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, 40 insertions, 0 deletions

diff --git a/c_src/include/linux/device.h b/c_src/include/linux/device.h
new file mode 100644
index 00000000..2b2b8494
--- /dev/null
+++ b/c_src/include/linux/device.h
@@ -0,0 +1,40 @@
+#ifndef _DEVICE_H_
+#define _DEVICE_H_
+
+#include <linux/slab.h>
+#include <linux/types.h>
+
+struct module;
+
+struct class {
+};
+
+static inline void class_destroy(struct class *class)
+{
+	kfree(class);
+}
+
+static inline struct class * __must_check class_create(struct module *owner,
+						       const char *name)
+{
+	return kzalloc(sizeof(struct class), GFP_KERNEL);
+}
+
+struct device {
+};
+
+static inline void device_unregister(struct device *dev)
+{
+	kfree(dev);
+}
+
+static inline void device_destroy(struct class *cls, dev_t devt) {}
+
+static inline struct device *device_create(struct class *cls, struct device *parent,
+			     dev_t devt, void *drvdata,
+			     const char *fmt, ...)
+{
+	return kzalloc(sizeof(struct device), GFP_KERNEL);
+}
+
+#endif /* _DEVICE_H_ */