Re: [PATCH 1/3] copyfile: generic_sendpage

[Christoph Hellwig]

On Sat, Sep 04, 2004 at 07:22:23PM +0200, Jörn Engel wrote:
> On Sat, 4 September 2004 18:12:20 +0100, Christoph Hellwig wrote:
> > 
> > > o unionmount - you might remember Jan Blunck's fix to ext3
> > 
> > Could you give some context please?
> 
> Trivial example union mount:
> 
> Top layer:	<empty>
> 2nd layer:	foo
> 
> Writes to foo have to be done in the top layer, so foo has to be
> copied up first.  And since that has to be done inside the kernel,
> any possible implementation will be similar to my code.
> 
> For further details on unionmount, you should ask Jan directly.  But
> for politeness' sake, please wait a month or two, so he can focus on
> his university exams before getting into the flamewars. ;)

Oh, I know what union mounts are.  But I wonder who's hacking on them
as they need some major VFS surgey to get right.

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