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

Contributed by:		XFS for FreeBSD project

1 files changed, 22 insertions, 0 deletions

diff --git a/sys/gnu/fs/xfs/FreeBSD/support/rwlock.h b/sys/gnu/fs/xfs/FreeBSD/support/rwlock.h
new file mode 100644
index 0000000..05f489e
--- /dev/null
+++ b/sys/gnu/fs/xfs/FreeBSD/support/rwlock.h
@@ -0,0 +1,22 @@
+#ifndef __XFS_SUPPORT_RWLOCK_H__
+#define __XFS_SUPPORT_RWLOCK_H__
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/sx.h>
+
+typedef	struct sx rwlock_t;
+typedef int    wait_queue_head_t;
+
+#define	rwlock_init(lock)	sx_init(lock, "rwlock")
+#define	rwlock_destroy(lock)	sx_destroy(lock)
+#define	read_lock(lock)		sx_slock(lock)
+#define	read_unlock(lock)	sx_sunlock(lock)
+#define	write_lock(lock)	sx_xlock(lock)
+#define	write_unlock(lock)	sx_xunlock(lock)
+#define	rwlock_trypromote(lock)	sx_try_upgrade(lock)
+#define	rwlock_demote(lock)	sx_downgrade(lock)
+
+
+#endif /* __XFS_SUPPORT_RWLOCK_H__ */