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, 35 insertions, 0 deletions

diff --git a/c_src/include/linux/shrinker.h b/c_src/include/linux/shrinker.h
new file mode 100644
index 00000000..d0a84794
--- /dev/null
+++ b/c_src/include/linux/shrinker.h
@@ -0,0 +1,35 @@
+#ifndef __TOOLS_LINUX_SHRINKER_H
+#define __TOOLS_LINUX_SHRINKER_H
+
+#include <linux/list.h>
+#include <linux/types.h>
+
+struct shrink_control {
+	gfp_t gfp_mask;
+	unsigned long nr_to_scan;
+};
+
+#define SHRINK_STOP (~0UL)
+
+struct seq_buf;
+struct shrinker {
+	unsigned long (*count_objects)(struct shrinker *,
+				       struct shrink_control *sc);
+	unsigned long (*scan_objects)(struct shrinker *,
+				      struct shrink_control *sc);
+	void (*to_text)(struct seq_buf *, struct shrinker *);
+
+	int seeks;	/* seeks to recreate an obj */
+	long batch;	/* reclaim batch size, 0 = default */
+	struct list_head list;
+	void	*private_data;
+};
+
+void shrinker_free(struct shrinker *);
+struct shrinker *shrinker_alloc(unsigned int, const char *, ...);
+
+int shrinker_register(struct shrinker *);
+
+void run_shrinkers(gfp_t gfp_mask, bool);
+
+#endif /* __TOOLS_LINUX_SHRINKER_H */