linux-kernel - Re: [patch 00/13] vfs: add helpers to check r/o bind mounts

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Message-ID: <20080424173013.GA5882@ZenIV.linux.org.uk>
Date:	Thu, 24 Apr 2008 18:30:13 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Erez Zadok <ezk@...sunysb.edu>
Cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, dave@...ux.vnet.ibm.com,
	mhalcrow@...ibm.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 00/13] vfs: add helpers to check r/o bind mounts

On Thu, Apr 24, 2008 at 01:25:58PM -0400, Erez Zadok wrote:
> Al, any near-term plans for sb-level "want write" locking as we discussed
> briefly at LSF?  Being able to do so for copyup in unionfs will hopefully
> allow me to prevent concurrent topology changes.

That's pretty close to the top.

> the two directories that need locking.  This rename-locking protocol appears
> to be a special case of the sb-level "want write" idea, right?

Not really - that one doesn't provide any exclusion between writers and
that's what we want from rename/rename.

Take a look at Documentation/filesystems/directory-locking for details
of locking scheme...
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