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, 46 insertions, 0 deletions

diff --git a/c_src/ccan/array_size/_info b/c_src/ccan/array_size/_info
new file mode 100644
index 00000000..69570f34
--- /dev/null
+++ b/c_src/ccan/array_size/_info
@@ -0,0 +1,46 @@
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+
+/**
+ * array_size - routine for safely deriving the size of a visible array.
+ *
+ * This provides a simple ARRAY_SIZE() macro, which (given a good compiler)
+ * will also break compile if you try to use it on a pointer.
+ *
+ * This can ensure your code is robust to changes, without needing a gratuitous
+ * macro or constant.
+ *
+ * Example:
+ *	// Outputs "Initialized 32 values\n"
+ *	#include <ccan/array_size/array_size.h>
+ *	#include <stdlib.h>
+ *	#include <stdio.h>
+ *
+ *	// We currently use 32 random values.
+ *	static unsigned int vals[32];
+ *
+ *	int main(void)
+ *	{
+ *		unsigned int i;
+ *		for (i = 0; i < ARRAY_SIZE(vals); i++)
+ *			vals[i] = random();
+ *		printf("Initialized %u values\n", i);
+ *		return 0;
+ *	}
+ *
+ * License: CC0 (Public domain)
+ * Author: Rusty Russell <rusty@rustcorp.com.au>
+ */
+int main(int argc, char *argv[])
+{
+	if (argc != 2)
+		return 1;
+
+	if (strcmp(argv[1], "depends") == 0) {
+		printf("ccan/build_assert\n");
+		return 0;
+	}
+
+	return 1;
+}