linux-kernel - Re: [patch 01/10] vfs: add path_create() and path

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Message-ID: <20080402223637.GQ9785@ZenIV.linux.org.uk>
Date:	Wed, 2 Apr 2008 23:36:37 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	dave@...ux.vnet.ibm.com, ezk@...sunysb.edu,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 01/10] vfs: add path_create() and path_mknod()

On Wed, Apr 02, 2008 at 06:21:30PM -0400, Trond Myklebust wrote:
> On Wed, 2008-04-02 at 22:48 +0100, Al Viro wrote:
> > I disagree.  First of all, clear separation between operations on
> > _filesystem_, which should all be namespace-agnostic and things
> > that depend on vfsmount is a Good Thing(tm).  Think of that as
> > of separation between server (superblock and everything related
> > to it, starting with dentry tree) and clients; mixing those is a
> > bloody bad idea.
> 
> Speaking of which: is there any reason why we can't get rid of the
> vfsmount reference in struct file?
> 
> Most file operations, don't involve namespace traversal at all: aside
> from fchdir(), and the *at() functions (all of which take file
> descriptors, not pointers to struct file) the only function of that
> vfsmount reference appears to be to prevent the superblock from going
> away.

Huh?  Are you proposing to move that to descriptor table, of all things?
Not to mention SCM_RIGHTS datagrams and hell knows what else...
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