1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/md/dm-vdo/indexer/index-layout.h b/drivers/md/dm-vdo/indexer/index-layout.h
new file mode 100644
index 000000000..e9ac6f430
--- /dev/null
+++ b/drivers/md/dm-vdo/indexer/index-layout.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright 2023 Red Hat
+ */
+
+#ifndef UDS_INDEX_LAYOUT_H
+#define UDS_INDEX_LAYOUT_H
+
+#include "config.h"
+#include "indexer.h"
+#include "io-factory.h"
+
+/*
+ * The index layout describes the format of the index on the underlying storage, and is responsible
+ * for creating those structures when the index is first created. It also validates the index data
+ * when loading a saved index, and updates it when saving the index.
+ */
+
+struct index_layout;
+
+int __must_check uds_make_index_layout(struct uds_configuration *config, bool new_layout,
+				       struct index_layout **layout_ptr);
+
+void uds_free_index_layout(struct index_layout *layout);
+
+int __must_check uds_replace_index_layout_storage(struct index_layout *layout,
+						  struct block_device *bdev);
+
+int __must_check uds_load_index_state(struct index_layout *layout,
+				      struct uds_index *index);
+
+int __must_check uds_save_index_state(struct index_layout *layout,
+				      struct uds_index *index);
+
+int __must_check uds_discard_open_chapter(struct index_layout *layout);
+
+u64 __must_check uds_get_volume_nonce(struct index_layout *layout);
+
+int __must_check uds_open_volume_bufio(struct index_layout *layout, size_t block_size,
+				       unsigned int reserved_buffers,
+				       struct dm_bufio_client **client_ptr);
+
+#endif /* UDS_INDEX_LAYOUT_H */