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, 31 insertions, 0 deletions

diff --git a/c_src/include/linux/mm.h b/c_src/include/linux/mm.h
new file mode 100644
index 00000000..744a14ce
--- /dev/null
+++ b/c_src/include/linux/mm.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TOOLS_LINUX_MM_H
+#define _TOOLS_LINUX_MM_H
+
+#include <sys/syscall.h>
+#include <linux/types.h>
+
+struct sysinfo {
+	long uptime;		/* Seconds since boot */
+	unsigned long loads[3];	/* 1, 5, and 15 minute load averages */
+	unsigned long totalram;	/* Total usable main memory size */
+	unsigned long freeram;	/* Available memory size */
+	unsigned long sharedram;	/* Amount of shared memory */
+	unsigned long bufferram;	/* Memory used by buffers */
+	unsigned long totalswap;	/* Total swap space size */
+	unsigned long freeswap;	/* swap space still available */
+	__u16 procs;		   	/* Number of current processes */
+	__u16 pad;		   	/* Explicit padding for m68k */
+	unsigned long totalhigh;	/* Total high memory size */
+	unsigned long freehigh;	/* Available high memory size */
+	__u32 mem_unit;			/* Memory unit size in bytes */
+};
+
+
+
+static inline void si_meminfo(struct sysinfo *val)
+{
+	BUG_ON(syscall(SYS_sysinfo, val));
+}
+
+#endif /* _TOOLS_LINUX_MM_H */