diff options
Diffstat (limited to 'src/main.h')
| -rw-r--r-- | src/main.h | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/src/main.h b/src/main.h index bb6fd6f204..d34f6c30d1 100644 --- a/src/main.h +++ b/src/main.h @@ -132,6 +132,26 @@ extern CBlockIndex *pindexBestHeader; /** Minimum disk space required - used in CheckDiskSpace() */ static const uint64_t nMinDiskSpace = 52428800; +/** Pruning-related variables and constants */ +/** True if any block files have ever been pruned. */ +extern bool fHavePruned; +/** True if we're running in -prune mode. */ +extern bool fPruneMode; +/** Number of MiB of block files that we're trying to stay below. */ +extern uint64_t nPruneTarget; +/** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of chainActive.Tip() will not be pruned. */ +static const signed int MIN_BLOCKS_TO_KEEP = 288; + +// Require that user allocate at least 550MB for block & undo files (blk???.dat and rev???.dat) +// At 1MB per block, 288 blocks = 288MB. +// Add 15% for Undo data = 331MB +// Add 20% for Orphan block rate = 397MB +// We want the low water mark after pruning to be at least 397 MB and since we prune in +// full block file chunks, we need the high water mark which triggers the prune to be +// one 128MB block file + added 15% undo data = 147MB greater for a total of 545MB +// Setting the target to > than 550MB will make it likely we can respect the target. +static const signed int MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024; + /** Register with a network node to receive its signals */ void RegisterNodeSignals(CNodeSignals& nodeSignals); /** Unregister a network node */ @@ -186,6 +206,28 @@ bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock, b bool ActivateBestChain(CValidationState &state, CBlock *pblock = NULL); CAmount GetBlockValue(int nHeight, const CAmount& nFees); +/** + * Prune block and undo files (blk???.dat and undo???.dat) so that the disk space used is less than a user-defined target. + * The user sets the target (in MB) on the command line or in config file. This will be run on startup and whenever new + * space is allocated in a block or undo file, staying below the target. Changing back to unpruned requires a reindex + * (which in this case means the blockchain must be re-downloaded.) + * + * Pruning functions are called from FlushStateToDisk when the global fCheckForPruning flag has been set. + * Block and undo files are deleted in lock-step (when blk00003.dat is deleted, so is rev00003.dat.) + * Pruning cannot take place until the longest chain is at least a certain length (100000 on mainnet, 1000 on testnet, 10 on regtest). + * Pruning will never delete a block within a defined distance (currently 288) from the active chain's tip. + * The block index is updated by unsetting HAVE_DATA and HAVE_UNDO for any blocks that were stored in the deleted files. + * A db flag records the fact that at least some block files have been pruned. + * + * @param[out] setFilesToPrune The set of file indices that can be unlinked will be returned + */ +void FindFilesToPrune(std::set<int>& setFilesToPrune); + +/** + * Actually unlink the specified files + */ +void UnlinkPrunedFiles(std::set<int>& setFilesToPrune); + /** Create a new block index entry for a given block hash */ CBlockIndex * InsertBlockIndex(uint256 hash); /** Abort with a message */ @@ -196,7 +238,8 @@ bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats); void Misbehaving(NodeId nodeid, int howmuch); /** Flush all state, indexes and buffers to disk. */ void FlushStateToDisk(); - +/** Prune block files and flush state to disk. */ +void PruneAndFlush(); /** (try to) add transaction to memory pool **/ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransaction &tx, bool fLimitFree, |