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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2023 Red Hat
*/
#ifndef UDS_INDEX_PAGE_MAP_H
#define UDS_INDEX_PAGE_MAP_H
#include "geometry.h"
#include "io-factory.h"
/*
* The index maintains a page map which records how the chapter delta lists are distributed among
* the index pages for each chapter, allowing the volume to be efficient about reading only pages
* that it knows it will need.
*/
struct index_page_map {
const struct index_geometry *geometry;
u64 last_update;
u32 entries_per_chapter;
u16 *entries;
};
int __must_check uds_make_index_page_map(const struct index_geometry *geometry,
struct index_page_map **map_ptr);
void uds_free_index_page_map(struct index_page_map *map);
int __must_check uds_read_index_page_map(struct index_page_map *map,
struct buffered_reader *reader);
int __must_check uds_write_index_page_map(struct index_page_map *map,
struct buffered_writer *writer);
void uds_update_index_page_map(struct index_page_map *map, u64 virtual_chapter_number,
u32 chapter_number, u32 index_page_number,
u32 delta_list_number);
u32 __must_check uds_find_index_page_number(const struct index_page_map *map,
const struct uds_record_name *name,
u32 chapter_number);
void uds_get_list_number_bounds(const struct index_page_map *map, u32 chapter_number,
u32 index_page_number, u32 *lowest_list,
u32 *highest_list);
u64 uds_compute_index_page_map_save_size(const struct index_geometry *geometry);
#endif /* UDS_INDEX_PAGE_MAP_H */
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