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Re: First 128KB of XFS partition is NULL.

To: Ajeet Yadav <ajeet.yadav.77@xxxxxxxxx>
Subject: Re: First 128KB of XFS partition is NULL.
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Mon, 21 Feb 2011 08:32:05 +1100
Cc: xfs@xxxxxxxxxxx
In-reply-to: <AANLkTindiB_D7shZKkrdkePM=xaAXCe1HAX5tPy87SCy@xxxxxxxxxxxxxx>
References: <AANLkTindiB_D7shZKkrdkePM=xaAXCe1HAX5tPy87SCy@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Sun, Feb 20, 2011 at 11:22:34AM +0900, Ajeet Yadav wrote:
> Dear All,
> I have received a corrupted disk from team testing XFS, when I look
> hexdump of partiton. Its 0000 in first 128KB.
> Our kernel is however we have backported XFS from 2.6.34,
> Arch MIP with VIPT cache.
> This arch previously had many issues but after properly implementing
> "xfs: fix xfs to work with Virtually Indexed architectures " most
> problem resolved.
> Can anyone make guess in what case first 128KB may become NULL, I seem
> to be impossible because file system does not modify all 128KB at the
> begining of partition at once.

Something else wrote to the block device. Maybe a partitioning
program, a boot loader or possibly something else entirely...


Dave Chinner

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