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Date: Wed, 31 Aug 2011 13:26:27 -0500 (CDT)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
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To: basarevych@gmail.com, freebsd-questions@freebsd.org
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Cc: 
Subject: Re: Is there way to get filename for specific LBA?
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> From owner-freebsd-questions@freebsd.org  Tue Aug 30 22:14:58 2011
> Date: Wed, 31 Aug 2011 06:11:24 +0300
> From: Ross <basarevych@gmail.com>
> To: freebsd-questions@freebsd.org
> Subject: Is there way to get filename for specific LBA?
>
> Aug 31 05:13:24 da kernel: ad6: WARNING - READ_DMA UDMA ICRC error
> (retrying request) LBA=107491647
> #  dd if=/dev/ad6 of=/dev/null bs=1m seek=107491647 count=1
> dd: /dev/null: Inappropriate ioctl for device
>
> Another question: why does it fail?

*I* would call that a 'bug'.  <wry grin>
>
>
> # dd if=/dev/ad6 of=/var/tmp/xxxx bs=1m seek=107491647 count=1
> 1+0 records in
> 1+0 records out
> 1048576 bytes transferred in 0.026658 secs (39334650 bytes/sec)
>
> So no errors. I looked at bsdlabel a   it's partition f, /home. But what
> is the file name?

There's *no* easy way to find out.  You'll have to grovel through all
the filesystem metadata, and the layers of index blocks for every file
until you find the 'rgiht' one.