Update bcachefs sources to 8d3fc97ca3 bcachefs: Fixes for building in userspace

1 files changed, 28 insertions, 0 deletions

diff --git a/libbcachefs/two_state_shared_lock.h b/libbcachefs/two_state_shared_lock.h
new file mode 100644
index 00000000..1b4f1089
--- /dev/null
+++ b/libbcachefs/two_state_shared_lock.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_TWO_STATE_LOCK_H
+#define _BCACHEFS_TWO_STATE_LOCK_H
+
+#include <linux/atomic.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+/*
+ * Two-state lock - can be taken for add or block - both states are shared,
+ * like read side of rwsem, but conflict with other state:
+ */
+typedef struct {
+	atomic_long_t		v;
+	wait_queue_head_t	wait;
+} two_state_lock_t;
+
+static inline void two_state_lock_init(two_state_lock_t *lock)
+{
+	atomic_long_set(&lock->v, 0);
+	init_waitqueue_head(&lock->wait);
+}
+
+void bch2_two_state_unlock(two_state_lock_t *, int);
+bool bch2_two_state_trylock(two_state_lock_t *, int);
+void bch2_two_state_lock(two_state_lock_t *, int);
+
+#endif /* _BCACHEFS_TWO_STATE_LOCK_H */