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-rw-r--r--sys/compat/linuxkpi/common/include/linux/rwsem.h59
1 files changed, 59 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/rwsem.h b/sys/compat/linuxkpi/common/include/linux/rwsem.h
new file mode 100644
index 000000000000..22ad4dc62a94
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/rwsem.h
@@ -0,0 +1,59 @@
+/*-
+ * Copyright (c) 2010 Isilon Systems, Inc.
+ * Copyright (c) 2010 iX Systems, Inc.
+ * Copyright (c) 2010 Panasas, Inc.
+ * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
+ * 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_RWSEM_H_
+#define _LINUX_RWSEM_H_
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/sx.h>
+
+struct rw_semaphore {
+ struct sx sx;
+};
+
+#define down_write(_rw) sx_xlock(&(_rw)->sx)
+#define up_write(_rw) sx_xunlock(&(_rw)->sx)
+#define down_read(_rw) sx_slock(&(_rw)->sx)
+#define up_read(_rw) sx_sunlock(&(_rw)->sx)
+#define down_read_trylock(_rw) !!sx_try_slock(&(_rw)->sx)
+#define down_write_trylock(_rw) !!sx_try_xlock(&(_rw)->sx)
+#define downgrade_write(_rw) sx_downgrade(&(_rw)->sx)
+#define down_read_nested(_rw, _sc) down_read(_rw)
+
+static inline void
+init_rwsem(struct rw_semaphore *rw)
+{
+
+ memset(&rw->sx, 0, sizeof(rw->sx));
+ sx_init_flags(&rw->sx, "lnxrwsem", SX_NOWITNESS);
+}
+
+#endif /* _LINUX_RWSEM_H_ */