mirror of
https://git.proxmox.com/git/mirror_zfs
synced 2025-11-04 01:41:27 +00:00
1d3ba0bf01
The commit replaces all findings of the link: http://www.opensolaris.org/os/licensing with this one: https://opensource.org/licenses/CDDL-1.0 Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tino Reichardt <milky-zfs@mcmilk.de> Closes #13619
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/*
|
|
* 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 https://opensource.org/licenses/CDDL-1.0.
|
|
* 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.
|
|
*/
|
|
|
|
|
|
|
|
#include <sys/zfs_context.h>
|
|
#include <sys/avl.h>
|
|
#include <sys/unique.h>
|
|
|
|
static avl_tree_t unique_avl;
|
|
static kmutex_t unique_mtx;
|
|
|
|
typedef struct unique {
|
|
avl_node_t un_link;
|
|
uint64_t un_value;
|
|
} unique_t;
|
|
|
|
#define UNIQUE_MASK ((1ULL << UNIQUE_BITS) - 1)
|
|
|
|
static int
|
|
unique_compare(const void *a, const void *b)
|
|
{
|
|
const unique_t *una = (const unique_t *)a;
|
|
const unique_t *unb = (const unique_t *)b;
|
|
|
|
return (TREE_CMP(una->un_value, unb->un_value));
|
|
}
|
|
|
|
void
|
|
unique_init(void)
|
|
{
|
|
avl_create(&unique_avl, unique_compare,
|
|
sizeof (unique_t), offsetof(unique_t, un_link));
|
|
mutex_init(&unique_mtx, NULL, MUTEX_DEFAULT, NULL);
|
|
}
|
|
|
|
void
|
|
unique_fini(void)
|
|
{
|
|
avl_destroy(&unique_avl);
|
|
mutex_destroy(&unique_mtx);
|
|
}
|
|
|
|
uint64_t
|
|
unique_create(void)
|
|
{
|
|
uint64_t value = unique_insert(0);
|
|
unique_remove(value);
|
|
return (value);
|
|
}
|
|
|
|
uint64_t
|
|
unique_insert(uint64_t value)
|
|
{
|
|
avl_index_t idx;
|
|
unique_t *un = kmem_alloc(sizeof (unique_t), KM_SLEEP);
|
|
|
|
un->un_value = value;
|
|
|
|
mutex_enter(&unique_mtx);
|
|
while (un->un_value == 0 || un->un_value & ~UNIQUE_MASK ||
|
|
avl_find(&unique_avl, un, &idx)) {
|
|
mutex_exit(&unique_mtx);
|
|
(void) random_get_pseudo_bytes((void*)&un->un_value,
|
|
sizeof (un->un_value));
|
|
un->un_value &= UNIQUE_MASK;
|
|
mutex_enter(&unique_mtx);
|
|
}
|
|
|
|
avl_insert(&unique_avl, un, idx);
|
|
mutex_exit(&unique_mtx);
|
|
|
|
return (un->un_value);
|
|
}
|
|
|
|
void
|
|
unique_remove(uint64_t value)
|
|
{
|
|
unique_t un_tofind;
|
|
unique_t *un;
|
|
|
|
un_tofind.un_value = value;
|
|
mutex_enter(&unique_mtx);
|
|
un = avl_find(&unique_avl, &un_tofind, NULL);
|
|
if (un != NULL) {
|
|
avl_remove(&unique_avl, un);
|
|
kmem_free(un, sizeof (unique_t));
|
|
}
|
|
mutex_exit(&unique_mtx);
|
|
}
|