Initial import of read-only support for SGI's XFS filesystem.

Contributed by:		XFS for FreeBSD project

1 files changed, 29 insertions, 0 deletions

diff --git a/sys/gnu/fs/xfs/FreeBSD/support/mutex.h b/sys/gnu/fs/xfs/FreeBSD/support/mutex.h
new file mode 100644
index 0000000..d9b89b3
--- /dev/null
+++ b/sys/gnu/fs/xfs/FreeBSD/support/mutex.h
@@ -0,0 +1,29 @@
+#ifndef __XFS_SUPPORT_MUTEX_H__
+#define __XFS_SUPPORT_MUTEX_H__
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/sx.h>
+
+/*
+ * Map the mutex'es from IRIX to FreeBSD. Irix holds mutexes across
+ * sleeps, so on FreeBSD we have a choice of sema, sx or lockmgr
+ * to use as a underlining implemenation. Go with sx always locked
+ * in exclusive mode for now as it gets all the benefits of witness
+ * checking.
+ */
+typedef struct sx mutex_t;
+
+#define mutex_init(lock, type, name)	sx_init(lock, name)
+#define mutex_lock(lock, num)		sx_xlock(lock)
+#define mutex_trylock(lock)	        sx_try_xlock(lock)
+#define mutex_unlock(lock)		sx_xunlock(lock)
+#define mutex_destroy(lock)		sx_destroy(lock)
+
+/*
+ * Type for mutex_init()
+ */
+#define MUTEX_DEFAULT		0
+
+#endif /* __XFS_SUPPORT_MUTEX_H__ */