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The EXT2 Superblock
The Superblock contains a description of the basic size and shape of this file system.
The information within it allows the file system manager to use and maintain the file system.
Usually only the Superblock in Block Group 0 is read when the file system is mounted
but each Block Group contains a duplicate copy in case of file system corruption.
Amongst other information it holds the:
- Magic Number
- This allows the mounting software to check that this is
indeed the Superblock for an EXT2 file system. For the current version of
EXT2 this is 0xEF53.
- Revision Level
- The major and minor revision levels allow the mounting
code to determine whether or not this file system supports features
that are only available in particular revisions of the file system.
There are also feature compatibility fields which help the mounting code
to determine which new features can safely be used on this file system,
- Mount Count and Maximum Mount Count
- Together these allow the system to
determine if the file system should be fully checked. The mount count
is incremented each time the file system is mounted and when it equals
the maximum mount count the warning message ``maximal mount count reached,
running e2fsck is recommended'' is displayed,
- Block Group Number
- The Block Group number that holds this copy of
- Block Size
- The size of the block for this file system in bytes, for
example 1024 bytes,
- Blocks per Group
- The number of blocks in a group. Like the block size
this is fixed when the file system is created,
- Free Blocks
- The number of free blocks in the file system,
- Free Inodes
- The number of free Inodes in the file system,
- First Inode
- This is the inode number of the first inode in the file system.
The first inode in an EXT2 root file system would be the directory entry
for the '/' directory.
Copyright 1996-1999 by David Rusling. Licensed under GNU General Public License (Used with permission of the author). See here for details. All rights reserved. || |
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