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Re: Quota: another DAV:quota-assigned-bytes question

From: Julian Reschke <julian.reschke@gmx.de>
Date: Wed, 08 Sep 2004 08:23:18 +0200
Message-ID: <413EA556.9090400@gmx.de>
To: Jim Luther <luther.j@apple.com>
CC: w3c-dist-auth@w3.org

Jim Luther wrote:

> After reading all of these arguments, my input is "It's too bad the  
> term "quota" was chosen in the first place."
> The Mac OS X WebDAV file system does not support Unix-like file system  
> quotas.
> The Mac OS X WebDAV file system uses the old quota properties* to fill  
> in the f_blocks (total data blocks in filesystem) and f_bfree (free  
> blocks in filesystem) fields returned by statfs(2).  In the Mac OS X  
> user interface, those fields become the Capacity, Available, and Used  
> numbers displayed in volume information dialogs (as in "Capacity:  
> 100MB" "Available: 49.2 MB" "Used: 50.8 MB on disk").
> On Apple's .Mac iDisk WebDAV server, if a client PUT request would  
> cause a user's purchased space to be exceeded, the server returns 507  
> Insufficient Storage and the WebDAV file system translates that to  
> ENOSPC "No space left on device" (not to EDQUOT "Disc quota exceeded").
> For our purposes, the quota properties are considered live properties  
> which cannot be changed by the file system client.
> So, we're using the old quota properties in a way that compatible with  
> a common industry model... it just isn't the model many on this list  
> are associating with the term "quota".
> - Jim


thanks for the information.

I think the best (if not only way) to make progress is to focus what 
parts actually *need* to be standardized.

As far as I can tell, people want their clients to display a 
available/free/used-by-this item indicator in their client. They may or 
may not care whether this is due to disk limits or quota. They also 
expect usable error messages.

I do *not* see anybody asking for

- authorable quota settings (there's only one server implementing that 
right now) and
- there is certainly no demand whatsoever to restrict this to one 
specific system of computing quota.

So let's please focus on what aspects need to be standardized for 
interoperability, and which don't. Remove those that don't, and I'm sure 
we can make quick progress.

Best regards, Julian

<green/>bytes GmbH -- http://www.greenbytes.de -- tel:+492512807760
Received on Wednesday, 8 September 2004 06:24:00 UTC

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