Arnd Bergmann:
quoted text
> Any writes should always just go to the top level. If the source file
> for link() exists on the top level, link should succeed even if a target
> exists on a lower level (given that the user has permissions to
> unlink that file), but should return EXDEV if the source comes from
> a lower level.

Then what will happen when a user builds a union by "empty tmpfs" +
"cramfs"? Following your design, link(2) becomes useless in stacking fs.

You may be considering to implement a new dynamic link library for
stacking.
Hmm, that is intersting. It may be worth to think.


Junjiro Okajima
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