ovl: unprivieged mounts
Enable unprivileged user namespace mounts of overlayfs. Overlayfs's
permission model (*) ensures that the mounter itself cannot gain additional
privileges by the act of creating an overlayfs mount.
This feature request is coming from the "rootless" container crowd.
(*) Documentation/filesystems/overlayfs.txt#Permission model
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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