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, 0 insertions, 71 deletions

diff --git a/linux/int_sqrt.c b/linux/int_sqrt.c
deleted file mode 100644
index a8170bb9..00000000
--- a/linux/int_sqrt.c
+++ /dev/null
@@ -1,71 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2013 Davidlohr Bueso <davidlohr.bueso@hp.com>
- *
- *  Based on the shift-and-subtract algorithm for computing integer
- *  square root from Guy L. Steele.
- */
-
-#include <linux/export.h>
-#include <linux/bitops.h>
-#include <linux/limits.h>
-#include <linux/math.h>
-
-/**
- * int_sqrt - computes the integer square root
- * @x: integer of which to calculate the sqrt
- *
- * Computes: floor(sqrt(x))
- */
-unsigned long int_sqrt(unsigned long x)
-{
-	unsigned long b, m, y = 0;
-
-	if (x <= 1)
-		return x;
-
-	m = 1UL << (__fls(x) & ~1UL);
-	while (m != 0) {
-		b = y + m;
-		y >>= 1;
-
-		if (x >= b) {
-			x -= b;
-			y += m;
-		}
-		m >>= 2;
-	}
-
-	return y;
-}
-EXPORT_SYMBOL(int_sqrt);
-
-#if BITS_PER_LONG < 64
-/**
- * int_sqrt64 - strongly typed int_sqrt function when minimum 64 bit input
- * is expected.
- * @x: 64bit integer of which to calculate the sqrt
- */
-u32 int_sqrt64(u64 x)
-{
-	u64 b, m, y = 0;
-
-	if (x <= ULONG_MAX)
-		return int_sqrt((unsigned long) x);
-
-	m = 1ULL << ((fls64(x) - 1) & ~1ULL);
-	while (m != 0) {
-		b = y + m;
-		y >>= 1;
-
-		if (x >= b) {
-			x -= b;
-			y += m;
-		}
-		m >>= 2;
-	}
-
-	return y;
-}
-EXPORT_SYMBOL(int_sqrt64);
-#endif