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kref.h (290335) kref.h (300497)
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
6 * Copyright (c) 2013 Fran��ois Tigeot
7 * All rights reserved.
8 *

--- 13 unchanged lines hidden (view full) ---

22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
6 * Copyright (c) 2013 Fran��ois Tigeot
7 * All rights reserved.
8 *

--- 13 unchanged lines hidden (view full) ---

22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/kref.h 290335 2015-11-03 12:37:55Z hselasky $
30 * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/kref.h 300497 2016-05-23 12:06:34Z hselasky $
31 */
32#ifndef _LINUX_KREF_H_
33#define _LINUX_KREF_H_
34
35#include <sys/types.h>
36#include <sys/refcount.h>
37
38#include <linux/compiler.h>
31 */
32#ifndef _LINUX_KREF_H_
33#define _LINUX_KREF_H_
34
35#include <sys/types.h>
36#include <sys/refcount.h>
37
38#include <linux/compiler.h>
39#include <linux/kernel.h>
40#include <linux/mutex.h>
41
39#include <asm/atomic.h>
40
41struct kref {
42 atomic_t refcount;
43};
44
45static inline void
46kref_init(struct kref *kref)

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83
84static inline int __must_check
85kref_get_unless_zero(struct kref *kref)
86{
87
88 return atomic_add_unless(&kref->refcount, 1, 0);
89}
90
42#include <asm/atomic.h>
43
44struct kref {
45 atomic_t refcount;
46};
47
48static inline void
49kref_init(struct kref *kref)

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86
87static inline int __must_check
88kref_get_unless_zero(struct kref *kref)
89{
90
91 return atomic_add_unless(&kref->refcount, 1, 0);
92}
93
94static inline int kref_put_mutex(struct kref *kref,
95 void (*release)(struct kref *kref), struct mutex *lock)
96{
97 WARN_ON(release == NULL);
98 if (unlikely(!atomic_add_unless(&kref->refcount, -1, 1))) {
99 mutex_lock(lock);
100 if (unlikely(!atomic_dec_and_test(&kref->refcount))) {
101 mutex_unlock(lock);
102 return 0;
103 }
104 release(kref);
105 return 1;
106 }
107 return 0;
108}
109
91#endif /* _LINUX_KREF_H_ */
110#endif /* _LINUX_KREF_H_ */