long getDfsUsed() throws IOException {
return dfsUsage.getUsed();
}
File addBlock(Block b, File f) throws IOException {
File blockFile = dataDir.addBlock(b, f);
File metaFile = getMetaFile(blockFile, b);
dfsUsage.incDfsUsed(b.getNumBytes() + metaFile.length());
return blockFile;
}
void decDfsUsed(long value) {
dfsUsage.decDfsUsed(value);
}