Kir Kolyshkin f00e9a9036 mount.Unmount(): don't look into /proc/self/mountinfo ...

Now, every Unmount() call takes a burden to parse the whole nine yards
of /proc/self/mountinfo to figure out whether the given mount point is
mounted or not (and returns an error in case parsing fails somehow).

Instead, let's just call umount() and ignore EINVAL, which results
in the same behavior, but much better performance.

Note that EINVAL is returned from umount(2) not only in the case when
`target` is not mounted, but also for invalid flags. As the flags are
hardcoded here, it can't be the case.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: a1d095199ddb9b4811e1417b6adcdfadad7d73f4
Component: engine

2018-04-19 14:49:50 -07:00

components/engine

mount.Unmount(): don't look into /proc/self/mountinfo

2018-04-19 14:49:50 -07:00

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