Private loop devices with loopfs

A loop device is a kernel abstraction that allows a file to be presented as if it were a physical block device. The typical use for a loop device is to mount a filesystem image stored in a file. Loop devices are global and shared between users, which causes a number of problems for container workloads where the instances are expected to be isolated from each other. Christian Brauner has been working on this problem; he has posted a patch set solving it by adding a small virtual filesystem called loopfs.

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