/usr/include/libspl/zone.h is in libzfslinux-dev 0.6.5.6-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | /*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
#ifndef _LIBSPL_ZONE_H
#define	_LIBSPL_ZONE_H
#include <sys/types.h>
#include <sys/zone.h>
#include <sys/priv.h>
#ifdef	__cplusplus
extern "C" {
#endif
#define	GLOBAL_ZONEID		0
#define	GLOBAL_ZONEID_NAME	"global"
/*
 * Functions for mapping between id and name for active zones.
 */
extern zoneid_t		getzoneid(void);
extern zoneid_t		getzoneidbyname(const char *);
extern ssize_t		getzonenamebyid(zoneid_t, char *, size_t);
#ifdef	__cplusplus
}
#endif
#endif /* _LIBSPL_ZONE_H */
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