1 files changed, 50 insertions, 0 deletions
diff --git a/c_src/libbcachefs/nocow_locking.h b/c_src/libbcachefs/nocow_locking.h
new file mode 100644
index 00000000..f9d6a426
--- /dev/null
+++ b/c_src/libbcachefs/nocow_locking.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_NOCOW_LOCKING_H
+#define _BCACHEFS_NOCOW_LOCKING_H
+
+#include "bcachefs.h"
+#include "alloc_background.h"
+#include "nocow_locking_types.h"
+
+#include <linux/hash.h>
+
+static inline struct nocow_lock_bucket *bucket_nocow_lock(struct bucket_nocow_lock_table *t,
+							  u64 dev_bucket)
+{
+	unsigned h = hash_64(dev_bucket, BUCKET_NOCOW_LOCKS_BITS);
+
+	return t->l + (h & (BUCKET_NOCOW_LOCKS - 1));
+}
+
+#define BUCKET_NOCOW_LOCK_UPDATE	(1 << 0)
+
+bool bch2_bucket_nocow_is_locked(struct bucket_nocow_lock_table *, struct bpos);
+void bch2_bucket_nocow_unlock(struct bucket_nocow_lock_table *, struct bpos, int);
+bool __bch2_bucket_nocow_trylock(struct nocow_lock_bucket *, u64, int);
+void __bch2_bucket_nocow_lock(struct bucket_nocow_lock_table *,
+			      struct nocow_lock_bucket *, u64, int);
+
+static inline void bch2_bucket_nocow_lock(struct bucket_nocow_lock_table *t,
+					  struct bpos bucket, int flags)
+{
+	u64 dev_bucket = bucket_to_u64(bucket);
+	struct nocow_lock_bucket *l = bucket_nocow_lock(t, dev_bucket);
+
+	__bch2_bucket_nocow_lock(t, l, dev_bucket, flags);
+}
+
+static inline bool bch2_bucket_nocow_trylock(struct bucket_nocow_lock_table *t,
+					  struct bpos bucket, int flags)
+{
+	u64 dev_bucket = bucket_to_u64(bucket);
+	struct nocow_lock_bucket *l = bucket_nocow_lock(t, dev_bucket);
+
+	return __bch2_bucket_nocow_trylock(l, dev_bucket, flags);
+}
+
+void bch2_nocow_locks_to_text(struct printbuf *, struct bucket_nocow_lock_table *);
+
+void bch2_fs_nocow_locking_exit(struct bch_fs *);
+int bch2_fs_nocow_locking_init(struct bch_fs *);
+
+#endif /* _BCACHEFS_NOCOW_LOCKING_H */