Add vdo_initialize_component_states() to populate the super block, computing the space required for the main VDO components on disk. Those include the slab depot, block map, and recovery journal.
Signed-off-by: Bruce Johnston <[email protected]> --- drivers/md/dm-vdo/constants.h | 3 ++ drivers/md/dm-vdo/encodings.c | 82 +++++++++++++++++++++++++++++++++++ drivers/md/dm-vdo/encodings.h | 5 +++ 3 files changed, 90 insertions(+) diff --git a/drivers/md/dm-vdo/constants.h b/drivers/md/dm-vdo/constants.h index 2a8b03779f87..cc7bc3571ba1 100644 --- a/drivers/md/dm-vdo/constants.h +++ b/drivers/md/dm-vdo/constants.h @@ -44,6 +44,9 @@ enum { /* The default size of each slab journal, in blocks */ DEFAULT_VDO_SLAB_JOURNAL_SIZE = 224, + /* The recovery journal starting sequence number set at format time */ + RECOVERY_JOURNAL_STARTING_SEQUENCE_NUMBER = 1, + /* * The initial size of lbn_operations and pbn_operations, which is based upon the expected * maximum number of outstanding VIOs. This value was chosen to make it highly unlikely diff --git a/drivers/md/dm-vdo/encodings.c b/drivers/md/dm-vdo/encodings.c index 9961cb40f890..441c9aee1749 100644 --- a/drivers/md/dm-vdo/encodings.c +++ b/drivers/md/dm-vdo/encodings.c @@ -1488,6 +1488,88 @@ int vdo_decode_super_block(u8 *buffer) return ((checksum != saved_checksum) ? VDO_CHECKSUM_MISMATCH : VDO_SUCCESS); } +/** + * vdo_initialize_component_states() - Initialize the components so they can be written out. + * @vdo_config: The config used for component state initialization. + * @geometry: The volume geometry used to calculate the data region offset. + * @nonce: The nonce to use to identify the vdo. + * @states: The component states to initialize. + * + * Return: VDO_SUCCESS or an error code. + */ +int vdo_initialize_component_states(const struct vdo_config *vdo_config, + const struct volume_geometry *geometry, + nonce_t nonce, + struct vdo_component_states *states) +{ + int result; + struct slab_config slab_config; + struct partition *partition; + + states->vdo.config = *vdo_config; + states->vdo.nonce = nonce; + states->volume_version = VDO_VOLUME_VERSION_67_0; + + states->recovery_journal = (struct recovery_journal_state_7_0) { + .journal_start = RECOVERY_JOURNAL_STARTING_SEQUENCE_NUMBER, + .logical_blocks_used = 0, + .block_map_data_blocks = 0, + }; + + /* + * The layout starts 1 block past the beginning of the data region, as the + * data region contains the super block but the layout does not. + */ + result = vdo_initialize_layout(vdo_config->physical_blocks, + vdo_get_data_region_start(*geometry) + 1, + DEFAULT_VDO_BLOCK_MAP_TREE_ROOT_COUNT, + vdo_config->recovery_journal_size, + VDO_SLAB_SUMMARY_BLOCKS, + &states->layout); + if (result != VDO_SUCCESS) + return result; + + result = vdo_configure_slab(vdo_config->slab_size, + vdo_config->slab_journal_blocks, + &slab_config); + if (result != VDO_SUCCESS) { + vdo_uninitialize_layout(&states->layout); + return result; + } + + result = vdo_get_partition(&states->layout, VDO_SLAB_DEPOT_PARTITION, + &partition); + if (result != VDO_SUCCESS) { + vdo_uninitialize_layout(&states->layout); + return result; + } + + result = vdo_configure_slab_depot(partition, slab_config, 0, + &states->slab_depot); + if (result != VDO_SUCCESS) { + vdo_uninitialize_layout(&states->layout); + return result; + } + + result = vdo_get_partition(&states->layout, VDO_BLOCK_MAP_PARTITION, + &partition); + if (result != VDO_SUCCESS) { + vdo_uninitialize_layout(&states->layout); + return result; + } + + states->block_map = (struct block_map_state_2_0) { + .flat_page_origin = VDO_BLOCK_MAP_FLAT_PAGE_ORIGIN, + .flat_page_count = 0, + .root_origin = partition->offset, + .root_count = DEFAULT_VDO_BLOCK_MAP_TREE_ROOT_COUNT, + }; + + states->vdo.state = VDO_NEW; + + return VDO_SUCCESS; +} + /** * vdo_compute_index_blocks() - Compute the number of blocks that the indexer will use. * @config: The index config from which the blocks are calculated. diff --git a/drivers/md/dm-vdo/encodings.h b/drivers/md/dm-vdo/encodings.h index 0bc5ae696a6a..3cfbe4771a1c 100644 --- a/drivers/md/dm-vdo/encodings.h +++ b/drivers/md/dm-vdo/encodings.h @@ -1268,6 +1268,11 @@ int __must_check vdo_validate_component_states(struct vdo_component_states *stat void vdo_encode_super_block(u8 *buffer, struct vdo_component_states *states); int __must_check vdo_decode_super_block(u8 *buffer); +int vdo_initialize_component_states(const struct vdo_config *vdo_config, + const struct volume_geometry *geometry, + nonce_t nonce, + struct vdo_component_states *states); + /* We start with 0L and postcondition with ~0L to match our historical usage in userspace. */ static inline u32 vdo_crc32(const void *buf, unsigned long len) { -- 2.52.0
