/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.util;
/**
* Utility method called in alluxio-mount.sh to calculate space for Mac OS X HFS+.
* Metadata zone size is estimated by using specifications noted at
* http://dubeiko.com/development/FileSystems/HFSPLUS/tn1150.html#MetadataZone,
* which is slightly larger than actually metadata zone size created by hdiuitl command.
*/
public final class HFSUtils {
/**
* Converts the memory size to number of sectors.
*
* @param requestSize requested filesystem size in bytes
* @param sectorSize the size of each sector in bytes
* @return total sectors of HFS+ including estimated metadata zone size
*/
public static long getNumSector(String requestSize, String sectorSize) {
Double memSize = Double.parseDouble(requestSize);
Double sectorBytes = Double.parseDouble(sectorSize);
Double nSectors = memSize / sectorBytes;
Double memSizeKB = memSize / 1024;
Double memSizeGB = memSize / (1024 * 1024 * 1024);
Double memSize100GB = memSizeGB / 100;
// allocation bitmap file: one bit per sector
Double allocBitmapSize = nSectors / 8;
// extend overflow file: 4MB, plus 4MB per 100GB
Double extOverflowFileSize = memSize100GB * 1024 * 1024 * 4;
// journal file: 8MB, plus 8MB per 100GB
Double journalFileSize = memSize100GB * 1024 * 1024 * 8;
// catalog file: 10bytes per KB
Double catalogFileSize = memSizeKB * 10;
// hot files: 5bytes per KB
Double hotFileSize = memSizeKB * 5;
// quota users file and quota groups file
Double quotaUsersFileSize = (memSizeGB * 256 + 1) * 64;
Double quotaGroupsFileSize = (memSizeGB * 32 + 1) * 64;
Double metadataSize = allocBitmapSize + extOverflowFileSize + journalFileSize
+ catalogFileSize + hotFileSize + quotaUsersFileSize + quotaGroupsFileSize;
Double allocSize = memSize + metadataSize;
Double numSectors = allocSize / sectorBytes;
System.out.println(numSectors.longValue() + 1); // round up
return numSectors.longValue() + 1;
}
/**
* The main class to invoke the getNumSector.
*
* @param args the arguments parsed by commandline
*/
public static void main(String[] args) {
if (args.length != 2) {
System.exit(-1);
}
String mem = args[0];
String sector = args[1];
try {
getNumSector(mem, sector);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private HFSUtils() {} // prevent instantiation
}