[systemd-devel] question about system reboot and shutdown

[Tilman Baumann]

On 09.08.2017 11:28, Tilman Baumann wrote:
> DL;DR
> UPS shutdowns are tricky. Clean file-systems are not the only concern.
> But if you can make assumptions about your storage backend you might be
> able to cut corners safely.
> 
> In my experience, the only place where you can hook in a non racy way is
> in the kernel.
> 
> https://unix.stackexchange.com/questions/122557/how-does-the-system-shutdown-of-a-linux-kernel-work-internally

Apologies, I copy and pasted the wrong link
https://stackoverflow.com/questions/5938325/how-do-i-detect-reboot-shutdown-from-a-linux-driver

The magic is here IIRC
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tree/kernel/reboot.c