We previously enforced this for security reasons, but as Dan has
explained on several occasions, it's not very valuable there
(it's trivially easy to bypass) and it does seriously annoy folks
trying to use named volumes. Flip the default from 'on' to 'off'.
Signed-off-by: Matthew Heon <mheon@redhat.com>
Instead of getting mount options from /proc/self/mountinfo, which is
very costly to read/parse (and can even be unreliable), let's use
statfs(2) to figure out the flags we need.
[v2: move getting default options to pkg/util, make it linux-specific]
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
