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, 21 insertions, 0 deletions

diff --git a/c_src/include/linux/seq_file.h b/c_src/include/linux/seq_file.h
new file mode 100644
index 00000000..b455ebca
--- /dev/null
+++ b/c_src/include/linux/seq_file.h
@@ -0,0 +1,21 @@
+#ifndef _LINUX_SEQ_FILE_H
+#define _LINUX_SEQ_FILE_H
+
+#include <linux/types.h>
+#include <linux/fs.h>
+
+struct seq_file {
+	char *buf;
+	size_t size;
+	size_t from;
+	size_t count;
+	size_t pad_until;
+	loff_t index;
+	loff_t read_pos;
+	u64 version;
+	int poll_event;
+	const struct file *file;
+	void *private;
+};
+
+#endif