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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2023 Red Hat
*/
#ifndef UDS_CHAPTER_INDEX_H
#define UDS_CHAPTER_INDEX_H
#include <linux/limits.h>
#include "delta-index.h"
#include "geometry.h"
/*
* A chapter index for an open chapter is a mutable structure that tracks all the records that have
* been added to the chapter. A chapter index for a closed chapter is similar except that it is
* immutable because the contents of a closed chapter can never change, and the immutable structure
* is more efficient. Both types of chapter index are implemented with a delta index.
*/
/* The value returned when no entry is found in the chapter index. */
#define NO_CHAPTER_INDEX_ENTRY U16_MAX
struct open_chapter_index {
const struct index_geometry *geometry;
struct delta_index delta_index;
u64 virtual_chapter_number;
u64 volume_nonce;
size_t memory_size;
};
int __must_check uds_make_open_chapter_index(struct open_chapter_index **chapter_index,
const struct index_geometry *geometry,
u64 volume_nonce);
void uds_free_open_chapter_index(struct open_chapter_index *chapter_index);
void uds_empty_open_chapter_index(struct open_chapter_index *chapter_index,
u64 virtual_chapter_number);
int __must_check uds_put_open_chapter_index_record(struct open_chapter_index *chapter_index,
const struct uds_record_name *name,
u32 page_number);
int __must_check uds_pack_open_chapter_index_page(struct open_chapter_index *chapter_index,
u8 *memory, u32 first_list,
bool last_page, u32 *lists_packed);
int __must_check uds_initialize_chapter_index_page(struct delta_index_page *index_page,
const struct index_geometry *geometry,
u8 *page_buffer, u64 volume_nonce);
int __must_check uds_validate_chapter_index_page(const struct delta_index_page *index_page,
const struct index_geometry *geometry);
int __must_check uds_search_chapter_index_page(struct delta_index_page *index_page,
const struct index_geometry *geometry,
const struct uds_record_name *name,
u16 *record_page_ptr);
#endif /* UDS_CHAPTER_INDEX_H */
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