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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright (C) 2011 Red Hat, Inc.4 *5 * This file is released under the GPL.6 */7 8#ifndef DM_SPACE_MAP_METADATA_H9#define DM_SPACE_MAP_METADATA_H10 11#include "dm-transaction-manager.h"12 13#define DM_SM_METADATA_BLOCK_SIZE (4096 >> SECTOR_SHIFT)14 15/*16 * The metadata device is currently limited in size.17 *18 * We have one block of index, which can hold 255 index entries. Each19 * index entry contains allocation info about ~16k metadata blocks.20 */21#define DM_SM_METADATA_MAX_BLOCKS (255 * ((1 << 14) - 64))22#define DM_SM_METADATA_MAX_SECTORS (DM_SM_METADATA_MAX_BLOCKS * DM_SM_METADATA_BLOCK_SIZE)23 24/*25 * Unfortunately we have to use two-phase construction due to the cycle26 * between the tm and sm.27 */28struct dm_space_map *dm_sm_metadata_init(void);29 30/*31 * Create a fresh space map.32 */33int dm_sm_metadata_create(struct dm_space_map *sm,34 struct dm_transaction_manager *tm,35 dm_block_t nr_blocks,36 dm_block_t superblock);37 38/*39 * Open from a previously-recorded root.40 */41int dm_sm_metadata_open(struct dm_space_map *sm,42 struct dm_transaction_manager *tm,43 void *root_le, size_t len);44 45#endif /* DM_SPACE_MAP_METADATA_H */46