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This lock-while-mounted behaviour is similar to what QEMU does, and can help avoid duplicate mounts. Allowing for an explicit lock path that differs from the filesystem image / block device path was intentional, to ensure non-flock supporting filesystems can still be used. Also, there are cases where a block device and partition (e.g. sda and sda1) can both provide access to the same filesystem image, in which case an FS-ID based lock would make sense. Signed-off-by: David Disseldorp <ddiss@suse.de>