From: Felipe Monteiro de Carvalho <felipemonteiro.carvalho@gmail.com>
Subject: Re: Block allocation in EXT4
Date: Mon, 26 Aug 2013 19:45:44 +0200
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To: Subranshu Patel <spatel.ml@gmail.com>
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Hello,

I'm no expert, but I think that you should read i_node.i_flags and
check it for the flag EXT4_EXTENTS_FL to determine which inodes use
the old or the new (extents) method of allocation.

I'm not sure what your objective is, so hopefully this helps something =)

-- 
Felipe Monteiro de Carvalho