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-rw-r--r--sys/compat/linuxkpi/common/include/linux/kref.h90
1 files changed, 90 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/kref.h b/sys/compat/linuxkpi/common/include/linux/kref.h
new file mode 100644
index 000000000000..de5ddaa4b886
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/kref.h
@@ -0,0 +1,90 @@
+/*-
+ * Copyright (c) 2010 Isilon Systems, Inc.
+ * Copyright (c) 2010 iX Systems, Inc.
+ * Copyright (c) 2010 Panasas, Inc.
+ * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
+ * Copyright (c) 2013 Fran├žois Tigeot
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice unmodified, this list of conditions, and the following
+ * disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#ifndef _LINUX_KREF_H_
+#define _LINUX_KREF_H_
+
+#include <sys/types.h>
+#include <sys/refcount.h>
+
+#include <asm/atomic.h>
+
+struct kref {
+ atomic_t refcount;
+};
+
+static inline void
+kref_init(struct kref *kref)
+{
+
+ refcount_init(&kref->refcount.counter, 1);
+}
+
+static inline void
+kref_get(struct kref *kref)
+{
+
+ refcount_acquire(&kref->refcount.counter);
+}
+
+static inline int
+kref_put(struct kref *kref, void (*rel)(struct kref *kref))
+{
+
+ if (refcount_release(&kref->refcount.counter)) {
+ rel(kref);
+ return 1;
+ }
+ return 0;
+}
+
+static inline int
+kref_sub(struct kref *kref, unsigned int count,
+ void (*rel)(struct kref *kref))
+{
+
+ while (count--) {
+ if (refcount_release(&kref->refcount.counter)) {
+ rel(kref);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static inline int __must_check
+kref_get_unless_zero(struct kref *kref)
+{
+
+ return atomic_add_unless(&kref->refcount, 1, 0);
+}
+
+#endif /* _LINUX_KREF_H_ */