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This adds symlinks that allow accessing loopback block devices via stable names that reference their backing block devices, make the unpredictable naming of loopback devices less of an issue. Example: 1. Create a loopback block device for a file $F losetup --find $F 2. Reference the backing block device via its inode: L="$(stat -c '/dev/loop/by-inode/%Hd:%Ld-%i' $F)" fdisk $L In the above the loop device name (which might be /dev/loop47 or any other name) is not used at all.
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.