How do I force the order of things at shutdown with systemd

[bedna]

I had a thread about this earlier and the sollution I “found” was to create my own systemd service where I used PartOf to bind it to the systemd mount unit.
That no longer works and I finally figuered out exactly why it happens sometimes and sometimes not. Because of the order of how things are done at shutdown/reboot.
I have now removed the systemd unit and is relying on the default installed one at /usr/lib/systemd/system/smb.service

My samba server is only sharing things from one partition, and that partition is mounted with systemd.

So I sometimes see this in the shudown log.

$ sudo journalctl -b -1 --no-pager | grep -ie smbd -e fil-fitt
--------------- cut for unnecessary info ----------------
Dec 29 12:39:31 bednaManjaro systemd[1]: Unmounting File drive (fil-fitt)...
Dec 29 12:39:31 bednaManjaro smbd[1045]: [2023/12/29 12:39:31.631014,  0] ../../source3/smbd/smb2_service.c:117(chdir_current_service)
Dec 29 12:39:31 bednaManjaro smbd[1045]:   chdir_current_service: vfs_ChDir(/media/fil-fitt/divprogs/Raspberry Pi) failed: No such file or directory. Current token: uid=1000, gid=1000, 10 groups: 1000 998 991 3 50 90 98 117 962 1001
--------------- cut for unnecessary info ----------------

Witch makes sense since the partition is already unmounted.

So my question is: How do I force smb.service to exit BEFORE the partition media-fil\\x2dfitt.mount gets umounted?

[Mirdarthos]

Hi @bedna,

Perhaps this helps

https://serverfault.com/a/785355

And

https://unix.stackexchange.com/questions/466645/how-to-synchronize-systemd-stop-order-from-one-service

Hope it does!

[bedna]

OMFG, I was under the assumption that was controlling the STARTING order of the service.
I’m off to do some testing. Thanks!

I’ll come back with info if it works.

[Mirdarthos]

According to the last link I sent:

See the documentation for After= in man systemd.unit, which states:

Note that when two units with an ordering dependency between them are shut down, the inverse of the start-up order is applied. i.e. if a unit is configured with After= on another unit, the former is stopped before the latter if both are shut down.

[bedna]

I HAD After=network.target network-online.target nmb.service winbind.service media-fil\\x2dfitt.mount in the smb.service I had active before so it is strange that it did not work. Maybe the PartOf made it wrong.

I opted to keep the default smb.service file and added: Before=smb.service to my mount unit instead and it now works as intended.
Thanks! <3

Full mount unit file for reference:

$ cat /etc/systemd/system/media-fil\\x2dfitt.mount
[Unit]
Description=File drive (fil-fitt)
Before=smb.service

[Mount]
What=/dev/disk/by-uuid/01051f95-9283-4ce9-acfd-403dfa8252b9
Where=/media/fil-fitt
Type=btrfs
Options=defaults,dev,async,noatime,discard=async,nossd,compress=zstd:10
TimeoutSec=15

[Install]
WantedBy=multi-user.target