(trunk libT) #2551 "when uploading to peers, prefetch local data from disk" -- commit jch patch #2, which prefetches before checksumming an individual piece

libtransmission/inout.c

@@ -308,6 +308,8 @@ recalculateHash( tr_torrent       * tor,
     SHA1_Init( &sha );
     bytesLeft = tr_torPieceCountBytes( tor, pieceIndex );
 
+    tr_ioPrefetch( tor, pieceIndex, offset, bytesLeft );
+
     while( bytesLeft )
     {
         const int len = MIN( bytesLeft, buflen );