linux-ext4 - Re: e4defrag and immutable files

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Message-ID: <4C06083B.7050102@zytor.com>
Date:	Wed, 02 Jun 2010 00:28:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	tytso@....edu
CC:	Sunil Mushran <sunil.mushran@...cle.com>,
	linux-ext4@...r.kernel.org, Joel Becker <Joel.Becker@...cle.com>,
	Mark Fasheh <mfasheh@...e.com>
Subject: Re: e4defrag and immutable files

On 06/01/2010 12:49 PM, 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.
>

For what it's worth, this sort of seems to be what one would expect if a 
file is *both* "fixed" and "immutable".

	-hpa

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