linux-kernel - Re: [PATCH 0/4] add killattr inode operation to allow filesystems to interpret ATTR_KILL

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Message-ID: <20070828193125.GA27309@filer.fsl.cs.sunysb.edu>
Date:	Tue, 28 Aug 2007 15:31:26 -0400
From:	Josef Sipek <jsipek@....cs.sunysb.edu>
To:	Christoph Hellwig <hch@...radead.org>,
	Jeff Layton <jlayton@...hat.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-cifs-client@...ts.samba.org,
	nfs@...ts.sourceforge.net
Subject: Re: [PATCH 0/4] add killattr inode operation to allow filesystems
	to interpret ATTR_KILL_S*ID bits

On Tue, Aug 28, 2007 at 08:11:14PM +0100, Christoph Hellwig wrote:
> 
> Sorry for not replying to the previsious revisions, but I've been out
> for on vacation.
> 
> I can't say I like this version.  Now we've got callouts at two rather close
> levels which is not very nice from the interface POV.
> 
> Maybe preference is for the first scheme where we simply move interpreation
> of the ATTR_KILL_SUID/ATTR_KILL_SGID into the setattr routine and provide
> a nice helper for the normal filesystem to use.
> 
> If people are really concerned about adding two lines of code to the
> handfull of setattr operation there's a variant of this scheme that can
> avoid it:
 
It's not about adding 2 lines of code - it's about adding the requirement
for the fs to call a function.

>  - notify_change is modified to not clear the ATTR_KILL_SUID/ATTR_KILL_SGID
>    but update ia_mode and the ia_valid flag to include ATTR_MODE.
>  - disk filesystems stay unchanged and never look at
>    ATTR_KILL_SUID/ATTR_KILL_SGID, but nfs can check for it and ignore
>    the ATTR_MODE flags and ia_valid in this case and do the right thing
>    on the server side.

Sounds reasonable.

Josef 'Jeff' Sipek.

-- 
I abhor a system designed for the "user", if that word is a coded pejorative
meaning "stupid and unsophisticated."
		- Ken Thompson
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