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Old 08-16-2006, 09:15 AM   #1
vipulc
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ext2 file system information


Hi, All

I want to parse ext2 file system of Red Hat Linux. So I want to know that where does the information lies regarding file system in Linux?

If that information is ecrypted then how to decrypt it that is also I want to know.

Thank you.
 
Old 08-16-2006, 09:51 AM   #2
marozsas
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Did you know "debugfs" ? I think is a good starting point. It is part of e2fsprogs package.
 
Old 08-17-2006, 03:00 AM   #3
vipulc
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EXT2 file system

Quote:
Originally Posted by marozsas
Did you know "debugfs" ? I think is a good starting point. It is part of e2fsprogs package.

Hi,

Actualy I want to parse ext2 file system manually.

I have made ext2 filesystem image by mke2fs command. shown as below,

# dd if=/dev/zero of=init-ramdisk.img bs=1k count=8k
# mke2fs -i 1024 -b 1024 -m 3 -F -v init-ramdisk.img
# mkdir temp
# mount -o loop init-ramdisk.img temp
# cd temp
# (Do what you need to do.)
# cd ..
# umount temp
# gzip -9 init-ramdisk.img

Now as you have mentioned debugfs gives me required information, but I dont want to use that utility I want to parse it on my own.

So, is there any thing like header in that ext2 file system image? From which I can parse various information of file system.
I tried to search for header but not able to understand.

kindly reply.

Thank you.
 
Old 08-17-2006, 11:39 AM   #4
marozsas
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I think that inspecting the source code of debugfs is the way...
You can find the source code for debugfs at e2fsprogs.sourceforge.net.

good luck !
 
Old 08-19-2006, 08:48 AM   #5
vipulc
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Quote:
Originally Posted by marozsas
I think that inspecting the source code of debugfs is the way...
You can find the source code for debugfs at e2fsprogs.sourceforge.net.

good luck !

Hi,

Can you please suggest me some good reference of websites from where I can get detail information of ext2 file system.

I searched a lot but still got half of the information which I required for ext2 file system.

Actualy I want thorough information of ext2 file system like
- at what offset superblock lies
- what is a size of group descriptor in filesystem
- what is a size of block bitmap and Inode bitmap and at what offset they lie.. etc.

Thank you.
 
  


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