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-rw-r--r--src/validation.h18
1 files changed, 17 insertions, 1 deletions
diff --git a/src/validation.h b/src/validation.h
index 94bf16968a..9114b24c94 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -361,8 +361,24 @@ class BlockManager
friend CChainState;
private:
- // See definition for documentation
+ /* Calculate the block/rev files to delete based on height specified by user with RPC command pruneblockchain */
void FindFilesToPruneManual(std::set<int>& setFilesToPrune, int nManualPruneHeight, int chain_tip_height);
+
+ /**
+ * 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, 1000 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, uint64_t nPruneAfterHeight, int chain_tip_height, bool is_ibd);
public: