rossi.fstools.fs.reiserfs
Class ReiserFileSystem

java.lang.Object
  rossi.fstools.fs.reiserfs.ReiserFileSystem

All Implemented Interfaces:

FileSystem

public class ReiserFileSystem

extends java.lang.Object

implements FileSystem

Representation of the reiser file system. Application code is to use this class.

Constructor Summary

ReiserFileSystem()

Method Summary

void	close() Close the underlying BlockReader used by this file system.
Device	createReiserDevice(StatDataItem sdItem) Create a Device from a StatDataItem.
Directory	createReiserDirectory(StatDataItem sdItem) Create a Directory given the StatDataItem describing it.
File	createReiserFile(StatDataItem sdItem) Creates a file for the given StatDataItem.
SymLink	createReiserSymLink(StatDataItem sdItem) Create a Symlink from a StatDataItem.
LeafNode	findLeaf(Key key) This is temporarily public just for testing.
LeafNode	findLeftMostLeaf(FBlock parent, int startblock) Gets the leftmost leaf of the given block if startblock points to an internal node.
Item	findNextItem(Key key) Finds the item whose key is equal to key if key exists in the tree.
Inode	getInode(InodePtr ptr) Gets an inode given a pointer.
protected FBlock	getNode(int blkno) Gets a tree node.
FsObject	getObject(Inode inode) Get the file system object that is pointed to by the given Inode.
InodePtr	getRootDir() Returns pointer to root directory.
LeafNode	nextLeaf(LeafNode current) Returns the next leaf following the given leaf.
SuperBlock	open(BlockReader br) Open a file system for reading.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReiserFileSystem

public ReiserFileSystem()

Method Detail

open

public SuperBlock open(BlockReader br)
                throws FsException,
                       java.io.IOException

Description copied from interface: FileSystem

Open a file system for reading. The BlockReader should be initialized to point to the phyical storage of the desired filesystem.

Specified by:

open in interface FileSystem

Parameters:

br - a BlockReader for accessing the physical filesystem.

Returns:

the filesystem's SuperBlock

Throws:

java.io.IOException

FsException - if the superblock cannot be parsed.

close

public void close()
           throws java.io.IOException

Description copied from interface: FileSystem

Close the underlying BlockReader used by this file system.

Specified by:

close in interface FileSystem

Throws:

java.io.IOException

getRootDir

public InodePtr getRootDir()

Returns pointer to root directory.

Specified by:

getRootDir in interface FileSystem

Returns:

InodePtr pointing to the root directory.

getNode

protected FBlock getNode(int blkno)
                  throws java.io.IOException,
                         FsException

Gets a tree node.

Throws:

java.io.IOException

FsException

getInode

public Inode getInode(InodePtr ptr)
               throws java.io.IOException,
                      FsException

Gets an inode given a pointer.

Specified by:

getInode in interface FileSystem

Parameters:

ptr - an InodePtr

Returns:

Inode pointed to by ptr

Throws:

FsException - if the Inode cannot be parsed.

java.io.IOException - if an IO error occurs

findLeaf

public LeafNode findLeaf(Key key)
                  throws FsException,
                         java.io.IOException

This is temporarily public just for testing. Find the first leaf node that may contain the given key -- if it exists.

Parameters:

key - the Key to look for.

Returns:

the leaf node containing the item pointed to by the key

Throws:

FsException

java.io.IOException

findLeftMostLeaf

public LeafNode findLeftMostLeaf(FBlock parent,
                                 int startblock)
                          throws FsException,
                                 java.io.IOException

Gets the leftmost leaf of the given block if startblock points to an internal node. If startblock points to a Leaf, just return it.

Parameters:

parent - a FBlock which is the parent of startblock

startblock - a int pointing to the starting node/leaf block.

Returns:

LeafNode the first leafnode within start block

Throws:

FsException - if a parsing error occurs.

java.io.IOException - if an IO error occurs

nextLeaf

public LeafNode nextLeaf(LeafNode current)
                  throws FsException,
                         java.io.IOException

Returns the next leaf following the given leaf.

Parameters:

current - The current leaf

Returns:

the leaf node just after (right of) the current leaf

Throws:

FsException - if the next leaf cant be found.

java.io.IOException - if an IO error occurs.

findNextItem

public Item findNextItem(Key key)
                  throws FsException,
                         java.io.IOException

Finds the item whose key is equal to key if key exists in the tree. Otherwise returns the next greater key.

Parameters:

key -

Returns:

Item

Throws:

FsException - if a parse error occurs

java.io.IOException - if an IO error occurs

createReiserSymLink

public SymLink createReiserSymLink(StatDataItem sdItem)
                            throws FsException,
                                   java.io.IOException

Create a Symlink from a StatDataItem.

Parameters:

sdItem - a StatDataItem

Returns:

SymLink

Throws:

FsException

java.io.IOException

createReiserFile

public File createReiserFile(StatDataItem sdItem)
                      throws FsException,
                             java.io.IOException

Creates a file for the given StatDataItem. The information in the StatDataItem is sufficent to create a Key to find the Direct and Indirect items that compose the file.

Parameters:

sdItem - a StatDataItem

Returns:

File

Throws:

FsException

java.io.IOException

createReiserDirectory

public Directory createReiserDirectory(StatDataItem sdItem)
                                throws FsException,
                                       java.io.IOException

Create a Directory given the StatDataItem describing it.

Parameters:

sdItem - a StatDataItem

Returns:

Directory

Throws:

FsException

java.io.IOException

createReiserDevice

public Device createReiserDevice(StatDataItem sdItem)
                          throws FsException,
                                 java.io.IOException

Create a Device from a StatDataItem.

Parameters:

sdItem - a StatDataItem

Returns:

Device

Throws:

FsException

java.io.IOException

getObject

public FsObject getObject(Inode inode)
                   throws FsException,
                          java.io.IOException

Get the file system object that is pointed to by the given Inode.

Specified by:

getObject in interface FileSystem

Parameters:

inode - a Inode

Returns:

FsObject

Throws:

FsException

java.io.IOException