| 1 |
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| 2 | |
| 3 | * Copyright (C) 2011 Red Hat, Inc.
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| 4 | *
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| 5 | * This file is released under the GPL.
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| 6 |
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| 7 |
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| 8 | #ifndef DM_SPACE_MAP_METADATA_H
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| 9 | #define DM_SPACE_MAP_METADATA_H
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| 10 |
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| 11 | #include "dm-transaction-manager.h"
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| 12 |
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| 13 | #define DM_SM_METADATA_BLOCK_SIZE (4096 >> SECTOR_SHIFT)
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| 14 |
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| 15 | |
| 16 | * The metadata device is currently limited in size.
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| 17 | *
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| 18 | * We have one block of index, which can hold 255 index entries. Each
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| 19 | * index entry contains allocation info about ~16k metadata blocks.
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| 20 |
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| 21 | #define DM_SM_METADATA_MAX_BLOCKS (255 * ((1 << 14) - 64))
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| 22 | #define DM_SM_METADATA_MAX_SECTORS (DM_SM_METADATA_MAX_BLOCKS * DM_SM_METADATA_BLOCK_SIZE)
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| 23 |
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| 24 | |
| 25 | * Unfortunately we have to use two-phase construction due to the cycle
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| 26 | * between the tm and sm.
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| 27 |
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| 28 | struct dm_space_map *dm_sm_metadata_init(void);
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| 29 |
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| 30 | |
| 31 | * Create a fresh space map.
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| 32 |
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| 33 | int dm_sm_metadata_create(struct dm_space_map *sm,
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| 34 | struct dm_transaction_manager *tm,
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| 35 | dm_block_t nr_blocks,
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| 36 | dm_block_t superblock);
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| 37 |
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| 38 | |
| 39 | * Open from a previously-recorded root.
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| 40 |
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| 41 | int dm_sm_metadata_open(struct dm_space_map *sm,
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| 42 | struct dm_transaction_manager *tm,
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| 43 | void *root_le, size_t len);
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| 44 |
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| 45 | #endif
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