1 files changed, 65 insertions, 0 deletions
diff --git a/sys/gnu/fs/xfs/FreeBSD/support/mrlock.h b/sys/gnu/fs/xfs/FreeBSD/support/mrlock.h
new file mode 100644
index 0000000..4e82d41
--- /dev/null
+++ b/sys/gnu/fs/xfs/FreeBSD/support/mrlock.h
@@ -0,0 +1,65 @@
+#ifndef __XFS_SUPPORT_MRLOCK_H__
+#define __XFS_SUPPORT_MRLOCK_H__
+
+#include <sys/types.h>
+#include <sys/systm.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/sx.h>
+
+#include <support/debug.h>
+
+/*
+ * Implement mrlocks on FreeBSD that work for XFS.
+ * Use FreeBSD sx lock and add necessary functions
+ * if additional functionality is requested
+ */
+typedef struct sx mrlock_t;
+
+#define MR_ACCESS	1
+#define MR_UPDATE	2
+
+/* 
+ * Compatibility defines, not really used
+ */
+#define MRLOCK_BARRIER		0x1
+#define MRLOCK_ALLOW_EQUAL_PRI	0x8
+
+/*
+ * mraccessf/mrupdatef take flags to be passed in while sleeping;
+ * only PLTWAIT is currently supported.
+ */
+#define mrinit(lock, name)	sx_init(lock, name)
+#define mrlock_init(lock, type, name, seq) sx_init(lock, name)
+#define mrfree(lock)		_sx_xfs_destroy(lock)
+#define	mraccessf(lock, f)	sx_slock(lock)
+#define	mrupdatef(lock, f)	sx_xlock(lock)
+#define mraccunlock(lock)	sx_sunlock(lock)
+#define mrtryaccess(lock)	sx_try_slock(lock)
+#define mrtryupdate(lock)	sx_try_xlock(lock)
+#define mraccess(mrp)		mraccessf(mrp, 0)
+#define mrupdate(mrp)		mrupdatef(mrp, 0)
+#define mrislocked_access(lock)	_sx_xfs_xowned(lock)
+#define mrislocked_update(lock)	_sx_xfs_sowned(lock)
+#define mrtrypromote(lock)	sx_try_upgrade(lock)
+#define mrdemote(lock)		sx_downgrade(lock)
+
+int	ismrlocked(mrlock_t *, int);
+void	_sx_xfs_lock(struct sx *sx, int type, const char *file, int line);
+void	_sx_xfs_unlock(struct sx *sx, const char *file, int line);
+void	_sx_xfs_destroy(struct sx *sx);
+#define _sx_xfs_xowned(lock) ((lock)->sx_cnt < 0)
+#define _sx_xfs_sowned(lock) ((lock)->sx_cnt > 0)
+
+/*
+ * Functions, not implemented in FreeBSD 
+ */
+#define mrunlock(lock) \
+        _sx_xfs_unlock(lock, __FILE__, __LINE__)
+
+#define	mrlock(lock, type, flags) \
+        _sx_xfs_lock(lock, type, __FILE__, __LINE__)
+
+
+
+#endif /* __XFS_SUPPORT_MRLOCK_H__ */