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, 58 insertions, 0 deletions

diff --git a/c_src/include/linux/percpu-rwsem.h b/c_src/include/linux/percpu-rwsem.h
new file mode 100644
index 00000000..153251c0
--- /dev/null
+++ b/c_src/include/linux/percpu-rwsem.h
@@ -0,0 +1,58 @@
+
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_PERCPU_RWSEM_H
+#define _LINUX_PERCPU_RWSEM_H
+
+#include <pthread.h>
+#include <linux/preempt.h>
+
+struct percpu_rw_semaphore {
+	pthread_mutex_t		lock;
+};
+
+static inline void percpu_down_read_preempt_disable(struct percpu_rw_semaphore *sem)
+{
+	pthread_mutex_lock(&sem->lock);
+}
+
+static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
+{
+	pthread_mutex_lock(&sem->lock);
+}
+
+static inline int percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
+{
+	return !pthread_mutex_trylock(&sem->lock);
+}
+
+static inline void percpu_up_read_preempt_enable(struct percpu_rw_semaphore *sem)
+{
+	pthread_mutex_unlock(&sem->lock);
+}
+
+static inline void percpu_up_read(struct percpu_rw_semaphore *sem)
+{
+	pthread_mutex_unlock(&sem->lock);
+}
+
+static inline void percpu_down_write(struct percpu_rw_semaphore *sem)
+{
+	pthread_mutex_lock(&sem->lock);
+}
+
+static inline void percpu_up_write(struct percpu_rw_semaphore *sem)
+{
+	pthread_mutex_unlock(&sem->lock);
+}
+
+static inline void percpu_free_rwsem(struct percpu_rw_semaphore *sem) {}
+
+static inline int percpu_init_rwsem(struct percpu_rw_semaphore *sem)
+{
+	pthread_mutex_init(&sem->lock, NULL);
+	return 0;
+}
+
+#define percpu_rwsem_assert_held(sem)		do {} while (0)
+
+#endif