On Fri, 18 Nov 2011, Kirk Strauser wrote:
On Nov 18, 2011, at 11:27 AM, Robert Bonomi wrote:
See the output of 'mount(8)' for the names of all the mounted filesystems on
your machine.
$ mount | grep proc
procfs on /proc (procfs, local)
*NOTE*WELL* that '/proc' is *not* a separate filesystem. It is merely a
_directory_ with a bunch of 'special' files in it.
I'm confused here. In what way isn't /proc a separate filesystem? It's
even called "procfs".
I just went to an 8.1 system as root and did:
umount /proc
and /proc dismounted leaving an empty directory in route. I then went
mount /proc
and /proc was mounted again, using the parameters in /etc/fstab. Surely
that means that going from / to /proc is "crossing a filesystem boundary".
To me that suggests it is a separate filesystem, and typically /proc is
filled with stuff that you wouldn't want to recurse through, so I wouldn't
think it a good candidate for special casing as non-mounted.
Daniel Feenberg
NBER
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