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, 24 insertions, 0 deletions

diff --git a/c_src/libbcachefs/darray.c b/c_src/libbcachefs/darray.c
new file mode 100644
index 00000000..ac35b8b7
--- /dev/null
+++ b/c_src/libbcachefs/darray.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/log2.h>
+#include <linux/slab.h>
+#include "darray.h"
+
+int __bch2_darray_resize(darray_char *d, size_t element_size, size_t new_size, gfp_t gfp)
+{
+	if (new_size > d->size) {
+		new_size = roundup_pow_of_two(new_size);
+
+		void *data = kvmalloc_array(new_size, element_size, gfp);
+		if (!data)
+			return -ENOMEM;
+
+		memcpy(data, d->data, d->size * element_size);
+		if (d->data != d->preallocated)
+			kvfree(d->data);
+		d->data	= data;
+		d->size = new_size;
+	}
+
+	return 0;
+}