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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>
Files in this directory contain configuration for systemd-udevd.service, a daemon that manages symlinks to device nodes, permissions of devices nodes, emits device events for userspace, and renames network interfaces. See man:udev(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of service itself. Use 'systemd-analyze cat-config udev/rules.d' to display the effective config.