Subject: Re: user-land file systems
To: None <>
From: Wolfgang Solfrank <>
List: tech-kern
Date: 06/17/1995 14:01:28
> 5. news or mail (e.g. each article is file, news hierarchy is directory hier)

??? This is the organization of the news spool since day one.

> This would require several generalizations; I'd like to see a non-root
> mount with the necessary restrictions (nosuid, noexec, whatever)
> (although from reading Bugtraq, I gather you have to be -real- careful.
>  I'd suggest making sure the user owned the mount point, not just checking
>  for r/w/no-suid access on it.) (nosuid because you don't want someone
> mounting over /tmp, for example - one case where it's not always obvious)

NetBSD has had user mounts since shortly after the 1.0 release (with all
the necessary restrictions, of course).

> Also, I'd like to see some kind of callback into user space (daemons?) to
> handle userland debugging of filesystems.  I know they'd be slower, but they'd
> be less like to crash your system (and easier to debug), and there really
> isn't any reason IMHO why a user can't access a file of hers as a fs hierarchy
> of her own design if she really wants to.  What do you people think?

see mount_portal(8).
ws@TooLs.DE     (Wolfgang Solfrank, TooLs GmbH) 	+49-228-985800