From: David Chinner <dgc@sgi.com>
To: Sandy1 <sundeep.saini@rediffmail.com>
Cc: linux-xfs@oss.sgi.com
Subject: Re: Wrong Data Pointer-XFS File system
Date: Tue, 26 Jun 2007 09:28:17 +1000 [thread overview]
Message-ID: <20070625232817.GC31489@sgi.com> (raw)
In-Reply-To: <11246839.post@talk.nabble.com>
On Thu, Jun 21, 2007 at 11:23:35PM -0700, Sandy1 wrote:
>
> Hi,
> I am Using SuSe 10.0 with Xfs file system. I am working on a File system
> based project. During the initial research in On disk layout of File system
> , i found data pointer problem. I was not able to get the data location as
> per pointed by "absolute block no." in "xfs_bmbt_rec" extent pointers.
The xfs_bmbt_rec holds the address in FSB format, not DADDR format.
> When i create any file in 0th (zero`th) AG in that case i am able to reach
> on proper location by using "absolute block no." pointer.
>
> But when i create any file in 1st or in 2nd AG and so on. I never got the
> file data at the location pointed by "absolute block no.". I always found
> the file data before the the pointed address.
FSB notation is sparse representation.
> I am not getting any value in Superblock that tells me about difference in
> pointer location with actual data.
>
> This value always becomes multiple of the AG number.
>
> Please help to get out from this problem.
>
> Is there any other calculation for finding the data locations.
man xfs_db. Search for "convert".
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
next prev parent reply other threads:[~2007-06-25 23:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-22 6:23 Wrong Data Pointer-XFS File system Sandy1
2007-06-25 23:28 ` David Chinner [this message]
2007-06-26 14:10 ` Sandy1
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