On Mon, 2007-01-08 at 13:29 -0800, Andrew Morton wrote:
> On Sun, 7 Jan 2007 23:12:57 -0500
> "Josef 'Jeff' Sipek" <[email protected]> wrote:
>
> > From: Josef "Jeff" Sipek <[email protected]>
> >
> > This patch contains the functions used to perform copyup operations in unionfs.
>
> What is a copyup operation and why does it exist?
>
> It seems to be copying the entire contents of certain files. That's not a
> thing I'd have expected to see in a union filesystem. Explain it all,
> please? (Somewhere where the info will be retained for posterity - a
> random email is good, but not sufficient...)
to do the random e-mail, it's because it just doesn't union
"directories", but lets you assign read-write, read-only properties to
them.
If you try to modify a file on a read-only layer, it will be copied to
the top most layer (has to be read-write) and then modified. It can be
slow though (imagine modifying a 1GB file).
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