Re: [PATCH bpf-next 0/5] BPF link force-detach support

Andrii Nakryiko [off-list ref] writes:

This patch set adds new BPF link operation, LINK_DETACH, allowing processes
with BPF link FD to force-detach it from respective BPF hook, similarly how
BPF link is auto-detached when such BPF hook (e.g., cgroup, net_device, netns,
etc) is removed. This facility allows admin to forcefully undo BPF link
attachment, while process that created BPF link in the first place is left
intact.

Once force-detached, BPF link stays valid in the kernel as long as there is at
least one FD open against it. It goes into defunct state, just like
auto-detached BPF link.

bpftool also got `link detach` command to allow triggering this in
non-programmatic fashion.

I know this was already merged, but just wanted to add a belated 'thanks
for adding this'!

Cc: Toke Høiland-Jørgensen <redacted>

BTW, I've noticed that you tend to drop Ccs on later versions of your
patch series (had to go and lookup v2 of this to check that it was in
fact merged). Is that intentional? :)

-Toke