linux-kernel - Re: [PATCH 00/74] Union mounts version something or other

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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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