linux-kernel - Re: [patch 3/6] vfs: mountinfo stable peer group id

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Message-Id: <1206348614.2961.21.camel@ram.us.ibm.com>
Date:	Mon, 24 Mar 2008 01:50:14 -0700
From:	Ram Pai <linuxram@...ibm.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Trond.Myklebust@...app.com, dhowells@...hat.com
Subject: Re: [patch 3/6] vfs: mountinfo stable peer group id

On Thu, 2008-03-20 at 21:43 +0000, Al Viro wrote:
> On Wed, Mar 19, 2008 at 07:37:51PM +0100, Miklos Szeredi wrote:
> 
> > > Argh...  OK, I'll try to put something together tonight, after I get some
> > > sleep - 31 hours of uptime _suck_ ;-/
> > 
> > Gosh, yes.
> 
.....snip...
> Is there any reason why we do that in ->umount_begin() and not *after*
> it, unconditionally, straight from do_umount()?  AFAICS, the only reason
> why it's done from fs-specific code is figuring out which mount-list
> should the stuff go back to, and that's both broken *and* not needed
> with sanitized locking as above.  While we are at it, I'd rather return
> ->umount_begin() to its previous prototype, TYVM - the less filesystem
> sees vfsmounts, the better off we all are...

I think that ->umount_begin also acts a hook for providing pre-umount
event notification to userspace from filesystems; something that is
required by DMAPI interface.

RP

> 
> Comments?  If nobody objects, I'm going to do that in vfs-fixes branch
> and then push to Linus...

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