linux-ext4 - How to differentiate ext4 from ext2/3 in code?

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Date:	Fri, 31 May 2013 07:04:18 +0000 (UTC)
From:	Felipe Monteiro de Carvalho <felipemonteiro.carvalho@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: How to differentiate ext4 from ext2/3 in code?

Hello,

I am working on a software which has its own code to mount file systems, but 
when working on adding ext4 support I just noticed something strange. The 
ext2/3 reader already works quite well for ext4!

Also: EXT2_SUPER_MAGIC == EXT3_SUPER_MAGIC == EXT4_SUPER_MAGIC

So does anyone know what is the best way to differentiate in a file system 
reader between ext3 and ext4?

The best I came up so far would be checking the size of the superblock ... for 
ext3 it seams to be smaller I think ... but I guess people here might have 
better ideas.

thanks,

Felipe Monteiro de Carvalho

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