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Merge bitcoin/bitcoin#22895: consensus: don't call GetBlockPos in ReadBlockFromDisk without cs_main lock

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350e034e64d175f3db4c85ddca42e76e279912f6 consensus: don't call GetBlockPos in ReadBlockFromDisk without lock (Jon Atack)

Pull request description:

  Commit ccd8ef65 "Reduce cs_main lock in ReadBlockFromDisk, only read GetBlockPos under the lock" in #11281 moved the cs_main lock from caller to `ReadBlockFromDisk()` for calling `CBlockIndex::GetBlockPos()`, but the second invocation doesn't have the lock, and IIUC there is no guarantee the compiler can know if state has changed.

  Use the `blockPos` local variable instead, rename it to `block_pos`, and make it const.

ACKs for top commit:
  laanwj:
    Code review ACK 350e034e64d175f3db4c85ddca42e76e279912f6
  theStack:
    Code-review ACK 350e034e64d175f3db4c85ddca42e76e279912f6
  promag:
    Code review ACK 350e034e64d175f3db4c85ddca42e76e279912f6.

Tree-SHA512: 0df0614ab1876885c85f7b53c604a759a29008da8027e95503b4726d2b820ec6d27546020c613337ff954406e01cb5d191978ba4a12124052fed6e1b0e9a226f
This commit is contained in:
W. J. van der Laan 2021-09-16 16:53:47 +02:00 committed by pasta
parent 808926be7e
commit f9b22b61e6
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GPG Key ID: 52527BEDABE87984
1 changed files with 3 additions and 7 deletions
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10
src/node/blockstorage.cpp
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@ -72,18 +72,14 @@ bool ReadBlockFromDisk(CBlock& block, const FlatFilePos& pos, const Consensus::P
bool ReadBlockFromDisk(CBlock& block, const CBlockIndex* pindex, const Consensus::Params& consensusParams)
{
FlatFilePos blockPos;
{
LOCK(cs_main);
blockPos = pindex->GetBlockPos();
}
const FlatFilePos block_pos{WITH_LOCK(cs_main, return pindex->GetBlockPos())};
if (!ReadBlockFromDisk(block, blockPos, consensusParams)) {
if (!ReadBlockFromDisk(block, block_pos, consensusParams)) {
return false;
}
if (block.GetHash() != pindex->GetBlockHash()) {
return error("ReadBlockFromDisk(CBlock&, CBlockIndex*): GetHash() doesn't match index for %s at %s",
pindex->ToString(), pindex->GetBlockPos().ToString());
pindex->ToString(), block_pos.ToString());
}
return true;
}