| /* |
| * Copyright (C) 2011 Red Hat, Inc. |
| * |
| * This file is released under the GPL. |
| */ |
| |
| #ifndef DM_SPACE_MAP_METADATA_H |
| #define DM_SPACE_MAP_METADATA_H |
| |
| #include "dm-transaction-manager.h" |
| |
| #define DM_SM_METADATA_BLOCK_SIZE (4096 >> SECTOR_SHIFT) |
| |
| /* |
| * The metadata device is currently limited in size. |
| * |
| * We have one block of index, which can hold 255 index entries. Each |
| * index entry contains allocation info about ~16k metadata blocks. |
| */ |
| #define DM_SM_METADATA_MAX_BLOCKS (255 * ((1 << 14) - 64)) |
| #define DM_SM_METADATA_MAX_SECTORS (DM_SM_METADATA_MAX_BLOCKS * DM_SM_METADATA_BLOCK_SIZE) |
| |
| /* |
| * Unfortunately we have to use two-phase construction due to the cycle |
| * between the tm and sm. |
| */ |
| struct dm_space_map *dm_sm_metadata_init(void); |
| |
| /* |
| * Create a fresh space map. |
| */ |
| int dm_sm_metadata_create(struct dm_space_map *sm, |
| struct dm_transaction_manager *tm, |
| dm_block_t nr_blocks, |
| dm_block_t superblock); |
| |
| /* |
| * Open from a previously-recorded root. |
| */ |
| int dm_sm_metadata_open(struct dm_space_map *sm, |
| struct dm_transaction_manager *tm, |
| void *root_le, size_t len); |
| |
| #endif /* DM_SPACE_MAP_METADATA_H */ |