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

Contributed by:		XFS for FreeBSD project

1 files changed, 21 insertions, 0 deletions

diff --git a/sys/gnu/fs/xfs/FreeBSD/support/rwsem.h b/sys/gnu/fs/xfs/FreeBSD/support/rwsem.h
new file mode 100644
index 0000000..bb97232
--- /dev/null
+++ b/sys/gnu/fs/xfs/FreeBSD/support/rwsem.h
@@ -0,0 +1,21 @@
+#ifndef __XFS_SUPPORT_RWSEM_H__
+#define __XFS_SUPPORT_RWSEM_H__
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/sx.h>
+
+#define rw_semaphore	sx
+
+#define	init_rwsem(sem)		sx_init(sem, "rwsem")
+#define	free_rwsem(sem)		sx_destroy(sem)
+#define	down_read(sem)		sx_slock(sem)
+#define	down_read_trylock(sem)	sx_try_slock(sem)
+#define	down_write(sem)		sx_xlock(sem)
+#define	down_write_trylock(sem)	sx_try_xlock(sem)
+#define	up_read(sem)		sx_sunlock(sem)
+#define	up_write(sem)		sx_xunlock(sem)
+#define	downgrade_write(sem)	sx_downgrade(sem)
+
+#endif /* __XFS_SUPPORT_RWSEM_H__ */