[fuse-devel] How to get the pid of the process for a fuse FS?

[Goswin v. B. <gos...@we...>]

Hi,

we are running diskless nodes with fuse-unionfs. It all works well
until you try to reboot. On reboot killall5 will kill all
processes. Unfortunaelty that means the fuse-unionfs binary gets
killed and the next read on the fuse filesytem hangs. The system can
no longer function.

As solution to the problem we thought that killall5 should
(optionally) not kill userspace filesystems. For that we want to
include the PID (PIDs? Process Group?) of the process running the
filesystem in /sys/fs/fuse/connections/<num>/pid.

Now the big question is how to get that pid? Does the fuse kernel
module already know the pid somewhere?

MfG
        Goswin