> >it's wrong because our name cache is optional.
> >ie. a filesystem is free to choose not to use it at all.
> >please revert.
> 
> If the filesystem does not implement it, it fails with an error.
> Actually I have a good idea how to deal with the failure in the
> procfs "exe" case.

then, what's a problem with just failing always and deal with it?

> >(besides, i don't think it works as linux procfs expects,
> >because there entries are not pinned.)
> 
> I think it is good enough for the purpose required
> (to find any path to the vnode requested).

i'm not sure what you mean.
if name cache entries are not required for your purpose,
there is no point to enter it in the first place, isn't it?

> >if vnode -> name translation is really necessary, it should be
> >implemented in upper layers.  (caller of VOPs, not filesystems.)
> 
> how? can you please elaborate?

something similar to what linux and dragonflybsd do.

YAMAMOTO Takashi