Miklos Szeredi wrote:
> > Look up the rather large linux-kernel & linux-fsdevel thread "silent
> > semantic changes with reiser4" and it's followup threads, from last
> > year.
>
> Wow, it's 700+ messages. I got through the first 40, and already feel
> dizzy :)
It's easier if you skip the ones by Hans and their immediate followups :)
(Nothing personal, it's that Hans is mostly justifying reiser4's
behaviour, and the posts you really need to read aren't about reiser4).
> > It's already been tried. You will also find sensible ideas on what
> > semantics it should have to do it properly.
>
> OK, I understand the "slash -> directory, no-slash -> regular file"
> semantics.
>
> How do you envision implementing this for "mount directory over file"?
Somewhere deep in that thread is a discussion between Al Viro and
Linus on it.
> A new mount flag indicating that it's only to be followed down if
> there's a slash after the mountpoint?
The new flag would indicate more than that: These mounts should be
detachable in the sense that deleting the file is possible, and
perhaps renamable/linkable too. That's the stuff Al Viro discusses in
some detail in the big thread.
Ideally we'd like automounting, a bit like the Hurd's translators.
Attached to files (using an xattr or something, and executed with the
uid/gid of the file owner), and also per-user "pattern->action"
options for matching files with a certain type (e.g. tgz/zip/deb/rpm/xml).
But that can be added much later, as it's an orthogonal feature.
-- Jamie
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