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Alter assumptions in CCoinsViewCache::BatchWrite

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Previously it would break if you flushed a parent cache while there was a child cache referring to it.  This change will allow the flushing of parent caches.
This commit is contained in:
Alex Morcos
2015-03-26 13:52:10 -04:00
parent 73fa5e6043
commit 072e2f8644
2 changed files with 28 additions and 7 deletions
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19
src/coins.cpp
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@@ -160,18 +160,23 @@ bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlockIn
if (it->second.flags & CCoinsCacheEntry::DIRTY) { // Ignore non-dirty entries (optimization).
CCoinsMap::iterator itUs = cacheCoins.find(it->first);
if (itUs == cacheCoins.end()) {
if (!it->second.coins.IsPruned()) {
// The parent cache does not have an entry, while the child
// cache does have (a non-pruned) one. Move the data up, and
// mark it as fresh (if the grandparent did have it, we
// would have pulled it in at first GetCoins).
assert(it->second.flags & CCoinsCacheEntry::FRESH);
// The parent cache does not have an entry, while the child does
// We can ignore it if it's both FRESH and pruned in the child
if (!(it->second.flags & CCoinsCacheEntry::FRESH && it->second.coins.IsPruned())) {
// Otherwise we will need to create it in the parent
// and move the data up and mark it as dirty
CCoinsCacheEntry& entry = cacheCoins[it->first];
entry.coins.swap(it->second.coins);
cachedCoinsUsage += entry.coins.DynamicMemoryUsage();
entry.flags = CCoinsCacheEntry::DIRTY | CCoinsCacheEntry::FRESH;
entry.flags = CCoinsCacheEntry::DIRTY;
// We can mark it FRESH in the parent if it was FRESH in the child
// Otherwise it might have just been flushed from the parent's cache
// and already exist in the grandparent
if (it->second.flags & CCoinsCacheEntry::FRESH)
entry.flags |= CCoinsCacheEntry::FRESH;
}
} else {
// Found the entry in the parent cache
if ((itUs->second.flags & CCoinsCacheEntry::FRESH) && it->second.coins.IsPruned()) {
// The grandparent does not have an entry, and the child is
// modified and being pruned. This means we can just delete