// construct a RBW replica with the new GS
File blkfile = replicaInfo.getBlockFile();
FSVolume v = replicaInfo.getVolume();
if (v.getAvailable() < estimateBlockLen - replicaInfo.getNumBytes()) {
throw new DiskOutOfSpaceException("Insufficient space for appending to "
+ replicaInfo);
}
File newBlkFile = new File(v.rbwDir, replicaInfo.getBlockName());
File oldmeta = replicaInfo.getMetaFile();
ReplicaBeingWritten newReplicaInfo = new ReplicaBeingWritten(