linux-kernel - Re: [fuse-devel] [PATCH 01/25] VFS: move attr_kill logic from notify

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Date:	Tue, 07 Aug 2007 12:21:12 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	trond.myklebust@....uio.no
CC:	miklos@...redi.hu, jlayton@...hat.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	mikulas@...ax.karlin.mff.cuni.cz, zippel@...ux-m68k.org,
	joel.becker@...cle.com, wli@...omorphy.com, dhowells@...hat.com,
	bfennema@...con.csc.calpoly.edu
Subject: Re: [fuse-devel] [PATCH 01/25] VFS: move attr_kill logic from
	notify_change into helper function

> There's another way to deal with this in NFS and fuse, without having
> to change the API:
> 
>  - remove suid/sgid bits from i_mode, when refreshing the inode attributes
>  - store the removed bits (or the original mode)  in the fs' inode strucure
>  - in ->getattr() restore the original mode into the returned stat
> 
> This way the VFS believes, that the inode does not in fact have the
> suid/sgid bits and so won't call ->setattr() unnecessarily.

Of course this would break exec().  Oh, well.

Miklos
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