d8a625875c
probe_gpt_boot_disk_needs_loop() sets ID_PART_GPT_AUTO_ROOT_DISK_NEEDS_LOOP for any whole disk that holds the boot ESP/XBOOTLDR but whose partition table the kernel cannot parse. Until now the udev rule turned that into a systemd-loop@.service for every block device. That is too broad: device-mapper devices also report kernel partition scanning as disabled, but their partitions are managed in userspace by kpartx (see 66-kpartx.rules). Setting up a loop device on top of them re-exposes the same partition table a second time and only causes trouble. Restrict the rule to optical drives, the one class that genuinely needs a kernel-side loop device (El Torito GPT sector size mismatch, or drives that do not support partition scanning) and that has no userspace partition manager of its own. Co-developed-by: Claude Fable 5 <noreply@anthropic.com>
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