/* * 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 */