1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/md/dm-vdo/indexer/io-factory.h b/drivers/md/dm-vdo/indexer/io-factory.h
new file mode 100644
index 000000000..7fb5a0616
--- /dev/null
+++ b/drivers/md/dm-vdo/indexer/io-factory.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright 2023 Red Hat
+ */
+
+#ifndef UDS_IO_FACTORY_H
+#define UDS_IO_FACTORY_H
+
+#include <linux/dm-bufio.h>
+
+/*
+ * The I/O factory manages all low-level I/O operations to the underlying storage device. Its main
+ * clients are the index layout and the volume. The buffered reader and buffered writer interfaces
+ * are helpers for accessing data in a contiguous range of storage blocks.
+ */
+
+struct buffered_reader;
+struct buffered_writer;
+
+struct io_factory;
+
+enum {
+	UDS_BLOCK_SIZE = 4096,
+	SECTORS_PER_BLOCK = UDS_BLOCK_SIZE >> SECTOR_SHIFT,
+};
+
+int __must_check uds_make_io_factory(struct block_device *bdev,
+				     struct io_factory **factory_ptr);
+
+int __must_check uds_replace_storage(struct io_factory *factory,
+				     struct block_device *bdev);
+
+void uds_put_io_factory(struct io_factory *factory);
+
+size_t __must_check uds_get_writable_size(struct io_factory *factory);
+
+int __must_check uds_make_bufio(struct io_factory *factory, off_t block_offset,
+				size_t block_size, unsigned int reserved_buffers,
+				struct dm_bufio_client **client_ptr);
+
+int __must_check uds_make_buffered_reader(struct io_factory *factory, off_t offset,
+					  u64 block_count,
+					  struct buffered_reader **reader_ptr);
+
+void uds_free_buffered_reader(struct buffered_reader *reader);
+
+int __must_check uds_read_from_buffered_reader(struct buffered_reader *reader, u8 *data,
+					       size_t length);
+
+int __must_check uds_verify_buffered_data(struct buffered_reader *reader, const u8 *value,
+					  size_t length);
+
+int __must_check uds_make_buffered_writer(struct io_factory *factory, off_t offset,
+					  u64 block_count,
+					  struct buffered_writer **writer_ptr);
+
+void uds_free_buffered_writer(struct buffered_writer *buffer);
+
+int __must_check uds_write_to_buffered_writer(struct buffered_writer *writer,
+					      const u8 *data, size_t length);
+
+int __must_check uds_flush_buffered_writer(struct buffered_writer *writer);
+
+#endif /* UDS_IO_FACTORY_H */