why can't i see *all* mounts with "mount"?

[Robert P. J. Day]

On Fri, 7 Mar 2008, Stephen Smalley wrote:

>
> On Fri, 2008-03-07 at 10:43 -0500, Robert P. J. Day wrote:
> > i'm curious as to why the "mount" command won't show me all the
> > mounts that i can view via /proc/mounts.  for example, "mount" doesn't
> > show me the usbfs mount, or the selinuxfs mount, or ... well, you get
> > the idea.
> >
> >   were these mount types left out of the output of mount for a reason?
> > just curious.
>
> mount uses /etc/mtab as its source of information, not /proc/mounts,
> which means that only mounts that were performed using the mount command
> are reported by it.
>
> selinuxfs is mounted directly by init in order to load policy into the
> kernel.  Doesn't go through mount(8).

ah, it is now clear, thanks.

rday
--

========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry:
    Have classroom, will lecture.

http://crashcourse.ca                          Waterloo, Ontario, CANADA
========================================================================