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Previously, if the priority is same, devlinks are always replaced by newer events. The commit 331aa7aa15ee5dd12b369b276f575d521435eb52 changes that to keep the existing devlink. That should not change any behavior when the devices that request the same symlink do not have any dependency, e.g. when /dev/sda1 and /dev/adb1 request the same /dev/disk/by-label symlink, as there are no guarantee that which device is processed first. However, when devices has dependency, e.g. /dev/sda and /dev/sda1 request the same /dev/disk/by-label symlink, previously the symlink always pointed to the partition, as the partition is always processed later. But, 331aa7aa15ee5dd12b369b276f575d521435eb52 makes the symlink point to the whole disk. The change by 331aa7aa15ee5dd12b369b276f575d521435eb52 is crucial to improve performance of devlink handling, especially when a system has large number of disks with same label or so. Hence, cannot and should not be reverted. So, let's workaround the case, as such situation should happen only when the disk is a hybrind ISO image, I guess. Fixes #28468.
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.