Steffen Maier 9927023680 zdev/dracut: add rd.dasd cmdline option handling ...

Add parsing of dracut cmdline option "rd.dasd=..." at initrd runtime.
It delegates configuration to chzdev.

Implement `dracut --print-cmdline` and `dracut --hostonly-cmdline` for
initrd build time. Emit an rd.dasd option for each DASD disk in dracut's
device dependency graph (to mount the root-fs, or to access the kdump
target).

This allows a distribution independent device configuration.
Configuration is consistent by using chzdev as backend.
It also prevents duplicate activations of the same device.

Copy the udev rule for unique DASD device nodes under /dev/disk/
[59-dasd.rules] into initrd for the same functionality like 95dasd or
95dasd_rules.

Along with the existing functionality of zdev/dracut, it makes the
following dracut modules superfluous:
https://github.com/dracutdevs/dracut/tree/master/modules.d/95dasd
https://github.com/dracutdevs/dracut/tree/master/modules.d/95dasd_mod
https://github.com/dracutdevs/dracut/tree/master/modules.d/95dasd_rules

Github-ID: https://github.com/ibm-s390-linux/s390-tools/pull/158
Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2023-12-14 15:25:22 +01:00

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