First 128KB of XFS partition is NULL.

[Dave Chinner]

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 2.6.30.9 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...

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com