Re: Unionfs, looking up links and translators

[Thomas Bushnell, BSG]

Moritz Schulte <moritz@duesseldorf.ccc.de> writes:

> After I did the O_NOTRANS lookup in unionfs, I check if the resulting
> node is the same as the one returned by netfs_startup.  If it is, I
> return ELOOP to make it impossible to reach the unionfs inside of the
> unionfs again, which would lead to infinite recursion.  If it is not,
> the lookup process continues (i.e.: returning retry information to the
> user).

That's actually not a problem, because each walk through the union fs
requires a retry.  The library is supposed to keep track of how many
retries it gets, and handle ELOOP itself.