RE: Loopback (dir->dir) mounting (NOT -o loop)

From: Chemolli Francesco (USI) (
Date: Mon Jun 05 2000 - 02:15:00 EST

> > For most uses, the illusion of multiple mounts is provided
> very nicely
> > by symbolic links. It works, and programs which should not
> be confused
> > can make a point of not following links. For example a program that
> > does "rm -rf" in /tmp.
> >
> > So what use is mount -t bind?
> >
> > One use is to hide the fact that anything is linked. This
> it does very
> > well. Disturbingly well :-) I don't know of a legitimate
> use for this
> > though.
> >
> There is plenty -- the chief one is to provide the same namespace on a
> whole collection of machines. autofs currently uses symlinks (well,
> 3.1.5 supports mount -t bind) and it is a neverending source of
> complaints.

Another I can think of is to allow for a smaller (and maybe readonly)
root filesystem: just bind-mount /var/tmp over /tmp...
Yes, it could be done with symlinks, but this is cuter :-)


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