move Rust sources to top level, C sources into c_src

This moves the Rust sources out of rust_src/ and into the top level.
Running the bcachefs executable out of the development tree is now:

$ ./target/release/bcachefs command
or
$ cargo run --profile release -- command

instead of "./bcachefs command".

Building and installing is still:

$ make && make install

Signed-off-by: Thomas Bertschinger <tahbertschinger@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 42 insertions, 0 deletions

diff --git a/c_src/include/linux/completion.h b/c_src/include/linux/completion.h
new file mode 100644
index 00000000..d11a8dd0
--- /dev/null
+++ b/c_src/include/linux/completion.h
@@ -0,0 +1,42 @@
+#ifndef __LINUX_COMPLETION_H
+#define __LINUX_COMPLETION_H
+
+/*
+ * (C) Copyright 2001 Linus Torvalds
+ *
+ * Atomic wait-for-completion handler data structures.
+ * See kernel/sched/completion.c for details.
+ */
+
+#include <linux/wait.h>
+
+struct completion {
+	unsigned int done;
+	wait_queue_head_t wait;
+};
+
+#define DECLARE_COMPLETION(work)					\
+	struct completion work = {					\
+		.done = 0,						\
+		.wait = __WAIT_QUEUE_HEAD_INITIALIZER((work).wait)	\
+	}
+
+#define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
+
+static inline void init_completion(struct completion *x)
+{
+	x->done = 0;
+	init_waitqueue_head(&x->wait);
+}
+
+static inline void reinit_completion(struct completion *x)
+{
+	x->done = 0;
+}
+
+void complete(struct completion *);
+void wait_for_completion(struct completion *);
+
+#define wait_for_completion_interruptible(x) (wait_for_completion(x), 0)
+
+#endif