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44 lines
1.1 KiB
44 lines
1.1 KiB
/* |
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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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