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SubjectRe: [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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