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, 51 insertions, 0 deletions

diff --git a/c_src/include/linux/time64.h b/c_src/include/linux/time64.h
new file mode 100644
index 00000000..cd6cc1c1
--- /dev/null
+++ b/c_src/include/linux/time64.h
@@ -0,0 +1,51 @@
+#ifndef _LINUX_TIME64_H
+#define _LINUX_TIME64_H
+
+#include <linux/types.h>
+
+#define timespec64  timespec
+
+typedef __s64 time64_t;
+
+/* Parameters used to convert the timespec values: */
+#define MSEC_PER_SEC	1000L
+#define USEC_PER_MSEC	1000L
+#define NSEC_PER_USEC	1000L
+#define NSEC_PER_MSEC	1000000L
+#define USEC_PER_SEC	1000000L
+#define NSEC_PER_SEC	1000000000L
+#define FSEC_PER_SEC	1000000000000000LL
+
+static inline struct timespec ns_to_timespec(const u64 nsec)
+{
+	return (struct timespec) {
+		.tv_sec = nsec / NSEC_PER_SEC,
+		.tv_nsec = nsec % NSEC_PER_SEC,
+	};
+}
+
+static inline s64 timespec_to_ns(const struct timespec *ts)
+{
+	return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
+}
+
+static inline struct timespec timespec_trunc(struct timespec t, unsigned gran)
+{
+	/* Avoid division in the common cases 1 ns and 1 s. */
+	if (gran == 1) {
+		/* nothing */
+	} else if (gran == NSEC_PER_SEC) {
+		t.tv_nsec = 0;
+	} else if (gran > 1 && gran < NSEC_PER_SEC) {
+		t.tv_nsec -= t.tv_nsec % gran;
+	} else {
+		WARN(1, "illegal file time granularity: %u", gran);
+	}
+	return t;
+}
+
+#define ns_to_timespec64	ns_to_timespec
+#define timespec64_to_ns	timespec_to_ns
+#define timespec64_trunc	timespec_trunc
+
+#endif /* _LINUX_TIME64_H */