FreeBSD: Fix ZFS so that snapshots under .zfs/snapshot are NFS visible
[zfs.git] / include / sys / unique.h
blobbc79446575217b275a89ab7205c5b2271c8ccef7
1 /*
2 * CDDL HEADER START
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
19 * CDDL HEADER END
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #ifndef _SYS_UNIQUE_H
27 #define _SYS_UNIQUE_H
29 #include <sys/zfs_context.h>
31 #ifdef __cplusplus
32 extern "C" {
33 #endif
35 /* The number of significant bits in each unique value. */
36 #define UNIQUE_BITS 56
38 void unique_init(void);
39 void unique_fini(void);
42 * Return a new unique value (which will not be uniquified against until
43 * it is unique_insert()-ed).
45 uint64_t unique_create(void);
47 /* Return a unique value, which equals the one passed in if possible. */
48 uint64_t unique_insert(uint64_t value);
50 /* Indicate that this value no longer needs to be uniquified against. */
51 void unique_remove(uint64_t value);
53 #ifdef __cplusplus
55 #endif
57 #endif /* _SYS_UNIQUE_H */