On Tue, May 23, 2017, at 11:31 AM, Jeff Layton wrote: > > nfsdcltrack was originally nfsdcld, a long running daemon that used > rpc_pipefs to talk to the kernel. That meant that you had to make sure > it gets enabled by systemd (or sysvinit, etc). If it dies, then you also > want to ensure that it gets restarted lest the kernel server hang, > etc... > > It was pretty universally hated, as it was just one more daemon that you > needed to run to work a proper nfs server. So, I was encouraged to > switch it to a call_usermodehelper upcall and since then it has just > worked, as long as the binary is installed. Note that with the "read()/write() fd" model you don't need a whole process just to do that...the functionality could be rolled into systemd or equivalent easily enough. > "You're doing it wrong. You just need to run all of these services as > long-running daemons." Also, I imagine we could figure out a clean model to do *activation* from kernel -> userspace too. systemd's socket activation model where pid 1 activates units on demand is quite nice and obviates the need to configure things on in advance.
