1 files changed, 24 insertions, 0 deletions

diff --git a/kernel/include/linux/fs_pin.h b/kernel/include/linux/fs_pin.h
new file mode 100644
index 000000000..3886b3bff
--- /dev/null
+++ b/kernel/include/linux/fs_pin.h
@@ -0,0 +1,24 @@
+#include <linux/wait.h>
+
+struct fs_pin {
+	wait_queue_head_t	wait;
+	int			done;
+	struct hlist_node	s_list;
+	struct hlist_node	m_list;
+	void (*kill)(struct fs_pin *);
+};
+
+struct vfsmount;
+
+static inline void init_fs_pin(struct fs_pin *p, void (*kill)(struct fs_pin *))
+{
+	init_waitqueue_head(&p->wait);
+	INIT_HLIST_NODE(&p->s_list);
+	INIT_HLIST_NODE(&p->m_list);
+	p->kill = kill;
+}
+
+void pin_remove(struct fs_pin *);
+void pin_insert_group(struct fs_pin *, struct vfsmount *, struct hlist_head *);
+void pin_insert(struct fs_pin *, struct vfsmount *);
+void pin_kill(struct fs_pin *);