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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * Copyright (C) 2011 Red Hat, Inc.
- *
- * This file is released under the GPL.
- */
- #ifndef DM_SPACE_MAP_METADATA_H
- #define DM_SPACE_MAP_METADATA_H
- #include "dm-transaction-manager.h"
- #define DM_SM_METADATA_BLOCK_SIZE (4096 >> SECTOR_SHIFT)
- /*
- * The metadata device is currently limited in size.
- *
- * We have one block of index, which can hold 255 index entries. Each
- * index entry contains allocation info about ~16k metadata blocks.
- */
- #define DM_SM_METADATA_MAX_BLOCKS (255 * ((1 << 14) - 64))
- #define DM_SM_METADATA_MAX_SECTORS (DM_SM_METADATA_MAX_BLOCKS * DM_SM_METADATA_BLOCK_SIZE)
- /*
- * Unfortunately we have to use two-phase construction due to the cycle
- * between the tm and sm.
- */
- struct dm_space_map *dm_sm_metadata_init(void);
- /*
- * Create a fresh space map.
- */
- int dm_sm_metadata_create(struct dm_space_map *sm,
- struct dm_transaction_manager *tm,
- dm_block_t nr_blocks,
- dm_block_t superblock);
- /*
- * Open from a previously-recorded root.
- */
- int dm_sm_metadata_open(struct dm_space_map *sm,
- struct dm_transaction_manager *tm,
- void *root_le, size_t len);
- #endif /* DM_SPACE_MAP_METADATA_H */
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