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

1 files changed, 33 insertions, 0 deletions

diff --git a/libbcachefs/two_state_shared_lock.c b/libbcachefs/two_state_shared_lock.c
new file mode 100644
index 00000000..dc508d54
--- /dev/null
+++ b/libbcachefs/two_state_shared_lock.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "two_state_shared_lock.h"
+
+void bch2_two_state_unlock(two_state_lock_t *lock, int s)
+{
+	long i = s ? 1 : -1;
+
+	BUG_ON(atomic_long_read(&lock->v) == 0);
+
+	if (atomic_long_sub_return_release(i, &lock->v) == 0)
+		wake_up_all(&lock->wait);
+}
+
+bool bch2_two_state_trylock(two_state_lock_t *lock, int s)
+{
+	long i = s ? 1 : -1;
+	long v = atomic_long_read(&lock->v), old;
+
+	do {
+		old = v;
+
+		if (i > 0 ? v < 0 : v > 0)
+			return false;
+	} while ((v = atomic_long_cmpxchg_acquire(&lock->v,
+					old, old + i)) != old);
+	return true;
+}
+
+void bch2_two_state_lock(two_state_lock_t *lock, int s)
+{
+	wait_event(lock->wait, bch2_two_state_trylock(lock, s));
+}