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

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Message-ID: <20080324085442.GB4845@infradead.org>
Date:	Mon, 24 Mar 2008 04:54:42 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Ram Pai <linuxram@...ibm.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	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 Mon, Mar 24, 2008 at 01:50:14AM -0700, Ram Pai wrote:
> 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.

No such thing like dmapi near mainline, and we ever want user-space
assiseted HDM in mainline we'd do it in VFS.

FYI: SGI out of tree dmapi doesn't make use of ->unmount_begin either.

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