linux-ext4 - Re: [PATCH 1/4] vfs: vfs-level fiemap interface

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Message-id: <20080916065126.GI3241@webber.adilger.int>
Date:	Mon, 15 Sep 2008 23:51:26 -0700
From:	Andreas Dilger <adilger@....com>
To:	Mark Fasheh <mfasheh@...e.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Theodore Tso <tytso@....EDU>,
	Anton Altaparmakov <aia21@....ac.uk>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	akpm@...uxfoundation.org
Subject: Re: [PATCH 1/4] vfs: vfs-level fiemap interface

On Sep 15, 2008  10:53 -0700, Mark Fasheh wrote:
> On Mon, Sep 15, 2008 at 10:49:48AM -0400, Christoph Hellwig wrote:
> > I agree to you (or someone elses - don't remember anymore) suggestion
> > to put in more padding so we can add fields later.  I strongly disagree
> > putting in features now that we neither have a user, nor a usecase or
> > testcase for.
> 
> So, how about another 64 bits of padding in struct fiemap_extent? That could
> help cover future uses like compression, which might require another 64 bit
> offset field - we only have 32 bits of reserved space there right now.

I'd be happy to see it.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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