linux-kernel - Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]

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Message-ID: <20100816180450.GA7764@fieldses.org>
Date:	Mon, 16 Aug 2010 14:04:50 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Jeremy Allison <jra@...ba.org>
Cc:	Jan Engelhardt <jengelh@...ozas.de>,
	Jeff Layton <jlayton@...hat.com>, Neil Brown <neilb@...e.de>,
	utz lehmann <lkml123@...4n2c.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Volker.Lendecke@...net.de, David Howells <dhowells@...hat.com>,
	linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, linux-fsde@...per.es
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make
 extended file stats available [ver #6]

On Fri, Aug 13, 2010 at 12:19:00PM -0700, Jeremy Allison wrote:
> On Fri, Aug 13, 2010 at 09:06:28PM +0200, Jan Engelhardt wrote:
> > 
> > On Friday 2010-08-13 19:54, Jeremy Allison wrote:
> > >On Fri, Aug 13, 2010 at 08:54:32AM -0400, J. Bruce Fields wrote:
> > >> On Sun, Aug 08, 2010 at 06:05:01AM -0700, Jeremy Allison wrote:
> > >> > We don't need to ape Windows in everything.
> > >> > The coming ACL disaster will show that (we will go from an ACL
> > >> > model that is slightly too complex to use, to one that is impossibly
> > >> > complex to use :-).
> > >> 
> > >> Care to elaborate?
> > >
> > >POSIX ACLs -> RichACLs (NT-style). Not criticising Andreas here,
> > >people are asking for this. But Windows ACLs are a nightmare
> > >beyond human comprehension :-). In the "too complex to be
> > >usable" camp.
> > 
> > Well, for one, ACLs in NT can be recursive IIRC. You can't say that of Linux
> > ACLs - instead you have to setfacl -R and setfacl -Rd to give one user access
> > to a directory and all its subdirs including future new inodes.
> 
> You do realize that Windows does exactly the same thing under
> the covers, right ? Watch SMB or SMB2 traffic between a client
> and Windows server when someone changes an ACL sometime :-).

Yeah.  There's some explanation here:

	http://tools.ietf.org/search/rfc5661#section-6.4.3.2

What NT-style ACLs provide is a few bits that help a setfacl-like
application decide how to propagate the change.  But it's still up to
the application to do the recursive traversal.

--b.
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