linux-ext4 - Re: e4defrag and immutable files

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Message-ID: <4C0574DF.3030303@redhat.com>
Date:	Tue, 01 Jun 2010 16:00:15 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	tytso@....edu
CC:	Sunil Mushran <sunil.mushran@...cle.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-ext4@...r.kernel.org,
	Joel Becker <Joel.Becker@...cle.com>,
	Mark Fasheh <mfasheh@...e.com>
Subject: Re: e4defrag and immutable files

tytso@....edu wrote:
> On Tue, Jun 01, 2010 at 12:32:29PM -0700, Sunil Mushran wrote:
>> We (ocfs2) are looking to add a new attribute to denote files that
>> have a fixed allocation on disk. But at the same time, allow writes
>> that do not change the allocation on disk. No truncating, extending,
>> filling holes, etc. We were thinking of calling it "Static" files.
> 
> That's an interesting set of semantics, and it might make sense to
> conflate that with a local disk "don't move or defrag" the file
> option.  I'm not crazy with the name "static", since it could mean a
> number of other things in other contexts, but I admit I can't think of
> a better name.
> 
> 					- Ted

fixed-mapping files maybe?  

-Eric
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