On 2020-07-15 11:16, Lee Duncan wrote: > SCST is still around, but I believe it's user-space only. (Forgive me if > I'm wrong here, but it's been a while since I looked at SCST.) Hi Lee, That may be a misunderstanding :-) Almost all of SCST runs in the kernel, except the code for accepting connections from an iSCSI initiator. The SCST configuration tool (scstadmin) is a user space tool that interacts with the SCST kernel modules through the SCST sysfs interface. SCST still has a significant user base despite not being upstream. > There is also a cool new extension to targetcli called tcmu-runner, that > allows you to add new functionality to targetcli without having to hack > on the kernel. My understanding is that the design of tcmu-runner is strongly inspired by the design of the scst_user driver. Something that's unfortunate is that we can't ask Shaohua Li anymore about the design of tcmu-runner (see also https://lore.kernel.org/lkml/398a74fa-6566-8d0d-6434-e68ff3763656@xxxxxxxxx/). Bart.
