Re: [PATCH][CFT] per-process namespaces for Linux

[Alexander Viro]

On Wed, 28 Feb 2001, David L. Parsley wrote:

> Alexander Viro wrote:
> > > Evil idea of the day: non-directory (even non-existant) mount points and
> > > non-directory mounts. So then "mount --bind /etc/foo /dev/bar" works.
> > 
> > Try it. It _does_ work.
> 
> Yeah, mount --bind is cool, I've been using it on one of my projects
> today.  But - maybe I'm just not thinking creatively enough - what are
> the advantages of mount --bind versus just symlinking?

1) Correctly working ".." (obviously relevant only for directories)
2) Try to create symlinks on read-only NFS mount. For bonus points, try
to do that one one client without disturbing everybody else.
3) Try to make it different for different users, for that matter.

> Also, I tried mount --bind fileone filetwo, and it fails if filetwo
> doesn't exist. ('mount point filetwo doesn't exist').  Is that supposed
> to work?  (using mount from latest redhat beta)

Nope. It does exactly what it should - changing that is a too large
can of worms I simply don't want to touch.

> BTW, pivot_root is nifty, too. ;-)

Thank Werner for that ;-)