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/usr/include/libzfs/sys/bptree.h is in libzfslinux-dev 0.7.5-1ubuntu15.

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/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
 */

#ifndef	_SYS_BPTREE_H
#define	_SYS_BPTREE_H

#include <sys/spa.h>
#include <sys/zio.h>

#ifdef	__cplusplus
extern "C" {
#endif

typedef struct bptree_phys {
	uint64_t bt_begin;
	uint64_t bt_end;
	uint64_t bt_bytes;
	uint64_t bt_comp;
	uint64_t bt_uncomp;
} bptree_phys_t;

typedef struct bptree_entry_phys {
	blkptr_t be_bp;
	uint64_t be_birth_txg; /* only delete blocks born after this txg */
	zbookmark_phys_t be_zb; /* holds traversal resume point if needed */
} bptree_entry_phys_t;

typedef int bptree_itor_t(void *arg, const blkptr_t *bp, dmu_tx_t *tx);

uint64_t bptree_alloc(objset_t *os, dmu_tx_t *tx);
int bptree_free(objset_t *os, uint64_t obj, dmu_tx_t *tx);
boolean_t bptree_is_empty(objset_t *os, uint64_t obj);

void bptree_add(objset_t *os, uint64_t obj, blkptr_t *bp, uint64_t birth_txg,
    uint64_t bytes, uint64_t comp, uint64_t uncomp, dmu_tx_t *tx);

int bptree_iterate(objset_t *os, uint64_t obj, boolean_t free,
    bptree_itor_t func, void *arg, dmu_tx_t *tx);

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_BPTREE_H */