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