| Joe Thornber | 3241b1d | 2011-10-31 20:19:11 +0000 | [diff] [blame] | 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 | |
| Mike Snitzer | 7d48935 | 2014-02-12 23:58:15 -0500 | [diff] [blame] | 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 | |
| Joe Thornber | 3241b1d | 2011-10-31 20:19:11 +0000 | [diff] [blame] | 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 */ |