From mboxrd@z Thu Jan  1 00:00:00 1970
From: greg.freemyer@gmail.com (Greg Freemyer)
Date: Mon, 21 Feb 2011 00:43:47 -0500
Subject: How to verify block numbers of file ?
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On Sun, Feb 20, 2011 at 9:02 AM, Abhijit Hoskeri
<abhijithoskeri@gmail.com> wrote:
> On Sun, Feb 20, 2011 at 6:52 PM, kashish bhatia <koolest77@gmail.com> wrote:
>> Is there any method/command/utility to know what are the block numbers which
>> are allocated to a file in ext2 fs?
>>
>
> The FIBMAP ioctl gives you the block number give an integer, which is
> the nth block attached to the inode. It includes blocks allocated to
> store indirect blocks too.
>
> -Abhijit

hdparm has a FIBMAP argument iirc.  I've never used it.

Greg