Re: mount existing tmpfs mounts a new tmpfs

[Isaac Dunham <ibid.ag@gmail.com>]

On Sun, Jun 21, 2015 at 10:00:51PM -0400, Phillip Susi wrote:

> Forwarding this from debian bug #772419: Run mount /run, and it mounts
> a new tmpfs over top of the existing one in /run ( even if /run isn't
> listed in /etc/fstab ), hiding the existing files.  It should say that
> it is already mounted.

Devuan Jessie, mount 2.26.2-6+devuan1, only says that /run is not in
/etc/fstab unless I use:
 mount -t tmpfs tmpfs /run

The "filesystem mounted or mountpoint busy" stuff should be from
getting errno == EBUSY; this won't happen if you use a virtual filesystem
that supports multiple instances.

*As far as I know*, the only way mount with a single argument is
able to determine the correct filesystem or mountpoint without reading
/etc/fstab is if you add the "remount" option.

HTH,
Isaac Dunham
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