[#node-BlockManager-CheckBlockDataAvailability]
= xref:node.adoc[node]::xref:node/BlockManager.adoc[BlockManager]::CheckBlockDataAvailability
:relfileprefix: ../../
:mrdocs:

Check if all blocks in the [upper_block, lower_block]range have data available as defined by the status mask. The caller is responsible for ensuring that lower_block is an ancestor of upper_block (part of the same chain).

== Synopsis

Declared in `<node/blockstorage.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[requires_capability(0x7f2e1b099718), requires_capability(0x7f2e26d1ae78), requires_capability(0x7f2e375e0f58), requires_capability(0x7f2e33368318), requires_capability(0x7f2e3542f308), requires_capability(0x7f2e28a73e68)]]
bool
CheckBlockDataAvailability(
    xref:CBlockIndex.adoc[CBlockIndex] const& upper_block,
    xref:CBlockIndex.adoc[CBlockIndex] const& lower_block,
    xref:BlockStatus.adoc[BlockStatus] block_status = BLOCK_HAVE_DATA);
----

== Return Value

True if every block in the range has the required data.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *upper_block*
| The newest block in the range to check.
| *lower_block*
| The oldest block in the range to check; must be an ancestor of upper_block.
| *block_status*
| Status mask defining what counts as "data available".
|===


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