linux-kernel - Re: [PATCH] Introduce vfs

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Message-ID: <20061009204213.GZ29920@ftp.linux.org.uk>
Date:	Mon, 9 Oct 2006 21:42:13 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Andrew Morton <akpm@...l.org>
Cc:	Josef Sipek <jsipek@....cs.sunysb.edu>,
	linux-kernel@...r.kernel.org, notting@...hat.com,
	torvalds@...l.org, hch@...radead.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] Introduce vfs_listxattr

On Mon, Oct 09, 2006 at 01:33:32PM -0700, Andrew Morton wrote:
> On Mon, 9 Oct 2006 16:10:48 -0400
> Josef Sipek <jsipek@....cs.sunysb.edu> wrote:
> 
> > This patch moves code out of fs/xattr.c:listxattr into a new function -
> > vfs_listxattr. The code for vfs_listxattr was originally submitted by Bill
> > Nottingham <notting@...hat.com> to Unionfs.
> 
> That tells us what the patch does.  In general, please be sure to also tell
> us *why* you prepared a patch.
> 
> Does this patch allow unionfs to be loaded into an otherwise unpatched
> kernel.org kernel?  If so, that seems to be a good reason for including
> this patch into the mainline kernel.

Generally I'd say that it makes sense.  Anything that wants to
access the method in question would either have to play with
set_fs() or open-code it; neither is good.

It makes sense to localize calls of a method when we have pretty
much mandatory framing for it (security_... stuff).

So the only question is whether it makes sense for anything other
than syscall itself to access the method in question.  AFAICS,
the answer's yes...
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