/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.fs.ext2;
import org.jnode.fs.FileSystemException;
/**
* This class stores nonpersistent information about the inode.
* It also contains a reference to the part of the inode table
* which contains this inode.
*
* @author Andras Nagy
*/
public class INodeDescriptor {
private int iNodeNr;
/* The number of blocks allocated for the iNode is not necessary equal to its size in blocks:
* <ul>
* <li>if a block has been allocated but not yet been written
* <li>if the file is in the process of being truncated, i.e. some blocks have already been
* freed, but the new size has not yet been set.
* </ul>
* The lastAllocatedBlockIndex attribute is always the index of the last allocated block
*/
private long lastAllocatedBlockIndex = -1;
//which block group contains the inode
private int group;
//the index of the inode in the block group
private int index;
//the inode table that contains this inode
private INodeTable iNodeTable;
//preallocated blocks are maintained as long as the inode is in memory.
//When it is flushed(), unused preallocated blocks must be freed in the
//block bitmap.
private long preallocBlock;
private int preallocCount;
public synchronized long usePreallocBlock() throws FileSystemException {
if (preallocCount <= 0) {
throw new FileSystemException("No preallocated blocks");
}
--preallocCount;
return preallocBlock++;
}
public INodeDescriptor(INodeTable iNodeTable, int iNodeNr, int group, int index) {
this.iNodeTable = iNodeTable;
this.iNodeNr = iNodeNr;
this.group = group;
this.index = index;
preallocCount = 0;
}
public int getPreallocCount() {
return preallocCount;
}
public synchronized void setPreallocBlock(long l) {
preallocBlock = l;
}
public synchronized void setPreallocCount(int l) {
preallocCount = l;
}
/**
* Returns in which block group the inode is placed
* @return int
*/
public int getGroup() {
return group;
}
/**
* Returns the index of the inode in its inode table (there is an inode
* which block group the inode is placed
* @return int
*/
public int getIndex() {
return index;
}
/**
* Returns the inode table that contains this inode
* @return the INode table
*/
public INodeTable getINodeTable() {
return iNodeTable;
}
public long getLastAllocatedBlockIndex() {
return lastAllocatedBlockIndex;
}
public void setLastAllocatedBlockIndex(long l) {
lastAllocatedBlockIndex = l;
}
public int getINodeNr() {
return iNodeNr;
}
}