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/* 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 */
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