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-rw-r--r--src/main.cpp7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/main.cpp b/src/main.cpp
index 1d881c0a35..2b4acccb9e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1806,6 +1806,13 @@ bool SetBestChain(CValidationState &state, CBlockIndex* pindexNew)
// Make sure it's successfully written to disk before changing memory structure
bool fIsInitialDownload = IsInitialBlockDownload();
if (!fIsInitialDownload || pcoinsTip->GetCacheSize() > nCoinCacheSize) {
+ // Typical CCoins structures on disk are around 100 bytes in size.
+ // Pushing a new one to the database can cause it to be written
+ // twice (once in the log, and once in the tables). This is already
+ // an overestimation, as most will delete an existing entry or
+ // overwrite one. Still, use a conservative safety factor of 2.
+ if (!CheckDiskSpace(100 * 2 * 2 * pcoinsTip->GetCacheSize()))
+ return state.Error();
FlushBlockFile();
pblocktree->Sync();
if (!pcoinsTip->Flush())