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There is no need to perform a separate losetup step; mount (even the one in busybox!) is smart enough to set up a loopback device all by itself (even without -o loop present!). More to say, while doing this, it sets LO_FLAGS_AUTOCLEAR flag for the kernel to delete the loopback device as soon as its fs is unmounted (this is supposed to work since kernel 2.6.25). Also, remove mount options (-t ext4, -o loop,rw) as they are either defaults (rw) or mount is smart enough to figure out. Leave -n so it won't do unnecessary write to container's /etc/mtab. While at it, touch up some comments. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> Upstream-commit: a978fd22daefcc68d37c46177a545f7e1dfc6d9e Component: engine