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/* SPDX-License-Identifier: GPL-2.0 */
/*
* xloop_file_fmt_qcow_cache.h
*
* Ported QCOW2 implementation of the QEMU project (GPL-2.0):
* L2/refcount table cache for the QCOW2 format.
*
* The copyright (C) 2010 of the original code is owned by
* Kevin Wolf <kwolf@redhat.com>
*
* Copyright (C) 2019 Manuel Bentele <development@manuel-bentele.de>
*/
#ifndef _LINUX_XLOOP_FILE_FMT_QCOW_CACHE_H
#define _LINUX_XLOOP_FILE_FMT_QCOW_CACHE_H
#include "xloop_file_fmt.h"
struct xloop_file_fmt_qcow_cache_table {
s64 offset;
u64 lru_counter;
int ref;
bool dirty;
};
struct xloop_file_fmt_qcow_cache {
struct xloop_file_fmt_qcow_cache_table *entries;
struct xloop_file_fmt_qcow_cache *depends;
int size;
int table_size;
bool depends_on_flush;
void *table_array;
u64 lru_counter;
u64 cache_clean_lru_counter;
};
extern struct xloop_file_fmt_qcow_cache *xloop_file_fmt_qcow_cache_create(
struct xloop_file_fmt *xlo_fmt,
int num_tables,
unsigned table_size);
extern void xloop_file_fmt_qcow_cache_destroy(struct xloop_file_fmt *xlo_fmt);
extern int xloop_file_fmt_qcow_cache_get(struct xloop_file_fmt *xlo_fmt,
u64 offset,
void **table);
extern void xloop_file_fmt_qcow_cache_put(struct xloop_file_fmt *xlo_fmt,
void **table);
#endif
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