Commit e073bb09 authored by Bruce Johnston's avatar Bruce Johnston Committed by Mikulas Patocka
Browse files

dm vdo: add super block initialization to encodings.c 



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: default avatarBruce Johnston <bjohnsto@redhat.com>
Reviewed-by: default avatarMatthew Sakai <msakai@redhat.com>
Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
parent 4b4a8d95

drivers/md/dm-vdo/constants.h

+3 −0
Original line number Diff line number Diff line
@@ -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

drivers/md/dm-vdo/encodings.c

+82 −0
Original line number Diff line number Diff line
@@ -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.

drivers/md/dm-vdo/encodings.h

+5 −0
Original line number Diff line number Diff line
@@ -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)

{