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Message-ID: <8873.1303391374@redhat.com>
Date: Thu, 21 Apr 2011 14:09:34 +0100
From: David Howells <dhowells@...hat.com>
To: Valerie Aurora <valerie.aurora@...il.com>
Cc: dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: [PATCH 00/74] Union mounts version something or other
Valerie Aurora <valerie.aurora@...il.com> wrote:
> That's never up to date, but I just fixed it. The branch you want is
> "ext2_cleanup". Any branch with "+" at the front is a mistake from
> trying to do a git push of a rebased branch. I deleted it.
Okay, I've got that pulled up to Linus's head branch. I've mostly got the RCU
pathwalk and managed dentry stuff correctly entangled.
However, I have a few questions:
(1) Is it meant to be possible to unionmount over a mount tree rather than
just a single mount? I ask because do_lookup_union() calls
__follow_mount().
(2) When you open a file that exists in the lower layer but not the top
layer, am I right in thinking that f_path points to the lower layer file?
(3) If I'm correct in (2), I presume something must intercept fchown() and
suchlike?
(4) I presume IS_DIR_UNIONED() only gives true on the upper layer (the one
that was mounted -o union)?
David
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