linux-kernel - Re: [PATCH 0/7] Permit filesystem local caching and NFS superblock sharing [try #13]

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Date:	Wed, 06 Sep 2006 12:58:38 +0800
From:	Ian Kent <raven@...maw.net>
To:	David Howells <dhowells@...hat.com>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	Andrew Morton <akpm@...l.org>, torvalds@...l.org,
	steved@...hat.com, linux-fsdevel@...r.kernel.org,
	linux-cachefs@...hat.com, nfsv4@...ux-nfs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] Permit filesystem local caching and NFS superblock
	sharing [try #13]

On Tue, 2006-09-05 at 14:38 +0100, David Howells wrote:
> Ian Kent <raven@...maw.net> wrote:
> 
> > > Okay, I suppose.  But that still doesn't seem to deal with the case of
> > > creating a directory on the client that then overlays a symlink on the
> > > server that you can't yet access.
> > 
> > We're largely performing user space actions at this point.
> > Wouldn't the subsequent call to mount(8) catch that?
> 
> Not if you've already caused the NFS filesystem to create a "dummy" dentry
> that's a directory because you couldn't see that what that name corresponds to
> on the server is actually a symlink.

Shouldn't stat tell me if this is a symlink?

> 
> > > You may also get ENOENT because you stat a symlink, though you'll get EEXIST
> > > from mkdir, even if there's nothing at the far end.
> > 
> > Don't think this is something I need to care about either.
> > I can't mount on a symlink so the error return would be the correct way
> > to deal with it.
> 
> But you might have to transit a symlink to reach the mountpoint.

Mmmm ... thinking ....

Ian


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