projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |