| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
|---|
| 2 | /* |
|---|
| 3 | * Copyright (C) 2011 Red Hat, Inc. |
|---|
| 4 | * |
|---|
| 5 | * This file is released under the GPL. |
|---|
| 6 | */ |
|---|
| 7 | |
|---|
| 8 | #ifndef DM_SPACE_MAP_METADATA_H |
|---|
| 9 | #define DM_SPACE_MAP_METADATA_H |
|---|
| 10 | |
|---|
| 11 | #include "dm-transaction-manager.h" |
|---|
| 12 | |
|---|
| 13 | #define DM_SM_METADATA_BLOCK_SIZE (4096 >> SECTOR_SHIFT) |
|---|
| 14 | |
|---|
| 15 | /* |
|---|
| 16 | * The metadata device is currently limited in size. |
|---|
| 17 | * |
|---|
| 18 | * We have one block of index, which can hold 255 index entries. Each |
|---|
| 19 | * index entry contains allocation info about ~16k metadata blocks. |
|---|
| 20 | */ |
|---|
| 21 | #define DM_SM_METADATA_MAX_BLOCKS (255 * ((1 << 14) - 64)) |
|---|
| 22 | #define DM_SM_METADATA_MAX_SECTORS (DM_SM_METADATA_MAX_BLOCKS * DM_SM_METADATA_BLOCK_SIZE) |
|---|
| 23 | |
|---|
| 24 | /* |
|---|
| 25 | * Unfortunately we have to use two-phase construction due to the cycle |
|---|
| 26 | * between the tm and sm. |
|---|
| 27 | */ |
|---|
| 28 | struct dm_space_map *dm_sm_metadata_init(void); |
|---|
| 29 | |
|---|
| 30 | /* |
|---|
| 31 | * Create a fresh space map. |
|---|
| 32 | */ |
|---|
| 33 | int dm_sm_metadata_create(struct dm_space_map *sm, |
|---|
| 34 | struct dm_transaction_manager *tm, |
|---|
| 35 | dm_block_t nr_blocks, |
|---|
| 36 | dm_block_t superblock); |
|---|
| 37 | |
|---|
| 38 | /* |
|---|
| 39 | * Open from a previously-recorded root. |
|---|
| 40 | */ |
|---|
| 41 | int dm_sm_metadata_open(struct dm_space_map *sm, |
|---|
| 42 | struct dm_transaction_manager *tm, |
|---|
| 43 | void *root_le, size_t len); |
|---|
| 44 | |
|---|
| 45 | #endif /* DM_SPACE_MAP_METADATA_H */ |
|---|
| 46 | |
|---|
