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3241b1d3 JT |
1 | /* |
2 | * Copyright (C) 2011 Red Hat, Inc. | |
3 | * | |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7 | #ifndef DM_SPACE_MAP_METADATA_H | |
8 | #define DM_SPACE_MAP_METADATA_H | |
9 | ||
10 | #include "dm-transaction-manager.h" | |
11 | ||
7d48935e MS |
12 | #define DM_SM_METADATA_BLOCK_SIZE (4096 >> SECTOR_SHIFT) |
13 | ||
14 | /* | |
15 | * The metadata device is currently limited in size. | |
16 | * | |
17 | * We have one block of index, which can hold 255 index entries. Each | |
18 | * index entry contains allocation info about ~16k metadata blocks. | |
19 | */ | |
20 | #define DM_SM_METADATA_MAX_BLOCKS (255 * ((1 << 14) - 64)) | |
21 | #define DM_SM_METADATA_MAX_SECTORS (DM_SM_METADATA_MAX_BLOCKS * DM_SM_METADATA_BLOCK_SIZE) | |
22 | ||
3241b1d3 JT |
23 | /* |
24 | * Unfortunately we have to use two-phase construction due to the cycle | |
25 | * between the tm and sm. | |
26 | */ | |
27 | struct dm_space_map *dm_sm_metadata_init(void); | |
28 | ||
29 | /* | |
30 | * Create a fresh space map. | |
31 | */ | |
32 | int dm_sm_metadata_create(struct dm_space_map *sm, | |
33 | struct dm_transaction_manager *tm, | |
34 | dm_block_t nr_blocks, | |
35 | dm_block_t superblock); | |
36 | ||
37 | /* | |
38 | * Open from a previously-recorded root. | |
39 | */ | |
40 | int dm_sm_metadata_open(struct dm_space_map *sm, | |
41 | struct dm_transaction_manager *tm, | |
42 | void *root_le, size_t len); | |
43 | ||
44 | #endif /* DM_SPACE_MAP_METADATA_H */ |