AC_unprotect(f, dxpl_id, child_class, middle_addr, middle_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")
    if (H5AC_unprotect(f, dxpl_id, child_class, new_addr, new_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")
    if (H5AC_unprotect(f, dxpl_id, child_class, right_addr, right_child, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree child node")

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5B2_split3 */


/*-------------------------------------------------------------------------
 * Function:	H5B2_insert
 *
 * Purpose:	Adds a new record to the B-tree.  If the root node of
 *		the B-tree splits then the B-tree header tracks the new
 *              root node created.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  2 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5B2_insert(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type, haddr_t addr,
           void *udata)
{
    H5B2_t	*bt2=NULL;              /* Pointer to the B-tree header */
    H5RC_t      *bt2_shared=NULL;       /* Pointer to ref-counter for shared B-tree info */
    hbool_t     incr_rc=FALSE;          /* Flag to indicate that we've incremented the B-tree's shared info reference count */
    H5B2_shared_t *shared;              /* Pointer to B-tree's shared information */
    H5B2_node_ptr_t leaf_ptr;           /* Node pointer info for leaf node */
    H5B2_leaf_t *leaf=NULL;             /* Pointer to leaf node */
    int         idx;                    /* Location of record which matches key */
    herr_t	ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(H5B2_insert, FAIL)

    /* Check arguments. */
    HDassert(f);
    HDassert(type);
    HDassert(H5F_addr_defined(addr));

    /* Look up the b-tree header */
    if (NULL == (bt2 = H5AC_protect(f, dxpl_id, H5AC_BT2_HDR, addr, type, NULL, H5AC_WRITE)))
	HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree header")

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(bt2->shared);
    HDassert(shared);

    /* Safely grab pointer to reference counted shared B-tree info, so we can release the B-tree header if necessary */
    bt2_shared=bt2->shared;
    H5RC_INC(bt2_shared);
    incr_rc=TRUE;

    /* Check if the root node is allocated yet */
    if(!H5F_addr_defined(bt2->root.addr)) {
        /* Create root node as leaf node in B-tree */
        if(H5B2_create_leaf(f, dxpl_id, bt2_shared, &(bt2->root))<0)
	    HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "unable to create root node")

        /* Mark B-tree header as dirty, since we updated the address of the root node */
        bt2->cache_info.is_dirty = TRUE;
    } /* end if */
    /* Check if we need to split the root node */
    else if((bt2->depth==0 && bt2->root.node_nrec==shared->split_leaf_nrec) ||
            (bt2->depth>0 && bt2->root.node_nrec==shared->split_int_nrec)) {
        /* Split root node */
        if(H5B2_split_root(f, dxpl_id, bt2, bt2_shared)<0)
            HGOTO_ERROR(H5E_BTREE, H5E_CANTSPLIT, FAIL, "unable to split root node")
    } /* end if */
        
    /* Check for non-trivial B-tree */
    if(bt2->depth>0) {
        H5B2_internal_t *internal;          /* Pointer to internal node in B-tree */
        H5AC_info_t *parent_cache_info;     /* Parent node's cache info */
        haddr_t     parent_addr;            /* Address of parent which contain's node pointer to current node */
        void        *parent_ptr;            /* Pointer to parent structure in memory */
        H5AC_info_t *curr_cache_info=NULL;  /* Current node's cache info */
        H5B2_node_ptr_t *curr_node_ptr;     /* Pointer to node pointer info for current node (in parent node) */
        haddr_t curr_addr=HADDR_UNDEF;      /* Address of current node */
        void        *curr_ptr=NULL;         /* Pointer to current structure in memory */
        H5B2_node_ptr_t *child_node_ptr=NULL;   /* Pointer to node pointer info for child node */
        unsigned    depth;                  /* Depth of current node */

        /* Track the depth of current node (leaves are depth 0) */
        depth=bt2->depth;

        /* Set initial "parent" information to the B-tree header */
        parent_cache_info=&(bt2->cache_info);
        parent_addr=addr;
        parent_ptr=bt2;

        /* Set initial node pointer for "current" node */
        curr_node_ptr=&(bt2->root);

        /* Find correct leaf to insert node into */
        while(depth>0) {
            /* Lock B-tree current node */
            if (NULL == (internal = H5AC_protect(f, dxpl_id, H5AC_BT2_INT, curr_node_ptr->addr, &(curr_node_ptr->node_nrec), bt2_shared, H5AC_WRITE)))
                HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")

            /* Set information for current (root) node */
            curr_cache_info=&(internal->cache_info);
            curr_addr=curr_node_ptr->addr;
            curr_ptr=internal;

            /* Locate node pointer for child */
            if((idx=H5B2_locate_record(f,dxpl_id,shared->type,internal->nrec,shared->nat_off,internal->int_native,udata))<0)
                HGOTO_ERROR(H5E_BTREE, H5E_EXISTS, FAIL, "record is already in B-tree")

            /* Get node pointer for child */
            child_node_ptr=&(internal->node_ptrs[idx]);

            /* Preemptively split/redistribute a node we will enter */
            if((depth==1 && child_node_ptr->node_nrec==shared->split_leaf_nrec) ||
                    (depth>1 && child_node_ptr->node_nrec==shared->split_int_nrec)) {
                /* Attempt to redistribute records among children */
                if(idx==0) {    /* Left-most child */
                    if((depth==1 && internal->node_ptrs[idx+1].node_nrec<shared->split_leaf_nrec) ||
                            (depth>1 && internal->node_ptrs[idx+1].node_nrec<shared->split_int_nrec)) {
                        if(H5B2_redistribute2(f,dxpl_id,depth,internal,(unsigned)idx)<0)
                            HGOTO_ERROR(H5E_BTREE, H5E_CANTREDISTRIBUTE, FAIL, "unable to redistribute child node records")
                    } /* end if */
                    else {
                        if(H5B2_split2(f,dxpl_id,depth,curr_node_ptr,parent_cache_info,internal,(unsigned)idx)<0)
                            HGOTO_ERROR(H5E_BTREE, H5E_CANTSPLIT, FAIL, "unable to split child node")
                    } /* end else */
                } /* end if */
                else if((unsigned)idx==internal->nrec) { /* Right-most child */
                    if((depth==1 && internal->node_ptrs[idx-1].node_nrec<shared->split_leaf_nrec) ||
                            (depth>1 && internal->node_ptrs[idx-1].node_nrec<shared->split_int_nrec)) {
                        if(H5B2_redistribute2(f,dxpl_id,depth,internal,(unsigned)(idx-1))<0)
                            HGOTO_ERROR(H5E_BTREE, H5E_CANTREDISTRIBUTE, FAIL, "unable to redistribute child node records")
                    } /* end if */
                    else {
                        if(H5B2_split2(f,dxpl_id,depth,curr_node_ptr,parent_cache_info,internal,(unsigned)(idx-1))<0)
                            HGOTO_ERROR(H5E_BTREE, H5E_CANTSPLIT, FAIL, "unable to split child node")
                    } /* end else */
                } /* end if */
                else { /* Middle child */
                    if((depth==1 &&
                                ((internal->node_ptrs[idx+1].node_nrec<shared->split_leaf_nrec) ||
                                (internal->node_ptrs[idx-1].node_nrec<shared->split_leaf_nrec))) ||
                            (depth>1 && 
                                ((internal->node_ptrs[idx+1].node_nrec<shared->split_int_nrec) ||
                                (internal->node_ptrs[idx-1].node_nrec<shared->split_int_nrec)))) {
                        if(H5B2_redistribute3(f,dxpl_id,depth,internal,(unsigned)idx)<0)
                            HGOTO_ERROR(H5E_BTREE, H5E_CANTREDISTRIBUTE, FAIL, "unable to redistribute child node records")
                    } /* end if */
                    else {
                        if(H5B2_split3(f,dxpl_id,depth,curr_node_ptr,parent_cache_info,internal,(unsigned)idx)<0)
                            HGOTO_ERROR(H5E_BTREE, H5E_CANTSPLIT, FAIL, "unable to split child node")
                    } /* end else */
                } /* end else */

                /* Locate node pointer for child (after split redistribute) */
/* Actually, this can be easily updated (for 2-node redistrib.) and shouldn't require re-searching */
                if((idx=H5B2_locate_record(f,dxpl_id,shared->type,internal->nrec,shared->nat_off,internal->int_native,udata))<0)
                    HGOTO_ERROR(H5E_BTREE, H5E_EXISTS, FAIL, "record is already in B-tree")

                /* Update child_node_ptr (to reflect change in location from split/redistribution) */
                child_node_ptr=&(internal->node_ptrs[idx]);
            } /* end if */

            /* Update record count (in parent) */
            curr_node_ptr->all_nrec++;

            /* Mark parent node as dirty */
            parent_cache_info->is_dirty = TRUE;

            /* Unlock parent node (possibly the B-tree header) */
            if (H5AC_unprotect(f, dxpl_id, parent_cache_info->type, parent_addr, parent_ptr, H5AC__NO_FLAGS_SET) < 0)
                HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree info")

            /* Transition "current" info into "parent" info */
            parent_cache_info = curr_cache_info;
            parent_addr = curr_addr;
            parent_ptr = curr_ptr;

            /* Transition "child" node pointer to "current" node pointer */
            curr_node_ptr = child_node_ptr;

            /* Decrement depth of current node */
            depth--;
        } /* end while */

        /* Update record count for leaf (in current node) */
        HDassert(curr_node_ptr);
        curr_node_ptr->all_nrec++;
        curr_node_ptr->node_nrec++;

        /* Mark parent node as dirty */
        curr_cache_info->is_dirty = TRUE;

        /* Copy node pointer info for leaf */
        leaf_ptr = *curr_node_ptr;

        /* Release current node */
        if (H5AC_unprotect(f, dxpl_id, curr_cache_info->type, curr_addr, curr_ptr, H5AC__NO_FLAGS_SET) < 0)
            HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree node")
    } /* end if */
    else {
        /* Update record count for root node */
        bt2->root.all_nrec++;
        bt2->root.node_nrec++;

        /* Mark parent node as dirty */
        bt2->cache_info.is_dirty = TRUE;

        /* Copy node pointer info for leaf */
        leaf_ptr = bt2->root;

        /* Release parent node */
        if (H5AC_unprotect(f, dxpl_id, H5AC_BT2_HDR, addr, bt2, H5AC__NO_FLAGS_SET) < 0)
            HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree header info")
        bt2=NULL;
    } /* end else */

    /* Must have a leaf node with enough space to insert a record now */
    HDassert(H5F_addr_defined(leaf_ptr.addr));
    HDassert((leaf_ptr.node_nrec-1)<shared->split_leaf_nrec); /* node pointer to leaf has already been incremented */

    /* Look up the B-tree leaf node */
    if (NULL == (leaf = H5AC_protect(f, dxpl_id, H5AC_BT2_LEAF, leaf_ptr.addr, &(leaf_ptr.node_nrec), bt2_shared, H5AC_WRITE)))
        HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

    /* Sanity check number of records */
    HDassert(leaf_ptr.all_nrec==leaf_ptr.node_nrec);
    HDassert(leaf->nrec==(leaf_ptr.node_nrec-1)); /* node pointer to leaf has already been incremented */

    /* Check for inserting into empty leaf */
    if(leaf->nrec==0)
        idx=0;
    else {
        /* Sanity check for the leaf node being full */
        HDassert(leaf->nrec!=shared->split_leaf_nrec);

        /* Find correct location to insert this record and make room for it */
        if((idx=H5B2_locate_record(f,dxpl_id,shared->type,leaf->nrec,shared->nat_off,leaf->leaf_native,udata))<0) {
            /* Release the B-tree leaf node */
            if (H5AC_unprotect(f, dxpl_id, H5AC_BT2_LEAF, leaf_ptr.addr, leaf, H5AC__NO_FLAGS_SET) < 0)
                HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree leaf node")

            HGOTO_ERROR(H5E_BTREE, H5E_EXISTS, FAIL, "record is already in B-tree")
        } /* end if */

        /* Make room for new record */
        if((unsigned)idx<leaf->nrec)
            HDmemmove(H5B2_LEAF_NREC(leaf,shared,idx+1),H5B2_LEAF_NREC(leaf,shared,idx),shared->type->nrec_size*(leaf->nrec-idx));
    } /* end else */

    /* Make callback to store record in native form */
    if((shared->type->store)(f,dxpl_id,udata,H5B2_LEAF_NREC(leaf,shared,idx))<0) {
        /* Release the B-tree leaf node */
        if (H5AC_unprotect(f, dxpl_id, H5AC_BT2_LEAF, leaf_ptr.addr, leaf, H5AC__NO_FLAGS_SET) < 0)
            HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree leaf node")

        HGOTO_ERROR(H5E_BTREE, H5E_CANTINSERT, FAIL, "unable to insert record into leaf node")
    } /* end if */

    /* Update number of records in node */
    leaf->nrec++;

    /* Mark leaf node as dirty also */
    leaf->cache_info.is_dirty = TRUE;

    /* Release the B-tree leaf node */
    if (H5AC_unprotect(f, dxpl_id, H5AC_BT2_LEAF, leaf_ptr.addr, leaf, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree leaf node")

done:
    /* Check if we need to decrement the reference count for the B-tree's shared info */
    if(incr_rc)
        H5RC_DEC(bt2_shared);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5B2_insert() */


/*-------------------------------------------------------------------------
 * Function:	H5B2_create_leaf
 *
 * Purpose:	Creates empty leaf node of a B-tree and update node pointer
 *              to point to it.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  2 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5B2_create_leaf(H5F_t *f, hid_t dxpl_id, H5RC_t *bt2_shared, H5B2_node_ptr_t *node_ptr)
{
    H5B2_leaf_t *leaf=NULL;     /* Pointer to new leaf node created */
    H5B2_shared_t *shared;      /* Shared B-tree information */
    herr_t	ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(H5B2_create_leaf, FAIL)

    /* Check arguments. */
    HDassert(f);
    HDassert(bt2_shared);
    HDassert(node_ptr);

    /* Allocate memory for leaf information */
    if (NULL==(leaf = H5FL_MALLOC(H5B2_leaf_t)))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree leaf info")

    /* Set metadata cache info */
    HDmemset(&leaf->cache_info,0,sizeof(H5AC_info_t));
    leaf->cache_info.is_dirty = TRUE;

    /* Share common B-tree information */
    leaf->shared = bt2_shared;
    H5RC_INC(leaf->shared);

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(leaf->shared);
    HDassert(shared);

    /* Allocate space for the native keys in memory */
    if((leaf->leaf_native=H5FL_FAC_MALLOC(shared->leaf_fac))==NULL)
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree leaf native keys")
#ifdef H5_USING_PURIFY
HDmemset(leaf->leaf_native,0,shared->type->nrec_size*shared->leaf_nrec);
#endif /* H5_USING_PURIFY */

    /* Set number of records */
    leaf->nrec=0;

    /* Allocate space on disk for the leaf */
    if (HADDR_UNDEF==(node_ptr->addr=H5MF_alloc(f, H5FD_MEM_BTREE, dxpl_id, (hsize_t)shared->node_size)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for B-tree leaf node")

    /* Cache the new B-tree node */
    if (H5AC_set(f, dxpl_id, H5AC_BT2_LEAF, node_ptr->addr, leaf, H5AC__NO_FLAGS_SET) < 0)
	HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "can't add B-tree leaf to cache")

done:
    if (ret_value<0) {
	if (leaf)
            (void)H5B2_cache_leaf_dest(f,leaf);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5B2_create_leaf() */


/*-------------------------------------------------------------------------
 * Function:	H5B2_create_internal
 *
 * Purpose:	Creates empty internal node of a B-tree and update node pointer
 *              to point to it.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb  3 2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5B2_create_internal(H5F_t *f, hid_t dxpl_id, H5RC_t *bt2_shared, H5B2_node_ptr_t *node_ptr)
{
    H5B2_internal_t *internal=NULL;     /* Pointer to new internal node created */
    H5B2_shared_t *shared;              /* Shared B-tree information */
    herr_t	ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(H5B2_create_internal, FAIL)

    /* Check arguments. */
    HDassert(f);
    HDassert(bt2_shared);
    HDassert(node_ptr);

    /* Allocate memory for internal node information */
    if (NULL==(internal = H5FL_MALLOC(H5B2_internal_t)))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree internal info")

    /* Set metadata cache info */
    HDmemset(&internal->cache_info,0,sizeof(H5AC_info_t));
    internal->cache_info.is_dirty = TRUE;

    /* Share common B-tree information */
    internal->shared = bt2_shared;
    H5RC_INC(internal->shared);

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(internal->shared);
    HDassert(shared);

    /* Allocate space for the native keys in memory */
    if((internal->int_native=H5FL_FAC_MALLOC(shared->int_fac))==NULL)
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree internal native keys")
#ifdef H5_USING_PURIFY
HDmemset(internal->int_native,0,shared->type->nrec_size*shared->internal_nrec);
#endif /* H5_USING_PURIFY */

    /* Allocate space for the node pointers in memory */
    if((internal->node_ptrs=H5FL_FAC_MALLOC(shared->node_ptr_fac))==NULL)
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree internal node pointers")
#ifdef H5_USING_PURIFY
HDmemset(internal->node_ptrs,0,sizeof(H5B2_node_ptr_t)*(shared->internal_nrec+1));
#endif /* H5_USING_PURIFY */

    /* Set number of records */
    internal->nrec=0;

    /* Allocate space on disk for the internal node */
    if (HADDR_UNDEF==(node_ptr->addr=H5MF_alloc(f, H5FD_MEM_BTREE, dxpl_id, (hsize_t)shared->node_size)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for B-tree internal node")

    /* Cache the new B-tree node */
    if (H5AC_set(f, dxpl_id, H5AC_BT2_INT, node_ptr->addr, internal, H5AC__NO_FLAGS_SET) < 0)
	HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "can't add B-tree internal node to cache")

done:
    if (ret_value<0) {
	if (internal)
            (void)H5B2_cache_internal_dest(f,internal);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5B2_create_internal() */


/*-------------------------------------------------------------------------
 * Function:	H5B2_iterate_node
 *
 * Purpose:	Iterate over all the records from a B-tree node, in "in-order"
 *		order, making a callback for each record.
 *
 *              If the callback returns non-zero, the iteration breaks out
 *              without finishing all the records.
 *
 * Return:	Value from callback, non-negative on success, negative on error
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb 11 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5B2_iterate_node(H5F_t *f, hid_t dxpl_id, H5RC_t *bt2_shared, unsigned depth,
    const H5B2_node_ptr_t *curr_node, H5B2_operator_t op, void *op_data)
{
    H5B2_shared_t *shared;              /* Pointer to B-tree's shared information */
    const H5AC_class_t *curr_node_class=NULL; /* Pointer to current node's class info */
    void *node=NULL;                    /* Pointers to current node */
    uint8_t *native;                    /* Pointers to node's native records */
    H5B2_node_ptr_t *node_ptrs=NULL;    /* Pointers to node's node pointers */
    unsigned u;                         /* Local index */
    herr_t	ret_value = H5B2_ITER_CONT;

    FUNC_ENTER_NOAPI(H5B2_iterate_node, FAIL)

    /* Check arguments. */
    HDassert(f);
    HDassert(bt2_shared);
    HDassert(curr_node);
    HDassert(op);

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(bt2_shared);
    HDassert(shared);

    if(depth>0) {
        H5B2_internal_t *internal;     /* Pointer to internal node */

        /* Lock the current B-tree node */
        if (NULL == (internal = H5AC_protect(f, dxpl_id, H5AC_BT2_INT, curr_node->addr, &(curr_node->node_nrec), shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree internal node")

        /* Set up information about current node */
        curr_node_class = H5AC_BT2_INT;
        node = internal;
        native = internal->int_native;
        node_ptrs = internal->node_ptrs;
    } /* end if */
    else {
        H5B2_leaf_t *leaf;             /* Pointer to leaf node */

        /* Lock the current B-tree node */
        if (NULL == (leaf = H5AC_protect(f, dxpl_id, H5AC_BT2_LEAF, curr_node->addr, &(curr_node->node_nrec), shared, H5AC_WRITE)))
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree leaf node")

        /* Set up information about current node */
        curr_node_class = H5AC_BT2_LEAF;
        node = leaf;
        native = leaf->leaf_native;
    } /* end else */

    /* Iterate through records */
    for(u=0, ret_value; u<curr_node->node_nrec && !ret_value; u++) {
        /* Descend into child node, if current node is an internal node */
        if(depth>0) {
            if((ret_value = H5B2_iterate_node(f,dxpl_id,bt2_shared,depth-1,&(node_ptrs[u]),op,op_data))<0)
                HGOTO_ERROR(H5E_BTREE, H5E_CANTLIST, FAIL, "node iteration failed")
        } /* end if */

        /* Make callback for current record */
        if ((ret_value = (op)(H5B2_NAT_NREC(native,shared,u), op_data)) <0)
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLIST, FAIL, "iterator function failed")
    } /* end for */

    /* Descend into last child node, if current node is an internal node */
    if(depth>0) {
        if((ret_value = H5B2_iterate_node(f,dxpl_id,bt2_shared,depth-1,&(node_ptrs[u]),op,op_data))<0)
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLIST, FAIL, "node iteration failed")
    } /* end if */

done:
    /* Unlock current node */
    if(node)
        if (H5AC_unprotect(f, dxpl_id, curr_node_class, curr_node->addr, node, H5AC__NO_FLAGS_SET) < 0)
            HDONE_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree node")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5B2_iterate_node() */


/*-------------------------------------------------------------------------
 * Function:	H5B2_iterate
 *
 * Purpose:	Iterate over all the records in the B-tree, in "in-order"
 *		order, making a callback for each record.
 *
 *              If the callback returns non-zero, the iteration breaks out
 *              without finishing all the records.
 *
 * Return:	Value from callback, non-negative on success, negative on error
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Feb 11 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5B2_iterate(H5F_t *f, hid_t dxpl_id, const H5B2_class_t *type, haddr_t addr,
    H5B2_operator_t op, void *op_data)
{
    H5B2_t	*bt2=NULL;              /* Pointer to the B-tree header */
    H5RC_t      *bt2_shared=NULL;       /* Pointer to ref-counter for shared B-tree info */
    hbool_t     incr_rc=FALSE;          /* Flag to indicate that we've incremented the B-tree's shared info reference count */
    H5B2_shared_t *shared;              /* Pointer to B-tree's shared information */
    H5B2_node_ptr_t root_ptr;           /* Node pointer info for root node */
    unsigned    depth;                  /* Current depth of the tree */
    herr_t	ret_value = SUCCEED;

    FUNC_ENTER_NOAPI(H5B2_iterate, FAIL)

    /* Check arguments. */
    HDassert(f);
    HDassert(type);
    HDassert(H5F_addr_defined(addr));
    HDassert(op);

    /* Look up the B-tree header */
    if (NULL == (bt2 = H5AC_protect(f, dxpl_id, H5AC_BT2_HDR, addr, type, NULL, H5AC_WRITE)))
	HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL, "unable to load B-tree header")

    /* Get the pointer to the shared B-tree info */
    shared=H5RC_GET_OBJ(bt2->shared);
    HDassert(shared);

    /* Safely grab pointer to reference counted shared B-tree info, so we can release the B-tree header if necessary */
    bt2_shared=bt2->shared;
    H5RC_INC(bt2_shared);
    incr_rc=TRUE;

    /* Make copy of the root node pointer */
    root_ptr = bt2->root;

    /* Current depth of the tree */
    depth=bt2->depth;

    /* Release header */
    if (H5AC_unprotect(f, dxpl_id, H5AC_BT2_HDR, addr, bt2, H5AC__NO_FLAGS_SET) < 0)
        HGOTO_ERROR(H5E_BTREE, H5E_PROTECT, FAIL, "unable to release B-tree header info")
    bt2=NULL;

    /* Iterate through records */
    if(root_ptr.node_nrec>0) {
        /* Iterate through nodes */
        if((ret_value=H5B2_iterate_node(f,dxpl_id,bt2_shared,depth,&root_ptr,op,op_data))<0)
            HGOTO_ERROR(H5E_BTREE, H5E_CANTLIST, FAIL, "node iteration failed")
    } /* end if */

done:
    /* Check if we need to decrement the reference count for the B-tree's shared info */
    if(incr_rc)
        H5RC_DEC(bt2_shared);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5B2_iterate() */