Update bcachefs sources to 9abf628c70 bcachefs: Fix a spurious error in fsck

1 files changed, 72 insertions, 0 deletions

diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h
new file mode 100644
index 00000000..c233e3ce
--- /dev/null
+++ b/include/linux/percpu-rwsem.h
@@ -0,0 +1,72 @@
+
+/* 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_rwlock_t	lock;
+};
+
+#define DEFINE_STATIC_PERCPU_RWSEM(name)				\
+static DEFINE_PER_CPU(unsigned int, __percpu_rwsem_rc_##name);		\
+static struct percpu_rw_semaphore name = {				\
+	.rss = __RCU_SYNC_INITIALIZER(name.rss, RCU_SCHED_SYNC),	\
+	.read_count = &__percpu_rwsem_rc_##name,			\
+	.rw_sem = __RWSEM_INITIALIZER(name.rw_sem),			\
+	.writer = __RCUWAIT_INITIALIZER(name.writer),			\
+}
+
+extern int __percpu_down_read(struct percpu_rw_semaphore *, int);
+extern void __percpu_up_read(struct percpu_rw_semaphore *);
+
+static inline void percpu_down_read_preempt_disable(struct percpu_rw_semaphore *sem)
+{
+	pthread_rwlock_rdlock(&sem->lock);
+	preempt_disable();
+}
+
+static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
+{
+	pthread_rwlock_rdlock(&sem->lock);
+}
+
+static inline int percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
+{
+	return !pthread_rwlock_tryrdlock(&sem->lock);
+}
+
+static inline void percpu_up_read_preempt_enable(struct percpu_rw_semaphore *sem)
+{
+	preempt_enable();
+	pthread_rwlock_unlock(&sem->lock);
+}
+
+static inline void percpu_up_read(struct percpu_rw_semaphore *sem)
+{
+	pthread_rwlock_unlock(&sem->lock);
+}
+
+static inline void percpu_down_write(struct percpu_rw_semaphore *sem)
+{
+	pthread_rwlock_wrlock(&sem->lock);
+}
+
+static inline void percpu_up_write(struct percpu_rw_semaphore *sem)
+{
+	pthread_rwlock_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_rwlock_init(&sem->lock, NULL);
+	return 0;
+}
+
+#define percpu_rwsem_assert_held(sem)		do {} while (0)
+
+#endif