linux-ext4 - Re: [PATCH] fiemap support for ext3

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Message-ID: <20080424124644.GC25173@unused.rdu.redhat.com>
Date:	Thu, 24 Apr 2008 08:46:44 -0400
From:	Josef Bacik <jbacik@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Josef Bacik <jbacik@...hat.com>, Andreas Dilger <adilger@....com>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] fiemap support for ext3

On Thu, Apr 24, 2008 at 07:52:12AM -0500, Eric Sandeen wrote:
> Josef Bacik wrote:
> > On Wed, Apr 23, 2008 at 08:58:03PM -0600, Andreas Dilger wrote:
> >> On Apr 23, 2008  15:39 -0400, Josef Bacik wrote:
> >>> Here is my reworked fiemap patch for ext3.  The generic fiemap handler
> >>> takes the get_block_t from the filesystem and does the fiemap that way,
> >>> so then adding ext2 support should be a snap, as well as any other fs
> >>> that wants to use this.
> >> Ah, one other point is that this should also be used by ext4 to map inodes
> >> that are not in extents format, replacing the -EOPNOTSUPP return in that
> >> case.
> >>
> > 
> > Sounds good, but I'm wondering if we should add a flag to the FIEMAP stuff to
> > specify wether the inode you are mapping does truly have extents or if its just
> > more of a block map.  Do you think something like that would be usefull?  Thank
> > you,
> > 
> > Josef 
> 
> I don't see that in itself as useful; you care about file layout, but
> why would you care about the filesystem's mechanism for tracking that
> layout?
>

idk, just thought it may be usefull in the case of ext4 where you potentially
have both formats.  Mostly thinking out loud while we can still change things.
Thanks,

Josef 
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