1 files changed, 66 insertions, 0 deletions
diff --git a/fs/bcachefs/enumerated_ref.h b/fs/bcachefs/enumerated_ref.h
new file mode 100644
index 000000000000..ec01cf59ef80
--- /dev/null
+++ b/fs/bcachefs/enumerated_ref.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_ENUMERATED_REF_H
+#define _BCACHEFS_ENUMERATED_REF_H
+
+#include "enumerated_ref_types.h"
+
+/*
+ * A refcount where the users are enumerated: in debug mode, we create sepate
+ * refcounts for each user, to make leaks and refcount errors easy to track
+ * down:
+ */
+
+#ifdef ENUMERATED_REF_DEBUG
+void enumerated_ref_get(struct enumerated_ref *, unsigned);
+bool __enumerated_ref_tryget(struct enumerated_ref *, unsigned);
+bool enumerated_ref_tryget(struct enumerated_ref *, unsigned);
+void enumerated_ref_put(struct enumerated_ref *, unsigned);
+#else
+
+static inline void enumerated_ref_get(struct enumerated_ref *ref, unsigned idx)
+{
+	percpu_ref_get(&ref->ref);
+}
+
+static inline bool __enumerated_ref_tryget(struct enumerated_ref *ref, unsigned idx)
+{
+	return percpu_ref_tryget(&ref->ref);
+}
+
+static inline bool enumerated_ref_tryget(struct enumerated_ref *ref, unsigned idx)
+{
+	return percpu_ref_tryget_live(&ref->ref);
+}
+
+static inline void enumerated_ref_put(struct enumerated_ref *ref, unsigned idx)
+{
+	percpu_ref_put(&ref->ref);
+}
+#endif
+
+static inline bool enumerated_ref_is_zero(struct enumerated_ref *ref)
+{
+#ifndef ENUMERATED_REF_DEBUG
+	return percpu_ref_is_zero(&ref->ref);
+#else
+	for (unsigned i = 0; i < ref->nr; i++)
+		if (atomic_long_read(&ref->refs[i]))
+			return false;
+	return true;
+#endif
+}
+
+void enumerated_ref_stop_async(struct enumerated_ref *);
+void enumerated_ref_stop(struct enumerated_ref *, const char * const[]);
+void enumerated_ref_start(struct enumerated_ref *);
+
+void enumerated_ref_exit(struct enumerated_ref *);
+int enumerated_ref_init(struct enumerated_ref *, unsigned,
+			void (*stop_fn)(struct enumerated_ref *));
+
+struct printbuf;
+void enumerated_ref_to_text(struct printbuf *,
+			    struct enumerated_ref *,
+			    const char * const[]);
+
+#endif /* _BCACHEFS_ENUMERATED_REF_H */