The canonical device name is not necessarily used in /proc/mounts or /proc/self/mountinfo, see /dev/dm-0 vs. /dev/mapper/dmroot. (And only checking by major:minor is not possible in the case of btrfs.) Also fixes another bug where e.g. dm-10 would match when really only dm-1 was mounted, or when the mountpoint path included the device name, etc. Also catches enabled swap.pull/6/head
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