no need for scram to be a c program and duplicate the acpi shutdown code.
try writing power off to /dev/pmctl or fall back to the new -H flag
for aux/acpi.
MNT Reform's power rails are switched off abruptly on shutdown
which causes an "unsafe" shutdown on nvme. This may result in
loss of valid data in the volatile write cache, which is never
going to be synced in this case. This problem has been reported
on forums about Linux too, including actual filesystem errors
resulting from that behavior.
Notify nvme about a shutdown and wait up to 3s before disabling
the controller. This resulted in "unsafe shutdowns" nvme's counter
to never increase on fshalt.
reboot(1) doesn't shut down the file system gracefully,
and fshalt -r didn't support passing a kernel; this
change allows rebooting into a new kernel with fshalt.
cwfs and hjfs create ther /srv command files with
ORCLOSE flag, so they get removed once the fileserver
terminates. we can use this to check that the fileserver
has in fact finished halting without making assumtions
about the time it should maximally take for any fileserver
to write out its buffers to disk.
