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Re: reiser4 (was Re: [PATCH] Revised extended attributes interface)

To: Anton Altaparmakov <aia21@xxxxxxxxx>
Subject: Re: reiser4 (was Re: [PATCH] Revised extended attributes interface)
From: Hans Reiser <reiser@xxxxxxxxxxx>
Date: Wed, 12 Dec 2001 18:40:05 +0300
Cc: Anton Altaparmakov <aia21@xxxxxxxxxxxxx>, Nathan Scott <nathans@xxxxxxx>, Andreas Gruenbacher <ag@xxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxx
References: <Pine.SOL.3.96.1011212015827.2712B-100000@xxxxxxxxxxxxxxxxxxx> <5.1.0.14.2.20011212133045.02649740@xxxxxxxxxxxxxxxxx>
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Anton Altaparmakov wrote:

At 12:02 12/12/01, Hans Reiser wrote:

Anton Altaparmakov wrote:

On Wed, 12 Dec 2001, Hans Reiser wrote:

Anton Altaparmakov wrote:

Both MacOS and as of recently Windows do this kind of stuff, too, and it
can't be long before Linux goes the same way, provided file systems
support the required features (i.e. EAs and/or named streams) so I
disagree with you this is only a compatibility thing. It might start out
as one but it will find real world applications very quickly...

I am not saying that the features of EAs are not useful, I am saying that I want to choose them individually for particular files.

It could be so much better to have EDIBLE_PIZZA (example from previous email) instead of just PIZZA, sigh.


I am not quite sure what you mean. Surely you can just have all features
available at all times/to all files and then you just use the ones you
want, just ignoring/not using the rest. Why do you see the need for
"selecting features of EAs individually for particular files"? It makes
sense when buying EDIBLE_PIZZA but I don't see how that can be transferred onto files. After all I can just have all pizza ingredients and only put
the ones I want on the pizza just ignoring the others.

Inheriting stat data from the parent directory should be a feature available not just for streams, but for all files that want it. Efficient small file access to a 32 byte file should be a feature available to all files, not just EAs. Not being listed in readdir should be a feature available to all files, not just EAs. Constraining what is written to them should be a feature available to all files, not just EAs, and arbitrary plugin based constraints should be possible.

Is this more clear?


Yes it is, thanks. And yes it makes sense. But this is talking about files as a whole and has nothing to do with EAs as such (but it would obviously apply to EAs, too under your proposed API).

There would be no need for EAs if files as a whole could have these properties, as EAs would just be particular files with particular properties within a directory/file object.



I will be looking forward to seeing this stuff implemented. (-:

Anton



If Linux users get really unlucky, which seems likely, :-/, 2.6 will take as long as 2.4, in which case I think we will complete the task in plenty of time for 2.6, and we can ask Linus which implementation he prefers before he has committed to one in a stable release.

Hans


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