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validation: add CChainState::m_disabled and ChainMan::isUsable

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and remove m_snapshot_validated. This state can now be inferred by the
number of isUsable chainstates.

m_disabled is used to signal that a chainstate should no longer be used
by validation logic; it is used as a sentinel when background validation
completes or if the snapshot chainstate is found to be invalid.

isUsable is a convenience method that incorporates m_disabled.
This commit is contained in:
James O'Beirne 2022-02-02 14:40:47 -05:00
parent 5ee22cdafd
commit c29f26b47b
3 changed files with 39 additions and 17 deletions
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19
src/validation.cpp
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@ -4859,12 +4859,8 @@ std::vector<Chainstate*> ChainstateManager::GetAll()
LOCK(::cs_main);
std::vector<Chainstate*> out;
if (!IsSnapshotValidated() && m_ibd_chainstate) {
out.push_back(m_ibd_chainstate.get());
}
if (m_snapshot_chainstate) {
out.push_back(m_snapshot_chainstate.get());
for (Chainstate* cs : {m_ibd_chainstate.get(), m_snapshot_chainstate.get()}) {
if (this->IsUsable(cs)) out.push_back(cs);
}
return out;
@ -5263,17 +5259,22 @@ bool ChainstateManager::IsSnapshotActive() const
void ChainstateManager::MaybeRebalanceCaches()
{
AssertLockHeld(::cs_main);
if (m_ibd_chainstate && !m_snapshot_chainstate) {
bool ibd_usable = this->IsUsable(m_ibd_chainstate.get());
bool snapshot_usable = this->IsUsable(m_snapshot_chainstate.get());
assert(ibd_usable || snapshot_usable);
if (ibd_usable && !snapshot_usable) {
LogPrintf("[snapshot] allocating all cache to the IBD chainstate\n");
// Allocate everything to the IBD chainstate.
m_ibd_chainstate->ResizeCoinsCaches(m_total_coinstip_cache, m_total_coinsdb_cache);
}
else if (m_snapshot_chainstate && !m_ibd_chainstate) {
else if (snapshot_usable && !ibd_usable) {
// If background validation has completed and snapshot is our active chain...
LogPrintf("[snapshot] allocating all cache to the snapshot chainstate\n");
// Allocate everything to the snapshot chainstate.
m_snapshot_chainstate->ResizeCoinsCaches(m_total_coinstip_cache, m_total_coinsdb_cache);
}
else if (m_ibd_chainstate && m_snapshot_chainstate) {
else if (ibd_usable && snapshot_usable) {
// If both chainstates exist, determine who needs more cache based on IBD status.
//
// Note: shrink caches first so that we don't inadvertently overwhelm available memory.