rossi.fstools.fs.ext2fs
Class Ext2SuperBlock

java.lang.Object
  rossi.fstools.fs.ext2fs.Ext2SuperBlock

All Implemented Interfaces:

DiskStructure, SuperBlock

public class Ext2SuperBlock

extends java.lang.Object

implements SuperBlock

Representation of ext2/3 superblock.

  On disk the superblock looks like this:

        31        24        16       8       0
        --------------------------------------
  0000  |        Inode Count                 |
        --------------------------------------
  0004  |        Blocks Count                |
        --------------------------------------
  0008  |        Reserved Blocks Count       |
        --------------------------------------
  000C  |        Free Blocks Count           |
        --------------------------------------
  0010  |        Free Inode Count            |
        --------------------------------------
  0014  |        First Data Block            |
        --------------------------------------
  0018  |        Block Size                  |
        --------------------------------------
  001C  |        Fragment Size               |
        --------------------------------------
  0020  |        Blocks Per Group            |
        --------------------------------------
  0024  |        Fragments Per Group         |
        --------------------------------------
  0028  |        Inodes Per Group            |
        --------------------------------------
  002C  |        Mount time                  |
        --------------------------------------
  0030  |        Write Time                  |
        --------------------------------------
  0034  | Mount Count    |  Max Mount Count  |
        --------------------------------------
  0038  | Magic          |  State            |
        --------------------------------------
  003C  | Errors         |  Minor Rev        |
        --------------------------------------
  0040  |        Last Check                  |
        --------------------------------------
  0044  |        Check Interval              |
        --------------------------------------
  0048  |        Creator OS                  |
        --------------------------------------
  004C  |        Revision Level              | 
        --------------------------------------
  0050  | Rsrvd UID      |  Rsrvd GID        |  
        --------------------------------------
  0054  | Fisrt Inode    |  Inode Size       |  For EXT2_DYNAMIC_REV only from here
        --------------------------------------
  0058  |     Block Group Number of this SB  |  
        --------------------------------------
  005C  |     Feature Compatible             |  
        --------------------------------------
  0060` |     Feature Incompatible           |  
        --------------------------------------
  0064  |     Feature RO Compatible          |  
        --------------------------------------
  0068  |       Volume UUID                  |  
        --------------------------------------
  006C  |       Volume UUID                  |  
        --------------------------------------
  0070  |       Volume UUID                  |  
        --------------------------------------
  0074  |       Volume UUID                  |  
        --------------------------------------
  0078  |       Volume name                  |  
        --------------------------------------
  007C  |       Volume name                  |  
        --------------------------------------
  0080  |       Volume name                  |  
        --------------------------------------
  0084  |       Volume name                  |  
        --------------------------------------
  0088  |       Last mounted dir             |  
        --------------------------------------
                      :
        --------------------------------------
  00C4  |       Last mounted dir             |  
        --------------------------------------
  00C8  |       Algorithm Usage bitmap       |  
        --------------------------------------
  00CC  | pre blk|pre dir|    Padding        |  
        --------------------------------------
  00D0  |       Journal UUID                 |  
        --------------------------------------
                      :
        --------------------------------------
  00DC  |        Journal UUID                |
        --------------------------------------
  00E0  |        Journal Inode               |
        --------------------------------------
  00E4  |        Journal Device              |
        --------------------------------------
  00E8  |        Last Orphan                 |
        --------------------------------------
  00EC  |        Hash Seed                   |
        --------------------------------------
                      :
        --------------------------------------
  00F8  |        Hash Seed                   |
        --------------------------------------
  00FC  | HashVer|HashChar|	 Hash Word       |
        --------------------------------------
  0100  |     Default Mount Options          |
        --------------------------------------
  0104  |     First meta block               |
        --------------------------------------
  0108  |       Padding                      |
        --------------------------------------
                      :
        --------------------------------------
  03FC  |       Padding                      |
        --------------------------------------

 

Field Summary

protected long	algorithmUsageBitmap
protected long	blockCount
protected long	blocksPerGroup
protected long	checkInterval
protected long	creatorOS
protected byte	defaultHashVersion
protected long	defaultMountOptions
protected int	defaultResGID
protected int	defaultResUID
protected int	errors
static int	EXT2_DYNAMIC_REV
static int	EXT2_FEATURE_COMPAT_DIR_INDEX
static int	EXT2_FEATURE_COMPAT_DIR_PREALLOC
static int	EXT2_FEATURE_COMPAT_EXT_ATTR
static int	EXT2_FEATURE_COMPAT_HAS_JOURNAL
static int	EXT2_FEATURE_COMPAT_IMAGIC_INODES
static int	EXT2_FEATURE_COMPAT_RESIZE_INODE
static int	EXT2_FEATURE_INCOMPAT_COMPRESSION
static int	EXT2_FEATURE_INCOMPAT_FILETYPE
static int	EXT2_FEATURE_INCOMPAT_JOURNAL_DEV
static int	EXT2_FEATURE_INCOMPAT_META_BG
static int	EXT2_FEATURE_INCOMPAT_RECOVER
static int	EXT2_FEATURE_RO_COMPAT_BTREE_DIR
static int	EXT2_FEATURE_RO_COMPAT_LARGE_FILE
static int	EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
static int	EXT2_GOOD_OLD_INODE_SIZE
static int	EXT2_GOOD_OLD_REV
static int	EXT2_MAX_BLOCK_SIZE
static int	EXT2_MAX_SUPPORTED_REV
static int	EXT2_MIN_BLOCK_SIZE
static int	EXT2_SUPER_MAGIC
protected long	featureCompat
protected long	featureInCompat
protected long	featureROCompat
protected long	firstDataBlock
protected long	firstInode
protected long	firstMetaBlockGroup
protected long	fragsPerGroup
protected long	freeBlocks
protected long	freeInodes
protected int	groupNumber
protected int[]	hashSeed
protected long	inodeCount
protected int	inodeSize
protected long	inodesPerGroup
protected long	journalDev
protected long	journalInode
protected byte[]	journalUniqueID
protected byte[]	label
protected long	lastCheck
protected byte[]	lastMountPoint
protected long	lastOrphan
protected long	logBlockSize
protected long	logFragSize
protected int	magic
protected int	maxMountCount
protected int	minorRevLevel
protected int	mountCount
protected long	mountTime
protected byte	preallocBlocks
protected byte	preallocDirBlocks
protected long	reservedBlockCount
protected byte	reservedCharPad
protected int	reservedWordPad
protected long	revLevel
protected int	state
protected byte[]	uniqueID
protected long	writeTime

Constructor Summary

Ext2SuperBlock()

Method Summary

long	getAlgorithmUsageBitmap()
long	getBlockCount()
long	getBlockSize() Gets the block size in bytes
long	getBlocksPerGroup()
long	getCheckInterval()
long	getCreatorOS()
int	getDataSize() Get the size in bytes of the structure.
byte	getDefaultHashVersion()
long	getDefaultMountOptions()
int	getDefaultResGID()
int	getDefaultResUID()
int	getErrors()
long	getFeatureCompat()
long	getFeatureInCompat()
long	getFeatureROCompat()
long	getFirstDataBlock()
long	getFirstInode()
long	getFirstMetaBlockGroup()
long	getFragSize() Gets the frag size in bytes
long	getFragsPerGroup()
long	getFreeBlocks()
long	getFreeInodes()
int	getGroupNumber()
int[]	getHashSeed()
long	getInodeCount()
int	getInodeSize() Get the size of an Inode.
long	getInodesPerGroup()
long	getJournalDev()
long	getJournalInode()
byte[]	getJournalUniqueID()
byte[]	getLabel()
long	getLastCheck()
byte[]	getLastMountPoint()
long	getLastOrphan()
long	getLogBlockSize()
long	getLogFragSize()
int	getMagic()
int	getMaxMountCount()
int	getMinorRevLevel()
int	getMountCount()
long	getMountTime()
byte	getPreallocBlocks()
byte	getPreallocDirBlocks()
long	getReservedBlockCount()
byte	getReservedCharPad()
int	getReservedWordPad()
long	getRevLevel()
int	getState()
byte[]	getUniqueID()
long	getWriteTime()
void	loadFromBuffer(byte[] buffer, int offset) Load from a buffer containint the superblock.
void	setAlgorithmUsageBitmap(long aAlgorithmUsageBitmap)
void	setBlockCount(long aBlockCount)
void	setBlocksPerGroup(long aBlocksPerGroup)
void	setCheckInterval(long aCheckInterval)
void	setCreatorOS(long aCreatorOS)
void	setDefaultHashVersion(byte aDefaultHashVersion)
void	setDefaultMountOptions(long aDefaultMountOptions)
void	setDefaultResGID(int aDefaultResGID)
void	setDefaultResUID(int aDefaultResUID)
void	setErrors(int aErrors)
void	setFeatureCompat(long aFeatureCompat)
void	setFeatureInCompat(long aFeatureInCompat)
void	setFeatureROCompat(long aFeatureROCompat)
void	setFirstDataBlock(long aFirstDataBlock)
void	setFirstInode(long aFirstInode)
void	setFirstMetaBlockGroup(long aFirstMetaBlockGroup)
void	setFragsPerGroup(long aFragsPerGroup)
void	setFreeBlocks(long aFreeBlocks)
void	setFreeInodes(long aFreeInodes)
void	setGroupNumber(int aGroupNumber)
void	setHashSeed(int[] aHashSeed)
void	setInodeCount(long aInodeCount)
void	setInodeSize(int aInodeSize)
void	setInodesPerGroup(long aInodesPerGroup)
void	setJournalDev(long aJournalDev)
void	setJournalInode(long aJournalInode)
void	setJournalUniqueID(byte[] aJournalUniqueID)
void	setLabel(byte[] aLabel)
void	setLastCheck(long aLastCheck)
void	setLastMountPoint(byte[] aLastMountPoint)
void	setLastOrphan(long aLastOrphan)
void	setLogBlockSize(long aLogBlockSize)
void	setLogFragSize(long aLogFragSize)
void	setMagic(int aMagic)
void	setMaxMountCount(int aMaxMountCount)
void	setMinorRevLevel(int aMinorRevLevel)
void	setMountCount(int aMountCount)
void	setMountTime(long aMountTime)
void	setPreallocBlocks(byte aPreallocBlocks)
void	setPreallocDirBlocks(byte aPreallocDirBlocks)
void	setReservedBlockCount(long aReservedBlockCount)
void	setReservedCharPad(byte aReservedCharPad)
void	setReservedWordPad(int aReservedWordPad)
void	setRevLevel(long aRevLevel)
void	setState(int aState)
void	setUniqueID(byte[] aUniqueID)
void	setWriteTime(long aWriteTime)

Methods inherited from class java.lang.Object

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

Field Detail

inodeCount

protected long inodeCount

blockCount

protected long blockCount

reservedBlockCount

protected long reservedBlockCount

freeBlocks

protected long freeBlocks

freeInodes

protected long freeInodes

firstDataBlock

protected long firstDataBlock

logBlockSize

protected long logBlockSize

logFragSize

protected long logFragSize

blocksPerGroup

protected long blocksPerGroup

fragsPerGroup

protected long fragsPerGroup

inodesPerGroup

protected long inodesPerGroup

mountTime

protected long mountTime

writeTime

protected long writeTime

mountCount

protected int mountCount

maxMountCount

protected int maxMountCount

magic

protected int magic

state

protected int state

errors

protected int errors

minorRevLevel

protected int minorRevLevel

lastCheck

protected long lastCheck

checkInterval

protected long checkInterval

creatorOS

protected long creatorOS

revLevel

protected long revLevel

defaultResUID

protected int defaultResUID

defaultResGID

protected int defaultResGID

firstInode

protected long firstInode

inodeSize

protected int inodeSize

groupNumber

protected int groupNumber

featureCompat

protected long featureCompat

featureInCompat

protected long featureInCompat

featureROCompat

protected long featureROCompat

uniqueID

protected byte[] uniqueID

label

protected byte[] label

lastMountPoint

protected byte[] lastMountPoint

algorithmUsageBitmap

protected long algorithmUsageBitmap

preallocBlocks

protected byte preallocBlocks

preallocDirBlocks

protected byte preallocDirBlocks

journalUniqueID

protected byte[] journalUniqueID

journalInode

protected long journalInode

journalDev

protected long journalDev

lastOrphan

protected long lastOrphan

hashSeed

protected int[] hashSeed

defaultHashVersion

protected byte defaultHashVersion

reservedCharPad

protected byte reservedCharPad

reservedWordPad

protected int reservedWordPad

defaultMountOptions

protected long defaultMountOptions

firstMetaBlockGroup

protected long firstMetaBlockGroup

EXT2_GOOD_OLD_REV

public static final int EXT2_GOOD_OLD_REV

See Also:

Constant Field Values

EXT2_DYNAMIC_REV

public static final int EXT2_DYNAMIC_REV

See Also:

Constant Field Values

EXT2_GOOD_OLD_INODE_SIZE

public static final int EXT2_GOOD_OLD_INODE_SIZE

See Also:

Constant Field Values

EXT2_MAX_SUPPORTED_REV

public static final int EXT2_MAX_SUPPORTED_REV

See Also:

Constant Field Values

EXT2_FEATURE_COMPAT_DIR_PREALLOC

public static final int EXT2_FEATURE_COMPAT_DIR_PREALLOC

See Also:

Constant Field Values

EXT2_FEATURE_COMPAT_IMAGIC_INODES

public static final int EXT2_FEATURE_COMPAT_IMAGIC_INODES

See Also:

Constant Field Values

EXT2_FEATURE_COMPAT_HAS_JOURNAL

public static final int EXT2_FEATURE_COMPAT_HAS_JOURNAL

See Also:

Constant Field Values

EXT2_FEATURE_COMPAT_EXT_ATTR

public static final int EXT2_FEATURE_COMPAT_EXT_ATTR

See Also:

Constant Field Values

EXT2_FEATURE_COMPAT_RESIZE_INODE

public static final int EXT2_FEATURE_COMPAT_RESIZE_INODE

See Also:

Constant Field Values

EXT2_FEATURE_COMPAT_DIR_INDEX

public static final int EXT2_FEATURE_COMPAT_DIR_INDEX

See Also:

Constant Field Values

EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER

public static final int EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER

See Also:

Constant Field Values

EXT2_FEATURE_RO_COMPAT_LARGE_FILE

public static final int EXT2_FEATURE_RO_COMPAT_LARGE_FILE

See Also:

Constant Field Values

EXT2_FEATURE_RO_COMPAT_BTREE_DIR

public static final int EXT2_FEATURE_RO_COMPAT_BTREE_DIR

See Also:

Constant Field Values

EXT2_FEATURE_INCOMPAT_COMPRESSION

public static final int EXT2_FEATURE_INCOMPAT_COMPRESSION

See Also:

Constant Field Values

EXT2_FEATURE_INCOMPAT_FILETYPE

public static final int EXT2_FEATURE_INCOMPAT_FILETYPE

See Also:

Constant Field Values

EXT2_FEATURE_INCOMPAT_RECOVER

public static final int EXT2_FEATURE_INCOMPAT_RECOVER

See Also:

Constant Field Values

EXT2_FEATURE_INCOMPAT_JOURNAL_DEV

public static final int EXT2_FEATURE_INCOMPAT_JOURNAL_DEV

See Also:

Constant Field Values

EXT2_FEATURE_INCOMPAT_META_BG

public static final int EXT2_FEATURE_INCOMPAT_META_BG

See Also:

Constant Field Values

EXT2_SUPER_MAGIC

public static final int EXT2_SUPER_MAGIC

See Also:

Constant Field Values

EXT2_MIN_BLOCK_SIZE

public static final int EXT2_MIN_BLOCK_SIZE

See Also:

Constant Field Values

EXT2_MAX_BLOCK_SIZE

public static final int EXT2_MAX_BLOCK_SIZE

See Also:

Constant Field Values

Constructor Detail

Ext2SuperBlock

public Ext2SuperBlock()

Method Detail

getDataSize

public int getDataSize()

Description copied from interface: DiskStructure

Get the size in bytes of the structure. For variable length sturctures this may represent the minimum length rather than the actual length.

Specified by:

getDataSize in interface DiskStructure

Returns:

the size of the structure.

getInodeCount

public long getInodeCount()

setInodeCount

public void setInodeCount(long aInodeCount)

getBlockCount

public long getBlockCount()

setBlockCount

public void setBlockCount(long aBlockCount)

getReservedBlockCount

public long getReservedBlockCount()

setReservedBlockCount

public void setReservedBlockCount(long aReservedBlockCount)

getFreeBlocks

public long getFreeBlocks()

setFreeBlocks

public void setFreeBlocks(long aFreeBlocks)

getFreeInodes

public long getFreeInodes()

setFreeInodes

public void setFreeInodes(long aFreeInodes)

getFirstDataBlock

public long getFirstDataBlock()

setFirstDataBlock

public void setFirstDataBlock(long aFirstDataBlock)

getLogBlockSize

public long getLogBlockSize()

setLogBlockSize

public void setLogBlockSize(long aLogBlockSize)

getBlockSize

public long getBlockSize()

Gets the block size in bytes

getLogFragSize

public long getLogFragSize()

setLogFragSize

public void setLogFragSize(long aLogFragSize)

getFragSize

public long getFragSize()

Gets the frag size in bytes

getBlocksPerGroup

public long getBlocksPerGroup()

setBlocksPerGroup

public void setBlocksPerGroup(long aBlocksPerGroup)

getFragsPerGroup

public long getFragsPerGroup()

setFragsPerGroup

public void setFragsPerGroup(long aFragsPerGroup)

getInodesPerGroup

public long getInodesPerGroup()

setInodesPerGroup

public void setInodesPerGroup(long aInodesPerGroup)

getMountTime

public long getMountTime()

setMountTime

public void setMountTime(long aMountTime)

getWriteTime

public long getWriteTime()

setWriteTime

public void setWriteTime(long aWriteTime)

getMountCount

public int getMountCount()

setMountCount

public void setMountCount(int aMountCount)

getMaxMountCount

public int getMaxMountCount()

setMaxMountCount

public void setMaxMountCount(int aMaxMountCount)

getMagic

public int getMagic()

setMagic

public void setMagic(int aMagic)

getState

public int getState()

setState

public void setState(int aState)

getErrors

public int getErrors()

setErrors

public void setErrors(int aErrors)

getMinorRevLevel

public int getMinorRevLevel()

setMinorRevLevel

public void setMinorRevLevel(int aMinorRevLevel)

getLastCheck

public long getLastCheck()

setLastCheck

public void setLastCheck(long aLastCheck)

getCheckInterval

public long getCheckInterval()

setCheckInterval

public void setCheckInterval(long aCheckInterval)

getCreatorOS

public long getCreatorOS()

setCreatorOS

public void setCreatorOS(long aCreatorOS)

getRevLevel

public long getRevLevel()

setRevLevel

public void setRevLevel(long aRevLevel)

getDefaultResUID

public int getDefaultResUID()

setDefaultResUID

public void setDefaultResUID(int aDefaultResUID)

getDefaultResGID

public int getDefaultResGID()

setDefaultResGID

public void setDefaultResGID(int aDefaultResGID)

getFirstInode

public long getFirstInode()

setFirstInode

public void setFirstInode(long aFirstInode)

getInodeSize

public int getInodeSize()

Get the size of an Inode. Typically this is 128 bytes, but in theory it can be some other size.

setInodeSize

public void setInodeSize(int aInodeSize)

getGroupNumber

public int getGroupNumber()

setGroupNumber

public void setGroupNumber(int aGroupNumber)

getFeatureCompat

public long getFeatureCompat()

setFeatureCompat

public void setFeatureCompat(long aFeatureCompat)

getFeatureInCompat

public long getFeatureInCompat()

setFeatureInCompat

public void setFeatureInCompat(long aFeatureInCompat)

getFeatureROCompat

public long getFeatureROCompat()

setFeatureROCompat

public void setFeatureROCompat(long aFeatureROCompat)

getUniqueID

public byte[] getUniqueID()

setUniqueID

public void setUniqueID(byte[] aUniqueID)

getLabel

public byte[] getLabel()

setLabel

public void setLabel(byte[] aLabel)

getLastMountPoint

public byte[] getLastMountPoint()

setLastMountPoint

public void setLastMountPoint(byte[] aLastMountPoint)

getAlgorithmUsageBitmap

public long getAlgorithmUsageBitmap()

setAlgorithmUsageBitmap

public void setAlgorithmUsageBitmap(long aAlgorithmUsageBitmap)

getPreallocBlocks

public byte getPreallocBlocks()

setPreallocBlocks

public void setPreallocBlocks(byte aPreallocBlocks)

getPreallocDirBlocks

public byte getPreallocDirBlocks()

setPreallocDirBlocks

public void setPreallocDirBlocks(byte aPreallocDirBlocks)

getJournalUniqueID

public byte[] getJournalUniqueID()

setJournalUniqueID

public void setJournalUniqueID(byte[] aJournalUniqueID)

getJournalInode

public long getJournalInode()

setJournalInode

public void setJournalInode(long aJournalInode)

getJournalDev

public long getJournalDev()

setJournalDev

public void setJournalDev(long aJournalDev)

getLastOrphan

public long getLastOrphan()

setLastOrphan

public void setLastOrphan(long aLastOrphan)

getHashSeed

public int[] getHashSeed()

setHashSeed

public void setHashSeed(int[] aHashSeed)

getDefaultHashVersion

public byte getDefaultHashVersion()

setDefaultHashVersion

public void setDefaultHashVersion(byte aDefaultHashVersion)

getReservedCharPad

public byte getReservedCharPad()

setReservedCharPad

public void setReservedCharPad(byte aReservedCharPad)

getReservedWordPad

public int getReservedWordPad()

setReservedWordPad

public void setReservedWordPad(int aReservedWordPad)

getDefaultMountOptions

public long getDefaultMountOptions()

setDefaultMountOptions

public void setDefaultMountOptions(long aDefaultMountOptions)

getFirstMetaBlockGroup

public long getFirstMetaBlockGroup()

setFirstMetaBlockGroup

public void setFirstMetaBlockGroup(long aFirstMetaBlockGroup)

loadFromBuffer

public void loadFromBuffer(byte[] buffer,
                           int offset)
                    throws FsException

Load from a buffer containint the superblock. We assume that the superblock begins at the specified offset within the buffer

Specified by:

loadFromBuffer in interface DiskStructure

Parameters:

buffer - a byte[] containing data to be read in populating the object

offset - a int indicating the offset within the buffer to start parsing.

Throws:

FsException - if a parse error occurs.