linux-kernel - Re: [RFC][PATCH 3/6] SLIM main patch

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Date:	Fri, 14 Jul 2006 16:51:13 -0400
From:	David Safford <safford@...son.ibm.com>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	Kylene Jo Hall <kjhall@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	LSM ML <linux-security-module@...r.kernel.org>,
	Dave Safford <safford@...ibm.com>,
	Mimi Zohar <zohar@...ibm.com>, Serge Hallyn <sergeh@...ibm.com>
Subject: Re: [RFC][PATCH 3/6] SLIM main patch

On Fri, 2006-07-14 at 12:34 -0700, Dave Hansen wrote:
> On Fri, 2006-07-14 at 12:25 -0700, Kylene Jo Hall wrote:
> > > inode_supports_xaddr()?  Seems like something that should check a
> > > superblock flag or something.
> > 
> > I don't know of any such flags.
> 
> There probably aren't any.  The superblock may not even be the right
> place for it.  It just seems a bit silly to say that the only files in
> the system that don't support xaddrs are device files and /proc.  What
> about all of the other filesystems?  Have you tested things like
> ISO9660, VFAT, sysfs?

is_exempt() is just a quick test to speed up a couple of obvious cases. 
It does not need to be complete, as the subsequent get_level() will handle
all other cases where xattrs are not supported....

dave

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