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-rw-r--r--kernel/xloop_file_fmt_qcow_cache.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/kernel/xloop_file_fmt_qcow_cache.h b/kernel/xloop_file_fmt_qcow_cache.h
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+++ b/kernel/xloop_file_fmt_qcow_cache.h
@@ -0,0 +1,51 @@
+/* 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